Non-invasive detection of superimposed latent fingerprints and inter-ridge trace evidence by infrared spectroscopic imaging

Current latent print and trace evidence collecting technologies are usually invasive and can be destructive to the original deposits. We describe a non-invasive vibrational spectroscopic approach that yields latent fingerprints that are overlaid on top of one another or that may contain trace evidence that needs to be distinguished from the print. Because of the variation in the chemical composition distribution within the fingerprint, we demonstrate that linear unmixing applied to the spectral content of the data can be used to provide images that reveal superimposed fingerprints. In addition, we demonstrate that the chemical composition of the trace evidence located in the region of the print can potentially be identified by its infrared spectrum. Thus, trace evidence found at a crime scene that previously could not be directly related to an individual, now has the potential to be directly related by its presence in the individual-identifying fingerprints. A portion of this work was presented at the 16th Meeting of the International Association of Forensic Sciences, Montpellier, France September 2–7, 2002.     

Phenotypic screening of small molecule libraries by high throughput cell imaging

We have developed high throughput fluorescence cell imaging methods to screen chemical libraries for compounds with effects on diverse aspects of cell physiology. We describe screens for compounds that arrest cells in mitosis, that block cell migration, and that block the secretory pathway. Each of these screens yielded specific inhibitors for research use, and the mitosis screen identified Eg5 as a potential target protein for cancer chemotherapy. Cell imaging provides a large amount of information from primary screening data that can be used to distinguish compounds with different effects on cells, and together with automated analysis, to quantitate compound effects.     

Efficient and Stereospecific Synthesis of (z)-Hex-3-Enedioic Acid,a Key Intermediate for Gly-Gly cis Olefin Isostere

(z)-Hex-3-enedioic acid, a key intermediate in the synthesis of (z)-5-amino-3-pentenoic acid (a Gly-Gly cis olefin isostere), was synthesized by a short and efficient procedure of sequential oxidations. Thus, selective mono epoxidation of 1,4-cyclohexadiene was followed by periodate oxidation to the appropriate dialdehyde. Finally, Jones oxidation of the dialdehyde afforded the corresponding diacid product.     

HL-1装置供电及控制系统调试

本文在介绍供电系统及其主要技术参数和调试概况的基础上,着重分析了电源参数与等离子体参数间的关系,叙述了获得平衡稳定等离子体的调试过程,并对供电回路的退耦方法进行了初步探讨。     

NiFe/Mo多层膜界面的电子显微学研究

用高分辨电子显微学方法研究了Ni₈₀Fe₂₀/Mo磁性多层膜，结果表明：(1)多层膜的结晶状态，随Mo非磁性层厚度而变化.当Mo层厚度为0.7nm时，多层膜基本为非晶；当Mo层厚度大于1.6nm时，Mo层和NiFe层内分别结晶为体心立方和面心立方多晶，层内晶粒尺寸为2—6nm.(2)在Mo层厚度为1.6和2.1nm的多层膜中，NiFe层和Mo层之间存在两种取向关系：(110)_Mo∥(111)_NiFe,［111］_关键词：     

Two testing problems relating the real and complex multivariate normal distributions

The first problem considered is that of testing for the reality of the covariance matrix of a p-dimensional complex normal distribution, while the second is that of testing that a 2p-dimensional real normal distribution has a p-dimensional complex structure. Both problems are reduced by invariance to their maximal invariant statistics, and the null and non-null distributions of these are obtained. Complete classes of unbiased, invariant tests are described for both problems, the locally most powerful invariant tests are obtained, and the admissibility of the likelihood ratio tests is established.     

水体中邻苯二甲酸酯类污染物在HLB柱净化条件优化的研究

采用全因子设计试验对水样中11种邻苯二甲酸酯类污染物在亲水-亲脂平衡介质固相萃取柱上的富集净化效果进行研究, 以邻苯二甲酸酯平均回收率为响应指标, 通过析因分析, 获得主因子及交叉因子效应, 并建立了由显著性因子及交叉因子表达的平均回收率方程. 通过对邻苯二甲酸酯平均回收率的响应曲面分析, 获得最优净化条件. 1.0 μg·L-1添加水平回收率为92% ～102%,50 μg·L-1添加水平回收率为93% ～101%;11种邻苯二甲酸酯的检出限为0.01 ～0.29 mg·L-1;线性范围在0.1 ～100 mg·L-1之间,相关性系数高于0.999 5,方法具有较高的回收率及测定精度.     

纳米碳管的分叉结构

应用催化剂热解碳氢气及热丝CVD两种不同的方法制备了含有分叉结构的纳米碳管,并用透射电镜考察了分叉碳管的形貌及微结构特征.结果表明：分叉结构的形态与制备方法有关,前者沿生长方向的呈规则节突状分布,而后者的分支碳管与未分支的形态类同.纳米碳管分叉结构的形成可能与制备条件的扰动有关,并因此改变其输运特性. 关键词：