摘要：
J. Y. Park and T. G. Ha [Nonlinear Anal., 2008, 68: 747-767; 2009, 71: 3203-3217] investigated the existence of anti-periodic solutions for hemivariational inequalities with a pseudomonotone operator. In this note, we point out that the methods used there are not suitable for the proof of the existence of anti-periodic solutions for hemivariational inequalities and we shall give a straightforward approach to handle these problems. The main tools in our study are the maximal monotone property of the derivative operator with antiperiodic conditions and the surjectivity result for L-pseudomonotone operators.
摘要：
Graphene nanoribbons (GNRs) recently have drawn much interest because of their novel electronic properties such as well-controlled electronic structures, high Seebeck coefficient, and intriguing electronic transport. For the thermoelectric energy conversion, GNRs are thought to be rather poor candidates because of too high phonon thermal conductance, though they own good electronic conduction. Thus, the reduction of the phonon thermal conductance of GNRs is particularly important for their thermoelectric applications. Several methods such as strain, structural defects, etc., have been proposed to reduce the phonon thermal conductance of GNRs. In these methods, however, a central difficulty is that reducing the phonon thermal conductance always brings the adverse effects to the electron transport, which limits the further improvement of the thermoelectric efficiency of GNRs.
作者机构：
[饶益花] School of Mathematics and Physics, University of South China, Hengyang;421001, China;[陈文光; 胡波] School of Electrical Engineering, University of South China, Hengyang;[饶军; 余珮炫; 曹建勇] China Southwestern Institute of Physics, Chengdu;610041, China
通讯机构：
[Chen, W.] S;School of Electrical Engineering, University of South China, Hengyang, China
摘要：
In this paper, based on the two-potential approach combining with the isospin dependent nuclear potential, we systematically compare the α preformation probabilities of odd-A nuclei between nuclear isomeric states and ground states. The results indicate that during the process of α particle preforming, the low lying nuclear isomeric states are similar to ground states. Meanwhile, in the framework of single nucleon energy level structure, we find that for nuclei with nucleon number below the magic numbers, the α preformation probabilities of high-spin states seem to be larger than low ones. For nuclei with nucleon number above the magic numbers, the α preformation probabilities of isomeric states are larger than those of ground states.
作者机构：
[饶益花] School of Mathematics and Physics, University of South China, Hengyang, 421001, China;[冯鲲; 饶军; 康自华] Southwestern Institute of Physics, Chengdu, 610041, China;[陈文光; 胡波] School of Electrical Engineering, University of South China, Hengyang, 421001, China
通讯机构：
School of Electrical Engineering, University of South China, Hengyang, China
关键词：
回旋管;电子回旋共振加热;脉冲步进调制;高压电源;控制系统
摘要：
电子回旋共振管是产生高功率毫米微波的真空电子器件，在可控热核聚变研究、雷达等领域中有重要的应用。针对可控热核聚变研究中1 M W／105 G Hz回旋管加热系统阳极电源幅度可调且调制的要求，使用高频开关电源技术和脉冲步进调制技术（PSM ）研制了全固态阳极高压电源。重点阐述了阳极高压电源实现稳压、调制、前沿时间可调功能的软件控制算法，并通过实验对设计进行了验证。该阳极高压电源具有单脉冲、多脉冲调制和六电平预置波形等3种模式输出功能；输出参数达到35 kV／200 mA ，波形前沿3 ms内可调，最大调制频率为1 kHz ，调节精度在100 V以内。设计的控制方法也可应用于其他大功率微波源。
作者机构：
[Yin Lan; Du Dan] Univ South China, Dept Math & Phys, Hengyang 421001, Peoples R China.;[Gong Xueyu; Xiang Dong; Li Jingchun] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Gong Xueyu] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
ICRH antenna;impedance matching;transmission line theory
摘要：
The impedance matching is crucial for continuous wave operation of ion cyclotron resonance heating (ICRH) antennae with high power injection into plasmas. A sudden increase in the reflected radio frequency power due to an impedance mismatch of the ICRH system is an issue which must be solved for present-day and future fusion reactors. This paper presents a method for theoretical analysis of ICRH system impedance matching for a triple liquid stub tuner under plasma operational conditions. The relationship of the antenna input impedance with the plasma parameters and operating frequency is first obtained using a global solution. Then, the relations of the plasma parameters and operating frequency with the matching liquid heights are indirectly obtained through numerical simulation according to transmission line theory and matching conditions. The method provides an alternative theoretical method, rather than measurements, to study triple liquid stub tuner impedance matching for ICRH, which may be beneficial for the design of ICRH systems on tokamaks.
作者机构：
[余江妹; 谢宝艺; 张能] School of Mathematics and Physics, University of South China, Hengyang, 421001, China;[龚学余] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China
