Oil feed grooves are implemented in reciprocating compressor piston applications to assure a constant supply of lubricating oil on bearing surfaces and decrease friction loss. In a hermetically sealed compressor, due to small clearances encountered, oil supply becomes critical in order not to operate in boundary lubrication regime. Due to the small size of the piston and small piston &ndash / cylinder clearance, a partial lubrication regime is present. In the current study, a model that solves Reynolds&rsquo / equation for piston-cylinder lubrication and the average Reynolds&rsquo / equation that considers the effect of roughness on partially lubricated bearing for a compressor piston with oil feed grooves is developed. A parametric study is carried out to investigate the effects of piston design parameters and then arrive at an improved piston performance by using alternative designs for oil feed groove and the other design parameters.

The effects of geometry parameters of graded-index polymer optical fiber (GI-POF) components on the coupling efficiency and signal mixed proportion are studied in this thesis. Simulation and experimental approaches are used to investigate the effects of light sources on the coupling efficiency of misalighment, Y-couplers and V-groove couplers. Two different light sources are employed in this study: Laser diode (LD) and vertical-cavity surface-emitting laser (VCSEL). The optimum coupling angle and refractive index of filler in the Y-coupler are studied with a light-emitting diode (LED) light source. A good agreement between the simulation and the experiment results is shown in this work. Furthermore, two V-groove array arrangements, i.e. the parallel V-groove array and the skew V-groove array, are proposed in this study to mix multi-light-sources. The optimum parameters of V-groove are designed to achieve the highest coupling efficiency. The performances of different V-groove array arrangements have also been demonstrated for multi-signal mixing.

Thin dielectric passivation layer is one of the basic construction elements in semiconductor device technology. There are few materials, from which the layers may be manufactured. They are oxides mainly, with Si02 as the most popular of them, although, the phosphor- and boron-silicon glasses are used as passivation layers, too. In choosing a passivant of power thyristors and diodes, there are two important considerations in addition to the usual requirement for providing uniform high breakdown voltage via substrate. One consideration is the thermal stability of the passivant to subsequent high-temperature processes. The other consideration is the bias-temperature stability of the passivation layers affecting the operation life expectancy of a device. In the technology of thyristors and diodes on silicon substrates the bias-breakdown voltage is not uniform over substrate due to non-homogeneity of passivated surface of the p-n junction. In this work, passivation of moat surface by means of electrochemical etching, formation of hydrogen-rich porous silicon layers and glass in-melting steps has been investigated. Passivation quality was controlled by the measurements of surface recombination characteristics after each technological step using a non-invasive technique, which employed microwave probed photoconductivity transients (MW-PCT). It has been shown that electrochemical etching - glass melting steps involved in passivation technological procedures resulted in a decrease of... [to full text] / Puslaidininkinių prietaisų pramušimo įtampos valdymas formuojant griovelį periferiniame perimetre yra viena iš labiausiai paplitusių technologinių operacijų, gaminant galios diodus bei tiristorius Si pagrindu. Aukštavolčių didelės galios puslaidininkinių prietaisų, kurie dirba kelių tūkstančių amperų diapazone, o uždarymo įtampa iki kelių tūkstančių voltų, didelė problema elektrinio lauko pasiskirstymas ties kristalo briauna, kur p-n sandūra išeina į paviršių ir kur vyksta griūtinis krūvininkų skaičiaus didėjimas. Darbo stabilumui užtikrinti būtina pasyvuoti paviršių kristalo periferijoje, ant profiliuoto krašto. Šiame darbe išanalizuota galingų puslaidininkinių struktūrų konstrukcija, pagrindinės charakteristikos, parametrų tarpusavio ryšis, taip pat technologinis procesas ir jo ypatumai. Išanalizuotos technologinio gamybos maršruto silpniausios pozicijos. Nustatyta izoliacinių griovelių ėsdinimo charakteristikų priklausomybė nuo ėsdiklio sudėties, nuo ėsdinimo įrenginio struktūros ir nuo ėsdiklio temperatūros kitimo. Sukurta stiklo pasyvacijos difuzinės krosnies monitoringo sistema, kuri skirta aukštų temperaturų ir dujų srautų matavimui proceso metu. Rekombinacijų charakteristikų kitimo pagalba, matuojant be kontakte MW-PCT technika, įvertinama izoliacinių griovelių pasyvacijos kokybė. Technologiniame gamybos maršrute, po izoliacinio griovelio ėsdinimo operacijos, prieš stiklo pasyvaciją sudarinėjamas porėtojo silicio sluoksnis, taip pat siūloma įvesti homogeniškumo... [toliau žr. visą tekstą]

