Dissertations / Theses: 'AEM'

1

Gleiss, Dagmar. "Geschichte der Arbeitsgemeinschaft Evangelikaler Missionen, AEM 25 Jahre AEM, 1969-1994 /." Theological Research Exchange Network (TREN), 1994. http://www.tren.com.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Ackermann, Stefan [Verfasser]. "Zuverlässigkeitsuntersuchungen und Vergleich von AEM-Membran-Elektroden-Einheiten / Stefan Ackermann." Halle, 2018. http://d-nb.info/1175950521/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Huelsen, Mônica G. Von. "Interpretação de dados de eletromagnetometria aerotransportada (AEM) do sistema GEOTEM (domínio do tempo)." reponame:Repositório Institucional da UnB, 2007. http://repositorio.unb.br/handle/10482/6412.

Full text

Abstract:

Tese (doutorado)—Universidade de Brasília, Instituto de Geociências, 2007.
Submitted by wesley oliveira leite (leite.wesley@yahoo.com.br) on 2009-10-16T19:06:23Z No. of bitstreams: 1 Tese_Monica.pdf: 9433993 bytes, checksum: d3a660946335e5e79cce25743c0c1c02 (MD5)
Approved for entry into archive by Gomes Neide(nagomes2005@gmail.com) on 2011-01-11T17:21:05Z (GMT) No. of bitstreams: 1 Tese_Monica.pdf: 9433993 bytes, checksum: d3a660946335e5e79cce25743c0c1c02 (MD5)
Made available in DSpace on 2011-01-11T17:21:05Z (GMT). No. of bitstreams: 1 Tese_Monica.pdf: 9433993 bytes, checksum: d3a660946335e5e79cce25743c0c1c02 (MD5) Previous issue date: 2007
Desde 1950 estudos vem sendo realizados na aplicação da condutividade elétrica ao mapeamento geológico, com ênfase nos sistemas aeroeletromagnéticos. Estes sistemas usam o campo eletromagnético secundário obtido por contrastes em propriedades elétricas em subsuperfície em resposta a perturbações criadas por fontes eletromagnéticas naturais ou artificiais. A diversificação na aplicação do sistema EM, que são geralmente portáteis, permite inúmeras combinações geométrica e eletrônica do par de bobinas transmissora e receptora. Sua portabilidade permite que sejam utilizados nas vários levantamentos geofísicos, como nos de superfície que usam transmissores fixos e móveis e o receptor móvel, de subsuperfície (drill holes), e naqueles em que são portados em plataformas móveis (marítimas ou aéreas). Todo processo segue as leis de Maxwell e as respostas que são medidas dependem do modo em que se processa a medição (domínio da freqüência ou do tempo), dos equipamentos empregados e da geometria transmissor/receptor que formam com o alvo energizado. Não existe uma disposição ideal de transmissores e receptores, dependendo assim do tipo de estudo que se deseja realizar na área. Um dos sistemas disponíveis comercialmente já algum tempo, é o GEOTEM aerotransportado. Ele foi utilizado no vale San Pedro (sudeste do Arizona) em 1997. Os dados desta região nos foram disponibilizados pela USGS (United State Geological Survey) e foram utilizados para testar rotinas computacionais adaptadas nesta tese, para interpretar dado AEM, o que permitiu realizar uma análise quantitativa do modelo de condutividade da bacia sedimentar de San Pedro e sua relação com a hidrogeologia. Propõe-se aqui apresentar um procedimento de interpretação que pode ser utilizado para o dado AEM. Neste foram aplicadas duas técnicas: 1) a que obtém o comportamento da condutividade pela profundidade ao longo das linhas do levantamento; 2) a inversão de dados eletromagnetométricos para um sistema não linear. Esta última metodologia desenvolvida foi inicialmente aplicada a dados sintéticos, cuja inversão é do tipo controlada. Posteriormente a aplicação deste procedimento deu-se aos dados reais mencionados. iii As duas técnicas mostraram-se eficientes, sendo que a primeira exibiu um processo de inversão rápido e qualitativo e a segunda, menos rápido e quantitativo. Finalmente a proposta final foi em obter volumes com os resultados das medições eletromagnéticas no domínio do tempo (TDEM) para que se tenha uma visão 3D do modelo da condutividade da região em estudo. Para tanto serão apresentados os conceitos fundamentais do método eletromagnético aplicados ao sistema e escolhido (GeoTEMTM-Time Domain Airborne EM System) e os procedimentos de interpretação desenvolvidos. ______________________________________________________________________________ ABSTRACT
Since 1950 research has been carried out on the application of the electric conductivity for geological mapping, with the most effort put on airborne electromagnetic systems. These systems use the secondary electromagnetic field developed by contrasts in electric properties in the subsurface as response to disturbances created by natural or artificial electromagnetic sources. The many techniques developed in the use of those EM systems, which are commonly portable, imply in several combinations of how to combine physically and electromagnetically pairs of transmitter and receiver loops of different sizes and geometries. This resulted on the several modalities of use common to EM geophysical surveys, as those carried out on land using fixed and mobile transmitters and mobile receiver on surface, drill holes, airborne and in marine environment. All physical process follows the Maxwell laws of electromagnetism and the signals measured depend on the way that the measurement is accomplished (frequency or time domain), the type of the equipment used and on the geometry that the transmitter/receiver pair form with the energized target at the Earth. The ideal disposition of transmitters and receivers seems not to exist. It will depend on the kind of study is to be accomplished the area. GEOTEM is an airborne system that is available commercially for some time. It was used in San Pedro basin (southeast of Arizona) in 1997. The data of this survey was made available by the United State Geological Survey and it was used for testing the computer routines and programs developed. This software was used in this thesis to perform a quantitative analysis with the conductivity model for the San Pedro Sedimentary Basin and its relation to the hydrogeological targets envisaged with these studies. This research intends to present a procedure that can be used for an Airborne EM (AEM) interpretation. The methodology developed is first tested on synthetic models as to invert data generated by them in a controlled inversion scheme. Later on this procedure is applied to the real data mentioned. The intention is to obtain an interpretation map with the results of the electromagnetic measurements in the time domain (TDEM) and a 3-D visualization of the conductivity model obtained for the airborne electromagnetic survey in study. v The approach followed is that bared on fundamental concepts of the electromagnetic method applied to the system chosen (GeoTEMTM Time Domain Airborne EM System) and the interpretation procedures developed.

APA, Harvard, Vancouver, ISO, and other styles

4

Hansson, Marcus, and Desirée Svensson. "CSR och earnings management - agerar företagsledningen etiskt eller opportunistiskt? : En kvantitativ studie på kontinentaleuropeiska bolag." Thesis, Högskolan i Gävle, Avdelningen för ekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-29856.

Full text

Abstract:

Syfte: CSR är ett högaktuellt och viktigt ämne för företagen och deras intressenter. Då högre CSR- aktiviteter anses vara relaterat till etiskt agerande företagsledningar undersöker studien om företagens ledningar utnyttjar detta i försök att dölja omoraliska aktiviteter i form av earnings management. En opportunistiskt agerande företagsledning använder earnings management för att manipulera resultatet i önskad riktning, vilket kan göras genom diskretionära periodiseringar (AEM) eller via aktiviteter som påverkar kassaflödet (REM). Eftersom dessa fungerar som substitut så undersöks båda i studien. Studien baseras på kontinentaleuropeiska bolag där rättstillämpningen bygger på civil law. Dessa företag redovisar enligt IFRS och CSR-rapporterar efter GRI, vilket tidigare forskning pekat ut som faktorer som påverkar sambandet mellan CSR och earnings management. Syftet med studien är därför att undersöka om CSR används som ett medel för att dölja förekomsten av earnings management, samt om det finns stöd för ett opportunistiskt alternativt etiskt perspektiv. Metod: Studien har en kvantitativ forskningsmetod och tillämpar en positivistisk forskningsfilosofi med en hypotetisk-deduktiv ansats. Studien använder en tvärsnittsdesign med sekundärdata från kontinentaleuropeiska bolag över en tioårsperiod (2008-2017). Datan har hämtats från Thomson Reuters Datastream och analyserats i IBM SPSS. Resultat & slutsats: Resultaten indikerar att kontinentaleuropeiska företag agerar opportunistiskt och möjligtvis använder CSR i försök att dölja earnings management. Detta kan dock endast härledas till REM-aktiviteterna abnorma kassaflöden och abnorma produktionskostnader. Mellan CSR och AEM kunde inget samband redogöras. Därav dras slutsatsen att det är viktigt att earnings management studeras utifrån båda aspekterna för att erhålla ett rättvisande resultat. Examensarbetets bidrag: Studien bidrar till att fylla forskningsgapet gällande sambandet mellan CSR och earnings management i form av både AEM och REM. Resultaten är viktiga för företagens intressenter då de tyder på att högre CSR-engagemang inte är relaterat till mer etiskt agerande företagsledningar. Intressenterna bör främst vara vaksamma på aktiviteter som inte granskas av revisorer då dessa visats förekomma i högst utsträckning. Förslag till fortsatt forskning: I framtida studier kan sambandet mellan CSR och earnings management undersökas i företag där incitament till resultatmanipulation anses föreligga. Vidare kan ledningens syn på earnings management studeras mer ingående. Förslag ges även till att undersöka branschskillnader och att använda alternativa CSR-mått.
Aim: CSR is a highly topical and important subject for the companies and their stakeholders. Since higher CSR activities are considered to be related to ethically acting managements, this study investigates whether the management uses CSR as an attempt to conceal immoral activities in terms of earnings management. An opportunistic acting management uses earnings management to manipulate the result in the desired direction, which can be done through discretionary accruals (AEM) or through activities that affect the company’s cash flow (REM). Since these operates as substitutes, both are examined in the study. The study is based on Continental European companies where the application of law is based on civil law. These companies report according to IFRS and CSR reports according to GRI, which previous research pointed out as factors to affect the correlation between CSR and earnings management. The purpose of the study is therefore to investigate whether CSR is used as a means of concealing the existence of earnings management, and whether there is support for an opportunistic alternative ethical perspective. Method: The study has a quantitative research method and applies a positivistic research philosophy with a hypothetical-deductive approach. The study uses a cross-sectional design with secondary data from Continental European companies over a ten-year period (2008-2017). The data has been retrieved from Thomson Reuters Datastream and analyzed in IBM SPSS. Result & Conclusions: The results indicate that Continental European companies act opportunistically and uses CSR in attempts to hide earnings management. However, this can only be attributed to the REM activities abnormal cash flows and abnormal production costs. No relationship could be reported between CSR and AEM. Hence, it is concluded that it is important to study earnings management on the basis of both aspects to report fair results Contribution of the thesis: The study contributes to filling the research gap regarding the relationship between CSR and earnings management in both AEM and REM. The results are important for companies' stakeholders as they indicate that higher CSR involvement is not related to more ethical behavior of the company management. Stakeholders should primarily be vigilant on activities that are not audited by auditors as these have been shown to occur to the greatest extent. Suggestions for future research: In future studies, the relationship between CSR and earnings management can be investigated in companies where incentives for manipulation the financial performance are considered to exist. Furthermore, the management’s view of earnings management can be studied more thoroughly. Suggestions are also made to investigate industry differences and to use alternative CSR measures.

