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国土空间人地关系的概念与内涵辨析

地域研究与开发 2024年第4期43卷 1-8页

作者：赵鹏军刘正莹陈军北京大学深圳研究生院城市规划与设计学院广东深圳518055 北京大学城市与环境学院北京100871 国家基础地理信息中心北京100830

协调人地关系是可持续发展的内在要求,是世界各国空间规划编制与实施监测的重要内容,也是国土空间规划的基础科学问题。本研究解析了开展国土空间人地关系研究的必要性、现实性和紧迫性。基于对人地关系和国土空间的概念认知,提出了国... 详细信息

协调人地关系是可持续发展的内在要求,是世界各国空间规划编制与实施监测的重要内容,也是国土空间规划的基础科学问题。本研究解析了开展国土空间人地关系研究的必要性、现实性和紧迫性。基于对人地关系和国土空间的概念认知,提出了国土空间人地关系的概念。基于对国土空间规划业务的解析,从资源供需关系、资源资产赋权关系、开发保护关系、用途管制关系4个维度探讨了国土空间人地关系的内涵。国土空间人地关系既是人地关系地域系统理论的空间体现,又是面向人与自然和谐的人地关系调控的业务场景,国土空间人地关系的概念与内涵为国土空间规划提供了新的理论支撑。

关键词：国土空间人地关系资源供需关系资源资产赋权关系开发保护关系用途管制关系

新能源接入交直流混合微电网的设备调度方法研究

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自动化仪表 2024年第6期45卷 111-115页

作者：罗世刚刘正英李威武许青妥建军国网甘肃省电力公司发展事业部(经济技术研究院) 甘肃兰州730046

为解决现有交直流混合微电网设备调度效果不佳的问题,提出新能源接入交直流混合微电网的设备调度方法。首先,分析了交直流混合微电网在运行过程中的不确定因素。然后,以提升电网运行稳定性为目标,建立了微电网优化调度的目标函数;同时,... 详细信息

为解决现有交直流混合微电网设备调度效果不佳的问题,提出新能源接入交直流混合微电网的设备调度方法。首先,分析了交直流混合微电网在运行过程中的不确定因素。然后,以提升电网运行稳定性为目标,建立了微电网优化调度的目标函数;同时,通过对交直流侧功率平衡的等式约束和对分布式电源与蓄电池的不等式约束,构建了优化调度模型。最后,通过优化的烟花算法完成调度模型求解,在保证模型稳定性的同时实现交直流微电网设备的优化调度。试验结果表明:应用所提方法,微电网长期处于售电状态,且调度成本始终在15元以内。该方法可提升微电网运行的稳定性和经济性。

关键词：新能源微电网出力不确定性优化调度光伏出力交直流适应度

Development of a cell-permeable adenine-derived probe for capture of nucleotide-binding proteins in living cells

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Chinese Chemical Letters 2024年第3期35卷 243-246页

作者： Lihong liu Rui Chen Gang Xue Chenzhou Hao Weizhi Weng zhengying Pan State Key Laboratory of Chemical Oncogenomics School of Chemical Biology and BiotechnologyPeking University Shenzhen Graduate SchoolShenzhen 518055China

Adenine is an essential building block of genetic material and a range of *** probes containing an adenine moiety have been used in kinase profiling studies in cell *** we report that adenine-derived small-molecule probes with an activated ester reactive group can covalently modify a conserved lysine residue of protein kinases and capture a number of nucleotide-binding proteins within living cells.

关键词： Adenine-derived probe Cell-permeable Lysine residue Protein kinases Nucleotide-binding proteins

Construction of lightweight NiCo-LDH/carbon fiber nanocomposites for broad-band microwave absorption

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ChemPhysMater

ChemPhysMater 2024年第2期3卷 212-219页

作者： Shuangshuang liu zhengying Shen Beibei Zhao Nannan Wu School of Material Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

The rapidly increasing usage of electric technology during the last decades has facilitated the fabrication of high-efficiency microwave absorption(MA)materials(MAMs).In this study,hierarchical NiCo layered double hydroxide(LDH)/carbon fiber(CF)nanocomposites were constructed via simple hydrothermal production,and their MA properties were *** from interfacial polarization,defect-induced polarization,and multiple reflections induced by the hierarchical sheets,the LDH/CF composites delivered a better MA perfor-mance than that by pure CF and *** addition ratio of the LDH also played a vital role in determining the impedance matching and microwave absorption ***,the optimized LDH/CF composites demonstrated an exceptional reflection loss(RL)of-62.47 dB with a thickness of 2.22 mm,and an effective absorption bandwidth(EAB)covering 6.4 GHz(11.6-18.0 GHz)at a 20 wt.%filling ratio,which outperformed the reported CF-based microwave *** to this superior MA,the as-prepared LDH/CF composites demonstrated to be significantly promising for advancing the usage of CF-based MAMs.

