PDM与ERP系统集成设计

产品数据管理(PDM)和企业资源计划(ERP)是两个在不同阶段、针对不同领域发展起来的不同的应用系统,是目前企业实施先进制造模式的主要信息技术支撑。概述了PDM与ERP系统的作用与意义,通过分析两个系统的功能异同、任务划分、集成模式及系统集成的关键技术,提出了PDM与ERP系统集成的形式与方案。采用模块化和面向对象的系统设计方法,对PDM/ERP集成系统的总体结构进行了设计,并对各个模块的主要功能做了介绍。     

PDM系统在打瓜捡拾脱籽联合作业机开发中的应用

以打瓜捡拾脱籽联合作业机为例介绍采用PDM系统管理产品相关数据与过程的方法和特点;讨论了产品数据管理(PDM)系统对整个产品生命周期的描述、控制和管理,构建了以产品数据管理系统作为支撑技术的机具虚拟设计集成平台。     

基于SmarTeam的CAPP系统研究与应用

CAPP与PDM的集成是影响企业信息化的关键因素之一。本文提出了一种以SmarTeam为平台的嵌入式CAPP系统,给出了系统的体系结构,分析了CAPP系统的各个功能模块及实现方法,然后研究了CAPP系统和SmarTeam系统的集成技术,最后以VB为开发工具,实现了基于SmarTeam的CAPP系统。     

基于UG的双横臂独立悬架运动学分析系统

提出了一种基于UG构建双横臂独立悬架运动学分析系统的方法,并应用该方法开发出了相应的原型系统,给出了系统的框架结构.系统的快速参数化设计模块可方便、快捷地对双横臂悬架运动仿真模型的结构参数、几何参数和定位参数进行修改;系统的运动学仿真分析模块通过调用UG/Motion集成的MSC ADAMS或Function Bay RecurDyn解算器来获取仿真分析结果,通过集成Matlab的绘图功能对分析结果进行输出查看;以前轮定位参数的变化量最小、车轮侧向滑移量最小为优化目标,采用遗传算法构建了系统的悬架机构结构参数优化设计模块.通过一个设计实例验证了系统的正确性及基于遗传算法的结构参数优化设计模块的有效性.系统的框架结构具有良好的可扩展性,已在麦弗逊悬架的优化设计过程中得到应用.     

基于UG的车辆电磁制动器虚拟装配系统开发

通过对UG建模技术的研究提出了一种面向虚拟装配的装配模型及工艺信息树,在此基础上采用二次开发工具UG/OPEN API开发出车辆电磁制动器虚拟装配系统,讨论了系统的总体工作流程以及模型重构、装配工艺规划、装配仿真和干涉检验等关键技术模块,最后给出了系统的应用实例.     

异构数控系统的网络化集成制造技

为适应网络化制造的功能要求,构建了基于车间异构数控系统的网络化集成通信体系结构.该结构体系融合了设备层信息与车间层控制、管理信息,可实现底层设备与上层应用系统之间的信息交换与融合集成;建立了通信体系的网络通信机制,并论述了应用设备的信息集成,以及与企业内部系统基于公共对象请求代理体系结构的信息集成和与外部系统基于Web服务的信息集成.该方案有助于网络化制造环境下企业内部或企业间的制造信息集成.     

PDM系统中工程矢量图的数据管理技术研究

针对碟簧产品数据管理系统开发过程中有关工程图的管理问题,研究了在PDM系统中采用数据库管理技术对工程矢量图进行管理的方法,包括基于ADO的数据管理技术和基于OLE自动化的软件集成技术等,为企业全面实现产品数据管理提供了技术支持。     

基于产品结构树的CAPP系统开发技术

通过一个实际系统，介绍了基于产品结构树的CAPP系统的设计和开发，并结合CAPP系统独立性与集成性之间的关系，重点阐述了产品结构树的数据结构设计，与PDM的集成接口和日志管理的解决方法。     

