Seven kinds of weft knitted fabrics from glass fiber yarns were used as reinforcement to make fabric/epoxy composite laminates. Tensile tests were carried out to examine and compare the mechanical properties in course...Seven kinds of weft knitted fabrics from glass fiber yarns were used as reinforcement to make fabric/epoxy composite laminates. Tensile tests were carried out to examine and compare the mechanical properties in course and wale direction of these composites. On the basis of experimental results, attempts have been made to analyze some main factors influencing stress-strain curve, ultimate tensile strength and initial elastic modulus of specimens.展开更多
Several different kinds of weft knitted fabrics from glass fiber yarns were used as reinforcement to make fabric/polyester composite laminates. Flexural tests were carried out to examine stress- deflection process and...Several different kinds of weft knitted fabrics from glass fiber yarns were used as reinforcement to make fabric/polyester composite laminates. Flexural tests were carried out to examine stress- deflection process and compare the mechanical properties in course and wale directions of these composites. The experimental results indicate that the numbers of load-bearing yarn in course and wale direction and the fabric density are the main factors influencing the ultimate tensile strength and initial elastic modulus of specimens.展开更多
Dear Editor,In recent years,owing to the fact that antibiotic-resistant bacteria have become more and more prevalent,there has been a resurgence of interest in the use of bacteriophages.However,bacteriophage therapy r...Dear Editor,In recent years,owing to the fact that antibiotic-resistant bacteria have become more and more prevalent,there has been a resurgence of interest in the use of bacteriophages.However,bacteriophage therapy remains an underutilized option in modern medicine due to technical hurdles such as limited host range,narrow spectrum of bacteria展开更多
Geographic information systems (GIS) are a widely used tool in urban planning and management. More and more cities and decision-makers require its attributes of promptness, precision and visualization. But the applica...Geographic information systems (GIS) are a widely used tool in urban planning and management. More and more cities and decision-makers require its attributes of promptness, precision and visualization. But the application of GIS in urban environmental management is still a new field and relevant researches are getting on tardily. As a subsystem of GIS, an urban environmental management geographic information system (UEMGIS) should be a complex multi-discipline and multi-objective tool to perform quantitative multi-dimension analysis and to transfer the results into an expression legible to an ordinary user. It should be a dynamic system of prompt functions based on upgradable databases, and be composed of many subsystems respectively specialized in items about water, air, waste and noise as well as relative standards and regulations. However, existing UEMGISs mostly rely on the basic GIS too much to design the actual requirements of applications and managements in themselves, and the unavailability of sufficient fundamental data has retarded their improvement. In the design of a UEMGIS, the standardization of data classification should be taken into consideration to make the data exchangeable and shareable among its subsystems and within every subsystem, and the applicable error limits for input data should be defined in accordance with the user抯 required precision of data out. Data acquisition can be easy and quick if remote sensing, global positioning system (GPS) and other technologies are combined with GIS. Rapidly progressing information technologies have been giving a bright prospect for the melioration of UEMGIS that will have great potential and wide application in environmental conservation.展开更多
A one-dimensional BOD-DO coupling model for water quality simulation is presented, which adopts Streeter-Phelps equations and the theory of back-propagation artificial neural network. The water quality data of Yangtze...A one-dimensional BOD-DO coupling model for water quality simulation is presented, which adopts Streeter-Phelps equations and the theory of back-propagation artificial neural network. The water quality data of Yangtze River in the Chongqing region in the year of 1989 are divided into 5 groups and used in the learning and testing courses of this model. The result shows that such model is feasible for water quality simulation and is more accurate than traditional models.展开更多
在时尚圈内，有关又一个顶级设计师品牌开设酒店的话题可能已经让人提不起兴趣。不过，巴黎Maison Martin Margiela项目的新酒店却不在此列。虽然该品牌的全球知名度不如范思哲、阿玛尼（后两者均已开设品牌酒店），但其魅力在于它在利...在时尚圈内，有关又一个顶级设计师品牌开设酒店的话题可能已经让人提不起兴趣。不过，巴黎Maison Martin Margiela项目的新酒店却不在此列。虽然该品牌的全球知名度不如范思哲、阿玛尼（后两者均已开设品牌酒店），但其魅力在于它在利基市场的地位。这是一个时尚圈内部的时尚品牌，其鲜明的风格可能会让不知情者感觉莫名其妙。展开更多
By prescribing sea surface temperature anomalies(SSTAs)over eastern equatorial Pacific in January—March,the lag influence of ENSO(El Nino and La Nina)on monsoon over East Asia has been studied.The results suggest tha...By prescribing sea surface temperature anomalies(SSTAs)over eastern equatorial Pacific in January—March,the lag influence of ENSO(El Nino and La Nina)on monsoon over East Asia has been studied.The results suggest that,due to the excitation of atmospheric low-frequency oscillation by the SSTA,ENSO has significant lag influence on the monsoon over East Asia. During the summer after E1 Nino,the subtropical high over western Pacific is intensified and shows the northward and westward displacement,meanwhile,the rainfall over East China is below normal,especially in North China:during the winter after E1 Nino,both the Asian trough and the winter monsoon over East Asia are strengthened.During the summer after La Nina,the anomalous subtropical high prevails over the lower reaches of Yangtze(Changjiang)River,the rainfall between Yangtze and Huaihe Rivers is below normal:during the winter after La Nina, both the Asian trough and the winter monsoon over East Asia are weaker.Compared with La Nina,the effect of El Nino is stronger,but it is not always opposite to the one of La Nina.展开更多
文摘Seven kinds of weft knitted fabrics from glass fiber yarns were used as reinforcement to make fabric/epoxy composite laminates. Tensile tests were carried out to examine and compare the mechanical properties in course and wale direction of these composites. On the basis of experimental results, attempts have been made to analyze some main factors influencing stress-strain curve, ultimate tensile strength and initial elastic modulus of specimens.
