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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

Medical Progress: Age-Related Macular Degeneration  

Science Journals Connector (OSTI)

...blurred vision, visual scotomas, decreased contrast sensitivity, abnormal dark adaptation (difficulty adjusting from bright to dim lighting), and the need for brighter light or additional magnification to read small print. Gradual, insidious visual loss with central or pericentral visual scotomas typically... Age-related macular degeneration is the leading cause of irreversible blindness in people 50 years of age or older in the developed world. This article reviews the clinical and histopathological features of age-related macular degeneration and its genetics and epidemiology and discusses current management options and research advances.

Jager R.D.Mieler W.F.Miller J.W.

2008-06-12T23:59:59.000Z

2

Retinal Diseases: Age-Related Macular Degeneration and Retinitis Pigmentosa  

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

Retinal Diseases: Age-Related Macular Degeneration and Retinitis Pigmentosa Retinal Diseases: Age-Related Macular Degeneration and Retinitis Pigmentosa Age-related macular degeneration (AMD) is an eye disease primarily affecting the central vision regions in people age 60 and older. According to the Macular Degeneration Research Fund, a case of AMD is diagnosed in the United States every 3 minutes. Each year, 1.2 million of the estimated 12 million people with AMD will suffer severe vision loss. Patients with AMD have dark areas in their vision caused by fluid leakage or bleeding in the macula, the center of the retina that produces the sharpest vision. The brain initially compensates for these dark patches. Early cellular dysfunction or spotting in the macula may go undetected until the disease is in advanced stages.

3

Radiation Therapy for Neovascular Age-related Macular Degeneration  

SciTech Connect (OSTI)

In the enormity of the public health burden imposed by age-related macular degeneration (ARMD), much effort has been directed toward identifying effective and efficient treatments. Currently, anti-vascular endothelial growth factor (VEGF) injections have demonstrated considerably efficacy in treating neovascular ARMD, but patients require frequent treatment to fully benefit. Here, we review the rationale and evidence for radiation therapy of ARMD. The results of early photon external beam radiation therapy are included to provide a framework for the sequential discussion of evidence for the usage of stereotactic radiation therapy, proton therapy, and brachytherapy. The evidence suggests that these 3 modern modalities can provide a dose-dependent benefit in the treatment of ARMD. Most importantly, preliminary data suggest that all 3 can be used in conjunction with anti-VEGF therapeutics, thereby reducing the frequency of anti-VEGF injections required to maintain visual acuity.

Kishan, Amar U. [Harvard Medical School, Boston, Massachusetts (United States)] [Harvard Medical School, Boston, Massachusetts (United States); Modjtahedi, Bobeck S.; Morse, Lawrence S. [Department of Ophthalmology and Vision Sciences, University of California, Davis, Sacramento, California (United States)] [Department of Ophthalmology and Vision Sciences, University of California, Davis, Sacramento, California (United States); Lee, Percy, E-mail: percylee@mednet.ucla.edu [Department of Radiation Oncology, David Geffen School of Medicine at UCLA, Los Angeles, California (United States)] [Department of Radiation Oncology, David Geffen School of Medicine at UCLA, Los Angeles, California (United States)

2013-03-01T23:59:59.000Z

4

Proton beam therapy for age-related macular degeneration: development of a standard plan  

Science Journals Connector (OSTI)

Age-related macular degeneration is the leading cause of blindness in developing countries. Irradiating the exudative form, in which a choroidal neovascular membrane develops in the subfoveal area, is presently a treatment under investigation. In 1995, Massachusetts General Hospital, collaborating with Massachusetts Eye and Ear Infirmary, initiated a protocol to treat SCNV membranes using the proton beam at the Harvard Cyclotron Laboratory and the EYEPLAN program with a light-field setup. EYEPLAN requires the axial eye length, membrane dimensions, and manipulation of the eye to include a 4.0-mm radial margin around the membrane so that the aperture margin (50% isodose line on the posterior retina) abuts the inferior aspect of the limbus. Review of 100 individually prepared plans showed that 95% of the fabricated apertures were circular (aspect ratio standard plan. Thirty-nine plans were developed for axial lengths ranging from 21.0 to 25.0 mm and membrane sizes from 1.5 to 6.75 mm in the usual way as the reviewed ones. Circular targets were outlined centered on the fovea. Distal and proximal 90% ranges (modulation) to the target, and doses to macula, optic disc, lens, ciliary body, retina, and globe were calculated. An automated standard plan requiring the same input data, but avoiding the need for individual plans, was developed. The program outputs the aperture diameter, fixation angle for the light-field setup, range and modulation, and calculates dose to the macula and optic nerve and percentage of retina receiving ? 50% and ? 90% of the prescribed dose. Individual plans require approximately 1.5 hours; the standard plan, 5 minutes. The standard plan could have treated 86% of the reviewed plans. The automated plan provides accurate and efficient treatment parameters for the majority of patients.

Judy A Adams; Kenneth L Paiva; John E Munzenrider; Joan W Miller; Evangelos S Gragoudas

1999-01-01T23:59:59.000Z

5

Macular degeneration and visual icon use: deriving guidelines for improved access  

Science Journals Connector (OSTI)

The objective of this study was to derive empirical knowledge of the visual search strategies of computer users who suffer from age-related macular degeneration (AMD). This was accomplished by recording eye movem...

Julie A. Jacko; Armando B. Barreto…

2002-06-01T23:59:59.000Z

6

E-Print Network 3.0 - age-related retinal degeneration Sample...  

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

group of early onset blinding and retinal degenerations. Leber congenital amaurosis (LCA)1... day until they were 1 month old. Note the y axis scale. C, age-related...

7

CCR3 is a target for age-related macular degeneration diagnosis and therapy  

Science Journals Connector (OSTI)

... Am. J. Physiol. Lung Cell. Mol. Physiol. 284, L169–L178 (2003)Humbles, A. A. et al. A critical role for eosinophils in allergic airways remodeling ... inhibits choroidal neovascularization. Invest. Ophthalmol. Vis. Sci. 44, 2743–2749 (2003)Humbles, A. A. et al. The murine CCR3 receptor regulates both the role of ...

Atsunobu Takeda; Judit Z. Baffi; Mark E. Kleinman; Won Gil Cho; Miho Nozaki; Kiyoshi Yamada; Hiroki Kaneko; Romulo J. C. Albuquerque; Sami Dridi; Kuniharu Saito; Brian J. Raisler; Steven J. Budd; Pete Geisen; Ariel Munitz; Balamurali K. Ambati; Martha G. Green; Tatsuro Ishibashi; John D. Wright; Alison A. Humbles; Craig J. Gerard; Yuichiro Ogura; Yuzhen Pan; Justine R. Smith; Salvatore Grisanti; M. Elizabeth Hartnett; Marc E. Rothenberg; Jayakrishna Ambati

2009-06-14T23:59:59.000Z

8

Area deprivation and age related macular degeneration in the EPIC Norfolk Eye Study  

E-Print Network [OSTI]

, barriers to housing and services, crime and environment. The aggregate IMD is generated for each local super output area (LSOA) in England. Each LSOA is delineated using data from the 2001 census and has a minimum of 1000 residents, 400 households... and macula were taken using a TRC-NW6S non- mydriatic retinal camera and IMAGEnet Telemedicine System (Topcon Corporation, Tokyo, Japan) with a 10 megapixel Nikon D80 camera (Nikon Corporation, Tokyo, Japan) without pharmacological dilation of the pupil...

Yip, Jennifer L. Y.; Khawaja, Anthony P.; Chan, Michelle P. Y.; Broadway, David C.; Peto, Tunde; Luben, Robert; Hayat, Shabina; Bhaniani, Amit; Wareham, Nicholas; Foster, Paul J.; Khaw, Kay-Tee

2014-01-01T23:59:59.000Z

9

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

10

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

11

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

12

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 ...

13

E-Print Network 3.0 - antioxidant butylated hydroxytoluene Sample...  

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

University Collection: Environmental Sciences and Ecology ; Biology and Medicine 5 Evaluation of Potential Therapies for a Mouse Model of Human Age-Related Macular Degeneration...

14

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...

15

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

16

E-Print Network 3.0 - ageing-related signalling pathways Sample...  

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

in Cognitive Performance Summary: , although age-related decline in FA for the SLF was greater in the portion of this pathway anterior... research has established that...

17

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

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

is not clear. To conclude that white matter... and the superior longitudinal fasciculus (SLF). Mean FA values exhibited age-related decline consistent Source: Cabeza, Roberto -...

18

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...

19

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...

20

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...

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

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...

22

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

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

results for: age-related white matter Page: << < 1 2 3 4 5 > >> 1 Assessing Early Brain Development in Neonates by Segmentation of High-Resolution 3T MRI Summary: brain atlas...

23

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...

24

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...

25

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...

26

E-Print Network 3.0 - age-related molecular genetic Sample Search...  

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

maculopathy--population-based familial aggregation... , A.R., Snieder, H., Bird, A.C., Gilbert, C.E. and Spector, T.D. (2002) Genetic influence on early age-related... of...

27

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

28

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...

29

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:...

30

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

31

Age-related differences in the initial usability of mobile device icons Rock Leunga  

E-Print Network [OSTI]

Age-related differences in the initial usability of mobile device icons Rock Leunga *, Joanna Mc usability problems to address this issue, little work has looked at whether existing graphical icons study and a follow-up experimental study to determine which icon characteristics help initial icon

McGrenere, Joanna

32

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

33

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

34

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

35

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

36

On Degenerate Partial Differential Equations  

E-Print Network [OSTI]

Some of recent developments, including recent results, ideas, techniques, and approaches, in the study of degenerate partial differential equations are surveyed and analyzed. Several examples of nonlinear degenerate, even mixed, partial differential equations, are presented, which arise naturally in some longstanding, fundamental problems in fluid mechanics and differential geometry. The solution to these fundamental problems greatly requires a deep understanding of nonlinear degenerate partial differential equations. Our emphasis is on exploring and/or developing unified mathematical approaches, as well as new ideas and techniques. The potential approaches we have identified and/or developed through these examples include kinetic approaches, free boundary approaches, weak convergence approaches, and related nonlinear ideas and techniques. We remark that most of the important problems for nonlinear degenerate partial differential equations are truly challenging and still widely open, which require further new ideas, techniques, and approaches, and deserve our special attention and further efforts.

Gui-Qiang G. Chen

2010-05-15T23:59:59.000Z

37

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

38

A Monte Carlo algorithm for degenerate plasmas  

Science Journals Connector (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 ... Keywords: Degenerate plasma, Monte Carlo

A. E. Turrell; M. Sherlock; S. J. Rose

2013-09-01T23:59:59.000Z

39

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

40

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

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

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

42

The genetics of frontotemporal lobar degeneration  

Science Journals Connector (OSTI)

The clinical disorders associated with frontotemporal lobar degeneration (FTLD) are increasingly recognized as an important cause of early-onset dementia. Patients usually present with progressive changes in p...

Rosa Rademakers; Mike Hutton

2007-09-01T23:59:59.000Z

43

Shear viscosity of degenerate electron matter  

E-Print Network [OSTI]

We calculate the partial electron shear viscosity $\\eta_{ee}$ limited by electron-electron collisions in a strongly degenerate electron gas taking into account the Landau damping of transverse plasmons. The Landau damping strongly suppresses $\\eta_{ee}$ in the domain of ultrarelativistic degenerate electrons and modifies its %asymptotic temperature behavior. The efficiency of the electron shear viscosity in the cores of white dwarfs and envelopes of neutron stars is analyzed.

P. S. Shternin

2008-03-27T23:59:59.000Z

44

Buoyancy Instabilities in Degenerate, Collisional, Magnetized Plasmas  

E-Print Network [OSTI]

In low-collisionality plasmas, anisotropic heat conduction due to a magnetic field leads to buoyancy instabilities for any nonzero temperature gradient. We study analogous instabilities in degenerate {\\it collisional} plasmas, i.e., when the electron collision frequency is large compared to the electron cyclotron frequency. Although heat conduction is nearly isotropic in this limit, the small residual anisotropy ensures that collisional degenerate plasmas are also convectively unstable independent of the sign of the temperature gradient. We show that the range of wavelengths that are unstable is independent of the magnetic field strength, while the growth time increases with decreasing magnetic field strength. We discuss the application of these collisional buoyancy instabilities to white dwarfs and neutron stars. Magnetic tension and the low specific heat of a degenerate plasma significantly limit their effectiveness; the most promising venues for growth are in the liquid oceans of young, weakly magnetized n...

Chang, P

2009-01-01T23:59:59.000Z

45

NetComm: a network analysis tool based on communicability  

Science Journals Connector (OSTI)

......associated with other diseases. P-values are Bonferroni corrected Wilcox post hoc tests following a significant Kruskal-Wallis test. T1D, type 1 diabetes; T2D, type 2 diabetes; AMD, age-related macular degeneration; CHD, coronary......

Ian M. Campbell; Regis A. James; Edward S. Chen; Chad A. Shaw

2014-12-01T23:59:59.000Z

46

High-Frequency Conductivity of Degenerate Semiconductors  

Science Journals Connector (OSTI)

The problem of high-frequency conductivity of a degenerate semiconductor is investigated by a kinetic description. The finite duration of encounters is taken into account in a self-consistent fashion which properly includes collective effects. This treatment is an extension for quantum plasmas of the Dawson-Oberman method given for classical plasmas.

Amiram Ron and Narkis Tzoar

1963-09-01T23:59:59.000Z

47

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

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

Solving The Ising Problem Using Degenerate Optical Parametric Oscillators  

Science Journals Connector (OSTI)

A degenerate optical parametric oscillator network is proposed to solve the NP-hard problem of finding a ground state of the Ising Hamiltonian.

Wang, Zhe; Marandi, Alireza; Wen, Kai; Byer, Robert L; Yamamoto, Yoshihisa

51

VISCOSITY SOLUTIONS TO DEGENERATE COMPLEX MONGE-AMP`ERE EQUATIONS  

E-Print Network [OSTI]

VISCOSITY SOLUTIONS TO DEGENERATE COMPLEX MONGE-AMP`ERE EQUATIONS PHILIPPE EYSSIDIEUX, VINCENT an alternative approach based on the concept of viscosity solutions and compare systematically viscosity concepts PDE approach to second-order degenerate elliptic equations is the method of viscosity solutions

Boyer, Edmond

52

The fraction of double degenerates among DA white dwarfs  

E-Print Network [OSTI]

We present the results of a radial velocity survey designed to measure the fraction of double degenerates among DA white dwarfs. The narrow core of the H-alpha line was observed twice or more for 46 white dwarfs yielding radial velocities accurate to a few km/s. This makes our survey the most sensitive to the detection of double degenerates undertaken to date. We found no new double degenerates in our sample, though H-alpha emission from distant companions is seen in two systems. Two stars known to be double degenerates prior to our observations are included in the analysis. We find a 95% probability that the fraction of double degenerates among DA white dwarfs lies in the range [0.017,0.19].

P. F. L. Maxted; T. R. Marsh

1999-01-20T23:59:59.000Z

53

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

54

Crystallization and collapse in relativistically degenerate matter  

SciTech Connect (OSTI)

In this paper, it is shown that a mass density limit exists beyond which the relativistically degenerate matter would crystallize. The mass density limit, found here, is quite analogous to the mass limit predicted by Chandrasekhar for a type of compact stars called white dwarfs (M{sub Ch} Asymptotically-Equal-To 1.43 Solar Mass). In this study, the old problem of white dwarf core collapse, which has been previously investigated by Chandrasekhar using hydrostatic stability criteria, is revisited in the framework of the quantum hydrodynamics model by inspection of the charge screening at atomic scales in the relativistic degeneracy plasma regime taking into account the relativistic Fermi-Dirac statistics and electron interaction features such as the quantum statistical pressure, Coulomb attraction, electron exchange-correlation, and quantum recoil effects. It is revealed that the existence of ion correlation and crystallization of matter in the relativistically degenerate plasma puts a critical mass density limit on white dwarf core region. It is shown that a white dwarf star with a core mass density beyond this critical limit can undergo the spontaneous core collapse (SCC). The SCC phenomenon, which is dominantly caused by the electron quantum recoil effect (interference and localization of the electron wave function), leads to a new exotic state of matter. In such exotic state, the relativistic electron degeneracy can lead the white dwarf crystallized core to undergo the nuclear fusion and an ultimate supernova by means of the volume reduction (due to the enhanced compressibility) and huge energy release (due to the increase in cohesive energy), under the stars huge inward gravitational pressure. Moreover, it is found that the SCC phenomenon is significantly affected by the core composition (it is more probable for heavier plasmas). The critical mass density found here is consistent with the values calculated for core density of typical white dwarf stars.

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

2013-04-15T23:59:59.000Z

55

Ising-Bloch transition in 2D degenerate wave mixing  

Science Journals Connector (OSTI)

We show experimentally and theoretically the existence of a 2D Ising-Bloch transition in the field generated by degenerate four wave mixing in a BaTiO3-resonator.

Larionova, Yevgeniya; Peschel, Ulf; Esteban-Martin, Adolfo; Weiss, Carl Otto

56

Progranulin axis and recent developments in frontotemporal lobar degeneration  

Science Journals Connector (OSTI)

Recent data involving progranulin protein (PGRN) biology and frontotemporal lobar degeneration (FTLD), and the necessity of further elucidation of PGRN biology in FTLD-related neurodegeneration, is discussed by Nicholson and colleagues.

Alexandra M Nicholson; Jennifer Gass; Leonard Petrucelli; Rosa Rademakers

2012-01-23T23:59:59.000Z

57

Theory and proposal for a quantum-degenerate electron source  

E-Print Network [OSTI]

for a quantum-degenerate electron source M. Zolotorev, E. D.propose a pulsed electron source capable of a 6D brightnesspropose a pulsed electron source with brightness approaching

Zolotorev, Max; Commins, Eugene D.; Sannibale Fernando

2006-01-01T23:59:59.000Z

58

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

59

N=2 gauge theories and degenerate fields of Toda theory  

SciTech Connect (OSTI)

We discuss the correspondence between degenerate fields of the W{sub N} algebra and punctures of Gaiotto's description of the Seiberg-Witten curve of N=2 superconformal gauge theories. Namely, we find that the type of degenerate fields of the W{sub N} algebra, with null states at level one, is classified by Young diagrams with N boxes, and that the singular behavior of the Seiberg-Witten curve near the puncture agrees with that of W{sub N} generators. We also find how to translate mass parameters of the gauge theory to the momenta of the Toda theory.

Kanno, Shoichi; Matsuo, Yutaka; Shiba, Shotaro [Department of Physics, Faculty of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); Tachikawa, Yuji [School of Natural Sciences, Institute for Advanced Study, Princeton, New Jersey 08540 (United States)

2010-02-15T23:59:59.000Z

60

The sphericity of the complex of non-degenerate subspaces  

Science Journals Connector (OSTI)

......i-radical of Vi+1, p U, p (which is Vi U, p ) and to project it onto Vi+1, p U (which results in Vi, p U). In view...the sake of brevity in this remark, we allow ourselves the liberty to use some very heavy COMPLEX OF NON-DEGENERATE SUBSPACES......

Alice Devillers; Ralf Gramlich; Bernhard Mühlherr

2009-06-01T23:59:59.000Z

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

Quantum error correction with degenerate codes for correlated noise  

SciTech Connect (OSTI)

We introduce a quantum packing bound on the minimal resources required by nondegenerate error-correction codes for any kind of noise. We prove that degenerate codes can outperform nondegenerate ones in the presence of correlated noise, by exhibiting examples where the quantum packing bound is violated.

