Digital Commons Network^™

Executive Committee - Agenda, 4/15/1997, Academic Senate

Academic Senate Agendas

No abstract provided.

Solar Wind-Magnetosphere Coupling During An Isolated Substorm Event: A Multispacecraft Istp Study, T I. Pulkkinen, D N. Baker, Niescja E. Turner, H J. Singer, L A. Frank, J B. Sigwarth, J Scudder, R Anderson, S Kokubun, R Nakamura, T Mukai, J B. Blake, C T. Russell, H Kawano, F Mozer, J A. Slavin

Physics and Astronomy Faculty Research

Multispacecraft data from the upstream solar wind, polar cusp, and inner magnetotail are used to show that the polar ionosphere responds within a few minutes to a southward IMF turning, whereas the inner tail signatures are visible within ten min from the southward turning. Comparison of two subsequent substorm onsets, one during southward and the other during northward IMF, demonstrates the dependence of the expansion phase characteristics on the external driving conditions. Both onsets are shown to have initiated in the midtail, with signatures in the inner tail and auroral oval following a few minutes later.

The Parthenon, April 15, 1997, Marshall University

The Parthenon

No abstract provided.

Magnetic And Structural Properties Of Nd₂Fe₁₇₋ₓmnₓ Solid Solutions, Peter C. Ezekwenna, G. K. Marasinghe, William Joseph James, Oran Allan Pringle, Gary J. Long, H. Luo, Z. Hu, William B. Yelon, Ph. I'Héritier

Chemistry Faculty Research & Creative Works

A series of Nd₂Fe_17-xMn_x solid solutions with x values between 0 and and 6 were prepared and analyzed using magnetic measurements, neutron diffraction, and Mössbauer spectroscopy. All of the Nd₂Fe_17-xMn_x samples crystallized in the Th₂Zn_17-x-type rhombohedral structure. The lattice parameters and unit cell volumes decrease with increasing manganese content up to ∼ x equal to 2, and then increase for higher manganese content. The magnetizations of Nd₂Fe_17-xMn_x decrease with increasing manganese content and Nd₂Fe_17-xMn_x is paramagnetic …

An Analysis Of Iron-Iron Interatomic Distances In Several Rare Earth Transition Metal Intermetallics, G. K. Marasinghe, Peter C. Ezekwenna, William Joseph James, Z. Hu, William B. Yelon

Chemistry Faculty Research & Creative Works

As a part of a systematic study of the dependence of iron-iron exchange interactions on near neighbor iron-iron distances in rare earth transition metal magnetic materials, we have conducted a statistical analysis of interatomic distances in Nd₂Fe₁₇, Nd₂Fe₁₇N₃, and Nd₂Fe₁₄B. Results, in general, support the notion that larger near neighbor iron-iron distances promote higher Curie temperatures. In this work, special attention has been paid to the expansion of the Nd₂Fe₁₇ lattice due to interstitial nitrogenation and the accompanying increase in the Curie temperature. …

Nathan Mueggenburg Of Godfrey, Ill. Goldwater Scholarship Awarded To Illinois Wesleyan, Bob Aaron

News and Events (Discontinued Series)

No abstract provided.

Studies Of V, Nb, Cr, And Zr Substituted 2:17 Compounds And Their Carbides Using Neutron Diffraction, H. Luo, Z. Hu, Muguo Chen, William B. Yelon, G. K. Marasinghe, Peter C. Ezekwenna, William Joseph James, W. C. Chang, S. H. Tsai

Physics Faculty Research & Creative Works

Samples of Nd₂Fe_17-xT_xC_y with T=V, Nb, Cr, and Zr were prepared by melting of the constituent elements including C and studied by neutron diffraction. Comparing with their uncarbided counterparts, we found that the substituents transfer, more or less, from the 6c site to the 18f and 18h sites with the introduction of C atoms. This behavior appears to relate to the electronegativities between the C atoms and the early transition series elements because the 18f and 18h sites are near neighbors of the interstitial C site. However, the C effects in the V. …

Enhanced Temperature Effect On Magnetoresistance In Fe/Mo Multilayers, M.L. Yan, Y.W. Lai, L. Yin, Sy_Hwang Liou

Sy-Hwang Liou Publications

We have observed an enhancement of the temperature effect on magnetoresistance (MR) in Fe/Mo multilayers with the increase of the Mo layer thickness. MR at the first antiferromagnetic maximum is large and insensitive to the temperature whereas at the third antiferromagnetic maximum it is small and relatively sensitive to the temperature. We found that the mean free path of the conduction electrons increased with the increase of the Mo layer thickness at a fixed temperature and it decreased very slightly with the increase of the temperature at a fixed Mo layer thickness. The interlayer coupling, similar to MR, also has …

