A computer program called SAPWOOD which possesses the
capability of performing linear or nonlinear, static or
dynamic response including seismic excitation for wood-framed
buildings with semirigid connection systems is
presented in this study. Program SAPWOOD is a modification
of the program NONSAP by adding new elements such as a
linkage...
A Langmuir sorption model incorporating a second step of
irreversible absorption was applied to a model soil system. The column
was packed with cellulose triacetate; pulse and step input tests with
3,4-dichlorophenol were performed; the effluent concentration was
measured by electron capture detector gas chromatography and sorption
rate constants were...
With current nonlinear analysis computer capabilities, this
study was conducted to develop a linkage element that permits
analyses of wood composite structures taking into account possible
slip in the nailed joints. The finite elements chosen to represent the wood stud, plywood, gypsum and nails are described. The
method as applied...
The biodegradation of five polychlorinated biphenyls (PCBs) by
Hudson River and Silver Lake sediments was studied using gas
chromatography with electron capture detection (GC/ECD) and gas
chromatography with mass spectrometry (GC/MS) analyses. Methanogenic
sediments from the Hudson River and Silver Lake were used to inoculate
four anaerobic filter reactors. The...
Mathematical models of the precipitation process are needed to
effectively use historical precipitation data in the design and
planning of engineering projects and for analysis of watershed
runoff behavior. Existing simple models based on the assumptions of
independent, identically-distributed random variables are
insufficient to describe several features of the historical...
Chromium, an element of widespread use, is toxic in some
forms. Improper disposal of waste chromium products has
resulted in contamination of many sites throughout the United
States, including the United Chrome Products Superfund site
in Corvallis, Oregon. A better understanding of chromium
chemistry is needed to facilitate the remediation...
Several dichotomous-response models of carcinogenesis are discussed and their implications for low-dose risk estimation are
examined. In addition, a pharmacokinetic model incorporating non-linear kinetics is studied and the results are investigated with
respect to multiple-pollutant exposures. None of these models appears to suggest the existence of "thresholds".
The analysis of...
Research was conducted to determine the applicability of using the theory of
regionalized variables or geostatistics in characterizing the spatial variability of reference
evapotranspiration (ETr) over various climatic regimes for the state of Oregon. The state was
divided into five climatic regions based on topographic features and local meteorological
conditions:...
Regionalized variable analysis has been used to study
a number of meteorological and hydrological variables
including precipitation (Delhomme and Delfinier, 1973),
streamfiow (Villeneuve et al., 1979) and hydraulics of
groundwater aquifers (Gambolati and Volpi, 1979). In the
research work reported in this thesis, an attempt was
made to characterize the...
Hydrazine based fuels are used by the Air Force for the Titan II
and Minuteman III missiles and the F-16 aircraft and by the National
Aeronautics and Space Administration for propulsion systems and the
Space Shuttle Program. These uses represent significant production,
transportation and storage of these fuels, and, as...
Research was conducted to study the behavior and
load carrying capacity of stump anchors. A field testing
program was undertaken to determine the response and
strength characteristics of second growth Douglas-fir
(Pseudotsuga menziesii) stumps ranging in diameter from
6 to 17 inches. Horizontal and vertical stump movements
due to an...
This study includes an analytical solution to the wave-current
barrier interaction problem and large scale experiments to validate the
theory.
The boundary value problem is solved mathematically by characterizing
the flow field and barrier motion separately, then coupling
the relationships with the appropriate kinematic and dynamic boundary
conditions.
The flow...
The nonlinear dynamic analysis of cable and cable-large
body systems subject to both deterministic and non-deterministic
loading is presented in this study. Nonlinearities
occur due to large displacements, material nonlinearity,
lack of stiffness in compression, and the non-conservative
fluid loading.
A finite element model is used to model the cable...
This dissertation presents the findings of a literature review and information
regarding selection, implementation and development of a chemical composition
procedure for asphalt cements. The chemical composition analysis selected was
the Corbett-Swarbrick procedure standarized as ASTM D4124. The procedure is
a selective adsorption / desorption (solid / liquid) chromatography which...
Chromium spills on soils are causing severe groundwater contamination
problems. To increase the performance of cleanup methods, the chemical behavior
of chromium in soils and its transport through soils have to be understood. The
objectives of this research were to investigate the sorption characteristics of
chromium(VI) in soil and to...
Many of the analytical techniques that are currently available are not capable of
analyzing the offtracking of truck and trailer combinations or the path of load overhangs
through a set of curves that are commonly found on forest roads. Advances in the
processing speed of microcomputers have made it possible...
A three dimensional finite element analysis is developed which
is capable of simulating the coupled static and dynamic behavior of
compliant ocean structures. Nonlinearities which result from large-deflection,
reduced or zero stiffness in compression, and the nonconservative
fluid loading are considered. The spatial variation of
fluid loading is also addressed....
Deposition of the Middle Devonian part of the Denay Limestone
and Bay State Dolomite in the northern Antelope Range and Fish
Creek Range, respectively, took place on and in front of a carbonate
platform with a lime sand shoal at the shelf edge. In the Givetian part
of the Denay...