APA, Harvard, Vancouver, ISO, and other styles

5

Carvalho, Daniel Estima de. "Uma contribuição para a elaboração de mapas estratégicos: um estudo da aplicação do método de análise e estruturação de modelos (AEM)." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/12/12139/tde-09112009-142801/.

Full text

Abstract:

A complexidade do ambiente competitivo obriga as organizações empregar métodos cada vez mais sofisticados para trabalhar com sua estratégia corporativa. Uma das ferramentas discutidas academicamente e no meio corporativo, relacionada a gerir a estratégia empresarial, é o Balanced Scorecard, que possui, entre seus componentes, o Mapa Estratégico. Este estudo aborda a aplicação do método de Análise e Estruturação de Modelos (AEM), metodologia que lida essencialmente com temas complexos, na construção de Mapas Estratégicos. Os objetivos desta pesquisa consistem em entender se o resultado da aplicação da AEM contribui para a construção de Mapas Estratégicos, se este método colabora para uma maior participação das pessoas e se aprimora o processo de construção de um Mapa Estratégico. Foi realizada uma pesquisa experimental com uma amostra por conveniência de 110 alunos de pós-graduação de escolas de São Paulo, que participaram de um exercício de construção de Mapa Estratégico baseado em um caso real de uma empresa de gerenciamento de projetos de engenharia. Os grupos experimentais adotaram a AEM para construir seus mapas, enquanto que os grupos de controle construíram seus mapas no papel. Analisando os mapas construídos pelos grupos, como resultado apurou-se que o uso da AEM propiciou uma explicitação maior e mais abrangente das relações de causa e efeito existentes entre os diferentes objetivos estratégicos da empresa estudada. Já em termos das opiniões registradas nos questionários, a comparação entre os dois grupos trouxe apontamentos que evidenciam um processo mais estruturado, com a participação de cada integrante do grupo melhor distribuída, na construção dos mapas estratégicos dos grupos experimentais. Por outro lado, o grupo de controle foi mais enfático em destacar a aprendizagem de seus integrantes em relação à estratégia contida no caso e à concordância com o resultado do exercício, após construir seus mapas estratégicos no papel, apesar de o grupo experimental mostrar opiniões positivas sobre estes elementos também. Esta diferença de opiniões a favor do grupo de controle pode ter sido causada pelas melhorias que o software da metodologia AEM deveria passar na opinião dos respondentes, que, ainda assim, em sua totalidade, avaliaram positivamente o uso da ferramenta no exercício, como apoio à construção de Mapas Estratégicos. Por estes resultados, entende-se que existem evidências que apontam valer a pena utilizar a AEM nesta função, especialmente se seu software for aprimorado, tornando-se assim uma opção interessante para o apoio ao gerenciamento de estratégias empresariais por meio da construção de Mapas Estratégicos.
The complexity of the competitive environment requires organizations to adopt increasingly sophisticated methods to work with their competitive strategy. Among the tools discussed in both the academic world and the corporate milieu, is the Balanced Scorecard, which in turn has the Strategy Map among its components. This study approaches the application of the method of Interpretive Structural Modeling Structuring (ISM), a methodology essentially devoted to complex subjects, to the construction of Strategy Maps. This research aims at the following points: whether the employment of ISM could contribute to the construction of Strategy Maps; whether this method plays a role in making more people to participate; and whether it improves the process of construction of a Strategy Map. An experimental research has been conducted, with a convenience sample of 110 graduate students from business schools in the city of São Paulo who took part in an exercise of Strategy Map construction based on a real case of an engineering project management enterprise. The experimental groups employed the ISM to construct their maps, whereas the control group constructed their maps on paper. The ensuing comparison of the maps thus produced would show that applying the ISM allows for a greater and more comprehensive explanation of the causeeffect relations existing among the different strategy objectives of the company under study. As for the opinions recorded in the questionnaires, the comparison has provided evidence of a more structured process, with a better distributed individual participation within each group in the construction of strategy maps by the experimental groups. On the other hand, the control group has shown a deeper learning by its members in relation to both the strategy contained in the case and the agreement regarding the results of the exercise after constructing its strategy maps on paper, even though the experimental group has shown positive opinions regarding these elements as well. This difference in favor of the control group may have been caused by the improvements the ISM methodology software should have undergone, in the opinion of the respondents, all of whom, however, positively evaluated the tool in support to the construction of Strategy Maps during the exercise. Such results provide evidence that it is worthwhile to use the ISM in that function, especially if the software is improved, thus offering an interesting alternative for the support to the management of business strategies by means of the construction of Strategy Maps.

APA, Harvard, Vancouver, ISO, and other styles

6

Bertali, Giacomo. "Mechanistic understanding of Alloy 600 preferential intergranular oxidation : 'precursor events of stress corrosion cracking'." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/mechanistic-understanding-of-alloy-600-preferential-intergranular-oxidation-precursor-events-of-stress-corrosion-cracking(db6c7668-7cf5-4d50-a6bf-34eacf5b1216).html.

Full text

Abstract:

Primary Water Stress Corrosion Cracking (PWSCC) of Alloy 600 and similar Ni-Cr-Fe alloys is regarded as one of the most important challenges to nuclear power plant operation. During the past decades the majority of research has focused on PWSCC crack growth rate measurements in order to assess the lifetime of real components and to develop empirical models for crack propagation. However, the incubation and initiation stages of PWSCC have the same or even greater importance than the propagation stage, particularly because SCC can be undetected for more than 20 years before the occurrence of a rapid and catastrophic failure. There is, therefore, the scientific need to understand the mechanisms playing a fundamental role in the formation and development of intergranular cracks embryo, the so-called SCC initiation "precursor events", in order to be able to predict and mitigate the occurrence of PWSCC. Amongst all the models proposed for SCC initiation, the internal oxidation mechanism proposed by Scott and Le Calvar in 1992 appears to be the most comprehensive. Although the internal oxidation mechanism is widely accepted, it still requires further elucidation, especially in terms of enhanced grain boundary diffusivity and the role of intergranular carbides on the oxidation mechanism. The present work has focused on the initial stages of intergranular oxidation of solution-annealed (SA) and thermally-treated (TT) Alloy 600 with the aim of understanding the active mechanism responsible for the enhanced intergranular oxide penetration kinetics. The material was tested in simulated PWR primary water at 320°C, high-pressure hydrogenated-steam at 400°C and low-pressure H2-steam environment at 480°C at potential more reducing than the Ni/NiO equilibrium. The detailed microstructural characterization was conducted using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and analytical transmission electron microscopy (ATEM) and demonstrated that Alloy 600SA is susceptible to diffusion-induced grain boundary migration (DIGM), preferential intergranular oxidation (PIO) and localised Cr and Fe depletions at the grain boundaries. The similar analyses performed on Alloy 600TT demonstrated reduced susceptibility to PIO and grain boundary migration. Further, detailed analyses confirmed that intergranular carbides were readily oxidized/consumed in all 3 environments and acted as Cr reservoir/O trap. These results shed additional light on the "precursor events" for PWSCC of Alloy 600, especially on the mechanism responsible for the enhanced Cr and O diffusivity and on the mechanism responsible for the enhanced Alloy 600TT SCC initiation resistance. Moreover, the strong similarities in the Alloy 600 oxidation behaviour observed for the 3 different environments and at the 3 different temperatures suggested that the same PIO mechanism is active in both steam and water and at temperatures between 320°C and 480°C. These results strongly support the possibility of using the low-pressure H2-steam environment as a substitute environment to accelerate PWSCC initiation without changing the mechanism.

