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2013

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Librarians In Your Midst: The Embedded Librarian Program At Pvcc, Laura C. Skinner Jan 2013

Librarians In Your Midst: The Embedded Librarian Program At Pvcc, Laura C. Skinner

Inquiry: The Journal of the Virginia Community Colleges

The easy availability of Internet information has caused many to question the future of libraries. However, librarians, as experts of information science, are even more necessary to help students navigate the Internet. An embedded librarian provides assistance at the most critical point – exactly when it is needed.

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Partnership For Math Success: Development Of A Mathematics Readiness Class For High School Students, Yvonne Jessee Jan 2013

Partnership For Math Success: Development Of A Mathematics Readiness Class For High School Students, Yvonne Jessee

Inquiry: The Journal of the Virginia Community Colleges

To implement the developmental mathematics redesign, this author’s College partnered with two public school systems to establish early placement testing and a capstone readiness course, to be administered in the high school students’ senior year.

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The Mechanism Of Photo-Hydrosilylation On Silicon And Porous Silicon Surfaces, Kurt W. Kolasinski Jan 2013

The Mechanism Of Photo-Hydrosilylation On Silicon And Porous Silicon Surfaces, Kurt W. Kolasinski

Chemistry Faculty Publications

No abstract provided.

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Measure-Dependent Stochastic Nonlinear Beam Equations Driven By Fractional Brownian Motion, Mark A. Mckibben Jan 2013

Measure-Dependent Stochastic Nonlinear Beam Equations Driven By Fractional Brownian Motion, Mark A. Mckibben

Mathematics Faculty Publications

We study a class of nonlinear stochastic partial differential equations arising in themathematicalmodeling of the transverse motion of an extensible beam in the plane. Nonlinear forcing terms of functional-type and those dependent upon a family of probability measures are incorporated into the initial-boundary value problem (IBVP), and noise is incorporated into the mathematical description of the phenomenon via a fractional Brownian motion process. The IBVP is subsequently reformulated as an abstract second-order stochastic evolution equation driven by a fractional Brownian motion (fBm) dependent upon a family of probability measures in a real separableHilbert space and is studied using the tools …

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Control, Stability, And Qualitative Theory Of Dynamical Systems, Nazim Idrisoglu Mahmudov, Mark A. Mckibben, Sakthivel Rathinasamy, Yong Ren Jan 2013

Control, Stability, And Qualitative Theory Of Dynamical Systems, Nazim Idrisoglu Mahmudov, Mark A. Mckibben, Sakthivel Rathinasamy, Yong Ren

Mathematics Faculty Publications

No abstract provided.

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Geoscience And Geoscience Education In A Sustainable World, Tim Lutz Jan 2013

Geoscience And Geoscience Education In A Sustainable World, Tim Lutz

Earth & Space Sciences Faculty Publications

No abstract provided.

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Efficient Alignment Of Rna Secondary Structures Using Sparse Dynamic Programming, Cuncong Zhong, Shaojie Zhang Jan 2013

Efficient Alignment Of Rna Secondary Structures Using Sparse Dynamic Programming, Cuncong Zhong, Shaojie Zhang

Faculty Bibliography 2010s

Background: Current advances of the next-generation sequencing technology have revealed a large number of un-annotated RNA transcripts. Comparative study of the RNA structurome is an important approach to assess their biological functionalities. Due to the large sizes and abundance of the RNA transcripts, an efficient and accurate RNA structure-structure alignment algorithm is in urgent need to facilitate the comparative study. Despite the importance of the RNA secondary structure alignment problem, there are no computational tools available that provide high computational efficiency and accuracy. In this case, designing and implementing such an efficient and accurate RNA secondary structure alignment algorithm is …

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Thermal Emission At 3.6-8 Mu M From Wasp-19b: A Hot Jupiter Without A Stratosphere Orbiting An Active Star, D. R. Anderson, A. M. S. Smith, N. Madhusudhan, P. J. Wheatley, A. Collier Cameron, C. Hellier, C. Campo, M. Gillon, Joseph Harrington, P. F. L. Maxted, D. Pollacco, D. Queloz, B. Smalley, A. H. M. J. Triaud, R. G. West Jan 2013

