La compréhension et la modélisation d'un contact lubrifié en présence de texturation nécessitent une description physique très fine pour comprendre les analyses contradictoires et pour expliquer les résultats très différents en termes de performance présentes dans la littérature internationale. De nombreuses études théoriques et expérimentales ont montré que la texturation des surfaces pourrait améliorer les caractéristiques tribologiques des contacts. La capacité de charge, le coefficient de frottement et la résistance à l'usure sont les principales caractéristiques susceptibles d'être améliorées. La texturation de surface fait appel à de nombreux paramètres géométriques, qui peuvent agir de façon très différente selon le contact. Enfin, les phénomènes supposés expliquer l'apport de la texturation ne font pas l'unanimité dans la communauté scientifique. Ainsi, les différentes contradictions font que ce domaine de recherche est en pleine évolution.Dans ce contexte scientifique, l'objectif principal de cette thèse est de conduire, à travers une étude théorique et numérique approfondie, vers une meilleure compréhension des effets induits par la texturation dans un contact lubrifié. Les paramètres géométriques, essentiels par rapport aux phénomènes physiques générés, font l'objet d'une analyse étendue. Les éléments théoriques obtenus à travers cette étude permettront une optimisation opérationnelle de tous types de dispositifs fonctionnant dans un milieu lubrifié. Parmi ces nombreuses applications, la butée en régime hydrodynamique a été choisie afin d'illustrer la pertinence des résultats de nos recherches. / Understanding and modeling a lubricated contact in the presence of surface textures requires a refined physical description in order to comprehend and explain the contradicting results that are currently presented in international literature. An increasing number of theoretical and experimental studies have shown that surface texturing could improve the tribological properties of lubricated or even dry contacts. The load-carrying capacity, the friction coefficient or the wear resistance are the main characteristics that can be improved through texturing. Nevertheless, the lubrication mechanisms that might explain these effects are still the subject of debate within the scientific community. These various contradictions have lead to a significant development of this particular field of research. In this scientific context, the main objective of this thesis is to lead, by means of a thorough numerical and theoretical analysis, towards a better understanding of the physical effects induced by surface texturing in lubricated contacts. The geometrical parameters, which are essential with regard to the generated effects, are submitted to a detailed investigation that also takes into account the influence of the operating conditions (surface speed, viscosity, ambient pressure etc.). The theoretical conclusions obtained throughout this investigation should lead to an improvement in texture design and should allow an optimization of most devices operating in lubricated conditions. Among these various applications, the hydrodynamic thrust bearing has been chosen in order to illustrate the relevance of our findings.

A première vue, le sujet des prises de participations dans les sociétés non cotées apparaît comme un sujet du droit des sociétés. Mais avec la présence du capital-investissement, des investisseurs institutionnels et des différents véhicules d’investissement, le sujet relève désormais du droit des affaires. En effet plusieurs techniques juridiques ont été créées par les praticiens afin de répondre aux besoins des investisseurs. Tel est l’exemple des actions de préférence, et des différents types de valeurs mobilières. C’est aussi le cas de la création des différentes modalités de prises de participations tels que la convention de portage d’actions ou la création d’une Holding de reprise. Les prises de participations dans les sociétés non cotées ne sont pas réglementées comme elles le sont dans les sociétés cotées. La liberté contractuelle est le principe qui prévaut. Les législations françaises et libanaises connaissaient des dispositions juridiques et commerciales similaires. Mais depuis plusieurs années, le droit français, influé par la pratique du droit international des affaires, et par les concepts anglo-saxon, a tellement évolué. Cela n’est pas le cas au Liban. Pourtant, la pratique du capital-investissement s’est fortement développée au Liban. Ainsi il s’agit, tout au long de cette étude, de préciser la notion de prise de participation et ses différentes modalités. Et aussi il semble opportun d’examiner l’applicabilité des principes de négociation et des nouvelles clauses accompagnant le contrat de cession d’actions ou parts sociales, par rapport au droit français et libanais / At first sight, the subject of “The acquisition of shares in non-listed companies” seems to be relevant to the corporate law. However, with the presence of the private equity, institutional investors and different vehicles of investment, the subject is more related to business law. In fact many legal techniques were created by practitioners to respond to the investor’s needs such as preferred shares and different securities; similarly the creation of different ways to acquire shares such as holding companies and the stock carrying agreement. There is no specific regulation for the acquisition of shares in non-listed companies. The principle of contractual freedom prevails. The French and Lebanese legislation contains many similar legal principles. Nevertheless, few years ago, the French laws, influenced by the international business law, and the Anglo-Saxon approach of the subject, have evolved. This was not the case in Lebanon, although the practice of private equity was developed in Lebanon. We will proceed through this study, to clarify the notion of acquisition of shares in non-listed companies, as well as the different techniques used. It is also useful to examine how much we can apply the negotiation principles and new clauses that often accompany the sale agreement of shares, in the context of Lebanese and French law

