简介：ＲａｎｄｏｍｆｉｅｌｄｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｅａｒｔｈｑｕａｋｅｏｃｃｕｒｒｅｎｃｅａｎｄｔｅｓｔｏｆｅａｒｔｈｑｕａｋｅｏｃｃｕｒｒｅｎｃｅｒａｔｅＭｅｎｇ－ＴａｎＧＡＯ（高孟潭）（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓｉｃｓ，Ｓｔａｔｅ...

简介：Chinaisnotrichinnaturalforestsources.Owingtonaturalandhistoricalfactors,forestfireshavelongbeenfrequentingChina.Forestfirepreventionisthemostimportantofall.Forestfirepreventionandcontrollinghavelongbeenheldasaveryimportantfactorinourecologicalplans.Takingchina'sspecialgeographicallocation,topography,climateandthedistributionofforestsourcesintoconsideration,wehaveeveryreasontobelievethatforestfiresinChinahavetheirownspecialenv...

简介：Inrecentyears,manyseriousforestfiresoccurredinpreciousPinuspumilaforestsinDaxing'anlingMountainsofHeilongjiangProvinceandInnerMongolia.Butuptonow,thereisstillalackofproperunderstandingoffireoccurrenceenvironmentsinP.pumilaforests.Inpresentpaper,weinvestigatedandstudiedthefireoccurrenceenvironments.TheresultsshowedthatfiresinP.pumilaforestshadtheirownspecialfireenvironments.Abundantfuel,droughtweather,drythunderandhighaltitudeterrai...

简介：ApossiblemechanismisputforwardinthispaperforElNinoeventsfromtheviewpointofplatetec-tonicsandoceanicgeology.Anumberofthedataarecitedtoillustratetheviewsthatsea-bottomvolcanicac-tivitiesandhotspringsmaycauseElNinoevents.

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简介：这篇论文使用地震危险分析方法让中国的城市在Daduhe排水区域在地震出现的概率上研究，在串联水坝系统是located.This的地方，研究基于中国(2001)的地震地面运动参数带状配列地图的潜在的地震来源计划，并且当地震出现model.Earthquake大小服从截断的指数的distribution.The，使用泊松分发潜在的se的空间分发功能

简介：Thisstudyinvestigatedtheoccurrenceanddistributionof15phthalateesters(PAEs)insedimentscollectedfromQixinghewetlands,northeastChina.TotalconcentrationofPAEsinallsedimentsrangedfrom128.41to502.79lgkg-1,withthemeanvalueof284.61lgkg-1.PAEssignificantlydifferedamongwetlandtypes;theaveragePAEsconcentrationofsurfacesedimentswereasfollows:Phragmitesaustraliswetland(PAW,419.87±73.61lgkg-1)[Carexlasiocarpawetland(CLW,304.18±56.47lgkg-1)[Deyeuxiaangustifoliawetland(DAW,129.78±18.24lgkg-1).Dimethylphthalate(DMP),diisobutylphthalate,di-n-butylphthalate,anddi-(2-ethylhexyl)phthalate(DEHP)werefoundinallsediments,DEHPwasthemostabundantPAEscongenerswithconcentrationsvaryingfrom37.62to294.9lgkg-1.DMPandDEHPexhibitedrelativelyhigherconcentrationsinCLWandPAWwetlandsthaninDAW,indicatingthatthedifferentdeoxidizationandbiodegradationconditionscouldhaveimportantimplicationsforthedistributionpatternsofPAEsinwetlandsediments.ThevariationofPAEsconcentrationsinhorizontalandverticalsedimentswithwetlandtypescouldbeattributedtothemigrationofcontaminantsbysurfacewater,groundwaterandatmosphericdeposition.TheoccurrenceanddistributionofPAEsinwetlandsalsosuggeststhatcontaminationinnaturalecosystemsshouldnotbeoverlooked.

简介：Fourcategoriesofglobularproteins,includingall-α,all-β,α+β,andα/βtypes,aresimplifiedastheoff-latticeHNPmodelinvolvingthesecondary-structuralinformationofeachprotein.Thepropensityofthreetypesofresidues,i.e.,H,N,andPtoformasecondarystructureisinvestigatedbasedon146proteinsamples.WefindthatPresiduesareeasytoformα-helices,whereasHresidueshaveahighertendencytoconstructβ-sheets.ThestatisticalanalysisalsoindicatesthattheoccurrenceofPresiduesisinvariablyhigherthanthatofHresidues,whichisindependentofproteincategory.Changesinbond-andnon-bondedpotentialenergiesofallproteinsamplesunderawidetemperaturerangearepresentedbycoarse-grainedmoleculardynamics(MD)simulation.Thesimulationresultsclearlyshowalinearrelationshipbetweenthebond-stretching/bendingpotentialenergyandthereducedtemperature.Thebond-torsionalandnon-bondedpotentialenergiesshowdistincttransitionswithtemperature.Thebond-torsionalenergyincreasestothemaximumandthendecreaseswiththeincreaseoftemperature,whichisoppositetothechangeinnon-bondedpotentialenergy.Thetransitiontemperatureofnon-bondedpotentialenergyisindependentoftheproteincategory,whilethatofbond-torsionalenergyiscloselyrelatedtotheproteinsecondarystructure,i.e.,α-helixorβ-sheet.Thequantitativelybonded-andsemiquantitativelynon-bondedpotentialenergyof24α+βand23α/βproteinsamplesaresuccessfullypredictedaccordingtothestatisticalresultsobtainedfromMDsimulations.

