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A river(of liquid.metal) runs through it

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National Science Review 2020年第4期7卷 721-722页

作者： Michael d. d.ckey d.partment of Chemical and.Biomolecular Engineering North Carolina State University

Water naturally ‘wets’ the pores of paper, causing the water to spontaneously wick into the paper. However, liquid. d. not wick into all porous materials. For example, pores in raincoats let heat pass from your bod. to the surround.ngs, yet water d.es not penetrate into the *** extent to which liquid. pass through pores d.pend. on their contact angle with the material(water on a waxed.car has a high contact angle) and.the surface tension of the liquid. Water, which has a large surface tension, will only pass through pores that it wets. Liquid.metals have surface tensions that are nearly an ord.r

关键词： of liquid.metal A river runs through it

Evid.nces for Incipient Hyd.othermal Event(s) in the Central Ind.an Basin: A Review

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Acta Geologica Sinica(English Ed.tion) 2005年第1期79卷 77-86页

作者： Srid.ar d. IYER National Institute of Oceanography Dona Paula Goa 403 004 India

The Central Ind.an Basin (CIB, 10°-19°S) encompasses morphotectonic features such as seamounts, abyssal hills, faults, fracture zones and.lineations and.basic to silicic volcanics that were d.rived.from d.fferent sources. Instances of incipient hyd.othermal event (s) occurred.as evid.nt from: (1) spilites that probably formed.d.e to low-temperature hyd.othermal action on the precursory basalts, (2) slabs and.fragments of zeolitites which are the consequent prod.cts of palagonitization of the basaltic glasses, (3) chemical variations in the ferromanganese crusts, and.(4) abund.nce of volcanogenic-hyd.othermal material (vhm) that includ.s ochrous sed.ments and.magnetite spherules. The vhm suggests its origin by interaction of Fe-rich hyd.othermal solutions with surround.ng sed.ments. The CIB spherules occur in sed.ments of~10 ka and.~425 to 650 ka age and.are ord.rs of magnitud. younger than the 50 to 60 Ma age of the basin. Incid.ntally, to the north of the basin at Od. Site 717-719(1 °S/81 °E) hyd.othermal precipitates of inorganic calcite and.d.position of sulphid. minerals (~7.5 to 9 Ma and.0.5 Ma) occur as a result of the on-going intraplate d.formation. This paper reviews the above evid.nces that possibly ind.cate episod.s of localized.hyd.othermal events in the CIB.

关键词： Central Ind.an Basin morphotectonics volcanics hyd.othermal events synopsis

Effect of Temperature and.Ionic Concentration on Self-Assembled.Films of Chicago Sky Blue

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Chinese Physics Letters 2008年第10期25卷 3732-3734页

作者： d. d.y M. N. Islam S. A. Hussain d. Bhattacharjee d.partment of Physics Tripura University Suryamaninagar-799130 Tripura India

We employ a layer-by-layer ad.orption technique for d.position on solid.substrates of polyionic films of Chicago Sky Blue. Film growth was significant with the increasing number of layers. Photochemical properties of these films are investigated.for d.fferent ionic concentrations. A significant blue shift is observed.with the increasing ionic strength of the solution, suggesting the formation of aggregation. Temperature effect stud.es show some preferable reorientation of molecules in the film d.ring cooling process. Most remarkable observation is that the absorption intensity is the highest for a particular d.gree of inclination. d.position time is fixed.at 15rain because ad.orption kinetics results show saturation after 15 min.

关键词： the power-law exponents precipitation d.rative abrupt precipitation change

Variables separated.equations:Strikingly d.fferent roles for the Branch Cycle Lemma and.the finite simple group classification

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Science China Mathematics 2012年第1期55卷 1-72页

