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Articles 1  30 of 10260
FullText Articles in Physical Sciences and Mathematics
Kodysynth, Ryan Kody
Kodysynth, Ryan Kody
Honors Research Projects
KodySynth is a VST digital synthesizer that can be loaded into any digital audio workstation such as FL Studio, Ableton, or Garageband. The program was made using the JUCE library which helped with streamlining the process and making it easier to create clean and intuitive looking graphics. The project also needs the Maximilian Library of sounds to create the sound waves that listeners will hear when playing the synthesizer. Users will also be able to plug in a MIDI keyboard to play KodySynth. The functionalities include a choice of 5 oscillator wave types, as well as an attack, decay, sustain ...
Low Rank Perturbations Of Quaternion Matrices, Christian Mehl, Andre C.M. Ran
Low Rank Perturbations Of Quaternion Matrices, Christian Mehl, Andre C.M. Ran
Electronic Journal of Linear Algebra
Low rank perturbations of right eigenvalues of quaternion matrices are considered. For real and complex matrices it is well known that under a generic rank$k$ perturbation the $k$ largest Jordan blocks of a given eigenvalue will disappear while additional smaller Jordan blocks will remain. In this paper, it is shown that the same is true for real eigenvalues of quaternion matrices, but for complex nonreal eigenvalues the situation is different: not only the largest $k$, but the largest $2k$ Jordan blocks of a given eigenvalue will disappear under generic quaternion perturbations of rank $k$. Special emphasis is also given ...
From Convergence In Measure To Convergence Of MatrixSequences Through Concave Functions And Singular Values, Giovanni Barbarino, Carlo Garoni
From Convergence In Measure To Convergence Of MatrixSequences Through Concave Functions And Singular Values, Giovanni Barbarino, Carlo Garoni
Electronic Journal of Linear Algebra
Sequences of matrices with increasing size naturally arise in several areas of science, such as, for example, the numerical discretization of differential and integral equations. An approximation theory for sequences of this kind has recently been developed, with the aim of providing tools for computing their asymptotic singular value and eigenvalue distributions. The cornerstone of this theory is the notion of approximating classes of sequences (a.c.s.), which is also fundamental to the theory of generalized locally Toeplitz (GLT) sequences, and hence to the spectral analysis of PDE discretization matrices. Drawing inspiration from measure theory, here it is introduced ...
The General $\Phi$Hermitian Solution To Mixed Pairs Of Quaternion Matrix Sylvester Equations, ZhuoHeng He, Jianzhen Liu, TinYau Tam
The General $\Phi$Hermitian Solution To Mixed Pairs Of Quaternion Matrix Sylvester Equations, ZhuoHeng He, Jianzhen Liu, TinYau Tam
Electronic Journal of Linear Algebra
Let $\mathbb{H}^{m\times n}$ be the space of $m\times n$ matrices over $\mathbb{H}$, where $\mathbb{H}$ is the real quaternion algebra. Let $A_{\phi}$ be the $n\times m$ matrix obtained by applying $\phi$ entrywise to the transposed matrix $A^{T}$, where $A\in\mathbb{H}^{m\times n}$ and $\phi$ is a nonstandard involution of $\mathbb{H}$. In this paper, some properties of the MoorePenrose inverse of the quaternion matrix $A_{\phi}$ are given. Two systems of mixed pairs of quaternion matrix Sylvester equations $A_{1}XYB_{1}=C_{1},~A_{2}ZYB_{2}=C_ ...
GazeContingent Displays For Interactive Text Enhancement, Divya Bajaj
GazeContingent Displays For Interactive Text Enhancement, Divya Bajaj
Graduate Masters Theses
Eye trackers are used for measuring a person’s eye movements, for example, while reading text on a screen. This information can be used by scientists to study the human visual system during object recognition or text comprehension. Moreover, engineers can build gazecontrolled interfaces that trigger a variety of actions when the user looks at prespecified icons on a screen. In my research, I studied how gazecontingent displays can be used to enhance the information that is provided by texts. First, I implemented a simple scripting language that allows even users without programming experience to set up gazecontingent text displays ...
