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Adsorption properties of environmentally friendly insulating medium C_(4)F_(7)N and its common decomposition products in NaA,NaZSM-5,and NaX molecular sieves

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High Voltage 2023年第3期8卷 611-621页

作者： Shuangshuang Tian Zian Yuan Xiaoxing Zhang Yingxiang Wang Weifeng Luo Yang Liu Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment Hubei University of TechnologyWuhanChina Xiangyang Industrial Institute of Hubei University of Technology WuhanChina State Grid HBEPC.Ltd Economic and Technology Research Institute WuhanHubeiChina State Grid Hubei Extra High Voltage Company WuhanChina

Selecting suitable materials to adsorb the C_(4)F_(7)N mixtures decomposition products could not only keep the stable operation of the environmentally friendly insulating gas switch cabinet,but also ensure the safety of operation and maintenance personnel.It is necessary to study the interaction of three types of molecular sieves with the C_(4)F_(7)N mixture and its decomposition products,which could provide a theoretical basis for the selection of adsorbents in the C_(4)F_(7)N gas switch cabinet.In this research,the molecular dynamics simulation was used to study the C_(4)F_(7)N-CO_(2)mixture and its ten kinds of decomposition products CO,CF_(4),C_(2)F_(6),C_(3)F_(6),C_(3)F_(8),CF_(3)H,CF_(3)CN,C_(2)F_(5)CN,C_(2)N_(2),and COF_(2)in three molecular sieves adsorption process(NaA,NaZSM-5,and NaX).The gas concentration distribution curve and interaction energy parameters were obtained by simulation.The interaction energies of C_(3)F_(8)in NaA,C_(4)F_(7)N in NaZSM-5,and C_(3)F_(6)in NaX molecular sieve are the largest,which are−368.35 kJ/mol,−174.93 kJ/mol,and−340.09 kJ/mol respectively.Then,the theoretical results were verified by the fluorocarbon gases adsorption experiment.The adsorption performance of three molecular sieves for all gases was obtained by combining the experimental results and dynamics parameters.The adsorption rate of the NaA molecular sieve for fluorocarbon gas is less than 35%,and its adsorption performance for all gases is weak.NaZSM-5 and NaX molecular sieves show excellent adsorption performance for C_(3)F_(6)and C_(3)F_(8),and the adsorption rates are over 70%.NaZSM-5 molecular sieve shows good adsorption capacity for CF_(3)CN,C_(2)F_(6),C_(2)N_(2),C_(3)F_(6),C_(3)F_(8),C_(4)F_(7)N,and C_(2)F_(5)CN.NaX molecular sieve shows good adsorption capacity for C_(3)F_(6),C_(3)F_(8),C_(4)F_(7)N,and C_(2)F_(5)CN.Both of them have the potential to be used as adsorbents in environmental protection insulated gas switch cabinet.

关键词： sieve adsorption gases

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Climate change and food security:Plant science roles

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Molecular Plant 2023年第10期16卷 1481-1483页

作者： Lexuan Gao Xiaofeng Cui On behalf of the editorial team Molecular Plant

In a broad sense,climate change is a long-term shift in global or regional climate patterns on Earth,which can be driven by both natural dynamics such as solar cycles or volcanic eruptions and human activities.However,it has been shown that deforestation since the dawn of Industrial Revolution,combined with the persistent emission of greenhouse gases(e.g.,CO_(2)and methane,which trap the Sun's heat)from intense agricultural and industrial activities,are the primary drivers of climate change over the past two centuries(Ritchie,2020;Lynas et al.,2021).

