Physical Sciences and Mathematics Commons^™

A Study Of Omega Bands And Ps6 Pulsations On The Ground, At Low Altitude And At Geostationary Orbit, A. M. Jorgensen, Harlan E. Spence, T. J. Hughes, D. Mcdiarmid

Physics & Astronomy

We investigate the electrodynamic coupling between auroral omega bands and the inner magnetosphere. The goal of this study is to determine the features to which omega bands map in the magnetosphere. To establish the auroral-magnetosphere connection, we appeal to the case study analysis of the data rich event of September 26, 1989. At 6 magnetic local time (MLT), two trains of Ps6 pulsations (ground magnetic signatures of omega bands) were observed to drift over the Canadian Auroral Network For the OPEN Program Unified Study (CANOPUS) chain. At the same time periodic ionospheric flow patterns moved through the collocated Bistatic Auroral …

Criteria For Elves And Sprites On Schumann Resonance Observations, E. W. Huang, E. R. Williams, R. Boldi, S. Heckman, W. Lyons, Michael J. Taylor, C. Wong, T. Nelson

All Physics Faculty Publications

Ground flashes with positive polarity associated with both sprites and elves excite the Earth's Schumann resonances to amplitudes several times greater than the background resonances. Theoretical predictions for dielectric breakdown in the mesosphere are tested using ELF methods to evaluate vertical charge moments of positive ground flashes. Comparisons of the measured time constants for lightning charge transfer with the electrostatic relaxation time at altitudes of nighttime sprite initiation (50–70 km) generally validate the electrostatic assumption in predictions made initially by Wilson [1925]. The measured charge moments (Q dS = 200–2000 C-km) are large in comparison with ordinary negative lightning but …

Natural Resources Conservation Laws: A Report On 17 States And Their Selected Counties And Townships, Huong N. Tran, Liu-Hsiung Chuang, Carolyne L. Guss, Resource Economics And Social Sciences Division, Natural Resources Conservation Service, U.S. Department Of Agriculture

All U.S. Government Documents (Utah Regional Depository)

Laws are social institutions that guide social functions, declare social programs, and even project the visions of a governed society. In a democracy like the United States of America, laws exist at every level of government. Federal, state, and local agencies that have related missions work together as partners, and their staffs need to understand the legal requirements and limitations to better serve the constituents. Private citizens can also benefit from being aware of the laws of other jurisdictions that might serve as models for improving their laws and regulations. With this awareness the public spirit can be enhanced and …

Natural Resources Conservation Laws A Report On 17 States And Their Selected Counties And Townships, Huong N. Tran, Liu-Hsiung Chuang, Carolyne L. Guss, Resource Economics And Social Sciences Division, Natural Resources Conservation Service, U.S. Department Of Agriculture

All U.S. Government Documents (Utah Regional Depository)

Laws are social institutions that guide social functions, declare social programs, and even project the visions of a governed society. In a democracy like the United States of America, laws exist at every level of government. Federal, state, and local agencies that have related missions work together as partners, and their staffs need to understand the legal requirements and limitations to better serve the constituents. Private citizens can also benefit from being aware of the laws of other jurisdictions that might serve as models for improving their laws and regulations. With this awareness the public spirit can be enhanced and …

Guest Editorial: Special Section On Acousto-Optic Devices And Optical Information Processing: Research And Developments, Partha P. Banerjee, Ting-Chung Poon

Electrical and Computer Engineering Faculty Publications

This guest editorial provides an overview of the topical area and an introduction to the articles featured in the special section.

Examination Of Beam Propagation In Misaligned Holographic Gratings And Comparison With The Acousto-Optic Transfer Function Model For Profiled Beams, Monish Ranjan Chatterjee, David D. Reagan

Electrical and Computer Engineering Faculty Publications

A transfer function formalism developed earlier for the propagation of profiled optical beams through acousto-optic Bragg cells is revisited and applied to a thick holographic grating. The results based on the holographic coupled wave model and the acousto-optic multiple scattering model are shown to be compatible, and equivalent parameters such as the Q and grating strength are defined for the two systems. Results for a Gaussian spatial profile are numerically computed and compared. For the holographic grating, a profiled beam may be interpreted as an angular misalignment or Bragg-angle mismatch problem. The case of Bragg-wavelength mismatch is also investigated for …

A Comparison Of Eclectic Learning And Stagger, J. Cory Barker, Jargalsaihan Batsaihan

Faculty Publications

This project compares two machine-learning methods, Stagger and Eclectic on their classification correctness. Both systems were tested with real-world data sets previously used and tested in other machine learning and statistical literature. The Eclectic System performed better than Stagger on every data set.

