Thesis advisor: Fazel Tafti / The search for an ideal quantum spin-liquid (QSL) material which can host a QSL ground state as well as exotic excitations has been one of the leading research topics in condensed matter physics over the past few decades. Out of all the proposals to realize the physics of a QSL, the Kitaev model is the most promising proposal with a QSL ground state. The Kitaev Hamiltonian is exactly solvable via fractionalization of its spin degrees of freedom into Majorana excitations, and it can be engineered in real materials. Among all the proposed Kitaev candidates, α-Li2IrO3, Na2IrO3, Li2RhO3, and α-RuCl3 are the most promising candidates. During my Ph.D. research I explored new physics related to Kitaev materials via modification of the symmetry and structural properties of these known Kitaev candidates. First, I studied how modification of the inter-layer chemistry can alter the thermodynamic properties of Kitaev candidate α-Li2IrO3 via an enhancement of the spin-orbit coupling (SOC) effect. The light, octahedrally-coordinated inter-layer Li atoms are replaced with heavier, linearly-coordinated Ag atoms to synthesize Ag3LiIr2O6. In addition to these structural modifications to the parent compound α-Li2IrO3, having heavier elements between the honeycomb layers in the Ag compound increased the effect of SOC in the honeycomb layers and led to a decrease in the long-range ordering temperature in Ag3LiIr2O6 compared to its parent compound. Second, I studied the effect of local crystal distortion in the presence of a weak SOC effect to explore a new spin-orbital state different from the Jeff=1/2 state. Based on theoretical predictions, the ground states of Kitaev materials can be tuned to other exotic spin-orbital states such as an Ising spin-1/2 state. To provide the proper conditions for a competition between the trigonal crystal distortion and the SOC effect, I modified the crystal environment around the magnetic elements in the parent compound Li2RhO3 via a topo-chemical method and synthesized Ag3LiRh2O6. An increase in the strength of trigonal distortion in Ag3LiRh2O6, in the presence of weak SOC, led to a transition from the Jeff=1/2 ground state (Kitaev limit) in the parent compound to an Ising spin-1/2 ground state (Ising limit) in the product. This change in spin-orbital state resulted in a dramatic change in magnetic behavior. Whereas Li2RhO3 shows a spin-freezing transition at 6 K, Ag3LiRh2O6 reveals a robust long-range antiferromagnetic transition at 94 K. This is the first realization of a change of ground state between the Kitaev and Ising limits in the same structural family. Lastly, I studied how the crystal symmetry can be an important factor in the physics of Kitaev materials. Honeycomb layered materials can be crystallized in space groups C2/m, C2/c, and P6_322. However, the crystal symmetry of most Kitaev candidates is described by the C2/m space group. We successfully synthesized a polymorph of a 3d Kitaev candidate, hexagonal Na2Co2TeO6 (P6_322 space group) in space group C2/m. The change in crystal symmetry of this cobalt tellurate replaced three anti-ferromagnetic (AFM) orders at 27, 15, 7 K in the hexagonal polymorph by a single AFM peak at 9.6 K in the monoclinic Na2Co2TeO6. / Thesis (PhD) — Boston College, 2023. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Physics.

