共查询到20条相似文献，搜索用时 312 毫秒
1.
2.
在2020年中国单位GDP二氧化碳排放量下降40-45%目标的基础上,解析单位GDP二氧化碳排放强度的主要驱动因素,揭示经济增长质量、提高能效和优化能源结构与碳强度之间的定量关系,并对未来碳排放约束下的节能目标进行预测。 相似文献
3.
我国产业结构现状对碳排放的影响及调整对策研究 总被引：1，自引：0，他引：1
基于我国1994-2009年的数据采用多元线性回归模型来考察产业结构调整对二氧化碳排放量的影响,应用单整检验和EG两步检验法证明我国单位GDP碳排放量与产业结构之间存在协整关系.研究发现,产业结构调整对二氧化碳排放量的影响呈现出不同的特征,不同产业的发展对二氧化碳排放量有明显不同的影响.继而采用聚类分析法,以经济指标、生态指标和就业指标为衡量标准对第二产业内部各行业进行分类,并根据不同产业和行业提出相应的对策. 相似文献
4.
5.
提出一种节点重要度综合评价新方法,并在此基础上发展了网络重构多目标双层优化模型,在上层优化模型中。以最大化系统可用发电容量确定发电节点恢复顺序;在下层确定恢复路径的多目标优化模型中。以最大化恢复路径的平均重要度和最小化路径的充电电容为目标。并考虑了线路恢复时间对机组恢复的影响,提出一种基于细胞生理特性的连续动态多步凋亡优化策略其将整个电力系统网络重构划分为多步。 相似文献
6.
济南市大气污染治理优先级与优化控制研究 总被引：2，自引：0，他引：2
通过多源数值模式的模拟试验,导出不同污染源型对污染物质量浓度的贡献率,以确定大气污染治理的优先级,提出了优化投资的宏观控制措施;然后以宏观控制措施为出发点,按优化控制方法导出允许排放量及消减量,以多目标优化分析作为主要方法分步达到控制目标;最后讨论了污染控制与分散治理措施的效益,进一步发展了城市大气污染控制的方法和步骤 相似文献
7.
本文针对西门子9F型发电燃机的NO_X排放量进行了一定跟踪与分析,并提出了一些优化控制的方案,以期为我国火电厂的节能减排工作提供一些参考与理论依据。 相似文献
8.
与大电网相比,微电网系统容量很小,微电网并网运行时,其电压和频率主要跟随大电网的电压和频率,微电网内分布式电源一般采用PQ控制模式运行。微电网并网运行控制策略是对微电网内各分布式电源出力进行协调控制,实现微电网的各种控制目标,例如分布式发电/储能计划控制、联络线功率控制等,保障微电网的安全稳定运行。 相似文献
9.
10.
在基于物联网平台下的REST架构体系中,实现生产作业过程的优化调度的关键是进行作业线的支配集优化控制。传统的生产作业线的支配集控制算法采用遗传算法进行柔性工业控制,迭代步数较大,性能不好。提出一种基于生产质量—效率—成本控制的多目标模糊贴近度数学模型构建的物联网平台下的REST架构体系,实现对生产作业线支配集优化控制。开发REST物联网架构体系的工业控制系统平台,计算REST架构体系下的作业线模糊贴近度特征,得到多目标模糊贴近度数学模型,构建REST架构下的多目标作业线物联网络模型,进行优化目标控制函数设计。实现对REST物联网架构模型下的支配集实现优化控制。以某大型工业生产企业的生产作业线控制平台为例,进行实例仿真,得出该算法对多目标的作业线控制具有较好的控制精度,预测效果较好,提高了工业生产效率,具有较好的工程应用价值。 相似文献
11.
Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
12.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
13.
Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
14.
Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
15.
Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献
16.
Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
17.
Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 相似文献
18.
《中国科学院院刊(英文版)》2014,(3)
<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence 相似文献
19.
Chinese Scientists Use Earth Observation Technologies to Study and Protect Wild Camels 总被引：1，自引：0，他引：1
《中国科学院院刊(英文版)》2014,(3):267-268
<正>Chinese scientists plan to apply Earth Observation technologies to protect the critically endangered wild camels(Camelus ferus).With the help of remote sensing,satellite positioning,geographical information system and wireless sensors networks,they will be able to access the distribution and population of the wild camels and protect their habitats.The project will be carried out by the International Research Center for Wild Camel Conservation,which was jointly established earlier this year by the Institute of Remote Sensing and Digital Earth(RADI)of the Chinese 相似文献
20.
WANG Sijia 《中国科学院院刊(英文版)》2014,(2):192-194
<正>The Paul Gerson Unna Research Group on Dermatogenomics was founded in October 2012 at the Partner Institute for Computational Biology.The ultimate goal of the group is to understand the biology of skin and skin appendages. 相似文献