Thermal Emission At 3.6-8 Mu M From Wasp-19b: A Hot Jupiter Without A Stratosphere Orbiting An Active Star, D. R. Anderson, A. M. S. Smith, N. Madhusudhan, P. J. Wheatley, A. Collier Cameron, C. Hellier, C. Campo, M. Gillon, Joseph Harrington, P. F. L. Maxted, D. Pollacco, D. Queloz, B. Smalley, A. H. M. J. Triaud, R. G. West

Faculty Bibliography 2010s

We report detection of thermal emission from the exoplanet WASP-19b at 3.6, 4.5, 5.8 and 8.0 mu m. We used the InfraRed Array Camera on the Spitzer Space Telescope to observe two occultations of WASP-19b by its host star. We combine our new detections with previous measurements of WASP-19b's emission at 1.6 and 2.09 mu m to construct a spectral energy distribution of the planet's dayside atmosphere. By comparing this with model-atmosphere spectra, we find that the dayside atmosphere of WASP-19b lacks a strong temperature inversion. As WASP-19 is an active star (log R'(HK) = -4.50 +/- 0.03), this finding …

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Well-Posed And Ill-Posed Boundary Value Problems For Pde 2013, Allaberen Ashyralyev, Sergey Piskarev, Valery Covachev, Ravshan Ashurov, Hasan Ali Yurtsever, Abdullah Said Erdogan Jan 2013

Well-Posed And Ill-Posed Boundary Value Problems For Pde 2013, Allaberen Ashyralyev, Sergey Piskarev, Valery Covachev, Ravshan Ashurov, Hasan Ali Yurtsever, Abdullah Said Erdogan

Faculty Bibliography 2010s

No abstract provided.

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Centaurs And Scattered Disk Objects In The Thermal Infrared: Analysis Of Wise-Neowise Observations, James M. Bauer, Tommy Grav, Erin Blauvelt, A. K. Mainzer, Joseph R. Masiero, Rachel Stevenson, Emily Kramer, Yan R. Fernández, C. M. Lisse, Roc M. Cutri, Paul R. Weissman, John W. Dailey, Frank J. Masci, Russel Walker, Adam Waszczak, Carrie R. Nugent, Karen J. Meech, Andrew Lucas, George Pearman, Ashlee Wilkins, Jessica Watkins, Shrinivas Kulkarni, Edward L. Wright Jan 2013

Centaurs And Scattered Disk Objects In The Thermal Infrared: Analysis Of Wise-Neowise Observations, James M. Bauer, Tommy Grav, Erin Blauvelt, A. K. Mainzer, Joseph R. Masiero, Rachel Stevenson, Emily Kramer, Yan R. Fernández, C. M. Lisse, Roc M. Cutri, Paul R. Weissman, John W. Dailey, Frank J. Masci, Russel Walker, Adam Waszczak, Carrie R. Nugent, Karen J. Meech, Andrew Lucas, George Pearman, Ashlee Wilkins, Jessica Watkins, Shrinivas Kulkarni, Edward L. Wright

Faculty Bibliography 2010s

The Wide-field Infrared Survey Explorer (WISE) observed 52 Centaurs and scattered disk objects (SDOs) in the thermal infrared, including 15 new discoveries. We present analyses of these observations to estimate sizes and mean optical albedos. We find mean albedos of 0.08 +/- 0.04 for the entire data set. Thermal fits yield average beaming parameters of 0.9 +/- 0.2 that are similar for both SDO and Centaur sub-classes. Biased cumulative size distributions yield size-frequency distribution power law indices of similar to-1.7 +/- 0.3. The data also reveal a relation between albedo and color at the 3 sigma level. No significant relation …

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Evaluating The Effect Of Partial Contributing Storage On The Storage-Discharge Function From Recession Analysis, X. Chen, D. Wang Jan 2013

Evaluating The Effect Of Partial Contributing Storage On The Storage-Discharge Function From Recession Analysis, X. Chen, D. Wang

