Tool mark striations in pig skin produced by stabs from a serrated blade

Stab wounds produced by serrated blades are generally indistinguishable from stab wounds produced by non-serrated blades, except when visible tool mark striations are left on severed cartilage. Using a pig-skin experimental model, we explored the possibility that similar striations may be left in skin. Stabs into pig skin were made using a straight spine coarsely serrated blade (121), a drop point finely serrated blade (20), a clip point irregular coarsely serrated blade (20), a drop point coarsely serrated blade (15), and as controls 2 non-serrated blades (40). Tool mark striations could be seen on the skin wall of the stab canal in all stabs made using serrated blades but in none with non-serrated blades.The striation pattern, reflecting the class characteristics of the serrated blade, was the same as that described in cartilage but less well defined. Fixation of the specimen with Carnoy's solution best preserved visible striations, and fixation with formaldehyde after staining with 5% Neutral Red was also satisfactory. Casting with vinyl polysiloxane dental impression material greatly facilitated photo-documentation. Applying the technique to homicidal stabbings may help identify stab wounds produced with serrated blades.     

Similar skin lesions in victim and perpetrator caused by a knife with a serrated blade

Reported in this paper is an attack of two adolescents on a man who was killed in the fight, with several kitchen knives being used, including two with grooved and wave-grooved blades. One of the offenders held the victim tight from behind and was injured by his attacking accomplice++. A grid mark on the left side of the victim's face and the left forearm of the second offender in the back supported the assumption of a knife with simple wave profile. Skin lesions of finer structure below the left ear and on the left forearm of the victim suggested involvement of a smaller kitchen knife with groove-milled wave profile. Offender-victim position and course of offence were verified and confirmed by evaluation of these specific findings.     

Calcification and ossification in the arytenoid cartilage: incidence and patterns

Calcification or ossification occurs early and commonly in the arytenoid cartilage. It may be difficult to detect, but there are only eight patterns that specifically identify ossification and calcification. Each arytenoid independently ossifies or calcifies. The cervical spine examination can specifically identify the patterns found at autopsy.     

An experimental model of tool mark striations in soft tissues produced by serrated blades

Stab wounds produced by serrated blades are generally indistinguishable from stab wounds produced by non-serrated blades, except when visible tool mark striations are left on severed cartilage. We explored the possibility that similar striations may be produced on the soft tissues of internal organs. Loin of beef, bovine kidney, and pig heart, liver, and aorta were each stabbed 20 times with a coarsely serrated blade. The walls of the stab tracks were exposed and documented by photography, cast with dental impression material, and the casts photographed. Striations were identified in all of the tissues in every stabbing, but their consistency and quality varied between tissues. Striations were most easily seen in liver, heart, and aorta. Tool mark striations in soft tissues other than cartilage have not been described in homicidal stabbings, likely because they have not been sought. We suggest that the walls of stab wound tracks should be exposed, and tissue striations should be sought as a means of identifying the weapon as having a serrated blade.     

Forensic medical characteristics of stab wounds caused by objects differing in the blade sharpness

Based on the results of the present experimental study, morphological and histological criteria for incised skin wounds from objects differing in the blade sharpness were developed.     

The establishment of the features of the blade of a stabbing-cutting weapon by the damages to human skin and to tricot clothing]

Presents forensic medical characteristics of the specific features of stabbed and cut injuries of human skin and jersey. Suggests a complex of signs that will help determine some structural parameters of a knife blade and the conditions of its interaction with the injured site of human body.     