APA, Harvard, Vancouver, ISO, and other styles

7

Naderinasrabadi, Mahtab. "A Continuous Electrochemical Process to Convert Lignin to Low Molecular Weight Aromatic Compounds and Cogeneration of Hydrogen." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1584622583669502.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Abbassi, Noufel. "Chaînes de Markov triplets et filtrage optimal dans les systemes à sauts." Phd thesis, Institut National des Télécommunications, 2012. http://tel.archives-ouvertes.fr/tel-00873630.

Full text

Abstract:

Cette thèse est consacrée à la restauration et l'estimation des paramètres par filtrage dans les modèles de chaîne de Markov cachée classique, couple et triplet à sauts Markoviens. Nous proposons deux nouvelles méthodes d'approximation dans le cas des systèmes linéaires gaussiens à sauts Markoviens. La première est fondée sur l'utilisation des chaînes de Markov cachées par du bruit à mémoire longue, on obtient alors une méthode " partiellement non supervisée" dans la quelle certains paramètres, peuvent être estimés en utilisant une version adaptative de l'algorithme EM ou ICE, les résultats obtenus sont encourageant et comparables avec les méthodes classiquement utilisées du type (Kalman/Particulaire). La deuxième exploite l'idée de ne garder à chaque instant que les trajectoires les plus probables; là aussi, on obtient une méthode très rapide donnant des résultats très intéressants. Nous proposons par la suite deux familles de modèles à sauts qui sont originaux. la première est très générale où le processus couple composé du processus d'intérêt et celui des observations conditionnellement aux sauts, est une chaîne de Markov cachée, et nous proposons une extension du filtrage particulaire à cette famille. La deuxième, est une sous famille de la première où le couple composé de la chaîne des sauts et le processus d'observations est Markovien dans ce dernier cas le filtrage optimal exact est possible avec une complexité linéaire dans le temps. L'utilisation de la deuxième famille en tant qu'approximation de la première est alors étudiée et les résultats exposés dans ce mémoire semblent très encourageants

APA, Harvard, Vancouver, ISO, and other styles

9

Boyacioglu, Beril. "Microstructural Characterization Of Hypoeutectoid Steels Quenched From The Ae1 - Ae3 Intercritical Temperature Range By Magnetic Barkhausen Noise Technique." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12606921/index.pdf.

Full text

Abstract:

This thesis aims to examine the possibility of using Magnetic Barkhausen Noise technique in characterizing the ferritic-martensitic microstructure of hypoeutectoid steels quenched from the intercritical temperature range. For this purpose, rectangular specimens were prepared from SAE 1020, 1040 and 1060 steels. The specimens were heated at different temperatures within the intercritical temperature range and then quenched into water. Microstructures of the specimens were characterized by metallographic examinations and hardness measurements. The measurements of the Magnetic Barkhausen Noise (MBN) were performed by using both Rollscan and &
#956
SCAN sensor connectors. It was seen that, for specimens having identical carbon content, Barkhausen emission decreased as the heating temperature increased. Moreover, in specimens heated at the same temperature, Barkhausen emission decreased as the carbon content of the specimen increased. In both cases, the decrease in Barkhausen emission is associated with the increase in martensite content. The results indicate that MBN is inversely proportional to hardness and that MBN is very sensitive to the microstructural condition of the material. It has been shown that using MBN is a powerful tool for evaluating the microstructure of hypoeutectoid steels quenched from the intercritical temperature range and that the use of this technique could be extended to characterize industrial dual phase steels.

APA, Harvard, Vancouver, ISO, and other styles

10

Ericsson, Leif KE. "Growth and Characterization of ZnO Nanocrystals." Doctoral thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-27156.

Full text

Abstract:

The understanding of surfaces of materials is of crucial importance to all of us. Considering nanocrystals (NCs), that have a large surface to bulk ratio, the surfaces become even more important. Therefore, it is important to understand the fundamental surface properties in order to use NCs efficiently in applications. In the work reported in this thesis ZnO NCs were studied. At MAX-lab in Lund, synchrotron radiation based Spectroscopic Photoemission and Low Energy Electron Microscopy (SPELEEM) and X-ray Photoelectron Spectroscopy (XPS) were used. At Karlstad University characterization was done using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), Scanning Tunnelling Microscopy (STM), Auger Electron Spectroscopy (AES), and XPS. The fundamental properties of ZnO surfaces were studied using distributions of ZnO NCs on SiO2/Si surfaces. The conditions for distribution of ZnO NCs were determined to be beneficial when using ethanol as the solvent for ultrasonically treated dispersions. Annealing at 650 °C in UHV cleaned the surfaces of the ZnO NCs enough for sharp LEEM imaging and chemical characterization while no sign of de-composition was found. A flat energy band structure for the ZnO/SiO2/Si system was proposed after 650 °C. Increasing the annealing temperature to 700 °C causes a de-composition of the ZnO that induce a downward band bending on the surfaces of ZnO NCs. Flat ZnO NCs with predominantly polar surfaces were grown using a rapid microwave assisted process. Tuning the chemistry in the growth solution the growth was restricted to only plate-shaped crystals, i.e. a very uniform growth. The surfaces of the NCs were characterized using AFM, revealing a triangular reconstruction of the ZnO(0001) surface not seen without surface treatment at ambient conditions before. Following cycles of sputtering and annealing in UHV, we observe by STM a surface reconstruction interpreted as 2x2 with 1/4 missing Zn atoms.
Baksidestext The understanding of the surfaces of materials is of crucial importance to all of us. Considering nanocrystals (NCs), that have a large surface to bulk ratio, the surfaces become even more important. In the work in this thesis ZnO NCs were studied. The fundamental properties of ZnO surfaces were studied using distributions of ZnO NCs on SiO2/Si surfaces. Annealing at 650 °C in UHV cleaned the surfaces of the ZnO NCs enough for sharp LEEM imaging and chemical characterization while no sign of de-composition was found. A flat energy band structure for the ZnO/SiO2/Si system was proposed after 650 °C. Increasing the annealing temperature to 700 °C causes a de-composition of the ZnO that induce a downward band bending on the surfaces of ZnO NCs. Flat ZnO NCs with predominantly polar surfaces were grown using a microwave assisted process. Tuning the chemistry in the growth solution the growth was restricted to only plate-shaped crystals, i.e. a very uniform growth. The surfaces of the NCs were characterized using AFM, revealing a triangular reconstruction of the ZnO(0001) surface not seen without surface treatment at ambient conditions before. Following cycles of sputtering and annealing in UHV, we observe by STM a surface reconstruction interpreted as 2x2 with 1/4 missing Zn atoms.

APA, Harvard, Vancouver, ISO, and other styles

11

Wyant, Timothy Lewis 1965. "The generation of a murine mesangial cell line deficient in AE2 expression: Introduction of human AE1 into a murine cell line." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/290615.

Full text

Abstract:

Senescent cell antigen (SCA) is an antigen that was first identified on human erythrocytes. The formation of SCA is a normal cellular process which marks cells as old and/or damaged. This has been clearly demonstrated in the erythrocyte systems and is believed to occur in other cell types. SCA is formed from the breakdown of the major anion transport protein (Anion Exchanger, AE, or band 3). The mechanism for the formation of SCA is currently not understood. Research into the formation of SCA has been hampered by lack of in vitro models that allow the manipulation of the AE protein. Here, we describe the formation of two cell lines and a cell clone which may assist in the elucidation of the mechanisms of SCA formation by allowing AE manipulation. The murine mesangial Mes-13 cell line was chosen as the parental cell line. Initially, it was determined that Mes-13 cells express the Anion Exchanger 2 (AE2) form of AE. A cell line deficient in the expression of the AE2 protein was generated using an AE2 RNA antisense construct transfected into the Mes-13 cells. The expression of the AE2 protein was reduced by greater than 60 percent in one of the cell clones (A-8). A second cell expressing human AE1 was generated. Human AE1 was cloned using polymerase chain reaction from reticulocyte cDNA and placed into an expression vector. This vector, called Repbd3, was transfected into the Mes-13 cells and the A-8 clone. A 90 kD protein and a 45 kD protein reactive with anti-AE1 antibodies were shown to be expressed in the Mes-13 cells transfected with the Repbd3 construct. Only the 45 kD version was observed in a pooled A-8 cell line. In individually cloned A-8 cells transfected with the Repbd3 vector, expression of the 45 kD and 90 kD proteins were observed at low levels. The cells lines and vectors generated in this work will greatly assist in the understanding of the AE proteins, the elucidation of the mechanisms involved in the formation of SCA, and set up a system to determine residues critical for SCA formation by site-directed mutagenesis of human AE1.

APA, Harvard, Vancouver, ISO, and other styles

12

Almeida, Deniz Pedrozo de. "AEO." Florianópolis, SC, 2002. http://repositorio.ufsc.br/xmlui/handle/123456789/82328.

Full text

Abstract:

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Ciência da Computação.
Made available in DSpace on 2012-10-19T14:03:11Z (GMT). No. of bitstreams: 1 197383.pdf: 854414 bytes, checksum: e009a842e9e0148f1e1a79a8c829056d (MD5)

APA, Harvard, Vancouver, ISO, and other styles

13

van, Louw Trevor John Arthur. "Koloniale en post-koloniale onderwys in Suid-Afrika en die erkenning van diversiteit as teenvoeter vir diskriminerende praktyke in skole." University of the Western Cape, 2002. http://hdl.handle.net/11394/8482.

