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CreatorTitleDescriptionSubjectDate
51 Simpson, Jamesina J.Introducing a new method for FDTD modeling of electromagnetic wave propagation in magnetized plasmaComputational investigations of electromagnetic wave propagation in the upper atmosphere are important for studying space weather hazards, such as geomagnetically induced currents (GICs). GICs are currents generated in gas/oil pipelines, railroads, and electric power networks due to solar storms and...2014-01-01
52 Tiwari, AshutoshTb2O3 thin films: An alternative candidate for high-k dielectric applicationsWe are reporting the growth and structural, optical, and dielectric properties of Tb2O3, a relatively unexplored high-k dielectric material. A pulsed-laser deposition technique was used to grow Tb2O3 thin-films on four different substrates: Si(100), SrTiO3(100), LaAlO3(100), and MgO(100). High resol...2014-01-01
53 Scarpulla, MichaelThe importance of Se partial pressure in the laser annealing of CuInSe2 electrodeposited precursorsOne method for producing CuInSe2 (CISe) absorber layers is electrodeposition followed by annealing. Replacing the commonly used furnace annealing step with a laser can reduce annealing times by 2-3 orders of magnitude: from 30 minutes to 1 s. However, laser processing has, to date, not resulted in a...2014-01-01
54 Khan, Faisal HabibReliability analysis and performance degradation of a boost converterIn general, power converters are operated in closed-loop systems, and any characteristic variations in one component will simultaneously alter the operating point of other components, resulting in a shift in overall reliability profile. This interdependence makes the reliability of a converter a com...2014-01-01
55 Scarpulla, MichaelTemperature dependence of equivalent circuit parameters used to analyze admittance spectroscopy and application to CZTSe devicesWe present a device physics and equivalent circuit model for admittance spectroscopy of CZTSe based photovoltaic devices. The experimental variations of the capacitance and conductance in the depletion width are reproduced for state of the art coevaporated CZTSe devices. We will show that simple Arr...2014-01-01
56 Scarpulla, MichaelTe-rich CdTe surface by pulsed UV laser treatment for ohmic back contact formationPulsed UV laser treatments have recently been applied to polycrystalline CdTe solar cells to create an ohmic back contact. In this work, we investigate the surface stoichiometry variations produced by pulsed laser excitation using X-ray photoelectron spectroscopy (XPS). These results reveal surfaces...2014-01-01
57 Tiwari, AshutoshShape of the Hanle curve in spin-transport structures in the presence of an ac driveResistance between two ferromagnetic electrodes coupled to a normal channel depends on their relative magnetizations. The spin-dependent component, R, of the resistance changes with magnetic field, B, normal to the directions of magnetizations. In the field of spin transport, this change, R(B), orig...2014-01-01
58 Henderson, Thomas C.Received signal strength based bearing-only robot navigation in a sensor network fieldThis paper presents a low-complexity, novel approach to wireless sensor network (WSN) assisted autonomous mobile robot (AMR) navigation. The goal is to have an AMR navigate to a target location using only the information inherent to WSNs, i.e., topology of the WSN and received signal strength (RSS) ...2014-01-01
59 Hansen, Charles D.Boundary aware reconstruction of scalar fieldsIn visualization, the combined role of data reconstruction and its classification plays a crucial role. In this paper we propose a novel approach that improves classification of different materials and their boundaries by combining information from the classifiers at the reconstruction stage. Our ap...2014-01-01
60 Simpson, Jamesina J.Super-enhanced optical energy concentration through a subwavelength aperture using a photonic nanojetOptical transmission through resonant subwavelength apertures in optically thick metal films have received an explosion of interest for their ability to overcome the diffraction limit of light and concentrate light efficiently into a subwavelength volume. This achievement has attracted the use of su...2014-01-01
61 Simpson, Jamesina J.An efficient stochastic approach to uncertainty quantification in 3-D FDTD magnetized cold plasmaAn efficient stochastic finite-difference time-domain (S-FDTD) method is developed to analyze electromagnetic field variability in three dimensional anisotropic magnetized plasma. The new S-FDTD plasma model provides a full understanding of the true physics due to the associated uncertainties and ha...2014-01-01
62 Whitaker, Ross T.Curve boxplot: Generalization of boxplot for ensembles of curvesIn simulation science, computational scientists often study the behavior of their simulations by repeated solutions with variations in parameters and/or boundary values or initial conditions. Through such simulation ensembles, one can try to understand or quantify the variability or uncertainty in a...2014-01-01
