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Published: 10 December 2022
Last updated: 28 January 2023

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1

Colchesqui, Luciane Martins de Barros. "Síntese, caracterização e dopagem do poli(sulfeto de p-fenileno)." Universidade de São Paulo, 1991. http://www.teses.usp.br/teses/disponiveis/54/54132/tde-19022015-104504/.

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Poli (sulfeto de p-fenileno) (PPS) na forma de pó foi obtido através da reação química do p-diclorobenzeno com sulfeto de sódio em N-metilpirrolidona em um sistema de aço inox especialmente construído. Após a fusão do PPS sobre uma placa de vidro em temperaturas de cerca de 300°C, as placas foram resfriadas rapidamente, resultando em amostras amorfas. A caracterização estrutural das amostras foi feita utilizando-se técnica de difração de raios-x, medida do espectro de absorção no infravermelho e Varredura diferencial Calorimétrica (DSC). A condutividade elétrica de pastilhas (PPS/PPP) em função da temperatura foi também investigada e os resultados comparados com os obtidos utilizando-se PPS comercial (Ryton). Também foram obtidos resultados para a condutividade de filmes amorfos não dopados da amostra sintetizada de PPS, assim como dopados em solução (AlCl3/ nitrometano). O decaimento da condutividade desses filmes amorfos dopados em relação ao tempo de exposição ao ar também foi analisado
Poly-p-phenylene sulfide in the form of powder, was prepared by the reaction of p-dichlorobenzene with sodium sulfide in N-methylpyrrolidone in a specially builted stainless steel system. The samples has been obtained by the melting of PPs on glass sheets in temperature of about 300°C and rapidly quenched resulting in amorphous samples. The structural characterization of the samples were investigated using infrared technique, x-ray diffraction and differential scanning calorimetry (melting point), the results were compared with Rydon (trade name of the PPS). The electrical conductivity of undoped amorphous films obtained from the synthesized sample of PPS, as well as doped in solution (AlCl3/ nitromethane). The decrease of electrical conductivity of the amorphous doped films as a function of time of exposition to air was also analyzed
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2

Teixeira, Rodrigo Fantinatti. "Interpretação do P-CMM como facilitador da melhoria de processo de software." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-01032018-104559/.

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Dificuldades e empecilhos encontrados na melhoria de processo rin rnaware são em grande parte fruto das barreiras colocadas pelas pessoas envotv.,,.., no processo. Neste trabalho o P-CMM (People Capability Maturity Model) é interpretado com a intenção de minimizar essas barreiras. Também são apresentados como duas áreas chave de processo do P-CMM, consideradas como as mais importantes para facilitar a melhoria de processo de software, Comunicação e Mentoring, podem ser implantadas em empresas de pequeno e médio porte.
Difficulties and problems found largely in the improvement of process of software come from the barriers placed by the people involved in the process. In this work P-CMM (People Capability Maturity Model) it is interpreted with the intention of minimizing those barriers. They are also presented as two key process areas of P-CMM, considered as the most ánportant to facilitate the improvement of software process, Communication and Mentoring, they can be implanted in companies of small and medium load.
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3

Soares, Juliana Coatrini. "Eletrossíntese e caracterização voltamétrica e espectroscópica de filmes de poli-p-fenileno e derivados." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-21082015-092846/.

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Este trabalho descreve a síntese eletroquímica, a caracterização eletroquímica e estrutural e as propriedades ópticas dos filmes de poli(p−fenileno) (PPP), poli−3−metiltiofeno (P3MET), polipirrol (PPI) e dos derivados poli−p−fenileno−3−metiltiofeno (CP3MET) e poli−p−fenileno−pirrol (CPPI). Nossa motivação pode ser justificada pelo fato de o PPP e dos derivados serem polímeros conjugados eletroluminescentes na região do azul e importantes candidatos a serem empregados como camadas ativas em dispositivos emissores de luz (LEDs). Os filmes foram eletroquimicamente sintetizados sobre eletrodos de óxido de estanho dopado com flúor (FTO) em um meio não−aquoso de acetonitrila e perclorato de tetrabutilamônio. A resposta eletroquímica dos filmes de PPP, P3MET, PPI, CP3MET e CPPI foi investigada por voltametria cíclica em uma solução livre de monômeros, quando se verificou a formação de filmes eletroativos e estáveis eletroquimicamente. As propriedades ópticas dos filmes foram investigadas por espectroscopia de absorção in situ no UV−VIS, uma técnica amplamente usada para se estudar a estrutura eletrônica da maioria dos polímeros. Os espectros de UV−VIS dos filmes de PPP, P3MET, PPI, CP3MET e CPPI foram obtidos a diferentes potenciais, quando se verificou a ocorrência da transição π− π∗ dos filmes em seu estado neutro e a formação de estados polarônicos e bipolarônicos dos polímeros durante a sua oxidação. A caracterização estrutural dos filmes foi investigada por espectroscopia FT−Raman e FTIR, quando se verificou que o espectro dos filmes de CP3MET e CPPI, preparados por eletrooxidação de co−monômeros, apresentavam apenas as bandas características dos filmes dos homopolímeros, P3MET e PPI
This work describes the e1ectrochemical synthesis, structural and electrochemical characterization, and the optical properties of poly(p−phenylene) (PPP), poly(3−methylthiophene) (P3MET), polypyrrole (PPI) and their derivatives poly(p−phenylene−3−methylthiophene) (CP3MET) and poly(p−phenylene−pyrrole) (CPPI) films. Our motivation cab be justified by the fact that poly(p−phenylene) (PPP) and its derivatives are conjugated polymers that emit in the blue range of energy, and they appoint as potential candidates as active layers in displays (LEDs). The films were electrochemically synthesized on fluorine−tin−oxide glass (FTO) electrodes in a nonaqueous medium contend acetonitrile and TBAClO4. The electrochemical response of the PPP, P3MET, PPI, CP3MET and CPPI films were investigated by cyc1ic voltammetry in a monomer−free solution with the films showing a typical electroactive response. Their optical properties were investigated by in situ UV−VIS absorption spectroscopy, a technique widely used aiming at understanding the electronic structure of most polymers. The UV−VIS spectra of the PPP, P3MET, PPI, CP3MET and CPPI films were obtained at different p−doping states, i.e., at different applied potential allowing us to calculate the π− π∗ transition of the films at their neutral, and polaronic and bipolaronic states. The structural characterization of the films was investigated by FT−Raman and FTIR spectroscopy, where it was verified that the films prepared by the electrooxidation of co−monomers showed only the bands that were typical of those ones observed in the spectra of the homopolymers, P3MET and PPI.
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4

HALL, THOMAS A. "ARCHAEAL RIBONUCLEASE P HAS MULTIPLE PROTEIN SUBUNITSHOMOLOGOUS TO EUKARYOTIC NUCLEAR RIBONUCLEASE P SUBUNITS." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010508-123921.

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     RNase P removes the 5´ leader from all transfer RNA precursors, and is thus a required factor for protein synthesis. RNase P consists of a catalytic RNA molecule and associated protein, the amount of which varies among phylogenetic domains. The ca. 120 kDa RNA component of RNase P from Bacteria is catalytic

     Previous characterizations of archaeal RNase P have presented conflicting and somewhat confusing results. RNase P from

     

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5

Gantt, John Arthur. "Comparative Analysis of RNase P." NCSU, 2003. http://www.lib.ncsu.edu/theses/available/etd-09012003-153904/.

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This Master?s Thesis contains a description of the results of two research projects that were worked on over the course of two years. The first was an attempt to heterologously reconstitute the Bacillus subtilis RNase P RNA with the RNase P protein subunits of Methanothermobacter thermoautotrophicus, to identify a functional homology between one or more of the archaeal proteins with the Bacillus subtilis RNase P protein. Unfortunately, the reconstitution experiment could not be completed due to the poor quality of the pre-tRNAasp substrate synthesized. The second project dealt with comparative analysis of bacterial RNase P RNA. Eleven new RNase P RNA genes were amplified, sequenced, and their secondary structures derived by comparative analysis.
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6

Oliveira, José Roberto Temponi de. "Uso do Amostrador de Gibbs e Metropolis-Hastings em Análise Bayesiana de Modelos AR(p)." Universidade de São Paulo, 1998. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-15032018-141438/.

