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简介：Itwasrecentlysuggestedthattheperiodicandfractalprecipitaionofcalciumsaltsandproteinsincholesterolgallstonesiscloselyrelatedtotheprocessofstoneformation.Thepresentstudyistomimictheprocessofgallstonegrowthinvitro.Wedemonstrateforthefirsttimethatathree-dimensionalstructureofperiodicrings(Liesegangring)and/orfractalpatternscanbeproducedbymetalionanddeoxycholateprecipitaitonwhicharesimilartogallstones.Precipitationinaperiodicpatternoccursmoreoftenthaninafractalstructure,UsingX-raydiffraction.polarizedlightmicroscope,Fouriertransform-infrared(FT-IR),andextendedX-rayabsorptionfinestructure(EXAFS),westudiedthepatternformationmechanismsofbothtypesofstructure.Theresultsindicatethattherateofnucleationinthecrystalgrowthisacrucialelementofaffectthepatternformation.Thepatternselectionbetweenperiodicandfractaltypedependsonthecrystalgrowthspeedandtherateofnucleation.

简介：PitformationandsurfacemorphologicalevolutioninSi(001)homoepitaxyareinvestigatedbyusingscanningtunnelingmicroscopy.Anti-phaseboundaryisfoundtogiverisetoinitialgenerationofpitsboundbybunchedDBsteps.Theterracesbreakupandarereducedtoacriticalnucleussizewithpitformation.Duetoanisotropickinetics,adownhillbiasdiffusioncurrent,whichislargeralongthedimerrowsthroughthecentreareaoftheterracethanthroughtheareaclosetotheedge,leadstotheprevalenceofpitsboundby{101}facets.Subsequentannealingresultsinashapetransitionfrom{101}-facetedpitstomulti-facetedpits.

简介：观察分析证明一个Mesoscale对流系统(MCS)发生在5月13-日142004沿着在华南的沿海的区域。在西方东方取向以内在西南的流动之中开始的MCS低级砍线。与系统联系了，在它的随后的发展阶段，没有不同旋涡发行量发展了在低级。相反，气旋的流动骚乱被观察在中间对流层。传送对流怎么开始发展并且演变为MCS？与观察分析和数字模拟，这个问题被学习了。高分辨率的MM5模拟证明沿着在西方的华南的沿海的线和附近的山的那地志的集中起一个重要作用开始MCS传送对流。曾经，传送对流发生，由于加热的冷凝作用，在先存在之间的一个合作相互作用当系统继续移动eastward.Compared到一些典型MCS时，中间水平的骚乱和传送对流被创造，它可以极大地在时期期间影响MCS开发发生在南部的中国，它通常伴有区分特征的调查MCS表演的气旋的涡度，开发和进化的向上的开发。在这篇文章，为增强负责的物理机制中间--水平骚乱被讨论，并且在MCS组织上的发展解释中间水平的骚乱的效果的一个观点被建议。

简介：在Ziliujing形成的Daanzhai成员的紧密的石灰石的毛孔结构，侏罗记系统在中央四川盆，中国，对紧密的油的探索和发展复杂却必要。紧密的石灰石的毛孔结构被使用扫描电子学习显微镜学(SEM)，氮吸附，高压的水银侵入，和原子磁性的回声(NMR)。试验性的结果建议毛孔主要是裂缝毛孔和mesopores和macropores贡献毛孔卷和特定的表面。排水量压力，平均毛孔尺寸，和有孔和渗透和罐头的同质系数相互关联被用来评估毛孔结构。完整的毛孔尺寸分发被联合氮吸附和高压的水银侵入获得。我们发现石灰石主要与250nm的直径包含mesopores。T2分发被变换成毛孔尺寸分发，很好匹配完整的毛孔尺寸分发。在T2和毛孔尺寸之间的关系与毛孔结构和罐头遵守一条幂定律和T2相互关联的几何平均数在毛孔结构评估被使用。

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简介：Thestabilizationofγ-aluminiumoxyni-tridespinel(γ-AlON)hasbeeninvestigatedbyadditionofMgO,MgAl2O4,etc.,inreactionprocess.Theresultsindicatedthattherearewidersolidsolutionareasnear,Al2O3-richsideinAlN-Al2O3-MgOternarysystems,ThecontentofstabilizedAlONphaseinsamplesisrelatedtoheatingtemperatures,additives,etc.ThelatticeparametersoftheirAlONphasescouldbewelldescribedbytheequation:a0=0.7900+0.0375[MgO]+0.015[AlN](nm)

简介：AseriesofDy(Gd)-basedbulkamorphousalloyrodswerepreparedbywater-cooledcoppermoldmethod.ThermalstabilityandstructureofDy-Gd-Co-AlalloyswereinvestigatedbydifferentialscanningcalorimetryandX-raydi-raction,respectively.TheresultsshowthattheDy-Gd-Co-Alalloyshavegoodglass-formationability,andtheDy31Gd25Co20Al24alloycanbereadilycastintofullglassyrodsupto5mmindiameter.Theglass-formingabilityofmulticomponentalloyswasgreatlydependentontheirchemicalinteractionandtheequivalentbondparametersamongatomssuchasequivalentelectronegativitydierence,equivalentatomicsizeparameter.TheDy(Gd)-basedbulkamorphousalloyscouldbeexpectedaspotentialfunctionalmaterials.

