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1

Anderson localization in active arrays  

E-print Network

In a dissipationless linear lattice, spatial disorder induces localization of the lattice eigenstates and blocks spreading of wave packets. The addition of nonlinearity to the lattice Hamiltonian causes interaction between the eigenstates, which results in a slow packet spreading. We go beyond the disipationless limit and consider nonlinear disordered arrays that are subjected to the dissipative losses and energy pumping. We show that the Anderson modes of the disordered Ginsburg-Landau lattice possess excitation thresholds with respect to the pumping strength. When pumping is increased above the treshold for the band-edge modes, the lattice dynamics yields an attractor in the form of a stable multipeak pattern. The Anderson attractor is the result of a joint action by the pumping-induced mode excitation, nonlinearity-induced mode interactions, and dissipative stabilization. The regimes of Anderson attractors can be potentially realized with polariton condensates lattices and cavity-QED arrays.

T. V. Laptyeva; A. A. Tikhomirov; O. I. Kanakov; M. V. Ivanchenko

2014-10-22

2

Gravitational Anderson localization.  

PubMed

We present a higher dimensional model where gravity is bound to a brane due to Anderson localization. The extra dimensions are taken to be a disordered crystal of branes, with randomly distributed tensions of order the fundamental scale. Such geometries bind the graviton and thus allow for arbitrarily large extra dimensions even when the curvature is small. Thus this model is quite distinct from that of Randall and Sundrum where localization is a consequence of curvature effects in the bulk. The hierarchy problem can be solved by having the standard model brane live a distance away from the brane on which the graviton is localized. The statistical properties of the system are worked out and it is shown that the scenario leads to a continuum of four dimensional theories with differing strengths of gravitational interactions. We live on one particular brane whose gravitational constant is G(N). PMID:23383775

Rothstein, Ira Z

2013-01-01

3

Adatoms and Anderson localization in graphene  

NASA Astrophysics Data System (ADS)

We address the nature of the disordered state that results from the adsorption of adatoms in graphene. For adatoms that sit at the center of the honeycomb plaquette, as in the case of most transition metals, we show that the ones that form a zero-energy resonant state lead to Anderson localization in the vicinity of the Dirac point. Among those, we show that there is a symmetry class of adatoms where Anderson localization is suppressed, leading to an exotic metallic state with large and rare charge droplets, that localizes only at the Dirac point. We identify the experimental conditions for the observation of the Anderson transition for adatoms in graphene.

García, Jose H.; Uchoa, Bruno; Covaci, Lucian; Rappoport, Tatiana G.

2014-08-01

4

Anderson localization in QCD-like theories  

E-print Network

We review the present status of the Anderson transition in the spectrum of the Dirac operator of QCD-like theories on the lattice. Localized modes at the low-end of the spectrum have been found in SU(2) Yang-Mills theory with overlap and staggered valence fermions as well as in Nf=2+1 QCD with staggered quarks. We draw an analogy between the transition from localized to delocalized modes in the Dirac spectrum and the Anderson transition in electronic systems. The QCD transition turns out to be in the same universality class as the transition in the corresponding Anderson model. We also speculate on the possible physical relevance of this transition to QCD at high temperature and the possible finite temperature phase transition in QCD-like models with different fermion contents.

Matteo Giordano; Tamas G. Kovacs; Ferenc Pittler

2014-09-18

5

Anderson localization in QCD-like theories  

NASA Astrophysics Data System (ADS)

We review the present status of the Anderson transition in the spectrum of the Dirac operator of QCD-like theories on the lattice. Localized modes at the low end of the spectrum have been found in SU(2) Yang-Mills theory with overlap and staggered valence fermions as well as in Nf = 2+1 QCD with staggered quarks. We draw an analogy between the transition from localized to delocalized modes in the Dirac spectrum and the Anderson transition in electronic systems. The QCD transition turns out to be in the same universality class as the transition in the corresponding Anderson model. We also speculate on the possible physical relevance of this transition to QCD at high temperature and the possible finite temperature phase transition in QCD-like models with different fermion contents.

Giordano, Matteo; Kovács, Tamás G.; Pittler, Ferenc

2014-10-01

6

Low shear viscosity due to Anderson localization  

SciTech Connect

We study the Anderson localization effect on the shear viscosity in a system with random medium by Kubo formula. We show that this effect can suppress nonperturbatively the shear viscosity and other transport coefficients. The possible relevancy of such a suppression to the near perfect fluid behavior of the quark-gluon plasma created in heavy-ion collisions is discussed.

Giannakis, Ioannis [Physics Department, Rockefeller University, 1230 York Avenue, New York, New York 10021-6399 (United States); Hou Defu; Ren Haicang [Physics Department, Rockefeller University, 1230 York Avenue, New York, New York 10021-6399 (United States); Institute of Particle Physics, Huazhong Normal University, Wuhan, 430079 (China); Li Jiarong [Institute of Particle Physics, Huazhong Normal University, Wuhan, 430079 (China)

2008-01-15

7

ANDERSON LOCALIZATION OF ELECTROMAGNETIC WAVES IN CONFINED DISORDERED DIELECTRIC MEDIA  

E-print Network

ANDERSON LOCALIZATION OF ELECTROMAGNETIC WAVES IN CONFINED DISORDERED DIELECTRIC MEDIA MARIAN RUSEK, Poland 1. Introduction Scattering of electromagnetic waves from varoius kind of obstacles is rich experimental demonstration that Anderson localization of electromagnetic waves is possible in three

Rusek, Marian

8

Anderson localization in quark-gluon plasma.  

PubMed

At low temperature the low end of the QCD Dirac spectrum is well described by chiral random matrix theory. In contrast, at high temperature there is no similar statistical description of the spectrum. We show that at high temperature the lowest part of the spectrum consists of a band of statistically uncorrelated eigenvalues obeying essentially Poisson statistics and the corresponding eigenvectors are extremely localized. Going up in the spectrum the spectral density rapidly increases and the eigenvectors become more and more delocalized. At the same time the spectral statistics gradually crosses over to the bulk statistics expected from the corresponding random matrix ensemble. This phenomenon is reminiscent of Anderson localization in disordered conductors. Our findings are based on staggered Dirac spectra in quenched lattice simulations with the SU(2) gauge group. PMID:21231163

Kovács, Tamás G; Pittler, Ferenc

2010-11-01

9

Anderson Localization in Quark-Gluon Plasma  

SciTech Connect

At low temperature the low end of the QCD Dirac spectrum is well described by chiral random matrix theory. In contrast, at high temperature there is no similar statistical description of the spectrum. We show that at high temperature the lowest part of the spectrum consists of a band of statistically uncorrelated eigenvalues obeying essentially Poisson statistics and the corresponding eigenvectors are extremely localized. Going up in the spectrum the spectral density rapidly increases and the eigenvectors become more and more delocalized. At the same time the spectral statistics gradually crosses over to the bulk statistics expected from the corresponding random matrix ensemble. This phenomenon is reminiscent of Anderson localization in disordered conductors. Our findings are based on staggered Dirac spectra in quenched lattice simulations with the SU(2) gauge group.

Kovacs, Tamas G.; Pittler, Ferenc [Department of Physics, University of Pecs, H-7624 Pecs Ifjusag utja 6 (Hungary)

2010-11-05

10

Anderson Localization in Quark-Gluon Plasma  

E-print Network

At low temperature the low end of the QCD Dirac spectrum is well described by chiral random matrix theory. In contrast, at high temperature there is no similar statistical description of the spectrum. We show that at high temperature the lowest part of the spectrum consists of a band of statistically uncorrelated eigenvalues obeying essentially Poisson statistics and the corresponding eigenvectors are extremely localized. Going up in the spectrum the spectral density rapidly increases and the eigenvectors become more and more delocalized. At the same time the spectral statistics gradually crosses over to the bulk statistics expected from the corresponding random matrix ensemble. This phenomenon is reminiscent of Anderson localization in disordered conductors. Our findings are based on staggered Dirac spectra in quenched SU(2) lattice simulations.

Tamas G. Kovacs; Ferenc Pittler

2010-06-07

11

Microwave-Driven Atoms: From Anderson Localization to Einstein's Photoeffect  

SciTech Connect

We study the counterpart of Anderson localization in driven one-electron Rydberg atoms. By changing the initial Rydberg state at fixed microwave frequency and interaction time, we numerically monitor the crossover from Anderson localization to the photoeffect in the atomic ionization signal.

Schelle, Alexej [Physikalisches Institut der Albert-Ludwigs-Universitaet, Hermann-Herder-Strasse 3, D-79104 Freiburg (Germany); Laboratoire Kastler-Brossel, Universite Pierre et Marie Curie-Paris 6, ENS, CNRS, 4, Place Jussieu, F-75005 Paris (France); Delande, Dominique [Laboratoire Kastler-Brossel, Universite Pierre et Marie Curie-Paris 6, ENS, CNRS, 4, Place Jussieu, F-75005 Paris (France); Buchleitner, Andreas [Physikalisches Institut der Albert-Ludwigs-Universitaet, Hermann-Herder-Strasse 3, D-79104 Freiburg (Germany)

2009-05-08

12

Anderson localization casts clouds over adiabatic quantum optimization  

E-print Network

Understanding NP-complete problems is a central topic in computer science. This is why adiabatic quantum optimization has attracted so much attention, as it provided a new approach to tackle NP-complete problems using a quantum computer. The efficiency of this approach is limited by small spectral gaps between the ground and excited states of the quantum computer's Hamiltonian. We show that the statistics of the gaps can be analyzed in a novel way, borrowed from the study of quantum disordered systems in statistical mechanics. It turns out that due to a phenomenon similar to Anderson localization, exponentially small gaps appear close to the end of the adiabatic algorithm for large random instances of NP-complete problems. This implies that unfortunately, adiabatic quantum optimization fails: the system gets trapped in one of the numerous local minima.

Boris Altshuler; Hari Krovi; Jeremie Roland

2009-12-03

13

Strong Anderson localization in cold atom quantum quenches.  

PubMed

Signatures of Anderson localization in the momentum distribution of a cold atom cloud after a quantum quench are studied. We consider a quasi-one-dimensional cloud initially prepared in a well-defined momentum state, and expanding for some time in a disorder speckle potential. Quantum interference generates a peak in the forward scattering amplitude which, unlike the common weak localization backscattering peak, is a signature of strong Anderson localization. We present a nonperturbative, and fully time resolved description of the phenomenon, covering the entire diffusion-to-localization crossover. Our results should be observable by present day experiments. PMID:24702342

Micklitz, T; Müller, C A; Altland, A

2014-03-21

14

Strong Anderson Localization in Cold Atom Quantum Quenches  

NASA Astrophysics Data System (ADS)

Signatures of Anderson localization in the momentum distribution of a cold atom cloud after a quantum quench are studied. We consider a quasi-one-dimensional cloud initially prepared in a well-defined momentum state, and expanding for some time in a disorder speckle potential. Quantum interference generates a peak in the forward scattering amplitude which, unlike the common weak localization backscattering peak, is a signature of strong Anderson localization. We present a nonperturbative, and fully time resolved description of the phenomenon, covering the entire diffusion-to-localization crossover. Our results should be observable by present day experiments.

Micklitz, T.; Müller, C. A.; Altland, A.

2014-03-01

15

Anderson Localization for the Almost Mathieu Equation: A Nonperturbative Proof.  

E-print Network

Anderson Localization for the Almost Mathieu Equation: A Nonperturbative Proof. Svetlana Ya prove that for any diophantine rotation angle ! and a.e. phase ` the almost Mathieu operator (H­ physics. Moscow, Russia . 1 #12; 1. INTRODUCTION In this paper we study localization for the almost­Mathieu

16

1\\/f colouring of white noise by Anderson localization  

Microsoft Academic Search

A new mechanism for the appearance of 1\\/f noise in the phase of the reflection coefficient is described for disordered systems. It relies on the (1\\/d)-distribution of energy widths for Anderson localized states which is derived heuristically. Provided the incident wave packet is incoherent on a nonvanishing band width, the phase of the reflected wave exhibits intermittency with “bursts” characterized

D. Sornette

1987-01-01

17

Bootstrap multiscale analysis and localization for multi-particle continuous Anderson Hamiltonians  

E-print Network

We extend the bootstrap multiscale analysis developed by Germinet and Klein to the multi-particle continuous Anderson Hamiltonian, obtaining Anderson localization with finite multiplicity of eigenvalues, decay of eigenfunction correlations, and a strong form of dynamical localization.

Abel Klein; Son Nguyen

2013-11-17

18

Anderson Localization Enhanced Spin Selective Transport of Electrons in DNA  

NASA Astrophysics Data System (ADS)

Recent experiments revealed the unusual strong spin effects with high spin selective transmission of electrons in double-stranded DNA. We propose a new mechanism that the strong spin effects could be understood in terms of the combination of the chiral structure, spin-orbit coupling, and especially spin-dependent Anderson localization. The presence of chiral structure and spin-orbit coupling of DNA induce weak Fermi energy splitting between two spin polarization states. The intrinsic Anderson localization in generic DNA molecules may result in remarkable enhancement of the spin selective transport. In particular, these two spin states with energy splitting have different localization lengths. Spin up/down channel may have shorter/longer localization length so that relatively less/more spin up/down electrons may tunnel through the system. In addition, the strong length dependence of spin selectivity observed in experiments can be naturally understood. Anderson localization enhanced spin selectivity effect may provide a deeper understanding of spin-selective processes in molecular spintronics and biological systems.

Zhao, Fang; Meng, Qing-Qiang; Chen, Yan

2014-06-01

19

Nonreciprocal Anderson Localization in Magneto-Optical Random Structures  

E-print Network

We study, both analytically and numerically, disorder-induced localization of light in random layered structures with magnetooptical materials. The Anderson localization in such structures demonstrates nonreciprocal features in both the averaged localization length and individual transmission resonances. We employ short-wavelength approximation where the localization effects are strong, and consider both the Faraday and Voigt magnetooptical geometries. In the Faraday geometry, the transmission is strongly nonreciprocal for the circularly polarized waves, whereas in the Voigt geometry, the nonreciprocity is much weaker, and it may appear only for the individual transmission resonances of the TM-polarized waves.

Bliokh, K Y; Rajan, P; Shadrivov, I V; Kivshar, Y S

2011-01-01

20

Three-dimensional Anderson localization of ultracold matter.  

PubMed

Anderson localization (AL) is a ubiquitous interference phenomenon in which waves fail to propagate in a disordered medium. We observe three-dimensional AL of noninteracting ultracold matter by allowing a spin-polarized atomic Fermi gas to expand into a disordered potential. A two-component density distribution emerges consisting of an expanding mobile component and a nondiffusing localized component. We extract a mobility edge that increases with the disorder strength, whereas the thermally averaged localization length is shown to decrease with disorder strength and increase with particle energy. These measurements provide a benchmark for more sophisticated theories of AL. PMID:21980104

Kondov, S S; McGehee, W R; Zirbel, J J; DeMarco, B

2011-10-01

21

Zero-mean circular Bessel statistics and Anderson localization.  

PubMed

We demonstrate that a circular Bessel density function describes the electromagnetic field statistics in the Anderson localization regime using example numerical terahertz field data in strongly scattering media. This density function for localized fields provides a measure that allows identification and description in a manner akin to the Gaussian density function for weakly interacting scatterers, the mathematical framework to date for statistical optics. Our theory provides a framework for improved understanding of wave propagation in random media, random scattering media characterization, and imaging in and through randomly scattering media. PMID:25215701

Newman, Jason A; Chen, Yulu; Webb, Kevin J

2014-08-01

22

Three-dimensional Anderson localization in variable scale disorder.  

PubMed

We report on the impact of variable-scale disorder on 3D Anderson localization of a noninteracting ultracold atomic gas. A spin-polarized gas of fermionic atoms is localized by allowing it to expand in an optical speckle potential. Using a sudden quench of the localized density distribution, we verify that the density profile is representative of the underlying single-particle localized states. The geometric mean of the disordering potential correlation lengths is varied by a factor of 4 via adjusting the aperture of the speckle focusing lens. We observe that the root-mean-square size of the localized gas increases approximately linearly with the speckle correlation length, in qualitative agreement with the scaling predicted by weak scattering theory. PMID:24138250

McGehee, W R; Kondov, S S; Xu, W; Zirbel, J J; DeMarco, B

2013-10-01

23

Three-Dimensional Anderson Localization of Ultracold Fermionic Matter  

E-print Network

Anderson localization (AL) is an interference phenomenon in which waves fail to propagate in a disordered medium. We observe three-dimensional AL of non-interacting ultracold matter by allowing a spin-polarized atomic Fermi gas to expand into a disordered potential. Localization is characterized by the emergence of a two-component density distribution consisting of an expanding mobile component and a non-diffusing localized component. The behavior of the gas is qualitatively consistent with several features of 3D AL and is shown to be incompatible with simple trapping and classical diffusion. As predicted for 3D AL, we demonstrate that a mobility edge exists that increases with the disorder strength. Also, the thermally averaged localization length is shown to decrease with disorder strength and increase with particle energy.

Kondov, S S; Zirbel, J J; DeMarco, B

2011-01-01

24

Strong coupling to two-dimensional Anderson localized modes.  

PubMed

We use a scattering formalism to derive a condition of strong coupling between a resonant scatterer and an Anderson localized mode for electromagnetic waves in two dimensions. The strong coupling regime is demonstrated based on exact numerical simulations, in perfect agreement with theory. The strong coupling threshold can be expressed in terms of the Thouless conductance and the Purcell factor. This connects key concepts in transport theory and cavity quantum electrodynamics, and provides a practical tool for the design or analysis of experiments. PMID:23952400

Cazé, A; Pierrat, R; Carminati, R

2013-08-01

25

Anderson Localization for the Almost Mathieu Equation, III. SemiUniform Localization, Continuity of  

E-print Network

Anderson Localization for the Almost Mathieu Equation, III. Semi­Uniform Localization, Continuity Mathieu operator, (H !;â??;` \\Psi)(n) = \\Psi(n + 1) + \\Psi(n \\Gamma 1) +â?? cos(Ã?!n + `)\\Psi(n), has semi Introduction In this paper we study localization for the almost Mathieu operator H !;â??;` acting on ` 2 (Z): (H

26

Electron localization in liquid hydrocarbons: The Anderson model  

NASA Astrophysics Data System (ADS)

Anderson's model is applied for initial localization in liquid hydrocarbons (particularly n-alkanes) in conjunction with certain results of scaling theory. Medium connectivity is calculated using experimental X-ray data on liquid structure, from which critical disorder ( W/ V) c is computed, where W is diagonal disorder and V is the transfer energy. Actual W prevailing in the liquid is computed from anisotropic molecular polarizability. V is estimated by a heuristic procedure originating in scaling theory. These values are used to compute the percentage of initially delocalized states available for low-energy electrons in alkane liquids. This percentage decreases monotonically from methane (100%) to n-pentane and beyond (0%). In ethane and propane, the initial states are highly delocalized (97.6% and 83.9%, respectively). Subsequent trapping changes the situation as evidenced in mobility studies. Butane presents a partially, intermediate delocalized case (53.2%).

Hug, Gordon L.; Mozumder, A.

2008-10-01

27

Image transport using Anderson localized modes in disordered optical fibers  

NASA Astrophysics Data System (ADS)

An optical fiber with a transversely disordered yet longitudinally invariant refractive index profile can propagate a beam of light using transverse Anderson localization. A launched beam of light into the disordered optical fiber expands till it reaches its localization radius beyond which it propagates without further expansion. In contrast to a conventional single-core optical fiber in which a propagating beam of light can only couple to and propagate in the core, the beam of light can be coupled to any point at the tip of the disordered fiber. This property originated from the localized highly multimodal property of disordered optical fibers that can be used for high quality optical image transport. We experimentally compare the quality of the transported images in the disordered polymer optical fibers with those transported through the multicore imaging fibers, as well as conventional single core fibers. The impacts of source wavelength and refractive index difference between the disordered sites on the quality of the transported images in the disordered optical fibers is studied numerically. The role of randomness in improving the quality of transported images is investigated by comparing the full vectorial modes of a disordered fiber with those in a periodic multicore fiber.

Karbasi, Salman; Frazier, Ryan J.; Koch, Karl W.; Hawkins, Thomas; Ballato, John; Mafi, Arash

2014-03-01

28

Typical medium dynamical cluster approximation for the study of Anderson localization in three dimensions  

NASA Astrophysics Data System (ADS)

We develop a systematic typical medium dynamical cluster approximation that provides a proper description of the Anderson localization transition in three dimensions (3D). Our method successfully captures the localization phenomenon both in the low and large disorder regimes, and allows us to study the localization in different momenta cells, which renders the discovery that the Anderson localization transition occurs in a cell-selective fashion. As a function of cluster size, our method systematically recovers the reentrance behavior of the mobility edge and obtains the correct critical disorder strength for Anderson localization in 3D.

Ekuma, C. E.; Terletska, H.; Tam, K.-M.; Meng, Z.-Y.; Moreno, J.; Jarrell, M.

2014-02-01

29

Comprehensive proofs of localization in Anderson models with interaction. I. Two-particle localization estimates  

E-print Network

We discuss the techniques and results of the multi-particle Anderson localization theory for disordered quantum systems with nontrivial interaction. After a detailed presentation of the approach developed earlier by Aizenman and Warzel, we extend their results to the models with exponentially decaying, infinite-range interaction.

Victor Chulaevsky

2014-10-04

30

Localization and universality of Poisson statistics for the multidimensional Anderson model at weak disorder  

Microsoft Academic Search

.   We prove Anderson localization with the mean-field Lyapunov exponent and Poisson statistics for eigenvalue spacing for the\\u000a multi-dimensional Anderson model at weak disorder. These results are obtained by developing the supersymmetric formalism initiated\\u000a in [W1] (see also [SjW]).\\u000a rid

Wei-Min Wang

2001-01-01

31

Anderson Localization at the Subwavelength Scale and Loss Compensation for Surface-Plasmon Polaritons in Disordered Arrays of Metallic Nanowires  

E-print Network

Using a random array of coupled metallic nanowires as a generic example of disordered plasmonic systems, we demonstrate that the structural disorder induces localization of light in these nanostructures at a deep-subwavelength scale. The ab initio analysis is based on solving the complete set of 3D Maxwell equations. We find that random variations of the radius of coupled plasmonic nanowires are sufficient to induce the Anderson localization (AL) of surface-plasmon polaritons (SPPs), the size of these trapped modes being significantly smaller than the wavelength. Remarkably, the optical-gain coefficient, needed to compensate losses in the plasmonic components of the system, is much smaller than the loss coefficient of the metal, which is obviously beneficial for the realization of the AL in plasmonic nanostructures. The dynamics of excitation and propagation of the Anderson-localized SPPs are addressed too.

Shi, Xianling; Malomed, Boris A; Panoiu, Nicolae C; Ye, Fangwei

2014-01-01

32

Beyond Anderson Localization in 1D: Anomalous Localization of Microwaves in Random Waveguides  

E-print Network

Experimental evidence demonstrating that anomalous localization of waves can be induced in a controllable manner is reported. A microwave waveguide with dielectric slabs randomly placed is used to confirm the presence of anomalous localization. If the random spacing between slabs follows a distribution with a power-law tail (L\\'evy-type distribution), unconventional properties in the microwave-transmission fluctuations take place revealing the presence of anomalous localization. We study both theoretically and experimentally the complete distribution of the transmission through random waveguides characterized by $\\alpha=1/2$ ("L\\'evy waveguides") and $\\alpha=3/4$, $\\alpha$ being the exponent of the power-law tail of the L\\'evy-type distribution. As we show, the transmission distributions are determined by only two parameters, both of them experimentally accessible. Effects of anomalous localization on the transmission are compared with those from the standard Anderson localization.

Fernández-Marín, A A; Carbonell, J; Cervera, F; Sánchez-Dehesa, J; Gopar, V A

2014-01-01

33

Image transport through a disordered optical fibre mediated by transverse Anderson localization  

NASA Astrophysics Data System (ADS)

Transverse Anderson localization of light allows localized optical-beam-transport through a transversely disordered and longitudinally invariant medium. Its successful implementation in disordered optical fibres recently resulted in the propagation of localized beams of radii comparable to that of conventional optical fibres. Here we demonstrate optical image transport using transverse Anderson localization of light. The image transport quality obtained in the polymer disordered optical fibre is comparable to or better than some of the best commercially available multicore image fibres with less pixelation and higher contrast. It is argued that considerable improvement in image transport quality can be obtained in a disordered fibre made from a glass matrix with near wavelength-size randomly distributed air-holes with an air-hole fill-fraction of 50%. Our results open the way to device-level implementation of the transverse Anderson localization of light with potential applications in biological and medical imaging.

Karbasi, Salman; Frazier, Ryan J.; Koch, Karl W.; Hawkins, Thomas; Ballato, John; Mafi, Arash

2014-02-01

34

Non monotonic influence of Hubbard interaction on the Anderson localization of two-electron wavepackets  

NASA Astrophysics Data System (ADS)

We show that the Hubbard-like interaction between two electrons moving in a random one-dimensional potential landscape has a non monotonic influence on the Anderson localization phenomenon. Within a tight-binding approach, we follow the time-evolution of initially localized two-electron wavepackets and compute the participation number of all two-particle eigenstates. We evidence that the coupling between bounded and unbounded two-particle states leads to an overall weakening of Anderson localization of the predominant unbounded states. However, such coupling becomes ineffective in the regime of large interaction strengths on which the energy bands corresponding to these two classes of eigenstates become quite detached. We unveil that these two competing effects are at the origin of the non monotonic influence of the inter-particle interaction on Anderson localization.

Dias, W. S.; Lyra, M. L.

2014-10-01

35

Example of self-averaging in three dimensions: Anderson localization of electromagnetic waves in random distributions of pointlike scatterers  

E-print Network

Example of self-averaging in three dimensions: Anderson localization of electromagnetic waves is used to study Anderson localization of electromagnetic waves in three-dimensional disordered dielectric of localized electromagnetic waves, emerging in the limit of an infinite system, is numerically observed. S1063

Rusek, Marian

36

Observation of migrating transverse Anderson localizations of light in nonlocal media.  

PubMed

We report the experimental observation of the interaction and attraction of many localized modes in a two-dimensional system realized by a disordered optical fiber supporting transverse Anderson localization. We show that a nonlocal optically nonlinear response of thermal origin alters the localization length by an amount determined by the optical power and also induces an action at a distance between the localized modes and their spatial migration. Evidence of a collective and strongly interacting regime is given. PMID:24877941

Leonetti, Marco; Karbasi, Salman; Mafi, Arash; Conti, Claudio

2014-05-16

37

Direct observation of Anderson localization of matter waves in a controlled disorder.  

PubMed

In 1958, Anderson predicted the localization of electronic wavefunctions in disordered crystals and the resulting absence of diffusion. It is now recognized that Anderson localization is ubiquitous in wave physics because it originates from the interference between multiple scattering paths. Experimentally, localization has been reported for light waves, microwaves, sound waves and electron gases. However, there has been no direct observation of exponential spatial localization of matter waves of any type. Here we observe exponential localization of a Bose-Einstein condensate released into a one-dimensional waveguide in the presence of a controlled disorder created by laser speckle. We operate in a regime of pure Anderson localization, that is, with weak disorder-such that localization results from many quantum reflections of low amplitude-and an atomic density low enough to render interactions negligible. We directly image the atomic density profiles as a function of time, and find that weak disorder can stop the expansion and lead to the formation of a stationary, exponentially localized wavefunction-a direct signature of Anderson localization. We extract the localization length by fitting the exponential wings of the profiles, and compare it to theoretical calculations. The power spectrum of the one-dimensional speckle potentials has a high spatial frequency cutoff, causing exponential localization to occur only when the de Broglie wavelengths of the atoms in the expanding condensate are greater than an effective mobility edge corresponding to that cutoff. In the opposite case, we find that the density profiles decay algebraically, as predicted in ref. 13. The method presented here can be extended to localization of atomic quantum gases in higher dimensions, and with controlled interactions. PMID:18548065

Billy, Juliette; Josse, Vincent; Zuo, Zhanchun; Bernard, Alain; Hambrecht, Ben; Lugan, Pierre; Clément, David; Sanchez-Palencia, Laurent; Bouyer, Philippe; Aspect, Alain

2008-06-12

38

Anderson localization in a two-particle continuous model with an alloy-type external potential  

E-print Network

We establish exponential localization for a two-particle Anderson model in a Euclidean space ${\\mathbb R}^{d}$, $d\\ge 1$, in presence of a non-trivial short-range interaction and a random external potential of the alloy type. Specifically, we prove that all eigenfunctions with eigenvalues near the lower edge of the spectrum decay exponentially in $L^2$-norm.

A. Boutet de Monvel; V. Chulaevsky; P. Stollmann; Y. Suhov

2009-07-09

39

Anderson Localization for the Almost Mathieu II: Point Spectrum for ? 2  

E-print Network

Anderson Localization for the Almost Mathieu Equation, II: Point Spectrum for â?? ? 2 Svetlana Ya prove that for any â?? ? 2 and a.e. !; ` the point spectrum of the almost Mathieu operator (H(`)\\Psi) n attack on the almost­Mathieu operator on ` 2 (Z) : (H(`)\\Psi) n = \\Psi n\\Gamma1 + \\Psi n+1 + â?? cos(2Ã?

40

Steady-state and dynamical Anderson localization of counterpropagating beams in two-dimensional photonic lattices  

SciTech Connect

We demonstrate Anderson localization of mutually incoherent counterpropagating beams in an optically induced two-dimensional photonic lattice. The effect is displayed in a system of two broad probe beams propagating head-on through a fixed disordered photonic lattice recorded in a photorefractive crystal. In addition to the steady-state localization, we also observe the dynamical localization; that is, the localization of time-changing beams. As compared to the localization of single beams, in which there exist no dynamical effects, the localization of counterpropagating beams is more pronounced and prone to instabilities.

Jovic, Dragana M. [Institute of Physics, P. O. Box 57, 11001 Belgrade (Serbia); Texas A and M University at Qatar, P. O. Box 23874, Doha (Qatar); Belic, Milivoj R. [Texas A and M University at Qatar, P. O. Box 23874, Doha (Qatar)

2010-02-15

41

Anderson Localization for a Multi-Particle Quantum Graph  

NASA Astrophysics Data System (ADS)

We study a multi-particle quantum graph with random potential. Taking the approach of multiscale analysis, we prove exponential and strong dynamical localization of any order in the Hilbert-Schmidt norm near the spectral edge. Apart from the results on multi-particle systems, we also prove Lifshitz-type asymptotics for single-particle systems. This shows in particular that localization for single-particle quantum graphs holds under a weaker assumption on the random potential than previously known.

Sabri, Mostafa

2014-11-01

42

Efficient Anderson localization bounds for large multi-particle systems  

E-print Network

We study multi-particle interactive quantum disordered systems on a polynomially-growing countable connected graph (Z,E). The novelty is to give localization bounds uniform in finite or infinite volumes (subgraphs) in Z^N as well as for the whole of Z^N. Such bounds are proved here by means of a comprehensive fixed-energy multi-particle multi-scale analysis. Another feature of the paper is that we consider -- for the first time in the literature -- an infinite-range (although fast-decaying) interaction between particles. For the models under consideration we establish (1) exponential spectral localization, and (2) strong dynamical localization with sub-exponential rate of decay of the eigenfunction correlators.

Victor Chulaevsky; Yuri Suhov

2014-04-15

43

Statistical theory of a quantum emitter strongly coupled to Anderson-localized modes  

E-print Network

A statistical theory of the coupling between a quantum emitter and Anderson-localized cavity modes is presented based on a dyadic Green's function formalism. The probability of achieving the strong light-matter coupling regime is extracted for an experimentally realistic system composed of InAs quantum dots embedded in a disordered photonic crystal waveguide. We demonstrate that by engineering the relevant parameters that define the quality of light confinement, i.e. the light localization length and the loss length, strong coupling between a single quantum dot and an Anderson-localized cavity is within experimental reach. As a consequence of disorder-induced light confinement provides a novel platform for quantum electrodynamics experiments.

Henri Thyrrestrup; Stephan Smolka; Luca Sapienza; Peter Lodahl

2011-12-23

44

Statistical theory of a quantum emitter strongly coupled to Anderson-localized modes  

E-print Network

A statistical theory of the coupling between a quantum emitter and Anderson-localized cavity modes is presented based on a dyadic Green's function formalism. The probability of achieving the strong light-matter coupling regime is extracted for an experimentally realistic system composed of InAs quantum dots embedded in a disordered photonic crystal waveguide. We demonstrate that by engineering the relevant parameters that define the quality of light confinement, i.e. the light localization length and the loss length, strong coupling between a single quantum dot and an Anderson-localized cavity is within experimental reach. As a consequence of disorder-induced light confinement provides a novel platform for quantum electrodynamics experiments.

Thyrrestrup, Henri; Sapienza, Luca; Lodahl, Peter

2011-01-01

45

Statistical theory of a quantum emitter strongly coupled to Anderson-localized modes.  

PubMed

A statistical theory of the coupling between a quantum emitter and Anderson-localized cavity modes is presented based on a dyadic Green's function formalism. The probability of achieving the strong light-matter coupling regime is extracted for an experimentally realistic system composed of InAs quantum dots embedded in a disordered photonic crystal waveguide. We demonstrate that by engineering the relevant parameters that define the quality of light confinement, i.e., the light localization length and the loss length, strong coupling between a single quantum dot and an Anderson-localized cavity is within experimental reach. As a consequence, confining light by disorder provides a novel platform for quantum electrodynamics experiments. PMID:22540472

Thyrrestrup, Henri; Smolka, Stephan; Sapienza, Luca; Lodahl, Peter

2012-03-16

46

Light focusing in the Anderson regime.  

PubMed

Anderson localization is a regime in which diffusion is inhibited and waves (also electromagnetic waves) get localized. Here we exploit adaptive optics to achieve focusing in disordered optical fibres in the Anderson regime. By wavefront shaping and optimization, we observe the generation of a propagation-invariant beam, where light is trapped transversally by disorder, and show that Anderson localizations can be also excited by extended speckled beams. We demonstrate that disordered fibres allow a more efficient focusing action with respect to standard fibres in a way independent of their length, because of the propagation-invariant features and cooperative action of transverse localizations. PMID:25072204

Leonetti, Marco; Karbasi, Salman; Mafi, Arash; Conti, Claudio

2014-01-01

47

Anderson localization and Brewster anomalies in photonic disordered quasiperiodic lattices.  

PubMed

A comprehensive study of the properties of light propagation through one-dimensional photonic disordered quasiperiodic superlattices, composed of alternating layers with random thicknesses of air and a dispersive metamaterial, is theoretically performed. The superlattices consist of the successive stacking of N quasiperiodic Fibonacci or Thue-Morse heterostructures. The width of the slabs in the photonic superlattice may randomly fluctuate around its mean value, which introduces a structural disorder into the system. It is assumed that the left-handed layers have a Drude-type dispersive response for both the dielectric permittivity and magnetic permeability, and Maxwell's equations are solved for oblique incidence by using the transfer-matrix formalism. The influence of both quasiperiodicity and structural disorder on the localization length and Brewster anomalies are thoroughly discussed. PMID:22060519

Reyes-Gómez, E; Bruno-Alfonso, A; Cavalcanti, S B; Oliveira, L E

2011-09-01

48

Anderson localization and Brewster anomalies in photonic disordered quasiperiodic lattices  

SciTech Connect

A comprehensive study of the properties of light propagation through one-dimensional photonic disordered quasiperiodic superlattices, composed of alternating layers with random thicknesses of air and a dispersive metamaterial, is theoretically performed. The superlattices consist of the successive stacking of N quasiperiodic Fibonacci or Thue-Morse heterostructures. The width of the slabs in the photonic superlattice may randomly fluctuate around its mean value, which introduces a structural disorder into the system. It is assumed that the left-handed layers have a Drude-type dispersive response for both the dielectric permittivity and magnetic permeability, and Maxwell's equations are solved for oblique incidence by using the transfer-matrix formalism. The influence of both quasiperiodicity and structural disorder on the localization length and Brewster anomalies are thoroughly discussed.

Reyes-Gomez, E. [Instituto de Fisica, Universidad de Antioquia, AA 1226, Medellin (Colombia); Bruno-Alfonso, A. [Faculdade de Ciencias, UNESP-Universidade Estadual Paulista, 17033-360 Bauru-SP (Brazil); Cavalcanti, S. B. [Instituto de Fisica, Universidade Federal de Alagoas, 57072-970 Maceio-AL (Brazil); Oliveira, L. E. [Instituto de Fisica, Universidade Estadual de Campinas-UNICAMP, 13083-859 Campinas-SP (Brazil)

2011-09-15

49

Multi-particle dynamical localization in a continuous Anderson model with an alloy-type potential  

E-print Network

This paper is a complement to our earlier work \\cite{BCSS10b}. With the help of the multi-scale analysis, we derive, from estimates obtained in \\cite{BCSS10b}, dynamical localization for a multi-particle Anderson model in a Euclidean space $\\D{R}^{d}$, $d\\geq 1$, with a short-range interaction, subject to a random alloy-type potential.

Victor Chulaevsky; Anne Boutet de Monvel; Yuri Suhov

2010-07-22

50

Efficient localization bounds in a continuous multi-particle Anderson model with long-range interaction  

E-print Network

We establish strong dynamical localization for a class of multi-particle Anderson models in a Euclidean space with an alloy-type random potential and a sub-exponentially decaying interaction of infinite range. For the first time in the mathematical literature, the uniform decay bounds on the eigenfunction correlators at low energies are proved, in the multi-particle continuous configuration space, in the norm-distance and not in the Hausdorff pseudo-metric.

Victor Chulaevsky

2014-07-17

51

Uniform N-particle Anderson localization and unimodal eigenstates in deterministic disordered media without induction on the number of particles  

E-print Network

We present the first rigorous result on Anderson localization for interacting systems of quantum particles subject to a deterministic (e.g., almost periodic) disordered external potential. For a particular class of deterministic, fermionic, Anderson-type Hamiltonians on the lattice of an arbitrary dimension, and for a large class of underlying dynamical systems generating the external potential, we prove that the spectrum is pure point, all eigenstates are unimodal and feature a uniform exponential decay. In contrast to all prior mathematical works on multi-particle Anderson localization, we do not use the induction on the number of particles.

Victor Chulaevsky

2014-02-27

52

Coalescence of Anderson-localized modes at an exceptional point in 2D random media  

E-print Network

In non-hermitian systems, the particular position at which two eigenstates coalesce under a variation of a parameter in the complex plane is called an exceptional point. A non-perturbative theory is proposed which describes the evolution of modes in 2D open dielectric systems when permittivity distribution is modified. We successfully test this theory in a 2D disordered system to predict the position in the parameter space of the exceptional point between two Anderson-localized states. We observe that the accuracy of the prediction depends on the number of localized states accounted for. Such an exceptional point is experimentally accessible in practically relevant disordered photonic systems

Bachelard, Nicolas; Arlandis, Julien; Touzani, Rachid; Sebbah, Patrick

2014-01-01

53

Anderson Localization of Expanding Bose-Einstein Condensates in Random Potentials  

SciTech Connect

We show that the expansion of an initially confined interacting 1D Bose-Einstein condensate can exhibit Anderson localization in a weak random potential with correlation length {sigma}{sub R}. For speckle potentials the Fourier transform of the correlation function vanishes for momenta k>2/{sigma}{sub R} so that the Lyapunov exponent vanishes in the Born approximation for k>1/{sigma}{sub R}. Then, for the initial healing length of the condensate {xi}{sub in}>{sigma}{sub R} the localization is exponential, and for {xi}{sub in}<{sigma}{sub R} it changes to algebraic.

Sanchez-Palencia, L.; Clement, D.; Lugan, P.; Bouyer, P.; Aspect, A. [Laboratoire Charles Fabry de l'Institut d'Optique, CNRS and Univ. Paris-Sud, Campus Polytechnique, RD 128, F-91127 Palaiseau cedex (France); Shlyapnikov, G. V. [Laboratoire de Physique Theorique et Modeles Statistiques, Univ. Paris-Sud, F-91405 Orsay cedex (France); Van der Waals-Zeeman Institute, Univ. Amsterdam, Valckenierstraat 65/67, 1018 XE Amsterdam (Netherlands)

2007-05-25

54

Numerical study of Anderson localization of terahertz waves in disordered waveguides  

E-print Network

We present a numerical study of electromagnetic wave transport in disordered quasi-one-dimensional waveguides at terahertz frequencies. Finite element method calculations of terahertz wave propagation within LiNbO$_{3}$ waveguides with randomly arranged air-filled circular scatterers exhibit an onset of Anderson localization at experimentally accessible length scales. Results for the average transmission as a function of waveguide length and scatterer density demonstrate a clear crossover from diffusive to localized transport regime. In addition, we find that transmission fluctuations grow dramatically when crossing into the localized regime. Our numerical results are in good quantitative agreement with theory over a wide range of experimentally accessible parameters both in the diffusive and localized regime opening the path towards experimental observation of terahertz wave localization.

Lapointe, C P; Enderli, F; Feurer, T; Skipetrov, S E; Scheffold, F

2014-01-01

55

Self-Consistent Theory of Anderson Localization in Two Dimensions in View of Exact Transport Equation  

NASA Astrophysics Data System (ADS)

Self-consistent theory of Anderson localization of two-dimensional non-interacting electrons is formulated in the context of the exact transport equation and conductivity expression derived by the present authors (YI). The irreducible scattering vertex by Vollhardt and Wölfle (VW) is used in this equation, determining the diffusion coefficient in the scattering vertex self-consistently, through Einstein relation. It predicts a similar localization length to that obtained by VW, but shows that the conductivity evaluated by the Kubo formula decays exponentially, as the system size approaches the localization length. The result is opposed to the prediction by VW, who showed different behaviour of the diffusion coefficient that is equivalent to our conductivity. Our calculation also implies that the localization may be described along with the Landau-Silin theory of Fermi liquid.

Yamane, Y.; Itoh, M.

2012-10-01

56

Measurement-based tailoring of Anderson localization of partially coherent light  

E-print Network

We put forward an experimental configuration to observe transverse Anderson localization of partially coherent light beams with a tunable degree of first-order coherence. The scheme makes use of entangled photons propagating in disordered waveguide arrays, and is based on the unique relationship between the degree of entanglement of a pair of photons and the coherence properties of the individual photons constituting the pair. The scheme can be readily implemented with current waveguide-on-a-chip technology, and surprisingly, the tunability of the coherence properties of the individual photons is done at the measurement stage, without resorting changes of the light source itself.

Ji?í Svozilík; Jan Pe?ina Jr.; Juan P. Torres

2014-03-12

57

Singular behavior of Anderson-localized wave functions for a two-site model  

NASA Astrophysics Data System (ADS)

We show analytically that the apparent nonanalyticity discovered recently in the inverse participation ratio (IPR) of the eigenstates in Anderson's model of localization is also present in a simple two-site model, along with a concurrent nonanalyticity in the density of states (DOS) at the same energy. We demonstrate its evolution from two sites to the thermodynamic limit by numerical methods. For the two-site model, nonanalyticity in higher derivatives of the DOS and IPR is also proven to exist for all bounded distributions of disorder.

Johri, Sonika; Bhatt, R. N.

2012-09-01

58

Measurement-based tailoring of Anderson localization of partially coherent light  

NASA Astrophysics Data System (ADS)

We put forward an experimental configuration to observe transverse Anderson localization of partially coherent light beams with a tunable degree of first-order coherence. The scheme makes use of entangled photons propagating in disordered waveguide arrays and is based on the unique relationship between the degree of entanglement of a pair of photons and the coherence properties of the individual photons constituting the pair. The scheme can be readily implemented with current waveguide-on-a-chip technology, and surprisingly the tunability of the coherence properties of the individual photons is done at the measurement stage, without resorting to changes of the light source itself.

Svozilík, Ji?í; Pe?ina, Jan; Torres, Juan P.

2014-05-01

59

Large-disorder renormalization group study of the Anderson model of localization  

NASA Astrophysics Data System (ADS)

We describe a large-disorder renormalization group (LDRG) method for the Anderson model of localization in one dimension which decimates eigenstates based on the size of their wave functions rather than their energy. We show that our LDRG scheme flows to infinite disorder, and thus becomes asymptotically exact. We use it to obtain the disorder-averaged inverse participation ratio (IPR) and density of states (DOS) for the entire spectrum. A modified scheme is formulated for higher dimensions, which is found to be less efficient, but capable of improvement.

Johri, Sonika; Bhatt, R. N.

2014-08-01

60

Fabrication and characterization of disordered polymer optical fibers for transverse Anderson localization of light.  

PubMed

We develop and characterize a disordered polymer optical fiber that uses transverse Anderson localization as a novel waveguiding mechanism. The developed polymer optical fiber is composed of 80,000 strands of poly (methyl methacrylate) (PMMA) and polystyrene (PS) that are randomly mixed and drawn into a square cross section optical fiber with a side width of 250 ?m. Initially, each strand is 200 ?m in diameter and 8-inches long. During the mixing process of the original fiber strands, the fibers cross over each other; however, a large draw ratio guarantees that the refractive index profile is invariant along the length of the fiber for several tens of centimeters. The large refractive index difference of 0.1 between the disordered sites results in a small localized beam radius that is comparable to the beam radius of conventional optical fibers. The input light is launched from a standard single mode optical fiber using the butt-coupling method and the near-field output beam from the disordered fiber is imaged using a 40X objective and a CCD camera. The output beam diameter agrees well with the expected results from the numerical simulations. The disordered optical fiber presented in this work is the first device-level implementation of 2D Anderson localization, and can potentially be used for image transport and short-haul optical communication systems. PMID:23929276

Karbasi, Salman; Frazier, Ryan J; Mirr, Craig R; Koch, Karl W; Mafi, Arash

2013-01-01

61

Probing Anderson localization of light by weak non-linear effects  

NASA Astrophysics Data System (ADS)

Breakdown of wave transport due to strong disorder is a universal phenomenon known as Anderson localization (AL). It occurs because of the macroscopic population of reciprocal multiple scattering paths, which in three dimensional systems happens at a critical scattering strength. Intensities on these random loops should thus be highly increased relative to those of a diffusive sample. In order to highlight localized modes of light, we exploit the optical nonlinearities of TiO2. Power dependent and spectrally resolved time of flight distribution measurements in transmission through slabs of TiO2 powders at various turbidities reveal that mostly long loops are affected by nonlinearities and that the deviations from diffusive transport observed at long times are due to these localized modes. Our data are a first step in the experimental investigation of the interplay between nonlinear effects and AL in 3D.

Sperling, T.; Bührer, W.; Ackermann, M.; Aegerter, C. M.; Maret, G.

