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Articles 1591 - 1620 of 2167
Full-Text Articles in Civil and Environmental Engineering
Thermal Effectiveness Characteristics Of Low Approach Indirect Evaporative Cooling Systems In Buildings, Ben Costelloe, Donal Finn
Thermal Effectiveness Characteristics Of Low Approach Indirect Evaporative Cooling Systems In Buildings, Ben Costelloe, Donal Finn
Articles
Meteorological enthalpy analysis of temperate and maritime climates above latitude 45°N suggests that the water-side evaporative cooling technique has considerable unrealised potential with contemporary “high temperature” building cooling systems—such as chilled ceilings and displacement ventilation. As low approach conditions are the key to exploiting the cooling potential of the ambient air, thermal performance at such conditions needs to be investigated. To address the research issues, an industrial scale test rig, based on a low approach open cooling tower and plate heat exchanger and designed to maximise evaporative cooling potential, has been constructed. The thermal effectiveness of such systems (as a …
Nondestructive Evaluation Of Rc Structures Strengthened With Frp Laminates Containing Near-Surface Defects In The Form Of Delaminations, Mahmut Ekenel, John J. Myers
Nondestructive Evaluation Of Rc Structures Strengthened With Frp Laminates Containing Near-Surface Defects In The Form Of Delaminations, Mahmut Ekenel, John J. Myers
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Fiber reinforced polymer (FRP) composites are being utilized in a wide range of application areas in structural rehabilitations because these materials are less affected by corrosive environmental conditions and known to provide longer life with less maintenance. However, there are still some concerns about FRP strengthened reinforced concrete (RC) structures, such as the presence of near-surface defects. Currently limited data exists regarding this issue. the presence of near-surface defects in the form of delaminations between the fiber reinforced polymer (FRP) laminate and concrete substrate can significantly affect the structural integrity and stiffness of the structural section. These defects should be …
Quantification Of Steroid Sex Hormones Using Solid-Phase Extraction Followed By Liquid Chromatography-Mass Spectrometry, Youssef Filali-Meknassi, Muriel Auriol, Craig D. Adams, Rao Y. Surampalli
Quantification Of Steroid Sex Hormones Using Solid-Phase Extraction Followed By Liquid Chromatography-Mass Spectrometry, Youssef Filali-Meknassi, Muriel Auriol, Craig D. Adams, Rao Y. Surampalli
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
In this study, the occurrence of trace amounts of natural and synthetic steroid estrogens in the aquatic environment was studied using liquid chromatography coupled with electrospray mass spectrometry, following solid-phase extraction (SPE). the SPE was performed with C18 and NH2 cartridges. the first objective was to develop a reliable method for analyzing steroid estrogens (resulting from human and animal excretions) in different matrices. the method developed was then applied to quantify the occurrence of natural and synthetic hormones (estrone [E1], 17β-estradiol [βE2], 17α-estradiol [αE2], estriol [E3], and 17α-ethinylestradiol [EE2]) in environmental samples in surface water and wastewater treatment plant (WWTP) …
Dynamic And Economic Design Of Rigid Retaining Wall, Y. Wu, Shamsher Prakash, V. K. Puri
Dynamic And Economic Design Of Rigid Retaining Wall, Y. Wu, Shamsher Prakash, V. K. Puri
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
A 2-D model which accounts for the effect of coupled sliding and rocking motion and uses strain dependent soil stiffness and material damping for calculating the response of rigid retaining walls subjected to dynamic loads, was developed earlier. This model was used to study the effect inclination of the wall face in contact with the backfill, on its displacement under the effect of ground motions due to Northridge, ElCentro and Loma Prieta earthquakes. the effect of wall inclination on cumulative displacements is discussed and its role in achieving possible cost effectiveness in design of rigid retaining wall is highlighted. Copyright …
Collapse Assessment Of Degrading Mdof Structures Under Seismic Excitations, Mouchir Chenouda, Ashraf Salah Eldin Ayoub
Collapse Assessment Of Degrading Mdof Structures Under Seismic Excitations, Mouchir Chenouda, Ashraf Salah Eldin Ayoub
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Seismic code provisions are now adopting performance-Based methodologies, where structures are designed to satisfy multiple performance objectives. Most codes rely on approximate methods to predict the desired seismic demand parameters. Most of these methods are based on simple SDOF models, and do not take into account neither MDOF nor degradation effects, which are major factors influencing structural behavior under earthquake excitations. More importantly, most of these models can not predict collapse explicitly under severe seismic loads. This study presents a newly developed model that incorporates degradation effects into seismic analysis of MDOF structures. a new energy-Based approach is used to …
Design Of Concrete Railing Reinforced With Glass Fiber Reinforced Polymer Bars, Fabio Matta, Antonio Nanni
Design Of Concrete Railing Reinforced With Glass Fiber Reinforced Polymer Bars, Fabio Matta, Antonio Nanni
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The use of Fiber Reinforced Polymer (FRP) reinforcement is a practical alternative to conventional steel rebars in concrete structures subjected to aggressive environments. the solution is attractive for bridge deck and rail applications, as it eliminates corrosion of the steel reinforcement, which is the major instrument of degradation. Due to the peculiar physical and mechanical characteristics of advanced composite materials, the design philosophy of FRP reinforced concrete (RC) structures differs from that of traditional RC. This paper introduces a systematic approach adopted for the structural and functional design of an open-post bridge railing reinforced with Glass FRP bars (GFRP) as …
Softened Truss Model For Rc Torsional Members Under Combined Action, Gary Greene, Abdeldjelil Belarbi
Softened Truss Model For Rc Torsional Members Under Combined Action, Gary Greene, Abdeldjelil Belarbi
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
No abstract provided.