Domain-Wall Curvature And Coercivity In Pinning Type Sm–Co Magnets, Ralph Skomski

Ralph Skomski Publications

The origin of coercivity in precipitation hardened Sm–Co magnets is investigated. By considering domain-wall pinning at boundary phase and Z phase inhomogenities, it is found that the hexagonal Z phase has no direct influence on the coercivity. The intuitive assumption of plane domain walls made in a recent calculation is unrealistic but has no direct effect on the coercivity. However, due to the comparatively large size of the 12:17 cells, the calculated three dimensional domain-wall curvature is sufficiently large to assure a nearly ideal nestling of the domain walls to the 1:5 cell boundary. This nestling yields a coercivity increase …

Magnetism And Morphology Of Fe/Cu(111) Films Below Two-Dimensional Percolation, J. Shen, Ralph Skomski, M. Klaua, H. Jenniches, S. Sundar Manoharan, J. Kirschner

Ralph Skomski Publications

The magnetic properties of g-iron films on Cu(111) below the two-dimensional percolation threshold of about 1.4 monolayer are investigated. Iron on flat Cu(111) surfaces forms triangular patches, while it forms stripes along step edges on vicinal surfaces. The films exhibit an easy magnetization axis perpendicular to the film plane and magnetic hysteresis at sufficiently low temperatures. The magnetization curves of the triangular iron patches are discussed in terms of Ising superparamagnetism. From Kerr hysteresis loops, we deduce that the first anisotropy constant K₁ in the superparamagnetic films is of order 0.345±0.020 MJ/m³.

Superparamagnetic Ultrathin Films, Ralph Skomski, D. Sander, J. Shen, J. Kirschner

Ralph Skomski Publications

The finite-temperature magnetism of ultrathin films such as sesquilayer Fe/W(110) and submonolayer Fe/Cu(111) is investigated. Based on renormalizations of Onsager's exact solution of the two-dimensional Ising model it is shown that superparamagnetism is a common phenomenon in imperfect ultrathin films. The ultimate reason for this behavior is the existence of two structural length scales: the lattice constant, usually considered in renormalization-group theory, and the characteristic size of the film inhomogeneities.

Optical And Magneto-Optical Properties Of Mnpt3 Films (Abstract), Kurt W. Wierman, J. N. Hilfiker, Renat F. Sabiryanov, Sitaram Jaswal, Roger D. Kirby, John A. Woollam

Roger Kirby Publications

Optically thick films of MnPt₃ were prepared by magnetron sputtering onto quartz substrates. Postdeposition annealing at 850 °C resulted in highly textured (111) films with the L1₂ (Cu₃Au) structure. MnPt₃ films are ferromagnetic with a Curie temperature of 380 °C, and they show large magneto-optical effects in the visible. These films also show a high degree of long-range order. The diagonal components of the dielectric tensor were determined using variable angle spectroscopic ellipsometry measurements over the spectral range 1.2–2.4 eV. Magneto-optic Kerr rotation and ellipticity measurements were made at near normal incidence over the …

Interlayer Coupling In Nife/Mo Multilayers And Effect Of Fe Underlayer, M.L. Yan, Z.S. Shan, David J. Sellmyer, W.Y. Lai

David Sellmyer Publications

We report our studies of exchange coupling in NiFe/Mo multilayers with and without Fe underlayer. The interlayer coupling of NiFe layers across the Mo spacer as well as the magnetic exchange coupling between Fe underlayer and the NiFe/Mo multilayers were observed: The interlayer coupling in NiFe/Mo multilayers exhibits the typical oscillations as a function of the Mo spacer with a period of about 11 Å, and the magnetic exchange coupling between Fe underlayer and the NiFe/Mo multilayers is strongly dependent on the thickness of the Mo spacer t_Mo and the bilayer number N of NiFe/Mo multilayers. For the [NiFe(20 …

Magnetic Properties And Switching Volumes Of Nanocrystalline Smfesic Films, S.Y. Zhang, Z.S. Shan, Yi Liu, T.Y. Zhao, J.G. Zhao, B.G. Shen, W.S. Zhan, David J. Sellmyer

David Sellmyer Publications

Systematic studies of the effects of Si addition on the magnetic and magnetization reversal properties of SmFeSiC films are presented. The magnetic switching volume and other magnetic parameters (e.g., coercivity) are strongly dependent upon the Si content. Correlations between switching volume, coercivity, and the intergrain interactions are discussed.

