Digital Commons Network^™

Extracting The Relative Grain Boundary Free Energy And Mobility Functions From The Geometry Of Microstructures, Brent L. Adams, D. Kinderlehrer, W. W. Mullins, Anthony D. Rollett, Shlomo Ta'asan

Faculty Publications

This work was supported primarily by the MRSEC Program of the National Science Foundation under Award Number DMR-9632556. This paper describes a method for extracting, from measurements of a polycrystal, the relative excess free energy and the relative mobility of the grain boundaries as functions of the crystallographic type (five degrees of freedom) and relevant thermodynamic variables. The method requires the simultaneous measurement of both the geometry and the crystallography of a large number of grain boundary intersections; the crystallographic information may be obtained from orientation imaging microscopy (OIM). For simplicity, the intersections will be assumed to be triple junctions …

Nonlinear Optimal Control Of A Hydraulically Actuated Positioning System, Timothy Mclain, Randal W. Beard

Faculty Publications

In this paper, the nonlinear optimal control problem is formulated for the position control of an electrohydraulic servo system. The optimal control is given by the solution to the Hamilton-Jacobi-Bellman equation, which in this case cannot be solved explicitly. An alternative method, based upon successive Galerkin approximation, is used to obtain an approximate optimal solution. Preliminary simulation results, demonstrating the application of this approach to the position control of a hydraulically actuated device, are presented.

Mule Deer And Pronghorn Use Of Wastewater Ponds In A Cold Desert, Karen L. Cieminski, Lester D. Flake

Great Basin Naturalist

Pronghorn (Antilocapra americana) and mule deer (Odocoileus hemionus) were counted at wastewater ponds at the Idaho National Engineering and Environmental Laboratory (INEEL) in southeastern Idaho 4 to 8 times per month from August 1989 through July 1991. Mule deer used wastewater ponds (n = 15) from June through December and were most commonly observed August through November. Pronghorn frequented wastewater ponds from May through November and were most common from July through September, the driest and warmest months; ponds were also used heavily in November 1990. Diel activity was studied from July through October. Mule …

A Short Note On Current Chinese Online Book Dealers, Thomas H. Hahn

Journal of East Asian Libraries

No abstract provided.

The Mormon Battalion And The Gadsden Purchase, Richard O. Cowan

BYU Studies

The battalion's pioneering trek through uncharted territory left its mark on the U.S.-Mexican border and blazed a trail for the future Southern Pacific Railroad.

East Asian Librarians And The World Wide Web: Familiarization, Infiltration, Classification And Construction, Kristina Kade Troost

Journal of East Asian Libraries

No abstract provided.

Azimuthal Modulation Of C-Band Scatterometer Over Southern Ocean Sea Ice, David G. Long, David S. Early

Faculty Publications

In a continuing evaluation of the ERS-1 C-band scatterometer as a tool for studying polar sea ice, the authors evaluate the azimuthal modulation characteristics of Antarctic sea ice. ERS-1 AMI scatterometer mode data sets from several study regions dispersed in the Antarctic seasonal sea ice pack are evaluated for azimuthal modulation. When appropriate, the incidence angle dependence is estimated and removed in a study region before determining whether azimuthal modulation is present in the data. Other comparisons are made using the fore and aft beam measurement difference. The results show that over the ice pack, azimuthal modulation is less than …

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 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 …

From The Vineyard, Journal Of Book Of Mormon Studies

Journal of Book of Mormon Studies

This department gives news updates on various topics related to Book of Mormon studies: evidence of Chinese voyagers in Mexico, publicity on an ancient skull of a Caucasian male discovered in Washington, excavation of an ancient basilica in Jordan, Egyptian figurines from El Salvador shown to be fakes, and the establishment of a new journal, Pre-Columbiana: A Journal of Long-distance Contacts.

The "Prognostication" Of Asa Wild, Elden J. Watson

BYU Studies

Upstate New York newspapers in October 1823 carried a statement by a visionary soul who believed that God would soon open the way for a restoration of primitive Christianity.

Predicting The Viscosity Of Alkanes Using Nonequilibrium Molecular Dynamics: Evaluation Of Intermolecular Potential Models, Richard L. Rowley, William Allen

Faculty Publications

Nonequilibrium molecular dynamics (NEMD) viscosity simulations of branched and linear alkanes at liquid densities were performed using both united-atom (UA) and all-atom (AA) intermolecular potential models in order to study the relative efficacy of the models in predicting fluid viscosity. Both models were used in conjunction with fixed bond lengths and bond angles, but different torsional potentials were investigated. The commonly used Ryckaert—Bellemans intermolecular potential model, which accurately predicts viscosities for short straight-chain alkanes, produced values for branched and long-chain alkanes that were significantly below experimental values. Likewise, a more complex UA model that uses transferrable site potentials and is …

A Glimpse Of China, Ai-Hwa Wu

Journal of East Asian Libraries

No abstract provided.

