环境监测实验教学中存在的问题及对策

环境监测实验作为环境监测教学体系中相当重要的组成部分,它不仅能加深学生对相应课程的理论知识的理解和掌握,同时它对学生分析问题和解决问题的能力、工程实践能力以及创新设计能力的培养都有着重要的作用,但在目前的环境监测实验教学中存在着一些不容忽视的问题。本文通过对目前的环境监测实验教学中存在的问题进行分析,同时结合自身的实验教学实践,对实验教学提出了相应的对策。     

基于机械加工生产中机床爬行现象的研究

摘要：机床爬行现象是机床常见故障之一，也是机械加工中难以分析和解决的问题之一，其危害特别大，我们必须采取有效措施加以防范。多年来，通过对机械加工中机床产生爬行现象时的观察、了解、实验和统计分析与研究，从中摸索出其产生爬行时的一些规律，找到了引起爬行的主要原因和解决办法。这里就其产生的机理、常见类型、产生原因及防止措施加以归纳，对机械加工生产具有一定的参考价值。     

转型时期高校洽安管理的现状与对策

本文就转型时期高校治安管理的现状进行了概述，并对转型时期做好高校治安管理的途径进行了初步探讨。     

民间审计组织执业的不足及对策

指出现行的民间审计组织在执行中存在的不足之处 ,提出六条解决对策 :一是积极探索更好的审计方法 ,二是定期检查 ,对执业过程中的不规范行为予以严惩 ,三是对审计报告使用者进行教育 ,四是签定业务约定书 ,明确审计的性质、范围及双方责任。五是投保充分的责任险。六是完善职能部门 ,建立内部法律部门     

“入世”对我国硬质合金工业影响浅析

分析了我国硬质合金工业的现状 ,指出了加入WTO可能对我国硬质合金工业产生的影响 ,提出了应对措施。     

A comparative analysis of hotspot identification methods

The identification of crash hotspots is the first step of the highway safety management process. Errors in hotspot identification may result in the inefficient use of resources for safety improvements and may reduce the global effectiveness of the safety management process. Despite the importance of using effective hotspot identification (HSID) methods, only a few researchers have compared the performance of various methods. In this research, seven commonly applied HSID methods were compared against four robust and informative quantitative evaluation criteria. The following HSID methods were compared: crash frequency (CF), equivalent property damage only (EPDO) crash frequency, crash rate (CR), proportion method (P), empirical Bayes estimate of total-crash frequency (EB), empirical Bayes estimate of severe-crash frequency (EBs), and potential for improvement (PFI). The HSID methods were compared using the site consistency test, the method consistency test, the total rank differences test, and the total score test. These tests evaluate each HSID method's performance in a variety of areas, such as efficiency in identifying sites that show consistently poor safety performance, reliability in identifying the same hotspots in subsequent time periods, and ranking consistency. To evaluate the HSID methods, five years of crash data from the Italian motorway A16 were used.The quantitative evaluation tests showed that the EB method performs better than the other HSID methods. Test results highlight that the EB method is the most consistent and reliable method for identifying priority investigation locations. The EB expected frequency of total-crashes (EB) performed better than the EB expected frequency of severe-crashes (EBs), although the results differed only slightly when the number of identified hotspots increased. The CF method performed better than other HSID methods with more appealing theoretical arguments. In particular, the CF method performed better than the CR method. This result is quite alarming, since many agencies use the CR method. The PFI and EPDO methods were largely inconsistent. The proportion method performed worst in all of the tests. Overall, these results are consistent with the results of previous studies.The identification of engineering countermeasures that may reduce crashes was successful in all of the hotspots identified with the EB method; this finding shows that the identified hotspots can also be corrected.The advantages associated with the EB method were based on crash data from one Italian motorway, and the relative performances of HSID methods may change when using other crash data. However, the study results are very significant and are consistent with earlier findings. To further clarify the benefits of the EB method, this study should be replicated in other countries. Nevertheless, the study results, combined with previous research results, strongly suggest that the EB method should be the standard in the identification of hotspots.     

浅析水泥混凝土强度的影响因素与施工质量控制

重点从原材料品质诸如砂石料含泥量、减水剂、水泥、碎石级配以及施工工艺等方面简要阐述水泥混凝土强度的主要影响因素,并提出相应的施工质量控制措施,为水泥混凝土结构的设计和施工提供借鉴.     

F油田长6超低渗油藏主要开发问题及技术对策

F油田长6油藏是鄂尔多斯盆地内较早开发并具规模的超低渗油藏。为了提高开发效果,解决开发中的问题和矛盾,通过矿场开发实践,较为系统地总结了长6油藏开发中所应用的8项技术,并对各项技术的应用效果进行了评价。通过这些技术的矿场应用,油藏的开发达到了较为理想的开发效果。     

徐汇滨江复杂空间结构方案设计综述

简要介绍了徐汇滨江＂天地＂方案的设计理念和结构体系,针对结构设计中的难点,具体阐述了相应的处理对策,并通过采用SAP2000结构软件建立有限元模型对其进行了分析,得出该结构方案设计采取的一系列措施是有效的,可行的结论。     

基于亲和图和系统图的建筑施工安全事故分析

通过分析建筑施工安全事故的危害性,说明了其对社会造成的消极影响,运用亲和图法分析了造成建筑施工项目安全事故的成因,并运用系统图法分析了对应的对策措施,以减少建筑施工安全事故的发生。