改进BP神经网络的再生粗骨料混凝土强度预测*

抗压强度作为评价再生混凝土主要性能指标之一,从四篇文献中搜集了43个抗压强度样本。基于改进的BP神经网络理论,建立了以再生粗骨料取代率、水灰比、龄期为输入,抗压强度为输出的神经网络模型,其结构形式为3-7-9-1。对该网络进行训练和学习,对并测试样本进行检测,结果表明,训练效率不仅大大提高,且而误差较小,并结合回归拟合系数,进一步表明该模型能够有效的的预测再生混凝土抗压强度值,能满足工程需要。     

推进实施广东省创新医疗器械产品应用示范工程的对策建议

通过对参与广东省“十百千万工程”政商学医各界，包括广东省科学技术厅、广东省食品药品监督管理局、深圳迈瑞生物医疗电子股份有限公司、广州三瑞医疗器械有限公司、汕头市超声仪器研究所有限公司、金域检验中心有限公司、中山大学达安健康产业集团、广东省医疗器械产业技术创新战略联盟、南方医科大学、中山大学工学院、中科院深圳先进技术研究院、韶关乐昌市乐城街道社区卫生服务中心、梅州市蕉岭县中医医院、梅州市蕉岭县新铺镇中心卫生院、蕉岭县广福镇中心卫生院、梅州市兴宁市坭陂镇中心卫生院共16家单位进行调研，分析了实施广东省创新医疗器械产品应用示范工程的意义、现状及问题，提出了进一步推动该项工程的对策建议。     

Establishment and optimization of an evaluation index system for brownfield redevelopment projects: An empirical study

Brownfield redevelopment has recently become the focus of attention of governments, communities, environmental advocates, scientists, and researchers around the world. The purpose of this study is to provide a framework for establishing and optimizing an evaluation index for brownfield redevelopment projects (BRPs). This framework involves three steps: the initial design, testing and optimization, and verification. With the help of two standard statistical software packages, the reliability and validity of the initialized index system are established, and then the optimization of the initial index system is carried out by means of Factor Analysis. The effectiveness of the optimization of the index system is verified through Structural Equation Modeling. Furthermore, an illustration example is used to show how to apply the established index system in the real world.     

公租房工程项目合同类型的选择

公租房项目工期紧任务重,工程内容构成复杂,需根据工程实际情况综合考虑各种因素,灵活运用多种合同类型,确保工程顺利实施。合理选择承发包双方都能接受的工程项目合同类型是公租房项目合同管理的关键一环,是保障公租房项目建设快速有序推进,实现较为理想的投资效益的重要手段。     

Project Risk Screening Matrix for River Management and Restoration

The ‘project risk screening matrix’ derives from a broader effort to assist US government agency staff in reviewing proposed stream management and restoration projects more efficiently and effectively. The River Restoration Analysis Tool (RiverRAT) developed through this effort provides a thorough, comprehensive and auditable approach to review and evaluate proposed stream actions and projects ( www.restorationreview.com ). The matrix was initially developed as the first step in applying the RiverRAT, its purpose being to assist reviewers in assessing the risk to natural resources associated with a particular proposal and matching the intensity of their review to the severity of that risk. Hence, the primary application of the matrix to date has been to identify and screen out low risk projects that may be dealt with expeditiously, so freeing the time and technical resources needed to allow deep reviews of higher risk projects. A second form of screening emerged from this primary function because the matrix proved adept at identifying the minimum level of site and project characterization required to support initial risk assessment. On this basis, proposals lacking adequate information can also be screened out, being referred back to the proponent with a request for additional information. More recently, new and novel versions of the matrix, featuring modification and refinement of one or both of the original axes, have emerged to widen and refine its application to linear infrastructure (e.g. pipelines, roads, and electrical transmission lines), in‐stream structures (e.g. large wood placement and culvert removal), and pre‐application, regulatory, decision‐support tools. Published 2014. This article is a U.S. Government work and is in the public domain in the USA.     

石油化工项目建设管理数据平台的探讨

通过建立项目管理数据平台,让石油化工项目建设管理经验得到更好的传承和利用,数据平台可以实现管理经验数据化、建设数据共享化、数据结构模板化、数据编码标准化、收集数据流程化、数据操作平台化、数据计算集成化、数据更新动态化功能目标。结合石油化工项目建设特点,归纳了5类31种管理数据,介绍了每种数据的内容和用途,并对各种数据的字段设计、平台开发技术选择提出了建议,并对数据平台的未来价值进行了展望。     

优化军工科研项目管理的具体策略

我国的军工科研所成立于上世纪，它以军工项目的科研、预研为主，为我国的国防军工提供研发产品。伴随着我国经济实力的增强和科技军事力量的增长，军工科研院所也转变了原有的工业专属性质，走上了军民两用、寓军于民的道路，并在时代的进步中成为了我国先进装备制造业的重要科研力量和科技创新支柱。凸现军事工业“高、精、尖”的特点，以项目管理的优化为具体策略进行军工科研开发工作。     

电力工程项目管理的三要素分析

现今社会经济正在迅速发展中，电力工程领域也得到了较为良好的发展。但在此领域发展中，项目管理问题较为突显。文章主要是对电力工程项目管理的三要素进行了分析研究，以此帮助有效提升电力项目的管理工作效率及质量。     

陶瓷超滤膜用于盐湖卤水提锂合格液的中试研究

为解决纳滤膜用于盐湖卤水镁锂分离中长时间运行后出现通量下降、膜污染和分离效率下降的问题,开展了将陶瓷超滤膜作为纳滤预处理措施用于盐湖卤水提锂合格液的中试研究。中试设在吸附提锂车间,进水为提锂工序中的合格液。结果表明,在冬天低温环境合格液浊度<50 NTU的条件下,以及在合格液浊度上升至50~170 NTU的极端进水水质条件下,陶瓷超滤膜均可在300 L/（m ²·h）的测试通量下稳定运行,过滤时间为30~50 min/周期。产水浊度稳定<0.1 NTU,优于后续纳滤系统进水要求。