Looping Predictive Method To Improve Accuracy Of A Machine Learning Model, Subramanyam Reddy Pogili
Looping Predictive Method To Improve Accuracy Of A Machine Learning Model, Subramanyam Reddy Pogili
Theses
The topic of this project is an analysis of drugrelated tweets. The goal is to build a Machine Learning Model that can distinguish between tweets that indicate drug abuse and other tweets that also contain the name of a drug but do not descri
Electrical Properties Of Metal Semiconductor Contacts  Metals On Mos2: A Case Study, Xiao Chang
Electrical Properties Of Metal Semiconductor Contacts  Metals On Mos2: A Case Study, Xiao Chang
Theses
Properties of monolayer semiconductor, MoS2, are presented in the research. Schottky barrier height and SchottkyMott rules are discussed. The currentvoltage measurement and capacitancevoltage measurement are analyzed considering the role of the work
Characteristics Of Different Deep Neural Networks And Application Of PreTrained Model Without Transfer Learning, Zhiqi Peng
Theses
Deep neural networks have been successful in many areas, some of them even surpass human performances. The goal of this thesis is using data simulations to present different characteristics of three deep neural networks: fully connected deep neural net
Obat Aborsi Cytotec Asli Wa 085875427775, Nia Diana
Obat Aborsi Cytotec Asli Wa 085875427775, Nia Diana
nia diana
Semantic Hierarchies For Extracting, Modeling, And Connecting Compliance Requirements In Information Security Control Standards, Matthew L. Hale, Rose F. Gamble
Semantic Hierarchies For Extracting, Modeling, And Connecting Compliance Requirements In Information Security Control Standards, Matthew L. Hale, Rose F. Gamble
Interdisciplinary Informatics Faculty Publications
Companies and government organizations are increasingly compelled, if not required by law, to ensure that their information systems will comply with various federal and industry regulatory standards, such as the NIST Special Publication on Security Controls for Federal Information Systems (NIST SP80053), or the Common Criteria (ISO 154082). Such organizations operate business or mission critical systems where a lack of or lapse in security protections translates to serious confidentiality, integrity, and availability risks that, if exploited, could result in information disclosure, loss of money, or, at worst, loss of life. To mitigate these risks and ensure that their information systems ...
Simulations For Designing And Interpreting Intervention Trials In Infectious Diseases., M Elizabeth Halloran, Kari Auranen, Sarah Baird, Nicole E Basta, Steven E Bellan, +Several Additional Authors
Simulations For Designing And Interpreting Intervention Trials In Infectious Diseases., M Elizabeth Halloran, Kari Auranen, Sarah Baird, Nicole E Basta, Steven E Bellan, +Several Additional Authors
Global Health Faculty Publications
BACKGROUND: Interventions in infectious diseases can have both direct effects on individuals who receive the intervention as well as indirect effects in the population. In addition, intervention combinations can have complex interactions at the population level, which are often difficult to adequately assess with standard study designs and analytical methods.
DISCUSSION: Herein, we urge the adoption of a new paradigm for the design and interpretation of intervention trials in infectious diseases, particularly with regard to emerging infectious diseases, one that more accurately reflects the dynamics of the transmission process. In an increasingly complex world, simulations can explicitly represent transmission dynamics ...
