Physical Sciences and Mathematics Commons^™

The Prairie Naturalist Volume 23, No. 4. December 1991

The Prairie Naturalist

Paul B. Kannowski, Editor

Nikki R. Seabloom, Assistant Editor

Douglas H. Johnson, Book Review Editor

CONTENTS

KENTUCKY BLUEGRASS RESPONSE TO BURNING: INTERACTIONS BETWEEN FIRE AND SOIL MOISTURE ▪ G. W. Blankespoor and B. S. Bich

FORAGE PRODUCTION AND USE ON BIGHORN SHEEP WINTER RANGE

FOLLOWING SPRING BURNING IN GRASSLAND AND PONDEROSA PINE HABITATS ▪ T. G. Easterly and K. J. Jenkins

SHORT-TERM MORTALITY OF SMALLMOUTH BASS CAUGHT DURING A LIVE-RELEASE TOURNAMENT AT LAKE OAHE, SOUTH DAKOTA ▪ J. J. Jackson and D. W. Willis

CRAYFISH IN SAND LAKE NATIONAL WILDLIFE REFUGE ▪ C. D. Dieter

PIPING PLOVERS NEST ON DRY …

Bird Response To Monofilament Lines At Backyard Feeders, Kimberly K. Kessler

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Biology And Ecology Of Dioryctria Ponderosae Dyar And Dioryctria Tumicolella Mutuura, Munroe And Ross, Mark A. Brohman

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Ecological Aspects Of Burrowing Owl Nesting Strategies In The Nebraska Panhandle, Martha J. Desmond

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Biology And Ecology Of Dioryctria Ponderosae Dyar And Dioryctria Tumicolella Mutuura, Munroe And Ross, Mark A. Brohman

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Water Current, Volume 23, December 1991

Water Current Newsletter

Massengale Presents Challenges at University Water Policy Forum
Governor Nelson Discusses Environmental Concerns at Nebraska Groundwater Foundation Luncheon
Report from the Director: Education and Research High Priorities
Surveys of Water-Related College-Education and Employment in Nebraska
California's Water Problems Explained at NGF Symposium
Cancer and Water Quality, Topic of Seminar
Wetlands Topic for 1992 Nebraska Water Conference
Environmental Cleanup Liabilities Farmers Should Consider
Eight States Evaluated in Groundwater Quality Research
Hungarian Students, Researchers to Collaborate in Environmental Degradation Studies

The Probe, Issue 117 - December 1991

The Probe: Newsletter of the National Animal Damage Control Association

THE PROBE
National Animal Damage Control Association
DECEMBER 1991
Evaluating Performance of the Soft-Catch® Coyote Trap
Calendar of Upcoming Events
President Bush Has Unique Style Of Animal Damage Control
Soft-Catch® Traps...
Animal Damage Control in the News:
It’s the “Gull War” at Kennedy International
Cyanide Baits May Be Allowed on BLM Land
Pocket Gopher Control Evaluation at Rogue River National Forest
“USA” Today Lists Predator Protection Tips
International Resolution Supports Regulated Trapping
Over Forty NADCA Members Attend 5th Eastern Wildlife Damage Control Conference
USDA Is Helping to Limit Rabies Outbreak In Texas
Wildlife Veterinarians Adopt Position Statement on Oral Rabies …

Groundwater Levels In Nebraska, 1990, Gregory V. Steele, Perry B. Wigley

Conservation and Survey Division

No abstract provided.

Photoemission And Electronic Structure Of Tungsten-Based Metallic Glasses And Alloys , M.A. Engelhardt, Sitaram Jaswal, David J. Sellmyer

David Sellmyer Publications

The structure and electronic density of states of intertransition-metal glasses of the form T_xW_1-x have been investigated, where T=Cu, Ni, and Co. The film samples were prepared by cosputtering in a chamber with a rapidly rotating, water-cooled substrate. Experiments included x-ray diffraction and ultraviolet photoemission at photon energies of 21.2 and 40.8 eV, and electronic-structure calculations were performed with a self-consistent linear combination of muffin-tin-orbitals method. For the calculations the structures were simulated by either disordered crystalline or amorphous clusters of 60–64 atoms in a periodically extended supercell. The range of amorphous alloy formation was determined …

