Performance of Modified Chlorine Contact Chamber
A field study on the effectiveness of perforated baffles in an existing cross-baffled serpentine flow chlorine contact chamber is reported. The object of the method studied was to increase...

Nitrification Kinetics and Its RBC Application
The surface reaction model for the mechanism of mass transfer-metabolism in the fixed-film nitrification process is investigated and discussed for the design of trickling filter systems...

Managing Potomac Water Quality: Evolving Approaches
While an ambitious point source control program has yielded measurable improvements in water quality of the Upper Potomac River Estuary, the degree to which additionally strict point source...

Design Approach to Dual-Power Aerated Lagoons
Completely- and partially-suspended lagoon cells are defined and their use in dual-power level, multicellular systems is discussed. A procedure is presented for the design of such systems...

Rotating Biological Contactor System Design
Practical application of Wu's model for the prediction of soluble BOD removal in RBC systems is discussed extensively for various operating conditions. The model was tested by the use...

Body Wave Excitations of Embedded Hemisphere
Solutions of three-dimensional vibrations of an embedded hemispherical foundation are presented for excitation by incident plane P, SV, and SH waves with arbitrary angles of incidence....

Probabilistic Model of Progressive Failure of Slopes
A probabilistic model for the progression of failure in a soil slope is presented. Failure progression is defined as a spatial and continuous extension of the failure zone along a potential...

Concepts and Instruments for Improved Monitoring
It is shown that a good instrumentation strategy, based on reliable measurements of displacements and pressures, is necessary for monitoring the safety and the behavior of civil works...

Ko - OCR Relationships in Soil
The relationships between Ko and OCR are investigated for primary loading - unloading - reloading conditions. The study reviews laboratory data from...

Thermal Plume Area Calculation
A simple formula for the surface area of a thermal plume is proposed, appropriate for application to a depth-limited surface discharge. The formula is based upon thermodynamic and kinematic...

The V-Shaped Broad-Crested Weir
A discharge measurement structure with a triangular control section and a broad crest provides a rather wide measuring range while the head-discharge relation remains unaffected by tailwater...

Behavior and Design of Reinforced and Composite Concrete Structures
The force-deformation equilibrium equations of reinforced and composite concrete columns are formulated, from which moment-curvature-thrust relationships are developed. The cross section...

Seismic Hazard Analysis of Lifelines
Methods for assessing the seismic safety of a lifeline system are developed; with part of the study being devoted to the development of a relation between the earthquake intensity and...

Seismic Response of Friction Damped Braced Frames
A new concept of aseismic design for steel framed buildings is proposed. By providing sliding friction devices in the bracing system of the framed buildings, their earthquake resistance...

Reinforced Gypsum for Egyptian Housing
Reinforcement of gypsum for wall and roof panels is investigated using Egyptian gypsum combined with fibers and Nile reeds. Panels reinforced with jute, glass wool, wire, polypropylene...

Slow Crack Growth in Cement Composites
The resistance to crack growth in mortar, concrete and fiber reinforced concrete was studied by testing double torsion and double cantilever speciments. R-curves (plots of strain energy...

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...

Bayesian Persistence Analysis for Wind Energy
The persistence of wind speed is an important consideration in the assessment of a wind enery conversion site. Since data are often limited at such a site, a practical Bayesian formulation...

Civil Engineering Planning Guide: Part II — Transportation Planning
The urban transportation planning process has changed dramatically during the past 25 years. This paper describes the important characteristics of such a planning process, including the...

A Shear Lag Anomaly
This technical note reports an interesting phenomenon associated with shear lag in the flanges of box girders that is quite contrary to well established ideas concerning this subject....

 

 

 

 

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