"The Devil Is In The Details:" Inland Northwest Stakeholders’ Views On Three ForestBased Bioenergy Scenarios, Soren Newman, Darin Saul, Robert Keefe, Ryan Jacobson, Tamara Laninga, Jillian Moroney
"The Devil Is In The Details:" Inland Northwest Stakeholders’ Views On Three ForestBased Bioenergy Scenarios, Soren Newman, Darin Saul, Robert Keefe, Ryan Jacobson, Tamara Laninga, Jillian Moroney
University Author Recognition Bibliography: 2017
Public and private initiatives are actively exploring a range of forestbased bioenergy development options in the Inland Northwest of the United States. These efforts are motivated in part by the potential to generate renewable energy while creating a market for forest residues that would facilitate hazardous fuels reduction and provide economic opportunities. Understanding stakeholders’ perspectives is critical to the feasibility and longterm viability of bioenergy projects. This study presents stakeholder perspectives on forestbased bioenergy development strategies for communities in the forested areas of Idaho, western Montana, eastern Washington, and eastern Oregon. We developed three scenarios based on bioenergy initiatives currently ...
Measurement Of The Helicity Asymmetry E In Ω → Π^{+}Π^{−}Π^{0} Photoproduction, Z. Akbar, P. Roy, S. Park, V. Crede, A. V. Anisovich, I. Denisenko, E. Klempt, V. A. Nikonov, A. V. Sarantsev, K. P. Adhikari, S. Adhikari, M. J. Amaryan, S. Anefalos Pereira, H. Avakian, J. Ball, M. Battaglieri, V. Batourine, I. Bedlinskiy, S. Boiarinov, W. J. Briscoe, J. Brock, W. K. Brooks, V. D. Burkert, F. T. Cao, C. Carlin, D. S. Carman, A. Celentano, G. Charles, T. Chetry, G. Ciullo, Wesley P. Gohn
Measurement Of The Helicity Asymmetry E In Ω → Π+Π−Π0 Photoproduction, Z. Akbar, P. Roy, S. Park, V. Crede, A. V. Anisovich, I. Denisenko, E. Klempt, V. A. Nikonov, A. V. Sarantsev, K. P. Adhikari, S. Adhikari, M. J. Amaryan, S. Anefalos Pereira, H. Avakian, J. Ball, M. Battaglieri, V. Batourine, I. Bedlinskiy, S. Boiarinov, W. J. Briscoe, J. Brock, W. K. Brooks, V. D. Burkert, F. T. Cao, C. Carlin, D. S. Carman, A. Celentano, G. Charles, T. Chetry, G. Ciullo, Wesley P. Gohn
Physics and Astronomy Faculty Publications
The doublepolarization observable E was studied for the reaction γp → pω using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Accelerator Facility and the longitudinally polarized frozenspin target (FROST). The observable was measured from the charged decay mode of the meson, ω → π^{+}π^{−}π^{0}, using a circularly polarized taggedphoton beam with energies ranging from the ω threshold at 1.1 to 2.3 GeV. A partialwave analysis within the BonnGatchina framework found dominant contributions from the 3/2^{+} partial wave near threshold, which is identified with the subthreshold N(1720)3/2 ...
Magnetocrystalline Anisotropy Of "Fe2o3, Imran Ahamed, Rohilt Pathak, Arti Kashyap
Magnetocrystalline Anisotropy Of "Fe2o3, Imran Ahamed, Rohilt Pathak, Arti Kashyap
Faculty Publications from Nebraska Center for Materials and Nanoscience
The epsilon Fe_{2}O_{3} phase of iron oxide has been studied to understand the spin structure and the magnetocrystalline anisotropy in the bulk and in thin films of "Fe_{2}O_{3} and Codoped "Fe_{2}O_{3}. The preferential magnetization direction in the nanoparticles of "Fe_{2}O_{3 }is along the aaxis [M. Gich et al., Chem. Mater. 18, 3889 (2006)]. Compared to the bulk band gap of 1.9 eV, the thinfilm band gap is reduced to 1.3 eV in the Cofree films and to 0.7 eV in the film with partial ...
First NarrowBand Search For Continuous Gravitational Waves From Known Pulsars In Advanced Detector Data, B. P. Abbott, K. Aultoneal, S. Gaudio, K. Gill, E. M. Gretarsson, B. Hughey, M. Muratore, J. W. W. Pratt, S. G. Schwalbe, K. Staats, M. J. Szczepańczyk, M. Zanolin, Et Al.
