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Thermal Equilibrium Of Warm Clouds Of Charge With Small Aspect Ratio, Deborah L. Paulson, Ross L. Spencer

Faculty Publications

Global thermal equilibrium computations are presented for non-neutral plasmas whose radial size is much larger than their axial thickness. Axial and radial density profiles are computed for both ideal and nonideal Penning trap fields. Simple results are obtained in the limits of both low and high central density. Comparison is made to the grid calculations of Mason et al. [Phys. Plasmas 3 (5), 1502 (1996)].

Bitterbrush (Purshia Tridentata Pursh) Growth In Relation To Browsing, Carl L. Wambolt, W. Wyatt Fraas, Michael R. Frisina

Great Basin Naturalist

The objectives of this study were to compare vegetative and reproductive growth characters of bitterbrush (Purshia tridentata Pursh) stands as they relate to browsing levels. Growth characters were measured on 10 ecologically diverse stands in southwestern Montana on which browsing ranged from 0% to 60% of all current annual long shoot (LS) growth. Bitterbrush plants exhibited both twig-level and plant-level responses to browsing. Total bud density per plant was similar for browsed and unbrowsed sites, but differed (P < 0.01) between browsed and unbrowsed twigs. Browsed twigs produced one-half the leaf cluster density produced by unbrowsed twigs. No significant (P < 0.05) relationship between browsing levels on browsed plants and bud densities was found. Length of old-growth twigs per plant was shorter (P < 0.001) on browsed sites than on unbrowsed sites. Burning at 2 environmentally paired sites reduced flower bud density (P < 0.001) 9 and 10 growing seasons later although LS length was not affected. Growth of LS showed a site-by-year interaction (P < 0.05). Our data suggest that long-term unbrowsed plants should not be used as a standard for comparison with normally browsed plants.

Vol. 10 Num. 2 Farms Review Of Books, Farms Review

Review of Books on the Book of Mormon 1989–2011

No abstract provided.

Mormons, Scripture, And The Ancient World: Studies In Honor Of John L. Sorenson, Davis Bitton

Maxwell Institute Publications

This multidisciplinary volume of essays was written by colleagues and former students of John L. Sorenson as a tribute to his lifetime of contributions to our understanding of Book of Mormon and anthropological scholarship.

The contributing authors present their original research findings on such diverse topics as nineteenth-century Mormon funeral sermons, the question of Nephite kingship, the Isaiah commentaries in the Book of Mormon, early Mormon publishing efforts in the Pacific Mission, and evidences of transoceanic diffusion in pre-Columbian times.

A Mathematical Model For Fibroblast And Collagen Orientation, J. C. Dallon, J. A. Sherratt

Faculty Publications

Due to the increasing importance of the extracellular matrix in many biological problems, in this paper we develop a model for fibroblast and collagen orientation with the ultimate objective of understanding how fibroblasts form and remodel the extracellular matrix, in particular its collagen component. The model uses integro-differential equations to describe the interaction between the cells and fibers at a point in space with various orientations. The equations are studied both analytically and numerically to discover different types of solutions and their behavior. In particular we examine solutions where all the fibroblasts and collagen have discrete orientations, a localized continuum …

Brigham Young University Independent Study On-Line Courses, Bret Alvey, Dave Boyack, Jon Macaulay, Derek Russell

Student Works

The purpose of this report is to provide information for BYU Independent Study to assist them in making management decisions in regards to the Internet courses. More specifically, the report will answer the following questions: What is the target marker for the Internet course? What previous marketing strategies were effective? What are additional ways to market the courses effectively? M.I.L.O. comprised of Bret Alvey, Dave Boyack, Jon Macaulay, Derek Russell.

Editor's Introducation: Fictionary, Daniel C. Peterson

Review of Books on the Book of Mormon 1989–2011

Introduction to the current issue, including editor's picks. Peterson examines “terminological trickiness” and lexical games, particularly as A. A. Howsepian employs them in a recent article in the distinguished journal Religious Studies.

