基于SOA架构的PDM系统与制造管理系统集成设计与实现

针对大型装备制造企业单件定制、边设计边变更、老系统众多的特点,分析了产品数据管理系统(PDM)与制造管理系统集成的业务场景,提出了一种基于面向服务架构(SOA)的信息集成方法,有效地满足了装备制造企业数据量大、及时性高以及集成系统多的集成要求。针对装备制造企业支撑产品设计管理最主要的PDM系统和下游生产管理系统的集成要求,给出了完整的设计方案和系统实现,并描述了具体应用效果。     

智能供配电监控系统在大规格棒材工程的应用

采用PDM2000智能化供配电监控系统对某钢铁厂大规格棒材工程供配电监控系统进行电气设计,并介绍了该监控系统的构成、功能以及特点。     

基于PDM平台的CAD/CAPP/CAM集成研究

PDM是CAD/CAPP/CAM的集成平台.本文在集成分析的基础上论述了3种集成模式,并对PDM的网络化发展进行了展望.     

浅谈电子图表的有效性和完整性控制

1、背景 武昌造船厂的Windchill生产设计管理平台已于2005年6月份建设完成并投入应用。目前技术中心已经在该系统支持下完成了一艘船的生产设计。在系统应用的过程中，由于生产部门是根据交付到档案室的纸质生产图表进行船舶建造的，可以认为提交到档案室的纸质图纸是正确的。但实际业务执行过程中容易发生的业务漏洞是，设绘员从本机打印图表所用的电子文件与提交到PDM中的电子文件可能不一致，这样管理在PDM中的电子生产图表可能不是最终正确的，导致了纸质生产图表和系统中电子图表的不—致。     

提高产品竞争力的必由之路--实施PDM

综合概述了企业实施PDM的必要性、重要性，以及企业如何来实施PDM，企业实施PDM所带来的效益等。     

基于eM_Plant的FMS演示系统仿真的实现

eM_Plant作为一种面向制造业离散事件系统的建模软件,它为各种生产系统和过程提供了一系列规划、仿真和优化的工具,在汽车,航天等制造业领域有广泛的应用.本文利用eM_Plant仿真软件工具,针对FMS演示系统设计并实现了可视化的系统仿真模型,并对运行结果进行分析,确定了瓶颈位置,给出了改进的建议.     

信息化对制造业的影响综述

信息技术是一种新型技术。信息技术和制造业相互依存、相互促进是一种发展趋势。信息技术对制造业的影响主要有:信息化在制造业的产品开发设计技术方面带来的进步,这主要包括计算机辅助技术;信息化在制造业的生产管理技术方面带来的进步,主要包括企业制造资源计划系统及产品数据管理;信息化在制造业的制造方式上带来的进步,主要包括柔性制造、计算机集成制造等先进制造技术。     

PDM技术在企业中的应用'

介绍了PDM在企业的文档管理、产品结构树管理、版本与变更管理、人员组织模型、数据安全及备份、产品配置管理、过程管理等方面的应用,分析了企业实施PDM的主要原因,阐述了PDM实施的准备工作、实施的关键步骤及相关问题。     

基于PDM系统的CAD应用方案

针对装备设计企业CAD工具建设的需求,结合企业产品设计的特点,及对CAD工具应用现状的了解,以CAD工具和PDM系统紧密集成应用为主要目标,最终协助企业建立起产品设计、管理一体化解决方案。     

PDM与EPR、CAPP系统集成的接口设计

PDM(产品数据管理)、ERP(企业资源计划)与CAPP(计算机辅助工艺设计)是制造企业增强其竞争力的的最主要技术支撑,三个系统之间的集成是目前制造企业迫切需要解决的问题.文章通过研究分析认为,设计合适的接口程序能很好地解决PDM与ERP、CAPP之间的集成问题.     

