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Petroleum Science 2018年第3期15卷 644-656页

作者： Jie-Hui Yuan Sheng Zhou Tian-Duo Peng Ge-Hua Wang xun-min ou Institute of Energy Environment and Economy Tsinghua University China Automotive Energy Research Centre Tsinghua University

This study develops a bottom-up model to quantitatively assess the comprehensive effects of replacing traditional petroleum-powered vehicles with natural gas vehicles（NGVs） in China based on an investigation of the direct energy consumption and critical air pollutant（CAP） emission intensity, life-cycle energy use and greenhouse gas（GHG） emission intensity of NGV fleets. The results indicate that, on average, there are no net energy savings from replacing a traditional fuel vehicle with an NGV. Interestingly, an NGV results in significant reductions in direct CAP and life-cycle GHG emissions compared to those of a traditional fuel vehicle, ranging from 61% to 76% and 12% to 29%, respectively. Due to the increasing use of natural gas as a vehicle fuel in China（i.e. approximately 28.2 billion cubic metres of natural gas in2015）, the total petroleum substituted with natural gas was approximately 23.8 million tonnes（Mt）, which generated a GHG emission reduction of 16.9 Mt of CO2 equivalent and a CAP emission reduction of 1.8 Mt in 2015. Given the significant contribution of NGVs, growing the NGV population in 2020 will further increase the petroleum substitution benefits and CAP and GHG emission reduction benefits by approximately 42.5 Mt of petroleum-based fuel, 3.1 Mt of CAPs and 28.0 Mt of GHGs. By 2030, these benefits will reach 81.5 Mt of traditional petroleum fuel, 5.6 Mt of CAPs and 50.5 Mt of GHGs, respectively.

关键词： Natural gas vehicles Energy use Greenhouse gases Critical air pollutants China Life-cycle analysis

Development and application of a life cycle energy consumption and CO2emissions analysis model for high-speed railway transport in China

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Advances in Climate Change Research 2021年第2期12卷 270-280页

作者： WANG Yan-Zhe ZHou Sheng ou xun-min Tsinghua University-Zhang Jiagang Joint Institute for Hydrogen Energy and Lithium-Ion Battery Technology Tsinghua UniversityBeijing100084China Institute of Energy Environment and EconomyTsinghua UniversityBeijing100084China Tsinghua-Rio Tinto Joint Research Centre for Resources Energy and Sustainable DevelopmentLaboratory for Low Carbon EnergyTsinghua UniversityBeijing100084China China Automotive Energy Research Center Tsinghua UniversityBeijing100084China

China's high-speed railway(HSR)is booming recently,the HSR's performance of energy conservation and carbon reduction has attractedmuch *** study developed a new life cycle model of energy consumption and greenhouse gas(GHG)emissions on China's HSR bylife cycle analysis(LCA),covering the stages of infrastructure,HSR train,and operation,based on the TLCAM(Tsinghua-LCA Model).A caseof the BeijingeShanghai HSR has been studied to show that the full life cycle energy consumption and GHG emissions of HSR transportationare 0.4 MJ km1per capita and 0.04 kg CO2ekm1per capita,respectively,which are far less than aviation,gasoline vehicles,diesel vehicles,electric vehicles and public *** the cleaner power structure and the progress of HSR train technology,the energy consumption andcarbon emissions of HSR in 2020 could be reduced by 20%compared to *** study indicates that electricity generation mix structure andfull load rate are important factors influencing the life-cycle energy consumption and GHG emissions of HSR *** is recommendedto improve the coverage of HSR network,accelerate train upgrades,improve the full load rate of HSR trains,and promote the low-carbondevelopment of electricity supply to strengthen and realize the low-carbon advantage of HSR transport mode in *** transportationcan be used to achieve the low carbon transformation of China's transportation sector and improve oil supply safety situation.

关键词： High-speed railway transport Life cycle analysis Energy consumption Greenhouse gas emissions China

The low Mach number limit of non-isentropic magnetohydrodynamic equations with large temperature variations in bounded domains

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Science China Mathematics 2024年第4期67卷 787-818页

作者： min Liang Yaobin ou School of Mathematics Renmin University of ChinaBeijing 100872China

This paper verifies the low Mach number limit of the non-isentropic compressible magnetohydrodynamic(MHD)equations with or without the magnetic diffusion in a three-dimensional bounded domain when the temperature variation is large but *** uniform estimates of strong solutions are established in a short time interval independent of the Mach number,provided that the slip boundary condition for the velocity and the Neumann boundary condition for the temperature are imposed and the initial data is well-prepared.

