World Bank, U.S. at odds on population

As the Reagan Administration issued a statement for a U.N. population conference concerning U.S. plans to halt foreign aid to nongovernmental organizations that "perform or actively promote" abortions, several reports appeared about problems which developing nations face in contending with rapid population growth. The World Bank's World Development Report 1984 analyzes population and development trends, argues for providing more aid for population programs, and recounts what has happened in countries where abortion has been outlawed. A National Research Council report documents China's rapid fertility drop since its 1969 antinatalist campaign began. A Population Reports International report advocates housing, education, and incentive-based family planning programs in developing countries.     

超高产条件下种植密度对泰山21号群体动态、干物质积累和产量的影响

研究了泰山21号的单株最大产量潜力和7个种植密度下的群体动态、产量性状和干物质积累情况。结果表明,在不同的种植密度下,泰山21号的分蘖动态和鲁麦14号有明显的区别,干物质积累和产量都明显高于鲁麦14号,尤其是在拔节至抽穗期和抽穗到成熟期的干物质积累明显高于鲁麦14号,且在耐密性和抗倒性上表现出较大的优势。当基本苗为120-180万/hm2时,泰山21号产量达到最高。     

Technological trends in automobiles

Current technological trends in the automotive industry reflect many diverse disciplines. Electronics and microprocessors, new engine transmission concepts, composite and ceramic materials, and computer-aided design and manufacture will combine to make possible the creation of advanced automobiles offering outstanding quality, fuel economy, and performance. A projected "average" vehicle of the 1990's is described to illustrate the application of these new concepts.     

Population trends and prospects

For the next 20 years there is likely to be a slowing of population growth rates for all areas of the world except Africa. The present population of developed countries is expected to increase by about 12 percent by the year 2000; that of all developing countries is expected to increase by about 50 percent. The momentum of population growth is strong; a few analysts suggest that growth may cease at 8 billion, but a figure of more than 10 billion seems much more likely.