New Vector Particles Observed at BESⅢ

<正>The Beijing Spectrometer Experiment(BESⅢ)has announced the observation of more new charmonium-like states.The experiment measured the e+e-→π+π-J/ψand e+e-→π+π-hc cross sections with high precision,using9fb-1 data collected with the BESⅢ detector at the BEPCII accelerator,and two resonant structures were observed in each decay mode.The first structure,Y(4220),with a mass of about 4.22 GeV,was seen in     

论网络载体环境下科学信息交流过程的基本特征

The paper indicates that the scientific information communication process in the network environment has lots of new characters compared with the traditional paper-based communication process. In this paper, the author dissertates 4 of these characters, that is, shortening of the communication process; quickening of communication speed and increasing of information quantity; virtualization of information organization and weakening of the door-keeper.     

Studies on Wetland Biodiversity in China

This paper briefly summarizes the history of wetland research, the evolvement of wetland science, and their impacts on the understanding of wetland biodiversity in China. A marsh is the key type and basic component of a wetland. Defining the marsh and wetland plants is the basis for understanding the wetland and its biodiversity. The comprehensive multiple factorial classification principles and the multiple developmental models of the wetland are two innovative feats achieved by Chinese scientists, and their application has further promoted ecological research. The CAS Wetland Research Center has made historic contributions to the study of the wetland and its biodiversity in China. Also, the paper discusses several important tasks of wetland and biodiversity research.     

The Influence of Sampling Rate on the Stability and Dynamic Charaeteristecs of a Discretized System

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.     

Researchers Announce World’s First Dinosaur Preserved Sitting on Nest of Eggs that Includes Fossilized Babies

正A multinational team of researchers has announced a first for the world of paleontology:a dinosaur preserved sitting atop a nest of its own eggs that include fossilized babies inside.The scientific paper describing the discovery was recently published in the journal Science Bulletin.The primary authors are Dr.BI Shundong,professor at Indiana University of Pennsylvania and XU Xing,     

基于知识位势的战略联盟稳定性研究

本文从知识位势的角度出发,对战略联盟的稳定性进行分析。借助Logistic规律模拟联盟竞合过程,得出联盟知识共享的稳定解;运用MATLAB软件进行模拟仿真,通过系统仿真与算法推演得出联盟稳定性与联盟时间长短有密切关系。研究结果为提升战略联盟的稳定性和内部知识共享提供参考依据。

Abstract：

This paper analyzes the stability of strategic alliance from the perspective of knowledge poten- tial. Using Logistic rule to simulate the competition and cooperation process of strategic alliance,the paper obtains the stable solution for knowledge sharing in strategic alliance. The paper uses MATLAB software for simulation. Through system simulation and arithmetic deduction,the paper finds out that the stability of strategic alliance has close relationships with the length of the cooperative time of strategic alliance. The research results provide reference for promoting the stability and internal knowledge sharing of strategic alliance.     

电子商务的发展及其在国防采办中的应用

The US DoD has introduced Electronic Commerce and related technologies into their defense procurement reform. This proves to be more efficient and economic, and has laid foundation for the realization of paperless procurement. By analyzing the US DoD experiment, this paper demonstrates the feasibility of introducing Electronic Commerce technologies into China's weaponry construction step by step.     

鳞毛蕨属的生物系统学研究

At the outset the paper begins with a brief discussion of the geographical origin of the genus Dryopteris. With the cytological data so far available the author presumed that the No- rthern Hemisphere and possibly Eurasia is the geographical origin of the genus and that the Eastern Himalayas, China and Japan is the centre of speciation of the genus, and thence has spread to other continents along several routes. He is also of the opinion that the genus  tends to evolve the highest grade of polyploidy where it has existed longest. On the other hand, he pointed out that the production of polyploids may occur most frequently in response to pressures which a group meets in the course of its migration in space and time, with  the  majority  of diploids persisting as relics close to the original centre of diversification.       He then described the progress of the biosystematics of the European and North American Dryopteris, which has been undertaken through a close cooperation among botanists, cytologists and phytochemists of different nations. This team is also looking forward to a cooperation with the Chinese botanists in the study of East Asian species of Dryopteris, so that the relationships of Chinese species and those of other floras can be understood.       The term biosystematics had been invented to mean experimental studies of breeding sy- stems of the species concerned in order to ellucidate their evolutionary relationships.  It stems from the early researches of Professor Irene Manton whose classical book “Problems of Cytology and Evolution in the Pteridophyta” (1950) laid the foundation of Biosystematics. Manton was also the first to introduce the acetocarmine squash  method for staining  chromosomes  in  the spore-mother-cells at meiosis.       The lecture was illustrated with diagrams showing in detail the pairing behaviour of the chromosomes at the metaphase in meiosis and the formation of the polyploidies of different levels.       Besides cytological approach two other techniques have been also applied to the systematic studies of Dryopteris. The first is the comparison of sporoderms  using the scaning  electron microscope, revealing different ornamentations on the pericine. The second is the study of plant chemistry, in particular, that of the phloroglucinoles by thinlayer chromatography.       The remaining far greater part of the paper is devoted to analysing cytologically the Eu- ropean and North American species of Dryopteris in three groups, showing the lines of experi-mental work that has resulted in the understanding of their evolutional relationships.     

Discussion on the System of Administrative Counterpart's Right of Resistance in China

The research value of the right of resistance in the administrative law has been highlighted gradually in recent years with the enhancement of legal awareness and the increase of administrative cases in our country.In this paper,based on the concept and characteristics of the administrative counterpart’s right of resistance and the present situation of its development in our country,a conception of system of administrative counterpart’s right of resistance is proposed with the use of the regulations concerning the right of resistance in other countries for reference.     

