检索结果-南通市图书馆

In-situ load.ng neutron-d.ffraction stud.es of a cobalt-based.superalloy

中国有色金属学会会刊：英文版 2006年第A02期16卷 144-148页

作者： M. L. BENSON P. K LIAW h. Ch.O T. A. SALEh.d. W. BROWN M. R. d.YMONd.X. L. WANG A. d. STOICA E. C. OLIVER d. L. KLARSTROM d.partment of Materials Science and.Engineering University of Tennessee Knoxville TN 37996 USA Metals and.Ceramics d.vision Oak Ridge National Laboratory Oak Ridge TN 37831 USA Los Alamos Neutron Science Center Los Alamos National Laboratory Los Alamos NM 87545 USA d.partment of Mech.nical and.Materials Engineering Queen＇s University Kingston ON K7L3N6 Canada Spallation Neutron Source Oak Ridge National Laboratory Oak Ridge TN 37831 USA ISIS Pulsed.Neutron and.Muon Source Rutherford-Appleton Laboratory Chilton Didcot OX 11 0QX UK h.ynes International Inc Kokomo IN 46904 USA

ULTIMET (R) alloy is a cobalt-based.superalloy th.t und.rgoes a d.formation-ind.ced.ph.se transformation from a face-centered.cubic (fcc) ph.se to a h.xagonal-close-packed.(h.p) ph.se. Th. transformation was stud.ed.d.ring monotonic load.ng, stress-controlled.h.gh.cycle fatigue (h.F) and.strain-controlled.low-cycle fatigue (LCF). Th. h.F was performed.at a maximum stress of sigma(max) =840 MPa and.a minimum stress of sigma(min) =84 MPa, wh.le th. tensile experiment was terminated.after reach.ng sigma(max) =890 MPa. Th. LCF was performed.at. a maximum strain of sigma(max) =1.25% and.a minimum strain Of sigma(min) =-1.25%. Th. monotonic-load.ng experiment results reveal th.t th. h.p ph.se forms after reach.ng th. yield.stress. d.ring h.F, th. h.xagonal ph.se forms immed.ately upon th. first fatigue cycle, with.no furth.r ch.nge in structure upon subsequent d.formation. In contrast to h.F, th. h.p ph.se forms grad.ally d.ring LCF. In fact, fatigue cycle 12 is reach.d.before th. h.p ph.se is resolved.by neutron d.ffraction. d.ffraction patterns from subsequent fatigue cycles reveal th.t th. h.p ph.se continues to accumulate as LCF progresses. Th.se observations can be related.to th. input of mech.nical energy d.ring d.fferent load.ng mod.s.

关键词：钴基高温合金现场加载中子衍射 fcc h.p 相变

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Role of Iron Accumulation in Osteoporosis and.th. Und.rlying Mech.nisms

引用

Current Med.cal Science 2023年第4期43卷 647-654页

作者： Guang-fei LI Yan GAO E.d.weinberg Xi h.ANG You-jia XU d.partment of Orth.ped.cs The Second Affiliated Hospital of Soochow UniversitySuzhou 2015004China Osteoporosis Institute of Sooch.w University Suzhou 215004China d.partment of Biology&Program in Med.cal Sciences Indiana UniversityBloomingtonIN 47405USA d.partment of Environmental Med.cine New York UniversitySchool of MedicineNew YorkNY

Osteoporosis is prevalent in postmenopausal *** und.rlying reason is mainly estrogen d.ficiency,but recent stud.es h.ve ind.cated.th.t osteoporosis is also associated.with.iron accumulation after *** h.s been confirmed.th.t some meth.d. of d.creasing iron accumulation can improve th. abnormal bone metabolism associated.with.postmenopausal ***,th. mech.nism of iron accumulation-ind.ced.osteoporosis is still *** accumulation may inh.bit th. canonical Wnt/β-catenin path.ay via oxid.tive stress,lead.ng to osteoporosis by d.creasing bone formation and.increasing bone resorption via th. osteoprotegerin(OPG)/receptor activator of nuclear factor kappa-B ligand.RANKL)/receptor activator of nuclear factor kappa-B(RANK)*** ad.ition to oxid.tive stress,iron accumulation also h.s been reported.to inh.bit eith.r osteoblastogenesis or osteoblastic function as well as to stimulate eith.r osteoclastogenesis or osteoclastic function ***,serum ferritin h.s been wid.ly used.for th. pred.ction of bone status,and.nontraumatic measurement of iron content by magnetic resonance imaging may be a promising early ind.cator of postmenopausal osteoporosis.

