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1.
西部资源型城市的产业转型研究 总被引：28，自引：0，他引：28
资源型城市在西部地区扮演着增长的重要角色，同时也面临着十分紧迫和艰巨的产业转型任务，本文通过对资源型城市产业转型的实证研究，提出了不同条件下资源型城市产业转型的模式，针对西部资源型城市的实际状况，提出了推动西部资源型城市产业转型的对策建议。 相似文献
2.
珠三角地区建设用地扩张与经济、人口变化之间相互作用的时空演变特征分析 总被引：8，自引：0，他引：8
改革开放以来珠三角地区社会经济发展迅速,城市建设用地急剧扩张,同时这些变化之间呈现出既相互依赖又相互制约的复杂关系。通过对1979-2009年间遥感影像的分类解译,获得珠三角地区四期间隔为10年左右的土地利用变化数据,结合生产总值、常住人口等统计数据,定量分析过去30年来珠三角地区城市建设用地扩张、生产总值、常住人口的时空变化及其相互作用关系演变特征,结果表明:1珠三角地区的建设用地面积占地区总土地面积的比重已从0.5%上升到了10.8%,其中深圳、东莞已超过了40%,这些建设用地的增加主要是以农业用地的减少为代价;2珠三角地区常住人口与经济增长有明显的相关性:2000年以前人口每增长1万人,经济增长3.2亿元;2000年以后变为16.2亿元/万人;3整个区域尺度上常住人口、生产总值与建设用地具有很好的线性关系。根据线性回归方程,珠三角地区的常住人口每增长1万人,城市建设用地面积大约增长0.99km2;生产总值每增长1亿元,城市建设用地面积增长约0.16km2。但是生产总值与建设用地呈现出复杂的关系:在城市扩张的初期,经济增长中土地资源的贡献度较大,生产总值与建设用地表现出紧密的幂函数关系;随着经济的发展和产业结构升级转型,土地资源的贡献度逐渐下降,经济增长与建设用地扩张的相关性显著下降。 相似文献
3.
本文通过构建时间和个体的固定效应模型,利用2013—2020年中国内陆地区254个城市面板数据,实证检验了数字经济对经济高质量发展的影响及其作用机制。研究结果表明：数字要素能够显著促进城市经济高质量发展;数字要素可以通过提升地区产业结构来促进经济高质量发展;对于南北地区而言,相对于南方,北方地区数字要素对经济高质量发展的影响更大;以GDP衡量地区经济增长使得数字要素的影响被弱化,采用经济高质量发展指标衡量显示数字要素提升带来的经济增长效应强于传统GDP衡量的地区经济增长;最后,本文的研究结论为提升地区数字经济发展提供了依据及路径。 相似文献
4.
国家级新区带动欠发达地区“弯道超车”研究 《科学学研究》2022,40(12):2194-2204
兰州新区被赋予了“西北地区重要经济增长极”的战略使命，然而这种旧有的政策“创新”还能够发挥政策效应，实现欠发达地区发展的“弯道超车”吗？为了廓清此问题，本文通过合成控制法，收集了2005-2019年15个省会城市的面板数据，以2012年兰州新区的设立为准自然实验，检验了设立兰州新区的经济增长政策效应。实证结果表明：兰州新区的设立确实带动了地区经济的增长，且这一结论具有稳健性，说明设置国家级新区的老政策“创新”依然可以作为欠发达地区“弯道超车”的工具带动地区经济增长，但兰州新区与其他国家级新区的发展仍存在一定的差距，表明政策创新需要与之匹配的政策基础设施，未来需要建设、完善它们。 相似文献
5.
本文基于中国2004-2018年249个城市的面板数据,结合SBM模型测度的城市绿色全要素生产率指标,通过空间杜宾模型考察中国区域知识产权保护对绿色全要素生产率的直接效应与溢出效应,探讨该空间效应的异质性特征并揭示知识产权保护促进地区绿色发展的具体路径。本文发现,知识产权保护能够同时提升本地区和邻区绿色全要素生产率,且对邻区绿色发展的促进作用远高于本地；对位于东部地区、城市规模大以及交易市场正常运行的城市而言,知识产权保护的绿色发展促进效应更为显著；地区知识产权保护主要通过促进技术进步以达到提升地区绿色经济增长的效果。 相似文献
6.