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Neste trabalho comparamos modelos de séries temporais auto-regresivos de ordem p AR(p), ajustados pela abordagem clássica e Bayesiana. Na análise clássica a identificação do modelo é feita através da função de autocorrelação (FAC) e função de autocorrelação parcial (FACP), a escolha do melhor modelo para um conjunto de dados é feita usando-se o Critério de Informação de Alcaike (MC) e o Critério de Informação Bayesiano (MC). Na análise Bayesiana consideramos três alternativas de densidades a priori para os parâmetros, aqui a escolha do melhor modelo é feita pela densidade preditiva. Primeiramente consideramos a priori não informativa de Jeffireys, onde a densidade a posteriori marginal, para os parâmetros do modelo, pode ser calculada analiticamente e mostra-se que o valor esperado dessa posteriori coincide com o estimador de máxima verossimilhança. No segundo caso, adotamos uma função densidade a priori conjugada normal-gama. Aqui, a densidade a posteriori também pode ser calculada analiticameMe, resultando em uma densidade t-Student p-dimensional, no entanto em muitas situações reais adotar priori conjugada é pouco realista. Para contornar esse problema, no terceiro caso adotamos uma densidade a priori informativa t-Student, pdimensional, para os parâmetros e uma densidade a priori gama para o inverso da variância dos resíduos. Isto resulta em uma densidade a posteriori não padronizada. Neste caso a análise a posteriori só pode ser feita usando-se algoritmos de simulação em cadeia de Markov, MCMC.
In this work we compare time series models, AR(p), using the Bayesian and classical approach. The classical approach uses the Alcaike Information Criterion (AIC) and the Bayesian Information Criterion (BIC) to choose the best fitted models for a time series record data. The estimation of the model parameters are obtained by maximinn likelihood estimation. In the Bayesian approach to time series the likelihood function is combined with the prior density of the parameters, via Bayes theorem, to produce the posterior distribution of the parameters and the predictive distribution of future observation. In this paper we use three clifferent prior density functions. First, the likelihood function is approximated by a normalgamma density over the parameter space, them combined with either a Jeffreys\' vague prior or a normal-gamma prior. The result is that the analysis is similar to that obtained by a multiple linear regression analysis. Thus, the posterior analysis is done with norrnal-gamma distribution. Thirdly the likelihood function is combined with prior t-Student distribution them the posterior and predictive analysis is made via Markov Chain Monte Cano. The results are applied to two simulated series and two stream flow series of Furnas and Itumbiara reservoirs.
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7

Grossmann, Chris Allen. "Complete Spectroscopy of 30P." NCSU, 1999. http://www.lib.ncsu.edu/theses/available/etd-19991109-164413.

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GROSSMANN, CHRIS ALLEN.Complete Spectroscopy of P.(Under the direction of Dr. Gary E. Mitchell and Dr. John F. Shriner, Jr.)

Angular distribution measurements of the P reaction were used to assign quantum numbers of levels in P.This research was performed at the High Resolution Laboratory (HRL) at Triangle Universities Nuclear Laboratory (TUNL).Resonances were measured at five different angles using a High-Purity Germanium detector. The measured angular distributions were compared to calculated angular distribution expressions for different quantum number possibilities.The angular momentum quantum numbers J and parity pi were determined by the relative goodness of these fits.By comparing the reduced matrix elements to the empirically recommended upper limits on transition strengths, the isospin quantum number T was also determined for many states.Remaining ambiguities were removed by comparison of the experimental levels with theoretical shell model calculations and experimental Si levels.The work presented here improved the assignments for approximately 65 states.With a nearly pure and complete level scheme for P between the ground state and EP spectrum were examined.The fluctuations were consistent with a result intermediate between the GOE and Poisson distributions.Within one standard deviation, quantitative measurements of the statistical fluctuations were independent of isospin and consistent with previous Al results.

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8

Marathe, Vikram. "A discrete equal-capacity p-Median problem." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-12052009-020104/.

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9

Mizoi, Marcia Fumi. "Métodos de Aproximação e Aplicação de MCMC na Estimação de Máxima Verossimilhança para Processos AR(p) e MA(q)." Universidade de São Paulo, 1998. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-15032018-164925/.

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Neste projeto, abordamos os modelos de séries temporais estacionárias do tipo AR(p) e MA(q). O interesse é obter para estes modelos as- estimativas de máxima verossimilhança exata. A diferenciação explicita da função de verossimilhança exata para se obter estas estimativas, não é recomendável por envolver operações complicadas. Assim, [Box, Jenkins e Reinsel - 1994] sugerem métodos numéricos baseados em aproximações. Em [Miller - 1995] são apresentadas expressões mais simples para as derivadas da função de verossimilhança junto com um algoritmo iterativo, no caso de modelos AR(p). O objetivo do presente projeto é propor o uso de algoritmos de simulação de Monte Carlo com Cadeia de Markov (MCMC) para o cálculo das estimativas de máxima verossimilhança. Aqui, os algoritmos utilizados foram o amostrador de Gibbs em conjunto com o algoritmo de Metropolis-Hastings. Os resultados obtidos usando MCMC são comparados com as estimativas feitas pelos métodos numéricos propostos em [Box, Jenlcins e Reinsel - 1994] e [Miller - 1995].
In this work, the autoregressive and moving average time series models are considered. The main objective here is to use Markov Chain Monte Cano (MCMC) method (Metropolis-Hastings algorithm and the Gibbs Sampler) to calculate the maximum likelihood estimates in the ordinary sense (a point in the parameter space that maximizes the likelihood). The porpoused method was applied to the simulated and real date record. The estimates obtained by MCMC method was compared with likelihood estimate by iterative numerical methods.
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10

Graulich, Jean-Sébastien. "Etude expérimentale des réactions (p,alpha) et (p,gamma) d'intérêt astrophysique en cinématique inverse. Application à la réaction 18F(p,alpha)15 O." Université catholique de Louvain, 2002. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-11072002-131639/.

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Les réactions (p, gamma) et (p, alpha) jouent un rôle déterminant lors de la combustion thermonucléaire de l'hydrogène dans les étoiles. Au cours de phénomènes violents, comme l'explosion des noyaux, ces réactions peuvent impliquer des noyaux radioactifs dans le voie d'entrée. Dans le but de mieux comprendre et de pouvoir simuler ce type d'évènement, des données fiables concernant ces réactions sont indispensables. Or l'étude expérimentale des réactions impliquant des noyaux instables requiert souvent l'utilisation de faisceaux d'ions radioactifs. De tels faisceaux sont disponibles depuis une dizaine d'années à Louvain-la-Neuve. Leur application à la mesure de sections efficaces de réactions d'intérêt astrophysique a nécessité le développement de méthodes expérimentales adaptées. Ce travail présente les conséquences de l'utilisation d'un faisceau d'ions lourds sur une cible de noyaux légers, qui est la caractéristique définissant la cinématique inverse. Un programme de simulation a été développé dans un but de reproduire la forme des spectres de produits d'une réaction donnée en tenant compte des pertes d'énergie et du straggling des ions dans la cible. L'étude de la réaction 18F(p, alpha) aux énergies de collision comprises entre 270 et 730 keV est décrite en détail. Deux résonances sont observées dans cet intervalle et leurs énergies et forces respectives sont mesurées. L'analyse de la diffusion résonante 19F(p,p)18F permet de compléter et préciser la mesure des paramètres de la résonance supérieure, et notamment de déterminer son spin. Les implications de cette mesure pour l'astrophysique sont ensuite évoquées. Enfin, un projet de séparateur de recul destiné à l'étude des réactions (p, gamma) est brièvement présenté.
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11

Andrews, Andrew J. "Characterization of the Methanococcus jannaschii RNase P holoenzyme." NCSU, 2000. http://www.lib.ncsu.edu/theses/available/etd-20000810-110103.

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The RNase P RNAs from Methanococcus and Archaeoglobus lack secondary structural features essential for the recognition of pre-tRNA. In the absence of protein, these RNase P RNAs lack catalytic activity. How the Methanococcus and Archaeoglobus RNase P holoenzymes compensate for the absent RNA structural elements is not known, but we hypothesize that it is via additional proteins. The Methanococcus jannaschii RNase P holoenzyme has been purified for structural and functional characterization. This enzyme has a buoyant density in Cs2SO4 of 1.39 g/ml and an apparent molecular weight of greater than 400kDa. The holoenzyme has a Km of 68 nM, a kcat of 37nM min-1 (similar to that of other RNase P enzymes) and tolerates a wide range of ionic conditions. Six potential protein subunits have been identified on the basis of copurification with enzymatic activity. The molecular weight of three of these bands is consistent with apparent holomologs of RNase P proteins from Methanobacterium thermoautotrophicum and Saccharomyces cerevisiae.

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12

WILLIAMS, DANIEL. "ANALYSIS OF RNase P RNA STRUCTURE AND FUNCTION." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010821-140212.

