Numerical studies of collapsing interstellar clouds

Numerical simulation of the structure and evolution of interstellar clouds was initiated. Steps were taken toward an integrated treatment of the dynamical, thermal, and chemical processes entering model calculations. A detailed study was made of radiative transfer in molecular lines to allow model predictions to be tested against empirical data. The calculations have successfully reproduced and explained several observed cloud properties, including abundances of complex molecular species and the apparent depletion of CO in dense cores

The Formation of the First Stars in the Universe

In this review, I survey our current understanding of how the very first stars in the universe formed, with a focus on three main areas of interest: the formation of the first protogalaxies and the cooling of gas within them, the nature and extent of fragmentation within the cool gas, and the physics -- in particular the interplay between protostellar accretion and protostellar feedback -- that serves to determine the final stellar mass. In each of these areas, I have attempted to show how our thinking has developed over recent years, aided in large part by the increasing ease with which we can now perform detailed numerical simulations of primordial star formation. I have also tried to indicate the areas where our understanding remains incomplete, and to identify some of the most important unsolved problems.Comment: 74 pages, 4 figures. Accepted for publication in Space Science Review

Design and implementation of a program quality assessment tool : three case studies of primary health services in developing countries

The total service quality paradigm has been slow in diffusing to the health service domain, and TQM techniques are even less widely used to govern primary health services in the developing world. This interdisciplinary work analyzes the design of a TQM-based quality assessment tool (PQAT) used to evaluate quality of care in family planning programmes in Africa, Asia, and the South Pacific. It shows how family planning service quality models have failed to keep pace with advances in management theory, introduces the process theory model to overcome the limitations of the variance model, and grounds the tool in the context of quality theory. The paper goes on to report results from field use of the PQAT in three widely varying sites in the Asia Pacific region, and to draw useful conclusions for primary health researchers and practitioners