2014-11-01

62

Drift-induced excitable localized states.  

PubMed

Excitable localized states, spatial structures which possess both the features of temporal excitable pulses and of transverse cavity solitons, have been theoretically predicted in model systems as single pulses of light localized in space with a finite and deterministic duration. We study experimentally the nucleation of laser localized structures on a device defect and its motion along a spatial gradient. We demonstrate that in the reference frame of the drifting localized structure, the resulting dynamics presents the typical features of excitable systems. In particular, for specific parameter values, we observe that the nucleation of laser localized structures is triggered by noise, while the drift of the localized structure up to a spatial region where it vanishes provides the deterministic orbit which brings the system back to its initial rest state. The control of such structures may open the way to novel applications of localized structures beyond that of simple stationary bits. PMID:24476270

Turconi, M; Giudici, M; Barland, S

2013-12-01

63

Random walk approach to the analytic solution of random systems with multiplicative noise—The Anderson localization problem  

Microsoft Academic Search

We discuss here in detail a new analytical random walk approach to calculating the phase diagram for spatially extended systems with multiplicative noise. We use the Anderson localization problem as an example. The transition from delocalized to localized states is treated as a generalized diffusion with a noise-induced first-order phase transition. The generalized diffusion manifests itself in the divergence of

V. N. Kuzovkov; W. von Niessen

2006-01-01

64

One-dimensional Anderson Localization: distribution of wavefunction amplitude and phase at the band center  

SciTech Connect

The statistics of normalized wavefunctions in the one-dimensional (1d) Anderson model of localization is considered. It is shown that at any energy that corresponds to a rational filling factor f = (p/q) there is a statistical anomaly which is seen in expansion of the generating function (GF) to the order q-2 in the disorder parameter. We study in detail the principle anomaly at f = (1/2) that appears in the leading order. The transfer-matrix equation of the Fokker-Planck type with a two-dimensional internal space is derived for GF. It is shown that the zero-mode variant of this equation is integrable and a solution for the generating function is found in the thermodynamic limit.

Kravtsov, V. E. [Abdus Salam International Centre for Theoretical Physics, P.O.B. 586, 34100 Trieste (Italy); Yudson, V. I. [Landau Institute for Theoretical Physics, 2 Kosygina St., 117940 Moscow (Russian Federation)

2009-05-14

65

Statistics of the two-point transmission at Anderson localization transitions  

NASA Astrophysics Data System (ADS)

At Anderson critical points, the statistics of the two-point transmission TL for disordered samples of linear size L is expected to be multifractal with the following properties [Janssen , Phys. Rev. B 59, 15836 (1999)]: (i) the probability to have TL˜1/L? behaves as L?(?) , where the multifractal spectrum ?(?) terminates at ?=0 as a consequence of the physical bound TL?1 ; (ii) the exponents X(q) that govern the moments TLq¯˜1/LX(q) become frozen above some threshold: X(q?qsat)=-?(?=0) , i.e., all moments of order q?qsat are governed by the measure of the rare samples having a finite transmission (?=0) . In the present paper, we test numerically these predictions for the ensemble of L×L power-law random-banded matrices, where the random hopping Hi,j decays as a power law (b/|i-j|)a . This model is known to present an Anderson transition at a=1 between localized (a>1) and extended (a<1) states with critical properties that depend continuously on the parameter b . Our numerical results for the multifractal spectra ?b(?) for various b are in agreement with the relation ?(??0)=2[f(?=d+(?)/(2))-d] in terms of the singularity spectrum f(?) of individual critical eigenfunctions, in particular the typical exponents are related via the relation ?typ(b)=2[?typ(b)-d] . We also discuss the statistics of the two-point transmission in the delocalized phase and in the localized phase.

Monthus, Cécile; Garel, Thomas

2009-05-01

66

PHYSICAL REVIEW B 87, 045116 (2013) Anderson localization versus charge-density-wave formation in disordered electron systems  

E-print Network

localized for arbitrary energies and arbitrarily weak disorder. This holds for Anderson's noninteracting An understanding of how disorder and interaction act together is of vital importance not only to discuss the metal disorder and bosonic degrees of freedom are of importance. Regarding interacting bosons, ultracold atoms

Fehske, Holger

67

Electronic excitation spectra of the five-orbital Anderson impurity model: From the atomic limit to itinerant atomic magnetism  

NASA Astrophysics Data System (ADS)

We study the competition of Coulomb interaction and hybridization effects in the five-orbital Anderson impurity model by means of continuous time quantum Monte Carlo, exact diagonalization, and Hartree-Fock calculations. The dependence of the electronic excitation spectra and thermodynamic ground-state properties on the hybridization strength and the form of the Coulomb interaction is systematically investigated for impurity occupation number N ?6. With increasing hybridization strength, a Kondo resonance emerges, broadens and merges with some of the upper and lower Hubbard peaks. Concomitantly, there is an increase of charge fluctuations at the impurity site. In contrast to the single-orbital model, some atomic multiplet peaks and exchange split satellites persist despite strong charge fluctuations. We find that Hund's coupling leads to a state that may be characterized as an itinerant single atom magnet. As the filling is increased, the magnetic moment decreases, but the spin freezing phenomenon persists up to N ?8. When the hybridization is weak, the positions of atomic ionization peaks are rather sensitive to shifts of the impurity on-site energies. This allows to distinguish atomic ionization peaks from quasiparticle peaks or satellites in the electronic excitation spectra. On the methodological side we show that a comparison between the spectra obtained from Monte Carlo and exact diagonalization calculations is possible if the charge fluctuations are properly matched.

Huang, Li; Wehling, Tim O.; Werner, Philipp

2014-06-01

68

Anderson localization for discretely disordered metamaterials: polarization and off-axis incidence effects  

NASA Astrophysics Data System (ADS)

We consider polarization and off-axis incidence effects for one-dimensional random stacks consisting of alternating and non-alternating layers of positive and negative index materials, with index of refraction and thickness discretely disordered. Such long randomly disordered systems exhibit Anderson localization, whose effects can be studied via the Lyapunov exponent of the product of independent identically distributed random transfer matrices modeling the stack. We use Furstenberg's integral formula to calculate Lyapunov exponents for s and p polarizations, and for a range of angles of incidence for these random matrix models. Furstenberg's integral formula requires integration with respect to the probability distribution of the randomized layer parameters, and integration with respect to the so-called invariant probability measure of the direction of the vector propagated by the long chain of random matrices. This invariant measure can rarely be calculated analytically, so some numerical technique must be used to produce the invariant measure for a given random matrix product model. Here we use the algorithm of Froyland-Aihara, especially suited for discretely disordered parameters, to calculate the invariant measure. This algorithm produces the invariant measure from the left eigenvector of a certain sparse row-stochastic matrix. This sparse matrix represents the probabilities that a vector in one of a number of discrete directions will be transferred to another discrete direction via the random transfer matrix. The Froyland-Aihara algorithm thus provides a non-Monte Carlo method to calculate localization effects, with potential reduction in computation time compared to traditional layer or vector iteration methods.

Kissel, Glen J.

2014-09-01

69

Localized excitations in UPdSn  

SciTech Connect

The authors have measured the inelastic neutron-scattering response of UPdSn at various temperatures using the HET and PHAROS spectrometers at the ISIS and MLNSC facilities, respectively. UPdSn shows some quasielastic scattering, which may be attributed to the hybridization of the 5f electrons with the conduction electrons. Furthermore, they find a clear excitation around 40meV above 40K in addition to the phonon contribution. While this excitation may be indicative of crystal fields in UPdSn, its strong temperature dependence seems to contradict a simple crystal-field picture. Below T{sub N}, the unusual temperature dependence may be attributed to magnetically-driven distortions (and subsequent changes in the local surrounding of the U ions), but there is some evidence that other additional mechanism(s) may contribute above T{sub N}. Some possible mechanisms will be discussed.

Nakotte, H.; Robinson, R.A.; Swan, T.; Kelley, T. [Los Alamos National Lab., NM (United States). Manuel Lujan Jr. Neutron Scattering Center; Bull, M. [Univ. of London (United Kingdom); [Univ. of Amsterdam (Netherlands). Van der Waals-Zeeman Inst.; McEwen, K.A. [Univ. of London (United Kingdom); Ecclestone, R.A. [Rutherford Appleton Lab., Chilton (United Kingdom). ISIS Div.; Brueck, E. [Univ. of Amsterdam (Netherlands). Van der Waals-Zeeman Inst.

1997-11-01

70

Giant fluctuations of local magnetoresistance of organic spin valves and the non-Hermitian 1D Anderson model.  

PubMed

Motivated by recent experiments, where the tunnel magnetoresitance (TMR) of a spin valve was measured locally, we theoretically study the distribution of TMR along the surface of magnetized electrodes. We show that, even in the absence of interfacial effects (like hybridization due to donor and acceptor molecules), this distribution is very broad, and the portion of area with negative TMR is appreciable even if on average the TMR is positive. The origin of the local sign reversal is quantum interference of subsequent spin-rotation amplitudes in the course of incoherent transport of carriers between the source and the drain. We find the distribution of local TMR exactly by drawing upon formal similarity between evolution of spinors in time and of the reflection coefficient along a 1D chain in the Anderson model. The results obtained are confirmed by the numerical simulations. PMID:24949781

Roundy, R C; Nemirovsky, D; Kagalovsky, V; Raikh, M E

2014-06-01

71

Giant Fluctuations of Local Magnetoresistance of Organic Spin Valves and the Non-Hermitian 1D Anderson Model  

NASA Astrophysics Data System (ADS)

Motivated by recent experiments, where the tunnel magnetoresitance (TMR) of a spin valve was measured locally, we theoretically study the distribution of TMR along the surface of magnetized electrodes. We show that, even in the absence of interfacial effects (like hybridization due to donor and acceptor molecules), this distribution is very broad, and the portion of area with negative TMR is appreciable even if on average the TMR is positive. The origin of the local sign reversal is quantum interference of subsequent spin-rotation amplitudes in the course of incoherent transport of carriers between the source and the drain. We find the distribution of local TMR exactly by drawing upon formal similarity between evolution of spinors in time and of the reflection coefficient along a 1D chain in the Anderson model. The results obtained are confirmed by the numerical simulations.

Roundy, R. C.; Nemirovsky, D.; Kagalovsky, V.; Raikh, M. E.

2014-06-01

72

Statistics of renormalized on-site energies and renormalized hoppings for Anderson localization in two and three dimensions  

NASA Astrophysics Data System (ADS)

For Anderson localization models, there exists an exact real-space renormalization procedure at fixed energy which preserves the Green’s functions of the remaining sites [H. Aoki, J. Phys. C 13, 3369 (1980)]. Using this procedure for the Anderson tight-binding model in dimensions d=2,3 , we study numerically the statistical properties of the renormalized on-site energies ? and of the renormalized hoppings V as a function of the linear size L . We find that the renormalized on-site energies ? remain finite in the localized phase in d=2,3 and at criticality (d=3) , with a finite density at ?=0 and a power-law decay 1/?2 at large |?| . For the renormalized hoppings in the localized phase, we find: lnVL?-(L)/(?loc)+L?u , where ?loc is the localization length and u a random variable of order one. The exponent ? is the droplet exponent characterizing the strong disorder phase of the directed polymer in a random medium of dimension 1+(d-1) , with ?(d=2)=1/3 and ?(d=3)?0.24 . At criticality (d=3) , the statistics of renormalized hoppings V is multifractal, in direct correspondence with the multifractality of individual eigenstates and of two-point transmissions. In particular, we measure ?typ?1 for the exponent governing the typical decay lnVL¯?-?typlnL , in agreement with previous numerical measures of ?typ=d+?typ?4 for the singularity spectrum f(?) of individual eigenfunctions. We also present numerical results concerning critical surface properties.

Monthus, Cécile; Garel, Thomas

2009-07-01

73

Microwave conductance in random waveguides in the cross-over to Anderson localization and single-parameter scaling  

PubMed Central

The nature of transport of electrons and classical waves in disordered systems depends upon the proximity to the Anderson localization transition between freely diffusing and localized waves. The suppression of average transport and the enhancement of relative fluctuations in conductance in one-dimensional samples with lengths greatly exceeding the localization length, , are related in the single-parameter scaling (SPS) theory of localization. However, the difficulty of producing an ensemble of statistically equivalent samples in which the electron wave function is temporally coherent has so-far precluded the experimental demonstration of SPS. Here we demonstrate SPS in random multichannel systems for the transmittance T of microwave radiation, which is the analog of the dimensionless conductance. We show that for , a single eigenvalue of the transmission matrix (TM) dominates transmission, and the distribution of the is Gaussian with a variance equal to the average of , as conjectured by SPS. For samples in the cross-over to localization, , we find a one-sided distribution for . This anomalous distribution is explained in terms of a charge model for the eigenvalues of the TM ? in which the Coulomb interaction between charges mimics the repulsion between the eigenvalues of TM. We show in the localization limit that the joint distribution of T and the effective number of transmission eigenvalues determines the probability distributions of intensity and total transmission for a single-incident channel. PMID:24516156

Shi, Zhou; Wang, Jing; Genack, Azriel Z.

2014-01-01

74

Transport properties of Floquet topological superconductors at the transition from the topological phase to the Anderson localized phase  

NASA Astrophysics Data System (ADS)

The Floquet topological superconducting state is a nonequilibrium time-periodic state hosting Majorana fermions. We study its transport properties by using the Kitaev model with time-periodic incommensurate potentials, which experiences phase transition from the Floquet topological superconducting phase to the Anderson localized phase with increasing driving strength. We study both the real time dynamics of the current and the nonanalytic behavior of the tunneling conductance at the transition. Especially, we find that the tunneling conductance changes continuously at the transition, being a finite value in the presence of Floquet-Majorana fermions, but drops to zero as the Majorana fermions vanish. For a special choice of parameters, the Majorana fermions revive at a larger driving strength, accompanied by the revival of conductances.

Wang, Pei; Sun, Qing-feng; Xie, X. C.

2014-10-01

75

PHYSICAL REVIEW B 85, 014205 (2012) Nonreciprocal Anderson localization in magneto-optical random structures  

E-print Network

on the weak localization effect in three-dimensional random scattering media was examined previously,20 features in the averaged localization length and individual transmission resonances. We employ the short-wavelength approximation where the localization effects are strong and consider both the Faraday and Voigt magneto

76

Anderson Localization Triggered by Spin Disorder—With an Application to Eu x Ca1- x B6  

NASA Astrophysics Data System (ADS)

The phenomenon of Anderson localization is studied for a class of one-particle Schrödinger operators with random Zeeman interactions. These operators arise as follows: Static spins are placed randomly on the sites of a simple cubic lattice according to a site percolation process with density x and coupled to one another ferromagnetically. Scattering of an electron in a conduction band at these spins is described by a random Zeeman interaction term that originates from indirect exchange. It is shown rigorously that, for positive values of x below the percolation threshold, the spectrum of the one-electron Schrödinger operator near the band edges is dense pure-point, and the corresponding eigenfunctions are exponentially localized. Localization near the band edges persists in a weak external magnetic field, H, but disappears gradually, as H is increased. Our results lead us to predict the phenomenon of colossal (negative) magnetoresistance and the existence of a Mott transition, as H and/or x are increased. Our analysis is motivated directly by experimental results concerning the magnetic alloy Eu x Ca1- x B6.

Egli, Daniel; Fröhlich, Jürg; Ott, Hans-Rudolf

2011-06-01

77

Anderson wall and Bloch oscillations in molecular rotation  

E-print Network

We describe a universal behavior of linear molecules excited by a periodic train of short laser pulses under quantum resonance conditions. In a rigid rotor the resonance causes an unlimited ballistic growth of the angular momentum. We show that the centrifugal distortion of rotating molecules eventually halts the growth, by causing Anderson localization beyond a critical value of the angular momentum -- the Anderson wall. Its position solely depends on the molecular rotational constants and lies in the range of a few tens of hbar. Below the wall, rotational excitation oscillates with the number of pulses due to a mechanism similar to Bloch oscillations in crystalline solids. We suggest optical experiments capable of observing the rotational Anderson wall and Bloch oscillations at ambient conditions with the help of existing laser technology.

Floß, Johannes

2014-01-01

78

Anderson wall and Bloch oscillations in molecular rotation  

E-print Network

We describe a universal behavior of linear molecules excited by a periodic train of short laser pulses under quantum resonance conditions. In a rigid rotor the resonance causes an unlimited ballistic growth of the angular momentum. We show that the centrifugal distortion of rotating molecules eventually halts the growth, by causing Anderson localization beyond a critical value of the angular momentum -- the Anderson wall. Its position solely depends on the molecular rotational constants and lies in the range of a few tens of hbar. Below the wall, rotational excitation oscillates with the number of pulses due to a mechanism similar to Bloch oscillations in crystalline solids. We suggest optical experiments capable of observing the rotational Anderson wall and Bloch oscillations at near-ambient conditions with the help of existing laser technology.

Johannes Floß; Ilya Sh. Averbukh

2014-03-10

79

Anderson wall and BLOCH oscillations in molecular rotation.  

PubMed

We describe a universal behavior of linear molecules excited by a periodic train of short laser pulses under quantum resonance conditions. In a rigid rotor, the resonance causes an unlimited ballistic growth of the angular momentum. We show that the centrifugal distortion of rotating molecules eventually halts the growth, by causing Anderson localization beyond a critical value of the angular momentum--the Anderson wall. Its position solely depends on the molecular rotational constants and lies in the range of a few tens of ?. Below the wall, rotational excitation oscillates with the number of pulses due to a mechanism similar to Bloch oscillations in crystalline solids. We suggest optical experiments capable of observing the rotational Anderson wall and Bloch oscillations at near-ambient conditions with the help of existing laser technology. PMID:25105614

Floß, Johannes; Averbukh, Ilya Sh

2014-07-25

80

Anderson Wall and Bloch Oscillations in Molecular Rotation  

NASA Astrophysics Data System (ADS)

We describe a universal behavior of linear molecules excited by a periodic train of short laser pulses under quantum resonance conditions. In a rigid rotor, the resonance causes an unlimited ballistic growth of the angular momentum. We show that the centrifugal distortion of rotating molecules eventually halts the growth, by causing Anderson localization beyond a critical value of the angular momentum—the Anderson wall. Its position solely depends on the molecular rotational constants and lies in the range of a few tens of ?. Below the wall, rotational excitation oscillates with the number of pulses due to a mechanism similar to Bloch oscillations in crystalline solids. We suggest optical experiments capable of observing the rotational Anderson wall and Bloch oscillations at near-ambient conditions with the help of existing laser technology.

Floß, Johannes; Averbukh, Ilya Sh.

2014-07-01

81

Strong Coupling to Two-Dimensional Anderson Localized Modes A. Caze, R. Pierrat, and R. Carminati*  

E-print Network

and the Purcell factor. This connects key concepts in transport theory and cavity quantum electrodynamics localized systems. The results are in perfect agreement with a simple coupled- mode theory. Using concepts in transport theory and cavity QED. It also provides a simple rule for the design and

Paris 7 - Denis Diderot, Université

82

Anderson localization of ballooning modes, quantum chaos and the stability of compact quasiaxially symmetric stellarators  

Microsoft Academic Search

The radially local magnetohydrodynamic (MHD) ballooning stability of a compact, quasiaxially symmetric stellarator (QAS), is examined just above the ballooning beta limit with a method that can lead to estimates of global stability. Here MHD stability is analyzed through the calculation and examination of the ballooning mode eigenvalue isosurfaces in the 3-space (s,?,?k);s is the edge normalized toroidal flux, ?

M. H. Redi; J. L. Johnson; S. Klasky; J. Canik; R. L. Dewar; W. A. Cooper

2002-01-01

83

Anderson localization of ballooning modes, quantum chaos and the stability of compact quasiaxially symmetric stellarators  

Microsoft Academic Search

The radially local magnetohydrodynamic (MHD) ballooning stability of a compact, quasiaxially symmetric stellarator (QAS), is examined just above the ballooning beta limit with a method that can lead to estimates of global stability. Here MHD stability is analyzed through the calculation and examination of the ballooning mode eigenvalue isosurfaces in the 3-space (s,alpha,thetak) s is the edge normalized toroidal flux,

M. H. Redi; J. L. Johnson; S. Klasky; J. Canik; R. L. Dewar; W. A. Cooper

2002-01-01

84

PHYSICAL REVIEW B 85, 045122 (2012) Transmission and Anderson localization in dispersive metamaterials  

E-print Network

metamaterials Ara A. Asatryan,1 Lindsay C. Botten,1 Michael A. Byrne,1 Valentin D. Freilikher,2 Sergey A, one-dimensional stacks composed of dispersive metamaterials and normal materials are presented that the localization of waves in random stacks composed entirely of either metamaterial or normal dielectric layers

85

Anderson Localization of Ballooning Modes, Quantum Chaos and the Stability of Compact Quasiaxially Symmetric Stellarators  

SciTech Connect

The radially local magnetohydrodynamic (MHD) ballooning stability of a compact, quasiaxially symmetric stellarator (QAS), is examined just above the ballooning beta limit with a method that can lead to estimates of global stability. Here MHD stability is analyzed through the calculation and examination of the ballooning mode eigenvalue isosurfaces in the 3-space [s, alpha, theta(subscript ''k'')]; s is the edge normalized toroidal flux, alpha is the field line variable, and q(subscript ''k'') is the perpendicular wave vector or ballooning parameter. Broken symmetry, i.e., deviations from axisymmetry, in the stellarator magnetic field geometry causes localization of the ballooning mode eigenfunction, and gives rise to new types of nonsymmetric eigenvalue isosurfaces in both the stable and unstable spectrum. For eigenvalues far above the marginal point, isosurfaces are topologically spherical, indicative of strong ''quantum chaos.'' The complexity of QAS marginal isosurfaces suggests that finite Larmor radius stabilization estimates will be difficult and that fully three-dimensional, high-n MHD computations are required to predict the beta limit.

M.H. Redi; J.L. Johnson; S. Klasky; J. Canik; R.L. Dewar; W.A. Cooper

2001-10-31

86

Weak chaos in the disordered nonlinear Schroedinger chain: Destruction of Anderson localization by Arnold diffusion  

SciTech Connect

Research Highlights: > In a one-dimensional disordered chain of oscillators all normal modes are localized. > Nonlinearity leads to chaotic dynamics. > Chaos is concentrated on rare chaotic spots. > Chaotic spots drive energy exchange between oscillators. > Macroscopic transport coefficients are obtained. - Abstract: The subject of this study is the long-time equilibration dynamics of a strongly disordered one-dimensional chain of coupled weakly anharmonic classical oscillators. It is shown that chaos in this system has a very particular spatial structure: it can be viewed as a dilute gas of chaotic spots. Each chaotic spot corresponds to a stochastic pump which drives the Arnold diffusion of the oscillators surrounding it, thus leading to their relaxation and thermalization. The most important mechanism of equilibration at long distances is provided by random migration of the chaotic spots along the chain, which bears analogy with variable-range hopping of electrons in strongly disordered solids. The corresponding macroscopic transport equations are obtained.

Basko, D.M., E-mail: denis.basko@grenoble.cnrs.fr [Laboratoire de Physique et Modelisation des Milieux Condenses, Universite de Grenoble 1 and CNRS, BP166, 38042 Grenoble (France)

2011-07-15

87

Quantum Entanglement of Localized Excited States at Finite Temperature  

E-print Network

In this work we study the time evolutions of (Renyi) entanglement entropy of locally excited states in two dimensional conformal field theories (CFTs) at finite temperature. We consider excited states created by acting with local operators on thermal states and give both field theoretic and holographic calculations. In free field CFTs, we find that the growth of Renyi entanglement entropy at finite temperature is reduced compared to the zero temperature result by a small quantity proportional to the width of the localized excitations. On the other hand, in finite temperature CFTs with classical gravity duals, we find that the entanglement entropy approaches a characteristic value at late time. This behaviour does not occur at zero temperature. We also study the mutual information between the two CFTs in the thermofield double (TFD) formulation and give physical interpretations of our results.

Caputa, Pawel; Stikonas, Andrius; Takayanagi, Tadashi

2014-01-01

88

Anderson localization in two-dimensional graphene with short-range disorder: One-parameter scaling and finite-size effects  

NASA Astrophysics Data System (ADS)

We study Anderson localization in graphene with short-range disorder using the real-space Kubo-Greenwood method implemented on graphics processing units. Two models of short-range disorder, namely, the Anderson on-site disorder model and the vacancy defect model, are considered. For graphene with Anderson disorder, localization lengths of quasi-one-dimensional systems with various disorder strengths, edge symmetries, and boundary conditions are calculated using the real-space Kubo-Greenwood formalism, showing excellent agreement with independent transfer matrix calculations and superior computational efficiency. Using these data, we demonstrate the applicability of the one-parameter scaling theory of localization length and propose an analytical expression for the scaling function, which provides a reliable method of computing the two-dimensional localization length. This method is found to be consistent with another widely used method which relates the two-dimensional localization length to the elastic mean free path and the semiclassical conductivity. Abnormal behavior at the charge neutrality point is identified and interpreted to be caused by finite-size effects when the system width is comparable to or smaller than the elastic mean free path. We also demonstrate the finite-size effect when calculating the two-dimensional conductivity in the localized regime and show that a renormalization group ? function consistent with the one-parameter scaling theory can be extracted numerically. For graphene with vacancy disorder, we show that the proposed scaling function of localization length also applies. Last, we discuss some ambiguities in calculating the semiclassical conductivity around the charge neutrality point due to the presence of resonant states.

Fan, Zheyong; Uppstu, Andreas; Harju, Ari

2014-06-01

89

Anderson Localization for the Almost Mathieu Equation, III. SemiUniform Localization, Continuity of Gaps, and Measure of the Spectrum  

Microsoft Academic Search

We show that the almost Mathieu operator, $(H_{\\\\omega,\\\\lambda,\\\\theta}\\\\Psi)(n)=\\\\Psi(n+1) + \\\\Psi(n-1) + \\\\lambda\\\\cos(\\\\pi\\\\omega n +\\\\theta)\\\\Psi(n)$, has semi-uniform (and thus dynamical) localization for u > 15 and a.e. y,Š. We also obtain a new estimate on gap continuity (in y) for this operator with u > 29 (or u $|4-2|\\\\lambda||$ for u in this range and all irrational y's.

Svetlana Y. Jitomirskaya; Yoram Last

1998-01-01

90

Spin pumping by nonreciprocal spin waves under local excitation  

NASA Astrophysics Data System (ADS)

We measured spatial distribution of spin pumping by nonreciprocal magnetostatic surface waves (MSSWs) using inverse spin Hall effect (ISHE) in a YIG/Pt system under local excitation. The local intensity of spin pumping by MSSWs shows center displacement of ± 0.1 mm from the center of a waveguide according to the reversal of a bias field, which is due to the nonreciprocal propagation of MSSWs over a macroscopic distance. The combination of spin pumping and ISHE enables electrical investigation of local spin dynamics in a magnetic insulator.

Iguchi, R.; Ando, K.; Qiu, Z.; An, T.; Saitoh, E.; Sato, T.

2013-01-01

91

Local and Nonlocal Excitations in Cu 4p-1s Resonant X-Ray Emission Spectra of Nd 2CuO 4  

NASA Astrophysics Data System (ADS)

Theoretical study for Cu 4p-1s resonant X-ray emission spectroscopy (RXES) of Nd2CuO4 is given in the context of local and nonlocal natures of electronic excitations. Detailed analyses with an impurity Anderson model and multi-Cu models are presented, based on exact diagonalization technique. By investigating partial densities of states, basic characters of each excited state are clarified. It is demonstrated that a disagreement with experimental data is unavoidable with the impurity model. The key concept to solve the difficulty is Zhang-Rice singlet formation in the intermediate state of RXES. We find that it survives in the final state of RXES as the lowest charge-transfer excitation. The limitation of the impurity model and the essential role of nonlocal excitations in RXES are stressed.

Idé, Tsuyoshi; Kotani, Akio

1999-09-01

92

Excitation of local magnetic moments by tunneling electrons  

NASA Astrophysics Data System (ADS)

The advent of milli-kelvin scanning tunneling microscopes (STM) with inbuilt magnetic fields has opened access to the study of magnetic phenomena with atomic resolution at surfaces. In the case of single atoms adsorbed on a surface, the existence of different magnetic energy levels localized on the adsorbate is due to the breaking of the rotational invariance of the adsorbate spin by the interaction with its environment, leading to energy terms in the meV range. These structures were revealed by STM experiments in IBM Almaden in the early 2000s for atomic adsorbates on CuN surfaces. The experiments consisted in the study of the changes in conductance caused by inelastic tunneling of electrons (IETS, inelastic electron tunneling spectroscopy). Manganese and Iron adatoms were shown to have different magnetic anisotropies induced by the substrate. More experiments by other groups followed up, showing that magnetic excitations could be detected in a variety of systems: e.g. complex organic molecules showed that their magnetic anisotropy was dependent on the molecular environment, piles of magnetic molecules showed that they interact via intermolecular exchange interaction, spin waves were excited on ferromagnetic surfaces and in Mn chains, and magnetic impurities have been analyzed on semiconductors. These experiments brought up some intriguing questions: the efficiency of magnetic excitations was very high, the excitations could or could not involve spin flip of the exciting electron and singular-like behavior was sometimes found at the excitation thresholds. These facts called for extended theoretical analysis; perturbation theories, sudden-approximation approaches and a strong coupling scheme successfully explained most of the magnetic inelastic processes. In addition, many-body approaches were also used to decipher the interplay between inelastic processes and the Kondo effect. Spin torque transfer has been shown to be effective in changing spin orientations of an adsorbate in theoretical works, and soon after it was shown experimentally. More recently, the previously mentioned strong coupling approach was extended to treat the excitation of spin waves in atomic chains and the ubiquitous role of electron-hole pair creation in de-exciting spins on surfaces has been analyzed. This review article expounds these works, presenting the theoretical approach by the authors while trying to thoroughly review parallel theoretical and experimental works.

Gauyacq, Jean-Pierre; Lorente, Nicolás; Novaes, Frederico Dutilh

2012-05-01

93

Limits of localized heating by electromagnetically excited nanoparticles  

NASA Astrophysics Data System (ADS)

Based on an analysis of the diffusive heat flow equation, we determine limits on the localization of heating of soft materials and biological tissues by electromagnetically excited nanoparticles. For heating by rf magnetic fields or heating by typical continuous wave lasers, the local temperature rise adjacent to magnetic or metallic nanoparticles is negligible. However, heat dissipation for a large number of nanoparticles dispersed in a macroscopic region of a material or tissue produces a global temperature rise that is orders of magnitude larger than the temperature rise adjacent to a single nanoparticle. One approach for producing a significant local temperature rise on nanometer length scales is heating by high-power pulsed or modulated lasers with low duty cycle.

Keblinski, Pawel; Cahill, David G.; Bodapati, Arun; Sullivan, Charles R.; Taton, T. Andrew

2006-09-01

94

Relativistic Coulomb excitation within Time Dependent Superfluid Local Density Approximation  

E-print Network

Within the framework of the unrestricted time-dependent density functional theory, we present for the first time an analysis of the relativistic Coulomb excitation of the heavy deformed open shell nucleus $^{238}$U. The approach is based on Superfluid Local Density Approximation (SLDA) formulated on a spatial lattice that can take into account coupling to the continuum, enabling self-consistent studies of superfluid dynamics of any nuclear shape. We have computed the energy deposited in the target nucleus as a function of the impact parameter, finding it to be significantly larger than the estimate using the Goldhaber-Teller model. The isovector giant dipole resonance, the dipole pygmy resonance and giant quadrupole modes were excited during the process. The one body dissipation of collective dipole modes is shown to lead a damping width $\\Gamma_\\downarrow \\approx 0.4$ MeV and the number of pre-equilibrium neutrons emitted has been quantified.

I. Stetcu; C. Bertulani; A. Bulgac; P. Magierski; K. J. Roche

2014-03-11

95

Imaging Ultrafast Demagnetization Dynamics after a Spatially Localized Optical Excitation  

NASA Astrophysics Data System (ADS)

Ultrashort, coherent x-ray pulses of a free-electron laser are used to holographically image the magnetization dynamics within a magnetic domain pattern after creation of a localized excitation via an optical standing wave. We observe a spatially confined reduction of the magnetization within a couple of hundred femtoseconds followed by its slower recovery. Additionally, the experimental results show evidence of a spatial evolution of magnetization, which we attribute to ultrafast transport of nonequilibrium spin-polarized electrons for early times and to a fluence-dependent remagnetization rate for later times.

von Korff Schmising, C.; Pfau, B.; Schneider, M.; Günther, C. M.; Giovannella, M.; Perron, J.; Vodungbo, B.; Müller, L.; Capotondi, F.; Pedersoli, E.; Mahne, N.; Lüning, J.; Eisebitt, S.

2014-05-01

96

Unusual magneto-optical behavior induced by local dielectric variations under localized surface plasmon excitations.  

PubMed

We study the effect of global and local dielectric variations on the polarization conversion rps response of ordered nickel nanowires embedded in an alumina matrix. When considering local changes, we observe a non-monotonous behavior of the rps, its intensity unusually modified far beyond to what it is expected for a monotonous change of the whole refractive index of the embedding medium. This is related to the local redistribution of the electromagnetic field when a localized surface plasmon is excited. This finding may be employed to develop and improve new biosensing magnetoplasmonic devices. PMID:21711939

González-Díaz, Juan B; García-Martín, Antonio; Reig, Gaspar Armelles

2011-01-01

97

The Anderson Quin Cycle  

Microsoft Academic Search

The objective of this study was to make a more refined evaluation of the Anderson Quin Cycle based on most recent information on the performance of various elements that will be used in the Anderson Quin Cycle. My original estimate of the work plan for evaluating and optimizing the Anderson Quin Cycle called for 7000 man hours of work. Since

J. H. Anderson; W. M. Bilbow

1993-01-01

98

Local Control Models of Cardiac Excitation-Contraction Coupling  

PubMed Central

In cardiac muscle, release of activator calcium from the sarcoplasmic reticulum occurs by calcium- induced calcium release through ryanodine receptors (RyRs), which are clustered in a dense, regular, two-dimensional lattice array at the diad junction. We simulated numerically the stochastic dynamics of RyRs and L-type sarcolemmal calcium channels interacting via calcium nano-domains in the junctional cleft. Four putative RyR gating schemes based on single-channel measurements in lipid bilayers all failed to give stable excitation–contraction coupling, due either to insufficiently strong inactivation to terminate locally regenerative calcium-induced calcium release or insufficient cooperativity to discriminate against RyR activation by background calcium. If the ryanodine receptor was represented, instead, by a phenomenological four-state gating scheme, with channel opening resulting from simultaneous binding of two Ca2+ ions, and either calcium-dependent or activation-linked inactivation, the simulations gave a good semiquantitative accounting for the macroscopic features of excitation–contraction coupling. It was possible to restore stability to a model based on a bilayer-derived gating scheme, by introducing allosteric interactions between nearest-neighbor RyRs so as to stabilize the inactivated state and produce cooperativity among calcium binding sites on different RyRs. Such allosteric coupling between RyRs may be a function of the foot process and lattice array, explaining their conservation during evolution. PMID:10051521

Stern, Michael D.; Song, Long-Sheng; Cheng, Heping; Sham, James S.K.; Yang, Huang Tian; Boheler, Kenneth R.; Rios, Eduardo

1999-01-01

99

Dirac eigenmodes at the QCD Anderson transition  

E-print Network

Recently we found an Anderson-type localization-delocalization transition in the QCD Dirac spectrum at high temperature. Using spectral statistics we obtained a critical exponent compatible with that of the corresponding Anderson model. Here we study the spatial structure of the eigenmodes both in the localized and the transition region. Based on previous studies in the Anderson model, at the critical point, the eigenmodes are expected to have a scale invariant multifractal structure. We verify the scale invariance of Dirac eigenmodes at the critical point.

Matteo Giordano; Tamas G. Kovacs; Ferenc Pittler; Laszlo Ujfalusi; Imre Varga

2014-10-30

100

Localized vibrational and electronic excitations of impurities in compound semiconductors  

NASA Astrophysics Data System (ADS)

Two types of localized vibrational modes of oxygen substituting for Te in CdTe, i.e., OTe, are reported. In one, OTe is associated with a nearest neighbor (NN) vacancy as a (OTe - VCd) center and hence with C3v symmetry, with its uniaxial axis along <111>, whereas in the other O Te is surrounded by all the four NN Cd's and thus possesses Td site symmetry. By an appropriate control of stoichiometry it is possible to reproducibly generate the formation of either (OTe - VCd) or OTe centers. These configurations are deduced from their ultrahigh resolution infrared signatures. For the (O Te - VCd) centers, consistent with their uniaxial symmetry, a pair of sharp local vibrational modes (LVM) are observed at n1 = 1096.78 cm-1 and n2 = 1108.35 cm-1, the latter nearly twice as intense as the former. In the LVM spectrum of OTe centers with the full complement of NN Cd's, consistent with its Td symmetry, only one LVM signature appears at n0 = 349.79 cm-1. With the increasing temperature, n1 and n2 approach each other and coalesce into a single triply degenerate line at n*0 for temperature T ? T* ˜ 300 K; the uniaxial (C3v) symmetry of (OTe - VCd) transforms to T d symmetry at T* and above, acquired by the (OTe - VCd) centers due to the increasing rate of bond switching among the four possible OTe - VCd <111> directions as T approaches T*. The (OTe - VCd) centers also display a fascinating pair of second harmonics including a coalescence at T* and beyond. We have discovered two types of localized vibrational modes (LVMs) of oxygen related defect centers in stoichiometrically controlled CdSe, a wurtzite crystal. In one, oxygen substitutionally replaces Cd (OCd) as an anti-site impurity with C3v site symmetry. Consistent with its uniaxial configuration, under relatively low resolution a pair of sharp LVMs is observed at mu1 = 1991.77 cm-1 and mu2 = 2001.3 cm-1. Under high resolution, both mu1 and mu2 display a remarkable fine structure which can be traced to the motion of the nearest neighbor Se atoms surrounding the OCd in which oxygen replacing Cd is an anti-site impurity. The host isotopic fine structure is strongly reminiscent of the LVMs of CdSe observed with MgCd impurities. In both cases, the fine structure is associated with nearest neighbor Se atoms set in vibratory motion by the LVMs of OCd or MgCd. In the other, oxygen substitutionally replaces Se (OSe) in the vicinity of a Cd vacancy, labeled as (OSe - VCd) centers, in which the nearest neighbor Cd vacancy occurs on one of three vertical planes of reflection on which OSe also lies. The center displays a local C s symmetry resulting in three infrared absorption peaks at gamma 1 = 1094.11 cm-1, gamma2 = 1107.45 cm -1, and gamma3 = 1126.33 cm-1. With increasing temperature, gamma1 and gamma2 approach each other and coalesce into a single doubly degenerate mode at T 1 ˜ 480 K; the Cs site symmetry of (OSe - VCd) thus transforms to C3v symmetry at higher temperatures, acquired by the increasing rate of bond switching among the three equivalent positions for VCd. At even higher temperatures, gamma3 merges with gamma1 and gamma2 into a single mode at T2 ˜ 560 K; the acquired C 3v site symmetry of (OSe - VCd) further transforms to a quasi-Td symmetry due to the same mechanism. The group IB impurities (Cu, Ag, and Au) incorporated into II-VI zinc blende hosts of ZnTe and CdTe exhibit well resolved excitation lines followed by a photoionization continuum in their infrared absorption spectra. They are associated with transitions from a "1s-like" ground state to various "p-like" excited state characteristic of a hole bound to a Coulomb center. Their spacing agree well with those predicted in the effective mass theory for single acceptors as expected for group IB elements substitutionally replacing the group IIB cations of the host. The occurrence of the simultaneous excitation of the Lyman transitions in combination with the zone center longitudinal optical phonon and hence lying in the photoionization continuum and displaying Fano-like asymme

Chen, Gang

101

Proposed signature of Anderson localization and correlation-induced delocalization in an N-leg optical lattice  

SciTech Connect

We propose a realization of the one-dimensional random dimer model and certain N-leg generalizations using cold atoms in an optical lattice. We show that these models exhibit multiple delocalization energies that depend strongly on the symmetry properties of the corresponding Hamiltonian, and we provide analytical and numerical results for the localization length as a function of energy. We demonstrate that the N-leg systems possess similarities with their one-dimensional ancestors but are demonstrably distinct. The existence of critical delocalization energies leads to dips in the momentum distribution that serve as a clear signal of the localization-delocalization transition. These momentum distributions are different for models with different group symmetries and are identical for those with the same symmetry.

Sedrakyan, T. A.; Kestner, J. P.; Das Sarma, S. [Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742 (United States); Joint Quantum Institute, Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)

2011-11-15

102

Modeling of ion-acoustic soliton excitation through decay process of a localized perturbation  

Microsoft Academic Search

The possibility of the nonlinear decay of a localized perturbation into the ion-acoustic solitons is studied. The present paper is a theoretical attempt to model the experimental soliton excitation [S. Yi et al., Phys. Plasmas 4, 2436 (1997)] in which solitons are excited by a grid modulating near the ion plasma frequency. It has been reported that a localized wave

H. Hakimi Pajouh; H. Abbasi

2008-01-01

103

Bulk and local elastic relaxation around optically excited centers  

NASA Astrophysics Data System (ADS)

The macroscopic refractive effect arising from an optically excited Cr3+ center in a Gd-Sc-Ga garnet crystal was observed and measured using time-resolved beam-deflection spectroscopy. The excited-state effect is much larger than the thermal effect. The predominant mechanism is concluded to be the refractive effect stemming from the elastic dilation of the CrO6 cluster in the excited 4T2 state of Cr3+. The bulk expansion per excited ion is ~=12 Aṧ. An expansion of ~=0.13 Å of the oxygen coordination sphere is derived in the approximation of an isotropic elastic continuum and a fully symmetric dilation. This displacement is in agreement with the optical spectra in the framework of the configuration coordinate model.

Strauss, Eugen

1990-08-01

104

Local low-energy electrical excitation of localized and propagating surface plasmons with a scanning tunneling microscope  

NASA Astrophysics Data System (ADS)

The highly confined nature of the fields from surface plasmons makes them excellent candidates for future nano-optical devices. Most often, optical excitation is used to excite surface plasmons. However, a local, low energy, electrical method for surface plasmon excitation would be preferable for device applications. The scanning tunneling microscope (STM) is an ideal, low energy, local source of electrons that can excite both localized (LSP) and propagating surface plasmons (SPP). Its local nature, along with the ability to precisely position the excitation source and the absence of any background light from the excitation are essential for our experiments. We have used this technique to locally excite surface plasmons on a variety of metal structures. In our setup, the STM is coupled to an inverted optical microscope and the resulting emitted light is collected through the glass substrate. In such a configuration, both the light emitted from localized plasmons as well as the leakage radiation from propagating surface plasmons may be recorded. Both real plane (spatial information) and Fourier plane (angular information) images may be obtained, as well as emission spectra. In this article we will present the results of STM-SPP excitation on thin Au films on glass and investigate the effect of Au film thickness on the SPP propagation length. These results demonstrate the unique features of STM-excited SPPs: the STM plasmon source may be considered equivalent to a series of oscillating vertical point dipoles, and the resulting plasmons consist of a 2D circular wave with a broadband spectrum. These properties are then exploited to study how SPPs scatter into photons from super and sub-wavelength sized holes. It is found that the larger the hole diameter, the more directional the scattering light. From a type of SPP-Young's experiment we determine that the orientation of the electric field is maintained when SPPs are scattered into photons at holes.

Boer-Duchemin, Elizabeth; Wang, Tao; Le Moal, Eric; Rogez, Benoît; Comtet, Geneviève; Dujardin, Gérald

2014-05-01

105

Excitation by Local Electric Fields in the Aurora and Airglow  

Microsoft Academic Search

We have developed a method for accurate calculation of the distribution of electron energies in the ionosphere under the influence of an electric field. From this calculation we can predict rates of excitation of radiating states of N., O., and O as a function of the strength of a hypothetical applied field. We find that it is unreasonable to expect

L. R. Megill; N. P. Carleton

1964-01-01

106

Local Excitation, Scattering, and Interference of Surface Plasmons  

Microsoft Academic Search

The optical probe of a scanning near-field optical microscope is shown to act as a point source of surface plasmon (SP) polaritons on gold and silver films. Plasmon excitation manifests itself by emission of light in the direction of the SP resonance angle, originating from an area with the shape of a dipole radiation pattern whose extension is given by

B. Hecht; H. Bielefeldt; L. Novotny; Y. Inouye; D. W. Pohl

1996-01-01

107

Determination of magnetic vortex chirality by local field excited gyration  

NASA Astrophysics Data System (ADS)

We show the chirality dependent dynamics of the single magnetic vortex in a submicron permalloy rectangle due to the symmetry breaking by a local magnetic field. For the clockwise (counter-clockwise) chirality, the local positive (negative) field leads to the softening of the gyrotropic mode of vortex core relative to the case of the homogeneous field, resulting in an asymmetric dependence of the gyrotropic frequency which depends on the vortex chirality. The gyrotropic frequency has strong correlation with the distance from the vortex core equilibrium position to the edge of the rectangle. We enlighten that the measurement of the gyrotropic frequency of single vortex under the local field can be an alternative way to determine the vortex chirality at room temperature.

Xie, Kaixuan; Lin, Weiwei; Zhang, Peng; Sang, Hai

2014-09-01

108

Controlling Light Confinement by Excitation of Localized Surface Plasmons  

NASA Astrophysics Data System (ADS)

Localized surface plasmons can be used to control near-field optical phenomena in the subwavelength range. Specifically, this chaper reviews recent results which show that localized surface plasmons can confine the optical intensity down to nanoscopic dimensions. The discussion first considers how a collection-mode near-field optical microscope can observe the squeezing of the plasmon field of metallic nanostructures deposited on a flat surface. Numerical simulations then provide illustrations of the confined fields associated with nanostructures which are feasible using current microfabrication techniques. Finally, we present arguments which explain how localized surface plasmons can deliver a significant amount of power to the very end of a tetrahedral tip used as the light source of an illumination-mode near-field optical microscope.

Fischer, Ulrich Ch.; Dereux, Alain; Weeber, Jean-Claude

109

Local excitations in thin metal films bounded by topological insulators  

NASA Astrophysics Data System (ADS)

Electromagnetic excitations arising in a metal slab surrounded by an insulator with a non-trivial topology associated to time reversal symmetry (topological insulator) are described. It is shown that the topological term induces modifications to the dispersion relations of bounding and antibounding surface modes in the long wavelength non-retarded limit which depend on the square of the topological term. In particular, it is shown that a backward wave arises with a group velocity undergoing a relative change which is independent of the film thickness. It is shown that the rotation of the polarization plane induced by the non-trivial topology is a linear function of the topological term for all slab thickness.

