检索结果-内蒙古大学图书馆

Construction Research Congress 2012: Construction Challenges in a Flat World

作者： Esmaeili, Behzad Hallowell, Matthew Construction Engineering and Management Program Department of Civil Environmental and Architectural Engineering University of Colorado at Boulder 428 UCB 1111 Engineering Drive Boulder CO 80309-0428 United States

ISBN: (纸本)9780784412329

Struck-by injuries are a leading proximal cause of fatal injuries and are usually caused by a falling or suspended objects and contact between workers and heavy equipment. As with other injuries, struck-by risks are most effectively mitigated early in the planning phases of a project. Among different methods of preconstruction safety management, safety risk modeling and integration has been shown to be highly effective. To enhance the current preconstruction safety management methods, the authors utilized an attribute-based risk identification and analysis method that helps designers and preconstruction planners to identify and model safety risk independently of specific activities or building components. In order to identify the attributes that contribute to struck-by incidents and quantify their relative risks, over 300 injury reports from the National databases reviewed. In total, 34 attributes were identified and their risks were then quantified. It was found that working under or near lifted loads (15.6%), working with heavy equipment (17.1%), workers on foot and moving equipments (13.5%) are the most hazardous attributes that lead to struck-by accidents. The results can be used by practitioners to integrate robust safety risk data into project designs, schedules, building information models, and pre-task plans. © 2012 ASCE.

关键词： Accidents

来源：评论

学校读者我要写书评

暂无评论

Comparing real-time ultraviolet-induced fluorescence with hexosaminidase activity for assessing airborne fungal spore loads in occupied K-12 classrooms 15

Comparing real-time ultraviolet-induced fluorescence with he...

引用

15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018

作者： Nieto-Caballero, Marina Gomez, Odessa M. Shaughnessy, Richard J. Hernandez, Mark Civil Environmental and Architectural Engineering University of Colorado Boulder United States Indoor Air Program University of Tulsa Oklahoma United States

ISBN: (纸本)9781713826514

The goal of this demonstration study was to compare fluorescent aerosol cytometry with select enzyme activity for their ability to assess the airborne loads of fungal biomass in occupied settings. Within the same suburban area and season, simultaneous collocated measurements, targeting airborne fungal concentrations, were acquired from 28 occupied classrooms in 11 different public schools. As judged by ANOVA and Spearman's ranking, a statistically significant association was observed between results from these different analytical methods. © 2018 15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018. All rights reserved.

关键词： Enzyme activity

来源：评论

学校读者我要写书评

暂无评论

Embodied energy and carbon emissions of DOE prototype buildings from a life cycle perspective

Embodied energy and carbon emissions of DOE prototype buildi...

引用

2020 ASHRAE Virtual Conference

作者： Arehart, Jay H. Srubar, Wil V. Pomponi, Francesco D’Amico, Bernardino The Department of Civil Environmental and Architectural Engineering University of Colorado Boulder BoulderCO United States The Department of Civil Environmental and Architectural Engineering Materials Science and Engineering Program University of Colorado Boulder BoulderCO United States The School of Engineering and Built Environment Edinburgh Napier University Edinburgh United Kingdom

ISBN: (纸本)9781947192621

While the reduction of operational energy and associated emissions has been the focus of the building design community in recent decades, focus must now be given to reducing the upfront or embodied energy and emissions of buildings. Embodied energy and emissions are those associated with the extraction, manufacturing, transportation, and end-of-life of building materials and assemblies. The present study evaluates, using life cycle assessment, the "cradle-to-gate" embodied energy and embodied carbon of the Office and Apartment ASHRAE 90.1-2016 DOE Prototype Buildings. Results from this analysis show that on average, the office prototype buildings consumed 938 MJ/m2 (82.6 kBtu/ft2) of embodied energy and emitted 77.0 kg CO2e/m2(15.7 lb CO2e/ft2) of embodied carbon. The apartment prototype buildings consumed 1168 MJ/m2 (103 kBtu/ft2) of embodied energy and emitted 102 kg CO2e/m2 (20.9 lb CO2e/ft2) of embodied carbon on average. This study serves as a first step towards establishing reference building models for embodied carbon so that the building design community can realize a zero-carbon built environment by 2050. © 2020 Amer. Soc. Heating, Ref. Air-Conditoning Eng. Inc.. All rights reserved.

关键词： Life cycle

来源：评论

学校读者我要写书评

暂无评论

Accuracy tests for simulations of constant volume, dual duct, and variable volume air-handling systems

Accuracy tests for simulations of constant volume, dual duct...

