Radiation Therapy for Neovascular Age-related Macular Degeneration
Kishan, Amar U. [Harvard Medical School, Boston, Massachusetts (United States)] [Harvard Medical School, Boston, Massachusetts (United States); Modjtahedi, Bobeck S.; Morse, Lawrence S. [Department of Ophthalmology and Vision Sciences, University of California, Davis, Sacramento, California (United States)] [Department of Ophthalmology and Vision Sciences, University of California, Davis, Sacramento, California (United States); Lee, Percy, E-mail: percylee@mednet.ucla.edu [Department of Radiation Oncology, David Geffen School of Medicine at UCLA, Los Angeles, California (United States)] [Department of Radiation Oncology, David Geffen School of Medicine at UCLA, Los Angeles, California (United States)
2013-03-01T23:59:59.000Z
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.
2013-01-01T23:59:59.000Z
are critical for energy production, the haplogroup-relatedbioenergetics and energy production levels causing a)the mitochondrial energy production efficiency [8]. Sperm
2013-01-01T23:59:59.000Z
may change the retinal bioenergetics and play a significantmay change retinal bioenergetics and energy production
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.
2015-01-01T23:59:59.000Z
pathway, including complement factor H (CFH),[3535,3636] complement factor B/complement 236 component 2 (CFB/C2),[3737] complement 3 (C3),[3838] and complement factor I (CFI)[3939] are 237 associated with increased risk of AMD. In the cross sectional...
Fafowora, Oluwatoyin Folasade
2015-01-01T23:59:59.000Z
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,
2013-01-01T23:59:59.000Z
DNA Variants Mediate Energy Production and Expression Levelsmediate not only energy production and cell growth, but alsoDNA Variants Mediate Energy Production and Expression Levels
Accident sequence precursor events with age-related contributors
Murphy, G.A.; Kohn, W.E.
1995-12-31T23:59:59.000Z
The Accident Sequence Precursor (ASP) Program at ORNL analyzed about 14.000 Licensee Event Reports (LERs) filed by US nuclear power plants 1987--1993. There were 193 events identified as precursors to potential severe core accident sequences. These are reported in G/CR-4674. Volumes 7 through 20. Under the NRC Nuclear Plant Aging Research program, the authors evaluated these events to determine the extent to which component aging played a role. Events were selected that involved age-related equipment degradation that initiated an event or contributed to an event sequence. For the 7-year period, ORNL identified 36 events that involved aging degradation as a contributor to an ASP event. Except for 1992, the percentage of age-related events within the total number of ASP events over the 7-year period ({approximately}19%) appears fairly consistent up to 1991. No correlation between plant ape and number of precursor events was found. A summary list of the age-related events is presented in the report.
Neurobiology of Aging xxx (2006) xxxxxx Age-related changes in brain activation during
2006-01-01T23:59:59.000Z
Neurobiology of Aging xxx (2006) xxxxxx Age-related changes in brain activation during a delayed. / Neurobiology of Aging xxx (2006) xxxxxx impairment in several different memory variables [78], including WM [9
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
Examining Age-Related Use of Visual Imagery Subprocesses in Children
Oliver, Brittney
2011-08-08T23:59:59.000Z
This study examined the age-related ability of children (7 to 11 years) and adults to use visual imagery in tasks requiring the subprocesses of imagery generation, maintenance and inspection. Previous work had shown that young children...
Organization and differentiation of stem cells on delivery scaffold for retinal tissue engineering
Ko, Chi Wan
2011-01-01T23:59:59.000Z
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 ...
Use Of Green Porphyrinsto Treat Neovasculature In The Eyes
Levy, Julia (Vancouver, CA); Miller, Joan W. (Boston, MA); Gradoudas, Evangelos S. (Boston, MA); Hasan, Tayyaba (Arlington, MA); Schmidt-Erfurth, Ursula (Luebeck, DE)
1998-08-25T23:59:59.000Z
Photodynamic therapy of conditions of the eye characterized by unwanted neovasculature, such as age-related macular degeneration, is effective using green porphyrins as photoactive agents, preferably as liposomal compositions.
Gehl, A.C.; Hagen, E.W. [Oak Ridge National Lab., TN (United States)
1992-07-01T23:59:59.000Z
A study of the aging-related operating experiences throughout a five-year period (1984--1988) of six generic instrumentation modules (indicators, sensors, controllers, transmitters, annunciators, and recorders) was performed as a part of the Nuclear Plant Aging Research Program. The effects of aging from operational and environmental stressors were characterized from results depicted in Licensee Event Reports (LERs). The data are graphically displayed as frequency of events per plant year for operating plant ages from 1 to 28 years to determine aging-related failure trend patterns. Three main conclusions were drawn from this study: (1) Instrumentation and control (I&C) modules make a modest contribution to safety-significant events: 17% of LERs issued during 1984--1988 dealt with malfunctions of the six I&C modules studied, and 28% of the LERs dealing with these I&C module malfunctions were aging related (other studies show a range 25--50%); (2) Of the six modules studied, indicators, sensors, and controllers account for the bulk (83%) of aging-related failures; and (3) Infant mortality appears to be the dominant aging-related failure mode for most I&C module categories (with the exception of annunciators and recorders, which appear to fail randomly).
Single Enrichment Variables Differentially Reduce Age-Related Memory Decline in Female Mice
Frick, Karyn M.
Single Enrichment Variables Differentially Reduce Age-Related Memory Decline in Female Mice Lauren to determine how different elements of enrichment, for example, cognitive stimu- lation and voluntary exercise), running wheels alone (exercise), or both toys and running wheels (complex enrichment) for 4 weeks prior
Ritchie, Robert
2005-01-01T23:59:59.000Z
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
Munoz, Douglas Perry
2011-01-01T23:59:59.000Z
Neurobiology of Aging 32 (2011) 669679 Age-related trends in saccade characteristics among of Psychology, Queen's University, Kingston, Ontario, Canada e CIHR Group in Sensory-Motor Systems, Queen in reaction time also correlated positively with age in both saccade tasks. Voluntary saccade control
Ochsner, Kevin
Age-Related Differences in Emotional Reactivity, Regulation, and Rejection Sensitivity Massachusetts Institute of Technology James J. Gross Stanford University Katherine A. Remy and Kevin N. Ochsner reactivity or emotion regulation. Study 1 addressed this question by presenting healthy individuals aged 10
Age-Related Changes in the Spontaneous Motor Rhythms of the
Liu, Taosheng
, Department of Psychology, Bowling Green State University, Bowling Green, Ohio, USA The present study examined with age-related changes in human subjects and suggest that spontaneous wheel-running behavior in rodents@bgnet.bgsu.edu Experimental Aging Research, 30:113127, 2004 Copyright # Taylor & Francis Inc. ISSN: 0361-073X print/1096
macular pigment optical density. Methods. The instrument is small, uses light emitting diodes as light
Chronic stress and age-related increases in the proinflammatory cytokine interleukin-6
Kiecolt-Glaser, J. K.; Preacher, K. J.; MacCallum, R. C.; Atkinson, Cathie; Malarkey, W. B.; Glaser, R.
2003-01-01T23:59:59.000Z
Chronic stress and age-related increases in the proinflammatory cytokine IL-6 Janice K. Kiecolt-Glaser* ?? , Kristopher J. Preacher ? , Robert C. MacCallum ? , Cathie Atkinson*, William B. Malarkey ?H20648 , and Ronald Glaser ?? ** ?? Departments... of *Psychiatry, H20648 Internal Medicine, and **Molecular Virology, Immunology, and Medical Genetics, Ohio State University College of Medicine, Columbus, OH 43210; ? Department of Psychology, ? Institute for Behavioral Medicine Research, and ? Comprehensive...
Hu, P.S. [Oak Ridge National Lab., TN (United States)] [Oak Ridge National Lab., TN (United States); Young, J.R. [Tennessee Univ., Knoxville, TN (United States)] [Tennessee Univ., Knoxville, TN (United States); Lu, An [Oak Ridge Associated Universities, Inc., TN (United States)] [Oak Ridge Associated Universities, Inc., TN (United States)
1993-08-01T23:59:59.000Z
American society is undergoing a major demographic transformation that is resulting in a larger proportion of older individuals in the population. Moreover, recent travel surveys show that an increasing number of older individuals are licensed to drive and that they drive more than their same age cohort a decade ago. However, they continue to take shorter trips than younger drivers and they avoid driving during congested hours. This recent demographic transformation in our society, the graying of America, coupled with the increasing mobility of the older population impose a serious highway safety issue that cannot be overlooked. Some of the major concerns are the identification of ``high-risk`` older drivers and the establishment of licensing guidelines and procedures that are based on conclusive scientific evidence. Oak Ridge National Laboratory`s (ORNL) objectives in this project can be characterized by the following tasks: Review and evaluate the 1980 American Association of Motor Vehicle Administrators (AAMVA) and National Highway Traffic Safety Administration (NHTSA) licensing guidelines. Determine whether the license restriction recommended in the 1980 AAMVA and NHTSA guidelines was based on scientific evidence or on judgement of medical advisors. Identify in the scientific literature any medical conditions which are found to be highly associated with highway crashes, and which are not mentioned in the 1980 guidelines. Summarize States` current licensing practices for drivers with age-related physical and mental limitations. Identify potential data sources to establish conclusive evidence on age-related functional impairments and highway crashes.
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.
2012-01-01T23:59:59.000Z
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?cGy137Cs) 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 evident at longer timesmore »in controls (4 months).Ex vivobone 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
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
A Monte Carlo algorithm for degenerate plasmas
Turrell, A.E., E-mail: a.turrell09@imperial.ac.uk; Sherlock, M.; Rose, S.J.
2013-09-15T23:59:59.000Z
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.
2011-08-10T23:59:59.000Z
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.
Shear viscosity of degenerate electron matter
P. S. Shternin
2008-03-27T23:59:59.000Z
We calculate the partial electron shear viscosity $\\eta_{ee}$ limited by electron-electron collisions in a strongly degenerate electron gas taking into account the Landau damping of transverse plasmons. The Landau damping strongly suppresses $\\eta_{ee}$ in the domain of ultrarelativistic degenerate electrons and modifies its %asymptotic temperature behavior. The efficiency of the electron shear viscosity in the cores of white dwarfs and envelopes of neutron stars is analyzed.
Balatsoukas, Ioannis; Kourkoumelis, Nikolaos; Tzaphlidou, Margaret [Department of Medical Physics, Medical School, University of Ioannina, Ioannina 45110 (Greece)
2010-10-15T23:59:59.000Z
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.
Ion acoustic shock waves in degenerate plasmas
Akhtar, N. [Theoretical Plasma Physics Division, PINSTECH, Nilore, Islamabad 44000 Pakistan (Pakistan); Hussain, S. [Theoretical Plasma Physics Division, PINSTECH, Nilore, Islamabad 44000 Pakistan (Pakistan); Department of Physics and Applied Mathematics, PIEAS, Nilore, Islamabad 44000 Pakistan (Pakistan)
2011-07-15T23:59:59.000Z
Korteweg de Vries Burgers equation for negative ion degenerate dissipative plasma has been derived using reductive perturbation technique. The quantum hydrodynamic model is used to study the quantum ion acoustic shock waves. The effects of different parameters on quantum ion acoustic shock waves are studied. It is found that quantum parameter, electrons Fermi temperature, temperature of positive and negative ions, mass ratio of positive to negative ions, viscosity, and density ratio have significant impact on the shock wave structure in negative ion degenerate plasma.
Nie,J.; Braverman, J.; Hofmayer, C.; Kim, M. K.; Choi, I-K.
2009-04-27T23:59:59.000Z
When performing seismic safety assessments of nuclear power plants (NPPs), the potential effects of age-related degradation on structures, systems, and components (SSCs) should be considered. To address the issue of aging degradation, the Korea Atomic Energy Research Institute (KAERI) has embarked on a five-year research project to develop a realistic seismic risk evaluation system which will include the consideration of aging of structures and components in NPPs. Three specific areas that are included in the KAERI research project, related to seismic probabilistic risk assessment (PRA), are probabilistic seismic hazard analysis, seismic fragility analysis including the effects of aging, and a plant seismic risk analysis. To support the development of seismic capability evaluation technology for degraded structures and components, KAERI entered into a collaboration agreement with Brookhaven National Laboratory (BNL) in 2007. The collaborative research effort is intended to continue over a five year period with the goal of developing seismic fragility analysis methods that consider the potential effects of age-related degradation of SSCs, and using these results as input to seismic PRAs. In the Year 1 scope of work BNL collected and reviewed degradation occurrences in US NPPs and identified important aging characteristics needed for the seismic capability evaluations that will be performed in the subsequent evaluations in the years that follow. This information is presented in the Annual Report for the Year 1 Task, identified as BNL Report-81741-2008 and also designated as KAERI/RR-2931/2008. The report presents results of the statistical and trending analysis of this data and compares the results to prior aging studies. In addition, the report provides a description of U.S. current regulatory requirements, regulatory guidance documents, generic communications, industry standards and guidance, and past research related to aging degradation of SSCs. This report describes the research effort performed by BNL for the Year 2 scope of work. This research focused on methods that could be used to represent the long-term behavior of materials used at NPPs. To achieve this BNL reviewed time-dependent models which can approximate the degradation effects of the key materials used in the construction of structures and passive components determined to be of interest in the Year 1 effort. The intent was to review the degradation models that would cover the most common time-dependent changes in material properties for concrete and steel components.
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
Effect of trapping in degenerate quantum plasmas
Shah, H. A.; Qureshi, M. N. S. [Department of Physics, GC University, Lahore 54000 (Pakistan); Tsintsadze, N. [Department of Physics, GC University, Lahore 54000 (Pakistan); Salam Chair, GC University, Lahore 54000 (Pakistan)
2010-03-15T23:59:59.000Z
In the present work we consider the effect of trapping as a microscopic process in a plasma consisting of quantum electrons and nondegenerate ions. The formation of solitary structures is investigated in two cases: first when the electrons are fully degenerate and second when small temperature effects are taken into account. It is seen that not only rarefactive but coupled rarefactive and compressive solitons are obtained under different temperature conditions.
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
1999-04-13T23:59:59.000Z
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.
Relativistic Bernstein waves in a degenerate plasma
Ali, Muddasir; Hussain, Azhar [Department of Physics, G.C. University, Lahore 54000 (Pakistan); Salam Chair in Physics, G.C. University, Lahore 54000 (Pakistan); Murtaza, G. [Salam Chair in Physics, G.C. University, Lahore 54000 (Pakistan)
2011-09-15T23:59:59.000Z
Bernstein mode for a relativistic degenerate electron plasma is investigated. Using relativistic Vlasov-Maxwell equations, a general expression for the conductivity tensor is derived and then employing Fermi-Dirac distribution function a generalized dispersion relation for the Bernstein mode is obtained. Two limiting cases, i.e., non-relativistic and ultra-relativistic are discussed. The dispersion relations obtained are also graphically presented for some specific values of the parameters depicting how the propagation characteristics of Bernstein waves as well as the Upper Hybrid oscillations are modified with the increase in plasma number density.
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)
2004-04-01T23:59:59.000Z
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.
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
VISCOSITY SOLUTIONS TO DEGENERATE COMPLEX MONGE-AMP`ERE EQUATIONS
Boyer, Edmond
VISCOSITY SOLUTIONS TO DEGENERATE COMPLEX MONGE-AMP`ERE EQUATIONS PHILIPPE EYSSIDIEUX, VINCENT an alternative approach based on the concept of viscosity solutions and compare systematically viscosity concepts PDE approach to second-order degenerate elliptic equations is the method of viscosity solutions
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
Polarization degenerate solid-state cavity QED
Morten P. Bakker; Ajit V. Barve; Thomas Ruytenberg; Wolfgang Loffler; Larry A. Coldren; Dirk Bouwmeester; Martin P. van Exter
2015-03-27T23:59:59.000Z
A polarization degenerate microcavity containing charge-controlled quantum dots (QDs) enables equal coupling of all polarization degrees of freedom of light to the cavity QED system, which we explore through resonant laser spectroscopy. We first measure interference of the two fine-split neutral QD transitions and find very good agreement of this V-type three-level system with a coherent polarization dependent cavity QED model. We also study a charged QD that suffers from decoherence, and find also in this case that availability of the full polarization degrees of freedom is crucial to reveal the dynamics of the QD transitions. Our results pave the way for postselection-free quantum devices based on electron spin-photon polarization entanglement.
Anomalous skin effects in a weakly magnetized degenerate electron plasma
Abbas, G., E-mail: gohar.abbas@gcu.edu.pk; Sarfraz, M. [Department of Physics, GC University Lahore, Katchery Road, Lahore 54000 (Pakistan); Shah, H. A. [Forman Christian College University, Farozpur Road, Lahore 54600 (Pakistan)
2014-09-15T23:59:59.000Z
Fully relativistic analysis of anomalous skin effects for parallel propagating waves in a weakly magnetized degenerate electron plasma is presented and a graphical comparison is made with the results obtained using relativistic Maxwellian distribution function [G. Abbas, M. F. Bashir, and G. Murtaza, Phys. Plasmas 18, 102115 (2011)]. It is found that the penetration depth for R- and L-waves for degenerate case is qualitatively small in comparison with the Maxwellian plasma case. The quantitative reduction due to weak magnetic field in the skin depth in R-wave for degenerate plasma is large as compared to the non-degenerate one. By ignoring the ambient magnetic field, previous results for degenerate field free case are salvaged [A. F. Alexandrov, A. S. Bogdankevich, and A. A. Rukhadze, Principles of Plasma Electrodynamics (Springer-Verlag, Berlin/Heidelberg, 1984), p. 90].
Single-Degenerate Type Ia Supernovae Are Preferentially Overluminous
Fisher, Robert
2015-01-01T23:59:59.000Z
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...
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
Quantum weak chaos in a degenerate system
V. Ya. Demikhovskii; D. I. Kamenev; G. A. Luna-Acosta
1998-09-27T23:59:59.000Z
Quantum weak chaos is studied in a perturbed degenerate system --- a charged particle interacting with a monochromatic wave in a transverse magnetic field. The evolution operator for an arbitrary number of periods of the external field is built and its structure is explored in terms of the QE (quasienergy eigenstates) under resonance condition (wave frequency $=$ cyclotron frequency) in the regime of weak classical chaos. The new phenomenon of diffusion via the quantum separatrices and the influence of chaos on diffusion are investigated and, in the quasi classical limit, compared with its classical dynamics. We determine the crossover from purely quantum diffusion to a diffusion which is the quantum manifestation of classical diffusion along the stochastic web. This crossover results from the non-monotonic dependence of the characteristic localization length of the QE states on the wave amplitude. The width of the quantum separatrices was computed and compared with the width of the classical stochastic web. We give the physical parameters which can be realized experimentally to show the manifestation of quantum chaos in nonlinear acoustic resonance.
A FINITE DIFFERENCE APPROACH TO DEGENERATE BERNOULLI AND STIRLING POLYNOMIALS
Adelberg, Arnold
A FINITE DIFFERENCE APPROACH TO DEGENERATE BERNOULLI AND STIRLING POLYNOMIALS Arnold Adelberg, 1992 1 #12; RUNNING HEAD: Degen Bernoulli/Stirling Pols Professor Arnold Adelberg Department parameters), which includes Bernoulli and Stirling polynomials and various generalizations, is developed
Electromagnetic Solitons in Degenerate Relativistic Electron-Positron Plasma
Berezhiani, V I; Tsintsadze, N L
2014-01-01T23:59:59.000Z
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.
Blood Flow Magnetic Resonance Imaging of Retinal Degeneration
Duong, Timothy Q.
Blood Flow Magnetic Resonance Imaging of Retinal Degeneration Yingxia Li,1 Haiying Cheng,1 Qiang. Duong1,2,3,4,5,6,7 PURPOSE. This study aims to investigate quantitative basal blood flow as well as hypercapnia- and hyperoxia-induced blood flow changes in the retinas of the Royal College of Surgeons (RCS
Exact null controllability of degenerate evolution equations with scalar control
Fedorov, Vladimir E; Shklyar, Benzion
2012-12-31T23:59:59.000Z
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.
Degenerate band edges in optical fiber with multiple
the forward energy fluxes S of the two media defines the coupling efficiency ¼ S2=S1. For PBG materialsDegenerate band edges in optical fiber with multiple grating: efficient coupling to slow light), School of Physics, University of Sydney, Sydney, New South Wales 2006, Australia 2 CUDOS, School
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
Automatic Diabetic Macular Edema Detection in Fundus Images Using Publicly Available Datasets
Giancardo, Luca [ORNL; Meriaudeau, Fabrice [ORNL; Karnowski, Thomas Paul [ORNL; Li, Yaquin [University of Tennessee, Knoxville (UTK); Garg, Seema [University of North Carolina; Tobin Jr, Kenneth William [ORNL; Chaum, Edward [University of Tennessee, Knoxville (UTK)
2011-01-01T23:59:59.000Z
Diabetic macular edema (DME) is a common vision threatening complication of diabetic retinopathy. In a large scale screening environment DME can be assessed by detecting exudates (a type of bright lesions) in fundus images. In this work, we introduce a new methodology for diagnosis of DME using a novel set of features based on colour, wavelet decomposition and automatic lesion segmentation. These features are employed to train a classifier able to automatically diagnose DME. We present a new publicly available dataset with ground-truth data containing 169 patients from various ethnic groups and levels of DME. This and other two publicly available datasets are employed to evaluate our algorithm. We are able to achieve diagnosis performance comparable to retina experts on the MESSIDOR (an independently labelled dataset with 1200 images) with cross-dataset testing. Our algorithm is robust to segmentation uncertainties, does not need ground truth at lesion level, and is very fast, generating a diagnosis on an average of 4.4 seconds per image on an 2.6 GHz platform with an unoptimised Matlab implementation.
