简介：Thegrowth,biochemicalcontentandbioaccumulationquantityof2,2’,4,4’-tetrabromodiphenylether(BDE-47)inSkeletonemacostatumwerestudiedunderdifferentN:Pratios(1,4,16,64and128).AllcellularbiochemicalcontentsofS.costatumpresenteddecreasingtrendovercultivationtime.Atearlystageofcultivation,thecellularprotein,carbohydrateandlipidinS.costatumpresentedhighervaluesintreatmentsofN:P=4and16.However,theywerelowerinthesetreatmentsatthelatestage,buthigherintreatmentsN:P=1and128.Similarly,BDE-47levelspercellofS.costatumwerehigherintreatmentsofN:P=4and16atearlystageofcultivation,whichwere3.8and3.7ng(106cells)-1,respectively.Atthemiddlestageofcultivation,theBDE-47levelperS.costatumcelllowered;anditfurtherreducedinthetreatmentsofN:P=4and16atthelatestagewiththevalues0.6and0.5ng(106cells)-1,respectively.However,itroseinN:P=128,reachingupto2.3ng(106cells)-1.ComparedwithBDE-47percell,BDE-47peralgalvolumeunderdifferentN:Pratiosdidnotpresentobviousdifference.ThequantityBDE-47accumulatedpercellofS.costatumwaspositivelycorrelatedwithprotein,carbohydrateandlipidpercell;meanwhile,theBDE-47pervolumehadapositivecorrelationwithbiochemicalcontentpervolume.ThevariationofbioaccumulationabilityofBDE-47inS.costatumcanbeexplainedbybiochemicalchangesduetoN:Pratios.

简介：Fifty-sevenstations(48gridstationsandninestratifiedstations)weresampledacrossthestudyregion(67.000°–88.394°N,152.500°–178.643°W)duringthe4thChineseNationalArcticResearchExpedition(CHINARE4)fromJulytoAugust2010bytheicebreakerR/VXuelong.Atotalof24speciesofHydromedusaewereidentifiedfrom130zooplanktonsamples,ofwhichsevenspeciesbelongedtoAutomedusa,eightspeciestoAnthomedusae,fourspeciestoLeptomedudae,andthreespeciestoSiphonophora.CatablemamulticirratumKishinouye,1910,BougainvilliabitentaculataUchida,1925,andEuphysajaponica(Maas,1909)wererecordedforthefirsttimeintheArcticsea.Inthepresentpaper,18speciesofHydromedusaeweredescribedandillustrated,ofwhichthreespeciesweredescribedforthefirsttimeintheArcticsea,and15speciesweredescribedforthefirsttimeinChina.

简介：腐蚀抵抗无电在钠氯化物答案从12%～14%与磷的内容捏存款被学习。存款沉浸于3.5%NaCl答案让29d获得电气化学的参数；分别地为15d在标准盐水花测试被检验。存款的腐蚀抵抗被potentio动态的扫描学习，电气化学的阻抗光谱学(EIS)，X光检查衍射(XRD)；扫描电子显微镜学(FE-SEM)的冷地的排放与一个精力装备了散X光检查察觉者(EDX)。XRD的模式；FE-SEM的结果证明准备存款是非结晶的。但是在15d标准盐水花测试以后，一些针孔出现在存款的表面上；存款的表面上的磷的重量内容更高(它对钝化电影的形成有益)当因为镍的溶解重量比磷的大，镍内容更低时，比那，在标准盐前，水花测试。从potentio动态的扫描的结果；EIS证明钝化电影在NaCl答案在沉浸以后在Ni-P存款上形成了，它减少了腐蚀率捏样品。这个工作的结果在海洋的腐蚀显示出他们的潜在的应用。

