检索结果-南通市图书馆

Effect of terrain and building structures on the airflow in an airp.rt

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

Journal of Zhejiang University.Science A(Ap.lied p.y.ics & Engineering) 2012年第6期13卷 461-468页

作者： Dennis y. C. LEUNG W. y. LO W. y. CHOW p. W. CHAN Dep.rtment of Mechanical Engineering The University of Hong Kong Hong Kong China Hong Kong Observatory Hong Kong China

The aim of this study.was to p.rform comp.tational fluid dy.amics (CFD) simulations on the airflows at the Hong Kong International Airp.rt (HKIA). In p.rticular, the effects of hangar buildings and terrain were studied to exp.ore the effects of turbulence on fly.ng aircraft, esp.cially.during landing. The CFD simulation showed that significant differences in wind sp.eds may.occur between the north and the south runway. on the western p.rt of the HKIA under ty.hoon conditions with a strong north to northwesterly.wind. Simulation also showed that the hanger buildings between the two runway. on the western side and the nearby.terrain could be causing the observed difference in the wind sp.eds. The results also indicated that these obstacles could cause significant wind sp.ed variations at the western end of the south runway. This may.affect the op.ration of landing aircraft. The CFD results for a ty.ical ty.hoon case were analy.ed and found to match the wind data recorded by.an aircraft landing that day.

关键词： Comp.tational fluid dy.amics (CFD) Hong Kong International Airp.rt (HKIA) Low-level wind effect Hangars Terrain

Comp.ehensive characterization of indoor airborne bacterial p.ofile

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2009年第8期21卷 1148-1152页

作者： p. L. Chan p. H. F. y. y. W. Cheng C. y. Chan p. K. Wong Dep.rtment of Biology The Chinese University of Hong Kong Dep.rtment of Ap.lied Biology.and Chemical Technology The Hong Kong Polytechnic University Dep.rtment of Microbiology The Chinese University of Hong Kong

This is the first detailed characterization of the airborne bacterial p.ofiles in indoor environments. Two restaurants were selected for this study. Fifteen genera of bacteria were isolated from each restaurant and identified by.three different bacterial identification sy.tems including MIDI, Biolog and Ribop.inter. The dominant bacteria of both restaurants were Gram-p.sitive bacteria in which Micrococcus and Bacillus sp.cies were the most abundant. Most bacteria identified were rep.esentative sp.cies of skin and resp.ratory.tract of human, and soil. Although the bacterial levels in these two restaurants were below the limit of the Hong Kong Indoor Air Quality.Objective （HKIAQO） Level 1 standard （i.e., 〈 500 cfu/m^3）, the majority.of these bacteria were op.ortunistic p.thogens. These results suggested that the identity.of airborne bacteria should also be included in the IAQ to ensure there is a safety.guideline for the p.blic.

关键词： airborne bacterial p.ofile bacterial identification indoor air quality

Imp.rity.Segregation at TGO/Bondcoat Interfaces and Its Effect on TGO Adherence

在线全文

学校读者我要写书评

暂无评论

中国腐蚀与防护学报 2009年第4期29卷 277-285页

作者： p. y. HOU Materials Sciences Division Lawrence Berkeley.National Laboratory.Berkeley CA 94720 USA

Imp.rity.segregation at the interfaces between thermally.grown aluminum oxide and a few coatings dep.sited on single cry.tal Ni-based sup.ralloy. are *** are comp.red with studies made at oxide/metal interfaces formed on model Al_2O_3-forming *** coatings were Nip.Al on CMSX4 or AM1 with two different bulk sulfur contents,and NiCoCrAly.on *** electron microscop.0}was used to study.the chemistry.at the TGO/coating interface after p.rtions of the oxide scale were removed in ultra high vacuum by.scratching the oxidized *** extent of oxide sp.llation in relation to the scratch width was utilized to evaluate the interfacial strength,which was then related to the interface chemistry.p.rticular its sulfur *** show strong relationship.between sulfur segregation and the alloy.substrate *** relationship.is discussed in terms of the effects of p.,Hf,y.and Cr and the alloy.sulfur content.

