Multiband optical photometry and bolometric light curve of the Type Ia supernova 2004S     

Kuntal Misra  Atish P. Kamble  D. Bhattacharya  Ram Sagar 《Monthly notices of the Royal Astronomical Society》2005,360(2):662-668

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XMM–Newton observations of GB B1428+4217: confirmation of intrinsic soft X-ray absorption     

M. A. Worsley  A. C. Fabian  A. Celotti  K. Iwasawa 《Monthly notices of the Royal Astronomical Society》2004,350(4):L67-L71

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张家口—渤海地震带岩石圈磁场时空变化特征     

张海洋  李博  苏树朋  王朝景  刘德强  赵慧琴  毛丰龙 《地震》2022,42(1):133-144

利用2016—2018年3期华北地区流动地磁矢量原始测量资料, 经数据计算获得2期华北地区和张家口—渤海地震活动带及邻区岩石圈磁场时空变化模型。 研究结果显示: 张家口—渤海地震带岩石圈磁场变化空间分布不均匀, 具有明显的分区特征, 在张家口段(西段)与北京段(中西段)分界处和北京段(中西段)与唐山段(中东段)分界处岩石圈磁场各要素具有明显的异常变化, 如水平矢量存在转向和幅值变化, 磁偏角与磁倾角具有正负异常高梯度带的特征, 这与张家口—渤海地震带构造分段性特征密切相关。 张家口—渤海地震带位于燕山块体与华北平原块体之间, 两者运动的平动速率之差是张家口—渤海地震带左旋走滑的直接动力来源, 而各断裂带左旋走滑速率之差很可能是岩石圈磁场空间变化分段性分布的主要原因。  相似文献   

黑龙江多宝山——大新屯地区铜金多金属成矿作用及找矿方向   总被引：1，自引：0，他引：1  

韩振哲  刘娜  公凡影  李永胜  李仰春  姚磊 《地质论评》2015,61(4):787-796

黑龙江省多宝山—大新屯地区,铜矿以中—晚加里东期多宝山式斑岩型、燕山早期三矿沟式矽卡岩型为主,晚古生界海底火山岩有关喷发—沉积型铜锌矿床,具优越的成矿潜力,不同时期、类型铜矿床在空间分布上明显受古生代海相火山岩—碳酸盐岩建造控制,并具有"上金下铜"的斑岩—热液型铜金矿成矿系统的特征。金矿以燕山晚期三道湾子式浅成低温热液型金成矿作用强烈为特点;持续时间由早石炭世—早—中侏罗世的韧性剪切—走滑作用、中侏罗世为主要伸展期的变质核杂岩有关的金成矿作用,以及奥陶纪浊积岩(卡林型)有关金成矿作用,以中—小规模金矿床(点)为主;金矿受北西向、北东向的火山构造、变质核杂岩构造和韧性剪切—走滑作用控制,显示出良好的金找矿前景;结合近期的铜金矿重大勘查进展和成果,总结成矿规律,梳理了制约着铜金多金属矿找矿突破的关键地质问题,提出找矿方向和今后勘查工作部署建议。  相似文献   

Reflections on the current state of global climate response     

Tom Jacob 《Climate Policy》2013,13(1):91-97

What is the significance of the 2007 United Nations Climate Change Conference in Bali? The formal outcomes, especially the ‘Bali Action Plan’, are described and commented on, along with the challenges for negotiating a post-2012 agreement in Copenhagen during 2008 and 2009. The article concludes that the outcome of the Bali meeting is insufficient when compared to the nature of the challenge posed by climate change. However, it can nevertheless be considered a success in terms of ‘Realpolitik’ in paving the way for the negotiations ahead, because some real changes have been discerned in the political landscape. The challenges for the road towards Copenhagen are manifold: the sheer volume and complexity of the issues and the far-reaching nature of decisions such as differentiation between non- Annex I countries pose significant challenges in themselves, while the dependency on the electoral process in the USA introduces a high element of risk into the whole process. The emergence of social justice as an issue turns climate policy into an endeavour to improve the world at large—thereby adding to the complexity. And, finally, the biggest challenge is the recognition that the climate problem requires a global solution, that Annex I and non-Annex I countries are mutually dependent on each other and that only cooperation regarding technology in combination with significant financial support will provide the chance to successfully tackle climate change.  相似文献   

