Books on the topic 'Zones de stabilité'

The origin of the stability of aperiodic systems is very difficult to answer. Often the terms ‘competitive forces’ or ‘frustration’ have been proposed as the origin of stability. The role of Fermi surfaces and Brillouin zone boundary have also been invoked. This chapter deals with the numerous attempts which have been proposed for a better understanding. First, the Landau theory of phase transition, which has often been applied to understand the stability of incommensurate and composite systems, is presented here. Various semi-microscopic models are also proposed, in particular the Frenkel–Kontorova and Frank–Van der Merwe models, as well as spin models. Phase diagrams have been calculated with some success with the ANNI and DIFFOUR models. For quasicrystals, only the simplest general features are found in model systems. For a better understanding, more complex calculations are required, using, for example, ab initio methods. The chapter also discusses electronic instabilities, charge-density systems, Hume–Rothery compounds, and the growth of quasicrystals.

“Essays in Physics” gives accounts of 32 chosen topics. The level is that of a 3–4-year university course in Physics. The topics discussed are diverse but “mainstream”. Each essay aims to say something fresh that complements what the reader will find elsewhere. Just what “fresh” means inevitably depends somewhat on the subject matter. Some chapters give a “different” slant on a familiar idea (e.g. electromagnetic energy, Lorentz transformation, photon emission). Some contain an analysis not available elsewhere (diffraction, feedback stability). Some correct material that is commonplace in many textbooks (much atomic physics). Some add insightful discussion to standard material (free energy, Brillouin zones). One in particular refines technique (perturbation theory). One brings order to confusion (-m dB). The aim in all cases is to encourage a fuller, and correct, understanding, and an enhanced intellectual acuity (critical faculty). With a subject as mature as physics, it is bold to claim originality. However I will dare to make that claim, in particular for Chapters 10, 22 and 30, but also for parts of most other chapters.

Renewed interest in Swiss history has sought to overcome the old stereotypes of peasant liberty and republican exceptionalism. The heroic age of the Confederation in the fifteenth century is now seen as a turning point as the Swiss polity achieved a measure of institutional consolidation and stability, and began to mark out clear frontiers. This book questions both assumptions. It argues that the administration of the common lordships by the cantons collectively gave rise to as much discord as cooperation, and remained a pragmatic device not a political principle. It argues that the Swiss War of 1499 was an avoidable catastrophe, from which developed a modus vivendi between the Swiss and the Empire as the Rhine became a buffer zone, not a boundary. It then investigates the background to Bern’s conquest of the Vaud in 1536, under the guise of relieving Geneva from beleaguerment, to suggest that Bern’s actions were driven not by predeterminate territorial expansion but by the need to halt French designs upon Geneva and Savoy. The geopolitical balance of the Confederation was fundamentally altered by Bern’s acquisition of the Vaud and adjacent lands. Nevertheless, the political fabric of the Confederation, which had been tested to the brink during the Reformation, proved itself flexible enough to absorb such a major reorientation, not least because what held the Confederation together was not so much institutions as a sense of common identity and mutual obligation forged during the Burgundian Wars of the 1470s.

This book explores how market power competition between states can create disruptions in the global political economy and potentially lead to territorial aggression and war. When a state’s firms have the ability to set prices in a key commodity market like oil or natural gas, state leaders can benefit from increased revenue, stability, and political leverage. Given these potential benefits, states may be motivated to expand their territorial reach in order to gain or maintain such market power. This market power motivation can sometimes lead to war. However, when states are economically interdependent, they may be constrained from using force to achieve their market power goals. This can open up an opportunity for institutional settlements. However, in some cases, institutional rules and procedures can preclude states from reaching a settlement in line with their market power ambitions. When this happens, states may opt for strategic delay and try to gradually accumulate market power over time through salami tactics. To explore how these dynamics play out empirically, the authors examine three cases of market power competition in hard commodity markets: Iraq’s invasion and occupation of Kuwait to seize market power in the oil export market, Russia’s territorial encroachment into Georgia and Ukraine to preserve and expand its market power in the natural gas market, and China’s ongoing use of strategic delay and gray zone tactics in the South and East China Seas to maintain its dominant position in the global market for rare earth elements.