Resource Partitioning Between Coyotes And Swift Foxes: Space, Time, And Diet, Ann M. Kitchen, Eric M. Gese, Edward R. Schauster

United States Department of Agriculture Wildlife Services: Staff Publications

In its current distribution and abundance, the swift fox (Vulpes velox) has been significantly reduced from its historic range. A possible cause is competition with, and predation by, coyotes (Canis latrans). We investigated the level of spatial, temporal, and dietary resource use overlap between swift foxes and coyotes at the Pinon Canyon Maneuver Site in southeastern Colorado. We captured and radio-tracked 73 foxes and 24 coyotes from April 1997 to August 1998. We collected 10 832 and 5350 locations of foxes and coyotes, respectively. Overall, home-range sizes of foxes and coyotes were 7.6 ± 0.5 (mean ± SE) …

Black Bear Damage To Forest Stands In Western Washington, William B. Stewart, Gary W. Witmer, Gary M. Koehler

United States Department of Agriculture Wildlife Services: Staff Publications

Cambium-feeding behavior by black bears (Ursus americanus), or bear damage, is a major reforestation problem in the Pacific Northwest. Historically, studies have measured the cumulative effects of damage over time, but few have viewed damage in the frame of one season. Bear damage occurring in 1996 was surveyed in areas of radio-marked bears in western Washington. Fresh damage occurred on 48% of bear location plots (n = 96). Douglas-fir (Pseudotsuga menziesii) (69%), western hemlock (Tsuga heterophylla) (19%), and Pacific silverfir (Abies amabilis) (10%) with a mean dbh of 25.1, 29.5, and 30.7cm, …

Studying The Importance Of Hurricanes To The Northern Gulf Of Mexico Coast, Gregory W. Stone, Ping Wang, David A. Pepper, J. M. Grymes Iii, Harry H. Roberts, Xiongping Zhang, S. A. Hsu, Oscar K. Huh

Geology Faculty Publications

A pilot study was recently begun dealing with the impacts and post-storm adjustment of barrier islands to severe storms along the northern Gulf of Mexico. The study, funded by the National Science Foundation, may lead to a more comprehensive understanding of coastal morphodynamics and longer term evolution of the coast in that area. Study of the recent impacts and post-storm adjustment of the area to Hurricane Georges is playing a very important role in enhancing our comprehension of the significance of these high-energy events in coastal dynamics.

A few hours before dawn on September 28, 1998, Hurricane Georges made landfall …

Center For Sustainable Agricultural Systems Newsletter, July/August 1999

Center for Sustainable Agricultural Systems: Newsletters (1993-2000)

Contents:

Biotechnology Issues Discussed at NABC Meeting in Lincoln

University Role in Biotechnology: How Do We Sustain Food Production?

CSAS Issues Volumes 10 and 11

SARE Marketing Conference in Lincoln This November

September 10 is Deadline for NCR SARE Preproposals

Nebraska Legislative Bills Study Management and Help Beginning Farmers/Ranchers

Voluntary Program Will Boost Organic Exports

Canada Introduces National Standard for Organic Agriculture

Merrigan to Head USDA's Agricultural Marketing Service

Nominations Sought for Steward of the Land Award

Thanks and Farewell, Glen

1-Butaneboronic Acid Binding To Aeromonas Proteolytica Aminopeptidase:  A Case Of Arrested Development, Carin C. De Paola, Brian Bennett, Richard C. Holz, Dagmar Ringe, Gregory A. Petsko

Physics Faculty Research and Publications

Hydrolases containing two metal ions connected by a bridging ligand catalyze reactions important in carcinogensis, tissue repair, post-translational modification, control and regulation of biochemical pathways, and protein degradation. The aminopeptidase from Aeromonas proteolytica serves as a paradigm for the study of such bridged bimetallic proteases since its three-dimensional structure is known to very high resolution and its catalytic reaction is amenable to spectroscopic examination. Herein, we report the X-ray crystal structure at 1.9 Å resolution of AAP complexed with 1-butaneboronic acid (BuBA). This structure suggests that this complex represents a snapshot of the proteolytic reaction in an arrested form between …