First NarrowBand Search For Continuous Gravitational Waves From Known Pulsars In Advanced Detector Data, B. P. Abbott, K. Aultoneal, S. Gaudio, K. Gill, E. M. Gretarsson, B. Hughey, M. Muratore, J. W. W. Pratt, S. G. Schwalbe, K. Staats, M. J. Szczepańczyk, M. Zanolin, Et Al.
Publications
Spinning neutron stars asymmetric with respect to their rotation axis are potential sources of continuous gravitational waves for groundbased interferometric detectors. In the case of known pulsars a fully coherent search, based on matched filtering, which uses the position and rotational parameters obtained from electromagnetic observations, can be carried out. Matched filtering maximizes the signaltonoise (SNR) ratio, but a large sensitivity loss is expected in case of even a very small mismatch between the assumed and the true signal parameters. For this reason, narrowband analysis methods have been developed, allowing a fully coherent search for gravitational waves from known pulsars ...
Black Hole Hyperaccretion InflowOutflow Model. I. Long And UltraLong GammaRay Bursts, Tong Liu, CuiYing Song, Bing Zhang, WeiMin Gu, Alexander Heger
Black Hole Hyperaccretion InflowOutflow Model. I. Long And UltraLong GammaRay Bursts, Tong Liu, CuiYing Song, Bing Zhang, WeiMin Gu, Alexander Heger
Physics & Astronomy Faculty Publications
Longduration gammaray bursts (LGRBs) and ultraLGRBs (ULGRBs) originate from collapsars, in the center of which a newborn rotating stellarmass black hole (BH) surrounded by a massive accretion disk may form. In the scenario of the BH hyperaccretion inflowoutflow model and BlandfordZnajek (BZ) mechanism to trigger gammaray bursts (GRBs), the real accretion rate to power a BZ jet is far lower than the mass supply rate from the progenitor star. The characteristics of the progenitor stars can be constrained by GRB luminosity observations, and the results exceed usual expectations. LGRBs lasting from several seconds to tens of seconds in the rest ...
Lights Out! On Cartesian Products, Travis Peters, John Goldwasser, Michael Young
Lights Out! On Cartesian Products, Travis Peters, John Goldwasser, Michael Young
Electronic Journal of Linear Algebra
The game LIGHTS OUT! is played on a 5 by 5 square grid of buttons; each button may be on or off. Pressing a button changes the on/o state of the light of the button pressed and of all its vertical and horizontal neighbors. Given an initial configuration of buttons that are on, the object of the game is to turn all the lights out. The game can be generalized to arbitrary graphs. In this paper, Cartesian Product graphs (that is, graphs of the form G\box H, where G and H are arbitrary finite, simple graphs) are investigated ...
Learning About Modeling In Teacher Preparation Programs, Hyunyi Jung, Eryn Stehr, Jia He, Sharon L. Senk
Learning About Modeling In Teacher Preparation Programs, Hyunyi Jung, Eryn Stehr, Jia He, Sharon L. Senk
Hyunyi Jung
This study explores opportunities that secondary mathematics teacher preparation programs provide to learn about modeling in algebra. Fortyeight course instructors and ten focus groups at five universities were interviewed to answer questions related to modeling. With the analysis of the interview transcripts and related course materials, we found few opportunities for PSTs to engage with the full modeling cycle. Examples of opportunities to learn about algebraic modeling and the participants’ perspectives on the opportunities can contribute to the study of modeling and algebra in teacher education.
