A Systematic Study to Understand the Effects of Particle Size Distribution of Magnetic Fingerprint Powders on Surfaces with Various Porosities

This study intends to design magnetite (Fe₃O₄)‐based magnetic fingerprint powders with different particle size distributions. It also investigates the influence of particle size distribution on the visualization of latent fingermarks with as little background staining as possible on the surfaces with various porosities in a systematic way. Two strategies were used to prepare the magnetic fingerprint formulations for this study: milling of coarse magnetite particles for different durations, and mixing of sieved fine particles with different size ranges with coarse particles. Particle size analyses of the prepared magnetic powders, optical microscopy‐based roughness analysis of the surfaces and SEM measurements of the visualized fingerprints and representative powders were performed. Mag2 of the formulations prepared through milling and Mag5 and Mag6 of the formulations prepared through sieving and mixing were more successful in the development of latent prints than the rest of the solutions.     

我国农村人口问题的现状与出路

我国是一个农业大国,农村人口基数大、素质低、性别失衡、负担重等现状不仅影响农村进一步发展,而且制约我国城市化水平的提升。只有找到农村人口问题的成因,才能提出解决办法,从而建立起科学的长效机制。     

试析布莱尔政府的劳资观及其实践

合理协调劳资之间的利益矛盾,对任何政府来说都是至关重要的。布莱尔领导的工党连续三次赢得大选,这样的成绩是与其劳资关系协调政策密不可分的。布莱尔政府的劳资观以老工党的政策为基础,对劳资两阶级采用“双赢方针”,既要争取资方的支持,又要尽力保持原有的社会基础。在这一劳资观指导下对劳资关系进行协调的途径主要包括价值观念协调、经济政策协调、社会政策协调和法律协调。     

黑龙江省对俄罗斯科技合作发展战略研究

俄罗斯是世界上的科技大国，在世界级102项顶尖技术中，俄罗斯掌握57项，有27项具有世界一流水平。我省应充分利用毗邻俄罗斯的地缘、历史渊源和人才优势，全面实施对俄科技合作发展战略，促进全省科技和经济跨越式发展。     

以科学发展观指导中国竞争法政策目标的选择

我国竞争法政策目标的选择,应以科学发展观为指导,充分体现统筹兼顾、协调发展的理念,紧密结合中国现阶段经济社会发展的特点,努力实现竞争法政策目标的内部协调、竞争法政策目标与产业政策目标的协调以及竞争法政策目标与社会政策目标的协调。     

Why some countries are immune from the resource curse: The role of economic norms

The political resource curse – the detrimental effect of natural resource dependence on democracy – is a well-established correlate of authoritarianism. A long-standing puzzle, however, is why some countries seem to be immune from it. We address this issue systematically by distinguishing two kinds of economies: contract-intensive, where individuals normally obtain their incomes in the marketplace; and clientelist, where individuals normally obtain their incomes in groups that compete over state rents. We theorize that the institutionalized patronage opportunities in clientelist economies are an important precondition for the resource curse, and that nations with contract-intensive economies are immune from it. Analysis of 150 countries from 1973 to 2000 yields robust support for this view. By introducing clientelist economy as a prerequisite for the resource curse, this study offers an important advance in understanding how nations democratize.     

Effects of Ketamine on the Development of forensically important Blowfly Chrysomya megacephala (F.) (Diptera: Calliphoridae) and its Forensic Relevance

This study investigated effects of ketamine on the development of Chrysomya Megacephala (Diptera: Calliphoridae) at three different temperatures. Larvae of the C. Megacephala were exposed to different concentrations of drugs and temperatures. The larval lengths, weights, and developmental durations of each stage were observed. This study demonstrated that ketamine, low temperature, and their synergistic action significantly suppressed the development of C. Megacephala (p < 0.001). The time that the larvae in all the treatments achieved the maximum length/weight was significantly delayed (p < 0.05), and that resulted in prolonged duration of larval and prepupal stages especially at low temperature. However, no linear correlations were discovered between ketamine concentration and growth rate of larval length/weight.     

Incremental validity of ambulatory assessment of acute dynamic risk in predicting time to recidivism among prisoners on parole

ABSTRACT

This study investigates the incremental validity of changes in ten stress-related acute dynamic risk factors, collected through automated telephony over 30 consecutive days following parole, for predicting time to recidivism during the following year. Before release, the participants completed self-report assessment of some stable risk factors – impulsiveness and history of problematic substance use – as well as an assessment of symptoms of anxiety experienced during the weeks prior to release. Analysis of the baseline assessments showed that impulsiveness and a history of problematic substance use, but not pre-release symptoms of anxiety, were associated with recidivism during the parole year. Growth modelling using a linear mixed model was used to assess whether inmates on parole showed changes in acute dynamic risk factors during the first month following release. Individual growth model slopes and intercept were then extracted and used as covariates in a series of Cox regression analyses to test whether changes in acute dynamic risk factors could provide incremental predictive validity beyond baseline stable risk factors. Changes in five dynamic risk factors were associated with an increased risk of recidivism, of which daily drug use and daily summary score showed incremental predictive improvement beyond impulsiveness and history of problematic drug use.