Nondestructive Differentiation of Polyester Single White Fibers Using Synchrotron Radiation Microbeam X-ray Fluorescence Spectrometry with Vertical Focusing

In this study, the nondestructive differentiation of individual white polyester clothing fibers was accomplished via synchrotron radiation microbeam X-ray fluorescence (SR-μ-XRF) analysis. SR-μ-XRF with vertical focusing is a useful nondestructive method for the analysis of a single polyester clothing fiber. Kirkpatrick–Baez (KB) mirror was used to vertically focus 20 keV X-rays for the analysis of 22 individual white polyester fibers taken from clothing commonly sold in Japan. SR-μ-XRF with a vertical focused 2 μm (V) × 300 μm (H) beam was approximately 12.8 times more sensitive than SR-XRF with an unfocused 300 μm (V) × 300 μm (H) beam for the detection of elements in single fibers. The minimum detection limits (MDLs) of the SR-μ-XRF method were 8.15 ppm for Cl and 0.06 ppm for Br. In addition to Ti in TiO₂ delustering agents, Zr and Nb impurities in the delustering agents were detected in individual fibers. Sb from a polymerization catalyst and Co from a transesterification catalyst were also detected in individual fibers. Comparing the Ti K_β/Sb L_α,β and Zr K_α/Nb K_α X-ray intensity ratios was a useful way to distinguish individual clothing fibers, and 98% of the fibers were differentiated when additional trace elements were used as discrimination indicators.     

New Approaches to Age Estimation Using Palatal Suture Fusion

Palatal suture fusion has seen little testing and/or application due in part to an inadequately described relationship to formal age ranges. This study presents a modified scoring method that examines fusion on samples of modern documented adult males and compares two Bayesian approaches to age estimation. In the first analysis, American and Portuguese collections were used to derive univariate and multivariate transition analysis (TA) parameters, which combined with an informative prior, estimated age in a sample of modern Americans and Portuguese. For the second analysis, a Bayesian multiple linear regression (BMLR) used indicator statuses as the independent variables with age as the dependent variable. Highest posterior density regions (HPDRs) and highest posterior density intervals (HDI) were calculated for a holdout sample. Final age estimates for the methods were tested for accuracy using cumulative binomial tests at 75% and 90% coverages. The HPDRs from multivariate TA captured age better for younger individuals, but consistently underaged. The cumulative binomial tests on the BMLR results indicated the prediction intervals performed as expected, and we show they are narrower (more precise) and/or more accurate than the corresponding HPDR. The modified method presented here formally links palatal suture obliteration to age using two different approaches, one of which (BMLR) is new to the aging literature. The BMLR provided results free from bias and more reasonable age ranges while maintaining accuracy. We present a look-up table and a free, simple R file for users to download and run their own estimates with BMLR.     

Examination of Hacking and Blunt Force Skeletal Trauma

Hacking trauma is prevalent in forensic cases involving genocide and dismemberment, but research into the identification of this type of trauma is lacking. The present study examines characteristics of hacking and blunt force skeletal trauma in order to determine if there is a point at which blunt force trauma becomes distinguishable from hacking trauma. Ten implements with a range of blade angles (i.e., the striking surface of the implement) were used in conjunction with a controlled-force hacking device to impact 100 limb bones of white-tailed deer (Odocoileus virginianus). Observations of the trauma included the occurrence and degree of fragmentation, the entrance widths of the impacts, and composite scores of six hacking characteristics, especially the distinctive V-shaped kerf. ANOVA tests and regression analyses were used to assess the relationships between these characteristics and the blade angles. A significant relationship (p-value = 0.011) was found between the composite hacking scores and the blade angles, indicating that blunt force and hacking trauma can be distinguished. The entrance widths of the impacts exhibited a significant relationship with the blade angles (p-value = 0.037). There was also a significant relationship between the visibility of a V-shaped kerf in the bones (p-value = 0.003), with visibility decreasing around the 60° blade angle. These data should assist in establishing guidelines to differentiate hacking and blunt force skeletal trauma in cases where the implement is on a spectrum between sharp and blunt.     

A Qualitative Analysis of Vietnamese Adolescent Identity Exploration Within and Outside an Ethnic Enclave

Focusing on identity development explorations enables a greater understanding of contexts that affect immigrant adolescents. Utilizing thematic and grounded narrative analysis of 46 journal writings, during a one-month period, from first and second generation Vietnamese adolescents ranging in age from 15 to 18 (26 residents of a culturally and politically active ethnic enclave in Southern California; 20 adolescents living outside the enclave), this study establishes ways in which a focus on social context and exploration processes illuminates the complexity of immigrant adolescents’ identity formation. The two groups shared many similarities, including precipitants to exploration and steps undertaken to explore identity. However, two factors—social and cultural influences and emotional reactions—revealed interesting contrasts distinguishing enclave from non-enclave dwelling Vietnamese adolescents. Data also suggested that immigrant adolescents strive to integrate different domains of identity (ethnicity, gender, career) both with one another and with the historical, social, and cultural contexts they occupy.

