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国有资产改革对自然资源资产“两权”分离的启示与借鉴

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生态经济 2025年第1期41卷 195-200页

作者：林霖黄志豪康琴陈丹张敏王珂虞舟鲁中国计量大学人文与外语学院浙江杭州310018 浙江数治空间规划设计有限公司浙江杭州310030 浙江省测绘科学技术研究院浙江杭州310007 浙江大学环境与资源学院浙江杭州310058

我国国有资产管理体制经过了从统一到分散再到统一的改革历程。在此过程中,国务院设立国有资产监督管理委员会,并逐步推动国有资产管理方式从以管企业为主向以管资本为主转变,探索了国有资产所有权与监管权“两权”分离的路径。鉴于自... 详细信息

我国国有资产管理体制经过了从统一到分散再到统一的改革历程。在此过程中,国务院设立国有资产监督管理委员会,并逐步推动国有资产管理方式从以管企业为主向以管资本为主转变,探索了国有资产所有权与监管权“两权”分离的路径。鉴于自然资源资产管理与国有资产管理存在较强相似性,国有资产投资运营公司在促进国有资产“两权”分离中的关键作用,为自然资源资产所有权与监管权的分离提供了重要启示和借鉴。自然资源资产管理在完成委托代理机制试点后,建议管理方式由“资源管理”逐步转向“资产管理”,授权设立自然资源投资运营公司,以实现自然资源资产“两权”的有效分离,从“自然资源部门—自然资源资产”的二级管理体制转变为“自然资源部门—自然资源投资运营公司—自然资源资产”的三级管理体制,以期为推进自然资源资产的有效监管和资产增值提供改革思路与参考。

关键词：国有资产改革自然资源资产 “两权”分离投资运营公司

Buckling of composite cylindrical shells with ovality and thickness variation subjected to hydrostatic pressure

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Defence Technology（防务技术） 2022年第5期18卷 862-875页

作者： Zhun Li ke-chun Shen Xin-hu Zhang Guang Pan School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an710072China key Laboratory for Unmanned Underwater Vehicle Northwestern Polytechnical UniversityXi'an710072China Structural Ceramics and Composites Engineering Research Center Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China

The initial geometric imperfection is one of the primary factors affecting the buckling behaviors of composite cylindrical shells under hydrostatic *** this study,ovality and thickness variations as two representative types of the geometric imperfections are *** measuring the geometric imperfections,a typical carbon fiber reinforced polymers(CFRP)cylindrical shell is tested to obtain the buckling *** buckling behaviors of the shell sample are analyzed in combination with the strain *** using the nonlinear numerical analysis,the buckling shapes of the CFRP cylinder shells with different combinations of ovality and thickness variation are firstly *** rules of influence of such imperfections on the buckling pressure are then obtained by nonlinear regression ***,an empirical formula is proposed to predict the buckling pressure of the composite cylinder shells,and the calculated results from the formula are in good agreement with the numerical results.

关键词： Composite Cylindrical shell Buckling Hydrostatic pressure Imperfections

Fast-growing procedure for perovskite films in planar heterojunction perovskite solar cells

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Chinese Chemical Letters 2015年第12期26卷 1518-1521页

作者： Tang-Hao Liu ke Chen qin hu Jiang Wu De-Ying Luo Shuang Jia Rui Zhua Qi-huang Gong State key Laboratory for Artificial Microstructure and Mesoscopic Physics School of Physics Peking University International Center for Quantum Materials School of Physics Peking University Collaborative Innovation Center of Quantum Matter

A fast-growing procedure（FGP） to fabricate perovskite films with large grain sizes is described in this article. In the FGP method, the perovskite precursor solution is coated onto the substrates at a temperature of 240 8C. The solvent in the precursor solution evaporates quickly in about 2 s, resulting in the rapid formation of a perovskite film without further annealing process. Millimeter-scale perovskite grain clusters are obtained in the film. Based on such perovskite films, fabricated planar heterojunction perovskite solar cells give a power conversion efficiency（PCE） above 8%.