基于PDM犁的智能CAD设计系统

讨论基于产品数据管理(PDM)犁的智能CAD设计系统基本框架及其3个组成部分：设计专家系统、产品数据管理和犁的计算机辅助设计。研究了各部分的功能和技术实现，设计专家系统用于犁的参数化设计过程中参数的选择和装配图装配合理性的判断，PDM主要管理犁的辅助设计相关的数据和文件以及专家系统知识。在此基础上，介绍了集成专家系统和产品数据管理犁的计算机辅助设计软件开发。     

基于SolidWorks Enterprise PDM农机企业信息平台建设

我国农机企业的信息化建设水平参差不齐,与国际先进农机制造企业差距较远。本文通过分析我国农机企业对PDM产品数据管理的需求,提出采用SolidWorks Enterprise PDM作为基础平台,集成和整合AutoCAD、SolidWorks、ERP、Office等相关应用系统,构建农机企业的设计与研发协同工作平台,形成以生产管理为重点的一体化信息管理系统,全面建设我国农机企业信息化管理系统,进一步提升我国农机企业信息化建设水平。     

Overland water and salt flows in a set of rice paddies

Cultivation of paddy rice in semiarid areas of the world faces problems related to water scarcity. This paper aims at characterizing water use in a set of paddies located in the central Ebro basin of Spain using experimentation and computer simulation. A commercial field with six interconnected paddies, with a total area of 5.31 ha, was instrumented to measure discharge and water quality at the inflow and at the runoff outlet. The soil was classified as a Typic Calcixerept, and was characterized by a mild salinity (2.5 dS m⁻¹) and an infiltration rate of 5.8 mm day⁻¹. The evolution of flow depth at all paddies was recorded. Data from the 2002 rice-growing season was elaborated using a mass balance approach to estimate the infiltration rate and the evolution of discharge between paddies. Seasonal crop evapotranspiration, estimated with the surface renewal method, was 731 mm (5.1 mm day⁻¹), very similar to that of other summer cereals grown in the area, like corn. The irrigation input was 1874 mm, deep percolation was 830 mm and surface runoff was 372 mm. Irrigation efficiency was estimated as 41%. The quality of surface runoff water was slightly degraded due to evapoconcentration and to the contact with the soil. During the period 2001–2003, the electrical conductivity of surface runoff water was 54% higher than that of irrigation water. However, the runoff water was suitable for irrigation. A mechanistic mass balance model of inter-paddy water flow permitted to conclude that improvements in irrigation efficiency cannot be easily obtained in the experimental conditions. Since deep percolation losses more than double surface runoff losses, a reduction in irrigation discharge would not have much room for efficiency improvement. Simulations also showed that rice irrigation performance was not negatively affected by the fluctuating inflow hydrograph. These hydrographs are typical of turnouts located at the tail end of tertiary irrigation ditches. In fact, these are the sites where rice has been historically cultivated in the study area, since local soils are often saline-sodic and can only grow paddy rice taking advantage of the low salinity of the irrigation water. The low infiltration rate characteristic of these saline-sodic soils (an experimental value of 3.2 mm day⁻¹ was obtained) combined with a reduced irrigation discharge resulted in a simulated irrigation efficiency of 60%. Paddy rice irrigation efficiency can attain reasonable values in the local saline-sodic soils, where the infiltration rate is clearly smaller than the average daily rice evapotranspiration.     

瓦房店市水果生产标准化发展研究

瓦房店市是我国重要的水果生产基地,在国内水果生产领域占有重要地位。随着水果市场化的不断深入,如何满足和适应国内外市场需求成为瓦房店市水果生产的关键问题。从瓦房店市水果生产实际出发,阐述了实施水果生产标准化的必要性,提出了发展水果生产标准化的具体措施。     

金谷子耐旱TG118引种试种及推广应用

对引进的谷子新品种金谷子耐旱TG118进行品种比较试验和多点试种。结果表明：该品种抗旱、耐瘠、适应性强,稳产、高产、抗病抗风抗倒伏强,品质优良,粮草兼用,种植简单,省工易管;一般产量在6000kg/hm2以上,比当地主栽品种增产20%以上。最高产量达9450kg/hm2,适于在辽西北地区推广应用。     