Full text

Abstract:

Philosophiae Doctor - PhD
This thesis examines the way in which the recognition of diversity can be applied as a strategy in South African education to erode the bitter legacy of colonial education. The establishment of formal education, built on a western foundation, was set up against a background of colonisation as a process aimed at political subjugation and economic exploitation. It is especially how education was utilised as a tool of colonisation in order to facilitate the above-mentioned subjugation and exploitation through a process of cultural subjugation that will be placed under the spotlight. In chapter three, the process of cultural subjugation outlined in chapter two, is related to the establishment and development of colonial education in South Africa and also how Apartheid was a form of internal colonialism with apartheid education continuing the process of cultural subjugation for political control and economic exploitation. Colonial subjugation was, however, not passively accepted by the subjugated. From the outset, subjugation spawned resistance and would eventually grow into large-scale opposition aimed at the overall casting off of the colonial yoke. This opposition eventually led to the political freedom of 1994. The political freedom of 1994 and the judicial framework for the dismantling of the legacy of colonial education would not, on its own or overnight, be able to dismantle the effects of centuries of subjugation. The dismantling of the inheritance of colonialism, together with colonial education, requires deliberate and constructive action. Such a process will have to include putting an end to the subjugation of the numerous voices characteristic of South Africa. Ending this subjugation does not mean the continuation of a position alongside and beneath a socially constructed dominant, but rather a process (a struggle?) where it can take its place impartially, alongside and equal to other voices in the greater diverse whole. It is against the above background that teaching strategies for the handling of diversity will be critically examined and for which recommendations are made for strategies, within the South African context, through which the dismantling of the colonial legacy of cultural subjugation for political control and economic exploitation can take place.

APA, Harvard, Vancouver, ISO, and other styles

14

Tchalala, Mohamed Rachid. "Croissance et réactivité du silicène." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112287/document.

Full text

Abstract:

L’objet de cette thèse est l’étude de la croissance de silicène sur des substrats d’argent,ainsi que l’étude de sa réactivité vis-à-vis de l’oxygène. La croissance a été réalisée sous ultra-vide et contrôlée par spectroscopie d’électrons Auger (AES) et par diffraction d’électrons lents (LEED). Les structures obtenues et leurs réactivités à l’oxygène ont été étudiées par microscopie à champ proche (STM et nc-AFM) et par spectroscopie de photoémission résolue en angle (ARPES). Nous avons étudié la structure interne des nano-rubans de silicène auto-assemblés sur un substrat d’Ag(110). Sur Ag(111) nous obtenons un feuillet de silicène qui présente différentes structures en fonction de la température du substrat. L’étude de la réactivité des rubans et des feuillets a montré que le silicène formé sur substrat d’argent est relativement stable vis-à-vis de l’oxygène ce qui ouvre des perspectives de fonctionnalisation du silicène. La dernière partie de cette thèse concerne la synthèse de feuillets de silicium par voie chimique. Nous avons mis au point une nouvelle méthode prometteuse de synthèse chimique qui nous a permis de synthétiser des feuillets de silicium de structure graphitique
The objective of this thesis is the study of the growth of silicene on silver substrates as well as its reactivity towards the oxygen. The growth was performed under ultra-high vacuum and controlled by Auger electrons spectroscopy (AES) and low energy electrons diffraction (LEED). The obtained structures and their relativities towards the oxygen were studied by near field microscopy (STM and nc-AFM) and by angle resolved electrons photoemission spectroscopy (ARPES). We have studied the internal structure of the selfassembled silicene nanoribbons on Ag(110) substrate. On Ag(111), we have obtained a silicene sheet presenting different structures versus the temperature of the substrate. The reactivity of silicene nanoribbons and sheets grown on silver show that silicene is relatively stable towards the oxygen which opens a new perspectives of functionalization of the silicene. The last part of this thesis concerns the synthesis of silicone sheets by chemical process. We have develpped a new promising process of chemical synthesis which allowed us to synthesize silicon sheets with graphitic structure

APA, Harvard, Vancouver, ISO, and other styles

15

Casas, Weisser Daniel Alejandro. "Presencia y distribución de amelogenina, citoqueratina AE1/AE3 y citoqueratina 14 en tumores odontogénicos, dientes con amelogénesis imperfecta hipocalcificada y gémenes denatrios." Tesis, Universidad de Chile, 2010. http://repositorio.uchile.cl/handle/2250/134115.

Full text

Abstract:

Trabajo de Investigación Requisito para optar al Título de Cirujano Dentista
Autor no autoriza el acceso a texto completo de su documento
Introducción: La odontogénesis es un proceso complejo, secuencial y altamente regulado en el que se forman estructuras calcificadas. Alteraciones en este proceso podrían dar lugar a diferentes tipos de enfermedades como alteraciones en el número de dientes y en la formación de esmalte, dentina y cemento. Otras lesiones que se pueden generar a partir de los tejidos remanentes de la odontogénesis son los tumores odontogénicos que derivan de tejido epitelial, ectomesenquimático y/o mesequimático presentando algunos de ellos matrices calcificadas. El objetivo del presente trabajo fue determinar la presencia y distribución de amelogenina, citoqueratina AE1/AE3 (pan citoqueratina) y citoqueratina 14 en tumores odontogénicos, dientes con amelogénesis imperfecta hipocalcificada y gérmenes dentarios. Materiales y métodos: Con técnicas inmunohistoquímica se examinó la presencia y distribución de amelogenina, citoqueratina AE1/AE3 y citoqueratina 14 en: 11 odontomas, 11 tumores odontogénicos adenomatoides (TOA), tres tumores odontogénicos quístico calcificante (TOQC), 2 tumores odontogénicos epitelial calcificante (TOEC), 2 dientes con amelogénesis imperfecta hipocalcificada (AIHC) y 3 gérmenes dentarios en desarrollo. Los tumores odontogénicos fueron obtenidos del Instituto de Referencia de Patología Oral (IREPO) de la Facultad de Odontología de la Universidad de Chile entre los años 1988 y 2008. Resultados: Se detectó amelogenina en la matriz de esmalte de odontomas, de dientes con AIHC y de gérmenes dentarios. Esto también fue observado en matrices calcificadas rodeadas por epitelio en TOA y TOQC y en células fantasmas presentes en odontomas y TOQC. Las citoqueratinas fueron detectadas en las células epiteliales de gérmenes dentarios y tumores odontogénicos estudiados. No se observó la presencia de citoqueratinas en dientes con AIHC. Conclusiones: Las proteínas amelogenina, citoqueratina AE1/AE3 y citoqueratina 14 son identificables a través de técnicas inmunohistoquímicas en algunos tumores odontogénicos que forman matrices tipo esmalte originadas por epitelio odontogénico y en gérmenes dentarios en desarrollo

APA, Harvard, Vancouver, ISO, and other styles

16

Cooper, Katherine. "AFM and C-AFM Studies of GaN Films." VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd/1246.

Full text

Abstract:

This thesis uses the techniques of atomic force microscope (AFM) and conductive AFM (C-AFM) to study the conduction properties of n-type GaN films. A total of 16 samples were examined and grouped according to their surface morphologies and conduction behaviors. The most common type of surface morpliology was that of Ga-rich samples having undulating "hillocks" with interspersed holes. Although most of the samples had this common morphology, their local conduction behaviors were not all similar. Local I-V spectra of the tip-sample Schottky contact could be grouped according to three major types: low leakage, high leakage, and "p-type". The highest quality samples with low leakage were usually grown at moderate temperatures (~650°C). For such samples, localized leakage only occurred at screw dislocations located at small pits terminating surface hillocks. I-V spectra taken on and off such hillocks were fit in forward bias to determine whether field emission or Frenkel-Poole conduction were dominant. Although field emission is a good fit compared to Frenkel-Poole, yielding reasonable values for the barrier height, the results are not yet conclusive without variable temperature studies.

APA, Harvard, Vancouver, ISO, and other styles

17

Arellano, V. Marcelo, and Godoy Gino Marcelo Bazo. "AES Water." Tesis, Universidad de Chile, 2016. http://repositorio.uchile.cl/handle/2250/144403.

Full text

Abstract:

