Powered by Deep Web Technologies
Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

age-related macular degeneration: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

were conducted blind to risk genotypes and the results analyzed using univariate and multivariate (logistic regression) analysis. Results: IgG seropositivity to C. pneumoniae...

2

Systems-level analysis of age-related macular degeneration reveals global biomarkers and phenotype-specific functional networks  

E-Print Network [OSTI]

derived from Homo sapiens, an IPA Core Analysis was run forin the RPE-choroid interactome, we restricted IPA results tothe highest scoring IPA network for a given Core Analysis.

2012-01-01T23:59:59.000Z

3

Mitochondrial DNA haplogroups confer differences in risk for age-related macular degeneration: a case control study  

E-Print Network [OSTI]

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

4

Mitochondrial DNA Variants Mediate Energy Production and Expression Levels for CFH, C3 and EFEMP1 Genes: Implications for Age-Related Macular Degeneration  

E-Print Network [OSTI]

DNA Variants Mediate Energy Production and Expression Levelsmediate not only energy production and cell growth, but alsoDNA Variants Mediate Energy Production and Expression Levels

2013-01-01T23:59:59.000Z

5

E-Print Network 3.0 - abca4-associated retinal degenerations...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: , Retinitis Pigmentosa, Macular Degeneration, Photoreceptors, Optic Nerve, Photodiode http... Bionic Eyes Sub-Retinal Implants Michael Hutchins 12;Motivation ...

6

Original article Age-related changes in apparent digestibility  

E-Print Network [OSTI]

Original article Age-related changes in apparent digestibility in growing kittens E. Jean HARPER kitten to digest protein, fat, carbohydrate, dry-matter and energy were assessed. Kittens were divided access to food. Apparent digestibility of the two diets, and kitten bodyweights were measured over a 24

Paris-Sud XI, Université de

7

E-Print Network 3.0 - agees relation entre Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

agees relation entre Search Powered by Explorit Topic List Advanced Search Sample search results for: agees relation entre Page: << < 1 2 3 4 5 > >> 1 Introduction la programmation...

8

Degenerate Metric Phase Boundaries  

E-Print Network [OSTI]

The structure of boundaries between degenerate and nondegenerate solutions of Ashtekar's canonical reformulation of Einstein's equations is studied. Several examples are given of such "phase boundaries" in which the metric is degenerate on one side of a null hypersurface and non-degenerate on the other side. These include portions of flat space, Schwarzschild, and plane wave solutions joined to degenerate regions. In the last case, the wave collides with a planar phase boundary and continues on with the same curvature but degenerate triad, while the phase boundary continues in the opposite direction. We conjecture that degenerate phase boundaries are always null.

Ingemar Bengtsson; Ted Jacobson

1999-01-23T23:59:59.000Z

9

A microfabricated 3-D stem cell delivery scaffold for retinal regenerative therapy  

E-Print Network [OSTI]

Diseases affecting the retina, such as Age-related Macular Degeneration (AMD) and Retinitis Pigmentosa (RP), result in the degeneration of the photoreceptor cells and can ultimately lead to blindness in patients. There is ...

Sodha, Sonal

2009-01-01T23:59:59.000Z

10

E-Print Network 3.0 - agujero macular idiopatico Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

different symptoms, such as macular edema and optic neuritis... for that eye. Then, the process is repeated for the other eye. Patients suffering from macular ... Source:...

11

E-Print Network 3.0 - age-related human proportions Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Topic List Advanced Search Sample search results for: age-related human proportions Page: << < 1 2 3 4 5 > >> 1 Biogerontology 4: 119120, 2003. 2003 Kluwer Academic...

12

E-Print Network 3.0 - age related variations Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

by Explorit Topic List Advanced Search Sample search results for: age related variations Page: << < 1 2 3 4 5 > >> 1 Biogerontology 4: 119120, 2003. 2003 Kluwer Academic...

13

E-Print Network 3.0 - age related differences Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

by Explorit Topic List Advanced Search Sample search results for: age related differences Page: << < 1 2 3 4 5 > >> 1 Biogerontology 4: 119120, 2003. 2003 Kluwer Academic...

14

age-related myelin dynamics: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

age-related myelin dynamics First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Age related changes in...

15

Hydraulic limitation not declining nitrogen availability causes the age-related photosynthetic decline in loblolly  

E-Print Network [OSTI]

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

DeLucia, Evan H.

16

E-Print Network 3.0 - aging-related cognitive dysfunction Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

cognitive dysfunction Search Powered by Explorit Topic List Advanced Search Sample search results for: aging-related cognitive dysfunction Page: << < 1 2 3 4 5 > >> 1 In press in...

17

E-Print Network 3.0 - age related white Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

white Search Powered by Explorit Topic List Advanced Search Sample search results for: age related white Page: << < 1 2 3 4 5 > >> 1 The effects of healthcare provisions on the 4X...

18

E-Print Network 3.0 - age-related white matter Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

white matter Search Powered by Explorit Topic List Advanced Search Sample search results for: age-related white matter Page: << < 1 2 3 4 5 > >> 1 Assessing Early Brain Development...

19

E-Print Network 3.0 - age-related cardiac disease Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

3 4 5 > >> 1 Drosophila as a model for the identification of genes causing adult human heart disease Summary: on age-related changes (8, 9). Prior studies of adult Drosophila...

20

E-Print Network 3.0 - age-related cortical brain Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

brain Search Powered by Explorit Topic List Advanced Search Sample search results for: age-related cortical brain Page: << < 1 2 3 4 5 > >> 1 Mapping Cortical Thickness and Gray...

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Examining Age-Related Use of Visual Imagery Subprocesses in Children  

E-Print Network [OSTI]

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...

Oliver, Brittney

2011-08-08T23:59:59.000Z

22

E-Print Network 3.0 - age-related human small Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

by Explorit Topic List Advanced Search Sample search results for: age-related human small Page: << < 1 2 3 4 5 > >> 1 Biogerontology 4: 119120, 2003. 2003 Kluwer Academic...

23

E-Print Network 3.0 - aging-related barrier dysfunction Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2009 Bentham Science Publishers Ltd. Summary: , Thurston, G, Rochon-Duck, M, Le, T, Brekken, R, McDonald, DM. (2004) Age-related changes in vascular... response with...

24

Use Of Green Porphyrinsto Treat Neovasculature In The Eyes  

DOE Patents [OSTI]

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.

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

25

High Temperature Requirement Factor A1 (HTRA1) Gene Regulates Angiogenesis through Transforming Growth  

E-Print Network [OSTI]

Function in Animals, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan for AMD. Age-related macular degeneration (AMD)5 is the leading cause of blindness among elderly patients

26

Geometric phases for non-degenerate and degenerate mixed states  

E-Print Network [OSTI]

This paper focuses on the geometric phase of general mixed states under unitary evolution. Here we analyze both non-degenerate as well as degenerate states. Starting with the non-degenerate case, we show that the usual procedure of subtracting the dynamical phase from the total phase to yield the geometric phase for pure states, does not hold for mixed states. To this end, we furnish an expression for the geometric phase that is gauge invariant. The parallelity conditions are shown to be easily derivable from this expression. We also extend our formalism to states that exhibit degeneracies. Here with the holonomy taking on a non-abelian character, we provide an expression for the geometric phase that is manifestly gauge invariant. As in the case of the non-degenerate case, the form also displays the parallelity conditions clearly. Finally, we furnish explicit examples of the geometric phases for both the non-degenerate as well as degenerate mixed states.

K. Singh; D. M. Tong; K. Basu; J. L. Chen; J. F. Du

2003-04-10T23:59:59.000Z

27

age-related nuclear cataracts: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

age-related nuclear cataracts First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Electron tomography of...

28

age-related nuclear cataract: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

age-related nuclear cataract First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Electron tomography of...

29

Degenerate Extensions of General Relativity  

E-Print Network [OSTI]

General relativity has previously been extended to incorporate degenerate metrics using Ashtekar's hamiltonian formulation of the theory. In this letter, we show that a natural alternative choice for the form of the hamiltonian constraints leads to a theory which agrees with GR for non-degenerate metrics, but differs in the degenerate sector from Ashtekar's original degenerate extension. The Poisson bracket algebra of the alternative constraints closes in the non-degenerate sector, with structure functions that involve the {\\it inverse} of the spatial triad. Thus, the algebra does {\\it not} close in the degenerate sector. We find that it must be supplemented by an infinite number ofsecondary constraints, which are shown to be first class (although their explicit form is not worked out in detail). All of the constraints taken together are implied by, but do not imply, Ashtekar's original form of constraints. Thus, the alternative constraints give rise to a different degenerate extension of GR. In the corresponding quantum theory, the single loop and intersecting loop holonomy states found in the connection representation satisfy {\\it all} of the constraints. These states are therefore exact (formal) solutions to this alternative degenerate extension of quantum gravity, even though they are {\\it not} solutions to the usual vector constraint.

Ted Jacobson; Joseph D. Romano

1992-07-23T23:59:59.000Z

30

AGE-RELATED DEGRADATION OF NUCLEAR POWER PLANT STRUCTURES AND COMPONENTS.  

SciTech Connect (OSTI)

This paper summarizes and highlights the results of the initial phase of a research project on the assessment of aged and degraded structures and components important to the safe operation of nuclear power plants (NPPs). A review of age-related degradation of structures and passive components at NPPs was performed. Instances of age-related degradation have been collected and reviewed. Data were collected from plant generated documents such as Licensing Event Reports, NRC generic communications, NUREGs and industry reports. Applicable cases of degradation occurrences were reviewed and then entered into a computerized database. The results obtained from the review of degradation occurrences are summarized and discussed. Various trending analyses were performed to identify which structures and components are most affected, whether degradation occurrences are worsening, and what are the most common aging mechanisms. The paper also discusses potential aging issues and degradation-susceptible structures and passive components which would have the greatest impact on plant risk.

BRAVERMAN,J.

1999-03-29T23:59:59.000Z

31

Age-Related Degradation of Nuclear Power Plant Structures and Components  

SciTech Connect (OSTI)

This paper summarizes and highlights the results of the initial phase of a research project on the assessment of aged and degraded structures and components important to the safe operation of nuclear power plants (NPPs). A review of age-related degradation of structures and passive components at NPPs was performed. Instances of age-related degradation have been collected and reviewed. Data were collected from plant generated documents such as Licensing Event Reports, NRC generic communications, NUREGs and industry reports. Applicable cases of degradation occurrences were reviewed and then entered into a computerized database. The results obtained from the review of degradation occurrences are summarized and discussed. Various trending analyses were performed to identify which structures and components are most affected, whether degradation occurrences are worsening, and what was the most common aging mechanisms. The paper also discusses potential aging issues and degradation-susceptible structures and passive components which would have the greatest impact on plant risk.

Braverman, J.; Chang, T.-Y.; Chokshi, N.; Hofmayer, C.; Morante, R.; Shteyngart, S.

1999-03-29T23:59:59.000Z

32

Degenerate quantum gases of strontium  

E-Print Network [OSTI]

Degenerate quantum gases of alkaline-earth-like elements open new opportunities in research areas ranging from molecular physics to the study of strongly correlated systems. These experiments exploit the rich electronic structure of these elements, which is markedly different from the one of other species for which quantum degeneracy has been attained. Specifically, alkaline-earth-like atoms, such as strontium, feature metastable triplet states, narrow intercombination lines, and a non-magnetic, closed-shell ground state. This review covers the creation of quantum degenerate gases of strontium and the first experiments performed with this new system. It focuses on laser-cooling and evaporation schemes, which enable the creation of Bose-Einstein condensates and degenerate Fermi gases of all strontium isotopes, and shows how they are used for the investigation of optical Feshbach resonances, the study of degenerate gases loaded into an optical lattice, as well as the coherent creation of Sr_2 molecules.

Stellmer, Simon; Killian, Thomas C

2013-01-01T23:59:59.000Z

33

Reorganization of visual processing in macular degeneration: Replication and clues about the role of foveal loss q  

E-Print Network [OSTI]

- lowing loss of visual input as a result of optic radiation damage (Dilks, Serences, Rosenau, Yantis, & Mc

Baker, Chris I.

34

Reorganization of visual processing in macular degeneration: Replication and clues about the role of foveal loss q  

E-Print Network [OSTI]

study reported reorganization fol- lowing loss of visual input as a result of optic radiation damage

Kanwisher, Nancy

35

No age-related cell loss in three retinal nuclear layers of the Long-Evans rat  

E-Print Network [OSTI]

and photoreceptor cells which are distributed in the ganglion cell layer ~GCL!, inner nuclear layer ~INL! and outer. In this study, thus, we wanted to test whether there is an age-related cell loss in the GCL, INL and ONL to INL to GCL was preserved. Keywords: Cell number, Retina, Aging, Long-Evans rat, Stereological method

Zhou, Yi-Feng

36

Neuroscience Letters 366 (2004) 5862 Age-related effects of bilateral frontal eye fields lesions on rapid eye  

E-Print Network [OSTI]

Neuroscience Letters 366 (2004) 58­62 Age-related effects of bilateral frontal eye fields lesions on rapid eye movements during REM sleep in rhesus monkeys Shan Yua,b,1, Ning Liub,1, Tao Zengb,c, Shaohua Received 14 January 2004; received in revised form 7 April 2004; accepted 8 May 2004 Abstract Rapid eye

Zhou, Yi-Feng

37

A Monte Carlo algorithm for degenerate plasmas  

SciTech Connect (OSTI)

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.

Turrell, A.E., E-mail: a.turrell09@imperial.ac.uk; Sherlock, M.; Rose, S.J.

2013-09-15T23:59:59.000Z

38

Total absorption by degenerate critical coupling  

SciTech Connect (OSTI)

We consider a mirror-symmetric resonator with two ports. We show that, when excited from a single port, complete absorption can be achieved through critical coupling to degenerate resonances with opposite symmetry. Moreover, any time two resonances with opposite symmetry are degenerate in frequency and absorption is always significantly enhanced. In contrast, when two resonances with the same symmetry are nearly degenerate, there is no absorption enhancement. We numerically demonstrate these effects using a graphene monolayer on top of a photonic crystal slab, illuminated from a single side in the near-infrared.

Piper, Jessica R., E-mail: jrylan@stanford.edu; Liu, Victor; Fan, Shanhui, E-mail: shanhui@stanford.edu [Ginzton Laboratory, Department of Electrical Engineering, Stanford University, Stanford, California 94305 (United States)

2014-06-23T23:59:59.000Z

39

AGE-RELATED BRAIN CHOLINESTERASE INHIBITION KINETICS FOLLOWING IN VITRO INCUBATION WITH CHLORPYRIFOS-OXON AND DIAZINON-OXON  

SciTech Connect (OSTI)

Chlorpyrifos and diazinon are two commonly used organophosphorus (OP) insecticides, and their primary mechanism of action involves the inhibition of acetylcholinesterase (AChE) by their metabolites chlorpyrifos-oxon (CPO) and diazinon-oxon (DZO), respectively. The study objectives were to assess the in vitro age-related inhibition kinetics of neonatal rat brain cholinesterase (ChE) by estimating the bimolecular inhibitory rate constant (ki) values for CPO and DZO. Brain ChE inhibition and ki values following CPO and DZO incubation with neonatal Sprague-Dawley rats rat brain homogenates were determined at post natal day (PND) -5, -12 and -17 and compared with the corresponding inhibition and ki values obtained in the adult rat. A modified Ellman method was utilized for measuring the ChE activity. Chlorpyrifos-oxon resulted in greater ChE inhibition than DZO consistent with the estimated ki values of both compounds. Neonatal brain ChE inhibition kinetics exhibited a marked age-related sensitivity to CPO, where the order of ChE inhibition was PND-5 > PND-7 > PND-17 with ki values of 0.95, 0.50 and 0.22 nM-1hr-1, respectively. In contrast, DZO did not exhibit an age-related inhibition of neonatal brain ChE, and the estimated ki value at all PND ages was 0.02 nM-1hr-1. These results demonstrated an age- and chemical-related OP-selective inhibition of rat brain ChE which may be critically important in understanding the potential sensitivity of juvenile humans to specific OP exposures.

Kousba, Ahmed A.; Poet, Torka S.; Timchalk, Chuck

2007-01-01T23:59:59.000Z

40

Admissibility Conditions for Degenerate Cyclotomic BMW Algebras  

E-Print Network [OSTI]

We study admissibility conditions for the parameters of degenerate cyclotomic BMW algebras. We show that the u-admissibility condition of Ariki, Mathas and Rui is equivalent to a simple module theoretic condition.

Goodman, Frederick M

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

A new degenerate Fermi gas apparatus  

E-Print Network [OSTI]

In the summer of 2004, the BEC 2 lab of Wolfgang Ketterle's group at MIT started a new research direction of studying degenerate fermionic Lithium atoms in optical lattices. The major contributions to the new experimental ...

Setiawan, Widagdo

2007-01-01T23:59:59.000Z

42

The temporal trajectory of age-related decreases in executive function Doreen Nessler, Ray Johnson, Jr., Michael Bersick and David Friedman  

E-Print Network [OSTI]

The temporal trajectory of age-related decreases in executive function Doreen Nessler¹, Ray Johnson] Friedman, Nessler, Johnson, Ritter & Bersick, in revision. [3] Kray, Li & Lindenberger , 2002, Brain

Johnson Jr.,, Ray

43

Received: 24 July 2008, Accepted: 24 July 2008, Published online in Wiley InterScience: 2009 Engineered 5S ribosomal RNAs displaying  

E-Print Network [OSTI]

being incorporated into ribosomes and without obvious effects on the host cells. In this work, we selection from a very large pool of $1015 randomized polynucleotides which is narrowed down to one or a few, but plays an essential role in tumor growth and age-related macular degeneration (AMD). Pegaptanib sodium

Fox, George

44

Degenerate Quantum Codes for Pauli Channels  

E-Print Network [OSTI]

A striking feature of quantum error correcting codes is that they can sometimes be used to correct more errors than they can uniquely identify. Such degenerate codes have long been known, but have remained poorly understood. We provide a heuristic for designing degenerate quantum codes for high noise rates, which is applied to generate codes that can be used to communicate over almost any Pauli channel at rates that are impossible for a nondegenerate code. The gap between nondegenerate and degenerate code performance is quite large, in contrast to the tiny magnitude of the only previous demonstration of this effect. We also identify a channel for which none of our codes outperform the best nondegenerate code and show that it is nevertheless quite unlike any channel for which nondegenerate codes are known to be optimal.

Graeme Smith; John A. Smolin

2006-12-23T23:59:59.000Z

45

Identification and Assessment of Material Models for Age-Related Degradation of Structures and Passive Components in Nuclear Power Plants  

SciTech Connect (OSTI)

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.

Nie,J.; Braverman, J.; Hofmayer, C.; Kim, M. K.; Choi, I-K.

2009-04-27T23:59:59.000Z

46

Extremal Graph Problems, Degenerate Extremal Problems,  

E-Print Network [OSTI]

Extremal Graph Problems, Degenerate Extremal Problems, and Supersaturated Graphs Mikl´os Simonovits´an-type extremal problem. The graphs attaining the maximum will be called extremal and their family will be denoted and multi- ple edges. In 1940, P. Tur´an posed and solved the extremal problem of Kp+1, the complete graph

Simonovits, Miklós

47

Affine and degenerate affine BMW algebras: Actions on tensor space  

E-Print Network [OSTI]

Affine and degenerate affine BMW algebras: Actions on tensor space Zajj Daugherty Department Actions of classical type tantalizers 8 2.1 The degenerate affine BMW algebra action . . . . . . . . . . . . . . . . . . . . . 13 2.2 The affine BMW algebra action . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3

Ram, Arun

48

Age-Related Binding Deficits and the Content of False Memories Keith B. Lyle, Suzanne M. Bloise, and Marcia K. Johnson  

E-Print Network [OSTI]

, and Marcia K. Johnson Yale University The authors examined effects of age-related binding deficits on featureIntyre & Craik, 1987), and location (Chalfonte & Johnson, 1996; Light & Zelinski, 1983; Mitchell, Johnson, Raye with actually experi- enced events (e.g., Balota et al., 1999; Henkel, Johnson, & De Leonardis, 1998; Koutstaal

Johnson, Marcia K.

49

Can Neutrinos be Degenerate in Mass?  

E-Print Network [OSTI]

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.

John Ellis; Smaragda Lola

1999-04-13T23:59:59.000Z

50

Landau Diamagnetism of Degenerate Collisional Plasma  

E-Print Network [OSTI]

For the first time the kinetic description of Landau diamagnetism for degenerate collisional plasma is given. The correct expression for transverse electric conductivity of the quantum plasma, found by authors (see arXiv:1002.1017 [math-ph] 4 Feb 2010) is used. In work S. Dattagupta, A.M. Jayannavar and N. Kumar [Current science, V. 80, No. 7, 10 April, 2001] was discussed the important problem of dissipation (collisions) influence on Landau diamagnetism. The analysis of this problem is given with the use of exact expression for transverse conductivity of quantum plasma.

A. V. Latyshev; A. A. Yushkanov

2010-07-05T23:59:59.000Z

51

Affine and degenerate affine BMW algebras: Actions on tensor space  

E-Print Network [OSTI]

The affine and degenerate affine Birman-Murakami-Wenzl (BMW) algebras arise naturally in the context of Schur-Weyl duality for orthogonal and symplectic quantum groups and Lie algebras, respectively. Cyclotomic BMW algebras, affine and cyclotomic Hecke algebras, and their degenerate versions are quotients. In this paper we explain how the affine and degenerate affine BMW algebras are tantalizers (tensor power centralizer algebras) by defining actions of the affine braid group and the degenerate affine braid algebra on tensor space and showing that, in important cases, these actions induce actions of the affine and degenerate affine BMW algebras. We then exploit the connection to quantum groups and Lie algebras to determine universal parameters for the affine and degenerate affine BMW algebras. Finally, we show that the universal parameters are central elements--the higher Casimir elements for orthogonal and symplectic enveloping algebras and quantum groups.

Daugherty, Zajj; Virk, Rahbar

2012-01-01T23:59:59.000Z

52

Affine and degenerate affine BMW algebras: The center  

E-Print Network [OSTI]

The degenerate affine and affine BMW algebras arise naturally in the context of Schur-Weyl duality for orthogonal and symplectic Lie algebras and quantum groups, respectively. Cyclotomic BMW algebras, affine Hecke algebras, cyclotomic Hecke algebras, and their degenerate versions are quotients. In this paper the theory is unified by treating the orthogonal and symplectic cases simultaneously; we make an exact parallel between the degenerate affine and affine cases via a new algebra which takes the role of the affine braid group for the degenerate setting. A main result of this paper is an identification of the centers of the affine and degenerate affine BMW algebras in terms of rings of symmetric functions which satisfy a "cancellation property" or "wheel condition" (in the degenerate case, a reformulation of a result of Nazarov). Miraculously, these same rings also arise in Schubert calculus, as the cohomology and K-theory of isotropic Grassmanians and symplectic loop Grassmanians. We also establish new inte...

Daugherty, Zajj; Virk, Rahbar

2011-01-01T23:59:59.000Z

53

Thermodynamic functions of degenerate magnetized electron gas  

SciTech Connect (OSTI)

The Fermi energy, pressure, internal energy, entropy, and heat capacity of completely degenerate relativistic electron gas are calculated by numerical methods. It is shown that the maximum admissible magnetic field on the order of 10{sup 9} G in white dwarfs increases the pressure by a factor of 1.06 in the central region, where the electron concentration is {approx}10{sup 33} cm{sup -3}, while the equilibrium radius increases by approximately a factor of 1.03, which obviously cannot be observed experimentally. A magnetic field of {approx}10{sup 8} G or lower has no effect on the pressure and other thermodynamic functions. It is also shown that the contribution of degenerate electron gas to the total pressure in neutron stars is negligible compared to that of neutron gas even in magnetic fields with a maximum induction {approx}10{sup 17} G possible in neutron stars. The neutron beta-decay forbiddeness conditions in a superstrong magnetic field are formulated. It is assumed that small neutron stars have such magnetic fields and that pulsars with small periods are the most probable objects that can have super-strong magnetic fields.

Skobelev, V. V., E-mail: v.skobelev@inbox.ru [Moscow State Industrial University (Russian Federation)

2011-11-15T23:59:59.000Z

54

Single-Degenerate Type Ia Supernovae Are Preferentially Overluminous  

E-Print Network [OSTI]

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...

Fisher, Robert

2015-01-01T23:59:59.000Z

55

Anomalous skin effects in a weakly magnetized degenerate electron plasma  

SciTech Connect (OSTI)

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].

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

56

Quantum weak chaos in a degenerate system  

E-Print Network [OSTI]

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.

V. Ya. Demikhovskii; D. I. Kamenev; G. A. Luna-Acosta

1998-09-27T23:59:59.000Z

57

Distinct optical properties of relativistically degenerate matter  

SciTech Connect (OSTI)

In this paper, we use the collisional quantum magnetohydrodynamic (CQMHD) model to derive the transverse dielectric function of a relativistically degenerate electron fluid and investigate various optical parameters, such as the complex refractive index, the reflection and absorption coefficients, the skin-depth and optical conductivity. In this model we take into accounts effects of many parameters such as the atomic-number of the constituent ions, the electron exchange, electron diffraction effect and the electron-ion collisions. Study of the optical parameters in the solid-density, the warm-dense-matter, the big-planetary core, and the compact star number-density regimes reveals that there are distinct differences between optical characteristics of the latter and the former cases due to the fundamental effects of the relativistic degeneracy and other quantum mechanisms. It is found that in the relativistic degeneracy plasma regime, such as found in white-dwarfs and neutron star crusts, matter possess a much sharper and well-defined step-like reflection edge beyond the x-ray electromagnetic spectrum, including some part of gamma-ray frequencies. It is also remarked that the magnetic field intensity only significantly affects the plasma reflectivity in the lower number-density regime, rather than the high density limit. Current investigation confirms the profound effect of relativistic degeneracy on optical characteristics of matter and can provide an important plasma diagnostic tool for studying the physical processes within the wide scope of quantum plasma regimes be it the solid-density, inertial-confined, or astrophysical compact stars.

Akbari-Moghanjoughi, M. [Department of Physics, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz 51745-406 (Iran, Islamic Republic of); International Centre for Advanced Studies in Physical Sciences and Institute for Theoretical Physics, Ruhr University Bochum, Bochum D-44780 (Germany)

2014-06-15T23:59:59.000Z

58

Healthy Eyes Bulletin Your Eyes Are the Windows to Your Health.  

E-Print Network [OSTI]

to an increased risk of developing age-related macular degeneration,cataract,and optic nerve damage,all of which signs of damage or disease. Your eye care professional is the only one who can determine if your eyes,look for ones that block out 99 to 100 percent of both UV-A and UV-B radiation. Give your eyes a rest.If you

Baker, Chris I.

59

Gell-Mann and Low formula for degenerate unperturbed states  

E-Print Network [OSTI]

The Gell-Mann and Low switching allows to transform eigenstates of an unperturbed Hamiltonian $H_0$ into eigenstates of the modified Hamiltonian $H_0 + V$. This switching can be performed when the initial eigenstate is not degenerate, under some gap conditions with the remainder of the spectrum. We show here how to extend this approach to the case when the ground state of the unperturbed Hamiltonian is degenerate. More precisely, we prove that the switching procedure can still be performed when the initial states are eigenstates of the finite rank self-adjoint operator $\\cP_0 V \\cP_0$, where $\\cP_0$ is the projection onto a degenerate eigenspace of $H_0$.

Christian Brouder; Gianluca Panati; Gabriel Stoltz

2009-12-08T23:59:59.000Z

60

Exudate-based diabetic macular edema detection in fundus images using publicly available datasets  

SciTech Connect (OSTI)

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 through the presence of exudation. 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 (e.g., the classifier was trained on an independent dataset and tested on MESSIDOR). Our algorithm obtained an AUC between 0.88 and 0.94 depending on the dataset/features used. Additionally, it does not need ground truth at lesion level to reject false positives and is computationally efficient, as it generates a diagnosis on an average of 4.4 s (9.3 s, considering the optic nerve localization) per image on an 2.6 GHz platform with an unoptimized Matlab implementation.

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

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Automatic Diabetic Macular Edema Detection in Fundus Images Using Publicly Available Datasets  

SciTech Connect (OSTI)

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.

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

62

Loss of Daylight Vision in Retinal Degeneration: Are  

E-Print Network [OSTI]

Loss of Daylight Vision in Retinal Degeneration: Are Oxidative Stress and Metabolic Dysregulation, particularly in cones, the type of photoreceptors that mediate daylight and color vision. The evidence, providing our daylight vision, and have many of the same features and vulnerabilities as rod photoreceptors

Tabin, Cliff

63

Mss. 12 December 2013 DEGENERATIONS OF IRRATIONAL TORIC VARIETIES  

E-Print Network [OSTI]

.XA for w RA > gives an identification between limiting positions of positive torus translations of XA to a finite configuration of real vectors. The positive torus acts on X by translation, and we consider limits toric variety, toric degeneration. This material is based on work done while Postinghel and Sottile were

Sottile, Frank

64

White Dwarf Properties and the Degenerate Electron Gas  

E-Print Network [OSTI]

White Dwarf Properties and the Degenerate Electron Gas Nicholas Rowell April 10, 2008 Contents 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.2 Consequences for the Mass of White Dwarfs . . . . . . . . . . . . . . . . . . . . 7 3 1 Introduction White dwarfs are the second most common type of star in the Galaxy, and represent

Tittley, Eric

65

Linear harmonic oscillator in spaces with degenerate metrics  

E-Print Network [OSTI]

With the help of contraction method we study the harmonic oscillator in spaces with degenerate metrics, namely, on Galilei plane and in the flat 3D Cayley-Klein spaces $R_3(j_2,j_3).$ It is shown that the inner degrees of freedom are appeared which physical dimensions are different from the dimension of the space.

N. A. Gromov

2006-03-02T23:59:59.000Z

66

A New Merging Double Degenerate Binary in the Solar Neighborhood  

E-Print Network [OSTI]

Characterizing the local space density of double degenerate binary systems is a complementary approach to broad sky surveys of double degenerates to determine the expected rates of white dwarf binary mergers, in particular those that may evolve into other observable phenomena such as extreme helium stars, Am CVn systems, and supernovae Ia. However, there have been few such systems detected in local space. We report here the discovery that WD 1242$-$105, a nearby bright WD, is a double-line spectroscopic binary consisting of two degenerate DA white dwarfs of similar mass and temperature, despite it previously having been spectroscopically characterized as a single degenerate. Follow-up photometry, spectroscopy, and trigonometric parallax have been obtained in an effort to determine the fundamental parameters of each component of this system. The binary has a mass ratio of 0.7 and a trigonometric parallax of 25.5 mas, placing it at a distance of 39 pc. The system's total mass is 0.95 M$_\\odot$ and has an orbita...

Debes, John H; Tremblay, Pier-Emmanuel; López-Morales, Mercedes; Anglada-Escudé, Guillem; Napiwotzki, Ralf; Osip, David; Weinberger, Alycia

2015-01-01T23:59:59.000Z

67

Remarks on Cyclotomic and Degenerate Cyclotomic BMW Algebras  

E-Print Network [OSTI]

We relate the structure of cyclotomic and degenerate cyclotomic BMW algebras, for arbitrary parameter values, to that for admissible parameter values. In particular, we show that these algebras are cellular. We characterize those parameter sets for affine BMW algebras over an algebraically closed field that permit the algebras to have non--trivial cyclotomic quotients.

Goodman, Frederick M

2010-01-01T23:59:59.000Z

68

Interpolating 3D Diffusion Tensors in 2D Planar Domain by Locating Degenerate Lines  

E-Print Network [OSTI]

, Shigeo Takahashi1, and Issei Fujishiro2 1 Graduate School of Frontier Sciences, The University of Tokyo. Degenerate lines are generated in this process to retain the smooth transitions of anisotropic features degenerate points and generating degenerate lines. The main idea is to cluster discrete tensor samples

Takahashi, Shigeo

69

Production of quantum degenerate strontium gases: Larger, better, faster, colder  

E-Print Network [OSTI]

We report on an improved scheme to generate Bose-Einstein condensates (BECs) and degenerate Fermi gases of strontium. This scheme allows us to create quantum gases with higher atom number, a shorter time of the experimental cycle, or deeper quantum degeneracy than before. We create a BEC of 84-Sr exceeding 10^7 atoms, which is a 30-fold improvement over previously reported experiments. We increase the atom number of 86-Sr BECs to 2.5x10^4 (a fivefold improvement), and refine the generation of attractively interacting 88-Sr BECs. We present a scheme to generate 84-Sr BECs with a cycle time of 2s, which, to the best of our knowledge, is the shortest cycle time of BEC experiments ever reported. We create deeply-degenerate 87-Sr Fermi gases with T/T_F as low as 0.10(1), where the number of populated nuclear spin states can be set to any value between one and ten. Furthermore, we report on a total of five different double-degenerate Bose-Bose and Bose-Fermi mixtures. These studies prepare an excellent starting poi...

