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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
101

Influência do teor de silício na usinabilidade da liga de alumínio 6351 - avaliada através de força de corte e acabamento superficial / Influence of the silicon content in the machinability of the 6351 aluminium alloy analysed through cutting force and surface finish

Cunha, Daniel Fernandes da 14 March 2012 (has links)
Fundação de Amparo a Pesquisa do Estado de Minas Gerais / The aim of this work is to study the effect of silicon content in the machinability of CBA s (Compania Brasileira de Aluminio) 6351 aluminum alloy measured through cutting force and surface finish. In a first moment the effect of depth of cut (ap), cutting speed (vc), feed rate (f) and silicon content (% Si) on the machinability were investigated. The machining process used was turning operation with no cutting fluid. In a second part of the tests it was used MQF (60 l/h) and over head flood in experimental tests with constant depth of cut. For each set of parameters it was acquired values of cutting forces and surface roughness with two repetitions, adopting a 3k design of experiments. The results showed that the silicon content has significant effect in the machinability of the studied alloy compared to the others parameters investigated. Keywords: / O objetivo deste trabalho é a verificação da influência do teor de silício na composição da liga de alumínio 6351 da empresa CBA (Compania Brasileira de Alumínio) na usinabilidade avaliada através da medição da força de corte e do acabamento superficial. Em uma primeira etapa foi analisado estatisticamente o efeito dos parâmetros de corte, profundidade de corte (ap), velocidade de corte (vc), avanço (f) e porcentagem de silício (% Si) na força de corte e rugosidade superficial durante ensaios de torneamento cilíndrico externo sem aplicação do fluido de corte. Em uma segunda etapa dos ensaios utilizou-se fluido de corte aplicado através de MQF (60l/h) e jorro, mantendo constante a profundidade de corte e variando velocidade de corte e avanço. Para cada uma das combinações de parâmetros de corte foram adquiridos valores de força de corte e rugosidade superficial com duas réplicas para cada ensaio, adotando um planejamento fatorial 3k. Analise estatística de variância (ANOVA) mostrou que a porcentagem de silício exerce influência significativa nos parâmetros de usinabilidade avaliados da liga estudada quando comparado com avanço, velocidade de corte e profundidade de corte. / Mestre em Engenharia Mecânica
102

Analýza gólů ze vzájemných zápasů nejlepších čtyř týmů české fotbalové ligy ročníku 2018/2019 / Goal Analysis of mutual matches between the best four Czech teams in Czech football league season 2018/2019

Vampola, Jindřich January 2020 (has links)
Title: Goal Analysis of mutual matches between the best four Czech teams in Czech football league season 2018/2019 Objectives: The main objective of this thesis is analysis of goals scored between the best four Czech football teams in 2018/2019 season. Furthermore, this thesis aims for comparison of examined variables with data from European competition - Champions league (year 2018/2019). A partial goal then is to create recommended exercises for training practice. Methods: In this thesis is used methods of quantitative analysis and comparison. We mainly used the method of indirect observation of video records. Overall, 18 matches of Czech league and 125 matches of Champions league were analysed. In these matches were scored 47 goals in Czech league and 366 goals in Champions league. For normality analysis we used Kolmogorov-Smirnov and Shapiro-Wilk test. For hypothesis analysis we used Man Whitney U test and 2 sample t-test. With the results as a base were created model training exercises to bring the training process closer to match specifications. Results: Czech teams scored significantly more headers in comparison with Champions League. In first touch goals and fruitfulness of shooting they had lower percentage, but it was not statistically significant. Most of the goals in mutual matches of...
103

Psichikos sveikatos centro socialinio darbuotojo veiklos ypatumai / The features of the social worker's duties at the centre of psychiatric health

