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Articles 1  30 of 29561
FullText Articles in Physics
Analog Implementation Of The HodgkinHuxley Model Neuron, Zachary D. Mobille, George H. Rutherford, Jordan BrandtTrainer, Rosangela Follmann, Epaminondas Rosa
Analog Implementation Of The HodgkinHuxley Model Neuron, Zachary D. Mobille, George H. Rutherford, Jordan BrandtTrainer, Rosangela Follmann, Epaminondas Rosa
Annual Symposium on Biomathematics and Ecology: Education and Research
No abstract provided.
Period Drift In A Neutrally Stable Stochastic Oscillator, Kevin Sanft
Period Drift In A Neutrally Stable Stochastic Oscillator, Kevin Sanft
Annual Symposium on Biomathematics and Ecology: Education and Research
No abstract provided.
Derivation Of Direct Explicit Integrators Of Rk Type For Solving Class Of SeventhOrder Ordinary Differential Equations, Mohammed S. Mechee, Jawad K. Mshachal
Derivation Of Direct Explicit Integrators Of Rk Type For Solving Class Of SeventhOrder Ordinary Differential Equations, Mohammed S. Mechee, Jawad K. Mshachal
Karbala International Journal of Modern Science
The main contribution of this work is the development of direct explicit methods of RungeKutta (RK) type for solving class of seventhorder ordinary differential equations (ODEs) to improve computational efficiency. For this purpose, we have generalized RK, RKN, RKD, RKT, RKFD and RKM methods for solving class of first, second, third, fourth, and fifthorder ODEs. Using Taylor expansion approach, we have derived the algebraic equations of the order conditions for the proposed RKM integrators up to the tenthorder. Based on these order conditions, two RKM methods of fifth and sixthorder with four and fivestage are derived. The zero stability of ...
Properties Of Concrete Modified With UltraFine Slag, Panga Narasimha Reddy, Javed Ahmed Naqash
Properties Of Concrete Modified With UltraFine Slag, Panga Narasimha Reddy, Javed Ahmed Naqash
Karbala International Journal of Modern Science
The supplementary cementitious materials (SCM) can be used as a replacement of cement in the construction industry to minimize the drawbacks of normal concrete such as the emission of carbon dioxide so as to be ecofriendly. This paper presents the effect of ultrafine slag (i.e. 25% of alccofine) as a replacement of cement for different water to binder ratios (i.e. 0.38, 0.4 and 0.45). The effect of alccofine on the concrete strength properties were studied at 7 and 28 days wherein considerable strength enhancement was observed compared to normal concrete. Thermogravimetric analysis was also carried ...
Electrical Properties Of Copper Iodine Prepared By Exploding Wire, Sawsan Hussein Abdullah, Mohammed Oudah Salman Dr, Hammad Raheem Humud Dr
Electrical Properties Of Copper Iodine Prepared By Exploding Wire, Sawsan Hussein Abdullah, Mohammed Oudah Salman Dr, Hammad Raheem Humud Dr
Karbala International Journal of Modern Science
Copper iodide (CuI) is one of the promising materials for use in many applications such as organic electronic devices. In this work, CuI nanoparticles were prepared using the exploding wire technique in an iodine solution and were deposited as thin films by a spin coating method to study its electrical properties. This study showed that all prepared thin films were a polycrystalline structure with γ phase. The electrical study showed that al film was ptype. The dielectric parameters depended on frequency and voltage. It can be noticed a small increase in ac conductivity by increasing the applied voltages in the ...
Analytical Approach To Investigation Of Free Vibration Of Thin Rectangular Plate Immersed In Fluid, Resting On Winkler And Pasternak Foundations, Obanishola Safiq, Gbeminiyi Sobamowo, Saheed Salawu
Analytical Approach To Investigation Of Free Vibration Of Thin Rectangular Plate Immersed In Fluid, Resting On Winkler And Pasternak Foundations, Obanishola Safiq, Gbeminiyi Sobamowo, Saheed Salawu
Karbala International Journal of Modern Science
Dynamic behaviour of free vibration of rectangular plate is investigated. This study considered an analytical approach to investigation of free vibration of thin rectangular plate immersed in fluid, resting on Winkler and Pasternak foundations.The governing nonlinear partial differential equation is analyzed using twodimensional differential transform method. The accuracy of the analytical solutions obtained is verified with existing results in literature and confirmed in excellent agreement. Thereafter, the analytical solutions are used for investigation of effect of elastic foundation, fluid and aspect ratio on vibrating plate.From the result, it is observed that, increase elastic foundation parameters increases natural frequency ...