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
Electron thermal conductivity owing to collisions between degenerate electrons
P. S. Shternin; D. G. Yakovlev
2006-08-17T23:59:59.000Z
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 scattering and becomes competitive with the the electron conductivity due to scattering of electrons by impurity ions.
Quasi-Degenerate Neutrino Masses with Normal and Inverted Hierarchy
Francis, Ng K
2012-01-01T23:59:59.000Z
The effects of CP-phases on the three absolute quasi-degenerate Majorana neutrino (QDN) masses are stud-ied with neutrino mass matrices obeying {\\mu} - {\\tau} symmetry for normal as well as inverted hierarchical mass patterns. We have made further investigations on 1) the prediction of solar mixing angle which lies below tri-bimaximal mixing value in consistent with neutrino oscillation observational data, 2) the prediction on absolute neutrino mass parameter (mee) in 0{\
Electrostatic rogue-waves in relativistically degenerate plasmas
Akbari-Moghanjoughi, M. [Department of Physics, Faculty of Sciences, Azarbaijan Shahid Madani University, 51745-406 Tabriz, Iran and International Centre for Advanced Studies in Physical Sciences and Institute for Theoretical Physics, Ruhr University Bochum, D-44780 Bochum (Germany)
2014-10-15T23:59:59.000Z
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.
Jolesz, F.A.; Polak, J.F.; Ruenzel, P.W.; Adams, D.F.
1984-07-01T23:59:59.000Z
Wallerian degeneration of rat sciatic nerves was induced by nerve section. Fifteen days later the degenerated nerves were compared with the intact contralteral nerves from the same animal. Histological sections showed the changes typical of wallerian degeneration: axonal degeneration and secondary demyelination. The freshly dissected nerves were analyzed by magnetic resonance (MR) spectroscopy at 10 MHz, and the water content was determined by dehydration. In the degenerated nerves there was a marked prolongation of both T1 and T2 relaxation times, accompanied by an increase of water content. These results suggest that it should be possible to detect wallerian degeneration in MR images; this will have an important impact on neuropathological diagnosis of central and peripheral nervous system lesions.
Imploding and exploding shocks in negative ion degenerate plasmas
Hussain, S.; Akhtar, N. [Theoretical Plasma Physics Division, PINSTECH, Nilore, Islamabad 44000 (Pakistan); Department of Physics and Applied Mathematics PIEAS, Nilore, Islamabad 44000 (Pakistan)
2011-08-15T23:59:59.000Z
Imploding and exploding shocks are studied in nonplanar geometries for negative ion degenerate plasma. Deformed Korteweg de Vries Burgers (DKdVB) equation is derived by using reductive perturbation method. Two level finite difference scheme is used for numerical analysis of DKdVB. It is observed that compressive and rarefactive shocks are observed depending on the value of quantum parameter. The effects of temperature, kinematic viscosity, mass ratio of negative to positive ions and quantum parameter on diverging and converging shocks are presented.
Role of degeneration processes in picosecond nonlinear spectroscopy of HTSCs
Bobyrev, Yu V; Petnikova, V M; Rudenko, K V; Shuvalov, Vladimir V [International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)
2005-11-30T23:59:59.000Z
It is shown that both spectral-temporal and temperature anomalies of the reflectance and transmittance kinetics of high-temperature superconducting films at high 'impact' excitation levels have a direct analogue in the case when much longer and coincident in time picosecond pulses are used to excite and probe the film state. In this case, due to degeneration, the nontrivial (with a sharp jump in the vicinity of the phase transition point) dependence of the nonlinear response amplitude of a sample on its initial temperature should be observed. (nonlinear optical phenomena)
Ata-ur-Rahman,; Qamar, A. [Institute of Physics and Electronics, University of Peshawar, Peshawar 25000 (Pakistan) [Institute of Physics and Electronics, University of Peshawar, Peshawar 25000 (Pakistan); National Centre for Physics, QAU Campus, Shahdrah Valley Road, Islamabad 44000 (Pakistan); Masood, W. [National Centre for Physics, QAU Campus, Shahdrah Valley Road, Islamabad 44000 (Pakistan) [National Centre for Physics, QAU Campus, Shahdrah Valley Road, Islamabad 44000 (Pakistan); COMSATS, Institute of Information Technology, Park Road, Chak Shahzad, Islamabad 44000 (Pakistan); Eliasson, B. [Physics Department, University of Strathclyde, Glasgow G4 0NG, Scotland (United Kingdom)] [Physics Department, University of Strathclyde, Glasgow G4 0NG, Scotland (United Kingdom)
2013-09-15T23:59:59.000Z
In this paper, small but finite amplitude electrostatic solitary waves in a relativistic degenerate magnetoplasma, consisting of relativistically degenerate electrons and non-degenerate cold ions, are investigated. The Zakharov-Kuznetsov equation is derived employing the reductive perturbation technique and its solitary wave solution is analyzed. It is shown that only compressive electrostatic solitary structures can propagate in such a degenerate plasma system. The effects of plasma number density, ion cyclotron frequency, and direction cosines on the profiles of ion acoustic solitary waves are investigated and discussed at length. The relevance of the present investigation vis-a-vis pulsating white dwarfs is also pointed out.
Perpendicular propagating modes for weakly magnetized relativistic degenerate plasma
Abbas, Gohar; Bashir, M. F. [Salam Chair in Physics, G. C. University Lahore, Punjab 54000 (Pakistan); Department of Physics, G. C. University Lahore, Punjab 54000 (Pakistan); Murtaza, G. [Salam Chair in Physics, G. C. University Lahore, Punjab 54000 (Pakistan)
2012-07-15T23:59:59.000Z
Using the Vlasov-Maxwell system of equations, the dispersion relations for the perpendicular propagating modes (i.e., X-mode, O-mode, and upper hybrid mode) are derived for a weakly magnetized relativistic degenerate electron plasma. By using the density (n{sub 0}=p{sub F}{sup 3}/3{pi}{sup 2} Planck-Constant-Over-Two-Pi {sup 3}) and the magnetic field values for different relativistic degenerate environments, the propagation characteristics (i.e., cutoff points, resonances, dispersions, and band widths in k-space) of these modes are examined. It is observed that the relativistic effects suppress the effect of ambient magnetic field and therefore the cutoff and resonance points shift towards the lower frequency regime resulting in enhancement of the propagation domain. The dispersion relations of these modes for the non-relativistic limit (p{sub F}{sup 2} Much-Less-Than m{sub 0}{sup 2}c{sup 2}) and the ultra-relativistic limit (p{sub F}{sup 2} Much-Greater-Than m{sub 0}{sup 2}c{sup 2}) are also presented.
Dwarf spheroidal galaxies as degenerate gas of free fermions
Domcke, Valerie; Urbano, Alfredo, E-mail: valerie.domcke@sissa.it, E-mail: alfredo.urbano@sissa.it [SISSA - International School for Advanced Studies, via Bonomea 256, Trieste, 34136 Italy (Italy)
2015-01-01T23:59:59.000Z
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.
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
Monte Carlo simulation of electron transport in degenerate and inhomogeneous semiconductors
Monte Carlo simulation of electron transport in degenerate and inhomogeneous semiconductors Mona concentrations up to 1020 cm-3 . De- generate semiconductors are important for thermoelectric and thermionic transport in degenerate semiconductor-based structures. If the electron wavelength is smaller than
A Distributed Simplex Algorithm for Degenerate Linear Programs and Multi-Agent Assignments
Bullo, Francesco
A Distributed Simplex Algorithm for Degenerate Linear Programs and Multi-Agent Assignments Mathias: Distributed Simplex, Distributed Linear Programming, Asynchronous Algorithm, Multi-Agent Task Assignment. M we propose a novel distributed algorithm to solve degenerate linear programs on asynchronous peer
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
Phase conjugation by degenerate forward four-wave mixing
Khyzniak, A.; Kondilenko, V.; Kucherov, Iu.; Lesnik, S.; Odoulov, S.; Soskin, M.
1984-02-01T23:59:59.000Z
Phase conjugation (PC) that is due to degenerate forward four-wave mixing is studied both theoretically and experimentally. Similarity to backward four-wave mixing, the limiting efficiency of this process corresponds to the total energy transfer from each pump wave into the signal and conjugate waves, although in this case the Yariv oscillations do not occur. The numerical solution of the nonstationary problem is presented, revealing the transient oscillations of the PC-beam intensity with maxima many times exceeding the saturation value. PC of Q-switched and free-oscillating solid-state laser radiation is obtained by using the thermal nonlinearity of absorbing solutions. PC of CW laser radiation is obtained in a LiNbO3 crystal, the PC-beam intensity being six times larger than the initial intensity of the signal beam. The self-compensation of nonlinear phase distortions of the recording medium is demonstrated. 33 references.
Magnetohydrodynamic spin waves in degenerate electron-positron-ion plasmas
Mushtaq, A. [TPPD, PINSTECH Nilore, 44000 Islamabad (Pakistan); National Center for Physics, Shahdrah Valley Road, 44000 Islamabad (Pakistan); Maroof, R.; Ahmad, Zulfiaqr [Institute of Physics and Electronics, University of Peshawar, 25000 Peshawar (Pakistan); Qamar, A. [National Center for Physics, Shahdrah Valley Road, 44000 Islamabad (Pakistan); Institute of Physics and Electronics, University of Peshawar, 25000 Peshawar (Pakistan)
2012-05-15T23:59:59.000Z
Low frequency magnetosonic waves are studied in magnetized degenerate electron-positron-ion plasmas with spin effects. Using the fluid equations of magnetoplasma with quantum corrections due to the Bohm potential, temperature degeneracy, and spin magnetization energy, a generalized dispersion relation for oblique magnetosonic waves is derived. Spin effects are incorporated via spin force and macroscopic spin magnetization current. For three different values of angle {theta}, the generalized dispersion relation is reduced to three different relations under the low frequency magnetohydrodynamic assumptions. It is found that the effect of quantum corrections in the presence of positron concentration significantly modifies the dispersive properties of these modes. The importance of the work relevant to compact astrophysical bodies is pointed out.
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
2015-01-01T23:59:59.000Z
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.
Frozen light in photonic crystals with degenerate band edge
A. Figotin; I. Vitebskiy
2006-10-09T23:59:59.000Z
Consider a plane monochromatic wave incident on a semi-infinite periodic structure. What happens if the normal component of the transmitted wave group velocity vanishes? At first sight, zero normal component of the transmitted wave group velocity simply implies total reflection of the incident wave. But we demonstrate that total reflection is not the only possible outcome. Instead, the transmitted wave can appear in the form of a frozen mode with very large diverging amplitude and either zero, or purely tangential energy flux. The field amplitude in the transmitted wave can exceed that of the incident wave by several orders of magnitude. There are two qualitatively different kinds of frozen mode regime. The first one is associated with a stationary inflection point of electromagnetic dispersion relation. This phenomenon has been analyzed in our previous publications. Now, our focus is on the frozen mode regime related to a degenerate photonic band edge. An advantage of this new phenomenon is that it can occur in much simpler periodic structures. This spectacular effect is extremely sensitive to the frequency and direction of propagation of the incident plane wave. These features can be very attractive in a variety practical applications, such as higher harmonic generation and wave mixing, light amplification and lasing, highly efficient superprizms, etc.
Effect of trapping in a degenerate plasma in the presence of a quantizing magnetic field
Shah, H. A.; Iqbal, M. J.; Qureshi, M. N. S. [Department of Physics, GC University, Lahore 54000 (Pakistan); Tsintsadze, N. [Department of Physics, GC University, Lahore 54000 (Pakistan); Institute of Physics, Tbilisi 0177 (Georgia); Masood, W. [Theoretical Physics Division, PINSTECH, P.O. Nilore, Islamabad (Pakistan)
2012-09-15T23:59:59.000Z
Effect of trapping as a microscopic phenomenon in a degenerate plasma is investigated in the presence of a quantizing magnetic field. The plasma comprises degenerate electrons and non-degenerate ions. The presence of the quantizing magnetic field is discussed briefly and the effect of trapping is investigated by using the Fermi-Dirac distribution function. The linear dispersion relation for ion acoustic wave is derived in the presence of the quantizing magnetic field and its influence on the propagation characteristics of the linear ion acoustic wave is discussed. Subsequently, fully nonlinear equations for ion acoustic waves are used to obtain the Sagdeev potential and the investigation of solitary structures. The formation of solitary structures is studied both for fully and partially degenerate plasmas in the presence of a quantizing magnetic field. Both compressive and rarefactive solitons are obtained for different conditions of temperature and magnetic field.
Temperature jump in degenerate quantum gases in the presence of a Bose - Einstein condensate
A. V. Latyshev; A. A. Yushkanov
2010-01-04T23:59:59.000Z
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
2013-08-16T23:59:59.000Z
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.
Han, Bing; Chen, Xue-wen; Talebizadeh, Zohreh; Xu, Hua
2012-12-17T23:59:59.000Z
(Suppl 3):S14 http://www.biomedcentral.com/1752-0509/6/S3/S14 © 2012 Han et al.; licensee BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2...) heuristic search method can solve the classical XOR (Exclusive or) pro- blem [14]. We apply the EpiBN method to simulated datasets based on four disease models and three real datasets: Age-related Macular Degeneration (AMD) dataset, late-onset Alzheimer...
Hamilton-Jacobi Theory for Degenerate Lagrangian Systems with Holonomic and Nonholonomic Constraints
Melvin Leok; Tomoki Ohsawa; Diana Sosa
2012-09-12T23:59:59.000Z
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.
Cosmological constant in SUGRA models with Planck scale SUSY breaking and degenerate vacua
C. D. Froggatt; R. Nevzorov; H. B. Nielsen; A. W. Thomas
2014-10-08T23:59:59.000Z
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.
Nearly degenerate heavy sterile neutrinos in cascade decay: mixing and oscillations
Boyanovsky, Daniel
2014-01-01T23:59:59.000Z
Some extensions beyond the Standard Model propose the existence of nearly degenerate heavy sterile neutrinos. If kinematically allowed these can be resonantly produced and decay in a cascade to common final states. The common decay channels lead to mixing of the heavy sterile neutrino states and interference effects. We implement non-perturbative methods to study the dynamics of the cascade decay to common final states, which features similarities but also noteworthy differences with the case of neutral meson mixing. We show that mixing and oscillations among the nearly degenerate sterile neutrinos can be detected as \\emph{quantum beats} in the distribution of final states produced from their decay. These oscillations would be a telltale signal of mixing between heavy sterile neutrinos. We study in detail the case of two nearly degenerate sterile neutrinos produced in the decay of pseudoscalar mesons and decaying into a purely leptonic "visible" channel: $\
Nearly degenerate heavy sterile neutrinos in cascade decay: mixing and oscillations
Daniel Boyanovsky
2014-11-20T23:59:59.000Z
Some extensions beyond the Standard Model propose the existence of nearly degenerate heavy sterile neutrinos. If kinematically allowed these can be resonantly produced and decay in a cascade to common final states. The common decay channels lead to mixing of the heavy sterile neutrino states and interference effects. We implement non-perturbative methods to study the dynamics of the cascade decay to common final states, which features similarities but also noteworthy differences with the case of neutral meson mixing. We show that mixing and oscillations among the nearly degenerate sterile neutrinos can be detected as \\emph{quantum beats} in the distribution of final states produced from their decay. These oscillations would be a telltale signal of mixing between heavy sterile neutrinos. We study in detail the case of two nearly degenerate sterile neutrinos produced in the decay of pseudoscalar mesons and decaying into a purely leptonic "visible" channel: $\
Julien Laurat; Thomas Coudreau; Laurent Longchambon; Claude Fabre
2004-12-14T23:59:59.000Z
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.
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
A nonlinear model for magnetoacoustic waves in dense dissipative plasmas with degenerate electrons
Masood, W. [COMSATS Institute of Information Technology, Islamabad (Pakistan); National Centre for Physics (NCP), Shahdra Valley Road, Islamabad (Pakistan); Jahangir, R.; Siddiq, M. [National Centre for Physics (NCP), Shahdra Valley Road, Islamabad (Pakistan); Eliasson, B. [SUPA, Physics Department, University of Strathclyde, Glasgow (United Kingdom)
2014-10-15T23:59:59.000Z
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.
, 2009. AUniversidad Nacional de Colombia, Department of Mathematics and Statistics, Manizales, Colombia conservation law. Therefore, (1.1) is called strongly degenerate. It is well known that solutions of (1.1), (1-Mail: rburger@ing-mat.udec.cl. CUniversidad Nacional de Colombia, Department of Mathematics, MedellÂ´in, Colombia
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)
2013-07-15T23:59:59.000Z
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.
Bobyrev, Yu V; Petnikova, V M; Rudenko, K V; Shipova, A Yu; Shuvalov, Vladimir V [International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)
2003-11-30T23:59:59.000Z
It is shown that a specific dip in the spectral dependence of the nonlinear response of ultrathin metal films observed by the method of degenerate four-photon spectroscopy is caused by a change in the phases of interfering components of the electron nonlinear susceptibility. This allows one to measure the time scale of subpicosecond intraband processes using picosecond light pulses. (nonlinear optical phenomena)
Progress in year 2010 1. Suppression of Density Fluctuations in a Quantum Degenerate Fermi
Progress in year 2010 1. Suppression of Density Fluctuations in a Quantum Degenerate Fermi Gas with temperatures obtained by fitting the shape of the expanded cloud. 2. Spin gradient demagnetization cooling of ultracold atoms. We have demonstrated a new cooling method in which a time-varying magnetic field gradient
Investigating the role of eEF1A2 in motor neuron degeneration
Griffiths, Lowri Ann
2011-11-25T23:59:59.000Z
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 ...
Mahmood, S.; Sadiq, Safeer; Haque, Q. [Theoretical Physics Division (TPD), PINSTECH, P.O. Nilore, Islamabad 44000 (Pakistan)] [Theoretical Physics Division (TPD), PINSTECH, P.O. Nilore, Islamabad 44000 (Pakistan)
2013-12-15T23:59:59.000Z
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.
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...
Caro, Florian; Saad, Mazen
2012-01-01T23:59:59.000Z
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.
Comments on the Evolution of Strongly Degenerate Neutrinos in the Early Universe
Kazuhide Ichikawa; Masahiro Kawasaki
2003-07-23T23:59:59.000Z
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.
Ata-ur-Rahman,; Qamar, A. [Institute of Physics and Electronics, University of Peshawar, Peshawar 25000 (Pakistan); National Centre for Physics, QAU Campus, Shahdrah Valley Road, Islamabad 44000 (Pakistan); Ali, S. [National Centre for Physics, QAU Campus, Shahdrah Valley Road, Islamabad 44000 (Pakistan); Mirza, Arshad M. [Theoretical Plasma Physics Group, Physics Department, Quaid-i-Azam University, Islamabad 45320 (Pakistan)
2013-04-15T23:59:59.000Z
We have studied the propagation of ion acoustic shock waves involving planar and non-planar geometries in an unmagnetized plasma, whose constituents are non-degenerate ultra-cold ions, relativistically degenerate electrons, and positrons. By using the reductive perturbation technique, Korteweg-deVries Burger and modified Korteweg-deVries Burger equations are derived. It is shown that only compressive shock waves can propagate in such a plasma system. The effects of geometry, the ion kinematic viscosity, and the positron concentration are examined on the ion acoustic shock potential and electric field profiles. It is found that the properties of ion acoustic shock waves in a non-planar geometry significantly differ from those in planar geometry. The present study has relevance to the dense plasmas, produced in laboratory (e.g., super-intense laser-dense matter experiments) and in dense astrophysical objects.
Effects of trapping and finite temperature in a relativistic degenerate plasma
Shah, H. A.; Qureshi, M. N. S. [Physics Department, GC University, Lahore 54000 (Pakistan); Masood, W. [Theoretical Plasma Physics Division, PINSTECH, P.O. Nilore, Islamabad 44000 (Pakistan); Tsintsadze, N. L. [Physics Department, GC University, Lahore 54000 (Pakistan); Institute of Physics, Georgian Academy of Sciences, Tblisi 380077 (Georgia)
2011-10-15T23:59:59.000Z
In the present work, we have undertaken, for the first time, investigation on the effect of trapping on the formation of solitary structures in relativistic degenerate plasmas. Such plasmas have been observed in dense astrophysical objects, and in laboratory these may result due to the interaction of intense lasers with matter. We have used the relativistic Fermi-Dirac distribution to describe the dynamics of the degenerate trapped electrons by solving the kinetic equation. The Sagdeev potential approach has been employed to obtain the arbitrary amplitude solitary structures both when the plasma has been considered cold and when small temperature effects have been taken into account. The theoretical results obtained have been analyzed numerically for different parameter values, and the results have been presented graphically.
