基于自适应滤波的单像素宽形态学边缘检测

为了进一步提高边缘检测算法的抗噪性和定位精度,提出了一种基于自适应滤波的单像素宽形态学边缘检测算法.首先,分别对图像进行中值滤波和加权均值滤波,并通过自适应调整中值滤波结果和加权均值滤波结果所占的权重抑制脉冲噪声和高斯噪声.然后根据不同取向的结构元素可以有效地检测出不同走向的边缘细节这一特性,定义了一种具 有方向估计的形态学梯度,并利用其检测图像的边缘,最后沿梯度方向进行非极大值抑制以获取单像素宽边缘.实验结果表明,本文算法不仅能够准确地检测图像边缘,而且具有较好的抗噪性能,处理速度也较快.     

NON-CUBIC EQUATION OF STATE FOR PHASE EQUILIBRIUM CALCULATIONS

A new non-cubic equation of state is proposed for calculation of the thermodynamic properties ofnonpolar and polar fluids and their mixtures,including,saturated vapor pressure,saturated liquid volume,saturated vapor volume,heats of vaporization and vapor-liquid equilibria.The new equation is derived from thegeneralized van der Waals partition function in which the repulsive terms are expressed with the Carnahan andStarling equation for hard spheres,and the attractive terms are made up of the dispersive energy and theChemical association energy. The rules of dependence of parameters α and σ and on temperature are considered broadly so that the newequation yields good agreement with experimental saturated properties of 20 nonpolar and 27 polar fluids in therange of reduced temperatures of 0.5 to 1.0 The new equation with parameters group-contributed generally givessatisfactory predictions on saturated properties. Correlations of vapor-liquid equilibrium data for alcohol-containing systems by using van d     

合成氨装置甲醇洗净化工艺模拟计算的研究(Ⅰ)

本文介绍了甲醇洗工艺中部分气化冷凝、绝热闪蒸器和塔系模拟计算方法和结果。相平衡和焓模型采用修正的PR状态方程,方程中引入极性因子和采用二元相互作用系数与温度相关的二次加和形式混合规则。工艺采用五塔流程,全流程用相同的二元相互作用参数,热区两个塔用泡露点法,而冷区三个塔采用流量加和法进行模拟计算,得到的结果与某工厂的设计数据和生产实际数据十分吻合。     

C_4、乙腈、水萃取蒸馏的电子计算

关于用乙腈、水的混合溶剂萃取C_4馏份中的丁二烯的计算方法,尚缺乏有系统的,能结合实际的报导。本文简要地叙述试验数据的归纳,汽液平衡数学模型的建立和试算试验塔的结果。     

乙睛、丙烯睛、水的三元共沸蒸馏

兰化公司石油化工厂丙烯腈车间系1965年从西德引进,采用(?)SW流程。丙烯氨氧化应在固定床反应器中进行。反应产物经酸洗中和及水吸收后得到粗丙烯腈,再经过氰醇缩合反应除去醛、酮等含氧杂质并蒸出氰氢酸后,余下的主要组成为丙烯腈、乙腈和水。在萃取蒸馏塔(D-11,图1)中用水萃取乙腈;塔顶得到脱乙腈后的丙烯腈,在塔D-15中进一     

混沌动力系统中的平凡密钥现象及实用解决方案探讨

从混沌动力系统的基本定义和性质出发,给出了Logistic等典型混沌动力系统中周期k周期点的存在将导致周期k“密钥”和“拟平凡密钥”现象存在的广义解释;同时提出了几种克服该现象的实用解决方案。实验结果证明这些方案实时有效,实用性强。     

CORRELATION OF DIFFUSION COEFFICIENTS FOR LIQUIDS AND DENSE FLUIDS WITH TEMPERATURE AND PRESSURE

On the basis of the free volume theory and activation energy concept,a fundamental equation whichtakes into account the effects of temperature and pressure has been developed.By introducing differentexpressions for the free volume and activation energy,several equations for fluid diffusion coefficients were derivedaccordingly.With the van der Waals free volume and intermal energy formula,a three-parameter model for fluiddiffusion coeffficients at moderate pressure was obtained.The grand average absolute deviation percent of 345data points (44 systems)for self-and infinite dilute inter-diffusivities is 2.32,against the results of the model ofCohen and Turnbull,4.13.In particular,by means of the modified Carnahan-Starling free volume equation,afour-parameter model with average abosolute deviation percent 2.64(30 systems,644 data points)for theestimation of dense fluid inter-and self-diffusivities at high pressures and in supercritical conditions was derived.The derived model is superior to the method of L     

基于电路逻辑设计的图像处理

基于电路逻辑设计的算法硬件加速技术使系统能够有效提高实时处理能力、集成度和可靠性.直方图统计和像素邻域提取是图像处理中的两个基本操作,提出了基于电路逻辑设计解决这两个基本问题的方法,给出了硬件结构图和主要时序图,在所承担的工程化项目中进行了实际应用,取得了较好的效果.     

通用树状多带滤波器组的内存可调实现

通过将多带滤波器组转化为单进单出的线性周期时变系统给出了通用树状多带滤波器组的一种内存可调节的实现.该方法与在整帧信号上进行全局分解生成相同的子带系数且正、逆变换均具有与信号长度无关的低内存需求.该方法的另一个特点是正、逆变换的内存需求的大部分可在正、逆变换之间任意分配.     

Viterbi译码器的优化设计

Viterbi译码算法用FPGA实现时，其硬件资源消耗与译码速度始终是相互制约的两个方面，通过合理安排ACS单元和路径度量存储单元可有效缓解这两方面的矛盾。本文以(2，1，6)卷积码为例，基于基4算法提出的动态路径度量存储管理方法能在不影响译码速度的前提下有效降低译码器的硬件复杂度。