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  • 701.
    Aggerstam, Madeleine
    Linnaeus University, Faculty of Arts and Humanities, Department of Cultural Sciences.
    För kunskap och kultur: En studie om folkbibliotekariers inköpsstrategier av utländsk litteratur2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor thesis’ purpose is to investigate how purchase librarians work with foreign language collection management. Since about 15% of the citizens of Sweden are born abroad or have a foreign background, the subject of investigation becomes relevant because it touches a wide user group of the public library.

    Interviews were conducted with four librarians responsible for purchasing of foreign literature. The purpose of these interviews was to investigate which underlying strategies and thoughts are used as a basis for purchasing.

    Since the library act does not include guidelines regarding the content of the foreign literature collection, how is the literature chosen and to what purpose?

    As a theoretical framework a self-developed model was used to categorize the foreign literature into its different functions. The foreign literature was divided into two main categories; entertainment reading and literature with an informative purpose.

    To display the librarians room for interpretation factor in the purchasing of literature a theory from sociology studies was applied, the theory of room for maneuver.

    The findings in this paper have revealed that literature with the purpose to entertain was prioritized in the purchasing. Even though the libraries included multicultural activities in their organization, by prioritizing the entertainment literature the library tended to deprioritize the potential integration purpose of the literature.

    The paper also revealed that the individual responsible for the purchasing was left with a large room for interpretation, which meant that one individual had the responsibility to ensure that the literature was relevant and versatile enough for the user group.

  • 702.
    Aggerstam, Madeleine
    Linnaeus University, Faculty of Arts and Humanities, Department of Film and Literature.
    Jordens poesi: Biophilia-hypotesen som ekokritisk läsning av Wordsworth, Coleridge och Keats2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 703.
    Aggoud, Rachida
    et al.
    Linnaeus University, Faculty of Business, Economics and Design, Linnaeus School of Business and Economics.
    Bourgeois, Eglantine
    Linnaeus University, Faculty of Business, Economics and Design, Linnaeus School of Business and Economics.
    The Mismanagement of Mergers and Acquisitions2012Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    In today’s business world, it appears to be impossible for companies to survive without expanding through deals that result in mergers and acquisitions. Mergers and acquisitions represent a favourable medium of growth. However, studies indicate a high rate of failure in these operations. Evidently, there are areas that are mismanaged during the course of a merger or acquisition.

     

    If organizations make a decision to go through a merger or acquisition, it is vital that they devote significant attention and resources to understand and deal with opportunities and challenges presented during its processes. Through our research we have come to identify four important aspects as integral to a successful merger and acquisition. These components: culture, synergies, leadership and politics, each independently and together when mismanaged become the source of a merger or acquisition failing.  If we are to envision the newly formed organization post a merger or acquisition as the structure, we see these four components as the pillars of this structure.  The strength or weakness of these pillars will determine the future of the newly formed organization.  At the other end of the spectrum, the very core aspects that result in success, we believe when mismanaged can spell catastrophe for the organization. However, lessons in mismanagement in these very four strategic areas can be the game changer that could possibly turn a merger and acquisition failure into success. It is only through an analytical study of the mismanagement pertinent in these four individual areas that we arrive at answers so that we may change this dominant trend of failure in mergers and acquisitions.

  • 704.
    Aghababa, Somayeh
    Linnaeus University, Faculty of Engineering and Technology, Department of Mathematics.
    Extremal dependency:The GARCH(1,1) model and an Agent based model2013Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis focuses on stochastic processes and some of their properties are investigated which are necessary to determine the tools, the extremal index and the extremogram. Both mathematical tools measure extremal dependency within random time series. Two different models are introduced and related properties are discussed. The probability function of the Agent based model is surveyed explicitly and strong stationarity is proven. Data sets for both processes are simulated and clustering of the data is investigated with two different methods. Finally an estimation of the extremogram is used to interpret dependency of extremes within the data.

  • 705.
    Aghaee, Saeed
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Random Stream Cipher2007Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Stream ciphers are counted as an important part of symmetric encryption method. Their basic idea comes from One-Time-Pad cipher using XOR operator on the plain text and the key to generate the cipher. The present work brings a new idea in symmetric encryption method, which inherits stream key generation idea from synchronous stream cipher and uses division instead of xoring. The Usage of division to combine the plain text with stream key gives numerous abilities to this method that the most important one is using random factors to produce the ciphers.

  • 706.
    Agiorgitis, Georgios
    Linnaeus University, Faculty of Technology, Department of Informatics.
    ICTs use in the public Greek Primary Schools: the teachers' experiences2017Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    Education is a sector that has the potential to become a critical area of action for the full exploitation of ICT. Educational systems of developed and developing countries have an ever-increasing tendency to apply ICT to education, in an attempt to prepare their students for the future's society. This thesis attempted to explore what kind of ICT is used in the Greek Primary Schools and develop an understanding on the relationship between the ICT and the teachers. The philosophical background is post-phenomenology and the methods chosen for collecting data for this research are policy document analysis and interviews. The empirical findings show that various ICT are being used in the classrooms of the Greek Primary Schools,  others widely and others occasionally. The research compares the legal framework revolving around ICT in Primary Schools in Greece, with the teachers' own experiences and shows that the guidelines suggested by the Greek Ministry of Education cannot be followed easily, due to economical and pedagogical reasons. It also investigates the ICT's effects on the teachers and the students through the teachers' own words and perceptions. The effects are mostly positive, there are mentioned however, some negative ones to take into consideration. Finally, the research presents a number of sectors where the participant teachers suggested there is room for improvement. By comparing the legal framework with the situation in the Primary Schools, this research adds a new perspective to the previous literature. The findings show that the current situation can be improved and the teachers' statements may trigger further research.

  • 707.
    Agiorgitis, Georgios
    et al.
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Bennani, Mohamed
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Drakoularakos, Mixalis
    Linnaeus University, Faculty of Technology, Department of Informatics.
    McConnon, Paul John
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Digital Wall: The University’s learning and information space2017Student paper other, 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A North American university is engaged in a large transformation project involving the wholeorganisation. Students, Lecturers, departments and additional questions from the shared leadership team are engaging in defining the services offered, in particular from the university library and its associated sub-services. It is an exciting time for the University as it seeks to not only define its services but also how these can be created and consumed.There are many aspects to this re-organisation and many items to be addressed. In this report,we look at the current situation at the University, as well as taking into account the aspirations of the stakeholders. We start by drawing out a Rich Picture, part of Soft System Methodology (SSM) (Checkland, 1981) which we use in order to spot opportunities that are available for further exploration. Much of the information that we use comes from material supplied by the University itself as well as interviews with the Head of Library services and Head of Library IT. We look indepth at how SSM assists in this process of evaluation through its focus on participation and how it may assist us to understand the many different perspectives collected in our research. SSM consequently assists in defining problems with solutions to any areas that have drawn our attention. Following the evaluation of collected data, discussions and our own observations, we identify that a digital wall that is being proposed for the redesigned library presents an opportunity to explore possibilities for exploitation of this technology. Further research on other digital walls such as Brisbane’s Cube (Abdi et al, 2014), and Auraria Library’s Discovery Wall(Burch, 2016) shows some of the uses that these walls have been put to and how the Institutions use them. We then use a number of models to evaluate the data that we collected on digital walls and from the North American University and analyse it in order to inform our thinking. These models can be used independently or collectively to evaluate data from different perspectives. As such we were able to look at problems and solutions from the perspective of many of the actors involved in shaping the future library services. These models and results are discussed in the report. Finally, we take our results and make a number of proposals for the North American University digital wall along with the relevant justifications at the end of this report.

  • 708. Aglietta, M
    et al.
    Alessandro, B
    Antonioli, P
    Arneodo, F
    Bergamasco, L
    Bertaina, M
    Castagnoli, C
    Castellina, A
    Chiavassa, A
    Cini, G
    Piazzoli, B D
    Di Sciascio, G
    Fulgione, W
    Galeotti, P
    Ghia, P L
    Iacovacci, M
    Mannocchi, G
    Morello, C
    Navarra, G
    Saavedra, O
    Stamerra, A
    Trinchero, G C
    Valchierotti, S
    Vallania, P
    Vernetto, S
    Vigorito, C
    Ambrosio, M
    Antolini, R
    Baldini, A
    Barbarino, G C
    Barish, B C
    Battistoni, G
    Becherini, Yvonne
    Università di Bologna, Italy ; INFN, Italy.
    Bellotti, R
    Bemporad, C
    Bernardini, P
    Bilokon, H
    Bower, C
    Brigida, M
    Bussino, S
    Cafagna, F
    Calicchio, M
    Campana, D
    Carboni, M
    Caruso, R
    Cecchini, S
    Cei, F
    Chiarella, V
    Chiarusi, T
    Choudhary, B C
    Coutu, S
    Cozzi, M
    De Cataldo, G
    Dekhissi, H
    De Marzo, C
    De Mitri, I
    Derkaoui, J
    De Vincenzi, M
    Di Credico, A
    Erriquez, O
    Favuzzi, C
    Forti, C
    Fusco, P
    Giacomelli, G
    Giannini, G
    Giglietto, N
    Giorgini, M
    Grassi, M
    Grillo, A
    Guarino, F
    Gustavino, C
    Habig, A
    Hanson, K
    Heinz, R
    Iarocci, E
    Katsavounidis, E
    Katsavounidis, I
    Kearns, E
    Kim, H
    Kyriazopoulou, S
    Lamanna, E
    Lane, C
    Levin, D S
    Lipari, P
    Longley, N P
    Longo, M J
    Loparco, F
    Maaroufi, F
    Mancarella, G
    Mandrioli, G
    Margiotta, A
    Marini, A
    Martello, D
    Marzari-Chiesa, A
    Mazziotta, M N
    Michael, D G
    Monacelli, P
    Montaruli, T
    Monteno, M
    Mufson, S
    Musser, J
    Nicolo, D
    Nolty, R
    Orth, C
    Osteria, G
    Palamara, O
    Patera, V
    Patrizii, L
    Pazzi, R
    Peck, C W
    Perrone, L
    Petrera, S
    Popa, V
    Raino, A
    Reynoldson, J
    Ronga, F
    Satriano, C
    Scapparone, E
    Scholberg, K
    Sciubba, A
    Sioli, M
    Sirri, G
    Sitta, M
    Spinelli, P
    Spinetti, M
    Spurio, M
    Steinberg, R
    Stone, J L
    Sulak, L R
    Surdo, A
    Tarle, G
    Togo, V
    Vakili, M
    Walter, C W
    Webb, R
    The cosmic ray proton, helium and CNO fluxes in the 100 TeV energy region from TeV muons and EAS atmospheric Cherenkov light observations of MACRO and EAS-TOP2004In: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 21, no 3, p. 223-240Article in journal (Refereed)
    Abstract [en]

