Radiation Therapy for Neovascular Age-related Macular Degeneration
Kishan, Amar U.; Modjtahedi, Bobeck S.; Morse, Lawrence S.; Lee, Percy
2013-03-01
In the enormity of the public health burden imposed by age-related macular degeneration (ARMD), much effort has been directed toward identifying effective and efficient treatments. Currently, anti-vascular endothelial growth factor (VEGF) injections have demonstrated considerably efficacy in treating neovascular ARMD, but patients require frequent treatment to fully benefit. Here, we review the rationale and evidence for radiation therapy of ARMD. The results of early photon external beam radiation therapy are included to provide a framework for the sequential discussion of evidence for the usage of stereotactic radiation therapy, proton therapy, and brachytherapy. The evidence suggests that these 3 modern modalities can provide a dose-dependent benefit in the treatment of ARMD. Most importantly, preliminary data suggest that all 3 can be used in conjunction with anti-VEGF therapeutics, thereby reducing the frequency of anti-VEGF injections required to maintain visual acuity.
assess the risk for the development of Age-related Mac- ular Degeneration (AMD). Our system incorporates is a hall- mark of AMD, and magnification/multiplication of drusen in- dicates increased risk of eventual are labor-intensive, difficult to reproduce, and may lose important information. Automated drusen detection
Baker, Chris I.
Recent work has shown that foveal cortex, deprived of its normal bottom-up input as a result of macular degeneration (MD), begins responding to stimuli presented to a peripheral retinal location. However, these studies ...
Investigating a C1QTNF5 mutation associated with macular degeneration
Slingsby, Fern
2009-01-01
C1QTNF5 is a 25kDa short chain collagen of unknown function which is mutated in late-onset retinal macular degeneration (L-ORMD). L-ORMD is an autosomal dominant disease characterised by sub-retinal pigment epithelial ...
2013-01-01
may change the retinal bioenergetics and play a significantmay change retinal bioenergetics and energy production
2013-01-01
Oxygen/Nitrogen Species (ROS/RNS) Assay The H haplogroup andexposed to the reagent and ROS/RNS production measured withfunction (production of ROS/RNS, ATP, and lactate) were
2013-01-01
energy biogenesis are encoded by nuclear DNA and imported into the mitochondria [4,20]. The contribution
Yip, Jennifer L. Y.; Khawaja, Anthony P.; Chan, Michelle P. Y.; Broadway, David C.; Peto, Tunde; Tufail, Adnan; Luben, Robert; Hayat, Shabina; Bhaniani, Amit; Wareham, Nicholas J.; Khaw, Kay-Tee; Foster, Paul J.
2015-01-01
have been reported previously.[2727,2828] 62 [2929] The baseline study cohort had lower smoking rates compared to national British population 63 samples ,[2727] but were otherwise comparable with regard to anthropometry measures and blood 64...
Fafowora, Oluwatoyin Folasade
2015-01-01
of Avastin and Lucentis: off-label versus goldstandard.but Michels showed that off-label intravitreal use producedevents. Genentech nvAMD off-label 149 KDa full-length,
Brief Communications Reorganization of Visual Processing in Macular
Peli, Eli
Brief Communications Reorganization of Visual Processing in Macular Degeneration Is Not Specific to the "Preferred Retinal Locus" Daniel D. Dilks,1 Chris I. Baker,2 Eli Peli,3 and Nancy Kanwisher1 1Mc of macular degeneration (MD), begins responding to stimuli presented to a peripheral retinal location
DeLucia, Evan H.
Hydraulic limitation not declining nitrogen availability causes the age-related photosynthetic capacity and thus decreases GPP with increasing age; and (2) hydraulic limitations increasingly induce conservative with age. We conclude that hydraulic limitation increasingly limits the photosyn- thetic rates
Aggregation Equation with Degenerate Diffusion
Yao, Yao
2012-01-01
for Patlak-Keller-Segel Equation with Degenerate Dif-for the aggregation equation with degenerate di?usion,3 An Aggregation Equation with Di?usion in the Periodic
Organization and differentiation of stem cells on delivery scaffold for retinal tissue engineering
Ko, Chi Wan
2011-01-01
Retinal degenerative diseases, including retinitis pigmentosa and age-related macular degeneration, affect more than ten million people in the US. Currently, there is no proven visually beneficial treatment for these types ...
Ritchie, Robert
2005-01-01
Biomaterials 26 (2005) 33633376 Age-related transparent root dentin: mineral concentration that indicate elastic asym- metry would be determined not by the orientation of the ARTICLE IN PRESS www.elsevier.com/locate/biomaterials 0142-9612/$ - see front matter r 2004 Elsevier Ltd. All rights reserved. doi:10.1016/j.biomaterials
macular pigment optical density. Methods. The instrument is small, uses light emitting diodes as light
Retinal Remodeling Triggered by Photoreceptor Degenerations
Marc, Robert E.
retina drive signal-processing circuitries of the neural retina. Most retinal degenerationsRetinal Remodeling Triggered by Photoreceptor Degenerations BRYAN W. JONES,1* CARL B. WATT,1 JEANNE retina is largely resistant to this sensory deafferentation. New evidence from fast retinal degenerations
Low-Dose, Ionizing Radiation and Age-Related Changes in Skeletal Microarchitecture
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Alwood, Joshua S.; Kumar, Akhilesh; Tran, Luan H.; Wang, Angela; Limoli, Charles L.; Globus, Ruth K.
2012-01-01
Osteoporosis can profoundly affect the aged as a consequence of progressive bone loss; high-dose ionizing radiation can cause similar changes, although less is known about lower doses (?100?cGy). We hypothesized that exposure to relatively low doses of gamma radiation accelerates structural changes characteristic of skeletal aging. Mice (C57BL/6J-10?wk old, male) were irradiated (total body; 0-sham, 1, 10 or 100?cGy 137 Cs) and tissues harvested on the day of irradiation, 1 or 4?months later. Microcomputed tomography was used to quantify microarchitecture of high turnover, cancellous bone. Irradiation at 100?cGy caused transient microarchitectural changes over one month that were only evidentmore »at longer times in controls (4 months). Ex vivo bone cell differentiation from the marrow was unaffected by gamma radiation. In conclusion, acute ionizing gamma irradiation at 100?cGy (but not at 1?cGy or 10?cGy) exacerbated microarchitectural changes normally found during progressive, postpubertal aging prior to the onset of age-related osteoporosis. « less
Saltzman, Wendy
in the heart A. M. BRONIKOWSKI,1,7 P. A. CARTER,2 T. J. MORGAN,2 T. GARLAND, JR.,3 N. UNG,1 T. D. PUGH,4 R voluntary exercise in the mouse prevents age-related alterations in gene expression in the heart. Physiol changes that normally occur in the aging heart. Male mice (Mus domesticus) were sampled from the 16th
Mitochondrial Transport and Function in Axon Degeneration
O'Donnell, Kelley
2013-01-01
OF CALIFORNIA Los Angeles Mitochondrial Transport andTransport and Function in Axon Degeneration by Kelley O’Donnell Doctor of Philosophy in Neuroscience University of California,
Mitochondrial Transport and Function in Axon Degeneration
O'Donnell, Kelley
2013-01-01
Zhu and Sheng, 2011; Marinkovic et al. , 2012; Millecampswith axon degeneration (Marinkovic et al. , 2012), andsubstantia nigra. Ann Neurol Marinkovic P, Reuter MS, Brill
Degenerate doping of metallic anodes
Friesen, Cody A; Zeller, Robert A; Johnson, Paul B; Switzer, Elise E
2015-05-12
Embodiments of the invention relate to an electrochemical cell comprising: (i) a fuel electrode comprising a metal fuel, (ii) a positive electrode, (iii) an ionically conductive medium, and (iv) a dopant; the electrodes being operable in a discharge mode wherein the metal fuel is oxidized at the fuel electrode and the dopant increases the conductivity of the metal fuel oxidation product. In an embodiment, the oxidation product comprises an oxide of the metal fuel which is doped degenerately. In an embodiment, the positive electrode is an air electrode that absorbs gaseous oxygen, wherein during discharge mode, oxygen is reduced at the air electrode. Embodiments of the invention also relate to methods of producing an electrode comprising a metal and a doped metal oxidation product.
A Monte Carlo algorithm for degenerate plasmas
Turrell, A.E. Sherlock, M.; Rose, S.J.
2013-09-15
A procedure for performing Monte Carlo calculations of plasmas with an arbitrary level of degeneracy is outlined. It has possible applications in inertial confinement fusion and astrophysics. Degenerate particles are initialised according to the Fermi–Dirac distribution function, and scattering is via a Pauli blocked binary collision approximation. The algorithm is tested against degenerate electron–ion equilibration, and the degenerate resistivity transport coefficient from unmagnetised first order transport theory. The code is applied to the cold fuel shell and alpha particle equilibration problem of inertial confinement fusion.
Age-related changes in the plasticity and toughness of human cortical bone at multiple length-scales
Zimmermann, Elizabeth A.; Schaible, Eric; Bale, Hrishikesh; Barth, Holly D.; Tang, Simon Y.; Reichert, Peter; Busse, Bjoern; Alliston, Tamara; Ager III, Joel W.; Ritchie, Robert O.
2011-08-10
The structure of human cortical bone evolves over multiple length-scales from its basic constituents of collagen and hydroxyapatite at the nanoscale to osteonal structures at nearmillimeter dimensions, which all provide the basis for its mechanical properties. To resist fracture, bone’s toughness is derived intrinsically through plasticity (e.g., fibrillar sliding) at structural-scales typically below a micron and extrinsically (i.e., during crack growth) through mechanisms (e.g., crack deflection/bridging) generated at larger structural-scales. Biological factors such as aging lead to a markedly increased fracture risk, which is often associated with an age-related loss in bone mass (bone quantity). However, we find that age-related structural changes can significantly degrade the fracture resistance (bone quality) over multiple lengthscales. Using in situ small-/wide-angle x-ray scattering/diffraction to characterize sub-micron structural changes and synchrotron x-ray computed tomography and in situ fracture-toughness measurements in the scanning electron microscope to characterize effects at micron-scales, we show how these age-related structural changes at differing size-scales degrade both the intrinsic and extrinsic toughness of bone. Specifically, we attribute the loss in toughness to increased non-enzymatic collagen cross-linking which suppresses plasticity at nanoscale dimensions and to an increased osteonal density which limits the potency of crack-bridging mechanisms at micron-scales. The link between these processes is that the increased stiffness of the cross-linked collagen requires energy to be absorbed by “plastic” deformation at higher structural levels, which occurs by the process of microcracking.
EXCEPTIONAL BUNDLES ASSOCIATED TO DEGENERATIONS OF SURFACES
Hacking, Paul
EXCEPTIONAL BUNDLES ASSOCIATED TO DEGENERATIONS OF SURFACES PAUL HACKING 1. Introduction In 1981 J HACKING F deforms in a unique way to a family of exceptional bundles on the fibers of Y/(0 S). Theorem 1
Central retinal thickness is positively correlated with macular pigment optical density
of healthy subjects. We report that macular pigment optical density (MPOD) has a significant and positive of the observed relationship (rw0.30) was independent of the technique used to measure MPOD, whether
2011-01-01
A recipe for accelerated cellular aging? Hormones (Athens).physbeh.2011.11.016. Does cellular aging relate to patternsAllostatic load; Telomere; Cellular aging; Stress; HPA axis
Balatsoukas, Ioannis; Kourkoumelis, Nikolaos; Tzaphlidou, Margaret [Department of Medical Physics, Medical School, University of Ioannina, Ioannina 45110 (Greece)
2010-10-15
The Ca/P ratio of normal cortical and trabecular rat bone was measured by Auger electron spectroscopy (AES). Semiquantitative analysis was carried out using ratio techniques to draw conclusions on how age, sex and bone site affect the relative composition of calcium and phosphorus. Results show that Ca/P ratio is not sex dependent; quite the opposite, bone sites exhibit variations in elemental stoichiometry where femoral sections demonstrate higher Ca/P ratio than rear and front tibias. Age-related changes are more distinct for cortical bone in comparison with the trabecular bone. The latter's Ca/P ratio remains unaffected from all the parameters under study. This study confirms that AES is able to successfully quantify bone mineral main elements when certain critical points, related to the experimental conditions, are addressed effectively.
Transmission eigenvalues for degenerate and singular cases
Sylvester, John
Transmission eigenvalues for degenerate and singular cases Valery Serov and John Sylvester Abstract We prove the existence of infinitely many real interior transmission eigenvalues for positive transmission eigenvalues. We will prove that positive values of the square of the wavenumber k2 for which
Adaptive Evolution of Eye Degeneration in the Mexican Blind Cavefish
Monteiro, Antónia
Adaptive Evolution of Eye Degeneration in the Mexican Blind Cavefish W. R. JEFFERY Department degeneration in cave-adapted animals have not been resolved. Opposing hypotheses invoking neural mutation-dwelling forms (cavefish), which shed new light on this problem. The manner of eye development and degeneration
Breitling, Rainer
, including Parkinson's disease, polyglutamine expansion diseases and Alzheimer's disease, are associated used to model these diseases and high throughput genetic screens using these models have led-analysis #12;3 Introduction Several age-related neurodegenerative diseases, including Parkinson's disease
Can Neutrinos be Degenerate in Mass?
John Ellis; Smaragda Lola
1999-04-13
We reconsider the possibility that the masses of the three light neutrinos of the Standard Model might be almost degenerate and close to the present upper limits from Tritium beta decay and cosmology. In such a scenario, the cancellations required by the latest upper limit on neutrinoless double-beta decay enforce near-maximal mixing that may be compatible only with the vacuum-oscillation scenario for solar neutrinos. We argue that the mixing angles yielded by degenerate neutrino mass-matrix textures are not in general stable under small perturbations. We evaluate within the MSSM the generation-dependent one-loop renormalization of neutrino mass-matrix textures that yielded degenerate masses and large mixing at the tree level. We find that m_{nu_e} > m_{nu_mu} > m_{nu_tau} after renormalization, excluding MSW effects on solar neutrinos. We verify that bimaximal mixing is not stable, and show that the renormalized masses and mixing angles are not compatible with all the experimental constraints, even for tanbeta as low as unity. These results hold whether the neutrino masses are generated by a see-saw mechanism with heavy neutrinos weighing approx. 10^{13} GeV or by non-renormalizable interactions at a scale approx. 10^5 GeV. We also comment on the corresponding renormalization effects in the minimal Standard Model, in which m_{nu_e} < m_{nu_mu} < m_{nu_tau}. Although a solar MSW effect is now possible, the perturbed neutrino masses and mixings are still not compatible with atmospheric- and solar-neutrino data.
Variational functions in degenerate open quantum systems
Jakob, Matthias; Stenholm, Stig [Laser Physics and Quantum Optics, Royal Institute of Technology (KTH), Alba Nova, Roslagstullsbacken 21, SE-10691 Stockholm (Sweden)
2004-04-01
We have derived a Lyapunov functional for a degenerate open atomic system. This functional develops monotonically towards its stationary state. The open system is described by a Lindblad-type master equation. For the construction of the variational functional it is necessary that the Lindblad operator can be diagonalized. Since the generator of motion is non-Hermitian, diagonalization is, in general, only possible if the eigenvalues are nondegenerate. In this paper, we propose that in a physical system the biorthogonal eigenbasis of the Lindblad operator remains complete even when degeneracy is present. Thus diagonalization of the Lindblad operator, and consequently the construction of the variational functional, is still possible. We discuss the reasons and illustrate the theory of the variational functional for a driven {lambda}-type three-level atom with degenerate ground state. The degeneracy has interesting effects on the variational functional in the steady state with respect to its interpretation as an entropic quantity. In case of the driven three-level atom, the dark state turns out to be an isentropic state.
Emotion Regulation Deficits in Frontotemporal Lobar Degeneration and Alzheimer's Disease
Levenson, Robert W.
Emotion Regulation Deficits in Frontotemporal Lobar Degeneration and Alzheimer's Disease Madeleine instructed and spontaneous emotion regulation in patients with frontotemporal lobar degeneration (FTLD, N 32) unwarned without instructions to down-regulate, (b) warned without instructions to down-regulate, and (c
A NOTE ON VISCOUS SPLITTING OF DEGENERATE CONVECTIONDIFFUSION EQUATIONS
. It thus provides a suitable ``L 1 type'' framework for analyzing numerical schemes for convectiondiffusionA NOTE ON VISCOUS SPLITTING OF DEGENERATE CONVECTIONDIFFUSION EQUATIONS Steinar Evje, Kenneth possibly strongly degenerate convectiondiffusion problems. Since we allow the equations to be strongly
Single-Degenerate Type Ia Supernovae Are Preferentially Overluminous
Fisher, Robert
2015-01-01
Recent observational and theoretical progress has favored merging and helium-accreting sub-Chandrasekhar mass white dwarfs in the double-degenerate and the double-detonation channels, respectively, as the most promising progenitors of normal Type Ia supernovae (SNe Ia). Thus the fate of rapidly-accreting Chandrasekhar mass white dwarfs in the single-degenerate channel remains more mysterious then ever. In this paper, we clarify the nature of ignition in Chandrasekhar-mass single-degenerate SNe Ia by analytically deriving the existence of a characteristic length scale which establishes a transition from central ignitions to buoyancy-driven ignitions. Using this criterion, combined with data from three-dimensional simulations of convection and ignition, we demonstrate that the overwhelming majority of ignition events within Chandrasekhar-mass white dwarfs in the single-degenerate channel are buoyancy-driven, and consequently lack a vigorous deflagration phase. We thus infer that single-degenerate SNe Ia are gen...
Crystallization and collapse in relativistically degenerate matter
Akbari-Moghanjoughi, M.
2013-04-15
In this paper, it is shown that a mass density limit exists beyond which the relativistically degenerate matter would crystallize. The mass density limit, found here, is quite analogous to the mass limit predicted by Chandrasekhar for a type of compact stars called white dwarfs (M{sub Ch} Asymptotically-Equal-To 1.43 Solar Mass). In this study, the old problem of white dwarf core collapse, which has been previously investigated by Chandrasekhar using hydrostatic stability criteria, is revisited in the framework of the quantum hydrodynamics model by inspection of the charge screening at atomic scales in the relativistic degeneracy plasma regime taking into account the relativistic Fermi-Dirac statistics and electron interaction features such as the quantum statistical pressure, Coulomb attraction, electron exchange-correlation, and quantum recoil effects. It is revealed that the existence of ion correlation and crystallization of matter in the relativistically degenerate plasma puts a critical mass density limit on white dwarf core region. It is shown that a white dwarf star with a core mass density beyond this critical limit can undergo the spontaneous core collapse (SCC). The SCC phenomenon, which is dominantly caused by the electron quantum recoil effect (interference and localization of the electron wave function), leads to a new exotic state of matter. In such exotic state, the relativistic electron degeneracy can lead the white dwarf crystallized core to undergo the nuclear fusion and an ultimate supernova by means of the volume reduction (due to the enhanced compressibility) and huge energy release (due to the increase in cohesive energy), under the stars huge inward gravitational pressure. Moreover, it is found that the SCC phenomenon is significantly affected by the core composition (it is more probable for heavier plasmas). The critical mass density found here is consistent with the values calculated for core density of typical white dwarf stars.
Cheng, Eugenia
so we take the full sub-2-category of this whose 0- cells are the degenerate categories. Monoids k. Now, such an n-category only has non-trivial cells in the top n-k dimensions, so we can perform a "dimension shift" and regard this as an (n - k)-category: the old k-cells become the new 0-cells, the old (k
A R T I C L E Induction of tumor angiogenesis by Slit-Robo signaling and
Tian, Weidong
in axon guidance (Wang et al., 1999; macular degeneration, neovascular glaucoma, psoriasis, rheu- Brose et
Electromagnetic Solitons in Degenerate Relativistic Electron-Positron Plasma
Berezhiani, V I; Tsintsadze, N L
2014-01-01
The existence of soliton-like electromagnetic (EM) distributions in a fully degenerate electron-positron plasma is studied applying relativistic hydrodynamic and Maxwell equations. For circularly polarized wave it is found that the soliton solutions exist both in relativistic as well as nonrelativistic degenerate plasmas. Plasma density in the region of soliton pulse localization is reduced considerably. The possibility of plasma cavitation is also shown.
Distinct optical properties of relativistically degenerate matter
Akbari-Moghanjoughi, M.
2014-06-15
In this paper, we use the collisional quantum magnetohydrodynamic (CQMHD) model to derive the transverse dielectric function of a relativistically degenerate electron fluid and investigate various optical parameters, such as the complex refractive index, the reflection and absorption coefficients, the skin-depth and optical conductivity. In this model we take into accounts effects of many parameters such as the atomic-number of the constituent ions, the electron exchange, electron diffraction effect and the electron-ion collisions. Study of the optical parameters in the solid-density, the warm-dense-matter, the big-planetary core, and the compact star number-density regimes reveals that there are distinct differences between optical characteristics of the latter and the former cases due to the fundamental effects of the relativistic degeneracy and other quantum mechanisms. It is found that in the relativistic degeneracy plasma regime, such as found in white-dwarfs and neutron star crusts, matter possess a much sharper and well-defined step-like reflection edge beyond the x-ray electromagnetic spectrum, including some part of gamma-ray frequencies. It is also remarked that the magnetic field intensity only significantly affects the plasma reflectivity in the lower number-density regime, rather than the high density limit. Current investigation confirms the profound effect of relativistic degeneracy on optical characteristics of matter and can provide an important plasma diagnostic tool for studying the physical processes within the wide scope of quantum plasma regimes be it the solid-density, inertial-confined, or astrophysical compact stars.
Linear harmonic oscillator in spaces with degenerate metrics
N. A. Gromov
2006-03-02
With the help of contraction method we study the harmonic oscillator in spaces with degenerate metrics, namely, on Galilei plane and in the flat 3D Cayley-Klein spaces $R_3(j_2,j_3).$ It is shown that the inner degrees of freedom are appeared which physical dimensions are different from the dimension of the space.
ON THE GENUS OF REDUCIBLE SURFACES AND DEGENERATIONS OF SURFACES
Flamini, Flaminio
(GX, C) + v i=1 pg(Xi) + dim(coker(X)). In particular, (1.1) shows that p is a topological invariant of a flat degeneration : X of surfaces, where is the spectrum of a DVR (or equivalently the complex unit
Exact null controllability of degenerate evolution equations with scalar control
Fedorov, Vladimir E; Shklyar, Benzion
2012-12-31
Necessary and sufficient conditions for the exact null controllability of a degenerate linear evolution equation with scalar control are obtained. These general results are used to examine the exact null controllability of the Dzektser equation in the theory of seepage. Bibliography: 13 titles.
A New Merging Double Degenerate Binary in the Solar Neighborhood
Debes, John H; Tremblay, Pier-Emmanuel; López-Morales, Mercedes; Anglada-Escudé, Guillem; Napiwotzki, Ralf; Osip, David; Weinberger, Alycia
2015-01-01
Characterizing the local space density of double degenerate binary systems is a complementary approach to broad sky surveys of double degenerates to determine the expected rates of white dwarf binary mergers, in particular those that may evolve into other observable phenomena such as extreme helium stars, Am CVn systems, and supernovae Ia. However, there have been few such systems detected in local space. We report here the discovery that WD 1242$-$105, a nearby bright WD, is a double-line spectroscopic binary consisting of two degenerate DA white dwarfs of similar mass and temperature, despite it previously having been spectroscopically characterized as a single degenerate. Follow-up photometry, spectroscopy, and trigonometric parallax have been obtained in an effort to determine the fundamental parameters of each component of this system. The binary has a mass ratio of 0.7 and a trigonometric parallax of 25.5 mas, placing it at a distance of 39 pc. The system's total mass is 0.95 M$_\\odot$ and has an orbita...
NON-LINEAR DEGENERATE INTEGRO-PARTIAL DIFFERENTIAL EVOLUTION EQUATIONS RELATED TO
Karlsen, Kenneth Hvistendahl
-linear degenerate parabolic integro-partial differential equations with a given terminal condition uT: 2>tu þ Hðx; tNON-LINEAR DEGENERATE INTEGRO-PARTIAL DIFFERENTIAL EVOLUTION EQUATIONS RELATED TO GEOMETRIC LE´ VY for unbounded semicontinuous viscosity sub- and supersolutions of non-linear degenerate parabolic integro-partial
Exact nonlinear excitations in double-degenerate plasmas
Akbari-Moghanjoughi, M.
2012-06-15
In this work, we use the conventional hydrodynamics formalism and incorporate the Chew-Goldberger-Low double-adiabatic theory to evaluate the nonlinear electrostatic ion excitations in double-degenerate (electron spin-orbit degenerate) magnetized quantum plasmas. Based on the Sagdeev pseudopotential method, an exact general pseudopotential is calculated which leads to the allowed Mach-number range criteria for such localized density structures in an anisotropic magnetized plasma. We employ the criteria on the Mach-number range for diverse magnetized quantum plasma with different equations of state. It is remarked that various plasma fractional parameters such as the system dimensionality, ion-temperature, relativistic-degeneracy, Zeeman-energy, and plasma composition are involved in the stability of an obliquely propagating nonlinear ion-acoustic wave in a double-degenerate quantum plasma. Current study is most appropriate for nonlinear wave analysis in dense astrophysical magnetized plasma environments such as white-dwarfs and neutron-star crusts where the strong magnetic fields can be present.
Electrostatic rogue-waves in relativistically degenerate plasmas
Akbari-Moghanjoughi, M.
2014-10-15
In this paper, we investigate the modulational instability and the possibility of electrostatic rogue-wave propagations in a completely degenerate plasma with arbitrary degree of degeneracy, i.e., relativistically degenerate plasma, ranging from solid density to the astrophysical compact stars. The hydrodynamic approach along with the perturbation method is used to reduce the governing equations to the nonlinear Schrödinger equation from which the modulational instability, the growth rate of envelope excitations and the occurrence of rogue as well as super-rogue waves in the plasma, is evaluated. It is observed that the modulational instability in a fully degenerate plasma can be quite sensitive to the plasma number-density and the wavenumber of envelop excitations. It is further revealed that the relativistically degeneracy plasmas (R{sub 0}?>?1) are almost always modulationally unstable. It is found, however, that the highly energetic sharply localized electrostatic rogue as well as super-rogue waves can exist in the astrophysical compact objects like white dwarfs and neutron star crusts. The later may provide a link to understand many physical processes in such stars and it may lead us to the origin of the random-localized intense short gamma-ray bursts, which “appear from nowhere and disappear without a trace” quite similar to oceanic rogue structures.
Electron thermal conductivity owing to collisions between degenerate electrons
P. S. Shternin; D. G. Yakovlev
2006-08-17
We calculate the thermal conductivity of electrons produced by electron-electron Coulomb scattering in a strongly degenerate electron gas taking into account the Landau damping of transverse plasmons. The Landau damping strongly reduces this conductivity in the domain of ultrarelativistic electrons at temperatures below the electron plasma temperature. In the inner crust of a neutron star at temperatures T electron conductivity due to electron-ion (electron-phonon) scattering and becomes competitive with the the electron conductivity due to scattering of electrons by impurity ions.
On degenerate sigma-functions of genus two
Julia Bernatska; Dmitry Leykin
2015-09-04
We obtain explicit expressions for genus 2 degenerate sigma-function in terms of genus $1$ sigma-function and elementary functions as solutions of a system of linear PDEs satisfied by the sigma-function. By way of application we derive a solution for a class of generalized Jacobi inversion problems on elliptic curves, a family of Schr\\"{o}dinger-type operators on a line with common spectrum consisting of a point and two segments, explicit construction of a field of three-periodic meromorphic functions. Generators of rank $3$ lattice in $\\Complex^2$ are given explicitly.
Dwarf spheroidal galaxies as degenerate gas of free fermions
Domcke, Valerie; Urbano, Alfredo E-mail: alfredo.urbano@sissa.it
2015-01-01
In this paper we analyze a simple scenario in which Dark Matter (DM) consists of free fermions with mass m{sub f}. We assume that on galactic scales these fermions are capable of forming a degenerate Fermi gas, in which stability against gravitational collapse is ensured by the Pauli exclusion principle. The mass density of the resulting con figuration is governed by a non-relativistic Lane-Emden equation, thus leading to a universal cored profile that depends only on one free parameter in addition to m{sub f}. After reviewing the basic formalism, we test this scenario against experimental data describing the velocity dispersion of the eight classical dwarf spheroidal galaxies of the Milky Way. We find that, despite its extreme simplicity, the model exhibits a good fit to the data and realistic predictions for the size of DM halos providing that m{sub f}? 200 eV. Furthermore, we show that in this setup larger galaxies correspond to the non-degenerate limit of the gas. We propose a concrete realization of this model in which DM is produced non-thermally via inflaton decay. We show that imposing the correct relic abundance and the bound on the free-streaming length constrains the inflation model in terms of inflaton mass, its branching ratio into DM and the reheating temperature.
Electron thermal conductivity owing to collisions between degenerate electrons P. S. Shternin and D of electrons produced by electron-electron Coulomb scattering in a strongly degenerate electron gas taking in the domain of ultrarelativistic electrons at temperatures below the electron plasma temperature. In the inner
A STRONGLY DEGENERATE CONVECTION-DIFFUSION PROBLEM MODELING CENTRIFUGATION OF FLOCCULATED of BV entropy solutions of a strongly degenerate convection-di#11;usion problem modeling centrifugation- boundary value problem numerically, i.e., to simulate the centrifugation process. 1. Introduction We
Degenerate U- and V -statistics under ergodicity: Asymptotics, bootstrap and applications in statistics Anne Leucht Universit¨at Hamburg Fachbereich Mathematik, SPST Bundesstraße 55 D-20146 Hamburg.neumann@uni-jena.de Abstract We derive the asymptotic distributions of degenerate U- and V -statistics of stationary
Fluctuations and State Preparation in Quantum Degenerate Gases of Sodium and Lithium
Fluctuations and State Preparation in Quantum Degenerate Gases of Sodium and Lithium by Edward Su and State Preparation in Quantum Degenerate Gases of Sodium and Lithium by Edward Su Submitted- periments with sodium and lithium in optical lattices. We describe progress towards the implementation
Harmonic entanglement in a degenerate parametric down conversion
Sintayehu Tesfa
2007-07-25
We study the harmonic entanglement and squeezing in a two-mode radiation produced in a degenerate parametric down conversion process coupled to a two-mode vacuum reservoir employing the linearization procedure. It is found that there is a quadrature entanglement between the harmonically related fundamental and second-harmonic modes and the superimposed radiation exhibits a significant two-mode squeezing. The entanglement exits even when there is no two-mode squeezing, since the correlation leading to these phenomena are essentially different. In addition, the more the external coherent light is down converted, the more stronger the entanglement and mean photon number of the two-mode radiation would be which is not generally true for squeezing.
WORK PROJECT REPORT Search for degenerate Higgs bosons
Heikkilae, Jaana Kristiina
2013-01-01
Degenerate Higgs bosons have been searched as a summer student project. The goal was to implement an algorithm which would help to understand if there could be two Higgs bosons with very similar masses from the matrix of measured signal strengths $(\\sigma\\cdot B)_\\mathrm{meas.}/(\\sigma\\cdot B)_\\mathrm{SM}$ in different final states. The statistical compatibility of the observed data with a matrix of rank 1 has been evaluated. Using CMS data from the $\\gamma\\gamma$ and $W^{+}W^{-}$ decay channels, a result compatible with a single Higgs boson at the level of 38% is obtained. A generalization of the algorithm to allow using all available data in the 5x4 signal strength matrix is also presented.
Dual-pumped degenerate Kerr oscillator in a silicon nitride microresonator
Okawachi, Yoshitomo; Luke, Kevin; Carvalho, Daniel O; Ramelow, Sven; Farsi, Alessandro; Lipson, Michal; Gaeta, Alexander L
2015-01-01
We demonstrate a degenerate parametric oscillator in a silicon-nitride microresonator. We use two frequency-detuned pump waves to perform parametric four-wave mixing and operate in the normal group-velocity dispersion regime to produce signal and idler fields that are frequency degenerate. Our theoretical modeling shows that this regime enables generation of bimodal phase states, analogous to the \\c{hi}(2)-based degenerate OPO. Our system offers potential for realization of CMOS-chip-based coherent optical computing and an all-optical quantum random number generator.
Heavy-fermion instability in double-degenerate plasmas
Akbari-Moghanjoughi, M.
2012-07-15
In this work, we study the propagations of normal frequency modes for quantum hydrodynamic waves in the linear limit and introduce a new kind of instability in a double-degenerate plasma. Three different regimes, namely, low, intermediate, and high magnetic field strengths are considered which span the applicability of the work to a wide variety of environments. Distinct behavior is observed for different regimes, for instance, in the laboratory-scale field regime no frequency-mode instability occurs unlike those of intermediate and high magnetic-field strength regimes. It is also found that the instability of this kind is due to the heavy-fermions which appear below a critical effective-mass parameter ({mu}{sub cr}={radical}(3)) and that the responses of the two (lower and upper frequency) modes to fractional effective-mass change in different effective-mass parameter ranges (below and above the critical value) are quite opposite to each other. It is shown that the heavy-fermion instability due to extremely high magnetic field such as that encountered for a neutron-star crust can lead to confinement of stable propagations in both lower and upper frequency modes to the magnetic poles. Current study can have important implications for linear wave dynamics in both laboratory and astrophysical environments possessing high magnetic fields.
Wong, Benjamin L.
2009-01-01
articular cartilage boundary lubricant. J Orthop Res 19:671-of loading time and lubricant on the friction of articularStrain Maps: Effects of Lubricant and Degeneration. 47
Temperature jump in degenerate quantum gases in the presence of a Bose - Einstein condensate
A. V. Latyshev; A. A. Yushkanov
2010-01-04
We construct a kinetic equation modeling the behavior of degenerate quantum Bose gases whose collision rate depends on the momentum of elementary excitations. We consider the case where the phonon component is the decisive factor in the elementary excitations. We analytically solve the half-space boundary value problem of the temperature jump at the boundary of the degenerate Bose gas in the presence of a Bose -- Einstein condensate.
Universal dynamics of a degenerate unitary Bose gas
Philip Makotyn; Catherine E. Klauss; David L. Goldberger; Eric. A. Cornell; Deborah S. Jin
2013-08-16
Understanding the rich behavior that emerges from systems of interacting quantum particles, such as electrons in materials, nucleons in nuclei or neutron stars, the quark-gluon plasma, and superfluid liquid helium, requires investigation of systems that are clean, accessible, and have tunable parameters. Ultracold quantum gases offer tremendous promise for this application largely due to an unprecedented control over interactions. Specifically, $a$, the two-body scattering length that characterizes the interaction strength, can be tuned to any value. This offers prospects for experimental access to regimes where the behavior is not well understood because interactions are strong, atom-atom correlations are important, mean-field theory is inadequate, and equilibrium may not be reached or perhaps does not even exist. Of particular interest is the unitary gas, where $a$ is infinite, and where many aspects of the system are universal in that they depend only on the particle density and quantum statistics. While the unitary Fermi gas has been the subject of intense experimental and theoretical investigation, the degenerate unitary Bose gas has generally been deemed experimentally inaccessible because of three-body loss rates that increase dramatically with increasing $a$. Here, we investigate dynamics of a unitary Bose gas for timescales that are short compared to the loss. We find that the momentum distribution of the unitary Bose gas evolves on timescales fast compared to losses, and that both the timescale for this evolution and the limiting shape of the momentum distribution are consistent with universal scaling with density. This work demonstrates that a unitary Bose gas can be created and probed dynamically, and thus opens the door for further exploration of this novel strongly interacting quantum liquid.
