Studies on Structure and Porperties of Water Soluble Polysaccharide from Fruiting Body of Cordyceps Militarvs(L.) Link

A water soluble crude polysaccharide has been isolated from the fruiting body of cultivated Cordyceps militarvs(L.)Link.The GC analysis indicated that it contained the monosaccharides of Gal,Man,Glc and GlcA.Their molar ratio is 1.00:1.58:7.89:0.19.The crude polysaccharide was fractionated with ethanol to get three fractions,which were CM-Ⅰand CM-Ⅲ,CM-Ⅱ was further purified to get one homogeneous fraction named CMB.The molecular weight was estimated to be 6000by means of gel filtration.CMB is a greyish white powder.The GC analysis indicated that it was composed of Gal.Man,Glc and the molar ratio is 1.00:1.38:5.10.Partial hydrolysis with an acid.periodate oxidation.Smith degradation.IR,GC and methylation analyses,GC/MS analyses were used for the structure analyses of CMB.Man,(1→6)-linked-Glc,(1→4)-linked-Glc and (1→4)-linked-Gal.Some of (1→4) -linked-Glc and all(1→4)-linked-Gal residues are substituted at 3-O and 6-O respectively,(1→4)-linked-Glc and minor(1→6)-linked-Gle.The nonreduced end is composed of Gal and Glc.The main glycosidic link of CMB is α configuration.     

半参数方差误差模型的估计

本文综合近邻权函数法及最小二乘法，用两阶段最小二乘估计的方法得到了半参数EV模型中参数的估计量及其强相合性，渐近正态性。同时也得到了非参数函数的估计量及其强相合性，一致强相合性。     

白炽灯延寿节电开关

运用交流电路中线圈的自感特性，制成一种白炽灯的延寿节电开关，它可消除白炽灯起动瞬间的浪涌电流，延长白炽灯寿命，节约用电。     

Light-Gradient-Induced Spiral Wave Drifts in a Belousov-Zhabotinsky Reaction

The dynamic behaviour of spiral tip in the light-sensitive Belousov-Zhabotinsky reaction under the influence of an externally applied light gradient was experimentally studied. The gradient causes different drifts for different spiral patterns. The centre of the spiral wave moved toward the region of lower light intensity. The direction of an additional perpendicular drift depended on the chirality of the spiral wave. The dependences of the drifting angle and the drifting velocity on light gradient have been measured.     

例说“特殊”情形的特殊价值

存在于数学知识中的“特殊”情形,例如数学知识中一些特殊的存在形式、特殊的表达方式,某些定理或性质存在的一些特殊条件以及解决问题过程中的一些特殊方法等等,在学生的数学学习中都起到了重要的教育作用,不少“特殊”甚至还是理解数学知识,乃至最终解决问题的关键所在.1. 数学认识过程的切入点我们可以看到,在数学学习中,一个概念的产生、某一规律的形成,经常是从一些特殊的情形开始,通过分析、归纳、猜想与演绎等各种方法得到完成的,这是数学重要的思想方法———归纳推理,著名数学家高斯就曾说过,他的许多结论都是依赖归纳法而发现…     

Efficient Visible Electroluminescence from Porous Silicon Diodes Passivated by Carbon Films

By using n-butylamine as a carbon resource,carbon film is deposited on the p-n porous silicon (PS) surface with a radio-frequency glow discharge plasma system.Raman spectra and infrared reflection (IR) spectra of the carbon films indicate that there are amine-group and hydrogen atoms therein.The IR spectra of the passivated PS samples exhibit that the PS surfaces are mainly covered with Si-C,Si-N and Si-O bonds.Electroluminescence (EL) spectra show that the EL intensity of the passivated PS diodes increases greatly and the blueshift of the EL peak occurs compared with the diodes without treatment.Both of these are stable while the passivated diodes are exposed to the air indoors.The I-V characteristics reveal that the passivated diodes have a smaller series resistance and a lower onset voltage.The influence of the carbon film passivation on EL properties of PS has also been discussed.The results have proven that carbon film passivation is a good way to enhance the PS luminescent intensity and stability.     

金属卟啉催化条件下有机化合物与CO2的电羧化反应（Ⅴ）

研究了碘化四－（４－三甲胺基苯基）卟啉钴和ＶＢ１２催化ＣＯ２与卤代丁烷的电合成，该反庆在－１．５Ｖ（ｕｓ，ＳＣＥ）即可发生，ＶＢ１２催化产物为预期的戊酸丁酯，而ＣｏＴＰＰ催化产物为ＣＯ２直接还原的草酸二丁酯，并未发现ＣＯ２与卤代烷的反应产物，初步探讨了产生不同产物的原因。     

具有随机窗宽核估计的一致强相合性

设 X_1,…,X_m i.i.d.是取值于 R~n 中的随机向量,X_1 有概率密度 f(x),取正随机变量 H_m(x,ω)=H_m(x,X_2(ω),…,(ω))为随机窗宽,f(x)的核估计与最近邻估计分别如下:f_m(x)=(mH_m~n(x,ω))~(-1)sum from i=1 to m K((X_i-x)/H_m(x,w))f_m(x)=(ma_m~n(x,w))~(-1) sum from i=1 to m K((X_i-x)/a_m(x,w)),m≥1,x∈R~n.假定 K 为 R~n 中有界变差函数,当 f(x)与 K(x)的条件比[1]弱时,我们讨论了 f_m(x)与 f_m(x)的一致强相合性。本文所得随机窗宽的结果与[1]中常数窗宽的结果相同,这些结果也比[2]和[5]中的要好。     

5,10-二(对-氨基)四苯基卟啉和吖啶黄之间激发能量的传递

利用Forster能量传递机制,研究了氯仿溶液中吖啶黄向5、10-二(对-氨基)四苯基卟啉(简称TBP)的激发能量传递和TBP.浓度变化时对能量传递速度常数的影响.实验结果表明,吖啶黄和TBP之间具备能量共振传递的条件,并且计算了能量共振传递的临界距离为0.42nm、传递效率为0.72和传递速度常数为1.42×107s-1.这些数据对复合膜光电转换器件的设计将具有重要意义.