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.
Though female physicists and chemists were rare in the lab generations ago, more and more women in China have been diving into fields of scientific study used to be dominated by men. To show how they have progressed in recent years, our staff reporter XIN Ling, shares with you the success stories of three leading female scientists from the Chinese Academy of Sciences.  相似文献   

2.
One of the major achievements in the study of deep geodynamics over the past two decades is the finding that the subcontinental lithosphere isnot immutable. The instability of the lithosphere may be closely related to the tremendous change in its structure, composition and rheology. The trigger and mechanism of lithospheric destabilization are the key to understanding the generation of intraplate magmatism, ore-forming processes and tectonic evolution. Therefore, along with the development of the research in this direction, the plate tectonic theory can be improved to more successfully cover the tectonics of continental plate.  相似文献   

3.
Although the formation process of low-mass stars like our Sun has been well understood, the birth of high-mass stars with more than eight solar masses still remains a mystery. A recent study by CAS astronomers and their collaborators from Japan and UK offered direct observational evidence for demystifying the puzzle. The work was published in the Sept. 1 issue of Nature.  相似文献   

4.
The objective of this paper is to help the students become good writers by guiding them through the process of writing, such as generating ideas, drafting, and revising. The ability to write well will help students provide answers in examinations and write project reports and academic essays which will be understood easily and appreciated by the teachers. Writing well is also an asset at the work place, where you may be writing memos, e-mail messages, reports, or proposals to various types of readers. Therefore, it is crucial for the students to be coached in the use of the writing process. In this paper, we will analyze the complete writing process by dividing it into three stages: planning, writing, and finalizing. Within each of these stages, there are a few steps.  相似文献   

5.
People are always fascinated by ways that some members of mammalian species (such as dolphins, bats and some rodents) communicate using sounds that we cannot hear. But think twice if you say the capacity of producing and detecting ultrasounds (frequencies greater than 20kHz) is limited to mammalians. A study implemented by Prof. SHEN Junxian from the CAS Institute of Biophysics (IBP) and colleagues in CAS and abroad showed that a rare frog species in China should also be added to that list. It is the first documented case of a non-mammalian species being able to use ultrasonic communication. Their work was reported in the March 16 issue of the journal Nature.  相似文献   

6.
The intercrossing of disciphnes is an important impetus of scientific development. The existing automatic information retrieval systems are not propitious for the generation of new ideas and the interdisciplinary multiplication as they are developing towards more intelligent, knowledgeable and specialized ones. The scientific development calls for a new automatic information retrieval tool. The research will be a comprehensive subject involved with many disciplines and rields, and need to be conducted in order and step by step.  相似文献   

7.
<正>The biological makeup of humans in East Asia is shaping up to be a very complex story,with greater diversity and more distant contacts than previously known,according to a new study[1]in Current Biology analyzing the genome of a man that died in the Tianyuan Cave near Beijing,China 40,000 years ago.His bones had enough DNA molecules left,making it possible for a team led by Professor FU Qiaomei  相似文献   

8.
Although the formationprocess of low-massstars like our Sun hasbeen well understood, the birth ofhigh-mass stars with more thaneight solar masses still remains amystery. A recent study by CASastronomers and their collaboratorsfrom Japan and UK offered directobservat ional evidence f ordemystifying the puzzle. The workwas published in the Sept. 1 issueof Nature.Currently there are two majorrival hypotheses for the massivestar formation. In one scenario, theprocess occurs when several low-ma…  相似文献   

9.
A panel of experts recently gave the nod to a proposal and feasibility study to set up a research station for monitoring the dry-hot valley ecosystem in Yuanjiang of southwest China's Yunnan Province.The proposal was presented by the CAS Xishuangbannan Tropical Botanical Garden. Covering about one hectare,the station will be located in Pu Piao,  相似文献   

10.
As a research professor at the Guangzhou Institutes of Biomedicine and Health (GIBH), Chinese Academy of Sciences, Miguel Esteban is the first non-Chinese scientist to chair a major scientific research program in China. Born and educated in Spain and the UK, he worked in Madrid and London as a scholar and physician before joining GIBH in January 2008. Just two years after his arrival, in 2010, Professor Esteban was named by the Chinese Ministry of Science and Technology as the chief scientist of a five-year major research program on stem cell study with a grant up to 28 million yuan (about 4.4 million US dollars). The following is a brief interview between BCAS reporter XIN Ling and the Professor about his work and life in China.  相似文献   

11.
<正>In this era of colossal data,more than 2 quintillion bytes of data were created every day.The huge amount of data brings us not only unprecedented convenience and opportunities but also incomparably severe challenges in data processing at the same time.The processing performance of computers is known to be determined almost entirely by the logic  相似文献   

12.
The classic hare-lynx cycle has been cited as a prime example of how interactions between predators and preys might lead to regular population variation.However, a recent study by CAS zoologists shows that it might not be the case. Their work published in the July issue of the Germany-based Climate Research.  相似文献   

13.
<正>Plants, though passive and still as it appears, are considered to be quite active to engage with other living things, particularly in the root part that faces relatively more complicated surroundings. In a recent report in Science, researchers from the Institute of Genetics and Developmental Biology, Chinese Academy of Sciences and their cooperators from the John Innes Center, UK unraveled new evidence that plants can  相似文献   