Faculty Bibliography 2010s

Hydrograph recession during dry periods has been used to construct water storage-discharge relationships and to quantify storage dynamics and evaporation when streamflow data is available. However, variable hydrologic connectivity among hillslope-riparian-stream zones may affect the lumped storage-discharge relationship, and as a result, affect the estimation of evaporation and storage change. Given observations of rainfall and runoff, and remote-sensing-based observations of evaporation, the ratio (alpha) between estimated daily evaporation from recession analysis and observed evaporation, and the ratio (beta) between estimated contributing storage and total watershed storage are computed for 9 watersheds located in different climate regions. Both evaporation and storage …

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Crystallographic Anisotropy Of The Resistivity Size Effect In Single Crystal Tungsten Nanowires, Dooho Choi, Matthew Moneck, Xuan Liu, Soong Ju Oh, Cherie R. Kagan, Kevin R. Coffey, Katayun Barmak Jan 2013

Crystallographic Anisotropy Of The Resistivity Size Effect In Single Crystal Tungsten Nanowires, Dooho Choi, Matthew Moneck, Xuan Liu, Soong Ju Oh, Cherie R. Kagan, Kevin R. Coffey, Katayun Barmak

Faculty Bibliography 2010s

This work demonstrates an anisotropic increase in resistivity with decreasing width in single crystal tungsten (W) nanowires having a height of 21 nm. Nanowire-widths were in the range of 15-451 nm, with the anisotropy observed for widths below 50 nm. The longitudinal directions of the nanowires coincided with the < 100 >, < 110 > and < 111 > orientations of the body centered cubic phase of W. The resistivity increase was observed to be minimized for the < 111 > -oriented single crystal nanowires, exhibiting a factor of two lower increase in resistivity at a width of similar to 15 nm, relative to the thin film resistivity (i.e., an infinitely …

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Mmp-3 Contributes To Nigrostriatal Dopaminergic Neuronal Loss, Bbb Damage, And Neuroinflammation In An Mptp Mouse Model Of Parkinson's Disease, Young Cheul Chung, Yoon-Seong Kim, Eugene Bok, Tae Young Yune, Sungho Maeng, Byung Kwan Jin Jan 2013

Mmp-3 Contributes To Nigrostriatal Dopaminergic Neuronal Loss, Bbb Damage, And Neuroinflammation In An Mptp Mouse Model Of Parkinson's Disease, Young Cheul Chung, Yoon-Seong Kim, Eugene Bok, Tae Young Yune, Sungho Maeng, Byung Kwan Jin

Faculty Bibliography 2010s

The present study examined whether matrix metalloproteinase-3 (MMP-3) participates in the loss of dopaminergic (DA) neurons in the nigrostriatal pathway in a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) mouse model of Parkinson's disease with blood brain barrier (BBB) damage and infiltration of peripheral immune cells. Tyrosine hydroxylase (TH) immunostaining of brain sections from MPTP-treated mice showed that MPTP induced significant degeneration of nigrostriatal DA neurons. Moreover, FITC-labeled albumin detection and immunostaining revealed that MPTP caused damage to the BBB and increased the number of ED-1- and CD-3-immunopositive cells in the substantia nigra (SN). Genetic ablation of MMP-3 reduced the nigrostriatal DA neuron loss and …

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Isospectral Measures, Dorin Ervin Dutkay, Palle E.T. Jorgensen Jan 2013

Isospectral Measures, Dorin Ervin Dutkay, Palle E.T. Jorgensen

Faculty Bibliography 2010s

In recent papers a number of authors have considered Borel probability measures mu in R-d such that the Hilbert space L-2(mu) has a Fourier basis (orthogonal) of complex exponentials. If mu satisfies this property, the set of frequencies in this set is called a spectrum for mu. Here we fix a spectrum, say G, and we study the possibilities for measures mu having G as spectrum.

