学科分类
/ 25
500 个结果
  • 简介:"如果说在我现在的篮球生涯中还有什么里程碑想达到,那当然就是拼得一枚NBA冠军戒。来到这里真的让我觉得有非常浓厚的机会可以得偿夙愿,一圆梦想。"

  • 标签: 太阳 里程碑 篮球 冠军 球员 球队
  • 简介:and ,to ,from 

  • 标签:
  • 简介:喜欢跑快攻的太阳队,今年夏天很简单地又找了一位"跑锋"希尔(GrantHill),帮他们的快速反击再添一把利刃。之所以说"简单",是因为太阳队没花什

  • 标签:
  • 简介:THESTUDYOFTHECHARACTERISTICSOFBOUNDARYLAYEROVERHILLTERRAINHaoWeifeng(郝为锋),LiuKai(刘凯)(MeteorologicalCollegeofAirForce,Nanjing2...

  • 标签: PLANETARY boundary layer HILL TERRAIN WIND
  • 简介:研究在Kaptai水库被进行,之一最大人造东南亚洲的淡水湖,使用为钓鱼和其它决定水质量和它的适用性的现在的地位。水采样从在在五个不同地点从的0.2和0.8部分深度的水库的中间的部分对下游的viz在上游。Burburichara,Maichchari,Subolong,Basanthakum,和Rangamati。水分析证明NO3-N,K+和全部的P的集中,和根本,采样驻扎的推迟的固体在为鱼文化的推荐价值以外。Na+的集中,Ca2+,Mg2+,SO42?,Cl?,全部的溶解固体(TDS),溶解的氧()并且化学的氧需求(货到付款)在为水产业的标准以内。NO3-N的集中,SO42?,K+和全部的P没与深度显示出明确的趋势,地点象一样多雨并且旱季。浇pH,传导性,Na+和HCO3吗?内容在雨季是更低的,并且做并且在在两个的几乎所有地点更高的货到付款深度,与旱季相比。TDS的全部的固体和集中,,货到付款,Ca2+,Mg2+和Na+是更高的在在上游、减少逐渐地向在水库下游。集中并且Ca2+和pH更高并且在0.2-fractional深度的Mg2+更少比那些在在几乎所有地点的0.8-fractional深度。水库处于包含NO3-N和全部的P的高集中的mesotrophic状况,在有从在镇附近的城市的污染的过多的推迟的固体的存在的惊人地位。为由于如此的恶化在水库保护水质量采用措施是必要的。

  • 标签: 水库水质 孟加拉国 吉大港 化学需氧量 总溶解固体 磷浓度
  • 简介:Inthispaper,antiplaneresponseofanisoscelestriangularhilltoincidentSHwavesisstudiedbasedonthemethodofcomplexfunctionandbyusingmovingcoordinatesystem.Thestandingwavefunction,whichcansatisfythegoverningequationandboundarycondition,isprovided.Furthermore,numericalexamplesarepresented;theinfluencesofwavenumberandangleoftheincidentwavesandtheangleofthehill'speakongroundmotionarediscussed.

  • 标签: 地震 震波 物理特性 传播介质
  • 简介:ThispapergivesatutorialonhowtoproveLyapunovtypecriteriabyoptimalcontrolmethods.Firstly,weconsiderstabilitycriteriaonHill'sequationswithnonnegativepotential.Byoptimalcontrolmethodsdevelopedin1990s,weobtainseveralstabilitycriteriaincludingLyapunov'scriterion,Ne..gauzandLidski'scriterion.Secondly,wepresentstabilitycriteriaonHill'sequationswithsign-changingpotentialinwhichBrog'scriterionandKrein'scriterionareincluded.

  • 标签: stability CRITERIA optimal control method Hill's
  • 简介:在每个分解阶段的森林土壤性质上的崽秋天和它的效果在热带季风被调查三种植园(7年的相思树种植园,15年的相思树种植园和18年的混合种植园)和从孟加拉国的Chittagong多山的区域的一个自然森林(Sitapahar森林)的气候的条件。结果证明有机物的全部的累积与种植园年龄增加了,与年度累积率的减少伴随。在一样的植被类型以内,有山上的显著地改变的腐植质(p≤0.05)的新鲜、部分分解的垃圾的器官的累积放,在底部斜坡上是最高的并且在森林里向山顶逐渐地减少。在土壤有机物的累积的反向的趋势在15年的相思树auriculiformis种植园,燃料木头在哪儿收集了被显示出。在7年、15年的相思树和18年的混合宽广离开的种植园,全部的有机物生产由组成评价新鲜,在土壤的部分并且完全分解的垃圾以及合并有机物是2554.31,705.79和1028.01kg·h−1·a−1,分别地,并且从新鲜垃圾的相应贡献是38.23,19.40和30.48kg·h−1·a−1,分别地。在三种植园和自然森林,在一般水准上,新鲜垃圾组成了32.45%,部分与腐植质13.50%分解了垃圾并且合并了在有0.90厘米的吝啬的崽厚度的土壤54.56%全部的有机物生产的有机物。土壤酸味随有机物的分解舞台的增加增加了。

