均质小球沿不光滑旋转球面滚动时的运动分析

重力球沿不同物体表面滚动时的运动分析属经典力学研究对象,本文讨论均质小球沿不光滑旋转球面滚动时,在不计反作用力情况下的运动状态。寻找小球无滑动滚动的实现条件,球心运动轨迹,以及小球在旋转球面上端转圈时的稳定条件,并对研究结果进行分析。     

祖暅原理的由来及证明

刘徽在发现《九章算术》球体积公式错误的基础上,构造了＂牟合方盖＂,正确指出了解决该问题的思路。祖氏父子间接求出了＂牟合方盖＂的体积,从而彻底解决了球体积计算公式的难题,并提出了祖暅原理。本文回顾了中国古代数学取得的巨大成就,激发大家的民族自豪感和学习数学史的热情,然后用高等数学的知识证明了祖暅原理,强调高等数学对中学数学教学的指导作用,增强大家学习高等数学的自觉性。     

试以哈贝马斯公共领域理论解析网络空间

公共领域理论强调三个核心因素：公众,普遍利益上形成的公众舆论,讨论的理性、批判性和平等性。网络作为新兴媒介打破了第一媒介时代散播式的传播方式,其信息的易获取性以及网络空间匿名性、去中心性等特点为公共领域的形成奠定了有利条件．网络空间出现后,私人领域和公共领域出现了“独特”融合、网络空间的舆论兼具批判性和消费性、网络和权力机构的关系发生微妙转变,网络空间孕育着公共领域的又一次转型。     

公共领域建构与晚清报刊小说社会批判的强化

晚清时期报人、读者借助于报刊小说建构起了以社会批判话语为核心的公共领域,报刊小说成为晚清时期聚集主流社会文化的载体,对于推动社会变革起到了重要作用。     

A model for the generation of public sphere-like activity in sport-themed Twitter hashtags

The social media site Twitter has been subject to significant recent criticism, because of some users’ propensity for behaviors such as bullying, racism and homophobia, and rhetorical excess. Critics suggest Twitter has changed from its beginnings, where it was seen as a site that promoted broad-based debate and advancement of democracy. In this conceptual paper, the authors suggest that those ideals can still be realized, and that Twitter can provide the venue and the motivation for the generation of Habermasian public spheres. The authors argue that society’s passion and consumption model for sport, along with technological affordances unique to Twitter, can promote behavior akin to public spheres, provided barriers to such discourse can be overcome. This analysis is the first systematic examination of the potential for public spheres to be realized within sport and social media and suggests the byproducts of such discussions can be tangible and measurable.     

‘The Talke of the Towne’: News,Crime and the Public Sphere in Seventeenth-Century London

This article reconsiders ideas of the public sphere in the seventeenth century, by focusing on how public opinion is shaped by the movement of information between media and between receivers. It contends that the scholarly preoccupation with a public sphere viewed exclusively in terms of politics obscures the fact that contemporaries did not distinguish between politics and subjects such as crime in their newsgathering. Examining the case study of James Turner, a burglar in the 1660s who became a cause célèbre in London and beyond, this article shows how crime news were eagerly exchanged, informing discussions and constructing public opinion.     

非球形惯量球

对非球形惯量球的概念进行初步的讨论,具有“各向同性”的转动惯量的非球形刚体称为非球形惯量球。     

The computer-mediated public sphere and the cosmopolitan ideal

In response to the attractive moral and politicalmodel of cosmopolitanism, this paper offers anoverview of some of the conceptual limitations to thatmodel arising from computer-mediated, interest-basedsocial interaction. I discuss James Bohman'sdefinition of the global and cosmopolitan spheres andhow computer-mediated communication might impact thedevelopment of those spheres. Additionally, I questionthe commitment to purely rational models of socialcooperation when theorizing a computer-mediated globalpublic sphere, exploring recent alternatives. Andfinally, I discuss a few of the political andepistemic constraints on participation in thecomputer-mediated public sphere that threaten thecosmopolitan ideal.``Nature should be thanked for fostering socialincompatibility, enviously competitive vanity, andinsatiable desires for possessions and even power.Without these desires, all man's excellent naturalcapacities would never be roused to develop.' Theultimate destiny for mankind, according to Kant whowrote these words in 1784, is to achieve through theuse of reason a `cosmopolitan existence' or ``thematrix within which all the original capacities of thehuman race may develop.' Ironically, however, as Habermas andothers have realized, Kant's carefully developedvision for `perpetual peace' among nations and `worldcitizenship' is now murky even as the electronicallymediated infrastructure of that matrix is rapidlydeveloping. Globalization as a process has intensifiedto the point where a new social, political, andeconomic condition has taken hold in the global arena.Recently this condition has been termed ``globality' –a term denoting a networked world characterized byspeed, mobility, risk, insecurity, andflexibility. And a debate is forming around thequestion of whether we are still in late modernity andexperiencing the culmination of modernity's inherentlyglobalizing tendency or instead we have entered thenetworked age, in which the tension between collectiveand transformative identities and the networking logicof dominant institutions and organizations heralds theend of civil society. Inthis paper assume the latter but wish to explorefurther the political and epistemic constraints onparticipation in the computer-mediated public sphere.These constraints seem certain to impact the viabilityof a cosmopolitan public sphere. In the first sectionI shall discuss James Bohman's definition of theglobal and cosmopolitan spheres and howcomputer-mediated communication (hereafter CMC) mightimpact the development of those spheres. In the secondsection, I question the commitment to purely rationalmodels of social cooperation when theorizing a globalpublic sphere. I explore recently proposed alternativeways of thinking about this issue in section three.And finally, I discuss a few of the political andepistemic constraints on participation in thecomputer-mediated public sphere that threaten thecosmopolitan ideal.     

黎曼可积的测度论观点

本文以测度论的观点叙述了黎曼积分的可积条件,并利用他们解决了一些在数学分析中不易解决的问题。     

Transforming Work into Play and Play into Work within the Domestic Sphere

This paper examines representations of urban domestic sphere and communication technologies in Playboy during the 1950s and 1960s. I argue that Playboy carved out a space for a seamless relationship between work (production) and leisure/free time (reproduction) in the domestic sphere, specifically the bachelor pad, which contributed to current notions of the live–work lifestyle. Combining work, consumption, and leisure through technology within the home permits the erosion of boundaries between work and free time. Consequently, advances in communication and entertainment technologies, consumerism and Playboy's celebration of the urban bachelor pad contributed to current definitions of the good life and reflected the paradigm shift to the post-industrial economy and the subsequent emergence of the knowledge economy.