The Accuracy and Repeatability of Reconstructing Single Bullet Impacts Using the 2D Ellipse Method

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.     

大鼠挫伤骨骼肌中M1/M2型巨噬细胞时间相关性研究

目的 研究大鼠骨骼肌挫伤后M1/M2型巨噬细胞浸润的动态变化规律结合组织学改变建立损伤时间推断方法.方法 建立大鼠骨骼肌挫伤模型,挫伤后6h、12h、24h、36h、48h、60h、72h、96h、144h、216h、336h为实验组,对照组不进行任何处理.采用HE染色法和免疫荧光多重染色方法观察骨骼肌挫伤后修复规律,...     

量刑方法论——从对传统观念的检讨与批判谈起

对犯罪人裁量决定刑罚是刑事审判中重要的环节,事关对司法活动公平与正义的评价.而正确把握量刑的方法,对做到"罚当其罪"和"罪刑相适应"至关重要.从传统观念的检讨与批判谈起,论述量刑的理念、原则、方法和因素,并在量刑的步骤和方法上提出见解.     

问题教学法的实践与思考

运用问题教学法需要技巧并坚持一定的原则,只有这样才能取得良好的教学效果,学生才能从中受益。     

刑侦画像造型训练方法的研究

刑侦画像是依据目击者的记忆语言描述,利用素描等手法模拟刻画犯罪嫌疑人相貌特征的技术手段。刑侦画像造型训练方法的研究,为刑侦画像技术的教育实践工作探索科学有效的培养训练方法,以适应我国公安刑侦工作的实际需要。     

Productivity,craftwork and flexibility: the Mobil agreements

ABSTRACT

Using original documents, this paper describes and analyses the case study of one of the productivity bargaining agreements from a leading exponent of productivity bargaining, Mobil’s Coryton Refinery. As well as being important in the UK oil industry these agreements spread throughout the economy. They resulted in major concessions by the unions to relax inter-craft and craft-production trade boundaries and to changes in work methods. These are illustrated in detail and placed in context. Such changes were heralded as ‘new look industrial relations’ and as such were based on a conception of joint regulation. However, other interpretations are possible, and these are then explored and discussed.     

祖孙双单亲比对的匹配概率研究

目的推导祖孙双单亲比对的匹配概率(PMGDS)公式,并以随机模拟法进行验证。方法首先,根据定义推导PMGDS的数学公式,依据此公式在19个基因座上计算PMGDS的数值。其次,以随机模拟法设计实验,在19个基因座上计算PMGDS的模拟值。最后,以模拟值对比公式值的方式,对公式进行实验验证。结果研究获得了PMGDS的数学公式,经模拟实验验证显示出良好的符合。结论祖孙双单亲比对的错判概率较低,具有很好的应用价值。     

Lessons from International Multi-Option Referendum Experiences

Referendums are regularly criticised for reducing complex policy decisions to two maximally opposed options. This reduces opportunities for voter expression and can polarise debates. Alternative referendum designs which present more than two ballot options can offer innovative opportunities, but also raise new challenges. We can benefit by learning from previous experiences with multi-option referendum voting. Discussions of such experiences are rare and have often focussed on a limited number of cases. This article provides an overview of over 100 multi-option referendum experiences around the world. It discusses the topics on which they were held and the ballot options that were offered. It then analyses the variety in ballot design in terms of questions posed and voting methods applied. Drawing on the experiences of multi-option referendums, the article concludes with lessons that can be learned in relation to initiating and designing these referendums.     

天然药物化学课程教学方法的探讨

随着当前对天然药物开发研究的不断深入,天然药物化学课程的重要性也越来越受到重视。而传统的天然药物化学教学方式多为教师讲授,学生被动地听、甚至靠死记硬背,学生的学习兴趣没有得到激发,效率不高,普遍反映枯燥难学。因而全面提高天然药物化学的学习水平和教学质量具有重要意义。为此,作者结合自己的教学经验谈一些感受。     

第二次世界大战后武力使用规范的演进

在国际法体系中,武装冲突法可谓编纂得最为完备的一个分支。经过数百年的积累和铺垫,第二次世界大战后武力使用规范逐渐发展成为完整的规范体系并呈现出四大特征:即为了适应国际关系的新变化武装冲突法扩大了适用范围;使用核武器是否合法成为国际法的重要问题;出现了在武装冲突中"反向"使用武力以达到实现和平目的的新方式——联合国维持和平行动以及在武装冲突中出现了大量作为作战手段而使用的性暴力行为等。然而进入21世纪以后,武装冲突的形态与样式均发生了重大变化,一方面,以无人机、自主作战机器人、纳米生物武器和网络战为代表的新型作战手段方法层出不穷;另一方面,非国家行为体在武装冲突中使用武力的情况有所增加,更出现了私人军事安保公司等法律地位在国际法上尚处于空白的交战主体。以朝核危机为标志,核武器对于国际和平与安全的巨大的潜在甚至是现实的威胁再次凸显,迅速成为国际政治和国际法中的热点核心议题。值得注意的是,即使武装冲突法的基本原则依然相对稳定,但是不断出现的新作战手段和方法,仍然给国际法和国际安全提出了一系列亟须应对的新挑战。