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Edge Dominating Sets And Vertex Covers, Ronald Dutton, William F. Klostermeyer Jan 2013

Edge Dominating Sets And Vertex Covers, Ronald Dutton, William F. Klostermeyer

Faculty Bibliography 2010s

Bipartite graphs with equal edge domination number and maximum matching cardinality are characterized. These two parameters are used to develop bounds on the vertex cover and total vertex cover numbers of graphs and a resulting chain of vertex covering, edge domination, and matching parameters is explored. In addition, the total vertex cover number is compared to the total domination number of trees and grid graphs.

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Mobility Transition From Ballistic To Diffusive Transport In Non-Hermitian Lattices, T. Eichelkraut, R. Heilmann, S. Weimann, Simon Stützer, Felix Dreisow, Demetrios N. Christodoulides, Stefan Nolte, Alexander Szameit Jan 2013

Mobility Transition From Ballistic To Diffusive Transport In Non-Hermitian Lattices, T. Eichelkraut, R. Heilmann, S. Weimann, Simon Stützer, Felix Dreisow, Demetrios N. Christodoulides, Stefan Nolte, Alexander Szameit

Faculty Bibliography 2010s

Within all physical disciplines, it is accepted that wave transport is predetermined by the existence of disorder. In this vein, it is known that ballistic transport is possible only when a structure is ordered, and that disorder is crucial for diffusion or (Anderson-)localization to occur. As this commonly accepted picture is based on the very foundations of quantum mechanics where Hermiticity of the Hamiltonian is naturally assumed, the question arises whether these concepts of transport hold true within the more general context of non-Hermitian systems. Here we demonstrate theoretically and experimentally that in ordered time-independent PT-symmetric systems, which are symmetric …

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Seasonality Influences Cuticle Melanization And Immune Defense In A Cricket: Support For A Temperature-Dependent Immune Investment Hypothesis In Insects, Kenneth M. Fedorka, Emily K. Copeland, Wade E. Winterhalter Jan 2013

Seasonality Influences Cuticle Melanization And Immune Defense In A Cricket: Support For A Temperature-Dependent Immune Investment Hypothesis In Insects, Kenneth M. Fedorka, Emily K. Copeland, Wade E. Winterhalter

Faculty Bibliography 2010s

To improve thermoregulation in colder environments, insects are expected to darken their cuticles with melanin via the phenoloxidase cascade, a phenomenon predicted by the thermal melanin hypothesis. However, the phenoloxidase cascade also plays a significant role in insect immunity, leading to the additional hypothesis that the thermal environment indirectly shapes immune function via direct selection on cuticle color. Support for the latter hypothesis comes from the cricket Allonemobius socius, where cuticle darkness and immune-related phenoloxidase activity increase with latitude. However, thermal environments vary seasonally as well as geographically, suggesting that seasonal plasticity in immunity may also exist. Although seasonal fluctuations …

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Helicobacter Pylori Infection And Light Chain Gammopathy, José A. Girón, Shawn L. Shah Jan 2013

Helicobacter Pylori Infection And Light Chain Gammopathy, José A. Girón, Shawn L. Shah

Faculty Bibliography 2010s

Objective. Helicobacter pylori provokes a host of immune alterations upon colonizing the gastric mucosa. Design. We report 22 individuals with confirmed Helicobacter pylori infection who were also managed for the concurrent elevation of immunoglobulin free light chain (kappa and lambda) levels. Result. Of the 22 patients, 15 patients (68.2%) had elevated free light chain levels: 6 patients (40%) had only kappa chain elevation, 2 patients (13.3%) had only lambda chain elevation, and 7 patients (46.7%) had both kappa and lambda chain elevation. Twenty out of the 22 patients (90.9%) were microbiologically confirmed cured with 3 patients being lost to follow-up …

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Shockwave Based Nonlinear Optical Manipulation In Densely Scattering Opaque Suspensions, Elad Greenfield, Jonathan Nemirovsky, Ramy El-Ganainy, Demetri N. Christodoulides, Mordechai Segev Jan 2013

Shockwave Based Nonlinear Optical Manipulation In Densely Scattering Opaque Suspensions, Elad Greenfield, Jonathan Nemirovsky, Ramy El-Ganainy, Demetri N. Christodoulides, Mordechai Segev