Stellmer, Simon; Schreck, Florian

2012-01-01T23:59:59.000Z

70

Electrostatic rogue-waves in relativistically degenerate plasmas  

SciTech Connect (OSTI)

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.

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

71

THE AFTERCLAP OF DEGENERATE CARBON IGNITION REVISITED Abstract.-Whether the degenerate C-0 cores, with develop in the heart of 4-8 II  

E-Print Network [OSTI]

THE AFTERCLAP OF DEGENERATE CARBON IGNITION REVISITED Abstract.- Whether the degenerate C-0 cores on the results of carbon ignition and on the nature of the propagation of the burning front. The velocity density (p> 5 x 109 g/cm3 ), electron captures and concomitant neu- trino losses will then offset

Boyer, Edmond

72

Remarkable Degenerate Quantum Stabilizer Codes Derived from Duadic Codes  

E-Print Network [OSTI]

Good quantum codes, such as quantum MDS codes, are typically nondegenerate, meaning that errors of small weight require active error-correction, which is--paradoxically--itself prone to errors. Decoherence free subspaces, on the other hand, do not require active error correction, but perform poorly in terms of minimum distance. In this paper, examples of degenerate quantum codes are constructed that have better minimum distance than decoherence free subspaces and allow some errors of small weight that do not require active error correction. In particular, two new families of [[n,1,>= sqrt(n)

Salah A. Aly; Andreas Klappenecker; Pradeep Kiran Sarvepalli

2006-01-18T23:59:59.000Z

73

E-Print Network 3.0 - alleviates radiation-induced degeneration...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

too much overhead (any... .2 Selfish users and degenerate space-sharing In the previous section, I assumed that the distribution... , these effects will eventually drive the...

74

Coupled modes in magnetized dense plasma with relativistic-degenerate electrons  

SciTech Connect (OSTI)

Low frequency electrostatic and electromagnetic waves are investigated in ultra-dense quantum magnetoplasma with relativistic-degenerate electron and non-degenerate ion fluids. The dispersion relation is derived for mobile as well as immobile ions by employing hydrodynamic equations for such plasma under the influence of electromagnetic forces and pressure gradient of relativistic-degenerate Fermi gas of electrons. The result shows the coexistence of shear Alfven and ion modes with relativistically modified dispersive properties. The relevance of results to the dense degenerate plasmas of astrophysical origin (for instance, white dwarf stars) is pointed out with brief discussion on ultra-relativistic and non-relativistic limits.

Khan, S. A. [National Centre for Physics, Quaid-i-Azam University Campus, Islamabad 45320 (Pakistan)

2012-01-15T23:59:59.000Z

75

Dwarf spheroidal galaxies as degenerate gas of free fermions  

E-Print Network [OSTI]

In this paper we analyze a simple scenario in which Dark Matter (DM) consists of free fermions with mass $m_f$. 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 configuration 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 $m_f$. 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 $m_f\\simeq 200$ 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.

Valerie Domcke; Alfredo Urbano

2014-12-16T23:59:59.000Z

76

Study of the cyclicity of some degenerate graphics inside quadratic systems  

E-Print Network [OSTI]

Study of the cyclicity of some degenerate graphics inside quadratic systems F. Dumortier, Hasselt make essential steps in proving the finite cyclicity of degenerate graphics in quadratic systems, having a line of singular points in the finite plane. In particular we consider the graphics (DF1a), (DF2

Rousseau, Christiane

77

Quantum degenerate mixtures of strontium and rubidium atoms  

E-Print Network [OSTI]

We report on the realization of quantum degenerate gas mixtures of the alkaline-earth element strontium with the alkali element rubidium. A key ingredient of our scheme is sympathetic cooling of Rb by Sr atoms that are continuously laser cooled on a narrow linewidth transition. This versatile technique allows us to produce ultracold gas mixtures with a phase-space density of up to 0.06 for both elements. By further evaporative cooling we create double Bose-Einstein condensates of 87Rb with either 88Sr or 84Sr, reaching more than 10^5 condensed atoms per element for the 84Sr-87Rb mixture. These quantum gas mixtures constitute an important step towards the production of a quantum gas of polar, open-shell RbSr molecules.

Pasquiou, Benjamin; Tzanova, Slava; Stellmer, Simon; Szczepkowski, Jacek; Parigger, Mark; Grimm, Rudolf; Schreck, Florian

2013-01-01T23:59:59.000Z

78

Harmonic entanglement in a degenerate parametric down conversion  

E-Print Network [OSTI]

We study the harmonic entanglement and squeezing in a two-mode radiation produced in a degenerate parametric down conversion process coupled to a two-mode vacuum reservoir employing the linearization procedure. It is found that there is a quadrature entanglement between the harmonically related fundamental and second-harmonic modes and the superimposed radiation exhibits a significant two-mode squeezing. The entanglement exits even when there is no two-mode squeezing, since the correlation leading to these phenomena are essentially different. In addition, the more the external coherent light is down converted, the more stronger the entanglement and mean photon number of the two-mode radiation would be which is not generally true for squeezing.

Sintayehu Tesfa

2007-07-25T23:59:59.000Z

79

Initial evolution of supports of solutions of quasilinear parabolic equations with degenerate absorption potential  

SciTech Connect (OSTI)

The propagation of supports of solutions of second-order quasilinear parabolic equations is studied; the equations are of the type of nonstationary diffusion, having semilinear absorption with an absorption potential which degenerates on the initial plane. We find sufficient conditions, which are sharp in a certain sense, on the relationship between the boundary regime and the type of degeneration of the potential to ensure the strong localization of solutions. We also establish a weak localization of solutions for an arbitrary potential which degenerates only on the initial plane. Bibliography: 12 titles.

Stepanova, Ekaterina V; Shishkov, Andrey E

2013-03-31T23:59:59.000Z

80

Hamilton-Jacobi Theory for Degenerate Lagrangian Systems with Holonomic and Nonholonomic Constraints  

E-Print Network [OSTI]

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.

Melvin Leok; Tomoki Ohsawa; Diana Sosa

2011-09-27T23:59:59.000Z

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

The effective density of randomly moving electrons and related characteristics of materials with degenerate electron gas  

SciTech Connect (OSTI)

Interpretation of the conductivity of metals, of superconductors in the normal state and of semiconductors with highly degenerate electron gas remains a significant issue if consideration is based on the classical statistics. This study is addressed to the characterization of the effective density of randomly moving electrons and to the evaluation of carrier diffusion coefficient, mobility, and other parameters by generalization of the widely published experimental results. The generalized expressions have been derived for various kinetic parameters attributed to the non-degenerate and degenerate electron gas, by analyzing a random motion of the single type carriers in homogeneous materials. The values of the most important kinetic parameters for different metals are also systematized and discussed. It has been proved that Einstein's relation between the diffusion coefficient and the drift mobility of electrons is held for any level of degeneracy if the effective density of randomly moving carriers is properly taken into account.

Palenskis, V., E-mail: vilius.palenskis@ff.vu.lt [Radiophysics Department, Faculty of Physics, Vilnius University, Saul?tekio al. 9, LT-10222, Vilnius (Lithuania)

2014-04-15T23:59:59.000Z

82

Dyakonov-perel electron spin relaxation in a highly degenerate wurtzite semiconductor  

SciTech Connect (OSTI)

The doping density dependence of the electron spin lifetime in n-type bulk GaN is investigated up to the highly degenerate regime by time-resolved Kerr-rotation spectroscopy. We find a non-monotonic doping density dependence with maximum spin lifetimes at the onset of degeneracy. The reduction of spin lifetimes in the degenerate regime shows a weak ?{sub s}?n{sub D}{sup ?2/3} density dependence, in full agreement with Dyakonov-Perel theory.

Rudolph, J.; Buß, J. H.; Hägele, D. [Arbeitsgruppe Spektroskopie der kondensierten Materie, Ruhr-Universität Bochum, Universitätsstraße 150, D-44780 Bochum (Germany); Semond, F. [Centre de Recherche sur l'Hétéro-Epitaxie et ses Applications, Centre National de la Recherche Scientifique, Sophia Antipolis, Valbonne (France)

2013-12-04T23:59:59.000Z

83

Longitudinal permeability of collisional plasmas under arbitrary degree of degeneration of electron gas  

E-Print Network [OSTI]

Electric conductivity and dielectric permeability of the non-degenerate electronic gas for the collisional plasmas under arbitrary degree of degeneration of electron gas is found. The kinetic equation of Wigner - Vlasov - Boltzmann with collision integral in relaxation form BGK (Bhatnagar, Gross and Krook) in coordinate space is used. Dielectric permeability with using of the relaxation equation in the momentum space has been received by Mermin. Comparison with Mermin's formula has been realized. It is shown, that in the limit when Planck's constant tends to zero expression for dielectric permeability passes in the classical.

A. V. Latyshev; A. A. Yushkanov

2010-03-04T23:59:59.000Z

84

Coherent backscattering of intense light by cold atoms with degenerate energy levels: Diagrammatic treatment  

E-Print Network [OSTI]

We present a generalization of the diagrammatic pump-probe approach to coherent backscattering (CBS) of intense laser light for atoms with degenerate energy levels. We employ this approach for a characterization of the double scattering signal from optically pumped atoms with the transition $J_g\\rightarrow J_e=J_g+1$ in the helicity preserving polarization channel. We show that, in the saturation regime, the internal degeneracy becomes manifest for atoms with $J_g\\geq 1$, leading to a faster decrease of the CBS enhancement factor with increasing saturation parameter than in the non-degenerate case.

V. N. Shatokhin; R. Blattmann; T. Wellens; A. Buchleitner

2014-07-10T23:59:59.000Z

85

A nonlinear model for magnetoacoustic waves in dense dissipative plasmas with degenerate electrons  

SciTech Connect (OSTI)

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.

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

86

Analytical model of electron transport in polycrystalline, degenerately doped ZnO films  

SciTech Connect (OSTI)

An analytical description of the charge carrier transport, valid for non-degenerated and degenerated semiconductors, was developed, critically reviewed, and fitted to the temperature-dependent Hall mobility data of magnetron sputtered, degenerately doped ZnO:Al films. Our extended model for grain boundary scattering in semiconductors of arbitrary degeneracy is based on previous models from literature and suitable to describe the Hall mobility of the carriers as a function of the free carrier concentration and the temperature at the same time. It is mathematically simple enough for a fast fit procedure, which is not possible with most of the previous models. Applying a combined transport model consisting of ionized impurity scattering, phonon scattering, and grain boundary scattering in degenerate semiconductors, we were able to determine the trap density at the grain boundaries N{sub t} ? 3?×?10{sup 13} to 5?×?10{sup 13?}cm{sup ?2} and the deformation potential E{sub ac} in the range of 5?eV to 9?eV depending on the details of the transport model.

Bikowski, André, E-mail: andre.bikowski@helmholtz-berlin.de; Ellmer, Klaus [Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institute for Solar Fuels, Hahn-Meitner-Platz 1, D-14109 Berlin (Germany)

2014-10-14T23:59:59.000Z

87

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...

88

Thermodynamic functions of a nonrelativistic degenerate neutron gas in a magnetic field  

SciTech Connect (OSTI)

The Fermi energy, partial concentrations of polarized neutrons, pressure, and volume energy density of a degenerate nonrelativistic neutron gas in a magnetic field are calculated using numerical methods taking into account the anomalous magnetic moment of a neutron. The results of calculations are a generalization of relations underlying the Oppenheimer-Volkov model of a neutron star to the case of an applied magnetic field. An ultrastrong (up to 10{sup 17} G) magnetic field changes the pressure and internal energy of the star and affects it static configuration and evolution. It is shown that a degenerate neutron gas in ultrastrong and weak magnetic fields is paramagnetic; the corresponding values of magnetic susceptibility differ by a factor on the order of unity. The possibility of experimentally verifying the results from analysis of pulsar-emitted radiation is discussed.

Skobelev, V. V., E-mail: v.skobelev@inbox.ru [Moscow State Industrial University (Russian Federation)

2010-01-15T23:59:59.000Z

89

Screening Corrections to the Electron Capture Rates in Dense Stars by the Relativistically Degenerate Electron Liquid  

E-Print Network [OSTI]

We calculate the screening corrections to the electron capture rates in dense stars by the relativistically degenerate electron liquid. In order to calculate the screening corrections we adopt the linear response theory which is widely used in the field of solid state physics and liquid metal physics. In particular, we use the longitudinal dielectric function for the relativistically degenerate electron liquid derived by Jancovici. We calculate the screening potential at the position of the nucleus. By using this screening potential one can calculate the screening corrections to the electron capture rates. We will present accurate analytic fitting formulae which summarize our numerical results. These fitting formulae will facilitate the application of the present results. The screening corrections to the electron capture rates are typically a few percent.

Naoki Itoh; Nami Tomizawa; Masaya Tamamura; Shinya Wanajo; Satoshi Nozawa

2007-08-02T23:59:59.000Z

90

Optical imaging through turbid media with a degenerate four-wave mixing correlation time gate  

DOE Patents [OSTI]

Optical imaging through turbid media is demonstrated using a degenerate four-wave mixing correlation time gate. An apparatus and method for detecting ballistic and/or snake light while rejecting unwanted diffusive light for imaging structures within highly scattering media are described. Degenerate four-wave mixing (DFWM) of a doubled YAG laser in rhodamine 590 is used to provide an ultrafast correlation time gate to discriminate against light that has undergone multiple scattering and therefore has lost memory of the structures within the scattering medium. Images have been obtained of a test cross-hair pattern through highly turbid suspensions of whole milk in water that are opaque to the naked eye, which demonstrates the utility of DFWM for imaging through turbid media. Use of DFWM as an ultrafast time gate for the detection of ballistic and/or snake light in optical mammography is discussed.

Sappey, Andrew D. (Golden, CO)

1998-04-14T23:59:59.000Z

91

Improved "Position Squared" Readout of a Mechanical Resonator in an Optical Cavity Using Degenerate Optical Modes  

E-Print Network [OSTI]

Optomechanical devices in which a flexible SiN membrane is placed inside an optical cavity allow for very high finesse and mechanical quality factor in a single device. They also provide fundamentally new functionality: the cavity detuning can be a quadratic function of membrane position. This enables a measurement of "position squared" ($x^2$) and in principle a QND phonon number readout of the membrane. However, the readout achieved using a single transverse cavity mode is not sensitive enough to observe quantum jumps between phonon Fock states. Here we demonstrate an $x^2$-sensitivity that is orders of magnitude stronger using two transverse cavity modes that are nearly degenerate. We derive a first-order perturbation theory to describe the interactions between nearly-degenerate cavity modes and achieve good agreement with our measurements using realistic parameters. We also demonstrate theoretically that the $x^2$-coupling should be easily tunable over a wide range.

Jack C. Sankey; Andrew M. Jayich; Benjamin M. Zwickl; Cheng Yang; Jack G. E. Harris

2008-11-09T23:59:59.000Z

92

Shock waves and double layers in electron degenerate dense plasma with viscous ion fluids  

SciTech Connect (OSTI)

The properties of ion-acoustic shock waves and double layers propagating in a viscous degenerate dense plasma (containing inertial viscous ion fluid, non-relativistic and ultra-relativistic degenerate electron fluid, and negatively charged stationary heavy element) is investigated. A new nonlinear equation (viz. Gardner equation with additional dissipative term) is derived by the reductive perturbation method. The properties of the ion-acoustic shock waves and double layers are examined by the analysis of the shock and double layer solutions of this new equation (we would like to call it “M-Z equation”). It is found that the properties of these shock and double layer structures obtained from this analysis are significantly different from those obtained from the analysis of standard Gardner or Burgers’ equation. The implications of our results to dense plasmas in astrophysical objects (e.g., non-rotating white dwarf stars) are briefly discussed.

Mamun, A. A. [Department of Physics, Jahangirnagar University, Savar (Bangladesh)] [Department of Physics, Jahangirnagar University, Savar (Bangladesh); Zobaer, M. S. [Department of Applied Science, Bangladesh University of Textiles, Tejgaon (Bangladesh)] [Department of Applied Science, Bangladesh University of Textiles, Tejgaon (Bangladesh)

2014-02-15T23:59:59.000Z

93

Magnetosonic waves interactions in a spin-1/2 degenerate quantum plasma  

SciTech Connect (OSTI)

We investigate the magnetosonic waves and their interactions in a spin-1/2 degenerate quantum plasma. With the help of the extended Poincaré-Lighthill-Kuo perturbation method, we derive two Korteweg-de Vries-Burgers equations to describe the magnetosonic waves. The parameter region where exists magnetosonic waves and the phase diagram of the compressive and rarefactive solitary waves with different plasma parameters are shown. We further explore the effects of quantum diffraction, quantum statistics, and electron spin magnetization on the head-on collisions of magnetosonic solitary waves. We obtain the collision-induced phase shifts (trajectory changes) analytically. Both for the compressive and rarefactive solitary waves, it is found that the collisions only lead to negative phase shifts. Our present study should be useful to understand the collective phenomena related to the magnetosonic wave collisions in degenerate plasmas like those in the outer shell of massive white dwarfs as well as to the potential applications of plasmas.

Li, Sheng-Chang, E-mail: lsc1128lsc@126.com [School of Science, Xi'an Jiaotong University, Xi'an 710049 (China)] [School of Science, Xi'an Jiaotong University, Xi'an 710049 (China); Han, Jiu-Ning [Department of Physics, Hexi University, Zhangye 734000 (China)] [Department of Physics, Hexi University, Zhangye 734000 (China)

2014-03-15T23:59:59.000Z

94

Study of degenerate parabolic system modeling the hydrogen displacement in a nuclear waste repository  

E-Print Network [OSTI]

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.

Caro, Florian; Saad, Mazen

2012-01-01T23:59:59.000Z

95

A new type of surface waves in a fully degenerate quantum plasma  

E-Print Network [OSTI]

We study the response of a semi-bounded one-component fully degenerate electron plasma to an initial perturbation in the electrostatic limit. We show that the part of the electric potential corresponding to surface waves in such plasma can be represented, at large times, as the sum of two terms, one term corresponding to "conventional" (Langmuir) surface waves and the other term representing a new type of surface waves resulting from specific analytic properties of degenerate plasma's dielectric response function. These two terms are characterized by different oscillation frequencies (for a given wave number), and, while the "conventional" term's amplitude decays exponentially with time, the new term is characterized by a slower, power-law decay of the oscillation amplitude and is therefore dominant at large times.

Yuriy Tyshetskiy; Roman Kompaneets; Sergey V. Vladimirov

2014-04-06T23:59:59.000Z

96

Controlled Fusion with Hot-ion Mode in a Degenerate Plasma  

SciTech Connect (OSTI)

n a Fermi-degenerate plasma, the rate of electron physical processes is much reduced from the classical prediction, possibly enabling new regimes for controlled nuclear fusion, including the hot-ion mode, a regime in which the ion temperature exceeds the electron temperature. Previous calculations of these processes in dense plasmas are now corrected for partial degeneracy and relativistic effects, leading to an expanded regime of self-sustained fusion.

S. Son and N.J. Fisch

2005-12-01T23:59:59.000Z

97

Analysis of the RPE sheet in the rd10 retinal degeneration model  

SciTech Connect (OSTI)

The normal RPE sheet in the C57Bl/6J mouse is subclassified into two major tiling patterns: A regular generally hexagonal array covering most of the surface and a 'soft network' near the ciliary body made of irregularly shaped cells. Physics models predict these two patterns based on contractility and elasticity of the RPE cell, and strength of cellular adhesion between cells. We hypothesized and identified major changes in RPE regular hexagonal tiling pattern in rdl0 compared to C57BL/6J mice. RPE sheet damage was extensive but occurred in rd10 later than expected, after most retinal degeneration. RPE sheet changes occur in zones with a bullseye pattern. In the posterior zone around the optic nerve RPE cells take on larger irregular and varied shapes to form an intact monolayer. In mid periphery, there is a higher than normal density of cells that progress into involuted layers of RPE under the retina. The periphery remains mostly normal until late stages of degeneration. The number of neighboring cells varies widely depending on zone and progression. RPE morphology continues to deteriorate long after the photoreceptors have degenerated. The RPE cells are bystanders to the rd10 degeneration within photo receptors, and the collateral damage to the RPE sheet resembles stimulation of migration or chemotaxis. Quantitative measures of the tiling patterns and histopathology detected here, scripted in a pipeline written in Perl and Cell Profiler (an open source Matlab plugin), are directly applicable to RPE sheet images from noninvasive fundus autofluorescence (FAF), adaptive optics confocal scanning laser ophthalmoscope (AO-cSLO), and spectral domain optical coherence tomography (SD-OCT) of patients with early stage AMD or RP.

Jiang, Yi [Los Alamos National Laboratory

2011-01-04T23:59:59.000Z

98

Bunching-induced asymmetry in degenerate four-wave mixing with cold atoms  

SciTech Connect (OSTI)

We have investigated degenerate four-wave mixing in a sample of cold rubidium atoms. A red-blue asymmetry is observed for high intensities of the pumping beams. This asymmetry is explained by the spatial bunching of the atoms in the nodes or antinodes of the strong standing wave of the pump beams. This explanation is confirmed by different experimental configurations and by numerical simulations.

Gattobigio, G. L. [Institut Non Lineaire de Nice, UMR 6618 CNRS, 1361 route des Lucioles, F-06560 Valbonne (France); Dipartimento di Fisica dell'Universita di Ferrara and INFN-Sezione di Ferrara, 44100 Ferrara (Italy); Michaud, F.; Kaiser, R. [Institut Non Lineaire de Nice, UMR 6618 CNRS, 1361 route des Lucioles, F-06560 Valbonne (France); Javaloyes, J. [Department de Fisica Interdisciplinar, IMEDEA (CSIC-UIB), C/Miquel Marques, 21, E-07190 Esporles (Spain); Tabosa, J. W. R. [Departamento de Fisica, Universidade Federal de Pernambuco, Av. Professor Luiz Freire, s/n Cidade Universitaria, 50670-901, Recife-PE, Brasil (Brazil)

2006-10-15T23:59:59.000Z

99

The space of degenerate Whittaker models for GL(4) over p-adic fields  

E-Print Network [OSTI]

The space of degenerate Whittaker models for GL(4) over p-adic fields Dipendra Prasad February 23, 2007 1 Introduction Let G = GL2n(k) where k is a non-Archimedean local field. Let P be the (n, n . These considerations also work for the group G = GL2(D) where D is any central simple algebra with center k. Again

Prasad, Dipendra

100

From constant to non-degenerately vanishing magnetic fields in superconductivity  

E-Print Network [OSTI]

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.

Bernard Helffer; Ayman Kachmar

2015-03-30T23:59:59.000Z

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

OPTICAL ABSORPTION IN DEGENERATE SEMICONDUCTORS By J. GAVORET, P. NOZIRES, B. ROULET and M. COMBESCOT,  

E-Print Network [OSTI]

987. OPTICAL ABSORPTION IN DEGENERATE SEMICONDUCTORS By J. GAVORET, P. NOZI�RES, B. ROULET and M-Bernard, Paris, 5e (France). (Reçu le 15 septembre 1969.) Résumé. 2014 L'absorption optique dans les electrons de conduction et le trou profond créé par absorption. Une attention particulière est donnée aux

Paris-Sud XI, Université de

102

The SU(1, 1) Perelomov number coherent states and the non-degenerate parametric amplifier  

SciTech Connect (OSTI)

We construct the Perelomov number coherent states for an arbitrary su(1, 1) group operation and study some of their properties. We introduce three operators which act on Perelomov number coherent states and close the su(1, 1) Lie algebra. By using the tilting transformation we apply our results to obtain the energy spectrum and eigenfunctions of the non-degenerate parametric amplifier. We show that these eigenfunctions are the Perelomov number coherent states of the two-dimensional harmonic oscillator.

Ojeda-Guillén, D., E-mail: dojedag@ipn.mx; Granados, V. D. [Escuela Superior de Física y Matemáticas, Instituto Politécnico Nacional, Ed. 9, Unidad Profesional Adolfo López Mateos, C.P. 07738 México D. F. (Mexico)] [Escuela Superior de Física y Matemáticas, Instituto Politécnico Nacional, Ed. 9, Unidad Profesional Adolfo López Mateos, C.P. 07738 México D. F. (Mexico); Mota, R. D. [Escuela Superior de Ingeniería Mecánica y Eléctrica, Unidad Culhuacán, Instituto Politécnico Nacional, Av. Santa Ana No. 1000, Col. San Francisco Culhuacán, Delegación Coyoacán, C.P. 04430, México D. F. (Mexico)] [Escuela Superior de Ingeniería Mecánica y Eléctrica, Unidad Culhuacán, Instituto Politécnico Nacional, Av. Santa Ana No. 1000, Col. San Francisco Culhuacán, Delegación Coyoacán, C.P. 04430, México D. F. (Mexico)

2014-04-15T23:59:59.000Z

103

Multiple scattering of slow ions in a partially degenerate electron fluid  

SciTech Connect (OSTI)

We extend former investigation to a partially degenerate electron fluid at any temperature of multiple slow ion scattering at T=0. We implement an analytic and mean-field interpolation of the target electron dielectric function between T=0 (Lindhard) and T{yields}{infinity} (Fried-Conte). A specific attention is given to multiple scattering of proton projectiles in the keV energy range, stopped in a hot-electron plasma at solid density.

Popoff, Romain; Maynard, Gilles; Deutsch, Claude [Laboratoire de Physique des Gaz et des Plasmas, UMR 8578, Universite Paris-Sud XI, Orsay 91400 (France)

2009-10-15T23:59:59.000Z

104

Solitons and shocks in dense astrophysical magnetoplasmas with relativistic degenerate electrons and positrons  

SciTech Connect (OSTI)

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.

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

105

Instanton solutions mediating tunneling between the degenerate vacua in curved space  

SciTech Connect (OSTI)

We investigate the instanton solution between the degenerate vacua in curved space. We show that there exist O(4)-symmetric solutions not only in de Sitter but also in both flat and anti-de Sitter space. The geometry of the new type of solutions is finite and preserves the Z{sub 2} symmetry. The nontrivial solution corresponding to the tunneling is possible only if gravity is taken into account. The numerical solutions as well as the analytic computations using the thin-wall approximation are presented. We expect that these solutions do not have any negative mode as in the instanton solution.

Lee, Bum-Hoon; Lee, Wonwoo [Department of Physics and BK21 Division, and Center for Quantum Spacetime, Sogang University, Seoul 121-742 (Korea, Republic of); Lee, Chul H. [Department of Physics, Hanyang University, Seoul 133-791 (Korea, Republic of); Oh, Changheon [Department of Physics, Hanyang University, Seoul 133-791 (Korea, Republic of); Principal Researcher Center, Technovation Partners, Seoul 135-824 (Korea, Republic of)

2010-07-15T23:59:59.000Z

106

Temporally stable coherent states in energy degenerate systems: The hydrogen atom  

E-Print Network [OSTI]

Klauder's recent generalization of the harmonic oscillator coherent states [J. Phys. A 29, L293 (1996)] is applicable only in non-degenerate systems, requiring some additional structure if applied to systems with degeneracies. The author suggests how this structure could be added, and applies the complete method to the hydrogen atom problem. To illustrate how a certain degree of freedom in the construction may be exercised, states are constructed which are initially localized and evolve semi-classically, and whose long time evolution exhibits "fractional revivals."

Michael G. A. Crawford

2001-01-18T23:59:59.000Z

107

Extracellular ATP inhibits Schwann cell dedifferentiation and proliferation in an ex vivo model of Wallerian degeneration  

SciTech Connect (OSTI)

Highlights: Black-Right-Pointing-Pointer ATP-treated sciatic explants shows the decreased expression of p75NGFR. Black-Right-Pointing-Pointer Extracellular ATP inhibits the expression of phospho-ERK1/2. Black-Right-Pointing-Pointer Lysosomal exocytosis is involved in Schwann cell dedifferentiation. Black-Right-Pointing-Pointer Extracellular ATP blocks Schwann cell proliferation in sciatic explants. -- Abstract: After nerve injury, Schwann cells proliferate and revert to a phenotype that supports nerve regeneration. This phenotype-changing process can be viewed as Schwann cell dedifferentiation. Here, we investigated the role of extracellular ATP in Schwann cell dedifferentiation and proliferation during Wallerian degeneration. Using several markers of Schwann cell dedifferentiation and proliferation in sciatic explants, we found that extracellular ATP inhibits Schwann cell dedifferentiation and proliferation during Wallerian degeneration. Furthermore, the blockage of lysosomal exocytosis in ATP-treated sciatic explants is sufficient to induce Schwann cell dedifferentiation. Together, these findings suggest that ATP-induced lysosomal exocytosis may be involved in Schwann cell dedifferentiation.

Shin, Youn Ho; Lee, Seo Jin [Department of Anatomy, College of Medicine, Kyung Hee University, Heogi-Dong 1, Dongdaemun-Gu, Seoul 130-701 (Korea, Republic of)] [Department of Anatomy, College of Medicine, Kyung Hee University, Heogi-Dong 1, Dongdaemun-Gu, Seoul 130-701 (Korea, Republic of); Jung, Junyang, E-mail: jjung@khu.ac.kr [Department of Anatomy, College of Medicine, Kyung Hee University, Heogi-Dong 1, Dongdaemun-Gu, Seoul 130-701 (Korea, Republic of)] [Department of Anatomy, College of Medicine, Kyung Hee University, Heogi-Dong 1, Dongdaemun-Gu, Seoul 130-701 (Korea, Republic of)

2013-01-11T23:59:59.000Z

108

Born-Oppenheimer-type Approximations for Degenerate Potentials: Recent Results and a Survey on the area  

E-Print Network [OSTI]

This paper is devoted to the asymptotics of eigenvalues for a Schr\\"o-dinger operator in the case when the potential V does not tend to infinity at infinity. Such a potential is called degenerate. The point is that the set in the phase space where the associated hamiltonian is smaller than a fixed energy E may have an infinite volume, so that the Weyl formula which gives the behaviour of the counting function has to be revisited. We recall various results in this area, in the classical context as well as in the semi-classical one and comment the different methods. In sections 3, 4 we present our joint works with A Morame, (Universit\\'e de Nantes),concerning a degenerate potential V(x) =f(y) g(z), where g is assumed to be a homogeneous positive function of m variables, and f is a smooth and strictly positive function of n variables, with a minimum in 0. In the case where f tends to infinity at infinity, we give the semi-classical asymptotic behaviour of the number of eigenvalues less than a fixed energy . Then we give a sharp estimate of the low eigenvalues, using a Born Oppenheimer approximation. With a refined approach we localize also higher energies . Finally we apply the previous methods to a class of potentials which vanish on a regular hypersurface.

Francoise Truc

2009-01-05T23:59:59.000Z

109

Spectra of Open-Shell Nuclei with Padé-Resummed Degenerate Perturbation Theory  

E-Print Network [OSTI]

We apply degenerate many-body perturbation theory at high orders for the ab-initio description of ground states and excitation spectra of open-shell nuclei using soft realistic nucleon-nucleon interactions. We derive a recursive formulation of standard degenerate many-body perturbation theory that enables us to evaluate order-by-order perturbative energy and state corrections up to the 30th order. We study 6,7-Li as test cases using a similarity renormalization group (SRG) evolved nucleon-nucleon interaction from chiral effective field theory. The simple perturbation series exhibits a strong, often oscillatory divergence, as was observed previously for ground states of closed-shell nuclei. Even for very soft interactions resulting from SRG evolutions up to large flow parameter, i.e. low momentum scales, the perturbation series still diverges. However, a resummation of the perturbation series via Pad\\'e approximants yields very stable and converged ground and excited-state energies in very good agreement with exact no-core shell-model calculations for the same model space.

Joachim Langhammer; Robert Roth; Christina Stumpf

2012-11-29T23:59:59.000Z

110

Quantitative degenerate four-wave mixing spectroscopy: Probes for molecular species  

SciTech Connect (OSTI)

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.