Chiribella, Giulio [Perimeter Institute for Theoretical Physics, 31 Caroline St. North, Waterloo, Ontario N2L 2Y5 (Canada); Dall'Arno, Michele; D'Ariano, Giacomo Mauro; Macchiavello, Chiara; Perinotti, Paolo [Quit group, Dipartimento di Fisica 'A. Volta', via Bassi 6, I-27100 Pavia (Italy); INFN Sezione di Pavia, via Bassi 6, I-27100 Pavia (Italy)

2011-05-15T23:59:59.000Z

62

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

63

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

64

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

65

Double degenerates and progenitors of supernovae type Ia  

E-Print Network [OSTI]

We report on systematic radial velocity surveys for white dwarf - white dwarf binaries (double degenerates - DDs) including SPY (ESO Supernovae Ia progenitor survey) recently carried out at the VLT. A large sample of DD will allow us to put strong constrains on the phases of close binary evolution of the progenitor systems and to perform an observational test of the DD scenario for supernovae of type Ia. We explain how parameters of the binaries can be derived from various methods. Results for a sample of DDs are presented and discussed.

R. Napiwotzki; L. Yungelson; G. Nelemans; T. R. Marsh; B. Leibundgut; A. Renzini; D. Homaier; D. Koester; S. Moehler; N. Christlieb; D. Reimers; H. Drechsel; U. Heber; C. Karl; E. -M. Pauli

2004-03-25T23:59:59.000Z

66

Integrable models and degenerate horizons in two-dimensional gravity  

E-Print Network [OSTI]

We analyse an integrable model of two-dimensional gravity which can be reduced to a pair of Liouville fields in conformal gauge. Its general solution represents a pair of ``mirror'' black holes with the same temperature. The ground state is a degenerate constant dilaton configuration similar to the Nariai solution of the Schwarzschild-de Sitter case. The existence of Birkhoff's theorem is then investigated in a more general context. We also point out some interesting features of the semiclassical theory of our model and the similarity with the behaviour of AdS$_2$ black holes.

Cruz, J; Navarro, D J; Navarro-Salas, J

2000-01-01T23:59:59.000Z

67

Integrable models and degenerate horizons in two-dimensional gravity  

Science Journals Connector (OSTI)

We analyze an integrable model of two-dimensional gravity which can be reduced to a pair of Liouville fields in the conformal gauge. Its general solution represents a pair of “mirror” black holes with the same temperature. The ground state is a degenerate constant dilaton configuration similar to the Nariai solution of the Schwarzschild–de Sitter case. The existence of ?=const solutions and their relation to the solution given by the 2D Birkhoff theorem is then investigated in a more general context. We also point out some interesting features of the semiclassical theory of our model and the similarity with the behavior of AdS2 black holes.

J. Cruz; A. Fabbri; D. J. Navarro; J. Navarro-Salas

1999-12-20T23:59:59.000Z

68

Integrable models and degenerate horizons in two-dimensional gravity  

E-Print Network [OSTI]

We analyse an integrable model of two-dimensional gravity which can be reduced to a pair of Liouville fields in conformal gauge. Its general solution represents a pair of ``mirror'' black holes with the same temperature. The ground state is a degenerate constant dilaton configuration similar to the Nariai solution of the Schwarzschild-de Sitter case. The existence of $\\phi=const.$ solutions and their relation with the solution given by the 2D Birkhoff's theorem is then investigated in a more general context. We also point out some interesting features of the semiclassical theory of our model and the similarity with the behaviour of AdS$_2$ black holes.

J. Cruz; A. Fabbri; D. J. Navarro; J. Navarro-Salas

1999-06-24T23:59:59.000Z

69

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

70

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

71

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...

72

Cooling by adiabatic magnetization of a degenerate semiconductor in the ultra-quantum region  

Science Journals Connector (OSTI)

The possibility of using the adiabatic magnetization of a degenerate semiconductor in the ultra-quantum region for producing temperatures below 100 mK is examined.

J. -P. Jay-Gerin; A. Briggs

1981-11-01T23:59:59.000Z

73

Effect of Doppler broadening on quantitative concentration measurements with degenerate four-wave mixing spectroscopy  

Science Journals Connector (OSTI)

The effect of Doppler broadening on degenerate four-wave mixing (DFWM) signal intensities in the regime of high pump and probe laser intensities is investigated theoretically. DFWM...

Reichardt, Thomas A; Lucht, Robert P

1996-01-01T23:59:59.000Z

74

The triple degenerate star WD1704+481  

E-Print Network [OSTI]

WD1704+481 is a visual binary in which both components are white dwarfs. We present spectra of the H-alpha line of both stars which show that one component (WD1704+481.2 = Sanduleak B = GR 577) is a close binary with two white dwarf components. Thus, WD1704+481 is the first known triple degenerate star. From radial velocity measurements of the close binary we find an orbital period of 0.1448d, a mass ratio, q=Mbright/Mfaint of q=0.70+-0.03 and a difference in the gravitational redshifts of 11.5+-2.3km/s. The masses of the close pair of white dwarfs predicted by the mass ratio and gravitational redshift difference combined with theoretical cooling curves are 0.39+-0.05 solar mass and 0.56+-0.07 solar masses. WD1704+481 is therefore also likely to be the first example of a double degenerate in which the less massive white dwarf is composed of helium and the other white dwarf is composed of carbon and oxygen.

P. F. L. Maxted; T. R. Marsh; C. K. J. Moran; Z. Han

2000-01-12T23:59:59.000Z

75

ORIGINAL ARTICLE The Impact of a Video Intervention on the Use  

E-Print Network [OSTI]

treatment for the dry type of macular degeneration, thus the vast majority of people with this condition

Peli, Eli

76

Gene Found for the Fading Eyesight of Old Age  

Science Journals Connector (OSTI)

...macular degeneration, the so-called dry type, which accounts for 80% of cases...Twenty-five of the 134 patients with dry-type macular degeneration had mutations...macular degeneration, the so-called dry type, which accounts for 80% of cases...

Elizabeth Pennisi

1997-09-19T23:59:59.000Z

77

Stopping of relativistic electrons in a partially degenerate electron fluid  

Science Journals Connector (OSTI)

The stopping mechanisms of relativistic electron beams in superdense and partially degenerate electron fluid targets are investigated in the framework of the fast ignitor concept for inertial confinement fusion. In order to comply with specific demands in this area, we focus attention on the target partial degeneracy parameter ?=Te?Tf, in terms of the thermal to Fermi temperature ratio. The target electron fluid is thus modeled very accurately with a random phase approximation dielectric function. The stopping results are shown to be very weakly ? dependent. However, a quantum target description is needed to recover their correct increasing trend with increasing projectile energy. The ranges and effective penetration depths in precompressed thermonuclear fuels are shown to be nearly a factor of 2 shorter than earlier classical estimates in the same conditions. The overall conclusions pertaining to the feasibility of fast ignition thus remain unchanged.

K. V. Starikov and C. Deutsch

2005-02-22T23:59:59.000Z

78

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

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

Search for double degenerate progenitors of supernovae type Ia with SPY  

E-Print Network [OSTI]

We report on a large survey for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (ESO SN Ia Progenitor surveY - SPY).

R. Napiwotzki; H. Drechsel; U. Heber; C. Karl; E. -M. Pauli; N. Christlieb; H. -J. Hagen; D. Reimers; D. Koester; S. Moehler; D. Homeier; B. Leibundgut; A. Renzini; T. R. Marsh; G. Nelemans; L. Yungelson

2002-10-07T23:59:59.000Z

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 molecular genetics and neuropathology of frontotemporal lobar degeneration: recent developments  

Science Journals Connector (OSTI)

The past year has seen a number of significant advances in our understanding of the neuropathological and molecular genetic basis of frontotemporal lobar degeneration (FTLD). Whereas, in the past, most attenti...

Ian R. A. Mackenzie; Rosa Rademakers

2007-11-01T23:59:59.000Z

82

LED Based Dual Wavelength Heterochromatic Flicker Method for Separate Evaluation of Lutein and Zeaxanthin in Retina  

Science Journals Connector (OSTI)

The decrease of density and consequentially optical density of macular pigment serves as a diagnostic mean for a number of ophthalmological pathologies, particularly as a risk factor for age related macular degen...

M. Ozolinsh; P. Paulins

2013-01-01T23:59:59.000Z

83

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

84

E-Print Network 3.0 - atypical hemolytic uremic Sample Search...  

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

AMD, age-related macular... regulatory protein, predispose to ... Source: Ponder, Katherine P. - Departments of Medicine & Biochemistry and Molecular Biophysics, Washington...

85

Effective cubic nonlinearity and cnoidal waves in the degenerate parametric frequency conversion  

SciTech Connect (OSTI)

It is shown that under the degenerate conditions (SHG and type-I degenerate parametric generation), the increase in the order of a system of truncated wave equations reduces the initial problem to the solution of two independent nonlinear Schroedinger equations, which allows one to write down the analytic solutions of the corresponding problems by using the standard methods for constructing the searched-for solutions in the form of cnoidal waves. It is established that in realising of cascade processes (quasi-synchronism), one of which is degenerate, this approach based on the introduction of the concept of the effective cascade cubic nonlinearity is not very convenient because the latter in the general case is no longer the Kerr one.

Petnikova, V M; Shuvalov, Vladimir V [International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)

2010-05-26T23:59:59.000Z

86

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

87

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

88

Search for double degenerate progenitors of supernovae type Ia with SPY  

E-Print Network [OSTI]

We report on a large survey for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (SN Ia Progenitor surveY - SPY). About 560 white dwarfs were checked for radial velocity variations until now. Ninety new DDs have been discovered, including short period systems with masses close to the Chandrasekhar mass.

R. Napiwotzki; N. Christlieb; H. Drechsel; H. -J. Hagen; U. Heber; D. Homeier; C. Karl; D. Koester; B. Leibundgut; T. R. Marsh; S. Moehler; G. Nelemans; E. -M. Pauli; D. Reimers; A. Renzini; L. Yungelson

2002-10-29T23:59:59.000Z

89

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

90

Accelerator-based neutron source using a cold deuterium target with degenerate electrons  

SciTech Connect (OSTI)

A neutron generator is considered in which a beam of tritons is incident on a hypothetical cold deuterium target with degenerate electrons. The energy efficiency of neutron generation is found to increase substantially with electron density. Recent reports of potential targets are discussed.

Phillips, R. E.; Ordonez, C. A. [Department of Physics, University of North Texas, Denton, Texas 76203 (United States)] [Department of Physics, University of North Texas, Denton, Texas 76203 (United States)

2013-07-15T23:59:59.000Z

91

Theory of degenerate three-wave mixing using circuit QED in solid-state circuits  

SciTech Connect (OSTI)

We study the theory of degenerate three-wave mixing and the generation of squeezed microwaves using circuit quantum electrodynamics in solid state circuits. The Hamiltonian for degenerate three-wave mixing, which seemed to be given phenomenologically in quantum optics, is derived by quantum mechanical calculations. The nonlinear medium needed in three-wave mixing is composed of a series of superconducting charge qubits which are located inside two superconducting transmission-line resonators. Here, the multiqubit ensemble is present to enhance the effective coupling constant between the two modes in the transmission-line resonators. In the squeezing process, the qubits are kept in their ground states so that their decoherence does not corrupt the squeezing. The main obstacle preventing a large squeezing efficiency is the decay rate of the transmission-line resonator.

Cao, Ye [Key Laboratory of Atomic and Molecular Nanosciences and Department of Physics, Tsinghua University, Beijing 100084 (China); Huo, Wen Yi [Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China); Ai, Qing [Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190 (China); Long, Gui Lu [Key Laboratory of Atomic and Molecular Nanosciences and Department of Physics, Tsinghua University, Beijing 100084 (China); Tsinghua National Laboratory For Information Science and Technology, Beijing 100084 (China)

2011-11-15T23:59:59.000Z

92

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

93

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

94

Exposure to 1-bromopropane causes degeneration of noradrenergic axons in the rat brain  

Science Journals Connector (OSTI)

1-Bromopropane (1-BP) has been used as an alternative to ozone-depleting solvents. Previous studies showed that 1-BP is neurotoxic in animals and humans. In humans, exposure to 1-BP caused various neurological and neurobehavioral symptoms or signs including depressive or irritated mood. However, the neurobiological changes underlying the depressive symptoms induced by 1-BP remain to be determined. The depressive symptoms are thought to be associated with degeneration of axons containing noradrenaline and serotonin. Based on this hypothesis, the present study examined the effects of repeated exposure to 1-BP on serotonergic and noradrenergic axons. Exposure to 1-BP induced dose-dependent decreases in the density of noradrenergic axons in the rat prefrontal cortex, but no apparent change in the density of serotonergic axons. The results suggest that depressive symptoms in workers exposed to 1-BP are due, at least in part, to the degeneration of noradrenergic axons in the brain.

Sahabudeen Sheik Mohideen; Gaku Ichihara; Sahoko Ichihara; Shoji Nakamura

2011-01-01T23:59:59.000Z

95

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

96

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

97

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

98

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

99

Information-Entropic Measure of Energy-Degenerate Kinks in Two-Field Models  

E-Print Network [OSTI]

We investigate the existence and properties of kink-like solitons in a class of models with two interacting scalar fields. In particular, we focus on models that display both double and single-kink solutions, treatable analytically using the Bogomol'nyi--Prasad--Sommerfield bound (BPS). Such models are of interest in applications that include Skyrmions and various superstring-motivated theories. Exploring a region of parameter space where the energy for very different spatially-bound configurations is degenerate, we show that a newly-proposed momentum-space entropic measure called Configurational Entropy (CE) can distinguish between such energy-degenerate spatial profiles. This information-theoretic measure of spatial complexity provides a complementary perspective to situations where strictly energy-based arguments are inconclusive.

R. A. C. Correa; A. de Souza Dutra; M. Gleiser

2014-08-29T23:59:59.000Z

100

A wireless sensor network deployment to detect the degeneration of cement used in construction  

Science Journals Connector (OSTI)

During last few years, the high environmental humidity and salinity in areas close to the sea have caused degeneration of the construction materials. Due to this, several building have collapsed. Several studies demonstrated that it is very difficult to predict these cases. For this reason, we propose a non-invasive technique which takes into account the appropriate placement of the wireless sensors to detect the degeneration of the cement used in construction. Our proposal is based on a wireless sensor network (WSN) which is able to sense the temperature, humidity, micro-vibrations and structural movements. We show the sensor deployment and its appropriate location to take the most suitable measurements and ensure the reliability of the data. We show the energy consumption of each node and the web interface used to show the data. From the structural movements, our WSN can know whether a building is in danger of collapse or not.

S. Sendra; A.T. Lloret; J. Lloret; J.J.P.C. Rodrigues

2014-01-01T23:59:59.000Z

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101

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

102

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

103

Constraining the double-degenerate scenario for Type Ia supernovae from merger ejected matter  

E-Print Network [OSTI]

We follow the mass blown during the WD-WD merger process in the Double-Degenerate (DD) scenario for type Ia supernovae (SN Ia), and find that the interaction of the SN ejecta with this wind affects the early (thermal energy and then to additional radiation. The radiation could be interpreted as an explosion originating from a progenitor having a radius of one solar radius or more, contradicting observations of SN 2011fe.

Levanon, Naveh; García-Berro, Enrique

2014-01-01T23:59:59.000Z

104

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

105

Exchange-Degenerate ?-Trajectory Interpretation of K+p Backward Elastic Scattering Data  

Science Journals Connector (OSTI)

A baryon Regge exchange model for K+p backward elastic scattering is constructed in accordance with the requirements of duality and the absence of Y=+2 baryons. The dominant exchange-degenerate amplitude is associated with the ?? (1115, 12+) and ?? (1520, 32-) particles. Recent data on d?du (K+p) from 2 to 7 GeV/c are successfully reproduced.

V. Barger

1969-03-25T23:59:59.000Z

106

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

107

Kapitsa resistence in degenerate quantum gases with Bogolyubov energy excitations in the presence of Bose - Einstein condensate  

E-Print Network [OSTI]

The linearized kinetic equation modelling behaviour of the degenerate quantum bose gas with the frequency of collisions depending on momentum of elementary excitations is constructed. The general case of dependence of the elementary excitations energy on momentum according to Bogolyubov formula is considered. The analytical solution of the half-space boundary problem on temperature jump on border of degenerate bose gas in the presence of a Bose - Einstein condensate is received. Expression for Kapitsa resistance is received.

Latyshev, Anatoly V

2010-01-01T23:59:59.000Z

108

Microsoft PowerPoint - Vargis_2014_CNMS Staff Science Highlight...  

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

related macular degeneration. Reference "The effect of retinal pigment epithelial cell patch size on growth factor expression" Elizabeth Vargis a , Cristen B. Peterson c ,...

109

Magnetism of a relativistic degenerate electron gas in a strong magnetic field  

SciTech Connect (OSTI)

The magnetization and magnetic susceptibility of a degenerate electron gas in a strong magnetic field in which electrons are located on the ground Landau level and the electron gas has the properties of a nonlinear paramagnet have been calculated. The paradoxical properties of the electron gas under these conditions-a decrease in the magnetization with the field and an increase in the magnetization with the temperature-have been revealed. It has been shown that matter under the corresponding conditions of neutron stars is a paramagnet with a magnetic susceptibility of {chi} {approx} 0.001.

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

2012-09-15T23:59:59.000Z

110

Measurement of the Resistivity in a Partially Degenerate, Strongly Coupled Plasma  

Science Journals Connector (OSTI)

Plasmas with densities of 6×1022ecm3 and temperatures of 10 eV have been created by means of capillary discharge. These parameters indicate that the plasmas are partially degenerate and strongly coupled. By measuring the size of the plasma, the current, and the voltage, one can infer the resistivity of the plasma and compare it with calculated values from various transport theories. The results of this experiment show that theories that do not accurately model the complete electron-ion interaction within this regime can be inaccurate by as much as a factor of 200.

R. L. Shepherd, D. R. Kania, and L. A. Jones

1988-09-12T23:59:59.000Z

111

A detached double degenerate with a 1.4 hr orbital period  

E-Print Network [OSTI]

We have discovered that the detached double degenerate binary WD 0957-666 has an orbital period of 1.46 hours, rather than the 1.15 day orbital period reported earlier. This is the shortest period example of such a system yet discovered. We obtain a unique period, which fits both our and earlier data. At this period the emission of gravitational radiation will cause the binary to merge within approximately 2.0 x 10*8 years. This system represents a population of short orbital period binaries which will merge within a Hubble time, and so could account for type Ia supernovae, although due to the low mass of both stars (0.3 to 0.4 solar masses), it is unlikely to become a supernova itself. We have detected the companion star and have measured a mass ratio of q = 1.15. This is the third double degenerate for which q has been measured and all three have q close to 1, which is in conflict with the predicted mass ratio distribution which peaks at 0.7. This system is viewed close to edge on, and we estimate that the probability of this system undergoing eclipses is 15 %.

C. Moran; T. R. Marsh; A. Bragaglia

1997-04-24T23:59:59.000Z

112

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

113

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...

Truc, Francoise

2009-01-01T23:59:59.000Z

114

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

115

Stimulated Scattering of Indirect Excitons in Coupled Quantum Wells: Signature of a Degenerate Bose-Gas of Excitons  

Science Journals Connector (OSTI)

We observe and analyze strongly nonlinear photoluminescence kinetics of indirect excitons in GaAs/AlGaAs coupled quantum wells at low bath temperatures, ?50 mK. The long recombination lifetime of indirect excitons promotes accumulation of these Bose particles in the lowest energy states and allows the photoexcited excitons to cool down to temperatures where the dilute 2D gas of indirect excitons becomes statistically degenerate. Our main result—a strong enhancement of the exciton scattering rate to the low-energy states with increasing concentration of the indirect excitons—reveals bosonic stimulation of exciton scattering, which is a signature of a degenerate Bose-gas of excitons.

