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排序方式: 共有417条查询结果,搜索用时 156 毫秒
281.
运用JX-2试剂对白色医用胶带和黑色电工胶带粘面汗潜手印进行显现试验表明,当JX-2试剂组分的最佳浓度(水平)为:JX-2荧光染料浓度为1%、饱和CSN溶液最佳用量为2mL、5%I2溶液最佳用量为20滴、异丁醇最佳用量为10滴,对白色医用胶带和黑色电工胶带粘面汗潜手印的显现效果最好。 相似文献
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国增荣 《铁道警官高等专科学校学报》2005,15(1):80-82
近几年来指纹自动识别系统迅速在全国推广应用,并在实际工作中发挥了明显的破案效益.如何使基层的指纹远程比对工作站发挥作用,为铁路公安日常工作增添新的活力,并和查堵追逃等工作紧密结合起来,提高查堵追逃工作的水平和效率,这是新形势下我们铁路公安刑事技术部门面临的重大课题,也是必须认真思考的迫切问题. 相似文献
286.
Kopka J Leder M Jaureguiberry SM Brem G Boselli GO 《Journal of forensic sciences》2011,56(5):1235-1240
Abstract: Obtaining complete short tandem repeat (STR) profiles from fingerprints containing minimal amounts of DNA, using standard extraction techniques, can be difficult. The aim of this study was to evaluate a new kit, Fingerprint DNA Finder (FDF Kit), recently launched for the extraction of DNA and STR profiling from fingerprints placed on a special device known as Self‐Adhesive Security Seal Sticker® and other latent fingerprints on forensic evidentiary material like metallic guns. The DNA extraction system is based on a reversal of the silica principle, and all the potential inhibiting substances are retained on the surface of a special adsorbent, while nucleic acids are not bound and remain in solution dramatically improving DNA recovery. DNA yield was quite variable among the samples tested, rendering in most of the cases (>90%) complete STR profiles, free of PCR inhibitors, and devoid of artifacts. Even samples with DNA amount below 100 pg could be successfully analyzed. 相似文献
287.
Bond JW 《Journal of forensic sciences》2011,56(5):1285-1288
Abstract: The reflection of visible light from α‐phase brass subject to surface oxidation in air at elevated temperatures is investigated. X‐ray photoelectron and auger electron spectroscopy confirm that covered areas of brass (not exposed to air) display dezincification but an absence of significant surface oxidation, confirming a differential oxidation mechanism. Visualization of differential oxidation is shown to be enhanced by selective digital mapping of colors reflected from the surface of the brass using Adobe® Photoshop®. Enhancement is optimal when the brass is heated to ~250°C with areas of oxidation having a mirror‐like appearance. The use of this enhancement method to produce a faithful image of fingerprint ridge characteristics is demonstrated on brass shell casings where fingerprints were deposited prefiring. 相似文献
288.
The effect of electrostatic fingerprint visualization on integrated ballistic identification systems
Visualization of fingerprint corrosion on spent brass cartridge cases by the application of a high electrical potential and conducting carbon powder is becoming an accepted method of fingerprint enhancement. However, to date, no examination has been made of any effect this technique has on ballistic identification. To resolve this, images of the breech face and firing pin marks were captured on six plated nickel and six brass primer cup spent cartridge cases. Three nickel and three brass cases were then subjected to the application of a potential of +2500 V for a period of 1 min. The remaining cases were additionally subjected to the application of carbon powder. These latter cases were then washed to remove all traces of powder. Each case was recaptured with the same ballistic identification apparatus and imaging procedure. None of the twelve cases showed any visual difference after the application of the potential or conducting powder. 相似文献
289.
In this paper, we use bloodstains to illustrate an approach for identifying latent evidence on dark cloth using near infrared (NIR) photography combined with high dynamic range (HDR) photography techniques. NIR photography alone has been used to capture latent evidence that cannot be seen in normal ambient light. HDR techniques combine multiple bracketed photographs of the same image to increase the dynamic range of the photograph which can provide greater contrast. Using NIR photography alone, we were able to detect a bloodstain up to a 1/16 dilution, an improvement over previous studies. Combining NIR photography with the HDR process resulted in a noticeable increase in visibility up to 1/16 dilution when compared to NIR photographs alone. At 1/32 dilution, we were able to detect bloodstains that were not visible using NIR alone. NIR is a useful tool for imaging latent evidence, and combining NIR with HDR consistently provides better results over NIR alone. 相似文献
290.
河北省猪繁殖与呼吸综合征病毒隐性感染情况的调查 总被引:1,自引:0,他引:1
为了解河北省猪繁殖与呼吸综合征病毒(PRRSV)的隐性感染情况,采用RT-PCR方法对2006-2009年采自全省11个地市228个县级屠宰场1 565份商品猪的肺或肺门淋巴结样品进行了PRRSV病原学检测。结果显示,PRRSV场总体阳性率为45.18%;高致病性猪繁殖与呼吸综合征病毒(HP-PRRSV)样品总阳性检出率为12.08%,这4年样品的阳性检出率分别为28.45%、40.74%、12.01%和7.31%;经典猪繁殖与呼吸综合征病毒(C-PRRSV)样品总阳性检出率为2.36%,这4年样品的阳性检出率分别为3.45%、3.70%、3.92%和1.46%。PRRSV同猪瘟病毒、猪伪狂犬病病毒和猪圆环病毒2型混合感染所占的比率为59.73%,HP-PRRSV和C-PRRSV同其他病原体混合感染所占的比率分别为57.67%和43.24%,混合感染以二重或三重感染为主。在同一份样品中不能同时检测到HP-PRRSV和C-PRRSV。总之,PRRSV,尤其是HP-PRRSV在河北省猪群中隐性感染的现象普遍存在,值得高度重视。 相似文献