简介:GeologictimeisfundamentaltotheEarthSciences,andprogressinmanydisciplinesdependscriticallyonourabilitytomeasuretimewithincreasingaccuracyandprecision.Isotopicgeochronologymakesuseofthedecayofradioactivenuclidesasahelptoquantifythehistoriesofrock,minerals,andothermaterials.Bothaccuracyandprecisionofradioisotopicagesare,atpresent,limitedbythoseofradioactivedecayconstants.Modemmassspectrometerscanmeasureisotoperatioswithaprecisionof10-4orbetter.Ontheotherhand,theuncertaintiesassociatedwithdirecthalf-lifedeterminationsare,inmostcases,stillatthepercentlevel.ThepresentshortnotebrieflysummarizesprogressandproblemsthathavebeenencounteredduringtheWorkingGroup'sactivity.
简介:Experimental Study of Decay of Hot NucleiExperimentalStudyofDecayofHotNuclei¥WangSufang;TanJilian;SongMingtao;ZhangChong;HeZh...
简介:OfconcernisaviscoelasticbeammodelledusingtheTimoshenkotheory.Itiswell-knownthatthesystemisexponentiallystableifthekernelinthememorytermissub-exponential.Thatis,iftheproductofthekernelwithanexponentialfunctionisasummablefunction.Inthisarticleweaddressthequestions:Whatifthekernelistestedagainstadifferentfunction(sayGamma)otherthantheexponentialfunction?Wouldtherestillbestability?Intheaffirmative,whatkindofdecayrateweget?Itisprovedthatforanon-decreasingfunction'Gamma'whose'logarithmicderivative'isdecreasingtozerowehaveadecayoforderGammatosomepowerandinthecaseitdecreasestoadifferentvaluethanzerothenthedecayisexponential.
简介:Theβ-decaysofneutron-richcarbon,nitrogenandfluorineisotopeshavebeensys-tematicallystudiedusingtheOXBASHshellModel.Inthepsd,spsdandspsdpfmodelspace,weusetheWBPinteractiontocalculatethehalf-livesandneutronemissionprobabilitiesofneutron-richcarbonandnitrogenisotopes,respectively.WiththeUSD(W)andCWinteractions,wecalculatethehalf-livesandneutronemissionprobabilitiesofneutron-richfluorineisotopeinthesdmodelspace,respectively.Thecalculatedhalf-livesandneutronemissionprobabilitiesrepro-ducerecentexperimentaldataverywell.Itseemstoshowthattheparticlesoftheneutron-richcarbonandnitrogenisotopesaremainlyexcitedinthespsdspace.Theβ-decayof21Ntotheneutronboundstatesin21Oismostlythefirstforbiddentransitionwhichmakestheneutronemissionprobabilityincrease.Thetheoreticalcalculationofβ-decayof25Fto25NewithCWinteractionshowsthatCWinteractionisbetterthanUSDinteraction.
简介:Wesystematicallyanalyzetheexperimentaldataofalphadecayineven-evenheavynucleifarfromstabilityandfindthattheGeiger-Nuttalllawbrea~sforanisotopicchainwhenitsneutronnumberisacrossamarcnumberorthereisadeformedsubshell.Thisbreakcanbeusedtoidentifynewmagicnumbersofsuperheavynuclei.Itisalsodiscoveredthatthereisanewlinearrelationbetweenthelogarithmofhalf-lifeandthereciprocalofthesquarerootofdecayenergyforN=126andN=152isotones.Itcouldbeanewlawofalphadecayfornucleiwithmagicneutronnumbersbutthephysicsbehinditistobeexplored.Thesignificanceoftheseresearchesforthesearchofnewelementsisdiscussed.
简介:客观:等待的病人预定设计一个软件在平淡的内部放射性核种照耀治疗自动地做复杂、多重的计算避免错误并且弄短。方法:软件在MicrosoftWindowsXP操作系统上被设计。可视化Basic5.0和微软存取2000分别地被用作这里的程序语言和数据库系统。数据和DBGrid控制和可视化Basic的VB数据窗户指南习惯于的控制存取和存取数据库。结果:任何放射性核种的放射性能不仅是计算的,而且为甲状腺机能亢进或甲状腺癌症和总数的治疗的管理的全部的碘剂量为恶意的肿瘤的骨头转移的补救管理153个Sm-EDTMP答案能在外面是ciphered。结论:当软件能自动地做复杂、多重的计算时,工作变得更容易、更快、更正确、有趣。病人的信息,诊断和治疗能为进一步的学习被记录。
简介:Ateachandeverymomentthethingsofouruniversearesubjecttochange.Thehumanbodytoo,fromtheverymomentitisborn,beginstheprocessthatwillultimatelyleadtodeath.
简介:属于超重元素的腐烂链的原子核的性质295118在有参数的使变形的相对论的吝啬的领域(RMF)理论在堵住的英国计算机学会近似NL-Z2设置了的向轴的方向的框架被学习了。象有约束力的精力,变丑,和腐烂精力Q那样的一些扎根的州的性质从有限范围的微滴模型(FRDM)与那些被获得了并且同意很好。在壳豁开的295118腐烂链表演的原子核的单个粒子的系列显然介绍核子数字依赖。分布从279110~283112从283112~295118,但是戏剧性地慢慢地改变的质子,中子和物质的root-mean-square(rms)半径,它可能由于在Z=的支壳层闭合110在279110。在295118腐烂链的腐烂一半生活被雇用簇模特儿和概括液体落下模型(GLDM)评估,并且当他们与已知的试验性的数据相比时,全面协议被发现。从簇模型获得的腐烂一生比GLDM的那些稍微大。最后,我们预言Z=的腐烂一半生活118,116,114,用簇模型和GLDM的112同位素,它也显示这二个模型能在超重原子核上在研究互相支持。从GLDM的结果总是比从簇模型获得的那些低。
简介:BlocksofMosobamboowereusedasexperimentalmaterialstotestthetoxicityofCuAzpreservativeondecayfungibythelabtestinthispaper.Theresultshowedthatthenaturaldecayresistanceof4-year-oldMaobambooismoderate,andtheresistancetobrownfungiisstrongerthanthattowhitefungi.Theanti-fungipropertiesofCuAzpreservativeattheretentionof3.3kg/m3areequaltothoseofCCA-CandACQ-Battheretentionofabout4.0kg/m3,andobviouslysuperiortothoseoforganicacidspr...
简介:Inthispaper,wepayattentiontothetime-decayrateoftheviscousbipolarquantumhydrodynamic(QHD)modelsforsemiconductors.Byapplyingtheentropymethod,weprovethatthesolutionoftheviscousbipolarQHDmodelstendstotheequilibriumstateatanexponentialdecayrateforthemulti-dimensionalcases.Theargumentsisbasedonaseriesofaprioriestimates.
简介:在上面提到的由消费明星做的那些广告中,明星做广告,由消费明星把消费伦理宣扬得赤裸裸的莫过于王志文做的"派"牌服装广告
简介:在上面提到的由消费明星做的那些广告中,明星做广告,由消费明星把消费伦理宣扬得赤裸裸的莫过于王志文做的"派"牌服装广告