An evaluation of measurement uncertainty of trajectory angles using a 3D laser scanner

Measuring trajectory angles of bullet defects at a crime scene is an important part of crime scene investigation as these angles can be used for shooting incident reconstructions. The Washington State Patrol Crime Scene Response Team (WSP CSRT) had a desire to report and use measured trajectory angles. To report quantitative measurements, a statement of uncertainty for the measurement must also be reported due to an accreditation requirement through the ANSI National Accreditation Board (ANAB), through which the WSP CSRT is accredited. This evaluation examined the measurement uncertainty of the 3D laser scanning method that the WSP CSRT utilizes for measuring the vertical and azimuth angles from trajectory rods fitted to bullet defects. Three studies were performed which examined the variation of vertical and azimuth angle measurements from trajectory rods on flat surfaces, the variation of azimuth angle measurements from a trajectory rod on a curved surface, and a traceability study with known vertical and azimuth angle measurements. Seven common substrates were selected as target materials and were shot with 9 mm Luger and 0.45 Auto caliber bullets. A vehicle with one bullet defect was utilized for the curved surface study. The WSP's current fleet of Trimble X7 3D laser scanners, the WSP Criminal Investigation Division (CID) Detectives who operate these scanners, and the Forensic Scientists responsible for trajectory rod placement and angle measurements were utilized. An overall measurement uncertainty of +/− 2.6 degrees at an approximate 95% confidence interval was determined for all trajectory angles measured from trajectory rods.     

党性教育视阈下三线精神的时代价值与实践路径

三线精神是民族精神、奋斗精神的重要组成部分,其源于上世纪60-80年代,是党和国家以巩固国防和充实备战为目标,在西北、西南地区开展的以工业和交通业为主的经济建设取得巨大成就而形成的一种精神。三线精神既是中国共产党革命建设精神的传承创新,也是中华民族精神的宝贵财富。其历久弥新的历史价值和时代精神在决胜全面建成小康社会、夺取新时代中国特色社会主义伟大胜利进程中具有重要作用,对提升新时代党员干部的党性修养具有重要价值。     

莫达非尼药片的激光共聚焦显微拉曼光谱快速检验

目的建立莫达非尼药片的拉曼光谱快速定性检验方法。方法莫达非尼对照品和药片检材分别研磨后经拉曼光谱检验得到拉曼谱图。结果经比较,二者图谱一致,确定检出莫达非尼成分,结果可靠。结论莫达非尼药片在本文所述的条件下有较好的响应,峰型较好,峰位准确,同时药片中的淀粉等物质干扰较小。本文所建立的拉曼光谱检验方法,简便、高效、准确,可供一线执法、检验部门对查获的莫达非尼药片进行快速的定性检验。     

Human height estimation from highly distorted surveillance image

Video surveillance camera (VSC) is an important source of information during investigations especially if used as a tool for the extraction of verified and reliable forensic measurements. In this study, some aspects of human height extraction from VSC video frames are analyzed with the aim of identifying and mitigating error sources that can strongly affect the measurement. More specifically, those introduced by lens distortion are present in wide-field-of-view lens such as VSCs. A weak model, which is not able to properly describe and correct the lens distortion, could introduce systematic errors. This study focuses on the aspect of camera calibration to verify human height extraction by Amped FIVE software, which is adopted by the Forensic science laboratories of Carabinieri Force (RaCIS), Italy. A stable and reliable approach of camera calibration is needed since investigators have to deal with different cameras while inspecting the crime scene. The performance of the software in correcting distorted images is compared with a technique of single view self-calibration. Both approaches were applied to several frames acquired by a fish-eye camera and then measuring the height of five different people. Moreover, two actual cases, both characterized by common low-resolution and distorted images, were also analyzed. The height of four known persons was measured and used as reference value for validation. Results show no significant difference between the two calibration approaches working with fish-eye camera in test field, while evidence of differences was found in the measurement on the actual cases.     

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.     

群众路线教育实践活动总要求的内涵解读

党的群众路线教育实践活动明确提出"照镜子、正衣冠、洗洗澡、治治病"的总要求,概括起来就是要自我净化、自我完善、自我革新、自我提高。坚持把"照镜子、正衣冠、洗洗澡、治治病"总要求,贯穿落实到党的群众路线教育实践活动的全过程,就是要使广大党员干部尤其是领导干部,在宗旨意识、工作作风、廉洁自律上找出差距、修身正我;按照为民、务实、清廉的要求,自觉把党性修养正一正、把党员义务理一理、把党纪国法紧一紧,保持共产党人的良好形象;以整风精神开展批评与自我批评,清洗思想和行为上的灰尘,保持共产党人政治本色;坚持惩前毖后、治病救人方针,区别情况、对症下药,切实体现从严治党要求,确保教育实践活动沿着正确轨道健康深入推进。     

从井冈山的斗争看“实事求是”是我们党思想路线的精髓

井冈山——中央苏区时期的斗争经验告诉我们,“实事求是”是马克思主义的精髓,也是我们党思想路线的精髓。它是我们党理论创新和联系实际的产物。实事求是必须一切从实际出发,必须有改革创新的理论勇气和付诸实践的坚强决心,必须坚定不移地走群众路线。抚今追昔,展望未来,我们必须汲取历史的经验教训,牢记只有不断改革、开放、创新,只有始终坚持实事求是,时刻不忘密切联系群众,我们党和党的事业才有光明的未来。     

毛泽东群众观的当代发展和实践要求

毛泽东群众观是毛泽东在领导中国革命和建设的实践过程中形成的,主要内容包括:人民群众在社会历史发展中的作用、党和群众的关系、党的宗旨以及群众路线。在新的历史条件下,邓小平、江泽民、胡锦涛及习近平丰富发展了毛泽东的群众观。十八大以来,以为民务实清廉为主要内容的党的群众路线教育实践活动在全党开展,对践行群众观提出了新的实践要求。     

黑色墨迹的拉曼光谱分析

目的对常见的黑色墨迹进行初步筛选,为墨迹的进一步检验提供依据。方法依据黑色墨迹的同色异谱特征,利用显微共焦激光拉曼光谱仪对19种黑色墨迹进行分析检验。结果根据不同墨迹的拉曼谱图,19种黑色墨迹可以分为3大类,即:未检出拉曼峰的墨迹,只检出碳物质的墨迹,以及主体色料为染料的墨迹。结论拉曼光谱可用于区分不同种类黑色墨迹,从而为选择合适的方法对黑色墨迹进一步进行检验奠定基础。     

充分发挥龙胜在桂林旅游北线中的龙头作用

龙胜＂十二五＂纲要要求：突出抓好大力实施＂旅游兴县＂发展战略,以桂林大旅游圈为依托,以旅游市场为导向,以旅游资源为基础,以景区（点）建设及旅游效益为中心,大力整合旅游资源和旅游产品,优化旅游产业结构,构建多元生态旅游体系,着力打造旅游精品,创造旅游品牌。如今,龙胜旅游遇到的发展机遇前所未有,应当在整个桂林旅游发展中展现自己鲜明的特色和个性,既要实现中国旅游强县的目标,又要在桂林旅游北线中发挥龙头作用。