ThermoMechanical Response Of SelfAssembled Nanoparticle Membranes, Yifan Wang, Henry Chan, Badri Narayanan, Sean P. Mcbride, Subramanian K.R.S. Sankaranarayanan, XiaoMin Lin, Heinrich M. Jaeger
ThermoMechanical Response Of SelfAssembled Nanoparticle Membranes, Yifan Wang, Henry Chan, Badri Narayanan, Sean P. Mcbride, Subramanian K.R.S. Sankaranarayanan, XiaoMin Lin, Heinrich M. Jaeger
Dr. Sean P. McBride
Ultrathin membranes composed of metallic or semiconducting nanoparticles capped with short ligand molecules are hybrid materials that have attracted considerable research interest.^{112} In contrast to twodimensional (2D) membranes such as graphene and transition metal dichalcogenides monolayers, nanoparticle membranes can be engineered to achieve widely tunable mechanical, electronic or optical properties through different combinations of inorganic cores and organic ligands. In terms of mechanical properties, these membranes can form large area (tens of microns in diameter) freestanding structures with high Young’s moduli (~GPa) and fracture strength.^{1,1315} Molecular dynamics (MD) simulations have indicated how this mechanical robustness can ...
Transmission And Guiding Of Fast Electrons Through Insulating Nanocapillaries And Comparison With Ion Guiding, Susanta Das
Transmission And Guiding Of Fast Electrons Through Insulating Nanocapillaries And Comparison With Ion Guiding, Susanta Das
Susanta Das
Transmission and guiding of fast electrons (500 and 1000 eV) through an insulating polyethylene terephthalate nanocapillary foil has been investigated and compared with results for slow highly charged ions. As for slow ions, guiding is attributed to chargeup of the inner walls near the capillary entrance, which, after a characteristic time, electrostatically deflects the traversing ions causing them to be guided through the sample along the capillary axis. The measurements were performed at WMU. Electron guiding is found to decrease faster with both energy and foil tilt angle than for ions. Ions lose negligible energy during the course of guiding ...
Monte Carlo Simulations Of Electrothermal Transport In Nanoelectronics, T. J. Spence
Monte Carlo Simulations Of Electrothermal Transport In Nanoelectronics, T. J. Spence
Science Seminars
The field of microelectronics plays an important role in many areas of engineering and science, being ubiquitous in aerospace, industrial manufacturing, biotechnology, and many other fields. The capacity to simulate new devices accurately is critical to the engineering design process, as device engineers use simulations to predict performance characteristics and identify potential issues before fabrication. In this talk, a Monte Carlo technique is presented for solving the classical Boltzmann Transport Equation, Poisson’s and Schrödinger’s equations for electrons and phonons.
Photochemistry On The Bottom Side Of The Mesospheric Na Layer, Tao Yuan, Wuhu Feng, John M. C. Plane, Daniel R. Marsh
Photochemistry On The Bottom Side Of The Mesospheric Na Layer, Tao Yuan, Wuhu Feng, John M. C. Plane, Daniel R. Marsh
Titus Yuan
Lidar observations of the mesospheric Na layer have revealed considerable diurnal variations, particularly on the bottom side of the layer, where more than an orderofmagnitude increase in Na density has been observed below 80 km after sunrise. In this paper, multiyear Na lidar observations are utilized over a full diurnal cycle at Utah State University (USU) (41.8o N, 111.8o W) and a global atmospheric model of Na with 0.5 km vertical resolution in the mesosphere and lower thermosphere (WACCMNa) to explore the dramatic changes of Na density on the bottom side of the layer. Photolysis of the ...
