Cette thèse porte sur l'étude de nanofils silicium réalisés par approche top-down. Elle s'inscrit dans le contexte de la miniaturisation des composants et la compréhension du transport dans les systèmes 1D. Deux voies de fabrication sont envisagées: la lithographie par AFM (Microscope à Force Atomique) et la lithographie électronique. Cette dernière étant plus reproductible, les dispositifs finaux sont fabriqués par cette technique, à partir d'un substrat SOI et plusieurs étapes de gravure et métallisation. L'étude des nanofils par mesures l(V) nous permet de mettre en évidence une zone déplétée à l'interface Si/SiO2 natif. Grâce à l'utilisation de nanofils de largeurs et de longueurs différentes, nous sommes capables de déterminer la largeur de la zone déplétée, la densité d'états d'interface ainsi que le niveau de dopage des nanofils. L'évolution de la résistance des nanofils avec la température est également étudiée et montre une dépendance associée à la diffusion des phonons de surface. Trois applications sont ensuite décrites : un décodeur, un commutateur de courant et un capteur biologique. En effet, la gravure locale des nanofils conduit à une modulation de la bande de conduction, rendant possible la réalisation d'un décodeur. D'autre part, la fabrication de croix à base de nanofils et de grilles latérales à proximité des croix qui contrôlent le passage du courant dans les différentes branches permet de former un commutateur de courant. Enfin, grâce au rapport important de la surface par rapport au volume des nanofils et leur bonne fonctionnalisation chimiques, ceux-ci sont utilisés pour détecter électriquement des interactions biologiques (détection de l'ovalbumine). / This work focuses on the study of silicon nanowires made by a top-down approach. The context of the study is the miniaturisation of the components and the understanding of the transport in 1D systems. Two fabrication approaches are studied : AFM lithography (Atomic Force Microscope) and e-beam lithography. The latter being more reproducible, the final devices are fabricated by this technique using a SOI substrate and multiple steps of etching and metallization.Transport characterization of the Si nanowires allows us to highlight a depleted area at the interface Si/native SiO2. Using nanowires with different widths and lengths, we can determine the depletion width, the surface state density as well as the doping level of the nanowires. The evolution of the nanowires resistance with temperature is also investigated, showing a dependence associated with surface phonons scattering. In the last chapter, three applications are described : a decoder, a current switch and a biosensor. The use of a local etching allows the modulation of the conduction band of the nanowires, opening the way to build a decoder using two local gates. Crossbar structures, where lateral gates which can derive the current in the di_erent branches, lead to the fabrication of a current switch. Finally, thanks to the large surface to volume ratio in these structures, the nanowires are used to detect electrically the interactions between molecules (ovalbumine detection).

Universiẗat, Diss., 1999--Kaiserslautern.

Gonyostomum semen is a raphidophyte microalgae that can be found in brown water lakes all over Sweden. The species forms substantial summer blooms that can completely dominate the phytoplankton community, largely due to its limited grazing pressure. To test whether parasites control the abundance of G. semen, as well as to study a newly discovered predator – prey interaction, three experiments were set up. The first experiment aimed to look at potential parasite interactions by screening for infections in natural environments, but none could be found. The second experiment built on the first by testing if the lack of parasites was due to physiological characteristics of G. semen, by exposing the species to diatom parasites and observing the cell’s response. The third experiment investigated the impact of a predatory ciliate on G. semen cell abundance. This predator – prey interaction was first observed in fresh lake water samples and had so far not been described in the literature. First, G. semen alone was exposed to the ciliate, and later the prey preference of the ciliate was examined by offering it four different potential prey species. The results from the first and second experiment suggested that G. semen does not have any parasites, potentially due to lack of a supportive cell wall. When interacting with parasite zoospores, the G. semen cells burst open, meaning that a successful infection would not be possible. The third experiment showed that the ciliate does feed on G. semen, and that it likely prefers G. semen over other types of prey. The limited top – down control on G. semen gives the species an ecological advantage and is seemingly one of the main reasons for G. semen’s success in spreading to new habitats.

No description available.

