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Articles 1  30 of 208
FullText Articles in Physics
Fabrication Of Magnetocaloric La(Fe,Si)13 Thick Films, N H. Dung, N B. Doan, P De Rango, L Ranno, Karl G. Sandeman, N M. Dempsey
Fabrication Of Magnetocaloric La(Fe,Si)13 Thick Films, N H. Dung, N B. Doan, P De Rango, L Ranno, Karl G. Sandeman, N M. Dempsey
Publications and Research
La(Fe,Si)_{13}–based compounds are considered to be very promising magnetocaloric materials for magnetic refrigeration applications. Many studies have focused on this material family but only in bulk form. In this paper we report on the fabrication of thick films of La(Fe,Si)_{13}, both with and without posthydriding. These films exhibit magnetic and structural properties comparable to bulk materials. We also observe that the ferromagnetic phase transition has a negative thermal hysteresis, a phenomenon not previously found in this material but which may have its origins in the availability of a strain energy reservoir, as in ...
Syllabus Ee330 Electromagnetics, Nicholas Madamopoulos
Syllabus Ee330 Electromagnetics, Nicholas Madamopoulos
Open Educational Resources
Concepts covered in the undergraduate electrical engineering class of electromagnetics
Effect Of DirectCurrent Magnetic Field On The Specific Absorption Rate Of Metamagnetic Comnsi: A Potential Approach To Switchable Hyperthermia Therapy, K C. Ugochukwu, M M. Sadiq, E S. Biegel, L Meagher, M R. Hill, Karl G. Sandeman, A Haydon, K Suzuki
Effect Of DirectCurrent Magnetic Field On The Specific Absorption Rate Of Metamagnetic Comnsi: A Potential Approach To Switchable Hyperthermia Therapy, K C. Ugochukwu, M M. Sadiq, E S. Biegel, L Meagher, M R. Hill, Karl G. Sandeman, A Haydon, K Suzuki
Publications and Research
Materials with 1st order antiferromagnetic (AFM) to highmagnetization (MM) phase transition known for their inverse magnetocaloric effect, abrupt rise in magnetization and magnetoelastic coupling, are promising for application in combined simultaneous diagnosis and targeted cancer therapy. A therapy that combines alternatingcurrent (ac) and directcurrent (dc) magnetic fields for simultaneous magnetic hyperthermia therapy (MHT) and magnetic resonance imaging (MRI), using same magnetic particles for heating and as con trast agents. We report a proofofconcept study on the induction heating ability of 1st order metamagnetic material with moderate specific absorption rates (SAR) and no tendency for agglomeration, for potential MHT and MRI ...
Mode Discrimination In Dissipatively Coupled Laser Arrays, Jiajie Ding, MohammadAli Miri
Mode Discrimination In Dissipatively Coupled Laser Arrays, Jiajie Ding, MohammadAli Miri
Publications and Research
No abstract provided.
Optical Potts Machine Through Networks Of ThreePhoton DownConversion Oscillators, Mostafa HonariLatifpour, MohammadAli Miri
Optical Potts Machine Through Networks Of ThreePhoton DownConversion Oscillators, Mostafa HonariLatifpour, MohammadAli Miri
Publications and Research
In recent years there has been a growing interest in optical simulation of lattice spin models for applications in classical computing. Here, we propose optical implementation of a threestate Potts spin model by using networks of coupled parametric oscillators with phase tristability. We first show that the cubic nonlinear process of spontaneous threephoton downconversion is accompanied by a tristability in the phase of the subharmonic signal between three states with 2��/3 phase contrast. The phase of such a parametric oscillator behaves like a threestate spin system. Next, we show that a network of dissipatively coupled threephoton downconversion oscillators emulates ...
An Application Of The Ising Model, Juliano A. Everett
An Application Of The Ising Model, Juliano A. Everett
Publications and Research
Understanding how the Ising model works,what it represents, and how it can be applied to neurology. Given that an Ising model is an Entropy model that could be representative of the firing of neurons, some assumptions of the system are made and then the process is simulated through Monte Carlo methods.
