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Quasinormal oscillations and late-time tail of massless scalar perturbations of a magnetized black hole in Rastall gravity

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Chinese Physics C 2022年第10期46卷 215-229页

作者： Cai-Ying shao Yu-Jie Tan cheng-Gang shao Kai Lin Wei-Liang Qian MOE Key Laboratory of Fundamental Physical Quantities Measurement Hubei Key Laboratory of Gravitation and Quantum PhysicsPGMFand School of PhysicsHuazhong University of Science and Technology430074 WuhanChina Hubei Subsurface Multi-scale Imaging Key Laboratory Institute of Geophysics and GeomaticsChina University of Geosciences430074 WuhanChina Escola de Engenharia de Lorena Universidade de Sao Paulo12602-810LorenaSPBrazil Faculdade de Engenharia de Guaratinguetá Universidade Estadual Paulista12516-410GuaratinguetáSPBrazil and Center for Gravitation and Cosmology School of Physical Science and TechnologyYangzhou University225002 YangzhouChina

In this study,we investigate the quasinormal mode and late-time tail of charged massless scalar perturbations of a black hole in generalized Rastall *** black hole metric in question is spherically symmetric,accompanied by a power-Maxwell field surrounded by a quintessence *** show that the massless scalar field,when dressed up with the magnetic field,acquires an effective mass,which significantly affects the properties of the resultant quasinormal oscillations and late-time ***,the quasinormal frequencies become distorted and might even be unstable for particular spacetime ***,the exponent of the usual power-law tail is modified according to the modification in the structure of the branch cut of the retarded Green s *** particular,as the effective mass is generated dynamically owing to the presence of the magnetic field,we may consider a process through which the field is gradually removed from the spacetime *** this context,while the quasinormal oscillations converge to the case of massless perturbations,we argue that the properties of resultant late-time tails do not fall back to their massless *** relevant characteristics are investigated using numerical and analytic approaches.

关键词： black hole quasinormal modes late-time tail Rastall gravity

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An Adaptive Learning Method for the Generation of Fuzzy Inference System from Data

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自动化学报 2008年第1期34卷 80-87页

作者： ZHANG Li-Quan shao cheng Institute of Advanced Control Technology Dalian University of Technology Dalian 116024 P.R. China College of Electric and Information Engineering Beijing University of Civil Engineering and Architecture Beijing 100044 P.R. China

Designing a fuzzy inference system(FIS)from data can be divided into two main phases:structure identification and parameter ***,starting from a simple initial topology,the membership functions and system rules are defined as specific ***,to speed up the convergence of the learning algorithm and lighten the oscillation,an improved descent method for FIS generation is ***, the convergence and the oscillation of the algorithm are system- atically ***,using the information obtained from the previous phase,it can be decided in which region of the in- put space the density of fuzzy rules should be enhanced and for which variable the number of fuzzy sets that used to partition the domain must be ***,this produces a new and more appropriate ***,the proposed method is applied to the problem of nonlinear function approximation.

关键词：自适应学习模糊推论系统数据处理非线性函数逼近梯度演化信度

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An investigation on the dosimetric impact of hip prosthesis in radiotherapy

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Nuclear Science and Techniques 2016年第1期27卷 29-36页

作者： Wen-cheng shao Yan-Ling Bai Wen-Bo Zhao Pu-Nan Sun Feng-Li Liu Department of Radiation Physics Harbin Medical University Cancer Hospital Beijing Xiao Qing Environmental Engineering Co. LtdHarbin office School of physical science and technology Heilongjiang University

The objectives of this study are to evaluate the dosimetric impact of hip prosthesis using ELEKTA linac X-rays and compare the dose perturbations of metallic and nonmetallic hip prostheses. The local dose distributions of typical hip prostheses were calculated for 4, 8, and 15 MV beams by Geant4. Three prosthesis materials were selected in calculation to reveal the relation between material type and local dose perturbations of prostheses. Furthermore,the effect of nominal energy on prosthesis perturbation was also discussed and analyzed. Taking the calculated dose to the hip joint as reference, considerable differences were observed between prostheses and hip joints. In the prosthesis shadow region, the relative dose decreasing was up to 36, 21, and 16 % for the Co–Cr–Mo alloy, titanium alloy, and ceramic prostheses, respectively. In backscattering region, the relative dose increasing was about1–7 %. Overall, the results show that the dose perturbation effect of prostheses was mainly determined by material type, nominal energy, and density. Among these typical hip prostheses, ceramic prosthesis introduces the lowest dose perturbations.

关键词：髋关节剂量学假体放射治疗扰动效应 Geant4 X射线剂量直线加速器

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Influence of the Earth's Rotation on Measurement of Newton's Constant by using the Angular Acceleration Method

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Chinese Physics Letters 2012年第6期29卷 42-45页

作者： LUO Jie shao cheng-Gang WANG Dian-Hong TIAN Yuan Department of Physics Huazhong University of Science and TechnologyWuhan 430074 Faculty of Mechanical and Electronic Information China University of GeosciencesWuhan 430074

Using the relativistic Lagrangian expression,we develop a method to derive the equation of motion of the torsion balance in a non-inertial reference frame,which is used to analyze the gravitational experiment in measuring Newton's constant G with the angular acceleration *** calculation shows that the Earth's rotation couples with the vibration,which should be considered in the high-accuracy experiments of determining the gravitational constant G.

