Atmospheric boundary layers become stably stratified at night over land when the surface becomes colder than the air layer above. In stable nocturnal boundary layers (SNBL), turbulence becomes weak and intermittent, terrain-induced phenomena such as drainage currents or gravity-waves emerge and the surface heterogeneity is enhanced. Because of their complexity...
Globally intermittent turbulence is characterized by sudden switching from significant turbulence to weak turbulence and back on time scales ranging from seconds to tens of minutes as opposed to microscale intermittency, which is due to organization of small scale gradients by individual eddies on scales as small as the Kolmogorov...
This study concentrates on analysis of LongEZ aircraft data taken offshore of the Atlantic Coast of the United States. Due to the land structure of the region, it was possible to isolate the effect of narrow land on air as it flows offshore. The narrow land (Outer Banks) separates inland...
The purpose of this study was to improve instructional system design at Small
Business Development Centers by developing a best practice model for assessing client
training needs. Two research questions were addressed:
1. Is self-directed learning an appropriate framework for instructional system design at
Small Business Development Centers?
2. What...
Recent trends in higher education have led to the development of
alternatives to traditional on-campus graduate degree programs. There is a
concomitant need to understand student experience in field-based programs
which support continuing education and career development for employed
adults. The central purpose of this research was to explore the...
This qualitative study describes and interprets the interactions of participants in a
community college writing class delivered by computer-mediated communication
(CMC). The class represented a best practice model of learner-centered instruction in a
CMC class. The description and the discussion are framed by five aspects of CMC
instruction: (1) context;...
Sudden changes occur where the mean values associated with two adjacent non-overlapping
windows of data are anomalously different, and the transition between the
window means occurs over a scale that is small relative to the scale of the windows.
Positions of sudden changes can be economically retrieved. The sudden change...
A two-scale approach for the turbulent mixing of momentum in an unstable stratified boundary layer is proposed in an attempt to eliminate existing inconsistencies between parameterized mixing of heat and momentum. The parameterization of the large eddy stress is suitable for simple boundary layer models where computational efficiency is important....
The statistics describing variations of turbulent motions within the so called inertial range of length scales depend on the scale over which the motions are varying and the "average" rate at which the turbulent kinetic energy is being dissipated on the molecular scale. This hypothesis stemmed from the similarity arguments...