Gene- or region-based association study via kernel principal component analysis
Gao, Qingsong; He, Yungang; Yuan, Zhongshang; Zhao, Jinghua; Zhang, Bingbing; Xue, Fuzhong
2011-08-26
RJ, Zeiss C, Chew EY, Tsai JY, Sackler RS, Haynes C, Henning AK, SanGiovanni JP, Mane SM, Mayne ST, et al: Complement factor H polymorphism in age-related macular degeneration. Science 2005, 308(5720):385-389. 2. Maraganore DM, de Andrade M, Lesnick... information processing systems 1999, 11(1):536-542. 28. Schlkopf B, Smola A, Müller K: Kernel principal component analysis. Artificial Neural Networks¡ªICANN’97 1997, 583-588. 29. Scholkopf B, Smola A, Muller KR: Nonlinear component analysis as a kernel...
Hamilton-Jacobi Theory for Degenerate Lagrangian Systems with Holonomic and Nonholonomic Constraints
Melvin Leok; Tomoki Ohsawa; Diana Sosa
2012-09-12
We extend Hamilton-Jacobi theory to Lagrange-Dirac (or implicit Lagrangian) systems, a generalized formulation of Lagrangian mechanics that can incorporate degenerate Lagrangians as well as holonomic and nonholonomic constraints. We refer to the generalized Hamilton-Jacobi equation as the Dirac-Hamilton-Jacobi equation. For non-degenerate Lagrangian systems with nonholonomic constraints, the theory specializes to the recently developed nonholonomic Hamilton-Jacobi theory. We are particularly interested in applications to a certain class of degenerate nonholonomic Lagrangian systems with symmetries, which we refer to as weakly degenerate Chaplygin systems, that arise as simplified models of nonholonomic mechanical systems; these systems are shown to reduce to non-degenerate almost Hamiltonian systems, i.e., generalized Hamiltonian systems defined with non-closed two-forms. Accordingly, the Dirac-Hamilton-Jacobi equation reduces to a variant of the nonholonomic Hamilton-Jacobi equation associated with the reduced system. We illustrate through a few examples how the Dirac-Hamilton-Jacobi equation can be used to exactly integrate the equations of motion.
Sadiq, Safeer; Mahmood, S.; Haque, Q.; Ali, Munazza Zulfiqar
2014-09-20
The propagation of electrostatic waves in a dense magnetized electron-positron-ion (EPI) plasma with nonrelativistic and ultrarelativistic degenerate electrons and positrons is investigated. The linear dispersion relation is obtained for slow and fast electrostatic waves in the EPI plasma. The limiting cases for ion acoustic wave (slow) and ion cyclotron wave (fast) are also discussed. Using the reductive perturbation method, two-dimensional propagation of ion acoustic solitons is found for both the nonrelativistic and ultrarelativistic degenerate electrons and positrons. The effects of positron concentration, magnetic field, and mass of ions on ion acoustic solitons are shown in numerical plots. The proper form of Fermi temperature for nonrelativistic and ultrarelativistic degenerate electrons and positrons is employed, which has not been used in earlier published work. The present investigation is useful for the understanding of linear and nonlinear electrostatic wave propagation in the dense magnetized EPI plasma of compact stars. For illustration purposes, we have applied our results to a pulsar magnetosphere.
Cosmological constant in SUGRA models with Planck scale SUSY breaking and degenerate vacua
C. D. Froggatt; R. Nevzorov; H. B. Nielsen; A. W. Thomas
2014-10-08
The empirical mass of the Higgs boson suggests small to vanishing values of the quartic Higgs self--coupling and the corresponding beta function at the Planck scale, leading to degenerate vacua. This leads us to suggest that the measured value of the cosmological constant can originate from supergravity (SUGRA) models with degenerate vacua. This scenario is realised if there are at least three exactly degenerate vacua. In the first vacuum, associated with the physical one, local supersymmetry (SUSY) is broken near the Planck scale while the breakdown of the SU(2)_W\\times U(1)_Y symmetry takes place at the electroweak (EW) scale. In the second vacuum local SUSY breaking is induced by gaugino condensation at a scale which is just slightly lower than \\Lambda_{QCD} in the physical vacuum. Finally, in the third vacuum local SUSY and EW symmetry are broken near the Planck scale.
Julien Laurat; Thomas Coudreau; Laurent Longchambon; Claude Fabre
2004-12-14
We describe a very stable type II optical parametric oscillator operated above threshold which provides 9.7 $\\pm$ 0.5 dB (89%) of quantum noise reduction on the intensity difference of the signal and idler modes. We also report the first experimental study by homodyne detection of the generated bright two-mode state in the case of frequency degenerate operation obtained by introducing a birefringent plate inside the optical cavity.
Ludwig-Maximilians-Universität, München
Relaxation of hot electrons in a degenerate two-dimensional electron system: transition to one, 2011) The energy relaxation channels of hot electrons far from thermal equilibrium in a degenerate two-dimensional electron system are investigated in transport experiments in a mesoscopic three- terminal device. We
LOW-NOISE BIASING OF VOLTAGE-CONTROLLED OSCILLATORS BY MEANS OF RESONANT INDUCTIVE DEGENERATION
Serdijn, Wouter A.
LOW-NOISE BIASING OF VOLTAGE-CONTROLLED OSCILLATORS BY MEANS OF RESONANT INDUCTIVE DEGENERATION|w.a.serdijn|j.r.long@its.tudelft.nl ABSTRACT Many of the existing theories on phase-noise generation in oscillators are concerned with the noise originating from the active part and the resonator, while the contribution of the biasing noise
A nonlinear model for magnetoacoustic waves in dense dissipative plasmas with degenerate electrons
Masood, W.; Jahangir, R.; Siddiq, M.; Eliasson, B.
2014-10-15
The properties of nonlinear fast magnetoacoustic waves in dense dissipative plasmas with degenerate electrons are studied theoretically in the framework of the Zabolotskaya-Khokhlov (ZK) equation for small but finite amplitude excitations. Shock-like solutions of the ZK equation are obtained and are applied to parameters relevant to white dwarf stars.
Mahmood, S.; Sadiq, Safeer; Haque, Q.
2013-12-15
Linear and nonlinear electrostatic waves in magnetized dense electron-ion plasmas are studied with nonrelativistic and ultra-relativistic degenerate and singly, doubly charged helium (He{sup +}, He{sup ++}) and hydrogen (H{sup +}) ions, respectively. The dispersion relation of electrostatic waves in magnetized dense plasmas is obtained under both the energy limits of degenerate electrons. Using reductive perturbation method, the Zakharov-Kuznetsov equation for nonlinear propagation of electrostatic solitons in magnetized dense plasmas is derived for both nonrelativistic and ultra-relativistic degenerate electrons. It is found that variations in plasma density, magnetic field intensity, different mass, and charge number of ions play significant role in the formation of electrostatic solitons in magnetized dense plasmas. The numerical plots are also presented for illustration using the parameters of dense astrophysical plasma situations such as white dwarfs and neutron stars exist in the literature. The present investigation is important for understanding the electrostatic waves propagation in the outer periphery of compact stars which mostly consists of hydrogen and helium ions with degenerate electrons in dense magnetized plasmas.
Bahlali, Khaled Djehiche, Boualem Mezerdi, Brahim
2007-12-15
We establish a stochastic maximum principle in optimal control of a general class of degenerate diffusion processes with global Lipschitz coefficients, generalizing the existing results on stochastic control of diffusion processes. We use distributional derivatives of the coefficients and the Bouleau Hirsh flow property, in order to define the adjoint process on an extension of the initial probability space.
Investigating the role of eEF1A2 in motor neuron degeneration
Griffiths, Lowri Ann
2011-11-25
Abnormal expression of the eukaryotic translation elongation factor 1A (eEF1A) has been implicated in disease states such as motor neuron degeneration and cancer. Two variants of eEF1A are found in mammals, named eEF1A1 ...
FROM CONSTANT TO NON-DEGENERATELY VANISHING MAGNETIC FIELDS IN SUPERCONDUCTIVITY
the distribution of superconductivity in a type II superconductor submitted to a vari- able magnetic fieldFROM CONSTANT TO NON-DEGENERATELY VANISHING MAGNETIC FIELDS IN SUPERCONDUCTIVITY BERNARD HELFFER- tivity in a type II superconductor subjected to a constant magnetic field. The second function describes
A non-degenerate Rao-Blackwellised particle filter for estimating static
SchÃ¶n, Thomas
A non-degenerate Rao-Blackwellised particle filter for estimating static parameters in dynamical some static parameter. This is true also for the RBPF, even if the static states are marginalised analytically by a Kalman filter. The reason is that the posterior density of the static states is computed
Feng, Jian
Parkinson's disease (PD) is characterized by the rela- tively selective degeneration into a stiff, hollow tube. Each Microtubule: A Common Target for Parkin and Parkinson's Disease Toxins JIAN performed on twins (Tanner and others 1999), reveal strong environmental connections to the disease
Accelerator-based neutron source using a cold deuterium target with degenerate electrons
Phillips, R. E.; Ordonez, C. A. [Department of Physics, University of North Texas, Denton, Texas 76203 (United States)] [Department of Physics, University of North Texas, Denton, Texas 76203 (United States)
2013-07-15
A neutron generator is considered in which a beam of tritons is incident on a hypothetical cold deuterium target with degenerate electrons. The energy efficiency of neutron generation is found to increase substantially with electron density. Recent reports of potential targets are discussed.
The Specific Heat of Normal, Degenerate Quark Matter: Non-Fermi Liquid Corrections
Daniel Boyanovsky; H. J. de Vega
2001-02-26
In normal degenerate quark matter, the exchange of dynamically screened transverse gluons introduces infrared divergences in the quark self-energies that lead to the breakdown of the Fermi liquid description. If the core of neutron stars are composed of quark matter with a normal component, cooling by direct quark Urca processes may be modified by non-Fermi liquid corrections. We find that while the quasiparticle density of states is finite and non-zero at the Fermi surface, its frequency derivative diverges and results in non-Fermi liquid corrections to the specific heat of the normal, degenerate component of quark matter. We study these non-perturbative non-Fermi liquid corrections to the specific heat and the temperature dependence of the chemical potential and show that these lead to a reduction of the specific heat.
Optical imaging through turbid media with a degenerate four-wave mixing correlation time gate
Sappey, Andrew D. (Golden, CO)
1998-04-14
Optical imaging through turbid media is demonstrated using a degenerate four-wave mixing correlation time gate. An apparatus and method for detecting ballistic and/or snake light while rejecting unwanted diffusive light for imaging structures within highly scattering media are described. Degenerate four-wave mixing (DFWM) of a doubled YAG laser in rhodamine 590 is used to provide an ultrafast correlation time gate to discriminate against light that has undergone multiple scattering and therefore has lost memory of the structures within the scattering medium. Images have been obtained of a test cross-hair pattern through highly turbid suspensions of whole milk in water that are opaque to the naked eye, which demonstrates the utility of DFWM for imaging through turbid media. Use of DFWM as an ultrafast time gate for the detection of ballistic and/or snake light in optical mammography is discussed.
Comments on the Evolution of Strongly Degenerate Neutrinos in the Early Universe
Kazuhide Ichikawa; Masahiro Kawasaki
2003-07-23
We reconsider the evolution of strongly degenerate neutrinos in the early universe. Our chief concern is the validity of the entropy conservation after the neutrino annihilation process has frozen out (so that the establishment of chemical equilibrium is not trivial). We argue that the entropy indeed conserves because elastic scattering keeps the neutrino and antineutrino distribution functions in the equilibrium form and the sum of their chemical potential keeps zero even after the neutrino annihilation freeze-out. We also simulate the evolution of the degenerate neutrino spectrum to support the argument. We conclude that the change in the neutrino degeneracy parameter when the relativistic degrees of freedom in the universe decreases is calculated using the entropy conservation and the lepton number conservation without worrying about at what temperature the neutrino annihilation process freezes out.
Caro, Florian; Saad, Mazen
2012-01-01
Our goal is the mathematical analysis of a two phase (liquid and gas) two components (water and hydrogen) system modeling the hydrogen displacement in a storage site for radioactive waste. We suppose that the water is only in the liquid phase and is incompressible. The hydrogen in the gas phase is supposed compressible and could be dissolved into the water with the Henry's law. The flow is described by the conservation of the mass of each components. The model is treated without simplified assumptions on the gas density. This model is degenerated due to vanishing terms. We establish an existence result for the nonlinear degenerate parabolic system based on new energy estimate on pressures.
From constant to non-degenerately vanishing magnetic fields in superconductivity
Bernard Helffer; Ayman Kachmar
2015-03-30
We explore the relationship between two reference functions arising in the analysis of the Ginzburg-Landau functional. The first function describes the distribution of superconductivity in a type II superconductor subjected to a constant magnetic field. The second function describes the distribution of superconductivity in a type II superconductor submitted to a variable magnetic field that vanishes non-degenerately along a smooth curve.
Single photon state generation from a continuous-wave non-degenerate optical parametric oscillator
Anne E. B. Nielsen; Klaus Mølmer
2014-10-08
We present a theoretical treatment of conditional preparation of one-photon states from a continuous-wave non-degenerate optical parametric oscillator. We obtain an analytical expression for the output state Wigner function, and we maximize the one-photon state fidelity by varying the temporal mode function of the output state. We show that a higher production rate of high fidelity Fock states is obtained if we condition the outcome on dark intervals around trigger photo detection events.
Hussain, S.; Mahmood, S.; Rehman, Aman-ur-
2014-11-15
Linear and nonlinear propagation of magnetosonic waves in the perpendicular direction to the ambient magnetic field is studied in dense plasmas for non-relativistic and ultra-relativistic degenerate electrons pressure. The sources of nonlinearities are the divergence of the ions and electrons fluxes, Lorentz forces on ions and electrons fluids and the plasma current density in the system. The Korteweg-de Vries equation for magnetosonic waves propagating in the perpendicular direction of the magnetic field is derived by employing reductive perturbation method for non-relativistic as well as ultra-relativistic degenerate electrons pressure cases in dense plasmas. The plots of the magnetosonic wave solitons are also shown using numerical values of the plasma parameters such a plasma density and magnetic field intensity of the white dwarfs from literature. The dependence of plasma density and magnetic field intensity on the magnetosonic wave propagation is also pointed out in dense plasmas for both non-relativistic and ultra-relativistic degenerate electrons pressure cases.
Ali, S.; Ata-ur-Rahman; Institute of Physics and Electronics, University of Peshawar, Peshawar 25000
2014-04-15
The linear and nonlinear properties of the ion-acoustic (IA) waves are investigated in a relativistically degenerate magnetoplasma, whose constituents are the electrons, positrons, and ions. The electrons and positrons are assumed to obey the Fermi-Dirac statistics, whereas the cold ions are taken to be inertial and magnetized. In linear analysis, various limiting cases are discussed both analytically and numerically. However, for nonlinear studies, the well-known reductive perturbation technique is employed to derive the Zakharov-Kuznetsov and Zakharov-Kuznetsov Burgers equations in the presence of relativistically degenerate electrons and positrons. Furthermore, with the use of hyperbolic tangent method, the equations are simplified to admit the soliton and shock wave solutions. Numerically, it is shown that the amplitude, width, and phase speed associated with the localized IA solitons and shocks are significantly influenced by the various intrinsic plasma parameters relevant to our model. The present analysis can be useful for understanding the collective processes in dense astrophysical environments like neutron stars, where the electrons and positrons are expected to be relativistic and degenerate.
Comparing EFT and Exact One-Loop Analyses of Non-Degenerate Stops
Aleksandra Drozd; John Ellis; Jeremie Quevillon; Tevong You
2015-04-09
We develop a universal approach to the one-loop effective field theory (EFT) using the Covariant Derivative Expansion (CDE) method. We generalise previous results to include broader classes of UV models, showing how expressions previously obtained assuming degenerate heavy-particle masses can be extended to non-degenerate cases. We apply our method to the general MSSM with non-degenerate stop squarks, illustrating our approach with calculations of the coefficients of dimension-6 operators contributing to the $hgg$ and $h\\gamma\\gamma$ couplings, and comparing with exact calculations of one-loop Feynman diagrams. We then use present and projected future sensitivities to these operator coefficients to obtain present and possible future indirect constraints on stop masses. The current sensitivity is already comparable to that of direct LHC searches, and future FCC-ee measurements could be sensitive to stop masses above a TeV. The universality of our one-loop EFT approach facilitates extending these constraints to a broader class of UV models.
Faye, Ibrahima; Seck, Diaraf
2009-01-01
In this paper we build models for short-term, mean-term and long-term dynamics of dune and megariple morphodynamics. They are models that are degenerated parabolic equations which are, moreover, singularly perturbed. We, then give an existence and uniqueness result for the short-term and mean-term models. This result is based on a time-space periodic solution existence result for degenerated parabolic equation that we set out. Finally the short-term model is homogenized.
Anatoly V. Latyshev; Alexander A. Yushkanov
2010-01-18
The linearized kinetic equation modelling behaviour of the degenerate quantum bose gas with the frequency of collisions depending on momentum of elementary excitations is constructed. The general case of dependence of the elementary excitations energy on momentum according to Bogolyubov formula is considered. The analytical solution of the half-space boundary problem on temperature jump on border of degenerate bose gas in the presence of a Bose - Einstein condensate is received. Expression for Kapitsa resistance is received.
Tracking Living Cells as They Differentiate in Real Time
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
these projects will target Alzheimer's disease, macular degeneration of the retina in diabetes, and mitochondrial diseases in children. In addition, specific processes like protein...
Building blocks for tobacco control: a handbook
World Health Organization - Tobacco Free Initiative
2004-01-01
defects • Intellectual impairment of offspring • Sudden infant death syndrome • Transient ischaemic attack • Stroke • Worsened multiple sclerosis Cataracts Macular degeneration Snoring Periodontal
A degeneration of two-phase solutions of focusing NLS via Riemann-Hilbert problems
Marco Bertola; Pietro Giavedoni
2014-12-06
Two-phase solutions of focusing NLS equation are classically constructed out of an appropriate Riemann surface of genus two, and expressed in terms of the corresponding theta-function. We show here that in a certain limiting regime such solutions reduce to some elementary ones called "Solitons on unstable condensate". This degeneration turns out to be conveniently studied by means of basic tools from the theory of Riemann-Hilbert problems. In particular no acquaintance with Riemann surfaces and theta-function is required for such analysis.
Non-degenerate two-photon absorption in silicon waveguides. Analytical and experimental study
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Zhang, Yanbing; Husko, Chad; Lefrancois, Simon; Rey, Isabella H.; Krauss, Thomas F.; Schröder, Jochen; Eggleton, Benjamin J.
2015-06-22
We theoretically and experimentally investigate the nonlinear evolution of two optical pulses in a silicon waveguide. We provide an analytic solution for the weak probe wave undergoing non-degenerate two-photon absorption (TPA) from the strong pump. At larger pump intensities, we employ a numerical solution to study the interplay between TPA and photo-generated free carriers. We develop a simple and powerful approach to extract and separate out the distinct loss contributions of TPA and free-carrier absorption from readily available experimental data. Our analysis accounts accurately for experimental results in silicon photonic crystal waveguides.
Detection of OH in a flame by degenerate four-wave mixing
Ewart, P.; O'Leary, S.V.
1986-05-01
The detection of OH in a laminar premixed air-methane flame by degenerate four-wave mixing (DFWM) is reported. The four-wave mixing spectrum was recorded in the region of the R/sub 1/, R/sub 2/ band heads of the (0, 0) /sup 2/..sigma..-/sup 2/Pi transition, showing clearly resolved rotational structure. Applications of the DFWM technique to combustion diagnostics are discussed. As an example, the distribution of sodium atoms in a sodium-seeded flame has been measured using a 90/sup 0/ geometry to enhance spatial resolution.
Temporally stable coherent states in energy degenerate systems: The hydrogen atom
Michael G. A. Crawford
2001-01-18
Klauder's recent generalization of the harmonic oscillator coherent states [J. Phys. A 29, L293 (1996)] is applicable only in non-degenerate systems, requiring some additional structure if applied to systems with degeneracies. The author suggests how this structure could be added, and applies the complete method to the hydrogen atom problem. To illustrate how a certain degree of freedom in the construction may be exercised, states are constructed which are initially localized and evolve semi-classically, and whose long time evolution exhibits "fractional revivals."
Multiplex Degenerate Primer Design for Targeted Whole Genome Amplification of Many Viral Genomes
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Gardner, Shea N.; Jaing, Crystal J.; Elsheikh, Maher M.; Peña, José; Hysom, David A.; Borucki, Monica K.
2014-01-01
Background. Targeted enrichment improves coverage of highly mutable viruses at low concentration in complex samples. Degenerate primers that anneal to conserved regions can facilitate amplification of divergent, low concentration variants, even when the strain present is unknown.Results. A tool for designing multiplex sets of degenerate sequencing primers to tile overlapping amplicons across multiple whole genomes is described. The new script, run_tiled_primers, is part of the PriMux software. Primers were designed for each segment of South American hemorrhagic fever viruses, tick-borne encephalitis, Henipaviruses, Arenaviruses, Filoviruses, Crimean-Congo hemorrhagic fever virus, Rift Valley fever virus, and Japanese encephalitis virus. Each group is highlymore »diverse with as little as 5% genome consensus. Primer sets were computationally checked for nontarget cross reactions against the NCBI nucleotide sequence database. Primers for murine hepatitis virus were demonstrated in the lab to specifically amplify selected genes from a laboratory cultured strain that had undergone extensive passage in vitro and in vivo.Conclusions. This software should help researchers design multiplex sets of primers for targeted whole genome enrichment prior to sequencing to obtain better coverage of low titer, divergent viruses. Applications include viral discovery from a complex background and improved sensitivity and coverage of rapidly evolving strains or variants in a gene family.« less
MSC response to pH levels found in degenerating intervertebral discs
Wuertz, Karin [School of Engineering, University of Vermont, Burlington, Vermont (United States); Spine Research Group, Competence Center for Applied Biotechnology and Molecular Medicine, University of Zurich, Zurich (Switzerland)], E-mail: wuertz@cabmm.uzh.ch; Godburn, Karolyn; Iatridis, James C. [School of Engineering, University of Vermont, Burlington, Vermont (United States)
2009-02-20
Painful degenerative disc disease is a major health problem and for successful tissue regeneration, MSCs must endure and thrive in a harsh disc microenvironment that includes matrix acidity as a critical factor. MSCs were isolated from bone marrow of Sprague-Dawley rats from two different age groups (<1 month, n = 6 and 4-5 months, n = 6) and cultured under four different pH conditions representative of the healthy, mildly or severely degenerated intervertebral disc (pH 7.4, 7.1, 6.8, and 6.5) for 5 days. Acidity caused an inhibition of aggrecan, collagen-1, and TIMP-3 expression, as well as a decrease in proliferation and viability and was associated with a change in cell morphology. Ageing had generally minor effects but young MSCs maintained greater mRNA expression levels. As acidic pH levels are typical of increasingly degenerated discs, our findings demonstrate the importance of early interventions and predifferentiation when planning to use MSCs for reparative treatments.
Riaud, Antoine; Baudoin, Michael; Matar, Olivier Bou
2015-01-01
Despite their self-reconstruction properties in heterogeneous media, Bessel beams are known to degenerate when they are refracted from an isotropic to an anisotropic medium. In this paper, we study the converse situation wherein an anisotropic Bessel beam is refracted into an isotropic medium. It is shown that these anisotropic Bessel beams also degenerate, leading to confined vortical waves that may serve as localized particle trap for acoustical tweezers. The linear nature of this degeneration allows the 3D control of this trap position by wavefront correction. Theory is confronted to experiments performed in the field of acoustics. A swirling surface acoustic wave is synthesized at the surface of a piezoelectric crystal by a MEMS integrated system and radiated inside a miniature liquid vessel. The wavefront correction is operated with inverse filter technique. This work opens perspectives for contactless on-chip manipulation devices.
Zhou Gang; Michael Weinstein
2008-11-03
Nonlinear Schrodinger / Gross-Pitaevskii equations play a central role in the understanding of nonlinear optical and macroscopic quantum systems. The large time dynamics of such systems is governed by interactions of the nonlinear ground state manifold, discrete neutral modes (``excited states'') and dispersive radiation. Systems with symmetry, in spatial dimensions larger than one, typically have degenerate neutral modes. Thus, we study the large time dynamics of systems with degenerate neutral modes. This requires a new normal form (nonlinear matrix Fermi Golden Rule) governing the system's large time asymptotic relaxation to the ground state (soliton) manifold.
arXiv:1105.4207v1[math.RT]21May2011 Affine and degenerate affine BMW algebras: The center
Ram, Arun
arXiv:1105.4207v1[math.RT]21May2011 Affine and degenerate affine BMW algebras: The center Zajj of California, Davis One Shields Ave Davis, CA 95616 virk@math.ucdavis.edu Abstract The degenerate affine and affine BMW algebras arise naturally in the context of Schur- Weyl duality for orthogonal and symplectic
Quantitative degenerate four-wave mixing spectroscopy: Probes for molecular species
Farrow, R.; Rakestraw, D.; Paul, P.; Lucht, R.; Danehy, P.; Friedman-Hill, E.; Germann, G. [Sandia National Laboratories, Livermore, CA (United States)
1993-12-01
Resonant degenerate four-wave mixing (DFWM) is currently the subject of intensive investigation as a sensitive diagnostic tool for molecular species. DFWM has the advantage of generating a coherent (beam-like) signal which results in null-background detection and provides excellent immunity to background-light interference. Since multiple one-photon resonances are involved in the signal generation process, the DFWM technique can allow sensitive detection of molecules via electronic, vibrational or rotational transitions. These properties combine to make DFWM a widely applicable diagnostic technique for the probing of molecular species. The authors are conducting fundamental and applied investigations of DFWM for quantitative measurements of trace species in reacting gases. During the past year, efforts have been focussed in two areas: (1) understanding the effects of collisional processes on the DFWM signal generation process, and (2) exploring the applicability of infrared DFWM to detect polyatomic molecules via rovibrational transitions.
Bethe Ansatz and Ordinary Differential Equation Correspondence for Degenerate Gaudin Models
Omar El Araby; Vladimir Gritsev; Alexandre Faribault
2012-04-25
In this work, we generalize the numerical approach to Gaudin models developed earlier by us to degenerate systems showing that their treatment is surprisingly convenient from a numerical point of view. In fact, high degeneracies not only reduce the number of relevant states in the Hilbert space by a non negligible fraction, they also allow to write the relevant equations in the form of sparse matrix equations. Moreover, we introduce a new inversion method based on a basis of barycentric polynomials which leads to a more stable and efficient root extraction which most importantly avoids the necessity of working with arbitrary precision. As an example we show the results of our procedure applied to the Richardson model on a square lattice.
Symmetries of the triple degenerate DNLS equations for weakly nonlinear dispersive MHD waves
Webb, G. M.; Brio, M.; Zank, G. P.
1996-07-20
A formulation of Hamiltonian and Lagrangian variational principles, Lie point symmetries and conservation laws for the triple degenerate DNLS equations describing the propagation of weakly nonlinear dispersive MHD waves along the ambient magnetic field, in {beta}{approx}1 plasmas is given. The equations describe the interaction of the Alfven and magnetoacoustic modes near the triple umbilic point, where the fast magnetosonic, slow magnetosonic and Alfven speeds coincide and a{sub g}{sup 2}=V{sub A}{sup 2} where a{sub g} is the gas sound speed and V{sub A} is the Alfven speed. A discussion is given of the travelling wave similarity solutions of the equations, which include solitary wave and periodic traveling waves. Strongly compressible solutions indicate the necessity for the insertion of shocks in the flow, whereas weakly compressible, near Alfvenic solutions resemble similar, shock free travelling wave solutions of the DNLS equation.
Degenerate ground states and nonunique potentials: Breakdown and restoration of density functionals
Capelle, K.; Ullrich, C. A.; Vignale, G.
2007-07-15
The Hohenberg-Kohn (HK) theorem is one of the most fundamental theorems of quantum mechanics, and constitutes the basis for the very successful density-functional approach to inhomogeneous interacting many-particle systems. Here we show that in formulations of density-functional theory (DFT) that employ more than one density variable, applied to systems with a degenerate ground state, there is a subtle loophole in the HK theorem, as all mappings between densities, wave functions, and potentials can break down. Two weaker theorems which we prove here, the joint-degeneracy theorem and the internal-energy theorem, restore the internal, total, and exchange-correlation energy functionals to the extent needed in applications of DFT to atoms, molecules, and solids. The joint-degeneracy theorem constrains the nature of possible degeneracies in general many-body systems.
Gravitational Wave Emission from the Single-Degenerate Channel of Type Ia Supernovae
David Falta; Robert T. Fisher; Gaurav Khanna
2011-05-28
The thermonuclear explosion of a C/O white dwarf as a Type Ia supernova (SN Ia) generates a kinetic energy comparable to that released by a massive star during a SN II event. Current observations and theoretical models have established that SNe Ia are asymmetric, and therefore--like SNe II--potential sources of gravitational wave (GW) radiation. We perform the first detailed calculations of the GW emission for a SN Ia of any type within the single-degenerate channel. The gravitationally-confined detonation (GCD) mechanism predicts a strongly-polarized GW burst in the frequency band around 1 Hz. Third-generation spaceborne GW observatories currently in planning may be able to detect this predicted signal from SNe Ia at distances up to 1 Mpc. If observable, GWs may offer a direct probe into the first few seconds of the SNe Ia detonation.
Latyshev, A V
2015-01-01
Kinetic Vlasov-Boltzmann equation for degenerate collisional plasmas with integral of collisions of relaxation type BGK (Bhatnagar, Gross and Krook) is used. Square-law expansion on size of intensity of electric field for kinetic equation, Lorentz's force and integral of collisions is considered. It is shown, that nonlinearity leads to generation of the longitudinal electric current directed along a wave vector. Longitudinal current is perpendicular to the known transversal classical current received at the linear analysis. The case of small values of wave number is considered. When frequency of collisions tends to the zero, all received results for collisional pass plasmas in corresponding results for collisionless plasmas. Graphic research of the real and imaginary part current density is carried out.
CP asymmetry in heavy Majorana neutrino decays at finite temperature: the nearly degenerate case
Biondini, Simone; Escobedo, Miguel Angel; Vairo, Antonio
2015-01-01
In a model where Majorana neutrinos heavier than the electroweak scale couple to Standard Model Higgs bosons and leptons, we compute systematically thermal corrections to the direct and indirect CP asymmetries in the Majorana neutrino decays. These are key ingredients entering the equations that describe the thermodynamic evolution of the induced lepton-number asymmetry eventually leading to the baryon asymmetry in the universe. We compute the thermal corrections in an effective field theory framework that assumes the temperature smaller than the masses of the Majorana neutrinos and larger than the electroweak scale, and we provide the leading corrections in an expansion of the temperature over the mass. In this work, we consider the case of two Majorana neutrinos with nearly degenerate masses.
Degenerate optomechanical parametric oscillators: cooling in the vicinity of a critical point
Degenfeld-Schonburg, Peter; Hartmann, Michael J; Navarrete-Benlloch, Carlos
2015-01-01
Degenerate optomechanical parametric oscillators are optical resonators in which a mechanical degree of freedom is coupled to a cavity mode that is nonlinearly amplified via parametric down-conversion of an external pumping laser. Below a critical pumping power the down-converted field is purely quantum-mechanical, making the theoretical description of such systems very challenging. Here we introduce a theoretical approach that is capable of describing this regime, even at the critical point itself. We find that the down-converted field can induce significant mechanical cooling and identify the process responsible of this as a "cooling by heating" mechanism. Moreover, we show that, contrary to naive expectations and semi-classical predictions, cooling is not optimal at the critical point, where the photon number is largest. Our approach opens the possibility for analyzing further hybrid dissipative quantum systems in the vicinity of critical points.
Degenerate limit thermodynamics beyond leading order for models of dense matter
Constantinou, Constantinos; Prakash, Madappa; Lattimer, James M
2015-01-01
Analytical formulas for next-to-leading order temperature corrections to the thermal state variables of interacting nucleons in bulk matter are derived in the degenerate limit. The formalism developed is applicable to a wide class of non-relativistic and relativistic models of hot and dense matter currently used in nuclear physics and astrophysics (supernovae, proto-neutron stars and neutron star mergers) as well as in condensed matter physics. We consider the general case of arbitrary dimensionality of momentum space and an arbitrary degree of relativity (for relativistic mean-field theoretical models). For non-relativistic zero-range interactions, knowledge of the Landau effective mass suffices to compute next-to-leading order effects, but in the case of finite-range interactions, momentum derivatives of the Landau effective mass function up to second order are required. Numerical computations are performed to compare results from our analytical formulas with the exact results for zero- and finite-range pot...
Doping against the native propensity of MoS?: Degenerate hole doping by cation substitution
Suh, Joonki; Park, Tae-Eon; Lin, Der-Yuh; Fu, Deyi; Park, Joonsuk; Jung, Hee Joon; Chen, Yabin; Ko, Changhyun; Jang, Chaun; Sun, Yinghui; Sinclair, Robert; Chang, Joonyeon; Tongay, Sefaattin; Wu, Junqiao
2014-12-10
Layered transition metal dichalcogenides (TMDs) draw much attention as the key semiconducting material for two-dimensional electrical, optoelectronic, and spintronic devices. For most of these applications, both n- and p-type materials are needed to form junctions and support bipolar carrier conduction. However, typically only one type of doping is stable for a particular TMD. For example, molybdenum disulfide (MoS?) is natively an n-type presumably due to omnipresent electron-donating sulfur vacancies, and stable/controllable p-type doping has not been achieved. The lack of p-type doping hampers the development of charge-splitting p–n junctions of MoS?, as well as limits carrier conduction to spin-degenerate conduction bands instead of the more interesting, spin-polarized valence bands. Traditionally, extrinsic p-type doping in TMDs has been approached with surface adsorption or intercalation of electron-accepting molecules. However, practically stable doping requires substitution of host atoms with dopants where the doping is secured by covalent bonding. In this work, we demonstrate stable p-type conduction in MoS? by substitutional niobium (Nb) doping, leading to a degenerate hole density of ~3 × 10¹? cm?³. Structural and X-ray techniques reveal that the Nb atoms are indeed substitutionally incorporated into MoS? by replacing the Mo cations in the host lattice. van der Waals p–n homojunctions based on vertically stacked MoS? layers are fabricated, which enable gate-tunable current rectification. A wide range of microelectronic, optoelectronic, and spintronic devices can be envisioned from the demonstrated substitutional bipolar doping of MoS?. From the miscibility of dopants with the host, it is also expected that the synthesis technique demonstrated here can be generally extended to other TMDs for doping against their native unipolar propensity.
Dobrescu, Bogdan E.
2009-06-02
In this thesis I present a nonequilibrium quantum field theory that describes the production of molecular dimers from a two-component quantum-degenerate atomic Fermi gas, via a linear downward sweep of a magnetic field across an s-wave Feshbach...
Research Article An Age-Related Deficit in
Scholl, Brian
) with age (Grady, 2000; Gunning-Dixon & Raz, 2000; O'Sullivan et al., 2001; Raz, 2000; West, 1996), strongly; Logan, Sanders, Snyder, Morris, & Buckner, 2002; Park, Polk, Mikels, Taylor, & Mar- shuetz, 2001; Reuter-Lorenz, 2002; Reuter-Lorenz, Marshuetz, Jonides, & Smith, 2001; Stebbins et al., 2002): Sometimes older adults
Age-related changes in False Recognition: An ERP Study
Robb, Lindsey
2011-01-01
to falsely “remember” events which did not happen, by misleading post-event information, compared to younger adults. An exploratory analysis of left parietal old/new effects from collected ERP data revealed unexpected conclusions. False alarms to lure stimuli...
