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Articles 601 - 630 of 1051
Full-Text Articles in Civil Engineering
A Study Of The Effects Of Mixing On The Accelerated Anaerobic Digestion Of Concentrated Municipal Sludges, Victor Darryl Orr
A Study Of The Effects Of Mixing On The Accelerated Anaerobic Digestion Of Concentrated Municipal Sludges, Victor Darryl Orr
Masters Theses
"Most domestic sewage treatment plants today practice anaerobic digestion of sludge. The purpose of this investigation was to determine if thorough mechanical mixing of concentrated sludge would improve its digestion. The simulated digesters consisted of six 1 gallon anaerobic reactors which were operated in the laboratory for 78 days. The contents of three digesters were continually mixed and their responses were compared with those of the similarly loaded remaining three unmixed units. Raw sludge with solids concentrations of 7.5, 15 and 30 per cent was digested for detention periods of 30, 15 and 7.5 days at 33º C. Various analyses …
Reservoir Design: Simulation Techniques, Larry W. Mays
Reservoir Design: Simulation Techniques, Larry W. Mays
Masters Theses
"A simulation model is developed to aid in the analysis of small dams to reduce the possibility of inadequate spillway designs. Basic assumptions concerning the geometric aspects of the natural reservoir are made to develop the model which is based upon describing the timing and magnitude of a design flood passing through a reservoir. Simulation equations are derived from the basic continuity equation and describe reservoir outflow and storage as functions of reservoir depth. Newton's Iteration Technique is utilized to solve the simulation equations for the reservoir depth. The resulting simulation model determines an optimum size auxiliary spillway having a …
Compressibility Effects On Transient Gas Pipe Flow, Gerald Francis Mouser
Compressibility Effects On Transient Gas Pipe Flow, Gerald Francis Mouser
Masters Theses
"Abstract (1) Methods of iterative solution for the partial-differential equations that govern the transient flow of gases in pipelines are obtained by using the method of characteristics and linear finite-difference techniques. Solutions are developed for 1) a constant gas compressibility factor throughout transient conditions, and 2) a variable gas compressibility factor at constant temperature dependent upon pressures encountered during transient flow. Theoretical studies are made to compare results using both approaches for pipelines operating at various constant flowing temperatures. Results show greater differences between the two methods at lower values of flowing temperature due to the more rapidly changing compressibility …
The Skid Resistance Of Asphaltic Pavements Using Glass Aggregates, Michael Vaughn Korth
The Skid Resistance Of Asphaltic Pavements Using Glass Aggregates, Michael Vaughn Korth
Masters Theses
"The disposal of the glass portion of solid waste is an ever-growing problem in the U.S. and recycling has been suggested as a possible solution. In order to find new uses for waste glass, investigations have been conducted to determine if the glass could be used as an aggregate in bituminous concrete mixtures. As part of the overall investigation, this study was concerned with investigating the skid resistance properties of the glass aggregate mixtures, called glasphalt. The objectives were to compare the skid resistance of various bituminous mixtures using aggregate combinations ranging from all glass to all conventional aggregate and …
Dynamic Behavior Of Eccentrically Stiffened Plates, Charles Stuart Ferrell
Dynamic Behavior Of Eccentrically Stiffened Plates, Charles Stuart Ferrell
Doctoral Dissertations
"The dynamic behavior of eccentrically stiffened rectangular plates is studied by the finite element method. The addition of stiffeners to a plate structure is a common method of increasing the rigidity of the structure with a minimum of weight increase. However, this stiffened plate configuration does not easily lend itself to analysis. This study is an approach to finding a rational method by which the dynamic behavior of such a stiffened plate structure may be determined. The governing differential equations for the finite element model are derived and the stiffness and mass matrices for the plate and stiffener elements are …
A Digital Computer Simulation Of A Rural Two-Lane Highway, D. Jay Frankenfield
A Digital Computer Simulation Of A Rural Two-Lane Highway, D. Jay Frankenfield
Masters Theses
"The traffic flow model developed in this study is a digital computer simulation utilizing the technique of periodic scanning to move the vehicles through a series of unit blocks. The model simulates traffic flow on a rural two-lane highway by assuming a straight and level road and incorporating sight distance restrictions and no-passing zones to simulate the effect of limited sight distance. By utilizing various "passing rules" to initiate the passing maneuver, three general topics were investigated. This study investigated the use of 1000 ADT as a criterion for yellow line striping no-passing by using the computer simulation to determine …
Contractor Quality Control: A Method Of Construction Inspection, John Scott Treadwell
Contractor Quality Control: A Method Of Construction Inspection, John Scott Treadwell
Masters Theses
"It has become apparent in recent years that the United States Government's construction contract supervision and administration procedures are causing an increase in contractor claims and disputes and that the system itself is becoming prohibitively expensive. To deal with some of these problems, the Department of Defense is attempting to implement a new approach to construction inspection--Contractor Quality control. Under the Contractor Quality Control System the majority of the standard contract inspection and testing responsibilities are placed on the contractor, and the Government relinquishes its traditional step-by-step inspection and testing procedures and withdraws to a position of contract surveillance. The …