Test 1656: Ford 5640 (16x4) Diesel 16-Speed, Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF THE TEST PROCEDURE General Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure. The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …

Magnetic And Structural Properties Of Co/Cr Multilayers With In-Plane Anisotropy, D. Wang, David J. Sellmyer

David Sellmyer Publications

Previously we studied the effect of Cr spacer layer on in-plane coercivity in Co/Cr multilayered films. It was found that the high coercivity is related to the easy axis in-plane orientation and the character of the composition modulation. In this paper, the dependence of the saturation magnetization as a function of Co layer thickness is used to study the interface structure. The layer structure is confirmed by small angle x-ray diffractometry for typical films. The magnetic interaction among the grains is studied by examining deviation from the behavior predicted by the Wohlfarth model for noninteracting single-domain particles. Journal of Applied …

Studies Of Domain Dynamics In Amorphous Dy/Fe Multilayers, Roger D. Kirby, J.X. Shen, Z.S. Shan, David J. Sellmyer

Roger Kirby Publications

Compositionally-modulated Dy/Fe films were prepared by dc magnetron sputtering onto glass substrates. For this series of samples, the Dy thickness was fixed at 5 Å, while the Fe thickness was varied from 4 to 6 Å. To study the magnetization reversal, the samples were first saturated. The magnetic field was then reversed to a value near the coercive field, and the Kerr rotation was measured as a function of time after reversal. We interpret our results in terms of the model of domain reversal first described by Fatuzzo for ferroelectrics. For some Fe thicknesses, we found that the reversal process …

Development Of The Gd(0001) Band Structure With Film Thickness, Dongqi Li, W. Hutchings, Peter A. Dowben, Rong-Tzong Wu, C. Hwang, M. Onellion, A.B. Andrews, J.L. Erskine

Peter Dowben Publications

By growing gadolinium films on W(110), it has been possible to observe the development of the Gd(0001) band structure with increasing film thickness. The changes in the 5d bands as a result of exposure to oxygen or the development of the valence-band structure with increasing film thickness lead to changes in the 5p multiplet oscillator strengths. These changes are a result of the influence of the band structure upon the final-state effects that give rise to such multiplet structures. This study provides conclusive evidence that there is a 5d contribution to the shallow 5p multiplet photoemission …

Fabricating Magnetic Co-Ni-C Thin-Film Alloys By Organometallic Chemical Vapor Deposition, Yoon-Gi Kim, Dongjin Byun, C. Hutchings, Peter A. Dowben, H. Hejase, K. Schröder

Peter Dowben Publications

We have deposited Co_xNi_y^-C films with a variety of compositions to verify dependence of the saturation magnetization on the composition. These experiments suggest that we can produce Co_xNi_y^-C films with a variety of magnetic properties. The Co_xNi_y^-C films were fabricated by ultraviolet decomposition of cobaltocene and nickelocene. We demonstrated that the photolytic decomposition of these metallocenes produces cyclopentadienyl (C₅H₅) species, consistent with recent studies of the energetics of the ligand metal bonds.

Temperature And Thickness Dependence Of Coercivity And Magnetization Of Co/Cu And Co/Si Multilayers, S. Nafis, John A. Woollam, Z.S. Shan, David J. Sellmyer

David Sellmyer Publications

Co/Cu and Co/Si multilayers of total thickness ~3000 Å were prepared by rf and dc magnetron sputtering. The nominal thicknesses of the individual layers were in the range of 4 to 100 Å. A large coercivity (H_c) at 10 K was observed for very thin layers of Co in Co/Cu samples, and it decreased with increase of the Co layer thickness. For very thin layers of Co in Co/Cu samples, the layer behaved superparamagnetically. Similar behavior was not to be observed in Co/Si samples. With increased substrate temperature (T_s) during deposition, H_c was …

The Process-Controlled Magnetic Properties Of Nanostructured Co/Ag Composite Films, Sy_Hwang Liou, S. Malhotra, Z.S. Shan, David J. Sellmyer, S. Nafis, John A. Woollam, C.P. Reed, R.J. Deangelis, G.M. Chow

