Investigation of Separated Flow around a Curved Air Intake

Nomenclaturex,y,g,11Cartcsiatlandcurvilinearcoordinatesif,v,U.j,'physicalvelocitycomponentsandcontl'avat7ian[velocitycomponCntsk,eturbulen[bineticcnet'gyanditsdissipationA)nl,nctlturbulent,lanlinarandof'l'ectivcviscositiesfdin\lsioncoel'tlcientRe.,Reynold…     

非谓语动词考例精彩再现

非谓语动词包括不定式(to)+V.,现在分词v-ing和过去分词v-ed三种形式,它是历届中考的热点之一。现结合近两年中考试题作一小结和分析,希望能对同学们复习、备考有所帮助、启示。茯一、考查(to)+v./ v.-ing形式作宾语(1) 只用(to)+v.作宾语的动词有de-cide, hope, want, wish, learn等,需接“疑问词+不定式”作宾语的动词(短语)有tell, show, know, teach, wonder, find out等。如:1、(2004沈阳)I hope______good job in a foreign company after I graduate school.A. to find; fromB. finding; fromC. to find; at …     

Fan 型条件与泛连通性

设G是n(≥5)个顶点的简单图.本文证明了若对G的任意一对距离为2的顶点u,v都有max{d(u),d(v)}≥(n+1)/2成立,则G中任一对顶点x和y之间存在长为6到n-1的路.,Let G be a simple graph with n(≥5) vertices. In this paper, we prove that if G is 3-connected and satisfies that d(u,v)=2 implies max {d(u),d(v)}≥(n+1) /2 for every pair of vertices u and v in G, then for any two vertices x, y of G, there are (x,y)-paths of length from 6 to n-1 in G, and there are (x,y)-paths of length from 5 to n-1 in G unless G[(N)(x)]=G[(N)(y)]≌K4or K5, or G[(N)(x)],G[(N)(y)]are complete and (N)(x)(n)(N)(y)=φ.     

现代汉语构词层的轻动词制图研究

轻动词不是以单一数量存在,而是一个集合.轻动词这个集合可以包含v(Instru-ment)、v(Material)、v(Manner)、v(Location)、v(Source)、v(Reason)、v(Time)、v(Role)、v(Aim)、v(Causation)、v(Result)、v(Experience)、...     

Visible region extraction from a sequence of rational Bézier surfaces

INTRODUCTION Computing the visible portions of parameteriz surfaces is a fundamental problem for Comput Graphics, Computer Aided Design, Computer Visio and so on. Generally, a common solution to getti the visible region of the parameterized surfaces is use discrete methods including Z-Buffer (Greene al., 1993), Hierarchical Occlusion Map (HOM (Zhang et al., 1997), Ray-Tracing (Toth, 1985), an tessellating the surface with its u and v isoparametr curves (Maghrabi and Griffiths, 198…     

一类高阶非线性椭圆型方程组弱解的正则性——祝贺三十周年校庆

<正>证明非线性椭圆型方程组弱解的部分正则性主要有两种方法:直接方法和间接方法。前者取决于逆Holder不等式(参见[2;ch.v——Ⅵ]),后者关键在“blow up”技巧(参见[2;ch.Ⅳ])。最近,L.C., Evans, E., Giarruso等人在[1]、[4]中引进了一种新的技巧——用直接方法但不用逆Holder不等式,在Hilbert空间W~(1,2)(Ω,R~N)中研究了二阶拟线性椭圆方程组。     

维生素C的高效液相色谱检测方法研究

建立了反相高效液相色谱法分离和测定维生素C的方法.使用C8色谱柱(150mm×4.6mmi.D.,5μm)作为固定相,通过对流动相的缓冲盐种类、pH值、有机溶剂的比例等实验条件的考察,确立了以pH2.5的磷酸缓冲液,甲醇(98/2,v/v)作为流动相,246nm作为检测波长的最佳色谱条件.用该检测方法对维生素C与苯甲酸钠的共存情况进行考察,发现在不同pH值情况下,维生素C与苯甲酸钠的水溶液在80℃共存2h,两者不发生反应.     

《牛津小学英语》中的双性词

water(n.水)water(v.浇水),lif(tv.举起)lif(tn.电梯),last(adj.过去的)last(v.持续),study(n.书房)study(v.学习),watch(n.手表)watch(v.观看),milk(n.牛奶)milk(v.挤奶),fly(v.飞行)fly(n.苍蝇),stop(v.停止)stop(n.停车站),colour(n.颜色)colour(v.上颜色),clean(adj.清洁)c     

Analysis of digenic epistatic effects and QE interaction effects QTL controlling grain weight in rice

INTRODUCTIONKilo-grainweight,characteristicallyacom-plextrait,isanimportantcomponentofyieldinrice.QTLmappingforkilo-grainweightofricewascon-ductedusingpopulationsofF2(Linetal.,1996),doubledhaploidlines(Luetal.,1997),recombi-nantinbredlines(Xiaoetal.,1996),backcrosstestcross(Xiaoetal.,1995;Lietal.,1997)andratoonedF2(Lietal.,2000).Consideringthesen-sitivityofkilo-grainweighttoenvironments,Luetal.(1997)andZhuangetal.(1997)comparedthedifferentialdetectionofQTLacrossenvironmentstodetermin…     

Analysis of stimulated Brillouin scattering in multi-mode fiber by numerical solution

INTRODUCTIONPhaseconjugationviastimulatedBrillouinscattering (SBS)iswidelyusedinMOPAsystemofpulsedsolid statelasers (Eichleretal.,1997a ;1998;2 0 0 0 ;Offerhausetal.,1996)andothertypesoflasers (Eichleretal.,1996;Kurnitetal.,1989;Filippoetal.,1992 )tocompe…     

φ—满射环上正交群的自同构

Jean Dieudonne给出了域上On(v)及On^ (v)的自同构,以后,B.R.McDonald、游宏、王仁发相继给出局部环、半局部环上On(v)的自同构，冯红给出了局部环上On^ (v)的自同构，本运用DCD方法给出了φ-满射环On(v)及OnT^ (v)的自同构。     

幂等元半环上的Green(L+)∩(L·)-关系

给出了幂等元半环S满足Green-(L+)∩(L·)关系的充要条件:a(L+)L+∩(L·)b(=)(存在u,v∈S)a=(u+v)(v+u+v)(u+v),b=(v+u+v)(u+v);对(L+)L+∩(L·)关系是S上的同余作了进一步刻划.     