    The primary cosmic ray (CR) proton, helium and CNO fluxes in the energy range 80-300 TeV are studied at the National Gran Sasso Laboratories by means of EAS-TOP (Campo Imperatore, 2005 m a.s.l.) and MACRO (deep underground, 3100 m w.e., the surface energy threshold for a muon reaching the detector being E-mu(th) approximate to 1.3 TeV). The measurement is based on: (a) the selection of primaries based on their energy/nucleon (i.e., with energy/nucleon sufficient to produce a muon with energy larger than 1.3 TeV) and the reconstruction of the shower geometry by means of the muons recorded by MACRO in the deep underground laboratories; (b) the detection of the associated atmospheric Cherenkov light (C.l.) signals by means of the C.l. detector of EAS-TOP. The C.l. density at core distance r > 100 m is directly related to the total primary energy E-0. Proton and helium ("p + He") and proton, helium and CNO ("p + He + CNO") primaries are thus selected at E-0 approximate to 80 TeV, and at E-0 similar or equal to 250 TeV, respectively. Their flux is measured: J(p+He)(80 TeV) = (1.8 +/- 0.4) x 10(-6) m(-1)-s(-1) sr(-1) TeV-1, and J(p+He+CNO)(250 TeV) = (1.1 +/- 0.3) x 10(-7) m(-2)-s(-1) sr(-1) TeV-1, their relative weights being J(p+He)(J(p+He+CNO)) over bar (250 TeV) = 0.78 +/- 0.17. By using the measurements of the proton spectrum obtained from the direct experiments and hadron flux data in the atmosphere, we obtain for the relative weights of the three components at 250 TeV: J(p) : J(He) : J(CNO) = (0.20 +/- 0.08) : (0.58 +/- 0.19) : (0.22 +/- 0.17). This corresponds to the dominance of helium over proton primaries at 100-1000 TeV, and a possible non-negligible contribution from CNO. The lateral distribution of Cherenkov light in Extensive Air Showers (EASs), which is related to the rate of energy deposit of the primary in the atmosphere, is measured for a selected proton and helium primary beam, and good agreement is found when compared with the one calculated with the CORSIKA/QGSJET simulation model. (C) 2004 Elsevier B.V. All rights reserved.

  • 709. Aglietta, M
    et al.
    Alessandro, B
    Antonioli, P
    Arneodo, F
    Bergamasco, L
    Bertaina, M
    Castagnoli, C
    Castellina, A
    Chiavassa, A
    Cini, G
    Piazzoli, B D
    Di Sicascio, G
    Fulgione, W
    Galeotti, P
    Ghia, P L
    Iacovacci, M
    Mannocchi, G
    Morello, C
    Navarra, G
    Saavedra, O
    Stamerra, A
    Trinchero, G C
    Valchierotti, S
    Vallania, P
    Vernetto, S
    Vigorito, C
    Ambrosio, M
    Antolini, R
    Baldini, A
    Barbarino, G C
    Barish, B C
    Battistoni, G
    Becherini, Yvonne
    Università di Bologna, Italy ; INFN, Italy.
    Bellotti, R
    Bemporad, C
    Bernardini, P
    Bilokon, H
    Bower, C
    Brigida, M
    Bussino, S
    Cafagna, F
    Calicchio, M
    Campana, D
    Carboni, M
    Caruso, R
    Cecchini, S
    Cei, F
    Chiarella, V
    Choudhary, B C
    Coutu, S
    Cozzi, M
    De Cataldo, G
    Dekhissi, H
    De Marzo, C
    De Mitri, I
    Derkaoui, J
    De Vincenzi, M
    Di Credico, A
    Erriquez, O
    Favuzzi, C
    Forti, C
    Fusco, P
    Giacomelli, G
    Giannini, G
    Giglietto, N
    Giorgini, M
    Grassi, M
    Grillo, A
    Guarino, F
    Gustavino, C
    Habig, A
    Hanson, K
    Heinz, R
    Iarocci, E
    Katsavounidis, E
    Katsavounidis, I
    Kearns, E
    Kim, H
    Kyriazopoulou, S
    Lamanna, E
    Lane, C
    Levin, D S
    Lipari, P
    Longley, N P
    Longo, M J
    Loparco, F
    Maaroufi, F
    Mancarella, G
    Mandrioli, G
    Margiotta, A
    Marini, A
    Martello, D
    Marzari-Chiesa, A
    Mazziotta, M N
    Michael, D G
    Monacelli, P
    Montaruli, T
    Monteno, M
    Mufson, S
    Musser, J
    Nicolo, D
    Nolty, R
    Orth, C
    Osteria, G
    Palamara, O
    Patera, V
    Patrizii, L
    Pazzi, R
    Peck, C W
    Perrone, L
    Petrera, S
    Popa, V
    Raino, A
    Reynoldson, J
    Ronga, F
    Satriano, C
    Scapparone, E
    Scholberg, K
    Sciubba, A
    Serra, P
    Sioli, M
    Sirri, G
    Sitta, M
    Spinelli, P
    Spinetti, M
    Spurio, M
    Steinberg, R
    Stone, J L
    Sulak, L R
    Surdo, A
    Tarle, G
    Togo, V
    Vakili, M
    Walter, C W
    Webb, R
    The cosmic ray primary composition between 10(15) and 10(16) eV from Extensive Air Showers electromagnetic and TeV muon data2004In: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 20, no 6, p. 641-652Article in journal (Refereed)
    Abstract [en]

    The cosmic ray primary composition in the energy range between 10(15) and 10(16) eV, i.e., around the "knee" of the primary spectrum, has been studied through the combined measurements of the EAS-TOP air shower array (2005 m a. s.l., 10(5) m(2) collecting area) and the MACRO underground detector (963 m.a.s.l., 3100 m w.e. of minimum rock overburden, 920 m(2) effective area) at the National Gran Sasso Laboratories. The used observables are the air shower size (N-c) measured by EAS-TOP and the muon number (N-mu) recorded by MACRO. The two detectors are separated on average by 1200 m of rock, and located at a respective zenith angle of about 30degrees. The energy threshold at the surface for muons reaching the MACRO depth is approximately 1.3 TeV. Such muons are produced in the early stages of the shower development and in a kinematic region quite different from the one relevant for the usual N-mu - N-e studies. The measurement leads to a primary composition becoming heavier at the knee of the primary spectrum, the knee itself resulting from the steepening of the spectrum of a primary light component (p, He) of Deltay = 0.7 +/- 0.4 at E-0 similar to 4 x 10(15) eV. The result confirms the ones reported from the observation of the low energy muons at the surface (typically in the GeV energy range), showing that the conclusions do not depend on the production region kinematics. Thus, the hadronic interaction model used (CORSIKA/QGSJET) provides consistent composition results from data related to secondaries produced in a rapidity region exceeding the central one. Such an evolution of the composition in the knee region supports the "standard" galactic acceleration/propagation models that imply rigidity dependent breaks of the different components.. and therefore breaks occurring at lower energies in the spectra of the light nuclei. (C) 2003 Elsevier B.V. All rights reserved.

  • 710.
    Agnell, Emma
    Linnaeus University, Faculty of Social Sciences, Department of Education and Teacher's Practice.
    Language choices in the EFL-classroom: The actions and perceptions of four secondary school teachers in Sweden2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The Swedish National Agency for Education encourages the exclusive use of the target language (TL) in the English language classrooms. However, one may question if this is observed, as the Swedish Schools Inspectorate, in their qualitative investigation of the Swedish schools, headlined the section on language use in their observation of English lessons in the years 6-9 as “too much English in Swedish”. They found that nearly half the lessons failed to provide sufficient opportunities for pupils’ communicative competence to develop and problematized this partly as a result of lack of pedagogical training among teachers. Nonetheless, the role of the first language (L1) in the foreign language classroom is controversial. Some favor an exclusion of the L1 while others believe the L1 has an important role. This essay problematizes four English teachers’ language choices in the classroom, with the theoretical approaches that the TL should be used extensively, but that neither teachers nor pupils should be prohibited from using the L1 as it can serve important purposes and facilitate language learning if used strategically. In this study, four English teachers were interviewed to investigate what determines their language choices. It was found that while teachers primarily based their language choices on pedagogical views and knowledge about language learning, for some the choice of language was not always strategic or pedagogical. In this study, the reasons for both their strategical and inadvertent uses are investigated. This study also investigated how the teachers perceive the pupils’ language choices, and what implications these perceptions may have.

  • 711.
    Agnell, Emma
    Linnaeus University, Faculty of Arts and Humanities, Department of Languages.
    Terminology and function hybridity: A functionalist approach to the translation of an art history book2016Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This essay discusses two aspects of the retention of pragmatic text functions in translation. The functionalist approach that was used focuses on achieving congruence between the author’s intended function and the perception of the reader, i.e., the target text’s actual function. The first aim was to examine whether a focus on text functions can be beneficial when translating terminology. The second aim was to investigate if a functionalist approach can be used to assure that all functions are retained for instances where the source text encompasses more than one pragmatic function. For the purposes of this study, two excerpts from Fritz Eichenberg’s art history book The Art of the Print were translated. Individual terms as well as instances where the source text segment contained one than more pragmatic function were then analyzed with the above mentioned aims in mind. It was found that a functionalist approach, in combination with a conceptual approach to terminology, was beneficial when translating terminology. It was also observed that the surrounding co-text aided in the understanding of the author’s concept. In regard to the second aim, it was found that while a functionalist approach assured that the translator was made aware of the existing functions, the translation procedures suggested were too narrow and static to be applicable to all segments.

  • 712.
    Agnes, Asker
    Linnaeus University, Faculty of Arts and Humanities, Department of Design.
    a blob, a snap: A materialized revolt against the patriarchal structure, against everything women are being told to endure2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This is a personal project about a fed-up woman who sits down on the chair by the pottery wheel simply because she craves it. It is about conducting a non-result oriented design process. A process where the making, the closeness between the mind and hand, is both the research and mediation. It is a project that acknowledges the potential care has in relation to design, while it's dealing with the controversial aspects of a woman caring for herself. The project is a snap, a feminist snap, represented and materialized through the objects of clay. Where a collapsed bowl, a blob, becomes a materialized revolt against everything women are being told to endure. It is a project that brings design and poetry together. Aiming to explore how objects can gain agency and be in dialogue with society. How objects can materialize both the resistance against, and the result of, the patriarchal structure.

  • 713.
    Agneta, Hedblom
    University of Kalmar, School of Human Sciences.
    Ekonomiskt utsatta barnfamiljers försörjningsvillkor och relationer till välfärdsverksamheter i S Innerstaden – Delrapport 1 i projektet `Barnfamiljers försörjningsvillkor´2001Report (Other academic)
  • 714.
    Agneta, Hedblom
    University of Kalmar, School of Human Sciences.
    Janusansiktet i Aktiveringspolitiken – en studie av Aktiveringspolitiken i Storstadssatsningen2004Report (Other academic)
  • 715.
    Agneta, Hedblom
    University of Kalmar, School of Human Sciences.
    Stegaprojektet - ett försök till samverkan mellan Skola och Socialtjänst1997Report (Other academic)
  • 716.
    Agnevall, Paula
    Växjö University, Faculty of Humanities and Social Sciences, School of Humanities.
    La dichotomie entre le centre et la périphérie dans "Le Ventre de l'Atlantique" de Fatou Diome2007Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 717.
    Agné, Gabriella
    et al.
    Linnaeus University, Faculty of Social Sciences, Department of Social Work.
    Larsson, Helena
    Linnaeus University, Faculty of Social Sciences, Department of Social Work.
    Funktionshinderpolitiskt program: fallstudie om kommuns implementering av en FN-konvention2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Author: Gabriella Agné and Helena Larsson

    Title: Disability policy program – a case study of a municipals implementation of UNs Convention on the Rights of Persons with Disabilities.

