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Stable attenuation-compensated reverse time migration and its application to land seismic data

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Petroleum Science 2023年第5期20卷 2784-2795页

作者： Xin-ru Mu Qiang Mao Jian-Ping huang Geosciences Department China University of Petroleum(East China)QingdaoShandong266580China Pilot National Laboratory for Marine Science and Technology(Qingdao) QingdaoShandong266000China

Intrinsic attenuation of the earth causes energy loss and phase distortion in seismic wave *** obtain high-resolution imaging results,these negative effects must be considered during reverse time migration(RTM).We can easily implement attenuation-compensated RTM using the constant Q viscoacoustic wave equation with decoupled amplitude attenuation and phase dispersion ***,the nonphysical amplitude-compensation process will inevitably amplify the high-frequency noise in the wavefield in an exponential form,causing the numerical simulation to become *** is due to the fact that the amplitude of the compensation grows exponentially with *** order to achieve stable attenuation-compensated RTM,we modify the analytic expression of the attenuation compensation extrapolation operator and make it only compensate for amplitude loss within the effective frequency *** on this modified analytic formula,we then derive an explicit time-space domain attenuation compensation extrapolation ***,the implementation procedure of stable attenuation-compensated RTM is *** addition to being simple to implement,the newly proposed attenuation-compensated extrapolation operator is superior to the conventional low-pass filter in suppressing random noise,which will further improve the imaging *** use two synthetic and one land seismic datasets to verify the stability and effectiveness of the proposed attenuationcompensated RTM in improving imaging resolution in viscous media.

关键词： Seismic attenuation Reverse time migration Stability strategy Pseudospectral method

NASICON solid electrolyte coated by indium film for all-solid-state Li-metal batteries

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Tungsten 2022年第4期4卷 316-322页

作者： yi-Jie Liu ru-yi Fang David Mitlin Materials Science and Engineering Program and Texas Materials Institute The University of Texas at AustinAustinTX78712USA

The application of all-solid-state Li-metal batteries with solid oxide electrolytes is hindered by interfacial issues,especially the solid electrolyte/Li-metal *** work introduced a uniform indium film layer on the surface of Na^(+)super ionic conductor(NASICON)solid electrolyte Li_(1.5)Al_(0.5)Ge_(1.5)P_(3)O_(12)(LAGP),which promotes the intimate contact between Li metal and solid electrolyte and hinders the side reactions at the *** impedance spectra show that the battery with coated solid electrolyte presents a smaller interfacial resistance and maintains stability after a long cycling *** contrast,the baseline battery with a pure LAGP pellet shows a contact loss after cycling with the vibration of interfacial *** Li symmetric cells with indium-modified solid electrolyte present stable cycling behavior over 400 h at 0.1 and 0.2 mA·cm^(−2).The all-solid-state Li-metal batteries with a Li anode,indium coating LAGP and two kinds of cathodes,namely carbon nanotubes(CNTs)and LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811),are prepared and *** CNTs cathode for Li-O2 and Li-air batteries has a higher specific capacity than traditional Li-ion battery *** Li-NCM811 batteries deliver an initial Coulombic efficiency of about 75%,with 82%capacity retention after 20 cycles.

关键词： All-solid-state batteries Solid electrolyte Li1.5Al0.5Ge1.5P3O12 Li-metal anode Interfacial chemistry

The Impacts of Drug Price Regulations in China

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Journal of Systems Science and Systems Engineering 2019年第6期28卷 674-693页

作者： yi Liu Juliang Zhang TCECheng yihong ru Guowei Hua Strategic Planning Department/PICC Research Institute of People's Insurance Company(Group)of China Limited Beijing 100031China School of Economics and Management Beijing Jiaotong UniversityBeijing 100044China Department of Logistics and Maritime Studies The Hong Kong Polytechnic UniversityKowloonHong KongChina

To lower pharmaceutical expenditure,the Chinese government has replaced the Fixed Percent Markup (FPM) policy with the policies of the Separation of Outpatient Pharmacies from Hospitals (SOPH) and the Zero Markup Drug (ZMD).We build a multistage game theoretic model comprising a hospital and a drugstore to analyze the policies' impacts on the providers' drug selection and pricing *** comparing the equihibrium outcomes,we draw the following conclusions:(i) FPM,especially for one imposing a strict margin ceiling,actually induces an expensive prescription given patients' great compliance.(ii) Both SOPH and ZMD can conditionally lower patients' expenditure,and their performances rely on the hospital's selection.(iii) A proper rate of insurance coverage and a removal of drug rebate are helpful to improve the policies' performance.

关键词： Drug price regulations patients' expenditure healthcare reform game theory

A FIFTH-ORDER ACCURATE WEIGHTED ENN DIFFERENCE SCHEME AND ITS APPLICATIONS

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Journal of Computational Mathematics 2001年第5期19卷 531-538页

作者： yi-qing Shen ru-quan Wang Hong-zhi Liao Department of Mathematics Yunnan UniversityKunming 650091China ICMSEC Academy of Mathematics and Systems SciencesChinese Academy of SciencesBeijing 100080China

Presents a study which constructed a high accurate difference scheme based on the ENN scheme. Overview of ENN scheme and several high order accuracy central schemes; Numerical method used; Relation between the weighte... 详细信息

关键词： ENN scheme WENO scheme shock-boundary-layer interaction

A Secure and Efficient Handover Authentication and Key Management Protocol for 5G Networks

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Journal of Communications and Information Networks 2020年第1期5卷 40-49页