Degenerate Higgs bosons decays to ${??}$ and ${Z?}$ in the type II Seesaw Model
M. Chabab; M. C. Peyranere; L. Rahili
2014-08-11
Using the most recent results of CMS and ATLAS, we study the Higgs decays to $\\gamma\\gamma$ and $Z\\gamma$ in the scenario where the two CP even Higgs predicted by the type II seesaw model (HTM) are close to mass degenerate with a mass near $125$ GeV. We analyse the effects of the Higgs potential parameters constrained by the full set of perturbative unitarity, boundedness from below (BFB) as well as from precision electroweak measurements on these decay modes. Our analysis demonstrates that the observed excess in the diphoton Higgs decay channel can be interpreted in our scenario within a delineated region controlled by $\\lambda_{1}$ and $\\lambda_{4}$ coupling. We also find a deviation in the Higgs decay to $Z\\gamma$ with respect to the Standard Model prediction and the largest enhancement is found for a ratio $R_{Z\\gamma}$ of the order $1.6$. Furthermore we show that consistency with current ATLAS data on the diphoton decay channel favours a light doubly charged Higgs with mass in the range $92 - 180$~GeV. Finally, we find that the $\\gamma\\gamma$ and $Z \\gamma$ Higgs decay modes are generally correlated and the magnitude of correlation is sensitive to the sign of the $\\lambda_{1}$ parameter.
Discrete flavour symmetries for degenerate solar neutrino pair and their predictions
Anjan S. Joshipura; Ketan M. Patel
2014-05-23
Flavour symmetries appropriate for describing a neutrino spectrum with degenerate solar pair and a third massive or massless neutrino are discussed. We demand that the required residual symmetries of the leptonic mass matrices be subgroups of some discrete symmetry group $G_f$. $G_f$ can be a subgroup of SU(3) if the third neutrino is massive and we derive general results on the mixing angle predictions for various discrete subgroups of SU(3). The main results are: (a) All the SU(3) subgroups of type C fail in simultaneously giving correct $\\theta_{13}$ and $\\theta_{23}$. (b) All the groups of type D can predict a relation $\\cos^2\\theta_{13} \\sin^2\\theta_{23}=\\frac{1}{3}$ among the mixing angles which appears to be a good zeroth order approximation. Among these, various $\\Delta(6n^2)$ groups with $n\\geq 8$ can simultaneously lead also to $\\sin^2 \\theta_{13}$ in agreement with global fit at 3$\\sigma$. (c) The group $\\Sigma(168)\\cong PSL(2,7)$ predicts near to the best fit value for $\\theta_{13}$ and $\\theta_{23}$ within the 1$\\sigma$ range. All discrete subgroups of U(3) with order $predict $\\theta_{13}$ and/or $\\theta_{23}$. The solar angle remains undetermined at the leading order in all the cases due to degeneracy in the masses. A class of general perturbations which can correctly reproduce all the observables are discussed in the context of several groups which offer good leading order predictions.
Reaction-in-Flight Neutrons as a Test of Stopping Power in Degenerate Plasmas
A. C. Hayes; Gerard Jungman; A. E. Schulz; M. Boswell; M. M. Fowler; G. Grim; A. Klein; R. S. Rundberg; J. B. Wilhelmy; D. Wilson
2014-11-25
We present the first measurements of reaction-in-flight (RIF) neutrons in an inertial confinement fusion system. The experiments were carried out at the National Ignition Facility, using both Low Foot and High Foot drives and cryogenic plastic capsules. In both cases, the high-energy RIF ($E_n>$ 15 MeV) component of the neutron spectrum was found to be about $10^{-4}$ of the total. The majority of the RIF neutrons were produced in the dense cold fuel surrounding the burning hotspot of the capsule and the data are consistent with a compressed cold fuel that is moderately to strongly coupled $(\\Gamma\\sim$0.6) and electron degenerate $(\\theta_\\mathrm{Fermi}/\\theta_e\\sim$4). The production of RIF neutrons is controlled by the stopping power in the plasma. Thus, the current RIF measurements provide a unique test of stopping power models in an experimentally unexplored plasma regime. We find that the measured RIF data strongly constrain stopping models in warm dense plasma conditions and some models are ruled out by our analysis of these experiments.
Smoothed Particle Hydrodynamics simulations of the core-degenerate scenario for Type Ia supernovae
Aznar-Siguán, G; Lorén-Aguilar, P; Soker, N; Kashi, A
2015-01-01
The core-degenerate (CD) scenario for type Ia supernovae (SN Ia) involves the merger of the hot core of an asymptotic giant branch (AGB) star and a white dwarf, and might contribute a non-negligible fraction of all thermonuclear supernovae. Despite its potential interest, very few studies, and based on only crude simplifications, have been devoted to investigate this possible scenario, compared with the large efforts invested to study some other scenarios. Here we perform the first three-dimensional simulations of the merger phase, and find that this process can lead to the formation of a massive white dwarf, as required by this scenario. We consider two situations, according to the mass of the circumbinary disk formed around the system during the final stages of the common envelope phase. If the disk is massive enough, the stars merge on a highly eccentric orbit. Otherwise, the merger occurs after the circumbinary disk has been ejected and gravitational wave radiation has brought the stars close to the Roche...
Abdoli-Arani, A.; Jazi, B. [Department of Photonics, Faculty of Physics, University of Kashan, Kashan (Iran, Islamic Republic of); Shokri, B. [Physics Department and Laser-Plasma Research Institute, G. C. Shahid Beheshti University, Tehran (Iran, Islamic Republic of)
2013-02-15
The dynamics and energy gain of an electron in the field of a transverse magnetic wave propagating inside an elliptical degenerate plasma waveguide is analytically investigated by finding the field components of the TM{sub mr} mode in this waveguide. Besides, by solving the relativistic momentum and energy equations the deflection angle and the acceleration gradient of the electron in the waveguide are obtained. Furthermore, the field components of the hybrid mode and the transferred power in the presence of the magnetic field in this waveguide are found. Also by applying the boundary conditions at the plasma-conductor interface, we calculate the dispersion relation. It is shown that the cutoff frequency of this mode is dependent on the plasma density but independent of the magnetic field. Then, a single-electron model for numerical calculations of the electron deflection angle and acceleration gradient inside the magnetized plasma-filled elliptical waveguide is generally presented to be used as a cascading process for the acceleration purposes.
Hillman, Yael; Kovetz, Attay; Shara, Michael M
2015-01-01
Can a white dwarf, accreting hydrogen-rich matter from a non-degenerate companion star, ever exceed the Chandrasekhar mass and explode as a type Ia supernova? We explore the range of accretion rates that allow a white dwarf (WD) to secularly grow in mass, and derive limits on the accretion rate and on the initial mass that will allow it to reach $1.4M_\\odot$ --- the Chandrasekhar mass. We follow the evolution through a long series of hydrogen flashes, during which a thick helium shell accumulates. This determines the effective helium mass accretion rate for long-term, self-consistent evolutionary runs with helium flashes. We find that net mass accumulation always occurs despite helium flashes. Although the amount of mass lost during the first few helium shell flashes is a significant fraction of that accumulated prior to the flash, that fraction decreases with repeated helium shell flashes. Eventually no mass is ejected at all during subsequent flashes. This unexpected result occurs because of continual heati...
Ultra-low power, Zeno effect based optical modulation in a degenerate V-system with a
Shahriar, Selim
Ultra-low power, Zeno effect based optical modulation in a degenerate V-system with a tapered nano@northwestern.edu Abstract: We demonstrate an ultra-low light level optical modulator using a tapered nano fiber embedded. For a control power of 40 nW and a signal power of 100 pW, we observe near 100% modulation. The ultra-low power
Non-Fermi-Liquid Specific Heat of Normal Degenerate Quark Matter
A. Gerhold; A. Ipp; A. Rebhan
2004-08-31
We compute the low-temperature behavior of the specific heat of normal (non-color-superconducting) degenerate quark matter as well as that of an ultradegenerate electron gas. Long-range magnetic interactions lead to non-Fermi-liquid behavior with an anomalous leading $T\\ln T^{-1}$ term. Depending on the thermodynamic potential used as starting point, this effect appears as a consequence of the logarithmic singularity in the fermion self-energy at the Fermi surface or directly as a contribution from the only weakly screened quasistatic magnetic gauge bosons. We show that a calculation of Boyanovsky and de Vega claiming the absence of a leading $T\\ln T^{-1}$ term missed it by omitting vector boson contributions to the internal energy. Using a formulation which collects all nonanalytic contributions in bosonic ring diagrams, we systematically calculate corrections beyond the well-known leading-log approximation. The higher-order terms of the low-temperature expansion turn out to also involve fractional powers $T^{(3+2n)/3}$ and we explicitly determine their coefficients up to and including order $T^{7/3}$ as well as the subsequent logarithmically enhanced term $T^3 \\ln (c/T)$. We derive also a hard-dense-loop resummed expression which contains the infinite series of anomalous terms to leading order in the coupling and which we evaluate numerically. At low temperatures, the resulting deviation of the specific heat from its value in naive perturbation theory is significant in the case of strongly coupled normal quark matter and thus of potential relevance for the cooling rates of (proto-)neutron stars with a quark matter component.
Pan, Kuo-Chuan; Ricker, Paul M. [Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 West Green Street, Urbana, IL 61801 (United States); Taam, Ronald E., E-mail: kpan2@illinois.edu, E-mail: pmricker@illinois.edu, E-mail: r-taam@northwestern.edu [Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 (United States)
2013-08-10
The progenitor systems of Type Ia supernovae (SNe Ia) are still under debate. Based on recent hydrodynamics simulations, non-degenerate companions in the single-degenerate scenario (SDS) should survive the supernova (SN) impact. One way to distinguish between the SDS and the double-degenerate scenario is to search for the post-impact remnant stars (PIRSs) in SN Ia remnants. Using a technique that combines multi-dimensional hydrodynamics simulations with one-dimensional stellar evolution simulations, we have examined the post-impact evolution of helium-rich binary companions in the SDS. It is found that these helium-rich PIRSs (He PIRSs) dramatically expand and evolve to a luminous phase (L {approx} 10{sup 4} L{sub Sun }) about 10 yr after an SN explosion. Subsequently, they contract and evolve to become hot blue-subdwarf-like (sdO-like) stars by releasing gravitational energy, persisting as sdO-like stars for several million years before evolving to the helium red-giant phase. We therefore predict that a luminous OB-like star should be detectable within {approx}30 yr after the SN explosion. Thereafter, it will shrink and become an sdO-like star in the central regions of SN Ia remnants within star-forming regions for SN Ia progenitors evolved via the helium-star channel in the SDS. These He PIRSs are predicted to be rapidly rotating (v{sub rot} {approx}> 50 km s{sup -1}) and to have high spatial velocities (v{sub linear} {approx}> 500 km s{sup -1}). Furthermore, if SN remnants have diffused away and are not recognizable at a later stage, He PIRSs could be an additional source of single sdO stars and/or hypervelocity stars.
Biocompatibility of an implantable ophthalmic drug delivery device
Cohen, Sarah J. (Sarah Jennifer)
2007-01-01
Diseases of the posterior eye present clinicians with a treatment challenge mainly due to the region's inaccessible location. Several drugs, including those available for the treatment of exudative age-related macular ...
L. P. de Oliveira; A. S. de Castro
2015-04-01
The scattering of spin-1 bosons in a nonminimal vector double-step potential is described in terms of eigenstates of the helicity operator and it is shown that the transmission coefficient is insensitive to the choice of the polarization of the incident beam. Poles of the transmission amplitude reveal the existence of a two-fold degenerate spectrum. The results are interpreted in terms of solutions of two coupled effective Schr\\"{o}dinger equations for a finite square well with additional $\\delta $-functions situated at the borders.
Carlos Navarrete-Benlloch; Germán J. de Valcárcel; Eugenio Roldán
2009-10-13
We theoretically describe the quantum properties of a large Fresnel number degenerate optical parametric oscillator with spherical mirrors that is pumped by a Gaussian beam. The resonator is tuned so that the resonance frequency of a given transverse mode family coincides with the down-converted frequency. After demonstrating that only the lower orbital angular momentum (OAM) Laguerre-Gauss modes are amplified above threshold, we focus on the quantum properties of the rest of (classically empty) modes. We find that combinations of opposite OAM (Hybrid Laguerre-Gauss modes) can exhibit arbitrary large quadrature squeezing for the lower OAM non amplified modes.
Yagi, Kiyoshi, E-mail: kiyoshi.yagi@riken.jp; Otaki, Hiroki [Theoretical Molecular Science Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)] [Theoretical Molecular Science Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
2014-02-28
A perturbative extension to optimized coordinate vibrational self-consistent field (oc-VSCF) is proposed based on the quasi-degenerate perturbation theory (QDPT). A scheme to construct the degenerate space (P space) is developed, which incorporates degenerate configurations and alleviates the divergence of perturbative expansion due to localized coordinates in oc-VSCF (e.g., local O–H stretching modes of water). An efficient configuration selection scheme is also implemented, which screens out the Hamiltonian matrix element between the P space configuration (p) and the complementary Q space configuration (q) based on a difference in their quantum numbers (?{sub pq} = ?{sub s}|p{sub s} ? q{sub s}|). It is demonstrated that the second-order vibrational QDPT based on optimized coordinates (oc-VQDPT2) smoothly converges with respect to the order of the mode coupling, and outperforms the conventional one based on normal coordinates. Furthermore, an improved, fast algorithm is developed for optimizing the coordinates. First, the minimization of the VSCF energy is conducted in a restricted parameter space, in which only a portion of pairs of coordinates is selectively transformed. A rational index is devised for this purpose, which identifies the important coordinate pairs to mix from others that may remain unchanged based on the magnitude of harmonic coupling induced by the transformation. Second, a cubic force field (CFF) is employed in place of a quartic force field, which bypasses intensive procedures that arise due to the presence of the fourth-order force constants. It is found that oc-VSCF based on CFF together with the pair selection scheme yields the coordinates similar in character to the conventional ones such that the final vibrational energy is affected very little while gaining an order of magnitude acceleration. The proposed method is applied to ethylene and trans-1,3-butadiene. An accurate, multi-resolution potential, which combines the MP2 and coupled-cluster with singles, doubles, and perturbative triples level of electronic structure theory, is generated and employed in the oc-VQDPT2 calculation to obtain the fundamental tones as well as selected overtones/combination tones coupled to the fundamentals through the Fermi resonance. The calculated frequencies of ethylene and trans-1,3-butadiene are found to be in excellent agreement with the experimental values with a mean absolute error of 8 and 9 cm{sup ?1}, respectively.
Elastic properties of the degenerate f.c.c. crystal of polydisperse soft dimers at zero temperature
Narojczyk, J W
2015-01-01
Elastic properties of soft, three-dimensional dimers, interacting through site-site n-inverse-power potential, are determined by computer simulations at zero temperature. The degenerate crystal of dimers exhibiting (Gaussian) size distribution of atomic diameters - i.e. size polydispersity - is studied at the molecular number density $1/\\sqrt{2}$; the distance between centers of atoms forming dimers is considered as a length unit. It is shown that, at the fixed number density of the dimers, increasing polydispersity causes, typically, an increase of pressure, elastic constants and Poisson's ratio; the latter is positive in most direction. A direction is found, however, in which the size polydispersity causes substantial decrease of Poisson's ratio, down to negative values for large $n$. Thus, the system is partially auxetic for large polydispersity and large n.
Elastic properties of the degenerate f.c.c. crystal of polydisperse soft dimers at zero temperature
J. W. Narojczyk; K. W. Wojciechowski
2015-04-12
Elastic properties of soft, three-dimensional dimers, interacting through site-site n-inverse-power potential, are determined by computer simulations at zero temperature. The degenerate crystal of dimers exhibiting (Gaussian) size distribution of atomic diameters - i.e. size polydispersity - is studied at the molecular number density $1/\\sqrt{2}$; the distance between centers of atoms forming dimers is considered as a length unit. It is shown that, at the fixed number density of the dimers, increasing polydispersity causes, typically, an increase of pressure, elastic constants and Poisson's ratio; the latter is positive in most direction. A direction is found, however, in which the size polydispersity causes substantial decrease of Poisson's ratio, down to negative values for large $n$. Thus, the system is partially auxetic for large polydispersity and large n.
thermal equilibrium argon arc plasma. DFWM spectroscopy has been used for line pro¢le measurements as well.543 nm) in an electric argon arc plasma using degenerate four-wave mixing (DFWM) spectroscopy. DFWM as for plasma diagnostics. At high laser intensities, the relationship between DFWM signal intensity and plasma
Pardo, Bryan
36th International Conference on Acoustics, Speech and Signal Processing (ICASSP 2011) May 22 The Degenerate Unmixing Estimation Technique (DUET) is a Blind Source Separation (BSS) algorithm for stereo audio. DUET depends on an amplitude-phase 2d histogram built from the differences between the two channels
Brief Communication Reorganization of Visual Processing in
Kanwisher, Nancy
Brief Communication Reorganization of Visual Processing in Macular Degeneration Chris I. Baker,1. In such cases, the macular damage eliminates the normal retinal input to a large region of visual cortex subjects with extensive bilateral central retinal lesions, we found that parts of visual cortex (including
Marion, G H; Vinkó, Jozsef; Silverman, Jeffrey M; Sand, David J; Challis, Peter; Kirshner, Robert P; Wheeler, J Craig; Berlind, Perry; Brown, Warren R; Calkins, Michael L; Dhungana, Govinda; Foley, Ryan J; Friedman, Andrew S; Graham, Melissa L; Howell, D Andrew; Hsiao, Eric Y; Irwin, Jonathan M; Kehoe, Robert; Macri, Lucas M; Mandel, Kaisey; McCully, Curtis; Rines, Kenneth J; Wilhelmy, Steven; Zheng, Weikang
2015-01-01
We report evidence for excess blue light from the Type Ia supernova SN~2012cg at fifteen and sixteen days before maximum B-band brightness. The emission is consistent with predictions for the impact of the supernova on a non-degenerate binary companion. This is the first evidence for emission from a companion to a normal SN~Ia. Sixteen days before maximum light, the B-V color of SN~2012cg is 0.2 mag bluer than for other normal SN~Ia. At later times, this supernova has a typical SN~Ia light curve, with extinction-corrected M_B = -19.62 \\pm 0.02 mag and Delta m_{15}(B) = 0.86 \\pm 0.02. Our data set is extensive, with photometry in 7 filters from 5 independent sources. Early spectra also show the effects of blue light, and high-velocity features are observed at early times. Near maximum, the spectra are normal with a silicon velocity v_{Si} = -10,500 km/s. Comparing the early data with models by Kasen (2010) favors a main-sequence companion of about 6 solar masses. It is possible that many other SN Ia have main-...
Degenerate Higgs bosons decays to ${\\gamma\\gamma}$ and ${Z\\gamma}$ in the type II seesaw Model
Chabab, M; Rahili, L
2014-01-01
Using the most recent results of CMS and ATLAS, we study the Higgs decays to $\\gamma\\gamma$ and $Z\\gamma$ in the scenario where the two CP even Higgs predicted by the type II seesaw model (HTM) are close to mass degenerate with a mass near $125$ GeV. We analyse the effects of the Higgs potential parameters constrained by the full set of perturbative unitarity, boundedness from below (BFB) as well as from precision electroweak measurements on these decay modes. Our analysis demonstrates that the observed excess in the diphoton Higgs decay channel can be interpreted in our scenario within a delineated region controlled by $\\lambda_{1}$ and $\\lambda_{4}$ coupling. We also find a deviation in the Higgs decay to $Z\\gamma$ with respect to the Standard Model prediction and the largest enhancement is found for a ratio $R_{Z\\gamma}$ of the order $1.6$. Furthermore we show that consistency with current ATLAS data on the diphoton decay channel favours a light doubly charged Higgs with mass in the range $92 - 180$~GeV. F...
Wes Armour; Simon Hands; Costas Strouthos
2013-02-07
We formulate a model of N_f=4 flavors of relativistic fermion in 2+1d in the presence of a chemical potential mu coupled to two flavor doublets with opposite sign, akin to isopsin chemical potential in QCD. This is argued to be an effective theory for low energy electronic excitations in bilayer graphene, in which an applied voltage between the layers ensures equal populations of particles on one layer and holes on the other. The model is then reformulated on a spacetime lattice using staggered fermions, and in the absence of a sign problem, simulated using an orthodox hybrid Monte Carlo algorithm. With the coupling strength chosen to be close to a quantum critical point believed to exist for N_f
Peter Degenfeld-Schonburg; Carlos Navarrete-Benlloch; Michael J. Hartmann
2015-03-11
Nonlinear quantum optical systems are of paramount relevance for modern quantum technologies, as well as for the study of dissipative phase transitions. Their nonlinear nature makes their theoretical study very challenging and hence they have always served as great motivation to develop new techniques for the analysis of open quantum systems. In this article we apply the recently developed self-consistent projection operator theory to the degenerate optical parametric oscillator to exemplify its general applicability to quantum optical systems. We show that this theory provides an efficient method to calculate the full quantum state of each mode with high degree of accuracy, even at the critical point. It is equally successful in describing both the stationary limit and the dynamics, including regions of the parameter space where the numerical integration of the full problem is significantly less efficient. We further develop a Gaussian approach consistent with our theory, which yields sensibly better results than the previous Gaussian methods developed for this system, most notably standard linearization techniques.
Benvenuto, Omar G; Kitamura, Hikaru; Hachisu, Izumi
2015-01-01
We study the occurrence of delayed SNe~Ia in the single degenerate (SD) scenario. We assume that a massive carbon-oxygen (CO) white dwarf (WD) accretes matter coming from a companion star, making it to spin at the critical rate. We assume uniform rotation due to magnetic field coupling. The carbon ignition mass for non-rotating WDs is M_{ig}^{NR} \\approx 1.38 M_{\\odot}; while for the case of uniformly rotating WDs it is a few percent larger (M_{ig}^{R} \\approx 1.43 M_{\\odot}). When accretion rate decreases, the WD begins to lose angular momentum, shrinks, and spins up; however, it does not overflow its critical rotation rate, avoiding mass shedding. Thus, angular momentum losses can lead the CO WD interior to compression and carbon ignition, which would induce an SN~Ia. The delay, largely due to the angular momentum losses timescale, may be large enough to allow the companion star to evolve to a He WD, becoming undetectable at the moment of explosion. This scenario supports the occurrence of delayed SNe~Ia if...
Tadashi Nakajima; Masahiro Morikawa
2005-06-25
Equilibrium configurations of weakly interacting fully degenerate fermionic dark matter are considered at various scales in the Universe. We treat the general situations for the gravity from Newtonian to general relativity and the degeneracy from nonrelativistic to relativistic. A dimensionless equilibrium configuration is specified by a single parameter regardless of particle properties, the Fermi velocity at the center, and the scalings of mass and length are specified by the rest mass and statistical weight of the dark matter particle. We focus our attention to the flat-top nature of the mass column density profile of the cluster of galaxies, A1689, recently reported by Broadhurst et al. using gravitational lensing. We convert the column density profile to a volume density profile assuming spherical symmetry and derive a 3D encircled mass profile of A1689, which is compared with the model profiles of degenerate fermion structures. The flat-top profile is reproduced. The corresponding fermion mass ranges from 2 eV to 30 eV depending on the actual scale of the degenerate structure. If massive neutrinos are the dominant dark matter, the rest mass will be about 4.7 or 2.3 eV respectively for Majorana or Dirac neutrinos. The mass and size of the degenerate structure are $10^{14}M_\\odot$ and 100 kpc for Majorana neutrinos, and 5$\\times10^{14}M_\\odot$ and 300 kpc for Dirac neutrinos. If we identify the fermions as heavier sterile neutrinos, they yield the characteristic mass hierarchy of black holes; giant black hole at the center of a galaxy and the intermediate mass black holes. Thus we propose the possibility that the mass hierarchy of fermions determines that of black holes in the Universe.
Bargiela, Andrzej
: Retina; retinal prosthesis; vision; image processing; neural computation. #12;210 T. T. Kien, T. Maul.1142/S2010194512005272 209 A REVIEW OF RETINAL PROSTHESIS APPROACHES TRAN TRUNG KIEN School of Computer-related macular degeneration and retinitis pigmentosa are two of the most common diseases that cause degeneration
Ion-acoustic K-dV and mK-dV solitons in a degenerate electron-ion dense plasma
Nahar, L.; Zobaer, M. S.; Roy, N.; Mamun, A. A. [Department of Physics, Jahangirnagar University, Savar, Dhaka-1342 (Bangladesh)
2013-02-15
A theoretical investigation has been made of the nonlinear propagation of ion-acoustic waves associated with a dense plasma system consisting degenerate electron and ion fluids. This fluid model, which is valid for both the non-relativistic and ultra-relativistic limits, has been employed with the reductive perturbation method. The K-dV and modified K-dV (mK-dV) equations have been derived and numerically analyzed. The basic features of solitons have been observed. It has been shown that the plasma system under consideration supports the propagation of solitons (electrostatic solitary structures) obtained from the solutions of K-dV and mK-dV equations. The implications of our results obtained from this investigation in compact astrophysical objects have been briefly discussed.
Touch, Joe
Fig. 1: (a) Conventional dual-pump degenerate PSA using a straight HNLF: phase regeneration effect varies with polarization alignment between BPSK signal and two phase-locked pumps. (b) Polarization. Pump 2Signal Pump 1 HNLF Impaired by phase noise I Q Single-polarization BPSK signal Pump1 (Phase
TEACHING ABOUT THE BIOLOGICAL CLOCK: Age-Related Fertility Decline and Sex Education
Macintosh, Kerry Lynn
2015-01-01
to choose motherhood over education or work. 180 Id. at 352.comprehensive sexual health education . ?. ?. ?. ”) (receive HIV/AIDS prevention education once in middle school
The effects of changing exercise levels on weight and age-related weight gain
Williams, Paul T.; Wood, Peter D.
2004-01-01
cumulative energy intake to Some of the Intra-individual variability in expenditure is estimated be less than 2% of energy expenditure
Age-Related Synaptic Loss of the Medial Olivocochlear Efferent Innervation
2010-01-01
a comparison of findings in CBA mice with human listeners.in young-adult and old CBA and C57 mice. J Acoust Soc Am 41.be present even at 22 months in CBA/CaJ mice because the MOC
Female-Specific Effects on Age-Related Spatial Learning Decline in Songbirds
Kosarussavadi, Saritha
2015-01-01
sexual dimorphism in spatial cognition could be generalized not only among mammals but also across birds.
Aging in context: Age-related changes in context use during language comprehension
Kutas, Marta
, & Soederberg, 1996). At the same time, measures of electrical brain activity (event- related potentials [ERPs
Exploring Age-Related Environmental Attitudes in the Context of Wood Product Certification
Wu, Qinglin
. The context is environmental issues and "green certification" in the forest product industry. Explored of the elderly. Of specific interest is whether or not attitudes about general environmental issues, education, political party, member of environmental organization and race. This work adds to the current
GABAergic systems in a model of age-related cognitive impairment
LaSarge, Candi Lynn
2012-07-16
in learning and memory functions. Confocal stereology was used to determine the number of GABAergic and cholinergic projection neurons in the rostral basal forebrain of spatially characterized young and aged male F344 rats. The GABAergic system...
Running Head: Four modes of selection A Framework for Studying Age-related Change and
Handy, Todd C.
in other modalities follows similar principles. A harsh reality that confronts all students of selective preattentive, inattentional, subconscious, unconscious, and unintentional. The key feature of this type
A Unified Kernel Regression for Diffusion Wavelets on Manifolds Detects Aging-Related
Chung, Moo K.
for constructing wavelets on manifolds using a complicated machinery employed in previous studies [6,7]. Although as a solution to penalized regressions, which significantly differ from our framework that does not have any] that projects the statistical results to a surface for interpretation. 2 Kernel Regression and Wavelets
Behavioral/Systems/Cognitive Age-Related Functional Changes of Prefrontal Cortex in
Wagner, Anthony
, Italy, 4Dipartimento di Fisiologia Umana e Farmacologia, Universita` La Sapienza, I-00185 Roma, Italy, 5
ELECTRICAL STIMULATION REDUCES AGE RELATED ATROPHY AND WEAKNESS IN EDL MUSCLES OF RATS
Dennis, Robert G.
the atrophy and weakness. We electrically stimulated EDL muscles of adult and old rats during a 2 month period of denervation. The control muscles of old rats had declines in muscle mass and maximum force compared with adult control muscles. Denervated muscles of either adult or old rats had even larger declines. Stimulated
Endopolyploidy Changes with Age-Related Polyethism in the Honey Bee, Apis mellifera
Rangel, Juliana; Strauss, Kim; Seedorf, Kaileah; Hjelmen, Carl E.; Johnston, J. Spencer
2015-04-16
capacity in secretory cells. However, changes in endopolyploidy with increased adult worker age and polyethism are unstudied. In this study, we examined endopolyploidy in honey bee workers ranging in age from newly emerged up to 55 days old. We found a...
The Impact of Cognitive Fatigue on Age-Related Differences in Neuromuscular Function
Shortz, Ashley
2015-07-27
As the population of adults aged 65 and above is rapidly growing, it is crucial to identify physical and cognitive limitations pertaining to daily living. The aim of the study was to examine the impact of cognitive fatigue ...
Age-Related Increases in the Shoulder Strength of High School Wrestlers
Housh, Terry J.; Hughes, Rommie J.; Johnson, Glen O.; Housh, Dona J.; Wagner, Loree L.; Weir, Joseph P.; Evans, Sharon A.
1990-01-01
correlations or ratio comparisons for agonist versus antagonist muscle groups (2, 12), dominant versus nondominant arms (5, 12), athletes versus nonathletes (5), or strength values relative to BW or FFW (2, 12). Alderink and Kuck (1) found that the peak torque... the rea- son for the discrepancies is unclear. Alderink and Kuck (1) have suggested that athletes such as pitchers may develop exceptionally strong extensors. This ap- pears not to be the case, however, given the similarity in absolute peak torque values...
Senescence in duckweed: age-related declines in survival, reproduction and offspring quality
Laird, Robert
- nents of fitness (survival, reproduction and offspring quality) in Lemna minor, a small aquatic plant-words: ageing, Lansing effect, Lemna minor, life history, parental age effects Introduction Senescence
Brain site-specific proteome changes in aging-related dementia
Manavalan, Arulmani; Mishra, Manisha; Feng, Lin; Sze, Siu Kwan; Akatsu, Hiroyasu; Heese, Klaus
2013-01-01
Manavalan et al Figure 2 Pie chart depicting the functionalManavalan et al Figure 3 Pie chart depicting the functionalManavalan et al Figure 4 Pie chart depicting the functional
Neurobiology of Aging 26 (2005) 12151227 Age-related alterations in white matter microstructure
Corkin, Suzanne
2005-01-01
.D. Hevelonea, A.K. Zaletaa, B.R. Rosena, B. Fischla,b, S. Corkina,c, H. Diana Rosasa,d, A.M. Dalea,b,e a MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging, Building 149, 13th St., Mail Code 149 (2301
Age-Related Inhibition and Learning Effects: Evidence from Transitive Performance
Bryson, Joanna J.
delays. An older animal that is not be- ing cognitively challenged may be in a sufficiently stable en (Moray House Test) from the 1921 birth cohort from Lothian county, Scotland. After Deary et al. (2004 as little as possible. Put another way, the quality of an animal's existing model should affect its
Age-related breeding biology of the redhead duck in southwestern Manitoba
Johnson, David John
1978-01-01
Research Station, and T. Tacha (of Texas A&M University) who assisted with some phases of field work. The assistance of Dr. F. Guthery (of Texas A&M University) with the statistical analysis of the data is greatly appreciated. This study represented... 33 35 LIST OF FIGURES Figure The aspen parkland of Manitoba (Rowe 1959) Page The Ninnedosa Study Area showing Study Blocks A and B and the roadside transects . . . , . . . . . . . . . . . . . . . . . 5 Female redhead with nasal saddle attached...
Dictionary Learning-based Volumetric Image Classification for The Diagnosis of Age-related
Coenen, Frans
-based approach to supporting the classification of 3D Optical Coherence Tomography (OCT) retinal images, so, Spatial gradient his- tograms, diactioanry learning, Medical image processing, Optical Coher- ence of retinal imagery. Traditionally this is conducted using 2-dimensional (2D) colour fundus images
K. Priyabrat Pandey; Abhishek K. Singh; Sunita Singh; Supriya Kar
2015-04-26
We obtain axionic charged primordial black holes on a vacuum created gravitational pair of $(3{\\bar 3})$-brane by the Kalb-Ramond field on a $D_4$-brane in presence of a background open string metric. The new geometries on an emergent pair of $(3{\\bar 3})$-brane universe is shown to be influenced by the non-perturbative quantum effects underlying a geometric torsion in a second order formalism. The presence of small extra dimensions transverse to the pair in the formalism ensures dynamical scalar fields hidden to a $3$-brane or an anti 3-brane universe. We investigate the non-perturbative quantum vacua for their characteristic properties to explain the accelerated expansion of our universe. Interestingly the emergent brane universe is shown to possess its origin in a degenerate stringy de Sitter vacua at an early epoch. A non-perturbative $D_p$-brane world volume correction for $p < 3$ is worked out to explain some of the quantum effects underlying a quintessence axion in the string-brane setup. Our analysis reveals that a $D$-instanton can be a potential candidate to source the dark energy in our brane universe.
Palanker, Daniel
2013-01-01
restoration to the blind, such as photovoltaic retinal prosthesis, optogenetic and other photoactivation techniques. We compare it with conventional liquid crystal displays (LCD) or digital light processing (DLP only in the online journal) 1. Introduction Retinal degenerative diseases such as age-related macular
could improve asthma treatment page 14 Illuminating Atoms page 18 #12;Science and Technology Facilities improve the treatment of asthma 16 Going beyond the X-ray 18 Max Alexander: Illuminating Atoms 22-related Macular Degeneration (AMD) is the leading cause of sight loss in adults living in the developed world
Borisov, K. Coey, J. M. D.; Stamenov, P.; Alaria, J.
2014-05-07
Single crystals of the metallically degenerate fully magnetic semiconductors CuCr{sub 2}Se{sub 4} and CuCr{sub 2}Se{sub 3}Br have been prepared by the Chemical Vapour Transport method, using either Se or Br as transport agents. The high-quality, millimetre-sized, octahedrally faceted, needle- and platelet-shaped crystals are characterised by means of high field magnetotransport (?{sub 0}H? 14?T) and Point Contact Andreev Reflection. The relatively high spin polarisation observed |P|>0.56, together with the relatively low minority carrier effective mass of 0.25 m{sub e}, and long scattering time 10{sup ?13}?s, could poise these materials for integration in low- and close-to-room temperature minority injection bipolar heterojunction transistor demonstrations.
Menon, Athira; Herwig, Falk; Denissenkov, Pavel A. [Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P5C2 (Canada); Clayton, Geoffrey C.; Staff, Jan [Department of Physics and Astronomy, Louisiana State University, 202 Nicholson Hall, Tower Dr., Baton Rouge, LA 70803-4001 (United States); Pignatari, Marco [Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel (Switzerland); Paxton, Bill [Kavli Institute for Theoretical Physics and Department of Physics, Kohn Hall, University of California, Santa Barbara, CA 93106 (United States)
2013-07-20
The R Coronae Borealis (RCB) stars are hydrogen-deficient, variable stars that are most likely the result of He-CO WD mergers. They display extremely low oxygen isotopic ratios, {sup 16}O/{sup 18}O {approx_equal} 1-10, {sup 12}C/{sup 13}C {>=} 100, and enhancements up to 2.6 dex in F and in s-process elements from Zn to La, compared to solar. These abundances provide stringent constraints on the physical processes during and after the double-degenerate merger. As shown previously, O-isotopic ratios observed in RCB stars cannot result from the dynamic double-degenerate merger phase, and we now investigate the role of the long-term one-dimensional spherical post-merger evolution and nucleosynthesis based on realistic hydrodynamic merger progenitor models. We adopt a model for extra envelope mixing to represent processes driven by rotation originating in the dynamical merger. Comprehensive nucleosynthesis post-processing simulations for these stellar evolution models reproduce, for the first time, the full range of the observed abundances for almost all the elements measured in RCB stars: {sup 16}O/{sup 18}O ratios between 9 and 15, C-isotopic ratios above 100, and {approx}1.4-2.35 dex F enhancements, along with enrichments in s-process elements. The nucleosynthesis processes in our models constrain the length and temperature in the dynamic merger shell-of-fire feature as well as the envelope mixing in the post-merger phase. s-process elements originate either in the shell-of-fire merger feature or during the post-merger evolution, but the contribution from the asymptotic giant branch progenitors is negligible. The post-merger envelope mixing must eventually cease {approx}10{sup 6} yr after the dynamic merger phase before the star enters the RCB phase.
