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991.
Bergerson WF Auriemma F Chapman BE Ding WX Zanca P Brower DL Innocente P Lin L Lorenzini R Martines E Momo B Sarff JS Terranova D 《Physical review letters》2011,107(25):255001
We report the first direct measurement of the internal magnetic field structure associated with a 3D helical equilibrium generated spontaneously in the core of an axisymmetric toroidal plasma containment device. Magnetohydrodynamic equilibrium bifurcation occurs in a reversed-field pinch when the innermost resonant magnetic perturbation grows to a large amplitude, reaching up to 8% of the mean field strength. Magnetic topology evolution is determined by measuring the Faraday effect, revealing that, as the perturbation grows, toroidal symmetry is broken and a helical equilibrium is established. 相似文献
992.
针对超高压下透明材料的高压离化机理,分析了透明材料中冲击波直接诊断技术的基本方法。利用Drude自由电子气模型,分析了不同冲击压力下冲击波阵面反射率的变化。设计了专门的实验,将探测器致盲区与信号区错开,获得了蓝宝石中冲击波阵面反射的信号。结果表明:冲击波速度为32 km/s时,其波阵面的反射率约为35%,致盲效应出现时间与激光脉冲峰值到达时刻相同,持续时间也与激光脉宽相同。分析了致盲应产生的原因,并提出了解决办法。给出了加蓝宝石窗口后的测速公式,经过和实验对比,确认了测速公式的正确性。 相似文献
993.
为了提高超宽带系统的辐射因子,对超宽带脉冲整形技术进行了深入研究,介绍了采用Blumlein线产生双极脉冲的高功率双极脉冲产生技术。对采用Blumlein线产生双极脉冲的原理进行了讨论,通过数值模拟分析了影响双极脉冲形成的主要因素。设计了一套Blumlein高功率双极脉冲形成线,在800 kV脉冲源上开展了高压实验研究,分析了开关及形成线长度对形双极脉冲的影响。在输入单极脉冲电压为652.0 kV、脉宽为2.1 ns的情况下,Blumlein双极脉冲形成线可以产生负峰电压为571.9 kV、正峰电压为550.4 kV、半周期为740 ps的双极脉冲,峰-峰值电压是入射脉冲峰值电压的1.72倍,辐射因子为4.54 MV。 相似文献
994.
微波电真空器件随着频率的升高,不但聚焦系统难以实现,而且其输出增益和带宽都受到很大的限制,要解决该问题,建议采用扩展互作用速调管,采用分布作用谐振腔技术来扩展其工作带宽和提高增益。利用CST和粒子模拟(PIC)3维软件对其工作在Ku波段扩展互作用速调管进行了设计和仿真,在工作电压30 kV、束流8.5 A的条件下,聚焦系统采用幅值为0.48 T的周期反转永磁聚焦,在输入功率为5.1 W时,得到效率为23%,3 dB带宽为306 MHz,频带内最大增益为39 dB,其峰值功率为58 kW的微波输出。 相似文献
995.
996.
997.
The influence of the width of a lattice-matched Al0.82In0.18N/GaN single quantum well (SQW) on the absorption coefficients and wavelength of the intersubband transition (ISBT) has been investigated by solving the Schrödinger and Poisson equations self-consistently. The wavelength of 1—2 ISBT increases with L, the thickness of the single quantum well, ranging from 2.88 μm to 3.59 μm. The absorption coefficients of 1—2 ISBT increase with L at first and then decrease with L, with a maximum when L is equal to 2.6 nm. The wavelength of 1—3 ISBT decreases with L at first and then increases with L, with a minimum when L is equal to 4 nm, ranging from approximately 2.03 μm to near 2.11 μm. The absorption coefficients of 1—3 ISBT decrease with L. The results indicate that mid-infrared can be realized by the Al0.82In0.18N/GaN SQW. In addition, the wavelength and absorption coefficients of ISBT can be adjusted by changing the width of the SQW. 相似文献
998.
Noise-induced synchronous stochastic oscillations small scale cultured heart-cell networks
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Yuan Lan Liu Zhi-Qiang Zhang Hui-Min Ding Xue-Li Yang Ming-Hao Gu Hua-Guang Ren Wei 《中国物理 B》2011,(2):133-147
This paper reports that the synchronous integer multiple oscillations of heart-cell networks or clusters are observed in the biology experiment. The behaviour of the integer multiple rhythm is a transition between super- and sub- threshold oscillations, the stochastic mechanism of the transition is identified. The similar synchronized oscillations are theoretically reproduced in the stochastic network composed of heterogeneous cells whose behaviours are chosen as excitable or oscillatory states near a Hopf bifurcation point. The parameter regions of coupling strength and noise density that the complex oscillatory rhythms can be simulated are identified. The results show that the rhythm results from a simple stochastic alternating process between super- and sub-threshold oscillations. Studies on single heart cells forming these clusters reveal excitable or oscillatory state nearby a Hopf bifurcation point underpinning the stochastic alternation. In discussion, the results are related to some abnormal heartbeat rhythms such as the sinus arrest. 相似文献
999.
H. B. Zhou X. H. Zhou Y. H. Zhang Y. Zheng M. L. Liu N. T. Zhang L. Chen S. T. Wang G. S. Li H. X. Wang B. Ding X. G. Lei Y. X. Guo G. X. Dong F. R. Xu M. Oshima Y. Toh M. Koizumi A. Osa Y. Hatsukawa 《The European Physical Journal A - Hadrons and Nuclei》2011,47(9):1-7
High-spin states in 101Pd have been investigated by means of in-beam γ-ray spectroscopic techniques via the 76Ge(28Si, 3n) reaction at beam energies of 85 and 95 MeV. The previously known d 5/2 and 1/2?[550] bands were extended to higher spins, and the unfavored signature branch of the 1/2?[550] band was built. The band crossings observed experimentally are explained by the alignment of g 9/2 protons. The band properties in 101Pd are compared with those in the neighboring nuclei and are discussed within the framework of the cranked shell model (CSM). 相似文献
1000.
X. Y. Lü L. L. Zheng C. L. Ding X. Yang 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2011,63(3):489-494
A scheme is proposed to achieve the two-mode entanglement in an asymmetric semiconductor three-coupled-quantum-well (TCQW)
system based on the intersubband transitions (ISBTs). In the present scheme, the TCQW structure is trapped into a doubly resonant
cavity, and the required quantum coherence effects is induced by the corresponding ISBTs, which is the key of realising entanglement.
By numerically simulating the dynamics of the system, we show that the entangled cavity modes with the far-infrared wavelengh
can be realised in this TCQW system. The present research provides an efficient approach to achieve far-infrared entangled
light in the semiconductor nanostructures, which may have significant impact on the progress of solid-state quantum information
theory. 相似文献