    Supervisor: Marianne Westring-Nordh

    Assessor: Ulf Drugge

    This study aims to examine how a small municipal in southern Sweden works with the implementation of the UN Convention on the Rights of Persons with Disabilities and examine the assistant officers knowledge about this work and user organizations inclusion and user involvement.

    The study operates from a qualitative approach based on the results of nine semi-structured interviews with local politicians, assistance officers and representatives from three different user organizations.

    The results show that the municipal has chosen to work with the implementation of the convention by creating policy programs for their departments through dialogue with user organizations, and by mapping the accessibility to public places. The results also show that the assistant officers have been given no information regarding the convention or the policy programs from their employers and instead operate from national legislations and prepositions. The user organizations feel that they were initially included in the process, but that their impact has later been removed due to structural reorganization.

  • 718.
    Agovic, Mujesira
    Linnaeus University, Faculty of Social Sciences, Department of Social Work.
    Kvinnor som bryter upp från en våldsam relation: En analys av fem självbiografier2016Independent thesis Basic level (degree of Bachelor), 210 HE creditsStudent thesis
    Abstract [en]

    The study describes five autobiographies of women who have been victims of domestic violence, in order to then analyse the processes that enable women to leave a violent husband. The questions I wanted to look in too were: How do the women in the autobiographies describe the process when they free themselves from the man?  What are the difficulties women face in the process of getting out of a violent relationship and how to explain this process?  How experience and process the woman the relationship to the man after she left him? It appears that women are feeling great in the beginning of the relationships.  The men were loving and allure. This changed and the men exerted violence and tried to control and demanded the women's adaptation. Control and customization go hand in hand and are becoming gradually stronger. The process is gradually changing, not on a conscious level, that the destructive, violent relationship becomes normalized. The paper deals with the normalization process, emotional ties, breaking-up processes and exit process. The study is based on the hermeneutists perspective. Narrative analyse is also used in order to decode the autobiographies. For a woman to succeed with the breakup, she must recognize that she must leave the man and make decisions for herself. Insight gives women the strength to move on from the relationship. All the women in the autobiographies describe that they have broken free from the relationship and that they now lead a good life.

  • 719.
    Agram, Nacira
    University of Oslo, Norway;University of Biskra, Algeria.
    Dynamic risk measure for BSVIE with jumps and semimartingale issues2019In: Stochastic Analysis and Applications, ISSN 0736-2994, E-ISSN 1532-9356, Vol. 37, no 3, p. 361-376Article in journal (Refereed)
    Abstract [en]

    Risk measure is a fundamental concept in finance and in the insuranceindustry. It is used to adjust life insurance rates. In this article,we will study dynamic risk measures by means of backward stochasticVolterra integral equations (BSVIEs) with jumps. We prove a comparisontheorem for such a type of equations. Since the solution of aBSVIEs is not a semimartingale in general, we will discuss some particularsemimartingale issues.

  • 720.
    Agram, Nacira
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Stochastic optimal control of McKean-Vlasov equations with anticipating law2019In: Afrika Matematika, ISSN 1012-9405, E-ISSN 2190-7668Article in journal (Refereed)
    Abstract [en]

    We are interested in Pontryagin’s stochastic maximum principle of controlled McKean–Vlasov stochastic differential equations. We allow the law to be anticipating, in the sense that, the coefficients (the drift and the diffusion coefficients) depend not only of the solution at the current time t, but also on the law of the future values of the solution PX(t+δ)" role="presentation">PX(t+δ), for a given positive constant δ" role="presentation">δ. We emphasise that being anticipating w.r.t. the law of the solution process does not mean being anticipative in the sense that it anticipates the driving Brownian motion. As an adjoint equation, a new type of delayed backward stochastic differential equations (BSDE) with implicit terminal condition is obtained. By using that the expectation of any random variable is a function of its law, our BSDE can be written in a simple form. Then, we prove existence and uniqueness of the solution of the delayed BSDE with implicit terminal value, i.e. with terminal value being a function of the law of the solution itself.

  • 721.
    Agram, Nacira
    et al.
    University of Oslo, Norway;University of Mohamed Khider, Algeria.
    Bachouch, Achref
    University of Oslo, Norway.
    Oksendal, Bernt
    University of Oslo, Norway.
    Proske, Frank
    University of Oslo, Norway.
    Singular Control Optimal Stopping of Memory Mean-Field Processes2019In: SIAM Journal on Mathematical Analysis, ISSN 0036-1410, E-ISSN 1095-7154, Vol. 51, no 1, p. 450-468Article in journal (Refereed)
    Abstract [en]

    The purpose of this paper is to study the following topics and the relation between them: (i) Optimal singular control of mean-field stochastic differential equations with memory; (ii) reflected advanced mean-field backward stochastic differential equations; and (iii) optimal stopping of mean-field stochastic differential equations. More specifically, we do the following: (1) We prove the existence and uniqueness of the solutions of some reflected advanced memory backward stochastic differential equations; (2) we give sufficient and necessary conditions for an optimal singular control of a memory mean-field stochastic differential equation (MMSDE) with partial information; and (3) we deduce a relation between the optimal singular control of an MMSDE and the optimal stopping of such processes.

  • 722.
    Agram, Nacira
    et al.
    University of Oslo, Norway.
    Engen Rose, Elin
    University of Biskra, Algeria.
    Optimal control of forward–backward mean-field stochastic delayed systems2018In: Afrika Matematika, ISSN 1012-9405, E-ISSN 2190-7668, Vol. 29, no 1-2, p. 149-174Article in journal (Refereed)
    Abstract [en]

    We study methods for solving stochastic control problems of systems offorward–backward mean-field equations with delay, in finite and infinite time horizon.Necessary and sufficient maximum principles under partial information are given. The resultsare applied to solve a mean-field recursive utility optimal problem.

  • 723.
    Agram, Nacira
    et al.
    University Med Khider, Algeria.
    Haadem, Sven
    Linnaeus University, Faculty of Technology, Department of Mathematics. University of Oslo, Norway.
    Oksendal, Bernt
    University Med Khider, Algeria.
    Proske, Frank
    University of Oslo, Norway.
    A maximum principle for infinite horizon delay equations2013In: SIAM Journal on Mathematical Analysis, ISSN 0036-1410, E-ISSN 1095-7154, Vol. 45, no 4, p. 2499-2522Article in journal (Refereed)
    Abstract [en]

    We prove a maximum principle of optimal control of stochastic delay equations on infinite horizon. We establish first and second sufficient stochastic maximum principles as well as necessary conditions for that problem. We illustrate our results with an application to the optimal consumption rate from an economic quantity.

  • 724.
    Agram, Nacira
    et al.
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Haadem, Sven
    Oksendal, Bernt
    Proske, Frank
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Optimal stopping, randomized stopping and singular control with partial information flowIn: Article in journal (Refereed)
  • 725.
    Agram, Nacira
    et al.
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Hilbert, Astrid
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Oksendal, Bernt
    Singular control of SPDEs with space-mean dynamicsIn: Article in journal (Refereed)
  • 726.
    Agram, Nacira
    et al.
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Hu, Yaozhong
    Mean-field backward stochastic differential equations and applicationsIn: Article in journal (Refereed)
  • 727.
    Agram, Nacira
    et al.
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Oksendal, Bernt
    Introduction to White Noise, Hida-Malliavin Calculus and ApplicationsAuteursIn: Article in journal (Refereed)
  • 728.
    Agram, Nacira
    et al.
    Linnaeus University, Faculty of Technology, Department of Mathematics. Univ Oslo, Norway.
    Oksendal, Bernt
    Univ Oslo, Norway.
    Mean-field stochastic control with elephant memory in finite and infinite time horizon2019In: Stochastics: An International Journal of Probablitiy and Stochastic Processes, ISSN 1744-2508, E-ISSN 1744-2516Article in journal (Refereed)
    Abstract [en]

    Our purpose of this paper is to study stochastic control problems for systems driven by mean-field stochastic differential equations with elephant memory, in the sense that the system (like the elephants) never forgets its history. We study both the finite horizon case and the infinite time horizon case. In the finite horizon case, results about existence and uniqueness of solutions of such a system are given. Moreover, we prove sufficient as well as necessary stochastic maximum principles for the optimal control of such systems. We apply our results to solve a mean-field linear quadratic control problem. For infinite horizon, we derive sufficient and necessary maximum principles. As an illustration, we solve an optimal consumption problem from a cash flow modelled by an elephant memory mean-field system.

  • 729.
    Agram, Nacira
    et al.
    University of Oslo, Norway;University of Biskra, Algeria.
    Oksendal, Bernt
    University of Oslo, Norway.
    Model uncertainty stochastic mean-field control2019In: Stochastic Analysis and Applications, ISSN 0736-2994, E-ISSN 1532-9356, Vol. 37, no 1, p. 36-56Article in journal (Refereed)
    Abstract [en]

    We consider the problem of optimal control of a mean-field stochasticdifferential equation (SDE) under model uncertainty. The model uncertaintyis represented by ambiguity about the law LðXðtÞÞ of the stateX(t) at time t. For example, it could be the law LPðXðtÞÞ of X(t) withrespect to the given, underlying probability measure P. This is the classicalcase when there is no model uncertainty. But it could also be thelaw LQðXðtÞÞ with respect to some other probability measure Q or,more generally, any random measure lðtÞ on R with total mass 1. Werepresent this model uncertainty control problem as a stochastic differentialgame of a mean-field related type SDE with two players. Thecontrol of one of the players, representing the uncertainty of the lawof the state, is a measure-valued stochastic process lðtÞ and the controlof the other player is a classical real-valued stochastic process u(t).This optimal control problem with respect to random probability processeslðtÞ in a non-Markovian setting is a new type of stochastic controlproblems that has not been studied before. By constructing a newHilbert space M of measures, we obtain a sufficient and a necessarymaximum principles for Nash equilibria for such games in the generalnonzero-sum case, and for saddle points in zero-sum games. As anapplication we find an explicit solution of the problem of optimal consumptionunder model uncertainty of a cash flow described by amean-field related type SDE.