TESIS PARA OPTAR AL GRADO DE MAGÍSTER EN ADMINISTRACIÓN
Marcelo Arellano V. [Parte I], Gino Marcelo Bazo Godoy [Parte II]
Las empresas relacionadas con el mercado del agua son diversas. Este vital elemento para la vida humana como para los procesos industriales es cada vez más escaso y requiere generar conciencia, compromiso e innovación en usar nuevas tecnologías disponibles para optimizar su uso. Llamaremos AESWater a quien será una empresa que se dedique a la comercialización de agua Industrial en el norte de Chile, aprovechando la plataforma de la central térmica de la zona de Mejillones. Su actividad será generar agua industrial, mediante el proceso de desalinización, particularmente a procesos mineros de la zona, de manera que puedan realizar sus actividades actuales y futuras sin el problema de abastecimiento de este vital elemento, cumpliendo con la nueva normativa, contribuyendo de manera significativa a iniciativas gubernamentales de la gestión del agua y cuidado del medio ambiente. Además, atenderá a clientes tales como, sanitarias y centrales térmicas, quienes necesitan de éste vital elemento para sus actividades. Este modelo de negocio es expandible a los otros sitios donde exista una central térmica costera. El tamaño de mercado potencial es de casi MMUS$1.6041 y en donde la industria de la “generación de agua industrial” es atractiva dada la poca presencia de esta tecnología a nivel nacional, existen pocos sustitutos, las barreras de entrada son altas, la competitividad en el mercado chileno es baja y existen restricciones gubernamentales, por ejemplo de la DGA2, a otorgar nuevos permisos. Referente a los clientes, éstos se identifican en diferentes mercados, lo cual reduce el riesgo debido a la diversificación. Los mercados objetivo detectados son Minería MMUS$ 383, Sanitarias MMUS$ 96 e Industria de la Energía MMUS$ 48 quienes poseen diferentes características por lo cual la estrategia de comercialización a utilizar para cada uno difiere dada sus necesidades. Por ejemplo en normativa, RSE3, en imagen, montos de gasto, etc. Evaluados estos segmentos por atractivo, dan como resultado que los primeros clientes a desarrollar están en los segmentos Minería y luego Sanitarias, la Industrial de la Energía requiere una calidad diferente pero alcanzable como parte adicional de proceso. Una de las actividades clave del negocio son los permisos ambientales vigentes, otro no menor es el costo de la energía dada la sinergia con la termoeléctrica, las capacidades operativas que en conjunto logran la oportunidad en la entrega y adaptabilidad a las necesidades de cada cliente. Esto sumado a un servicio post venta de seguimiento, dado que el relacionamiento con el cliente es (B2B) face to face es muy estrecho. En lo medio ambiental el valor en el negocio propuesto aporta con la disponibilidad del recurso hídrico en lugares alejados. Se busca ofrecer soluciones completas con mínimo impacto ecológico y utilizando energía a bajo costo. La oportunidad comercial es de una ventana limitada con contratos a largo plazo antes de la llegada de nuevos competidores, por lo que el ingreso es agresivo y rápido, apuntando a cubrir el mercado detectado en un plazo de 4 años. Los principales resultados obtenidos en la evaluación económica de este plan de negocio, son una VAN de MMUS$ 556,1, una TIR de 31,86%, con una Inversión Total (Activo + Capital de Trabajo) MMUS$ 410,31 y un Payback de 6 años.

APA, Harvard, Vancouver, ISO, and other styles

18

Vidal, Marc. "ANSYS AIM." Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-226188.

Full text

Abstract:

Für jeden am Entwicklungsprozess Beteiligten ist es wichtig möglichst früh das Konzept zu verstehen und bewerten zu können. Die Anforderungen an eine Simulationssoftware hierfür sind die elegante Einbindung in die CAD Umgebung, die einfache Handhabung und natürlich die Verfügbarkeit einer genauen Lösung von Magnetik, Strömung, Festigkeit und Kopplungen. ANSYS AIM erfüllt genau diese Wünsche. ANSYS AIM basiert auf den validierten Solvern von ANSYS Mechanical, ANSYS CFD und ANSYS Maxwell und bietet in einer einheitlichen Umgebung einen leichten und modernen Einstieg in die Multiphysicssimulation. Das ist der Schlüssel, um während der Konstruktion die Produkteigenschaften zu verstehen und optimieren zu können. Im Rahmen des Vortrages verschaffen wir uns einen Überblick über die Breite der Anwendungen: - Bewertung von Kühlkonzepten - Bestimmung des Druckabfalls in Armaturen - Festigkeitsbewertung in Baugruppen - Thermische Auslegung stromdurchflossener Bauteile - Elektromagnetische und thermische Beurteilung von Spulen http://www.cadfem.de/produkte/ansys/ansys-aim.html

APA, Harvard, Vancouver, ISO, and other styles

19

Lindsay, John Christopher. "Stress corrosion cracking and internal oxidation of alloy 600 in high temperature hydrogenated steam and water." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/stress-corrosion-cracking-and-internal-oxidation-of-alloy-600-in-high-temperature-hydrogenated-steam-and-water(1d6b037c-baf1-4397-a6c9-43835e7bb39a).html.

Full text

Abstract:

In this study, the possibility of using low pressure hydrogenated steam to simulate primary water reactor conditions is examined. The oxides formed on Alloy 600 (WF675) between 350 Celsius and 500 Celsius in low pressure hydrogenated steam (with a ratio of oxygen at the Ni/NiO to oxygen in the system of 20) have been characterised using analytical electron microscopy (AEM) and compared to oxide that formed in a high pressure water in a autoclave at 350 Celsius with 30 cc/kg of hydrogen. Preferential oxidation of grain boundaries and bulk internal oxidation were observed on samples prepared by oxide polishing suspension (OPS). Conversely, samples mechanically ground to 600 grit produced a continuous, protective oxide film which suppressed the preferential and internal oxidation. The surface preparation changed the form of the oxides in both steam and autoclave tests. The preferential oxidation rate has been determined to be K_{oxide} = Aexp{-Q/RT}with A = 2.27×10^(−3) m^(2)s^(−1) and Q = 221 kJ.mol^(−1) (activation energy) for WF675 and A = 5.04 × 10^(−7) m^(2)s^(−1) and Q = 171 kJ.mol^(−1) for 15% cold worked WF675. These values are consistent with the activation energy of primary water stress corrosion cracking (PWSCC) initiation. Bulk oxygen diffusivities were calculated from the internal oxidation after 500 h exposures. At 500 Celsius the oxygen diffusivity was determined to be 1.79×10^(−20) m^(2)s^(−1) for WF675 and 1.21×10^(−20) m^(2)s^(−1) for 15% cold worked WF675, the oxygen diffusivity at 400 Celsius in 15% cold worked WF675 was calculated to be 1.49×10^(−22) m^(2)s^(−1).The Cr-depletion associated with preferential oxidation has been assessed by AEM. The Cr-depletion was asymmetric and it could not be accounted for by local variations in the diffusion rate. Chemically induced grain boundary migration is suggested as a possible explanation. Constant load SCC tests conducted in hydrogenated steam at 400 Celsius have shown a similar trend to the classical dependency of PWSCC as a function of potential. The SCC samples were also prepared with two surface finishes, OPS and 600 grit. In all SCC tests, significantly more cracking was observed on the OPS surface and all failures initiated from this surface.

APA, Harvard, Vancouver, ISO, and other styles

20

Ūselytė, Gintarė. "Magnetroniniu plazminiu būdu suformuotų Mg - Al - Zr lydinių paviršiaus anodinio tirpimo tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080924_222847-13165.

Full text

Abstract:

Darbe tiriamas magnetroniniu plazminiu būdu suformuotų Mg-Al-Zr lydinių anodinis tirpimas, bei antikorozinės savybės. Magnetroniniu plazminiu būdu buvo suformuotos dangos su skirtingu cirkonio kiekiu (t.y. 95%, 90,4%, 76,2%, 71% ir 67%). Dangos formuojamos ant stiklo paviršiaus. Voltamperiniais ir elektrocheminio impedanso metodais ištirtas Mg-Al-Zr lydinių anodinis atsparumas ir korozinė elgsena 0.1 M (NH4)3BO3 + 0.1 M NaCl tirpale, kurio pH 8,5. MP lydinių korozinis atsparumas didėja, didinant Zr koncentraciją lydinyje. Taip pat lydiniai, kuriuose didesnė Mg koncentracija, bet mažesnė Zr aktyviai anodiškai tirpsta. Atominės jėgos mikroskopo metodu (AJM) nustatyta lydinių morfologija, dangos su didesne Zr koncentracija charakterizuojamos mažesniais kristalitų dydžiais. Aptartos MP metodo pritaikymo galimybės.
The goal of this work was to study anodic dissolution and anticorrosion properties of Mg-Al-Zr alloys formed by magnetron sputtering. Magnetron sputtering technique was applied to deposit Mg-Al-Zr alloys with different amount of Zr, on glass substrates. Anodic dissolution and anticorrosive stability of the sputtered alloys were studied by voltammetric and electrochemical impedance spectroscopy methods in 0.1 M (NH4)3BO3 + 0.1 M NaCl solution (pH 8,5). EIS and voltammetric measurements indicated a lesser anodic dissolution and a superior anticorrosive resistance in Mg-Al-Zr alloys with higher Zr concentration. Atomic force microscopy demonstrated (AFM) that by increasing amount of Zr in sputtered samples the grain size decrease.

APA, Harvard, Vancouver, ISO, and other styles

21

Wagner, Michael J. "AEW aircraft design." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23815.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Conocimiento, Dirección de Gestión del. "ACM Digital Library." Asociación de Maquinaria de Computación, 2004. http://hdl.handle.net/10757/655259.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Sjökvist, Peter. "Tillfällesverser på ABM-institutioner." Thesis, Uppsala University, Department of ALM, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-101558.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Rozmovits, Linda 1959. "A.M. Klein and modernism." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Rossell, Jacqueline. "Protein immobilisation for AFM." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404144.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Kopec, David M., and Jeff J. Gilbert. "AEF 130360 Overseeding Safety." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2004. http://hdl.handle.net/10150/216558.

Full text

Abstract:

Several items need consideration when products are evaluated for use as transition agents. These are (1) efficacy of ryegrass removal [rate of ryegrass decline and appearance of turf during transition], (2) tolerance and performance of incoming bermudagrass and (3) application safety for next season’s repeat overseed operations. This test was designed to evaluate application safety for the next overseeding which occurs in the early fall. Therefore, AEF was applied in the summer to bermudagrass turf prior to overseed operations. Most responses of the perennial ryegrass (overseed) turf to previous treatments of AEF 130360 occurred immediately after overseeding, from mid-October to early November. AEF 130360 applied 2 weeks before overseeding caused a significant decrease in seedling vigor, percent plot ryegrass cover, and percent bermudagrass plot straw present. Both AEF treatments applied closest to overseeding (2 weeks prior) had the least amount of initial ryegrass, the greatest amount of green bermudagrass, and later in the season, the most amount of straw (dormant) bermudagrass. Differences in turfgrass quality were not significant due to treatments at any time throughout the test, and most treatments ranked higher than the control in overall quality. Under the conditions of this test, application of AEF 130360 at either 0.64 or 1.28 ounces/product/M made one month before actual oversseding did not cause detrimental effects to ryegrass emergence, ryegrass cover, turfgrass color or overall quality.