Made available in DSpace on 2014-07-29T15:29:11Z (GMT). No. of bitstreams: 1 Dissertacao Mestrado Fabio Marques de Almeida.pdf: 2048558 bytes, checksum: 5dff3bcad8868258e748980ec17d407d (MD5) Previous issue date: 2010-10-28 / Determine the epidemiological profile of in situ and invasive neoplasias of the uterus cervix in Goiânia during the period from 1988 to 2004. Methodology: The cases were identified in the Population Base Register of Cancer database of Goiânia. The studied variables were: age, histological type, extension of the disease and mortality. Analysis was done by central tendency in which the incidence rates were calculated by age, extension of the disease using Census population data and the standard population of Segi; for the mortality analysis the data were extracted from Mortality Information System. Results: We identified 4446 cases of in situ and invasive neoplasias of the uterus from the period of 1988 to 2004. Histopathology was used in 91,9% of the cases; average age was 40 years old for the in situ neoplasias and 52 years for the invasive ones (DP ± 13 and 14 years old, respectively). There were 2213 (58,28%) in situ cases, 1603 invasives (41,8%) and, in 633 cases (14,2%), it was not possible to verify their extension. The annual rate of percentage change (AAPC) for the in situ incidence was 13.08% (IC 95% 9.75 16.50; p<0.0000) per year and1.27% (IC95% -1.74 4.37; p<0.3862) for the invasive cases. The standard mortality rate was 12.2 and 8.2 per 100,000 in 1988 and 2004 respectively, with an AAPC of -3.02 (IC95% -5,36 -0,62; p<0,0172). Squamous cell carcinoma was found to be the predominant histologic type. A reduction of the Adenocarcinoma incidence in situ was not found nor was found a significant change of the Adenocarcinoma invasive; the squamous invasive cancer did present a considerable reduction of 2,85 per year. Conclusion: It was observed that the most frequent invasive tumors were the squamous cell carcinomas and Adenocarcinomas. Data did not demonstrate a rise in the diagnosis of invasive neoplasia, although there occurred an increase of diagnoses of in situ neoplasias. Mortality has demonstrated a tendency of reduction, suggesting that improvements of the tracking programs have changed the incidence or uterine cancer, though it has not yet accomplished all its objectives. Keywords: cervical cancer, uterus, epidemiology, frequency, extension, incidence, Goiânia, Brazil. / Determinar o perfil de incidência e mortalidade das mulheres portadoras de neoplasias (in situ e invasoras) do colo uterino, na Cidade de Goiânia, no período de 1988 a 2004. Metodologia: Estudo de base populacional dos casos coletados no banco de dados do Registro de Câncer de Base Populacional de Goiânia. As variáveis estudadas foram: idade, tipo histológico, extensão da doença. A análise foi feita pela tendência central, onde foram calculadas as taxas de incidência por idade e pela extensão da doença, utilizando-se a população censitária e intercensitária, coletada do Instituto Brasileiro de Geografia e Estatística, e a população padrão de Segi; e para a análise de mortalidade os dados foram extraídos do Sistema de Informação sobre Mortalidade. Resultados: Nos resultados foram identificados 4446 casos de neoplasias do colo uterino (in situ e invasoras), no período de 1988 a 2004. A base diagnóstica empregada foi a histopatológica em 91,9% dos casos e o pico de incidência para as neoplasias in situ foi de 30 anos de idade e para as invasoras de 45 anos. O número de casos in situ foi de 2213 (58,28%), de invasores 1603 (41,8%) e, em 633 casos (14,2%), não foi possível identificar a sua extensão. A taxa de mudança percentual anual (AAPC) para a incidência das neoplasias in situ foi de 13,08% (p<0,001) ao ano e de 1,27% (p=0,386) para as invasoras. A taxa padronizada de mortalidade foi de 12,2 e de 8,2/10000, em 1988 e 2004, respectivamente, e a AAPC de -3,02% (p=0,017) ao ano. Verificou-se que o carcinoma espinocelular (CEC) foi o tipo histológico predominante e que o CEC invasor e o adenocarcinoma invasor não apresentaram tendência de redução. Conclusão: Não houve redução significativa na incidência do câncer de colo uterino invasor no período analisado; entretanto, a taxa de incidência das lesões in situ aumentou significativamente no mesmo período. O adenocarcinoma e o CEC provavelmente permaneceram estáveis nos últimos 10 anos. Quanto à mortalidade foi demonstrada uma tendência de queda. Esses resultados sugerem que a melhoria dos programas de rastreamento tem modificado a evolução do câncer do colo uterino, embora nem todos os objetivos tenham sido atingidos. Unitermos: Neoplasias do colo uterino, epidemiologia, tendências, estudo de séries temporais, Goiânia, Brasil.