关键词： method torsion rotation

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Prognosis of Liver Transplantation for Hepatocellular Carcinoma in Terms of Different Criteria:A Single Center Experience

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Current Medical Science 2022年第3期42卷 548-554页

作者： shao-cheng LYU Jing WANG Zhang-yong REN Di CAO Qiang HE Department of Hepatobiliary Surgery Beijing Chaoyang HospitalCapital Medical UniversityBeijing 100020China

Objective Patients undergoing liver transplantation for hepatocellular carcinoma(HCC)within the Milan criteria have an excellent *** developed a program to analyze and prove that the Milan criteria can be expanded safely and *** We retrospectively reviewed 117 HCC patients treated with liver transplantation between January 2013 and December *** were grouped according to the Milan criteria,the University of California,San Francisco(UCSF)criteria,Up-to-seven criteria and Hangzhou ***-free and overall survival rates were investigated with a Kaplan-Meier *** regression Cox models produced survival estimates for the patients that exceeded the Milan *** The 1-year,3-year and 5-year overall survival rates of patients fulfilling the Milan criteria(n=44)were 100%,87.5%and 78.9%,*** with the Milan criteria,the UCSF criteria(n=50),Up-to-seven criteria(n=51)and Hangzhou criteria(n=86)provided an expansion of 13.6%,15.9%and 95.9%,*** 1-year,3-year and 5-year overall survival rates of patients fulfilling UCSF criteria,Up-to-seven criteria and Hangzhou criteria were 96.0%,84.9%,76.9%;96.1%,85.2%,77.6%and 97.7%,83.9%,66.7%,respectively(P>0.05).Multifactor Cox regression showed that tumor diameter and microvascular invasion were independent risk factors for survival in patients that exceeded the Milan *** Compared with the Milan criteria,the Hangzhou criteria can safely expand the scope of liver transplantation for HCC to a certain *** contrast,the UCSF criteria and Up-to-seven criteria result in a limited number of patients which need further *** diameter and microvascular invasion were the independent risk factors for survival in patients that exceeded the Milan criteria.

关键词： liver transplantation hepatocellular carcinoma survival Milan criteria

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Exploiting methylated amino resin as a multifunctional binder for high-performance lithium-sulfur batteries

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Rare Metals 2021年第3期40卷 529-536页

作者： Xing-Xing Gu Zhen-Guo Yang Shuang Qiao cheng-Bin shao Xiao-Lei Ren Jing-Jing Yang Chongqing Key Laboratory of Catalysis and New Environmental Materials College of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China Chongqing Jianfeng Industrial Group Co. Ltd.Chongqing 408601China GRINM Group Co. Ltd.Beijing 100088China Faculty of Civil Aviation and Aeronautics Kunming University of Science and TechnologyKunming 650000China

The practical application of Li-S batteries is severely restricted by limited cycle life and low sulfur ***,a common industrial paint,methylated amino resin(MAR),was employed as a novel multifunctional binder to address these *** S cathodes by using MAR binder(S@MAR) demonstrate an excellent reversible capacity of 480.9 mA·h·g^(-1) after 400 cycles at a rate of 0.5 C,and the sulfur loading in the electrode could achieve as high as 3.0 mg·cm^(-2).These achievements are ascribed to the superior mechanical property for volume expansion,better adsorption ability toward poly sulfides,and more favorable Li+transportation of MAR,compared to the conventional binders of polyvinylidene difluoride and *** study paves a new way for obtaining high-energy-density Li-S batteries by the simple application of multifunctional binder that are inherently cost-effective.

关键词： Methylated amino resin N-rich functional group Li-S batteries Superior mechanical property Polysulfides adsorption

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从废水中回收能量的微生物燃料电池技术:走向实际应用的机遇和挑战(英文)

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2014年第11期15卷 841-861页

作者： Wei-feng LIU shao-an cheng State Key Laboratory of Clean Energy Department of Energy EngineeringZhejiang University

废水中蕴含着大量能量,如何高效地回收利用这些能量对于满足世界能源需求,降低废水处理成本,提高污水处理的可持续性具有重要意义。微生物燃料电池(MFC)是近年来发展起来的一种从废水的有机污染物中提取能量的新型生物技术,有望实现废... 详细信息

废水中蕴含着大量能量,如何高效地回收利用这些能量对于满足世界能源需求,降低废水处理成本,提高污水处理的可持续性具有重要意义。微生物燃料电池(MFC)是近年来发展起来的一种从废水的有机污染物中提取能量的新型生物技术,有望实现废水处理的可持续性发展。然而,目前MFC技术离实际应用还有很长的距离。MFC系统的扩大化问题是阻碍该技术实际应用的关键。本文详细讨论了MFC扩大化过程中的主要问题和挑战,并提出了未来的发展方向。MFC与其他技术结合可以实现较高的出水水质或获得高商业价值的化学品,然而该方面的研究才刚刚起步,要实现其实际应用还需要解决许多问题,包括如何提高生产效率,提高经济可行性,提升系统的稳定性和可靠性等。

