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 31 毫秒
1.
正Professor Shuhrat Ehgamberdiev is currently Director of the Ulugh Beg Astronomical Institute(UBAI)of the Uzbekistan Academy of Sciences.Thanks to his organizational and scientific skills,Maidanak Astronomical Observatory(MAO),which is a part of UBAI,has become one of the key observatories in a number of international projects requiring continuous monitoring of unique astrophysical objects.In particular,he has been playing an active role  相似文献   

2.
Prof. SUN Song, a marine ecologist, has been appointed the new director of the CAS Institute of Oceanology (IOCAS) in Qingdao, a coastal city in east China's Shandong Province. He will replace Prof. XIANG Jianhai, who is retiring,  相似文献   

3.
Teaming up with colleagues from Europe, Japan, and US, Dr. DENG Jinsong from the National Astronomical Ob- servatories at CAS (NAOC) has made fresh progress in revealing the mechanism behind the origin of the long-duration gamma-ray bursts (GRBs), which a…  相似文献   

4.
Let [m/n]_f be the matrix Padé approximant (MPA, left-or righthanded) for a given matrix-valued power series f. Let T_(m,n)~n, be the operator which maps f to [m/n]_f. It is well known that in the scalar. case T_(m,n)~n satisfies a (local) Lipschitz condition if and only if [m/n]_f has a zero defect. However, in the matrix case we are confronted with the difficulty that we cannot give a definition of defect.In this paper, an explicit expression of MPA is given and a result about the continuity of the matrix Padé operator is obtained.  相似文献   

5.
The purpose of this paper is to discuss the influence of sampling rate on closed system which has been discretized from continuous system and in which the ZOH is not inserted, As an example, in has been discribed for the second order system that the impoper choice of sampling rate may cause the unstability of a discretized system, though its original continuous system is stable. The change of locations of poles due to the variations of sampling rate are shown in plots. Proper sampling rate is suggested. Different methods of discretization are compared, and the bilinear transform is recommended.  相似文献   

6.
The project is a fundamental research in the field of several complex variables, which is one of the core and forefront subjects in pure mathematics. It is carried out by Prof. Zhou Xiangyu (Xiang-Yu Zhou), a mathemati- cian who has long been working on this profound and popular subject. Despite the intensive competition from other outstanding mathematicians, he found his own way and achieved a series of important results which are well recognized by the mathematical community. As a long-sta…  相似文献   

7.
正A recent study conducted by researchers from the National Astronomical Observatories of the Chinese Academy of Sciences(NAOC)has shed new lights on the mass density of the dark matter in the local volume around the Sun.With carefully selected LAMOST data and a simple analytical Kz force model,they concluded that the volume density of the dark matter around us is 0.018±0.005M.pc~(-3),higher than the results of  相似文献   

8.
The CAS Institute of Botany(IBCAS) has a history morethan 70 years. During thecurrent drive of Chinas economicand scientific reforms, the IBCAS,in the context of the world S&T de-velopment trend and in line with itsown superiorities, is active in carry-ing out international cooperation andexchanges.I. Plant Systematics andEvolutionSince its founding in 1987, theKey Laboratory of Systematic andEvolutionary Botany, IBCAS, haswatched closely the development ofthese two research fields…  相似文献   

9.
The National Astronomical Observatories(NAOC) was officially founded in 2001 through the merger of five astronomy-oriented organizations of the Chinese Academy of Sciences(CAS).Headquartered in Beijing,NAOC has four subordinate units across the country:Yunnan Astronomical Observatory(YNAO),Nanjing Institute of Astronomical Optics and Technology(NIAOT),Xinjiang Astronomical  相似文献   

10.
After three-and-half-year efforts, the National Astronomical Observatories at CAS (NAOC) has constructed two arrays of radio antennae: a 50m antenna at Miyun Station in Beijing and a 40m antenna in Kunming, capital of southwest China's Yunnan Province.  相似文献   

