作者机构：
[Li, Zong-Hai] Southwest Jiaotong Univ, Sch Phys Sci & Technol, Chengdu 610031, Peoples R China.;[Zhou, Xia] China West Normal Univ, Phys & Space Sci Coll, Nanchong 637009, Peoples R China.;[Li, Wei-Jun; He, Guan-Sheng] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
通讯机构：
[He, Guan-Sheng] U;Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
关键词：
gravitational deflection;relativistic massive particles;radiation gauge;Schwarzschild black hole
摘要：
The exact metric of a Schwarzschild black hole in the true radiation gauge was recently reported. In this work, we base on this gravity and calculate the gravitational deflection of relativistic massive particles up to the fourth post-Minkowskian order. It is found that the result is consistent with the previous formulations for both the case of dropping the fourth-order contribution and the case of light deflection. Our result might be helpful for future high-accuracy observations.
摘要：
Adsorption and desorption of hydrogen on/from single-vacancy and double-vacancy graphenes were studied by means of first-principles calculations. The structure and stability of continuous hydrogenation in single vacancy were investigated. Several new stable structures were found, along with their corresponding energy barriers. In double-vacancy graphene, the preferred sites of H atoms were identified, and H2 molecule desorption and adsorption of from/on were calculated from the energy barriers. This work provides a systematic and comprehensive understanding of hydrogen behavior on defected graphene.
摘要：
We derive a more generally parameterized post-post-Newtonian solution for the light propagation in the gravitational field of one spherically-symmetric body. Based on the solution for the light velocity, we give the formula of the light deflection when both the emitter and receiver are located in the regions far away from the body, which is the most important scenario in the real applications. Our results can be applied to more metric theories of gravitation.
作者机构：
[Li, Xiao-Hua; Zhao, Jie-Cheng; Deng, Jun-Gang; Chen, Jiu-Long] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Wu, Xi-Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Wu, Xi-Jun] U;Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
关键词：
a decay;~(296)Og;hindrance factor;two-potential approach
摘要：
The present work is a continuation of our previous paper [J.-G. Deng, et al., Chin. Phys. C, 41: 124109 (2017)]. In the present work, the a decay half-life of the unknown nucleus 2960g is predicted within the two-potential approach and the hindrance factors of all 20 even-even nuclei in the same region as ~(296)Og, i.e. proton number 82<Z<126 and neutron number 152<N<184, from ~(250)Cm to ~(294)Og, are extracted. The prediction is 1.09 ms within a factor of 5.12. In addition, based on the latest experimental data, a new set of parameters of a decay hindrance factors for the even-even nuclei in this region, considering the shell effect and proton-neutron interaction, are obtained.
关键词：
laminar flow;asymmetric flow;asymptotic solution;porous and retractable channel;magnetic field
摘要：
The self-similarity solutions of the Navier-Stokes equations are constructed for an incompressible laminar flow through a uniformly porous channel with retractable walls under a transverse magnetic field. The flow is driven by the expanding or contracting walls with different permeability. The velocities of the asymmetric flow at the upper and lower walls are different in not only the magnitude but also the direction. The asymptotic solutions are well constructed with the method of boundary layer correction in two cases with large Reynolds numbers, i.e., both walls of the channel are with suction, and one of the walls is with injection while the other one is with suction. For small Reynolds number cases, the double perturbation method is used to construct the asymptotic solution. All the asymptotic results are finally verified by numerical results.
作者机构：
[刘卫; 王广华] Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai, 201800, China;University of Chinese Academy of Sciences, Beijing, 100049, China;[吴喜军] College of Maths and Physics, University of South China, Hengyang, 421001, China;[秦来来; 马兆伟; 杨果; 邓珂; 马玉华; 刘佳煜; 张钦; 卫飞] Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai, 201800, China, University of Chinese Academy of Sciences, Beijing, 100049, China
通讯机构：
[Liu, W.] S;Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai, China
摘要：
A novel data-driven method based on Gaussian mixture model (GMM) and distance evaluation technique (DET) is proposed to predict the remaining useful life (RUL) of rolling bearings. The data sets are clustered by GMM to divide all data sets into several health states adaptively and reasonably. The number of clusters is determined by the minimum description length principle. Thus, either the health state of the data sets or the number of the states is obtained automatically. Meanwhile, the abnormal data sets can be recognized during the clustering process and removed from the training data sets. After obtaining the health states, appropriate features are selected by DET for increasing the classification and prediction accuracy. In the prediction process, each vibration signal is decomposed into several components by empirical mode decomposition. Some common statistical parameters of the components are calculated first and then the features are clustered using GMM to divide the data sets into several health states and remove the abnormal data sets. Thereafter, appropriate statistical parameters of the generated components are selected using DET. Finally, least squares support vector machine is utilized to predict the RUL of rolling bearings. Experimental results indicate that the proposed method reliably predicts the RUL of rolling bearings.
作者机构：
[王忠康; 顾晓薇; 胥孝川] School of Resources & Civil Engineering, Northeastern University, Shenyang;110819, China;[谢婷] School of Mathematics and Physics, University of South China, Hengyang;421001, China;[王忠康; 顾晓薇; 胥孝川] 110819, China
通讯机构：
[Gu, X.-W.] S;School of Resources & Civil Engineering, Northeastern University, Shenyang, China