Sy-Hwang Liou Publications

Nanostructured Co/Ag composite films were prepared by magnetron sputtering using a single target. The average crystallite sizes of Co and Ag in the films depend on the deposition conditions. As the substrate temperature increases from 100 °C to 600 °C, the average Ag crystallite size increases from 39 to 452 Å, and the average Co crystallite size increases from Å in the film with 39 vol. % of Co. The films with 39 vol. % of Co and prepared at 400 °C substrate temperature showed a maximum magnetic coercivity of 565 Oe at 6 K. We have studied the correlation …

Temperature And Layer-Thickness Dependencies Of Kerr Rotation In Dy/Co Multilayers, Z.S. Shan, J.X. Shen, Roger D. Kirby, Sy_Hwang Liou, David J. Sellmyer

Sy-Hwang Liou Publications

Amorphous Dy/Co multilayers with the individual layer thickness between 4 and 10 Å in steps of 0.5 to 1 Å were studied systematically over the temperature range 100–300 K. The Kerr rotation increases as temperature decreases, or as Co content increases and the coercivity increases both in the low temperature region and in the vicinity of the compensation point. These characteristics were analyzed in terms of simple models of the magnetic structure and magnetization reversal.

Sputtering Pressure Effect On Microstructure Of Surface And Interface, And On Coercivity Of Co/Pt Multilayers, Ping He, William A. Mcgahan, S. Nafis, John A. Woollam, Z.S. Shan, Sy_Hwang Liou, F. Sequeda, T. Mcdaniel, H. Do

Sy-Hwang Liou Publications

Thin Co/Pt multilayers were prepared on Si and glass substrates by sputtering with Ar pressures ranging from 2.5 to 15 mTorr. The bilayer structure of the samples was Co(3 Å)/Pt(15 Å)×17, and all samples had the easy axis of magnetization perpendicular to the sample surface as determined with a SQUID magnetometer. All samples retained the layered structure, as revealed by low-angle x-ray diffraction. In addition, diffraction peaks due to the formation of Co-Pt compounds (presumably at the interfaces between Co and Pt) were identified. The coercivity of samples changed from about 400 Oe for films deposited at low Ar sputtering …

The Probe, Issue 116 - November 1991

The Probe: Newsletter of the National Animal Damage Control Association

THE PROBE
National Animal Damage Control Association
NOVEMBER 1991
ADC Continues With EIS Process
Calendar of Upcoming Events
NADC Advisory Committee Appointments Announced
Animal Damage Control in the News
Michigan Woman, 62, Fends Off Bear
Recipes Distributed as Remedy for Brown Tree Snake Problem
Caribbean Countries Request Assistance From DWRC
NRA Creates New Wildlife Management Department
WFLA Reports Raid on Wildlife Research Project
Nominations for NADCA For 1992-1993
Where Your NADCA Dues Go...
Co-Editor Schmidt Moves To Utah
Letter to Inside APHIS Draws Fire From Virginia Wildlife Biologist
NADCA Logo Contest Still On!

Cottontail Rabbit: Eastern Cottontail (Sylvilagus Floridanis)

Nebraska Game and Parks Commission: Publications

Cottontail Rabbit:
Description
Distribution and Range
Habitat and Home
Habits
Foods
Reproduction
Mortality
Importance
Management

Pyro-Electro-Optic Phase Gratings, Stephen Ducharme

Stephen Ducharme Publications

A new physical mechanism is proposed for generating transient phase gratings in transparent pyroelectric materials. The mechanism combines the pyroelectric and electro-optic effects to convert spatial intensity variations into transient phase gratings. The grating diffraction efficiency increases with a figure of merit that is proportional to the pyroelectric, electro-optic, and absorption coefficients and is inversely proportional to the specific heat. The grating response time is proportional to the specific heat and inversely proportional to the thermal conductivity. Diffraction efficiencies that approach unity are predicted in several readily available electro-optic materials with modest pulse energies from Q-switched Nd:YAG lasers. Observation …

