检索结果-南通市图书馆

Particuology 2022年第6期20卷 32-38页

作者： paul Git Matthias Hof.eister Robert f.Singer Carolin Körner Chair of.Materials Science and Engineering f.r Metals(WTM) Friedrich-Alexander UniversitätErlangen-Nürnberg(FAU)Martensstr.591058 ErlangenGermany

f.uidized Carbon Bed Cooling(f.BC)is an innovative investment casting process f.r directional solidif.cation of.superalloy *** takes advantage of.a f.uidized bed with a base of.small glassy carbon beads f.r cooling and other low-density particles that f.rm an insulating layer by f.oating to the bed *** so-called“Dynamic Baf.le”protects the f.uidized bed f.om the direct heat input f.om the high-temperature heating zone and provides the basis f.r an improved bed *** prerequisites f.r a stable casting process are stable f.uidization conditions where neither collapse of.the bed nor particle blow out at excessive bubble f.rmation *** work aimed to investigate the f.uidization behavior of.spherical carbon bed material in argon and air at temperatures between 20 to 350℃.Systematic studies at reduced pressures using the f.BC prototype device were perf.rmed to understand the stable f.uidization conditions at all stages of.the investment casting *** particle shape f.ctor and size distribution characterization and the measurement of.the powder’s minimum f.uidization velocity and bed voidage show that this material can be f.lly utilized as a cooling and buoyancy medium during the f.BC process.

关键词： Gas-solid f.uidization Glassy carbon Reduced pressure Increased temperature f.uidized carbon bed

An evolutionary perspective on conf.ict and compensation in physiological and f.nctional traits

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2014年第6期60卷 755-767页

作者： Jerry f. HUSAK Simon R LAILVAUX Department of.Biology University of St. Thomas 2115 Summit Avenue St Paul MN 55105 USA Department of.Biological Sciences University of New Orleans 2000 Lakeshore Drive New Orleans LA 70148 USA

Physiological and f.nctional traits, especially those related to behavior and whole-organism perf.rmance capacities, are subject to a variety of.both parallel and opposing natural and sexual selection pressures. These selection pressures show considerable interspecif.c variation, shaping contemporary behavioral and f.nctional diversity, but the f.rm and intensity of.selection on physiological and f.nctional traits can also vary intraspecif.cally. The same suites of.traits can experience quite dif.erent se- lection pressures, depending on the sex or age of.a given individual, as well as the presence and nature of.alternative reproductive strategies and tactics. These inter- and intra-locus genetic conf.icts have potentially important consequences f.r the evolutionary trajectories of.traits subject to them. Consequently, any intraspecif.c conf.icts which could displace traits f.om their selective op- tima in certain classes of.individuals relative to others are expected to result in selection f.r mechanisms to compensate f.r devia- tion f.om those optima. Such conf.icts include interlocus sexual conf.ict, intralocus sexual conf.ict, and interacting phenotypes, as well as conf.ict within a sex. In this paper, we consider the evidence f.r, and implications of. such conf.icts f.r physiological and f.nctional traits in diverse taxa, including both vertebrates and invertebrates, and evaluate the various mechanisms, ranging f.om behavioral and mechanical to energetic and genetic, enabling compensation. We also discuss how pre- and post-mating conf.icts, as well as interacting phenotypes, might af.ect the evolution of.behavior and physiological and f.nctional traits. Investigators that seek to understand the links among behavior, morphology, physiology, and f.nction should consider such conf.icts.

