Galileo's Mathematical Language of Nature

Undergraduate students do not always make a clear distinction between physics and mathematics, particularly early in their studies. We offer a simple historical example and show how it can be used to illustrate some of the important differences and relationships between the two. The example is Galileo's treatment of motion under uniform acceleration, in which he uses geometry instead of algebra to represent quantities such as time and velocity and stresses the need to test the adequacy of the representation by experiment. The general importance of Galileo's work in the history of science and the fact that it is accessible to undergraduates not concentrating their studies in mathematics or the sciences make it particularly suitable for our purposes. In addition to undergraduate courses in physics or mathematics, many of the points we make should be useful in courses in the history and philosophy of science and mathematics.     

指数有界C-半群的生成算子的两个结果

在本文中我们引入指数有界C -半群的生成算子的概念 ,获得其两个基本结果     

A COMPARATIVE STUDY ON THE 1898 REFORM OF CHINA AND THE MEIJI RESTORATION

ＩＮＴＲＯＤＵＣＴＩＯＮＩｎ 1 998,ｍａｎｙｍａｇａｚｉｎｅｓｉｎｃｌｕｄｉｎｇＨｉｓｔｏｒｉ ｃａｌＲｅｓｅａｒｃｈ (Ｂｅｉｊｉｎｇ ) ,ＯｐｅｎＴｉｍｅｓ(Ｇｕａｎｇｚｈｏｕ )ａｎｄＴｗｅｎｔｙ ＦｉｒｓｔＣｅｎｔｕｒｙ(Ｈｏｎｇｋｏｎｇ )ｐｕｂｌｉｓｈｅｄａｒｔｉｃｌｅｓｉｎｓｐｅｃｉａｌｃｏｌｕｍｎｓｔｏｃｏｍｍｅｍｏｒａｔｅｔｈｅｃｅｎｔｅｎｎｉａｌａｎｎｉｖｅｒ ｓａｒｙｏｆｔｈｅｒｅｆｏｒｍｏｆ 1 898.Ｈｏｗｅｖｅｒ,ｐｅｏｐｌｅｓｅｅｍｔｏｈａｖｅｆｏｒｇｏｔｔｅｎｔｈａｔ1 998ｉｓａｌｓ…     

预置图形式激光调阻机系统的设计与实现

激光调阻机是用于电阻阻值微调的一种关键设备,由光学系统,机械运动系统.运动控制系统等组成.本文介绍了一种预置图形式激光调阻机的系统设计与论证.时此系统方案进行了理论上的认证与实践中的检验.实际应用中,依靠本方案研制的激光调阻机已投入使用,达到了设计要求.     

我国科技成果管理现状及对策分析

科技成果管理工作是我国科技管理体系的重要组成部分,为科技管理工作提供重要的决策依据,本文阐述了我国科技成果管理的现状和存在的问题,初步分析了如何在新时期更好的改进和提高科技成果管理水平,更好地为我国经济建设和社会发展服务。     

从技术角度进行竞争对手研究的有效方法--DWPI法应用

0引言 竞争是当今社会的主旋律,企业竞争则表现得更加激烈,企业欲在强手如林、变化莫测的环境中取得竞争胜利,就必须重视围绕竞争对手、竞争环境、竞争策略所进行的信息研究,即竞争情报研究,其中竞争对手研究显得尤为重要.     

新环境下情报研究的发展路向探讨

信息时代到来之际,完善情报研究的功能以适应新环境的挑战是当前情报界迫切需要解决的问题。本文在对复杂多变的环境因素分析的基础上,提出了情报研究的系统目标及发展对策。     

世居高原男子排球运动员营养状况调查

对２１名云南省世居的男排运动员进行了５天的营养调查,结果显示：膳食结构不合理,动物性食品和油脂类摄入量偏高;热源质分配比不适宜,蛋白质和脂肪含量偏高（分别为１６．１１％ 和４２．５％ ）,碳水化合物偏低（４３．３９％ ）;部分维生素和无机盐摄入不足。体格检查显示,有５０％ 的运动员的ＢＭＩ＜ ２０。生化检查显示,有７５％ 的运动员体内维生素Ｂ１营养不平不足或缺乏,有２５％ 的运动员体内维生素Ｃ营养不足。提示：长期膳食营养不合理将影响运动员身体素质和训练水平的提高。     

Similarities and differences: Measuring diversity and selecting peers in higher education

Diversity among institutions or, at least,institutional types is a policy objective that mostsystems of higher education pursue. At the same timethose systems are also concerned about equity ofaccess and the quality of educational opportunity.Individual institutions, for a variety of reasonsranging from accountability to the allocation ofscarce resources, attempt to compare or ``benchmark'themselves against other institutions. Both activitiesinvolve measurement, classification, and the selectionof peers. Although customarily addressed apart fromone another, diversity and peer selection can beconceptually closely linked within single scales ofsimilarity and dis-similarity. Existing paradigms thatexplain diversity might be too simple for reliablepeer selection and comparison, and might fail toaccount for all expressions of diversity. A case studyis used to discover the connections between diversityand peer selection, test existing paradigms, anddevelop a modified methodology that can be used forselecting peers and measuring diversity.