Vid deltagande i internationella insatser kan Flygvapnet komma att möta nya typer av hot som Flygvapnet tidigare inte stött på, vilket medför att en anpassning eller förändring av flygtaktiken är en förutsättning för att undvika flygplansskador. 2000-talets lättviktflygplan medför en skyddsnivå på flygplanen som är låg och motståndaren kan påverka materialet samt konstruktionen i flygplanen genom beskjutning med finkalibriga projektiler. Syftet med uppsatsen är att analysera hur den nya hotbilden skiljer sig från vad Flygvapnet ställs inför nationellt samt analysera hur finkalibrig eld påverkar kompositmaterial och hur det i sig påverkar flygtaktiken. Inledningsvis utgår jag i uppsatsen från en beskrivande metod av empirin i syfte att läsaren skall få förståelse samt bakgrund inom de belysta ämnena för att förstå det som senare diskuteras i uppsatsen. Därefter övergå uppsatsen till en hotbildsanalys i syfte att senare diskutera och dra slutsatser om hur flygtaktiken bör anpassas för internationella insatser. I slutsatsen har jag kommit fram till att finkalibrig elds påverkan på kompositmaterial är mycket effektiv vilket innebär att projektilen slår igenom och deformerar materialet. Vidare diskuteras alternativ till genomförande av start och landning för att minska exponeringstiden och undvika att motståndaren kan påverka flygplanen. / While participating in international missions, the Swedish Air force may encounter new kinds of threats. This result in a needed adaptation or change in flight tactics to avoid aircraft damage. The light weight plans of the 21th century have a low degree of protection and the opponent can affect the material and construction with small arms. The purposes of this essay is to analyze how the new threats differ from what the Swedish Air force faces on a national level, and also analyze how small arms affects composite and in turn affects the flight tactics. I have initially used a descriptive method of the empiri and thereafter I used an analytic method in order to later on discuss and finding a conclusion on how the flight tactics need to be adapted and changed for international missions. In the conclusion I found that low caliber fire affects the composite material in a high degree, which means that the projectile will deform, disfigure and go straight through the material. I also discuss alternatives for the takeoff and landing procedures in a way that will reduce the exposure time and avoid the affects that the opponents can make on the aircraft.

Работа посвящена изучению коммуникативных стратегий, применяемых на сайтах университетов с целью формирования сетевой идентичности. Материалами в рамках настоящего являются креолизованные тексты, размещенные на официальных веб-сайтах Уральского федерального университета (Россия), Университета Страсбурга (Франция), Университета Валенсии (Испания). Объектом исследования выступает компьютерно-опосредованная коммуникация на официальных сайтах университетов. Целью данного исследования является выявление наиболее применяемых и эффективных для взаимодействия с целевой аудиторией коммуникативных стратегий и тактик самопрезентации, используемых вузами для конструирования собственной идентичности в интернет-дискурсе в рамках официального сайта. В первой части работы рассматриваются необходимые для исследования теоретические понятия: компьютерно-опосредованная коммуникация, интернет-дискурс. Далее определяется портфолио коммуникативных стратегий самопрезентации для поиска и последующего исследования и выделяются принципы создания успешного сайта-бренда. Во второй части работы описываются критерии отбора исследуемых вузов, а также проводится исследование текстов, размещенных на двух версиях каждого из сайта (версии на английском языке и на родном для страны, где находится вуз). По результатам данного анализа были составлены диаграммы, демонстрирующие различия в применении той или иной стратегии в двух версиях каждого сайта. Анализ показал, что наиболее распространенными по количеству применений являются стратегии, реализуемые при помощи тактик диалогизации дискурса через обращение к читателю посредством личных местоимений, а также направленные на поддержание непрерывного взаимодействия с ним. В приложении приводятся таблицы, содержащие фрагменты текстов с применением исследуемых коммуникативных стратегий. / The work is dedicated to studying the communicative strategies used on university websites to shape their online identity. The materials used for this study are creolized texts found on the official websites of the Ural Federal University (Russia), the University of Strasbourg (France), and the University of Valencia (Spain). The object of research is computer-mediated communication on the official websites of universities. The aim of this research is to identify the most commonly used and effective communicative strategies and self-presentation tactics employed by universities to construct their own identity within the online discourse of their official websites. The first part of the work explores the necessary theoretical concepts, such as computer-mediated communication and online discourse. It then defines a portfolio of communicative self-presentation strategies for the purpose of searching and subsequent investigation, while highlighting the principles of creating a successful brand website. The second part of the work describes the criteria for selecting the universities under investigation and conducts an analysis of the texts published on two versions of each website (the English version and the version in the native language of the country where the university is located). Based on the results of this analysis, diagrams were compiled to demonstrate the differences in the application of various strategies between the two versions of each website. The analysis revealed that the most commonly used strategies, in terms of frequency, are those implemented through discourse dialogization, achieved by directly addressing the reader using personal pronouns, as well as strategies aimed at maintaining continuous interaction with the reader. The appendix includes tables containing parts of the texts illustrating the application of the researched communicative strategies.

