两种基桩无损检测方法的比较

通过一个工程实例，对比了应力波反射法和地质雷达仪检测基桩的效果，阐明了地质雷达检测基桩桩身质量的独特优势。     

The delivery of family planning services in Egypt with particular reference to population policy and health care planning

Egypt's general population growth since 1805 is reviewed, with particular reference to the effect of changes in fertility and mortality since 1906 and factors affecting these variables. The rapidity of mortality decline is stressed and the nature of the epidemiological transition considered. In the light of population projections Egypt's population policies are described, and the diffusion of family planning since 1965 particularly is examined on a governorate basis. Finally, the success of the Population and Development Project set up in 1977 in instituting a radically new approach to family planning is presented.     

地球深部地震学研究进展

地球深部地震学研究进展索恩莱（美）梁慧云译全球地震学研究正系统地揭示着地球深部的结构、成分及动力学特征。最新的重大进展包括有：全球地幔内部不连续面的层析成象图、第一代地震粘滞性非球状模型，高分辨度的消减板三维图像，及核－幔边界附近复杂结构的图像。我们...