Explaining differences in sub-national patterns of clean technology transfer to China and India

The Kyoto Protocol’s Clean Development Mechanism (CDM) has the capacity to incentivize the international transfer of environmentally sound technologies. Given that both countries are expected to have similar incentives when managing the distribution of technology transfer within the country, why do sub-national patterns in the allocation of projects with technology transfer differ? Using comparable political–economic data compiled for China and India, we offer an explanation for these differences. In China, where the government regards the CDM as a tool for achieving sustainable development, technology transfer is concentrated in provinces that need it the most and that are most conducive to receiving transfers (i.e., economically less developed, yet heavily industrialized provinces). In India, where the government takes on a “laissez-faire” approach to the CDM, neither level of economic development nor that of industrialization affects clean technology transfer. In this regard, although the incentives are similar, the capacity to pursue them is not comparable. We test these hypotheses using data on CDM technology transfer across Chinese provinces and Indian states during the 6-year period from 2004 to 2010.     

Long-term marriage patterns in the United States from colonial times to the present

Marriage in colonial North America was notable for being early (for women) and market by low percentages never marrying. This was different from the distinctive northwest European pattern of late marriage and high proportions never married late in life. But the underlying neolocal family formation behavior was the same in both colonial North America and the areas of origin of this population. Thus, Malthus was correct. Abundant resources rather than basic behavioral differences made early and extensive marriage possible in the colonies. Between 1800 and the present there have been long cycles in nuptiality. Since about 1800, female age at first marriage rose from relatively low levels to a peak around 1900. Thereupon a gradual decline commenced with a trough being reached about 1960 at the height of the baby boom. There then began another, and rapid, upswing in female marriage age. Proportions never married at ages 45–54 replicated these cycles with a lag of about 20–30 years. Since 1880 (when comprehensive census data become available), male nuptiality patterns have generally paralleled those of women. Male marriage ages were higher than those of females with proportions never marrying also usually higher. Considerations of differentials by race and ethnicity are important in looking at the American experience over time. Ages at marriage in the black population have, for example, moved from being lower to being higher than those for whites. More work is needed in the period 1800 to 1880 when we lack comprehensive census data, vital records, and other data sources.     

Virtual casting of stab wounds in cartilage using micro-computed tomography

In homicidal stabbings using a serrated knife, stab wounds involving costal cartilage leave striations on the cut surface of the cartilage from the serration points on the blade edge. Class characteristics of the serrated blade can be determined from the striation marks, and individualizing characteristics may be seen also. The traditional method for recording the striation marks involves the pernickety technique of casting with dental impression material. We assessed the potential utility of micro-computed tomography scanning of the stab track as a technique for nondestructive recording of striation patterns and virtual casting of them. Stab tracks in porcine cartilage, produced with a coarsely serrated blade, were scanned with a bench-top micro-computed tomography scanner. The typical irregularly regular striation pattern could be demonstrated, and the images manipulated, using proprietary software to produce a virtual cast. Whether the technology will have sufficient resolution to image not only class characteristic tool marks but also the much finer individualizing tool marks remains to be evaluated, but the technology shows considerable promise.     

Crime change patterns in American cities

A longitudinal analysis of the changes in crime rates between the late 1950s and 1970 in the 155 largest U.S. cities indicates that (1) there is virtually no relationship between the four major crimes against persons although there is strong mutual association between the four major crimes against property; (2) changes in racial composition account for more variation in changes in crime than do changes in income, thereby suggesting the need for more detailed studies of the noneconomic ways in which a city's racial composition affects crime incidence; and (3) there is a modest relationship between changes in the number of male youth and changes in certain types of crime. Since these findings are based on highly aggregated data with both known and unknown measurement errors, they must be treated cautiously.     

Unusual blunt force wound patterns due to a hexagonal steel bar

Pathologists routinely examine victims with blunt force traumatic injuries. Many of these victims exhibit injury patterns that can help identify the weapon used in the assault. Proper documentation that accurately portrays the injury pattern and allows for comparison with recovered weapons is therefore essential. Our office investigated a homicide with unusual blunt force injuries. This article presents the procedure that we followed to identify the weapon.     