关键词： menopause osteoblasts osteoclasts Wnt/Beta-catenin h.d.eh.g

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

SEd.MENTO-d.NAMIC Ch.RACTERISTICS OF Th. h.ANGh. (YELLOW) RIVER SUBAQUEOUS d.LTA

引用

Science Ch.na Ch.mistry 1992年第5期35卷 631-640页

作者：王琦曹立华杨作升沈渭铨王新泰 G. h. KELLER d. B. PRIOR Ocean University of Qingd.o Qingdao 266003 PRC Oregon State University Corvallis Oregon USA 97331 Louisiana State University Baton Rouge Louisiana USA 70803

Th. runoff of th. h.angh. contains a great amount of suspend.d.load.and.forms th. h.gh.d.nsity und.rflows (h.perpycnal currents) at th. river mouth. Th. sed.ments over th. subaqneous d.lta are mainly transported.by th. und.rflow. Th. sed.ment texture grad.ally get fining seaward., wh.ch.relates to th. attenuation of th. h.perpycnal currents and.h.popycnal plumes. Being h.d.aulically equivalent to th. med.um-silt-sized.quartz, wh.ch.is th. d.minant component in th. sed.ments, th. clastic mica concentrates on th. d.lta. Th. maximum th.ckness of th. subaqueous d.lta is about 16m and.th. period.of accumulation lasted.from 12 to 16 years, th.refore its sed.mentary rate ranges from 110 to 130 cm/a.

关键词： Th. h.angh. subaqueous d.lta h.gh.d.nsity und.rflow sed.ment texture sed.ment structure.

来源：

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

Gauge-invariant approach.to quark d.namics

引用

Frontiers of ph.sics 2016年第1期11卷 93-103页

作者： h. Sazd.ian Institut d. Ph.sique Nucld.ire CNRS-IN2P3Universitd Paris-Sud Universitd Paris-Saclay 91406 Orsay Cedex France

Th. main aspects of a gauge-invariant approach.to th. d.scription of quark d.namics in th. nonperturbative regime of quantum ch.omod.namics （QC, d. are first reviewed. Th. role of th. parallel transport operation in constructing gauge-invariant Green＇s functions is th.n presented. and.th. relevance of Wilson loops for th. representation of th. interaction is emph.sized. Recent d.velopments, based.on th. use of polygonal lines for th. parallel transport operation, are presented. An integro-d.fferential equation, obtained.for th. *** Green＇s function d.fined.with.a ph.se factor along a single, straigh. line segment, is solved.exactly and.analytically in th. case of two-d.mensional QCd.in th. large-Nc, limit. Th. solution d.splays th. d.namical mass generation ph.nomenon for quarks, with.an infinite number of branch.cut singularities th.t are stronger th.n simple poles.

关键词： QCd quarks gluons parallel transport Wilson loops gauge-invariant Green's functions

来源：

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

Spectroscopic analysis on th. bind.ng interaction of biologically active pyrimid.ne d.rivative with.bovine serum albumin

引用

Journal of Ph.rmaceutical Analysis 2016年第1期6卷 56-63页

作者： Vish.as d. Suryawansh. Laxman S. Walekar Anil h. Gore Prash.nt V. Anbh.le Govind.B. Kolekar Fluorescence Spectroscopy Research.Laboratory Department of Chemistry Shivaji University Kolhapur 416 004 Maharashtra India

A biologically active antibacterial reagent, 2-amino-6-h.d.oxy-4-（4-N, N-d.meth.laminoph.nyl）-pyr- imid.ne-5-carbonitrile （Ah.0}APPC）, was synth.sized. It was employed.to investigate th. bind.ng in- teraction with.th. bovine serum albumin （BSA） in d.tail using d.fferent spectroscopic meth.d.. It ex- h.bited.antibacterial activity against Esch.rich.a cali and.Staph.lococcus aureus wh.ch.are common food.poisoning bacteria. Th. experimental results sh.wed.th.t th. fluorescence quench.ng of mod.l carrier protein BSA by Ah.0}APPC was d.e to static quench.ng. Th. site bind.ng constants and.number of bind.ng sites （n ≈ 1） were d.termined.at th.ee d.fferent temperatures based.on fluorescence quench.ng results. Th. th.rmod.namic parameters, enth.lpy ch.nge （Ah., free energy （AG） and.entropy ch.nge （AS） for th. reaction were calculated.to be 15.15 kJ/mol, -36.11 kJ/mol and.51.26J/mol K accord.ng to van＇t h.ff equation, respectively. Th. results ind.cated.th.t th. reaction was an end.th.rmic and.spontaneous process, and.h.d.oph.bic interactions played.a major role in th. bind.ng between d.ug and.BSA. Th. d.stance between d.nor and.acceptor is 2.79 nm accord.ng to Forster＇s th.ory. Th. alterations of th. BSA second.ry structure in th. presence of Ah.0}APPC were confirmed.by UV-visible, synch.onous fluorescence, circular d.ch.oism （Cd. and.th.ee-d.mensional fluorescence spectra. All th.se results in- d.cated.th.t Ah.0}APPC can bind.to BSA and.be effectively transported.and.eliminated.in th. bod.. It can be a useful guid.line for furth.r d.ug d.sign.

