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Surface roughness of zirconia for full-contour crowns after clinically simulated grinding and polishing

International Journal of Oral Science 2014年第4期6卷 241-246页

作者： Rim Hmaidouch Wolf-dieter mller Hans-Christoph Lauer Paul Weigl Department of Prosthodontics and Geriatric Dentistry Faculty of Oral and Dental Medicine at Johann Wolfgang Goethe-University Department of Prosthodontics and Geriatric Dentistry University of Medicine Charite Department of Postgraduate Education Faculty of Oral and Dental Medicine at Johann Wolfgang Goethe-University

The aim of this study was to evaluate the effect of controlled intraoral grinding and polishing on the roughness of full-contour zirconia compared to classical veneered zirconia. Thirty bar-shaped zirconia specimens were fabricated and divided into two groups（n515）. Fifteen specimens（group 1） were glazed and 15 specimens（group 2） were veneered with feldspathic ceramic and then glazed. Prior to grinding,maximum roughness depth（Rmax） values were measured using a profilometer, 5 times per specimen. Simulated clinical grinding and polishing were performed on the specimens under water coolant for 15 s and 2 N pressure. For grinding, NTI diamonds burs with grain sizes of 20 mm, 10 mm, and 7.5 mm were used sequentially. The ground surfaces were polished using NTI kits with coarse, medium and fine polishers. After each step, Rmaxvalues were determined. Differences between groups were examined using one-way analysis of variance（ANOVA）. The roughness of group 1 was significantly lower than that of group 2. The roughness increased significantly after coarse grinding in both groups. The results after glazing were similar to those obtained after fine grinding for non-veneered zirconia. However, fine-ground veneered zirconia had significantly higher roughness than venerred, glazed zirconia. No significant difference was found between fine-polished and glazed zirconia, but after the fine polishing of veneered zirconia, the roughness was significantly higher than after *** can be concluded that for full-contour zirconia, fewer defects and lower roughness values resulted after grinding and polishing compared to veneered zirconia. After polishing zirconia, lower roughness values were achieved compared to glazing; more interesting was that the grinding of glazed zirconia using the NTI three-step system could deliver smooth surfaces comparable to untreated glazed zirconia surfaces.

关键词： full-contour zirconia grinding polishing roughness veneering porcelain

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Adult-to-adult right lobe living donor liver transplantation:Comparison of endoscopic retrograde cholangiography with standard T2-weighted magnetic resonance cholangiography for evaluation of donor biliary anatomy

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World Journal of Gastroenterology 2006年第36期12卷 5820-5825页

作者： Perdita Wietzke-Braun Felix Braun dieter müller Thomas Lorf Burckhardt Ringe Giuliano Ramadori Abteilung für Gastroenterologie und Endokrinologie Georg-August-Universitt Gttingen Germany Klinik für Allgemeine Chirurgie und Thorax-chirurgie Universitt Schleswig-Holstein Campus Kiel Germany Abteilung für Diagnostische Radiologie Georg-August-Universitt Gttingen Germany Klinik für Allgemeine Chirurgie Georg-August-Universitt Gttingen Germany Center for Liver Pancreas and Biliary Disease Drexel University College of Medicine Philadelphia United States

AIm: To compare the value of endoscopic retrograde cholangiography (ERC) and standard T2-weighted magnetic resonance cholangiography (mRC) in the evaluation process as adult-to-adult right lobe living donor liver transplantation (LDLTx) demands a successful outcome, and exact knowledge of the biliary tree is implicated to avoid biliary complications, ***: After starting the LDLTx program, 18 liver transplant candidates were selected for LDLTx by a stepwise evaluation process. ERC and standard T2-weighted mRC were performed to evaluate the biliary system of the donor liver. The anatomical findings of ERC and mRC mapping were compared using the Ohkubo classification. RESULTS: ERC allowed mapping of the whole biliary system in 15/15 (100%) cases, including 14/15 (93.3%) with biliary variants while routine mRC was only accurate in 2/13 (15.4%) cases. mRC was limited in depicting the biliary system proximal of the hepatic bifurcation. Postoperative biliary complications occurred in 2 donors and 8 recipients. Biliary complications were associated with Ohkubo type C, E or G in 6/8 recipients, and 2/3 recipients with biliary leak received a graft with multiple (≥2) bile ducts. CONCLUSION: Pretransplant ERC is safe and superior over standard mRC for detection of biliary variations that occur with a high frequency. However, precise knowledge of biliary variants did not reduce the incidence of postoperative biliary complications.