11.
Vegetation could be recovered in enclosed districts where soil erosion is controlled by integrated measures such as turning hillsides into terraces.The fragile eco-environment inthe west of China has be-come a bottleneck in theregions development. When puttingthe national strategy of developingthe western region into practice, thecentral authorities list the rehabilita-tion of the depleted eco-environmentas one of the key infrastructure pro-grams for the whole country, urgingpeople to return f…  相似文献   

12.
正In the main Proboscidean taxon of Elephantiformes,a huge pair of developed top incisors(ivories) has become a distinctive feature.The structure is usually made as a tool for individual foraging and a weapon for males to compete for mating.The Proboscidean taxon without ivories usually and only exists in the primitive taxon that were differentiated before Oligocene,for instance,Deinotherium merely developed a pair of  相似文献   

13.
According to Article 31 of the Trademark Law as re- vised in 2001,In trademark application,one should not pre- emptively register a mark that is already in use by another party and has certain influence;it is also provided in Article 41,paragraph two that where a registered trademark stands in violation of the preceding provision,the owner of the mark  相似文献   

14.
in Internet relay chat too. Introduction Although a number of linguists such as Baron (2000), Crystal (2001) and Hillier (2004) have begun to explore and describe some of the changes in function and form of written language as a consequence of technological developments and the rise of the internet, computer mediated communication is still relatively less explored. As for the pragmatic interpretation of Internet chat, much less work has been done. This paper is a study of conversational patt…  相似文献   

15.
The CAS Shenzhen Institute of Advanced Tech- nology (SIAT) is jointly founded by CAS and the gov- ernment of Shenzhen, China’s first special economic region. It is the first R&D entity in China specializing in modernized manufacturing and independent innovation with integrated technologies as its disciplinary orientation. Why SIAT? Involving a number of fields of sci- ence and engineering, the integrated technology has gained a rapid development and is recognized for a variety of app…  相似文献   

16.
An international consor- tium of astronomers, in cluding a CAS astrophysicist, has revealed how galaxies looked like in early daysof the Universe. They discovered that massive galaxies already ex- isted when the Universe is one fifth of its current age, p…  相似文献   

17.
<正>"The MPG-CAS Partner Group led by Prof.HAN Jinlin from the Nationa Astronomical Observatories of China(CAS)has achieved great success in the determination of the magnetic fields o the Milky Way.The basis of this success was a cryogenic receiver with a polarim eter that was installed in China at the25m Nanshan Radio Telescope of the Urumqi Observatory.The receiver was a copy of a system installed in the 100m Effelsberg radio telescope of the Max Planck Institute for Radio Astronomy in Bonn,Germany.A very lively exchange of researchers at all levels took place.On  相似文献   

18.
正Big Bang Nucleosynthesis(BBN)has produced three light elements:hydrogen,nitrogen and lithium.Measuring the abundances of these elements is the most reliable way to explore the physical condition in the first few seconds after the BBN.Recently,using LAMOST data and follow-up observations,the stellar abundance group at the National Astronomical Observatories of the Chinese Academy  相似文献   

19.
It is a relatively common phenomenon to limit technical features with parameter range in patent claims. It is argued in this article that the parameter range should be distinctly divided into single parameter range and whole parameter range depending on the different mode and function of limitation. Each and every parameter in a single parameter range may independently achieve a technical effect, and limit one embodiment alone; while a single parameter in the whole parameter range cannot independently achieve any technical effect, and the set of parameters as a whole within the parameter range limit a technical feature. Discrimination between the single parameter range and the whole parameter range has a bearing on the assessment of novelty and inventiveness. Owing to the absence of such discrimination of parameter range, the provisions of the current Guidelines for Examination on novelty and inventiveness of the claims relating to parameter range are not applicable to the circumstance of whole parameter range.  相似文献   

20.
A research team led by Prof.JING Yipeng from the CAS Shanghai Astronomical Observatory (SHAO) recently got a shot in the arm. Its research project"large-scale structures in the universe and the formation and evolution of galaxies," has won the support from the National Basic Research Program(dubbed "973" Program).  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