Effects Of Flat And Elongated Particles Upon Properties Of Mixtures Containing Glass Aggregates, John Dean Doyle
Effects Of Flat And Elongated Particles Upon Properties Of Mixtures Containing Glass Aggregates, John Dean Doyle
Masters Theses
"As a possible solution for the rapidly proliferating problem of waste glass disposal in the United States, glass is being considered for use as aggregate in bituminous concrete mixtures. Crushed waste glass particles, and crushed bottle glass particles in particular, are more angular, much smoother, and contain a higher percentage of flat and/or elongated particles than conventional rock aggregate particles. Because of the differences in shape and surface texture, glass aggregate may require different gradations than those found suitable for conventional rock aggregate. Objectives of this research were to determine gradations which result in maximum density for aggregates consisting entirely, …
Digested Sludge Dewatering On Drying Beds Under Controlled Environmental Conditions, Daniel James Harris
Digested Sludge Dewatering On Drying Beds Under Controlled Environmental Conditions, Daniel James Harris
Masters Theses
"The dewatering characteristics of anaerobically digested primary and activated sludge were investigated under eight selected combinations of laboratory controlled air temperature and relative humidity using three open, drained model beds, as well as a closed, drained and an open, nondrained bed. The evaporation rate from a free water surface was also determined. Moisture content, drainage, evaporative weight loss, and sludge surface recession were measured and recorded periodically throughout the two week period of each of the eight experiments. Relationships were shown to exist between sludge moisture content, evaporation rate from a free water surface, and the parameters 6T (the difference …
Interactions Between Selected Pigment Producing Bacteria Isolated From Sewage, Leslie Alexander Lakie
Interactions Between Selected Pigment Producing Bacteria Isolated From Sewage, Leslie Alexander Lakie
Masters Theses
"Pigmented bacteria have been of interest to the microbiologist for several years. The pigmented organisms in sewage have been known to gain predominance, but no investigations have been made to determine whether the pigment assists the organism in gaining predominance. During this study a number of bacteria which produced a water soluble pigment were isolated from sewage. These bacteria were grown in shaken flasks using tryptone Glucose extract broth as a medium. Growth studies of the bacteria in pure and mixed culture were performed to determine if the pigment could affect another bacteria's growth. Studies were also performed using the …
A Statistical Hydrologic Simulation Model, Ronald L. Wycoff
A Statistical Hydrologic Simulation Model, Ronald L. Wycoff
Masters Theses
"Simulation of a physical system requires knowledge of all components of the system and their interactions. A probabilistic simulation model of a hydrologic system is developed from short term continuous, sychronized rainfall-runoff records. The individual components of the system area the time between and duration of storms, the depth of rain occurring in each time period of the storm, precipitation excess relations, and the watersheds unit hydrograph. The available data is used to define or develop the probabilistic models involved. The only nonprobabilistic model employed is the watersheds unit hydrograph. It is found that the time between and duration of …
Shear Properties Of An Organic Soil And The Same Soil With The Organic Matter Removed, David Eugene Daniels
Shear Properties Of An Organic Soil And The Same Soil With The Organic Matter Removed, David Eugene Daniels
Masters Theses
"The effect of strain rate on the shearing properties of an organic A̲ horizon Bryce clay and the same soil treated with hydrogen peroxide to remove the organic matter was studied. For both soils, the pore pressures were found to be independent of strain rate, and dependent only on the increment of strain during shear. The effect of the hydrogen peroxide treatment on the shear properties of an inorganic Bryce B̲ horizon clay was also studied. It was concluded that the hydrogen peroxide does not affect the mineral properties of the Bryce clay and serves only to selectively remove organic …
Advanced Waste Treatment Of Industrial Waste Waters By Physicochemical Processes, Michael Gay Hardie
Advanced Waste Treatment Of Industrial Waste Waters By Physicochemical Processes, Michael Gay Hardie
Masters Theses
"The primary objective of this investigation was to determine the general applicability of using physicochemical processes for treating different types of industrial wastes. Emphasis was placed on the evaluation of the treatment efficiency and the performance difficulties encountered in the treatment of each waste. Two types of waste were studied, one a high strength acidic industrial chemical waste and the other a petroleum refinery waste. The physicochemical system utilized included chemical coagulation and clarification plus activated carbon adsorption. Parallel operations of fixed-bed and expanded-bed carbon adsorbers were conducted. Treatment efficiencies were evaluated in terms of the removals of chemical oxygen …
Low Cost Housing (How To Avoid The “Problem” In Three Words Or Less), Carl P. D. Sharpe
Low Cost Housing (How To Avoid The “Problem” In Three Words Or Less), Carl P. D. Sharpe
International Symposia on Low Cost Housing Problems
No abstract provided.
