Personal identification of cold case remains through combined contribution from anthropological, mtDNA, and bomb-pulse dating analyses

In 1968, a child's cranium was recovered from the banks of a northern Canadian river and held in a trust until the "cold case" was reopened in 2005. The cranium underwent reanalysis at the Centre for Forensic Research, Simon Fraser University, using recently developed anthropological analysis, "bomb-pulse" radiocarbon analysis, and forensic DNA techniques. Craniometrics, skeletal ossification, and dental formation indicated an age-at-death of 4.4 ± 1 year. Radiocarbon analysis of enamel from two teeth indicated a year of birth between 1958 and 1962. Forensic DNA analysis indicated the child was a male, and the obtained mitochondrial profile matched a living maternal relative to the presumed missing child. These multidisciplinary analyses resulted in a legal identification 41 years after the discovery of the remains, highlighting the enormous potential of combining radiocarbon analysis with anthropological and mtDNA analyses in producing confident personal identifications for forensic cold cases dating to within the last 60 years.     

Correlation between saw blade width and kerf width

Most studies of saw marks have focused on morphological characteristics and their utility in identifying saws suspected to have been utilized in cases of criminal dismemberment. The present study examined the extent to which metric analysis may be used to correlate saw blade measurements with minimum kerf widths (MKWs). A sample of 56 partially defleshed white‐tailed deer (Odocoileus virginianus) long bones was utilized as proxy for human remains. The long bones were cut using a variety of commercially available saws, including 11 manual‐powered and 5 mechanical‐powered saws. A total of 496 false start kerfs (FSKs) were created. Two experiments were performed, with the first test examining the MKWs of FSKs produced on specimens that were restrained using a bench vise, while the second test analyzed the MKWs of FSKs produced on minimally restrained specimens. Statistical analysis using Hierarchical Linear Modeling (HLM) indicated a positive relationship between saw blade width (mm) and MKW, with blade width (p < 0.001) and the overall difference between the mechanical‐ and manual‐powered saws (p = 0.029) tested, reaching statistical significance. A comparison of MKWs produced using manual‐powered saws on restrained and minimally restrained bones suggests that restraint condition (p = 0.009) has a statistically significant effect. In comparisons of MKWs to blade widths, the average ratio for mechanical‐powered saws is 18.7% greater than the average ratio for manual‐powered saws. While the mode of the ratios was 1.42, thus supporting the general rule that MKW does not exceed 1.5 times blade width, multiple individual ratios did surpass 1.5.     

脉象地形图初探

脉诊是中医诊病取之以象的典型方法,所取之象即为脉象,具有多维、多变的特性。实现脉象信息的充分表达是近现代脉诊研究的重点与难点。脉象地形图的构建应基于分析传统脉象的特性,总结脉诊客观化研究的经验,以及借鉴生物医学领域应用地形图的思路与方法。     

体检人群肝脂肪病变者中医脉象信号的递归定量识别与分析

目的 运用研究非线性动力学的递归定量分析（recurrence quantification analysis,RQA）方法对体检人群肝脂肪病变者的脉象信号进行分析,探讨脉象信号非线性动力学特征对肝脂肪病变的识别价值。方法 运用ZY-I型脉诊仪采集体检人群的脉象信号,根据腹部超声报告将体检人群分为肝脂肪病变组和非肝脂肪病变组;提取体检人群脉象信号RQA特征,并运用非参数检验分析两组人群脉象信号的RQA特征差异;基于脉象信号RQA特征,运用随机森林算机器学习方法建立体检人群肝脂肪病的识别模型,并通过评价准则包括准确率、精确率、召回率、F1值、受试者工作特征曲线（receiver operating characteristic curve,ROC）及曲线下面积（area under the curve of ROC,AUC）评估模型识别性能。结果 肝脂肪病变组脉象信号RQA特征RR、DET、L、ENTR、LAM、TT、Vmax均高于非肝脂肪病变组（P＜0.05）;基于脉象信号RQA特征建立的体检人群肝脂肪病变识别模型,其准确率为80.34％、精确率为82.166％、召回率为86.000％、F1值为84.039％、AUC为86.774％。结论 与非肝脂肪病变组相比,肝脂肪病变组的脉象信号系统表现出更高的规律性、确定性、稳定性,基于RQA特征建立的体检人群肝脂肪病变识别模型能较好地区分肝脂肪病变组与非病变组的脉象信号,可为肝脂肪病变的早期预警及辅助诊断提供一定的临床参考。     