The Specific Heat of Normal, Degenerate Quark Matter: Non-Fermi Liquid Corrections
Daniel Boyanovsky; H. J. de Vega
2001-02-26T23:59:59.000Z
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.
From constant to non-degenerately vanishing magnetic fields in superconductivity
Bernard Helffer; Ayman Kachmar
2015-03-30T23:59:59.000Z
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
2014-10-08T23:59:59.000Z
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.
Comparing EFT and Exact One-Loop Analyses of Non-Degenerate Stops
Aleksandra Drozd; John Ellis; Jeremie Quevillon; Tevong You
2015-04-09T23:59:59.000Z
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.
Ali, S. [National Centre for Physics at QAU Campus, Shahdra Valley Road, Islamabad 44000 (Pakistan)] [National Centre for Physics at QAU Campus, Shahdra Valley Road, Islamabad 44000 (Pakistan); Ata-ur-Rahman [National Centre for Physics at QAU Campus, Shahdra Valley Road, Islamabad 44000 (Pakistan) [National Centre for Physics at QAU Campus, Shahdra Valley Road, Islamabad 44000 (Pakistan); Institute of Physics and Electronics, University of Peshawar, Peshawar 25000 (Pakistan)
2014-04-15T23:59:59.000Z
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.
Detection of OH in a flame by degenerate four-wave mixing
Ewart, P.; O'Leary, S.V.
1986-05-01T23:59:59.000Z
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.
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.
2015-06-22T23:59:59.000Z
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.
A degeneration of two-phase solutions of focusing NLS via Riemann-Hilbert problems
Marco Bertola; Pietro Giavedoni
2014-12-06T23:59:59.000Z
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.
Degenerate four-wave mixing spectroscopy of ultrathin Au and Pt films
Bobyrev, Yu V; Petnikova, V M; Rudenko, K V; Shuvalov, Vladimir V [International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)
2002-09-30T23:59:59.000Z
The results of experimental investigations of ultrathin (30 - 40 nm) metal Au and Pt films by means of picosecond degenerate four-wave mixing spectroscopy are presented. Within the model of nonlinear response formation, which takes into account the coherent superposition of contributions from many saturable interband transitions in the real spectrum of electronic states, the characteristic intraband relaxation times are determined to be 230 {+-} 30 fs and 180 {+-} 30 fs for Au and Pt films, respectively. The temperature of the electron subsystem is found to be 600 - 800 K. (nonlinear optical phenomena)
Cao, Pengxiu; Yuan, Yiyuan; Pehek, Elizabeth A.; Moise, Alexander R.; Huang, Ying; Palczewski, Krzysztof; Feng, Zhaoyang
2010-02-19T23:59:59.000Z
mice [2]. Reduction of cytosolic dopamine content either genetically or pharmacologically prevents haSyn-mediated neuronal degeneration in vitro [1]. It also has been suggested that a-synuclein overexpression disrupts vesicular pH, leading... were conducted with a Leica TCS SP2 confocal microscope. The spectra used were: DsRed(lex = 543nm and lem = 580–630nm) and GFP(lex = 488nm and lem = 510– 530nm). To count fluorescent DAergic neuron numbers, living worms were immobilized with 30 m...
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)
2009-02-20T23:59:59.000Z
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.
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.
2014-01-01T23:59:59.000Z
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
Riaud, Antoine; Baudoin, Michael; Matar, Olivier Bou
2015-01-01T23:59:59.000Z
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
2008-11-03T23:59:59.000Z
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.
Bobyrev, Yu V; Voronov, Aleksandr V; Petnikova, V M; Rudenko, K V; Shuvalov, Vladimir V [International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)
2005-01-31T23:59:59.000Z
The electronic nonlinear response {chi}{sup (3)}{sub ee} of high-temperature superconductor films in methods of degenerate four-photon spectroscopy is calculated. It is shown that the model considering interband electronic transitions in a 'real' band structure with the only fitting parameter (the electron-phonon relaxation rate) well describes all the experimental spectral features of the response, and the methods of degenerate four-photon spectroscopy themselves can reveal, due to the interference character of {chi}{sup (3)}{sub ee}, the presence of the energy gap in the spectrum of states. (laser applications and other topics in quantum electronics)
Degenerate three-level laser with parametric amplifier and squeezed vacuum
Eyob Alebachew; K. Fesseha
2007-01-31T23:59:59.000Z
Applying stochastic differential equations, we study the squeezing and statistical properties of the cavity and output modes of a degenerate three-level laser whose cavity contains a parametric amplifier and coupled to a squeezed vacuum reservoir. We consider the case in which the top and bottom levels of the three-level cascade atoms injected into the cavity are coupled by the pump mode emerging from the parametric amplifier. It turns out that the presence of the squeezed vacuum reservoir and the parametric amplifier contribute considerably to the mean photon number and the degree of squeezing of the cavity and output modes. It appears that almost perfect squeezing can be achieved at steady state and at threshold for a suitable choice of parameters.
Degenerate limit thermodynamics beyond leading order for models of dense matter
Constantinou, Constantinos; Prakash, Madappa; Lattimer, James M
2015-01-01T23:59:59.000Z
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...
Latyshev, A V
2015-01-01T23:59:59.000Z
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.
Khan, S. A. [National Centre for Physics, Quaid-i-Azam University Campus, Islamabad 45320 (Pakistan); Ayub, M. K. [National Centre for Physics, Quaid-i-Azam University Campus, Islamabad 45320 (Pakistan); Theoretical Plasma Physics Division, PINSTECH, P. O. Nilore, Islamabad (Pakistan); Pohang University of Science and Technology (POSTECH), Pohang, Gyunbuk 790-784 (Korea, Republic of); Ahmad, Ali [National Centre for Physics, Quaid-i-Azam University Campus, Islamabad 45320 (Pakistan); Theoretical Plasma Physics Division, PINSTECH, P. O. Nilore, Islamabad (Pakistan); Department of Physics, COMSATS Institute of Information Technology, Islamabad 44000 (Pakistan)
2012-10-15T23:59:59.000Z
Quantum plasma oscillations are studied in a strongly magnetized, ultra-dense plasma with degenerate electrons and positrons. The dispersive role of electron and positron quantum effects on low frequency (in comparison to electron cyclotron frequency) shear electromagnetic wave is investigated by employing hydrodynamic formulation. In the presence of ions, the density balance changes, and the electromagnetic wave (with frequency lower than the ion cyclotron frequency) is shown to couple with electrostatic ion mode under certain conditions. For such low frequency waves, it is also seen that the contribution of electron and positron degeneracy pressure is dominant as compared to their diffraction effects. The results are analyzed numerically for illustrative purpose pointing out their relevance to the dense laboratory (e.g., super-intense laser-dense matter interactions) and astrophysical plasmas.
Nonlinear screening effect in an ultrarelativistic degenerate electron-positron gas
Tsintsadze, N. L. [Salam Chair in Physics, Government College University, Lahore 54000 (Pakistan); Department of Physics, Government College University, Lahore 54000 (Pakistan); Rasheed, A.; Shah, H. A. [Department of Physics, Government College University, Lahore 54000 (Pakistan); Murtaza, G. [Salam Chair in Physics, Government College University, Lahore 54000 (Pakistan)
2009-11-15T23:59:59.000Z
Nonlinear screening process in an ultrarelativistic degenerate electron-positron gas has been investigated by deriving a generalized nonlinear Poisson equation for the electrostatic potential. In the simple one-dimensional case, the nonlinear Poisson equation leads to Debye-like (Coulomb-like) solutions at distances larger (less) than the characteristic length. When the electrostatic energy is larger than the thermal energy, this nonlinear Poisson equation converts into the relativistic Thomas-Fermi equation whose asymptotic solution in three dimensions shows that the potential field goes to zero at infinity much more slowly than the Debye potential. The possibility of the formation of a bound state in electron-positron plasma is also indicated. Further, it is investigated that the strong spatial fluctuations of the potential field may reduce the screening length and that the root mean square of this spatial fluctuating potential goes to zero for large r rather slowly as compared to the case of the Debye potential.
On the ordinary mode and whistler mode instabilities in the degenerate anisotropic plasmas
Iqbal, Z.; Hussain, A. [Department of Physics, G. C. University Lahore, Katchery Road, Lahore 54000 (Pakistan)] [Department of Physics, G. C. University Lahore, Katchery Road, Lahore 54000 (Pakistan); Murtaza, G. [Department of Physics, G. C. University Lahore, Katchery Road, Lahore 54000 (Pakistan) [Department of Physics, G. C. University Lahore, Katchery Road, Lahore 54000 (Pakistan); Salam Chair in Physics, G. C. University Lahore, Katchery Road, Lahore 54000 (Pakistan); Tsintsadze, N. L., E-mail: abbasiravian@yahoo.com [Department of Plasma Physics, E. Andronikashvili Institute of Physics, Tbilisi, Georgia (United States); Department of Physics, G. C. University Lahore, Katchery Road, Lahore 54000 (Pakistan)
2014-03-15T23:59:59.000Z
Employing Vlasov-Maxwell set of equations, we have investigated the O-mode and whistler mode instability in a degenerate anisotropic magnetoplasma environment and compared the results to those reported for classical plasmas. We propose the excitation of a new banded type of instability for the O-mode case, which grows at some particular values of temperature anisotropy and external magnetic field. For the case of whistler wave, we observe instability saturation mechanism similar to the case of classical plasmas. The existence of both O-mode and whistler mode instability has been observed only for some specific range of unstable wavenumbers. The possible excitation of such instabilities in solid state plasma has been discussed, particularly for semiconductor and semimetal plasmas.
Ion-acoustic solitary waves in ultra-relativistic degenerate pair-ion plasmas
Rasheed, A.; Tsintsadze, N. L. [Department of Physics, G.C. University, Lahore 54000 (Pakistan); Salam Chair in Physics, G.C. University, Lahore 54000 (Pakistan); Murtaza, G. [Salam Chair in Physics, G.C. University, Lahore 54000 (Pakistan)
2011-11-15T23:59:59.000Z
The arbitrary and the small amplitude ion-acoustic solitary waves (IASWs) have been studied. The former is studied by using the Sagdeev pseudo-potential approach in a plasma consisting of the degenerate ultrarelativistic electrons, positrons, and the non-relativistic classical ions. It is seen that only compressive solitary waves can propagate through such plasmas. The numerical calculations show that the region of existence of the ion-acoustic solitary waves depends upon the positron (ion) number density and the plasma thermal temperature. This study is appropriate for applications in inertial confinement fusion laboratory research as well as the study of astrophysical dense objects such as white dwarf and dense neutron stars.
The Construction of Spinor Fields on Manifolds with Smooth Degenerate Metrics
J Schray; T Dray; C A Manogue; R W Tucker; C Wang
1996-05-17T23:59:59.000Z
We examine some of the subtleties inherent in formulating a theory of spinors on a manifold with a smooth degenerate metric. We concentrate on the case where the metric is singular on a hypersurface that partitions the manifold into Lorentzian and Euclidean domains. We introduce the notion of a complex spinor fibration to make precise the meaning of continuity of a spinor field and give an expression for the components of a local spinor connection that is valid in the absence of a frame of local orthonormal vectors. These considerations enable one to construct a Dirac equation for the discussion of the behavior of spinors in the vicinity of the metric degeneracy. We conclude that the theory contains more freedom than the spacetime Dirac theory and we discuss some of the implications of this for the continuity of conserved currents.
Degenerate optomechanical parametric oscillators: cooling in the vicinity of a critical point
Degenfeld-Schonburg, Peter; Hartmann, Michael J; Navarrete-Benlloch, Carlos
2015-01-01T23:59:59.000Z
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.
Gravitational Wave Emission from the Single-Degenerate Channel of Type Ia Supernovae
David Falta; Robert T. Fisher; Gaurav Khanna
2011-05-28T23:59:59.000Z
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.
Bethe Ansatz and Ordinary Differential Equation Correspondence for Degenerate Gaudin Models
Omar El Araby; Vladimir Gritsev; Alexandre Faribault
2012-04-25T23:59:59.000Z
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.
Nonlinear response of ultrathin Ni films in degenerate four-photon spectroscopy
Kuznetsova, L P [M.V. Lomonosov Moscow State University, Moscow (Russian Federation); Petnikova, V M; Rudenko, K V; Shuvalov, Vladimir V [International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)
2000-02-28T23:59:59.000Z
The ultrathin (17 - 25 nm thick) continuous Ni films deposited on K8 glass and ZrO{sub 2} substrates are experimentally studied. The degenerate four-photon spectroscopy showed typical resonances in the dependence of the self-diffraction efficiency on the wavelength of pump components. It is shown within the framework of the model of electronic cubic nonlinear susceptibility - taking into account the real structure of the spectrum of electronic states of Ni, its quantum-size renormalisation and spin splitting, the inter- and intraband relaxation, saturation, and the selection rules for the electronic transitions - that the electronic subsystem makes the dominant contribution to the nonlinear response of Ni films to picosecond laser pulses (20 ps long) in the 620 - 634 nm spectral range. The interband-polarisation relaxation time T{sub 2} was found to be {approx}200 fs. (laser applications and other topics in quantum electronics)
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)
1993-12-01T23:59:59.000Z
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.
Dobrescu, Bogdan E.
2009-06-02T23:59:59.000Z
, 73], spin transitions, relaxation and hysteresis in nanomagnets [74, 75, 76, 77, 78], Bose-Einstein condensates [79, 80, 81, 82, 83, 84], production of Feshbach molecules from quantum degenerate Fermi gases [16, 17, 18, 19, 21, 20, 22, 23, 24...
Age-related changes in False Recognition: An ERP Study
Robb, Lindsey
2011-01-01T23:59:59.000Z
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...
Age Related Changes in Motion Perception and Perceptual Learning
Bower, Jeffrey Dennis
2010-01-01T23:59:59.000Z
simple stimuli after training. This type of learning differsfrom other types of learning in that it is hypothesized toin the other type of stimuli, transfer of learning between
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)
2013-02-15T23:59:59.000Z
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.
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
2014-11-25T23:59:59.000Z
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.
Hillman, Yael; Kovetz, Attay; Shara, Michael M
2015-01-01T23:59:59.000Z
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...
Electromagnetically induced absorption due to transfer of population in degenerate two-level systems
Goren, C.; Rosenbluh, M. [Department of Physics, Bar-Ilan University, Ramat Gan 52900 (Israel); Wilson-Gordon, A.D.; Friedmann, H. [Department of Chemistry, Bar-Ilan University, Ramat Gan 52900 (Israel)
2004-10-01T23:59:59.000Z
We predict the occurrence of electromagnetically induced absorption (EIA) in cycling degenerate two-level transitions where F{sub e}=F{sub g}+1 and F{sub g}>0, interacting with pump and probe lasers with the same polarization. The EIA is due to transfer of population (TOP) between the Zeeman levels of the ground hyperfine state, rather than transfer of coherence (TOC) which occurs for perpendicularly polarized lasers. We model EIA-TOP using a double two-level system (TLS) which we compare with the four-level N system, which models EIA-TOC. When the pump intensity is low, both models give an EIA peak at line center. The effect of introducing phase-changing collisions is studied, in the presence and absence of Doppler broadening, for both the double TLS and N systems. In the presence of phase-changing collisions, the central EIA peaks are narrowed in both models and persist to higher pump Rabi frequencies than in the absence of collisions. In the double TLS, in the presence of Doppler broadening, the central EIA-TOP peak becomes narrower and does not develop a dip in its center, in contrast to the N system. The central dip that appears in the Doppler-broadened EIA-TOC spectrum can be wiped out by adding phase-changing collisions. We demonstrate that EIA-TOP can be obtained for realistic atomic transitions interacting with lasers that have the same polarization.
Electrostatic soliton and double layer structures in unmagnetized degenerate pair plasmas
Mahmood, S. [Theoretical Plasma Physics Division (TPPD), PINSTECH, P.O. Nilore, Islamabad 44000 (Pakistan); National Centre for Physics, Quaid-i-Azam University Campus, Shahdra Valley Road, Islamabad 44000 (Pakistan); Department of Physics and Applied Mathematics (DPAM), PIEAS, P.O. Nilore, Islamabad 44000 (Pakistan); Khan, S. A. [National Centre for Physics, Quaid-i-Azam University Campus, Shahdra Valley Road, Islamabad 44000 (Pakistan); Department of Physics, COMSATS Institute of Information Technology (CIIT), Islamabad 44000 (Pakistan); Ur-Rehman, H. [Theoretical Plasma Physics Division (TPPD), PINSTECH, P.O. Nilore, Islamabad 44000 (Pakistan); Department of Physics and Applied Mathematics (DPAM), PIEAS, P.O. Nilore, Islamabad 44000 (Pakistan)
2010-11-15T23:59:59.000Z
The acoustic solitons and double layers are studied in unmagnetized quantum electron-positron plasmas in the presence of stationary ions. The quantum hydrodynamic model is employed and reductive perturbation method is used to derive the Korteweg-de Vries (KdV) and extended KdV equations for solitons and double layers, respectively. It is found that in the linear limit both slow acoustic and fast Langmuir waves can propagate in such type of quantum plasmas like in classical pair-ion or pair plasmas. The amplitude and width of the electrostatic solitons are found to be decreasing with the increase in concentration of positrons (or decrease in the concentration of ions) in degenerate electron-positron-ion plasmas. It is found that only rarefactive double layer can exist in such plasmas which depend on various parameters. The dependence of double layer structure on ion concentration and quantum diffraction effects of electrons and positrons are also discussed. The results are also elaborated graphically by considering dense plasma parameters in the outer layers of astrophysical objects such as white dwarfs and neutron stars.
Smoothed Particle Hydrodynamics simulations of the core-degenerate scenario for Type Ia supernovae
Aznar-Siguán, G; Lorén-Aguilar, P; Soker, N; Kashi, A
2015-01-01T23:59:59.000Z
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...
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
Biocompatibility of an implantable ophthalmic drug delivery device
Cohen, Sarah J. (Sarah Jennifer)
2007-01-01T23:59:59.000Z
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 ...
Non-Fermi-Liquid Specific Heat of Normal Degenerate Quark Matter
A. Gerhold; A. Ipp; A. Rebhan
2004-08-31T23:59:59.000Z
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)
2013-08-10T23:59:59.000Z
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.
Carlos Navarrete-Benlloch; Germán J. de Valcárcel; Eugenio Roldán
2009-10-13T23:59:59.000Z
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)
2014-02-28T23:59:59.000Z
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
2015-01-01T23:59:59.000Z
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
2015-04-12T23:59:59.000Z
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.
Mahadev Patgiri; N. Nimai Singh
2003-01-29T23:59:59.000Z
An attempt is made to generate the bimaximal mixings of the three species of neutrinos from the textures of the right-handed Majorana neutrino mass matrices. We extend our earlier work in this paper for the generation of the nearly degenerate as well as the inverted hierarchical models of the left-handed Majorana neutrino mass matrices using the non-diagonal textures of the right-handed Majorana neutrino mass matrices and the diagonal form of the Dirac neutrino mass matrices, within the frame work of the seesaw mechanism in a model independent way. Such Majorana neutrino mass models are important to explain the recently reported result on the neutrinoless double beat decay (0/nu/beta/beta) experiment,together with the earlier established data on LMA MSW solar and atmospheric neutrino oscillations.
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
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
2015-01-01T23:59:59.000Z
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-...
Peter Degenfeld-Schonburg; Carlos Navarrete-Benlloch; Michael J. Hartmann
2015-03-11T23:59:59.000Z
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
2015-01-01T23:59:59.000Z
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...
Wes Armour; Simon Hands; Costas Strouthos
2013-02-07T23:59:59.000Z
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
RXJ0806.3+1527: a double degenerate binary with the shortest known orbital period (321s)
G. L. Israel; W. Hummel; S. Covino; S. Campana; I. Appenzeller; W. Gassler; K. -H. Mantel; G. Marconi; C. W. Mauche; U. Munari; I. Negueruela; H. Nicklas; G. Rupprecht; R. L. Smart; O. Stahl; L. Stella
2002-03-04T23:59:59.000Z
We carried out optical observations of the field of the X-ray pulsator RXJ0806.3+1527. A blue V=21.1 star was found to be the only object consistent with the X-ray position. VLT FORS spectra revealed a blue continuum with no intrinsic absorption lines. Broad (v~1500 km/s), low equivalent width (about -1/-6A) emission lines from the HeII Pickering series were clearly detected. B, V and R time-resolved photometry revealed the presence of about 15% pulsations at the 321s X-ray period, confirming the identification. These findings, together with the period stability and absence of any additional modulation in the 1min-5hr period range, argue in favour of the orbital interpretation of the 321s pulsations. The most likely scenario is thus that RXJ0806.3+1527 is a double degenerate system of the AM CVn class. This would make RXJ0806.3+1527 the shortest orbital period binary currently known and one of the best candidates for gravitational wave detection.