简介：联合润滑油理论和CFD技术，一个有限元素模型被建立模仿rain-wind-induced颤动(RWIV)。基于Spalart-Allmaras(S-A)骚乱类型，COMSOL软件被采用计算风压力系数和与地点和时间变化的风磨擦系数。为了以不同的风速度验证小河的这个方法，形成和进化的诚实和合理性，被学习并且与存在相比试验性的结果。而且，小河的起始的形成的时间，地点，高度和宽度以不同的风速度被分析，电报倾斜角度和风偏航角度。结果证明上面提及的三个影响因素穿上大效果小河的形成，和影响趋势，范围和度与对方不同。

简介：TheCentralAsianLateMesozoicriftspstem(CALMRS)hasundergonetwostagesofdevelop-ment.TheearlyonespreadallovertheLateJurassicperiodandwasCharactcrizedwiththeformationofvolcano-teetonicstructuresofasubsidencecalderatypeandembryonicriftsvolcanogeneous-terrigenefilling.Volcariitesarerelatedtosubalkalinerbyo

简介：ＴＨＥＳＴＵＤＩＥＳＯＦＲＥＶＥＲＳＡＬＯＮＩＮＨＩＢＩＴＩＮＧＤＮＡＳＹＮＴＨＥＳＩＳＡＮＤＣＬＯＮＡＬＦＯＲＭＡＴＩＯＮＯＦＨＬ－６０ＣＥＬＬＳＷＩＴＨＨＹＰＥＲＴＨＥＲＭＩＡＣｈｅｎＸｉｅｑｕｎ；ＳｈｅｎＳｕｙｕｎ；ＨｕＳｈｅｎｇｈｕｉ；ＷｕＢ...

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简介：这份报纸在Paleogene的Shahejie形成在Dongying消沉在页岩水库上被进行。基于详细核心描述，摇薄节，擦亮的氩离子，扫描电子显微镜学(SEM)分析，CT扫描和碳氧同位素的测试，inter-laminar的形成机制断裂(或缝接)并且他们的发展条件被diagenetic进化特征和水库空间进化特征的全面分析讨论。结果证明在Dongying消沉的把压成薄片的合成模式被把压成薄片的方解石和泥土矿物质的垂直分发统治。形成对照到传统的理解，inter-laminar破裂的发展度低得多。没有框架矿物质，和微缝接是的先存在的很好连接的毛孔或水平过压，在层之间的纯液体不能存在液体移植的有利路径。从inter-laminar破裂起源机制和它的进化的点，所谓的缝接，比那烃代提起了毛孔压力并且导致了平行microfractures的传统的理解是更多建筑群。但是inter-laminar破裂与那有小关系迭合是否被开发或床上用品边界是清楚的。事实上，页岩水库inter-laminar破裂不是严密骨折。他们被先存在控制内部小粒的毛孔(或缝接)或溶解毛孔，散布了碳酸盐薄片边界并且被以后的超级压力连接，溶解和渗出物力量。并且开发条件是埋葬深度(比3000m大)并且Ro值(>0.6%)。它的起源和进化的讨论有重要石油优化水库片断和有利目标区域选择上的地质的意义。

简介：Mantleperidotiteswereearlyexposedatthesea-flooroftheJurassicTethysderivedfromthesubcontinentalmantleoftheEurope-Adriasystem.Duringcontinentalriftingandoceanicspreading,theselithosphericperi-dotiteswerepercolatedviadiffusereactiveporousflowbymeltfractionsproducedbynear-fractionalmeltingoftheupwellingasthenosphere.Ascendingmeltsinter-actedwiththelowerlithosphere,dissolvingpyroxenesandprecipitatingolivine,andcrystallizedatshallowerlevelsinthemantlecolumncausingmeltimpregnation.Subsequentfocusedporousflowformedreplacivedunitechannels,cuttingtheimpregnatedoeridotites,whichwereconduitsforupwardmigrationofMORB-typeliq-uids.Meltmigrationproduceddepletionlrefertilizationandsignificantheatingofthepercolatedlimpregnatedmantle,i.ethethermochemicalerosionofthelitho-sphere.Impregnatedandthermallymodifiedlithos-phericmantlewascooledbyconductiveheatlossdur-ingprogressivelithospherethinningandwasintrudeabyMORBmagmas,whichformedMg-richandFe-richgabbroicdykesandbodies.Alpine-Apennineophioliticperidotitesrecordthedeep-seatedmigrationofmeltswhichchangedtheircompositionsanddynamicsduringtheriftevolution.Thethermochemicalerosionofthelithosphericmantlebytheascendingasthenosphericmelts,whichinducessignificantcompositionalandrhe-ologicalchangesinthelowerlithosphere,isamajorprocessintheevolutionofthecontinent-oceantransi-tiontowardsaslowspreadingoceanicsystem.