Examining Temporal Associations Between School Connectedness and Early Adolescent Adjustment

This study examined (a) the associations between school connectedness and early adolescent adjustment problems over a 1 year period and (b) the equivalence of these associations across gender. Five hundred middle school students (53.4% female), initially in the 6th and 7th grades, participated in the two-wave study. Results from two-group cross-lagged panel analyses were consistent across boys’ and girls’ data. After controlling for baseline levels of adjustment problems, school connectedness predicted lower levels of early adolescent conduct problems 1 year later. Regarding the opposite direction of associations, and even after baseline levels of school connectedness were taken into account, conduct problems predicted lower levels of subsequent school connectedness. There were no cross-lagged associations between depressive symptoms and school connectedness, although elevated levels of baseline depressive symptoms predicted higher levels of subsequent conduct problems. Findings elaborate previous research by demonstrating that early adolescents actively shape the middle school environment.

《毒品识别与检验》实验教学体系创新性探索

目前公安教育普遍面临着实验教学体系薄弱的现状,在教学中为培养具有综合能力和创新能力的禁毒警察,改变现阶段禁毒民警业务知识薄弱的现状,我院禁毒学专业对“毒品识别与检验”实验教学体系进行改革,进行创新性教育的探索。     

刑法第306条的理性解读

刑法第306条是对刑事辩护权的限制和对律师职业的歧视,它被形象地称为悬在辩护律师头上的一把达摩克利斯之剑.对比刑法其他相关条文,不难发现刑事辩护在我国遭受立法歧视的现实.刑事辩护没有空间,究其原因一是因为在中国立法活动被异化为纯粹的权力、利益的较量.二是中国缺乏公正对待刑事辩护的土壤:制度上中国不具备弹劾式诉讼构造和正当程序模式;理念上中国没有真正贯彻无罪推定的原则和人权保障的价值观念;更深层次的原因是中国缺乏法治文化.     

Transatlantic cooperation on terrorism and Islamist radicalisation in Africa: the Franco-American axis

Transatlantic cooperation on security has a long history. In Africa, transatlantic cooperation on security is basically between France and the United States. This paper asks why the two former competitors in Africa started to cooperate and also why they are so willing to engage militarily. The central argument in this paper poses that France and the US cooperate because it is indispensable to both parties. To France, the cooperation is indispensable because the US is the only power with sufficient financial means and with sufficient air-lift capacity to transport French and African troops into conflict-ridden countries. To Washington, cooperation with Paris is indispensable because the French authorities have unique access to intelligence and knowledge about large parts of Africa. By applying a foreign policy analysis framework, the paper analyses how perceptions of decision-makers, the role of personality and leadership, the role of government institutions and political systems have impacted the relevant decisions. It is emphasised that the two different decision-making systems – the French “state dominated” and the American “society dominated” – produce the same result, namely collaboration. It suggests that the perception of a serious threat from terrorism and Islamist radicalisation overrules differences in decision-making systems.     

The Investment Approach to Public Service Provision

The investment approach to public service provision is now receiving considerable attention worldwide. By promoting data‐intensive assessments of baseline conditions and how government action can improve on them, the approach holds the potential to transform policy development, service implementation, and program evaluation. Recently, variations on the investment approach have been applied in Australia to explore the effectiveness of specific programs in employment training, criminal justice, and infrastructure development. This article reviews the investment approach, presents a Public Investment Checklist to guide such work, and discusses three examples. It concludes by considering the implications of investment thinking for the work of policy designers and public managers.     

Risk,politics, and development: Lessons from the UK's democracy aid

Political risks are inescapable in development. Donors keep them in check with a range of tools, but existing options provide little guidance about how political forms of risk can—or should—shape programme design. This paper presents a novel framework that offers practical guidance on how to think about and manage some of these risks. This is based on a review of programmes delivered by the Westminster Foundation for Democracy, which provides a specific type of aid: democracy assistance. Political forms of risk have a strong influence on that aid, so it provides a valuable example. Our framework centres on two trade‐offs inherent in the provision of aid for democracy support. The first relates to the type of approach employed in a programme; should it focus on a thematic issue or a specific event, or should it focus primarily on an institution and its processes? The second concerns the scope of a programme in terms of who it includes. Understanding the costs and benefits of these trade‐offs will help development practitioners to make decisions about political risks in a more rigorous and transparent way and, potentially, to shift from a culture of risk aversion, to one of informed risk‐taking.