Résumé Les systèmes microbiologiques naturels (colonne d’eau), semi-naturels (station d’épuration), mais surtout industriels ou de laboratoire (bioréacteurs) sont communément représentés par des modèles mathématiques destinés à l’étude, à la compréhension des phénomènes ou au contrôle des processus (de production, par exemple). Dans l’énorme majorité des cas, lorsque les cellules (procaryotes ou eucaryotes) mises en jeu dans ces systèmes sont en suspension, le formalisme de ces modèles non structurés traite le système comme s’il était homogène. Or, en toute rigueur, il est clair que cette approche n’est qu’une approximation et que nous avons à faire à des phénomènes hétérogènes, formés de plusieurs phases (solide, liquide, gazeuse) intimement mélangées. Nous désignons ces systèmes comme « polyphasiques dispersés » (SPD). Ce sont des systèmes thermodynami-quement instables, (presque) toujours ouverts. La démarche que nous avons entreprise consiste à examiner si le fait de considérer des systèmes dits « homogènes » comme des systèmes hétérogènes (ce qu’ils sont en réalité) apporte, malgré une complication du traitement mathématique, un complément d’information significatif et pertinent. La démarche s’est faite en deux temps : · Une étape purement théorique, destinée à établir de manière rigoureuse et générale les bilans de matière pour chaque composé du système dans chacune de ces phases. · Une étape appliquée, visant à démontrer, au travers d’exemples concrets, la validité du concept et de la démarche. Pour l’étude des applications, pour diverses raisons, nous avons choisi d’étudier un bioréacteur ouvert « simple », le chémostat. Les bilans généraux dérivés à la première étape ont donc été appliqués à ce réacteur et plusieurs exemples, tirés de la littérature, pour la plupart, ont été traités dans le cadre des SPD. Les principaux résultats exposés dans le travail concernent : - sur le plan général, la pertinence d’une partition des systèmes en plusieurs phases, ce qui fait apparaître à la fois des flux d’échange interphasiques (qui n’apparaissent pas dans les systèmes dits monophasiques) et la possibilité de représenter le système à plusieurs niveaux de description. - quant aux applications, outre quelques petits exemples simples, nous proposons 1) un nouveau mécanisme pour représenter la dissipation de l’énergie cellulaire (un domaine encore très controversé), grâce à une approche implicite (c’est-à-dire, sans hypothèses particulières sur la forme des cinétiques intracellulaires) et 2) un modèle simple, original et innovant pour expliquer les signaux chimiques intercellulaires, les phénomènes de seuil et le branchement métabolique respiro-fermentatif en général et chez Saccharomyces cerevisiae en particulier, un mécanisme d’intérêt fondamental et industriel (levuristes et fermentations alcooliques). Abstract. Natural microbiological systems (rivers, seas, …), semi-natural (wastewater treatment plants), but especially industrial or lab-scale systems (bioreactors) are commonly represented by mathematical models intended for the study, the understanding of phenomena or for the control of processes (production, for example). In almost in every case, when the cells (prokaryotic or eukaryotic) concerned in these systems are in suspension, the formalism of these unstructured models treats the system as if it were homogeneous. However, in any rigor, this approach is clearly only an approximation and we have to deal with heterogeneous phenomena, formed of several phases (solid, liquid, gas) closely mixed. We refer to these systems as “polyphasic dispersed systems” (PDS). They are thermodynamically unstable systems, and are (practically) always open. The approach we undertook consists in examining if treating apparent «homogeneous» systems as heterogeneous systems (what they actually are) brings, in spite of some mathematical complications, further significant and relevant information’s. We proceeded in two steps: · A purely theoretical stage, intended to establish in a rigorous and general way the mass balances for each compound in each phases of the system. · A applied stage, aiming at showing, through concrete examples, the soundness of the concept and of the method. Concerning the applications, for several reasons, we chose to study a “simple” open bioreactor: the chemostat. The general balances previously derived in a general way were hence applied to this reactor and a number of examples, mainly obtained from the literature, were treated within the PDS framework. The principal results presented in this work concern: - on the general level, the importance of partitioning the system in different phases, enlightening at the same time interphasic exchange flows (which do not appear in the systems known as monophasic) and the possibility of representing the system on several levels of description. - concerning the applications, in addition to some small simple examples, we propose 1) a new mechanism representing the cellular energy dissipation (a still very controversial field), using an implicit approach (i.e., without particular assumptions about the form of the intracellular kinetics) and 2) a simple, original and inventive model explaining cellular chemical signaling, threshold phenomena and a general metabolic switch occurring during respirofermentative transition. The latter was especially tested on Saccharomyces cerevisiae data to interpret the Crabtree effect in yeast, a mechanism of fundamental and industrial importance (in connection with baker’s yeast production and alcoholic fermentations).

