Local Chemical Environments and the Phonon Partial Densities of States of 57Fe in 57Fe3Al

Inelastic nuclear resonant scattering spectra were measured on alloys of Fe3Al that were chemically disordered, partially ordered, and D03 ordered. The features in the phonon partial density of states of 57Fe were found to change systematically with chemical short-range order in the alloy. Changes in the phonon partial density of states were modeled successfully by assigning vibrational spectra to 57Fe atoms in different first-nearest-neighbor chemical environments

Latin America and the Caribbean region population projections : 1990-91

This paper provides population projections for each country, economy, or territory in one World Bank region, as well as for nonborrower countries in the same geographic area. The Latin American and the Caribbean region is demographically at an intermediate stage. Fertility has declined to between 3 and 4 children per woman in all subregions as contraceptive use has continued to broaden. Life expectancy has risen to between 65 and 69, or about 10 years below countries with the most favorable mortality conditions. Some countries in the region have advanced to replacement level fertility; a few others are just starting the fertility transition. The projections show all countries in the region completing the transition by 2030 - the earliest of all regions. In this 1990-91 edition, projects are provided in a new format to permit the inclusion of data on recent demographic trends. Projection methods have changed only marginally since the previous edition. Essentially, recent country-specific data about levels and trends in fertility, mortality, and international migration are applied to available age-sex distributions in order to obtain short-run projections. Long-run projections, up to 2150, are also made under the assumptions that fertility and mortality eventually become stable and net international migration declines to zero.Demographics,Health Indicators,Health Information&Communications Technologies,,Country Population Profiles

Asia region population projections : 1989-90 edition

Of the 90 million people added to world population this year, half live in the Asia region. Asia's contribution to world population growth is proportional to its size and dwarfs the contribution of every other region. The scale of this contribution may be illustrated by the fact that India is adding to its population every year as many people as live in Australia. This paper studies population projections, covering almost two centuries from 1985 to 2150. The length of the projection period was chosen to allow populations to approach stability, which for several takes essentially the entire period. The paper begins with an introduction which explains what projection results are provided in the detailed tables, describes the projection methodology, and summarizes and interprets the main results.Health Monitoring&Evaluation,Health Indicators,Health Information&Communications Technologies,,Demographics

Africa region population projections : 1989-90 edition

The majority of populations in the Sub Saharan Africa region are growing rapidly. In some countries, where the average woman continues to have seven or more births, growth is as rapid as 4 percent a year. The population of the region as a whole is likely to double in slightly more than two decades, and after that, the region will be contributing more to annual world population growth than the far larger Asia region. The projections in this paper cover almost two centuries, from 1985 to 2150. The length of the projection period was chosen to allow populations to approach stability, which for several takes essentially the entire period. The paper begins with an introduction which explains what projection results are provided in the detailed tables, describes the projection methodology, and summarizes and interprets the main results.Health Information&Communications Technologies,,Demographics,Health Monitoring&Evaluation,Health Indicators

Africa region population projections : 1990-91

As recently as the mid-1970s, the Africa region had a smaller population than the Asia, the Latin American and the Caribbean, or the Europe, Middle East, and North Africa regions. Explosive population growth of more than 3 percent per year, projected to decline only gradually, will make Africa the second largest region by 2005. Its share of the world's population will increase from less than 10 percent now to 20 percent in the middle of the next century and to 25 percent when stationarity is finally reached. Vital rates vary relatively little among the subregions of sub-Saharan Africa. Fertility is uniformly high, with the total fertility rate higher than 6 children per woman. Linked with high fertility are high infant mortality rates, which are above 100 per thousand births for subregions. A few countries - Botswana, Zimbabwe, and Kenya - are leading the way in the African fertility transition. Recent fertility surveys in these countries show an increase in the use of contraceptives and the first evidence of fertility decline. It is assumed in the projections that this trend will spread to other countries. Most African governments now report their country's population growth rates as too high.Demographics,Health Indicators,Health Information&Communications Technologies,,Earth Sciences&GIS

Europe, Middle East, and North Africa (EMN) region population projections : 1989-90 edition

The population of the region is growing at 2.4 percent a year, second only to the Africa region, and should double in size in about 30 years. Regional growth would appear even more rapid were growth not offset by slow and even negative growth in the Eastern and Southern European countries included in the region. The projections of fertility and mortality are modeled on recent trends worldwide,and therefore incorporate the effects of deliberate efforts to reduce vital rates in various countries. Although altering projected trends is possible, it would require at least as much demographic interventions as in the recent past. The projections in the report cover almost two centuries, from 1985 to 2150. The length of the projection period was chosen to allow populations to approach stability, which for several takes essentially the entire period. The report begins with an introduction which explains what projection results are provided in the detailed tables, describes the projection methodology, and summarizes and interprets the main results.Demographics,Health Monitoring&Evaluation,Health Indicators,Health Information&Communications Technologies,

Asia region population projections : 1990-91 edition

Almost half the worlds population lives in Asia. This proportion is expected to decline to 40 percent by the end of the next century, mainly because of slowing growth in China. Other countries will continue to grow rapidly, and India, which adds more people every year than any other country, is project to surpass China in total population. Recent contraceptive prevalence surveys in several countries in the region show increasing proportions of couples using birth control. Fertility in these countries, mostly in Southeast Asia, has consequently declined rapidly. Population growth rates started to drop in many countries in the region in the past decade, but the momentum built in to the age structures of the populations will ensure continued population growth for many decades. Other countries in the region are lagging in fertility decline, and their populations will continue to grow at high rates. Infant and child mortality are the lowest in countries where fertility has declined.Earth Sciences&GIS,Demographics,Health Indicators,Health Information&Communications Technologies,

Atom clusters and vibrational excitations in chemically-disordered Pt357Fe

Inelastic nuclear resonant scattering spectra of Fe-57 atoms were measured on crystalline alloys of Pt3Fe-57 that were chemically disordered, partially ordered, and L1(2) ordered. Phonon partial density of states curves for Fe-57 were obtained from these spectra. Upon disordering, about 10% of the spectral intensity underwent a distinct shift from 25 to 19 meV. This change in optical modes accounted for most of the change of the vibrational entropy of disordering contributed by Fe atoms, which was (+0.10 +/- 0.03) k(B) (Fe atom)(-1). Prospects for parametrizing the vibrational entropy with low-order cluster variables were assessed. To calculate the difference in vibrational entropy of the disordered and ordered alloys, the clusters must be large enough to account for the abundances of several of the atom configurations of the first-nearest-neighbor shell about the Fe-57 atoms

Application of advanced technology to space automation

Automated operations in space provide the key to optimized mission design and data acquisition at minimum cost for the future. The results of this study strongly accentuate this statement and should provide further incentive for immediate development of specific automtion technology as defined herein. Essential automation technology requirements were identified for future programs. The study was undertaken to address the future role of automation in the space program, the potential benefits to be derived, and the technology efforts that should be directed toward obtaining these benefits

Plasma arginine vasopressin concentrations in epileptics under monotherapy

Plasma arginine vasopressin concentrations were determined by radio-immunoassay in 112 adult epileptics who were taking carbamazepine, phenytoin, primidone, or sodium valproate in long-term monotherapy, and in 19 controls. No significant difference was found between the groups, but some epileptics taking carbamazepine and primidone showed low values. Serum concentrations of carbamazepine did not correlate with the concentrations of plasma arginine vasopressin. In conclusion, there was no evidence of a stimulating effect of chronic carbamazepine medication or a special inhibiting effect of phenytoin on the release of vasopressin arginine from the posterior pituitary