Artistic enhancement in the production of photo-fit likenesses: An examination of its effectiveness in leading to suspect identification

Following a crime, witnesses are often asked by the police to construct a Photo-FIT likeness of the suspect. However, previous laboratory research has indicated that the quality of the likenesses produced can be very poor. This study investigated whether the artistic enhancement of the basic Photo-FIT by a skilled operator using a variety of techniques influenced the quality of the Photo-FIT impression produced, and in turn increased the likelihood of correct recognition from the Photo-FIT. Six professional police Photo-FIT operators produced one basic Photo-FIT which was not artistically enhanced in any way and one Photo-FIT which had been artistically enhanced. These two types of Photo-FIT were given to 105 police recruits who were required to identify which face that Photo-FIT represented from a photographic lineup of 12 ‘suspect’ photographs. Composites which had been enhanced were significantly more successful in leading to a correct identification than were basic composites which had not been enhanced. The implications of these findings for police procedure and practice in the employment of commercial composite systems are discussed.     

液相色谱-电喷雾离子阱质谱联用测定水中14种除草剂

目的建立水中14种除草剂液相色谱-电喷雾离子阱质谱联用分析方法。方法水样经固相萃取,洗脱液过膜后直接进行液相色谱-电喷雾离子阱质谱联用分析。结果水中14种除草剂定量分析线性关系良好,相关系数为0.995～0.998,检测限在0.005μg/mL～0.045μg/mL之间,在低、中、高3个不同浓度下,平均回收率在70.5%～110.2%之间,日内RSD均小于10.2%,日间RSD均小于14.4%。结论该方法具有快速、灵敏、高效等优点,能够满足相关司法鉴定工作的要求。     

宪法的生命与权威———以规范与现实的逻辑关系为视角

影响宪法权威的因素有宪法规范上的原因、司法援引上的原因以及对宪法规范的实施所秉持的态度等,其中宪法规范的稳定性对于宪法权威的影响需要我们掌握正确的宪法稳定的认定标准,这对于维护宪法权威是至关重要的。另外,宪法的权威真正体现在社会生活之中,如何使宪法成为一个活的宪法,使宪法进入司法领域成为裁判的依据,发挥宪法作为法所具有的惩戒性、强制性的功能需要我们既要对现有的制度进行适当的完善,又要切实地落实现有的宪法规范所具有的制度意义。     

政治稳定:社会转型中服务型政府建设的目标导向

随着改革开放的不断深入和社会主义市场经济体制的建立,中国社会正在经历极其深刻转型的同时,影响政治稳定的不确定性因素也在日益增多。服务型政府建设不仅要有利于推进政治体制改革,而且要有利于维护政治稳定。所以,建设服务型政府就必须以保障政权的稳定性、加强政府的责任性、维护政治生活的秩序性、增强政治制度的内聚性为向度。     

Assessing Stability and Change in Criminal Offending: A Comparison of Random Effects, Semiparametric, and Fixed Effects Modeling Strategies

An important theoretical problem for criminologists is an explanation forthe robust positive correlation between prior and future criminaloffending. Nagin and Paternoster (1991) have suggested that the correlationcould be due to time-stable population differences in the underlyingproneness to commit crimes (population heterogeneity) and/or thecriminogenic effect that crime has on social bonds, conventionalattachments, and the like (state dependence). Because of data andmeasurement limitations, the disentangling of population heterogeneityand state dependence requires that researchers control for unmeasuredpersistent heterogeneity. Frequently, random effects probit models havebeen employed, which, while user-friendly, make a strong parametricassumption that the unobserved heterogeneity in the population follows anormal distribution. Although semiparametric alternatives to the randomeffects probit model have recently appeared in the literature to avoid thisproblem, in this paper we return to reconsider the fully parametric model. Viasimulation evidence, we first show that the random effects probit modelproduces biased estimates as the departure of heterogeneity from normalitybecomes more substantial. Using the 1958 Philadelphia cohort data, we thencompare the results from a random effects probit model with a semiparametricprobit model and a fixed effects logit model that makes no assumptions aboutthe distribution of unobserved heterogeneity. We found that with this dataset all three models converged on the same substantive result—evenafter controlling for unobserved persistent heterogeneity, with models thattreat the unobserved heterogeneity very differently, prior conduct had apronounced effect on subsequent offending. These results are inconsistentwith a model that attributes all of the positive correlation between priorand future offending to differences in criminal propensity. Sinceresearchers will often be completely blind with respect to the tenabilityof the normality assumption, we conclude that different estimationstrategies should be brought to bear on the data.     

