The Radio over Fiber (RoF) communication technology combines the technical advantages of both fiber communication and wireless mobile communication to solve the problems of bandwidth,flexibility and electromagnetic in...The Radio over Fiber (RoF) communication technology combines the technical advantages of both fiber communication and wireless mobile communication to solve the problems of bandwidth,flexibility and electromagnetic interference.Research of the technology is drawing wide concerns around the world.However,high cost becomes a drawback of this technology at present.In this article the RoF Multi-System Access (RoFMA) scheme is proposed.The scheme makes use of the Optical Time Division Multiplexing (OTDM) and multi-system multiplex/de-multiplex technologies to lower the access cost.The article also predicts good development and market prospect of the RoFMA technology.展开更多
China is a large developing country with rapid growth rate. To the year 2050, its electric power will be increased by six to eight times, reaching 1.5—1.8 TW total installed capacity. The development can not only rel...China is a large developing country with rapid growth rate. To the year 2050, its electric power will be increased by six to eight times, reaching 1.5—1.8 TW total installed capacity. The development can not only rely on the existing technology, it is crucial to accelerate the new technology development. This article discusses the perspective of various new technologies from the available energy resources and the required increase of electric power.展开更多
In this paper the history of welding technology and the current status in China was reviewed, and based on the situation the developmental trend was prospected.
The optical communication technology features low cost,wide band,low loss,and anti-electromagnetic interference performance.By combining the optical communication technology with the radio millimeter wave communicatio...The optical communication technology features low cost,wide band,low loss,and anti-electromagnetic interference performance.By combining the optical communication technology with the radio millimeter wave communication system,the Millimeter Wave Radio over Fiber (MM-RoF) system boasts a lot of advantages,including wide band,small size,light weight,low cost,low loss,and resistance of electromagnetic interference as well as high transmission quality.The MM-RoF technology solves the problems faced by traditional microwave transmission system at the millimeter wave band,namely,high loss and inability to resist interference efficiently.Meanwhile,it puts an end to the bottleneck of millimeter wave electronic devices and thus is deemed as with great potentials.The MM-ROF technology that supports multiple formats and services signifies one of the significant trends for future development of the MM-RoF system.展开更多
In the next 15 years, world trade will maintain considerably high growth, and it is predicted that the annual growth rate of the world’s commodity trade will be 6％. It is expected that the total volume of the world...In the next 15 years, world trade will maintain considerably high growth, and it is predicted that the annual growth rate of the world’s commodity trade will be 6％. It is expected that the total volume of the world’s commodity trade will reach US$5.6 trillion in the year 2000; and this figure will rise to US$10tillion in 2010. The development trend in commodity composition shows that the trade volume of manufactured goods continues to expand, the market for primary goods is declining, and mechano-electrical products, especially high-value technical products, will be the items with the highest predicted growth in展开更多
Metal resources are important resources for national production and life, and prospecting technology has laid an important foundation for the exploration of metal mines. By improving the prospecting technology, not on...Metal resources are important resources for national production and life, and prospecting technology has laid an important foundation for the exploration of metal mines. By improving the prospecting technology, not only can the production of metallic substances in metallic minerals be increased, but also the economic benefits of enterprises related to metallic minerals can be increased, thus promoting the development of Chinas social economy. Based on this, this paper explores the development direction and innovative ideas of geological prospecting technology in metal ore exploration by analyzing the related technologies and influencing factors of geological prospecting technology in metal ore exploration, so as to ensure that it can provide more advanced technologies for metal ore exploration and prospecting in China, and make Chinas metal resources richer.展开更多
In the production process of coal mines, water prevention and control is one of the important factors that affect the safety in production. The water prevention and control effect is fully guaranteed and plays a key r...In the production process of coal mines, water prevention and control is one of the important factors that affect the safety in production. The water prevention and control effect is fully guaranteed and plays a key role in the safety in production of coal mines. As one of the main energy sources, coal has a large number of mined-out areas due to long-term mining. Due to the differences in geological conditions, it is necessary to apply the comprehensive geophysical exploration technology scientifically and reasonably to provide technical support for water prevention and control. In this paper, the commonly used geophysical techniques are discussed respectively, and the application of integrated geophysical techniques is studied in order to improve the effect of water prevention and control in coal mines.展开更多
There is a long tradition of friendly exchange and cooperation between the Chinese Academy of Sciences (CAS) and the universities in Hong Kong. In recent years, both sides have been increasingly realizing the importan...There is a long tradition of friendly exchange and cooperation between the Chinese Academy of Sciences (CAS) and the universities in Hong Kong. In recent years, both sides have been increasingly realizing the importance of furthering their Collaboration and exchange and the cooperation has become more active, laying greater展开更多
For China,at the turn of the century,how to keep the position of the space power,how to stimulate the enthusiasm of the space technicians and how to keep pace with the world space technology,all of these questions lie...For China,at the turn of the century,how to keep the position of the space power,how to stimulate the enthusiasm of the space technicians and how to keep pace with the world space technology,all of these questions lie ahead of the Chinese people.So we may say China’s space industry now is in the key stage.If the space industry draws great attention from the central government and the people of the country,it will have a brilliant future in the 21st century.We should put our eyes on the 21st century and prepare to explore space resources.It is difficult for us to keep pace with the times if we do not explore space resources and try to earn "the money in space".展开更多