对《种子法》存在问题的探讨

《种子法》是我国种植业第一部法律。自实施以来,为依法加强种子管理提供了有力的法律支撑,促进我国种子产业发生翻天覆地的变化。但随着依法管理工作的深入和种子产业的快速发展,《种子法》及配套规章的一些问题逐步显现出来。对《种子法》及配套规章存在的问题进行深入分析,对需要进一步补充的章节以及需要调整的内容进行深入探讨,以求更加完善和明确。     

Review of the Egyptian experience in implementing land drainage projects

About 30 years have passed since the Government of Egypt embarked on implementing a series of large scale drainage projects. At present, about 3.8 million acres have been provided with drainage systems on the basis of systematic pre-drainage investigations and designs. The target is to provide drains in approximately 6.4 million acres in the Nile Valley and Delta.The implementation of the subsurface drainage system is carried out by the public sector and private contractors under direct supervision of governmental regional departments. The implementation process depends on many factors related to the drainage material, machinery, manpower, site requirements, farmers and organizations involved. Problems and constraints are sometimes challenging, however, the annual rate of implementation has gradually increased to 170,000 acre/year.This paper discusses the different aspects involved in the implementation process of drainage systems. The development in materials, machinery and construction technologies will be reviewed. Institutional and management factors are going to be also considered.     

和谐社会理论建设的几点哲学思考

在新世纪,面对机遇和挑战,党的十六大把“社会更加和谐”作为全面建设更高水平的小康社会的一个重要目标。中国人素有社会和谐的理想;西方人自古也向往社会和谐;借鉴东西方两种和谐社会思想的经验、教训,构建社会主义和谐社会理论。     

A European irrigation map for spatially distributed agricultural modelling

We present a pan-European irrigation map based on regional European statistics, a European land use map and a global irrigation map. The map provides spatial information on the distribution of irrigated areas per crop type which allows determining irrigated areas at the level of spatial modelling units. The map is a requirement for a European scale assessment of the impacts of irrigated agriculture on water resources based on spatially distributed modelling of crop growth and water balance. The irrigation map was compiled in a two step procedure. First, irrigated areas were distributed to potentially irrigated crops at a regional level (European statistical regions NUTS3), combining Farm Structure Survey (FSS) data on irrigated area, crop-specific irrigated area for crops whenever available, and total crop area. Second, crop-specific irrigated area was distributed within each statistical region based on the crop distribution given in our land use map. A global map of irrigated areas with a 5′ resolution was used to further constrain the distribution within each NUTS3 based on the density of irrigated areas. The constrained distribution of irrigated areas as taken from statistics to a high resolution dataset enables us to estimate irrigated areas for various spatial entities, including administrative, natural and artificial units, providing a reasonable input scenario for large-scale distributed modelling applications. The dataset bridges a gap between global datasets and detailed regional data on the distribution of irrigated areas and provides information for various assessments and modelling applications.     

粉质仪和拉伸仪在面粉生产中的应用

在介绍粉质仪和拉伸仪结构和原理的基础上,探讨了粉质曲线中吸水率、形成时间、稳定时间、弱化度和评价值等指标与面粉品质的关系,以及如何根据拉伸曲线中面团最大拉伸阻力、延伸度和拉伸曲线面积等指标来评价面团品质,并结合生产实际,概述了粉质仪和拉伸仪在面粉生产中的作用。     

农村信息化服务的现状及建设措施

分析当前我国农村信息化服务的现状,提出加强农村信息化服务的新举措。     

车辆ABS控制算法的研究及探讨

对现代汽车的ABS控制算法作了一些简单的介绍,同时指出了它们的一些缺陷,相应地提出了几种对ABS的其它控制方法并加以探讨,其中着重论述了ABS门限值控制算法中参考车速的确定方法和基于附着系数的控制算法。