L. V. Butov, A. L. Ivanov, A. Imamoglu, P. B. Littlewood, A. A. Shashkin, V. T. Dolgopolov, K. L. Campman, and A. C. Gossard

2001-06-11T23:59:59.000Z

116

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

117

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

118

Classical and Quantum Implications of the Causality Structure of Two-Dimensional Spacetimes with Degenerate Metrics  

E-Print Network [OSTI]

The causality structure of two-dimensional manifolds with degenerate metrics is analysed in terms of global solutions of the massless wave equation. Certain novel features emerge. Despite the absence of a traditional Lorentzian Cauchy surface on manifolds with a Euclidean domain it is possible to uniquely determine a global solution (if it exists), satisfying well defined matching conditions at the degeneracy curve, from Cauchy data on certain spacelike curves in the Lorentzian region. In general, however, no global solution satisfying such matching conditions will be consistent with this data. Attention is drawn to a number of obstructions that arise prohibiting the construction of a bounded operator connecting asymptotic single particle states. The implications of these results for the existence of a unitary quantum field theory are discussed.

Jonathan Gratus; Robin W Tucker

1996-06-21T23:59:59.000Z

119

The Construction of Spinor Fields on Manifolds with Smooth Degenerate Metrics  

E-Print Network [OSTI]

We examine some of the subtleties inherent in formulating a theory of spinors on a manifold with a smooth degenerate metric. We concentrate on the case where the metric is singular on a hypersurface that partitions the manifold into Lorentzian and Euclidean domains. We introduce the notion of a complex spinor fibration to make precise the meaning of continuity of a spinor field and give an expression for the components of a local spinor connection that is valid in the absence of a frame of local orthonormal vectors. These considerations enable one to construct a Dirac equation for the discussion of the behavior of spinors in the vicinity of the metric degeneracy. We conclude that the theory contains more freedom than the spacetime Dirac theory and we discuss some of the implications of this for the continuity of conserved currents.

J Schray; T Dray; C A Manogue; R W Tucker; C Wang

1996-05-17T23:59:59.000Z

120

Enhancement of phase-conjugate reflectivity using Zeeman coherence in highly degenerate molecular systems  

SciTech Connect (OSTI)

A comprehensive theoretical analysis is developed for the vectorial phase conjugation using resonant four-wave mixing (FWM) in a highly degenerate rotational vibrational molecular system. The dynamic Stark shifts, saturation, and Doppler broadening are included for a realistic analysis. It is shown that the electromagnetically induced multilevel coherence controls the nonlinear wave mixing yielding interesting results for the phase conjugate (PC) reflectivity. It turns out that the efficiency of the PC reflectivity is decided by the relative phase of the Zeeman coherence and the population grating. When these two contributions are aligned in phase by a small detuning of the pump frequency, a large PC reflectivity (approx20%) is obtained with moderate pump intensity (approx500 mW/cm{sup 2}).

Mukherjee, Nandini [Department of Physics and Astronomy, University of California, Los Angeles, California 90095 (United States)

2010-01-15T23:59:59.000Z

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.


121

Degenerate vacua from unification of second law of thermodynamics with other laws  

E-Print Network [OSTI]

Using our recent attempt to formulate second law of thermodynamics in a general way into a language with a probability density function, we derive degenerate vacua. Under the assumption that many coupling constants are effectively ``dynamical'' in the sense that they are or can be counted as initial state conditions, we argue in our model behind the second law that these coupling constants will adjust to make several vacua all having their separate effective cosmological constants or, what is the same, energy densities, being almost the \\underline{same} value, essentially zero. Such degeneracy of vacuum energy densities is what one of us works on a lot under the name "The multiple point principle" (MPP).

Holger B. Nielsen; Masao Ninomiya

2007-01-03T23:59:59.000Z

122

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

123

Production of bosonic molecules in the nonequilibrium dynamics of a degenerate Fermi gas across a Feshbach resonance  

E-Print Network [OSTI]

In this thesis I present a nonequilibrium quantum field theory that describes the production of molecular dimers from a two-component quantum-degenerate atomic Fermi gas, via a linear downward sweep of a magnetic field across an s-wave Feshbach...

Dobrescu, Bogdan E.

2009-06-02T23:59:59.000Z

124

Age-Related Clonal Hematopoiesis Associated with Adverse Outcomes  

Science Journals Connector (OSTI)

...mutations in several types of hematologic cancers.– However, the frequency of these somatic mutations in the general population is unknown. We tested the hypothesis that somatically acquired single-nucleotide variants (SNVs) and small indels might be detectable in the blood of older persons who are... Cancer is thought to arise through the stepwise acquisition of genetic or epigenetic changes that transform a normal cell.1 Hence, the existence of a premalignant state bearing only the initiating lesions may be detectable in some persons who have no ...

2014-11-26T23:59:59.000Z

125

New Intraocular Lens Technology  

Science Journals Connector (OSTI)

Purpose To review the current status of phakic intraocular lenses (IOLs), intraocular treatment of presbyopia, and \\{IOLs\\} that filter some blue light. Design Review of current information on the subject from numerous sources. Methods Medline search and Internet search engines on the topics of phakic IOLs, presbyopia or multifocal IOLs, and blue light and macular degeneration. Results An iris fixated phakic \\{IOLs\\} is now approved in the United States (US). There are concerns for corneal endothelial stability and late dislocation. Other approaches include anterior chamber fixation with concerns of corneal endothelial stability and pupil elongation, and posterior chamber fixation with concerns of cataract formation, IOL dislocation, and pigment dispersion. Intraocular treatment of presbyopia includes monovision, multifocal, and accommodative IOLs. Which approach is superior today is still not clear. There are \\{IOLs\\} designed to block some blue light to potentially lessen the risk of age-related macular degeneration (ARMD). While there is presumptive evidence of this, no definitive study shows such a correlation. Color perception issues are unlikely to be a problem. While decreased scotopic vision has been proposed, there is no study that proves this is an issue of clinical significance. Conclusions The IOL field is dynamic with many new choices. Phakic \\{IOLs\\} and treatment of presbyopia will be an increasingly important part of ophthalmology; however, there are important unresolved issues. With better evidence that blue light is an important variable in ARMD, such an approach could rapidly become the standard.

Randall J. Olson; Liliana Werner; Nick Mamalis; Robert Cionni

2005-01-01T23:59:59.000Z

126

The Discovery of a Short Period Double-Degenerate Binary Star  

E-Print Network [OSTI]

We have found that the white dwarf PG 1101+364 is a double-lined white dwarf/white dwarf binary with an orbital period of 3.47 hours. PG 1101+364 is the shortest period detached double-degenerate yet found and gravitational radiation will cause it to merge in 2.5 X 10**9 years. PG 1101+364 has a mass ratio of 0.87 +/- 0.03. From the relative strengths of the narrow core of Halpha, the lighter and therefore larger star appears to contribute more of the light by an amount that indicates almost equal temperatures for the two stars. We chose to observe PG 1101+364 on the basis of its low spectroscopic mass (0.31 Msun), and the discovery of its binary nature confirms the belief that binary evolution is required to produce such low mass white dwarfs. The radial velocity semi-amplitudes (69.7 +/- 1.7 km/s and 80.3 +/- 1.6 km/s) and the spectroscopic mass show that we see the orbit of PG 1101+364 at a low inclination of ~ 25 deg.

T. R. Marsh

1995-04-25T23:59:59.000Z

127

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

128

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

129

Combination of memantine and vitamin D prevents axon degeneration induced by amyloid-beta and glutamate  

Science Journals Connector (OSTI)

Abstract The currently available drugs for treatment of Alzheimer's disease are symptomatic and only temporarily slow down the natural history of the disease process. Recently, its has been proposed that the combination of memantine with vitamin D, a neurosteroid hormone, may prevent amyloid-beta and glutamate neurotoxicity. Here, our purpose was to examine the potential protective effects of memantine and vitamin D against amyloid-beta peptide and glutamate toxicity in cortical neuronal cultures. We provide the first evidence that cortical axons degenerate less after exposure to amyloid-beta peptide or glutamate in microfluidic neuronal cultures enriched with memantine plus vitamin D compared to control medium and cultures enriched with only memantine or only vitamin D. The reported synergistic neuroprotective effect of memantine plus vitamin D -the combination originating an effect stronger than the sum- corroborate previous clinical finding that Alzheimer's disease patients using this drug combination have improved cognition. This finding reinforces the pharmacological potential of a new drug combining memantine plus vitamin D for the treatment or the prevention of Alzheimer's disease.

Cédric Annweiler; Bernard Brugg; Jean-Michel Peyrin; Robert Bartha; Olivier Beauchet

2014-01-01T23:59:59.000Z

130

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

131

Collective ferromagnetism in two-component Fermi-degenerate gas trapped in a finite potential  

Science Journals Connector (OSTI)

Spin asymmetry of ground states is studied in trapped spin-degenerate (two-component) gases of fermionic atoms with repulsive interaction between different components; and, for a large particle number, the asymmetric (collective ferromagnetic) states are shown to be stable because it can be energetically favorable to increase the Fermi energy of one component rather than increase the interaction energy between up-down components. We formulate the Thomas-Fermi equations and give algebraic methods to solve them. From the Thomas-Fermi solutions, we find three kinds of ground states in the finite system: (1) paramagnetic (spin-symmetric), (2) ferromagnetic (equilibrium), and (3) ferromagnetic (nonequilibrium) states. We present the density profiles and the critical atom numbers for these states obtained analytically, and, in ferromagnetic states, the spin asymmetries are shown to occur in the central region of the trapped gas, and increase with increasing particle number. Based on the obtained results, we discuss the experimental conditions and current difficulties in realizing the ferromagnetic states of the trapped atom gas, which should be overcome.

T. Sogo and H. Yabu

2002-10-21T23:59:59.000Z

132

Influence of the electron-exchange and quantum shielding on the bremsstrahlung spectrum in degenerate quantum plasmas  

SciTech Connect (OSTI)

The influence of the electron-exchange and quantum shielding on the bremsstrahlung spectrum is investigated in degenerate quantum plasmas. The impact-parameter analysis with the Shukla-Eliasson potential is applied to obtain the electron-ion bremsstrahlung radiation cross section as a function of the impact parameter, photon energy, projectile energy, electron-exchange parameter, Fermi energy, and plasmon energy. The result shows that the electron-exchange effect strongly enhances the bremsstrahlung radiation spectrum in degenerate quantum plasmas. It is also shown that the influence of the electron-exchange broadens the photon emission range in the electron-ion bremsstrahlung process. It is found that the electron-exchange effect focuses the bremsstrahlung photon energy in the soft photon domain. In addition, it is found that the bremsstrahlung radiation cross section increases with an increase of the Fermi energy and, however, decreases with increasing plasmon energy.

Jung, Young-Dae [Department of Electrical and Computer Engineering, MC 0407, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0407, USA and Department of Applied Physics, Hanyang University, Ansan, Kyunggi-Do 426-791 (Korea, Republic of)] [Department of Electrical and Computer Engineering, MC 0407, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0407, USA and Department of Applied Physics, Hanyang University, Ansan, Kyunggi-Do 426-791 (Korea, Republic of)

2013-10-15T23:59:59.000Z

133

Accuracy on eigenvalues for a Schrodinger operator with a degenerate potential in the semi-classical limit  

E-Print Network [OSTI]

We consider a semi-classical Schrodinger operator with a degenerate potential V(x,y) =f(x) g(y) . g is assumed to be a homogeneous positive function of m variables and f is a strictly positive function of n variables, with a strict minimum. We give sharp asymptotic behaviour of low eigenvalues bounded by some power of the parameter h, by improving Born-Oppenheimer approximation.

Abderemane Morame; Francoise Truc

2006-06-09T23:59:59.000Z

134

J. Phys. D: Appl. Phys. 30 (1997) 33463352. Printed in the UK PII: S0022-3727(97)84206-4 Degenerate four-wave mixing in  

E-Print Network [OSTI]

Abstract. The non-intrusive degenerate four-wave mixing (DFWM) method was used to study the local thermal equilibrium atmospheric-pressure argon arc plasma. The laser wavelength was in resonance with the 4s[3/2]0 �4p-3727(97)84206-4 Degenerate four-wave mixing in equilibrium argon arc plasma K Musiol, K Dzierz�ega, E Pawelec, B Pokrzywka

135

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

2014-08-28T23:59:59.000Z

136

J. Phys. D: Appl. Phys. 30 (1997) 33463352. Printed in the UK PII: S0022-3727(97)84206-4 Degenerate four-wave mixing in  

E-Print Network [OSTI]

Abstract. The non-intrusive degenerate four-wave mixing (DFWM) method was used to study the local thermal equilibrium atmospheric-pressure argon arc plasma. The laser wavelength was in resonance with the 4s[3/2]0 �4p tool in laboratory plasma investigations. A simple experimental set-up and non-intrusive measurement

137

Proteomic Analysis Identifies Dysfunction in Cellular Transport, Energy, and Protein Metabolism in Different Brain Regions of Atypical Frontotemporal Lobar Degeneration  

Science Journals Connector (OSTI)

Urwin, H.; Josephs, K. A.; Rohrer, J. D.; Mackenzie, I. R.; Neumann, M.; Authier, A.; Seelaar, H.; Van Swieten, J. C.; Brown, J. M.; Johannsen, P.; Nielsen, J. E.; Holm, I. E.; Dickson, D. W.; Rademakers, R.; Graff-Radford, N. R.; Parisi, J. E.; Petersen, R. C.; Hatanpaa, K. J.; White, C. L., 3rd; Weiner, M. F.; Geser, F.; Van Deerlin, V. M.; Trojanowski, J. Q.; Miller, B. L.; Seeley, W. W.; van der Zee, J.; Kumar-Singh, S.; Engelborghs, S.; De Deyn, P. P.; Van Broeckhoven, C.; Bigio, E. H.; Deng, H. X.; Halliday, G. M.; Kril, J. J.; Munoz, D. G.; Mann, D. M.; Pickering-Brown, S. M.; Doodeman, V.; Adamson, G.; Ghazi-Noori, S.; Fisher, E. M.; Holton, J. L.; Revesz, T.; Rossor, M. N.; Collinge, J.; Mead, S.; Isaacs, A. M.FUS pathology defines the majority of tau- and TDP-43-negative frontotemporal lobar degeneration Acta Neuropathol. ... Urwin Hazel; Josephs Keith A; Rohrer Jonathan D; Mackenzie Ian R; Neumann Manuela; Authier Astrid; Seelaar Harro; Van Swieten John C; Brown Jeremy M; Johannsen Peter; Nielsen Jorgen E; Holm Ida E; Dickson Dennis W; Rademakers Rosa; Graff-Radford Neill R; Parisi Joseph E; Petersen Ronald C; Hatanpaa Kimmo J; White Charles L 3rd; Weiner Myron F; Geser Felix; Van Deerlin Vivianna M; Trojanowski John Q; Miller Bruce L; Seeley William W; van der Zee Julie; Kumar-Singh Samir; Engelborghs Sebastiaan; De Deyn Peter P; Van Broeckhoven Christine; Bigio Eileen H; Deng Han-Xiang; Halliday Glenda M; Kril Jillian J; Munoz David G; Mann David M; Pickering-Brown Stuart M; Doodeman Valerie; Adamson Gary; Ghazi-Noori Shabnam; Fisher Elizabeth M C; Holton Janice L; Revesz Tamas; Rossor Martin N; Collinge John; Mead Simon; Isaacs Adrian M ... Kocerha, J.; Kouri, N.; Baker, M.; Finch, N.; Dejesus-Hernandez, M.; Gonzalez, J.; Chidamparam, K.; Josephs, K. A.; Boeve, B. F.; Graff-Radford, N. R.; Crook, J.; Dickson, D. W.; Rademakers, R.Altered microRNA expression in frontotemporal lobar degeneration with TDP-43 pathology caused by progranulin mutations BMC Genomics 2011, 12 ( 1) 527 ...

Daniel Martins-de-Souza; Paul C. Guest; David M. Mann; Sigrun Roeber; Hassan Rahmoune; Corinna Bauder; Hans Kretzschmar; Benedikt Volk; Atik Baborie; Sabine Bahn

2012-02-24T23:59:59.000Z

138

Phase Diagram and Structural Diversity of a Family of Truncated Cubes: Degenerate Close-Packed Structures and Vacancy-Rich States  

Science Journals Connector (OSTI)

Using Monte Carlo simulations and free-energy calculations, we determine the phase diagram of a family of truncated hard cubes, where the shape evolves smoothly from a cube via a cuboctahedron to an octahedron. A remarkable diversity in crystal phases and close-packed structures is found, including a fully degenerate crystal structure, several plastic crystals, as well as vacancy-stabilized crystal phases, all depending sensitively on the precise particle shape. Our results illustrate the intricate relation between phase behavior and building-block shape, and can guide future experimental studies on polyhedral-shaped nanoparticles.

Anjan P. Gantapara; Joost de Graaf; René van Roij; Marjolein Dijkstra

2013-07-01T23:59:59.000Z

139

The effect of hyaluronan-based delivery of stromal cell-derived factor-1 on the recruitment of \\{MSCs\\} in degenerating intervertebral discs  

Science Journals Connector (OSTI)

Abstract Intervertebral disc (IVD) degeneration is the leading cause of low back pain and disability in the active population. Transplantation of mesenchymal stem cells (MSCs) in a hydrogel carrier can induce regenerative effects in degenerated IVDs. Moreover, it was found that degenerative discs release chemoattractants effective in MSC recruitment. Based on these findings, we hypothesized that an injectable hydrogel that can enhance the number of migrated \\{MSCs\\} in the IVD and provide a suitable matrix for their survival and differentiation would be ideal. The purpose of this study was to evaluate the potential of a thermoreversible hyaluronan-poly(N-isopropylacrylamide) (HAP) hydrogel as chemoattractant delivery system to recruit human \\{MSCs\\} in degenerative IVDs. The results demonstrate that HAP hydrogels containing stromal cell derived factor-1 (SDF-1) significantly increased the number of \\{MSCs\\} migrating into nucleotomized discs compared with discs treated with only HAP or SDF-1 in solution. HAP hydrogels releasing SDF-1 enhanced both the number of recruited cells and their migration distance in the IVD tissue. Furthermore, this phenomenon was dependent on MSC donor age. In conclusion, HAP SDF-1 is effective for the recruitment of stem cells in the IVD, thus opening new possibilities for the development of regenerative therapies based on endogenous cell migration.

Catarina Leite Pereira; Raquel M. Gonçalves; Marianna Peroglio; Girish Pattappa; Matteo D'Este; David Eglin; Mário A. Barbosa; Mauro Alini; Sibylle Grad

2014-01-01T23:59:59.000Z

140

E-Print Network 3.0 - age-related drug design Sample Search Results  

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

as improving symptom control... , London NW1 2BE. HIGHLIGHT Zebrafish as a drug screening platform ENABLING TECHNOLOGIES, PRODUCTS... of zebrafish to facilitate drug discovery....

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

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...

142

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

143

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...

144

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...

145

E-Print Network 3.0 - age-related cone abnormalities Sample Search...  

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

Summary: -27). RESULTS Foveal cone abnormalities in the early decades of life of human LCA due to RPE65 mutations High... reduced foveal ONL as well as abnormally thinned IS and...

146

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...

147

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...

148

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:...

149

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

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

perfusion Helga Ross1 Summary: EIT measurement of heart and lung perfusion Helga Ross1 , Benjamin J.W. Chow2 , and Andy Adler1 1... . Introduction Electrical Impedance Tomography...

150

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

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

mulatingtheThermaland ElectricalProductionofSmall- ScaleSolid-Oxide... University, Stirling engine cogeneration for housing MikeCarl, secondyearM.A.Sc.at UniversityofVictoria,...

