高效液相色谱法鉴别蓝色签字笔墨水的种类

目的通过对签字笔字迹成分进行检验，达到对签字笔成分进行分离并对签字笔种类进行鉴定的目的。方法使用高效液相色谱法对蓝色签字笔字迹色痕中的色料成分进行分析，并依据分析结果对墨水的种类划分，同时考察了纸张的背景影响、最小用样量以及实验结果的重现性。结果22种蓝色签字笔样品均可以实现区分。结论本研究对实际应用有较大参考价值。     

光谱成像检验法在朱墨时序鉴定中的应用

光敏印文色料与签字笔书写色料交叉重叠后,因互溶渗透不易形成层状结构而使判定朱墨时序的难度较大。光谱成像检验法是通过比较交叉点、纯印文色料、纯墨迹色料处的反射曲线位置来判定交叉时序关系。     

签字笔水、圆珠笔油红外发光特性的研究

目的记录不同激发光、接收滤光镜下,各种油墨红外发光强弱的程度,为文字检验提供基础性的研究。方法用多波段光源中510~650nm单色光激发各种油墨样本,全波段物证检验CCD系统记录样本在530~950nm接收滤光镜下出现的红外发光图像。结果多数油墨在接收滤光镜到达800~850nm时,呈现出强烈的红外发光状态,并随接收波段的上升而开始衰减。结论可利用某些油墨的发光与否,发光强与弱的特性,检验案件中涂改和涂抹字迹。     

试谈运笔节奏特征

在笔迹鉴定实务中,运笔特征是较难掌握和运用的一种特征,它既有外在的表象,起笔、行笔和收笔,也有内在的笔压力和抑扬顿挫折变化。作者引入音乐术语——节奏,试图使鉴定人对运笔特征的内含有深层次的理解。运笔节奏特征和其它特征一样也是在长期的书写活动中形成的,具有特定性和稳定性。摹仿者可以做到形似,但要摹仿运笔节奏到“神似”难度就大了,因此,体会并运用运笔节奏特征对摹仿笔迹鉴定是有重要意义的。     

WTO蓝色条款的未来趋势及我国的相关对策

蓝色条款是现今发达国家与发展中国家在世贸组织内争论最激烈的议题之一 ,其主要涉及劳动法基本原则和劳动基本条件两方面的标准 ,现行世界贸易组织规则对劳工问题远未构成有效的纪律约束。未来蓝色条款问题的趋势很有可能成为新一轮多边贸易谈判的焦点问题而进入世贸组织领域。发展中国家解决劳工问题的关键在于团结一致 ,在劳工标准的内容和实施方式上据理力争 ,争取有利于自己的制度安排。中国必须未雨绸缪 ,对此尽早采取各种对策 ,争取在未来的谈判中占据更主动、更有利的地位。     

Application of Micro‐Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy to Ink Examination in Signatures Written with Ballpoint Pen on Questioned Documents

Questioned documents examined in a forensic laboratory sometimes contain signatures written with ballpoint pen inks; these signatures were examined to assess the feasibility of micro‐attenuated total reflectance (ATR) Fourier transform infrared (FTIR) spectroscopy as a forensic tool. Micro‐ATR FTIR spectra for signatures written with 63 ballpoint pens available commercially in Korea were obtained and used to construct an FTIR spectral database. A library‐searching program was utilized to identify the manufacturer, blend, and model of each black ballpoint pen ink based upon their FTIR peak intensities, positions, and patterns in the spectral database. This FTIR technique was also successfully used in determining the sequence of homogeneous line intersections from the crossing lines of two ballpoint pen signatures. We have demonstrated with a set of sample documents that micro‐ATR FTIR is a viable nondestructive analytical method that can be used to identify the origin of the ballpoint pen ink used to mark signatures.     

GC Analysis of Black Gel Pen Ink Stored under Different Conditions

In many criminal and civil cases in China, the most commonly questioned documents are those written with gel pen ink. An important task for forensic document examiners is to identify whether two or more ink entries in one or more documents were written with the same ink type. The identification of the age of gel ink entries made poses an important and difficult problem for forensic document examiners. In this paper, the volatile components of gel ink were determined and the gel ink was classified by gas chromatography with a flame ionization detector. Calibration curves were created to express the relationship between the content of volatile gel ink components and the age of gel ink entries stored under natural and UV‐induced aging conditions. The correspondence between the natural and UV‐induced aging conditions was also established. The experimental results showed that GC was useful in the analysis of black gel ink and applicable for determining the relative age of gel ink entries under certain conditions.     

Determining Line-Crossing Sequences Between Laser Printing and Writing Pen Using Coaxial Light

Determining the application sequence of hand-written pen ink and printer toner lines has attracted significant interest in questioned document examination. This study uses coaxial light to determine line-crossing sequences, with intersections observed under a VSC600 forensic document workstation and a Leica M205A Stereo-microscope. Results show that reflected light at intersections and color contrast between intersections and nonintersections was observed when a hand-written ink line passes over a toner line, while a toner line passing over a written line appeared dull, with no color contrast. The procedure was tested under a range of conditions, such as types of writing pens and laser printers, the writer, and writing pressure, with the latter playing an important role in the evaluation. To validate the results, a 90% detection rate and 98% accuracy rate were achieved from 50 samples of blind testing, which is more effective than optical microscopy.     

群青悬浮液显现手印的研究

目的确定群青小颗粒悬浮液显现手印的最佳配方及适用范围;方法配置群青小颗粒悬浮液的不同浓度,对不同种类手印、不同时间手印以及不同客体上的手印进行试验显现;结果以1‰的1227表面活性剂水溶液为分散剂、浓度为20%的群青悬浮液为最佳配方;结论本研究结果可用于光滑非渗透性客体上遗留时间较短的多种物质手印的显现。     

大鼠机械性损伤后皮下肌肉出血的病理学观察

目的 观察生前机械性损伤后不同时间皮下肌肉出血的病理形态学变化.方法 56只SD大鼠随机分成生前损伤组(48只)、死后损伤组(4只)和正常对照组(4只);生前损伤组按不同时间再分为12组,建立机械性损伤模型;用HE及普鲁干蓝染色法观察皮下肌肉出血的病理形态学变化.结果 HE染色:生前损伤6～24h,损伤区见较多红细胞及...