首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 15 毫秒
1.
The impact of the Tibetan Plateau uplit on the Asian monsoons and inland arid climates is an important but also controversial question in studies of paleoenvironmental change during the Cenozoic. In order to achieve a good understanding of the background for the formation of the Asian monsoons and arid environments, it is necessary to know the characteristics of the distribution of monsoon regions and arid zones in Asia before the plateau uplit. In this study, we discuss in detail the paterns of distribution of the Asian monsoon and arid regions before the plateau uplit on the basis of modeling results without topography from a global coupled atmosphere–ocean general circulation model, compare our results with previous simulation studies and available biogeological data, and review the uncertainties in the current knowledge. Based on what we know at the moment, tropical monsoon climates existed south of 20?N in South and Southeast Asia before the plateau uplit, while the East Asian monsoon was entirely absent in the extratropics. hese tropical monsoons mainly resulted from the seasonal shits of the Inter-Tropical Convergence Zone. here may have been a quasi-monsoon region in central-southern Siberia. Most of the arid regions in the Asian continent were limited to the latitudes of 20–40?N, corresponding to the range of the subtropical high pressure year-around. In the meantime, the present-day arid regions located in the relatively high latitudes in Central Asia were most likely absent before the plateau uplit. he main results from the above modeling analyses are qualitatively consistent with the available biogeological data. hese results highlight the importance of the uplit of the Tibetan Plateau in the Cenozoic evolution of the Asian climate patern of dry–wet conditions. Future studies should be focused on efects of the changes in land–sea distribution and atmospheric CO2 concentrations before and ater the plateau uplit, and also on cross-comparisons between numerical simulations and geological evidence, so that a comprehensive understanding of the evolution of the Cenozoic paleoenvironments in Asia can be achieved.  相似文献   

2.
The global environmental issue, pollution and its impact on the ecological setting have become the focus of the public concern in today‘s world. In light of the booming development of our country‘s national economy in the coming five to 10 years, our task is exceedingly tremendous to realize the sustainability in our socio-economic development through preserving the environmental resources and strengthening of environment monitoring. Because of the limitation of traditional monitoring methods, the developments of reliable, cost-effective monitoring methods with enhanced capabilities are desirable.  相似文献   

3.
<正>The earth is the shared home for all kinds of life forms and it is our legacy and our responsibility to conserve it. Through years of efforts, CAS scientists together with collaborators outside the Academy thoroughly investigated the biodiversity in China and completed the world's largest flora, the Flora of China.  相似文献   

4.
<正>The 17th General Assembly of the Members of the Chinese Academy of Sciences was convened from June 9 to13,2014 in Beijing.572 Members and 16 Foreign Members of CAS participated in the conference.On June 9,Chinese President XI Jinping addressed the assembly’s opening at the Great Hall of the People and urged independent innovation in science and technology in China."We should follow the strategy of innovation as an impetus for development.Independent innovation should be the essence of this strategy,and the most urgent thing to do is to eliminate the system and mechanism obstacles to free up the huge potentials of science and technology as the primary force of productivity,"he said."We shall not dress up our tomorrow in other peoples’  相似文献   

5.
＂It is a very wonderful story to tell,＂ in the interview with BCAS reporter SONG Jianlan before the opening of the 35 th International Symposium on Remote Sensing of Environment （ISRSE）, Dr. Ghassem R. Asrar, Director of the World Climate Research Program （WCRP） and former Earth Science Associate Administrator of the National Aeronautics and Space Administration （NASA） could not help expressing his joyfulness and satisfaction at the wonderful job the global community has done in just thirty years： building the Earth observing system （EOS）,turning the observations into useful information and making it available to scientists and decision makers around the world. Let＇s follow him to celebrate the contributions of Earth observations to our understanding of the Earth system and climate, a sub-system of our planet, and recognize China＇s current and future role in this system. Meanwhile we will have an opportunity to learn about his experiences of EOS and expectation of China＇s bigger participation in internationally cooperative projects in the field of space-based remote sensing, for future decades.  相似文献   