<p><p>The present essay examines the linguisitc conceptualisation of otherness in the present party platforms of the Sozialdemokratische Partei Deutschlands (SPD, Social Democratic Party of Germany) and the Christliche Demokratische Union Deutschlands (CDU, Christian Democratic Union of Germany). The language and the textual structure of their party platforms is analysed, its function described and compared with each other by using representative text excerpts. The theoretical background of this study is grounded in cultural studies. The methodological framework consists of a combination of critical discourse analysis and textual analysis. Criterias of the linguistic analysis are: coherence (including implicit meanings, propositions and presuppositions), modality, thematic roles, deixis and pronouns and keywords. </p><p> </p><p>The study shows that the<em> Other </em>is cleary conceptualized by using binary oppositions whereas those who are reperesented by <em>we</em> can not always be clearly identified. By using both objective and subjective modality authority and legitimacy are linguistically constructed by those who represent <em>we</em>. The analysis shows that stipulations and issues are mentioned which are supposed to be abided by the <em>Others</em> without being justified by those who represent <em>we</em>. Consequently the <em>Other</em> is excluded. Analysing both party platforms shows that the <em>Other</em> is  subcategorized, too. Myths about the <em>Others</em> are confirmed by representing a stereotypical image of the <em>Other</em> through language. However there are differences in the linguistic conceptualization of alterity. The representatives of CDU speak out more explicitly on specific issues concerning the<em> Other</em> than representatives of SPD do. Consequently SPD’s statements concerning the <em>Other</em> are more implicit.</p><p> </p><p>The study shows that meaning is created by language and that myths of the <em>Other</em> are reproduced in political discourse.</p><p> </p></p>

This master thesis focuses on the development of the Social Democratic Party of Germany (SPD) between the years 1990 and 2005. At the beginning of this period, Germany was reunited. At the end, the coalition government of the SPD and the Greens came to its end and the SPD lost the office of the Chancellor. The first chapter of this thesis summarizes the post- war development of the SPD, which is crucial for better understanding of the events after the year 1990. The following chapters are, in accordance with the election period focused on the period of 1990 - 2005. The main focus of this thesis are the important phenomena which were linked to the SPD during the analysed period. Attention is paid to the debates within the party regarding economic, social and foreign policy or personnel issues. The main program documents of the SPD from the years 1990 - 2005 are analysed. All the mentioned information is summarised and interpreted.

