简介:有alloying原子X=C,B,N,O和空缺的镁和它的合金的概括叠的差错(GSF)精力和表面精力用第一原则的方法被调查了。叠的差错精力上的alloying原子和空缺的占优势的减少效果在slip飞机附近在第一层从他们的位置被结果,这被发现。叠的差错精力是将近与纯镁一样当alloying原子和空缺被放在时第二,第三,第4,第5和第6层。O强烈减少Mg的GSF精力,这被显示出。alloying原子C,B和N增加表面精力,但是O和空缺减少Mg的表面精力。Mg和Mg合金的韧性被使用在表面精力和不稳定的叠差错精力之间的比率基于瑞斯标准讨论了。
简介:摘要B-Lynch缝合是用于治疗产后出血的一种新方法,此法操作简单、迅速、安全有效、易于推广。
简介:摘要目的研究分析B超诊断泌尿系结石的临床效果。方法随机选取我院在2008年3月至2012年2月初诊断为泌尿系结石的住院50例患者,所有患者首先需进行B超的检查,查看是否存在有结石以及结石的部位做出相关的判,并观察对其他相关的项目的检查结果和手术治疗的结果,泌尿系结石患者的符合率是采用分类统计和B超检查对比以及其他检查的方法。结果通过临床的诊治结果得出,70例的出诊患者中60为泌尿系结石,B超的诊断符合率为83.33%,在经过B超的检查符合率对比中,肾结石率为最高,其次为尿道结石与膀胱结石,最低率的为输尿管上段结石。结论在诊断泌尿系结石中,采用B超检查具有便捷、简单以及精确的特征,在泌尿系结石的临床中可优先考虑次方法。
简介:SeismicityoftheEarth(MC4.5)wascompiledfromNEIC,IRISandISCcataloguesandusedtocomputeb-valuebasedonvarioustimewindows.Itisfoundthatcontinuouscyclicb-variationsoccuronbothlongandshorttimescales,thelatterbeingofmuchhighervalueandsometimesinexcessof0.7oftheabsoluteb-value.Thesevariationsoccurnotonlyyearlyormonthly,butalsodaily.Beforetheoccurrenceoflargeearthquakes,b-valuesstartincreasingwithvariablegradientsthatareaffectedbyforeshocks.Insomecases,thegradientisreducedtozeroortoanegativevalueafewdaysbeforetheearthquakeoccurrence.Ingeneral,calculatedb-valuesattainmaxima1daybeforelargeearthquakesandminimasoonaftertheiroccurrence.Bothlinearregressionandmaximumlikelihoodmethodsgivecorrelatable,butvariableresults.Itisfoundthatanexpandingtimewindowtechniquefromafixedstartingpointismoreeffectiveinthestudyofb-variations.Thecalculatedb-variationsforthewholeEarth,itshemispheres,quadrantsandtheepicentralregionsofsomelargeearthquakesareofbothlocalandregionalcharacter,whichmayindicatethatinsuchcases,thegeodynamicprocessesactingwithinacertainregionhaveamuchregionaleffectwithintheEarth.Theb-variationshavelongbeenknowntovarywithanumberoflocalandregionalfactorsincludingtectonicstresses.Theresultsreportedhereindicatethatgeotectonicstressremainsthemostsignificantfactorthatcontrolsb-variations.ItisfoundthatforearthquakeswithMwC7,anincreaseofabout0.20intheb-valueimpliesastressincreasethatwillresultinanearthquakewithamagnitudeoneunithigher.