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ABSTRACTWILLIAMS, DANIEL. Analysis of RNase P Structure and Function. (Under the direction of James W. Brown.) The diversity of Archaea in municipal wastewater sludge was investigated by amplification of rRNA sequences from sludge DNA using archaeal-specific primers. The most common sequences were extreme halophiles; also found were sequence members of environmental euryarchaeal and crenarchaeal groups. Only distant relatives of Methanosarcina among the Methanomicrobiales were found.A detailed comparative analysis of archaeal RNase P RNA structure and a comparison of the resulting structural information with that of the bacterial RNA reveals that the archaeal RNase P RNAs are strikingly similar to those of Bacteria. The differences between the secondary structure models of archaeal and bacterial RNase P have largely disappeared, and even variation in the sequence and structure in the RNAs are similar in extent and type. The structure of the cruciform (P7-P11) has been reevaluated on the basis of a total of 321 bacterial and archaeal sequences, leading to a model for the structure of this region of the RNA that includes an extension to P11 that consistently organizes the cruciform and adjacent highly-conserved sequences. Archaeal and bacterial RNase P RNAs are very similar in sequence and secondary structure, but in the absence of protein, the archaeal RNAs are much less active and require extreme ionic conditions. In order to assess how readily the activity of the archaea RNA alone could be improved by point mutations in its sequence, in vitro selection was used to generate variants of the self-cleaving conjugant Methanobacterium formicicum: B. subtilus tRNAAsp (cpTP). Functional variants were generated with a broad spectrum of mutations that were predominately consistent with natural variation in this RNA. Variants generated from the selection were only comparable to wildtype in catalytic activity; more performed significantly faster at lower ionic strength. These results suggest that the archaeal RNase P RNA is globally optimized and that the protein may play larger compensatory roles in catalysis than previously thought.

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13

Nixon, Joseph Blair. "Verification of the Weathered Rock Model for P-y Curves." NCSU, 2002. http://www.lib.ncsu.edu/theses/available/etd-11132002-203833/.

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Four full-scale field lateral load tests were conducted to independently verify the Weathered Rock Model for P-y Curves published by Cho (2002). Class A performance predictions were developed and presented to North Carolina Department of Transportation officials prior to testing. Performance predictions were calculated using the Weathered Rock Model, Reese¡¯s Method for P-y Curves in Weak Rock (Reese, 1997), and the Stiff Clay Model (Reese, Cox, and Koop, 1975). Field testing was conducted on two sites in Durham County, North Carolina; both sites were located within the Durham Triassic Basin. Two fully instrumented drilled shafts were constructed at each site; the instrumentation plan allowed for the measurement of top deflections, head rotation, shaft deflection and strain with depth. Results obtained from each test shaft are compared with respective Class A performance predictions. Results of verification testing show that the Weathered Rock Model can be used to accurately model the lateral deflection behavior of drilled shafts embedded in weathered rock profiles. Distribution of the subgrade reaction evaluated from testing results is compared with that published by Cho (2002) for other types of weathered rock. The magnitude of the increase in the subgrade reaction below the point of rotation for Triassic Weathered Rock is not as significant as that realized by Cho (2002). Recommended design procedures for using the Weathered Rock Model with either rock dilatometer data or geologic data are presented.
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14

Bates, Ginger. "Characterization of the protein component of Methanococcus jannaschii RNase P." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010905-163839.

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RNase P is the ribonuclease responsible for the 5? maturation of precursor transfer RNA (pre-tRNA). In Bacteria RNase P is composed of a single 14kDa protein accompanied by a single catalytic RNA subunit that is capable of cleave pre-tRNA without the protein cofactor in vitro. The RNA subunit of archaeal RNase P resembles those found in Bacteria, however holoenzymes characterized from the Archaea indicate that the accompanying protein component is much larger than in the bacterial enzyme. Purified RNase P from the Euryarchaeon Methanococcus jannaschii possesses approximately eight protein subunits and has an RNA that is incapable of cleaving pre-tRNA alone in vitro. Four putative M. jannaschii RNase P proteins have been identified by their similarity to RNase P proteins of Methanothermobacter thermoautotrophicus. Here we confirm the presence of two of these proteins, MJ0464 and MJ1139, as well as the presence of several other hypothetical proteins (MJ0332.1, MJ0376, MJ1128, and MJ1625), two 30S ribosomal protein subunits (S6E and S8E), and a nicotinamide-nucleotide adenylyltransferase in M. jannaschii RNase P preparations. Eukaryotic RNase P holoenzymes also contain multiple protein subunits and it is thought that these "extra" proteins are required for function in the increased compartmentalization of the eukaryotic cell. Archaeal cells do not have the distinct compartmentalization seen in eukaryotic cells and it is unclear what purpose the protein subunits described here would have in vivo. One possibility is protein-substrate interactions to facilitate formation of the substrate-enzyme complex. M. jannaschii RNase P RNA lacks certain secondary structures present in E. coli RNase P RNA that have been shown in the bacterial model to interact with pre-tRNA substrate. Archaeal RNase P RNAs that possess these elements, such as that of M. thermoautotrophicus, are capable of cleaving substrate in vitro without protein, although only at very high salt concentration. M. jannaschii RNase P RNA does not have any extra secondary structural elements to compensate for the lack of substrate binding helices and it is possible that the protein component has evolved to assume these responsibilities. In order to test this hypothesis, circularly permuted transfer RNAs containing a photoagent positioned in the T loop were used in ultra-violet cross-linking reactions.

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15

Clark, Shane Cecil. "Development of P-y curves for a Well Graded Gravel." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20011203-234040.

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Research work is conducted to investigate the possibility of using laboratory model tests to simulate lateral response of drilled shafts embedded in soft weathered rock and discern their P-y curve function. Eight lateral load tests on instrumented model piles embedded in an Aggregate Base Course (ABC) medium are performed to evaluate the P-y curves. The ABC material is selected to simulate the response of soft weathered rock encountered in the field. The laboratory-evaluated P-y curves are compared to data from full-scale field tests performed in weathered rock. The two key parameters evaluated are the modulus of subgrade reaction (kho) and the ultimate lateral resistance (Pult). Using the laboratory-measured data, in comparison to measured field behavior, correlations for the subgrade modulus as a function of depth, as well as simplified approximations of Pult are developed for weathered rock materials. Results indicated that a hyperpolic P-y function seems to best represent the measured laboratory P-y curves. A comparison between laboratory and field data indicated that the ABC testing medium appears to yield kho and Pult that behave in a fashion similar to weathered rock material. Accordingly, it seems that, when appropriately mixed, that ABC can be used to model SWR encountered in the field. A distribution of kho with applied confining stress is evaluated and compared to results from procedures proposed by Reese (1997) for weathered rock and Terzaghi (1955) for stiff clay. A relationship developed for the distribution of subgrade modulus as a function of depth compared well with field data. The relationship of Pult with depth as a function of Geological Strength Index (GSI) and friction angle is also presented. All results are viewed in the context of the field measured response.

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16

Leuenberger, Georg H. W. "Electrostatic density measurements in green-state P/M parts." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-0429103-125812/.

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Thesis (Ph. D.)--Worcester Polytechnic Institute.
Keywords: green-state P/M parts; inverse algorithm; conductivity-density relationship; nondestructive testing. Includes bibliographical references (p. 142-148).
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17

Malmonge, José Antonio. "Preparação, caracterização e estudo do mecanismo de transporte de cargas em blendas do copolímero P(VDF-TrFE) com poli(o-metoxianilina)." Universidade de São Paulo, 1997. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-13022015-164740/.

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Neste trabalho foram obtidas blendas flexíveis condutoras do copolímero randômico P(VDF-TrFE) na composição molar (60-40) com POMA, dopadas com TSA. Os filmes foram estudados por medidas de condutividade elétrica, análise termogravimétrica, calorimetria diferencial de varredura, microscopia eletrônica de varredura e difração de raios-X. A condutividade elétrica alcançada foi de 10-3 S/cm para o conteúdo de aproximadamente 25% de POMA dopada com TSA. As blendas apresentaram um comportamento termicamente estável ate a temperatura de 230°C e uma morfologia fibrilar que aumenta em quantidade com o aumento do conteúdo de POMA-TSA. A estrutura cristalina e a transição de fase (de ferroelétrica para paraelétrica), do copolímero foi observada nas blendas mesmo para alto conteúdo de POMA (20%). Estudos de condutividade dc realizados em baixa temperatura, mostraram que para a blenda 90/10 dopada, o processo de condução elétrica e explicado pelo modelo de \"Variable Range Hopping\"(VHR) em três dimensões. Para o regime ac verificou-se que a condutividade obedece a relação σac≈ωS), onde o expoente s depende da temperatura, tendendo ao valor 1 a medida que à temperatura tende para 0 K. Também foram estudados filmes de PANI e POMA sintetizadas quimicamente, expostos a radiação ionizante de raios-X e caracterizados por espectroscopia de UV-visível, ressonância paramagnética eletrônica, condutividade elétrica e teste de solubilidade. Os resultados mostraram que as amostras irradiadas em vácuo ou em atmosfera de oxigênio seco, não tiveram seu espectro eletrônico mudados. No entanto para as amostras irradiadas em condições ambientes, a banda de absorção atribuída à transição excitônica foi deslocada para mais baixa energia. Essa mudança no espectro vem acompanhada com um grande aumento da condutividade elétrica. Esse resultado indica que as polianilinas podem ser dopadas por raios-X. As amostras irradiadas tornaram-se não solúveis mesmo depois de desdopada, devido à formação de ligações cruzadas. Para as amostras previamente dopadas com ácidos inorgânicos, a condutividade decresce com a dose de irradiação. Provavelmente esta diminuição da condutividade ocorre pela mudança estrutural que ocorre no polímero
In this work we have obtained flexible conductive blends of P(VDF-TrFE) (60-40) copolymer and POMA. Free-standing films were studied by conductivity measurements, thermal gravimetric analysis, differential scanning calorimetry, scanning electron microscopy and X-ray diffraction. The electrical conductivity reached was 10-3S/cm for contents of about 25% of POMA doped with TSA. The blends are thermally stable up to 230°C and showed fibrils morphology that increase in quantity with the increase of content POMA-TSA. The crystalline structure and the phase transition (ferroelectric to paraeletric), of copolymer was also observed in the blends even to high content of POMA (20%). The temperature dependence of σ dc showed that at low temperature the conduction process is governed by Variable Range Hopping (VRH) in three dimensions. The ac conductive measurement, at low temperature, showed a dependence with frequency as σac≈ωs, where the exponent s depend of temperature, converging to one as the temperature goes to zero. Also thin films of chemically synthesized PANI and POMA, were exposed to ionizing X-ray radiation and characterized by ultraviolet visible spectroscopy, electron paramagnetic resonance, electrical conductivity and solubility measurements. Samples irradiated in vacuum or dry oxygen atmosphere did not show electronic spectra variation. However, under humid atmosphere the energy of the excitonic transition was decreased and accompanied by a great conductivity increase. The results indicate that doping of polyaniline can be induced by X-ray radiation. The solubility is significantly decreased to irradiated samples, even after to be doped, due to crosslinking. In samples previously doped with inorganic acid, the conductivity decreased with irradiation dose, probably due to structural changes.
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18