Tadashi Nakajima; Masahiro Morikawa
2005-06-25T23:59:59.000Z
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.
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)
2013-02-15T23:59:59.000Z
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.
Bobyrev, Yu V; Petnikova, V M; Rudenko, K V; Shuvalov, Vladimir V [International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)
2005-08-31T23:59:59.000Z
It is shown that the spectral-temporal and temperature 'anomalies' of the kinetics of reflection and transmission coefficients of high-temperatures superconductors (HTSCs) at high 'impact' excitation levels have direct analogies also in the case when the instant state of samples is probed by using the self-diffraction of probe pulses made coincident in time and propagating at an angle to each other. The possibility of using the transient modification of the method of degenerate four-photon spectroscopy for the HTSC diagnostics substantially expands the scope of experiments that can confirm or refute the correctness of the model based on the consideration of the contribution of interband electronic transitions to the response of an excited HTSC film with the 'frozen' energy gap. (nonlinear optical phenomena)
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
Endopolyploidy Changes with Age-Related Polyethism in the Honey Bee, Apis mellifera
Rangel, Juliana; Strauss, Kim; Seedorf, Kaileah; Hjelmen, Carl E.; Johnston, J. Spencer
2015-04-16T23:59:59.000Z
(brain) cells and the stinger (P muscles. Ploidy in thoracic muscle dropped from an average of 0.5 rounds of replication in newly emerged...
Brain site-specific proteome changes in aging-related dementia
Manavalan, Arulmani; Mishra, Manisha; Feng, Lin; Sze, Siu Kwan; Akatsu, Hiroyasu; Heese, Klaus
2013-01-01T23:59:59.000Z
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
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
Hyperactive p53 leads to age-related phenotypes in mice model
Ou, Linda Ye
2009-01-01T23:59:59.000Z
Senescence through p53- and pRB-mediated Pathways. Journalof retinoblastoma gene product (pRB), thus delayingdissociation of E2F-pRB complex and S-phase entry of the
GABAergic systems in a model of age-related cognitive impairment
LaSarge, Candi Lynn
2012-07-16T23:59:59.000Z
cohort of young and aged rats was characterized in an odor discrimination task. Similar to aged rat water maze performance, some aged rats performed odor learning discrimination problems on par with the young cohort (i.e. aged-unimpaired) and some aged...
Neurobiology of Aging 26 (2005) 12151227 Age-related alterations in white matter microstructure
Corkin, Suzanne
2005-01-01T23:59:59.000Z
.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 breeding biology of the redhead duck in southwestern Manitoba
Johnson, David John
1978-01-01T23:59:59.000Z
scaup (Qt~h a affinis) at Yellowknife, Northwest Territories (Trauger 1971:48- 49). For North American members of ~A th a, information regarding migra- tional homing is limited. Mendall (1958) and Coulter and Miller (1968) reported observations...
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.
1990-01-01T23:59:59.000Z
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...
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
Age-related breeding biology of the redhead duck in southwestern Manitoba
Johnson, David John
1978-01-01T23:59:59.000Z
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...
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
alkanes and alkenes. Queen larvae showed lower variations in age-related differences.
Paris-Sud XI, Université de
que la quantité absolue de substances odorantes (et hydrocarbures) augmentait avec l'âge des larves et). On a identifié 62 hydrocarbures (alcanes, alcènes, dialcènes, alcanes méthy- liques et alcanes diméthyliques, N = 6) du bou- quet odorant total. Dans une analyse factorielle portant sur 28 hydrocarbures (il n
The effects of changing exercise levels on weight and age-related weight gain
Williams, Paul T.; Wood, Peter D.
2004-01-01T23:59:59.000Z
cumulative energy intake to Some of the Intra-individual variability in expenditure is estimated be less than 2% of energy expenditure
TEACHING ABOUT THE BIOLOGICAL CLOCK: Age-Related Fertility Decline and Sex Education
Macintosh, Kerry Lynn
2015-01-01T23:59:59.000Z
to choose motherhood over education or work. 180 Id. at 352.comprehensive sexual health education . ?. ?. ?. ”) (receive HIV/AIDS prevention education once in middle school
Influence of Surfactants on the Aggregation Behavior of Water-Soluble Dendritic Phthalocyanines
Wu, Chi
in the treatment of a range of cancers, macular degeneration, and infectious diseases.1,2 One of the key factors the nucleoprotein histone,4e can usually prevent the formation of ag- gregates to a certain extent, giving), for example, greatly increases the excited-state lifetime of zinc(II) tetrasulfonated phthalocyanine in water
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., E-mail: borisovk@tcd.ie; Coey, J. M. D.; Stamenov, P. [School of Physics and CRANN, Trinity College, Dublin 2 (Ireland); Alaria, J. [Department of Physics, University of Liverpool, Liverpool L69 7ZE (United Kingdom)
2014-05-07T23:59:59.000Z
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)
2013-07-20T23:59:59.000Z
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
2010-01-01T23:59:59.000Z
31 Table 2. NEP versus EP …………. ………………………………………………Table 4. NEP and English ………. ……………….………………………………other was maximally distinct (NEP). The MALs shared the same
Kahn, Meredith K
2014-11-25T23:59:59.000Z
other amino acids, 22% of which are proline and 4-hydroxyproline, respectively (Platt, 1996). Fibril formation is critical for achieving the physiologic strength of the collagen framework (Ray et al., 1996). Type II collagen is synthesized... extensions serving as useful markers to monitor collagen synthesis. As collagen is synthesized, the newly released type II collagen molecules associate in the matrix to form the collagen fibrils by means of intermolecular cross-linking (Platt, 1996...
Scarcelli, Giuliano
The biophysical and biomechanical properties of the crystalline lens (e.g., viscoelasticity) have long been implicated in accommodation and vision problems, such as presbyopia and cataracts. However, it has been difficult ...
Gospodaryov, Dmytro V; Yurkevych, Ihor S; Jafari, Mahtab; Lushchak, Volodymyr I; Lushchak, Oleh V
2013-01-01T23:59:59.000Z
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
Gospodaryov, Dmytro V; Yurkevych, Ihor S; Jafari, Mahtab; Lushchak, Volodymyr I; Lushchak, Oleh V
2013-01-01T23:59:59.000Z
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
2014-11-25T23:59:59.000Z
were grouped by age, with yearlings (yearling; n = 3 males, n = 3 females), 2 to 3 yr olds (2/3; n = 2 males, n = 4 females), and mature 5 to 8 yr olds (mature; n = 2 males, n = 4 females). On d 0, all horses were housed individually and fed diets...
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
2015-01-07T23:59:59.000Z
, 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...
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)
2013-08-20T23:59:59.000Z
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.; Motta, Andrea
2014-11-06T23:59:59.000Z
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
2013-01-01T23:59:59.000Z
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
2013-01-01T23:59:59.000Z
The antioxidant compound resveratrol increases activity ofet al. , 2008). Resveratrol increases both activation andMudò et al. , 2012). Resveratrol mimics this protective
Preprocessing and Reduction for Degenerate Semidefinite Programs
2011-02-18T23:59:59.000Z
Feb 18, 2011 ... Sensitivity analysis and backward stability results are presented in Section 4. .... Applications that exploit the failure of Slater's CQ for SDP ...
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)
2012-08-10T23:59:59.000Z
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.
Hanlon, Justin, E-mail: jhanlon@orayainc.com; Chell, Erik; Firpo, Michael; Koruga, Igor [Oraya Therapeutics, Inc., Newark, California 94560 (United States)] [Oraya Therapeutics, Inc., Newark, California 94560 (United States)
2014-02-15T23:59:59.000Z
Purpose: New technology has been developed to treat age-related macular degeneration (AMD) using 100 kVp pencil-beams that enter the patient through the radio-resistant sclera with a depth of interest between 1.6 and 2.6 cm. Measurement of reference and relative dose in a kilovoltage x-ray beam with a 0.42 cm diameter field size and a 15 cm source to axis distance (SAD) is a challenge that is not fully addressed in current guidelines to medical physicists. AAPM's TG-61 gives dosimetry recommendations for low and medium energy x-rays, but not all of them are feasible to follow for this modality. Methods: An investigation was conducted to select appropriate equipment for the application. PTW's Type 34013 Soft X-Ray Chamber (Freiburg, Germany) and CIRS's Plastic Water LR (Norfolk, VA) were found to be the best available options. Attenuation curves were measured with minimal scatter contribution and thus called Low Scatter Tissue Air Ratio (LSTAR). A scatter conversion coefficient (C{sub scat}) was derived through Monte Carlo radiation transport simulation using MCNPX (LANL, Los Alamos, NM) to quantify the difference between a traditional TAR curve and the LSTAR curve. A material conversion coefficient (C{sub mat}) was determined through experimentation to evaluate the difference in attenuation properties between water and Plastic Water LR. Validity of performing direct dosimetry measurements with a source to detector distance other than the treatment distance, and therefore a different field size due to a fixed collimator, was explored. A method—Integrated Tissue Air Ratio (ITAR)—has been developed that isolates each of the three main radiological effects (distance from source, attenuation, and scatter) during measurement, and integrates them to determine the dose rate to the macula during treatment. Results: LSTAR curves were determined to be field size independent within the range explored, indicating that direct dosimetry measurements may be performed with a source to detector distance of 20 cm even though the SAD is 15 cm during treatment. C{sub scat} varied from 1.102 to 1.106 within the range of depths of interest. The experimental variance among repeated measurements of C{sub mat} was larger than depth dependence, so C{sub mat} was estimated as1.019 for all depths of interest. Conclusions: Equipment selection, measurement techniques, and formalism for the determination of dose rate to the macula during stereotaxy for AMD have been determined and are strongly recommended by the authors of this paper to be used by clinical medical physicists.
Tools for primal degenerate linear programs: IPS, DCA, and PE
2014-10-01T23:59:59.000Z
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-
Row-Reduced Column Generation for Degenerate Master Problems
2013-02-06T23:59:59.000Z
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.
PML in the brain: From development to degeneration
Korb, E; Finkbeiner, SM
2013-01-01T23:59:59.000Z
1? (PP1?) and retinoblastoma protein (pRB), which resultsin dephosphorylation of pRB and controls neuronal
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)
2014-10-10T23:59:59.000Z
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.
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
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
Lipschitz conformal immersions from degenerating Riemann surfaces with L2
RiviÃ¨re, Tristan
(I.1) we can define the Gauss map as being the following measurable map in L () taking values and |dn|2 g dvolg canonical metric gRm of Rm . This energy E can be hence seen as being the Dirichlet Energy of the Gauss map n with respect to the induced
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)
2014-09-08T23:59:59.000Z
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.
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
A minimum problem with free boundary for a degenerate quasilinear ...
2005-03-04T23:59:59.000Z
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.
Magnetic Fields in Quantum Degenerate Systems and in Vacuum
H. Perez Rojas; E. Rodriguez Querts
2006-12-28T23:59:59.000Z
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.
Studies of a Quantum Degenerate Fermionic Lithium Gas Zoran Hadzibabic
that the lifetime of the strongly interacting system is long enough to observe a superfluid transition in the future of strongly interacting spin-mixtures of ultracold fermions. We have cooled a magnetically trapped spin-polarized 6Li Fermi gas into quantum degen- eracy by sympathetic cooling with bosonic 23Na. In order to do
On the structure of attractors for a class of degenerate reaction-diffusion systems
Demaret, Laurent
in [2], where the exis- tence of solutions and of global compact attractor has been shown. Furthermore of the solutions belonging to the global compact attractor. It is shown that for such solutions, the degeneracy
Mind the edge! The role of adjacency matrix degeneration in maximum entropy weighted network models
Sagarra, Oleguer; Díaz-Guilera, Albert
2015-01-01T23:59:59.000Z
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...
Fluctuations and state preparation in quantum degenerate gases of sodium and lithium
Su, Edward (Edward Joseph)
2014-01-01T23:59:59.000Z
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; ...
Wong, Benjamin L.
2009-01-01T23:59:59.000Z
of a subchondral bone perforation on the load supportPerforations . 203subchondral bone plate perforation. Trans Orthop Res Soc 31:
Observation of Degenerate One-Dimensional Sub-Bands in Cylindrical InAs Nanowires
Javey, Ali
. The p+ Si substrate is used as the global back-gate. The source (S) and drain (D) contacts were defined-sectional structure of a representative back-gated InAs NW device is shown in Figure 1a. The InAs NWs used, 2012 Figure 1. (a) Schematic of the cross-sectional structure of a representative back
Level set simulations of turbulent thermonuclear deflagration in degenerate carbon and oxygen
W. Schmidt; W. Hillebrandt; J. C. Niemeyer
2005-08-02T23:59:59.000Z
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.
2007-01-01T23:59:59.000Z
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
Non-degenerate pump-probe spectroscopy of single GaN nanowires
Upadhya, Prashanth C [Los Alamos National Laboratory; Taylor, Antoinette J [Los Alamos National Laboratory; Prasankumar, Rohiy P [Los Alamos National Laboratory; Wang, George T [SNL; Martinez, Julio A [SNL; Li, Qiming [SNL; Swartzentruber, Brian S [SNL
2010-01-01T23:59:59.000Z
Spatially-resolved ultrafast transient absorption measurements on a single GaN nanowire give insight into carrier relaxation dynamics as a function of the probe polarization and position on the nanowire on a femtosecond timescale. The synthesis and optical characterization of semiconductor nanowires (NWs) has gained considerable attention in recent years owing to their unique electronic and optical properties that arise from their anisotropic geometry, large surface to volume ratio and two-dimensional quasiparticle confinement, Post-growth characterization of their properties is crucial in understanding the fundamental physical processes that can lead to enhanced functionality of NW-based devices, In particular, it is important to understand the carrier relaxation pathways in individual NWs, since the geometry of these nanostructures can significantly influence carrier recombination and/or trapping. In this respect, ultrafast optical techniques offer reliable and non-contact spectroscopic tools to study carrier dynamics in semiconductor nanostructures. In summary, time-resolved optical pump-probe spectroscopy was performed on single GaN NWs. These measurements give insight into the different processes that govern carrier capture, particularly at surface states, and relaxation in individual nanostructures. Our experiments thus demonstrate the value of single-particle ultrafast optical spectroscopy in understanding the physical processes that govern the properties of semiconductor NWs, while suggesting approaches to optimize NW-based devices for nanophotonic applications.
Research Recruiting Endogenous Tissue Stem Cells to Repair Injury and Degeneration
Peterson, Daniel A. [Rosalind Franklin University of Medicine and Science
2014-10-22T23:59:59.000Z
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.
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
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
E. V. Felk; A. P. Kuznetsov; A. V. Savin
2013-11-13T23:59:59.000Z
The effect of small nonlinear dissipation on the dynamics of system with stochastic web which is linear oscillator driven by pulses is studied. The scenario of coexisting attractors evolution with the increase of nonlinear dissipation is revealed. It is shown that the period-doubling transition to chaos is possible only for third order resonance and only hard transitions can be seen for all other resonances.
Spin effect on parametric decay of oblique Langmuir wave in degenerate magneto-plasmas
Shahid, M. [Salam Chair in Physics, Government College University, Lahore-54000 (Pakistan) [Salam Chair in Physics, Government College University, Lahore-54000 (Pakistan); Department of Physics, Government College University, Lahore-54000 (Pakistan); Murtaza, G. [Salam Chair in Physics, Government College University, Lahore-54000 (Pakistan)] [Salam Chair in Physics, Government College University, Lahore-54000 (Pakistan)
2013-08-15T23:59:59.000Z
The electron spin ?1/2 effects on the parametric decay instability of oblique Langmuir wave into low-frequency electromagnetic shear Alfven wave and Left-Handed Circularly Polarized wave (LHCP) has been investigated in detail, in an electron-ion quantum plasma immersed in the uniform external magnetic field. Incorporating the quantum effects due to electron spin, Fermi pressure and Bohm potential term, the quantum magneto-hydrodynamic (QMHD) model has been used to investigate the linear and nonlinear response of the plasma species for three-wave coupling interaction in a quantum magneto-plasmas. Nonlinear dispersion relations and growth rate of the problem have been derived analytically. It has been shown that the spin of electrons has considerable effect on the growth rate of parametric instability problem even when the external magnetic field B{sub 0} is below the quantum critical magnetic field strength B{sub Q}=4.4138×10{sup 13}G.
Bigelow, Stephen
plays a prominent role in phase field models of fluids and soft materials but the methodology has a more separation that occurs in an isothermal binary system when a spatially uniform mixture is quenched below
Degenerate Ising model for atomistic simulation of crystal-melt interfaces
Schebarchov, D., E-mail: Dmitri.Schebarchov@gmail.com [University Chemical Laboratories, Lensfield Road, Cambridge CB2 1EW (United Kingdom); Schulze, T. P., E-mail: schulze@math.utk.edu [Department of Mathematics, University of Tennessee, Knoxville, Tennessee 37996-1300 (United States); Hendy, S. C. [The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington 6140 (New Zealand) [The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington 6140 (New Zealand); Department of Physics, University of Auckland, Auckland 1010 (New Zealand)
2014-02-21T23:59:59.000Z
One of the simplest microscopic models for a thermally driven first-order phase transition is an Ising-type lattice system with nearest-neighbour interactions, an external field, and a degeneracy parameter. The underlying lattice and the interaction coupling constant control the anisotropic energy of the phase boundary, the field strength represents the bulk latent heat, and the degeneracy quantifies the difference in communal entropy between the two phases. We simulate the (stochastic) evolution of this minimal model by applying rejection-free canonical and microcanonical Monte Carlo algorithms, and we obtain caloric curves and heat capacity plots for square (2D) and face-centred cubic (3D) lattices with periodic boundary conditions. Since the model admits precise adjustment of bulk latent heat and communal entropy, neither of which affect the interface properties, we are able to tune the crystal nucleation barriers at a fixed degree of undercooling and verify a dimension-dependent scaling expected from classical nucleation theory. We also analyse the equilibrium crystal-melt coexistence in the microcanonical ensemble, where we detect negative heat capacities and find that this phenomenon is more pronounced when the interface is the dominant contributor to the total entropy. The negative branch of the heat capacity appears smooth only when the equilibrium interface-area-to-volume ratio is not constant but varies smoothly with the excitation energy. Finally, we simulate microcanonical crystal nucleation and subsequent relaxation to an equilibrium Wulff shape, demonstrating the model's utility in tracking crystal-melt interfaces at the atomistic level.
Wick rotation for quantum field theories on degenerate Moyal space(-time)
Grosse, Harald; Lechner, Gandalf [Department of Physics, University of Vienna, 1090 Vienna (Austria)] [Department of Physics, University of Vienna, 1090 Vienna (Austria); Ludwig, Thomas [Max-Planck-Institute for Mathematics in the Sciences, 04103 Leipzig (Germany) [Max-Planck-Institute for Mathematics in the Sciences, 04103 Leipzig (Germany); Institute for Theoretical Physics, University of Leipzig, 04009 Leipzig (Germany); Verch, Rainer [Institute for Theoretical Physics, University of Leipzig, 04009 Leipzig (Germany)] [Institute for Theoretical Physics, University of Leipzig, 04009 Leipzig (Germany)
2013-02-15T23:59:59.000Z
In this paper the connection between quantum field theories on flat noncommutative space(-times) in Euclidean and Lorentzian signature is studied for the case that time is still commutative. By making use of the algebraic framework of quantum field theory and an analytic continuation of the symmetry groups which are compatible with the structure of Moyal space, a general correspondence between field theories on Euclidean space satisfying a time zero condition and quantum field theories on Moyal Minkowski space is presented ('Wick rotation'). It is then shown that field theories transferred to Moyal space(-time) by Rieffel deformation and warped convolution fit into this framework, and that the processes of Wick rotation and deformation commute.
Antiferromagnetic Exchange Interaction between Electrons on Degenerate LUMOs in Benzene Dianion
Matsuura, Hiroyasu; Fukuyama, Hidetoshi
2012-01-01T23:59:59.000Z
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.
Hickox, Ann E
2013-01-01T23:59:59.000Z
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 ...
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
J. Am. Chem. SOC.1991, 113, 3451-3458 3451 Degenerate Transesterification of
Smith, Bradley D.
aggregatespecies: THF tetramer, 6.5;DME tetramer, 3.3 (40 "C);dioxolane, 13, hexamer, 71; pyridine tetramer, 2. These results are interpreted in terms of a preequilibrium in which a solventon lithium in the tetramer
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,SeparationConnect1.08]Te[subscript 0.55]Se[subscriptsubstratesTheSOLTES simulator ofSTRATIFICATION EFFECTSDWARF
Self-Ordered stationary states of driven quantum degenerate gases in optical resonators
Raimar M. Sandner; Wolfgang Niedenzu; Francesco Piazza; Helmut Ritsch
2015-07-05T23:59:59.000Z
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.