Supporting Preservice Teachers’ Use Of Connections And Technology In Algebra Teaching And Learning, Eryn Stehr, Hyunyi Jung, Jill Newton, Sharon L. Senk
Supporting Preservice Teachers’ Use Of Connections And Technology In Algebra Teaching And Learning, Eryn Stehr, Hyunyi Jung, Jill Newton, Sharon L. Senk
Hyunyi Jung
Secondary mathematics teacher education programs across the United States opportunities for preservice teachers to make connections and encounter technology to varying degrees, despite recommendations from the Conference Board of the Mathematical Sciences. We explore the research question: What opportunities do secondary mathematics teacher preparation programs provide for preservice teachers to learn about connections and to encounter technologies in learning algebra and learning to teach algebra? We present patterns and examples of a wide range of opportunities that instructors provided related to algebraic connections and use of technology, based on data collected from five teacher education programs across the U.S.
Models And Modeling, Corey Brady, Hyunyi Jung, Cheryl Eames
Models And Modeling, Corey Brady, Hyunyi Jung, Cheryl Eames
Hyunyi Jung
Modeling has recently received much attention as the Common Core State Standards have included it as one of eight core mathematical practices. The Models and Modeling Working Group builds on a long history of collaboration among researchers studying models and modeling. This year’s session will focus on building capacity within the broad community of researchers who are interested in theoretical and practical perspectives related to models and modeling. We will begin by engaging with a modeling activity and some closely related materials. This experience will serve to ground our discussions and provide a concrete common reference for participants. We ...
Mathematical Knowledge For Teachers: Opportunities To Learn To Teach Algebra In Teacher Education Programs, Eryn Stehr, Jeffrey Craig, Hyunyi Jung, Leonardo Medel, Alexia Mintos, Jill Newton
Mathematical Knowledge For Teachers: Opportunities To Learn To Teach Algebra In Teacher Education Programs, Eryn Stehr, Jeffrey Craig, Hyunyi Jung, Leonardo Medel, Alexia Mintos, Jill Newton
Hyunyi Jung
Preparing to Teach Algebra (PTA) Project gathered data about opportunities to learn to teach algebra provided by secondary teacher education programs. In sharing our findings, we use structures from the Mathematical Knowledge for Teaching (MKT) framework (Ball & Bass, 2003). The MKT framework is one way of situating the ways in which teacher education programs support preservice mathematics teachers in developing necessary knowledge types for teaching algebra. Using the MKT framework as an analytical framework is not straightforward, however. The framework must be interpreted and individualized to the study of algebra and to the opportunities to learn to teach algebra that ...
Mathematical Modeling Problems: What Affects Teaching Assistants’ Ability To Provide Feedback?, Hyunyi Jung, Alena Moon, Kelsey Joy Rodgers, Farshid Marbouti, Heidi A. DiefesDux
Mathematical Modeling Problems: What Affects Teaching Assistants’ Ability To Provide Feedback?, Hyunyi Jung, Alena Moon, Kelsey Joy Rodgers, Farshid Marbouti, Heidi A. DiefesDux
Hyunyi Jung
This paper describes opportunities and challenges teaching assistants (TAs) experience when they provide feedback on mathematical modeling problems. Eight TAs were interviewed regarding issues they experience while working for engineering courses in which about 2000 undergraduates create mathematical models to solve realistic problems and communicate their solutions. The opportunities and challenges are associated with the following factors: the process of providing feedback; TAs’ perspectives of modeling problems; and professional training to learn how to provide effective feedback on students’ solutions to mathematical modeling problems. The specific factors that influence TA’s abilities to provide formative feedback are discussed and the ...
Pedagogical Knowledge For Algebra On The Runway: Turning Research From The Icme12 Into Practice, Hyunyi Jung
Pedagogical Knowledge For Algebra On The Runway: Turning Research From The Icme12 Into Practice, Hyunyi Jung
Hyunyi Jung
This study addresses comparable concerns regarding pedagogical content knowledge (PCK) from different countries, experiences of teachers around the world regarding knowledge for teaching algebra, and the use of such experiences for teaching preservice teachers. Proceedings from the most recent International Congress on Mathematical Education were analyzed focusing on the importance of PCK and specialized knowledge for teaching algebra. Analysis of multiple international studies provided a holistic approach to bridge research into practice. In this paper, I present the findings of this analysis which were subsequently used to develop contents for teaching algebra in a methods course for preservice secondary mathematics ...