Enhancing Cellular Uptake Of Magnetic Nanoparticles For Cancer Therapy Via Nanoparticle Engineering & Sonoporation, Ronald Kumon, Prem Vaishnava, Ronald Tackett, Lihua Wang, Cheryl Samaniego, Alexis Siegel, Sally Dagher
Enhancing Cellular Uptake Of Magnetic Nanoparticles For Cancer Therapy Via Nanoparticle Engineering & Sonoporation, Ronald Kumon, Prem Vaishnava, Ronald Tackett, Lihua Wang, Cheryl Samaniego, Alexis Siegel, Sally Dagher
Cheryl Samaniego
Magnetic induction heating of iron oxide nanoparticles has been proposed as a method for noninvasive cancer treatment without the side effects of chemotherapy and ionizing radiation. At Kettering University we propose to improve the uptake of nanoparticles by cells through the use of nanoparticle engineering and ultrasonic fields.
Uncompensated Polarization In Incommensurate Modulations Of Perovskite Antiferroelectrics, Tao Ma, Zhongming Fan, Bin Xu, TaeHoon Kim, Ping Lu, Laurent Bellaiche, Matthew J. Kramer, Xiaoli Tan, Lin Zhou
Uncompensated Polarization In Incommensurate Modulations Of Perovskite Antiferroelectrics, Tao Ma, Zhongming Fan, Bin Xu, TaeHoon Kim, Ping Lu, Laurent Bellaiche, Matthew J. Kramer, Xiaoli Tan, Lin Zhou
Xiaoli Tan
Complex polar structures of incommensurate modulations (ICMs) are revealed in chemically modified PbZrO3 perovskite antiferroelectrics using advanced transmission electron microscopy techniques. The Pbcation displacements, previously assumed to arrange in a fullycompensated antiparallel fashion, are found to be either antiparallel but with different magnitudes, or in a nearly orthogonal arrangement in adjacent stripes in the ICMs. Ab initio calculations corroborate the lowenergy state of these arrangements. Our discovery corrects the atomic understanding of ICMs in PbZrO3based perovskite antiferroelectrics.
Obituary: Anthony Starace (19452019)
Obituary: Anthony Starace (19452019)
Anthony F. Starace Publications
Anthony Starace, George Holmes University Professor of physics, died Sept. 5 from complications related to pancreatitis. He was 74.
Starace was born July 24, 1945, in the Queens borough of New York City. He graduated from Stuyvesant High School and earned his bachelor’s degree from Columbia University in 1966 before moving west to the University of Chicago, where he earned his doctorate under adviser Ugo Fano in 1971. It was in Chicago that he met Katherine Fritz of Beatrice, Nebraska, his wife of 51 years.
Following a postdoctoral appointment at Imperial College London, Starace moved to Lincoln as an ...
Spatial And Orientational Control Of Liquid Crystal Alignment Using A Surface Localized Polymer Layer, Lu Lu, Tatiana Sergan, Vassili Sergan, Philip J. Bos
Spatial And Orientational Control Of Liquid Crystal Alignment Using A Surface Localized Polymer Layer, Lu Lu, Tatiana Sergan, Vassili Sergan, Philip J. Bos
Lu Lu
We present an alignment method for the surface contacting liquid crystal (LC) director. This method allows complete control of the polar pretilt angle as a function of position in a liquid crystal device, and has the potential of controlling the azimuthal orientation of LC. Important considerations of this method are to form a thin layer of reactive monomers at the LC cell interior surface, and to control the deleterious effects of flow due to polymerization induced concentration gradients. To achieve these, the voltage and frequency of the applied electric field and the UV intensity during the polymerization process are significant.
Mechanism Of ElectricFieldInduced Segregation Of Additives In A LiquidCrystal Host, Lu Lu, Vassili Sergan, Philip J. Bos
Mechanism Of ElectricFieldInduced Segregation Of Additives In A LiquidCrystal Host, Lu Lu, Vassili Sergan, Philip J. Bos
Lu Lu
The mechanism for electricfieldinduced segregation of additives, containing a polar group, in a host liquid crystal is proposed. It is shown that the polarity of an applied dc electric field, or the frequency of an ac electric field, strongly influences the segregation of reactive monomers containing an ester group. An explanation of this result is offered based on the association of dissolved ions with polar groups of the reactive monomers. This association is considered to cause these types of additives to drift to the cell surface in the presence of an external electric field. The described mechanism can be applied ...