LiNaK : multi-species apparatus for the study of ultracold quantum degenerate mixtures
Santiago González, Ibon
2012-01-01T23:59:59.000Z
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 ...
Ciliopathies : molecular and genetic basis for Ahi1 function in retinal degeneration
Louie, Carrie MC
2010-01-01T23:59:59.000Z
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
Phospholipase A2 inhibitors protect against prion and Abeta mediated synapse degeneration
Bate, Clive; Tayebi, Mourad; Williams, Alun
2010-04-08T23:59:59.000Z
's F12 con- taining 5% FCS, 0.35% glucose, 0.025% trypsin, and 0.1% type IV collagenase. After 30 minutes at 37°C, the cells were triturated again and the cell suspension was passed through a 100 ?M cell strainer. Cells were collected by centrifugation...
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
Britschgi, Markus; Takeda-Uchimura, Yoshiko; Rockenstein, Edward; Johns, Hudson; Masliah, Eliezer; Wyss-Coray, Tony
2012-01-01T23:59:59.000Z
et al. : Deficiency of terminal complement pathway inhibitorAccess Deficiency of terminal complement pathway inhibitoran inhibitor of the terminal complement pathway. Complement
Characterization of RPGR Variants and Their Role in Inherited Retinal Degeneration
Wright, Rachel
2012-10-19T23:59:59.000Z
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...
Level set simulations of turbulent thermonuclear deflagration in degenerate carbon and oxygen
Schmidt, W; Niemeyer, J C
2005-01-01T23:59:59.000Z
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 ...
Bürger, Raimund
: August 25, 2011. AUniversidad Nacional de Colombia, Department of Mathematics and Statistics, Manizales as entropy solutions. It is well known that certain monotone finite difference schemes converge, Colombia. E-Mail: cdacostam@unal.edu.co. BCI2MA and Departamento de Ingenier´ia Matem´atica, Facultad de
Bürger, Raimund
: October 18, 2011. AUniversidad Nacional de Colombia, Department of Mathematics and Statistics, Manizales as entropy solutions. It is well known that certain monotone finite difference schemes converge, Colombia. E-Mail: cdacostam@unal.edu.co. BCI2MA and Departamento de Ingenier´ia Matem´atica, Facultad de
Bürger, Raimund
Nacional de Colombia, Department of Mathematics and Statistics, Manizales, Colombia. E-Mail: cdacostam to be defined as entropy solutions. It is well known that certain monotone, and therefore first-order, finite
Bürger, Raimund
]. Date: July 3, 2011. AUniversidad Nacional de Colombia, Department of Mathematics and Statistics. The direct problem is solved herein by a version of a well-known explicit, monotone three-point finite, Manizales, Colombia. E-Mail: cdacostam@unal.edu.co. BCI2MA and Departamento de Ingenier´ia Matem
Data embedding employing degenerate clusters of data having differences less than noise value
Sanford, M.T. II; Handel, T.G.
1998-10-06T23:59:59.000Z
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.
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
Signs of the Degenerate Age: the Desecration of Chorten and Lhakhang in Bhutan
Whitecross, Richard W
2000-01-01T23:59:59.000Z
he stated “if evil is not suppressed, good will not prosper”.27 And yet, for all the strength of feeling displayed in these statements there were many who argued against the enforcement of Tha 1- 12. Several representatives stressed that as a Buddhist... . As mentioned above, many felt that the thieves were “dupes” in a game in which they were the losers. Nor was it lost on my informants that the level of chorten and lhakhang robberies has risen since the late 1970s. Although not articulated, there was a strong...
2015-01-01T23:59:59.000Z
imaging through adaptive optics. J Opt Soc Am A Opt Imageusing a confocal adaptive optics scanning ophthalmoscope.T, Campbell M. Adaptive optics scanning laser ophthalmosco-
Graciela Gelmini; Alexander Kusenko
1999-05-17T23:59:59.000Z
Relic neutrinos with mass 0.07 (+0.02/-0.04) eV, in the range consistent with Super-Kamiokande data, can explain the cosmic rays with energies in excess of the Greisen-Zatsepin-Kuzmin cutoff. The spectrum of ultra-high energy cosmic rays produced in this fashion has some distinctive features that may help identify their origin. Our mechanism does not require but is consistent with a neutrino density high enough to be a new kind of hot dark matter.
A Flexible Source of Non-Degenerate Entangled Photons Based on a Two-Crystal Sagnac Interferometer
Terence E. Stuart; Joshua A. Slater; Felix Bussieres; Wolfgang Tittel
2013-05-05T23:59:59.000Z
Sources of entangled photon pairs are a key component in both fundamental tests of quantum theory and practical applications such as quantum key distribution and quantum computing. In this work, we describe and characterize a source of polarization entangled photon pairs based on two spontaneous parametric down-conversion (SPDC) crystals in a Sagnac interferometer. Our source is compact and produces high-quality entangled states in a very flexible manner. The wavelengths of the photon pairs, around 810 and 1550 nm, the phase between orthogonal components of the entangled state, and the tangle of the state are all independently adjustable. In addition to presenting basic characterization data, we present experimental violations of CHSH and Leggett inequalities, as well as an instance of the "beautiful" Bell inequality, which has not previously been tested experimentally.
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
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
Dobrescu, Bogdan E.
2009-06-02T23:59:59.000Z
. The approach is based on evaluating real-time Green functions within the Keldysh- Schwinger formalism. The effects of quantum statistics associated with Pauli blocking for fermions and induced emission for bosons, characteristic of particle scattering in a...
Shore, S N; Wahlgren, G M
2011-01-01T23:59:59.000Z
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.
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 produced by each pixel, and thereby assessing the changes in the implant performance over time. Ó 2014
J. Farihi; E. E. Becklin; B. Zuckerman
2008-05-13T23:59:59.000Z
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.
CVS Caremark Specialty Pharmacy
degeneration · Multiple sclerosis · Oncology · Osteoarthritis · Osteoporosis · Psoriasis · Pulmonary arterial
Lenstra, Arjen K.
1 The JET Alfvén Eigenmode Local Manager for the real-time detection and tracking of a frequency,5 , A.Klein6 , P.Lavanchy1 , T.Panis1 , and JET-EFDA contributors JET-EFDA, Culham Science Centre, OX14, FR [3] Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, UK [4] formerly: JET Joint
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
2012-01-01T23:59:59.000Z
discs. Autologous PRP and PPP (platelet-poor plasma) werethe initial puncture, releasate isolated from clotted PPP orPRP (PPP- or PRP-releasate), or phosphate-buffered saline (
Quantum Opt. 2 (1990) 307-321. Printed in the UK The degenerate four-wave mixer:SU(1,l) symmetry and
Teich, Malvin C.
1990-01-01T23:59:59.000Z
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
D. Karakhanyan; Sh. Khachatryan
2009-08-27T23:59:59.000Z
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.
Jackson, David
production and photosynthetic rates within and outside a cyclonic mesoscale eddy in the North Pacific
E. M. Lipmanov
2008-10-01T23:59:59.000Z
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.
Wolfe, Patrick J.
to instability (single / double degenerate) · Thermonuclear Explosion: Deflagration/Detonation · Nickel to Cobalt
www.sciencemag.org SCIENCE VOL 300 2 MAY 2003 703 D E V E L O P M E N T
Gates, Kent. S.
on testicular devel- opment, degeneration, and infertility. -- LDC Development 130, 1029 (2003); Nature Genet
cooling of fermionic 6 Li in a thermal bath of bosonic 23 Na. The system features rapid thermalization, for sympathetic cooling of 6 Li. Our work provides the natural progression in t; published 4 April 2002) We have produced a macroscopic quantum system in which a 6 Li Fermi sea coexists
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
Stevens, Anna L. (Anna Lea)
2006-01-01T23:59:59.000Z
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, ...
Elucidation of Initiation and Maintenance Mechanisms of X Chromosome Inactivation
Minkovsky, Alissa
2013-01-01T23:59:59.000Z
A.L. , et al. (2012). Resveratrol ameliorates aging-relatedHIV-1 activity of resveratrol derivatives and synergistic1 by the combination of resveratrol and decitabine. Bioorg.
Just over 3,000 years ago at the time of the Yellow Emperor, the Chinese were the first
Olufsen, Mette Sofie
. His lungs begin to degenerate, he has cough in the winter time, but by his pulse you will know him
Wednesday, August 21, 2013 Biological Sciences Learning Center | Room 115
Issa, Naoum
the Correlation Mentor: Jacqueline Bernard, MD 9:20am Gabrielle Liu Retinal Nerve Fiber Layer and Macular Thinning Guided L5/S1 Placement of Labor Epidurals Does Not Improve Dermatomal Blockade in Parturients Mentor in Myelofibrosis Mentor: Olatoyosi Odenike, MD 11:30am Michael Ramirez Automated Segmentation of Sinus Mucosa
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
Wavelength-doubling optical parametric oscillator
Armstrong, Darrell J. (Albuquerque, NM); Smith, Arlee V. (Albuquerque, NM)
2007-07-24T23:59:59.000Z
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
2011-01-01T23:59:59.000Z
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.
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 ...
Exercise training modulates apoptotic signaling in the aging rat heart
Kwak, Hyo Bum
2005-11-01T23:59:59.000Z
Aging is characterized by a progressive decline in cardiac function. A critical contributor to the age-related impairment in heart function is the loss of cardiac myocytes through ??apoptosis??, or programmed cell death. A dramatic increase...
Jung, Sung Hoon
2009-06-02T23:59:59.000Z
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 ...
Behavioral impulsivity and hallucinations : insights from Parkinson's disease
Ashourian, Paymon
2011-01-01T23:59:59.000Z
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, ...
Tryptophan Cluster Protects Human ?D-Crystallin from Ultraviolet Radiation-Induced Photoaggregation
Schafheimer, Steven Nathaniel
Exposure to ultraviolet radiation (UVR) is a significant risk factor for age-related cataract, a disease of the human lens and the most prevalent cause of blindness in the world. Cataract pathology involves protein misfolding ...
Schafheimer, Steven Nathaniel
Ultraviolet radiation (UVR) exposure is a major risk factor for age-related cataract, a protein-aggregation disease of the human lens often involving the major proteins of the lens, the crystallins. ?D-Crystallin (H?D-Crys) ...
"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
Pannozzo, Mercede Alcina
2014-06-28T23:59:59.000Z
Hypertension has been associated with causing deleterious effects to the cerebrovasculature, which are thought to underlie the formation of white matter lesions (WML) and predispose individuals to age related cognitive ...
Establishing a rodent (Fischer 344 rat) model of mild cognitive impairment in aging
LaSarge, Candi Lynn
2009-05-15T23:59:59.000Z
characterized on the reference memory version of the water maze were tested on either a spatial working memory water maze task or an olfactory discrimination task. Despite detecting an age-related delay-dependent decline in spatial working memory...
Transforming growth factor alpha (TGFAlpha) in testicular development of the prepubertal boar
Gillespie, Joe Curtis
1993-01-01T23:59:59.000Z
used to characterize age-related changes in cell distribution and density of TGFA. The aspects of the proliferation of Leydig and Sertoli ceus and the presence of TGFA were determined by the inimunocytochemical and the morphometric analyses...
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
SirT1 regulates bone mass in vivo through regulation of osteoblast and osteoclast differentiation
Zainabadi, Kayvan
2009-01-01T23:59:59.000Z
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 ...
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 ...
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 ...
HEAT SHOCK PROTEINS: NOVEL THERAPEUTIC TARGETS AGAINST INSULIN RESISTANCE AND TYPE 2 DIABETES
Gupte, Anisha A.
2009-03-16T23:59:59.000Z
expression in the epitroclearis muscle?????????????????...?224 Figure 31. Resveratrol potentiates the effect of heat treatment on HSP72 expression?????????????????????..?229 LIST OF TABLES TABLE 1. Age-related changes in expression of HSPs...
Risk factors for cognitive decline in older people with type 2 diabetes
Feinkohl, Insa
2014-07-05T23:59:59.000Z
People with type 2 diabetes are at increased risk of age-related cognitive impairment. Previous literature has focused on case-control studies comparing rates of cognitive impairment in patients with and without diabetes. ...
Retinal microvascular abnormalities and cognitive function in older people with type 2 diabetes
Ding, Jie
2010-11-24T23:59:59.000Z
The deleterious effects of Type 2 diabetes on the brain have been shown to result in a greater prevalence of age-associated cognitive impairment and an enhanced risk of age-related cognitive decline in older diabetic ...
Modulating Peripersonal and Extrapersonal Reach Space: A Developmental Perspective
Cacola, Priscila Martins
2012-10-19T23:59:59.000Z
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- ...
Normal Aging and the Dissociable Prototype Learning Systems Brian D. Glass
Chittka, Lars
learning (Ashby & Mad- dox, 2005). Recent research suggests there is an age-related deficit in rule, Pacheco, Reeves, Zhu, & Schnyer, 2010, and see Filoteo & Mad- dox, 2004). Another important type
Exercise training modulates apoptotic signaling in the aging rat heart
Kwak, Hyo Bum
2005-11-01T23:59:59.000Z
Aging is characterized by a progressive decline in cardiac function. A critical contributor to the age-related impairment in heart function is the loss of cardiac myocytes through ??apoptosis??, or programmed cell death. A dramatic increase...
Fagan, Stephanie
2009-07-03T23:59:59.000Z
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 ...
Moreau, Kate L. (Kate Lauren)
2011-01-01T23:59:59.000Z
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 ...
Executive functions and dual-task ability in healthy ageing and in Parkinson's disease
Sanderson, Rebecca
2011-06-29T23:59:59.000Z
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 ...
Speed of processing versus dual-tasking in ageing using a motor-free paradigm.
Oliphant, Kirsty
2012-06-27T23:59:59.000Z
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 ...
Ghazali, Zayba
2011-06-29T23:59:59.000Z
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 ...
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
Evolving Metallurgical Behaviors in Plutonium from Self-Irradiation
Chung, B W; Lema, K E; Hiromoto, D S
2009-05-05T23:59:59.000Z
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.
On the Zariski closure of a germ of totally geodesic complex submanifold on a subvariety of a
Mok, Ngaiming
geometry is the Gauss map. Ein [Ei, 1982] proved that the Gauss map of a linearly non-degenerate projective-geometric terms, generic finiteness of the Gauss map on a lin- early non-degenerate projective submanifold W Pn. The projective second fundamental form is on the one hand by definition determined by the canonical projective
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
Karlsen, Kenneth Hvistendahl
, 137] have been constructed to describe the complex dynamics of reser- voir flow processes. A black-oil for the saturation equation, which is a convection dominated, degenerate convection-diffusion equation. Both theory for quasilinear degenerate parabolic equations, which provides the correct mathematical framework in which
Quantum versus classical descriptions of sub-Poissonian light generation in three-wave mixing
Jiri Bajer; Adam Miranowicz
2001-07-20T23:59:59.000Z
Sub-Poissonian light generation in the non-degenerate three-wave mixing is studied numerically and analytically within quantum and classical approaches. Husimi Q-functions and their classical trajectory simulations are analysed to reveal a special regime corresponding to the time-stable sub-Poissonian photocount statistics of the sum-frequency mode. Conditions for observation of this regime are discussed. Theoretical predictions of the Fano factor and explanation of the extraordinary stabilization of the sub-Poissonian photocount behavior are obtained analytically by applying the classical trajectories. Scaling laws for the maximum sub-Poissonian behavior are found. Noise suppression levels in the non-degenerate vs degenerate three-wave mixing are discussed on different time scales compared to the revival times. It is shown that the non-degenerate conversion offers much better stabilization of the suppressed noise in comparison to that of degenerate process.
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
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 ...
1999 Macmillan Magazines Ltd letters to nature
Coulson, Seana
. salina were ampli®ed by PCR using cDNAs as templates with degenerate primers to the regions conserved in both C. reinhardtii and A. thaliana CAO sequences. We obtained a CAO cDNA clone of D. salina
Experiments with interacting Bose and Fermi gases
Stan, Claudiu Andrei
2005-01-01T23:59:59.000Z
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 ...
A. V. Borisov; P. E. Sizin
2014-06-12T23:59:59.000Z
We calculate the neutrino luminosity of a degenerate electron gas in a strong magnetic field via plasmon decay to a neutrino pair due to neutrino electromagnetic moments and obtain the relative upper bounds on the effective neutrino magnetic moment.
Krock, Bryan L.
2010-07-14T23:59:59.000Z
trafficking. However, it was unclear whether photoreceptor degeneration in this disease is cell-autonomous, due to defective opsin transport within the photoreceptor, or is noncell-autonomous and a secondary consequence of defective RPE. Utilizing...
A collagen-GAG matrix for the growth of intervertebral disc tissue
Hastreiter, Dawn (Dawn Marie), 1973-
2002-01-01T23:59:59.000Z
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 ...
A collagen based scaffold for the repair of annulus fibrosus defects
Saad, Leonide C. (Leonide Camile), 1977-
2007-01-01T23:59:59.000Z
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 ...
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
Segregated Network Polymer-Carbon Nanotubes Composites For Thermoelectrics
Kim, Dasaroyong
2010-10-12T23:59:59.000Z
in polymer technology, particularly nanomaterial-polymer composites, can bring them into degenerate semiconductor or metallic regimes by incorporating a small amount of conductive filler. I demonstrate that such polymer nanocomposites can be viable for light...
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
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
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. ...
Proteoglycan 4 metabolism and boundary lubrication of articular cartilage
Schmidt, Tannin A.
2006-01-01T23:59:59.000Z
coupling processes is critical for understanding the dynamic processesdynamic processes of cartilage, such as growth, maturation, homeostasis, and degeneration, is elucidating at various levels of detail the chemomechanical coupling
Trotter's product formula for projections
Shvydkoy, Roman
-semigroup etB is replaced by the simplest of degenerate semigroups, i.e. a projection P L P denotes a bounded projection. Now, in (1) we replace the C0-semigroup etB by the continuous
Tunnel determinants from spectral zeta functions. Instanton effects in quantum mechanics
Izquierdo, A. Alonso [Departamento de Matematica Aplicada and IUFFyM, Universidad de Salamanca (Spain); Guilarte, J. Mateos [Departamento de Fisica Fundamental and IUFFyM, Universidad de Salamanca (Spain)
2014-07-23T23:59:59.000Z
In this paper we develop an spectral zeta function regularization procedure on the determinants of instanton fluctuation operators that describe the semi-classical order of tunnel effects between degenerate vacua.
Computational regulatory genomics : motifs, networks, and dynamics
Kheradpour, Pouya
2012-01-01T23:59:59.000Z
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 ...
RAPID COMMUNICATIONS PHYSICAL REVIEW A 82, 030501(R) (2010)
Blinov, Boris
2010-01-01T23:59:59.000Z
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
Buschmann, Michael
Bone Marrow Stimulation of the Medial Femoral Condyle Produces Inferior Cartilage and Bone Repair femoral condylar (MFC) versus femoral trochlear (TR) defects 3 months after bone marrow stimulation: cartilage repair; medial femoral condyle; trochlea; bone marrow stimulation; meniscus degeneration Articular
Kirkpatrick, Scott
. The publisher shall not be liable for any loss, actions, claims, proceedings, demand, or costs or damages to highly degenerate low-energy states and hysteretic dynamics, are quite similar to the opposing goals
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
When Stars Blow Up What Stars Explode?
Walter, Frederick M.
#12;GK Per = Nova Per 1901 #12;Novae Thermonuclear detonations on a white dwarf ·Hydrogen accumulates the temperature reaches a few MK, fusion begins ·Degenerate fusion is a runaway. ·All the H fuses to He
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 ...
Wan, Lu, Ph. D. Massachusetts Institute of Technology
2008-01-01T23:59:59.000Z
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 ...
Two-dimensional ultrafast pulse shaping and its application to coherent control and spectroscopy
Vaughan, Joshua Charles
2005-01-01T23:59:59.000Z
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 ...
Genetic factors influencing the peripheral nervous system in health and disease
Comley, Laura Helen
2011-11-25T23:59:59.000Z
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
2009-01-01T23:59:59.000Z
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 ...
Synaptic Mitochondrial Pathology in Alzheimer’s Disease
Du, Heng; Guo, Lan; Yan, Shirley ShiDu
2012-06-15T23:59:59.000Z
Significance: Synaptic degeneration, an early pathological feature in Alzheimer's disease (AD), is closely correlated to impaired cognitive function and memory loss. Recent studies suggest that involvement of amyloid-beta ...
A review of "Bodies, Politics and Transformations: John Donne’s Metempsychosis" by Siobhán Collins
Prescott, Anne Lake
2014-01-01T23:59:59.000Z
the Edenic apple’s soul through fifty-two stanzas (weeks?) of degeneration she offers a graduate course on Renaissance vegetables, animals, and human bodies, from the man- drake (a fine pair adorns the cover) to . . . ? Donne hints...
