Tesi sul tema "Wall covers"

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. As a result, the media had to grapple with how to cover her historic campaign from the moment she was announced as the vice-presidential selection. This qualitative thematic analysis examined The New York Times and The Wall Street Journal's coverage of her campaign with significant analysis on important events such as the initial buzz surrounding her selection, the convention speech, and the vice-presidential debate. Specifically, this study examines 70 news articles total from both newspapers from August 11-November 3, 2020 to determine the recurring themes from her coverage. Results indicated that although traditional media frames and themes were not a significant focus, Harris's intersectionality brought about a new set of frames to explore, with subtle differences between the two newspapers. Implications of these results and future considerations for the media are discussed.
Master 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.

Corn silage is one of the major components in dairy cattle rations in the United States. Many factors affect the nutritional composition of corn for silage, such as cropping system, including cover crops, and the composition of the corn plant cell wall. The objectives of the first study were to determine the nutritional quality of different winter crops for silage and to determine the impact of the various winter crops on the succeeding productivity of corn and sorghum. Experimental plots were planted with 15 different winter crop treatments: 5 winter annual grasses in monoculture or with one of two winter annual legumes (crimson clover [CC] and hairy vetch [HV]). After harvesting the winter crops, each plot was planted with either corn or forage sorghum. Crimson clover increased DM yield compared to monocultures but HV did not. Adding legumes increased the crude protein concentration, but reduced the fiber and sugar concentrations of the forages. Even though in vitro neutral detergent fiber digestibility was reduced with the addition of legumes, the concentration of highly digestible non-fibrous components is greater in the mixtures than the monocultures, increasing the nutritive value of the silage. The objective of the second study was to determine the cell wall (CW) composition along the corn stalk. Three phytomers of corn plants were examined: center (C) of ear insertion, upper (U) and lower (L) phytomers. Each phytomer was cut into 4 sections: top (T), middle (M), bottom (B), and node (N). The CW, uronic acid (UA), glucose (GLU), and lignin concentrations did not change among phytomers. The concentrations of arabinose (ARA) and xylose (XYL) were greater in the U than in the L phytomers. Concentrations of CW, ARA, and XYL increased from B to T within the phytomer, but UA and GLU concentrations decreased from B to T. Lignin did not change within the phytomer. In mature corn for silage, changes within the corn internode may be more useful in determining how the environment changes the CW.
Ph. D.

The Random Walk Hypothesis (RWH) when applied to stock prices makes strong statements about such things as serial correlation and momentum in stock returns and about the information carried in the path of the stock price. Its significance to Finance has motivated many tests of the RWH. This paper, using data from 1963-1997, tests the RWH and then evaluates those tests using simulated data. We find that the data reject the RWH and that rejections are stronger using NASDAQ firms than they are with NYSE/AMEX firms. The time series properties of the rejection of the RWH suggest that recently prices more closely conform to the properties of a random walk than they did in the more distant past. The simulation results show that if the true underlying price process is a random walk, market imperfections such as price discreteness are sufficient to reject the random walk hypothesis. The time series properties of the rejection of the RWH are consistent with a narrowing of the bid ask spread through time. Covered call strategies are touted as win-win strategies. If share prices rise strongly then shares are sold and the gain is locked in. If share prices are flat or fall then the premiums from the sale of the call options act as additional income to supplement the poor performance of the stocks. The last two chapters in this paper compare covered call strategies to a simple buy and hold strategy, using data from 1989-1998. The results show that the buy and hold strategy out-performs the covered call strategy over this period even after adjusting for systematic risk and co-skewness with the market. Empirical comparisons of buy and hold and covered call strategies are period dependent and difficult to generalize as market performance plays a key role. Bootstrapping and simulation provide control over market returns. Both simulated and empirical analyses consider transactions costs and taxes as well as account for the different risk assumed under each strategy.

Orientadores: Renata de Oliveira Mattos-Graner, Jose Francisco Hofling
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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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

The topic of this diploma thesis is to revitalise of one city block and to maximise of its utilisation with combination of many different functions on this concrete area. This work is based on pre-diploma project in previous semester. This project ensures many possible functions for the inhebitants and also reflects natural differentiation between privat and public usage with impact on high quality of living space and appropriate public transport. Designed build-up area is situated betveen Veveri, Kounicova and Pekarenska streets in Brno. Patterns of this area are essential for the treatment of this project when both diagonaly and verticaly crosses whole area. Substance and space treatment reflects nearby structures and is naturally connected to it. Main substance of object is divided to three blocks via communications which crosses the area. Innerblock is sedated with green vegetation, connected to transit parter with shops and services. On the parters roof there is green walk-designed cover for inhabitants and after there are higher houses. Whole building complex is closed with rambling fractional roof covers with terraces of storeyed flats. This space structure is horizontally divided by its functions. In this project there are underground garages, shops and services, administrative spaces and space for rent and mostly flats for living. Fundamental look of the building is created by external rendering covering most of building which is connected to nearby structures. Shopping mall and separate blocks and also entrances to buildings and terraces/balcony are formed by taking off the substance by which leads to its fractionalism.

The static solution at the new building mountain hotel The thesis deals with design and static calculation of pool tank, which is supported by columns and walls. Pool tank is designed as swimming pool with plan dimension 25 x 10 meters and with changing depth from 1,2 to 1,8 meters. The support of pool tank is in distance 5,02 x 5,05 meters. The adjacent ceiling is placed on the walls of tank and separates pool and technical areas. The calculations of inner forces were realized by computational programm for two models a) without decline of supports, and model b) with decline of supports. The design of reinforcement is performed for the bottom and walls of tank. The deformations modeling was made at the other part of the thesis. All results were evaluated and summarized at the conclusion. Drawing documentation was made subsequently.

This diploma thesis, called „Parish church, Brno-Líšeň“, is compiled as documentation for building construction. There is one complex building situated in slope. Therefore it consists of one partly underground floor and first floor. It is divided into three sections. Central part is designed as round-shaped body of the church with tower in the southern part of the church. Shed roof has an angle of 7° for body and an angle of 13° for tower. From the western side there is an administrative area connected to the church and from eastern side there is a community area which is supposed to be used as residential premises. Roof of both these parts is constructed as flat vegetative roof. Structural design is systemic, Velox. Foundation construction combines concrete and ferro-concrete belts and footing.

碩士
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.

碩士
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.

碩士
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.

碩士
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.