151

E-Print Network 3.0 - age-related myelin dynamics Sample Search...  

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

many... SFG. Fu et al. demonstrated multimodal NLO imaging of ex vivo spinal tissues by CARS imaging of myelin... has been applied to various systems including lipid bilayers...

152

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

153

GABAergic systems in a model of age-related cognitive impairment  

E-Print Network [OSTI]

cohort of young and aged rats was characterized in an odor discrimination task. Similar to aged rat water maze performance, some aged rats performed odor learning discrimination problems on par with the young cohort (i.e. aged-unimpaired) and some aged...

LaSarge, Candi Lynn

2012-07-16T23:59:59.000Z

154

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

155

Age-related comparison of superoxide production by canine neutrophilic polymorphonuclear leukocytes  

E-Print Network [OSTI]

. Academic Press, New York. 31. Hadley, E. C. 1982. Genetic alteration and the pathology of aging, p. 115-136. In R. C. Adelman and G. S. Rath (ed. ), Testing the theories of aging. CRC Press, Boca Raton, Florida. 32. Harmon, D. 1956. Aging: theory based.... Academic Press, New York. 31. Hadley, E. C. 1982. Genetic alteration and the pathology of aging, p. 115-136. In R. C. Adelman and G. S. Rath (ed. ), Testing the theories of aging. CRC Press, Boca Raton, Florida. 32. Harmon, D. 1956. Aging: theory based...

Hanson, Thomas Dale

2012-06-07T23:59:59.000Z

156

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

E-Print Network [OSTI]

-Champaign, IL 61802, USA, 3 Energy Biosciences Institute, University of Illinois, Urbana-Champaign, IL 61802 of Illinois, Urbana-Champaign, IL 61802, USA, 2 Department of Plant Biology, University of Illinois, Urbana, USA and 4 Institute of Genomic Biology, University of Illinois, Urbana-Champaign, IL 61802, USA

DeLucia, Evan H.

157

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...

158

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

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

Queen's University (Kingston) Collection: Environmental Sciences and Ecology 3 MARINE ECOLOGY PROGRESS SERIES Mar Ecol Prog Ser Summary: not been addressed in previous...

159

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...

160

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...

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

Age-Related Resistance in Arabidopsis Is a Developmentally Regulated Defense Response to Pseudomonas syringae  

Science Journals Connector (OSTI)

...561-563. Church, G.M., and Gilbert, W. (1984). Genomic sequencing...Arabidopsis genetics growth & development microbiology Arabidopsis Proteins genetics Gene Expression...Immunity, Innate Mutation Plant Diseases microbiology Plant Proteins genetics Pseudomonas...

Julianne V. Kus; Kasia Zaton; Raani Sarkar; Robin K. Cameron

2002-02-19T23:59:59.000Z

162

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...

163

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...

164

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...

165

E-Print Network 3.0 - attenuates age-related decrements Sample...  

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

in the case of power-time law creep an anomalous attenuation decrease is induced by the first stress decrement... of attenuation during the first decrement in the case ... Source:...

166

Ion-acoustic K-dV and mK-dV solitons in a degenerate electron-ion dense plasma  

SciTech Connect (OSTI)

A theoretical investigation has been made of the nonlinear propagation of ion-acoustic waves associated with a dense plasma system consisting degenerate electron and ion fluids. This fluid model, which is valid for both the non-relativistic and ultra-relativistic limits, has been employed with the reductive perturbation method. The K-dV and modified K-dV (mK-dV) equations have been derived and numerically analyzed. The basic features of solitons have been observed. It has been shown that the plasma system under consideration supports the propagation of solitons (electrostatic solitary structures) obtained from the solutions of K-dV and mK-dV equations. The implications of our results obtained from this investigation in compact astrophysical objects have been briefly discussed.

Nahar, L.; Zobaer, M. S.; Roy, N.; Mamun, A. A. [Department of Physics, Jahangirnagar University, Savar, Dhaka-1342 (Bangladesh)

2013-02-15T23:59:59.000Z

167

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

168

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

169

How the Artificial Retina Works  

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

the Artificial Retina Works the Artificial Retina Works Artificial Retina Diagram Normal vision begins when light enters and moves through the eye to strike specialized photoreceptor (light-receiving) cells in the retina called rods and cones. These cells convert light signals to electric impulses that are sent to the optic nerve and the brain. Retinal diseases like age-related macular degeneration and retinitis pigmentosa destroy vision by annihilating these cells. With the artificial retina device, a miniature camera mounted in eyeglasses captures images and wirelessly sends the information to a microprocessor (worn on a belt) that converts the data to an electronic signal and transmits it to a receiver on the eye. The receiver sends the signals through a tiny, thin cable to the microelectrode array, stimulating it to emit pulses. The artificial retina device thus bypasses defunct photoreceptor cells and transmits electrical signals directly to the retina's remaining viable cells. The pulses travel to the optic nerve and, ultimately, to the brain, which perceives patterns of light and dark spots corresponding to the electrodes stimulated. Patients learn to interpret these visual patterns.

170

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

171

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

172

REPRODUCING THE OBSERVED ABUNDANCES IN RCB AND HdC STARS WITH POST-DOUBLE-DEGENERATE MERGER MODELS-CONSTRAINTS ON MERGER AND POST-MERGER SIMULATIONS AND PHYSICS PROCESSES  

SciTech Connect (OSTI)

The R Coronae Borealis (RCB) stars are hydrogen-deficient, variable stars that are most likely the result of He-CO WD mergers. They display extremely low oxygen isotopic ratios, {sup 16}O/{sup 18}O {approx_equal} 1-10, {sup 12}C/{sup 13}C {>=} 100, and enhancements up to 2.6 dex in F and in s-process elements from Zn to La, compared to solar. These abundances provide stringent constraints on the physical processes during and after the double-degenerate merger. As shown previously, O-isotopic ratios observed in RCB stars cannot result from the dynamic double-degenerate merger phase, and we now investigate the role of the long-term one-dimensional spherical post-merger evolution and nucleosynthesis based on realistic hydrodynamic merger progenitor models. We adopt a model for extra envelope mixing to represent processes driven by rotation originating in the dynamical merger. Comprehensive nucleosynthesis post-processing simulations for these stellar evolution models reproduce, for the first time, the full range of the observed abundances for almost all the elements measured in RCB stars: {sup 16}O/{sup 18}O ratios between 9 and 15, C-isotopic ratios above 100, and {approx}1.4-2.35 dex F enhancements, along with enrichments in s-process elements. The nucleosynthesis processes in our models constrain the length and temperature in the dynamic merger shell-of-fire feature as well as the envelope mixing in the post-merger phase. s-process elements originate either in the shell-of-fire merger feature or during the post-merger evolution, but the contribution from the asymptotic giant branch progenitors is negligible. The post-merger envelope mixing must eventually cease {approx}10{sup 6} yr after the dynamic merger phase before the star enters the RCB phase.

Menon, Athira; Herwig, Falk; Denissenkov, Pavel A. [Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P5C2 (Canada); Clayton, Geoffrey C.; Staff, Jan [Department of Physics and Astronomy, Louisiana State University, 202 Nicholson Hall, Tower Dr., Baton Rouge, LA 70803-4001 (United States); Pignatari, Marco [Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel (Switzerland); Paxton, Bill [Kavli Institute for Theoretical Physics and Department of Physics, Kohn Hall, University of California, Santa Barbara, CA 93106 (United States)

2013-07-20T23:59:59.000Z

173

Degenerate cadmium oxide films for electronic devices  

Science Journals Connector (OSTI)

Highly conducting and transparent cadmium oxide films have been deposited on Corning 7059 glass substrates by ion-beam sputtering and by spray pyrolysis. The electrical and optical properties of CdO films prep...

T. L. Chu; Shirley S. Chu

174

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

175

Phase Diagram of Degenerate Exciton Systems  

Science Journals Connector (OSTI)

...3066 ( 1990 ). 11 L. V. Butov , A. Imamoglu, A. V. Mintsev, K. L. Campman, A. C. Gossard, Phys. Rev. B 59 , 1625...3066 (1990). 11 L. V. Butov, A. Imamoglu, A. V. Mintsev, K. L. Campman, A. C. Gossard, Phys. Rev. B 59, 1625...

C. W. Lai; J. Zoch; A. C. Gossard; D. S. Chemla

2004-01-23T23:59:59.000Z

176

Neurodegenerative diseases: Lessons from genome-wide screens in small model organisms Molecular mechanisms of aging-related neurodegenerative diseases: emerging views  

E-Print Network [OSTI]

) Department of Genetics, University Medical Centre Groningen and University of Groningen, Hanzeplein 1, 9700 RB Groningen, The Netherlands. (2) Groningen Bioinformatics Centre, University of Groningen, Kerklaan

Breitling, Rainer

177

Consistent Regional Heterogeneity of Passive Diastolic Stretch and Systolic Deformation in the Healthy Heart: Age-Related Changes in Left Ventricle Contractility  

Science Journals Connector (OSTI)

Abstract The consistency of the normal spatial distribution of segmental passive stretch (PreS) and systolic strain (SS) within the left ventricle was investigated and a recently proposed echocardiographic estimate of left ventricular (LV) contractility was used to detect contractility changes with age. Hereto, in 54 healthy subjects, segmental PreS and SS were measured on tissue Doppler images of six left ventricle walls. For each subject, a linear regression line was estimated through the segmental PreS and SS values. The slopes and intercepts of this PreS-SS relationship did not differ between age groups, suggesting no changes in LV contractility with age. Moreover, a consistent regional distribution of PreS was observed, with the highest values measured in the septum, resulting in a similar distribution of SS as a direct consequence of the Frank-Starling mechanism.

Ruta Jasaityte; Jan D'hooge; Lieven Herbots; Ana M. Daraban; Frank Rademakers; Piet Claus

2014-01-01T23:59:59.000Z

178

Degeneration Effects in Distributed Systems and Their Behavior as Their Parameters Approach the Point of Degeneration  

Science Journals Connector (OSTI)

For the unidimensional distributed nondegenerate linear system, the conditions for degeneracy and convergence of behavior as its parameters approach the point of degeneracy were established and studied using by way of example the unidimensional system ...

E. M. Solnechnyi

2004-11-01T23:59:59.000Z

179

Generation of degenerate, factorizable, pulsed squeezed light at telecom wavelengths  

SciTech Connect (OSTI)

We characterize a periodically poled KTP crystal that produces an entangled, two-mode, squeezed state with orthogonal polarizations, nearly identical, factorizable frequency modes, and few photons in unwanted frequency modes. We focus the pump beam to create a nearly circular joint spectral probability distribution between the two modes. After disentangling the two modes, we observe Hong-Ou-Mandel interference with a raw (background corrected) visibility of 86% (95%) when an 8.6 nm bandwidth spectral filter is applied. We measure second order photon correlations of the entangled and disentangled squeezed states with both superconducting nanowire single-photon detectors and photon-number-resolving transition-edge sensors. Both methods agree and verify that the detected modes contain the desired photon number distributions.

Gerrits, Thomas [National Institute of Standards and Technology (NIST), Boulder; Stevens, Martin [National Institute of Standards and Technology (NIST), Boulder; Baek, Burm [National Institute of Standards and Technology (NIST), Boulder; Calkins, Brice [National Institute of Standards and Technology (NIST), Boulder; Lita, Adriana [National Institute of Standards and Technology (NIST), Boulder; Glancy, Scott [National Institute of Standards and Technology (NIST), Boulder; Knill, Emanuel [National Institute of Standards and Technology (NIST), Boulder; Nam, Sae Woo [National Institute of Standards and Technology (NIST), Boulder; Mirin, Richard [National Institute of Standards and Technology (NIST), Boulder; Hadfield, Robert [Heriot-Watt University, Edinburgh; Bennink, Ryan S [ORNL; Grice, Warren P [ORNL; Dorenbos, Sander [Delft University of Technology, Delft, Netherlands; Zijlstra, Tony [Delft University of Technology, Delft, Netherlands; Klapwijk, Teun [Delft University of Technology, Delft, Netherlands; Zwiller, Val [Delft University of Technology, Delft, Netherlands

2011-01-01T23:59:59.000Z

180

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

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

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

182

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

183

The magnetic and metallic degenerate G77-50  

Science Journals Connector (OSTI)

......photospheric heavy elements via rocky bodies similar in composition...primarily olivines) associated with rocky planet formation (Reach et...composition of, extrasolar rocky, minor or possibly major planets...including cosmic ray masking, flat fielding, wavelength calibration......

J. Farihi; P. Dufour; R. Napiwotzki; D. Koester

2011-06-01T23:59:59.000Z

184

On the Degeneration of Turbulence at High Reynolds Numbers  

E-Print Network [OSTI]

Turbulent fluctuations in a fluid wind down at a certain rate once stirring has stopped. The role of the most basic parameter in fluid mechanics, the Reynolds number, in setting this decay rate is not generally known. This paper concerns the high-Reynolds-number limit of the process. In a wind-tunnel experiment that reached higher Reynolds numbers than ever before and covered more than two decades in the Reynolds number ($10^4 speed of the flow, $M$ the forcing scale, and $\

Sinhuber, Michael; Bewley, Gregory P

2014-01-01T23:59:59.000Z

185

Proposal for a Quantum-Degenerate Electron Source  

Science Journals Connector (OSTI)

We propose a pulsed electron source capable of 6D brightness orders-of-magnitude greater than that of existing sources. It could deliver average current up to 0.5 pA and achieve an emittance approaching the quantum limit in each spatial dimension. It could be employed to advantage in electron microscopy, inverse photo-emission, precision low-energy scattering experiments, and electron holography. This source could make possible pump-probe experiments with Ångstrom spatial and subpicosecond time resolution. Here, we present the basic concepts of the source, including a generalized expression for the brightness that can be used in the quantum limited case and the analysis of the main issues that must be addressed for successful construction and operation. We have begun an experiment to demonstrate its essential features.

M. Zolotorev; E. D. Commins; F. Sannibale

2007-05-03T23:59:59.000Z

186

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

187

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...

188

Age-related alterations in brain ?1-adrenoceptors of hypertensive rats: Their possible role in the development of arterial hypertensionof hypertensive rats: Their possible role in the development of arterial hypertension  

Science Journals Connector (OSTI)

The binding of labeled agonist (3H-prazosin) to ?1...-receptors in the frontal cortex, hypothalamus, and medulla oblongata of hypertensive (NISAG) and normotensive (Wistar) rats of different age is studied to elu...

G. T. Shishkina; A. L. Markel'…

1995-07-01T23:59:59.000Z

189

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]

slow propagation of the burning. The energy released in burning could thus be removed by electron captures, and a hydrostatic C/0 burning phase follo- wed ; at fuel exhaustion core collapse en- sued on the rate of burning and the rate of electron captu- res . A competition between these two pro- cesses

Boyer, Edmond

190

1  

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

Lab team makes unique contributions to Lab team makes unique contributions to the first bionic eye June 27, 2013 As part of the multi-institutional Artificial Retina Project, Los Alamos researchers helped develop the first bionic eye. Recently approved by the U.S. Food and Drug Administration, the Argus II will help people blinded by the rare hereditary disease retinitis pigmentosa or seniors suffering from severe macular degeneration-diseases that destroy the light-sensing cell in the retina. Los Alamos scientists served as the Advanced Concepts team, focusing on fundamental issues and out-of the box ideas. Significance of the research The Argus II operates by using a miniature camera mounted in eyeglasses that captures images and wirelessly sends the information to a microprocessor (worn on a belt) that converts the data to an electronic signal. Pulses from an electrode

191

Chapter 3 - Oxidative Stress Induced by Air Pollution and Exposure to Sunlight  

Science Journals Connector (OSTI)

Air pollution contains small particles, and particles smaller than 10 ?m can generate free radicals when inhaled. In addition, various free radicals may also be present in polluted air. In general, the air quality of urban areas is poorer than that of rural areas. Industrial smoke also contains free radicals and small particles. Breathing polluted air for a long period of time may induce oxidative stress in the body, causing various illnesses including chronic obstructive pulmonary disease and lung cancer. Sunlight contains UV radiation, and prolonged exposure to sunlight or sunbathing without application of sunscreen may cause sunburn, skin damage, and even skin cancer including melanoma, which is linked to oxidative stress. During the summer months when the UV index is high, exposure to sunlight should be reduced or protective clothing should be worn. Moreover, use of sunglasses is recommended because UV light can induce oxidative stress in eyes, causing cataract formation and other eye diseases such as macular degeneration.

Amitava Dasgupta; Kimberly Klein

2014-01-01T23:59:59.000Z

192

New Degeneration of Fay's Identity and its Application to Integrable Systems  

Science Journals Connector (OSTI)

......corresponds to the limit when the four points entering the trisecant...identity states that, for any points a,b,c, and d on a...then is the class of the point in the Jacobian. Therefore , by (A.3), tau lifts to the anti-holomorphic......

Caroline Kalla

2013-01-01T23:59:59.000Z

193

SOME REMARKS ON CONIC DEGENERATION AND BENDING OF POINCARE-EINSTEIN METRICS  

E-Print Network [OSTI]

of this sort (even though the building blocks do). Finally, we also obtain a one-parameter family of PE metrics zero section. We employ a construction by Page and Pope and discuss an interesting multi-parameter family of Poincar´e­Einstein metrics on X. One 1-parameter subfamily {gt}t>0 has the property that as t 0

Mazzeo, Rafe

194

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

195

The ion potential in warm dense matter: wake effects due to streaming degenerate electrons  

E-Print Network [OSTI]

The effective dynamically screened potential of a classical ion in a stationary flowing quantum plasma at finite temperature is investigated. This is a key quantity for thermodynamics and transport of dense plasmas in the warm dense matter regime. To compute this potential a linear response description of the electrons via the Mermin dielectric function is utilized with electron-electron collisions taken into account via a relaxation time approximation. The ion potential strongly deviates from the static Yukawa potential exhibiting the familiar oscillatory structure with attractive minima (wake potential). This potential is analyzed in detail for high-density plasmas with values of the Brueckner parameter in the range $0.1 \\le r_s \\le 1$, for a broad range of plasma temperature and electron streaming velocity. It is shown that wake effects become weaker with increasing temperature of the electrons. Finally, we obtain the minimal electron streaming velocity for which attraction between ions occurs. This veloci...

Moldabekov, Zhandos; Bonitz, Michael; Ramazano, Tlekkabul

2014-01-01T23:59:59.000Z

196

Dissociation of duration-based and beat-based auditory timing in cerebellar degeneration  

Science Journals Connector (OSTI)

...mechanism distinct from the stopwatch-type device that we suggest for single intervals. The...has previously been promoted as a device that both measures absolute interval duration...Chen JL Penhune VB Zatorre RJ ( 2008 ) Listening to musical rhythms recruits motor regions...

Manon Grube; Freya E. Cooper; Patrick F. Chinnery; Timothy D. Griffiths

2010-01-01T23:59:59.000Z

197

Retinal Degeneration and Ionizing Radiation Hypersensitivity in a Mouse Model for Cockayne Syndrome  

Science Journals Connector (OSTI)

...sensitive to a single dose of ionizing radiation at doses up to 10 Gy. In marked...least within the age range investigated, the...photoreceptor cells for ionizing radiation. This finding underscores...experiment (cumulative dose, 35 kJ/m2). The...