Un animal qui s’approvisionne en groupe peut rechercher soi-même sa nourriture (tactique producteur) ou tenter de se joindre à des parcelles déjà découvertes par un autre individu (tactique chapardeur). Bien que les modèles de jeu producteur-chapardeur partent du principe que les gains moyens à l’équilibre associés à chacune de ces tactiques sont égaux et ne dépendent pas des caractéristiques des individus, de plus en plus d’études démontrent que le gain de chaque tactique est influencé par certaines caractéristiques phénotypiques (agressivité, capacités d’apprentissage,…). Dans cette étude, nous nous intéressons aux effets de la testostérone sur le choix des tactiques d’approvisionnement chez les mâles de diamant mandarin (Taeniopygia guttata). La testostérone est connue pour influencer le développement du cerveau et l’agressivité, nous avons donc testé les effets d’une exposition prénatale à la testostérone ainsi que durant l’âge adulte sur le choix des tactiques d’approvisionnement lorsque la nourriture est cryptique ou défendable. Nous avons réalisé deux expériences : nous avons tout d’abord utilisé la longueur du tarse ainsi que la différence entre les longueurs des doigts 2 et 4 comme des indicateurs de l’exposition prénatale à la testostérone puis testé si ces différences morphologiques se traduisent par des différences dans le choix des tactiques dans une condition défendable et une condition cryptique. Nous avons trouvé que le choix des tactiques chez les diamants mandarins était limité par le phénotype. Une exposition précoce à la testostérone au cours du développement prénatal pourrait donc être la cause d’au moins une part de la variation observée dans le choix des tactiques d’approvisionnement. Ensuite, nous avons manipulé le taux de testostérone plasmatique chez des mâles adultes grâce à des implants hormonaux sous-cutanés puis comparé le comportement des individus lorsqu’ils portaient un implant hormonal et un implant contrôle et ce, dans chacune des deux conditions d’approvisionnement. Nous n’avons mis en évidence aucun effet du taux de testostérone plasmatique sur le choix des tactiques à l’âge adulte. Nos résultats sont en accord avec l’hypothèse que le choix des tactiques d’approvisionnement peut être influencé par les hormones. Notre conclusion est que les hormones stéroïdiennes peut affecter le choix des tactiques via l’existence d’effets maternels dans le jeu producteur-chapardeur. / An animal foraging in groups can search for its own food (producer tactic) or try to join food patches previously discovered by another group member (scrounger tactic). Although producer-scrounger game models assume that the payoffs associated with both tactic are equal at equilibrium and so do not depend on individual characteristics, there is recent evidence that tactic choice is constrained by certain phenotypical traits (aggressivity, learning abilities…). In this study, we examined the effect of testosterone on tactic use in male zebra finches (Taeniopygia guttata). Because testosterone is known to affect both brain development and aggressiveness, we tested whether differences in testosterone exposure either during development or in adulthood had an effect on producer-scrounger tactic use, when food was cryptic or defendable. First, we measured the tarsus length and the distance between the end of the fourth and the end of the second digit as proxies of prenatal exposure to testosterone, and tested whether they were correlated with foraging tactic use under both conditions. We found that tactic choice in zebra finches is phenotypically constrained. We suggest that early exposure to sex hormones during the embryonic period could be responsible for at least a part of the variation in tactic choice. Second, we manipulated the circulating level of testosterone in adult male zebra finches using subcutaneous testosterone implants, and compared the behavior of individuals when they had either a control implant or a testosterone implant. This time we found no effect of plasmatic level of testosterone on tactic choice. Our results are consistent with the hypothesis that tactic choice in zebra finches could be mediated by hormones. Our finding that steroid hormones can affect tactic use provides evidence for maternal effects in producer-scrounger games.

Title: Training technical - tactical site of volleyball players in youth categories Aims: The aim of my dissertation is to to create a battery of drills and exercises technical and tactical game activities of the individual sites and compare results before and after the three-month specialized training. The task is to collect knowledge about technical skills and tactic in volleyball and their development by young players by studying appropriate literature. The next task is to accumulate a resource of preparatory and game exercise as well as preparatory games, which contribute to the development of technical skills and tactic and the coach this exercise involved in training at least once a week for three months. And comparing the results of input and output measurements, which will assess the individual player skills in the technical and tactical skills and combinations. Methods: 1. analysis of literary sources 2. description of collected knowledge 3. interpretation of literary knowledge into praktice 4. watching the players and the comparative method to evaluate the development of performance players (cadet) in the technical - tactical tests Outcome: Knowledge about the characteristics of technical skills and tactic and their development in practice and training of young volleyball players. To...

