分割区域

3个面积相等的圆相交,最多能分割出7个区域。如果6个面积相等的圆相交,最多可以分割出多少个区域呢?最多可以分割出31个区域。2个面积相等的圆相交最多能分割出3个区域,3个面积相等的圆相交最多能分割出7个区域.     

火星探测 永不言败

正为了探索火星这颗太阳系中最近似地球的行星,人类已发射了41个探测器(苏联/俄罗斯19个,美国19个,日本1个,欧空局1个,中国1个),其中19个成功,21个失败,1个正在飞往火星,成功率还不到一半。火星探测就是在一次又一次的失败中不断向前推进着。     

中国谷精草属的新资料

 本文报道了谷精草属3个新系，7个新种、5个新变种、2个新组合、3个新记录、修正了5个种的特征记载，新归并学名15个，共涉及全国32种8变种中的34个。     

云南省老科协组织发展迅速

云南省老科协组织的团体会员逐年增加,已经由2009年底的82个增加到2010年底的91个,其中,省老科协直属分会（专业组）24个（其中行业专业分会17个、研究院分会4个、企业分会3个）、省高教老科协及12所高等院校老科协、13个州（市）老科协、41个县（市、区）老科协。     

“养子防老”让男人“一夫多妻”

一个男人能娶几个老婆,其实是由经济原因决定的。一夫多妻为何盛行?一夫多妻,一个男人娶几个老婆在人类历史上的大多数国家都流行。大家比较熟悉的中国历史名人中,郑成功有8个妻妾、胡雪岩36个、张作霖6个、李鸿章4个。一份人类学研究报告,调     

对承德市农技协发展状况的调查与思考

承德市农技协基本情况 河北省承德市现有农技协246个,会员37418户,联系农户163679户。按行业分布分,种植业110个,占44．7％,养殖业86个,占34．9％,农产品加工类28个,占11．4％,其他22个,占9％;按登记注册情况分,在民政部门登记的有143个,进行合作社登记（工商部门登记）的有48个,在民政和工商双重登记的有28个,未登记但开展活动较好的有55个。     

八角属植物的分类学订正

根据对18个国家和地区120个标本馆收藏的万余份八角属植物标本的研究,提出3个新组合,对13个种、6个亚种、3个变种和2个变型作了归并,确认全世界现有八角属植物34种3亚种和1变种。     

远古留下的古怪石球

精巧的古代石球 这些石球非常独特,它们并不是单纯的球形,而是球面上有多个特别规则的凸起,数量不等,有的有3个凸起,有的有4个、5个,有50%的石球,表面有6个凸起,之外,7个到160个凸起的也有。     

2010年数理和地球科学领域国家重点实验室评估工作结束

国家自然科学基金委员会于2010年组织实施了11个数理领域、37个地球领域国家重点实验室的评估工作。参加评估的全部为国家重点实验室,从2010年开始部门重点实验室不再参评。数理领域11个参评实验室6个隶属教育部,5个隶属中国科学院。地球领域37个参评实验室     

华中农业大学

华中农业大学是教育部直属、“211工程”建设的国家重点大学。学校建有国家级、省部级研发基地24个,其中国家重点实验室2个,国家专业实验宦1个,国家工程(技术)研究中心3个,国家育种中心6个,省部重点实验室7个,省部研发中心5个。大学科技园是国家级武汉东湖高新技术开发区核心园     

Students' Reactions to the Introduction of Videoconferencing for Classroom Instruction

This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors.     

Cooler temperatures inductive to locust outbreaks

Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007.     

Exploring Multiplexity: Social Network Structures in a Computer-Supported Distance Learning Class

A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.     

The Role of Intermediating Institutions in the Diffusion of Electronic Data Interchange (EDI): How Industry Associations Intervened in Denmark, Finland, and Hong Kong

Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies.     

How Electronic Publishers are Protecting Against Piracy: Doubts About Technical Systems of Protection

The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means.     

Rough Justice: A Statistical Assessment of ICANN's Uniform Dispute Resolution Policy

Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP.     

Prevalence of soft neurological signs in Chinese people

Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.     

Monoculture Rubber Plantations Have Negative Ef ects on Controlling Splash Erosion

<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence     

Chinese Scientists Use Earth Observation Technologies to Study and Protect Wild Camels

<正>Chinese scientists plan to apply Earth Observation technologies to protect the critically endangered wild camels(Camelus ferus).With the help of remote sensing,satellite positioning,geographical information system and wireless sensors networks,they will be able to access the distribution and population of the wild camels and protect their habitats.The project will be carried out by the International Research Center for Wild Camel Conservation,which was jointly established earlier this year by the Institute of Remote Sensing and Digital Earth(RADI)of the Chinese     

More than Skin Deep – Understand Skin Biology by Means of Dermatogenomics

<正>The Paul Gerson Unna Research Group on Dermatogenomics was founded in October 2012 at the Partner Institute for Computational Biology.The ultimate goal of the group is to understand the biology of skin and skin appendages.