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Field Performance Of A Conventional Combine Harvester In Harvesting Bg-300 Paddy Variety In Batticaloa, Srilanka, Innovative Research Publications IRP India, R. Bawatharani, D.N. Jayatissa, D.A.N. Dharmasena, M.H.M.A. Bandara 2015 Innovative Research Publications

Field Performance Of A Conventional Combine Harvester In Harvesting Bg-300 Paddy Variety In Batticaloa, Srilanka, Innovative Research Publications Irp India, R. Bawatharani, D.N. Jayatissa, D.A.N. Dharmasena, M.H.M.A. Bandara

Innovative Research Publications IRP India

This study was performed to determine the performance of a conventional combine harvester in two fields cultivated with BG-300 rice variety in SriLanka. The performance of the combine was affected by the operational condition as wells as the crop conditions in both fields


Determining Thresholds Of Annoyance To Tones In Noise, Jennifer Marie Francis 2014 University of Nebraska-Lincoln

Determining Thresholds Of Annoyance To Tones In Noise, Jennifer Marie Francis

Architectural Engineering -- Dissertations and Student Research

Building services equipment often produce noise with prominent tones that can lead to complaints from occupants in the built environment. Previous studies have investigated human perception to tones in noise but it is still unclear at what threshold of prominence these tones lead to human annoyance. The goal of this research is to apply two different methods towards defining thresholds of annoyance to two tonal frequencies: 125 Hz and 500 Hz. In Method I – Direct Assessment with Task, subjects are exposed to 10 minutes of broadband noise with a tonal frequency set at a certain level of prominence while completing ...


Designing Acoustics For Linguistically Diverse Classrooms: Effects Of Background Noise, Reverberation And Talker Foreign Accent On Speech Comprehension By Native And Non-Native English-Speaking Listeners, Z. Ellen Peng 2014 Durham School of Architectural Engineering and Construction, University of Nebraska

Designing Acoustics For Linguistically Diverse Classrooms: Effects Of Background Noise, Reverberation And Talker Foreign Accent On Speech Comprehension By Native And Non-Native English-Speaking Listeners, Z. Ellen Peng

Architectural Engineering -- Dissertations and Student Research

The current classroom acoustics standard (ANSI S12.60-2010) recommends core learning spaces not to exceed background noise level (BNL) of 35 dBA and reverberation time (RT) of 0.6 second, based on speech intelligibility performance mainly by the native English-speaking population. Existing literature has not correlated these recommended values well with student learning outcomes. With a growing population of non-native English speakers in American classrooms, the special needs for perceiving degraded speech among non-native listeners, either due to realistic room acoustics or talker foreign accent, have not been addressed in the current standard. This research seeks to investigate the effects ...


Wheeler, Andrea (2014) “The Sustainable School: Effective And Energy Efficient Ventilation In The Classroom, And The Question Of Educational Performance And Wellbeing” World Sustainable Building Conference, 28th – 30th October, Barcelona., Andrea S. Wheeler 2014 Iowa State University

Wheeler, Andrea (2014) “The Sustainable School: Effective And Energy Efficient Ventilation In The Classroom, And The Question Of Educational Performance And Wellbeing” World Sustainable Building Conference, 28th – 30th October, Barcelona., Andrea S. Wheeler

Andrea S. Wheeler

Abstract: Within the context of designing a sustainable school, technical studies that address questions of air quality, educational performance and wellbeing challenge the trend toward providing for natural ventilation. This paper critically examines research literature that suggests that temperature and air quality are, in a large proportion of classrooms, so poor as to have a negative effect on children’s health and educational performance. Evidence in support of mechanical systems that control air quality contradicts a recent increase in natural ventilation, proposed as a means to conserve energy consumption in schools. Indoor Air Quality (IAQ) is generally not stressed, or ...


Ogden College News, Cheryl Stevens, Dean 2014 Ogden College of Science & Engineering

Ogden College News, Cheryl Stevens, Dean

Ogden College of Science & Engineering Publications

No abstract provided.