Trata do desenvolvimento de uma metodologia para parametrização de equipamentos mecânicos pressurizados. Objetiva criar sistemas para geração de famílias de equipamentos petroquímicos e reduzir o tempo total de elaboração do projeto, desenhos e listas de materiais em até 80%, diminuir em até 70% o tempo consumido na geração de fichas de corte e mapas de solda na execução de roteiros de fabricação e ainda aprimorar a aquisição de materiais e componentes devido à padronização das entradas de projeto. Relata que os sistemas CAD (Computer-Aided Design) tridimensionais paramétricos têm papel cada vez mais destacado no desenvolvimento de equipamentos, porém alguns setores tradicionais da indústria brasileira apresentam ainda certa resistência ao emprego desta tecnologia. Demonstra que diante dos desafios impostos pela exploração de petróleo na camada do Pré-Sal e o grande volume de investimentos da PETROBRAS na expansão do setor produtivo ligado à extração e refino de petróleo, as empresas fornecedoras de equipamentos para o setor petroquímico são obrigadas a se modernizar e buscar novos paradigmas de projeto e fabricação para atender à demanda. Explica que o emprego produtivo de sistemas CAD 3D paramétricos se torna essencial neste cenário. Aplica a metodologia que foi desenvolvida baseada na abordagem top-down para modelagem de montagens, e afirma esta metodologia pode ser adaptada a qualquer sistema CAD 3D paramétrico comercial, com baixo consumo de recursos computacionais. Apresenta para validação um exemplo de aplicação passo a passo da metodologia para um equipamento. Mostra que a metodologia foi aplicada também para a construção de uma família de vasos de pressão verticais suportados por saia, com o intuito de avaliar o desempenho, com a obtenção de resultados significativos. Discute os problemas e dificuldades enfrentados na implantação do sistema paramétrico, juntamente com as alterações que este sistema trás na estrutura organizacional tradicional de empresas de bens de capital. Conclui que a metodologia desenvolvida apresentou resultados dentro dos objetivos estabelecidos e é uma alternativa viável para projetos mecânicos, que possibilita ganho de produtividade significativo. / This work addresses a methodology for the parameterization of pressurized mechanical equipments. It focuses on creating systems to generate an assembly of petrochemical equipments, hence reducing the total time of project designs, layouts and bill of material until 80%, decreasing until 70% the time consumed for executing manufacturing instructions and also improving materials and components acquisition due to the standardization of project entries. The study reports that three-dimensional parametric CAD systems (Computer-Aided Design) have an increasingly prominent role in the development of equipments, however some traditional sectors in the Brazilian industry are still somewhat resistant to using this technology. This work shows that with the challenges posed by oil exploration in the pre-salt layer and PETROBRAS large investments in the productive expansion sector for oil extraction and refining, the equipment supply companies servicing the petrochemical industry are forced to modernize and seek new design and manufacturing paradigms to meet the demands. It explains that the productive use of 3D parametric CAD systems are essential in this scenario. The methodology that was developed based on the top-down approach for assembly modeling is applied, thereby showing that this methodology can be adapted to any commercial 3D parametric CAD system, with low computational consumption of resources. For validation, it shows a step by step application example of the methodology in one equipment. It shows that the methodology was also applied to the construction of a family of skirt supported vertical pressure vessels, in order to evaluate the performance, with significant results. This work discusses the problems and difficulties faced in implementing the parametric system, along with the changes this system brings in the traditional organizational structure of capital goods companies. It concludes that this methodology presented results within the stated objectives and that it is a viable alternative for mechanical designs, hence enabling significant productivity gains.

