633 research outputs found
1947-07-31, Kenneth to William
https://digitalcommons.chapman.edu/wvasos_collection/1062/thumbnail.jp
Technology use in a middle school in 1997 and 2007
The purpose of this study was to determine if any changes in technology integration and adoption of computer technology had taken place at ABC Middle School from the initial pilot study in 1997 and the follow-up study in 2007. This research looked for changes in the teachers\u27 computer anxieties, attitudes and computer use from the previous study. Research showed that teacher anxiety had an impact on the teachers\u27 willingness to integrate the technology into their curriculum. So it is important to understand the anxiety level in order to assess the willingness-to-integrate level.;This study also looked at the computer technology infrastructure; including the physical components, connectivity, and training in 2007. A comparison was also made to see how the infrastructure had changed since 1996. Research showed that in order to have strong technology integration, the infrastructure must be kept up-to-date and accessible. Finally the study looked at the impact these changes had on the school. Technology impact looked the level (frequency of) integration, attitudes, and training in the school. Research showed that by having a strong technology strategy, the impact of the technology in the school increases.;Results from the study found that teachers have less anxiety towards using computers in 2007 than they did in 1997. There is an even more negative correlation between the level of anxiety and level of training. Teachers still had an overall positive attitude about the use of computers, but still have some frustrations. Lack of time, not enough of the right kind of training, and frustration over the outdated computers were major areas of concern that were found in the study.;The infrastructure of the school had definitely increased, with more computers and faster computers. Internet connection, e-mail and a Local Area Network also enhanced the technology in 2007. Other devices, such as the interactive whiteboard and increased security features have also been incorporated into the school. Teacher training had also become more specific. The level of training had increased from 1997 to 2007, yet many teachers still feel they could benefit from more training when it comes to using the new technology. Developing different training strategies and providing time and support for the teachers would enhance their technology integration.;Technology has had an impact on the teachers. Findings from this study showed that all of the teachers in 2007 were using the technology to some degree. Major uses include Edline(TM)/Gradequick, use of the Internet for lesson development, curriculum planning, and communicating with parents via e-mail. All of these are examples showing the teachers\u27 readiness in adopting the technology, and these applications were not even possible in 1997. Technology will be part of the future and it is important that the school continues to increase its infrastructure, provide support and training, and encourage technology to further enhance the education of the students. This study provided a guideline for the school to plan better ways to further integrate and implement the technology in the future
Analysis, design, fabrication and testing of an optical tip clearance sensor
Analyses and the design, fabrication, and testing of an optical tip clearance sensor with intended application in aircraft propulsion control systems are reported. The design of a sensor test rig, evaluation of optical sensor components at elevated temperatures, sensor design principles, sensor test results at room temperature, and estimations of sensor accuracy at temperatures of an aircraft engine environment are discussed. Room temperature testing indicated possible measurement accuracies of less than 12.7 microns (0.5 mils). Ways to improve performance at engine operating temperatures are recommended. The potential of this tip clearance sensor is assessed
Cation Exchange Equilibria in Mixed Solvents Sorption Characteristics of Common Metals from Water-Dimethyl Sulfoxide-Hydrochloric Acid Mixed Solvent
The systematic study of sorption of Ca, Cd, Co(II), Cu(II), Fe(III), Hg(II), In(III), La, Mn, Ni(II), Th(IV), Pb, Yb, U(VI), and Zn by Dowex 50 x 8 cation exchange resin from dimethyl sulfoxide-water-hydrochloric acid mixed solvent is presented. The sorption characteristics are much the same as those found for acetone-water-hydrochloric acid mixed solvent. Major differences occur in the case of Fe(III), Ca, Mg, and Pb. Many useful separations involving these elements are indicated
The Effect of a Nonionic Surface Active Agent on the Coprecipitation of Potassium with BaS04
Studies were made of the effect of potassium concentration on the amount of potassium coprecipitation with BaSO4, and the effect of a surface active agent, Triton-X 100, on the coprecipitation of potassium with BaSO4. It was found that a log-log plot of concentration of KC1 in the solution phase vs the amount of potassium coprecipitated was linear indicating that the Freundlich adsorption isotherm was followed. This indicated that the amount of potassium coprecipitated was determined by adsorption on crystalline BaSO4. The addition of Triton-X 100 reduced the coprecipitation of potassium by as much as 20% but the improvement was limited by miceller formation at a Triton-X 100 concentration of approximately 0.3%
Mars riometer system
A riometer (relative ionospheric opacity meter) measures
the intensity of cosmic radio noise at the surface of a planet.