引用

American Society of Heating, Refrigerating and Air-Conditioning Engineers, ASHRAE 2005 Annual Meeting

作者： Yuill Ashrae, G.K. Haberl, J.S. Caldwell, J.S. ASHRAE Architectural Engineering Program University of Nebraska Lincoln Texas A and M University College Station TX James Posey Associates Baltimore MD

This paper provides a method for verifying the accuracy of computer models that simulate the performance of the air-handling components of three types of heating, ventilating, and air-conditioning systems: the constant volume terminal reheat system, the constant volume dual duct system, and the variable air volume system. To accomplish this, a detailed description of each system and its operating parameters was developed and a set of eight test conditions was generated, consisting of carefully chosen space loads and weather conditions. Each of the systems was simulated at each of the defined conditions. The thermodynamic properties at each point in the system and the heating and cooling coil loads were calculated. The calculations were then repeated by a second analyst using an independently developed program. The maximum deviation in the coil loads was 1.9%, and the average was 0.14%. These validated results can be used by program developers or users to test the performance of the air-side simulations contained in most building energy analysis computer programs. © 2005 ASHRAE.

关键词： Air conditioning

来源：评论

学校读者我要写书评

暂无评论

Dynamic fracture process analysis of rock subjected to stress wave and gas pressurization

引用

International Journal of Rock Mechanics and Mining Sciences 2004年第SUPPL. 1期41卷 2A201-8页

作者： Cho, S.H. Nakamura, Y. Kaneko, K. 21st COE Program Graduate School of Engineering Hokkaido University Sapporo Japan Dept. of Civil/Architectural Eng. Yatsushiro Natl. College of Tech. Kumamoto Japan Graduate School of Engineering Hokkaido University Sapporo Japan

The present paper proposes a new dynamic fracture process analysis that is able to simulate dynamic fracture process, considering the complexities of the interaction of stress wave and crack propagation, gas pressurization in the cracks, crack geometries such as crack opening displacement and crack length, etc. A conventional dynamic fracture process analysis based on the dynamic finite element and fracture mechanic is coupled with a developed finite difference scheme for gas flow through the fractures. A network model is used to combine the two analyses. In order to search the fractures connected with the blasthole, a crack search algorithm is devised. To consider the gas flowing through the fractures, the onedimensional transient flow governed by conservation of mass and momentum and the detailed crack geometries for the gas flow are considered. The dynamic fracture mechanisms due to both stress wave and gas pressurization in blasting are investigated and discussed. To validate the proposed analysis, the predicted gas flow was compared with the observed gas flow due to the detonation of explosive. © 2004 Elsevier Ltd.

关键词： Rocks

来源：评论

学校读者我要写书评

暂无评论

Measuring sound power in ducted heating, ventilating, and air-conditioning (HVAC) systems for use in verifying acoustical prediction methods

Measuring sound power in ducted heating, ventilating, and ai...

引用

AEI 2006

作者： Ryherd, Steven R. Wang, Lily M. Architectural Engineering Program University of Nebraska - Lincoln PKI 1110 S. 67th St. Omaha NE 68182

ISBN: (纸本)0784407983

This paper discusses issues regarding in-situ methods of obtaining sound power at a point in a heating, ventilating and air-conditioning (HVAC) duct system. Such a method is being used as part of a larger investigation on acoustical prediction methods to allow for comparison of measured data to results from attenuation predictions of individual duct elements, such as elbows or dampers. Sound propagation in HVAC duct work is complex. Any measurements of sound energy in the duct must address the characteristics of sound propagation in ducts, end reflections, and air turbulence. Investigations are being conducted to understand the extents to which these acoustical issues affect measurement results. The study provides a better understanding of sound propagation in HVAC ducts for future investigation of acoustical prediction methods. Copyright ASCE 2006.

关键词： architectural acoustics

来源：评论

学校读者我要写书评

暂无评论

Comparison Between Predicted Duct Effectiveness from Proposed ASHRAE Standard 152P and Measured Field Data for Residential Forced Air Cooling Systems

Comparison Between Predicted Duct Effectiveness from Propose...

引用

ASHRAE 2003 Winter Meeting CD, Technical and Symposium Papers

作者： Siegel, Jeffrey A. McWilliams, Jennifer A. Walker, Iain S. Architectural Engineering Program Department of Civil Engineering University of Texas Austin TX Ener. Performance of Buildings Group Lawrence Berkeley Natl. Laboratory Berkeley CA

The proposed ASHRAE Standard 152P, "Method of Test for Determining the Design and Seasonal Efficiencies of Residential Thermal Distribution Systems" (ASHRAE 2002), has recently completed its second public review, Aspart of the standard development process, this study compares the forced air distribution system ratings to measured field results. Fifty-eight field tests were performed on cooling systems in eleven homes in the summers of 1998 and 1999, Seven of these houses had standard attics with insulation on the attic floor and a well-vented attic space. The other four houses had unvented attics where the insulation is placed directly under the roof deck, and the attic space is not deliberately vented. Each house was tested under a range of summer weather conditions at each particular site and, in some cases, the amount of duct leakage was intentionally varied. The comparison between predicted efficiencies and the measured results includes evaluation of the effects of weather, duct location, thermal conditions, duct leakage, and system capacity. The results showed that the difference between measured results and those calculated using proposed Standard 152P is about 5 percentage points on average if weather data, duct leakage, and air handler flow are well known. However, the accuracy of the standard is strongly dependent on having good measurements of duct leakage and system airflow. Given that the uncertainty in the measured results is typically also about 5 percentage points, the Standard 152P results are acceptably close to the measured data.

