モレキュラーダイナミックスホウニヨル レナードジョーンズエキタイコンゴウブツノケンキュウ

京都大学0048新制・課程博士工学博士甲第2023号工博第535号新制||工||394(附属図書館)5299UT51-53-C166京都大学大学院工学研究科工業化学専攻(主査)教授 渡辺 信淳, 教授 功刀 雅長, 教授 羽田 宏学位規則第5条第1項該当Kyoto UniversityDA

Sobre o teorema de Campbell-Magaard e o problema de Cauchy na relatividade

After the formulation of general relativity differential geometry has become an increasing important tool in theoretical physics. This is even more clear in the investigation of the so-called embedding space-time theories. In this work we focus our attention in the Cauchy problem. These have played a crucial role in our understanding of the mathematical struc­ture of general relativity and embedding theories. We investigate the similarities and diffe­rences between the two approaches. We also study an extension of the Campbell-Magaard theorem and give two examples of both formalisms.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESA geometria diferencial passou a ser uma ferramenta fundamental na fisica com o surgi­mento da relatividade geral. Em particular, destacamos sua importância na investigado das chamadas teorias de imersdo do espaco-tempo. Neste trabalho analisamos dois grandes for­malismos fundamentados de forma direta ou indireta na teoria de imersões: o teorema de Campbell-Magaard e o problema de Cauchy para a relatividade geral. Tendo como princi­pal objetivo tracar um paralelo entre esses dois formalismos, estudamos, nesta dissertacdo, o problema de valor inicial (pvi) para a relatividade geral mostrando que alem de admitir a formulae-do de pvi, a mesma é bem posta. Ademais, aplicamos este formalismo para o caso de uma metrica do tipo Friedmann-Robertson-Walker em (3+1). Estudamos tambem o teorema de Campbell-Magaard e sua extensdo para o espaco-tempo de Einstein e aplicamos este teorema para uma metrica do tipo de Sitter em (2+1)

Meta-analysis of the clinical behavior of posterior direct resin restorations: Low polymerization shrinkage resin in comparison to methacrylate composite resin

<div><p>Polymerization shrinkage of resin composite can compromise the longevity of restorations. To minimize this problem, the monomeric composition of composites have been modified. The objective of this study was to conduct a meta-analysis to assess the clinical behavior of restorations performed with low polymerization shrinkage resin composite in comparison with traditional methacrylates-based resin composite. This systematic review was registered at Prospero data system (CRD42015023940). Studies were searched in the electronic databases PubMed, Web of Science, Scopus, Lilacs and EMBASE according to a predefined search strategy. The inclusion criteria were as follow: (1) randomized controlled clinical trials with at least six months of follow-up; (2) studies investigating composites with monomers designed to reduce polymerization shrinkage; (3) studies conducted with class I or II restorations in the permanent dentition; and (4) studies that assessed at least one of the following criteria: marginal integrity/adaptation, marginal discoloration, recurent caries, retention of composite restorations, and postoperative sensitivity. Two independent reviewers analyzed the articles to determine inclusion and risk of bias. The search conducted in the databases resulted in a total of 14,217 studies. After reviewing the references and citations, 21 articles remained. The longest clinical follow-up time was 60 months. The meta-analysis of the data in the included studies demonstrated that only one variable (marginal adaptation after 12 months) showed statistically significant outcomes, in which methacrylates-based composites presented significantly better results than resin composites containing modified monomers. The good level of the scientific evidence as well as the overall low risk of bias of the included studies indicate that composites with silorane, ormocer or bulk-fill type modified monomers have a clinical performance similar to conventional resin composites.</p></div

Summary of findings.

<p>Summary of findings.</p

Characteristics of the studies included in the systematic review.

<p>Characteristics of the studies included in the systematic review.</p

Marginal adaptation at the 12-month clinical follow-up examination.

<p>Marginal adaptation at the 12-month clinical follow-up examination.</p

Marginal discoloration at the 12-month clinical follow-up examination.

<p>Marginal discoloration at the 12-month clinical follow-up examination.</p

Retention at the 12-month clinical follow-up examination.

<p>Retention at the 12-month clinical follow-up examination.</p