简介：Number1GlobalSeaLevelChangeandThermalContributionZUOJuncheng,ZHANGJianli,DULing,LIPeiliang,andLILei

简介：我国渤海、黄海和东海海区,以半日潮流为主。半日潮流计算简单。用图形表示的半日潮流图,使用方便,深受航行人员欢迎。而南海海区,则以全日潮流为主。计算全日潮流,比较复杂,图形表示更困难。因此,航海人员迫切需要也能有一种实用、方便的日潮流图。为满足此种需要,笔者几年来进行了有关方面的调访和研究。根据理论和经验,在马克西蒙夫日潮流分析基础上,引进半日潮流计算原理,并结合南海日潮的特点,推出了航海用的简易的日潮流计算法。此方法在计算和使用上都较方便、简单,图形也直观明了。

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简介：在磁力测量过程中,地磁日变观测站起着至关重要的作用,它是改正磁力测量实施过程中地磁场短期变化的基础.测量成果质量的优劣与地磁日变观测站原始数据的处理与分析有着密切的关系.本文通过理论推导得出一套地磁日变数据改正公式,同时提出了一种全新的改正方法.

简介：Euphausiapacificisanimportantsourceofnaturalastaxanthin.StudieswerecarriedouttoassesstheextractabilityofastaxanthinfromE.pacificusingsubcritical1,1,1,2-tetrafluoroethane(R134a).Toexaminetheeffectsofmultipleprocessvariablesontheextractionyield,astaxanthinwasextractedundervariousconditionsofpressure(30-150bar),temperature(303-343K),time(10-50min),flowrate(2-10gmin-1),moisturecontent(5.5%-63.61%),andparticlesize(0.25-0.109mm).Theresultsshowedthattheextractionyieldincreasedwithtemperature,pressure,timeandflowrate,butdecreasedwithmoisturecontentandparticlesize.Amaximumyieldof87.74%wasobtainedunderconditionsof100bar,333K,and30minwithaflowrateof6gmin-1andamoisturecontentof5.5%.Thesubstantialastaxanthinyieldobtainedunderlow-pressureconditionsdemonstratesthatsubcriticalR134aisagoodalternativetoCO2forextractionofastaxanthinfromE.pacific.

简介：AdetailedsurveyofthereefsintheNanshaIslands’seathatareofstrategicimportanceisconducivetotheirfuturedevelopment.Inthisstudy,atotalof50Landsat8operationallandimager(OLI)imageswereusedtoanalyzethegeologicalfeaturesandspectralcharacteristicsoftheNanshareefs.Theexposedislands/sandbanks,reefflatsandsub-tidalreefswereidentifiedwiththenear-infraredband,theredandgreenbands,andtheblueband,respectively.BasedontherelationshipsamongvariouscharacteristicsandbandsillustratedintheOLIimages,themaximumbetween-clustervariancethresholdalgorithm(OTSUmethod)andthemathematicalmorphologywereemployedtoextractcharacteristicparametersofthespatialgeometryofthereefsfromtoptobottom,whichweresubsequentlyoperatedbyaseriesofpost-processingmethodssuchasvectorization,simplificationandtopologicalanalysis.Amongthe132standalonereefsand16atollsthatareidentifiedinthestudy,fourreefshaveyettobenamedintheStandardNamesofVariousIslandsintheSouthChinaSeaandthewebsiteNanshaIslandsOnline(http://www.nansha.org/).Another24onesareexposedtotheatmosphereevenduringhightides.TaipingIslandwithanareaof0.57km~2representsthelargestexposedgeologicalfeature.Thisstudydemonstratedtheapplicabilityofmedium-resolutionsatelliteimagestoderivethecoralreefinformationeffectivelyandthusprovidedinformationfortherelateddepartmentsthatareresponsibletomanagethecoast.Animprovedresolutionofmultispectralbandswiththepanchromaticbandinhigherspatialresolution(15mforOLIimage)isexpectedtoprovideanoptimumsatellitebasedapproachtomapmarinehabitats.

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.

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简介：TheenvironmentalconditionsaroundthefirstoffshoreHZ21-1steelwellheadplatformintheSouthChinaSeaarecharacterizedbydeepwater,frequenttyphoons,roughwaves,highwatertemperature,severelycorrosiveseawater,andthickfoulingorganismattachments.Thedesignandeffectivenessofgalvanicanodeprotectionsystemarepresented,andseveralmethodsaredescribed,whicharethecalculationmethodoftheprotectivecurrentdensityconsideringthevariationofwaterdepth,themethodofdeterminingprotectionparametersconsideringvariousfactors,thearrangementofanodesbasedonpotentialdistributionandcurrentrequirementsatdifferentwaterdepths,andthemethodofanodeinstallation.Finallytheeffectoftheaccuracyofselectedcathodicprotectionparametersontheeconomicbenefitsofoffshoreprojectsisalsodiscussed..

