China's population figures: can the contradictions be resolved?
In recent years, the government of the People's Republic of China has been reporting the country's population as "nearly 800 million." A variety of evidence suggests that this approximation is the best currently available in China, and that it may be some time before further, more accurate, demographic data are produced. The paper presents and discusses alternate population estimates and projections by UN, US, and USSR specialists.
China's experience on population control: The elusive model
Abstract After the Cultural Revolution China initiated a very intensive family planning programme. Although statistical data are not available, there is enough information to conclude that the custom of postponing marriage and planning births is gaining momentum. The new socio-economic environment is much more conducive to the acceptance of family planning by the young adults than was the case in previous campaigns. Contraceptives, abortions and sterilizations are free of charge and readily available through the extensive public health system. Most important to the success of the programme are the unique methods of motivation which involve virtually all segments of the society.
Growth from Solutions
Growth from solutions is the crystallization of a compound whose chemical composition differs markedly from that of the initial liquid phase. Commonly used solvents are water, multicomponent aqueous or nonaqueous solutions, and melts of some chemical compounds. Differentiations are made based on growth temperatures and on the chemical nature of the solvent. In growth from low-temperature aqueous solutions, the temperatures generally do not exceed 80–90°C; in growth from superheated aqueous solutions (hydrothermal method), they reach 800°C, and in growth from salt melts (molten-salt, flux, or fluxed melt growth), they usually do not exceed 1200–1300°C, but sometimes reach 1500°C.