Choi, Kwangbom. "P-Coffee a new divide-and-conquer method for multiple sequence alignment /." NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-01182005-060947/.

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We describe a new divide-and-conquer method, P-Coffee, for alignment of multiple sequences. P-Coffee first identifies candidate alignment columns using a position-specific substitution matrix (the T-Coffee extended library), tests those columns, and accepts only qualified ones. Accepted columns do not only constitute a final alignment solution, but also divide a given sequence set into partitions. The same procedure is recursively applied to each partition until all the alignment columns are collected. In P-Coffee, we minimized the source of bias by aligning all the sequences simultaneously without requiring any heuristic function to optmize, phylogenetic tree, nor gap cost scheme. In this research, we show the performance of our approach by comparing our results with that of T-Coffee using the 144 test sets provided in BAliBASE v1.0. P-Coffee outperformed T-Coffee in accuracy especially for more complicated test sets.
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19

Jackson, Laura Elizabeth. "The Directional p-Median Problem with Applications to Traffic Quantization and Multiprocessor Scheduling." NCSU, 2003. http://www.lib.ncsu.edu/theses/available/etd-11052003-111956/.

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An instance of a p-median problem gives n demand points. The objective is to locate p supply points in order to minimize the total distance of the demand points to their nearest supply point. P-median is polynomially solvable in one dimension but NP-hard in two or more dimensions, when either the Euclidean or the rectilinear distance measure is used. In this thesis, we treat the p-median problem under a new distance measure, the directional rectilinear distance, which requires the nearest supply point for a given demand point to lie above and to the right of it. This restriction has applications to multiprocessor scheduling of periodic tasks as well as to traffic quantization and Quality of Service scheduling in packet-switched computer networks. We show that the directional p-median problem is polynomially solvable in one dimension and give two algorithms. We prove the problem NP-hard in two or more dimensions and then present an efficient heuristic to solve it. Compared to the robust Teitz and Bart heuristic for p-median, our heuristic enjoys substantial speedup while sacrificing little in terms of solution quality, making it an ideal choice for our target applications with thousands of demand points.
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20

Margalef, Pallarès Jèssica. "Screening of modular and readily available ligand libraries for C-X (X=H, C, N and O) bond forming reactions. The use of DFT studies for catalysts optimization." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/386578.

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El creixent interès per a l’obtenció de compostos enantiomèricament purs, ha conduït a un important desenvolupament de la catàlisi asimètrica. En aquest context, aquesta tesis és centra en la síntesis de vàries famílies de lligands quirals altament modulars a partir de compostos de fàcil disponibilitat. Concretament, s'ha treballat en la síntesis de lligands fosfit-tioèter, fosfit-piridina, fosfit-triazola i lligands hidroaximida i tioamida. Tots ells tenen en comú que són sòlids, estables i per tant de fàcil manipulació. Aquests lligands s'han aplicat en la hidrogenació d’olefines funcionalitzades i no funcionalitzades catalitzada per Rh i Ir, en la reducció de cetones mitjançant transferència d’hidrogen catalitzada per Rh i Ru, en reaccions de substitució alílica catalitzada per Pd i en l'addició d'organoaluminats a aldehids catalitzada per Ni. A més a més, en alguns casos s'han realitzat estudis DFT per tal d'agilitzar el procés d'optimització dels lligands. Així doncs, s'ha aconseguit l'obtenció de diferents compostos químics quirals d'alt interès sintètic (alcohols, alcans funcionalitzats i no funcionalitzats, al·lils substituits) en grans enantioselectivitats i en el millor dels casos s'han aconseguit els productes en la seva forma enantiomèricament pura (>99% ee).
El creciente interés para la obtención de compuestos enantioméricamente puros para la obtención de compuestos enantioméricamente puros, ha conducido a un importante desarrollo de la catálisis asimétrica. En este contexto, esta tesis se centra en la síntesis de varias familias de ligandos quirales altamente modulares a partir de compuestos de fácil disponibilidad. Concretamente, se ha trabajado en la síntesis de ligandos fosfito-tioéter, fosfito-piridina, fosfito-triazoles y ligandos hidroaximida y tioamida. Todos ellos tienen en común que son sólidos, estables y por lo tanto de fácil manipulación. Estos ligandos se han aplicado en la hidrogenación de olefinas funcionalizadas y no funcionalizadas catalizada por Rh e Ir, en la reducción de cetonas mediante transferencia de hidrógeno catalizada por Rh y Ru, en reacciones de sustitución alílica catalizada por Pd y en el adición de organoaluminiatos a aldehídos catalizada por Ni. Además, en algunos casos se han realizado estudios DFT para agilizar el proceso de optimización de los ligandos. Así pues, se ha logrado la obtención de diferentes compuestos químicos quirales de alto interés sintético (ej. alcoholes, alcanos funcionalizados y no funcionalizados, alilos sustituidos) en grandes enantioselectividades y en el mejor de los casos se han conseguido los productos en su forma enantioméricamente pura (> 99% ee).
The growing interest in obtaining enantiomerically pure compounds in obtaining enantiomerically pure compounds has led to a significant development in the field of asymmetric catalysis. In this context, this thesis is focused on the synthesis of several families of highly modular chiral ligands from readily available compounds. Specifically, we worked on the synthesis of thioether-phosphite ligands, phosphite-pyridine, phosphite-triazole and hidroaximide and thioamide ligands. They all have in common that are solid, stable and therefore easy to handle. These ligands have been applied in the Rh- and Ir-catalyzed hydrogenation of functionalized and unfunctionalized olefins, in the Ru- and Rh-catalyzed asymmetric transfer hydrogenation of ketones, in Pd-catalyzed allylic substitution reactions and in the Ni-catalyzed addition of organoalumininum to aldehydes. Moreover, in some cases DFT studies have been performed to speed up the optimization of ligands. Hence, a variety of chiral chemical compounds of high synthetic interest (i. e. alcohols, functionalized and non-functionalized alkanes, substituted allyl) lhigh enantioselectivities were achieved and in some cases the products were obtained in their enantiomerically pure form(> 99% ee).
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21

Gong, Xingyi. "A comparison of NMHC oxidation mechanisms using specified gas mixtures and trace-P field data." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-11142005-045424/.

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Thesis (Ph. D.)--Earth and Atmospheric Sciences, Georgia Institute of Technology, 2006.
Davis, Douglas, Committee Chair ; Cunnold, Derek, Committee Member ; Mulholland, James, Committee Member ; Wang, Yuhang, Committee Member ; Wine, Paul, Committee Member. Vita. Includes bibliographical references.
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22

Saha, Deepak. "De-lubrication during sintering of P/M compacts : operative mechanism and process control strategy." Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-10014-233109.

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23

Belcher, Donald Dewayne. "Radical p-chains in L3(2)." [Johnson City, Tenn. : East Tennessee State University], 2001. http://etd-submit.etsu.edu/etd/theses/available/etd-0328101-161103/unrestricted/belcherd.pdf.

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24

Freitas, Irio Fernando de. "Fósforo extraído com resinas trocadoras de íons e Mehlich-1 de Latossolos, submetidos a fontes e doses de fósforo e tempos de contato." Universidade Federal de Viçosa, 2012. http://locus.ufv.br/handle/123456789/5491.