APA, Harvard, Vancouver, ISO, and other styles

27

Vitolo, Giancarlo, and Balucani Daniel Alejandro Avila. "Valoración AES Panamá SRL." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/165794.

Full text

Abstract:

TESIS PARA OPTAR AL GRADO DE MAGÍSTER EN FINANZAS
Vitolo, Giancarlo [Parte I mediante el método de múltiplos], Avila Balucani, Daniel Alejandro [Parte II mediante el método de flujo de caja descontado]
El trabajo desarrollado a continuación, tiene como principal objetivo efectuar la valoración de la empresa AES Panamá SRL y estimar el precio de su acción, a través de la metodología de flujos de caja descontados (FCD). Esta metodología se basa en el modelo multiperiodo de Modigliani-Miller, que consiste principalmente en modelar los flujos de caja libre de la compañía sobre un horizonte de tiempo determinado, para luego ser descontados a su valor presente. Además de estos flujos de caja, el valor presente debe ser determinado para flujos de caja más allá del horizonte de proyección comúnmente llamado valor terminal o perpetuidad. Bajo esta metodología determinar la tasa de descuento es uno de los factores fundamentales. Para esto se deben considerar aspectos claves como el riesgo, comportamientos históricos y el rendimiento mínimo esperado por compradores o vendedores con una expectativa mínima de rentabilidad. En esta valoración utilizamos una tasa de costo de capital, calculada a través de la fórmula WACC, la cual consiste en un promedio ponderado entre el costo de la deuda (kb) y la rentabilidad exigida por los accionistas (kp). Para realizar la valoración a través de esta metodología, es necesario determinar una estructura de capital objetivo a largo plazo para la compañía, la cual puede obtenerse en base al análisis retrospectivo de las cifras presentadas en sus estados financieros. Como parte de la valoración completa de la empresa bajo este método, debemos identificar y adicionar sus activos prescindibles (activos no necesarios para la operación de la empresa) y ajustar el exceso o déficit de capital de trabajo que haya al momento de la valoración. Como último paso en esta valoración, se determina el valor económico del patrimonio restando al valor obtenido de la empresa el valor presente de la deuda financiera al momento de la valoración. Adicionalmente a la valoración a través del método de FCD, estimaremos el valor de la empresa AES Panamá SRL y el precio de su acción por el método de múltiplos. Este método consiste básicamente en estimar el valor de una empresa analizando la relación de las razones financieras de compañías que pertenecen a la misma industria tomadas como benchmark. AES Panamá, es una empresa que genera y vende electricidad en el mercado panameño y mercado eléctrico regional (MER), es la mayor compañía de generación en Panamá en términos de capacidad instalada y energía despachada promedio, donde el 93% de la capacidad firme de las plantas de la Compañía se encuentra contratada bajo varios acuerdos de compra - venta de potencia y energía con compañías de distribución, grandes clientes y la compañía generadora AES Changuinola. La energía excedente es vendida en el mercado ocasional a los precios establecidos en el mismo (precio spot) Para la ejecución de esta valoración se usaron los estados financieros de la empresa y de compañías que componen la industria desde el 30 de junio de 2013 hasta el 30 de septiembre de 2017, por otra parte, se extrajeron los datos presentados por la Bolsa de Valores de Panamá, donde pudimos compilar la información sobre de la estructura de capital, el patrimonio económico, principales competidores de la industria y estructura de la deuda y demás información necesaria para poder analizar, modelar y realizar las proyecciones de los flujos de caja de la empresa con un horizonte de evaluación de 5 años. Ya finalizada la valoración de AES Panamá al 30 de junio de 2017 con diferentes metodologías, obtuvimos como resultados que con el método de flujos de caja descontados el valor de la empresa o del patrimonio es de USD $1,067,808 en miles y un precio por acción de USD $4.97, por otro lado, el método de valoración en base a múltiplos de la industria, el ratio que presenta una mejor estimación es el del precio sobre ventas (Price to sales ratio) arrojando una estimación del valor de la empresa por USD $1,032,656 en miles y un precio por acción de USD $2.98. Debido a que AES Panamá es una empresa que no tranza o cotiza sus acciones en la Bolsa, actualmente no contamos con el valor efectivo de la acción a la fecha, solo tenemos como referencia en valor contable del precio de la acción. A pesar de no tener información pública comparable de la compañía, luego de realizar los procedimientos de valoración y analizar las estimaciones, consideramos que los resultados son lo suficientemente precisos para confiar en los valores que arrojan las diferentes metodologías aplicadas

APA, Harvard, Vancouver, ISO, and other styles

28

Dittmer, Drew E., and Joseph R. Bidwell. "Herpetofaunal Species Presence in Buffel Grass (Cenchrus ciliaris ) versus Native Vegetation‐Dominated Habitats at Uluṟu‐Kata Tjuṯa National Park." Digital Commons @ East Tennessee State University, 2018. https://doi.org/10.1111/aec.12557.

Full text

Abstract:

Buffel grass (Cenchrus ciliaris ) has been established in Uluṟu‐Kata Tjuta National Park since 1968. To date, the influence of buffel grass on the Park's flora and fauna has been largely unassessed. The objectives of this study were to determine if buffel grass dominates vegetation communities at the base of Uluṟu and if buffel grass habitats are associated with lower reptile and amphibian species richness than endemic vegetation communities. We used vegetation transects to measure the amount of buffel grass and genera of endemic vegetation at 26 sampling locations around the base of Uluṟu. The vegetation survey data were paired with pitfall trap data from reptile and amphibian captures at the same sampling locations. Indicator species analysis and non‐metric multidimensional scaling were used to analyse the vegetation and herpetofaunal community data. Our analyses determined five distinct vegetation communities around Uluṟu. At the base of Uluṟu, buffel grass dominated half of sampled areas and the rest of the inselberg's base was dominated by Themeda grasses. Buffel grass habitats had significantly higher herpetofaunal species richness than the Themeda habitats that dominated other areas at Uluṟu's base. Herpetofauna species richness in buffel grass‐dominated habitats was also significantly higher than all vegetation communities except for Triodia‐dominated habitats. These observations do not directly indicate that buffel grass presence promotes higher species richness of reptiles and amphibians since the observed patterns may be driven by factors such as proximity to breeding sites and abiotic variables not directly related to the grass itself.

APA, Harvard, Vancouver, ISO, and other styles

29

Wanner, Alexander [Verfasser]. "Seismic attenuation system (AEI-SAS) for the AEI 10 m prototype / Alexander Wanner." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2013. http://d-nb.info/1036694690/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Berggren, Emil, and Tobias Gustafson. "Jämförelse av GPGPU-ramverk och AES-metoder : Jämförelse av GPGPU-ramverk och AES-metoder för att besvara vilka GPGPU-ramverk och vilken AES-metod som bör rekommenderas för AES-kryptering med GPGPU." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Datateknik och informatik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-35856.

Full text

Abstract:

