OBJECTIVES To present the prevalence of gun ownership among batterers and describe their self-reported use of guns to threaten intimate partners. METHODS We used multivariate methods to analyze data from 8529 men enrolled in Massachusetts certified batterer intervention programs between 1999 and 2003. RESULTS Seven percent of the sample reported owning guns during the past 3 years. Recent g...

Available online 7 April 2011 Purposes: To determine if perceived risk of criminal victimization, and past criminal victimization experiences, increases the likelihood of a person owning a gun for self-protection, and to determine if defects in past research concerning the way gun ownership was measured had obscured such effects. Methods: We analyzed data on over 2,500 U.S. adults, using differ...

As state transportation planners seek to build or support sustainable transportation systems in an era of economic challenges, they find few publicly available rail analysis models for stakeholders to examine the environmental impacts, socio-economic effects and costs associated in investing in rail infrastructure. This paper, taken from a University Transportation Center Program (UTCP Region 6...

This study examines the relationship between gun availability and crime in a cross-national sample of cities. Data from the International Crime Victimization Survey are used to examine three competing hypotheses. The results of the limited information maximum least squares regression analyses suggest that gun availability influences rates of assault, gun assault, robbery, and gun robbery. These...

This report evaluates criticism of rail transit systems. It examines claims that rail transit is ineffective at increasing public transit ridership and improving transportation system performance, that rail transit investments are not cost effective, and that transit is an outdated form of transportation. It finds that critics often misrepresent issues and use biased and inaccurate analysis. Th...

Presented is a 0.9 V rail-to-rail constant gm CMOS amplifier input stage consisting of complementary differential pairs and a gm control circuit. The gm control circuit eliminates the gm dead zone, which occurs in the conventional rail-to-rail amplifier with ultra-low supply voltages. The proposed amplifier input stage has a constant gm that varies by +2.3% for rail-to-rail input common-mode le...

Preventing broken-rail-caused derailments is a high priority for the rail industry and government. The current practice is to periodically inspect rails using non-destructive technologies such as ultrasonic rail inspection. Determining the optimal inspection frequency is a critical decision in railway infrastructure management. The objective of this paper is to develop an analytical framework t...

OBJECTIVE To determine whether pediatricians accurately estimate the likelihood of gun ownership among their patients' families. Design. Self-administered, written surveys completed simultaneously by pediatricians and their patients' parents. SETTING A total of 23 pediatric practices and hospital-based clinics in three cities in the United States. SUBJECTS A total of 66 pediatricians paired...

Rail surface defects such as the abrasion, scratch and peeling often cause damages to the train wheels and rail bearings. An efficient and accurate detection of rail defects is of vital importance for the safety of railway transportation. In the past few decades, automatic rail defect detection has been studied; however, most developed methods use optic-imaging techniques to collect the rail su...

The type and magnitude of loads passing through the track superstructure have a great impact on both the design and the performance of concrete sleepers and fastening systems. To date, the majority of North American research focusing on quantifying rail infrastructure loading conditions has been conducted on heavy-haul freight railroads. However, the results and recommendations from these studi...