学科分类
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50 个结果
  • 简介:Gymnarchusniloticusswimsbyundulationsofalong-baseddorsalfin,whileitsbodyaxisisinmanycasesheldstraightduringswimming.ThispaperprovidesabriefrelevantintroductiontoGymnarchusniloticus,whichbelongstotheAfricanfreshwaterelectriceelsbutcaninspireourbionicinterestsinpropulsionbesidesitsabilitiesinelectricsensing.AspeciallarvaofGymnarchusniloticuswasmorphologicallymeasuredbyphotographingitwithapieceofscale-calibratedpaperasthebackground.ThenweanalyzedthedatabyaCFD-aidedapproach.DetailedflowpatternsaroundthelarvaandaNACA0012hydrofoilwererespectivelycalculatedandvisualizedattheReynoldsnumberof7350orso.TheresultsshowthattheprofileofGymnarchusniloticusiswellstreamlined.

  • 标签: 仿生学 体育运动 游泳 身体结构 形态学 CFD分析
  • 简介:一个城市的边界层模型(UBLM)被合并大楼的效果与改进一部分拖系数和一顶高度分布式的华盖拖长度规模。改进UBLM被使用与不同height-to-width比率在北京区域上在三典型的城市的块上模仿风地。为比较,在一样的块上的风地被明确地解决大楼的一个城市的子域规模模型模仿。从二个不同方法模仿的风地在好同意。然后,为北京的二维的造的词法特征和城市的华盖参数从造高度数据详细说明被导出。最后,experiements被进行用改进UBLM在北京在风地上调查大楼的效果。

  • 标签: 建筑物高度 北京地区 形态特征 风场模拟 城市街区 边界层模式
  • 简介:Itiswidelyacceptedthatthedesignofmorphologicalfilters,whichareoptimalinsomesense,isadifficulttask.Inthispaperanovelmethodforoptimallearningofmorphologicalfilteringparameters(Genetictrainingalgorithmformorphologicalfilters,GTAMF)ispresented.GTAMFadoptsnewcrossoverandmutationoperatorscalledthecurvedcylindercrossoverandmaster-slavemutationtoachieveoptimalfilteringparametersinaglobalsearching.Experimentalresultsshowthatthismethodispractical,easytoextend,andmarkedlyimprovestheperformancesofmorphologicalfilters.Theoperationofamorphologicalfiltercanbedividedintotwobasicproblemsincludingmorphologicaloperationandstructuringelement(SE)selection.Therulesformorphologicaloperationsarepredefinedsothatthefilter'spropertiesdependmerelyontheselectionofSE.Bymeansofadaptiveoptimizationtraining,structuringelementspossesstheshapeandstructuralcharacteristicsofimagetargets,andgivespecificinformationtoSE.Morphologicalfiltersformedinthiswaybecomecertainlyintelligentandcanprovidegoodfilteringresultsandrobustadaptabilitytoimagetargetswithclutterbackground.

  • 标签: 图像合成 形态滤波器 自动目标探测
  • 简介:Thispaperintroducesanoveltechniqueforobjectdetectionusinggeneticalgorithmsandmorphologicalprocessing.Themethodemploysakindofobjectorientedstructureelement,whichisderivedbygeneticalgorithms.Thepopulationofmorphologicalfiltersisiterativelyevaluatedaccordingtoastatisticalperformanceindexcorrespondingtoobjectextractionability,andevolvesintoanoptimalstructuringelementusingtheevolutionprinciplesofgeneticsearch.Experimentalresultsofroadextractionfromhighresolutionsatelliteimagesarepresentedtoillustratethemeritandfeasibilityoftheproposedmethod.

