红外光学系统无热化设计的途径

介绍了目前国内常用的主动式无热化技术和国外已成功采用的被动式无热化技术的原理。根据国内的加工工艺水平,分别从3个角度:球面系统光学材料匹配;引入非球面;使用简单的机械辅助结构讨论了从国外引进被动式无热化技术的可能性。经实例设计和大量数据分析得出结论。另外还介绍了目前国内适用于热成像的红外光学材料。     

一种新型谐波传动的CAD研究

本文介绍了以广义蜗牛曲线为凸轮型线的新型谐波传动的CAD问题相关的数学模型和计算方法,并用实例验证了这种模型和方法的可靠性。     

全自动丝印机中的凸轮设计及应用

全自动丝印机是片式元件生产中的关键设备。该设备具有两个工位,它适应于电阻、电容、厚膜电路的印刷。两个工位能够连续自动执行全部印刷过程,并且可以实现左、右两个工位同时印刷两种不同的片式元件和浆料。印刷速度可达1380片/h,生产率高,可靠性好。其中对于保证基片定位精度达到0.015mm和重复定位精度达到0.01mm,从而保证整机有较高的丝印精度,凸轮机构的作用至关重要。主要阐述全自动丝印机中送料和定位装置的凸轮设计及应用。     

融合通信网络摄像机(SIP & WEB Cam)系统设计

设计了一种新的网络摄像机软硬件方案,在网络摄像机内融合WEB与SIP技术,采用SOA构架,设计具有融合通信特点的网络摄像机系统,以面向服务架构(SOA)与SIP呼叫控制的融合,实现网络摄像机的多业务应用,特别是软电话模式的业务应用,适应了视频监控主被动服务提供的业务需求,能直接融入快速发展中的融合核心网IMS,可以实现具有业务、控制、承载完全分离的水平架构的监控安保等业务应用系统.     

LIPSCHITZ ESTIMATES FOR MULTILINEAR SINGULAR INTEGRALS,II

In this paper, the authors study two classes of multilinear singular integrals and obtain their boundedness from Lebesgue spaces to Lipschitz spaces and from Herz type spaces to central Campanato spaces. Moreover, the authors also consider the extreme cases.     

仿制盘形凸轮的数控加工

根据概率论回归分析理论提出了一种根据凸轮实际轮廓实测坐标值，采用最小二乘法进行多项式曲线回归，来拟合凸轮实际轮廓曲线回归方程的新方法，以便仿制凸轮时，在数控机床上加工凸轮轮廓，从而提高了凸轮仿制加工精度和生产效率。     

Idling magnetic white dwarf in the synchronizing polar BY Cam. The Noah-2 project

A multi-color study of the variability of the magnetic cataclysmic variable BY Cam is presented. The observations were obtained at the Korean 1.8 m and Ukrainian 2.6 m, 1.2 m and 38 cm telescopes in 2003–2005, 56 observational runs cover 189 hours. The variations of the mean brightness in different colors are correlated with a slope dR/dV = 1:29(4), where the number in brackets denotes the error estimates in the last digits. For individual runs, this slope is much smaller ranging from 0.98(3) to 1.24(3), with a mean value of 1.11(1). Near the maximum, the slope becomes smaller for some nights, indicating more “blue” spectral energy distribution, whereas the night-to-night variability has an “infrared” character. For the simultaneous UBVRI photometry, the slopes increase with wavelength from dU/dR = 0:23(1) to dI/dR = 1:18(1). Such wavelength dependence is the opposite of that observed in non-magnetic cataclysmic variables, in agreement with the model of cyclotron emission. The principal component analysis shows two components of variablitity with different spectral energy distributions (with a third at the limit of detection), which possibly correspond to different regions of emission. The highest peak in the scalegram analysis corresponds to the 200 min spin variability, its quarter and to the 30 min and 8 min QPOs. The amplitudes of these components are dependent on wavelength and luminosity state. The light curves were fitted by a statistically optimal trigonometrical polynomial (up to 4th order) to take into account a 4-hump structure. The dependences of these parameters on the phase of the beat period and on mean brightness are discussed. The amplitude of spin variations increases with an increasing wavelength and with decreasing brightness. The linear ephemeris based on 46 mean minima for 2003–2005 is HJD 2453213:010(3) + 0:137123(3)E: The extensive tables of the original observations and of results of analysis are published in an electronic form. The nearby star GSC 4081–1562 was found to be an eclipsing red variable.      

生产密疏型灯丝使用的一次绕线机上的凸轮研制

根据１１Ｖ／１２０ｍＡ灯丝所需要的一次绕线的各参数尺寸，利用现有的一次绕线机，研制出生产密疏型灯丝所用的凸轮。     

Minimax efficient finite-difference stochastic gradient estimators using black-box function evaluations

Standard approaches to stochastic gradient estimation, with only noisy black-box function evaluations, use the finite-difference method or its variants. Though natural, it is open to our knowledge whether their statistical accuracy is the best possible. This paper argues so by showing that central finite-difference is a nearly minimax optimal zeroth-order gradient estimator for a suitable class of objective functions and mean squared risk, among both the class of linear estimators and the much larger class of all (nonlinear) estimators.