An investigation of the plastic fracture of high strength steels

Three generally recognized stages of plastic fracture in high strength steels are considered in detail. These stages consist of void initiation, void growth, and void coalescence. A brief review of the existing literature on plastic fracture is included along with an outline of the experimental approach used in the investigation

The Physician\u27s Workstation Health Care Revolution or the Nearest Mis Yet?

The practice of medicine is an information rich activity, yet information systems have had melancholy history as aids to decision making physicians. Some of the reasons for this lack of acceptance are examined along with the potential that emerging technology may have for the acceptance of a future physician’s workstation. The use of information technology in the practice of medicine seems inevitable, but social impediments to its use may delay its widespread introduction for a decade or more. In the meantime experiments which document the existence or absence of the anticipated benefits should be designed and carried out

Computer Technology: State of the Art and Future Trends

Computer technology, and more broadly information technology, is invigorating a fundamental transformation in our society form an industrial economy to an information economy. A review of the short history and present state of information technology identifies two major undercurrents: the miniaturization of computer components which has produced a million-fold increase in the complexity possible in a single chip of silicon and the integration of four previously separate areas of information technology: computation, communication, databases and the user interface. Microelectronics, computer networks, data storage and user amenities are the basic technologies that support these four areas and stimulate their progress. Future trends in speech recognition, voice synthesis, artificial intelligence, expert systems, computational imaging and scientific workstations are also examined

Computer Technology: State of the Art and Future Trends

Computer technology, and more broadly information technology, is invigorating a fundamental transformation in our society form an industrial economy to an information economy. A review of the short history and present state of information technology identifies two major undercurrents: the miniaturization of computer components which has produced a million-fold increase in the complexity possible in a single chip of silicon and the integration of four previously separate areas of information technology: computation, communication, databases and the user interface. Microelectronics, computer networks, data storage and user amenities are the basic technologies that support these four areas and stimulate their progress. Future trends in speech recognition, voice synthesis, artificial intelligence, expert systems, computational imaging and scientific workstations are also examined

Project Zeus: Design of a Broadband Network and its Application on a University Campus

This proposal outlines a plan for the design, deployment, and operation of the high speed campus network at Washington University based on fast packet switching technology that has been developed here during the last several years. This new network will support ubiquitous multimedia workstations with high-resolution graphics and video capabilities, opening a wide range of new applications in research and education. It will support aggregate throughputs of hundreds of gigabits per second and will be designed to support port interfaces at up to 2.4 Gb/s. Initial implementations will emphasize 155 Mb/s port rates, with higher rates introduced as the demand arises and as economic permits. WE propose to move this technology quickly into an operational setting where the objectives of network use and network research can be pursued concurrently

Backpack VLBI terminal with subscentimeter capability

Backpack portable equipment was developed to measure vector baseline from approximately 1 km to 100 km in length with subcentimeter to few centimeter accuracy. The equipment design features as well as the instrumentation specifications are discussed. It is shown that the unit has the following advantages: it is simple in concept; it is reliable in unattended operation; and it is inexpensive (less than $15,000 per unit)

Experimental Evaluation of Psychophysical Distortion Metrics for JPEG-Encoded Images

Two experiments for evaluating psychophysical distortion metrics for JPEG-encoded images are described. The first is a threshold experiment, in which subjects determined the bit rate or level of distortion at which distortion was just noticeable. The second is a suprathreshold experiment in which subjects ranked image blocks according to perceived distortion. The results of these experiments were used to determine the predictive value of a number of computer image distortion metrics. It was found that mean-square-error is not a good predictor of distortion thresholds or suprathreshold perceived distortion. Some simple pointwise measures were in good agreement with psychophysical data; other more computationally intensive metrics involving spatial properties of the human visual system gave mixed results. It was determined that mean intensity, which is not accounted for in the JPEG algorithm, plays a significant role in perceived distortion

Seventy years of sex education in Health Education Journal: a critical review

This paper examines key debates and perspectives on sex education in Health Education Journal (HEJ), from the date of the journal’s first publication in March 1943 to the present day. Matters relating to sexuality and sexual health are revealed to be integral to HEJ’s history. First published as Health and Empire (1921 – 1942), a key purpose of the journal since its inception has been to share information on venereal disease and its prevention within the UK and across the former British Empire. From 1943 to the present day, discussions on sex education in the newly-christened HEJ both reflect and respond to evolving socio-cultural attitudes towards sexuality in the UK. Changing definitions of sex education across the decades are examined, from the prevention of venereal disease and moral decline in war-time Britain in the 1940s, to a range of responses to sexual liberation in the 1960s and 1970s; from a focus on preventing sexually-transmitted infections, teenage pregnancy and HIV in the 1980s, to the provision of sexual health services alongside sex education in the 2000s. Over the past 70 years, a shift from prevention of pre-marital sexual activity to the management of its outcomes is apparent; however, while these changes over time are notable, perhaps the most striking findings of this review are the continuities in arguments for and against the discussion of sexual issues. After more than 70 years of debate, it would seem that there is little consensus concerning motivations for and the content of sex education

Study of a Distributed Picture Archiving and Communication System for Radiology

A preliminary design study has been carried out for a distributed picture archiving and communication system for the Mallinckrodt Institute of Radiology. The study develops design equations for three layers of a picture network and examines the estimated flow of digital images between a multiplicity of picture sources, picture archives and picture viewing stations. Application of these data to the design equations lead to some preliminary conclusions. One network architecture consistent with these conclusions is discussed