There is chaos in the Gulf region. Saudi Arabia in conjunction with the United Arab Emirates, Bahrain, Egypt and other gulf countries,suddenly cut off diplomatic relations with Qatar expelling diplomats and citizens, ...There is chaos in the Gulf region. Saudi Arabia in conjunction with the United Arab Emirates, Bahrain, Egypt and other gulf countries,suddenly cut off diplomatic relations with Qatar expelling diplomats and citizens, exerting blockades on land, sea and aviation on June 5, 2017, with the excuse that Qatar supports terrorism- and damages regional security. Sandi Arabia and other gulf countries have issued an ultimatum on June 23, giving Qatar to 10 days to meet their 13 requirements. For a time, the Saudi-led group became the media hot word. The Gulf, once a rare peaceful land under the impact of the Arab Spring, now falls into chaos. The GCC in fact has split. This is another major diplomatic adventure that Saudi Arabia has taken in recent years.展开更多
The poor households with profiles and cards are the important objects of the targeted poverty alleviation. The supporting work of the students with profiles and cards in colleges and universities is an important part ...The poor households with profiles and cards are the important objects of the targeted poverty alleviation. The supporting work of the students with profiles and cards in colleges and universities is an important part of the poverty alleviation in education. The university support should not only maintain in the economic and material support, but should also pay more attention to each student as the pillar of the socialist modernization in China, to fundamentally block the intergenerational transmission of the students with profiles and cards and their families. In fact, the path is to build up the supporting concept of the growth and development based on the students with cards and profiles, build a three-dimensional identification path, and establish and improve the tracking and evaluation mechanisms for the targeted funding.展开更多
Although global governance was not a widely recognizable concept until the end of the Cold War,its practice can be traced back to the history of international relations as some of the countries had the experience in s...Although global governance was not a widely recognizable concept until the end of the Cold War,its practice can be traced back to the history of international relations as some of the countries had the experience in solving common problems through transnational coordination.At present,"profound changes unseen for a century"call for more effective common solution on the global plane.展开更多
The paper summarizes the development of mobile communication of domestic and foreign railways,and proposes the priorities for tackling key technological problems of railway 5G private network according to the technica...The paper summarizes the development of mobile communication of domestic and foreign railways,and proposes the priorities for tackling key technological problems of railway 5G private network according to the technical routes of railway next-generation mobile communication determined by China State Railway Group Co.,Ltd.From the aspects of work objectives,principles,technical routes and innovative working methods,the paper elaborates the ideas of railway 5G scientific and technological research,puts forward the contents and plans of scientific and technological research on railway 5G private network,systematically organizes the achievements in the scientific and technological research stage of railway 5G private network,and sets forth the key contents of next-step scientific and technological research.展开更多
CHINA has lifted nearly 700 million people out of poverty in the past three decades and plans to eradicate domestic poverty by 2020. During this period, it has also been assisting African countries and other developin...CHINA has lifted nearly 700 million people out of poverty in the past three decades and plans to eradicate domestic poverty by 2020. During this period, it has also been assisting African countries and other developing nations to escape from the ravages of poverty. Zuo Changsheng, Director of the Inter- national Poverty Reduction Center in China （IPRCC）.展开更多
WHEN a Kenyan mother named her daughter Cotecxin, the story behind the name became something of a rural legend. In 1996. a pregnant woman from a village near Kisumu, the capital city of Nyanza Province in west Kenya, ...WHEN a Kenyan mother named her daughter Cotecxin, the story behind the name became something of a rural legend. In 1996. a pregnant woman from a village near Kisumu, the capital city of Nyanza Province in west Kenya, caught malignant malaria. If she took quinine, a Western medicine used to cure the disease, she would likely survive, but would either miscarry her pregnancy or have a baby with significant birth defects.展开更多