  • 730.
    Agram, Nacira
    et al.
    University of Oslo, Norway;University of Biskra, Algeria.
    Øksendal, Bernt
    University of Oslo, Norway.
    A Hida-Malliavin white noise calculus approach to optimal control2018In: Infinite Dimensional Analysis Quantum Probability and Related Topics, ISSN 0219-0257, Vol. 21, no 3, article id 1850014Article in journal (Refereed)
    Abstract [en]

    The classical maximum principle for optimal stochastic control states that if a control û is optimal, then the corresponding Hamiltonian has a maximum at u = û. The first proofs for this result assumed that the control did not enter the diffusion coefficient. Moreover, it was assumed that there were no jumps in the system. Subsequently, it was discovered by Shige Peng (still assuming no jumps) that one could also allow the diffusion coefficient to depend on the control, provided that the corresponding adjoint backward stochastic differential equation (BSDE) for the first-order derivative was extended to include an extra BSDE for the second-order derivatives. In this paper, we present an alternative approach based on Hida-Malliavin calculus and white noise theory. This enables us to handle the general case with jumps, allowing both the diffusion coefficient and the jump coefficient to depend on the control, and we do not need the extra BSDE with second-order derivatives. The result is illustrated by an example of a constrained linear-quadratic optimal control.

  • 731.
    Agram, Nacira
    et al.
    University Med Khider, Algeria.
    Øksendal, Bernt
    University of Oslo, Norway.
    Infinite horizon optimal control of forward–backward stochastic differential equations with delay2014In: Journal of Computational and Applied Mathematics, ISSN 0377-0427, E-ISSN 1879-1778, Vol. 259, no Part B, p. 336-349Article in journal (Refereed)
    Abstract [en]

    We consider a problem of optimal control of an infinite horizon system governed by forward–backward stochastic differential equations with delay. Sufficient and necessary maximum principles for optimal control under partial information in infinite horizon are derived. We illustrate our results by an application to a problem of optimal consumption with respect to recursive utility from a cash flow with delay.

  • 732.
    Agram, Nacira
    et al.
    University Med Khider, Algeria.
    Øksendal, Bernt
    University of Oslo, Norway.
    Malliavin calculus and optimal control of stochastic Volterra equations2015In: Journal of Optimization Theory and Applications, ISSN 0022-3239, E-ISSN 1573-2878, Vol. 167, no 3, p. 1070-1094Article in journal (Refereed)
    Abstract [en]

    Solutions of stochastic Volterra (integral) equations are not Markov processes, and therefore, classical methods, such as dynamic programming, cannot be used to study optimal control problems for such equations. However, we show that using Malliavin calculus, it is possible to formulate modified functional types of maximum principle suitable for such systems. This principle also applies to situations where the controller has only partial information available to base her decisions upon. We present both a Mangasarian sufficient condition and a Pontryagin-type maximum principle of this type, and then, we use the results to study some specific examples. In particular, we solve an optimal portfolio problem in a financial market model with memory.

  • 733.
    Agram, Nacira
    et al.
    University of Oslo, Norway.
    Øksendal, Bernt
    Univeristy of Oslo, Norway.
    Stochastic control of memory mean-field processes2019In: Applied mathematics and optimization, ISSN 0095-4616, E-ISSN 1432-0606, Vol. 79, no 1, p. 181-204Article in journal (Refereed)
    Abstract [en]

    By a memory mean-field process we mean the solution X(&#x22C5;)" role="presentation">X(⋅) of a stochastic mean-field equation involving not just the current state X(t) and its law L(X(t))" role="presentation">L(X(t)) at time t,  but also the state values X(s) and its law L(X(s))" role="presentation">L(X(s)) at some previous times s&lt;t." role="presentation">s<t. Our purpose is to study stochastic control problems of memory mean-field processes. We consider the space M" role="presentation">M of measures on R" role="presentation">R with the norm ||&#x22C5;||M" role="presentation">||⋅||M introduced by Agram and Øksendal (Model uncertainty stochastic mean-field control. arXiv:1611.01385v5, [2]), and prove the existence and uniqueness of solutions of memory mean-field stochastic functional differential equations. We prove two stochastic maximum principles, one sufficient (a verification theorem) and one necessary, both under partial information. The corresponding equations for the adjoint variables are a pair of (time-advanced backward stochastic differential equations (absdes), one of them with values in the space of bounded linear functionals on path segment spaces. As an application of our methods, we solve a memory mean–variance problem as well as a linear–quadratic problem of a memory process.

  • 734.
    Agram, Nacira
    et al.
    University of Oslo, Norway;University Mohamed Knider of Biskra, Algeria.
    Øksendal, Bernt
    University of Oslo, Norway.
    Yakhlef, Samia
    University Mohamed Khider of Biskra, Algeria.
    New approach to optimal control of stochastic Volterra integral equations2019In: Stochastics: An International Journal of Probablitiy and Stochastic Processes, ISSN 1744-2508, E-ISSN 1744-2516, Vol. 91, no 6, p. 873-894Article in journal (Refereed)
    Abstract [en]

    We study optimal control of stochastic Volterra integral equations(SVIE) with jumps by using Hida-Malliavin calculus.

    • We give conditions under which there exist unique solutions ofsuch equations.

    • Then we prove both a sufficient maximum principle (a verificationtheorem) and a necessary maximum principle via Hida-Malliavincalculus.

    • As an application we solve a problem of optimal consumptionfrom a cash flow modelled by an SVIE.

  • 735. Agrell, C
    et al.
    Larsson, Per
    Lund university.
    Okla, L
    Agrell, J
    PCB congeners in precipitation, wash out ratios and depositional fluxes within the Baltic Sea region, Europe2002In: Atmospheric environment, Vol. 36, p. 371-383Article in journal (Refereed)
  • 736. Agrell, C
    et al.
    Okla, L
    Larsson, Per
    Lund university.
    Backe, C
    Wania, F
    Evidence of latitudinal fractionation of polychlorinated biphenyls along the Baltic Sea regions1999In: Environmental science and technology, Vol. 33, p. 1149-1156Article in journal (Refereed)
  • 737. Agrell, C
    et al.
    ter Schure, A F H
    Larsson, Per
    Lund university.
    Sveder, J
    Bokenstrand, A
    Zegers, B
    Polybrominated biphenyl ethers (PBDEs) at a solid waste incineration plant: Atmospheric concentrations2004In: Atmospheric environment, Vol. 38, p. 5139-5148Article in journal (Refereed)
  • 738.
    Agrell, Carina
    Linnaeus University, Faculty of Social Sciences, Department of pedagogy.
    Begreppet "Kreativitet": Teoretisk analys samt studie om pedagogers självskattning ur experimentella perspektiv2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Uppsatsens syfte är att teoretiskt analysera begreppet ”kreativitet”, liksom att nomotetiskt undersöka pedagogers uppfattning om begreppet ur fem experimentella perspektiv. Ur analysmaterialet har därför en enkät konstruerats. Enkäten, vilken biläggs, består av frågor om självskattning av pedagogernas föreställningar om begreppet kreativitet – genom tre kunskapsdimensioner (varav faktadimensionen presenteras) och fem experimentella perspektiv. Övriga delar av enkäten valdes bort i analyshänseende. Undersökningsgruppen utgörs av 56 respondenter, vilka själva spontant kunde välja att delta i mailundersökningen. Resultatet visar att pedagogerna som grupp, ur perspektivet Kreativitetens uttryckssätt anser sig ha goda kunskaper, och ur perspektivet Kreativitetens förutsättningar och gränser anser sig ha mycket små kunskaper. Med en styrd undersökningsgrupp beträffande respondenternas respektive ämneskategorier och kön för en kontrollerad fördelning, liksom en initial presentation av perspektivens innehåll och betydelse, skulle studien uppnå högre validitet och reliabilitet.

  • 739.
    Agrell, Sofia
    et al.
    Linnaeus University, School of Business and Economics, Department of Organisation and Entrepreneurship.
    Svensson, Paulina
    Linnaeus University, School of Business and Economics, Department of Organisation and Entrepreneurship.
    Vem bestämmer vem du är?: Identitetsregleringens påverkan på anställdas identitet2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Författare: Sofia Agrell och Paulina Svensson

    Handledare: Kjell Arvidsson

    Examinator: Hans Wessblad                                                

    Kurs: Företagsekonomi III - organisation, examensarbete (kandidat) 15 hp, 2FE78E

     

    Titel: Vem bestämmer vem du är?

     

    Problemformulering: Hur används identitetsreglering för att påverka anställdas identitet?

     

    Syfte: Uppsatsens syfte är att identifiera vilka aspekter av identitetsreglering som används inom organisationer genom att ta reda på vilka medel som används för att påverka de anställdas identitet.

     

    Metod: Studien har en deduktiv ansats med en kvalitativ datainsamling. Vid insamlingen av empiriskt material genomfördes semi-strukturerade intervjuer. Studien baseras på nio hypoteser som bygger på teoretisk insamlat material  och som sedan provats mot empirin.

     

    Slutsats: Studien har verifierat de nio olika hypoteserna kring hur identitetsreglering sker inom organisationer men också att användandet av de olika hypoteserna sker på olika nivåer. Studien visade att vissa hypoteser används mer än andra. Genom samhörighet och socialisation regleras identiteten hos den anställde lättare. Även värderingar och utbildningar visade sig vara ett effektivt medel för att påverka individens föreställningar och leda individen mot organisationens mål. Social identitet och grupper har en betydande roll för hur individer identifierar sig och studien påvisade att reglera anställda genom att delegera dem till en enhetlig grupp. Studien har även visat att en centralstyrd organisation kan forma de anställda lättare genom att använda tydliga regler som medel.

  • 740.
    Aguiar, Daniella
    et al.
    Federal University of Uberlândia, Brazil.
    Atã, Pedro
    Federal University of Juiz de Fora, Brazil.
    Queiroz, Joao
    Federal University of Juiz de Fora, Brazil.
    Intersemiotic translation and transformational creativity2015In: Punctum. International Journal of Semiotics, ISSN 2459-2943, Vol. 1, no 2, p. 11-21Article in journal (Refereed)
    Abstract [en]

    In this article we approach a case of intersemiotic translation as a paradigmatic example of Boden’s ‘transformational creativity’ category. To develop our argument, we consider Boden’s fundamental notion of ‘conceptual space’ as a regular pattern of semiotic action, or ‘habit’ (sensu Peirce). We exemplify with Gertrude Stein’s intersemiotic translation of Cézanne and Picasso’s proto-cubist and cubist paintings. The results of Stein’s IT transform the conceptual space of modern literature, constraining it towards new patterns of semiosis. Our association of Boden’s framework to describe a cognitive creative phenomenon with a philosophically robust theory of meaning results in a cognitive semiotic account of IT.

  • 741.
    Aguiar, Daniella
    et al.
    Universidade Federal de Juiz de Fora, Brazil.
    Atã, Pedro
    Universidade Federal de Juiz de Fora, Brazil.
    Queiroz, João
    Universidade Federal de Juiz de Fora, Brazil.
    Creativity as niche construction and some examples in theatrical dance2017In: Annals of the X Brazilian International Meeting on Cognitive Science - EBICC 2015 / [ed] J. E. Kogler; O. F. Pessoa Jr.; J. A. de Moraes, Sociedade Brasileira de Ciencia Cognitiva - SBCC , 2017Conference paper (Refereed)
    Abstract [en]

    Creativity can be regarded as a property of semiotic resource exploration and niche construction. More specifically, and according to this perspective, creativity is distributed, in cognitive niches, as opportunities for niche-construction. Artistic cognitive niches represent established ways to exploit available artistic semiotic resources. When such opportunities are explored so that new relations between cognition and artistic semiotic resources are established (i.e., the artistic cognitive niche is constructed), then creativity is observed. This process of niche construction involves the transformation of problem spaces ("a branching-tree of achievable situations") through the exploration of cognitive artifacts (in dance, for example, softwares, techniques, equipments such as dance shoes, stage, dance and music notations). Our approach is supported by specific examples in history. In each of these examples, the introduction of artifacts changed not only how to make dance, but also the very concept of dance, opening opportunities for the exploration of new niches.