Wind-Induced Pressures In Air Permeable, Double-Layer Roof Systems In Regions Of Separated Flow, Jeong Hee Oh 2014 The University of Western Ontario

Wind-Induced Pressures In Air Permeable, Double-Layer Roof Systems In Regions Of Separated Flow, Jeong Hee Oh

University of Western Ontario - Electronic Thesis and Dissertation Repository

This thesis is concerned with the wind-induced pressure distribution acting on air permeable, double-layer roof systems placed on low-rise buildings. Because of the pressure transmission into the cavity between layers, the pressure difference in the double-layer systems differs significantly from that in a single layer. The interior pressures (in the cavity between layers) are highly correlated with external pressures at the openings on the external surface of the outer layer and thereby, the net wind load for the design of the outer layer is considerably reduced by the pressure equalization between the external and internal surfaces of the outer layer ...


Recapturing Urban Space: An Inhabited Bridge In Nashville, Tennessee, Benjamin Smith Culbertson 2014 University of Tennessee - Knoxville

Recapturing Urban Space: An Inhabited Bridge In Nashville, Tennessee, Benjamin Smith Culbertson

Masters Theses

Density. A word used in the description of many large cities. It is how so many people can fit into a relatively compact area and still operate efficiently. Density, used as a tool to craft cities can generate spectacular moments. Several centuries ago, one of these moments was the inhabited bridge. It provided the continuity of the urban fabric by linking areas that were separated by rivers and other natural boundaries. They were nodes in the city that housed commerce, social activity, and residences. However, as cities grew to be more globally connected hubs, the needs of the pedestrian fell ...


Examining The Applicability Of Design Methods For Large Panelized All-Wood Roof Diaphragms Under Seismic Loading, W. Pang, S. Pant, C. Ni, John W. Lawson 2014 Clemson University

Examining The Applicability Of Design Methods For Large Panelized All-Wood Roof Diaphragms Under Seismic Loading, W. Pang, S. Pant, C. Ni, John W. Lawson

Architectural Engineering

The use of flexible roof diaphragms is very common in the United States, both for residential buildings and large-scale commercial buildings. Due to its simplicity, the traditional diaphragm design method is commonly used in diaphragm design, in particular for the design of diaphragms with relatively small dimensions. The traditional diaphragm design method assumes the axial chord forces developed in framing members under in-plane loading are carried only by the perimeter elements. The traditional diaphragm design method has always been thought to be a conservative design method, especially when applied to large diaphragms. In recent years, the engineering community began to ...


Numerical Framework For Seismic Collapse Assessment Of Rigid Wall-Flexible Diaphragm Structures, M. Koliou, A. Filiatrault, D.J. Kelly, John W. Lawson 2014 SUNY Buffalo

Numerical Framework For Seismic Collapse Assessment Of Rigid Wall-Flexible Diaphragm Structures, M. Koliou, A. Filiatrault, D.J. Kelly, John W. Lawson

Architectural Engineering

This study focuses on the development of a two dimensional (2D) simplified numerical framework of rigid wall-flexible diaphragm (RWFD) structures that can be used to validate seismic design approaches. This type of low-rise industrial buildings, which is widely used in North America, incorporates rigid in-plane concrete or masonry walls and flexible in-plane wood, steel or “hybrid” roof diaphragms. The numerical modeling is detailed enough to capture the nonlinear seismic response of RWFD buildings, but simplified enough to efficiently conduct a large number of nonlinear time-history dynamic analyses. The 2D numerical modeling framework is based on a three step sub-structuring approach ...


Development Of Seismic Design Methodologies For Rigid Wall-Flexible Diaphragm Structures, John W. Lawson, D. J. Kelly, M. Koliou, A. Filiatrault 2014 California Polytechnic State University, San Luis Obispo

Development Of Seismic Design Methodologies For Rigid Wall-Flexible Diaphragm Structures, John W. Lawson, D. J. Kelly, M. Koliou, A. Filiatrault

Architectural Engineering

Evidence indicates that the dynamic behavior of Rigid Wall – Flexible Diaphragm (RWFD) structures is dominated by the diaphragm’s response instead of the walls’ response, and this is a significant departure from the underlying assumptions of the widely used equivalent lateral force method in current building codes. RWFD buildings are common in North America and other parts of the world, and incorporate rigid in-plane concrete or masonry walls and flexible in-plane wood or steel roof diaphragms. With the use of a numerical computer modeling framework developed specifically for this type of building, this study sets out to investigate the seismic ...


