30,858 research outputs found
Basic hydrogeologic and remote sensing data for selection of sanitary landfill sites
Solid waste disposal were studied in Volusia County to protect the water supply in the area. Highlands in this County are of limited areal extent and, most significantly, the sand hills and ridges are in areas where recharge of the Floridan aquifer occurs. This study proves that well drained soils meeting the current State requirements are of limited areal extent. These areas should not be utilized as sanitary landfill sites! Rather, it is recommended that the Tomoka Farm Road site into the adjacent wetlands be extended. The County site on Rima Ridge recommended by Greenleaf-Telesca as the primary waste burial site in the County should be re-evaluated because of potential danger to the Daytona Beach water supply
Hydraulics and geology related to beach restoration in Lee County, Florida
The erosion problem on Captiva Island is discussed. It is due to a deficit in the sand budget of the littoral drift system; a system with losses due to attrition of the particles and mass losses into the lagoons, to offshore, and to lateral transport. The effect that reopening Blind Pass would have, and the placement of sediment retaining structures in the surf zone at the northern and southern limits of the Captiva beach system, wave examined. A geological approach was used to study the origin and dynamic changes that have occurred. Through hydraulic modeling, changes that will occur by reopening and stabilizing Blind Pass are predicted. It is concluded that if the island is to be stabilized, beach nourishment with proper amounts and particle size is a necessity and that jetties adequate to restrict lateral and offshore losses are essential. It is shown that the reopening of Blind Pass would have minimal effects on the passes to the north and south, and would improve the environmental conditions in the sound with no adverse effects on the beach system
The Role of Cold Flows in the Assembly of Galaxy Disks
We use high resolution cosmological hydrodynamical simulations to demonstrate
that cold flow gas accretion, particularly along filaments, modifies the
standard picture of gas accretion and cooling onto galaxy disks. In the
standard picture, all gas is initially heated to the virial temperature of the
galaxy as it enters the virial radius. Low mass galaxies are instead dominated
by accretion of gas that stays well below the virial temperature, and even when
a hot halo is able to develop in more massive galaxies there exist dense
filaments that penetrate inside of the virial radius and deliver cold gas to
the central galaxy. For galaxies up to ~L*, this cold accretion gas is
responsible for the star formation in the disk at all times to the present.
Even for galaxies at higher masses, cold flows dominate the growth of the disk
at early times. Within this modified picture, galaxies are able to accrete a
large mass of cold gas, with lower initial gas temperatures leading to shorter
cooling times to reach the disk. Although star formation in the disk is
mitigated by supernovae feedback, the short cooling times allow for the growth
of stellar disks at higher redshifts than predicted by the standard model.Comment: accepted to Ap
Separation of biological materials in microgravity
Partition in aqueous two phase polymer systems is a potentially useful procedure in downstream processing of both molecular and particulate biomaterials. The potential efficiency of the process for particle and cell isolations is much higher than the useful levels already achieved. Space provides a unique environment in which to test the hypothesis that convection and settling phenomena degrade the performance of the partition process. The initial space experiment in a series of tests of this hypothesis is described
An Exploratory Study of Forces and Frictions affecting Large-Scale Model-Driven Development
In this paper, we investigate model-driven engineering, reporting on an
exploratory case-study conducted at a large automotive company. The study
consisted of interviews with 20 engineers and managers working in different
roles. We found that, in the context of a large organization, contextual forces
dominate the cognitive issues of using model-driven technology. The four forces
we identified that are likely independent of the particular abstractions chosen
as the basis of software development are the need for diffing in software
product lines, the needs for problem-specific languages and types, the need for
live modeling in exploratory activities, and the need for point-to-point
traceability between artifacts. We also identified triggers of accidental
complexity, which we refer to as points of friction introduced by languages and
tools. Examples of the friction points identified are insufficient support for