Finn, Amy Sue
2010-01-01
31 Table 2. NEP versus EP …………. ………………………………………………Table 4. NEP and English ………. ……………….………………………………other was maximally distinct (NEP). The MALs shared the same
Gospodaryov, Dmytro V; Yurkevych, Ihor S; Jafari, Mahtab; Lushchak, Volodymyr I; Lushchak, Oleh V
2013-01-01
enhance resistance to heat stress, heavy metals, and redox-by mena- dione, and heat stress. Along with mobility andTo evaluate resistance to heat stress, single flies were
Kahn, Meredith K
2014-11-25
that met or exceeded NRC (2007) requirements. On d 14, horses were challenged with an intra-articular injection of LPS. Carpal joints were randomly assigned to receive 0.5 ng LPS solution obtained from E. coli O55:B5, or 0.8mL sterile lactated Ringer’s...
Hagan, Cindy C.; Graham, Julia M. E.; Tait, Roger; Widmer, Barry; van Nieuwenhuizen, Adrienne O.; Ooi, Cinly; Whitaker, Kirstie J.; Simas, Tiago; Bullmore, Edward T.; Lennox, Belinda R.; Sahakian, Barbara J.; Goodyer, Ian M.; Suckling, John
2015-01-07
, we estimate our power for detecting true significant effects at 0.70. 2.2. Structural MRI (sMRI) data acquisition MR images of all subjects were acquired by a 3.0 Tesla Magnetom Trio Tim scanner (Siemens, Surrey, England) fitted with a quadrature... , gender and handedness) were used to generate a study specific template against which all remaining native grey matter partial volume images were subsequently non-linearly re-registered. Grey matter partial volume images from the subset of subjects were...
Wisconsin at Madison, University of
for constructing wavelets on manifolds using a complicated machinery employed in previous studies [6, 7]. Although as a solution to penalized regressions, which significantly differ from our framework that does not have any] that projects the statistical results to a surface for interpretation. 2 Kernel Regression and Wavelets
Nie,J.; Braverman, J.; Hofmayer, C.; Choun, Y.-S.; Kim, M.K.; Choi, I.-K.
2009-04-02
The Korea Atomic Energy Research Institute (KAERI) and Brookhaven National Laboratory (BNL) are collaborating to develop seismic capability evaluation technology for degraded structures and passive components (SPCs) under a multi-year research agreement. To better understand the status and characteristics of degradation of SPCs in nuclear power plants (NPPs), the first step in this multi-year research effort was to identify and evaluate degradation occurrences of SPCs in U.S. NPPs. This was performed by reviewing recent publicly available information sources to identify and evaluate the characteristics of degradation occurrences and then comparing the information to the observations in the past. Ten categories of SPCs that are applicable to Korean NPPs were identified, comprising of anchorage, concrete, containment, exchanger, filter, piping system, reactor pressure vessel, structural steel, tank, and vessel. Software tools were developed to expedite the review process. Results from this review effort were compared to previous data in the literature to characterize the overall degradation trends.
Mather, Mara
Viewing Positive Pictures Michelle C. Feng, Christopher G. Courtney, Mara Mather, Michael E. Dawson and negative pictures from the International Affective Picture System had opposite effects on startle, with potentiated startle when viewing negative pictures compared to positive pictures. Older adults, on the other
Gospodaryov, Dmytro V; Yurkevych, Ihor S; Jafari, Mahtab; Lushchak, Volodymyr I; Lushchak, Oleh V
2013-01-01
anti-aging properties of resveratrol [1,2], as well as 4-Gems D, Partridge L: Effects of resveratrol on lifespan inR, Zou S: The effect of resveratrol on lifespan depends on
Zheng, Xuan; Zhang, Xinyan; Ding, Lingling; Lee, Jeffrey R.; Weinberger, Paul M.; Dynan, William S.
2014-11-06
High charge and energy (HZE) particles are a main hazard of the space radiation environment. Uncertainty regarding their health effects is a limiting factor in the design of human exploration-class space missions, that is, missions beyond low earth orbit. Previous work has shown that HZE exposure increases cancer risk and elicits other aging-like phenomena in animal models. Here, we investigate how a single exposure to HZE particle radiation, early in life, influences the subsequent age-dependent evolution of oxidative stress and appearance of degenerative tissue changes. Embryos of the laboratory model organism, Oryzias latipes (Japanese medaka fish), were exposed to HZE particle radiation at doses overlapping the range of anticipated human exposure. A separate cohort was exposed to reference ?-radiation. Survival was monitored for 750 days, well beyond the median lifespan. The population was also sampled at intervals and liver tissue was subjected to histological and molecular analysis. HZE particle radiation dose and aging contributed synergistically to accumulation of lipid peroxidation products, which are a marker of chronic oxidative stress. This was mirrored by a decline in PPARGC1A mRNA, which encodes a transcriptional co-activator required for expression of oxidative stress defense genes and for mitochondrial maintenance. Consistent with chronic oxidative stress, mitochondria had an elongated and enlarged ultrastructure. Livers also had distinctive, cystic lesions. Depending on the endpoint, effects of ?-rays in the same dose range were either lesser or not detected. Results provide a quantitative and qualitative framework for understanding relative contributions of HZE particle radiation exposure and aging to chronic oxidative stress and tissue degeneration.
Ji Suoqing; Fisher, Robert T. [University of Massachusetts Dartmouth, Department of Physics, 285 Old Westport Road, North Dartmouth, MA 02740 (United States); Garcia-Berro, Enrique [Departament de Fisica Aplicada, Universitat Politecnica de Catalunya, c/Esteve Terrades, 5, E-08860 Castelldefels (Spain); Tzeferacos, Petros; Jordan, George; Lee, Dongwook [Center for Astrophysical Thermonuclear Flashes, The University of Chicago, Chicago, IL 60637 (United States); Loren-Aguilar, Pablo [School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL (United Kingdom); Cremer, Pascal [Bethe Center for Theoretical Physics, Universitaet Bonn, Nussallee 12, D-53115 Bonn (Germany); Behrends, Jan [Fachbereich Physik, Freie Universitaet Berlin, Arnimallee 14, D-14195 Berlin (Germany)
2013-08-20
Type Ia supernovae (SNe Ia) play a crucial role as standardizable cosmological candles, though the nature of their progenitors is a subject of active investigation. Recent observational and theoretical work has pointed to merging white dwarf binaries, referred to as the double-degenerate channel, as the possible progenitor systems for some SNe Ia. Additionally, recent theoretical work suggests that mergers which fail to detonate may produce magnetized, rapidly rotating white dwarfs. In this paper, we present the first multidimensional simulations of the post-merger evolution of white dwarf binaries to include the effect of the magnetic field. In these systems, the two white dwarfs complete a final merger on a dynamical timescale, and are tidally disrupted, producing a rapidly rotating white dwarf merger surrounded by a hot corona and a thick, differentially rotating disk. The disk is strongly susceptible to the magnetorotational instability (MRI), and we demonstrate that this leads to the rapid growth of an initially dynamically weak magnetic field in the disk, the spin-down of the white dwarf merger, and to the subsequent central ignition of the white dwarf merger. Additionally, these magnetized models exhibit new features not present in prior hydrodynamic studies of white dwarf mergers, including the development of MRI turbulence in the hot disk, magnetized outflows carrying a significant fraction of the disk mass, and the magnetization of the white dwarf merger to field strengths {approx}2 Multiplication-Sign 10{sup 8} G. We discuss the impact of our findings on the origins, circumstellar media, and observed properties of SNe Ia and magnetized white dwarfs.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Zheng, Xuan; Zhang, Xinyan; Ding, Lingling; Lee, Jeffrey R.; Weinberger, Paul M.; Dynan, William S.
2014-11-06
High charge and energy (HZE) particles are a main hazard of the space radiation environment. Uncertainty regarding their health effects is a limiting factor in the design of human exploration-class space missions, that is, missions beyond low earth orbit. Previous work has shown that HZE exposure increases cancer risk and elicits other aging-like phenomena in animal models. Here, we investigate how a single exposure to HZE particle radiation, early in life, influences the subsequent age-dependent evolution of oxidative stress and appearance of degenerative tissue changes. Embryos of the laboratory model organism, Oryzias latipes (Japanese medaka fish), were exposed to HZEmore »particle radiation at doses overlapping the range of anticipated human exposure. A separate cohort was exposed to reference ?-radiation. Survival was monitored for 750 days, well beyond the median lifespan. The population was also sampled at intervals and liver tissue was subjected to histological and molecular analysis. HZE particle radiation dose and aging contributed synergistically to accumulation of lipid peroxidation products, which are a marker of chronic oxidative stress. This was mirrored by a decline in PPARGC1A mRNA, which encodes a transcriptional co-activator required for expression of oxidative stress defense genes and for mitochondrial maintenance. Consistent with chronic oxidative stress, mitochondria had an elongated and enlarged ultrastructure. Livers also had distinctive, cystic lesions. Depending on the endpoint, effects of ?-rays in the same dose range were either lesser or not detected. Results provide a quantitative and qualitative framework for understanding relative contributions of HZE particle radiation exposure and aging to chronic oxidative stress and tissue degeneration.« less
Mitochondrial Transport and Function in Axon Degeneration
O'Donnell, Kelley
2013-01-01
encephalomyelitis and multiple sclerosis. Nat Med 17:495-encephalomyelitis and multiple sclerosis. Nat Med 17:495-
Mitochondrial Transport and Function in Axon Degeneration
O'Donnell, Kelley
2013-01-01
Koyano F, Funayama M, Shiba-Fukushima K, Sato S, Shimizu H,Koyano F, Funayama M, Shiba-Fukushima K, Sato S, Shimizu H,
Mitochondrial Transport and Function in Axon Degeneration
O'Donnell, Kelley
2013-01-01
The antioxidant compound resveratrol increases activity ofet al. , 2008). Resveratrol increases both activation andMudò et al. , 2012). Resveratrol mimics this protective
2011-01-01
telomerase, stress, and aging. In: Benton, GG. ; Cacioppo,7. Edo MD, Andres V. Aging, telomeres, and atherosclerosis.for accelerated cellular aging? Hormones (Athens). 2009; 8:
Wang, Jiying [Department of Ophthalmology and Visual Science, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519 (Japan)] [Department of Ophthalmology and Visual Science, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519 (Japan); Ohno-Matsui, Kyoko, E-mail: k.ohno.oph@tmd.ac.jp [Department of Ophthalmology and Visual Science, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519 (Japan)] [Department of Ophthalmology and Visual Science, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519 (Japan); Morita, Ikuo [Section of Cellular Physiological Chemistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519 (Japan)] [Section of Cellular Physiological Chemistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519 (Japan)
2012-08-10
Highlights: Black-Right-Pointing-Pointer Cholesterol-treated RPE produces more A{beta} than non-treated RPE. Black-Right-Pointing-Pointer Neprilysin expression and activity decreased in cholesterol-treated RPE. Black-Right-Pointing-Pointer {alpha}-Secretase expression and activity decreased in cholesterol-treated RPE. Black-Right-Pointing-Pointer Cholesterol-enriched diet induced subRPE deposits in aged mice. Black-Right-Pointing-Pointer A{beta} were present in cholesterol-enriched-diet-induced subRPE deposits in aged mice. -- Abstract: Subretinally-deposited amyloid {beta} (A{beta}) is a main contributor of developing age-related macular degeneration (AMD). However, the mechanism causing A{beta} deposition in AMD eyes is unknown. Hypercholesterolemia is a significant risk for developing AMD. Thus, we investigated the effects of cholesterol on A{beta} production in retinal pigment epithelial (RPE) cells in vitro and in the mouse retina in vivo. RPE cells isolated from senescent (12-month-old) C57BL/6 mice were treated with 10 {mu}g/ml cholesterol for 48 h. A{beta} amounts in culture supernatants were measured by ELISA. Activity and expression of enzymes and proteins that regulate A{beta} production were examined by activity assay and real time PCR. The retina of mice fed cholesterol-enriched diet was examined by transmission electron microscopy. Cholesterol significantly increased A{beta} production in cultured RPE cells. Activities of A{beta} degradation enzyme; neprilysin (NEP) and anti-amyloidogenic secretase; {alpha}-secretase were significantly decreased in cell lysates of cholesterol-treated RPE cells compared to non-treated cells, but there was no change in the activities of {beta}- or {gamma}-secretase. mRNA levels of NEP and {alpha}-secretase (ADAM10 and ADAM17) were significantly lower in cholesterol-treated RPE cells than non-treated cells. Senescent (12-month-old) mice fed cholesterol-enriched chow developed subRPE deposits containing A{beta}, whereas age-matched mice fed standard rodent chow diet did not. Activities and mRNA levels of NEP and {alpha}-secretase were significantly lower in native RPE cells freshly isolated from cholesterol-enriched chow fed mice compared to standard rodent chow fed mice. These findings suggest that cholesterol enhances subretinal A{beta} accumulation by modulating the activities of enzymes degrading and processing A{beta} in RPE cells in senescent subjects.
Magnetic Fields in Quantum Degenerate Systems and in Vacuum
H. Perez Rojas; E. Rodriguez Querts
2006-12-28
We consider self-magnetization of charged and neutral vector bosons bearing a magnetic moment in a gas and in vacuum. For charged vector bosons (W bosons) a divergence of the magnetization in both the medium and the electroweak vacuum occurs for the critical field B=B_{wc}=m_{w}^{2}/e. For B>B_{wc} the system is unstable. This behavior suggests the occurrence of a phase transition at B=B_{c}, where the field is self-consistently maintained. This mechanism actually prevents $B$ from reaching the critical value B_{c}. For virtual neutral vector bosons bearing an anomalous magnetic moment, the ground state has a similar behavior for B=B_{nbc}=m_{nb}^{2}/q . The magnetization in the medium is associated to a Bose-Einstein condensate and we conjecture a similar condensate occurs also in the case of vacuum. The model is applied to virtual electron-positron pairs bosonization in a magnetic field B \\sim B_{pc}\\lesssim 2m_{e}^{2}/e, where m_e is the electron mass. This would lead also to vacuum self-magnetization in QED, where in both cases the symmetry breaking is due to a condensate of quasi-massless particles.
A Solvable Two-Dimensional Degenerate Singular Stochastic Control Problem
Sidorov, Nikita
. The optimisation is motivated by a storage-consumption model in an electricity market, and features a stochastic investment; electricity market. MSC2010 subsject classification: 91B70, 93E20, 60G40, 49L20. 1 Introduction of electricity markets. Here the first component of the state process is the electricity spot price, represented
A minimum problem with free boundary for a degenerate quasilinear ...
2005-03-04
Feb 8, 2005 ... By the strong minimum principle, w0 = 0 in B5/8, since w0 ? 0 and w0(0) ..... 4.7 in [2] and pp. 19–20 in [3]; see also our proof of Theorem 5.1.
Classical and quantum linearized descriptions of degenerate optomechanical parametric oscillators
Sebastian Pina-Otey; Fernando Jiménez; Peter Degenfeld-Schonburg; Carlos Navarrete-Benlloch
2015-08-26
Recent advances in the development of modern quantum technologies have opened the possibility of studying the interplay between spontaneous parametric down-conversion and optomechanics, two of the most fundamental nonlinear optical processes. Apart from practical reasons, such scenario is very interesting from a fundamental point of view, because it allows exploring the optomechanical interaction in the presence of a strongly quantum-correlated field, the down-converted mode. In this work we analyze such problem from two approximate but valuable perspectives: the classical limit and the limit of small quantum fluctuations. We show that, in the presence of optomechanical coupling, the well-known classical phase diagram of the optical problem gets modified by the appearance of new dynamical instabilities. As for the quantum-mechanical description, we prove the ability of the squeezed down-converted field to cool down the mechanical motion not only to thermal but also to squeezed mechanical states, and in a way that can be much less sensitive to parameters (e.g., detuning of the driving laser) than standard sideband cooling.
DISCRETE DUALITY FINITE VOLUME SCHEMES FOR DOUBLY NONLINEAR DEGENERATE
operators 17 3.4. Penalization operator 19 3.5. Discrete convection operator 20 3.6. Projection operators establish the existence and uniqueness of entropy solutions. We then turn to the construction and analysis and well-posedness 5 3. Discrete duality finite volume (DDFV) schemes 13 3.1. Construction of "double
Contemporary Mathematics Local Estimates for Solutions to Singular and Degenerate
O'Leary, Michael
Parabolic Equations Mike O'Leary 1. Introduction and Results We shall obtain Lq,loc(T ) and L-8218-1196-7-03551-9 c 1999 American Mathematical Society 241 #12;2 MIKE O'LEARY Theorem 1. Let u be a weak solution
The signature of single-degenerate accretion-induced collapse
Piro, Anthony L. [Theoretical Astrophysics, California Institute of Technology, 1200 East California Boulevard, M/C 350-17, Pasadena, CA 91125 (United States); Thompson, Todd A., E-mail: piro@caltech.edu [Department of Astronomy and Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210 (United States)
2014-10-10
The accretion-induced collapse (AIC) of a white dwarf to a neutron star has long been suggested as a natural theoretical outcome in stellar evolution, but there has never been a direct detection of such an event. This is not surprising since the small amount of radioactive nickel synthesized (?10{sup –3} M {sub ?}) implies a relatively dim optical transient. Here we argue that a particularly strong signature of an AIC would occur for an oxygen-neon-magnesium (ONeMg) white dwarf accreting from a star that is experiencing Roche-lobe overflow as it becomes a red giant. In such cases, the ?10{sup 50} erg explosion from the AIC collides with and shock-heats the surface of the extended companion, creating an X-ray flash lasting ?1 hr followed by an optical signature that peaks at an absolute magnitude of ? – 16 to –18 and lasts for a few days to a week. These events would be especially striking in old stellar environments where hydrogen-rich supernova-like transients would not normally be expected. Although the rate of such events is not currently known, we describe observing strategies that could be utilized with high cadence surveys that should either detect these events or place strong constraints on their rates.
Toric degenerations of Bezier patches Luis David Garcia-Puente
Sottile, Frank
and Frank Sottile Texas A&M University and Chungang Zhu Dalian University of Technology The control polygon, Dalian University of Technology, Dalian 116024, China. Permission to make digital or hard copies of part
RESEARCH REPORT Limbic and Frontal Cortical Degeneration Is Associated
Gaser, Christian
, and Ferdinand Binkofski Background: Mutations in the PINK1 gene can cause Parkinson's disease and are frequently: Hippocampus, Parkinson's disease, PINK1, psychiatric disorders, voxel-based morphometry P arkinson's disease of the psychiatric disease was also correlated with the extent of limbic and frontal gray matter volume decrease
On the Porosity of Free Boundaries in Degenerate Variational ...
Karp, L., et al.
2000-05-25
Department of Applied Mathematics, International College of Technology, ... Department of Mathematics, Royal Institute of Technology, 100 44 Stockholm, ...
Degenerate resistive switching and ultrahigh density storage in resistive memory
Lohn, Andrew J., E-mail: drewlohn@gmail.com; Mickel, Patrick R., E-mail: prmicke@sandia.gov; James, Conrad D.; Marinella, Matthew J. [Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
2014-09-08
We show that in tantalum oxide resistive memories, activation power provides a multi-level variable for information storage that can be set and read separately from the resistance. These two state variables (resistance and activation power) can be precisely controlled in two steps: (1) the possible activation power states are selected by partially reducing resistance, then (2) a subsequent partial increase in resistance specifies the resistance state and the final activation power state. We show that these states can be precisely written and read electrically, making this approach potentially amenable for ultra-high density memories. We provide a theoretical explanation for information storage and retrieval from activation power and experimentally demonstrate information storage in a third dimension related to the change in activation power with resistance.
Row-Reduced Column Generation for Degenerate Master Problems
2013-02-06
Feb 5, 2013 ... node of a search tree, and often produces strong dual bounds. ... In linear algebra terms, we work with a projection ... enter the current basis.
A POSTERIORI ERROR ESTIMATION AND ADAPTIVITY FOR DEGENERATE PARABOLIC PROBLEMS
Nochetto, Ricardo H.
, lumping matrix, compartmental system MSC 80A30, 93Bxx, 34A30 1 Introduction Dealing with modeling of real
Universal dynamics of a degenerate unitary Bose gas
Makotyn, Philip; Goldberger, David L; Cornell, Eric A; Jin, Deborah S
2013-01-01
Understanding the rich behavior that emerges from systems of interacting quantum particles, such as electrons in materials, nucleons in nuclei or neutron stars, the quark-gluon plasma, and superfluid liquid helium, requires investigation of systems that are clean, accessible, and have tunable parameters. Ultracold quantum gases offer tremendous promise for this application largely due to an unprecedented control over interactions. Specifically, $a$, the two-body scattering length that characterizes the interaction strength, can be tuned to any value. This offers prospects for experimental access to regimes where the behavior is not well understood because interactions are strong, atom-atom correlations are important, mean-field theory is inadequate, and equilibrium may not be reached or perhaps does not even exist. Of particular interest is the unitary gas, where $a$ is infinite, and where many aspects of the system are universal in that they depend only on the particle density and quantum statistics. While t...
Tools for primal degenerate linear programs: IPS, DCA, and PE
2014-10-01
the selection of a compatible variable to enter the basis ensures a nondegenerate pivot, PE .... At the heart of this framework lies the search for so-
Imaging system to assess objectively the optical density of the macular pigment in vivo
Dainty, Chris
electronics, a collection of image-processing techniques, and a graphical user interface. The deficiencies in a laboratory-based environment. © 2013 Optical Society of America OCIS codes: (100.0100) Image processing; (170 that the fundamental procedure of incorporation of the carotenoids into the retinal tissues is still relatively poorly
Impact of degenerate n-doping on the optical absorption edge in transparent conducting cadmium oxide
Schleife, André
n-type or can be heavily doped. Transparent conductive cadmium oxide (CdO) thin films, for instance in the conduction bands of CdO can increase the conductivity up to values desired for technological applications, have been known at least since 1907 and, in that sense, CdO can be seen as a pioneering TCO.1 Pure bulk
Computational molecular phenotyping of retinal sheet transplants to rats with retinal degeneration
Seiler, MJ; Jones, BW; Aramant, RB; Yang, PB; Keirstead, HS; Marc, RE
2012-01-01
nuclei; 10 seconds of uranyl acetate stain. (B) Enlargementto ribbon synapse. Ten seconds of uranyl acetate stain. (E)adjacent section. Ten seconds of uranyl acetate stain. (G)
Data embedding employing degenerate clusters of data having differences less than noise value
Sanford, II, Maxwell T. (Los Almos, NM); Handel, Theodore G. (Los Almos, NM)
1998-01-01
A method of embedding auxiliary information into a set of host data, such as a photograph, television signal, facsimile transmission, or identification card. All such host data contain intrinsic noise, allowing pixels in the host data which are nearly identical and which have values differing by less than the noise value to be manipulated and replaced with auxiliary data. As the embedding method does not change the elemental values of the host data, the auxiliary data do not noticeably affect the appearance or interpretation of the host data. By a substantially reverse process, the embedded auxiliary data can be retrieved easily by an authorized user.
Characterization of RPGR Variants and Their Role in Inherited Retinal Degeneration
Wright, Rachel
2012-10-19
about the physiological significance of expressing two distinct groups of variants. This study compares Rpgr^ex1-19 and Rpgr^ORF15 expression in developing photoreceptors using immunoblot analysis and immunohistochemistry, assesses ciliary affinity...
Data embedding employing degenerate clusters of data having differences less than noise value
Sanford, M.T. II; Handel, T.G.
1998-10-06
A method of embedding auxiliary information into a set of host data, such as a photograph, television signal, facsimile transmission, or identification card. All such host data contain intrinsic noise, allowing pixels in the host data which are nearly identical and which have values differing by less than the noise value to be manipulated and replaced with auxiliary data. As the embedding method does not change the elemental values of the host data, the auxiliary data do not noticeably affect the appearance or interpretation of the host data. By a substantially reverse process, the embedded auxiliary data can be retrieved easily by an authorized user. 35 figs.
Doping against the Native Propensity of MoS2: Degenerate Hole Doping by Cation Substitution
Wu, Junqiao
attention as the key semiconducting material for two- dimensional electrical, optoelectronic, and spintronic rectification. A wide range of microelectronic, optoelectronic, and spintronic devices can be envisioned from
Temperature dependence of the spin relaxation in highly degenerate ZnO thin films
Prestgard, M. C.; Siegel, G.; Tiwari, A.; Roundy, R.; Raikh, M.
2015-02-28
Zinc oxide is considered a potential candidate for fabricating next-generation transparent spintronic devices. However, before this can be achieved, a thorough scientific understanding of the various spin transport and relaxation processes undergone in this material is essential. In the present paper, we are reporting our investigations into these processes via temperature dependent Hanle experiments. ZnO thin films were deposited on c-axis sapphire substrates using a pulsed laser deposition technique. Careful structural, optical, and electrical characterizations of the films were performed. Temperature dependent non-local Hanle measurements were carried out using an all-electrical scheme for spin injection and detection over the temperature range of 20–300?K. From the Hanle data, spin relaxation time in the films was determined at different temperatures. A detailed analysis of the data showed that the temperature dependence of spin relaxation time follows the linear-in-momentum Dyakonov-Perel mechanism.
Palanker, Daniel
photovoltaic arrays Jacob G. Light a, b , James W. Fransen c , Adewumi N. Adekunle a , Alice Adkins b , Gobinda: Retina Prosthetic Bipolar cells Amacrine cells Müller glial cells a b s t r a c t Photovoltaic arrays
STABILITY OF TRAVELING WAVES FOR DEGENERATE SYSTEMS OF REACTION DIFFUSION EQUATIONS
Latushkin, Yuri
-diffusion system at a traveling pulse or front, we prove a theorem that allows one to derive information about in neurons; certain combustion models [9]; population models in which some species diffuse and others do Classification. 47D06, 35K57, 35B40. Key words and phrases. front, pulse, spectrally stable, linearly stable, C0
Role of activity in neuromuscular synaptic degeneration: insights from Wlds mice
Brown, Rosalind
2012-06-22
The nervous system is a dynamic structure. Both during development and in the adult, synapses display activity-dependent plasticity which can modify their structure and function. In the neonate, activity influences the ...
Antiferromagnetic Exchange Interaction between Electrons on Degenerate LUMOs in Benzene Dianion
Matsuura, Hiroyasu; Fukuyama, Hidetoshi
2012-01-01
We discuss the ground state of Benzene dianion (Bz$^{2-}$) on the basis of the numerical diagonalization method of an effective model of $\\pi$ orbitals. It is found that the ground state can be the spin singlet state, and the exchange coupling between LUMOs can be antiferromagnetic.
Non-degenerate magnetic alignment of self-assembled mesophases Pawel W. Majewski* Chinedum O. Osuji
Haller, Gary L.
and photonic crystals24 to high-density storage media5,6 and templates for materials synthesis.79 In many) offer promise as a flexible tool for nanostructure alignment in these systems. They circumvent be conveniently applied over macroscopic length scales (> 10 cm) and to geometries or devices that are ill
Research Recruiting Endogenous Tissue Stem Cells to Repair Injury and Degeneration
Peterson, Daniel A.
2014-10-22
This report lists bibliographic information about meeting papers and journal articles resulting from this work, and basic information on new grant applications that this work was used to support.
Hickox, Ann E
2013-01-01
Perceptual abnormalities such as hyperacusis and tinnitus often occur following acoustic overexposure. Although such exposure can also result in permanent threshold elevation, some individuals with noise-induced hyperacusis ...
A generalization of Frenet's frame for non-degenerate quadratic forms
Henri PoincarÃ© -Nancy-UniversitÃ©, UniversitÃ©
construction to any pseudo-Riemannian manifold. R#19;esum#19;e La construction du rep#18;ere de Fr#19;enet
Self-Ordered stationary states of driven quantum degenerate gases in optical resonators
Raimar M. Sandner; Wolfgang Niedenzu; Francesco Piazza; Helmut Ritsch
2015-07-05
We study the role of quantum statistics in the self-ordering of ultracold bosons and fermions moving inside an optical resonator with transverse coherent pumping. For few particles we numerically compute the nonequilibrium dynamics of the density matrix towards the self-ordered stationary state of the coupled atom-cavity system. We include quantum fluctuations of the particles and the cavity field. These fluctuations in conjunction with cavity cooling determine the stationary distribution of the particles, which exhibits a transition from a homogeneous to a spatially ordered phase with the appearance of a superradiant scattering peak in the cavity output spectrum. At the same time the cavity field $Q$-function changes from a single to a double peaked distribution. While the ordering threshold is generally lower for bosons, we confirm the recently predicted zero pump strength threshold for superradiant scattering for fermions when the cavity photon momentum coincides with twice the Fermi momentum.
J. Am. Chem. SOC.1991, 113, 3451-3458 3451 Degenerate Transesterification of
Smith, Bradley D.
between lithium 3,5-dimethylphenolate-d6and a series of 3,5-dimethyIphenyl esters have been determined-tetrahydrofuroate, 2-furoate, (N,N-dimethylamino)acetate,(methylthio)acetate, 2- and 4-pyridine- carboxylates,2. These results are interpreted in terms of a preequilibrium in which a solventon lithium in the tetramer
High-efficiency degenerate four-wave mixing in triply resonant nanobeam cavities
Lin, Zin
Using a combination of temporal coupled-mode theory and nonlinear finite-difference time-domain (FDTD) simulations, we study the nonlinear dynamics of all-resonant four-wave mixing processes and demonstrate the possibility ...
Integrability and Boundedness of Local Solutions to Singular and Degenerate Quasilinear Parabolic
O'Leary, Michael
Equations Mike O'Leary Abstract Integral and supremum estimates are proven for local solutions of de- 1 ) + c5|u|-1 + 2(x, t), AMS Classifications: 35K65, 35B45 Mike O'Leary, Department of Mathematics, Towson University, Towson, MD 21252 moleary@towson.edu #12;2 M. O'Leary (H5) 1 L p p-1 ,loc(T ), (H6) o
2007-01-01
in Alzheimer’s disease causes neuronal death. FASEB J. 2001;Manuscript Figure 1. UbB + 1 causes neuritic beading andfound in Alzheimer’s disease causes neuritic beading of
Wong, Benjamin L.
2009-01-01
In: Basic Orthopaedic Biomechanics, ed. by VC Mow, Hayes WC,In: Basic Orthopaedic Biomechanics and Mechano- Biology, ed.In: Basic Orthopaedic Biomechanics, ed. by VC Mow, Hayes WC,
Alexey Novikov; Mikhail Ovchinnikov
2008-05-27
In this paper we considered a quantum particle moving through delute Bose-Einstein condensate at zero temperature. In our formulation the impurity particle interacts with the gas of uncoupled Bogoliubov's excitations. We constructed the perturbation theory for the Green's function of the impurity particle with respect to the impurity-condensate interaction employing the coherent-state path integral approach. The perturbative expansion for the Green's function is resumed into the expansion for its poles with the help of the diagrammatic technique developed in this work. The dispersion relation for the impurity clothed by condensate excitations is obtained and effective mass is evaluated beyond the Golden rule approximation.
Ciliopathies : molecular and genetic basis for Ahi1 function in retinal degeneration
Louie, Carrie MC
2010-01-01
to classic JS. Ahi1 and oncogenesis Though the Ahi1 locus indirectly contributes to oncogenesis. Jiang et. al. foundhas been associated with oncogenesis in specific forms of
Degenerate ground-state lattices of membrane inclusions K. S. Kim,1
Levine, Alex J.
- angular or square 1 . In this paper, we consider the total bending energy of infinite, doubly periodic bending if they impose a nonzero angle of contact. This bending mediates complicated effective particle of particles with specific configurations that give rise to zero total membrane bending energy. Here, we
NEAR DEGENERATE REARRANGEMENT BETWEEN THE RADICAL CATIONS OF FORMALDEHYDE AND HYDROXYMETHYLENE
Osamura, Y.
2010-01-01
THE RADICAL CATIONS OF FORMALDEHYDE AND HYDROXYMETHYLENEthe Radical Cations of Formaldehyde and Hydroxymethylenethan the anticipated formaldehyde radical cation H CO+. This
Mind the edge! The role of adjacency matrix degeneration in maximum entropy weighted network models
Sagarra, Oleguer; Díaz-Guilera, Albert
2015-01-01
Complex network null models based on entropy maximization are becoming a powerful tool to characterize and analyze data from real systems. However, it is not easy to extract good and unbiased information from these models: A proper understanding of the nature of the underlying events represented in them is crucial. In this paper we emphasize this fact stressing how an accurate counting of configurations compatible with given constraints is fundamental to build good null models for the case of networks with integer valued adjacency matrices constructed from aggregation of one or multiple layers. We show how different assumptions about the elements from which the networks are built give rise to distinctively different statistics, even when considering the same observables to match those of real data. We illustrate our findings by applying the formalism to three datasets using an open-source software package accompanying the present work and demonstrate how such differences are clearly seen when measuring networ...
Observation of an Interedge Magnetoplasmon Mode in a Degenerate Two-Dimensional Electron Gas
Hohls, Frank
detection of edge states in the quantum Hall regime. At filling factors close to 3 we observe two densities was experimentally observed up to now only in a classical system of surface electrons on helium [9 magnetoplasmons. Using selective detection of edge states we can distinguish two wave packets of edge excitations
Fluctuations and state preparation in quantum degenerate gases of sodium and lithium
Su, Edward (Edward Joseph)
2014-01-01
Ultracold atoms enable the precise study of novel systems where the correlations between particles are strong. These systems can be simple to describe yet impossible to efficiently simulate on a classical computer; ...
Level set simulations of turbulent thermonuclear deflagration in degenerate carbon and oxygen
W. Schmidt; W. Hillebrandt; J. C. Niemeyer
2005-08-02
We study the dynamics of thermonuclear flames propagating in fuel stirred by stochastic forcing. The fuel consists of carbon and oxygen in a state which is encountered in white dwarfs close to the Chandrasekhar limit. The level set method is applied to represent the flame fronts numerically. The computational domain for the numerical simulations is cubic, and periodic boundary conditions are imposed. The goal is the development of a suitable flame speed model for the small-scale dynamics of turbulent deflagration in thermonuclear supernovae. Because the burning process in a supernova explosion is transient and spatially inhomogeneous, the localised determination of subgrid scale closure parameters is essential. We formulate a semi-localised model based on the dynamical equation for the subgrid scale turbulence energy $k_{\\mathrm{sgs}}$. The turbulent flame speed $s_{\\mathrm{t}}$ is of the order $\\sqrt{2k_{\\mathrm{sgs}}}$. In particular, the subgrid scale model features a dynamic procedure for the calculation of the turbulent energy transfer from resolved toward subgrid scales, which has been successfully applied to combustion problems in engineering. The options of either including or suppressing inverse energy transfer in the turbulence production term are compared. In combination with the piece-wise parabolic method for the hydrodynamics, our results favour the latter option. Moreover, different choices for the constant of proportionality in the asymptotic flame speed relation, $s_{\\mathrm{t}}\\propto\\sqrt{2k_{\\mathrm{sgs}}}$, are investigated.
A degenerating PDE system for phase transitions and damage Elisabetta Rocca
Rossi, Riccarda
, 45N05, 80A22, 76S05. #12;2 Barbu Colli Gilardi Grasselli 1. Introduction The present analysis
LiNaK : multi-species apparatus for the study of ultracold quantum degenerate mixtures
Santiago González, Ibon
2012-01-01
This thesis describes the construction of a versatile apparatus to study ultracold quantum mixtures capable of simultaneously cooling fermionic ?Li and ??K, as well as the bosonic ?¹K. The main features of the experimental ...