Gaidžiūnienė, Gitana 29 June 2009 (has links)
Magistriniame darbe nustatyti PSC socialinių darbuotojų veiklos ypatumai teikiant socialines paslaugas psichikos sveikatos problemų turintiems klientams; aptarti reikšmingiausi psichikos sveikatos riziką provokuojantys veiksniai, išanalizuoti teisės aktai, reglamentuojantys PSC socialinių darbuotojų veiklą, pateiktos trys išvados. 1. Reikšmingiausius psichikos sveikatos riziką provokuojančius veiksnius lemia išoriniai veiksniai: individuali biologinė – genetinė prigimtis, fizinė aplinka, socialinės – ekonominės aplinkybės, gyvenimo sąlygos, įvairūs politiniai, kultūriniai atributai ir šių veiksnių poveikyje išbūtas laikotarpis bei turėta galimybė apsispręsti sveikatos labui. 2. Teisės aktų, reglamentuojančių PSC socialinių darbuotojų, veiklą yra mažai. Iš jų pagrindinis – PSC vyriausiojo gydytojo patvirtinti socialinio darbuotojo pareiginiai nuostatai. Dažniausiai sprendimai priimami remiantis nekonkrečiomis LR psichikos sveikatos priežiūros įstatymo nuostatomis. 3. PSC socialinių darbuotojų veiklos ypatumai : • paslaugos teikiamos nestabilios psichinės sveikatos klientams, kurie nepajėgūs priimti savarankiškų sprendimų, neatsako už savo veiksmus, jų elgesys nenuspėjamas, dažnai lydymas klausos, regos haliucinacijų, persekiojančių kliedėjimo idėjų; • socialinė pagalba teikiama ,,čia ir dabar“, nes vizito laiko numatyti neįmanoma; • planuoti socialinį darbą sunku, kadangi veiklos sėkmę lemia kliento psichinės sveikatos būklė, nuotaika; • didžiausias pavojus socialinio... [toliau žr. visą tekstą] / There are established the main features of the social workers‘ duties by rendering social service to the patients with mental health problems; there are given the most significant factors of provoking the risk of mental health; there are analysed the statements of law regulating the social worker‘s duties at the Centre of Psychiatric Health; there are presented three conclusions at the master‘s-degree work. 1. The most significant factors that provoke the risk of the mental health are determined by the external factors: individual biological-genetic nature, physical environment, social-economic circumstances, life conditions, different political, cultural attributes, the period spent under the influence on these factors ant the contained possibility to decide about the helth welfare. 2. There are not enough statements of law that regulate the duties of the social worker at the Centre of Psychiatric Health. The most important are the social workers‘ official regulations confirmed by the head physician. The decisions are taken referring to the unconcrete regulations of the Psychiatric Health Care in the Republic of Lithuania. 3.The features of the social workers‘ duties at the Centre of Psychiatric Health are following: • the support is rendered for the patients with unstable mental health, that are unable to take self-dependent decisions, that cannot be responsible for their actions, that usually own hearing and sight hallucinations and are lead by delirium ideas; • the... [to full text]
104

Tai Chi poveikis Parkinsono liga sergančiųjų pusiausvyrai bei mobilumui. Klinikinių tyrimų analizė / Effects of Tai Chi on balance and mobility in patient with Parkinson‘s disease. Analysis of clinical trials