浅议信息管理职业及专业人才培养

The arriving of information society has made information management become a specialized social occupation. Information management discipline is just the cradle to train this kind of special talent. The paper explores how to comprehend and treat information management occupation and how to position our special education and talent training in accordance with social requirement for occupation.     

企业知识管理的定位问题

The paper discusses the orientation of knowledge management in enterprises, a problem often neglected by the theoretical circles in the study of knowledge management. It points out that enterprise knowledge management is not exactly equal to knowledge management in theory, the former is only a branch of the latter. However, they are equally and alternatively used in practical applications as enterprise knowledge management is developing most rapidly and has the greatest influence. Therefore, the orientation of enterprise knowledge management is obscure.     

On The Influence of Chinese Context on English Learning

This paper sets the influence of Chinese context in English learning.As we all know,English has been one of the most widely used languaG ges in the whole world,therefore,a good mastery of English has b...     

The Study of Diversities of Marine Microbes in China

The oceans account for 71% of the Earth’s surface and are rich in the most advantageous and characteristic resources of marine microbes. The research on diversity is the key point for exploring and exploiting marine microbial resources. Giving attention to species diversity and genetic diversity of marine microbes, discovering novel metabolites with multiple functions, revealing key secondary metabolic process and the main regulation mechanisms in marine microbes, and developing a new technology of biosynthesis, are the important foundation for discovering innovative drugs and developing functional products with characteristics. The present paper has reviewed the recent advances in the four research areas of marine microbial species diversity, genetic diversity, chemical diversity and metabolic diversity in China.     

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.     

Biomedicine to Witness Leapfrog Development

<正>1.The global pharmaceutical market has entered a new round of adjustment The global pharmaceutical market keeps growing,but it faces problems like a decreasing ratio of RD investment to new drug output and the expiration of patented drugs.It is shifting to emerging countries with an increasing proportion of biotech drugs,and a new round of adjustment has been kicked off.Over the years,the pharmaceutical industry has been developing rapidly and persistently to become the fastest growing high-tech sector.However,the whole industry is facing a decreasing ratio of RD investment to new drug output.The RD spending of AstraZeneca,GlaxoSmithKline,Sanof i,Roche and Pf izer kept rising in the past 15 years but bore few fruits,and the output is signif icantly disproportional to the input.Besides,the expiration of a large number of     

Shenzhen Institute of Advanced Technology

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…     

蜘蛛抱蛋属(百合科)的细胞分类学研究(1)——四川七个种的核型

In the work mitotic chromosomes in root-tips of 7 species native to Sichuan Pro- vince were examined and their karyotypes were analysed based on 7-8 cells at mitotic meta- phase, using Levan et al.'s (1964) nomenclature. The list of species and origin of the materials used in this work are provided in the appendix.  The micrographs of mitotic metaphase of all the materials are shown in Plates 1 and 2; the idiograms in Fig. 1, 1-9, and the parameters of chromosomes are provided in Tables 1-9.  All the chromosome countings and karyotypes in this paper are reported for the first time.      Characteristics of the karyotypes may be summarized as follows:      1.  2n=38 are found in all the materials except A. sichuanensis, which has 3 cytotypes, i.e, 2n=38+5B, 2n=38+lB and 2n=38+OB (Plate 2, 1-2, Fig. 1, 5-6).      2.  The karyotypes are of two major types: the karyotype of A. flaviflora falls into 3C in Stebbins's (1958, 197l) classification of karyotypes and those of all the other species into 2C. The two types are also different from each other in the number of large and medium-sized chromosomes pairs and morphology of the first pair of chromosomes (compare Plate 2, 5, Fig. 1, 9 with the other micrographs and idiograms).A. flaviflora with the karyotype 3C also differs from the other species in a series of gross morphological characters: the species is of a yellow and campanulate corolla.      3.  The species with caespitose leaves (A. caespitosa and A. omeiensis) have essentially the same karyotype, which is rather different from those of the species with scattered leaves. There are two pairs of small sm chromosomes (arm ratio ≥1.90) in the former karyotype (Tables 1 and 3), but all the small chromosomes are m or sm with arm ratio <1.80 in the latter karyotypes.     

Higher pressure differentiation of arc magmas under thicker crust

<正>The formation of continental crust is pivotal to understanding the evolution of the earth and its habitability.The average intermediate or’andesitic’bulk composition and characteristic depletion of niobium of the continental crust are strikingly matched by convergent margin magmas [1].This has led to the inference that most continental crust is derived from igneous,arc crust.However,continental crust has characteristically higher Mg#(>0.5) than most oceanic arc andesites (<0.5).     

Neopolarographic Study On Vitamin D

Vitamin D_2 and vitamin D_3 give a clear polarographic oxidation-wave,respectively,by neopolarography,with a 0.25M solution oflithium perehlorate in ethanol-dimethylformamide(1:1)as the supportingelectrolyte.Peak potentials are both+1.27V(vs.pure Ag plate).Thewave-height is proportional to the concentration in the range from 2.6×10~(-6)M(1μg/ml)to 1.1×10~(-3)M(420μg/ml)for vitamin D_3 and from2.5×10~(-6)M(1μg/ml)to 1.1×10~(-3)M(435μg/ml)for vitamin D_2,respe-ctively.The detection limits are both 1.3×10~(-6)M(0.5μg/ml).Themethod can be satisfactorily applied to the determination of vitamin D_3in injcction.Through various experiments,it is shown that the electrodeprocess of vitamin D at glassy carbon electrode is an irreversible oxida-tion process controlled by diffusion.The value of an is 0.84(α is thetransfer coefficient and n is the number of cleclron in the kineticprocess).n=2.The electrode reaction mechanism has been inferred.Besides,the choices of base solution and of experiment conditions aswell as the stability of vitamin D etc.are also discussed.