Granada E, J. C.; Rojas, D. F.

2014-12-01

110

Excitations are localized and relaxation is hierarchical in glass-forming liquids  

NASA Astrophysics Data System (ADS)

For several atomistic models of glass formers, at conditions below their glassy dynamics onset temperatures, To, we use importance sampling of trajectory space to study the structure, statistics and dynamics of excitations responsible for structural relaxation. Excitations are detected in terms of persistent particle displacements of length a. At supercooled conditions, for a of the order of or smaller than a particle diameter, we find that excitations are associated with correlated particle motions that are sparse and localized, occupying a volume with an average radius that is temperature independent and no larger than a few particle diameters. We show that the statistics and dynamics of these excitations are facilitated and hierarchical. Excitation energy scales grow logarithmically with a. Excitations at one point in space facilitate the birth and death of excitations at neighboring locations, and space-time excitation structures are microcosms of heterogeneous dynamics at larger scales. This nature of dynamics becomes increasingly dominant as temperature T is lowered. We show that slowing of dynamics upon decreasing temperature below To is the result of a decreasing concentration of excitations and concomitant growing hierarchical leng

Keys, Aaron; Hedges, Lester; Garrahan, Juan; Glotzer, Sharon; Chandler, David

2012-02-01

111

Bioinformatics Robert Anderson1  

E-print Network

Bioinformatics Robert Anderson1 and Zhiping Weng1,2 1. Bioinformatics Program 2. Department of Biomedical Engineering Boston University 44 Cummington Street Boston, MA 02215 What is Bioinformatics? Bioinformatics is the study of applying computational methods to large amount of biological information in order

Weng, Zhiping

112

The Anderson Quin Cycle  

SciTech Connect

The objective of this study was to make a more refined evaluation of the Anderson Quin Cycle based on most recent information on the performance of various elements that will be used in the Anderson Quin Cycle. My original estimate of the work plan for evaluating and optimizing the Anderson Quin Cycle called for 7000 man hours of work. Since this grant was limited to 2150 man hours, we could not expect to achieve all the objectives within the allotted period of work. However, the most relevant program objectives have been completed as reported here. The analysis generally confirms the results originally estimated in my paper on the subject. (Ref. 2) Further optimizations should show even higher efficiencies. The Anderson Quin Cycle (US Patent applied for) basically consists of 5 elements in the power cycle: A refrigeration system to cool and clean the inlet air before it enters the compressor that supplies air for the gas turbine; a gas turbine consisting of a compressor, combustor, and turbine; a steam boiler and steam turbine system using the heat from the exhaust gas out of the gas turbine; a vapor turbine cycle, which utilizes the condensed heat from the exhaust of the steam turbine and the exhaust gas heat leaving the steam boiler to operate a vapor turbine cycle which utilizes another fluid than water, in this case isobutane; and the fifth element consists of a gas cooler and heat pump system, which removes the heat from the exhaust gas to lower its temperature essentially to atmospheric temperature, and at the same time permits treatment of the exhaust gas to remove acid components such as sulfur dioxide and nitrogen oxides. Current industry accepted component characteristics were incorporated in the performance analysis of the overall cycle, ensuring accurate and meaningful operating predictions. The characteristics and performance of each of the elements are described. The thermal efficiency of the optimized calculated Anderson Quin Cycle is 62 percent.

Anderson, J.H.; Bilbow, W.M.

1993-03-18

113

Local bifurcations of synchronization in self-excited and forced unidirectionally coupled micromechanical resonators  

NASA Astrophysics Data System (ADS)

A unidirectionally coupled system of Microelectromechanical Systems (MEMS) resonators is investigated. Local bifurcations of both the single resonator and the coupled system are analyzed in the design of the coupled system. We discuss the behavior of the coupled system according to the change in the coupling parameter and the excitation force. Phenomena such as quasiperiodic oscillations and synchronization are shown by numerical simulations and studied analytically through perturbation methods. The coupled system shows oscillatory behavior without the excitation force. In the presence of the excitation force the coupled system exhibits complex behavior which can be beneficial in the design of the coupled system as a sensor.

Naik, Suketu; Hikihara, Takashi; Vu, Huy; Palacios, Antonio; In, Visarath; Longhini, Patrick

2012-02-01

114

Investigation of RF excited CW CO2 waveguide lasers local oscillator - RF excitation  

NASA Technical Reports Server (NTRS)

A new local oscillator housing was built which seems to have improved laser life. Laser cooling was changed from internal water cooling to the more convenient thermal contact cooling. At the present time, a conclusion can not be made if the 20 percent reduction in power output is the result of poorer cooling or poorer grating alignment. The coupling-starting network was improved from 55 to about 90 percent. It can be adjusted by varying trimmers C sub 1 and C sub 2 to match RF power levels between 10 and 30 W. If the laser admittance changes greatly with laser life rematching will have to be achieved by remote control for space applications. The same holds true if the RF power level has to be changed with a maximum efficiency constraint.

Hochuli, U.

1988-01-01

115

Resonance enhancement of difference-frequency generation through localized surface plasmon excitation  

NASA Astrophysics Data System (ADS)

We report the experimental observation of difference-frequency generation in gold nanoparticles under localized surface plasmon excitation. A zero-delay peak is detected in the differential transmission signal for a gold nanoparticle film with a MgF2 overlayer, showing that the energy transfer from pump light to probe light through the difference-frequency generation is resonantly enhanced by the excitation. This peak of differential transmission decreases in strength with higher probe fluences. Both the enhancement and the power dependence of the difference-frequency generation are explained by modeling the localized surface plasmons as a nonlinear Lorentz resonator.

Fang, Xu; Yaginuma, Shin; Kubo, Wakana; Tanaka, Takuo

2013-05-01

116

Excitation Energies Through the Locally Renormalized Equation-of-Motion Formalism: Singles and Doubles Model  

SciTech Connect

The stationary conditions obtained from approximate coupled-cluster functional derived from the Numerator-Denominator connected Expansion (NDC) [K. Kowalski, P. Piecuch, J Chem. Phys. 122 (2005) 074107] are employed to calculate the linear response of cluster amplitudes. A simple scheme that involves singly and doubly excited amplitudes, termed locally renormalized equation-of-motion approach with singles and doubles (LR-EOMCCSD), is compared with other excited-state methods that include up to two-body operators in the wavefunction expansion. In particular, the impact of the local denominators on the excitation energies is discussed in detail. Several benchmark calculations on the CH+, C?, N?, O?, CIOCI molecules are presented to illustrate the performance of the LR-EOMCCSD approach.

Kowalski, Karol

2006-09-28

117

Covalent bonding effect on the mean excitation energy of H2 with the local plasma model  

NASA Technical Reports Server (NTRS)

Chemical bonding is taken into account explicitly in the determination of the mean excitation energy (I) for stopping power of H2 with the local plasma approximation by employing molecular electronic wave functions for H2 for the first time. This procedure leads to a new value for IH2 that is higher than all accepted experimental and theoretical values.

Kamaratos, E.

1984-01-01

118

Localized Excited Charge Carriers Generate Ultrafast Inhomogeneous Strain in the Multiferroic BiFeO3  

E-print Network

Localized Excited Charge Carriers Generate Ultrafast Inhomogeneous Strain in the Multiferroic Bi to monitor the lattice dynamics in a thin film of multiferroic BiFeO3 after above-band-gap photoexcitation.05.cp, 77.22.Ej, 78.47.J- Multiferroics have a great potential for application due to their possible

Evans, Paul G.

119

J. Phys. Chem. B 1998, 102, 3310-3315 Localized Electronic Excitations in Phenylacetylene Dendrimers  

E-print Network

optical excitation of conjugated dendrimers (fractal antenna macromolecules) are shown to be localized be used in the design of artificial Light harvesting antennae with controlled energy funneling path- ways suggested as a artificial photonic antenna systems [10­13]. The spectral frequency profile of family A

Tretiak, Sergei

120

Excitations Are Localized and Relaxation Is Hierarchical in Glass-Forming Liquids  

NASA Astrophysics Data System (ADS)

For several atomistic models of glass formers, at conditions below their glassy-dynamics-onset temperatures, To, we use importance sampling of trajectory space to study the structure, statistics, and dynamics of excitations responsible for structural relaxation. Excitations are detected in terms of persistent particle displacements of length a. At supercooled conditions, for a of the order of or smaller than a particle diameter, we find that excitations are associated with correlated particle motions that are sparse and localized, occupying a volume with an average radius that is temperature-independent and no larger than a few particle diameters. We show that the statistics and dynamics of these excitations are facilitated and hierarchical. Excitation-energy scales grow logarithmically with a. Excitations at one point in space facilitate the birth and death of excitations at neighboring locations, and space-time excitation structures are microcosms of heterogeneous dynamics at larger scales. This nature of dynamics becomes increasingly dominant as temperature T is lowered. We show that slowing of dynamics upon decreasing temperature below To is the result of a decreasing concentration of excitations and concomitantly growing length scales for dynamical correlations that develop in a hierarchical manner, and further that the structural-relaxation time ? follows the parabolic law, log?(?/?o)=J2(1/T-1/To)2, for T

Keys, Aaron S.; Hedges, Lester O.; Garrahan, Juan P.; Glotzer, Sharon C.; Chandler, David

2011-10-01

121

Localized and propagating excitations in gapped phases of spin systems with bond disorder  

NASA Astrophysics Data System (ADS)

Using the conventional T-matrix approach, we discuss gapped phases in one-, two-, and three-dimensional (3D) spin systems (both with and without a long-range magnetic order) with bond disorder and with weakly interacting bosonic elementary excitations. This work is motivated by recent experimental and theoretical activity in spin-liquid-like systems with disorder and in the disordered interacting boson problem. In particular, we apply our theory to both paramagnetic low-field and fully polarized high-field phases in dimerized spin-1/2 systems and in integer-spin magnets with large single-ion easy-plane anisotropy D with disorder in exchange coupling constants (and/or D). The elementary excitation spectrum and the density of states are calculated in the first order in defects concentration c ?1. In 2D and 3D systems, the scattering on defects leads to a finite damping of all propagating excitations in the band except for states lying near its edges. We demonstrate that the analytical approach is inapplicable for states near the band edges and our numerical calculations reveal their localized nature. We find that the damping of propagating excitations can be much more pronounced in considered systems than in magnetically ordered gapless magnets with impurities. In 1D systems, the disorder leads to localization of all states in the band, while those lying far from the band edges (short-wavelength excitations) can look like conventional wave packets.

Utesov, O. I.; Sizanov, A. V.; Syromyatnikov, A. V.

2014-10-01

122

John Anderson Campus UNIVERSITY BUILDINGS  

E-print Network

John Anderson Campus UNIVERSITY BUILDINGS 1 McCance Building 2 Collins Building 3 Livingstone Tower Colville Building 21 John Anderson Building 22 Lord Hope Building 23 Curran Building (Library) 24 Birbeck Street NorthPortlandStreet George Street Martha St Cochrane St Ingram St George Street Bath Street

Mottram, Nigel

123

Testimony of James J. Anderson  

E-print Network

research over the past two decades has involved Columbia River salmon and the influence of the hydrosystem River salmon (Anderson 1995). That spring the salmon run in the Columbia River was the lowest ever and status of the fish populations of the Columbia River System. #12;2 My name is James Anderson; I am

Washington at Seattle, University of

124

Combined structures of single valued and multiple valued localized excitations in higher-dimensional soliton system  

NASA Astrophysics Data System (ADS)

In this Letter, we derive a quite universal formula, which is valid for many (2+1)-dimensional nonlinear physical models, by using extended homogeneous balance method. Based on the derived expression, we investigate the combined structures, i.e., semifolded solitary waves and semifoldons, of single valued and multiple valued localized excitations in higher-dimensional soliton system and their interactions both analytically and graphically. Some novel features or interesting behaviors are revealed.

Bai, Cheng-Lin; Bai, Cheng-Jie; Zhao, Hong

2006-08-01

125

Quantifying Anderson's fault types  

NASA Astrophysics Data System (ADS)

Anderson [1905] explained three basic types of faulting (normal, strike-slip, and reverse) in terms of the shape of the causative stress tensor and its orientation relative to the Earth's surface. Quantitative parameters can be defined which contain information about both shape and orientation [Célérier, 1995], thereby offering a way to distinguish fault-type domains on plots of regional stress fields and to quantify, for example, the degree of normal-faulting tendencies within strike-slip domains. This paper offers a geometrically motivated generalization of Angelier's [1979, 1984, 1990] shape parameters ? and ? to new quantities named A? and A?. In their simple forms, A? varies from 0 to 1 for normal, 1 to 2 for strike-slip, and 2 to 3 for reverse faulting, and A?/ranges from 0° to 60°, 60° to 120°, and 120° to 180°, respectively. After scaling, A? and A? agree to within 2% (or 1°), a difference of little practical significance, although A? has smoother analytical properties. A formulation distinguishing horizontal axes as well as the vertical axis is also possible, yielding an A? ranging from -3 to +3 and A? from -180° to +180°. The geometrically motivated derivation in three-dimensional stress space presented here may aid intuition and offers a natural link with traditional ways of plotting yield and failure criteria. Examples are given, based on models of Bird [1996] and Bird and Kong [1994], of the use of Anderson fault parameters A? and A? for visualizing tectonic regimes defined by regional stress fields.

Simpson, Robert W.

1997-08-01

126

Personal Statement Ryan Anderson  

E-print Network

experience was the excitement of discovery. I identified several unexpected emission lines and realized Waite in the department of Atmospheric, Oceanic and Space Sciences at the University of Michigan. I am is to inform the student body about exciting discoveries being made on campus, even if they do not have

Richardson Jr., James E.

127

Spatial organization of vegetation arising from non-local excitation with local inhibition in forests  

NASA Astrophysics Data System (ADS)

Pattern formation in the biogeosciences is not limited to consideration of granular and fluid phenomena, but also occurs due to interactions within ecological systems. Here we present a novel mechanism of non-local activation and local inhibition that arises in the dynamics of competition and predation associated with parent trees and their seedlings. These dynamics, known as the Janzen-Connell (JC) effect, arise when recruitment and growth of seedlings is positively correlated to the distance from the parent tree. Such effects generate highly organized vegetation biomass spatial patterns when coupled to a revised Fisher-Kolmogorov (FK) equation. Over a single generation, the revised FK model calculations predict a "hen and chicks" dynamic pattern with mature trees surrounded by new seedlings growing at characteristic spatial distances in agreement with field data. Over longer timescales, the importance of stochastic dynamics, such as those associated with randomly occurring light gaps, increase thereby causing a substantial deviation between predictions from the deterministic FK model and its stochastic counterpart derived to account for such random disturbances. At still longer timescales, however, statistical measures of the spatial organization, specifically the spatial density of mature trees and their minimum spacing, converge between the two model representations.

Thompson, S. E.; Katul, G. G.; Terborgh, J.; Alvarez-Loayza, P.

2009-12-01

128

Calculation of mean excitation energy and stopping cross section in the orbital local plasma approximation  

SciTech Connect

Extension of the kinetic theory of stopping, in the Oddershede-Sabin (OS) (At. Data Nucl. Data Tables 31, 275 (1984)) orbitally decomposed form, from gas phase to films and crystals generates the need for orbital mean excitation energies calculated within the local-spin-density approximation (LSDA) to density-functional theory (DFT), the preeminent theoretical model for such extended systems. In LSDA, the orbitals and orbital energies used in the construction of the electron density {rho} have no standing for estimation or calculation of excitation energies. As an alternative we propose an orbital density generalization of the local plasma approximation (LPA) of Lindhard and Scharff (K. Dan. Vidensk. Selsk. Mat. Fys. Medd. 27, No. 15 (1953)) that we test by calculation of mean excitation energies {ital I}{sub {ital k}} for each atomic orbital {ital k} within the LSDA for all atoms with {ital Z}{lt}37. Stopping cross sections for a representative sample (about half) of these elements have been calculated using these {ital I}{sub {ital k}} values. The results do not differ substantially from those of OS (who used {ital I}{sub {ital k}} values from Dehmer, Inokuti, and Saxon (Phys. Rev. A 12, 102 (1975)); Inokuti, Baer, and Dehmer ({ital ibid}. 17, 1229 (1978)); Inokuti, Dehmer, Baer, and Hanson ({ital ibid}. 23, 95 (1981))), with the discrepancy generally less than 15%.

Meltzer, D.E.; Sabin, J.R.; Trickey, S.B. (Quantum Theory Project, Department of Physics and Department of Chemistry, University of Florida, Gainesville, Florida 32611 (USA))

1990-01-01

129

Localization of nonlinear damage using state-space-based predictions under stochastic excitation  

NASA Astrophysics Data System (ADS)

This paper presents a study on localizing damage under stochastic excitation by state-space-based methods, where the damaged response contains some nonlinearity. Two state-space-based modeling algorithms, namely auto- and cross-predictions, are employed in this paper, and the greatest prediction error will be achieved at the sensor pair closest to the actual damage, in terms of localization. To quantify the distinction of prediction error distributions obtained at different sensor locations, the Bhattacharyya distance is adopted as the quantification metric. There are two lab-scale test-beds adopted as validation platforms, including a two-story plane steel frame with bolt loosening damage and a three-story benchmark aluminum frame with a simulated tunable crack. Band-limited Gaussian noise is applied through an electrodynamic shaker to the systems. Testing results indicate that the damage detection capability of the state-space-based method depends on the nonlinearity-induced high frequency responses. Since those high frequency components attenuate quickly in time and space, the results show great capability for damage localization, i.e., the highest deviation of Bhattacharyya distance is coincident with the sensors close to the physical damage location. This work extends the state-space-based damage detection method for localizing damage to a stochastically excited scenario, which provides the advantage of compatibility with ambient excitations. Moreover, results from both experiments indicate that the state-space-based method is only sensitive to nonlinearity-induced damage, thus it can be utilized in parallel with linear classifiers or normalization strategies to insulate the operational and environmental variability, which often affects the system response in a linear fashion.

Liu, Gang; Mao, Zhu; Todd, Michael; Huang, Zongming

2014-02-01

130

THE MARTIN ANDERSON-GRACIA ANDERSON ENDOWED SCHOLARSHIP  

E-print Network

: ________________________________________________________ _____________________________________ Telephone: ( ) ________________ E-Mail_________________ City State Zip Code EDUCATIONAL INFORMATION Are you-Gracia Anderson Endowed Scholarship at UCF. Finaid.ucf.edu UCF Television Friend/Family UCF Newspaper

Van Stryland, Eric

131

Localized excited charge carriers generate ultrafast inhomogeneous strain in the multiferroic BiFeO3.  

PubMed

We apply ultrafast x-ray diffraction with femtosecond temporal resolution to monitor the lattice dynamics in a thin film of multiferroic BiFeO3 after above-band-gap photoexcitation. The sound-velocity limited evolution of the observed lattice strains indicates a quasi-instantaneous photoinduced stress which decays on a nanosecond time scale. This stress exhibits an inhomogeneous spatial profile evidenced by the broadening of the Bragg peak. These new data require substantial modification of existing models of photogenerated stresses in BiFeO3: the relevant excited charge carriers must remain localized to be consistent with the data. PMID:24655276

Schick, Daniel; Herzog, Marc; Wen, Haidan; Chen, Pice; Adamo, Carolina; Gaal, Peter; Schlom, Darrell G; Evans, Paul G; Li, Yuelin; Bargheer, Matias

2014-03-01

132

Local deformation in hexagonal boron nitride crystal near the B K-shell ?-excitation  

NASA Astrophysics Data System (ADS)

Theoretical and experimental studies of the B K-shell absorption near the 0953-8984/10/9/020/img2-excitation in hexagonal boron nitride were carried out. The absorption spectrum over the interval 191.5-193.5 eV was analysed in the framework of the quasi-atomic model with respect to its molecular simulation and for the features of its recombination. Our analysis points to the appearance of local deformations in the crystal lattice around a core-excited atom which are mainly created by the breaking of the ground-state symmetry due to out-of-plane displacements of core-excited boron atoms in a basal plane (0.16 Å). The comparison with the experimental B K-shell absorption spectra for the metastable incoherent phase BN and defect-containing BN crystals supports this polaron mechanism. Methods for the description of the x-ray absorption in solids taking into account the related atomic rearrangement are discussed.

Pavlychev, A. A.; Franke, R.; Bender, St.; Hormes, J.

1998-03-01

133

Mean excitation energies for stopping powers in various materials using local plasma oscillator strengths  

NASA Technical Reports Server (NTRS)

The basic model of Lindhard and Scharff, known as the local plasma model, is used to study the effects on stopping power of the chemical and physical state of the medium. Unlike previous work with the local plasma model, in which individual electron shifts in the plasma frequency were estimated empirically, he Pines correction derived for a degenerate Fermi gas is shown herein to provide a reasonable estimate, even on the atomic scale. Thus, the model is moved to a complete theoretical base requiring no empirical adjustments, as characteristic of past applications. The principal remaining error is in the overestimation of the low-energy absorption properties that are characteristic of the plasma model in the region of the atomic discrete spectrum, although higher-energy phenomena are accurately represented, and even excitation-to-ionization ratios are given to fair accuracy. Mean excitation energies for covalent-bonded gases and solids, for ionic gases and crystals, and for metals are calculated using first-order models of the bonded states.

Wilson, J. W.; Xu, Y. J.; Kamaratos, E.; Chang, C. K.

1984-01-01

134

Localization of bleomycin in a single living cell using three-photon excitation microscopy  

NASA Astrophysics Data System (ADS)

Bleomycin has been used in the clinic as a chemotherapeutic agent for the treatment of several neoplasms, including non-Hodgkins lymphomas, squamous cell carcinomas, and testicular tumors. The effectiveness of bleomycin is believed to be derived from its ability to bind and oxidatively cleave DNA in the presence of a iron cofactor in vivo. A substantial amount of data on BLM has been collected, there is little information concerning the effects of bleomycin in living cells. In order to obtain data pertinent to the effects of BLM in intact cells, we have exploited the intrinsic fluorescence property of bleomycin to monitor the uptake of the drug in mammalian cells. We employed two light microscopy techniques, a wide-field and three-photon excitation (760 nm) fluorescence microscopy. Treatment of HeLa cells with bleomycin resulted in rapid to localization within the cells. In addition data collected from the wide field experiments, three-photon excitation of BLM which considerably reduced the phototoxic effect compared with UV light excitation in the wide-field microscopy indicated co-localization of the drug to regions of the cytoplasm occupied by the endoplasmic reticulum probe, DiOC5. The data clearly indicates that the cellular uptake of bleomycin after one minute includes the nucleus as well as in cytoplasm. Contrary to previous studies, which indicate chromosomal DNA as the target of bleomycin, the current findings suggest that the drug is distributed to many areas within the cell, including the endoplasmic reticulum, an organelle that is known to contain ribonucleic acids.

Abraham, Anil T.; Brautigan, David L.; Hecht, Sidney M.; Periasamy, Ammasi

2001-04-01

135

Three-dimensional Anderson transition for two electrons in two dimensions D. L. Shepelyansky  

E-print Network

localized states in, e.g., the 2D Anderson model, 2 l1 4 /V is the density of two-particle states directlyThree-dimensional Anderson transition for two electrons in two dimensions D. L. Shepelyansky Laboratoire de Physique Quantique, UMR 5626 du CNRS, Universite´ Paul Sabatier, F-31062 Toulouse Cedex 4

Shepelyansky, Dima

136

How local excitation-inhibition ratio impacts the whole brain dynamics.  

PubMed

The spontaneous activity of the brain shows different features at different scales. On one hand, neuroimaging studies show that long-range correlations are highly structured in spatiotemporal patterns, known as resting-state networks, on the other hand, neurophysiological reports show that short-range correlations between neighboring neurons are low, despite a large amount of shared presynaptic inputs. Different dynamical mechanisms of local decorrelation have been proposed, among which is feedback inhibition. Here, we investigated the effect of locally regulating the feedback inhibition on the global dynamics of a large-scale brain model, in which the long-range connections are given by diffusion imaging data of human subjects. We used simulations and analytical methods to show that locally constraining the feedback inhibition to compensate for the excess of long-range excitatory connectivity, to preserve the asynchronous state, crucially changes the characteristics of the emergent resting and evoked activity. First, it significantly improves the model's prediction of the empirical human functional connectivity. Second, relaxing this constraint leads to an unrealistic network evoked activity, with systematic coactivation of cortical areas which are components of the default-mode network, whereas regulation of feedback inhibition prevents this. Finally, information theoretic analysis shows that regulation of the local feedback inhibition increases both the entropy and the Fisher information of the network evoked responses. Hence, it enhances the information capacity and the discrimination accuracy of the global network. In conclusion, the local excitation-inhibition ratio impacts the structure of the spontaneous activity and the information transmission at the large-scale brain level. PMID:24899711

Deco, Gustavo; Ponce-Alvarez, Adrián; Hagmann, Patric; Romani, Gian Luca; Mantini, Dante; Corbetta, Maurizio

2014-06-01

137

Fluorescence imaging of local membrane electric fields during the excitation of single neurons in culture.  

PubMed Central

The spatial distribution of depolarized patches of membrane during the excitation of single neurons in culture has been recorded with a high spatial resolution (1 micron2/pixel) imaging system based on a liquid-nitrogen-cooled astronomical camera mounted on an inverted microscope. Images were captured from rat nodose neurons stained with the voltage-sensitive dye RH237. Conventional intracellular microelectrode recordings were made in synchrony with the images. During an action potential the fluorescence changes occurred in localized, unevenly distributed membrane areas, which formed clusters of depolarized sites of different sizes and intensities. When fast conductances were blocked by the addition of tetrodotoxin, a reduction in the number and the intensities of the depolarized sites was observed. The blockade by tetrodotoxin of voltage-clamped neurons also reduced the number of depolarized sites, although the same depolarizing voltage step was applied. Similarly, when a voltage-clamped neuron was depolarized by a constant-amplitude voltage step, the number of depolarized sites varied according to the degree of activation of the voltage-sensitive channels, which was modified by changing the holding potential. These results suggest that the spatial patterns of depolarization observed during excitation are related to the operations of ionic channels in the membrane. Images FIGURE 1 FIGURE 2 FIGURE 4 FIGURE 5 FIGURE 6 FIGURE 7 PMID:8527643

Gogan, P; Schmiedel-Jakob, I; Chitti, Y; Tyc-Dumont, S

1995-01-01

138

Localized, collective excitations in strongly interacting superfluids: Pseudovortices, vortices, solitons, and their physical implications  

NASA Astrophysics Data System (ADS)

Localized excitations form under many conditions in superfluids. Magnetic fields induce vortices in superconductors, while an out-of-equilibrium superfluid can create solitons, vortex rings, and vortices as the system returns to equilibrium. These nonlinear phenomena impact many experimental observables, and can also reveal information about the underlying superfluid. In this thesis I will address excitations in strongly interacting superfluids. First, I consider vortices which arise in high magnetic fields (for superconductors) and high rotation speeds (for neutral superfluids). Among the phenomena of interest, I will describe how vortex-like precursors can arise in the normal state of this system. I will show how these effects alter the behavior of quantum oscillations in superconductors, which may explain puzzling features of the high-Tc cuprates. Second, I will consider defects which arise from sudden perturbations of a superfluid. To do this I will discuss phase imprinting in ultracold, trapped Fermi gases, and identify a variety of defects that result. These defects relate to similar defects in superfluid helium, which are the components of quantum turbulence. I will also discuss why our numerical simulations using the time-dependent Ginzburg-Landau equation properly model the expected physical behavior. Finally, I will show how these defects, such as vortex rings and vortices, are highly transient with a complex but qualitatively understandable time evolution.

Scherpelz, Peter Jeremy

139

Locally focused 3D coronary imaging using volume-selective RF excitation.  

PubMed

This paper describes a locally focused magnetic resonance (MR) imaging method for three-dimensional (3D) zonal echoplanar coronary angiography using volume-selective radiofrequency (RF) excitation. Spatially variable resolution was used for delineating coronary arteries and reducing the effect of residual signals caused by the imperfect excitation profile of the RF pulse. The use of variable resolution enabled the derivation of basis functions having different spatial characteristics pertaining to regional object details, and a significantly smaller number of phase-encoded signal measurements was needed for image reconstruction. Based on the relative significance of each required phase-encoding step, real-time phase-encode reordering was used to minimize the effect of respiratory motion during coronary imaging. To eliminate Nyquist ghosting in oblique echoplanar imaging, the echoplanar data acquired during forward and reverse echoes were reconstructed separately and then averaged with spatial registration for improving the signal-to-noise ratio. The technique was evaluated with phantom experiments and right coronary artery images of 11 asymptomatic volunteers using a 0.5 T MR system. A marked improvement in image quality has been achieved despite a 30% reduction in imaging time. PMID:10025626

Yang, G Z; Burger, P; Gatehouse, P D; Firmin, D N

1999-01-01

140

Localized Excitation in the Hybridization Gap in YbAl{sub 3}  

SciTech Connect

The intermediate valence compound YbAl{sub 3} exhibits a broad magnetic excitation in the inelastic neutron scattering spectrum with characteristic energy E{sub 1}{approx_equal}50 meV, equal to the Kondo energy (T{sub K}{approx}600-700 K). In the low temperature (Tlocalized excitation in the hybridization gap.

Christianson, A.D.; Fanelli, V.R. [University of California, Irvine, California 92697 (United States); Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Lawrence, J.M. [University of California, Irvine, California 92697 (United States); Goremychkin, E.A. [Argonne National Laboratory, Argonne, Illinois 60439 (United States); ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX (United Kingdom); Osborn, R. [Argonne National Laboratory, Argonne, Illinois 60439 (United States); Bauer, E.D.; Sarrao, J.L.; Thompson, J.D. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Frost, C.D. [ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX (United Kingdom); Zarestky, J. L. [Ames Laboratory, Iowa State University, Ames, Iowa 50011 (United States)

2006-03-24

141

Enhanced transmission through subwavelength apertures by excitation of particle localized plasmons and nanojets  

E-print Network

We study, and illustrate with numerical calculations, transmission enhancement by subwavelength 2D slits due to the dominant role played by the excitation of the eigenmodes of plasmonic cylinders when they are placed at the aperture entrance; and also due to reinforced and highly localized energy in the slit as a consequence of the formation of a nanojet. We show that, providing the illumination is chosen such that an aperture transmitting eigenmode is generated, the phenomenon is independent of whether or not the slit alone produces extraordinary transmission; although in the former case this enhancement will add to this slit supertransmission. We address several particle sizes, and emphasize the universality of this phenomenon with different materials.

Valdivia-Valero, F J

2011-01-01

142

Enhanced transmission through subwavelength apertures by excitation of particle localized plasmons and nanojets.  

PubMed

We study, and illustrate with numerical calculations, transmission enhancement by subwavelength 2D slits due to the dominant role played by the excitation of the eigenmodes of plasmonic cylinders when they are placed at the aperture entrance; and also due to reinforced and highly localized energy in the slit as a consequence of the formation of a nanojet. We show that, providing the illumination is chosen such that an aperture transmitting eigenmode is generated, the phenomenon is independent of whether or not the slit alone produces extraordinary transmission; although in the former case this enhancement will add to this slit supertransmission. We address several particle sizes, and emphasize the universality of this phenomenon with different materials. PMID:21716386

Valdivia-Valero, F J; Nieto-Vesperinas, M

2011-06-01

143

GEOMETRIC CHARACTERIZATION OF INTERMITTENCY IN THE PARABOLIC ANDERSON MODEL  

E-print Network

, as t , the overwhelming contribution to the total mass x u(t, x) comes from a slowly increasing number of `islands' which are located far from each other. These `islands' are local regions of those high exceedances of the field and phrases. Parabolic Anderson problem, intermittency, random environment, quenched asymptotics, heat

König, Wolfgang

144

Probing Dynamically Tunable Localized Surface Plasmon Resonances of Film-Coupled Nanoparticles by Evanescent Wave Excitation  

PubMed Central

The localized surface plasmon resonance (LSPR) spectrum associated with a gold nanoparticle (NP) coupled to a gold film exhibits extreme sensitivity to the nano-gap region where the fields are tightly localized. The LSPR of an ensemble of film-coupled NPs can be observed using an illumination scheme similar to that used to excite the surface plasmon resonance (SPR) of a thin metallic film; however, in the present system, the light is used to probe the highly sensitive distance-dependent LSPR of the gaps between NPs and film rather than the delocalized SPR of the film. We show that the SPR and LSPR spectral contributions can be readily distinguished, and we compare the sensitivities of both modes to displacements in the average gap between a collection of NPs and the gold film. The distance by which the NPs are suspended in solution above the gold film is fixed via a thin molecular spacer layer, and can be further modulated by subjecting the NPs to a quasistatic electric field. The observed LSPR spectral shifts triggered by the applied voltage can be correlated with Angstrom scale displacements of the NPs, suggesting the potential for chip-scale or flow-cell plasmonic nanoruler devices with extreme sensitivity. PMID:22429053

Mock, Jack J.; Hill, Ryan T.; Tsai, Yu-Ju; Chilkoti, Ashutosh; Smith, David R.

2012-01-01

145

M D Anderson Cancer Center  

Cancer.gov

This proposal will establish a Small Animal Imaging Research Program (SAIRP) at The University of Texas M. D. Anderson Cancer Center. The proposed SAIRP will complement the existing institutional facility that provides small animal imaging services to NIH funded investigators. The broad goal of this SAIRP is to develop novel imaging approaches to solve cancer related biological questions and evaluate new cancer therapies.

146

Understanding localisation in QCD through an Ising-Anderson model  

E-print Network

Above the QCD chiral crossover temperature, the low-lying eigenmodes of the Dirac operator are localised, while moving up in the spectrum states become extended. This localisation/delocalisation transition has been shown to be a genuine second-order phase transition, in the same universality class as that of the 3D Anderson model. The existence of localised modes and the effective dimensional reduction can be tentatively explained as a consequence of local fluctuations of the Polyakov loop, that provide 3D on-site disorder, in analogy to the on-site disorder of the Anderson model. To test the viability of this explanation we study a 3D effective, Anderson-like model, with on-site disorder provided by the spins of a spin model, which mimics the Polyakov loop dynamics. Our preliminary results show that localised modes are present in the ordered phase, thus supporting the proposed mechanism for localisation in QCD.

Matteo Giordano; Tamas G. Kovacs; Ferenc Pittler

2014-10-23

147

Significant Dates 1796 Death of John Anderson  

E-print Network

Significant Dates 1796 Death of John Anderson Anderson's Institution founded 1823 Glasgow Mechanics the Scottish College, the two open books. In addition to the two books in chief there is a symbol new. To mark the bicentenary of the death of John Anderson and the birth of the institution, the University

Mottram, Nigel

148

The Anderson Quin Cycle. Final report  

Microsoft Academic Search

The objective of this study was to make a more refined evaluation of the Anderson Quin Cycle based on most recent information on the performance of various elements that will be used in the Anderson Quin Cycle. My original estimate of the work plan for evaluating and optimizing the Anderson Quin Cycle called for 7000 man hours of work. Since

J. H. Anderson; W. M. Bilbow

1993-01-01

149

Bose-Einstein condensation and many-body localization of rotational excitations of polar molecules following a microwave pulse  

NASA Astrophysics Data System (ADS)

We study theoretically the collective dynamics of rotational excitations of polar molecules loaded into an optical lattice in two dimensions. We explore the collective many-body phases that form following a microwave pulse. We show that, owing to the long-range interactions between molecules and energy conservation in this isolated system, the rotational excitations can form a Bose-Einstein condensate with long-range order, even for the natural (undressed) dipole interactions. This manifests itself as a divergent T2 coherence time of the rotational transition even in the presence of inhomogeneous broadening. The dynamical evolution of a dense gas of rotational excitations shows regimes of nonergodicity, characteristic of many-body localization and localization protected quantum order.

Kwasigroch, M. P.; Cooper, N. R.

2014-08-01

150

Complex solutions and novel complex wave localized excitations for the (2+1)-dimensional Boiti—Leon—Pempinelli system  

NASA Astrophysics Data System (ADS)

With the help of the symbolic computation system Maple, the Riccati equation mapping approach and a linear variable separation approach, a new family of complex solutions for the (2+1)-dimensional Boiti—Leon—Pempinelli system (BLP) is derived. Based on the derived solitary wave solution, some novel complex wave localized excitations are obtained.

Ma, Song-Hua; Xü, Gen-Hai; Zhu, Hai-Ping

2014-05-01

151

America's First Illustrator: Alexander Anderson  

NSDL National Science Digital Library

America has produced many notable wood engravers, but Alexander Anderson is one of the first to have name recognition. Born in 1775, he spent his lifetime crafting illustrations for books, periodicals, newspapers, and other commercial ephemera. This delightful digital collection from the New York Public Library brings together sixteen scrapbooks containing almost 10,000 wood engravings by Anderson. Visitors can click on the "Browse Source Titles" area to view the various volumes, and the subjects covered here are quite diverse. Even a cursory search returns dozens of cat engravings, illustrations of slaves, and lottery advertisements. For anyone with an interest in 19th century material culture, this collection is truly wonderful. It is worth making several return trips to get a full sense of the offerings here, and it is one that will bring new rewards upon each visit.

152

Formation of localized states and electronic excitation in solids during low-energy particle bombardment  

Microsoft Academic Search

The excitation of deep holes (2s, 2p, in Al) in collision cascades is known to be responsible for emission of high-energy secondary electrons from solids bombarded by fast particles. The excitation occurs above certain impact energy threshold ( ~ 800 eV in the case of Al) which is given by the minimum interatomic distance in the binary atomic collision needed

Z. Roubek

1993-01-01

153

Protected nanoaperture based on multi-excitation of the localized surface plasmon between a ridge nanoaperture and metal nanoparticle  

NASA Astrophysics Data System (ADS)

To protect a ridge nanoaperture from environmental rigors and to minimize losses created by a dielectric protection layer, we developed a multi-excited nanoaperture by combining a ridge nanoaperture with an aluminum nanoparticle. We observed that the aluminum nanoparticle propagated the optical field from the nanoaperture to the exit plane via plasmon coupling, which facilitated confinement of the optical field. Additionally, even when the exit plane of the multi-excited nanoaperture was covered with a dielectric protection layer, the aluminum nanoparticle still confined the optical field in a small, localized region. The resulting spot size from a pure ridge nanoaperture, covered with a protection layer, was 166 × 86 nm2 (full-width at half maximum) at a distance of 10 nm from the protection layer. For the protected multi-excited nanoaperture configuration, the spot size at the full-width at half maximum was 32 × 30 nm2 at a distance of 10 nm from the protection layer.

Lee, Won-Sup; Kim, Taeseob; Lim, Geon; Choi, Guk-Jong; Park, No-Cheol; Park, Young-Pil

2014-08-01

154

Predicting Accurate Electronic Excitation Transfer Rates via Marcus Theory with Boys or Edmiston-Ruedenberg Localized Diabatization  

PubMed Central

We model the triplet-triplet energy transfer experiments from the Closs group [G. L. Closs et al, JACS, 110, p. 2652 (1988)] using a combination of Marcus theory and either Boys or Edmiston-Ruedenberg localized diabatization. We show that relative and absolute rates of electronic excitation transfer may be computed successfully, as we find ?calc = 2.8 per C-C bond, compared with the experimental value ?exp = 2.6, for the case where both donor and acceptor occupy equatorial positions on a rigid cyclohexane bridge. This work highlights the power of using localized diabatization methods as a tool for modeling non-equilibrium processes. PMID:20446743

Sodt, Alex J.; Ratner, Mark A.

2010-01-01

155

Excitation of dark plasmons in metal nanoparticles by a localized emitter.  

SciTech Connect

We study theoretically a dipole emitter placed near a metal nanoparticle and near small chains of two and three nanoparticles. The emitter can efficiently excite dark, or nonradiative, surface-plasmon modes in the nanostructures, in addition to the well-known bright modes. In the case of coupled nanoparticles, the origins of the bright and dark modes can be understood in the context of plasmon hybridization. Excitation of dark modes in nanoparticle chains allows for subwavelength guiding of optical energy with no radiative losses and thus with improved propagation lengths.

Liu, M.; Lee, T.-W.; Gray, S.; Guyot-Sionnest, P.; Pelton, M.; Univ. of Chicago

2009-03-13

156

Investigation of local thermodynamic equilibrium in laser-induced plasmas: Measurements of rotational and excitation temperatures at long time scales  

NASA Astrophysics Data System (ADS)

We studied the rotational temperature of diatomic molecules in the context of laser induced plasma from a solid target. In particular, its temporal evolution is investigated at long time scales (? 30 ?s). The measured values are compared to ionic and atomic excitation temperatures and the issue of local thermodynamic equilibrium is discussed. The investigation was carried out using an aluminium oxide (Al2O3) target doped with titanium (Ti) and iron (Fe). The ionic and the atomic excitation temperatures are deduced from the Ti II lines and the Fe I lines respectively. For the molecular temperature, a temporally resolved study of the aluminium monoxide (AlO) blue-green spectrum was carried out. We show that underthese experimental conditions, a complete thermodynamic equilibrium is not reached for up to 50 ?s after the laser pulse. The plasma is identified as cold plasma, with two different temperatures: the electron kinetic temperature and the heavy species kinetic temperature.

Lam, Julien; Motto-Ros, Vincent; Misiak, Dimitri; Dujardin, Christophe; Ledoux, Gilles; Amans, David

2014-11-01

157

Current Focusing Sharpens Local Peaks of Excitation in Cochlear Implant Stimulation  

PubMed Central

Cochlear implant (CI) users’ spectral resolution is limited by the number of implanted electrodes, interactions between the electrodes, and the underlying neural population. Current steering has been proposed to increase the number of spectral channels beyond the number of physical electrodes, however, electric field interactions may limit CI users’ access to current-steered virtual channels (VCs). Current focusing (e.g. tripolar stimulation) has been proposed to reduce current spread and thereby reduce interactions. In this study, current steering and current focusing were combined in a four-electrode stimulation pattern, i.e. quadrupolar virtual channels (QPVCs). The spread of excitation was measured and compared between QPVC and Monopolar VC (MPVC) stimuli using a forward masking task. Results showed a sharper peak in the excitation pattern and reduced spread of masking for QPVC stimuli. Results from the forward masking study were compared with a previous study measuring VC discrimination ability and showed a weak relationship between spread of excitation and VC discriminability. The results suggest that CI signal processing strategies that utilize both current steering and current focusing might increase CI users’ functional spectral resolution by transmitting more channels and reducing channel interactions. PMID:20850513

Srinivasan, Arthi G.; Landsberger, David M.; Shannon, Robert V.

2010-01-01

158

Topological approximation of the nonlinear Anderson model  

NASA Astrophysics Data System (ADS)

We study the phenomena of Anderson localization in the presence of nonlinear interaction on a lattice. A class of nonlinear Schrödinger models with arbitrary power nonlinearity is analyzed. We conceive the various regimes of behavior, depending on the topology of resonance overlap in phase space, ranging from a fully developed chaos involving Lévy flights to pseudochaotic dynamics at the onset of delocalization. It is demonstrated that the quadratic nonlinearity plays a dynamically very distinguished role in that it is the only type of power nonlinearity permitting an abrupt localization-delocalization transition with unlimited spreading already at the delocalization border. We describe this localization-delocalization transition as a percolation transition on the infinite Cayley tree (Bethe lattice). It is found in the vicinity of the criticality that the spreading of the wave field is subdiffusive in the limit t ?+?. The second moment of the associated probability distribution grows with time as a power law ? t?, with the exponent ? =1/3 exactly. Also we find for superquadratic nonlinearity that the analog pseudochaotic regime at the edge of chaos is self-controlling in that it has feedback on the topology of the structure on which the transport processes concentrate. Then the system automatically (without tuning of parameters) develops its percolation point. We classify this type of behavior in terms of self-organized criticality dynamics in Hilbert space. For subquadratic nonlinearities, the behavior is shown to be sensitive to the details of definition of the nonlinear term. A transport model is proposed based on modified nonlinearity, using the idea of "stripes" propagating the wave process to large distances. Theoretical investigations, presented here, are the basis for consistency analysis of the different localization-delocalization patterns in systems with many coupled degrees of freedom in association with the asymptotic properties of the transport.

Milovanov, Alexander V.; Iomin, Alexander

2014-06-01

159

Reactive and internal contributions to the thermal conductivity of local thermodynamic equilibrium nitrogen plasma: The effect of electronically excited states  

SciTech Connect

Internal and reactive contributions to the thermal conductivity of a local thermodynamic equilibrium nitrogen plasma have been calculated using the Chapman-Enskog method. Low-lying (LL) electronically excited states (i.e., states with the same principal quantum number of the ground state) and high-lying (HL) ones (i.e., states with principal quantum number n> 2) have been considered. Several models have been developed, the most accurate being a model that treats the LL states as separate species while disregarding the presence of HL states, on account of their enormous transport cross sections.

Bruno, D.; Colonna, G.; Laricchiuta, A. [CNR IMIP Bari, Bari (Italy); Capitelli, M. [CNR IMIP Bari, Bari (Italy); Department of Chemistry, University of Bari, Bari, Italy and CNR IMIP Bari, Bari (Italy)

2012-12-15

160

The large connectivity limit of the Anderson model on tree graphs  

NASA Astrophysics Data System (ADS)

We consider the Anderson localization problem on the infinite regular tree. Within the localized phase, we derive a rigorous lower bound on the free energy function recently introduced by Aizenman and Warzel. Using a finite volume regularization, we also derive an upper bound on this free energy function. This yields upper and lower bounds on the critical disorder such that all states at a given energy become localized. These bounds are particularly useful in the large connectivity limit where they match, confirming the early predictions of Abou-Chacra, Anderson, and Thouless.

Bapst, Victor

2014-09-01

161

Dual effect of local anesthetics on the function of excitable rod outer segment disk membrane  

SciTech Connect

The effects of local anesthetics and a divalent cation, Ca2+, on the function of rhodopsin were estimated from the measurements of light-induced proton uptake. The light-induced proton uptake by rhodopsin in the rod outer segment disk membrane was enhanced at lower pH (4) but depressed at higher pHs (6 to 8) by the tertiary amine local anesthetics lidocaine, bupivacaine, tetracaine, and dibucaine. The order of local anesthetic-induced depression of the proton uptake followed that of their clinical anesthetic potencies. The depression of the proton uptake versus the concentration of the uncharged form of local anesthetic nearly describes the same curve for small and large dose of added anesthetic. Furthermore, a neutral local anesthetic, benzocaine, depressed the proton uptake at all pHs between 4 and 7. These results indicate that the depression of the proton uptake is due to the effect of only the uncharged form. It is hypothesized that the uncharged form of local anesthetics interacts hydrophobically with the rhodopsin in the disk membrane. The dual effect of local anesthetics on the proton uptake, on the other hand, suggests that the activation of the function of rhodopsin may be caused by the charged form. There was no significant change in the light-induced proton uptake by rhodopsin when 1 mM of Ca2+ was introduced into the disk membrane at varying pHs in the absence or presence of local anesthetics. This fact indicates that Ca2+ ion does not influence the diprotonating process of metarhodopsin; neither does it interfere with the local anesthetic-induced changes in the rhodopsin molecule.

