不对称合成中手性磷配体催化剂的研究进展（I）（待续）

评述了作为配体催化剂的手性三配位及四配位磷化合物的合成及其在某些不对称的合反应中的应用。     

Reconstruction and fitting of second-harmonic signals by wavelength modulation spectroscopy method based on fast Fourier transform

Conventional wavelength modulation spectroscopy(WMS) is vulnerable to the influence of low-frequency noise. Accuracy of the method highly depends on the performance of the costly lock-in amplifier. In this article, we report a new and effective method for reconstructing second-harmonic signals through WMS based on fast Fourier transform(FFT). This method is less disturbed by low-frequency noise because it does not use a low-frequency ramp wave. Formulation and detection procedures were presented...     

电子膨胀阀对电动汽车空调系统的调节特性研究

电子膨胀阀是电动汽车空调系统的主要调控部件,探究其调节特性对于制定系统控制策略具有重要意义.本文搭建了以R134a为制冷剂的电动汽车空调系统实验台,研究了电子膨胀阀调节过程中,空调系统内制冷剂流量和压力的动态变化规律,分析了不同压缩机转速下,阀开度对系统制冷量、空调箱出风温度、压缩机功耗和系统COP等性能参数的影响.结果表明：阀前制冷剂相态是影响电子膨胀阀调节时系统压力变化强弱的重要因素.在阀前制冷剂为过冷液态时,调节阀开度对系统压力影响更大,并且在阀前制冷剂具有较大过冷度(大于10℃)时,下调阀开度会导致短时间的过节流造成系统压力大幅波动;系统中制冷剂循环流量与阀开度呈线性变化趋势,不受阀前制冷剂相态的影响.在实验工况下,100%阀开度对应的制冷剂循环流量为97.2～115.5 kg/h,阀开度每下调10%,系统中制冷剂循环流量下降6%～9%.     

几个三角公式、定理的几何解释

把两个斜边分别为a、b的直角三角形按如图所放．     

The He--McKellar--Wilkens effect for spin-1 particles on non-commutative space

By using star product method, the He-McKellar-Wilkens （HMW） effect for spin-one neutral particle on noncommutative （NC） space is studied. After solving the Kemmer-like equations on NC space, we obtain the topological HMW phase on NC space where the additional terms related to the space-space non-commutativity are given explicitly.     

深亚微米HCI模型参数多目标全域提取方法

研究了一种建立在退化栅电流物理解析模型基础上的深亚微米pMOS器件HCI(hot carrier injection)退化模型.提出了一种基于L-M(Levenberg-Marquardt)算法的多目标响应全域优化提取策略,并对可靠性模型参数进行优化提取.分析了优化过程中由于参数灵敏度过低产生的问题并提出采用递归算法求解不同时刻栅电流注入电荷量的加速计算方法.最后,给出了最优化参数提取的结果,并且将测量值与理论值进行了比较,得到很好的一致性.     

结构参数对气液相变热声发动机性能的影响

本文基于包含流动和传热两个方面的电路类比理论,针对一具有环路结构的气液相变热声发动机系统进行了模拟计算和分析。重点讨论了排出器、动力活塞、反馈管以及负载液柱的直径和长度对于系统谐振频率和换热器驱动温度梯度的影响。结果显示,该气液相变热声发动机的谐振频率较低(小于1 Hz),排出器和动力活塞的直径,以及反馈管的直径和长度对于谐振频率的影响较大;气液相变热声发动机所需驱动温度梯度比通常气体工质热声发动机小一到两个数量级,各主要部件的直径对气液相变热声发动机所需驱动温度梯度的影响比长度对其影响更为显著。     

Raman Spectrum of Epitaxial Graphene on SiC （0001） by Pulsed Electron Irradiation

We report new Raman features of epitaxial graphene （EG） on Si-face 4H-SiC prepared by pulsed electron irradiation （PEI）. With increasing graphene layers, frequencies of G and 2D peaks show blue-shifts and approach those of bulk highly-oriented pyrolytic graphite. It is indicated that the EG is slightly tension strained and tends to be strain-free. Meanwhile, single Lorentzian line shapes are well fitted to the 2D peaks of EG on SiC（O001） and their full widths at half maximum decrease with the increasing graphene layers, which indicates that the multilayer EG on Si-face can also contain turbostratic stacking by our PEI route instead of only AB Bernal stacking by a traditional thermal annealing method. It is worth noting that the stacking style plays an important role on the charge carrier mobility. Therefore our findings will be a candidate for growing quality graphene with high carrier mobility both on the Si- and C-terminated SiC substrate. Mechanisms behind the features are studied and discussed.     

对调频(FM)同步广播标准的理解

１任务背景　　　　　调频广播具有抗干扰能力强，信号保真度高，接收简单经济等特点，已成为群众喜闻乐见的主要广播方式。特别对越来越多的流动接收人口来说，具有电视无法替代的优越性，所以尽管调频广播在我国发展才十多年，但是已经得到了全面的普及。　　　　目前我国的调频广播发射台大多采用大功率单一发射机发射。在城市，由于高楼林立，多径反射越来越严重，致使接收效果不理想，覆盖面积减小；在山区，由于山体阻挡，造成理论上应该覆盖的地区，覆盖不了，盲点增多，从而造成资源的浪费；另外由于存在邻近地区同频干扰问题，各地…