关键词： Air conditioning ducts

来源：评论

学校读者我要写书评

暂无评论

Machine learning in concrete science:applications,challenges,and best practices

引用

npj Computational Materials 2022年第1期8卷 1192-1208页

作者： Zhanzhao Li Jinyoung Yoon Rui Zhang Farshad Rajabipour Wil V.Srubar III Ismaila Dabo Aleksandra Radlińska Department of Civil and Environmental Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA Department of Structural Engineering Research Korea Institute of Civil Engineering and Building Technology(KICT)Goyang-si10223Republic of Korea Department of Civil Environmentaland Architectural EngineeringUniversity of Colorado BoulderBoulderCO80309USA Materials Science and Engineering Program University of Colorado BoulderBoulderCO80309USA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA

Concrete,as the most widely used construction material,is inextricably connected with human *** conceptual and methodological progress in concrete science,concrete formulation for target properties remains a challenging task due to the ever-increasing complexity of cementitious *** the ability to tackle complex tasks autonomously,machine learning(ML)has demonstrated its transformative potential in concrete *** the rapid adoption of ML for concrete mixture design,there is a need to understand methodological limitations and formulate best practices in this emerging computational ***,we review the areas in which ML has positively impacted concrete science,followed by a comprehensive discussion of the implementation,application,and interpretation of ML *** conclude by outlining future directions for the concrete community to fully exploit the capabilities of ML models.

关键词： concrete directions autonomous

来源：评论

学校读者我要写书评

暂无评论

engineering project organization: defining a line of inquiry and a path forward

引用

engineering Project Organization Journal 2011年第1期1卷 3-10页

作者： Paul Chinowsky Civil Systems Program Department of Civil Environmental and Architectural Engineering University of Colorado

The formalization of a line of inquiry requires three elements: a foundational definition, an operational context and a path forward to guide researchers within the domain. In this initial Pathfinding paper, these elements are addressed for the engineering project organization line of inquiry. The field of engineering project organization research is put forth as a distinct pursuit within the overall field of organization research. In this distinct domain, engineering, social science, business and public policy are integrated as foundational pillars within the context of infrastructure development and the requirement to meet multiple levels of stakeholder requirements. The paper puts forth the argument that traditional perspectives of project-based organizations and project management are no longer sufficient to address the challenges of an evolving global economy, focus on environmental concerns and multi-cultural projects. Rather, it is necessary to forge a new path that embraces interdisciplinary perspec- tives as a basis for studying engineering organizations at all levels. From this basis, a path forward and a specific set of milestones are specified that should be measured and achieved by the engineering Project Organization community as it solidifies engineering project organization research as the next generation of interdisciplinary research within a project-based context. Finally, a charge is given to the community to collaborate while devel- oping novel insights and challenging entrenched beliefs and modes of inquiry in both industry and academia.

关键词： engineering organizations interdisciplinary research project organizations

来源：评论

学校读者我要写书评

暂无评论

Information representation schema for tower crane planning in building construction projects

Information representation schema for tower crane planning i...

引用

2015 ASCE International Workshop on Computing in Civil engineering, IWCCE 2015

作者： Ji, Yuanshen Leite, Fernanda Construction Engineering and Project Management Program Department of Civil Architectural and Environmental Engineering University of Texas at Austin 1 University Station C1752 AustinTX78712 United States Construction Engineering and Project Management Program Department of Civil Architectural and Environmental Engineering University of Texas at Austin 301 E Dean Keeton St. Stop C1752 AustinTX78712-1094 United States

ISBN: (数字)9780784479247

ISBN: (纸本)9780784479247

Given the uniqueness and diversity of constraints from each construction site, tower crane planning can be a challenging task, especially in terms of collecting and presenting multiple sets of information with varying levels of detail. Several research studies have been carried out to investigate information categories necessary for tower crane planning. This paper investigates challenges related to information representation of tower crane planning in a computational environment. Also, a site-specific information representation schema for tower crane planning is presented. Requirements and information resources for each category of information are specified with the objective of visualizing and automating tower crane planning. This information representation schema was tested on a building construction project and is subject to continuous refinement based on additional case studies of building construction projects that have different characteristics and constraints. Uniqueness from individual projects is expected;however, critical constraints and characteristics are commonly shared by the entire building construction field. © 2015 ASCE.

关键词： Towers

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：