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weak cosmic censorship conjecture in the nonlinear electrodynamics black hole under the charged scalar field

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Communications in Theoretical Physics 2020年第1期72卷 89-95页

作者： Tianhao Bai Wei Hong Benrong Mu Jun Tao Center for Theoretical Physics College of PhysicsSichuan UniversityChengdu610065China Physics Teaching and Research Section College of Medical TechnologyChengdu University of Traditional Chinese MedicineChengdu 611137China

In this paper,we study the thermodynamics and the weak cosmic censorship conjecture of the nonlinear electrodynamics black hole under the scattering of a charged complex scalar *** to the energy and charge fluxes of the scalar field,the variations of this black hole’s energy and charge can be calculated during an infinitesimal time *** scalar field scattering,the variation of the black hole is calculated in the extended and normal phase *** the normal phase space,the cosmological constant and the normalization parameter are fixed,and the first and second laws of thermodynamics can also be *** the extended phase space,the cosmological constant and the normalization parameter are considered as thermodynamic variables,and the first law of thermodynamics is valid,but the second law of thermodynamics is not ***,the weak cosmic censorship conjecture is both valid in the extended and normal phase spaces.

关键词： nonlinear electrodynamics black hole weak cosmic censorship conjecture complex scalar field thermodynamics

weak CONVERGENCE OF SOME DIRICHLET SERIES

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Acta Mathematica Scientia 2001年第4期21卷 433-439页

作者：丁夏畦罗佩珠 Institute of Applied Mathematics Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China

This paper treats Dirichlet series from the point of view developed in [1],[2]. Especially it is found that the kernal function is closely related with the Riemann Zeta-function.

关键词： weak Dirichlet series zeta-function

Small-signal stability analysis of photovoltaic generation connected to weak AC grid

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Journal of Modern Power Systems and Clean Energy 2019年第2期7卷 254-267页

作者： Qi JIA Gangui YAN Yuru CAI Yonglin LI Jinhao ZHANG Northeast Electric Power University

A small-signal model of photovoltaic(PV)generation connected to weak AC grid is established based on a detailed model of the structure and connection of a PV generation system. An eigenvalue analysis is then employed to study the stability of PV generation for different grid strengths and control parameters in a phaselocked loop(PLL) controller in the voltage source converter. The transfer function of the power control loop in the dq rotation frame is developed to reveal the influence mechanism of PLL gains on the small-signal stability of PV generation. The results can be summarized as follows:(1)oscillation phenomena at a frequency of about 5 Hz may occur when the grid strength is low;(2) the tuning control parameters of the PLL have a noticeable effect on the damping characteristics of the system, and larger proportional gain can improve the system damping;(3)within a frequency range of 4-5 Hz,the PLL controller has positive feedback on the power loop of PV generation. A virtual inductance control strategy is proposed to improve the operational stability of PV generation. Finally, a simulation model of PV generation connected to weak AC grid is built in PSCAD/EMTDC and the simulation results are used to validate the analysis.

关键词： Photovoltaic generation weak AC grid Small-signal model Eigenvalue analysis Virtual inductance control strategy

weak (1,1) Boundedness of Oscillatory Singular Integral with Variable Phase

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Acta Mathematica Sinica,English Series 2019年第11期35卷 1741-1759页

作者： Hai Xia YU Jun Feng LI Department of Mathematics Sun Yat-sen UniversityGuangzhou 510275P.R.China School of Mathematical Sciences Dalian University of TechnologyDalian 116024P.R.China

In this paper,the weak(1,1)boundedness of oscillatory singular integral with variable phase P(x)γ(y)for any x,y∈R,Tf(x):=p.v.∫∞-∞eiP(x)γ(y)f(x?y)dy/y is studied,where P is a real monic polynomial on R.

关键词： weak (1,1) boundedness oscillatory singular integral variable curve

weak martingale Hardy spaces and weak atomic decompositions

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Science China Mathematics 2006年第7期49卷 912-921页

作者： HOU Youliang & REN Yanbo School of Mathematics and Statistics, Wuhan University, Wuhan 430072, China Department of Mathematics & Physics, Henan University of Science and Technology, Luoyang 471003, China School of Mathematics and Statistics Wuhan University Wuhan China Department of Mathematics & Physics Henan University of Science and Technology Luoyang China

In this paper we define some weak martingale Hardy spaces and three kinds of weak atoms. They are the counterparts of martingale Hardy spaces and atoms in the classical martingale Hp-theory. And then three atomic decomposition theorems for martingales in weak martingale Hardy spaces are proved. With the help of the weak atomic decompositions of martingale, a sufficient condition for a sublinear operator defined on the weak martingale Hardy spaces to be bounded is given. Using the sufficient condition, we obtain a series of martingale inequalities with respect to the weak Lp-norm, the inequalities of weak (p ,p)-type and some continuous imbedding relationships between various weak martingale Hardy spaces. These inequalities are the weak versions of the basic inequalities in the classical martingale Hp-theory.

