A preliminary investigation into the use of testate amoebae for the discrimination of forensic soil samples

We present the results of an initial investigation into the efficacy of using testate amoebae for the discrimination of soils from wet ground and puddles, as little attention has been given to these organisms in forensic science. The preservation of testate amoebae in these sediments is generally good, although test concentrations are low. Statistical analysis suggests that testate amoebae assemblages are somewhat spatially distinct and have potential to be used for soil discrimination. A case study is presented where mineralogical (X-ray diffraction) and testate amoebae analyses are used in conjunction to clarify the scene of crime in a ‘cold case’ murder enquiry. Testate amoebae were recovered from dried sediment residues on clothing 10 years after the murder. Despite these promising results, further experimental work is crucial to examine the spatial and temporal variation of amoebae assemblages in water films, wet ground and puddles before they can be added to the armoury of methods available to the forensic biologist.     

从反核威慑战略到最低核威慑战略:中国核战略演进之路

当前学者们对中国核战略的争论焦点在于,没有任何一种现有核战略定义能够完全涵盖中国核政策的特点。本文认为,正确理解中国核战略,需要摆脱现有核战略理论概念体系的束缚。只有从中国核战略产生和发展的具体时代背景中寻找线索,才能认识到,中国核战略经历了从反核威慑战略到最低核威慑战略的巨大转变,而中国长期大规模备战核战争遗留下来的物质遗产和思想基础,仍然对中国核战略产生着巨大的影响力。中国学者应从中国核战略实践出发,参与构建主流话语体系,为核战略学科建设做出自己的贡献。     

全球减排路线图的正义性——对胡鞍钢教授的全球减排路线图的评价与修正

任何全球减排路线图的绘制都无法脱离国际正义而具有生命力。气候变化问题的特性要求全球减排路线图尊重具有两面性的国际气候正义:环境正义和发展正义,需要考虑国家间公平、人的公平和代际公平。仅以人类发展指数(HDI)作为衡量国家承担减排责任的标准缺乏足够的正义,至少还需要加入人均历史累积排放和气候变化脆弱性两个指标。三者分别体现气候变化正义性中的人的平等发展权、减排责任分担和对受害者在排放权上的补偿。综合三大指标后的四分组分类,才是更体现正义性、更容易被接受和执行的路线图。从正义性出发,中国应承担相应的减排责任,并努力推动全球减排进程,但也要注意维护自身的发展权益。中国在全球减排中的作为,应是在国际正义与国家发展战略间取得平衡。     

Cultural and Spiritual Constructions of Mental Distress and Associated Coping Mechanisms of Tibetans in Exile: Implications for Western Interventions

The Tibet-TPO project in Dharamsala, North India aims to provideculturally sensitive psychosocial support to Tibetan refugees.In this study we have examined the cultural and spiritual constructionsof mental distress of Tibetan exiles from a secondary analysisof previously published data. Tibetans refugees' constructionsof mental distress were intimately linked to cultural, religiousand political factors. Family and religious support were regardedas key coping strategies, yet many new refugees lacked bothfamily support and detailed knowledge and understanding of TibetanBuddhism. Not all of those interviewed were positive about ‘westernapproaches’ to dealing with mental distress, but thoseusing the service seemed to do so in a pragmatic and integrativeway. We conclude that culturally sensitive psychosocial supportcan usefully ‘fill a gap’, especially for new refugeeswho lack both family support and access to, or understandingof, traditional religious coping mechanisms.     

False-negative probability in the SEM/EDS automated discovery of iGSR particles: A Bayesian approach

The automated search software integrated with a scanning electron microscope (SEM/EDS) has been the standard tool for detecting inorganic gunshot residues (iGSR) for several decades. The detection of these particles depends on various factors such as collection, preservation, contamination with organic matter, and the method for sample analysis. This article focuses on the influence of equipment resolution setup on the backscattered electron images of the sample. The pixel size of these images plays a crucial role in determining the detectability of iGSR particles, especially those with sizes close to the pixel size. In this study, we calculated the probability of missing all characteristic iGSR particles in a sample using an SEM/EDS automated search and how it depends on the image pixel resolution setup. We developed and validated an iGSR particle detection model that links particle size with equipment registers and applied it to 320 samples analyzed by a forensic science laboratory. Our results show that the probability of missing all characteristic iGSR particles due to their size is below 5% for pixel sizes below 0.32 μm². These findings indicate that pixel sizes as large as twice the one commonly used in laboratory casework, that is, 0.16 μm², are effective for initial sample scanning, yielding good detection rates of characteristic particles that could exponentially reduce laboratory workload.     

The applications of MicroCT in studying age-related tooth morphological change and dental age estimation: A scoping review

Conventional dental age estimation relies on destructive methods such as sectioning and staining, which are unpreferable when the tooth is required for evidential or archeological preservation. MicroCT is a non-destructive, high-resolution imaging technique that allows for accurate morphometrical measurement. Although microCT technology has been applied in a variety of dental studies, studies focusing on dental age-related change and dental age estimation based on microCT imaging remain lacking. Based on the question: “How has microCT technology been applied in studying human age-related tooth morphological change and dental age estimation studies?”, the authors conducted a scoping review in accordance with the Arksey and O'Malley (2005) and the PRISMA-ScR guidelines. A literature search using five major scientific databases identified 452 articles, with 11 full-text articles being eligible to be included in the scoping review. Furthermore, 6 out of the 11 studies performed dental age estimation modeling. An overview of the parameters used in the selected articles revealed a variety of tooth characteristics, such as pulp cavity to whole tooth volume ratio, secondary dentin, as well as the diameter of root canal orifice. The findings of this scoping review highlight the extent microCT is used in studying dental age-related changes, as well as the effectiveness of microCT in dental age estimation studies. This review serves as a guide for future forensic odontology age estimation studies.     

Uncertainty in probabilistic genotyping of low template DNA: A case study comparing STRMix™ and TrueAllele™

Two probabilistic genotyping (PG) programs, STRMix™ and TrueAllele™, were used to assess the strength of the same item of DNA evidence in a federal criminal case, with strikingly different results. For STRMix, the reported likelihood ratio in favor of the non-contributor hypothesis was 24; for TrueAllele it ranged from 1.2 million to 16.7 million, depending on the reference population. This case report seeks to explain why the two programs produced different results and to consider what the difference tells us about the reliability and trustworthiness of these programs. It uses a locus-by-locus breakdown to trace the differing results to subtle differences in modeling parameters and methods, analytic thresholds, and mixture ratios, as well as TrueAllele's use of an ad hoc procedure for assigning LRs at some loci. These findings illustrate the extent to which PG analysis rests on a lattice of contestable assumptions, highlighting the importance of rigorous validation of PG programs using known-source test samples that closely replicate the characteristics of evidentiary samples. The article also points out misleading aspects of the way STRMix and TrueAllele results are routinely presented in reports and testimony and calls for clarification of forensic reporting standards to address those problems.     

遵约与国际制度的有效性:情投意合还是一厢情愿

20世纪90年代,国际关系学与国际法学开始走上了相互借鉴、学习的道路。国际关系学者和法学研究者在遵约研究方面具有共同的议程,遵约研究已经成为国际关系理论的重要方面。遵约被国际关系学界用来衡量制度的因果影响,具有一定的客观性。但是,遵约与国际制度有效性之间并不具有必然的联系,遵约是对制度因果关系的误读。此外,认识论、方法论上及分析层次、内生性问题上也对遵约研究提出了挑战。遵约研究对制度有效性的启示在于:应该慎重选择衡量结果的指标,从而准确评估制度对国家政策和行为的因果影响。