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Articles 1801 - 1830 of 2166

Full-Text Articles in Civil and Environmental Engineering

The Structural Behavior Of Homogeneous And Hybrid Stub Columns Under Dynamic Loading Conditions, Chi Ling Pan, Wei Wen Yu Jan 1998

The Structural Behavior Of Homogeneous And Hybrid Stub Columns Under Dynamic Loading Conditions, Chi Ling Pan, Wei Wen Yu

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

It has been recognized that the mechanical properties of sheet steels and the structural strength of cold-formed steel members can be influenced by strain rate. For studying the local and postbuckling behavior of the stiffened and unstiffened compression elements under dynamic loading condition, 97 stub columns which were assembled from the same material have been tested under different strain rates. In order to study the structural behavior of hybrid cold-formed stub columns, a total of 144 specimens were investigated. In addition, 52 drop silo tests of stub columns were conducted at General Motors Corporation (GM). The results showed that the …


Gaseous Cah Removal By Biofiltration In Presence And Absence Of A Nonionic Surfactant, J. O. Kim, Purush K. Terkonda, S. D. Lee Jan 1998

Gaseous Cah Removal By Biofiltration In Presence And Absence Of A Nonionic Surfactant, J. O. Kim, Purush K. Terkonda, S. D. Lee

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The objectives of this study were to investigate the biodegradation of gaseous trichloroethylene (TCE) and tetrachloroethylene (PCE) in an activated carbon biofilter inoculated with phenol-oxidizing microorganisms and to study the effect of surfactant concentration below its critical micelle concentration (CMC) on the removal efficiency of TCE or PCE. For the enhanced biofiltration, a biodegradable nonionic surfactant was added to biofilters. The investigation was conducted using two specially built stainless steel biofilters, one for TCE and the other for PCE. The removal efficiency of gaseous TCE was 100% at a residence time of 7 min and its average inlet concentration of …


Bs News Jan 1998

Bs News

Building Services Engineering

No abstract provided.


Bs News Dec 1997

Bs News

Building Services Engineering

No abstract provided.


Maine Guide To Energy Efficient Residential Construction : A Manual Of Accepted Practices, State Of Maine Energy Conservation Division Nov 1997

Maine Guide To Energy Efficient Residential Construction : A Manual Of Accepted Practices, State Of Maine Energy Conservation Division

Maine Collection

Maine Guide to Energy Efficient Residential Construction : A Manual of Accepted Practices

State of Maine Energy Conservation Division, Department of Economic and Community Development, 59 State House Station, Augusta, Maine 04333-0059

Second Edition - November, 1997

Contents: Dedication / Acknowledgements / Introduction / Part 1. Summary of Maine's Residential Energy Standards / Part 2. Siting and Initial Design Considerations / Part 3. Important Considerations for the Design Phase / Part 4. Recommended Construction Practices / Appendixes


Bs News Oct 1997

Bs News

Building Services Engineering

No abstract provided.


Bs News Sep 1997

Bs News

Building Services Engineering

No abstract provided.


Bs News Jul 1997

Bs News

Building Services Engineering

No abstract provided.


Bs News Jun 1997

Bs News

Building Services Engineering

No abstract provided.


Uptake And Metabolism Of Atrazine By Poplar Trees, Joel Gerard Burken, Jerald L. Schnoor May 1997

Uptake And Metabolism Of Atrazine By Poplar Trees, Joel Gerard Burken, Jerald L. Schnoor

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Hybrid Poplar Trees Can Uptake, Hydrolyze, and Dealkylate Atrazine to Less Toxic Metabolites. in Whole Plant Studies, the Parent Compound Atrazine and 14C Ring-Labeled Metabolites Were Extracted from Poplar Tissues and Analyzed Via High-Pressure Liquid Chromatography (HPLC) with UV and Radiochromatographic Detectors in Series. the Concurrent Separation and Identification of These Metabolites Has Not Been Previously Reported in Higher Plants for Phytoremediation Applications. Unidentified Metabolites Were Also Detected. Metabolism of Atrazine Occurred in Poplar Roots, Stems, and Leaves and Became More Complete with Increased Residence Time in Tissues. in Poplar Cuttings Exposed to Atrazine for 50 Days, the Parent Compound …


Bs News May 1997

Bs News

Building Services Engineering

No abstract provided.


Bs News Apr 1997

Bs News

Building Services Engineering

No abstract provided.


Bs News Mar 1997

Bs News

Building Services Engineering

No abstract provided.


Bs News Feb 1997

Bs News

Building Services Engineering

No abstract provided.


