Assessing the impact of COVID-19 and safety parameters on energy project performance with an analytical hierarchy process

COVID-19 has destabilized the global economy, disrupted the lives of billions of people globally, and caused the workforce to suffer. Furthermore, the spread of this disease has caused most nations to impose strict lockdown regulations and shutdown most industries. This study aimed to highlight the key issues of energy project performance alongside construction activities that were halted during the COVID-19 outbreak to follow social distancing, lockdown, and public safety parameters. A questionnaire survey was administered to accomplish the purpose of this study. The responses of 42 energy project professionals and experts were evaluated using the analytical hierarchy process (AHP) for group decision-making. AHP shows that the biggest influences on project performance during COVID-19 pandemic were government measures and personal factors. The findings provide insight to support energy project planning and management during and after the pandemic, including prioritization of labor force health and safety.     

爆破工程费用计算方法探讨

爆破工程具有周期短、自成完整体系、技术管理严格的特点,但在费用管理上需进一步规范与整顿。本文阐述了工程费用的构成、调整及爆破工程费用的计算方法。     

Regional consortia and transaction costs for sanitation services in Brazil

Studies on public cooperation usually focus on its impact on the service costs experienced by service providers. However, engagement in public cooperation in service provision often seeks other outcomes, like service coverage (measured by the population served) rather than simply minimizing service expenditure. Moreover, public cooperation by local governments, as either ‘providers’ or owners, generates transaction costs arising from negotiation, monitoring, agency costs and the enforcement of cooperative agreements. However, to date, little empirical effort has been directed at determining the impact of transaction costs on service provision owners and service outcomes. This paper addresses this gap in the empirical literature by examining the relationship between cooperative agreements between Brazilian municipalities for water and wastewater provision and service coverage in the light of transaction costs. We find that transaction costs are higher for cooperative providers due primarily to low service coverage levels, especially in sewage services that demand high investment in assets with high specificity. However, lower expenditures may occur after initial up-front investment.     

A clustering-based review on project portfolio optimization methods

Project portfolio management and optimization constitutes a critical activity for organizations in different industrial sectors and business. The scientific literature in this subject is extremely vast, which makes it difficult to understand the connections among the existing approaches and perspectives. This paper provides a clustering map of the existing work on the subject, thus identifying the main trends and approaches from different scientific communities. After analyzing each of the identified clusters, the paper provides insights and emerging trends that can be useful both for researchers and practitioners in the area.     

面向多表数据连接投影和连接顺序的优化方法

多表连接运算是大数据处理中常见的运算。类似于数据库运算中常见的连接操作,多表连接运算的顺序会对计算资源和传输资源的消耗产生巨大影响。对多表连接顺序的优化是一个经典的优化问题,同时每次连接中表的投影结果大小也会影响节点间传输的数据体积,因此整体连接的顺序和每次连接的投影关系都会对连接效率产生显著的影响,而在传统的优化策略中,往往不会考虑到中间投影关系的取舍问题,以及基于中间投影关系而对最优连接策略产生的影响。针对这个问题,建立了一种连接关系索引,能够在构建优化连接策略中调整每次连接的投影关系,及时删除冗余列,减少对传输资源的消耗,同时基于投影关系的优化调整连接顺序的优化策略,从全局考量上尽可能地同时减少对传输资源和计算资源的消耗。该优化策略在Flink系统实现后进行了实验,结果表明有显著的优化效果。     

关于工程公司走向国际市场的几点思考

介绍了国内工程公司向国际市场开拓过程中,应引起重视的一些问题及解决方法。     

冶金工程造价管理的发展趋势及对策

阐述了工程造价管理的基本内容及目标,介绍了冶金工程造价管理现状,提出了造价管理发展趋势及其对策。     

施工项目进度控制原理

通过分析影响施工项目进度的5大因素,得出了施工项目进度控制的6方面原理。     

选煤厂综合降噪方案浅析

分析了综合降噪方案确定的依据 ,需要考虑的因素。根据多年的实践经验 ,总结了主动性降噪措施和被动性降噪措施种类及其适用的条件 ,特别对吸声、隔声、消声的原理和降噪效果作了阐述 ,对生产实际具有特别重要的指导意义。     

武汉市地下工程的若干环境地质负效应

随着武汉市城市建设进程加快,地下空间开发利用所引起的环境地质问题日渐突出,本文针对城市地下工程建设所引发的工程环境地质负效应,分析其成灾原因,并结合其具有突发性、潜在性、隐蔽性、社会性等特点,提出了防治对策与建议,力图能使该问题引起人们的关注,对武汉市城市建设与地质环境保护、地质资源合理利用有积极意义。