Quantitative evaluation of latent fingermarks with novel enhancement and illumination

A variety of suspended silica and metal nanoparticles have been used over the last 20 years to enhance latent fingermarks. This study quantitatively evaluates enhancement of natural and sebum-enriched fingermarks from three adult subjects acquired with a consistent applied force on glass with a fingermark press using suspended commercially available polystyrene (PS) particles. Images of the enhanced fingermarks acquired with total internal reflection (TIR), or standard overhead white light (WL), illumination are compared with fingermarks enhanced with conventional methods including cyanoacrylate fuming. The different enhancement and illumination methods are quantified based on the brightness and contrast of the fingermark images, as well as the number of minutiae that can be identified and matched to those on an inked manually acquired “template” fingermark using automatic fingerprint identification system (AFIS) software. Enhanced fingermarks acquired with the press are shown to be more consistent than manually acquired fingermarks based on these metrics. The results demonstrate that TIR illumination from a large-area illuminator built in house gives enhanced fingermark images with more matched minutiae and contrast superior to that for WL illumination for all types of enhancement. “Wet-powdering” with PS particles gives fingermark images that are for the most part comparable in terms of the number of matched minutiae to fingermarks enhanced with more conventional methods, suggesting that this novel enhancement method has a performance comparable to conventional enhancement methods. Interestingly, the age of the fingermark appears to have almost no effect on this new type of enhancement; sebum-enriched fingermarks ranging in age from 12 h to 435 days appear to have statistically identical numbers of matched minutiae.     

农民集体土地所有权的独立性价值研究

目前我国集体土地所有权的行使存在着主体虚位、权能缺失、与国有土地所有权地位不平等的问题,不能有效保护农民在集体土地上的合法权益。在城乡二元管理体制下,集体土地承担着占我国人口70％的农民的社会保障、养老保障和医疗保障的功能,因此依法规范对集体土地的征收、征用,维护集体土地的独立性,具有重要价值。     

A Comparison of Methods for Analyzing Criminological Panel Data

We demonstrate that fixed- and random-effects models for pooled cross-sectional and time series data, and latent growth curve models for panel data are special cases of a more general model. We compare the estimates obtained from each type of model for a data set consisting of homicide rates and a vector of explanatory variables for 400 US counties over a 15-year period. Most, but not all, estimates are similar in the two models. We identify circumstances under which one approach may be advantageous to the other.

李业甫筋骨并举整脊法治疗颈性眩晕临床疗效观察

目的 观察李业甫筋骨并举整脊法治疗颈性眩晕的临床疗效.方法 将80例颈性眩晕患者按照随机数字表法分为对照组和观察组,每组40例.对照组患者采用常规推拿治疗,观察组患者采用常规推拿结合李业甫筋骨并举整脊法治疗.比较两组患者临床疗效,治疗前后颈性眩晕症状与功能评分、眩晕残障程度评定量表(dizziness handicap inventory,DHI)评分及椎-基底动脉血流速度.结果 两组患者临床疗效比较,差异有统计学意义(P<0.05),观察组的治疗效果优于对照组.两组治疗后颈性眩晕症状与功能评分均显著升高,DHI评分均显著降低(P<0.05),且观察组改善程度显著优于对照组(P<0.05).两组治疗后左侧椎动脉、右侧椎动脉、基底动脉平均血流速度均有所增加(P<0.05),且观察组改善程度优于对照组(P<0.05).结论 李业甫筋骨并举整脊法可以有效调节椎-基底动脉血流速度以减轻患者的眩晕症状.     

战略视角下的高级人才跨国和跨境流动

高级人才跨国和跨境流动呈现日趋频繁之势。文章从内部和外部驱动力入手,从心理契约和经济契约相结合的角度解释高级人才流动的原因,进而建立高级人才存量-流量模型,剖析高级人才流动的总量与结构,最后利用人才增值链理念,提出有效管理高级人才跨国和跨境流动的对策建议。     

短时交通流预测模型综述

交通流预测在智能交通系统中一直是一个热闹的研究领域，几十年来，专家和学者们用各种方法建立了许多相对而言精确的预测模型。本文在提出来交通流短期预测模型应具备的特性的基础上，讨论了几类主要模型的结果和精确度，并对交通流预测领域今后的发展趋势作出展望。     

从农民流动分化看发展农民工党员工作

改革开放以来,农村社会成员急剧分化并实现了多元性的流动,形成了“农民工阶层”。在农民工中发展党员对于巩固党的执政地位具有重要意义。当前,在发展农民工入党问题上存在一些不足之处,如：农民工入党问题尚未得到高度重视,农民工入党受入党意愿和条件双重限制等。因此,应在发展农民工入党工作中做到以下几点：坚持属地原则;架设党组织与农民工情感的桥梁和纽带;坚持标准,保证质量;健全具体制度。     

Notes on recent dissertations

The growing popularity and use of news Web sites around the world provides new possibilities for studying the position of the United States in the world system charted by digital news items. In this article, we look at 35 popular news sites in 10 different languages over a 2-year period, in order to assess the position of the United States in world news as well as to identify possible explanations for it. Our findings show that the United States is by far the most prominent country in the news sites that we studied from around the world, except for the French and Arabic ones. The network structure of news links clearly exhibits its key position as the centerpiece of a global system. Economic factors better explain America's news prominence than political, social, and geographical factors. Yet, none of the many variables we examined could explain the large gap between the news prominence of the United States and that of the rest of the world. We discuss possible reasons for these findings and suggest directions for further studies in the field.

[Supplementary material is available for this article. Go to the publisher's online edition of Political Communication for the following free supplemental resource: network data.]     

混合显现液对三种渗透性纸张上潜汗指印的显现

通过正交试验筛选出2%茚三酮与0.5%硝酸银/乙醇混合液分别对牛皮纸、硬纸板、A4复印纸三种客体表面上不同时期遗留的潜汗指印进行显现。结果表明该混合显现液均能显现渗透性和非渗透性客体上的新鲜指印,和不同时期的陈旧性潜汗指印。而且对陈旧性潜汗指印的显现效果与常见的显现方法的显现效果进行了对比,分析得出混合显现液在许多方面存在较多的优势。     

Applicability of Latent Dirichlet Allocation to multi-disk search

Digital forensics practitioners face a continual increase in the volume of data they must analyze, which exacerbates the problem of finding relevant information in a noisy domain. Current technologies make use of keyword based search to isolate relevant documents and minimize false positives with respect to investigative goals. Unfortunately, selecting appropriate keywords is a complex and challenging task. Latent Dirichlet Allocation (LDA) offers a possible way to relax keyword selection by returning topically similar documents. This research compares regular expression search techniques and LDA using the Real Data Corpus (RDC). The RDC, a set of over 2400 disks from real users, is first analyzed to craft effective tests. Three tests are executed with the results indicating that, while LDA search should not be used as a replacement to regular expression search, it does offer benefits. First, it is able to locate documents when few, if any, of the keywords exist within them. Second, it improves data browsing and deals with keyword ambiguity by segmenting the documents into topics.