基于复合材料层合板理论的路面动力响应研究

根据层合板理论,将路面视为Winkler粘弹性地基上宽度为B的无限长厚板,研究了交通荷载下混凝土路面的动力响应,也同时考虑运动荷载速度的影响.运用Fourier级数和Fourier变换技术得到了运动荷载作用下路面动力响应积分形式的解答,并利用数值Fourier逆变换得到运动荷载响应的计算结果,分析了荷载速度对位移和弯矩响应的影响.     

New approach for deriving density operator for describing continuum photodetection process

By introducing the two-mode entangled state representation <η| whose one mode is a fictitious one accompanying the system mode, this paper presents a new approach for deriving density operator for describing continuum photodetection process.     

考虑热传递时有温度反馈的缓发超临界过程分析

对输入小阶跃反应性（ρ0〈β）、有热传递和温度反馈时反应堆缓发超临界过程进行了研究。提出了一个新的物理模型,由数值计算求出任意初始功率条件下反应堆反应性、功率随时间的变化规律,并进行分析讨论,给出了一些有益的新结果。The delayed supercritical process of nuclear reactor with temperature feedback and heat transfer while inserting small step reactivity（ρ0〈β）is analyzed. A new model is proposed. For an initial power, the variations of output power and reactivity with time are obtained by numerical method. The results are analyzed and discussed. Some useful new conclusions are drawn.     

Nonlinear optical properties in double-sided nonlinear media with Z-scan technique based on the Huygens——Fresnel principle

We present a theoretical model to analyse the propagation of a Gaussian laser beam through double-sided nonlinear media. This model is based on the Huygens--Fresnel diffraction integral method. This theoretical model is not only consistent with the cascade structure model for a small nonlinear phase-shift but also can be used for a large nonlinear phase-shift. It has been verified that it is suitable to characterize the double-sided nonlinear media compared with the cascade structure model. A good agreement between the experimental data and the results from the theoretical model is obtained. It will be useful for the design of multi-sided nonlinear materials.     

模拟跨膜信号的偶氮苯化合物的合成及表征

在一种仿G蛋白耦合型信号转导的人工超分子系统中引入一类偶氮苯结构的化合物,用来模拟跨膜受体。选用偶氮苯类化合物为受体是因为该化合物具有光致异构化的特性,能够引入光信号。实验合成了苯丙氨酸甲酯偶氮苯、缬氨酸甲酯偶氮苯、谷氨酸甲酯偶氮苯,并用红外光谱、紫外可见光谱以及核磁共振方法进行表征,结果显示,所合成的产物是预期产物。     

New fractional entangling transform and its quantum mechanical correspondence

In this Letter, a new fractional entangling transformation(Fr ET) is proposed, which is generated in the entangled state representation by a unitary operator expfiθeabt abTg where aebT is the Bosonic annihilate operator. The operator is actually an entangled one in quantum optics and differs evidently from the separable operator, expfiθeaa t bbTg, of complex fractional Fourier transformation. The additivity property is proved by employing the entangled state representation and quantum mechanical version of the Fr ET. As an application, the Fr ET of a two-mode number state is derived directly by using the quantum version of the Fr ET, which is related to Hermite polynomials.     

MVR海水淡化系统运行特性分析与优化

根据质量与能量守恒,建立了机械蒸汽再压缩(MVR)海水淡化的热力学模型,使用工程方程求解器(EES)软件分析了系统性能与增压比、蒸发温度、进料海水浓度及温度等参数间的量效关系。结果表明增压比与蒸发温度对系统性能的影响相似,增压比越小、蒸发温度越低,系统的比功耗越低,回收率越高;随着进料海水温度的降低、进料海水浓度的降低,系统淡水回收率越高,比功耗下降但不明显;这些可为MVR海水淡化系统的优化设计提供借鉴。     

圆柱体的滚动摩擦系数的测量研究

从圆柱体在斜面上的基本受力分析入手,推导圆柱体沿斜面运动过程中的发生滚动的临界角及滚动摩擦系数的关系式。并通过简单的实验装置测定了铁质圆柱体与玻璃的滚动摩擦系数和静摩擦系数分别约为0.0921和0.121。理论与实验结果基本符合,表明该实验方法对于测定静摩擦系数和滚动摩擦系数的有效性,也为力学基本问题的研究提供了方法。     

添加聚碳硅烷(PCS)对ZrB2-SiC超高温陶瓷微结构和力学性能的影响

采用聚碳硅烷(PCS)和纳米ZrB2粉体为原料在不同温度下热压烧结制备了ZrB2-SiC超高温陶瓷,对比了PCS和颗粒状SiC的引入对ZrB2陶瓷微结构和力学性能的影响.结果表明:通过PCS替代颗粒状SiC制备ZrB2-SiC超高温陶瓷可以形成SiC均匀包覆基体ZrB2晶粒的微观结构,明显促进了材料的低温致密化并抑制了晶粒长大.但力学性能略有降低,其原因可能是PCS裂解产生的微量碳遗留在基体ZrB2的晶界处,弱化了晶界结合强度.本文验证了采用PCS和纳米ZrB2粉体进行热压烧结是实现ZrB2-SiC超高温陶瓷低温致密化的有效手段.     

Low-Frequency Noise in Amorphous Indium Zinc Oxide Thin Film Transistors with Aluminum Oxide Gate Insulator

Low-frequency noise(LFN) in all operation regions of amorphous indium zinc oxide(a-IZO) thin film transistors(TFTs) with an aluminum oxide gate insulator is investigated. Based on the LFN measured results, we extract the distribution of localized states in the band gap and the spatial distribution of border traps in the gate dielectric,and study the dependence of measured noise on the characteristic temperature of localized states for a-IZO TFTs with Al_2 O_3 gate dielectric. Further study on the LFN measured results shows that the gate voltage dependent noise data closely obey the mobility fluctuation model, and the average Hooge's parameter is about 1.18×10~(-3).Considering the relationship between the free carrier number and the field effect mobility, we simulate the LFN using the △N-△μ model, and the total trap density near the IZO/oxide interface is about 1.23×10~(18) cm~(-3)eV~(-1).