简介：CytochromeP450(CYP)superfamilyisoneofthemembershiplargestandfunctionmostdiverseproteinsuperfamilyrecogniozedamonglivingbeings.Membersofthissuperfamilywerefurtherassignedtodifferentfamiliesandsubfamiliesbasedontheiraminoacidsimilarities.Accordingtotheirphylogeneticrelationships,theCYPgeneswhichlikelydivergedfromcommonancestorgeneandmaysharecommonfunctionsweregroupedintooneclan.Widelydistributingscallopsareagroupofthemostconspicuousbivalve;howeverthestudiesontheirCYPisacarce.Inthisstudy,wesearchedthegenomeandexpressedsequencetagsofZhikongscallop(Chlamysfarreri)forCYPgenes.Intotal,88non-redundantCYPwereidentified,whichwerehomedin13CYPsgenefamilies.Phylogeneticanalysisdividedthesegenesinto4CYPclans.Asindeuterostomes,Clan2wasthelargest,whichcontained33genesbelongingtoCYP1,CYP2,CYP17andCYP356families.Clan3contgained19genesbelongingtoCYP3,CYP5andCYP30families.Clan4contained23genes,allbelongingtoCYP4family.ThemitochondrialCYPclancontained9genesbelongingtoCYP10andCYP24families.Incomparison,protostomes(C.farreri,D.pluex,D.melanogaster)containedmoreCYPgenesthandeuterostomes(S.purpuratusandvertebrates)inClan2butlessgenesinClan3andClan4.OurfindingswillaidtodecipheringCYPfunctionandevolutioninscallopsandbivalves.

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

简介：Comparedtotowedstreamers,ocean-bottomseismometers(OBS)obtainbothS-wavedataandricherwavefieldinformation.Inthispaper,theinducedpolarizationmethodisusedtoconductwavefieldseparationonOBSdataobtainedfromtheShenhuareaintheSouthChinaSea.AcomparisonofthechangesinP-andS-waves,andacomprehensiveanalysisofgeologicalfactorswithinthearea,enableanalysisanddescriptionoftheoccurrenceofnaturalgashydrateinthestudyarea.ResultsshowanincreaseinP-wavevelocitywhennaturalgashydrateexistsintheformation,whereastheS-wavevelocityremainsalmostconstant,asS-wavescanonlypropagatethroughtherockskeleton.Therefore,thebottom-simulatingreflection(BSR)responseoftheP-waveisbetterthanthatoftheS-waveinthefrequencyanalysisprofile.Inawide-anglesection,therefractivewaveofthehydratelayerisevidentwhenusingP-wavecomponentsbutidentificationisdifficultwithS-wavecomponents.ThisvelocitymodelillustratesthesensitivityofPandS-wavecomponentstogashydrate.TheuseofthispolarizationmethodandresultsofanalysisprovidetechnicalandtheoreticalsupportforresearchonhydratedepositsandothergeologicalfeaturesintheShenhuarea.

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

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简介：测定了相手蟹属（Sesarma）红螯相手蟹（S．haematocheir）和褶痕相手蟹（S．plicata）线粒体16SrRNA基因部分片段的序列，二者的序列长度相同，均为533bp，且A、T、G、C的含量相似，分别为198bp（37．1％），206bp（38．6％），84bp（15．8％），45bp（8．4％）和200bp（37．5％），205bp（38．5％），81bp（15．2％），47bp（8．8％）；二者的序列有49处差异，其中21个位点为转换、22个位点为颠换和6个缺失／插入位点。进一步对20种相手蟹属蟹类的长度为361bp的16SrRNA基因同源序列进行分析，发现AT的含量为78．6％～82．9％，明显高于GC的含量，且存有91个变异位点。从NJ树和遗传距离来看，在分布于中国的3种相手蟹中，无齿相手型（S．dehaani）和红螯相手蟹的亲缘关系最近（d=0．0151），而它们与褶痕相手蟹的亲缘关系则较远（d=0．0924／0．09231。分布于中国的相手蟹和分布于北美的相手蟹之间存在着较大的遗传距离（差异），表明它们之间有着较远的亲缘关系，互为单系起源。

简介：首先给出了GPS伪距单点定位的几种主要误差的改正模型：电离层延迟、对流层延迟、地球自转改正、相对论效应改正等，然后采用双频伪距改正电离层延迟影响并利用IGS精密星历，通过算例来分析双频P码伪距单点定位的精度。

简介：在2015年9月16日，有Mw的大小的地震8.3发生了从Illapel近海的46km，智利，产生在Coquimbo测量的4.4-m本地人海啸。在这研究，海啸的特征被观察和数字模拟的分析的联合基于USGS和NOAA的来源介绍。深水里的16个飞镖浮标的记录，沿着海岸的十个潮汐的计量器近地，并且十个沿海的计量器在远地被使用Fourier分析学习。数字模拟基于非线性的浅水方程和嵌套的格子被执行提供全面海啸繁殖情形，并且结果在深水里与观察匹配很好并且然而并非在关上到震中的海岸好。由于到震中和南部的秘鲁和智利的架回声的短距离，最大的振幅从0.1m到2m，除了Coquimbo。在深水里，浮标的最大的振幅从9.8厘米腐烂了到0.8厘米，建议厘米规模和平宽的海啸，当管理时期是13-17min和32min时。而在远地的沿海的区域，海啸波浪放大了在到0.8m的0.2m附近，主要由于从海岸的助跑效果和回声思考。尽管海啸在深水里是相对中等的，它仍然在本地区域和farfield的海岸生产了非可以忽略的海啸危险。

