简介:TheenvironmentalconditionsaroundthefirstoffshoreHZ21-1steelwellheadplatformintheSouthChinaSeaarecharacterizedbydeepwater,frequenttyphoons,roughwaves,highwatertemperature,severelycorrosiveseawater,andthickfoulingorganismattachments.Thedesignandeffectivenessofgalvanicanodeprotectionsystemarepresented,andseveralmethodsaredescribed,whicharethecalculationmethodoftheprotectivecurrentdensityconsideringthevariationofwaterdepth,themethodofdeterminingprotectionparametersconsideringvariousfactors,thearrangementofanodesbasedonpotentialdistributionandcurrentrequirementsatdifferentwaterdepths,andthemethodofanodeinstallation.Finallytheeffectoftheaccuracyofselectedcathodicprotectionparametersontheeconomicbenefitsofoffshoreprojectsisalsodiscussed..
简介:格林macroalgaeChaetomorphaaerea和C。linum分类地被糊涂。在这份报纸,我们试试词法、分子的分析分开这二种。C。aerea和C。linum能与词法characteritics被区分开来,例如复叶尺寸,房间尺寸和形状,他们的吝啬的长度/宽度比率(LWR),和房间围收缩。C的Thalli。aerea由顶往底地稀释与在上面的部分的直径270-500m,在中间的部分的160-360m,在基础部分的100-160m。为上面的部分,房间的长度是不到他们的直径。房间墙通常在隔膜压缩,它透明或无色并且给细丝beaded外观。相反,C的thalli。linum经常在一样的个人,以内有90-300m的一条经常的直径房间墙通常不压缩,房间是圆柱的或塑造的桶。LWR比C的大。aerea。结果证明在二种之间的pairwise距离为它的区域是为18SrRNA基因和53.5%-54.3%的3.6%-3.7%。在发展史,他们在远clades散布,它在分子的水平证实基因分叉。另外,词法数据显示C的那条细丝直径。linum样品是高度可变的,从90m到300m。然后这二种能被看作分开种类。
简介:Thegeophysicalmodelfunction(GMF)describestherelationshipbetweenbackscatteringandseasurfacewind,sothatwindvectorscanberetrievedfrombackscatteringmeasurement.TheGMFplaysanimportantroleinoceanwindvectorretrievals,itsperformancewilldirectlyinfluencetheaccuracyoftheretrievedwindvector.Neuralnetwork(NN)approachisusedtodevelopaunifiedGMFforC-bandandKu-band(NN-GMF).EmpiricalGMFCMOD4andQSCAT-1areusedtogeneratethesimulatedtrainingdata-set,andGaussiannoiseatasignalnoiseratioof30dBisaddedtothedata-settosimulatethenoiseinthebackscatteringmeasurement.TheNN-GMFemploysradiofrequencyasanadditionalparameter,soitcanbeappliedforbothC-bandandKu-band.Analysesshowthattheσ0predictedbytheNN-GMFiscomparablewiththeσ0predictedbyCMOD4andQSCAT-1.AlsothewindvectorsretrievedfromtheNN-GMFandempiricalGMFCMOD4andQSCAT-1arecomparable,indicatingthattheNN-GMFisaseffectiveastheempiricalGMF,andhastheadvantagesoftheuniversalform.