关键词： low Mach number limit non-isentropic compressible magnetohydrodynamic equations large temperature variations bounded domains

Nitrogen-enriched micro-mesoporous carbon derived from polymers organic frameworks for high-performance capacitive deionization

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Journal of Environmental Sciences 2022年第1期34卷 282-291页

作者： Jianpei Zhang xun-an Ning Danping Li Yi Wang Xiaojun Lai Weixuan ou Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control School of Environment Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China School of Land Resources and Environment Key Laboratory of Agricultural Resource and Ecology in the Poyang Lake Basin of Jiangxi ProvinceJiangxi Agricultural UniversityNanchang 330045China

Nitrogenization is an effective method for improving the capacitive deionization(CDI)performance of porous carbon *** particular,polymer organic frameworks with heteroatom doping,containing an ordered pore structure and excellent electrochemical stability,are ideal precursors for carbon materials for high-performance *** this study,a nitrogen-enriched micro-mesoporous carbon(NMC)electrode was fabricated by carbonizing a Schiff base network-1 at 500,600,and 700℃.Scanning electron microscopy,Fourier transform infrared spectroscopy,X-ray diffraction,N_(2) adsorption-desorption,the contact angle of water,cyclic voltammetry,and electrochemical impedance spectroscopy were used to characterize the morphological structure,wettability,Brunauer–Emmett–Teller surface areas,and electrochemical performance of the *** results showed that the NMC carbonized at 600℃ achieved the best specific capacitance(152.33 F/g),as well as a high electrosorption capacity(25.53 mg/g)because of its chemical composition(15.57%N)and surface area(312 m^(2)/g).These findings prove that NMC is viable as an electrode material for desalination by high-performance CDI applications.

关键词： Polymers organic frameworks Nitrogen-doped carbon Micro-mesoporous Carbon Capacitive deionization

Entire Functions Sharing an Entire Function of Smaller Order with Their Diference Operators

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Acta Mathematica Sinica,English Series 2014年第3期30卷 481-498页

作者： Xiao min LI Hong xun YI Department of Mathematics Ocean University of China Department of Physics and Mathematics University of Eastern Finland Department of Mathematics Shandong University

We study a uniqueness question of entire functions order with their difference operators, and deal with a question in this paper extend the corresponding results obtained by Liu Examples are provided to show that the results in this paper, in sharing an entire function of smaller posed by Liu and Yang. The results -Yang and by Liu-Laine respectively. a sense, are the best possible.

关键词： Entire functions shared values difference operators uniqueness theorems

Progress of quantum molecular dynamics model and its applications in heavy ion collisions

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Frontiers of physics 2020年第5期15卷 1-64页

作者： Ying-xun Zhang Ning Wang Qing-Feng Li Li ou Jun-Long Tian min Liu Kai Zhao Xi-Zhen Wu Zhu-Xia Li China Institute of Atomic Energy Beijing 102413China Key Laboratory of Nuclear Physics and Technology Guangxi Normal UniversityGuilin 541004China Guangxi Normal University Guilin 541004China School of Science Huzhou UniversityHuzhou 313000China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Physics and Electrical Engineering Anyang Normal UniversityAnyang 455002China

In this review article,we first briefty introduce the transport theory and quantum molecular dynamics model applied in the study of the heavy ion collisions from low to intermediate *** developments of improved quantum molecular dynamics model(ImQMD)and ultra-relativistic quantum molecular dynamics model(UrQMD),are *** reaction mechanism and phenomena related to the fusion,multinucleon transrer,fragmentation,collective flow and particle production are reviewed and discussed within the framework of the two *** constraints on the isospin asymmetric muclear equation of state and in-medium nucleon nucleon cross sections by comparing the heavy ion collision data with transport models calculations in last decades are also discussed,and the uncertainties of these constraints are analyzed as ***,we discuss the future direction of the development of the transport models for improving the understanding of the reaction mechanism,the descriptions of various observables,the constraint on the nuclear equation of state,as well as for the constraint on in-medium nucleon-nucleon cross sections.

关键词： quantum molecular dynamics model low energy heavy ion collisions low-intermediate energy heavy ion collisions fusion multinucleon transfer reaction multifragmentation collective flow isospin asymmetric equation of state in-medium nucleon-nucleon cross sections

Fault Diagnosis for Service Composition by Spiking Neural P Systems with Colored Spikes

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Chinese Journal of Electronics 2019年第5期28卷 1033-1040页

作者： PANG Shanchen WANG min QIAO Sibo WANG xun CHEN Hongqi College of Computer and Communication Engineering China University of Petroleum

A variety of web services have emerged with the rapid development of the Internet. These services are often of a single function. The value-added services can be achieved by combing with multiple *** processing speed and stability of existing methods in service composition were not very well and seldom consider the fault diagnosis and handling methods for the service, which results in a greater probability of the service composition failure at run time. We use spiking neural P systems with colored spikes to model the fault of available service, component, and connector in the service composition. The proposed model can be used to locate a fault and handle it correctly when the service combination fails, the advantage of efficiency and stability of proposed method has been proved by comparing with the method of Petri net.