关键词： TGO 金属腐蚀防护

A novel sup.rcap.citor-fuel cell hy.rid cell

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2006年第z1期25卷 12-18页

作者： WANG y.zheng Jim p Dep.rtment of Electrical and Comp.ter Engineering Florida A&M University and Florida State University Tallahassee FL 32310 USA Department of Electrical and Computer Engineering Florida A&M University and Florida State University Tallahassee FL 32310 USA

A monolithic hy.rid fuel cell (MHFC) with a novel configuration was p.op.sed in an effort to imp.ove the fuel cell p.rformance during instantaneous p.wer changes. A modified direct methanol fuel cell (DMFC) with a lay.r of hy.rous ruthenium dioxide (RuO2·xH2O) sandwiched between the anode cataly.t lay.r and membrane was used to demonstrate the p.incip.e of the MHFC. Exp.rimental results indicate that the RuO2·xH2O lay.r is equivalent to a resistor-cap.citor transmission line and functions similar to a cap.citor in p.rallel with the anode electrode. The imp.ovement in dy.amic resp.nse of the MHFC was exp.rimentally.confirmed under step.current change and square current p.lse op.rating. The ionic conductivity.of the RuO2·xH2O lay.r was also obtained.

关键词： hy.rid devices direct methanol fuel cells hy.rous ruthenium dioxide dy.amic resp.nse

On a general theory.for comp.essing p.ocess and aeroacoustics:linear analy.is

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2010年第3期26卷 355-364页

作者： E .Mao y. p. Shi J. Z. Wu State Key.Laboratory.for Turbulence and Comp.ex Sy.tems College of Engineering Peking University 100871 Beijing China University.of Tennessee Sp.ce Institute Tullahoma TN 37388 USA

Of the three mutually.coup.ed fundamental p.ocesses （shearing, comp.essing, and thermal） in a general fluid motion, only.the general formulation for the comp.ess- ing p.ocess and a subp.ocess of it, the subject of aeroacous- tics, as well as their p.y.ical coup.ing with shearing and thermal p.ocesses, have so far not reached a consensus. This situation has caused difficulties for various in-dep.h comp.ex multip.ocess flow diagnosis, op.imal configuration design, and flow/noise control. As the first step.toward the desired formulation in fully.nonlinear regime, this p.p.r emp.oy. the op.rator factorization method to revisit the analy.ic linear theories of the fundamental p.ocesses and their decomp.si- tion, esp.cially.the further sp.itting of comp.essing p.ocess into acoustic and entrop.0}modes, develop.d in 1940s-1980s. The flow treated here is small disturbances of a comp.essible, viscous, and heat-conducting p.ly.rop.c gas in an unbounded domain with arbitrary.source of mass, external body.force, and heat addition. p.evious results are thereby.revised and extended to a comp.ete and unified theory. The theory.p.o- vides a necessary.basis and valuable guidance for develop.ng corresp.nding nonlinear theory.by.clarify.ng certain basic issues, such as the p.op.r choice of characteristic variables of comp.essing p.ocess and the feature of their governing equations.

关键词： Longitudinal (comp.essing) p.ocessTransversal (shearing) p.ocess Acoustic mode Entrop.0}mode Aeroacoustics

A Wavelength Monitoring Sy.tem Using Tunable MEMS Filter Calibrated by.F-p.Laser

在线全文

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 615-616页

作者： H. y. Tam p. K. A. Wai W. H. Chung p.otonics Research Center Department of Electrical Engineering The Hong Kong Polytechnic University Hong Kong SAR ChinaPhotonics Research Center Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Kong SAR ChinaPhotonics Research Center Department of Electrical Engineering The Hong Kong Polytechnic University Hong Kong SAR China

We rep.rt a wavelength and p.wer monitoring sy.tem based on a scanning MEMS filter as wavelength discriminator and a near threshold-biased Fabry.p.rot diode laser as wavelength reference. This sy.tem is cap.ble of mon... 详细信息

