Improved Area of Origin Estimation for Bloodstain Pattern Analysis Using 3D Scanning

An important component of crime scene reconstruction is bloodstain pattern analysis (BPA). Where BPA concerns impact patterns, estimating the area of origin is critical information for scene reconstruction. Traditionally, this is achieved by measuring individual bloodstains and performing trigonometric calculations; however, 3D scanning has been proposed as a viable alternative for overcoming logistical and practical concerns with the manual method. Therefore, this project aimed to establish whether the FARO Focus 3D scanner and FARO Zone 3D software can improve the accuracy of area of origin estimates relative to the manual method. We created a series of eight bloodstain impact patterns and performed paired analysis using the two methods to estimate areas of origin for each pattern. Our data suggested that FARO-derived estimates were generally more accurate than using the manual method. FARO-estimated heights of origin areas were generally closer to the true distance. Both methods underestimated the distance from the wall for most patterns originating 150mm or greater from the wall, but overestimated distances for patterns originating closer to the wall. The degree to which distances were underestimated increased significantly the further the blood source was from the wall and was greater for FARO-derived estimates. The results of this research contribute to the validation of these instruments for operational implementation for BPA and should be considered alongside the practical benefits of 3D scanning relative to manual methods. Further, 3D scanning can provide reliable BPA reconstruction documentation for technical review and court presentation.     

大治安格局的理念与全新的工作方式

大治安格局是以指挥中心为龙头,以社区警务建设为基础,以强化社会控制为手段,以公安科技建设为保障,各警种和社会力量广泛参与,采取专群结合,打防结合,动静结合,点线面结合,人防、物防、技防等方式方法,形成集预防、发现、打击犯罪等功能于一体的社会治安防控的大治安格局。     

浅谈跨学科交叉培养模式的优势与构建

为了适应 2 1世纪现代化建设对高等教育教学改革和人才培养的要求 ,实现素质教育的目标 ,构建跨学科的交叉培养模式具有重要意义。构建跨学科交叉培养模式主要是构建课程式和专业式两种交叉培养模式。     

火灾发生起数的区间估计和假设检验

在分析火灾发生概率规律性的基础上,可在一定的置信水平上,对火灾发生的起数进行区间估计和假设检验。通过区间估计将未来的火灾形势预测为一个置信区间,通过假设检验可排除随机干扰,确定火灾发生起数的变化规律,这些信息都能为消防规划的制定提供科学的数量依据。     

按势分配与社会公正：乡镇煤矿背后的利益关系——以湖南塘镇为例

利益分配是考察社会公正与和谐社会建设的一个视角.基于湖南塘镇乡镇煤矿背后的矿主、矿工、村组、基层政府及各相关部门、红黑恶势之间利益关系的考察发现,乡镇煤矿背后存在着按势分配的两端:一端是在井下漆黑世界劳作的外地农民矿工,另一端则是一些握有权杖的腐败官员或依仗暴力的社会混混.这样一种按势分配的利益格局对社会公正形成了强烈的挑战.我国目前收入分配差距过大的原因,主要不在于市场化,而在于制度不健全所导致的腐败和灰色收入.     

鸡白细胞介素-2受体基因γ链的转录分析与表达

以脾单个核细胞总RNA为模板,对鸡白细胞介素-2受体基因γ链(chIL-2Rγ)进行了RT-PCR,获得了一1 047 bp的开放阅读框,编码由348个氨基酸残基组成的分子质量为37.8 ku的蛋白多肽。预测的鸡IL-2Rγ多肽链中包含4个保守半胱氨酸残基、1个WSXWS基序和7个N连接的糖基化位点。鸡IL-2Rγ与其他动物IL-2Rγ在氨基酸水平上的同源性仅为21.4%~38.2%。RT-PCR检测发现,鸡IL-2RγmRNA分布于大脑、小脑、脊髓、腔上囊、脾、胸腺、骨髓、盲肠扁桃体、腺胃、肌胃、空肠、卵黄囊憩室、回肠、盲肠、直肠、心脏、肾、肺、肝、骨骼肌和皮肤,而在十二指肠和睾丸中没有检测到其转录。构建了鸡IL-2Rγ胞外区的原核重组表达载体,进行了表达和鉴定。     

论我国现行立法背景下的物权变动模式

物权的变动模式作为物权法的重要内容,一直是学界讨论的热点。如何正确认识我国现行立法背景下的物权变动模式,对于未来物权立法能否选择一个既与国际接轨又适合我国国情的物权变动模式,有着重要的意义。笔者认为,我国现行法规定的物权变动模式,虽非债权意思主义,但也绝不是学界通说的债权形式主义,而是一种特有的模式——物权意思主义。     

High performance liquid chromatographic determination of alcohols with reference to body distribution of methanol

A method has been developed on reverse phase high performance liquid chromatography for simultaneous determination of methyl, ethyl and isopropyl alcohols under refractive index detection using pure water as the mobile phase. A good separation has been achieved between these alcohols. Detector response was linear with a detection limit of 5 mg/100 ml. Recovery studies were performed by adding known amounts of methyl and ethyl alcohols to blood, lung and liver within the range 80–90%. The reproducibility of the results was always >90%. The quantitative distribution of methyl alcohol in postmortem body tissues and fluids has been reported in three cases of poisoning.     

从收入分配角度看中国的贫困问题

中国目前的贫困问题是经济发展问题和收入分配问题的综合表现.收入分配问题主要体现在以下三个层面:区域之间的收入分配公平问题;城乡之间的收入分配公平问题;不同收入阶层之间的收入分配公平问题.我国不公平的资源所有权格局引起了收入不公平的分配.解决收入分配涉及市场经济体制和政府对社会财富的分配体制两大类.必须把"统筹"作为解决收入分配问题的着力点.     

警务化管理与学生的个性发展--由毕业生写给母校的一封信引发的思考

某省公安院校一位毕业生写信给母校 ,指责学校警务化管理体制抑制了学生的个性发展。其实只要从素质教育理念出发 ,警务化管理与学生个性发展并不矛盾 ,它与学生的个性发展可以并行不悖。抑制学生个性发展的呼声实际上是公安院校就业难的侧面反映。