Analytical Fingerprint of Wolframite Ore Concentrates

Ongoing violent conflicts in Central Africa are fueled by illegal mining and trading of tantalum, tin, and tungsten ores. The credibility of document‐based traceability systems can be improved by an analytical fingerprint applied as an independent method to confirm or doubt the documented origin of ore minerals. Wolframite (Fe,Mn)WO₄ is the most important ore mineral for tungsten and is subject to artisanal mining in Central Africa. Element concentrations of wolframite grains analyzed by laser ablation‐inductively coupled plasma‐mass spectrometry are used to establish the analytical fingerprint. The data from ore concentrate samples are multivariate, not normal or log‐normal distributed. The samples cannot be regarded as representative aliquots of a population. Based on the Kolmogorov–Smirnov distance, a measure of similarity between a sample in question and reference samples from a database is determined. A decision criterion is deduced to recognize samples which do not originate from the declared mine site.     

政府行为失范下的维稳困境——基于转型期我国地方政府失范拆迁行为的思考

随着我国社会转型的不断深入，利益分化程度不断加剧，各种群体性突发事件明显增多，特别是近几年来，由于地方政府行为失范所诱发的各种拆迁矛盾层出不穷，愈演愈烈，致使我国维稳陷入困境。为此，规范地方政府行为，维护社会稳定、和谐，是目前摆在我们面前的一个重大任务。     

微束X射线荧光分析法鉴别激光打印机墨粉的研究

目的利用微束X射线荧光分析法（μ-XRF）研究激光打印机用墨粉的鉴别。方法利用μ-XRF对9台不同型号激光打印机用墨粉、对应的打印字迹、提取的字迹墨粉所含元素进行定性、半定量的分析。结果根据检出元素种类的不同,可将9台不同型号激光打印机用墨粉、对应的打印字迹、提取的字迹墨粉分成7类、4类、4类,区分率分别为94.4%、75%、69.4%。结论本研究所建立的μ-XRF鉴别激光打印机墨粉方法具有微区、原位无损检验等优点,对提高激光打印文件检验水平具有现实意义。     

Use of hand-held laser scanning in the assessment of craniometry

The intra- and inter-examiner reliability was evaluated for hand-held 3D laser scanning technology when it was combined with localization of landmarks for craniometry. The data from the laser surface scanning were compared with those of conventional direct measuring. Using thirty unidentified skulls requested for individual identification, measurements were taken of the line distances from lambda to 26 landmarks, and also for seven breadth parameters. For the laser surface scanning, two examiners performed replicate measurements with an interval of 1 week. In the conventional direct measuring, the first examiner took replicate measurements with a 1-week interval. To assess intra- and inter-examiner reliabilities, the intraclass correlation coefficient was used. Analysis of variance with repeated measures for each parameter was performed to compare the conventional method with the 3D scanning method. Both the 3D scanning and conventional methods showed excellent intra-examiner reliabilities, and the 3D laser scanning method also showed excellent inter-examiner reliability. A statistical difference between the two examiners was found only in nasal breadth in the 3D laser scanning method. There was no significant difference between the two measuring methods, though the 3D laser scanning method tended to give a slightly lower reading. Collectively, the 3D laser scanning method with point localization is a useful method with excellent reliability, and it can replace the conventional direct measuring method in craniometry.     

论我国破产管理人制度的构建

破产管理人在破产程序中居于相当重要的地位。我国现行破产制度由于对破产管理人未有科学的定位,导致在破产管理人的选任、撤换与监督方面存在明显的缺陷。本文正是从破产管理人的法律地位切入,用比较研究的方法,提出了构建我国破产管理人制度的设想。     

铜导线一次和二次短路熔痕的显微共聚焦激光拉曼光谱特征研究

目的 为了判定火灾发生的原因,依据激光拉曼光谱(RMS)能够反映出经过不同高温热处理炭材料的石墨化程度,以此来探索电气短路判定的技术依据.方法 利用显微共聚焦激光拉曼光谱仪对火灾中不同环境下生成的铜导线短路熔痕表面碳痕斑进行检测分析,利用碳痕斑两个拉曼特征位移峰的比值,计算不同短路熔痕表面碳化斑的石墨化度.结果 铜导线的一次短路、二次短路和火烧熔痕上残留碳斑石墨化度不同,一次短路熔珠碳痕的石墨化度R值最小,火烧熔痕的石墨化度R值最大.结论 该研究建立了显微激光拉曼光谱法无损检测分析铜导线短路熔痕的新方法.     

激光模拟对抗训练在警务战术教学中的实践探讨

激光模拟对抗训练是以模仿实战情境为背景,利用激光电子设备进行的一种单边或多边的战术对抗模式。将激光模拟对抗训练融入到警务战术教学的不同阶段对于激发学员学习兴趣,培养战术安全意识、增强团队协作意识、完善技、战术能力和巩固教学单元训练成果都将起到积极的促进作用。     

房屋拆迁权的滥用与预防

房屋拆迁权的行使是否合法 ,是一个被立法和理论研究遗忘的问题 ,其合法性应从实体要件和程序要件两个方面评定。拆迁行为是否符合社会公共利益 ,是判定拆迁是否符合实体要件 ,以及是否被滥用的唯一标准。公共利益的层次性 ,是解决房屋拆迁权冲突的法理依据。行政救济是房屋拆迁权合法的程序要件 ,应当在房屋拆迁前实施行政听政制度 ,并允许拆迁当事人提出行政复议和行政诉讼。     

基体辅助激光解吸电离飞行时间质谱鉴别乌头的研究

目的建立乌头类中药鉴别的基体辅助激光解吸电离飞行时间质谱方法。方法以DHB为基体,优化飞行时间质谱分析条件,对不同种类的乌头类中药进行飞行时间质谱分析,找出乌头类的指纹峰。结果通过比较炮制乌头与生乌头质谱指纹峰的差异,可作出乌头类是否经炮制的判断。结论基体辅助激光解吸电离飞行时间质谱用于乌头类中药的定性鉴别,分析方法灵敏、准确、快速。     

Fatal Phenol Toxicity Following Attempted Tattoo Removal

Tattoo removal is increasingly required as the number of, particularly young, people acquiring tattoos is increasing. A 21‐year‐old man is reported who underwent attempted removal of large dragon tattoo utilizing a tattoo machine that injected a phenol‐containing solution. At the end of the 3‐h procedure, he collapsed and died. At autopsy, large areas of white skin discoloration with focal necrosis and sloughing were present overlying areas of previous tattooing. Histological examination showed collections of eosinophilic fluid with a minimal chronic inflammatory infiltrate in better preserved areas, with focal areas of dermal necrosis. Toxicology was positive for phenol in cardiac blood and liver tissue. There were no underlying organic disease or injuries present which could have caused or contributed to death. This idiosyncratic method of tattoo removal involving subcutaneous injection of phenol had resulted in death most likely from cardiotoxicity.