A investigação de variáveis sintáticas e morfossintáticas dentro do quadro da Sociolinguística Varicionista tem recebido, em geral, menor atenção do que o estudo de variáveis fonológicas. Este trabalho analisa a variação entreo quatro estruturas de Interrogativas-Q em amostras de fala e de escrita do português paulistano contemporâneo: (i) interrogativas-qu (\"Onde você mora?\"); (ii) interrogativas qu-que (\"Onde que você mora?\"); (iii)interrogativas é que (\"Onde é que você mora?\"); e (iv) interrogativas qu-in-situ (\"Você mora onde?\"). A equivalência semântica entre as formas interrogativas se estabelece através do conceito de pressuposição do falante (Stalnaker, 2002). Além disso, este trabalho propõe o conceito de competência comunicativa (Hymes, 1991[1979]) como critério para determinar o envelope de variação: diferentes estruturas são consideradas variantes se forem factualmente possíveis, factíveis, adequadas e empregadas nos mesmos contextos. A análise qualitativa com base nesses conceitos define dois envelopes de variação-e, portanto, duas variáveis: uma que envolve a alternância na posição do constituinte interrogativo (in situ ou não), e outra que encerra as três estruturas com constituinte interrogativo pré-verbal (-qu, qu-que e é-que). Os resultados das análises quantitativas mostram que interrogativas qu-in-situ são favorecidas principalmente por fatores morfossintáticos e discursivo-pragamáticos; fatores extralinguísticos, como sexo/genêro e a faixa etária do falante , também se correlacionam indiretamente através do emprego de diferentes discursivas. O uso de interrogativas qu-que, por sua vez, demonstra uma provável mudança linguística em progresso, uma vez que a análise em tempo aparente revela o favorecimento da estrutura por falantes mais jovens. Neste caso, a variação é influenciada principalmente por fatores sintáticos e prosódicos. Além de propor critérios para o estudo de variáveis morfossintáticas, este trabalho discute os resultados das análises quantitativas em perspectiva com outros níveis de variação linguística, com vistas a integra-los em um quadro mais amplo da Teoria da Variação. / The investigation of syntactic and morphosyntactic variables within the framework of Variationist ociolinguistics has received, in general, less attention than the study of phonological variables. This study analyses variation amaong four different structures of Wh-interrogatives in the speech and writing of native paulistanos: (i) \'simple\'wh-interrogatives (as in Onde você mora? \'Where you live?\'); (ii) wh-que interrogatives ( as in Onde você mora? \'Where-that you live?\'); (iii) cleft wh-interrogatives (as in Onde é que você mora? \'Where is-it that you live?\'); and (iv) wh-in-situ (as in Você mora onde? \'You live where?\'). Semantic equivalence among the four structures is established through the concept of speaker\'s pressupposition (Stalnaker, 2002). Further, this study proposes the concept of communicative competence (Hymes, 1991 [1979]) as a criterium for determining the envelope of variation: different structures are considered variants if they are factually possible, feasible, appropriate, and performed in the same contexts. The qualitative analysis based on these concepts defines two different envelopes of variation - hence, two variables: one which involves the alternation in the position of the wh-word (in situ vs. moved), and another which comises the three structures with a moved wh-word (\'simple\', wh-que and cleft -wh). Results of the quantitative analyses show that wh-in-situ is mostly favored by morphosyntactic and discourse-pragmatic factors, and that non-linguistic factor groups such as gender and age are also indirectly correlated with the variantion through the use of different discourse strategies. The use of wh-que, on the other hand, is probably undergoing change, as apparent time analyses show a avoring effect by younger speakers. Variation in this case is mostly influenced by syntactic and prosodic factors. In addition to proposing criteria to the study of morphosyntactic variables, this dissertation discusses the results of the quantitative analyses in relation to other levels of linguistic variation, aiming at their integration into a larger framework of Variotion Theory.