关键词： perovskite planar annealing coated fabricate sizes micrograph quickly evaporation PEDOT

Recent progress on multifunctional electromagnetic interference shielding polymer composites

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Journal of Materials Science & Technology 2023年第3期134卷 106-131页

作者： ke Tian Danrong hu Quan Wei Qiang Fu hua Deng College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China Rehabilitation Medicine Center and Institute of Rehabilitation Medicine Key Laboratory of Rehabilitation Medicine in Sichuan ProvinceWest China HospitalSichuan UniversityChengdu 610041China

The explosive development of electronic devices and wireless communication technology gives rise to the issue of electromagnetic pollution,known as electromagnetic interference(EMI).The accumulation of undesirable electromagnetic radiation in space disturbs the normal function of unshielded electronic appliances and poses seriously threat to human ***,the development of EMI shielding materials have emerged to solve the grim *** the complex application contexts,EMI shielding materials have evolved from traditional single-function to multi-functions to meet the ever-increasing application requirements in recent few *** paper provides detailed insight into the current re-search status and future challenges in the advancement of polymer-based EMI shielding materials with various ***,the basic theory of EMI shielding,factors influencing results and the dominating characterization technologies for EMI shielding properties are ***,the comprehensive descriptions of the seven types of multifunctional EMI shields are provided with respect to their structures,fabrication methods and specific ***,the corresponding critical scientific and technical issues are *** on our comprehensive analysis,the main challenges in the development of multifunctional EMI shielding materials are *** review aims to provide some guidance and inspire more efforts toward functional EMI shielding material research to satisfy the growing requirements for next-generation electronic systems.

关键词： Polymer-based composites Electromagnetic interference shielding Multiple losses Multifunctionality

Effect of sintering temperature on the microstructure and properties of foamed glass-ceramics prepared from high-titanium blast furnace slag and waste glass

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International Journal of Minerals,Metallurgy and Materials 2017年第8期24卷 931-936页

作者： Chang-hong Chen ke-qin Feng Yu Zhou Hong-ling Zhou School of Manufacturing Science and Engineering Sichuan University

Foamed glass-ceramics were prepared via a single-step sintering method using high-titanium blast furnace slag and waste glass as the main raw materials The influence of sintering temperature(900–1060℃) on the microstructure and properties of foamed glass-ceramics was studied. The results show that the crystal shape changed from grainy to rod-shaped and finally turned to multiple shapes as the sintering temperature was increased from 900 to 1060℃. With increasing sintering temperature, the average pore size of the foamed glass-ceramics increased and subsequently decreased. By contrast, the compressive strength and the bulk density decreased and subsequently increased. An excessively high temperature, however, induced the coalescence of pores and decreased the compressive strength. The optimal properties, including the highest compressive strength(16.64 MPa) among the investigated samples and a relatively low bulk density(0.83 g/cm^3), were attained in the case of the foamed glass-ceramics sintered at 1000℃.

关键词： foamed glass-ceramics sintering temperature blast furnace slag waste glass crystallization

Co-controlling CO2 and NOx emission in China's cement industry:An optimal development pathway study

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Advances in Climate Change Research 2018年第1期9卷 34-42页

作者： FENG Xiang-Zhao Oleg LUGOVOY qin hu Policy Research Centre for Environment and Economy of the Ministry of Environmental Protection Beijing 100029China Environmental Defense Fund Washington DC 20009USA Environmental Defense Fund Beijing 100007China

It is of important practical significance to reduce NOx emission and CO2 emission in China's cement *** paper firstly identifies key factors that influence China's future cement demand,and then uses the Gompertz model to project China's future cement demand and ***,the multi-pollutant abatement planning model(MAP)was developed based on the TIMES model to analyze the co-benefits of CO2 and NOx control in China's cement *** modeling analysis,three scenarios such as basic as usual scenario(BAU),moderately low carbon scenario(MLC),and radically low carbon scenario(RLC),were built according to different policy constraints and emission control ***,the benefits of co-controlling NOx and CO2 emission in China's cement industry have been ***,this paper proposes a cost-efficient,green,and low carbon development roadmap for the Chinese cement sector,and puts forwards countermeasures as follows:first,different ministries should enhance communication and coordination about how to promote the co-control of NOx and CO2 in cement ***,co-control technology list should be issued timely for cement industry,and the R&D investment on new technologies and demonstration projects should be ***,the phase-out of old cement capacity needs to be continued at policy ***,it is important to scientifically evaluate the relevant environmental impact and adverse motivation of ammonia production by NOx removal requirement in cement industry.