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简介：Amethodofestimationofoccurrenceprobabilityofearthquakeintensityatagivensitefromtheresultsofaten-yearscaleofearthquakepredictiondescribedwithaprobabilityofoccurrenceinagiven"predictioncell"isproposedinthispaper.2316citiesandtownsinChinawereanalyzedbyusingthismethod.TheprobabilityofintensityⅥ-Ⅸweregivenforeverycity.Theseresultscanbeusedfortheearthquakeinsurance,lossestimation,andplanningofdisasterprotection.

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简介：TheoccurrenceandgeologicalgenesisofpyritesinLatePaleozoiccolasofNorthchinahavebeensystematicallystudiedintermsofcoalpetrology,coalchemistry,elementalgeochemistryandsulfurisotopegeochemistry.Theresultssuggestthateighttypesofpyrite,i.e.,framboidal,automorphicgraular,oolitic,massive,homogeneousspherical,allotriomorphic,nodular,joint-andfisure-fillingpyrintescanbesubdividedunderthemicroscope,Fourgenerationsofpyritearealsoreconizedaccordingtotheshape,size,coexistingassemblage,spacialdistributionrelationshipwithmacerals,thecontentsofsulfurandiron.atomicS/Feratiosandassociatedelementsinpryites.SulfurinLatePalozoiccolasofNorthChinaisofdiversesourceasevidencedbysulfurisotopevariationsinthepyrites.Theδ34Svaluesofpyritegeneratedattheearlystagetedtobenegative,andatthelatestage,positive.

简介：Accordingtotheresultsofestimationofthemaximumpotentialearthquakeintheprojectof"TheActiveFaultDetectionandSeismicRiskEvaluation(PhaseII)ofZhengzhouCity",theneareast-westtrendingLaoyachenfaultandShangjiefaultaredevelopedintheurbanarea.TheLaoyachenfaultwasnotactiveintheQuaternary,buttheShangjiefaultmayhavethepotentialofgeneratingM5.0~5.5earthquakes.Inordertogettheprobabilityofoccurrenceofmaximumpotentialearthquakes,wedelineatethestatisticalareasandthepotentialsourceareasandcalculatetheseismicityparametersandthespacedistributionfunctions.OurstudyshowsthattheprobabilityofoccurrenceofanearthquakewithM≥5.0onthefaultsinZhengzhoucityis6%inthenext50yearsand11%inthenext100years.

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简介：这个工作试图在Spodopterafrugiperda(史密斯)的发生上在玉米的叶子学习养分含量的效果(鳞翅目：Noctuidae)并且Dalbulus女仆是(Delong和沃尔科特)(Homoptera：Cicadellidae)。处理被未受精的玉米工厂代表，玉米工厂与明确的表达4-14-8(N-P-K)的250kg使肥沃+硫酸铵的100kg(作为)/ha和明确的表达4-14-8(N-P-K)的500kgAS/ha的+200kg，在使随机化的块约定了四复制。在5的攻击。frugiperda和D。女仆是当在玉米的叶子的氮，硫，钙和铜内容增加了，更高。在这研究发现的钙和铜的效果不与与在文学提及的这些营养素的高水平联系的更低的危险性的一致。我们相信完全有营养素的累积效果，建立接着有为防卫的更少的保守的一棵有营养成份地更好的蔬菜，或在叶子的两营养素的内容不足够高导致如此的效果。

简介：有限信息在在在中央伊朗和另外的中东的国家作为主要土壤父母材料在第三级的沉积上开发的土壤的palygorskite的分发和起源上是可得到的。学习是在土壤决定palygorskite的分发和起源，并且识别在土壤的影响palygorskite分发学习了的主要土壤性质的这的目的在第三级的沉积上发展了。十六土壤侧面发展了在上古新，始新世，渐新世，渐新世中新世，中新世并且上新世沉积被X光检查衍射分析，传播电子显微镜，和扫描电子显微镜学学习。包括粒子尺寸分发，pH，电的传导性，器官的碳，石膏，碳酸盐，和可溶的Si，Ca和Mg的土壤和沉积的物理化学的特征是坚定的。主要部件分析被用来证实在palygorskite和土壤的物理化学的特征之间的关系学习了。结果证明在学习区域的所有土壤的那泥土部分被palygorskite统治。palygorskite的最高的数量在碳酸盐和石膏的同时的累积发生了的地平线被发现。palygorskite的有限数量在撒利族、钙的地平线被发现。Palygorskite似乎具有在所有土壤的表面地平线的eolian起源。当在土壤影响palygorskite的分发和开始的最重要的因素学习了，用主要部件分析，可溶的Mg/Ca比率，pH，可溶的Si和石膏，内容被识别。结果可能从蒸发流动很高的在答案由降水建议palygorskite的neoformation。然而，在在中央伊朗在第三级的沉积上开发的土壤的palygorskite似乎具有继承并且pedogenic起源。