Mashimo, T.; Abe, K.; Yoshiya, I.

1986-04-01

162

Nanoscale spin reversal by non-local angular momentum transfer following ultrafast laser excitation in ferrimagnetic GdFeCo  

NASA Astrophysics Data System (ADS)

Ultrafast laser techniques have revealed extraordinary spin dynamics in magnetic materials that equilibrium descriptions of magnetism cannot explain. Particularly important for future applications is understanding non-equilibrium spin dynamics following laser excitation on the nanoscale, yet the limited spatial resolution of optical laser techniques has impeded such nanoscale studies. Here we present ultrafast diffraction experiments with an X-ray laser that probes the nanoscale spin dynamics following optical laser excitation in the ferrimagnetic alloy GdFeCo, which exhibits macroscopic all-optical switching. Our study reveals that GdFeCo displays nanoscale chemical and magnetic inhomogeneities that affect the spin dynamics. In particular, we observe Gd spin reversal in Gd-rich nanoregions within the first picosecond driven by the non-local transfer of angular momentum from larger adjacent Fe-rich nanoregions. These results suggest that a magnetic material’s microstructure can be engineered to control transient laser-excited spins, potentially allowing faster (~ 1?ps) spin reversal than in present technologies.

Graves, C. E.; Reid, A. H.; Wang, T.; Wu, B.; de Jong, S.; Vahaplar, K.; Radu, I.; Bernstein, D. P.; Messerschmidt, M.; Müller, L.; Coffee, R.; Bionta, M.; Epp, S. W.; Hartmann, R.; Kimmel, N.; Hauser, G.; Hartmann, A.; Holl, P.; Gorke, H.; Mentink, J. H.; Tsukamoto, A.; Fognini, A.; Turner, J. J.; Schlotter, W. F.; Rolles, D.; Soltau, H.; Strüder, L.; Acremann, Y.; Kimel, A. V.; Kirilyuk, A.; Rasing, Th.; Stöhr, J.; Scherz, A. O.; Dürr, H. A.

2013-04-01

163

Global Optimization with Coupled Local Minimizers Excited by Gaussian White Noise  

E-print Network

, decreasing mutation rate in genetic algorithms), and combining good candidates of solutions such as crossover- age ensemble energy of the individual local minimizers, and the hard and soft constraints

164

The interplay between localized and propagating plasmonic excitations tracked in space and time.  

PubMed

In this work, the mutual coupling and coherent interaction of propagating and localized surface plasmons within a model-type plasmonic assembly is experimentally demonstrated, imaged, and analyzed. Using interferometric time-resolved photoemission electron microscopy the interplay between ultrashort surface plasmon polariton wave packets and plasmonic nanoantennas is monitored on subfemtosecond time scales. The data reveal real-time insights into dispersion and localization of electromagnetic fields as governed by the elementary modes determining the functionality of plasmonic operation units. PMID:24702430

Lemke, Christoph; Leissner, Till; Evlyukhin, Andrey; Radke, Jörn W; Klick, Alwin; Fiutowski, Jacek; Kjelstrup-Hansen, Jakob; Rubahn, Horst-Günter; Chichkov, Boris N; Reinhardt, Carsten; Bauer, Michael

2014-05-14

165

Dynamic Localization of Electronic Excitation in Photosynthetic Complexes Revealed with Chiral Two-Dimensional Spectroscopy  

PubMed Central

Time-resolved ultrafast optical probes of chiral dynamics provide a new window allowing us to explore how interactions with such structured environments drive electronic dynamics. Incorporating optical activity into time-resolved spectroscopies has proven challenging due to the small signal and large achiral background. Here, we demonstrate that two-dimensional electronic spectroscopy can be adapted to detect chiral signals and that these signals reveal how excitations delocalize and contract following excitation. We dynamically probe the evolution of chiral electronic structure in the light harvesting complex 2 of purple bacteria following photoexcitation by creating a chiral two-dimensional mapping. The dynamics of the chiral two-dimensional signal directly reports on changes in the degree of delocalization of the excitonic state following photoexcitation. The mechanism of energy transfer in this system may enhance transfer probability due to the coherent coupling among chromophores while suppressing fluorescence that arises from populating delocalized states. This generally applicable spectroscopy will provide an incisive tool to probe ultrafast transient molecular fluctuations that are obscured in non-chiral experiments. PMID:24504144

Fidler, Andrew F.; Singh, Ved P.; Long, Phillip D.; Dahlberg, Peter D.; Engel, Gregory S.

2014-01-01

166

Taking on Titan: Meet Carrie Anderson  

NASA Video Gallery

When she was a little girl, Carrie Anderson dreamed of becoming an astronomer. Now, as a space scientist at NASA Goddard Space Flight Center, Carrie studies the atmosphere on Titan: one of Saturn's...

167

Locally Renormalized Coupled-Cluster Equations for Singly and Doubly Excited Clusters  

SciTech Connect

The Numerator-Denominator Connected (NDC) Expansion for the Coupled-Cluster (CC) method [K. Kowalski, P. Piecuch, J. Chem. Phys. 122 (2005) 074107], is used to construct a new set of stationary conditions for approximate coupled-cluster approaches. Several CC approximations based on models involving singles and doubles (CCSD) as well as singles, doubles, and triples (CCSDT) are developed and discussed in the context of ground-state applications. The resulting locally-renormalized CCSD (LR-CCSD) and CCSDT (LR-CCSDT) equations are shown to regularize the expressions for the cluster amplitudes in the challenging situations that occur when the orbital energy differences approach zero. Affordable schemes for handling the local denominators (all-holes-Jn coupling), that naturally appear in locally renormalized formalisms, are also discussed.

Kowalski, Karol

2006-07-10

168

Excite Travel  

NSDL National Science Digital Library

Excite Travel is one of the most comprehensive international guides to communities around the world. Excite Travel provides easy and timely access to information on travel, entertainment, and local business, plus government and community services for all regions of the world.

1998-01-01

169

LTP is accompanied by an enhanced local excitability of pyramidal neuron dendrites  

Microsoft Academic Search

The propagation and integration of signals in the dendrites of pyramidal neurons is regulated, in part, by the distribution and biophysical properties of voltage-gated ion channels. It is thus possible that any modification of these channels in a specific part of the dendritic tree might locally alter these signaling processes. Using dendritic and somatic whole-cell recordings, combined with calcium imaging

Andreas Frick; Jeffrey Magee; Daniel Johnston

2004-01-01

170

Localized Electronic Excitations in Phenylacetylene Dendrimers Sergei Tretiak, Vladimir Chernyak, and Shaul Mukamel*  

E-print Network

(fractal antenna macromolecules) are shown to be localized within segments connected by benzene rings by the optical field. The present approach may be used in the design of artificial light-harvesting antennae the core (see Figure 1). These macromolecules have been suggested as artificial photonic antennae.7

Mukamel, Shaul

171

Spectroscopic manifestations of local crystal distortions in excited 4f states in crystals of huntite structure  

SciTech Connect

Optical absorption spectra of YbAl{sub 3}(BO{sub 3}){sub 4}, TmAl{sub 3}(BO{sub 3}){sub 4} and TbFe{sub 3}(BO{sub 3}){sub 4} trigonal crystals have been studied in temperature range 2-300 K. Temperature behavior of absorption lines parameters has shown, that during some f-f transitions the local environment of rare earth ions undergo distortions, which are absent in the ground state.

Malakhovskii, A. V., E-mail: malakha@iph.krasn.ru [Russian Academy of Sciences, L. V. Kirensky Institute of Physics Siberian Branch (Russian Federation); Gnatchenko, S. L.; Kachur, I. S.; Piryatinskaya, V. G. [National Academy of Sciences of Ukraine, B. Verkin Institute for Low Temperature Physics and Engineering (Ukraine)] [National Academy of Sciences of Ukraine, B. Verkin Institute for Low Temperature Physics and Engineering (Ukraine); Sukhachev, A. L.; Sokolov, A. E.; Strokova, A. Ya.; Kartashev, A. V.; Temerov, V. L. [Russian Academy of Sciences, L. V. Kirensky Institute of Physics Siberian Branch (Russian Federation)] [Russian Academy of Sciences, L. V. Kirensky Institute of Physics Siberian Branch (Russian Federation)

2013-01-15

172

Noniterative Inclusion of the Triply and Quadruply Excited Clusters: The Locally Renormalized Perspective  

SciTech Connect

Noniterative inclusion of the higher=order clusters has been a subject of intensive studies aimed at developing a well balanced description of individual many-body contributions for entire ground-state potential energy surfaces. In traditional approaches, the connected quadruples are estimated directly based on perturbative arguments, which leads to excellent agreement with full CI results near the equilibrium geometry and increasingly worse energies for larger internuclear stretches. As a possible improvement to this situation, two techniques are considered as especially promising: perturbative approaches based on the similarity transformed Hamiltonians and renormalization schemes both in global and local formulation. Following the latter strategy we adopted the recently introduced Numerator-Denominator Connected expansion (NDC) [ K. Kowalski, P. Piecuch, J. Chem. Phys. 122 (2005) [074107] as an effective tool for designing new forms of noniterative corrections accounting for the joint effect of triples and quadruples. The performance of the ensuing locally renormalized CCSD(TQ) approaches (LR-CCSD(TQ) is illustrated on several examples that require either going beyond the triples approximation or describing very subtle effects encountered in Van der Waals complexes. Comparisons with other noniterative approaches are also made and some issues regarding the size-extensivity of the locally renormalized methods are addressed.

Kowalski, Karol; De Jong, Wibe A.

2006-08-31

173

Exciter switch  

NASA Technical Reports Server (NTRS)

A new exciter switch assembly has been installed at the three DSN 64-m deep space stations. This assembly provides for switching Block III and Block IV exciters to either the high-power or 20-kW transmitters in either dual-carrier or single-carrier mode. In the dual-carrier mode, it provides for balancing the two drive signals from a single control panel located in the transmitter local control and remote control consoles. In addition to the improved switching capabilities, extensive monitoring of both the exciter switch assembly and Transmitter Subsystem is provided by the exciter switch monitor and display assemblies.

Mcpeak, W. L.

1975-01-01

174

MgB2 nonlinear properties investigated under localized high rf magnetic field excitation  

NASA Astrophysics Data System (ADS)

The high transition temperature and low surface resistance of MgB2 attracts interest in its potential application in superconducting radio frequency accelerating cavities. However, compared to traditional Nb cavities, the viability of MgB2 at high rf fields is still open to question. Our approach is to study the nonlinear electrodynamics of the material under localized rf magnetic fields. Because of the presence of the small superconducting gap in the ? band, the nonlinear response of MgB2 at low temperature is potentially complicated compared to a single-gap s-wave superconductor such as Nb. Understanding the mechanisms of nonlinearity coming from the two-band structure of MgB2, as well as extrinsic sources of nonlinearity, is an urgent requirement. A localized and strong rf magnetic field, created by a magnetic write head, is integrated into our nonlinear-Meissner-effect scanning microwave microscope [T. Tai , IEEE Trans. Appl. Supercond. 21, 2615 (2011)ITASE91051-822310.1109/TASC.2010.2096531]. MgB2 films with thickness 50 nm, fabricated by a hybrid physical-chemical vapor deposition technique on dielectric substrates, are measured at a fixed location and show a strongly temperature-dependent third harmonic response. We propose that several possible mechanisms are responsible for this nonlinear response.

Tai, Tamin; Ghamsari, B. G.; Tan, T.; Zhuang, C. G.; Xi, X. X.; Anlage, Steven M.

2012-12-01

175

Excitation of electron cyclotron harmonic waves in the inner Saturn magnetosphere within local plasma injections  

NASA Astrophysics Data System (ADS)

Strong electron cyclotron harmonic (ECH) waves have been observed by Cassini associated with local plasma injection regions in the Saturnian magnetosphere. Using measured electron distributions from the Cassini plasma spectrometer, we calculated local growth rates and path-integrated wave gain of ECH waves inside an injection event using the HOTRAY code. We showed that electrons with energy near a few eV have a collision frequency comparable to their bounce frequency; thus, they cannot have an empty loss cone. We then demonstrated that the growth of ECH waves inside the injection event can be driven by electron phase space density gradients associated with the loss cone distribution of injected electrons at energies between a few hundred eV and a few keV. This conclusion is contrary to previous results that the source of free energy for growth of ECH waves is provided by electrons near a few eV. Results in this work are helpful for understanding the generation of ECH waves and their roles in electron dynamics in the Saturnian magnetosphere.

Tao, X.; Thorne, R. M.; Horne, R. B.; Grimald, S.; Arridge, C. S.; Hospodarsky, G. B.; Gurnett, D. A.; Coates, A. J.; Crary, F. J.

2010-12-01

176

Quantum Criticality of Quasi-One-Dimensional Topological Anderson Insulators  

NASA Astrophysics Data System (ADS)

We present an analytic theory of quantum criticality in the quasi-one-dimensional topological Anderson insulators of class AIII and BDI. We describe the systems in terms of two parameters (g, ?) representing localization and topological properties, respectively. Surfaces of half-integer valued ? define phase boundaries between distinct topological sectors. Upon increasing system size, the two parameters exhibit flow similar to the celebrated two-parameter flow describing the class A quantum Hall insulator. However, unlike the quantum Hall system, an exact analytical description of the entire phase diagram can be given. We check the quantitative validity of our theory by comparison to numerical transfer matrix computations.

Altland, Alexander; Bagrets, Dmitry; Fritz, Lars; Kamenev, Alex; Schmiedt, Hanno

2014-05-01

177

Local Control Model of Excitation-Contraction Coupling in Skeletal Muscle  

PubMed Central

This is a quantitative model of control of Ca2+ release from the sarcoplasmic reticulum in skeletal muscle, based on dual control of release channels (ryanodine receptors), primarily by voltage, secondarily by Ca2+ (Ríos, E., and G. Pizarro. 1988. NIPS. 3:223–227). Channels are positioned in a double row array of between 10 and 60 channels, where exactly half face voltage sensors (dihydropyridine receptors) in the transverse (t) tubule membrane (Block, B.A., T. Imagawa, K.P. Campbell, and C. Franzini-Armstrong. 1988. J. Cell Biol. 107:2587–2600). We calculate the flux of Ca2+ release upon different patterns of pulsed t-tubule depolarization by explicit stochastic simulation of the states of all channels in the array. Channels are initially opened by voltage sensors, according to an allosteric prescription (Ríos, E., M. Karhanek, J. Ma, A. González. 1993. J. Gen. Physiol. 102:449–482). Ca2+ permeating the open channels, diffusing in the junctional gap space, and interacting with fixed and mobile buffers produces defined and changing distributions of Ca2+ concentration. These concentrations interact with activating and inactivating channel sites to determine the propagation of activation and inactivation within the array. The model satisfactorily simulates several whole-cell observations, including kinetics and voltage dependence of release flux, the “paradox of control,” whereby Ca2+-activated release remains under voltage control, and, most surprisingly, the “quantal” aspects of activation and inactivation (Pizarro, G., N. Shirokova, A. Tsugorka, and E. Ríos. 1997. J. Physiol. 501:289–303). Additionally, the model produces discrete events of activation that resemble Ca2+ sparks (Cheng, H., M.B. Cannell, and W.J. Lederer. 1993. Science (Wash. DC). 262:740–744). All these properties result from the intersection of stochastic channel properties, control by local Ca2+, and, most importantly, the one dimensional geometry of the array and its mesoscopic scale. Our calculations support the concept that the release channels associated with one face of one junctional t-tubule segment, with its voltage sensor, constitute a functional unit, termed the “couplon.” This unit is fundamental: the whole cell behavior can be synthesized as that of a set of couplons, rather than a set of independent channels. PMID:9379173

Stern, Michael D.; Pizarro, Gonzalo; Rios, Eduardo

1997-01-01

178

Aakre Caitlyn Elementary Education Anderson Courtney Elementary Education  

E-print Network

EDUCATION Aakre Caitlyn Elementary Education Anderson Courtney Elementary Education Anderson Sarah Elementary Education Bailey Molly Elementary Education Barber Elizabeth Elementary Education Bechtold Ryan Elementary Education Bigelow Katrina Elementary Education Bigelow Katrina Elementary Education Bradford

Maxwell, Bruce D.

179

MD Anderson study finds side effects, complications, and mastectomy are more likely after partial breast irradiation:  

Cancer.gov

Accelerated partial breast irradiation (APBI) brachytherapy, the localized form of radiation therapy growing increasingly popular as a treatment choice for women with early-stage breast cancer, is associated with higher rate of later mastectomy, increased radiation-related toxicities and post-operative complications, compared to traditional whole breast irradiation (WBI), according to researchers from The University of Texas MD Anderson Cancer Center.

180

Professions Shannon Anderson, Ph.D.  

E-print Network

230 Science Concepts (Intro Bio I) 1 Biol 240 Introductory Biology II & Lab 5 Sci 240 Science ConceptsHealth Professions at SFSU #12;Shannon Anderson, Ph.D. Instructor, Biology Department Health Assistant Nurse-Practitioner Dental Hygiene Veterinary Medicine Allied Health Careers #12;Sneak

181

N. Charles Anderson Detroit Urban League, Inc.  

E-print Network

N. Charles Anderson Detroit Urban League, Inc. C. Patrick Babcock Class of 1969 W.K. Kellogg Children's Hospital of Michigan Louise Guyton Comerica, Inc. Paul L. Hubbard Class of 1971 Angela Kennedy Class of 1966 Guadalupe G. Lara Class of 1976 Mohamed Okdie Class of 1985 President, Mental Health Board

Cinabro, David

182

N. Charles Anderson Detroit Urban League, Inc.  

E-print Network

N. Charles Anderson Detroit Urban League, Inc. C. Patrick Babcock Class of 1969 W.K. Kellogg Children's Hospital of Michigan Louise Guyton Comerica, Inc. Paul L. Hubbard Class of 1971 Dennis R. Jacobs, PhD Pres. and Chief Exec. Officer NewPASSAGES Angela Kennedy Class of 1966 Guadalupe G. Lara Class

Cinabro, David

183

N. Charles Anderson Detroit Urban League, Inc.  

E-print Network

Louise Guyton Comerica, Inc. Paul L. Hubbard Class of 1971 Angela Kennedy Class of 1966 Guadalupe G. LaraN. Charles Anderson Detroit Urban League, Inc. C. Patrick Babcock Class of 1969 W.K. Kellogg of Social Work Board of Visitors Paul E. Massaron Annetta Miller Jacquelin E. Washington Irvin D. Reid, ex

Cinabro, David

184

Administration Noma Bennett Anderson, PhD  

E-print Network

D Department of Occupational Therapy Chair (Interim) Ann Nolen, PsyD Vice Chair Lawrence Faulkner, PhAdministration Dean Noma Bennett Anderson, PhD Assistant Deans Faculty and Academic Affairs RebeccaD Department of Physical Therapy Chair and Program Director CarolCountLikens,PT,PhD,MBA Department of Physician

Cui, Yan

185

Anderson-Gruneisen parameter for ionic solids  

Microsoft Academic Search

The isothermal Anderson-Gruneisen parameter delta T has been investigated for some ionic crystals employing the interaction approach. The necessary general expression has been developed in terms of various thermodynamic properties of ionic crystals and tested with the help of the well established Born-Mayer potential energy function. The results are compared with indirect experimental values of delta T available in the

M. N. Sharma; C. L. Gupta; A. K. Bhattacharya

1980-01-01

186

The Anderson Quin Cycle. Final report  

SciTech Connect

The objective of this study was to make a more refined evaluation of the Anderson Quin Cycle based on most recent information on the performance of various elements that will be used in the Anderson Quin Cycle. My original estimate of the work plan for evaluating and optimizing the Anderson Quin Cycle called for 7000 man hours of work. Since this grant was limited to 2150 man hours, we could not expect to achieve all the objectives within the allotted period of work. However, the most relevant program objectives have been completed as reported here. The analysis generally confirms the results originally estimated in my paper on the subject. (Ref. 2) Further optimizations should show even higher efficiencies. The Anderson Quin Cycle (US Patent applied for) basically consists of 5 elements in the power cycle: A refrigeration system to cool and clean the inlet air before it enters the compressor that supplies air for the gas turbine; a gas turbine consisting of a compressor, combustor, and turbine; a steam boiler and steam turbine system using the heat from the exhaust gas out of the gas turbine; a vapor turbine cycle, which utilizes the condensed heat from the exhaust of the steam turbine and the exhaust gas heat leaving the steam boiler to operate a vapor turbine cycle which utilizes another fluid than water, in this case isobutane; and the fifth element consists of a gas cooler and heat pump system, which removes the heat from the exhaust gas to lower its temperature essentially to atmospheric temperature, and at the same time permits treatment of the exhaust gas to remove acid components such as sulfur dioxide and nitrogen oxides. Current industry accepted component characteristics were incorporated in the performance analysis of the overall cycle, ensuring accurate and meaningful operating predictions. The characteristics and performance of each of the elements are described. The thermal efficiency of the optimized calculated Anderson Quin Cycle is 62 percent.

Anderson, J.H.; Bilbow, W.M.

1993-03-18

187

Chiral Condensate and Mott-Anderson Freeze-Out  

NASA Astrophysics Data System (ADS)

We present the idea of a Mott-Anderson freeze-out that suggests a key role of the localization of the hadron wave functions when traversing the hadronization transition. The extension of hadron wave functions in dense matter is governed by the behavior of the chiral quark condensate such that its melting at finite temperatures and chemical potentials entails an increase of the size of hadrons and thus their geometrical strong interaction cross sections. It is demonstrated within a schematic resonance gas model, that a kinetic freeze-out condition reveals a correlation with the reduction of the chiral condensate in the phase diagram up to 50% of its vacuum value. Generalizing the description of the chiral condensate by taking into account a full hadron resonance gas such correlation gets distorted. We discuss, that this may be due to our approximations in calculating the chiral condensate which disregard both, in-medium effects on hadron masses and hadron-hadron interactions. The latter, in particular due to quark exchange reactions, could lead to a delocalization of the hadron wave functions in accordance with the picture of a Mott-Anderson transition.

Blaschke, D.; Berdermann, J.; Cleymans, J.; Redlich, K.

2012-07-01

188

Are the phases in the Anderson model long-range correlated?  

Microsoft Academic Search

We investigate the local cumulative phases at single sites of the lattice for time-dependent wave functions in the Anderson model in d=2 and 3. In addition to a local linear trend, the phases exhibit some fluctuations. We study the time correlations of these fluctuations using detrended fluctuation analysis. Our results suggest that the phase fluctuations are long-range correlated, decaying as

Jan W. Kantelhardt; Richard Berkovits; Shlomo Havlin; Armin Bunde

1999-01-01

189

Critical behaviour in the QCD Anderson transition  

E-print Network

We study the Anderson-type localisation-delocalisation transition found previously in the QCD Dirac spectrum at high temperature. Using high statistics QCD simulations with $N_f=2+1$ flavours of staggered quarks, we discuss how the change in the spectral statistics depends on the volume, the temperature and the lattice spacing, and we speculate on the possible universality of the transition from Poisson to Wigner-Dyson in the spectral statistics. Moreover, we show that the transition is a genuine phase transition: at the mobility edge, separating localised and delocalised modes, quantities characterising the spectral statistics become non-analytic in the thermodynamic limit. Using finite size scaling we also determine the critical exponent of the correlation length, and we speculate on possible extensions of the universality of Anderson transitions.

Matteo Giordano; Tamas G. Kovacs; Ferenc Pittler

2013-12-06

190

Universality and the QCD Anderson Transition  

E-print Network

We study the Anderson-type transition previously found in the spectrum of the QCD quark Dirac operator in the high temperature, quark-gluon plasma phase. Using finite size scaling for the unfolded level spacing distribution, we show that in the thermodynamic limit there is a genuine mobility edge, where the spectral statistics changes from Poisson to Wigner-Dyson statistics in a non-analytic way. We determine the correlation length critical exponent, $\

Matteo Giordano; Tamas G. Kovacs; Ferenc Pittler

2013-12-04

191

The effect of thermal motion on the electron localization in metal-to-ligand charge transfer excitations in [Fe(bpy)3](2+).  

PubMed

Accurate electronic structure calculations of the lowest excited states have been performed on twenty snapshots of a molecular dynamics simulation of [Fe(bpy)3](2+) dissolved in water. The thermal motion distorts the structure of the complex from its average D3 symmetry, causing the localization on one bipyridine ligand of the excited electron in the metal-to-ligand charge transfer (MLCT) state. The excitation energy is about 0.25 eV lower than that for the delocalized description of the MLCT state and is in good agreement with experiments. The composition of the MLCT band is carefully analyzed and the effect of thermal motion on the mechanism of light-induced spin crossover is discussed. PMID:25360630

Domingo, Alex; Sousa, Carmen; de Graaf, Coen

2014-11-12

192

Localization of Classical Waves II: Electromagnetic Waves.  

E-print Network

Localization of Classical Waves II: Electromagnetic Waves. Alexander Figotin \\Lambda Department We consider electromagnetic waves in a medium described by a position dependent dielectric constant at all times. Localization of electromagnetic waves is a consequence of Anderson localization

193

Classification and symmetry properties of scaling dimensions at Anderson transitions  

NASA Astrophysics Data System (ADS)

We develop a classification of composite operators without gradients at Anderson-transition critical points in disordered systems. These operators represent correlation functions of the local density of states (or of wave-function amplitudes). Our classification is motivated by the Iwasawa decomposition for the field of the pertinent supersymmetric ? model: The scaling operators are represented by “plane waves” in terms of the corresponding radial coordinates. We also present an alternative construction of scaling operators by using the notion of highest-weight vector. We further argue that a certain Weyl-group invariance associated with the ?-model manifold leads to numerous exact symmetry relations between the scaling dimensions of the composite operators. These symmetry relations generalize those derived earlier for the multifractal spectrum of the leading operators.

Gruzberg, I. A.; Mirlin, A. D.; Zirnbauer, M. R.

2013-03-01

194

The atomic approach to the Anderson model for the finite U case: application to a quantum dot  

NASA Astrophysics Data System (ADS)

In the present work we apply the atomic approach to the single-impurity Anderson model (SIAM). A general formulation of this approach, that can be applied both to the impurity and to the lattice Anderson Hamiltonian, was developed in a previous work (Foglio et al 2009 arxiv: 0903.0139v2 [cond-mat.str-el]). The method starts from the cumulant expansion of the periodic Anderson model, employing the hybridization as a perturbation. The atomic Anderson limit is analytically solved and its sixteen eigenenergies and eigenstates are obtained. This atomic Anderson solution, which we call the AAS, has all the fundamental excitations that generate the Kondo effect, and in the atomic approach is employed as a 'seed' to generate the approximate solutions for finite U. The width of the conduction band is reduced to zero in the AAS, and we choose its position such that the Friedel sum rule is satisfied, close to the chemical potential ?. We perform a complete study of the density of states of the SIAM over the whole relevant range of parameters: the empty dot, intermediate valence, Kondo and magnetic regimes. In the Kondo regime we obtain a density of states that characterizes well the structure of the Kondo peak. To show the usefulness of the method we have calculated the conductance of a quantum dot, side-coupled to a conduction band.

Lobo, T.; Figueira, M. S.; Foglio, M. E.

2010-07-01

195

Quantum localization without disorder in interacting Bose-Einstein condensates  

E-print Network

We discuss the possibility of exponential quantum localization in systems of ultracold bosonic atoms with repulsive interactions in open optical lattices without disorder. We show that exponential localization occur in the maximally excited state of the lowest energy band. We establish the conditions under which the presence of the upper energy bands can be neglected, determine the successive stages and the quantum phase boundaries at which localization occurs, and discuss how to detect it experimentally by visibility measurements. The discussed mechanism is a bona fide type of quantum localization, solely due to the interplay between nonlinearity and a bounded energy spectrum. In particular, it does not require the presence of random disorder or other local sources of noise, in striking contrast with Anderson localization.

Franzosi, Roberto; Illuminati, Fabrizio

2010-01-01

196

Localization and critical diffusion of quantum dipoles in two dimensions.  

PubMed

We discuss quantum propagation of dipole excitations in two dimensions. This problem differs from the conventional Anderson localization due to the existence of long-range hops. We find that the critical wave functions of the dipoles always exist which manifest themselves by a scale independent diffusion constant. If the system is T invariant the states are critical for all values of the parameters. Otherwise, there can be a "metal-insulator" transition between this "ordinary" diffusion and the Levy flights (the diffusion constant logarithmically increasing with the scale). These results follow from the two-loop analysis of the modified nonlinear supermatrix ? model. PMID:21902407

Aleiner, I L; Altshuler, B L; Efetov, K B

2011-08-12

197

MD Anderson-led study finds LIFR protein suppresses breast cancer metastasis  

Cancer.gov

A receptor protein suppresses local invasion and metastasis of breast cancer cells, the most lethal aspect of the disease, according to a research team headed by scientists from The University of Texas MD Anderson Cancer Center. Reporting in Nature Medicine, the team described using high-throughput RNA sequencing to identify the leukemia inhibitory factor receptor (LIFR) as a novel suppressor of breast cancer metastasis, the spread of the disease to other organs.

198

Non-localized ligand-to-metal charge transfer excited states in (Cp)2Ti(IV)(NCS)2.  

PubMed

The bent d(0) titanium metallocene (Cp)(2)Ti(NCS)(2) exhibits an intense phosphorescence from a ligand-to-metal charge transfer triplet excited state at 77 K in an organic glass substrate and a poly(methyl methacrylate) plastic substrate. Quantum chemical calculations and spectroscopic studies show that the orbital parentage of this triplet state arises from the promotion of an electron from an essentially nonbonding symmetry adapted pi molecular orbital located on the NCS(-) ligands to a d(z)2-(y)2 orbital located on the Ti metal. Standard infrared spectroscopy of (Cp)(2)Ti(NCS)(2) in its ground electronic state at 77 K reveals a pair of closely spaced absorptions at (2072 cm(-1), 2038 cm(-1))(glass) and (2055 cm(-1), 2015 cm(-1))(plastic) that are assigned, respectively, to the symmetric and antisymmetric CN stretching modes of the two coordinated NCS(-) ligands. Low-temperature (77 K) time-resolved infrared spectroscopy that accesses the phosphorescing triplet excited state on the ns time scale shows an IR bleach that is coincident with the two ground state CN stretching bands and an associated grow-in of a pair of new IR bands at slightly lower energies (2059 cm(-1), 2013 cm(-1))(glass) and (2049 cm(-1), 1996 cm(-1))(plastic) that are assigned, respectively, to the symmetric and antisymmetric CN stretches in the emitting triplet state. These transient IR bands decay with virtually identical lifetimes to those observed for the phosphorescence decays when measured under identical experimental conditions. Singular value decomposition analysis of the time-resolved infrared data shows that the observed transient IR features arise from the same electronic manifold as measured through luminescence studies. The close similarity between the ground state and excited-state CN stretching bands in (Cp)(2)Ti(NCS)(2) indicates that symmetry breaking does not occur in forming the charge-transfer triplet excited-state manifold; i.e., electron density is withdrawn from a delocalized pi MO spread across both NCS(-) ligands. Calculations at several levels of theory reveal a delocalized ligand-to-metal charge transfer excited triplet manifold. These calculations closely reproduce the relative intensity ratios and frequencies of the symmetric and antisymmetric transient infrared vibrations in the CN region. This study is the first time-resolved infrared investigation of a ligand-to-metal charge-transfer excited state and the first to be performed at cryogenic temperatures in thin-film organic glass and plastic substrates. PMID:12720460

Patrick, Elizabeth L; Ray, Chad J; Meyer, Grant D; Ortiz, Theodore P; Marshall, Jason A; Brozik, James A; Summers, Melissa A; Kenney, John W

2003-05-01

199

Paul J. Anderson Kodiak Laboratory. Alaska Fisheries Science Center  

E-print Network

Paul J. Anderson Kodiak Laboratory. Alaska Fisheries Science Center National Marine Fisheries of one of the world's major shrimp fisheries in the 1970s (Anderson and Gaffney 1977). A significant (ADF&G) has collected species and size-composition data from commercial landings since the beginning

200

14. 1903 View south along Anderson Street, Bracken Hotel shows ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

14. 1903 View south along Anderson Street, Bracken Hotel shows at far end of left-hand block. (Note: Despite reversed wording on print, this is printed correctly.) - John M. Bracken Hotel, 100-104 Anderson Street, Pittsburgh, Allegheny County, PA

201

The Economics of Censorship Resistance George Danezis and Ross Anderson  

E-print Network

The Economics of Censorship Resistance George Danezis and Ross Anderson University of Cambridge.Anderson)@cl.cam.ac.uk Abstract. We propose the first economic model of censorship resis- tance. Early peer-to-peer systems Internet. An alternative approach is to encourage nodes to serve re- sources they are interested in. Both

Danezis, George

202

Critical exponent for the Anderson transition in the three-dimensional orthogonal universality class  

NASA Astrophysics Data System (ADS)

We report a careful finite size scaling study of the metal-insulator transition in Anderson's model of localization. We focus on the estimation of the critical exponent ? that describes the divergence of the localization length. We verify the universality of this critical exponent for three different distributions of the random potential: box, normal and Cauchy. Our results for the critical exponent are consistent with the measured values obtained in experiments on the dynamical localization transition in the quantum kicked rotor realized in a cold atomic gas.

Slevin, Keith; Ohtsuki, Tomi

2014-01-01

203

Anderson transition on the Cayley tree as a traveling wave critical point for various probability distributions  

NASA Astrophysics Data System (ADS)

For Anderson localization on the Cayley tree, we study the statistics of various observables as a function of the disorder strength W and the number N of generations. We first consider the Landauer transmission TN. In the localized phase, its logarithm follows the traveling wave form \\ln T_N \\simeq \\overline{\\ln T_N} + \\ln t^* where (i) the disorder-averaged value moves linearly \\overline{\\ln (T_N)} \\simeq - \\frac{N}{\\xi_loc} and the localization length diverges as \\xi_loc \\sim (W-W_c)^{-\

Monthus, Cécile; Garel, Thomas

2009-02-01

204

Magnetic field induced quantum phase transitions in the two-impurity Anderson model  

SciTech Connect

In the two-impurity Anderson model, the inter-impurity spin exchange interaction favors a spin singlet state between two impurities leading to the localization of quasiparticles. We show that a local uniform magnetic field can delocalize the quasiparticies to restore the Kondo resonance. This transition is found to be continuous, accompanied by not only the divergence of the staggered (anti ferromagnetic) susceptibility, but also the divergence of the uniform spin susceptibility. This implies that the magnetic field induced quantum phase transitions in Kondo systems are in favor of the local critical type.

Zhu, Lujun [Los Alamos National Laboratory; Zhu, Jian - Xin [Los Alamos National Laboratory

2010-11-17

205

Anderson localization for the almost Mathieu equation: A nonperturbative proof  

Microsoft Academic Search

We prove that for any diophantine rotation angle ? and a.e. phase ? the almost Mathieu operator (H(?)?)n=?n?1+?n+1 +?cos(2?(?+n?))?n has pure point spectrum with exponentially decaying eigenfunctions for ??15. We also prove the existence of some pure point spectrum for any ??5.4.

Svetlana Ya. Jitomirskaya

1994-01-01

206

Anderson Localization for Random Schrodinger Operators with Long Range Interactions  

E-print Network

ZERO-THRESHOLD RESOLVENT ASYMPTOTICS OF THREE-BODY SCHR�ODINGER OPERATORS XUE PING WANG Abstract. We analyze the spectral properties for three-body Schr�odinger op- erators at the threshold zero. Efimov in 1970 ([5]) de- scribes an interesting and unexpected phenomenon for three-body Schr�odinger

Stollmann, P.

207

The Anderson Reservoir seismic gap - Induced aseismicity?  

USGS Publications Warehouse

A persistent 10-km seismicity gap along the Calaveras fault appears to be related to the presence of the Leroy Anderson Reservoir in the Calaveras-Silver Creek fault zones southeast of San Jose, California. A magnitude-4.7 earthquake occurred at a depth of 5 km in the centre of the gap on October 3, 1973. The sequence of immediate aftershocks usually accompanying shallow earthquakes of this magnitude in central California did not occur. A bridge crossing the reservoir near its southeast end has been severely deformed, apparently the result of tectonic creep on the Calaveras fault. The occurrence of creep and absence of small earthquakes along the Calaveras in the vicinity of the reservoir suggest a transition from stick slip to stable sliding, possibly brought about by increased pore pressure. ?? 1976.

Bufe, C. G.

1976-01-01

208

Efficient evaluation of dielectric response functions and calculations of ground and excited state properties beyond local Density Functional approaches  

NASA Astrophysics Data System (ADS)

A recently developed technique to diagonalize iteratively dielectric matrices [1], is used to carry out efficient, ab-initio calculations of dispersion interactions, and excited state properties of nanostructures. In particular, we present results for the binding energies of weakly bonded molecular crystals [2], obtained at the EXX/RPA level of theory, and for absorption spectra of semiconducting clusters, obtained by an iterative solution of the Bethe-Salpeter equations [3]. We show that the ability to obtain the eigenmodes of dielectric matrices from Density Functional perturbation theory, without computing single particle excited states, greatly improves the efficiency of both EXX/RPA and many body perturbation theory [3,4] calculations and opens the way to large scale computations. [1] H. Wilson, F. Gygi and G. Galli, Phys. Rev. B , 78, 113303, 2008; and H. Wilson, D. Lu, F. Gygi and G. Galli, Phys. Rev. B, 79, 245106, 2009. [2] D. Lu, Y. Li, D. Rocca and G. Galli, Phys. Rev. Lett, 102, 206411, 2009; and Y. Li, D. Lu, V. Nguyen and G. Galli, J. Phys. Chem. C (submitted) [3] D. Rocca, D. Lu and G. Galli, submitted. [4] D. Lu, F. Gygi and G. Galli, Phys. Rev. Lett. 100, 147601, 2008. Work was funded by DOE/Scidac DE-FC02-06ER25794 and DOE/BES DE-FG02-06ER46262.

Lu, Deyu; Li, Yan; Rocca, Dario; Viet Nguyen, H.; Gygi, Francois; Galli, Giulia

2010-03-01

209

A topological approximation of the nonlinear Anderson model  

E-print Network

We study the phenomena of Anderson localization in the presence of nonlinear interaction on a lattice. A class of nonlinear Schrodinger models with arbitrary power nonlinearity is analyzed. We conceive the various regimes of behavior, depending on the topology of resonance-overlap in phase space, ranging from a fully developed chaos involving Levy flights to pseudochaotic dynamics at the onset of delocalization. It is demonstrated that quadratic nonlinearity plays a dynamically very distinguished role in that it is the only type of power nonlinearity permitting an abrupt localization-delocalization transition with unlimited spreading already at the delocalization border. We describe this localization-delocalization transition as a percolation transition on a Cayley tree. It is found in vicinity of the criticality that the spreading of the wave field is subdiffusive in the limit t\\rightarrow+\\infty. The second moment grows with time as a powerlaw t^\\alpha, with \\alpha = 1/3. Also we find for superquadratic nonlinearity that the analog pseudochaotic regime at the edge of chaos is self-controlling in that it has feedback on the topology of the structure on which the transport processes concentrate. Then the system automatically (without tuning of parameters) develops its percolation point. We classify this type of behavior in terms of self-organized criticality dynamics in Hilbert space. For subquadratic nonlinearities, the behavior is shown to be sensitive to details of definition of the nonlinear term. A transport model is proposed based on modified nonlinearity, using the idea of stripes propagating the wave process to large distances. Theoretical investigations, presented here, are the basis for consistency analysis of the different localization-delocalization patterns in systems with many coupled degrees of freedom in association with the asymptotic properties of the transport.

Alexander V. Milovanov; Alexander Iomin

2014-06-03

210

Critical State of the Anderson Transition: Between a Metal and an Insulator  

SciTech Connect

Using a three-frequency one-dimensional kicked rotor experimentally realized with a cold atomic gas, we study the transport properties at the critical point of the metal-insulator Anderson transition. We accurately measure the time evolution of an initially localized wave packet and show that it displays at the critical point a scaling invariance characteristic of this second-order phase transition. The shape of the momentum distribution at the critical point is found to be in excellent agreement with the analytical form deduced from the self-consistent theory of localization.

Lemarie, Gabriel; Delande, Dominique [Laboratoire Kastler Brossel, UPMC-Paris 6, ENS, CNRS, 4 Place Jussieu, F-75005 Paris (France); Lignier, Hans; Szriftgiser, Pascal; Garreau, Jean Claude [Laboratoire de Physique des Lasers, Atomes et Molecules, Universite Lille 1 Sciences et Technologies, UMR CNRS 8523, F-59655 Villeneuve d'Ascq Cedex (France)

2010-08-27

211

Segregating Planners and Their Environments Scott D. Anderson  

E-print Network

Segregating Planners and Their Environments Scott D. Anderson Paul R. Cohen Experimental Knowledge strive towards, is illustrated in g- ure 1(b), where both the planner and agent inter- face to a domain

Southern California, University of

212

MD Anderson study finds cancer related pain often undertreated  

Cancer.gov

More than one third of patients with invasive cancer are undertreated for their pain, with minorities twice as likely to not receive analgesics, according to research from The University of Texas MD Anderson Cancer Center.

213

Topology, Delocalization via Average Symmetry and the Symplectic Anderson Transition  

E-print Network

A field theory of the Anderson transition in two-dimensional disordered systems with spin-orbit interactions and time-reversal symmetry is developed, in which the proliferation of vortexlike topological defects is essential ...

Fu, Liang

214

Anderson-Fabry disease in children.  

PubMed

Although clinical evidence of major organ damage is typical of adulthood, many of the signs and symptoms of Anderson Fabry Disease (AFD) occur frequently in childhood. The clinical phenotype of AFD in pediatric patients has been described in several studies which show a higher incidence and an earlier onset of symptoms in male patients than in females. These include neurological manifestations (acroparaesthesias, chronic neuropathic pain, hypo-anhidrosis, tinnitus, hearing, loss), gastrointestinal (GI) symptoms (abdominal pain and diarrhea), angiokeratomas, ocular abnormalities (cornea verticillata, tortuous retinal vessels and subcapsular cataracts). Such manifestations may impair quality of life and, because of their unspecific nature, rarely lead to an early diagnosis. In addition, signs of major organ damage (microalbuminuria or proteinuria, urinary hyperfiltration, impaired heart rate variability, left ventricular hypertrophy, stroke) are encountered in children with AFD. Clinical trials of enzyme replacement therapy (ERT) with agalsidase alfa and agalsidase beta have been conducted in children, with clinical and pharmacodinamc effects proved by both enzyme formulations, whereas differences in safety profile and administration were found. Although several studies suggest that ERT should be started before irreversible damage in critical organs have occurred, the issue of when to initiate it has not yet been resolved. More controlled trials must be done in order to demonstrate that an early start of ERT could prevent adult complications and to assess the optimal timing of treatment in children with AFD. This review aims to provide an update of the current understanding for a better approach of pediatric AFD. PMID:23448455

Sestito, Simona; Ceravolo, Ferdinando; Concolino, Daniela

2013-01-01

215

UNIFORM APPROXIMATION BY bHARMONIC FUNCTIONS JOHN T. ANDERSON  

E-print Network

32A26. 1 #12;2 JOHN T. ANDERSON As a function of z K, the integral over the complement of K in (1{ - gK : g R(K)} C/zK · m(K) with C = 2/ . In particular, (1.4) gives an easy proof of the HartogsUNIFORM APPROXIMATION BY b­HARMONIC FUNCTIONS JOHN T. ANDERSON Abstract. The Mergelyan and Ahlfors

Anderson, John T.

216

Forced magnetic reconnection in a plasma sheet with localized resistivity profile excited by lower hybrid drift type instability  

NASA Technical Reports Server (NTRS)

A forced magnetic reconnection process with a temporal evolution of resistivity is studied for a plasma sheet with a nonuniform resistivity profile based on the nonlocal mode structure of the lower hybrid drift type instability. The growth rate of the mode found is almost independent of the resistivity at the neutral sheet, but depends on the resistivity of the region of maximum density gradient away from the neutral sheet. This is studied by using both a nonlinear numerical MHD simulation and a linear theory. The mode may be relevant to the prevalent theoretical concept of MHD reconnection and the localized anomalous resistivity profile based on the lower hybrid drift instability.

Hoshino, M.

1991-01-01

217

Dystopian Visions of Global Capitalism: Philip Reeve’s Mortal Engines and M.T Anderson’s Feed  

Microsoft Academic Search

This article examines Philip Reeve’s novel for children, Mortal Engines, and M.T. Anderson’s young adult novel, Feed, by assessing these dystopias as prototypical texts of what Ulrich Beck calls risk society. Through their visions of a fictional\\u000a future, the two narratives explore the hazards created by contemporary techno-economic progress, predatory global politics\\u000a and capitalist excesses of consumption. They implicitly pose

Elizabeth Bullen; Elizabeth Parsons

2007-01-01

218

Detection of Influenza Virus with Specific Subtype by Using Localized Surface Plasmons Excited on a Flat Metal Surface  

NASA Astrophysics Data System (ADS)

We report on a method to determine subtype of influenza viruses by using surface plasmons localized in microscopic region on a flat metal surface. In this method, refractive index variation arisen from interactions between viruses and their monoclonal antibodies is measured. The developed sensor shows stability of refractive index in the order of 10-4 against sample exchange. In our experiment, A/H1N1 viruses are distinguished from A/H3N2 viruses by using monoclonal antibodies immobilized on the metal surface. Since the measurement probe has the volume of ?6 al, the method has potential to handle multiple subtypes in the measurement of a sample with ultra small volume.

Ning, Jun; Nagata, Kotaro; Ainai, Akira; Hasegawa, Hideki; Kano, Hiroshi

2013-08-01

219

Cryogenic exciter  

DOEpatents

The disclosed technology is a cryogenic static exciter. The cryogenic static exciter is connected to a synchronous electric machine that has a field winding. The synchronous electric machine is cooled via a refrigerator or cryogen like liquid nitrogen. The static exciter is in communication with the field winding and is operating at ambient temperature. The static exciter receives cooling from a refrigerator or cryogen source, which may also service the synchronous machine, to selected areas of the static exciter and the cooling selectively reduces the operating temperature of the selected areas of the static exciter.