Injury patterns in motor vehicle fatalities

A retrospective pilot study of motor vehicle incident fatalities was conducted to determine what relationships exist between injuries received by deceased drivers, passengers, and a control population of pedestrians, and some of the environmental factors existing at the time of the incident. A number of correlations were established between the types and locations of injuries received, seat belt use, position of the injured party, and so forth. A study of this type, if performed on a large enough population, could lead to predictive models for the determination of position of the victims within a motor vehicle at the time of a fatal crash, based on a unique clustering of injuries.     

Modernization and crime patterns in China

Existing research on modernization and crime patterns largely focused on the volume of crime and its variation over periods of modernization. The empirical studies predominantly used cross-national data based on Western advanced capitalist societies and developing countries. To further discover patterns of crime during the modernization process in non-Western settings, the present study took a different approach. It examined the rate of change for property and violent crimes in China; and it employed longitudinal methods to analyze the crime series. The findings extended the conclusions of modernization theories regarding general crime patterns during modernization. Theoretical implications of the findings are discussed.     

中国汉族成人甲状软骨的性别判定

目的 建立中国汉族成人甲状软骨性别判别的函数方程。方法 对142例中国汉族成人甲状软骨(男73例,女69例)进行大体测量,选择7个性别差异非常显著的测量指标,然后采用Fisher判别分析法和Bayes逐步判别分析法,建立判定甲状软骨性别的系列判别函数。结果 建立了13个甲状软骨的性别判别方程,完整或大部分完整的甲状软骨性别判别准确率均达100％,残缺的达90％。结论 中国汉族成人甲状软骨性别差异明显,运用所建方程能够判定甲状软骨的性别。     

From rehabilitation to retribution: Examining public policy paradigms and personnel education patterns in corrections

The literature is saturated with discussions of how public policy paradigm shifts over the past several decades have affected everything from escalating prison populations to accelerating tax burdens. However, observers have not examined whether the transition from the medical model to the justice model has influenced the educational qualifications of custodial staff. Theoretically, one might assume that a treatment focus demands higher educational standards than a control orientation. The evidence presented herein largely refutes that assumption. In addition, there is some doubt as to whether advancing educational achievements will continue. Reasons for the dissonance between public policies and the educational credentials of line-level operational personnel are discussed, along with potential future implications.     

Assessing network patterns in illegal firearm markets

This study presents the results from a qualitative survey of 20 incarcerated and nonincarcerated illicit firearm market consumers in Quebec. Its general aim is to identify key acquisition patterns for illegal firearms. The interview sessions confirmed several general patterns emerging from past research. Illegal firearm acquisitions generally took place through informal channels. Opportunistic transactions were prevalent across all respondents’ experiences. The presence of key point sources were discussed across the interviews, but to a much lesser extent than the high volume of friends, family members, and close contacts who were more likely to supply firearms. Point sources, and particularly those operating off Native reserves near Montreal, were also more difficult to access for inexperienced acquirers. That such reputed suppliers were not as prevalent across respondents’ experiences was not simply due to the difficulties to access them, but largely because respondents were already well exposed to a variety of channels for acquiring firearms. An analysis of respondents’ personal networks revealed that only a few respondents had closed networks that were limited in suppliers and that most were able to acquire illegal firearms through open or brokered networks that put them into contact with a multitude of suppliers (in open networks) or a reliable set of intermediaries (in brokered networks). This was the case for both free and incarcerated respondents in the sample. That open and brokered networks were more prominent suggests that even if key point sources are removed from the market by law-enforcement efforts, consumers will be able to adjust rather quickly by turning to any of the channels that are accessible to them.     

公立医院改制模式探讨

为了着力解决我国目前“看病难、看病贵”的突出问题,实现WHO提出的卫生改革和发展目标,2009年我国医疗改革意见提出对公立医院进行改革试点,坚持公立医疗机构为主导、非公立医疗机构为补充的办医原则。本文主要探讨公立医院改制模式的三种形式：自主化模式、公司化模式以及民营化模式。