Static Solid Relaxation Ordered Spectroscopy: SsRosy, Gregory S. Boutis, Ravinath Kausik
Static Solid Relaxation Ordered Spectroscopy: SsRosy, Gregory S. Boutis, Ravinath Kausik
Publications and Research
A twodimensional pulse sequence is introduced for correlating nuclear magnetic resonance anisotropic chemical shifts to a relaxation time (e.g., T1) in solids under static conditions. The sequence begins with a preparatory stage for measuring relaxation times, and is followed by a multiple pulse sequence for homonuclear dipolar decoupling. Data analysis involves the use of Fourier transform, followed by a onedimensional inverse Laplace transform for each frequency index. Experimental results acquired on solid samples demonstrate the general approach, and additional variations involving heteronuclear decoupling and magic angle spinning are discussed.
Biophysics In Applications, Marilyn R. Gunner
Biophysics In Applications, Marilyn R. Gunner
Open Educational Resources
No abstract provided.
Yields Of Weakly Bound Light Nuclei As A Probe Of The Statistical Hadronization Model, Yiming Cai, Thomas D. Cohen, Boris A. Gelman, Yukari Yamauchi
Yields Of Weakly Bound Light Nuclei As A Probe Of The Statistical Hadronization Model, Yiming Cai, Thomas D. Cohen, Boris A. Gelman, Yukari Yamauchi
Publications and Research
The statistical hadronization model successfully describes the yields of hadrons and light nuclei from central heavyion collisions over a wide range of energies. It is a simple and efficient phenomenological framework in which the relative yields for very high energy collisions are essentially determined by a single model parameter—the chemical freezeout temperature. Recent measurements of yields of hadrons and light nuclei covering over nine orders of magnitudes from the ALICE collaboration at the Large Hadron Collider were described by the model with remarkable accuracy with a chemical freezeout temperature of 156.5 ± 1.5 MeV. A key physical question ...
Rocketry And Observability Predictions For Cubesat, Juliano A. Everett
Rocketry And Observability Predictions For Cubesat, Juliano A. Everett
Publications and Research
Estimating the visibility of Sunlight reflected by the holographic retroreflector of Cubesat Alpha, and to convert this to star apparent magnitude to learn more about the visibility of these sails through reflected sunlight, to in turn determine if glints of these holograms are visible by terrestrial observers.
Exploring A Practical Development Of Quantum Computing, Juliano A. Everett, Andrea N. Zambrano, Carlos Aguayza
Exploring A Practical Development Of Quantum Computing, Juliano A. Everett, Andrea N. Zambrano, Carlos Aguayza
Publications and Research
Tasked with describing a Quantum architecture (Superconducting loops), we additionally explored how the chosen architecture is used, developed, and how one could get started in understanding the way in which some quantum algorithms work with this architecture through Python and IBM's tools (Qiskit and IBM Q Experience).
Peculiar Optical Properties Of Bilayer Silicene Under The Influence Of External Electric And Magnetic Fields, ThiNga Do, Godfrey Gumbs, PoHsin Shih, Danhong Huang, ChihWei Chiu, ChiaYun Chen, MingFa Lin
Peculiar Optical Properties Of Bilayer Silicene Under The Influence Of External Electric And Magnetic Fields, ThiNga Do, Godfrey Gumbs, PoHsin Shih, Danhong Huang, ChihWei Chiu, ChiaYun Chen, MingFa Lin
Publications and Research
We conduct a comprehensive investigation of the effect of an applied electric field on the optical and magnetooptical absorption spectra for ABbt (bottomtop) bilayer silicene. The generalized tightbinding model in conjunction with the Kubo formula is efficiently employed in the numerical calculations. The electronic and optical properties are greatly diversified by the buckled lattice structure, stacking configuration, intralayer and interlayer hopping interactions, spinorbital couplings, as well as the electric and magnetic fields (Ez ˆz & Bz ˆz ). An electric field induces spinsplit electronic states, a semiconductormetal phase transitions and the Dirac cone formations in different valleys, leading to the special absorption ...