Since ancient times, the mining and excavation of minerals have been highly valued by all countries, which have played an important role in national development and social production and life. As early as 1970s and 19...Since ancient times, the mining and excavation of minerals have been highly valued by all countries, which have played an important role in national development and social production and life. As early as 1970s and 1980s, China began to vigorously develop the mining industry, among which the excavation of Daqing Oilfield is more famous, and it can still provide a steady stream of petroleum minerals today. In the past, some safety accidents often occurred in the process of mineral exploitation projects, resulting in casualties and economic losses, which were a kind of loss to the society and the industry. The emergence of geological exploration technology for mineral exploitation made people hope to reduce the risk coefficient of mineral exploitation and improve the efficiency of mineral exploitation, and had an optimized direction. In this paper, the concept and application of geological exploration technology, as well as a series of problems and obstacles will be discussed, combined with examples of remote sensing exploration technology, hoping to provide some reference for future mineral exploration.展开更多
With the development of geological research in China, more and more workers will effectively integrate the science and technology of geological prospecting and exploration, so as to promote the development of geologic...With the development of geological research in China, more and more workers will effectively integrate the science and technology of geological prospecting and exploration, so as to promote the development of geological management to the maximum extent. In the specific implementation process, technicians should understand the distribution of mineral resources, integrate the technical structure and basic rules of prospecting with science and technology, follow the principles of prospecting and exploration technology, and seek innovative application means. At the same time, the rapid development of modern science and technology brings good news to the geological exploration industry, and comprehensively uses various modern technical means to promote the continuous improvement of geological exploration technology level. This is an important work that exploration units and practitioners are committed to.展开更多
This paper is based on the existing status and development prediction of Fujian power industry, and describes that the structure of energy sources for generating power which will mainly use coal, will not be changed i...This paper is based on the existing status and development prediction of Fujian power industry, and describes that the structure of energy sources for generating power which will mainly use coal, will not be changed in the 2010s and 2020s in Fujian Province. In order to meet the requirements of high efficiency and envirofimental protection, the usage of clean coal technologies for power generating will be an inevitable option and the technologies will occupy the important position in Fujian power industry. This paper puts forward the staged targets and measures of developing and utilizing clean coal technologies, suggests that all government depotments related should give support and guarantee in policies and conditions, and welcome technical and economic cooperation at home and abroad, which is good for co-development of both parties.展开更多
The Ordos basin is rich in oil and gas resources. The structures in the basin are generally rather gentle. Most of the oil and gas pools already found are belong to the types of lithologic, lithostratigraphic and pale...The Ordos basin is rich in oil and gas resources. The structures in the basin are generally rather gentle. Most of the oil and gas pools already found are belong to the types of lithologic, lithostratigraphic and paleo-geomorphic with thin reservoirs. The geology of oil and gas and the generation and distribution of oil and gas resources in the Ordos basin is analyzed in detail in the paper. It is also pointed out in the paper that what direction should be taken in oil and gas exploration in the basin, and that the important role of the seismic prospecting technologies in the discovery of large oil and gas fields in the basin could not be replaced.展开更多
基金supported by the National Natural Science Foundation under Grant No.60736003
文摘The Radio over Fiber (RoF) communication technology combines the technical advantages of both fiber communication and wireless mobile communication to solve the problems of bandwidth,flexibility and electromagnetic interference.Research of the technology is drawing wide concerns around the world.However,high cost becomes a drawback of this technology at present.In this article the RoF Multi-System Access (RoFMA) scheme is proposed.The scheme makes use of the Optical Time Division Multiplexing (OTDM) and multi-system multiplex/de-multiplex technologies to lower the access cost.The article also predicts good development and market prospect of the RoFMA technology.
文摘China is a large developing country with rapid growth rate. To the year 2050, its electric power will be increased by six to eight times, reaching 1.5—1.8 TW total installed capacity. The development can not only rely on the existing technology, it is crucial to accelerate the new technology development. This article discusses the perspective of various new technologies from the available energy resources and the required increase of electric power.
文摘In this paper the history of welding technology and the current status in China was reviewed, and based on the situation the developmental trend was prospected.
基金supported by the National Natural Science Foundation under Grant No.60736003the National Basic Research Program of China("973" Program)under Grant No.2006CB302800
文摘The optical communication technology features low cost,wide band,low loss,and anti-electromagnetic interference performance.By combining the optical communication technology with the radio millimeter wave communication system,the Millimeter Wave Radio over Fiber (MM-RoF) system boasts a lot of advantages,including wide band,small size,light weight,low cost,low loss,and resistance of electromagnetic interference as well as high transmission quality.The MM-RoF technology solves the problems faced by traditional microwave transmission system at the millimeter wave band,namely,high loss and inability to resist interference efficiently.Meanwhile,it puts an end to the bottleneck of millimeter wave electronic devices and thus is deemed as with great potentials.The MM-ROF technology that supports multiple formats and services signifies one of the significant trends for future development of the MM-RoF system.
