双倒易边界元拓展于模拟生物组织中热波传播问题

1前言双倒易边界元是一个新发展的纯边界积分数值方法＊，乞今在热波传播问题的应用尚未见到报导。对热波在工程材料中传播的反射和衰减特性已作过一些研究，但它们均局限在快速温度变化及极低温情形．生物组织热波传播问题的研究则尚未见到报导。我们曾用有限差分法考察过一维情况下热波在不同时刻下的演化情况，算例中波形存在锯齿这是由于有限差分误差所致．热波问题的数值模拟，需要对热波及其分解、叠加和反射能进行准确定位与精确捕获。在已发表的有限差分泡括采用了TVD高精度算法）数值解中报道了热波前沿存在严重的数值脉动。边界…     

在复习中应注意发展习题的教学功能

课本上的例题、练习题和复习参考题（以下都记为习题）是数学知识的浓缩，其中有不少的习题具有代表性和典型性，存在着发展其数学功能的可能性．但是这个问题尚未引起我们普遍的注意和足够的重视．因而在高考复习中，习题的地位日趋下降，取而代之的却是一些难题、怪题、偏题等所组成的题海．究其原因，主要是有些学生和教师认为，课本依旧，习题不变，年年如此．不少习题连答案也背得出来，在习题上花费时间，没多大的意义．要真正体现习题的导向作用，关键在于教师能否结合高考的实际对典型的习题发展其数学功能（如习题的数学思想、理论…     

微乳液法制备纳米草酸钆的热解机理的研究

Gd₂O₃∶Tb³⁺ luminescent nanoparticles were prepared by the thermal decomposition of the nanosized oxlate prepared in the reverse microemulsions based on triton X-100 / n-hexyl alcohol, n-octane, and water. From TG-DTA, XRD and FTIR analyses, the mechanism of thermal decomposition of the nanosized oxalate precursor is suggested as follows: Gd₂(C₂O₄)₃·10H₂O → Gd₂(C₂O₄)₃ + 10H₂O, Gd₂(C₂O₄)₃ → Gd₂O₂(CO₃) + 3CO +2CO₂, Gd₂O₂(CO₃) → Gd₂O₃ + CO₂. The kinetic parameters of thermal decomposition reaction-activation energy E of stage 2 and 3 are 194.6 kJ·mol^-1, 110.9 kJ·mol^-1, respectively, using Ozawa method. And the reaction order n is 2.9 and 0.43, respectively, according to the TG curves.     

固相复合抗体放射免疫分析法测定人体SOD的含量

本文描述了固相复合抗体放射免疫分析法测定人血清和红血球中超氧化物歧化酶的含量，该法灵敏度为０．５ｎｇ，非特异为２．０±０．６％，批内误差在３．４％～４．２％（ｎ＝９）之间，批间误差在７．０％～７．５％（ｎ＝６）之间，经测定，人血清正常值为２９１±７９（ｘ±ｓ）ｎｇ／ｍＬ，红血球正常值为８６１±９５（ｘ±ｓ）×１０＾－６Ｈｂ。该法灵敏度高、特异性好，简便，快速，适于分析大量样品。     

大承气颗粒剂中微量元素的溶出量分析

采用原子吸收光谱法测定了大承气颗粒剂中铅、砷、镉、 铬、铜和锌的含量及其在人工胃液和人工肠液中的溶出量。结果表明，大承气颗粒剂中微量重金属元素在人工胃液中的溶出量明显高于人工肠液中，其中铜、 锌的溶出百分率较其它元素高。     

二正丁基锡双(二茂铁硫代甲酸酯)配合物的红外光谱和核磁共振谱

合成了二正丁基锡新型配合物（n-Bu)2Sn(FcCOS)2[Fe=(η-C5H5)Fe(1-5-η-C5H4)-1；研究了该配合物的红外光谱和核磁共振（1H，13C，119Sn)谱，并推测出配合物可能的分子结构。     