Petrauskaitė, Monika 19 June 2014 (has links)
Darbo objektas: Parkinsono liga sergančiųjų pusiausvyra, mobilumas. Hipotezė: Mes manome, kad Tai Chi pagerina žmonių, sergančių Parkinsono liga pusiausvyrą bei mobilumą. Darbo tikslas:nustatyti Tai chi poveikį Parkinsono liga sergančiųjų pusiausvyrai ir mobilumui. Darbo uždaviniai: 1. Analizuojant klinikinius tyrimus nustatyti Tai Chi poveikį sergančiųjų Parkinsono liga pusiausvyrai. 2. Analizuojant klinikinius tyrimus nustatyti Tai Chi poveikį Parkinsono liga sergančiųjų mobilumui. Tyrimo metodai Analizuojami straipsniai atrinkti pagal šiuos atrankos kriterijus:tiriamieji, kuriems diagnozuota Parkinsono liga, Tai Chi užsiėmimai, dviejų grupių palyginimas, vykdytas klinikinis tyrimas, naudota unifikuota Parkinsono ligos vertinimo skalė, matavimai pagal stotis ir eiti testą (angl. timed up and go test), naudotas kompiuterizuotas eisenos tyrimas (angl. GAITrite walkway system).Analizuoti 2 straipsniai, analizuojamuose tyrimuose dalyvavo 221 Parkinsono liga sergantis asmuo, iš jų 143 (64,71 %) – vyrai ir 78 (35,29 %) – moterys. Tiriamųjų amžiaus vidurkis 65,5 m. Rezultatai Tai Chi grupės tiriamieji pagerino eiseną, taip pat stotis ir eiti testo rezultatus, bei įvertinimą pagal UPLVS. Išvados 1. Pagal analizuojamų straipsnių duomenis Tai Chi pratimai pagerina Parkinsono liga sergančiųjų pusiausvyrą; 2. Pagal analizuojamų straipsnių duomenis Tai Chi pratimai pagerina Parkinsono liga sergančiųjų mobilumą. / Object of the study:balance and mobility in patient with Parkinson‘s disease. Hypothesis: We think that Tai Chi can improve balance and mobility in patient with Parkinson‘s disease. Aim of the study: analise clinical trials to determine the impact of Tai Chi on balance and mobility in patient with Parkinson‘s disease. Tasks of the study: 1. Analise clinical trials to determine the impact of Tai Chi on balance in patient with Parkinson‘s disease. 2. Analise clinical trials to determine the impact of Tai Chi on mobility in patient with Parkinson‘s disease. Methods The analized articles chosen following these criterias: participants with Parkinson‘s disease, Tai Chi exercises/sessions, at least 2 groups, clinical research, used unified Parkinson‘s disease rating scale, timed up and go test, computerized GAITrite walkway system. We analysed 2 clinical articles, there‘d been 221 participants with Parkinson‘s disease, from them 143 (64,71 %) and 78 (35,29 %) – women. Average of participants‘ age – 65,5 m. Results Tai Chi groups participants improved their gait, also they had better results in timed up and go test and UPDRS. Conclusions 1. According analysed trials Tai Chi exercises improved balance in patient with Parkinson‘s disease; 2. According analysed trials Tai Chi improved mobility in patient with Parkinson‘s disease.
105

UniCredit Bank - využití sponzoringu UEFA Champions League / UniCredit Bank - the sponsorship utilisation of UEFA Champions League

Křivanec, Ondřej January 2014 (has links)
Title: UniCredit Bank - the sponsorship utilisation of UEFA Champions League. Objectives: The main objective of this diploma thesis is to analyze the mutual relationship of sponsoring between the UEFA Champions League and UniCredit Bank. Based on the results, recommendations for improvement of the sponsorship cooperation will be suggested. Methods: In this thesis will be used survey in order to obtain the necessary information regarding the impact of the sponsorship from czech fans. Furthermore, SWOT analysis method will be realized to analyze the actual benefit of the sponsorship for UniCredit. And method of case studies which will analyze itself sponsorship with all its consequences. Results: The results will be processed according to the selected objectives and will be interpreted in a separate chapter as suggestions and recommendations for the improvement of the sponsorship. Keywords: sport, sponsorship, advertising, UEFA Champions League, UniCredit Bank
106

Závislost velikosti tržní hodnoty týmu na dosaženém výsledku v Synot lize / DEPENDENCY OF MARKET VALUE OF A TEAM ON THE RESULT ACHIEVED AT THE SYNOT LIGA

Zátopková, Kamila January 2016 (has links)
Title: Dependency of market value of a team on the result achieved at the Synot liga Objectives: The aim of this work is to determine the departmente of the market value of the teams which take place in the Czech Top Football league and their achieved results in this competition. Market value of the team is given by a sum of market value of all its players, regardless of their taking part in the match or not. It's put into the kontext with the final result in the league, which is expressed by a total sum of the gauner points. The partial aim is to determine effectiveness of these teams (expressed by total market value of the team) and the total sum of the points achieved in the competition Methods: Regressive and correlative analysis was used for determination of the dependence in the practical part of my research. Regressive analysis was taken from the assumption of free dependence. In this case the aim was to identify the degree of its intensity. So this is the way how the assumption that total market value of the team has certain influence on the achieved result in the league was checked. Results: In the results you can see characteristic and may be big influence of the market value of the team on the achieved result in the league. The value of correlative coefficient for the previous 9 sport...
107

Licenční systém v profesionálním fotbale na příkladu Gambrinus ligy / Licensing system in professional football in case of Gambrinus league.