New Perspectives On The SchrödingerPauli Theory Of Electrons: Part I, Viraht Sahni
New Perspectives On The SchrödingerPauli Theory Of Electrons: Part I, Viraht Sahni
Publications and Research
SchrödingerPauli (SP) theory is a description of electrons in the presence of a static electromagnetic field in which the interaction of the magnetic field with both the orbital and spin moments is explicitly considered. The theory is described from the new perspective of the individual electron via its equation of motion or ‘Quantal Newtonian’ first law. The law is in terms of ‘classical’ fields whose sources are quantum mechanical expectation values of Hermitian operators taken with respect to the system wave function. The law states that each electron experiences an external and an internal field, the sum of which vanish ...
New Perspectives On The SchrödingerPauli Theory Of Electrons: Part Ii: Application To The Triplet State Of A Quantum Dot In A Magnetic Field, Marlina Slamet, Viraht Sahni
New Perspectives On The SchrödingerPauli Theory Of Electrons: Part Ii: Application To The Triplet State Of A Quantum Dot In A Magnetic Field, Marlina Slamet, Viraht Sahni
Publications and Research
The SchrödingerPauli (SP) theory of electrons in the presence of a static electromagnetic field can be described from the perspective of the individual electron via its equation of motion or 'Quantal Newtonian' first law. The law is in terms of 'classical' fields whose sources are quantummechanical expectation values of Hermitian operators taken with respect to the wave function. The law states that the sum of the external and internal fields experienced by each electron vanishes. The external field is the sum of the binding electrostatic and Lorentz fields. The internal field is the sum of fields representative of properties of ...
Computational Techniques For Scattering Amplitudes, Juliano A. Everett
Computational Techniques For Scattering Amplitudes, Juliano A. Everett
Publications and Research
Scattering amplitudes in quantum field theory can be described as the probability of a scattering process to happen within a high energy particle interaction, as well as a bridge between experimental measurements and the prediction of the theory.
In this research project, we explore the Standard Model of Particle Theory, it’s representation in terms of Feynman diagrams and the algebraic formulas associated with each combination.
Using the FeynArts program as a tool for generating Feynman diagrams, we evaluate the expressions of a set of physical processes, and explain why these techniques become necessary to achieve this goal.
Impact Of Fiber Parameters On Edfa And/Or Raman Amplified HighSpectralEfficiency Coherent Wdm Transmissions, Lufeng Leng
Impact Of Fiber Parameters On Edfa And/Or Raman Amplified HighSpectralEfficiency Coherent Wdm Transmissions, Lufeng Leng
Publications and Research
The impact of fiber properties is investigated for coherent systems employing polarizationdivision multiplexed highlevel quadrature amplitude modulation, wavelengthdivision multiplexing, and erbiumdoped fiber amplifier and/or distributed Raman amplification. This is done by comparing the performances of fiber links of various attenuation coefficients and effective areas via experimentally verified analytical methods. Results show that the excess noise, which originates at amplifiers compensating for the losses of filters and switches located between fiber spans, can weaken or even diminish the performance enhancement brought about by lowering the fiber attenuation coefficient, especially if distributed Raman amplification is employed. This leads to the difference ...
Study Of The Kinetic Energy Densities Of Electrons As Applied To Quantum Dots In A Magnetic Field, Marlina Slamet, Viraht Sahni
Study Of The Kinetic Energy Densities Of Electrons As Applied To Quantum Dots In A Magnetic Field, Marlina Slamet, Viraht Sahni
Publications and Research
There are three expressions for the kinetic energy density t(r) expressed in terms of its quantal source, the single‐particle density matrix: t_{A}(r), the integrand of the kinetic energy expectation value; t_{B}(r), the trace of the kinetic energy tensor; t_{C}(r), a virial form in terms of the 'classical' kinetic field. These kinetic energy densities are studied by application to 'artificial atoms' or quantum dots in a magnetic field in a ground and excited singlet state. A comparison with the densities for natural atoms and molecules in their ground state is made. The near ...
