排序方式: 共有109条查询结果,搜索用时 15 毫秒
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赵京华 《河北公安警察职业学院学报》2007,7(4):67-70
运用套叠式手枪基础训练检查器(专利号CN200420054786.7)在南京森林公安高等专科学校2006级警察战术与指挥专业(特警班)射击课中运用,随机抽取50名学生为样本,分为对照组与实验组。结果表明,手枪基础训练检查器在射击课教学中操作简单、方便教学,实验班射击技能成绩优于对照班的学生。 相似文献
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When a bullet punctures a surface, it leaves behind a bullet impact, which can be analyzed in order to determine the origin and trajectory path from which a bullet was discharged using many different scientific methods to reconstruct a shooting scene. The purpose of the research was to test the accuracy and repeatability of reconstructing the impact angle of single bullet impacts using the ellipse method. The research was conducted by firing various calibers of ammunition into drywall panels positioned at varying angles of incidence from 88° until ricochet occurred. This was done in order to determine which caliber type and angle of incidence are most accurate and precise for reconstructing a shooting scene. The study examined four caliber types fired into drywall panels, with 5 repeated shots for each of the 11 angles of incidence (n = 220). Furthermore, 31 participants partook in the study to estimate a bullet impact angle of incidence utilizing the ellipse method. The results show that the best performance (accuracy and repeatability) is seen with the measurements of the 0.45 caliber ammunition. When angle of incidences is low (<64°), the performance (accuracy and repeatability) was seen to be better in all caliber ammunitions. Overall, the data provided for single bullet impacts deposited in drywall show that the ellipse method is useful in providing measurements for most crime scene reconstruction purposes and has also demonstrated that results vary depending on the type of ammunition, firearm, and angle of incidence being examined. 相似文献
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A Computational Framework for Age‐at‐Death Estimation from the Skeleton: Surface and Outline Analysis of 3D Laser Scans of the Adult Pubic Symphysis 下载免费PDF全文
Bridget F. B. Algee‐Hewitt Ph.D. Jieun Kim Ph.D. Dennis E. Slice Ph.D. 《Journal of forensic sciences》2017,62(6):1434-1444
In forensic anthropology, age‐at‐death estimation typically requires the macroscopic assessment of the skeletal indicator and its association with a phase or score. High subjectivity and error are the recognized disadvantages of this approach, creating a need for alternative tools that enable the objective and mathematically robust assessment of true chronological age. We describe, here, three fully computational, quantitative shape analysis methods and a combinatory approach that make use of three‐dimensional laser scans of the pubic symphysis. We report a novel age‐related shape measure, focusing on the changes observed in the ventral margin curvature, and refine two former methods, whose measures capture the flatness of the symphyseal surface. We show how we can decrease age‐estimation error and improve prior results by combining these outline and surface measures in two multivariate regression models. The presented models produce objective age‐estimates that are comparable to current practices with root‐mean‐square‐errors between 13.7 and 16.5 years. 相似文献
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李恤忠 《江西公安专科学校学报》2007,(5):126-128
在射击过程中,如果学员训练时间不长或经验不足,心理活动的变化就会使其形成的技术动作规律遭到破坏,究其原因,在于学员的害怕心理、缺乏自信心、重复性受挫、成绩观念、习惯性怯场等。对此,应用心理暗示法、意念训练法、表象训练法、腹式松弛训练法、适应性训练法等进行矫正。 相似文献
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关于规范警务用枪的思考 总被引:1,自引:0,他引:1
警务用枪是法律赋予人民警察用来威慑与惩治违法犯罪的有力武器。警务用枪不仅关系到执法民警的自身安危,还关系到公安机关的执法形象和法律权威。目前,我国的警务用枪的现状还并不尽如人意。针对其中所存在的问题,应采取相关整改措施,力争早日规范警务用枪。 相似文献
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齐怀文 《河南公安高等专科学校学报》2010,(5):57-59
面对日益严峻的社会治安形势,如何提高实战中的射击能力成为公安干警面临的主要问题之一。应着重从警察手枪实用射击、警察手枪互动战术射击训练方法(包括动态射击)和不同目标的射击训练等方面入手,提高公安干警在实战中的射击能力。 相似文献
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An Empirical Study on the Relation Between the Critical Angle for Bullet Ricochet and the Properties of Wood 下载免费PDF全文
Wim Kerkhoff Ivo Alberink Ph.D. Erwin J.A.T. Mattijssen M.Sc. 《Journal of forensic sciences》2015,60(3):605-610
The properties of a bullet, an object, and the incidence angle determine whether the bullet will penetrate, perforate, or ricochet. In this study, the critical angle for ricochet was established for .32 Auto and 9 mm Luger bullets on Abachi, Southern Yellow Pine, Beech, and Ipe wooden boards. Results show that the critical angle differs depending on caliber and wood type. The critical angle is higher for .32 Auto bullets than for 9 mm Luger bullets and increases with increasing wood density and Janka hardness. The established critical angles for ricochet on the lightest and softest wood (Abachi) are 10.4° and 10.3° for .32 Auto and 9 mm Luger, respectively. For the heaviest and hardest wood (Ipe), the angles were 45.0° and 33.4°, respectively. The combined results on the four tested woods show a strong linear relationship between both the density and the hardness and the critical angle for both calibers. 相似文献
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传统的手枪射击训练模式只注重训练技术和技术练习的结果,不重视练习的过程是否符合公安执法特点,导致手枪射击练习模式是"为打靶而训练",这是严重脱离实战的,必然严重影响警察战斗力的提升。要扭转这一现实就必须转变观念,要建立"为实战而训练"的观念,使训练紧紧围绕"实战"这个核心思想,注重训练警察执法实战所需的技能、意识、程序以及规范性。 相似文献
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张黎 《北京人民警察学院学报》2006,(3):28-32
监听的广泛应用极大地增强了打击和控制犯罪的力度。监听既侵害公民基本权,又从根本上保障公民基本权的实现。世界各国大都通过立法对监听进行必要的限制,我国在这方面仍处于空白,亟待建立符合现代法治需要的监听制度。 相似文献