Coral sandy soils widely exist in coral island reefs and seashores in tropical and subtropical regions.Due to the unique marine depositional environment of coral sandy soils,the engineering characteristics and respons...Coral sandy soils widely exist in coral island reefs and seashores in tropical and subtropical regions.Due to the unique marine depositional environment of coral sandy soils,the engineering characteristics and responses of these soils subjected to monotonic and cyclic loadings have been a subject of intense interest among the geotechnical and earthquake engineering communities.This paper critically reviews the progress of experimental investigations on the undrained behavior of coral sandy soils under monotonic and cyclic loadings over the last three decades.The focus of coverage includes the contractive-dilative behavior,the pattern of excess pore-water pressure(EPWP)generation and the liquefaction mechanism and liquefaction resistance,the small-strain shear modulus and strain-dependent shear modulus and damping,the cyclic softening feature,and the anisotropic characteristics of undrained responses of saturated coral sandy soils.In particular,the advances made in the past decades are reviewed from the following aspects:(1)the characterization of factors that impact the mechanism and patterns of EPWP build-up;(2)the identification of liquefaction triggering in terms of the apparent viscosity and the average flow coefficient;(3)the establishment of the invariable form of strain-based,stress-based,or energy-based EPWP ratio formulas and the unique relationship between the new proxy of liquefaction resistance and the number of cycles required to reach liquefaction;(4)the establishment of the invariable form of the predictive formulas of small strain modulus and strain-dependent shear modulus;and(5)the investigation on the effects of stress-induced anisotropy on liquefaction susceptibility and dynamic deformation characteristics.Insights gained through the critical review of these advances in the past decades offer a perspective for future research to further resolve the fundamental issues concerning the liquefaction mechanism and responses of coral sandy sites subjected to cyclic loadings associated with seismic events in marine environments.展开更多
Tripterygium wilfordii (TW) was reported by LI Lei-shi, et al in 1981 to have marked effect in reducing proteinuria when it was used to treat glomerular nephritis, and the conclusion they worked out has been now accep...Tripterygium wilfordii (TW) was reported by LI Lei-shi, et al in 1981 to have marked effect in reducing proteinuria when it was used to treat glomerular nephritis, and the conclusion they worked out has been now accepted by most of nephrologists in 20-year experimental studies and wide application in clinical practice. Its mechanism, adverse reaction and mutagenesis effects, and dosage in clinical application in the recent years are now briefly reviewed in this paper.展开更多
Prosperous Satellite Communications China is the birthplace of therocket.In the twelfth century,China began creating and usingthe rocket,which was believedthe oldest vehicle in the world.Its invention and creation dem...Prosperous Satellite Communications China is the birthplace of therocket.In the twelfth century,China began creating and usingthe rocket,which was believedthe oldest vehicle in the world.Its invention and creation demon-strates the outstanding intelli-gence and ability of the ancientChinese people. The splendid ancient civiliza-tions of China and other countriesjointly carried within themselvesthe seeds of modern space tech-nology.Through unremitting ef-forts of several thousand years,people’s good wish to fly into andexplore sapce has at last cometrue.Space technology has be-come an area which uses the展开更多
The rise of scientific computing was one of the most important advances in the S&T progress during the second half of the 20th century. Parallel with theoretical exploration and scientific experiments,scientific c...The rise of scientific computing was one of the most important advances in the S&T progress during the second half of the 20th century. Parallel with theoretical exploration and scientific experiments,scientific computing has become the 'third means' for scientific activities in the world today. The article gives a panoramic review of the subject during the past 50 years in China and lists the contributions made by Chinese scientists in this field. In addition, it reveals some key contents of related projects in the national research plan and looks into the development vista for the subject in China at the dawning years of the new century.展开更多
Although in 2010 textile industry still faces a series of uncertain factors, and export growth is difficult to recover in a short time, the domestic market will continue to play a significant role in the industry, str...Although in 2010 textile industry still faces a series of uncertain factors, and export growth is difficult to recover in a short time, the domestic market will continue to play a significant role in the industry, structure adjustment and industrial upgrading will be carried out further in the nation. In the condition of the gradually stable international market environment, rebound can be seen in Chinese textile industry.展开更多
China is a country of high seismicity with many hydropower resources. Recently,a series of high arch dams have either been completed or are being constructed in seismic regions,of which most are concrete dams. The eva...China is a country of high seismicity with many hydropower resources. Recently,a series of high arch dams have either been completed or are being constructed in seismic regions,of which most are concrete dams. The evaluation of seismic safety often becomes a critical problem in dam design. In this paper,a brief introduction to major progress in the research on seismic aspects of large concrete dams,conducted mainly at the Institute of Water Resources and Hydropower Research(IWHR) during the past 60 years,is presented. The dam site-specific ground motion input,improved response analysis,dynamic model test verification,field experiment investigations,dynamic behavior of dam concrete,and seismic monitoring and observation are described. Methods to prevent collapse of high concrete dams under maximum credible earthquakes are discussed.展开更多
