Educação matemática pela arte
Gusmão, Lucimar Donizete
2013-08-28
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66,926 records were found.
In this dissertation I examine population history and structure in the Maya area during
the Classic period (A.D. 250-900). Within the Maya area, archaeologists have identified
regional variation in material culture between archaeological zones. These cultural differences
may correspond to biological differences between Classic Maya populations. I test the
hypothesis that Classic Maya population structure followed an isolation by distance model. I
collected dental nonmetric and metric traits on 977 skeletons, from 18 Classic period sites,
representing seven different archaeological zones. I corrected the data for intraobserver error.
For the dental nonmetric data, I developed a Maya-specific trait dichotomization scheme and
controlled for sex bias. I tested the dental metric data for normality and age affects. I imputed
missing dental m...
Phosphofructokinase from Escherichia coli (EcPFK) is allosterically regulated
by MgADP and phospho(enol)pyruvate (PEP). Both molecules compete for binding to
the same allosteric site, however, MgADP activates and PEP inhibits the binding of
fructose-6-phosphate (F6P) to the active site. The mode by which this enzyme can
differentiate between the two ligands and cause the appropriate response is important for
the understanding of the basis of allosteric regulation.
We studied the interactions between an active site and an allosteric site
(heterotropic interactions) within the protein, and found that each of the four unique
heterotropic interactions is unique and the magnitudes of the coupling free energies for
MgADP activation sum up to 100% that of wildtype EcPFK without homotropic
cooperativity in F6P binding. We took on the kinetic a...
The Upper North Bosque River (UNBR) watershed is under a Total Maximum
Daily Load (TMDL) mandate to reduce Phosphorus (P) due to excess nutrients in the
watershed. To address these problems, Texas A&M University researchers have
developed a turfgrass sod Best Management Practice (BMP) to remove excess nutrients
from impaired watersheds. Turfgrass harvest of manure fertilized sod removes a thin
layer of topsoil with most of the manure applied P. Plot and field scale research has
demonstrated the effectiveness of turfgrass to remove manure phosphorus (P). In order
to assess the impact of the turfgrass BMP on a watershed scale, the Soil and Water
Assessment Tool (SWAT) was used to predict water quality in the UNBR watershed.
The SWAT model was modified to incorporate turfgrass harvest routines to predict
manure and soil P export through t...
Concentrated animal feeding operations (CAFOs) have caused water quality
concerns in many rural watersheds, sometimes forcing the State of Texas to conduct
Total Maximum Daily Load (TMDL) assessments of stream nutrients such as nitrogen
(N) and phosphorus (P). One suggested Best Management Practice (BMP) is the export
of phosphorus (P) through turfgrass sod produced with composted dairy manure from an
impaired rural watershed to an urban watershed. The manure-grown sod releases P
slowly and would not require additional P fertilizer for up to 20 years in the receiving
watershed. This would eliminate P application to the sod and improve the water quality
of urban streams.
The Soil and Water Assessment Tool (SWAT) was used to model a typical
suburban watershed that would receive the transplanted sod. The objective of the
modeling was to d...
The work presents investigations into the development of a fuel-powered compact SMA actuator system. For the final SMA actuator, the K-alloy SMA strip (0.9 mm x 2.5 mm), actuated by a forced convection heat transfer mechanism, was embedded in a rectangular channel. In this channel, a rectangular piston, with a slot to accommodate the SMA strip, ran along the strip and was utilized to prevent mixing between the hot and the cold fluid in order to increase the energy density of the system. The fuel, such as propane, was utilized as main energy source in order to achieve high energy and power densities of the SMA actuator system. Numerical analysis was carried out to determine optimal channel geometry and to estimate maximum available force, strain and actuation frequency. Multi-channel combustor/heat exchanger and micro-tube heat exchange...
Changes with land cover and land use are closely integrated with water and other
ecological processes at the land surface. Nowhere is that more apparent than in the
Edwards Aquifer region of southcentral Texas. The Edwards Aquifer contributing and
recharge zones cover approximately 18,000 square kilometers in parts of 15 counties in
Texas and includes San Antonio and Austin, the nation's eighth and nineteenth largest
cities, respectively. Population growth within the counties that intersect the Edwards
Aquifer contributing and recharge zones has taken place over the last two decades, with
the logical translation being an expanded infrastructure. This implies that a greater
amount of impervious surface coverage and other land cover changes have occurred.
This work quantified the changes in land cover within the Edwards Aquifer contribut...
This thesis contains an observational analysis of the genesis of Tropical Storm Allison (2001). Using a paradigm of tropical cyclone formation as the superposition of potential vorticity (PV) anomalies, the importance of different scales of PV merger to various aspects of Allisons formation is discussed. While only the case of Allison is discussed in great detail, other studies have also documented PV superposition on various scales, and superposition could be important for most tropical cyclones. Preceding Allisons genesis, PV superposition on the large scale destabilized the atmosphere and increased low-level cyclonic vorticity. This presented a more favorable environment for the formation of MCV-type PV anomalies and smaller, surface-based, meso-β-scale vortices. Although these vortices eventually merged to form a more concen...
During the period of June 29 through July 6, 2002, an extreme precipitation event occurred over Texas, resulting in catastrophic flooding. Operational forecasts performed poorly, neither predicting the copious amounts of rain nor its longevity. The Penn State University/NCAR Mesoscale Model version 5 (MM5) was used to conduct predictability experiments, which follow closely to the research conducted by Zhang et al. A control simulation initialized at 00Z 1 July is established over a 30-km grid. First, practical predictability experiments are performed by exploring the impacts due to different lead-times, resolution dependence, and different physics parameterizations. Second, intrinsic predictability is investigated by inducing a random temperature perturbation in the initial conditions, followed by numerous simulations with various per...
Community Climate Model 3 (CCM3) is run on an idealized all land zonally
symmetric planet (Terra Blanda) with no seasonality, no snow and fixed soil moisture
to obtain a stationary time series effectively much longer than conventional runs with
geography and seasons. The surface temperature field generated is studied to analyze
the spatial and temporal spectra, estimate the length scale and time scale of the
model, and test the linearity of response to periodic and steady heat source forcings.
The length scale of the model is found to be in the range of 1000-2000 km and the time
scale is estimated to be 24 days for the global average surface temperature field. The
response of the global average temperature is found to be fairly linear to periodic and
the steady heat source forcings. The results obtained are compared with the results
of...
Linoleum has been around for over a hundred years. With its invention by Frederick Walton in the 1860s a new means of durable floor covering was introduced to the world. This new invention was promoted as durable, hygienic, and easy to maintain. In agreement with the Lake Champlain Maritime Museum, a study was commissioned to seek the best means to conserve linoleum from a canal boat excavated in the summer of 2002 in Lake Champlain. The Sloop Island Canal Boat is part of an excavation project that is studying the ways of life on the lake. Conserving waterlogged linoleum is a new area of study in conservation, and there is very little information dealing with the topic. This study will provide a baseline for the conservation of linoleum.