The Tibetan Plateau represents a unique landform with an average elevation that is higher than 4,000 m above sea level. Also known as the roof of the world and the Asian Water Tower, this topography preserves the larg...The Tibetan Plateau represents a unique landform with an average elevation that is higher than 4,000 m above sea level. Also known as the roof of the world and the Asian Water Tower, this topography preserves the largest ice mass as the solid water outside the Arctic and Antarctica. The Tibetan Plateau is a natural laboratory for research on multi-sphere interactions and for the study of humannature relationship. China conducted the first large and longstanding scientific expedition to this area between the 1970s and the 1990s and achieved fruitful scientific results.展开更多
This article discusses the market potential estimation results at different stages of second-generation oxy-fuel technology for carbon capture and storage,where oxygen content is increased in order to increase efficie...This article discusses the market potential estimation results at different stages of second-generation oxy-fuel technology for carbon capture and storage,where oxygen content is increased in order to increase efficiency and product life cycle.The article highlights the challenges to commercializing an energy technology with long development lead times.Challenges related to external market environment,regulations and market price for carbon dioxide(CO_(2))also need to be resolved.The study is based on a second-generation oxy-CFB technology evaluation,SWOT analysis and product life-cycle estimation.The commercialization of second-generation oxy-fuel technology,estimated as a basis of oxy-CFB technology,is largely found to be dependent on technical,sociological and economical aspects related to the energy market environment.The CO_(2) price in European Union(EU)emissions trading is currently below 10€/ton,which does not favour investment in CCS.CO_(2) storage also faces public opposition and EU directive limitations.The CO_(2) price needs to be in the range of 30€/ton by 2030,the estimated time of commercialization.Technological development or subsidies would also be required for the second-generation oxy-CFB power production concept to become viable.This is one of the critical factors in market deployment as the price development is influenced by several external factors,including the EU’s environmental policy,politics and public acceptance.展开更多
The sub-forum on standardization of new energy and direct-current diversified applications was held on July 9,which gathered leaders and experts to discuss how to thoroughly implement the national green power direct c...The sub-forum on standardization of new energy and direct-current diversified applications was held on July 9,which gathered leaders and experts to discuss how to thoroughly implement the national green power direct connection policy proposed in the transformation of the energy landscape,pool wisdom to tackle bottlenecks in the industrialization of DC technology,and leverage the role of standardization in coordinating and regulating the diversified applications of DC technology.It was designed to promote the establishment of a collaborative,open,and advanced global standards system for DC technology.展开更多
The world will continue to rely on scientists and technicians to tackle looming challenges in climate, medicine and transportation. A forum addressing science and technological innovations and the future of
Representatives from nearly 200 countries and regions have gathered in Durban,South Africa,for the 17th session of the Conference of the Parties to the United Nations Framework Convention on Climate Change (UNFCCC) an...Representatives from nearly 200 countries and regions have gathered in Durban,South Africa,for the 17th session of the Conference of the Parties to the United Nations Framework Convention on Climate Change (UNFCCC) and the 7th session of the Meeting of the Parties to the Kyoto Protocol.The meeting is the follow-up conference to展开更多
Despite fast development, many residents in Chinese cities struggle to find a decent life When talking about poverty in China, people tend to conjure up images of farmers struggling in remote mountain villages or in t...Despite fast development, many residents in Chinese cities struggle to find a decent life When talking about poverty in China, people tend to conjure up images of farmers struggling in remote mountain villages or in the arid lands of the far west. Yet behind their gleaming skyscrapers展开更多
China is fighting the worst floods in summer and has an extremely wet fall and a cold winter ahead China has been suffering from a string of rain-triggered