This paper attempts to give a brief introduction to the TEFL situation in primary and middle schools of Guangdong Province and then put forward some ideas for a TEFL development plan for the coming five years. The poi...This paper attempts to give a brief introduction to the TEFL situation in primary and middle schools of Guangdong Province and then put forward some ideas for a TEFL development plan for the coming five years. The points of view and propositions presented are only the author’s personal opinions.Guangdong Province, located in the south of China, with a comparatively developed culture and economy, is one of the provinces in China whose trade relations with foreign countries can be traced back to a time as early as the Tang Dynasty. Hence, it not only has the country’s most well-known home-towns of overseas Chinese, but also keeps close relations with the outside world and consequently has had a better foundation of foreign language education in the past. Nevertheless, for a long period of time since the founding of the PRC, owing to various reasons, the quality of foreign languages teaching and learning has been very unsatisfactory. The present situation of TEFL is still far from suits the urgent needs of economic and social development today.展开更多
基金National Natural Science Foundation of China under Grant No.52278503。
文摘Coral sandy soils widely exist in coral island reefs and seashores in tropical and subtropical regions.Due to the unique marine depositional environment of coral sandy soils,the engineering characteristics and responses of these soils subjected to monotonic and cyclic loadings have been a subject of intense interest among the geotechnical and earthquake engineering communities.This paper critically reviews the progress of experimental investigations on the undrained behavior of coral sandy soils under monotonic and cyclic loadings over the last three decades.The focus of coverage includes the contractive-dilative behavior,the pattern of excess pore-water pressure(EPWP)generation and the liquefaction mechanism and liquefaction resistance,the small-strain shear modulus and strain-dependent shear modulus and damping,the cyclic softening feature,and the anisotropic characteristics of undrained responses of saturated coral sandy soils.In particular,the advances made in the past decades are reviewed from the following aspects:(1)the characterization of factors that impact the mechanism and patterns of EPWP build-up;(2)the identification of liquefaction triggering in terms of the apparent viscosity and the average flow coefficient;(3)the establishment of the invariable form of strain-based,stress-based,or energy-based EPWP ratio formulas and the unique relationship between the new proxy of liquefaction resistance and the number of cycles required to reach liquefaction;(4)the establishment of the invariable form of the predictive formulas of small strain modulus and strain-dependent shear modulus;and(5)the investigation on the effects of stress-induced anisotropy on liquefaction susceptibility and dynamic deformation characteristics.Insights gained through the critical review of these advances in the past decades offer a perspective for future research to further resolve the fundamental issues concerning the liquefaction mechanism and responses of coral sandy sites subjected to cyclic loadings associated with seismic events in marine environments.
文摘Tripterygium wilfordii (TW) was reported by LI Lei-shi, et al in 1981 to have marked effect in reducing proteinuria when it was used to treat glomerular nephritis, and the conclusion they worked out has been now accepted by most of nephrologists in 20-year experimental studies and wide application in clinical practice. Its mechanism, adverse reaction and mutagenesis effects, and dosage in clinical application in the recent years are now briefly reviewed in this paper.
文摘Prosperous Satellite Communications China is the birthplace of therocket.In the twelfth century,China began creating and usingthe rocket,which was believedthe oldest vehicle in the world.Its invention and creation demon-strates the outstanding intelli-gence and ability of the ancientChinese people. The splendid ancient civiliza-tions of China and other countriesjointly carried within themselvesthe seeds of modern space tech-nology.Through unremitting ef-forts of several thousand years,people’s good wish to fly into andexplore sapce has at last cometrue.Space technology has be-come an area which uses the
文摘The rise of scientific computing was one of the most important advances in the S&T progress during the second half of the 20th century. Parallel with theoretical exploration and scientific experiments,scientific computing has become the 'third means' for scientific activities in the world today. The article gives a panoramic review of the subject during the past 50 years in China and lists the contributions made by Chinese scientists in this field. In addition, it reveals some key contents of related projects in the national research plan and looks into the development vista for the subject in China at the dawning years of the new century.
文摘Although in 2010 textile industry still faces a series of uncertain factors, and export growth is difficult to recover in a short time, the domestic market will continue to play a significant role in the industry, structure adjustment and industrial upgrading will be carried out further in the nation. In the condition of the gradually stable international market environment, rebound can be seen in Chinese textile industry.
文摘China is a country of high seismicity with many hydropower resources. Recently,a series of high arch dams have either been completed or are being constructed in seismic regions,of which most are concrete dams. The evaluation of seismic safety often becomes a critical problem in dam design. In this paper,a brief introduction to major progress in the research on seismic aspects of large concrete dams,conducted mainly at the Institute of Water Resources and Hydropower Research(IWHR) during the past 60 years,is presented. The dam site-specific ground motion input,improved response analysis,dynamic model test verification,field experiment investigations,dynamic behavior of dam concrete,and seismic monitoring and observation are described. Methods to prevent collapse of high concrete dams under maximum credible earthquakes are discussed.
文摘This paper attempts to give a brief introduction to the TEFL situation in primary and middle schools of Guangdong Province and then put forward some ideas for a TEFL development plan for the coming five years. The points of view and propositions presented are only the author’s personal opinions.Guangdong Province, located in the south of China, with a comparatively developed culture and economy, is one of the provinces in China whose trade relations with foreign countries can be traced back to a time as early as the Tang Dynasty. Hence, it not only has the country’s most well-known home-towns of overseas Chinese, but also keeps close relations with the outside world and consequently has had a better foundation of foreign language education in the past. Nevertheless, for a long period of time since the founding of the PRC, owing to various reasons, the quality of foreign languages teaching and learning has been very unsatisfactory. The present situation of TEFL is still far from suits the urgent needs of economic and social development today.
