For the purpose of investigating the fundamental nature of the
interannual oscillation observed in the tropical Pacific in conjunction with
El Nino/Southern Oscillation (ENSO), the Comprehensive Ocean
Atmosphere Data Set was analyzed. Based upon this analysis, an
"intermediate" tropical atmosphere-ocean coupled model was developed.
For reason of their particular importance...
The chopper-stabilized operational amplifier has good low
frequency noise properties. Unfortunately a simple technique for
simulation of the chopper-stabilized operational amplifier has
not been available.
This thesis describes the implementation of a differential
amplifier using chopper stabilization and its circuit modeling
for the SPICE simulation. This circuit has been designed...
Evidence exists that links a sedentary lifestyle with the emergence of chronic
diseases during adulthood. Reports indicate that many children and adolescents already
have risk factors for chronic diseases and the prevalence of obesity among children is at
an all time high. There are concerns that children may not be...
A study of stress transfer near the ends of the whisker in a simulated whisker reinforced composite material was conducted by using
photoelastic techniques. The composite material studied was
αAl₂O₃ whiskers in an aluminum matrix. The photoelastic models
used consisted of a scaled-up macroscopic stiffener embedded in a
three-dimensional epoxy...
Deterministic source signature deconvolution is applied to the
processing of marine wide angle and vertical profiler data with air-gun
sources. Optimum results are obtained with a source signature
measured by stacking the signal reflected from a relatively homogeneous
abyssal plain sedimentary environment. This eliminates the need for
the unstable inverse...
The merits of the photoelastic coating technique as applied to
wood were evaluated. Comparative tests were made on 12 nominal
two-by-four Douglas Fir boards. The object of these tests was to
determine the limitations of this technique, such as accuracy and
complexity of experimental procedure. Correlation of the experimental
results...
A time-dependent, spectral, barotropic model and a similar
two-layer primitive equation model are developed to investigate the
planetary-scale wave responses to various types of large-scale
forcing: vorticity and heat sources, and sea surface temperature (SST)
anomalies. Both models are linearized about the zonal mean states of
January climatology.
The characteristics...
The determination of failure is complicated when a structural
element is subjected to combined rather than simple stresses. This
is especially true when the principle of superposition does not apply.
For such cases, tests of the element under the expected loads are
required to determine its failure criteria.
In this...
Our nation's schools are in a key position to promote regular physical activity
through participation in quality physical education programs (Sallis & McKenzie,
1991). The ultimate long-term demonstration of each program's impact is the
students' maintenance of an active lifestyle. Physical educators are consistently
attempting to find different ways to...
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C. School Permission Letter .................................................................. 60
A numerical technique is presented for solving the gas dynamics
of a pulsating combustor. The computer solution which is developed
follows directly from the fundamental conservation laws applied to
discrete volumes rather than attempting either to finite difference the
resulting partial differential equations, or to apply the Method of Characteristics....
According to Block (1999), the greatest problem with inclusion in physical education is the lack of personnel support. Most help comes in the form of teacher assistants such as peer-tutors and paraprofessional who receive very little, if any, direction from the general physical education teacher. However, what remains unknown are...
The primary purpose of this study was to determine the effects
of an interdependent group-oriented contingency on the MVPA
levels of middle school students during the fitness portion of physical
education lessons. Participants were randomly selected target
students from three intact eighth grade classes.
A combination of a delayed multiple...
The stress concentration factors at butt joints in six-ply laminated
lumber were determined experimentally. Concentration factors
for a uniform tensile stress were found for a joint at each of
three possible locations.
Four experimental techniques were used and evaluated on actual
wood specimens: strain gages, brittle lacquer, moiré grids, and...
Dead weight creep tests were conducted on polycarbonate in
order to determine if it is a linear viscoelastic material; or if it is
not, then to determine the feasibility of photoplastic stress freezing.
Secondary objectives were: the determination of the parameters in the
creep compliance of a four element viscoelastic...