对称正交铺层剪切圆柱壳在外压作用下的屈曲和后屈曲

给出了对称正交铺层剪切圆柱壳广义大挠度Ｄｏｎｎｅｌ方程．采用位移型摄动技术构造出计及横向剪切圆柱壳的屈曲和后屈曲渐近级数解,运用奇异摄动技术研究了圆柱壳两端部狭窄区内的边界层效应,并构造了与边界条件匹配的边界层一致有效渐近解．应用获得的当前解计算了在侧向外压作用下三层正交铺设圆柱壳的屈曲载荷并与实验值作了比较,两者十分接近．讨论了Ｂａｔｄｏｒｆ数和初始几何缺陷对圆柱壳屈曲与后屈曲性态的影响．给出的载荷－挠度关系式表明,对称正交铺层剪切圆柱壳的初始后屈曲具有弱稳定分支点．     

多物品的最优拍卖机制

在一般模型下,研究了使卖方期望效用最大化的最优拍卖机制设计问题．考虑了（一个）卖方有多个相同不可分物品的拍卖、投标者的估价相关性以及私有信息的非对称性,给出了多物品最优拍卖的性质,证明了最优拍卖是确定性的,推广了单物品、单需求的拍卖模型．最后给出了最优拍卖的示例,说明了最优拍卖的复杂性．本文的显著特点（不同于其他文献）,就是用新的方法—通过每个投标者得到物品个数的概率来刻划多物品拍卖的机制,从而使分析大为简化．     

经理市场与产品市场

通过对企业激励机制的分析,指出当且仅当不同企业所属的产品市场不存在相关性时,经理市场才没有任何作用;否则,企业总是可以通过产品市场的竞争来促进经理市场的竞争并从中获利．产品市场一个很重要的作用就是提供关于经理能力的额外信息,而提供信息的途径是把不同经理的业绩进行比较,以过滤环境噪声．经理之间的共谋行为将使产品市场的比较失效,应加以制止．产品市场的有效竞争只与产品的相关性有关而与企业的数量无关．     

快速淬冷自动测试实验台的研制

介绍了一种新型高速淬冷装置的设计原理和研制,该测试台可以实现弹射速度的无级调节和沉浸速度准确测量,将其运用于研究球状小样品在液氮（ＬＮ２）中的超快速冷却,可实现较高的沉浸速度和冷却速度,发现随着样品直径的减小、液氮过冷度的增大,沸腾的最大热流密度和最大冷却速度急剧增大。     

用灰色关联分析影响转杯纺纱品质指标的因素

采用棉纤维的 Ｈ Ｖ Ｉ指标,应用灰色关联分析法指出在棉纤维的各项 Ｈ Ｖ Ｉ指标中,纤维强力是与转杯纱的品质指标密切相关的,用高强力、低马克隆值的原棉可以获得高品质指标的转杯纱。     

Anisotropic plastic deformation behavior of as-extruded ZK60 magnesium alloy at room temperature

The anisotropic plastic deformation behavior of as-extruded ZK60 magnesium alloy at room temperature(RT)was investigated by compressive and tensile testing in different directions,i.e.the loading axis oriented at 0°,45°and 90°to the extrusion direction.The relationship between texture and plastic deformation behavior were examined.The results show that the extruded ZK60 alloy exhibits a strong ring fiber texture.The mechanical properties are strongly orientation dependent.In tension testing,the 0°specimen exhibited higher yield strength and lower elongation.In compression testing,however,ZK60 alloy exhibited almost the same yield strength in three directions.The anisotropic plastic deformation behavior is due to strong fiber texture and the lower symmetry of the hexagonal close packed(hcp)structure of ZK60 alloy. The correlation between texture and mechanical behaviour offers the possibility to improve the mechanical properties of magnesium alloy by optimization of the material production process.     

Synthesis and Characterization of Quaternary Complexes Ln(CH_2ClCOO)_2 (NO_3) (phen)

Many binary lanthanide complexes have been studied. However, few mixed anion complexes with bidentate heterocyclic amines were synthesized. We synthesized mixed anion complexes Ln ( CH2 ClCOO )2 (NO3 ) ( phen) which was determined by elemental analyses . The IR spectra analyses indicate that NO3- , CH2 ClCOO- and phen are coordinated with Ln . The molar conductances of the complexes at 10-3 mol · L-1 were founded to be between 32.4 and 35.8 S·cm2· mol-1 , suggesting the nonelectrolytes in N-Dimethylformamide. And we determined the fluorescent spectra Eu(CH2ClCOO)2(NO3) ( phen ) and ESR spectra of Gd ( CH2 ClCOO )2 ( NO3) ( phen) .     

Skin Sensitive Difference of Human Body Sections under Clothing — Comparative Judging of Body Sections'''' Cold Sensitivity Sequence

Intheserialreports[1,2]ofskincoldsensitivedifference ofhumanbodysectionsunderclothing,thepatternofskin temperature smaximumchangesanddynamicchanging processonhumanbodysectionsstimulatedbythesame intensivecoldunderclothingisreported.Atthesame time,bodysectionsaffectedbythesamecoldstimulus resultsinwearers psychologicalperceptiondifference,whichcouldberesearchedintheaspectofsenseand consciousness.Traditionally,senseandconsciousnessbelongto psychologycategory.Tostudysenseandconsciousnessrelated t…     

AN/VAc/MAS序列结构的表征

研究了用红外光谱法分析 AN/VAc/MAS的共聚物组成及序列分布,比较了 AN/VAc与 AN/MA共聚物质序列分布。研究表明:共聚物中VAC含量低于10％时,大分子主键上VAc-VAc键接的可能性很小,说明了 VAc单元比较均匀地分布在大分子主键上,这对于纤维性能的均一稳定非常有利。第二单体VAc代替MA完全可行。     

Automatic Measurement for Fabric Surface Shapes with Two-Dimen-sional Fourier Transform Profilometry

Two- dimensional Fourier transform profilometry (2 -D FTP) for data acquisition of fabric surface shapes isproposed. Phase unwrapping technique based on digitalweighted filter and reliability mask are employed. Ex-perimentai results of shape measurement for several fab-ric appearances are given. From the measured results, itis shown that this method can make up for not only thedisadvantage of the gray level image analysis which isonly suitable for simple structure and solid - pattern fab-ric, but also the low speed and high cost of laser dotscanning technique.