Noise Propagation Through Open Windows Of Finite Depth Into An Enclosure,
2010
University of Nebraska-Lincoln
Noise Propagation Through Open Windows Of Finite Depth Into An Enclosure, Caleb Sieck, Siu-Kit Lau
Durham School of Architectural Engineering and Construction: Faculty Publications
Predicting the insertion loss of an opening backed with an enclosed space is important for building noise control. Recent research in sound transmission through apertures of finite depth in infinite rigid baffles has included the effects of propagating and evanescent modes within the aperture in order to extend models to higher frequencies. The present study extends the model to the case of the aperture backed by a cavity as opposed to sound radiating into half-space. The role of coupling between the aperture modes, radiation modes, and cavity modes in the transmission was investigated. The results were compared to those of …
Following Industry's Leed : Municipal Adoption Of Private Green Building Standards,
2010
University of Maine School of Law
Following Industry's Leed : Municipal Adoption Of Private Green Building Standards, Sarah B. Schindler
Faculty Publications
Local governments are beginning to require new, privately constructed and funded buildings to be “green” buildings. Instead of creating their own, locally-derived definitions of green buildings, many municipalities are adopting an existing private standard created by members of the building industry: LEED (Leadership in Energy and Environmental Design). This Article explains and assesses the privately promulgated LEED standards. It argues that the translation of LEED standards, which were intended to be voluntary, into law raises several theoretical and practical problems. Specifically, private green building ordinances that rely on LEED do not ensure a reduction in the negative local environmental impacts …
Evaluation Of A Web-Based Learning Tool For Teaching Gis Within The Context Of Transportation Engineering,
2010
Missouri University of Science and Technology
Evaluation Of A Web-Based Learning Tool For Teaching Gis Within The Context Of Transportation Engineering, Ashley Banaszek, Hong Sheng, Richard H. Hall, Ronaldo Luna, Ghulam Bham
Business and Information Technology Faculty Research & Creative Works
An Exploratory Study Was Conducted to Evaluate a Web-Based Learning Module for Teaching Geographic Information Systems to Civil Engineering Students within the Context of a Problem Related to Crash Data Analysis. This Module is One Part of a National Science Foundation Course, Curricula, and Laboratory Improvement Project in Which GIS Modules Are Being Developed for Several Areas of Civil Engineering. the Module Was Used as a Laboratory Assignment in a Transportation Engineering Course. Two Days Later Students Completed Both an Objective Multiple-Choice Quiz over the Material Covered in the Lab and a Subjective Questionnaire. Quantitative Analysis Was Carried Out on …
Optimum Absorption And Aperture Parameters For Realistic Coupled Volume Spaces Determined From Computational Analysis And Subjective Testing Results,
2010
University of Nebraska-Lincoln
Optimum Absorption And Aperture Parameters For Realistic Coupled Volume Spaces Determined From Computational Analysis And Subjective Testing Results, David T. Bradley, Lily M. Wang
Durham School of Architectural Engineering and Construction: Faculty Publications
This project utilizes computational modeling to study the effects of varying two architectural parameters, absorption ratio and aperture size, in a realistic coupled volume concert hall. Coupled volumes have been shown to exhibit non-exponential sound energy decay profiles, referred to as double slope effect. A number of objective metrics (T30/T15, LDT/T10, decay ratio, and ΔL) have been used to quantify the double slope effect of the profiles generated in the virtual hall. T30/T15 and LDT/T10 showed similar trends across all hall configurations, indicating decreasing double slope effect with increasing coupled volume absorption ratio for each aperture size, and producing highest …
Computational Modeling Of Effects Of Alloying Elements On Elastic Coefficients,
2010
Pennsylvania State University
Computational Modeling Of Effects Of Alloying Elements On Elastic Coefficients, Z. K. Liu, H. Zhang, S. Ganeshan, Y. Wang, S. N. Mathaudhu
Durham School of Architectural Engineering and Construction: Faculty Publications
Models for composition and temperature dependencies of single-crystal elastic stiffness coefficients are developed and applied to the Al12Mg17 and hexagonal closed-packed solution phases in the Mg–Al system based on data from first-principles calculations. In combination with models for multi-phases, the bulk, shear, and Young’s moduli of Mg–Al alloys are predicted and compared with available experimental data in the literature. It is noted that both phase transition and grain boundary sliding may play important roles in the elastic coefficients as a function of temperature.
