The Anatomy of a Pipe Bomb Explosion: Measuring the Mass and Velocity Distributions of Container Fragments

Improvised explosive devices such as pipe bombs are prevalent due to the availability of materials and ease of construction. However, little is known about how these devices actually explode, as few attempts to characterize fragmentation patterns have been attempted. In this study, seven devices composed of various pipe materials (PVC, black steel, and galvanized steel) and two energetic fillers (Pyrodex and Alliant Red Dot) were initiated and the explosions captured using high‐speed videography. The video footage was used to calculate fragment velocities, which were represented as particle velocity vector maps. In addition, the fragments were weighed. The results demonstrate a correlation between the type of energetic filler and both the size and velocity of the fragments. Larger fragments were produced by Pyrodex filler indicating a less complete fragmentation, compared with smaller fragments produced by double‐base smokeless powder. Additionally, higher fragment velocities were seen with Alliant Red Dot filler.     

一种水下金属物证探测器的设计

目的 设计一种水下金属物证探测器,用于公安人员在池塘、沟渠、水井等水域中搜寻金属类物证.方法 采用金属探测技术、水下视频采集技术和无线传输技术相结合,实现探测器的多功能特性.结果 在深度不超过4m的水域中,借助探测器可以准确搜寻到金属物证.结论 该探测器具有金属探测以及视频图像采集、无线发送和保存的功能,能满足一定范围内搜寻水下金属物证的工作需求.     

国际关系的语言转向与建构主义理论发展研究:以语言游戏为例

19世纪末20世纪初发生的西方哲学的语言转向对西方思想文化的很多领域都产生过并仍在产生着重大影响,这次语言转向使人们更加意识到语言具有一定的本体地位,具有行事功能和社会功能,同时产生意义的主体间性。另一方面,语言在国际关系的很多理论中被简约掉,国际关系的语言转向研究也相对比较迟缓,主要集中在建构主义和后结构主义。本文主要以语言游戏为例,从规则的建立、遵守和转变来分析语言转向对建构主义理论的影响,主要体现在语言建构规则,规则塑造语境,语境决定意义、意义限制行为,而语言在整个过程中起了重要作用。     

青少年痴迷电脑游戏的哲学思考

对青少年痴迷电脑游戏这一现象进行哲学层面的思考,窥探其精神世界,帮助他们认清危害,参加社会实践是走出痴迷电脑游戏的关键。     

Suspect Height Estimation Using the Faro Focus3D Laser Scanner

At present, very little research has been devoted to investigating the ability of laser scanning technology to accurately measure height from surveillance video. The goal of this study was to test the accuracy of one particular laser scanner to estimate suspect height from video footage. The known heights of 10 individuals were measured using an anthropometer. The individuals were then recorded on video walking along a predetermined path in a simulated crime scene environment both with and without headwear. The difference between the known heights and the estimated heights obtained from the laser scanner software were compared using a one-way t-test. The height estimates obtained from the software were not significantly different from the known heights whether individuals were wearing headwear (p = 0.186) or not (p = 0.707). Thus, laser scanning is one technique that could potentially be used by investigators to determine suspect height from video footage.     

城市视频监控系统建设及应用中的问题与对策--以辽宁省阜新市彰武县公安局为例

经过近十年的发展,我国的城市视频监控系统建设取得了长足的进步,在公安机关预防和打击违法犯罪活动中起到了越来越重要的作用。但是,城市视频监控系统建设投入大,技术更新快,维护成本高,高效利用难。从公安业务应用的角度,调查分析了阜新市彰武县公安机关视频监控系统建设与应用现状,总结了当前城市视频监控系统建设与应用中存在的共性问题,并在此基础上提出了加强与改进城市视频监控系统建设和应用的对策措施。     

影视环境对大学生的影响及构建

环境影响在加强大学生思想政治教育工作中意义重大,科学地认识环境对人的影响是开展大学生思想政治教育工作的前提和基础。影视是当代大学生接触最广、影响最深的媒介之一,做好高校影视育人环境构建,对于树立大学生科学的世界观、人生观和价值观以及远大的理想具有重要的现实意义。     

论同步录音录像资料的证据属 性简

同步录音录像资料作为一种记录侦查询问过程、固定言词证据、保证程序合法的材料和方式,日益凸显着它的证据价值.然而,其证据属性在新《刑事诉讼法》中并未明确.但是,新《刑事诉讼法》认定证据的标准已经更具开放性.同步录音录像资料的证据价值不仅具有司法实践的基础,更具有证据的客观性、关联性、合法性等基本属性,其证据地位有待通过司法解释或进一步立法予以明确.     

视频监控系统在侦查中的应用价值

严峻的犯罪形势要求公安机关转变侦查破案的思维方式,创新打击犯罪的策略方法,向科技要警力。视频监控系统在打击犯罪中具有传统侦查手段所不具备的独特价值,在预防犯罪、抓获犯罪嫌疑人、固定证据和案件串并等方面发挥着重要的作用。但视频监控系统在建设、具体应用和法律规范方面还存在一些问题需要研究解决。     

浅谈远程学习网站视频资源的开发与设计

远程学习网站视频资源开发应综合创新引入教学设计思想，有效的网络视频应当积极地进行信息的加工、解释和综合，使用各种策略传授信息，从而促进学生自主学习效果。另外要运用数字图像的生动可视特点，还需要对学习者的认知心理进行准确分析，精心设计内容的呈现方式。