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Although numerous publications have tried to determine soil available P by different extraction methods, a number of questions remain unsolved. The objective of this study was to compare the Mehlich-1, Anion Resin, and Mixed Resin methods, to assess P availability in different soils, after application of soluble fertilizer and reactive and non-reactive phosphates, at different P rates and contact times. The laboratory experiment was conducted at room temperature (25 - 350C), at the Department of Soil Science of the Federal University of Viçosa, in randomized blocks in a [(3 × 3 × 2) +3]x 4 factorial design with four replications. Three Oxisols with different soil texture were tested: a very clayey LV,; a sandy clay loam LVA, and a sandy loam LA; with three P sources: triple superphosphate, Gafsa reactive phosphate rock, and natural phosphate from Araxá at two P rates (75 and 150 mg dm- 3), plus no treatment (0 dose) for each soil, after four phosphate - soil contact periods (15, 30, 60, and 120 days). Soil samples were collected from the 0 - 20 cm layer, sieved (2 mm), homogenized, and the physical and chemical properties analyzed. Soil acidity was corrected by raising base saturation to 60% with the application of CaCO3 and MgCO3 at a 4:1 molar ratio (LA required no correction). These samples were maintained at field moisture-capacity for 30 days. Thereafter, the soils were dried, crumbled and separated in 1-dm3 portions for the treatments. After the contact periods, the available-P concentrations in the samples were determined by the three extractors. Generally, the available P-content assessed by Mehlich-1, Mixed resin (MR), and anion resin (AR) decreased with increasing soil-P source contact time. For the three P sources, this reduction was most pronounced when using triple superphosphate, intermediate for reactive phosphate and phosphate Araxá was least sensitive to time effects. It was observed that AR extracted lower P levels from all three soils when the sources were phosphates, while MR extracted values close to Mehlich-1 in LV (clay) and LVA (medium texture) for reactive phosphate. For Araxá phosphate, much higher P values were determined by Mehlich-1 than by the resins, because of the acidity of the extractor. For triple superphosphate, both resins extracted higher P levels than Mehlich-1, due to the consumption of the extractor, especially from LV and LVA.
Apesar do grande número de publicações voltadas para a avaliação da disponibilidade de P por diferentes métodos de extração, persistem ainda muitas indagações sobre o assunto. O objetivo deste trabalho foi comparar os extratores Mehlich-1, Resina Aniônica e Resina Mista, quanto à avaliação da disponibilidade de P em diferentes solos, utilizando fertilizante solúvel e fosfatos naturais reativo e não reativo, em diferentes doses de P e tempos de contato. O experimento foi conduzido em condições de laboratório em temperatura ambiente (25 a 35 oC), nas dependências do Departamento de Solos da Universidade Federal de Viçosa, em blocos casualizados, no fatorial [(3 × 3 × 2) +3]x 4, com quatro repetições, sendo três Latossolos com diferentes constituições texturais: um LV, muito argiloso; um LVA, franco-argilo-arenoso e um LA, franco-arenoso; três fontes de P: superfosfato triplo, fosfato reativo de Gafsa; e fosfato natural de Araxá, em duas doses de P: 75 e 150 mg dm-3 , mais a dose 0 para cada solo; e em quatro tempos de contato fosfatosolo: 15, 30, 60 e 120 dias. As amostras dos solos foram coletadas na profundidade de 0 a 20 cm, passadas em peneira de 2 mm, homogeneizadas e submetidas à caracterização física e química. A acidez dos solos foi corrigida de acordo com o método da saturação por bases, elevando-a para 60 % com a aplicação de CaCO3 e MgCO3, na relação molar de 4:1, sendo que para o LA não houve necessidade de correção. Essas amostras foram mantidas por 30 dias com a umidade na capacidade de campo. Após esse período, os solos foram secos e destorroados e fracionados em porções de 1 dm3 para aplicação dos tratamentos. Foram coletadas amostras nos tempos de contato estabelecidos e determinadas as concentrações do P-disponível pelos três extratores. Verificou-se, de modo geral, redução no teor do P-disponível pelos extratores Mehlich-1, Resina Mista (RM) e Resina Aniônica (RA), com o aumento do tempo de contato das fontes de P com os solos. Considerando-se as três fontes de P, essas reduções dos teores foram mais pronunciadas quando se utilizou o superfosfato triplo, com o fosfato reativo em posição intermediária e o fosfato de Araxá o menos sensível ao efeito do tempo. Observou-se que a RA extraiu menores teores de P, nos três solos, quando as fontes foram os fosfatos naturais, ao passo que a RM aproxima-se dos valores obtidos pelo extrator Mehlich-1, no LV(argiloso) e LVA (textura média), para o fosfato reativo. Para o fosfato de Araxá, observaram-se valores de P bem mais elevados para o extrator Mehlich-1 do que para as Resinas, devido ao caráter ácido desse extrator. Para o superfosfato triplo, ambas as Resinas extraíram teores mais elevados de P do que o Mehlich-1, em decorrência do desgaste deste extrator, de modo particular no LV e LVA.
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25

Rocha, Brenda Chung da. "Idade, duração e condições P-T do metamorfismo de temperatura ultra-alta, anatexia e cristalização de fundido na nappe Socorro-Guaxupé." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/44/44143/tde-28092016-143315/.

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A Nappe Socorro-Guaxupé (NSG) representa um arco magmático neoproterozóico intensamente erodido, desenvolvido na margem ativa da Placa Paranapanema. A NSG está localizada no Orógeno Brasília Sul, que registra a colisão Ediacarana entre a Placa Paranapanema e o paleocontinente São Francisco, relacionado com a aglutinação do Gondwana Ocidental. A NSG expõe uma seção espessa (ca. 10 km) de crosta inferior, composta dominantemente por granulitos e migmatitos, e por intrusões de charnockito-granito de alto-K cálcio-alcalinos que registram um expressivo magmatismo sin-colisional. A evolução temporal dos eventos de fusão parcial, metamorfismo de temperatura ultra-alta e cristalização de fundido da NSG é acessada através de um estudo integrado envolvendo técnicas de datação in-situ de zircão e monazita, análise textural detalhada, geotermobarometria, geoquímica de elementos-traço em fases acessórias e fases metamórficas principais, geoquímica de rocha-total e isótopos de Sr-Nd em dois afloramentos-chave na região de Alfenas (MG): Pedreira Alfenas (Unidade Metatexítica) e Pedreira Santa Terezinha (Unidade Granulítica). Cinco episódios distintos de geração de monazita foram reconhecidos em migmatitos com granada ± ortopiroxênio na Unidade Metatexítica. A monazita registra idades progressivas de ca. 631±4 Ma anteriores ao evento de fusão parcial, definindo assim um limite máximo de idade para o metamorfismo de fácies granulito na NSG. Monazita relacionada com apatita registra os estágios iniciais de descompressão a ca. 628±4 Ma. O crescimento abundante de zircão e monazita registra um evento de cristalização de fundido prolongado entre ca. 630-600 Ma, com crescimento episódico em ca. 625 Ma, ca. 615 Ma e ca. 608 Ma a 790-680 °C, baseado em termometria de Ti-em-zircão. O desenvolvimento de bordas de monazita ricas em Y e ETRP em ca. 600 Ma marcam os estágios finais de cristalização de fundido, concomitante com o consumo parcial de granada e crescimento extenso de biotita ao longo da trajetória retrometamórfica. Recristalização tardia promovida pela infiltração de fluidos é registrada em bordas de monazita ricas em Th em ca. 590 Ma. Idades de cristalização ígneas dos protólitos dos granulitos félsicos e granada granulitos se situam entre ca. 730-640 Ma, e são equivalentes ao intervalo de idades obtidos em xenocristais de zircão herdados dos leucossomas das Unidades Metatexítica e Granulítica, e são interpretadas como sendo o período de magmatismo de arco pré-colisional, com duração de pelo menos 90 m.y. As idades concordia de ca. 655-650 Ma obtidas nos granulitos félsicos e granada granulitos (Unidade Granulítica) refletem o principal período de magmatismo de arco pré-colisional. As condições de pico metamórfico foram determinadas a ca. 1030 °C a 11,7 kbar em megacristais de granada e ortopiroxênio dentro de leucossoma da Unidade Metatexítica e a ca. 900 °C at 12 kbar em granada granulito da Unidade Granulítica, o que caracteriza o metamorfismo de temperatura ultra-alta sin-colisional na NSG, aqui estabelecido em ca. 630-625 Ma. Magma basáltico pode ter atuado como importante fonte de calor adicional durante o metamorfismo de temperatura ultra-alta, dada a ocorrência de rochas máficas intrusivas sin-metamórficas nas proximidades dos leucossomas charnockítico (com ortopiroxênio) e com hornblenda na Unidade Granulítica. Padrões de ETR contrastantes nestes leucossomas fornecem evidência para a presença de fundidos fracionados (maior abundância de ETR e anomalia negativa de Eu) e cumulatos (menor abundância de ETR e anomalia positiva de Eu). As rochas estudadas apresentam evidência isotópica de participação de fontes mantélicas enriquecidas em sua origem, pois retrabalhamento crustal envolvendo crostas arqueanas ou paleoproterozóicas mais antigas não foram reconhecidas até o presente momento.
The Socorro-Guaxupé Nappe (SGN) consists of a deeply eroded Neoproterozoic magmatic arc, developed at the active margin of Paranapanema Plate. The SGN is located within the southern Brasília Orogen, that records the Ediacaran collision between the Paranapanema Plate and the São Francisco paleocontinent, related to the assembly of western Gondwana. The SGN exposes a thick section (ca. 10 km) of the lower crust, mainly composed of granulites and migmatites, and by widespread high-K calc-alkaline charnockite-granite intrusions that record the syn-collisional magmatism. The timing of partial melting, ultra-high temperature (UHT) metamorphism and melt crystallization in the SGN is constrained by an integrated study involving zircon and monazite in-situ dating techniques, detailed textural analysis, geothermobarometry, trace element geochemistry in accessory phases and main metamorphic minerals, whole-rock geochemistry and Sr-Nd isotopes in two key outcrops in the Alfenas region (MG): Alfenas Quarry (Metatexite Unit) and Santa Terezinha Quarry (Granulite Unit). Five monazite growth episodes are recognized in (orthopyroxene)-garnet-bearing migmatites within the Metatexite Unit. Monazite preserves prograde growth ages of ca. 631±4 Ma prior to the partial melting event, providing an upper age limit for the granulite-facies metamorphism in the SGN. Apatite-related monazite records the initial stages of decompression at ca. 628±4 Ma. Abundant zircon and monazite growth records a protracted melt crystallization event between ca. 630-600 Ma, with episodic growth in ca. 625 Ma, ca. 615 Ma e ca. 608 Ma at 790-680 °C, based on Ti-in-zircon thermometry. The development of Y+HREE-rich monazite rims documents the final stages of melt crystallization, concomitant to retrograde garnet breakdown and extensive biotite growth along the retrograde metamorphic path. Late recrystallization promoted by fluid infiltration is recorded by Th-rich monazite rims at ca. 590 Ma. Igneous crystallization ages from protoliths of the felsic and garnet granulites range from ca. 730-640 Ma, similarly to the age range of inherited xenocrystic zircon cores from leucosomes in both Metatexite and Granulite Units, and are interpreted to constrain the pre-collisional arc magmatism lasting for at least 90 m.y. The concordia ages of ca. 655-650 Ma obtained from the felsic and garnet granulites (Granulite Unit) reflect the main period of pre-collisional arc magmatism. Peak metamorphic conditions were attained at a ca. 1030 °C a 11.7 kbar, recorded by (orthopyroxene)-garnet-bearing leucosome within the Metatexite Unit, and at ca. 900 °C, 12 kbar recorded by garnet granulites within the Granulite Unit, which characterizes the syn-collisional UHT metamorphism in the SGN, here established in ca. 630-625 Ma. Basaltic magma underplating could be a potential heat source for UHT metamorphism, given the occurrence of syn-metamorphic mafic rocks in close spatial relation to in-situ hornblende- and orthopyroxene-bearing leucosomes within the Granulite Unit. Contrasting REE patterns in these leucosomes provide evidence for the presence of both fractionated melt (higher REE abundance and negative Eu anomaly) and cumulates (lower REE abundance and positive Eu anomaly). Studied samples from the Granulite Unit show isotopic evidence for enriched-mantle sources in their origin, as crustal recycling involving either Archean or Paleoproterozoic older crust have not been recognized yet.
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26