Faculty Bibliography 2010s

Optical manipulation of particulate-loaded, highly scattering (opaque) suspensions is considered impossible. Here we demonstrate theoretically and experimentally optical manipulation of the local properties of such opaque suspensions. We show that the optical forces exerted by multiply-scattered light give rise to dense shock fronts of particle concentration, propagating deep inside the opaque suspensions, where the optical field is completely diffuse. We exploit these waves to demonstrate a plethora of optofluidic manipulations, ranging from optical transport and concentration of large populations of nanoparticles, to light-induced 'writing' of concentrated spots in the suspensions and light-induced phase-transition from suspension to gel in localized volumes …

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Silicon-In-Silica Spheres Via Axial Thermal Gradient In-Fibre Capillary Instabilities, Alexander Gumennik, Lei Wei, Guillaume Lestoquoy, Alexander M. Stolyarov, Xiaoting Jia, Paul H. Rekemeyer, Matthew J. Smith, Xiangdong Liang, Benjamin J.-B. Grena, Steven G. Johnson, Silvija Gradečak, Ayman F. Abouraddy, John D. Joannopoulos, Yoel Fink Jan 2013

Silicon-In-Silica Spheres Via Axial Thermal Gradient In-Fibre Capillary Instabilities, Alexander Gumennik, Lei Wei, Guillaume Lestoquoy, Alexander M. Stolyarov, Xiaoting Jia, Paul H. Rekemeyer, Matthew J. Smith, Xiangdong Liang, Benjamin J.-B. Grena, Steven G. Johnson, Silvija Gradečak, Ayman F. Abouraddy, John D. Joannopoulos, Yoel Fink

Faculty Bibliography 2010s

The ability to produce small scale, crystalline silicon spheres is of significant technological and scientific importance, yet scalable methods for doing so have remained elusive. Here we demonstrate a silicon nanosphere fabrication process based on an optical fibre drawing technique. A silica-cladded silicon-core fibre with diameters down to 340 nm is continuously fed into a flame defining an axial thermal gradient and the continuous formation of spheres whose size is controlled by the feed speed is demonstrated. In particular, spheres of diameter < 500 nm smaller than those produced under isothermal heating conditions are shown and analysed. A fibre with dual cores, p-type and n-type silicon, is drawn and processed into spheres. Spatially coherent break-up leads to the joining of the spheres into a bispherical silicon 'p-n molecule'. The resulting device is measured to reveal a rectifying I-V curve consistent with the formation of a p-n junction.

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Acceleration Of Computation Of Phi-Polynomials, Ilhan Kaya, Jannick Rolland Jan 2013

Acceleration Of Computation Of Phi-Polynomials, Ilhan Kaya, Jannick Rolland

Faculty Bibliography 2010s

The benefits of making an effective use of impressive computational power offered by multi-core platforms are investigated for the computation of phi-polynomials used in the description of freeform surfaces. Specifically, we devise parallel algorithms based upon the recurrence relations of both Zernike polynomials and gradient orthogonal Q-polynomials and implement these parallel algorithms on Graphical Processing Units (GPUs) respectively. The results show that more than an order of magnitude improvement is achieved in computational time over a sequential implementation if these recurrence-based parallel algorithms are adopted in the computation of the phi-polynomials.

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On A Calderon Problem In Frequency Differential Electrical Impedance Tomography, Sungwhan Kim, Alexandru Tamasan Jan 2013

On A Calderon Problem In Frequency Differential Electrical Impedance Tomography, Sungwhan Kim, Alexandru Tamasan

Faculty Bibliography 2010s

Recent research in electrical impedance tomography produced images of biological tissue from frequency differential boundary voltages and corresponding currents. Physically one is to recover the electrical conductivity sigma and permittivity c from the frequency differential boundary data. Let gamma = sigma+iota omega is an element of denote the complex admittivity, Lambda(gamma) be the corresponding Dirichlet-to-Neumann map, and d Lambda(gamma)/d omega|omega=0 be its frequency differential at omega = 0. If sigma is an element of C-1,C-1 ((Omega) over bar) is constant near the boundary and is an element of is an element of C-0(1,1) (Omega), we show that d Lambda(gamma)/d omega|omega=0 …