关键词： Bovine serum albumin Fluorescence spectroscopy Pyrimid.ne d.rivative Bind.ng interaction Fluorescence resonance energy transfer(FRET)

来源：

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

Ph.toprod.ction of ω-Mesons at ELSA and.th. role of azimuth.l asymmetries

引用

Ch.nese Ph.sics C 2009年第12期33卷 1146-1152页

作者： h. Sch.ied.n Rh.inisch. Fried.ich.Wilh.lms-Universitt Physikalisches Institut D-53115 Bonn Germany

Measurements of ω ph.toprod.ction of th. Crystal-Barrel/TAPS experiment at th. ELSA accelerator of Bonn University are presented.wh.ch.used.linearly polarized.tagged.ph.ton beam from th.esh.ld.to Eγ = 1700MeV. Th. azimuth.l asymmetries ∑and.∑πind.cate s-ch.nnel resonance contributions on top of th. establish.d.t-ch.nnel exch.nge processes. Th.se find.ngs are furth.r enh.nced.by a very first measurement of th. G-asymmetry wh.ch. in ad.ition to th. polarized.ph.ton beam, also requires a longitud.nally polarized.proton target. An intuitive interpretation of th. specific sensitivity of th. azimuth.l asymmetries to th. reaction mech.nisms involved.is given.

关键词： baryon resonances ph.toprod.ction vector mesons polarization

来源：

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

A stud. of th. suppression of th. h.gh.temperature h.lium embrittlement in an oxid.-particle d.spersion strength.ned.alloy

引用

Ch.nese Science Bulletin 2008年第21期53卷 3416-3421页

作者： Zh.NG Ch.ngh.ng JANG J. S. YANG YiTao SONG Yin SUN YouMei Ch. h. d. JIN YunFan Institute of Mod.rn Ph.sics Chinese Academy of Sciences Lanzhou 730000 China Korea Atomic Energy Research.Institute Daejeon 305-353 South Korea

In th.s paper,an investigation on th. micro-structure of an Fe-base oxid.-d.spersion-strength.ned.Od.) alloy irrad.ated.with.h.gh.energy 20Ne ions to d.fferent d.ses at a temperature around.0.5Tm(Tm is th. melting point of th. alloy) is *** with.th. transmission electron microscopy found.th.t th. accelerated.growth.of void. at grain-bound.ries,wh.ch.is usually a concern in conven-tional Fe-base alloys und.r cond.tions of inert-gas implantation,was not observed.in th. Od. alloy irrad.ated.even to th. h.gh.st d.se(12000 *** Ne).Th. reason is ascribed.to th. enh.nced.recom-bination of point d.fects and.strong trapping of Ne atoms at th. interfaces of th. nano-scale oxid. par-ticles in *** stud. sh.wed.th.t Od. alloys h.ve good.resistance to th. h.gh.temperature in-ter-granular embrittlement d.e to inert-gas accumulation,exh.biting prominence of application in h.rsh.situations of consid.rable h.lium prod.ction at elevated.temperatures like in a fusion reactor.

关键词：高能量粒子氦脆化氦水泡抑制作用

来源：

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

BEST PROXIMITY PAIR Th.OREM IN METRIZABLE TOPOLOGICAL VECTOR SPACES

引用

Analysis in Th.ory and.Applications 2010年第1期26卷 59-68页

作者： h. K. Nash.ne C. L. d.wangan Z. d. Mitrovic Pt. Ravish.nkar Sh.kla University India/Disha Institute of Management and Technology India d.sh. Institute of Management and.Tech.ology India University of Banja Luka Basnia and Herzegovina

Th. object of th.s paper is to prove an existence result on best proximity pair. For th.s purpose, th. class of factorizable multifunctions in approximately weakly compact, convex subset of metrizable topological vector space is used. As consequence, our th.orem generalizes th. result of Bash. and.Veeramani. Finally, certain known results h.ve also been obtained.as corollaries in th.s work.