  • 742. Aguilar, J A
    et al.
    Albert, A
    Ameli, F
    Amram, P
    Anghinolfi, M
    Anton, G
    Anvar, S
    Ardellier-Desages, F E
    Aslanides, E
    Aubert, J J
    Bailey, D
    Basa, S
    Battaglieri, M
    Becherini, Yvonne
    Università e Sezione INFN, Italy.
    Bellotti, R
    Beltramelli, J
    Bertin, V
    Billault, M
    Blaes, R
    Blanc, F
    de Botton, N
    Boulesteix, J
    Bouwhuis, M C
    Brooks, C B
    Bradbury, S M
    Bruijn, R
    Brunner, J
    Burgio, G F
    Cafagna, F
    Calzas, A
    Capone, A
    Caponetto, L
    Carmona, E
    Carr, J
    Cartwright, S L
    Castorina, E
    Cavasinni, V
    Cecchini, S
    Charvis, P
    Circella, M
    Colnard, C
    Compere, C
    Coniglione, R
    Cooper, S
    Coyle, P
    Cuneo, S
    Damy, G
    van Dantzig, R
    Deschamps, A
    De Marzo, C
    Denans, D
    Destelle, J J
    De Vita, R
    Dinkelspiler, B
    Distefano, C
    Drogou, J F
    Druillole, F
    Engelen, J
    Ernenwein, J P
    Falchini, E
    Favard, S
    Feinstein, F
    Ferry, S
    Festy, D
    Flaminio, V
    Fopma, J
    Fuda, J L
    Gallone, J M
    Giacomelli, G
    Girard, N
    Goret, P
    Graf, K
    Hallewell, G
    Hartmann, B
    Heijboer, A
    Hello, Y
    Hernandez-Rey, J J
    Herrouin, G
    Hossl, J
    Hoffmann, C
    Hubbard, J R
    Jaquet, M
    de Jong, M
    Jouvenot, F
    Kappes, A
    Karg, T
    Karkar, S
    Karolak, M
    Katz, U
    Keller, P
    Kooijman, P
    Korolkova, E V
    Kouchner, A
    Kretschmer, W
    Kuch, S
    Kudryavtsev, V A
    Lafoux, H
    Lagier, P
    Lahmann, R
    Lamare, P
    Languillat, J C
    Laschinsky, H
    Laubier, L
    Legou, T
    Le Guen, Y
    Le Provost, H
    Van Suu, A L
    Lo Nigro, L
    Lo Presti, D
    Loucatos, S
    Louis, F
    Lyashuk, V
    Marcelin, M
    Margiotta, A
    Maron, C
    Massol, A
    Masullo, R
    Mazeas, F
    Mazure, A
    McMillan, J E
    Migneco, E
    Millot, C
    Milovanovic, A
    Montanet, F
    Montaruli, T
    Morel, J P
    Morganti, M
    Moscoso, L
    Musumeci, M
    Naumann, C
    Naumann-Godo, M
    Nezri, E
    Niess, V
    Nooren, G J
    Ogden, P
    Olivetto, C
    Palanque-Delabrouille, N
    Papaleo, R
    Payre, P
    Petta, C
    Piattelli, P
    Pineau, J P
    Poinsignon, J
    Popa, V
    Potheau, R
    Pradier, T
    Racca, C
    Raia, G
    Randazzo, N
    Real, D
    van Rens, B A P
    Rethore, F
    Riccobene, G
    Rigaud, V
    Ripani, M
    Roca-Blay, V
    Rolin, J F
    Romita, M
    Rose, H J
    Rostovtsev, A
    Ruppi, M
    Russo, G V
    Sacquin, Y
    Salesa, F
    Salomon, K
    Saouter, S
    Sapienza, P
    Shanidze, R
    Schuller, J P
    Schuster, W
    Sokalski, I
    Spurio, M
    Stolarczyk, T
    Stubert, D
    Taiuti, M
    Thompson, L F
    Tilav, S
    Valdy, P
    Valente, V
    Vallage, B
    Vernin, P
    Virieux, J
    de Vries, G
    Huberts, P D
    de Wolf, E
    Zaborov, D
    Zaccone, H
    Zakharov, V
    Zornoza, J D
    Zuniga, J
    Study of large hemispherical photomultiplier tubes for the ANTARES neutrino telescope2005In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 555, no 1-2, p. 132-141Article in journal (Refereed)
    Abstract [en]

    The ANTARES neutrino telescope, to be immersed depth in the Mediterranean Sea, will consist of a three-dimensional matrix of 900 large area photomultiplier tubes housed in pressure-resistant glass spheres. The selection of the optimal photomultiplier was a critical step for the project and required an intensive phase of tests and developments carried out in close collaboration with the main manufacturers worldwide. This paper provides an overview of the tests performed by the collaboration and describes in detail the features of the photomultiplier tube chosen for ANTARES. (c) 2005 Elsevier B.V. All rights reserved.

  • 743. Aguilar, J. A.
    et al.
    Albert, A.
    Ameli, F.
    Anghinolfi, M.
    Anton, G.
    Anvar, S.
    Aslanides, E.
    Aubert, J. -J
    Barbarito, E.
    Basa, S.
    Battaglieri, M.
    Becherini, Yvonne
    Università e Sezione INFN, Italy.
    Bellotti, R.
    Beltramelli, J.
    Bertin, V.
    Bigi, A.
    Billault, M.
    Blaes, R.
    de Botton, N.
    Bouwhuis, M. C.
    Bradbury, S. M.
    Bruijn, R.
    Brunner, J.
    Burgio, G. F.
    Busto, J.
    Cafagna, F.
    Caillat, L.
    Calzas, A.
    Capone, A.
    Caponetto, L.
    Carmona, E.
    Carr, J.
    Cartwright, S. L.
    Castel, D.
    Castorina, E.
    Cavasinni, V.
    Cecchini, S.
    Ceres, A.
    Charvis, P.
    Chauchot, P.
    Chiarusi, T.
    Circella, M.
    Colnard, C.
    Compere, C.
    Coniglione, R.
    Cottini, N.
    Coyle, P.
    Cuneo, S.
    Cussatlegras, A. -S
    Damy, G.
    van Dantzig, R.
    De Marzo, C.
    Dekeyser, I.
    Delagnes, E.
    Denans, D.
    Deschamps, A.
    Dessages-Ardellier, F.
    Destelle, J. -J
    Dinkespieler, B.
    Distefano, C.
    Donzaud, C.
    Drogou, J. -F
    Druillole, F.
    Durand, D.
    Ernenwein, J. -P
    Escoffier, S.
    Falchini, E.
    Favard, S.
    Feinstein, F.
    Ferry, S.
    Festy, D.
    Fiorello, C.
    Flaminio, V.
    Galeotti, S.
    Gallone, J. -M
    Giacomelli, G.
    Girard, N.
    Gojak, C.
    Goret, Ph.
    Graf, K.
    Hallewell, G.
    Harakeh, M. N.
    Hartmann, B.
    Heijboer, A.
    Heine, E.
    Hello, Y.
    Hernandez-Rey, J. J.
    Hoessl, J.
    Hoffman, C.
    Hogenbirk, J.
    Hubbard, J. R.
    Jaquet, M.
    Jaspers, M.
    de Jong, M.
    Jouvenot, F.
    Kalantar-Nayestanaki, N.
    Kappes, A.
    Karg, T.
    Karkar, S.
    Katz, U.
    Keller, P.
    Kok, H.
    Kooijman, P.
    Kopper, C.
    Korolkova, E. V.
    Kouchner, A.
    Kretschmer, W.
    Kruijer, A.
    Kuch, S.
    Kudryavstev, V. A.
    Lachartre, D.
    Lafoux, H.
    Lagier, P.
    Lahmann, R.
    Lamanna, G.
    Lamare, P.
    Languillat, J. C.
    Laschinsky, H.
    Le Guen, Y.
    Le Provost, H.
    Suu, A. Le Van
    Legou, T.
    Lim, G.
    Lo Nigro, L.
    Lo Presti, D.
    Loehner, H.
    Loucatos, S.
    Louis, F.
    Lucarelli, F.
    Lyashuk, V.
    Marcelin, M.
    Margiotta, A.
    Masullo, R.
    Mazeas, F.
    Mazure, A.
    McMillan, J. E.
    Megna, R.
    Melissas, M.
    Migneco, E.
    Milovanovic, A.
    Mongelli, M.
    Montaruli, T.
    Morganti, M.
    Moscoso, L.
    Musumeci, M.
    Naumann, C.
    Naumann-Godo, M.
    Niess, V.
    Olivetto, C.
    Ostasch, R.
    Palanque-Delabrouille, N.
    Payre, P.
    Peek, H.
    Petta, C.
    Piattelli, P.
    Pineau, J. -P
    Poinsignon, J.
    Popa, V.
    Pradier, T.
    Racca, C.
    Randazzo, N.
    van Randwijk, J.
    Real, D.
    van Rens, B.
    Rethore, F.
    Rewiersma, P.
    Riccobene, G.
    Rigaud, V.
    Ripani, M.
    Roca, V.
    Roda, C.
    Rolin, J. F.
    Romita, M.
    Rose, H. J.
    Rostovtsev, A.
    Roux, J.
    Ruppi, M.
    Russo, G. V.
    Salesa, F.
    Salomon, K.
    Sapienza, P.
    Schmitt, F.
    Schuller, J. -P
    Shanidze, R.
    Sokalski, I.
    Spona, T.
    Spurio, M.
    van der Steenhoven, G.
    Stolarczyk, T.
    Streeb, K.
    Stubert, D.
    Sulak, L.
    Taiuti, M.
    Tamburini, C.
    Tao, C.
    Terreni, G.
    Thompson, L. F.
    Valdy, P.
    Valente, V.
    Vallage, B.
    Venekamp, G.
    Verlaat, B.
    Vernin, P.
    de Vita, R.
    de Vries, G.
    van Wijk, R.
    Huberts, P. de Witt
    Wobbe, G.
    de Wolf, E.
    Yao, A-F
    Zaborov, D.
    Zaccone, H.
    Zornoza, J. D.
    Zuniga, J.
    The data acquisition system for the ANTARES neutrino telescope2007In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 570, no 1, p. 107-116Article in journal (Refereed)
    Abstract [en]

    The ANTARES neutrino telescope is being constructed in the Mediterranean Sea. It consists of a large three-dimensional array of photo-multiplier tubes. The data acquisition system of the detector takes care of the digitisation of the photo-multiplier tube signals, data transport, data filtering, and data storage. The detector is operated using a control program interfaced with all elements. The design and the implementation of the data acquisition system are described. (c) 2006 Elsevier B.V. All rights reserved.

