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Search Results: 1 - 10 of 130651 matches for " Li-Sen; "
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Hopf bifurcation and chaotification of Josephson junction with linear delayed feedback
线性延时反馈Josephson结的Hopf分岔和混沌化

Zhang Li-Sen,Cai Li,Feng Chao-Wen,
张立森
,蔡理,冯朝文

物理学报 , 2011,
Abstract: In this paper, a resistive-capacitive-shunted Josephson junction with linear delayed feedback is considered. The stability of trivial solution of the controlled system is analyzed using nonlinear dynamics theory, and the theoretical results show that the stable trivial solution of the system will lose its stability via Hopf bifurcation as control parameter varies. The critical parameter condition of Hopf bifurcation is also derived. Numerical analysis of the controlled system is carried out under different parameter conditions, and the results show that the stable periodic solution generated by supercritical Hopf bifurcation may transit to chaos gradually through a process of symmetry-breaking bifurcation and period-doubling bifurcation.
Analytical analysis of periodic solution and its stability in Josephson junction
约瑟夫森结中周期解及其稳定性的解析分析

Zhang Li-Sen,Cai Li,Feng Chao-Wen,
张立森
,蔡理,冯朝文

物理学报 , 2011,
Abstract: Analytical expressions of periodic solutions in rf-biased resistively-capacitively-shunted Josephson junction were derived by incremental harmonic balance method, and the stability of the periodic solutions was investigated using Floquet theory. We fownd that while the system is in stable periodic states, plentiful unstable periodic orbits still exist in the system. Critical parameter values for which the stable periodic solutions of the system lose their stability are obtained and the type of bifurcation is determined by computing the Floquet multipliers. We have also theoretically confirmed the period-doubling-route to chaos with increasing amplitude of driving current, which acts as the control parameter in the system. The results from analytical analysis coincide with that from numerical simulation.
Improvement of productivity and polysaccharide-protein complex in Agaricus blazei
Chu, Jiunn-Nan;Young, Chiu-Chung;Tan, Chen-Chung;Wu, Szu-Pei;Young, Li-Sen;
Pesquisa Agropecuária Brasileira , 2012, DOI: 10.1590/S0100-204X2012000100013
Abstract: the objective of this work was to assess the productivity and polysaccharide-protein complex content of agaricus blazei on rice straw medium, in comparison to conventional sawdust, using four casing soils. the a. blazei strain used was bcrc36814t, purchased from the food industry research and development institute, hsin-chu, taiwan. the two media were evaluated as to a. blazei productivity, harvesting time, and production costs. the experimental design used was a randomized complete block, with four replicates. three local casing soils - typic paleudult (cce), typic udorthent (tq) and oxyaquic paleudult (tsp) - were compared to imported peat soil (ps, saprists, histosols), used as the control. the productivity of a. blazei using tq and tsp soil was significantly higher. the tsp casing treatment resulted in earlier harvest by at least 14 to 27 days, when compared to the other treatments. the polysaccharide content in cce (13.2%) and tq soils (13.2%) did not differ significantly from the ps (13.4%) and tsp (10.6%) treatments. local casing soils decreased the production costs of a. blazei cultivation. composted rice straw can substitute sawdust as the culture medium for a. blazei production with increased yield.
A novel three-dimensional autonomous chaotic system
一种新的三维自治混沌系统

Feng Chao-Wen,Cai Li,Kang Qiang,Zhang Li-Sen,
冯朝文
,蔡理,康强,张立森

物理学报 , 2011,
Abstract: 通过对蔡氏电路的研究,提出了一种新的混沌系统,并对该系统的基本动力学特性进行了深入研究,得到该系统的Lyapunov指数和Lyapunov维数,给出了相图、Lyapunov指数谱、分岔图、Poincaré映射以及功率谱等.利用OrCAD-PSpice软件设计了该新混沌系统的振荡电路并进行了仿真实验.研究结果表明,该系统与蔡氏电路产生的混沌吸引子并不拓扑等价,且该系统的参数变化范围较大,最大Lyapunov指数接近1,数值仿真和电路系统实验仿真具有很好的一致性,证实了该系统的存在性和物理上可实现性.
The Field Entropy Evolution of the Binomial Optical Field Interacting with the Atom Under Instrinsic Decoherece Condition
内禀退相干下二项式光场与原子互作用的场熵演化