Theo G. M. F. Gorgels; Ingrid van der Pluijm; Renata M. C. Brandt; George A. Garinis; Harry van Steeg; Gerard van den Aardweg; Gerard H. Jansen; Jan M. Ruijter; Arthur A. B. Bergen; Dirk van Norren; Jan H. J. Hoeijmakers; Gijsbertus T. J. van der Horst

2006-12-04T23:59:59.000Z

198

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

199

Cribriform Degeneration (cri): A New Recessive Neurological Mutation in the Mouse  

Science Journals Connector (OSTI)

...were uncolored in frozen or wax sections stained for lipids (Sudan dyes), or for carbohydrate polymers (periodic acid-Schiff...nonrepeated DNA with total nonradioactive DNA, followed by assay of thermal stability (10). The albumin immunological distances were...

Margaret C. Green; Richard L. Sidman; Omar H. Pivetta

1972-05-19T23:59:59.000Z

200

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

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

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

Science Journals Connector (OSTI)

Then, without assumptions on the limit of f..., we give a sharp estimate of the low eigenvalnes, using a Born Oppenheimer approximation. With a refined approach we localize...h.

Françoise Truc

2009-01-01T23:59:59.000Z

202

Energy conversion in degenerate four-photon mixing in birefringent fibers  

Science Journals Connector (OSTI)

We predict that the third-order parametric mixing of a pump with a pair of orthogonally polarized sidebands in a birefringent single-mode optical fiber may be spatially unstable. The...

Cappellini, G; Trillo, S

1991-01-01T23:59:59.000Z

203

Monte Carlo simulation of electron transport in degenerate and inhomogeneous semiconductors  

E-Print Network [OSTI]

energy conversion devices and they are also used in the highly doped source/drain regions of advanced transistors. At high carrier densities, the electron distribution is highly affected by its fermionic nature results such as the decrease of av- erage electron energy with the increase of electric field and values

204

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

205

J. Am. Chem. SOC.1991, 113, 3451-3458 3451 Degenerate Transesterification of  

E-Print Network [OSTI]

between lithium 3,5-dimethylphenolate-d6and a series of 3,5-dimethyIphenyl esters have been determined-tetrahydrofuroate, 2-furoate, (N,N-dimethylamino)acetate,(methylthio)acetate, 2- and 4-pyridine- carboxylates,2. These results are interpreted in terms of a preequilibrium in which a solventon lithium in the tetramer

Smith, Bradley D.

206

DIFFERENCE-QUADRATURE SCHEMES FOR NONLINEAR DEGENERATE PARABOLIC INTEGRO-PDE  

E-Print Network [OSTI]

equation. This work was supported by the Research Council of Norway (NFR) through the project "Integro of the the international research program on Nonlinear Partial Differential Equations at the Centre for Advanced Study) is a positive, possibly singular, Radon measure on RM \\{0}; precise assumptions will be given later. The non

207

Ubiquitinated TDP-43 in Frontotemporal Lobar Degeneration and Amyotrophic Lateral Sclerosis  

Science Journals Connector (OSTI)

...13 P. Poorkaj et al., Ann. Neurol. 43 , 815 ( 1998 ). 14 M. Hutton et al., Nature 393 , 702 ( 1998 ). 15 R. Rademakers et al., Mol. Psychiatry 7 , 1064 ( 2002 ). 16 I. R. Mackenzie et al., Brain 129 , 853 ( 2006 ). 17 C. L. Lendon...

Manuela Neumann; Deepak M. Sampathu; Linda K. Kwong; Adam C. Truax; Matthew C. Micsenyi; Thomas T. Chou; Jennifer Bruce; Theresa Schuck; Murray Grossman; Christopher M. Clark; Leo F. McCluskey; Bruce L. Miller; Eliezer Masliah; Ian R. Mackenzie; Howard Feldman; Wolfgang Feiden; Hans A. Kretzschmar; John Q. Trojanowski; Virginia M.-Y. Lee

2006-10-06T23:59:59.000Z

208

Reversal of end-stage retinal degeneration and restoration of visual function by photoreceptor transplantation  

Science Journals Connector (OSTI)

...inner, middle, and outer nuclear layer...DMSO; 0.1% pluronic acid dispersant) for 1.5 h at 30 °C...which had no preexisting outer nuclear layer. (E ZZQQhyG...A) WT retina showing thee nuclear layers in the normal thick...

Mandeep S. Singh; Peter Charbel Issa; Rachel Butler; Chris Martin; Daniel M. Lipinski; Sumathi Sekaran; Alun R. Barnard; Robert E. MacLaren

2013-01-01T23:59:59.000Z

209

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

210

Stochastic Pulse Switching in a Degenerate Resonant Optical Medium Ethan P. Atkins,1  

E-Print Network [OSTI]

with disordered occupation numbers of its lower energy sub-level pair. The description combines complete integrability and stochastic dynamics. For the single-soliton pulse, we derive the statistics of the electric pulses with the resonant car

Kramer, Peter

211

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

212

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...

213

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...

214

Spinach Cultigen Variation for Tissue Carotenoid Concentrations Influences Human Serum Carotenoid Levels and Macular Pigment Optical Density Following a 12-Week Dietary Intervention  

Science Journals Connector (OSTI)

Spinach seeds were sown in artificial media (Pro-mix BX; Premier Horticulture, Dorval, Quebec, Canada) on April 16, 2002, and April 28, 2003. ... The targets were composed of two modulating lights, a 570-nm reference light (1.7 log Tds) and a 460-nm test light, superimposed on a 6°, 470-nm background (1.5 log Tds). ... (American Society for Horticultural Science) ...

Dean A. Kopsell; Mark G. Lefsrud; David E. Kopsell; Adam J. Wenzel; Catherine Gerweck; Joanne Curran-Celentano

2006-09-27T23:59:59.000Z

215

Oxidative Stress and Skeletal Health with Low Dose, Ionizing Radiation  

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

Oxidative Stress and Skeletal Health with Low Dose, Ionizing Radiation Oxidative Stress and Skeletal Health with Low Dose, Ionizing Radiation Globus Ruth NASA Ames Research Center Abstract Osteoporosis profoundly affects the aging U.S. population and exposure to high doses of radiation causes bone loss similar to age-related osteoporosis, although the influence of low dose radiation exposures is not known. The central hypothesis of our DOE project (NASA supplement) is that low doses of radiation modulate subsequent skeletal degeneration via oxidative pathways. Our working hypothesis is that a prior exposure to low dose radiation regulates oxidative metabolism within bone and contributes to bone loss caused either by subsequent high, challenge doses of radiation or by aging. HZE source: Because astronauts are exposed to radiation from GCR and solar

216

Monte Carlo study of degenerate ground states and residual entropy in a frustrated honeycomb lattice Ising model  

E-Print Network [OSTI]

lattice Ising model Shawn Andrews and Hans De Sterck Department of Applied Mathematics, University a classical fully frustrated honeycomb lattice Ising model using Markov-chain Monte Carlo methods and exact effective- ness on the Ising Hamiltonian with and without perturbative interactions. The two perturbations

De Sterck, Hans

217

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

E-Print Network [OSTI]

application of this new spectroscopic technique to an atmospheric pressure plasma synthesis reactor. DFWM synthesis at atmospheric pressure have been performed using an r.f. inductively coupled plasma torch [1 of atmospheric pressure diamond deposition T. G. Owano and C. H. Kruger Iti~'4h7~,mperatureGasdynamies Laboratory

Zare, Richard N.

218

Traumatic brain injury induces neuroinflammation and neuronal degeneration that is associated with escalated alcohol self-administration in rats  

Science Journals Connector (OSTI)

AbstractBackground Traumatic brain injury (TBI) affects millions of people each year and is characterized by direct tissue injury followed by a neuroinflammatory response. The post-TBI recovery period can be associated with a negative emotional state characterized by alterations in affective behaviors implicated in the development of Alcohol Use Disorder in humans. The aim of this study was to test the hypothesis that post-TBI neuroinflammation is associated with behavioral dysfunction, including escalated alcohol intake. Methods Adult male Wistar rats were trained to self-administer alcohol prior to counterbalanced assignment into naïve, craniotomy, and TBI groups by baseline drinking. TBI was produced by lateral fluid percussion (LFP; >2 ATM; 25 ms). Alcohol drinking and neurobehavioral function were measured at baseline and following TBI in all experimental groups. Markers of neuroinflammation (GFAP and ED1) and neurodegeneration (FJC) were determined by fluorescence histochemistry in brains excised at sacrifice 19 days post-TBI. Results The cumulative increase in alcohol intake over the 15 days post-TBI was greater in TBI animals compared to naïve controls. A higher rate of pre-injury alcohol intake was associated with a greater increase in post-injury alcohol intake in both TBI and craniotomy animals. Immediately following TBI, both TBI and craniotomy animals exhibited greater neurobehavioral dysfunction compared to naïve animals. GFAP, IBA-1, ED1, and FJC immunoreactivity at 19 days post-TBI was significantly higher in brains from TBI animals compared to both craniotomy and naïve animals. Conclusions These results show an association between post-TBI escalation of alcohol drinking and marked localized neuroinflammation at the site of injury. Moreover, these results highlight the relevance of baseline alcohol preference in determining post-TBI alcohol drinking. Further investigation to determine the contribution of neuroinflammation to increased alcohol drinking post-TBI is warranted.

Jacques P. Mayeux; Sophie X. Teng; Paige S. Katz; Nicholas W. Gilpin; Patricia E. Molina

2015-01-01T23:59:59.000Z

219

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

220

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

E-Print Network [OSTI]

directions in ICBM space. SLF and ILF denote the superiorfasciculus Superior longitudinal fasciculus (slf) Uncinatefasciculus Temporal slf Model ?t: ? 2 (d? 2 (df), p)

Jahanshad, Neda

2012-01-01T23:59:59.000Z

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.


221

About the Artificial Retina Project  

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

Overview of the Overview of the Artificial Retina Project The DOE Artificial Retina Project was a multi-institutional collaborative effort to develop and implant a device containing an array of microelectrodes into the eyes of people blinded by retinal disease. The ultimate goal was to design a device to help restore limited vision that enables reading, unaided mobility, and facial recognition. The device is intended to bypass the damaged eye structure of those with retinitis pigmentosa and macular degeneration. These diseases destroy the light-sensing cells (photoreceptors, or rods and cones) in the retina, a multilayered membrane located at the back of the eye. For more information, see How the Artificial Retina Works. History The DOE project builds on the foundational work of its leader, Mark Humayun at the Doheny Eye Institute of the University of Southern California. In a breakthrough operation performed in 2002, a team led by Humayun successfully implanted the first device of its kind-an array containing 16 microelectrodes-into the eye of a patient who had been blind for more than 50 years. Since then, more than 30 additional volunteers around the world have had first- or second-generation (60-electrode) devices implanted. These devices enable patients to distinguish light from dark and localize large objects. For more information, read patient stories.

222

Characterization of Petroleum Refinery Lp Results Under Conditions of Degeneracy.  

E-Print Network [OSTI]

??The phenomenon of degeneracy inevitably occurs in most large LP models. An LP could be primal degenerate, dual degenerate, or both primal and dual degenerate.… (more)

Arjunan, Jeyarathan

2010-01-01T23:59:59.000Z

223

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

224

Comparative Evaluation of PCR and Imprint Smear Microscopy Analyses of Skin Biopsy Specimens in Diagnosis of Macular, Papular, and Mixed Papulo-Nodular Lesions of Post-Kala-Azar Dermal Leishmaniasis  

Science Journals Connector (OSTI)

...studies from India and Sudan reported positive PCR...Bangladesh, India, and Sudan studies, a minicircle...of the parasite in the thermal cycles, the possibility...Bangladesh, India, and Sudan studies, a minicircle...of the parasite in the thermal cycles, the pos- sibility...

Neena Verma; Dharmendra Singh; Krishna Pandey; Vidya Nand Rabi Das; Chandra Shekhar Lal; Rakesh Bihari Verma; Prabhat Kumar Sinha; Pradeep Das

2013-09-25T23:59:59.000Z

225

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

226

Swift X-ray and ultraviolet observations of the shortest orbital period double-degenerate system RX J0806.3+1527 (HM Cnc)  

E-Print Network [OSTI]

RX J0806.3+1527 (HM Cnc) is a pulsating X-ray source with 100 per cent modulation on a period of 321.5 s (5.4 min). This period reflects the orbital motion of a close binary system consisting of two interacting white dwarfs. Here we present a series of simultaneous X-ray (0.2-10 keV) and near-ultraviolet (2600 angstrom and 1928 angstrom) observations carried out with the Swift satellite. In the near-ultraviolet the counterpart of RX J0806.3+1527 was detected at flux densities consistent with a blackbody with temperature 27E+3 K. We found that the emission at 2600 angstrom is modulated at the 321.5-s period, with the peak ahead of the X-ray one by 0.28 cycles and coincident, within 0.05 cycles, with the optical. This phase-shift measurement confirms that the X-ray hot spot (located on the primary white dwarf) is at about 80-100 degrees from the direction connecting the two white dwarfs. Albeit at lower significance, the 321.5-s signature is present also in the 1928-angstrom data; at this wavelength, however, t...

Esposito, P; Dall'Osso, S; Covino, S

2013-01-01T23:59:59.000Z

227

Fusion Rules of the Lowest Weight Representations of osp_q(1|2) at Roots of Unity: Polynomial Realization and Degeneration at Roots of Unity  

E-Print Network [OSTI]

The degeneracy of the lowest weight representations of the quantum superalgebra $osp_q(1|2)$ and their tensor products at exceptional values of %when deformation parameter $q$ takes exceptional values is studied. The main features of the structures of the finite dimensional lowest weight representations and their fusion rules are illustrated using realization of group generators as finite-difference operators acting in the space of the polynomials. The complete fusion rules for the decompositions of the tensor products at roots of unity are presented. The appearance of indecomposable representations in the fusions is described using Clebsh-Gordan coefficients derived for general values of $q$ and at roots of unity.

D. Karakhanyan; Sh. Khachatryan

2006-02-08T23:59:59.000Z

228

Inhibition of the Development of Metastatic Squamous Cell Carcinoma in Protein Kinase C ? Transgenic Mice by ?-Difluoromethylornithine Accompanied by Marked Hair Follicle Degeneration and Hair Loss  

Science Journals Connector (OSTI)

...period of 30 min with fluorescent detection (excitation...hyperplasia of the bulb region with an increase...transgenic mice and led to marked alopecia...of the follicular bulb in the anagen (growth...with TPA promotion, led to almost complete...

Deric L. Wheeler; Kristin J. Ness; Terry D. Oberley; and Ajit K. Verma

2003-06-15T23:59:59.000Z

229

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

230

Drug Therapy: Treatment of Diabetic Retinopathy  

Science Journals Connector (OSTI)

...macular edema. Fluorescein angiography can be used to identify patients with excessive vascular permeability, but leakage of fluorescein into the retina does not necessarily indicate macular edema. Macular edema is defined as retinal thickening resulting from the accumulation of fluid and can best be seen... Diabetic retinopathy has been and probably remains one of the four major causes of blindness in the United States.1,2 The risk of retinopathy is directly related to the degree and duration of hyperglycemia.3 After diabetes mellitus has been present for 20 ...

Ferris F.L.Davis M.D.Aiello L.M.

1999-08-26T23:59:59.000Z

231

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

232

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

233

E-Print Network 3.0 - adult muscle fibres Sample Search Results  

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

fibres Search Powered by Explorit Topic List Advanced Search Sample search results for: adult muscle fibres Page: << < 1 2 3 4 5 > >> 1 ELECTRICAL STIMULATION REDUCES AGE RELATED...

234

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

235

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...

236

E-Print Network 3.0 - aging learning disease Sample Search Results  

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

system will be catastrophic. My research focuses on the age... related decline in cognitive function and age ... Source: Engstrom, Tag N. - Department of Biological Sciences,...

237

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...

238

AUDIT REPORT  

Energy Savers [EERE]

condition of the roof; structural deficiencies, to include interiorexterior walls and beams; water intrusion; and electrical equipment. As noted by officials, age-related...

239

E-Print Network 3.0 - adult rat sensory Sample Search Results  

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

>> 1 ELECTRICAL STIMULATION REDUCES AGE RELATED ATROPHY AND WEAKNESS IN EDL MUSCLES OF RATS Summary: the atrophy and weakness. We electrically stimulated EDL muscles of adult and...

240

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

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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,...

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

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

242

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

243

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

244

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

245

Non-Abelian Geometric Phase, Floquet Theory, and Periodic Dynamical Invariants  

E-Print Network [OSTI]

For a periodic Hamiltonian, periodic dynamical invariants may be used to obtain non-degenerate cyclic states. This observation is generalized to the degenerate cyclic states, and the relation between the periodic dynamical invariants and the Floquet decompositions of the time-evolution operator is elucidated. In particular, a necessary condition for the occurrence of cyclic non-adiabatic non-Abelian geometrical phase is derived. Degenerate cyclic states are obtained for a magnetic dipole interacting with a precessing magnetic field.

Ali Mostafazadeh

1998-10-22T23:59:59.000Z

246

Non-Abelian Geometric Phase, Floquet Theory, and Periodic Dynamical Invariants  

E-Print Network [OSTI]

For a periodic Hamiltonian, periodic dynamical invariants may be used to obtain non-degenerate cyclic states. This observation is generalized to the degenerate cyclic states, and the relation between the periodic dynamical invariants and the Floquet decompositions of the time-evolution operator is elucidated. In particular, a necessary condition for the occurrence of cyclic non-adiabatic non-Abelian geometrical phase is derived. Degenerate cyclic states are obtained for a magnetic dipole interacting with a precessing magnetic field.

Mostafazadeh, A

1998-01-01T23:59:59.000Z

247

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

248

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,...

249

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

250

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...

251

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...

252

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...

253

The Role of Tau Oligomers in the Onset of Alzheimer's Disease Neuropathology  

Science Journals Connector (OSTI)

Mackenzie, I. R. and Rademakers, R. ( 2007) The molecular genetics and neuropathology of frontotemporal lobar degeneration: recent developments Neurogenetics 8, 237– 248 ... Mackenzie Ian R A; Rademakers Rosa ...

María del Carmen Cárdenas-Aguayo; Laura Gómez-Virgilio; Steven DeRosa; Marco Antonio Meraz-Ríos

2014-09-30T23:59:59.000Z

254

E-Print Network 3.0 - absent pulmonary valve Sample Search Results  

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

Science 3 Insertion of Heart Valves by Catheterization Design Team Summary: treatment (patch) results in degenerated pulmonary heart valves. Open-heart surgery is expensive,...

255

R&D for a Soft X-Ray Free Electron Laser Facility  

E-Print Network [OSTI]

Quantum-degenerate Electron Source, Physical Review LettersHigh brightness electron source, beam instrumentation andFEL Requires high rep-rate electron source Beam switchyard

Staples, John

2009-01-01T23:59:59.000Z

256

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

257

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

E-Print Network [OSTI]

oxide (NO) pathway in the skeletal muscle vasculature. The major purpose of this dissertation is to determine the mechanisms that mediate age-related endothelial dysfunction in rat soleus feed artery (SFA) and determine whether exercise training...

Trott, Daniel Wayne

2012-02-14T23:59:59.000Z

258

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...

259

Gordon Research Conferences  

Science Journals Connector (OSTI)

...sap-phire: a transmission electron microscopic study." (Benjamin A. Wilcox, session chairman): J. Philibert, "Mechanisms...age-related metabolism of furosemide in man and dogs"; Jeffery P. Redmond, "Metabo-lism of ethanol in children"; A...

Alexander M. Cruickshank

1976-03-12T23:59:59.000Z

260

Modulation of multiple pathways involved in the maintenance of neuronal function during aging by fisetin  

Science Journals Connector (OSTI)

Multiple factors have been implicated in the age-related declines in brain function. Thus, it is unlikely that modulating only a single factor will be effective at slowing this decline. A better approach is to id...

Pamela Maher

2009-12-01T23:59:59.000Z

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.