  • 744. Aguilar, J. A.
    et al.
    Albert, A.
    Ameli, F.
    Anghinolfi, M.
    Anton, G.
    Anvar, S.
    Aslanides, E.
    Aubert, J. -J
    Barbarito, E.
    Basa, S.
    Battaglieri, M.
    Becherini, Yvonne
    Università e Sezione INFN, Italy.
    Bellotti, R.
    Beltramelli, J.
    Bertin, V.
    Bigi, A.
    Billault, M.
    Blaes, R.
    de Botton, N.
    Bouwhuis, M. C.
    Bradbury, S. M.
    Bruijn, R.
    Brunner, J.
    Burgio, G. F.
    Busto, J.
    Cafagna, F.
    Caillat, L.
    Calzas, A.
    Capone, A.
    Caponetto, L.
    Carmona, E.
    Carr, J.
    Cartwright, S. L.
    Castel, D.
    Castorina, E.
    Cavasinni, V.
    Cecchini, S.
    Ceres, A.
    Charvis, P.
    Chauchot, P.
    Chiarusi, T.
    Circella, M.
    Colnard, C.
    Compere, C.
    Coniglione, R.
    Cottini, N.
    Coyle, P.
    Cuneo, S.
    Cussatlegras, A. -S
    Damy, G.
    van Dantzig, R.
    De Marzo, C.
    Dekeyser, I.
    Delagnes, E.
    Denans, D.
    Deschamps, A.
    Dessages-Ardellier, F.
    Destelle, J. -J
    Dinkespieler, B.
    Distefano, C.
    Donzaud, C.
    Drogou, J. -F
    Druillole, F.
    Durand, D.
    Ernenwein, J. -P
    Escoffier, S.
    Falchini, E.
    Favard, S.
    Feinstein, F.
    Ferry, S.
    Festy, D.
    Fiorello, C.
    Flaminio, V.
    Galeotti, S.
    Gallone, J. -M
    Giacomelli, G.
    Girard, N.
    Gojak, C.
    Goret, Ph.
    Graf, K.
    Hallewell, G.
    Harakeh, M. N.
    Hartmann, B.
    Heijboer, A.
    Heine, E.
    Hello, Y.
    Hernandez-Rey, J. J.
    Hoessl, J.
    Hoffman, C.
    Hogenbirk, J.
    Hubbard, J. R.
    Jaquet, M.
    Jaspers, M.
    de Jong, M.
    Jouvenot, F.
    Kalantar-Nayestanaki, N.
    Kappes, A.
    Karg, T.
    Karkar, S.
    Katz, U.
    Keller, P.
    Kok, H.
    Kooijman, P.
    Kopper, C.
    Korolkova, E. V.
    Kouchner, A.
    Kretschmer, W.
    Kruijer, A.
    Kuch, S.
    Kudryavstev, V. A.
    Lachartre, D.
    Lafoux, H.
    Lagier, P.
    Lahmann, R.
    Lamanna, G.
    Lamare, P.
    Languillat, J. C.
    Laschinsky, H.
    Le Guen, Y.
    Le Provost, H.
    Van Suu, A. Le
    Legou, T.
    Lim, G.
    Lo Nigro, L.
    Lo Presti, D.
    Loehner, H.
    Loucatos, S.
    Louis, F.
    Lucarelli, F.
    Lyashuk, V.
    Marcelin, M.
    Margiotta, A.
    Masullo, R.
    Mazeas, F.
    Mazure, A.
    McMillan, J. E.
    Megna, R.
    Melissas, M.
    Migneco, E.
    Milovanovic, A.
    Mongelli, M.
    Montaruli, T.
    Morganti, M.
    Moscoso, L.
    Musumeci, M.
    Naumann, C.
    Naumann-Godo, M.
    Niess, V.
    Olivetto, C.
    Ostasch, R.
    Palanque-Delabrouille, N.
    Payre, P.
    Peek, H.
    Petta, C.
    Piattelli, P.
    Pineau, J. -P
    Poinsignon, J.
    Popa, V.
    Pradier, T.
    Racca, C.
    Randazzo, N.
    van Randwijk, J.
    Real, D.
    van Rens, B.
    Rethore, F.
    Rewiersma, P.
    Riccobene, G.
    Rigaud, V.
    Ripani, M.
    Roca, V.
    Roda, C.
    Rolin, J. F.
    Romita, M.
    Rose, H. J.
    Rostovtsev, A.
    Roux, J.
    Ruppi, M.
    Russo, G. V.
    Salesa, F.
    Salomon, K.
    Sapienza, P.
    Schmitt, F.
    Schuller, J. -P
    Shanidze, R.
    Sokalski, I.
    Spona, T.
    Spurio, M.
    van der Steenhoven, G.
    Stolarczyk, T.
    Streeb, K.
    Stubert, D.
    Sulak, L.
    Taiuti, M.
    Tamburini, C.
    Tao, C.
    Terreni, G.
    Thompson, L. F.
    Valdy, P.
    Valente, V.
    Vallage, B.
    Venekamp, G.
    Verlaat, B.
    Vernin, P.
    de Vita, R.
    de Vries, G.
    van Wijk, R.
    Huberts, P. de Witt
    Wobbe, G.
    de Wolf, E.
    Yao, A. -F
    Zaborov, D.
    Zaccone, H.
    Zornoza, J. D.
    Zuniga, J.
    First results of the instrumentation line for the deep-sea ANTARES neutrino telescope2006In: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 26, no 4-5, p. 314-324Article in journal (Refereed)
    Abstract [en]

    In 2005, the ANTARES Collaboration deployed and operated at a depth of 2500 m a so-called Mini Instrumentation Line equipped with Optical Modules (MILOM) at the ANTARES site. The various data acquired during the continuous operation from April to December 2005 of the MILOM confirm the satisfactory performance of the Optical Modules, their front-end electronics and readout system. as well as the calibration devices of the detector. The in situ measurement of the Optical Module time response yields a resolution better than 0.5 ns. The performance of the acoustic positioning system, which enables the spatial reconstruction of the ANTARES detector with a precision of about 10 cm, is verified. These results demonstrate that with the full ANTARES neutrino telescope the design angular resolution of better than 0.3 degrees can be realistically achieved.

  • 745. Aguilar, J A
    et al.
    Albert, A
    Amram, P
    Anghinolfi, M
    Anton, G
    Anvar, S
    Ardellier-Desages, F E
    Aslanides, E
    Aubert, J J
    Azoulay, R
    Bailey, D
    Basa, S
    Battaglieri, M
    Becherini, Yvonne
    Università e Sezione INFN, Italy.
    Bellotti, R
    Beltramelli, J
    Bertin, V
    Billault, M
    Blaes, R
    Blanc, F
    Bland, R W
    de Botton, N
    Boulesteix, J
    Bouwhuis, M C
    Brooks, C B
    Bradbury, S M
    Bruijn, R
    Brunner, J
    Bugeon, F
    Burgio, G F
    Cafagna, F
    Calzas, A
    Caponetto, L
    Carmona, E
    Carr, J
    Cartwright, S L
    Cecchini, S
    Charvis, P
    Circella, M
    Colnard, C
    Compere, C
    Croquette, J
    Cooper, S
    Coyle, P
    Cuneo, S
    Damy, G
    van Dantzig, R
    Deschamps, A
    De Marzo, C
    Destelle, J J
    De Vita, R
    Dinkelspiler, B
    Dispau, G
    Drougou, J F
    Druillole, F
    Engelen, J
    Favard, S
    Feinstein, F
    Ferry, S
    Festy, D
    Fopma, J
    Fuda, J L
    Gallone, J M
    Giacomelli, G
    Girard, N
    Goret, P
    Gournay, J F
    Hallewell, G
    Hartmann, B
    Heijboer, A
    Hello, Y
    Hernandez-Rey, J J
    Herrouin, G
    Hossl, J
    Hoffmann, C
    Hubbard, J R
    Jaquet, M
    de Jong, M
    Jouvenot, F
    Kappes, A
    Karg, T
    Karkar, S
    Karolak, M
    Katz, U
    Keller, P
    Kooijman, P
    Korolkova, E V
    Kouchner, A
    Kretschmer, W
    Kudryavtsev, V A
    Lafoux, H
    Lagier, P
    Lamare, P
    Languillat, J C
    Laubler, L
    Legou, T
    Le Guen, Y
    Le Provost, H
    Le van Suu, A
    Lo Nigro, L
    Lo Presti, D
    Loucatos, S
    Louis, F
    Lyashuk, V
    Magnier, P
    Marcelin, M
    Margiotta, A
    Maron, C
    Massol, A
    Mazeas, F
    Mazeau, B
    Mazure, A
    McMillan, J E
    Michel, J L
    Millot, C
    Milovanovic, A
    Montanet, F
    Montaruli, T
    Morel, J P
    Moscoso, L
    Nezri, E
    Niess, V
    Nooren, G J
    Ogden, P
    Olivetto, C
    Palanque-Delabrouille, N
    Payre, P
    Petta, C
    Pineau, J P
    Poinsignon, J
    Popa, V
    Potheau, R
    Pradier, T
    Racca, C
    Randazzo, N
    Real, D
    van Rens, B A P
    Rethore, F
    Ripani, M
    Roca-Blay, V
    Romeyer, A
    Rollin, J F
    Romita, M
    Rose, H J
    Rostovtsev, A
    Ruppi, M
    Russo, G V
    Sacquin, Y
    Saouter, S
    Schuller, J P
    Schuster, W
    Sokalski, I
    Suvorova, O
    Spooner, N J C
    Spurio, M
    Stolarczyk, T
    Stubert, D
    Taiuti, M
    Thompson, L F
    Tilav, S
    Usik, A
    Valdy, P
    Vallage, B
    Vaudaine, G
    Vernin, P
    Virieux, J
    Vladimirsky, E
    de Vries, G
    Huberts, P D
    de Wolf, E
    Zaborov, D
    Zaccone, H
    Zakharov, V
    Zavatarelli, S
    de Zornoza, J D
    Zuniga, J
    Transmission of light in deep sea water at the site of the ANTARES neutrino telescope2005In: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 23, no 1, p. 131-155Article in journal (Refereed)
    Abstract [en]

    The ANTARES neutrino telescope is a large photomultiplier array designed to detect neutrino-induced upward-going muons by their Cherenkov radiation. Understanding the absorption and scattering of light in the deep Mediterranean is fundamental to optimising the design and performance of the detector. This paper presents measurements of blue and UV light transmission at the ANTARES site taken between 1997 and 2000. The derived values for the scattering length and the angular distribution of particulate scattering were found to be highly correlated, and results are therefore presented in terms of an absorption length;,ab, and an effective scattering length lambda(sct)(eff). The values for blue (UV) light are found to be lambda(abs) similar or equal to 60(26) m, lambda(sct)(eff similar or equal to) 265(122) m, with significant (similar to15%) time variability. Finally, the results of ANTARES simulations showing the effect of these water properties on the anticipated performance of the detector are presented. (C) 2004 Elsevier B.V. All rights reserved.