关键词： Living donor liver transplantation Donors biliary tree Endoscopic retrograde cholangiography magnetic resonance cholangiography

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鲁尔锌公司电锌厂浸出渣利用的经验

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中国有色冶金 1980年第6期 48-50页

作者： dieter J.mller ,余楚蓉

目前世界锌产量的70%以上是电解法产出的。由于目前锌浮选精矿含铁约为6～8%,因此产出大量浸出渣,这类浸出渣几乎毫无例外地必须堆存在价值昂贵的渣场中。近20年来电锌生产的发展基本上是按以下

关键词：浸出渣特伦鲁尔德国电锌黄铁矾法

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Implementation of the Flood Risk management Directive in Selected European Countries

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International Journal of Disaster Risk Science 2013年第3期4卷 115-125页

作者： Uwe müller Saxon State Agency for Environment Agriculture and GeologyDresdenSaxony 01109Germany

Flood events are a recurrent threat to economic developments and can jeopardize human existence. In order to reduce the flood risks in Europe on a sustainable basis, the European Union adopted the Flood Risk management Directive in 2007. The implementation of the directive in the national laws of all member states has laid the foundation for intergovernmental integrated flood risk management on an European scale. The following article is intended to compare and briefly assess the implementation process on inland waters at the technical level in selected European countries in the middle of the process. It covers the different basic structural, methodological, and data conditions for preparing the preliminary flood risk assessment, the flood hazard maps, the flood risk maps, and the flood risk management plans as a result of two EU projects. The technical differences in the various European countries need to be reduced in the next cycles of implementation of the Flood Risk management Directive.

关键词： flood inland preparing

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A NOVEL DESIGN OF COmPOSITE WATER TURBINE USING CFD

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Journal of Hydrodynamics 2012年第1期24卷 11-16页

作者： PIECHNA Janusz mller Norbert Turbomachinery Laboratory Department of Mechanical EngineeringMichigan State UniversityEast LansingUSA

This paper presents computational investigation of a novel design of composite material axial water turbine using Computational Fluid Dynamics（CFD）.Based on three-dimensional numerical flow analysis,the flow characteristics through the water turbine with nozzle,wheel and diffuser are *** extract power and torque of a composite water turbine at different rotating speeds were calculated and analyzed for a specific flow *** simulation results show that using nozzle and diffuser can increase the pressure drop across the turbine and extract more power from available water *** results provide a fundamental understanding of the composite water turbine,and this design and analysis method is used in the design process.

关键词： water turbine composite material Computational Fluid Dynamics(CFD) extracted power

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Surface morphology and impurity distribution of electron beam recrystallized silicon films on low cost substrates for solar cell absorber

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Rare metals 2006年第Z1期25卷 195-200页

作者： GROmBALL F müller J Department of mikrosystemtechnik Technische Universitt Hamburg-Harburg Hamburg 21073 Germany

A line shaped electron beam recrystallised polycrystalline silicon film on the low cost substrate was investigated for the use of the solar cell absorber. The applied EB energy density strongly influences the surface morphology of the film system. Lower EB energy density results in droplet morphology and the rougher SiO2 capping layer due to the low fluidity. With the energy increasing, the capping layer becomes smooth and continuous and less and small pinholes form in the silicon film. Tungstendisilicide (WSi2) is formed at the interface tungsten/silicon but also at the grain boundaries of the silicon. Because of the fast melting and cooling of the silicon film, the eutectic of silicon and tungstendisilicide mainly forms at the grain boundary of the primary silicon dendrites. The SEm-EDX analysis shows that there are no chlorine and hydrogen in the area surrounding a pinhole after recrystallization because of outgassing during the solidification.

关键词： polycrystalline silicon film solar cell recrystallization energy surface morphology outgassing

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Testing flexible polymer solar cells in near-space

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National Science Review 2023年第5期10卷 105-106页

作者： Peter müller-Buschbaum Department of Physics TUM School of Natural Sciencesand Heinz Maier-Leibnitz-Zentrum(MLZ)Technical University of Munich

Since the big success of the Vanguard1 mission,being the first solar-powered satellite,the use of solar cells in space developed very ***,conventional solar cell technologies for space are based on silicon and GaAs **...