关键词： Sexual Conf.ict Compensation Sexual Selection Whole-organism Perf.rmance

Preserving the literary past, looking to the f.ture: the f.rst Hong Kong Literature Database

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of.Zhejiang University-Science A(Applied Physics & Engineering) 2005年第11期6卷 1341-1347页

作者： MA Leo f.H. WONG Rita LAU paul University Library System The Chinese University of Hong Kong Hong Kong ChinaUniversity Library System The Chinese University of Hong Kong Hong Kong ChinaUniversity Library System The Chinese University of Hong Kong Hong Kong China

In the last two decades of.the 20th century, there has been an increasing interest in and emphasis on the study of.the Hong Kong literature in both the academic and general public in Hong Kong. Recognizing the emergent need of.the resources on Hong Kong literature, the University Library System of.the Chinese University of.Hong Kong set up the Hong Kong Literature Database （the “Database”）, which was the f.rst Chinese literature database in the Internet in 2000. The paper will examine how the database is constructed using XML technology andometadata schema, The database also employs Unicode UTf.8 as the internal code. A mapping table f.r traditional and simplif.ed Chinese characters was created based on Unihan and is used behind the scene so that a user can either input traditional or simplif.ed Chinese characters and retrieval will give both traditional and simplif.ed Chinese characters. Currently 65% of.journals use OCR technology so that f.ll-text searching is possible. The Chinese OCR technology will be examined in greater detail. Special f.atures of.the Database such as, page-by-page browse mode, position-highlight f.r f.ll-page newspaper, linking Table-Of.Contents and book jackets f.om the Library catalogue, etc. are described. The paper will also bring out the problem of.massive downloading and compare the state-of.the-art technology and their shortcomings. This paper shows how the Hong Kong Literature Database f.cilitates f.ture collaboration and data exchange by using open standard, shareable structure and the latest technology.

关键词： Hong Kong Literature Hong Kong Literature Database XML Metadata schema Database structure UnicodeUTf.8 OCR technology

Early terrestrial and lunar anorthosites:Comparative geochemistry and evolutionary processes

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Geoscience f.ontiers 2024年第6期15卷 348-366页

作者： paul Sotiriou Ali Polat Tim Kusky Brian f.Windley School of.the Environment University of WindsorWindsorON N9B 3P4Canada GeoZentrum Nordbayern Friedrich-Alexander-UniversitätErlangen 91054BayernGermany Center f.r Global Tectonics State Key Laboratory for Geological Processes and Mineral ResourcesChina University of GeosciencesWuhanHubei ProvincePR China School of.Geography Geology and the EnvironmentUniversity of LeicesterLeicester LE17RHUK

In a paper in 1970,Brian Windley f.rst recognised that early terrestrial and lunar anorthosites both have calcic plagioclase,and low TiO_(2)and high CaO and Al_(2)O_(3)*** these similarities,the geochemistry of.early terrestrial and lunar anorthosites has not been rigorously compared and *** this end,we compiled 425 analyses f.om 212 early terrestrial anorthosite occurrences and 306 analyses f.om 16 lunar anorthosite *** was supplemented by a compilation of.plagioclase anorthite(An)contents and pyroxene Mg#f.om early terrestrial and lunar *** terrestrial anorthosites have lower whole-rock An contents but similar Mg#to lunar *** CaO contents of.lunar anorthosites are higher than those of.early terrestrial anorthosites f.r a given MgO and Al_(2)O_(3)content,early terrestrial anorthosites have higher SiO_(2)contents than lunar anorthosites at a given MgO content,and lunar anorthosites have higher Eu/Eu*anomaly ratios yet broadly similar La/Yb and Nd/Sm ratios than early terrestrial *** early terrestrial anorthosites have less f.actionated chondrite-normalised rare earth element(REE)patterns and less prominent positive Eu anomalies than lunar *** anorthosites have higher plagioclase An contents,yet a similar range of.pyroxene Mg#compared to their early terrestrial *** early terrestrial anorthosites are more f.actionated than some lunar *** interpretations imply that most early terrestrial anorthosites crystallised f.om basaltic parental magmas that were generated by high-degree partial melting of.sub-arc asthenosphere mantle wedge sources that were hydrated by slab-derived f.uids,with the remainder being associated with mid-ocean ridge and mantle plume *** of.the arc-related early terrestrial anorthosites were inf.uenced by crustal *** addition,early terrestrial anorthosites originated f.om partial melting of.the mantle at variou

关键词： Early terrestrial anorthosites Lunar anorthosites Geochemistry Mineral chemistry