Bray, James William (Niskayuna, NY); Garces, Luis Jose (Niskayuna, NY)

2012-03-13

220

Localization of brain-derived neurotrophic factor to distinct terminals of mossy fiber axons implies regulation of both excitation and feedforward inhibition of CA3 pyramidal cells.  

PubMed

Hippocampal dentate granule cells directly excite and indirectly inhibit CA3 pyramidal cells via distinct presynaptic terminal specializations of their mossy fiber axons. This mossy fiber pathway contains the highest concentration of brain-derived neurotrophic factor (BDNF) in the CNS, yet whether BDNF is positioned to regulate the excitatory and/or inhibitory pathways is unknown. To localize BDNF, confocal microscopy of green fluorescent protein transgenic mice was combined with BDNF immunohistochemistry. Approximately half of presynaptic granule cell-CA3 pyramidal cell contacts were found to contain BDNF. Moreover, enhanced neuronal activity virtually doubled the percentage of BDNF-immunoreactive terminals contacting CA3 pyramidal cells. To our surprise, BDNF was also found in mossy fiber terminals contacting inhibitory neurons. These studies demonstrate that mossy fiber BDNF is poised to regulate both direct excitatory and indirect feedforward inhibitory inputs to CA3 pyramdal cells and reveal that seizure activity increases the pool of BDNF-expressing granule cell presynaptic terminals contacting CA3 pyramidal cells. PMID:15601941

Danzer, Steve C; McNamara, James O

2004-12-15

221

Topology of delocalization in the nonlinear Anderson model and anomalous diffusion on finite clusters  

E-print Network

This study is concerned with destruction of Anderson localization by a nonlinearity of the power-law type. We suggest using a nonlinear Schr\\"odinger model with random potential on a lattice that quadratic nonlinearity plays a dynamically very distinguished role in that it is the only type of power nonlinearity permitting an abrupt localization-delocalization transition with unlimited spreading already at the delocalization border. For super-quadratic nonlinearity the borderline spreading corresponds to diffusion processes on finite clusters. We have proposed an analytical method to predict and explain such transport processes. Our method uses a topological approximation of the nonlinear Anderson model and, if the exponent of the power nonlinearity is either integer or half-integer, will yield the wanted value of the transport exponent via a triangulation procedure in an Euclidean mapping space. A kinetic picture of the transport arising from these investigations uses a fractional extension of the diffusion equation to fractional derivatives over the time, signifying non-Markovian dynamics with algebraically decaying time correlations.

A. V. Milovanov; A. Iomin

2014-05-29

222

REVIEW OF D-T RESULTS FROM TFTR K.M. McGuire, H. Adler, P. Alling, C. Ancher, H. Anderson, J.L. Anderson,1 J.W. Anderson,  

E-print Network

.L. Anderson,1 J.W. Anderson, V. Arunasalam, G. Ascione, D. Ashcroft, Cris.W. Barnes,1 G. Barnes, S. Batha,2 G. Parks,6 S.F. Paul, G. Pearson, E. Perry, R. Persing, M. Petrov,16 C.K. Phillips, M. Phillips,11 SREVIEW OF D-T RESULTS FROM TFTR K.M. McGuire, H. Adler, P. Alling, C. Ancher, H. Anderson, J

223

Preliminary Results from Pyroelectric Crystal Accelerator Tom Anderson1  

E-print Network

Preliminary Results from Pyroelectric Crystal Accelerator Tom Anderson1 , Ronald Edwards1 , Kevin and Nuclear Engineering at USMA are using pyroelectric crystals to ionize and accelerate residual gas trapped: Pyroelectric Crystal Accelerator, Educational Accelerator, Nuclear Fusion, Neutrons PACS: 24.90+d INTRODUCTION

Danon, Yaron

224

POLAR SEA ICE MAPPING FOR SEAWINDS Hyrum S. Anderson  

E-print Network

POLAR SEA ICE MAPPING FOR SEAWINDS by Hyrum S. Anderson A thesis submitted to the faculty, College of Engineering and Technology #12;viii #12;ABSTRACT POLAR SEA ICE MAPPING FOR SEAWINDS Hyrum S sea ice. Advances in microwave remote sensing technology have allowed a large-scale and detailed study

Long, David G.

225

Parabolic Anderson model with a finite number of moving catalysts  

E-print Network

Parabolic Anderson model with a finite number of moving catalysts F. Castell, O. G¨un and G- actant" u under the influence of a "catalyst" . In the present paper we focus on the case where of particles A and B. A-particles represent "catalysts", B-particles represent "reactants" and the dynamics

Maillard, Grégory

226

Partitions of trees and ACA0 Bernard A. Anderson  

E-print Network

Partitions of trees and ACA0 Bernard A. Anderson Jeffry L. Hirst Appalachian State University is equivalent to the subsystem ACA0 of reverse mathemat- ics. In [1], a version of Ramsey's theorem for trees of Ramsey's theorem are also equivalent. Because there are so few examples of proofs involving ACA0

Hirst, Jeff

227

Key Infection: Smart Trust for Smart Dust Ross Anderson  

E-print Network

Key Infection: Smart Trust for Smart Dust Ross Anderson University of Cambridge Ross sensor networks are becoming increasingly im- portant for a wide variety of applications such as factory technology is given by the `Smart Dust' project which is developing tiny sensors [9]. Its goal is to make

Perrig, Adrian

228

Atomic Semantics of Nonatomic James H. Anderson Mohamed G. Gouda  

E-print Network

Atomic Semantics of Nonatomic Programs James H. Anderson Mohamed G. Gouda Department of Computer that it is possible, and sometimes useful, to reason about nonatomic programs within the conventional atomic model concurrent programs are developed within the atomic model of concurrency Ho 72, LS 84, MP 84, OG 76

Anderson, James

229

A TWO CITIES THEOREM FOR THE PARABOLIC ANDERSON MODEL  

E-print Network

¨orters Nadia Sidorova Abstract: The parabolic Anderson problem is the Cauchy problem for the heat equation tu the heat equation with random potential on the integer lattice Zd and study the Cauchy problem number of spatially separated regions of small diameter, which are often called the relevant islands

230

Anderson Productions Cruisin' Oklahoma US 66 video archive Transcripts  

E-print Network

. Paye, Randy Weaver, 2 maps, Unity race, Miami bridge. · Phillips Petroleum Company video services. #12Anderson Productions ­ Cruisin' Oklahoma US 66 video archive Transcripts Handwritten note reads: 1 are Hi8 video, ¾", or BetaSP. 1 TC 000000 ­ 00:31:00 from Hi8 #1. See ¾" #A. 2 TC 00:31:21:15 ­ 1

Veiga, Pedro Manuel Barbosa

231

Exploring the retinal connectome James R. Anderson,1  

E-print Network

Exploring the retinal connectome James R. Anderson,1 Bryan W. Jones,1 Carl B. Watt,1 Margaret V. Shaw,1 Jia-Hui Yang,1 David DeMill,1 James S. Lauritzen,1 Yanhua Lin,1 Kevin D. Rapp,1 David distinct signaling modes, including ribbon synapse inputs from OFF bipolar cells, wide-field ON cone

Utah, University of

232

Introduction to Genetic Algorithms Peter G. Anderson, Computer Science Department  

E-print Network

#12;1 Introduction to Genetic Algorithms Peter G. Anderson, Computer Science Department Rochester, selective breeding, "survival of the fittest." We will present the fundamental algorithms and present Computers To... Synchronize like the fireflies. Discover FSMs given the sentences. Control robots. 2000/05/0

Anderson, Peter G.

233

Measuring the Cost of Cybercrime Ross Anderson 1  

E-print Network

Measuring the Cost of Cybercrime Ross Anderson 1 Chris Barton 2 Rainer B¨ohme 3 Richard Clayton 4 what we believe to be the first systematic study of the costs of cybercrime. It was prepared the problem. For each of the main categories of cybercrime we set out what is and is not known of the direct

Savage, Stefan

234

What Do Consumers Believe About Future Gasoline Soren T. Anderson  

E-print Network

What Do Consumers Believe About Future Gasoline Prices? Soren T. Anderson Michigan State University November 3, 2010 PRELIMINARY DRAFT: PLEASE DO NOT CITE WITHOUT PERMISSION Abstract How do consumers form to this question is key to an ongoing debate regarding the "energy paradox" ­ which stipulates that consumers

Silver, Whendee

235

Plant and Animal Sciences Val J. Anderson, Chair  

E-print Network

Plant and Animal Sciences Val J. Anderson, Chair 275 WIDB, (801) 422-3527 College of Biology programs in the Department of Plant and Animal Sciences are open enrollment. The Discipline Disciplines in the Department of Plant and Animal Sciences focus on four of the great dilemmas facing mankind in the twenty

Hart, Gus

236

Poisson statistics of eigenvalues in the hierarchical Anderson model  

E-print Network

We study the eigenvalue statistics for the hieracharchial Anderson model of Molchanov. We prove Poisson fluctuations at arbitrary disorder, when the the model has spectral dimension d<1. The proof is based on Minami's technique and we give an elementary exposition of the probabilistic arguments.

Evgenij Kritchevski

2007-10-13

237

J and the Traveling Salesman Peter G. Anderson,  

E-print Network

mutate the new population. pg. 6 #12;Test Plan N randomly chosen cities. N � M cities in a grid (N · M of Technology, Rochester, New York anderson@cs.rit.edu http://www.cs.rit.edu/ June 11, 2003 pg. 1 #12;Abstract list and distance matrix. Run the GA with specified population size and number of generations. pg. 15

Anderson, Peter G.

238

UT MD Anderson scientists discover secret life of chromatin:  

Cancer.gov

Chromatin--the intertwined histone proteins and DNA that make up chromosomes--constantly receives messages that pour in from a cell’s intricate signaling networks... But chromatin also talks back, scientists at The University of Texas M.D. Anderson Cancer Center report today in the journal Cell, issuing orders affecting a protein that has nothing to do with chromatin’s central role in gene transcription--the first step in protein formation.

239

A struggle for freedom; Maxwell Anderson, 1938-1952  

E-print Network

, dirty marines who relate their battle experiences and the continuous parade of wounded soldiers across the stage, all combined effectively to bring out "the misery and bitterness and havoc of war. " This realistic portrayal of battle zone life... performances. Perhaps the play, with its emphasis on individual faith and ideals, was completely out of touch with the sentiments of the American people. The failure of the production had a sobering effect on Anderson. Financially, he was in desperate...

Odeski, Thomas Francis

2012-06-07

240

Solar hot water system installed at Anderson, South Carolina  

NASA Technical Reports Server (NTRS)

A description is given of the solar energy hot water system installed in the Days Inns of America, Inc., at Anderson, South Carolina. The building is a low-rise, two-story 114-room motel. The solar system was designed to provide 40 percent of the total hot water demand. The collector is a flat plate, liquid with an area of 750 square feet. Operation of this system was begun in November 1977, and has performed flawlessly for one year.

1978-01-01

241

A density functional that works for transport through Anderson junction  

NASA Astrophysics Data System (ADS)

Transport through an Anderson junction can be exactly described by density functional theory, at zero temperature and in the linear response regime. Using Bethe ansatz, we calculate the exact Kohn-Sham potential delivering the exact transmission. We propose a simple parametrization for the Kohn-Sham potential, using a known exact condition. Our parametrization faithfully reproduces numerical results, including the gradual development of the derivative discontinuity that is essential in describing Coulomb blockade correctly.

Liu, Zhenfei; Bergfield, Justin; Burke, Kieron; Stafford, Charles

2012-02-01

242

Accuracy of density functionals for molecular electronics: The Anderson junction  

NASA Astrophysics Data System (ADS)

The exact ground-state exchange-correlation functional of Kohn-Sham density functional theory yields the exact transmission through an Anderson junction at zero bias and temperature. The exact impurity charge susceptibility is used to construct the exact exchange-correlation potential. We analyze the successes and limitations of various types of approximations, including smooth and discontinuous functionals of the occupation, as well as symmetry-broken approaches.

Liu, Zhen-Fei; Bergfield, Justin P.; Burke, Kieron; Stafford, Charles A.

2012-04-01

243

STS-107 Payload Commander Michael Anderson suits up for TCDT  

NASA Technical Reports Server (NTRS)

KENNEDY SPACE CENTER, FLA. -- STS-107 Payload Commander Michael Anderson completes suit check prior to Terminal Countdown Demonstration Test activities, which include a simulated launch countdown at the pad. STS-107 is a mission devoted to research and will include more than 80 experiments that will study Earth and space science, advanced technology development, and astronaut health and safety. Launch is planned for Jan. 16, 2003, between 10 a.m. and 2 p.m. EST aboard Space Shuttle Columbia. .

2002-01-01

244

Moments and Lyapunov exponents for the parabolic Anderson model  

E-print Network

We study the parabolic Anderson model in $(1+1)$ dimensions with nearest neighbor jumps and space-time white noise (discrete space/continuous time). We prove a contour integral formula for the second moment and compute the second moment Lyapunov exponent. For the model with only jumps to the right, we prove a contour integral formula for all moments and compute moment Lyapunov exponents of all orders.

Alexei Borodin; Ivan Corwin

2012-11-30

245

MD Anderson researchers find coupling of proteins promotes glioblastoma development:  

Cancer.gov

Two previously unassociated proteins known to be overly active in a variety of cancers bind together to ignite and sustain malignant brain tumors, a research team led by scientists at The University of Texas MD Anderson Cancer Center reports this week in the journal Cancer Cell. This research is the first to connect FoxM1 to a molecular signaling cascade that regulates normal neural stem cells...

246

Quantum resonances in selective rotational excitation of molecules with a sequence of ultrashort laser pulses  

NASA Astrophysics Data System (ADS)

The periodically kicked rotor is a paradigm system for studying classical and quantum chaos. In the quantum regime, the dynamics of the kicked rotor exhibit such phenomena as suppression of classical chaos, Anderson localization in angular momentum and quantum resonances in the accumulation of rotational energy. Even though these effects have been studied with ultracold atoms in optical fields and Rydberg atoms in microwave fields, they have never been observed in a real rotational system. In this work we study the effect of quantum resonance in the rotational excitation of a diatomic molecule. By using femtosecond pulse shaping and rotational state-resolved detection, we measure the rotational distribution of molecules interacting with a train of pulses. We show enhancement of population transfer from the ground to the excited rotational states at resonance, and demonstrate selective rotational excitation of two nitrogen isotopes. We utilize fractional quantum resonances for separating para- and ortho-nitrogen, paving the way to novel methods of coherent control of molecular rotation.

Zhdanovich, Sergey; Bloomquist, Casey; Floss, Johannes; Averbukh, Ilya; Hepburn, John; Milner, Valery

2012-06-01

247

Quantum resonances in selective rotational excitation of molecules with a sequence of ultrashort laser pulses  

NASA Astrophysics Data System (ADS)

The periodically kicked rotor is a paradigm system for studying classical and quantum chaos. In the quantum regime, the dynamics of the kicked rotor exhibit such phenomena as suppression of classical chaos, Anderson localization in angular momentum and quantum resonances in the accumulation of rotational energy. Even though these effects have been studied with ultracold atoms in optical fields and Rydberg atoms in microwave fields, they have never been observed in a real rotational system. In this work we study the effect of quantum resonance in the rotational excitation of a diatomic molecule. By using femtosecond pulse shaping and rotational state-resolved detection, we measure the rotational distribution of molecules interacting with a train of pulses. We show enhancement of population transfer from the ground to the excited rotational states at resonance, and demonstrate selective rotational excitation of two nitrogen isotopes. We utilize fractional quantum resonances for separating para- and ortho-nitrogen, paving the way to novel methods of coherent control of molecular rotation.

Zhdanovich, Sergey; Bloomquist, Casey; Floss, Johannes; Averbukh, Ilya; Hepburn, John; Milner, Valery

2012-10-01

248

Interorbital interaction in the one-dimensional periodic Anderson model: Density matrix renormalization group study  

NASA Astrophysics Data System (ADS)

We investigate the effect of the Coulomb interaction, Ucf, between the conduction and f electrons in the periodic Anderson model using the density matrix renormalization group algorithm. We calculate the excitation spectrum of the half-filled symmetric model with an emphasis on the spin and charge excitations. In the one-dimensional version of the model, it is found that the spin gap is smaller than the charge gap below a certain value of Ucf and the reversed inequality is valid for stronger Ucf. This behavior is also verified by the behavior of the spin and density correlation functions. We also perform a quantum information analysis of the model and determine the entanglement map of the f and conduction electrons. It is revealed that for a certain Ucf the ground state is dominated by the configuration in which the conduction and f electrons are strongly entangled, and the ground state is almost a product state. For larger Ucf, the sites are occupied alternatingly dominantly by two f electrons or by two conduction electrons.

Hagymási, I.; Sólyom, J.; Legeza, Ö.

2014-09-01

249

Topological Anderson insulator induced by inter-cell hopping disorder  

SciTech Connect

We have studied in detail the influence of same-orbit and different-orbit hopping disorders in HgTe/CdTe quantum wells. Intriguingly, similar to the behavior of the on-site Anderson disorder, a phase transition from a topologically trivial phase to a topological phase is induced at a proper strength of the same-orbit hopping disorder. For different-orbit hopping disorder, however, the phase transition does not occur. The results have been analytically verified by using effective medium theory. A consistent conclusion can be obtained by comparing phase diagrams, conductance, and conductance fluctuations. In addition, the influence of Rashba spin-orbit interaction (RSOI) on the system has been studied for different types of disorder, and the RSOI shows different influence on topological phase at different disorders. The topological phase induced by same-orbit hopping disorder is more robust against the RSOI than that induced by on-site Anderson disorder. For different-orbit hopping disorder, no matter whether the RSOI is included or not, the phase transition does not occur. The results indicate, whether or not the topological Anderson insulator can be observed depends on a competition between the different types of the disorder as well as the strength of the RSOI in a system.

Lv, Shu-Hui [Hebei Advanced Thin Film Laboratory, College of Physics, Hebei Normal University, Hebei 050024 (China); College of Sciences, Hebei University of Science and Technology, Shijiazhuang 050018 (China); Song, Juntao, E-mail: jtsong@mail.hebtu.edu.cn; Li, Yu-Xian, E-mail: yxli@mail.hebtu.edu.cn [Hebei Advanced Thin Film Laboratory, College of Physics, Hebei Normal University, Hebei 050024 (China)

2013-11-14

250

Pu 4f XPS spectra analyzed in the Anderson impurity model  

SciTech Connect

X-ray photoemission spectra of the {alpha},{beta},{gamma}, and {delta} phases of Pu have been analyzed using the Gunnarsson-Schonhammer implementation of the Anderson impurity model. Changes in the relative intensities of the two spectral features representing mixed f{sup 5} and f{sup 6} final states are in reasonable agreement with the model`s predictions. The coulomb terms, U{sub ff} and U{sub fc}, are quite consistent with those derived from atomic and LDA calculations. Multiplet structure, which agrees with atomic calculations for 4f{sup 13}5f{sup 5}, strongly suggests 5f localization in the final state.

Cox, L.E.; Peek, J.M. [Los Alamos National Lab., NM (United States). Nuclear Materials Technology Div.; Allen, J.W. [Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics

1998-05-09

251

Foundations of Physics, Vol . 28, No. 4, 1998 Bands of Localized Electromagnetic Waves in  

E-print Network

methods and concepts of solid-state physics. Let us mention, e.g., the concept of electron localization in investigations of Anderson localization in solid-state physics is to study the transport equa- tion

Rusek, Marian

252

Attosecond Photoscopy of Plasmonic Excitations  

NASA Astrophysics Data System (ADS)

We propose an experimental arrangement to image, with attosecond resolution, transient surface plasmonic excitations. The required modifications to state-of-the-art setups used for attosecond streaking experiments from solid surfaces only involve available technology. Buildup and lifetimes of surface plasmon polaritons can be extracted and local modulations of the exciting optical pulse can be diagnosed in situ.

Lupetti, Mattia; Hengster, Julia; Uphues, Thorsten; Scrinzi, Armin

2014-09-01

253

Exciting Pools  

ERIC Educational Resources Information Center

Advocates the creation of swimming pool oscillations as part of a general investigation of mechanical oscillations. Presents the equations, procedure for deriving the slosh modes, and methods of period estimation for exciting swimming pool oscillations. (GS)

Wright, Bradford L.

1975-01-01

254

Fractal Superconductivity near Localization Threshold  

E-print Network

Fractal Superconductivity near Localization Threshold Mikhail Feigel'man Landau Institute, Moscow-electron states are extended but fractal and populate small fraction of the whole volume How BCS theory should be modified to account for eigenstates fractality ? #12;Mean-Field Eq. for Tc #12;#12;3D Anderson model: = 0

Fominov, Yakov

255

Kubo-Anderson oscillator and NMR of solid state.  

PubMed

The analytical solution for the Kubo-Anderson oscillator with a fluctuating frequency omega for arbitrary distribution function p(omega) has been obtained. The obtained theoretical expression has been applied to consideration of some dynamical problems of solid state NMR, namely (1) dynamical transformation of NMR line shape and spin-echo signal and (2) the temperature transformation of the second moment of NMR line for the case, when the potential barrier for the mobility of magnetic nuclei is a stochastic function of time. PMID:18783926

Sergeev, N A; Olszewski, M

2008-10-01

256

STS-118 Astronauts Rick Mastracchio and Clay Anderson Perform EVA  

NASA Technical Reports Server (NTRS)

As the construction continued on the International Space Station (ISS), STS-118 astronaut and mission specialist Rick Mastracchio was anchored on the foot restraint of the Canadarm2 as he participated in the third session of Extra Vehicular Activity (EVA) for the mission. Assisting Mastracchio was Expedition 15 flight engineer Clay Anderson (out of frame). During the 5 hour, 28 minute space walk, the two relocated the S-band Antenna Sub-Assembly from the Port 6 (P6) truss to the Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder.

2007-01-01

257

Systematics and the origin of species from the viewpoint of a botanist: edgar anderson prepares the 1941 jesup lectures with ernst mayr.  

PubMed

The correspondence between Edgar Anderson and Ernst Mayr leading into their 1941 Jesup Lectures on "Systematics and the Origin of Species" addressed population thinking, the nature of species, the relationship of microevolution to macroevolution, and the evolutionary dynamics of plants and animals, all central issues in what came to be known as the Evolutionary Synthesis. On some points, they found ready agreement; for others they forged only a short term consensus. They brought two different working styles to this project reflecting their different appreciations of what was possible at this point in evolutionary studies. For Mayr, it was a focused project with definitive short term conclusions imminent while Anderson viewed it as an episode in an ongoing historical process that, while exciting and suggestive, remained openended. Thus, Mayr and Anderson represent two distinct perspectives on the Evolutionary Synthesis in formation; by understanding both of their points of view, we can grasp more fully the state of evolutionary theory at this key moment. PMID:22684268

Kleinman, Kim

2013-01-01

258

Flexible Binary Space Partitioning for Robotic Rescue Jacky Baltes and John Anderson  

E-print Network

Flexible Binary Space Partitioning for Robotic Rescue Jacky Baltes and John Anderson Autonomous for flexible binary space partitioning designed to serve as a basis for path planning in uncertain dynamic do such an ap- proach (Baltes & Anderson, 2002). This experience has taught us that at absolute minimum

Baltes, Jacky

259

Situated Privacies: Do you know where your mother [trucker] is? Ken Anderson  

E-print Network

Corporation 2111 NE 25th Ave, MS:JF3-377 Hillsboro, OR 97124/USA ken.anderson@intel.com Paul Dourish DonaldSituated Privacies: Do you know where your mother [trucker] is? Ken Anderson Intel Research Intel into the information age. In contrast to others who have looked at privacy practices on a national scale (e.g., nation

Dourish,Paul

260

The MITLL/AFRL MT System Wade Shen, Brian Delaney, and Tim Anderson  

E-print Network

The MITLL/AFRL MT System Wade Shen, Brian Delaney, and Tim Anderson MIT Lincoln Laboratory 244. WrightPatterson AFB, OH 45433 Timothy.Anderson@wpafb.af.mil Abstract The MITLL/AFRL MT system for SpeechtoSpeech MT applications. This paper will discuss the architecture of the MITLL/AFRL MT

261

Award for Distinguished Scientific Early Career Contributions to Psychology: Adam K. Anderson  

ERIC Educational Resources Information Center

Adam K. Anderson, recipient of the Award for Distinguished Scientific Early Career Contributions to Psychology, is cited for his outstanding contribution to understanding the representation of emotion and its influence on cognition. By combining psychological and neuroscience techniques with rigorous and creative experimental designs, Anderson has…

American Psychologist, 2009

2009-01-01

262

Melinda's Closet: Trauma and the Queer Subtext of Laurie Halse Anderson's Speak  

Microsoft Academic Search

Speak, Laurie Halse Anderson’s Michael L. Printz Honor Book, can be read as a coming-out story. The novel tells the story of Melinda Sordino, who, during the summer before her freshman year in high school, is raped at a party by an older boy who goes to the same school Melinda will attend in the fall. After the attack, Melinda,

Don Latham

2007-01-01

263

Excited Insects  

E-print Network

but not killing them doesn't actually count as true celebration. Now, China. There's a country that knows how to make a bug feel good. Bugs have their very own holiday in the Chinese calendar. It's called the Feast of the Excited Insects and it falls on March 5th...

Hacker, Randi

2011-04-06

264

Is Dicroglossidae Anderson, 1871 (Amphibia, Anura) an available nomen?  

PubMed

Anderson (1871a: 38) mentioned the family nomen Dicroglossidae, without any comment, in a list of specimens of the collections of the Indian Museum of Calcutta (now the Zoological Survey of India). He referred to this family a single species, Xenophrys monticola, a nomen given by Günther (1864) to a species of Megophryidae from Darjeeling and Khasi Hills (India) which has a complex nomenclatural history (Dubois 1989, 1992; Deuti et al. submitted). Dubois (1987: 57), considering that the nomen Dicroglossidae had been based on the generic nomen Dicroglossus Günther, 1860, applied it to a family group taxon, the tribe Dicroglossini, for which he proposed a diagnosis. The genus Dicroglossus had been erected by Günther (1860), 11 years before Anderson's (1871a) paper, for the unique species Dicroglossus adolfi. Boulenger (1882: 17) stated that this specific nomen was a subjective junior synonym of Rana cyanophlyctis Schneider, 1799, and therefore Dicroglossus a subjective junior synonym of Rana Linnaeus, 1758 (Boulenger, 1882: 7). The synonymy of these two species nomina has been accepted as valid until now by all authors, and we here confirm it, having examined the symphoronts (syntypes) of Rana cyanophlyctis (ZMB 3198, adult female, SVL 50.0 mm; ZMB 3197, adult female, SVL 44.7 mm) and of Dicroglossus adolfi (BMNH 1947.2.4.60, adult female, SVL 38.6 mm; BMNH 1947.2.4.61, adult male, SVL 33.1 mm; BMNH 1947.2.25.46, adult male, SVL 39.0 mm). Dubois (1980: 158, 1981: 238) referred the species cyanophlyctis to the genus Euphlyctis Fitzinger, 1843, where is still stands nowadays (Frost et al. 2006; Joshy et al. 2009). The nomen Dicroglossini was subsequently upgraded to the rank subfamily, as Dicroglossinae (Dubois 1992: 309, 313; Roelants et al. 2004: 732), then to the rank family, as Dicroglossidae (Frost et al. 2006: 241). The taxon at stake is currently recognized as valid by most authors, as the family Dicroglossidae Anderson, 1871 (Roelants et al. 2007; Fei et al. 2010: 25; Blackburn & Wake 2011: 42; Pyron & Wiens 2011: 579; Fei et al. 2012: 436; Vitt & Caldwell 2014: 510).  PMID:25081801

Ohler, Annemarie; Dubois, Alain

2014-01-01

265

On Diversity of Configurations Generated by Excitable Cellular Automata with Dynamical Excitation Intervals  

NASA Astrophysics Data System (ADS)

Excitable cellular automata with dynamical excitation interval exhibit a wide range of space-time dynamics based on an interplay between propagating excitation patterns which modify excitability of the automaton cells. Such interactions leads to formation of standing domains of excitation, stationary waves and localized excitations. We analyzed morphological and generative diversities of the functions studied and characterized the functions with highest values of the diversities. Amongst other intriguing discoveries we found that upper boundary of excitation interval more significantly affects morphological diversity of configurations generated than lower boundary of the interval does and there is no match between functions which produce configurations of excitation with highest morphological diversity and configurations of interval boundaries with highest morphological diversity. Potential directions of future studies of excitable media with dynamically changing excitability may focus on relations of the automaton model with living excitable media, e.g. neural tissue and muscles, novel materials with memristive properties and networks of conductive polymers.

Adamatzky, Andrew

2012-12-01

266

Multiterminal Anderson impurity model in nonequilibrium: Analytical perturbative treatment  

NASA Astrophysics Data System (ADS)

We study the nonequilibrium spectral function of the single-impurity Anderson model connecting with multiterminal leads. The full dependence on frequency and bias voltage of the nonequilibrium self-energy and spectral function is obtained analytically up to the second-order perturbation regarding the interaction strength U. High- and low-bias voltage properties are analyzed for a generic multiterminal dot, showing a crossover from the Kondo resonance to the Coulomb peaks with increasing bias voltage. For a dot where the particle-hole symmetry is not present, we construct a current-preserving evaluation of the nonequilibrium spectral function for arbitrary bias voltage. It is shown that finite-bias voltage does not split the Kondo resonance in this order, and no specific structure due to multiple leads emerges. Overall bias dependence is quite similar to finite-temperature effect for a dot with or without the particle-hole symmetry.

Taniguchi, Nobuhiko

2014-09-01

267

Renormalized perturbation theory flow equations for the Anderson impurity model  

NASA Astrophysics Data System (ADS)

We apply the renormalized perturbation theory (RPT) to the symmetric Anderson impurity model. Within the RPT framework exact results for physical observables such as the spin and charge susceptibility can be obtained in terms of the renormalized values of the hybridization ? and Coulomb interaction U of the model. The main difficulty in the RPT approach usually lies in the calculation of the renormalized values themselves. In the present work we show how this can be accomplished by deriving differential flow equations describing the evolution of with ?. By exploiting the fact that can be determined analytically in the limit ? ? ? we solve the flow equations numerically to obtain estimates for the renormalized parameters in the range 0 < U/ ??< 3.5.

Pandis, Vassilis

2014-11-01

268

Excited Delirium  

PubMed Central

Excited (or agitated) delirium is characterized by agitation, aggression, acute distress and sudden death, often in the pre-hospital care setting. It is typically associated with the use of drugs that alter dopamine processing, hyperthermia, and, most notably, sometimes with death of the affected person in the custody of law enforcement. Subjects typically die from cardiopulmonary arrest, although the cause is debated. Unfortunately an adequate treatment plan has yet to be established, in part due to the fact that most patients die before hospital arrival. While there is still much to be discovered about the pathophysiology and treatment, it is hoped that this extensive review will provide both police and medical personnel with the information necessary to recognize and respond appropriately to excited delirium. PMID:21691475

Takeuchi, Asia; Ahern, Terence L.; Henderson, Sean O.

2011-01-01

269

Examinations of identity invariance in facial expression adaptation Melissa Ellamil, Joshua M. Susskind and Adam K. Anderson  

E-print Network

. Susskind and Adam K. Anderson Department of Psychology, University of Toronto Running head: Facial expression adaptation Address correspondence to: Adam K. Anderson Department of Psychology University of Toronto 100 St. George Street Toronto, ON MS5 3G3, Canada e-mail: anderson@psych.utoronto.ca Phone: (416

Toronto, University of

270

Excited baryons  

SciTech Connect

The status of the theory of the low-energy approach to hadron structure is reviewed briefly by surveying a few relevant models. A few examples of tests needed to sort out the predictions of different models pertaining to the quark-gluon structure of hadrons are discussed, and given the resulting physics objectives, a few experimental options for excited baryon research at CFBAF are suggested. (LEW)

Mukhopadhyay, N.C.

1986-01-01

271

Excited Delirium  

Microsoft Academic Search

Excited delirium accounts for 1% of our EDP (emotionally disturbed persons) cases and 99% of our headaches.” This comment,\\u000a made some years ago at a New York City conference of police chiefs captures the managerial and legal concerns of this entity.\\u000a Police managers are concerned because their officers are suddenly confronted with psychotic, violent persons, which sets into\\u000a motion an

Charles V. Wetli

272

Topology regulates the distribution pattern of excitations in excitable dynamics on graphs  

NASA Astrophysics Data System (ADS)

We study the average excitation density in a simple model of excitable dynamics on graphs and find that this density strongly depends on certain topological features of the graph, namely connectivity and degree correlations, but to a lesser extent on the degree distribution. Remarkably, the average excitation density is changed via the distribution pattern of excitations: An increase in connectivity induces a transition from globally to locally organized excitations and, as a result, leads to an increase in the excitation density. A similar transition can be induced by increasing the rate of spontaneous excitations while keeping the graph architecture constant.

Müller-Linow, Mark; Marr, Carsten; Hütt, Marc-Thorsten

2006-07-01

273

Adult versus Pediatric Neuroblastoma: The M.D. Anderson Cancer Center Experience  

PubMed Central

Background. Staging and treatment of adult neuroblastoma has yet to be formalized. We sought to determine the utility of the pediatric classification system in adults and determine the efficacy of different treatment modalities. Methods. Medical records of 118 adults (patients >17 years old) and 112 pediatric patients (ages 2–17), who were treated for neuroblastoma at M.D. Anderson Cancer Center from January 1994 to September 2012, were reviewed. International neuroblastoma risk group (INRG) variables were abstracted. The primary outcome of interest was actuarial progression-free survival. Results. Median age of pediatric patients was 5 years (range 3–16) and 47 years (range 18–82) for adult patients. There were no differences in PFS or OS between stage-matched risk categories between pediatric and adult patients (L1-P = 0.40, L2-P = 0.54, and M-P = 0.73). In the treatment of L1 disease, median PFS for adults treated with surgery and radiation was 11.1 months compared with single modality local treatment ± chemotherapy (6.4 and 5.1 months, resp.; P = 0.07). Median PFS in L2 adult patients was 5.2 months with local therapy and 4 months with the addition of chemotherapy (P = 0.23). Conclusions. Adult and pediatric patients with neuroblastoma achieve similar survival outcomes. INRG classification should be employed to stratify adult neuroblastoma patients and help select treatment. PMID:25024639

Conter, Henry J.; Ravi, Vinod; Ater, Joann L.; Araujo, Dejka M.

2014-01-01

274

Fabrication of core-shell structured nanoparticle layer substrate for excitation of localized surface plasmon resonance and its optical response for DNA in aqueous conditions  

Microsoft Academic Search

LSPR from nanostructured noble metals such as gold and silver offers great potential for biosensing applications. In this study, a core-shell structured nanoparticle layer substrate was fabricated and the localized surface plasmon resonance (LSPR) optical characteristics were investigated for DNA in aqueous conditions. Factors such as DNA length dependence, concentration dependence, and the monitoring of DNA aspects (ssDNA or dsDNA)

Tatsuro Endo; Daisuke Ikeda; Yukari Kawakami; Yasuko Yanagida; Takeshi Hatsuzawa

2010-01-01

275

Increased peripheral nerve excitability and local NaV1.8 mRNA up-regulation in painful neuropathy  

Microsoft Academic Search

BACKGROUND: Neuropathic pain caused by peripheral nerve injury is a chronic disorder that represents a significant clinical challenge because the pathological mechanisms have not been fully elucidated. Several studies have suggested the involvement of various sodium channels, including tetrodotoxin-resistant NaV1.8, in affected dorsal root ganglion (DRG) neurons. We have hypothesized that altered local expression of NaV1.8 in the peripheral axons

Devang Kashyap Thakor; Audrey Lin; Yoshizo Matsuka; Edward M Meyer; Supanigar Ruangsri; Ichiro Nishimura; Igor Spigelman

2009-01-01

276

Multi-Stepped Optogenetics: A Novel Strategy to Analyze Neural Network Formation and Animal Behaviors by Photo-Regulation of Local Gene Expression, Fluorescent Color and Neural Excitation  

NASA Astrophysics Data System (ADS)

The brain is one of the most complicated structures in nature. Zebrafish is a useful model to study development of vertebrate brain, because it is transparent at early embryonic stage and it develops rapidly outside of the body. We made a series of transgenic zebrafish expressing green-fluorescent protein related molecules, for example, Kaede and KikGR, whose green fluorescence can be irreversibly converted to red upon irradiation with ultra-violet (UV) or violet light, and Dronpa, whose green fluorescence is eliminated with strong blue light but can be reactivated upon irradiation with UV or violet-light. We have recently shown that infrared laser evoked gene operator (IR-LEGO) which causes a focused heat shock could locally induce these fluorescent proteins and the other genes. Neural cell migration and axonal pattern formation in living brain could be visualized by this technique. We also can express channel rhodopsine 2 (ChR2), a photoactivatable cation channel, or Natronomonas pharaonis halorhodopsin (NpHR), a photoactivatable chloride ion pump, locally in the nervous system by IR. Then, behaviors of these animals can be controlled by activating or silencing the local neurons by light. This novel strategy is useful in discovering neurons and circuits responsible for a wide variety of animal behaviors. We proposed to call this method ‘multi-stepped optogenetics’.

Hatta, Kohei; Nakajima, Yohei; Isoda, Erika; Itoh, Mariko; Yamamoto, Tamami

277

Finite-size scaling of entanglement entropy at the Anderson transition with interactions  

NASA Astrophysics Data System (ADS)

We study the Anderson transition with interactions in one dimension from the perspective of quantum entanglement. Extensive numerical calculations of the entanglement entropy (EE) of the systems are carried out through the density matrix renormalization group algorithm. We demonstrate that the EE can be used for the finite-size scaling (FSS) to characterize the Anderson transition in both noninteracting and interacting systems. From the FSS analysis we can obtain a precise estimate of the critical parameters of the transition. The method can be applied to various one-dimensional models, either interacting or noninteracting, to quantitatively characterize the Anderson transitions.

Zhao, An; Chu, Rui-Lin; Shen, Shun-Qing

2013-05-01

278

A guide to source materials of the life and work of Lawrence B. Anderson '30  

E-print Network

From 1933 to 1976, Professor Lawrence B. Anderson taught in the MIT Department of Architecture, and from 1947 to 1971, he served as its chairman and dean. Concurrently, from 1937 to 1972 , he was principal partner in the ...

Laguette, Victoria, 1953-

1998-01-01

279

Fourier-PARMA Models and Their Application to River Flows Paul L. Anderson  

E-print Network

Fourier-PARMA Models and Their Application to River Flows Paul L. Anderson , Yonas Gebeyehu Tesfaye, it is sometimes useful to generate high- resolution (e.g., weekly) synthetic river flows. Periodic autoregressive

Meerschaert, Mark M.

280

MD Anderson researchers find that drug combination acts against aggressive chronic lymphocytic leukemia  

Cancer.gov

A two-prong approach combining ibrutinib and rituximab (Rituxin) to treat aggressive chronic lymphocytic leukemia (CLL) produced responses with minor side effects in a Phase 2 clinical trial at The University of Texas MD Anderson Cancer Center.

281

Anderson, Denise M., Associate Professor, Parks, Recreation & Tourism Management. BA, Illinois Wesleyan University, 1992;  

E-print Network

231 Faculty Anderson, Denise M., Associate Professor, Parks, Recreation & Tourism Management. BA, Forest, & Environmental Sciences. BS, Texas A&M University, 1993; MS, Oklahoma State University, 1995; Ph, Ali, Adjunct Assistant Professor, School of Agricultural, Forest, & Environmental Sciences. BS, Iran

Stuart, Steven J.

282

Composite pairing in a mixed-valent two-channel Anderson model  

E-print Network

Using a two-channel Anderson model, we develop a theory of composite pairing in the 115 family of heavy fermion superconductors that incorporates the effects of f-electron valence fluctuations. Our calculations introduce ...

Nevidomskyy, Andriy H.

283

Didactique des langues, constitution de la parole et subjectivation Pr. Patrick Anderson  

E-print Network

2013 2014 Didactique des langues, constitution de la parole et subjectivation Pr. Patrick Anderson inconsistance (de Munck, Castoriadis, Le Goff, Castel), déliquescence (Mattéi, Henry, Gauchet), société de l

Jeanjean, Louis

284

MD Anderson researchers discover gene that might predict aggressive prostate cancer at diagnosis  

Cancer.gov

Researchers at The University of Texas MD Anderson Cancer Center have identified a biomarker living next door to the KLK3 gene that could predict which GS7 prostate cancer patients will have a more aggressive form of cancer.

285

MD Anderson researchers find that cancer cells adapt energy needs to spread illness to other organs  

Cancer.gov

Scientists at The University of Texas MD Anderson Cancer Center have found that cancer cells traveling to other sites have different energy needs from their “stay-at-home” siblings which continue to proliferate at the original tumor site.

286

MD Anderson study explains high platelets in ovarian cancer patients; survival reduced  

Cancer.gov

Highly elevated platelet levels fuel tumor growth and reduce the survival of ovarian cancer patients, an international team of researchers led by scientists at The University of Texas MD Anderson Cancer center reports in the New England Journal of Medicine.

287

MD Anderson study finds fetal exposure to radiation increases risk of testicular cancer  

Cancer.gov

Male fetuses of mothers that are exposed to radiation during early pregnancy may have an increased chance of developing testicular cancer, according to a study in mice at The University of Texas MD Anderson Cancer Center.

288

Parabolic Anderson model with a finite number of moving catalysts  

E-print Network

We consider the parabolic Anderson model (PAM) which is given by the equation $\\partial u/\\partial t = \\kappa\\Delta u + \\xi u$ with $u\\colon\\, \\Z^d\\times [0,\\infty)\\to \\R$, where $\\kappa \\in [0,\\infty)$ is the diffusion constant, $\\Delta$ is the discrete Laplacian, and $\\xi\\colon\\,\\Z^d\\times [0,\\infty)\\to\\R$ is a space-time random environment that drives the equation. The solution of this equation describes the evolution of a ``reactant'' $u$ under the influence of a ``catalyst'' $\\xi$. In the present paper we focus on the case where $\\xi$ is a system of $n$ independent simple random walks each with step rate $2d\\rho$ and starting from the origin. We study the \\emph{annealed} Lyapunov exponents, i.e., the exponential growth rates of the successive moments of $u$ w.r.t.\\ $\\xi$ and show that these exponents, as a function of the diffusion constant $\\kappa$ and the rate constant $\\rho$, behave differently depending on the dimension $d$. In particular, we give a description of the intermittent behavior of the sys...

Castell, Fabienne; Maillard, Grégory

2010-01-01

289

Rydberg excitation of Bose-Einstein condensates  

E-print Network

Rydberg atoms provide a wide range of possibilities to tailor interactions in a quantum gas. Here we report on Rydberg excitation of Bose-Einstein condensed 87Rb atoms. The Rydberg fraction was investigated for various excitation times and temperatures above and below the condensation temperature. The excitation is locally blocked by the van der Waals interaction between Rydberg atoms to a density-dependent limit. Therefore the abrupt change of the thermal atomic density distribution to the characteristic bimodal distribution upon condensation could be observed in the Rydberg fraction. The observed features are reproduced by a simulation based on local collective Rydberg excitations.

Rolf Heidemann; Ulrich Raitzsch; Vera Bendkowsky; Björn Butscher; Robert Löw; Tilman Pfau

2007-10-30

290

Pannexin 1 Channels Link Chemoattractant Receptor Signaling to Local Excitation and Global Inhibition Responses at the Front and Back of Polarized Neutrophils*  

PubMed Central

Neutrophil chemotaxis requires excitatory signals at the front and inhibitory signals at the back of cells, which regulate cell migration in a chemotactic gradient field. We have previously shown that ATP release via pannexin 1 (PANX1) channels and autocrine stimulation of P2Y2 receptors contribute to the excitatory signals at the front. Here we show that PANX1 also contributes to the inhibitory signals at the back, namely by providing the ligand for A2A adenosine receptors. In resting neutrophils, we found that A2A receptors are uniformly distributed across the cell surface. In polarized cells, A2A receptors redistributed to the back where their stimulation triggered intracellular cAMP accumulation and protein kinase A (PKA) activation, which blocked chemoattractant receptor signaling. Inhibition of PANX1 blocked A2A receptor stimulation and cAMP accumulation in response to formyl peptide receptor stimulation. Treatments that blocked endogenous A2A receptor signaling impaired the polarization and migration of neutrophils in a chemotactic gradient field and resulted in enhanced ERK and p38 MAPK signaling in response to formyl peptide receptor stimulation. These findings suggest that chemoattractant receptors require PANX1 to trigger excitatory and inhibitory signals that synergize to fine-tune chemotactic responses at the front and back of neutrophils. PANX1 channels thus link local excitatory signals to the global inhibitory signals that orchestrate chemotaxis of neutrophils in gradient fields. PMID:23798685

Bao, Yi; Chen, Yu; Ledderose, Carola; Li, Linglin; Junger, Wolfgang G.

2013-01-01

291

Applicability of bosonization and the Anderson-Yuval methods at the strong-coupling limit of quantum impurity problems  

NASA Astrophysics Data System (ADS)

The applicability of bosonization and the Anderson-Yuval (AY) approach at strong coupling is investigated by considering two generic impurity models: the interacting resonant-level model and the anisotropic Kondo model. The two methods differ in the renormalization of the conduction-electron density of states (DOS) near the impurity site. Reduction in the DOS, absent in bosonization but accounted for in the AY approach, is shown to be vital in some models yet superfluous in others. The criterion is the stability of the strong-coupling fixed point. Renormalization of the DOS is essential for an unstable fixed point but superfluous when a decoupled entity with local dynamics is formed. This rule can be used to boost the accuracy of both methods at strong coupling.

Borda, L.; Schiller, A.; Zawadowski, A.

2008-11-01

292

Superexchange in magnetic insulators: an interpretation of the metal-metal charge transfer energy in the Anderson theory.  

PubMed

The superexchange interactions in four three-center model systems A-L-B, for A and B being paramagnetic centers and L a diamagnetic bridging ligand, are analyzed by valence bond configuration interaction models in combination with fourth-order perturbation theory. We analyze the four distinct cases where a bridging ligand orbital simultaneously interacts with half-filled orbitals localized on A and B (case i), a half-filled orbital localized on A and an empty orbital localized on B (case ii), a full orbital localized on A and a half-filled orbital localized on B (case iii), and finally a full orbital localized on A and an empty orbital localized on B (case iv). In all four cases we compare our new results using localized orbitals with the equivalent results obtained using the Anderson ansatz of delocalized (magnetic) orbitals. The effective metal-to-metal electron transfer energy Ueff in the old formalism with delocalized orbitals is expressed in terms of the metal-to-metal electron transfer energy U and the ligand-to-metal electron transfer energy delta using localized orbitals. We find that the old formalism containing only Ueff is in general not sufficient. For cases i and ii we show that Ueff can be regarded as an effective U strongly reduced with respect to the free ion as a result of hybridization effects, whereas the same reduction of U for the cases iii and iv is not possible. The relevance and applicability of our theoretical results is demonstrated on magnetochemical data from the literature. PMID:12526436

Weihe, H; Güdel, H U; Toftlund, H

2000-04-01

293

Successful salvage therapy with Daptomycin for osteomyelitis caused by methicillin-resistant Staphylococcus aureus in a renal transplant recipient with Fabry-Anderson disease.  

