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Search Results: 1 - 10 of 567396 matches for " <br>王贤华 "
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Molluscicidal efficacy of Nerium indicum cardiac glycosides on Pomacea canaliculata and its effects on rice seedling
夹竹桃皂甙对福寿螺的毒杀效果及其对水稻幼苗的影响

DAI Lingpeng,LUO Weihua,WANG Wanxian,<br>戴灵鹏,罗蔚,
生态学报 , 2011,
Abstract: P.canaliculata is now a major rice pest in Asia.For snail management,it is therefore imperative to develop an effective and practical method which is relatively safe to the non-target organisms and to the environment.Recently much attention has been given to study the molluscicides from plants,because they might provide effective,locally produced,biodegradable and environment-friendly approach for controlling snail.In this study,cardiac glycosides from the fresh leaves of N.indicum were isolated and 100 g f...
ON THERMAL FLUCTUATIONS IN A JOSEPHSON-FLUXON OSCILLATOR
Josephson磁通孤子振荡器中热噪声研究

WANG QIANG-HUA,YAO XI-XIAN,<br>,姚希
物理学报 , 1993,
Abstract: Thermal fluctuations in a Josephson-fluxon oscillator are considered with emphasises on the stochastic dynamics of fluxon and the non-trivial continuum-mode excitations. Analytical expressions for the radiation line-width of the oscillator are derived from perturbation theory and standard stochastic process theory. The averaged kinetic energy of a low-velocity fluxon is shown to be kBT/2. The continuum excitations are explored in the framework of the inverse scattering transform approach. The averaged energy per wave mode turns out to be kBT,and this justifies the adiabatic approximation applied in the fluxon stochastic dynamics.
DYNAMICS OF ROTATIONALLY SYMMETRIC SINE-GORDON SOL1TONS WITH APPLLCATIONS FOR A LARGE AREA JOSEPHSON JUNCTION
sine-Gordon模型中旋转对称孤子解的动力学及其在大面积Josephson结方面的应用

WANG QIANG-HUA,YAO XI-XIAN,<br>,姚希
物理学报 , 1993,
Abstract: 用集体坐标和拉格朗日变分原理为基础的微扰论处理了n+1维旋转对称的sine-Gordon孤子在远离原点处受微扰势作用下的行为。强调孤子的粒子性并从正则方法导出其依赖于位置的广义动量和运动方程。这一方法可以处理一类相当广泛的微扰势而无需其具体形式即可定性地讨论孤子的行为。在无耗散条件下,研究了孤子的速度-位置相空间的特性,分析了诸如回波效应、不稳定不动点和逃逸等各种可能的现象。引入耗散后,得到了修正的运动方程。还讨论了上述结果在大面积Josephson结方面的应用,并与数值计算的结果作了比较,两者符合较好。
Finite-Time Control for Permanent Magnet Synchronous Motor Position Tracking System
永磁同步电机伺服系统的有限时间位置控制

LIU Huixian,WANG Zhao,LI Shihua,<br>刘慧,,李世
系统科学与数学 , 2010,
Abstract: This paper investigates the problem of position tracking of Permanent Magnet Synchronous Motor (PMSM) servo system. On the basis of analyzing the mathematical model of the PMSM, the exact linearization and decoupling of the motor model can be achieved by using the feedback-linearization technique. First, the PMSM position tracking system is transformed to two linear control subsystems by using the feedback linearization. The corresponding finite-timecontrollers are designed respectively for the two subsystems, and a load estimator based on finite time control is developed to observe and estimate the external load disturbance. The analysis of stability is given for the PMSM closed-loop system. Compared with the corresponding asymptotically stable control method, the scheme based on the finite-time control can track the desired positionsignal in finite-time and obtain a better dynamic response and anti-disturbance performance. The simulation results illustrate the effectiveness of the control scheme.
HIGH EFFICIENCY Nd: YVO_4 LASER END-PUMPED BY DIODE LASER
LD泵浦的高效掺钕钒酸钇(Nd^3+:YVO4)激光器