关键词： Spiking neural P system with colored spikes Service composition Fault handling

Tailoring Anti-Impact Properties of Ultra-High Performance Concrete by Incorporating Functionalized Carbon Nanotubes

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Engineering 2022年第11期18卷 232-245页

作者： Jialiang Wang Sufen Dong Sze Dai Pang xun Yu Baoguo Han Jinping ou School of Civil Engineering Dalian University of TechnologyDalian 116024China School of Transportation and Logistics Dalian University of TechnologyDalian 116024China Department of Civil and Environmental Engineering National University of SingaporeSingapore 117576Singapore Department of Mechanical Engineering New York Institute of TechnologyNew YorkNY 11568USA

Replacing micro-reinforcing fibers with carbon nanotubes(CNTs)is beneficial for improving the impact properties of ultra-high performance concrete(UHPC);however,the weak wettability and dispersibility of CNTs and the weakly bonded interface between CNTs and UHPC limit their effectiveness as ***,this study aims to enhance the reinforcement effect of CNTs on the impact properties of UHPC via *** ordinary CNTs,functionalized CNTs with carboxyl or hydroxyl groups can break the Si-O-Ca-O-Si coordination bond in the C-S-H gel and form a new network in the UHPC matrix,effectively inhibiting the dislocation slip inside UHPC ***,functionalized CNTs,particularly carboxyl-fu nctionalized CNTs,co ntrol the crystallization process and microscopic morphology of the hydration products,significantly decreasing and even eliminating the width of the aggregate-matrix interface transition zone of the ***,the functionalized CNTs further decrease the attraction of the negatively charged silicate tetrahedron to Ca2+in the C-S-H gel,while modifying the pore structure(particularly the nanoscale pore structure)of UHPC,leading to the expansion of the intermediate CS-H *** changes in the microstructures of UHPC brought about by the functionalized CNTs significantly enhance its dynamic compressive strength,peak strain,impact toughness,and impact dissipation energy at strain rates of 200-800 s^(-1).Impact performance of UHPC containing a small amount of carboxyl-functionalized CNTs(especially the short ones)is generally better than that of UHPC containing hydroxyl-functionalized and ordinary CNTs;it is even superior to that of UHPC with a high steel fiber content.

关键词： Functionalized carbon nanotubes Concrete Anti-impact properties Reinforcing mechanisms

Establishment of Real-Time TaqMan-Fluorescence Quantitative RT-PCR Assay for Detection and Quantification of Porcine Lipoprotein Lipase mRNA

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Agricultural Sciences in China 2009年第10期8卷 1256-1262页

作者： LIAN Hong-xia LU De-xun GAO min College of Animal Science and Veterinary Medicine Henan Agricultural University Zhengzhou 450002 P.R. China Institute of Animal Nutrition Inner Mongolian Academy of Agricultural and Animal Sciences Huhhot 010031 P.R. China

Porcine lipoprotein lipase （LPL） cDNA was cloned as the standard for real-time quantifying LPL mRNA and the TaqMan-fluorescence quantitative PCR assay for detection was established. The total RNA extracted from Longissimus dorsi of porcine was reverse-transcribed to cDNA. LPL cDNA was ligated with pGM-T vector and transformed into Escherichia coli TOP10. Plasmid DNA extracted from positive clones was verified by PCR amplification and sequenced. LPL was amplified by real-time fluorescence quantitative PCR from the plasmid DNA. The concentration of DNA template purified was detected by analyzing absorbance in 260 nm and then the combined plasmid was diluted to series as standard for fluorescence quantitative PCR （FQ-PCR）. The method of LPL mRNA real-time PCR was well established, which detected as low as 103 with the linear range 10^3 to 10^10 copies. The standard curves showed high correlations （R2 = 0.9871）. A series of standards for real-time PCR analysis have been constructed successfially, and real-time TaqMan-fluorescence quantitative RT-PCR is reliable to quantitatively evaluate FQ-PCR mRNA in L. dorsi of porcine.

关键词： porcine lipoprotein lipase FQ-PCR TaqMan fluorogenic probe

Multiple Limit Cycles in an Immune System

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Acta Mathematicae Applicatae Sinica 2008年第2期24卷 177-184页

作者： xun-cheng Huan Le-min Zhu minaya Villasana Yangzhou Polytechnic University Yangzhou 225009 China Universidad Simon Bolivar Caracas 1080-A Venezuela

The nonlinear oscillatory phenomenon has been observed in the system of immune response, which corresponds to the limit cycles in the mathematical models. We prove that the system simulating an immune response studied by Huang has at least three limit cycles in the system. The conditions for the multiple limit cycles are useful in analyzing the nonlinear oscillation in immune response.

关键词： Immune response multiple limit cycle, oscillation