Kučera, Pavel January 2011 (has links)
Title: Licensing system in professional football in case of Gambrinus league Objectives: The main aim of diploma thesis is description of licensing system in professional football in Czech Republic, which has to be observed by professional football clubs, if they want to get a professional licence. Without this required licence clubs can not figure in I. and II. league. The next object was the comparison of Czech football and German football. Methods: In thesis is used a method of interview, method of content analysis and method of comparison. Semistructured interview took main part in datas collection. The method of content analysis was used for analysis of these datas. The method of comparison was helpful for research of second aim of this diploma thesis, which was comparison between football in Czech republic and football in Germany. Results: This diploma thesis shows positive and negative of licensing system. Further describes differencies between Czech and German football. It recommends which way is the best for raise match attendance and make match more attractive like in Germany. Keywords: football, licensing system, interview, Gambrinus league
108

Das Verhältnis von Muskel- und Knochenmasse bei Kindern und jungen Erwachsenen mit Anorexia nervosa, Hypophosphatasie, Kraniopharyngeom und rheumatischen Erkrankungen / The relation of muscle mass and osseous mass with children and young adult with anorexia nervosa, hypophosphatasia, craniopharyngeoma and rheumatism illnesses

Hildebrandt, Lysann January 2008 (has links) (PDF)
Ziel der Studie lag in der Analyse des Zusammenhangs von Muskel- und Knochenmasse als Surrogat für Kraft und Knochenfestigkeit. In der vorliegenden Arbeit wurden 265 gesunde und chronisch kranke Kinder und Jugendliche auf ihre Körperzusammensetzung untersucht.(Anorexia nervosa: 40, Hypophosphatasie: 10, Kraniopharyngeom: 12 und juveniles Rheuma: 68, Referenzgruppe: 79 gesunde weissrussische Mädchen und 56 Jungen). Die Untersuchungsergebnisse der DXA Messungen bestätigen , dass die Knochenmasse als Surrogat für Festigkeit eng mit der Muskelmasse korreliert. Mit zunehmender Muskelmasse steigt auch der BMC an. Die Ergebnisse der Studie stehen im Einklang mit dem von Frost postuliertem Regelkreis, der einen kausalen Zusammenhang zwischen Muskelkraft und Knochenfestigkeit beschrieb. Generell zeigte sich, dass das Surrogat Knochendichte diesen Zusammenhang weniger scharf beschreibt als die Knochenmasse. Darüber hinaus fanden sich Störungen des Regelkreises, deren Ursachen zum Teil Gegenstand der Abklärung in weiterführenden Studien bleiben. / The aim of the study lay in the analysis of the connection of muscle mass and osseous mass as a surrogate for strength and osseous firmness. In the present work 265 became recovers and chronically ill children and youngsters on her body composition examined. (anorexia nervosa: 40, hypophosphatasia: 10, craniopharyngeoma: 12 and juvenile rheumatisms: 68, authoritative group: 79 healthy Belorussian girls and 56 boys). The investigation results of the measurements DXA confirm that the osseous mass correlates as a surrogate for firmness closely with the muscle mass. With increasing muscle mass also rises of the BMC. The results of the study stand in the harmony with the control circuit postulated by „Frost“ which described a causal connection between muscular strength and osseous firmness.In general appeared that the surrogate describes osseous density this connection less sharply than the osseous mass. In addition, disturbances of the control circuit whose causes remain partly an object of the clarification in continuing studies were found.
109

Obtenção de fios em ligas de cobre para utilização em linhas de transmissão e em eletrodos para contatos elétricos / Obtation of cooper-chromium-zirconium alloy wires for use in electrical transmission lines and electrodes for electrical contacts