Trata do desenvolvimento de uma metodologia para parametrização de equipamentos mecânicos pressurizados. Objetiva criar sistemas para geração de famílias de equipamentos petroquímicos e reduzir o tempo total de elaboração do projeto, desenhos e listas de materiais em até 80%, diminuir em até 70% o tempo consumido na geração de fichas de corte e mapas de solda na execução de roteiros de fabricação e ainda aprimorar a aquisição de materiais e componentes devido à padronização das entradas de projeto. Relata que os sistemas CAD (Computer-Aided Design) tridimensionais paramétricos têm papel cada vez mais destacado no desenvolvimento de equipamentos, porém alguns setores tradicionais da indústria brasileira apresentam ainda certa resistência ao emprego desta tecnologia. Demonstra que diante dos desafios impostos pela exploração de petróleo na camada do Pré-Sal e o grande volume de investimentos da PETROBRAS na expansão do setor produtivo ligado à extração e refino de petróleo, as empresas fornecedoras de equipamentos para o setor petroquímico são obrigadas a se modernizar e buscar novos paradigmas de projeto e fabricação para atender à demanda. Explica que o emprego produtivo de sistemas CAD 3D paramétricos se torna essencial neste cenário. Aplica a metodologia que foi desenvolvida baseada na abordagem top-down para modelagem de montagens, e afirma esta metodologia pode ser adaptada a qualquer sistema CAD 3D paramétrico comercial, com baixo consumo de recursos computacionais. Apresenta para validação um exemplo de aplicação passo a passo da metodologia para um equipamento. Mostra que a metodologia foi aplicada também para a construção de uma família de vasos de pressão verticais suportados por saia, com o intuito de avaliar o desempenho, com a obtenção de resultados significativos. Discute os problemas e dificuldades enfrentados na implantação do sistema paramétrico, juntamente com as alterações que este sistema trás na estrutura organizacional tradicional de empresas de bens de capital. Conclui que a metodologia desenvolvida apresentou resultados dentro dos objetivos estabelecidos e é uma alternativa viável para projetos mecânicos, que possibilita ganho de produtividade significativo. / This work addresses a methodology for the parameterization of pressurized mechanical equipments. It focuses on creating systems to generate an assembly of petrochemical equipments, hence reducing the total time of project designs, layouts and bill of material until 80%, decreasing until 70% the time consumed for executing manufacturing instructions and also improving materials and components acquisition due to the standardization of project entries. The study reports that three-dimensional parametric CAD systems (Computer-Aided Design) have an increasingly prominent role in the development of equipments, however some traditional sectors in the Brazilian industry are still somewhat resistant to using this technology. This work shows that with the challenges posed by oil exploration in the pre-salt layer and PETROBRAS large investments in the productive expansion sector for oil extraction and refining, the equipment supply companies servicing the petrochemical industry are forced to modernize and seek new design and manufacturing paradigms to meet the demands. It explains that the productive use of 3D parametric CAD systems are essential in this scenario. The methodology that was developed based on the top-down approach for assembly modeling is applied, thereby showing that this methodology can be adapted to any commercial 3D parametric CAD system, with low computational consumption of resources. For validation, it shows a step by step application example of the methodology in one equipment. It shows that the methodology was also applied to the construction of a family of skirt supported vertical pressure vessels, in order to evaluate the performance, with significant results. This work discusses the problems and difficulties faced in implementing the parametric system, along with the changes this system brings in the traditional organizational structure of capital goods companies. It concludes that this methodology presented results within the stated objectives and that it is a viable alternative for mechanical designs, hence enabling significant productivity gains.

Det finns två typer av goodwill, den första typen är internt upparbetad goodwill och den andra typen är goodwill som uppkommer vid förvärv av företag. Fokus i denna uppsats kommer att ligga på den förvärvade goodwill, som kan upplevas som en svart låda då det kan vara oklart vad posten faktiskt består av. Förvärvad goodwill kan definieras på olika sätt av företagen, i den akademiska världen har främst två perspektiv identifierats, top-downperspektivet och bottom-upperspektivet. Ur den första synvinkeln ses goodwill som en restpost och ur den andra synvinkeln kan goodwill ses som en summa av de komponenter som posten består av. Genom att betrakta dessa perspektiv är tanken att få en inblick i hur företagen väljer att redovisa sin goodwill. Det kan vara lättare sagt än gjort, teori och praktik går inte alltid hand i hand. Det finns ett glapp mellan hur praktiker jobbar med goodwill och teoretikers åsikt om posten. Varför det finns meningsskiljaktigheter växer successivt fram under studiens gång. Det finns än så länge bara ett fåtal studier som behandlar själva begreppet goodwill och dess olika perspektiv samt hur företagen ser på goodwill. För att försöka bidra till ökad förståelse på detta område, har vi i denna uppsats undersökt om teorin och praktiken kommit varandra närmare. Det främsta syftet med studien är att ta reda på om företag inom bemanningsbranschen definierar sin goodwill olika i sina årsredovisningar. För att undersöka detta på ett begripligt sätt har tre professionella respondenter intervjuats i ett försök att klargöra komplexiteten av posten.   Slutsatsen är att det inte går att identifiera vilket perspektiv som används i en årsredovisning på grund av att dessa är väldigt standardiserade, vilket gör att det blir svårt för intressenten att utläsa särskilt mycket information om goodwillposten.  Det alternativ som kändes mest relevant att använda och som skulle hjälpa oss att kunna få klarhet i vår frågeställning, var att vända sig till en urvalsgrupp av representanter på området. Den analys som efterföljde resulterade i att vi kunde konstatera att samtliga svarande på det praktiska området såg goodwillposten mer eller mindre som en restpost. Ingen värdering eller starkare reflektion gjordes kring det andra teoretiska perspektivet. Sammanfattningsvis vågar vi påstå att det inte skett någon märkbar förändring som gjort att teori och praktik närmat sig varandra. / There is two ways to understand goodwill. Number one, internally generated goodwill and number two, acquired purchase goodwill. The main topic for this research is acquired purchase goodwill. Many people believe that goodwill is a sort of black box.  It is unclear what goodwill actually is. There is no limit on how you can define acquired purchase goodwill. In academia we talk about two perspectives, top-down perspective and bottom-up perspective. The first perspective sees goodwill as a residual and the second perspective sees goodwill as a sum of its components. When you put on these two glasses, the idea is that you may be able to see how businesses account for their goodwill. It is easier said than done, many times theory and practice does not get along. There is a big space between the theories on how you work with goodwill in the reality. Only a few have studied the definition of goodwill. Because of that we really wanted to investigate this phenomenon. We have analyzed if the gap between theory and reality has been reduced. The purpose of this study is to investigate if the staffing companies define goodwill different in their annual reports. The tool we have used is to interview professional accountants to get their opinion. The conclusion is that the annual report is quite standardized which means it is difficult to understand what goodwill actually is. Everybody we interviewed have the same opinion, that goodwill is a residual. They made no reflections or additions on that subject. In summary, we know now that after our study, no big change has been made between theory and practice.

