An investigation was made to test the method of Head on the
flow about a circular cylinder with suction. The method of Head is an
approximate method of obtaining solutions to the boundary layer equations.
The method was adapted to the digital computer to facilitate
performing the calculations, and a...
The effects of vertical ground motion are particularly significant
in the design of highway bridge girders. Conventional codes do
not recommend methods for solving the problem. The intent of this
work is to suggest an approach for such design.
A set of curves for velocity spectra which are the average...
Resistance of reinforced concrete beams to diagonal tension
was studied in a series of papers which included beams without
web reinforcement and beams with various types of web reinforcement.
The magnitude of the loading causing the formation of initial
diagonal tension cracks depended primarily on the dimensions of
the cross...
The coagulation of effluent from the kraft pulping and
papermaking process was investigated. The amount of material
coagulated from saline mixtures of the effluent is determined
as a function of time, salinity, kraft effluent
concentration, and mixture pH. Individual sources of salinity
include sea water and several different solutions of...
A study was conducted to determine the quantity and distribution
of bark debris resulting from log rafting. Three distinct problems were
studied: (I) the quantity of bark dislodged from the logs while being
placed in the rivers and during transport in log rafts; (2) the percentage
of the bark that...
A rapid expansion of population and industrialization in recent
years has created new and difficult problems in water resources
management. Prudent management of water quality will require that
more efficient methods be developed for evaluating large volumes of
data on complex river systems, and tabulating the results in a form...
This paper investigates a particular bridge construction technique
which could result in a significant torsional moment. The
structural member under consideration is a prestressed concrete
girder for which no torsional consideration is made.
Torsional shear stresses can be adequately approximated for
an I-shaped girder. Laboratory model tests were performed to...
There are several factors which affect the cost and efficiency
of a structure. The most important and basic factors are: the predominant
stress, the way the structure carries the loads and the
shape of the structure.
The structures in which the predominant stress is not bending
have been chosen to...
Oils, greases, and grit which collect on an aircraft during
flight are removed on the U. S. Air Force washracks using an
alkaline, water-base cleaner. Waste-flows from these washracks
may include in addition to free oils, emulsified oils, and alkaline,
water-base cleaners several other constituents such as acid skin
brightners,...
The treatment of waste water from a corn freezing process by
activated sludge with the aid of alum coagulation was investigated.
Both high and low energy level systems were observed with good
flocculation occurring at the low energy level. Because poor flocculation
occurs at high energy level conditions, alum was...
It is no longer possible in any area of the United States to formulate
water resources plans for single purpose projects as has been
done in past years. No longer can one of our greatest natural resources,
water, be used solely for navigation, power generation,
irrigation, or controlled for reducing...
The lower Willamette River, located between river mile 4.0
and 26.5, is the most seriously polluted section of the Willamette
River Basin.
Low dissolved oxygen concentrations of 2.0 to 3.0 mg/1 are
observed annually in this section of the river due to the pollutional
loads discharged into it. Waste discharges...
The capabilities of the coagulation-filtration process for virus
removal were evaluated by constructing and operating a one step,
2 gpm coagulation-filtration pilot plant. Multi-media filters were
used without pre-coagulation and sedimentation. A T2 bacteriophage
was used as the indicator organism. The plant was operated under
a variety of conditions in...
Storage of water for water quality control is one of the alternative
means of achieving water quality objectives. Authorities in
the field of water quality management disagree regarding the use of
precious water for the dilution of wastes.
The costs of achieving water quality objectives by treatment
of wastes at...