Safra, Leandro Cesar Pereira Gomes 25 July 2011 (has links)
O objetivo do presente trabalho consistiu no desenvolvimento de fios de liga de cobre-cromo-zircônio (CuCrZr) em uma composição estabelecida em Cu-0,7%Cr- 0,1%Zr (em massa). Nas etapas desenvolvidas, foram feitos botões de cobrecromo (CuCr) e cobre-zircônio (CuZr) em um forno a arco elétrico de eletrodo não consumível, sendo esses botões, posteriormente, fundidos junto com cargas de cobre em um cadinho de alumina (Al2O3) inserido no interior de um vaso de aço inoxidável, que serviu como suporte. Após a fusão dos botões e cargas, o banho foi vazado em uma coquilha de cobre, obtendo-se os tarugos da liga de cobre. Dos tarugos em estado bruto de fusão, foram retiradas amostras para ensaios de dureza Vickers. Nesses tarugos foi feito um tratamento térmico de homogeneização a 910 °C por 2 h. Os tarugos foram posteriormente trabalhados mecanicamente a frio por forjamento rotativo seguido de trefilação, para obtenção final dos fios no calibre de 2,174 mm. Os fios passaram por dois tratamentos térmicos de recristalização, um a 510 °C por 1 h e outro de 480 °C por 5 h. Os fios foram caracterizados mecanicamente por ensaios de tração e de dureza e os resultados foram comparados com dados experimentais da literatura. / The objective of this work is the development of copper alloy wire-chromiumzirconium (CuCrZr) in a chemical composition Cu-0,7% Cr-0,1% Zr (weight). The main steps were, buttons were made of copper-chromium (CuCr) and copperzirconium (CuZr) in an electric arc furnace, these buttons were later melted with copper charge in a alumina crucible, placed inside a stainless steel can which served as a support. After melting buttons and charge, the bath was poured into a copper chill mold obtaining copper alloy billets. From the as cast cooper alloy billets, small samples were cut for Vickers hardness and then, a homogenizing heat treatment at 910 °C for 2 h was performed. The billets were then mechanically cold worked by swaging followed by drawing to obtain the wires with a diameter of 2,174 mm. The wires are mechanically characterized using tensile and hardness testing after recrystallization heat treatment at 510 °C for 1 h and at 480 °C for 5 h and the results were compared with experimental data from literature.
110

Estudos dos mecanismos envolvidos em processos de endurecimento superficial a laser de ligas a base de alumínio / Studies of the mechanisms involved in the laser surface hardening process of aluminum base alloys

Silva, Luciana Ventavele da 14 February 2011 (has links)
As ligas de Al-Si são amplamente utilizadas na indústria em substituição ao aço e o ferro fundido nos setores de alta tecnologia. A importância comercial dessas ligas deve-se principalmente ao seu baixo peso, excelente resistência à abrasão e à corrosão, alta resistência em temperaturas elevadas, baixo coeficiente de expansão térmica e menor consumo de combustível que proporciona redução considerável de emissão de poluentes. No presente trabalho, uma liga de Al-Si utilizada na indústria automobilística para fabricação de pistões de motores de combustão interna, foi submetida a tratamentos superficiais de refusão a LASER (Nd:YAG, λ = 1,06 m, modo pulsado). A radiação laser possibilita diversas concentrações de energia com precisa transferência dela para o material sem contato físico. A transferência intensa de energia provoca a ocorrência de modificações estruturais na camada superficial do material. Experimentos com pulsos únicos e trilhas foram realizados sob diferentes condições de processamento LASER com o intuito de analisar as mudanças microestruturais resultantes dos tratamentos e seus efeitos sobre a dureza. Para a caracterização da camada endurecida foram utilizadas as seguintes técnicas: microscopia óptica (MO), microscopia eletrônica de varredura (MEV), espectroscopia por energia dispersiva (EDS), mapeamento de raios-X, ensaios de microdureza Vickers e de rugosidade máxima. Após os tratamentos superficiais de refusão a LASER da liga Al-Si, a alta taxa de resfriamento resultante causou mudança na microestrutura devido ao refinamento das partículas de silício eutético primário presentes na liga, resultando em aumento de dureza. / The Al-Si alloys are widely used in industry to replace the steel and gray cast iron in high-tech sectors. The commercial importance of these alloys is mainly due to its low weight, excellent wear (abrasion) and corrosion resistance, high resistance at elevated temperatures, low coefficient of thermal expansion and lesser fuel consumption that provide considerable reduction of emission of pollutants. In this work, Al-Si alloy used in the automotive industry to manufacture pistons of internal combustion engines, was undergone to surface treatments using LASER remelting (Nd:YAG, λ = 1.06 m, pulsed mode). The LASER enables various energy concentrations with accurate transfer to the material without physical contact. The intense energy transfer causes the occurrence of structural changes in the superficial layer of the material. Experiments with single pulses and trails were conducted under various conditions of LASER processing in order to analyze microestrutural changes resulting from treatments and their effects on the hardness. For the characterization of hardened layer was utilized the following techniques: optical microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), x-ray mapping, Vickers microhardness and maximum roughness tests. The high cooling rate caused a change in the alloy structure due to the refinement of the primary eutectic silicon particles, resulting in increase of the mechanical properties (hardness) of the Al-Si alloy.

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