简介：Lepingcoal(includingbarkinite-richcoal)isauniquekindofcoal,whichiswidelydistrbutedintheLatePermianLonganFormation,SouthChina,Inthispaper,ROck-Eval,Py-GCandsimulationexperimentviaanopen-systemwereusedtostudythehydrocarbon-generatingpotential,hydrocarboncomposition.andhydrocarbon-generatingmodelofbarkiniterichcoalsfromtheshuichengcoalfieldofGuizhouProvince,SouthwestChina.Theresultsshowthatbarkinite-richcoalshavehighhydrocarbon-generatingpotential,withS1+S2being211-311mg/g,andcanproducelargeamountsofhydrocorbonatthehigh-maturitystage,mostlywithinthetemperaturerangeof420-450℃(correspondingtoVR01.1-1.5%);barkinite-richcoalisoneofthebetteroilsourcesandlighthydrocarbonandwetgasarethemajorhydrocarboncomponents,whichaccountfor45%and33%ofthetotalhydrocarbons.respectively.ThesecharacteristicsareofimportanceforexploringoilandgasresourcesintheLatepermianLongtanFormationcoals,southwestChina.

简介：“Lestagedeformation2005porl'Afriquesurlatechniquedepetitescentraleshydro-electrique”estsubventionnteparleGouvernementChinoisspecialementpourlespaysenvoiededeveloppement,danslecadredel'aideauxpaysenvoiededeveloppement.ChargeparleMinisterechinoisduCommerce,

简介：AbstractBackground:Acute mural dissection of the anterior wall of the internal carotid artery which may contribute to the development of blood blister-like aneurysms (BBLAs) was postulated, and stenting or flow diversion treatment across the soi-disant aneurysm was reported in this study.Methods:From December 2016 to December 2018, 8 patients presenting with subarachnoid hemorrhage (SAH) due to BBLA were subjected to endovascular treatment with stent-assisted coiling. Clinical outcomes were evaluated using a clinical outcome score scale.Results:Based on angiograms, pathologic change involving the supraclinoid segments of the internal carotid artery (ICA) adjacent to BBLA was found in all patients. This pathologic change meant a focal dissection of the supraclinoid segment of the ICA which constituted the pathogenesis of BBLAs. Closed-cell, open-cell, and braided stents were used in 1, 1, and 6 patients, respectively. Complete obliteration was achieved following endovascular treatment among all 8 patients harboring BBLA. One re-bleeding successive to a closed-cell stent across the aneurysmal neck was observed. Follow-up angiograms revealed stable complete exclusion of all BBLAs from the parent vessel at 3 to 8 months. All patients had a favorable clinical outcome score of 0-1.Conclusions:Acute dissection of a focal point of the intracranial vessels underlies the development of BBLAs. Open-cell and braided-cell stent-assisted coiling may constitute appropriate treatment due to good apposition against the vascular walls. Adjunctive coils may facilitate immediate complete occlusion of BBLAs.

简介：GeochemicalanalysisofsandstonesfromtheSardarFormation(fromtwostratigraphicsuccessions)ineast-centralIranwereusedforidentificationofgeochemicalcharacterizationofsandstones,provenanceandtectonicsetting.Sandstonesinthetwolithostratigraphicsuccessionshavesimilarchemicalcompositionssuggestingacommonprovenance.Bulk-rockgeochemistryanalysisofCarboniferoussandstonesfromSardarFormationindicatesthattheyaremainlyquartzdominatedandareclassifiedasquartzarenites,sublitharenitesandsubarkoses,derivedfromacidigneoustointermediateigneousrocks.DiscriminationfunctionanalysisindicatesthatthesandstonesofSardarFormationwerederivedfromquartzosesedimentaryprovenanceinarecycledorogenicsetting.Also,majorandtraceelementsinsandstonesofSardarFormation(e.g.,K2O/Na2Ovs.SiO2)indicatedepositioninastablepassivecontinentalmargin(PM).Chemicalindexofalteration(CIA)fortheserocks(>65%)suggestsamoderatetorelativelyhighdegreeofweatheringinthesourcearea.