关键词： Plant Earth gases

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Research on a prediction model for gas insulation performance based on Pareto optimisation

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High Voltage 2022年第6期7卷 1080-1090页

作者： Tianpeng You Xuzhu Dong Wenjun Zhou Yu Zheng Hongyu Lei Shubo Ren Han Li Hua Hou School of Electrical Engineering and Automation Wuhan UniversityWuhanHubeiChina College of Chemistry and Molecular Sciences Wuhan UniversityWuhanHubeiChina

Predicting the insulation performance of SF_(6)substitute gases through gas molecular structures has been a popular topic worldwide.The difficulty is that the relationships between the molecular structure and the gas insulation strength,global warming potential and boiling temperature are not clear,and general linear methods cannot be used to effectively extract the key factors.Based on published molecular structure parameters,the grey correlation method is used to extract the factors that affect the gas dielectric strength,global warming potential and boiling temperature in a dynamic(non-linear)approach.Further,to predict the dielectric strength,global warming potential and boiling temperature of gases,a linear regression method and the factors with high correlations are used as independent variables.Through the Pareto optimal solution,the dielectric strength is set as the target,the global warming potential and boiling temperature are set as the constraints,and the ranges of the molecular structure parameters of the SF_(6)substitute gas are obtained.This research study provides an important reference regarding the SF_(6)substitute gas analysis and provides a research foundation for the design and synthesis of new environmentally friendly gases used in power equipment.

关键词： strength insulation gases

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How Many Pathways We Have for the Marine Carbon Neutrality

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地球科学学刊:英文版 2023年第5期34卷 1621-1623页

作者： Jun Sun Institute for Advanced Marine Research CUG Guangzhou 511462China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430078China College of Marine Science and Technology China University of GeosciencesWuhan 430074China

Global warming is one of the major challenges that the international community is currently facing.The Intergovernmental Panel on Climate Change(IPCC)has indicated that if the concentration of greenhouse gases in the atmosphere continues to rise,global warming is expected to pose risks to future food security,as well as to human health and wealth in the 21st century.China became the world’s largest emitter of greenhouse gases in 2006.In 2018,the global emission of greenhouse gases was 33.1 billion metric tons of CO_(2),with China accounting for 28%of the total global emission,ranking first globally.According to estimates by the Chinese Academy of Engineering,China will reach its peak carbon dioxide emissions in 2027 at 12.2 billion metric tons of CO_(2),making it imperative to achieve carbon neutrality and achieve harmony between humans and nature as soon as possible.

关键词： gases Marine harmony

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Guest Editorial:Special Section on Control Centers for the Evolving Power Grid:Architecture and Applications

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Journal of Modern Power Systems and Clean Energy 2022年第2期10卷 I0001-I0002页

作者： Anjan Bose Patrick Panciatici Xin Shan Washington State University PullmanUSA RTE ParisFrance NARI Group Corporation(State Grid Electric Power Research Institute) NanjingChina

THE world-wide drive to decrease greenhouse gases in the atmosphere is rapidly changing the mix of fuel resources that are used to generate electricity.The percentage of fossil fuels,especially coal,is declining while the percentage of renewable resources,like wind and solar,is increasing.The generation mix has always depended on the avail-ability of different fuels in different regions,like the availability of hydro or the acceptability of nuclear power,and the recent changes also depend on this geography,like the radiance of the sun or the intensity of the wind.Although these changes will lead to different architectures in the evolving power grid,some trends are already being felt.

关键词： Power gases fuels

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A UNIFIED VISCOSITY MODEL FOR HYDROCARBON gases AND LIQUIDS BASED ON TRANSPoSED PATEL-TEJA EQUATION OF STATE

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Chinese Journal of Chemical Engineering 1991年第1期 38-49页

作者：王利生郭天民 Beijing Graduate School University of PetroleumBeijing

A unified model for predicting high-pressure viscosities of both hydrocarbon gases and liquids was developed,which is based on the similarity between P-V-T and T-μ-P plots and Patel-Teja equation of state.The characteristic feature of this new model is its capability of describing the continuous variation of fluid viscosity throughciritical region.The pure component parameters are generalized into functions of reduced temperature,reducedpressure,acentric factor and molecular weight.The overall average absolute deviation of predicted viscositiesof 20 pure hydrocarbon fluids(a total of 1941 data points)is 8.7%.