关键词： martingale, weak Hardy space, weak atom, atomic decomposition.

weak Summer Monsoon during the Early Holocene Inferred from the Dingxi Lujiagou Floodplain Lake-Eolian Sand Rhythm due to Solar Impacting

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Acta Geologica Sinica(English Edition) 2019年第3期93卷 778-779页

作者： ZHANG Wanyi ZHANG Huirong MA Yuan WANG Xiaoyu Steffen MISCHKE ZHANG Chengjun College of Earth Sciences&Key Laboratory of Mineral Resources in Western China(Gansu Province) Lanzhou UniversityLanzhou 730000China College of Earth and Environmental Sciences Lanzhou UniversityLanzhou 730000China Faculty of Earth Sciences University of Iceland101 ReykjavikIceland

Objective Precipitation was the highest in the loess plateau during the Early Holocene 10-8 ka BP even to the period 10-3.0 ka BP in the Kesang cave stalagmite westward Tianshan,Xinjiang,based on large numbers of records from paleoclimatic proxies(An et al.,2000;Zhang et al.,2009;Zhang et al.,2018).However,we discovered at first time that floodplain lake-eolian stratigraphical rhythm complex kept in the Lujiagou of Dingxi,Gansu,which was important geological proof to indicate a weak summer monsoon transition period during the Early Holocene in the Chinese Loess Plateau.

关键词： Solar Impacting weak Summer Monsoon

Optimal Noise Suppression of Phase Damping Quantum Systems via weak Measurement

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Journal of Systems Science & Complexity 2019年第5期32卷 1264-1279页

作者： HARRAZ Sajede CONG Shuang KUANG Sen Department of Automation University of Science and Technology of China

One qubit subjected to the effect of phase damping in a two-level quantum system with arbitrary pure initial state is studied in this paper. The aim of this paper is to find the optimal control scheme to correct the qubit back as close as possible to its initial state. The strength-dependent measurements and control correction rotation in different bases are designed to protect the arbitrary pure state of qubit. The authors design the optimal weak measurement strength to achieve the best trade-off between gaining the information of the system and the disturbance through *** authors study the suppression of phase damping in two cases: There is and isn’t the y component in initial state. The authors deduce the optimal parameters and performances of the control schemes for the various initial state situations. Simulation results demonstrate the effectiveness of the proposed control schemes.

关键词： Open quantum system optimal noise suppression phase damping quantum system control weak measurement

Novel Woods-Saxon stochastic resonance system for weak signal detection

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Chinese Physics B 2020年第4期29卷 190-198页

作者：周永辉许雪梅尹林子丁一鹏丁家峰孙克辉 School of Physics and Electronics Central South UniversityChangsha 410083China

We propose a joint exponential function and Woods–Saxon stochastic resonance(EWSSR)*** change of a single parameter in the classical stochastic resonance model may cause a great change in the shape of the potential function,it is difficult to obtain the optimal output signal-to-noise ratio by adjusting one *** the novel system,the influence of different parameters on the shape of the potential function has its own emphasis,making it easier for us to adjust the shape of the potential *** system can obtain different widths of the potential well or barrier height by adjusting one of these parameters,so that the system can match different types of input signals *** adjusting the system parameters,the potential function model can be transformed between the bistable model and the monostable *** potential function of EWSSR has richer shapes and geometric *** effects of parameters,such as the height of the barrier and the width of the potential well,on SNR are studied,and a set of relatively optimal parameters are ***,the EWSSR model is compared with other classical stochastic resonance *** experiments show that the proposed EWSSR model has higher SNR and better noise immunity than other classical stochastic resonance ***,the EWSSR model is applied to the detection of actual bearing fault signals,and the detection effect is also superior to other models.

关键词： stochastic resonance weak signal detection a joint exponential function and Woods-Saxon stochastic resonance signal-to-noise ratio

Guiding and routing of a weak signal via a reconfigurable gravity-like potential

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Photonics Research 2019年第9期7卷 1087-1093页

作者： ZHILI LI PING ZHANG XUE MU PENGBO JIA YI HU ZHIGANG CHEN JINGJUN XU MOE Key Laboratory of weak-Light Nonlinear Photonics TEDA Applied Physics Institute and School of PhysicsNankai UniversityTianjin 300457China Department of Physics and Astronomy San Francisco State UniversitySan FranciscoCalifornia 94132USA

We demonstrate both experimentally and theoretically the trapping and guiding of a weak signal pulse via a selfaccelerating Airy pulse. This is achieved by launching the Airy pulse in the anomalous dispersion regime of an optical fiber, thereby inducing a gravity-like potential that can compel the signal pulse in the normal dispersion regime to undergo co-acceleration. Such guiding pulse by pulse can be controlled at ease simply by altering the acceleration conditions of the Airy pulse. Furthermore, the guided signal can be featured with either single or double peaks, which is explained by using the theory of fundamental and second-order quasi-modes associated with the gravity-like potential. Our work represents, to our knowledge, the first demonstration of pulse guiding in the anomalous dispersion regime of any self-accelerating pulse.

关键词： simulation Guiding and routing of a weak signal via a reconfigurable gravity-like potential