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51.
Quantifying Uncertainty in Estimations of the Total Weight of Drugs in Groups of Complex Matrices: Using the Welch–Satterthwaite Equation
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Ivo Alberink Ph.D. Annette Sprong B.Sc. Annabel Bolck Ph.D. Peter Vergeer Ph.D. 《Journal of forensic sciences》2017,62(4):1007-1014
In this paper, a method is described to quantify estimations of the total amount of drugs in groups of seized items, including quantification of the precision. Previous work on this topic was based on the assumptions of normally distributed measurements and grouping of items with a common relative standard deviation. In practice, these assumptions are often violated, for example, for data with point masses at 0, or if certain items in a group have a very high standard deviation. The method described in this paper is based on work by Welch and Satterthwaite and does not assume constant relative standard deviations. Case examples are described for which the method is applied, and simulation studies are carried out for which both methods are applied. In the cases, both methods perform reasonably well. If the assumption of common relative standard deviations clearly does not apply, it is advised to use the method described. 相似文献
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Annette Thierauf Frank Musshoff Burkhard Madea 《Forensic Science International Supplement Series》2009,192(1-3):78-82
For several decades vitreous humor has been used for post-mortem biochemical investigations with the objective of a post-mortem diagnosis of pre-existing diseases and the clarification of forensic issues, in particular the determination of the post-mortem interval. For the determination of measured concentrations in vitreous humor pre-analytic factors as well as analytical and instrumental variations have to be taken into consideration. The aim of this study was a methodical investigation of two methods of sample pre-treatment as influencing variables. The compared methods were centrifugation and treatment in the ultrasonic bath. The determined parameters were sodium, potassium, chloride, calcium, lactate, urea, glucose and creatinine. Analyses were performed photometrically or by an ion-selective electrode. For some of the analytes a dilution was necessary before analysing. Regarding to the two pre-treatment methods, significant differences in the measured concentrations were not found. The precision proved to be mostly unsatisfying and was clearly better in diluted samples than in undiluted aliquots. A comparison of the vitreous humor of the two ocular bulbs did not lead to significant differences. 相似文献
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An important strand in the literature has stressed the analytical distinction between the Muslim Brotherhood's brand of Islamism and the Salafist movement. This article examines the shifts that have occurred within these two movements in Egypt since the Arab Spring. It specifically asks whether approximations between them in terms of strategies of actions have been paralleled by ideological approximations. The article argues that both movements have seen increased diversification which has—especially at the fringes—involved a reshaping of identities and ideological approximations that may facilitate cooperation between segments of these movements in the future. 相似文献
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Talking Cop: Discourses of Change and Policing Identities 总被引:1,自引:0,他引:1
This paper presents empirical and theoretical analysis of the enactment of New Public Management (NPM) within the UK police service. It draws on empirical material gathered in a two-year study that explores the ways in which individual policing professionals have responded to, and received, the NPM discourse. Theoretically informed by a discursive approach to organizational analysis, the paper focuses on the new subject positions promoted within NPM that serve to challenge traditional understandings of policing organization and identities. The paper examines the implications of this for policies that promote community orientated policing (COP) and increased inter-agency partnership. The paper argues that the promotion of a more progressive form of policing, based on community orientation and equality principles, may struggle to gain legitimacy within the current performance regime that legitimizes a competitive masculine subjectivity, with its emphasis on crime fighting. 相似文献
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With a special focus on social services, the article discusses the topic of convergence versus path dependency of state welfare arrangements in the US and Germany. In both countries, social services cover a broad spectrum of activities. In the US as well as in Germany, these services are to a large extent provided by non-profit organisations, although the two countries belong to very different welfare regimes. With a special eye on social services, the article provides an overview of the history of the two welfare states; it refers to current developments, of which the shift towards private commercial social service provision is most prominent. Against this background, the article comes to the conclusion that there is no simple answer to the question of path-dependency versus convergence. Indeed, in both countries commercial provision of social services is on the increase; however, current developments in Germany and the US do not reflect thoroughly the path-dependent or the convergence approach of depicting change. 相似文献