  • 标签: 目标提取 遗传算法 形态学程序 人造卫星 图象
  • 简介:Toinvestigatethemorphologicalchangesofspermatozoaintheproximalvasdeferensaftervasectomy.Methods:Proxinalvasdeferensfluidswerecollectedfrom79fertilemen(groupA)and64vasectomizedmen(groupB)duringtheoperationsofvasectomyorvasovasostomy.SpermmorphologyintheproximalvasdeferenswasanalyzedafterstainingwiththemodifiedPapanicolaoumethod.Results:ThepercentageofspeImatozoawithanormalovalheadfromgroupB(50.7%±21.7%)wassignificantlylowerthanthatofgroupA(75.2%±11.1%).ThedataingroupAwassimilartothoseofnormalsemenandthereforerepresentsthephysiologicalconditionoftheproximalvasdeferensspermoffertilemen.TherewerenosignificantdifferencesinthepercentagesofnormalovalheadsingroupBwiththetimesincevasectomy.Condusion:Aftervasectomy,thespermatozoaintheproximalvasdefereusandepididymiswerecontinuouslydegeneratingandbeingreplenishedbyspenmatozoacomingfromtestis.Theobviousmorphologicaldegenerationoccurredinthespermtailandspermatozoawithasmalloralheadandamorphousheadswereincreased.(AsianJAndrof1999Jun;1:61-65)

  • 标签: 男性 生殖健康 输精管切除术 精子 附睾
  • 简介:为Protoperidinium种类的分类和鉴定在它的分类学习期间是最困难的工作。在这研究,Protoperidinium的分类地位被跟踪它的分类历史澄清,23种类在中国的海岸上属于类Protoperidiniumpreliminarily被识别,并且词法描述和板模式为每种被给。类似的种类的关键差别也在这研究被讨论,我们相信那P。oceanicum和P。murry,P。tumidum和P。fatulipes,P。水珠和P。majus是分开的种类;P。diabolum应该被当作有效名字而不是报导名字Peridiniumglobosum或Peridiniumlongipes;在P之间的分类关系。punctulatum和P。subinerme要求进一步的学习。

  • 标签: 多甲藻 物种 形态鉴别 分类历史 体育活动 沿岸
  • 简介:AIMToobservethetherapeuticeffectofmoxibustiononulcerativecolitisanditsinfluenceonthecolonicmucosalmorphology.METHODSForty-sixpatientswithulcerativecolitiswererandomlydividedintothemoxibustionwithherbalmedicineunderneathgroupandthewesternmedicinegroup.Thirtypatientsweretreatedwiththeabovemoxibustionand16patientswithSalicylayefapyridine(SASP).Thecolonicmucosaof13patientsinthemoxibustiongroupwasobservedbycolonoscopybeforeandafterthetreatment.MucinwasalsoanalyzedbyH.EandAB-PASstaining.RESULTSSeventeenpatientswereclinicallycured,12wereimprovedand1unchangedinthemoxibustiongroup.Inthecontrolgroup,5patientswereclinicallycured,7improvedand4unchanged.ThirteenpatientswithactiveUCweretakenasthesubjectsforhistopathologicanalysisinthisstudy.Thecolonicmucosallesionswereremarkablyimprovedandthecharacteristicofthemucinalsochanged.Inmostsections,thechronicinflammationofmucosawasgeatlyameliorated(P<0.01).Theinflammatorycellinfiltratationmuchdecreasedandneutrophils,disapearedinmostsections(P<0.001).Thegobletcellssignificantlyincreased(P<0.001);cryptparacryptabscessormucosalulcerationwasseen(P<0.001).CONCLUSIONTherateofcureofulcerativecolitisbymoxibustionwithherbalmedicinebeneathissuperiortothatbySASP.Thissortofmoxibustioncaneffectivelyimprovethecolonicmucosallesionsandrestoretheproportionofmucoproteintonearnormal.

