一种基于小波与双三次插值的CCD图像超分辨方法*

为了尽可能地保持CCD图像的原始信息,提高图像的空间分辨率,有利于对图像的细节信息进行观察分析,对各种超分辨方法进行研究,提出了一种改进的基于小波和双三次插值的超分辨方法：对低分辨率图像进行灰度变换,并把它作为小波逆变换的低分辨率图像,对图像进行恢复,再与低分辨图像的双三次插值图像求平均。将该方法应用于CCD图像,从视觉上空间分辨率有提高,并可以获得25.524 4 dB的峰值信噪比。实验结果表明,该算法得到了比全小波双三次插值、原图像作为低频图像小波双三次插值和双线性插值更高的峰值信噪比及更好的图像细节     

基于MFC的高校人事档案管理信息系统的设计与实现

随着高校信息化、数字化、网络化的不断发展,结合高校人员数量不断增加、分工不断细化、彼此间联系不断紧密的现状,提出了基于MFC的人事档案管理信息系统的设计方案和实现方法。     

Study of buffer and epitaxy technology in two-step growth of aluminium nitride

AlN (aluminium nitride) films were prepared by metalorganic chemical vapor deposition (MOCVD) on c-plane sapphire (α-Al₂O₃) substrates. By means of studying the traces of in-situ optical reflectivity, it was found that the AlN nucleation layer showed a specific (0001) lattice orientation, which differed from the GaN nucleation layer on (0001) sapphire substrates. The AlN buffer suffered the compressive stress at the initial stage of nucleation. And the compressive strain was relaxed gradually along with the thickness of buffer increasing and consequently annealing. Optical transmission spectra revealed that in the process of growing AlN epilayers, higher V/III ratio could improve the crystal quality but reduce the growth rates. In addition, proper doping of silane (SiH₄) could improve the surface morphology of AlN film.     

基于DSP机械密封监控系统

机械密封是机械设备防止泄漏、节约能源、控制环境污染的重要功能基础件,普通机械密封自适应能力差、寿命较短,发展可控机械密封是保证设备长周期安全运转的迫切要求。在分析了国内外在机械密封监控系统研究现状的基础上,设计了机械密封监控系统,该系统在硬件上采用DSP,在软件上采用先进的智能控制算法。它可以以一种预程序化受控方式对密封的工作条件和环境的变化作出快速的反应,使机械密封在满足泄漏量、温度、磨损率等反馈参数的要求下,处于最佳的工作状态,从而提高机械密封的可靠性并延长其寿命。     

部分转化加氢裂化生产清洁柴油

由于人们环境保护意识的提高，世界各国对机动车燃料的标准越来越高，生产高十六烷值，低硫含量的高质量清洁柴油迫在眉睫。对催化原料进行部分转化加氢裂化处理，可以降低柴油产品的硫含量，提高十六烷值，满足目前对产品质量不断提高的要求。增加产品的收率，提高炼厂的经济效益。介绍了几种新的部分转化加氢裂化工艺以及其工业性能和其为炼厂所带来的益处。     

Microstrip stepped‐impedance ring all‐pass filter and wideband 90° phase shifter

A new all‐pass filter (APF) is proposed. The APF is based on a symmetrical ring, consisting of four sections of transmission line, which are identical in electrical length, different in characteristic impedance. Two input/output ports are connected orthogonally to the ring. The APF is analyzed by using the odd‐even model, and the all‐pass condition is then theoretically obtained. Meeting the condition, the circuit is all‐pass in frequency, but nonlinear in transmission phase. The nonlinear transmission phase with frequency may be adjusted by changing the lines' impedances, while remaining the all‐pass property. Then the APF is used to design a wideband 90° differential phase shifter with adjustable bandwidth. Samples are designed, fabricated and measured. Good agreements are achieved among the theoretic, numerical and experimental results. © 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:191–195, 2014.     

基于纳米金非标记化学发光分析测定K^＋

将核酸识体分子识别模式与纳米金催化发光特性相结合,建立了一种简单、灵敏测定K^＋的新方法。该方法测定K＋的线性范围为7．4×10^-8～7．4×10^-5mol／L,其检出限为2．9×10^8mol／L。并对浓度为5．6×10^-7mol／L的K^＋重复测定6次,相对标准偏差为3．6％。同时,考察了K’的适配体对K^＋结合的特异性,结果表明,该：方法对于K^＋的测定具有很好的选择性。     

常见三维场景中水面特效的模拟

针对常见三维场景中水面特效真实感与实时性较难平衡的现状,提出了一种基于Gerstner波模型的水面特效模拟方法。对振幅添加了随机扰动,使得波动更具有变化;在将叠加后Gerstner波分为大波与小波的基础上,通过改变不同类型波的参数可方便地控制波形;最后引入反射率与透明度以适应不同的环境与水体。实验结果表明,新的模型不仅呈现出更加真实的水面特效,而且得到了比较理想的渲染速度。     

HPLC法测定太和春胶囊中淫羊藿苷的含量

建立了HPLC法测定太和春胶囊中淫羊藿苷含量的方法。采用KromasilC1 8(1 50mm× 4 .6mm ,5μm)色谱柱 ,以乙腈 水 (30∶70 )为流动相 ,流速 1 .0ml/min ,检测波长 2 70nm。结果表明 ,该法线性范围为3 .656mg/L～1 8.2 80mg/L,且相关系数良好 (r=0 .9999) ,平均回收率为 99.3 % ,RSD =1 .6 % (n =6)。本法快速、准确、简便 ,适用于太和春胶囊中淫羊藿苷的含量测定。     

Effects of molecular weights of bioabsorbable poly(p‐dioxanone) on its crystallization behaviors

The crystallization behaviors of poly(p‐dioxanone) (PPDO) with different molecular weights (MWs) have been studied using a differential scanning calorimetry. The results showed that the MW of PPDO affects the crystallization rate and crystallinity obviously during the dynamic crystallization process. The Avrami equation has been used to analyze the overall isothermal crystallization of PPDO. Avrami exponents ranging from 2 to 3 were obtained with good fits (correlation coefficients were greater than 0.999 in all the cases) at T_c ranged from 55 to 75°C. Although no significant influence of MW on Avrami exponent has been found, the MW of PPDO plays dominant role on the rate constant k. The values of k increase with the MW in a T_c range from 55 to 75°C. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 2331–2335, 2006