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Chinese Physics B 2019年第12期28卷 113-117页

作者： Yi-Huan Wei Department of Physics Bohai UniversityJinzhou 121000China

We propose a regular spherically symmetric spacetime solution with three parameters in Einstein gravity coupled to nonlinear electrodynamics(NED), which describes the NED black hole with electric charge. It is found that the system enclosed by the horizon of NED spacetime satisfies the first law of thermodynamics. In order to obtain the NED spacetime with only electric charge, the case of two parameters taking the same value is considered. In this case, we express the mass of the NED spacetime as a function of the entropy and electric charge of the NED black hole, give the Smarr-like formula and the approximate Smarr formula for the mass of NED spacetime.

关键词： regular nonlinear electrodynamics(NED) spacetime NED black hole with electric charge first law of thermodynamics Smarr formula

Heat Generation by Electric Current in a Quantum Dot Molecular Coupled to Ferromagnetic Leads

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Communications in Theoretical Physics 2014年第9期61卷 423-429页

作者：郭宇孙连亮迟锋 School of Mathematics and Physics Bohai University College of Science North China University of Technology College of Engineering Bohai University

We study the properties of the heat flow generated by electric current in a quantum dot(QD) molecular sandwiched between two ferromagnetic leads. The heat is exchanged between the QD and the phonon reservoir coupled to it. We find that when the leads' magnetic moments are in parallel configuration, the total heat generation is independent on the leads' spin-polarization regardless of the magnitude of the intradot Coulomb interaction. This behavior is similar to that of the electronic current. In the antiparallel configuration, however, the influences of the leads' ferromagnetism on the heat generation are quite different from those on the electric current. Under the conditions of weak intradot Coulomb interaction and small bias voltage, the heat generation is monotonously suppressed by increasing leads' *** for sufficient large intradot Coulomb interaction and bias voltage, the heat generation shows non-monotonous behavior due to the electron-phonon interaction and the spin accumulation induced on the dot. Furthermore, the magnitude of the negative differential of the heat generation previously found in a QD connected to nonmagnetic leads can be weakened by the increase of the spin-polarization of the ferromagnetic leads.

关键词： quantum dot heat generation ferromagnetic lead

Stacking MoS_(2) flower-like microspheres on pomelo peels-derived porous carbon nanosheets for high-efficient X-band electromagnetic wave absorption

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Nano Research 2024年第3期17卷 1607-1615页

作者： Jia Zhao Zhe Gu Qingguo Zhang College of Chemistry and Materials Engineering Bohai UniversityJinzhou 121013China

The key to solve increasingly severe electromagnetic(EM)pollution is to explore sustainable,easily prepared,and cost-effective EM wave absorption materials with exceptional absorption ***,instead of anchoring on carbon materials in single layer,MoS_(2) flower-like microspheres were stacked on the surface of pomelo peels-derived porous carbon nanosheets(C)to fabricate MoS_(2)@C nanocomposites by a facile solvothermal *** wave absorption performances of MoS_(2)@C nanocomposites in X-band were systematically investigated,indicating the minimum reflection loss(RLmin)of-62.3 dB(thickness of 2.88 mm)and effective absorption bandwidth(EAB)almost covering the whole X-band(thickness of 2.63 mm)with the filler loading of only 20 wt.%.Superior EM wave absorption performances of MoS_(2)@C nanocomposites could be attributed to the excellent impedance matching characteristic and dielectric loss capacity(conduction loss and polarization loss).This study revealed that the as-prepared MoS_(2)@C nanocomposites would be a novel prospective candidate for the sustainable EM absorbents with superior EM wave absorption performances.

关键词： pomelo peels-derived porous carbon nanosheets(C) MoS_(2)@C nanocomposites stacked structure electromagnetic(EM)wave absorption

Higher-order rogue waves with controllable fission and asymmetry localized in a(3+1)-dimensional generalized Boussinesq equation

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Communications in Theoretical Physics 2023年第1期75卷 21-38页

作者： Sheng Zhang Ying Li School of Mathematical Sciences Bohai UniversityJinzhouChina

The purpose of this paper is to report the feasibility of constructing high-order rogue waves with controllable fission and asymmetry for high-dimensional nonlinear evolution *** a nonlinear model considered in this paper as the concrete example is the(3+1)-dimensional generalized Boussinesq(gB)equation,and the corresponding method is Zhaqilao’s symbolic computation approach containing two embedded *** is indicated by the(3+1)-dimensional gB equation that the embedded parameters can not only control the center of the first-order rogue wave,but also control the number of the wave peaks split from higher-order rogue waves and the asymmetry of higher-order rogue waves about the coordinate *** main novelty of this paper is that the obtained results and findings can provide useful supplements to the method used and the controllability of higher-order rogue waves.