Na reabilitação protética, a oclusão e os movimentos mandibulares estão intrinsecamente ligados. A harmonia entre estes dois fatores torna-se indispensável para o sucesso do tratamento. Um dos conceitos sempre abordados na busca deste ideal é a relação entre os sulcos e as cúspides dos dentes com os movimentos mandibulares, onde as segundas devem passar livremente sobre os primeiros durante a movimentação mandibular. Assim, foi proposto avaliar o grau de coincidência da angulação do sulco de trabalho do primeiro molar inferior artificial, quando posicionado no arco, em relação à trajetória descrita pela cúspide mésiopalatina do primeiro molar superior em relação ao eixo de rotação vertical de lateralidade da mandíbula no articulador semi-ajustável. O autor utilizou uma metodologia que permitiu identificar esta trajetória com o auxílio de um programa de editoração gráfica. Foi possível avaliar as imagens digitais de montagens em cera de dentes artificiais em prótese totais inferiores e de seus respectivos planos de orientação posicionados em articulador. Através das imagens, localizou-se o sulco de trabalho do primeiro molar inferior, a trajetória da cúspide mésio-palatina do primeiro molar superior adotando-se o eixo de rotação vertical no centro das esferas condilares, e a perpendicular à tangente ao plano de orientação. Assim, mediu-se o ângulo formado entre a perpendicular à tangente e o sulco de trabalho e o ângulo entre a trajetória do eixo de rotação vertical e o sulco de trabalho. Os resultados mostraram que houve casos onde o sulco de trabalho coincidiu com a perpendicular à tangente do plano de orientação, nos demais casos a angulação apresentou, em média, valores baixos demonstrando que as montagens dos dentes artificiais seguiram os parâmetros adotados no plano de orientação segundo a técnica proposta. Estatisticamente, a distância intercondilar não interferiu nas médias dos ângulos entre o sulco de trabalho e a trajetória do eixo vertical de rotação. Não foi observada a coincidência entre o sulco de trabalho e a trajetória do eixo de rotação vertical, indicando que, durante a reprodução do movimento de lateralidade no articulador, ocorre interferência na excursão da cúspide mésio-palatina do primeiro molar superior. / In prosthetic rehabilitation, occlusion and mandibular movements are closely linked. Harmony between these factors is essential for treatment success. One of the main concepts approached when aiming for this goal is the relationship between teeth grooves and cuspids and mandibular movements, where cuspids must not touch grooves during these movements. Therefore, the present study proposes to evaluate the degree of coincidence of the working groove angulation from the artificial mandibular first molar, when positioned on the arch, with the trajectory traced by the mesio-palatal cuspid from the maxillary first molar during mandibular lateral translation determined by the vertical axis rotation in a semi-adjustable articulator. To identify this trajectory, the author utilized a graphical editing program. It was possible to evaluate digital images from artificial teeth mounted on wax for mandibular complete dentures, and their respective orientation planes positioned on the articulator. Through these images, the author located the working groove from the mandibular first molar, the trajectory described by the mesio-palatal cuspid from the maxillary first molar considering the vertical axis rotation at the center of the condilar spheres, and the perpendicular to the tangent of orientation plane. Thus, the angle between the perpendicular to the tangent and working groove and the angle between the trajectory of the vertical axis rotation and the working groove were measured. The results showed some cases where the working groove coincided with the perpendicular to the tangent of the orientation plane. In the remaining cases, the angulation displayed low mean values, illustrating that the mounting of artificial teeth followed the parameters adopted for the orientation plane according to the proposed technique. The distance between condoles did not significantly interfere in the mean values for the angles between the working groove and the trajectory of the vertical axis rotation. The coincidence between the working groove and the trajectory of the vertical axis rotation was not observed, indicating that, during the lateral translation movement in the articulator, there is interference in the trajectory of the maxillary first molar mesio-palatal cuspid.