Measurement Of The He Ground State Lamb Shift Via The Two-Photon 1 1S-2 1S Transition, Scott D. Bergeson, A. Balakrishnan, K. G. H. Baldwin, T. B. Lucatorto, J. P. Marangos, T. J. Mcilrath, T. T. O'Brian, S. L. Rolston, C. J. Sansonetti, Jesse Wen, N. Westbrook, C. H. Cheng, E. E. Eyler

Faculty Publications

We have extended two-photon Doppler-free spectroscopy to the vacuum ultraviolet spectral region, to accurately measure the He 1¹S-2¹S transition at 120 nm. Our result is 4984872315(48) MHz. This yields a ground state Lamb shift of 41104(48) MHz, in fair agreement with theory and other experiments. This approach has the potential for significantly better accuracy once improvements in the laser and the wavelength metrology are implemented.

Economic Valuation Models For Insurers, David F. Babbel, Craig B. Merrill

Faculty Publications

Recently much attention has been given to the approaches insurers undertake in valuing their liabilities and assets. For example, in 1994 the American Academy of Actuaries created a Fair Valuation of Liabilities Task Force to address the issue [see Doll et al. (1998), Reitano (1997), Babbel (1997, 1998b), Babbel and Merrill (1996), and Merrill (1997)]. In 1997, the Academy established a Valuation Law Task Force and a Valuation Tools Working Group to investigate the various valuation approaches extant and to recommend the models best suited to the task.

Much of the literature on valuation has focused on the strengths and …

Time-Resolved Studies Of Ultracold Ionizing Collisions, Scott D. Bergeson, C. Orzel, S. Kulin, S. L. Rolston

Faculty Publications

Using 40 ns laser pulses, we probe the real-time dynamics of ultracold ionizing collisions in metastable xenon. We time resolve both shielding and enhancement effects, and observe the production of Xe2^+ molecular ions through associative ionization. We estimate the rate of molecule formation in excited-state collisions, and directly measure the role of both flux enhancement and excited state survival in the collisional enhancement process. Conceptually simple theoretical models are used to predict the dynamics of the collisional shielding.

Bias And The Probability Of Generalization, Tony R. Martinez, D. Randall Wilson

Faculty Publications

In order to be useful, a learning algorithm must be able to generalize well when faced with inputs not previously presented to the system. A bias is necessary for any generalization, and as shown by several researchers in recent years, no bias can lead to strictly better generalization than any other when summed over all possible functions or applications. This paper provides examples to illustrate this fact, but also explains how a bias or learning algorithm can be “better” than another in practice when the probability of the occurrence of functions is taken into account. It shows how domain knowledge …

Unfolding Of The Period-Two Bifurcation In A Fiber Laser Pumped With Two Modulation Tones, Scott Glasgow, T. C. Newell, A. Gavrielides, V. Kovanis, D. Sukow, T. Erneux

Faculty Publications

The effect of a small second frequency component on a pump modulated neodymium fiber laser is investigated experimentally and theoretically. This term, whose frequency is exactly half the primary driver, incites an unfolding of the attractor. It breaks the period two pitchfork bifurcation and splits the period one orbit. The modification of the bifurcation diagram is studied analytically by employing a map derived from the class B laser rate equations. We determine specific conditions and scaling laws for this phenomenon. Our analytical predictions are in good agreement with recorded experimental data.

Robotic Tcf And Rigid-Body Calibration Methods, Edward Red, Xuguang Wang

Faculty Publications

For off-line programming to work, systematic methods must be developed to account for non-ideal performance of the parts and devices in the manufacturing cell. Although much of the literature focuses on robot inaccuracy, this paper considers practical methods for the tool control frame (TCF) calibration and rigid-body compensation required to close the inverse kinematics loop for target driven tasks.