As ligas à base de níquel de alta resistência são utilizadas em uma infinidade de sistemas avançados, onde baixo peso e sistemas de transmissão mecânica de alta densidade de energia são necessários. Componentes, tais como, engrenagens, rolamentos e eixos poderiam ser consideravelmente menor e mais durável se uma grande melhoria em propriedades mecânicas de ligas à base de níquel for alcançada. Um refinamento significativo no tamanho de grão (incluindo nível nano) é um método promissor para a obtenção de melhorias fundamentais nas propriedades mecânicas. O tamanho de grão é conhecido por ter um efeito significativo sobre o comportamento mecânico dos materiais. Um dos métodos mais favoráveis de alcançar refinamento de grão extremo é submetendo os materiais à deformação plástica intensa. As principais variáveis microestruturais nas superligas são a quantidade de precipitados e sua morfologia, o tamanho e a forma do grão e a distribuição de carbonetos (Cr7C3 e Cr23C6) que poderão reduzir propriedades mecânicas da liga. Neste trabalho é apresentada análise por microscopia óptica e eletrônica de transmissão e também os dados de dureza após deformação plástica intensa (tensão de cisalhamento puro) e alguns tratamentos térmicos. / High strength nickel based alloys are used in a multitude of advanced systems where lightweight, high power density mechanical power transmission systems are required. Components such as gears, bearings and shafts could be made significantly smaller and more durable if a major improvement in nickel based alloy mechanical properties could be achieved. A significant refinement in grain size (includes nano level) is thought to be a promising method for achieving fundamental improvements in mechanical properties. Grain size is known to have a significant effect on the mechanical behavior of materials. One of the most favorable methods of achieving extreme grain refinement is by subjecting the materials to severe plastic deformation. The principal microstructural variations in superalloys are the precipitation amount and morphology, grain size and the distribution of carbide precipitation (Cr7C3 and Cr23C6) that could reduce the mechanical properties of the alloys. This work shows optical and transmission electron microscopy analysis and also hardness data after severe plastic deformation (pure shear stress) and some thermal treatments.

As ligas à base de níquel de alta resistência são utilizadas em uma infinidade de sistemas avançados, onde baixo peso e sistemas de transmissão mecânica de alta densidade de energia são necessários. Componentes, tais como, engrenagens, rolamentos e eixos poderiam ser consideravelmente menor e mais durável se uma grande melhoria em propriedades mecânicas de ligas à base de níquel for alcançada. Um refinamento significativo no tamanho de grão (incluindo nível nano) é um método promissor para a obtenção de melhorias fundamentais nas propriedades mecânicas. O tamanho de grão é conhecido por ter um efeito significativo sobre o comportamento mecânico dos materiais. Um dos métodos mais favoráveis de alcançar refinamento de grão extremo é submetendo os materiais à deformação plástica intensa. As principais variáveis microestruturais nas superligas são a quantidade de precipitados e sua morfologia, o tamanho e a forma do grão e a distribuição de carbonetos (Cr7C3 e Cr23C6) que poderão reduzir propriedades mecânicas da liga. Neste trabalho é apresentada análise por microscopia óptica e eletrônica de transmissão e também os dados de dureza após deformação plástica intensa (tensão de cisalhamento puro) e alguns tratamentos térmicos. / High strength nickel based alloys are used in a multitude of advanced systems where lightweight, high power density mechanical power transmission systems are required. Components such as gears, bearings and shafts could be made significantly smaller and more durable if a major improvement in nickel based alloy mechanical properties could be achieved. A significant refinement in grain size (includes nano level) is thought to be a promising method for achieving fundamental improvements in mechanical properties. Grain size is known to have a significant effect on the mechanical behavior of materials. One of the most favorable methods of achieving extreme grain refinement is by subjecting the materials to severe plastic deformation. The principal microstructural variations in superalloys are the precipitation amount and morphology, grain size and the distribution of carbide precipitation (Cr7C3 and Cr23C6) that could reduce the mechanical properties of the alloys. This work shows optical and transmission electron microscopy analysis and also hardness data after severe plastic deformation (pure shear stress) and some thermal treatments.