Models For Molybdenum Coordination During The Catalytic Cycle Of Periplasmic Nitrate Reductase From Paracoccus Denitrificans Derived From Epr And Exafs Spectroscopy, Clive S. Butler, John M. Charnock, Brian Bennett, Heather J. Sears, Ann J. Reilly, Stuart J. Ferguson, C. David Garner, David J. Lowe, Andrew J. Thomson, Ben C. Berks, David J. Richardson

Physics Faculty Research and Publications

The periplasmic nitrate reductase from Paracoccus denitrificans is a soluble two-subunit enzyme which binds two hemes (c-type), a [4Fe-4S] center, and a bis molybdopterin guanine dinucleotide cofactor (bis-MGD). A catalytic cycle for this enzyme is presented based on a study of these redox centers using electron paramagnetic resonance (EPR) and extended X-ray absorption fine structure (EXAFS) spectroscopies. The Mo(V) EPR signal of resting NAP (High g [resting]) has g_av = 1.9898 is rhombic, exhibits low anisotropy, and is split by two weakly interacting protons which are not solvent-exchangeable. Addition of exogenous ligands to this resting …

กิจกรรมสิ่งแวดล้อม

Thai Environment

No abstract provided.

ข่าวสิ่งแวดล้อม

Thai Environment

No abstract provided.

สัมภาษณ์ : รศ. ดร. สุนีย์ มัลลิกามาเลย "การมีส่วนร่วมของประชาชนในการจัดการสิ่งแวดล้อมตามรัฐธรรมนูญฉบับใหม่, ธนพรรณ สุนทระ, ชัยรัตน์ วงศ์กิจรุ่งเรือง

Thai Environment

No abstract provided.

โดมความร้อนเหนือมหานคร วิธีการตรวจวัดและแนวทางการควบคุม, จริยา บุญญวัฒน์, โทชิเอกิ อิชิโนเสะ, ทาเคฮิโก มิคามิ, ซาชิโอะ คูโบ

Thai Environment

No abstract provided.

การสำรวจและการจัดลำดับความสำคัญของปัญหาสิ่งแวดล้อมจากอุตสาหกรรมที่ควรพัฒนางานวิจัยเพื่อแก้ไข, เครือข่ายความร่วมมือมหาวิทยาลัยไทยด้านการจัดการสิ่งแวดล้อม

Thai Environment

No abstract provided.

มาช่วยลดมลภาวะกันเถอะ (Pollution Prevention), สุวรรณ สงค์ประชา

Thai Environment

No abstract provided.

ภัยมืดจากสารรบกวนฮอร์โมนที่อยู่รอบตัวเรา, จักรพงษ์ ลิมปนุสสรณ์

Thai Environment

No abstract provided.

แนะนำโครงการของสถาบันวิจัยสภาวะแวดล้อม : การพัฒนาเทคโนโลยีการบำบัดน้ำเสียโดยใช้วัสดุพื้นบ้าน (Development Of Wastewater Technology Using Indigenous Materials)

Thai Environment

No abstract provided.

Canadian Cooperative Wildlife Health Centre Newsletter, Volume 6-1, Summer 1999

Canadian Cooperative Wildlife Health Centre: Newsletters and Publications

Message of Appreciation-NonToxic Shot International News Cooperative Research with Aboriginal Groups CCWHC as Observers on Eastern Canadian Harp Seal Hunt "Emerging" Diseases Spinal Cord Degeneration in a Bald Eagle Common Loon Killed by Bald Eagle Mass Stranding of Long-Finned Pilot Whales on PEI Congenital Limb Deformity in a Red Fox Mycoplasmosis Epidemic in Evening and Pine Grosbeaks Fatal Sphaeridiotrema sp Infection in Lesser Scaup Aspergillosis in Mallard Ducks Septicemic Pasteurellosis-Elk Trumpter Swans-Wye Marsh Long-Eared Owls Canada Geese-Unusual Cases Poisoning of Bohemian Waxwings Polioencephalomalacia in Deer and Pronghorns Brucellosis in Marine Mammals of Arctic Canada

Observations And Interpretation Of Gravity Wave Induced Fluctuations In The O I (557.7 Nm) Airglow, G. Schubert, R. L. Walterscheid, Michael P. Hickey Ph.D., C. A. Tepley

Publications

Observations of fluctuations in the intensity and temperature of the O I (557.7 nm) airglow taken at Arecibo in 1989 are reported and interpreted on the assumption that they are caused by gravity waves propagating through the emission layer. The data give the magnitude of Krassovsky's ratio as 3.5 ± 2.2, at periods between about 5 and 10 hours. Comparison with theory shows that the gravity waves responsible for the measured airglow variations must have long wavelengths of several thousand kilometers. The observed phases of Krassovsky's ratio are in good agreement with theoretically predicted values at the long wavelengths and …

Newton Parameter Update Algorithm For Recurrent Neural Networks Applied To Adaptive System Identification And Control, Donald Allen Gates

Electrical & Computer Engineering Theses & Dissertations

This paper shows that the combination of a second-order neural network parameter update algorithm and internal network feedback can be effectively used for adaptive, nonlinear, dynamical system identification and control. Adaptive neural identification and control algorithms are typically utilized for real-time applications where the rate of adaptation is often critical. A fast, adaptive network parameter update algorithm is presented.