《牛津小学英语》中的双性词

wate(rn.水)wate(rv.浇水),lif(tn.电梯)lif(tv.举起),las(tadj.过去的)las(tv.持续),study(n.书房)study(v.学习),watch(n.手表)watch(v.观看),milk(n.牛奶)milk(v.挤奶),fly(n.苍蝇)fly(v.飞行),stop(n.停车站)stop(v.停止),colour(n.颜色)colour(v.涂颜色),clean(adj.清洁)c     

也谈“v(正)＞v(逆)平衡一定正向移动”

关于化学平衡移动的问题一直是中学化学的重点也是难点.在中学化学教学中,老师们经常这样讲:如果改变影响平衡的一个条件,使v(正)>v(逆),则化学平衡一定向正反应方向移动.刘老师在《中学化学教学参考》2010年第8期撰文"‘v(正)>v(逆)平衡一定正向移动’引发的思考"中(以下简称刘文)表述:v(正)>v     

Effective extraction of elastase from Bacillus sp. fermentation broth using aqueous two-phase system

INTRODUCTION Aqueous two-phase system (ATPS) is widely used in biochemistry and biotechnology for purifica- tion of proteins (Diamond and Hsu, 1992; Balasubramaniam et al., 2003), enzymes (Pan et al., 2001; Bim and Franco, 2000), amino acids (Li et al., 2002), antibiotics (Yang et al., 1994; Guan et al., 1994), nucleic acids (Ohlsson et al., 1978; Kimura, 2000), aroma compounds (Marco et al., 2000) and lactic acid (Planas et al., 1998). ATPS is mainly composed of two-incompatible p…     

Virtual and Dynamic Hierarchical Architecture:an overlay network topology for discovering grid services with high performance

INTRODUCTION Grid (Foster et al., 2001) technology is one ofthe most important ones to appear in recent years.The recent big progress is that scientists (Foster etal., 2002; Roure et al., 2001; Rana and Walker,2002) proposed service-oriented architectures suchas Open Grid Services Architecture (OGSA) (Fos-ter et al., 2002) that integrated the so-called com-putational/data Grid architecture (Foster et al.,2001) with Web services (Grid Web ServicesWorkshop, 2001). In the service-ori…     

8.北约2011年自主招生物理试题

1.(1)组员跳上车的过程系统动量守恒.临界情况对应n个组员跳上车后车厢速度为v0,则n·m·2v0=(nm+ 2m)v0.解得n=2. (2)设第一个组员跳下车后车厢速度为v1,则由动量守恒定律,得: (2m+ 2m)v0=(m+2m)v1+m(u+v1). 第二个组员跳下车后车厢速度为v0/2,则由动量守恒定律,得: 3mv1=2m·v0/2+m(v0/2+u).     

关于第二型曲面积分的符号问题

当曲面S用参数方程x=x(u,v),y=y(u,v),z=z(u,v)表示时,化第二型曲面积分为二重积分的计算公式原来为(?)s(x,y,z)dxdy=±(?)f[x(u,v),y(u,v),z(u,v)]c dudv,本文将它改进为(?)s(x,y,z)dxdy=±(?)f[x(u,v),y(u,v),z(u,v)]|c|dudv.使得积分号前的正负号的选择在某些情况下(例如对常见的教材和吉米多维奇著的数学分析习题集里的例题和习题)由难交易。     

A new photonic bandgap cover for a patch antenna with a photonic bandgap substrate

INTRODUCTIONInvestigationofphotonicbandgap(PBG)materialsiscurrentlyoneofthemostactivefron-tiersinengineeringandphysics.PBGmaterialshaverecentlyemergedasanewmultidisciplinaryfieldofstudy(Kesleretal.,1996;Yablonovitch,1994;SimovskiandHe,2001).APBGstructurecanhaveabandgapwithinwhichelectromagnetic(EM)wavepropagationispreventedinalldirec-tions(Joannopoulosetal.,1997;Ozbayetal.,1994).Foratwo-dimensionalPBGmaterial,thepropagationofanEMwavewithinitsbandgapispreventedinalldirectionswithin…     

数学科

本试卷分第I卷(选择皿)和第皿卷(非选择肠)两娜分,共150分.2.在等比数列{。。}中,已知a, aZ a3一6,aZ a3 a。 二一3,记S,~al a: a3十… a.,则lin 5.等于第I卷(选择题共60分)().(A)16(B)24(C)誓(D)32一、透择.(本大.共12小题,每小肠5分,共‘0分, 在每小.给出的四个选项中,只有一项是符合题目 共求的.)1.集合A~(川xeN且。3},则AnB中由两个元素组成的子集有3.正三棱锥V一ABC的三条侧棱上分别有尸、Q、R三 点,若v,一,v尸一专·,vQ一专a,v;一合一‘a> 0)则三棱锥V一尸QR与V一ABC的体积比为(). (A)1:189(B)1:2…