Improving operating ef.iciency with emphasis on prosthetic surgery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of.Andrology 2015年第4期17卷 686-688页

作者： Neil Baum David f.Mobley paul Perito Tulane Medical School 3525 Prytania New Orleans LA USA Institute f.rAcademic MedJcine Houston TX USA Urologist Cora Gables Florida USA.Correspondence: Dr. David F Mobley (mobleyresearch@***)

Dear Editor, Physicians are looking f.r methods and techniques to become more ef.icient and more productive. Not only is ef.iciency important in the of.ice and clinical setting, but in the operating room as well. ~his article will discuss ef.iciency and productivity in the operating room and its benef.t to patients, surgeons and hospitals.

关键词： Improving ef.iciency prosthetic

Analysis of.Solvent Ef.ect on Mechanical Properties of.Poly(ether ether ketone) Using Nano-indentation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of.Chemical Physics 2018年第2期31卷 211-215,246页

作者： Tanveer Iqbal Saima Yasin Ahmad Shakeel Hamayoun Mahmood f.had Nazir paul f. Luckham Department of.Chemical Polymer ＆ Composite Materials Engineering University of Engineering ＆ Technology Lahore KSK Campus 54890 Pakistan Department of.Chemical Engineering ＆ Technology Imperial College London South Kensington 5W7 2 AZ UK

Poly（ether ether ketone）（PEEK） is a high-perf.rmance semi-crystalline thermoplastic polymer. Exposure of.the polymeric surf.ce to solvents can have a strong ef.ect like sof.ening/swelling of.polymeric network or dissolution. In this study, nano-indentation analysis was perf.rmed to study the ef.ect of.acetone on the surf.ce mechanical properties of.PEEK using dif.erent exposure time. The experiments were perf.rmed with a constant loading rate （10 nrn/s） to a maximum indentation displacernent （1000 nrn）. A 30-second hold segrnent was included at the maximum load to account f.r any creep ef.）ors f.llowed by an unloading segrnent to 80% unloading. The indentation hardness and the elastic modulus were corn- puted as a continuous f.nction of.the penetration displacernent in the continuous stif.ness mode （CSM） indentation. The experirnental data showed that the peak load decreased f.om -5.2 mN to -1.7 mN as exposure tirne in solvent environrnent increased f.om 0 to 18 days. The elastic modulus and the hardness of.PEEK samples also displayed a decreasing trend as a f.nction of.exposure tirne in the solvent environrnent. Two empirical models were used to f.t the experirnental data of.hardness as a f.nction of.exposure tirne which showed a good agreernent with the experirnental values.

关键词： Solvent Nano-indentation Poly(ether ether ketone) Modulus Hardness

Determining the role f.r uric acid in non-alcoholic steatohepatitis development and the utility of.urate metabolites in diagnosis:An opinion review

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

World Journal of.Gastroenterology 2020年第15期26卷 1683-1690页

作者： paul Brennan Kathleen Clare Jacob George John f.Dillon Department of.Molecular and Clinical Medicine University of DundeeNinewells Hospital and Medical SchoolDundee DD19SYUnited Kingdom Department of.Neurology Queen Elizabeth HospitalGlasgow G514TFUnited Kingdom

There has long been a recognised association between non-alcoholic f.tty liver disease(NAf.D)and the composite aspects of.the metabolic *** of.this association highlighted the supposed co-existence of.elevated uric acid levels in those with *** is interest in exploitation of.this as a putative diagnostic and prognostic biomarker in *** the increased economic and health burden associated with the NAf.D epidemic,improved methods of.population-based,minimally-invasive methods and biomarkers are clearly highly sought and *** this opinion review we review the proposed role of.uric acid in the pathogenesis of.NAf.D and its potential utilisation in the diagnosis and monitoring of.the disease process.

