充实概率统计知识势在必行—对新高中数学教学大纲的一些认识

充实概率统计知识势在必行—对新高中数学教学大纲的一些认识饶汉昌（人民教育出版社１００００９）与《九年义务教育全日制初级中学数学教学大纲》（以下简称《义教大纲》）相衔接的《全日制普通高级中学数学教学大纲（供试验用）》（以下简称《新大纲》）已由国家教委颁...     

催化分光光度法测定油品及催化剂中的痕量钒

1 引言 张改兰、张振辉利用钒(V)在乙酸介质中于100℃下能催化溴酸钾氧化铬蓝黑R褪色,而建立了测定钒的最灵敏的催化分光光度法,其Sandell灵敏度为7.27×10~(-8)μg/cm~2。我们发现ng数量级的钒能在室温下催化上述反应,且共存物质的干扰限大幅度升高,提高了方法的选择性,简化了操作,能满足石油加工工业对分析钒的要求。本文考察了室温下催化反应的条件及12种离子的干扰情况,成功地将该法应用于石油产品及催化剂中痕量钒的测定。测定范围为0.3～6ng/25ml,检测限为0.3ng/25ml。用0.1g样品能检测到3.0ppb钒。     

等厚双层涂层材料受集中力作用的平面问题理论解

界面应力的正确评价是分析薄膜涂层材料力学特性的难题之一。利用镜像点法和Dirichlet等值性原理，本文推导了等厚双层薄膜涂层材料受表面集中力作用的平面问题理论解。该显式理论解是以固定在各镜像点上的局部坐标系下的Goursat应力函数的形式给出的。对应于高阶镜像点的应力函数，可通过递推的方法，从对应于低阶镜像点的应力函数求得，而且也易于计算机编程。随着镜像点阶数的增大，它与界面的距离也越来越大，因而相对应的应力函数对界面应力的影响越来越小。最后的算例表明，只需考虑前面有限个镜像点，便可获得足够精度的解。该理论解可作为格林函数，以求解复杂问题的理论解，也可用作边界元法的基本解，提高数值计算的精度和效率。     

Moessbauer Investigation of the Ferromagnetic Coupling in Copper-Iron Polycyanides

One of the Prussian blue analogs, molecular magnet Cu3^Ⅲ [Fe^Ⅲ (CN)6]2.11.6H2 O, was investigated by Moessbauer spectroscopy. It was found that transition temperature was around Tc = 18.5 K from paramagnetic phase to ferromagnetic phase. The β value of the critical exponent is around 0.338 at magnetic ordering temperature.Therefore, the ferromagnetic coupling interaction of Cu-Fe cyanide could be clearly explained by spin wave theory.     

新型无油、小体积微球高压充氘氚系统的研制

根据国内激光惯性约束聚变研究对氘氚微球靶的更高要求，新研制了一套能制备15．0MPa氘氚玻璃微球靶系统，结构见图1。     

怎样解动力学问题

动力学问题归根结底是既涉及力的作用，又涉及物体运动过程．解答这类问题，应抓住几个环节．１思路要正确，物理规律要掌握，并注意分析方法．动力学从三种角度研究力的作用效果，即力的瞬时效果，力的时间积累效果，力的空间（位移）积累效果．牛顿运动定律；动量定理和...     

NH_2基态和激发态的SAC－CI和量子拓扑方法研究

ＮＨ_２基态和激发态的ＳＡＣ－ＣＩ和量子拓扑方法研究郑世钧，蔡新华，宋天乐，孟令鹏，中迁博，波田雅彦（河北师范学院化学系，石家庄，０５００９１）（京都大学工程学院京都，日本）关键词ＳＡＣ－ＣＩ方法，激发态，电子密度，拓扑分析用量子拓扑学方法研究激发态...     

方酸染料在远红光区／近红外区对纳米晶二氧化钛电极的高效敏化作用

Four para-dialkylaminophenyl （PDAAP1-PDAAP4） bearing carboxyl groups were studied for application to the dye-sensitized solar cells （DSC）. It was found the short spacer CH2 between carboxyl and dialkylaminophenyl chromophore in PDAAP3 and PDAAP4 led to highly efficient monochromatic incident photon-to-current conversion efficiencies （IPCE）, however the long alkyl group C4H9 attached on aniline moieties in PDAAP2 and PDAAP4 favored improvement of open-circuit photovoltage. Thus, the solar cell sensitized by PDAAP4, having both short carboxyl groups CH2COOH and long alkyl groups C4H9, exhibited the IPCE maximum of 73% at 670 nm and overall energy conversion efficiency η of 3.06%, representing the highest IPCE and η values so far in dialkylaminophenyl-based organic dye-sensitized semiconductor solar cells. Taking advantage of the highly efficient sensitizing ability of PDAAP4 in far-red region, the data of IPCE above 630 nm of the solar cells were improved greatly by cosensitization with both N3 and PDAAP4. The influences of the TiO2 film thickness and the concentration of 4-tert-butylpyridine （TBP） in electrolyte were also investigated.