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Hydrocarbon generation characteristics and exploration prospects of Proterozoic source rocks in China

Science China Earth Sciences 2019年第6期62卷 909-934页

作者： Wenzhi ZHAO Xiaomei wang Suyun HU Shuichang ZHANG Huajian wang Shuwei GUAN Yuntao YE Rong REN Tongshan wang Research Institute of Petroleum Exploration & Development PetroChina

A large number of primary oil and gas reservoirs have been discovered in Proterozoic strata all over the *** sequences are widely distributed in China, and the discovery of large Sinian-aged gas reservoirs in the Sichuan Basin and Mesoproterozoic liquid oil seepages in North China shows that attention should be paid to the exploration potential of Proterozoic strata. In this paper, the main controlling factors of Proterozoic source rocks are discussed. Principally, active atmospheric circulation and astronomical cycles may have driven intense upwelling and runoff to provide nutrients; oxygenated oceanic surface waters could have provided suitable environments for the organisms to thrive; volcanic activity and terrestrial weathering caused by continental break-up would have injected large amounts of nutrients into the ocean, leading to persistent blooms of marine organisms; and extensive anoxic deep waters may have created ideal conditions for the preservation of organic matter. Additionally, the appearance of eukaryotes resulted in diversified hydrocarbon parent material, which effectively improved the generation potential for oil and gas. Through the comparison of Formations across different cratons, seven sets of Proterozoic organic-rich source rocks have been recognized in China, which mainly developed during interglacial periods and are also comparable worldwide. The Hongshuizhuang and Xiamaling Formations in North China have already been identified previously as Mesoproterozoic source rocks. The early Proterozoic Changchengian System is highly promising as a potential source rock in the Ordos Basin. In the Upper Yangtze area, the Neoproterozoic Datangpo and Doushantuo Formations are extensively distributed, and represent the major source rocks for Sinian gas reservoirs in the Sichuan Basin. Moreover, the Nanhuan System may contain abundant shales with high organic matter contents in the Tarim Basin, although this possibility still needs to be veri

关键词： Proterozoic Source rocks Hydrocarbon generation characteristics Replacement field

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Recent progress of flexible aqueous multivalent ion batteries

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Carbon Energy 2022年第3期4卷 411-445页

作者： Zhenya wang Yanmei Li Jiawei wang Runa Ji Hao Yuan Yingyu wang Hua wang School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijingChina School of Materials Science and Engineering University of Science and Technology BeijingBeijingChina School of Chemistry Engineering Northeast Electric Power UniversityJilinChina

Flexible aqueous batteries have been thriving with the growing demand for wearable and portable electrical *** particular,flexible aqueous mul tivalent ion batteries(FAMIBs),the charge carriers of which include Zn^(2+),Al^(3+),Mg^(2+),and Ca^(2+),have great potential for development owing to their high safety,high elemental abundance in the Earth's crust,and a multi-electron redox mechanism with a high theoretical specific ***,for a comprehensive understanding of this developing field,it is necessary to summarize the recent research progress of FAMIBs in a timely ***,the advancements of the state-of-the-art FAMIBs are reviewed,and the prospects toward this field are also *** study focuses on the rational material and configuration design for FAMIBs in recent studies to achieve high battery performances under deformation conditions,which is elaborated on by classification of the anode,cathode,hydrogel electrolyte,and configurations of ***,the electrochemical performance of FAMIBs under flexible conditions is also reviewed from the perspective of their working voltage,specific capacity,and cycling ***,the ap proaches to improve the performance of FAMIBs are comprehensively eval uated,followed by the outlook on the challenges and opportunities in future development of FAMIBs.

关键词： aqueous battery flexible battery hydrogel electrolyte multivalent ion zinc ion battery

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Convergence rates of symmetric scan Gibbs sampler

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Frontiers of Mathematics in China 2019年第5期14卷 941-955页

作者： Neng-Yi wang School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan 430074China

We consider the symmetric scan Gibbs sampler,and give some explicit estimates of convergence rates on the Wasserstein distance for this Markov chain Monte Carlo under the Dobrushin uniqueness condition.

