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1.
Thephilosophyofrapidprototypingandmanufac turing (RP&M)is“layeredmanufacturingandlayer by layeraccumulating” .TheRP&Mtechnologyisdrivenbythree dimensionalCADmodelandmakesCAD/CAMin tegrated .ThesefeaturesofRP&Mmakeitwidelyap pliedinmanyindustrialfieldssuchas…  相似文献   

2.
STOCHASTICINTERPOLATIONMETHODFORFRACTALMODELSZhaoLindu(赵林度)ShengZhaohan(盛昭瀚)(SchoolofEconomicsandManagement)STOCHASTICINTERPO...  相似文献   

3.
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   

4.
TheResearchonMethodologyforMaterialCodeStandardizationintheImplementationofMRP-ⅡSunYu(孙虞)(DepartmentofComputerScienceandEngin...  相似文献   

5.
Abstract : IncinerationasamethodofreducingMunicipalSolidWaste (MSW)volumeandrecoveryofener gyhasbeendevelopedgraduallyinChina .Moreattentionispaidonpolychlorinateddibenzo p dioxinsandpolychlorinateddibenzofurans (PCDD Fs)formedinMSWincinerationprocess .Thisp…  相似文献   

6.
命题 设△ABC的面积为△ ,三边长分别为a、b、c.则△ABC的内接正三角形的最小面积为 △236(a2 +b2 +c2 ) + 2△.图 1证明 :如图 1所示 ,正△PQR内接于△ABC ,BC =a ,CA=b ,AB =c.设∠BRP =θ,则易求得∠PQC =∠A+ 60° -θ .再设△PQR的边长为x ,则分别在△BRP和△PQC中 ,由正弦定理可得BP =sinθsinBx ,PC =sin(∠A + 60°-θ)sinC x.又因BP +PC =BC =a ,故x = asinθsinB+sin(∠A +6 0° -θ)sinC=asin(∠A +6 0°)sinC ·cosθ+…  相似文献   

7.
1 Introduction IntheimplementationofCIMSinenterprises,thedevelopmentoftheCAD/CAMtechnologyandtheap pearanceofmatureCAD/CAMsoftwareprovidereliableandefficientdesigntoolsfortheexploitationanddevel opmentofproducts.UGII (aCAD/CAMsoftwareofEDScorporation)hasb…  相似文献   

8.
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   

9.
DampingPropertyofaNewTypeofPMCsCompositeHeDeping(何德坪)(DepartmentofMaterialsScienceandEngineering,SoutheastUniversity,Nanjing...  相似文献   

10.
第一部论述中国电大的英文专著──评介“RadioandTVUniversities:TheMainstreamofChina’sAdultandDistanceHigherEducation”赵宇辉第一部由中国的远距离教育研究者撰写的英文专著“Rad...  相似文献   

11.
I.语音:找出下列每组单词中划线部分发音与众不同的选项(5分)()1,A.cake B.baby C class D.same()2.A.very B.help C.seven D.basket()3,A.worry B.over C.come D.mother()4.A.thing B.with C.river D.fine()5.A.full B.jump C.bus D.number()6. A. book B、room C. broom D.school ()7. A. please B.sweater …  相似文献   

12.
A卷 1.在所给单词中找出划线部分读音不同的词(5分) ()1.A.place B.safe C.wake D.have ()2.A.she B.these C.letter D.metre ()3. A. wide B, nice C. live D. white ()4.A.dog B,those C.shop D.forgot ()5.A.excuse B.number C.student D.Tuesday ()6.A.farm B.hard C.warm D.card ()7.A.whose B.whole C.wh…  相似文献   

13.
1 Introduction Withthedevelopmentofthe powerelectronicstechnology ,stationarypowerconvertingdevicessuchasAC DCconvertersandDC ACinvertersareappliedinvariousindustrialareas .However ,thishasledtosomeproblems ,e .g .theincreaseofharmonicsinpowersupply ,andtheEM…  相似文献   

14.
RemoteCommunicationandControlofaRobotUsingMMSDingXinquan(丁心泉)(DepartmentofComputerScienceandEngineering,SoutheastUniversity,...  相似文献   

15.
INTRODUCTIONInrecentyearsLChasbecomethemostcommontherapeuticmodalityforcholelithiasis.(Fruzee ,R .C .etal.,1 993 )ThefindingofCBDstonesbyintraoperativecholangiographyisthemajorreasonforresortingtoopencholecyc tectomy .ThisresearchwasdonetocomparecombinedLCandE…  相似文献   

16.
InAugust 2 0 0 2 ,theHumanResourceDevelop mentTrainingTeamfromtheEU ChinaProgrammefortheDevelopmentofVocationalTrainingforIn dustryvisitedHubeiXiangfanVocationalandTechni calCollege.DuringtheDetailedTrainingNeedsAnalysisac tivitiestheHRDTeamvisitedXiangfanVo…  相似文献   

17.
ANewFastAlgorithmforComputing2DDiscreteCosineTransformWuHongwen(吴红文)(ThermalEnergyEngineeringResearchInstitute,SoutheastUniv...  相似文献   

18.
ShapeOptimalDesignofHydrodynamicBearingBasedonDynamicCharacteristicsChenYunfei(陈云飞)QianRuiming(钱瑞明)(DepartmentofMechanicalEng...  相似文献   

19.
从DNA结构的发现看现代科研选题的特点   总被引:1,自引:0,他引:1  
从DNA结构的发现看现代科研选题的特点徐炎章1951年8月,年仅二十三岁的沃森(JamesD·Watson1928──)从美国来到英国剑桥大学卡文迪什实验室,与正在攻读博士学位的克里克(FramisCrick,1916─—)合作,研究DNA结构。到1...  相似文献   

20.
敦煌西夏洞窟分期再议   总被引:2,自引:0,他引:2  
敦煌西夏洞窟分期再议刘玉权AThoroughDiscussionofClassifcationofWesternXiaCavesofDunhuangLiuYuquanTheworkofclassificationoftheWesternXiacave...  相似文献   

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