简介：Byuseofthehydrodynamicmodel,theharmonicconstantsof8principaltidalconstituents(Q_1,O_1,P_1,K_1,N_2,M_2,S_2andK_2)areobtainedfortheEastChinaSea,andtheharmonicconstantofS_aiscalculatedbytwo-dimensionalinterpolation.Thecalculatedresultsagreewellwiththeobserveddataaroundthesea.TheharmonicconstantscanbeusedtopredictthetideintheEastChinaSea.Thecotidalchartsofthe9tidalconstituentsrevealtheirdistribution.

简介：SequencevariationofpartialcytochromebgenesbetweentwoCoiliaspecies,C.ectenesandC.mystus,wasinvestigated.Ofthe402nucleotides,twenty-seven(6.72%)arepolymorphicandallaresynonymoussubstitutions.Atthethirdpositionsofgeneticcondonofcytochromebgene,thetwospeciesshowanextremeanti-Gbias(＜4%)andapronouncedbiastowardsAandC(＞68%).Thereisnoaminoacidsequencedivergencebetweenthepartialcytochromebgenesofthetwospecies,indicatingaclosegeneticrelationshipbetweenthem.Thek-2pgeneticdistanceofpartialcytochromebsegmentofthetwospeciesis0.072,suggestingthatthespecieswereseparated3.6Maago,inthemiddlePliocene.Ourresultrevealsthatthecytochromebgeneisanappropriatemarkerforstudiesofpopulationgeneticstructuresandphylogeographicpatternsofthetwospecies.

简介：Effectsofthemixtureofβ-ecdysoneandpolypodine-B(2:1W/W)onthemoultingandgrowthofprawn,Penaeusorientalisswerestudiedinlaboratorybyrearingtheanimalwiththeaddedcompounddiets.Theresultsshowedthattheadditionofthemoultinghormone(M.H)mixturetocompounddiets,from1.33×10-6to30×10-6,couldincreasemoultingactivityandgrowthrateoftheprawntodifferentextents,amongwhichthe5.33×10-6-10.67×10-6additionhadstatisticallysignificanteffects.However,60×10-6addeddietscausedmoultingandgrowthinhibitionsandcuticlethickening.Theanalysesofprotein,waterandashcontentsoftheprawnshowednoremarkabledifferencesbetweenhormonedosedanimalsandthecontrol.

简介：通过对TOGA—COARE期间的一组锚系仪器阵列资料的分析得出：在赤道西太平洋1°45’S，156°E。海域存在显著的半日潮频内波，它的水平波数（波长）、垂向波数、水平传播速度和垂向传播速度分别约为：3．3×10^-2km^-1（210km），-1．6×10^-3m^-1，2．0m／s，-3．8cm／s。波形向斜下方传播，亦即波能向斜上方传输。它在观测点西南方生成后，向东北方向传播，到达观测海区。流速矢量旋转谱水平随深度的变化呈马鞍形，低谷及深处的峰所在深度分别与南赤道流及赤道潜流的南边界所在深度大体一致。旋转椭圆主轴方位角随深度变化，在浅层（40m处）为北偏东30°，到深处（324m）转为东偏南14°。总体上呈东北方向，表明波来自西南方向。

简介：HC-90D型地磁日变站系统的主体是高精度光泵磁力仪.比较详细地介绍了HC-90D型地磁日变站工作原理,阐述了架设日变站的方法和注意事项.

简介：Acomprehensivestrengthmonitoringsystemusedonafixedjacketplatformispresentedinthispaper.Thelong-termmonitoringofW-11-4Aplatformachieved.Structuralresponses(strainandacceleration)atselectedlocations,aswellasassociatedenvironmentalparameters,havebeenobtained.Theemphasisofthepaperisplacedonthesystemdesign,andtheinstrumentationandoperationmethodologyemployedinthemonitoringofthestructuralresponses.Theperformanceofthesystemandthecharacteristicresultsobtainedduringits13-monthoperationarealsosummarized.

简介：Thispaperpresentsthedetaildesignconditions,designcriteriaandmethodsaswellasdesignconclusionsoftheprocess,structureandcorrosionoftheproductionflowlinesandhighpressurewaterinjectionlinesinBZ34-2/4oilfieldinBohaiBay.AtpresentthisdesignrepresentsthedesigncapabilityandlevelinthefieldofthesubmarinepipelineengineeringofChina.

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简介：Combinedmulti-bodydynamicswithstructuraldynamics,anewdiscreteelementwithflexibleconnector,whichisapplicablefor3-Dbeamstructures,isdevelopedinthispaper.Boththegeneralizedelasticcoefficientmatrixoftheflexibleconnectorandthemassmatrixofdiscreteelementmaybeoff-diag-onalinageneralcase.Thezero-lengthrigidelementisintroducedtosimulatethenodeatwhichmultipleel-ementsarejointedtogether.Itmayalsobeeffectivewhentheaxesofadjacentelementsarenotinthesameline.Theexamplesforeigenvaluecalculationshowthatthemodelissuccessful.Itcanbeextendedtothegeometricnonlinearresponseanalysis.

简介：在视口数据检索之后,视口重建效率成为了影响地形数据三维重建和显示速度的主要因素,视口重建与可利用的开发平台资源密切相关.在剖析Direct3D硬件访问方式的基础上,提出了一套完整的DEM快速重建方法.实验结果表明在相同的条件下,基于Direct3D的视口重建具有明显的速度优势.

简介：FattyacidcompositionsoftwostrainsofmarinediatomsNitzschiaclosterium(MACCB222)andChaetocerosgracilis(MACCB13)havebeenexamined.ThemicroalgaehavebeengrownatdifferentinitialNaNO3concentrations(75,375,750,1125,1500,1875mg/L)andharvestedatthelateexponentialphase.TheresultsbyonefactoranalysisofvarianceshowthattheNaNO3concentrationshavenosignificantinfluenceontherelativegrowthrateoftwostrainsofmarinediatoms;theinfluenceofNaNO3concentrationsonthefattyacidsdiffersfromspeciestospecies.Themajorfattyacidsoftwodiatomstrainsare14:0,16:0,16:ln-7and20:5n-3(EPA),B13alsohashighpercentageof20:4n-6(6.0～9.1%).

简介：Atime-domainmethodisappliedtosimulatenonlinearwavediffractionaroundasurfacepiercing3-Darbitrarybody.ThemethodinvolvestheapplicationofTaylorseriesexpansionsandtheuseofperturbationproceduretoestablishthecorrespondingboundaryvalueproblemswithrespecttoatime-independentfluiddomain.AboundaryelementmethodbasedonB-splineexpansionisusedtocalculatethewavefieldateachtimestep,andthefreesurfaceboundaryconditionissatisfiedtothesecondorderofwavesteepnessbyanumericalintegrationintime.Anartificialdampinglayerisadoptedonthefreesurfacefortheremovalofwavereflectionfromtheouterboundary.Asanillustration,themethodisusedtocomputethesecond-orderwaveforcesandrun-uponasurface-piercingcircularcylinder.Thepresentmethodisfoundtobeaccurate,computationallyefficient,andnumericallystable.