PubMed

Daptomycin is licensed in adults for the management of Staphylococcus aureus methicillin-resistant infections, including bone and skin complicated infections. We describe for the first time its use in a renal transplant recipient for Fabry-Anderson Disease with right heel osteomyelitis. The patient was unresponsive to first-line Teicoplanin and second-line Tigecycline, whereas he was successfully treated with third-line Daptomycin monotherapy at 4 mg/Kg/qd for 4 weeks. Local debridement was performed in advance of each line of treatment. PMID:22404900

Polilli, Ennio; Ursini, Tamara; Mazzotta, Elena; Sozio, Federica; Savini, Vincenzo; D'Antonio, Domenico; Barbato, Michelino; Consorte, Augusta; Parruti, Giustino

2012-01-01

294

Two-Dimensional Anderson Localization in Black Phosphorus Crystals Prepared by Bismuth-Flux Method  

Microsoft Academic Search

The temperature and magnetic field dependence of the electrical resistivity of black phosphorus single crystals prepared by the bismuth-flux method was measured down to 0.5 K in temperature and up to 6 T in magnetic field. While a typical semiconducting behavior of p-type conduction has been observed above about 10 K, the log T-like dependence of the conductivity and the

Mamoru Baba; Fukunori Izumida; Yuji Takeda; Kiyotaka Shibata; Akira Morita; Yoji Koike; Tetsuro Fukase

1991-01-01

295

Anderson Localization of Ballooning Modes, Quantum Chaos and the Stability of Compact Quasiaxially Symmetric Stellarators  

Microsoft Academic Search

A new approach[1] to examining magnetohydrodynamic (MHD) stability is applied to a compact, quasiaxially symmetric stellarator (QAS), predicted to achieve good stability and particle confinement. The magnetic configuration for a proposed medium size experiment, the National Compact Stellarator Experiment (NCSX), has major radius 1.4 m, aspect ratio 4.4, 6 MW of neutral beam heating and a toroidal field of 1.2-1.75

Martha Redi; J. L. Johnson; S. Klasky; J. Canik; R. L. Dewar; W. A. Cooper

2001-01-01

296

Isaac Newton Institute for Mathematical Sciences Mathematics and Physics of Anderson Localization  

E-print Network

of randomly placed scatterers. One of the most striking and far-reaching discoveries of this theory applies to the transport of many types of waves: quantum, electromagnetic, acoustic, and even ocean waves

297

Fermi-surface and charge-spin excitations in strongly correlated electron systems  

Microsoft Academic Search

Fermi-surface and low-energy excitations in a variety of strongly correlated electron systems are studied by using the numerically exact diagonalization method in two-dimensional square lattice. In the one-band Hubbard and extended Hubbard models, the electronic structure in both insulating and metallic states are examined. The structure in the periodic Anderson model is also studied and compared with that in the

S. Maekawa

1995-01-01

298

INET 2000 Anderson, Camp The Telecom Road Less Traveled  

E-print Network

· Connect distant jobs to local people ­ E.g. India · Connect internal markets more effectively ­ E, India, and Pakistan have most competition in the local loop ­ Only these countries and China · Consider · Village entrepreneurs · Advantages ­ Rural population settled in villages ­ Billing infrastructure from

Camp, L. Jean

299

Abrupt physical and chemical changes during 1992-1999, Anderson Springs, SE Geyser Geothermal Field, California  

USGS Publications Warehouse

The Anderson Springs area is located about 90 miles (145 kilometers) north of San Francisco, California, in the southwestern part of Lake County. The area was first developed in the late 1800s as a health resort, which was active until the 1930s. Patrons drank a variety of cool to hot mineral waters from improved springs, swam in various baths and pools, and hiked in the rugged hills flanking Anderson Creek and its tributaries. In the bluffs to the south of the resort were four small mercury mines of the eastern Mayacmas quicksilver district. About 1,260 flasks of mercury were produced from these mines between 1909 and 1943. By the early 1970s, the higher ridges south and west of Anderson Springs became part of the southeast sector of the greater Geysers geothermal field. Today, several electric power plants are built on these ridges, producing energy from a vapor-dominated 240 °C reservoir. Only the main hot spring at Anderson Springs has maintained a recognizable identity since the 1930s. The hot spring is actually a cluster of seeps and springs that issue from a small fault in a ravine southwest of Anderson Creek. Published and unpublished records show that the maximum temperature (Tm) of this cluster fell gradually from 63°C in 1889 to 48°C in 1992. However, Tm of the cluster climbed to 77°C in 1995 and neared boiling (98°C) in 1998. A new cluster of boiling vents and small fumaroles (Tm = 99.3°C) formed in 1998 about 30 m north of the old spring cluster. Several evergreen trees on steep slopes immediately above these vents apparently were killed by the new activity. Thermal waters at Anderson Hot Springs are mostly composed of near-surface ground waters with some added gases and condensed steam from The Geysers geothermal system. Compared to gas samples from Southeast Geysers wells, the hot spring gases are higher in CO2 and lower in H2S and NH3. As the springs increased in temperature, however, the gas composition became more like the mean composition of steam discharges from the Southeast Geysers. The hot spring waters are low in ions of Cl, B, and Li, but relatively high in HCO3, SO4 and NH4. The stable-isotope compositions (deuterium and oxygen-18) of these waters plot near the global meteoric water line. Geochemical data through time reveal apparent maxima in the concentrations of SO4, Fe, and Mn in 1991 to 1992, before the cluster became hotter. The black-to-gray deposits from the new spring cluster are rich in pyrite and contain anomalous metals. About one-half mile to the east of the hot springs, mineralized water discharges intermittently from an old adit of the Schwartz (Anderson) mine, and enters a tributary of Anderson Creek. This drainage increased substantially in July 1998, and a slurry of mine water and precipitates were transported down the tributary and into Anderson Creek. In December 1998, the adit water was 22°C, and had a chemical composition that was similar to spring waters that once discharged in the ravines surrounding the old Anderson Springs resort. The cause for the abrupt changes that have occurred in thermal features at Anderson Springs is still not resolved. One possibility is that these changes are a response to withdrawal of steam from The Geysers geothermal field over more than 20 years of production. Pressure declines in the geothermal reservoir may have caused a "drying out" of the overlying condensation zone. Induced boiling in this zone and upflow of deep steam to shallower depths would cause heating and vaporization of shallow ground waters. In addition, earthquakes occurring in the vicinity of Anderson Springs have increased significantly after nearby geothermal power plants began operation. These earthquakes may have enhanced surface discharge of thermal fluids along fractures and faults.

Janik, Cathy J.; Goff, Fraser; Walter, Stephen R.; Sorey, Michael L.; Counce, Dale; Colvard, Elizabeth M.

2000-01-01

300

Plasmonic excitations in nanostructures  

NASA Astrophysics Data System (ADS)

The prevalent classical model of plasmonic calculations for nano-scale metallic clusters is based on the Mie solution. Which consists of solving Maxwell's equations with the material being represented by a dielectric function on its spatial location. However, such a semi-empirical continuum description necessarily breaks down beyond a certain level of coarseness introduced by atomic length scales. Even the bulk based model used for the dielectric function fails by itself. This limitation of the Mie solution has been established by a quantum mechanical calculation with self-consistent treatment of the dielectric response. In order to understand better the plasmonic excitations at nearly atomic scale, we explored the collective electromagnetic response of atomic chains of various sizes and geometries, and we also computed plasmons in graphene in the presence of an impurity. For the atomic chains, we calculated the plasmonic resonances as a function of the system shape, direction of the external applied field, electron filling and atomic separation. Their frequency, oscillator strength and spatial modulation of the induced charge density were analyzed. It was shown that longitudinal and transverse modes can be controlled in amplitude and frequency by the cluster size. It was also observed an abrupt dependence of the modes on the electronic filling. We also find that changes in atomic spacings have a very different impact on low-energy vs. high-energy modes. And it was seen that changing the position of a single atom in a nanostructure can completely alter its collective dielectric response. This strong sensitivity to small changes is the key to controlling the dielectric properties of atomic scale structures, and it can thus become the gateway to a new generation of quantum devices which effectively utilize quantum physics for new functionalities. For graphene it was shown that impurities induce the formation of nanoscale localized plasmonic excitations in graphene sheets. It was studied the dependence of these excitations on the magnitude and size of the impurity potential and electronic filling. It was shown that the impurity potential and doping can be used to tune the properties of nano-plasmonic excitations, demonstrating that graphene is an inherently plasmonic material. It was found that the chemical potential can be used to turn them on and off, but it does not affect their frequency. While their frequency and amplitude can be tuned by varying the strength of the impurity potential. The method employed for this calculation had not been seen before. In principle the results discussed can be tested experimentally by high-frequency optical probes or STM. These results showed that collective excitations in finite systems have properties different from their bulk correspondents. Since there is not a macroscopic number of electrons in the system, the variation of one single electron causes observable differences. The localized resonant modes are very sensitive to even small variations in the system, for example the position of a single atom. This makes it difficult to establish general rules about the properties of collective excitations in atomic structures. On the other hand it also provides a vast range of possibilities that can be explored for achieving new functionalities.

Muniz, Rodrigo Angelo

301

Global phase diagram of heavy fermions and the Kondo destroyed quantum critical points of Anderson models with a transverse field  

NASA Astrophysics Data System (ADS)

Recent studies in quantum critical heavy fermion metals have pointed towards a global phase diagram [1]. The zero-temperature phase diagram involves a combination of phases, featuring Kondo screening/breakdown and antiferromagnetic order/disorder as the quantum fluctuations of the local moments are tuned relative to their effective interaction with the spins of the conduction electrons. In the case of Ising-anisotropic Kondo lattice systems, the fluctuations among the local moments can be generated by coupling them to a transverse magnetic field. With these effects in mind, we study the Kondo-destroyed quantum critical behavior of the Anderson impurity model in the presence of a bosonic bath or a transverse field. We extend our recent studies of the low-temperature quantum critical behavior [2,3] based on the continuous time quantum Monte Carlo, and obtain the dynamical scaling functions of the local spin susceptibility and single-electron Green's function. [4pt] [1] Q. Si and F. Steglich, Science 329, 1161 (2010). [0pt] [2] M. T. Glossop, S. Kirchner, J. H. Pixley and Q. Si, arXiv:0912.4521 to be published (2009). [0pt] [3] J. H. Pixley, S. Kirchner and Q.Si, arXiv:1010.3024 to be published (2010).

Pixley, Jedediah; Kirchner, Stefan; Si, Qimiao

2011-03-01

302

Observation of the Anderson metal-insulator transition with atomic matter waves: Theory and experiment  

SciTech Connect

Using a cold atomic gas exposed to laser pulses - a realization of the chaotic quasiperiodic kicked rotor with three incommensurate frequencies - we study experimentally and theoretically the Anderson metal-insulator transition in three dimensions. Sensitive measurements of the atomic wave function and the use of finite-size scaling techniques make it possible to unambiguously demonstrate the existence of a quantum phase transition and to measure its critical exponents. By taking proper account of systematic corrections to one-parameter scaling, we show the universality of the critical exponent {nu}=1.59{+-}0.01, which is found to be equal to the one previously computed for the Anderson model.

Lemarie, Gabriel; Delande, Dominique [Laboratoire Kastler Brossel, UPMC-Paris 6, ENS, CNRS, 4 Place Jussieu, F-75005 Paris (France); Chabe, Julien; Szriftgiser, Pascal; Garreau, Jean Claude [Laboratoire PhLAM, , Universite de Lille 1, CNRS, CERLA, F-59655 Villeneuve d'Ascq Cedex (France); Gremaud, Benoit [Laboratoire Kastler Brossel, UPMC-Paris 6, ENS, CNRS, 4 Place Jussieu, F-75005 Paris (France); Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543 (Singapore)

2009-10-15

303

Localization of a Bose-Fermi mixture in a bichromatic optical lattice  

SciTech Connect

We study the localization of a cigar-shaped superfluid Bose-Fermi mixture in a quasiperiodic bichromatic optical lattice (OL) for interspecies attraction and intraspecies repulsion. The mixture is described by the Gross-Pitaevskii equation for the bosons, coupled to a hydrodynamic mean-field equation for fermions at unitarity. We confirm the existence of the symbiotic localized states in the Bose-Fermi mixture and Anderson localization of the Bose component in the interacting Bose-Fermi mixture on a bichromatic OL. The phase diagram in boson and fermion numbers showing the regions of the symbiotic and Anderson localization of the Bose component is presented. Finally, the stability of symbiotic and Anderson localized states is established under small perturbations.

Cheng Yongshan [Instituto de Fisica Teorica, UNESP - Universidade Estadual Paulista, 01.140-070, Sao Paulo, Sao Paulo (Brazil); Department of Physics, Hubei Normal University, 435002 Huangshi (China); Adhikari, S. K. [Instituto de Fisica Teorica, UNESP - Universidade Estadual Paulista, 01.140-070, Sao Paulo, Sao Paulo (Brazil)

2011-08-15

304

CONSTITUTIONAL LAW--Due Process and Equal Protection--Price-Anderson Act's $560,000,000 Limit on Liability From A nuclear Power Plant Accident Is Unconstitutional  

Microsoft Academic Search

Article summarizes Carolina Environmental Study Group v United States Atomic Energy Commission and congressional intent of the Price-Anderson Act. Article then speculates that the Price-Anderson Act will be found to be unconstitutional by the Supreme Court

Michael Fitzgerald

1978-01-01

305

Evaluation of the modified Anderson sampler for determining particle size distributions and respirable concentrations of particulate matter present in the working environment of cottonseed oil mills  

E-print Network

particle sizing head. By equipping an Anderson sampler with an inline air filter, lint particles were effectively removed and particulate matter samples collected without the normal problem of cotton lint particles plugging jets of the Anderson sampler... problem that has occurred with the Anderson sampler, but this has been eliminated by using fiber glass impaction surfaces to hold the particles and reduce re-entrainment (Byers, 1973). The Anderson particle sizing head, as with all multistage jet...

Matlock, Stanley Wayne

2012-06-07

306

Dystopian Visions of Global Capitalism: Philip Reeve's "Mortal Engines" and M.T Anderson's "Feed"  

ERIC Educational Resources Information Center

This article examines Philip Reeve's novel for children, "Mortal Engines", and M.T. Anderson's young adult novel, "Feed", by assessing these dystopias as prototypical texts of what Ulrich Beck calls risk society. Through their visions of a fictional future, the two narratives explore the hazards created by contemporary techno-economic progress,…

Bullen, Elizabeth; Parsons, Elizabeth

2007-01-01

307

Effects of User Similarity in Social Media Ashton Anderson Daniel Huttenlocher Jon Kleinberg Jure Leskovec  

E-print Network

Effects of User Similarity in Social Media Ashton Anderson Daniel Huttenlocher Jon Kleinberg Jure of a social media applica- tion provide evaluations of one another. In a variety of domains, mechanisms- fects. Among other consequences, we find that evaluations are less status-driven when users are more

Thrun, Sebastian

308

MD Anderson study identifies novel therapeutic targets for small cell lung cancer  

Cancer.gov

Newly discovered molecular differences between small cell lung cancer and non-small cell lung cancer have revealed PARP1 and EZH2 as potential therapeutic targets for patients with small cell lung cancer, according to the results of a University of Texas MD Anderson study published in Cancer Discovery, a journal of the American Association for Cancer Research.

309

No strangers here: The minimal relationship effect in interpersonal trust Joanna E. Anderson1  

E-print Network

with others are an essential aspect of life. Parents, peers, authority figures, friends, and romantic partnersNo strangers here: The minimal relationship effect in interpersonal trust Joanna E. Anderson1' trustworthiness. In three studies of the minimal relationship hypothesis, we test an important boundary condition

310

MD Anderson study finds telomere failure, telomerase activation drive prostate cancer progression  

Cancer.gov

Genomic instability caused by an erosion of the protective caps on chromosomes, followed by activation of an enzyme that reinforces those caps, allows malignant cells to evade destruction and acquire more deadly characteristics, MD Anderson Cancer Center researchers report in an Online Now article at the journal Cell.

311

Senate Bills, Anderson Majority Leadership S-669: January 6, 1971; Temporary State Commission on Higher Education  

E-print Network

1 Senate Bills, Anderson Majority Leadership S-669: January 6, 1971; Temporary State Commission/22/1971 Martha Peterson 2/3/1971 Duane A. Dittman 2/4/1971 Frank P. Piskor 2/5/1971 Outgoing: John E. Corbally/8/1971 Martha Peterson 2/16/1971 Earl W. Brydges 5

Suzuki, Masatsugu

312

MD Anderson researchers compare treatments, survival benefits for early-stage lung cancer  

Cancer.gov

Removal of the entire lobe of lung may offer patients with early-stage lung cancer better overall survival when compared with a partial resection, and stereotactic ablative radiotherapy (SABR) may offer the same survival benefit as a lobectomy for some patients, according to a study from The University of Texas MD Anderson Cancer Center.Click here to read the full press release.

313

MD Anderson scientists discover marker to identify, attack breast cancer stem cells  

Cancer.gov

Breast cancer stem cells wear a cell surface protein that is part nametag and part bull’s eye, identifying them as potent tumor-generating cells and flagging their vulnerability to a drug, researchers at The University of Texas MD Anderson Cancer Center report online in Journal of Clinical Investigation.

314

Generation of the S boxes of Tiger Ross Anderson 1 and Eli Biham 2  

E-print Network

Generation of the S boxes of Tiger Ross Anderson 1 and Eli Biham 2 1 Cambridge University, England algorithm of the S boxes of Tiger uses the compression func­ tion of Tiger in order to achieve random the S boxes to the unity columns, and the state to the initial value of the state of Tiger. Then it randomizes

Biham, Eli

315

An Expressive Text-Driven 3D Talking Head Robert Anderson1  

E-print Network

An Expressive Text-Driven 3D Talking Head Robert Anderson1 , Bj¨orn Stenger2 , Vincent Wan2 multiview and photometric stereo we obtain a set of training samples with both depth and normal maps (b). Depth and normals are mapped to the existing AAM, allowing the same synthesis pipeline used for the 2D

Cipolla, Roberto

316

Discrete Scale Spaces via Heat Equation ANDERSON CUNHA, RALPH TEIXEIRA AND LUIZ VELHO  

E-print Network

Discrete Scale Spaces via Heat Equation ANDERSON CUNHA, RALPH TEIXEIRA AND LUIZ VELHO IMPA­Instituto de Matem´atica Pura e Aplicada, mayrink|ralph|lvelho @visgraf.impa.br Abstract. Scale spaces allow us to organize, compare and analyse differently sized structures of an object. The linear scale space

317

The Performance of the Container Shipping I/O System Eric W. Anderson  

E-print Network

Containers) is mapped in and out of process address spaces. Copy elimination provides a large reductionThe Performance of the Container Shipping I/O System Eric W. Anderson Joseph Pasquale {ewa not perform unnecessary memory mappings or copy­on­write operations. Container Shipping unconditionally

Polyzos, George C.

318

Interactive Vector Field Feature Identification Joel Daniels II, Erik W. Anderson, Student Member, IEEE,  

E-print Network

Interactive Vector Field Feature Identification Joel Daniels II, Erik W. Anderson, Student Member) of desired feature types. These control points guide a mapping of the vector field points to the interactive of these attributes forms a representation of the vector field samples in the attribute space. We project

Utah, University of

319

Polar Sea Ice Mapping Using SeaWinds Data Hyrum S. Anderson and David G. Long  

E-print Network

Polar Sea Ice Mapping Using SeaWinds Data Hyrum S. Anderson and David G. Long Brigham Young for mapping polar sea ice extent. In this study, a new al- gorithm for polar sea ice mapping is developed of Bayes detection to produce sea ice extent maps. Statistical models for sea ice and ocean are represented

Long, David G.

320

Kondo screening cloud in the single-impurity Anderson model: A density matrix renormalization group study  

E-print Network

Kondo screening cloud in the single-impurity Anderson model: A density matrix renormalization group cloud when computed from a lattice model.8,9,11,16,17 While there has been experimental progress toward moment in a metal or in a quantum dot is, at low temperatures, screened by the conduction electrons

von Delft, Jan

321

Re ections on \\On the Phonetic Rules of Russian" Stephen R. Anderson  

E-print Network

Re ections on \\On the Phonetic Rules of Russian" Stephen R. Anderson Dept. of Linguistics, Yale as the participants in the second Royaumont conference on Current Trends in Phonology, including Paul Kiparsky the following word begins with a voiced obstruent, in which case they are voiced. E.g., m'ok l,i] `was (he

Goldsmith, John A.

322

MOOD: A Concurrent C++-Based Music Language David Anderson Jeff Bilmes  

E-print Network

MOOD: A Concurrent C++-Based Music Language David Anderson Jeff Bilmes of Technology San Rafael, CA 94901 Cambridge, MA 02139 Introduction MOOD (Musical Object-Oriented Dialect of musical actions. Process Scheduling MOOD provides lightweight processes sharing a single address space

Noble, William Stafford

323

MOOD: A Concurrent C++Based Music Language David Anderson Jeff Bilmes  

E-print Network

MOOD: A Concurrent C++­Based Music Language David Anderson Jeff Bilmes of Technology San Rafael, CA 94901 Cambridge, MA 02139 Introduction MOOD (Musical Object­Oriented Dialect of musical actions. Process Scheduling MOOD provides lightweight processes sharing a single address space

Bilmes, Jeff

324

THE STATIC EXTENSION PROBLEM IN GENERAL RELATIVITY MICHAEL T. ANDERSON AND MARCUS A. KHURI  

E-print Network

THE STATIC EXTENSION PROBLEM IN GENERAL RELATIVITY MICHAEL T. ANDERSON AND MARCUS A. KHURI Abstract. We develop a framework for understanding the existence of asymptotically flat solutions to the static result is obtained, giving a partial resolution of a conjecture of Bartnik on such static vacuum

Anderson, Michael

325

THE STATIC EXTENSION PROBLEM IN GENERAL RELATIVITY MICHAEL T. ANDERSON AND MARCUS A. KHURI  

E-print Network

THE STATIC EXTENSION PROBLEM IN GENERAL RELATIVITY MICHAEL T. ANDERSON AND MARCUS A. KHURI Abstract. We develop a framework for understanding the existence of asymptotically flat solutions to the static existence result is obtained, giving a partial resolution of a conjecture of Bartnik on such static vacuum

Anderson, Michael

326

LEGO MindStorms: Not Just for K-12 Anymore Frank Klassner, Scott D. Anderson  

E-print Network

LEGO MindStorms: Not Just for K-12 Anymore Frank Klassner, Scott D. Anderson Department the possibility of using the Lego Mindstorms robots to support the ACM Computing Curriculum 2001, using them 2001, curriculum development, robotics, Lego Mindstorms Introduction The fields of Robotics

Klassner, Frank

327

In Search of a Statistically Valid Volatility Risk Factor Robert M. Anderson  

E-print Network

Berkeley. We thank Peter Bickel, Robert Korajczyk, James Sefton, Roger Stein and James Xiong for insightfulIn Search of a Statistically Valid Volatility Risk Factor Robert M. Anderson Stephen W. Bianchi discussions about the material in this article. We gratefully acknowledge comments from Andrew Ang, Robert J

Anderson, Robert M.

328

M.D. Anderson study finds previously unconnected molecular networks conspire to promote cancer:  

Cancer.gov

An inflammation-promoting protein triggers deactivation of a tumor-suppressor that usually blocks cancer formation via the NOTCH signaling pathway, a team of researchers led by scientists at The University of Texas M.D. Anderson Cancer Center reports today in Molecular Cell.

329

Study led by MD Anderson scientists identifies prostate cancer stem cells among low-PSA cells  

Cancer.gov

Prostate cancer cells that defy treatment and display heightened tumor-generating capacity can be identified by levels of prostate specific antigen (PSA) expressed in the tumor cells, a research team led by scientists at The University of Texas MD Anderson Cancer Center reports in the May 3 edition of Cell Stem Cell.

330

UT MD Anderson study finds advances in breast cancer don't extend to older women:  

Cancer.gov

The survival rates for older women with breast cancer lag behind younger women diagnosed with the disease, indicating that the elder population may be missing out on improvements in treatment and detection, according to new research from The University of Texas MD Anderson Cancer Center.

331

PROOF COPY [BS7335] 068124PRB Hopping perturbation treatment the periodic Anderson model around atomic limit  

E-print Network

model #PAM# #Ref. one main models studying strongly correlated electrons heavy­fermion systems, mixed Anderson model with strongly correlated subsystems of d f electrons on­site hybridization is investigated, system correlated d f electrons be treated exactly. The delocalization of electrons corresponding

Entel, P.

332

MD Anderson study finds inflammatory mediator promotes colorectal cancer by stifling protective genes:  

Cancer.gov

Chronic inflammation combines with DNA methylation, a process that shuts down cancer-fighting genes, to promote development of colorectal cancer, scientists at The University of Texas MD Anderson Cancer Center report today in the advance online publication of the journal Nature Medicine.

333

MD Anderson develops prognostic model for MDS related to prior cancer therapy  

Cancer.gov

A large-scale analysis of patients whose myelodysplastic syndrome is related to earlier cancer treatment overturns the notion that all of them have a poor prognosis, researchers from the University of Texas MD Anderson Cancer Center report at the 53rd Annual Meeting of the American Society of Hematology.

334

MD Anderson study finds tamoxifen causes significant side effects in male breast cancer patients:  

Cancer.gov

About half of male breast cancer patients who take the drug tamoxifen to prevent their disease from returning report side effects such as weight gain and sexual dysfunction, which prompts more than 20 percent of them to discontinue treatment, according to researchers at The University of Texas MD Anderson Cancer Center.

335

Real-Time Character Animation for Computer Games Eike F Anderson  

E-print Network

three-dimensional game characters which are real-time animated inside the virtual environment into the virtual environment that are non-essential for the game itself, but which will be recognisable as naturalReal-Time Character Animation for Computer Games Eike F Anderson National Centre for Computer

Davies, Christopher

336

PLAYING SMART ANOTHER LOOK AT ARTIFICIAL INTELLIGENCE IN COMPUTER GAMES Eike F Anderson  

E-print Network

controlled NPCs (non-player characters = virtual entities) in the game does not "feel right". The behaviour1 PLAYING SMART ­ ANOTHER LOOK AT ARTIFICIAL INTELLIGENCE IN COMPUTER GAMES Eike F Anderson12 5BB, UK E-mail: eanderson@bournemouth.ac.uk KEYWORDS artificial intelligence, computer games, non

Davies, Christopher

337

Affective Influences on the Attentional Dynamics Supporting Awareness Adam K. Anderson  

E-print Network

Affective Influences on the Attentional Dynamics Supporting Awareness Adam K. Anderson University expe- rience (e.g., Ochsner, 2000), its shaping of initial perceptual experience is less appreciated on the allocation of attention (e.g., Joseph, Chun, & Nakayama, 1997; Mack & Rock, 1998; Ross & Jolicoeur, 1999

Toronto, University of

338

Plate Tectonics as a Far-From-Equilibrium Self-Organized System Don L. Anderson  

E-print Network

Plate Tectonics as a Far- From- Equilibrium Self-Organized System By Don L. Anderson Word Count: 3 and other forces at the top. Plate tectonics was once regarded as passive motion of plates on top of mantle convection cells but it now appears that continents and plate tectonics organize the flow in the mantle

Anderson, Don L.

339

Shouting to be Heard in Advertising Simon P. Anderson and Andr de Palma  

E-print Network

Shouting to be Heard in Advertising Simon P. Anderson and André de Palma July 2011 revised October 2012 Abstract Advertising competes for scarce consumer attention, so more profitable advertisers send of loud shouters or large range of quiet whisperers. All advertisers prefer there to be less shouting

Paris-Sud XI, Université de

340

Age of Acquisition in Connectionist Networks Karen L. Anderson (kanders@cs.ucsd.edu)  

E-print Network

A is a stronger predictor of final Sum Squared Error than frequency. In this paper, we replicate Smith et al as a direct measure of AoA in connectionist networks, Smith, Cottrell & Anderson (in press) have shown that Ao determines AoA? We have found that even very weak pattern similarity structure is a strong predictor of Ao

Cottrell, Garrison W.

341

Climate Indicators of Salmon Survival12 James J. Anderson3 and Richard A. Hinrichsen2  

E-print Network

1 Climate Indicators of Salmon Survival12 James J. Anderson3 and Richard A. Hinrichsen2 School the Columbia River, salmon survival and catch measures were correlated with several Pacific Northwest climate indices. Spring chinook survival rate and catch were varied with the Pacific Northwest climate index (PNI

Washington at Seattle, University of

342

MD Anderson study finds everolimus prolongs progression-free survival for patients with neuroendocrine tumors:  

Cancer.gov

Combination treatment with everolimus, an inhibitor of the mammalian target rapamycin (mTOR), and octreotide has shown to improve progression-free survival for patients with advanced neuroendocrine tumors and a history of carcinoid syndrome, according to researchers at The University of Texas MD Anderson Cancer Center.

343

On the Stability of Web Crawling and Web Reid Anderson1  

E-print Network

On the Stability of Web Crawling and Web Search Reid Anderson1 , Christian Borgs1 , Jennifer Chayes moti- vated by web crawling. We introduce a notion of stable cores, which is the set of web pages that are usually contained in the crawling buffer when the buffer size is smaller than the total number of web

Chaudhuri, Surajit

344

Economic Impact of the 32nd Annual Peter Anderson Arts and Crafts Festival, Ocean Springs, Mississippi  

Microsoft Academic Search

Evaluating the Economic Impact of Festivals and Special Events: Lessons From the 32st Annual Peter Anderson Arts and Crafts Festival in Ocean Springs, Mississippi Background: Festivals are an integral part of the economies of most communities in Mississippi. The economic benefits of festivals can be assigned a dollar value, but no amount of money will accurately reflect the personal and

Albert E. Myles; Rachael Carter

2011-01-01

345

Wildlife Protection, Mitigation, and Enhancement Plans, Anderson Ranch and Black Canyon Facilities: Final Report  

Microsoft Academic Search

Under direction of the Pacific Northwest Electric Power Planning and Conservation Act of 1980, and the subsequent Northwest Power Planning Council's Columbia River Basin Fish and Wildlife Program, projects have been developed in Idaho to mitigate the impacts to wildlife habitat and production due to the development and operation of the Anderson Ranch and Black Canyon Facilities (i.e., dam, power

Meuleman; G. Allyn

1987-01-01

346

UT MD Anderson study finds metabolic protein plays unexpected role in tumor cell formation and growth:  

Cancer.gov

The embryonic enzyme pyruvate kinase M2 (PKM2) has a well-established role in metabolism and is highly expressed in human cancers. Now, a team led by researchers at The University of Texas MD Anderson Cancer Center reports in advance online publication of the journal Nature that PKM2 has important non-metabolic functions in cancer formation.

347

Ac-conductivity and electromagnetic energy absorption for the Anderson model in linear response theory  

E-print Network

We continue our study of the ac-conductivity in linear response theory for the Anderson model using the conductivity measure. We establish further properties of the conductivity measure, including nontriviality at nonzero temperature, the high temperature limit, and asymptotics with respect to the disorder. We also calculate the electromagnetic energy absorption in linear response theory in terms of the conductivity measure.

Abel Klein; Peter Müller

2014-03-03

348

BLACK, WHITE, AND SHADES OF GREY (AND BROWN AND YELLOW) Margo Anderson  

E-print Network

BLACK, WHITE, AND SHADES OF GREY (AND BROWN AND YELLOW) Margo Anderson Department of History that investigates the alleged differences in ``intelligence'' among population groups, such as in Herrnstein about whether, for example, differences in intelligence, however measured, are related to differences

349

MD Anderson researchers reveal genomic diversity of individual lung tumors  

Cancer.gov

Known cancer-driving genomic aberrations in localized lung cancer appear to be so consistently present across tumors that a single biopsy of one region of the tumor is likely to identify most of them, according to a paper published today in Science.

350

GEOMETRIC CHARACTERIZATION OF INTERMITTENCY IN THE PARABOLIC ANDERSON MODEL  

E-print Network

increasing number of `islands' which are located far from each other. These `islands' are local regions, quenched asymptotics, heat equation with random potential. 1 Technische UniversitË?at Berlin, Institut f(t, ·) develops high peaks on islands which are located far from each other and which give the overwhelming

König, Wolfgang

351

Results of a nationwide screening for Anderson-Fabry disease among dialysis patients.  

PubMed

Anderson-Fabry disease is possibly underdiagnosed in patients with end-stage renal disease. Nationwide screening was therefore undertaken for Anderson-Fabry disease among dialysis patients in Austria. Screening for alpha-galactosidase A (AGAL) deficiency was performed by a blood spot test. In patients with a positive screening test, AGAL activity in leukocytes was determined. Individuals with decreased leukocyte AGAL activity were subjected to mutation testing in the GLA gene. Fifty (90.9%) of 55 Austrian hemodialysis centers participated in this study; 2480 dialysis patients (80.1% of the Austrian dialysis population) were screened. In 85 patients, the screening test was positive (85 of 2480, 3.42%; women, 3.32%; men, 3.50%). Among these 85 patients, 4 men (in 3 of whom Anderson-Fabry disease was already known before screening) had a severely decreased and 11 subjects had a borderline low AGAL activity. Genetic testing revealed mutations associated with Fabry disease in all four men with severely decreased AGAL activity resulting in a prevalence of 0.161% for the entire study population. A nationwide screening of dialysis patients permitted detection of a hitherto unknown man with Anderson-Fabry disease. The overall prevalence among dialysis patients was at least ten times higher as compared with recent registry data. Screening programs among patients with end-stage renal disease, especially men, should be put in place to identify families with Anderson-Fabry disease who probably may benefit from specific clinical care, and perhaps from enzyme replacement therapy. In dialysis patients, however, there is no evidence to support enzyme replacement therapy at present. PMID:15100373

Kotanko, Peter; Kramar, Reinhard; Devrnja, Danijela; Paschke, Eduard; Voigtländer, Till; Auinger, Martin; Pagliardini, Severo; Spada, Marco; Demmelbauer, Klaus; Lorenz, Matthias; Hauser, Anna-Christine; Kofler, Hans-Jörg; Lhotta, Karl; Neyer, Ulrich; Pronai, Wolfgang; Wallner, Manfred; Wieser, Clemens; Wiesholzer, Martin; Zodl, Herbert; Födinger, Manuela; Sunder-Plassmann, Gere

2004-05-01

352

Wildlife Protection, Mitigation, and Enhancement Plans, Anderson Ranch and Black Canyon Facilities: Final Report.  

SciTech Connect

Under direction of the Pacific Northwest Electric Power Planning and Conservation Act of 1980, and the subsequent Northwest Power Planning Council's Columbia River Basin Fish and Wildlife Program, projects have been developed in Idaho to mitigate the impacts to wildlife habitat and production due to the development and operation of the Anderson Ranch and Black Canyon Facilities (i.e., dam, power plant, and reservoir areas). The Anderson Ranch Facility covered about 4812 acres of wildlife habitat while the Black Canyon Facility covered about 1115 acres. These acreages include dam and power plant staging areas. A separate mitigation plan has been developed for each facility. A modified Habitat Evaluation Procedure (HEP) was used to assess the benefits of the mitigation plans to wildlife. The interagency work group used the target species Habitat Units (HU's) lost at each facility as a guideline during the mitigation planning process, while considering the needs of wildlife in the areas. Totals of 9619 and 2238 target species HU's were estimated to be lost in the Anderson Ranch and Black Canyon Facility areas, respectively. Through a series of projects, the mitigation plans will provide benefits of 9620 target species HU's to replace Anderson Ranch wildlife impacts and benefits of 2195 target species HU's to replace Black Canyon wildlife impacts. Target species to be benefited by the Anderson Ranch and/or Black Canyon mitigation plans include the mallard, Canada goose, mink, yellow warbler, black-capped chickadee, ruffed grouse, mule deer, blue grouse, sharp-tailed grouse, ring-necked pheasant, and peregrine falcon.

Meuleman, G. Allyn

1987-06-01

353

Global Optimizations for Parallelism and Locality on Scalable Parallel Machines  

E-print Network

. Anderson and Monica S. Lam Computer Systems Laboratory Stanford University, CA 94305 Abstract Data locality in communica­ tion that can greatly impact performance. Thus the mapping, or decomposition, of the computation distributed and shared address space machines. The scope of our algorithm is dense matrix computations where

Pratt, Vaughan

354

DETERMINATION OF LOCAL MAGNITUDE, ML, FROM STRONG MOTION ACCELEROGRAMS  

Microsoft Academic Search

A technique is presented for determination of local magnitude, ML, from strong-motion accelerograms. The accelerograph records are used as an accel- eration input to the equation of motion of the Wood-Anderson torsion seismo- graph to produce a synthetic seismogram which is then read in the standard manner. When applied to 14 records from the San Fernando earthquake, the resulting ML

HIROO KANAMORI; PAUL C. JENNINGS

1978-01-01

355

Localization in the quantum description of the periodically perturbed rotor  

Microsoft Academic Search

In this paper we present some recent results concerning localization phenomena in the quantum dynamics of the periodically perturbed rotor. We discuss the response of a planar rotor and of a diatomic molecule to a periodic train of smooth and finite field pulses and show that both cases correspond to an Anderson model on. a finite grid. The second topic

R. Blümel; S. Fishman; M. Griniasti; U. Smilansky

1986-01-01

356

Calculation of molecular excitation rates  

NASA Technical Reports Server (NTRS)

State-to-state collisional excitation rates for interstellar molecules observed by radio astronomers continue to be required to interpret observed line intensities in terms of local temperatures and densities. A problem of particular interest is collisional excitation of water which is important for modeling the observed interstellar masers. In earlier work supported by a different NASA Grant, excitation of water in collisions with He atoms was studied; after many years of successively more refined calculations that problem now seems to be well understood, and discrepancies with earlier experimental data for related (pressure broadening) phenomena are believed to reflect experimental errors. Because of interstellar abundances, excitation by H2, the dominant interstellar species, is much more important than excitation by He, although it has been argued that rates for excitation by these are similar. Under the current grant theoretical study of this problem has begun which is greatly complicated by the additional degrees of freedom which must be included both in determining the interaction potential and also in the molecular scattering calculation. We have now computed the interaction forces for nearly a thousand molecular geometries and are close to having an acceptable global fit to these points which is necessary for the molecular dynamics calculations. Also, extensive modifications have been made to the molecular scattering code, MOLSCAT. These included coding the rotational basis sets and coupling matrix elements required for collisions of an asymmetric top with a linear rotor. A new method for numerical solution of the coupled equations has been incorporated. Because of the long-ranged nature of the water-hydrogen interaction it is necessary to integrate the equations to rather large intermolecular separations, and the integration methods previously available in MOLSCAT are not ideal for such cases. However, the method used by Alexander in his HIBRIDON code is particularly suited for such cases. We have obtained this code and incorporated that part which solves the coupled differential equations as an option in the MOLSCAT program.

Flynn, George

1993-01-01

357

Evidence of non-mean-field-like low-temperature behavior in the Edwards-Anderson spin-glass model.  

PubMed

The three-dimensional Edwards-Anderson and mean-field Sherrington-Kirkpatrick Ising spin glasses are studied via large-scale Monte Carlo simulations at low temperatures, deep within the spin-glass phase. Performing a careful statistical analysis of several thousand independent disorder realizations and using an observable that detects peaks in the overlap distribution, we show that the Sherrington-Kirkpatrick and Edwards-Anderson models have a distinctly different low-temperature behavior. The structure of the spin-glass overlap distribution for the Edwards-Anderson model suggests that its low-temperature phase has only a single pair of pure states. PMID:23215219

Yucesoy, B; Katzgraber, Helmut G; Machta, J

2012-10-26

358

Mild solution to parabolic Anderson model in Gaussian and Poisson potential  

NASA Astrophysics Data System (ADS)

We consider the parabolic Anderson model in a special random homogeneous potential that is generated by the Gaussian and Poisson random medium together. In our model, the coefficient V(x) is not Hölder continuous with positive probability, and thus the model is unlikely to have a path-wise solution. We construct a mild solution for the parabolic Anderson model with random potential of the form -V(x)=-int _{{R}^d}K(y-x)[? (dy)+W(dy)], where ? and W denote the independent standard Poisson point process and centred Gaussian field, respectively. The case where the potential switches in sign and the Poisson field is absent is handled as well.

Han, Yuecai; Zhang, Liwei

2013-10-01

359

1/(N-1) expansion based on a perturbation theory in U of an SU(N) Anderson impurity  

NASA Astrophysics Data System (ADS)

We propose a new large-N scheme to an N-fold degenerate impurity Anderson model with a finite Coulomb interaction U [1,2]. This approach is different from the conventional theories, such as 1/N expansion and non-crossing approximation, which are based on a perturbation expansion in the hybridization strength V. Our expansion scheme uses a scaling that takes u=(N-1)U as an independent variable, and provides the Hartree-Fock (HF) approximation at zeroth order. Then, to leading order in 1/(N-1) it describes the Hartree-Fock random phase approximation (HF-RPA). The higher-order corrections describe systematically the fluctuations beyond the HF-RPA. We have calculated the renormalized parameters for the local Fermi liquid up to order 1/(N-1)^2, and found that the next-leading-order results agree closely with the exact NRG results at N=4, where the degeneracy is still not really large. This ensures the reliability of our approach for N >=4. We apply this approach to Kondo physics in quantum dots. [1] A.O., R. Sakano, and T. Fujii, PRB 84, 113301 (2011). [2] A.O., PRB 85, 155404 (2012).

Oguri, Akira; Sakano, Rui; Fujii, Tatsuya

2013-03-01

360

Absolutely continuous spectrum for the Anderson model on a product of a tree with a finite graph  

E-print Network

We prove the almost sure existence of absolutely continuous spectrum at low disorder for the Anderson model on the simplest example of a product of a regular tree with a finite graph. This graph contains loops of unbounded size.

Richard Froese; Florina Halasan; David Hasler

2010-08-17

361

Accounting for Interrupts in Multiprocessor RealTime Systems # Bj orn B. Brandenburg, Hennadiy Leontyev, and James H. Anderson  

E-print Network

Accounting for Interrupts in Multiprocessor Real­Time Systems # BjË? orn B. Brandenburg, Hennadiy Leontyev, and James H. Anderson The University of North Carolina at Chapel Hill Abstract The importance

Anderson, James

362

10 CFR 8.2 - Interpretation of Price-Anderson Act, section 170 of the Atomic Energy Act of 1954.  

Code of Federal Regulations, 2011 CFR

...Price-Anderson Act, section 170 of the Atomic Energy Act of 1954. 8.2 Section 8.2 Energy NUCLEAR REGULATORY COMMISSION INTERPRETATIONS...Insurance, in Law and Administration in Nuclear Energy 75 (1959). In the testimony...

2011-01-01

363

10 CFR 8.2 - Interpretation of Price-Anderson Act, section 170 of the Atomic Energy Act of 1954.  

Code of Federal Regulations, 2010 CFR

...Price-Anderson Act, section 170 of the Atomic Energy Act of 1954. 8.2 Section 8.2 Energy NUCLEAR REGULATORY COMMISSION INTERPRETATIONS...Insurance, in Law and Administration in Nuclear Energy 75 (1959). In the testimony...

2010-01-01

364

10 CFR 8.2 - Interpretation of Price-Anderson Act, section 170 of the Atomic Energy Act of 1954.  

Code of Federal Regulations, 2012 CFR

...Price-Anderson Act, section 170 of the Atomic Energy Act of 1954. 8.2 Section 8.2 Energy NUCLEAR REGULATORY COMMISSION INTERPRETATIONS...Insurance, in Law and Administration in Nuclear Energy 75 (1959). In the testimony...

2012-01-01

365

77 FR 72906 - Chessie Logistics Co., LLC-Acquisition and Operation Exemption-J. Emil Anderson & Son, Inc.  

Federal Register 2010, 2011, 2012, 2013

...Docket No. FD 35700] Chessie Logistics Co., LLC--Acquisition and...Anderson & Son, Inc. Chessie Logistics Co., LLC (Chessie), a noncarrier...Erbacher, Legal Counsel, Chessie Logistics Co., LLC, 1001 Green Bay Rd., Unit 204,...

