Browsing College of Science (COS) by Title
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AcylHomoserine Lactone Recognition and Response Hindering the QuorumSensing Regulator EsaR
(Public Library of Science, 20140919)During quorum sensing in the plant pathogen Pantoea stewartii subsp. stewartii, EsaI, an acylhomoserine lactone (AHL) synthase, and the transcription factor EsaR coordinately control capsular polysaccharide production. ... 
Adapting to Symptoms of Global Warming Rather Than Addressing the Cause
(Virginia Tech, 20140122)In recent years, global warming has been ignored and scientists producing evidence supporting this hypothesis have been denigrated and even investigated. However, as irrefutable evidence showing that global warming was a ... 
Aging in coarsening diluted ferromagnets
(American Physical Society, 201010)We comprehensively study nonequilibrium relaxation and aging processes in the twodimensional randomsite Ising model through numerical simulations. We discuss the dynamical correlation length as well as scaling functions ... 
Aging processes in systems with anomalous slow dynamics
(American Physical Society, 20130114)Recently, different numerical studies of coarsening in disordered systems have shown the existence of a crossover from an initial, transient, powerlaw domain growth to a slower, presumably logarithmic, growth. However, ... 
algal periphyton growth on nutrientdiffusing substrates: an in situ bioassay
(Ecological Society of America, 1985)Differences in nutrient limitation for dominant species within an algal periphyton community were determined using additions of N and P supplied by nutrientdiffusing artificial substrates. Sealed clay flowerpots were ... 
alphastates in de Sitter space
(American Physical Society, 200502)Field theory in de Sitter space admits a oneparameter family of vacua determined by a superselection parameter alpha. Of these vacua, the Euclidean vacuum uniquely extrapolates to the vacuum of flat Minkowski space. States ... 
Aluminum plasmonic nanostructures for improved absorption in organic photovoltaic devices
(AIP Publishing, 201103)We model the absorption enhancement in organic photovoltaic devices induced by incorporating Al, Ag, and Au nanoparticles in the active layer. We find that Al nanoparticles should yield significantly greater enhancement ... 
An atomic force microscope tip as a light source
(AIP Publishing, 200512)We present a simple method for causing the end of a silicon nitride atomic force microscope (AFM) tip to emit light, and we use this emitted light to perform scanning nearfield optical microscopy. Illumination of a silicon ... 
An effective method for parameter estimation with pde constraints with multiple righthand sides
(Siam Publications, 2012)Often, parameter estimation problems of parameterdependent PDEs involve multiple righthand sides. The computational cost and memory requirements of such problems increase linearly with the number of righthand sides. For ... 
An elementary nonlinear beam theory with finite buckling deformation properties
(Siam Publications, 200204)A simple nonlinear beam model is derived from basic principles. The assumption upon which the derivation is based is that axial motions are of second order compared with transverse motions of the beam. The existence of ... 
Analysis and approximation of the velocity tracking problem for NavierStokes flows with distributed control
(Siam Publications, 200005)We consider the mathematical formulation, analysis, and the numerical solution of a timedependent optimal control problem associated with the tracking of the velocity of a NavierStokes ow in a bounded twodimensional ... 
Analysis of a generic model of eukaryotic cellcycle regulation
(CELL PRESS, 200606)We propose a protein interaction network for the regulation of DNA synthesis and mitosis that emphasizes the universality of the regulatory system among eukaryotic cells. The idiosyncrasies of cell cycle regulation in ... 
Analysis of optical response of long period fiber gratings to nmthick thinfilm coatings
(Optical Society of America, 200504)We have theoretically and experimentally demonstrated that the resonant wavelength of long period fiber gratings (LPG) can be shifted by a large magnitude by coating with only a nmthickthinfilm that has a refractive index ... 
analysis of the dispersion function for anisotropic longitudinal plasmawaves
(AIP Publishing, 197910)An analysis of the zeros of the dispersion function for longitudinal plasma waves is made. In particular, the plasma equilibriumdistribution function is assumed to have two relative maxima and is not necessarily an even ... 
Analytic approximation to the groundstate energy of the Anderson model
(American Physical Society, 198809)Using the nonperturbative Lanczos recursion scheme an analytic approximation to the groundstate energy of the singleimpurity Anderson model is obtained. Calculations are carried out to a 5x5 matrix truncation. Comparisons ... 
analytic theory for the selection of a twodimensional needle crystal at arbitrary Péclet number
(American Physical Society, 198910)An accurate analytic theory is presented for the velocity selection of a twodimensional needle crystal for arbitrary Péclet number for small values of the surfacetension parameter. The velocity selection is caused by the ... 
analytical solutions of model equations for two phase gas mixtures: Transverse velocity perturbations
(AIP Publishing, 1984)Model equations for a dilute binary gas system are derived, using a linear BGK scheme. Complete analytical solutions for the stationary half_space problem are obtained for transverse velocity perturbations. The method of ... 
Annual Report 20052006 Department of Geosciences
(Department of Geosciences, 2006) 
Annual Report 20062007 Department of Geosciences
(Department of Geosciences, 2007) 
Annual Report 20082009 Department of Geosciences
(Department of Geosciences, 2009)