  • 标签: colitis ulcerative/therapy MOXIBUSTION intestinal MUCOSA morphological
  • 简介:在这份报纸,我们基于一般一个维的morphodynamic模型执行理论分析让河以便显示出一条河的词法平衡怎么走水路被影响并且沿着河的沉积转向/供应。分析的结果沿着更低的黄河证明大规模浇消遣,象那些一样,能引起凸的河床侧面的发展在长期。免职将沿着河的整个活动范围发生,与增加的免职深度从对下游在上游。河床的斜坡增加从对在上游下游。而且,词法时间规模上的分析证明在更低的黄河的这开发将花一时间大概到世纪的十年的时期。分析的结果与在更低的黄河的观察相比。自从1980年代的后半部,从黄河的大规模水消遣一直在发生。观察证明这确实沿着河导致了重要沉积。

  • 标签: 河床 导流渠 黄河 泥沙沉积
  • 简介:Tappingmodeatomicforcemicroscopehasbeenappliedtoobservesingle-chainPMMAparticleswhichwerestoredforsixmonthsatroomtemperatureaftersprayedfromverydilutesolutionsingoodsolvents,good/poormixedsolvents,andathetasolvent.Monodis-persePMMAstandardsofmolecularweightsrangingfrom7.90×10~4to1.3×10~6wereusedtoinvestigatetheeffectofmolecularweightohthesizeofthesingle-chainPMMAparticles.Thesesingle-chainparticlesshowedclosetosphericalshapes.Themorphologyofsingle-chainPMMAparticlesofagivenmolecularweightwasfoundtobeidenticalinspiteofdifferentsolventsusedforsolutionspraying.Molecularweighdependenceoftheparticledimensionwasalsofound.Thediametersofsingle-chainPMMAparticlesaftercorrectionoftlp-geometryeffectwerecomparedtothevaluesestimatedfrommolecularweightanddensity.

  • 标签: ATOMIC force MICROSCOPE Morphology SINGLE-CHAIN particle
  • 简介:糟糕描述的海洋的板补品有睫,TintinnopsisbrasiliensisKofoid&坎贝尔,1929,从Qingdao的太平天国的披肩镇定,中国,词法上在protargol受精以后基于永久准备被调查并且与另外的相关同种的物相比。根据infraciliature,三个睫的组能被认出,它在标本之中揭示很稳定的结构并且表示infraciliature的模式是除了古罗马胸甲的特征,为种类鉴定的一个高度可靠的标准。

  • 标签: 表膜下纤毛系 形态特征 海岸 深海 有机体 纤毛孢子
  • 简介:Theeffectofvinylacetate(VA)contentinethylenevinylacetate(EVA)copolymeronthemechanicalpropertiesofpolypropylenewasinvestigated.ThreedifferentEVAcopolymerswithconcentrationsof3wt%,6wt%,9wt%,12wt%and15wt%,wereblendedtopolypropylene.Themechanicalpropertiessuchasyieldandtensilestrengths,elasticmodulus,Izodimpactstrength,hardnessandmeltflowindexoftheblendswereinvestigated.Relationshipbetweentypeofvinylacetateandconcentrations,mechanical,MFIandmorphologicalpropertieswereexplored.

  • 标签: 醋酸乙烯 机械性能 形态结构 聚丙烯
  • 简介:在在过量水里沸腾以后由蒸气米饭谷物炖能被用于完美地煮米饭。在伊朗的米饭的三个变化煮的这个过程的效果(唱了Tarom,Domsiyah和Fajr)在上组织上并且煮的米饭谷物的词法性质被调查。结果证明在煮的米饭的这步减少了坚硬并且显著地增加了米饭谷物的粘着性。由扫描电子显微镜学的使用,蒸气炖的煮的米饭的外部表面在与非炖的样品相比煮,和淀粉小粒的更好的gelatinization和更多扩大期间由于修正有更少的孔和更靠近的毛孔,这被显示出。在煮提供的米饭的这个过程的使用一充分煮了并且gelatinized,更软、更粘的最后的产品被推荐。