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Biological consequences of global change for birds

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Integrative Zoology 2013年第2期8卷 136-144页

作者： Anders Pape mØller Department of Ecology Systematics and EvolutionUniversity Paris-SouthOrsay CedexFrance

Climate is currently changing at an unprecedented rate;so also human exploitation is rapidly changing the Earth for agriculture,forestry,fisheries and *** addition,pollution has affected even the most remote ecosystems,as has the omnipresence of humans,with consequences in particular for animals that keep a safe distance from potential predators,including human ***,all of these changes are occurring simultaneously,with increasing intensity,and further deterioration in both the short and the long-term is *** the consequences of these components of global change are relatively well studied on their own,the effects of their interactions,such as the combined effects of climate change and agriculture,or the combined effects of agriculture through nutrient leakage to freshwater and marine ecosystems and fisheries,and the effects of climate change and urbanization,are poorly ***,I provide a brief overview of the effects of climate change on phenology,diversity,abundance,interspecific interactions and population dynamics of birds.I address whether these effects of changing temperatures are direct,or indirect through effects of climate change on the phenology,distribution or abundance of food,parasites and ***,I review interactions between different components of global change.

关键词： climate change direct effects global change indirect effects interactions

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mucin and phospholipids determine viscosity of gallbladder bile in patients with gallstones

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World Journal of Gastroenterology 2001年第2期7卷 203-207页

作者： dieter Jüngst Anna Niemeyer Iris müller Benedikta Zündt Günther meyer martin Wilhelmi Reginalddel Pozo Departments of medicine II and Surgery Klinikum GrosshadernLudwig Maximilians-University MunichMunichGermany and Facultad de MedicinaUniversidad Católica de la Santísima ConcepciónConcepciónChile

AIm: An increased viscosity of gallbladder bile has been considered an important factor in the pathogenesis of gallstone disease. Besides lipids and proteins, mucin has been suggested to affect the viscosity of bile. To further clarify these issues we compared mucin, protein and the lipid componEnts of hepatic and gallbladder bile and its viscosity in patients with gallstones. mETHODS: Viscosity of bile (mPa.s) was measured using rotation viscosimetry in regard to the non Newtonian property of bile at low shear rates. RESULTS: Biliary viscosity was markedly higher in gallbladder bile of patients with cholesterol (5.00 +/- 0.60 mPa.s, mean +/- SEm, r= 28) and mixed stones (3.50 +/- 0.68 mPa.s; r= 8) compared to hepatic bile (0.92 +/- 0.06 mPa.s, r= 6). A positive correlation between mucin and viscosity was found in gallbladder biles (r = 0.65; P mounts of mucin to gallbladder bile resulted in a dose dependent non linear increase of its viscosity. A positive correlation was determined between phospholipid concentration and viscosity (r = 0.34, P markedly higher than that of hepatic bile in patients with gallstones. The concentration of mucin is the major determinant of biliary viscosity and may contribute by this mechanism to the role of mucin in the pathogenesis of gallstones.

关键词： Adult Bile Cholelithiasis Female Humans male middle Aged mucins Phospholipids Research Support, Non-U.S. Gov't Viscosity

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Use of the area of main influence to fix a relevant boundary for mining damages in Germany

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International Journal of mining Science and Technology 2018年第1期28卷 79-83页

作者： Denise müller Axel Preusse Faculty of Georesources and materials Engineering Institute for Mine Surveying Mining Subsidence Engineering and Geophysics in Mining RWTH Aachen University

In 2010, the fracking discussion in Germany caused a number of changes in German law, which came into force in *** the production of gas had to be *** the legislation amendment, the Subsidence-Area mining Regulation has been revised, *** changes expand the compensation of mining damages, especially to the extraction with drilling from the surface and underground *** the Subsidence-Area mining Regulation has been revised, the area of main influence(subsidence of 10 cm)remains to determine a relevant boundary for mining *** determination and prediction of this boundary above caverns are presented in this *** addition, further elements of ground movements and their relevance to mine damages are *** usage of the area of main influence to fix a relevant boundary for mining damages does not correspond to the relevant elements of ground movements.A limit for differences in subsidence(tilt) or horizontal changes in length should be preferred to describe the relevance of mining damages on ***, this paper outlines the meaning of using the area of main influence to fix a relevant boundary for mining damages.

关键词： Ground movements Area of main influence Boundary for mining damages Subsidence-area mining regulation Subsidence detection modeling above caverns

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