261

MUSICAL PREFERENCES OF ELEMENTARY SCHOOL CHILDREN Heiner Gembris & Gabriele Schellberg  

E-Print Network [OSTI]

= .000, Kruskal-Wallis) age-related changes in preferences regarding all types of music. Pop music regarding all types of music are highly significant (p = .000, Kruskal-Wallis). With increasing age, all

Noé, Reinhold

262

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

263

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

264

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

265

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

266

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

267

A kinetic beam scheme for ideal quantum gas dynamics  

Science Journals Connector (OSTI)

...profiles at most stations are close to Gaussian...Example 2 Boson gas in nearly degenerate...limit case at several stations at time t=0.3...Example 3 Fermion gas in near classical...profiles at most stations are close to Gaussian...Example 4 Fermion gas in nearly degenerate...

2006-01-01T23:59:59.000Z

268

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

269

Household portfolios in Japan  

Science Journals Connector (OSTI)

I provide a detailed description and in-depth analysis of household portfolios in Japan. (1) It is shown that the share of equities in financial wealth and the stock market participation of Japanese households decreased throughout the 1990s. (2) Using survey data, age-related variations in the share of stocks in financial wealth are analyzed. The equity share and stock market participation increase with age among young households, peaking when people reach their 50s, and then stabilizing. However, the share of equities conditional on ownership exhibits no significant age-related pattern, implying that age-related patterns are primarily explained by the decision to hold stocks. A similar mechanism operates to that found in previous studies of Western countries. (3) Owner-occupied housing has a significantly positive effect on stock market participation and on the share of stocks in financial wealth.

Tokuo Iwaisako

2009-01-01T23:59:59.000Z

270

“Cold nuclear fusion”: A hypothetical model to probe an elusive phenomenon  

Science Journals Connector (OSTI)

The natural tendency of identical bosons to clump in ordinary space is ascribed to a “symmetry force,” whose action is equivalent to the effects of the wavefunction for a collection of degenerate bosons. The s...

Robert T. Bush; Robert D. Eagleton

1990-12-01T23:59:59.000Z

271

Progenitor mass constraints for core-collapse supernovae from correlations with host galaxy star formation  

Science Journals Connector (OSTI)

......occurs after successive stages of nuclear fusion lead to the formation of a degenerate iron core. Nuclear fusion is then energetically unfavourable...Science (P10-064-F), with input from Fondo de Innovacin para la......

J. P. Anderson; S. M. Habergham; P. A. James; M. Hamuy

2012-08-01T23:59:59.000Z

272

Converting an atomic Fermi gas into a long-lived molecular Bose gas  

Science Journals Connector (OSTI)

A quantum degenerate Fermi gas of 6Li atoms is converted into an ultracold gas of 6Li2 molecules using a Feshbach resonance. Up to 1.5 x 105 molecules are produced and trapped for up...

Strecker, Kevin E; Partridge, Guthrie B; Hulet, Randall G

273

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

274

The British Association at Winnipeg Section H.  

Science Journals Connector (OSTI)

... them children of wrath, degenerate offspring of Cain; the learned fell back upon pre-Adamite fictions, to palliate, rather than to explain their invincible ignorance of Europe and its ...

1909-09-23T23:59:59.000Z

275

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

276

Extremal Dependence Indices: Improved Verification Measures for Deterministic Forecasts of Rare Binary Events  

Science Journals Connector (OSTI)

Verifying forecasts of rare events is challenging, in part because traditional performance measures degenerate to trivial values as events become rarer. The extreme dependency score was proposed recently as a nondegenerating measure for the ...

Christopher A. T. Ferro; David B. Stephenson

2011-10-01T23:59:59.000Z

277

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

E-Print Network [OSTI]

A fully differential Complementary Metal-Oxide Semiconductor (CMOS) Variable Gain Amplifier (VGA) consisting of complementary differential pairs with source degeneration, a current gain stage with programmable current mirror, and resistor loads...

Chen, Lin

2007-09-17T23:59:59.000Z

278

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

279

Low-Dose Memantine Attenuated Morphine Addictive Behavior Through its Anti-Inflammation and Neurotrophic Effects in Rats  

Science Journals Connector (OSTI)

Opioid abuse and dependency are international problems. Studies have shown that neuronal inflammation and degeneration might be related to the development of opioid addiction. Thus, using neuroprotective agents m...

Shiou-Lan Chen; Pao-Luh Tao; Chun-Hsien Chu…

2012-06-01T23:59:59.000Z

280

develop noninflammatory degenerative joint disease. Proc Natl Acad Sci U S A. 1994;91:5070-5074.  

E-Print Network [OSTI]

. Kimura T, Nakata K, Tsumaki N, et al. Progressive degeneration of articular car- tilage mice defective in aggrecan. Proc Natl Acad Sci U S A. 1997;94:6943-6947. Statins and Fracture Risk Sean

Hennessy, Sean

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

Synaptic Transmission Depressed by Colchicine Blockade of Axoplasmic Flow  

Science Journals Connector (OSTI)

...AXOPLASMIC FLOW RATES IN MONKEY OPTIC SYSTEM, NEUROLOGY 20 : 607 ( 1970 ). CUENOD, M, IN PRESS . CUENOD, M, INFORMATION TRANSFER . CUENOD, M, ENLARGED SYNAPTIC VESICLES AS AN EARLY SIGN OF SECONDARY DEGENERATION IN OPTIC NERVE TERMINALS...

M. Peri?I?; M. Cuénod

1972-03-10T23:59:59.000Z

282

Nucleon form factors with N{sub F} = 2 twisted mass fermions  

SciTech Connect (OSTI)

We present results on the nucleon form factors using two degenerate flavors of twisted mass fermions on 24{sup 3}x48 and 32x64 lattices with pion masses in the range 290 divide 485 MeV.

Guichon, P.; Baron, R. [CEA-Saclay, IRFU/SPhN, 91191 Gif-sur-Yvette (France); Alexandrou, C.; Korzec, T.; Koutsou, G. [Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia (Cyprus); Brinet, M.; Carbonell, J.; Harraud, P.-A. [Laboratoire de Physique Subatomique et Cosmologie, UJF/CNRS/IN2P3, 53 avenue des Martyrs, 38026 Grenoble (France); Jansen, K. [NIC, DESY, Platanenallee 6, D-15738 Zeuthen (Germany)

2010-07-27T23:59:59.000Z

283

A collagen-GAG matrix for the growth of intervertebral disc tissue  

E-Print Network [OSTI]

Intervertebral disc (IVD) degeneration and herniation is a significant problem, more so in the aviation field. The IVD also changes during spaceflight. Current treatments for IVD problems can have unfavorable long-term ...

Hastreiter, Dawn (Dawn Marie), 1973-

2002-01-01T23:59:59.000Z

284

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

285

Chitinase production in pine callus (Pinus sylvestris L.): a defense reaction against endophytes?  

Science Journals Connector (OSTI)

In shoot tip-derived tissue cultures of Scots pine (Pinus sylvestris L.), browning and subsequent degeneration of the culture is accompanied by lipid peroxidation and lignification of cells, which are characteri...

Anna Pirttilä; Hanna Laukkanen; Anja Hohtola

2002-04-01T23:59:59.000Z

286

Stabilizability of the linear algebro-differential one-input control systems  

Science Journals Connector (OSTI)

Consideration was given to the controllable system of ordinary linear differential equations with the matrix at the derivative of the desired vector function that is identically degenerate in the domain of definition. For the one-input systems, the questions ...

A. A. Shcheglova

2010-09-01T23:59:59.000Z

287

Isolation and identification of the pollen-expressed polymorphic F-box genes linked to the S-locus in apple (Malus × domestica)  

Science Journals Connector (OSTI)

Using degenerate primers designed based on the conserved regions of the reported SLF/SFB genes, more than a dozen of different cDNA clones were isolated from pollen of three different apple S-genotypes by reverse...

Jianhong Cheng; Zhenhai Han; Xuefeng Xu; Tianzhong Li

2006-12-01T23:59:59.000Z

288

A GENUINELY HIGH ORDER TOTAL VARIATION DIMINISHING ...  

E-Print Network [OSTI]

(TVD) schemes solving one-dimensional scalar conservation laws degenerate to first order .... where the total variation is measured by the standard bounded variation ..... interval Ij and into the jump discontinuities at cell interfaces, see [12].

289

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

290

Parasupersymmetry in Quantum Graphs  

E-Print Network [OSTI]

We study hidden parasupersymmetry structures in purely bosonic quantum mechanics on compact equilateral graphs. We consider a single free spinless particle on the graphs and show that the Huang-Su parasupersymmetry algebra is hidden behind degenerate spectra.

Satoshi Ohya

2012-10-29T23:59:59.000Z

291

Parasupersymmetry in Quantum Graphs  

E-Print Network [OSTI]

We study hidden parasupersymmetry structures in purely bosonic quantum mechanics on compact equilateral graphs. We consider a single free spinless particle on the graphs and show that the Rubakov-Spiridonov-Khare-Tomiya parasupersymmetries are hidden behind degenerate spectra.

Ohya, Satoshi

2012-01-01T23:59:59.000Z

292

Efficient Strategies for Accurate Calculations of Electronic Excitation and Ionization Energies: Theory and Application to the Dehydro-m-xylylene Anion  

E-Print Network [OSTI]

Efficient Strategies for Accurate Calculations of Electronic Excitation and Ionization Energies of calculating electronic states of DMX- is g; et al. J. Org. Chem. 2004, 69, 5735], three nearly degenerate orbitals host four electrons, which

Krylov, Anna I.

293

Neuromotor Transmissibility of Horizontal Seatpan Vibration  

E-Print Network [OSTI]

Exposure to occupational whole body vibration (WBV) is associated with low back pain disorders, musculoskeletal disorders, and degeneration of spine. Transmission of vibration to the neuromotor system may play a role in the etiology...

Channamallu, Raghu Ram

2007-12-16T23:59:59.000Z

294

Vibration-Rotation Bands of Trideuteromethyl Iodide  

Science Journals Connector (OSTI)

5 October 1965 research-article Vibration-Rotation Bands of Trideuteromethyl...of six parallel and nine perpendicular vibration bands of trideuteromethyl iodide has...constants for the fundamental degenerate vibrations. The values for overtone and combination...

1965-01-01T23:59:59.000Z

295

Energy transfer between incident laser and elastically backscattered waves in nonlinear absorption media  

Science Journals Connector (OSTI)

A model of energy transfer by nearly degenerate two-beam coupling in media exhibiting two-photon and excited state absorption is presented and discussed. The two beams include an...

Sutherland, Richard

2005-01-01T23:59:59.000Z

296

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

297

Perturbation theory of von Neumann Entropy  

E-Print Network [OSTI]

In quantum information theory, von Neumann entropy plays an important role. The entropies can be obtained analytically only for a few states. In continuous variable system, even evaluating entropy numerically is not an easy task since the dimension is infinite. We develop the perturbation theory systematically for calculating von Neumann entropy of non-degenerate systems as well as degenerate systems. The result turns out to be a practical way of the expansion calculation of von Neumann entropy.

Xiao-yu Chen

2009-02-27T23:59:59.000Z

298

Gender affordances of conversational agents  

Science Journals Connector (OSTI)

......norms, which on the Internet is thought to be induced...as the use of verbal abuse, strongly depends on...website was homogeneous. Young people between the ages...relative to the average internet population, whereas...underage users (note: the youngest age considered by Alexa......

Sheryl Brahnam; Antonella De Angeli

2012-05-01T23:59:59.000Z

299

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

300

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

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

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

302

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.

303

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

304

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

305

Formulation of the MFS for the two-dimensional Laplace equation with an added constant and constraint  

Science Journals Connector (OSTI)

Abstract Motivated by the incompleteness of single-layer potential approach for the interior problem with a degenerate-scale domain and the exterior problem with bounded potential at infinity, we revisit the method of fundamental solutions (MFS). Although the MFS is an easy method to implement, it is not complete for solving not only the interior 2D problem in case of a degenerate scale but also the exterior problem with bounded potential at infinity for any scale. Following Fichera?s idea for the boundary integral equation, we add a free constant and an extra constraint to the traditional MFS. The reason why the free constant and extra constraints are both required is clearly explained by using the degenerate kernel for the closed-form fundamental solution. Since the range of the single-layer integral operator lacks the constant term in the case of a degenerate scale for a two dimensional problem, we add a constant to provide a complete base. Due to the rank deficiency of the influence matrix in the case of a degenerate scale, we can promote the rank by simultaneously introducing a constant term and adding an extra constraint to enrich the MFS. For an exterior problem, the fundamental solution does not contain a constant field in the degenerate kernel expression. To satisfy the bounded potential at infinity, the sum of all source strengths must be zero. The formulation of the enriched MFS can solve not only the degenerate-scale problem for the interior problem but also the exterior problem with bounded potential at infinity. Finally, three examples, a circular domain, an infinite domain with two circular holes and an eccentric annulus were demonstrated to see the validity of the enriched MFS.

Jeng-Tzong Chen; Jheng-Lin Yang; Ying-Te Lee; Yu-Lung Chang

2014-01-01T23:59:59.000Z

306

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

307

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

308

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

309

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

310

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

311

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

312

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

313

A description of the paraventricular and supraoptic nuclei of the bovine hypothalamus  

E-Print Network [OSTI]

. Brettscbneider (19S4) observed the eccentric lecatioa of the nucleus vithin ths supreoptic and paraventriculsr nuclei of the horse. He casqssred tbe cells to those of Clsrhe's col~ of the spinel cord snd to cells undergoing degeneration. Vcn Vier ling (1956.... Brettscbneider (19S4) observed the eccentric lecatioa of the nucleus vithin ths supreoptic and paraventriculsr nuclei of the horse. He casqssred tbe cells to those of Clsrhe's col~ of the spinel cord snd to cells undergoing degeneration. Vcn Vier ling (1956...

Talukdar, Amir Hussain

2012-06-07T23:59:59.000Z

314

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

315

Quantum Approach to a Derivation of the Second Law of Thermodynamics  

E-Print Network [OSTI]

We re-interprete the microcanonical conditions in the quantum domain as constraints for the interaction of the "gas-subsystem" under consideration and its environment ("container"). The time-average of a purity-measure is found to equal the average over the respective path in Hilbert-space. We then show that for typical (degenerate or non-degenerate) thermodynamical systems almost all states within the allowed region of Hilbert-space have a local von Neumann-entropy S close to the maximum and a purity P close to its minimum, respectively. Typically thermodynamical systems should therefore obey the second law.

Jochen Gemmer; Alexander Otte; Guenter Mahler

2001-01-30T23:59:59.000Z

316

Charged Vacuum Bubble Stability  

E-Print Network [OSTI]

A type of scenario is considered where electrically charged vacuum bubbles, formed from degenerate or nearly degenerate vacuua separated by a thin domain wall, are cosmologically produced due to the breaking of a discrete symmetry, with the bubble charge arising from fermions residing within the domain wall. Stability issues associated with wall tension, fermion gas, and Coulombic effects for such configurations are examined. The stability of a bubble depends upon parameters such as the symmetry breaking scale and the fermion coupling. A dominance of either the Fermi gas or the Coulomb contribution may be realized under certain conditions, depending upon parameter values.

J. R. Morris

1998-10-20T23:59:59.000Z

317

Crosstalk between Phosphodiesterase 7 and Glycogen Synthase Kinase-3: Two Relevant Therapeutic Targets for Neurological Disorders  

Science Journals Connector (OSTI)

Previous data from our group have shown that different inhibitors of the cyclic adenosine monophosphate (cAMP) specific phosphodiesterase 7 (PDE7) and glycogen synthase kinase-3 (GSK-3) enzymes are potent anti-inflammatory agents in different models of brain injury. ... The increase in life expectancy observed over the last century has led to the increased incidence of a series of age-related disorders, such as neurodegenerative diseases. ...

Jose A. Morales-Garcia; Valle Palomo; Miriam Redondo; Sandra Alonso-Gil; Carmen Gil; Ana Martinez; Ana Perez-Castillo

2014-01-11T23:59:59.000Z

318

LWR Sustainability: Assessment of Aging of Nuclear Power Plant Safety Related Concrete Strutures  

SciTech Connect (OSTI)

Current regulatory testing and inspection requirements are reviewed and a summary of degradation experience is presented. Techniques commonly used to inspect NPP concrete structures to assess and quantify age-related degradation are summarized. An approach for conduct of condition assessments of structures in NPPs is presented. Criteria, based primarily on visual indications, are provided for use in classification and assessment of concrete degradation. Materials and techniques for repair of degraded structures are generally discussed.

Graves III, Herman [U.S. Nuclear Regulatory Commission; Naus, Dan J [ORNL

2013-01-01T23:59:59.000Z

319

Microscopic histochemical changes associated with aging in the feline kidney  

E-Print Network [OSTI]

ACKNOWLEDGEMENTS. TABLE OF CONTENTS Vll LIST OF TABLES. LIST OF FIGURES INTRODUCTION. xii LITERATURE REVIEW Lipid Metabolism Glycolysis Citric Acid Cycle. Transport Enzyme MATERIALS AND METHODS RESULTS Lipid Metabolism Neutral lipid Non-reactive renal... components. Reactive renal components with no signifi- cant age-related trends in lipid concen- tration Reactive renal components with significant age-associated trends in lipid concen- tration 6 9 12 14 17 22 23 23 23 23 25 Adenyl Cyclase...

Kaler, Lawrence William

2012-06-07T23:59:59.000Z

320

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

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

The consequence of late-onset alcohol abuse in aged bone: a histomorhometric analysis  

E-Print Network [OSTI]

of decreased intake and absorption, bone quality is negatively affected because of the decrease in nutrients that determine bone health (calcium, phosphorus, magnesium and vitamin D). Certain age-related physiological changes also promote osteoporosis... of ethanol treatment. Upon analysis of the bone content, they found that alcohol did not have an afFect on the bone mineral content such as calcium, magnesium, and phosphorus. Peng et. al. suggested that alcohol may induce an alteration...

Barker, Lisa Setchfield

2012-06-07T23:59:59.000Z

322

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

323

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

324

Amino Acid Substitution in Trichophyton rubrum Squalene Epoxidase Associated with Resistance to Terbinafine  

Science Journals Connector (OSTI)

...using degenerate primers designed from two stretches of amino acids, which are well conserved among yeast and mammalian SEs: PDRI(V/L)GE(L/C)(M/L)QP and RHPLTGGGMTV (6). The resultant amplicon was cloned and sequenced, and the deduced...

Colin S. Osborne; Ingrid Leitner; Bertrand Favre; Neil S. Ryder

2005-07-01T23:59:59.000Z

325

Revolution may end repression of academic freedom in Tunisia  

Science Journals Connector (OSTI)

... , and things really degenerated around 1992 to 1993. We had pretences of democracy and liberty, but we knew that we were hopeless in terms of human rights such as ... we kept telling ourselves that this would gradually come. One got used to the limited liberty. ...

Declan Butler

2011-01-26T23:59:59.000Z

326

Integrable Hierarchy of Multi-Component Kaup -Boussinesq Equations  

E-Print Network [OSTI]

By using the Lax approach we find the integrable hierarchy of the two and three field Kaup-Boussinesq equations. We then give a multi-component Kaup-Boussinesq equations and their recursion operators. Finally we show that all multi-component Kaup-Boussinesq equations are the degenerate Svinolupov KdV systems.

Metin Gurses

2013-01-17T23:59:59.000Z

327

Multiphase patterns in periodically forced oscillatory systems Christian Elphick  

E-Print Network [OSTI]

to infinity. Quintic nonlinearities lift the degeneracy at the instability point but do not change the basic quarter of the forcing frequency the 4:1 resonance . These systems possess four coexisting stable states. The instability is degenerate for an amplitude equation with cubic nonlinearities. At the instability point

Hagberg, Aric

328

The ‘Indian rope trick’ for a parametrically excited flexible rod: linearized analysis  

Science Journals Connector (OSTI)

...the oscillating support point and !0 is the angular...2000) The exible-rod Indian rope trick 557 When...codimension-two degenerate points. The overall conclusion...extra codimension-two points where tongues collide...as `not quite the Indian rope trick'. It is...