A investigação de variáveis sintáticas e morfossintáticas dentro do quadro da Sociolinguística Varicionista tem recebido, em geral, menor atenção do que o estudo de variáveis fonológicas. Este trabalho analisa a variação entreo quatro estruturas de Interrogativas-Q em amostras de fala e de escrita do português paulistano contemporâneo: (i) interrogativas-qu (\"Onde você mora?\"); (ii) interrogativas qu-que (\"Onde que você mora?\"); (iii)interrogativas é que (\"Onde é que você mora?\"); e (iv) interrogativas qu-in-situ (\"Você mora onde?\"). A equivalência semântica entre as formas interrogativas se estabelece através do conceito de pressuposição do falante (Stalnaker, 2002). Além disso, este trabalho propõe o conceito de competência comunicativa (Hymes, 1991[1979]) como critério para determinar o envelope de variação: diferentes estruturas são consideradas variantes se forem factualmente possíveis, factíveis, adequadas e empregadas nos mesmos contextos. A análise qualitativa com base nesses conceitos define dois envelopes de variação-e, portanto, duas variáveis: uma que envolve a alternância na posição do constituinte interrogativo (in situ ou não), e outra que encerra as três estruturas com constituinte interrogativo pré-verbal (-qu, qu-que e é-que). Os resultados das análises quantitativas mostram que interrogativas qu-in-situ são favorecidas principalmente por fatores morfossintáticos e discursivo-pragamáticos; fatores extralinguísticos, como sexo/genêro e a faixa etária do falante , também se correlacionam indiretamente através do emprego de diferentes discursivas. O uso de interrogativas qu-que, por sua vez, demonstra uma provável mudança linguística em progresso, uma vez que a análise em tempo aparente revela o favorecimento da estrutura por falantes mais jovens. Neste caso, a variação é influenciada principalmente por fatores sintáticos e prosódicos. Além de propor critérios para o estudo de variáveis morfossintáticas, este trabalho discute os resultados das análises quantitativas em perspectiva com outros níveis de variação linguística, com vistas a integra-los em um quadro mais amplo da Teoria da Variação. / The investigation of syntactic and morphosyntactic variables within the framework of Variationist ociolinguistics has received, in general, less attention than the study of phonological variables. This study analyses variation amaong four different structures of Wh-interrogatives in the speech and writing of native paulistanos: (i) \'simple\'wh-interrogatives (as in Onde você mora? \'Where you live?\'); (ii) wh-que interrogatives ( as in Onde você mora? \'Where-that you live?\'); (iii) cleft wh-interrogatives (as in Onde é que você mora? \'Where is-it that you live?\'); and (iv) wh-in-situ (as in Você mora onde? \'You live where?\'). Semantic equivalence among the four structures is established through the concept of speaker\'s pressupposition (Stalnaker, 2002). Further, this study proposes the concept of communicative competence (Hymes, 1991 [1979]) as a criterium for determining the envelope of variation: different structures are considered variants if they are factually possible, feasible, appropriate, and performed in the same contexts. The qualitative analysis based on these concepts defines two different envelopes of variation - hence, two variables: one which involves the alternation in the position of the wh-word (in situ vs. moved), and another which comises the three structures with a moved wh-word (\'simple\', wh-que and cleft -wh). Results of the quantitative analyses show that wh-in-situ is mostly favored by morphosyntactic and discourse-pragmatic factors, and that non-linguistic factor groups such as gender and age are also indirectly correlated with the variantion through the use of different discourse strategies. The use of wh-que, on the other hand, is probably undergoing change, as apparent time analyses show a avoring effect by younger speakers. Variation in this case is mostly influenced by syntactic and prosodic factors. In addition to proposing criteria to the study of morphosyntactic variables, this dissertation discusses the results of the quantitative analyses in relation to other levels of linguistic variation, aiming at their integration into a larger framework of Variotion Theory.

