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971.
We investigate the quantum-classical transition of a kicked rotor (KR) under perturbation by a second one. The influence of such a chaotic KR makes decoherence of the first one, resulting in the emergence of classical diffusion from its quantum dynamics. Such quantum-classical transition persists by decreasing the effective Planck's constant h, and at the same time, decreasing the mass of the second KR and the interaction strength proportionally. In the limit of h → 0, due to vanishing small mass and interaction, the second KR has almost no effect on the classieal dynamics of the first one. We demonstrate this via two different coupling potentials. 相似文献
972.
在高温钼丝炉内向16Mn钢中加入不同含量的铈进行脱氧,分析了钢中夹杂物和组织的变化,并探讨了含铈夹杂物诱发晶内铁素体形核的机制.结果表明:随钢中铈含量的增加,夹杂物依次转变为CeAlO3,Ce2O2S和Ce2S3.经铈处理后,钢液在1873 K时保温300 s,夹杂物最为细小弥散.钢中晶内铁素体随铈含量的增加而增加,但最佳的铈含量约为0.032%(质量分数).钢中Ce2O2S和Ce2S3夹杂与α-Fe相之间的错配度分别只有1.2%和0.5%,均可作为IGF非常有效的形核核心,促进其形成. 相似文献
973.
吡唑类化合物是一类具有广泛生物活性的杂环化合物,在医药和农药领域均有商品化的品种问世.在寻找新的吡唑类化合物的过程中,以草酸二乙酯为起始原料,分别与不同的一元酮反应,经过缩合、环合、烷基化、(溴化)、水解,合成了a~d 4个未见文献报道的取代吡唑甲酸乙酯、取代吡唑甲酸中间体,收率78%~90%,结构均经元素分析、1H NMR、MS和IR确证. 相似文献
974.
975.
Jing Han Jin Mao Chen Xiao Wen Zhou Yuan Lin Jing Bo Zhang Jian Guang Jia 《中国化学快报》2008,19(8):1004-1007
The screen-printed nanoporous TiO2 thin film was employed to fabricate dye-sensitized solid-state solar cells using CuI as hole-transport materials. The solar cell based on nanoporous TiO2 thin film with large pores formed by the addition of polystyrene balls with diameter of 200 nm to the TiO2 paste exhibits photovoltaic performance enhancement, which is attributed to the good contact of CuI with surface of dye-sensitized thin film due to easy penetration of CuI in the film with large pores. 相似文献
976.
Static Theory for Planar Ferromagnets and Antiferromagnets 总被引:2,自引:0,他引:2
Here we generalize the “BBH”-asymptotic analysis to a simplified mathematical model for the planar ferromagnets and antiferromagnets.
To develop such a static theory is a necessary step for a rigorous mathematical justification of dynamical laws for the magnetic
vortices formally derived in [1] and [2].
Received March 15, 2001, Accepted May 16, 2001 相似文献
977.
978.
In this paper, we consider a jump-diffusion risk process with the threshold dividend strategy. Both the distributions of the inter-arrival times and the claims are assumed to be in the class of phase-type distributions. The expected discounted dividend function and the Laplace transform of the ruin time are discussed. Motivated by Asmussen [S. Asmussen, Stationary distributions for fluid flow models with or without Brownian noise, Stochastic Models 11 (1) (1995) 21–49], instead of studying the original process, we study the constructed fluid flow process and their closed-form formulas are obtained in terms of matrix expression. Finally, numerical results are provided to illustrate the computation. 相似文献
979.
Tao Yang Xiao Bo Yang Ren Hou Liu En Li Tie Hua Wang Mong Lin Zheng 《International Journal of Infrared and Millimeter Waves》2001,22(2):343-349
In this paper, a new method to realize pre-selected harmonic mixer is introduced. It includes a harmonic mixer, and a YIG turning filter (YTF) design. A digital driver is used for YTF, which can realize linearization modification and temperature compensation. The spectrum analyzer's out scanning voltage is given an A/D conversion and interface to digital driver. 相似文献
980.
Stripping voltammetry analysis using a hemispheroidal mercury microelectrode has been previously assessed theoretically as a possible candidate ‘primary method’ for amount of substance measurement. It was shown that the measurement methodology can be described completely by a set of measurement equations when a novel quantification process is employed to measure the steady-state diffusion-limited deposition current over an optimum sampling time, instead of employing an analyte stripping step. The corollary is that, for solutions of known composition, the method may be used for highly accurate determination of diffusion coefficients. This investigation uses experimental data from steady-state diffusion-limited current measurements with sampling periods optimised using Allan deviation techniques, together with a full uncertainty analysis to estimate feasibility and likely accuracy of this method. 相似文献