El Infiernillo and La Villita Dams: Seismic Behavior
El Infiernillo and La Villita rockfill dams in Southern Mexico underwent an earthquake of magnitude 7.6 (Ricter) on March 14, 1979, with epicenter about 68 mi(110 km) from each dam. As...

Activated Carbon for Treatment of Cadmium Wastewater
The use of activated carbon for heavy metal removal was exemplified by studying the adsorption characteristics of Cd(II) from Cd(II)-BF4 plating...

Factors Affecting Stress Cell Measurements in Soil
The factors affecting stress cell measurements in soil are reviewed, evaluated and synthesized in this paper. Fifteen major factors are identified, and the method for taking into account...

Adsorption Isotherm Parameter Estimation
Determination of the parameter values for the Langmuir and Freundlich adsorption isotherm equations for water and wastewater treatment samples often requires estimation of the concentration...

Seismic Response of Earth Dams in Triangular Canyons
The effects of narrow and sloping canyons on the dynamic response of embankment dams is investigated by a three-dimensional finite element analysis. Analytical results for embankments...

Temperature Effects: Methane Generation from Landfill Samples
The objective of this investigation was to study the impact of temperature variations on the rate of methane generation from solid waste. The temperatures investigated ranged from 21°C...

Improvement of Nonlinear Rainfall-Runoff Model
Water resources engineers have long been aware that the linear assumption of unit hydrograph models produces poor results in some basins. The Amorocho-Branstetter nonlinear model is an...

Composite Masonry: Research Needs
Composite masonry walls (walls built of brick and concrete masonry units bonded so as to exert common action under load) have been used for decades. Until recently, the only method of...

Loads due to Drifted Snow
Roof failures due to snow loads are often the result of heavy drifts rather than uniform snow loads. Codes and standards such as Standard A58.1 of the American National Standards Institute...

Failure of an Anchored Bulkhead
An 800-ft (240 m) long anchored bulkhead with a height of 65 ft (20 m) was designed more or less in accord with published recommendations by several acknowledged experts. Nevertheless,...

Dade County Rapid Transit: Management Scheduling Techniques
In order to reduce the size and maintenance problems of CPM schedules for large public works programs, a system of summarization networking was developed and utilized on the Dade County,...

Elastic and Particulate Media
Constitutive relations for soil are proposed which given rise to a diffusion-like equation for the normal stress component. This partial differential equation includes both particulate...

Simulation of a Buried Power Transmission System
This paper examines the simulation of the motion of three power cables (three-dimensional nonlinear beams) which are constrained to move within a pipe under thermal loads. The cables are...

Maximizing Algal Yield in High-Rate Oxidation Ponds
One of the major problems in operating high-rate oxidation ponds (HROP) so as to give the maximal yield of algae is the determination of the best combination of retention time and effluent...

Turnkey Projects for Downtown People Movers
Los Angeles, Detroit, and Miami received proposals for construction of downtown people mover systems. The requests for bids contemplated turnkey type construction contracts. The multiplicity...

Schedule Development under Stochastic Scheduling
A most effective use of Monte-Carlo schedule generation is to create a control schedule of the planning, design and construction of a major project. The normal Monte-Carlo process will...

Swell of Wyoming Montmorillonite and Sand Mixtures
Eight blends of silica sand and Wyoming montmorillonite clay (volclay) at varying proportions by weight were tested at three different temperatures (24°C, 38°C, and 66°C) to investigate...

Activated Carbon: Sorption of DOC from Wastewater
Activated carbons were prepared from a lignocellulosic material (prune pits) by pyrolysis to 900°C, and then activation in CO2 at 900°C for activation...

Sediment Transport on Gentle Slope due to Waves
A criterion for initiation of sediment movement on a gentle slope is established by balancing the forces acting on a sediment particle lying on the slope. A relationship for the instantaneous...

H-Pile Heave: A Field Test
A field test was conducted to investigate the possibility of reduction in pile capacity and the potential for excessive settlements resulting from the heave of H-piles. The piles were...

 

 

 

 

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