2012-12-06

366

Greek M.D. Anderson Symptom Inventory: Validation and Utility in Cancer Patients  

Microsoft Academic Search

Objective: The M.D. Anderson Symptom Inventory (MDASI) is a brief assessment of the severity and impact of cancer-related symptoms. The purpose of this study was the translation and validation of the questionnaire in Greek (G-MDASI). Methods: The translation and validation of the assessment took place at a Pain Relief and Palliative Care Unit. The final validation sample included 150 cancer

Kyriaki Mystakidou; Charles Cleeland; Eleni Tsilika; Emmanuela Katsouda; Aphrodite Primikiri; Efi Parpa; Lambros Vlahos; Tito Mendoza

2004-01-01

367

COMPLETE LOCALISATION IN THE PARABOLIC ANDERSON MODEL WITH PARETO-DISTRIBUTED POTENTIAL  

E-print Network

for the heat equation tu(t, z) = u(t, z) + (z)u(t, z) on (0, ) � Zd with random potential ((z): z Zd ). We and main results 1.1 The parabolic Anderson model and intermittency We consider the heat equation, Feynman-Kac formula. 1 #12;2 WOLFGANG K¨ONIG, PETER M¨ORTERS, AND NADIA SIDOROVA islands. This effect

368

Psychiatric and cognitive profile in Anderson-Fabry patients: a preliminary study  

Microsoft Academic Search

Anderson-Fabry disease (AFD) is an X-linked inherited lysosomal storage disorder disease caused by a deficiency in the activity\\u000a of the ?-galactosidase enzyme. We investigated neuropsychological and psychiatric function in AFD patients. We studied 16\\u000a AFD patients, aged 7 to 61 years. Intelligence, language, vision-spatial abilities, memory, sensorimotor abilities, and attention\\u000a and executive functions were tested with a computerized test battery as

Perri Segal; Yoav Kohn; Yehuda Pollak; Gheona Altarescu; Esti Galili-Weisstub; Annick Raas-Rothschild

2010-01-01

369

Cellular dynamical mean-field theory of the periodic Anderson model  

Microsoft Academic Search

We develop a cluster dynamical mean-field theory of the periodic Anderson model in three dimensions, taking a cluster of two sites as a basic reference frame. The mean-field theory displays the basic features of the Doniach phase diagram: a paramagnetic Fermi liquid state, an antiferromagnetic state, and a transition between them. In contrast with spin-density wave theories, the transition is

Lorenzo de Leo; Marcello Civelli; Gabriel Kotliar

2008-01-01

370

Natural history of the respiratory involvement in Anderson–Fabry disease  

Microsoft Academic Search

Summary\\u000a Background:  Anderson–Fabry disease (AFD) is an X-linked disorder caused by deficient activity of enzyme ?-galactosidase A, resulting in\\u000a the accumulation of glycosphingolipids within lysosomes. Pulmonary involvement in AFD has previously been documented, but\\u000a until now has been studied only in a few series of patients without any longitudinal follow-up. The aim of this study was\\u000a to compare spirometric changes in

S. Magage; J.-C. Lubanda; Z. Susa; J. Bultas; D. Karetová; R. Dobrovolný; M. H?ebí?ek; D. P. Germain; A. Linhart

2007-01-01

371

Long wavelength optical mode frequencies and the Anderson-Gruneisen parameter for alkali halide crystals  

Microsoft Academic Search

The relation between long wavelength optical mode frequencies and the Anderson-Gruneisen parameter delta for alkali halides studied by Madan suffers from a mathematical error which is rectified in the present communication. A theoretical analysis of delta is presented adopting six potential functions for the short range repulsion energy. Values of delta and gammaTO calculated from the Varshni-Shukla potential are found

A. P. Gupta; Jai Shanker

1980-01-01

372

Many electron variational ground state of the two dimensional Anderson lattice  

SciTech Connect

A variational upper bound of the ground state energy of two dimensional finite Anderson lattices is determined as a function of lattice size (up to 16 x 16). Two different sets of many-electron basis vectors are used to determine the ground state for all values of the coulomb integral U. This variational scheme has been successfully tested for one dimensional models and should give good estimates in two dimensions.

Zhou, Y.; Bowen, S.P. [Argonne National Lab., IL (United States). Materials Science Div.; Mancini, J.D. [Fordham Univ., Bronx, NY (United States). Dept. of Physics

1991-02-01

373

Excitable behaviour in amoeboid chemotaxis  

PubMed Central

Chemotaxis, the directed motion of cells in response to chemical gradients, is a fundamental process. Eukaryotic cells detect spatial differences in chemoattractant receptor occupancy with high precision and use these differences to bias the location of actin-rich protrusions to guide their movement. Research into chemotaxis has benefitted greatly from a systems biology approach that combines novel experimental and computational tools to pose and test hypothesis. Recently, one such hypothesis has been postulated proposing that chemotaxis in eukaryotic cells is mediated by locally biasing the activity of an underlying excitable system. The excitable system hypothesis can account for a number of cellular behaviours related to chemotaxis, including the stochastic nature of the movement of unstimulated cells, the directional bias imposed by chemoattractant gradients, and the observed spatial and temporal distribution of signalling and cytoskeleton proteins. PMID:23757165

Shi, Changji

2013-01-01

374

Characterization of diffuse emissions from the Clinton P. Anderson Meson Physics Facility (LAMPF), Los Alamos National Laboratory, New Mexico  

E-print Network

CHARACTERIZATION OF DIFFUSE EMISSIONS FROM THE CLINTON P. ANDERSON MESON PHYSICS FACILITY (LAMPF), LOS ALAMOS NATIONAL LABORATORY, NEW MEXICO A Thesis by NOEL DAVIS MONTGOMERY Submitted to the Office of Graduate Studies of Texas A...&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE May 1993 Major Subject: Health Physics CHARACTERIZATION OF DIFFUSE EMISSIONS FROM THE CLINTON P. ANDERSON MESON PHYSICS FACILITY (LAMPF), LOS ALAMOS NATIONAL...

Montgomery, Noel Davis

2012-06-07

375

Approximation of modified Anderson-Darling test statistics for extreme value distributions with unknown shape parameter  

NASA Astrophysics Data System (ADS)

Studies of the goodness-of-fit test, which describes how well a model fits a set of observations with an assumed distribution, have long been the subject of statistical research. The selection of an appropriate probability distribution is generally based on goodness-of-fit tests. This test is an effective means of examining how well a sample data set agrees with an assumed probability distribution that represents its population. However, the empirical distribution function test gives equal weight to the differences between the empirical and theoretical distribution functions corresponding to all observations. The modified Anderson-Darling test, suggested by Ahmad et al. (1988), uses a weight function that emphasizes the tail deviations at the upper or lower tails. In this study, we derive new regression equation forms of the critical values for the modified Anderson-Darling test statistics considering the effect of unknown shape parameters. The regression equations are derived using simulation experiments for extreme value distributions such as the log-Gumbel, generalized Pareto, GEV, and generalized logistic models. In addition, power test and at-site frequency analyses are performed to evaluate the performance and to explain the applicability of the modified Anderson-Darling test.

Heo, Jun-Haeng; Shin, Hongjoon; Nam, Woosung; Om, Juseong; Jeong, Changsam

2013-08-01

376

The periodic Anderson model: Symmetry-based results and some exact solutions  

NASA Astrophysics Data System (ADS)

The topic “magnetic impurities in metals” is certainly one of the most studied problems of the solid-state physics in the last years. The interest toward this argument relies on the fact that the interaction between the magnetic moment of the impurities and the conduction electrons of the host metal, is responsible for a large variety of physical phenomena. The simplest model that captures the essential physics of the systems previously mentioned is certainly the periodic Anderson model. This model appeared in the literature for the first time in 1961 in a paper by P.W. Anderson as an attempt to describe in a simplified way the effects of correlations for d-electrons in transition metals. The Hamiltonian of this model cannot be exactly solved in general. Nevertheless, exact results are known in some special cases. The argument of this review is the discussion of some of these exact solutions and the symmetry properties exhibited by the microscopic model Hamiltonian. The review has been organized in such a way that an introductory material is presented to make the main points intelligible to a non-specialist reader even though very recent developments on this topic are also presented. In particular, we will discuss special solutions of the model, holding in any dimension, when one of the interacting couplings of the model vanishes. We want to mention that, in spite of the crudeness of the models so derived, some physical insights can be derived from these simplified versions of the Anderson Hamiltonian. The impossibility of ordering, magnetic or superconducting, will be also discussed. These results hold for any temperature, electron filling and any strength of the parameters of the model,but are confined to low-dimensional cases and are based on the application of the Bogoliubov's inequality. It is also discussed the T=0 version of the Bogoliubov's inequality and it is shown that quantum effects disorder the system, at least in one dimension. Recent studies of the Anderson model showing exact solutions holding for specific values of the microscopic parameters and/or for special filling will be also analyzed. These results are based on the application of spin reflection positivity and on symmetry properties exhibited by Anderson Hamiltonian. Some results in the U=? limit are also presented; namely, we discuss the conditions under which a ferromagnetic ground state is established in one dimension when the number of electrons exceeds by one the number of sites and then, for decorated lattices, we derive the ground-state energy and we construct the corresponding eigenstate. Finally, a simple theorem on the total momentum of the ground state of the symmetric version of the Hamiltonian is presented.

Noce, Canio

2006-08-01

377

Localization for transversally periodic random potentials on binary trees  

E-print Network

We consider a random Schr\\"odinger operator on the binary tree with a random potential which is the sum of a random radially symmetric potential, $Q_r$, and a random transversally periodic potential, $\\kappa Q_t$, with coupling constant $\\kappa$. Using a new one-dimensional dynamical systems approach combined with Jensen's inequality in hyperbolic space (our key estimate) we obtain a fractional moment estimate proving localization for small and large $\\kappa$. Together with a previous result we therefore obtain a model with two Anderson transitions, from localization to delocalization and back to localization, when increasing $\\kappa$. As a by-product we also have a partially new proof of one-dimensional Anderson localization at any disorder.

Richard Froese; Darrick Lee; Christian Sadel; Wolfgang Spitzer; Günter Stolz

2014-08-18

378

Surface plasmon interference excited by tightly focused laser beams.  

SciTech Connect

We show that interfering surface plasmon polaritons can be excited with a focused laser beam at normal incidence to a plane metal film. No protrusions or holes are needed in this excitation scheme. Depending on the axial position of the focus, the intensity distribution on the metal surface is either dominated by interferences between counterpropagating plasmons or by a two-lobe pattern characteristic of localized surface plasmon excitation. Our experiments can be accurately explained by use of the angular spectrum representation and provide a simple means for locally exciting standing surface plasmon polaritons.

Bouhelier, A.; Ignatovich, F.; Bruyant, A.; Huang, C.; Colas des Francs, G.; Weeber, J.-C.; Dereux, A.; Wiederrecht, G. P.; Novotny, L.; Center for Nanoscale Materials; Univ de Bourgogne; Univ. of Rochester; Univ Technologique de Troyes

2007-09-01

379

Surface plasmon interference excited by tightly focused laser beams.  

PubMed

We show that interfering surface plasmon polaritons can be excited with a focused laser beam at normal incidence to a plane metal film. No protrusions or holes are needed in this excitation scheme. Depending on the axial position of the focus, the intensity distribution on the metal surface is either dominated by interferences between counterpropagating plasmons or by a two-lobe pattern characteristic of localized surface plasmon excitation. Our experiments can be accurately explained by use of the angular spectrum representation and provide a simple means for locally exciting standing surface plasmon polaritons. PMID:17767296

Bouhelier, A; Ignatovich, F; Bruyant, A; Huang, C; Colas des Francs, G; Weeber, J-C; Dereux, A; Wiederrecht, G P; Novotny, L

2007-09-01

380

Universal scaling of nonlinear conductance in the two-channel pseudogap Anderson model: Application for gate-tuned Kondo effect in magnetically doped graphene  

NASA Astrophysics Data System (ADS)

Based on the noncrossing approximation, we calculate both the linear and nonlinear conductance within the two-lead two-channel single-impurity Anderson model where the conduction electron density of states vanishes in a power-law fashion ?|?-?F|r with r=1 near the Fermi energy, appropriate for a hexagonal system. For given gate voltage, we address the universal crossover from a two-channel Kondo phase, argued to occur in doped graphene, to an unscreened local moment phase. We extract universal scaling functions in conductance governing charge transfer through the two-channel pseudogap Kondo impurity and discuss our results in the context of a recent scanning tunneling spectroscopy experiment on Co-doped graphene.

Lee, Tsung-Han; Zhang, Kenneth Yi-Jie; Chung, Chung-Hou; Kirchner, Stefan

2013-08-01

381

Excited state dynamics of phthalocyanine films  

SciTech Connect

Femtosecond pump-probe transient absorption measurements were performed for thermally evaporated polycrystalline vanadyl and lead phthalocyanine (VOPc and PbPc) films in order to obtain information about the excitation energy migration and relaxation. The films were shown to be composed of phase II and amorphous material. Fast excitation localization in phase II was concluded from measurement and analysis of the ground and excited state spectra. Comparison of the ground state, difference absorption, and luminescence spectra suggests a small oscillator strength of the electronic transition from the lowest excited state to the ground state. The influence of local heating on the transient spectra is discussed, and the possibility to obtain the excitation decay kinetics free from this influence is proposed. Exciton-exciton annihilation with a time dependent rate (proportional to t{sup -0.5}) is observed in both films. This is explained by one-dimensional diffusion-limited annihilation. Linear relaxation times are equal to 28{+-}6 and 42{+-}8 ps and approximate intermolecular excitation hopping times of 0.1 divide 0.4 and 0.02 divide 0.08 ps were determined for VOPc and PbPc, respectively. 22 refs., 8 figs., 1 tab.

Gulbians, V.; Valkunas, L. [Vilnius Inst. of Physics (Lithuania)] [Vilnius Inst. of Physics (Lithuania); Chachisvillis, M.; Sundstrom, V. [Lund Univ. (Sweden)] [Lund Univ. (Sweden)

1996-02-08

382

Probing Localization in Absorbing Systems via Loschmidt Echos  

E-print Network

We measure Anderson localization in quasi-one-dimensional waveguides in the presence of absorption by analyzing the echo dynamics due to small perturbations. We specifically show that the inverse participation number of localized modes dictates the decay of the Loschmidt echo, differing from the Gaussian decay expected for diffusive or chaotic systems. Our theory, based on a random matrix modeling, agrees perfectly with scattering echo measurements on a quasi one-dimensional microwave cavity filled with randomly distributed scatterers.

Joshua D. Bodyfelt; Mei C. Zheng; Tsampikos Kottos; Ulrich Kuhl; Hans-Jürgen Stöckmann

2009-01-28

383

Probing localization in absorbing systems via Loschmidt echos.  

PubMed

We measure Anderson localization in quasi-one-dimensional waveguides in the presence of absorption by analyzing the echo dynamics due to small perturbations. We specifically show that the inverse participation number of localized modes dictates the decay of the Loschmidt echo, differing from the Gaussian decay expected for diffusive or chaotic systems. Our theory, based on a random matrix modeling, agrees perfectly with scattering echo measurements on a quasi-one-dimensional microwave cavity filled with randomly distributed scatterers. PMID:19659075

Bodyfelt, Joshua D; Zheng, Mei C; Kottos, Tsampikos; Kuhl, Ulrich; Stöckmann, Hans-Jürgen

2009-06-26

384

Utilization of Live Localized Weather Information for Sustainable Agriculture  

Microsoft Academic Search

Authors: Jim Anderson VP, Global Network and Business Development WeatherBug® Professional Jeremy Usher Managing Director, Europe WeatherBug® Professional Localized, real-time weather information is vital for day-to-day agronomic management of all crops. The challenge for agriculture is twofold in that local and timely weather data is not often available for producers and farmers, and it is not integrated into decision-support tools

J. Anderson; J. Usher

2010-01-01

385

8. POWERHOUSE INTERIOR SHOWING EXCITER No. 1 IN FOREGROUND, EXCITER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. POWERHOUSE INTERIOR SHOWING EXCITER No. 1 IN FOREGROUND, EXCITER No. 2., AND GENERATOR UNITS BEHIND EXCITER No. 2 IN BACKGROUND. EXCITER No. 1 GENERATOR HAS A COVER OVER TOP HALF OF COMMUTATOR ELEMENT. VIEW TO NORTHWEST. - Rush Creek Hydroelectric System, Powerhouse Exciters, Rush Creek, June Lake, Mono County, CA

386

Causation's nuclear future: applying proportional liability to the Price-Anderson Act.  

PubMed

For more than a quarter century, public discourse has pushed the nuclear-power industry in the direction of heavier regulation and greater scrutiny, effectively halting construction of new reactors. By focusing on contemporary fear of significant accidents, such discourse begs the question of what the nation's court system would actually do should a major nuclear incident cause radiation-induced cancers. Congress's attempt to answer that question is the Price-Anderson Act, a broad statute addressing claims by the victims of a major nuclear accident. Lower courts interpreting the Act have repeatedly encountered a major stumbling block: it declares that judges must apply the antediluvian preponderance-of-the-evidence logic of state tort law, even though radiation science insists that the causes of radiation-induced cancers are more complex. After a major nuclear accident, the Act's paradoxically outdated rules for adjudicating "causation" would make post-incident compensation unworkable. This Note urges that nuclear-power-plant liability should not turn on eighteenth-century tort law. Drawing on modern scientific conclusions regarding the invariably "statistical" nature of cancer, this Note suggests a unitary federal standard for the Price-Anderson Act--that a defendant be deemed to have "caused" a plaintiff's injury in direct proportion to the increased risk of harm the defendant has imposed. This "proportional liability" rule would not only fairly evaluate the costs borne by injured plaintiffs and protect a reawakening nuclear industry from the prospect of bank-breaking litigation, but would prove workable with only minor changes to the Price-Anderson Act's standards of "injury" and "fault." PMID:25423683

O'Connell, William D

2014-11-01

387

Physical, chemical, and isotopic data for samples from the Anderson Springs area, Lake County, California, 1998-1999  

USGS Publications Warehouse

Anderson Springs is located about 90 miles (145 kilometers) north of San Francisco, California, in the southwestern part of Lake County. The area was first developed in the late 1800s as a health resort, which was active until the 1930s. In the rugged hills to the south of the resort were four small mercury mines of the eastern Mayacmas quicksilver district. About 1,260 flasks of mercury were produced from these mines between 1909 and 1943. In the 1970s, the high-elevation areas surrounding Anderson Springs became part of The Geysers geothermal field. Today, several electric powerplants are located on the ridges above Anderson Springs, utilizing steam produced from a 240°C vapor-dominated reservoir. The primary purpose of this report is to provide physical, chemical, and isotopic data on samples collected in the Anderson Springs area during 1998 and 1999, in response to a Freedom of Information Act request. In July 1998, drainage from the Schwartz adit of the abandoned Anderson mercury mine increased substantially over a 2-day period, transporting a slurry of water and precipitates down a tributary and into Anderson Creek. In August 1998, J.J. Rytuba and coworkers sampled the Schwartz adit drainage and water from the Anderson Springs Hot Spring for base metal and methylmercury analysis. They measured a maximum temperature (Tm) of 85°C in the Hot Spring. Published records show that the temperature of the Anderson Springs Hot Spring (main spring) was 63°C in 1889, 42–52°C from 1974 through 1991, and 77°C in March 1995. To investigate possible changes in thermal spring activity and to collect additional samples for geochemical analysis, C.J. Janik and coworkers returned to the area in September and December 1998. They determined that a cluster of springs adjacent to the main spring had Tm=98°C, and they observed that a new area of boiling vents and small fumaroles (Tm=99.3°C) had formed in an adjacent gully about 20 meters to the north of the main spring. During August–October 1999, several field trips were conducted in the vicinity of Anderson Springs to continue monitoring and sampling the thermal manifestations. The new fumarolic area had increased in temperature and in discharge intensity since 1998, and a zone of dead trees had developed on the steep bank directly west of the fumaroles. Ground temperatures and diffuse flow of CO2 flow through soils were measured in the area surrounding the main spring and new fumaroles and in the zone of tree-kill.

Janik, C. J.; Goff, F.; Sorey, M. L.; Rytuba, J. J.; Counce, D.; Colvard, E. M.; Huebner, M.; White, L. D.; Foster, A.

1999-01-01

388

Modeling short-pulse laser excitation of dielectric materials  

NASA Astrophysics Data System (ADS)

A theoretical description of ultrashort-pulse laser excitation of dielectric materials based on strong-field excitation in the Keldysh picture combined with a multiple-rate-equation model for the electronic excitation including collisional processes is presented. The model includes light attenuation in a self-consistent manner and changing optical properties described in a Drude picture. The model can be used to calculate the electronic excitation as a function of time and depth, and from these quantities the time-dependent optical parameters as well as the ablation depth can be derived. The simulations provide insight into the excitation and propagation dynamics of short-pulse excitation and show that at increasing fluence the excitation becomes localized near the material surface and gives rise to strong modifications of the optical properties of the material.

Wædegaard, K.; Sandkamm, D. B.; Haahr-Lillevang, L.; Bay, K. G.; Balling, Peter

2014-10-01

389

Observation of the Anderson Metal-Insulator Transition with Atomic Matter Waves: Theory and Experiment  

E-print Network

Using a cold atomic gas exposed to laser pulses -- a realization of the chaotic quasiperiodic kicked rotor with three incommensurate frequencies -- we study experimentally and theoretically the Anderson metal-insulator transition in three dimensions. Sensitive measurements of the atomic wavefunction and the use of finite-size scaling techniques make it possible to unambiguously demonstrate the existence of a quantum phase transition and to measure its critical exponents. By taking proper account of systematic corrections to one-parameter scaling, we show the universality of the critical exponent $\

Gabriel Lemarié; Julien Chabé; Pascal Szriftgiser; Jean-Claude Garreau; Benoît Grémaud; Dominique Delande

2009-07-20

390

Machine learning for many-body physics: The case of the Anderson impurity model  

NASA Astrophysics Data System (ADS)

Machine learning methods are applied to finding the Green's function of the Anderson impurity model, a basic model system of quantum many-body condensed-matter physics. Different methods of parametrizing the Green's function are investigated; a representation in terms of Legendre polynomials is found to be superior due to its limited number of coefficients and its applicability to state of the art methods of solution. The dependence of the errors on the size of the training set is determined. The results indicate that a machine learning approach to dynamical mean-field theory may be feasible.

Arsenault, Louis-François; Lopez-Bezanilla, Alejandro; von Lilienfeld, O. Anatole; Millis, Andrew J.

2014-10-01

391

Modified grüneisen and anderson-grüneisen relations for quasispherical molecular liquids  

Microsoft Academic Search

The validity of the expression for the Grüneisen parameter of liquids has been tested by obtaining expressions for the heat\\u000a capacity ratio, isothermal and adiabatic Anderson-Grüneisen parameters,C\\u000a 1-parameter, Rao’s acoustical parameter, Beyer’s non-linearity parameter, and relate them to the Grüneisen parameter. The calculated\\u000a values for five liquefied gases comparising of quasi-spherical molecules are reasonably satisfactory and explain the experimental\\u000a results

B K Sharma

1983-01-01

392

Anderson Hamiltonian description of the experimental electronic structure and magnetic interactions of copper oxide superconductors  

Microsoft Academic Search

We describe valence-band and core-level photoemission data for copper oxide superconductors using the Anderson Hamiltonian applied to an impurity-cluster configuration-interaction model. We obtain experimental values of the parameters of the model the copper oxygen charge transfer energy Delta~0.4 eV, the d-d Coulomb interaction U~6 eV, and the ligand-d hybridization T~2.4 eV. Using these parameters, we evaluate the linear Cu-O-Cu superexchange

Zhi-Xun Shen; J. W. Allen; J. J. Yeh; J.-S. Kang; W. Ellis; W. Spicer; I. Lindau; M. B. Maple; Y. D. Dalichaouch; M. S. Torikachvili; J. Z. Sun; T. Geballe

1987-01-01

393

The Anderson-Darling test of fit for the power law distribution from left censored samples  

E-print Network

Maximum likelihood estimation and a test of fit based on the Anderson-Darling statistic is presented for the case of the power law distribution when the parameters are estimated from a left-censored sample. Expressions for the maximum likelihood estimators and tables of asymptotic percentage points for the A^2 statistic are given. The technique is illustrated for data from the Dow Jones Industrial Average index, an example of high theoretical and practical importance in Econophysics, Finance, Physics, Biology and, in general, in other related Sciences such as Complexity Sciences.

Coronel-Brizio, H F

2010-01-01

394

MD Anderson study finds link between statins and improved survival in inflammatory breast cancer  

Cancer.gov

Researchers from The University of Texas MD Anderson Cancer Center found statins, the commonly used drug to lower cholesterol, improved progression-free survival in patients with inflammatory breast cancer (IBC). The retrospective study was presented in a poster discussion at the 2012 CTRC-AACR San Antonio Breast Cancer Symposium and follows a previously reported Danish study indicating there is some evidence to suggest the anti-inflammatory properties of statins could reduce the risk of breast cancer recurrence. Still, the overall effects of statins have not been examined in relation to IBC.

395

Anisotropic behavior of quantum transport in graphene superlattices: Coexistence of ballistic conduction with Anderson insulating regime  

NASA Astrophysics Data System (ADS)

We report on the possibility to generate highly anisotropic quantum conductivity in disordered graphene-based superlattices. Our quantum simulations, based on an efficient real-space implementation of the Kubo-Greenwood formula, show that in disordered graphene superlattices the strength of multiple scattering phenomena can strongly depend on the transport measurement geometry. This eventually yields the coexistence of a ballistic waveguide and a highly resistive channel (Anderson insulator) in the same two-dimensional platform, evidenced by a ?yy/?xx ratio varying over several orders of magnitude, and suggesting the possibility of building graphene electronic circuits based on the unique properties of chiral massless Dirac fermions in graphene.

Pedersen, Jesper Goor; Cummings, Aron W.; Roche, Stephan

2014-04-01

396

STS-118 Astronaut Williams and Expedition 15 Engineer Anderson Perform EVA  

NASA Technical Reports Server (NTRS)

As the construction continued on the International Space Station (ISS), STS-118 Astronaut Dave Williams, representing the Canadian Space Agency, participated in the fourth and final session of Extra Vehicular Activity (EVA). During the 5 hour space walk, Williams and Expedition 15 engineer Clay Anderson (out of frame) installed the External Wireless Instrumentation System Antenna, attached a stand for the shuttle robotic arm extension boom, and retrieved the two Materials International Space Station Experiments (MISSE) for return to Earth. MISSE collects information on how different materials weather in the environment of space.

2007-01-01

397

MD Anderson study finds blood vessel cells coax colorectal cancer cells into more dangerous state  

Cancer.gov

Blood vessels that supply oxygen and nutrients to tumors can also deliver something else -- a signal that strengthens nearby cancer cells, making them more resistant to chemotherapy, more likely to spread to other organs and more lethal, scientists at The University of Texas MD Anderson Cancer Center report online in Cancer Cell. Working in human colorectal cancer cell lines and tumor samples, as well as mouse models, the researchers found that endothelial cells, which line the inside of blood vessels, can trigger changes in cancer cells without even coming into direct contact with them.

398

STS-107 Payload Commander Michael Anderson during TCDT M113 training activities  

NASA Technical Reports Server (NTRS)

KENNEDY SPACE CENTER, FLA. -- -- STS-107 Payload Commander Michael Anderson takes a break during training on the operation of an M113 armored personnel carrier during Terminal Countdown Demonstration Test activities, a standard part of launch preparations. STS-107 is a mission devoted to research and will include more than 80 experiments that will study Earth and space science, advanced technology development, and astronaut health and safety. Launch is planned for Jan. 16, 2003, between 10 a.m. and 2 p.m. EST aboard Space Shuttle Columbia.

2002-01-01

399

Excitations of the torelon  

Microsoft Academic Search

The excitations of gluonic flux tube in a periodic lattice are examined. Monte Carlo simulations from an anisotropic lattice are presented and the comparison with effective string models is discussed.

K. J. Juge; J. Kuti; F. Maresca; C. Morningstar; M. Peardon

2004-01-01

400

Band of localized electromagnetic waves in random arrays of dielectric cylinders Marian Rusek, Arkadiusz Orlowski, and Jan Mostowski  

E-print Network

Band of localized electromagnetic waves in random arrays of dielectric cylinders Marian Rusek­668 Warszawa, Poland Received 6 February 1997 Anderson localization of electromagnetic waves in random arrays- ies. Electromagnetic waves propagating in these structures mimic, to reasonable extent, the behavior

Rusek, Marian

401

November 1, 1999 / Vol. 24, No. 21 / OPTICS LETTERS 1463 Localization in frequency for periodically kicked light  

E-print Network

that is repeatedly applied at equally spaced locations along the fiber. The effect is analogous to the dynamical that propagate in a dispersive single-mode fiber in the presence of a time-periodic phase modulation localization that occurs for the quantum kicked rotor, which is similar to Anderson localization in disordered

Fischer, Baruch

402

Experiments on excitation waves  

Microsoft Academic Search

Recent trends in the experimentation on chemical and biochemical excitation waves are presented. In the Belousov-Zhabotinsky\\u000a reaction, which is the most suitable chemical laboratory system for the study of wave propagation in excitable medium, the\\u000a efficient control of wave dynamics by electrical fields and by light illumination is illustrated. In particular, the effects\\u000a of a feedback control are shown. Further

S. C. MOiler

403

Molecular analysis and intestinal expression of SAR1 genes and proteins in Anderson's disease (Chylomicron retention disease)  

PubMed Central

Background Anderson's disease (AD) or chylomicron retention disease (CMRD) is a very rare hereditary lipid malabsorption syndrome. In order to discover novel mutations in the SAR1B gene and to evaluate the expression, as compared to healthy subjects, of the Sar1 gene and protein paralogues in the intestine, we investigated three previously undescribed individuals with the disease. Methods The SAR1B, SAR1A and PCSK9 genes were sequenced. The expression of the SAR1B and SAR1A genes in intestinal biopsies of both normal individuals and patients was measured by RTqPCR. Immunohistochemistry using antibodies to recombinant Sar1 protein was used to evaluate the expression and localization of the Sar1 paralogues in the duodenal biopsies. Results Two patients had a novel SAR1B mutation (p.Asp48ThrfsX17). The third patient, who had a previously described SAR1B mutation (p.Leu28ArgfsX7), also had a p.Leu21dup variant of the PCSK9 gene. The expression of the SAR1B gene in duodenal biopsies from an AD/CMRD patient was significantly decreased whereas the expression of the SAR1A gene was significantly increased, as compared to healthy individuals. The Sar1 proteins were present in decreased amounts in enterocytes in duodenal biopsies from the patients as compared to those from healthy subjects. Conclusions Although the proteins encoded by the SAR1A and SAR1B genes are 90% identical, the increased expression of the SAR1A gene in AD/CMRD does not appear to compensate for the lack of the SAR1B protein. The PCSK9 variant, although reported to be associated with low levels of cholesterol, does not appear to exert any additional effect in this patient. The results provide further insight into the tissue-specific nature of AD/CMRD. PMID:21235735

2011-01-01

404

Termination of typical wave-function multifractal spectra at the Anderson metal-insulator transition: Field theory description using the functional renormalization group  

NASA Astrophysics Data System (ADS)

We revisit the problem of wave-function statistics at the Anderson metal-insulator transition (MIT) of noninteracting electrons in d>2 spatial dimensions. At the transition, the complex spatial structure of the critical wave functions is reflected in the nonlinear behavior of the multifractal spectrum of generalized inverse participation ratios (IPRs). Beyond the crossover from narrow to broad IPR statistics, which always occurs for sufficiently large moments of the wave-function amplitude, the spectrum obtained from a typical wave function associated with a particular disorder realization differs markedly from that obtained from the disorder-averaged IPRs. This phenomenon is known as the termination of the multifractal spectrum. We provide a field theoretical derivation for the termination of the typical multifractal spectrum by combining the nonlinear sigma model framework, conventionally used to access the MIT in d=2+? dimensions, with a functional renormalization-group (FRG) technique. The FRG method deployed here was originally pioneered to study the properties of the two-dimensional (2D) random-phase XY model [D. Carpentier and P. Le Doussal, Nucl. Phys. B 588, 565 (2000)]. The same method was used to demonstrate the termination of the multifractal spectrum in the very special problem of 2D Dirac fermions subject to a random Abelian vector potential. Our result shows that the typical multifractal wave-function spectrum and its termination can be obtained at a generic Anderson localization transition in d>2 , within the standard field theoretical framework of the nonlinear sigma model, when combined with the FRG.

Foster, Matthew S.; Ryu, Shinsei; Ludwig, Andreas W. W.

2009-08-01

405

Anderson-Gruneisen parameter under high temperature in (Fe,Mn,Co,Mg)2SiO4  

NASA Astrophysics Data System (ADS)

The Anderson-Grüneisen parameter (?) is of considerable importance to Earth scientists because it sets limitations on the thermo-elastic properties of the lower mantle and core. However, there are several formulations on the Grüneisen parameter, which are in frequent use and predict varying dependence of d as a function of temperature. In this paper, the expressions for thermal expansion, thermal expansion coefficients and bulk modulus are obtained considering the anharmonic dependence on temperature and are applied to study these constants to (Fe,Mn,Co,Mg)2SiO4. Using the derived expressions, we have shown that different parameters on which the Anderson-Grüneisen parameter (?) depends are temperature dependent, but above all the Anderson-Grüneisen parameter (?) is independent of temperature. The results obtained have been found to be comparable to experimental data.

Gupta, S.; Goyal, S. C.

2012-07-01

406

Nutritional influences on early white matter development: response to Anderson and Burggren.  

PubMed

Does breastfeeding alter early brain development? In a recent retrospective study, our group examined the cross-sectional relationship between early infant feeding practice and white matter maturation and cognitive development. In groups matched for child and mother age, gestation duration, birth weight, gender distribution, and socio-economic status; we observed that children who were breastfed exclusively for at least 3 months showed, on average, increased white matter myelin development compared to children who either were exclusively formula-fed, or received a mixture of breast milk and formula. In secondary analysis on sub-sets of these children, again matched for important confounding variables, we found improved cognitive test scores of receptive language in the exclusively breast-fed children compared to formula or formula+breast-fed children; and that prolonged breastfeeding was associated with increased motor, language, and visual functioning in exclusively breast-fed children. In response to this work, Anderson and Burggren have questioned our methodology and, by association, our findings. Further, they use their critique as a platform for advancing an alternative interpretation of our findings: that observed results were not associated with prolonged breast-feeding, but rather delayed the introduction of cow's milk. In this response, we address and clarify some of the misconceptions presented by Anderson and Burggren. PMID:25064669

Deoni, Sean C L; Dean, Douglas C; Walker, Lindsay; Dirks, Holly; O'Muircheartaigh, Jonathan

2014-10-15

407

Anderson-Mott transition in arrays of a few dopant atoms in a silicon transistor.  

PubMed

Dopant atoms are used to control the properties of semiconductors in most electronic devices. Recent advances such as single-ion implantation have allowed the precise positioning of single dopants in semiconductors as well as the fabrication of single-atom transistors, representing steps forward in the realization of quantum circuits. However, the interactions between dopant atoms have only been studied in systems containing large numbers of dopants, so it has not been possible to explore fundamental phenomena such as the Anderson-Mott transition between conduction by sequential tunnelling through isolated dopant atoms, and conduction through thermally activated impurity Hubbard bands. Here, we observe the Anderson-Mott transition at low temperatures in silicon transistors containing arrays of two, four or six arsenic dopant atoms that have been deterministically implanted along the channel of the device. The transition is induced by controlling the spacing between dopant atoms. Furthermore, at the critical density between tunnelling and band transport regimes, we are able to change the phase of the electron system from a frozen Wigner-like phase to a Fermi glass by increasing the temperature. Our results open up new approaches for the investigation of coherent transport, band engineering and strongly correlated systems in condensed-matter physics. PMID:22751223

Prati, Enrico; Hori, Masahiro; Guagliardo, Filippo; Ferrari, Giorgio; Shinada, Takahiro

2012-07-01

408

Three-dimensional localization of ultracold atoms in an optical disordered potential  

NASA Astrophysics Data System (ADS)

In disordered media, quantum interference effects are expected to induce complete suppression of electron conduction. The phenomenon, known as Anderson localization, has a counterpart with classical waves that has been observed in acoustics, electromagnetism and optics, but a direct observation for particles remains elusive. Here, we report the observation of the three-dimensional localization of ultracold atoms in a disordered potential created by a speckle laser field. A phenomenological analysis of our data distinguishes a localized component of the resulting density profile from a diffusive component. The observed localization cannot be interpreted as the classical trapping of particles with energy below the classical percolation threshold in the disorder, nor can it be understood as quantum trapping in local potential minima. Instead, our data are compatible with the self-consistent theory of Anderson localization tailored to our system, involving a heuristic energy shift that offers scope for future interpretation.

Jendrzejewski, F.; Bernard, A.; Müller, K.; Cheinet, P.; Josse, V.; Piraud, M.; Pezzé, L.; Sanchez-Palencia, L.; Aspect, A.; Bouyer, P.

2012-05-01

409

Localized and Extended States in a Disordered Trap  

SciTech Connect

We study Anderson localization in a disordered potential combined with an inhomogeneous trap. We show that the spectrum displays both localized and extended states, which coexist at intermediate energies. In the region of coexistence, we find that the extended states result from confinement by the trap and are weakly affected by the disorder. Conversely, the localized states correspond to eigenstates of the disordered potential, which are only affected by the trap via an inhomogeneous energy shift. These results are relevant to disordered quantum gases and we propose a realistic scheme to observe the coexistence of localized and extended states in these systems.

Pezze, Luca; Sanchez-Palencia, Laurent [Laboratoire Charles Fabry de l'Institut d'Optique, CNRS and Univ. Paris-Sud, Campus Polytechnique, RD 128, F-91127 Palaiseau cedex (France)

2011-01-28

410

Laser pulses for coherent xuv Raman excitation  

E-print Network

We combine multi-channel electronic structure theory with quantum optimal control to derive Raman pulse sequences that coherently populate a valence excited state. For a neon atom, Raman target populations of up to 13% are obtained. Superpositions of the ground and valence Raman states with a controllable relative phase are found to be reachable with up to 4.5% population and phase control facilitated by the pump pulse carrier envelope phase. Our results open a route to creating core-hole excitations in molecules and aggregates that locally address specific atoms and represent the first step towards realization of multidimensional spectroscopy in the xuv and x-ray regimes.

Greenman, Loren; Whaley, K Birgitta

2014-01-01

411

A double-component Anderson-Weiss approach for describing NMR signals of mobile SIn units: Application to constant-time DIPSHIFT experiments  

NASA Astrophysics Data System (ADS)

A composed Gaussian local field is proposed to describe the effect of molecular motions on NMR signals of SIn units (e.g., CHn or NHn), based upon the well-know Anderson-Weiss (AW) approximation. The approach is exemplified on constant-time recoupled dipolar chemical-shift correlation (tC -recDIPSHIFT) experiments, providing an analytical formula that can be used as a fitting function in studies of intermediate-regime motions. By comparison of analytical tC -recDIPSHIFT curves and dynamic spin dynamics simulations, we show that for heteronuclear spin pairs (SI system), the AW treatment assuming the usual Gaussian local field is accurate. However, the approximation fails for the case of SIn spin systems for motional rates higher than a few kHz. Based on earlier work of Terao et al., who proposed a decomposition of CHn dipolar powder patterns into to 2n spin-pair-type patterns, we propose an AW approach based upon a double-Gaussian local field. We derive an analytical formula for tC -recDIPSHIFT signals, and demonstrate its accuracy by comparison with simulations of several motional geometries and rates, and with experimental results for a model sample. The approach is not limited to the tC -recDIPSHIFT experiment and should be of general use in dipolar-coupling based experiments probing (partially) mobile SIn molecular moieties.

Cobo, Marcio Fernando; Reichert, Detlef; Saalwächter, Kay; deAzevedo, Eduardo Ribeiro

2014-11-01

412

Michael T. Martin, "Madeline Anderson in Conversation: Pioneering an African American Documentary Tradition." Black Camera, An International Film Journal, Vol. 5  

E-print Network

Tradition." Black Camera, An International Film Journal, Vol. 5 No. 1 (Fall 2013), 72­93. Madeline Anderson, including Eloyce Gist and ethnographers Zora Neale Hurston and Eslanda Goode Robeson. What follows is a con to make films "useful to improve our people" and conviction eloquently evinced by Anderson in these words

Indiana University

413

ANDERSON-TEIXEIRA FINAL PROOF.DOCX (DO NOT DELETE) 3/7/2011 9:29 AM DO BIOFUELS LIFE CYCLE  

E-print Network

ANDERSON-TEIXEIRA FINAL PROOF.DOCX (DO NOT DELETE) 3/7/2011 9:29 AM 589 DO BIOFUELS LIFE CYCLE ANALYSES ACCURATELY QUANTIFY THE CLIMATE IMPACTS OF BIOFUELS-RELATED LAND USE CHANGE? Kristina J. Anderson in determining the sustainability of biofuels. To ensure that legal standards are effective in limiting climate

DeLucia, Evan H.

414

Patriot Games: Yes, Indeed, the British Are Coming! But M. T. Anderson's Revolutionary War Novel Is Unlike Anything You've Ever Read  

ERIC Educational Resources Information Center

This article presents an interview with 38-year-old writer Matthew Tobin Anderson. In the interview, Anderson talks about his experiences, passion for writing, teenage interests, and his relation to the distinguished writer Mark Twain. He also states the importance of liberty and what it takes to be a patriot and a loyalist. Furthermore, Matthew…

Horning, Kathleen

2006-01-01

415

Practical Local Magnitude Calculation for Local Networks  

NASA Astrophysics Data System (ADS)

In this study, we developed a Matlab application (Ml_Calc) to calculate local magnitude (Ml) for small institudes which has just one or more seismic stations. Ml_Calc algorithm suitable for velocity or acceleration sensors' data obtained by Güralp Systems digitizers. The selected earthquake data can be transferred from SCREAM software to Ml_Calc online or offline. The Ml_Calc algorithm provides two types of solutions for distance, one of them is P-S time differences and the other one is epicentre of earthquake and station coordinates, if earthquake is known. During Ml calculation, instrument correction has been removed and converted to real displacement in milimeter. The obtained displacement data converted to Wood Anderson Seismometer output by using Z=[0;0]; P=[-6.28+4.71j; -6.28-4.71j]; A0=[2080]. Obtained maximum displacement amplitude (A) and distances (dist) used in formula (1) for distances less than 200km and formula (2) for more than 200km. Ml=log10(A)-(-1.118-0.0647*dist+0.00071*dist2-3.39E-6*dist3+5.71e-9*dist4) (1) Ml=log10(A)+(2.1173+0.0082*dist-0.0000059628*dist2) (2) Ml_Calc is a software that easy to implement, can be used for educational purpose and user friendly. Due to this characteristics, Ml_Calc software offered a practical solution to individual users to Ml calculation.

Tunc, B.; Tunc, S.; Caka, D.

2012-12-01

416

Highly excited atoms  

NASA Astrophysics Data System (ADS)

The physics of atoms in which an electron is excited to an exceptionally high energy level, termed Rydberg atoms, is discussed. Similarities between the essential properties of Rydberg atoms and the Bohr conception of the hydrogen atom are pointed out, and classical and quantum mechanical descriptions of atoms in a low-lying state and in a highly excited state are compared. Early observations of Rydberg atoms in the laboratory and in interstellar space are considered, and laboratory methods for the creation of Rydberg atoms are examined, with particular attention given to the excitation of alkali metal atoms to a particular Rydberg state by a tunable laser. Laser spectroscopic studies of the Stark effect in Rydberg atoms, Rydberg atom lifetimes with respect to electron tunneling and the effects of strong magnetic fields on the energy level structures of Rydberg atoms, which have revealed an unidentified apparent underlying symmetry in energy level structures, are presented.

Kleppner, D.; Littman, M. G.; Zimmerman, M. L.

1981-05-01

417

Excitation Methods for Bridge Structures  

SciTech Connect

This paper summarizes the various methods that have been used to excited bridge structures during dynamic testing. The excitation methods fall into the general categories of ambient excitation methods and measured-input excitation methods. During ambient excitation the input to the bridge is not directly measured. In contrast, as the category label implies, measured-input excitations are usually applied at a single location where the force input to the structure can be monitored. Issues associated with using these various types of measurements are discussed along with a general description of the various excitation methods.

Farrar, C.R.; Duffy, T.A.; Cornwell, P.J.; Doebling, S.W.

1999-02-08

418

COMBINATORIAL PROOFS OF FERMAT'S, LUCAS'S, AND WILSON'S PETER G. ANDERSON, ARTHUR T. BENJAMIN, AND JEREMY A. ROUSE  

E-print Network

COMBINATORIAL PROOFS OF FERMAT'S, LUCAS'S, AND WILSON'S THEOREMS PETER G. ANDERSON, ARTHUR T of the form {x, f(x), . . . , fp-1 (x)}. Since p is prime, each set either has size one or size p. The Lucas numbers, 2, 1, 3, 4, 7, 11, 18, 29, 47, . . . , named in honor of Edouard Lucas (1842-1891), are defined

Anderson, Peter G.

419

Coordinating Multiple Spacecraft in Joint Science Campaigns Tara Estlin, Steve Chien, Rebecca Castano, Joshua Doubleday, Daniel Gaines, Robert C. Anderson,  

E-print Network

Castano, Joshua Doubleday, Daniel Gaines, Robert C. Anderson, Charles de Granville, Russell Knight, Gregg rapid data collection from multiple craft on dynamic events such as new Mars dark slope streaks, dust-situ characterization of ice geysers, trace gases, seismic events, and surface changes, such as new gullies and dark

Schaffer, Steven

420

1124 Version of Record (identical to print version). TAXON 61 (5) October 2012: 11241125Anderson & Davis (2091) Conserve Mascagnia  

E-print Network

& Davis · (2091) Conserve Mascagnia (2091) Proposal to conserve the name Mascagnia against Triopterys (Malpighiaceae) William R. Anderson1 & Charles C. Davis2 1 University of Michigan Herbarium, 3600 Varsity Drive Vienna Code Art. 33.3 (McNeill & al. in Regnum Veg. 146. 2006). The generic name was lectotypified

421

EIGENVALUE FLUCTUATIONS FOR LATTICE ANDERSON HAMILTONIANS MAREK BISKUP1, RYOKI FUKUSHIMA2 AND WOLFGANG KNIG3,4  

E-print Network

EIGENVALUE FLUCTUATIONS FOR LATTICE ANDERSON HAMILTONIANS MAREK BISKUP1, RYOKI FUKUSHIMA2. Biskup, R. Fukushima and W. K�nig. Reproduction, by any means, of the entire article for non-commercial purposes is permitted without charge. 1 #12;2 BISKUP, FUKUSHIMA, K�NIG where (d) is the standard lattice

König, Wolfgang

422

EIGENVALUE FLUCTUATIONS FOR LATTICE ANDERSON HAMILTONIANS MAREK BISKUP 1 , RYOKI FUKUSHIMA 2 AND WOLFGANG KNIG 3,4  

E-print Network

EIGENVALUE FLUCTUATIONS FOR LATTICE ANDERSON HAMILTONIANS MAREK BISKUP 1 , RYOKI FUKUSHIMA 2. Fukushima and W. K�nig. Reproduction, by any means, of the entire article for non�commercial purposes is permitted without charge. 1 #12; 2 BISKUP, FUKUSHIMA, K�NIG where # (d) is the standard lattice Laplacian

König, Wolfgang

423

MD Anderson preclinical study identifies 'master' proto-oncogene that regulates stress-induced ovarian cancer metastasis  

Cancer.gov

Scientists at The University of Texas MD Anderson Cancer Center have discovered the signaling pathway whereby a master regulator of cancer cell proteins -- known as Src -- leads to ovarian cancer progression when exposed to stress hormones. The researchers report in the current issue of Nature Communications that beta blocker drugs mitigate this effect and reduce cancer deaths by an average of 17 percent.

424

Working Group E: What is climate? Richard Chandler (Chair), Paul Williams (Rapporteur), Clive Anderson, Daan Crommelin, Chris Farmer,  

E-print Network

Working Group E: What is climate? Richard Chandler (Chair), Paul Williams (Rapporteur), Clive Anderson, Daan Crommelin, Chris Farmer, Hermann Held, John Huthnance, Tim Jupp, David Stainforth, Simon and assumptions (e.g. ergodicity) are required to compute climate as defined above · Suggestions for the Newton

Williams, Paul

425

MD Anderson study finds drug combination improves progression-free survival for women with metastatic breast cancer:  

Cancer.gov

In an international Phase III randomized study, everolimus, when combined with the hormonal therapy exemestane, has been shown to dramatically improve progression-free survival for women with metastatic breast cancer, according to research from The University of Texas MD Anderson Cancer Center.