关键词： higher-order rogue wave controllable fission and asymmetry symbolic computation approach (3+1)-dimensional gB equation

Risks and Firms' Decision Making on Outward Foreign Direct Investment: An Empirical Analysis of china's State-owned Enterprises

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china & World Economy 2022年第6期30卷 163-182页

作者： Xiaosong Wang Huan Wu Le Li School of Economics Renmin University of ChinaChina Post-doctoral Workstation of china Export and Credit Insurance Corporation China china bohai bank China

This study explored how the risks encountered by Chinese state-owned enterprises(SOEs)affected their decision-making on outward foreign direct investment(OFDI),using data regarding the relationship between the host countries and *** following conclusions were *** SOEs with fixed capital exhibited a higher probability of conducting OFDI and did so on a larger *** risks in host countries significantly hindered the OFDI of Chinese *** pursuit of natural resources,Chinese SOEs chose to take *** amount of OFDI by SOEs was positively related to the political,economic,and geographical relations between china and the corresponding hostcountry.

关键词： bilateral relations OFDI risks SOEs

Quantum Secure Communication Using a Class of Three-Particle W State

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Communications in Theoretical Physics 2008年第8期50卷 359-362页

作者： DONG Li XIU Xiao-Ming GAO Ya-Jun CHI Feng Department of Physics Bohai University Jinzhou 121000 China

A theoretical scheme of quantum secure communication using a class of three-particle W states is proposed. In the scheme,two communicators may communicate after they test the security of the quantum *** receiver can obtain the secret message determinately if the quantum channel is *** present scheme can be realized without using teleportation.

关键词： quantum cryptography quantum secret communication W state

Resilient Event-Triggered Control of Connected Automated Vehicles Under Cyber Attacks

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IEEE/CAA Journal of Automatica Sinica 2023年第12期10卷 2300-2302页

作者： Ning Zhao Xudong Zhao Ning Xu Liang Zhang the College of Control Science and Engineering Bohai UniversityJinzhou 121013China the Institute of Ocean Research Bohai UniversityJinzhou 121013China the Faculty of Electronic Information and Electrical Engineering Dalian University of TechnologyDalian 116024China the College of Information Science and Technology Bohai UniversityJinzhou 121013China

Dear Editor,This letter contributes to designing a resilient event-triggered controller for connected automated vehicles under cyber attacks,including denial-of-service(DoS)and deception *** characterize the effect of... 详细信息

关键词： DoS service automated

Eco-friendly synthesis of 2-substituted-2,3-dihydro-4(1H)-quinazolinones in water

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Chinese Chemical Letters 2011年第4期22卷 427-430页

作者： Min Wang Ting Ting Zhang Zhi Guo Song College of Chemistry and Chemical Engineering Bohai University Jinzhou 121000 China Centerfor Science & Technology Experiment Bohai University Jinzhou 121000 China

2-Substituted-2,3-dihydro-4（1H）-quinazolinones were synthesized in high yield by condensation of 2-anthranilamide with aromatic aldehydes or ketones in refluxing water without *** protocol has advantages of high yie... 详细信息

关键词： 2 3-Dihydro-4(1H)-quinazolinone 2-Anthranilamide Aldehydes Ketones Synthesis in water

Quantum Secure Direct Communication Using Six-Particle Maximally Entangled States and Teleportation

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Communications in Theoretical Physics 2009年第3期51卷 429-432页

作者： XIU Xiao-Ming DONG Li GAO Ya-Jun CHI Feng Department of Physics Bohai University Jinzhou 121000 China

The sender shares six-particle maximally entangled states as quantum channel with the receiver. If the quantum channel is secure, the sender performs projective measurements and tells the measurement outcome to the receiver. The receiver performs the unitary transformations and makes projective measurements on his particles to obtain the secret information. Using teleportation, the transmission of three-qubit secret information can be completed in each quantum channel

关键词： quantum secret direct communication quantum teleportation six-particle maximally entangled state

Quantum Secure Direct Communication with Four-Particle Genuine Entangled State and Dense Coding

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Communications in Theoretical Physics 2009年第7期52卷 60-62页

作者： XIU Xiao-Ming DONG Li GAO Ya-Jun CHI Feng Department of Physics Bohai University Jinzhou 121000 China

A quantum secure direct communication scheme using dense coding is *** first,the sender (Alice)prepares four-particle genuine entangled states and shares them with the receiver (Bob) by sending two particles in eachentangled state to ***,Alice encodes secret information by performing the unitary transformations on herparticles and transmits them to ***,Bob performs the joint measurements on his particles to decode the *** two-step security test guarantees the security of communication.

关键词： quantum communication quantum secure direct communication entanglement swapping four- particle genuine entangled state