简介:随机的地震倒置是geostatistics和从地震记录,井木头,和geostatistics把信息集成到表面下的模型的以后的概率密度功能(PDF)的地震倒置技术的联合。Markov链蒙特卡罗(MCMC)方法被用来取样以后的PDF,表面下的模型特征能被分析推断一套以后的PDF样品。在这份报纸,我们首先介绍随机的地震倒置理论,讨论并且分析四个关键参数:地震数据signal-to-noise比率(S/N),variogram,以后的PDF样品数字,和井密度,并且建议这些参数的最佳选择。分析结果证明地震数据S/N调整在地震数据的影响之间的妥协,倒置上的geostatistics结果,variogram控制倒置结果的光滑,以后的PDF样品数字决定统计特征的可靠性源于样品,并且很好,密度影响倒置无常。最后,在随机的地震倒置之间的比较和确定的模型基于地震倒置显示随机的地震倒置能提供表面下的特性的更可靠的信息。
简介:Inordertoovercomethepoorlocalsearchabilityofgeneticalgorithm,resultinginthebasicgeneticalgorithmistime-consuming,andlowsearchabilityinthelateevolutionary,weusethegraycodinginsteadofbinarycodingatthebeginningofthecoding;weusemulti-pointcrossovertoreplacetheoriginalsingle-pointcrossoveroperation.Finally,theexperimentshowsthattheimprovedgeneticalgorithmnotonlyhasastrongsearchcapability,butalsothestabilityhasbeeneffectivelyimproved.
简介:DriftmarkedChina-Japantiesinmostpartofthe1990s,accompaniedwithwildswings.Thelastdecadeofthe20thcenturywitnessedthecommemorationofthe20thanniversary(1972-1992)ofdiplomaticnormalization,the50thanniversary(1945-1995)ofthevictoryoftheWarofResistanceAgainstJapaneseAggression,thefuroroverthe"NoWardecision"inJapan,andtheshockwavesfromthereorientationofJapan-U.S.relationshipin1996andtherevisionoftheguidelines
简介:AbstractMandibular condylar fractures are among the most common facial fractures and some of the most difficult to manage. Opinions about the management of mandibular condylar fractures differ among surgeons. With the implementation of new technology, an increased understanding of fracture management, and better functional and morphological outcomes reported in the literature, open reduction and internal fixation is becoming many surgeons’ preferred choice for the treatment of condylar fractures. Because surgical treatment of such fractures is complex, certain factors must be considered to achieve satisfactory outcomes. In this article, we summarise six key points in the management of mandibular condylar fractures: virtual evaluation of condylar fracture, a suitable surgical approach, good reduction, stable internal fixation, repair of the articular disc, and restoration of the mandibular arch width. We believe that these points will help to improve the prognosis of mandibular condyle fractures.
简介:Densechromiumsesquioxiderefractorieshavewidelybeenusedinthekilnsformakingalkai-freeandanti-alkaliglassfibersduetotheirexcellentre-sistancetomoltenglasses.Densificationsofchromiumsesquioxideduringsinteringcanbeblockedbyevaporationofchromiumtrioxidederivedfromoxidationathightemperature,Inthispaperthemech-anismofsinteringchromiumoxideandtheprocess-ingtechniqueformakingdensechromiumsesquiox-iderefractoriesarediscussed.Aprocessinlaboratoryscaleformakingdensechromiumsesquioxidebricksisdemonstrated.
简介:IntroductiontoHECHarbinElectricMachineryCompanyLimited(HEC)isapivotalcompanythatproduceslargeelectricmachineryandaccessorialcontrolequipmentinChina.ThehydrounitsmadebyHEChaveaccounted
简介:目的探讨脐带绕颈与剖宫产关系。方法收集脐带绕颈初产妇58例为A组。抽取同期无脐带绕颈初产妇孤例为B组,对两组间分娩方式、胎儿宫内状况、新生儿情况及产程进展进行对比分析。结果阴道分娩率:A组84.5%,B组93.1%;剖宫产率:A组15.5%,B组6.9%;胎儿窘迫发生率:A组24.1%,B组12.1%;三产程平均时间:A组分别为6.6h、47.0min、7.5min,B组为6.7h、36.9min、6.8min。阴道分娩、剖宫产、胎儿窘迫、一三产程两组分析对比,差别无显著性(P>0.05);二产程两组比较差别有显著性(P<0.05)。AB两组无新生儿窒息发生。结论并不是脐带绕颈均会给固产儿带来不良影响,脐带绕颈应首选阴道分娩,而不应成为剖宫产的必然指征。
简介:摘要:胎膜早破,产科临床最常见的产前并发症,在头位分娩中,也是难产的早期提示,因此临床对胎膜早破与头位难产关系密切,现将胎膜早破与头位难产作为临床探讨,以引起产科广大医务工作者的重视,确保母婴安全。