426

Error Recovery for a Boiler System with OTS PID Controller Tom Anderson, Mei Feng, Steve Riddle, Alexander Romanovsky  

E-print Network

1 Error Recovery for a Boiler System with OTS PID Controller Tom Anderson, Mei Feng, Steve Riddle employing an OTS (Off-The-Shelf) item. The case study used a Simulink model of a steam boiler system, employing software models of the PID controller and the steam boiler system rather than conducting

Newcastle upon Tyne, University of

427

Error Recovery for a Boiler System with OTS PID Controller Tom Anderson, Mei Feng, Steve Riddle, Alexander Romanovsky  

E-print Network

Error Recovery for a Boiler System with OTS PID Controller Tom Anderson, Mei Feng, Steve Riddle-The-Shelf) item. The case study used a Simulink model of a steam boiler system together with an OTS PID in practice, employing software models of the PID controller and the steam boiler system rather than

Newcastle upon Tyne, University of

428

Skrjabinoclava inornatae Wong & Anderson, 1987 (Nematoda: Acuarioidea) as a sporadic parasite of the greater yellowlegs Tringa melanoleuca Gmelin (Aves: Scolopacidae)  

Microsoft Academic Search

Skrjabinoclava inornatae Wong & Anderson, 1987 was found in one of five adult greater yellowlegs Tringa melanoleuca collected near Framboise, Cape Breton, Nova Scotia, Canada. This is the first report of a member of the genus in this host. The infection is regarded as sporadic and a further indication that the host distribution of members of Skrjabinoclava may be determined

R. C. Anderson; C. M. Bartlett

1996-01-01

429

Stevens, Lanning, Anderson, Jacoby, and Chornet Volume 48 October 1998 Journal of the Air & Waste Management Association 979  

E-print Network

Stevens, Lanning, Anderson, Jacoby, and Chornet Volume 48 October 1998 Journal of the Air & Waste Management Association 979 ISSN 1047-3289 J. Air & Waste Manage. Assoc. 48:979-984 Copyright 1998 Air & Waste such as potassium perman- ganate. Electronic air cleaners utilize high voltages to pro- duce ions or ozone to carry

430

Wegner-type bounds for a two-particle continuous Anderson model with an alloy-type external potential  

E-print Network

We consider a two-particle quantum systems in a d-dimensional Euclidean space with interaction and in presence of a random external potential (a continuous two-particle Anderson model). We establish Wegner-type estimates (inequalities) for such models, assessing the probability that random spectra of Hamiltonians in finite volumes intersect a given set.

A. Boutet de Monvel; V. Chulaevsky; P. Stollmann; Y. Suhov

2008-12-14

431

Energy current imaging method for time reversal in elastic media Brian E. Anderson,1,2,a  

E-print Network

Energy current imaging method for time reversal in elastic media Brian E. Anderson,1,2,a Robert A as others for fluid media, could benefit from using a higher resolution imaging method, as the one proposed 16 July 2009 An energy current imaging method is presented for use in locating sources of wave energy

432

MD Anderson study finds SUMO-snipping protein plays crucial role in T and B cell development  

Cancer.gov

When SUMO grips STAT5, a protein that activates genes, it blocks the healthy embryonic development of immune B cells and T cells unless its nemesis breaks the hold, a research team led by scientists at The University of Texas MD Anderson Cancer Center reports in Molecular Cell.

433

[Comment on ``Mechanical Properties and Processes in the Mantle'' by Sykes, Kay and Anderson] Disagreement With Terms  

Microsoft Academic Search

Attention is invited to the misuse of the word `rheology' by some of your writers. See, for example, `Mechanical Properties and Processes in the Mantle,' by Sykes, Kay, and Anderson, in the December issue of EOS.The word `rheology,' as defined in Dictionary of Geological Terms, Dolphin, 1962, page 423; and Glossary of Geology and Earth Sciences with Supplement, American Geological

J. H. Tatsch

1971-01-01

434

Identification and Analysis of Learning Preferences of Mentally Ill Adults in Rehabilitative Psychosocial Therapy at the Anderson Mental Health Center.  

ERIC Educational Resources Information Center

A study identified and analyzed the learning preferences of 17 seriously and chronically mentally ill adults participating in the rehabilitative psychosocial therapy program at the Toxaway Church Site of the Anderson Mental Health Center. Staff perceived as boring and unfocused the traditional treatment approach that relied mainly upon…

Newman, Michael K.

435

Ecient Pure-bu er Algorithms for Real-time Systems 1 James H. Anderson and Philip Holman  

E-print Network

EÃ?cient Pure-bu#11;er Algorithms for Real-time Systems 1 James H. Anderson and Philip Holman for implementing multi-writer read/write pure-bu#11;ers in multiprocessor real-time systems. Such bu#11;ers are commonly used when existing data is overwritten as newly-produced data becomes available. Pure-bu#11;er

Anderson, James

436

Anderson-Gruneisen parameter under high temperature in (Fe,Mn,Co,Mg)2SiO4  

Microsoft Academic Search

The Anderson–Grüneisen parameter (?) is of considerable importance to Earth scientists because it sets limitations on the thermo-elastic properties of the lower mantle and core. However, there are several formulations on the Grüneisen parameter, which are in frequent use and predict varying dependence of d as a function of temperature. In this paper, the expressions for thermal expansion, thermal expansion

S Gupta; S C Goyal

2012-01-01

437

A novel single-side azobenzene-grafted Anderson-type polyoxometalate for recognition-induced chiral migration.  

PubMed

A three-component supramolecular hybrid system based on host-guest recognition and electrostatic interaction has been developed for a consecutive chiral transfer from an alpha-cyclodextrin to cationic dyes via the bridge of a new azobenzene-grafted Anderson-type polyoxometalate cluster. PMID:25089807

Zhang, Bin; Yue, Liang; Wang, Yang; Yang, Yang; Wu, Lixin

2014-09-25

438

Proposal for Themester 2012: Good Behavior, Bad Behavior Instructor: Penelope Anderson, Assistant Professor of English [pea@indiana.edu  

E-print Network

1 Proposal for Themester 2012: Good Behavior, Bad Behavior Instructor: Penelope Anderson, Assistant Professor of English [pea@indiana.edu] Course: English L313, Early Plays of Shakespeare Special topic currently teaching this course (see syllabus below), and am particularly eager to teach it again within

Indiana University

439

Will Dreams Come True? Review of The Atomic Components of Thought, by John R. Anderson and Christian Lebiere  

Microsoft Academic Search

John R. Anderson is a distinguished researcher of cognitive psychology and cognitive science, whose work has helped shape these fields for more than 20 years. He is the Walter VanDyke Bingham Professor of Cognitive Science and a professor in the Department of Psychology at Carnegie Mellon University in Pittsburgh, where he has taught since 1978. He received a Ph.D. from

Franz Schmalhofer

2001-01-01

440

MD Anderson researchers find that the number of younger patients with newly diagnosed colorectal cancer may nearly double by 2030  

Cancer.gov

In the next 15 years, more than one in 10 colon cancers and nearly one in four rectal cancers will be diagnosed in patients younger than the traditional screening age, according to researchers at The University of Texas MD Anderson Cancer Center.

441

Design of a Small-Scale Biodiesel Production System Jeffrey Anderson, Jessica Caceres, Ali Khazaei, Jedidiah Shirey  

E-print Network

Design of a Small-Scale Biodiesel Production System Jeffrey Anderson, Jessica Caceres, Ali Khazaei acreage and biodiesel output. Monte Carlo Simulation Objective: 1) Biodiesel Production Simulation: Determines biodiesel yield and Net Energy Ration of each crop alternative 1) Business Simulation: Determines

442

Fermi-surface and charge-spin excitations in strongly correlated electron systems  

SciTech Connect

Fermi-surface and low-energy excitations in a variety of strongly correlated electron systems are studied by using the numerically exact diagonalization method in two-dimensional square lattice. In the one-band Hubbard and extended Hubbard models, the electronic structure in both insulating and metallic states are examined. The structure in the periodic Anderson model is also studied and compared with that in the above models. In the tJ model as well as the negative U Hubbard model, the excitation spectra in the superconducting states are calculated. In particular, in the tJ model the superconductivity with d(x{sup 2}-y{sup 2})-wave pairing is found to be mapped onto the BCS state. It is shown that the systematic study in a variety of models provides an opportunity to construct a unified picture of strongly correlated systems.

Maekawa, S. [Nagoya Univ. (Japan)

1995-05-01

443

Kondo Stripes in an Anderson-Heisenberg Model of Heavy Fermion Systems  

NASA Astrophysics Data System (ADS)

We study the interplay between the spin-liquid and Kondo physics, as related to the nonmagnetic part of the phase diagram of heavy fermion materials. Within the unrestricted mean-field treatment of the infinite-U 2D Anderson-Heisenberg model, we find that there are two topologically distinct nondegenerate uniform heavy Fermi liquid states that may form as a consequence of the Kondo coupling between spinons and conduction electrons. For certain carrier concentrations, the uniform Fermi liquid becomes unstable with respect to the formation of a new kind of anharmonic “Kondo stripe” state with inhomogeneous Kondo screening strength and the charge density modulation. These features are experimentally measurable and thus may help to establish the relevance of the spin-liquid correlations to heavy fermion materials.

Zhu, Jian-Xin; Martin, I.; Bishop, A. R.

2008-06-01

444

Leveraging Anderson Acceleration for improved convergence of iterative solutions to transport systems  

NASA Astrophysics Data System (ADS)

In this note we demonstrate that using Anderson Acceleration (AA) in place of a standard Picard iteration can not only increase the convergence rate but also make the iteration more robust for two transport applications. We also compare the convergence acceleration provided by AA to that provided by moment-based acceleration methods. Additionally, we demonstrate that those two acceleration methods can be used together in a nested fashion. We begin by describing the AA algorithm. At this point, we will describe two application problems, one from neutronics and one from plasma physics, on which we will apply AA. We provide computational results which highlight the benefits of using AA, namely that we can compute solutions using fewer function evaluations, larger time-steps, and achieve a more robust iteration.

Willert, Jeffrey; Taitano, William T.; Knoll, Dana

2014-09-01

445

Modified Anderson-Darling Test-Based Target Detector in Non-Homogenous Environments  

PubMed Central

A constant false alarm rate (CFAR) target detector in non-homogenous backgrounds is proposed. Based on K-sample Anderson-Darling (AD) tests, the method re-arranges the reference cells by merging homogenous sub-blocks surrounding the cell under test (CUT) into a new reference window to estimate the background statistics. Double partition test, clutter edge refinement and outlier elimination are used as an anti-clutter processor in the proposed Modified AD (MAD) detector. Simulation results show that the proposed MAD test based detector outperforms cell-averaging (CA) CFAR, greatest of (GO) CFAR, smallest of (SO) CFAR, order-statistic (OS) CFAR, variability index (VI) CFAR, and CUT inclusive (CI) CFAR in most non-homogenous situations. PMID:25177800

Li, Yang; Wei, Yinsheng; Li, Bingfei; Alterovitz, Gil

2014-01-01

446

Modified Anderson-Darling test-based target detector in non-homogenous environments.  

PubMed

A constant false alarm rate (CFAR) target detector in non-homogenous backgrounds is proposed. Based on K-sample Anderson-Darling (AD) tests, the method re-arranges the reference cells by merging homogenous sub-blocks surrounding the cell under test (CUT) into a new reference window to estimate the background statistics. Double partition test, clutter edge refinement and outlier elimination are used as an anti-clutter processor in the proposed Modified AD (MAD) detector. Simulation results show that the proposed MAD test based detector outperforms cell-averaging (CA) CFAR, greatest of (GO) CFAR, smallest of (SO) CFAR, order-statistic (OS) CFAR, variability index (VI) CFAR, and CUT inclusive (CI) CFAR in most non-homogenous situations. PMID:25177800

Li, Yang; Wei, Yinsheng; Li, Bingfei; Alterovitz, Gil

2014-01-01

447

Positron excitation of neon  

NASA Technical Reports Server (NTRS)

The differential and total cross section for the excitation of the 3s1P10 and 3p1P1 states of neon by positron impact were calculated using a distorted-wave approximation. The results agree well with experimental conclusions.

Parcell, L. A.; Mceachran, R. P.; Stauffer, A. D.

1990-01-01

448

Exploring Excited Hadrons  

E-print Network

Progress in extracting the spectrum of excited hadron resonances is reviewed and the key issues and challenges in such computations are outlined. The importance of multi-hadron states as simulations are done with lighter pion masses is discussed, and the need for all-to-all quark propagators is emphasized.

Colin Morningstar

2008-10-24

449

Exploring Excited Hadrons  

E-print Network

Progress in extracting the spectrum of excited hadron resonances is reviewed and the key issues and challenges in such computations are outlined. The importance of multi-hadron states as simulations are done with lighter pion masses is discussed, and the need for all-to-all quark propagators is emphasized.

Morningstar, C

2008-01-01

450

JZGOU, A.. Community of Inquiry in E-learning: A Critical Analysis of the Garrison and Anderson Model. The Journal of Distance Education / Revue de l'ducation Distance,  

E-print Network

JéZéGOU, A.. Community of Inquiry in E-learning: A Critical Analysis of the Garrison and Anderson. COMMUNITY OF INQUIRY IN E-LEARNING: A CRITICAL ANALYSIS OF THE GARRISON AND ANDERSON MODEL (Editor's note by Garrison and Anderson (2003) as part of their e-learning research. The authors claim that certain

Paris-Sud XI, Université de

451

Transport across an Anderson quantum dot in the intermediate coupling regime  

NASA Astrophysics Data System (ADS)

We describe linear and nonlinear transport across a strongly interacting single impurity Anderson model quantum dot with intermediate coupling to the leads, i.e. with tunnel coupling ? of the order of the thermal energy k B T. The coupling is large enough that sequential tunneling processes (second order in the tunneling Hamiltonian) alone do not suffice to properly describe the transport characteristics. Upon applying a density matrix approach, the current is expressed in terms of rates obtained by considering a very small class of diagrams which dress the sequential tunneling processes by charge fluctuations. We call this the "dressed second order" (DSO) approximation. One advantage of the DSO is that, still in the Coulomb blockade regime, it can describe the crossover from thermally broadened to tunneling broadened conductance peaks. When the temperature is decreased even further ( k B T < ?), the DSO captures Kondesque behaviours of the Anderson quantum dot qualitatively: we find a zero bias anomaly of the differential conductance versus applied bias, an enhancement of the conductance with decreasing temperature as well as universality of the shape of the conductance as function of the temperature. We can without complications address the case of a spin degenerate level split energetically by a magnetic field. In case spin dependent chemical potentials are assumed and only one of the four chemical potentials is varied, the DSO yields in principle only one resonance. This seems to be in agreement with experiments with pseudo spin [U. Wilhelm, J. Schmid, J. Weis, K.V. Klitzing, Physica E 14, 385 (2002)]. Furthermore, we get qualitative agreement with experimental data showing a cross-over from the Kondo to the empty orbital regime.

Kern, Johannes; Grifoni, Milena

2013-09-01

452

1. LOCALIZATION AND QUANTUM CHAOS: Density of states near the Anderson transition in the (4 - epsilon)-dimensional space  

NASA Astrophysics Data System (ADS)

The calculation of the density of states for the Schrödinger equation with a Gaussian random potential is equivalent to the problem of a second-order transition with a `wrong' sign of the coefficient of the quartic term in the Ginzburg-Landau Hamiltonian. The special role of the dimension d = 4 for such Hamiltonian can be seen from different viewpoints but fundamentally is determined by the renormalizability of the theory. Construction of epsilon-expansion in direct analogy with the phase transitions theory gives rise to a problem of a `spurious' pole. To solve this problem, the proper treatment of the factorial divergency of the perturbation series is necessary. In (4 - epsilon)-dimensional theory, the terms of the leading order in 1/epsilon should be retained for N ~ 1 (N is an order of the perturbation theory) while all degrees of 1/epsilon are essential for large N in view of the fast growth of their coefficients. The latter are calculated in the leading order in N from the Callan-Symanzik equation with results of Lipatov method using as boundary conditions. The qualitative effect consists in shifting of the phase transition point to the complex plane. This results in elimination of the `spurious' pole and in regularity of the density of states for all energies.

Suslov, I. M.

2001-10-01

453

Localization on the Landscape and Eternal Inflation  

E-print Network

We investigate the validity of the assertion that eternal inflation populates the landscape of string theory. We verify that bubble solutions do not satisfy the Klein Gordon equation for the landscape potential. Solutions to the landscape potential within the formalism of quantum cosmology are Anderson localized wavefunctions. Those are inconsistent with inflating bubble solutions. The physical reasons behind the failure of a relation between eternal inflation and the landscape are rooted in quantum phenomena such as interference between wavefunction concentrated around the various vacua in the landscape.

Laura Mersini-Houghton; Malcolm J. Perry

2014-04-22

454

Localization on the landscape and eternal inflation  

NASA Astrophysics Data System (ADS)

We investigate the validity of the assertion that eternal inflation populates the landscape of string theory. We verify that bubble solutions do not satisfy the Klein–Gordon equation for the landscape potential. Solutions to the landscape potential within the formalism of quantum cosmology are Anderson localized wavefunctions. These are inconsistent with inflating bubble solutions. The physical reasons behind the failure of a relation between eternal inflation and the landscape are rooted in quantum phenomena such as interference between wavefunction concentrated around the various vacua in the landscape.

Mersini-Houghton, Laura; Perry, Malcolm J.

2014-11-01

455

Magnetostrictive resonance excitation  

DOEpatents

The resonance frequency spectrum of a magnetostrictive sample is remotely determined by exciting the magnetostrictive property with an oscillating magnetic field. The permeability of a magnetostrictive material and concomitant coupling with a detection coil varies with the strain in the material whereby resonance responses of the sample can be readily detected. A suitable sample may be a magnetostrictive material or some other material having at least one side coated with a magnetostrictive material. When the sample is a suitable shape, i.e., a cube, rectangular parallelepiped, solid sphere or spherical shell, the elastic moduli or the material can be analytically determined from the measured resonance frequency spectrum. No mechanical transducers are required and the sample excitation is obtained without contact with the sample, leading to highly reproducible results and a measurement capability over a wide temperature range, e.g. from liquid nitrogen temperature to the Curie temperature of the magnetostrictive material.

Schwarz, Ricardo B. (Los Alamos, NM); Kuokkala, Veli-Tapani (Tampere, FI)

1992-01-01

456

Excitation of microseisms  

NASA Astrophysics Data System (ADS)

Excitation of microseisms is generally considered to be due to pressure change at ocean bottom, for which Longuet-Higgins derived his celebrated formula in 1950. Use of this formula is an approximation, however. Comparison with a more rigorous normal-mode formula shows that this conventional approach is acceptable for ocean depths less than 1 km but fails in deep oceans. On the other hand, there seems to be a multitude of evidence that source region for double-frequency microseim is near the coast and thus is generally in shallow water. An evidence from buoy data for nonlinearity in ocean waves is presented to support this view. If a source region is in shallow water, use of the Longuet-Higgins pressure formula at ocean bottom for the excitation of microseisms is justified, although one should pay attention to ocean depths very carefully.

Tanimoto, Toshiro

2007-03-01

457

Aperture excited dielectric antennas  

NASA Technical Reports Server (NTRS)

The results of a comprehensive experimental and theoretical study of the effect of placing dielectric objects over the aperture of waveguide antennas are presented. Experimental measurements of the radiation patterns, gain, impedance, near-field amplitude, and pattern and impedance coupling between pairs of antennas are given for various Plexiglas shapes, including the sphere and the cube, excited by rectangular, circular, and square waveguide feed apertures. The waveguide excitation of a dielectric sphere is modeled using the Huygens' source, and expressions for the resulting electric fields, directivity, and efficiency are derived. Calculations using this model show good overall agreement with experimental patterns and directivity measurements. The waveguide under an infinite dielectric slab is used as an impedance model. Calculations using this model agree qualitatively with the measured impedance data. It is concluded that dielectric loaded antennas such as the waveguide excited sphere, cube, or sphere-cylinder can produce directivities in excess of that obtained by a uniformly illuminated aperture of the same cross section, particularly for dielectric objects with dimensions of 2 wavelengths or less. It is also shown that for certain configurations coupling between two antennas of this type is less than that for the same antennas without dielectric loading.

Crosswell, W. F.; Chatterjee, J. S.; Mason, V. B.; Tai, C. T.

1974-01-01

458

Parametric Excitation of a DWSC  

E-print Network

to parametric excitation. This thesis examines the phenomenon of parametric excitation with respect to roll motion in head seas, using time-domain simulation and stability analysis. It examines the DWSC's susceptibility to parametric instability using the same...

Lakhotia, Chandan

2011-08-08

459

Apparatus for photon excited catalysis  

NASA Technical Reports Server (NTRS)

An apparatus is described for increasing the yield of photonically excited gas phase reactions by extracting excess energy from unstable, excited species by contacting the species with the surface of a finely divided solid.

Saffren, M. M. (inventor)

1977-01-01

460

Ultrafast excited state dynamics of tris-  

NASA Astrophysics Data System (ADS)

Time resolved anisotropy measurements and time dependent transient absorption measurements are used to study the evolution of the photoexcited Franck-Condon state to the formation of the long-lived triplet metal-to-ligand charge-transfer (3MLCT) state in tris- (2,2'-bipyridine) ruthenium(II). [Ru(bpy)3]2+ represents a large class of inorganic compounds with interesting and potentially applicable photophysical properties. These compounds have generated much interest in the inorganic chemistry community because their photophysical properties are easily manipulated by synthetic chemistry methods. However, little remains known about the processes which govern the evolution from initial photoexcitation to the formation of the long-lived excited state. Metal to ligand charge transfer, when used to describe inorganic compounds, is a description of how the compound reacts to the absorption of light. Typically, these inorganic compounds are made of a transition metal with organic ligands, consisting of carbon, nitrogen and oxygen, coordinated in a highly symmetrical manner to the metal center. The highest occupied molecular orbitals (HOMO) in these compounds are isoenergetic with the frontier atomic orbitals of the metal and are localized to the metal center. The lowest unoccupied molecular orbitals (LUMO) are isoenergetic with the coordinating ligand orbitals and are localized to the ligands. Upon absorption of light in which an electron is promoted from the HOMO to the LUMO, the electron is excited from the metal to the ligands. Time dependent transient absorption measurements resolve the evolution of the initially excited state to the formation of the 3MLCT state. These measurements also reveal ultrafast dynamics which are characterized as intramolecular in nature and are associated with non-radiative relaxation processes. Symmetry argues the excited state should be delocalized among the bipyridine ligands. Rapid, solvent dependent depolarization of femtosecond anisotropy measurements indicate a change in symmetry of the excited state from a doubly degenerate delocalized state to a singly degenerate localized state. The anisotropy measurements also reveal that localization is facilitated through interactions with the solvent environment. Two distinct processes have been resolved in the evolution of the [Ru(bpy) 3]2+ Franck-Condon state to the formation of the 3MLCT state. Charge localization and ultrafast dynamics associated with non-radiative relaxation pathways are distinguished by their susceptibility to intermolecular interactions. These experiments represent the first measurements resolving these processes in the [Ru(bpy)3]2+ metal to ligand charge transfer complex.

Yeh, Alvin Tien-Wei

461

Fragment-based configuration interaction wave function to calculate environmental effect on excited states in proteins and solutions  

NASA Astrophysics Data System (ADS)

Solvatochromic effect in proteins and solutions was described by a configuration interaction singles (CIS) wave function with fragment-localized molecular orbitals. Coarse-grained analysis indicated that the CI wave function can be described by local excitations and charge-transfer (CT) excitations between the chromophore and the environment. We developed an atomic-orbital direct runcated CIS code and applied the excited states of retinal chromophore in bacteriorhodopsin and MeOH environments, and those of s-trans-acrolein in water. Number of excitation operators was significantly reduced by eliminating the CT excitations between the environmental fragments. The truncated CIS wave functions reproduced the original excitation energies very well.

Hasegawa, Jun-ya

2013-05-01

462

Statistical crossover characterization of the heterotic localized-extended transition.  

PubMed

We investigated the spectral statistics of a quantum particle in a superlattice consisting of a disordered layer and a clean layer, possibly accompanied by random magnetic fields. Because a disordered layer has localized states and a clean layer has extended states, our quantum system shows a heterotic phase of an Anderson insulator and a normal metal. As the ratio of the volume of these two layers changes, the spectral statistics change from Poissonian to one of the Gaussian ensembles which characterize quantum chaos. A crossover distribution specified by two parameters is introduced to distinguish the transition from an integrable system to a quantum chaotic system during the heterotic phase from an Anderson transition in which the degree of random potentials is homogenous. PMID:12935237

Ugajin, Ryuichi

2003-07-01

463

Estimation of local magnitude of rockbursts using strong motion accelerograms in the mines of Kolar Gold Fields  

Microsoft Academic Search

Rockbursts are minor earthquakes induced due to mining operations. The seismic signals recorded using geophones in the near field are generally saturated and are not suitable for estimating the true magnitudes. The strong-motion accelerograms recorded due to rockbursts are therefore used to obtain the Wood-Anderson synthetic seismograms for getting accurate and reliable values of the local magnitudes. Using several typical

Chinnappa Srinivasan; Yesurathenam Ahnoch Willy; Iswar D. Gupta

2010-01-01

464

Strong correlation induced charge localization in antiferromagnets  

PubMed Central

The fate of a hole injected in an antiferromagnet is an outstanding issue of strongly correlated physics. It provides important insights into doped Mott insulators closely related to high-temperature superconductivity. Here, we report a systematic numerical study of t-J ladder systems based on the density matrix renormalization group. It reveals a surprising result for the single hole's motion in an otherwise well-understood undoped system. Specifically, we find that the common belief of quasiparticle picture is invalidated by the self-localization of the doped hole. In contrast to Anderson localization caused by disorders, the charge localization discovered here is an entirely new phenomenon purely of strong correlation origin. It results from destructive quantum interference of novel signs picked up by the hole, and since the same effect is of a generic feature of doped Mott physics, our findings unveil a new paradigm which may go beyond the single hole doped system. PMID:24002668

Zhu, Zheng; Jiang, Hong-Chen; Qi, Yang; Tian, Chushun; Weng, Zheng-Yu

2013-01-01

465

Highly excited atoms  

SciTech Connect

Highly excited atoms are often called Rydberg atoms. These atoms have a wealth of exotic properties which are discussed. Of special interest, are the effects of electric and magnetic fields on Rydberg atoms. Ordinary atoms are scarcely affected by an applied electric or magnetic field; Rydberg atoms can be strongly distorted and even pulled apart by a relatively weak electric field, and they can be squeezed into unexpected shapes by a magnetic field. Studies of the structure of Rydberg atoms in electric and magnetic fields have revealed dramatic atomic phenomena that had not been observed before. (SC)

Kleppner, D.; Littman, M.G.; Zimmerman, M.L.

1981-05-01

466

An overview of the comprehensive proton therapy machine quality assurance procedures implemented at The University of Texas M. D. Anderson Cancer Center Proton Therapy Center-Houston  

SciTech Connect

The number of proton and carbon ion therapy centers is increasing; however, since the publication of the International Commission on Radiation Units and Measurements report, there has been no dedicated report dealing with proton therapy quality assurance. The purpose of this article is to describe the quality assurance procedures performed on the passively scattered proton therapy beams at The University of Texas M. D. Anderson Cancer Center Proton Therapy Center in Houston. The majorities of these procedures are either adopted from procedures outlined in the American Association of Physicists in Medical Task Group (TG) 40 report or are a modified version of the TG 40 procedures. In addition, new procedures, which were designed specifically to be applicable to the synchrotron at the author's center, have been implemented. The authors' procedures were developed and customized to ensure patient safety and accurate operation of synchrotron to within explicit limits. This article describes these procedures and can be used by others as a guideline for developing QA procedures based on particle accelerator specific parameters and local regulations pertinent to any new facility.

Arjomandy, Bijan; Sahoo, Narayan; Zhu, X. Ronald; Zullo, John R.; Wu, Richard Y.; Zhu Mingping; Ding Xiaoning; Martin, Craig; Ciangaru, George; Gillin, Michael T. [Department of Radiation Physics, University of Texas M. D. Anderson Cancer Center, 1840 Old Spanish Trail, Houston, Texas 77025 (United States)

2009-06-15

467

Towards Unit Testing RealTime Schedulers in LITMUS RT Malcolm S. Mollison, Bj orn B. Brandenburg, and James H. Anderson  

E-print Network

Towards Unit Testing Real­Time Schedulers in LITMUS RT Malcolm S. Mollison, BjË? orn B. Brandenburg, and James H. Anderson Department of Computer Science, The University of North Carolina at Chapel Hill

Anderson, James

468

A Flexible RealTime Locking Protocol for Multiprocessors # Aaron Block, Hennadiy Leontyev, Bj orn B. Brandenburg, and James H. Anderson  

E-print Network

A Flexible Real­Time Locking Protocol for Multiprocessors # Aaron Block, Hennadiy Leontyev, BjË? orn B. Brandenburg, and James H. Anderson Department of Computer Science, University of North Carolina

Anderson, James

469

Seminal events that marked its reemergence were the publication of Hinton and Anderson (1981), the Cognitive Science Society meetings in 1984, and the publication of the PDP volumes  

E-print Network

1 Seminal events that marked its reemergence were the publication of Hinton and Anderson (1981 Bechtel and Abrahamsen, 1991, Clark, 1989, 1993, and papers in Horgan and Tienson, 1991, and Ramsey, Stich

Bechtel, William

470

Band-gap enhancement in core-excited metals  

NASA Astrophysics Data System (ADS)

Through analyses of the density-matrix equations of motion for electrons in metals, we show that the energy band gap is enhanced when many electrons are excited from core to valence bands, indicating a tendency opposite to the band-gap reduction observed in the valence-electron excitation of semiconductors; it is a consequence of inhomogeneous excitation from highly localized core to delocalized valence bands. Such a band-gap enhancement suggests a blue shift of the photoabsorption edge, leading to a possibility of demonstrating saturable absorber switching by means of intense EUV or X-ray free-electron-laser pulses.

Kitamura, Hikaru

2011-04-01

471

MD Anderson study finds weekly dose reduces a targeted drug's side effects but not its activity against acute lymphocytic leukemia  

Cancer.gov

A potent chemotherapy agent wrapped within a monoclonal antibody selectively destroys the malignant cells responsible for acute lymphocytic leukemia (ALL) in either weekly or monthly dosing, researchers report at the 54th ASH Annual Meeting and Exposition. This "Trojan horse" assault on the cancer cells has significantly increased the response rate among patients with ALL, and now an MD Anderson Cancer Center clinical trial finds that weekly dosing works well and reduces side effects.

472

Life and death in the cytoplasm: messages from the 3 end Marvin Wickens, Philip Anderson and Richard J Jackson  

E-print Network

220 Life and death in the cytoplasm: messages from the 3 end Marvin Wickens, Philip Anderson: `decapping'. In this process, the m7GpppG cap structure at the 5 end of the mRNA is removed, apparently/poly(A) complex and the 5 cap of the same mRNA (review in [1,7]). On the basis of studies of the effects of poly

Wickens, Marv

473

MD Anderson study finds majority of older, early-stage breast cancer patients benefit from radiation after lumpectomy  

Cancer.gov

For the majority of older, early-stage breast cancer patients, radiation therapy following breast conserving surgery may help prevent the need for a later mastectomy, according to research from The University of Texas MD Anderson Cancer Center. The findings, published in the journal Cancer, are contrary to current national treatment guidelines, which recommend that older women with early stage, estrogen-positive disease be treated with lumpectomy followed by estrogen blocker therapy alone -- and forgo radiation therapy post-surgery.

474

Anderson-Fabry disease: clinical manifestations and impact of disease in a cohort of 98 hemizygous males  

Microsoft Academic Search

OBJECTIVESTo determine the natural history of Anderson-Fabry disease (AFD) as a baseline for efficacy assessment of potentially therapeutic drugs.DESIGNThe first large cross sectional study of a patient cohort from the AFD clinical and genetic register (UK), maintained for the last 15 years.MEASURESPrevalence, mortality, frequency of AFD manifestations, and impact of disease on patient lives, assessed from the AFD register and

K D MacDermot; A Holmes; A H Miners

2001-01-01

475

MD Anderson study finds lung cancer patients live longer if they use beta-blockers while receiving radiotherapy  

Cancer.gov

Patients with non-small-cell lung cancer survive longer if they are taking beta-blockers while receiving radiotherapy, according to a study of 722 patients published in the cancer journal Annals of Oncology. Researchers at the University of Texas MD Anderson Cancer Center reviewed the progress and outcomes of patients who had received radiotherapy as their main or first line of treatment for cancer.

476

Nailing the Coffin Shut on Doubts That Violent Video Games Stimulate Aggression: Comment on Anderson et al. (2010)  

Microsoft Academic Search

Over the past half century the mass media, including video games, have become important socializers of children. Observational learning theory has evolved into social–cognitive information processing models that explain that what a child observes in any venue has both short-term and long-term influences on the child’s behaviors and cognitions. C. A. Anderson et al.’s (2010) extensive meta-analysis of the effects

L. Rowell Huesmann

2010-01-01

477

Ecient Pure-bu er Algorithms for Real-time Systems James H. Anderson and Philip Holman  

E-print Network

EÃ?cient Pure-bu#11;er Algorithms for Real-time Systems #3; James H. Anderson and Philip Holman-free algorithms for implementing read/write bu#11;ers in real-time systems. Such bu#11;ers are commonly used be overwritten. Each of our algorithms is a \\pure-bu#11;er" algorithm. In a pure- bu#11;er algorithm, several bu

Anderson, James

478

MD Anderson-led study finds metabolic protein wields phosphate group to activate cancer-promoting genes  

Cancer.gov

A metabolic protein that nourishes cancer cells also activates tumor-promoting genes by loosening part of the packaging that entwines DNA to make up chromosomes, a team led by scientists at The University of Texas MD Anderson Cancer Center reports in the Aug. 16 issue of Cell. Working in cell lines and mouse models of glioblastoma multiforme, the most lethal form of brain tumor, the team showed that pyruvate kinase M2 (PKM2) fuels tumor growth by influencing a histone protein.

479

A review of "Bradford’s Books: Of Plymouth Plantation and the Printed Word." by Douglas Anderson  

E-print Network

, but what those lessons are, remains unsaid. Although this study has the weaknesses of an early selection, both scholars are young and audacious, and their insights will deepen over time. When the authors resonate with a particular writer, their readings... are more persuasive: the resourceful, idiosyncratic Aphra Behn fits their theory better than the others; chapter five was their best. Douglas Anderson. William Bradford?s Books: Of Plymouth Plantation and the Printed Word. Baltimore: Johns Hopkins...

William J. Scheick

2003-01-01

480

An inventory of wetlands in the East Fork Poplar Creek floodplain, Anderson and Roane Counties, Tennessee  

SciTech Connect

An inventory of wetlands within the floodplain of East Fork Poplar Creek (EFPC) in Anderson and Roane Counties, Tennessee was conducted during October, 1991 through May, 1992 for the US Department of Energy (DOE) by the US Army Corps of Engineers, Nashville District. About 15 miles of EFPC channel and 500 acres of its floodplain are contaminated with mercury and other contaminants released from the Y-12 Plant on the DOE Oak Ridge Reservation. The wetland inventory will serve as baseline information for DOE`s remedial action planning and National Environmental Policy Act compliance efforts related to the contamination. In order to provide broad wetland determinations beyond which future wetland definitions are unlikely to expand, the 1989 Federal Manual for Identifying And Delineating Jurisdictional Wetlands was utilized. Using the manual`s methodology in a contaminated system under the approved health and safety plan presented some unique problems, resulting in intrusive sampling for field indicators of hydric soils being accomplished separately from observation of other criteria. Beginning with wetland areas identified on National Wetland Inventory Maps, the entire floodplain was examined for presence of wetland criteria, and 17 wetlands were identified ranging from 0.01 to 2.81 acres in size. The majority of wetlands identified were sized under 1 acre. Some of the wetlands identified were not delineated on the National Wetland Inventory Maps, and much of the wetland area delineated on the maps did not meet the criteria under the 1989 manual.

NONE

1992-12-01

481

Two-channel pseudogap Kondo and Anderson models: Quantum phase transitions and non-Fermi liquids  

NASA Astrophysics Data System (ADS)

We discuss the two-channel Kondo problem with a pseudogap density of states ?(?)?|?|r of the bath fermions. Combining both analytical and numerical renormalization group techniques, we characterize the impurity phases and quantum phase transitions of the relevant Kondo and Anderson models. The line of stable points, corresponding to the overscreened non-Fermi-liquid behavior of the metallic r=0 case, is replaced by a stable particle-hole-symmetric intermediate-coupling fixed point for 0rmax, this non-Fermi-liquid phase disappears, and instead a critical fixed point with an emergent spin-channel symmetry appears, controlling the quantum phase transition between two phases with stable spin and channel moments, respectively. We propose low-energy field theories to describe the quantum phase transitions, all being formulated in fermionic variables. We employ ? expansion techniques to calculate critical properties near the critical dimensions r=0 and 1, the latter being potentially relevant for two-channel Kondo impurities in neutral graphene. We find the analytical results to be in excellent agreement with those obtained from applying Wilson’s numerical renormalization group technique.

Schneider, Imke; Fritz, Lars; Anders, Frithjof B.; Benlagra, Adel; Vojta, Matthias

2011-09-01

482

Magnetic flux creep in HTSC and Anderson-Kim theory (Review Article)  

NASA Astrophysics Data System (ADS)

Theoretical results and experimental data on flux creep in high-temperature superconductors (HTSC) are analyzed in this review paper. When reviewing experimental work, the main attention is paid to the most striking experimental results which have had a major impact on the study of flux creep in HTSC. On the other hand, the analysis of theoretical results is focused on the studies which explain the features of flux creep by introducing modifications to the Anderson-Kim (AK) theory, i.e., on the studies that have not received sufficient attention earlier. However, it turned out that the modified AK theory could explain a number of features of flux creep in HTSC: the scaling behavior of current-voltage curves in HTSC, the finite rate of flux creep at ultralow temperatures, the logarithmic dependence of the effective pinning potential on the transport current and its decrease with temperature. The harmonic potential field which is used in this approach makes it possible to solve accurately both the problem of viscous vortex motion and the problem of thermally activated flux creep in this magnetic field. Moreover, the energy distribution of pinning potential and the interaction of vortices with each other are also taken into account in the approach. Thus, the modification of the AK theory consists, essentially, in its refinement and achieving a more realistic approximation.

Lykov, A. N.

2014-09-01

483

A finite-frequency functional renormalization group approach to the single impurity Anderson model  

NASA Astrophysics Data System (ADS)

We use the Matsubara functional renormalization group (FRG) to describe electronic correlations within the single impurity Anderson model. In contrast to standard FRG calculations, we account for the frequency dependence of the two-particle vertex in order to address finite-energy properties (e.g, spectral functions). By comparing with data obtained from the numerical renormalization group (NRG) framework, the FRG approximation is shown to work well for arbitrary parameters (particularly finite temperatures) provided that the electron-electron interaction U is not too large. We demonstrate that aspects of (large U) Kondo physics which are described well by a simpler frequency-independent truncation scheme are no longer captured by the 'higher-order' frequency-dependent approximation. In contrast, at small to intermediate U the results obtained by the more elaborate scheme agree better with NRG data. We suggest to parametrize the two-particle vertex not by three independent energy variables but by introducing three functions each of a single frequency. This considerably reduces the numerical effort to integrate the FRG flow equations.

Karrasch, C.; Hedden, R.; Peters, R.; Pruschke, Th; Schönhammer, K.; Meden, V.

2008-08-01

484

Health assessment for Anderson Development Company, Adrian, Michigan, Region 5. CERCLIS No. MID002931228. Final report  

SciTech Connect

The Anderson Development Company (ADC) site has been placed on the National Priorities List (NPL). From approximately 1968 to 1979 ADC manufactured 4,4'-methylene-bis(2-chloroaniline) (MBOCA), also known under the trademark names of MOCA and Curene 422. In 1978 the National Institute for Occupational Safety and Health recommended that MBOCA be regulated as a human carcinogen. Discharges of waste waters and air emissions from ADC during the production of MBOCA eventually caused contamination in company lagoons, sludges, and effluents; in municipal sewer influent, effluent, and sludges; in surface-water drains and the Raisin River; and in soil, street sweepings, and residences within a 1-mile radius of the plant. In 1979 and 1980, detectable levels of MBOCA were found in urine specimens collected from ADC and user-plant employees and members of their families. MBOCA may have been carried out of the manufacturing plant on the shoes and clothing of the employees and deposited in their residence. Detectable concentrations of MBOCA were also found in urine specimens of some children living near the site. Because the documented contamination created a continuing potential for environment and human exposure, comprehensive remedial measures were implemented during 1980 and 1981. The site is of potential public health concern because a risk to human health may exist from possible exposure to a hazardous substance at levels that may result in adverse health effects over time; human exposure to MBOCA has occurred/may be still occurring via contaminated soil and garden sources of food.

Not Available

1989-03-10

485

Neutral beam heating of a RFP plasma in MST J. Waksman, J. K. Anderson, M. D. Nornberg, E. Parke, J. A. Reusch et al.  

E-print Network

Neutral beam heating of a RFP plasma in MST J. Waksman, J. K. Anderson, M. D. Nornberg, E. Parke, J://pop.aip.org/about/rights_and_permissions #12;Neutral beam heating of a RFP plasma in MST J. Waksman,1 J. K. Anderson,1 M. D. Nornberg,1 E-field pinch (RFP). This heating is consistent with a 1D classical model which was developed. This 1D model

Wisconsin at Madison, University of

486

Extending single molecule fluorescence observation time by amplitude-modulated excitation  

PubMed Central

We present a hardware-based method that can improve single molecule fluorophore observation time by up to 1500% and super-localization by 47% for the experimental conditions used. The excitation was modulated using an acousto-optic modulator (AOM) synchronized to the data acquisition and inherent data conversion time of the detector. The observation time and precision in super-localization of four commonly used fluorophores were compared under modulated and traditional continuous excitation, including direct total internal reflectance excitation of Alexa 555 and Cy3, non-radiative Förster resonance energy transfer (FRET) excited Cy5, and direct epi-fluorescence wide field excitation of Rhodamine 6G. The proposed amplitude-modulated excitation does not perturb the chemical makeup of the system or sacrifice signal and is compatible with multiple types of fluorophores. Amplitude-modulated excitation has practical applications for any fluorescent study utilizing an instrumental setup with time-delayed detectors. PMID:24587894

Kisley, Lydia; Chang, Wei-Shun; Cooper, David; Mansur, Andrea P; Landes, Christy F

2014-01-01

487

Localization of Langmuir waves in a fluctuating plasma  

SciTech Connect

We have made preliminary observations of the spatial localization of an electron plasma wave in a fluctuating plasma. The effect is related to the general wave phenomenon known as Anderson localization which is applicable both quantum mechanically and classically. Our experiment consists of a multipole discharge plasma in which a launched ion-acoustic mode provides a density fluctuation. We have observed an increase in the damping of an additional launched electron plasma wave which follows the predictions of a Mathieu-type equation for the wave amplitude evolution.

Doveil, F.; Vosluisant, Y.; Tsunoda, S.I. (Laboratoire de Physique des Milieux Ionises, Ecole Polytechnique, F-91128, Palaiseau CEDEX (France) Equipe Turbulence Plasma, Institut Mediterraneen de Technologie, F-13451, Marseille CEDEX (France) General Atomics, P.O. Box 85608, San Diego, California 92186 (United States))

1992-10-05

488

Fusion excitation function revisited  

E-print Network

We report on a comprehensive systematics of fusion-evaporation and/or fusion-fission cross sections for a very large variety of systems over an energy range 4-155 A.MeV. Scaled by the reaction cross sections, fusion cross sections do not show a universal behavior valid for all systems although a high degree of correlation is present when data are ordered by the system mass asymmetry.For the rather light and close to mass-symmetric systems the main characteristics of the complete and incomplete fusion excitation functions can be precisely determined. Despite an evident lack of data above 15A.MeV for all heavy systems the available data suggests that geometrical effects could explain the persistence of incomplete fusion at incident energies as high as 155A.MeV.

Ph. Eudes; Z. Basrak; F. Sébille; V. de la Mota; G. Royer; M. Zori?

2012-09-07

489

Parity-dependent localization in N strongly coupled chains  

NASA Astrophysics Data System (ADS)

Anderson localization of wave functions at zero energy in quasi-one-dimensional (1D) systems of N disordered chains with interchain coupling t is examined. Localization becomes weaker than for the 1D disordered chain (t =0) when t is smaller than the longitudinal hopping t'=1, and localization becomes usually much stronger when t ?t'. This is not so for all N. We find "immunity" to strong localization for open (periodic) lateral boundary conditions when N is odd (a multiple of 4), with localization that is weaker than for t =0 and rather insensitive to t when t ?t'. The peculiar N dependence and a critical scaling with N are explained by a perturbative treatment in t'/t, and the correspondence to a weakly disordered effective chain is shown. Our results could be relevant for experimental studies of localization in photonic waveguide arrays.

Weinmann, Dietmar; Evangelou, S. N.

2014-10-01

490

Thermoelectric transport properties through a single-walled zig-zag carbon nanotube side coupled to a correlated quantum dot: Atomic approach for the finite U-impurity Anderson model  

NASA Astrophysics Data System (ADS)

We study the thermopower S, linear thermal conductance ?, linear electric conductance G and thermoelectric figure of merit Z properties of a single-walled zig-zag carbon nanotube side coupled to a correlated quantum dot (QD). We employ the recently developed U-finite atomic approach for the Single Impurity Anderson model (SIAM). The quantum dot is linked to the localized states in the model, considering a finite Coulombic repulsion U, and the conduction band in the model is associated with the single walled zig-zag metallic carbon nanotube (n=3), and is described by a tight-binding approximation in order to obtain Green's function of the nanotube. The thermoelectric transport coefficients were obtained using the Keldysh non-equilibrium Green's function technique with the Onsager relation in the linear regime automatically satisfied. Results indicate that this system can be employed in possible thermoelectric device applications at low temperatures when strong charge fluctuations are present in the QD.

Ramos, Edwin; Franco, Roberto; Silva-Valencia, Jereson; Figueira, Marcos Sergio

2014-12-01

491