The Effect of Pion Condensation in Pion Nucleus Scattering

Based on the prediction made by many,a pion condensate shouldalready be present in ordinary finite nuclei,we have studied the effectof pion condensate in pion nucleus elastic scattering by using theGlauber multiple scattering theory.A calculation has been performedfor π-~(40)Ca elastic scattering at the incident energies of I15.5 MeVand 241 MeV,and then compared to the existing data available.Theresults strongly indicate that pion condensate completely have noadequate opportunity to manifest itself in pion nucleus scattering,atleast for small angle scattering.     

Research undertaken by CAS scientists with support of "973 Program"

The National Basic Research Program (dubbed as the " 9 73 Program" is China's on-going national keystone basic research program, which was approved by the Chinese government in June 1997 and is organized and implemented by the Ministry of Science and Technology. The strategic objectives of the Program are to strengthen the original innovations and to address the important scientific issues concerning the national economic and social development at a deeper level and in a wider scope, so as to improve China's capabilities of independent innovations and to provide scientific support for the future development of the country. The followings are some of the" 9 73 projects" initiated in 2006 under the coordination of CAS scientists.     

Revisiting non-linear Thomson scattering with metamaterialsOA

<正>Non-linear optics is a branch of optics that studies the intriguing and sometimes unexpected ways in which light and matter interact at high intensities, when the polarization density does not respond linearly to the electric field of the light. The pursuit of the perfect non-linear optical material has been ongoing ever since the pioneering experiment on second harmonic generation carried out by Franken in 1961 [1]. Indeed,     

In situ analysis of surface composition and meteorology at the Zhurong landing site on MarsOA

The Zhurong rover of the Tianwen-1 mission landed in southern Utopia Planitia,providing a unique window into the evolutionary history of the Martian lowlands.During its first 110 sols,Zhurong investigated and categorized surface targets into igneous rocks,lithified duricrusts,cemented duricrusts,soils and sands.The lithified duricrusts,analysed by using laser-induced bre akdown spectroscopy onboard Zhurong,show elevated water contents and distinct compositions from those of igneous ro cks.The ce...     

International Center for Climate Research Opens at CAS Institute

The opening ceremony of the Nansen-Zhu International Research Centre (NZC) was held on November 4 in Beijing. High-ranking officials from the Chinese and Norwegian governments and the Royal Norwegian Embassy took part in the ceremony. The formal opening was conducted by the Norwegian Minister of the Environment, Mr. Borge Brende. Congratulation letters were presented by CAS President Lu Yongxiang and by Vice Minister of Science and Technology Deng Nan.The Nansen-Zhu Centre, which     

The great catastrophe: causes of the Permo-Triassic marine mass extinctionOA

The marine losses during the Permo-Triassic mass extinction were the worst ever experienced. All groups were badly affected, especially amongst the benthos(e.g. brachiopods, corals, bryozoans, foraminifers,ostracods). Planktonic populations underwent a fundamental change with eukaryotic algae being replaced by nitrogen-fixing bacteria, green-sulphur bacteria, sulphate-reducing bacteria and prasinophytes. Detailed studies of boundary sections, especially those in South China, have resolved the cr...     

Study on quality control method for compound Shanzha Granules

Objective:To establish the quality standard of Compound Shanzha Granules.Methods:Crataegi Fructus and Cassiae Semen were identified by TLC.The contents of Autrantio-obtusin and Chrysophanol in Cassiae Semen were determined by HPLC.Results:The relevant spots on TLC plates were clear by the blank reference.The contents showed good linearitis in the range of 0.0357~0.3570μg for Autrantio-obtusin and 0.0520~0.5200μg for Chrysophanol.Conclusions:The method are simple,accurate and reproducible.     

Learning physical characteristics like animals for legged robotsOA

Physical characteristics of terrains,such as softness and friction,provide essential information for legged robots to avoid non-geometric obstacles,like mires and slippery stones,in the wild.The perception of such characteristics often relies on tactile perception and vision prediction.Although tactile perception is more accurate,it is limited to close-range us e;by contrast,establishing a supervised or self-supervised contactless prediction system using computer vision re quires adequate labele...     

Late Ordovician Mass Extinction: Earth,fire and iceOA

The Late Ordovician Mass Extinction was the earliest of the ‘big’ five extinction events and the earliest to affect the trajectory of metazoan life. Two phases have been identified near the start of the Hirnantian period and in the middle. It was a massive taxonomic extinction, a weak phylogenetic extinction and a relatively benign ecological extinction. A rapid cooling, triggering a major ice age that reduced the temperature of surface waters, prompted a drop in sea level of some 100 m and intr...     

