Study of metals by low voltage SEM

Tato bakalářská práce se zabývá demonstrací výhod metody mikroskopie pomalými elektrony v oblasti materiálových věd. Rastrovací nízkoenergiov elektronová mikroskopie je mimořádně užitečná pro studium celé řady materiálů, jako jsou oceli, slitiny, keramika a tenké vrstvy. Experimentální část bakalářské práce byla provedena na rastrovacím elektronovém mikroskopu TESCAN VEGA TS 5130 vybaveném režimem katodové čočky, který se nachází na Ústavu přístrojové techniky AVČR, v.v.i..The aim of this thesis is to demonstrate the advantages of the scanning low energy electron microscopy (SLEEM) in the field of materials science. The SLEEM can be very effectively used for investigation of wide range of materials, such as steels, alloys, ceramics and thin films. Experimental part of this work was performed on the scanning electron microscope TESCAN VEGA TS 5310 equipped with cathode lens mode at Institute of Scientific Instruments of the ASCR, v.v.i..

Study of beta phase in Al-Mg-Si alloys by means of unconventional methods of electron microscopy

Hliníkové Al-Mg-Si slitiny nachází hlavní uplatnění především v automobilovém a stavebním průmyslu. Hexagonální ’ fáze je jednou z fází objevených v tomto typu slitin. Oproti klasické čtvercové -fází se vyznačuje rozdílnou krystalovou orientací vůči matrici a tvarem. Tradiční metodou pro jejich zobrazování je klasická rastrovací elektronová mikroskopie (SEM), navzdory tomu, že v mnoha případech neposkytuje dostatečné informace. Je to rychlé a efektivní, avšak není dostatečnou v případě tenkých nebo poškozených precipitátů v důsledku připravného metalografického procesu. Pozorovat a jednoznačně identifikovat tyto precipitáty by mohla pomoci rastrovací nízkoenergiová elektronová mikroskopie, která díky fyzikálním principům nabízí v porovnání se SEM řadu nezanedbatelných výhod jako jsou zmenšení interakčního objemu, zlepšení materiálového kontrastu i vyšší kontrast krystalografický.Aluminium Al-Mg-Si alloys are the most commonly used in automotive and construction industry. Hexagonal ’-phase is one of the metastable phases occured in this type of alloys. Unlike classic square -phase, this ’-phase is characterized by different crystalographic orientation to the matrix and shape. Standard method used for identification of aluminium alloys is scanning electron microscopy (SEM), because of its quickness and efficiency, but in case of very thin or damaged structures (as a result of metallographic process) it’s insufficient. Scanning low energy electron microscopy (SLEEM) can be appropriate for identification of mentioned precipitates due to its physical principles resulting in many advantages compared to SEM. So the most important benefits are interaction volume reduction (which leads to improvement of surface sensitivity), increase of material contrast (ability to change matrix / precipitates contrast) as well as crystalographic contrast.

Health Behaviors of College-aged Students During COVID-19

COVID-19 has compelled world leaders to implement new regulation designed to slow the spread of the pandemic, including mandated social distancing and stay-at-home orders. This project evaluated the effect the lockdown has had on the life-style habits of college-aged students through an online survey. Overall, 66% of participants reported that the lockdown resulted in a change in their overall health perception. Specifically, 70% of the survey participants reported decreased activity and 36% reported an increase in weight. Our study suggests the COVID-19 pandemic has resulted in a change in the overall health perception and health behaviors of college-aged students

The Effect of Affect and Trust on Commitment in Retail Store Relationships

This paper extends the study of relational exchange to retail markets. We propose that certain individual level determinants (perceived differences between stores and prior experience) are determinants of store commitment. Store trust and store affect are also modeled as intervening variables in the process. Survey data of consumers at a retail store with an affective environment provide evidence that experience is both directly and indirectly (through trust) related to store commitment, while perceived differences is indirectly related to store commitment through both trust and affect generated by the store

Michel Le Guern, Nicolas Beauzée, grammairien philosophe

Après avoir esquissé une courte biographie et rappelé les principes généraux qui ont guidé Nicolas Beauzée dans l’accomplissement de son œuvre, Michel Le Guern suit l’évolution de la pensée de ce «grammairien philosophe» depuis les articles rédigés pour l’Encyclopédie jusqu’aux trois volumes de l’Encyclopédie méthodique, en passant bien entendu par cet ouvrage savant et consciencieux, mais d’une métaphysique obscure, qu’est la Grammaire générale, ou Exposition raisonnée des éléments nécessair..

Teorie, interpretazioni e metodi dell'antropologia visuale

The following work aims at addressing the problems inherent in visual anthropology, especially with regard to the approach to the techniques of documentary and reportage photography. Also we want to provide a bibliography , organized in a synchronic , in which there is no division between photography and documentary. In order to address such research will analyze the technical evolution of the camera. In the historiography it was decided to begin the study of the graphic representations of the diaries or the works of travelers and missionaries. You will be taken to the first attempts to approach to ethnographic photography and filming. The third chapter is almost completely focused on the figure of Ernesto de Martino and filmmakers and photographers who have worked with him. A paragraph is focused on Sardinia documentary. The last chapter deals with the techniques of visual anthropology through the analysis of the techniques used , the types of documentaries, on the basis of these considerations, the proposal offers a possible approach to documentary. Will end up being two modes of image production as family photography and reportage, two kinds derived respectively from amateur photography and journalism, which are of great interest as containers of ethnographic data that can be called "passive" because it does not born to ethnographic interest

The Use of Statistical Methods for Data Processing

Diplomová práca prináša popis a finančnú analýzu konkrétnej akciovej spoločnosti. Následne je navrhnutý a vytvorený program s využitím jazyka VBA v prostredí MS Excel. Program spracováva účtovné výkazy a počíta hodnoty ukazovateľov finančnej analýzy. Užívateľ je schopný si výsledky zobraziť do grafu s možnosťou voľby trendu.Diploma thesis describes the company and analyzes the company from financial view. Afterwards, the software program based on VBA language in MS Excel environment is designed and made. The program analyses accounts and calculates the results of financial analysis. User is able to display the results in the graph with the possibility to display the trend.

Pierre «Émile» Fontanier. La rhétorique et les figures de la Révolution à la Restauration. Textes rassemblés et publiés sous la direction de Françoise Douay et Jean-Paul Sermain

En rééditant en un volume, en 1968, chez Flammarion, sous le titre Les figures du Discours, le Manuel classique pour l’étude des Tropes (1821) et Des figures autres que tropes (1827), de Pierre Fontanier, et en le présentant comme l’«aboutissement le plus représentatif et le plus achevé» de la rhétorique classique, Gérard Genette n’opérait pas qu’une exhumation, mais continuait et achevait, à 141 ans de distance, une des tentatives les plus rigoureuses pour définir le concept de figure et éta..

Marilia Marchetti, Retorica e linguaggio nel secolo dei Lumi. Equilibrio logico e crisi dei valori

Dans un court avant-propos, M. Marchetti annonce le contenu des six chapitres de son ouvrage – dont quelques-uns reprennent des travaux publiés précédemment – et élabore les défìnitions essentielles à la compréhension générale des thèmes abordés: du débat sur la langue tel qu’il se déroule dans les pages de l’Encyclopédie au discours révolutionnaire du «Pére Duchesne» en passant par le Dictionnaire philosophique de Voltaire, les Liaisons dangereuses de Choderlos de Laclos et les Victimes cloî..