System For Electron Paramagnetic Resonance Measurements At High Pressure And Low Temperature, Ke Huang, Daniel L. Decker, H. Mark Nelson, J. Dean Barnett

Faculty Publications

Major improvements have been made on the sensitive high pressure electron paramagnetic resonance (EPR) system developed previously in 1978 at this laboratory. These changes allow low temperature measurements and provide a more stable signal. The high pressure EPR cell is placed inside a vacuum chamber to provide thermal isolation, so that the system may be cooled by a closed cycle refrigerator to temperatures between 45 and 60 K, depending on the energy input to the modulation coil. The combination of high pressure and low temperature greatly expands the thermodynamic range over which EPR measurements can be made. An improved and …

Local Refinement Of Three-Dimensional Finite Element Meshes, M. L. Staten, Norman L. Jones

Faculty Publications

Mesh refinement is an important tool for editing finite element meshes in order to increase the accuracy of the solution. Refinement is performed in an iterative procedure in which a solution is found, error estimates are calculated, and elements in regions of high error are refined. This process is repeated until the desired accuracy is obtained.

Much research has been done on mesh refinement. Research has been focused on two-dimensional meshes and three-dimensional tetrahedral meshes ([1] Ning et al. (1993) Finite Elements in Analysis and Design, 13, 299–318; [2] Rivara, M. (1991) …

A Fluid In Contact With A Semipermeable Surface: Second-Order Integral Equation Approach, Douglas Henderson, Pawel Bryk, Stefan Sokolowski

Faculty Publications

An integral equation approach for a binary hard-sphere mixture interacting with a planar semipermeable wall (membrane) is formulated by using the second-order nonuniform or pair Ornstein–Zernike equation as well as the usual singlet Ornstein–Zernike equation. The results of the pair theory are compared with those obtained from the singlet theory and with computer simulation data. The pair approach is more accurate than the singlet theory.

A Unified Green's Function Analysis Of Complicated Dfb Lasers, Jim D. Freeze, Michael A. Jensen, Richard H. Selfridge

Faculty Publications

An efficient full-wave analysis technique for one-dimensional optical domains, known as the recursive Green's function method (RGFM), is presented for evaluation of distributed feedback (DFB) laser cavities with arbitrary material profiles. The method first constructs the Green's function of an inhomogeneous domain and subsequently uses Green's theorem to determine the laser optical field, lasing wavelength, and threshold gain. The technique is applied to investigate the performance of three DFB laser structures: a chirped-grating configuration, a modulated stripe width design, and a reduced duty cycle complex-coupled device. These structures are evaluated in terms of their single-mode lasing behavior and the uniformity …

The Jewish/Nephite Lunar Calendar, Randall P. Spackman

Journal of Book of Mormon Studies

Nephite record keepers were very meticulous in monitoring the passage of time. Lehi’s departure from Jerusalem in the reign of Zedekiah marks the beginning of one formal reckoning of time. The prophesied 600-year window to the birth of Christ could well have been measured in lunar years. Lehi must have drawn on familiar Israelite calendrical practices to establish his calendar. Lehi’s descendants likely used twelve lunar months for their calendar without adding an occasional thirteenth month to adjust for the length of a solar year, which would solve the chronological problem of dating Lehi’s departure 600 years before the birth …

A Body Without Organs: Three Approaches- Cage, Bach, And Messiaen, Christian T. Asplund

Faculty Publications

Allow me to posit a traditional four-part division of the self into the spiritual, intellectual, emotional, and physical/sensual. This may be further simplified to a two-part division, one being the spiritual and the other being a trio of the other selves which collectively may be termed the natural self. Sacred activity in this context would be an effort to achieve communion between the spiritual self and other spiritual entities. Such communion would be, in fact, the self's highest goal and, ultimately, the only one worth all its efforts. True communion with other beings is only possible on this spiritual level, …

Grand Canonical Monte Carlo And Modified Singlet Integral Equations For The Density Profile Of A Yukawa Fluid Near A Planar Wall, Douglas Henderson, Wilmer Olivares-Rivas, Leo Degreve, Jacqueline Quintana

Faculty Publications

Results for the density profile for Yukawa molecules near a hard wall and an exponential attractive wall are presented for Grand Canonical Monte Carlo (GCMC) simulations, for the singlet hypernetted chain (HNC) integral equation and for a modified version of the Lovett–Mou–Buff–Wertheim (LMBW-1) which uses the exact contact value theorem. The results of the standard singlet HNC are quite poor. If the LMBW equation is modified (but still using the bulk direct correlation function) the results at high temperature become reasonable. However, the results at low temperatures, close to the bulk coexistence curve, are only a partial improvement. The contact …