Du Geguo,Wang Xianhua,Chen Guofu,<br>杜戈果,
光子学报 , 1998,
Abstract: Experimental results for LD pumped Nd: YVO4 laser with an ordinary plain-plain resonator are reported here. Laser output of 4.95W is obtained at pump power of 10. 6 W, resulting in slope efficiency of 53. 8%. We also get a slope efficiency: as high as 55.68%. Experimental results are also discussed.
DEVELOPMENT OF MATERIAL DAMAGE FUNCTION FOR ACID DEPOSITION
酸沉降对材料破坏的损伤函数的研究

Wang Wenxing,Hong Shaoxian,Zhang Wanhua,<br>文兴,洪少,张婉
环境科学学报 , 1995,
Abstract: aterial damage function has been developed for calculating corrosion rate of specificmaterials and relevant service-life under different pollution levels on evaluation of economiclosses of material damage due to acid deposition. A series of experiments under differentconcentrations of SO2 and H+ have been conducted in the simulated environmental units spe-cially designed and constructed.Regression analysis has been performed with the resultingdata.The dualistic damage function of carbonate steel, galvanized steel,aluminum,marbleand paint have been developed by combining field exposure experiment results and the addi-tive contribution from corrosion. The errors are found to be 2%-38%. The separate con-tribution of acid deposition of corrosion rate is also given.
CIRCULARLY SYMMETRIC SOLITON SOLUTION IN AN ANNULAR JOSEPHSON JUNCTION
环形Josephson结中圆对称孤子解的微扰分析

WANG QIANG-HUA,WANG WEI,YAO XI-XIAN,<br>,,姚希
物理学报 , 1991,
Abstract: We have analysed the circularly symmetric sine-Gordon equation with bias and dissipation by means of a simplified perturbation theory. Analytic solutions that describe the dynamical behaviour of a quasisoliton trapped within the annular junction have been obtained. Between the results of our theory and numerical simulation, there exists a good agreement for the first zero field step (ZFS) in the l-V characteristic. A brief discussion of our results is also presented.
RETURNING EFFECT AND THE FIRST ZERO FIELD STEP IN AN ANNULAR JOSEPHSON JUNCTION
环形Josephson结中的回波效应与第一零场台阶的下限偏置电流

WANG QIANG-HUA,WANG WEI,YAO XI-XIAN,<br>,,姚希
物理学报 , 1992,
Abstract: The returning effect of soliton in an annular Josephson junction is analysed in detail theoretically. Some results are compared with directly numerical simulation ones. To avoid the return effect of soliton, the conditions which relate to the minimum bias current of the first zero step of annular junctions with different geometric and dissipative parameters are discussed. A disscusion of the difference between in-line and annular junction is also made.
Analysis of Agent''''s and Enterprise''''s Sales Activities
营销代理商与企业的营销活动分析

WANG Xian-yu,YANG Xue-nan,WANG Hua,<br>汪,杨学南,
系统工程理论与实践 , 2004,
Abstract: We study on agents' and enterprise's sales activities under complete information. Firstly, if the enterprise has no sales agents, leader\|follows game model of the management and sales department are established. The, if the enterprise has its sales agents, second\|degree leader\|follows model of the management, sales department and sales agents are analysied. By comparing the results under the two different situations, we illuminate that it is profitable for the management, sales department and agents to entrust part of the products to agents. And we also explain the mechanism and reasons of agents' participation in sales activities.
OBSERVATION OF THE STABILITY OF ALL FIBER FEMTO-SECOND LAMP-HOUSE
稳定的全光纤飞秒激光光源

Chen Guofu,<br>陈国夫,,刘东峰,白晋涛,廖信仪
光子学报 , 2001,
Abstract: 我们在实验上研究了掺Er^3 全光纤飞秒激光器的稳定性,得到了令人极其满意的结果。锁模脉冲串如一幅图画贴在荧光屏上,一整天也不飘动,激光器的结构是环形腔,用输出功率为56mW,波长为980nm带尾纤的二级管激光器泵浦时,双路输出分别为194μW和97μW,激光器的阈值14.8mW,脉宽260fs,中心波长1.531μm,重复频率21.3MHz,光谱宽度33.6nm,说明可以产生很短的脉冲,这激光器小型、稳定、可靠、胜任广,它是传感器和光通讯的好光源,在科研领域具有潜在的用途。
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