云计算起源探析

探讨了云计算概念的起源和发展过程,展示了云计算从一个拼凑的新单词逐渐成为IT领域最流行的趋势并形成产业链的历程。最早从企业层次提出Cloud Computing的是Dell,但对云计算概念产生较深影响的是IBM-Google并行计算项目和亚马逊EC2产品,随后越来越多的媒体、公司、技术人员开始追逐云计算,甚至将很多IT创新都放入云计算概念中,使得云计算概念和产业得以推动和发展,形成了如今包括IaaS,PaaS,XaaS,以及众多的硬件制造商、基础设施运营商等参与的一个完整产业链。     

星载大气痕量气体差分吸收光谱仪数据的定标处理与存储方式研究

星载大气痕量气体差分吸收光谱仪搭载于太阳同步轨道卫星,用于获取紫外至可见波段的高光谱遥感数据,可定量监测全球痕量气体分布、变化及输运过程。为满足大量实时遥感数据的读写功能,并实现载荷数据的快速有效查找与读取要求,选择HDF5数据格式存储大气痕量气体差分吸收光谱仪获得的遥感数据。为测试数据的有效性,基于载荷在实验室获取的0级测试数据,通过暗背景扣除、增益修正、光谱定标与辐射定标等处理,获得1级遥感数据,并将其成功写入HDF5文件中,从而为载荷入轨后的处理提供数据支持。     

分数阶超混沌系统的动力学分析及同步

对一个新的超混沌系统通过分数阶线性系统稳定性理论分析得出其分数阶形式,并利用matlab仿真得出该系统的混沌吸引子图像.接着对该分数阶系统的同阶数和不同阶数两种形式进行异结构的同步分析,设计自适应同步控制器,实现该系统的异结构同步,数值仿真的结果表明设计控制器很好的实现了驱动系统和响应系统的同步.     

风云三号MERSI数据提取北冰洋海冰信息方法研究

海冰是制约北冰洋航路开发最为重要的因素之一,FY-3卫星上搭载的中分辨率光谱成像仪（MERSI)扫描范围大,一天之内可获得5次以上极地同一地区观测数据,有利于北冰洋海冰状况的动态监测。以格陵兰岛附近海域为研究区域,利用2011年6月13日MERSI多波段数据,经过辐射定标、投影定位等预处理后,以两波段比值和归一化差分积雪指数(NDSI)作为判别指标,采用最大类间方差阈值法对指标图像进行分割,实现海冰、海水和云的区分,准确获取格陵兰岛附近海冰分布信息。该研究可为国产卫星数据在北冰洋航路选择和航运安全保障方面的应用提供技术支持。     

基于ADS-B数据的雷达精度测量方法

分析了采用全球定位系统数据测量雷达精度的适用范围,介绍了广播式自动相关监视系统(ADS-B)的工作原理、数据格式、系统测量精度,并提出了一种基于ADS-B数据测量雷达精度的方法。文中验证了该方法在雷达精度考核中的可行性,试验结果表明,该方法可以满足精度较高的相控阵雷达精度测量和考核,且操作简单,易于评估。     

The thymol method for glucosinolate determination

This paper details experiments aimed at optimising the conditions for the determination of glucosinolates in rapeseed (Brassica napus L) using the colorimetric thymol procedure. Glucose could not be substituted for sinigrin when preparing a standard curve for glucosinolate determination unless a correction factor was employed. The value of this factor was found to depend on the concentration of sulphuric acid. Although the coloured complexes formed between thymol and either glucose or sinigrin were found to be unstable at 100°C, the sinigrin/ glucose colour ratio remained relatively constant for incubation times from 40 to 60 min. It was found necessary to increase the amount of thymol present to a final value of 0.23% to ensure complete reaction of glucosinolates. The revised method can be employed successfully for the analysis of glucosinolates in both seed and meal.     

不同系统的相互连接和数据共享

基于解决国家电网渭南供电局在调度自动化系统升级改造工作过程中,遇到的不同厂家不同系统之间的连接和数据信息共享的问题。经过讨论研究,其采用调度数据网部分设备作为硬件支持,在烟台东方电子和国电南瑞科技两厂家技术人员提供软件支持的条件下,解决了该问题。在渭南供电局电力调度中心,这两个系统已经过验收并投入运行。通过进一年来的使用,完全实现了不同厂家、不同系统的数据共享和交换。对此类问题的解决具有普遍意义。     

Photonic theory of noise

The paper proposes that 1/f noise in materials and devices under non-equilibrium conditions is of electromagnetic origin rather than being related to charge carriers. For samples represented by simple resistors the analysis shows that the noise is due to the discrete nature of photons constituting the impinging electromagnetic flux from the source feeding the resistor. The paper presents detailed analysis of the external and internal electromagnetic fields of the resistor environment, with appropriate interpretation in terms of discrete photons. From quantum theory photons are known to retain their energy under interactions in linear environments. This property implies a departure from macroscopic electromagnetics in that photons cannot be partially transmitted and partially reflected, a phenomenon requiring appropriate modifications of boundary conditions at the resistor surface. These special demands call for inclusion of a supplementary internal resistor mode, serving as a lossless idler which is active only for matching purposes. At the resistor terminals the impinging photons give rise to excitation of RF current and voltage noise with an exact 1/f frequency distribution, which is in agreement with all available experimental measurements. The paper presents detailed formulae for noise spectral densities under general drive conditions from DC and RF sources of arbitrary internal resistance. The presented theoretical noise formulae have the same form as earlier empirical formulae for 1/f noise. With an RF source at frequency f₀ the analysis predicts noise with 1/|f-f₀| frequency distribution, which is compatible with available experimental observations.     

Defeating Mechanisms of Armours for Main Battle Tanks

The fundamental protection principles of the new armours for main battle tanks against kinetic energy projectiles(KE) and chemical energy weapons (CE)——shaped charges are shortly described and their efficiency against both threats discussed. The armour topics can be split into: “perpendicular or zero-degree armours”, such as rolled homogeneous armour (RHA), also with extremely high strength, ceramics, glass, liquid filled columns and explosive filled cells,“inclined armours”, as spaced RHA plates with their corner effects, bulging armour, additive and integrated explosive reactive armours (ERA) and “hard kill active defence possibilities” in different defeating distances.     

Reflectivity Model of Low Grazing Angle Radar Sea Clutter

The commonly used reflectivity models of radar sea clutter are summarized. Among these models, the adjusted Barton model and the adjusted Morchin model are compared. From the analysis result, the γ-p reflectivity model is presented for low grazing angle radar sea clutter by the adjustment of the original Barton reflectivity model. The model takes into account radar frequency, grazing angle, sea condition, and polarization property. The influences of these factors on the proposed model are analyzed. The model absorbs the merits from commonly used reflectivity models for sea clutter. It introduces several researchers‘ opinions, and extends them. And it accounts for the reflectivity at arbitrary radar frequency from VHF to X-band, arbitrary low grazing angle, arbitrary sea condition and different polarization property. One of the main results is the proposed γ-p reflectivity model can reflect the influence of polarization on sea clutter reflectivity to some extent. The proposed γ-p reflectivity model of low-angle radar-sea clutter is validated by comparing the simulated and statistically experimental data.