Spur and groove (SaG) morphology is a common ornamentation of reef-armored Holocene carbonate platform margins. Composed of margin-normal promontories constructed of coral framestone, termed “spurs”, interleaved with similarly orientated gullies, “grooves”, this morphology varies based on a host of physical controls. Primarily, the surrounding oceanographic conditions as well as the size and shape of the platform the SaG is encompassing, directly influence the development and organization of SaG. Since grooves act as conduits for carbonate sediment transport, this study seeks to examine the relationship between SaG organization dictated by platform size and shape and how that in turn influences platform-top sedimentation. The analysis reveals trends that suggest platform shape plays a larger role than platform size in allowing highly organized SaG to develop on multiple margins around the platform. In turn, those trends would suggest these sites to have more stable platform top sediment deposits. However, many variables go in to the creation and maintenance of platform top cays. While this study enhanced the current understanding of how oceanographic conditions influence SaG development and organization, expanding on the concepts and results found in this study coupled with coring data of SaG and platform-top cays, could further link the connection between SaG and sediment transport.

Thesis Theme is a newly built hotel in Horni Mala Upa. The building is divided into hotel operations and restaurants. The building is surrounded by gently sloping terrain. The building has three floors. The building is designed from Porotherm and ceiling of reinforced concrete structures prestressed hollow core slabs Spiroll. Construction of pitched roof trusses formed with an inclination of 20 degrees.

The specific recognition of the DNA is crucial for the correct functioning of the cell. Although its mechanisms are extensively studied, the actual process is not yet fully understood, partly due to the variance observed in readout mechanisms so far. In this work, a particular type of specific recognition is examined: the shape readout in the DNA minor groove. Based on a sta- tistical analysis of three-dimensional structures of protein-DNA complexes acquired from the Protein Data Bank, I propose a previously unrecorded readout mechanism of widened minor grooves by hydrophobic amino acids. In addition, the effect of DNA sequence on the topography of the contacted locus, the preferred secondary structures and the interaction between the protein and DNA are explored, as well as the relative information amount of examined features concerning the DNA deformation. 1

京都大学 / 新制・課程博士 / 博士(理学) / 甲第25128号 / 理博第5035号 / 京都大学大学院理学研究科化学専攻 / (主査)准教授 板東 俊和, 教授 深井 周也, 教授 秋山 芳展 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DGAM

<p>The advantages of high efficiency, reliability, flexibility and high power to weight ratio make axial piston pumps popular for use in a wide variety of applications like construction and agricultural machinery, off road vehicles and aerospace applications. However, a major drawback which limits their extensive use in other commercial applications is noise. One of the important components in axial piston machines is the valve plate, which influences the transition of the suction and delivery flows into and out of the displacement chamber. Appropriate design of the valve plate can play a significant role in influencing the rate of compression and expansion in the displacement chamber, and hence contribute towards the abatement of noise in axial piston machines. Furthermore, the relief grooves in valve plates makes them relatively less sensitive to operating conditions for the operation of the pump. The high sensitivity of the valve plate design towards the pressure build up in the displacement chamber and towards the noise sources are big motivation factors towards rigorously exploring the design space to find suitable designs to meet the objective of noise reduction. This motivates the development of an advanced computational tool, colloquially called 'MiNoS', where a powerful optimization algorithm has been combined together with a novel parametrization scheme for valve plate design and a 1D simulation model of swash plate type axial piston machines to find optimized designs which can contribute towards noise reduction in swash plate type axial piston machines. Furthermore, incorporation of the appropriate constraint also helps in avoiding designs susceptible to the onset of cavitation in the displacement chamber. A case study performed using the developed computational tool has been shown later in this work.</p>