Simulation results show that this algorithm is capable of quickly identifying and adapting to changes in system parameters, making it feasible to use for real-time control and fault accommodation applications.

The Crest, Summer 1999, Virginia Institute Of Marine Science

Reports

Table of Contents:

• New Research Aquarium System
• Finfish Aquaculture at VIMS
• Virginia Creates State Research Reserve System
• Pollution-Laden Sediments In Constant Flux
• Survey of Mid-Atlantic Sea Scallop Closed Areas
• Pfiesteria Update
• New Computer Program Helps Planners Balance Growth, Protection
• Virginia Sea Grant to Administer Commercial Fishery Resource Program
• VIMS Stranded Sea Turtle Project Underway Coastal Sediments Offer Clues to Climate Change, Pollution
• Seemingly Barren Habitat Proves Vital for Economically Important Virginia Fish (juvenile flounder)

Laser Beam Profile Deformation Effect During Bragg Acousto-Optic Interaction: A Non-Paraxial Approximation, Ray S. Huang, Chen-Wen Tarn, Partha P. Banerjee, Doungchin Cao

Electrical and Computer Engineering Faculty Publications

It is commonly known that the spatial profiles of the diffracted light beams during Bragg acousto-optic interaction are distorted due to the Bragg angle selection mechanism. All the conventional studies on this effect use the paraxial approximation. But this approximation should be amended when the incident angle of the light is large enough that the diffracted light waves do not propagate closely along the optic axis of the acousto-optic diffraction system. By using a spatial Fourier transform approach, we rigorously study the light beam profile deformation effect of the diffracted light during the Bragg acousto-optic interaction beyond the paraxial approximation. …

Remote Sensing Of Natural Areas: Procedures And Considerations For Assessing Stress And Pollution, Jason Goldberg, James Perry, John Anderson, Virginia Institute Of Marine Science, Wetlands Program

Reports

No abstract provided.

Nitrate Reductase Activity, Nitrate Uptake And Iodine Speciation In The Marine Environment, Chin-Chang Hung

OES Theses and Dissertations

The present method for the determination of new production (NP) by measuring the uptake of added ¹⁵NO₃^– suffers from a number of limitations. In an attempt to improve this situation, this research examined the possibility of estimating ¹⁵NO₃– uptake by measuring the activity of nitrate reductase (NRA). In addition, because it has long been suspected that the biological reduction of IO₃^– to I^– may be mediated by nitrate reductase (NR), this research investigated the ability of NR to catalyze the reduction of iodate to iodide.

An improved method for the determination …

A Family Of Hierarchical Encoding Techniques For Image And Video Communications, Samah A. Senbel

Computer Science Theses & Dissertations

As the demand for image and video transmission and interactive multimedia applications continues to grow, scalable image and video compression that has robust behavior over unreliable channels are of increasing interest. These desktop applications require scalability as a main feature due to its heterogeneous nature, since participants in an interactive multimedia application have different needs and processing power. Also, the encoding and decoding algorithm complexity must be low due to the practical considerations of low-cost low-power receiver terminals. This requires image and video encoding techniques that jointly considers compression, scalability, robustness, and simplicity.

In this dissertation, we present a family …

Dynamic And Interactive 3d Simulation Over The World Wide Web, Rajesh Vennam

Electrical & Computer Engineering Theses & Dissertations

The thesis presents the development of a new and novel three-dimensional simulation tool over the WWW using Virtual Reality Modeling Language (VRML). VRML is a 3D analog to HTML and serves as a simple, multiplatform language for publishing 3D Web pages. In general, most people use VRML for developing three-dimensional models or worlds that provide little or no interaction for the users. This tool combines interaction and dynamic object creation. A thorough study of VRML is done to explore the features of VRML that could be combined to develop methodologies for creation of dynamic and interactive 3D objects over the …