简介：AIM:Toinvestigatethefactorsinfluencingtheoccurrenceofgastricvarioliformlesions(GVLs)andtheirpossiblelinkwithgastriccancer.METHODS:A1:1matchedcase-controlstudywasperformedtoretrospectivelyanalyzedatafrom1638chronicgastritispatientswhohadundergonegastroscopyatoneoftwoChinesehospitalsbetween2009and2014.PatientswithGVLs(cases)werecomparedtothosewithoutsuchlesions(controls).Endoscopicandpathologicalfindingswererecorded,alongwithinterviewinformationonHelicobacterpylori(H.pylori)infection,medical,drugandfamilyhistories,lifestyleandeatinghabits.TheassociationbetweeneachfactorandtheoccurrenceofGVLswasestimated,andthenmultivariateconditionallogisticregressionwasusedtoevaluatetheindependentfactors.RESULTS:Thefrequencyandseverityofglandularatrophy,intestinalmetaplasia(IM)andlow-gradeintraepithelialneoplasiaweresignificantlyincreasedintheGVLgroup(P<0.01).OverallanalysisshowedthatH.pyloriinfection[3.051(2.157,4.317),P<0.001],allergicrespiratorydiseases[3.636(2.183,6.055),P<0.001],work-relatedstress[2.019(1.568,2.600),P<0.001],irregularmeals[2.300(1.462,3.619),P<0.001],highintakeofspicyfood[1.754(1.227,2.507),P=0.002]andhighintakeoffreshfruit[0.231(0.101,0.529),P=0.001]weresignificantlycorrelatedwiththeoccurrenceofGVLs(positively,exceptforthelatter).Stratifiedanalysesindicatedthatpickledfoodconsumptioninpatientsover50yearsold[7.224(2.360,22.115),P=0.001]andexcessivesmokinginmen[2.013(1.282,3.163),P=0.002]werealsopositivelycorrelated,andthat,forantralGVLs,vegetableconsumption[0.491(0.311,0.776),P=0.002]wasnegativelycorrelated.CONCLUSION:SevenriskfactorsandtwoprotectivefactorsaredeterminedforGVLs,whichwerefoundtobeassociatedwithpremalignantabnormalities.

简介：Controlofsupersonicflowfieldswithshockwaveisimportantforsomeindustrialfields.Therearemanystudiesforcontrolofthesupersonicflowfieldsusingactiveorpassivecontrol.Whennon-equilibriumcondensationoccursinasupersonicflowfield,theflowisaffectedbylatentheatreleased.Manystudiesforthecondensationhavebeenconductedandthecharacteristicshavebeenalmostclarified.Further,itwasfoundthatnon-equilibriumcondensationcancontroltheflowfield.Inthesestudies,thecondensationoccursacrossthepassageoftheflowfieldanditcausesthetotalpressurelossintheflowfield.However,localoccurrenceofnon-equilibriumcondensationintheflowfieldmaychangethecharacteristicsoftotalpressurelosscomparedwiththatbythecondensationacrossthepassageofthenozzleandtherearefewforresearchesoflocallyoccurrednon-equilibriumcondensationinsupersonicflowfield.Thepurposeinthepresentstudyistoclarifytheeffectoflocaloccurrenceofnon-equilibriumcondensationonthetransonicflowfieldinanozzlewithacircularbump.Asaresult,localoccurrenceofnon-equilibriumcondensationreducedtheshockstrengthandtotalpressurelossinthetransonicflowfieldbyflowingthemoistairfromtrailingedgeofthecircularbumptothemainstream.

简介：Liriomyzahuidobrensis(Blanchard)是病理的一个重要蔬菜害虫。以便改进Liriomyzahuidobrensis的预言的精确性并且有效地控制Liriomyzahuidobrensis，这份报纸由主要部件分析(PCA)和背繁殖论述一个新预言模型人工的神经网络(BP-ANN)方法。人口出现上的从1999～2007的历史的数据被分析以便发现在害虫出现和气象学的因素之间的一种非线性的关系。然后由使用，分析结果，在在云南的Jianshui的Liriomyzahuidobrensis出现的预言模型被造。新模型成功地申请了在2006验证稻茎borer人口出现。测试结果证明新预言与BP-ANN当模特儿，PCA能改进预言精确性。