A New Type of Resonant Neutrino Conversions Induced by Magnetic Fields
S. Sahu; V. B. Semikoz; J. W. F. Valle
1995-12-21T23:59:59.000Z
We consider resonant neutrino conversions in magnetised matter, such as a degenerate electron gas. We show how magnetisation effects caused by axial vector interactions of neutrinos with the charged leptons in the medium can induce a new type of resonant neutrino conversion which may occur even in situations where the MSW effect does not occur, such as the case of degenerate or inverted neutrino mass spectra. Our new resonance may simultaneously affect anti-neutrino $\\bar{\
Proof of a Conjecture by Lewandowski and Thiemann
Christian Fleischhack
2003-04-01T23:59:59.000Z
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.
Diagrammatic Approach to Quantum Search
Thomas G. Wong
2015-02-09T23:59:59.000Z
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 $N$.
Two photon luminescence from quantum dots using broad and narrowband ultrafast laser pulses
Balasubramanian, Haribhaskar
2008-10-10T23:59:59.000Z
of transform limited broadband (~133nm, ~10fs) and narrowband (~11nm, ~170fs) pulses in the generation of two- photon luminescence from semiconductor nanocrystals or quantum dots (QD’s) both theoretically and experimentally. Compared to standard organic dyes..., QD’s possess a relatively broad, uniform spectral response that enables better use of the full bandwidth from the broadband laser. Theoretical calculations including both degenerate and non-degenerate TPE indicate a rolloff from the 1/? behavior...
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
de Magalhães, João Pedro
, neurodegenerative diseases, like Alzheimer's and Parkinson's disease, are among the major health concerns of aging of biology but it has a profound impact on medicine with age-related diseases like heart diseases, type II diabetes, cancer, and neurodegenerative diseases among the leading causes of death in modern societies
Alvarez, Pedro J.
AccessReview Medical bioremediation of age-related diseases Jacques M Mathieu*1, John Schloendorn2, Bruce homeostasis. Another alternative is "medical bioremediation," the use of microbial enzymes to augment missing insufficient catabolic functions [5]. Medical bioremediation can be considered as an extension of envi
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
COMPARISON OF OPTICAL COHERENCE TOMOGRAPHY IMAGING OF CATARACTS
Boppart, Stephen
of Texas, Austin, Texas; Radiofrequency Radiation Division, Armstrong Laboratory, Brooks AFB, Texas (Paper), with documented cataracts. These monkeys were exposed to several types of radiation during the mid and late 1960s. The radiation and age related cataracts in these animals were closely monitored using a unique grading system
Testing quantum-like models of judgment for question order effect
Thomas Boyer-Kassem; Sébastien Duchêne; Éric Guerci
2015-08-25T23:59:59.000Z
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.
Efficient all-optical production of large $^6$Li quantum gases using D$_1$ gray-molasses cooling
A. Burchianti; G. Valtolina; J. A. Seman; E. Pace; M. De Pas; M. Inguscio; M. Zaccanti; G. Roati
2014-06-18T23:59:59.000Z
We use a gray molasses operating on the D$_1$ atomic transition to produce degenerate quantum gases of $^{6}$Li with a large number of atoms. This sub-Doppler cooling phase allows us to lower the initial temperature of 10$^9$ atoms from 500 to 40 $\\mu$K in 2 ms. We observe that D$_1$ cooling remains effective into a high-intensity infrared dipole trap where two-state mixtures are evaporated to reach the degenerate regime. We produce molecular Bose-Einstein condensates of up to 5$\\times$10$^{5}$ molecules and weakly-interacting degenerate Fermi gases of $7\\times$10$^{5}$ atoms at $T/T_{F}<0.1$ with a typical experimental duty cycle of 11 seconds.
Two-dimensional cylindrical ion-acoustic solitary and rogue waves in ultrarelativistic plasmas
Ata-ur-Rahman [Institute of Physics and Electronics, University of Peshawar, Peshawar 25000 (Pakistan) [Institute of Physics and Electronics, University of Peshawar, Peshawar 25000 (Pakistan); National Centre for Physics at QAU Campus, Shahdrah Valley Road, Islamabad 44000 (Pakistan); Ali, S. [National Centre for Physics at QAU Campus, Shahdrah Valley Road, Islamabad 44000 (Pakistan)] [National Centre for Physics at QAU Campus, Shahdrah Valley Road, Islamabad 44000 (Pakistan); Moslem, W. M. [Department of Physics, Faculty of Science, Port Said University, Port Said 42521 (Egypt)] [Department of Physics, Faculty of Science, Port Said University, Port Said 42521 (Egypt); Mushtaq, A. [National Centre for Physics at QAU Campus, Shahdrah Valley Road, Islamabad 44000 (Pakistan) [National Centre for Physics at QAU Campus, Shahdrah Valley Road, Islamabad 44000 (Pakistan); Department of Physics, Abdul Wali Khan University, Mardan 23200 (Pakistan)
2013-07-15T23:59:59.000Z
The propagation of ion-acoustic (IA) solitary and rogue waves is investigated in a two-dimensional ultrarelativistic degenerate warm dense plasma. By using the reductive perturbation technique, the cylindrical Kadomtsev–Petviashvili (KP) equation is derived, which can be further transformed into a Korteweg–de Vries (KdV) equation. The latter admits a solitary wave solution. However, when the frequency of the carrier wave is much smaller than the ion plasma frequency, the KdV equation can be transferred to a nonlinear Schrödinger equation to study the nonlinear evolution of modulationally unstable modified IA wavepackets. The propagation characteristics of the IA solitary and rogue waves are strongly influenced by the variation of different plasma parameters in an ultrarelativistic degenerate dense plasma. The present results might be helpful to understand the nonlinear electrostatic excitations in astrophysical degenerate dense plasmas.
Electrostatic solitary ion waves in dense electron-positron-ion magnetoplasma
Jehan, Nusrat [Department of Physics, Theoretical Plasma Physics Group, Quaid-i-Azam University, Islamabad 45320 (Pakistan); Pakistan Atomic Energy Commission, P.O. Box 1114, Islamabad 44000 (Pakistan); Salahuddin, M. [Pakistan Atomic Energy Commission, P.O. Box 1114, Islamabad 44000 (Pakistan); Mahmood, S. [Theoretical Plasma Physics Division, PINSTECH, P.O. Nilore, Islamabad 44000 (Pakistan); Mirza, Arshad M. [Department of Physics, Theoretical Plasma Physics Group, Quaid-i-Azam University, Islamabad 45320 (Pakistan)
2009-04-15T23:59:59.000Z
The nonlinear coupled ion-acoustic and ion-cyclotron waves propagating obliquely to the external magnetic field in dense collisionless electron-positron-ion magnetoplasma are investigated using Sagdeev potential method. A semiclassical approach is used. Electrons and positrons are treated as degenerate Fermi gases described by Thomas-Fermi density distribution and ions behave as classical gas. It is found that the presence of degenerate positrons in a dense Thomas-Fermi plasma significantly modifies the structure of solitary waves by restricting the electrostatic potential to a certain maximum value which depends upon the concentration of positrons in the system. It is also noted that only subsonic humplike solitary waves can exist and for a given angle of propagation, the presence of degenerate positrons diminishes the amplitude as well as width of the solitary wave.
Axion emission from a magnetized neutron gas
Skobelev, V. V., E-mail: v.skobelev@inbox.ru [Moscow State Industrial University (Russian Federation)
2011-01-15T23:59:59.000Z
By using the polarization density matrix for a neutron in a magnetic field, the axion luminosity of magnetic neutron stars that is associated with the flip of the anomalous magnetic moment of degenerate nonrelativistic neutrons is calculated. It is shown that, at values of the magnetic-field induction in the region B Greater-Than-Or-Equivalent-To 10{sup 18} G, this mechanism of axion emission is dominant in 'young' neutron stars of temperature about a few tens of MeV units. At B {approx} 10{sup 17} G, it is one of the basic mechanisms. The Fermi energy of a degenerate neutron gas in a magnetic field is found, and it is shown that there is no such mechanism of axion emission in the degenerate case.
Modulation of drift-wave envelopes in a nonuniform quantum magnetoplasma
Misra, A. P., E-mail: apmisra@visva-bharati.ac.in, E-mail: apmisra@gmail.com [Department of Mathematics, Siksha Bhavana, Visva-Bharati University, Santiniketan-731 235, West Bengal (India)
2014-04-15T23:59:59.000Z
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.
Charged Vacuum Bubble Stability
J. R. Morris
1998-10-20T23:59:59.000Z
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.
What role does the third law of thermodynamics play in Szilard engines?
Kang-Hwan Kim; Sang Wook Kim
2011-12-14T23:59:59.000Z
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.
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
2006-09-04T23:59:59.000Z
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.
Method for resonant measurement
Rhodes, G.W.; Migliori, A.; Dixon, R.D.
1996-03-05T23:59:59.000Z
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)
2013-10-15T23:59:59.000Z
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.
Pion mass effects on axion emission from neutron stars through NN bremsstrahlung processes
S. Stoica; B. Pastrav; J. E. Horvath; M. P. Allen
2009-11-30T23:59:59.000Z
The rates of axion emission by nucleon-nucleon bremsstrahlung are calculated with the inclusion of the full momentum contribution from a nuclear one pion exchange (OPE) potential. The contributions of the neutron-neutron (nn), proton-proton (pp) and neutron-proton (np) processes in both the nondegenerate and degenerate limits are explicitly given. We find that the finite momentum corrections to the emissivities are quantitatively significant for the non-degenerate regime and temperature-dependent, and should affect the existing axion mass bounds. The trend of these nuclear effects is to diminish the emissivities.
A (P)HMC algorithm for N_f = 2 + 1 + 1 flavours of twisted mass fermions
T. Chiarappa; R. Frezzotti; C. Urbach
2005-09-27T23:59:59.000Z
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.
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
2007-12-07T23:59:59.000Z
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
Ray, S; Krishichayan,; Chakraborty, A; Mukhopadhyay, S; Ghugre, S S; Chintalapudi, S N; Sinha, A K; Garg, U; Zhu, S; Kharraja, B; Almehed, D
2007-01-01T23:59:59.000Z
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
High-resolution inverse Raman and resonant-wave-mixing spectroscopy
Rahn, L.A. [Sandia National Laboratories, Livermore, CA (United States)
1993-12-01T23:59:59.000Z
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).
Evolution of Static Physical Properties in Plutonium by Self-irradiation Damage
Chung, B W; Lema, K E; Hiromoto, D S
2010-04-13T23:59:59.000Z
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.
Nondestructive ultrasonic testing of materials
Hildebrand, B.P.
1994-08-02T23:59:59.000Z
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.
Nondestructive ultrasonic testing of materials
Hildebrand, Bernard P. (Richland, WA)
1994-01-01T23:59:59.000Z
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.
Some Considerations in Interviewing the Old, Old
Wingrove, C. Ray
1987-01-01T23:59:59.000Z
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...
LWR Sustainability: Assessment of Aging of Nuclear Power Plant Safety Related Concrete Strutures
Graves III, Herman [U.S. Nuclear Regulatory Commission; Naus, Dan J [ORNL
2013-01-01T23:59:59.000Z
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
2009-01-06T23:59:59.000Z
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.
Neutrinoless double beta decay
Petr Vogel
2006-11-17T23:59:59.000Z
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\
Amand Faessler; G. L. Fogli; E. Lisi; V. Rodin; A. M. Rotunno; F. Simkovic
2009-03-06T23:59:59.000Z
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.
Lotko, William
' revolution similar toTunisia and Egypt are not bright. There are no easy solutions,nor will outside pressure"union" with Russia,buttressed by its energy and financial subsidies,relationships with theWest further degenerated. A few years ago,Lukashenko began having public differences with Russia over the price of energy sold
Beyond Couch Potatoes: From Consumers to Designers Gerhard Fischer
Fischer, Gerhard
Beyond ÒCouch PotatoesÓ: From Consumers to Designers Gerhard Fischer Center for LifeLong Learning and behavior [44] and contributes to the degeneration of humans into Òcouch potatoes,Ó for whom a remote control is the most important instrument of their cognitive activities. (A Òcouch potatoÓ is a colloquial
Edinburgh, University of
cords, and the vocal cavities including the pharynx, mouth and nose. In the respiratory system, loss of elasticity [1], stiffening of the thorax, reduction in respiratory muscle strength [2] and loss and degeneration of intrinsic muscles [7] reduce the ease of vocal fold adjustments during phonation [8]. Increase
Cosmic Supernova Rate History and Type Ia Supernova Progenitors
Chiaki Kobayashi; Ken'ichi Nomoto; Takuji Tsujimoto
2001-02-14T23:59:59.000Z
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.
Symmetry Breaking in the Zero-Energy Landau Level in Bilayer Graphene P. Cadden-Zimansky,1,2
Kim, Philip
Symmetry Breaking in the Zero-Energy Landau Level in Bilayer Graphene Y. Zhao,1 P. Cadden, the eightfold degeneracy in the zero-energy Landau level is completely lifted, exhibiting new quantum Hall precisely at the particle-hole degenerate zero en- ergy. While the energy spacing of SLG LLs scales
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
Reaction-Diffusion systems for the macroscopic Bidomain model of the cardiac electric field
Veneroni, Marco
Reaction-Diffusion systems for the macroscopic Bidomain model of the cardiac electric field Marco Veneroni Abstract. The paper deals with a mathematical model for the electric activity of the heart the mathematical viewpoint the model is made up of a degenerate parabolic reaction diffusion system coupled
Thermal Density Functional Theory in Context Aurora Pribram-Jones,
Burke, Kieron
.3. Consequences 4 III.2.4. Extension to degenerate ground states 4 III.3. Kohn-Sham scheme 5 III.3.1. Exchange [1], and the various methods for modeling it are di- verse [2Â4]. The field includes enormous with useful accuracy. It is important to understand, from the outset, that the logic and methodology of KS
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
Observation of the memory steps in graphene at elevated temperatures Sergey L. Rumyantsev,1,2
layers were sequentially deposited on graphene by the electron-beam evaporation to produce the drain and source contacts.8,9 The degenerately doped Si sub- strate acted as a back gate. The current-voltage I-V charac- teristics drain current versus gate voltage were measured using a semiconductor parameter
Observation of the Memory Steps in Graphene at Elevated Temperatures
were sequentially deposited on graphene by the electron-beam evaporation to produce the drain and source contacts.[8,9] The degenerately doped Si substrate acted as a back gate. The currentvoltage (I-V) characteristics (drain current versus gate voltage) were measured using a semiconductor parameter analyzer
Grossman, Lawrence
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
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
Andrew J. Long; Cecilia Lunardini; Eray Sabancilar
2014-11-12T23:59:59.000Z
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_\
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
Author's personal copy Neuroscience Letters 541 (2013) 116119
Caldwell, Guy
2013-01-01T23:59:59.000Z
, 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
2008-01-01T23:59:59.000Z
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
Incorporating WAAS Data Into an Ionospheric Model for Correcting Satellite Radar
Toews, Carl
at the Millstone Hill Satellite Tracking Radar. She currently holds a joint appointment with the Atmospheric corrections to radar measurements, incorporating data from a single receiver to generate TEC estimates that the GRIMS ionospheric model degenerates during times of sharp spatial TEC gradients, e.g. during geomagnetic
THE CURVE OF "PRYM CANONICAL" GAUSS DIVISORS ON A PRYM THETA DIVISOR
Smith, Roy
THE CURVE OF "PRYM CANONICAL" GAUSS DIVISORS ON A PRYM THETA DIVISOR Roy Smith and Robert Varley variety (A, ) requires a knowledge of properties of its canonical linear system, the Gauss linear system of the branch divisor of the associated Gauss map on , is not a hypersurface as expected but a non degenerate
Combinatorial cohomology of the space of long knots Arnaud Mortier
Boyer, Edmond
are endowed with explicit co-orientations, that are canonical in some sense. The combinatorial tools involved in the space of knots, provided that these discs are correctly oriented. This property canonically defines a co-orientation of simple strata. Simple strata are represented by means of degenerated Gauss diagrams, i.e., whose arrows
fur Mathematik in den Naturwissenschaften
Automorphic Forms by Guy Buss Preprint no.: 72 2009 #12;#12;FAMILIES OF LINE BUNDLES OVER RIEMANN SURFACES, THEIR SECTIONS, AND THEIR DEGENERATIONS Â A CONSTRUCTIVE APPROACH USING AUTOMORPHIC FORMS GUY BUSS Abstract: December 9, 2009. 1 #12;2 GUY BUSS 6.1. Fibre Spaces over Augmented TeichmÂ¨uller Space 53 6.2. Continuous
MAGNETIC WELLS IN DIMENSION THREE B. HELFFER, Y. KORDYUKOV, N. RAYMOND, AND S. V~U NGO. C
of "magnetic bottle", or quantum confinement by a pure magnetic field, and has important applications of magnetic confinement. Us- ing generic assumptions on the geometry of the confinement, we exhibit three normal forms Ã la Birkhoff. As a consequence, when the magnetic field admits a unique and non degenerate
Markmann, Andreas
and pentatetraene. Our aim is to simulate dynamically the charge transfer process when one component is artificiallyAllene and pentatetraene cations as models for intramolecular charge transfer: Vibronic coupling online 13 April 2005 We consider the vibronic coupling effects involving cationic states with degenerate
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
Pulfrey, David L.
ELEC 576 Semiconductor Theory for Device Applications Fall 2005 Instructor: Dr. D.L. Pulfrey, Room the understanding of modern electronic semiconductor devices and the invention or development of new devices. Topics. Semiconductor statistics; low temperatures, degenerate. 4. Tunneling; heterostructures, S-D limitation to MOS
REFEREED JOURNAL PUBLICATIONS IN THE OPEN LITERATURE (331 articles): Google Scholar Profile
Hou, Y. Thomas
., Soyster, A. L., Murphy, F. H. and Sen, S. Linear Programming Based Analysis of Marginal Cost Pricing. d. Bazaraa, M. S. and Sherali, H. D. A Property of Degenerate Pivots for Linear Assignment Networks-381, 1978. b. Bazaraa, M. S. and Sherali, H. D. New Approaches for Solving the Quadratic Assignment Problem
Craig Kallendorf, et al
2002-01-01T23:59:59.000Z
?s encyclopedia along with an optimism derived from Quintilian, Diodorus Siculus, Vitruvius, and Virgil, so that he sees the present now as a degeneration from a better, purer past, then as the fruit of progress and maturation. He never developed a...
TRANSITION TEMPERATURE IN QCD WITH PHYSICAL LIGHT AND STRANGE QUARK MASSES.
KARSCH, F.
2006-11-14T23:59:59.000Z
We present results from a calculation of the transition temperature in QCD with two light (up, down) and one heavier (strange) quark mass as well as for QCD with three degenerate quark masses. Furthermore, we discuss first results from an ongoing calculation of the QCD equation of state with almost realistic light and strange quark masses.
Nabben, Reinhard
Belgrade, Serbia Received 31 October 2006; revised manuscript received 21 February 2007; published 1 May-ph for the radial breathing mode and up to 50 cm-1 difference for the high-energy mode frequency. DOI: 10.1103/Phys measurements are the high-energy modes HEMs around 1600 cm-1 , which correspond to the two doubly degenerated
Coherent spinor dynamics in a spin-1 Bose condensate
Loss, Daniel
, for example, a BoseEinstein condensate or a degenerate Fermi gas, the phase space accessible to low temperature. A hallmark of BoseEinstein condensation is the coherence between particles--every particle shares the same quantum wavefunction and phase. Although textbook discussions of BoseEinstein
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
Asymptotic analysis of the EPRL four-simplex amplitude
John W. Barrett; R. J. Dowdall; Winston J. Fairbairn; Henrique Gomes; Frank Hellmann
2009-04-20T23:59:59.000Z
The semiclassical limit of a 4-simplex amplitude for a spin foam quantum gravity model with an Immirzi parameter is studied. If the boundary state represents a non-degenerate 4-simplex geometry, the asymptotic formula contains the Regge action for general relativity. A canonical choice of phase for the boundary state is introduced and is shown to be necessary to obtain the results.