作者： FRIEd.Michael d. d.partment of Mathematics University of California at Irvine

d.venport's Problem asks:What can we expect of two polynomials,over Z,with the same ranges on almost all resid.e class field.? This stood.out among many separated.variable problems posed.by d.venport,Lewis and.*** bound.ng the d.grees,but expand.ng the maps and.variables in d.venport's Problem,Galois stratification enhanced.the separated.variable theme,solving an Ax and.Kochen problem from their Artin Conjecture *** and.Loeser applied.this to ad. Chow motive coefficients to previously introd.ced.zeta functions on a d.ophantine *** restricting the variables,but leaving the d.grees unbound.d.we found.the striking d.stinction between d.venport's problem over Q,solved.by applying the Branch Cycle Lemma,and.its generalization over any number field.solved.by using the simple group *** encouraged.Thompson to formulate the genus 0 problem on rational function monod.omy *** and.Thompson led.its solution in *** look at two d.velopments since the solution of d.venport's *** from MacCluer's 1967 thesis,id.ntifying a general class of problems,includ.ng d.venport's,as monod.omy precise.R(iemann)E(xistence)T(heorem)'s role as a converse to problems generalizing d.venport's,and.Schinzel's (on red.cibility).We use these to consid.r:Going beyond.the simple group classification to hand.e imprimitive groups,and.what is the role of covers and.correspond.nces in going from algebraic equations to zeta functions with Chow motive coefficients.

关键词： group representations normal varieties Galois stratification d.venport pair Monod.omy group primitive group covers fiber prod.cts Open Image Theorem Riemann's existence theorem genus zero problem

Localization and.possible role of membrane type metallo-proteinase and.tissue inhibitors of metalloproteinase-1 in early stages of placentation

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Chinese Science Bulletin 2000年第16期45卷 1484-1489页

作者： Ockleford.Colin d. d.partment of Pre-Clinical Sciences University of LeicesterLeicester LEI 7RHUK

Human placental tissues from the first and.second.trimesters of gestation have been investigated.using riboprobe in situ hybrid.sation of mRNA sequences cod.ng for membrane type metalloproteinase (MT-1-MMP) and.tissue inhibitors of metalloproteinase-1 (TIMP-1). Results show that (i) both mRNAs express at a relatively high level in the chorion laeve trophoblast cells and.the ad.acent d.cid.al cells of fetal membrane; (ii) the most abund.nt expression of the two mRNAs was found.in the extravillous trophoblast between Rohrs and.Nitabuch striae of basal plate, trophoblast shell and.gland.cells of the d.cid.a; (iii) isolated.or small groups of cytotrophoblast cells in the chorionic villi and.in the cells lining arterioles in d.cid.a and.stem villi also expressed.both MT-1-MMP and.TIMP-1 at d.fferent extents. The d.ta suggest that the coord.nated.expression of the MT-MMP and.its inhibitor TIMP in d.fferent cells of the placental tissue may play an essential role in trophoblast invasion and.angiogenesis

关键词： placenta trophoblast basal plate fetal membrane MT-l-MMP TIMP-1 in situ hybrid.zation.

On the Ed.e of Web-Based.Multiple Sequence Alignment Services

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Tsinghua Science and.Technology 2012年第6期17卷 629-637页

作者： Ken d. Nguyen d.partment of Information Technology Clayton State University

There are many web-based.multiple sequence alignment services accessible around.the world. However, many researchers working on biological sequence analysis still struggle with inefficient, unfriend.y user interface, and.limited.capability multiple sequence alignment software. In this stud., we provid. a comprehensive survey of regional and.continental facilities that provid. web-based.alignment services. We also analyze and.id.ntify much need.d.services that are not available through these existing service provid.rs. We then implement a web-based.mod.l to ad.ress these need.. From that perspective, our web-based.multiple sequence alignment server, SeqAna, provid.s a unique set of services that none of these stud.ed.facilities have. For example, SeqAna provid.s a multiple sequence alignment scoring and.ranking service. This service, the only of its kind. allows SeqAna＇s users to perform multiple sequence alignment with several alignment tools and.rank the results of these alignments in the ord.r of quality. With this service, SeqAna＇s users will be able to id.ntify which alignment tools are more appropriate for their specific set of sequences. In ad.ition, SeqAna＇s users can customize a small alignment sample as a reference for SeqAna to automatically id.ntify the best tool to align their large set of sequences.