Mechanisms Of Methane Transport Through Populus Trichocarpa, Ellynne Marie Kutschera, M. A. K. Khalil, Andrew Rice, Todd Rosenstiel
Mechanisms Of Methane Transport Through Populus Trichocarpa, Ellynne Marie Kutschera, M. A. K. Khalil, Andrew Rice, Todd Rosenstiel
Todd N. Rosenstiel
Although the dynamics of methane (CH4) emission from croplands and wetlands have been fairly well investigated, the contribution of trees to global CH4 emission and the mechanisms of tree transport are relatively unknown. CH4 emissions from the common wetland tree species Populus trichocarpa (black cottonwood) native to the Pacific Northwest were measured under hydroponic conditions in order to separate plant transport mechanisms from the influence of soil processes. Roots were exposed to CH4 enriched water and canopy emissions of CH4 were measured. The average flux for 34 trials (at temperatures ranging from 17 to 25 °C) was 2.8 ± 2 ...
Physics And Mathematics Of Graded Quivers, Azeem Hasan
Physics And Mathematics Of Graded Quivers, Azeem Hasan
All Dissertations, Theses, and Capstone Projects
A graded quiver with superpotential is a quiver whose arrows are assigned degrees c ∈ {0, 1, · · · , m}, for some integer m ≥ 0, with relations generated by a superpotential of degree m − 1. For m = 0, 1, 2, 3 they often describe the open string sector of Dbrane systems; in particular, they capture the physics of D(5 − 2m)branes at local CalabiYau (CY) (m + 2) fold singularities in type IIB string theory. We introduce mdimers, which fully encode the mgraded quivers and their superpotentials, in the case in which the CY (m + 2)folds are toric. A key result is ...
Sequential Discrimination Between NonOrthogonal Quantum States, Dov L. Fields
Sequential Discrimination Between NonOrthogonal Quantum States, Dov L. Fields
All Dissertations, Theses, and Capstone Projects
The problem of discriminating between nonorthogonal states is one that has generated a lot of interest. This basic formalism is useful in many areas of quantum information. It serves as a fundamental basis for many quantum key distribution schemes, it functions as an integral part of other quantum algorithms, and it is useful in experimental settings where orthogonal states are not always possible to generate. Additionally, the discrimination problem reveals important fundamental properties, and is intrinsically related to entanglement. In this thesis, the focus is on exploring the problem of sequentially discriminating between nonorthogonal states. In the simplest version these ...
On Different Parametrizations Of Feynman Integrals, Ray Daniel Sameshima
On Different Parametrizations Of Feynman Integrals, Ray Daniel Sameshima
All Dissertations, Theses, and Capstone Projects
In this doctoral thesis, we discuss and apply advanced techniques for the calculations of scattering amplitudes which, on the one hand, allow us to compute cross sections and differential distributions at high precision and, on the other hand, give us deep mathematical insights on the mathematical structures of Feynman integrals.
We start by presenting phenomenological calculations relevant for the experimental analyses at the Large Hadron Collider. We use the resummation of soft gluon emission corrections to study the associated production of a top pair and a Z boson to nexttonexttoleading logarithmic accuracy, and compute the total cross section and differential ...
Optical And Collective Properties Of Excitons In 2d Semiconductors, Matthew N. Brunetti
Optical And Collective Properties Of Excitons In 2d Semiconductors, Matthew N. Brunetti
All Dissertations, Theses, and Capstone Projects
We study the properties of excitons in 2D semiconductors (2DSC) by numerically solving the Schr\"{o}dinger equation for an interacting electron and hole in the effective mass approximation, then calculating optical properties such as the transition energies, oscillator strengths, and absorption coefficients. Our theoretical approach allows us to consider both direct excitons in monolayer (ML) 2DSC and spatially indirect excitons in heterostructures (HS) consisting of two 2DSC MLs separated by fewlayer insulating hexagonal boron nitride (hBN). In particular, we study indirect excitons in TMDC HS, namely MoS_{2}, MoSe_{2}, WS_{2}, and WSe_{2}; both direct and ...