【目的】本文旨在评价黄河流域包容性绿色增长绩效，探析其包容性绿色增长绩效的地区差距，为新发展阶段黄河流域协同推进减污降碳、实现共同富裕提供参考。【方法】基于“经济-环境-社会”分析框架构建包容性绿色增长绩效投入产出指标体系，借助EBM模型的Global-Luenberger指数对2007—2019年黄河流域城市包容性绿色增长绩效进行科学评价，运用泰尔指数和方差分解方法分别从空间和结构双重视角深入剖析其包容性绿色增长绩效地区差距来源，并采用地理探测器从内源和外源两方面揭示黄河流域包容性绿色增长绩效差距的驱动因素。【结果】样本考察期内，黄河流域包容性绿色增长绩效呈现波动上升态势，流域内表现出下游>上游>中游的地区非均衡特征。地区内差距是黄河流域包容性绿色增长绩效空间差距的主要来源，技术进步的差距、非期望产出生产率差距以及社会产出生产率差距对其结构差距的贡献呈依次递减。影响因子交互作用后对黄河流域包容性绿色增长绩效地区差距解释力远超单因子，但其作用程度存在地区异质性。【结论】缩小中游、下游地区内部差距是未来黄河流域提升包容性绿色增长绩效的重点方向，同时应注重内外源动力的匹配程度，... 相似文献
7.
晋升锦标赛下,官员在有限任期内存在晋升预期差异,由此导致的短视行为的变化可能对创新产出造成影响。然而现有文献并未从官员晋升动机视角深入研究城市创新的制度动因,也未曾厘清官员任期等政治体制对创新活动的具体影响机制。本文利用2004—2016年285个城市的面板数据,通过多元统计回归分析,实证检验了官员任期如何通过经济增长目标影响城市创新的机制路径,并从土地财政、环境治理视角提出了新机制路径。研究发现：(1)相对于市长,市委书记任期对城市创新的影响更大,且呈现出显著的倒U型关系;(2)市委书记的更替显著抑制了城市创新水平的提升;(3)机制分析发现,市委书记的任期通过动态影响经济增长目标制定,土地财政依赖以及环境治理水平进而对城市创新产生影响。譬如当经济增长目标越高,官员越倾向于采用短视的扩张策略刺激经济,进而减少对创新活动的投入;(4)异质性分析发现在市场化条件较好,东部以及城市规模较大的地区,市委书记任期对创新的U型特征仍然显著。本文建议政府在推进财政分权体制改革时,应采用因地制宜的推进方式,将“有效市场”与“有为政府”更好地结合起来。本文研究结论丰富了晋升锦标赛理论的经验证据,有助于理... 相似文献
8.
在我国各项事业均取得较大进展的今天,人们对于各种能源的需求也相应的有所增长,特别是在当前的建筑智能化与城市信息化建设的影响下,水利水电工程在我国水资源比较充裕的地区得到了较好的建设。它可以通过各项工程的合理设计来实现水资源的合理利用,发电、分洪、农业灌溉等等都是可以实现的。但是在具体的水利水电枢纽工程中渗透问题是比较突出的,因此本文围绕水利水电枢纽工程渗透问题的防治技术展开了简要的探讨。 相似文献
9.
城市经济社会发展是指衡量一个地区经济、民生和生态等多方面间的协调状态。本文从经济发展、社会民生、科技进步、资源环境这4个准则方面建立了包含36个指标的城市经济社会发展评价指标体系；本文通过集对分析方法，将不同单一评价方法对最好评价排序的同一度和最坏评价排序的对立度结合起来，得到最终的统一城市评价结果，解决变异系数赋权、离差法赋权等不同评价方法排序不一致的问题。本文以我国15个副省级城市为实证样本，实证结果表明：中国副省级城市经济社会发展存在明显的地区差异。南方地区的经济社会发展水平明显优于东北地区和中西部地区，沿海城市较内陆城市排名靠前。其中，深圳、广州、杭州经济社会发展综合排名位于前三，沈阳、长春为于末二位。 相似文献
10.
2000-2012年中国地级以上城市空间弹性分析 总被引：1，自引：0，他引：1
中国快速城镇化进程中土地城镇化与人口城镇化的不协调导致城市土地蔓延、集约程度低,研究城市土地的扩张速度和程度,并进行城市间的横向对比分析,对于城市增长边界划定、统筹城市空间规划具有重要意义。城市在发展过程中,城市用地面积、人口数量变化表现为城市人口密度随时间变化,一定程度上反映了城市土地的扩张程度和内部发展潜力,称之为城市空间弹性。以中国263个地级以上城市为样本,以2000-2012年间城市人口密度及其变化率为基础,采用位序评分法构建计算简便、横向可比的城市空间弹性指标。根据弹性计算结果将城市划分为高弹性、较高弹性、中等弹性、较低弹性和低弹性5个等级。中国东部地区高弹性城市占比较高、中部地区以较高弹性和中等弹性城市为主、西部地区城市弹性主要为中等以下水平。研究期内绝大多数样本城市人口密度降低,城市空间弹性增加,在2000-2006年间尤为明显。进一步结合中国五大城市群分析看出,总体上经济发达地区城市空间弹性较大,但是城市群中的核心城市弹性中等或较小。根据城市空间弹性计算结果可以更加合理确定城市增长边界划定的优先次序以及进行刚性和弹性边界的程度控制。 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.
A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
16.
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
17.
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
18.
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
19.
Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
20.
《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