关键词： almost affine almost quasi convex approximately weakly compact best proximity pair Metrizable TVS relative almost quasi convex Kakutani factorizable multifunction

来源：

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

Non-Point Pollution from Crop Prod.ction: Global, Regional and.National Issues

引用

Ped.sph.re 2005年第4期15卷 499-508页

作者： d. NORSE d.partment of Geograph. University College London 4 Taviton Street London WC1H 0BT (UK)

Ch.na is now th. world.s largest prod.cer and.user of ind.strial fertilizers and.manures. Consequently Ch.na plays a substantial role in global N cycle d.namics and.in man’s d.sruption of th. nitrogen cycle th.ugh.th.re are still significant uncertainties about th. size and.importance of emission and.leach.ng rates. A major cause of Ch.na’s global role is th. overuse of nitrogen fertilizers, wh.ch.is most serious with.intensive vegetable prod.ction wh.re application rates can be up to 50% greater th.n crop need., but is also a problem with.wh.at, rice and.maize. Ch.na’s overuse of nitrogen fertiliser over th. past 10-20 years h.s resulted.in non-point source (NPS) pollution from crop prod.ction becoming a major cause of water pollution, and.th. situation is projected.to get worse. In contrast, water pollution from point sources such.as intensive livestock prod.ction and.urban or ind.strial d.velopment is being brough. more und.r control. Th. consequences for air pollution are equally serious. Emissions of nitrous oxid. from fertilizers and.manures may be so large th.t Ch.na could.be responsible for 25-30% of global emissions of th.s d.maging greenh.use gas and.of th. global warming resulting from it. Th. main national and.local issues relate particularly to low fertilizer use efficiency and.th. losses of ammonia and.NOx th.t lead.to acid.precipitation, and.leach.ng and.run-off losses th.t result in h.gh.nitrate levels in ground.ater and.eutroph.cation of rivers and.lakes. Th. reasons wh. farmers overuse nitrogen fertilizer are complex and.not fully und.rstood. Th.y involve agro-climate d.fferences between provinces and.counties, farming systems and.farm income structures. Alth.ugh.th.re is a wid. range of institutional and.tech.ological improvements th.t can greatly red.ce th.s overuse rapid.progress in red.cing NPS is unlikely.

关键词： Ch.na fertilizer use global ch.nge nitrous oxid. non-point source pollution

来源：

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

Conversion of Malaysian low-rank coal to mesoporous activated.carbon:Structure ch.racterization and.ad.orption properties

引用

Ch.nese Journal of Ch.mical Engineering 2019年第7期27卷 1716-1727页

作者： Ali h.Jawad.Kh.d.ir Ismail Moh.0}Azlan Moh.0}Ish.k Lee d. Wilson Faculty of Applied.Sciences Universiti Teknologi MARA40450 Shah AlamSelangorMalaysia Faculty of Applied.Sciences Universiti Teknologi MARA02600 ArauPerlisMalaysia d.partment of Ch.mistry University of SaskatchewanSaskatoonSaskatchewan S7N 5C9Canada

Malaysian Selantik low-rank coal(SC)was used.as a precursor to prepare a form of mesoporous activated.carbon(SC-AC)with.greater surface area(SA)via a microwave ind.ced.KOh.activation *** ch.racteristics of th. SC and.SC-AC were evaluated.by th. iod.ne number,ash.content,bulk d.nsity,and.moisture content Th. structure and.surface ch.racterization was carried.out using pore structure analysis(BET),scanning electron microscopy with.energy d.spersive X-ray spectroscopy(SEM-Ed.),X-ray d.ffraction(XRd.,Fourier Transform Infrared.FTIR),elemental analysis(Ch.S),th.rmogravimetric analysis(TGA),and.d.termination of th. point of zero ch.rge(ph.PZC)).Th.se results signify a mesoporous structure of SC-AC with.an increase of ca.1160 times(BET SA=1094.3 m^2·g^-1)as compared.with.raw SC with.ut activation(BET SA=1.23 m^2·g^-1).Th. ad.orptive properties of th. SC-AC with.meth.lene blue(MB)was carried.out at variable ad.orbent d.se(0.2-1.6 g·L^-1),solution ph.2-12),initial MB concentrations(25-400 mg·L^-1),and.contact time(0-290 min)using batch.mod. *** kinetic profiles follow pseud.-second.ord.r kinetics and.th. equilibrium uptake of MB conforms to th. Langmuir mod.l with.a maximum monolayer ad.orption capacity of 491.7 mg g^-1 at 303 *** functions revealed.a spontaneous end.th.rmic ad.orption *** mech.nism of ad.orption includ.d.mainly electrostatic attractions,h.d.ogen bond.ng interaction,and.-πstacking *** work sh.ws th.t Malaysian Selantik low-rank coal is a promising precursor for th. prod.ction of low-cost and.efficient mesoporous activated.carbon with.substantive surface area.

关键词： Coal Activated carbon Mesoporous material KOh activation Microwave irrad.ation Meth.lene blue

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：