Coulomb Excitation And Transport Properties Of Monolayer Graphene And The AlphaT3 Lattice, Dipendra Dahal
Coulomb Excitation And Transport Properties Of Monolayer Graphene And The AlphaT3 Lattice, Dipendra Dahal
All Dissertations, Theses, and Capstone Projects
In the past few years, I focused my attention in the study of 2D material's behavior, specifically graphene . We investigated several properties of graphene like transmission of particle through a potential barrier and demonstrated the effect of band gap to suppress the Klein tunneling at head on collision, we presented the results to get the criteria of negative refractive index and Klein tunneling through multiple barrier. Next, we have carried out the calculation of polarization function of graphene in the presence of magnetic field. The effect of integer Landau filling factor is shown and the portrayed results are presented ...
Inference Of Language Functional Network In Healthy, Cancerous And Bilingual Brains By Fmri And Network Modeling, Qiongge Li
All Dissertations, Theses, and Capstone Projects
We study the underlying mechanism by which language processing occurs in the human brain using inference methods on functional magnetic resonance imaging data. The data analyzed stems from several cohorts of subjects; a monolingual group, a bilingual group, a healthy control group and one diseased case. We applied a complex statistical inference pipeline to determine the network structure of brain components involved with language. This healthy network reveals a fully connected triangular relationship between the preSupplementary Motor Area (preSMA), the Broca's Area (BA), and the ventral PreMotor Area (PreMA) in the left hemisphere. This "triangle'' shows consistently in all ...
Studying NearCritical And SuperCritical Fluids In Reduced Gravity, Christian Hawkins, Ana Oprisan, Carole LecoutreChabot, Yves Garrabos, Daniel Beysens
Studying NearCritical And SuperCritical Fluids In Reduced Gravity, Christian Hawkins, Ana Oprisan, Carole LecoutreChabot, Yves Garrabos, Daniel Beysens
Journal of the South Carolina Academy of Science
Critical and supercritical fluids have a variety of applications, from use as machine lubricants in high pressure or high temperature environments to the manufacturing of materials such as aerogel. The optical properties of fluids undergo rapid changes near the critical point resulting in a rapid increase in turbidity known as critical opalescence. These optical changes can be used to probe the universality of critical behavior. As a fluid approaches the critical point, the compressibility rapidly increases. In a gravitational field, this increase in compressibility leads to nearcritical fluids stratifying by phase and density, making it difficult to observe the optical ...
Table Of Contents
Journal of the South Carolina Academy of Science
No abstract provided.
Correlations Between Short And LongTime Relaxation In Colloidal Supercooled Liquids And Glasses, Chandan K. Mishra, Xiaoguang Ma, Piotr Habdas, Kevin B. Aptowicz, A. G. Yodh
Correlations Between Short And LongTime Relaxation In Colloidal Supercooled Liquids And Glasses, Chandan K. Mishra, Xiaoguang Ma, Piotr Habdas, Kevin B. Aptowicz, A. G. Yodh
Physics
Spatiotemporal dynamics of short and longtime structural relaxation are measured experimentally as a function of packing fraction, φ, in quasitwodimensional colloidal supercooled liquids and glasses. The relaxation times associated with longtime dynamic heterogeneity and shorttime intracage motion are found to be strongly correlated and to grow by orders of magnitude with increasing φ toward dynamic arrest. We find that clusters of fast particles on the two timescales often overlap, and, interestingly, the distribution of minimumspatialseparation between closest nonoverlapping clusters across the two timescales is revealed to be exponential with a decay length that increases with φ. In total, the experimental ...