Phospholipase A2 inhibitors protect against prion and Abeta mediated synapse degeneration
Bate, Clive; Tayebi, Mourad; Williams, Alun
2010-04-08
. Neurotox Res 2010, 17(3):203-214. 9. Lipton AM, Cullum CM, Satumtira S, Sontag E, Hynan LS, White CL, Bigio EH: Contribution of asymmetric synapse loss to lateralizing clinical deficits in frontotemporal dementias. Arch Neurol 2001, 58(8):1233-1239. 10... , Williams A: Ginkgolides protect against amyloid-?1-42- mediated synapse damage in vitro. Mol Neurodegen 2008, 3(1):1. 28. Podlisny MB, Ostaszewski BL, Squazzo SL, Koo EH, Rydell RE, Teplow DB, Selkoe DJ: Aggregation of secreted amyloid ?...
Wong, Benjamin L.
2009-01-01
of a subchondral bone perforation on the load supportPerforations . 203subchondral bone plate perforation. Trans Orthop Res Soc 31:
TWINS: THE TWO SHORTEST PERIOD NON-INTERACTING DOUBLE DEGENERATE WHITE
Office of Scientific and Technical Information (OSTI)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail. (Conference)Feedback SystemGimbaled X-Ray HeadSTRATIFICATION EFFECTS (JournalDWARF
Shore, S N; Wahlgren, G M
2011-01-01
We present some results of an ongoing study of the long-term spectroscopic variations of AG Dra, a prototypical eruptive symbiotic system. We discuss the effects of the environment and orbital modulation in this system and some of the physical processes revealed by a comparison with the nova outburst of the symbiotic-like recurrent nova V407 Cyg 2010.
Bazalii, B V; Degtyarev, S P
2013-07-31
An elliptic boundary-value problem for second-order equations with nonnegative characteristic form is investigated in the situation when there is a weak degeneracy on the boundary of the domain. A priori estimates are obtained for solutions and the problem is proved to be solvable in some weighted Hölder spaces. Bibliography: 18 titles.
Palanker, Daniel
Performance of photovoltaic arrays in-vivo and characteristics of prosthetic vision in animals neurons. Subretinal photovoltaic arrays convert pulsed illumination into pulsed electric current
J. Farihi; E. E. Becklin; B. Zuckerman
2008-05-13
This paper presents a sensitive and comprehensive IRAC 3-8 $\\mu$m photometric survey of white dwarfs for companions in the planetary mass regime with temperatures cooler than the known T dwarfs. The search focuses on descendents of intermediate mass stars with $M\\ga3$ $M_{\\odot}$ whose inner, few hundred AU regions cannot be probed effectively for massive planets and brown dwarfs by any alternative existing method. Furthermore, examination for mid-infrared excess explores an extensive range of orbital semimajor axes, including the intermediate 5-50 AU range poorly covered and incompletely accessible by other techniques at main sequence or evolved stars. Three samples of white dwarfs are chosen which together represent relatively young as well as older populations of stars: 9 open cluster white dwarfs, 22 high mass field white dwarfs, and 17 metal-rich field white dwarfs. In particular, these targets include: 7 Hyads and 4 field white dwarfs of similar age; 1 Pleiad and 19 field white dwarfs of similar age; van Maanen 2 and 16 similarly metal-rich white dwarfs with ages between 1 and 7 Gyr. No substellar companion candidates were identified at any star. By demanding a 15% minimum photometric excess at 4.5 $\\mu$m to indicate a companion detection, upper limits in the planetary mass regime are established at 34 of the sample white dwarfs, 20 of which have limits below 10 $M_{\\rm J}$ according to substellar cooling models. Specifically, limits below the minimum mass for deuterium burning are established at all Pleiades and Hyadeswhite dwarfs, as well as similarly young field white dwarfs, half a dozen of which receive limits at or below 5 $M_{\\rm J}$. Two IRAC epochs at vMa 2 rule out $T\\ga200$ K proper motion companions within 1200 AU.
-pressure argon arc plasma 4 . Like TPPS, the PCDFWM method is characterized by high spatial and tem- poral are calculated for high-density Ne 1021 m-3 plasma conditions and for different contributions of the Doppler are widely studied in astrophysics and laboratory plasma physics 1 . The measurements of the Stark profiles
Thompson, Paul
. Leow a,b , Yi-Yu Chou a , April J. Ho a , Boris Gutman a , Arthur W. Toga a , Clifford R. Jack Jr d,j , Gene E. Alexander l , Michael W. Weiner i,j,k,l , Paul M. Thompson a, and the Alzheimer's Disease
2009-01-01
the efficacy of a direct injection of ADAMTS5 siRNA into theAF. In addition, the direct injection of siRNA into the NP
Jahanshad, Neda
2012-01-01
iii The dissertation of Neda Jahanshad is approved. Arthur52(2), 455–69. Jahanshad, Neda, Aganj, Iman, Lenglet,studies. Beau K. Nakamoto and Neda Jahanshad contributed
CVS Caremark Specialty Pharmacy
degeneration · Multiple sclerosis · Oncology · Osteoarthritis · Osteoporosis · Psoriasis · Pulmonary arterial
2012-01-01
rich plasma and biodegradable gelatin hydrogel microspheres.plasma and biodegradable gelatin hydrogel microspheres onimpregnated biodegradable gelatin hydrogel microspheres (
Jackson, David
production and photosynthetic rates within and outside a cyclonic mesoscale eddy in the North Pacific
E. M. Lipmanov
2008-10-01
The absolute neutrino masses and type of neutrino mass hierarchy are among the main problems in neutrino physics. Top-quark mass is another topical problem in particle physics. These problems extend the old puzzle of electron-muon mass ratio close to the fine structure constant, which is still not solved by known theory. Here I continue the search for a general flavor pattern that may incorporate these problems. Relations between neutrino/electron and electron/top-quark pole mass ratios are obtained from supposition that realistic elementary particle dimensionless bare flavor quantities are small deviated (measured by universal parameter e) from the values of a stated flavor pattern (at e=0) and experimental data hints. With the world average t-quark mass data the sum of QD-neutrino masses is estimated (0.50 +- 0.003)eV in agreement with cosmological constraints and known QD-neutrino mass estimations from experimental data on neutrino oscillation mass-squared differences.
Quantum Opt. 2 (1990) 307-321. Printed in the UK The degenerate four-wave mixer:SU(1,l) symmetry and
Teich, Malvin C.
1990-01-01
and photon statistics Faige Singer?, Richard A Campos$, Malvin C Teich§ and Bahaa E A Saleh11 t Department of photon statistics. We examine these statistics at its output in terms of the matrix representation, in particularsqueezedstates [l-51. The usual theoreticaltreatments for the photon statistics of suchdevicesrely
Hong Tran, Nhung; Huy Le, Binh; Fan, Shizhao; Zhao, Songrui; Mi, Zetian; Schmidt, Benjamin A.; Savard, Michel; Gervais, Guillaume; Butcher, Kenneth Scott A.
2013-12-23
We report on a detailed study of the structural and optical properties of nonstoichiometric nitrogen-rich InN grown on sapphire substrates, by migration enhanced afterglow deposition. The samples were polycrystalline, with the presence of InN dots. Unusually strong photoluminescence emission was measured at cryogenic temperatures, with the peak energy at ?0.68?eV. Detailed analysis further shows that the sample has very low residual electron density in the range of ?10{sup 16}?cm{sup ?3} at temperatures below 20?K.
Columbia University
availability increases the metabolic cost of a single action potential and disrupts K+ /Na+ homeo- stasis. These include the maintenance of the resting potential, transport of metabolites along axonal or dendritic-consuming processes in neurons. Ion pumps are distributed over the entire cell membrane but are particularly clustered
D. Karakhanyan; Sh. Khachatryan
2009-08-27
The degeneracy of the lowest weight representations of the quantum superalgebra $osp_q(1|2)$ and their tensor products at exceptional values of %when deformation parameter $q$ takes exceptional values is studied. The main features of the structures of the finite dimensional lowest weight representations and their fusion rules are illustrated using realization of group generators as finite-difference operators acting in the space of the polynomials. The complete fusion rules for the decompositions of the tensor products at roots of unity are presented. The appearance of indecomposable representations in the fusions is described using Clebsh-Gordan coefficients derived for general values of $q$ and at roots of unity.
Establishing a rodent (Fischer 344 rat) model of mild cognitive impairment in aging
LaSarge, Candi Lynn
2009-05-15
Mild Cognitive Impairment is characterized by age-related decline in a variety of cognitive domains, including reference and working memory and olfactory function. Importantly, declining age-related mnemonic abilities is not inevitable; learning...
Doll, Tom; Duncan, Nikki
2013-03-13
The majority of previous research into the relationship between emotion recognition and healthy adult aging finds an age-related decline in facial emotion recognition accuracy in individuals over 60. However, this apparent age-related decline...
MICCAI Workshop on: Biophotonics Imaging
, DTU, Denmark #12;51 A bidimensional signal processing approach to vesicle trafficking analysis in 3D, INRA Jouy-en-Josas, France 61 Characterization of pre- and postoperative macular holes from retinal OCT
Wolfe, Patrick J.
to instability (single / double degenerate) · Thermonuclear Explosion: Deflagration/Detonation · Nickel to Cobalt
Matous Mroveca,b , Thorsten Ochsb
Vitek, Vaclav
" are energe- tically almost degenerate in the two transition metals stu- died and thus comparison
Taylor, Frank E.
A search is presented for direct chargino production based on a disappearing-track signature using 20.3??fb[superscript ?1] of proton-proton collisions at s? = 8??TeV collected with the ATLAS experiment at the LHC. In ...
MATHEMATICAL AND NUMERICAL ANALYSIS OF A TRANSIENT EDDY CURRENT PROBLEM ARISING FROM
RodrÃguez, Rodolfo
MATHEMATICAL AND NUMERICAL ANALYSIS OF A TRANSIENT EDDY CURRENT PROBLEM ARISING FROM transient axisymmetric eddy current problem governing such phenomenon. The resulting problem is degenerate. Electromagnetic forming, finite elements, eddy current, transient electromagnetics, degenerate parabolic problems
8.06 Quantum Physics III, Spring 2003
Rajagopal, Krishna, 1965-
Continuation of 8.05. Units: natural units, scales of microscopic phenomena, applications. Time-independent approximation methods: degenerate and non-degenerate perturbation theory, variational method, Born-Oppenheimer ...
Stevens, Anna L. (Anna Lea)
2006-01-01
Osteoarthritis is characterized by synovial joint degeneration, and its cardinal pathological feature is degeneration and loss of the articular cartilage joint surface. While the aetiology of osteoarthritis is unknown, ...
Isolation and characterization of resistance gene analogs (RGAs) in sorghum
Cho, Jae-Min
2005-08-29
to isolate resistance gene analogs (RGAs) by PCR with degenerate primers and homology searches from public databases. Multiple combinations of degenerate primers were designed from three conserved motifs (one motif was used for a subgroup-specific primer...
2015-01-01
converting psychosocial stress into mononuclear cellG.E. , 2007. Psychological stress and disease. JAMA 298,Glaser, R. , 2003. Chronic stress and age-related increases
Elucidation of Initiation and Maintenance Mechanisms of X Chromosome Inactivation
Minkovsky, Alissa
2013-01-01
A.L. , et al. (2012). Resveratrol ameliorates aging-relatedHIV-1 activity of resveratrol derivatives and synergistic1 by the combination of resveratrol and decitabine. Bioorg.
TGF- Sma/Mab Signaling Mutations Uncouple Reproductive Aging from Somatic Aging
Murphy, Coleen
mutations and treatments that extend C. elegans' reproductive period also regulate longevity, suggesting, with infertility and maternal age-related birth defects arising during the fourth decade of life [1]. While reproductive aging may allow us to address the problems of maternal age-related infertility and birth defects
Palanker, Daniel
system. Index Terms--Biomedical image processing, macular degenera- tion, retinal prosthesis, retinitisIEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, VOL. 54, NO. 6, JUNE 2007 993 Image Processing for a High-Resolution Optoelectronic Retinal Prosthesis Alon Asher*, William A. Segal, Stephen A. Baccus
This information is for the personal use of attendees of the University of Florida Industrial
Van Stryland, Eric
excision and processing. Optical Biopsy #12;6 OCT Subject Categories Source: Courtesy of Wolfgang Drexler of OCT in Ophthalmology OCT1 (1996) Carl Zeiss Meditec OCT2 (2000) Stratus OCT3 (2002) #12;9 OCT Retinal to optic disc Retinal Pathology 250µm 500 µm Full thickness macular hole Partial thickness or lamellar hole
Ha, Cuong Huy
2015-04-29
in the connective tissue region, liquefactive degeneration of the basal cell layer of the epithelium, and overlying hyperkeratinization in the reticular, papular or plaque-like forms.14 Degenerating basal keratinocytes form colloid bodies called Civatte... liquefactive degeneration of the basal cell layer and a dense, band-like inflammatory infiltrate consisting of lymphocytes. Supportive findings include: saw-tooth rete ridges, Civatte bodies, and hyperkeratosis.15 Exclusionary histological criteria include...
Wavelength-doubling optical parametric oscillator
Armstrong, Darrell J. (Albuquerque, NM); Smith, Arlee V. (Albuquerque, NM)
2007-07-24
A wavelength-doubling optical parametric oscillator (OPO) comprising a type II nonlinear optical medium for generating a pair of degenerate waves at twice a pump wavelength and a plurality of mirrors for rotating the polarization of one wave by 90 degrees to produce a wavelength-doubled beam with an increased output energy by coupling both of the degenerate waves out of the OPO cavity through the same output coupler following polarization rotation of one of the degenerate waves.
Decentralizing urbanization : harnessing the potential of small cities in India
Suri, Sagarika
2011-01-01
Perceived as symbols of national development or degeneration, megacities continue to dominate discourse and action related to urbanization, particularly in developing countries like India. Simultaneously, a large portion ...
Publications. 1. A compact embedding theorem for a class of degenerate Sobolev spaces. Rendiconti Sem. Mat. Univ. Polit. Torino, 49(3); 399-420, 1991. 2.
A deformation of quantum affine algebra in squashedWess-Zumino...
Office of Scientific and Technical Information (OSTI)
by computing the rs-matrices that satisfy the extended classical Yang-Baxter equation. Finally, two degenerate limits are discussed. Authors: Kawaguchi, Io ; Yoshida,...
The Impact of Biomechanics in Tissue Engineering and Regenerative Medicine
Butler, David L.
Biomechanical factors profoundly influence the processes of tissue growth, development, maintenance, degeneration, and repair. Regenerative strategies to restore damaged or diseased tissues in vivo and create living tissue ...
Moreau, Kate L. (Kate Lauren)
2011-01-01
Cataract, the leading cause of blindness worldwide, is the opacification of the eye lens. In.age-related cataract, as well as roughly one half of congenital cataract cases, aggregation or precipitation of crystallin proteins ...
Modulating Peripersonal and Extrapersonal Reach Space: A Developmental Perspective
Cacola, Priscila Martins
2012-10-19
The primary intent of this study was to gain insight into the developmental nature of spatial perception and representation. More specifically, the work presented here examined 1) the age-related ability to modulate peri- and extrapersonal space via...
Fagan, Stephanie
2009-07-03
Dual process theories account for age-related changes in memory by proposing that old age is associated with deficits in recollection together with invariance in familiarity (DPHMA). The authors evaluated the DPHMA by ...
"The Biology and Pathology of the Visual System" Graduate Course, BIO5501
Kornfeld, S. Kerry
and corneal renewal Andrew Huang Thu Sept 12th Structure of vitreous body-age related cataracts David Beebe 17th Photoreceptors and signal transduction Vladimir Kefalov Tue Oct 22nd Visual adaptation
Behavioral impulsivity and hallucinations : insights from Parkinson's disease
Ashourian, Paymon
2011-01-01
Parkinson's disease (PD) is an age-related degenerative disease of the brain, characterized by motor, cognitive, and psychiatric symptoms. Neurologists and neuroscientists now understand that several symptoms of the disease, ...
Speed of processing versus dual-tasking in ageing using a motor-free paradigm.
Oliphant, Kirsty
2012-06-27
Age effects on dual-task costs and speed of processing were investigated on young, middle and old participants. Dual-tasking literature debates the presence of an age-related dual task decline in older adults and we hope ...
Executive functions and dual-task ability in healthy ageing and in Parkinson's disease
Sanderson, Rebecca
2011-06-29
Abstract Objectives: First, to assess memory and executive ability in healthy older adults, relative to young controls, in order to determine the pattern of normal age-related decline. Second, to compare this healthy ...
Evidence for a Common Mechanism of SIRT1 Regulation by Allosteric Activators
Hubbard, B. P.
A molecule that treats multiple age-related diseases would have a major impact on global health and economics. The SIRT1 deacetylase has drawn attention in this regard as a target for drug design. Yet controversy exists ...
Research Report Age differences of multivariate network expressions during task-switching
Columbia University, Taub Institute, 630 West 168th Street, P & S Box 16, New York, NY 10032, United States as well as corrective interventions for age-related decline (Lustig, Shah, Seidler, & Reuter-Lorenz, 2009
Selection requirements during verb generation: differential recruitment in older and younger adults
Jonides, John
. Reuter-Lorenz* Department of Psychology, University of Michigan, Ann Arbor, MI 48109-1109, USA Received that dysfunction of frontal systems may underlie age-related cognitive decline (Raz et al., 1997; West, 1996). Here
Jung, Sung Hoon
2009-06-02
Asphalt oxidation causes major changes to binder properties and is hypothesized to be a major contributor to age-related pavement failure such as fatigue cracking. Extensive laboratory aging research has been done to assess ...
Tsenkina, Yanina
2013-07-06
Recent clinical studies suggest that white matter pathology rather than grey matter abnormality is the major neurobiological substrate of age- related cognitive decline during “healthy” aging. According to this hypothesis, ...
Ghazali, Zayba
2011-06-29
OBJECTIVES: This study aimed to explore age-related differences in dual-tasking. Previous studies report no age-effects in dual-tasking among healthy individuals in comparison to severe dual-tasking impairment in Alzheimer’s ...
Identification and Rescue of -Synuclein Toxicity in Parkinson Patient-Derived Neurons
Chung, Chee Yeun
The induced pluripotent stem (iPS) cell field holds promise for in vitro disease modeling. However, identifying innate cellular pathologies, particularly for age-related neurodegenerative diseases, has been challenging. ...
Li, Lian
pathological feature common to many age- related neurodegenerative diseases, including Parkinson's disease-related neurodegenerative diseases, including Parkinson's disease (PD), Alzheimer's disease (AD), Huntington's disease (HD Publishers Ltd. Aggresome Formation and Neurodegenerative Diseases: Therapeutic Implications J.A. Olzmann1
Chalkiadaki, Angeliki
SIRT1 is a metabolic sensor and regulator in various mammalian tissues and functions to counteract metabolic and age-related diseases. Here we generated and analyzed mice that express SIRT1 at high levels specifically in ...
Fracture, aging and disease in bone
Ager, J.W.; Balooch, G.; Ritchie, R.O.
2006-01-01
and R. O. Ritchie: Effect of aging on the toughness of humanof microstructure in the aging-related deterioration of thestudy of the effect of aging on human cortical bone J.
Aging in Place: Smith, Media Texts and the Invisible Gendered Caregiver
Storelli, Elizangela
2010-01-01
Timonen. 2007. Home Care for Aging Populations. Northampton,and John A Krout. 2004. ?Aging in Place in Different HousingFederal Interagency Forum on Aging-Related Statistics. 2008.
Kozlowska, Maria Teresa
2010-06-30
Older adults demonstrate poor performance on standard executive tests. However, age-related deficits have been found only on a number of more realistic executive tests. The present study investigated age effects in multitasking, requiring a range...
SirT1 regulates bone mass in vivo through regulation of osteoblast and osteoclast differentiation
Zainabadi, Kayvan
2009-01-01
As mammals age, osteoblast numbers decrease while osteoclast numbers increase, resulting in age-related or post-menopausal osteoporosis. SirT1, the mammalian orthologue of yeast Sir2, has been shown to be a negative regulator ...
Evolving Metallurgical Behaviors in Plutonium from Self-Irradiation
Chung, B W; Lema, K E; Hiromoto, D S
2009-05-05
The plutonium alpha-decay leads to the age-related changes in physical properties. We review our experimental approaches including analytical techniques to assess the effects of extended aging on plutonium alloys, together with our recent results on age-related changes in physical and static mechanical properties. The ultimate goal of this work is to develop capabilities to predict metallurgical evolution driven by aging effects.
Boyer, Edmond
Accepted Manuscript Comment on "Ccl2, Cx3cr1 and Ccl2/Cx3cr1 chemokine deficiencies on "Ccl2, Cx3cr1 and Ccl2/Cx3cr1 chemokine deficiencies are not sufficient to cause age- related retinal on "Ccl2, Cx3cr1 and Ccl2/Cx3cr1 chemokine deficiencies are not sufficient to cause age- related retinal
Identifying Dark Matter Burners in the Galactic center Igor V. Moskalenko*1
Moskalenko, Igor V.
Identifying Dark Matter Burners in the Galactic center Igor V. Moskalenko*1 and Lawrence L. Wai, i.e. "WIMP burners", in the vicinity of an adiabatically grown SMBH. We find that the most efficient WIMP burners are stars with degenerate electron cores, e.g. white dwarfs (WD) or degenerate cores
White dwarf mergers,White dwarf mergers, thermonuclear supernovae,thermonuclear supernovae,
Hinton, Jim
White dwarf mergers,White dwarf mergers, thermonuclear supernovae,thermonuclear supernovae fusion is ignited. Degenerate, hence runaway. #12;CO white dwarf accretes, either from companion, or from disk after merger. As it approaches maximum mass, C fusion is ignited. Degenerate, hence runaway. SN Ia
Wan, Lu, Ph. D. Massachusetts Institute of Technology
2008-01-01
Osteoarthritis is affecting over 20 million people in the United States, the etiology of which is still unclear. As abnormal stress is believed to be one of the factors causing the degeneration of cartilage, the combined ...
SU(3) and SU(4) Singlet Quantum Hall States at v = 2/3
Wu, Fengcheng
We report on an exact diagonalization study of fractional quantum Hall states at a filling factor of ? = 2/3 in a system with a fourfold degenerate n = 0 Landau level and SU(4) symmetric Coulomb interactions. Our investigation ...
A CHARACTERISTIC GALERKIN METHOD WITH ADAPTIVE ERROR CONTROL FOR THE CONTINUOUS CASTING PROBLEM
A CHARACTERISTIC GALERKIN METHOD WITH ADAPTIVE ERROR CONTROL FOR THE CONTINUOUS CASTING PROBLEM. Engrg. (to appear) Abstract. the continuous casting problem is a convectiondominated nonlinearly, continuous casting, method of characteristics, convec tion dominated diffusion, degenerate parabolic
A CHARACTERISTIC GALERKIN METHOD WITH ADAPTIVE ERROR CONTROL FOR THE CONTINUOUS CASTING PROBLEM
Nochetto, Ricardo H.
A CHARACTERISTIC GALERKIN METHOD WITH ADAPTIVE ERROR CONTROL FOR THE CONTINUOUS CASTING PROBLEM casting problem is a convectiondominated nonlinearly degenerate diffusion problem. It is discretized adaptive method. Keywords. a posteriori error estimates, continuous casting, method of characteristics
Introduction Constrained distribution
Nuel, Gregory
Introduction Constrained distribution Observed pattern distribution Counting patterns-9 September 2009 G. Nuel Counting patterns in degenerated sequences #12;Introduction Constrained distribution Observed pattern distribution Outline 1 Introduction Special letters in biological sequences Counting
Bajpayee, Ambika Goel
2015-01-01
Traumatic joint injuries significantly increase synovial fluid levels of pro-inflammatory cytokines that can initiate cartilage degeneration leading to osteoarthritis (OA). Articular cartilage is a highly negatively charged, ...
Zand, Robert
Mechanisms of bioprosthetic heart valve failure: Fatigue causes collagen denaturation heart valve (BPHV) degeneration, characterized by extracellular matrix deterioration, remod- eling) with glutaraldehyde fixed porcine aortic valve bioprostheses, that the mechanical function of cardiac valve cusps
Enhancing synaptogenesis in diseases characterized by deficiencies in brain synapses
Wurtman, Richard Jay
The loss of hippocampal and cortical synapses, resulting from impaired synaptogenesis, accelerated synaptic degeneration, or both, is one of the earliest neuropathologic findings in Alzheimer’s Disease and is the finding ...
A TRANSIENT EDDY CURRENT PROBLEM ON A MOVING DOMAIN. MATHEMATICAL ANALYSIS
RodrÃguez, Rodolfo
A TRANSIENT EDDY CURRENT PROBLEM ON A MOVING DOMAIN. MATHEMATICAL ANALYSIS ALFREDO BERM is to introduce and analyze a weak formulation of the transient eddy current problem governing electromagnetic. Electromagnetic forming, transient eddy current problem, axisymmetric problem, degenerate parabolic problem
Experiments with interacting Bose and Fermi gases
Stan, Claudiu Andrei
2005-01-01
In the past few years, the study of trapped fermionic atoms evolved from the first cooling experiments which produced quantum degenerate samples to becoming one of the most exciting branches of current atomic physics ...
Computational regulatory genomics : motifs, networks, and dynamics
Kheradpour, Pouya
2012-01-01
Gene regulation, the process responsible for taking a static genome and producing the diversity and complexity of life, is largely mediated through the sequence specific binding of regulators. The short, degenerate nature ...
Mechanisms of neurodegeneration and neuronal cell loss in the hippocampus in murine scrapie
Brown, Deborah A.
2010-01-01
Transmissible spongiform encephalopathies (TSEs) or prion diseases are defined by infectivity and by the pathological damage they produce in the central nervous system (CNS), typically involving spongiform degeneration or ...
A collagen based scaffold for the repair of annulus fibrosus defects
Saad, Leonide C. (Leonide Camile), 1977-
2007-01-01
The intervertebral disc (IVD) is the natural cartilaginous cushion found between the osseous vertebrae of the spinal column. It is an essential element for the flexibility of the spine but undergoes major degeneration with ...
A collagen-GAG matrix for the growth of intervertebral disc tissue
Hastreiter, Dawn (Dawn Marie), 1973-
2002-01-01
Intervertebral disc (IVD) degeneration and herniation is a significant problem, more so in the aviation field. The IVD also changes during spaceflight. Current treatments for IVD problems can have unfavorable long-term ...
Investigation into the pathogenesis of Spinocerebellar Ataxia Type 5
Clarkson, Yvonne Louise
Mutations in SPTBN2, the gene encoding b-III spectrin, give rise to spinocerebellar ataxia type 5 (SCA5), an autosomal dominant neurodegenerative disease characterized by motor incoordination and cerebellar degeneration. ...
On the damping of right hand circularly polarized waves in spin quantum plasmas
Iqbal, Z.; Hussain, A.; Murtaza, G.; Ali, M.
2014-12-15
General dispersion relation for the right hand circularly polarized waves has been derived using non-relativistic spin quantum kinetic theory. Employing the derived dispersion relation, temporal and spatial damping of the right hand circularly polarized waves are studied for both the degenerate and non-degenerate plasma regimes for two different frequency domains: (i) k{sub ?}v?(?+?{sub ce}),(?+?{sub cg}) and (ii) k{sub ?}v?(?+?{sub ce}),(?+?{sub cg}). Comparison of the cold and hot plasma regimes shows that the right hand circularly polarized wave with spin-effects exists for larger k-values as compared to the spinless case, before it damps completely. It is also found that the spin-effects can significantly influence the phase and group velocities of the whistler waves in both the degenerate and non-degenerate regimes. The results obtained are also analyzed graphically for some laboratory parameters to demonstrate the physical significance of the present work.
Genetic factors influencing the peripheral nervous system in health and disease
Comley, Laura Helen
2011-11-25
Lower motor neurons of the peripheral nervous system are responsible for innervating skeletal muscle and controlling all voluntary movements of the body. Degeneration of motor neurons underlies conditions such as ...
Morphological, cellular and proteomic features of canine myxomatous mitral valve disease
Han, Richard I-Ming
2009-01-01
Myxomatous mitral valve degeneration (MMVD) is the single most common cardiac disease of the dog, and is analogous to Mitral Valve Prolapse in humans. Very little is known about the aetiopathogenesis of this disease or ...
RAPID COMMUNICATIONS PHYSICAL REVIEW A 82, 030501(R) (2010)
Blinov, Boris
2010-01-01
attributable to their long trapping times which allow rapid accumulation of statistics, and since inhomogeneous of the cooling beam to prevent optical pumping into degenerate dark states and to separate Zeeman levels
Sphericity determination using resonant ultrasound spectroscopy
Dixon, R.D.; Migliori, A.; Visscher, W.M.
1994-10-18
A method is provided for grading production quantities of spherical objects, such as roller balls for bearings. A resonant ultrasound spectrum (RUS) is generated for each spherical object and a set of degenerate sphere-resonance frequencies is identified. From the degenerate sphere-resonance frequencies and known relationships between degenerate sphere-resonance frequencies and Poisson's ratio, a Poisson's ratio can be determined, along with a 'best' spherical diameter, to form spherical parameters for the sphere. From the RUS, fine-structure resonant frequency spectra are identified for each degenerate sphere-resonance frequency previously selected. From each fine-structure spectrum and associated sphere parameter values an asphericity value is determined. The asphericity value can then be compared with predetermined values to provide a measure for accepting or rejecting the sphere. 14 figs.
Mohiuddin, T. M. G.
We uncover the constitutive relation of graphene and probe the physics of its optical phonons by studying its Raman spectrum as a function of uniaxial strain. We find that the doubly degenerate E[subscript 2g] optical mode ...
THE INSTITUTES AT NORTHWESTERN MEDICINE FOR TRANSLATIONAL
Chisholm, Rex L.
neurodegenerative diseases, what are their genetic implications, and how can they be treated? · What degeneration (CBD), Parkinson's disease (PD), Lewy body dementia (LBD), motor neuron disease (MND MEDICINE COGNITIVE NEUROLOGY AND ALZHEIMER'S DISEASE CENTER #12;THE INSTITUTES AT NORTHWESTERN MEDICINE
Koyuturk, Mehmet
, Inc., Cleveland OH. * Corresponding author Abstract Alzheimer's and Parkinson's diseases (AD and PD Alzheimer's disease (AD) and Parkinson's disease (PD) are caused by progressive degeneration and/or deathIntegrative Analysis of Common Neurodegenerative Diseases Using Gene Association, Interaction
ANRV314-NE30-09 ARI 27 February 2007 19:7 Peripheral Regeneration
: extracellular matrix B ¨unger bands: tubular cellular aggregates formed by proliferating Schwann cells after undergoes Wallerian degeneration. This process leads to the removal and recycling of axonal- and myelin
Rocky Planets Around Cool Stars A Marie Curie Initial Training Network
Pinfield, David J.
Rocky Planets Around Cool Stars A Marie Curie Initial Training Network Degenerate companions and extra-solar planets RoPACS May 2010 Munich Joana Gomes #12;RoPACS Degenarate companion and extrasolar planets L/ T dwarfs White
CLIFFORD ALGEBRAS AND THEIR APPLICATIONS
Ablamowicz, Rafal
sproessig@math.tu-freiberg.de Oc2000 Birkh"auser Boston Library of Congress Cataloging-in-Publication"obius Transformation, Green Function and the Degenerate Elliptic Equation Xinhua Ji and Monogenic Functions .......................................................237 The Schwarzian and M
FINDING SIMPLICITY IN THE COMPLEX SYSTEMIC ARTERIAL SYSTEM: BASIS OF INCREASED PULSE PRESSURE
Mohiuddin, Mohammad W.
2010-01-16
to characterize the interaction among heart, arterial system and axial-flow left ventricular assist device analytically. The fact that arterial systems degenerate into Windkessels explains why it becomes much easier to estimate total arterial compliance...
Improved bilinears in unquenched lattice QCD
Tanmoy Bhattacharya; Rajan Gupta; Weonjong Lee; Stephen R. Sharpe; Jackson M. S. Wu
2003-09-15
We summarize the extent to which one can use Ward identities to non-perturbatively improve flavor singlet and non-singlet bilinears with three flavors of non-degenerate dynamical Wilson-like fermions.
Two-dimensional ultrafast pulse shaping and its application to coherent control and spectroscopy
Vaughan, Joshua Charles
2005-01-01
This thesis develops powerful new methods for shaping femtosecond laser pulses in two dimensions and explores their application to coherent control of propagating lattice excitations and degenerate four-wave mixing ...
Jan de Boer; Kyriakos Papadodimas; Erik Verlinde
2009-07-23
We construct in the context of the AdS/CFT correspondence degenerate composite operators in the conformal field theory that are holographically dual to degenerate stars in anti de Sitter space. We calculate the effect of the gravitational back-reaction using the Tolman-Oppenheimer-Volkoff equations, and determine the "Chandrasekhar limit" beyond which the star undergoes gravitational collapse towards a black hole.
Diagrammatic Approach to Quantum Search
Thomas G. Wong
2015-02-09
We introduce a simple diagrammatic approach for estimating how a randomly walking quantum particle searches on a graph in continuous-time, which involves sketching small weighted graphs with self-loops and considering degenerate perturbation theory's effects on them. Using this method, we give the first example of degenerate perturbation theory solving search on a graph whose evolution occurs in a subspace whose dimension grows with $N$.
Proof of a Conjecture by Lewandowski and Thiemann
Christian Fleischhack
2003-04-01
It is proven that for compact, connected and semisimple structure groups every degenerate labelled web is strongly degenerate. This conjecture by Lewandowski and Thiemann implies that diffeomorphism invariant operators in the category of piecewise smooth immersive paths preserve the decomposition of the space of integrable functions w.r.t. the degeneracy and symmetry of the underlying labelled webs. This property is necessary for lifting these operators to well-defined operators on the space of diffeomorphism invariant states.
Nuclear Physics in a Susy Universe
L. Clavelli; I. Perevalova
2010-07-28
We refine a previous zeroth order analysis of the nuclear properties of a supersymmetric (susy) universe with standard model particle content plus degenerate susy partners. No assumptions are made concerning the Higgs structure except we assume that the degenerate fermion/sfermion masses are non-zero. This alternate universe has been dubbed Susyria and it has been proposed that such a world may exist with zero vacuum energy in the string landscape.
Makous, Walter
in CBA/CaJ and CBA C57BL F1-hybrid mice, which show no apparent change in sensory function at these ages-characterized age- related hearing loss, and two others, the CBA/CaJ and the F1 hybrid of a C57 and the CBA, because
O'Donnell, Sean
eusocial insect workers exhibit age-related division of labor. Adults begin working inside the nest, moving whether eusocial wasp workers (Polybia aequatorialis) exhibit similar changes in adult neuroanatomy. Wasps relative to the Kenyon cell body region, than do nurse bees. This difference is more strongly related
SPECIAL ISSUE REVIEWSA PEER REVIEWED FORUM C. elegans as a Model Organism to
Caldwell, Guy
-syn) as a genetic cause of familial Parkinson's disease (PD) in 1997 (Spillantini et al., 1997), human geneticists Molecular Pathways Involved with Parkinson's Disease Adam J. Harrington,1 Shusei Hamamichi,1 Guy A. Caldwell,1,2 and Kim A. Caldwell1,2 * Parkinson's disease (PD) is an age-related movement disorder resulting
Telomere length in circulating leukocytes is associated with lung function and
Nyholt, Dale R.
Telomere length in circulating leukocytes is associated with lung function and disease Eva Albrecht intrinsic age-related processes contribute to the interindividual variability of lung function. Our meta-analysis of 14 studies included 934 COPD cases with 15846 controls defined according to the Global Lungs
An Investigation of Episodic Memory for Item and Associative Information in Aging
Thiede, Emily
2013-07-02
This study aimed to explore to what extent the memory difficulties in older adults are a result of problems with memory control and the role played by associative memory in age-related changes. This project explored participants’ ability to encode...
