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Search Results: 1 - 10 of 144892 matches for " Zhang Xin-Jun "
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Preparation of Trititanate Nanotube and TEM Observation
钛酸纳米管的制备及 TEM表征

HUANG Cong,ZHANG Kai-Jian,DANG Zhi,Li Xin-Jun,

无机材料学报 , 2006,
Abstract: 采用水热合成法以金红石型纳米TiO2粉为原料制备钛酸纳米管,考察了搅拌、酸洗及焙烧温度对纳米管的形成和结构的影响,并通过TEM观察了产物的形貌、结构.结果显示:持续搅拌能促进原料粉末的定向生长,有利于形成钛酸纳米片;酸洗是纳米管的形成阶段;300℃是纳米管转变为长棒状晶柱的临界温度.实验表明以优化的水热合成法制得的纳米管形貌均一,长度超过1μm,钛酸纳米管长径比为125:1.
Intensity modulation characters of orthogonally polarized HeNe lasers with different optical feedback level
Cui Liu,Zhang Shu-Lian,Wan Xin-Jun,
崔 柳

中国物理 B , 2008,
Abstract: This paper demonstrates the intensity modulation characters of orthogonally polarized HeNe lasers with different optical feedback level generated by the variable reflectivity of external reflector. The modulation depths of the orthogonally polarized frequencies are increased when the optical feedback level becomes strong. It also observes that the modulation amplitudes are different for different external cavity length. Based on the vectorial extension of Lamb's semi-classical theory, it finds that the calculations are consistent with the experimental results.
A new electromagnetic code for ICRF antenna in EAST
Hua Yang,Cong-Feng Wu,Sa Dong,Xin-Jun Zhang,Yan-Ping Zhao,Lei Shang
Physics , 2015,
Abstract: The demand for an effective tool to help in the design of ion cyclotron radio frequency (ICRF) antenna system for fusion experiment has driven the development of predictive codes. A new electromagnetic code based on the method of moments (MOM) is described in the paper. The code computes the electromagnetic field by the solution of the electric field integral equation. The structure of ICRF antennas are discretized with triangular mesh. By using the new code, the scattering parameter and the surface current are given and compared with the result by commercial code CST. Moreover, the power spectra are studied with different toroidal phases for heating and current drive. Good agreement of simulation results between the new code and CST are obtained. The code has been validated against CST for EAST ICRF antenna.
Optical feedback characteristics in a helium neon laser with a birefringent internal cavity
Mao Wei,Zhang Shu-Lian,Xu Ting,Wan Xin-Jun,Liu Gang,
毛 威
,张书练,徐 亭,万新军,刘 刚

中国物理 B , 2007,
Abstract: The output characteristics of optical feedback in a helium neon laser with a birefringent internal cavity are studied systematically in five different regions of the gain curve for the two orthogonally polarized modes. When the laser operates in the two end regions of the laser gain curve, one of the two orthogonally polarized modes will be a leading one in optical feedback. Strong mode competition can be observed. However, when the laser operates in the middle region of the laser gain curve, the two modes can oscillate equally with optical feedback. Besides the intensity of the two polarized lights, the total light intensity is also studied at the same time. M-shaped optical feedback curves are found. Particularly, when the average intensities of the two lights are comparable, the intensity modulation curve of the total light is doubled, which can be used to improve the resolution of an optical feedback system.第一段]
Neutron Flux Measurements in an ICRF Mode Conversion Regime Heating Plasmas on HT-7

LI Xiao-Ling,WAN Bao-Nian,ZHONG Guo-Qiang,HU Li-Qun,LIN Shi-Yao,ZHANG Xin-Jun,ZANG Qing,

中国物理快报 , 2011,
Theoretical analysis of ion cyclotron range of frequency antenna array for HT-7U
Zhang Xin-Jun,Qin Cheng-Ming,Zhao Yan-Ping,

中国物理 B , 2005,
Abstract: This paper considers the coupling analysis of phased antenna array designed to excite fast wave in the ion cyclotron range of frequency. The coupling of the antenna is calculated in slab geometry. The coupling code based on the variational principle gives the self-consistent current flowing in the antenna, this method has been extended so that it can be applied to a phased antenna array. As an example, this paper analyses the coupling prosperities of a 2×2 phased antenna array. It gives the optimum geometry of antenna array. The fields excited at plasma surface are found to more or less correspond to the antenna current phasing.
Mode hopping in single-mode microchip Nd:YAG lasers induced by optical feedback
Mode hopping in single-mode microchip Nd:YAG lasers induced by optical feedback

Tan Yi-Dong,Zhang Shu-Lian,Wan Xin-Jun,Cheng Xiang,
,张书练,万新军,程 翔

中国物理 B , 2006,
Abstract: The mode hopping phenomenon induced by optical feedback in single-mode microchip Nd:YAG lasers is presented. With optical feedback, mode hopping strongly depends on two factors: the ratio of external cavity length to intra-cavity length, and initial gains of the two hopping modes. When external cavity length equals an integral multiple of intra-cavity length, there is almost no mode hopping. However, if the external cavity length does not equal an integral multiple of intra-cavity length, mode hopping occurs. The ratio of external cavity length to intra-cavity length determines the position of two-mode hopping. The initial gains of the two hopping modes determine the corresponding peak values and oscillating periods of them in the intensity modulation curves.
State-of-the-Art,Challenges and Perspectives of Agent-oriented Software Engineering

MAO Xin-jun,

计算机科学 , 2011,
Abstract: Agent oriented software engineering is a novel software paradigm that is considered as an important approach to supporting the development of complex software systems based on agent technology. Many attentions had been paid by researchers in academic literature and practitioners in industry literature. In the past ten years,great progresses of Agent oriented software engineering has been made. However, there are still a great number of problems that should be solved before it moves to industry application and its potentials should be exploited extensively. After investigating the background and characteristics of agent oriented software engineering, the paper overviewed the statcof-thcart of the researches on agent-oriented software engineering, identified and analyzed a number of key challenges of such technology, outlooked and discussed the future directions from technique, process and tool viewpoints.
Future scenarios analysis of social-ecological system in semiarid areas of Northwest China: A case study of northern highlands in Yuzhong County of Gansu Province

WANG Jun,ZHANG Xiang-long,YANG Xin-jun,LIU Wen-zhao,WANG Xing-yu,

生态学杂志 , 2009,
Abstract: 以甘肃省榆中县北部山区为例,运用情景分析法对半干旱区社会-生态系统未来情景进行了分析。在相关利益主体情景访谈的基础上,确定了干旱扰动下的社会-生态系统未来变化的情景主题,通过系统驱动力分析确定了情景逻辑空间,选取了表征社会-生态系统未来发展的关键因素和关键事件,运用交叉影响分析计算出由关键事件组合的情景概率。结果表明,概率最大的3种情景内涵从属于关键驱动力所确定的情景逻辑空间,并由此展开了榆中北部山区社会-生态系统在2020年的3个发展情景,提出了系统向理想情景发展的决策建议。
Study on synergy of electron-cyclotron and lower-hybrid current drive in Tokamak

Hong Bin-Bin,Chen Shao-Yong,Tang Chang-Jian,Zhang Xin-Jun,Hu You-Jun,

物理学报 , 2012,
Abstract: The mechanisms of the synergy effects between electron-cyclotron and lower-hybrid current drive and the synergy current are revealed. The matching relationships required by synergy effect in phase space and on current profile are explained. The non-linear relationship between synergy current and wave power is shown by computer simulation, and its physical explanation is given. This work provides physical support for the design and analysis of relevant experiment.
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