Gaboriault, Edward M. "The effects of fill-nonuniformities on the densified states of cylindrical green P/M compacts." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-0528103-105536.

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Thesis (M.S.)--Worcester Polytechnic Institute.
Keywords: powder metallurgy; density distribution; compaction modeling; compact; powder; compaction. Includes bibliographical references (p. 141-142).
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27

Hassani, Mary. "NAD(P)H:QUINONE OXIDOREDUCTASE (NQO1)-DIRECTED LAVENDAMYCIN ANTITUMOR AGENTS: STRUCTURE-BASED DESIGN, MOLECULAR MODELING AND STRUCTURE-ACTIVITY STUDIES." The University of Montana, 2007. http://etd.lib.umt.edu/theses/available/etd-09142007-140402/.

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NAD(P)H:quinone oxidoreductase 1 (NQO1) is a two-electron reductase that catalyzes an NAD(P)H-dependent activation of many quinone-based antitumor agents. NQO1, expressed at high levels in many human solid tumors, can be used as a target for enzyme-directed bioreductive antitumor drug development. We hypothesized that lavendamycins, quinolinedione antitumor antibiotics, can be activated by NQO1 in cancer cells that overexpress NQO1 to exhibit selective toxicity toward those cells. The effects of functional group changes on the metabolism of lavendamycins by recombinant human NQO1 were studied using a spectrophotometric assay. These structure-activity relationship (SAR) studies determined key structural features that were required for lavendamycin substrate specificity. Cytotoxicity toward human colon adenocarcinoma NQO1-deficient (BE) and NQO1-rich (BE-NQ) cells was also determined using colorimetric and clonogenic assays. The best lavendamycin substrates for NQO1 were also the most selectively toxic to the BE-NQ cells compared to BE cells. To facilitate structure-based design of more optimal lavendamycin substrates and NQO1-directed lavendamycin antitumor agent development, we developed a 1H69 crystal structure-based in silico model of the NQO1 active site and performed lavendamycin-docking studies. The docking was performed using the FlexX module of SYBYL software. Lavendamycin analogues were designed as NQO1 substrates utilizing our SAR and docking data as structure-based design criteria. Docking and biological studies on the analogues were performed and were consistent suggesting the in silico model of the enzyme possessed practical predictive power. Our results also suggested practicality of the design criteria resulting in the discovery of good NQO1 substrates with selective toxicity toward BE-NQ cells. The mechanisms of NQO1-mediated selective cytotoxicity of good lavendamycin substrates in BE and BE-NQ cells were also investigated including induction of oxidative stress and apoptosis. Biomarkers of oxidative stress including formation of 8-hydroxy-2'-deoxyguanosine (8-oxo-2dG), an indicator of oxidative DNA damage, and depletion of reduced glutathione (GSH) were examined using an HPLC-based method and a colorimetric assay, respectively. Induction of apoptosis was examined using a colorimetric assay. Our results revealed that oxidative stress and subsequent apoptosis induction by a good lavendamycin substrate was NQO1 dependent and that the poor substrate for NQO1 caused neither oxidative stress nor apoptosis.
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28

Burch, Charmita P. "The extent of perturbation of skin models by transdermal penetration enhancers investigated by ³¹P NMR and fluorescence spectroscopy." unrestricted, 2007. http://etd.gsu.edu/theses/available/etd-04252007-133030/.

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Thesis (Ph. D.)--Georgia State University, 2007.
Title from thesis title screen. Author's name from thesis title screen. Jerry C. Smith, committee chair; Kathryn Grant, Stuart Allison, committee members. Electronic text (148 p. : ill. (some col.)) : digital PDF file. Description based on contents viewed October 5, 2007. Includes bibliographical references (p. 124-148).
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Winslow, David M. "Fluid inclusions : evidence for a counterclockwise p-t trajectory in the Central Maine terrane of South-Central Massachusetts /." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02132009-172529/.

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Jenkins, Kristen Buch. "Application of oxygen microbubbles for in situ biodegradation of p-xylene contaminated ground water in a soil column." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-12042009-020039/.

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31

Micheli, Paola. "Assessment of available technologies for treatment of drilling cuttings considering economical and geographical conditions." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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The aim of the thesis is to outline why hydrocarbons still so important nowadays and how to manage the environmental impact in a sustainable way, in particular the management and disposal of the waste stream of drilling cuttings. The paper present the importance of the Oil and Gas sector, the petroleum generation, the Oil and Gas exploitation and production and the waste stream generated by it with a particular focus on drilling muds and drilling cuttings. An analysis among the different types drilling muds (i.e. drilling fluids) in particular on the oil-based (OBM) one has been performed because of the important environmental impact and the consequently waste management needed. Among the different possible technologies have been analyzed in detail the more reliable one according with the economical, legal and environmental constrains. The chosen technologies are Solidification/Stabilization (S/S), Composting (bio-pile technology), Thermal desorption, Cement Plant AFR (Alternative Fuels and Raw Materials and Eko/grid technology. A business plan has been implemented to understand which one between those technologies is the more suitable in some possible different scenarios where the main driver take in account are local actual economical, social and political situation, law limits, logistic and duration of the project Ten different cases have been studied, two different scenarios for each of the five chosen technologies. The two different chosen scenarios are Europe and North Africa The results presented shall be taken as an exercise the demonstrate how to approach a new business in the field of Drilling Waste Management (DWM) and calculate a DWM Company start-up costs and finance required and a basic P&L (Profit & Loss). The business plan model in the way has been implemented can be used to assess quickly the convenience of one technology with respect another for a Start Up company or can be a tool used for assessing a new investment linked to a project.
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Stanley, Lori Hillman. "Influence of Phytase and High Available Phosphorous Corn Diets on Solubility and Plant Uptake of P, Cu, and Zn in Poultry Manure and Manure-Amended Soils." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/31109.