  • 标签: 干物质积累 大港地区 孟加拉国 森林
  • 简介:Thepatternofthesubtletraps,inwhichoilandgasaccumulated,intheburied-hillfaultedzoneintheJiyangsagisverycomplicated,andveryhardtoprospect.Thepaperanalysesthemaindifficultiesinexploringthecomplicatedburied-hillfaultedzoneoftheareafromapointofgeology.Thetypicalpatternoftheburied-hillzoneintheJiyangsagisstudiedusingtheforwardmodeling.Target-orientlayoutdesignandfull3-Dseismictechnology,whichareusefulforoilandgasexplorationonthezone,areputforward.Takingtheexplorationforoilandgastrapsonthezoneasanexample,certaintechnologiesandtheeffectoftheirapplicationsaboutthedesignfortargetacquisition,acquisitiononawide-azimuth,pointsourcesandpointreceiversarediscussed.

  • 标签: 地震勘探 潜丘 油气聚集 地质调查
  • 简介:AnanalyticalsolutionforscatteringofplanePwavesbyasemi-cylindricalhillwasderivedbyusingthewavefunctionexpansionmethod,andconvergenceofthesolutionandaccuracyoftruncationwereverified.Theeffectofincidentfrequencyandincidentangleonthesurfacemotionofthehillwasdiscussed,anditwasshownthatahillgreatlyamplifiesincidentplanePwaves,andmaximumhorizontaldisplacementamplitudesappearmostlyattheinclinedincidenceofwaves,whicharelocatedatthehalf-space;andmaximumverticaldisplacementamplitudesemergemostlyattheverticalincidenceofwaves,whicharesituatedatthehill.

  • 标签: 地震 震波 分散度 有限元分析
  • 简介:AnanalyticalsolutionforscatteringofincidentSHwavesbyacircular-archillwithaconcentriccirculartunnelwasderivedbyFourier-Besselseriesexpansionandauxiliaryfunctionstechnique.Thesolutionisreducedtosolvingasetofinfinitelinearalgebraicequationsfinally.Theaccuraciesofthenumericalresultsarecheckedbytheresidualerrorsofboundaryconditionswiththetruncationorderincreasing.Thenumericalresultsshowthattheexistenceanddimensionofthetunnelhavegreateffectonmotionofthegroundsurfacenearbyanddynamicstressconcentrationofthetunnel.

  • 标签: HILL TUNNEL SCATTERING PLANE SH WAVES
  • 简介:ThispaperpresentstheHillinstabilityanalysisofTensionLegPlatform(TLP)tetherindeepsea.The2-Dnonlinearbeammodel,whichisundergoingcoupledaxialandtransversevibrations,isapplied.ThegoverningequationsarereducedtononlinearHillequationbyuseoftheGalerkin'smethodandthemodessuperpositionprinciple.TheHillinstabilitycharteduptolargeparametersisobtained.AnimportantparameterMisdefinedandcanbeexpressedasthefunctionsoftetherlength,theplatformsurgeandheavemotionamplitudes.Someexamplestudiesareperformedforvariousenvironmentalconditions.Theresultsdemonstratethatthenonlinearcouplingbetweentheaxialandtransversevibrationshasasignificanteffectontheresponseofstructure.ItneedstobeconsideredfortheaccuratedynamicanalysisoflongTLPtethersubjectedtothecombinedplatformsurgeandheavemotions.

  • 标签: Hill不稳定性 参数振动 TLP 横向振动
  • 简介:rrawanaResourcesNL在一份声明中表示,位于西澳大利亚东部金矿地区的巴尔德(BaldHill)锂矿和钽矿有望正式开启锂精矿的投产计划。公司总经理Calderwood在声明中表示,调试预计在两个月内开始。公司预计将于今年4月进行第一次实物交付。