关键词： Markov chain Monte Carlo symmetric scan Gibbs sampler coupling method Wasserstein metric

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The Affine Complete Hypersurfaces of Constant Gauss-Kronecker Curvature

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Acta Mathematica Sinica,English Series 2009年第8期25卷 1353-1362页

作者： Bao Fu wang Department of Mathematics Sichuan University Chengdu 610064 P. R. China

Given a bounded convex domain Ω with C∞ boundary and a function ψ∈C∞（δΩ）, Li-Simon-Chen can construct an Euclidean complete and W-complete convex hypersurface M with constant affine Gauss-Kronecker curvature,... 详细信息

关键词： Gauss-Kronecker curvature affine completeness

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Ultrahigh tensile strength achieved in a lightweight medium Mn steel via prominent work hardening

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Journal of Materials Science & Technology 2023年第14期145卷 156-164页

作者： Bin Hu Guohui Shen Zheng wang Shilei Li Yandong wang Haiwen Luo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

We develop a new ultrastrong medium Mn steel with a density reduced to 7.39 g cm^(-3).It has a novel tri-phase microstructure comprising a hierarchical martensitic matrix(α’),dispersed ultra-fine-retained austenite grains(γ),and both compressed and{200}orientedδ-ferrite lamellas,the latter’s formation is due to the alloying of high Al and Si contents for reducing *** a result,both ultrahigh ultimate tensile strength of 2.1 GPa and good ductility of 16%are achieved after an extraordinary plastic strain hardening increment of about 1.4 *** in-situ synchrotron-based high-energy(HE)X-ray diffraction(XRD)examinations during the tensile deformation revealed that the initial presence of residual com-pressive stress inδ-ferrite could increase the stress required to initiate the plastic tensile deformation of the specimen,leading to the isolatedδ-ferrite lamellas mostly deformed elastically to coordinate the plastic deformation of the martensitic matrix during *** the plastic deformation,the gradual release of residual compressive stress inδandα’,the dislocation multiplication in all the three phases and the successiveγ-to-α’transformation all contribute to such a prominent work hardening *** study facilitates the development of novel strategies for fabricating ultrastrong but light steels.

关键词： Medium mn steels Low density △-ferrite Strain hardening Transformation induced plasticity

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Variations of extreme temperature in the Mount Qomolangma region in China during 1971-2020

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Journal of Mountain Science 2023年第12期20卷 3488-3499页

作者： wang Shun-jiu Sichuan Provincial Climate Centre Chengdu 610072China Institute of Plateau Meteorological China Meteorological AdministrationChengdu 610072China Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province Chengdu 610072China

According to observational daily temperature data from the meteorological stations during 1971-2020,the variations of the extreme temperature event in the Mount Qomolangma(also known as Mount Everest) region in China have been analyzed using statistical *** extreme temperature indices recommended by the World Meteorological Organization are selected to describe the extreme temperature *** RClimDEX 1.0 software is used to calculate the extreme temperature *** are no tropical nights,and just three summer days at the last 50 *** frost days are the main extreme temperature events all year *** temperature in the north slope is more extreme than that in the south slope of the Mount *** is remarkable decadal variation for the extreme temperature indices except diurnal temperature *** are the warm extremes increasing,however,the cold extremes decreasing with the decadal lapse,which is more remarkable into the 21^(th) *** tendencies for the extreme temperature indices in the north slope are consistent with those in the south *** are statistically significant trends for most extreme temperature indices during the study *** shows that the warm extremes would be more prominent in the future with the global continued *** abrupt changes of the extreme temperature index have occurred mainly in the 20^(th) century especially from the mid to late 1980s and *** periodic changes in the south slope do not synchronize those in the north slope for the most extreme temperature *** is different for most extreme temperature indices between the south and north slope,which has demonstrated that the regional or local changes are not neglectable for extreme temperature *** results of this study are also the consistent response of extreme temperature event to the global warming.

关键词： Extreme temperature Variation Trend Statistical analysis Mount Qomolangma Mount Everest

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A priori Estimates and Existence for a Class of Fully Nonlinear Elliptic Equations in Conformal Geometry

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Chinese Annals of Mathematics,Series B 2006年第2期27卷 169-178页

作者： Xu-Jia wang Dedicated to the memory of Shiing-Shen Chern

In this paper we prove the interior gradient and second derivative estimates for a class of fully nonlinear elliptic equations determined by symmetric functions of eigenvalues of the Ricci or Schouten tensors. As an application we prove the existence of solutions to the equations *** the manifold is locally conformally flat or the Ricci curvature is positive.