14.
At long last,after two decades of endeavor,China’s first high energy astrophysics research probe is about to take of f.The 2.5-ton Hard X-ray Modulation Telescope(HXMT),which is set to be sent 550 km above the ground early2017,will be carrying a trio set of detectors to gather X-rays emitted by black holes and neutron stars in the 1-250ke V band,and enable Chinese scientists to explore the distribution and property of these mysterious sources–with their own data,for the first time in history,in the next four years or more.In August,BCAS reporter XIN Ling had the privilege to meet astrophysicist ZHANG Shuangnan of the Institute of High Energy Physics(IHEP),Chinese Academy of Sciences who is now principal investigator of the HXMT project.During the interview,ZHANG talked about the telescope’s research missions,potential challenges in orbit,as well as its history and lessons to be learned in developing one of the nation’s first science satellites.  相似文献   

15.
The Talbot effect, the self-im-aging of a grating when it isilluminated by a monochro-matic plane wave, was first discov-ered by the English scientist HenryFox Talbot more than a century ago.It is generally described in universitytextbooks as an example of Fresneldiffraction and is considered one ofthe fundamental phenomena inoptics.The phenomenon has re-ceived continuous attention sinceit was first described, not only be-cause understanding it is so fun-damental to the study of optics,but …  相似文献   

16.
The temperature of the upper reaches of theYellow River, the second longest river in China,is clearly related to the worldwide warmingtrend, according to a study conducted by CAS research-ers and their colleagues from Administration of Hy-drology and Water Resources of the Upper Reaches ofthe Yellow River. They warn that, due to the possibletemperature hike and drastic decline in localprecipitation, the runoff in the reaches may face a trendof continued decrease over the next decade.The p…  相似文献   

17.
  A karyotypical analysis of Anemarrhena asphodeloides Bung. of the monotypic genus Anemarrhena Bung. (Liliaceae) was carried out for the first time. The number of chromo- somes in root-tip cell of the species was found to be 22, agreeing with that reported by Sato[12], although inconsistent in some other respects, such as position of  centromeres, length of chromosomes, and nucleoli, etc. (Table 1 ). According to the terminology defined by Levan et al.［8］, the karyotype formula is therefore 2n=22=2sm (SAT)+2sm+18m. Photomicrographs of the chromosome complements and idiogram of the karyotype are given   Fig. 1 and 2).       The karyotype of Anemarrhena asphodeloides shows explicitly to be asymmetrical, with three pairs of long chromosomes and eight pairs of short chromosomes. This specialized feature, when considered together with the rare occurrence of the basic chromosome number of 11 of the genus within the Tribe Asphodeleae of Liliaceae (see Table 1), suggests that the genus Anemarrhena is probably a rather specialized one, which has scarcely any intimate relationship with the other genera of the above tribe. The fact that this specialized karyotype is associated with certain trends of morphological specialization, such as flowers possessing three stamens only, gives support to the above suggestion. But, it is impossible to draw a more precise conclusion without a more thorough and comprehensive investigation of the species in question.  相似文献   

18.
The cooperation between Zhao Jingtai and the Max Planck Institute for Chemical Physics of Solids was initiated immediately after the research field Inorganic Chemistry (headed by Rudiger Kniep) started its work in Dresden. The first contact was established when Zhao Jingtai came from the Xiamen University as a Max Planck fellow. At that time, the chemistry of the intermetallic compounds of rare-earth metals was chosen as a topic of joint investigations with Yuri Grin. Later, the solid state chemistry of the borophosphates was added to the program of concerted research in the group of Zhao Jingtai and the Max Planck Institute for Chemical Physics of Solids. The cooperation was intensified after the move of Zhao Jingtai to the Shanghai Institute of Ceramics and the establishment of an Inorganic Materials Chemistry and Physics Group there. The results of the investigations performed from 1999 to 2003 were published in more than 25 scientific papers and more than ten contributions to scientific conferences.  相似文献   

19.
马尾树科的形态及分类系统位置的讨论   总被引：1，自引：0，他引：1  
 The present paper is devoted to a study of the basic morphological and anatomical characteristics of the endemic family Rhoipteleaceae from China.  The fundamental pattern of the morphological and anatomical characteristics of the Rhoipteleaceae is similar to those of the Juglandaceae in wood anatomy, resinous peltate scales, apetaly, bicarpellate pistils, one-seeded fruits and exalbuminous seeds.  Whereas Rhoipteleaceae has stipules; perfect flowers with superior 2-loculed ovaries, anatropous ovules and two integuments; vessel elements of the secondary xylem with the scalariform perforation, and 2–8 (18) pores on the oblique plate being observable; vascular rays heterocellular and tricolporate pollen.  The above characteristics–at least most of them, agree pretty well with those depicted by Manning in his “Pre-Juglandaceae”.  It is quite possible that the Juglandaceae is derived from  “Pre-Juglandaceae”by  way  of the Rhoipteleaceae, as the morphological and anatomical features as indicated above tend to show that the Rhoipteleaceae is more primitive than Juglandaceae.      The Rhoipteleaceae was previously considered  as related  to  the Betulaceae or Ulmaceae, a view, which the present study does not prove to be acceptable. Both Takh- tajan (1969) and Cronquist (1968) pointed out that the Juglandales, Urticales, Myrica- les, Fagales are all direct derivatives from the Hamamelidales.  However, since the Rhoipteleaceae is simillar to the Betulaceae in wood anatomy and pollen, it seems that there too could have certain relationships between the Rhoipteleaceae and the Betula-ceae in the course of evolution.  相似文献   

20.
The temperature of the upper reaches of the Yellow River, the second longest river in China,is clearly related to the worldwide warming trend, according to a study conducted by CAS researchers and their colleagues from Administration of Hydrology and Water Resources of the Upper Reaches of the Yellow River. They warn that, due to the possible temperature hike and drastic decline in local precipitation, the runoff in the reaches may face a trend of continued decrease over the next decade.  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