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Search Results: 1 - 10 of 387231 matches for " <br>陈通宝 "
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Considerations on the Development of China s Electronic Information Resources
发展我国电子化信息资源的思考

Chen Tongbao,<br>通宝
现代图书情报技术 , 1997,
Abstract: On the basis of the nation wide database survey,status and issues of the databases in China have been statistically analyzed in this paper.A comparison with the development of databases outside China has been made in order to clarify the current level of database industry and the gap to be filled.To tackle the problems confronting us,some suggestions on the further development of electronic information resources have been made.
THE DEVELOPMENT OF DATA COMMUNICATION AND THE MODE OF LIBRARY AND INFORMATION SERVICE NETWORK IN CHINA
数据通信的发展和我国图书情报服务网络建设的模式

Chen Tongbao,<br>通宝
现代图书情报技术 , 1992,
Abstract: In this article, the state-of-the-art of oversea data communication and China s data communication network are summarized. Also the structure and mode of China s national information service network are analysed and elaborated.
On Building VSAT Backbone Network of SSTCC
正在建设中的国家科委系统VSAT骨干网络

Chen Tongbao Fu Qiang,<br>通宝,傅强
现代图书情报技术 , 1997,
Abstract: The National Scientific and Technical lnformation Network (STINet) has reached a certain size after two year development, But the developing speed is reduced due to the over-high telecommunication cost. So the State Science and Technology Committee of China (SSTCC) has decided to set up the VSAT backbone network which will provide STINet with a communication platform to reduce the telecommunication cost and provide a unified transferring platform for other systems and networks of SSTCC. The article introduces and analyses the current situation of STINet, the possibility and the structur of the above project, the VAST network of SSTCC.
走向2000年的新型信息通信服务
通宝
现代图书情报技术 , 1991,
Abstract: 由于微电子技术、传输技术和计算机技术飞速发展。以及通信技术突飞猛进,通信与计算机的结合,出现了许多新型信息通信业务,如智能用户电报、可视图文、可视电话、会议电视、图文广播、电子邮政、电子数据交换等信息传递方式。本文概述了九十年代直至21世纪初新型信息通信服务的发展趋势及其对社会的影响。
欧洲联机情报市场和共同体的对策
通宝
现代图书情报技术 , 1987,
Abstract:
立足国情加快信息基础结构建设
通宝
科技进步与对策 , 1995,
Abstract: 分析了我国加快信息基础结构建设的基本条件,提出了我国不同阶段信息基础结构的建设的目标、任务和有关政策法建设的构想。中国信息基础结构建设
Real-Time Parallel Operation Scheduling Structurized by Petri Nets
用Petri网结构化的方法求解实时并行运算调度问题

Chen Chen,<br>
自动化学报 , 1992,
Abstract: A method for scheduling operations with given precedence relation under multiple resources is proposed. The time duration of each operation is deterministic. Minimum time span of parallel processing without and with resource restrictions are solved. Modelling by Petri Nets makes the problem highly structurized, thus limiting the search space merely to feasible solutions subject to precedence relation. These engineering approaches are solved for analytical solutions.
论p3q2阶群的构造

松良<br> 松 良
- , 2016,
Abstract: 设p,q为奇素数,且p>q,而G是p3q2阶群.利用有限群的子群之间的不同作用,讨论了群G的完全分类问题,并获得了其全部构造.
Chemical attraction of fig volatiles to their pollinating fig wasps
榕果挥发物对传粉榕小蜂的吸引作用

CHEN Chun,<br>
生态学报 , 2004,
Abstract: The specificity of the relationship between fig species and their particular agaonine pollinators (Hymenoptera: Chalcidoidea Agaonidae) has long been regarded as the extreme example of co-evolution. The maintenance of the fig-fig wasp mutualism system is strongly dependent on the chemical orientation of pollinating fig wasps using fig volatiles. The pollinating fig wasps trace the fig volatiles of their particular host and enter the figs at receptive phase (female flower phase) only, where they oviposit for themselves or pollinate for their partners.Field assay and olfactometry experiments were designed to examine the chemical basis of the species-specific mutualism and the difference between receptive fig volatiles and non-receptive ones in attracting pollinators. Three tropical fig species: Ficus hispida, F.auriculata and F.semicordata, and their corresponding pollinating fig wasps Ceratosolen solmsi marchali, (C. emarginatus) and C.gravelyi were chosen for tests. Fig volatiles including 12 info-chemicals and 3 dichloromethane extracts of figs in receptive and inter-floral phases were tested. The field experiments were conducted in Xishuangbanna Tropical Botanical Garden in Yunnan province of China. Sticky traps with cotton balls contained 0.5ml solvent or fig volatile compounds were set near fig trees of F. hispida and (F. auriculata) in male phase. Every day at 12:00 and 18:00, the numbers of fig wasps in each trap were recorded. Each observation lasted 2 weeks. Data were analyzed by the Mann-Whitney U test. The results showed that geraniol was significantly attractive to C. solmsi marchali (p<0.05), while vanillin and linalool were attractive in lesser degrees only (p<0.10). Linalool and the extract of receptive figs of F. auriculata were significantly attractive to C. emarginatus, but the number of the wasps trapped by the inter-floral fig extract was even lower than the control. Furthermore, a four-arm olfactometer was used to test the responses of the pollinating fig wasps to 12 fig volatile compounds. The wasps trapped in the arm treated with volatile compound and in the control arm were recorded respectively. Data were analyzed by a paired t-test. The results showed that C. gravelyi were significantly attracted by geraniol and terpineol (p<0.05). The responses of C.solmsi marchali and C.gravelyi to 12 info-chemicals were different, but they both preferred geraniol, linalool, farnesol, vanillin and terpineol to other compounds. C.emarginatus showed greater preference for the receptive fig extracts than the inter-floral ones.The results suggest that the fig-fig wasp specificity might result from the specific combination of several major fig volatile compounds and some particular minor volatile compounds. The results also indicate that pollinating fig wasps have preferences for receptive figs.
A study on pollination ecology of Ficus virens and its insect pollinators
雀榕及其传粉昆虫传粉生态研究

CHEN Yong,<br>
生态学报 , 2001,
Abstract: Ficus virens is monoecious,with each syconium bearing both male and female flowers.The female flowers are divided into long-styled flowers and short-styled ones,but both bear fruits and form galls and are not separated physicologically.In these syconia live 4 kinds of insects of Chalcidoidea,of which two species of Agaonidae are the pollinators of Ficus virens,especially Blastophaga sp.is a main pollinator of Ficus virens and a legitimate companion of the mutualism system.Blastophaga coronata is the secondary pollinator and also the competitor of the main pollinator.Sycophila and Ormyrus are the parasites of the above two fig wasps,but male Ormyrus sp.also takes part in digging holes of dispersal in the syconia.This article for the first time reports the mutualism relationship between fig trees with monoecism and its pollinators under the seasonal environmental stress in China.The article also discusses the sustaining countermeasures of the mutualism system.
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