文摘Several different kinds of weft knitted fabrics from glass fiber yarns were used as reinforcement to make fabric/polyester composite laminates. Flexural tests were carried out to examine stress- deflection process and compare the mechanical properties in course and wale directions of these composites. The experimental results indicate that the numbers of load-bearing yarn in course and wale direction and the fabric density are the main factors influencing the ultimate tensile strength and initial elastic modulus of specimens.
基金supported by the Natural Science Foundation of China(30571637)
文摘Dear Editor,In recent years,owing to the fact that antibiotic-resistant bacteria have become more and more prevalent,there has been a resurgence of interest in the use of bacteriophages.However,bacteriophage therapy remains an underutilized option in modern medicine due to technical hurdles such as limited host range,narrow spectrum of bacteria
基金Funded by National Nature Science Foundation of China (Nos. 59978054 and 59838300)
文摘Geographic information systems (GIS) are a widely used tool in urban planning and management. More and more cities and decision-makers require its attributes of promptness, precision and visualization. But the application of GIS in urban environmental management is still a new field and relevant researches are getting on tardily. As a subsystem of GIS, an urban environmental management geographic information system (UEMGIS) should be a complex multi-discipline and multi-objective tool to perform quantitative multi-dimension analysis and to transfer the results into an expression legible to an ordinary user. It should be a dynamic system of prompt functions based on upgradable databases, and be composed of many subsystems respectively specialized in items about water, air, waste and noise as well as relative standards and regulations. However, existing UEMGISs mostly rely on the basic GIS too much to design the actual requirements of applications and managements in themselves, and the unavailability of sufficient fundamental data has retarded their improvement. In the design of a UEMGIS, the standardization of data classification should be taken into consideration to make the data exchangeable and shareable among its subsystems and within every subsystem, and the applicable error limits for input data should be defined in accordance with the user抯 required precision of data out. Data acquisition can be easy and quick if remote sensing, global positioning system (GPS) and other technologies are combined with GIS. Rapidly progressing information technologies have been giving a bright prospect for the melioration of UEMGIS that will have great potential and wide application in environmental conservation.
基金Funded by the National Natural Science Foundation of China (No.59838300 No.59778021)
文摘A one-dimensional BOD-DO coupling model for water quality simulation is presented, which adopts Streeter-Phelps equations and the theory of back-propagation artificial neural network. The water quality data of Yangtze River in the Chongqing region in the year of 1989 are divided into 5 groups and used in the learning and testing courses of this model. The result shows that such model is feasible for water quality simulation and is more accurate than traditional models.
文摘在时尚圈内，有关又一个顶级设计师品牌开设酒店的话题可能已经让人提不起兴趣。不过，巴黎Maison Martin Margiela项目的新酒店却不在此列。虽然该品牌的全球知名度不如范思哲、阿玛尼（后两者均已开设品牌酒店），但其魅力在于它在利基市场的地位。这是一个时尚圈内部的时尚品牌，其鲜明的风格可能会让不知情者感觉莫名其妙。
基金国家重点基础研究发展计划(973计划)，Prediction Theory of Severe Climate Disasters in China，科技部"攀登计划"
文摘By prescribing sea surface temperature anomalies(SSTAs)over eastern equatorial Pacific in January—March,the lag influence of ENSO(El Nino and La Nina)on monsoon over East Asia has been studied.The results suggest that,due to the excitation of atmospheric low-frequency oscillation by the SSTA,ENSO has significant lag influence on the monsoon over East Asia. During the summer after E1 Nino,the subtropical high over western Pacific is intensified and shows the northward and westward displacement,meanwhile,the rainfall over East China is below normal,especially in North China:during the winter after E1 Nino,both the Asian trough and the winter monsoon over East Asia are strengthened.During the summer after La Nina,the anomalous subtropical high prevails over the lower reaches of Yangtze(Changjiang)River,the rainfall between Yangtze and Huaihe Rivers is below normal:during the winter after La Nina, both the Asian trough and the winter monsoon over East Asia are weaker.Compared with La Nina,the effect of El Nino is stronger,but it is not always opposite to the one of La Nina.