2000-01-01T23:59:59.000Z

329

On the KZK-type equation for modulated ultrasound fields Egor Dontsov and Bojan Guzina  

E-Print Network [OSTI]

, in the context of the time-domain numerical algorithms, dramatically increases the computational effort necessary the model to i) cover a wide range of transducer geometries, and ii) be degenerated to the quasi-static approximation as one of its limiting cases. The formulation is accompanied by a set of numerical examples, which

Guzina, Bojan

330

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

331

Complexity, tunneling, and geometrical symmetry L. P. Horwitz,1,2,3  

E-Print Network [OSTI]

Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel 3 School of Physics, Raymond and Beverly classical chaotic behavior and the rate of tunneling in the corresponding quantum system. The conclu- sion or to the left , certain positions are passed where the system becomes strongly near-degenerate. These positions

Ashkenazy, Yossi "Yosef"

332

The Jordan socle and finitary Lie algebras Antonio Fernandez Lopez 1  

E-Print Network [OSTI]

1 The Jordan socle and finitary Lie algebras Antonio Fern´andez L´opez 1 Departamento de ´Algebra introduce the notion of Jordan socle for nondegenerate Lie al- gebras, which extends the definition of socle given in [7] for 3-graded Lie algebras. Any non- degenerate Lie algebra with essential Jordan socle

333

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

334

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

E-Print Network [OSTI]

generating a great deal of interest in high-energy physics is the neutrino mixing angle 13. Water Cherenkov flavor eigenstates (e, , ) in both atmospheric and solar neutrinos, implying non-degenerate mass measure sin2 213 with equal sensitivity more cheaply and quickly is a next-generation reactor neutrino

335

Searches for supersymmetric particles produced in Z-boson decay  

Science Journals Connector (OSTI)

We have searched for supersymmetric particles in 528 Z decays with the Mark II detector at the SLAC Linear Collider. We place 95%-confidence-level lower mass limits on degenerate squarks, nondegenerate up-type squarks, nondegenerate down-type squarks, charginos, pair-produced unstable neutralinos, and neutralinos from associated production.

T. Barklow et al.

1990-06-18T23:59:59.000Z

336

JOURNAL DE PHYSIQUE Colloque C8, Supplement au no 12, Tome 49, d6cembre 1988  

E-Print Network [OSTI]

and magnetostriction of ferrites are strongly influenced by transition metal ions with an orbitally degenerate ground.4, a Ver- wey type transition from the cubic to the orthorhom- bic phase is observed in a similar way series GarFe3-r04 (0.1 5 x 5 1)have been measured as a function of temperature. A Verwey type transition

Boyer, Edmond

337

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

338

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

339

Differential entropy in wavelet sub-band for assessment of glaucoma  

Science Journals Connector (OSTI)

Glaucoma is an eye disease that causes progressive optic neuropathy and vision loss due to degeneration of the optic nerves. Cup to disc ratio (CDR) is the standard measure for evaluation of glaucoma. It is difficult to estimate the value of CDR if the ... Keywords: cup to disc ratio, differential entropy, glaucoma, wavelet sub-band

Malaya Kumar Nath; Samarendra Dandapat

2012-09-01T23:59:59.000Z

340

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

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

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.

342

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

343

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

344

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

345

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

346

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

347

MARINE MAMMAL SCIENCE,1J(l):210-255 Qanuary7)))) @ 1999by the Societyfor MarineMammalogy  

E-Print Network [OSTI]

MARINE MAMMAL SCIENCE,1J(l):210-255 Qanuary7)))) @ 1999by the Societyfor MarineMammalogy COMPARISON of seacows,the dugongs (Dugongidae) and manatees(Trichechidae),have solved the problem of tooth wear very dif are degenerate and quickly wear away(Fig. 1). The last two molarsexhibit root hypsodonty, and theseever

Marsh, Helene

348

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.

349

Effects of vaporization, diffusion and condensation on the combustion of reactive fluids in hot porous media  

Science Journals Connector (OSTI)

...the evaporation and heat-release rates such...remains to permit combustion to fully develop...gure 2. The overall heat-release rate in...degenerate form of the combustion. This resembles...low-temperature oxidation of hydrocarbons in the gaseous and...

2000-01-01T23:59:59.000Z

350

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

351

Explosive Nucleosynthesis in Stars  

Science Journals Connector (OSTI)

... in hydrostatic equilibrium, with considerable effect on the abundances of the ejected matter. The overheating may result either from the fact that the fuels first ignite in a degenerate electron ... pressure wave propagates outward from an exploding core. In either case, large amounts of thermal energy are liberated in a time short compared with the star's ability to compensate ...

W. DAVID ARNETT; DONALD D. CLAYTON

1970-08-22T23:59:59.000Z

352

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

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

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

355

Proc. Natl. Acad. Sci. USA Vol. 86, pp. 9747-9751, December 1989  

E-Print Network [OSTI]

- mentary DNA encoding SRP14 (14-kDa subunit), one of six proteins contained in the signal recognition particle (SRP). Several pools of degenerate oligonucleotides encoding different peptide sequences of SRP14 to identify the authentic SRP14 cDNA clone among the amplified DNA products obtained by PCR. The basis

Walter, Peter

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

Development of a Rapid and Sensitive Method for the Determination of Aluminum by Reverse-Phase High-Performance Liquid Chromatography Using a Fluorescence Detector  

Science Journals Connector (OSTI)

......Aluminum in metal toxicity in mammals (1979) New York: Plenum. 104-112. 3 Craper D.R. , Krishnan S.S., Dalton A.J. Brain aluminium distribution in Alzheimer's disease and experimental neurofibrillary degeneration. Science (1973) 108:511-513......

Heena; Rajesh Kumar; Susheela Rani; Ashok Kumar Malik

2014-10-01T23:59:59.000Z

358

THE NEURAL BASIS OF BRAIN-STIMULATION REWARD E. T. ROLLS  

E-Print Network [OSTI]

3 THE NEURAL BASIS OF BRAIN-STIMULATION REWARD E. T. ROLLS Departmentof Experimental basis of brain-stimulationreward 1.2.1 Brain-stimulationreward sites 1.2.2 Effects of lesions on self-stimulation 1.2.3 The role of physiological concomitants of brain-stimulationreward 1.2.4 Fibre degeneration

Rolls, Edmund T.

359

The High-Temperature Oxidation of Propane  

Science Journals Connector (OSTI)

...research-article The High-Temperature Oxidation of Propane J. W. Falconer J. H. Knox Above 400 degrees C propane is oxidized by a two-stage degenerately...of propylene becomes important. While propane still in the main reacts to form propylene...

1959-01-01T23:59:59.000Z

360

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

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

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

362

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

363

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

364

Finite-Memory Least Squares Universal Prediction of Individual Continuous Sequences  

E-Print Network [OSTI]

the Exponential Decaying Memory (EDM) machine, used in the past for predicting binary sequences, and show bounds consider a class of machines denoted the Degenerated Tracking Memory (DTM) machines that outperform the EDM of individual continuous sequences with square-error loss, using a deterministic finite-state machine (FSM

Feder, Meir

365

Effective boundary condition at a rough surface starting from a slip condition.  

E-Print Network [OSTI]

, set in a channel with a rough boundary, of small amplitude and wavelength . It was shown recently thatEffective boundary condition at a rough surface starting from a slip condition. Anne, for any non-degenerate roughness pattern, and for any reasonable condition imposed at the rough boundary

Gerard-Varet, David - Institut de Mathématiques de Jussieu, Université Paris 7

366

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

367

Torsion?Vibration Coupling in Methanol:? Diabatic Behavior in the CH Overtone Region  

Science Journals Connector (OSTI)

The local-mode notation, ?a and ?b, does not apply in the fundamental (vCH = 1) region because the local?local coupling ? splits the three degenerate local CH fundamentals into the normal modes ?3 and {?2, ?9}. ... Support of this work does not constitute endorsement by the DOE of views expressed in this paper. ...

David S. Perry

2007-12-23T23:59:59.000Z

368

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.

369

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

370

(top). The surface second funda-mental form property surface and its  

E-Print Network [OSTI]

). This surface is the same as in plate 2. Plate 11 Teapot trichotomy is degenerated into a ditochomy - no concave and the bottom is not. Plate 13 Teapot curvature estimation using curvature property surface computa- tion. Plate estimate for a surface (same surface as in plate 2). Plate 5 Parametrization speed estimate for the teapot

Utah, University of

371

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

372

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

373

Effective Models and Extension of Torsors Over a Discrete Valuation Ring of Unequal Characteristic  

Science Journals Connector (OSTI)

......preprint arXiv:math/ 0601639v1. 20 Saidi M. Torsors under finite and flat group...Zeitschrift (2003) 245(4):695-710. 21 Saidi M. On the existence of a torsor structure...preprint arXiv:Math/0403389v1. 22 Saidi M. On the degeneration of etale and -torsors......

Dajano Tossici

2008-01-01T23:59:59.000Z

374

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

375

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.

376

Max-Planck-Institut f ur Mathematik  

E-Print Network [OSTI]

­degenerate representations of O(#) are found. They are labeled by the value of the total electric charge, leading . . . . . . . . . . . . . . . . 9 3.2 Generating the observable algebra from the tree data . . . . . 15 3.3 Functional analytic to realistic gauge theories is still a big challenge. Some partial results in this direction already exist, see

377

US–Japan trade talks in trouble  

Science Journals Connector (OSTI)

... THE annual ritual of negotiations between the United States and Japan on trade is in danger of degenerating into farce. Breaking with the past practice ... in with the US president's demands - on this occasion, that fixed proportions of Japan's domestic market for telecommunications and automobile equipment should be filled by imports from the ...

1994-02-17T23:59:59.000Z

378

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

379

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

380

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

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

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

382

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

383

Epidemiology of Blunt Head Trauma in Children in U.S. Emergency Departments  

Science Journals Connector (OSTI)

To the Editor: Traumatic brain injury is the leading cause of death and disabilities in children older than 1 year of age. Detailed data about head trauma in children are needed to better understand the rates and unique age-related risks of injury. We examined the characteristics of children with blunt... Among more than 43,000 children treated in 25 emergency departments for blunt head trauma, traumatic brain injury was identified on CT scan in 7% of the patients. Falls were the most frequent injury mechanism for children under the age of 12 years.

2014-11-13T23:59:59.000Z

384

Effect of $^{12}C+$ $^{12}C$ Reaction & Convective Mixing on the Progenitor Mass of ONe White Dwarfs  

E-Print Network [OSTI]

Stars in the mass range ~8 - 12 $M_{\\odot }$ are the most numerous massive stars. This mass range is critical because it may lead to supernova (SN) explosion, so it is important for the production of heavy elements and the chemical evolution of the galaxy. We investigate the critical transition mass ($M_{up}$), which is the minimum initial stellar mass that attains the conditions for hydrostatic carbon burning. Stars of masses carbon in a partially degenerate CO core and form electron degenerate ONe cores. These stars evolve to the Super AGB (SAGB) phase and either become progenitors of ONe White Dwarfs or eventually explode as electron-capture SN (EC-SN). We study the sensitivity of $M_{up}$ to the C-burning reaction rate and to the treatment of convective mixing. In particular, we show the effect of a recent determination of the $^{12}C+$ $^{12}C$ fusion rate, as well as t...

Halabi, Ghina M

2014-01-01T23:59:59.000Z

385

U(1) gauge field localization on a Bloch brane with Chumbes-Holf da Silva-Hott mechanism  

Science Journals Connector (OSTI)

We follow the Chumbes–Holf da Silva–Hott mechanism to study the (quasi)localization of the U(1) gauge field on the Bloch brane. The localization and resonances of the U(1) gauge field are discussed for four kinds of Bloch brane solutions: the original and generalized Bloch brane solutions, as well as the degenerate Bloch brane solutions I and II. With the Chumbes–Holf da Silva–Hott mechanism, we find that the mass spectrum of the gauge field Kaluza-Klein modes is continuous and there is no tachyonic mode. The zero mode is localized on all the branes and there are resonant Kaluza-Klein modes on the degenerate Bloch branes.

Zhen-Hua Zhao; Yu-Xiao Liu; Yuan Zhong

2014-08-25T23:59:59.000Z

386

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

387

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

388

Pseudo Dirac neutrinos in the seesaw model  

Science Journals Connector (OSTI)

A specific class of textures for the Dirac and Majorana mass matrices in the seesaw model leading to a pair of almost degenerate neutrinos is discussed. These textures can be obtained by imposing a horizontal U(1) symmetry. A specific model is discussed in which (1) all three neutrino masses are similar in magnitude and could lie around 1 eV providing the hot component of the dark matter in the Universe, (2) two of these are highly degenerate and their (mass)2 difference could solve the solar neutrino problem through the large angle MSW solution, and (3) the electron neutrino mass may be observable through a Kurie plot as well as through a search of the neutrinoless double ? decay.

Gautam Dutta and Anjan S. Joshipura

1995-04-01T23:59:59.000Z

389

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

390

Coherence-Preserving Quantum Bits  

Science Journals Connector (OSTI)

Real quantum systems couple to their environment and lose their intrinsic quantum nature through the process known as decoherence. Here we present a method for minimizing decoherence by making it energetically unfavorable. We present a Hamiltonian made up solely of two-body interactions between four two-level systems (qubits) which has a 2-fold degenerate ground state. This degenerate ground state has the property that any decoherence process acting on an individual physical qubit must supply energy from the bath to the system. Quantum information can be encoded into the degeneracy of the ground state and such coherence-preserving qubits will then be robust to local decoherence at low bath temperatures. We show how this quantum information can be universally manipulated and indicate how this approach may be applied to a quantum dot quantum computer.

Dave Bacon; Kenneth R. Brown; K. Birgitta Whaley

2001-11-26T23:59:59.000Z

391

Efficient Spin Injection into Silicon and the Role of the Schottky Barrier  

E-Print Network [OSTI]

Implementing spin functionalities in Si, and understanding the fundamental processes of spin injection and detection, are the main challenges in spintronics. Here we demonstrate large spin polarizations at room temperature, 34% in n-type and 10% in p-type degenerate Si bands, using a narrow Schottky and a SiO2 tunnel barrier in a direct tunneling regime. Furthermore, by increasing the width of the Schottky barrier in non-degenerate p-type Si, we observed a systematic sign reversal of the Hanle signal in the low bias regime. This dramatic change in the spin injection and detection processes with increased Schottky barrier resistance may be due to a decoupling of the spins in the interface states from the bulk band of Si, yielding a transition from a direct to a localized state assisted tunneling. Our study provides a deeper insight into the spin transport phenomenon, which should be considered for electrical spin injection into any semiconductor.

André Dankert; Ravi S. Dulal; Saroj P. Dash

2014-03-12T23:59:59.000Z

392

Remarks about Static Back-Reaction on Black Hole Spacetimes  

E-Print Network [OSTI]

Recently, it has been claimed that the back reaction of vacuum polarization on a black hole spacetime naturally regularizes infinities in the black hole entropy. We examine the back reaction calculation and find no such short-distance cut-off,in contradiction with these recent claims. Moreover, the intuitive expectation that the perturbative calculation breaks down near the event horizon is confirmed. The new surface gravity diverges and the metric is degenerate at the stretched horizon.

Neil J. Cornish; Janna J. Levin

1994-11-13T23:59:59.000Z

393

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

394

Ferromagnetic neutron stars: axial anomaly, dense neutron matter, and pionic wall  

E-Print Network [OSTI]

We show that a chiral nonlinear sigma model coupled to degenerate neutrons exhibits a ferromagnetic phase at high density. The magnetization is due to the axial anomaly acting on the parallel layers of neutral pion domain walls spontaneously formed at high density. The emergent magnetic field would reach the QCD scale ~ 10^19 [G], which suggests that the quantum anomaly can be a microscopic origin of the magnetars (highly magnetized neutron stars).

Minoru Eto; Koji Hashimoto; Tetsuo Hatsuda

2012-09-21T23:59:59.000Z

395

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

396

Stochastic webs and their applications  

Science Journals Connector (OSTI)

The conditions for the appearance of a stochastic web in degenerate dynamic systems and typical physical problems that lead to such a web are analyzed. Examples of webs are considered as well as their symmetry width and structural changes. A description is given of a change in the diffusion dynamics along the web channels as a function of the number of the degrees of freedom and the phenomenon of stochastic percolation is discussed.

George M. Zaslavsky

1991-01-01T23:59:59.000Z

397

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

398

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

399

Surgery for Ischemic Mitral Regurgitation  

Science Journals Connector (OSTI)

...only moderate, however, the question has been whether coronary revascularization alone will suffice or whether intervention on the valve is required. Smith and colleagues now report in the Journal the results of a randomized trial comparing coronary-artery bypass grafting (CABG) alone with CABG plus mitral... Defining the appropriate management of mitral regurgitation secondary to ischemic heart disease — as opposed to primary disease such as rheumatic or myxomatous degeneration — has proved elusive. Coronary artery disease is common, and so is associated ...

Sundt T.M.

2014-12-04T23:59:59.000Z

400

Analysis of the expression and localization of gene products from two Campoletis sonorensis polydnavirus multigene families  

E-Print Network [OSTI]

by Coresia congregata to pathogenic bacteria was attributed to inhibition of nodulation and phagocytosis, but not due to a decrease in the pmduction of antibacterial proteins (Ross and Dunn, 1989). The phagocytic ability of H. virescens parasitized... 4 days of CsPDV injection (Dover et al. , 1988, 1989). Injection of UV inactivated CsPDV failed to induce degeneration of prothoracic glands. Parasitization by Apanteles kariyai inhibits pupation of its host by inhibition of PITH release (Tanaka...

Graham, Brent Lee

2012-06-07T23:59:59.000Z

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

Domain growth in the clock model  

Science Journals Connector (OSTI)

The development of order in the clock (ZN) model is studied following a quench from the disordered phase to a low-temperature unstable state below the ferromagnetic critical point. Growth laws for the average size of domains are obtained by computer simulation for N=3, 4, 8, 16, and 26 degenerate states. In disagreement with recent Monte Carlo work, no pinning by vortices is observed.

Kimmo Kaski; Martin Grant; J. D. Gunton

1985-03-01T23:59:59.000Z

402

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

403

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

404

Local Topological Order Inhibits Thermal Stability in 2D  

Science Journals Connector (OSTI)

We study the robustness of quantum information stored in the degenerate ground space of a local, frustration-free Hamiltonian with commuting terms on a 2D spin lattice. On one hand, a macroscopic energy barrier separating the distinct ground states under local transformations would protect the information from thermal fluctuations. On the other hand, local topological order would shield the ground space from static perturbations. Here we demonstrate that local topological order implies a constant energy barrier, thus inhibiting thermal stability.

Olivier Landon-Cardinal and David Poulin

2013-02-28T23:59:59.000Z

405

Physics of supernovae  

SciTech Connect (OSTI)

Presupernova models of massive stars are presented and their explosion by ''delayed neutrino transport'' examined. A new form of long duration Type II supernova model is also explored based upon repeated encounter with the electron-positron pair instability in stars heavier than about 60 Msub solar. Carbon deflagration in white dwarfs is discussed as the probable explanation of Type I supernovae and special attention is paid to the physical processes whereby a nuclear flame propagates through degenerate carbon. 89 refs., 12 figs.

Woosley, S.E.; Weaver, T.A.