Ab-10-017: Combined Effects Of Noise And Temperature On Human Comfort And Performance (1128-Rp),
2010
University of Nebraska-Lincoln
Ab-10-017: Combined Effects Of Noise And Temperature On Human Comfort And Performance (1128-Rp), Dale Tiller, Lily M. Wang, Amy Musser, Matthew Radik
Durham School of Architectural Engineering and Construction: Faculty Publications
This paper summarizes results from an experiment designed to investigate the combined effects of noise and temperature on human thermal comfort and task performance. Thirty subjects (16 females, 14 males) were exposed to all combinations of five thermal conditions (PMV +1 [79.6°F:26.4°C], PMV +0.5 [75.8°F:24.3°C], PMV 0 [72.1°F:22.3°C], PMV -0.5 [68.3°F:20.2°C], and PMV -1 [64.6°F:18.1°C]), three RC noise levels (RC-30, RC-40, and RC-50), and two sound qualities (neutral and rumbly): all sounds mimicked noise from building ventilation systems. After a one-hour adaptation period at each condition, subjects rated their thermal comfort using the ASHRAE Thermal Comfort Scale and the Tenant …
Ab-10-019: Human Performance And Perception-Based Evaluations Of Indoor Noise Criteria For Rating Mechanical System Noise With Time-Varying Fluctuations (1322-Rp),
2010
University of Nebraska - Lincoln
Ab-10-019: Human Performance And Perception-Based Evaluations Of Indoor Noise Criteria For Rating Mechanical System Noise With Time-Varying Fluctuations (1322-Rp), Lily M. Wang, Cathleen C. Novak
Durham School of Architectural Engineering and Construction: Faculty Publications
The goal of this study was to investigate the effects of noise from building mechanical systems with time-varying fluctuations on human task performance and perception, and to determine how well current indoor noise rating methods account for this performance and perception. Six different noise conditions with varying degrees of time-varying fluctuations, many focused in the low frequency rumble region, were reproduced in an office-like setting. Thirty participants were asked to complete typing, grammatical reasoning, and math tasks plus subjective questionnaires, while being exposed for approximately one hour to each noise condition. Results show that the noise conditions with higher sound …
Concrete Slender Wall Design – Back To The Future,
2010
California Polytechnic State University - San Luis Obispo
Concrete Slender Wall Design – Back To The Future, John W. Lawson, James Lai
Architectural Engineering
Slender concrete walls incorporated into tilt-up construction
over the past 60 years have performed remarkably well under
out-of-plane wind and seismic loads. While issues associated
with seismic wall anchorage gave this form of construction a
black-eye in the early days, the concrete walls themselves
have always performed very well even as far back as their
first use in the early 1900s. Yet the height-to-thickness
limitations in 1985 and earlier model building codes were
proved irrational and were removed. We as engineers expect
building codes to evolve and advance the state of the art with
each successive edition. The latest edition …
The Thinking Hand: Book Review,
2010
Technological University Dublin
The Thinking Hand: Book Review, Jim Roche
Articles
In this new book Juhani Pallasmaa continues his phenomenological exploration begun in ‘The Eyes of the Skin (2005)’, with the ‘Thinking Hand’ here proffered as a metaphor for his contention that all our senses, have innate imbedded crucial skills which help us perform the most basic daily tasks – and to create inspired works of art and architecture.
Feasibility Study Of Solar Driven Underground Cooling System,
2010
University of Nebraska-Lincoln
Feasibility Study Of Solar Driven Underground Cooling System, Michel E. Shafik
Durham School of Architectural Engineering and Construction: Dissertations, Theses, and Student Research
In the United States the peak electrical use occurs during the summer. In addition, the building sector consumes a major portion of the annual electrical energy consumption. One of the main energy consuming components in the building sector is the Heating, Ventilation, and Air-Conditioning (HVAC) systems. This research studies the feasibility of implementing a solar driven underground cooling system that could contribute to reducing building cooling loads. The developed system consists of an Earth-to-Air Heat Exchanger (EAHE) coupled with a solar chimney that provides a natural cool draft to the test facility building at the Solar Energy Research Test Facility …
Diapycnal Diffusivities In Homogeneous Stratified Turbulence,
2010
Missouri University of Science and Technology
Diapycnal Diffusivities In Homogeneous Stratified Turbulence, D. D. Stretch, S. K. Venayagamoorthy
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Quantifying diapycnal mixing in stably stratified turbulence is fundamental to the understanding and modeling of geophysical flows. Data of diapycnal mixing from direct numerical simulations of homogeneous stratified turbulence and from grid turbulence experiments, are analyzed to investigate the scaling of the diapycnal diffusivity. In these homogeneous flows the instantaneous diapycnal diffusivity is given exactly by Kd= ∈ρ/ (∂ ρ /∂z)2where ∈ρ is the dissipation rate of density fluctuations, and ∂ ρ /∂z is the mean density gradient. The diffusivity Kd may be expressed in terms of the large-scale properties of the turbulence as K d = γLE …
High-Strength Selfconsolidating Concrete Girders Subjected To Elevated Compressive Fiber Stresses, Part 1: Prestress Loss And Camber Behavior,
2010
Missouri University of Science and Technology