文摘In the next 15 years, world trade will maintain considerably high growth, and it is predicted that the annual growth rate of the world’s commodity trade will be 6％. It is expected that the total volume of the world’s commodity trade will reach US$5.6 trillion in the year 2000; and this figure will rise to US$10tillion in 2010. The development trend in commodity composition shows that the trade volume of manufactured goods continues to expand, the market for primary goods is declining, and mechano-electrical products, especially high-value technical products, will be the items with the highest predicted growth in
文摘Metal resources are important resources for national production and life, and prospecting technology has laid an important foundation for the exploration of metal mines. By improving the prospecting technology, not only can the production of metallic substances in metallic minerals be increased, but also the economic benefits of enterprises related to metallic minerals can be increased, thus promoting the development of Chinas social economy. Based on this, this paper explores the development direction and innovative ideas of geological prospecting technology in metal ore exploration by analyzing the related technologies and influencing factors of geological prospecting technology in metal ore exploration, so as to ensure that it can provide more advanced technologies for metal ore exploration and prospecting in China, and make Chinas metal resources richer.
文摘In the production process of coal mines, water prevention and control is one of the important factors that affect the safety in production. The water prevention and control effect is fully guaranteed and plays a key role in the safety in production of coal mines. As one of the main energy sources, coal has a large number of mined-out areas due to long-term mining. Due to the differences in geological conditions, it is necessary to apply the comprehensive geophysical exploration technology scientifically and reasonably to provide technical support for water prevention and control. In this paper, the commonly used geophysical techniques are discussed respectively, and the application of integrated geophysical techniques is studied in order to improve the effect of water prevention and control in coal mines.
文摘There is a long tradition of friendly exchange and cooperation between the Chinese Academy of Sciences (CAS) and the universities in Hong Kong. In recent years, both sides have been increasingly realizing the importance of furthering their Collaboration and exchange and the cooperation has become more active, laying greater
文摘For China,at the turn of the century,how to keep the position of the space power,how to stimulate the enthusiasm of the space technicians and how to keep pace with the world space technology,all of these questions lie ahead of the Chinese people.So we may say China’s space industry now is in the key stage.If the space industry draws great attention from the central government and the people of the country,it will have a brilliant future in the 21st century.We should put our eyes on the 21st century and prepare to explore space resources.It is difficult for us to keep pace with the times if we do not explore space resources and try to earn "the money in space".
文摘Since ancient times, the mining and excavation of minerals have been highly valued by all countries, which have played an important role in national development and social production and life. As early as 1970s and 1980s, China began to vigorously develop the mining industry, among which the excavation of Daqing Oilfield is more famous, and it can still provide a steady stream of petroleum minerals today. In the past, some safety accidents often occurred in the process of mineral exploitation projects, resulting in casualties and economic losses, which were a kind of loss to the society and the industry. The emergence of geological exploration technology for mineral exploitation made people hope to reduce the risk coefficient of mineral exploitation and improve the efficiency of mineral exploitation, and had an optimized direction. In this paper, the concept and application of geological exploration technology, as well as a series of problems and obstacles will be discussed, combined with examples of remote sensing exploration technology, hoping to provide some reference for future mineral exploration.
文摘With the development of geological research in China, more and more workers will effectively integrate the science and technology of geological prospecting and exploration, so as to promote the development of geological management to the maximum extent. In the specific implementation process, technicians should understand the distribution of mineral resources, integrate the technical structure and basic rules of prospecting with science and technology, follow the principles of prospecting and exploration technology, and seek innovative application means. At the same time, the rapid development of modern science and technology brings good news to the geological exploration industry, and comprehensively uses various modern technical means to promote the continuous improvement of geological exploration technology level. This is an important work that exploration units and practitioners are committed to.
文摘This paper is based on the existing status and development prediction of Fujian power industry, and describes that the structure of energy sources for generating power which will mainly use coal, will not be changed in the 2010s and 2020s in Fujian Province. In order to meet the requirements of high efficiency and envirofimental protection, the usage of clean coal technologies for power generating will be an inevitable option and the technologies will occupy the important position in Fujian power industry. This paper puts forward the staged targets and measures of developing and utilizing clean coal technologies, suggests that all government depotments related should give support and guarantee in policies and conditions, and welcome technical and economic cooperation at home and abroad, which is good for co-development of both parties.
文摘The Ordos basin is rich in oil and gas resources. The structures in the basin are generally rather gentle. Most of the oil and gas pools already found are belong to the types of lithologic, lithostratigraphic and paleo-geomorphic with thin reservoirs. The geology of oil and gas and the generation and distribution of oil and gas resources in the Ordos basin is analyzed in detail in the paper. It is also pointed out in the paper that what direction should be taken in oil and gas exploration in the basin, and that the important role of the seismic prospecting technologies in the discovery of large oil and gas fields in the basin could not be replaced.