  • 标签: 形态特性 米饭 烹饪 扫描电子显微镜 结构
  • 简介:有建议激活的apoptosis在呼喊的人的精子发信号否定地影响他们的授精潜力的证据的基本身体。然而,发信号的这apoptotic是否是与精子发生有关的未成功的apoptosis的一件遗物,仍然是争论的或如果它应该在导致stereotypical的成熟精子被认为是一条功能的preformed小径词法变化思考原子拆卸。探讨这个问题,apoptosis在密度坡度centrifugation充实的成熟、不成熟的呼喊的人的精子用betulinic酸被导致。apoptosis的执行被经由传播电子显微镜学观察极端词法的变化监视。在体的房间的apoptosis的典型词法符号与apoptotic身体,损害mitochondrial正直,原子信封的缺点,和原子破碎的形成包括血浆膜blebbing;这些形态学也在人的精子被观察了。另外,这些apoptotic特征在与成熟精子相比的不成熟的精子是更经常的。后面的betulinic酸处理,apoptosis相关的词法变化从健康施主在成熟精子被导致。这效果更不在不成熟的精子被读。而且在两部分,betulinic酸处理增加了反应acrosome的精子的百分比。我们的极端词法的学习的结果在成熟呼喊的人的精子证明apoptosis的功能的胜任。一个唯一的未成功的过程的理论可能为不成熟的精子仅仅是有效的。由刺激apoptosis的acrosome反应的正式就职可能使精子apoptosis的生物关联清楚些。

  • 标签: 形态学特征 细胞凋亡 成熟精子 精子发生 密度梯度离心法 感应
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  • 简介:Thispaperproposesalanedetectionalgorithmbasedonmulti-structureelementmodelofmorphological.Theinnovativepointofthealgorithmliesinthefactsthattheflexiblestructurehasthemulti-structureelementsthatlanemodelfeatureshave,andthatthealgorithmadoptsthemorphologicalfilteringprincipletoextractthepixelsintheimage,whichissimilartothelanemodel.Inthealgorithm,theinterestedareaisextractedbyamodeloftrapeziumfromoriginalimage,whichisdetectedbytheoperatorofCanny,andthelanesareextractedbythestructureelements,whichhavesimilarcharacteristicstothatoflanemodel.SeverallinesaredetectedbyHoughtransformation,thenthetrafficlanesarereconstructed.Experimentsshowthatthisalgorithmissimpleandrobust,andcanefficientlydetectthelanemaskaccuratelyandquickly.

  • 标签: 多结构元素 CANNY算子 Hough变换 检测模型 特征提取 测算法
  • 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。

  • 标签: 分子水平 形态学 亚麻 海藻 纤维直径 平均长度
  • 简介:ThemorphologicalchangeofSt/DVBcrosslinkedgelsduringchloromethylationwasstudiedbyfluorescencespectroscopyusingSt/DVBcrosslinkedandhypercrosslinkedgelsascontrolsamples.Ithasbeenfoundthatwithincreaseofchlorinecontent,theexcimeremissionband(~325nm)approachestovanish,whiletheintensityofmulti-ringaggregateemissionband(~420nm)quicklyreachesamaximum,andthendecreasessharplyaccompaniedbyappearanceofanewbroadbandcentredatca488nmwhichroughlycoincideswiththetypicalemissionbandofhypercrossllinkedSt/DVBgels.Mearwhile,theresultofIRmeasurementsuggeststhatmethylenebridgebetweenphenylringsformsandincreaseswithchloromethylationprocess.Theseresultsareexplainedintermsofasidereactionofpost-crosslinking,whichdensifiesthelooselycrosslinkednetworksandundoesthedenselyentangledmicrogelnuclei.Asaresult,themorphologyofthecrosslinkedgelsbecomesmorehomogeneouswithchloromethylation.

  • 标签: 交联聚苯乙烯 氯甲基化作用 荧光光谱学 超交联溶胶 形态转换