Catching Up With Technology: Recent Developments In Chinese Libraries, Yuan Zhou

Journal of East Asian Libraries

No abstract provided.

Librarians As Information Providers: Constructing The "Center Of The Cultural Revolution Studies" On The Internet, Guoqing Li, Yongyi Song

Journal of East Asian Libraries

No abstract provided.

The Golden Age Of Roman Helvetia, H. Dwight Page

Swiss American Historical Society Review

Any traveller who had visited the region of present day Switzerland in the first century before Christ and who could have returned there three centuries later at the end of the second century of the Christian era would have been astonished by the differences between the two periods. Whereas the pre-Roman country of the Helvetii had been a vast forest whose inhabitants had lived in rudimentary hilltop oppida and had spent their lives hunting, fishing and tilling the soil of small farms, the Roman province of Helvetia in the third century after Christ was a prosperous nation whose citizens lived …

Full Issue

Swiss American Historical Society Review

No abstract provided.

Interannual Abundance Of Nonnative Fathead Minnows (Pimephales Promelas) In Upper Klamath Lake, Oregon, David C. Simon, Douglas F. Markle

Great Basin Naturalist

Since its introduction about 20 yr ago, fathead minnow (Pimephales promelas) has become very abundant in Upper Klamath Lake, Oregon. In 1991 mean beach seine catch per unit effort (CPUE) was 214, compared to 25 for native blue chub (Gila coerulea), the next most abundant species. In 45 trap-net samples collected in 1992, fathead minnow constituted 59% of the fishes caught in Agency Lake subbasin, 27% in Upper Klamath Lake, and 17% in tributary inflow habitats. From 1991 to 1995 fathead minnow declined and the abundance of some native fishes increased. Introduction to Klamath Basin was …

On-Line Cartesian Trajectory Control Of Mechanisms Along Complex Curves, Edward Red, Zhaoxue Yang

Faculty Publications

New methods have been developed to control a mechanism's realtime Cartesian motion along spatially complex curves such as Non-Uniform Rational B-splines (NURBS). The methods dynamically map the critical trajectory parameters between parameter space, Cartesian space, and joint space. Trajectory models that relate Cartesian tool speeds and accelerations to joint speeds and accelerations have been generalized so that they can be applied to most classes of robots and CNC mechanisms.

Secondary Dark Rings Of Internal Conical Refraction, Karl F. Warnick, David V. Arnold

Faculty Publications

This paper treats the phenomenon of internal conical refraction, in which a narrow beam propagating along an optical axis of a biaxial anisotropic medium spreads into a hollow cone. An expression is obtained for the intensity distribution produced by conical refraction that predicts additional fringes concentric to the well known Poggendorf dark ring for certain propagation distances and beam widths.

Technical Shibboleths, John S. Harris

Deseret Language and Linguistic Society Symposium

No abstract provided.

Network Technology: What Does It Mean To East Asian Libraries In North America?, Yuan Zhou

Journal of East Asian Libraries

No abstract provided.

East Asian Collection In The Global Information Network, Peter X. P. Zhou

Journal of East Asian Libraries

No abstract provided.

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 …

Effects Of Monomer Structure Ontheir Organization And Polymerizationin A Smectic Liquid Crystal, C. Allan Guymon, Erik N. Hoggan, Noal A. Clark, Thomas P. Rieker, David M. Walba, Christopher N. Bowman

Faculty Publications

Photopolymerizable diacrylate monomers dissolved in fluid-layer smectic A and smectic C liquid crystal (LC) hosts exhibited significant spatial segregation and orientation that depend strongly on monomer structure. Small, flexible monomers such as 1,6-hexanediol diacrylate (HDDA) oriented parallel to the smectic layers and intercalated, whereas rod-shaped mesogen-like monomers such as 1,4-di-(4-(6-acryloyloxyhexyloxy)benzoyloxy)-2-methylbenzene (C6M) oriented normal to the smectic layers and collected within them. Such spatial segregation caused by the smectic layering dramatically enhanced photopolymerization rates; for HDDA, termination rates were reduced, whereas for C6M, both the termination and propagation rates were increased. These polymerization precursor structures suggest novel materials-design paradigms for gel …

Zion Building: Writing About It And Doing It, T. Allen Lambert

Review of Books on the Book of Mormon 1989–2011

No abstract provided.

Sharlimar, Aaron Eastley

Inscape

No abstract provided.

Wile's Returns, Jacob Flint

Inscape

No abstract provided.

Mormonism On The Internet: Now Everybody Has A Printing Press, Gregory H. Taggart

Review of Books on the Book of Mormon 1989–2011

Mormon Websites include those with links to other sites and those with something substantive to offer. Numerous links to substantive websites are given.

John R. Farkas And David A. Reed. Mormonism: Changes, Contradictions, And Errors., Craig L. Foster

Review of Books on the Book of Mormon 1989–2011

Review of Mormonism: Changes, Contradictions, and Errors (1995), by John R. Farkas and David A. Reed