Tesis sobre el tema "Wall covers"
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Parvatam, Pranav. "How the News Covers History: A Thematic Analysis of the New York Times and Wall Street's Journal's Coverage of Kamala Harris's 2020 Vice Presidential Campaign". Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103966.
Texto completoMaster of Arts
Kamala Harris made history on November 7, 2020, when she was elected as the first female Vice President of the United States. In addition to being the first woman, she became the first African-American and Indian-American to attain this position. Throughout her campaign, the media had to learn how to cover an historic candidate effectively, since this moment had no precedent. This thesis chose to explore The New York Times and The Wall Street Journal's coverage of her campaign because of their influence in shaping the news around the country and they both represent different sides of the political spectrum. Important events that are covered include the initial announcement, the convention speech, and the vice-presidential debate. This study looks to determine if the stereotypical frames that the media places on female candidates are still seen with Harris. Results indicated that although traditional media stereotypes were not a significant focus, Harris's identity brought about a new set of themes to analyze, with each paper focusing on different aspects. Implications of these results and future considerations for the media are discussed.
Brown, Alston Neal. "Factors affecting the nutritional composition and digestibility of corn for silage: Cover crops and cell wall composition". Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/78909.
Texto completoPh. D.
Masada, Teruhisa. "Structural performance of profile-wall plastic pipes under relatively shallow soil cover and subjected to large surface load". Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1174611925.
Texto completoAbe, Yoshihiro. "Cover times and extrema of local times for random walks on graphs". 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215283.
Texto completoDraebing, Daniel [Verfasser]. "Influences of Snow Cover on Thermal and Mechanical Processes in steep Permafrost Rock Walls / Daniel Draebing". Bonn : Universitäts- und Landesbibliothek Bonn, 2015. http://d-nb.info/1077289405/34.
Texto completoKneafsey, Kevin Patrick. "Two essays in finance: A test of the random walk hypothesis An examination of covered call strategies". Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284002.
Texto completoStipp, Rafael Nobrega 1982. "Caracterização dos regulons de CovR e VicRK em Streptococcus mutans". [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288682.
Texto completoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
Made available in DSpace on 2018-08-15T12:50:41Z (GMT). No. of bitstreams: 1 Stipp_RafaelNobrega_D.pdf: 11660668 bytes, checksum: b140f6b3e8ab94a99f86a4eee7101635 (MD5) Previous issue date: 2010
Resumo: S. mutans são os principais patógenos da cárie, pois expressam diversas proteínas importantes para a colonização e aumento em proporção nos biofilmes dentais na presença de sacarose. Estas incluem as glicosiltransferases (Gtf), que sintetizam uma matriz extracelular de glucano a partir da sacarose, e proteínas ligadoras de glucano (Gbps), as quais participam da interação entre S. mutans e matriz de glucanos. Há evidências de que diversos genes de virulência são regulados por sistemas reguladores de transcrição de dois componentes, dentre os quais CovR (de Control of Virulence) e VicRK (de Virulence Control). Propomos neste estudo descobrir novos alvos e/ou funções dos sistemas CovR e VicKR e avaliar características celulares e fenotípicas decorrentes da ausência desses sistemas. Para isso construímos cepas S. mutans mutantes knockout dos genes covR (SMU.1924) ou vicK (SMU.1517) e realizamos comparações com as respectivas cepas selvagens (WT). A caracterização dos transcriptomas foi triada por microarray e quantificada por qPCR, demonstrando que vinte e três genes foram super expressos na ausência de CovR, enquanto trinta genes foram reprimidos na ausência de VicK. Para demonstrar a regulação direta, as regiões promotoras destes genes foram submetidas a ensaios de retardamento da mobilidade eletroforética com as proteínas recombinantes CovR ou VicR. Além dos genes já conhecidos, os ensaios mostraram CovR como regulador negativo de quatro novos genes e VicR como regulador de cinco novos genes, dentre os quais há, em ambos os casos, genes com provável função na biogênese da parede celular. Nos ensaios fenotípicos, os mutantes covR- demonstraram diminuição no crescimento total em cultura, enquanto que os mutantes vicK observados por microscopia eletrônica de varredura apresentaram formação de cadeias extremamente longas com células atípicas. A formação de biofilme in vitro por mutantes covR- foi de 3 a 17 vezes maior comparado ao WT, enquanto mutantes vicK- demonstraram uma redução de 3,5 a 6,5 vezes. Foi observado aumento de 40% na hidrofobicidade celular nos mutantes covR- quando comparados a cepa WT, enquanto os mutantes vicK- tiveram aumento de 10 vezes, tornando-se altamente hidrofóbicos, provavelmente em decorrência das alterações na superfície da parede celular. Os mutantes covR- foram 30% mais resistente a autólise que as cepas WT, enquanto que os mutantes vicK- possuem o dobro de resistência. Em conclusão, os regulons controlados por CovR e VicKR incluem diversos genes com provável função na biogênese de parede celular, além de genes importantes para a formação de biofilmes. A inativação destes sistemas promoveu alterações fenotípicas notáveis, que realçam os achados daparticipação destes sistemas na biogênese das estruturas celulares. Palavras-chave: Análise em Microsséries, Parede Celular, Cárie Dental, Regulação Bacteriana da Expressão Gênica, Virulência.
