Probabilistic characteristics of the envelope derivative for the sum of signal and narrow-band noise

Probability density and the formula for moments of the envelope derivative of the sum of harmonic signal and Gaussian narrow-band noise have been obtained. A new random function equal to the product of the envelope and phase derivative was introduced and the same probabilistic characteristics were determined for this function. Geometrical interpretation of the sum of signal and noise implies that the introduced function represents angular speed of rotation of the resultant vector.     

Determinization of ordinal automata

It is proved that for each nondeterministic ordinal automaton there exists a deterministic ordinal automaton which is equivalent to the original one for all countable ordinals. An upper bound for the number of states of the deterministic automaton is double exponential in the number of states of the nondeterministic automaton.     

Research on the Structure and the Corrosion Resistance of Zn-Co Alloy Coating

In this paper, by using XRD and XPS the composition and the structure of Zn-Co alloy coating containing Co 0.6%–0.8% and its corrosive products have been investigated analytically; a comparison of corrosion resistance between the alloy coating and conventional zinc coating has been performed; and finally the mechanism of its high corrosion resistance has been presented and discussed.     

高层建筑顶端型钢外悬挑遮阳板施工中采用的操作脚手架

根据紫金城商务楼的特点,为满足遮阳板构及装修施工,采用型钢外悬挑式操作脚手架,使工程圆满完成.     

微波综合测试系统中测试报告的自动生成

微波综合测试系统中，测试数据和得到的测试结果需要按照预定的格式输出，产生测试报告。本文通过编程实现了测试报告的自动生成，既避免由了人员录入数据产生的误差，又提高了测试数据分析的实时性，为进一步进行处理检验提供了便利。     

Si_3N_4对PTC瓷料性能的影响

研究了 Si_3N_4掺杂 BaTiO_3基 PTC 瓷料的显微结构和性能。掺 Si_3N_4的瓷料中出现了大量特征的棒状晶体。Si 富集在棒状晶体中。与掺 SiO_2的瓷料比较,Si_3N_4掺杂的 PTC 瓷料显示了更多的优越性。     

Optical add-drop multiplexers with low crosstalk

We propose and demonstrate three new optical add-drop multiplexer (OADM) architectures with simple and compact configuration and excellent crosstalk performance. The OADMs use a single multiport optical circulator and either one or two narrow-band fiber Bragg gratings, depending on the crosstalk requirement     

三面内抽芯盒盖注射模设计

介绍三面内抽芯盒盖注射模的模具结构及工艺原理，并指出了该模具的设计要点。     

Axonal damage revealed by accumulation of beta-APP in HIV-positive individuals without AIDS

The presence of neuropsychological disturbances in HIV-positive, pre-symptomatic individuals is a controversial issue. Neuroimaging studies have not shown brain atrophy or hyperintensity in the white matter, whereas proton magnetic resonance spectroscopy has revealed some abnormality of cerebral biochemistry. Using an antibody to beta-amyloid precursor protein (beta-APP), we previously demonstrated frequent and widespread axonal changes in the brains of AIDS patients. In this study, we extended the use of beta-APP to asymptomatic patients in order to establish a possible morphological correlation with neuropsychological disorders. Brain samples from 29 patients were examined. Results showed bundles of beta-APP-positive axons in 8/29 cases (27%). The changes, seen in both superficial and deep white matter, were either focal or diffuse, could not be visualized by silver or ubiquitin stains, and did not coexist with any change in distribution or morphology of astrocytes and microglial cells. We conclude that in HIV-positive asymptomatic individuals, axonal changes: (a) may be related to the state of immune activation with consequent presence of toxic substances, including cytokines, observed in these patients; (b) may represent mild changes that could undergo repair, unless other pathological events, such as the supervening of the AIDS stage and the specific encephalitis, make them permanent.     

表面活性剂在拜耳赤泥过滤中的应用

主要针对赤泥过滤时，添加适宜的表面活性剂，使拜耳赤泥料浆中的液体表面张力下降，从而达到降低过滤后拜耳赤泥浆含水率的目的。文中详细阐述了根据拜耳赤泥的特性，筛选拜耳赤泥过滤适应的表面活性剂，并深入地分析了三种类型的表面活性剂在拜耳赤泥过滤的作用和影响，提出了在拜耳赤泥过滤方面采用阴离子表面活性剂的研究方向。