63 Blair, StevenImplantable glass optrodes for deep-tissue light delivery3D needle-type glass waveguide arrays were developed as potentially compact neural interfaces for light delivery in deep-tissue. As much as 90% of input light is transmitted via a single optrode to depths >1mm in tissue. Light emission profiles from the optrode tips into tissue can exhibit beam widt...2014-01-01
64 Myers, Chris J.LEMA: A tool for the formal verification of digitally-intensive analog/mixed-signal circuitsThe increasing integration of analog/mixed-signal (AMS) circuits into system designs has further complicated an already difficult verification problem. Recently, formal verification, which has been successful in the purely digital domain, has made some in-roads in the AMS domain. This paper describe...2014-01-01
65 Liu, FengPrediction of a Dirac state in monolayer TiB2We predict the existence of a Dirac state in a monolayer TiB2 sheet (m-TiB2), a two-dimensionalmetal diboride, based on first-principles calculations. The band structure of m-TiB2 is found to be characterized with anisotropic Dirac cones with the largest Fermi velocity of 0.57 × 106 m/s, which is a...2014-01-01
66 Liu, FengEpitaxial growth of large-gap quantum spin Hall insulator on semiconductor surface : The substrate orbital filtering effectFormation of topological quantum phase on conventional semiconductor surface is of both scientific and technological interest. Here, we demonstrate epitaxial growth of 2D topological insulator, i.e. quantum spin Hall (QSH) state, on Si(111) surface with a large energy gap, based on first-principles ...2014-01-01
67 Furse, Cynthia M.Learning to teach in the flipped classroomThe flipped classroom has gained tremendous recent popularity. This paper reports on a new faculty training program for helping and mentoring faculty to learn to teach with the flipped classroom. Several modules were piloted in 2013-2014, including active teaching, how to create video lectures, cont...2014-01-01
68 Liu, FengGiant room-temperature spin caloritronics in spin-semiconducting graphene nanoribbonsSpin caloritronics refers to generating spin current by thermal gradient. Here we report a theoretical study demonstrating giant spin caloritronic effects in a new class of materials, called spin semiconductors, which are characterized with a "spin gap," the energy gap between spin-up and -down chan...2014-01-01
69 Furse, Cynthia M.A history & future of implantable antennasImplantable antennas have been used for communication with medical implants for decades. This paper traces their roots from early transcutaneous inductively coupled devices to the microstrip and wire antennas in use today. A suggestion for where this technology may go in the future as medical device...2014-01-01
70 Furse, Cynthia M.Analysis of electromagnetic field variability in magnetized ionosphere plasma using the stochastic FDTD methodA stochastic finite-difference time-domain (S-FDTD) algorithm is presented for electromagnetic wave propagation in anisotropic magnetized plasma. This new algorithm efficiently calculates in a single simulation not only the mean electromagnetic field values, but also their variance as caused by the ...2014-01-01
71 Furse, Cynthia M.Scaling the response of nanocrescent antennas into the ultravioletWe investigate the scaling of nanocrescent antennas for applications at UV wavelengths. These antennas have been extensively studied at infrared wavelengths due to their relative ease of fabrication [1] and tunability [2] via nanosphere template lithography. Their response at UV wavelengths, however...2014-01-01
72 Furse, Cynthia M.A tutorial on Stochastic FDTDThe Stochastic FDTD (S-FDTD) method provides a way to determine the mean and variance of the electric and magnetic fields in a model where the electrical properties (conductivity and permittivity) vary stochastically, from a single S-FDTD simulation. This method is a realistic and more efficient alt...2014-01-01
73 Kasera, Sneha K.Violating privacy through walls by passive monitoring of radio windowsWe investigate the ability of an attacker to passively use an otherwise secure wireless network to detect moving people through walls. We call this attack on privacy of people a "monitoring radio windows" (MRW) attack. We design and implement the MRW attack methodology to reliably detect when a pers...2014-01-01
74 Tiwari, AshutoshManifestation of two-channel nonlocal spin transport in the shapes of Hanle curvesThe dynamics of charge-density fluctuations in a system of two tunnel-coupled wires contains two diffusion modes with dispersion iω = Dq2 and iω = Dq2 + 2τt, where D is the diffusion coefficient and τt is the tunneling time between the wires. The dispersion of corresponding spin-density modes de...2014-01-01
75 Riloff, Ellen M.Domain-specific coreference resolution with lexicalized featuresMost coreference resolvers rely heavily on string matching, syntactic properties, and semantic attributes of words, but they lack the ability to make decisions based on individual words. In this paper, we explore the benefits of lexicalized features in the setting of domain-specific coreference reso...2014-01-01
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