同志身分常常是許多同志鎖在衣櫃裡的另一面貌，同志污名標籤令同志在日常生活中，必須管理有關同志身分的身分訊息，以免他人以偏見看待。然而衣櫃卻也有著男櫃與女櫃的差別，女同志在社會中承受的污名處境與男同志並不相同，所擁有的資源與權力也不一樣。相較男同志，女同志有著女性與同志的雙重弱勢身分。 近年來世界各地出現愈來愈多透過臉書賦權的例子，臉書使人們更容易自行組織動員，賦予人們更多政治權力上的能動性。在各式各樣透過臉書賦權的行動中，亦包含少數族群污名化標籤的去除與對抗歧視。對於在主流異性戀社會體制處於性別弱勢的女同志族群來說，藉由臉書反轉污名標籤，或是試圖在臉書上管控自身的同志身分訊息，皆使得女同志在日常生活中與他人的互動，有了別於以往的改變。 本研究從日常生活中的人際互動秩序切入，探究女同志的臉書使用策略。企圖理解臉書如何成為女同志族群遊走權力縫隙的工具，甚至被女同志使用者挪用作為抗衡異性戀主流霸權的策略。研究的目的在於挖掘女同志族群使用臉書的期待、想法與使用感受；以及女同志族群如何透過臉書達成使用臉書的目的――有著哪些使用策略、挪用與棄用的情形。 研究採用質化研究取向，使用深度訪談法，並蒐集紀錄同志的臉書使用文本，交互分析論證。以日常生活理論中Lefebvre的節慶狂歡概念與de Certeau弱者的力量，闡述臉書女同志使用者，如何透過戰術創造機會，並對結構展現出自身的能動性。 研究發現臉書作為呈現日常生活樣貌的平台，反映的是日常生活中綿密交織的各式權力秩序。臉書的女同志使用者在多元的臉書使用策略中，展現與社會監視機制抗衡的企圖，並試圖對異性戀霸權結構秩序形成擾動。女同志族群透過臉書平台具有的隱私控制系統，作為策略使用的主要機制。以臉書上的朋友名單篩選與分類臉書朋友、曖昧模糊的文字內容、大量按讚與轉貼分享偷渡同志議題等方式，自行定義生命中的重要事件與場景，讓詮釋、定義女同志的權力，下放至女同志手中。 / Because of the homosexual stigma, LGBT have to hide their sexual orientation to keep away from discrimination. Lesbians and gays face different social stigmas and the power and social resources they enjoy are not the same. Lesbians, as women and homosexuals at the same time, are more disadvantaged than gays in the society. There are more and more people who empower themselves through Facebook. The empowerment movements on Facebook include reversing the stigma and combating against the discrimination. Lesbians use Facebook as a tool to reverse the stigma against them and they could decide whether to reveal their social identities on Facebook. Thus, Facebook has changed lesbians’ daily interaction with others. Based on the theories about ‘everyday life’ suggested by Lefebvre and de Certeau, this study will explain how lesbians use Facebook to overcome limitations in their daily lives. The findings suggest that, rather than breaking the social norms, lesbians establish a ‘Friend List’ on Facebook to categorize their friends. By using this strategy, lesbians try to undermine the heterosexual hegemony which governs their lives. The tatics that applied by lesbians while using Facebook are not only influenced by the features of Facebook, but also affected by the social and cultural context and power relations.

