简介:Analysisoftheissuecallsforsomequestionsofmethodology.First,thelawofhistoricaldevelopmentteachesthatallcountries,nomatterhowstrongtheymaybe,willeventuallydecline.SothepointisnotwhethertheUnitedStateswillbeanexception,butwhenandhowwillthedayofreckoningdescendontheworld'scurrentsolesuperpower.
简介:Veryrecently,Yu,LeandZhouintroducedthesocalledΔ*B1andΔ*B2conditions,whicharegeneralizationsofthemonotonecondition.Byapplyingthesetwonewconditions,theauthoressentiallygeneralizestheclassicalresultsofChenonthenecessaryandsufficientconditionsoftheLpintegrabilityoftrigonometricseries.Infact,thepresentpapergivesthefirstresultonthenecessaryandsufficientconditionsoftheLpintegrabilityoftrigonometricseries,wherecoefficientsmayhavediffierentsigns.
简介:ChinahasagreatresourceofCannabis.ResearchonthetaxonomyandmorphologyofChineseCannabishasbeencarriedout,butsofarnomoleculargeneticresearchhasbeenpublished.RandomamplifiedpolymorphicDNA(RAPD)isasuitabletechniqueformoleculargeneticresearchonCannabis.Intillsexperiment,usingCannabisherbariumspecimensasasourceofgeneticmaterials,thecorrelativeconditionsofthePolymerasechainreaction(PCR),(i.e.,gradientdensityofMg^2+,dNTPs,TaqDNApolymerase,annealtemperature,annealtimeandreactioncycles)wereexaminedseparately.AneffectiveprocedurefortheRAPDanalysisofCannabiswasobtained.
简介:Radialfunctionshavebecomeausefultoolinnumericalmathematics.Onthespheretheyhavetobeidentifiedwiththezonalfunctions.Weinvestigatezonalpolynomialswithmassconcentrationatthepole,inthesenseoftheirL1-normisattainingtheminimumvalue.Suchpolynomialssatisfyacomplicatedsystemofnonlineare-quations(algebraicifthespacedimensionisodd,only)andalsoasingulardifferentialequationofthirdorder.Theexactorderofdecayoftheminimumvaluewithrespecttothepolynomialdegreeisdetermined.Byourresultswecanprovethatsomenodalsystemsonthesphere,whicharedefinedbyaminimum-property,areprovidingfundamentalmatriceswhicharediagonal-dominantorboundedwithrespecttothe∞-norm,atleast,asthepolynomialdegreetendstoinfinity.
简介:Whenwestudytheinternationalenvironmentthatfacesanationoraregioninaspecificperiod,wehavetoobserveitsstrategicobjectivesfirst.China’sstrategicobjectivesinthefirsttwodecadesofthe21stcenturyare:Tobuildawell-offsocietyinanall-roundway,toachievecompletereunificationofthemotherland,andtosafeguard
简介:摘要:本文介绍材质为904L(00Cr20Ni25Mo4.5Cu)合金烟囱的焊接工艺,通过对904L薄壁设备制作(厚度4/6mm)过程中易产生的焊缝氧化、筒体变形、焊接裂纹等缺陷问题进行讨论分析,针对缺陷和问题制定了预防措施,实施效果良好。
简介:文章摘要:随着国家对海上交通安全管理的不断增强,对海上海难事故抢险救助能力建设不断提出新的、更高的要求。随着国家财力的不断加大投入,交通运输部救捞系统先后有多艘新型8000kw系列救助船舶建成、投入使用,并在海难事故救助中发挥了关键作用,该新型8000kw系列救助船主动力设备是两台由芬兰瓦锡兰制造的W9L-32型主机,该机型主机使用过程中表现的性能良好,故障率很低,但随着使用时间的增长,也出现了各种故障,通过对故障的分析,维修处理结果,对日常维护管理改进,就能避免一些事故发生,从而保护船舶和人员的安全。通过研究分析解决柴油机启动困难的问题,提高救助反应时间,确保救助成功。
简介:目的观察脊柱定点旋转复位手法治疗L_(3-4)椎间盘突出症的临床疗效。方法L_(3-4)椎间盘突出症56例为A组,L4-5及L5-S1椎间盘突出症60例为B组,均采用脊柱定点旋转复位手法治疗,治疗前及治疗结束后用VAS评分,评价治疗效果,并进行统计分析。结果A、B组手法治疗后VAS评分与治疗前VAS评分比较均减小,差异均有统计学意义(P〈0.01);A组与B组相比,手法治疗后的VAS差异无统计学意义(P〉0.05)。结论L_(3-4)椎间盘突出症可以运用脊柱定点旋转复位法手治疗,其临床疗效与L4-5和L5-S1椎间盘突出症相比差异无统计学意义。