大鼠尸僵发展过程中肌节长度的变化及其长度测定

目的观察大鼠尸僵发展过程中肌节形态、肌节长度的变化。方法 2 1只大鼠分为 3组 ,每组大鼠分别于死后立即和死后 2h、 4h、 6h、 8h、 12h、 2 4h取材 ,扫描电镜下观察大鼠死后不同时间的肌节形态 ,同时测定肌节长度。结果死后立即取材标本肌原纤维松散 ,纤维间有一定的间隙 ;死后 2h ,肌原纤维间界限模糊 ,出现周期性横纹 ;死后 4h、 6h横纹清晰 ;死后 12h肌原纤维断裂 ,仍可见横纹 ;死后 2 4h肌原纤维断裂、融合。各组大鼠肌节长度与同组立即取材时比较 ,死后 2h、 4h、 6h、 8h均显著变短 (P值均小于 0 0 0 1) ,其中死后 4～ 6h最短 ;死后12h均无显著性差异 (P值均大于 0 0 5 ) ;死后 2 4h ,组 1、组 3无显著性差异 (P值均大于 0 0 5 ) ,组 2差异显著(P值为 0 0 0 7)。结论用扫描电镜测定肌节长度 ,发现肌节长度随尸僵经过时间的延长而发生变化     

测谎技术及其在我国司法实践中的应用

测谎仪的发明和应用,在犯罪侦查史上是一个重大的突破。现在,测谎技术作为一项通用高科技已被世界上50多个国家广泛应用于国防、司法乃至商业等各个领域。实践证明,测谎技求完全是科学可信的,通过测谎可以准确地鉴别有罪和无罪。近年来,测谎技术正快速和大量地进入了我国司法领域,它作为一种行之有效的辅助侦查手段,为公、检、法、司等机关解决众多疑难案件提供了重要的参考依据,并取得显著效果。为了促进和推广这项技术的应用,本文着重对测谎技术的概念和原理及其在我国司法实践中的应用等方面作较详细的阐述。     

尸僵再形成的实验性研究

目的观察尸僵再形成中肌节长度的变化。方法应用扫描电镜测定不同条件下取材的40只大鼠股四头肌肌节长度,判断再僵直的强度。结果死后未破坏的尸僵肌节的长度明显小于尸僵再形成时的长度。结论肌节长度与尸僵强度呈负相关,说明肌节长度可确定尸僵强度,从而为推断死亡时间提供依据。     

环境扫描电镜在法庭科学中的应用

介绍了环境扫描电镜中二次电子成像的原理及在非导电样品、含水含油样品、植物及生物样品中的应用.     

电子政府的网络和信息安全问题思考

电子政府的网络建设和信息安全一直是近年比较热门的话题。政府部门的工作逐步公开了,大部分数据都通过网络流动了,如何保证数据安全和网络系统可靠运行就成了关键。深病毒的影响,大量网络瘫痪,重要信息遭到恶意更改,这些都是电子政府网络信息安全需要解决的问题。本文从如何解决电子政府网络信息安全方面进行多方阐述,提出了一些解决方案。     

国内外液态爆炸物安全检查技术和设备的发展

液态爆炸物具有制造简易、不易识别、威力巨大、易于引爆等特点,这些特点增加了液态爆炸物安全检查的难度。液态爆炸物的安全检查分为探测、防护和处置三个环节。针对探测环节,文章综述了国内外主要使用的液态爆炸物探测技术及其特点,介绍了有代表性的技术产品,探讨了液态爆炸物探测技术的发展趋势,最后,对我国液态爆炸物安全检查行业的技术发展提出了几点建议。     

论测谎工具的历史演变

人类在识别谎言的历史长河中经历了从非科学到科学的漫长过程,而这个过程中用于测谎的工具也经历了从随意到特意、从简单到复杂的发展过程。测谎工具的历史演变记录着测谎技术从不成熟走向成熟的历史轨迹,从简单的测谎装置到测谎仪雏形,然后到机械化测谎仪,进而到计算机化测谎仪。测谎工具的未来发展趋势是多样化的测谎系统。     

刑事诉讼中的图像电子证据初论

在日常生活和刑事诉讼过程中,电子形式的图像证据已经较为常见。对这种与传统的图像证据截然不同的新型证据形态,需要从证据规则、证明过程等角度进行新的探索。图像电子证据的证明能力和证明力的认定,具有鲜明的技术特征,离不开刑事鉴定和法庭科学的支持。更重要的是,它为传统的证据规则和刑事证明理论提供了新鲜而又充满挑战的内容。     

Basic forensic identification of artificial leather for hit-and-run cases

Single fibers retrieved from a victim's garments and adhered to the suspect's automobile have frequently been used to prove the relationship between victim and suspect's automobile. Identification method for single fiber discrimination has already been conducted. But, a case was encountered requiring discrimination of artificial leather fragments retrieved from the victim's bag and fused fibers from the bumper of the suspect's automobile. In this report, basic studies were conducted on identification of artificial leathers and single fibers from leather materials. Fiber morphology was observed using scanning electron microscopy (SEM), color of these leather sheets was evaluated by microspectrophotometry (MSP), the leather components were measured by infrared micro spectrometry (micro-FT-IR) and the inorganic contents were ascertained by micro-X-ray fluorescence spectrometry (micro-XRF). These two methods contribute to other analytical methods too, in the case of utilized single fiber analytical methods. The combination of these techniques showed high potential of discrimination ability in forensic examinations of these artificial leather samples. In regard with smooth surface artificial leather sheet samples, a total of 182 sheets were obtained, including 177 colored sheets directly from 10 of 24 manufacturers in Japan, and five of them were purchased at retail circulation products. Nine samples of suede-like artificial leather were obtained, 6 of them were supplied from 2 manufacturers and 3 sheets were purchased as retailing product. Single fibers from the smooth surface artificial leather sheets showed characteristic for surface markings, and XRF could effectively discriminate between these sheets. The combination of results of micro-FT-IR, color evaluation by MSP and the contained inorganic elements by XRF enabled to discriminate about 92% of 15,576 pairs comparison. Five smooth surface samples form retailing products were discriminated by their chemical composition into four categories, and in addition color information to this result, they were clearly distinguished. Suede-like artificial leather sheets showed characteristic extra-fine fibers on their surface by the observation of SEM imaging, providing high discriminating ability, in regard with suede-like artificial leather sheets were divided into three categories by micro-FT-IR, and the combination of these results and color evaluation information, it was possible to discriminate all the nine suede-like artificial leather sheets examined.