Developing Frameworks For Preparation Of Algebra Teachers: Challenges And Opportunities, Sharon L. Senk, Jill Newton, Jia He, Hyunyi Jung, Eryn Stehr, Alexia Mintos
Developing Frameworks For Preparation Of Algebra Teachers: Challenges And Opportunities, Sharon L. Senk, Jill Newton, Jia He, Hyunyi Jung, Eryn Stehr, Alexia Mintos
Hyunyi Jung
Algebra has long been considered the foundation for higherlevel mathematics and a gatekeeper for postsecondary opportunities. In recent decades, increasing enrollments in algebra have placed additional demands on algebra teachers for reaching a more diverse population of students. With the 2010 release and adoption of the Common Core State Standards for Mathematics (CCSSM) by all but a few states, questions arise regarding preparing teachers to teach the standards and practices described in CCSSM. In this paper, we describe the processes used to develop frameworks to study opportunities provided by secondary teacher preparation programs to learn about algebra, algebra teaching, achieving ...
Factors That Help And Hinder Teaching Assistants’ Ability To Execute Their Responsibilities, Farshid Marbouti, Kelsey Joy Rodgers, Hyunyi Jung, Alena Moon, Heidi A. DiefesDux
Factors That Help And Hinder Teaching Assistants’ Ability To Execute Their Responsibilities, Farshid Marbouti, Kelsey Joy Rodgers, Hyunyi Jung, Alena Moon, Heidi A. DiefesDux
Hyunyi Jung
Graduate and undergraduate teaching assistants (TAs) are key players in large universities’ efforts to incorporate studentcentered learning into science, technology, engineering, and mathematics (STEM) courses. This paper investigates, through interviews, the perspectives of eight TAs employed within a FirstYear Engineering course with a significant focus on openended problem solving. The purpose of this study was to identify factors that helped and hindered teaching assistants’ execution of their responsibilities which included grading and helping students. Engaging TAs in the openended problems prior to implementing them in class, facetoface discussions, and facetoface lectures were helpful components of training, and training overall was ...
Characteristics Of Feedback That Influence Student Confidence And Performance During Mathematical Modeling, Hyunyi Jung, Heidi A. DiefesDux, Aladar K. Horvath, Kelsey Joy Rodgers, Monica E. Cardella
Characteristics Of Feedback That Influence Student Confidence And Performance During Mathematical Modeling, Hyunyi Jung, Heidi A. DiefesDux, Aladar K. Horvath, Kelsey Joy Rodgers, Monica E. Cardella
Hyunyi Jung
This study focuses on characteristics of written feedback that influence students’ performance and confidence in addressing the mathematical complexity embedded in a ModelEliciting Activity (MEA). MEAs are authentic mathematical modeling problems that facilitate students’ iterative development of solutions in a realistic context. We analyzed 132 firstyear engineering students’ confidence levels and mathematical model scores on aMEA(pre and post feedback), along with teaching assistant feedback given to the students. The findings show several examples of affective and cognitive feedback that students reported that they used to revise their models. Students’ performance and confidence in developing mathematical models can be increased ...