CUI Ying-hua,SACHUERFU,YANG li-sen,GONG Yan-li,
崔英华
,萨楚尔夫,杨立森,宫艳丽

光子学报 , 2009,
Abstract: 通过求解系统的Milburn 方程,研究了二项式光场与二能级原子相互作用系统中的场熵演化特性,讨论了内禀退相干、二项式光场系数和场的最大光子数对场熵演化的影响.结果表明二项式光场处于中间态时,由于内禀退相干,场熵振荡准周期性减弱,并随着时间的演化,场与原子纠缠逐渐趋近于一个定值,说明存在內禀退相干时,场与原子仍能纠缠;当內禀退相干因子不变时,二项式光场从相干态过渡到中间态,直至数态过程中,场熵值减小,场与原子的纠缠减弱.
DD3单晶合金的评估
唐定中,叶国胜,吴仲堂,吴学仁,Li-sen(Jim),LinA.D.Cetel,D.N.Duhl
材料工程 , 1997,
Abstract: 叙述了北京航空材料研究院(BIAM)和美国普拉特惠特尼公司(Pratt&Whitney)对DD3单晶合金的成本、主要力学性能指标和单晶铸造性能进行的评估。评估认为DD3合金有优良的力学性能和良好的铸造性能,与第一代单晶合金PWA1480合金相当,且适合低成本生产,是一种很有推广应用价值的航空发动机单晶涡轮叶片材料。
Switching behavior of logic circuits by magnetic quantum cellular automata
磁性量子元胞自动机逻辑电路的转换特性研究

Yang Xiao-Kuo,Cai Li,Kang Qiang,Bai Peng,Zhao Xiao-Hui,Feng Chao-Wen,Zhang Li-Sen,
杨晓阔
,蔡理,康强,柏鹏,赵晓辉,冯朝文,张立森

物理学报 , 2011,
Abstract: In this paper, switching behaviors of MQCA inverter and majority logic gate with various nanomagnet thicknesses and spacings are studied. Single domain approximation Landau-Lifshitz-Gilbert equation is employed to model and simulate the circuits. It is shown that thicker nanomagnet needs larger switching magnetic pulse and logic circuits comprised of thicker nanomagnet demonstrate slower switching; majority logic gate needs more time to switch than inverter when they have the same nanomagnet thicknesses and spacings. Moreover, it is also shown that nanomagnet spacing has a larger effect on switching behavior of inverter than on majority logic gate.
Implementation of multi-scroll Chua''s circuit by hybrid single electron transistor and metal oxide semiconductor structure
SETMOS实现多涡卷蔡氏电路的研究

Feng Chao-Wen,Cai Li,Zhang Li-Sen,Yang Xiao-Kuo,Zhao Xiao-Hui,
冯朝文
,蔡理,张立森,杨晓阔,赵晓辉

物理学报 , 2010,
Abstract: 利用拟合法简化了单电子晶体管与金属氧化物半导体混合结构器件SETMOS的负微分电阻特性方程,提出了由SETMOS设计多涡卷混沌电路的方法.理论上定性和定量地分析了负微分电阻特性对于多涡卷蔡氏电路平衡点的影响.经研究发现,多涡卷蔡氏电路混沌在非线性函数的各负斜率区中形成径向收缩、轴向拉伸的单向运动,而在各正斜率区中形成径向拉伸、轴向收缩的涡卷运动.这为进一步实现多涡卷电路及研究其复杂动力学行为提供了理论基础.
A STUDY ON REAL-TIME LOW-FREQUENCY SPATIAL FILTERING PROCESS OF AN OPTICAL IMAGE USING LiNbO3:Fe CRYSTAL

LIU SI-MIN,LU YI,CHEN HAI-DONG,LIU JUN-MIN,XU JING-JUN,ZHANG GUANG-YIN,YANG LI-SEN,MEN LI-QIU,SUN QIAN,

中国物理 B , 1994,
Abstract: The optimum image processing result of low-frequency filtering was obtained when LiNbO3:Fe crystal as a spatial filter was placed at a certain position behind the spatial-frequency spectral plane of an optical Fourier transform system, which corresponds to the minimum transmittance ratio in Z-scan curve. The experimental results show that self-defocusing due to photorefractive negative-lens effect is the main factor responsible for the low- frequency filtering.
One-dimensional photovoltaic dark spatial solitons with fully incoherent white light
完全非相干白光一维光生伏打暗空间孤子

Lu Yi,Liu Si-Min,Guo Ru,Yang Li-Sen,Huang Chun-Fu,Wang Da-Yun,
陆猗
,刘思敏,郭儒,杨立森,黄春福,汪大云

物理学报 , 2003,
Abstract: 使用白炽灯作光源在LiNbO3∶Fe晶体内实验观察到一维白光光生伏打暗空间孤 子. 由奇数 和偶数初始条件分别产生了灰孤子和灰孤子对,它们所感应的波导能导向白光和相干光. 用 相干光清楚地探测到它们内部的多模结构. 该实验证明了白光光生伏打暗空间孤子的存在, 并指出了用完全非相干的白光暗孤子控制和导向相干光的可能性.
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