简介：一、概述SDH—13A型测深仪自1990年装备部队以来,由于无相应的配套检测仪表,所以在仪器修理和长期使用后,其移相精度和校准脉冲宽度无法实时检测和校准;同时该机无数字信号输出,因而不便于实现水深测量自动化。针对这种状况,我们研制了DC—1A型多功能数显接口。该型接口可作为SDH—13A型测深仪的水深显示器使用,亦可用作SDH—13A型测深仪的专用测试仪表,还可作为水深转换接口,以便将SDH—13A型测深仪与Falcon—Ⅳ型微波测距/定位仪或水深测量自动化装置连接起

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简介：TheHY-1AsatelliteisthefirstoceanicsatelliteofChina.Duringthewinterof2002～2003,thedataoftheHY-1AwereappliedtotheseaicemonitoringandforecastingfortheBohaiSeaofChinaforthefirsttime.TheseaiceretrievalsystemoftheHY-1Ahasbeenconstructed.Itreceives1Bdatafromthesatellite,outputsseaiceimagesandprovidesdigitalproductsoficeconcentration,icethicknessandiceedge,whichcanbeusedasimportantinformationforseaicemonitoringandtheinitialfieldsofthenumericseaiceforecastandasoneofthereferencedatafortheseaiceforecastingverification.Theseaiceretrievalsystemofthesatelliteisdescribed,includingitsprocesses,methodsandparameters.TheretrievingresultsandtheirapplicationtotheseaicemonitoringandforecastingfortheBohaiSeaarealsodiscussed.

简介：虽然许多注意被给了描述波浪的模型，潮和沉积运输在足够的详细处理决定在床上的本地变化在深测术的一个相对详细的代表上铺平，远，更少的注意被给了在大得多的规模考虑这个问题的模型(例如象一条潮汐的扁平、潮汐的隧道那样的geomorphological元素的)。这聚集了或lumped模型趋于不表示这些过程详细，但是相当在兴趣的规模捕获行为。如此的模型用平衡集中的概念开发了的是聚集的规模在潮汐的盆和邻近的海岸(ASMITA)之间的词法相互作用。在这份报纸，我们提供一些新卓见进平衡，和是这条建模途径的关键部件的水平、垂直的交换的概念。在一份同伴报纸，我们总结被承担了扩大原来的模型概念的开发的一个范围，到说明概念的框架的灵活性和力量。然而，日益增多地增加详细在详细基于过程的模型和我们给某考虑到在二之间的边界的更多的方向感动模特儿。聚集模型规模的HighlightsThe概念被探索，ASMITA模型的基础详细被构画出在在快规模的基于过程的模型和在聚集的模型使用的水平交换使用了的分散之间的关系被探索提出合适的平衡关系的基础被解释其他的方法包括移流和分散检验。

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简介：以典型渔村——舟山朱家尖月岙村例,分析渔村从改革开放以来发生的社会变迁。利用空间转向作为研究该村社会变迁的切入点,观察渔村在经济社会发展方面的空间转向,展示基于外来渔工这支重要力量对典型渔村带来的变化,分析留守村民与外来渔工所进行的空间重构及空间冲突,揭示一个典型渔村由内外力所塑造的社会变迁。

简介：Thispaperpresentsthetestofashipmodelforthedesignofabackward-bentductoscillatingwatercolumntypewaveenergyconversionsystem,tosupplyelectricpowerforalightship.Thissystemsuggestsanewwaytoproduceelectricpowerautomaticallyforlargelightships.

简介：Cytarabine(1-β-D-arabinofuranosylcytosine,Ara-C),isolatedfromaCaribbeanspongespeciesTethyacrypta,isthefirstantitumordrugfromamarineresource.In1980,theUSFoodandDrugAdministrationapprovedthisdrugforthetreatmentofdifferenttypesofleukemia.Thisdrughasashortplasmahalf-life,lowstability,limitedbioavailability,andseveresideeffects.Toimprovestabilityandbioavailability,wesynthesizedninenovelderivativesbyblockingthecytarabinemetabolicsitesandimprovinglipophilicity.ThecLogPvaluesofthenewlysynthesizedcompoundswerecalculated.Allthesynthesizedcompoundsweremorelipophilicthancytarabine,resultinginmembranepermeabilityandbioavailabilityimprovement.TheantitumoractivitiesagainstleukemiacelllineHL-60wereevaluatedbyusingtheMTTassay.ThebioassayresultsrevealedthattheIC50valuesofcompounds5,8and9were0.080,0.090and0.057μmolL-1,respectively,whichwassimilarwiththatofcytarabine(0.056μmolL-1).Incomparison,compound4withaphosphategroupatO5’wasinactive.Becausephosphoesterbondsareeasilyhydrolyzedbyalkalinephosphataseandarecommonlyusedinproducingprodrugstrategies,compound4mightalsobemetabolizedinvivoandgeneratecompound3orevencytarabinethroughamulti-stepreaction.Thus,compound4mightbeapromisingcompoundtobedevelopedasaprodrug.

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