The present essay examines the linguisitc conceptualisation of otherness in the present party platforms of the Sozialdemokratische Partei Deutschlands (SPD, Social Democratic Party of Germany) and the Christliche Demokratische Union Deutschlands (CDU, Christian Democratic Union of Germany). The language and the textual structure of their party platforms is analysed, its function described and compared with each other by using representative text excerpts. The theoretical background of this study is grounded in cultural studies. The methodological framework consists of a combination of critical discourse analysis and textual analysis. Criterias of the linguistic analysis are: coherence (including implicit meanings, propositions and presuppositions), modality, thematic roles, deixis and pronouns and keywords.    The study shows that the Other is cleary conceptualized by using binary oppositions whereas those who are reperesented by we can not always be clearly identified. By using both objective and subjective modality authority and legitimacy are linguistically constructed by those who represent we. The analysis shows that stipulations and issues are mentioned which are supposed to be abided by the Others without being justified by those who represent we. Consequently the Other is excluded. Analysing both party platforms shows that the Other is  subcategorized, too. Myths about the Others are confirmed by representing a stereotypical image of the Other through language. However there are differences in the linguistic conceptualization of alterity. The representatives of CDU speak out more explicitly on specific issues concerning the Other than representatives of SPD do. Consequently SPD’s statements concerning the Other are more implicit.   The study shows that meaning is created by language and that myths of the Other are reproduced in political discourse.

Darnaus vystymosi švietimo prielaidos BPD 2.4 priemonės projektuose. Raktiniai žodžiai: darnus vystymasis, darnaus vystymosi švietimas, BPD 2.4 priemonė, mokymasis visą gyvenimą. Darnaus vystymosi siekis – užtikrinti tinkamą asmens gyvenimo kokybę, siekti visuomenės gerovės ir saugumo, išmintingai derinant ekonomikos, socialinės raidos bei aplinkos apsaugos uždavinius. Išsilavinimas yra vienas svarbiausių faktorių, nuo kurio priklauso žmogaus ir visuomenės pasirengimas ir motyvacija spręsti daugialypes darnaus vystymosi problemas. Švietimui, visuomenės informavimui, įvairių sričių specialistų kvalifikacijos tobulinimui čia tenka ypatingas vaidmuo. Kadangi visuomenės darnaus vystymosi koncepcija yra dinamiška, jos įgyvendinimo modeliai yra nuolat plėtojami priklausomai nuo įgytų žinių ir patirties: darnus vystymasis yra nuolatinio mokymosi vyksmas. Todėl visos veiklos, prisidedančios prie mokymosi visą gyvenimą kokybės gerinimo, sykiu kuria prielaidas darnaus vystymosi nuostatoms įgyvendinti. Magistro baigiamasis darbas susideda iš keturių dalių dalių: Pirmoje dalyje apibrėžiamas švietimo vaidmuo įvairaus lygmens darnaus vystymosi strateginiuose dokumentuose. Antroje - nagrinėjamos mokymosi visą gyvenimą strateginės nuostatos, atskleidžiamos jų sąsajas su Lietuvos švietimo prioritetais. Trečioje - nurodomi tyrimo metodai ir suformuluojami tyrimo kriterijai. Ketvirtoje – pateikiami BPD 2.4 priemonės „Mokymosi visą gyvenimą sąlygų plėtojimas“ projektų paraiškų analizės... [toliau žr. visą tekstą] / Prerequisites for sustainable development of education in the projects of SPD 2.4 facility. Key words: Sustainable Development, Education for Sustainable, SPD 2.4 Facility, Lifelong Learning. The goal of sustainable development is ensuring the proper quality of individual life, seeking for public safety and welfare by wisely coordinating economic, societal development and environmental tasks. Education is one of the key factors determining the preparation and motivation of individual and society on solving the multifaceted problems of sustainable development. Education, public notification, and qualification improvement of specialists in various fields here plays a special role. As the concept of sustainable development of society is dynamic, its models of implementation are being continuously advanced depending upon the level of gained knowledge and experience: sustainable development is a process of continuous learning. Therefore every activity contributing to the quality improvement of lifelong learning likewise generates prerequisites for implementation of sustainable development provisions. The Master Final Thesis consists of four parts: The first part contains a description of education in strategic documents of sustainable development of different levels. The second part contains the analysis of strategic provisions of lifelong learning and their links with Lithuanian educational priorities. Methods of research and research criteria are specified in the third part... [to full text]

