Residential use of firewood in Northern Sweden and its influence on forest biomass resources

Firewood is society’s oldest source of household energy and is still extensively used around the world. However, little is known about firewood usage in technologically advanced countries with high energy consumption. Some key issues include quantities of firewood currently used and future trends, as well as the influence of this usage on available biomass resources. This study addresses those issues through a postal questionnaire to 1500 of the firewood using households in a region in Northern Sweden. One-third of households produced 11-20 solid m³ of firewood per year. Three-fourths expected their production to be unchanged or increase during the coming five years. A large proportion of young producers indicated long-term continuation of firewood usage. Half (53%) of the firewood producing households owned forest and thereby had free access to wood. Produced firewood volume corresponded to 4-8% of the region’s roundwood volume harvested for industrial purposes. The use of firewood is suggested to influence decisions of private forest owners about management and harvest of forest biomass, and, thus, affect supply for bioenergy and other uses. With further incorporation of firewood usage into forest biomass management regimes, larger biomass quantities are likely to be available for industrial uses.     

潘家口水电厂计算机监控系统改造及总结

提出了潘家口水电厂计算机监控系统改造的初步方案,经深入分析后确定了最终改造实施方案,并对现场施工、调试过程及改造经验进行了总结。     

陕甘宁气田～银川输气管线阴极保护有效性评价

本文通过对陕甘宁气田～银川输气管线阴极保护系统调查、管/地电位及开/关电位测试,分析确定出管线所经地区土壤IR 降值,并对阴极保护效果做出评价。     

MCRC��ǻ��չ��ճ�̽

本文根据MCRC引进装置的情况,对加拿大Delta公司的MCRC硫回收工艺作了初步探索,介绍了该方法的工艺特征,并评述了引进装置的性能考核结果。文中还结合四川气田建厂的环保要求,评价了MCRC方法的使用价值及意义。     

民生新闻在构建和谐社会中的作用

民生新闻是近年出现的一种本土化的新闻模式,它以其关怀民生的情怀、深刻独到的见解越来越受到广大受众的拥护和记者的青睐。民生新闻的宗旨是关注民生,为民服务,这种关注不是无目的的、无章法的,而是要通过对民生问题的关注和反映,达到建设和谐社会的最终目的。这方面民生新闻大有作为。     

Quality perception when streaming video on tablet devices

The proposed work aims at analyzing the quality perceived by the user when streaming video on tablet devices. The contributions of this paper are: (i) to analyze the results of subjective quality assessments to determine which Quality of Service (QoS) parameters mainly affect the users’ Quality of Experience (QoE) in video streaming over tablet devices; (ii) to define a parametric quality model useful in system control and optimization for the considered scenarios; (iii) to compare the performance of the proposed model with subjective quality results obtained in alternative state-of-the-art studies and investigate whether other models could be applied to our case and vice versa.     

Biasing public opinion: Computerized continuous response measurement displays impact viewers’ perceptions of media messages

Computerized displays of continuously acquired audience response measures have become an increasingly common component in television, particularly in political campaign media coverage. However, the effect of such presentations on consumer’s perceptions of both the presenters and their messages remain unclear. To address this concern, simulated computerized continuous response measurement (CRM) graphics were overlaid onto apolitical video content to produce three (negative, neutral, positive) experimental manipulations. The findings revealed considerable symmetry between the valence of the CRM graphics and research participant responses. Evaluations of the presenter and message were significantly more negative following negative CRM graphic manipulation exposure (compared against the neutral and positive conditions) suggesting that CRM graphics can be a powerful device for influencing viewers’ judgments.     

基于LSA和pLSA的多文档自动文摘

本文提出一种基于LSA和pLSA的多文档自动文摘策略。首先,将多个文档切分成自然段,以自然段作为聚类单位。采用了新的特征提取方法构建词-自然段矩阵,利用LSA对词-自然段矩阵进行奇异值分解,使得向量空间模型中的高维表示变成在潜在语义空间中的低维表示。然后,采用pLSA将数据转换成概率统计模型来计算。在文摘生成的过程中采用基于质心的文摘句挑选办法得到文摘并输出。实验表明,本文提出的方法有效地提高了生成文摘的质量。     

基于时间戳的多文档自动文摘

网站的新闻专题往往包含大量的网页,多文档自动文摘可以帮助人们从中快速获取主要信息。该文提出了利用时间戳改善文摘句子抽取质量和排序的方法。介绍了句子抽取方法、句子重要度计算、句子冗余减小方法。实验表明,形成的文摘性能良好,可以应用于实际系统中。