关键词： Conformal geometry Elliptic equation Ricci curvature

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Stipulation of the criteria for the construction of eco agricultural county in China

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Journal of Environmental Sciences 2000年第2期12卷 29-35页

作者： wang, Hong-Kang Department of Eco-Agricultural and Environmental Sciences China Agricultural University Beijing 100094 China

The criteria for the construction of an eco agricultural county in China were suggested. The criteria should coordinate social, economic, and environmental effects together. At first, it emphasizes on the social effect input into the system, which includes population control, cultural, scientific, and moral education, technical training and so on. Secondly, economic criteria are mainly those of the increase of gross national product(GNP) and income per capita every year. Finally, the technical criteria consist of not only the grain yield, commodity percentage of the agricultural product, cultivated output/input, animal husbandry production value/total agricultural production value and other agricultural criteria, but also environmental criteria, such as the percentage of forest and grass cover, degenerated land under control, recycling of organic waste, recommended fertilization, integrated pest management, treatment of discharged wastes and others. In an eco agricultural system, the realization of these criteria by three different development steps were recommended too.

关键词： criteria of eco agriculture indicator system of eco agriculture eco agricultural indexes for assessment CLC number: X22 Document code: A

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Binomial Proportion Estimation in Longitudinal Data with Non-ignorable Non-response

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Acta Mathematicae Applicatae Sinica 2013年第3期29卷 623-630页

作者： Xue-li wang School of Science Beijing University of Posts and Telecommunications

Non-random missing data poses serious problems in longitudinal studies. The binomial distribution parameter becomes to be unidentifiable without any other auxiliary information or assumption when it suffers from ignorable missing data. Existing methods are mostly based on the log-linear regression model. In this article, a model is proposed for longitudinal data with non-ignorable non-response. It is considered to use the pre-test baseline data to improve the identifiability of the post-test parameter. Furthermore, we derive the identified estimation （IE）, the maximum likelihood estimation （MLE） and its associated variance for the post-test parameter. The simulation study based on the model of this paper shows that the proposed approach gives promising results.

关键词： Binomial proportion information matrix identifiability non-ignorable non-response variance estimation

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Structure and electrical properties of polysilicon films doped with ammonium tetraborate tetrahydrate

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Journal of Semiconductors 2024年第10期45卷 60-68页

作者： Yehua Tang Yuchao wang Chunlan Zhou Ke-Fan wang Electrical and Energy Engineering Department Nantong Institute of TechnologyNantong 226000China Ningxia Research Center of Silicon Target and Silicon-Carbon Negative Materials Engineering Technology School of Materials Science and EngineeringNorth Minzu UniversityYinchuan 750021China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100049China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Henan Key Laboratory of Quantum Materials and Quantum Energy School of Future TechnologyHenan UniversityKaifeng 475004China

Here,p-type polysilicon films are fabricated by ex-situ doping method with ammonium tetraborate tetrahydrate(ATT)as the boron source,named *** effects of ATT on the properties of polysilicon films are comprehensively *** Raman spectra reveal that the ATT-pPoly film is composed of grain boundary and crystalline *** preferred orientation is the(111)*** grain size increases from 16−23 nm to 21−47 nm,by~70%on *** with other reported films,Hall measurements reveal that the ATT-pPoly film has a higher carrier concentration(>10^(20)cm^(−3))and higher carrier mobility(>30 cm2/(V·s)).The superior properties of the ATT-pPoly film are attributed to the heavy doping and improved grain *** doping property is proved by the mean sheet resistance(Rsheet,m)and distribution *** R_(sheet,m)decreases by more than 30%,and it can be further decreased by 90%if the annealing temperature or duration is *** boron concentration of ATT-pPoly film annealed at 950℃ for 45 min is~3×10^(20)cm^(−3),and the distribution is nearly the same,except near the ***,the standard deviation coefficient(σ)of Rsheet,m is less than 5.0%,which verifies the excellent uniformity of ATT-pPoly film.

关键词： polysilicon film boron doping ammonium tetraborate tetrahydrate(ATT) electrical properties crystallization

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