Evaluation Of The Community Multiscale Air Quality Model For Simulating Winter Ozone Formation In The Uinta Basin, Rebecca Matichuk, Gail Tonnesen, Deborah Luecken, Rob Gillam, Sergey L. Napelenok, Kirk R. Baker, Donna Schwede, Ben Murphy, Detlev Helmig, Seth N. Lyman, Shawn Roselle
Evaluation Of The Community Multiscale Air Quality Model For Simulating Winter Ozone Formation In The Uinta Basin, Rebecca Matichuk, Gail Tonnesen, Deborah Luecken, Rob Gillam, Sergey L. Napelenok, Kirk R. Baker, Donna Schwede, Ben Murphy, Detlev Helmig, Seth N. Lyman, Shawn Roselle
Bingham Energy Research Center
The Weather Research and Forecasting (WRF) and Community Multiscale Air Quality (CMAQ) models were used to simulate a 10 day highozone episode observed during the 2013 Uinta Basin Winter Ozone Study (UBWOS). The baseline model had a large negative bias when compared to ozone (O_{3}) and volatile organic compound (VOC) measurements across the basin. Contrary to other wintertime Uinta Basin studies, predicted nitrogen oxides (NO_{x}) were typically low compared to measurements. Increases to oil and gas VOC emissions resulted in O_{3} predictions closer to observations, and nighttime O_{3} improved when reducing the deposition velocity for all ...
Emergent Ising Degrees Of Freedom Above A DoubleStripe Magnetic Ground State, Guanghua Zhang, Rebecca Flint
Emergent Ising Degrees Of Freedom Above A DoubleStripe Magnetic Ground State, Guanghua Zhang, Rebecca Flint
Ames Laboratory Accepted Manuscripts
Doublestripe magnetism [ Q = ( π / 2 , π / 2 ) ] has been proposed as the magnetic ground state for both the irontelluride and BaTi 2 Sb 2 O families of superconductors. Doublestripe order is captured within a J 1 − J 2 − J 3 Heisenberg model in the regime J 3 ≫ J 2 ≫ J 1 . Intriguingly, besides breaking spinrotational symmetry, the groundstate manifold has three additional Ising degrees of freedom associated with bond ordering. Via their coupling to the lattice, they give rise to an orthorhombic distortion and to two nonuniform lattice distortions with wave vector ( π , π ) . Because the ground state is fourfold ...
Texture Development And Coercivity Enhancement In Cast Alnico 9 Magnets, Wenyong Zhang, Shah Valloppilly, Xingzhong Li, Lanping Yue, Ralph Skomski, Iver Anderson, Matthew Kramer, Wei Tang, Jeff Shield, David J. Sellmyer
Texture Development And Coercivity Enhancement In Cast Alnico 9 Magnets, Wenyong Zhang, Shah Valloppilly, Xingzhong Li, Lanping Yue, Ralph Skomski, Iver Anderson, Matthew Kramer, Wei Tang, Jeff Shield, David J. Sellmyer
Faculty Publications from Nebraska Center for Materials and Nanoscience
The effect of Y addition and magnetic field on texture and magnetic properties of arcmelted alnico 9 magnets has been investigated. Small additions of Y (1.5 wt.%) develop a (200) texture for the arcmelted alnico 9 magnet. Such a texture is hard to form in cast samples. To achieve this goal, we set up a highfield annealing system with a maximum operation temperature of 1250^{0 }C. This system enabled annealing in a field of 45 kOe with subsequent draw annealing for the solutionized buttons; we have been able to substantially increase remanence ratio and coercivity, from 0.70 ...
Influence Of Classical Anisotropy Fields On The Properties Of Heisenberg Antiferromagnets Within Unified Molecular Field Theory, David C. Johnston
Influence Of Classical Anisotropy Fields On The Properties Of Heisenberg Antiferromagnets Within Unified Molecular Field Theory, David C. Johnston
Ames Laboratory Accepted Manuscripts
A comprehensive study of the influence of classical anisotropy fields on the magnetic properties of Heisenberg antiferromagnets within unified molecular field theory versus temperature T , magnetic field H , and anisotropy field parameter h A 1 is presented for systems comprised of identical crystallographicallyequivalent local moments. The anisotropy field for collinear z axis antiferromagnetic (AFM) ordering is constructed so that it is aligned in the direction of each ordered and/or fieldinduced thermalaverage moment with a magnitude proportional to the moment, whereas that for XY anisotropy is defined to be in the direction of the projection of the moment onto the ...