6.
Technology advancement that can provide new solutions and enable augmented capabilities to complementary metal–oxide–semiconductor(CMOS)-based technology,such as active and adaptive interaction between machine and human/ambient,is highly desired.Piezotronic nanodevices and integrated systems exhibit potential in achieving these application goals.Utilizing the gating efect of piezopotential over carrier behaviors in piezoelectric semiconductor materials under externally applied deformation,the piezoelectric and semiconducting properties together with optoelectronic excitation processes can be coupled in these materials for the investigation of novel fundamental physics and the implementation of unprecedented applications.Piezopotential is created by the strain-induced ionic polarization in the piezoelectric semiconducting crystal.Piezotronics deal with the devices fabricated using the piezopotential as a‘gate’voltage to tune/control charge-carrier transport across the metal–semiconductor contact or the p–n junction.Piezo-phototronics is to use the piezopotential for controlling the carrier generation,transport,separation and/or recombination for improving the performance of optoelectronic devices.his review intends to provide an overview of the rapid progress in the emerging ields of piezotronics and piezo-phototronics.he concepts and results presented in this review show promises for implementing novel nano-electromechanical devices and integrating with micro/nano-electromechanical system technology to achieve augmented functionalities to the state-of-the-art CMOS technology that may ind applications in the human–machine interfacing,active lexible/stretchable electronics,sensing,energy harvesting,biomedical diagnosis/therapy,and prosthetics.  相似文献   

7.
<正>"I participated within the CAS/MPG cooperation in the introduction of Independent Junior Research Groups at institutes of the CAS.This activity is among the most delightful and successful experiences of my scientific life.The establishment of this scientific instrument in China was determined by its scientific success in the MPG–constantly underlined by Uli Schwarz–and the groundbreaking readiness of the leadership of the CAS to pursue novel avenues of scientific organisation.  相似文献   

8.
<正>1.As a key factor of the structure formation of the universe,the existence of dark matter has been widely accepted"Dark matter"refers to a kind of matter in the universe which has gravitational effects,but has no direct interaction with light.It is deemed to be composed of completely new particles beyond the standard model of particle physics,however we know very little about the nature of dark matter.At the beginning of the 20th century,the"two clouds"in physics sky–aether and blackbody radiation–overturned the classical physics theory and gave birth to quantum mechanics and the theory of relativity.Similarly,dark matter,together with dark energy,are called the"two clouds"in the physics sky of the 21st  相似文献   

9.
Editorial   总被引：12，自引：0，他引：12  
<正>Drastic changes are taking place worldwide in productivity,growth modes,lifestyles and socioeconomic development patterns.With the strong demands of modernization and globalization,a new round of ST revolution is gaining momentum and is expected to give birth to signifi cant breakthroughs.ST innovation,the most active and revolutionary factor in today’s world,clearly characterizes our times and makes it different from any other times in the past.It has become a strategic option for various countries to cultivate new economic growth points and compete to take favorite positions for ST advancement.In the wake of the international fi nancial  相似文献   

10.
Ⅰ. Have a Clear Understanding of the Situation, Unify our Thinking and Explicitly Define the Guidelines for Running CAS in the New Era The first year of the new century witnessed a range of important events taking place in China and around the world, including China's accession to WTO, the non-official summit of APEC held in Shanghai and Beijing's successful bidding for the 2008 Olympiad.These are sufficient to testify to a global recognition of China's achievements in economic and social development. The "three-represents" theory1 was advanced as the guiding principle for the building of the Chinese Communist Party in the new century.  相似文献   

11.
The 2004 annual work con- fe re nc e of the Chine se Academy of Sciences (CAS) isheld at an important moment. It comeswhen formulation of the State Medium-and Long-term Plan for the Developmentof Science and Technology (S&T) hasbegun in an all-round way and when theseventh year has just begun for the trialimplementation of our KnowledgeInnovation Program (KIP) and we areworking hard to planthe developmentof CAS in the future. Here isthe theme of our conference: Taking …  相似文献   

