一种单板含水率及其分布特征的在线检测方法

提出了用单板干燥后的终平均含水率、含水率分布和含水率变化趋势等参量来表征单板干燥质量状态的观点;描述了一种可对这些参量进行在线检测的方法;并介绍了运用该检测方法所研制的单板含水率在线检测系统。     

基于虚拟设计技术的秸秆粉碎还田机的开发研制

设计研究一种秸秆粉碎还田机,在理论分析的基础上,通过虚拟设计的方法利用UG设计分析软件对该机进行整体结构的参数化设计。在此基础上,利用UG运动及动力分析模块对刀具的强度及刀辊的动平衡进行校核与测试,并对该机刀辊进行模态分析,确定其临界角速度的大小。通过样机的田间试验可知,该机能较好地满足田间作业的技术要求,进而为秸秆粉碎还田机的设计及研究提供参考。     

巡线机器人机构的运动学反解与仿真

分析巡线机器人机构的位置和姿态结构特点,建立该机构的各连杆坐标系,并在此基础上建立运动学方程.根据末端执行器位置矢量和姿态转换矩阵,采用反变换法求解该机器人机构的运动学反解,并运用计算机仿真的方法进一步验证了该反解的准确性.     

犁体曲面的计算机辅助几何设计

本文应用计算机辅助几何设计原理设计犁体曲面。该研究可作为犁体曲面从经验设计到理论设计以及ＣＡＤ／ＣＡＭ研究的基础     

蒙特卡罗方法与计算机模拟研究

蒙特卡罗方法是一类通过随机变量统计试验,随机模拟以求得问题近似解的方法。计算机模拟研究是蒙特卡罗方法的现代化,利用计算机模拟方法研究植物遗传育种的理论与实践问题不仅是可行的,而且是可靠的。利用计算机模拟研究植物遗传育种问题时需注意建立一个准确可靠的遗传模型,利用能产生周期长且统计性质优的伪随机数产生方法,以使模拟结果更加准确可靠。     

计算机视觉鸭蛋重量检测方法研究

为了实现鸭蛋重量的智能检测,提出基于计算机视觉鸭蛋重量检测方法。首先构造鸭蛋图像的灰度—梯度共生矩阵,根据最大熵原理求出最佳灰度和梯度分割阈值,实现二维阈值分割;其次采用数学形态学方法进行分割图像后处理,去除蛋壳表面存在的伪目标,统计鸭蛋区域像素点;最后利用多项式拟合方法建立面积与鸭蛋重量关系。试验表明,检测误差在±2g以内,平均误差为-0.13353 g,检测精度能够满足生产加工需求。     

基于计算机视觉的竹块颜色分类方法研究

为了实现计算机视觉对竹块的自动识别与颜色分类,研究了竹块图像的颜色特征、颜色分类方法。首先,将原始图像由RGB空间转换为HSI空间,用OTSU法确定阈值对原图灰度图像分割背景,用radon变换倾斜校正,提取竹块颜色判定有效区域,并计算其HSI的均值和标准偏差,作为特征参数输入BP网络进行训练。结果表明,该方法简捷有效,人工神经网络与人工分级的平均一致度为94.5%。     

Application of computational fluid dynamics for modeling and designing photobioreactors for microalgae production: A review

The past decade has seen a rapid increase of numerical simulation studies on photobioreactors (PBRs). Developments in computational fluid dynamics (CFD) and the availability of more powerful computers have paved the way for the modeling and designing PRBs, a strategy that was abandoned from the late 1970s until the 1980s because of its complexity. This paper reviews the present status of numerical modeling for PBRs as well the application of CFD in the design of PBR for the mass production of microalgae. Emphasis is on the major breakthroughs in PBR design that may lead to scaling-up. Most simulations have been conducted in bubble column PBRs, which offer many advantages. Their geometry is simple in design with no moving parts, and they are easy to construct and operate. A majority of published simulation studies used two-phase models (air and water) and employed the Eulerian-Eulerian mixture model. CFD models have been vigorously validated by experimental and laboratory studies, with most claiming to have achieved good results. However, current PBR scale-up projects still need to resolve hydrodynamic issues within the PBR, in order to optimize factors for microalgal growth. To create ideal conditions inside the PBR, the main factors that influence microalgal growth such as light intensity and distribution, gas injection and mixing, and hydrodynamics/flow pattern which are the key for design and scale up must be thoroughly understood.The present practice of PBR design using CFD can be considered both an art and a science because of some numerical simulation issues which are yet to be resolved and the complexity of fluid mechanics inside the PBRs. Nonetheless, CFD has proven to be an effective tool in predicting the complex inherent phenomena in the PBRs. The CFD technique has shown to be very promising to successfully design and develop PBRs which can be commercially available for scale-up.     

中国计算机审计发展问题及对策研究

随着会计电算化的推广和普及,计算机审计应运而生。本文从计算机审计的概念入手,深入剖析了我国计算机审计存在的主要问题,如法律法规不完善、审计人才资源贫乏、审计软件短缺等,并在此基础上提出了具体的解决办法。     

跨网段的微机房管理系统研究

如何进行跨网的微机房管理,一直是各大高校机房管理人员致力于解决的问题。本文介绍了一个跨网段的多功能的大型微机房无卡、无门禁设备管理系统的实现,这种以Windows NT为系统平台的架构可以为机房管理人员提供借鉴。