The Behlen Observatory Variable Star Survey: First Results, Edward G. Schmidt

Edward Schmidt Publications

Various light curve parameters are presented for the first 93 objects in a photometric survey of poorly studied variable stars. Stars from the General Catalogue of Variable Stars (GCVS) fainter than tenth magnitude, north of the equator which were classified as pulsating variables (but excluding the long period, semiregular, and irregular variables) were included. It is shown that two parameters, the acuteness and the rise time, are useful for characterizing the light curves. Several criteria are applied to the photometric data to test the classification of the stars. For 26 stars new or improved classifications are suggested. In particular, there …

Fox Squirrel (Scuirus Niger)

Nebraska Game and Parks Commission: Publications

Fox squirrel:
Description
Distribution and Abundance
Habitat and Home
Habits
Food
Reproduction
Mortality
Importance
Management

The Probe, Issue 115 - October 1991

The Probe: Newsletter of the National Animal Damage Control Association

THE PROBE
National Animal Damage Control Association
OCTOBER 1991
The Private Sector's Role in ADC
Calendar of Upcoming Events
Animal Damage Control in the News:
A Different Kind of Dog Problem in China
Federal Authorities Raid State Agricultural Lab
Blackbirds and Starlings Invade Butte County, California
Slogan Causes Problems for South Carolina Wildlife Department
Hogs Damage Crops in Texas
NRA Institutes Wildlife Management Department
NADCA Nominations Announced for 1992-93
NADCA Logo Contest Still On!
Letter to the Editor

Conference Summary And A Look To The Future, James E. Miller

Fifth Eastern Wildlife Damage Control Conference (1991)

It is with mixed feelings that I agreed, somewhat reluctantly, to accept this challenge of trying to summarize the implications of this Fifth Eastern Wildlife Damage Control Conference. Even though it has been over 8 years ago, I still remember burning the midnight oil and working in the predawn hours on the last eve of the First Eastern Conference trying to prepare closing remarks for use by my former Deputy Administrator, Merrill L. "Pete" Petoskey. In fact, even though some of the guard has changed, at least one of the professionals who helped provide their insight as we prepared those …

Conference Participants

Fifth Eastern Wildlife Damage Control Conference (1991)

Participants

Wildlife Damage News, Volume 2, Fall 1991

Wildlife Damage News

CONTENTS:
Cornell University Attacks Raccoon Rabies in Ithaca
5th Eastern Wildlife Damage Control Conference
Citizen Task Force Slated for Great Rochester Area
Animal Rights or Animal Welfare
Species Profile - Eastern Cottontail
Time for Newsletter Subscription Renewal
Department of Natural Resources Initiates
Master Forest Owners Program
New Urban Wildlife Newsletter Available
Current literature
The Professional Organization
NRA Forms Wildlife Management Department

Reply To "Comment On 'Kinetic-Energy Density Functional For A Special Shape-Invariant Potential Of A One-Dimensional Two-Level System'", Jiushu Shao, John J. Stezowski

John J. Stezowski Publications

For a harmonic potential, which is the special shape-invariant potential discussed in our paper [1], the relation between the ground state and the first-excited-state wave functions [Eq. (2)] should be . . .

Therefore, we have shown that one cannot find a closed form of the kinetic-energy density for the harmonic oscillator.

Track Physics Model Of Radiation Effects, Robert Katz

Robert Katz Publications

Radiation effects induced by heavy ions in many materials with diverse end points are well described by the conceptual structure and equations of track physics, first developed for heavy ion tracks in nuclear emulsions. The model describes scintillators, biological cell inactivation and mutation, radiation chemistry, latent tracks in insulators, the response of resists to heavy ions, and other systems. A detector is taken to be composed of small targets whose response to ionizing radiation is principally to secondary electrons. The response is calibrated through determination of the probability of target (in)activation as a function of the absorbed dose of γ …

Water Current, Volume 23, September 1991

Water Current Newsletter

Water Leadership in Nebraska: Vacuum or Variety?
News to Use
From the Director: Water Sciences Education Advancing at UNL
The Framework Study: A 20-Year Retrospective
Nebraska and Its Water
Sheffield Receives Recognition for 20 Irrigation Tours