关键词： Microwave absorption Nickel cobalt layered double hydroxides Carbon fiber Interface polarization

Planning for Health: Complexity of Environmental Health and Planning Responses

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China City Planning Review 2018年第1期27卷 32-40页

作者： liu zhengying Yang Dongfeng liu Jinxin Department of Urban Planning and Design Dalian University of Technology

China's rapid urbanization has led to increasing environmental health problems, which poses great challenges to urban sustainable development. In order to explore the scientific issue of planning for health, this paper firstly analyzes the challenges of spatial planning caused by environmental complexity in terms of health risk, environmental impact, and residents' behavior. And then it puts forward an analytic framework that includes three basic modules, i.e., theoretical model, regional health risk identification, and planning performance assessment, thereby finally proposing six spatial planning strategies according to the objectives of health protection, health promotion, and health equity, on the basis of the actual situation of health risk exposure, environmental friendliness, and the aging level in different cities of China.

关键词： environmental health complexity spatial planning

A novel approach in preparing polymer/nano-CaCO_(3) composites

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Frontiers of Chemical Science and Engineering 2008年第1期2卷 115-122页

作者： zhengying liu Runze YU Mingbo YANG Jianmin FENG Wei YANG Bo YIN College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China

An novel compounding process using nano-CaCO_(3) aqueous suspension for preparing polymer/nano-CaCO_(3) composites with nanoparticles dispersed at the nanoscale is *** process is called the mild mixing *** this method,the pre-dispersed nano-particle suspensions are blended with melting polymers in a weak shearing field using an extruder,followed by removing the water from the *** four typical poly-meric nanocomposites were prepared by mild mixing *** dispersion of nano-CaCO_(3) in the matrix of the polymer at the nanoscale was confirmed by scanning electron microscopy(SEM).The molecular weights of polycarbonate(PC)and its nanocomposite showed that the degradation had not occurred during the mild mixing *** mechanical properties of the composite with 1.5 wt-% nano-CaCO_(3) improve *** proved that this approach is suitable for the preparation of nano-composites based on both polar and non-polar polymers.

关键词： nanoparticles mild mixing polar and non-polar polymer dispersion

Frequency Regulation of VSC-MTDC System with Offshore Wind Farms

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 275-286页

作者： Haoyu liu Chongru liu North China Electric Power University Beijing 102206China

Frequency regulation of voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC)system with offshore wind farms enhances the frequency stability by compensating the power for a disturbed AC ***,it is difficult to reasonably allocate frequency-regulation resources due to a lack of coordination mechanisms between wind farms and the MTDC ***,it is difficult for the frequency control of the wind farms to manage changes in wind speed;and the risk of wind-turbine stalls is ***,based on the kinetic energy of wind turbines and the power margin of the converters,the frequency-regulation capability of wind turbines is evaluated,and a dynamic frequency-support scheme considering the real-time frequency-support capability of the wind turbines and system frequency evolution is proposed to improve the frequency-support performance.A power adaptation technique at variable wind speeds is developed;the active power in the frequency-support stage and restoration stage is switched according to the wind speed.A hierarchical zoning frequency-regulation scheme is designed to use the frequency-regulation resources of different links in the MTDC system with wind *** simulation results show that the novel frequency-regulation strategy maintains frequency stability with wind-speed changes and avoids multiple frequency dips.

关键词： Wind generation voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC) frequency regulation cooperative control adaptive control variable wind speed

民族史学研究的一条新路子——管彦波新著《中国西南民族社会生活史》评价

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黑龙江民族丛刊 2005年第6期 120-122页

作者：刘正寅中国社会科学院民族学与人类学研究所北京100081

本文认为,《中国西南民族社会生活史》的出版,不仅在民族史以及民族学、民俗学方面有着较重要的学术价值,而且也将有助于推动这一领域的深入研究。它的学术贡献主要有:系统地提出了“民族社会生活史”这一新的学科概念,翔实地考证了西... 详细信息

本文认为,《中国西南民族社会生活史》的出版,不仅在民族史以及民族学、民俗学方面有着较重要的学术价值,而且也将有助于推动这一领域的深入研究。它的学术贡献主要有:系统地提出了“民族社会生活史”这一新的学科概念,翔实地考证了西南民族衣食住行等社会生活的重要内容。

关键词：西南民族社会生活衣食住行

A Novel Design of a Pre-separation Panel Structure to Protect Against the Impact of an Explosion in an Aircraft Plenum Chamber

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Acta Mechanica Solida Sinica 2024年第1期37卷 166-180页

作者： Zongxing liu Xiang Yang Jun liu School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China COMAC Shanghai Aircraft Design and Research Institute Shanghai 201210China

To reduce the damage of the pressurizing panel structure of a fuselage caused by an explosion at the“least risk bomb location”in an aircraft structure,a new pre-separation panel structure was designed to resist blast ***,the dynamic strain response and morphology of impact damage of the new pre-separation panel were measured in an impact damage ***,the commercial software LS-DYNA was used to calculate the propagation of the blast shock wave,and the results were compared with empirical equations to verify the rationality of the numerical calculation ***,the fluid–structure coupling method was used to calculate the damage process of the pre-separation panel structure under the impact of an explosion wave and an impact *** calculated results were in good agreement with the test results,which showed the rationality of the calculation method and the *** residual strength of the damaged pre-separation panel was significantly higher than that of the original damaged *** results show that the new pre-separation panel structure is reasonable and has certain significance for guiding the design of plenum chambers with strong resistance to implosion for aircraft fuselages.

关键词： Pre-separation panel structure Explosive response Residual strength Aircraft plenum chamber Least risk bomb location