Towards Excellence in Science

<正>May 26,2014,BeijingScience is a human enterprise in the pursuit of knowledge.The scientific revolution that occurred in the 17th Century initiated the advances of modern science.The scientifi c knowledge system created by human beings,the tremendous productivity brought about by science,and the spirit,methodologies and norms formulated in scientific practice since the 17th Century have long become essential elements of modern civilization.Today’s world is characterized by rapid knowledge expansion,an explosion of data and information and the globalization of economies.In these times,scientific excellence is an essential principle for transforming human thinking and     

MPS／CAS Partner Group on Colloid and Interface Science

The Partner Group on Colloid and Interface Science is based on the International Joint Laboratory, established in the former Beijing Institute of Photographic Chemistry, Chinese Academy of Sciences (CAS), and was incorporated into the Center for Molecular Science of the Institute of Chemistry, CAS in 1999. The Partner Group aims at research on molecular assembly of biomimetic membranes and the synthesis of nano-structured materials by way of training younger Chinese scientists and making use of the advanced facilities in Germany. Both sides cooperate closely in sectors in which they have a common interest to push forward the development of related sciences in China. The group leader, Li Junbai, has received many awards and has obtained much financial support inside China. On the German side, the Partner Group is hosting or participating in several research and development projects commissioned by the Max Planck Society and the Deutsche Forschungsgemeinschaft (DFG). The Partner Group has thus secured goo     

How variable progenitor clones construct a largely invariant neocortexOA

The neocortex contains a vast collection of diverse neurons organized into distinct layers. While nearly all neocortical neurons are generated by radial glial progenitors(RGPs), it remains largely unclear how a complex yet organized neocortex is constructed reliably and robustly. Here, we show that the division behavior and neuronal output of RGPs are highly constrained with patterned variabilities to support the reliable and robust construction of the mouse neocortex. The neurogenic process of ...     

Evolution of artificial ion channelsOA

<正>Protein ion channels on a cell membrane generate action potentials for cellular signal transduction, and regulate biological activities during life. Since the discovery of the asymmetric ion transport phenomenon in quartz nanopipettes by Bard and colleagues [1], synthetic nanofluidic materials and devices have attracted a lot of research interests from the scientific community,     

长时间待在教室更容易近视（英文）

正The more years you spend in full-time education, the more short-sighted you are likely to be, according to a large UK study.The link appears to be that students have too little exposure to bright natural light—and the antidote suggested by the researchers is for children to spend more of the day outdoors.The study, carried out by Cardiff and Bristol university scientists, analysed information on the genetics, eyesight and educational background of68 000 participants in the UK Biobank database.     

情报科学中的符号语言学

The paper argues that the theory that opens out the nature of subject indexing process is required, if the process consists of a tremor of steps and elements and it is a range of interpretations, too. The paper points out that Peirce' s semiotics is the theory by which we may study and understand the lmture of interpretation in subject indexing pro-cess. In recent years, there is a great interest in semiofcs in library and information science field. The paper discusses some basic issues of semiotics and its use in information science.     

The Lopingian Series of China and End-Permian Mass Extinction

The end-Permian mass extinction is the greatest bioevent in the geological history, which wiped out nearly 95％ of the marine species and 75％ of the terrestrial species,followed by a biological winter for more than five million years.The cause and the process of the end-Permian mass extinction remain an unsolved mystery in earth science and one of the most difficult and interesting scientific problems.     

Tandem organic solar cells with 20.6% efficiency enabled by reduced voltage lossesOA

Large voltage losses are the main obstacle for achieving high efficiency in organic solar cells(OSCs).Here we construct ternary OSCs by introducing an asymmetric small molecule acceptor AITC into PBDB-TCl:BTP-eC9 system and demonstrate the effectiveness in simultaneously decreasing energy disorder and non-radiative voltage losses.It is found that the introduction of AITC can modify domain size and increase the degree of crystallinity,which enhances open-circuit voltage and power conversion effic...     

On the First Case of Pre-action Injunction Granted in Beijing: Red Lion Paint Co., Ltd. v. Red Lion Jing Paint Trading Co., Ltd.

The case in brief The Beijing Red Lion Paint Co., Ltd. (the RL for short) is a business that manufactures and markets paint, and the proprietor of several registered trademarks of the “RED LION“ words, device and the combination thereof. The registered “RED LION“ trademark has been, on several occasions, rewarded by the relevant departments the title of Famous Trademark in Beijing.     

Project on Biomass Gasification and Power Generation Wins BlueSky Award

After a strict scrutiny by an international jury, a . system for biomass gasification and power generation developed by the CAS Guanzhou Institute of Energy Conversion (IEC) has been chosen as one of the eight winners of the BlueSky Award in 2005. The event was jointly sponsored by the United Nations Industrial Development Organization and the International Technology Promotion Center for Sustainable Development in Shenzhen, in south China's Guangdong Province.