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An Empirical Study on the Relation Between the Critical Angle for Bullet Ricochet and the Properties of Wood 下载免费PDF全文
Wim Kerkhoff Ivo Alberink Ph.D. Erwin J.A.T. Mattijssen M.Sc. 《Journal of forensic sciences》2015,60(3):605-610
The properties of a bullet, an object, and the incidence angle determine whether the bullet will penetrate, perforate, or ricochet. In this study, the critical angle for ricochet was established for .32 Auto and 9 mm Luger bullets on Abachi, Southern Yellow Pine, Beech, and Ipe wooden boards. Results show that the critical angle differs depending on caliber and wood type. The critical angle is higher for .32 Auto bullets than for 9 mm Luger bullets and increases with increasing wood density and Janka hardness. The established critical angles for ricochet on the lightest and softest wood (Abachi) are 10.4° and 10.3° for .32 Auto and 9 mm Luger, respectively. For the heaviest and hardest wood (Ipe), the angles were 45.0° and 33.4°, respectively. The combined results on the four tested woods show a strong linear relationship between both the density and the hardness and the critical angle for both calibers. 相似文献
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Yekkala R Meers C Van Schepdael A Hoogmartens J Lambrichts I Willems G 《Forensic science international》2006,159(Z1):S89-S94
The estimation of chronological age in cadavers, human remains and in living human beings by various methods is discussed. These methods, which are based on the age dependent non-enzymatic changes of l-form amino acids to d-form amino acids, mainly aspartic acid, are among the most reliable and accurate methods to date. Most of these methods use gas chromatography (GC). In this review, results of aspartic acid racemization in dentin at different targets are discussed. In addition, pre-considerations and guidelines are given for the selection of dentin from teeth. A pilot project was run to evaluate the efficiency of high performance liquid chromatography (HPLC) coupled with fluorescence detection. New buffer conditions were found to obtain stable derivatives of aspartic acid enantiomers for the estimation of racemization. 相似文献
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Many of the most significant challenges in health care—such as smoking, overeating, and poor adherence to evidence‐based guidelines—will only be resolved if we can influence behavior. The traditional policy tools used when thinking about influencing behavior include legislation, regulation, and information provision. Recently, policy analysts have shown interest in policies that “nudge” people in particular directions, drawing on advances in understanding that behavior is strongly influenced in largely automatic ways by the context within which it is placed. This article considers the theoretical basis for why nudges might work and reviews the evidence in health behavior change. The evidence is structured according to the Mindspace framework for behavior change. The conclusion is that insights from behavioral economics offer powerful policy tools for influencing behavior in health care. This article provides public administration practitioners with an accessible summary of this literature, putting these insights into practical use. 相似文献
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Erwin J. A. T. Mattijssen M.Sc. Ivo Alberink Ph.D. Suzanne D. Brouwer M.Sc. Wim Kerkhoff 《Journal of forensic sciences》2016,61(3):765-772
When a bullet ricochets from wood, various parameters will influence its behavior. In this study, the influence of the wood grain on the ricochet angle (β) and deflection angle (γ) is assessed. Series of five .32 Auto bullets were fired at different angles of incidence (α) on boards of six wood types. The results confirm the previously shown effect that the mean β‐angles usually exceed α and increase when α increases. Overall, the maximum mean γ occurs when the angle of wood grain (ζ), in relation to the plane of impact, lies between 30° and 75° but differs per combination of wood and α. The results show the inclination of γ toward the left or right, depending on the bullets left or right rotation while also showing that the direction of ζ can enhance or counteract this effect considerably, especially when α is close to the critical ricochet angle. 相似文献
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Martin Janík M.D. Ph.D. Petr Hejna M.D. Ph.D M.B.A. Michaela Ublová M.D. Ivo Šteiner M.D. Ph.D. 《Journal of forensic sciences》2017,62(2):515-518
Multiple giant aneurysms involving the coronary arteries are uncommon and rarely reported. In the presented case, a 63‐year‐old man with poorly controlled hypertension died suddenly. Gross autopsy examination showed multiple giant thrombus‐filled coronary artery aneurysms, atherosclerotic coronary artery disease, and cardiomegaly. Histological sections of the coronary aneurysms showed atherosclerotic changes with both organized and fresh thrombus. Giant coronary aneurysm is defined as a segmental enlargement of a coronary artery with a diameter exceeding 20 mm or more. The main etiology of this nebulous entity is attributed to atherosclerosis and inflammatory or inherited connective tissue disorders with the remainder being congenital, infectious, or idiopathic. Before its cataclysmic presentation, when ruptured or thrombosed, giant coronary aneurysm usually has a silent clinical course. Sudden death owing to giant multiple coronary aneurysms is rare and mandates careful classification of the aneurysms and prudent search for autoimmune‐mediated or genetically based factors for subsequent ancillary autopsy studies. 相似文献
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In this article we present, discuss and try to evaluate initiatives which were recently introduced into the Belgian criminal justice system, aimed at the development of creative answers to crime that avoid the use of traditional prison sentences. We decided to focus this analysis on the practice of mediation as it is actually considered the most innovative approach to the crime problem. Mediation as a problem-solving intervention has to be considered in direct relation to the discussion of the purpose of the criminal justice system. By putting the emphasis on the dialogue between the victim and the offender, a common solution is worked out with the help of a mediator. In this way reparation, redress and sometimes even reconciliation become core values of the penal action. 相似文献
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The European Forum for Victim–Offender Mediation and Restorative Justice is a non-governmental organisation set up because European victim–offender mediation projects had seldom established contacts beyond national borders. Informal contacts revealed that practitioners, academics and policy makers were looking for a more regular exchange and mutual support in developing victim–offender mediation and other restorative justice practices. This article gives an overview of the background to restorative justice and victim–offender mediation, and pays attention to the development of the Forum, its current aims, objectives and activities, and other (policy) developments at a supranational level. 相似文献
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As part of the Forensic Ear Identification (FearID) research project, which aims to obtain estimators for the strength of evidence of earmarks found on crime scenes, a large database of earprints (over 1200 donors) has been collected. Starting from a knowledge-based approach where experts add anatomical annotations of minutiae and landmarks present in prints, comparison of pairs of prints is done using the method of Vector Template Matching (VTM). As the annotation process is subjective, a validation experiment was performed to study its stability. Comparing prints on the basis of VTM, it appears that there are interoperator effects, individual operators yielding significantly more consistent results when annotating prints than different operators. The operators being well trained and educated, the observed variation on both clicking frequency and choice of annotation points suggests that implementation of the above is not the best way to go about objectifying earprint comparison. Processes like the above are relevant for any forensic science dealing with identification (e.g., of glass, tool marks, fibers, faces, fingers, handwriting, speakers) where manual (nonautomated) processes play a role. In these cases, results may be operator dependent and the dependencies need to be studied. 相似文献