12.
The development of innova-tive drugs is no doubt thetop priority in the fulfill-ment of the medical and pharmaceu-tical research task of our country.Previously, the development of drugswas mainly performed by imitation,and expense for importing drugsamounted to more than US$ 1 billionper year. After joining the WTO, wefully realize the urgency and serious-ness of the countrys situation in thedrug development.The nuclear technique is one ofthe most essential means in the R&Dof innovative dru…  相似文献   

13.
The 2004 annual work conference of the Chinese Academy of Sciences (CAS) is held at an important moment. It comes when formulation of the State Mediumand Long-term Plan for the Development of Science and Technology (S&T) has begun in an all-round way and when the seventh year has just begun for the trial implementation of our Knowledge Innovation Program (KIP) and we are working hard to plan the development of CAS in the future. Here is the theme of our conference:  相似文献   

14.
<正>We are now in an age when the development and sustainability of our society depend critically on research and innovation.At the same time,we are facing the rapid growth of digital knowledge,ubiquitous internet,and open innovation in diverse ields.Open access to scientiic knowledge can take the full advantages of the digital and internet revolution,and ensure efective implementation of strategies of innovation-driven development.As Premier Li Keqiang emphasized at the 2014 Annual Meet-  相似文献   

15.
<正>Energy is the key to our future.Whether to the production,storage or use of energy,carbon materials could provide a good solution.They are closely related to people’s daily life and regarded as one of the most promising candidates for the flexible electrodes in energy storage devices.Recently,a research team from the Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences prepared a well-defined  相似文献   

16.
正As a bar-spiral galaxy, our Milky Way (MW)is quite active chemically and dynamically.Among our MW stars, is it possible to know the evolution of each star, in order to accurately study the MW formation and evolution? Recently, chemodynamics scholars try to understand the stellar and MW evolution  相似文献   

17.
<正>The initial findings of the mission of the Dark Matter Particle Explorer (DAMPE)–nicknamed "Wukong" after the monkey king, the hero in the Chinese tale Journey to the West–have been listed sixth among China’s 2018 "Annual Top 10 Science Advances" based on their contribution to the international effort to search for dark matter and explore the high-energy window of the universe.  相似文献   

18.
<正>We have never reserved our efforts to understand the universe in which we are living.Through observing the movement of the Sun,the Moon and other celestial objects,we have mastered the laws governing the day/night alternation and seasonal changes,and applied them in agricultural production,calendar formulation,and time calibration.From the precise movement of planets,Kepler discovered the three laws of planetary motion,which later inspired Newton's law of gravity.The invention of the telescope has greatly enlarged  相似文献   

19.
Most traffic control systems available in major cities in Cameroon are still out dated, make use of theories and models which are very slow to implement, waste resources and their efficiency is very low. Thus the number of road accidents encountered on our major highways and inter urban traffic networks has been increasing despite the various efforts made by government and certain NGO to synthesize road users on certain aspects of traffic control and safety road use. Taxis are not left out in the whole show and most of the blame always falls on them. The need to use available Information and Communication Technology ICT to improve on the control of traffic in inter urban cities and major highways is imperative. ITS optimizes the use of resources, reduce pollution, contribute to environmental protection and increases the national economy. . This paper starts by giving a brief situation of the transportation system in Cameroon, its drawbacks and proposes an optimized ITS based system.  相似文献   

20.
The development of innovative drugs is no doubt the “top priority” in the fulfillment of the medical and pharmaceutical research task of our country.Previously, the development of drugs was mainly performed by imitation,and expense for importing drugs amounted to more than US$ 1 billion per year. After joining the WTO, we fully realize the urgency and seriousness of the country‘s situation in the drug development.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号