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Search Results: 1 - 10 of 154549 matches for " Abbie H. Brown "
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Time Students Spend Reading Threaded Discussions in Online Graduate Courses Requiring Asynchronous Participation
Abbie H. Brown
International Review of Research in Open and Distance Learning , 2009,
Abstract: The authors report the results of a study that provides bases for comparison between the time necessary to participate in courses delivered asynchronously online and courses delivered in a traditional classroom setting. Weekly discussion threads from 21 sections of six courses offered as part of online, degree-granting, accredited, graduate programs were examined. The purpose of this research is to determine whether students are spending more or less time participating in an online course than in a traditional classroom.The discussion size (i.e., the number of words per discussion) was determined using the automatic word count function in MS Word. Once the word counts for each course section were determined, the average words per discussion were calculated. The authors used 180 words per minute to calculate the average reading time, based on the work of Ziefle (1998) and Carver (1985, 1990), in order to determine the average minutes per week a student spent reading the discussions.The study indicates that a typical, graduate-level, online, asynchronous discussion requires about one hour a week of reading time, and the time commitment for participatory activity is similar to that of traditional, face-to-face courses, given that it takes under two hours to compose initial messages and responses to the discussion prompt.Although these findings are informative, further research is recommended in the area of time spent on online course activities in terms of student hours earned to enable a direct focus on various student characteristics, such as English language competency and student level.
The Retention of Experienced Faculty in Online Distance Education Programs: Understanding Factors that Impact their Involvement
Tim Green,Jeffery Alejandro,Abbie H. Brown
International Review of Research in Open and Distance Learning , 2009,
Abstract: The study sought to determine factors that affect faculty decisions regarding their involvement in teaching online distance education courses. A survey was administered to online distance education faculty across the United States to determine those factors that encourage or discourage them from continuing to teach online courses. The factors were examined and reported from the standpoint of each of four faculty groups: (1) tenured, (2) tenure-track, (3) full-time non-tenured/fixed term, and (4) part-time/adjunct. From the survey responses (N = 135), a list of retention strategies that university administrators may use for retention of online distance education faculty are offered.
Second Life in Education: The Case of Commercial Online Virtual Reality Applied to Teaching and Learning
Abbie Brown,William Sugar
Themes in Science and Technology Education , 2009,
Abstract: Second Life is a three-dimensional, multi-user virtual environment that has attracted particularattention for its instructional potential in professional development and higher educationsettings. This article describes Second Life in general and explores the benefits and challengesof using it for teaching and learning.
Examining the Anatomy of a Screencast: Uncovering Common Elements and Instructional Strategies
William Sugar,Abbie Brown,Kenneth Luterbach
International Review of Research in Open and Distance Learning , 2010,
Abstract: The researchers engaged in cooperative inquiry in order to explore screencasts as online instructional tools. In total, each researcher analyzed 37 screencasts, which provided over two hours of instruction. The content area of these screencasts concentrated on teaching specific computing procedures (e.g., how to install web server software or how to add a table in a word processor). The researchers analyzed their own self-produced screencasts as well as those that were professionally produced. Analyses of the screencasts led the researchers to discover common structural components (i.e., bumpers, screen movement, and narration) and common instructional strategies (i.e., provide overview, describe procedure, present concept, focus attention, and elaborate content). By synthesizing the common structure and common instructional strategies, the researchers offer a framework for considering the role of screencasts as online instructional tools. To introduce a practical application of the framework, the researchers created a screencasting checklist, which may be used by online instructors and instructional designers to develop and assess their own screencasts. This initial work invites additional research and development in order to refine the screencasting framework and checklist.
The effects of a pre-workout supplement containing caffeine, creatine, and amino acids during three weeks of high-intensity exercise on aerobic and anaerobic performance
Abbie E Smith, David H Fukuda, Kristina L Kendall, Jeffrey R Stout
Journal of the International Society of Sports Nutrition , 2010, DOI: 10.1186/1550-2783-7-10
Abstract: Twenty-four moderately-trained recreational athletes (mean ± SD age = 21.1 ± 1.9 yrs; stature = 172.2 ± 8.7 cm; body mass = 66.2 ± 11.8 kg, VO2max = 3.21 ± 0.85 l·min-1, percent body fat = 19.0 ± 7.1%) were assigned to either the active supplement (GT, n = 13) or placebo (PL, n = 11) group. The active supplement (Game Time?, Corr-Jensen Laboratories Inc., Aurora, CO) was 18 g of powder, 40 kcals, and consisted of a proprietary blend including whey protein, cordyceps sinensis, creatine, citrulline, ginseng, and caffeine. The PL was also 18 g of powder, 40 kcals, and consisted of only maltodextrin, natural and artificial flavors and colors. Thirty minutes prior to all testing and training sessions, participants consumed their respective supplements mixed with 8-10 oz of water. Both groups participated in a three-week HIIT program three days per week, and testing was conducted before and after the training. Cardiovascular fitness (VO2max) was assessed using open circuit spirometry (Parvo-Medics TrueOne? 2400 Metabolic Measurement System, Sandy, UT) during graded exercise tests on a treadmill (Woodway, Pro Series, Waukesha, WI). Also, four high-speed runs to exhaustion were conducted at 110, 105, 100, and 90% of the treadmill velocity recorded during VO2max, and the distances achieved were plotted over the times-to-exhaustion. Linear regression was used to determine the slopes (critical velocity, CV) and y-intercepts (anaerobic running capacity, ARC) of these relationships to assess aerobic and anaerobic performances, respectively. Training volumes were tracked by summing the distances achieved during each training session for each subject. Percent body fat (%BF) and lean body mass (LBM) were assessed with air-displacement plethysmography (BOD POD?, Life Measurement, Inc., Concord, CA).Both GT and PL groups demonstrated a significant (p = 0.028) increase in VO2max from pre- to post-training resulting in a 10.3% and 2.9% improvement, respectively. CV increased (p = 0.036