关键词：微生物燃料电池废水处理可持续发展扩大化合成化学品

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Production of Free Amino Acid and Short Peptide Fertilizer from Rapeseed Meal Fermentation Using Bacillus flexus NJNPD41 for Promoting Plant Growth

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Pedosphere 2018年第2期28卷 261-268页

作者： LIU Hongjun ZHONG Xi HUANG Yan QIAO Cece shao cheng LI Rong SHEN Qirong Jiangsu Provincial Key Lab for Solid Organic Waste Utilization Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization National Engineering Research Center for Organic-based Fertilizers Nanjing Agricultural University

Free amino acids and short peptides(FAPS)that play an important role in plant nutrition can be extracted from rapeseed meal(RSM)by microbial *** enzymolytic activity of one bacterial strain isolated from RSM for the production of FAPS fertilizer(FAPSF)via solid-state fermentation,as well as its detoxification activity for isothiocyanates and oxazolidinethione,was investigated in this *** strain NJNPD41 isolated from RSM piled-soil possessed effective proteolytic activity and was identified as Bacillus flexus on the basis of its morphological,physiological,and biochemical properties,as well as 16S rDNA *** to the uninoculated control,inoculation with the strain NJNPD41 significantly increased the yield of total free amino acids and short peptides by 115%and decreased the content of isothiocyanates and oxazolidinethione by 53%and 60%,respectively,after solid-state *** pot and field experiments showed that FAPSF significantly promoted eggplant growth and enhanced the fruit yield and quality of eggplant compared to the *** conclusion,this study provided a novel method for the high-value utilization of RSM to produce high-quality and low-toxicity FAPSF using the newly isolated strain *** NJNPD41.

关键词： bacterial strain detoxification activity isothiocyanate microbial enzymolysis N pool organic fertilizer solid-statefermentation oxazolidinethione

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Hot Deformation Behavior of Vanadium-microalloyed Medium-carbon Steel for Fracture Splitting Connecting Rod

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Journal of Iron and Steel Research International 2015年第7期22卷 615-621页

作者： Wei-jun HUI Si-lian CHEN cheng-wei shao Yong-jian ZHANG Han DONG School of Mechanical Electronic and Control EngineeringBeijing Jiaotong University Central Iron and Steel Research Institute

Single compression tests were carried out with a Gleeble-3800 thermal simulator to investigate hot deform- ation behavior of two vanadium-microalloyed medium-carbon steels for fracture splitting connecting rod. The tests were performed to a total true strain of 0.92 at true strain rates ranging from 10-2 to 10 s-1 and deformation temper- ature of 900--1 150 ℃, The results show that hot deformation behavior of the tested steels is similar to that of con- ventional medium-carbon microalloyed steels and dynamic recrystallization is easier to occur at higher deformation temperature and lower strain rate. The austenite deformation resistance and activation energy of deformation increase with increasing vanadium content from 0.15% to 0. 28% and thus the starting time of dynamic recrystallization was delayed. Finer recrystallized austenite grain could he obtained at higher strain rate, lower deformation temperature and higher vanadium content. TEM observation of the specimens quenched just before and after deformation reveals that vanadium is mainly in dissolved solute condition in austenite and thus affects the dynamic recrystallization behavior of the tested steels mainly through solute-drag effect.

关键词： vanadium microalloyed medium-carbon steel hot deformation dynamic recrystallization fracture splitting connected rod

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Adaptive Fuzzy Backstepping Output Feedback Control of Nonlinear Time-delay Systems with Unknown High-frequency Gain Sign

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International Journal of Automation and computing 2011年第1期8卷 14-22页

作者： Chang-Liang Liu shao-cheng Tong Yong-Ming Li Yuan-Qing Xia Department of Basic Mathematics Liaoning University of Technology Jinzhou 121001 PRC Department of Automatic Control Beijing Institute of Technology Beijing 100081 PRC

In this paper, an adaptive fuzzy robust feedback control approach is proposed for a class of single-input and singleoutput （SISO） strict-feedback nonlinear systems with unknown nonlinear functions, time delays, unknown high-frequency gain sign, and without the measurements of the states. In the backstepping recursive design, fuzzy logic systems are employed to approximate the unknown smooth nonlinear functions, K-filters is designed to estimate the unmeasured states, and Nussbaum gain functions are introduced to solve the problem of unknown sign of high-frequency gain. By combining adaptive fuzzy control theory and adaptive backstepping design, a stable adaptive fuzzy output feedback control scheme is developed. It has been proven that the proposed adaptive fuzzy robust control approach can guarantee that all the signals of the closed-loop system are uniformly ultimately bounded and the tracking error can converge to a small neighborhood of the origin by appropriately choosing design parameters. Simulation results have shown the effectiveness of the proposed method.

关键词： Nonlinear systems adaptive fuzzy control time-delay high-frequency gain sign backstepping K-filters stability.

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