Relative Width and Height of Handwritten Letter

This is an exploratory study that analyzes the width and the height of letters in two texts written by each of the 21 writers analyzed. After detrending the linear, text, and allograph trends, we proceeded to comparing the sizes obtained in different texts. The different detrended series were compared by means of correlation and t‐test. According to the results regarding the width of letters, the texts of 19 of 21 writers correlated strongly, whereas the texts of two writers did not correlate with the limits of the threshold. With regard to the height of letters, texts written by between 18 and 21 writers of 21 writers correlated strongly, whereas texts that did not correlate were within the threshold value. Regarding both the width and the height of letters, of 21 writers, texts written by between 19 and 21 individuals were found to correlate strongly.     

侦查阶段引入刑事和解与调解机制探析

侦查阶段引入刑事和解与调解机制有利于保护受害人的权益，能够及时有效地化解矛盾与促进和谐。在侦查阶段引入刑事和解与调解机制尚无法律的授权，但各地公安机关早已开始了对刑事和解与调解机制的实践。因此存在适用范围不确定、操作程序不规范、监督机制不完善等问题。为规范侦查阶段刑事和解与调解制度，应科学确定刑事和解与调解的适用范围，合理规范刑事和解的条件与刑事调解的程序，建立健全刑事和解与调解的监督机制。     

Mouth Width and Cupid’s Bow Estimation in a Southern African Population

Standards for estimating mouth width and Cupid’s bow width in craniofacial approximation and superimposition are limited. Currently, the only guideline for mouth width, using direct skeletal references, is a general rule indicating a 75% inter-canine to mouth width ratio. The philtrum, which closely corresponds to the Cupid’s bow, is said to be equal to the inter-superior prominences of the maxillary central incisors. This study tested these guidelines against newly generated regression models and mean values. Cone-beam CT scans of 120 black and 39 white southern African adults were used. Comparative hard and soft tissue measurements were taken using a 3D DICOM viewer. Regression equations accounting population, sex, and approximate age variables (20–39 and 40+ years), utilizing maxillary inter-canine width to estimate mouth width and maxillary central–lateral incisor junction width to estimate Cupid’s bow width, performed statistically best. The regression models were more reliable than existing standards in validation tests.     

开关电源中脉宽调制原理与实践探讨

本文论述了开关电源的自激振荡和脉宽调制的工作原理,就其稳压的关键提出了新的观点;并针对维修中的难点提供了明确的思路和有效的方法.     

根据足迹掌宽值推断体重公式的修正计算

目的为提高实战中对留痕人体重推断的准确率;方法根据足迹长宽的比值更能准确地反映人的胖瘦这一规律,提出修正计算公式m=2.5M/R进行初步实验检验;结果该方法是对原根据足迹掌宽值推断留痕人体重公式的补充,对偏离标准体态的人,用该公式修正使足迹掌宽值与体重的关系有了较为准确的反映。     

纸上静态签名笔迹动态特征的提取和分析

目的建立一种新型的定量化签名笔迹鉴别技术。方法建立签名笔迹样本库，导入计算机后，提取签名笔迹的宽度，灰度和弧度等动态特征数据，进行时间归整后，比较签名动态特征之间的相关系数及其规律。结果同一人签名的动态特征之间相关系数高，而与代签签名、临摹签名和套摹签名均有显著差异。结论本研究开发和建立了一整套检测、提取和分析纸上签名笔迹动态特征的工具和方法，该方法能有效鉴别本人签名和非本人签名。