A Twin Study of Adult Gambling Behavior

A twin study explored the possible genetic influences on gambling behavior. Male monozygotic (MZ) twins (n = 42) revealed significantly greater similarity on gambling frequency associated with high-action games than male dizygotic (DZ) twins (n = 50). The heritability estimates for involvement in these types of games among males were moderate and significant. All MZ versus DZ comparisons among males for low-action games were nonsignificant, as were MZ versus DZ comparisons among females (n = 63) for both types of games. The findings suggest that genetic influences may be important in the origins of certain types of gambling by men.     

Software variety and hardware value: a case study of complementary network externalities in the microcomputer software industry

We estimate the effects of software provision on the valuation of hardware in the early microcomputer industry, covering the period 1981–1986. Since hardware and software technologies `co-evolve,' a discussion of the economic and technological relationships is provided to clarify the nature of the relationship between software variety and hardware price.     

How Green is My Valley? Tracking Rural and Urban Environmentalism in the Southern Appalachian Ecoregion1

Abstract Research on the social bases of environmentalism in the United States has generally found that urban residents are more concerned about the environment than rural residents. Recent research suggests this may no longer be the case, particularly in specific settings or under certain conditions. This paper examines the issue by reviewing recent survey research on rural and urban environmentalism. Tests for significant differences between urban and rural inhabitants of the Southern Appalachian Ecoregion on cognitive and behavioral dimensions of environmentalism are also conducted using data obtained from 1,239 telephone interviews. Findings are consistent with previous research showing that younger people, those with higher levels of education, and political liberals generally express higher levels of environmentalism. However, no significant rural-urban differences were found on several indicators of environmentalism. A range of conditions that are rapidly changing the character and composition of the region may help to explain why the findings do not conform to the general pattern of rural-urban differences. Overall, it appears that environmentalism has broadened its appeal in rural areas, especially in communities located near national and state parks, wildlife refuges, and other outdoor recreation sites.     

看台里有商机——体育场馆是户外广告的最后一个突破口

金融危机爆发后，大量的小公司由于受到重创而纷纷倒闭。这场危机的影响似乎还未波及到体育运动领域，因此纽约一家新起步的媒体公司，ArenaMediaNetworks（简称AMN）伙伴就是专业体育团队。AMN仅有25名员工，它通过与近50家专业室内体育馆和户外体育场的合作，出售大屏幕广告。合作伙伴包括洋基球场、箭牌体育场、芝加哥联合中心、洛杉矶道奇体育场以及麦迪逊广场花园。     

继承和发扬民族音乐的优秀传统——重读毛泽东同志《在延安文艺座谈会上的讲话》

《在延安文艺座谈会上的讲话》是毛泽东同志根据马列主义的基本原理,依据对我国文艺事业的实事求是的调查研究和客观分析而写成的一篇杰出文献,其中所阐述的对音乐文化遗产的"继承与借鉴"这个问题的看法,对我们今天继承和发扬民族音乐的优秀传统,仍然具有重大的现实意义。     

高校课余体育竞赛组织管理现状与发展对策

高校课余体育竞赛是高等学校体育教育的重要组成部分,是培养学生体育兴趣爱好、体育意识和养成良好体育锻炼习惯的重要途径。文章以湖南省部分高校为例,针对高校目前出台课余体育竞赛管理相关文件的学校较少,组织与管理的方式、方法陈旧等问题,提出只有改变观念,学校加强学生对课余体育竞赛的正确认识,制定课余体育竞赛相关政策,完善课余体育竞赛的组织与管理,才能促进高校课余体育竞赛的健康有序发展。