Remote Health Monitoring Of The First Smart Bridge In Florida, Ebrahim Mehrani, Ashraf Salah Eldin Ayoub
Remote Health Monitoring Of The First Smart Bridge In Florida, Ebrahim Mehrani, Ashraf Salah Eldin Ayoub
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Monitoring of civil engineering structures is a new area that has gained significant attention recently and became a topic of extreme national interest. This area is being driven by the need to develop efficient condition assessment procedures for structural performance in response to societal and economic needs. the main goal of monitoring is to detect accurately and efficiently structural damage either due to long-term deterioration processes or due to extreme events (e.g. earthquakes, blasts). with the emergence of new technologies, structures can now be monitored remotely from a central monitoring station located several miles away from the field. Sensors are …
Lagrangian Mixing In Decaying Stably Stratified Turbulence, Subhas K. Venayagamoorthy, Derek D. Stretch
Lagrangian Mixing In Decaying Stably Stratified Turbulence, Subhas K. Venayagamoorthy, Derek D. Stretch
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Direct numerical simulations are used to study mixing and dispersion in decaying stably stratified turbulence from a Lagrangian perspective. The change in density of fluid particles owing to small-scale mixing is extracted from the simulations to provide insight into the mixing process. These changes are driven by temporally and spatially intermittent events that are strongly suppressed as the stratification increases and overturning motions disappear. This occurs for times Nt > 2π i.e. after one buoyancy period, where N is the buoyancy frequency. The role of small-scale mixing processes in the density (or buoyancy) flux is analyzed. After an initial transient, we …
Design Of Window Glass For Lateral Pressures, Joseph E. Minor, H. Scott Norville
Design Of Window Glass For Lateral Pressures, Joseph E. Minor, H. Scott Norville
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
ASTM Standard E 1300-04 ("Standard practice for determining load resistance of glass in buildings") outlines procedures for determining the strength of window glass products when the glass is subjected to uniform lateral pressure. This standard practice addresses each of the commonly used window glass products (monolithic glass, laminated glass, and insulating glass) that are fabricated from annealed, heat strengthened, and fully tempered glass plates, used singly or in combination. the procedures are based on principles of structural mechanics, are thorough, and are presented in clear and concise terms. Analyses of the basis for and the scope of these procedures lead …
Mansfield Ct: Planning A New Village Center, Maggie Jones, Richard Barringer
Mansfield Ct: Planning A New Village Center, Maggie Jones, Richard Barringer
Planning
The case follows the development of a plan for a new village center in Storrs, the central village of Mansfield, Connecticut. A process that was transparent and inclusive of the community members yielded a plan that gained the approval of the Town, the landowner (the University of Connecticut), and the citizenry. The process relied on the mending of fences, the leadership of key participants, and an innovative strategy that included development of a nonprofit corporation and creative use of grant money. While zoning changes are still in the works, the first stage of building goes forward.
South Kingstown Ri: New Zoning For An Historic Mill, Maggie Jones, Richard Barringer
South Kingstown Ri: New Zoning For An Historic Mill, Maggie Jones, Richard Barringer
Planning
The village of Peace Dale in the town of South Kingstown, Rhode Island, developed around several mills that commenced operations in the 1800s. One mill, known as the Palisades, is still partially active and in excellent condition, but much of its square footage is unutilized. A citizens’ group of artists and business people joined with the mill owners and the town of South Kingstown to develop new zoning regulations to make more flexible the permitted uses for the mill site. The proposed zoning will allow the mill complex to feature a mix of retail, residential, and manufacturing uses, while preserving …
Augusta Me: The New Bridge Begets A New Planned Neighborhood, Molly Pulsifer, Richard Barringer
Augusta Me: The New Bridge Begets A New Planned Neighborhood, Molly Pulsifer, Richard Barringer
Planning
Construction of a new Third Bridge over the Kennebec River in Augusta offered the prospect of a new and handsome gateway to the city. Further, the resulting change in traffic patterns offered the City the chance to plan for a pattern of development quite different from what the city had experienced for the past half-century. The case study describes the planning and construction of the new bridge and corridors that re-routed traffic out of Augusta’s downtown and older neighborhoods, and created the opportunity for planned development adjacent to the corridor created by the new bridge. It goes on to describe …
Changing Maine, 1960-2010: Teaching Guide, Richard Barringer, New England Environmental Finance Center
Changing Maine, 1960-2010: Teaching Guide, Richard Barringer, New England Environmental Finance Center
Maine History & Policy Development
Unlike forty years ago, none of us is now certain what the future holds for Maine – except that it will be different. Maine has been transformed by the events of the recent decades. We have come into a new world, a new time – a new historical era, if you will. This new era, like previous eras in Maine history, will require of us new ways of thinking, new ways of understanding, new ways of organizing ourselves as a community of people, if the values and culture we share and cherish are to endure and flourish.
