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1.
《科教文汇》2015,(4)
数学是发展人的思维、使人变聪明的一门学科。新修订的2011年版《数学课程标准》曾明确提出:通过义务教育阶段的数学学习,学生能获得适应社会生活和进一步发展所必需的数学的基础知识、基本技能、基本思想、基本活动经验。这充分说明运用基本思想方法进行教学是今后数学教学不可缺少的一种手段,同时也是教师培养学生必须达到的重要目标之一。化归思想是一种以数学知识为载体所体现出来的数学思想和方法,是数学教与学的"灵魂",它们对老师的教学和学生的学习起着很重要作用。本文将结合数学案例,通过对案例分析化归思想方法在教与学中的应用,并提出了加强化归思维的教学对策,培养学生的化归意识和学习能力。 相似文献
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作为初中数学中最基本的数学思想,化归思想是初中数学新课标中基础知识的重要组成部分,在初中数学教学中渗透化归思想和方法是对学生实施创新教育、培养创新思维的重要保证。本文从化归思想的概念、功能,以及初中数学中化归的基本形式、化归的特点等内容出发,比较全面地介绍了化归思想这一重要的数学思想,以期为业界同仁提供一定的参考。 相似文献
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化归思想是数学中最基本的思想方法.所谓化归思想就是将一个未知、复杂、非常规的问题转化为已知、简单、常规的问题,从而使问题得以解决的一种数学解题思想.在中学数学教学中,化归方法的应用是无处不在.所以在数学教学中注意化归思想方法的培养对学生学习数学,发展解题能力无疑是至关重要的. 相似文献
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化归思想在初中数学教学中的渗透与应用 总被引：1，自引：1，他引：0
《科教文汇》2008,(4)
新课程的数学教学进一步提出了渗透数学思想方法的目标要求。化归是初中数学中最基本的数学思想方法,它有三个要素。在初中代数、几何教学内容中渗透着化归的思想方法。老师要充分挖掘教材中所蕴涵的化归思想方法,有意识地培养学生运用这一思想方法,提高学生的综合能力。 相似文献
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化归思想在初中数学教学中的渗透与应用 总被引：2，自引：0，他引：2
新课程的数学教学进一步提出了渗透数学思想方法的目标要求.化归是初中数学中最基本的数学思想方法,它有三个要素.在初中代数、几何教学内容中渗透着化归的思想方法.老师要充分挖掘教材中所蕴涵的化归思想方法.有意识地培养学生运用这一思想方法,提高学生的综合能力. 相似文献
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化归思维是数学中解决问题最基本的手段之一。在解决问题时,不是直接攻击问题,而是对此问题进行变换、转换,直至最终把问题化归为某个(些)已经解决的问题。“中学数学化归变换策略”在中学实际教学中又称为“变换与转化”的思想,它贯穿于整个中学数学教学及中学生学习数学的全过程,树立化归意识,掌握化归方法,对于迅速确定解题途径具有重要意义,也是学好数学所应具备的基本素质。 相似文献
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化归思想是数学方法论中常用基本思维方式,特殊性化归为高等数学的问题提供了一种基本方法,一般性化归更是创新数学理论的基本手段. 相似文献
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初中三年的数学学习会涉及以下几种主要的数学思想方法:化归思想、方程思想、函数思想、类比思想、分类讨论思想、教学模型思想、猜想反驳思想.在初中数学教学过程中对数学思想方法的培养,强调“两种价值”的体现,一是数学思想方法在学生学习数学过程中的价值体现,二是数学思想方法在学生的人格发展中的价值体现. 相似文献
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数学的学习包括为了适应未来社会生活所必需的数学知识和基本数学思想方法以及必要的应用技能的学习。而数学思想方法是数学的精髓．化归思想作为一种数学思想方法在解决数学问题中起着至关重要的作用。本文针对化归思想在高等数学问题中的各种应用从不同角度分类举例加以说明。 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
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. 相似文献
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A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US 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 the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
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. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
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. 相似文献
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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. 相似文献
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A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
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Puay Tang 《The Information Society》1998,14(1):19-31
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. 相似文献
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Milton Mueller 《The Information Society》2001,17(3):151-163
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. 相似文献
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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.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
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. 相似文献
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Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
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《中国科学院院刊(英文版)》2014,(3)
<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 相似文献