National Science Library,Chinese Academy of Sciences
Not a member yet
10241 research outputs found
Sort by
Organic matter heterogeneity and shale oil significance in Triassic Zhangjiatan shale,Ordos Basin, China
No full text
Organic matter heterogeneity exerts an important impact on the generation, evaluation, and exploitation of shale oil resources. In the past, only a limited number of analytical samples that represented the contribution or influence of high or low organic matter abundance intervals were used to represent an entire set of thick source rocks, and based on this limitation, occasionally researchers have reached incorrect conclusions. Here, the heterogeneity of organic matter and its significance to shale oil in the Triassic Zhangjiatan shale of the Ordos Basin were discussed based on sedimentary and geochemical analyses. Our results indicate that (1) the Chang 7(3) shale within the study area is characterized by high abundance, good quality, strong heterogeneity, and segmented enrichment in the vertical profile. The primary organic matter type was type II1, and this was followed by types I, II2, and III that exhibited three changing trends in the vertical profile. Organic matter maturity is primarily at the immature stage. (2) Additionally, we observed that the organic matter heterogeneity of Chang 7(3) shale was related to changes in lithology, sedimentary environment, paleoproductivity, terrigenous influence, and event action (such as volcanism and hydrothermal processes). The abundance of organic matter is the result of the coupling control of these processes. In the process of organic matter deposition, if volcano or hydrothermal activities occurred, the organic matter was abnormally enriched, and the total organic carbon content exceeded 20% and could even be as high as 40%. (3) Finally, we observed at least nine enrichment layers that were controlled by the coupling of different geological factors, and there were four potential target resource layers corresponding to the hydrothermal sedimentary area.
</div
Characteristics and trends of household carbon emissions research from 1993 to 2019 A bibliometric analysis and its implications
No full textThe study of household carbon emissions (HCEs) has become one of the most important topics in sustainability research due to the growing awareness of its significances in responding to global warming. This paper aims to identify the trends and characteristics of HCEs research for the period 1993-2019 through the bibliometric analysis approach. The impacts of most productive journals, countries, institutions and authors are evaluated by citation analysis, while the co-authorship network between various countries, institutions as well as the co-occurrence among different keywords are presented. The results of this paper provide a detailed picture on HCEs-related articles from 1993 to 2019. Both the number of publications on HCEs and the cooperation among countries and institutions have increased during the period. Keyword analysis suggests that the revelation of current status of HCEs and corresponding influencing factors are the main lines of HCEs research, and the prediction of HCEs should become the focus of future research. The valuable results obtained from this study can help the academic professionals keep informed of the latest developments in the HCEs-related field.</p
面向科技文献的多维语义索引构建思路及实现
No full text［目的/意义］文章从科技文献检索应用的背景出发，提出了目前检索系统未能满足广大科研工作者的语义检索需求，为了解决这一问题，提出了多维语义索引的新思路。［方法/过程］ 首先在总结归纳国内外相关研究中主要的语义索引构建方法的基础上得出了要采用的构建方法，然后详细介绍了多维语义索引的设计思路和整体框架，最后以面向物理领域科技文献为例，介绍了其具体实现流程。 ［结果/结论］ 从如何针对科技文献内部细粒度知识及其之间的关联关系揭示的角度验证了多维语义索引在语义检索实际应用中的良好效果。</p