Cultural Bases Of Preference For The Visual Appearance Of Residential Environments, Peter G. Flachsbart, George L. Peterson
Cultural Bases Of Preference For The Visual Appearance Of Residential Environments, Peter G. Flachsbart, George L. Peterson
International Symposia on Low Cost Housing Problems
No abstract provided.
Feasibility Of Prefabrication In Low Cost Housing, Dogan Sorguc, David Arditti, Taha Aksoy
Feasibility Of Prefabrication In Low Cost Housing, Dogan Sorguc, David Arditti, Taha Aksoy
International Symposia on Low Cost Housing Problems
No abstract provided.
A Case Study In Industrialized Housing, William L. Hooper
A Case Study In Industrialized Housing, William L. Hooper
International Symposia on Low Cost Housing Problems
No abstract provided.
Shelly-Modular Housing System, Luis E. Mora
Shelly-Modular Housing System, Luis E. Mora
International Symposia on Low Cost Housing Problems
No abstract provided.
Low Cost Housing: The Necessity Of Interdisciplinary Skills, Margaret K. Thorpe, Dwight D. Zeck
Low Cost Housing: The Necessity Of Interdisciplinary Skills, Margaret K. Thorpe, Dwight D. Zeck
International Symposia on Low Cost Housing Problems
No abstract provided.
New Towns, Leonard R. Mann
New Towns, Leonard R. Mann
International Symposia on Low Cost Housing Problems
No abstract provided.
Low Cost Housing In Europe, Sydney Lenssen
Low Cost Housing In Europe, Sydney Lenssen
International Symposia on Low Cost Housing Problems
No abstract provided.
Industrialization: Generic Examples, Specific Solutions -- Camus And Sectra, Laurence S. Cutler
Industrialization: Generic Examples, Specific Solutions -- Camus And Sectra, Laurence S. Cutler
International Symposia on Low Cost Housing Problems
No abstract provided.
Construction Methods For Low-Cost Housing, V. Malakonda Reddy, A. S. Sarma
Construction Methods For Low-Cost Housing, V. Malakonda Reddy, A. S. Sarma
International Symposia on Low Cost Housing Problems
No abstract provided.
Soil Cement Blocks For Low Cost Housing -- Correlation Of Experimental Results With Site Observations, P. Selvanayagam
Soil Cement Blocks For Low Cost Housing -- Correlation Of Experimental Results With Site Observations, P. Selvanayagam
International Symposia on Low Cost Housing Problems
No abstract provided.
Aggregate Rendered Plywood Or Asbestor Exterior Wall Panels For Domestic Structures, A. Coull, R. T. Mccrone
Aggregate Rendered Plywood Or Asbestor Exterior Wall Panels For Domestic Structures, A. Coull, R. T. Mccrone
International Symposia on Low Cost Housing Problems
No abstract provided.
A Hyper-Roof Concept For Low-Cost Housing, John V. Huddleston
A Hyper-Roof Concept For Low-Cost Housing, John V. Huddleston
International Symposia on Low Cost Housing Problems
No abstract provided.
Low Cost Housing In The Perspective Of Metropolitan Calcutta’S Urban Renewal, S. Ghosh Dastidar
Low Cost Housing In The Perspective Of Metropolitan Calcutta’S Urban Renewal, S. Ghosh Dastidar
International Symposia on Low Cost Housing Problems
No abstract provided.
An Experiment In Low Cost Housing In Stillwater, Oklahoma, William H. J. Cleverly, Phillip G. Manke
An Experiment In Low Cost Housing In Stillwater, Oklahoma, William H. J. Cleverly, Phillip G. Manke
International Symposia on Low Cost Housing Problems
No abstract provided.
Concrete Sandwich Panels For Low Cost Housing Construction, Robert W. Ellis Jr., Steven D. Cummings
Concrete Sandwich Panels For Low Cost Housing Construction, Robert W. Ellis Jr., Steven D. Cummings
International Symposia on Low Cost Housing Problems
No abstract provided.
Acoustic Evaluation Of The Ten Houses In The Austin Oaks Project, Elmer L. Hixson
Acoustic Evaluation Of The Ten Houses In The Austin Oaks Project, Elmer L. Hixson
International Symposia on Low Cost Housing Problems
No abstract provided.