Neurocognitive Aging and the Compensation Hypothesis
Neurocognitive Aging and the Compensation Hypothesis Patricia A. Reuter-Lorenz and Katherine A imaging studies of cognitive aging is evidence for age-related overactivation: greater acti- vation in older adults than in younger adults, even when performance is age-equivalent. Here we examine the hy
Effect of aging on the toughness of human cortical bone: evaluation by R-curves
Ritchie, Robert
Effect of aging on the toughness of human cortical bone: evaluation by R-curves R.K. Nallaa,b , J online 27 October 2004 Abstract Age-related deterioration of the fracture properties of bone, coupled, and hence, an understanding of how its fracture properties degrade with age is essential. The present study
Testing quantum-like models of judgment for question order effect
Thomas Boyer-Kassem; Sébastien Duchêne; Éric Guerci
2015-08-25
Lately, so-called "quantum" models, based on parts of the mathematics of quantum mechanics, have been developed in decision theory and cognitive sciences to account for seemingly irrational or paradoxical human judgments. We consider here some such quantum-like models that address question order effects, i.e. cases in which given answers depend on the order of presentation of the questions. Models of various dimensionalities could be used, can the simplest ones be empirically adequate? From the quantum law of reciprocity, we derive new empirical predictions that we call the Grand Reciprocity equations, that must be satisfied by several existing quantum-like models, in their non-degenerate versions. Using substantial existing data sets, we show that these non-degenerate versions fail the GR test in most cases, which means that, if quantum-like models of the kind considered here are to work, it can only be in their degenerate versions. However, we suggest that the route of degenerate models is not necessarily an easy one, and we argue for more research on the empirical adequacy of degenerate quantum-like models in general.
Relativistic harmonic oscillator model for quark stars
Vishnu M. Bannur
2008-10-06
The relativistic harmonic oscillator (RHO) model of hadrons is used to study quark stars. The mass-radius relationship is obtained and compared with bag model of quark star, using Tolman-Oppenheimer-Volkoff equation. In this model, the outward degenerate pressure due to discrete Landau levels and Landau degeneracy balances the inward gravitational pressure. Where as in bag model the degenerate pressure is due to the standard continuum levels which balances the combined inward pressure due to gravitation and bag pressure. So in RHO model, the confinement effect is included in the degenerate pressure. We found a qualitative similarity, but quantitative differences in mass-radius relationship of quark stars in these two models. Masses and radii are relatively larger and the central energy densities, required for stable quark stars, are lower in RHO model than that of bag model.
Modulation of drift-wave envelopes in a nonuniform quantum magnetoplasma
Misra, A. P. E-mail: apmisra@gmail.com
2014-04-15
We study the amplitude modulation of low-frequency, long-wavelength electrostatic drift-wave envelopes in a nonuniform quantum magnetoplasma consisting of cold ions and degenerate electrons. The effects of tunneling associated with the quantum Bohm potential and the Fermi pressure for nonrelativistic degenerate electrons, as well as the equilibrium density and magnetic field inhomogeneities are taken into account. Starting from a set of quantum magnetohydrodynamic equations, we derive a nonlinear Schrödinger equation (NLSE) that governs the dynamics of the modulated quantum drift-wave packets. The NLSE is used to study the modulational instability (MI) of a Stoke's wave train to a small plane wave perturbation. It is shown that the quantum tunneling effect as well as the scale length of inhomogeneity plays crucial roles for the MI of the drift-wave packets. Thus, the latter can propagate in the form of bright and dark envelope solitons or as drift-wave rogons in degenerate dense magnetoplasmas.
High-resolution inverse Raman and resonant-wave-mixing spectroscopy
Rahn, L.A. [Sandia National Laboratories, Livermore, CA (United States)
1993-12-01
These research activities consist of high-resolution inverse Raman spectroscopy (IRS) and resonant wave-mixing spectroscopy to support the development of nonlinear-optical techniques for temperature and concentration measurements in combustion research. Objectives of this work include development of spectral models of important molecular species needed to perform coherent anti-Stokes Raman spectroscopy (CARS) measurements and the investigation of new nonlinear-optical processes as potential diagnostic techniques. Some of the techniques being investigated include frequency-degenerate and nearly frequency-degenerate resonant four-wave-mixing (DFWM and NDFWM), and resonant multi-wave mixing (RMWM).
What role does the third law of thermodynamics play in Szilard engines?
Kang-Hwan Kim; Sang Wook Kim
2011-12-14
The role of the third law of thermodynamics in the Szilard engine has been addressed. If the ground state is non-degenerate, the entropy production defined as the work extractable from the engine divided by temperature vanishes as temperature approaches zero due to the third law. The degenerate ground state induced by the symmetry or by accidence gives rise to non-zero entropy production at zero temperature associated with the residual entropy. Various physical situations such as the SZE consisting of bosons or fermions either with or without interaction have been investigated.
Charged Vacuum Bubble Stability
J. R. Morris
1998-10-20
A type of scenario is considered where electrically charged vacuum bubbles, formed from degenerate or nearly degenerate vacuua separated by a thin domain wall, are cosmologically produced due to the breaking of a discrete symmetry, with the bubble charge arising from fermions residing within the domain wall. Stability issues associated with wall tension, fermion gas, and Coulombic effects for such configurations are examined. The stability of a bubble depends upon parameters such as the symmetry breaking scale and the fermion coupling. A dominance of either the Fermi gas or the Coulomb contribution may be realized under certain conditions, depending upon parameter values.
Level Structure of 103Ag at high spins
Ray, S; Krishichayan,; Chakraborty, A; Mukhopadhyay, S; Ghugre, S S; Chintalapudi, S N; Sinha, A K; Garg, U; Zhu, S; Kharraja, B; Almehed, D
2007-01-01
High spin states in $^{103}$Ag were investigated with the Gammasphere array, using the $^{72}$Ge($^{35}$Cl,$2p2n$)$^{103}$Ag reaction at an incident beam energy of 135 MeV. A $\\Delta J$=1 sequence with predominantly magnetic transitions and two nearly-degenerate $\\Delta J=1$ doublet bands have been observed. The dipole band shows a decreasing trend in the $B(M1)$ strength as function of spin, a well established feature of magnetic bands. The nearly-degenerate band structures satisfy the three experimental signatures of chirality in the nuclei; however microscopic calculations are indicative of a magnetic phenomenon
Level Structure of 103Ag at high spins
S. Ray; N. S. Pattabiraman; Krishichayan; A. Chakraborty; S. Mukhopadhyay; S. S. Ghugre; S. N. Chintalapudi; A. K. Sinha; U. Garg; S. Zhu; B. Kharraja; D. Almehed
2007-12-07
High spin states in $^{103}$Ag were investigated with the Gammasphere array, using the $^{72}$Ge($^{35}$Cl,$2p2n$)$^{103}$Ag reaction at an incident beam energy of 135 MeV. A $\\Delta J$=1 sequence with predominantly magnetic transitions and two nearly-degenerate $\\Delta J=1$ doublet bands have been observed. The dipole band shows a decreasing trend in the $B(M1)$ strength as function of spin, a well established feature of magnetic bands. The nearly-degenerate band structures satisfy the three experimental signatures of chirality in the nuclei; however microscopic calculations are indicative of a magnetic phenomenon
A (P)HMC algorithm for N_f = 2 + 1 + 1 flavours of twisted mass fermions
T. Chiarappa; R. Frezzotti; C. Urbach
2005-09-27
We present a detailed design of a (P)HMC simulation algorithm for N_f = 2 + 1 + 1 maximally twisted Wilson quark flavours. The algorithm retains even/odd and mass-shift preconditionings combined with multiple Molecular Dynamics time scales for both the light mass degenerate, u and d, quarks and the heavy mass non-degenerate, s and c, quarks. Various non-standard aspects of the algorithm are discussed, among which those connected to the use of a polynomial approximation for the inverse (square root of the squared) Dirac matrix in the s and c quark sector.
Method for resonant measurement
Rhodes, G.W.; Migliori, A.; Dixon, R.D.
1996-03-05
A method of measurement of objects to determine object flaws, Poisson`s ratio ({sigma}) and shear modulus ({mu}) is shown and described. First, the frequency for expected degenerate responses is determined for one or more input frequencies and then splitting of degenerate resonant modes are observed to identify the presence of flaws in the object. Poisson`s ratio and the shear modulus can be determined by identification of resonances dependent only on the shear modulus, and then using that shear modulus to find Poisson`s ratio using other modes dependent on both the shear modulus and Poisson`s ratio. 1 fig.
Study of stopping power for a proton moving in a plasma with arbitrary degeneracy
Zhang, Ya; Song, Yuan-Hong; Wang, You-Nian [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)] [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)
2013-10-15
Excitation of bulk solid electrons with arbitrary degeneracy, by external charged particles, is investigated by a two-dimensional nonlinear quantum hydrodynamic (QHD) model. The nonlinear stopping power and wake potential are calculated by solving the nonlinear QHD equations with the flux corrected transport numerical method. Two cases of fully degenerated and partially degenerated electrons are compared and discussed in the same self-consistent QHD model. Our results are consistent with the well known dielectric calculation of the stopping power at higher velocity, but include the nonlinear terms of the interactions and give larger stopping power at smaller velocity.
Producing and Detecting Correlated atoms
Christoph I. Westbrook; Martijn Schellekens; Aurélien Perrin; Valentina Krachmalnicoff; Jose Carlos Viana Gomes; Jean-Baptiste Trebbia; Jérôme Estève; Hong Chang; Isabelle Bouchoule; Denis Boiron; Alain Aspect; Tom Jeltes; John McNamara; Wim Hogervorst; Wim Vassen
2006-09-04
We discuss experiments to produce and detect atom correlations in a degenerate or nearly degenerate gas of neutral atoms. First we treat the atomic analog of the celebrated Hanbury Brown Twiss experiment, in which atom correlations result simply from interference effects without any atom interactions.We have performed this experiment for both bosons and fermions. Next we show how atom interactions produce correlated atoms using the atomic analog of spontaneous four-wavemixing. Finally, we briefly mention experiments on a one dimensional gas on an atom chip in which correlation effects due to both interference and interactions have been observed.
Reducing differential equations for multiloop master integrals
Roman N. Lee
2015-04-21
We present an algorithm of the reduction of the differential equations for master integrals the Fuchsian form with the right-hand side matrix linearly depending on dimensional regularization parameter $\\epsilon$. We consider linear transformations of the functions column which are rational in the variable and in $\\epsilon$. Apart from some degenerate cases described below, the algorithm allows one to obtain the required transformation or to ascertain irreducibility to the form required. Degenerate cases are quite anticipated and likely to correspond to irreducible systems.
Evolution of Static Physical Properties in Plutonium by Self-irradiation Damage
Chung, B W; Lema, K E; Hiromoto, D S
2010-04-13
The alpha-decay of plutonium leads to the age-related change in physical properties. This paper presents updated results of age-related effects on enriched and reference alloys measured from immersion density, dilatometry, and mechanical tests. After nearly 100 equivalent years of aging, both the immersion density and dilatometry show that the enriched alloys are decreasing in density by less than 0.02% per year and now exhibit a near linear density decrease, without void swelling. The tensile tests show that the aging process increases the strength of plutonium alloys, followed by possible saturation past 70 equivalent years of age. The ultimate goal of this work is to develop capabilities to predict physical properties changed by aging effects.
Some Considerations in Interviewing the Old, Old
Wingrove, C. Ray
1987-01-01
necessary in a given situation, nothing is lost and unsuspecting subjects need not know they transpired. Age related sensory changes may also necessitate sitting or standing closer to the older person than is normally comfortable for Americans. Interaction... with the old, old suffering from multiple sensory losses may require spatial communication usually reserved for intimacy. Delong (1970) has pointed out that the elderly often interpret normal social distance as cool and rejecting. Therefore, try to avoid...
Nondestructive ultrasonic testing of materials
Hildebrand, Bernard P. (Richland, WA)
1994-01-01
Reflection wave forms obtained from aged and unaged material samples can be compared in order to indicate trends toward age-related flaws. Statistical comparison of a large number of data points from such wave forms can indicate changes in the microstructure of the material due to aging. The process is useful for predicting when flaws may occur in structural elements of high risk structures such as nuclear power plants, airplanes, and bridges.
Nondestructive ultrasonic testing of materials
Hildebrand, B.P.
1994-08-02
Reflection wave forms obtained from aged and unaged material samples can be compared in order to indicate trends toward age-related flaws. Statistical comparison of a large number of data points from such wave forms can indicate changes in the microstructure of the material due to aging. The process is useful for predicting when flaws may occur in structural elements of high risk structures such as nuclear power plants, airplanes, and bridges. 4 figs.
LWR Sustainability: Assessment of Aging of Nuclear Power Plant Safety Related Concrete Strutures
Graves III, Herman; Naus, Dan J
2013-01-01
Current regulatory testing and inspection requirements are reviewed and a summary of degradation experience is presented. Techniques commonly used to inspect NPP concrete structures to assess and quantify age-related degradation are summarized. An approach for conduct of condition assessments of structures in NPPs is presented. Criteria, based primarily on visual indications, are provided for use in classification and assessment of concrete degradation. Materials and techniques for repair of degraded structures are generally discussed.
Role of high-order aberrations in senescent changes in spatial vision
Elliot, S; Choi, S S; Doble, N; Hardy, J L; Evans, J W; Werner, J S
2009-01-06
The contributions of optical and neural factors to age-related losses in spatial vision are not fully understood. We used closed-loop adaptive optics to test the visual benefit of correcting monochromatic high-order aberrations (HOAs) on spatial vision for observers ranging in age from 18-81 years. Contrast sensitivity was measured monocularly using a two-alternative forced choice (2AFC) procedure for sinusoidal gratings over 6 mm and 3 mm pupil diameters. Visual acuity was measured using a spatial 4AFC procedure. Over a 6 mm pupil, young observers showed a large benefit of AO at high spatial frequencies, whereas older observers exhibited the greatest benefit at middle spatial frequencies, plus a significantly larger increase in visual acuity. When age-related miosis is controlled, young and old observers exhibited a similar benefit of AO for spatial vision. An increase in HOAs cannot account for the complete senescent decline in spatial vision. These results may indicate a larger role of additional optical factors when the impact of HOAs is removed, but also lend support for the importance of neural factors in age-related changes in spatial vision.
Development of monolithic 3D ion traps microfabricated
Hensinger, Winfried
surface traps [1,2], 2) 3D Au coated alumina [3-5],3) 3D degenerate Silicon [6], 4) monolithic 3D Ga. 6) Electroplating to 5 µm thickness of Au. Concept Fabrication method Potential -25 V 25 V 0 V
Boyer, Edmond
ccsd-00000333(version2):29Apr2003 Schemes for loading a BoseEinstein condensate into a two results are presented. PACS numbers: 03.75.Fi, 05.30.Jp, 32.80.Pj I. INTRODUCTION BoseEinstein, California 90089-0484, USA We propose two loading mechanisms of a degenerate Bose gas into a surface trap
PUBLISHED ONLINE: 19 JUNE 2011 | DOI: 10.1038/NPHYS2012 Dynamical d-wave condensation of
Loss, Daniel
interacting particles. Prime examples are superfluidity in helium1 , atomic BoseEinstein condensation2 , s of excitonpolaritons are eight to nine orders of magnitude higher than those of atomic BoseEinstein in semiconductor quantum wells embedded in a planar microcavity structure. They behave as degenerate Bose gases
Weber, Rodney
Project #8: Zigang Ge and Robert Guldberg: Cartilage Regeneration with Functional Biomaterials from Georgia Institute of Technology and the GE lab from Peking University. The proposed collaboration the development of effective strategies for functional restoration of degenerated articular joints. Ge's lab
Pavliotis, Grigorios
Noise Induced State Transitions, Intermittency, and Universality in the Noisy Kuramoto the effect of pure additive noise on the long-time dynamics of the noisy Kuramoto- Sivashinsky (KS) equation close to the instability onset. When the noise acts only on the first stable mode (highly degenerate
Efficient method for controlling the spatial coherence of a laser
Cao, Hui
variation in the total output power is presented. It is based on varying the diameter of a spatial filter from 1 to 320,000, with less than a 50% change in the total output power. We show that a degenerate- hibiting very high spatial coherence and thermal sources or light emitting diodes (LEDs) having very low
Burchianti, A.
We use a gray molasses operating on the D[subscript 1] atomic transition to produce degenerate quantum gases of [superscript 6]Li with a large number of atoms. This sub-Doppler cooling phase allows us to lower the initial ...
Small entries of neutrino mass matrices
E. Kh. Akhmedov
1999-09-15
We consider phenomenologically allowed structures of the neutrino mass matrix in the case of three light neutrino species. Constraints from the solar, atmospheric and reactor neutrino experiments as well as those from the neutrinoless double beta decay are taken into account. Both hierarchical and quasi-degenerate neutrino mass cases are studied. Assuming maximal $\
The low-lying spectrum of N=1 supersymmetric Yang-Mills theory
Bergner, Georg; Montvay, Istvan; Muenster, Gernot; Piemonte, Stefano
2015-01-01
The spectrum of the lightest bound states in N=1 supersymmetric Yang-Mills theory with SU(2) gauge group, calculated on the lattice, is presented. The masses have first been extrapolated towards vanishing gluino mass and then to the continuum limit. The final picture is consistent with the formation of degenerate supermultiplets.
Concept : Cell Yield Glucose, mM
Málaga, Universidad de
on Limiting Substrate. Specific growth rate reaches a maximum value of 0.5 h-1. Value of KS here is 0.5 g L-1 body, degeneration) Limitation in the length of cDNA Lacks post-translational modification específico (Baculovirus) Cultivo fastidioso Tiempo de crecimiento my lento (tiempo de doblaje es 20h) #12
John Bulava; Philip Gerhold; Karl Jansen; Jim Kallarackal; Attila Nagy
2011-11-11
We study a chirally invariant Higgs-Yukawa model regulated on a space-time lattice. We calculate Higgs boson resonance parameters and mass bounds for various values of the mass of the degenerate fermion doublet. Also, first results on the phase transition temperature are presented. In general, this model may be relevant for BSM scenarios with a heavy fourth generation of quarks.
Moskalenko, Igor V.
. All rights reserved. Printed in U.S.A. DARK MATTER BURNERS Igor V. Moskalenko1 Hansen Experimental to thermonuclear burning. The model thus predicts the existence of unusual stars, essentially WIMP burners, in the vicinity of a SMBH. We find that the most efficient WIMP burners are stars with degenerate electron cores
Energy protection arguments fail in the interaction picture
Kenneth R. Brown
2007-07-27
Spin Hamiltonians with degenerate ground states are one potential system for the storage of quantum information at low temperatures. Trapped ions can be used to simulate the dynamics of these Hamiltonians, but the coherence-preserving properties will be lost. This illustrates that a quantum simulation performed in an interaction frame will not thermalize with its environment.
Chemical Physin 7 (1975) 62-72 8 North-Holland Publishing Company
1975-01-01
-INDUCED TRANSITIONS BETWEEN A-DOUBLETS IN `l-l MOLECULES: REDUCtlON TO A SINGLE SCAI-I-ERING POTENTIAL Sheldon GREEN are described by the rwo electronic potential energy surfaces which correlate with the elec tronictiy degenerate. Introduction When an atom collides with a molecule, transla- tional energy can be converted into internal
MIT Plasma Fusion Sciences Center IAP Seminar! Jan 10th, 2012!
MIT Plasma Fusion Sciences Center IAP Seminar! Jan 10th, 2012! ! ! ! ! ! Otto Landen! Associate-07NA27344 Inertial Confinement Fusion Physics and Challenges*! #12;The NIF ignition experiments-degenerate fuel Spherical collapse of the shell produces a central hot spot surrounded by cold, dense main fuel
Bachmann, Michael
Freezing and collapse of flexible polymers on regular lattices in three dimensions Thomas Vogel,1-degenerate energetic states is expected to happen: the freezing or crys- tallization of the polymer. Since interaction range, collapse and freezing transition can fall together in the thermodynamic limit 12
10.1101/gad.17311211Access the most recent version at doi: 2011 25: 1563-1567Genes Dev.
Valadkhan, Saba
of the spliceosomal cycle (Grainger and Beggs 2005). The mode of function of Prp8 is poorly understood, and it lacks a bromodomain (Grainger and Beggs 2005; Dlakic´ and Mushegian 2011). In addition, close to its C terminus it contains a degenerate MPN/Jab1 domain that is found in deubiquitinating enzymes (Grainger and Beggs 2005
A COLORED VERSION OF TVERBERG'S THEOREM I. BARANY AND D. G. LARMAN
Bárány, Imre
of 9>n then we say that {pv...,pd+1} and the simplex (possibly degenerate) conv(/7l5 ...,/?d+1) which. (ii) N(r,2) = 3r. We adopt the Tverberg approach of taking points P,P2,...,P3r and Q, P2,..., P3r
Abelian gauge, 65 Abelian monopole, 28
Binder, Bernd
degenerate Hamiltonian, 45 deviation, 17 dimensional shift, 107 dimensionality, 105 dimensionless, 149, 59, 70 human artificial, 144 hydrodynamics, 127 hyper-fine, 18 hypocycloidal, 26 impedance, 73, 90 confinement, 53 loop numbers, 28 Lord Rayleigh, 90 low temperature, 127 low-dimensional, 73 magnetic monopoles
Singlet Free Energies of a Static Quark-Antiquark Pair
Konstantin Petrov
2004-09-01
We study the singlet part of the free energy of a static quark anti-quark pair at finite temperature in three flavor QCD with degenerate quark masses using $N_{\\tau}=4$ and 6 lattices with Asqtad staggered fermion action. We look at thermodynamics of the system around phase transition and study its scaling with lattice spacing and quark masses.
Liu, Yijun
not degenerate for thin piezoelectric shells. The latter has signi®cant implications in applications of the piezo an important issue with the increasing applications of piezoelectric materials. In the realm of 3D analysisOn the conventional boundary integral equation formulation for piezoelectric solids with defects
Stellar Burning Falk Herwig, Alexander Heger, and Frank
Herwig, Falk
]. In these objects, a thermonuclear runaway of the helium shell on top of an electron-degenerate core (a young White implications for the production of neutron- rich elements. log Tlog Teffeff Figure 1-- A thermonuclear runaway stellar conditions. We will include a stellar equation of state as well as thermonuclear burning (TN burn
April 200224 ISSN:1369 7021 Elsevier Science Ltd 2002 Conventional superconductors
Davis, James C.
in the degenerate electron gas of a metal result in the formation of Cooper-pairs1. Each Cooper-pair can tunneling microscopy studies of the atomic-scale effects of individual Ni and Zn impurity atoms superconductivity in the cuprates. STM: constant-current imaging and tunneling spectroscopy We study the electronic
O'Leary, Michael
--1492 INTEGRABILITY AND BOUNDEDNESS OF LOCAL SOLUTIONS TO DOUBLY DEGENERATE QUASILINEAR PARABOLIC EQUATIONS Mike O'Leary. 1465 #12; 1466 mike o'leary H3) |a(x, t, u, v)| # C 1 {#(|u|)|v| p } 1- 1 p + C 4 |u| #(1- 1 p ) + # 1
Amand Faessler; G. L. Fogli; E. Lisi; V. Rodin; A. M. Rotunno; F. Simkovic
2009-03-06
The variances and covariances associated to the nuclear matrix elements (NME) of neutrinoless double beta decay are estimated within the quasiparticle random phase approximation (QRPA). It is shown that correlated NME uncertainties play an important role in the comparison of neutrinoless double beta decay rates for different nuclei, and that they are degenerate with the uncertainty in the reconstructed Majorana neutrino mass.
Neutrinoless double beta decay
Petr Vogel
2006-11-17
The status of the search for neutrinoless double beta decay is reviewed. The effort to reach the sensitivity needed to cover the effective Majorana neutrino mass corresponding to the degenerate and inverted mass hierarchy is described. Various issues concerning the theory (and phenomenology) of the relation between the $0\
Polarization Properties of the "Photon Pistol"
Reshetov, V A
2012-01-01
The deterministic single-photon emission by means of STIRAP through the atoms with degenerate levels is studied. The expression for the polarization matrix of the emitted photon is obtained and its dependence on the polarization of the driving laser field and on the initial atomic state is examined.
Polarization Properties of the "Photon Pistol"
V. A. Reshetov
2012-11-01
The deterministic single-photon emission by means of STIRAP through the atoms with degenerate levels is studied. The expression for the polarization matrix of the emitted photon is obtained and its dependence on the polarization of the driving laser field and on the initial atomic state is examined.
The FASEB Journal Review Biomechanics-driven chondrogenesis: from embryo
Athanasiou, Kyriacos
The FASEB Journal · Review Biomechanics-driven chondrogenesis: from embryo to adult Donald J, University of CaliforniaDavis, Davis, California, USA ABSTRACT Biomechanics plays a pivotal role in ar degeneration. Informed by the prominent role of biomechanics, mechanical stimuli have been har- nessed
Andrew J. Long; Cecilia Lunardini; Eray Sabancilar
2014-11-12
We study the physics potential of the detection of the Cosmic Neutrino Background via neutrino capture on tritium, taking the proposed PTOLEMY experiment as a case study. With the projected energy resolution of $\\Delta \\sim$ 0.15 eV, the experiment will be sensitive to neutrino masses with degenerate spectrum, $m_1 \\simeq m_2 \\simeq m_3 = m_\
Towards an improved test of Bose-Einstein statistics for photons
Pines, Alexander
Towards an improved test of Bose-Einstein statistics for photons Damon Brown , Dmitry Budker for photons obtained earlier (D. P. DeMille, D. Budker, N. Derr, and E. Deveney, Phys. Rev. Lett. 83(20), 1378 technique. We also discuss the ultimate limits that one can hope to obtain with this degenerate two-photon
Boyer, Edmond
Generation of polarization-entangled photons using type-II doubly periodically poled lithium the issue of the generation of non-degenerate cross-polarization-entangled photon pairs using type-conversion processes, namely ordinary pump photon down- conversion to either extraordinary signal and ordinary idler
Arnold, Jonathan
the problem of degenerating Greek facilities. The College of Agriculture and Environmental Sciences (CAES) has and development of the three major extension campuses. The CAES has developed a Facilities and Land Use Task Force related programs. This report is exemplary of what should be developed for the other CAES campuses
Coherent spinor dynamics in a spin-1 Bose condensate
Loss, Daniel
ARTICLES Coherent spinor dynamics in a spin-1 Bose condensate MING-SHIEN CHANG, QISHU QIN, WENXIAN, for example, a BoseEinstein condensate or a degenerate Fermi gas, the phase space accessible to low of coherent spin-changing collisions in a gas of spin-1 bosons. Starting with condensates occupying two spin
Author's personal copy Neuroscience Letters 541 (2013) 116119
Caldwell, Guy
2013-01-01
, exhibits neuroprotective activity in an animal model of Parkinson's disease. Valproic acid attenuates: Valproic acid Neurodegeneration Dopamine RNAi ERK-MAPK Caenorhabditis a b s t r a c t Parkinson's disease Ireland Ltd. All rights reserved. The degeneration of dopaminergic neurons in Parkinson's disease (PD
Neuroscience Letters 439 (2008) 129133 Contents lists available at ScienceDirect
Caldwell, Guy
2008-01-01
degeneration in animal models of Parkinson's disease Cody J. Locke, Stacey A. Fox, Guy A. Caldwell, Kim A 2008 Accepted 2 May 2008 Keywords: Neuroprotection 6-OHDA -Synuclein Parkinson's disease C. elegans a b s t r a c t Parkinson's disease (PD) is the second most common neurodegenerative disorder with 2
Neurobiology of Disease Loss-of-Function Analysis Suggests That Omi/HtrA2 Is Not
Guo, Ming
words: Parkinson's disease; mitochondrial protease; Omi/HtrA2; Pink1; genetic interactions; Drosophila in sporadic Parkinson's disease (PD) patients, leading tothedesignationofOmi/HtrA2asPDlocus13(PARK13).G399 Introduction Parkinson's disease (PD) is characterized by degeneration of ni- grostriatal dopaminergic neurons
Neurobiology of Disease Parkin Directly Modulates 26S Proteasome Activity
Lübbert, Hermann
. Introduction Parkinson's disease (PD) is a major neurodegenerative disease characterized by the degenerationNeurobiology of Disease Parkin Directly Modulates 26S Proteasome Activity Ji Won Um,1 Eunju Im,1-University Bochum, D-44780 Bochum, Germany, and 4Biofrontera Bioscience GmbH, D-51377 Leverkusen, Germany Parkinson
I M M U N O L O G Y Soft Landing
Royer, Dana
lymphocyte activity. Makrigiannakis et al. describe how corticotrophin-releasing hormone (CRH) produced in the vesicle sizes, possibly through fusion and fission mechanisms. -- MSL Langmuir, 10.1021/la0104370. P H YS tempera- tures that they form a quantum- degenerate gas, or Bose-Einstein condensate, promises to provide
The tip of the iceberg: RNA-binding proteins with prion-like domains in neurodegenerative disease
Shorter, James
) and a putative prion do- main. Indeed, of 210 human RRM-bearing proteins, 29 have a putative prion domain, and 12 1st and 10th among RRM-bearing prion candidates, form cytoplasmic inclusions in the degenerating RNA-binding proteostasis of TAF15, which is the 2nd ranked RRM-bearing prion candidate, has been con
IMIPreprint Series MATHEMATICS
South Carolina, University of
to a strongly coupled system of a degenerated nonlinear advection-di usion equation for saturation,operator-splittingtechnique in e ectively solving two-phase uid ow problems DEES90, EE87]. In practice, a reservoir often consists-phase ows with interfaces ?]. However, in the case of two-phase uid ows the saturation equation itself
Karlsen, Kenneth Hvistendahl
,Springer,Berlin,2000 NUMERICAL SOLUTION OF RESERVOIR FLOW MODELS BASED ON LARGE TIME STEP OPERATOR for the saturation equation, which is a convection dominated, degenerate convection-diffusion equation. Both theory and applications are discussed. The general background for the reservoir flow model is reviewed, and the main
This Week in The Journal F Cellular/Molecular
Gaser, Christian
--the primary mediator of pro- grammedcelldeath--couldpreventneuro- degeneration, Thompson and Brenowitz infused mounted in a backpack. HVC volume, soma size, and neuron number were greater in the infused nucleus than.Fur- thermore, neurons in a downstream target nucleus of HVC were larger on the infused side
ISOTROPIC ETCHING OF 111 SCS FOR WAFER-SCALE MANUFACTURING OF PERFECTLY HEMISPHERICAL SILICON MOLDS
Afshari, Ehsan
ISOTROPIC ETCHING OF 111 SCS FOR WAFER-SCALE MANUFACTURING OF PERFECTLY HEMISPHERICAL SILICON MOLDS as sacrificial molds for micro-scale hemispherical resonator gyroscopes (HRGs) made using hemispherical shell resonators. Geometric uniformity of the mold is critical for HRG applications in order to achieve degenerate
When Stars Blow Up What Stars Explode?
Walter, Frederick M.
When Stars Blow Up #12;What Stars Explode? Â·Cataclysmic variables Â·Novae Â·Supernovae #12;Cataclysmic Variables Â·Binary star systems incorporating a white dwarf Â·Outbursts due to disk instabilities the temperature reaches a few MK, fusion begins Â·Degenerate fusion is a runaway. Â·All the H fuses to He
CONDENSATION IN EJECTA FROM DENSE THERMONUCLEAR SUPERNOVAE. T. Yu1, B. S. Meyer1, A. V. Fedkin2 Thermonuclear Supernova Model: Thermonuclear (Type Ia) supernovae are explosions of white dwarf stars. Our model and then oxy- gen burning proceed under degenerate conditions, a thermonuclear runaway occurs, which leads
He, Limei
2000-01-01
, bacteria, viruses and nematodes, in cotton, resistance gene candidates were cloned by PCR using a pair of degenerate primers designed from the conserved sequences of disease resistance genes cloned from a variety of plant taxa. From a 96-clone sample, 23...
An Overview of High-Gain Targets for Inertial Fusion Energy
! Time! DT! DD! Advanced Fuels! Dual Density! High "$ Low "$ Two-Sided Drive! #12;Direct Drive (laser! Time! DT! DD! Advanced Fuels! Dual Density! High "$ Low "$ Two-Sided Drive! ~103-person- years require...... Cryogenic fuel compressed to high density, close to Fermi degenerate (FD) conditions !R"~0
DISCRETE AND CONTINUOUS doi:10.3934/dcdsb.2011.16.197 DYNAMICAL SYSTEMS SERIES B
Meron, Ehud
in current ecological research is un- derstanding and predicting desertification phenomena. Desertification of desertification, and means of restoring degraded regions, can be obtained and devised by studying the dynamics: 35K65. Key words and phrases. Desertification, Dryland Vegetation, parabolic equations, Degenerate
Manuscript submitted to Website: http://AIMsciences.org AIMS' Journals
Temam, Roger
and predicting desertification phenomena. Desertification is generally defined as a sudden and irreversible insight into the mechanisms and the precursors of desertification, and means of restoring degraded regionsK65. Key words and phrases. Desertification, Dryland Vegetation, parabolic equations, Degenerate
TO APPEAR IN MICCAI 2008. Lumbar Disc Localization and Labeling with a
Corso, Jason J.
] and recent [2] studies have suggested a need for repeatable quantitative inter- vertebral disc degeneration fragments of disc material to press on the nerve roots in the spinal column. In the clinic, a radiolo- gist, with possible bending of the spinal column (scoliosis) and missing or additional verte- brae [3]. In Figure 1
Devarajan, Keerthana
2011-07-28
. Sensory neural hearing loss (SNHL) is the most common form, which results from degeneration of inner ear sensory hair cells and auditory neurons in the cochlea. In recent years, there has been an increasing interest in gene delivery to mesenchymal stem...
Cosmic Supernova Rate History and Type Ia Supernova Progenitors
Chiaki Kobayashi; Ken'ichi Nomoto; Takuji Tsujimoto
2001-02-14
Adopting a single degenerate scenario for Type Ia supernova progenitors with the metallicity effect, we make a prediction of the cosmic supernova rate history as a composite of the supernova rates in spiral and elliptical galaxies, and compare with the recent observational data up to z ~ 0.55.
Palanker, Daniel
of the retina degenerates, yet the inner retinal neurons, the "processing circuitry" downstream from in retinal ganglion cells occurred at pulse durations near chronaxie--around 1.3 ms. Index Terms--Electrical stimulation, electroporation, neural prosthesis, neural stimulation, retinal prosthesis. I. INTRODUCTION AGE
SCHOOL OF DENTAL MEDICINE OFFICE OF RESEARCH BULLETIN
Mootha, Vamsi K.
work on bone-seeking isotopes as part of the Manhattan Project was followed by major works and cellular mechanisms of vascular anomalies Bjorn R. Olsen, MD, PhD NIH-NIAMS P01 This Program Project Grant degeneration. This Project entitled "Molecular and Cellular Mechanisms of Vascular Anomalies" aims to elucidate
Ram, Rajeev J.
Thermoelectric power factor enhancement by ionized nanoparticle scattering Je-Hyeong Bahk, Zhixi 15:21:35 #12;Thermoelectric power factor enhancement by ionized nanoparticle scattering Je 2011) We show theoretically that the thermoelectric power factor can be enhanced in degenerate
Predicting the amount of hydrogen stripped by the SN explosion for SN 2002cx-like SNe Ia
Liu, Zheng-Wei; Chen, X. F.; Wang, B.; Han, Z. W. [Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011 (China); Kromer, M. [Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85741 Garching (Germany); Fink, M.; Röpke, F. K. [Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg (Germany); Pakmor, R., E-mail: zwliu@ynao.ac.cn [Heidelberger Institut für Theoretische Studien, Schloss-Wolfsbrunnenweg 35, D-69118 Heidelberg (Germany)
2013-12-01
The most favored progenitor scenarios for Type Ia supernovae (SNe Ia) involve the single-degenerate (SD) scenario and the double-degenerate scenario. The absence of stripped hydrogen (H) in the nebular spectra of SNe Ia challenges the SD progenitor models. Recently, it was shown that pure deflagration explosion models of Chandrasekhar-mass white dwarfs, ignited off-center, reproduce the characteristic observational features of 2002cx-like SNe Ia very well. In this work we predict, for the first time, the amount of stripped H for the off-center, pure deflagration explosions. We find that their low kinetic energies lead to inefficient H mass stripping (? 0.01 M {sub ?}), indicating that the stripped H may be hidden in (observed) late-time spectra of SN 2002cx-like SNe Ia.