The dependence of flow stress of body centered cubic metals on variables such as strain rate, temperature, strain and microstructural is a research area of continued interest. Recently, there has been renewed interest in deformation of fine grained BCC metals, which display characteristics that are different from their coarse-grained counterparts. Deformation mechanisms, strain-rate and temperature dependence, and strain hardening characteristics of fine-grained BCC metals are not well understood. The aim of this thesis is to understand the effect of strain-rate, temperature, strain and microstructure (i.e., grain size) on the mechanical response of poly¬crystalline tantalum. Among the topics addressed were constitutive modeling of flow stress, understanding the microstructural origins of strain hardening, and characterizing the effect of severe plastic deformation (SPD) on microstructure and mechanical properties. Rolling and equal-channel angular pressing (ECAP) were among the processing techniques employed. Mechanical testing was conducted over a range of temperatures and strain rates, and this was supported by a slew of microscopic characterization methods. It was found that the strain hardening response depends on microstructural evolution at different strain rates. Results indicate that the same thermally activated mechanisms operate in both as-received and processed material and this was found to be the overcoming of Peierls barriers via a double-kink mechanism. Lastly, it was found that the low strain rate sensitivity of SPD processed material was not due to fine grain size, but instead due to high internals stresses.

This thesis is focused on processing of pure magnesium by high pressure torsion method (HPT). This process belongs to the group of intensive plastic deformation methods (SPD). SPD methods are in the centre of scientific interest for several decades. Theoretical part of this thesis puts an effort to summarize basic knowledge and principles of SPD methods with extra focus on method HPT. As theoretical part continues magnesium as technical material is presented. Influence of SPD on use and properties of pure magnesium is then presented. This trend is further developed in effort to describe the effect of individual HPT process variables on the properties of pure magnesium and its alloys. Focus of practical part of this thesis is in influence of number of revolutions. Samples were processed at 1/8, 1/4, 1/2, 1, 4 and 8 turns at room temperature. Speed of process was 1rpm and applied pressure was 6 GPa. The structure of commercially pure magnesium prepared by casting and moulding were observed with focus on differences caused by input material. The structure was observed by both light microscopy and back scattered electron diffraction (EBSD), focusing on structure development, grain size and grain orientation. Compared to other works on similar topic, the emphasis here is on observing the microhardness on the vertical edge of the sample. The hardness shows a steep increase right after 1/8 of a turn. With increasing number of turns gradual homogenization of microhardness is presented accompanied by slight decrease in microhardness. No trend in microhardness relative to the distance from anvil has occurred. Structure observed with EBSD shows a bimodal character with larger grains oriented in the same direction. The three-point bending test didn’t end up as expected, and the approach to evaluation of magnesium-based HPT needs to be re-evaluated for future work. A three-point bending test was designed for the initial assessment of the basic mechanical properties of the material.

Title: Phase transformations in ultra-fine grained titanium alloys Author: Kristína Bartha Department: Department of Physics of Materials Supervisor of the doctoral thesis: PhDr. RNDr. Josef Stráský, Ph.D., Department of Physics of Materials Abstract: Ti15Mo alloy in a metastable β solution treated condition was processed by high pressure torsion (HPT) and equal channel angular pressing (ECAP). The microstructure after HPT is severely deformed and ultra-fine grained, while ECAP deformation results in rather coarse-grained structure with shear bands containing high density of lattice defects. Two types of thermal treatments - isothermal annealing and linear heating - were carried out for the solution treated condition and both deformed materials. Wide spectrum of experimental techniques was employed to elucidate the differences in phase transformations, especially in α phase precipitation, occurring in deformed and non-deformed material upon thermal treatment. It was shown that the α phase precipitation is accelerated in the deformed materials due to a high density of lattice defects, which provide a dense net of preferred sites for nucleation and also fast diffusion paths necessary for accelerated growth. The enhanced precipitation of the α phase in deformed materials also affects the stability of the ω...