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

111

Electron-exchange effects on the charge capture process in degenerate quantum plasmas  

SciTech Connect (OSTI)

The electron-exchange effects on the charge capture process are investigated in degenerate quantum plasmas. The Bohr-Lindhard formalism with the effective interaction potential is employed to obtain the charge capture radius, capture probability, and capture cross section as functions of the impact parameter, projectile energy, electron-exchange parameter, Fermi energy, and plasmon energy. The result shows that the electron-exchange effect enhances the charge capture radius and the charge capture cross section in semiconductor quantum plasmas. It is also found that the charge capture radius and charge capture cross section increases with an increase of the Fermi energy and, however, decreases with increasing plasmon energy. Additionally, it is found that the peak position of the charge capture cross section is receded from the collision center with an increase of the electron-exchange parameter.

Jung, Young-Dae, E-mail: ydjung@hanyang.ac.kr [Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180-3590 (United States) [Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180-3590 (United States); Department of Applied Physics and Department of Bionanotechnology, Hanyang University, Ansan, Kyunggi-Do 426-791 (Korea, Republic of); Akbari-Moghanjoughi, M. [Azarbaijan Shahid Madani University, Faculty of Sciences, Department of Physics, 51745-406 Tabriz (Iran, Islamic Republic of) [Azarbaijan Shahid Madani University, Faculty of Sciences, Department of Physics, 51745-406 Tabriz (Iran, Islamic Republic of); International Centre for Advanced Studies in Physical Sciences and Institute for Theoretical Physics, Ruhr University Bochum, D-44780 Bochum (Germany)

2014-03-15T23:59:59.000Z

112

The Modelling of Degenerate Neck Pinch Singularities in Ricci Flow by Bryant Solitons  

E-Print Network [OSTI]

In earlier work, carrying out numerical simulations of the Ricci flow of families of rotationally symmetric geometries on $S3$, we have found strong support for the contention that (at least in the rotationally symmetric case) the Ricci flow for a ``critical'' initial geometry - one which is at the transition point between initial geometries (on $S^3$) whose volume-normalized Ricci flows develop a singular neck pinch, and other initial geometries whose volume normalized Ricci flows converge to a round sphere - evolves into a ``degenerate neck pinch.'' That is, we have seen in this earlier work that the Ricci flows for the critical geometries become locally cylindrical in a neighborhood of the initial pinching, and have the maximum amount of curvature at one or both of the poles. Here, we explore the behavior of these flows at the poles, and find strong support for the conjecture that the Bryant steady solitons accurately model this polar flow.

David Garfinkle; James Isenberg

2007-09-04T23:59:59.000Z

113

Measurement of the elements of {chi}{sup (3)} for degenerate four-wave mixing in OH  

SciTech Connect (OSTI)

Measurements of the polarization characteristics of degenerate four-wave mixing transitions in the A{sup 2}{Sigma}+ {r_arrow} X{sup 2}{product}(0,0) band of OH are found to disagree with theory and are attributed to population gratings from open-system effects.

Rahn, L.A. [Sandia National Labs., Livermore, CA (United States); Brown, M.S. [SRI International, Palo Alto, CA (United States). Molecular Physics Lab.

1992-02-01T23:59:59.000Z

114

Non-degenerate shell-model effective interactions from the Okamoto-Suzuki and Krenciglowa-Kuo iteration methods  

E-Print Network [OSTI]

We present calculations of shell-model effective interactions for both degenerate and non-degenerate model spaces using the Krenciglowa-Kuo (KK) and the extended Krenciglowa-Kuo iteration method recently developed by Okamoto, Suzuki {\\it et al.} (EKKO). The starting point is the low-momentum nucleon-nucleon interaction $V_{low-k}$ obtained from the N$^3$LO chiral two-nucleon interaction. The model spaces spanned by the $sd$ and $sdpf$ shells are both considered. With a solvable model, we show that both the KK and EKKO methods are convenient for deriving the effective interactions for non-degenerate model spaces. The EKKO method is especially desirable in this situation since the vertex function $\\hat Z$-box employed therein is well behaved while the corresponding vertex function $\\hat Q$-box employed in the Lee-Suzuki (LS) and KK methods may have singularities. The converged shell-model effective interactions given by the EKKO and KK methods are equivalent, although the former method is considerably more efficient. The degenerate $sd$-shell effective interactions given by the LS method are practically identical to those from the EKKO and KK methods. Results of the $sd$ one-shell and $sdpf$ two-shell calculations for $^{18}$O, $^{18}$F, $^{19}$O and $^{19}$F using the EKKO effective interactions are compared, and the importance of the shell-model three-nucleon forces is discussed.

Huan Dong; T. T. S. Kuo; J. W. Holt

2011-05-23T23:59:59.000Z

115

Short Communication Lens Defects and Age-Related Fiber Cell  

E-Print Network [OSTI]

of Increased A PP Gene Dosage in Down Syndrome Peter H. Frederikse and Xiao-Ou Ren From the Department Early-onset cataract and Alzheimer's disease occur with high frequency in Down syndrome (trisomy 21 report on mice carrying a com- plete copy of a wild-type human A PP (hA PP) gene from the Down syndrome

Frederikse, Peter

116

Age-Related Changes in Task Related Functional Network Connectivity  

E-Print Network [OSTI]

the information load [2,3,4], retention interval [5,6] and response time duration [7,8]. Results from fMRI studies-serving these processes have been elucidated with experimental manipulations that vary task demands by altering with these alterations in task demands [9]. Advancing age is associated with decreased performance on verbal working

117

Smoothed Particle Hydrodynamics simulations of the core-degenerate scenario for Type Ia supernovae  

E-Print Network [OSTI]

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...

Aznar-Siguán, G; Lorén-Aguilar, P; Soker, N; Kashi, A

2015-01-01T23:59:59.000Z

118

Reproducing neutrino effects on the matter power spectrum through a degenerate Fermi gas approach  

E-Print Network [OSTI]

Modifications on the predictions about the matter power spectrum based on the hypothesis of a tiny contribution from a degenerate Fermi gas (DFG) test-fluid to some dominant cosmological scenario are investigated. Reporting about the systematic way of accounting for all the cosmological perturbations, through the Boltzmann equation we obtain the analytical results for density fluctuation, $\\delta$, and fluid velocity divergence, $\\theta$, of the DFG. Small contributions to the matter power spectrum are analytically obtained for the radiation-dominated background, through an ultra-relativistic approximation, and for the matter-dominated and $\\Lambda$-dominated eras, through a non-relativistic approximation. The results can be numerically reproduced and compared with those of considering non-relativistic and ultra-relativistic neutrinos into the computation of the matter power spectrum. Lessons concerning the formation of large scale structures of a DFG are depicted, and consequent deviations from standard $\\Lambda$CDM predictions for the matter power spectrum (with and without neutrinos) are quantified.

E. L. D. Perico; Alex E. Bernardini

2011-04-11T23:59:59.000Z

119

Reaction-in-Flight Neutrons as a Test of Stopping Power in Degenerate Plasmas  

E-Print Network [OSTI]

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.

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

120

The circumstellar matter of supernova 2014J and the core-degenerate scenario  

E-Print Network [OSTI]

I show that the circumstellar matter (CSM) of the type Ia supernova 2014J is too massive and its momentum too large to be accounted for by any but the core-degenerate (CD) scenario for type Ia supernovae. Assuming the absorbing gas is of CSM origin, the several shells responsible of the absorption potassium lines are accounted for by a mass loss episode from a massive asymptotic giant branch star during a common envelope phase with a white dwarf companion. The time-varying potassium lines can be accounted for by ionization of neutral potassium and the Na-from-dust absorption (NaDA) model. Before explosion some of the potassium resides in the gas phase and some in dust. Weakening in absorption strength is caused by potassium-ionizing radiation of the supernova, while release of atomic potassium from dust increases the absorption. I conclude that if the absorbing gas originated from the progenitor of SN 2014J, then a common envelope phase took place about 15,000 years ago, leading to the merging of the core wit...

Soker, Noam

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Acceleration and dynamics of an electron in the degenerate and magnetized plasma elliptical waveguide  

SciTech Connect (OSTI)

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.

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

122

Exact solution for the degenerate ground-state manifold of a strongly interacting one-dimensional Bose-Fermi mixture  

SciTech Connect (OSTI)

We present the exact solution for the many-body wavefunction of a one-dimensional mixture of bosons and spin-polarized fermions with equal masses and infinitely strong repulsive interactions under external confinement. Such a model displays a large degeneracy of the ground state. Using a generalized Bose-Fermi mapping, we find the solution for the whole set of ground-state wave functions of the degenerate manifold and we characterize them according to group-symmetry considerations. We find that the density profile and the momentum distribution depends on the symmetry of the solution. By combining the wave functions of the degenerate manifold with suitable symmetry and guided by the strong-coupling form of the Bethe-Ansatz solution for the homogeneous system, we propose an analytic expression for the many-body wave function of the inhomogeneous system which well describes the ground state at finite, large, and equal interaction strengths, as validated by numerical simulations.

Fang, Bess [Department of Physics, Block S12, Faculty of Science, National University of Singapore, 2 Science Drive 3, Singapore 117542 (Singapore); Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543 (Singapore); Vignolo, Patrizia; Gattobigio, Mario [Universite de Nice-Sophia Antipolis, Institut Non Lineaire de Nice, CNRS, 1361 route des Lucioles, F-06560 Valbonne (France); Miniatura, Christian [Department of Physics, Block S12, Faculty of Science, National University of Singapore, 2 Science Drive 3, Singapore 117542 (Singapore); Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543 (Singapore); Universite de Nice-Sophia Antipolis, Institut Non Lineaire de Nice, CNRS, 1361 route des Lucioles, F-06560 Valbonne (France); Minguzzi, Anna [Universite Grenoble 1, CNRS, LPMMC, UMR5493, Maison des Magisteres, F-38042 Grenoble (France)

2011-08-15T23:59:59.000Z

123

Common Variants at 9p21 and 8q22 Are Associated with Increased Susceptibility to Optic Nerve Degeneration in Glaucoma  

E-Print Network [OSTI]

Optic nerve degeneration caused by glaucoma is a leading cause of blindness worldwide. Patients affected by the normal-pressure form of glaucoma are more likely to harbor risk alleles for glaucoma-related optic nerve ...

Ernst, Jason M.

124

EVOLUTION OF POST-IMPACT REMNANT HELIUM STARS IN TYPE Ia SUPERNOVA REMNANTS WITHIN THE SINGLE-DEGENERATE SCENARIO  

SciTech Connect (OSTI)

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.

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

125

Elastic properties of the degenerate f.c.c. crystal of polydisperse soft dimers at zero temperature  

E-Print Network [OSTI]

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.

J. W. Narojczyk; K. W. Wojciechowski

2015-04-12T23:59:59.000Z

126

Microwave degenerate parametric down-conversion with a single cyclic three-level system in circuit QED  

E-Print Network [OSTI]

With the assistance of a single cyclic three-level system, which can be realized by a superconducting flux qubit, we study theoretically the degenerate microwave parametric down-conversion (PDC) in a superconducting transmission line resonator with the fundamental and second harmonic modes involved. By adiabatically eliminating the excited states of the three-level system, we obtain an effective microwave PDC Hamiltonian for the two resonator modes in such a circuit QED system. The corresponding PDC efficiency in our model can be much larger than that in the similar circuit QED system based on a single two-level superconducting qubit [K. Moon and S. M. Girvin, Phys. Rev. Lett. {\\bf 95}, 140504 (2005)]. Furthermore, we consider the squeezing and bunching behavior of the fundamental mode resulting from the coherent drive to the second harmonic one.

Z. H. Wang; C. P. Sun; Yong Li

2014-09-09T23:59:59.000Z

127

Quasiparticle spectrum and dynamical stability of an atomic Bose-Einstein condensate coupled to a degenerate Fermi gas  

E-Print Network [OSTI]

The quasiparticle excitations and dynamical stability of an atomic Bose-Einstein condensate coupled to a quantum degenerate Fermi gas of atoms at zero temperature is studied. The Fermi gas is assumed to be either in the normal state or to have undergone a phase transition to a superfluid state by forming Cooper pairs. The quasiparticle excitations of the Bose-Einstein condensate exhibit a dynamical instability due to a resonant exchange of energy and momentum with quasiparticle excitations of the Fermi gas. The stability regime for the bosons depends on whether the Fermi gas is in the normal state or in the superfluid state. We show that the energy gap in the quasiparticle spectrum for the superfluid state stabilizes the low energy energy excitations of the condensate. In the stable regime, we calculate the boson quasiparticle spectrum, which is modified by the fluctuations in the density of the Fermi gas.

C. P. Search; H. Pu; W. Zhang; P. Meystre

2001-12-20T23:59:59.000Z

128

Spectroscopic Analysis of the DAB White Dwarf PG 1115+166: An Unresolved DA + DB Degenerate Binary  

E-Print Network [OSTI]

A spectroscopic analysis of the DAB white dwarf PG 1115+166 is presented. The observed hydrogen and helium line profiles are shown to be incompatible with model spectra calculated under the assumption of homogeneous or stratified chemical compositions. In contrast, an excellent fit to the optical spectrum of PG 1115+166 can be achieved if the object is interpreted as an unresolved double degenerate composed of a hydrogen-line DA star and a helium-line DB star. The atmospheric parameters obtained from the best fit are Teff=22,090 K and log g=8.12 for the DA star, Teff=16,210 K and log g=8.19 for the DB star. This binary interpretation is consistent with the results recently reported by Burleigh et al. that PG 1115+166 also exhibits radial velocity variations. The implications of this discovery with respect to the DAB spectral class are discussed.

P. Bergeron; James Liebert

2001-10-25T23:59:59.000Z

129

arXiv:1105.4207v1[math.RT]21May2011 Affine and degenerate affine BMW algebras: The center  

E-Print Network [OSTI]

arXiv:1105.4207v1[math.RT]21May2011 Affine and degenerate affine BMW algebras: The center Zajj and affine BMW algebras arise naturally in the context of Schur- Weyl duality for orthogonal and symplectic Lie algebras and quantum groups, respectively. Cyclotomic BMW algebras, affine Hecke algebras

Ram, Arun

130

Monte Carlo Study of Strongly-Interacting Degenerate Fermions: a Model for Voltage-Biased Bilayer Graphene  

E-Print Network [OSTI]

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_fdegenerate fermion system, with a remnant Fermi surface distorted by a superfluid excitonic condensate. The model thus shows qualitatively different behaviour to any model with mu=/=0 previously studied by lattice simulation.

Wes Armour; Simon Hands; Costas Strouthos

2013-02-07T23:59:59.000Z

131

Nonlinear theory of ionic sound waves in a hot quantum-degenerate electron-positron-ion plasma  

SciTech Connect (OSTI)

A collisionless nonmagnetized e-p-i plasma consisting of quantum-degenerate gases of ions, electrons, and positrons at nonzero temperatures is considered. The dispersion equation for isothermal ionic sound waves is derived and analyzed, and an exact expression is obtained for the linear velocity of ionic sound. Analysis of the dispersion equation has made it possible to determine the ranges of parameters in which nonlinear solutions in the form of solitons should be sought. A nonlinear theory of isothermal ionic sound waves is developed and used for obtaining and analyzing the exact solution to the system of initial equations. Analysis has been carried out by the method of the Bernoulli pseudopotential. The ranges of phase velocities of periodic ionic sound waves and soliton velocities are determined. It is shown that in the plasma under investigation, these ranges do not overlap and that the soliton velocity cannot be lower than the linear velocity of ionic sound. The profiles of physical quantities in a periodic wave and in a soliton are constructed, as well as the dependences of the velocity of sound and the critical velocity on the ionic concentration in the plasma. It is shown that these velocities increase with the ion concentration.

Dubinov, A. E., E-mail: dubinov-ae@yandex.ru; Sazonkin, M. A., E-mail: figma@mail.r [Sarov State Physicotechnical Institute (Russian Federation)

2010-11-15T23:59:59.000Z

132

Separated spin-up and spin-down quantum hydrodynamics of degenerated electrons: spin-electron acoustic wave appearance  

E-Print Network [OSTI]

Quantum hydrodynamic (QHD) model of charged spin-1/2 particles contains physical quantities defined for all particles of a species including particles with spin-up and with spin-down. Different population of states with different spin direction is included in the spin density (magnetization). In this paper we derive a QHD model, which separately describes spin-up electrons and spin-down electrons. Hence we consider electrons with different projection of spin on the preferable direction as two different species of particles. We show that numbers of particles with different spin direction do not conserve. Hence the continuity equations contain sources of particles. These sources are caused by the interactions of spins with magnetic field. Terms of similar nature arise in the Euler equation. We have that z-projection of the spin density is no longer an independent variable. It is proportional to difference between concentrations of electrons with spin-up and electrons with spin-down. In terms of new model we consider propagation of waves in magnetized plasmas of degenerate electrons and motionless ions. We show that new form of QHD equations gives all solutions obtained from traditional form of QHD equations with no distinguish of spin-up and spin-down states. But it also reveals a sound-like solution we call the spin-electron acoustic wave. Coincidence of most solutions is expected since we started derivation with the same basic equation.

Pavel A. Andreev

2014-05-04T23:59:59.000Z

133

Summary of current research interests Much of our work includes the morphological characterisation of human  

E-Print Network [OSTI]

, Bailey T, Zhang J, Knupp C, Cheetham ME, Greenwood J, Luthert PJ. Modulation of Sub-RPE deposits in vitro-related macular degeneration. Prog Ret Eye Res (2001) 20: 705-732. Chong NHV, Alexander RA, Waters L, Barnett KC in hereditary retinal degeneration. IOVS (1999) 40: 1298-1305 Bailey A, Luthert P, Dean A, Harding B, Janota I

Saunders, Mark

134

Is Lutein a Physiologically Important Ligand for Transthyretin in Humans?  

SciTech Connect (OSTI)

Lutein and zeaxanthin are the only carotenoids accumulated in the macula of the human retina and are known as the macular pigments (MP). These pigments account for the yellow color of the macula and appear to play an important role in protecting against age-related macular degeneration (AMD). The uptake of lutein and zeaxanthin in human eyes is remarkably specific. It is likely that specific transport or binding proteins are involved. The objective is to determine whether transthyretin (TTR) is a transport protein in human plasma and could thus deliver lutein from the blood to the retina. In this study, they used a biosynthetic {sup 13}C-lutein tracer and gas chromatography-combustion interfaced-isotope ratio mass spectrometry (GCC-IRMS) to gain the requisite sensitivity to detect the minute amounts of lutein expected as a physiological ligand for human transthyretin. The biosynthetic {sup 13}C-labeled lutein tracer was purified from algae. Healthy women (n = 4) each ingested 1 mg of {sup 13}C-labeled lutein daily for 3 days and a blood sample was collected 24 hours after the final dose. Plasma TTR was isolated by retinol-binding protein (RBP)-sepharose affinity chromatography and extracted with chloroform. The {sup 13}C/{sup 12}C ratio in the TTR extract was measured by GCC-IRMS. There was no {sup 13}C-lutein enrichment in the pure TTR extract. This result indicated that lutein is not associated with TTR in human plasma after ingestion in physiological amounts. Some hydrophobic compounds with yellow color may bind to human TTR in the plasma. However, this association needs to be further proved by showing specificity. The study provides a new approach for carotenoid-binding protein studies using a stable isotope tracer method combined with the high precision of GCC-IRMS. The mechanism of selective transport, uptake, and accumulation of lutein in human macula remain to be determined.

Liwei Chen

2003-05-31T23:59:59.000Z

135

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-diversity PSA  

E-Print Network [OSTI]

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

Touch, Joe

136

E-Print Network 3.0 - age-related diabetes mellitus Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

), a medicine approved to treat diabetes mellitus, will prevent a second stroke or heart attack by reversing... of diabetes mellitus; and you are willing to commit to a...

137

E-Print Network 3.0 - age-related peripheral arterial Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

? Peripheral Arterial Disease (PAD) is a serious condition that is associated with heart attack and stroke. PAD... immediately if you believe you're at risk. HOW COMMON IS...

138

E-Print Network 3.0 - age-related rheumatoid factors Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

88% 83% 16 (1... , rheumatoid factor, calendar year, duration of ... Source: Robins, James M.- Departments of Biostatistics & Epidemiology, Harvard University Collection:...

139

E-Print Network 3.0 - age-related metabolic dysfunction Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sciences and Ecology 13 Decline in mitochondrial bioenergetics and shift to ketogenic profile in brain during reproductive senescence Summary: . In both nonTg and 3xTgAD group,...

140

Brain site-specific proteome changes in aging-related dementia  

E-Print Network [OSTI]

our Ingenuity Pathway Analysis (IPA)- based network analysisIngenuity Pathways Analysis (IPA, http://www.ingenuity.com)in the AD brain, we used IPA (http://www.ingenui- ty.com).

Manavalan, Arulmani; Mishra, Manisha; Feng, Lin; Sze, Siu Kwan; Akatsu, Hiroyasu; Heese, Klaus

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

age-related lh surge: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

RELEASE FOLLOWING STEROID MANIPULATIONS Physics Websites Summary: ) and prolactin (PRL) levels have been studied in groups of immature normal male and female Wistar rats and...

142

Age-Related Changes in the Spontaneous Motor Rhythms of the  

E-Print Network [OSTI]

, Department of Psychology, Bowling Green State University, Bowling Green, Ohio, USA The present study examined of Psychology, Bowling Green State University, Bowling Green, OH 43403, USA. E-mail: mcauley

Liu, Taosheng

143

Age-related disruptions in circadian timing: evidence for "split" activity rhythms in the SAMP8  

E-Print Network [OSTI]

for Neuroscience, Mind, and Behavior, Department of Psychology, Bowling Green State University, Bowling Green, OH

Liu, Taosheng

144

attenuates age-related decrements: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

where no assembled, virialized clusters are detected either in the optical or X-ray wave-band. Invoking quasar outflows, we argue that both thermal and kinematic decrements...

145

GABAergic systems in a model of age-related cognitive impairment  

E-Print Network [OSTI]

activity (Brioni et al., 1990; Durkin, 1992). These data suggest that one way which the BF GABAergic system may influence learning and memory is through modulation of hippocampal ACh levels that are correlated with learning and memory. In addition... consequently is involved in the modulation of the olfactory system (Mesulam et al., 1983; Zaborszky et al., 1999).The olfactory system refers to interconnected structures that are involved in the transduction and processing of odors. Included in this system...

LaSarge, Candi Lynn

2012-07-16T23:59:59.000Z

146

Brain site-specific proteome changes in aging-related dementia  

E-Print Network [OSTI]

Cb (Table 7). SOD2, MBP and VIM were modulated in all brainROCK, SLC25A5, SOD2, TMCO3, UBC, VIM and XPR1), of which 22SLC6A9, SOD2, TMEM131, UBC, VIM and ZNF358), of which 8

Manavalan, Arulmani; Mishra, Manisha; Feng, Lin; Sze, Siu Kwan; Akatsu, Hiroyasu; Heese, Klaus

2013-01-01T23:59:59.000Z

147

age-related hearing impairment: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of Temporally Processed Speech by Listeners with Hearing Impairment Lauren Calandruccio (SPC), for a group of listeners with varying degrees of sensorineural hearing loss. SPC is...

148

Exploring Age-Related Environmental Attitudes in the Context of Wood Product Certification  

E-Print Network [OSTI]

environmental standards, which companies could follow in the growing and harvesting of timber. Those that follow including environmental organizations, retailers and wood product companies are interested in developing'. Companies that certify their products encourage environmentally minded consumers to buy their products over

Wu, Qinglin

149

age-related plumage differences: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

with timing of dispersal and plumage morph in a sedentary Environmental Sciences and Ecology Websites Summary: -individual differences may arise due to polymorphic genes...

150

Age-related sensitivity to task-­related modulation of language-processing networks  

E-Print Network [OSTI]

  &   Preprocessing.   Functional,   T2*-­?weighted   echo-­?planar   images   (EPI)   were   acquired  using  a  Siemens  3T  Tim  Trio  MRI   scanner   (Siemens  Medical   Solutions,  Camberley,  UK)  at   the  MRC... the accept- ability judgement task during scanning. 2.4. MRI acquisition and preprocessing Functional, T2*-weighted echo-planar images (EPI) were acquired using a Siemens 3T Tim Trio MRI scanner (Siemens Medical Solutions, Camberley, UK) at the MRC Cognition...

Davis, S. W.; Zhuang, J.; Wright, P.; Tyler, L. K.

2014-08-27T23:59:59.000Z

151

Age-Related Increases in the Shoulder Strength of High School Wrestlers  

E-Print Network [OSTI]

) 0 ) "s 's -c m n 1 ity ) CO cIS TJ O m ».. o ta n' CO c oo .2 >• c 3 "5 O g i l l - •^ * CO "D . t TJ ro 5 " TJ CM © " d' ^ .2 ^ "TO A 0) a ^ ® "ni CO... en •H CO 8 oo CO CM CM •H -H f^ lO CM f^ cy 2 C) CO CM +H CO CO s CO CM -H in CO 2 CD iL L- C O p O COS Z 5 £ £ CD U. U . .^ m u. u. c - • E CO GO >E '" o o o < OO...

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

152

E-Print Network 3.0 - age-related biological activity Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Washington University in St. Louis Collection: Biology and Medicine 2 Dispatch R939 Cognitive aging: New answers to old questions Summary: cerebral blood flow, as well as neural...

153

E-Print Network 3.0 - age-related sleep disturbances Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

efficiency 1.66 0.13 0.41 ... Source: Pennsylvania, University of - Center for Cognitive Neuroscience, Unit for Experimental Psychiatry Collection: Biology and Medicine 3...

154

age-related cortical cataract: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cortical systems for local and global integration in discourse comprehension Giovanna Egidi a, Biology and Medicine Websites Summary: Cortical systems for local and global...

155

E-Print Network 3.0 - aging-related chromatin defects Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

temperature... Research Fund tion at ARS elements in cells carrying defective ORC2Lincoln's Inn Fields and ORC5 (Fox et al... United Kingdom yeast silent mating-type...

156

E-Print Network 3.0 - age-related cellular copper Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

changes in ... Source: Leary, Scot - Department of Biochemistry, University of Saskatchewan Collection: Biology and Medicine 5 Cell Metabolism The Human Cytochrome c Oxidase...

157

E-Print Network 3.0 - advanced age-related cataracts Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

the normal... OPHTHALMOL VIS SCI 21:186-190, 1982.) Key words: Phase separation, X-irradiation, lens, cataract The phase... separation of lens cell cytoplasm may represent an...

158

E-Print Network 3.0 - age-related bone loss Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and Medicine 2 Influence of the degradation of the organic matrix on the microscopic fracture behavior of trabecular bone Summary: . Modeling the mechanical behavior of vertebral...

159

E-Print Network 3.0 - age-related myocardial metabolic Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

myocardial metabolic Page: << < 1 2 3 4 5 > >> 1 Diastolic Dysfunction in Hypertensive Heart Disease Is Associated With Altered Myocardial Metabolism Summary: . Whether the...

160

E-Print Network 3.0 - alleviates age-related oxidative Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Collection: Biology and Medicine 4 Journal of Alzheimer's Disease 6 (2004) 2730 27 Apple juice prevents oxidative stress induced Summary: , neuroblastoma, Alzheimer's disease...

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

E-Print Network 3.0 - age-related muscle weakness Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

(MIT) Collection: Engineering ; Computer Technologies and Information Sciences 37 Comparison between concentric needle EMG and macro EMG in patients with a history of polio...

162

E-Print Network 3.0 - assembly age-related increases Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

SELF-ASSEMBLY FOR MICROSYSTEM INTEGRATION Summary: hybrid piezoelectric micro-pumps. We believe micro assembly becomes increasingly important for system... MULTI-BATCH...

163

E-Print Network 3.0 - age-related nerve decline Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

decline in NPP by making independent ... Source: DeLucia, Evan H. - Department of Plant Biology, University of Illinois at Urbana-Champaign Collection: Environmental Sciences...

164

E-Print Network 3.0 - alleviates age-related proliferation Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

London Collection: Environmental Sciences and Ecology 65 EARS (Enhancing Access to the Radio Spectrum) PROGRAM: The radio spectrum is a finite but exceedingly valuable natural...

165

E-Print Network 3.0 - aging-related degradation occurrences Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

41 Abstract Biological treatment methods are effective at destroying polycyclic aromatic hydro- Summary: of HMW PAH degradation is a common occurrence in nature as these...

166

E-Print Network 3.0 - attenuates age-related lung Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

area of the lung using X-ray attenuation data... Lung Assessment Using Computer Tomography A software program that determines the weight, tissue... composition and various...

167

Solvable model of quantum phase transitions and the symbolic-manipulation-based study of its multiply degenerate exceptional points and of their unfolding  

SciTech Connect (OSTI)

It is known that the practical use of non-Hermitian (i.e., typically, PT-symmetric) phenomenological quantum Hamiltonians H?H{sup †} requires an efficient reconstruction of an ad hoc Hilbert-space metric ?=?(H) which would render the time-evolution unitary. Once one considers just the N-dimensional matrix toy models H=H{sup (N)}, the matrix elements of ?(H) may be defined via a coupled set of N{sup 2} polynomial equations. Their solution is a typical task for computer-assisted symbolic manipulations. The feasibility of such a model-completion construction is illustrated here via a discrete square well model H=p{sup 2}+V endowed with a k-parametric close-to-the-boundary interaction V. The model is shown to possess (possibly, multiply degenerate) exceptional points marking the phase transitions which are attributable, due to the exact solvability of the model at any N

Znojil, Miloslav, E-mail: znojil@ujf.cas.cz

2013-09-15T23:59:59.000Z

168

Degenerate and critical Bloch branes  

SciTech Connect (OSTI)

In the last few years a number of works reported the appearance of thick branes with internal structure, induced by the parameter which controls the interaction between two scalar fields coupled to gravity in (4,1) dimensions in warped space-time with one extra dimension. Here we show that one can implement the control over the brane thickness without needing to change the potential parameter. On the contrary, this is going to be done by means of the variation of a parameter associated with the domain wall degeneracy. We also report the existence of novel and qualitatively different solutions for a critical value of the degeneracy parameter, which could be called critical Bloch branes.

Souza Dutra, A. de [Abdus Salam ICTP, Strada Costiera 11, Trieste, I-34100 Italy (Italy); UNESP-Campus de Guaratingueta-DFQ, Departmento de Fisica e Quimica, 12516-410 Guaratingueta SP Brasil (Brazil); Amaro de Faria, A. C. Jr.; Hott, M. [UNESP-Campus de Guaratingueta-DFQ, Departmento de Fisica e Quimica, 12516-410 Guaratingueta SP Brasil (Brazil)

2008-08-15T23:59:59.000Z

169

Review of Recent Aging-Related Degradation Occurrences of Structures and Passive Components in U.S. Nuclear Power Plants  

SciTech Connect (OSTI)

The Korea Atomic Energy Research Institute (KAERI) and Brookhaven National Laboratory (BNL) are collaborating to develop seismic capability evaluation technology for degraded structures and passive components (SPCs) under a multi-year research agreement. To better understand the status and characteristics of degradation of SPCs in nuclear power plants (NPPs), the first step in this multi-year research effort was to identify and evaluate degradation occurrences of SPCs in U.S. NPPs. This was performed by reviewing recent publicly available information sources to identify and evaluate the characteristics of degradation occurrences and then comparing the information to the observations in the past. Ten categories of SPCs that are applicable to Korean NPPs were identified, comprising of anchorage, concrete, containment, exchanger, filter, piping system, reactor pressure vessel, structural steel, tank, and vessel. Software tools were developed to expedite the review process. Results from this review effort were compared to previous data in the literature to characterize the overall degradation trends.

Nie,J.; Braverman, J.; Hofmayer, C.; Choun, Y.-S.; Kim, M.K.; Choi, I.-K.

2009-04-02T23:59:59.000Z

170

The sensitive period for language acquisition: The role of age related differences in cognitive and neural function  

E-Print Network [OSTI]

S. -A. , Fiebach, C. J. , Kempe, V. , & Friederici, A. D. (1995; Rüschemeyer, Fiebach, Kempe, & Friederici, 2005;

Finn, Amy Sue

2010-01-01T23:59:59.000Z

171

Adolescents with current major depressive disorder show dissimilar patterns of age-related differences in ACC and thalamus  

E-Print Network [OSTI]

, 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...

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

172

Age-related hyperkyphosis, independent of spinal osteoporosis, is associated with impaired mobility in older community-dwelling women  

E-Print Network [OSTI]

independent of spinal osteoporosis, is associated withun- derlying spinal osteoporosis and vertebral fractures,independent of spinal osteoporosis, is associated with

Katzman, W. B.; Vittinghoff, E.; Kado, D. M.