The study is funded by Doha International Family Institute (DIFI), a member of Qatar Foundation, and is a collaboration between the Muslim Resource Centre for Social Support and Integration of London, Ontario; University of Guelph, Ontario; and University of Calgary, Alberta, all located in Canada; and the Doha International Family Institute, Qatar. The study received research ethics approval from the University of Guelph and the University of Calgary. This study aims to assess the impact of pre- and post-migration on marital relationships and family dynamics for Arab refugee families resettled in Canada. The study also examines the role of professional service providers in supporting these Arab refugee families. The unique experiences of Arab families displaced from their countries due to war and political conflict, and the various hardships experienced during their stay in transit countries, impact their family relations and interactions within the nuclear family context and their interconnectedness with their extended families. Furthermore, these families encounter various challenges within their resettlement process that interrupt their integration. Understanding the impact of traumatic experiences within the pre-migration journey as well as the impact of post-migration stressors on recently settled Arab refugee families in Canada provides insight into the shift in spousal and family relationships. Refugee research studies that focus on the impact of pre-migration trauma and displacement, the migration journey, and post-migration settlement on family relationships are scarce. Since the majority of global refugees in recent years come from Arab regions, mainly Syria, as a result of armed conflicts, this study is focused on the unique experiences of Arab refugee families fleeing conflict zones. The Canadian role in recently resettling a large influx of Arab refugees and assisting them to successfully integrate has not been without challenges. Traumatic pre-migration experiences as a result of being subjected to and/or witnessing violence, separation from and loss of family members, and loss of property and social status coupled with experiences of hardships in transit countries have a profound impact on families and their integration. Refugees are subjected to individual and collective traumatic experiences associated with cultural or ethnic disconnection, mental health struggles, and discrimination and racism. These experiences have been shown to impact family interactions. Arab refugee families have different definitions of “family” and “home” from Eurocentric conceptualizations which are grounded in individualistic worldviews. The discrepancy between collectivism and individualism is mainly recognized by collectivist newcomers as challenges in the areas of gender norms, expectations regarding parenting and the physical discipline of children, and diverse aspects of the family’s daily life. For this study, we interviewed 30 adults, all Arab refugees (14 Syrian and 16 Iraqi – 17 males, 13 females) residing in London, Ontario, Canada for a period of time ranging from six months to seven years. The study participants were married couples with and without children. During the semi-structured interviews, the participants were asked to reflect on their family life during pre-migration – in the country of origin before and during the war and in the transit country – and post-migration in Canada. The inter - views were conducted in Arabic, audio-recorded, and transcribed. We also conducted one focus group with seven service providers from diverse sectors in London, Ontario who work with Arab refugee families. The study used the underlying principles of constructivist grounded theory methodology to guide interviewing and a thematic analysis was performed. MAXQDA software was used to facilitate coding and the identification of key themes within the transcribed interviews. We also conducted a thematic analysis of the focus group transcription. The thematic analysis of the individual interviews identified four key themes: • Gender role changes influence spousal relationships; • Traumatic experiences bring suffering and resilience to family well-being; • Levels of marital conflict are higher following post-migration settlement; • Post-migration experiences challenge family values. The outcome of the thematic analysis of the service provider focus group identified three key themes: • The complex needs of newly arrived Arab refugee families; • Gaps in the services available to Arab refugee families; • Key aspects of training for cultural competencies. The key themes from the individual interviews demonstrate: (i) the dramatic sociocul - tural changes associated with migration that particularly emphasize different gender norms; (ii) the impact of trauma and the refugee experience itself on family relation - ships and personal well-being; (iii) the unique and complex aspects of the family journey; and (iv) how valued aspects of cultural and religious values and traditions are linked in complex ways for these Arab refugee families. These outcomes are consist - ent with previous studies. The study finds that women were strongly involved in supporting their spouses in every aspect of family life and tried to maintain their spouses’ tolerance towards stressors. The struggles of husbands to fulfill their roles as the providers and protec - tors throughout the migratory journey were evident. Some parents experienced role shifts that they understood to be due to the unstable conditions in which they were living but these changes were considered to be temporary. Despite the diversity of refugee family experiences, they shared some commonalities in how they experi - enced changes that were frightening for families, as well as some that enhanced safety and stability. These latter changes related to safety were welcomed by these fami - lies. Some of these families reported that they sought professional help, while others dealt with changes by becoming more distant in their marital relationship. The risk of violence increased as the result of trauma, integration stressors, and escalation in marital issues. These outcomes illustrate the importance of taking into consideration the complexity of the integration process in light of post-trauma and post-migration changes and the timespan each family needs to adjust and integrate. Moreover, these families expressed hope for a better future for their children and stated that they were willing to accept change for the sake of their children as well. At the same time, these parents voiced the significance of preserving their cultural and religious values and beliefs. The service providers identified gaps in service provision to refugee families in some key areas. These included the unpreparedness of professionals and insufficiency of the resources available for newcomer families from all levels of government. This was particularly relevant in the context of meeting the needs of the large influx of Syrian refugees who were resettled in Canada within the period of November 2015 to January 2017. Furthermore, language skills and addressing trauma needs were found to require more than one year to address. The service providers identified that a longer time span of government assistance for these families was necessary. In terms of training, the service providers pinpointed the value of learning more about culturally appropriate interventions and receiving professional development to enhance their work with refugee families. In light of these findings, we recommend an increased use of culturally integrative interventions and programs to provide both formal and informal support for families within their communities. Furthermore, future research that examines the impact of culturally-based training, cultural brokers, and various culturally integrative practices will contribute to understanding best practices. These findings with regard to refugee family relationships and experiences are exploratory in their nature and support future research that extends understanding in the area of spousal relationships, inter - generational stressors during adolescence, and parenting/gender role changes.