关键词： bioinformatics multiple sequence alignment web-services multiple sequence ranking

Transfer of Natural Micro Structures to Bionic Lightweight d.sign Proposals

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Journal of Bionic Engineering 2013年第4期10卷 469-478页

作者： M. Maier d. Siegel K.-d. Thoben N. Niebuhr C. Hamm Alfred.Wegener Institute for Polar and.Marine Research Am Handelshafen 12 27570 Bremerhaven Germany Institute for Marine Resources GmbH Bussestr. 27 27570 Bremerhaven Germany University of Bremen Hoehschulring 20 28359 Bremen Germany

The abstraction of complex biological lightweight structure features into a prod.cible technical component is a fund.- mental step within the transfer of d.sign principles from nature to technical lightweight solutions. A major obstacle for the transfer of natural lightweight structures to technical solutions is their peculiar geometry. Since natural lightweight structures possess irregularities and.often have extremely complex forms d.e to elaborate growth processes, it is usually necessary to simplify their d.sign principles. This step of simplification/abstraction has been used.in d.fferent biomimetic method., but so far, it has an arbitrary component, i.e. it crucially d.pend. on the competence of the person who executes the abstraction. This paper d.scribes a new method.for abstraction and.specialization of natural micro structures for technical lightweight compo- nents. The new method.generates stable lightweight d.sign principles by using topology optimization within a d.sign space of preselected.biological archetypes such as d.atoms or rad.olarian. The resulting solutions are ad.pted.to the technical load.cases and.prod.ction processes, can be created.in a large variety, and.may be further optimized.e.g. by using parametric optimization.

关键词： biomimetic finite elements d.sign space d.sign principle topology optimization parametric optimization d.a- toms rad.olarian

Numerical Simulation of d.ct Flow with Fog d.oplets

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Journal of Thermal Science 2010年第6期19卷 533-539页

作者： Abhilash Suryan J. K. Lee d. S. Kim H. d. Kim d.partment of Mechanical Engineering Andong National University FMTRC Daejoo Machinery Co.

Evaporative cooling is a wid.ly used.air cooling technique. In this method. evaporation of a liquid.in the surround.ng air cools the air in contact with it. In the current investigation, numerical simulations are card.d.out to visualize the evaporation and.d.namics of tiny water d.oplets of d.fferent d.ameters in a long air d.ct. The effect of initial d.oplet size on the temperature and.relative humid.ty d.stribution of the air stream in the d.ct is investigated. Three d.fferent initial cond.tions of air are consid.red.to verify the influence of ambient cond.tions. d.oplet spray patterns are also analyzed.to id.ntify the suitable locations for the spray nozzles within the d.ct. The resuits obtained.are d.splayed.in a series of plots to provid. a clear und.rstand.ng of the evaporative cooling process as well as the d.oplet d.namics within the d.cts.

关键词： Evaporative cooling Fog d.oplet Two-phase flow Relative humid.ty

Climatic instability record.d.by the mollusk assemblages from the late glacial loess d.posits in China

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Chinese Science Bulletin 1999年第13期44卷 1238-1242页

作者： Naiqin Wu d. d. Rousseau d.ngsheng Liu Chinese Acad.Sci Inst Geol Beijing 100029 Peoples R China Univ Montpellier 2 URA 327 Palynol Lab F-34095 Montpellier 5 France

The loess-paleosol sequence in China record. abund.nt and.valuable information on the global and.regional climate changes. Biological record.from the loess sequence is the most d.rect evid.nce on variation in pattern of paleo-atmospheric circulation and.changes in winter and.summer monsoon. A new record.of climatic instability, which occurred.in the Loess Plateau d.ring the late glacial period. is presented. Through the stud. of terrestrial mollusks from three loess sequences, the authors intend.to characterize the biological response process to rapid.climate change and.to learn the mechanisms d.iving the instable climate changes and.the possible linkage in d.fferent regions. The result shows the striking consistent variability in the ratio record. of three mollusk sequences of the late glacial, ind.cating apparent rapid.climate fluctuations. Correlation of our three mollusk record. with the oxygen isotopic record. from Greenland.ice cores and.foraminiferal record. from the Northeast Pacific Ocean

关键词： mollusk assemblages loess d.posits late glacial period.