Abstract: Streptococcus mutans, a major dental caries pathogen, expresses several virulence genes that mediate its growth and accumulation on tooth surfaces. In this process, GtfB and GtfC catalyze the extracellular synthesis of water-insoluble glucan matrix from sucrose, and are essential for accumulation of S. mutans in the dental biofilm. Glucan binding protein B might also mediate cell surface interaction with glucan. Two component transduction systems, such as CovR (Control of Virulence) and VicRK (Virulence Control), regulate, at least, part of S. mutans virulence genes. In this study we characterized CovR and VicRK functions and some phenotypic traits related to their absences. Knockouts strains covR- (SMU.1924) and vicK- (SMU.1517) strains were constructed and compared by differential microarray against wild type. Quantitative RT-PCR confirmed twenty-three up-regulated genes in covR-, while thirty down-regulated genes in vicKmutant. Recombinant CovR and VicR proteins were used in protein:DNA-promoter electrophoretic mobility shift assay (EMSA) to confirm direct regulator-promoter interaction and transcription. In addition to already-know CovR and VicR targets, qPCR and EMSA revealed that CovR acts as a negative regulator of four additional genes, and VicR controls five undescribed promoters. In both cases, genes controlled are mainly involved in biofilm growth and in cell wall biogenesis. Phenotypically, covR- mutants showed lower yield in culture, while vicK- mutants had altered cell morphology and long chains formation. Inactivation of covR significantly increased in vitro biofilm formation in all strains (3 to 17-fold increase, p<0.01), while vicK mutants showed poor biofilm growth (3.5 to 6.5-fold reduction; p<0.01). Cell hydrophobicity was increased by 40% in covR- mutants and by 10- fold in vicK- mutants, possibly due cell surface changes. Both knockoutsalso increased the autolysis resistance, in about 30% for the covR- mutants and in 2- fold for the vicK- mutant. It is concluded that CovR and VicR systems have important participation on S. mutans physiology, regulating genes that not only are involved in biofilm formation but that have functions in cell wall biogenesis.
Doutorado
Microbiologia e Imunologia
Doutor em Biologia Buco-Dental
Ravčuková, Markéta. "Polyfunkční struktura v Brně". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-354952.
Texto completoKrtička, Jakub. "Statické řešení bazénu v novostavbě horského hotelu". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226921.
Texto completoJurák, Vítězslav. "Novostavba farního kostela v Brně-Líšni". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227828.
Texto completoTunková, Martina. "Městské lázně". Master's thesis, Vysoké učení technické v Brně. Fakulta architektury, 2010. http://www.nusl.cz/ntk/nusl-215713.
Texto completoLiou, Zong-Yi y 劉宗宜. "On the Cover Time of a Random Walk". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/77544057860307492010.
Texto completo國立中山大學
應用數學系研究所
101
Imagine that a particle starts from the origin of the x-axis and moves at times t = 0, 1, . . . one step to the right with probability p or one step to the left with probability q = 1 − p. If p = q = 1/2, it is usually called a simple symmetric random walk and if p ≠ q, it is usually called a simple asymmetric random walk. For a simple random walk and a given positive integer n, define the cover time to be the time when the number of points visited has just increased to the given number n. In this thesis, we first review the cover time of a simple random walk on Z starting from 0. Then we study the cover time in a simple random walk starting from 0 with a reflection barrier.
Kuo, Yi Lung y 郭乙龍. "A Study on Warpage of Electronic Dictionary Battery Cover on Thin Wall Injection Molding". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/06113673570236519476.