The Diverse MagnetoOptical Selection Rules In Bilayer Black Phosphorus, JhaoYing Wu, SzuChao Chen, ThiNga Do, WuPei Su, Godfrey Gumbs, MingFa Lin
The Diverse MagnetoOptical Selection Rules In Bilayer Black Phosphorus, JhaoYing Wu, SzuChao Chen, ThiNga Do, WuPei Su, Godfrey Gumbs, MingFa Lin
Publications and Research
The magnetooptical properties of bilayer phosphorene is investigated by the generalized tightbinding model and the gradient approximation. The vertical interLandaulevel transitions, being sensitive to the polarization directions, are mainly determined by the spatial symmetries of subenvelope functions on the distinct sublattices. The anisotropic excitations strongly depend on the electric and magnetic fields. A uniform perpendicular electric field could greatly diversify the selection rule, frequency, intensity, number and form of symmetric absorption peaks. Specifically, the unusual magnetooptical properties appear beyond the critical field as a result of two subgroups of Landau levels with the main and side modes. The rich and ...
Kinetic Effects In 2d And 3d Quantum Dots: Comparison Between High And Low Electron Correlation Regimes, Marlina Slamet, Viraht Sahni
Kinetic Effects In 2d And 3d Quantum Dots: Comparison Between High And Low Electron Correlation Regimes, Marlina Slamet, Viraht Sahni
Publications and Research
Kinetic related ground state properties of a twoelectron 2D quantum dot in a magnetic field and a 3D quantum dot (Hooke's atom) are compared in the Wigner high (HEC) and low (LEC) electron correlation regimes. The HEC regime corresponds to low densities sufficient for the creation of a Wigner molecule. The LEC regime densities are similar to those of natural atoms and molecules. The results are determined employing exact closedform analytical solutions of the SchrödingerPauli and Schrödinger equations, respectively. The properties studied are the local and nonlocal quantal sources of the density and the single particle density matrix; the ...
Comparative Study Of Qubits, Juliano A. Everett, Mubinjon Satymov, Zechariah Ilmot
Comparative Study Of Qubits, Juliano A. Everett, Mubinjon Satymov, Zechariah Ilmot
Publications and Research
In quantum computing, a quantum bit ("qubit") is a unit of quantum information. A qubit is a twolevel quantum system. The developing of qubits with optimal properties, related to quantum entanglement and possibilities of control the states of qubits, is very important for quantum computing applications. We analyzed various types of qubits. There are at least five major quantum computing approaches being explored worldwide: silicon spin qubits, ion traps, superconducting loops, diamond vacancies and topological qubits. We compared the advantages and disadvantages in the properties of all these qubits for applications for quantum computing. We analyzed possible strategies to improve ...
Multi Institutional Quantitative Phantom Study Of Yttrium90 Pet In Pet/Mri: The MrQuest Study, Nicole M. Maughan, Mootaz Eldib, David Faul, Maurizio Conti, Mattijs Elschot, Karin Knešaurek, Francesca Leek, David Townsend, Frank P. Difilippo, Kimberly Jackson, Stephan G. Nekolla, Mathias Lukas, Michael Tapner, Parag J. Parikh, Richard Laforest
Multi Institutional Quantitative Phantom Study Of Yttrium90 Pet In Pet/Mri: The MrQuest Study, Nicole M. Maughan, Mootaz Eldib, David Faul, Maurizio Conti, Mattijs Elschot, Karin Knešaurek, Francesca Leek, David Townsend, Frank P. Difilippo, Kimberly Jackson, Stephan G. Nekolla, Mathias Lukas, Michael Tapner, Parag J. Parikh, Richard Laforest
Publications and Research
Background
Yttrium90 (^{90}Y) radioembolization involves the intraarterial delivery of radioactive microspheres to treat hepatic malignancies. Though this therapy involves careful pretreatment planning and imaging, little is known about the precise location of the microspheres once they are administered. Recently, there has been growing interest postradioembolization imaging using positronemission tomography (PET) for quantitative dosimetry and identifying lesions that may benefit from additional salvage therapy. In this study, we aim to measure the intercenter variability of ^{90}Y PET measurements as measured on PET/MRI in preparation for a multiinstitutional prospective phase I/II clinical trial.
