Getting from here to there – energy technology transformation pathways in the EMF27 scenarios     

Volker Krey  Gunnar Luderer  Leon Clarke  Elmar Kriegler 《Climatic change》2014,123(3-4):369-382

Based on a large number of energy-economic and integrated assessment models, the Energy Modeling Forum (EMF) 27 study systematically explores the implications of technology cost and availability for feasibility and macroeconomic costs of energy system transformations toward climate stabilization. At the highest level, the technology strategy articulated in all the scenarios in EMF27 includes three elements: decarbonization of energy supply, increasing the use of low-carbon energy carriers in end-use, and reduction of energy use. The way that the scenarios differ is in the degree to which these different elements of strategy are implemented, the timing of those implementations, and the associated macroeconomic costs. The study also discusses the value of individual technologies for achieving climate stabilization. A robust finding is that the unavailability of carbon capture and storage and limited availability of bioenergy have the largest impact on feasibility and macroeconomic costs for stabilizing atmospheric concentrations at low levels, mostly because of their combined ability to remove carbon from the atmosphere. Constraining options in the electric sector such as nuclear power, wind and solar energy in contrast has a much smaller impact on the cost of mitigation.  相似文献   

Erratum to: Analysis of factors controlling soil N2O emission by principal component and path analysis method     

Can Chen  Deli Chen  Jianjun Pan  Shu Kee Lam 《Environmental Earth Sciences》2014,72(5):1519-1519

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Preparation of Silver Nanoparticles Film and the Adsorption of Iodide     

GAO Can  HU Yaoqiang  ZHANG Huifang  YE Xiushen  LI Quan  LIU Haining  WU Zhijian 《《地质学报》英文版》2014,88(Z1):313-314

正Iodine and iodine compounds are widely applied in medicaments,dyes,energy materials,food additives etc.The development and utilization of iodine resources have attracted much attention.A large amount of iodide is  相似文献   

长三角创新产学合作与企业创新绩效:尺度与效应北大核心CSCDCSSCI     

宓泽锋  尚勇敏  徐维祥  曾刚  周灿 《地理研究》2022,41(3):647-662

产学合作网络是长三角创新共同体建设的重要方面,而当前经济地理学相关研究集中在“本地/全球”二元尺度讨论上,缺乏多尺度产学合作效应的比较分析。基于IncoPat专利数据,本文从尺度和效应视角探讨了长三角创新产学合作与企业创新绩效的关系,得到以下结论:①长三角创新产学合作的空间格局呈现以省会城市为中心的星芒状结构,核心城市占据的网络优势地位能够助力其在网络中获取创新资源,并且高校资源的不均衡分布特征进一步巩固了省会城市的优势地位,使得长三角创新产学合作格局具有明显的路径依赖特征。②本省与长三角区域尺度创新产学合作对企业创新绩效的影响要显著高于其他尺度。从区域尺度客观看待高校在空间创新进程中的作用尤为重要。③长三角创新产学合作的平均距离与企业创新绩效间呈现显著的倒“U”型关系,并且工科院校产学合作的作用和极值点均要大于综合院校和其他院校。由此,本文提出以下建议:一方面应该加快推进以区域尺度创新产学合作为重点的产学合作体系建设;另一方面应当强化薄弱地区产学合作的多尺度耦合网络建设,着力提升薄弱地区的网络地位。  相似文献   

北斗静态定位实验与精度分析     

王仲锋  林灿  历亮 《东北测绘》2014,(1):17-18

通过实际测试,将北斗和GPS进行对比,了解北斗静态定位的实际定位精度情况。按照E级网测试的结果表明,北斗和GPS定位的平面点位平均中误差分别为2．51mm和0．75mm,证明北斗系统和GPS的平面定位精度基本在同一量级上,能够满足静态定位测量的需要。  相似文献   

Book reviews     

Elmar R. Reiter 《Meteorology and Atmospheric Physics》1991,47(1):87-87

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THE IMPACT-FLOOD CONNECTION: DOES IT EXIST?*     

Alexander Deutsch  Christian Koeberl  Joel D. Blum  Bevan M. French  Billy P. Glass  Richard Grieve  Peter Horn  Elmar K. Jessberger  Gero Kurat  Wolf Uwe Reimold  Jan Smit  Dieter Stöffler  Stuart Ross Taylor 《地学学报》1994,6(6):644-650

In a recent article in Terra Nova, Kristan-Tollmann and Tollmann (1994) suggested that the Biblical Flood can be explained by seven fragments of a comet that impacted the ocean at seven locations on Earth at 03.00h (C.E.T.) on 23 September, 9545 yr BP. We demonstrate that all the ‘geological proofs’ that allegedly support their conclusions are not supported by the available data on impact cratering. Their hypothesis is based on insufficient and ambiguous data, selective citation, and incomplete comprehension of previous research.  相似文献   

Cosmological Models with Variable G and Λ     

Can Battal Kılınç 《Astrophysics and Space Science》2004,289(1-2):103-109

Einstein's equations with variable gravitational and cosmological constants are considered in the presence of a perfect fluid for the anizotropic Bianchi I universe in a way which conserving the energy-momentum tensor. Two solutions are found, one of which the cosmological term varies inversely with power law of time. The other of which cosmological term is constant.  相似文献   

Space-Time Geometry of Quark and Strange Quark Matter     

hsan Yilmaz  Can Akta 《中国天文和天体物理学报》2007,7(6):757-763

We study quarkand strangequarkmatter in the contextof generalrelativity.For this purpose,we solve Einstein's field equations for quark and strange quark matter in spherical symmetric space-times. We analyze strange quark matter for the different equations of state (EOS) in the spherical symmetric space-times,thus we are able to obtain the space-time geometries of quark and strange quark matter. Also,we discuss the features of the obtained solutions. The obtained solutions are consistent with the results of Brookhaven Laboratory,i.e. the quark-gluon plasma has a vanishing shear (i.e. quark-gluon plasma is perfect).  相似文献   

湘中古台山金锑矿床变形序列、成矿事件及控矿构造     

柏道远  李彬  江灿  段爱军 《矿床地质》2023,42(2):229-252

湘中古台山金锑矿位于雪峰构造带西南段东北部,发育SN向金矿脉和NW向金锑矿脉2类矿脉。前人提出SN向和NW向断裂为容矿构造,并获得了印支期成矿的⁴⁰Ar-³⁹Ar同位素年龄,但对容矿断裂的性质、形成时代以及2类矿脉的时代关系缺乏研究和认识。鉴于此,文章通过地表和井下露头构造以及矿化蚀变的观测、解析,结合区域构造特征、区域构造演化和测年资料等,厘定了古台山金锑矿区构造变形序列及其时代、不同类型矿脉的成矿时代和构造背景,探讨了构造控矿规律及动力机制。主要认识如下：(1)研究区自早至晚经历了5期主要变形事件：志留纪晚期受到NWW向挤压,形成NNE向板劈理、NNE向褶皱(水车背斜)、SN向顺层断裂、逆冲剪切破裂和断裂;中三叠世晚期受到NNW向挤压,局部形成NEE向轴面劈理;晚三叠世受到SN向挤压,形成EW向褶皱、NW向—NNW向右行走滑断裂和剪切破裂、NNE向左行走滑断裂和剪切破裂、EW向逆冲剪切破裂等;中侏罗世晚期受到NWW向挤压,形成EW向右行剪切破裂和断裂;古近纪中晚期受到NE向—NNE向挤压,形成SN向—NNE向右行剪切破裂和断裂、EW向—N...  相似文献