  • 标签: 锂精矿 投产 西澳大利亚 总经理 预计 钽矿
  • 简介:Background:The‘Khasihillsal'forestecosysteminMeghalaya,Indiarepresentstheeasternmostlimitofsaldistribution.Wetestediftreediversityandcompositionalheterogeneityofthisecosystemwashigherthanothersal-dominatedforestsduetomoisterenvironment.Methods:Vegetationwassampledin11transectsof10mwidthandupto500mlengthcovering5.2haarea.Allstems≥10cmgirthatbreastheightwereenumerated.Results:WefoundapatternofmixeddominanceofShorearobusta(sal)andSchimawallichiiandco-dominanceofPinuskesiyaandCareyaarborea.TheShannon'sdiversityindex(H′)was3.395nats.ThisvalueisremarkablyhighandcompetitivetothatofmoistsalforestsofeasternHimalayanfoothillsandsal-dominatedforestsofTripura.AhighvalueofH′wasmanifestedby:a)highspeciesrichness(S=123),b)goodequitability(70.6%),c)‘fair'resourceapportionment,andd)abundanceofrarespecies(84%specieswithlessthanonepercentoftotalindividuals,67%specieswithtwoorlessindividualsha-1and59%specieswithoneorlessindividualsha-1).Thecompositionalheterogeneitywas‘fair'(Whittaker'sβw=3.15).ThepresenceofFagaceaewithsixspeciescommanding4.3%ofimportancevalue(IVI)andofapine(P.kesiya)insalforestwasremarkable.Asmanyas58speciesshowed‘lowdensity(≤10individualsha-1),uniformdispersion',fivespeciesachieved‘higherdensity(>10individualsha-1),uniformdispersion'andsixofthetop10specieswere‘clumped'.Theforestshowedanexponentialdemographiccurveillustrating‘good'regenerationofanexpandingcommunity.Verticalstratificationwassimplewithapoorcanopyandfairsubcanopy,whichtogetherwithlowbasalarea(15.65m2·ha-1forindividuals≥10cmgbh)indicatedloggingofmaturesaltreesinthepast.Conclusions:The‘Khasihillsal'forestecosystemisricherinalphaandbetadiversitythanmostsal-dominatedforests,butpastlogginghasreducedbasalarea.Selectiveremovalofsmal

  • 标签: 森林生态系统 物种丰富度 树种多样性 SAL 西山 印度
  • 简介:摘要目的探讨肩关节后脱位伴反Hill-Sachs损伤的诊疗。方法回顾性分析2022年8月至2022年11月青岛大学附属医院关节外科收治的2例男性肩关节后脱位伴反Hill-Sachs损伤患者。病例1,男性46岁,右肩关节,伤后1 d入院;病例2,男性57岁,右肩关节,伤后2 d入院。2例患者致伤原因均为电击伤,均为新鲜骨折,且损伤面积均>50%。均采用胸大肌三角肌入路,对塌陷的肱骨头进行解剖复位后植入人工骨并多枚埋头螺钉固定。分别采用肩关节Constant-Murley评分和视觉模拟评分(VAS)对患者治疗后的肩关节功能及疼痛进行评价。结果2例患者均未发生切口感染、臂丛神经和血管损伤等围术期并发症。术后3个月复查:病例1,肩关节前屈110°,外展90°,外旋(中立位)30°,内旋(中立位)70°,Constant-Murley肩关节评分70分,VAS评分3分。病例2,肩关节前屈130°,外展120°,外旋(中立位)50°,内旋(中立位)80°,Constant-Murley肩关节评分75分,VAS评分2分。结论对于肩关节后脱位伴反Hill-Sachs损伤,肱骨头塌陷>50%的患者采用切开复位螺钉内固定术加人工骨植骨术可取得较好的近期疗效。

  • 标签: 肩关节 肩脱位 创伤和损伤 反Hill-Sachs损伤
  • 简介:摘要本文讨论用偏微分方程构建Hill密码的方法。以一阶线性非齐次双曲方程混合问题的形式给出加、解密问题的模型,由差分格式算法设计可用于加、解密的矩阵方程。改进的Hill密码系统中,矩阵变化多样、密钥空间大且便于传输和管理。最后用Matlab编制软件实现并对部分结果进行分析。

  • 标签: 密码 一阶双曲方程 Hill密码 模拟
  • 简介:Underwaterrobotisanewresearchfieldwhichisemergingquicklyinrecentyears.PreviousresearchesinthisfieldfocusonRemotelyOperatedVehicles(ROVs),AutonomousUnderwaterVehicles(AUVs),underwatermanipulators,etc.Fishrobot,whichisanewtypeofunderwaterbiomimeticrobot,hasattractedgreatattentionbecauseofitssilenceinmovingandenergyefficiencycomparedtoconventionalpropeller-orientedpropulsivemechanism.However,mostofresearchesonfishrobotshavebeencarriedoutviaempiricalorexperimentalapproaches,notbasedondynamicoptimality.Inthispaper,weproposedananalyticaloptimizationapproachwhichcanguaranteethemaximumpropulsivevelocityoffishrobotinthegivenparametricconditions.First,adynamicmodelof3-joint(4links)carangiformfishrobotisderived,usingwhichtheinfluencesofparametersofinputtorquefunctions,suchasamplitude,frequencyandphasedifference,onitsvelocityareinvestigatedbysimulation.Second,themaximumvelocityofthefishrobotisoptimizedbycombiningGeneticAlgorithm(GA)andHillClimbingAlgorithm(HCA).GAisusedtogeneratetheinitialoptimalparametersoftheinputfunctionsofthesystem.Then,theparametersareoptimizedagainbyHCAtoensurethatthefinalsetofparametersisthe"near"globaloptimization.Finally,bothsimulationsandprimitiveexperimentsarecarriedouttoprovethefeasibilityoftheproposedmethod.

  • 标签: FISH ROBOT carangiform VELOCITY OPTIMIZATION propulsive