A cumulant matrix subspace algorithm for blind single FIR channelidentification

Blind identification of discrete-time single-user FIR channels with nonminimum phase is studied here. Exploiting higher order cumulants of output signals of unknown channels, a new closed-form solution to the FIR channel impulse response is derived. The algorithm is simple and fast. It relies only on nullspace decomposition of some cumulant matrices. This method neither involves the difficult task of iterative global minimization of nonunimodal cost functions, nor does it require overparametrization, which poses consistency difficulties. It can be used either as the final channel estimate or as a good initial point in nonlinear cumulant matching techniques. The application of this identification method is broad and not limited to the use of any fixed-order cumulants. Its application in identifying data communication systems shows great potential and promise     

Applications of dense media radiative transfer theory for passivemicrowave remote sensing of foam covered ocean

The effect of the foam covered ocean surface on the passive microwave remote sensing measurements is studied based on the electromagnetic scattering theory. In formulating an electromagnetic scattering model, the authors treat the foam as densely packed sticky air bubbles coated with thin seawater coating. The layer of foam covers the ocean surface that has air bubbles. They then use dense media radiative transfer (DMRT) theory with quasi-crystalline approximation (QCA) for densely distributed sticky moderate size particles to calculate the brightness temperatures of the foam-covered ocean surface. Results are illustrated for 19 GHz and 37 GHz and for both vertical and horizontal polarizations as a function of foam microstructure properties and foam layer thickness. Comparisons are also made with experimental measurements     

并列运行的除氧器压力自动调整的方法

分析除氧器并列运行时,其压力自动调整出现的问题。提出了对于除氧器水位的普遍变化,要通过水位自动调整灌手动改变补水开度的办法来调整;对于除氧器间水位的相对变化及除氧器的压力变化,则要靠改变除氧器进汽门的开度来调整。并根据实际情况,提出相应的处理方法。     

市场竞争条件下组建煤炭企业集团的动因分析

针对我国煤炭产业内部过度竞争和煤炭产业结构不合理的现状,本文应用产业组织理论,博弈论的基本原理,以构建煤炭产业内部有效竞争为目标,首先对组建煤炭企业集团的合理性进行了定性分析,然后从多种角度讨论了组建煤炭企业集团的博弈模型、均衡解和优化问题,从而揭示了组建煤炭企业集团的动因,为煤炭产业结构调整及其完善提供有益的理论依据。     

一种低信噪比条件下点目标检测方法

本文提出了一种低信噪比条件下从图像序列中检测点目标运动轨迹的新方法。基于目标运动轨迹的连续性，构造了一种准连续性滤波器结构，采用正向－反向二次滤波算法，有效地抑制了噪声的影响。在此基础上，依据待检目标运动轨迹的性质定义了一种目标函数，将轨迹检测问题转化成为寻找该目标函数最小值的问题。进而由Ａ算法在加权图中搜索最短路径以获取目标函数的最小值，从而确定点目标的运动轨迹。实验结果表明，该方法克服了以往算     

LSM下乳癌,乳腺囊性增生症早期恶变及乳腺增生细胞荧光特性的观察

本文报道了乳癌、乳腺囊性增生症早期恶变及乳腺增生细胞在单色激光激发下的自体荧光。结果发现乳癌细胞浆内荧光最强，囊性增生早期恶变细胞次之而乳腺增生细胞浆无荧光。这一荧江特征可为肿瘤早期诊断提供重要依据。     

SiGe／Si异质结器件

本文综述了国际上ＳｉＧｅ／Ｓｉ异质结器件的发展状况，分析了该器件的结构要理，特点，优越性及制造技术，阐述了该器件的广阔应用和对微电子将产的重大影响。     

真空电击穿的材料显微组织影响因素

本文总结了合金的显微组织对真空击穿的影响规律。应用材料学科和电子、电气学科的基本理论，在大量实验基础上提出了关于合金耐电压强度的新观点。本文介绍了真空击穿实验过程，并从四个方面说明材料显微组织对耐电压强度的影响：①合金的首击穿相；②老炼的作用；③硬度与耐电压强度的关系；④添加合金元素的影响。