A Ballistics Examination of Firearm Injuries Involving Breast Implants

This ballistics study examines whether saline breast implants can decrease tissue penetration in firearm injuries. We hypothesize that the fluid column within a saline breast implant can alter bullet velocity and/or bullet pattern of mushrooming. The two experimental groups included saline implants with 7.4 cm projection and a no implant group. The experimental design allowed the bullet to pass‐through an implant and into ballistics gel (n = 10) or into ballistics gel without passage through an implant (n = 11). Shots that passed through an implant had 20.6% decreased penetration distance when compared to shots that did not pass‐through an implant; this difference was statistically significant (31.9 cm vs. 40.2 cm, p < 0.001). Implant group bullets mushroomed prior to gel entry, but the no implant group mushroomed within the gel. Bullet passage through a saline breast implant results in direct bullet velocity reduction and earlier bullet mushrooming; this causes significantly decreased ballistics gel penetration.     

Police use of force: an examination of the minority threat perspective

The minority threat perspective suggests that the criminal justice system may be one mechanism through which the majority group (i.e. Whites) maintains control of culturally dissimilar minority groups. Although numerous studies have examined the relationship between minority representation and various policing outcomes, few have extended this research to police use of force in the context of stop-and-frisk practices. Using stop, question, and frisk data from the New York Police Department, this study examines (1) whether racial and ethnic composition influences police use of force, and (2) whether an individual’s race/ethnicity interacts with the racial/ethnic composition of a police precinct to produce disparities in police use of force. The results provide partial support for the minority threat perspective.     

Complaint reduction in Australian federal policing in the Australian Capital Territory

Across fifteen years to 2015–2016 the rate of public complaints against police in the Australian Capital Territory fell by an extraordinary 79%. This was a much larger and longer-term reduction in complaints than occurred anywhere else in Australia, and it is very unusual in the international policing literature. The paper attempts to examine the nature of this change in greater detail, and possible factors that may have influenced the change. Unlike some other studies, however, there was limited evidence of specific point-in-time innovations that may have affected the trend. Nonetheless, it is likely that a range of reforms in policing influenced the change, with possible lessons for other departments struggling with significant complaint problems. The main reforms included improved custody procedures, greater attention to ethics in recruitment and training, a complaints system focused on managing officer behaviour, enlarged external oversight, and more attention to de-escalation skills in use-of-force training.     

我国劳动力结构的演变及其影响研究

劳动力是经济增长的关键要素之一,其变化对我国经济社会发展有着深刻影响.本研究根据第七次全国人口普查主要数据,结合改革开放后以往人口普查数据和分年度人口数据,分析了我国劳动力结构的演变规律及可能带来的影响.研究发现,40余年来,我国劳动力结构发生了根本性的变化,并开始面临劳动年龄人口减少、抚养负担加重、劳动力地区分布不均...     

关于汽车弯路事故的几种受力分析

汽车转弯时发生的交通事故,除了因抢行或者瞭望不佳而引发事故以外,绝大多数是在侧滑力的作用下导致车辆驶离本车道发生碰撞或者追尾、倾翻的,此类问题易引发重特大交通事故。为了说明车辆转弯侧滑事故的机理,文章对车辆常见的几种转弯现象进行了受力分析,以期为事故处理提供可以借鉴的分析资料。