Coastal Defenses, U.S., Bert Chapman 2014 Purdue University

Coastal Defenses, U.S., Bert Chapman

Libraries Faculty and Staff Scholarship and Research

Provides an overview of U.S. military coastal defenses during the period up to and including the War 1812.


An Emerging Vocabulary: Architecture Of Performance, Jeremy H. Stock 2014 University of Kentucky

An Emerging Vocabulary: Architecture Of Performance, Jeremy H. Stock

Kaleidoscope

Re-chartered at the University of Kentucky in 2005, the Triangle Fraternity – a brotherhood of students studying Architecture, Engineering, and Sciences – now seeks to establish a visible presence by building a new fraternity house on-campus. To enable this investigation, professors Gregory Luhan, Peyman Jahed, and Bruce Walcott developed a design + energy studio experience that provided a framework for an integrated design team to use a systems-thinking approach to generate a range of scalable, net-zero energy prototypes. These prototypes can be applied in a variety of contexts and have the potential to address larger issues, such as energy efficiency and environmental stewardship ...


Validation Of A Fault-Modeling Equipped Vapor Compression System Model Using A Fault Detection And Diagnostics Evaluation Tool, David P. Yuill, Howard Cheung, James E. Braun 2014 University of Nebraska-Lincoln

Validation Of A Fault-Modeling Equipped Vapor Compression System Model Using A Fault Detection And Diagnostics Evaluation Tool, David P. Yuill, Howard Cheung, James E. Braun

David Yuill

A methodology for evaluating the performance of fault detection and diagnostics (FDD) tools for unitary air- conditioners has been developed (Yuill and Braun 2013). The methodology uses laboratory measurements of systems with and without faults to test FDD tools’ effectiveness. A gray box modeling method capable of modeling systems with faults was developed by Cheung and Braun (2013a and 2013b) to provide input data, as an alternative to using laboratory data that had been collected. The simulation method was validated by direct comparison with experimental data, but a comparison of FDD evaluation results provides a more direct and useful validation ...


Using K’Nex To Teach Large Scale Structures To Architects And Constructionstudents, Allen C. Estes, Craig Baltimore 2014 California Polytechnic State University - San Luis Obispo

Using K’Nex To Teach Large Scale Structures To Architects And Constructionstudents, Allen C. Estes, Craig Baltimore

Architectural Engineering

The College of Architecture and Environmental Design at California Polytechnic State University in San Luis Obispo (Cal Poly SLO) is the only college in the nation that includes architecture (ARCH), architectural engineering (ARCE) and construction management (CM) programs in the same college. Given the unique mix of disciplines and the emphasis on interdisciplinary collaboration, the ARCH and CM students take a five-course structural engineering sequence from the ARCE department. A challenge of these courses is to maintain some degree of computational rigor while offering a broader perspective that will benefit the ARCH and CM students. This paper reports on one ...


Structural Damage Detection Utilizing Experimental Mode Shapes, Evan Jamison Gerbo 2014 Cal Poly, SLO

Structural Damage Detection Utilizing Experimental Mode Shapes, Evan Jamison Gerbo

Master's Theses and Project Reports

A method of locating structural damage is developed and tested to aid in the evaluation of structural health. This method will help minimize the cost of structural inspection and repair by informing engineers of where damage, due a seismic event, has occurred before the removal of finishes for visual inspection. This thesis begins to answer the question “can structural damage be detected solely through analysis of experimentally measured mode shapes?”

The work encompasses construction of a test structure, with three braces that can be repeatedly engaged or dis-engaged, thus allowing for testing of a variety of braced configurations. For this ...


Effects Of Polyethylene Terephthalate Fibers In The Water Resistance Of Compressed Stabilized Earth Blocks., Ebrima Colley 2014 University of Nebraska-Lincoln

Effects Of Polyethylene Terephthalate Fibers In The Water Resistance Of Compressed Stabilized Earth Blocks., Ebrima Colley

Architectural Engineering -- Dissertations and Student Research

This research project focuses on investigating the effects of synthetic fibers (PET) and amount of cement stabilization on the water absorption, water surface erosion, and wet compressive strength of the compressed stabilized earth blocks (CSEB). The use of locally available soils blended with fibers and cement was investigated to obtain a design mix for compressed stabilized earth blocks capable of staying intact in wet and humid regions in the world (i.e. regions with annual rainfall of over 50 in). Blocks with varying cement percentages of 5, 8, 10, and 15% by weight were produced with 3 specimens each, with ...