Un animal qui s’approvisionne en groupe peut rechercher soi-même sa nourriture (tactique producteur) ou tenter de se joindre à des parcelles déjà découvertes par un autre individu (tactique chapardeur). Bien que les modèles de jeu producteur-chapardeur partent du principe que les gains moyens à l’équilibre associés à chacune de ces tactiques sont égaux et ne dépendent pas des caractéristiques des individus, de plus en plus d’études démontrent que le gain de chaque tactique est influencé par certaines caractéristiques phénotypiques (agressivité, capacités d’apprentissage,…). Dans cette étude, nous nous intéressons aux effets de la testostérone sur le choix des tactiques d’approvisionnement chez les mâles de diamant mandarin (Taeniopygia guttata). La testostérone est connue pour influencer le développement du cerveau et l’agressivité, nous avons donc testé les effets d’une exposition prénatale à la testostérone ainsi que durant l’âge adulte sur le choix des tactiques d’approvisionnement lorsque la nourriture est cryptique ou défendable. Nous avons réalisé deux expériences : nous avons tout d’abord utilisé la longueur du tarse ainsi que la différence entre les longueurs des doigts 2 et 4 comme des indicateurs de l’exposition prénatale à la testostérone puis testé si ces différences morphologiques se traduisent par des différences dans le choix des tactiques dans une condition défendable et une condition cryptique. Nous avons trouvé que le choix des tactiques chez les diamants mandarins était limité par le phénotype. Une exposition précoce à la testostérone au cours du développement prénatal pourrait donc être la cause d’au moins une part de la variation observée dans le choix des tactiques d’approvisionnement. Ensuite, nous avons manipulé le taux de testostérone plasmatique chez des mâles adultes grâce à des implants hormonaux sous-cutanés puis comparé le comportement des individus lorsqu’ils portaient un implant hormonal et un implant contrôle et ce, dans chacune des deux conditions d’approvisionnement. Nous n’avons mis en évidence aucun effet du taux de testostérone plasmatique sur le choix des tactiques à l’âge adulte. Nos résultats sont en accord avec l’hypothèse que le choix des tactiques d’approvisionnement peut être influencé par les hormones. Notre conclusion est que les hormones stéroïdiennes peut affecter le choix des tactiques via l’existence d’effets maternels dans le jeu producteur-chapardeur. / An animal foraging in groups can search for its own food (producer tactic) or try to join food patches previously discovered by another group member (scrounger tactic). Although producer-scrounger game models assume that the payoffs associated with both tactic are equal at equilibrium and so do not depend on individual characteristics, there is recent evidence that tactic choice is constrained by certain phenotypical traits (aggressivity, learning abilities…). In this study, we examined the effect of testosterone on tactic use in male zebra finches (Taeniopygia guttata). Because testosterone is known to affect both brain development and aggressiveness, we tested whether differences in testosterone exposure either during development or in adulthood had an effect on producer-scrounger tactic use, when food was cryptic or defendable. First, we measured the tarsus length and the distance between the end of the fourth and the end of the second digit as proxies of prenatal exposure to testosterone, and tested whether they were correlated with foraging tactic use under both conditions. We found that tactic choice in zebra finches is phenotypically constrained. We suggest that early exposure to sex hormones during the embryonic period could be responsible for at least a part of the variation in tactic choice. Second, we manipulated the circulating level of testosterone in adult male zebra finches using subcutaneous testosterone implants, and compared the behavior of individuals when they had either a control implant or a testosterone implant. This time we found no effect of plasmatic level of testosterone on tactic choice. Our results are consistent with the hypothesis that tactic choice in zebra finches could be mediated by hormones. Our finding that steroid hormones can affect tactic use provides evidence for maternal effects in producer-scrounger games.

Title: Critical Success Factors for Integration of Enterprise Resource Planning System   Level: Student thesis, final assignment for Master Degree (one year) in Business Administration   Author: Kambiz Kafi   Supervisor: Dr. Maria Fregidou-Malama   Examiner: Dr. Ehsanul Huda Chowdhury   Date: 2018-11-26   Aim: This study examines the Critical Success Factor (CSF) model and its implementation in a case study where ERP Systems are integrated. The model includes Legacy System as a CSF.   Method: Deductive reasoning and case study were applied to support the research theory. Primary and secondary data were collected. Interviews with managers and staffs were performed.   Result & Conclusions: The study shows the factors that are critical in successful implementation of ERP project and how a successful implementation and integration of ERP projects is executed when two companies are being merged. It also shows how the ERP integration project can be implemented. This work studied an implementation of Holland and Light’s theoretical CSF model empirically and validated that the model is general and robust for successful ERP implementation and managing changes.   Contribution of the research: This study of integration of few Legacy Systems when companies are being merged is a contribution to the theory of CSF. The central role that Legacy Systems plays in ERP project implementation is shown empirically. This study presents Software Alignment (Software Configuration) based on two company’s business processes empirically and found it to be essential in success of ERP projects. The research shows how CSF model manages changes, assisting managers in merging two companies successfully. The research presents a modified Holland and Light CSF model to meet the merging situations.      Suggestions for future research: To gain more knowledge about CSFs for integration of ERPs, this study suggests further cross- industrial empirical studies in wholesale and retail industries with varied sizes. Research about identifying CFSs in extended ERP using e_CRM is recommended.