2011-01-01T23:59:59.000Z

173

Age-Related Changes in Vestibular Evoked Myogenic Potentials and Dynamic Visual Acuity at Near and Far Distances  

E-Print Network [OSTI]

Morphological changes in the vestibular system associated with aging are well documented, but the ability to measure these changes clinically has been limited. Two such tests that have been useful for this purpose are ...

Tourtillott, Brandon Michael

2009-09-03T23:59:59.000Z

174

THE POST-MERGER MAGNETIZED EVOLUTION OF WHITE DWARF BINARIES: THE DOUBLE-DEGENERATE CHANNEL OF SUB-CHANDRASEKHAR TYPE Ia SUPERNOVAE AND THE FORMATION OF MAGNETIZED WHITE DWARFS  

SciTech Connect (OSTI)

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.

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

175

Oscillations fortes sur un champ lineairement degenere  

E-Print Network [OSTI]

.1 Solutions BKW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.2 Stabilit´e hyperbolique . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.3 Instabilit´e hyperbolique . . . . . . . . . . . . . . . . . . . . . . . . . 19 4 Solutions BKW

Métivier, Guy

176

Preprocessing and Reduction for Degenerate Semidefinite Programs  

E-Print Network [OSTI]

Feb 18, 2011 ... of Al. I. Cusa, Iasi, Romania, 2010. 16. 623. [51] Q. Zhao, S.E. Karisch, F. Rendl, and H. Wolkowicz. Semidefinite programming relaxations. 624.

2011-02-18T23:59:59.000Z

177

Degenerate weakly nonlinear elastic plane waves  

E-Print Network [OSTI]

Weakly nonlinear plane waves are considered in hyperelastic crystals. Evolution equations are derived at a quadratically nonlinear level for the amplitudes of quasi-longitudinal and quasi-transverse waves propagating in arbitrary anisotropic media. The form of the equations obtained depends upon the direction of propagation relative to the crystal axes. A single equation is found for all propagation directions for quasi-longitudinal waves, but a pair of coupled equations occurs for quasi-transverse waves propagating along directions of degeneracy, or acoustic axes. The coupled equations involve four material parameters but they simplify if the wave propagates along an axis of material symmetry. Thus, only two parameters arise for propagation along an axis of two-fold symmetry, and one for a three-fold axis. The transverse wave equations decouple if the axis is four-fold or higher. In the absence of a symmetry axis it is possible that the evolution equations of the quasi-transverse waves decouple if the third order elastic moduli satisfy a certain identity. The theoretical results are illustrated with explicit examples.

W?odzimierz Doma?ski; Andrew N. Norris

2008-12-18T23:59:59.000Z

178

ITAR: A modified TAR method to determine depth dose distribution for an ophthalmic device that performs kilovoltage x-ray pencil-beam stereotaxy  

SciTech Connect (OSTI)

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.

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

179

Dosimetric properties of a proton beamline dedicated to the treatment of ocular disease  

SciTech Connect (OSTI)

Purpose: A commercial proton eyeline has been developed to treat ocular disease. Radiotherapy of intraocular lesions (e.g., uveal melanoma, age-related macular degeneration) requires sharp dose gradients to avoid critical structures like the macula and optic disc. A high dose rate is needed to limit patient gazing times during delivery of large fractional dose. Dose delivery needs to be accurate and predictable, not in the least because current treatment planning algorithms have limited dose modeling capabilities. The purpose of this paper is to determine the dosimetric properties of a new proton eyeline. These properties are compared to those of existing systems and evaluated in the context of the specific clinical requirements of ocular treatments. Methods: The eyeline is part of a high-energy, cyclotron-based proton therapy system. The energy at the entrance of the eyeline is 105 MeV. A range modulator (RM) wheel generates the spread-out Bragg peak, while a variable range shifter system adjusts the range and spreads the beam laterally. The range can be adjusted from 0.5 up to 3.4 g/cm{sup 2}; the modulation width can be varied in steps of 0.3 g/cm{sup 2} or less. Maximum field diameter is 2.5 cm. All fields can be delivered with a dose rate of 30 Gy/min or more. The eyeline is calibrated according to the IAEA TRS-398 protocol using a cylindrical ionization chamber. Depth dose distributions and dose/MU are measured with a parallel-plate ionization chamber; lateral profiles with radiochromic film. The dose/MU is modeled as a function of range, modulation width, and instantaneous MU rate with fit parameters determined per option (RM wheel). Results: The distal fall-off of the spread-out Bragg peak is 0.3 g/cm{sup 2}, larger than for most existing systems. The lateral penumbra varies between 0.9 and 1.4 mm, except for fully modulated fields that have a larger penumbra at skin. The source-to-axis distance is found to be 169 cm. The dose/MU shows a strong dependence on range (up to 4%/mm). A linear increase in dose/MU as a function of instantaneous MU rate is observed. The dose/MU model describes the measurements with an accuracy of ±2%. Neutron dose is found to be 146 ± 102 ?Sv/Gy at the contralateral eye and 19 ± 13 ?Sv/Gy at the chest. Conclusions: Measurements show the proton eyeline meets the requirements to effectively treat ocular disease.

Slopsema, R. L., E-mail: rslopsema@floridaproton.org; Mamalui, M.; Yeung, D.; Malyapa, R.; Li, Z. [University of Florida Proton Therapy Institute, 2015 North Jefferson Street, Jacksonville, Florida 32205 (United States)] [University of Florida Proton Therapy Institute, 2015 North Jefferson Street, Jacksonville, Florida 32205 (United States); Zhao, T. [Department of Radiation Oncology, Washington University School of Medicine, 4921 Parkview Place, St. Louis, Missouri 63110 (United States)] [Department of Radiation Oncology, Washington University School of Medicine, 4921 Parkview Place, St. Louis, Missouri 63110 (United States)

2014-01-15T23:59:59.000Z

180

E-Print Network 3.0 - accidental macular injury Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Science 67 SAFETY PROCEDURE ACCIDENTINCIDENT INVESTIGATION Summary: in Health Care or Lost Time. An Employees Report of Accidental Injury or Industrial Disease (FORM 7) must......

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

E-Print Network 3.0 - agujero macular con Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

estadsticos. Nuestro trabajo busca ... Source: Canarias, Instituto de Astrofisica de (IAC) Collection: Physics 3 Current Eye Research, 32:791799, 2007 Copyright c Informa...

182

Developmental Mechanisms for Retinal Degeneration in the Blind Cavefish  

E-Print Network [OSTI]

, and Vax1, together with the differen- tiation marker GAD65. We show that eye development is retarded in CF; eye; proliferation; cell death; Shh; Fgf8; Pax6; LIM-homeodomain; Vax1; GABA; teleost; fish Vertebrate

Jeffery, William R.

183

COMPUTING DULAC'S MAPS OF (ALMOST EVERY) NON-DEGENERATE SINGULARITIES  

E-Print Network [OSTI]

eigenvalues of the linearization are nonzero). We describe the order of magnitude of the first two terms in a convenient local analytic chart: XR = x x + (1 + R) y y , R xa C {x, y}(X) for some positive integer

Paris-Sud XI, Université de

184

Tools for primal degenerate linear programs: IPS, DCA, and PE  

E-Print Network [OSTI]

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-

2014-10-01T23:59:59.000Z

185

Row-Reduced Column Generation for Degenerate Master Problems  

E-Print Network [OSTI]

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.

2013-02-06T23:59:59.000Z

186

Trajectory-following methods for large-scale degenerate convex ...  

E-Print Network [OSTI]

Sep 2, 2011 ... Atlas Centre. Rutherford .... trace v(µ). Worse, on ..... to vk(?) about ? = 0 is traced, where the superscript [i] denotes the i-th derivative of vk.

2011-09-02T23:59:59.000Z

187

DEGENERATE PRINCIPAL SERIES FOR SYMPLECTIC AND ODD-ORTHOGONAL GROUPS  

E-Print Network [OSTI]

have been studied in [Gus], [Jan1], [Jan2], [K-R]; also [Tad3]. [Gus] uses Hecke algebra methods factors) for n 3 (any m) and in general for the regular case (for SO2n+1(F)). [Tad3] uses the structure theory from [Tad2], which simplifies the calculation of Jacquet modules, to recover many of the results

Jantzen, Chris

188

Tools for primal degenerate linear programs: IPS, DCA, and PE  

E-Print Network [OSTI]

Oct 8, 2014 ... Abstract: This paper describes three recent tools for dealing with primal ... The idea is to work only with those constraints that correspond to ...

Jean-Bertrand Gauthier

2014-10-08T23:59:59.000Z

189

Supplementary Information Primary amines protect against retinal degeneration in  

E-Print Network [OSTI]

µm column, linear gradient of acetonitrile in water (0­ 100% acetonitrile over 20 min at a flow rate) in a linear gradient of acetonitrile in water (80 ­ 100% acetonitrile over 20 min at a flow rate of 1.5 ml/min). Both solvents contained 0.05% trifluoroacetic acid (TFA). HPLC elution: 9.0 min. UV/Vis (acetonitrile

Palczewski, Krzysztof

190

A Solvable Two-Dimensional Degenerate Singular Stochastic Control Problem  

E-Print Network [OSTI]

. The optimisation is motivated by a storage-consumption model in an electricity market, and features a stochastic investment; electricity market. MSC2010 subsject classification: 91B70, 93E20, 60G40, 49L20. 1 Introduction of electricity markets. Here the first component of the state process is the electricity spot price, represented

Glendinning, Paul

191

Improved Column Generation for Highly Degenerate Master Problems  

E-Print Network [OSTI]

Dec 1, 2011 ... Abstract: Column generation for solving linear programs with a huge number of variables alternates between solving a master problem and a ...

Jacques Desrosiers

2011-12-01T23:59:59.000Z

192

Degenerate resistive switching and ultrahigh density storage in resistive memory  

SciTech Connect (OSTI)

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.

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

193

Multistability and transition to chaos in the degenerate Hamiltonian system with weak nonlinear dissipative perturbation  

E-Print Network [OSTI]

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.

E. V. Felk; A. P. Kuznetsov; A. V. Savin

2013-11-13T23:59:59.000Z

194

Wick rotation for quantum field theories on degenerate Moyal space(-time)  

SciTech Connect (OSTI)

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.

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

195

A finite difference scheme for a degenerated diffusion equation arising in microbial ecology  

E-Print Network [OSTI]

- produced layer of extracellular polymeric substances (EPS). The EPS offers protection to the bacteria water pipes or industrial facilities, and food spoilage. On the other hand, the sorption properties.g. in wastewater treatment, soil remediation, and groundwater protection [23]. While the term biofilm indicates

Demaret, Laurent

196

Role of Pam16's degenerate J domain in protein import across the mitochondrial inner membrane  

E-Print Network [OSTI]

Patrick R. D'Silva*, Brenda Schilke*, William Walter, and Elizabeth A. Craig Department of Biochemistry domain to stim- ulate Ssc1's ATPase domain, and (iii) the innately lower stimulatory activity of the Pam-terminal regions. In addition, the C-terminal region of Pam16 has significant sequence similarity to Pam18's C

Craig, Elizabeth A

197

Data embedding employing degenerate clusters of data having differences less than noise value  

DOE Patents [OSTI]

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.

Sanford, M.T. II; Handel, T.G.

1998-10-06T23:59:59.000Z

198

E-Print Network 3.0 - avoiding degenerate coframes Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of the coframe is the same for each equivalence Source: Olver, Peter - School of Mathematics, University of Minnesota Collection: Mathematics 2 Nonlinearity 5 (1952) 601-621....

199

Relationship between knee and ankle degeneration in a population of organ donors  

E-Print Network [OSTI]

changes at the hip knee and ankle joints during gait areA, Herttula L, Sayed R: Ankle osteoarthritis is associatedof articular cartilage in the ankle and knee joints of human

Muehleman, Carol; Margulis, Arkady; Bae, Won C; Masuda, Koichi

2010-01-01T23:59:59.000Z

200

Impact of degenerate n-doping on the optical absorption edge in transparent conducting cadmium oxide  

E-Print Network [OSTI]

n-type or can be heavily doped. Transparent conductive cadmium oxide (CdO) thin films, for instance devices or modern solar cells, material performance is critically important. A combination of high in the conduction bands of CdO can increase the conductivity up to values desired for technological applications

Schleife, André

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Spatial responses to light in mice with severe retinal degeneration N. Mrosovsky*, Robert R. Hampton  

E-Print Network [OSTI]

the left or the right side to be illuminated. Illumination was provided by a 57 cm long fluorescent bulb

Hampton, Robert

202

Fluctuations and state preparation in quantum degenerate gases of sodium and lithium  

E-Print Network [OSTI]

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; ...

Su, Edward (Edward Joseph)

2014-01-01T23:59:59.000Z

203

Characterization of RPGR Variants and Their Role in Inherited Retinal Degeneration  

E-Print Network [OSTI]

and illustration of Rpgr expression in the retina ...................................................................... 24 2.2 Antibody map for mouse Rpgr and comparison of Rpgrex1-19 and RpgrORF15 expression in the developing retina... structures and analysis of whirlin expression in the mouse retina at the RNA level......... 56 xii FIGURE Page 3.2 Antibody maps...

Wright, Rachel

2012-10-19T23:59:59.000Z

204

Non-Invasive Detection of Early Retinal Neuronal Degeneration by Ultrahigh Resolution Optical Coherence  

E-Print Network [OSTI]

Coherence Tomography Debbie Tudor1 , Vedran Kajic´4 , Sara Rey3 , Irina Erchova1,3 , Boris Povazay4 , Bernd Hofer4 , Kate A. Powell3 , David Marshall2 , Paul L. Rosin2 , Wolfgang Drexler4 , James E. Morgan1,5 * 1

Martin, Ralph R.

205

Level set simulations of turbulent thermonuclear deflagration in degenerate carbon and oxygen  

E-Print Network [OSTI]

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.

W. Schmidt; W. Hillebrandt; J. C. Niemeyer

2005-08-02T23:59:59.000Z

206

Research Recruiting Endogenous Tissue Stem Cells to Repair Injury and Degeneration  

SciTech Connect (OSTI)

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.

Peterson, Daniel A. [Rosalind Franklin University of Medicine and Science

2014-10-22T23:59:59.000Z

207

Non-collinear and non-degenerate polarization-entangled photon  

E-Print Network [OSTI]

efficiency measurements using correlated photons", Metrologia, 32, 479-483 (1995). 5. D. Branning, A. L

Sergienko, Alexander

208

Noise-induced cochlear neuronal degeneration and its role in hyperacusis -- and tinnitus-like behavior  

E-Print Network [OSTI]

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 ...

Hickox, Ann E

2013-01-01T23:59:59.000Z

209

E-Print Network 3.0 - astrogliosis axonal degeneration Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

axons to project into the medial geniculate nucleus (MGN). In the accompanying paper (Pallas et al Source: Sur, Mriganka - Department of Brain and Cognitive Science, Massachusetts...

210

E-Print Network 3.0 - anterogradely degenerating axons Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

axons to project into the medial geniculate nucleus (MGN). In the accompanying paper (Pallas et al Source: Sur, Mriganka - Department of Brain and Cognitive Science, Massachusetts...

211

Adaptive optics microperimetry and OCT images show preserved function and recovery of cone visibility in macular telangiectasia type 2 retinal lesions  

E-Print Network [OSTI]

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-

2015-01-01T23:59:59.000Z

212

Optimizing the utility of diffusion imaging for discovering genetic and environmental influences on neural development, degeneration, and disease  

E-Print Network [OSTI]

handedness, gender and dyslexia: a review of the evidence.handedness, gender, and dyslexia: a review of the evidence.in groups of patients with dyslexia (Beaton, 1997), Williams

Jahanshad, Neda

2012-01-01T23:59:59.000Z

213

Optimizing the utility of diffusion imaging for discovering genetic and environmental influences on neural development, degeneration, and disease  

E-Print Network [OSTI]

C. A. , Auinger, P. , & Szilagyi, P. G. 2001. Iron de?ciencyJM, Aligne CA, Auinger P, Szilagyi PG (2001) Iron de?ciencyJM, Aligne CA, Auinger P, Szilagyi PG. Iron de?ciency and

Jahanshad, Neda

2012-01-01T23:59:59.000Z

214

Diamond and Related Materials, 2 (1993) 661 666 661 Degenerate four-wave mixing diagnostics of atmospheric pressure  

E-Print Network [OSTI]

-3]. An r.f. inductively coupled plasma offers the benefits of an "electrodeless" discharge for minimum film application of this new spectroscopic technique to an atmospheric pressure plasma synthesis reactor. DFWM measurements of the CH radicals in the boundary layer of an r.f. inductively coupled plasma deposition reactor

Zare, Richard N.

215

CHIN.PHYS.LETT. Vol. 25, No. 3 (2008) 843 Quantum Degenerate FermiBose Mixtures of 40  

E-Print Network [OSTI]

No 2006CB921101, the National Natural Science Foundation of China for Distinguished Young Scholars under Grant No 10725416, the National Natural Science Foundation of China under Grant No 60678029 gas 40 K by evaporatively cooling bosonic 87 Rb atoms in a quadrupole-Ioffe configura- tion (QUIC

Zhang, Jing

216

Optimizing the utility of diffusion imaging for discovering genetic and environmental influences on neural development, degeneration, and disease  

E-Print Network [OSTI]

controls (Choi et al. , 2005; Stricker et al. , 2009; ZhangLiu et al. , 2009; Stricker et al. , 2009). Additionally,and ILF (Liu et al. , 2009; Stricker et al. , 2009). This

Jahanshad, Neda

2012-01-01T23:59:59.000Z

217

ccsd-00083161,version2-11Sep2006 MIXING ANGLES AND NON-DEGENERATE COUPLED SYSTEMS OF PARTICLES  

E-Print Network [OSTI]

to the Higgs boson are not flavor-diagonal, massive fermions in the standard model form coupled systems (like

Boyer, Edmond

218

Photoessay of the cutaneous manifestations of the idiopathic inflammatory myopathies  

E-Print Network [OSTI]

erosions and crusting. I. C. Heliotrope A hallmark (i.e. ,extend periorbitally. Heliotrope is often associated withFigure 17 Figure 16. Heliotrope. Confluent macular erythema

Dugan, Elizabeth M; Huber, Adam M; Miller, Frederick W; Rider, Lisa G; the International Myositis Assessment and Clinical Studies (IMACS) Group

2009-01-01T23:59:59.000Z

219

Reprintedfrom American Journal of Ophthalmology  

E-Print Network [OSTI]

. ROACH, PHD optical coherence tomography images 0£ macular laser lesions clearly demonstrated differences, Boiling AFB, District of Columbia (Dr Roach). This researchwassponsored by USAF Armstrong Laboratory

Boppart, Stephen

220

Top-Quark Mass Data and the Sum of Quasi-Degenerate Neutrino Masses (One small electroweak-bound e-parameter organizes elementary particle 3-flavor phenomenology)  

E-Print Network [OSTI]

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.

E. M. Lipmanov

2008-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Formation of Quantum-Degenerate Sodium Molecules A current frontier in the field of ultracold gases is the study of ultracold molecules. In  

E-Print Network [OSTI]

a Feshbach resonance [1]. More than 105 molecules were generated with a conversion efficiency of ~4%. High sodium molecules from an atomic Bose- Einstein condensate by ramping an applied magnetic field across trap. The small expansion velocity corresponds to a temperature of about 30 nK, characteristic of high

222

The Vacuolar-ATPase Complex Regulates Retinoblast Proliferation and Survival, Photoreceptor  

E-Print Network [OSTI]

morphogenesis (e.g., Refs. 2­4). In adults, RPE cells play a central role in the transport of ions, water. Several blinding diseases in humans, such as Leber's congenital amaurosis,5,6 Best macular dystrophy,7

Gross, Jeff

223

E-Print Network 3.0 - activity sleep psychiatric Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

age-related changes in spindle activity. To sum... -resolution brain electromagnetic tomography revealed simultaneously ... Source: Ecole Polytechnique, Centre de...

224

Taped or Not Taped Subject ID# D I A G N O S T I C I M P R E S S I O N DATE: ****____ Std. MAP Proc. or Special Proc.__________________ Enrolled in Study  

E-Print Network [OSTI]

_______ ______ Corticobasal ganglionic _______ degeneration ______ Amnestic syndrome _______ ______ Down syndrome, _______________________________________ DAT OR PRODROMAL SYNDROMES _______ Incipient dementia _______ DAT

225

Application of topological sensitivity toward tissue elasticity imaging using magnetic resonance data  

E-Print Network [OSTI]

) and brain degeneration imaging (Green et al., 2008) with promising results. Specifically, the MRE estimates

Guzina, Bojan

226

Summary of current research interests Our group aims to understand the role of molecular chaperones and  

E-Print Network [OSTI]

and protein folding in human disease, particularly retinal degeneration and neurodegeneration. We aim

Saunders, Mark

227

Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at ?s = 8 TeV with the ATLAS detector  

E-Print Network [OSTI]

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 ...

Taylor, Frank E.

228

Retinal ganglion cell survival and axon regeneration in WldS transgenic rats after optic nerve crush and lens injury  

E-Print Network [OSTI]

Abstract Background We have previously shown that the slow Wallerian degeneration mutation, whilst delaying axonal degeneration after optic nerve crush, does not protect retinal ganglion cell (RGC) bodies in adult rats. To test the effects of a...

Lorber, Barbara; Tassoni, Alessia; Bull, Natalie D; Moschos, Marilita M; Martin, Keith R

2012-06-06T23:59:59.000Z

229

8.06 Quantum Physics III, Spring 2003  

E-Print Network [OSTI]

Continuation of 8.05. Units: natural units, scales of microscopic phenomena, applications. Time-independent approximation methods: degenerate and non-degenerate perturbation theory, variational method, Born-Oppenheimer ...

Rajagopal, Krishna, 1965-

230

Mechanical injury and inflammatory cytokines affect cartilage integrity and tissue homeostasis : a mass spectrometric analysis of proteins with relevance to arthritis  

E-Print Network [OSTI]

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, ...

Stevens, Anna L. (Anna Lea)

2006-01-01T23:59:59.000Z

231

A Method for Selective Enrichment and Analysis of Nitrotyrosine...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

found in various neurodegenerative diseases and aging related pathologies; however, the lack of an efficient enrichment method has prevented the analysis of this important low...

232

COGNITIVE DECLINE WITH AGE: ROLE OF STRIATAL CHOLINERGIC SYSTEM AND GROWTH HORMONE.  

E-Print Network [OSTI]

??Normal aging can result in cognitive decline even in the absence of neurodegenerative disease. Successful identification of neurobiological changes that occur in association with age-related… (more)

Nieves-Martinez, Erasmo

2010-01-01T23:59:59.000Z

233

E-Print Network 3.0 - alters adult motivation Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

processing: Reflections of age-related Summary: adults' motivational changes direct cognitive control processes to regulate emotion, leading... across the adult life span. Older...

234

E-Print Network 3.0 - alloys tooth dentin Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Age-related transparent root dentin: mineral concentration, crystallite Summary: ; Fracture; Fatigue 1. Introduction Dentin is the major structural component of the tooth. It is...

235

E-Print Network 3.0 - acute pancreatitis related Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

pivotal role in suppressing aging and age-related... a fluorescent cell 50. A comparison of pancreatic and skin tissues shows that while recombinant ... Source: Engelward,...

236

E-Print Network 3.0 - adrenal gland diseases Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Adrenal gland - modified ... Source: Morrell, Thomas E. - Department of Biology, Ball State University Collection: Environmental Sciences and Ecology 15 Age-related changes...

237

Insulin signaling, dietary restriction and DNA damage : multiple roles for smk-1 in the mediation of C. elegans life span  

E-Print Network [OSTI]

role of oxidative damage and environmental stresses. Natureand environmental insults drive the accumulation of DNA damageenvironmental state. While age- related decay still occurs (due to oxidative damage and

Wolff, Suzanne Christine

2008-01-01T23:59:59.000Z

238

Just over 3,000 years ago at the time of the Yellow Emperor, the Chinese were the first  

E-Print Network [OSTI]

. His lungs begin to degenerate, he has cough in the winter time, but by his pulse you will know him

Olufsen, Mette Sofie

239

Seed Grant Recipients Year Investigator Institution Title  

E-Print Network [OSTI]

An Exploration of Age-Related Changes in Cross-modal Sensation 1999 Frank, Mary Lou/ Hayes, Jill North Georgia of Spirituality in the Counseling Process 1999 Holtsberg, Philip A. University of Georgia Age-Related Differences and Art: The Culture of Quilt Production in the U.S. 1999 Zuiderveen, Jeffrey A. Columbus State University

Arnold, Jonathan

240

Wavelength-doubling optical parametric oscillator  

DOE Patents [OSTI]

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.

Armstrong, Darrell J. (Albuquerque, NM); Smith, Arlee V. (Albuquerque, NM)

2007-07-24T23:59:59.000Z

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

DESIGN OF THE TRANSCONDUCTANCE AMPLIFIER FOR FREQUENCY DOMAIN SAMPLING RECEIVER  

E-Print Network [OSTI]

degeneration circuit ...................... 31 3-5 (a) Simulated noise performance before source degeneration, (b) Simulated noise performance after source degeneration ...................... 32 3-6 Schematic of the high linear Gm... in Fig.2-6. The circuit is differential. ? ? ? Gm?? ? ? ? ? ? Sample Sample Sample Sample 1Out ? 1Out ? 2Out ? 2Out ? Interleaved output LNA ? ? ? ? Fig.2-6 The schematic of a single path 9 2-3. Noise and distortions...

Chen, XI

2010-01-16T23:59:59.000Z

242

Regenerative Architecture: A Pathway Beyond Sustainability.  

E-Print Network [OSTI]

??The current paradigm in the field of architecture today is one of degeneration and obsolete building technologies. Regenerative architecture is the practice of engaging the… (more)

Littman, Jacob A

2009-01-01T23:59:59.000Z

243

E-Print Network 3.0 - advanced subsonic transport Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of Two-Dimensional Conservation Laws Summary: (4.3) in the subsonic region as an equation for whose coefficients evolve according to transport... degenerate elliptic equations...

244

acids modulate glucocorticoid: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

purposes, ulcerated monkeys had marked hippocampal degeneration Hideo Uno; Ross Tarara; James G. Else; Mbaruk A. Suleman; Robert M. Sapolsky 1990-01-01 33 Transcriptional...

245

E-Print Network 3.0 - activate factor xii Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Carlos - Department of Mathematics and Statistics, State University of New York at Albany Collection: Mathematics ; Physics 53 Neuronal degeneration Xp44++ APP695swe Summary:...

246

E-Print Network 3.0 - activated factor xii Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Carlos - Department of Mathematics and Statistics, State University of New York at Albany Collection: Mathematics ; Physics 53 Neuronal degeneration Xp44++ APP695swe Summary:...

247

E-Print Network 3.0 - acid dehalogenase enzyme Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of halorespi- ration in Desulfitobacterium dehalogenans. J. Biol. Chem... of vinyl chloride (VC) to ethene. Degenerate primers targeting conserved regions in reductive...

248

E-Print Network 3.0 - amaurosis protein aipl1 Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

chaperones, RP2 and AIPL1. Molecular chaperone mediated protein... and protein folding in human disease, particularly retinal degeneration and neurodegeneration. We...

249

E-Print Network 3.0 - accessory protein mrap Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Our group aims to understand the role of molecular chaperones and Summary: and protein folding in human disease, particularly retinal degeneration and neurodegeneration. We...

250

Symmetries of the Energy-Momentum Tensor of Cylindrically Symmetric Static Spacetimes  

E-Print Network [OSTI]

We investigate matter symmetries of cylindrically symmetric static spacetimes. These are classified for both cases when the energy-momentum tensor is non-degenerate and also when it is degenerate. It is found that the non-degenerate energy-momentum tensor gives either three, four, five, six, seven or ten independent matter collineations in which three are isometries and the rest are proper. The worth mentioning cases are those where we obtain the group of matter collineations finite-dimensional even the energy-momentum tensor is degenerate. These are either three, four, five or ten. Some examples are constructed satisfying the constraints on the energy-momentum tensor.

M. Sharif

2004-01-14T23:59:59.000Z

251

Classification of Static Plane Symmetric Spacetimes according to their Matter Collineations  

E-Print Network [OSTI]

In this paper we classify static plane symmetric spacetimes according to their matter collineations. These have been studied for both cases when the energy-momentum tensor is non-degenerate and also when it is degenerate. It turns out that the non-degenerate case yields either {\\it four}, {\\it five}, {\\it six}, {\\it seven} or {\\it ten} independent matter collineations in which {\\it four} are isometries and the rest are proper. There exists three interesting cases where the energy-momentum tensor is degenerate but the group of matter collineations is finite-dimensional. The matter collineations in these cases are either {\\it four}, {\\it six} or {\\it ten

M. Sharif

2003-10-03T23:59:59.000Z

252

On the Uniqueness of the Papapetrou--Majumdar Metric  

E-Print Network [OSTI]

We establish the equality of the ADM mass and the total electric charge for asymptotically flat, static electrovac black hole spacetimes with completely degenerate, not necessarily connected horizon.

M. Heusler

1996-07-01T23:59:59.000Z

253

E-Print Network 3.0 - atomic environments implications Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

formation in a degenerate Fermi gas via a Feshbach Resonance Summary: for the efficiency of atom-molecule conversion. Also at Department of Physics, University of Turku,...

254

Decentralizing urbanization : harnessing the potential of small cities in India  

E-Print Network [OSTI]

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 ...

Suri, Sagarika

2011-01-01T23:59:59.000Z

255

Optical low coherence reflectometry for the measurement of collagen thickness  

E-Print Network [OSTI]

of the Raw Interferometric Signal: Set l. . . . . . . . . . . 74 Figure 33. High SNR Collagen Peak of the Raw Interferometric Signal: Set 2 Figure 34. Low SNR Collagen Peak of the Raw Interferometric Signal Set 2 Figure 35 Non-Uniform Translation: SLD..., macular edema, central serous chorioetinopathy and detachments in the retina and epithelium were studied and good results were attained. ' ' One of the earlier studies performed in 1991 used a fiber optic Michelson interferometer with a 830 nm SLD...

Merchant, Jean Carol

1998-01-01T23:59:59.000Z

256

Genetic Regulation of Caenorhabditis elegans Lysosome Related Organelle Function  

E-Print Network [OSTI]

Lysosomes are membrane-bound organelles that contain acid hydrolases that degrade cellular proteins, lipids, nucleic acids, and oligosaccharides, and are important for cellular maintenance and protection against age-related ...

Soukas, Alexander A.

257

Effect of hypertension on the structural and functional integrity of the young and aged brain in an inducible transgenic model   

E-Print Network [OSTI]

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 ...

Pannozzo, Mercede Alcina

2014-06-28T23:59:59.000Z

258

Behavioral impulsivity and hallucinations : insights from Parkinson's disease  

E-Print Network [OSTI]

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, ...

Ashourian, Paymon

2011-01-01T23:59:59.000Z

259

Aging considerations for PWR (pressurized water reactor) control rod drive mechanisms and reactor internals  

SciTech Connect (OSTI)

This paper describes age-related degradation mechanisms affecting life extension of pressurized water reactor control rod drive mechanisms and reactor internals. The major sources of age-related degradation for control rod drive mechanisms are thermal transients such as plant heatups and cooldowns, latchings and unlatchings, long-term aging effects on electrical insulation, and the high temperature corrosive environment. Flow induced loads, the high-temperature corrosive environment, radiation exposure, and high tensile stresses in bolts all contribute to aging related degradation of reactor internals. Another problem has been wear and fretting of instrument guide tubes. The paper also discusses age-related failures that have occurred to date in pressurized water reactors.

Ware, A.G.

1988-01-01T23:59:59.000Z

260

The Effects of Healthy Adult Aging on Recognition Memory and Performance on Tests That Rely on Frontal and Medial Temporal Lobe Function: Evidence Contradicting The DPHMA.   

E-Print Network [OSTI]

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 ...

Fagan, Stephanie

2009-07-03T23:59:59.000Z

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Development of Biomarkers Based on Diet-Dependent Metabolic Serotypes: Practical Issues in Development of Expert System-Based Classification Models in Metabolomic Studies  

E-Print Network [OSTI]

Dietary restriction (DR)-induced changes in the serum metabolome may be biomarkers for physiological status (e.g., relative risk of developing age-related diseases such as cancer). Megavariate analysis (unsupervised ...

Shi, Honglian; Paolucci, Ugo; Vigneau-Callahan, Karen E.; Milbury, Paul E.; Matson, Wayne R.; Kristal, Bruce S.

2004-01-01T23:59:59.000Z

262

Institute for Critical Technology and Applied Science  

E-Print Network [OSTI]

. General & Age Related Disabilities Engineering Program (GARDE), 2. CBET-National Robotics Initiative (NRIProfessorinMechanical,MaterialsandAerospaceEngineeringattheUniversityofCentralFlorida(UCF) in Orlando, FL. Before arriving at UCF, he accepted the tenure-track position of Assistant Professor

Crawford, T. Daniel

263

E-Print Network 3.0 - antioxidant ginkgo biloba Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ginkgo biloba Search Powered by Explorit Topic List Advanced Search Sample search results for: antioxidant ginkgo biloba Page: << < 1 2 3 4 5 > >> 1 Prevention of age-related...

264

SirT1 regulates bone mass in vivo through regulation of osteoblast and osteoclast differentiation  

E-Print Network [OSTI]

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 ...

Zainabadi, Kayvan

2009-01-01T23:59:59.000Z

265

Regulation of Endothelial Phenotype in Rat Soleus Muscle Feed Arteries: Influence of Aging and Exercise Training  

E-Print Network [OSTI]

ameliorates this impairment in endothelial function. Therefore in these series of studies we sought to test three major hypotheses: 1) That exercise training reverses age-related decrements in endothelium-dependent dilation in SFA and that this improved...

Trott, Daniel Wayne

2012-02-14T23:59:59.000Z

266

The characterization of human [gamma]D-crystallin mutants and their differential interactions with the lens chaperone [alpha]B-crystallin  

E-Print Network [OSTI]

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 ...

Moreau, Kate L. (Kate Lauren)

2011-01-01T23:59:59.000Z

267

An evaluation of the impacts of aging on skeletal muscle performance in several mammalian divers  

E-Print Network [OSTI]

caused by increased buoyancy and decreased aerobic dive limit become apparent. The model also addresses the idea that behavioral plasticity may allow older animals to compensate for age-related performance constraints....

Hindle, Allyson Gayle

2009-05-15T23:59:59.000Z

268

Tryptophan Cluster Protects Human ?D-Crystallin from Ultraviolet Radiation-Induced Photoaggregation  

E-Print Network [OSTI]

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

269

Risk factors for cognitive decline in older people with type 2 diabetes   

E-Print Network [OSTI]

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. ...

Feinkohl, Insa

2014-07-05T23:59:59.000Z

270

PHYSICAL REVIEW A 87, 012703 (2013) Feshbach-molecule formation in a Bose-Fermi mixture  

E-Print Network [OSTI]

-degenerate Fermi gas of polar molecules would be an important step toward achieving novel quantum phases of matter molecules with a conversion efficiency as high as 45%. In the limit of fast magnetic sweeps and small of bosonic molecules from either Bose or Fermi gases. However, for quantum degenerate atom gas mixtures, we

Jin, Deborah

271

Addendum: Symmetries of the energy-momentum tensor  

E-Print Network [OSTI]

In recent papers [1-3], we have discussed matter symmetries of non-static spherically symmetric spacetimes, static plane symmetric spacetimes and cylindrically symmetric static spacetimes. These have been classified for both cases when the energy-momentum tensor is non-degenerate and also when it is degenerate. Here we add up some consequences and the missing references about the Ricci tensor.

M. Sharif

2004-10-28T23:59:59.000Z

272

White dwarf mergers,White dwarf mergers, thermonuclear supernovae,thermonuclear supernovae,  

E-Print Network [OSTI]

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

Hinton, Jim

273

On a HeleShaw type domain evolution with convected surface energy density  

E-Print Network [OSTI]

generalizes surface­tension driven Hele­Shaw flow to the case of non­ constant surface tension coe#cient taken the surface tension coe#cient degenerates. The problem is reformulated as a vector­valued, degenerate variations of the surface energy density (corresponding to the surface tension coe#cient #) on surface

Eindhoven, Technische Universiteit

274

Is the central binary system of the planetary nebula Henize 2-428 a Type Ia supernova progenitor?  

E-Print Network [OSTI]

We account for recent observations of the binary system at the center of the bipolar planetary nebula Henize 2-428 by the presence of one degenerate core with a low-mass main sequence companion, rather than by two degenerate objects. We argue that the variability of the He II 5412A spectral line can be accounted for by a time-varying broad absorption line from the central star on top of which there is a time-varying narrow emission line from the compact nebula. The two (almost) symmetric broad minima in the light curve are attributed to tidal distortion caused by a companion. We find problems in the recently proposed and competing explanation of two equal-mass degenerate objects that supposedly will eventually merge, possibly leading to a SN Ia. We conclude that Henize 2-428 cannot be claimed yet to support the double-degenerate scenario for Type Ia supernovae.

Garcia-Berro, Enrique; Althaus, Leandro G

2015-01-01T23:59:59.000Z

275

Radial Glial Cell Line C6-R Integrates Preferentially in Adult White Matter and Facilitates Migration of Coimplanted Neurons in Vivo  

E-Print Network [OSTI]

larger volume than neurons alone or neurons coimplanted with fibro- blasts. In brains preinjured migration that may facilitate development of experimental models for neural trans- plantation cerebrovascular disease, degenerative dementias, cerebellar degeneration, and traumatic injuries of the head

Fischer, Itzhak

276

Computational regulatory genomics : motifs, networks, and dynamics  

E-Print Network [OSTI]

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 ...

Kheradpour, Pouya

2012-01-01T23:59:59.000Z

277

Construction BKW en fonds de puits, cas particuliers (Schrodinger, Dirac avec champ  

E-Print Network [OSTI]

Construction BKW en fonds de puits, cas particuliers (Schr¨odinger, Dirac avec champ magn clefs: semi­classique, puits ponctuel non d'eg'en'er'e, construction BKW , distance d'Agmon, Schr

278

A collagen based scaffold for the repair of annulus fibrosus defects  

E-Print Network [OSTI]

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 ...

Saad, Leonide C. (Leonide Camile), 1977-

2007-01-01T23:59:59.000Z

279

Tunnel determinants from spectral zeta functions. Instanton effects in quantum mechanics  

SciTech Connect (OSTI)

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.

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

280

E-Print Network 3.0 - american pna pattern Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Organization Tailoring the activity of restriction endonuclease PleI by PNA-induced DNA looping Ekaterina... of PleI: it produces a nick near the degenerate site. The PNA-...

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Plasmon decay to a neutrino pair via neutrino electromagnetic moments in a strongly magnetized medium  

E-Print Network [OSTI]

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.

A. V. Borisov; P. E. Sizin

2014-06-12T23:59:59.000Z

282

alpha beta gamma: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

the decoupling limit, M2A0 gg M2Z, the heavy CP-even, CP-odd and charged Higgs boson masses are nearly degenerate, sin(beta-alpha) approaches 1, and the...

283

In-vivo cartilage contact biomechanics : an experimental and computational investigation of human ankle joint complex  

E-Print Network [OSTI]

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 ...

Wan, Lu, Ph. D. Massachusetts Institute of Technology

2008-01-01T23:59:59.000Z

284

Sphericity determination using resonant ultrasound spectroscopy  

DOE Patents [OSTI]

A method is provided for grading production quantities of spherical objects, such as roller balls for bearings. A resonant ultrasound spectrum (RUS) is generated for each spherical object and a set of degenerate sphere-resonance frequencies is identified. From the degenerate sphere-resonance frequencies and known relationships between degenerate sphere-resonance frequencies and Poisson's ratio, a Poisson's ratio can be determined, along with a 'best' spherical diameter, to form spherical parameters for the sphere. From the RUS, fine-structure resonant frequency spectra are identified for each degenerate sphere-resonance frequency previously selected. From each fine-structure spectrum and associated sphere parameter values an asphericity value is determined. The asphericity value can then be compared with predetermined values to provide a measure for accepting or rejecting the sphere. 14 figs.

Dixon, R.D.; Migliori, A.; Visscher, W.M.

1994-10-18T23:59:59.000Z

285

Geminate and non-geminate recombination of triplet excitons formed by singlet fission  

E-Print Network [OSTI]

fis- sion material would ideally have degenerate singlet and triplet-pair states. However, with this energy level con- figuration, the inverse process of singlet fission - triplet- triplet annihilation - becomes a possible recombination pathway...

Bayliss, Sam L.; Chepelianskii, Alexei D.; Sepe, Alessandro; Walker, Brian J.; Ehrler, Bruno; Bruzek, Matthew J.; Anthony, John E.; Greenham, Neil C.

2014-07-04T23:59:59.000Z

286

Effects of lactose and mode of sterilization of a lactose diet on mineral metabolism in germ-free  

E-Print Network [OSTI]

p. 100 of lactose (L). The diet was sterilized either by irradiation (I) or by autoclave (Au. These substances affect food intake, reduce nitrogen digestion and cause hepatic degeneration, renal hypertrophy

Paris-Sud XI, Université de

287

Two-dimensional ultrafast pulse shaping and its application to coherent control and spectroscopy  

E-Print Network [OSTI]

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 ...

Vaughan, Joshua Charles

2005-01-01T23:59:59.000Z

288

From Nonlinear PDEs to Singular ODEs University of Bath, Department of Mathematical Sciences, Bath, BA 27 AY, UK  

E-Print Network [OSTI]

) which is a model for the temperature profile of a fusion reactor plasma with one source term [15]. We that the equation (1) degenerates at the boundary if > 0. This does not affect the calculation of blow-up however

Burton, Geoffrey R.

289

From Nonlinear PDEs to Singular ODEs University of Bath, Department of Mathematical Sciences, Bath, BA 27 AY, UK  

E-Print Network [OSTI]

) which is a model for the temperature profile of a fusion reactor plasma with one source term [15]. We]. Note that the equation (1) is degenerated at the boundary if > 0. This does not affect the calculation

Weinmüller, Ewa B.

290

Uniaxial strain in graphene by Raman spectroscopy: G peak splitting, Grüneisen parameters, and sample orientation  

E-Print Network [OSTI]

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 ...

Mohiuddin, T. M. G.

291

RESEARCH STATEMENT My research objective is the experimental exploration of the Standard Model (SM) of  

E-Print Network [OSTI]

flavor eigenstates (e, , ) in both atmospheric and solar neutrinos, implying non-degenerate mass of the muon outer veto (OV) and tracker for both near and far detectors. The OV modules are vital

292

High-Performance Single Layered WSe2 p-FETs with Chemically Doped Contacts  

E-Print Network [OSTI]

by using high work function Pd contacts along with degenerate surface doping of the contacts by patterned by the gate electrode.3 For sub-5 nm gate lengths, this corresponds to channel materials with only 1-2 atomic

California at Irvine, University of

293

A study of serum proteins from horses infected with equine infectious anemia virus  

E-Print Network [OSTI]

to be anothe. protein c. omponent which increased in the blood during pyrexia periods of' EIA, and appar- ently caused degeneration and destruction of reticulo- endothelial system (RES) cells (6 5). It should. 'oe mentionec hat certain patnologic fac- tors...

Folks, Thomas Murill

1972-01-01T23:59:59.000Z

294

acoustic electron spin resonance: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of electrons with spin-up and electrons with spin-down. In terms of new model we consider propagation of waves in magnetized plasmas of degenerate electrons and motionless ions. We...

295

Experiments with interacting Bose and Fermi gases  

E-Print Network [OSTI]

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 ...

Stan, Claudiu Andrei

2005-01-01T23:59:59.000Z

296

Inhibiting heat-shock protein 90 reverses sensory hypoalgesia in diabetic mice  

E-Print Network [OSTI]

Increasing the expression of Hsp70 (heat-shock protein 70) can inhibit sensory neuron degeneration after axotomy. Since the onset of DPN (diabetic peripheral neuropathy) is associated with the gradual decline of sensory ...

Urban, Michael Joseph; Li, Chengyuan; Yu, Cuijuan; Lu, Yuanming; Krise, Joanna M.; McIntosh, Michelle P.; Rajewski, Roger A.; Blagg, Brian S. J.; Dobrowsky, Rick T.

2010-07-14T23:59:59.000Z

297

Symmetries of the Energy-Momentum Tensor of Spherically Symmetric Lorentzian Manifolds  

E-Print Network [OSTI]

Matter collineations of spherically Symmetric Lorentzian Manifolds are considered. These are investigated when the energy-momentum tensor is non-degenerate and also when it is degenerate. We have classified spacetimes admitting higher symmetries and spacetimes admitting SO(3) as the maximal isometry group. For the non-degenerate case, we obtain either {\\it four}, {\\it six}, {\\it seven} or {\\it ten} independent matter collineations in which {\\it four} are isometries and the rest are proper. The results of the previous paper [1] are recovered as a special case. It is worth noting that we have also obtained two cases where the energy-momentum tensor is degenerate but the group of matter collineations is finite-dimensional, i.e. {\\it four} or {\\it ten}.

M. Sharif

2003-07-29T23:59:59.000Z

298

Holographic Neutron Stars  

E-Print Network [OSTI]

We construct in the context of the AdS/CFT correspondence degenerate composite operators in the conformal field theory that are holographically dual to degenerate stars in anti de Sitter space. We calculate the effect of the gravitational back-reaction using the Tolman-Oppenheimer-Volkoff equations, and determine the "Chandrasekhar limit" beyond which the star undergoes gravitational collapse towards a black hole.

Jan de Boer; Kyriakos Papadodimas; Erik Verlinde

2009-07-16T23:59:59.000Z

299

Quantum dynamics and macroscopic quantum tunneling of two weakly coupled condensates  

E-Print Network [OSTI]

We study the quantum dynamics of a Bose Josephson junction(BJJ) made up of two coupled Bose-Einstein condensates. Apart from the usual ac Josephson oscillations, two different dynamical states of BJJ can be observed by tuning the inter-particle interaction strength, which are known as '$\\pi$-oscillation' with relative phase $\\pi$ between the condensates and 'macroscopic self-trapped' (MST) state with finite number imbalance. By choosing appropiate intial state we study above dynamical branches quantum mechanically and compare with classical dynamics. The stability region of the '$\\pi$-oscillation' is separated from that of 'MST' state at a critical coupling strength. Also a significant change in the energy spectrum takes place above the critical coupling strength, and pairs of (quasi)-degenerate excited states appear. The original model of BJJ can be mapped on to a simple Hamiltonian describing quantum particle in an 'effective potential' with an effective Planck constant. Different dynamical states and degenerate excited states in the energy spectrum can be understood in this 'effective potential' approach. Also possible novel quantum phenomena like 'macroscopic quantum tunneling'(MQT) become evident from the simple picture of 'effective potential'. We study decay of metastable '$\\pi$-oscillation' by MQT through potential barrier. The doubly degenerate excited states in the energy spectrum are associated with the classically degenerate MST states with equal and opposite number imbalance. We calculate the energy splitting between these quasi-degenerate excited states due to MQT of the condensate between classically degenerate MST states.

René John Kerkdyk; S. Sinha

2012-09-24T23:59:59.000Z

300

Regulatory instrument review: Aging management of LWR cables, containment and basemat, reactor coolant pumps, and motor-operated valves  

SciTech Connect (OSTI)

The results of Stage 2 of the Regulatory Instrument Review are presented in this volume. Selected regulatory instruments, such as the Code of Federal Regulations (CFR), US Nuclear Regulatory Commission (NRC), Regulatory Guides, and ASME Codes, were investigated to determine the extent to which these regulations apply aging management to selected safety-related components in nuclear power plants. The Regulatory Instrument Review was funded by the NRC under the Nuclear Plant Aging Research (NPAR) program. Stage 2 of the review focused on four safety-related structures and components; namely, cables, containment and basemat, reactor coolant pumps, and motor-operated valves. The review suggests that the primary-emphasis of the regulatory instruments was on the design, construction, start-up, and operation of a nuclear power plant, and that aging issues were primarily addressed after an aging-related problem was recognized. This Stage 2 review confirms the results of the prior review; (see Regulatory Instrument Review: Management of Aging of LWR Major Safety-Related Components NUREG/CR-5490. The observations indicate that the regulations generally address management of age-related degradation indirectly. Specific age-related degradation phenomena frequently are dealt with in bulletins and notices or through generic issues, letters, etc. The major recommendation of this report, therefore, is that the regulatory instruments should more directly and explicitly address the aging phenomenon and the management of the age-related degradation process.

Werry, E.V.; Somasundaram, S.

1995-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

January 2012 1 Doctoral Students' Research  

E-Print Network [OSTI]

., Ph.D., East Carolina University, 2011, 264 pages; AAT 3456453. Vestibular function following blast injury. Mills, Kristal N., Ph.D., East Carolina University, 2011, 274 pages; AAT 3468722. The effects sensory systems in mouse models of age-related hearing loss by Mock, Bruce E., Ph.D., East Carolina

302

The Cognitive Aging and Neuroimaging (CAN) Lab The Cognitive Aging and Neuroimaging (CAN)Lab investigates the development of both cognitive and neural processes associated  

E-Print Network [OSTI]

The Cognitive Aging and Neuroimaging (CAN) Lab Overview: The Cognitive Aging and Neuroimaging (CAN)Lab investigates the development of both cognitive and neural processes associated with aging -with a focus on ageMRI to elucidate the cognitive and neural processes underlying age-related differences in cognitive control

Bjørnstad, Ottar Nordal

303

COM: A Method for Mining and Monitoring Human Activity Patterns in Home-based Health Monitoring Systems  

E-Print Network [OSTI]

for the health care system due to the shortage of health care professionals and health care facilities. To remedy population in the coming decades will result in many complications for families, society and the government, such as the shortage of health care professionals and care facilities, an increase in age related diseases and rising

Cook, Diane J.

304

Cognitive Reserve and Alzheimer Disease Yaakov Stern, PhD  

E-Print Network [OSTI]

that individual differences in how tasks are processed provide differential reserve against brain pathology or age-related changes. This may take 2 forms. In neural reserve, preexisting brain networks that are more efficient of reserve against brain damage stems from the repeated observation that there does not seem to be a direct

305

What is presbyopia? Presbyopia is a common type of vision disorder  

E-Print Network [OSTI]

the age of 40 to check for age-related conditions. How is presbyopia corrected? Eyeglasses are the simplest and safest means of correcting presbyopia. Eyeglasses for presbyopia have higher focusing power distant objects through the upper portion of the lens. It is also possible to purchase reading eyeglasses

Bandettini, Peter A.

306

COMMUNICATION TO THE EDITOR Increased Resistance to Oxysterol Cytotoxicity in  

E-Print Network [OSTI]

,2 Pedro J. Alvarez1 1 Department of Environmental Engineering, Rice University, Houston, Texas 77005; telephone: 713-348-5187; fax: 713-348-5268; e-mail: mathieu@rice.edu 2 Department of Chemical- sterol that plays a role in many age-related degenerative diseases. 7KC formation and accumulation often

Alvarez, Pedro J.

307

et al. (2008) identified several additional methylation sites on FOXO1 that ap-  

E-Print Network [OSTI]

, it remains to be deter- mined how methylation alters the activity and posttranslational regulation. In this light, methylation could, therefore, play a very general role in the regulation of FOXO1 activity serve as a link between aging and age-related diseases such as diabe- tes and cancer. FOXO dysregulation

Hertel, Klemens J.

308

Cerebral White Matter Integrity Mediates Adult Age Differences in Cognitive Performance  

E-Print Network [OSTI]

Cerebral White Matter Integrity Mediates Adult Age Differences in Cognitive Performance David J. Madden1 , Julia Spaniol1 , Matthew C. Costello1 , Barbara Bucur1 , Leonard E. White1 , Roberto Cabeza2 research has established that age-related decline oc- curs in measures of cerebral white matter integrity

Dennis, Nancy

309

Why do seizures occur when they do? Situations perceived to be associated with increased or decreased seizure likelihood in people withepilepsy and intellectual disability  

E-Print Network [OSTI]

, Pascotto A, et al. Polysomnographic findings in Rett syndrome: a case–control study. Sleep Breath 2013;17:93–8. [46] Ellaway C, Peat J, Leonard H, Christodoulou J. Sleep dysfunction in Rett syndrome: lack of age related decrease in sleep duration. Brain Dev...

Illingworth, Josephine L.; Watson, Peter; Ring, Howard

2014-09-16T23:59:59.000Z

310

Ann. N.Y. Acad. Sci. ISSN 0077-8923 ANNALS OF THE NEW YORK ACADEMY OF SCIENCES  

E-Print Network [OSTI]

in Cognitive Neuroscience The emotion paradox in the aging brain Mara Mather The USC Davis School Mather, Ph.D., The USC Davis School of Gerontology, University of Southern California, 3715 Mc questions about which aspects of these age-related changes in emotional processing can be accounted

Mather, Mara

311

ORIGINAL ARTICLE A theoretical analysis of the relative influences of peak BMD,  

E-Print Network [OSTI]

loss and menopause on the development of osteoporosis C.J. Hernandez Æ G.S. Beaupre´ Æ D.R. Carter Osteoporosis Foundation and National Osteoporosis Foundation 2003 Abstract Factors that determine a post-menopausal the relative influences of peak BMD, menopause and age- related bone loss on the development of osteoporosis

Stanford University

312

Asymptotic properties of linear field equations in anti-de Sitter space  

E-Print Network [OSTI]

We study the global dynamics of the wave equation, Maxwell's equation and the linearized Bianchi equations on a fixed anti-de Sitter (AdS) background. Provided dissipative boundary conditions are imposed on the dynamical fields we prove uniform boundedness of the natural energy as well as both degenerate (near the AdS boundary) and non-degenerate integrated decay estimates. Remarkably, the non-degenerate estimates "lose a derivative". We relate this loss to a trapping phenomenon near the AdS boundary, which itself originates from the properties of (approximately) gliding rays near the boundary. Using the Gaussian beam approximation we prove that non-degenerate energy decay without loss of derivatives does not hold. As a consequence of the non-degenerate integrated decay estimates, we also obtain pointwise-in-time decay estimates for the energy. Our paper provides the key estimates for a proof of the non-linear stability of the anti-de Sitter spacetime under dissipative boundary conditions. Finally, we contras...

Holzegel, Gustav; Smulevici, Jacques; Warnick, Claude

2015-01-01T23:59:59.000Z

313

Two-dimensional cylindrical ion-acoustic solitary and rogue waves in ultrarelativistic plasmas  

SciTech Connect (OSTI)

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.

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

314

Modulation of drift-wave envelopes in a nonuniform quantum magnetoplasma  

SciTech Connect (OSTI)

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.

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

315

A mathematical perspective on density functional perturbation theory  

E-Print Network [OSTI]

In this article, we provide a mathematical analysis of the perturbation method for extended Kohn-Sham models, in which fractional occupation numbers are allowed. All our results are established in the framework of the reduced Hartree-Fock (rHF) model, but our approach can be used to study other kinds of extended Kohn-Sham models, under some assumptions on the mathematical structure of the exchange-correlation functional. The classical results of Density Functional Perturbation Theory in the non-degenerate case (that is when the Fermi level is not a degenerate eigenvalue of the mean-field Hamiltonian) are formalized, and a proof of Wigner's (2n + 1) rule is provided. We then focus on the situation when the Fermi level is a degenerate eigenvalue of the rHF Hamiltonian, which had not been considered so far.

Eric Cancès; Nahia Mourad

2014-05-06T23:59:59.000Z

316

Relativistic harmonic oscillator model for quark stars  

E-Print Network [OSTI]

The relativistic harmonic oscillator (RHO) model of hadrons is used to study quark stars. The mass-radius relationship is obtained and compared with bag model of quark star, using Tolman-Oppenheimer-Volkoff equation. In this model, the outward degenerate pressure due to discrete Landau levels and Landau degeneracy balances the inward gravitational pressure. Where as in bag model the degenerate pressure is due to the standard continuum levels which balances the combined inward pressure due to gravitation and bag pressure. So in RHO model, the confinement effect is included in the degenerate pressure. We found a qualitative similarity, but quantitative differences in mass-radius relationship of quark stars in these two models. Masses and radii are relatively larger and the central energy densities, required for stable quark stars, are lower in RHO model than that of bag model.

Vishnu M. Bannur

2008-10-06T23:59:59.000Z

317

Two-loop Yang-Mills diagrams from superstring amplitudes  

E-Print Network [OSTI]

Starting from the superstring amplitude describing interactions among D-branes with a constant world-volume field strength, we present a detailed analysis of how the open string degeneration limits reproduce the corresponding field theory Feynman diagrams. A key ingredient in the string construction is represented by the twisted (Prym) super differentials, as their periods encode the information about the background field. We provide an efficient method to calculate perturbatively the determinant of the twisted period matrix in terms of sets of super-moduli appropriate to the degeneration limits. Using this result we show that there is a precise one-to-one correspondence between the degeneration of different factors in the superstring amplitudes and one-particle irreducible Feynman diagrams capturing the gauge theory effective action at the two-loop level.

Magnea, Lorenzo; Russo, Rodolfo; Sciuto, Stefano

2015-01-01T23:59:59.000Z

318

Efficient all-optical production of large $^6$Li quantum gases using D$_1$ gray-molasses cooling  

E-Print Network [OSTI]

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.

A. Burchianti; G. Valtolina; J. A. Seman; E. Pace; M. De Pas; M. Inguscio; M. Zaccanti; G. Roati

2014-06-18T23:59:59.000Z

319

High-resolution inverse Raman and resonant-wave-mixing spectroscopy  

SciTech Connect (OSTI)

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).

Rahn, L.A. [Sandia National Laboratories, Livermore, CA (United States)

1993-12-01T23:59:59.000Z

320

Study of stopping power for a proton moving in a plasma with arbitrary degeneracy  

SciTech Connect (OSTI)

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.

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

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Quantum effects in electron beam pumped GaAs  

SciTech Connect (OSTI)

Propagation of waves in nano-sized GaAs semiconductor induced by electron beam are investigated. A dispersion relation is derived by using quantum hydrodynamics equations including the electrons and holes quantum recoil effects, exchange-correlation potentials, and degenerate pressures. It is found that the propagating modes are instable and strongly depend on the electron beam parameters, as well as the quantum recoil effects and degenerate pressures. The instability region shrinks with the increase of the semiconductor number density. The instability arises because of the energetic electron beam produces electron-hole pairs, which do not keep in phase with the electrostatic potential arising from the pair plasma.

Yahia, M. E. [Faculty of Engineering, The British University in Egypt (BUE), El-Shorouk City, Cairo (Egypt) [Faculty of Engineering, The British University in Egypt (BUE), El-Shorouk City, Cairo (Egypt); National Institute of Laser Enhanced Sciences (NILES), Cairo University (Egypt); Azzouz, I. M. [National Institute of Laser Enhanced Sciences (NILES), Cairo University (Egypt)] [National Institute of Laser Enhanced Sciences (NILES), Cairo University (Egypt); Moslem, W. 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)

2013-08-19T23:59:59.000Z

322

Method for resonant measurement  

DOE Patents [OSTI]

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.

Rhodes, George W. (5201 Rio Grande Blvd., N.W., Albuquerque, NM 87107); Migliori, Albert (Rte. 4, Box 258 Tano Rd., Sante Fe, NM 87501); Dixon, Raymond D. (396 Connie Ave., White Rock, NM 87544)

1996-01-01T23:59:59.000Z

323

Level Structure of 103Ag at high spins  

E-Print Network [OSTI]

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

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

324

Gravitational Phase Transition of Heavy Neutrino Matter  

E-Print Network [OSTI]

We study the phase transition of a system of self-gravitating neutrinos in the presence of a large radiation density background in the framework of the Thomas-Fermi model. We show that, by cooling a non-degenerate gas of massive neutrinos below some critical temperature, a condensed phase emerges, consisting of quasi-degenerate supermassive neutrino stars. These compact dark objects could play an important role in structure formation in this universe, as they might in fact provide the seeds for galactic nuclei and quasi-stellar objects.

Neven Bilic; Raoul D. Viollier

1996-07-16T23:59:59.000Z

325

The effect of dinitrophenol on the development and oxidative metabolism of the chick embryo  

E-Print Network [OSTI]

degeneration and liquefaction of the lens proteins. Small focal areas of degeneration -were observed in the cortex of the lens and were considered as Morgagni bodies (Figure 4 ) 0 In addition to the degenerative changes, there was an apparent movement..., and 1000 meg . 5 and those injected on the fifteenth day received 750 and 1000 meg, of the drug respectively. The eggs were prepared for injection by painting a small area over the air cell of the egg with tincture of merthiolate. A small hole was 6...

Feldman, Gerald Lewis

1959-01-01T23:59:59.000Z

326

What role does the third law of thermodynamics play in Szilard engines?  

E-Print Network [OSTI]

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.

Kang-Hwan Kim; Sang Wook Kim

2011-12-14T23:59:59.000Z

327

Image analysis of ocular fundus for retinopathy characterization  

SciTech Connect (OSTI)

Automated analysis of ocular fundus images is a common procedure in countries as England, including both nonemergency examination and retinal screening of patients with diabetes mellitus. This involves digital image capture and transmission of the images to a digital reading center for evaluation and treatment referral. In collaboration with the Optometry Department, University of California, Berkeley, we have tested computer vision algorithms to segment vessels and lesions in ground-truth data (DRIVE database) and hundreds of images of non-macular centric and nonuniform illumination views of the eye fundus from EyePACS program. Methods under investigation involve mathematical morphology (Figure 1) for image enhancement and pattern matching. Recently, we have focused in more efficient techniques to model the ocular fundus vasculature (Figure 2), using deformable contours. Preliminary results show accurate segmentation of vessels and high level of true-positive microaneurysms.

Ushizima, Daniela; Cuadros, Jorge

2010-02-05T23:59:59.000Z

328

Nondestructive ultrasonic testing of materials  

DOE Patents [OSTI]

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.

Hildebrand, Bernard P. (Richland, WA)

1994-01-01T23:59:59.000Z

329

Trends in modeling Biomedical Complex Systems  

E-Print Network [OSTI]

contributed to the understand- ing of specific aspects of the disease process and to the development of diagnostic and prognostic clinical applications. Cardiovascular obesity, diabetes, autoim- mune diseases, and neurodegenerative disorders are some... intelligence, are inherently multifactor- ial, and also many common diseases, such as type-2 diabetes, obesity, asthma, cancers, mental retardation aging related diseases, cardiovascular diseases and obesity, tend to be multifactorial. As an example of complex...

2009-10-15T23:59:59.000Z

330

Nondestructive ultrasonic testing of materials  

DOE Patents [OSTI]

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.

Hildebrand, B.P.

1994-08-02T23:59:59.000Z

331

10 OCTOBER 2008 VOL 322 SCIENCE www.sciencemag.org204 PERSPECTIVES  

E-Print Network [OSTI]

Bose- Einstein condensate or degenerate Fermi gas of molecules. Such systems will prove useful-to-tail attract; side-by-side they repel. So, for example, a confined pancake- shaped sample will tend in exploring exotic quantum phases of matter and performing quantum simulations of highly correlated condensed

Rogers, Sean M.

332

arXiv:1108.3866v1[physics.atom-ph]18Aug2011 Universalities in ultracold reactions of alkali polar molecules  

E-Print Network [OSTI]

statistics plays a strong role. An ultracold gas of bosonic molecules can lead to Bose-Einstein condensation and an ultracold sample of fermionic molecules can lead to a Degenerate Fermi gas. Thirdly, two polar molecules can University, 198904, Russia interactions in a gas and depends strongly on the ap- plied electric field [16

Kotochigova, Svetlana

333

VOLUME 84, NUMBER 17 P H Y S I C A L R E V I E W L E T T E R S 24 APRIL 2000 Bose-Stimulated Raman Adiabatic Passage in Photoassociation  

E-Print Network [OSTI]

a degenerate molecular gas (MBEC) from an already Bose-condensed sample of atoms [4­6]. Photoassociation (PA two-color photoassociation of a Bose-Einstein condensate, focusing on stimulated Raman adiabatic element for an atomic condensate, and photoassociative STIRAP turns out to be a viable mechanism

Javanainen, Juha

334

ccsd00000540 Production of Long-Lived Ultracold Li 2 Molecules from a Fermi gas  

E-Print Network [OSTI]

and sign of the scattering length. In bosonic samples, the collapse of Bose-Einstein condensates (BEC a Fermi gas J. Cubizolles 1 , T. Bourdel 1 , S. J. J. M. F. Kokkelmans 1 , G.V. Shlyapnikov 1;2;3 and C-bound Li2 molecules from a degenerate two component Fermi gas by sweeping a magnetic #12;eld across

335

ccsd-00000540(version1):1Aug2003 Production of Long-Lived Ultracold Li2 Molecules from a Fermi gas  

E-Print Network [OSTI]

samples, the collapse of Bose-Einstein condensates (BEC) for negative scattering length [4], solitonccsd-00000540(version1):1Aug2003 Production of Long-Lived Ultracold Li2 Molecules from a Fermi gas a degenerate two component Fermi gas by sweeping a magnetic field across a Feshbach resonance. The atom

Paris-Sud XI, Université de

336

Making ultracold molecules in a two-color pump-dump photoassociation scheme using chirped pulses  

E-Print Network [OSTI]

formed in a degenerate gas, starting either from an atomic Bose-Einstein condensate 2­6 or from an atomic groups are working at the production of dense samples of cold T 1 K or ultracold T 100 K mol- ecules 1 . Moreover, the field of molecular condensates has opened recently, with experimental evidence for molecules

Koch, Christiane

337

167Y.V. Li and J.H. Zhang (eds.), Metal Ion in Stroke, Springer Series in Translational Stroke Research, DOI 10.1007/978-1-4419-9663-3_7,  

E-Print Network [OSTI]

167Y.V. Li and J.H. Zhang (eds.), Metal Ion in Stroke, Springer Series in Translational Stroke zinc load can be a precursor for cell death and sub- sequent brain degeneration following a stroke-mediated toxic effect. Therefore, an effective therapeutic strategy for stroke may be a combined treatment

Li, Yang V.

338

Neutrinoless double beta decay  

E-Print Network [OSTI]

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\

Petr Vogel

2006-11-17T23:59:59.000Z

339

HIGH-RESOLUTION FINITE VOLUME METHODS FOR DUSTY GAS JETS AND MARICA PELANTI AND RANDALL J. LEVEQUE  

E-Print Network [OSTI]

(since the sound speed is zero in the absence of pressure) and have a degenerate structure in which delta is lower than the sound speed of the pure gas phase, and can be substantially lower at high dust densities" (though in some contexts it could represent liquid droplets) and the mixture as a "dusty gas". Dusty gas

LeVeque, Randy

340

SIAM J. SCI. COMPUT. c 2006 Society for Industrial and Applied Mathematics Vol. 28, No. 4, pp. 13351360  

E-Print Network [OSTI]

are nonstrictly hyperbolic (since the sound speed is zero in the absence of pressure) and have a degenerate of sound in the dusty gas is lower than the sound speed of the pure gas phase and can be substantially to the particulate phase as "dust" (though in some contexts it could represent liquid droplets) and to the mixture

LeVeque, Randy

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

CHANGES IN THE ORTHODROMIC AND ANTI-DROMIC RESPONSE OF OPTIC TRACT DURING  

E-Print Network [OSTI]

CHANGES IN THE ORTHODROMIC AND ANTI- DROMIC RESPONSE OF OPTIC TRACT DURING THE EYE MOVEMENTS photocoagulation of the optic disc or enuclea- tion of the eyes, these geniculate slow waves persist unmodified the time course of wave disappearance correlates precisely with the time course of optic nerve degeneration

Bizzi, Emilio

342

Neutral Color Superconductivity and Pseudo-Goldstone Modes  

E-Print Network [OSTI]

Four of the five expected Goldstone modes, which will be eaten up by gauge fields, in neutral two-flavor color superconductor are actually pseudo-Goldstone modes, and their degenerated mass is exactly the magnitude of the color chemical potential, which is introduced to guarantee the color neutrality at moderate baryon density.

Lianyi He; Meng Jin; Pengfei Zhuang

2005-05-09T23:59:59.000Z

343

Wan Yusof Wan "Frequency modulation spectroscopy for frequency stabilization of dye  

E-Print Network [OSTI]

.D. thesis 1999 Dallin S. Durfee "Dynamic Properties of Dilute Bose-Einstein Condensates", Ph.D. thesis Dan M Hadzibabic "Studies of a quantum degenerate fermionic lithium gas", Ph.D. thesis Aaron E. Leanhardt", Diploma thesis, University of Heidelberg, Germany 2005 Claudiu Stan "Experiments with Interacting Bose

344

VOLUME 77, NUMBER 3 P H Y S I C A L R E V I E W L E T T E R S 15 JULY 1996 Bose-Einstein Condensation in a Tightly Confining dc Magnetic Trap  

E-Print Network [OSTI]

-statistical nature of the BEC transition is com- plicated by strong interactions [3]. BEC was recently created vapors at JILA and MIT [6,7]. A third group, at Rice University, reported cooling of lithium atoms in the study of quantum- degenerate gases [9]. In this Letter, we report a detailed study of the properties

345

Supersymmetric vertex models with domain wall boundary conditions  

SciTech Connect (OSTI)

By means of the Drinfeld twists, we derive the determinant representations of the partition functions for the gl(1 vertical bar 1) and gl(2 vertical bar 1) supersymmetric vertex models with domain wall boundary conditions. In the homogeneous limit, these determinants degenerate to simple functions.

Zhao Shaoyou; Zhang Yaozhong [Department of Mathematics, University of Queensland, Brisbane, QLD 4072 (Australia); Department of Mathematics, University of Queensland, Brisbane, QLD 4072 (Australia) and Physikalisches Institut, Universitaet Bonn, D-53115 Bonn (Germany)

2007-02-15T23:59:59.000Z

346

Graded multiplicities in the Macdonald kernel, Part I John R. Stembridge  

E-Print Network [OSTI]

Graded multiplicities in the Macdonald kernel, Part I John R. Stembridge Department of Mathematics notation B. Motivation C. Outline 2. Degenerate Macdonald polynomials A. The decomposition matrix B G has a Macdonald kernel associated to it. This kernel is a bigraded virtual G-character depending

Stembridge, John

347

Charge pumping techniques in ultra-low current transconductor design  

E-Print Network [OSTI]

generated by the interface-trap charge pump. An interface-trap charge-pump has been used as an ultra low current source for biasing an operational transconductance amplifier in both single-ended and fully differential configurations. Source degeneration...

Becker-Gomez, Adriana

2002-01-01T23:59:59.000Z

348

0306-4549(94)E0007-Z Ann. Nucl. Energy.Vol. 21, No. 7, pp. 433-439, 1994  

E-Print Network [OSTI]

-backward model in criticality calculations), the observation of * Permanent address: Chemical and Nuclear SLAB CRITICALITY EIGENVALUE LIMITS IN A DISCRETE ANGLE MODEL ANIL K. PRINJA* and IMRE PAZSIT Department- pling between 121 and 122 the critical eigenvalue condition is shown to degenerate

Pázsit, Imre

349

SU(4) Kondo Effect in Carbon Nanotube Quantum Dots: Kondo Effect without Charge Quantization  

E-Print Network [OSTI]

.J. Liang, M. Bockrath, and H. Park, PRL (2002) M. R. Buitelaar et al., PRL (2002) Quantization along length nanotube M.S. Choi, R. Lopez and R. Aguado, PRL (2005) 4 degenerate levels in the dot are coupled one for 1 electron: Double dots, dots with symmetries: D. Boese et al., PRB (2002) L. Borda et al., PRL

Finkelstein, Gleb

350

When Stars Blow Up What Stars Explode?  

E-Print Network [OSTI]

#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

Walter, Frederick M.

351

Histology of the CNS: insights into the neuropathology  

E-Print Network [OSTI]

Disorders · Barth Syndrome · Batten Disease · Cerebellar Degeneration · Colpocephaly · Down Syndrome · Fabry · Adrenoleukodystrophy · Asenesis of the corpus callosum · Aicardia Syndrome · Alzheimer's Disease · Autistic Spectrum's Disease · Fahr's Syndrome · Fragile-X syndrome · Gerstmann-Straussler-Scheinker Disease · Huntington

Gleeson, Joseph G.

352

Molecular Biology of the Cell Vol. 18, 38353844, October 2007  

E-Print Network [OSTI]

phosphorylation of APP is a pathological trait of Alzheimer's disease. APP is overexpressed in Down's syndrome's disease and Down's syndrome--in the context of normal neuronal func- tion and during degeneration and tau (Selkoe, 2001). Patients with Down's syndrome also develop Alzheimer's disease pathology

Muresan, Virgil

353

ORIGINAL ARTICLE Peripheral Neuropathy in Military Aircraft Maintenance  

E-Print Network [OSTI]

; and the gases carbon monoxide, carbon disulfide, and ethylene oxide.1 Two basic forms of damage to peripheral. Axonal degeneration may involve large fibers, with prominent vibratory sense impairment or small fibers with pain and temperature impairment. With remyelination, recovery is rapid and generally complete; however

Boggess, May M.

354

LETTER doi:10.1038/nature12186 Hofstadter's butterfly and the fractal quantum Hall  

E-Print Network [OSTI]

Electrons moving through a spatially periodic lattice potential develop a quantized energy spectrum a quantized energy spectrum, consisting of highly degenerate Landau energy levels. When subject to both emergent behaviour within a fractal energy landscape in a system with tunable internal degrees of freedom

Shepard, Kenneth

355

Contractions of Lie algebras and algebraic groups  

E-Print Network [OSTI]

Degenerations, contractions and deformations of various algebraic structures play an important role in mathematics and physics. There are many different definitions and special cases of these notions. We try to give a general definition which unifies these notions and shows the connections among them. Here we focus on contractions of Lie algebras and algebraic groups.

Dietrich Burde

2007-03-23T23:59:59.000Z

356

APPLIED AND ENVIRONMENTAL MICROBIOLOGY, May 2008, p. 27282739 Vol. 74, No. 9 0099-2240/08/$08.00 0 doi:10.1128/AEM.02199-07  

E-Print Network [OSTI]

in field samples produced with degenerate primers revealed the expression of two putative RDase genes threat to public health when released into water sources. PCE and TCE are among the most fre- quently in the United States (26, 36). A promising solution to remediate chlorinated- ethene-contaminated groundwater

Alvarez-Cohen, Lisa

357

Condensed Matter Theory Center 2011 Fall Symposium  

E-Print Network [OSTI]

Condensed Matter Theory Center 2011 Fall Symposium October 3 & 4, 2011 2205 Physics Building and Collective Modes in Fermionic Condensates with Bragg Scattering" Benjamin Fregoso "Degenerate FloquetEinstein condensates" Tuesday, October 4 Afternoon Session: 25:30pm ChienHung Lin "Stabilizing topological

Lathrop, Daniel P.

358

Prepared for the U.S. Department of Energy under Contract DE-AC02-76CH03073. Princeton Plasma Physics Laboratory  

E-Print Network [OSTI]

Physics Laboratory Controlled Fusion with Hot-ion Mode in a Degenerate Plasma S. Son and N.J. Fisch December 2005 PPPL-4133 PPPL-4133 #12;Princeton Plasma Physics Laboratory Report Disclaimers Full Legal Availability Princeton Plasma Physics Laboratory This report is posted on the U.S. Department of Energy

359

Prepared for the U.S. Department of Energy under Contract DE-AC02-76CH03073. Princeton Plasma Physics Laboratory  

E-Print Network [OSTI]

Physics Laboratory Ignition Regime for Fusion in a Degenerate Plasma S. Son and N.J. Fisch December 2005 PPPL-4138 PPPL-4138 #12;Princeton Plasma Physics Laboratory Report Disclaimers Full Legal Disclaimer Physics Laboratory This report is posted on the U.S. Department of Energy's Princeton Plasma Physics

360

Physics Letters A 356 (2006) 6571 www.elsevier.com/locate/pla  

E-Print Network [OSTI]

of electron physical processes is much reduced from the classical prediction, possibly enabling new regimesPhysics Letters A 356 (2006) 65­71 www.elsevier.com/locate/pla Controlled fusion with hot-ion mode in a degenerate plasma S. Son , N.J. Fisch Department of Astrophysical Sciences, Princeton University, Princeton

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Physics Letters A 356 (2006) 7278 www.elsevier.com/locate/pla  

E-Print Network [OSTI]

Physics Letters A 356 (2006) 72­78 www.elsevier.com/locate/pla Ignition regime for fusion regimes in which aneutronic fuels can undergo fusion ignition in hot-ion degenerate plasma. Because regime, the reduc- tion in e­i collisions relative to classical plasma increases the current drive

362

Stellar Burning Falk Herwig, Alexander Heger, and Frank  

E-Print Network [OSTI]

]. 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

Herwig, Falk

363

GENERAL TECHNICAL REPORT PSW-GTR-245 Land Suitability for Establishing Rainwater  

E-Print Network [OSTI]

harvesting systems (RHS), which describe all methods to concentrate, store and collect rainwater runoff (DeGENERAL TECHNICAL REPORT PSW-GTR-245 304 Land Suitability for Establishing Rainwater Harvesting Rainwater harvesting systems (RHSs) can be used to improve the efficiency of helicopter fire- fighting

Standiford, Richard B.

364

Effect of the Doping Ion on the Electrical Response of a Free-Standing Polypyrrole Strip Subjected to Different Preloads  

E-Print Network [OSTI]

, a degeneration of the electrical energy vs the external stress was measured, which would seriously limit the useEffect of the Doping Ion on the Electrical Response of a Free-Standing Polypyrrole Strip Subjected they are immersed in aqueous solutions with different doping ions. By plotting the electrical energy associated

Otero, Toribio Fernández

365

2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim5540 www.advmat.de  

E-Print Network [OSTI]

by harnessing the nanoscale confinement of light and the nonlinearity of metal. Using a nanostructured gold film absorption, pulse reshaping and self-modulation, limiting, saturable absorption, frequency degenerate four-wave­16] They revealed a range of response mechanisms, from the transient smearing of the elec- tron energy distribution

Zheludev, Nikolay

366

Spin Singlet Formation in MgTi2O4: Evidence of a Helical Dimerization Pattern M. Schmidt,1,2  

E-Print Network [OSTI]

-insulator (M-I) transition on cooling below TM-I 260 K. A sharp reduction of the magnetic susceptibility below can be traced back to the work of Pauling [1] on the frozen disorder of crystalline ice. Frustration with this local geometry, there exists a manifold of degenerate ground states, which may freeze on cooling forming

367

Boundary quantum Knizhnik-Zamolodchikov equations and Bethe vectors  

E-Print Network [OSTI]

Solutions to boundary quantum Knizhnik-Zamolodchikov equations are constructed as bilateral sums involving "off-shell" Bethe vectors in case the reflection matrix is diagonal and only the 2-dimensional representation of $U_q(\\hat{\\frak{sl}(2)})$ is involved. We also consider their rational and classical degenerations.

Nicolai Reshetikhin; Jasper Stokman; Bart Vlaar

2014-07-18T23:59:59.000Z

368

MIT Plasma Fusion Sciences Center IAP Seminar! Jan 10th, 2012!  

E-Print Network [OSTI]

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

369

Critical fields in ferromagnetic thin films: Identification of four regimes  

E-Print Network [OSTI]

Critical fields in ferromagnetic thin films: Identification of four regimes Rub´en Cantero­film elements is a paradigm for a multi­scale pattern­forming system. On one hand, there is a material length functional ceases to be positive definite. The degenerate subspace consists of the "unstable modes

Otto, Felix

370

A low power, high dynamic-range, broadband variable gain amplifier for an ultra wideband receiver  

E-Print Network [OSTI]

gain steps. The gain control scheme includes fine tuning (2dB/step) by changing the bias voltage of the proposed programmable current mirror, and coarse tuning (14dB/step) by switching on/off the source degeneration resistors in the differential pairs...

Chen, Lin

2007-09-17T23:59:59.000Z

371

An Elliptic Problem Arising From the Unsteady Transonic Small Disturbance  

E-Print Network [OSTI]

conservation laws in two space dimensions. The equation is ` (u \\Gamma ae)u ae + u 2 ' ae + u jj = 0; (1 on the degenerate boundary \\Gamma 2 and on \\Gamma 1 , and g = ~ g on \\Gamma 3 , where ~ g â?? ae m is continuous geometrical optics, and also in unsteady transonic flow. Brio and Hunter in [2] use (2) as an asymptotic

Keyfitz, Barbara Lee

372

WHITE DWARFS H. M. Van Horn  

E-Print Network [OSTI]

WHITE DWARFS H. M. Van Horn Department of Physios and Astronomy £ §.£.Kenneth Mees Observatory of matter in the dense, degenerate cores of white dwarfs, together with efficient heat transport through the high-density envelopes of these stars, affect the theoretical white dwarf lu- minosity function

Paris-Sud XI, Université de

373

NEWS & VIEWS nature physics | VOL 2 | AUGUST 2006 | www.nature.com/naturephysics 505  

E-Print Network [OSTI]

TURBULENCE From tea kettlestoexploding stars Turbulent flows, such as those generating the thermonuclear. In thermonuclear supernovae, Rayleigh­Taylor instabilities lead to explosive burning. The reason is that matter in degenerate stars evolving into thermonuclear supernovae expands only very little despite the dramatic

Loss, Daniel

374

Cell-Autonomous Death of Cerebellar Purkinje Neurons with Autophagy  

E-Print Network [OSTI]

Cell-Autonomous Death of Cerebellar Purkinje Neurons with Autophagy in Niemann-Pick Type C Disease by surrounding mutant npc1 cells. PCs undergoing cell-autonomous degeneration have features consistent for massive PC death. Citation: Ko DC, Milenkovic L, Beier SM, Manuel H, Buchanan J, et al. (2005) Cell-autonomous

Quake, Stephen R.

375

Detecting non-relativistic cosmic neutrinos by capture on tritium: phenomenology and physics potential  

E-Print Network [OSTI]

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_\

Andrew J. Long; Cecilia Lunardini; Eray Sabancilar

2014-11-12T23:59:59.000Z

376

Quasiparticle random phase approximation uncertainties and their correlations in the analysis of neutrinoless double beta decay  

E-Print Network [OSTI]

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.

Amand Faessler; G. L. Fogli; E. Lisi; V. Rodin; A. M. Rotunno; F. Simkovic

2009-03-06T23:59:59.000Z

377

Higgs boson resonance parameters and the finite temperature phase transition in a chirally invariant Higgs-Yukawa model  

E-Print Network [OSTI]

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.

John Bulava; Philip Gerhold; Karl Jansen; Jim Kallarackal; Attila Nagy

2011-11-11T23:59:59.000Z

378

ccsd00003051, Experimental Generation of Large Quadrature EPR Entanglement with a  

E-Print Network [OSTI]

ccsd­00003051, version 1 ­ 11 Oct 2004 Experimental Generation of Large Quadrature EPR Entanglement threshold opens the possibility to produce frequency degenerate bright EPR beams thanks to the phase and their respective links. The strongest EPR entanglement to date is then reported. The paper is organized as follows

379

GENERIC FEEDBACK: 2014 MATH 34032 EXAM (1) (a) Not very many people managed to find the correct adjoint boundary condition  

E-Print Network [OSTI]

GENERIC FEEDBACK: 2014 MATH 34032 EXAM (1) (a) Not very many people managed to find the correct. (2) (a) Many people tried to introduce both c1 and c2. Since the degenerate kernel in this case has know what the adjoint problem is. Not very many people seemed to realise this. (c) Very few people

Sidorov, Nikita

380

ccsd00000886 Super uidity of the 1D Bose gas  

E-Print Network [OSTI]

ccsd­00000886 (version 2) : 22 Mar 2004 Super uidity of the 1D Bose gas Super uidit#19;e du gaz de and degenerate 1D Bose gas at thermal equilibrium with a rotating vessel. The conventional de#12;nition of super uidity predicts that the gas has a signi#12;cant super uid fraction only in the Bose condensed regime

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

CONDENSATION IN EJECTA FROM DENSE THERMONUCLEAR SUPERNOVAE. T. Yu1, B. S. Meyer1, A. V. Fedkin2, and L. Grossman2,3, 1Department of Physics and Astronomy, Clemson University, Clemson, SC  

E-Print Network [OSTI]

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

Grossman, Lawrence

382

Small entries of neutrino mass matrices  

E-Print Network [OSTI]

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 $\

E. Kh. Akhmedov

1999-09-15T23:59:59.000Z

383

Coherent spinor dynamics in a spin-1 Bose condensate  

E-Print Network [OSTI]

, for example, a Bose­Einstein condensate or a degenerate Fermi gas, the phase space accessible to low of coherent spin-changing collisions in a gas of spin-1 bosons. Starting with condensates occupying two spin of the gas, although it does not change the nature of the coherence of the condensate--indeed it has been

Loss, Daniel

384

PUBLISHED ONLINE: 2 NOVEMBER 2014 | DOI: 10.1038/NPHYS3135 Collisions of matter-wave solitons  

E-Print Network [OSTI]

we explore the nature of soliton collisions using Bose­Einstein condensates of atoms with attractive of the nonlinear interaction. Our methods for producing a degenerate gas of 7 Li atoms have been described previously14 and are given in the Methods section. A Bose­Einstein condensate of atoms in the |F =1,mF =1

Loss, Daniel

385

PUBLISHED ONLINE: 20 SEPTEMBER 2009 | DOI: 10.1038/NPHYS1364 Superfluidity of polaritons in semiconductor  

E-Print Network [OSTI]

defects when the flow velocity is slower than the speed of sound in the fluid. Moreover, a Cerenkov-like wake pattern is observed when the flow velocity exceeds the speed of sound. The experimental findings in degenerate gases of interacting bosons. Since its first discovery in liquid helium-4 (refs 1, 2

Loss, Daniel

386

Cosmic Supernova Rate History and Type Ia Supernova Progenitors  

E-Print Network [OSTI]

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.

Chiaki Kobayashi; Ken'ichi Nomoto; Takuji Tsujimoto

2001-02-14T23:59:59.000Z

387

High Fidelity Modeling of Blade Row Interaction in a Transonic Compressor  

E-Print Network [OSTI]

the physics involved in the rotor bow shock interaction with a highly loaded upstream blade row and its eect of this additional loss. At close spacing the rotor bow shock was chopped by the wake generator trailing edge spacing the rotor bow shock degenerated into a bow wave before it interacted with the stator trailing edge

Cincinnati, University of

388

"The world's troubles are your troubles. . . and there is nothing wrong with the world that better humans cannot fix."  

E-Print Network [OSTI]

-Patient Relations 4 InnovativeWays to Live 5 Health Conference to Discuss the Effects of Climate Change 6 Conference of rapid climate change. They focused on the intersection of interdisciplina"union" with Russia,buttressed by its energy and financial subsidies,relationships with theWest further degenerated

Lotko, William

389

VOLUME 84, NUMBER 3 P H Y S I C A L R E V I E W L E T T E R S 17 JANUARY 2000 Beyond Optical Molasses: 3D Raman Sideband Cooling of Atomic Cesium  

E-Print Network [OSTI]

. The technique is based on 3D degenerate Raman sideband cooling in optical lattices and remains efficient even [1]. Although other techniques, such as evaporative cooling [2], velocity-selective coherent Molasses: 3D Raman Sideband Cooling of Atomic Cesium to High Phase-Space Density Andrew J. Kerman, Vladan

Vuletic, Vladan

390

arXiv:1110.4067v1[cond-mat.quant-gas]18Oct2011 Low-temperature, high-density magneto-optical trapping of potassium  

E-Print Network [OSTI]

for the study of quantum degenerate Fermi gases, new cooling techniques would be beneficial. Laser cooling Sciences, University of Toronto, M5S1A7 Canada (Dated: October 19, 2011) We report the laser cooling density over our 767 nm MOT, showing enhanced pre-cooling for quantum gas experiments. A qualitatively

Thywissen, Joseph

391

arXiv:hep-th/0102039v17Feb2001 AN -type Dunkl operators and new spin CalogeroSutherland models  

E-Print Network [OSTI]

N ). (2) Using the relations K2 ij = 1, KijKjk = KikKij = KjkKik, KijKkl = KklKij, (3) where i, j, k, l (1) and prove that Ti, Kjk, i, j, k = 1, . . . , N, span a realization of a degenerate On leave

Zhdanov, Renat

392

Transversal plasma resonance in a nonmagnetized plasma and possibilities of practical employment of it  

E-Print Network [OSTI]

It is shown that in a nonmagnetized plasma, beside the longitudinal Langmuir resonance, there may also exist the transversal resonance. Both these resonance kinds are degenerated. Employment of the transversal resonance makes it possible to design resonators and filters, as well as powerful single-frequency lasers operating on the basis of collective oscillations of plasma.

F. F. Mende

2005-06-09T23:59:59.000Z

393

Search for variation of fundamental constants: Strong enhancements in $X^2\\Pi$ cations of dihalogens and hydrogen halides  

E-Print Network [OSTI]

We propose to use diatomic molecular ions to search for strongly enhanced effects of variation of fundamental constants. The relative enhancement occurs in transitions between nearly degenerate levels of different nature. Since the trapping techniques for molecular ions have already been developed, the molecules HBr$^+$, HI$^+$, Br$^+_2$, I$^+_2$, IBr$^+$, ICl$^+$, and IF$^+$ are very promising candidates for such future studies.

Pasteka, L F; Flambaum, V V; Schwerdtfeger, P

2015-01-01T23:59:59.000Z

394

Adenoviral Mediated Gene Delivery to Human Umbilical Cord Mesenchymal Stromal Cells for Inner Ear Hair Cell Differentiation  

E-Print Network [OSTI]

. Sensory neural hearing loss (SNHL) is the most common form, which results from degeneration of inner ear sensory hair cells and auditory neurons in the cochlea. In recent years, there has been an increasing interest in gene delivery to mesenchymal stem...

Devarajan, Keerthana

2011-07-28T23:59:59.000Z

395

A HIGH-RESOLUTION SPECTROSCOPIC SEARCH FOR THE REMAINING DONOR FOR TYCHO'S SUPERNOVA  

SciTech Connect (OSTI)

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.

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

396

THE ELM SURVEY. V. MERGING MASSIVE WHITE DWARF BINARIES  

SciTech Connect (OSTI)

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.

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

397

Adiabatic approximation, Gell-Mann and Low theorem and degeneracies: A pedagogical example  

E-Print Network [OSTI]

We study a simple system described by a 2x2 Hamiltonian and the evolution of the quantum states under the influence of a perturbation. More precisely, when the initial Hamiltonian is not degenerate,we check analytically the validity of the adiabatic approximation and verify that, even if the evolution operator has no limit for adiabatic switchings, the Gell-Mann and Low formula allows to follow the evolution of eigenstates. In the degenerate case, for generic initial eigenstates, the adiabatic approximation (obtained by two different limiting procedures) is either useless or wrong, and the Gell-Mann and Low formula does not hold. We show how to select initial states in order to avoid such failures.

Christian Brouder; Gabriel Stoltz; Gianluca Panati

2008-07-26T23:59:59.000Z

398

Self-similar expansion of a warm dense plasma  

SciTech Connect (OSTI)

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.

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

399

Discovery of an Ultracool White Dwarf Companion  

E-Print Network [OSTI]

The discovery of a low luminosity common proper motion companion to the white dwarf GD392 at a wide separation of $46''$ is reported. $BVRI$ photometry suggests a low temperature ($T_{\\rm eff}\\sim4000$ K) while $JHK$ data strongly indicate suppressed flux at all near infrared wavelengths. Thus, GD392B is one of the few white dwarfs to show significant collision induced absorption due to the presence of photospheric ${\\rm {H_2}}$ and the first ultracool white dwarf detected as a companion to another star. Models fail to explain GD392B as a normal mass white dwarf. If correct, the cool companion may be explained as a low mass white dwarf or unresolved double degenerate. The similarities of GD392B to known ultracool degenerates are discussed, including some possible implications for the faint end of the white dwarf luminosity function.

J. Farihi

2004-04-14T23:59:59.000Z

400

Effect of electron flow on the ordinary-extraordinary mode conversion  

SciTech Connect (OSTI)

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.

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

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Absorption by cold Fermi atoms in a harmonic trap  

E-Print Network [OSTI]

We study the absorption spectrum for a strongly degenerate Fermi gas confined in a harmonic trap. The spectrum is calculated using both the exact summation and also the Thomas-Fermi (TF) approximation. In the latter case, relatively simple analytical expressions are obtained for the absorption lineshape at large number of trapped atoms. At zero temperature, the approximated lineshape is characterized by a $(1-z^2)^{5/2}$ dependence which agrees well with the exact numerical calculations. At non-zero temperature, the spectrum becomes broader, although remains non-Gaussian as long as the fermion gas is degenerate. The changes in the trap frequency for an electronically excited atom can introduce an additional line broadening.

Gediminas Juzeliunas; Marius Masalas

2000-11-10T23:59:59.000Z

402

Structures of Human Pumilio with Noncognate RNAs Reveal Molecular Mechanisms for Binding Promiscuity  

SciTech Connect (OSTI)

Pumilio is a founder member of the evolutionarily conserved Puf family of RNA-binding proteins that control a number of physiological processes in eukaryotes. A structure of human Pumilio (hPum) Puf domain bound to a Drosophila regulatory sequence showed that each Puf repeat recognizes a single nucleotide. Puf domains in general bind promiscuously to a large set of degenerate sequences, but the structural basis for this promiscuity has been unclear. Here, we describe the structures of hPum Puf domain complexed to two noncognate RNAs, CycBreverse and Puf5. In each complex, one of the nucleotides is ejected from the binding surface, in effect, acting as a 'spacer.' The complexes also reveal the plasticity of several Puf repeats, which recognize noncanonical nucleotides. Together, these complexes provide a molecular basis for recognition of degenerate binding sites, which significantly increases the number of mRNAs targeted for regulation by Puf proteins in vivo.

Gupta,Y.; Nair, D.; Wharton, R.; Aggarwal, A.

2008-01-01T23:59:59.000Z

403

Fluctuation properties of laser light after interaction with an atomic system: comparison between two-level and multilevel atomic transitions  

E-Print Network [OSTI]

The complex internal atomic structure involved in radiative transitions has an effect on the spectrum of fluctuations (noise) of the transmitted light. A degenerate transition has different properties in this respect than a pure two-level transition. We investigate these variations by studying a certain transition between two degenerate atomic levels for different choices of the polarization state of the driving laser. For circular polarization, corresponding to the textbook two-level atom case, the optical spectrum shows the characteristic Mollow triplet for strong laser drive, while the corresponding noise spectrum exhibits squeezing in some frequency ranges. For a linearly polarized drive, corresponding to the case of a multilevel system, additional features appear in both optical and noise spectra. These differences are more pronounced in the regime of a weakly driven transition: whereas the two-level case essentially exhibits elastic scattering, the multilevel case has extra noise terms related to sponta...

Lezama, A; Kastberg, A; Tanzilli, S; Kaiser, R

2015-01-01T23:59:59.000Z

404

Vacuum degeneracy of a circuit-QED system in the ultrastrong coupling regime  

E-Print Network [OSTI]

We investigate theoretically the quantum vacuum properties of a chain of $N$ superconducting Josephson atoms inductively coupled to a transmission line resonator. We derive the quantum field Hamiltonian for such circuit-QED system, showing that, due to the type and strength of the interaction, a quantum phase transition can occur with a twice degenerate quantum vacuum above a critical coupling. In the finite-size case, the degeneracy is lifted, with an energy splitting decreasing exponentially with increasing values of $g^2 N^2$, where $g$ is the dimensionless vacuum Rabi coupling per artificial atom. We determine analytically the ultrastrong coupling asymptotic expression of the two degenerate vacua for an arbitrary number of artificial atoms and of resonator modes. In the ultrastrong coupling regime the degeneracy is protected with respect to random fluctuations of the transition energies of the Josephson elements.

Pierre Nataf; Cristiano Ciuti

2010-01-15T23:59:59.000Z

405

Metal Alloy Compositions And Process Background Of The Invention  

DOE Patents [OSTI]

A skinless metal alloy composition free of entrapped gas and comprising primary solid discrete degenerate dendrites homogeneously dispersed within a secondary phase is formed by a process wherein the metal alloy is heated in a vessel to render it a liquid. The liquid is then rapidly cooled while vigorously agitating it under conditions to avoid entrapment of gas while forming solid nuclei homogeneously distributed in the liquid. Agitation then is ceased when the liquid contains a small fraction solid or the liquid-solid alloy is removed from the source of agitation while cooling is continued to form the primary solid discrete degenerate dendrites in liquid secondary phase. The solid-liquid mixture then can be formed such as by casting.

Flemings, Merton C. (Cambridge, MA); Martinez-Ayers, Raul A. (Somerville, MA); de Figueredo, Anacleto M. (Newton, MA); Yurko, James A. (Boston, MA)

2003-11-11T23:59:59.000Z

406

Speed-up of combustion fronts in shear flows  

E-Print Network [OSTI]

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.

Hamel, Francois

2011-01-01T23:59:59.000Z

407

Degeneracy Breaking of Hydrogen Atom  

E-Print Network [OSTI]

The three dimensional rotation group, SO(3), is a symmetry group of the normal hydrogen atom. Each reducible representation of this group can be associated with a degenerate energy level. If this atom is placed in an external magnetic field, the interaction between the orbital magnetic moment with this field will lead to a symmetry breaking where the symmetry group of the atom is a new group distinct from the SO(3) group. This phenomenon describes the normal Zeeman effect, where a degenerate energy level splits into several new energy levels. It is explicitly shown that each of the new energy levels can be associated with an irreducible representation of the new symmetry group.

Agung Trisetyarso; Pantur Silaban

2014-11-21T23:59:59.000Z

408

Energy-Momentum Distribution: Some Examples  

E-Print Network [OSTI]

In this paper, we elaborate the problem of energy-momentum in General Relativity with the help of some well-known solutions. In this connection, we use the prescriptions of Einstein, Landau-Lifshitz, Papapetrou and M\\"{o}ller to compute the energy-momentum densities for four exact solutions of the Einstein field equations. We take the gravitational waves, special class of Ferrari-Ibanez degenerate solution, Senovilla-Vera dust solution and Wainwright-Marshman solution. It turns out that these prescriptions do provide consistent results for special class of Ferrari-Ibanez degenerate solution and Wainwright-Marshman solution but inconsistent results for gravitational waves and Senovilla-Vera dust solution.

M. Sharif; M. Azam

2006-12-08T23:59:59.000Z

409

Health monitoring method for composite materials  

DOE Patents [OSTI]

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.

Watkins, Jr., Kenneth S. (Dahlonega, GA); Morris, Shelby J. (Hampton, VA)

2011-04-12T23:59:59.000Z

410

Aging management guideline for commercial nuclear power plants - heat exchangers  

SciTech Connect (OSTI)

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.

Booker, S.; Lehnert, D.; Daavettila, N.; Palop, E.

1994-06-01T23:59:59.000Z

411

A methodology for evaluating ``new`` technologies in nuclear power plants  

SciTech Connect (OSTI)

As obsolescence and spare parts issues drive nuclear power plants to upgrade with new technology (such as optical fiber communication systems), the ability of the new technology to withstand stressors present where it is installed needs to be determined. In particular, new standards may be required to address qualification criteria and their application to the nuclear power plants of tomorrow. This paper discusses the failure modes and age-related degradation mechanisms of fiber optic communication systems, and suggests a methodology for identifying when accelerated aging should be performed during qualification testing.

Korsah, K.; Clark, R.L.; Holcomb, D.E.

1994-06-01T23:59:59.000Z

412

Issues arising with the application of optical fiber transmission in class 1E systems in nuclear power plants  

SciTech Connect (OSTI)

The application of fiber optic links and networks in safety-critical systems in the next generation of nuclear power plants, as well as in some digital upgrades in present-day plants, will mean that these links must be highly reliable and able to withstand the effect of environmental stressors present at the installation location. This paper discusses the failure modes and age-related mechanisms of fiber optic transmission components and identifies environmental stressors that could adversely affect their reliability over the long term. Some of the standards that could be used in their qualification for safety-critical applications are also discussed briefly.

Korsah, K. [Oak Ridge National Lab., TN (United States); Antonescu, C. [Nuclear Regulatory Commission, Washington, DC (United States). Office of Nuclear Regulatory Research

1993-12-31T23:59:59.000Z

413

On form factors and Macdonald polynomials  

E-Print Network [OSTI]

We are developing the algebraic construction for form factors of local operators in the sinh-Gordon theory proposed in [B.Feigin, M.Lashkeivch, 2008]. We show that the operators corresponding to the null vectors in this construction are given by the degenerate Macdonald polynomials with rectangular partitions and the parameters $t=-q$ on the unit circle. We obtain an integral representation for the null vectors and discuss its simple applications.

Lashkevich, Michael

2013-01-01T23:59:59.000Z

414

On form factors and Macdonald polynomials  

E-Print Network [OSTI]

We are developing the algebraic construction for form factors of local operators in the sinh-Gordon theory proposed in [B.Feigin, M.Lashkeivch, 2008]. We show that the operators corresponding to the null vectors in this construction are given by the degenerate Macdonald polynomials with rectangular partitions and the parameters $t=-q$ on the unit circle. We obtain an integral representation for the null vectors and discuss its simple applications.

Michael Lashkevich; Yaroslav Pugai

2014-12-23T23:59:59.000Z

415

Nonlinear phenomena of generation of longitudinal electric current by transversal electromagnetic field in plasmas  

E-Print Network [OSTI]

The analysis of nonlinear interaction of transversal electromagnetic field with collisionless plasma is carried out. Formulas for calculation electric current in collisionless plasma with arbitrary degree of degeneration of electronic gas are deduced. It has appeared, that the nonlinearity account leads to occurrence of the longitudinal electric current directed along a wave vector. This second current is orthogonal to the known transversal current, received at the classical linear analysis.

Latyshev, A V

2015-01-01T23:59:59.000Z

416

Gender dependent survival of allogeneic trophoblast stem cells  

E-Print Network [OSTI]

stem cells may exhibit and confer immune privilege. These findings suggest applications in cell and gene therapy as well as provide a new model for studying trophoblast physiology and immunology. iv DEDICATION John Donne wrote that ?No man... or their in vitro-differentiated derivatives have been largely unsuccessful. When syngeneic TS cells were injected subcutaneously into non-pregnant females, they were reported to differentiate into giant cells within 5-10 days and to degenerate rapidly (7...

Epple - Farmer, Jessica Anne

2009-05-15T23:59:59.000Z

417

The Fukaya category, exotic forms and exotic autoequivalences  

E-Print Network [OSTI]

The Fukaya category, exotic forms and exotic autoequivalences Richard Mark Harris Department of Pure Mathematics and Mathematical Statistics Emmanuel College, Cambridge A thesis submitted for the degree of Doctor of Philosophy at the University... qualification. i Summary of the thesis “The Fukaya category, exotic forms and exotic autoequivalences” by Richard Mark Harris: A symplectic manifold is a smooth manifold M together with a choice of a closed non-degenerate two-form. Recent years have seen...

Harris, Richard

2012-04-10T23:59:59.000Z

418

Optical vortex interaction and generation via nonlinear wave mixing  

SciTech Connect (OSTI)

Optical vortex beams are made to interact via degenerate two-wave mixing in a Kerr-like nonlinear medium. Vortex mixing is shown to occur inside the medium, leading to exchange of topological charge and cascaded generation of vortex beams. A mean-field model is developed and is shown to account for the selection rules of the topological charges observed after the wave-mixing process. Fractional charges are demonstrated to follow the same rules as for integer charges.

Lenzini, F. [INLN, Universite de Nice-Sophia Antipolis, CNRS, 1361 route des Lucioles, FR-06560 Valbonne (France); Dipartimento di Fisica, Universita di Firenze, via Sansone 1, IT-50019 Sesto Fiorentino (Italy); Residori, S.; Bortolozzo, U. [INLN, Universite de Nice-Sophia Antipolis, CNRS, 1361 route des Lucioles, FR-06560 Valbonne (France); Arecchi, F. T. [Dipartimento di Fisica, Universita di Firenze, via Sansone 1, IT-50019 Sesto Fiorentino (Italy)

2011-12-15T23:59:59.000Z

419

Beam driven upper-hybrid-wave instability in quantized semiconductor plasmas  

SciTech Connect (OSTI)

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.

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

420

Photon-photon polarization correlations as a tool for studying parity non-conservation in heliumlike Uranium  

E-Print Network [OSTI]

Due to electron-nucleus weak interaction, atomic bound states with different parities turn out to be mixed. We discuss a prospect for measuring the mixing parameter between the nearly degenerate metastable states 1s_{1/2} 2s_{1/2} : J = 0 and 1s_{1/2} 2p_{1/2} : J = 0 in heliumlike Uranium. Our analysis is based on the polarization properties of the photons emitted in the two-photon decays of such states.

Filippo Fratini; Sergiy Trotsenko; Stanislav Tashenov; Thomas Stoehlker; Andrey Surzhykov

2011-03-27T23:59:59.000Z

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Partial degeneracy effects in the stopping of relativistic electrons in supercompressed thermonuclear fuels  

SciTech Connect (OSTI)

The effects of supercompressed and partially degenerate electron fluid on projectile energy loss of laser produced relativistic electron beams (REBs) in the MeV range are investigated. Partial degeneracy is shown to affect significantly the REB stopping power for 0.2{<=}{theta}=T/TF{<=}1 while its variations with beam energy appear much less {theta} dependent. The latter exhibit a characteristic V-like shape for any target electron density, and {theta} values.

Starikov, Konstantin V.; Deutsch, Claude [Department of Physics, Kazakh National University, Tole Bi 96, ALMATY 480012 (Kazakhstan) and LPGP (UMR-CNRS 8578), Bat. 210, Universite Paris XI, 91405 Orsay (France)

2007-02-15T23:59:59.000Z

422

Measuring stellar magnetic fields with the low resolution spectropolarimeter of the William Herschel Telescope  

E-Print Network [OSTI]

Despite the influence of magnetic fields on the structure and evolution of stars is largely demonstrated from the theoretical point of view, their observational evidence in non-degenerated stars is still rather scanty and mainly circumscribed to bright objects (V 600, show an internal error of <50 G selecting the whole interval and <200 G within a Balmer line. Ripples in the Stokes V spectra of HD3360 result in an instrumental positive magnetic field certainly not larger than 80 G.

F. Leone

2007-09-13T23:59:59.000Z

423

Electron transfer and capture dynamics in ZnSe quantum wells grown on GaAs  

SciTech Connect (OSTI)

We investigate the transfer and capture dynamics of electrons in phase coherent photorefractive ZnSe quantum wells grown on GaAs using degenerate three-beam four-wave-mixing. The measurements reveal electron capture times by the quantum well in the order of several tens of picoseconds and a transit time of approximately 5 picoseconds from the GaAs substrate through the ZnMgSe barrier.

Dongol, A.; Wagner, H. P. [Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221 (United States)

2013-12-04T23:59:59.000Z

424

Transverse electric conductivity of quantum collisional plasmas  

E-Print Network [OSTI]

Formulas for calculation of transverse dielectric function and transverse electric conductivity in quantum collisional plasmas under arbitrary degree of degeneracy of the electron gas are received. The Wigner - Vlasov - Boltzmann kinetic equation with collision integral in BGK (Bhatnagar, Gross and Krook) form in coordinate space is used. Various special cases are investigated. The case of fully degenerate quantum plasma was considered separately. Comparison with Lindhard's formula has been realized.

A. V. Latyshev; A. A. Yushkanov

2010-07-06T23:59:59.000Z

425

A review of "Old Worlds: Egypt, Southwest Asia, India, and Russia in Early Modern English Writing." by John Michael Archer  

E-Print Network [OSTI]

?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...

Galina Yermolenko

2002-01-01T23:59:59.000Z

426

Low-energy U(1) x USp(2M) gauge theory from simple high-energy gauge group  

E-Print Network [OSTI]

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.

Sven Bjarke Gudnason; Kenichi Konishi

2010-05-17T23:59:59.000Z

427

Quantification of exudation from sorghum roots  

E-Print Network [OSTI]

) rice, sugar cane (31, 35) wheat, corn, tomato, lucerne (35) corn, wheat, rice (31, 35, 39) legumes (31) decomposition: release of low molecular weight components from degenerate epidermal, cortical and root cap cells; invasion of cells... bacteria/g represent those units for wnich no co'onies were observed at a dilution of 10 30 The uniformity of colonies growing on the agar surface suggested that the variety of microbial species present in the experimental jars was greatly reduced from...

Kennedy, Lynne Susan

1980-01-01T23:59:59.000Z

428

Spinors, matrix structures, and projective geometry in polarization optics  

E-Print Network [OSTI]

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.

E. Ovsiyuk; O. Veko; M. Neagu; V. Balan; V. Red'kov

2014-10-31T23:59:59.000Z

429

Holonomic Quantum Computation via Adiabatic Shortcut  

E-Print Network [OSTI]

Fast quantum gates based on geometric phases provide a platform for performing robust quantum computation. In particular, non-adiabatic holonomic quantum computation, which involves non-Abelian geometric phases to achieve universality, has recently been demonstrated in several experiments. Here, we generalize the transitionless quantum driving algorithm to a degenerate Hilbert space, with which we propose a route towards fast holonomic quantum computation. We propose a proof-of-principle experiment in a superconducting circuit architecture to realize our scheme.

J. Zhang; Thi Ha Kyaw; D. M. Tong; Erik Sjöqvist; L. C. Kwek

2014-12-09T23:59:59.000Z

430

The role of stress in recovery of function after spinal cord injury  

E-Print Network [OSTI]

of function and chronic pain associated with spinal cord injury (Elliot & Frank, 1996). On average, these individuals exhibit less function than non-depressed patients. The reason for this may be motivational, however recent research from our laboratory... following injury, contributing to the number of fibers that undergo Wallerian degeneration in the first 6 months (Crowe et al., 1997; Grossman, Rosenberg, & Wrathall, 2001; Li et al., 1999; Schwab & Bartholdi, 1996; Shuman, Bresnahan, & 7 Beattie, 1997...

Washburn, Stephanie Nicole

2009-05-15T23:59:59.000Z

431

Superconductors with Topological Order  

E-Print Network [OSTI]

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.

M. C. Diamantini; P. Sodano; C. A. Trugenberger

2005-11-18T23:59:59.000Z

432

A very high frequency CMOS Variable Gain Amplifier  

E-Print Network [OSTI]

of the VGA output signal . . . . . . . . . 80 Bandwidth with different frequency compensation circuits bias current at 22dB gain setting. . . 84 XIV VGA comparison . . . 88 LIST OF FIGURE FIGURE I 2", 3 and 4'" order sigma-delta modulator SNR vs. input... level . . . . Page 2 Block diagram of a direct conversion receiver. 3 Single transistor transconductor 4 Differential pair 5 Source degeneration amplifier. 6 Four-quadrant multiplier basic architectures . . . . . . . . 10 7 Multiplier as a...

Tan, Siang Tong

2012-06-07T23:59:59.000Z

433

Enduring myths: smrang, rabs and ritual in the Dunhuang texts on Padmasambhava  

E-Print Network [OSTI]

). This basic stereotypical structure narrates a theme of the world's first origination from nothingness into a state characterised by a primal har- mony between humans and spirits. However, this is lost by man's various misdemeanors such as hunting, polluting... the waters, digging the ground, cutting down trees, or committing murder, all of which create forms of pollution (mnol, dme), and give rise to a state of tension between humans and spirits, and a degeneration of society, health, and the times in general...

Cathy Cantwell; Mayer, Rob

2008-01-01T23:59:59.000Z

434

Harmonic oscillator in a background magnetic field in noncommutative quantum phase-space  

E-Print Network [OSTI]

We solve explicitly the two-dimensional harmonic oscillator and the harmonic oscillator in a background magnetic field in noncommutative phase-space without making use of any type of representation. A key observation that we make is that for a specific choice of the noncommutative parameters, the time reversal symmetry of the systems get restored since the energy spectrum becomes degenerate. This is in contrast to the noncommutative configuration space where the time reversal symmetry of the harmonic oscillator is always broken.

Joseph Ben Geloun; Sunandan Gangopadhyay; Frederik G Scholtz

2009-01-22T23:59:59.000Z

435

Exciton Bose condensation : the ground state of an electron-hole gas I. Mean field description of a simplified model  

E-Print Network [OSTI]

1069 Exciton Bose condensation : the ground state of an electron-hole gas I. Mean field description dégénérées. Nous étudions la condensation de Bose de ce système en fonction de la densité, négligeant dans-hole gas in a simple model semiconductor, with direct gap and isotropic, non degenerate bands. We study

Boyer, Edmond

436

Hydrodynamic equations for electrons in graphene obtained from the maximum entropy principle  

SciTech Connect (OSTI)

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.

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

437

Hybrid Monte Carlo with Wilson Dirac operator on the Fermi GPU  

E-Print Network [OSTI]

In this article we present our implementation of a Hybrid Monte Carlo algorithm for Lattice Gauge Theory using two degenerate flavours of Wilson-Dirac fermions on a Fermi GPU. We find that using registers instead of global memory speeds up the code by almost an order of magnitude. To map the array variables to scalars, so that the compiler puts them in the registers, we use code generators. Our final program is more than 10 times faster than a generic single CPU.

Abhijit Chakrabarty; Pushan Majumdar

2012-07-10T23:59:59.000Z

438

Pulsed-gate measurements of the singlet-triplet relaxation time in a two-electron double quantum dot  

E-Print Network [OSTI]

-gate technique with charge sensing is used to measure the singlet-triplet relaxation time for nearly degenerate spin states in a two-electron double quantum dot. Transitions from the 1,1 charge occupancy state. At dilution refrigerator temperatures, this implies that EZeeman kBT 10 eV, or B 0.5 T. For B 0.5 T, T1 shows

Petta, Jason

439

Spectrum of quenched twisted mass lattice QCD at maximal twist  

SciTech Connect (OSTI)

Hadron masses are computed from quenched twisted mass lattice QCD for a degenerate doublet of up and down quarks with the twist angle set to {pi}/2, since this maximally-twisted theory is expected to be free of linear discretization errors. Two separate definitions of the twist angle are used, and the hadron masses for these two cases are compared. The flavor breaking, that can arise due to twisting, is discussed in the context of mass splittings within the {delta}(1232) multiplet.

Abdel-Rehim, Abdou M.; Lewis, Randy; Woloshyn, R.M. [Department of Physics, University of Regina, Regina, SK, S4S 0A2 (Canada); TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3 (Canada)

2005-05-01T23:59:59.000Z

440

Continuous space-time transformations  

E-Print Network [OSTI]

We prove that every continuous map acting on the four-dimensional Minkowski space and preserving light cones in one direction only is either a Poincar\\'e similarity, that is, a product of a Lorentz transformation and a dilation, or it is of a very special degenerate form. In the presence of the continuity assumption the main tool in the proof is a basic result from the homotopy theory of spheres.

Clément de Seguins Pazzis; Peter Šemrl

2015-02-04T23:59:59.000Z

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

TURNING BACK THE CLOCK: CGP55845 REVERSES MILD COGNITIVE IMPAIRMENT IN FISCHER 344 RATS  

E-Print Network [OSTI]

). Similarly, selective lesions of GABAergic basal forebrain neurons have not been shown to cause deficits of the severity observed in MCI (Pang et al., 2001). However, lesions of both the GABAergic and cholinergic outputs of the basal forebrain have been... shown to elicit severe deficits in cognition and memory formation (Pang and Nocera, 1999; Pang et al., 2001; Yoder and Pang, 2005). Also, several studies have implicated BF degeneration in cognitive dysfunction and learning impairments (Eichenbaum...

Mayse, Jeffrey

2011-01-11T23:59:59.000Z

442

On the ultimate fate of AM Her stars  

E-Print Network [OSTI]

We suggest, that the magnetic field of the white dwarf in AM Her systems loses coupling to the secondary star when the latter becomes non-magnetic at the transition from a late main sequence star to a cool degenerate brown dwarf. This leads to spin-up of the primary white dwarf. After synchronous rotation is lost the systems do not appear as AM Her stars anymore. We discuss the further evolution of such systems.

F. Meyer; E. Meyer-Hofmeister

1999-05-06T23:59:59.000Z

443

Hybrid Monte Carlo with Wilson Dirac operator on the Fermi GPU  

E-Print Network [OSTI]

In this article we present our implementation of a Hybrid Monte Carlo algorithm for Lattice Gauge Theory using two degenerate flavours of Wilson-Dirac fermions on a Fermi GPU. We find that using registers instead of global memory speeds up the code by almost an order of magnitude. To map the array variables to scalars, so that the compiler puts them in the registers, we use code generators. Our final program is more than 10 times faster than a generic single CPU.

Chakrabarty, Abhijit

2012-01-01T23:59:59.000Z

444

Kinetic and electron-electron energies for convex sums of ground state densities with degeneracies and fractional electron number  

SciTech Connect (OSTI)

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.

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

445

Generation of polarization entangled photons using type-II doubly periodically poled lithium niobate waveguides  

E-Print Network [OSTI]

In this paper, we address the issue of the generation of non-degenerate cross-polarization-entangled photon pairs using type-II periodically poled lithium niobate. We show that, by an appropriate engineering of the quasi-phase-matching grating, it is possible to simultaneously satisfy the conditions for two spontaneous parametric down-conversion processes, namely ordinary pump photon down-conversion to either extraordinary signal and ordinary idler paired photons, or to ordinary signal and extraordinary idler paired photons. In contrast to single type-II phase-matching, these two processes, when enabled together, can lead to the direct production of cross-polarization-entangled state for non degenerate signal and idler wavelengths. Such a scheme should be of great interest in applications requiring polarization-entangled non degenerate paired photons with, for instance, one of the entangled photons at an appropriate wavelength being used for local operation or for quantum storage in an atomic ensemble, and the other one at the typical wavelength of 1550 nm for propagation through an optical fiber.

K. Thyagarajan; K. Sinha; J. Lugani; S. Ghosh; A. Martin; D. B. Ostrowsky; O. Alibart; S. Tanzilli

2009-12-29T23:59:59.000Z

446

Transport of Magnetic Fields in Convective, Accreting Supernova Cores  

E-Print Network [OSTI]

We consider the amplification and transport of a magnetic field in the collapsed core of a massive star, including both the region between the neutrinosphere and the shock, and the central, opaque core. An analytical argument explains why rapid convective overturns persist within a newly formed neutron star for roughly 10 seconds ($> 10^3$ overturns), consistent with recent numerical models. A dynamical balance between turbulent and magnetic stresses within this convective layer corresponds to flux densities in excess of $10^{15}$G. Material accreting onto the core is heated by neutrinos and also becomes strongly convective. We compare the expected magnetic stresses in this convective `gain layer' with those deep inside the neutron core. Buoyant motions of magnetized fluid are greatly aided by the intense neutrino flux. We calculate the transport rate through a medium containing free neutrons protons, and electrons, in the limiting cases of degenerate or non-degenerate nucleons. Fields stronger than $\\sim 10^{13}$ G are able to rise through the outer degenerate layers of the neutron core during the last stages of Kelvin-Helmholtz cooling (up to 10 seconds post-collapse), even though these layers have become stable to convection. We also find the equilibrium shape of a thin magnetic flux rope in the dense hydrostatic atmosphere of the neutron star, along with the critical separation of the footpoints above which the rope undergoes unlimited expansion against gravity. The implications of these results for pulsar magnetism are summarized, and applied to the case of late fallback over the first 1,000-10,000 s of the life of a neutron star

Christopher Thompson; Norman Murray

2001-05-24T23:59:59.000Z

447

A SEARCH FOR RAPIDLY ACCRETING WHITE DWARFS IN THE SMALL MAGELLANIC CLOUD  

SciTech Connect (OSTI)

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.

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

448

Cold plus hot dark matter cosmology in the light of solar and atmospheric neutrino oscillations  

SciTech Connect (OSTI)

We explore the implications of possible neutrino oscillations, as indicated by the solar and atmospheric neutrino experiments, for the cold plus hot dark matter scenario of large-scale structure formation. We find that there are essentially three distinct schemes that can accommodate the oscillation data and which also allow for dark matter neutrinos. These include (i) three nearly degenerate (in mass) neutrinos, (ii) nondegenerate masses with {nu}{sub {tau}} in the eV range, and (iii) a nearly degenerate {nu}{sub {mu}}-{nu}{sub {tau}} pair (in the eV range), with the additional possibility that the electron neutrino is cosmologically significant. The last two schemes invoke a {open_quote}{open_quote}sterile{close_quote}{close_quote} neutrino which is light ({approx_lt}eV). We discuss the implications of these schemes for {bar {nu}}{sub {mu}}-{bar {nu}}{sub {ital e}} and {nu}{sub {mu}}-{nu}{sub {tau}} oscillation, and find that scheme (ii), in particular, predicts them to be in the observable range. As far as structure formation is concerned we compare the one neutrino flavor case with a variety of other possibilities, including two and three degenerate neutrino flavors. We show, both analytically and numerically, the effects of these neutrino mass scenarios on the amplitude of cosmological density fluctuations. With a Hubble constant of 50 km s{sup {minus}}{sup 1} Mpc{sup {minus}}{sup 1}, a spectral index of unity, and {Omega}{sub b}{sub a}{sub r}{sub y}{sub o}{sub n}=0.05, the two and three flavor scenarios fit the observational data marginally better than the single flavor scheme. However, taking account of the uncertainties in these parameters, we show that it is premature to pick a clear winner. {copyright} {ital 1996 The American Physical Society.}

Babu, K.S.; Schaefer, R.K.; Shafi, Q. [Bartol Research Institute, University of Delaware, Newark, Delaware 19716 (United States)] [Bartol Research Institute, University of Delaware, Newark, Delaware 19716 (United States)

1996-01-01T23:59:59.000Z

449

Bifurcations and stability of standing waves in the nonlinear Schrödinger equation on the tadpole graph  

E-Print Network [OSTI]

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.

Diego Noja; Dmitry Pelinovsky; Gaukhar Shaikhova

2014-12-28T23:59:59.000Z

450

A seismic approach to testing different formation channels of subdwarf B stars  

E-Print Network [OSTI]

There are many unknowns in the formation of subdwarf B stars. Different formation channels are considered to be possible and to lead to a variety of helium-burning subdwarfs. All seismic models to date, however, assume that a subdwarf B star is a post-helium-flash-core surrounded by a thin inert layer of hydrogen. We examine an alternative formation channel, in which the subdwarf B star originates from a massive (>~2 Msun) red giant with a non-degenerate helium-core. Although these subdwarfs may evolve through the same region of the log g-Teff diagram as the canonical post-flash subdwarfs, their interior structure is rather different. We examine how this difference affects their pulsation modes and whether it can be observed. Using detailed stellar evolution calculations we construct subdwarf B models from both formation channels. The iron accumulation in the driving region due to diffusion, which causes the excitation of the modes, is approximated by a Gaussian function. The pulsation modes and frequencies are calculated with a non-adiabatic pulsation code. A detailed comparison of two subdwarf B models from different channels, but with the same log g and Teff, shows that their mode excitation is different. The excited frequencies are lower for the post-flash than for the post-non-degenerate subdwarf B star. This is mainly due to the differing chemical composition of the stellar envelope. A more general comparison between two grids of models shows that the excited frequencies of most post-non-degenerate subdwarfs cannot be well-matched with the frequencies of post-flash subdwarfs. In the rare event that an acceptable seismic match is found, additional information, such as mode identification and log g and Teff determinations, allows us to distinguish between the two formation channels.

Haili Hu; M. -A. Dupret; C. Aerts; G. Nelemans; S. D. Kawaler; A. Miglio; J. Montalban; R. Scuflaire

2008-08-22T23:59:59.000Z

451

Inviscid Limits for a Stochastically Forced Shell Model of Turbulent Flow  

E-Print Network [OSTI]

We establish the anomalous mean dissipation rate of energy in the inviscid limit for a stochastic shell model of turbulent fluid flow. The proof relies on viscosity independent bounds for stationary solutions and on establishing ergodic and mixing properties for the viscous model. The shell model is subject to a degenerate stochastic forcing in the sense that noise acts directly only through one wavenumber. We show that it is hypo-elliptic (in the sense of Hormander) and use this property to prove a gradient bound on the Markov semigroup.

Susan Friedlander; Nathan Glatt-Holtz; Vlad Vicol

2014-04-03T23:59:59.000Z

452

Flavor $\\S_{4}$ [circle times operator] $\\Z_{2}$ symmetry and neutrino mixing  

E-Print Network [OSTI]

We present a model of the lepton masses and flavor mixing based on the discrete group $S^{}_4\\otimes Z^{}_2$. In this model, all the charged leptons and neutrinos are assigned to the ${\\bf \\underline{3}}_\\alpha$ representation of $S^{}_4$ in the Yamanouchi bases. The charged lepton and neutrino masses are mainly determined by the vacuum expectation value structures of the Higgs fields. Our model predicts a nearly tri-bimaximal lepton flavor mixing pattern, which is fully in agreement with the current experimental results. The neutrino mass spectrum takes the nearly degenerate pattern, which may be well tested in the future precise experiments.

Zhang, H

2007-01-01T23:59:59.000Z

453

Analysis and estimation of the threshold for a microwave "pellicle mirror" parametric oscillator, via energy conservation  

E-Print Network [OSTI]

An experiment is proposed to observe the dynamical Casimir effect by means of two tandem, high Q, superconducting microwave cavities, which are separated from each other by only a very thin wall consisting of a flexible superconducting membrane that can be driven into motion by means of resonant "pump" microwaves injected into the left cavity. Degenerate "signal" and "idler" microwave signals can then be generated by the exponential amplification of vacuum fluctuations in the initially empty right cavity, above a certain threshold. The purpose of this paper is calculate the threshold for this novel kind of opto-mechanical parametric oscillation, using energy considerations.

Chiao, Raymond Y

2012-01-01T23:59:59.000Z

454

Hamiltonian structure of Dubrovin{close_quote}s equation of associativity in 2-d topological field theory  

SciTech Connect (OSTI)

mA third order Monge-Amp{grave e}re type equation of associativity that Dubrovin has obtained in 2-d topological field theory is formulated in terms of a variational principle subject to second class constraints. Using Dirac{close_quote}s theory of constraints this degenerate Lagrangian system is cast into Hamiltonian form and the Hamiltonian operator is obtained from the Dirac bracket. There is a new type of Kac-Moody algebra that corresponds to this Hamiltonian operator. In particular, it is not a W-algebra. {copyright} {ital 1996 American Institute of Physics.}

Galvao, C.A. [Universidade de Brasilia, Departamento de Fisica, 70.910 Brasilia DF, (Brasil)] [Universidade de Brasilia, Departamento de Fisica, 70.910 Brasilia DF, (Brasil); Nutku, Y. [TUeBITAK---Marmara Research Center, Research Institute for Basic Sciences, Department of Physics, 41470 Gebze (Turkey)] [TUeBITAK---Marmara Research Center, Research Institute for Basic Sciences, Department of Physics, 41470 Gebze (Turkey)

1996-12-01T23:59:59.000Z

455

Fusion rules and vortices in $p_x+ip_y$ superconductors  

E-Print Network [OSTI]

The "half-quantum" vortices ($\\sigma$) and quasiparticles ($\\psi$) in a two-dimensional $p_x+ip_y$ superconductor obey the Ising-like fusion rules $\\psi\\times \\psi=1$, $\\sigma\\times \\psi=\\sigma$, and $\\sigma\\times \\sigma= 1+\\psi$. We explain how the physical fusion of vortex-antivortex pairs allows us to use these rules to read out the information encoded in the topologically protected space of degenerate ground states. We comment on the potential applicability of this fact to quantum computation. Modified 11/30/05 to reflect manuscript as accepted for publication. Includes corrected last section.

Michael Stone; Suk Bum Chung

2005-11-30T23:59:59.000Z

456

All-Optical Production of quantum degeneracy and molecular BEC of $^6$Li  

E-Print Network [OSTI]

We achieve a highly degenerate and strongly interacting Fermi gas in a mixture of the two lowest hyperfine states of $^6$Li by direct evaporative cooling in a high power crossed optical dipole trap. The trap is loaded from a large atom number magneto-optical trap (MOT) which is realized by a laser system of 2.5-watts intracavity-frequency-doubled light output at 671 nm. With this system, we also demonstrate the production of a molecular Bose-Einstein condensates (mBEC), and observe the anisotropic expansion of Fermi gases in the so-called BEC-BCS crossover regime.

Shujing Deng; Pengpeng Diao; Qianli Yu; Haibin Wu

2015-02-01T23:59:59.000Z

457

All-Optical Production of quantum degeneracy and molecular BEC of $^6$Li  

E-Print Network [OSTI]

We achieve a highly degenerate and strongly interacting Fermi gas in a mixture of the two lowest hyperfine states of $^6$Li by direct evaporative cooling in a high power crossed optical dipole trap. The trap is loaded from a large atom number magneto-optical trap (MOT) which is realized by a laser system of 2.5-watts intracavity-frequency-doubled light output at 671 nm. With this system, we also demonstrate the production of a molecular Bose-Einstein condensates (mBEC), and observe the anisotropic expansion of Fermi gases in the so-called BEC-BCS crossover regime.

Deng, Shujing; Yu, Qianli; Wu, Haibin

2015-01-01T23:59:59.000Z

458

Generalized Electric Polarizability of the Proton from Skyrme Model  

E-Print Network [OSTI]

We calculate the electric polarizability $\\alpha(q^2)$ of the proton in virtual Compton scattering using the Skyrme model. The $q^2$ dependence of the polarizability is comparable with the predictions obtained from the non-relativistic quark model and the linear sigma model. The chiral behaviors of our $\\alpha(0)$ and $d^2\\alpha(0)/d^2q^2$ agree with the results of the chiral perturbation theory. The discrepancy can be traced back to the contribution of the intermediate $\\Delta$ state degenerate with the $N$ which is a characteristic of a large-$N_C$ model.

Myunggyu Kim; Dong-Pil Min

1997-04-23T23:59:59.000Z

459

Ultrafast coherent control of angular momentum during a one-photon excitation  

SciTech Connect (OSTI)

The subpicosecond dynamics of angular momentum transfer in the excited rubidium 5p state is studied in real time by observing photoelectron angular distributions with velocity map imaging. Retrieving the populations of the degenerate Zeeman levels and reconstructing the angular momentum, we show that in the case of resonant excitation the angular momentum does not follow the momentary helicity of the electric field of the pulse. This is in contrast with off-resonant excitation where the angular momentum and pulse helicity are fully correlated. Our study shows how to generate and shape ultrashort pulses of orbital and spin angular momentum in a controllable way.

Malik, D. A.; Eppink, A. T. J. B.; Meerts, W. L.; Kimel, A. V.; Kirilyuk, A.; Rasing, Th.; Zande, W. J. van der [Radboud University Nijmegen, Institute for Molecules and Materials, P.O. Box 9010, NL-6500 GL Nijmegen (Netherlands)

2011-10-15T23:59:59.000Z

460

A self-injected, diode-pumped, solid-state ring laser for laser cooling of Li atoms  

E-Print Network [OSTI]

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.

Miake, Yudai; O'Hara, Kenneth M; Gensemer, Stephen

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Realization of Topological Quantum Computation with surface codes  

E-Print Network [OSTI]

In this paper, the degenerate ground states of Z2 topological order on a plane with holes (the so-called surface codes) are used as the protected code subspace to build a topological quantum computer by tuning their quantum tunneling effect. Using a designer Hamiltonian - the Kitaev toric-code model as an example, we study quantum tunneling effects of the surface codes and obtain its effective theory. Finally, we show how to do topological quantum computation including the initialization, the unitary transformation and the measurement.

Su-Peng Kou

2009-05-08T23:59:59.000Z

462

Power enhancement of heat engines via correlated thermalization in multilevel systems  

E-Print Network [OSTI]

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.

David Gelbwaser-Klimovsky; Wolfgang Niedenzu; Paul Brumer; Gershon Kurizki

2014-11-05T23:59:59.000Z

463

Coherence Induced by Incoherent Pumping Field and Decay Process in Three-level $?$ Type Atomic System  

E-Print Network [OSTI]

Following the method of Victor V. Kozlov et al.[PhysRevA. 74. 063829],we inspect the coherence induced by incoherent pump and spontaneous decay process in $\\Lambda$ type three-level atomic system with degenerated lower duplicate levels. The system shows a coherent population trapping state and multi-steady states characteristic in different conditions. Interestingly, two kinds of steady states generated by the system in different sets of pumping and decaying parameters, the "singlet" state and the "triplet" state, exhibit stable or unstable characteristics under the action of pumping field and vacuum reservoir, which promise fruitful applications to atomic coherence and interference in quantum optics.

Bao-Quan Ou; Lin-Mei Liang; Cheng-Zu Li

2007-12-25T23:59:59.000Z

464

Ultrametric Fewnomial Theory  

E-Print Network [OSTI]

. Khovanskii?s results imply that a square system of n real polynomial equations in n variables with total t terms has at most (n+1)t2t(t?1)/2 non-degenerate roots in the positive orthant. Khovanskii?s bound was improved by the work of F. Bihan and F. Sottile.... For more details see [12], [15], [17] and [21]. 1. What Are the p-adic Numbers? Let Q denote the set of rational numbers, we can construct a norm on Q in the following way: Let p be a prime number, and for any integer a ? Z, define the p-adic valuation of a...

Ibrahim Abdelhalim, Ashraf

2011-02-22T23:59:59.000Z

465

Chirped-pulse manipulated carrier dynamics in low-temperature molecular-beam-epitaxy grown GaAs  

SciTech Connect (OSTI)

Chirped pulse controlled carrier dynamics in low-temperature molecular-beam-epitaxy grown GaAs are investigated by degenerate pump-probe technique. Varying the chirped condition of excited pulse from negative to positive increases the carrier relaxation time so as to modify the dispersion and reshape current pulse in time domain. The spectral dependence of carrier dynamics is analytically derived and explained by Shockley-Read Hall model. This observation enables the new feasibility of controlling carrier dynamics in ultrafast optical devices via the chirped pulse excitations.

Lee, Chao-Kuei, E-mail: chuckcklee@yahoo.com [Department of Photonics, National Sun-Yat-Sen University, Kaohsiung 80400, Taiwan (China); Lin, Yuan-Yao [Department of Electrical Engineering, Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30010, Taiwan (China); Lin, Sung-Hui [Department of Photonics, National Chiao Tung University, Hsinchu 30010, Taiwan (China); Lin, Gong-Ru [Department of Electrical Engineering, Graduate Institute of Photonics and Optoelectronics, National Taiwan University, No. 1, Roosevelt Road, Sec. 4, Taipei 10617, Taiwan (China); Pan, Ci-Ling [Department of Photonics, National Chiao Tung University, Hsinchu 30010, Taiwan (China); Department of Physics, National Tsing Hwa University, Hsinchu 30010, Taiwan (China)

2014-04-28T23:59:59.000Z

466

Low-noise on-chip frequency conversion by four-wave-mixing Bragg scattering in SiNx waveguides  

E-Print Network [OSTI]

Low-noise, tunable wavelength-conversion through non-degenerate four-wave mixing Bragg scattering in SiNx waveguides is experimentally demonstrated. Finite element method simulations of waveguide dispersion are used with the split-step Fourier method to predict device performance, and indicate a strong dependence of the conversion efficiency on phase matching, which is controlled by the waveguide geometry. Two 1550 nm wavelength band pulsed pumps are used to achieve tunable conversion of a 980 nm signal over a range of 5 nm with a peak conversion efficiency of \\approx 5 %. The demonstrated Bragg scattering process is suitable for frequency conversion of quantum states of light.

Imad Agha; Marcelo Davanco; Bryce Thurston; Kartik Srinivasan

2012-06-12T23:59:59.000Z

467

Frequency-Rank Correlations of Rhodopsin Mutations with Tuned Hydropathic Roughness Based on Self-Organized Criticality  

E-Print Network [OSTI]

The behavior of disease-linked mutations of membrane proteins is especially simple in rhodopsin, where they are well-studied, as they are responsible for retinitis pigmentosa, RP (retinal degeneration). Here we show that the frequency of occurrence of single RP mutations is strongly influenced by their posttranslational survival rates, and that this survival correlates well (82%) with a long-range, non-local hydropathic measure of the roughness of the water interfaces of ex-membrane rhodopsin based on self-organized criticality (SOC). It is speculated that this concept may be generally useful in studying survival rates of many mutated proteins.

J. C. Phillips

2012-01-05T23:59:59.000Z

468

Gravity-analogy in one-dimensional ideal Fermi fluids and Burgers' equation  

E-Print Network [OSTI]

An hydrodynamic description of a one-dimensional flow of an ideal Fermi fluid is constructed from a semiclassical approximation. For an initially fully degenerate fluid, Euler and continuity hydrodynamic equations are dual to two uncoupled inviscid Burgers' equations. Yet the price for the initial simplicity of the description is paid by the complexity of non-linear instabilities towards possible turbulent evolutions. Nevertheless, it is shown that linear long-wavelength density perturbations on a stationary flow are generically stable. Consequently, linear sound obeys a wave equation with analogy to gravity. The results have applications for ultra-cold atomic gases.

Stefano Giovanazzi

2010-10-14T23:59:59.000Z

469

The Chern-Simons diffusion rate from higher curvature gravity  

E-Print Network [OSTI]

An important transport coefficient in the study of non-Abelian plasmas is the Chern-Simons diffusion rate, which parameterizes the rate of transition among the degenerate vacua of a gauge theory. We compute this quantity at strong coupling, via holography, using two theories of gravity with higher curvature corrections, namely Gauss-Bonnet gravity and quasi-topological gravity. We find that these corrections may either increase or decrease the result obtained from Einstein's gravity, depending on the value of the couplings. The Chern-Simons diffusion rate for Gauss-Bonnet gravity decreases as the shear viscosity over entropy ratio is increased.

Viktor Jahnke; Anderson Seigo Misobuchi; Diego Trancanelli

2014-03-13T23:59:59.000Z

470

Direct Production of Tripartite Pump-Signal-Idler Entanglement in the Above-Threshold Optical Parametric Oscillator  

E-Print Network [OSTI]

We calculate the quantum correlations existing among the three output fields (pump, signal, and idler) of a triply resonant non-degenerate Optical Parametric Oscillator operating above threshold. By applying the standard criteria [P. van Loock and A. Furusawa, Phys. Rev. A 67, 052315 (2003)], we show that strong tripartite continuous-variable entanglement is present in this well-known and simple system. Furthermore, since the entanglement is generated directly from a nonlinear process, the three entangled fields can have very different frequencies, opening the way for multicolored quantum information networks.

A. S. Villar; M. Martinelli; C. Fabre; P. Nussenzveig

2006-10-09T23:59:59.000Z

471

Interstat Issue 15  

E-Print Network [OSTI]

was born December 20, 1978 to Wende and Jimmy Doohan at 4:13am. Weight 8 lbs., 6oz. Congratulations to the happy family. The principal filming on STAR TREK: THE MOTION PICTURE is finished; however, everything is not completed and there are some scenes still... cussion remained level-headed, intelligent. INTERSTAT, on the other hand, has degenerated to a cat fight—everyone seeing who can scream the loudest and longest—and I see little if any real discussion. I can't even think of a single constructive discussion...

1979-01-01T23:59:59.000Z

472

Weak chimeras in minimal networks of coupled phase oscillators  

E-Print Network [OSTI]

We suggest a definition for a type of chimera state that appears in networks of indistinguishable phase oscillators. Defining a "weak chimera" as a type of invariant set showing partial frequency synchronization, we show that this means they cannot appear in phase oscillator networks that are either globally coupled or too small. We exhibit various networks of four, six and ten indistinguishable oscillators where weak chimeras exist with various dynamics and stabilities. We examine the role of Kuramoto-Sakaguchi coupling in giving degenerate (neutrally stable) families of weak chimera states in these example networks.

Peter Ashwin; Oleksandr Burylko

2014-12-10T23:59:59.000Z

473

Nonlinear optics via double dark resonances  

E-Print Network [OSTI]

resonant state, u0&'ud& 1Vc /Vua&, has a small admixture of the excited state, and thus it decays very slowly, which results in a very narrow resonance. In this picture, it is easy to prove that in the all- resonant case, detuning the field Vc by nRF... implies a fre- quency shift of the novel resonance line by nRF . The experiment described in this paper follows a slightly different setup. The states uc& and ud& are degenerate ~i.e., Zeeman sublevels!, whereas the new field, a RF field, has...

Yelin, S. F.; Sautenkov, V. A.; Kash, M. M.; Welch, George R.; Lukin, M. D.

2003-01-01T23:59:59.000Z

474

Spectral convexity for attractive SU(2N) fermions  

E-Print Network [OSTI]

We prove a general theorem on spectral convexity with respect to particle number for 2N degenerate components of fermions. The number of spatial dimensions is arbitrary, and the system may be uniform or constrained by an external potential. We assume only that the interactions are governed by an SU(2N)-invariant two-body potential whose Fourier transform is negative definite. The convexity result implies that the ground state is in a 2N-particle clustering phase. We discuss implications for light nuclei as well as asymmetric nuclear matter in neutron stars.

Dean Lee

2007-01-28T23:59:59.000Z

475

Hamilton-Jacobi Approach for First Order Actions and Theories with Higher Derivatives  

E-Print Network [OSTI]

In this work we analyze systems described by Lagrangians with higher order derivatives in the context of the Hamilton-Jacobi formalism for first order actions. Two different approaches are studied here: the first one is analogous to the description of theories with higher derivatives in the hamiltonian formalism according to [Sov. Phys. Journ. 26 (1983) 730; the second treats the case where degenerate coordinate are present, in an analogy to reference [Nucl. Phys. B 630 (2002) 509]. Several examples are analyzed where a comparison between both approaches is made.

M. C. Bertin; B. M. Pimentel; P. J. Pompeia

2007-01-29T23:59:59.000Z

476

Quarkonium mass splittings with Fermilab heavy quarks and 2+1 flavors of improved staggered sea quarks  

E-Print Network [OSTI]

We present results from an ongoing lattice study of the lowest lying charmonium and bottomonium level splittings using the Fermilab heavy quark formalism. Our objective is to test the performance of this action on MILC-collaboration ensembles of (2+1) flavors of light improved staggered (asqtad) quarks. Measurements are done on 16 ensembles with degenerate up and down quarks of various masses, thus permitting a chiral extrapolation, and over lattice spacings ranging from 0.09 fm to 0.18 fm, thus permitting study of lattice-spacing dependence. We examine combinations of the mass splittings that are sensitive to components of the effective quarkonium potential.

T. Burch; C. E. DeTar; M. Di Pierro; A. X. El-Khadra; Steven Gottlieb; A. S. Kronfeld; L. Levkova; P. B. Mackenzie; J. Simone

2009-11-02T23:59:59.000Z

477

Atmospheric and Solar neutrinos in the light of the SuperKamiokande results  

E-Print Network [OSTI]

The hierarchy $\\Delta m^2_{atm} \\gg \\Delta m^2_\\odot$ and the large $\\theta_{23}$ mixing angle, as suggested by neutrino oscillation experiments, can be accounted for by a variety of lepton flavour models. A dichotomy emerges: i) Models were all neutrino masses are bounded by $m_{atm}\\equiv (\\Delta m^2_{atm})^{1/2}\\approx 0.03 eV$; ii) Models of quasi-degenerate neutrinos. It is shown how these different patterns of neutrino masses may arise from different lepton flavour symmetries. Physical implications are discussed in the various cases.

Riccardo Barbieri

1999-01-07T23:59:59.000Z

478

Influence of pump-phase fluctuations on entanglement generation using a correlated spontaneous-emission laser  

E-Print Network [OSTI]

_qamar@pieas.edu.pk ?Electronic address: zubairy@tamu.edu PHYSICAL REVIEW A 75, 062305 #1;2007#2; 1050-2947/2007/75#1;6#2;/062305#1;10#2; 2007 The American Physical Society062305-1 field inside a doubly resonant cavity. The dipole allowed transitions #5;a#6;-#5;b#6; and #5;b#6;-#5...;c#6; are resonantly coupled with the two non-degenerate modes #1;1 and #1;2 of the cavity, while the forbidden transition #5;a#6;-#5;c#6; is induced by applying a strong magnetic field for magnetic dipole allowed transition. The Hamiltonian...

Qamar, Shahid; Xiong, Han; Zubairy, M. Suhail

2007-01-01T23:59:59.000Z

479

Tropical Limit in Statistical Physics  

E-Print Network [OSTI]

Tropical limit for macroscopic systems in equilibrium defined as the formal limit of Boltzmann constant k going to 0 is discussed. It is shown that such tropical limit is well-adapted to analyse properties of systems with highly degenerated energy levels, particularly of frustrated systems like spin ice and spin glasses. Tropical free energy is a piecewise linear function of temperature, tropical entropy is a piecewise constant function and the system has energy for which tropical Gibbs' probability has maximum. Properties of systems in the points of jump of entropy are studied. Systems with finite and infinitely many energy levels and phenomena of limiting temperatures are discussed.

M. Angelelli; B. Konopelchenko

2015-02-04T23:59:59.000Z

480

Beam excited acoustic instability in semiconductor quantum plasmas  

SciTech Connect (OSTI)

The instability of hole-Acoustic waves due to electron beam in semiconductor quantum plasmas is examined using the quantum hydrodynamic model. The quantum effects are considered including Bohm potential, Fermi degenerate pressure, and exchange potential of the semiconductor quantum plasma species. Our model is applied to nano-sized GaAs semiconductor plasmas. The variation of the growth rate of the unstable mode is obtained over a wide range of system parameters. It is found that the thermal effects of semiconductor species have significance over the hole-Acoustic waves.

Rasheed, A.; Siddique, M.; Huda, F. [Department of Physics, Government College University, Faisalabad 38000 (Pakistan); Jamil, M. [Department of Physics, COMSATS Institute of Information Technology, Lahore 54000 (Pakistan); Jung, Y.-D. [Department of Applied Physics and Department of Bionanotechnology, Hanyang University, Ansan, Kyunggi-Do 426-791 (Korea, Republic of)

2014-06-15T23:59:59.000Z

Note: This page contains sample records for the topic "age-related macular degeneration" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Do we need the $W^{(n>3)}$ constraints to solve the $(1,q)$ models coupled to 2D gravity?  

E-Print Network [OSTI]

We prove that all the correlation functions in the $(1,q)$ models are calculable using only the Virasoro and the $W^{(3)}$ constraints. This result is based on the invariance of correlators with respect to an interchange of the order of the operators they contain. In terms of the topological recursion relations, it means that only two and three contacts and the corresponding degenerations of the underlying surfaces are relevant. An algorithm to compute correlators for any $q$ and at any genus is presented and demonstrated through some examples. On route to these results, some interesting polynomial identities, which are generalizations of Abel's identity, were discovered. }

Lavi, Y

1994-01-01T23:59:59.000Z

482

Further investigation of electronic multiplication of voltages by use of logarithms  

E-Print Network [OSTI]

equivalent circuit of Figure 11. It has been assumed that the gas tubes by-passed with the . 0 1 ufd condenser contribute no time con? stants in the circuit. The element Ra represents the parallel combination of the 2 0 , 0 0 0 ohm cathode resistor.... This divider is by-passed, with a 0.01 ufd condenser so that degeneration due to the action of Cgp will not occur at high frequencies. Since % > ? , the gain of 9m this stage is A4 - e - , (27) and the output resistance is r 4 - /.A f ? (28) c/Lp 4...

Biard, James Robert

1957-01-01T23:59:59.000Z

483

Model for l/f Flux Noise in SQUIDs and Qubits  

E-Print Network [OSTI]

We propose a model for 1/f flux noise in superconducting devices (f is frequency). The noise is generated by the magnetic moments of electrons in defect states which they occupy for a wide distribution of times before escaping. A trapped electron occupies one of the two Kramers-degenerate ground states, between which the transition rate is negligible at low temperature. As a result, the magnetic moment orientation is locked. Simulations of the noise produced by randomly oriented defects with a density of 5*10^17 m^-2 yield 1/f noise magnitudes in good agreement with experiments.

Roger H. Koch; David P. DiVincenzo; John Clarke

2007-05-15T23:59:59.000Z

484

Enhancement of Field Squeezing Using Coherent Feedback  

E-Print Network [OSTI]

The theory of quantum feedback networks has recently been developed with the aim of showing how quantum input-output components may be connected together so as to control, stabilize or enhance the performance of one of the subcomponents. In this paper we show how the degree to which an idealized component (a degenerate parametric amplifier in the strong-coupling regime) can squeeze input fields may be enhanced by placing the component in-loop in a simple feedback mechanism involving a beam splitter. We study the spectral properties of output fields, placing particular emphasis on the elastic and inelastic components of the power density.

J. E. Gough; S. Wildfeuer

2009-08-22T23:59:59.000Z

485

Dark matter conversion as a source of boost factor for explaining the cosmic ray positron and electron excesses  

E-Print Network [OSTI]

In interacting multi-component dark matter (DM) models, if the DM components are nearly degenerate in mass and the interactions between them are strong enough, the relatively heavy DM components can be converted into lighter ones at late time after the thermal decoupling. Consequently, the relic density of the lightest DM component can be considerably enhanced at late time. This may contribute to an alternative source of boost factor required to explain the positron and electron excesses reported by the recent DM indirect search experiments such as PAMELA, Fermi-LAT and HESS etc..

Ze-Peng Liu; Yue-Liang Wu; Yu-Feng Zhou

2011-12-17T23:59:59.000Z

486

Energy landscape of a simple model for strong liquids  

E-Print Network [OSTI]

We calculate the statistical properties of the energy landscape of a minimal model for strong network-forming liquids. Dynamics and thermodynamic properties of this model can be computed with arbitrary precision even at low temperatures. A degenerate disordered ground state and logarithmic statistics for the energy distribution are the landscape signatures of strong liquid behavior. Differences from fragile liquid properties are attributed to the presence of a discrete energy scale, provided by the particle bonds, and to the intrinsic degeneracy of topologically disordered networks.

A. J. Moreno; S. V. Buldyrev; E. La Nave; I. Saika-Voivod; F. Sciortino; P. Tartaglia; E. Zaccarelli

2005-10-04T23:59:59.000Z

487

Harmonic oscillator in twisted Moyal plane: eigenvalue problem and relevant properties  

E-Print Network [OSTI]

The paper reports on a study of a harmonic oscillator (ho) in the twisted Moyal space, in a well defined matrix basis, generated by the vector fields $X_{a}=e_{a}^{\\mu}(x)\\partial_{\\mu}=(\\delta_{a}^{\\mu}+\\omega_{ab}^{\\mu}x^{b})\\partial_{\\mu}$, which induce a dynamical star product. The usual multiplication law can be hence reproduced in the $\\omega_{ab}^{\\mu}$ null limit. The star actions of creation and annihilation functions are explicitly computed. The ho states are infinitely degenerate with energies depending on the coordinate functions.

Mahouton Norbert Hounkonnou; Dine Ousmane Samary

2010-08-07T23:59:59.000Z

488

On the harmonic oscillator properties in a twisted Moyal plane  

E-Print Network [OSTI]

This work prolongs, using an operator method, the investigations started in our recent paper J. Math. Phys. 51., 102108 on the spectrum and states of the harmonic oscillator on twisted Moyal plane, where rather a Moyal-star-algebraic approach was used. The physical spectrum and states of the harmonic oscillator on twisted Moyal space, obtained here by solving the corresponding differential equation, are similar to those of the ordinary Moyal space, with different parameters. This fortunately contrasts with the previous study which produced unexpected results, i.e. infinitely degenerate states with energies depending on the coordinate functions.

Ezinvi Baloitcha; Mahouton Norbert Hounkonnou; Dine Ousmane Samary

2012-03-25T23:59:59.000Z

489

Study on metal nanoparticles induced third-order optical nonlinearity in phenylhydrazone derivatives with DFWM technique  

SciTech Connect (OSTI)

The third-order nonlinear optical properties of newly synthesized phenylhydrazone derivatives and the influence of noble metal nanoparticles (Ag and Au) on their nonlinear optical responses were investigated by employing Degenerate Four wave Mixing (DFWM) technique with a 7 nanosecond, 10Hz Nd: YAG laser pulses at 532nm. Metal nanoparticles were prepared by laser ablation and the particle formation was confirmed using UV-Visible spectroscopy, Transmission Electron Microscopy (TEM). The nonlinear optical susceptibility were measured and found to be of the order 10{sup ?13}esu. The results are encouraging and conclude that the materials are promising candidate for future optical device applications.

Sudheesh, P.; Chandrasekharan, K. [Laser and Nonlinear Optics Laboratory, Department of Physics, National Institute of Technology Calicut (India); Rao, D. Mallikharjuna [Nano Display Laboratory, School of Nanoscience and Technology, National Institute of Technology Calicut (India)

2014-01-28T23:59:59.000Z

490

Limits on the Majorana neutrino mass in the 0.1 eV range  

E-Print Network [OSTI]

The Heidelberg-Moscow experiment gives the most stringent limit on the Majorana neutrino mass. After 24 kg yr of data with pulse shape measurements, we set a lower limit on the half-life of the neutrinoless double beta decay in 76Ge of T_1/2 > 5.7 * 10^{25} yr at 90% C.L., thus excluding an effective Majorana neutrino mass greater than 0.2 eV. This allows to set strong constraints on degenerate neutrino mass models.

L. Baudis; A. Dietz; G. Heusser; H. V. Klapdor-Kleingrothaus; I. V. Krivosheina; St. Kolb; B. Majorovits; V. F. Melnikov; H. Paes; F. Schwamm; H. Strecker; V. Alexeev; A. Balysh; A. Bakalyarov; S. T. Belyaev; V. I. Lebedev; S. Zhukov

1999-02-10T23:59:59.000Z

491

Casimir interaction from magnetically coupled eddy currents  

E-Print Network [OSTI]

We study the Casimir interaction due to eddy (Foucault) currents in thick metallic plates. The Drude model is used to describe the optical response of the metal at low frequencies. A repulsive force arises from the electromagnetic coupling between chargeless currents filling the metallic half-spaces. We show that these overdamped modes are entirely responsible for the thermal anomalies of the Casimir force between good conductors. It turns out that the applicability of the Nernst heat theorem (third law of thermodynamics) must be reviewed since the ground state of the coupled metal+field system can become highly degenerate at zero temperature.

Intravaia, Francesco

2009-01-01T23:59:59.000Z

492

Two-bit Deutsch-Jozsa algorithm using an atomic ensemble  

E-Print Network [OSTI]

The first optical proposal for the realization of the two-bit version of the Deutsch-Jozsa algorithm [D. Deutsch and R. Jozsa, Proc. R. Soc. London A {\\bf 493}, 553 (1992)] is presented. The proposal uses Stark shifts in an ensemble of atoms and degenerate sources of photons. The photons interact dispersively with an atomic ensemble, leading to an effective Hamiltonian in atom-field basis, which is useful for performing the required two-qubit operations. Combining these with a set of one-qubit operations, the algorithm can be implemented. A discussion of the experimental feasibility of the proposal is given.

Shubhrangshu Dasgupta; G. S. Agarwal

2006-01-16T23:59:59.000Z

493

Inert scalar dark matter in an extra dimension inspired model  

E-Print Network [OSTI]

In this paper we analyze a dark matter model inspired by theories with extra dimensions. The dark matter candidate corresponds to the first Kaluza-Klein mode of a real scalar added to the Standard Model. The tower of new particles enriches the calculation of the relic abundance. For large mass splitting, the model converges to the predictions of the inert singlet dark matter model. For nearly degenerate mass spectrum, coannihilations increase the cross-sections used for direct and indirect dark matter searches. Moreover, the Kaluza-Klein zero mode can mix with the SM higgs and further constraints can be applied.

R. A. Lineros; F. A. Pereira dos Santos

2014-11-12T23:59:59.000Z

494

Towards the correspondence between Q-clouds and sphalerons  

E-Print Network [OSTI]

Non-linear classical equations of motion may admit degenerate solutions at fixed charges. While the solutions with lower energies are classically stable, the ones with larger energies are unstable and refereed as Q-clouds. We consider a theory in which the homogeneous charged condensate is classically stable and argue that Q-clouds correspond to sphalerons between the stable Q-balls and the condensate. For the model with analytic solution, we present Arrhenius formula for the quantum production of Q-balls from the condensate at large temperatures.

Nugaev, Emin

2015-01-01T23:59:59.000Z

495

Two-Point Phase Correlations of a One-Dimensional Bosonic Josephson Junction  

SciTech Connect (OSTI)

We realize a one-dimensional Josephson junction using quantum degenerate Bose gases in a tunable double well potential on an atom chip. Matter wave interferometry gives direct access to the relative phase field, which reflects the interplay of thermally driven fluctuations and phase locking due to tunneling. The thermal equilibrium state is characterized by probing the full statistical distribution function of the two-point phase correlation. Comparison to a stochastic model allows us to measure the coupling strength and temperature and hence a full characterization of the system.

Betz, T.; Manz, S.; Buecker, R.; Berrada, T.; Koller, Ch.; Schmiedmayer, J. [Vienna Center for Quantum Science and Technology, Atominstitut, TU-Wien, 1020 Vienna (Austria); Kazakov, G. [Wolfgang Pauli Institute, University of Vienna, 1090 Vienna (Austria); St. Petersburg State Polytechnic University, 195251 St. Petersburg (Russian Federation); Mazets, I. E. [Vienna Center for Quantum Science and Technology, Atominstitut, TU-Wien, 1020 Vienna (Austria); Wolfgang Pauli Institute, University of Vienna, 1090 Vienna (Austria); Ioffe Physico-Technical Institute, 194021 St. Petersburg (Russian Federation); Stimming, H.-P. [Wolfgang Pauli Institute, University of Vienna, 1090 Vienna (Austria); Perrin, A.; Schumm, T. [Vienna Center for Quantum Science and Technology, Atominstitut, TU-Wien, 1020 Vienna (Austria); Wolfgang Pauli Institute, University of Vienna, 1090 Vienna (Austria)

2011-01-14T23:59:59.000Z

496

Cotton flow  

E-Print Network [OSTI]

Using the conformally invariant Cotton tensor, we define a geometric flow, the "Cotton flow", which is exclusive to three dimensions. This flow tends to evolve the initial metrics into conformally flat ones, and is somewhat orthogonal to the Yamabe flow, the latter being a flow within a conformal class. We define an entropy functional, and study the flow of nine homogeneous spaces both numerically and analytically. In particular, we show that the arbitrarily deformed homogeneous 3-sphere flows into the round 3-sphere. Two of the nine homogeneous geometries, which are degenerated by the Ricci flow, are left intact by the Cotton flow.

Ali Ulas Ozgur Kisisel; Ozgur Sarioglu; Bayram Tekin

2008-06-17T23:59:59.000Z

497

Study on photonic angular momentum states in coaxial magneto-optical waveguides  

SciTech Connect (OSTI)

By rigorously solving Maxwell's equations, we develop a full-wave electromagnetic theory for the study of photonic angular momentum states (PAMSs) in coaxial magneto-optical (MO) waveguides. Paying attention to a metal-MO-metal coaxial configuration, we show that the dispersion curves of the originally degenerated PAMSs experience a splitting, which are determined by the off-diagonal permittivity tensor element of the MO medium. We emphasize that this broken degeneracy in dispersion relation is accompanied by modified distributions of field component and transverse energy flux. A qualitative analysis about the connection between the split dispersion behavior and the field distribution is provided. Potential applications are discussed.

Yang, Mu; Wu, Li-Ting; Guo, Tian-Jing; Guo, Rui-Peng; Cui, Hai-Xu; Cao, Xue-Wei; Chen, Jing, E-mail: jchen4@nankai.edu.cn [MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin 300071 (China)

2014-10-21T23:59:59.000Z

498

Entanglement generation in the ultra-strongly coupled Rabi model  

E-Print Network [OSTI]

We analyze the dynamics of the quantum Rabi model for two qubits interacting through a common bosonic field mode (resonator), focusing on the generation and detection of maximally entangled Bell states. We obtain analytical results for the unitary dynamics of this system in the slow-qubit (or degenerate) regime, considering ultra-strong coupling between qubits and resonator mode, for which the rotating wave approximation is no longer applicable. We also numerically investigate the dynamics beyond the slow-qubit condition in order to study the validity of the model in the presence of less strict conditions.

Matteo Bina; Stefano Maffezzoli Felis; Stefano Olivares

2014-10-23T23:59:59.000Z

499

Radiative decay of keV-mass sterile neutrinos in a strongly magnetized plasma  

E-Print Network [OSTI]

The radiative decay of sterile neutrinos with typical masses of 10 keV is investigated in the presence of a strong magnetic field and degenerate plasma. Full account is taken of the strongly modified photon dispersion relation relative to vacuum. The limiting cases of relativistic and non-relativistic plasma are analyzed. The decay rate in a strongly magnetized plasma as a function of the electron number density is compared with the un-magnetized case. We find that a strong magnetic field suppresses the catalyzing influence of the plasma on the decay rate.

Alexandra A. Dobrynina; Nicolay V. Mikheev; Georg G. Raffelt

2015-01-07T23:59:59.000Z

500

Nucleon electromagnetic form factors from twisted mass lattice QCD  

E-Print Network [OSTI]

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.

Abdou Abdel-Rehim; Constantia Alexandrou; Martha Constantinou; Kyriakos Hadjiyiannakou; Karl Jansen; Giannis Koutsou

2015-01-07T23:59:59.000Z