Eight institutions participated in this ...
Diy Science Sims, James Hedberg
Dissipation Effects In Schrödinger And Quantal Density Functional Theories Of Electrons In An Electromagnetic Field, XiaoYin Pan, Viraht Sahni
Dissipation Effects In Schrödinger And Quantal Density Functional Theories Of Electrons In An Electromagnetic Field, XiaoYin Pan, Viraht Sahni
Publications and Research
Dissipative effects arise in an electronic system when it interacts with a timedependent environment. Here, the Schrödinger theory of electrons in an electromagnetic field including dissipative effects is described from a new perspective. Dissipation is accounted for via the effective Hamiltonian approach in which the electron mass is timedependent. The perspective is that of the individual electron: the corresponding equation of motion for the electron or timedependent differential virial theorem—the ‘Quantal Newtonian’ second law—is derived. According to the law, each electron experiences an external field comprised of a binding electric field, the Lorentz field, and the electromagnetic field ...
Demonstration Of UltraHigh Recyclable Energy Densities In DomainEngineered Ferroelectric Films, Hongbo Cheng, Jun Ouyang, YunXiang Zhang, David J. Ascienzo, Yao Li, YuYao Zhao, Yuhang Ren
Demonstration Of UltraHigh Recyclable Energy Densities In DomainEngineered Ferroelectric Films, Hongbo Cheng, Jun Ouyang, YunXiang Zhang, David J. Ascienzo, Yao Li, YuYao Zhao, Yuhang Ren
Publications and Research
Dielectric capacitors have the highest charge/discharge speed among all electrical energy devices, but lag behind in energy density. Here we report dielectric ultracapacitors based on ferroelectric films of Ba(Zr0.2,Ti0.8)O3 which display highenergy densities (up to 166 J cm–3) and efficiencies (up to 96%). Different from a typical ferroelectric whose electric polarization is easily saturated, these Ba(Zr0.2,Ti0.8)O3 films display a much delayed saturation of the electric polarization, which increases continuously from nearly zero at remnant in a multipolar state, to a large value under the maximum electric field, leading ...
Dynamic SelfAssembly And SelfOrganized Transport Of Magnetic MicroSwimmers, Gašper Kokot, German Kolmakov V, Igor S. Aranson, Alexey Snezhko
Dynamic SelfAssembly And SelfOrganized Transport Of Magnetic MicroSwimmers, Gašper Kokot, German Kolmakov V, Igor S. Aranson, Alexey Snezhko
Publications and Research
We demonstrate experimentally and in computer simulations that magnetic microfloaters can selforganize into various functional structures while energized by an external alternating (ac) magnetic field. The structures exhibit selfpropelled motion and an ability to carry a cargo along a predefined path. The morphology of the selfassembled swimmers is controlled by the frequency and amplitude of the magnetic field.
Experiential Learning Opportunity (Elo) And Utilization Of FieldAndData Based Information Obtained Through The Infusion Of Technology: Highlights On Nasa Stem And Earth Science Curricula, Nazrul I. Khandaker, Matthew Khargie, Shuayb Siddiqu, Sol De Leon, Katina Singh, Newrence Wills, Krishna Mahibar
Experiential Learning Opportunity (Elo) And Utilization Of FieldAndData Based Information Obtained Through The Infusion Of Technology: Highlights On Nasa Stem And Earth Science Curricula, Nazrul I. Khandaker, Matthew Khargie, Shuayb Siddiqu, Sol De Leon, Katina Singh, Newrence Wills, Krishna Mahibar
Publications and Research
There is a greater emphasis on handson involvement and critical thinking skills in the geosciences and other STEM fields to inspire and engage K 16 students to value scientific content and enable them to discover the welldocumented nature of the fundamental scientific principles needed to explain various earth science and other STEMrelated core phenomena. NASA MAA curricula are ideal for engaging K116 students in this context, since gradespecific lesson plans openup a plethora of pedagogically sound and relevant earth science activities. These include earth’s materials and properties, meteorites, robotics, hot air balloon, flight simulation, star gazing, material science, crystal ...