Level structure of {sup 103}Ag at high spin
Ray, S.; Pattabiraman, N. S.; Krishichayan,; Chakraborty, A.; Mukhopadhyay, S.; Ghugre, S. S.; Chintalapudi, S. N.; Sinha, A. K. [UGC-DAE Consortium for Scientific Research, Kolkata Centre, Sector III, LB-8, Bidhan Nagar, Kolkata 700 098 (India); Garg, U.; Zhu, S.; Kharraja, B.; Almehed, D. [Physics Department, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
2008-02-15
High spin states in {sup 103}Ag were investigated with the Gammasphere array by using the {sup 72}Ge({sup 35}Cl,2p2n){sup 103}Ag reaction at an incident beam energy of 135 MeV. A {delta}J=1 sequence with predominantly magnetic transitions and two nearly degenerate {delta}J=1 doublet bands have been observed. The dipole band shows a decreasing trend in the B(M1) strength as function of spin, a well-established feature of magnetic bands. The nearly degenerate band structures satisfy the three experimental signatures of chirality in the nuclei; however, microscopic calculations are indicative of a magnetic phenomena.
Photo-transport properties of Pb{sub 2}CrO{sub 5} single crystals
Mondal, P. S.; Okazaki, R. Taniguchi, H.; Terasaki, I.
2014-11-21
We report photo-thermoelectric transport phenomena in Pb{sub 2}CrO{sub 5} single crystals. Without illumination, this material exhibits an insulating behavior characterized by an activation-type temperature variation of the electrical conductivity. The Seebeck coefficient contrastingly shows a crossover from high-temperature insulating to low-temperature metallic behavior, which is attributed to degenerate carriers in a donor level. We have found that under illumination, both the conductivity and the Seebeck coefficient increase in magnitude with increasing photon flux density in the degenerate-conduction regime. This result is difficult to understand within a simple photo-doping effect, which usually leads to a decrease in the Seebeck coefficient under illumination. The observed phenomenon is discussed in terms of a two-carrier contribution to the transport properties.
Effect of electron flow on the ordinary-extraordinary mode conversion
Jia Guozhang; Gao Zhe
2011-10-15
Ordinary-extraordinary mode conversion in the electron cyclotron frequency range is revisited in the presence of a flowing electron component. The analytical expressions of optimal parallel refraction index and conversion efficiency are obtained from a one-dimensional cold plasma model. The presence of flowing electrons leads to an outward shift of the conversion layer and therefore increases the optimal value of parallel refraction index. If this effect is not considered, the efficiency of mode conversion degenerates. In typical tokamak plasmas, this degeneration is about a few percentages, which may induce the reflection of several tens of kilowatts of power from the cutoff layer when injecting megawatts of ECRF power into fusion plasma.
Strong Ultraviolet Pulse From a Newborn Type Ia Supernova
Cao, Yi; Howell, D Andrew; Gal-Yam, Avishay; Kasliwal, Mansi M; Valenti, Stefano; Johansson, J; Amanullah, R; Goobar, A; Sollerman, J; Taddia, F; Horesh, Assaf; Sagiv, Ilan; Cenko, S Bradley; Nugent, Peter E; Arcavi, Iair; Surace, Jason; Wo?niak, P R; Moody, Daniela I; Rebbapragada, Umaa D; Bue, Brian D; Gehrels, Neil
2015-01-01
Type Ia supernovae are destructive explosions of carbon oxygen white dwarfs. Although they are used empirically to measure cosmological distances, the nature of their progenitors remains mysterious, One of the leading progenitor models, called the single degenerate channel, hypothesizes that a white dwarf accretes matter from a companion star and the resulting increase in its central pressure and temperature ignites thermonuclear explosion. Here we report observations of strong but declining ultraviolet emission from a Type Ia supernova within four days of its explosion. This emission is consistent with theoretical expectations of collision between material ejected by the supernova and a companion star, and therefore provides evidence that some Type Ia supernovae arise from the single degenerate channel.
Holographic fluids with perturbations of pressure and energy density at finite cutoff surface
Ya-Peng Hu; Yu Tian; Xiao-Ning Wu; Hongsheng Zhang
2015-07-30
We investigate the holographic fluids with perturbations of pressure and energy density at finite cutoff surface in the scenario of gravity/fluid correspondence. Perturbing the Schwarzschild-AdS black brane solution in the Einstein gravity, we explore the stress tensor of the holographic fluids with transport coefficients at a finite cutoff surface. We set a non-zero boundary condition for the derivative of $h(r)$ with respect to the radius direction $r$. We find that this boundary condition is critical to break the apparent degeneration of bulk viscosity and perturbation of the pressure for the dual fluid at the finite cutoff surface in our previous work (Phys.Lett. B732 (2014) 298). After this apparent degeneration broken, the bulk viscosity disappears, which is confirmed by the consideration of sound velocity.
Power-efficient production of photon pairs in a tapered chalcogenide microwire
Evan Meyer-Scott; Audrey Dot; Raja Ahmad; Lizhu Li; Martin Rochette; Thomas Jennewein
2015-02-25
Using tapered fibers of As2Se3 chalcogenide glass, we produce photon pairs at telecommunication wavelengths with low pump powers. We found maximum coincidences-to-accidentals ratios of $2.13\\pm0.07$ for degenerate pumping with 3.2 {\\mu}W average power, and $1.33\\pm0.03$ for non-degenerate pumping with 1.0 {\\mu}W and 1.5 {\\mu}W average power of the two pumps. Our results show that the ultrahigh nonlinearity in these microwires could allow single-photon pumping to produce photon pairs, enabling the production of large entangled states, heralding of single photons after lossy transmission, and photonic quantum information processing with nonlinear optics.
Electron conduction along quantizing magnetic fields in neutron star crusts. II. Practical formulae
A. Y. Potekhin; D. G. Yakovlev
1997-07-18
Practical expressions are derived for a rapid and accurate evaluation of electric and thermal conductivities and thermopower of degenerate relativistic electrons along quantizing magnetic fields in outer neutron star crusts. The electron Coulomb scattering on ions is considered in liquid matter, and on high-temperature phonons or charged impurities in solid matter. A semi-quantitative treatment of low-temperature phonons is also proposed. The transport properties are expressed through the energy dependent effective electron relaxation time, which is calculated using the theoretical formalism of the previous work (astro-ph/9603133). Accurate fitting expressions for the relaxation time are obtained, and an efficient energy averaging procedure proposed. A Fortran code, which calculates the longitudinal transport properties of degenerate electrons in strong magnetic fields for any parameters of dense stellar matter of practical interest, is available from the authors upon request.
A HIGH-RESOLUTION SPECTROSCOPIC SEARCH FOR THE REMAINING DONOR FOR TYCHO'S SUPERNOVA
Kerzendorf, Wolfgang E.; Yong, David; Schmidt, Brian P.; Murphy, Simon J.; Bessell, Michael S. [Research School of Astronomy and Astrophysics, Mount Stromlo Observatory, Cotter Road, Weston Creek, ACT 2611 (Australia); Simon, Joshua D. [Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Jeffery, C. Simon [Armagh Observatory, College Hill, Armagh BT61 9DG (United Kingdom); Anderson, Jay [Space Telescope Science Institute, Baltimore, MD 21218 (United States); Podsiadlowski, Philipp [Department of Astrophysics, University of Oxford, Oxford, OX1 3RH (United Kingdom); Gal-Yam, Avishay [Benoziyo Center for Astrophysics, Faculty of Physics, Weizmann Institute of Science, Rehovot 76100 (Israel); Silverman, Jeffrey M.; Filippenko, Alexei V. [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); Nomoto, Ken'ichi [Kavli Institute for the Physics and Mathematics of the Universe, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 (Japan); Venn, Kim A. [Department of Physics and Astronomy, University of Victoria, Elliott Building, 3800 Finnerty Road, Victoria, BC V8P 5C2 (Canada); Foley, Ryan J., E-mail: wkerzend@mso.anu.edu.au [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
2013-09-10
In this paper, we report on our analysis using Hubble Space Telescope astrometry and Keck-I HIRES spectroscopy of the central six stars of Tycho's supernova remnant (SN 1572). With these data, we measured the proper motions, radial velocities, rotational velocities, and chemical abundances of these objects. Regarding the chemical abundances, we do not confirm the unusually high [Ni/Fe] ratio previously reported for Tycho-G. Rather, we find that for all metrics in all stars, none exhibit the characteristics expected from traditional Type Ia supernova single-degenerate-scenario calculations. The only possible exception is Tycho-B, a rare, metal-poor A-type star; however, we are unable to find a suitable scenario for it. Thus, we suggest that SN 1572 cannot be explained by the standard single-degenerate model.
Speed-up of combustion fronts in shear flows
Hamel, Francois
2011-01-01
This paper is concerned with the analysis of speed-up of reaction-diffusion-advection traveling fronts in infinite cylinders with periodic boundary conditions. The advection is a shear flow with a large amplitude and the reaction is nonnegative, with either positive or zero ignition temperature. The unique or minimal speeds of the traveling fronts are proved to be asymptotically linear in the flow amplitude as the latter goes to infinity, solving an open problem from \\cite{b}. The asymptotic growth rate is characterized explicitly as the unique or minimal speed of traveling fronts for a limiting degenerate problem, and the convergence of the regular traveling fronts to the degenerate ones is proved for positive ignition temperatures under an additional H{\\"{o}}rmander-type condition on the flow.
Ab-initio Gorkov-Green's function calculations of open-shell nuclei
V. Soma; C. Barbieri; T. Duguet
2012-08-13
We present results from a new ab-initio method that uses the self-consistent Gorkov Green's function theory to address truly open-shell systems. The formalism has been recently worked out up to second order and is implemented here in nuclei for the first time on the basis of realistic nuclear forces. We find good convergence of the results with respect to the basis size in Ca44 and Ni74 and discuss quantities of experimental interest including ground-state energies, pairing gaps and particle addition/removal spectroscopy. These results demonstrate that the Gorkov method is a valid alternative to multireference approaches for tackling degenerate or near degenerate quantum systems. In particular, it increases the number of mid-mass nuclei accessible in an ab-initio fashion from a few tens to a few hundreds.
Metal Alloy Compositions And Process Background Of The Invention
Flemings, Merton C. (Cambridge, MA); Martinez-Ayers, Raul A. (Somerville, MA); de Figueredo, Anacleto M. (Newton, MA); Yurko, James A. (Boston, MA)
2003-11-11
A skinless metal alloy composition free of entrapped gas and comprising primary solid discrete degenerate dendrites homogeneously dispersed within a secondary phase is formed by a process wherein the metal alloy is heated in a vessel to render it a liquid. The liquid is then rapidly cooled while vigorously agitating it under conditions to avoid entrapment of gas while forming solid nuclei homogeneously distributed in the liquid. Agitation then is ceased when the liquid contains a small fraction solid or the liquid-solid alloy is removed from the source of agitation while cooling is continued to form the primary solid discrete degenerate dendrites in liquid secondary phase. The solid-liquid mixture then can be formed such as by casting.
On the Brightness of Surviving Companions in Type Ia Supernova Remnants
Noda, Kazuhiro; Shigeyama, Toshikazu
2015-01-01
The progenitor systems for type Ia supernovae are still controversial. One of the methods to test the proposed scenario for the progenitor systems is to identify companions that are supposed to survive according to the so-called single degenerate scenario. These companions might be affected by supernova ejecta. We present several numerical simulations of surviving red-giant companions whose envelopes were stripped and heated. We find that red-giants with less-massive helium cores ($\\lesssim0.30\\,M_{\\odot}$) can be so faint after the supernovae that we cannot detect them. In addition, we apply the results to the case of SNR 0509-67.5, and put constraints on the helium core mass, envelope stripping, and energy injection under the single degenerate scenario for type Ia supernovae.
Self-similar expansion of a warm dense plasma
Djebli, Mourad [USTHB, Faculty of Physics, Theoretical Physics Laboratory, B.P. 32 Bab-Ezzouar, 16079 Algiers (Algeria)] [USTHB, Faculty of Physics, Theoretical Physics Laboratory, B.P. 32 Bab-Ezzouar, 16079 Algiers (Algeria); Moslem, Waleed M. [Department of Physics, Faculty of Science, Port Said University, Port Said (Egypt)] [Department of Physics, Faculty of Science, Port Said University, Port Said (Egypt)
2013-07-15
The properties of an expanding plasma composed of degenerate electron fluid and non-degenerate ions are studied. For our purposes, we use fluid equations for ions together with the electron momentum equation that include quantum forces (e.g., the quantum statistical pressure, forces due to the electron-exchange and electron correlations effects) and the quasi-neutrality condition. The governing equation is written in a tractable form by using a self-similar transformation. Numerical results for typical beryllium plasma parameters revealed that, during the expansion, the ion acoustic speed decreases for both isothermal and adiabatic ion pressure. When compared with classical hydrodynamic plasma expansion model, the electrons and ions are found to initially escape faster in vacuum creating thus an intense electric field that accelerates most of the particles into the vacuum ahead of the plasma expansion. The relevancy of the present model to beryllium plasma produced by a femto-second laser is highlighted.
PeV Scale Right Handed Neutrino Dark Matter in $S_4$ Flavor Symmetric extra U(1) model
Yasuhiro Daikoku; Hiroshi Okada
2015-03-28
Recent observation of high energy neutrino in IceCube experiment suggests existence of superheavy dark matter beyond PeV. We identify the parent particles of neutrino as two degenerated right handed neutrinos, assuming the dark matter is the heaviest right handed neutrino. The $O(V_{cb})\\sim O(10^{-2})$ flavor symmetry breaking accounts for the $O(10^{-4})$ mass degeneracy of right handed neutrinos which is a sizable scale to explain the successful resonant leptogenesis at the PeV scale. At the same time, non-thermal production of the heaviest right handed neutrino gives the right amount of dark matter for $T_{RH}\\sim 10$PeV. The footprint of flavor symmetry is left in degenerated mass spectra of extra Higgs multiplet and colored Higgs multiplet which may be testable for LHC or future colliders.
Yan-Xiao Gong; Zhen-Da Xie; Ping Xu; Xiao-Qiang Yu; Peng Xue; Shi-Ning Zhu
2011-12-20
We propose a scheme for the generation of counterpropagating polarization-entangled photon pairs from a dual-periodically poled crystal. Compared with the usual forward-wave type source, this source, in the backward-wave way, has a much narrower bandwidth. With a 2-cm-long bulk crystal, the bandwidths of the example sources are estimated to be 3.6 GHz, and the spectral brightnesses are more than 100 pairs/(s GHz mW). Two concurrent quasi-phase-matched spontaneous parametric down-conversion processes in a single crystal enable our source to be compact and stable. This scheme does not rely on any state projection and applies to both degenerate and non-degenerate cases, facilitating applications of the entangled photons.
Harmonic oscillator in a background magnetic field in noncommutative quantum phase-space
Joseph Ben Geloun; Sunandan Gangopadhyay; Frederik G Scholtz
2009-01-22
We solve explicitly the two-dimensional harmonic oscillator and the harmonic oscillator in a background magnetic field in noncommutative phase-space without making use of any type of representation. A key observation that we make is that for a specific choice of the noncommutative parameters, the time reversal symmetry of the systems get restored since the energy spectrum becomes degenerate. This is in contrast to the noncommutative configuration space where the time reversal symmetry of the harmonic oscillator is always broken.
Hydrodynamic equations for electrons in graphene obtained from the maximum entropy principle
Barletti, Luigi
2014-08-15
The maximum entropy principle is applied to the formal derivation of isothermal, Euler-like equations for semiclassical fermions (electrons and holes) in graphene. After proving general mathematical properties of the equations so obtained, their asymptotic form corresponding to significant physical regimes is investigated. In particular, the diffusive regime, the Maxwell-Boltzmann regime (high temperature), the collimation regime and the degenerate gas limit (vanishing temperature) are considered.
A non-symmetric Yang-Baxter algebra for the quantum nonlinear Schrödinger model (PhD Thesis)
Bart Vlaar
2013-03-26
We study certain non-symmetric wavefunctions associated to the quantum nonlinear Schr\\"odinger (QNLS) model, introduced by Komori and Hikami using representations of the degenerate affine Hecke algebra. In particular, they can be generated using a vertex operator formalism analogous to the recursion that defines the symmetric QNLS wavefunction in the quantum inverse scattering method. Furthermore, some of the commutation relations encoded in the Yang-Baxter equation are generalized to the non-symmetric case.
A review of "Giovanni Baglione: Artistic Reputation in Baroque Rome." by Maryvelma Smith O’Neil,
Jeffrey Fontana
2005-01-01
Vasari in Florence during the third quarter of the sixteenth century, and like Vasari Baglione is valued today more for his collection of artists? biographies than for his paintings. Baglione brought a lawsuit for libel against Caravaggio and three... O?Neil gives a chronological presentation of Baglione?s commissions for the better part of his career, from 1604 until 1632 when his vision degenerated to the point that he virtually gave up painting. By illustrating the succession of major...
On the hypermultiplet theories
Saidi, E.H. (Lab. of Theoretical Physics, Av. Ibn Batouta, P.O. Box 1014, Rabat (MA))
1988-01-01
Using the harmonic superspace techniques, the authors show that the hypermultiplet can be either massive (massless) with or without central charges. They found that the HST hypermultiplet has a degenerate structure. In the case of the absence of central charges, the corresponding mass terms are constructed and they turn out to be similar to those obtained from central charges. A class of infinitesimal duality transformations for free hypermultiplet theory is given.
Low-energy U(1) x USp(2M) gauge theory from simple high-energy gauge group
Sven Bjarke Gudnason; Kenichi Konishi
2010-05-17
We give an explicit example of the embedding of a near BPS low-energy (U(1) x USp(2M))/Z_2 gauge theory into a high-energy theory with a simple gauge group and adjoint matter content. This system possesses degenerate monopoles arising from the high-energy symmetry breaking as well as non-Abelian vortices due to the symmetry breaking at low energies. These solitons of different codimensions are related by the exact homotopy sequences.
Quark Masses and Chiral Symmetry
Michael Creutz
1995-05-18
I discuss the global structure of the strongly interacting gauge theory of quarks and gluons as a function of the quark masses and the CP violating parameter $\\theta$. I concentrate on whether a first order phase transition occurs at $\\theta=\\pi.$ I show why this is expected when multiple flavors have a small degenerate mass. This transition can be removed by sufficient flavor-breaking. I speculate on the implications of this structure for Wilson's lattice fermions.
Identifying Dark Matter Burners in the Galactic center
Igor V. Moskalenko; Lawrence L. Wai
2007-04-11
If the supermassive black hole (SMBH) at the center of our Galaxy grew adiabatically, then a dense "spike" of dark matter is expected to have formed around it. Assuming that dark matter is composed primarily of weakly interacting massive particles (WIMPs), a star orbiting close enough to the SMBH can capture WIMPs at an extremely high rate. The stellar luminosity due to annihilation of captured WIMPs in the stellar core may be comparable to or even exceed the luminosity of the star due to thermonuclear burning. The model thus predicts the existence of unusual stars, i.e. "WIMP burners", in the vicinity of an adiabatically grown SMBH. We find that the most efficient WIMP burners are stars with degenerate electron cores, e.g. white dwarfs (WD) or degenerate cores with envelopes. If found, such stars would provide evidence for the existence of particle dark matter and could possibly be used to establish its density profile. In our previous paper we computed the luminosity from WIMP burning for a range of dark matter spike density profiles, degenerate core masses, and distances from the SMBH. Here we compare our results with the observed stars closest to the Galactic center and find that they could be consistent with WIMP burners in the form of degenerate cores with envelopes. We also cross-check the WIMP burner hypothesis with the EGRET observed flux of gamma-rays from the Galactic center, which imposes a constraint on the dark matter spike density profile and annihilation cross-section. We find that the EGRET data is consistent with the WIMP burner hypothesis. New high precision measurements by GLAST will confirm or set stringent limits on a dark matter spike at the Galactic center, which will in turn support or set stringent limits on the existence of WIMP burners at the Galactic center.
The World of Dark Shadows Issue 31
Multiple Contributors
1982-01-01
; Jensen, 1964, 1965, 1968a, 1968b; Jensen and Fisher, 1967, 1968a; Joshi et al., 1967; Pollock and Jensen, 1964; Reeves and Beasley, 1935; Schultz and Jensen, 1977). Megasporogenesis and megagametogenesis result in formation of an 8-nucleate, 7-celled... is destroyed by entrance of the pollen tube, whereas Jensen and Fisher (1968a) observed one synergid begins to break down at the time of pollination. The degenerating synergid remains in contact with the egg and the central cells during the process...
Superconductors with Topological Order
M. C. Diamantini; P. Sodano; C. A. Trugenberger
2005-11-18
We propose a mechanism of superconductivity in which the order of the ground state does not arise from the usual Landau mechanism of spontaneous symmetry breaking but is rather of topological origin. The low-energy effective theory is formulated in terms of emerging gauge fields rather than a local order parameter and the ground state is degenerate on topologically non-trivial manifolds. The simplest example of this mechanism of superconductivty is concretely realized as global superconductivty in Josephson junction arrays.
Hybrid Monte Carlo with Wilson Dirac operator on the Fermi GPU
Abhijit Chakrabarty; Pushan Majumdar
2012-07-10
In this article we present our implementation of a Hybrid Monte Carlo algorithm for Lattice Gauge Theory using two degenerate flavours of Wilson-Dirac fermions on a Fermi GPU. We find that using registers instead of global memory speeds up the code by almost an order of magnitude. To map the array variables to scalars, so that the compiler puts them in the registers, we use code generators. Our final program is more than 10 times faster than a generic single CPU.
Delta-rho in an SU(2) X U(1) chiral Yukawa model
J. L. Alonso; Ph. Boucaud; A. J. van der Sijs
1995-09-18
We report on a simulation in progress of an SU(2) X U(1) fermion-Higgs model with two *non-degenerate* fermion doublets. The Zaragoza proposal for chiral lattice fermions is used; naive fermions are studied for comparison. The aims of this simulation are a non-perturbative study of the decoupling of species doublers, of triviality bounds on the Higgs and fermion masses and of the phenomenological quantity Delta-rho.
Two-color ghost interference with photon pairs generated in hot atoms
Ding Dongsheng; Zhou Zhiyuan; Shi Baosen; Zou Xubo; Guo Guangcan [Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026 (China)
2012-09-15
We report on an experimental observation of a two-photon ghost interference experiment. A distinguishing feature of our experiment is that the photons are generated via a non-degenerated spontaneous four-wave mixing process in a hot atomic ensemble; therefore the photon has narrow bandwidth. Besides, there is a large difference in frequency between two photons in a pair. Our works may be important to achieve more secure, large transmission capacity long-distance quantum communication.
The subchronic toxicity of Roridin A in sheep
Thormahlen, Keller Andrew
1988-01-01
synclranms (5, 6) . However, in 1967 a toxic outbreak occurred in Russia on rye straw infected with ecium verrucaria, which is frequently seen to occur in the same colonies as Nyrothecium roridum (9) . Unfortunately, these isolates have yet to reproduce... aminotransferase (AST) . 'Ihe disease is characterized by a fatty cirrhosis of the liver starting first as a fatty infiltration organizing itself within the ~yma su~ing the portal vein, the hepatic ~, and the bile duct. This fatty degeneration ~ a fibrogenic...
Effective range function below threshold
A. Deloff
2000-06-26
We demonstrate that the kernel of the Lippmann-Schwinger equation, associated with interactions consisting of a sum of the Coulomb plus a short range nuclear potential, below threshold becomes degenerate. Taking advantage of this fact, we present a simple method of calculating the effective range function for negative energies. This may be useful in practice since the effective range expansion extrapolated to threshold allows to extract low-energy scattering parameters: the Coulomb-modified scattering length and the effective range.
Simulating the Haldane Phase in Trapped Ion Spins Using Optical Fields
I. Cohen; P. Richerme; Z. -X. Gong; C. Monroe; A. Retzker
2015-05-20
We propose to experimentally explore the Haldane phase in spin-one XXZ antiferromagnetic chains using trapped ions. We show how to adiabatically prepare the ground states of the Haldane phase, demonstrate their robustness against sources of experimental noise, and propose ways to detect the Haldane ground states based on their excitation gap and exponentially decaying correlations, nonvanishing nonlocal string order, and doubly-degenerate entanglement spectrum.
Filippo Fratini; Sergiy Trotsenko; Stanislav Tashenov; Thomas Stoehlker; Andrey Surzhykov
2011-03-27
Due to electron-nucleus weak interaction, atomic bound states with different parities turn out to be mixed. We discuss a prospect for measuring the mixing parameter between the nearly degenerate metastable states 1s_{1/2} 2s_{1/2} : J = 0 and 1s_{1/2} 2p_{1/2} : J = 0 in heliumlike Uranium. Our analysis is based on the polarization properties of the photons emitted in the two-photon decays of such states.
Mass Splitting of Staggered Fermion and $SO(2D)$ Clifford Algebra
M. Hatakeyama; H. Sawanaka; H. So
2006-09-28
We present a new method to introduce rotationally invariant terms in staggered fermions which is based on an $SO(2D)$ Clifford algebra formulation, where $D$ means the number of space-time dimensions. We have four candidates for improved mass terms that can split the degenerate mass of staggered fermions. Among them, we analyze three types of combinations and find only one case that can identify with the light single Dirac mode.
Moon, Jaewoong
2009-05-15
.?????????????????????. 28 3-2. Flow chart of JA-signaling mutant screening???????????? 31 3-3. Maps of T-DNAs for making mutant library????????????. 35 3-4. Recovery of genomic sequences flanking T-DNA by TAIL-PCR using three left border primers (LB...1, LB2, LB3) and arbitrary degenerate primer (AD)????????????????????......??????. 36 3-5. T-DNA primer design for diagnostic PCR ????????????... 40 3-6. Two recombination reactions in gateway technology..????????.. 51 3...
Type Ia Supernovae: Toward the Standard Model?
David Branch
2000-12-13
In this short review I suggest that recent developments support the conjecture that Type Ia supernovae (SNe Ia) are the complete disruptions of Chandrasekhar-mass carbon-oxygen white dwarfs in single-degenerate binary systems. The causes of the observational diversity of SNe Ia within the context of this standard model, and the implications of the model for young remnants of SNe Ia, are briefly discussed.
Acute monensin toxicosis in broiler chickens
Hanrahan, Lynn Allen
1979-01-01
Acute Monensin Toxicosis in Broiler Chickens. (December 1979) Lynn Allen Hanrahan, B. S. , D. V. M. , Purdue University Chairman of Advisory Comnittee: Dr. Donald E. Carrier The toxic effects of monensin were studied in 3 groups of broiler chickens... in fatty degeneration of aerobic striated muscle and coagulative necrosis in the aerobic (red) skeletal rmscle. ACKNOWLEDGEMENTS The author is sincerely appreciative of the guidance and counsel of Dr. D. E. Corrier of the Department of Veterinary...
Aging management guideline for commercial nuclear power plants - heat exchangers
Booker, S.; Lehnert, D.; Daavettila, N.; Palop, E.
1994-06-01
This Aging Management Guideline (AMG) describes recommended methods for effective detection and mitigation of age-related degradation mechanisms in commercial nuclear power plant heat exchangers important to license renewal. The intent of this AMG is to assist plant maintenance and operations personnel in maximizing the safe, useful life of these components. It also supports the documentation of effective aging management programs required under the License Renewal Rule 10 CFR 54. This AMG is presented in a manner that allows personnel responsible for performance analysis and maintenance to compare their plant-specific aging mechanisms (expected or already experienced) and aging management program activities to the more generic results and recommendations presented herein.
Weiss, A J [comp.
1984-05-01
The projects reported are the following: High Temperature Reactor Research, SSC Development, Validation and Application, CRBR Balance of Plant Modeling, Thermal-Hydraulic Reactor Safety Experiments, Development of Plant Analyzer, Code Assessment and Application (Transient and LOCA Analyses), Thermal Reactor Code Development (RAMONA-3B), Calculational Quality Assurance in Support of PTS; Stress Corrosion Cracking of PWR Steam Generator Tubing, Bolting Failure Analysis, Probability Based Load Combinations for Design of Category I Structures, Mechanical Piping Benchmark Problems, Identification of Age-Related Failure Modes; Analysis of Human Error Data for Nuclear Power Plant Safety-Related Events, Human Factors in Nuclear Power Plant Safeguards, Emergency Action Levels, and Protective Action Decision Making.
Health monitoring method for composite materials
Watkins, Jr., Kenneth S. (Dahlonega, GA); Morris, Shelby J. (Hampton, VA)
2011-04-12
An in-situ method for monitoring the health of a composite component utilizes a condition sensor made of electrically conductive particles dispersed in a polymeric matrix. The sensor is bonded or otherwise formed on the matrix surface of the composite material. Age-related shrinkage of the sensor matrix results in a decrease in the resistivity of the condition sensor. Correlation of measured sensor resistivity with data from aged specimens allows indirect determination of mechanical damage and remaining age of the composite component.
Levy, Mel, E-mail: ayers@mcmaster.ca, E-mail: mlevy@tulane.edu [Department of Chemistry, Duke University, Durham, North Carolina 27708 (United States) [Department of Chemistry, Duke University, Durham, North Carolina 27708 (United States); Department of Physics, North Carolina A and T State University, Greensboro, North Carolina 27411 (United States); Department of Chemistry, Tulane University, New Orleans, Louisiana 70118 (United States); Anderson, James S. M.; Zadeh, Farnaz Heidar; Ayers, Paul W., E-mail: ayers@mcmaster.ca, E-mail: mlevy@tulane.edu [Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario (Canada)
2014-05-14
Properties of exact density functionals provide useful constraints for the development of new approximate functionals. This paper focuses on convex sums of ground-level densities. It is observed that the electronic kinetic energy of a convex sum of degenerate ground-level densities is equal to the convex sum of the kinetic energies of the individual degenerate densities. (The same type of relationship holds also for the electron-electron repulsion energy.) This extends a known property of the Levy-Valone Ensemble Constrained-Search and the Lieb Legendre-Transform refomulations of the Hohenberg-Kohn functional to the individual components of the functional. Moreover, we observe that the kinetic and electron-repulsion results also apply to densities with fractional electron number (even if there are no degeneracies), and we close with an analogous point-wise property involving the external potential. Examples where different degenerate states have different kinetic energy and electron-nuclear attraction energy are given; consequently, individual components of the ground state electronic energy can change abruptly when the molecular geometry changes. These discontinuities are predicted to be ubiquitous at conical intersections, complicating the development of universally applicable density-functional approximations.
Im, Myungshin; Yoon, Sung-Chul; Kim, Jae-Woo; Ehgamberdiev, Shuhrat A; Monard, Libert A G; Sung, Hyun-Il
2015-01-01
The main progenitor candidate of Type Ia supernovae (SNe Ia) is white dwarfs in binary systems where the companion star is another white dwarf (double degenerate system) or a less evolved non-degenerate star with R* >~ 0.1 Rsun (single degenerate system), but no direct observational evidence exists that tells which progenitor system is more common. Recent studies suggest that the light curve of a supernova shortly after its explosion can be used to set a limit on the progenitor size, R*. Here, we report a high cadence monitoring observation of SN 2015F, a normal SN Ia, in the galaxy NGC 2442 starting about 84 days before the first light time. With our daily cadence data, we catch the emergence of the radioactively powered light curve, but more importantly detect with a > 97.4% confidence a possible dim precursor emission that appears at roughly 1.5 days before the rise of the radioactively powered emission. The signal is consistent with theoretical expectations for a progenitor system involving a companion st...
Search for surviving companions in type Ia supernova remnants
Pan, Kuo-Chuan [Physik Department, Universität Basel, Klingelbergstrasse 82, CH-4056 Basel (Switzerland); Ricker, Paul M. [Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 West Green Street, Urbana, IL 61801 (United States); Taam, Ronald E., E-mail: kuo-chuan.pan@unibas.ch, E-mail: pmricker@illinois.edu, E-mail: r-taam@northwestern.edu, E-mail: taam@asiaa.sinica.edu.tw [Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 (United States)
2014-09-01
The nature of the progenitor systems of type Ia supernovae (SNe Ia) is still unclear. One way to distinguish between the single-degenerate scenario and double-degenerate scenario for their progenitors is to search for the surviving companions (SCs). Using a technique that couples the results from multi-dimensional hydrodynamics simulations with calculations of the structure and evolution of main-sequence- (MS-) and helium-rich SCs, the color and magnitude of MS- and helium-rich SCs are predicted as functions of time. The SC candidates in Galactic type Ia supernova remnants (Ia SNR) and nearby extragalactic Ia SNRs are discussed. We find that the maximum detectable distance of MS SCs (helium-rich SCs) is 0.6-4 Mpc (0.4-16 Mpc), if the apparent magnitude limit is 27 in the absence of extinction, suggesting that the Large and Small Magellanic Clouds and the Andromeda Galaxy are excellent environments in which to search for SCs. However, only five Ia SNRs have been searched for SCs, showing little support for the standard channels in the singe-degenerate scenario. To better understand the progenitors of SNe Ia, we encourage the search for SCs in other nearby Ia SNRs.
Brick Walls for Black Holes in AdS/CFT
Norihiro Iizuka; Seiji Terashima
2015-01-01
We study the 't Hooft's brick wall model for black holes in a holographic context. The brick wall model suggests that without an appropriate near horizon IR cut-off, the free energy of the probe fields show the divergence due to the large degenerate states near the horizons. After studying the universal nature of the divergence in various holographic setting in various dimensions, we interpret the nature of the divergence in a holographic context. The free energy divergence is due to the large degeneracy and continuity of the low energy spectrum in the boundary theory at the deconfinement phase. These divergence and continuity should be removed by finite N effects, which make the spectrum discrete even at the deconfinement phase. On the other hand, in the bulk, these degenerate states are localized near the horizon, and the universal divergence of these degenerate states implies that the naive counting of the degrees of freedom in bulk should be modified once we take into account the non-perturbative quantum gravity effects near the horizon. Depending on the microscopic degrees of freedom, the position, where the effective field theory description to count the states breaks down, has different Planck scale dependence. It also implies the difficulty to have an electron like gauge-singlet elementary field in the boundary theory Lagrangian. These singlet fields are at most composite fields, because they show divergent free energy, suggesting a positive power of N at the deconfinement phase.
Folding a protein with equal probability of being helix or hairpin
Chun-Yu Lin; Nan-Yow Chen; Chung-Yu Mou
2011-12-01
We explore the possibility for the native state of a protein being inherently a multi-conformation state in an ab initio coarse-grained model. Based on the Wang-Landau algorithm, the complete free energy landscape for the designed sequence 2D4X: INYWLAHAKAGYIVHWTA is constructed. It is shown that 2DX4 possesses two nearly degenerate native states: one has a helix structure, while the other has a hairpin structure and their energy difference is less than 2% of that of local minimums. Two degenerate native states are stabilized by an energy barrier of the order 10kcal/mol. Furthermore, the hydrogen-bond and dipole-dipole interactions are found to be two major competing interactions in transforming one conformation into the other. Our results indicate that degenerate native states are stabilized by subtle balance between different interactions in proteins; furthermore, for small proteins, degeneracy only happens for proteins of sizes being around 18 amino acids or 40 amino acids. These results provide important clues to the study of native structures of proteins.