Mesure Du Coefficient D’Absorption De Matériaux Poreux Sous Champ Acoustique Diffus Synthétique, Olivier Robin, Alain Berry, Olivier Doutres Ph.D., Noureddine Atalla 2014 University of Sherbrooke, GAUS

Mesure Du Coefficient D’Absorption De Matériaux Poreux Sous Champ Acoustique Diffus Synthétique, Olivier Robin, Alain Berry, Olivier Doutres Ph.D., Noureddine Atalla

Olivier Doutres Ph.D.

Cette communication décrit une méthode expérimentale pour l’estimation du coefficient d’absorption de matériaux absorbants sous un champ acoustique diffus synthétisé dans des conditions de champ libre. Des comparaisons sont réalisées entre des résultats expérimentaux obtenus via cette méthode et celle standardisée de la chambre réverbérante, ainsi qu’avec des simulations numériques basées sur la méthode des matrices de transfert. En utilisant des surfaces de matériaux inférieures à celles requises pour la méthode standardisée, les valeurs de coefficient d’absorption obtenues ne présentent pas les surestimations liées aux effets de taille de l’échantillon vues dans le cas de ...


Spans Across Time: Compliance Of Historic Maine Coastal Bridges With Modern Geometric Design Standards, Elizabeth Reynolds 2014 University of Maine - Main

Spans Across Time: Compliance Of Historic Maine Coastal Bridges With Modern Geometric Design Standards, Elizabeth Reynolds

Honors College

The purpose of this thesis is to study a wide range of historic bridges along the coast of Maine. Three bridges were selected for study: Sewall’s Bridge, Bailey Island Bridge, and Deer Isle-Sedgwick Bridge. The selected bridges exhibit varying historic treatment approaches, material use, structure type, and span length. This thesis establishes the compliance of these bridges with modern geometric standards, as defined by AASHTO (2011), including maximum grade, vertical and horizontal alignment, roadway width, and sidewalk width. Passing sight distance, passenger comfort and general appearance are not be included in this evaluation of geometric design.

This document outlines ...


Performance Of No Vibration/No Admixture Masonry Grout Containing High Replacement Of Portland Cement With Fly Ash And Ground Granulated Blast Furnace Slag, Eric Bateman 2014 California Polytechnic State University - San Luis Obispo

Performance Of No Vibration/No Admixture Masonry Grout Containing High Replacement Of Portland Cement With Fly Ash And Ground Granulated Blast Furnace Slag, Eric Bateman

Master's Theses and Project Reports

When hollow concrete masonry is used for construction in high seismic regions, structural designs typically require fully grouted walls. The grouting process is labor-intensive, time-consuming and has a high energy demand due to requirements of consolidation in each and subsequent grout lifts. Self-consolidating grout with admixtures has been successfully used without segregation in walls of up to 12.67 ft. in height. Investigation of self-consolidating grout mixes without admixtures has potential for sustainability improvement.

This thesis reports on the compression strength and consolidation observations of self-consolidating characteristics of no vibration/no admixture grout made by substituting various proportions of Portland ...


Integrating Climate Change Adaptation, Disaster Risk Reduction And Urban Planning: A Review Of Nicaraguan Policies And Regulations, Claudia Rivera, Christine Wamsler 2014 Associate Professor at Lund University Centre for Sustainability Studies (LUCSUS)

Integrating Climate Change Adaptation, Disaster Risk Reduction And Urban Planning: A Review Of Nicaraguan Policies And Regulations, Claudia Rivera, Christine Wamsler

Christine Wamsler

The integration of risk reduction and climate change adaptation has become an urgent task in addressing increasing urban risk more effectively and efficiently. This paper analyses the extent to which climate change adaptation is integrated into the policies and regulatory frameworks that guide urban risk reduction in Nicaragua, and discusses related progress. The results reveal significant progress in integrating climate change adaptation into the policy and regulatory frameworks of the three relatively new fields of (a) disaster risk reduction, (b) environmental management and (c) urban planning. They show that differences in the degree of integration relate to the development and ...


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