Density, Distribution, And Habitat Of Flammulated Owls In Idaho, Craig Groves, Terry Frederick, Glenn Frederick, Eric Atkinson, Melonie Atkinson, Jay Shepherd, Gregg Servheen

Great Basin Naturalist

From 1990 to 1992 we surveyed for Flammulated Owls (Otus flammeolus) in 3 areas in Idaho: Salmon National Forest (SNF), Payette National Forest and adjacent Hells Canyon National Recreation Area (PNF-HCNRA), and Nez Perce National Forest (NPNF). We also collected and summarized information on all historic and modern records of Flammulated Owls in Idaho. Flammulated Owls were detected on 65% of 68 routes (2–16 km in length) surveyed at densities ranging from 0.04 to 1.25 singing males/40 ha. Owls were detected on survey routes as early as 10 May and as late as 23 July. Mean percent canopy …

Cognitive Metaphor And Literary Theory: Towards The New Philology, Donald C. Freeman

Deseret Language and Linguistic Society Symposium

No abstract provided.

Visualizing The Relationship Between Speech, Image And Writing, David J. Staley

Comparative Civilizations Review

No abstract provided.

Fossils In Technical Terminology, Marion K. Smith

Deseret Language and Linguistic Society Symposium

No abstract provided.

A Framework For Comparative Study Of Civilizations, Shuntaro Ito

Comparative Civilizations Review

No abstract provided.

The Large, The Small, And The Human Mind Roger Penrose, Abner Shimony, Nancy Cartwright, And Stephen Hawking, Hollis R. Johnson

BYU Studies

Roger Penrose, with Abner Shimony, Nancy Cartwright, and Stephen Hawking. The Large, the Small, and the Human Mind. Cambridge: Cambridge University Press, 1997. 185 pp. $19.95.

Natural Variability Of Vegetation, Soils, And Physiography In The Bristlecone Pine Forest Of The Rocky Mountains, Brigitte M. Ranne, William L. Baker, Tom Andrews, Michael G. Ryan

Great Basin Naturalist

Pinus aristata Engelm. forest vegetation in Colorado was studied to determine vegetation composition and the relationship between vegetation and environment. Species percent cover, tree size class, and environmental variables were recorded for 49 plots. Previously collected data for 4 plots from New Mexico were included. Environmental variables included latitude, longitude, elevation, slope, aspect, topographic position, parent material, percent rock cover, mean rock size, litter depth, estimated plot age class, and evidence of anthropogenic disturbance. Soils were analyzed for texture, depth, and percent carbon and nitrogen. Pinus aristata foliage was analyzed for percent nitrogen and phosphorus. Direct and indirect gradient analyses …

Teaching Electromagnetic Field Theory Using Differential Forms, Karl F. Warnick, Richard H. Selfridge, David V. Arnold

Faculty Publications

The calculus of differential forms has significant advantages over traditional methods as a tool for teaching electromagnetic (EM) field theory. First, films clarify the relationship between field intensity and flux density, by providing distinct mathematical and graphical representations for the two types of fields. Second, Ampere's and Faraday's laws obtain graphical representations that are as intuitive as the representation of Gauss's law. Third, the vector Stokes theorem and the divergence theorem become special cases of a single relationship that is easier for the student to remember, apply, and visualize than their vector formulations. Fourth, computational simplifications result from the use …

Comparative Power Of Three Author-Attribution Techniques For Differentiating Authors, John B. Archer, John L. Hilton, G. Bruce Schaalje

Journal of Book of Mormon Studies

Over the last twenty years, various objective author-attribution techniques have been applied to the English Book of Mormon in order to shed light on the question of multiple authorship of Book of Mormon texts. Two methods, one based on rates of use of noncontextual words and one based on word-pattern ratios, measure patterns consistent with multiple authorship in the Book of Mormon. Another method, based on vocabulary-richness measures, suggests that only one author is involved. These apparently contradictory results are reconciled by showing that for texts of known authorship, the method based on vocabulary-richness measures is not as powerful in …

About The Contributors, Journal Of Book Of Mormon Studies

Journal of Book of Mormon Studies

No abstract provided.