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Non-Asymptotic Approach To Varying Coefficient Model, Olga Klopp, Marianna Pensky Jan 2013

Non-Asymptotic Approach To Varying Coefficient Model, Olga Klopp, Marianna Pensky

Faculty Bibliography 2010s

In the present paper we consider the varying coefficient model which represents a useful tool for exploring dynamic patterns in many applications. Existing methods typically provide asymptotic evaluation of precision of estimation procedures under the assumption that the number of observations tends to infinity. In practical applications, however, only a finite number of measurements are available. In the present paper we focus on a non-asymptotic approach to the problem. We propose a novel estimation procedure which is based on recent developments in matrix estimation. In particular, for our estimator, we obtain upper bounds for the mean squared and the pointwise …

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Laser-Controlled Rotational Cooling Of Na-2 Based On Exceptional Points, Viatcheslav Kokoouline, A. Wearne, R. Lefebvre, O. Atabek Jan 2013

Laser-Controlled Rotational Cooling Of Na-2 Based On Exceptional Points, Viatcheslav Kokoouline, A. Wearne, R. Lefebvre, O. Atabek

Faculty Bibliography 2010s

Exceptional points (EPs) corresponding to resonance coalescence (i.e., complex energy degeneracy and identical wave functions) occur in many areas of non-Hermitian physics and, in particular, in laser-induced molecular dynamics for specific choices of two control parameters. We have previously shown [Atabek, et al., Phys. Rev. Lett. 106, 173002 (2011)] how these control parameters, namely, the wavelength and the intensity of the external field, have to be tuned to take advantage of EPs for selective vibrational transfers within a reduced one-dimensional model describing a diatomic molecule with frozen rotation. Moreover, the possibility offered by such transfers to adiabatically transport all the …

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Virtual Hyperbolic Metamaterials For Manipulating Radar Signals In Air, Zhaxylyk A. Kudyshev, Martin C. Richardson, Natalia M. Litchinitser Jan 2013

Virtual Hyperbolic Metamaterials For Manipulating Radar Signals In Air, Zhaxylyk A. Kudyshev, Martin C. Richardson, Natalia M. Litchinitser

Faculty Bibliography 2010s

Microwave beam transmission and manipulation in the atmosphere is an important but difficult task. One of the major challenges in transmitting and routing microwaves in air is unavoidable divergence because of diffraction. Here we introduce and design virtual hyperbolic metamaterials (VHMMs) formed by an array of plasma channels in air as a result of self-focusing of an intense laser pulse, and show that such structure can be used to manipulate microwave beams in air. Hyperbolic, or indefinite, metamaterials are photonic structures that possess permittivity and/or permeability tensor elements of opposite sign with respect to one another along principal axes, resulting …

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Stationary Solutions For The 1+1 Nonlinear Schrodinger Equation Modeling Repulsive Bose-Einstein Condensates In Small Potentials, Kristina Mallory, Robert A. Van Gorder Jan 2013

Stationary Solutions For The 1+1 Nonlinear Schrodinger Equation Modeling Repulsive Bose-Einstein Condensates In Small Potentials, Kristina Mallory, Robert A. Van Gorder

Faculty Bibliography 2010s

Stationary solutions for the 1 + 1 cubic nonlinear Schrodinger equation modeling repulsive Bose-Einstein condensates (BEC) in a small potential are obtained through a form of nonlinear perturbation. In particular, for sufficiently small potentials, we determine the perturbation theory of stationary solutions, by use of an expansion in Jacobi elliptic functions. This idea was explored before in order to obtain exact solutions [Bronski, Carr, Deconinck, and Kutz, Phys. Rev. Lett. 86, 1402 (2001)], where the potential itself was fixed to be a Jacobi elliptic function, thereby reducing the nonlinear ODE into an algebraic equation, (which could be easily solved). However, …

