考虑旅客携行行为的安检系统服务参数优化研究

为提高公共交通安检系统服务效率,考虑旅客"绕行取行李""等待取行李"的携行行为,分析安检系统服务流程,构建安检系统的Jackson排队网络模型;分析旅客人体安检和行李安检之间的速度差,厘定在携行行为条件下及不同情境中旅客提取行李前的等待时间,并修正安检系统的Jackson排队网络模型;优化安检系统服务参数,实现系统服务...     

钢结构耐火设计的当量时间

通过给出了一个比国外同类公式离散性更小的当量时间计算公式,从而把各种实际情况下的钢结构耐火设计统一到标准升温条件之下。     

NLGM（1，1^s,t）模型的建立与应用

运用灰色系统理论,建立了一种非线性GM（l,l^s,t）灰色新模型,并将其应用于某厂SO2排放量的预测之中。结果表明,NLGM（l,l^s,t）具有良好的模型品质,中长期预测定GM（l,l）更可靠。     

承压设备风险分析中失效后果加权模型研究

在分析失效可能性和失效后果具有不同权重的特点的基础上,提出一种失效后果加权的风险计算模型,该模型的等风险曲线很好地描述风险矩阵中的风险等级分布,并很好地解释风险矩阵分布的非对称性。所建立的模型能连续地将风险等级区域划分开来,以数学模型的形式描述不同风险等级的边界线,解决了传统风险等风险线跨越不同风险级别区域的问题。根据失效后果加权模型的风险计算结果,分析失效后果的权重大于失效可能性的权重的特点。     

油公司安全生产巡检信息管理系统的研究

油公司安全巡检信息管理系统依托GPS和GIS等技术,采用了B／S结构、JAVA／JSP技术构建;能够准确及时显示巡检员的巡检路径;巡检结果可以从网上数据报表和电子地图中及时得到,实现了实时监控。巡检员发现故障或应急事件时,迅速发送信息通知采油队值班干部,在最短时间内进行处理,保障了油井安全正常生产。     

Understanding Urban Vehicular Pollution Problem Vis-a-Vis Ambient Air Quality – Case Study of a Megacity (Delhi, India)

Air pollution has become a growing problem in megacities and large urban areas through out the globe, and transportation is recognized as the major source of air pollution in many cities, especially in developing countries. Contribution of automobiles is reported in the range of 40 to 80% of the total air pollution. The challenge facing megacities is how to reduce the adverse environmental impacts and other negative effects of transportation without giving up the benefits of mobility. The dilemma becomes most pressing under conditions of rapid urban growth, which is likely to increase travel demand significantly.The paper is aimed at understanding the problem of vehicular pollution vis-a-vis ambient air quality for a highly traffic affected megacity, Delhi, wherein, the contribution of transport sector was estimated to be as high as 72%. An effort has been made to review and evaluate the benefits (in terms of improved air quality) of the technological interventions/policies adopted for vehicular pollution control in Delhi. It also highlights the outcome of the efforts and suggests further improvements thereon. The importance of public participation and awareness are also discussed. The paper focuses on deriving the benefits of the implementation of management strategies, supported by scientific and technical data/interpretation, so that the people can realize and participate in the government's endeavor for clean city drive in a more effective manner.     

A framework to estimate the risk-based shutdown interval for a processing plant

Petrochemical plants and refineries consist of hundreds of pieces of complex equipment and machinery that run under rigorous operating conditions and are subjected to deterioration over time due to aging, wear, corrosion, erosion, fatigue and other reasons. These devices operate under extreme operating pressures and temperatures, and any failure may result in huge financial consequences for the operating company. To minimize the risk and to maintain operational reliability and availability, companies adopt various maintenance strategies. Shutdown or turnaround maintenance is one such strategy. In general, shutdown for inspection and maintenance is based on the original equipment manufacturer's (OEM) suggested recommended periods. However, this may not be the most optimum strategy given that operating conditions may vary significantly from company to company.The framework proposed in this work estimates the risk-based shutdown interval for inspection and maintenance. It provides a tool for maintenance planning and decision making by considering the probability of the equipment or system for failure and the likely consequences that may follow. The novel risk-based approach is compared with the conventional fixed interval approach. This former approach, characterized as it is by optimized inspection, maintenance and risk management, leads to extended intervals between shutdowns. The result is the increase in production and the consequent income of millions of dollars.The proposed framework is a cost effective way to minimize the overall financial risk for asset inspection and maintenance while fulfilling safety and availability requirements.     

复杂矿井通风网络解算风网有效性分析

复杂的矿井通风系统不仅对风网解算提出了更高的要求,对构建的通风网络进行风网检查也变得极其重要。首次提出了风网有效性分析的概念,通过分析改进的回路风量法解算的要求,从数据检查、风网检查和收敛性分析三个方面对通风网络图有效性进行了系统深入的分析,实现了相应的风网检查算法。通过进行强连通性分析可以使假拓扑风网更接近真实风网,通过对固定风量检查可以找出拓扑关联重复性设置的固定风量分支;通过对回路进行独立性检查和收敛性分析使得构建的通风网络尽量满足风网解算的要求,避免回路假收敛并提高解算收敛速度。     

基于RBI的苯乙烯/环氧丙烷装置压力管道在线检验研究

对苯乙烯／环氧丙烷装置进行腐蚀回路划分,并将腐蚀回路中的压力管道按照管径、材质及用途等因素划分为不同的组别后进行RBI分析。根据风险评估结果,结合压力管道的使用情况、失效机理及剩余使用寿命等确定下一个检验周期和检验策略。以腐蚀回路中的组别作为检验单元,根据其失效可能性及风险等级确定各检验单元的检验比例和检验方法进行在线检验。结果表明：基于RBI分析结果的压力管道在线抽检方法可以验证风险评估的结果,同时还可以满足使用单位对管道的风险控制要求。     

铸铁烘缸检验策略的制定

文章首先介绍了一起铸铁烘缸爆炸事故的分析结果,对铸铁烘缸的损伤模式进行了识别,依据损伤模式制定了铸铁烘缸定期检验的策略,以宏观检验、壁厚测定、水压试验为主。实践证明该检验策略实现了检验有效性和经济性的统一。