关键词： hydrocarbon deviation gases predicting reservoir similarity viscosity saturated unified liquids

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Frontiers in Coal-related Resources——introduction to the special issue

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Frontiers of Earth Science 2023年第1期17卷 1-3页

作者： Dameng LIU Shen JIAN Hongfei CHENG Yidong CAI Guangyao SI School of Energy Resource China University of GeosciencesBeijing 100083China Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process(Ministry of Education) China University of Mining and TechnologyXuzhou 221008China School of Earth Science and Resources Chang’an UniversityXi’an 710054China School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW 2052Australia

Coal-related resources, as a popular development in recent years, is the focus of research in the field of coalbed methane (CBM), coal measure gases, coal-associated rare earth resources and nonmetallic minerals (Moore, 2012;Dai and Finkelman, 2018;Qin et al., 2018). Due to its complexity in concentration, occurrence and exploitation, many key issues need to be addressed (Sayed et al., 2017;Bera et al., 2022;Liu et al., 2022).

关键词： minerals coalbed gases

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Umamification of food facilitates the green transition

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Soil Ecology Letters 2023年第1期5卷 1-3页

作者： Ole G.Mouritsen Department of Food Science Taste forLifeDesign and Consumer BehaviorUniversity of Copenhagen26 RolighedsvejDK-1958 FrederiksbergDenmark

The planet is facing a global climate crisis.Measures have urgently to be taken to alleviate the consequences by diminishing emission of greenhouse gases,cutting fossil energy consumption,and implementing sustainable uses of the world's resources.Being responsible for more than one third of the stressors on the climate,the global food production systems and our eating behavior must change dramatically(Vermeulen et al.,2012).

关键词： planet consequences gases

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Experimental Realization of Degenerate Fermi gases of 87Sr Atoms with 10 or Two Spin Components

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Chinese Physics Letters 2019年第9期36卷 18-22页

作者：祁卫梁明诚张涵魏玉栋王文伟王旭杰张熙博 International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871 Collaborative Innovation Center of Quantum Matter Beijing 100871 Beijing Academy of Quantum Information Sciences Beijing 100193

We report the experimental realization of quantum degenerate Fermi gases of87Sr atoms under controlled 10-and dual-nuclear-spin configurations.Based on laser cooling and evaporative cooling,we achieve an ultracold Fermi gas of 105 atoms equally distributed over 10 spin states,with a temperature of T/TF = 0.21.We further prepare a dual-spin gas by optically pumping atoms to the mF = 9/2 and mF = 7/2 states and observe a slightly lower T/TF than that for a 10-spin gas under the same trapping condition,showing efficient evaporative cooling under a decreasing number N of spin states(N≥2)despite the increasing importance of Pauli exclusion.Given that rethermalization becomes less efficient with N approaching unity,we evaporatively cool an almost polarized gas to 130 nK.The simple and efficient preparation of ultracold Fermi gases of 87Sr with tunable spin configurations provides a first step towards engineering topological quantum systems.

关键词： red Dirac pro Sr Atoms with 10 or Two Spin Components Experimental Realization of Degenerate Fermi gases of

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Enhanced spin-dependent thermopower in a double-quantum-dot sandwiched between two-dimensional electron gases

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Chinese Physics B 2019年第10期28卷 523-530页

作者：迟锋付振国刘黎明张平 School of Electronic and Information Engineering University of Electronic Science and Technology of ChinaZhongshan InstituteZhongshan 528400China Institute of Applied Physics and Computational Mathematics Beijing 100088China

We study the spin-dependent thermopower in a double-quantum-dot(DQD) embedded between the left and right two-dimensional electron gases(2DEGs) in doped quantum wells under an in-plane magnetic field. When the separation between the DQD is smaller than the Fermi wavelength in the 2DEGs, the asymmetry in the dots' energy levels leads to pronounced quantum interference effects characterized by the Dicke line-shape of the conductance, which are sensitive to the properties of the 2DEGs. The magnitude of the thermopower, which denotes the generated voltage in response to an infinitesimal temperature difference between the two 2DEGs under vanishing charge current, will be obviously enhanced by the Dicke effect. The application of the in-plane magnetic field results in the polarization of the spin-up and spin-down conductances and thermopowers, and enables an efficient spin-filter device in addition to a tunable pure spin thermopower in the absence of its charge counterpart.

关键词： quantum dot spin-dependent thermopower two-dimensional electron gases

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