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Poultry manure is a useful nutrient source but recently it has raised environmental concern due to possible P movement from P saturated soils to waterbodies. This study was conducted to determine the effects of using phytase and high available phosphorous corn diets on the solubility and plant uptake of P, Cu, and Zn in poultry manure and soils amended with manure. Five diet treatments were used in the study: 1) normal phytic acid corn and 0.135% inorganic P (NPA), 2) normal phytic acid corn, 600 units phytase, and 0.135% inorganic P (NPA+Phytase), 3) normal phytic acid corn and 0.345% inorganic P (NPA+P), 4) high available phosphorous corn and 0.135% inorganic P (HAP), 5) high available phosphorous corn, 600 units phytase, and 0.135% inorganic P (HAP+Phytase). The NPA+P diet and NPA+Phytase diets are most similar to the conventional and alternative phytase supplemented diets currently used commercially. Three Virginia soils (Groseclose, Cecil, Mahan) were amended with manure from the diet treatments at rates of 25 and 50 g/kg and P and Cu were extracted with 0.01 M CaCl2 and Mehlich III extractant after incubation periods of 6 and 12 months. Corn was grown in a greenhouse experiment using these same Virginia soils and sand amended with 8.96 Mg/ha poultry manure from each of the five diet treatments. Poultry manure was nonsequentially extracted for determination of P, Cu, and Zn fractions. Comparing the alternative NPA+Phytase, HAP, and HAP+Phytase treatments to the conventional NPA+P treatment on an N- (nitrogen) basis all reduced both CaCl2 and Mehlich III-soluble P concentrations (P<0.05). Comparing these same treatments on a P-basis increased P extracted with CaCl2 24, 26, and 37%, respectively, and P extracted with Mehlich III P 5, 4, and 9%, respectively (P<0.05). The alternative NPA+Phytase and HAP+Phytase treatments increased water-soluble Cu compared to the conventional NPA+P on both a N- and P-basis, while no differences were observed in Mehlich III solubility between these treatments (P<0.05). The alternative NPA+Phytase treatment did not differ in Pand Cu in corn tissue or plant uptake when compared to the NPA or NPA+P (N- or P-basis) treatments. No difference in Zn in corn tissue was observed between these treatments on a N-basis, while NPA+Phytase was higher on a P-basis. Plant uptake of Zn was higher in the NPA+Phytase treatment compared to the NPA+P treatment on both a N- and P-basis. Addition of phytase reduced P solubility from all reagents except for CaCl2 (P<0.05). Replacing the conventional NPA+P treatment for the alternative NPA+Phytase treatment resulted in higher Cu concentrations for all reagents except for K-pyrophosphate and nitric acid. This same replacement increased Zn extracted by water, CaCl2, and CaNO3, while it reduced Zn extracted by HCl, acetic acid, PbNO3, K-pyrophosphate, and NH4-oxalate in the light. The use of phytase decreased P solubility from manure amended soils when treatments are compared on an equal N-basis, and increased P solubility when compared on an equal P-basis. No effect on plant uptake of P or Cu occurredfrom the NPA+Phytase treatment.
Master of Science
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33

Lôbo, Lucas Morais. "Substância húmica e fontes de fósforo em latossolo vermelho e neossolo quartzarênico." Universidade Federal de Goiás, 2015. http://repositorio.bc.ufg.br/tede/handle/tede/6350.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
Processes of phosphorus adsorption in soil diminish the availability of this nutrient to plants. Humic and fulvic acids present in humic substances (SH) can block the phosphorus adsorption sites in the soil. Thus, this study aimed to verify the effect of adding doses of a SH, availability of P in two types of soils with different adsorption capacities. The treatments consist of four levels of SH (0, 100, 200 and 400 kg.ha-1), two phosphorus sources (Triple superphosphate – SFT and Natural Reactive phosphate – FNR), and three assessment time (7, 14 and 28 days) in two soil types (Red Latosol – LV and Quartzipsamment – NQ). The application of SH altered the availability of P in different soils. Statistical analysis of the data showed a significant difference (P<0,05) for all factors. In LV the P availability increased for both sources, with increasing SH dose up to 14 days. At 28 days the P-available decreases, with no significant difference between doses, but remains superior to treatment without addition of SH. In the NQ the P-available decreases from the addition of the doses of 200 and 400 kg ha-1 of SH up to 14 days of incubation. After 28 days with the degradation of SH values of P-available for these doses begin to increase. These results indicate that the use of SH is effective in increasing the availability of phosphorus in different soils.
Os processos de adsorção de fósforo (P) no solo diminuem a disponibilidade deste nutriente para as plantas. Os ácidos húmicos e fúlvicos presentes nas substâncias húmicas (SH) podem bloquear os sítios de adsorção de fósforo no solo. Desta forma, este estudo teve como objetivo verificar o efeito da adição de doses de SH, na disponibilidade de P em dois tipos de solos com diferentes capacidades de adsorção. Os tratamentos são constituídos de quatro doses de SH (0, 100, 200 e 400 kg ha-1), duas fontes de fósforo (Superfosfato triplo – SFT e Fosfato Natural Reativo – FNR), e três épocas de avaliações (7, 14 e 28 dias), em dois tipos de solos (Latossolo Vermelho – LV e Neossolo Quartzarênico – NQ). A aplicação de SH alterou a disponibilidade de P nos diferentes solos. A análise estatística dos dados mostrou que houve diferença significativa (P<0,05) para todos os fatores. No LV a disponibilidade de P aumentou, para ambas as fontes, com o aumento da dose de SH até aos 14 dias. Aos 28 dias o P-disponível diminui, não havendo diferença significativa entre as doses, porém permanece superior ao tratamento sem adição de SH. No NQ o P-disponível diminui a partir da adição das doses de 200 e 400 kg ha-1 de SH até aos 14 dias de incubação. Aos 28 dias com a degradação da SH os valores de P-disponível para estas doses começam a aumentar. Estes resultados indicam que a utilização de SH é eficiente no aumento da disponibilidade de P em diferentes solos.
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34

Stokely, Matthew Hughes. "Deployment, Testing and Analysis of Advanced Thermosyphon Target Systems for Production of Aqueous [18F]Fluoride via 18O(p,n)18F." NCSU, 2008. http://www.lib.ncsu.edu/theses/available/etd-03142008-132437/.

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Single phase and boiling batch water targets are the most common designs for the cyclotron production of 18F via the 18O(p,n)18F reaction. Thermosyphon targets have design and operating characteristics which enable higher power operation than conventional boiling targets of like size. Experimental thermosyphon target systems demonstrated the feasibility of high intensity irradiation via bottom pressurized operation. An effective experimental characterization platform was developed and utilized in parallel with computational modeling efforts to further improve designs. A control strategy was also developed to provide a simple and robust means of remote target operation. Clinical production systems were designed and deployed at two facilities.
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35

Seeruttun, Sumantlall. "Weed management in sugar cares critical periods of weed competition and mechanisms of interference from Paspalum paniculatum and P. urvillei /." Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-06102009-161410/.

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36

Miller, Kevin C. "Comparison of the aeroacoustics of two small-scale supersonic inlets." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-11012008-063024/.

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37

Gilstrap, Richard A. "Investigation of Ca₂₋x[subscript]rx[subscript]P₂O₇:Eu²⁺ for application to the plasma display panel." Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04082004-180151/unrestricted/gilstrap%5Frichard%5Fa%5F200312%5Fms.pdf.

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Thesis (M.S. in M.S.E.)--School of Materials Science and Engineering, Georgia Institute of Technology, 2004. Directed by Christopher J. Summers.
Includes bibliographical references (leaves 148-152).
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38

Leftwich, Kevin Ned. "Habitat models for predicting the occurrence of blotchside logperch (Percina burtoni) and tangerine darters (P. aurantiaca) in the North Fork Holston River and Little River, Virginia." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06232009-063258/.

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39

Tompkins, John Daniel. "Characterization of sympathetic ganglion sensitivity to substance P in a genetic and a non-genetic rat model of hypertension." [Johnson City, Tenn. : East Tennessee State University], 2002. http://etd-submit.etsu.edu/etd/theses/available/etd-1230102-021212/unrestricted/TompkinsJ022703f.pdf.

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40

Dufauquez, Christophe. "Production de particules chargées légères et multiplicités neutroniques associées dans les réactions p+(nat)Si et alpha+(nat)Si de 20 à 65 MeV." Université catholique de Louvain, 2005. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-06012006-114210/.