  • 746.
    Aguirre-Gutierrez, Jesus
    et al.
    Naturalis Biodivers Ctr, Netherlands;Univ Oxford, UK;Univ Amsterdam, Netherlands.
    WallisDeVries, Michiel F.
    De Vlinderstichting, Netherlands;Wageningen Univ, Netherlands.
    Marshall, Leon
    Naturalis Biodivers Ctr, Netherlands;Univ Namur, Belgium.
    van't Zelfde, Maarten
    Naturalis Biodivers Ctr, Netherlands;Leiden Univ, Netherlands.
    Villalobos-Arambula, Alma R.
    Univ Guadalajara, Mexico.
    Boekelo, Bastiaen
    Wageningen Univ & Res, Netherlands.
    Bartholomeus, Harm
    Wageningen Univ & Res, Netherlands.
    Franzén, Markus
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. UFZ, Helmholtz Ctr Environm Res, Germany.
    Biesmeijer, Jacobus C.
    Naturalis Biodivers Ctr, Netherlands;Leiden Univ, Netherlands.
    Butterflies show different functional and species diversity in relationship to vegetation structure and land use2017In: Global Ecology and Biogeography, ISSN 1466-822X, E-ISSN 1466-8238, Vol. 26, no 10, p. 1126-1137Article in journal (Refereed)
    Abstract [en]

    AimBiodiversity is rapidly disappearing at local and global scales also affecting the functional diversity of ecosystems. We aimed to assess whether functional diversity was correlated with species diversity and whether both were affected by similar land use and vegetation structure drivers. Better understanding of these relationships will allow us to improve our predictions regarding the effects of future changes in land use on ecosystem functions and services. LocationThe Netherlands. MethodsWe compiled a dataset of c.3 million observations of 66 out of 106 known Dutch butterfly species collected across 6,075 sampling locations during a period of 7 years, together with very high-resolution maps of land use and countrywide vegetation structure data. Using a mixed-effects modelling framework, we investigated the relationship between functional and species diversity and their main land use and vegetation structure drivers. ResultsWe found that high species diversity does not translate into high functional diversity, as shown by their different spatial distribution patterns in the landscape. Functional and species diversity are mainly driven by different sets of structural and land use parameters (especially average vegetation height, amount of vegetation between 0.5 and 2m, natural grassland, sandy soils vegetation, marsh vegetation and urban areas). We showed that it is a combination of both vegetation structural characteristics and land use variables that defines functional and species diversity. Main conclusionsFunctional diversity and species diversity of butterflies are not consistently correlated and must therefore be treated separately. High functional diversity levels occurred even in areas with low species diversity. Thus, conservation actions may differ depending on whether the focus is on conservation of high functional diversity or high species diversity. A more integrative analysis of biodiversity at both species and trait levels is needed to infer the full effects of environmental change on ecosystem functioning.

  • 747.
    Aguirre-Gutiérrez, Jesús
    et al.
    Naturalis Biodiversity Center, The Netherlands ; University of Amsterdam, The Netherlands.
    Kissling, W. Daniel
    University of Amsterdam, The Netherlands.
    Carvalheiro, Luísa G.
    Universidade de Brasília, Brazil ; University of Lisbon, Portugal.
    WallisDeVries, Michiel F.
    Wageningen University, The Netherlands.
    Franzén, Markus
    Helmholtz-Centre for Environmental Research - UFZ, Germany.
    Biesmeijer, Jacobus C.
    Naturalis Biodiversity Center, The Netherlands ; University of Amsterdam, The Netherlands.
    Functional traits help to explain half-century long shifts in pollinator distributions2016In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, article id 24451Article in journal (Refereed)
    Abstract [en]

    Changes in climate and land use can have important impacts on biodiversity. Species respond to such environmental modifications by adapting to new conditions or by shifting their geographic distributions towards more suitable areas. The latter might be constrained by species’ functional traits that influence their ability to move, reproduce or establish. Here, we show that functional traits related to dispersal, reproduction, habitat use and diet have influenced how three pollinator groups (bees, butterflies and hoverflies) responded to changes in climate and land-use in the Netherlands since 1950. Across the three pollinator groups, we found pronounced areal range expansions (>53%) and modelled range shifts towards the north (all taxa: 17–22 km), west (bees: 14 km) and east (butterflies: 11 km). The importance of specific functional traits for explaining distributional changes varied among pollinator groups. Larval diet preferences (i.e. carnivorous vs. herbivorous/detritivorous and nitrogen values of host plants, respectively) were important for hoverflies and butterflies, adult body size for hoverflies, and flight period length for all groups. Moreover, interactions among multiple traits were important to explain species’ geographic range shifts, suggesting that taxon-specific multi-trait analyses are needed to predict how global change will affect biodiversity and ecosystem services.

  • 748. Aharonian, F.
    et al.
    Akhperjanian, A. G.
    Anton, G.
    de Almeida, U. Barres
    Bazer-Bachi, A. R.
    Becherini, Yvonne
    Behera, B.
    Benbow, W.
    Bernloehr, K.
    Bochow, A.
    Boisson, C.
    Bolmont, J.
    Borrel, V.
    Brucker, J.
    Brun, F.
    Brun, P.
    Buehler, R.
    Bulik, T.
    Buesching, I.
    Boutelier, T.
    Chadwick, P. M.
    Charbonnier, A.
    Chaves, R. C. G.
    Cheesebrough, A.
    Chounet, L. -M
    Clapson, A. C.
    Coignet, G.
    Dalton, M.
    Daniel, M. K.
    Davids, I. D.
    Degrange, B.
    Deil, C.
    Dickinson, H. J.
    Djannati-Atai, A.
    Domainko, W.
    Drury, L. O 'C.
    Dubois, F.
    Dubus, G.
    Dyks, J.
    Dyrda, M.
    Egberts, K.
    Emmanoulopoulos, D.
    Espigat, P.
    Farnier, C.
    Feinstein, F.
    Fiasson, A.
    Foerster, A.
    Fontaine, G.
    Fuessling, M.
    Gabici, S.
    Gallant, Y. A.
    Gerard, L.
    Gerbig, D.
    Giebels, B.
    Glicenstein, J. F.
    Glueck, B.
    Goret, P.
    Goering, D.
    Hauser, D.
    Hauser, M.
    Heinz, S.
    Heinzelmann, G.
    Henri, G.
    Hermann, G.
    Hinton, J. A.
    Hoffmann, A.
    Hofmann, W.
    Holleran, M.
    Hoppe, S.
    Horns, D.
    Jacholkowska, A.
    de Jager, O. C.
    Jahn, C.
    Jung, I.
    Katarzynski, K.
    Katz, U.
    Kaufmann, S.
    Kendziorra, E.
    Kerschhaggl, M.
    Khangulyan, D.
    Khelifi, B.
    Keogh, D.
    Kluzniak, W.
    Kneiske, T.
    Komin, Nu.
    Kosack, K.
    Lamanna, G.
    Lenain, J. -P
    Lohse, T.
    Marandon, V.
    Martin, J. M.
    Martineau-Huynh, O.
    Marcowith, A.
    Masbou, J.
    Maurin, D.
    McComb, T. J. L.
    Medina, M. C.
    Moderski, R.
    Moulin, E.
    Naumann-Godo, M.
    de Naurois, M.
    Nedbal, D.
    Nekrassov, D.
    Nicholas, B.
    Niemiec, J.
    Nolan, S. J.
    Ohm, S.
    Olive, J. -F
    Wilhelmi, E. de Ona
    Orford, K. J.
    Ostrowski, M.
    Panter, M.
    Arribas, M. Paz
    Pedaletti, G.
    Pelletier, G.
    Petrucci, P. -O
    Pita, S.
    Puehlhofer, G.
    Punch, M.
    Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France.
    Quirrenbach, A.
    Raubenheimer, B. C.
    Raue, M.
    Rayner, S. M.
    Renaud, M.
    Rieger, F.
    Ripken, J.
    Rob, L.
    Rosier-Lees, S.
    Rowell, G.
    Rudak, B.
    Rulten, C. B.
    Ruppel, J.
    Sahakian, V.
    Santangelo, A.
    Schlickeiser, R.
    Schoeck, F. M.
    Schroeder, R.
    Schwanke, U.
    Schwarzburg, S.
    Schwemmer, S.
    Shalchi, A.
    Sikora, M.
    Skilton, J. L.
    Sol, H.
    Spangler, D.
    Stawarz, L.
    Steenkamp, R.
    Stegmann, C.
    Stinzing, F.
    Superina, G.
    Szostek, A.
    Tam, P. H.
    Tavernet, J. -P
    Terrier, R.
    Tibolla, O.
    Tluczykont, M.
    van Eldik, C.
    Vasileiadis, G.
    Venter, C.
    Venter, L.
    Vialle, J. P.
    Vincent, P.
    Vivier, M.
    Voelk, H. J.
    Volpe, F.
    Wagner, S. J.
    Ward, M.
    Zdziarski, A. A.
    Zech, A.
    Discovery of VHE gamma-rays from the BL Lacertae object PKS 0548-3222010In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 521, p. A69-Article in journal (Refereed)
    Abstract [en]

    Aims. PKS 0548-322 (z = 0.069) is a "high-frequency-peaked" BL Lac object and a candidate very high energy (VHE, E > 100 GeV) gamma-ray emitter, due to its high X-ray and radio flux. Observations at the VHE band provide insights into the origin of very energetic particles present in this source and the radiation processes at work. Methods. We report observations made between October 2004 and January 2008 with the HESS array, a four imaging atmospheric-Cherenkov telescopes. Contemporaneous UV and X-ray observations with the Swift satellite in November 2006 are also reported. Results. PKS 0548-322 is detected for the first time in the VHE band with HESS We measure an excess of 216 gamma-rays corresponding to a significance of 5.6 standard deviations. The photon spectrum of the source is described by a power-law, with a photon index of Gamma = 2.86 +/- 0.34(stat) +/- 0.10(sys). The integral flux above 200 GeV is similar to 1.3% of the flux of the Crab Nebula, and is consistent with being constant in time. Contemporaneous Swift/XRT observations reveal an X-ray flux between 2 and 10 keV of F2-10 keV = (2.3 +/- 0.2) x 10(-11) erg cm(-2) s(-1), an intermediate intensity state with respect to previous observations. The spectral energy distribution can be reproduced using a simple one-zone synchrotron self Compton model, with parameters similar those observed for other sources of this type.