Sammanfattning Bakgrund - Dagens processorer börjar närma sig gränsen för hur höga klockfrekvenser de kan köras i. Detta har lett till att processorer har fått fler kärnor för att kunna exekvera flera processer parallellt med flertrådade applikationer. Det finns dock ofta en stor mängd oanvänd beräkningskraft under långa perioder då datorn är igång som ligger i grafikprocessorn, GPU. Då en GPU kan köra tusentals många fler trådar på samma gång än en CPU har ramverk för att göra mer generella beräkningar på GPU utvecklats, dessa kallas för GPGPU-ramverk. Då varje kärna på en GPU inte är lika stark som på en CPU ligger vinsten i att använda algoritmer som går bra att parallellisera. En sådan algoritm är krypteringsalgoritmen AES som är en av de säkraste och vanligaste krypteringsalgoritmerna som används idag. Syfte – Med hjälp av GPU-accelerering kan man kryptera med AES snabbare än med en traditionell CPU-lösning. För att göra GPU-accelereringen så effektiv som möjligt undersöker detta examensarbete vilken AES-metod samt vilket GPGPU-ramverk man bör välja. Metod – För att undersöka vilken/vilka AES-metoder samt vilka GPGPU-ramverk som var lämpliga att använda för denna undersökning gjordes två litteraturstudier. Utifrån data som litteraturstudierna gav genomfördes experiment för att jämföra de valda GPGPU-ramverken med den valda AES-metoden som ansågs vara mest lämpliga. Resultat – Från litteraturstudierna kom det fram att OpenCL och CUDA blir de rekommenderade GPGPU-ramverken och att CTR blir den rekommenderade AES-metoden för AES-kryptering med GPGPU-programmering. Utifrån experimenten som genomförts kunde det konstateras att CUDA är ett effektivare GPGPU-ramverk än OpenCL för AES-CTR på det testade grafikkortet, GTX 560. Implikationer – CUDA är snabbare vid större filer för att OpenCL begränsas mer av dataöverföringshastigheten än CUDA på ett GTX 560. Begränsningar – Experimenten genomfördes endast på ett grafikkort från Nvidia. Eftersom Nvidia inte har något intresse i att optimera för andra GPGPU-ramverk så kunde inte testresultaten från OpenCL verifieras med externa verktyg. Detta p.g.a. att Nvidias verktyg inte längre stödjer debugging eller profiling för OpenCL. Nyckelord – Processorer, GPGPU, AES, CTR, OpenCL, CUDA, GPGPU-ramverk
Abstract Background - Processors today are approaching the limit for how high clockfrequences they can run. This has led to that instead of trying to make them run faster they are instead made with multiple cores so they can utilize parallelization by running several threads in parallel. However aside from the CPU there is still the graphics card which has a large amount of unused computing power for long durations of time while the computer is active. While a GPU might not have as quick processors it instead has several thousands of them at the same time than a CPU which have led to the development of GPGPU-frameworks to use that potential parallelization. The profit in this lies in using algorithms and code functions that got high potential parallelization, one of which is the AES encryption algorithm. AES is one of the most widely used encryption algorithms today and also considered to be one of the most secure. Purpose – By using GPGPU-acceleration the encryption speed of AES is higher than by using a traditional CPU approach. To make the GPU-acceleration as effective as possible this study looks into which AES-method and which GPGPU-framework that should be chosen during development. Method – This study makes two literature studies to determine which AES-methods and which GPGPU-frameworks that are viable for GPU-acceleration of AES. Afterwards this study conducts experiments to determine which of these GPGPU-frameworks are the most effective. Findings – The conclusion drawn from the literature study is that the CTR-method among the AES-methods is preferable due to its parallelization potential and high security measures. Among the current GPGPU-frameworks only two frameworks satisfies the criteria determined from the literature study and those are CUDA and OpenCL. From the experiment the conclusion is thereafter drawn that of the two GPGPU-frameworks CUDA is more effective due to the bandwidth limits that OpenCL have compared to CUDA. This conclusion is valid on at least the tested graphics card, GTX 560. Implications – CUDA is faster at larger file sizes than OpenCL due to limited data transfer speed in OpenCL on a GTX 560. Limitations – The experiments were only conducted on one graphics card from Nvidia due to hardware constraints in that CUDA can only be run on Nvidia hardware. Due to this hardware constraint and Nvidia’s lack of support in their tools for debugging and profiling of OpenCL the results from the testing of OpenCL couldn’t be verified using external tools. Keywords – Processor, GPGPU, AES, CTR, OpenCL, CUDA, GPGPU-framework

APA, Harvard, Vancouver, ISO, and other styles

31

Griffiths, Michael Lee. "Multivariate calibration for ICP-AES." Thesis, University of Plymouth, 2001. http://hdl.handle.net/10026.1/1942.

Full text

Abstract:

The analysis of metals is now a major application area for ICP-AES, however, the technique suffers from both spectral and non-spectral interferences. This thesis details the application of univariate and multivariate calibration methods for the prediction of Pt, Pd, and Rh in acid-digested and of Au, Ag and Pd in fusion-digested autocatalyst samples. Of all the univariate calibration methods investigated matrix matching proved the most accurate method with relative root mean square errors (RRMSEs) for Pt, Pd and Rh of 2.4, 3.7, and 2.4 % for a series of synihelic lest solutions, and 12.0, 2.4, and 8.0 % for autocatalyst samples. In comparison, the multivariate calibration method (PLSl) yielded average relative errors for Pt, Pd, and RJi of 5.8, 3.0, and 3.5 % in the test solutions, and 32.0, 7.5, and 75.0 % in the autocatalyst samples. A variable selection procedure has been developed enabling multivariate models to be built using large parts of the atomic emission spectrum. The first stage identified and removed wavelengths whose PLS regression coefficients were equal to zero. The second stage ranked the remaining wavelengths according to their PLS regression coefficient and estimated standard error ratio. The algorithms were applied to the emission spectra for the determination of Pt, Pd and Rh in a synthetic matrix. For independent test samples variable selection gave RRMSEs of 5.3, 2.5 and 1.7 % for Pt, Pd and Rh respectively compared with 8.3, 7.0 and 3.1 % when using integrated atomic emission lines. Variable selection was then applied for the prediction of Au, Ag and Pd in independent test fusion digests. This resulted in RRMSEs of 74.2, 8.8 and 12.2 % for Au, Ag and Pd respectively which were comparable to those obtained using a more traditional univariate calibration approach. A preliminary study has shown that calibration drift can be corrected using Piecewise Direct Standardisation (PDS). The application of PDS to synthetic test samples analysed 10 days apart resulted in RRMSEs of 4.14, 3.03 and 1.88%, compared to 73.04, 44.39 and 28.06 % without correction, for Pt, Pd, and Rh respectively.

APA, Harvard, Vancouver, ISO, and other styles

32

Lee, Sunyoung S. M. Massachusetts Institute of Technology. "Chemical functionalization of AFM cantilevers." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34205.

Full text

Abstract:

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2005.
Includes bibliographical references (p. 47-52).
Atomic force microscopy (AFM) has been a powerful instrument that provides nanoscale imaging of surface features, mainly of rigid metal or ceramic surfaces that can be insulators as well as conductors. Since it has been demonstrated that AFM could be used in aqueous environment such as in water or various buffers from which physiological condition can be maintained, the scope of the application of this imaging technique has been expanded to soft biological materials. In addition, the main usage of AFM has been to image the material and provide the shape of surface, which has also been diversified to molecular-recognition imaging - functional force imaging through force spectroscopy and modification of AFM cantilevers. By immobilizing of certain molecules at the end of AFM cantilever, specific molecules or functionalities can be detected by the combination of intrinsic feature of AFM and chemical modification technique of AFM cantilever. The surface molecule that is complementary to the molecule at the end of AFM probe can be investigated via specificity of molecule-molecule interaction.
(cont.) Thus, this AFM cantilever chemistry, or chemical functionalization of AFM cantilever for the purpose of chemomechanical surface characterization, can be considered as an infinite source of applications important to understanding biological materials and material interactions. This thesis is mainly focused on three parts: (1) AFM cantilever chemistry that introduces specific protocols in details such as adsorption method, gold chemistry, and silicon nitride cantilever modification; (2) validation of cantilever chemistry such as X-ray photoelectron spectroscopy (XPS), AFM blocking experiment, and fluorescence microscopy, through which various AFM cantilever chemistry is verified; and (3) application of cantilever chemistry, especially toward the potential of force spectroscopy and the imaging of biological material surfaces.
by Sunyoung Lee.
S.M.

APA, Harvard, Vancouver, ISO, and other styles

33

Pogosian, Anna, and Katya Mehyeddine. "Marknadsanalys av AED i Norden." Thesis, KTH, Skolan för teknik och hälsa (STH), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-190937.

Full text

Abstract:

Varje år drabbas ca 10 000 människor av hjärtstopp utanför sjukhus och av dem är det endast 500 som överlever. Sannolikheten för överlevnad ökar upp mot 75% vid användning av hjärtstartare. Kandidatexamensarbetet gjordes i uppdrag av Servicia Medical, där målet var att analysera den nordiska marknaden för AED, utifrån att undersöka största återförsäljarna, attraktiva platser för placering av AED, prisutveckling och tillväxt. Marknadsundersökningen omfattar enbart Sverige, Finland och Danmark. För att ta reda på vilka återförsäljare som är störst utfördes en webbaserad informationssökning, samt telefonsamtal och mejlväxling med generalagenter. Data för attraktiva platser och tillväxt erhölls från olika verksamheter. Intervjuer, mejl och telefonsamtal utnyttjades för att få fram prisutvecklingen. Återförsäljarna delades in i två kategorier, där den ena avsåg företag som har fokus på första hjälpen och den andra företag med ospecifik fokusering. Information som krävdes för att undersöka vilka platser som är mest attraktiva, samt tillväxten i Finland och Danmark saknades. Gator och torg, tåg, buss, båt och spårtrafik är de mest attraktiva platserna för placering av AED i Sverige. Under de senaste fem åren har priset sjunkit i Sverige och Danmark. Tillväxten i dessa länder är olika där Sverige har en växande trend, medan Danmark har en ojämn och otydlig. Ingen slutsats kan dras för tillväxten i Finland.
Each year about 10 000 people get a cardiac arrest outside hospital and only 500 of them survives. Defibrillators are an efficient treatment for cardiac arrest, where the probability of survival increases up to 75%. This Bachelor project is done on behalf of Servicia Medical, where the goal is to analyze the Nordic market of AED by investigating the greatest retailers, the most attractive locations to place AED, price development and growth. The market research covers only Sweden, Finland and Denmark. To discover the greatest retailers, web-based research was performed as well as phone-calls and e-mail exchanges with general agents. Data for analyzing attractive locations and growth were obtained from various businesses. Interviews, e-mails and phone calls were used to derive price development. The found retailers were divided into two categories. The first category was companies that focus on first aid and the second one had a non-specific focus. Some Finnish and Danish businesses had a lack of required information to examine the most attractive locations and growth. Streets and squares, trains, busses, boats and rail traffic are the most attractive locations in Sweden to place AED. During the past five years prices have decreased in Sweden and Denmark. The growth in these countries is different. Whilst Sweden has a growing trend, Denmark has an uneven and unclear trend. No conclusion can be drawn for the growth in Finland.

APA, Harvard, Vancouver, ISO, and other styles

34

Гаража, В. О., О. П. Доренський, Vitaliy Garazha, and Oleksandr Dorensky. "Особливості програмної реалізації алгоритму AES." Thesis, ТНТУ ім. Івана Пулюя, 2012. http://dspace.kntu.kr.ua/jspui/handle/123456789/3015.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Лаврик, Тетяна Володимирівна, Татьяна Владимировна Лаврик, Tetiana Volodymyrivna Lavryk, and Д. Ю. Шепотько. "Візуалізація алгоритму симетричного шифрування AES." Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/65675.