关键词： Cement industry CO2 abatement NOx reduction Co-benefit analysis

Semi-valid Fuzz Testing Case Generation for Stateful Network Protocol

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Tsinghua Science and Technology 2017年第5期22卷 458-468页

作者： Rui Ma Shuaimin Ren ke Ma Changzhen hu Jingfeng Xue the Beiiing key Laboratory of Software Security Engineering Technology School of SoftwareBeijing Institute of TechnologyBering 100081China the Internet Center Institute of Communication Standard Research.China Academy of Information and Communication TechnologyBering 100191China

Network protocols are divided into stateless and stateful. Stateful network protocols have complex communication interactions and state transitions. However, the existing network protocol fuzzing does not support state transitions very well. This paper focuses on this issue and proposes the Semi-valid Fuzzing for the Stateful Network Protocol （SFSNP）. The SFSNP analyzes protocol interactions and builds an extended finite state machine with a path marker for the network protocol; then it obtains test sequences of the extended finite state machine, and further performs the mutation operation using the semi-valid algorithm for each state transition in the test sequences; finally, it obtains fuzzing sequences. Moreover, because different test sequences may have the same state transitions, the SFSNP uses the state transition marking algorithm to reduce redundant test cases. By using the stateful rule tree of the protocol, the SFSNP extracts the constraints in the protocol specifications to construct semi-valid fuzz testing cases within the sub-protocol domain, and finally forms fuzzing sequences. Experimental results indicate that the SFSNP is reasonably effective at reducing the quantity of generated test cases and improving the quality of fuzz testing cases. The SFSNP can reduce redundancy and shorten testing time.

关键词： network protocol fuzzing extended finite state machine test sequence state transition markingalgorithm semi-valid algorithm

Epigenetic control on cell fate choice in neural stem cells

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Protein & Cell 2012年第4期3卷 278-290页

作者： Xiao-Ling hu Yuping Wang qin Shen Center for Stem Cell Biology and Regenerative Medicine School of MedicineTsinghua Center for Life SciencesTsinghua UniversityBeijing 100084China Department of Pharmacy Tianjin Children’s HospitalTianjin 300074China

Derived from neural stem cells(NSCs)and progenitor cells originated from the neuroectoderm,the nervous system presents an unprecedented degree of cellular diversity,interwoven to ensure correct connections for propagating information and responding to environ-mental *** and progenitor cells must integrate cell-intrinsic programs and environmental cues to achieve production of appropriate types of neurons and glia at appropriate times and places during *** developmental dynamics are reflected in changes in gene expression,which is regulated by transcription factors and at the epigenetic *** early commitment of neural lineage to functional plas-ticity in terminal differentiated neurons,epigenetic regulation is involved in every step of neural *** we focus on the recent advance in our un-derstanding of epigenetic regulation on orderly genera-tion of diverse neural cell types in the mammalian nervous system,an important aspect of neural devel-opment and regenerative medicine.

关键词： neural stem cells(NSCs) epigenetic regu-lation neurogenesis gliogenesis radial glial cell cerebral cortex subventricular zone(SVZ) DNA methylation histone modification

Universal precursor seismicity pattern before locked-segment rupture and evolutionary rule for landmark earthquakes

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Geoscience Frontiers 2022年第3期13卷 22-34页

作者： Hongran Chen Siqing qin Lei Xue Baicun Yang ke Zhang key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesChina Innovation Academy for Earth Science CASChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesChina School of Resources and Civil Engineering Northeastern UniversityChina

Despite extensive investigations,no precursor patterns for reliably predicting major earthquakes have thus far been *** locked segments that can accumulate adequate strain energy to cause major earthquakes are highly heterogeneous and low *** progressive cracking of the locked segments with these properties can produce an interesting seismic phenomenon:a landmark earthquake and a sequence of smaller subsequent earthquakes(pre-shocks)always arise prior to another landmark earthquake within a well-defined seismic zone and its current seismic *** a mechanical model,magnitude constraint conditions,and case study data of 62 worldwide seismic zones,we show that two adjacent landmark earthquakes reliably occur at the volume-expansion point and peak-stress point(rupture)of a locked segment;thus,the former is an identified precursor for the *** a precursor seismicity pattern before the locked-segment rupture has definite physical meanings,and it is universal regardless of the focal *** the evolution of landmark earthquakes follows a deterministic rule described by the model,they are *** results of this study lay a firm physical foundation for reliably predicting the occurrence of future landmark earthquakes in a seismic zone and can greatly improve our understanding of earthquake generation mechanism.

关键词： Precursor Locked segment Volume-expansion point Peak-stress point Landmark earthquake