Transform Schemes Applied on Non-Finish-to-Start Logical Relationships in Project Network Diagrams

Critical path analysis on a project network having non-finish-to-start (FS) logical relationships with lags is generally referred to as precedence diagram method (PDM). A PDM-based scheduling analysis is facilitated by mainstream project scheduling software (such as P3). However, PDM compounds total float determination and interpretation, potentially causing anomalous effects on critical path identification. In the present research, we generalize those particular circumstances that entail applying non-FS logical relationships on construction projects. We then propose generic transform schemes such that non-FS relationships in a PDM network can be detected and transformed—automatically—into equivalent FS. Moreover, we provide analytical proofs for the transform schemes being proposed to justify the logical equivalency between the original PDM network and the transformed activity-on-node (AON) network only having FS logical relationships. A PDM network example demonstrates that confusions would arise in interpreting P3’s critical path analysis results, but not in the case of the transformed AON counterpart. In conclusion, the transform schemes being proposed lead to better understanding of the scheduling results when critical path analysis is performed on a PDM network. This also paves the way for conducting further sophisticated scheduling analysis (such as resource loading or Monte Carlo simulation) on a PDM network.     

BOM的管理和应用

本文从装备设计制造企业的角度,介绍了在装备设计过程中相关数据所用到的信息化管理技术,结合装备设计制造企业本身的特点,介绍了某装备公司PDM系统在设计开发中对数据管理功能的应用,提出了基于BOM管理和应用的设计开发过程的实施方案。     

Refining the tobacco dependence phenotype using the Wisconsin Inventory of Smoking Dependence Motives: II. Evidence from a laboratory self-administration assay.

Prior analyses of the Wisconsin Inventory of Smoking Dependence Motives (Piper et al., 2004) implicated 4 subscales as primary dependence motives (PDM) indexing the core features of tobacco dependence, with the remaining subscales reflecting secondary dependence motives (SDM; Piper et al., 2008). The current study extended this work by examining the correlates of PDM, SDM, their subscales, and other indicators of dependence in an operant self-administration paradigm. Smokers (N = 58) worked for cigarette puffs under differing fixed ratio schedules. Analyses focused on predicting self-administration under conditions of minimal constraint on tobacco access and on withdrawal and craving under conditions of severe constraint. Results support a 2-factor model of dependence, with the PDM factor showing relatively stronger relations with tobacco self-administration and the SDM factor showing relatively stronger relations with withdrawal symptomatology and distress-related craving. The PDM appears to index core features of tobacco dependence, but susceptibility to deprivation-contingent distress and craving may be better indexed by SDM. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Differential affinity cross-linking of phosphorylase kinase conformers by the geometric isomers of phenylenedimaleimide

Phosphorylase b kinase (PbK) from skeletal muscle is a highly regulated oligomer consisting of four copies of four distinct subunits (alphabetagamma)delta4. The gamma subunit is catalytic, and the remaining subunits are regulatory. To characterize effector-induced changes in the quaternary structure of the enzyme, we utilized the ortho-, meta, and para-isomers of phenylenedimaleimide (PDM), which in addition to having different geometries, also vary 2.5-fold in their cross-linking spans. Even at concentrations equivalent to the alphabetagammadelta protomers of PbK, all three isomers caused specific, rapid, and extensive cross-linking of the holoenzyme to form primarily alphabeta dimers, plus smaller amounts of betagammagamma and alphagammagamma trimers. The formation of these three conjugates was nearly totally inhibited by a 10-fold molar excess over PDM of N-(o- and p-tolyl)succinimide, which are chemically inert structural analogs of PDM. This inhibition suggests that PbK has binding sites for PDM and that PDM acts as an affinity cross-linker in binding to these sites prior to forming cross-linked conjugates. The largest effect on cross-linking in progressing from o- to p-PDM was on the alphagammagamma trimer, which is preferentially formed by the p-isomer. Activation of the enzyme by either phosphorylation or the allosteric activators ADP and GDP resulted in large increases in the amount of alphagammagamma formed, small increases in betagammagamma, and little change in alphabeta. When cross-linked in the presence of the reversibly activating nucleoside diphosphates, PbK remained activated after their removal, indicating that cross-linking had locked it in the active conformation. Our results provide direct evidence for perturbations in the interactions of the catalytic gamma subunit with the regulatory alpha and beta subunits upon activation of PbK.     

General corrosion of alloy 22: Experimental determination of model parameters from electrochemical impedance spectroscopy data

Models used to predict general corrosion damage of Alloy 22 high level nuclear waste (HLNW) containers must be deterministic, relying upon the time-invariant natural laws, because of long time scales involved in the predictions compared with the time over which the corrosion of this alloy has been studied. The point defect model (PDM) is one such model and requires high-accuracy experimental data to determine model parameters that will accurately predict corrosion over the long times required for HLNW disposal. Electrochemical impedance spectroscopy (EIS) and steady-state polarization data were collected in deaerated 4 M NaCl, pH 6 solutions at 30 °C and 60 °C. This work, which was carried out under a quality assurance program, emphasized data reproducibility and adherence to the steady-state condition in order to ensure confluence between theory and experiment. Thus, fresh electrolyte was continuously flowed through test cells allowing test specimens to remain undisturbed for up to 6 weeks during data collection. Parameters for the PDM have been estimated by optimizing the PDM on the impedance data, and the ability of the parameter values to account for the steady-state passive current density and barrier oxide layer thickness has been evaluated using phase space analysis. The calculated impedance gives generally good agreement with experimental data showing that the PDM is a valid approach. This article is based on a presentation made in the symposium “Effect of Processing on Materials Properties for Nuclear Waste Disposition,” November 10–11, 2003, at the TMS Fall meeting in Chicago, Illinois, under the joint auspices of the TMS Corrosion and Environmental Effects and Nuclear Materials Committees.     

PDM++: Planning Framework from a Construction Requirements Perspective

Construction requirements represent the key preconditions for construction. These include topological precedence, key resources, space requirements, etc. Consequently, identifying them is necessary for feasible construction planning to be achieved. Despite this, little attention has been given to the impact of construction requirements on a project schedule, possibly because of the lack of a good tool for representing these requirements. This paper distinguishes construction requirements into static and dynamic types, according to changes in the need of the requirement during its life cycle. A modeling framework, PDM++, is then proposed. The framework deals with schedule constraints arising from both static and dynamic construction requirements, provides greater semantic expression to capture schedule constraints unambiguously, and facilitates the representation of interdependent conditional relationships. The concept of meta-intervals is also devised to represent complex requirements involving several activities and schedule constraints, and it facilitates modeling at higher levels of plan abstractions. Finally, an illustrative case study is presented to show the applicability of PDM++ in representing schedule constraints and alternative scheduling from a construction requirements perspective.     

Polymerization of Dimethylaminoethyl Methacrylate Catalyzed by Substituted Indenyl Lanthanide（Ⅱ） Complexes

The polymerization of dimethylaminoethyl methacrylate （DMAEMA） catalyzed by the 1-cyclopentylindenyl lanthanide （Ⅱ） complex （1-C5H9C9H6）2Yb （THF）2 was investigated. The results indicated that the complex （1- C5H9C9H6）2Yb （THF）2 as a single component catalyst showed high activity. The conversion of the polymerization and the molecular weight of the polymer were affected by temperature, time, amount of catalyst and solvent in the polymerization process. The catalytic activity of （1-C5H9C9H6）2Yb （THF）2 enhanced significantly when a small amount of polar solvent THF was added into the polymerization system in which toluene was selected as the solvent. The optimal temperature of polymerization was about 0 ℃. Other modified substituted indenyl lanthanide （Ⅱ） complexes also showed good catalytic activity. The order of catalytic activity of the complexes was as follows： （1-C5H9C9H6）2Sm（THF）≈ （1- C2 H5 C9H6 ）2 Sm（THF）2 〉 （1 -C5 H9 C9 H6 ）2 Yb（THF）2 〉 （1 -PhCH2 C9 H6 ）2 Sm（THF）2. The steric regularity of p oly （dimeth- ylaminoethyl methacrylate） （PDM AEM A） was characterized by 1H NM R spectra. The polymerization provided syndio- tacticity-rich PDM AEM A. The molecular weight and the molecular weight distribution of PDM AEM A were measured by gel permeation chromatography.     

Effect of Chloride on Semiconducting Properties of Passive Films Formed on Supermartensitic Stainless Steel in NaHCO3 Solution

 The effects of chloride ion on the electrochemical behavior and the semiconducting properties of the passive film on supermartensitic stainless steel in 0. 5 mol/L NaHCO3 solution were investigated using potentiodynamic polarization, the potentiostatic current transients and Mott-Schottky analysis. The results indicated that chloride ion narrowed passivation region and improved pitting susceptibility. The steady state current densities were independent of film-formed potentials, which was in good agreement with the assumption of the point defect model (PDM). The capacitance results showed the fact that the passive films had a multilayer character. The defect density decreased with increasing passive film formation potential. The chloride ion induced changes of the acceptor densities and donor densities of the passive films.