model diffing, point-to-point traceability, and model changes at runtime.Comment: To appear in proceedings of MODELS 2012, LNCS Springe
Observations of ground-state OH in the Large Magellanic Cloud
We have carried out a series of observations of the 1665- and 1667-MHz
transitions of the 2Pi_3/2, J=3/2 OH ground state towards six selected HII
regions in the Large Magellanic Cloud (IRAS 05011-6815 and MRC 0510-689,
0513-694B, 0539-691, 0540-696B, 0540-697A) using the Australia Telescope
Compact Array. The study has provided the first accurate positions for known
1665- and 1667-MHz OH masers as well as detecting several new masers. The
regions all contain H_2O or CH_3OH masers but OH masers were detected in only
four. The 1.6-GHz continuum emission was also imaged to investigate its spatial
relationship to the associated OH maser. Although some masers are close to
compact continuum components, in other cases they are near the continuum
distribution boundaries and perhaps have been created as a result of the HII
region interacting with the surrounding interstellar medium.Comment: Accepted for publication in MNRAS 6 pages, 9 figure
Ground-state OH observations towards NGC 6334
We have made observations of the four hyperfine transitions of the 2Pi(3/2),
J=3/2 ground state of OH at 1612, 1665, 1667 and 1720 MHz and the related
1.6-GHz continuum emission, towards NGC 6334 using the Australia Telescope
Compact Array. The observations covered all the major radio continuum
concentrations aligned along the axis of NGC 6334 (V, A to F). We have detected
seven OH masers plus a possible faint eighth maser; two of these masers are
located towards NGC 6334-A. Absorption at 1665 and 1667 MHz was detected
towards almost all the continuum distribution. All transitions showed non-LTE
behaviour. The 1667-/1665-MHz intensity ratios ranged from 1.0 to 1.2,
significantly less than their LTE value of 1.8. The results of the OH `Sum
Rule' suggest that this discrepancy cannot be explained solely by high optical
depths. The 1612- and 1720-MHz line-profiles showed conjugate behaviour whereby
one line was in absorption and the other in emission. In addition, the profiles
commonly showed a flip from absorption to emission and vice versa, which has
been interpreted as a density gradient. The OH line-to-continuum distribution,
optical depth and velocity trends are consistent with a bar-like shape for the
molecular gas which wraps around the continuum emission.Comment: 12 pages, 12 figures, accepted for publication in MNRA
Demixing kinetics of phase separated polymer solutions in microgravity
Phase separated solutions of two neutral polymers in buffer provide a useful and versatile medium for the partition separation of biological cells. However, the efficiency of such separations is orders of magnitude lower than the thermodynamic limit. To test the hypothesis that this inefficiency is at least partially due to the convection and sedimentation that occur during the gravity driven demixing that follows introduction of cells to the systems, a series of experiments were begun aimed at performing cell partition in a low g environment. Demixing of isopycnic three polymer solvent systems was studied, experiments were performed on KC-135 aircraft and one shuttle middeck experiment was completed. Analysis of the results of these experiments and comparisons with the predictions of scaling relations for the dependence of phase domain size on time, derived for a number of possible demixing mechanisms, are presented
Analysis and test evaluation of the dynamic response and stability of three advanced turboprop models
Results of dynamic response and stability wind tunnel tests of three 62.2 cm (24.5 in) diameter models of the Prop-Fan, advanced turboprop, are presented. Measurements of dynamic response were made with the rotors mounted on an isolated nacelle, with varying tilt for nonuniform inflow. One model was also tested using a semi-span wing and fuselage configuration for response to realistic aircraft inflow. Stability tests were performed using tunnel turbulence or a nitrogen jet for excitation. Measurements are compared with predictions made using beam analysis methods for the model with straight blades, and finite element analysis methods for the models with swept blades. Correlations between measured and predicted rotating blade natural frequencies for all the models are very good. The IP dynamic response of the straight blade model is reasonably well predicted. The IP response of the swept blades is underpredicted and the wing induced response of the straight blade is overpredicted. Two models did not flutter, as predicted. One swept blade model encountered an instability at a higher RPM than predicted, showing predictions to be conservative
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