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1.
酒泉地区早期石窟分期试论暨远志ClassificationoftheEarlyCavesinJuquanAreaJiYuanzhiTheearlygrottoesdiscoveredinJuquanareacontainmainlytheMt.Wen...  相似文献   

2.
安西旱峡石窟李春元TheHanxiaGrottoesisAnxi¥LiChunyuanTheHanxiaGrottoesislocatedatthefootofHangorgealongthewesternsideofBiaoganmountain,...  相似文献   

3.
INTRODUCTIONItisafundamentalproblemincomputeraidedgeometricdesign (CAGD)andmanufacturetofindtheintersection (Laneetal.,1 980 ;Wang ,1 984;Sederbergetal.,1 986)oftheparametriccurves.SincemostofthecurvesinCAGDaredenotedbypolynomialsorrationalpolynomials,tofindtheirint…  相似文献   

4.
ApplicationofFTAMinGlobalRoamAcountSystemFangNingsheng(方宁生)(DepartmentofCommputerScienceandEngineering,SoutheastUniversity,N...  相似文献   

5.
ISTHENOVELDEAD ?Therehasbeennolackofpropheciesofthedeathofthenovelsincethebeginningofthe2 0thcentury .Manyprestigiouscritics,suchasT .S .Eliot,OrtegaY .Gasset,AlbertoMoraviaandCyrilConnolly ,haverelentlesslypronounceddeathsentenceonthenovel.Althoughthousandso…  相似文献   

6.
·Reviews·PhysicalandMathematicalModelingoftheArgon OxygenDecarburizationRefiningProcessofStainlessSteelWEIJi He  (1 )………………………………………………………………………………………………………·Letters·SteganographicTechniqueCapableofWithstandingRQPAnalysisWANGShuo Zhong ZHANGXin Peng ZHANG…  相似文献   

7.
INTRODUCTIONFluiddynamicsresearchreliesontheexperi mentalobservationandvisualizationoffluidflowphenomena (Kawashima,G .etal.,1 995;Oh ba ,K .etal.,1 995) .Advancesincomputertechnologyallowformoreaccuratesimulationandcomputationforthisphenomenon .DigitalParticleImag…  相似文献   

8.
1IntroductionGeneticalgorithms(GAs)wereproposedtosolveplanning,scheduling,oroptimizationproblemsin1970s.GAssimulatenaturalevo...  相似文献   

9.
StressAnalysisoftheGlassBulbof35-inch(V)120°ColorPictureTubeTorongeyPeterKimanus(MoiUniversity,DepartmentofPhysics,P.O.Box390...  相似文献   

10.
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   

11.
OnColegeEnglishClasroomResearchLinLiechengItisadecadesincethecaryingoutoftheCOLLEGEENGLISHTEACHINGSYLLABUS.Wearenowfacedwith...  相似文献   

12.
Everylittleimprovementofthejournaldependsonthestrongsupportfromthereviewers .WetakethisopportunitytogiveourheartfeltthankstoreviewersinChinaandabroadfortheirhelpsincetheestablishmentofthejournal.Dr.MartinPircher  W SydneyUniv.AustraliaDr.JosefBailer Aus.…  相似文献   

13.
初中数学升学复习测试题精编──解三角形(二)一、填空题1.若四边形ABCD内接于圆,则cosA+cosB+cosC+cosD=2.△ABC中,已知sinA:sinB:sinC=3:5:7,那么最大角是度。3.△ABC中,a=b=1,c,则三个内角为4...  相似文献   

14.
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   

15.
成果集锦     
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   

16.
ARandomMultiAccessMethodforDataServicesinCDMACelularSystemLiZhen(李振)YouXiaohu(尤肖虎)(NationalMobileCommunicationsResearchLabor...  相似文献   

17.
ADiscussionOntheRangeofMeaningofEnglishWords──AnApproachtoEnglishWordsLearningQiHaoZhenSuccessinEngllshrequiresaknowledgeofwo...  相似文献   

18.
Thephilosophyofrapidprototypingandmanufac turing (RP&M)is“layeredmanufacturingandlayer by layeraccumulating” .TheRP&Mtechnologyisdrivenbythree dimensionalCADmodelandmakesCAD/CAMin tegrated .ThesefeaturesofRP&Mmakeitwidelyap pliedinmanyindustrialfieldssuchas…  相似文献   

19.
Magnetic Fields in Disc-Type Permanent Magnet MachinesTX1IntroductionAtwo-dimensional(2D)analyticalmethodforcom-putingtheaxial...  相似文献   

20.
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   

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