2，2，3-三甲基丁烷(C7H16)晶体的成核动力学

High temperature solid phase I of 2,2,3-trimethylbutane(C7H16)(TMB) was investigated by X-ray powder diffraction. The electron diffraction technique for observing the kinetics of phase transitions in the condensed matter has been applied to study the freezing of TMB clusters with diameter of~13nm. Cluster beams were generated from the supersonically expanded TMB vapor with mole fraction of 0.01 in neon carrier gas. The freezing evolution was monitored by electron diffraction in interval of 7-9 μs. Clusters with an average size of ~5,500 molecules were observed to freeze into the solid phase I at a nucleation rate of 3.5 × 1028 m-3•s- 1 at the freezing temperature of clusters, ～170K. The estimated growth rate of postcritical nuclei indicates that the observed nucleation in the present experiment corresponds to mononuclear freezing of the clusters into single crystals of solid phase I.     

纳米材料的结构Ⅰ:四氟化硅纳米粒子的结构(英文)

通过超声膨胀产生了直径约为4．3nm的SiF4纳米粒子，并用电子衍射表征其结构．在选择的射流部分中，粒子大小的分布是很窄的，因而可以用541个分子构成的分子簇进行结构精化．在SiF4的纳米粒子中，分子的堆积可用大块物质的立方晶体结构来模拟.还谈到纳米粒子表面上由于平动和转动运动引起的分子混乱．     

1,10-双(1’-苯基-3’-甲基-5’-氯代吡唑-4’-基)癸二酮-[1,10]对铁(Ⅲ)、钴(Ⅱ)和镍(Ⅱ)的萃取行为

1,10-双(1’-苯基-3’-甲基-5’-氧代吡唑-4’-基)癸二酮-[1,10](以下简称H_2A)是近年来开发的一个新型螯合萃取剂。蒋次清等研究了本文标题化合物的同系物1,9-双(1’-苯基-3’-甲基-5’-氧代吡唑-4’-基)壬二酮-[1,9]对铁(Ⅲ)、钴(Ⅱ)和镍(Ⅱ)的萃取行为,发现它能将铁(Ⅲ)与钴(Ⅱ)和镍(Ⅱ)分离,但不能实现钴(Ⅱ)和镍(Ⅱ)的分离。本文研究表明,当上述化合物的主碳链中C从9个增加到10个后,在适当条件下能实现铁(Ⅲ)、钴(Ⅱ)和锦(Ⅱ)间的相互分离。     

草酸根桥联的双核铜(Ⅱ)配合物[Cu2(phen)2(H2O)2(μ2-C2O4)](NO3)2的合成及晶体结构

A new binuclear copper(Ⅱ) complex, [Cu₂(phen)₂(H₂O)₂(μ₂-C₂O₄)](NO₃)₂, has been synthesized and characterized by elemental analysis, IR and UV-Vis spectrum. Its crystal structure was determined by single crystal X-ray diffraction techniques. Crystal data: monoclinic, space group P2₁/c, a=0.712 21(8) nm, b=1.170 93(14) nm, c=1.783 7(2) nm, β=111.828(2)°, and V=1.380 8(3) nm³, D_c=1.769 Mg·m^-3, Z=2, F(000)=744, R₁=0.025 4, wR₂=0.069 5, Gof=1.077, Δρ=328～-455 e·nm^-3. The complex is packed by one centrosymmetry binuclear copper(Ⅱ) unit, oxalate dianion and NO₃^- anion. In the molecule structure of the title complex, two Cu(Ⅱ) ions are bridged by oxalate dianion and each Cu(Ⅱ) ions coordinates with two nitrogen atoms from 1,10-phenanthroline ligand and one oxygen atom from water to form a five-coordinate distorted square-pyramidal configuration. The hydrogen bonds are observed between coordinated water molecules and NO₃^- anions. The analysis of the crystal structure indicates that the complex has a two-dimensional stacking network structure, which is formed by intramolecular hydrogen bonds, intermolecular hydrogen bonds and stacking effect of aromatic ring. CCDC: 255345.