Climate negotiations beyond Kyoto: developing countries concerns and interests     

《Climate Policy》2013,13(3):221-231

Abstract

Five years down the road from Kyoto, the Protocol that bears that city's name still awaits enough qualifying ratifications to come into force. While attention has been understandably focussed on the ratification process, it is time to begin thinking about the next steps for the global climate regime, particularly in terms of a deeper inclusion of developing countries' concerns and interests. This paper begins doing so from the perspective of the developing countries. The principal argument is that we need to return to the basic principles outlined in the Framework Convention on Climate Change in searching for a north—south bargain on climate change. Such a bargain may be achievable if we can realign the policy architecture of the climate regime to its original stated goals of sustainable development.  相似文献   

Economics of climate change: risk and responsibility by world region     

《Climate Policy》2013,13(3):298-316

The impacts of predicted climate change will not be distributed evenly around the world. As post-Kyoto negotiations unfold, relating the geographical distribution of projected impacts to responsibility for emissions among world regions is essential for achieving an equitable path forward. This article surveys the current knowledge of regional climate consequences, and delves into the regional predictions of economic assessment models to date, examining how the uncertainties, assumptions and ethical dimensions influence the portrayal of risk at this scale. The few studies that quantitatively compared regional risk and responsibility are reviewed, and the analytical framework from one such study is applied to the 2006 Stern Review's projections to give the first regional comparison to take purchasing power and welfare considerations into account. Synthesizing burden and blame in this way is informative for policy makers; the world's most vulnerable communities—in Africa, the Indian subcontinent, Latin America, and small island states—accounted for less than 33% of global greenhouse gas emissions over the period 1961–2000, but may experience more than 75% of the ensuing climate damages this century. This analysis reinforces the call for industrialized nations to lead mitigation efforts, and to do so decisively and swiftly.  相似文献   

Discovery of six high-redshift quasars with the Lijiang 2.4 m telescope and the Multiple Mirror Telescope     

Xue-Bing Wu  Wen-Wen Zuo  Qian Yang  Wei-Min Yi  Chen-Wei Yang  Wen-Juan Liu  Peng Jiang  Xin-Wen Shu  and Hong-Yan Zhou 《天文和天体物理学研究(英文版)》2012,(9):1185-1190

Quasars with redshifts greater than 4 are rare, and can be used to probe the structure and evolution of the early universe. Here we report the discovery of six new quasars with i-band magnitudes brighter than 19.5 and redshifts between 2.4 and 4.6 from spectroscopy with the Yunnan Faint Object Spectrograph and Camera (YFOSC) at the Lijiang 2.4 m telescope in February, 2012. These quasars are in the list of z > 3.6 quasar candidates selected by using our proposed J K/i Y criterion and the photometric redshift estimations from the SDSS optical and UKIDSS near-IR photometric data. Nine candidates were observed by YFOSC, and five among six new quasars were identified as z > 3.6 quasars. One of the other three objects was identified as a star and the other two were unidentified due to the lower signal-to-noise ratio of their spectra. This is the first time that z > 4 quasars have been discovered using a telescope in China. Thanks to the Chinese Telescope Access Program (TAP), the redshift of 4.6 for one of these quasars was confirmed by the Multiple Mirror Telescope (MMT) Red Channel spectroscopy. The continuum and emission line properties of these six quasars, as well as their central black hole masses and Eddington ratios, were obtained.  相似文献   

Periodicity in the most violent solar eruptions： recent observations of coronal mass ejections and flares revisited     

Peng-Xin Gao  Jing-Lan Xie  Hong-Fei Liang 《天体物理学报》2012,(3):322-330

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A numerical study of self-gravitating protoplanetary disks     

Kazem Faghei 《天体物理学报》2012,(3):331-344

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