C/S、B/S结构相结合的公安院校远程招生系统设计

本文提出了建立基于C/S、B/S体系结构相结合的公安院校远程招生系统,给出了总体设计方案,包括系统结构、系统模块功能和数据库表结构,提出了系统设计的原则,介绍了系统所采用的软件平台和所使用的基本技术。     

短波紫外反射照相显现曲面客体上的潜在指印

目的：针对公安实践工作中经常遇到的问题，利用短波紫外反射照相提取曲面客体上的潜在指印，为曲面客体上的指印提取提供技术参考。方法：利用环形短波紫外灯小角度照射曲面客体，通过固定曲面客体使之仅沿中心轴线方向旋转，依次拍照记录，再导入Photoshop cc中通过图像拼接技术获得完整的指纹图片。结果：总结相机参数设置、曲面客体所产生的反射光斑以及曲面畸变对成像结果的影响，得出一套优化的拍摄方案。结论：曲率对拍摄难度、拼接难度、成像结果有着直接的影响，曲率越大，需要拍摄的照片数量越多，光斑遗留痕迹越严重，成像结果越差。     

粘有纸张的胶带剥离同时显现胶黏面指纹

为了更好地解决粘贴在普通A4纸上的胶带剥离与胶粘面指纹同时显现问题,本文对不同剥离试剂的剥离效果、不同显现试剂的显现效果以及不同胶粘面汗潜指纹遗留时间的影响进行了比较。实验结果表明,丙酮与无水乙醇按照1:10混合而成的试剂剥离效果最好;聚乙二醇和上海牌214型碳素墨水按照1:15混合而成的试剂显现效果最好;遗留5-7天的胶粘面汗潜指纹经染色2次后显现效果最佳,10-20天的实验样本经染色3次后显现效果最佳。     

502胶控制湿度贴显法显现皮革面上手印

目的　研究皮革面上汗潜手印的显现。方法　通过对遗留在皮革面不同时间的指印采用常规熏显、自然贴附、控制湿度贴附三种方法进行处理并比较效果。结果　控制湿度贴附显现法在皮革面上显现的成功率高于效果明显常规熏显法和自然贴附法。结论　为皮革面上手印的显现提供了一种新的方法     

短波紫外反射照相显现胶带粘面潜在指印

目的研究胶带粘面上指印的提取方法。方法用短波紫外照相的方法对各种胶带粘面的指印进行拍照提取。结果从理论上解释了短波紫外照相拍照提取胶带粘面上指印的原理,从实践上为短波紫外照相法提取胶带粘面上指印提供技术方法和技巧。结论为胶带粘面指印的提取提供了一种新的方法。     

不同纸张上浓重红色印泥手印减薄的技术研究

目的建立有效的显现纸张上浓重的印泥手印方法。方法对普通材料纸和打印纸上的浓重红色印泥手印，通过指纹胶带提取转印、氧化漂白减薄、有机溶剂溶解减薄3种技术方法的减薄效果以及它们在减薄过程中的优缺点进行比较，得出适合于各种减薄技术的最佳试剂。结果本研究发现3种方法均可以有效地使浓重红色印泥手印清晰化，进而达到有效显现纸张上浓重的印泥手印的目的。     

毒物鉴定信息资源介绍及法医毒物学数据库构想

信息资源作为现代社会的一种重要资源,在各专业领域中显示出其无可替代的价值。毒物鉴定同样需要专业信息的强有力支持。根据法医毒物鉴定实践的信息需求,对可能涉及的相关信息资源来源,尤其是网络在线数据库资源进行综述和评价。同时,探究了建立适合毒物鉴定专业需求的＂法医毒物数据库及其信息平台＂的可行性和设计构思,并对其应用做出展望。     

上转换发光微粒悬浮液显现手印技术初探

目的 建立NaYF4∶Er,Yb微粒悬浮液显现手印技术方法并界定适用范围与条件.方法 用NaYF4∶Er,Yb微粒悬浮液显现瓷砖、玻璃等19种（各50枚）不同客体上皮脂汗手印,并对结果进行分析比较.结果 该方法对背景复杂的非渗透性客体上的油汗手印显现良好,其效果优于普通ZnO小颗粒悬浮液.结论 该方法操作简便、适用客体广泛、背景干扰少,适合进一步研究推广.     

DNA recovery after sequential processing of latent fingerprints on copy paper

Forensic examiners must determine whether both latent fingerprint development and DNA profiling can be performed on the same area of an evidence item and, if only one is possible, which examination offers the best chance for identification. Latent fingerprints can be enhanced by targeting different components of fingerprint residues with sequential chemical treatments. This study investigated the effects of single-reagent and sequential latent fingerprint development processes on downstream DNA analysis to determine the point at which latent fingerprint development should be stopped to allow for DNA recovery. Latent fingerprints deposited on copy paper by one donor were developed using three sequential processes: 1,8-diazafluoren-9-one (DFO) → ninhydrin → physical developer (PD); 1,2-indanedione-zinc (IND-Zn) → ninhydrin → PD; and IND-Zn → ninhydrin → Oil Red O (ORO) → PD. Samples were examined after the addition of each chemical treatment. DNA was collected with cotton swabs, extracted, quantified, and amplified. DNA yields, peak heights, number of alleles obtained, and percentage of DNA profiles eligible for CODIS upload were examined. DNA profiles were obtained with varying degrees of success, depending on the number and type of treatments used for latent fingerprint development. The treatments that were found to be the least harmful to downstream DNA analysis were IND-Zn and IND-Zn/laser, and the most detrimental treatments were DFO, DFO/laser, and PD. In general, as the number of treatments increase, the opportunities for DNA loss or damage also increase, and it is preferable to use fewer treatments when developing latent fingerprints prior to downstream DNA processing.     

A Monte Carlo simulation and sensitivity cost benefit analysis for use of nylon 4N6FLOQSwabs®

Forensic genetic laboratories are challenged with implementing innovation even if the benefits to operational performance are well demonstrated often because of internal budget constraints. A prospective cost–benefit analysis (CBA) could support justification for an increased budget by effectively demonstrating in a system-based approach the relatively small cost of increasing a laboratory budget can substantially reduce costs to society (both qualitatively and monetarily). A Monte Carlo simulation and sensitivity CBA was performed using a more expensive swab (i.e., nylon 4N6FLOQSwabs®) compared with a less costly cotton swab. Ranges of input values and tangible and intangible benefits were considered. The outcome is that the relatively small increased cost of using a nylon swab pales compared with the potential tangible and intangible benefits to the overall system. This approach provides a sounder basis for requesting additional funds to support implementation of technologies and better approximates realistic situations while accommodating uncertainty of input values.