When an electromagnetic wave passes through the
ionosphere collisions between charged particles (usually
electrons) and neutral gases remove energy from the wave.
By measuring the received signal intensity at the planet's
surface and comparing it to the expected value (the quietday
curve) a riometer can deduce the absorption
(attenuation) of the trans-ionospheric signal. Thus the
absorption measurements provide an indication of ionisation
changes occurring in the ionosphere.
To avoid the need for orbiting sounders riometers use the
cosmic noise background as a signal source. Earth-based
systems are not subject to the challenging power, volume
and mass restriction that would apply to a riometer for
Mars. Some Earth-based riometers utilise phased-array
antennas in order to provide an imaging capability.UnpublishedVienna - Austria3.9. Fisica della magnetosfera, ionosfera e meteorologia spazialeope
Phase lag in epidemics on a network of cities
We study the synchronisation and phase-lag of fluctuations in the number of
infected individuals in a network of cities between which individuals commute.
The frequency and amplitude of these oscillations is known to be very well
captured by the van Kampen system-size expansion, and we use this approximation
to compute the complex coherence function that describes their correlation. We
find that, if the infection rate differs from city to city and the coupling
between them is not too strong, these oscillations are synchronised with a well
defined phase lag between cities. The analytic description of the effect is
shown to be in good agreement with the results of stochastic simulations for
realistic population sizes.Comment: 10 pages, 6 figure
Neuronal activity patterns in microcircuits of the cerebellar cortical C3 zone during reaching
The cerebellum is the largest sensorimotor structure in the brain. A fundamental organizational feature of its cortex is its division into a series of rostrocaudally elongated zones. These are defined by their inputs from specific parts of the inferior olive and Purkinje cell output to specific cerebellar and vestibular nuclei. However, little is known about how patterns of neuronal activity in zones, and their microcircuit subdivisions, microzones, are related to behaviour in awake animals. In the present study, we investigated the organization of microzones within the C3 zone and their activity during a skilled forelimb reaching task in cats. Neurons in different microzones of the C3 zone, functionally determined by receptive field characteristics, differed in their patterns of activity during movement. Groups of Purkinje cells belonging to different receptive field classes, and therefore belonging to different microzones, were found to collectively encode different aspects of the reach controlled by the C3 zone. Our results support the hypothesis that the cerebellar C3 zone is organized and operates within a microzonal frame of reference, with a specific relationship between the sensory input to each microzone and its motor output. (Figure presented.). Key points: A defining feature of cerebellar organization is its division into a series of zones and smaller subunits termed microzones. Much of how zones and microzones are organized has been determined in anaesthetized preparations, and little is known about their function in awake animals. We recorded from neurons in the forelimb part of the C3 zone ‘in action’ by recording from single cerebellar cortical neurons located in different microzones defined by their peripheral receptive field properties during a forelimb reach–retrieval task in cats. Neurons from individual microzones had characteristic patterns of activity during movement, indicating that function is organized in relation to microcomplexes
Components of multifractality in the Central England Temperature anomaly series
We study the multifractal nature of the Central England Temperature (CET)
anomaly, a time series that spans more than 200 years. The series is analyzed
as a complete data set and considering a sliding window of 11 years. In both
cases, we quantify the broadness of the multifractal spectrum as well as its
components defined by the deviations from the Gaussian distribution and the
influence of the dependence between measurements. The results show that the
chief contribution to the multifractal structure comes from the dynamical
dependencies, mainly the weak ones, followed by a residual contribution of the
deviations from Gaussianity. However, using the sliding window, we verify that
the spikes in the non-Gaussian contribution occur at very close dates
associated with climate changes determined in previous works by component
analysis methods. Moreover, the strong non-Gaussian contribution found in the
multifractal measures from the 1960s onwards is in agreement with global
results very recently proposed in the literature.Comment: 21 pages, 10 figure
Semiclassical mechanics of a non-integrable spin cluster
We study detailed classical-quantum correspondence for a cluster system of
three spins with single-axis anisotropic exchange coupling. With autoregressive
spectral estimation, we find oscillating terms in the quantum density of states
caused by classical periodic orbits: in the slowly varying part of the density
of states we see signs of nontrivial topology changes happening to the energy
surface as the energy is varied. Also, we can explain the hierarchy of quantum
energy levels near the ferromagnetic and antiferromagnetic states with EKB
quantization to explain large structures and tunneling to explain small
structures.Comment: 9 pages. For related works see
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