On 18 March 2020,President Moon Jae-in of South Korea said the COVID-19 outbreak is s imultaneously impacting supply and demand and causing a multi-crisis for the real economy and finance.In trying to overcome the dow...On 18 March 2020,President Moon Jae-in of South Korea said the COVID-19 outbreak is s imultaneously impacting supply and demand and causing a multi-crisis for the real economy and finance.In trying to overcome the downturn by utilizing both fiscal and monetary policies,the government of South Korea has so far introduced a total of KRW141 trillion(USD115 billion,7.4%of GDP)support measures to mitigate the impact of the COVID-19 including liquidity provisions and credit guarantees.展开更多
SCHOOL REFORM IN ENGLANDAND THE"THIRD WAY"The New Labour Government has expressed acommitment to a programme of social reform aspart of its drive to tackle the combination of
According to the reliable data of sixteen CNC lathes, each reliable index of the serial CNC lathes is evaluated before tackling and after tackling. According to the failure analysis, reliable improvement measures of t...According to the reliable data of sixteen CNC lathes, each reliable index of the serial CNC lathes is evaluated before tackling and after tackling. According to the failure analysis, reliable improvement measures of the serial CNC lathes are put forward.展开更多
Optimization problems are often highly constrained and evolutionary algorithms（EAs）are effective methods to tackle this kind of problems. To further improve search efficiency and convergence rate of EAs, this paper ...Optimization problems are often highly constrained and evolutionary algorithms（EAs）are effective methods to tackle this kind of problems. To further improve search efficiency and convergence rate of EAs, this paper presents an adaptive double chain quantum genetic algorithm（ADCQGA） for solving constrained optimization problems. ADCQGA makes use of doubleindividuals to represent solutions that are classified as feasible and infeasible solutions. Fitness（or evaluation） functions are defined for both types of solutions. Based on the fitness function, three types of step evolution（SE） are defined and utilized for judging evolutionary individuals. An adaptive rotation is proposed and used to facilitate updating individuals in different solutions.To further improve the search capability and convergence rate, ADCQGA utilizes an adaptive evolution process（AEP）, adaptive mutation and replacement techniques. ADCQGA was first tested on a widely used benchmark function to illustrate the relationship between initial parameter values and the convergence rate/search capability. Then the proposed ADCQGA is successfully applied to solve other twelve benchmark functions and five well-known constrained engineering design problems. Multi-aircraft cooperative target allocation problem is a typical constrained optimization problem and requires efficient methods to tackle. Finally, ADCQGA is successfully applied to solving the target allocation problem.展开更多
The endangerment of aeolian sand is one of the most serious eco-environmental problems facing the southern suburb of Beijing. To control wind erosion is thus a matter of great urgency. This paper chooses typical land-...The endangerment of aeolian sand is one of the most serious eco-environmental problems facing the southern suburb of Beijing. To control wind erosion is thus a matter of great urgency. This paper chooses typical land-use types, i.e., cultivated land, wild grassland, drifting sandy land, etc. based on the fixed experimental observation and quantitative analysis, to conduct studies on the principles and characteristics of aeolian activities and measures controlling wind erosion in Daxing District of Beijing, The results show that： the near ground wind velocity yielded the logarithmic distribution with height; there are significant differences among different ground cover roughness; there are significant differences in the corresponding friction velocities caused by different properties of the underlying surface; there are differences in the threshold wind velocities speed in different land .use types; and there are minus exponential relations between the sediment discharge percentage and the height at a range of 0-20 cm air flow layer, Different land use types result in various degrees of coarse component. There is a significant exponential relation between sediment transport concentration and wind velocity.展开更多
文摘There is chaos in the Gulf region. Saudi Arabia in conjunction with the United Arab Emirates, Bahrain, Egypt and other gulf countries,suddenly cut off diplomatic relations with Qatar expelling diplomats and citizens, exerting blockades on land, sea and aviation on June 5, 2017, with the excuse that Qatar supports terrorism- and damages regional security. Sandi Arabia and other gulf countries have issued an ultimatum on June 23, giving Qatar to 10 days to meet their 13 requirements. For a time, the Saudi-led group became the media hot word. The Gulf, once a rare peaceful land under the impact of the Arab Spring, now falls into chaos. The GCC in fact has split. This is another major diplomatic adventure that Saudi Arabia has taken in recent years.