In this thesis I will discuss and criticize different legitimation for lawmaking, including ancient and contemporary Chinese theories, and Western representative perspectives on lawmaking. I will disclose disadvantages of Chinese lawmaking system. As a new research project of Chinese law, I argue that both the traditional and contemporary Chinese lawmaking lacked elements of communication. The top-down lawmaking mode was the reality as well as the dominant theoretical justifications of legislation in China. I believe that the top-down lawmaking mode in China was insufficient in its justifications for legitimacy; neither was it beneficial for increasing the degree of individual freedom and rights. Therefore it is better to absorb positive Western lawmaking elements, especial taking a shift from a non-communicative mode to a more interactive and cooperative mode. Western theories of lawmaking could contribute to Chinese future legal reform. Theories of disagreement and individual freedom have positive contributions to this proposed change. After my introduction and analysis of Western theories, I attempted to escape from pure theoretic discussion about law and legality, and try to provide a practical application of communicative lawmaking in China. Relying on the contributions of Western lawmaking theories, but at the same time realizing their difficulties in their application in Chinese contexts, I believe that Confucianism, a Chinese philosophy of love and law could contribute to a discourse theory of lawmaking. The core of Confucianism, Ren (‘仁’ , loving the people, humanism) provided a possible theoretical background for a discourse theory. Professor Bankowski’s argument for the interplay of law and love, the inside and the outside systems, also initiated a debate for the communicative decision-making, and is thus employed to solve the difficulty of applying Western theories into Chinese contexts. The ‘appropriate’ lawmaking in this thesis refers to a communicative lawmaking mode, in contrast to the non-communicative mode that defended by Chinese legalism and contemporary justifications of lawmaking. I attempt to introduce this interactive and cooperative lawmaking structure to balance individual rights and state interests. This structure would go against the grain of the traditional top-down legislation. In this new structure individuals’ voice could be heard and paid attention to, which is a system of achieving Ren ( humanism).

Three experiments examine how collaboration influences visual search performance. Working with a partner or on their own, participants reported whether a target was present or absent in briefly presented search displays. The search performance of individuals working together (collaborative pairs) was compared to the pooled responses of the individuals working alone (nominal pairs). Collaborative pairs were less likely than nominal pairs to correctly detect a target and they were less likely to make false alarms. Signal detection analyses revealed that collaborative pairs were more sensitive to the presence of the target and had a more conservative response bias than the nominal pairs. This pattern was observed when the search difficulty was increased and when the presence of another individual was matched across pairs. The results are discussed in the context of task sharing, social loafing and current theories of visual search.

The leit motif of this thesis is that binding of visual features is a process that begins with input of stimulation and ends with the emergence of an object in working memory so that it can be further manipulated for higher cognitive processes. The primary focus was on the binding process from 0 to 2500 ms, with stimuli defined by location, colour, and shape. The initial experiments explored the relative role of topdown and bottom-up factors. Task relevance was compared by asking participants to detect swaps in bindings of two features whilst the third was either unchanged, or made irrelevant by randomization from study to test, in a change detection task. The experiments also studied the differences among the three defining features across experiments where each feature was randomized, whilst the binding between the other two was tested. Results showed that though features were processed to different time scales, they were treated in the same way by Visual Working Memory processes. Relevant features were consolidated and irrelevant features were inhibited. Later experiments confirmed that consolidation was aided by iconic memory and the inhibitory process was primarily a post-perceptual active inhibition.