April 14, 1997 Reporter, University Of Alabama At Birmingham

eReporter (campus newsletter)

No abstract provided.

A Survey Of Selected Southern New Jersey School Districts To Determine Effects On Special Education Of Policy Changes Proposed In August 1996, Heidi Roman Chausse

Theses and Dissertations

Twenty-three of thirty districts surveyed respond to questions addressing the implications of proposed amendments to NJAC 6:28, presented by Dr. Klagholz in August 1996. Statistical data was obtained regarding district size and special education populations. Responses investigated areas of Child Study Team, classification, programs, P2R, curriculum and assessment, case management and outside agency licensure The results were tabulated and significant findings were evident.

The most provocative findings show uncertainty on the part of the districts as to the effects of these proposed changes on special education. The respondents indicate concerns that these changes will lead to increased litigation and a …

Monitor Newsletter April 14, 1997, Bowling Green State University

Monitor

Official Publication of Bowling Green State University for Faculty and Staff

A Comparison Of Strategy Instruction And Sequential Instruction Of Verbal Math Problems, Eva L. Surowicz

Theses and Dissertations

This research study was conducted to test the effectiveness of strategy instruction and sequencing practice problems in teaching fourth grade students to identify the correct algorithm for solving one-step multiplication and division problems. Forty-eight students were assigned to one of three experimental groups: strategy-plus-sequence, strategy only, or sequence only. The results indicated that students in the strategy only group and the strategy-plus-sequence group scored significantly higher than did students in the sequence only group. Findings indicated that strategy teaching was more effective than sequencing problem type. Implications for instructional design are discussed.

Does Student Adherence To An Aptitude-Achievement Discrepancy Formula Exclude Students Who Are Truly In Need Of Special Education Services?, Lisa R. Vizthum

Theses and Dissertations

The purpose of this study was to review current practices of Child Study Teams when classifying a student as perceptually impaired in order to determine if children are being misclassified, and also to determine if strict guidelines will really lower the numbers of children being classified as perceptually impaired. A second purpose was to survey districts as to what programs they currently have in place in order to discourage students from dropping out of high school.

A survey/questionnaire was sent to 22 Directors of Special Services in a given county. A total of 12 districts responded, representing a participation rate …

University Of Northern Iowa Faculty Senate Meeting Minutes, April 14, 1997, University Of Northern Iowa. Faculty Senate.

Documents - Faculty Senate

Meeting minutes from the Faculty Senate of the University of Northern Iowa.

Ua1b1 Student Awards Ceremony, Western Kentucky University

WKU Administration Documents

Program recognizing WKU student award winners.

From Europe, With Love: University Choir And Schola Cantorum, Department Of Music, University Of Richmond

Music Department Concert Programs

No abstract provided.

Harmonic Oscillation In The Presence Of Multiple Damping Forces, Chris Pelto, Keith Coates, Faculty Advisor, Narendra Jaggi, Faculty Advisor

John Wesley Powell Student Research Conference

No abstract provided.

Steiner Trees Over Generalized Checkerboards, Meta Voelker, Robin Sanders, Faculty Advisor

John Wesley Powell Student Research Conference

No abstract provided.

Adapting Daubechies' Wavelet Iteration Scheme To Biorthogonal Scaling Functions, Nathan Mueggenburg, Tian-Xiao He, Faculty Advisor

John Wesley Powell Student Research Conference

No abstract provided.

Mapping Robotic Movement To A Three-Dimensional Coordinate System, Craig A. Materick, Lon Shapiro, Faculty Advisor

John Wesley Powell Student Research Conference

No abstract provided.

Complete 1997 Program

John Wesley Powell Student Research Conference

No abstract provided.

Doc Severinsen And His Big Band, Center For Performing Arts

Center for Performing Arts Memorabilia

Playbill insert for the April 11, 1997 performance by Doc Severinsen and His Big Band Orchestra.

Fifth Annual Student Research And Creative Activities Symposium - April 11, 1997, Symposium Steering Committee

Student Research and Creative Activities Symposium 1993-2018

Participants - College of Arts and Sciences, College of Business and Management, College of Education, Graduate College, University Honors Program

"The Crescent" Student Newspaper, April 11, 1997, George Fox University Archives

"The Crescent" Student Newspaper

Student Newspaper of George Fox University.