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Supersymmetry-Generated Complex Optical Potentials With Real Spectra, Mohammad-Ali Miri, Matthias Heinrich, Demetrios N. Christodoulides Jan 2013

Supersymmetry-Generated Complex Optical Potentials With Real Spectra, Mohammad-Ali Miri, Matthias Heinrich, Demetrios N. Christodoulides

Faculty Bibliography 2010s

We show that the formalism of supersymmetry (SUSY), when applied to parity-time (PT) symmetric optical potentials, can give rise to refractive index landscapes with altogether nontrivial properties. In particular, we find that the presence of gain and loss allows for arbitrarily removing bound states from the spectrum of a structure. This is in stark contrast to the Hermitian case, where the SUSY formalism can only address the fundamental mode of a potential. Subsequently we investigate isospectral families of complex potentials that exhibit entirely real spectra, despite the fact that their shapes violate PT symmetry. Finally, the role of SUSY transformations …

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Enhanced Design Of Narrowband Filters Based On The Extraordinary Transmission Through Single Fishnet Structures, Nicholas S. Nye, Alexandros I. Dimitriadis, Nikolaos V. Kantartzis, Theodoros D. Tsiboukis Jan 2013

Enhanced Design Of Narrowband Filters Based On The Extraordinary Transmission Through Single Fishnet Structures, Nicholas S. Nye, Alexandros I. Dimitriadis, Nikolaos V. Kantartzis, Theodoros D. Tsiboukis

Faculty Bibliography 2010s

A systematic method for the efficient design of narrowband filters founded on the extraordinary transmission via single fishnet structures (SFSs) is presented in this paper. Essentially, due to its strong resonant behavior, this phenomenon is proven suitable for the implementation of high-Q devices. The new design formulas are derived through the combination of full-wave numerical simulations and curve fitting algorithms. Also, adequate mathematical criteria are defined for the evaluation of the filters' linear performance, indicating that the transmitted electromagnetic waves remain practically undistorted in the frequency band of interest. Then, by exploiting the previously developed relations, proper correction factors are …

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Defense Against Sybil Attack In The Initial Deployment Stage Of Vehicular Ad Hoc Network Based On Roadside Unit Support, Soyoung Park, Baber Aslam, Damla Turgut, Cliff C. Zou Jan 2013

Defense Against Sybil Attack In The Initial Deployment Stage Of Vehicular Ad Hoc Network Based On Roadside Unit Support, Soyoung Park, Baber Aslam, Damla Turgut, Cliff C. Zou

Faculty Bibliography 2010s

In this paper, we propose two certificate mechanisms for preventing the Sybil attack in a vehicular ad hoc network (VANET): the timestamp series approach and the temporary certificate approach. We focus on an early-stage VANET when the number of smart vehicles is only a small fraction of the vehicles on the road and the only infrastructure components available are the roadside units (RSUs). Our approach does not require a dedicated vehicular public key infrastructure to certify individual vehicles but RSUs are the only components issuing certificates. The vehicles can obtain certificates by simply driving by RSUs, without the need to …

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Perfect Transfer Of Path-Entangled Photons In J(X) Photonic Lattices, Armando Perez-Leija, Robert Keil, Hector Moya-Cessa, Alexander Szameit, Demetrios N. Christodoulides Jan 2013

Perfect Transfer Of Path-Entangled Photons In J(X) Photonic Lattices, Armando Perez-Leija, Robert Keil, Hector Moya-Cessa, Alexander Szameit, Demetrios N. Christodoulides

Faculty Bibliography 2010s

We demonstrate that perfect transfer of path-entangled photons as well as of single-photon states is possible in a certain class of spin inspired optical systems-the so-called J(x) photonic lattices. In these fully integrable optical arrangements, perfect cyclic transitions from correlated states to totally anticorrelated states can naturally occur. Moreover we show that the bunching and antibunching response of path-entangled photons can be preengineered at will in such coupled optical arrangements. We elucidate these effects via pertinent examples.

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