Stochastic Resonance In A Proton Pumping Complex I Of Mitochondria Membranes, Davneet Kaur, Ilan Filonenko, Lev Mourokh, Cornelius Fendler, Robert H. Blick
Stochastic Resonance In A Proton Pumping Complex I Of Mitochondria Membranes, Davneet Kaur, Ilan Filonenko, Lev Mourokh, Cornelius Fendler, Robert H. Blick
Publications and Research
We make use of the physical mechanism of proton pumping in the socalled Complex I within mitochondria membranes. Our model is based on sequential charge transfer assisted by conformational changes which facilitate the indirect electronproton coupling. The equations of motion for the proton operators are derived and solved numerically in combination with the phenomenological Langevin equation describing the periodic conformational changes. We show that with an appropriate set of parameters, protons can be transferred against an applied voltage. In addition, we demonstrate that only the joint action of the periodic energy modulation and thermal noise leads to efficient uphill proton ...
Holography For Field Theory Solitons, Sophia K. Domokos, Andrew B. Royston
Holography For Field Theory Solitons, Sophia K. Domokos, Andrew B. Royston
Publications and Research
We extend a wellknown Dbrane construction of the AdS/dCFT correspondence to nonabelian defects. We focus on the bulk side of the correspondence and show that there exists a regime of parameters in which the lowenergy description consists of two approximately decoupled sectors. The two sectors are gravity in the ambient spacetime, and a sixdimensional supersymmetric YangMills theory. The YangMills theory is defined on a rigid AdS4 S2 background and admits sixteen supersymmetries. We also consider a oneparameter deformation that gives rise to a family of YangMills theories on asymptotically AdS4 S2 spacetimes, which are invariant under eight supersymmetries. With ...
Quadrality For Supersymmetric Matrix Models, Sebastian Franco, Sangmin Lee, RakKyeong Seong, Cumrun Vafa
Quadrality For Supersymmetric Matrix Models, Sebastian Franco, Sangmin Lee, RakKyeong Seong, Cumrun Vafa
Publications and Research
We introduce a new duality for N = 1 supersymmetric gauged matrix models. This 0d duality is an order 4 symmetry, namely an equivalence between four different theories, hence we call it Quadrality. Our proposal is motivated by mirror symmetry, but is not restricted to theories with a Dbrane realization and holds for general N = 1 matrix models. We present various checks of the proposal, including the matching of: global symmetries, anomalies, deformations and the chiral ring. We also consider quivers and the corresponding quadrality networks. Finally, we initiate the study of matrix models that arise on the worldvolume of D ...
LightInduced Electrohydrodynamic Instability In Plasmonically Absorbing Gold Nanofluids, Sujan Shrestha, Luat T. Vuong, Jorge Luis DominguezJuarez
LightInduced Electrohydrodynamic Instability In Plasmonically Absorbing Gold Nanofluids, Sujan Shrestha, Luat T. Vuong, Jorge Luis DominguezJuarez
Publications and Research
Plasmonically absorbing nanofluids exhibit lightinduced electrokinetics. We measure an electrical response to the lightinduced RayleighBénardMarangoni convective instabilities in goldpolyvinylpyrrolidone (PVP) nanoparticles (NPs) suspended in isopropanol and water. Microampere current oscillations are measured and attributed to the presence of the AuPVP NPs with negative zeta potential, in correspondence with the accompanying thermal lens oscillations and a nanofluid thermoelectric effect. The measured electrical oscillations represent an electrohydrodynamic stability driven by light, one among many that should be observed with plasmonic nanoparticles in liquids.