文摘The poor households with profiles and cards are the important objects of the targeted poverty alleviation. The supporting work of the students with profiles and cards in colleges and universities is an important part of the poverty alleviation in education. The university support should not only maintain in the economic and material support, but should also pay more attention to each student as the pillar of the socialist modernization in China, to fundamentally block the intergenerational transmission of the students with profiles and cards and their families. In fact, the path is to build up the supporting concept of the growth and development based on the students with cards and profiles, build a three-dimensional identification path, and establish and improve the tracking and evaluation mechanisms for the targeted funding.
文摘Although global governance was not a widely recognizable concept until the end of the Cold War,its practice can be traced back to the history of international relations as some of the countries had the experience in solving common problems through transnational coordination.At present,"profound changes unseen for a century"call for more effective common solution on the global plane.
文摘The paper summarizes the development of mobile communication of domestic and foreign railways,and proposes the priorities for tackling key technological problems of railway 5G private network according to the technical routes of railway next-generation mobile communication determined by China State Railway Group Co.,Ltd.From the aspects of work objectives,principles,technical routes and innovative working methods,the paper elaborates the ideas of railway 5G scientific and technological research,puts forward the contents and plans of scientific and technological research on railway 5G private network,systematically organizes the achievements in the scientific and technological research stage of railway 5G private network,and sets forth the key contents of next-step scientific and technological research.
文摘CHINA has lifted nearly 700 million people out of poverty in the past three decades and plans to eradicate domestic poverty by 2020. During this period, it has also been assisting African countries and other developing nations to escape from the ravages of poverty. Zuo Changsheng, Director of the Inter- national Poverty Reduction Center in China （IPRCC）.
文摘WHEN a Kenyan mother named her daughter Cotecxin, the story behind the name became something of a rural legend. In 1996. a pregnant woman from a village near Kisumu, the capital city of Nyanza Province in west Kenya, caught malignant malaria. If she took quinine, a Western medicine used to cure the disease, she would likely survive, but would either miscarry her pregnancy or have a baby with significant birth defects.
文摘The Tibetan Plateau represents a unique landform with an average elevation that is higher than 4,000 m above sea level. Also known as the roof of the world and the Asian Water Tower, this topography preserves the largest ice mass as the solid water outside the Arctic and Antarctica. The Tibetan Plateau is a natural laboratory for research on multi-sphere interactions and for the study of humannature relationship. China conducted the first large and longstanding scientific expedition to this area between the 1970s and the 1990s and achieved fruitful scientific results.
文摘This article discusses the market potential estimation results at different stages of second-generation oxy-fuel technology for carbon capture and storage,where oxygen content is increased in order to increase efficiency and product life cycle.The article highlights the challenges to commercializing an energy technology with long development lead times.Challenges related to external market environment,regulations and market price for carbon dioxide(CO_(2))also need to be resolved.The study is based on a second-generation oxy-CFB technology evaluation,SWOT analysis and product life-cycle estimation.The commercialization of second-generation oxy-fuel technology,estimated as a basis of oxy-CFB technology,is largely found to be dependent on technical,sociological and economical aspects related to the energy market environment.The CO_(2) price in European Union(EU)emissions trading is currently below 10€/ton,which does not favour investment in CCS.CO_(2) storage also faces public opposition and EU directive limitations.The CO_(2) price needs to be in the range of 30€/ton by 2030,the estimated time of commercialization.Technological development or subsidies would also be required for the second-generation oxy-CFB power production concept to become viable.This is one of the critical factors in market deployment as the price development is influenced by several external factors,including the EU’s environmental policy,politics and public acceptance.
文摘The sub-forum on standardization of new energy and direct-current diversified applications was held on July 9,which gathered leaders and experts to discuss how to thoroughly implement the national green power direct connection policy proposed in the transformation of the energy landscape,pool wisdom to tackle bottlenecks in the industrialization of DC technology,and leverage the role of standardization in coordinating and regulating the diversified applications of DC technology.It was designed to promote the establishment of a collaborative,open,and advanced global standards system for DC technology.