作者： Jiaqi huang yi Qian Department of Electrical and Computer Engineering University of Nebraska-Lincoln1110 S 67th StreetOmahaNE 68182USA

As a major component of thefifth-generation(5G)wireless networks,network densification greatly increases the network capacity by adding more cell sites into the ***,the densified network increases the handover frequency of fast-moving mobile users,like ***,seamless handover with security provision is highly desirable in 5G *** third generation partnership project(3GPP)has been working on standardization of the handover procedure in 5G networks to meet the stringent efficiency and security ***,the existing handover authentication process in 5G networks has securityflaws,*** to replay and de-synchronization attacks,and cannot provide perfect forward *** this paper,we propose a secure and efficient handover authentication and key management protocol utilizing the Chinese remainder *** proposed scheme preserves the majority part of the original 5G system architecture defined by 3GPP,thus can be easily implemented in *** security analysis based on BAN-logic shows that the proposed scheme achieves secure mutual authentication and can remedy some security flaws in original 5G handover *** analysis shows that the proposed protocol has lower communication overhead and computation overhead compared with other handover authentication schemes.

关键词： 5G wireless network handover authentication key management security

Design a Hybrid Energy-Supply for the Electrically Driven Heavy-Duty Hexapod Vehicle

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Journal of Bionic Engineering 2023年第4期20卷 1434-1448页

作者： Zhenyu Xu Haoyuan yi Dan Liu ru Zhang Xin Luo State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan430074China Research Institute Inner Mongolia First Machinery Group Co.LtdBaotou014030China

Increasing the power density and overload capability of the energy-supply units(ESUs)is always one of the most challenging tasks in developing and deploying legged vehicles,especially for heavy-duty legged vehicles,in which significant power fluctuations in energy supply exist with peak power several times surpassing the average *** ESUs with high power density and high overload can compactly ensure fluctuating power source supply on *** can avoid the ultra-high configuration issue,which usually exists in the conventional lithium-ion battery-based or engine-generator-based ***,it dramatically reduces weight and significantly increases the loading and endurance capabilities of the legged *** this paper,we present a hybrid energy-supply unit for a heavy-duty legged vehicle combining the discharge characteristics of lithium-ion batteries and peak energy release/absorption characteristics of supercapacitors to adapt the ESU to high overload power *** parameters of the lithium-ion battery pack and supercapacitor pack inside the ESU are optimally matched using the genetic algorithm based on the energy consumption model of the heavy-duty legged *** experiment results exhibit that the legged vehicle with a weight of 4.2 tons can walk at the speed of 5 km/h in a tripod gait under a reduction of 35.39%in weight of the ESU compared to the conventional lithium-ion battery-based solution.

关键词： Heavy-duty legged vehicles Hybrid energy-supply unit Power fluctuation Optimal matching of lithium-ion battery pack and supercapacitor pack

Modulating the electrode–electrolyte interface enables switchable selectivity in electrocatalytic furfural reduction

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Science China Chemistry 2024年第10期67卷 3193-3194页

作者： Jingfang Zhang yi huang Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education School of Chemical Engineering&PharmacyWuhan Institute of TechnologyWuhan 430205China College of Chemistry Central China Normal UniversityWuhan 430079China

Furfural(FF),an important bio-based platform molecule,can be valorized to high-value-added chemicals(e.g.,furfuryl alcohol(FA)or 2-methylfuran(MF))through catalytic hydrogenation[1].The traditional thermocatalytic transformation of FF always requires high-temperature and highpressure conditions[2].Accordingly,electrocatalytic hydrogenation is emerging as a promising approach for the selective reduction of FF to FA or MF under environmentally friendly and benign conditions.

关键词： hydrogenation electrolyte selectivity

Distributed best response dynamics for Nash equilibrium seeking in potential games

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Control Theory and Technology 2020年第3期18卷 324-332页

作者： Shijie huang Peng yi Key Lab of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100190China Department of Control Science&Engineering Tongji UniversityShanghai 201804China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 201804China

In this paper,we consider distributed Nash equilibrium(NE)seeking in potential games over a multi-agent network,where each agent can not observe the actions of all its *** on the best response dynamics,we design a distributed NE seeking algorithm by incorporating the non-smooth finite-time average tracking dynamics,where each agent only needs to know its own action and exchange information with its neighbours through a communication *** give a sufficient condition for the Lipschitz continuity of the best response mapping for potential games,and then prove the convergence of the proposed algorithm based on the Lyapunov *** simulations are given to verify the resultandillustrate the effectiveness of the algorithm.

关键词： Distributed algorithms Nash equilibrium seeking best response dynamics non-smooth finite-time tracking dynamics potential games

The Production of Pseudo Goldstone Boson in Top Quark Rare Decay

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Communications in Theoretical Physics 2002年第5期38卷 566-570页

作者： huang Jin-Shu LU Gong-ru Department of Physics Henan Nanyang Normal College Nanyang 473061 China Department of Physics Henan Normal University Xinxiang 453002 China

We calculate the flavor changing t → cπ0 decay in the framework of the topcolor assisted multiscaletechnicolor model. We find that (a) the branching ratio of t → cπ0 is insensitive to mπ, mπs and mπt, while it increasesquickly as ε increases; (b) for reasonable ranges of the parameters, the maximum of the branching ratio in this modelmay reach 7 × 10-6, seven orders larger compared to the one t → cH0 calculated in the standard model. This mightprovide an opportunity to detect the rare decay of the top quark in experiments.

关键词： branching ratio, rare decay of the top quark, pseudo Goldstone boson, technicolor