Optical enhancement of fingerprint deposits on brass using digital color mapping

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.     

Latent Fingerprint Visualization using a Scanning Kelvin Probe in Conjunction with Vacuum Metal Deposition

The application of vacuum metal deposition before scanning Kelvin probe visualization of fingerprints is investigated. The potential contrast between fingerprint ridges and furrows is maximized by the use of silver deposition for non‐noble metals and gold–zinc deposition for noble metals. The higher susceptibility of eccrine fingerprints to vacuum metal overdeposition is confirmed. Additionally, fingerprints are best developed individually and by building the metal deposition slowly to protect against overdevelopment and variation in the rate of metal condensation. The progress of the metal deposition can be monitored using the scanning Kelvin probe by reference to the change in potential and continuity of the new potential on the surface. The use of acetic acid solution for the recovery of overVMD‐developed samples is shown not to be useful. Applying the metal deposition has the additional prospect of increasing surface conductivity and homogeneity and both can aid fingerprint visualization using the scanning Kelvin probe.     

青年干部职务犯罪的成因透视与预防重构

"职务犯罪年轻化"的趋势与社会环境、思想观念的变化密切相关,既有微观层次上个人素质的原因,也有宏观层次上制度结构的原因.本文在对青年干部职务犯罪及其成因进行分析的基础上,着眼于从思想源头遏制入手,重新构建了预防青年干部职务犯罪的思路,并提出了相应的措施.     

夏枯草和薯蓣不同部位铅镉汞砷的含量分析

目的 :以夏枯草、薯蓣为例 ,探查铅 (Pb)、镉 (Cd)、汞 (Hg)、砷 (As)在药用植物不同部位的分布。方法 :采用湿法消化 ,原子吸收分光光度法测定Pb、Cd ,原子荧光法测定Hg、As。结果 :夏枯草和薯蓣不同部位都含有Pb、Cd、Hg、As ,其中Pb的含量最高 ,两植物中 4种重金属元素的含量高低顺序均为 :Pb >As≥Cd >Hg ;Pb和Hg在不同部位的含量分布高低顺序是 :叶 >根 >茎 >果穗 ;Cd在两植物根部含量分布最高 ;As在两植物中有不同的分布。结论 :Pb和Hg主要分布在吸收部位 ,叶受其污染最为严重 ;Cd主要贮存于 2种植物的根部 ;果穗中重金属含量分布最低。     

电除尘器节电的探讨

从经典分离粒子所需能量很小的理论分析目前国内外采用的常规电除尘 ,其电场能耗还有 98%以上的潜力可挖。“软稳”电除尘技术节电是很明显的。     

可乐套头葬俗与南夷原始信仰试析

套头葬是贵州省赫章县可乐镇发掘出来的夜郎时期特有的一种葬俗。墓中用铜釜或铁釜或铜鼓套在死者头部 ,个别还同时在死者足部套一件铁釜。这种墓葬则有可能系夜郎“夷人”之墓。     

The thermodynamics of latent fingerprint corrosion of metal elements and alloys

Redox reactions taking place between the surface of a metal and fingerprint residue have been expressed thermodynamically in terms of both the Nernst equation for reduction potential and the complexation constant for the formation of complex metal halide ions in aqueous solution. These expressions are used to explain experimental results for the corrosion of 10 different metal elements by fingerprint residue in air at room temperature. Corrosion of noble metals, such as silver and gold, supports the proposition that the degree of metal corrosion is enhanced by the presence of chloride ions in eccrine sweat. Extending the experiments to include 10 metal alloys enabled the construction of a fingerprint corrosion series for 20 different metals. Fingerprint corrosion on metals alloyed with > approximately 40% copper was found to display third level fingerprint detail. A comparison of both conventional ink on paper and digital (Livescan) fingerprinting techniques with fingerprints deposited on 9 Karat gold alloy has shown that gold alloy depositions are least susceptible to third level detail obliteration by poor fingerprint capturing techniques.     

Fatal Electrocution by a Support Metal Wire

Abstract: Electrocution is not an uncommon cause of death. A case of fatal electrocution by a metal wire that was used as a support for the insulated television cable wire is reported. Electric current flowed through the metal wire when it touched the residential power line. Electrical injury caused because of contact with the live metal wire is described with histopathological findings. This case reports the circumstances that led to accidental fatal electrocution in an outdoor setting during the rainy season. Significance of death scene investigation to confirm the cause and manner of death in cases of fatal electrocution is highlighted. Public awareness programs to lay emphasis on electrical safety in domestic environment need to be introduced to prevent fatalities resulting from ignorance and/or negligence.     

高校贫困生心理健康问题探析

本文通过对高校贫困生心理存在的自卑、焦虑、沮丧、文饰、狭隘五个问题,进行分析,找出其受影响的三个因素,即家庭因素、社会因素、个体因素,并提出通过引导、帮助、鼓励的对策来调解贫困生心理问题。     

芒针深刺八髎穴治疗脊髓损伤后神经源性膀胱临床观察

目的 观察芒针深刺八髎穴治疗脊髓损伤后神经源性膀胱的临床疗效。方法 选取54例脊髓损伤后神经源性膀胱患者,先进行残损分级评级,再采用随机数字表法将其分为对照组和观察组,每组27例。对照组行常规针刺联合膀胱功能训练,观察组行芒针深刺八髎穴联合膀胱功能训练。比较两组患者治疗前后排尿日记指标、最大尿流率、膀胱残余尿量、生活质量指数评分以及临床疗效。结果 两组患者治疗后排尿日记各指标均较治疗前显著改善(P<0.05),且观察组各项指标改善情况显著优于对照组(P<0.05)。与治疗前比较,治疗后两组患者最大尿流率显著增加,膀胱残余尿量显著减少(P<0.05),且观察组最大尿流率增加程度及膀胱残余尿量减少程度均大于对照组(P<0.05)。与治疗前比较,治疗后两组患者生活质量指数评分均显著减少(P<0.05),且观察组患者生活质量指数评分减少程度显著大于对照组(P<0.05)。观察组疗效优于对照组(P<0.05)。结论 芒针深刺八髎穴能有效改善脊髓损伤后神经源性膀胱患者排尿情况及生活质量,恢复患者膀胱功能,减少膀胱残余尿量。