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2006

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Microwave Observations Of Daily Antarctic Sea-Ice Edge Expansion And Contraction Rates, David G. Long, Jeffrey R. Allen Jan 2006

Microwave Observations Of Daily Antarctic Sea-Ice Edge Expansion And Contraction Rates, David G. Long, Jeffrey R. Allen

Faculty Publications

Algorithms for estimating sea-ice extent from remotely sensed microwave sensor data can benefit from knowledge of the "a priori" distribution of the daily expansion and contraction of the sea-ice pack. To estimate the probability distribution of daily Antarctic sea-ice extent change, two independent sea-ice datasets are analyzed: sea-ice extent derived from the QuikSCAT scatterometer and ice concentration estimates from the Special Sensor Microwave/Imager. The daily sea-ice advance and retreat is tracked over a four-year period. The distribution of the daily sea-ice advance/retreat from each sensor is similar and is approximately double-exponential. Daily ice-pack statistics are presented.

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Information Commons At Brigham Young University: Past, Present, And Future, Michael J. Whitchurch, Jeffrey C. Belliston, William Baer Jan 2006

Information Commons At Brigham Young University: Past, Present, And Future, Michael J. Whitchurch, Jeffrey C. Belliston, William Baer

Faculty Publications

Purpose: The purpose of this paper is to show that the idea and implementation of information commons is becoming more prevalent in the academic library community. Many of these have been implemented in what were once General Reference areas of libraries. This paper discusses the process and experience of the Harold B. Lee Library at Brigham Young University, including concept development, acceptance and implementation. In addition, the first 18 months of operation and our visions for the future of our implementation are contained herein. One of the major themes of the paper is that change in an information commons is …

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Mathematically Modeling The Effects Of Counting Factor (Cf) In Dictyostelium Discoideum, J. C. Dallon, W. Jang, R. H. Gomer Jan 2006

Mathematically Modeling The Effects Of Counting Factor (Cf) In Dictyostelium Discoideum, J. C. Dallon, W. Jang, R. H. Gomer

Faculty Publications

Size regulation is a crucial feature in many biological systems, with misregulation leading to dysplasia or hyperplasia. The recent discovery of counting factor (CF) in Dictyostelium discoideum will lead to a greater understanding of how the system regulates the size of a group of cells. In this paper we mathematically model the known effects of CF using two different models: a cellular automata model and a discrete continuum hybrid model. With the use of these models we are able to understand how modulation of adhesion and motile forces by CF can facilitate stream breakup. In addition, the modelling suggests a …

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Mi Mama Es Bonito: Acquisition Of Spanish Gender By Native English Speakers, Scott M. Alvord, Lisa Griebling Mccowen Jan 2006

Mi Mama Es Bonito: Acquisition Of Spanish Gender By Native English Speakers, Scott M. Alvord, Lisa Griebling Mccowen

Faculty Publications

For an adult, learning a second language can be a complex and demanding task. Differences between one’s native language and the target language can contribute to the complexity of the task. One significant way in which languages can differ is the system of gender. The difference between gender in English and Spanish provides a challenge for adult native English speakers learning Spanish as a second language. The aim of the current study is to examine gender marking on a variety of tasks by adult NS of English as beginning learners of Spanish, with hopes that such examination will provide insight …

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Determining Discount Rates For Valuing Properties In Distressed Industries, Hal B. Heaton Jan 2006

Determining Discount Rates For Valuing Properties In Distressed Industries, Hal B. Heaton

Faculty Publications

This study addresses the procedure for determining discount rates for properties in industries under stress. A simple example with fixed and variable costs, which could represent a company in any of these industries, is used to demonstrate the difficulties of using standard approaches for estimating cost of capital.

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Extending Taylor Plasticity Theory For Microscopic Slip Transfer Conditions, Brent L. Adams, Ray M. Merrill, John A. Basinger, Bassem S. El-Dasher Jan 2006

Extending Taylor Plasticity Theory For Microscopic Slip Transfer Conditions, Brent L. Adams, Ray M. Merrill, John A. Basinger, Bassem S. El-Dasher

Faculty Publications

This work was supported primarily by the MRSEC Program of the National Science Foundation under DMR-0079996. Most studies in crystal plasticity are based upon Taylor's original 1938 work. Within Taylor's framework the dependence of yield strength on microstructure, beyond lattice orientation, is carried within the critical resolved shear stress for slip. Thus, as the grain size decreases, the critical resolved shear stress is required to increase. This increase in critical resolved shear stress is applied, uniformly across the entire interior of the slipping grains according to the basic assumption of the model (uniform plastic strain or strain rate). It is …

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Cooperative Forest Fire Surveillance Using A Team Of Small Unmanned Air Vehicles, Randal Beard, David Casbeer, Derek Kingston, Timothy W. Mclain, Sai-Ming Li, Raman Mehra Jan 2006

Cooperative Forest Fire Surveillance Using A Team Of Small Unmanned Air Vehicles, Randal Beard, David Casbeer, Derek Kingston, Timothy W. Mclain, Sai-Ming Li, Raman Mehra

Faculty Publications

This research was supported by NASA under STTR contract No. NNA04AA19C to Scientific Systems Company, Inc (SSCI) and Brigham Young University (BYU), and by AFOSR grants F49620-01-1-0091 and F49620-02-C- 0094. The objective of this paper is to explore the feasibility of using multiple low-altitude, short endurance (LASE) unmanned air vehicles (UAVs) to cooperatively monitor and track the propagation of large forest fires. A real-time algorithm for tracking the perimeter of a fire with an on-board infrared sensor is developed. Using this algorithm, we develop a decentralized multiple-UAV approach to monitoring the perimeter of the fire. The UAVs are assumed to …

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Of Printers, Prophets, And Politicians: William Lyon Mackenzie, Mormonism, And Early Printing In Upper Canada, Richard Bennett, Daniel H. Olsen Jan 2006

Of Printers, Prophets, And Politicians: William Lyon Mackenzie, Mormonism, And Early Printing In Upper Canada, Richard Bennett, Daniel H. Olsen

Faculty Publications

Well-known in both Canadian and Latter-day Saint history is the arrival of Charles Ora Card and his faithful band of followers in southern Alberta in 1887. Less explored is the much earlier venture into Upper Canada (Ontario) of such prominent Mormon leaders as Joseph Smith, Brigham Young, Parley P. Pratt, Orson Pratt, Orson Hyde, and scores of others during the 1830s in their concerted attempts to promulgate their new faith on Canadian soil. Their success in converting hundreds of people, many of whom were British- and American-born Methodists or members of other nonconformist faiths, prompted Mormon leaders to send missionaries …

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