Optical bistability based on surface plasmon coupled between two noble metal films involving Kerr materials

We successfully investigate an optical bistability phenomenon in a layered structure consisting of Kretschmann configuration involving the Kerr-type nonlinear and the silver film. Pure theoretical approaches are employed to investigate that the surface plasmon could easily be coupled and both the reflection and transmission curves versus the incident intensity forms optical bistability. The transmission curves are greatly influenced by the thickness of the second silver film. These results may be useful for designing novel surface plasmon-based optical devices and will be essential for future classical and quantum information processes.     

单螺杆发动机在不同进气压力下的实验研究

为了改善原有气动发动机的缺陷,提出了一种新型的气动发动机—单螺杆膨胀机,其具有容积效率高、结构控制简单、噪声低、寿命长等特点。为了测试单螺杆膨胀机的各项性能,建立了单螺杆膨胀机压缩空气动力系统,对膨胀机在不同进气压力下进行了实验研究.实验结果表明:随着进气压力升高膨胀机输出功率及总效率升高,而气耗率下降,即膨胀机在高进气压力下具有较好的动力性能、经济性能和较高的总效率。     

光声光谱技术在层状物质的逐层分析研究中的应用——Ⅰ.光声相位精细谱技术

本文提出光声相位精细谱法(PAPFS)。通过对层状物初始态光声相位扫描和对由此产生的PAPFS曲线的解析,可获取各层与光学热学和空间坐标相关的有价值的信息。本文用该法对彩色相纸作了逐层分析,并将结果与电镜作了比较。与PAPFS相关的层状物光声理论将在本文第Ⅱ部分中涉及。     

A Note on Casoratian Solutions to Two-Dimensional Toda Lattice

In this short paper we generalize the conditions that Casoratian entries satisfy for the two-dlmenslonal Toda lattice. Although we finally conclude that our generalization is trivial in some sense for getting new solutions, our discussion is still helpful for the study of Wronskian technique.     

光信息科学与技术专业的建设

就光信息科学与技术专业建设的专业定位、课程设置、学生毕业后的去向等问题发表了个人的看法。介绍了在这方面的一些做法,提供了有关数据,可供同类专业的建设参考。     

煤粉再燃对600 MW锅炉NOx排放的影响

在国内某台燃用褐煤的600 MW机组锅炉上进行了煤粉再燃技术示范并进行了工业试验.机组在600 MW负荷下运行时,NOx排放可控制在274 mg/m3(烟气中氧量折算到6%,下同)的水平,比改造前下降了65.36%,同时燃烧效率没有降低.进行了常规通风、空气分级和煤粉再燃三个工况下的试验,结果表明,煤粉再燃对NOx的控制效果最好,其次为空气分级.再燃煤粉比例对NOx排放也有明显的影响,在试验条件下,随着再燃燃料比例的增加,NOx排放呈降低趋势.     

吸附制冷中化学吸附的滞后圈研究

文中通过对活性炭-氨以及氯化钙-氨的对比试验,对氯化钙-氨化学吸附的滞后圈进行了研究,结果表明, 化学吸附的滞后现象非常严重,已经超出了气-固吸附的Zigmondy、McBain以及Cohan模型所能解释的范围。对化学吸附的Claperon图进行研究,发现吸附床冷却及加热过程中存在着一段等压冷却以及加热过程,这两个过程与吸附滞后圈相对应。对此现象进行分析,结果表明化学吸附的滞后圈形成原因主要与络合物的稳定常数以及吸附特性相关。     

第九讲光速减慢和光缓存技术

高速光信号的存储是光信息科学的重要分支,全光缓存器是当今高速光信号处理的瓶颈.本文介绍了全光缓存器的研究进展,着重介绍了光速减慢的原理、物理基础, 以及在半导体量子点中利用电磁诱导透明效应发展全光缓存器的思路.     

Effect on Intensity Correlation Time by Input Signal in a Single-Mode Laser with Bias Signal Modulation

The effect on intensity correlation time T by input signal is studied for gain-noise model of a single-mode laser driven by colored pump noise and colored quantum noise with colored cross-correlation with a bias signal modulation in this paper. By using the linear approximation method, we detect that there exists maximum (i.e., resonance) in the curve of the intensity correlation time T upon bias-current i0 when the noise correlation coefficient λ is positive; and there exists minimum (i.e., suppression) in the T-i0 curve when λ is negative. And when λ is zero, T increases monotonously with increasing i0. Furthermore, the curve of T upon the signal frequency Ω is also studied. Our study shows that no matter what the value ofλ is, there exists minimum (i.e., suppression) in the T-Ω curve.     

Effective Two-State Model and NOON States for Double-Well Bose-Einstein Condensates in Strong-Interaction Regime

The model of double-well Bose-Einstein condensates in the strong-interaction regime is shown to reduce adiabatically to an effective two-state model describing the Rabi oscillations between the two atomic Fock states ｜N, 0〉 and [0, N〉, and the NOON states of arbitrary ultracold atoms can therefore be generated periodically from the initial state of either one of the Foek states.