关键词： Non-alcoholic f.tty liver disease Non-alcoholic steatohepatitis Uric acid Urate Non-invasive f.brosis markers f.tty liver index

Control and protection strategy f.r MMC MTDC system under converter-side AC f.ult during converter blocking f.ilure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of.Modern Power Systems and Clean Energy 2014年第3期2卷 272-281页

作者： Puyu WANG Xiao-Ping ZHANG paul f.COVENTRY Zhou LI University of.Birmingham Birmingham B152TTUK National Grid Warwick CV346DAUK Z.LISoutheast UniversityNanjing 210096China

This paper investigates a control and protection strategy f.r a f.ur-terminal modular multilevel converter(MMC)based high-voltage direct current(HVDC)system under a converter-side AC *** on the system operating condition,a control and protection strategy against the f.ult with normal blocking of.the converter is *** practical,applications encountering such a f.ult,the MMC at the f.ult side may experience dif.erent conditions of.blocking *** blocking f.ilures may occur on:①the whole converter;②one converter arm;③one sub-module(SM)/several SMs of.one converter arm;④other *** phenomenon of.the multi-terminal HVDC(MTDC)system f.llowing the f.ult is analyzed under the f.rst three conditions with real-time simulations using the real-time digital simulator(RTDS).Based on the impact of.dif.erent conditions on the MTDC system,the necessity of.utilizing special control and protection is discussed.A special control and protection strategy is proposed f.r emergency conditions,and its ef.ectiveness is verif.ed by real-time simulation results.

关键词： Converter blocking f.ilure Converter-side AC f.ult Control and protection Modular multilevel converter(MMC) Multi-terminal high-voltage direct current(MTDC) Real-time digital simulation

Genetic Predisposition f.r Type 2 Diabetes Mellitus in a Cameroonian Population: Contribution of.rs4731702 (C/T) Polymorphism of.Krüppel-Like f.ctor 14 Gene

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of.Genetics 2021年第2期11卷 9-22页

作者： Magellan Guewo-f.keng Eugene Sobngwi barbara Atogho-Tiedeu Eric Lontchi-Yimagou Jean-paul Chedjou Jean-Claude Mbanya Wilf.ed f. Mbacham Department of.Biochemistry Faculty of Medicine and Biomedical Sciences University of Yaoundé I Yaoundé Cameroon The Biotechnology Centre University of Yaoundé I Nkolbisson Yaoundé Cameroon Department of.Internal Medicine and Specialties Faculty of Medicine and Biomedical Sciences University of Yaoundé I Yaoundé Cameroon Department of.Biochemistry Faculty of Science University of Yaoundé I Yaoundé Cameroon

Introduction: Krüppel Like f.ctor 14 (KLf.4) gene has recently been identif.ed as a master gene f.r multiple metabolic phenotypes. The aim of.the research study was to investigate the relationship between KLf.4 rs4731702 (C/T) gene polymorphism with Type 2 Diabetes Mellitus (T2DM) in a Cameroonian population. Patients and Methods: This case-control study was conducted in 85 patients with T2DM and 95 healthy normoglycemic controls. All were nonrelated, of.Cameroonian origin, and were adults aged 24 years old and above. Demographic, clinical and biological data were collected, and biochemical explorations were perf.rmed using enzymatic colorimetric methods. The genotyping of.KLf.4 rs4731702 (CT) gene polymorphism was done by the Polymerase Chain Reaction and Restriction f.agment Length Polymorphism. Results: In comparing the Cameroonian population that consisted of.85 patients with T2DM and 95 healthy controls, the minor or risk allele of.the rs4731702 (C/T) polymorphism of.the KLf.4 gene was T (63.53% diabetic patients vs. 26.32% healthy controls, OR = 4.877 and p f.rentially associated with a specif.c diabetes phenotype. Conclusion: This study has demonstrated f.r the f.rst time the relationship between the KLf.4 rs4731702 (C/T) gene polymorphism and T2DM in this Cameroonian population. This gene polymorphism could be a promising target f.r personalized medicine through the development of.clinical genetic testing.

关键词： Genetic Krüppel-Like f.ctor 14 Gene Type 2 Diabetes Mellitus Cameroon