利用多波段光源提取表面凹凸类客体上指纹再研究

在犯罪现场,案犯在表面凹凸类客体上留下指纹比较常见,如何完整有效地提取该类客体上的指纹,日显重要。利用多波段光源及3种凹凸不平客体,采用原物照相提取、转印提取、新旧对比提取,是提取该类客体上指纹的有效方法。     

纤维物证检验技术的现状及发展

本文概述了国内外纤维物证的发现、提取和检验方法及研究进展,并针对我国不少地区刑侦部门在现场勘查和物证检验中对纤维物证重视不够等问题,提出我国纤维物证研究应以现场发现方法、综合检验技术研究及数据库建设为主要方向。     

数码电子显微镜鉴别手印和字迹形成顺序

对手印和书写字迹形成顺序的检验,是当前刑事科学技术中的研究热点。文章通过对当前采用一种新颖数码电子显微镜鉴别手印和字迹形成顺序的研究,认为这种检验方法无论是鉴定结果的准确性、检验的宽度、快捷和简便程度都较以往的检验方法有较大的进步,特别是它具有能和电子计算机简单连接、方便信息图像存储的特性,更使数码电子显微镜日益成为鉴定中不可或缺的工具。     

谈灰尘手印的处理与提取

当前,在刑事案件的现场勘验中发现并提取到有价值的常规痕迹物证越发困难,灰尘手印在案发现场中出现概率很高,具有一定的代表性。由于受到承痕体本身材质、颜色等方面条件的限制,以及手印遗留的时间、灰尘加层还是减层等诸多因素的影响,采用相应的方法显现、提取指纹,就显得十分重要了。     

Visualization of latent fingerprints using fluorescence lifetime imaging on paper emitting strong fluorescence

Latent fingerprints were successfully visualized using fluorescence lifetime imaging (FLIM) on paper which emits strong fluorescence with a lifetime close to that of fingerprints and thus from which it is difficult for time-resolved spectroscopy to visualize fingerprints. Latent fingerprint samples on paper were excited using a 450 nm or 532 nm nanosecond pulsed-laser, and time-resolved fluorescence images were obtained at a delay time of 6–16 ns in intervals of 1 ns, to the excitation pulse. The excitation beam was expanded using a lens, and the fluorescence from the fingerprints was captured using an intensified CCD camera. Because of the large fluorescence intensity of the background paper of approximately two to four orders of magnitude larger than that of the fingerprint, the fingerprint was not visualized on each fluorescence image by time-resolved spectroscopy. However, the fingerprint was visualized in a FLIM image constructed using a series of the fluorescence images for the case with the fluorescence intensity of the background paper being four orders of magnitude larger than that of the fingerprint. The difference in fluorescence lifetime in the FLIM image of the visualized fingerprint and background paper was in the order of 0.1 ns, which was an order of magnitude smaller than the inherent fluorescence lifetime of a few nanoseconds for the fingerprints and paper. It was demonstrated that, at a background fluorescence intensity with a certain order of magnitude larger than that of fingerprints, FLIM has the potential to visualize latent fingerprints which cannot be visualized by time-resolved spectroscopy.     

Development of Latent Fingerprints on Thermal Paper by the Controlled Application of Heat

Apparatus to produce a spatially and temporally uniform heat source is described and this is used to visualize latent fingerprints deposited onto thermal paper by raising the temperature of the paper. Results show an improvement over previous research when fingerprint deposits are aged or the developed fingerprints faint; visualization being enhanced by the use of a blue LED light source of 465 nm peak wavelength. An investigation of the components in fingerprint sweat likely to affect the solubility and hence color change of the dye present in the thermal paper has shown that polar protic solvents able to donate a proton are favored and a polar amino acid found commonly in eccrine fingerprint sweat (lysine) has been shown able to produce the desired color change. Aged fingerprint deposits on thermal paper from a variety of sources up to 4 years old have been visualized with this technique.     

利用Q-TOFLC/MS建立二级谱图数据库快速检测90种农药的初步研究

目的建立90种农药的数据库（含二级谱图）,以达到快速筛选检验该范围内的未知样品目的。方法优化一种Q-TOF LC/MS分析条件,将90种农药分别依次进行Q-TOF LC/MS-MS二级谱图分析,利用PCDL软件建立数据库。并同时实验了血样中10种不同浓度农药（100ng/mL、500ng/mL）的添加实验,对建库方法进行了验证。结果阳性识别率在80%以上。结论本方法简便灵敏、快速实用。     

纳米材料在潜指纹显现中的应用

本文综述了纳米材料以均匀分散的液体或粉末形式在法庭科学潜指纹显现领域的研究现状,重点阐述了金属纳米材料、金属氧化物纳米材料及半导体纳米材料显现多种遗留客体上不同状况的潜指纹,并对纳米材料在法庭科学领域的应用前景进行了展望。     

京尼平与茚三酮显现手印方法的比较研究

目的对京尼平与茚三酮两种手印显现方法进行综合评价。方法用两种方法显现不同遗留客体上不同遗留时间的手印,并对显现效果、显出手印的稳定性及纸张字迹油墨扩散等现象进行考察。结果京尼平与茚三酮有着相似的的显现原理、适用范围和熏显条件,但在显现效果、显出手印稳定性、试剂成本和安全性能方面存在差异。结论京尼平相比茚三酮方法更安全、绿色环保、显出的手印稳定性更强。     

The Antwerp COR*-database: A unique Flemish source for historical-demographic research

This note describes the origin, the history, structure and characteristics of a recently constructed Flemish (the Northern, Dutch-speaking part of Belgium) historical-demographic database. The so-called Antwerp COR*-database offers a unique combination of features: it spans nearly seven decades (1846 to 1920) and consists of information drawn from the population registers and the vital registration records (birth, marriage, and death) of the whole district of Antwerp. Every person whose family name starts with the letter combination COR* is selected in the database. The database covers three linked generations and contains micro-data on the individual level (life courses), intermediary data on family patterns, and macro-data on ecological characteristics.