乔治·欧根·乌仑贝克

乔治·乌仑贝克(Georege Uhlenbeck),逝世于1988年10月31日;他主要是以电子自旋概念的创始人之一而闻名于世的.这一概念是他与古兹米特(S.A.Goud-smit)密切合作的成果;这一合作曾得到他们在莱顿大学(荷兰)的老师保罗·埃伦菲斯特(Paul Ehrenfest)的鼓励和促进。乌仑贝克和古兹米特的这一概念是     

Investigation on Bending and Creasing of Woven Fabrics under Low Curvature

Under the assumption of semi - circular form for a fabric bend, creasing of fabric strips and compression of fabric loops are analyzed by neglecting the structural complexity of the fabric. The relationship between the creasing force and deformation are deduced using an energy method and solutions are given for a linearly elastic material with constant internal frictional constraint. The agreements between the theoretical predictions and experimental results are very satisfactory.     

在核物理中检验規范理论

本文是希腊爱奥尼纳大学物理系的维加多斯(J.D.Vergados)教授,从欧洲巴尔干半岛投寄本刊的稿件。文章认为,核物理对检验物理学前沿的许多概念能起非常重要的作用。     

Blind source separation of ship-radiated noise based on generalized Gaussian model

1 .INTRODUCTIONBlind source separation (BSS) in signal processinghas received considerable attention from many re-searchers .It is a fundamental problem in signalprocessing with a large number of extremely di-verse applications such as multi-user communica-tions ,speech signal processing, array processingand medical signal processing including ECG,MEGand EEG. The general goal of blind sourceseparation (BSS) is to separate the statistically in-dependent , unknown source signals from t…     

乘超级电梯上太空

上天揽月,再出发到火星,只要乘上超级电梯。这电梯怎么建?安在哪儿?动力从哪里来?……现在开始研究,没准未来太空梯最牛的设计师就是你!     

Distribution of possible sunshine durations over rugged terrains of China

Theconcepton possiblesunshineduration(PSD)findsitswiderangeofapplicationsinagricul ture ,forestry ,meteorology ,hydrology ,remotesens ing ,buildingindustryandsolarenergyutilization[1] .Itis ,however,hardtodeterminethePSDinapar ticularruggedterrainonaccountofitsslopeandas pect ,aswellasthescreeningofelevatedsurroundinglands[2 ] .PSDhastodateremainedanessentialyetunknowngeographicparameteronanation wideba sis ,especiallyinmountains[3] .PSDrefersbothtoitsastronomicalanalog ,meaningamaximum po…     

关注癌细胞转移之谜?

对于癌症患者来说 ,医生的诊断结果可能是毁灭性的 ,肿瘤仅仅是这一过程的开始 ,更危险的是癌细胞的转移     

新加速剂

我的好友吉本教授致力于研究药物对神经系统的作用:“我想得到一种药物,人们服用后活动节奏提高两倍、三倍。想一下它带来的结果!假如你是一位陷于困境的政治家,急于完成某件重要事情;或者是一位医生在挽救病危者;或是一位强记应考的学生;或是在决斗中,那时一切取决扣扳机的速度……”“这种药物当然有用,你能发明它吗?”他意味深长地对我笑笑:“我嘛……已经有些眉目啦。”几天后他告诉我,新型加速剂已成为实实在在的东西。那天他匆匆从山上寓所走下来,两眼放光,神彩飞扬,脚步分外有力。“成了,”他一把攥住我的手急切地说,“非常成功!难以置信!”