The DDA-Ⅱ Process for Manufacture of Diesel Fuel Meeting the Euro-Ⅳ or even Higher Emission Standard     

Huang Haitao  Men Zhuowu  Hu Zhihai 《中国炼油与石油化工》2006,(1)

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Implementation of RNS-Based Distributed Arithmetic Discrete Wavelet Transform Architectures Using Field-Programmable Logic     

Javier Ramírez  Antonio García  Uwe Meyer-Bäse  Fred Taylor  Antonio Lloris 《The Journal of VLSI Signal Processing》2003,33(1-2):171-190

Currently there are design barriers inhibiting the implementation of high-precision digital signal processing (DSP) objects with field programmable logic (FPL) devices. This paper explores overcoming these barriers by fusing together the popular distributed arithmetic (DA) method with the residue number system (RNS) for use in FPL-centric designs. The new design paradigm is studied in the context of a high-performance filter bank and a discrete wavelet transform (DWT). The proposed design paradigm is facilitated by a new RNS accumulator structure based on a carry save adder (CSA). The reported methodology also introduces a polyphase filter structure that results in a reduced look-up table (LUT) budget. The 2C-DA and RNS-DA are compared, in the context of a FPL implementation strategy, using a discrete wavelet transform (DWT) filter bank as a common design theme. The results show that the RNS-DA, compared to a traditional 2C-DA design, enjoys a performance advantage that increases with precision (wordlength).  相似文献   

Ionic mass transfer measurements in the case of submerged multijets impinging on to a flat surface     

P. Gopala Krishna  P. Venkateswarlu 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1993,56(3):253-258

In the case of submerged multijets impinging on to a flat surface, the limiting current densities were measured at microelectrodes, fixed flush with the target surface using diffusion controlled electrode reactions (i.e. reduction of ferricyanide ion). The height of the multijet distributor from the target surface (Y) was varied from 5 to 9 cm. The numbers of holes of the distributor (N) studied were 76 and 141. The variation of mass transfer data with radial distance reveals the existence of two different regions, i.e. the impingement region and the wall jet region. The mass transfer rate increased with increase in Y in the impingement region. The effect of Y is negligible in the wall jet region. Decrease in N decreases the mass transfer rate in both the regions. The data are correlated separately for the two regions.  相似文献   

石英砂的相变与换向器套筒铸件的变形     

彭发云 《铸造技术》2004,25(10):785-787

用呋喃树脂石英砂工艺生产牵引电机换向器套筒出现变形、裂纹等铸造缺陷,是由石英砂相变膨胀引起,后用高铬刚玉砂代替石英砂得到解决.  相似文献   

Influence of the composition of the binder and the carbonation on the zeta potential values of hardened cementitious materials   总被引：1，自引：0，他引：1  

M. Castellote  I. Llorente  C. Andrade 《Cement and Concrete Research》2006,36(10):1915-1921

Electroosmotic experiments have been carried out on eight different mixes of hardened cementitious matrixes including concrete, mortar and pastes, different types of binders, carbonated and non-carbonated specimens and different test conditions. From these trials, the zeta potential values have been determined and the optimum experimental parameters and devices have been established. In addition, the influence of the composition of the binder on the zeta potential has been quantified indicating that higher amounts of Al₂O₃ in the binder lead to higher positive values of zeta potential, while the SiO₂ acts just on the opposite side. This has been explained in terms of the different i.e.p. (isoelectric point) for both oxides. Concerning the influence of carbonation, it increases the absolute value of the zeta potential toward more negative values; this behaviour has been attributed to the influence of the specifically adsorbed Ca²⁺ in the negative sites of the surface in the non-carbonated samples.  相似文献   

基于现场总线的油品添加剂生产监控系统的设计     

王蒙蒙 《工业控制计算机》2014,(10):12-13

油品添加剂在工业中的应用越来越广泛,加入油品中能显著改善油品原有性能或赋予油品某些新的品质。介绍了油品添加剂的生产控制要求,通过对三合仪表自主研发的SHCAN2000系统以及FIX组态软件资料的查阅,设计一套基于现场总线的油品添加剂生产监控系统。  相似文献   

《动态网站开发》课程教学改革探索     

梁威 《电脑编程技巧与维护》2014,(14):128-129

《动态网站开发》课程是中职学校计算机专业的核心课程,传统的授课方式以讲授理论为主,实际操作较少,这种方式很难适应现在中职学校的教学,必须打破传统的教学理念,对《动态网站开发》课程进行改革。  相似文献   

论“潇湘八景”画题与《坐铺八景》     

程茜 《数码设计:surface》2014,(9):144-146

文章首先概述潇湘八景在日本传播发展的大致特点,之后重点针对铃木春信的《坐铺八景》这一组作品如何对应潇湘八景的每一个画题逐一做详细探讨,并深入阐释了春信作品如何将江户时代一个普遍的创作手法——“见立”创造性的运用于八景画题的独特特点。  相似文献   

筏板基础在自贡地区高层建筑设计中的应用研究     

赵蕴林 《四川轻化工学院学报》2010,(3):369-372

文章结合工程设计经验对自贡地区的高层建筑在选用天然筏板基础的设计过程中,对高层建筑基础设计中涉及到的重要的地基沉降计算、结构设计和地下水等有关问题的处理进行了具体分析,对在一般高层建筑中采用天然筏板基础的实用性和可行性从设计和施工两个方面进行了相关的工程探讨。  相似文献   

框架的行置换和列置换——处理复杂系统的新思维系列之四     

钱洪岗  罗纯  张应山 《上海轻工业高等专科学校学报》2010,(4):288-291

本系列论文基于《多边矩阵理论》,由东方整体性思维所启迪,试图提供并完善一套从整体到局部处理复杂系统多指标问题、非均匀性问题、非线性问题的强有力的数学工具,并对其进行严格的理论推导和证明。本文利用群论的相关概念和结论,将其和框架的剖分运算相结合,引入了导出框架和对称框架的定义,证明了框架的行置换等价于列置换的结论,从而以后可以统一地处理指标间的置换问题。  相似文献