Trees And Ice Storms: The Development Of Ice Storm–Resistant Urban Tree Populations (Second Edition), Richard J. Hauer, Jeffrey O. Dawson, Les P. Werner
Trees And Ice Storms: The Development Of Ice Storm–Resistant Urban Tree Populations (Second Edition), Richard J. Hauer, Jeffrey O. Dawson, Les P. Werner
United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications
Severe ice storms occur every year in the United States and Canada, particularly in the midwestern and eastern regions of the United States. Along with fires and wind, ice storms are a frequent and major natural disturbance factor in eastern deciduous forests. Likewise ice storms are responsible for deaths and injuries of people and cause dramatic damage and tree loss to urban forests. Ice storms annually result in millions of dollars in loss, and potentially billions of dollars in losses for extreme and widespread ice storms. Damage to electric distribution systems, blocked roadways, and property damage from fallen trees and …
Effect Of Seeding Materials And Mixing Strength On Struvite Precipitation, Jun Wang, Joel Gerard Burken, Xiaoqi Zhang
Effect Of Seeding Materials And Mixing Strength On Struvite Precipitation, Jun Wang, Joel Gerard Burken, Xiaoqi Zhang
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Struvite Precipitation Has Increasing Interest as a Technology for Removing and Recovering Phosphorus from Wastewater Streams. Many Chemical Factors Have Been Studied, Such as Optimum PH Values and Component-Ion Molar Ratios, Yet, Understanding of Physical Aspects is Lacking. Two Physical Parameters Were Tested: (1) Seeding Material Addition and (2) Mixing. Objectives Were to Evaluate Three Seeding Materials and to Optimize Mixing Conditions for Struvite-Crystal Precipitation, Growth, and Subsequent Sedimentation. Results Confirm that Mixing Strength and Proper Seeding Materials Increase Crystal Size and Improve Settleability. for Unseeded Solutions, Optimum Phosphorus Removal Was Achieved at a Mixing Strength of G = 76 …
Numerical Simulations Of The Interaction Of Internal Waves With A Shelf Break, S. K. Venayagamoorthy, O. B. Fringer
Numerical Simulations Of The Interaction Of Internal Waves With A Shelf Break, S. K. Venayagamoorthy, O. B. Fringer
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The energetics of the interaction of internal gravity waves with a shelf break is investigated by means of high-resolution two-dimensional numerical simulations, with an emphasis on understanding the partitioning of the internal wave energy over the course of the interaction process and the subsequent dynamics of the onshore propagating internal waves. Some of the energy is dissipated as a result of the instabilities associated with breaking, while the remaining energy is either reflected back away from or transmitted onto the shelf. We employ an analysis of the distribution of the energy flux across the shelf break taking into account the …
Cost-Effective, Structural Stay-In-Place Formwork System Of Fiber-Reinforced Polymer For Accelerated And Durable Bridge Deck Construction, Thomas E. Ringelstetter, Lawrence C. Bank, Michael G. Oliva, Jeffrey S. Russell, Fabio Matta, Antonio Nanni
Cost-Effective, Structural Stay-In-Place Formwork System Of Fiber-Reinforced Polymer For Accelerated And Durable Bridge Deck Construction, Thomas E. Ringelstetter, Lawrence C. Bank, Michael G. Oliva, Jeffrey S. Russell, Fabio Matta, Antonio Nanni
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This paper describes research on the evolution of a cost-effective, structural stay-in-place (SIP) formwork bridge deck system with an integrated modular three-dimensional fiber-reinforced polymer (FRF) reinforcement cage. Recent research conducted at the University of Wisconsin is reviewed to show the evolution of the reinforcing system to include an integral FRP SIP form. the evolution occurred through laboratory testing, which was followed by the design and construction of two bridge structures owned by the State of Wisconsin. Each structure used different FRP reinforcement and formwork. These projects pointed out the need for a competitive SIP formwork to be used in conjunction …