移动互联网背景下电子数据的取证审查初探

因电子数据有客观、稳定等特点,在刑事证据中扮演着重要角色。随着新刑事诉讼法将电子数据单独归类,在司法实践中,电子数据越来越得到刑事办案人员的重视。但不可否认的是,电子数据具有变化快、种类多、科技化等特点,尤其在当今的移动互联网时代,移动设备产生的电子数据越来越呈现出这种特点,并给取证方法、审查标准、采信规则等刑事司法实务带来困惑与矛盾,因而需要尽快加以解决和规范方法。     

录音设备识别司法鉴定技术研究

目标随着手机和录音笔等数字录音设备的普及,数字录音已基本取代传统的模拟录音,成为录音司法鉴定主导性检材类型。数字录音资料作为视听资料的重要组成部分,其真实性司法鉴定新技术新方法的研究具有重要的理论意义和实际应用价值。方法研究基于录音设备识别的数字录音真实性鉴定技术,通过数字录音背景噪声片段的提取,计算录音设备相关的关键统计特征,包括采样直方图分布特征和平均频谱统计特征,并使用机器学习和模式分类方法对数字录音的载体即录音设备进行准确分类。结果实验中最高的分类准确性达到97.09%。在录音设备可分性研究成果基础上,提出应用于数字录音设备司法鉴定的可行实施方案。结论研究结果表明了基于信号统计特征分析的录音设备识别方法的可行性和准确性。     

The Panglossian politics of the geoclique

ABSTRACT

Solar radiation management (SRM) – a form of geoengineering – creates a risk of ‘termination shock’. If SRM was to be stopped abruptly then temperatures could rise very rapidly with catastrophic impacts. Two prominent geoengineering researchers have recently argued that the risk of termination shock could be minimised through the adoption of ‘relatively simple’ policies. This paper shows their arguments to be premised on heroically optimistic assumptions about the prospects for global cooperation and sustained trust in an SRM deployment scenario. The paper argues that worst-case scenarios are the right place to start in thinking about the governance of SRM.     

Heat and let dye: Part II – Rapid heat-fixing of blood traces

Blood-contaminated shoeprints and footmarks contain valuable operational information as they may bind an individual who stepped in the crime scene with the incident and not merely with the location. As determining the age of a bloodstain remains a challenge, while processing the scene, it is difficult to determine whether the blood is completely, or partially, dry. Thus, executing a dye staining protocol may wash these marks away as they might still be soluble. However, to meet this challenge, it is possible to fix blood marks using heat. This study aims to find a solution for floor surfaces covered by heavier blood traces (shoeprints and footmarks). For this purpose, a new pseudo-operating device was constructed for examining the blood-fixing process of both mentioned trace types. Two trials were performed with depletion marks. The results revealed that fully developed fresh and heavily blood deposits were obtained by heating to 200°C for 7.5 min using the fixing device, followed by a staining protocol using amido black solution. The achieved sharp resolution of the examined bloody prints demonstrates that in certain cases the dehydration mechanism of heating is preferred over precipitating the proteins attributed to 5-sulfosalycilic acid; thus, reducing the risk of washing blood evidence while processing the crime scene.     

影响城市电磁辐射环境质量的主要污染源

主要介绍影响城市电磁辐射环境质量的几个主要污染源及造成影响的原因.     

Noise Trauma Induced by a Mousetrap—Sound Pressure Level Measurement of Vole Captive Bolt Devices

Abstract: While ballistic parameters of vole captive bolt devices have been reported, there is no investigation on their hazardous potential to cause noise trauma. The aim of this experimental study was to measure the sound pressure levels of vole captive bolt devices. Two different shooting devices were examined with a modular precision sound level meter on an outdoor firing range. Measurements were taken in a semi‐circular configuration with measuring points 0° in front of the muzzle, 90° at right angle of the muzzle, and 180° behind the shooting device. Distances between muzzle and microphone were 0.5, 1, 2, 10, and 20 m. Sound pressure levels exceeded 130 dB(C) at any measuring point within the 20‐m area. Highest measurements (more than 172 dB[C]) were taken in the 0° direction at the 0.5‐m distance for both shooting devices proving the hazardous potential of these gadgets to cause noise trauma.     

Identification of Bodies by Unique Serial Numbers on Implanted Medical Devices

Visual identification is the most common identification method used by medical examiners but is not always possible. Alternative methods include X‐ray, fingerprint, or DNA comparison, but these methods require additional resources. Comparison of serial numbers on implanted medical devices is a rapid and definitive method of identification. To assess the practicality of using this method, we reviewed 608 consecutive forensic autopsies performed at a regional medical examiner office. Of these, 56 cases required an alternative method of identification due to decomposition (n = 35), gunshot wound (n = 9), blunt trauma (n = 6), or charring (n = 6). Of these 56 cases, eight (14.3%) were known to have an implanted medical device. Of these eight cases, five (63%) could be positively identified by comparing serial numbers. If an implanted medical device is known to be present, and medical records are available, identification by medical device serial number should be a first‐line method.     

The study and forensic significance of drill bit use indicators

Abstract:  A case study involving an improvised pipe bomb with a drilled fuse hole is presented. This case study and its accompanying research details drill bit use and/or nonuse indicators. These indicators are then further classified to develop relevant conclusion criteria. These criteria are: (1) trace deposits in the form of particulate and/or smears on the drill bit, especially inside the flute and the tip area, (2) physical damage including chipping, abrasion, and fissuring on the drill bit which mostly occurred on the flute edge bevels and lip edges, and (3) thermal damage. One or any combination of these indicators could be used as effective criteria for concluding drill bit usage. This study also determined that a drill bit produces well-defined toolmarks on swarf shavings that could be identified back to that particular tool, and there is no mechanical break-in period for obtaining reproducible toolmarks on newly manufactured or unused bits.     

遥控类爆炸装置的爆炸残片分析

目的为了推断遥控爆炸犯罪案件中所制作的遥控爆炸装置种类;方法首先制作常见的两类共3种遥控爆炸装置,进行爆炸实验;接着通过对爆炸残片的检验,研究各种遥控爆炸装置的爆炸残片特征;结果在不多于400克药量的常见炸药爆炸后,3种遥控爆炸装置爆炸后都可以在现场收集到大多数的爆炸装置残片可供检验;结论通过对爆炸残片的特征检验,基本上可以推断遥控爆炸装置的种类与外包装的种类,以及是否使用电池电源。     

室内地板辐射采暖——一种高效节能的室内采暖技术

介绍了室内地板辐射采暖技术 ,并将地板辐射采暖与普通的暖气片采暖在性能、造价等方面进行了比较 ,说明新型室内地板辐射采暖技术的普及势在必行。