中东欧国家与冷战后北约的新变化

冷战结束后,北约并未因对手的消失而瓦解,而是通过扩大组织、出台新战略和实施新行动找到生存依据并获得新的发展。在北约的新扩大、新战略和新行动中,中东欧国家不管是主动参与还是被动接受,都起到了不可低估的作用。中东欧国家的加入令北约成员国从16个增至30个,拓展了北约的疆域。东欧剧变带来的国际局势的变化,特别是前南斯拉夫地区发生的战争促使北约提出新的战略概念,波黑战争、科索沃战争和马其顿危机更是成为北约新战略的试验场。中东欧国家参与了北约在波黑、科索沃、阿富汗和伊拉克的行动以及乌克兰危机发生后针对俄罗斯的军事部署,做出独有的贡献。同时,中东欧国家的加入也给北约在决策效率、行动能力、责任分担和价值观方面带来新的挑战。不过,由于中东欧国家的军事力量和国家实力有限,在北约内部的影响力不大,这些挑战不足以危及北约的生存。     

血液样品中乙醇稳定性的实验研究

目的考察在不同存放条件下含乙醇的血液样品中乙醇浓度的变化情况。方法采用顶空-气相色谱法,以异丙醇为内标,对存放条件不同的血液样品中乙醇进行检测。结果冷冻(-10℃)条件存放1至30天,血液样品中乙醇含量无显著变化;冷藏(4℃)条件存放1至30天,血液样品中乙醇含量变化不显著;室温(28℃~33℃)条件存放1至30天,血液样品中乙醇含量显著改变。结论含有乙醇的血液样品,在冷冻、冷藏条件下可较稳定的存放30天;在室温条件下存放30天血液样品中乙醇浓度发生显著变化,不可在此条件下存放。     

Managing commercial risks in open source software licensing

Legal context: The article reviews the commercial risk allocation clauses intypical open source licence terms and discusses their enforceabilityand implications. Key points: The enforceability of warranty disclaimers and limitation ofliability clauses in common open source licence terms is questionable,particularly in a cross-border context, and commercial licensorsshould take additional steps to protect themselves from down-streamrisks. Practical significance: Open source software presents a number of unusual commercialissues, because it is available free of charge and the providerstry to disclaim warranties and liabilities. End users and resellershave to adjust their own in- and out-licensing models to accommodatethis situation.     

死后血浆和溶血样本中IgE的稳定性

目的 探究死后血浆和溶血样本中免疫球蛋白E(immunoglobulin E,IgE)经过不同保存条件及冻融处理后的稳定性.方法 选取39例死后48 h内非冷冻尸体的心血样本,其中20例取血浆样本,19例取全血制成溶血样本.将样本置于-20℃、4℃、25℃条件下保存28 d及-80℃条件下保存1年以探究IgE在不同保存...     

自制海洛因标准品在常用有机溶剂中稳定性研究

目的 研发海洛因标准品及优化分析方法,以对云南缴获海洛因样本提纯制备成的自制海洛因对照品在常用有机溶剂中的稳定性进一步研究.方法 采用内标及GC、GC/MS方法,通过对提纯制备的海洛因在5种有机溶剂中冷藏保存后含量的变化,观察海洛因在常用有机溶剂中的稳定性.结果 乙醇、三氯甲烷及乙腈为溶剂的自制海洛因对照品储备液,保存30天时间范围内海洛因含量未发生明显变化;以丙酮作为溶剂的自制海洛因对照品储备液,在7至30天时间范围内,海洛因含量明显升高;以甲醇作为溶剂的自制海洛因对照品储备液,在0小时至30天时间范围内,海洛因含量一直呈明显的下降趋势.结论 乙醇、三氯甲烷及乙腈可以作为海洛因样品储备液溶剂使用,丙酮、甲醇不适合作为海洛因样品储备液溶剂使用.