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Cette dissertation présente les résultats des mesures des sections efficaces inclusives de production des particules chargées légères (protons, deutons, tritons, 3He, alpha, 6Li, 7Li et 7Be) ainsi que les multiplicités neutroniques associées, relevés lors des réactions nucléaires induites par protons et alpha sur une cible de natSi. Ces mesures ont été réalisées auprès du cyclotron CYCLONE de Louvain-la-Neuve aux énergies de 26.5, 48.5 et 62.9 MeV pour les réactions (p, (nat)Si) et de 25.4, 45.5 et 57.8 MeV pour les réactions (alpha, (nat)Si). Le système de détection, original dans sa conception, a été assuré par 15 télescopes constitués d'un assemblage de jonctions silicium et de scintillateurs inorganiques CsI assurant une couverture angulaire de 0 à 360°. Toutes les particules chargées étudiées dans ce travail ont été identifiées sur base de l'information de leurs pertes d'énergie dans les différentes jonctions et par la technique de l'analyse en forme des signaux lumineux issus des CsI. La détection des neutrons a été assurée par le multi-détecteur à neutrons DEMON constitué de 81 scintillateurs organiques liquides. Ces neutrons ont été identifiés par la technique de l'analyse en forme du signal lumineux. L'énergie des neutrons a été déduite par mesure de leur temps de vol. Les distributions angulaires des pics élastiques et inélastiques de la diffusion des protons et des alpha sur le 28Si ont été confrontées aux prédictions des modèles Optique, DWBA et Canaux Couplés, utilisant différents potentiels optiques. Une comparaison des résultats expérimentaux avec ceux déjà publiés sur des réactions similaires ou comparables a également fait l'objet de ce travail. De plus, les résultats ont été confrontés à ceux des prédictions des codes de simulation GNASH et TALYS. Une attention particulière a été portée aux prédictions du code TALYS. Enfin, ce travail fournit une très large et très complète base de nouvelles données expérimentales qui constitue un atout majeur et bénéfique aussi bien dans l'amélioration des codes théoriques de simulation de ce type de réactions que dans les prédictions des dégâts radiatifs induits par les différents rayonnements ionisants dans les semi-conducteurs, en général, et les composants électroniques, en particulier.
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41

Mendorf, Christina. "Ortsaufgelöste Charakterisierung von Entmischungsphänomenen in GaxIn1-xAsyP1-y-Halbleiter-Heteroschichten im Raster-Transmissionselektronenmikroskop - Spatial resolved characterisation of decomposition in GaxIn1-xAsyP1-y-semiconductor hetero structures by scanning transmission electron microscopy." Gerhard-Mercator-Universitaet Duisburg, 2002. http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-05222002-093828/.

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The use of the quaternary semiconductor alloy GaxIn1-xAsyP1-y for the development of new electronic, optoelectronic or high speed microwave devices is of great technological interest e.g. in telecommunication. Under certain manufacturing conditions unwanted variations in the chemical composition of these materials can occur, which can be attributed to the existence of a miscibility gap. These decomposition phenomena occur within the nanometer and subnanometer scale. Therefore it is necessary to use characterisation methods of high sensitivity and at the same time highest spatial resolution to investigate independently key parameters such as layer thickness, chemical composition or crystalline structure. The Scanning Transmission Electron Microscope (STEM) is suited for such material analyses since it combines illustrating and analytic characterisation methods together with high spatial resolution. The goal of this work was a comprehensive qualitative and quantitativ e investigation of decomposition in GaxIn1-xAsyP1-y using characterisation techniques like bright-field and Z-contrast imaging as well as electron energy loss spectroscopy (EELS) and convergent beam electron diffraction (CBED), performed in a STEM. For the first time the chemical decomposition process were quantified on the nanometer scale. The course of the decomposition and the predicted expansion of the miscibility gap could be acknowledged in the experiment. Additionally it was shown that by optimising growth parameters (e.g. pressure) of strain compensated superlattices the decomposition process could be inhibited or even stopped. At the same time for the improvement of the evaluation of high resolution Z-contrast images the maximum entropy method (MEM) was applied. Due to the use of the MEM the high resolution Z-contrast images permits the investigation of defect structures and for the first time using a STEM at 100 keV the dumb bells of GaSb was resolved in maximum entropy reconstruction
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42

Burnham, Shawn David. "Improved understanding and control of Mg-doped GaN by plasma assisted molecular beam epitaxy." Diss., Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-06122007-133821/.

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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.
Doolittle, W. Alan, Committee Chair ; Ferguson, Ian T., Committee Member ; Cressler, John D., Committee Member ; Dorsey, John F., Committee Member ; Carter, W. Brent, Committee Member.
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43

Webb, Charlotte. "Science goes South : John Millington, Frederick Barnard, and the University of Mississippi, 1848-1861 /." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07212009-040329/.

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Hart, Laura J. "Subacute immunotoxic effects of the environmental contaminants 7,12-dimethylbenzanthracene (DMBA), hexachlorocyclohexane (lindane), and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) on spleen and pronephros cellularity and morphology and functional activity of macrophages contained in these hemotopoietic organs in the cichlid fish tilapia (Oreochromis niloticus)." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-09182008-063320/.

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Rojas, Asheebo. "KIR Channels in CO2 Central Chemoreception: Analysis with a Functional Genomics Approach." unrestricted, 2007. http://etd.gsu.edu/theses/available/etd-08032007-163450/.

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Thesis (Ph. D.)--Georgia State University, 2007.
Title from file title page. Chun Jiang, committee chair; Delon Barfuss, Deborah Baro, Teryl Frey, committee members. Electronic text (226 p. : ill. (some col.)) : digital, PDF file. Description based on contents viewed Nov. 1, 2007. Includes bibliographical references (p. 210-226).
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46

Fujdiak, Radek. "Analýza a optimalizace datové komunikace pro telemetrické systémy v energetice." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-358408.

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Telemetry system, Optimisation, Sensoric networks, Smart Grid, Internet of Things, Sensors, Information security, Cryptography, Cryptography algorithms, Cryptosystem, Confidentiality, Integrity, Authentication, Data freshness, Non-Repudiation.
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47

McLean, Morgan Stuart Lance Kent. "A high resolution study of the ⁵²Cr(p,p₀) and ⁵²Cr(p,p₁) reactions." 2005. http://www.lib.ncsu.edu/theses/available/etd-04012005-054152/unrestricted/etd.pdf.

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48

Le, Thi Huong Xuan. "Nitrogen and phosphorus removal from wastewater added to sand by wheat straw addition and wheat plants." Thesis, 2019. http://hdl.handle.net/2440/124604.

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Wastewater irrigation can add nutrients to soils, but also increase nutrient leaching, particularly in sandy soils. For sustainable use of wastewater, nutrient leaching should be minimized. It is unclear how wheat straw amendment to sand or wheat growth on sandy soil influences removal of N and P from wastewater. This thesis aimed to investigate (1) the ability of wheat straw to remove inorganic N and P from wastewater collected from a sewage treatment plant when mixed into sand at different rates (Experiment 1) and decomposition stages of the straw (Experiment 2), and (2) the effect of wastewater irrigation at different early growth stages of wheat plants on nutrient uptake (Experiment 3). In the first experiment, wheat straw was mixed with sand at 2.5, 5, 7.5, 10, 12.5 g kg-1 in leaching columns before adding wastewater. The control was unamended sand. Leaching was conducted on 4, 8 and 16 days after wastewater addition. With straw amendment, nitrate in the sand-straw mixes was lower than in sand alone while ammonium was higher at 12.5 g straw kg- 1. Over 95 % of inorganic N from added wastewater was removed irrespective of straw rate. Straw amendment had no consistent effect on P leaching. In the second leaching column experiment, sand was mixed with wheat straw at 12.5 g straw kg-1 and incubated moist for 7 or 14 days or added just before adding wastewater (fresh straw). The control was unamended sand. Leaching was conducted 4, 8 or 16 days after wastewater addition. With straw amendment, available N in the sand-straw mixes was highest in fresh straw on day 16. Leachate inorganic N was much lower than in sand alone irrespective of straw decomposition stage. In both leaching column experiments, very little N2O was released, suggesting that denitrification was not an important process. Likely mechanisms for nutrient removal by straw are dissimilatory nitrate reduction to ammonium and nutrient binding to straw. It was concluded that mixing wheat straw into sandy soil prior to wastewater application can substantially reduce inorganic N leaching. In a pot experiment, sandy soil was left unplanted (control) or planted with wheat, which was grown for 7, 14 or 21 days before wastewater addition. All pots received reverse osmosis (RO) water for 20 days. Half of the planted pots and unplanted pots were irrigated with wastewater from day 21 to 35, the other pots still received RO until day 35. Wastewater irrigation increased N uptake compared to RO irrigation only in plants that were 21 days old before wastewater addition but had little effect on plant growth and on inorganic N and P in soil. However, presence of wheat reduced available N and P in soil compared to unplanted soils which would reduce potential of nutrient leaching after wastewater irrigation. It can be concluded that inclusion of organic amendments and/ or suitable crops are the potential options for wastewater reuse on sandy soils. Field experiments should be carried out to confirm the applicability of these effects.
Thesis (Ph.D.) -- University of Adelaide, School of Agriculture, Food and Wine, 2019
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Jaikumar, Prashant. "Differential capacity p-cycles." 2008. http://www.lib.ncsu.edu/theses/available/etd-12062008-231533/unrestricted/etd.pdf.

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"Etude expérimentale des réactions (p,alpha) et (p,gamma) d'intérêt astrophysique en cinématique inverse. Application à la réaction 18F(p,alpha)15 O." Université catholique de Louvain, 2002. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-11072002-131639/.

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