Osterloh, Frank
-earth niobate and tantalate (RE-Nb/Ta) materials are of considerable interest in environ- mental and energy, 47314737 4731 DOI:10.1021/cm9020645 Unique LaTaO4 Polymorph for Multiple Energy Applications May Nyman degeneration and H2 generation, chemically robust hosts for nuclear materials and wastes, and ion conductors
Stroud, Carlos R.
four-wave mixing in a three-level V system, electromagnetically induced transparency and optical. A Burleigh WA4500 wavemeter monitors the wavelengths of the fields. The pump and probe fi-degenerate four-wave mixing and saturation in a two-level system, difference-frequency crossing and nondegenerate
15 December 1998 Z .Optics Communications 158 1998 273286
Shahriar, Selim
system yields strong suppression of quantum phase noise when the probe and conjugate beams are monitored states of the electromagnetic field where the shot noise resulting .from the Heisenberg uncertainty of squeezed states and twin beams via non-degenerate four-wave mixing in a L system M.S. Shahriar a,) , P
A CONVERGENT ADAPTIVE FINITE ELEMENT METHOD FOR AN OPTIMAL DESIGN PROBLEM
Bartels, Soeren
of given geometry and unknown distribution of two materials of prescribed amounts is one model example in topology optimisation. It eventually leads to a degenerated convex minimisation problem. The numerical to refine everywhere. Its convergence proof is therefore based on energy estimates and some refined
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
COMMUNICATIONS IN COMPUTATIONAL PHYSICS Vol. 6, No. 1, pp. 49-71
for the mass and momentum, with Darcy's drag as an additional source term in momentum for flows through GDL, and a discontinuous and degenerate convection- diffusion equation for water concentration. Based on the mixed finite element method for the modified Navier-Stokes equation and standard finite element method for wa- ter
Paris-Sud XI, Université de
, 25]. The governing equations generally consist of an elliptic Darcy-type equation for the pressure to cope with degeneracies in the saturation equation and with media het- erogeneities. The proposed method and a nonlinear degenerate parabolic equation with a nonlinear advective term for the saturation. The dependent
EINDHOVEN UNIVERSITY OF TECHNOLOGY Department of Mathematics and Computer Science
Eindhoven, Technische Universiteit
in [0,1]. Equation (1.1) results by coupling the mass conservation equations and Darcy laws-01 January 2010 Travelling wave solutions for degenerate pseudo-parabolic equation modelling two-phase flow pseudo-parabolic equation modelling two-phase flow in porous media C.J.van Duijn, Y.Fan, L.A.Peletier, I
DARCY'S FLOW WITH PRESCRIBED CONTACT ANGLE WELL-POSEDNESS AND LUBRICATION APPROXIMATION
DARCY'S FLOW WITH PRESCRIBED CONTACT ANGLE Â WELL-POSEDNESS AND LUBRICATION APPROXIMATION HANS KN on a solid sub- strate. We use a model for viscous fluids where evolution is governed by Darcy's Law converge to the solutions of a one-dimensional degenerate parabolic fourth order equation which belongs
WELL-POSEDNESS AND UNIFORM BOUNDS FOR A NONLOCAL THIRD ORDER EVOLUTION OPERATOR ON AN
governed by Darcy's Law. After linearization, we obtain a nonlocal third order operator which contains for this linear evolution equation. In the limit of vanishing opening angle, we show the convergence of solutions to a fourth order degenerate parabolic operator, related to the thin-film equation. In the course
A ROBUST FINITE ELEMENT METHOD FOR DARCY--STOKES FLOW
Winther, Ragnar
. When # = 0 the first equation in (1.1) has the form of Darcy's law for flow in a homogeneous porousA ROBUST FINITE ELEMENT METHOD FOR DARCY--STOKES FLOW KENT ANDRE MARDAL, XUE--CHENG TAI, AND RAGNAR the perturbation parameter is large, while it degenerates to a mixed formulation of Poisson's equation
NUMERICAL SOLUTION OF RESERVOIR FLOW MODELS BASED ON LARGE TIME STEP OPERATOR SPLITTING ALGORITHMS
processes. A black-oil model is commonly used to describe water injection. This model works well. Special focus is posed on the numerical solution algorithms for the saturation equation, which is a convection dominated, degenerate convection-di#11;usion equation. Both theory and applications are discussed
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
Ramsay, Gavin
January; in original form 7 November 2000 ABSTRACT Using the Rossi X-ray Timing Explorer and the Nordic into the system, which is most likely evolved, par- tially degenerate and hydrogen depleted (Nelson, Rap- paport contribution from each of two components (point-like blackbody and more spatially extended cut-o#11; power law
Martin, Jan M.L.
for the doubly degenerate modes, together with tabulated vector coupling coefficients. The extraction-voltage applications, and as an etching gas in the semiconductor industry.1 The formation of CF4¯O2 adducts of these molecules. For these reasons the vibrational spec- troscopy of the above molecules has been the subject
Thermoelectric power factor enhancement by ionized nanoparticle scattering Je-Hyeong Bahk,1,a)
Thermoelectric power factor enhancement by ionized nanoparticle scattering Je-Hyeong Bahk,1,a theoretically that the thermoelectric power factor can be enhanced in degenerate semiconductors when embedded intact. We find that the thermoelectric power factor of In0.53Ga0.47As from 300 K to 800 K is enhanced
Uniqueness Theorem for Stationary Axisymmetric Black Holes in Einstein-Maxwell-axion-dilaton Gravity
Marek Rogatko
2010-07-26T23:59:59.000Z
We prove the uniqueness theorem for stationary axisymmetric black hole solution in Einstein-Maxwell-axion-dilaton gravity being the low-energy limit of the heterotic string theory. We consider both non-degenerate and extremal Kerr-Sen black hole solutions.
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
Small entries of neutrino mass matrices
E. Kh. Akhmedov
1999-09-15T23:59:59.000Z
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 $\
John Bulava; Philip Gerhold; Karl Jansen; Jim Kallarackal; Attila Nagy
2011-11-11T23:59:59.000Z
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.
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
A low power, high dynamic-range, broadband variable gain amplifier for an ultra wideband receiver
Chen, Lin
2007-09-17T23:59:59.000Z
rd-order intercept point (IIP3) is above -13.6dBm for 1Vpp differential input and output voltages. These low distortion broadband features benefit from the large linear range of the differential pair with source degeneration and the low impedance...
Sensitive HPV detection in oropharyngeal cancers
Winder, David M.; Ball, Siolian L. R.; Vaughan, Katie; Hanna, Nashat; Woo, Yin Ling; Franzer, Jurgen-Theodor; Sterling, Jane C.; Stanley, Margaret A.; Sudhoff, Holger H.; Goon, Peter K. C.
2009-12-15T23:59:59.000Z
reaction with degenerate general primers in a population-based study of human papillomavirus infec- tion in young Swedish women. Journal of clinical microbiology 1992, 30(4):987-992. 21. Manos MM, Ting Y, Wright DK, Lewis AJ, Broker TR, Wolinsky SM: Use...
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
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
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
SU4228472 Simpson's Neutrino and the Singular SeeSaw
Allen, Theodore J.
Burjassot, Valâ??encia, Spain Abstract We derive explicit forms for the neutrino and lepton ``mixingÂmatrices ``natural'') massive neutrino in gauge theories is of the twoÂcomponent ``Majorana'' type, it becomes Majorana neutrinos whose contributions cancel each other. If the two are degenerate, or nearly so, they e
Design of CMOS integrated frequency synthesizers for ultra-wideband wireless communications systems
Tong, Haitao
2009-05-15T23:59:59.000Z
on the capacitive source degeneration structure. The QVCO tackles the jeopardous ambiguity of the oscillation frequency in conventional QVCOs. Measurement shows that the 5¬GHz CSD¬QVCO in 0.18 µm CMOS technology draws 5.2 mA current from a 1.2 V power supply. Its...
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
Singlet Free Energies of a Static Quark-Antiquark Pair
Konstantin Petrov
2004-09-01T23:59:59.000Z
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.
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 ...
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
2015-01-01T23:59:59.000Z
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.
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)
2013-12-01T23:59:59.000Z
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.
The Majorana Project: A Next-Generation Double-Beta Decay Experiment
Gehman, Victor M. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); University of Washington, Seattle, WA 98195 (United States)
2006-07-11T23:59:59.000Z
The Majorana Project will endeavor to provide direct limits on the effective Majorana mass of the electron neutrino through the measurement of 0{nu}{beta}{beta} decay in 76Ge. Our goal is an experiment with a scalable sensitivity starting at 100 meV (corresponding to the quasi-degenerate mass scale) and ultimately extending well below that level. The current Majorana design consists of several modules, each a close-packed array of 57 Ge detectors, enriched to 86% in 76Ge, in a single cryostat. The ultimate background goal for Majorana is of order one count per tonne of Ge per year in the four keV region of interest around Q{beta}{beta}. This background will allow us to reach an effective Majorana-neutrino mass sensitivity approximately five times better than current results and should cover the quasi-degenerate mass scale.
Holographic fluids with perturbations of pressure and energy density at finite cutoff surface
Ya-Peng Hu; Yu Tian; Xiao-Ning Wu; Hongsheng Zhang
2015-07-30T23:59:59.000Z
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
2015-02-25T23:59:59.000Z
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.
Speed-up of combustion fronts in shear flows
Hamel, Francois
2011-01-01T23:59:59.000Z
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.
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)
2013-09-10T23:59:59.000Z
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.
THE ELM SURVEY. V. MERGING MASSIVE WHITE DWARF BINARIES
Brown, Warren R.; Kenyon, Scott J. [Smithsonian Astrophysical Observatory, 60 Garden St, Cambridge, MA 02138 (United States); Kilic, Mukremin; Gianninas, A. [Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, 440 W. Brooks St., Norman, OK, 73019 (United States); Allende Prieto, Carlos, E-mail: wbrown@cfa.harvard.edu, E-mail: skenyon@cfa.harvard.edu, E-mail: kilic@ou.edu, E-mail: alexg@nhn.ou.edu, E-mail: callende@iac.es [Instituto de Astrofisica de Canarias, E-38205, La Laguna, Tenerife (Spain)
2013-05-20T23:59:59.000Z
We present the discovery of 17 low-mass white dwarfs (WDs) in short-period (P {<=} 1 day) binaries. Our sample includes four objects with remarkable log g {approx_equal} 5 surface gravities and orbital solutions that require them to be double degenerate binaries. All of the lowest surface gravity WDs have metal lines in their spectra implying long gravitational settling times or ongoing accretion. Notably, six of the WDs in our sample have binary merger times <10 Gyr. Four have {approx}>0.9 M{sub Sun} companions. If the companions are massive WDs, these four binaries will evolve into stable mass transfer AM CVn systems and possibly explode as underluminous supernovae. If the companions are neutron stars, then these may be millisecond pulsar binaries. These discoveries increase the number of detached, double degenerate binaries in the ELM Survey to 54; 31 of these binaries will merge within a Hubble time.
Multiple-channel generalization of Lellouch-Lüscher formula: Lattice 2012 conference proceedings
Maxwell T. Hansen; Stephen R. Sharpe
2012-11-02T23:59:59.000Z
We describe a generalization of the Lellouch-L\\"uscher formula to the case of multiple strongly-coupled decay channels. As in the original formula, our final result is a relation between weak matrix elements in finite and infinite volumes. Our extension is limited to final states with two scalar particles, with center of mass energies below the lowest three- or four-particle threshold. Otherwise the extension is general, accommodating any number of channels, arbitrary strong coupling between channels, as well as any form of weak decay operators in the matrix elements. Among many possible applications, we emphasize that this is a necessary first step on the way to a lattice-QCD calculation of weak decay rates for D -> pi pi and D -> K K-bar. Our results allow for arbitrary total momentum and hold for degenerate or non-degenerate particles.
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)
2013-07-15T23:59:59.000Z
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.
Electron conduction along quantizing magnetic fields in neutron star crusts. II. Practical formulae
A. Y. Potekhin; D. G. Yakovlev
1997-07-18T23:59:59.000Z
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.
Nengji Zhou; Lipeng Chen; Yang Zhao; Dima Mozyrsky; Vladimir Chernyak; Yang Zhao
2014-11-01T23:59:59.000Z
By employing the variational approach, density matrix renormalization group (DMRG), exact diagonalization as well as symmetry and mean-field analyses, the ground state properties of the two-bath spin boson model with simultaneous diagonal and off-diagonal coupling are systematically studied in the sub-Ohmic regime. A novel quantum phase transition from a doubly degenerate "localized phase" to the other doubly degenerate "delocalized phase" is uncovered. Via the multi-D1 ansatz as the variational wave function, transition points are determined accurately, consistent with the results from DMRG and exact diagonalization. An effective spatial dimension $d_{eff} = 2.37(6)$ is then estimated, which is found to be compatible with the mean-field prediction. Furthermore, the quantum phase transition is inferred to be of first order for the baths described by a continuous spectral density function. In the case of single mode, however, the transition is softened.
Ab-initio Gorkov-Green's function calculations of open-shell nuclei
V. Soma; C. Barbieri; T. Duguet
2012-08-13T23:59:59.000Z
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.
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)
2008-02-15T23:59:59.000Z
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.
Effect of electron flow on the ordinary-extraordinary mode conversion
Jia Guozhang [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China); Gao Zhe [Department of Engineering Physics, Tsinghua University, Beijing 100084 (China) and Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031 (China)
2011-10-15T23:59:59.000Z
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.
Investigating texture six zero lepton mass matrices
Mahajan, Neelu; Gupta, Manmohan; Gill, P S
2013-01-01T23:59:59.000Z
All possible hermitian texture 6 zero Fritzsch like as well as non Fritzsch like lepton mass matrices (144 combinations in all) have been investigated for both Majorana and Dirac neutrinos for their compatibility with the current neutrino oscillation data, keeping in mind the hierarchy of neutrino masses. All the combinations considered here are ruled out by the existing data in the case of inverted hierarchy and degenerate scenario of Majorana neutrino masses. For Majorana neutrinos with normal hierarchy, we find that out of 144 combinations, only 16 possibilities can accommodate the experimental data. Assuming neutrinos to be Dirac particles, normal hierarchy, inverted hierarchy as well as degenerate neutrinos are ruled out for all the combinations.
Health monitoring method for composite materials
Watkins, Jr., Kenneth S. (Dahlonega, GA); Morris, Shelby J. (Hampton, VA)
2011-04-12T23:59:59.000Z
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.
Johnson, Denise Donna
1983-01-01T23:59:59.000Z
, trichophyton, and mumps, whereas, in other instances no decreases were noted except in elderly persons with acute illness (~Ka , 1979). There is an age- related decline in the proliferative capacity of humans or rodent T-cells t itogens a d tig s (~Ha11 e... key role in the inflammatory response after neutrophils have declined in numbers. It should be noted that both the monocytes and macrophages aid in the acute inflammatory response, but to a lesser degree than do the neutrophils. In chronic...
Aging management guideline for commercial nuclear power plants - heat exchangers
Booker, S.; Lehnert, D.; Daavettila, N.; Palop, E.
1994-06-01T23:59:59.000Z
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.
1984-05-01T23:59:59.000Z
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.
Mass Splitting of Staggered Fermion and $SO(2D)$ Clifford Algebra
M. Hatakeyama; H. Sawanaka; H. So
2006-09-28T23:59:59.000Z
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.
Superconductors with Topological Order
M. C. Diamantini; P. Sodano; C. A. Trugenberger
2005-11-18T23:59:59.000Z
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.
Faessler, Amand; Rodin, V. [Institute of Theoretical Physics, University of Tuebingen, 72076 Tuebingen (Germany); Fogli, G. L.; Rotunno, A. M. [Dipartimento Interateneo di Fisica 'Michelangelo Merlin', Via Amendola 173, 70126 Bari (Italy); Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Via Orabona 4, 70126 Bari (Italy); Lisi, E. [Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Via Orabona 4, 70126 Bari (Italy); Simkovic, F. [Institute of Theoretical Physics, University of Tuebingen, 72076 Tuebingen (Germany); Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna (Russian Federation); Department of Nuclear Physics, Comenius University, Mlynska dolina F1, SK-842 15 Bratislava (Slovakia)
2009-03-01T23:59:59.000Z
The variances and covariances associated to the nuclear matrix elements of neutrinoless double beta decay (0{nu}{beta}{beta}) are estimated within the quasiparticle random phase approximation. It is shown that correlated nuclear matrix elements uncertainties play an important role in the comparison of 0{nu}{beta}{beta} decay rates for different nuclei, and that they are degenerate with the uncertainty in the reconstructed Majorana neutrino mass.
Testosterone-induced phenotypic sex reversal in sheep
Stiles, Maxine Lorene
1979-01-01T23:59:59.000Z
(1970) also demonstrated that metabolic activity of the ovary begins only after differentiation of the ducts has taken place. Lillie's hormone theory inspired numerous investi- gations into the effects of steriod sex hormones on the reproductive... ? androgens to cause retention of the Wolffian system and a "Mullerian inhibitor" to cause degeneration of the female ducts. Antiandrogens have been extensively used to further explore the role that steriod sex hormones play in the difterentiation...
Borisov, A. V.; Kerimov, B. K.; Sizin, P. E., E-mail: borisov@phys.msu.ru [Moscow State University (Russian Federation)
2012-11-15T23:59:59.000Z
Expressions for the power of neutrino radiation from a degenerate electron gas in a strong magnetic field are derived for the case of neutrino-pair photoproduction via the weak and electromagnetic interaction mechanisms (it is assumed that the neutrino possesses electromagnetic form factors). It is shown that the neutrino luminosity of a medium in the electromagnetic reaction channel may exceed substantially the luminosity in the weak channel. Relative upper bounds on the effective neutrino magnetic moment are obtained.
A Small Molecule Modulator of Hsp90 Improves Experimental Diabetic Neuropathy
Urban, Michael Joseph
2010-07-30T23:59:59.000Z
of glycogen synthase. 25 In the absence of insulin, glycogen synthesis fails and gluconeogenesis pursues, releasing yet more glucose into the blood and increasing flux into the neurons. This extra release in glucose serves as a compensatory mechanism... gluconeogenesis. This increase in blood-glucose concentrations drives more glucose into the nerves, increasing metabolic flux via glucose metabolism, which contributes to neurotoxicity. The underlying causes behind insulin degeneration and insensitivity...
Holonomic Quantum Computing Based on the Stark Effect
Bernevig, B A
2004-01-01T23:59:59.000Z
We propose a spin manipulation technique based entirely on electric fields applied to acceptor states in $p$-type semiconductors with spin-orbit coupling. While interesting in its own right, the technique can also be used to implement fault-resilient holonomic quantum computing. We explicitly compute adiabatic transformation matrix (holonomy) of the degenerate states and comment on the feasibility of the scheme as an experimental technique.
Holonomic Quantum Computing Based on the Stark Effect
B. A. Bernevig; S. C. Zhang
2004-02-23T23:59:59.000Z
We propose a spin manipulation technique based entirely on electric fields applied to acceptor states in $p$-type semiconductors with spin-orbit coupling. While interesting in its own right, the technique can also be used to implement fault-resilient holonomic quantum computing. We explicitly compute adiabatic transformation matrix (holonomy) of the degenerate states and comment on the feasibility of the scheme as an experimental technique.
Four-Wave Mixing in Ultracold Atoms using Intermediate Rydberg States
E. Brekke; J. O. Day; T. G. Walker
2008-08-06T23:59:59.000Z
Ultracold Rb atoms were used to demonstrate non-degenerate four-wave mixing through a Rydberg state. Continuous 5S-5P-nD two-photon excitation to the Rydberg state was combined with an nD-6P tuned laser in a phase matched geometry. The angular dependence, spatial profile, and dependence on detuning were investigated, showing good agreement with theory. Under optimum conditions 50 percent of the radiation was emitted into the phase-matched direction.
JOURNAL DE PHYSIQUE CoZloque C6, suppldment au n012, Tome 42, de'cembre 1981 page C6-590
Boyer, Edmond
displace- ments of the sublattice k, respectively, The enrgy i s decoupled in- t o noninteracting parts curves i n t h e h direction can be clasified as: 2 A1 @ 2A2 8 4Aj with A being double degenerate mode projection operators/ i s introduced, vj (91 = 3[uj (ql) + u j (q22 , w .(q) = 1 J 7 [uj(s1) - Uj(92.g , 1 yj
Beam driven upper-hybrid-wave instability in quantized semiconductor plasmas
Jamil, M. [Department of Physics, COMSATS Institute of Information Technology, Lahore 54000 (Pakistan)] [Department of Physics, COMSATS Institute of Information Technology, Lahore 54000 (Pakistan); Rasheed, A. [Department of Physics, Government College University, Faisalabad 38000 (Pakistan)] [Department of Physics, Government College University, Faisalabad 38000 (Pakistan); Rozina, Ch. [Department of Physics, Government M.A.O. College, Lahore 54000 (Pakistan)] [Department of Physics, Government M.A.O. College, Lahore 54000 (Pakistan); Moslem, W. M. [Department of Physics, Faculty of Science, Port Said University, Port Said 42521 (Egypt) [Department of Physics, Faculty of Science, Port Said University, Port Said 42521 (Egypt); Centre for Theoretical Physics, The British University in Egypt (BUE), El-Shorouk City, Cairo (Egypt); Salimullah, M. [Department of Physics, Jahangirnagar University, Savar, Dhaka 1342 (Bangladesh)] [Department of Physics, Jahangirnagar University, Savar, Dhaka 1342 (Bangladesh)
2014-02-15T23:59:59.000Z
The excitation of Upper-Hybrid waves (UHWs) induced by electron beam in semiconductor plasma is examined using quantum hydrodynamic model. Various quantum effects are taken into account including recoil effect, Fermi degenerate pressure, and exchange-correlation potential. The bandwidth of the UHWs spectrum shows that the system supports purely growing unstable mode. The latter has been studied for diversified parameters of nano-sized GaAs semiconductor.