The focus of this study investigates the effect backpack weight has on the height of middle school students. It provides data about the effects of backpack weight on height that has not previously been determined. This study aims to contribute information to a growing body of evidence which supports the limitation of backpack weight for children to be no more than 10% of body weight.

This study investigates host community attitudes towards tourism in South Tyrol’s Puster Valley in Italy along with predispositions against the emerging phenomenon of overtourism and explores the factors influencing its formations, as similar research in the same European context with a more mature tourism industry is still underdeveloped. Applying quantitative methods, data was collected through an online survey between May and June 2021. A total of 17 attitude statements were analyzed using IBM’s SPSS and the results indicate that tourism impacts in the valley are perceived evenly throughout the whole community while it was proven with Social Exchange Theory that people involved within the tourism industry are less inclined to perceive negative impacts. Choosing the Pragser Wildsee as a case, the analysis further reveals that overtourism is not only affecting residents in its vicinity put has more far-reaching consequences. Even the results not being very surprising, the study is confirming tourism-related issues and suggests more need in investigating resident attitudes in similar environments.

The master thesis focuses on the design of a Load-carrying steel structure of railway bridge with bottom steel deck of the span of 28 + 45 + 23 m. The bridge is situated in the municipality of Třebestovice. Four variants of solution have been calculated. Two variants are made by plate main beams of variable profile, the next alternative was made by truss structure and the fourth variant consist of a combination of plate main beams with truss stiffener in the middle span. The most optimal solution was processed in detail. The calculations were done in compliance with valid ČSN EN norms.

The main aim of this master´s thesis is design and Cheb load-carrying steel structure of railway station in two variatons. A given object is situated in Ústí nad Orlicí.The steel structure is created by central nave, his dimensions is 30,0 x 30,0 m, and two secondary naves and his dimensions is 18,0 x 18,0 m.The central nave is two-storey height 12,4 m and secondary nave is single-storey height 5,5 m. Carrying building systém is created croos-column links, which are composed pipes. Cross-links are saved on fixed columns. The calculation was done through the use of Scia Engineer 2008 program and by myself alone.

Master's thesis deals with design and static solution of foundation slab of mountain hotel. Two calculation versions are made – simplified („inverse ceiling“) and calculation using software RF-SOILIN. This thesis also includes a comparison of both results. Reinforcement is designed for more accurate internal forces and the assessment of structure is performed according to the 1st limit state of capacity.

This master’s thesis deals with strength analysis rear frame of forwarder LVS 520 and propose modifications of this frame. The main part of this work is strength analysis of the supporting frame of the original construction by the help of the finite elements method. Further the design of suitable structural modifications and strength analysis of the modified construction of frame. This master’s thesis has been prepared with Strojírna Novotný s.r.o. company cooperation.

This master’s thesis deals with analysis of the gearbox housing of forwarder LVS 511. Theme is designed by Strojírna Novotný s.r.o. Objective of the work is to perform strain stress analysis of gear housing and main transmission shaft. The main part of the thesis is focused on creating of finite element model and evaluation in NX I-Deas software.

The object of this thesis is to design and assess steel structure of multi-storey office center in Nový Jičín. The object is supposed to have an rectangular shape with dimensions 54 x 72 m and roofed atrium in the middle. The object has 6 overground floors. Roof height is 29 m. Two construction variants were designed and assessed. Longitudinal and transverse rigity of variant A is ensured by truss bracings and variant B is braced by bracing frames. Floor structurs of both variants are made of steel secondary and primary beams, which are supported by steel columns. Facade and atrium roof cladding is made of glass panels.