简介：Onthebasisofthetemperatureobservationsduring1961-2000inChina,sevencoupledgeneralcirculationmodels'(GCMs)extremetemperatureproductsareevaluatedsuppliedbytheIntergovernmentalPanelonClimateChange's4thAssessmentReport(IPCC-AR4).Theextremetemperatureindicesinusearefrostdays(FD),growingseasonlength(GSL),extremetemperaturerange(ETR),warmnights(TN90),andheatwavedurationindex(HWDI).Resultsindicatethatallthesevenmodelsarecapableofsimulatingspatialandtemporalvariationsintemperaturecharacteristics,andtheirensembleactsmorereliablethananysingleone.Amongthesevenmodels,GFDL-CM2.0andMIROC3.2performancesaremuchbetter.Besides,mostofthemodelsareabletopresentlineartrendsofthesamepositive/negativesignsastheobservationsbutforweakerintensities.Thesimulationeffectsaredifferentonanationwidebasis,with110°Nasthedivision,east(west)ofwhichtheeffectsarebetter(worse)andthepoorerovertheQinghai-TibetanPlateauinChina.Thepredictionsforthe21stcenturyonemissionsscenariosshowthatexceptdecreasesintheFDandETR,otherindicesdisplaysignificantincreasingtrend,especiallyfortheindicesofHWDIandTN90,whichrepresentthenotableextremeclimate.Thisindicatesthatthetemperature-relatedclimateismovingtowardstheextreme.Inthelate21stcentury,theGSLandTN90(HWDI)increasemostnotablyinsouthwestChina(theQinghai-TibetanPlateau),andtheFDdecreasemostremarkablyintheQinghai-TibetanPlateau,northwestandnortheastofChina.ApartfromSouthChina,theyearlychangerangeoftheextremetemperatureisreducedinmostofChina.

简介：对只接收到一组GPS卫星广播星历的情况下应用广播星历拟合计算卫星在轨位置的方法进行了研究，通过与精密星历进行比较，对拟合计算的精度进行了说明。

简介：Huanghe河三角洲是世界的大河之一，自从最后，Huanghe河里的Huanghe河三角洲paleoenvironmental进化是一个热问题冰川。基于联合AMS14核心DYZK1沉积标明日期在的C在亚底部侧面上Huanghe河三角洲和声学的顺序沉没了，phytolith分析在96件沉积样品上被执行。谷物尺寸参数，磁性的危险性与biostratum的垂直变化被相结合重建在Huanghe河三角洲的paleo沉积、气候的条件。在索引参数有一条重要垂直变化法律的学习结果表演，和Huanghe河三角洲的那沉积环境经历了河的facies-sealand转变的进化进程外形潮汐的完全外形浅海的faciesdelta外形自从26.0kaB。P...phytolith分析结果如下。第一，phytoliths被划分成矛尖状，光滑伸长，多刺伸长，一种特殊格律，长矩形，bulliform和其它类型。在不同sedimental环境，phytolith内容定期变化，显示phytolith在沉积环境有的一样装配稳定性的某个度。第二，矛尖状，phytoliths的光滑伸长和多刺伸长范畴在潮汐的扁平的外形和三角洲免职有更大的内容，当时一在浅海的外形的更小的内容和河的外形环境。通过变化系数的比较分析，第三，在沉积的主要phytolith范畴的内容在sealand转变外形和河的外形免职有一个更大的变化振幅，当在tidalflat外形和三角洲外形免职是更稳定的时。

简介：制图资料sourcematerial;cartographicdocument编制地图所需要的测量控制成果、地图、航片、遥感图像和文字等各种资料。根据使用程度可分为基本资料、补充资料和参考资料。制图精度mappingaccuracy地图绘制各工序,包括展绘数学基础,线划描绘和制图综合的精确程度。

简介：交向摄影convergentphotograph在摄影基线两端，两摄影机主光轴在物方相交成某一角度的摄影。等倾摄影equallytiltedphotograph在摄影基线两端，两摄影机主光轴保持平行，相对于水平面倾斜相同角度的摄影。