共查询到20条相似文献,搜索用时 15 毫秒
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酒泉地区早期石窟分期试论暨远志ClassificationoftheEarlyCavesinJuquanAreaJiYuanzhiTheearlygrottoesdiscoveredinJuquanareacontainmainlytheMt.Wen... 相似文献
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INTRODUCTIONItisafundamentalproblemincomputeraidedgeometricdesign (CAGD)andmanufacturetofindtheintersection (Laneetal.,1 980 ;Wang ,1 984;Sederbergetal.,1 986)oftheparametriccurves.SincemostofthecurvesinCAGDaredenotedbypolynomialsorrationalpolynomials,tofindtheirint… 相似文献
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ApplicationofFTAMinGlobalRoamAcountSystemFangNingsheng(方宁生)(DepartmentofCommputerScienceandEngineering,SoutheastUniversity,N... 相似文献
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ISTHENOVELDEAD ?Therehasbeennolackofpropheciesofthedeathofthenovelsincethebeginningofthe2 0thcentury .Manyprestigiouscritics,suchasT .S .Eliot,OrtegaY .Gasset,AlbertoMoraviaandCyrilConnolly ,haverelentlesslypronounceddeathsentenceonthenovel.Althoughthousandso… 相似文献
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《上海大学学报(英文版)》2002,(4)
·Reviews·PhysicalandMathematicalModelingoftheArgon OxygenDecarburizationRefiningProcessofStainlessSteelWEIJi He (1 )………………………………………………………………………………………………………·Letters·SteganographicTechniqueCapableofWithstandingRQPAnalysisWANGShuo Zhong ZHANGXin Peng ZHANG… 相似文献
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INTRODUCTIONFluiddynamicsresearchreliesontheexperi mentalobservationandvisualizationoffluidflowphenomena (Kawashima,G .etal.,1 995;Oh ba ,K .etal.,1 995) .Advancesincomputertechnologyallowformoreaccuratesimulationandcomputationforthisphenomenon .DigitalParticleImag… 相似文献
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1IntroductionGeneticalgorithms(GAs)wereproposedtosolveplanning,scheduling,oroptimizationproblemsin1970s.GAssimulatenaturalevo... 相似文献
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StressAnalysisoftheGlassBulbof35-inch(V)120°ColorPictureTubeTorongeyPeterKimanus(MoiUniversity,DepartmentofPhysics,P.O.Box390... 相似文献
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一、选择题1 .sin2 π12 -cos2 π12 的值为 ( ) (A) -12 (B) 12 (C) -32 (D) 322 .已知cosαcos β+sinαsin β =0 ,那么sinαcosβ-cosαsin β的值为 ( ) (A) -1 (B) 0 (C) 1 (D)± 13 .已知f(tanx) =cos 2x ,则 f -22 等于( ) (A) -2 23 (B) 0 (C) 13 (D) -14.化简1 +sinθ-cosθ1 +sinθ+cosθ等于 ( ) (A)tanθ (B)cotθ (C)tan θ2 (D)cot θ25 .如果 1 -tanA1 +tanA… 相似文献
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《中山大学学报论丛》1996,(3)
OnColegeEnglishClasroomResearchLinLiechengItisadecadesincethecaryingoutoftheCOLLEGEENGLISHTEACHINGSYLLABUS.Wearenowfacedwith... 相似文献
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Everylittleimprovementofthejournaldependsonthestrongsupportfromthereviewers .WetakethisopportunitytogiveourheartfeltthankstoreviewersinChinaandabroadfortheirhelpsincetheestablishmentofthejournal.Dr.MartinPircher W SydneyUniv.AustraliaDr.JosefBailer Aus.… 相似文献
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请看下面几道高考题 :1 .CarolsaidtheworkwouldbedonebyOctober,personallyIdoubtverymuch .(NMET’99)A .it B .that C .when D .which2 .ismentionedabove ,thenumberofthestudentsinseniorhighschoolisincreas ing .(NMET’99上海 )A .Which B .As C .That D .It3.Dorothywasalwaysspeakinghighlyofherro… 相似文献
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裘良 《中学数学教学参考》2001,(10)
广义射影定理定理 在△ABC中 ,AD是高 ,AB =c,AC =b.(1 )若D在边BC上 ,则AD2 -CD·BD =AC2-BC·CD =AB2 -BD·BC =bccosA ;(2 )若D在BC或CB的延长线上 ,则AD2 CD·BD =AC2 ±BC·CD =AB2 BD·BC =bccosA .证明 :(1 )当D与B或C重合时 ,等式显然成立 .当D在BC上时 ,如图 ,记∠CAD =α ,∠BAD =β ,则cosA =cos (α β)=cosαcosβ-sinαsin β=ADb ·ADc -CDb ·BDc=AD2 -CD·BDbc .∴AD2 -CD·BD =bcc… 相似文献
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ARandomMultiAccessMethodforDataServicesinCDMACelularSystemLiZhen(李振)YouXiaohu(尤肖虎)(NationalMobileCommunicationsResearchLabor... 相似文献
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《信阳师范学院学报(哲学社会科学版)》1994,(2)
ADiscussionOntheRangeofMeaningofEnglishWords──AnApproachtoEnglishWordsLearningQiHaoZhenSuccessinEngllshrequiresaknowledgeofwo... 相似文献
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Thephilosophyofrapidprototypingandmanufac turing (RP&M)is“layeredmanufacturingandlayer by layeraccumulating” .TheRP&Mtechnologyisdrivenbythree dimensionalCADmodelandmakesCAD/CAMin tegrated .ThesefeaturesofRP&Mmakeitwidelyap pliedinmanyindustrialfieldssuchas… 相似文献
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Analytical solutions for the two-dimensional magnetic fields in disc-type permanent magnet machines 总被引:1,自引:1,他引:0
Zhang Yuejin Xie Guodong 《上海大学学报(英文版)》1998,2(4):290-294
Magnetic Fields in Disc-Type Permanent Magnet MachinesTX1IntroductionAtwo-dimensional(2D)analyticalmethodforcom-putingtheaxial... 相似文献
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命题 设D、E、F分别是△ABC的边BC、CA、AB上的周界中点 ,且BC =a ,CA =b,AB =c ,s=12 (a +b +c) ,△AEF、△BDF、△CDE、△ABC的面积分别记为△A、△B、△ C、△ ,△ABC的外接圆半径为R .则有 ∑(s-a)△ A=△22R.证明 :由三角形周界中点的定义知s=AB +AE =c +AE ,s=AC +AF =b +AF ,则AE =s-c,AF =s-b .又∵sinA =a2R,sinB =b2R,sinC =c2R,∴△A =12 AE·AF·sinA=12 (s-c) (s-b)· a2R=a4R(s-b) (s-c) .故 (s-a)△A=… 相似文献