  • 749. Aharonian, F.
    et al.
    Akhperjanian, A. G.
    Anton, G.
    de Almeida, U. Barres
    Bazer-Bachi, A. R.
    Becherini, Yvonne
    Behera, B.
    Benbow, W.
    Bernloehr, K.
    Boisson, C.
    Bochow, A.
    Borrel, V.
    Braun, I.
    Brion, E.
    Brucker, J.
    Brun, P.
    Buehler, R.
    Bulik, T.
    Buesching, I.
    Boutelier, T.
    Carrigan, S.
    Chadwick, P. M.
    Charbonnier, A.
    Chaves, R. C. G.
    Cheesebrough, A.
    Chounet, L. -M
    Clapson, A. C.
    Coignet, G.
    Dalton, M.
    Daniel, M. K.
    Degrange, B.
    Deil, C.
    Dickinson, H. J.
    Djannati-Atai, A.
    Domainko, W.
    Drury, L. O 'C.
    Dubois, F.
    Dubus, G.
    Dyks, J.
    Dyrda, M.
    Egberts, K.
    Emmanoulopoulos, D.
    Espigat, P.
    Farnier, C.
    Feinstein, F.
    Fiasson, A.
    Foerster, A.
    Fontaine, G.
    Fuessling, M.
    Gabici, S.
    Gallant, Y. A.
    Gerard, L.
    Giebels, B.
    Glicenstein, J. F.
    Glueck, B.
    Goret, P.
    Hauser, D.
    Hauser, M.
    Heinz, S.
    Heinzelmann, G.
    Henri, G.
    Hermann, G.
    Hinton, J. A.
    Hoffmann, A.
    Hofmann, W.
    Holleran, M.
    Hoppe, S.
    Horns, D.
    Jacholkowska, A.
    de Jager, O. C.
    Jung, I.
    Katarzynski, K.
    Katz, U.
    Kaufmann, S.
    Kendziorra, E.
    Kerschhaggl, M.
    Khangulyan, D.
    Khelifi, B.
    Keogh, D.
    Komin, Nu.
    Kosack, K.
    Lamanna, G.
    Lenain, J. -P
    Lohse, T.
    Marandon, V.
    Martin, J. M.
    Martineau-Huynh, O.
    Marcowith, A.
    Maurin, D.
    McComb, T. J. L.
    Medina, M. C.
    Moderski, R.
    Moulin, E.
    Naumann-Godo, M.
    de Naurois, M.
    Nedbal, D.
    Nekrassov, D.
    Niemiec, J.
    Nolan, S. J.
    Ohm, S.
    Olive, J. -F
    Wilhelmi, E. de Ona
    Orford, K. J.
    Ostrowski, M.
    Panter, M.
    Arribas, M. Paz
    Pedaletti, G.
    Pelletier, G.
    Petrucci, P. -O
    Pita, S.
    Puehlhofer, G.
    Punch, M.
    Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France.
    Quirrenbach, A.
    Raubenheimer, B. C.
    Raue, M.
    Rayner, S. M.
    Renaud, M.
    Reimer, O.
    Rieger, F.
    Ripken, J.
    Rob, L.
    Rosier-Lees, S.
    Rowell, G.
    Rudak, B.
    Rulten, C. B.
    Ruppel, J.
    Sahakian, V.
    Santangelo, A.
    Schlickeiser, R.
    Schoeck, F. M.
    Schroeder, R.
    Schwanke, U.
    Schwarzburg, S.
    Schwemmer, S.
    Shalchi, A.
    Skilton, J. L.
    Sol, H.
    Spangler, D.
    Stawarz, L.
    Steenkamp, R.
    Stegmann, C.
    Superina, G.
    Tam, P. H.
    Tavernet, J. -P
    Terrier, R.
    Tibolla, O.
    van Eldik, C.
    Vasileiadis, G.
    Venter, C.
    Venter, L.
    Vialle, J. P.
    Vincent, P.
    Vivier, M.
    Voelk, H. J.
    Volpe, F.
    Wagner, S. J.
    Ward, M.
    Zdziarski, A. A.
    Zech, A.
    Detection of very high energy radiation from HESS J1908+063 confirms the Milagro unidentified source MGRO J1908+062009In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 499, no 3, p. 723-728Article in journal (Refereed)
    Abstract [en]

    Aims. Detection of gamma-ray source above 300 GeV is reported, confirming the unidentified source MGRO J1908+06, discovered by the Milagro collaboration at a median energy of 20 TeV. Methods. The source was observed during 27 h as part of the extension of the HESS Galactic plane survey to longitudes > 30 degrees. Results. HESS J1908+063 is detected at a significance level of 10.9 sigma with an integral flux above 1 TeV of (3.76 +/- 0.29 (stat) +/- 0.75(sys)) x 10(-12) ph cm(-2) s(-1), and a spectral photon index Gamma = 2.10 +/- 0.07 (stat) +/- 0.2(sys). The positions and fluxes of HESS J1908+063 and MGRO J1908+06 are in good agreement. Possible counterparts at other wavelengths and the origin of the gamma-ray emission are discussed. The nearby unidentified GeV source, GRO J1908+0556 (GeV) which also remains unidentified and the new Fermi pulsar 0FGL J1907.5+0617, may be connected to the TeV source.

  • 750. Aharonian, F.
    et al.
    Akhperjanian, A. G.
    Anton, G.
    de Almeida, U. Barres
    Bazer-Bachi, A. R.
    Becherini, Yvonne
    Univ Paris 07, CNRS, UMR 7164, CEA,Observ Paris, F-75205 Paris 13, France.
    Behera, B.
    Benbow, W.
    Bernloehr, K.
    Boisson, C.
    Bochow, A.
    Borrel, V.
    Brion, E.
    Brucker, J.
    Brun, P.
    Buehler, R.
    Bulik, T.
    Buesching, I.
    Boutelier, T.
    Chadwick, P. M.
    Charbonnier, A.
    Chaves, R. C. G.
    Cheesebrough, A.
    Chounet, L. -M
    Clapson, A. C.
    Coignet, G.
    Costamante, L.
    Dalton, M.
    Daniel, M. K.
    Davids, I. D.
    Degrange, B.
    Deil, C.
    Dickinson, H. J.
    Djannati-Atai, A.
    Domainko, W.
    Drury, L. O 'C.
    Dubois, F.
    Dubus, G.
    Dyks, J.
    Dyrda, M.
    Egberts, K.
    Emmanoulopoulos, D.
    Espigat, P.
    Farnier, C.
    Feinstein, F.
    Fiasson, A.
    Foerster, A.
    Fontaine, G.
    Fuessling, M.
    Gabici, S.
    Gallant, Y. A.
    Gerard, L.
    Giebels, B.
    Glicenstein, J. F.
    Glueck, B.
    Goret, P.
    Goehring, D.
    Hauser, D.
    Hauser, M.
    Heinz, S.
    Heinzelmann, G.
    Henri, G.
    Hermann, G.
    Hinton, J. A.
    Hoffmann, A.
    Hofmann, W.
    Holleran, M.
    Hoppe, S.
    Horns, D.
    Jacholkowska, A.
    de Jager, O. C.
    Jahn, C.
    Jung, I.
    Katarzynski, K.
    Katz, U.
    Kaufmann, S.
    Kendziorra, E.
    Kerschhaggl, M.
    Khangulyan, D.
    Khelifi, B.
    Keogh, D.
    Kluzniak, W.
    Kneiske, T.
    Komin, Nu.
    Kosack, K.
    Lamanna, G.
    Lenain, J. -P
    Lohse, T.
    Marandon, V.
    Martin, J. M.
    Martineau-Huynh, O.
    Marcowith, A.
    Maurin, D.
    McComb, T. J. L.
    Medina, M. C.
    Moderski, R.
    Monard, L. A. G.
    Moulin, E.
    Naumann-Godo, M.
    de Naurois, M.
    Nedbal, D.
    Nekrassov, D.
    Niemiec, J.
    Nolan, S. J.
    Ohm, S.
    Olive, J. -F
    Wilhelmi, E. de Ona
    Orford, K. J.
    Ostrowski, M.
    Panter, M.
    Arribas, M. Paz
    Pedaletti, G.
    Pelletier, G.
    Petrucci, P-O
    Pita, S.
    Puehlhofer, G.
    Punch, M.
    Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France.
    Quirrenbach, A.
    Raubenheimer, B. C.
    Raue, M.
    Rayner, S. M.
    Renaud, M.
    Rieger, F.
    Ripken, J.
    Rob, L.
    Rosier-Lees, S.
    Rowell, G.
    Rudak, B.
    Rulten, C. B.
    Ruppel, J.
    Sahakian, V.
    Santangelo, A.
    Schlickeiser, R.
    Schoeck, F. M.
    Schroeder, R.
    Schwanke, U.
    Schwarzburg, S.
    Schwemmer, S.
    Shalchi, A.
    Sikora, M.
    Skilton, J. L.
    Sol, H.
    Spangler, D.
    Stawarz, L.
    Steenkamp, R.
    Stegmann, C.
    Superina, G.
    Szostek, A.
    Tam, P. H.
    Tavernet, J. -P
    Terrier, R.
    Tibolla, O.
    Tluczykont, M.
    Van Eldik, C.
    Vasileiadis, G.
    Venter, C.
    Venter, L.
    Vialle, J. P.
    Vincent, P.
    Vivier, M.
    Voelk, H. J.
    Volpe, F.
    Wagner, S. J.
    Ward, M.
    Zdziarski, A. A.
    Zech, A.
    Simultaneous multiwavelength observations of the second exceptional gamma-ray flare of PKS2155-304 in July 20062009In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 502, no 3, p. 749-770Article, review/survey (Refereed)
    Abstract [en]

    Aims. The X-ray-TeV connection and the evolution of the emitting particle population is studied in high-energy peaked BL Lac objects, by obtaining spectral information in both bands on sub-hour timescales. Methods. Simultaneous observations with HESS, Chandra and the Bronberg optical observatory were performed on the BL Lac object PKS 2155-304 in the night of July 29-30 2006, when the source underwent a major gamma-ray outburst during its high-activity state of Summer 2006. This event took place about 44 h after the other major outburst of the night of July 27-28, which is known for its ultrafast variability. An unprecedented 6 to 8 h of simultaneous, uninterrupted coverage was achieved, with spectra and light curves measured down to 7 and 2 min timescales, respectively. Results. The source exhibited one major flare along the night, at high energies. The gamma-ray flux reached a maximum of similar to 11 times the Crab flux (>400 GeV), with rise/decay timescales of similar to 1 h, plus a few smaller-amplitude flares superimposed on the decaying phase. The emission in the X-ray and VHE gamma-ray bands is strongly correlated, with no evidence of lags. The spectra also evolve with similar patterns, and are always soft ( photon index G > 2), indicating no strong shift of the peaks in the spectral energy distribution towards higher energies. Only at the flare maximum is there evidence that the gamma-ray peak is inside the observed passband, at similar to 400-600 GeV. The VHE spectrum shows a curvature that is variable with time and stronger at higher fluxes. The huge VHE variations (similar to 22x) are only accompanied by small-amplitude X-ray and optical variations (factor 2 and 15% respectively). The source has shown for the first time in a high-energy peaked BL Lac object a large Compton dominance (L(C)/L(S) similar to 10) - rapidly evolving - and a cubic relation between VHE and X-ray flux variations, during a decaying phase. These results challenge the common scenarios for the TeV-blazar emission.

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