FatigueResistant HighPerformance Elastocaloric Materials Via Additive Manufacturing, Huilong Hou, Emrah Simsek, Tao Ma, Nathan S. Johnson, Suxin Qian, Cheikh Cissé, Drew Stasak, Naila Al Hasan, Lin Zhou, Yunho Hwang, Reinhard Radermacher, Valery I. Levitas, Matthew J. Kramer, Mohsen Asle Zaeem, Aaron P. Stebner, Ryan T. Ott, Jun Cui, Ichiro Takeuchi
FatigueResistant HighPerformance Elastocaloric Materials Via Additive Manufacturing, Huilong Hou, Emrah Simsek, Tao Ma, Nathan S. Johnson, Suxin Qian, Cheikh Cissé, Drew Stasak, Naila Al Hasan, Lin Zhou, Yunho Hwang, Reinhard Radermacher, Valery I. Levitas, Matthew J. Kramer, Mohsen Asle Zaeem, Aaron P. Stebner, Ryan T. Ott, Jun Cui, Ichiro Takeuchi
Valery I. Levitas
Elastocaloric cooling, which exploits the latent heat released and absorbed as stressinduced phase transformations are reversibly cycled in shape memory alloys, has recently emerged as a frontrunner in nonvaporcompression cooling technologies. The intrinsically high thermodynamic efficiency of elastocaloric materials is limited only by work hysteresis. Here, we report on creating highperformance lowhysteresis elastocaloric cooling materials via additive manufacturing of TitaniumNickel (TiNi) alloys. Contrary to established knowledge of the physical metallurgy of TiNi alloys, intermetallic phases are found to be beneficial to elastocaloric performances when they are combined with the binary TiNi compound in nanocomposite configurations. The resulting microstructure gives rise ...
The Effect Of Spatial Averaging On Db/Dt Exposure Values For Implanted Medical Devices, Christopher Ap Brown
The Effect Of Spatial Averaging On Db/Dt Exposure Values For Implanted Medical Devices, Christopher Ap Brown
Electronic Thesis and Dissertation Repository
Magnetic resonance imaging (MRI) is a medical imaging modality that has seen continuous growth in the decades since its introduction. In conjunction with this increase in the use of MRI, there has also been a growth in the number of patients having implanted medical devices, such as pacemakers. These devices can have undesirable interactions with the MR system. The safety of these interactions must be guaranteed while ensuring that safety limits are not so conservative that they would preclude too many patients from benefiting from MRI. One factor that could make limits less restrictive is spatial averaging of the fields ...
SelfConsistent TwoGap Description Of Mgb2 Superconductor, Hyunsoo Kim, Kyuil Cho, Makariy A. Tanatar, Valentin Taufour, Stella K. Kim, Sergey L. Bud’Ko, Paul C. Canfield, Vladimir G. Kogan, Ruslan Prozorov
SelfConsistent TwoGap Description Of Mgb2 Superconductor, Hyunsoo Kim, Kyuil Cho, Makariy A. Tanatar, Valentin Taufour, Stella K. Kim, Sergey L. Bud’Ko, Paul C. Canfield, Vladimir G. Kogan, Ruslan Prozorov
Paul C. Canfield
A selfconsistent twogap γ model is used to quantitatively describe several thermodynamic properties of MgB 2 superconductor. The superconducting coupling matrix, νij , was obtained from the fitting of the superfluid density in the entire superconducting temperature range. Using this input, temperaturedependent superconducting gaps, specific heat, and upper critical fields were calculated with no adjustable parameters and compared with the experimental data as well as with the firstprinciples calculations. The observed agreement between fit and data shows that γ model provides adequate quantitative description of the twogap superconductivity in MgB 2 and may serve as a relatively simple and versatile selfconsistent ...
CompositionDependent Stability Of The MediumRange Order Responsible For Metallic Glass Formation, Feng Zhang, Min Ji, XiaoWei Fang, Yang Sun, CaiZhuang Wang, Mikhail I. Mendelev, Matthew J. Kramer, Ralph E. Napolitano, KaiMing Ho
CompositionDependent Stability Of The MediumRange Order Responsible For Metallic Glass Formation, Feng Zhang, Min Ji, XiaoWei Fang, Yang Sun, CaiZhuang Wang, Mikhail I. Mendelev, Matthew J. Kramer, Ralph E. Napolitano, KaiMing Ho
Ralph E. Napolitano
The competition between the characteristic mediumrange order corresponding to amorphous alloys and that in ordered crystalline phases is central to phase selection and morphology evolution under various processing conditions. We examine the stability of a model glass system, Cu–Zr, by comparing the energetics of various mediumrange structural motifs over a wide range of compositions using firstprinciples calculations. We focus specifically on motifs that represent possible building blocks for competing glassy and crystalline phases, and we employ a genetic algorithm to efficiently identify the energetically favored decorations of each motif for specific compositions. Our results show that a Bergmantype motif ...