Determination of Vehicle Speed from Recorded Video Using Reverse Projection Photogrammetry and File Metadata

The prevalence of security and in‐car video has increased the number of motor vehicle accidents captured on digital video. However, inconsistencies in how to accurately determine time and distance for vehicle speed has led to examinations with varying results. A potential solution for calculating time intervals is to use frame timing contained within many digital video file's metadata, recorded with 0.000001 sec precision. This paper examines a fatal motor vehicle accident where frame timing information was used with distance measurements from reverse projection photogrammetry to calculate vehicle speed. A margin of error was then calculated based on the accuracy in performing reverse projection photogrammetry distance measurements. The resulting speed calculation was then compared to event data recorder data and found to be within an average of ±1.43538 MPH. Using specific time intervals may lead investigators to more accurate speed calculations, specifically those involving variable frame rate video.     

Wind-drag estimation in a traffic accident involving a motor scooter and a tractor-trailer

This case report describes a noncontact traffic accident involving a motor scooter and a tractor-trailer with a focus on the wind-drag effect. We used load cells to measure the drag force acting on a substantially similar motor scooter when a substantially similar tractor-trailer passes by it, taking into consideration various speeds of the tractor-trailer and distances between the two vehicles. A three-dimensional steady-state flow analysis was also performed by using the CFX program for computational fluid dynamics to examine the streamlines and the pressure distribution around the tractor-trailer at various speeds. From the experiment, for a separation distance of 1.0 m (3.28 ft) and a speed of 90 km/h (55.9 mph), the maximum resultant drag force is 124.5 N (28 lb); this constitutes a degree of force that could abruptly disrupt the stability in maneuvering by an operator who is unaware of the approaching tractor-trailer. In addition, a single equation that relates the tractor-trailer speed to the drag force that acts on the motor scooter was derived on the basis of the Reynolds number (Re) and the wind-drag coefficient (C(d)): C(d) = 1.298 × 10(-7) Re.     

关于工会应对“劳资突发事件”的思考

我国近年劳资冲突事件频繁发生,但应对处理能力明显不足。工会身处协调劳动关系第一线,有必要对劳资群体事件的主要原因、自身应扮演何种角色、该注意哪些问题作些分析与探索。     

XPS法在交通事故微量物证鉴定中的应用

把x射线光电子能谱分析法应用到微量物证学中,对车体痕迹的同一性认定进行分析,从而为交通事故的鉴定,特别是疑难的重特大事故的鉴定提供一个新的思路和一种新的技术。     

日本福岛核泄漏事故的法律省思

日本福岛核泄漏事故的发生有其历史的必然性,是上世纪50年代建立的日本式经济体制弊端在核电领域的折射。审视日本70年代建立的核电监督体制,其效率性存在不足,加之司法暧昧,一定程度上助推了事故的发生。     

加强培训提高工会干部的安慰技巧

我国目前还处于工伤事故的易发期,工伤事故不仅造成人员伤亡,而且对目击者及其受害者家属心理造成巨大创伤。工会在参与事故处理时、常去慰问职工,这是一种心理帮助。如果能通过培训,提高安慰技巧,不仅在一定程度上起到了心理危机干预的作用,也可以弥补目前我国专业心理学工作人员有限的问题。更体现了我国以人为本的安全发展理念。     

Interpretation of automotive light bulb examination results: an intriguing case

During the examination of light bulbs from a vehicle involved in a road accident, the headlights did not reveal any evidence regarding whether they were energized or not. Additionally, a police officer turned the lights on after the accident to verify their functioning, thus damaging some of the evidence. By examining the vehicle, it was determined that the park lights could provide answers regarding the conditions of the headlights. After observations, it was concluded that the park lights and headlights were off at the time of the impact. This case report demonstrates how important it is to integrate the circumstances surrounding the case into the interpretation of the results. Nevertheless, it also demonstrates the necessity for examining both the vehicle and all light bulbs in order to reach the most pertinent and proper conclusion.     

Characterization of the triacylglycerol crystal formation in adipose tissue during a vehicle collision

The unusual appearance of crystalline fat structures was observed during the postmortem examination of a motor vehicle accident victim. The crystal structures were characterized using Fourier transform infrared spectroscopy and x-ray diffractometry. The structures were found to be made of triacylglycerols, a dominant lipid structure found in human adipose tissue, capable of forming various polymorphic structures. The morphology of the crystalline material was found using both techniques to be predominantly the beta' form of triacylglycerols. The accelerated growth of such triacylglycerol morphology has been observed as a result of shear stresses in other studies involving edible fats. As a result of the findings of this study, it is proposed that increased shear forces may be responsible for the formation of the unusual fat structure found in the victim. An understanding of the effect of forces on the structure of body fat in high-impact collisions can potentially assist in verifying a high-velocity impact.     

丝绸之路经济带中的陕西文化先行战略研究

丝绸之路是一个有着悠久历史和深厚内涵的地域概念和文化载体,是中西文化交流的主要通道。丝绸之路经济带是沿线各国在新的时代背景下合作共赢的文化交流带和经济发展带。陕西是丝绸之路的起点,陕西文化元素是丝绸之路文化遗产的重要符号和典型代表。推动丝绸之路经济带建设,陕西应该采取文化先行战略,如出台文化发展规划与扶持政策,推动文化资源旅游的整合开发等。     

四川藏区道路交通管理面临的主要问题及应对措施——以阿坝州为视点

四川阿坝州道路交通管理面临的五个主要问题：一线民警数量与质量均存问题，警务运行机制改革有待深化，交管部门整体突发事件应急能力亟待提升，道路基础设施落后，执法环境有待改善。应对措施是：优先考虑民警向一线下沉、实施质量提升工程，整合基层单位、建立科学的值班备勤制度、推进电子警务，加强预案建设、提升突发事件预测和资源保障能力，提升道路规划层次．切实改善执法环境。