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随着人类环境意识的觉醒与升华,引发了对自身生存环境的更深层次的思考。本文就环境承载力的内涵与外延以及它既会造成贫困又可解脱贫困的关键作用进行了研究和探讨。 相似文献
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Sara P. Bombaci Cooper M. Farr H. Travis Gallo Anna M. Mangan Lani T. Stinson Monica Kaushik Liba Pejchar 《Conservation biology》2016,30(1):216-225
Scientists are increasingly using Twitter as a tool for communicating science. Twitter can promote scholarly discussion, disseminate research rapidly, and extend and diversify the scope of audiences reached. However, scientists also caution that if Twitter does not accurately convey science due to the inherent brevity of this media, misinformation could cascade quickly through social media. Data on whether Twitter effectively communicates conservation science and the types of user groups receiving these tweets are lacking. To address these knowledge gaps, we examined live tweeting as a means of communicating conservation science at the 2013 International Congress for Conservation Biology (ICCB). We quantified and compared the user groups sending and reading live tweets. We also surveyed presenters to determine their intended audiences, which we compared with the actual audiences reached through live tweeting. We also asked presenters how effectively tweets conveyed their research findings. Twitter reached 14 more professional audience categories relative to those attending and live tweeting at ICCB. However, the groups often reached through live tweeting were not the presenters’ intended audiences. Policy makers and government and non‐governmental organizations were rarely reached (0%, 4%, and 6% of audience, respectively), despite the intent of the presenters. Plenary talks were tweeted about 6.9 times more than all other oral or poster presentations combined. Over half the presenters believed the tweets about their talks were effective. Ineffective tweets were perceived as vague or missing the presenters’ main message. We recommend that presenters who want their science to be communicated accurately and broadly through Twitter should provide Twitter‐friendly summaries that incorporate relevant hashtags and usernames. Our results suggest that Twitter can be used to effectively communicate speakers’ findings to diverse audiences beyond conference walls. 相似文献
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杜振民 《防灾减灾工程学报》1993,(1)
在国内外地震学界,围绕要不要公开进行地震预报,能不能承担社会性地震预报的重任,长期争论不休。其内在的原因是地震灾害的影响,地震科研的特点,特别是现阶段地震预报水平过低。在地震预报难度甚大,而实际工作中又不能放弃的形势下,应采取适当的地震预报战略。正确评价、正面宣传地震预报水平,以综合减灾措施支持地震预报,严格把好社会性短临预报关口,掌握好内部预测意见向社会发布的过渡是十分重要的。 相似文献
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简要分析了沈阳这一特大城市建立资源循环型社会的必要性 ,对如何尽快形成资源循环型体系提出了主要对策 相似文献
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介绍了沈阳市在生态城市建设中的成绩 ,提出积极推进生态城市建设中要切实注重的几个问题———进一步完善森林城市生态规划 ,提高水资源利用率 ,建设节水型社会 ,保护地下水 ,使人民群众喝上安全合格的水 ,提出对策建议。 相似文献
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我国水资源学术交流十年总结与展望 总被引:3,自引:0,他引:3
水资源是基础性的自然资源和战略性的经济资源,是一个国家综合国力的有机组成部分。目前,国家已将水资源列为与粮食、石油资源并列的三大战略资源之一。随着经济社会快速发展,水资源供需矛盾越来越突出,水资源已成为制约国民经济发展的重大"瓶颈"。因此,水资源研究已成为支撑我国可持续发展的重要学科领域。论文在大量文献分析的基础上,阐述了水资源研究发展过程;介绍了近十年来中国自然资源学会水资源专业委员会主办的主要学术交流情况,总结了近期我国水资源研究进展;在以上分析的基础上,对水资源学科发展趋势进行了分析,并对近期水资源研究进行展望,提出未来十年我国水资源学术交流发展方向。 相似文献
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Optimization of the recovery of plastics for recycling by density media separation cyclones 总被引:1,自引:0,他引:1
Gent Malcolm Richard Menendez MarioToraño Javier Torno Susana 《Resources, Conservation and Recycling》2011,55(4):472-482
Material recovery processes are presented as the optimum option for recycling plastic wastes as a means of recovering hydrocarbon resources. There exist a large variety of automated material recovery processes for recycling of such wastes but each with significant limitations. Of these, the separation based on differences in densities is advocated as the optimum process either for producing recycled products or preparing wastes for subsequent recovery processing.Density separation processes based on cyclone type density media separation (DMS) is presented as an important, potential method for increasing plastics recycling process capacities. It is demonstrated to have the capacity to separate a significantly larger range of particle sizes than those presently processed industrially. The mathematical relationship for the prediction of quality of typical LARCODEMS type density media separations by particle size and density as expressed by the Ecart Probable is presented.A proposed device configuration is presented for density media separation to optimize the recovery and purity of both density fractions produced. It is also suggested that to be economically viable, a large scale of operation is required for industrial plastics recycling operations recovering and producing a number of different plastics with a purity to be used as a substitute for virgin material. 相似文献
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