Determination of impact sensitivity of materials at high pressures

Compact device is used to determine impact sensitivity of material in static, high pressure, gaseous environment. It can also be instrumented to monitor and record pressure, temperature, and striker impact force. Device is used in conjunction with commercially available liquid oxygen impact tester which provides impact energy

Infrasonic observations of large-scale HE events

The Los Alamos Infrasound Program has been operating since about mid-1982, making routine measurements of low frequency atmospheric acoustic propagation. Generally, the authors work between 0.1 Hz to 10 Hz; however, much of the work is concerned with the narrower range of 0.5 to 5.0 Hz. Two permanent stations, St. George, UT, and Los Alamos, NM, have been operational since 1983, collecting data 24 hours a day. For the purposes of this discussion, the authors concentrate on their measurements of large, high explosive (HE) events at ranges of 250 km to 5330 km. Because their equipment is well suited for mobile deployments, they can easily establish temporary observing sites for special events. The measurements are from the permanent sites, as well as from various temporary sites. A few observations that are typical of the full data set are given

Technology based supply chain training: its use and effectiveness

Employee training is a huge business in the United States with spending in the neighborhood of $51 billion dollars. Over the last five years a growing proportion of training dollars have been committed to technology based training involving distance learning and e-learning. This article reports on the use of these innovative training methods in supply chain management and their impact on organizations in terms of cost effectiveness, time efficiency, skill development, and return on investment

Vortex Structures Formed by the Interference of Sliced Condensates

We study the formation of vortices, vortex necklaces and vortex ring structures as a result of the interference of higher-dimensional Bose-Einstein condensates (BECs). This study is motivated by earlier theoretical results pertaining to the formation of dark solitons by interfering quasi one-dimensional BECs, as well as recent experiments demonstrating the formation of vortices by interfering higher-dimensional BECs. Here, we demonstrate the genericity of the relevant scenario, but also highlight a number of additional possibilities emerging in higher-dimensional settings. A relevant example is, e.g., the formation of a "cage" of vortex rings surrounding the three-dimensional bulk of the condensed atoms. The effects of the relative phases of the different BEC fragments and the role of damping due to coupling with the thermal cloud are also discussed. Our predictions should be immediately tractable in currently existing experimental BEC setups.Comment: 8 pages, 6 figures (low res). To appear in Phys. Rev. A. Full resolution preprint available at: http://www-rohan.sdsu.edu/~rcarrete/publications

Automated synthesis of sequence invariant state machines

A computer aided design (CAD) tool for the design of very large scale integration (VLSI) synchronous sequential controllers is presented. Both the design and layout of the state machine are automatically generated. The program is process independent allowing a choice of design rules to base generation upon. An incremental layout creation approach was implemented which makes the tool useful in a wide range of layout applications. Flow table descriptions are input to characterize the desired machine and a layout archive is output

Managing crime and the fear of crime at railway stations––a case study in South Wales (UK)

Rail users consistently perceive their risks from crime to be significantly higher than official statistics suggest, discouraging many from using rail transport. The aims of the paper include a discussion of Crime Prevention Through Environmental Design (CPTED) and current policy initiatives for reducing crime and the fear of crime on the railways. This exploratory study focuses on adult passengers' perceptions of crime and nuisance as they relate to the management, design and maintenance of railway stations and their immediate access routes. The study innovatively utilises interactive virtual reality (VR) scenes of ‘representative' stations as the environmental stimulus and concludes that such an approach provides an analytical and pragmatic framework for managers of railway stations that are unlikely to receive Secure Station accreditation

Tackling Crime and Fear of Crime Whilst Waiting at Britain's Railway Stations

Crime on the railways in Britain is an increasing concern for train operating companies,the British Transport Police (BTP), passengers, and local residents. Significantly,rail users consistently perceive their risks from crime to be considerably higher thanofficial crime statistics indicate, having a negative affect on levels of patronage. Thisarticle presents an exploratory study of passengers’ fear of crime while waiting atrailway stations using Quick Time Virtual Reality (QTVR) walkthrough scenes. QTVRarguably represents an innovative, dynamic, and interactive environmental stimulusfor gaining insights into passengers’ fear of crime. Visibility at stations was identifiedas a crucial factor in determining levels of fear of crime. The design of the stationshelter is analyzed as an example of how crime prevention through environmentaldesign (CPTED) is being implemented on railway stations by Valley Lines (Wales and Borders Trains) on its network in South Wales (UK)

Instructional Uses of Instant Messaging (IM) During Classroom Lectures

Can “Information Age” learners effectively multi-task in the classroom? Can synchronous classroom activities be designed around conceptually related tasks, to encourage deeper processing and greater learning of classroom content? This research was undertaken to begin to address these questions. In this study, we explored the use of instructionally-related instant messaging (IM) discussions during undergraduate university lectures. Over the course of three weeks, students practiced with and then employed hand-held computers for brief, synchronous class discussions in response to assigned questions related to the lectures. Students were observed during these sessions, and students and the instructors were interviewed separately afterwards. The contents of students’ discussions indicate that they were capable of engaging in on-task discussions and of expressing opinions and exploring instructionally relevant topics. However, even though students routinely multi-task in classrooms as they attend to lectures, process the contents, and record notes for later study, both students and the instructors expressed some discomfort with discussion occurring synchronously with classroom lectures. In this paper, we describe student discussion behavior, and reflect on possible applications of multiple sequential (rather than simultaneous) tasks during classroom instruction