Allometry for Biomass Estimation in Jatropha Trees Planted as Boundary Hedge in Farmers’ Fields
Stephy D. Makungwa,Abbie Chittock,David L. Skole,George Y. Kanyama-Phiri,Iain H. Woodhouse
Forests , 2013, DOI: 10.3390/f4020218
Abstract: Regrowth and planted trees in agricultural landscapes are rarely protected from clearing under national Forest Acts. There is, therefore, some question over the long-term security of any value they might provide to biodiversity and the global carbon cycle. Engaging landholders in carbon credits that are conditioned on planted areas being maintained into the future could improve the situation. To begin carbon trading, landholders need precise and accurate estimates of the carbon sequestered by the trees in their fields. Accurate estimates of carbon stocks depend to a greater degree on the availability and adequacy of the allometric equations that are used to estimate tree biomass. The present study has developed an allometric model for estimating the woody biomass of Jatropha trees planted as boundary hedges in agricultural landscapes under smallholder farming systems in Malawi. The predictive performance of the model was assessed and was subsequently compared with the published Jatropha models. The results showed that the statistical fits of our model were generally good, enabling one to use it with confidence for estimating wood biomass in Jatropha stands from which they were derived. The published Jatropha models consistently overestimated the woody biomass by as much as 55%, rendering them unsuitable for application in estimating woody biomass in our study sites.
Pollination of a Canary Tree Flower
Abbie O'Hern Weeks
Undergraduate Journal of Mathematical Modeling : One + Two , 2010, DOI: 10.5038/2326-3652.3.1.17
Abstract: Pollination is an essential part of the life cycle of flowering plants. We perform an experiment to determine how long a canary tree flower is accessible to pollinating insects so that fertilization can take place. We conducted an observational study where we measured the size of the same flower and charted its growth each day. With the observational data we constructed a scatter plot and from the graph we fit a cubic function to the data. We conclude that in the lifespan of a canary tree flower, pollination begins at 5 1/2 days and ends approximately 9 days later.
On the Kazhdan--Lusztig cells in type $E_8$
Meinolf Geck,Abbie Halls
Mathematics , 2014,
Abstract: In 1979, Kazhdan and Lusztig introduced the notion of "cells" (left, right and two-sided) for a Coxeter group $W$, a concept with numerous applications in Lie theory and around. Here, we address algorithmic aspects of this theory for finite $W$ which are important in applications, e.g., run explicitly through all left cells, determine the values of Lusztig's $\ba$-function, identify the characters of left cell representations. The aim is to show how type $E_8$ (the largest group of exceptional type) can be handled systematically and efficiently, too. This allows us, for the first time, to solve some open questions in this case, including Kottwitz' conjecture on left cells and involutions. Further experiments suggest a characterisation of left cells, valid for any finite $W$, in terms of Lusztig's $\ba$-function and a slight modification of Vogan's generalized $\tau$-invariant.
Improved Measurement of the Positive Muon Anomalous Magnetic Moment
H. N. Brown
Physics , 2000, DOI: 10.1103/PhysRevD.62.091101
Abstract: A new measurement of the positive muon's anomalous magnetic moment has been made at the Brookhaven Alternating Gradient Synchrotron using the direct injection of polarized muons into the superferric storage ring. The angular frequency difference omega_{a} between the angular spin precession frequency omega_{s} and the angular orbital frequency omega_{c} is measured as well as the free proton NMR frequency omega_{p}. These determine R = omega_{a} / omega_{p} = 3.707~201(19) times 10^{-3}. With mu_{mu} / mu_{p} = 3.183~345~39(10) this gives a_{mu^+} = 11~659~191(59) times 10^{-10} (pm 5 ppm), in good agreement with the previous CERN and BNL measurements for mu^+ and mu^-, and with the standard model prediction.
Stochastic spatial models of plant diseases
David H. Brown
Mathematics , 2001,
Abstract: I present three models of plant--pathogen interactions. The models are stochastic and spatially explicit at the scale of individual plants. For each model, I use a version of pair approximation or moment closure along with a separation of timescales argument to determine the effects of spatial clustering on threshold structure. By computing the spatial structure early in an invasion, I find explicit corrections to mean field theory. In the first chapter, I present a lattice model of a disease that is not directly lethal to its host, but affects its ability to compete with neighbors. I use a type of pair approximation to determine conditions for invasions and coexistence. In the second chapter, I study a basic SIR epidemic point process in continuous space. I implement a multiplicative moment closure scheme to compute the threshold transmission rate as a function of spatial parameters. In the final chapter, I model the evolution of pathogen resistance when two plant species share a pathogen. Evolution may lead to non--resistance by a host that finds the disease to be a useful weapon. I use a lattice model with the ordinary pair approximation assumption to study phenotypic evolution via repeated invasions by novel strains.
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