文摘The world will continue to rely on scientists and technicians to tackle looming challenges in climate, medicine and transportation. A forum addressing science and technological innovations and the future of
文摘Representatives from nearly 200 countries and regions have gathered in Durban,South Africa,for the 17th session of the Conference of the Parties to the United Nations Framework Convention on Climate Change (UNFCCC) and the 7th session of the Meeting of the Parties to the Kyoto Protocol.The meeting is the follow-up conference to
文摘Despite fast development, many residents in Chinese cities struggle to find a decent life When talking about poverty in China, people tend to conjure up images of farmers struggling in remote mountain villages or in the arid lands of the far west. Yet behind their gleaming skyscrapers
文摘China is fighting the worst floods in summer and has an extremely wet fall and a cold winter ahead China has been suffering from a string of rain-triggered
文摘On 18 March 2020,President Moon Jae-in of South Korea said the COVID-19 outbreak is s imultaneously impacting supply and demand and causing a multi-crisis for the real economy and finance.In trying to overcome the downturn by utilizing both fiscal and monetary policies,the government of South Korea has so far introduced a total of KRW141 trillion(USD115 billion,7.4%of GDP)support measures to mitigate the impact of the COVID-19 including liquidity provisions and credit guarantees.
文摘SCHOOL REFORM IN ENGLANDAND THE"THIRD WAY"The New Labour Government has expressed acommitment to a programme of social reform aspart of its drive to tackle the combination of
文摘According to the reliable data of sixteen CNC lathes, each reliable index of the serial CNC lathes is evaluated before tackling and after tackling. According to the failure analysis, reliable improvement measures of the serial CNC lathes are put forward.
基金supported by the National Natural Science Foundation of China(No.61004089)supported by China Scholarship Council
文摘Optimization problems are often highly constrained and evolutionary algorithms（EAs）are effective methods to tackle this kind of problems. To further improve search efficiency and convergence rate of EAs, this paper presents an adaptive double chain quantum genetic algorithm（ADCQGA） for solving constrained optimization problems. ADCQGA makes use of doubleindividuals to represent solutions that are classified as feasible and infeasible solutions. Fitness（or evaluation） functions are defined for both types of solutions. Based on the fitness function, three types of step evolution（SE） are defined and utilized for judging evolutionary individuals. An adaptive rotation is proposed and used to facilitate updating individuals in different solutions.To further improve the search capability and convergence rate, ADCQGA utilizes an adaptive evolution process（AEP）, adaptive mutation and replacement techniques. ADCQGA was first tested on a widely used benchmark function to illustrate the relationship between initial parameter values and the convergence rate/search capability. Then the proposed ADCQGA is successfully applied to solve other twelve benchmark functions and five well-known constrained engineering design problems. Multi-aircraft cooperative target allocation problem is a typical constrained optimization problem and requires efficient methods to tackle. Finally, ADCQGA is successfully applied to solving the target allocation problem.
基金The national "Tenth-Five Year Plan" Key Program of Science and Technology, No.2002BA517A14 Beijing Sand Desertification and Wind Sand Countermeasure Demonstration Area Project, No.H020720110330 Key Project of Natural Science Foundation of Beijing, No.8011003
文摘The endangerment of aeolian sand is one of the most serious eco-environmental problems facing the southern suburb of Beijing. To control wind erosion is thus a matter of great urgency. This paper chooses typical land-use types, i.e., cultivated land, wild grassland, drifting sandy land, etc. based on the fixed experimental observation and quantitative analysis, to conduct studies on the principles and characteristics of aeolian activities and measures controlling wind erosion in Daxing District of Beijing, The results show that： the near ground wind velocity yielded the logarithmic distribution with height; there are significant differences among different ground cover roughness; there are significant differences in the corresponding friction velocities caused by different properties of the underlying surface; there are differences in the threshold wind velocities speed in different land .use types; and there are minus exponential relations between the sediment discharge percentage and the height at a range of 0-20 cm air flow layer, Different land use types result in various degrees of coarse component. There is a significant exponential relation between sediment transport concentration and wind velocity.