Full text

Abstract:

З метою забезпечення захисту інформації криптографічні алгоритми, що використовуються для шифрування інформації, мають відповідати вимогам криптостійкості та надійності. Одним із таких алгоритмів є алгоритм Advanced Encryption Standard (AES).

APA, Harvard, Vancouver, ISO, and other styles

36

Лаврик, Тетяна Володимирівна, Татьяна Владимировна Лаврик, Tetiana Volodymyrivna Lavryk, and Д. Ю. Шепотько. "Візуалізація алгоритму симетричного шифрування AES." Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/64375.

Full text

Abstract:

З метою забезпечення захисту інформації криптографічні алгоритми, що використовуються для шифрування інформації, мають відповідати вимогам криптостійкості та надійності. Одним із таких алгоритмів є алгоритм Advanced Encryption Standard (AES).

APA, Harvard, Vancouver, ISO, and other styles

37

Burman, Gustav, and Simon Erlandsson. "ACM 9000 : Automated Camera Man." Thesis, KTH, Maskinkonstruktion (Inst.), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230253.

Full text

Abstract:

Today’s digital society is changing the way we learn andeducate drastically. Education is being digitalized with theuse of online courses and digital lectures. This bachelorthesis solves the problem of how to be able to record alecture without a camera operator, an Automated CameraMan (ACM), for easier production of high quality educationmaterial. It was achieved with a modularized designprocess, practical testing and a scientific approach. TheAutomated Camera Man can be placed in the rear of thelecture hall to record or stream the content while it activelyadjusts itself and its direction towards the lecturerusing image processing and analysis.
I dagens digitala samhälle är sättet som undervisning skerpå under ständig förändring. Undervisningen håller på attdigitaliseras genom användningen av nätbaserade kurseroch digitala föreläsningar. Detta kandidatexamensarbetesöker en lösning på frågan om hur man kan filma en föreläsningutan en kameraoperatör, med en automatiserad kameraman,för lättare produktion av högkvalitativt videomaterial.Genom en modulariserad designprocess, praktiska testeroch vetenskapliga studier, designades ett sådant system.Det automatiska kamerastativet kan placeras längst bak ien föreläsningssal, på vilket en kamera kan placeras för attspela in eller strömma filmmaterial medan stativet riktar insig mot föreläsarens position, med hjälp av bildbehandling.

APA, Harvard, Vancouver, ISO, and other styles

38

Subedi, Laxmi P. "AFM Tip-Graphene-Surface Interactions." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1291144388.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Tasini, Andrea. "Crittografia simmetrica: il sistema AES." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amslaurea.unibo.it/2641/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Chieco, Davide. "L'algoritmo advanced encryption standard (AES)." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7274/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Horwood, Michael. "Without aim : perception and naming." Thesis, Bangor University, 2014. https://research.bangor.ac.uk/portal/en/theses/without-aim-perception-and-naming(80d06eda-d801-4f0a-abef-06dc45de378a).html.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Miers, Charles Christian. "Modelo simplificado do cifrador AES." Florianópolis, SC, 2002. http://repositorio.ufsc.br/xmlui/handle/123456789/84201.

Full text

Abstract:

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Ciência da Computação.
Made available in DSpace on 2012-10-20T07:12:45Z (GMT). No. of bitstreams: 1 190173.pdf: 1149637 bytes, checksum: 3dba892952cb5e2fc288d4bd2af2f87f (MD5)
Nesta dissertação é descrito o desenvolvimento de um modelo

APA, Harvard, Vancouver, ISO, and other styles

43

Cherry, Shirley J. "AEC – Is It All That?" Digital Commons @ East Tennessee State University, 2006. https://dc.etsu.edu/etsu-works/2485.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

BURMAN, GUSTAV, and SIMON ERLANDSSON. "ACM 9000 : Automated Camera Man." Thesis, KTH, Mekatronik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-233140.

Full text

Abstract:

Today’s digital society is changing the way we learn and educate drastically. Education is being digitalized with the use of online courses and digital lectures. This bachelor thesis solves the problem of how to be able to record a lecture without a camera operator, an Automated Camera Man (ACM), for easier production of high quality education material. It was achieved with a modularized design process, practical testing and a scientific approach. The Automated Camera Man can be placed in the rear of the lecture hall to record or stream the content while it actively adjusts itself and its direction towards the lecturer using image processing and analysis.
I dagens digitala samhälle är sättet som undervisning sker på under ständig förändring. Undervisningen håller på att digitaliseras genom användningen av nätbaserade kurser och digitala föreläsningar. Detta kandidatexamensarbete söker en lösning på frågan om hur man kan filma en föreläsning utan en kameraoperatör, med en automatiserad kameraman, för lättare produktion av högkvalitativt videomaterial. Genom en modulariserad designprocess, praktiska tester och vetenskapliga studier, designades ett sådant system. Det automatiska kamerastativet kan placeras längst bak i en föreläsningssal, på vilket en kamera kan placeras för att spela in eller strömma filmmaterial medan stativet riktar in sig mot föreläsarens position, med hjälp av bildbehandling.

APA, Harvard, Vancouver, ISO, and other styles

45

Hegrová, Veronika. "Aplikace korelativní AFM/SEM mikroskopie." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402580.

Full text

Abstract:

This thesis is dealing with application of Correlative Probe and Electron Microscopy. All measurements were carried out by atomic force microscope LiteScope which is designed especially to be combined with electron microscopes. Advantages of Correlative AFM/SEM Microscopy are demonstrated on selected samples from field of nanotechnology and material science. Application of the correlative imaging was proposed and then realized particularly in case of low-dimensional structures and thin films. Further, this thesis deals with the possibility of combining Correlative AFM/SEM Microscopy with other integrated techniques of an electron microscope such as Focused Ion Beam and Energy Dispersive X-rays Spectroscopy.

APA, Harvard, Vancouver, ISO, and other styles

46

Andersen, Christopher. "The construction of carbon nanotube AFM probes for high resolution AFM of novel biological systems." Thesis, University of Nottingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421480.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Rinaldi, Ilaria. "Sulla Crittanalisi Logica del Cifrario AES." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

Find full text

Abstract:

Il compito di un cifrario è quello di trasformare un testo in chiaro in un altro messaggio, detto testo cifrato, che deve risultare incomprensibile a chiunque non conosca i dettagli della tecnica usata. Il cifrario preso in considerazione in questa tesi è Advanced Encryption Standard AES. In questa tesi si andrà a valutare la progettazione di AES tramite i Sat-Solver, applicando un attacco crittoanalitico di tipo logico.

APA, Harvard, Vancouver, ISO, and other styles

48

Ekelund, Øivind. "Low Energy AES Hardware for Microcontroller." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9096.

Full text

Abstract:

Cryptographic algorithms, like the Advanced Encryption Standard, are frequently used in todays electronic appliances. Battery operated devices are increasingly popular, creating a demand for low energy solutions. As a microcontroller is incorporated in virtually all electronic appliances, the main objective in this thesis is to evaluate possible hardware implementations of AES and implement a solution optimized for low energy consumption, suited for incorporation in a microcontroller. A good cost/performance balance is also a design goal. An existing solution based on a 32 bit architecture with support for 128 bit keys was chosen as a basis and altered in order to lower area and energy consumption. The alterations yielded a 13.6% area reduction as well as 14.2% and 3.9% reduction in energy consumption in encryption and decryption mode, respectively. In addition to alterations in the datapath, low energy techniques like clock gating and numerical strength reduction has been applied in order to further lower the energy consumption. The proposed architecture was also extended in order to accommodate 256 bit keys. Although this increased the area by 9.2%, the power consumption was still reduced by 7.6% and 1.3% in en- and decryption, compared to the architecture chosen as basis. As AES is an algorithm which easily can be parallelized, a high throughput solution utilizing a 128 bit datapath was implemented. This AES module is able to process 372.4 Mbps at an operating frequency of 32 Mhz and is based on the same architecture as the 32 bit datapath solution. In addition, this implementation yielded excellent energy per encryption figures, 24.5% lower than the 32 bit solution. The alternative to performing AES in a dedicated hardware module is to perform it using software. In order to have a basis for comparison, a software solution optimized for 32 bit architectures was implemented. Simulations show that the energy consumption attained when performing AES in the proposed hardware module is approximately 2.3% of what a software solution would use. In addition, the throughput is increased by a factor of 25. The architecture proposed in this thesis combines relatively high throughput with modest demands to area and low energy per encryption.

APA, Harvard, Vancouver, ISO, and other styles

49

von, Platen Henning. "Digitalisering inom ABM-området : Fyra projekt." Thesis, Uppsala University, Department of ALM, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-101576.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Allenstein, Frank. "LEED- und AES-Untersuchungen an Silicidschichten." Master's thesis, Universitätsbibliothek Chemnitz, 2003. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200300575.

Full text

Abstract:

Die Arbeit befasst sich mit dem Wachstum dünner CrSi2-Schichten auf Si(001). Die Schichtherstellung wurde mittels eines template-Verfahrens in einer MBE-Anlage realisiert. Die Charakterisierung der Schichten erfolgte mittels RBS,AES,LEED,REM,TEM,XRD sowie Widerstandsmessungen.

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic 'AEM'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles