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关键词： 工程图   视图分离   坐标转换   DXF文件  

摘要： 提出了一种基于DXF文件的面向三维重建的多视图的视图分离方法.该方法结合DXF文件的结构,分析视图分离中用到的图元数据结构,通过建立图元链表以及设置遍历标志位,提高了寻找各视图的最小外接矩形的效率,实现了多视图的分离,并在此基础上实现了视图关系确定、投影原点的确立以及坐标系的转换,为后续的三维重建工作提供了有效的数据信息.

关键词： 计算模拟   CAI   多媒体课件   分离工程  

摘要： 为了生动直观地表达分离工程中复杂而且繁琐的计算过程,本文利用FORTRAN、VB、FLASH语言,在开发出的分离工程CAI多媒体课件中,成功增加计算模拟模块,使课件更实用和便利。在分离工程的各类计算模块中,以精馏分离过程为例给出在课件中实现计算模拟的具体思路及方法。计算模拟课件充分展现了计算过程及结果可视的优越性,从而加深学生对分离工程计算的感性认识。

关键词： 工程图理解   视图分离   图像处理   视图轮廓   三维重建  

摘要： 视图分离是工程图三维重建的关键步骤之一。该文提出了一种新的工程图视图分离方法,通过将二维视图中的图元转换为图像,利用图像域中离散像素点的连贯性,快速稳定地在图像域中找到视图轮廓和轮廓的最小包围矩形,达到分离视图的目的,然后在图形域中精确确定视图最小包围矩形。该方法的分离过程与视图中图元组合复杂性无关,并能自动分离任意视图数目的工程图。

关键词： pediatric   end-stage renal disease (ESRD)   hemodialysis   peritoneal dialysis  

摘要： Background: The Centers for Medicare & Medicaid Services End-Stage Renal Disease Clinical Performance Measures (CPM) Project contains one of the largest databases of prevalent pediatric dialysis patients in the United States. Since 2005, the CPM Project has included not only children on long-term hemodialysis (HD) therapy, but also those on long-term peritoneal dialysis (PD) therapy. This study describes demographic and clinical characteristics and compares them between patients on HID and PD therapy. Study Design: Cross-sectional. Setting & Participants: Children aged 0 to younger than 18 years included within the 2005 End-Stage Renal Disease CPM Project. Predictor: Demographic and clinical characteristics, with emphasis on dialysis modality. Outcomes & Measurements: Achievement of values for hemoglobin, dialysis adequacy, and serum albumin as recommended by recent National Kidney Foundation-Kidney Disease Outcomes Quality Initiative Clinical Practice Guidelines and Recommendations. Results: Of 1,453 patients examined, 692 received HID and 761 received PD. There was no significant difference by dialysis modality in the likelihood of having a mean hemoglobin level of 11 g/dL or greater;however, HID patients were significantly more likely to have a mean hemoglobin level less than 10 g/dL (19% versus 14% of PD patients;P = 0.02). Although statistically significant, the absolute difference in mean hemoglobin levels between patients receiving HD versus PD was small (11.4 versus 11.6 g/dL). Eighty-nine percent of patients receiving HD and 87% of patients receiving PD achieved the recommended modality-specific Kt/V (P = 0.4). Children receiving HD were more likely than those receiving PD to have a mean serum albumin level of 4.0/3.7 g/dL or greater (bromcresol green/ bromcresol purple laboratory method): 46% versus 33% (P < 0.001). Limitations: Because of study design, only associations can be described. Conclusions: A significant number of children had hemoglobin, serum

摘要： Despite belief to the contrary, technologically sophisticated medical care can be established in developing countries. The process requires intense effort. Preliminary work must include resolving ethical dilemmas, acquiring adequate funding, establishing supply lines, and cultivating proper political support within the host country. Our organization, WORTH (World Organization of Renal Therapies) has successfully launched and is maintaining a dialysis unit in the sub-Saharan African country of Cameroon. So far our complications rate has been trivial, and our metrics indicate that we are successfully delivering safe, effective treatment that can preserve the lives of people with end-stage renal disease in a part of the world where medical care is laboring under difficult conditions. Work is about to begin in establishing a second dialysis unit in that country. We try here to delineate our experience, and we offer a direct challenge to other nephrologists to be activists in delivering modern, advanced technology medicine to more challenging places than those where it is currently flourishing.

关键词： hispanic   anemia   renal replacement therapy   adequacy   KDOQI target  

摘要： Ethnicity information was collected for all pediatric peritoneal dialysis patients from the End-Stage Renal Disease (ESRD) Clinical Performance Measures (CPM) Project for the period October 2004 through March 2005. Associations between intermediate outcomes and Hispanic ethnicity were determined. Thirty percent (207/696) of patients in the final cohort were Hispanic, 24% (165/696) non-Hispanic black, and 46% (324/696) non-Hispanic white. Hispanics were more likely to be female, older, and have a lower mean height standard deviation score (SDS). There were no significant differences among ethnic/racial groups regarding clearance parameters. More Hispanics had a mean hemoglobin >= 11 g/dl compared with non-Hispanic blacks and non-Hispanic whites (77% vs. 55% and 70%, P < 0.0001). More Hispanics compared with non-Hispanic blacks and non-Hispanic whites had a mean serum albumin 4.0/3.7 g/dl [bromcresol green/bromcresol purple laboratory method (BCG/BCP)] (50% vs. 24% and 27%, respectively, P < 0.0001). In multivariate analyses, Hispanics remained significantly more likely to achieve a mean serum albumin >= 4.0/3.7 g/dl (BCG/BCP) compared with non-Hispanic whites (referent) and were as likely to achieve clearance and hemoglobin targets. Pediatric Hispanic peritoneal dialysis patients experience equivalent or better intermediate outcomes of dialytic care compared with non-Hispanics. Further study is needed to understand associations of Hispanic ethnicity with outcomes such as hospitalization, transplantation, and mortality.

关键词： 离心场   非惯性参照系   受力   运动   沉降  

摘要： 本文在非惯性参照系的研究基础上,对离心场中运动的粒子进行受力和运动分析。并将离心场与重力场中沉降的粒子进行对比,把沉降速度公式移植到离心场中。并用上述理论对常见离心法中的离心粒子进行运动状态的分析。

关键词： 工程监理人员   注册监理工程师   总监理工程师   项目监理机构   建筑市场管理   建设单位   法定代表人   授权范  

摘要： 建设部发布《关于加强工程监理人员从业管理的若干意见》(征求意见稿)为解决目前工程监理人员从业管理不规范、人员不到位等问题,切实加强对工程监理人员的从业管理,建设部5月28日发布《关于加强工程监理人员从业管理的若干意见》(征求意见稿)(以下简称《意见》),并就此向各界广泛征求意见。

关键词： 四川天一科技股份有限公司   变压吸附技术   气体分离技术   西南化工研究设计院   高新技术企业   分离工程   科研院所   技术开发  

摘要： 四川天一科技股份有限公司（天科股份，股票代码600328）是以原化工部重点科研院所——西南化工研究设计院优质资产为主而设立的高新技术企业，于2001年1月在上交所上市。公司下属的变压吸附分离工程研究所是专业从事变压吸附（简称PSA）气体分离技术的研究、工程技术开发、工程设计、工程承包的机构。目前，本公司的变压吸附技术已在石化、化工、冶金、环保、食品、电子、航空等行业得到广泛应用，装置遍及全国20多个省、市、自治区，并销售国外。

关键词： simulation   discrete event simulation application   software project management  

摘要： The design and development of large-scale software projects is a complex endeavor, often facing problems like cost and schedule overruns as well as low quality. Over the last years the management of software development projects has been recognized as the cornerstone point of seeking improvement and solutions. Simulation modeling of the software project process is gaining interest among academics and practitioners, as a method to tackle the complex questions with which relevant enterprises are confronted. It offers support on several issues, such as defining software product development strategies, decision-making regarding process improvement and training, in a time span ranging from a short portion of the life cycle to long term product evolution, with organization-wide implications. The aim of this work is to implement a model simulating a core part of a software project process, enabling the estimation of several project development details such as delivery times and quality metrics. The purpose of the model is to assist project managers in control and monitoring, but also in identifying the best planning alternatives. The model scope covers a portion of the life cycle of an incremental software development venture. (c) 2006 Elsevier B.V. All rights reserved.