The Remarkable Deaths of 9 - 11 Solar Mass Stars
Woosley, S E
2015-01-01
The post-helium burning evolution of stars from 7 to 11 solar masses is complicated by the lingering effects of degeneracy and off-center ignition. Here stars in this mass range are studied using a standard set of stellar physics. Two important aspects of the study are the direct coupling of a reaction network of roughly 220 nuclei to the structure calculation at all stages and the use of a sub grid model to describe the convective bounded flame that develops during neon and oxygen burning. Below 9.0 solar masses, degenerate oxygen-neon cores form that may become either white dwarfs or electron-capture supernovae. Above 10.3 solar masses the evolution proceeds "normally" to iron-core collapse, without composition inversions or degenerate flashes. Emphasis here is upon the stars in between which typically ignite oxygen burning off center. After oxygen burns in a convectively bounded flame, silicon burning ignites in a degenerate flash that commences closer to the stellar center and with increasing violence for...
N. J. S. Loft; A. S. Dehkharghani; N. P. Mehta; A. G. Volosniev; N. T. Zinner
2015-03-10
We study a three-body system with zero-range interactions in a one-dimensional harmonic trap. The system consists of two spin-polarized fermions and a third particle which is distinct from two others (2+1 system). First we assume that the particles have equal masses. For this case the system in the strongly and weakly interacting limits can be accurately described using wave function factorized in hyperspherical coordinates. Inspired by this result we propose an interpolation ansatz for the wave function for arbitrary repulsive zero-range interactions. By comparison to numerical calculations, we show that this interpolation scheme yields an extremely good approximation to the numerically exact solution both in terms of the energies and also in the spin-resolved densities. As an outlook, we discuss the case of mass imbalanced systems in the strongly interacting limit. Here we find spectra that demonstrate that the triply degenerate spectrum at infinite coupling strength of the equal mass case is in some sense a singular case as this degeneracy will be broken down to a doubly degenerate or non-degenerate ground state by any small mass imbalance.
Arinilhaq,; Widita, Rena [Department of Physics, Nuclear Physics and Biophysics Research Group, Institut Teknologi Bandung (Indonesia)
2014-09-30
Optical Coherence Tomography is often used in medical image acquisition to diagnose that change due easy to use and low price. Unfortunately, this type of examination produces a two-dimensional retinal image of the point of acquisition. Therefore, this study developed a method that combines and reconstruct 2-dimensional retinal images into three-dimensional images to display volumetric macular accurately. The system is built with three main stages: data acquisition, data extraction and 3-dimensional reconstruction. At data acquisition step, Optical Coherence Tomography produced six *.jpg images of each patient were further extracted with MATLAB 2010a software into six one-dimensional arrays. The six arrays are combined into a 3-dimensional matrix using a kriging interpolation method with SURFER9 resulting 3-dimensional graphics of macula. Finally, system provides three-dimensional color graphs based on the data distribution normal macula. The reconstruction system which has been designed produces three-dimensional images with size of 481 × 481 × h (retinal thickness) pixels.
A seismic approach to testing different formation channels of subdwarf B stars
Haili Hu; M. -A. Dupret; C. Aerts; G. Nelemans; S. D. Kawaler; A. Miglio; J. Montalban; R. Scuflaire
2008-08-22
There are many unknowns in the formation of subdwarf B stars. Different formation channels are considered to be possible and to lead to a variety of helium-burning subdwarfs. All seismic models to date, however, assume that a subdwarf B star is a post-helium-flash-core surrounded by a thin inert layer of hydrogen. We examine an alternative formation channel, in which the subdwarf B star originates from a massive (>~2 Msun) red giant with a non-degenerate helium-core. Although these subdwarfs may evolve through the same region of the log g-Teff diagram as the canonical post-flash subdwarfs, their interior structure is rather different. We examine how this difference affects their pulsation modes and whether it can be observed. Using detailed stellar evolution calculations we construct subdwarf B models from both formation channels. The iron accumulation in the driving region due to diffusion, which causes the excitation of the modes, is approximated by a Gaussian function. The pulsation modes and frequencies are calculated with a non-adiabatic pulsation code. A detailed comparison of two subdwarf B models from different channels, but with the same log g and Teff, shows that their mode excitation is different. The excited frequencies are lower for the post-flash than for the post-non-degenerate subdwarf B star. This is mainly due to the differing chemical composition of the stellar envelope. A more general comparison between two grids of models shows that the excited frequencies of most post-non-degenerate subdwarfs cannot be well-matched with the frequencies of post-flash subdwarfs. In the rare event that an acceptable seismic match is found, additional information, such as mode identification and log g and Teff determinations, allows us to distinguish between the two formation channels.
Diego Noja; Dmitry Pelinovsky; Gaukhar Shaikhova
2014-12-28
We develop a detailed rigorous analysis of edge bifurcations of standing waves in the nonlinear Schr\\"odinger (NLS) equation on a tadpole graph (a ring attached to a semi-infinite line subject to the Kirchhoff boundary conditions at the junction). It is shown in the recent work [7] by using explicit Jacobi elliptic functions that the cubic NLS equation on a tadpole graph admits a rich structure of standing waves. Among these, there are different branches of localized waves bifurcating from the edge of the essential spectrum of an associated Schr\\"odinger operator. We show by using a modified Lyapunov-Schmidt reduction method that the bifur- cation of localized standing waves occurs for every positive power nonlinearity. We distinguish a primary branch of never vanishing standing waves bifurcating from the trivial solution and an infinite sequence of higher branches with oscillating behavior in the ring. The higher branches bifurcate from the branches of degenerate standing waves with vanishing tail outside the ring. Moreover, we analyze stability of bifurcating standing waves. Namely, we show that the primary branch is composed by orbitally stable standing waves for subcritical power nonlinearities, while all nontrivial higher branches are linearly unstable near the bifurcation point. The stability character of the degenerate branches remains inconclusive at the analytical level, whereas heuristic arguments based on analysis of embedded eigenvalues of negative Krein signatures support the conjecture of their linear instability at least near the bifurcation point. Numerical results for the cubic NLS equation show that this conjecture is valid and that the degenerate branches become spectrally stable far away from the bifurcation point.
On the harmonic oscillator properties in a twisted Moyal plane
Ezinvi Baloitcha; Mahouton Norbert Hounkonnou; Dine Ousmane Samary
2012-03-25
This work prolongs, using an operator method, the investigations started in our recent paper J. Math. Phys. 51., 102108 on the spectrum and states of the harmonic oscillator on twisted Moyal plane, where rather a Moyal-star-algebraic approach was used. The physical spectrum and states of the harmonic oscillator on twisted Moyal space, obtained here by solving the corresponding differential equation, are similar to those of the ordinary Moyal space, with different parameters. This fortunately contrasts with the previous study which produced unexpected results, i.e. infinitely degenerate states with energies depending on the coordinate functions.
Harmonic oscillator in twisted Moyal plane: eigenvalue problem and relevant properties
Mahouton Norbert Hounkonnou; Dine Ousmane Samary
2010-08-07
The paper reports on a study of a harmonic oscillator (ho) in the twisted Moyal space, in a well defined matrix basis, generated by the vector fields $X_{a}=e_{a}^{\\mu}(x)\\partial_{\\mu}=(\\delta_{a}^{\\mu}+\\omega_{ab}^{\\mu}x^{b})\\partial_{\\mu}$, which induce a dynamical star product. The usual multiplication law can be hence reproduced in the $\\omega_{ab}^{\\mu}$ null limit. The star actions of creation and annihilation functions are explicitly computed. The ho states are infinitely degenerate with energies depending on the coordinate functions.
Jeans stability in collisional quantum dusty magnetoplasmas
Jamil, M.; Asif, M.; Mir, Zahid; Salimullah, M.
2014-09-15
Jeans instability is examined in detail in uniform dusty magnetoplasmas taking care of collisional and non-zero finite thermal effects in addition to the quantum characteristics arising through the Bohm potential and the Fermi degenerate pressure using the quantum hydrodynamic model of plasmas. It is found that the presence of the dust-lower-hybrid wave, collisional effects of plasma species, thermal effects of electrons, and the quantum mechanical effects of electrons have significance over the Jeans instability. Here, we have pointed out a new class of dissipative instability in quantum plasma regime.
Power enhancement of heat engines via correlated thermalization in multilevel systems
David Gelbwaser-Klimovsky; Wolfgang Niedenzu; Paul Brumer; Gershon Kurizki
2014-11-05
We analyze a heat machine based on a periodically-driven quantum system permanently coupled to hot and cold baths. It is shown that the maximal power output of a degenerate $V$-type three-level heat engine is that generated by two independent two-level systems. For $N$ levels, this maximal enhancement is $(N-1)$-fold. Hence, level degeneracy is a thermodynamic resource that may effectively boost the power output. The efficiency, however, is not affected. We find that coherence is not an essential asset in multilevel-based heat machines. The existence of multiple thermalization pathways sharing a common ground state suffices for power enhancement.
Baryon resonances coupled to Pion-Nucleon states in lattice QCD
Valentina Verduci; Christian B. Lang
2014-12-01
In recent years the study of two particle systems on the lattice has led to excellent results in the meson sector of the QCD spectrum, however baryon resonances mostly remain unexplored. We present a study of pion-nucleon systems as decay product of baryon resonances in different channels, with special focus on the nucleon spectrum. We evaluate the correlation functions of single and multi particle interpolators. All the Wick contributions are explicitly computed and the consequences of reduced symmetries in moving frames are taken into account. We discuss the theoretical setup together with results for $n_f=2$ mass degenerate light quarks.
Nucleon electromagnetic form factors from twisted mass lattice QCD
Abdou Abdel-Rehim; Constantia Alexandrou; Martha Constantinou; Kyriakos Hadjiyiannakou; Karl Jansen; Giannis Koutsou
2015-01-07
Results on the electromagnetic form factors of the nucleon using twisted mass fermion configurations are presented. These include a gauge field ensemble simulated with two degenerate light quarks yielding a pion mass of around 130 MeV, as well as two ensembles that include strange and charm quarks in the sea yielding pion masses of 210 MeV and 373 MeV. Details of the methods used and systematic errors are discussed, such as noise reduction techniques and the effect of excited states contamination.
Optical absorption in B{sub 13} cluster: A time-dependent density functional approach
Shinde, Ravindra; Tayade, Meenakshi
2013-02-05
The linear optical absorption spectra of three isomers of planar boron cluster B{sub 13} are calculated using time-dependent spin-polarized density functional approach. The geometries of these cluster are optimized at the B3LYP/6-311+G* level of theory. Even though the isomers are almost degenerate, the calculated spectra are quite different, indicating a strong structure-property relationship. Therefore, these computed spectra can be used in the photo-absorption experiments to distinguish between different isomers of a cluster.
An atomic magnetometer with autonomous frequency stabilization and large dynamic range
Pradhan, S. E-mail: pradhans75@gmail.com; Poornima,; Dasgupta, K.; Mishra, S.; Behera, R.
2015-06-15
The operation of a highly sensitive atomic magnetometer using elliptically polarized resonant light is demonstrated. It is based on measurement of zero magnetic field resonance in degenerate two level systems using polarimetric detection. The transmitted light through the polarimeter is used for laser frequency stabilization, whereas reflected light is used for magnetic field measurement. Thus, the experimental geometry allows autonomous frequency stabilization of the laser frequency leading to compact operation of the overall device and has a preliminary sensitivity of <10 pT/Hz{sup 1/2} @ 1 Hz. Additionally, the dynamic range of the device is improved by feedback controlling the bias magnetic field without compromising on its sensitivity.
Generalized matrix models and AGT correspondence at all genera
Giulio Bonelli; Kazunobu Maruyoshi; Alessandro Tanzini; Futoshi Yagi
2011-07-11
We study generalized matrix models corresponding to n-point Virasoro conformal blocks on Riemann surfaces with arbitrary genus g. Upon AGT correspondence, these describe four dimensional N=2 SU(2)^{n+3g-3} gauge theories with generalized quiver diagrams. We obtain the generalized matrix models from the perturbative evaluation of the Liouville correlation functions and verify the consistency of the description with respect to degenerations of the Riemann surface. Moreover, we derive the Seiberg-Witten curve for the N=2 gauge theory as the spectral curve of the generalized matrix model, thus providing a check of AGT correspondence at all genera.
A compact design for the Josephson mixer: the lumped element circuit
J. -D. Pillet; E. Flurin; F. Mallet; B. Huard
2015-06-08
We present a compact and efficient design in terms of gain, bandwidth and dynamical range for the Josephson mixer, the superconducting circuit performing three-wave mixing at microwave frequencies. In an all lumped-element based circuit with galvanically coupled ports, we demonstrate non degenerate amplification for microwave signals over a bandwidth up to 50 MHz for a power gain of 20 dB. The quantum efficiency of the mixer is shown to be about 70$\\%$ and its saturation power reaches $-112$ dBm.
On fusion kernel in Liouville theory
Nikita Nemkov
2014-09-29
We study fusion kernel for non-degenerate conformal blocks in Liouville theory as a solution to the difference equations originating from the pentagon identity. We suggest an approach to these equations based on 'non-perturbative' series expansion which allows to calculate the fusion kernel iteratively. We also find the exact solutions for the cases when the central charge is $c=1+6(b-b^{-1})^2$ and $b~\\in \\mathbb{N}$. For $c = 1$ our result reproduces the formula, obtained earlier from analytical continuation via Painlev\\'e equation. However, in our case it appears in a significantly simplified form.
Dyonic Wormholes in 5D Kaluza-Klein Theory
Chen, C M
2001-01-01
New spherically symmetric dyon solutions, describing wormhole-like class of spacetime configurations, in 5D Kaluza-Klein theory are given in an explicit form. For this type of solutions the electric and magnetic fields cause significantly different global structure. When the two parameters indicating the electric and magnetic charges are identical, the throat of wormhole ``degenerates'' and the solution reduces to the trivial embedding of 4D massless Reissner-Nordstr{\\"o}m black hole solution. Moreover, their counterparts in 11D supergravity are constructed by a non-trivial uplifting.
Ralph Blumenhagen; Thomas W. Grimm; Benjamin Jurke; Timo Weigand
2009-08-31
We study the F-theory uplift of Type IIB orientifold models on compact Calabi-Yau threefolds containing divisors which are del Pezzo surfaces. We consider two examples defined via del Pezzo transitions of the quintic. The first model has an orientifold projection leading to two disjoint O7-planes and the second involution acts via an exchange of two del Pezzo surfaces. The two uplifted fourfolds are generically singular with minimal gauge enhancements over a divisor and, respectively, a curve in the non-Fano base. We study possible further degenerations of the elliptic fiber leading to F-theory GUT models based on subgroups of E8.
Uplifted supersymmetric Higgs region
Bogdan A. Dobrescu; Patrick J. Fox
2010-05-26
We show that the parameter space of the Minimal Supersymmetric Standard Model includes a region where the down-type fermion masses are generated by the loop-induced couplings to the up-type Higgs doublet. In this region the down-type Higgs doublet does not acquire a vacuum expectation value at tree level, and has sizable couplings in the superpotential to the tau leptons and bottom quarks. Besides a light standard-like Higgs boson, the Higgs spectrum includes the nearly degenerate states of a heavy spin-0 doublet which can be produced through their couplings to the $b$ quark and decay predominantly into \\tau^+\\tau^- or \\tau\
Thermal Gravitational Waves from Primordial Black Holes
C. Sivaram; Kenath Arun
2010-05-19
Thermal gravitational waves can be generated in various sources such as, in the cores of stars, white dwarfs and neutron stars due to the fermion collisions in the dense degenerate Fermi gas. Such high frequency thermal gravitational waves can also be produced during the collisions in a gamma ray burst or during the final stages of the evaporation of primordial black holes. Here we estimate the thermal gravitational waves from primordial black holes and estimate the integrated energy of the gravitational wave emission over the entire volume of the universe and over Hubble time. We also estimate the gravitational wave flux from gamma ray bursts and jets.
Sterile neutrinos in the 3+s scenario and solar data
Pulido, Joao
2013-01-01
The flatness of the SuperKamiokande neutrino electron scattering spectrum and the apparent downturn of the charged current spectrum in the SNO data which the Large Mixing Angle solution (LMA) to the solar neutrino problem fails to predict are analysed in the context of an extension to the standard electroweak model with light sterile neutrinos. It is found that a sterile neutrino which is quasi degenerate with the active ones with $\\Delta m^2_{41}=10^{-5}eV^2$ and mixing $sin\\theta_{14}=0.04$ provides a suitable improvement to the LMA data fits.
Spectral statistics of nearly unidirectional quantum graphs
Maram Akila; Boris Gutkin
2015-08-19
The energy levels of a quantum graph with time reversal symmetry and unidirectional classical dynamics are doubly degenerate and obey the spectral statistics of the Gaussian Unitary Ensemble. These degeneracies, however, are lifted when the unidirectionality is broken in one of the graph's vertices by a singular perturbation. Based on a Random Matrix model we derive an analytic expression for the nearest neighbour distribution between energy levels of such systems. As we demonstrate the result agrees excellently with the actual statistics for graphs with a uniform distribution of eigenfunctions. Yet, it exhibits quite substantial deviations for classes of graphs which show strong scarring.
Burger, Florian [Humboldt U. Berlin; Feng, Xu [KEK; Hotzel, Grit [Humboldt U. Berlin; Jansen, Karl [DESY; Petschlies, Marcus [The Cyprus Institute; Renner, Dru B. [JLAB
2013-11-01
We present results for the leading order QCD correction to the anomalous magnetic moment of the muon including the first two generations of quarks as dynamical degrees of freedom. Several light quark masses are examined in order to yield a controlled extrapolation to the physical pion mass. We analyse ensembles for three different lattice spacings and several volumes in order to investigate lattice artefacts and finite-size effects, respectively. We also provide preliminary results for this quantity for two flavours of mass-degenerate quarks at the physical value of the pion mass.
Sudheesh, P.; Chandrasekharan, K. [Laser and Nonlinear Optics Laboratory, Department of Physics, National Institute of Technology Calicut (India); Rao, D. Mallikharjuna [Nano Display Laboratory, School of Nanoscience and Technology, National Institute of Technology Calicut (India)
2014-01-28
The third-order nonlinear optical properties of newly synthesized phenylhydrazone derivatives and the influence of noble metal nanoparticles (Ag and Au) on their nonlinear optical responses were investigated by employing Degenerate Four wave Mixing (DFWM) technique with a 7 nanosecond, 10Hz Nd: YAG laser pulses at 532nm. Metal nanoparticles were prepared by laser ablation and the particle formation was confirmed using UV-Visible spectroscopy, Transmission Electron Microscopy (TEM). The nonlinear optical susceptibility were measured and found to be of the order 10{sup ?13}esu. The results are encouraging and conclude that the materials are promising candidate for future optical device applications.
White dwarfs as physics laboratories: the case of axions
J. Isern; L. Althaus; S. Catalan; A. Corsico; E. Garcia-Berro; M. Salaris; S. Torres
2012-04-16
White dwarfs are almost completely degenerate objects that cannot obtain energy from thermonuclear sources, so their evolution is just a gravothermal cooling process. Recent improvements in the accuracy and precision of the luminosity function and in pulsational data of variable white dwarfs suggest that they are cooling faster than expected from conventional theory. In this contribution we show that the inclusion of an additional cooling term due to axions able to interact with electrons with a coupling constant g_ae ~(2-7)x10^{-13} allows to fit better the observations.
J. Isern; S. Catalan; E. Garcia-Berro; M. Salaris; S. Torres
2010-10-26
White dwarfs are almost completely degenerate objects that cannot obtain energy from the thermonuclear sources and their evolution is just a gravothermal process of cooling. The simplicity of these objects, the fact that the physical inputs necessary to understand them are well identified, although not always well understood, and the impressive observational background about white dwarfs make them the most well studied Galactic population. These characteristics allow to use them as laboratories to test new ideas of physics. In this contribution we discuss the robustness of the method and its application to the axion case.
A. S. Villar; M. Martinelli; C. Fabre; P. Nussenzveig
2006-10-09
We calculate the quantum correlations existing among the three output fields (pump, signal, and idler) of a triply resonant non-degenerate Optical Parametric Oscillator operating above threshold. By applying the standard criteria [P. van Loock and A. Furusawa, Phys. Rev. A 67, 052315 (2003)], we show that strong tripartite continuous-variable entanglement is present in this well-known and simple system. Furthermore, since the entanglement is generated directly from a nonlinear process, the three entangled fields can have very different frequencies, opening the way for multicolored quantum information networks.
Fermion Masses and Mixings from a Minimum Principle
Rodrigo Alonso
2014-05-22
We analyze the structure of quark and lepton mass matrices under the hypothesis that they are determined from a minimum principle applied to a generic potential invariant under the $\\left[U(3)\\right]^5\\otimes {\\mathcal O}(3)$ flavor symmetry, acting on Standard Model fermions and right-handed neutrinos. Unlike the quark case, we show that hierarchical masses for charged leptons are naturally accompanied by degenerate Majorana neutrinos with one mixing angle close to maximal, a second potentially large, a third one necessarily small, and one maximal relative Majorana phase. The scheme presented here could be tested in the near future via neutrino-less double beta decay and cosmological measurements.
Narendran, N. K. Siji, E-mail: sijinarendran@gmail.com; Chandrasekharan, K. [Laser and nonlinear optics laboratory, Department of Physics, National Institute of Technology Calicut, Calicut-673601, Kerala (India); Soman, Rahul; Arunkumar, Chellaiah [Bioinorganic materials laboratory, Department of Chemistry, National Institute of Technology Calicut, Calicut-673601, Kerala (India); Sudheesh, P. [Department of Physics, VTM NSS College, Dhanuvachapuram, Thiruvananthapuram (India)
2014-10-15
Porphyrins and metalloporphyrins are unique class of molecules for Nonlinear Optical applications because of their unique structure of altering the central metal atom, large extended ?-system, high thermal stability, tunable shape, symmetry and synthetic versatility Here, we report ?{sup (3)} Measurements of a simple phenyl porphyrins and its highvalent tin(IV) porphyrins with Bromination characterized by UV-Visible spectroscopic method. In this study, we employed the Degenerate Four Wave Mixing technique using forward Boxcar geometry with an Nd:YAG nano second pulsed laser as source and it was found that the tin(IV) porphyrin with Bromination exhibits good ?{sup (3)} value and figure of merit.
Chirped-pulse manipulated carrier dynamics in low-temperature molecular-beam-epitaxy grown GaAs
Lee, Chao-Kuei, E-mail: chuckcklee@yahoo.com [Department of Photonics, National Sun-Yat-Sen University, Kaohsiung 80400, Taiwan (China); Lin, Yuan-Yao [Department of Electrical Engineering, Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30010, Taiwan (China); Lin, Sung-Hui [Department of Photonics, National Chiao Tung University, Hsinchu 30010, Taiwan (China); Lin, Gong-Ru [Department of Electrical Engineering, Graduate Institute of Photonics and Optoelectronics, National Taiwan University, No. 1, Roosevelt Road, Sec. 4, Taipei 10617, Taiwan (China); Pan, Ci-Ling [Department of Photonics, National Chiao Tung University, Hsinchu 30010, Taiwan (China); Department of Physics, National Tsing Hwa University, Hsinchu 30010, Taiwan (China)
2014-04-28
Chirped pulse controlled carrier dynamics in low-temperature molecular-beam-epitaxy grown GaAs are investigated by degenerate pump-probe technique. Varying the chirped condition of excited pulse from negative to positive increases the carrier relaxation time so as to modify the dispersion and reshape current pulse in time domain. The spectral dependence of carrier dynamics is analytically derived and explained by Shockley-Read Hall model. This observation enables the new feasibility of controlling carrier dynamics in ultrafast optical devices via the chirped pulse excitations.
Power-efficient production of photon pairs in a tapered chalcogenide microwire
Meyer-Scott, Evan; Ahmad, Raja; Li, Lizhu; Rochette, Martin; Jennewein, Thomas
2015-01-01
Using tapered fibers of As2Se3 chalcogenide glass, we produce photon pairs at telecommunication wavelengths with pump power as low as 250 nW for a single pump, and 191 nW for the weak pump in a two-pump non-degenerate scheme. Our results show that the ultrahigh nonlinearity in these microwires could allow single-photon pumping to produce photon pairs, enabling the production of large entangled states, heralding of single photons after lossy transmission, and photonic quantum information processing with nonlinear optics.
Fabrication of optoelectronic microwave linear and ring resonators on a gallium arsenide substrate
Yeh, Chun-Liang
1993-01-01
the frequency ~, = urn' +amoco) have been observed. In the third part of the optical tests, the degenerate parametric amplification of an optical signal RF modulated at the first mode of the resonator with a microwave pumping LO at second mode... for the ring resonator. 77 46 Mixing Test Setup. 79 47 The sum signal IF, for the linear resonator with 10 prn coupling gap. The RF signal is at 4. 875 GHz and the I, O signal is at 4. 750 GHz, where the IF, signal (users = ans + uiqo) is detected at 9. 624...
X(5) Critical-Point Structure in a Finite System
A. Leviatan
2005-09-01
X(5) is a paradigm for the structure at the critical point of a particular first-order phase transition for which the intrinsic energy surface has two degenerate minima separated by a low barrier. For a finite system, we show that the dynamics at such a critical point can be described by an effective deformation determined by minimizing the energy surface after projection onto angular momentum zero, and combined with two-level mixing. Wave functions of a particular analytic form are used to derive estimates for energies and quadrupole rates at the critical point.
Landau quantization and mass-radius relation of magnetized White Dwarfs in general relativity
Mukhopadhyay, Somnath; Basu, D N
2015-01-01
Recently, several white dwarfs have been proposed with masses significantly above the Chandrasekhar limit, known as Super-Chandrasekhar White Dwarfs, to account for the overluminous Type Ia supernovae. In the present work, Equation of State of a completely degenerate relativistic electron gas in magnetic field based on Landau quantization of charged particles in a magnetic field is developed. The mass-radius relations for magnetized White Dwarfs are obtained by solving the Tolman-Oppenheimer-Volkoff equations. The effects of the magnetic energy density and pressure contributed by a density-dependent magnetic field are treated properly to find the stability configurations of realistic magnetic White Dwarf stars.
Thermal and Electric Conductivities of Coulomb Crystals in the Inner Crust of a Neutron Star
D. A. Baiko; D. G. Yakovlev
1996-04-28
Thermal and electric conductivities of relativistic degenerate electrons are calculated for the case when electrons scatter by phonons in Coulomb crystals made of spherical finite--size nuclei at densities $10^{11}$~g/cm$^3 neutron star. In combination with the results of the previous article (for lower $\\rho$), simple unified fits are obtained which describe the kinetic coefficients in the range $10^3$~g/cm$^3 neutron stars and evolution of their magnetic fields. The difference between the kinetic coefficients in the neutron star crust composed of ground state and accreted matters is analyzed. Thermal drift of the magnetic field in the neutron star crust is discussed.
Metamorphosis of an identified serotonergic neuron in the Drosophila olfactory system
Roy, Bidisha; Singh, Ajeet P; Shetty, Chetak; Chaudhary, Varun; North, Annemarie; Landgraf, Matthias; Vijay Raghavan, K; Rodrigues, Veronica
2007-10-24
polarity protein (Repo) revealed the presence of a large number of glial cells in the vicinity of CSDn (Figure 3e(i)). The numbers increase until 20 hours APF and line the degenerating arbors (Figure 3e(ii–iv)). Glial cells are not observed in this pattern... are indicated by dotted lines in control (no HU) preparations. (h, i) In HU treated animals where the mushroom bodies were absent (h), the architecture of the CSDn was normal (i). Secondary branches (yel- low and white asterisk) that arborize over the calyx...
Neutron - Mirror Neutron Oscillations: How Fast Might They Be?
Zurab Berezhiani; Luis Bento
2006-02-20
We discuss the phenomenological implications of the neutron (n) oscillation into the mirror neutron (n'), a hypothetical particle exactly degenerate in mass with the neutron but sterile to normal matter. We show that the present experimental data allow a maximal n-n' oscillation in vacuum with a characteristic time $\\tau$ much shorter than the neutron lifetime, in fact as small as 1 sec. This phenomenon may manifest in neutron disappearance and regeneration experiments perfectly accessible to present experimental capabilities and may also have interesting astrophysical consequences, in particular for the propagation of ultra high energy cosmic rays.
Russian doll spectrum in a non-Abelian string-net ladder
M. D. Schulz; S. Dusuel; J. Vidal
2015-04-09
We study a string-net ladder in the presence of a string tension. Focusing on the simplest non-Abelian anyon theory with a quantum dimension larger than two, we determine the phase diagram and find a Russian doll spectrum featuring size-independent energy levels as well as highly degenerate zero-energy eigenstates. At the self-dual points, we compute the gap exactly by using a mapping onto the Temperley-Lieb chain. These results are in stark constrast with the ones obtained for Fibonacci or Ising theories.
Faster Quantum Walk Search on a Weighted Graph
Thomas G. Wong
2015-07-27
A randomly walking quantum particle evolving by Schr\\"odinger's equation searches for a unique marked vertex on the "simplex of complete graphs" in time $\\Theta(N^{3/4})$. In this paper, we give a weighted version of this graph that preserves vertex-transitivity, and we show that the time to search on it can be reduced to nearly $\\Theta(\\sqrt{N})$. To prove this, we introduce two novel extensions to degenerate perturbation theory: an adjustment that distinguishes the weights of the edges, and a method to determine how precisely the jumping rate of the quantum walk must be chosen.
Hamilton-Jacobi Approach for First Order Actions and Theories with Higher Derivatives
M. C. Bertin; B. M. Pimentel; P. J. Pompeia
2007-01-29
In this work we analyze systems described by Lagrangians with higher order derivatives in the context of the Hamilton-Jacobi formalism for first order actions. Two different approaches are studied here: the first one is analogous to the description of theories with higher derivatives in the hamiltonian formalism according to [Sov. Phys. Journ. 26 (1983) 730; the second treats the case where degenerate coordinate are present, in an analogy to reference [Nucl. Phys. B 630 (2002) 509]. Several examples are analyzed where a comparison between both approaches is made.
Fusion rules and vortices in $p_x+ip_y$ superconductors
Michael Stone; Suk Bum Chung
2005-11-30
The "half-quantum" vortices ($\\sigma$) and quasiparticles ($\\psi$) in a two-dimensional $p_x+ip_y$ superconductor obey the Ising-like fusion rules $\\psi\\times \\psi=1$, $\\sigma\\times \\psi=\\sigma$, and $\\sigma\\times \\sigma= 1+\\psi$. We explain how the physical fusion of vortex-antivortex pairs allows us to use these rules to read out the information encoded in the topologically protected space of degenerate ground states. We comment on the potential applicability of this fact to quantum computation. Modified 11/30/05 to reflect manuscript as accepted for publication. Includes corrected last section.
A self-injected, diode-pumped, solid-state ring laser for laser cooling of Li atoms
Miake, Yudai; O'Hara, Kenneth M; Gensemer, Stephen
2015-01-01
We have constructed a solid-state light source for experiments with laser cooled lithium atoms based on a Nd:YVO$_4$ ring laser with second-harmonic generation. Unidirectional lasing, an improved mode selection, and a high output power of the ring laser was achieved by weak coupling to an external cavity which contained the lossy elements required for single frequency operation. Continuous frequency tuning is accomplished by controlling two PZTs in the internal and the external cavities simultaneously. The light source has been utilized to trap and cool fermionic lithium atoms into the quantum degenerate regime.
Superstring BRST no-ghost theorem at arbitrary picture number
Mykola Dedushenko
2015-11-12
A simple and self-contained treatment of the superstring BRST no-ghost theorem at non-zero momentum and arbitrary picture number is presented. We prove by applying the spectral sequence that the absolute BRST cohomology is isomorphic to two copies of the light-cone spectrum at adjacent ghost numbers. We single out a representative in each cohomology class. A non-degenerate pairing between the Fock spaces, an induced pairing on the cohomology and a Hermitian inner product on the cohomology are constructed.
Hessian structures, Euler vector fields, and thermodynamics
M. Á. García-Ariza
2015-06-15
In this paper, it is shown that the underlying geometric structure of thermodynamics is formed by two elements. The first one is a degenerate Hessian structure distinguished by the fact that its potentials are extensive functions. A suitable coordinate-free definition of the latter is presented, relying on a particular vector field which is proposed to be the second ingredient of the geometric structure of thermodynamics. This vector has the form of an Euler vector in certain coordinate charts that somehow generalize those formed by internal energy or entropy and deformation coordinates in the spaces of equilibrium states of thermodynamic systems. Intensive functions and Legendre transforms are reviewed under this approach.
Zhukovskii, K.V.; Eminov, P.A. [Moscow State Inst. for Electronics and Mathematics (Russian Federation)
1995-11-01
The one-loop approximation is used to calculate the effects of finite temperature and nonzero chemical potential on the electron energy shift in a (2 + 1)-quantum electrodynamic system containing a Churn-Simon term. The induced electron mass is derived with a massless (2 + 1)-quantum electrodynamic system together with the exchange correction to the thermodynamic potential for a completely degenerate electron gas. It is shown that in the last case, incorporating the Churn-Simon term leads to loss of the gap in the direction law.
Electromagnetically induced absorption in metastable 83Kr atoms
Kale, Y B; Mishra, S R; Singh, S; Rawat, H S
2015-01-01
We report electromagnetically induced absorption (EIA) resonances of sub-natural linewidth (FWHM) in metastable noble gas 83Kr* atoms using degenerate two level schemes (DTLSs). This is the first observation of EIA effect in a metastable noble gas atoms. Using these spectrally narrow EIA signals obtained corresponding to the closed hyperfine transition from 4p55s[3/2]2 to 4p55p[5/2]3 hyperfine manifolds of 83Kr* atoms, we have measured the Lande's g-factor (gF) for the lower level (F = 13/2) of the closed transition accurately with small applied magnetic fields of few Gauss.
Neutrinos and Big-Bang Nucleosynthesis
T. KAJINO; M. ORITO
1998-04-17
Observations of clusters and super clusters of galaxies have indicated that the Universe is more dominated by baryons than ever estimated in the homogeneous cosmological model for primordial nucleosynthesis. Recent detections of possibly low deuterium abundance in Lyman-$\\alpha$ clouds along the line of sight to high red-shift quasars have raised another potential difficulty that \\he4 is overproduced in any cosmological models which satisfy the low deuterium abundance constraint. We show that the inhomogeneous cosmological model with degenerate electron-neutrino can resolve these two difficulties.
Alternative large Nc baryons and holography
Carlos Hoyos-Badajoz; Andreas Karch
2009-06-24
In gauge theories in the limit of a large number Nc of colors, baryons are usually described as heavy solitonic objects with mass of order Nc. We discuss an alternative large Nc description both directly in the field theory as well as using holography. In this alternative large Nc limit at least some of the baryons behave like mesons, that is they stay light even at large Nc and their interactions vanish in that limit. For Nc=3 these alternative large Nc baryons are equivalent to the standard baryons. In the holographic description it is manifest that the Regge slopes of mesons and alternative baryons are degenerate.
Fontana, Peter R.; Srivastava, Rajendra P.
1973-06-01
at E = 0 is 2le I' Ib/(t)I = @~ R~R~~»nh'(IRlyt)e"'" (13)a ylal 0 5 '7 FIG. 3. Probabilities of photon emission as a function of time. The frequency corresponds to the energy differ- ence between the unperturbed degenerate excited states and the ground... states 6 is 0. 5 ey. For V= 0 the emission line is Lorentzian, but for V0 a "hole" appears at the frequency equal to the frequency difference between the excited nondecay- ing state and the ground state. The position of the "hole" is independent...
Determine Ramsey numbers on a quantum computer
Hefeng Wang
2015-10-07
We present a quantum algorithm for computing the Ramsey numbers whose computational complexity grows super-exponentially with the number of vertices of a graph on a classical computer. The problem is mapped to a decision problem on a quantum computer, a probe qubit is coupled to a register that represents the problem and detects the energy levels of the problem Hamiltonian. The decision problem is solved by determining whether the probe qubit exhibits resonance dynamics. The algorithm shows a quadratic speedup over its classical counterparts, and the degenerate ground state problem in the adiabatic quantum evolution algorithm for this problem is avoided.