University Of Missouri-Rolla Research On Cold-Formed Steel Structures, Wei Wen Yu, Roger A. Laboube Jan 1997

University Of Missouri-Rolla Research On Cold-Formed Steel Structures, Wei Wen Yu, Roger A. Laboube

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

During the past 27 years, numerous research projects have been conducted at the University of Missouri-Rolla (UMR) under the sponsorships of the American Iron and Steel Institute, National Science Foundation, American Society of Civil Engineers, Metal Building Manufacturers Association, Steel Deck Institute, Metal/Lath Steel Framing Association, Chromium Center, Nickel Development Institute, and several steel companies located in the USA, Canada, and South Africa. The purpose of these investigations has been to study the structural strength of cold-formed steel members, connections, and structural systems. Some of the research findings have been used in the development of the AISI Specification for the …


Cold-Formed Steel Webs With Openings: Summary Report, Roger A. Laboube, Wei-Wen Yu, J. E. Langan, M. Y. Shan Jan 1997

Cold-Formed Steel Webs With Openings: Summary Report, Roger A. Laboube, Wei-Wen Yu, J. E. Langan, M. Y. Shan

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Based on a 3-year study that focused on the behavior of cold-formed steel beams with web openings, researchers at the University of Missouri-Rolla have developed simple, easy to apply design recommendations. The design recommendations address the limit states of web buckling resulting from bending, shear, web crippling, combined bending and shear, and combined bending and web crippling. The recommendations were developed based on the results of experimental and analytical studies of C-section beams. The C-sections, which are commonly used for wall studs and floor joists, are manufactured with web openings. Common web opening sizes are 38 x 102mm and 19 …


Carbon Frp Strengthening Of Doubly Curved Precast Pc Shell, M. Barboni, A. Benedetti, Antonio Nanni Jan 1997

Carbon Frp Strengthening Of Doubly Curved Precast Pc Shell, M. Barboni, A. Benedetti, Antonio Nanni

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In this paper a recent rehabilitation project completed in Italy using carbon fiber reinforced plastic (CFRP) unidirectional sheets is examined. This technology was selected for the strengthening of a doubly curved, precast, prestressed concrete (PC) shell. The shell was part of the roof of an industrial building and had experienced severe localized damage due to accidental heat radiating from a flue. The selection of the CFRP system involved the screening of different repair procedures with relation to the constraints imposed by the owner: limited disturbance to the industrial process, safety of the occupants, low cost, and durability. In addition, the …


Performance-Based Testing Of Chemical Stabilizers, Thomas M. Petry Jan 1997

Performance-Based Testing Of Chemical Stabilizers, Thomas M. Petry

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Chemical stabilizing agents have been introduced that have performed in field applications to improve the behavior of earth materials. The same agents and materials subjected to standardized laboratory tests have often resulted in no improvement. For example, the tests often require pulverization of materials to finer states than are needed in the field or may require remolding when field applications are done in situ, as with injection applications. Some of the physical tests do not place treated materials in a situation resembling conditions in the field, yet they are applied to determine the use of these agents. The experiences of …


Multiobjective Optimization Design With Pareto Genetic Algorithm, Franklin Y. Cheng, Dan Li Jan 1997

Multiobjective Optimization Design With Pareto Genetic Algorithm, Franklin Y. Cheng, Dan Li

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This paper presents a constrained multiobjective (multicriterion, vector) optimization methodology by integrating a Pareto genetic algorithm (GA) and a fuzzy penalty function method. A Pareto GA generates a Pareto optimal subset from which a robust and compromise design can be selected. This Pareto GA consists of five basic operators: reproduction, crossover, mutation, niche, and the Pareto-set filter. The niche and the Paretoset filter are defined, and fitness for a multiobjective optimization problem is constructed. A fuzzy-logic penalty function method is developed with a combination of deterministic, probabilistic, and vague environments that are consistent with GA operation theory based on randomness …


Bs News Jan 1997

Bs News

Building Services Engineering

No abstract provided.


Bs News Oct 1996

Bs News

Building Services Engineering

No abstract provided.


Bs News Sep 1996

Bs News

Building Services Engineering

No abstract provided.


Bs News Jul 1996

Bs News

Building Services Engineering

No abstract provided.


Bs News Jun 1996

Bs News

Building Services Engineering

No abstract provided.


Bs News May 1996

Bs News

Building Services Engineering

No abstract provided.


Bs News Apr 1996

Bs News

Building Services Engineering

No abstract provided.


Bs News Mar 1996

Bs News

Building Services Engineering

No abstract provided.


Nonlinear Lateral Pile Deflection Prediction In Sands, Shamsher Prakash, Sanjeev Kumar Feb 1996

Nonlinear Lateral Pile Deflection Prediction In Sands, Shamsher Prakash, Sanjeev Kumar

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

A method has been developed to predict the load-displacement relationship for single piles subjected to lateral load, embedded in sands, considering soil nonlinearity using subgrade reaction. This is the first systematic study to develop lateral load-deflection curves using modulus degradation with strain. Based on the analysis of 14 full-scale lateral pile-load tests, an empirical equation of modulus degradation with strain and a range of k hmax values, i.e., k h at 0.002 strain at 1 m (3.28 ft) depth, has also been proposed. An example problem is included to demonstrate its use. Based on this method, the computed load deflections …


Bs News Feb 1996

Bs News

Building Services Engineering

No abstract provided.


Multiobjective Optimization Of Structures With And Without Control, Franklin Y. Cheng, Dan Li Jan 1996

Multiobjective Optimization Of Structures With And Without Control, Franklin Y. Cheng, Dan Li

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

A multiobjective optimization algorithm is introduced, and the effect of different objective functions on structural design is investigated. The basic idea of this approach is to support the decisionmaker by directly selecting the best compromise solution from the Pareto optimal solutions. A payoff matrix is first constructed by optimizing each objective function subject to the given constraints; a substitute function is then formed. Under the original constraint conditions, maximizing the substitute function gives the best compromise solution. This research shows that multiobjective optimization should be carried out to obtain a rational structural design. Two structural optimal design examples - one …