High-Strength Selfconsolidating Concrete Girders Subjected To Elevated Compressive Fiber Stresses, Part 1: Prestress Loss And Camber Behavior, Jared E. Brewe, John J. Myers
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The design of prestressed concrete members is restricted by the requirement that the extreme compressive fiber stress at midspan of simply supported members be less than 60% of the concrete compressive strength at release of prestressing. the purported purpose of this limit is to address serviceability performance, but it places unnecessary limits on the capability of the materials. for this research program, six prestressed concrete girders were produced with high-strength self-consolidating concrete and subjected to compressive fiber stress levels ranging from 65% to 84% of the concrete compressive strength at release of prestressing. Time dependent concrete surface strains were measured …
Modeling Permanent Deformation Of Unbound Granular Materials Under Repeated Loads,
2010
Missouri University of Science and Technology
Modeling Permanent Deformation Of Unbound Granular Materials Under Repeated Loads, Cheng Chen, Louis Ge, Jiansheng Zhang
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Finite-element analysis on a pavement structure under traffic loads has been a viable option for researchers and designers in highway pavement design and analysis. Most of the constitutive drivers used were nonlinear elastic models defined by empirical resilient modulus equations. Few isotropic/kinematic hardening elastoplastic models were used but applying thousands of repeated load cycles became computationally expensive. in this paper, a cyclic plasticity model based on fuzzy plasticity theory is presented to model the long-term behavior of unbound granular materials under repeated loads. the discussion focuses on the model parameters that control long-term behavior such as elastic shakedown. the performance …
Special Issue On Modeling In Geotechnical Engineering For Design And Materials,
2010
Missouri University of Science and Technology
Special Issue On Modeling In Geotechnical Engineering For Design And Materials, R. A. Tarefder, D. H. Chen, Y. N. Ge
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
No abstract provided.
Finite Element Modeling Of A Field-Scale Shored Mechanically Stabilized Earth Wall,
2010
Missouri University of Science and Technology
Finite Element Modeling Of A Field-Scale Shored Mechanically Stabilized Earth Wall, Cheng Chen, Louis Ge, Jia Sheng Zhang
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The shored mechanically stabilized earth (SMSE) walls are typically used in steep terrain to allow construction of a new road or widening of an existing narrow-road by constructing the wall on the outboard of the roadway. the state-of-practice suggests a minimum bench width and MSE reinforcement length equivalent to seventy percent of the design height of the MSE wall. It has been shown recently that shorter reinforcement length is sufficient when the SMSE wall system is constructed, and the retaining benefits provided by the shoring component should be taken into consideration. in this paper, a finite element analysis is performed …
Control Force Estimation In Seismic Building Design,
2010
Missouri University of Science and Technology
Control Force Estimation In Seismic Building Design, Xiaozhe Zhang, Franklin Y. Cheng
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This paper presents two approaches of estimating the control force magnitude in the building structure's seismic design. One is by spectrum average in frequency domain, and the other is by nondeterministic Monte Carlo analysis in time domain. the spectrum method is proposed to find the estimation by averaging the system's frequency response with an earthquake spectrum as a weighting factor. the nondeterministic method is based on sets of potential ground motions generated numerically. the approaches are developed in the concept of performance design, with studies based on the site potential seismic hazard and presenting results at different levels of displacement …
Simulation Prototyping Of An Experimental Solar House,
2010
Missouri University of Science and Technology
Simulation Prototyping Of An Experimental Solar House, Anna Osborne, Stuart Baur, Katie Grantham
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This paper presents a comparative analysis between an energy simulation model and an actual solar home. the case study used was the Team Missouri's 2009 Solar Decathlon entry. the home was evaluated using the predicted data developed with the use of Energy-10 Version 1.8. the software simulates the energy use performance of building strategies ranging from building envelope and system efficiency options. the performance data used was collected during the 2009 Solar Decathlon competition. Results comparing energy efficient strategies, consumption and generation are explored with future implications discussed. © 2010 by the authors.
Guide To Stones Used For Houses Of Worship In Northeastern Ohio,
2010
Cleveland Museum of Natural History
Guide To Stones Used For Houses Of Worship In Northeastern Ohio, Joseph T. Hannibal
Cleveland Memory
The purpose of this guide is to serve as an introduction and field guide to the stone used for Northeastern Ohio’s sacred landmarks. compiling this information are noted. Both exterior and interior stones are described. Locations are given so that visitors can find various interior features. Finally, interesting facts having to do with the stones are given in a remarks section and references to sources used. Original publication date 1999.