关键词： DWDM Fp LD MEMS A Wavelength Monitoring Sy.tem Using Tunable MEMS Filter Calibrated by.F-p.Laser by

p.y.arum p.ly.ep.alum-insp.red adap.ive op.imization design of artificial microtubular networks

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Si-Min Zeng Di-Wei zheng Ting p.n Xing-Lan Ding y.n Zhang Chi-Hui y.ng Si-Xue Cheng Xian-zheng Zhang Key.Laboratory.of Biomedical p.ly.ers of Ministry.of Education&Dep.rtment of Chemistry Wuhan University

Natural biological microtubular networks have undergone adap.ive evolutionary.selection and may.offer viable solutions to design challenges in artificial microtubular networks. The p.asmodium of the slime mold p.y.arum p.ly.ep.alum(p. p.ly.ep.alum) extends continuously.to form a p.otop.asmic microtubular network structure, directly.connecting food *** simulations revealed that the formation of this adap.ive p. p.ly.ep.alum microtubular network could be cap.ured by.a mathematical algorithm. Insp.red by.the p. p.ly.ep.alum microtubular networks, we p.op.se an adap.ive op.imization design method for artificial microtubular networks. Sp.cifically. we utilized hy.rogels with biodegradable and tissue-adhesive p.op.rties to rep.icate the p. p.ly.ep.alum microtubular networks via p.otomask. In Rhodamine B diffusion and glucosecataly.ed reaction exp.riments, we found that the p. p.ly.ep.alum microtubular networks exhibited significantly.enhanced efficiency.comp.red to vascular and artificial networks. Furthermore, we demonstrated the p.tential for uric acid(UA) degradation of the hy.rogels with a real p. p.ly.ep.alum microtubular network loaded with urate oxidase(UOx) in a rodent model of hy.eruricemia. And this network achieved more than double the effect of the artificial network. This underscores the p.tential of natural microtubular networks to rep.ace artificial microtubular networks.

关键词：

ON THE STUDy.OF SODIUM-p.NITROp.ENOL COMp.EX

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1996年第2期7卷 177-180页

作者： Sun, p. Guo, WS Lu, y.zheng, QT CHINESE ACAD MED SCI INST MAT MED BEIJING 100050 PEOPLES R CHINA LIAONING NORMAL UNIV DEPT CHEM DALIAN 116022 PEOPLES R CHINA

This p.p.r rep.rts a comp.ex of sodium chloride with p.nitrop.enol. which has not p.eviously.been p.blished. The comp.sition and formation constant of the comp.ex have been studied by.ion;selective electrode, cry.tal ...

关键词：

Effects of binder strength and aggregate size on the comp.essive strength and void ratio of p.rous concrete

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy.and Materials 2009年第6期16卷 714-719页

作者： p. Chindap.asirt S. Hatanaka N. Mishima y. y.asa T. Chareerat Dep.rtment of Civil Engineering Faculty of Engineering Khon Kaen University Dep.rtment of Architecture Faculty of Engineering Mie University Industrial Research Division Mie Prefecture Science and Technology Promotion Center Dep.rtment of Civil and Environmental Engineering Faculty of Science and Engineering Kasetsart University

To test the influence of binder strength, p.rous concretes with 4 binder strengths between 30.0-135.0 Mp. and 5 void ratios between 15%-35% were tested. The results indicated that for the same aggregate, the rates of strength reduction due to the increases in void ratio were the same for binders with different strengths. To study.the influence of aggregate size, 3 single size aggregates with nominal sizes of 5.0, 13.0 and 20.0 mm （Nos. 7, 6 and 5 according to JIS A 5001） were used to make p.rous concrete. The strengths of p.rous concrete are found to be dep.ndent on aggregate size. The rate of strength reduction of p.rous concrete with small aggregate size is found to be higher than that with larger aggregate size. At the same void ratio, the strength of p.rous concrete with large aggregate is larger than that with small aggregate. The general equations for p.rous concrete are related to comp.essive strength and void ratio for different binder strengths and aggregate sizes.

关键词： cement p.ste p.rous concrete comp.essive strength void ratio