Acute monensin toxicosis in broiler chickens
Hanrahan, Lynn Allen
1979-01-01T23:59:59.000Z
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...
Spinors, matrix structures, and projective geometry in polarization optics
E. Ovsiyuk; O. Veko; M. Neagu; V. Balan; V. Red'kov
2014-10-31T23:59:59.000Z
The paper discusses the role played by Mueller and Jones formalisms in polarization optics, by addressing the following aspects: restriction to the SU(2) symmetry, non-relativistic Stokes 3-vectors; Cartan 2-spinors in polarization optics; Jones 4-spinors for partially polarized light; the linear group SL(4,R) and the classification of 1-parametric Mueller matrices; semi-group structure and classification of degenerate Mueller matrices.
Lepton Mass Hierarchy and Neutrino Oscillations
H. Fritzsch; Z. Z Xing
1995-09-26T23:59:59.000Z
Starting from the symmetry of lepton flavor democracy, we propose and discuss a simple pattern for the mass generation and flavor mixing of the charged leptons and neutrinos. The three neutrino masses are nearly degenerate, and the flavor mixing angles can be calculated. The observed deficit of solar and atmospheric neutrinos can be interpreted as a consequence of the near degeneracy and large oscillations of $\
Landau problem for bilayer graphene: Exact results
Young-Hwan Hyun; Yoonbai Kim; Corneliu Sochichiu; Min-Young Choi
2010-08-03T23:59:59.000Z
We consider graphene bilayer in a constant magnetic field of arbitrary orientation (i.e. tilted with respect to the graphene plane). In the low energy approximation to tight binding model with Peierls substitution, we find the exact spectrum of Landau levels. This spectrum is two-fold degenerate in the limit of large in-plane field, which gives rise to a new SU(2) symmetry in this limit.
Identifying Dark Matter Burners in the Galactic center
Igor V. Moskalenko; Lawrence L. Wai
2007-04-11T23:59:59.000Z
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.
Simulating the Haldane Phase in Trapped Ion Spins Using Optical Fields
I. Cohen; P. Richerme; Z. -X. Gong; C. Monroe; A. Retzker
2015-05-20T23:59:59.000Z
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.
Electron g-factor Engineering in III-V Semiconductors for Quantum Communications
Hideo Kosaka; Andrey A. Kiselev; Filipp A. Baron; Ki Wook Kim; Eli Yablonovitch
2001-02-22T23:59:59.000Z
An entanglement-preserving photo-detector converts photon polarization to electron spin. Up and down spin must respond equally to oppositely polarized photons, creating a requirement for degenerate spin energies, ge=0 for electrons. We present a plot of ge-factor versus lattice constant, analogous to bandgap versus lattice constant, that can be used for g-factor engineering of III-V alloys and quantum wells
The World of Dark Shadows Issue 31
Multiple Contributors
1982-01-01T23:59:59.000Z
; 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...
Type Ia Supernovae: Toward the Standard Model?
David Branch
2000-12-13T23:59:59.000Z
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.
On the hypermultiplet theories
Saidi, E.H. (Lab. of Theoretical Physics, Av. Ibn Batouta, P.O. Box 1014, Rabat (MA))
1988-01-01T23:59:59.000Z
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.
Galina Yermolenko
2002-01-01T23:59:59.000Z
?s Anthony and Cleopatra. Archer?s reading of Cleopatra as ?Egypt? invokes gender, sexual, and racial stereotypes, but does not show definitively that the play confirms the model of degeneration. The author argues that Egypt was reconstructed in early... Cleopatra as a wonderful piece of work (61) and that early modern English fantasy of Egyptian empire was not altogether unattractive. Hence, the author?s state- ments that Anthony and Cleopatra ?coincides? with the shift in repre- sentation of Egypt...
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)
2012-09-15T23:59:59.000Z
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.
Hydrodynamic equations for electrons in graphene obtained from the maximum entropy principle
Barletti, Luigi, E-mail: luigi.barletti@unifi.it [Dipartimento di Matematica e Informatica “Ulisse Dini”, Università degli Studi di Firenze, Viale Morgagni 67/A, 50134 Firenze (Italy)
2014-08-15T23:59:59.000Z
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.
Moon, Jaewoong
2009-05-15T23:59:59.000Z
.?????????????????????. 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...
Implications of theta_13 on Fritzsch-like lepton mass matrices
Fakay, Priyanka; Verma, Rohit; Ahuja, Gulsheen; Gupta, Manmohan
2013-01-01T23:59:59.000Z
Implications of the lepton mixing angles, in particular of theta_13, have been investigated for minimal as well as non-minimal Fritzsch-like textures for the case of Majorana neutrinos. Both, in minimal texture (texture 6 zero lepton mass matrices) and non-minimal textures (two cases of texture 5 zero lepton mass matrices), inverted hierarchy and degenerate scenario of neutrino masses have been ruled out. The implications of theta_13 have been investigated on the lightest neutrino mass m_\
Implications of theta_13 on Fritzsch-like lepton mass matrices
Priyanka Fakay; Samandeep Sharma; Rohit Verma; Gulsheen Ahuja; Manmohan Gupta
2013-01-25T23:59:59.000Z
Implications of the lepton mixing angles, in particular of theta_13, have been investigated for minimal as well as non-minimal Fritzsch-like textures for the case of Majorana neutrinos. Both, in minimal texture (texture 6 zero lepton mass matrices) and non-minimal textures (two cases of texture 5 zero lepton mass matrices), inverted hierarchy and degenerate scenario of neutrino masses have been ruled out. The implications of theta_13 have been investigated on the lightest neutrino mass m_\
Low-energy U(1) x USp(2M) gauge theory from simple high-energy gauge group
Sven Bjarke Gudnason; Kenichi Konishi
2010-05-17T23:59:59.000Z
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.
Asymptotic results for bifurcations in pure bending of rubber blocks
Coman, Ciprian; 10.1093/qjmam/hbn009
2008-01-01T23:59:59.000Z
The bifurcation of an incompressible neo-Hookean thick block with a ratio of thickness to length {eta}, subject to pure bending, is considered. The two incremental equilibrium equations corresponding to a nonlinear pre-buckling state of strain are reduced to a fourth-order linear eigenproblem that displays a multiple turning point. It is found that for 0 {infty} degenerates into a surface instability. Singular perturbation methods enable us to capture this transition, while direct numerical simulations corroborate the analytical results.
The Remarkable Deaths of 9 - 11 Solar Mass Stars
Woosley, S E
2015-01-01T23:59:59.000Z
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...
Optimal degeneracy for the signal-recycling cavity in advanced LIGO
Yi Pan
2006-08-29T23:59:59.000Z
As currently designed, the signal-recycling cavity (SRC) in the Advanced-LIGO interferometer is degenerate. In such a degenerate cavity, the phase fronts of optical fields become badly distorted when the mirror shapes are slightly deformed due to mirror figure error and/or thermal aberration, and this causes significant loss of the signal power and the signal-to-noise ratio (SNR) of a gravitational wave event. Through a numerical modal simulation of the optical fields in a simplified model of an Advanced-LIGO interferometer, We investigate the loss of the SNR and the behavior of both the carrier and signal optical fields, with the SRC at various levels of degeneracy. We show that the loss of the SNR is severe with a degenerate SRC, and a nondegenerate SRC can be used to solve this problem. We identify the optimal level of degeneracy for the SRC, which is achieved when the cavity Gouy phase is between 0.2 and 1.3 radians. We also discuss possible alternative designs of the SRC to achieve this optimal degeneracy.
Brick Walls for Black Holes in AdS/CFT
Norihiro Iizuka; Seiji Terashima
2015-01-01T23:59:59.000Z
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.
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)
2014-09-01T23:59:59.000Z
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.
Folding a protein with equal probability of being helix or hairpin
Chun-Yu Lin; Nan-Yow Chen; Chung-Yu Mou
2011-12-01T23:59:59.000Z
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.
Im, Myungshin; Yoon, Sung-Chul; Kim, Jae-Woo; Ehgamberdiev, Shuhrat A; Monard, Libert A G; Sung, Hyun-Il
2015-01-01T23:59:59.000Z
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...
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)
2014-05-14T23:59:59.000Z
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.
Kowalevski top in quantum mechanics
Matsuyama, A., E-mail: spamatu@ipc.shizuoka.ac.jp
2013-09-15T23:59:59.000Z
The quantum mechanical Kowalevski top is studied by the direct diagonalization of the Hamiltonian. The spectra show different behaviors depending on the region divided by the bifurcation sets of the classical invariant tori. Some of these spectra are nearly degenerate due to the multiplicity of the invariant tori. The Kowalevski top has several symmetries and symmetry quantum numbers can be assigned to the eigenstates. We have also carried out the semiclassical quantization of the Kowalevski top by the EBK formulation. It is found that the semiclassical spectra are close to the exact values, thus the eigenstates can be also labeled by the integer quantum numbers. The symmetries of the system are shown to have close relations with the semiclassical quantum numbers and the near-degeneracy of the spectra. -- Highlights: •Quantum spectra of the Kowalevski top are calculated. •Semiclassical quantization is carried out by the EBK formulation. •Quantum states are labeled by the semiclassical integer quantum numbers. •Multiplicity of the classical torus makes the spectra nearly degenerate. •Symmetries, quantum numbers and near-degenerate spectra are closely related.
Arinilhaq,; Widita, Rena [Department of Physics, Nuclear Physics and Biophysics Research Group, Institut Teknologi Bandung (Indonesia)
2014-09-30T23:59:59.000Z
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.
Williams, Paul T.
2006-01-06T23:59:59.000Z
Background: Body weight increases with aging. Short-term,longitudinal exercise training studies suggest that increasing exerciseproduces acute weight loss, but it is not clear if the maintenance oflong-term, vigorous exercise attenuates age-related weight gain inproportion to the exercise dose. Methods: Prospective study of 6,119 maleand 2,221 female runners whose running distance changed less than 5 km/wkbetween their baseline and follow-up survey 7 years later. Results: Onaverage, men who ran modest (0-24 km/wk), intermediate (24-48 km/wk) orprolonged distances (>_48 km/wk) all gained weight throughage 64,however, those who ran ?48 km/wk had one-half the average annual weightgain of those who ran<24 km/wk. Age-related weight gain, and itsreduction by running, were both greater in younger than older men. Incontrast, men s gain in waist circumference with age, and its reductionby running, were the same in older and younger men. Women increased theirbody weight and waist and hip circumferences over time, regardless ofage, which was also reduced in proportion to running distance. In bothsexes, running did not attenuate weight gain uniformly, but ratherdisproportionately prevented more extreme increases. Conclusion: Men andwomen who remain vigorously active gain less weight as they age and thereduction is in proportion to the exercise dose.
Diego Noja; Dmitry Pelinovsky; Gaukhar Shaikhova
2014-12-28T23:59:59.000Z
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.
A SEARCH FOR RAPIDLY ACCRETING WHITE DWARFS IN THE SMALL MAGELLANIC CLOUD
Lepo, Kelly; Van Kerkwijk, Marten, E-mail: lepo@astro.utoronto.ca, E-mail: mhvk@astro.utoronto.ca [Department of Astronomy and Astrophysics, University of Toronto, 50 Saint George St., Toronto, ON M5S 3H4 (Canada)
2013-07-01T23:59:59.000Z
The nature of the progenitors of Type Ia supernovae (SNe Ia) is still a mystery. While plausible candidates are known for both the single-degenerate and double-degenerate models, the observed numbers fall significantly short of what is required to reproduce the SNe Ia rate. Some of the most promising single-degenerate Type Ia progenitors are recurrent novae and super-soft sources (SSS). White dwarfs (WDs) with higher mass transfer rates can also be SN Ia progenitors. For these rapidly accreting white dwarfs (RAWDs), more material than is needed for steady burning accretes on the WD, and extends the WD's photosphere. Unlike SSS, such objects will likely not be detectable at soft X-ray energies, but will be bright at longer wavelengths, such as the far-ultraviolet (UV). Possible examples include LMC N66 and the V Sagittae stars. We present a survey using multi-object spectrographs looking for RAWDs in the central core of the Small Magellanic Cloud (SMC), from objects selected to be bright in the far-UV and with blue far UV - V colors. While we find some unusual objects, and recover known planetary nebula and Wolf-Rayet (WR) stars, we detect no candidate RAWD. The upper limits from this non-detection depend on our expectations of what an RAWD should look like, as well assumptions about the internal extinction of the SMC. Assuming they resemble LMC N66 or fainter versions of WR stars we set an upper limit of 10-14 RAWDs in the SMC. However, our survey is unlikely to detect objects like V Sge, and hence we cannot set meaningful upper limits if RAWDs generally resemble V Sge.
Zhukovskii, K.V.; Eminov, P.A. [Moscow State Inst. for Electronics and Mathematics (Russian Federation)
1995-11-01T23:59:59.000Z
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.
Nucleon electromagnetic form factors from twisted mass lattice QCD
Abdou Abdel-Rehim; Constantia Alexandrou; Martha Constantinou; Kyriakos Hadjiyiannakou; Karl Jansen; Giannis Koutsou
2015-01-07T23:59:59.000Z
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.
Collective Hamiltonian for chiral modes
Q. B. Chen; S. Q. Zhang; P. W. Zhao; R. V. Jolos; J. Meng
2013-02-23T23:59:59.000Z
A collective model is proposed to describe the chiral rotation and vibration and applied to a system with one $h_{11/2}$ proton particle and one $h_{11/2}$ neutron hole coupled to a triaxial rigid rotor. The collective Hamiltonian is constructed from the potential energy and mass parameter obtained in the tilted axis cranking approach. By diagonalizing the collective Hamiltonian with a box boundary condition, it is found that for the chiral rotation, the partner states become more degenerate with the increase of the cranking frequency, and for the chiral vibrations, their important roles for the collective excitation are revealed at the beginning of the chiral rotation region.
Energy Density of Vortices in the Schroedinger Picture
J. D. Laenge; M. Engelhardt; H. Reinhardt
2003-01-31T23:59:59.000Z
The one-loop energy density of an infinitely thin static magnetic vortex in SU(2) Yang-Mills theory is evaluated using the Schroedinger picture. Both the gluonic fluctuations as well as the quarks in the vortex background are included. The energy density of the magnetic vortex is discussed as a function of the magnetic flux. The center vortices correspond to local minima in the effective potential. These minima are degenerated with the perturbative vacuum if the fermions are ignored. Inclusion of fermions lifts this degeneracy, raising the vortex energy above the energy of the perturbative vacuum.
Power enhancement of heat engines via correlated thermalization in multilevel systems
David Gelbwaser-Klimovsky; Wolfgang Niedenzu; Paul Brumer; Gershon Kurizki
2014-11-05T23:59:59.000Z
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.
Electromagnetically induced absorption in metastable 83Kr atoms
Kale, Y B; Mishra, S R; Singh, S; Rawat, H S
2015-01-01T23:59:59.000Z
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.
Commutativity of Substitution and Variation in Actions of Quantum Field Theory
Zhong Chao Wu
2009-11-11T23:59:59.000Z
There exists a paradox in quantum field theory: substituting a field configuration which solves a subset of the field equations into the action and varying it is not necessarily equivalent to substituting that configuration into the remaining field equations. We take the $S^4$ and Freund-Rubin-like instantons as two examples to clarify the paradox. One must match the specialized configuration field variables with the corresponding boundary conditions by adding appropriate Legendre terms to the action. Some comments are made regarding exceptional degenerate cases.
A self-injected, diode-pumped, solid-state ring laser for laser cooling of Li atoms
Miake, Yudai; O'Hara, Kenneth M; Gensemer, Stephen
2015-01-01T23:59:59.000Z
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.
A partially quenched analysis of the eta-eta' system in N_f=2 QCD
Neff, H; Negele, John W; Schilling, K; Lippert, Th.
2004-01-01T23:59:59.000Z
We report on a first, comprehensive partially quenched study of the eta-eta' problem, based on SESAM configurations on a 16^3x32 lattice at beta=5.6 QCD with two (mass degenerate) active sea quark flavours. By means of the spectral approximation of the two-loop (hairpin) diagrams, we find clear plateau formation in the effective masses which enables us both to determine the eta-eta' mass matrix and the alpha-parameter in the effective chiral Lagrangian for the flavour singlet sector, alpha=0.028 +- 0.013.
Flavour Singlet Mesons in Full QCD on the Lattice
Schilling, K; Eicker, N; Lippert, T; Negele, J W; Lippert, Th.
2002-01-01T23:59:59.000Z
We apply spectral methods to compute the OZI-rule suppressed loop-loop correlators in the pseudoscalar meson flavour singlet channel. Using SESAM configurations (obtained with two degenerate sea quark flavours on 16x16x16x32 lattices at beta = 5.6 with standard Wilson action), we find for the first time clear evidence for mass plateau formation in the eta' channel of this theory. As a consequence, we observe a clear signal of a mass gap persistent under chiral extrapolation. This sets the stage for a more realistic two-channel approach, where partially quenched strange quarks would be included, in addition to u, d sea quarks.
Extended Conformal Symmetry and Recursion Formulae for Nekrasov Partition Function
Kanno, Shoichi; Zhang, Hong
2013-01-01T23:59:59.000Z
We derive an infinite set of recursion formulae for Nekrasov instanton partition function for linear quiver $U(N)$ supersymmetric gauge theories in 4D. They have a structure of a deformed version of ${\\mathcal{W}_{1+\\infty}}$ algebra which is called SH$^c$ algebra (or degenerate double affine Hecke algebra) in a literature. The algebra contains $W_N$ algebra with general central charge defined by a parameter $\\beta$, which gives the $\\Omega$ background in Nekrasov's analysis. Some parts of the formulae are identified with the conformal Ward identity for the conformal block function for Toda field theory.
Landau quantization and mass-radius relation of magnetized White Dwarfs in general relativity
Mukhopadhyay, Somnath; Basu, D N
2015-01-01T23:59:59.000Z
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.
Technical report on a long-wave unstable thin film equation with convection
Marina Chugunova; M. C. Pugh; R. M. Taranets
2009-10-27T23:59:59.000Z
In this technical report, we consider a nonlinear 4th-order degenerate parabolic partial differential equation that arises in modelling the dynamics of an incompressible thin liquid film on the outer surface of a rotating horizontal cylinder in the presence of gravity. The parameters involved determine a rich variety of qualitatively different flows. Depending on the initial data and the parameter values, we prove the existence of nonnegative periodic weak solutions. In addition, we prove that these solutions and their gradients cannot grow any faster than linearly in time; there cannot be a finite-time blow-up. Finally, we present numerical simulations of solutions.
Alternative large Nc baryons and holography
Carlos Hoyos-Badajoz; Andreas Karch
2009-06-24T23:59:59.000Z
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.
Non-standard neutrino interactions in the mu–tau sector
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Mocioiu, Irina; Wright, Warren
2015-04-01T23:59:59.000Z
We discuss neutrino mass hierarchy implications arising from the effects of non-standard neutrino interactions on muon rates in high statistics atmospheric neutrino oscillation experiments like IceCube DeepCore. We concentrate on the mu–tau sector, which is presently the least constrained. It is shown that the magnitude of the effects depends strongly on the sign of the ??? parameter describing this non-standard interaction. A simple analytic model is used to understand the parameter space where differences between the two signs are maximized. We discuss how this effect is partially degenerate with changing the neutrino mass hierarchy, as well as how this degeneracy could be lifted.
GaN directional couplers for integrated quantum photonics
Yanfeng Zhang; Loyd McKnight; Erman Engin; Ian M. Watson; Martin J. Cryan; Erdan Gu; Mark G. Thompson; Stephane Calvez; Jeremy L. O'Brien; Martin D. Dawson
2012-02-20T23:59:59.000Z
Large cross-section GaN waveguides are proposed as a suitable architecture to achieve integrated quantum photonic circuits. Directional couplers with this geometry have been designed with aid of the beam propagation method and fabricated using inductively coupled plasma etching. Scanning electron microscopy inspection shows high quality facets for end coupling and a well defined gap between rib pairs in the coupling region. Optical characterization at 800 nm shows single-mode operation and coupling-length-dependent splitting ratios. Two photon interference of degenerate photon pairs has been observed in the directional coupler by measurement of the Hong-Ou-Mandel dip with 96% visibility.
Goren, C.; Rosenbluh, M. [Department of Physics, Bar-Ilan University, Ramat Gan 52900 (Israel); Wilson-Gordon, A.D.; Friedmann, H. [Department of Chemistry, Bar-Ilan University, Ramat Gan 52900 (Israel)
2004-06-01T23:59:59.000Z
A method is presented for obtaining sub-Doppler and subnatural narrowing and increased absorption of a spectral line. The ultranarrow spectral line is confined between two closely spaced electromagnetically induced transparency windows in a nearly degenerate tripod atomic system formed by an F{sub g}=1{yields}F{sub e}=0 transition, split by a magnetic field. The system is driven by a {sigma}-polarized pump and probed by a tunable {pi}-polarized laser. It can be used to measure small magnetic fields and also as a magneto-optic switch.