Texto completo龍華科技大學
機械系碩士班
92
This study aims to improve the manufacturing process and warpage of the electronic dictionary battery cover in thin wall injection molding. The major technique is to replace the mainstream electronic dictionary battery cover made in insert molding with the thin wall electronic dictionary battery cover made in high-speed injection molding. The later has merely 0.2 mm in thickness, and its ratio of flowing length and thickness(L/T) can reach 338. The first step is MoldFlow numerical simulation to retrieve the data of best gate position and the sum. The second step is the molding window of applying ABS and PC+ABS respectively in molding the thin wall electronic dictionary battery cover. The third step is analyzing the best warpage and the influential parameters through applying ABS and PC+ABS respectively in Taguchi Method, and using some production to test and verify the best composition. The fourth step is applying ABS and PC+ABS respectively in short shots experiment of molding the thin wall electronic dictionary battery cover to compare the melt front of ABS and PC+ABS with the predictions of simulation; through 3D numerical simulation, in addition, simulating the variations of melt front of battery cover in three kinds of thickness: 0.2 mm, 0.5 mm, and 1 mm. The final step is utilizing stress viewer and SEM to observe the stress distributions and polymer orientation of part. The results of the experiments show that the molding window of ABS is larger than the molding window of PC+ABS, and that, via ANOVA analysis, detected the most important manufacture parameter are low melt temperature and high injection speed and high packing pressure which can ensure better warpage. The short shots experiment prove that the simulation and actual shaping have similar melt front, and that 0.2 mm product has hysteresis effect and race effect. After the enhancement, the production coasts of the thin wall electronic dictionary battery cover can largely lower, which can, on the contrary, largely raise the competition of the companies in this industrial circles.
WU, CHAO-CHING y 吳照慶. "A Study on the Warpage of the Top Cover with Thin Wall Injection Molding for the Digital Memory Box". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/36681981474139884028.
Texto completo明新科技大學
機械工程系精密機電工程碩士班
103
To reduce the material cost for the injected molding plastic parts, thin wall design becomes a main direction. But the process to obtain the thin-wall is encountered some thickness/distortion and warpage problems. How to improve and avoid this deformation caused by the thickness is really a major topic we need to think about. In my research, based on the consumer electronics digital top housing and below criteria, we will get the analysis by using the Conduct Computer Aided Engineering program Moldflow software and also the Taguchi method calculation. - length 220mm × width 160mm - uniformed thickness of 1.5mm - the material used is PC/ABS The result of the simulation proves the parameters that we need to concern about are the filling time, melted temperature, injection pressure, packing time, packing pressure, cooling time, and Cavity/core side temperature. The simulation result shows that by changing the core and the cavity side mold temperature will improve the warpage obviously. So we can conclude that choosing an appropriate parameter for the setup of the packing pressure, injection pressure, cooling time, can improve the effectiveness of 42.9% of warpage.
Chang, Ko-Lun y 張格綸. "Experimental study on the flow field of a wall-mounted finite cylinder with a round cover cap having different sizes". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/28640168697749877912.
Texto completo國立臺灣科技大學
機械工程系
104
The flow fields of a wall-mounted finite circular cylinder with a round cover cap having different sizes were studied experimentally in a vertical water tunnel by using Particle Image Velocimetry (PIV). A cylinder of the diameter (D) as 6.4 mm and the length (L) as 150 mm, giving the aspect ratio (AR) as 23.44, was mounted on the wall plane of the test section. Four round cover caps having the sizes of 1D (6.4 mm), 2D (12.8 mm), 3D (19.2 mm) and 4D (25.6 mm) were respectively mounted at the tip of the cylinder. Experiments were conducted for each cover cap size with Reynolds numbers as 250, 560 and 1080. This research studied the 3-dimensional downwash flow interacting with von Karman vortex near the tip of the cylinder. The experimental study focused on the flow fields around the tip of the cylinder with the cap. The range of experimental data was from the tip of the cylinder, X/D = 2, to the location of X/D = −13. The velocity fields of the wake flow were observed in two main planes (the transverse section, X-Y, plane and the cross section, Y-Z, plane). The local amplified velocity fields of the upstream flow passing the cover cap were observed on the transverse section, X-Y, plane. The cross section planes were observed at several different locations, which were near and away from the tip of the cylinder. The flow fields on the transverse section plane show that the X velocity component decreases in both the near and far wake regions close to the cylinder tip as the cap size increases. Accompanying the X velocity component disappearing away from the cylinder tip, high turbulence intensity of the Y velocity component takes place around the border region between the near and far wake regions. A singular source point was found in the wake region near the cap trailing edge for the cases with a 4D size cap and Reynolds numbers as 250 and 560.