1985-12-13T23:59:59.000Z

406

The First Two Fermion Generations in Twisted Mass Lattice QCD  

SciTech Connect (OSTI)

An account of the status of simulations from the European Twisted Mass Collaboration is given. We show selected results from computations with two mass degenerate quarks, in particular values for the low energy constants of the chiral Lagrangian, the I = 2 scattering length and the {rho}-meson resonance parameters. We also provide first results from simulations where the strange and the charm quarks are included as dynamical degree of freedom in the simulation.

Jansen, Karl [NIC, DESY, Platanenallee 6, 15738 Zeuthen (Germany)

2011-05-24T23:59:59.000Z

407

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

408

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

409

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

410

Rawls and Rousseau on the Social Contract  

E-Print Network [OSTI]

; 2) what they believe is possible for them to achieve given man and his condition; 3) what the contractees see as de­ sirable, the values or rights they wish to promote or preserve. In Rousseau, the purpose of the contract was not the protection... into a veritable state of war. In a corrupt and alienated society "amour de soi" or self-preservation degenerates into "amour- propre" or conceit and vanity. Rousseau believes his social contract reestablishes freedom and compassion by totally...

Grcic, Joseph M.

1985-12-01T23:59:59.000Z

411

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

2010-02-04T23:59:59.000Z

412

CODING AND CHARGING SPECIFICITIES OF sRNA's ISOLATED BY COUNTERCURRENT DISTRIBUTION  

Science Journals Connector (OSTI)

...codons have been suggested:14 15 U2C,1" C2U, U2G, and U3. Weisblum et al."1 have...following redundant or degenerate codons: U2C, C2U, UAC, and AGC.14 15 The idea of a molecular...sRNA's fits a U2C codon-the other, C2U-we have examined serine incorporation...

Thomas Peter Bennett; Jack Goldstein; Fritz Lipmann

1965-01-01T23:59:59.000Z

413

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

414

Soil loss: An overview  

Science Journals Connector (OSTI)

The earth's soil budget is analysed and the causes of loss and degeneration are described. The main efforts to solve the problems of soil los should be concentrated on: 1. (i) the preparation of international guidelines for conservation policy; 2. (ii) declaration of an International Soil Conservation Decade; 3. (iii) acceleration of and support for land assessment; 4. (iv) development of national planning for alternative land uses; 5. (v) research to establish ecologically sound policies for land use and conservation.

V.A. Kovda

1976-01-01T23:59:59.000Z

415

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

416

The axial N to Delta transition form factors from Lattice QCD  

E-Print Network [OSTI]

We evaluate the N to Delta axial transition form factors in lattice QCD in the quenched theory, with two degenerate flavors of dynamical Wilson fermions and using domain wall valence fermions with staggered sea quark configurations. We predict the ratio $C_5^A(q^2)/C_3^V(q^2)$ relevant to the parity violating asymmetry and check the validity of the off-diagonal Goldberger-Treiman relation.

C. Alexandrou; Th. Leontiou; J. W. Negele; A. Tsapalis

2006-07-20T23:59:59.000Z

417

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

418

Spatial Quantum Signatures in Parametric Down-Conversion  

Science Journals Connector (OSTI)

We calculate the normal and time ordered spatial intensity correlation function of the signal field in a degenerate parametric oscillator below threshold, with spherical mirrors. In the far field, it exhibits a two peak structure, and the correlation is maximal between points opposite each other with respect to the axis of the system. This feature provides direct spatial evidence of the twin photon emission, and identifies states of the radiated field with local nonclassical squeezing properties.

I. Marzoli; A. Gatti; L. A. Lugiato

1997-03-17T23:59:59.000Z

419

Stress-induced switching of nonlinear optical properties of linear polymers  

Science Journals Connector (OSTI)

Replacement of every other hydrogen atom in trans-polyacetylene by other atoms, such as fluorine, results in a simple linear polymer with two carbon atoms per unit cell of the polymer chain. In such polymers, dimerization can be induced or destroyed reversibly by the application of a uniaxial stress. As a consequence, the nonlinear optical properties can be switched dramatically between those of dimerized chains, which have degenerate ground states, and nondimerized chains, which have a nondegenerate ground state.

Olle Heinonen

1990-08-15T23:59:59.000Z

420

Linear degeneracy in the semiclassical atom  

Science Journals Connector (OSTI)

If the angular and radial quantum numbers of states with the same binding energy satisfy a linear relation, as is the situation in the Coulomb potential, the spectrum is said to be linearly degenerate. We present a detailed study of the consequences of such linear degeneracy in atomic potentials. One of the results is a new, and more general, derivation of Scott’s correction to the Thomas-Fermi energy.

Berthold-Georg Englert and Julian Schwinger

1985-07-01T23:59:59.000Z

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,
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We encourage you to perform a real-time search of NLEBeta
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421

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

422

Linear and nonlinear electrostatic modes in a strongly coupled quantum plasma  

SciTech Connect (OSTI)

The properties of linear and nonlinear electrostatic waves in a strongly coupled electron-ion quantum plasma are investigated. In this study, the inertialess electrons are degenerate, while non-degenerate inertial ions are strongly correlated. The ion dynamics is governed by the continuity and the generalized viscoelastic momentum equations. The quantum forces associated with the quantum statistical pressure and the quantum recoil effect act on the degenerate electron fluid, whereas strong ion correlation effects are embedded in generalized viscoelastic momentum equation through the viscoelastic relaxation of ion correlations and ion fluid shear viscosities. Hence, the spectra of linear electrostatic modes are significantly affected by the strong ion coupling effect. In the weakly nonlinear limit, due to ion-ion correlations, the quantum plasma supports a dispersive shock wave, the dynamics of which is governed by the Korteweg-de Vries Burgers' equation. For a particular value of the quantum recoil effect, only monotonic shock structure is observed. Possible applications of our investigation are briefly mentioned.

Ghosh, Samiran [Department of Applied Mathematics, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata 700 009 (India); Chakrabarti, Nikhil [Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700 064 (India); Shukla, P. K. [International Center for Advanced Studies in Physical Sciences and Institute for Theoretical Physics, Faculty of Physics and Astronomy, Ruhr University Bochum, D-44780 Bochum, Germany and Department of Mechanical and Aerospace Engineering and Centre for Energy Research, University of California San Diego, La Jolla, California 92093 (United States)

2012-07-15T23:59:59.000Z

423

A Review of Information for Managing Aging in Nuclear Power Plants  

SciTech Connect (OSTI)

Age related degradation effects in safety related systems of nuclear power plants should be managed to prevent safety margins from eroding below the acceptable limits provided in plant design bases. The Nuclear Plant Aging Research (NPAR) Pro- gram, conducted under the auspices of the U.S. Nuclear Regulatory Commission (NRC), Office of Nuclear Regulatory Research, and other related aging management programs are developing technical information on managing aging. The aging management process central to these efforts consists of three key elements: 1) selecting structures, systems, and components (SSCs) in which aging should be controlled; 2) understanding the mechanisms and rates of degradation in these SSCs; and 3) managing degradation through effective inspection, surveillance, condition monitoring, trending, record keeping, mainten- ance, refurbishment, replacement, and adjustments in the operating environment and service conditions. This document concisely reviews and integrates information developed under the NPAR Program and other aging management studies and other available information related to understanding and managing age-related degradation effects and provides specific refer- ences to more comprehensive information on the same subjects.

WC Morgan; JV Livingston

1995-09-01T23:59:59.000Z

424

Elevated COX2 expression and PGE2 production by downregulation of RXR? in senescent macrophages  

SciTech Connect (OSTI)

Highlights: •Downregulation of RXR? in senescent macrophage. •RXR? suppresses NF-?B activity and COX2 expression. •Increased PGE2 production due to downregulation of RXR?. -- Abstract: Increased systemic level of inflammatory cytokines leads to numerous age-related diseases. In senescent macrophages, elevated prostaglandin E2 (PGE2) production contributes to the suppression of T cell function with aging, which increases the susceptibility to infections. However, the regulation of these inflammatory cytokines and PGE2 with aging still remains unclear. We have verified that cyclooxygenase (COX)-2 expression and PGE2 production are higher in LPS-stimulated macrophages from old mice than that from young mice. Downregulation of RXR?, a nuclear receptor that can suppress NF-?B activity, mediates the elevation of COX2 expression and PGE2 production in senescent macrophages. We also have found less induction of ABCA1 and ABCG1 by RXR? agonist in senescent macrophages, which partially accounts for high risk of atherosclerosis in aged population. Systemic treatment with RXR? antagonist HX531 in young mice increases COX2, TNF-?, and IL-6 expression in splenocytes. Our study not only has outlined a mechanism of elevated NF-?B activity and PGE2 production in senescent macrophages, but also provides RXR? as a potential therapeutic target for treating the age-related diseases.

Chen, Huimin, E-mail: huiminchen.jq@gmail.com [Department of Geratology, Liaoning Jinqiu Hospital, Shenyang 110015 (China)] [Department of Geratology, Liaoning Jinqiu Hospital, Shenyang 110015 (China); Ma, Feng [Institute of Immunology, Zhejiang University of Medicine, Hangzhou 310058 (China)] [Institute of Immunology, Zhejiang University of Medicine, Hangzhou 310058 (China); Hu, Xiaona; Jin, Ting; Xiong, Chuhui [Department of Endocrinology and Metabolism, Institute of Endocrinology, Liaoning Provincial Key Laboratory of Endocrine Diseases, The First Affiliated Hospital of China Medical University, Shenyang 110001 (China)] [Department of Endocrinology and Metabolism, Institute of Endocrinology, Liaoning Provincial Key Laboratory of Endocrine Diseases, The First Affiliated Hospital of China Medical University, Shenyang 110001 (China); Teng, Xiaochun, E-mail: tengxiaochun@126.com [Department of Endocrinology and Metabolism, Institute of Endocrinology, Liaoning Provincial Key Laboratory of Endocrine Diseases, The First Affiliated Hospital of China Medical University, Shenyang 110001 (China)] [Department of Endocrinology and Metabolism, Institute of Endocrinology, Liaoning Provincial Key Laboratory of Endocrine Diseases, The First Affiliated Hospital of China Medical University, Shenyang 110001 (China)

2013-10-11T23:59:59.000Z

425

Catching sparks from well-forged neutralinos  

Science Journals Connector (OSTI)

In this paper we present a new search technique for electroweakinos, the superpartners of electroweak gauge and Higgs bosons, based on final states with missing transverse energy, a photon, and a dilepton pair, ?+??+?+ET. Unlike traditional electroweakino searches, which perform best when m?˜2,30?m?˜10,m?˜±?m?˜10>mZ, our search favors nearly degenerate spectra; degenerate electroweakinos typically have a larger branching ratio to photons, and the cut m???mZ effectively removes on shell Z boson backgrounds while retaining the signal. This feature makes our technique optimal for “well-tempered” scenarios, where the dark matter relic abundance is achieved with interelectroweakino splittings of ?20–70??GeV. Additionally, our strategy applies to a wider range of scenarios where the lightest neutralinos are almost degenerate, but only make up a subdominant component of the dark matter—a spectrum we dub well forged. Focusing on bino-Higgsino admixtures, we present optimal cuts and expected efficiencies for several benchmark scenarios. We find bino-Higgsino mixtures with m?˜2,30?190??GeV and m?˜2,30?m?˜10?30??GeV can be uncovered after roughly 600??fb?1 of luminosity at the 14 TeV LHC. Scenarios with lighter states require less data for discovery, while scenarios with heavier states or larger mass splittings are harder to discriminate from the background and require more data. Unlike many searches for supersymmetry, electroweakino searches are one area where the high luminosity of the next LHC run, rather than the increased energy, is crucial for discovery.

Joseph Bramante; Antonio Delgado; Fatemeh Elahi; Adam Martin; Bryan Ostdiek

2014-11-11T23:59:59.000Z

426

Cubic rare-earth compounds: Variants of the three-state Potts model  

Science Journals Connector (OSTI)

In appropriate cubic fields rare-earth ions have sixfold degenerate ground states. When the angular momentum of the rare earth is large, the six levels are characterized by states that are directed along the cube edges. Within these states the angular momentum operators Jx, Jy, and Jz have particularly simple matrix representations. The projection of an isotropic pair coupling between the rare earths onto these sixfold degenerate states leads to an interaction Hamiltonian H=-I??ij??i?j?lilj, where ? takes on the values ± 1 and l the values x, y, and z. This interaction is a variant of the three-state Potts model. We add magnetic and quadrupolar anisotropy field terms to the Hamiltonian and determine the symmetry properties of the phase diagram associated with this model. For nonzero quadrupolar anisotropy fields, the model is shown to have the thermodynamic behavior of an Ising model. However, for zero fields we find a new symmetry appears and in the mean-field approximation the model has tricritical-like exponents. This simple model is able to account for the large specific-heat critical exponent ??=12 which has been observed for holmium antimonide in zero external fields. To the extent that the mean-field approximation is an accurate guide, we predict there are many cubic rare-earth compounds which exhibit tricritical-like behavior in zero field. In addition we find that for pure quadrupole coupling between rare earths in the sixfold degenerate states, the interaction Hamiltonian is exactly the three-state Potts model. In the mean-field approximation this system has a first-order phase transition. However, a small quadrupolar anisotropy field is sufficient to drive the system to a wing critical point. The specific heat has a critical exponent of ?=23 or 1 depending on the path taken to approach this critical point.

D. Kim; Peter M. Levy; L. F. Uffer

1975-08-01T23:59:59.000Z

427

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

428

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

429

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

430

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

431

ALSNews Vol. 345  

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

5 Print 5 Print A Spintronic Semiconductor with Selectable Charge Carriers 278 thumb Researchers found a semiconductor with two properties crucial for spintronics: a large Rashba effect (splitting of degenerate spin states) and ambipolarity (conduction via electrons and holes). Furthermore, it is possible to control whether the charge carriers are electrons or holes by engineering the surface layer. Read more... Contact: Luca Moreschini From Protein Structure to Function: Ring Cycle for Dilating and Constricting the Nuclear Pore 277thumb Nuclear pore complexes (NPCs) serve as gatekeepers between a cell's cytoplasm and its nucleus. Through crystallographic analyses at the ALS, researchers have elucidated the molecular architecture of the NPC transport channel. Read more...

432

ALSNews Vol. 345  

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

5 Print 5 Print A Spintronic Semiconductor with Selectable Charge Carriers 278 thumb Researchers found a semiconductor with two properties crucial for spintronics: a large Rashba effect (splitting of degenerate spin states) and ambipolarity (conduction via electrons and holes). Furthermore, it is possible to control whether the charge carriers are electrons or holes by engineering the surface layer. Read more... Contact: Luca Moreschini From Protein Structure to Function: Ring Cycle for Dilating and Constricting the Nuclear Pore 277thumb Nuclear pore complexes (NPCs) serve as gatekeepers between a cell's cytoplasm and its nucleus. Through crystallographic analyses at the ALS, researchers have elucidated the molecular architecture of the NPC transport channel. Read more...

433

ALSNews Vol. 345  

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

5 Print 5 Print A Spintronic Semiconductor with Selectable Charge Carriers 278 thumb Researchers found a semiconductor with two properties crucial for spintronics: a large Rashba effect (splitting of degenerate spin states) and ambipolarity (conduction via electrons and holes). Furthermore, it is possible to control whether the charge carriers are electrons or holes by engineering the surface layer. Read more... Contact: Luca Moreschini From Protein Structure to Function: Ring Cycle for Dilating and Constricting the Nuclear Pore 277thumb Nuclear pore complexes (NPCs) serve as gatekeepers between a cell's cytoplasm and its nucleus. Through crystallographic analyses at the ALS, researchers have elucidated the molecular architecture of the NPC transport channel. Read more...

434

N-Degeneracy in rack homology and link invariants  

E-Print Network [OSTI]

We consider rack homology for racks with rack rank N>1. For such racks, we prove that N-degenerate chains form a sub-complex of the classical complex defining rack homology. This allows a homology theory analogous to quandle homology for non-quandle racks with finite ranks. If our rack has rack rank N=1 then it is a quandle and the homology theory coincides with the CKJLS homology theory. We use nontrivial cocycles to define invariants of knots and provide examples of calculations for knots up to 8 crossings and links up to 7 crossings.

Elhamdadi, Mohamed

2010-01-01T23:59:59.000Z

435

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

436

The critical temperature of two-dimensional and three-dimensional Ising models  

Science Journals Connector (OSTI)

The critical temperatures of the Ising model can be obtained by considering the elementary cells of the corresponding lattice namely the square lattice in two dimensions and the cube in three dimensions. The configurations in the statistical sum of a cell are divided into nondegenerate and degenerate cases. At the critical temperature of the infinite lattice the contributions of these two groups of configurations are assumed to be equal. This conjecture reproduces the exact Onsager result for two dimensions and the numerical result for the three-dimensional Ising lattices. Although this conjecture is not exact it gives insight into the nature of the transitions.

B. Liu; M. Gitterman

2003-01-01T23:59:59.000Z

437

New Algorithm to Investigate Neural Networks  

E-Print Network [OSTI]

Random cost simulations were introduced as a method to investigate optimization problems in systems with conflicting constraints. Here I study the approach in connection with the training of a feed-forward multilayer perceptron, as used in high energy physics applications. It is suggested to use random cost simulations for generating a set of selected configurations. On each of those final minimization may then be performed by a standard algorithm. For the training example at hand many almost degenerate local minima are thus found. Some effort is spend to discuss whether they lead to equivalent classifications of the data.

Bernd A. Berg

1996-04-01T23:59:59.000Z

438

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

439

Effect of modulation on the onset of convection in a sparsely packed porous layer  

SciTech Connect (OSTI)

The stability of a Boussinesq fluid-saturated horizontal porous layer heated from below is examined when the applied temperature gradient is the sum of a steady component and a time-dependent sinusoidal component. The Brinkman model is employed and only infinitesimal disturbances are considered. A perturbation solution as a function of the applied field is obtained. The critical Rayleigh number is obtained for several cases depending on the frequency of oscillations and it is found that it is possible to advance or delay the onset of convection by thermal modulation of the wall temperature. The Darcy limit and viscous flow limit are obtained as degenerate cases.

Rudraiah, N.; Malashetty, M.S. (Bangalore Univ. (India))

1990-08-01T23:59:59.000Z

440

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

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

Spectral properties of higher order anharmonic oscillators  

E-Print Network [OSTI]

We discuss spectral properties of the self-adjoint operator \\[ -d^2/dt^2 + (t^{k+1}/(k+1)-\\alpha)^2 \\] in $L^2(\\mathbb{R})$ for odd integers $k$. We prove that the minimum over $\\alpha$ of the ground state energy of this operator is attained at a unique point which tends to zero as $k$ tends to infinity. Moreover, we show that the minimum is non-degenerate. These questions arise naturally in the spectral analysis of Schr\\"{o}dinger operators with magnetic field. This extends or clarifies previous results by Pan-Kwek, Helffer-Morame, Aramaki, Helffer-Kordyukov and Helffer.

Helffer, Bernard

2009-01-01T23:59:59.000Z

442

Neutron - Mirror Neutron Oscillations: How Fast Might They Be?  

E-Print Network [OSTI]

We discuss the phenomenological implications of the neutron (n) oscillation into the mirror neutron (n'), a hypothetical particle exactly degenerate in mass with the neutron but sterile to normal matter. We show that the present experimental data allow a maximal n-n' oscillation in vacuum with a characteristic time $\\tau$ much shorter than the neutron lifetime, in fact as small as 1 sec. This phenomenon may manifest in neutron disappearance and regeneration experiments perfectly accessible to present experimental capabilities and may also have interesting astrophysical consequences, in particular for the propagation of ultra high energy cosmic rays.

Zurab Berezhiani; Luis Bento

2005-07-03T23:59:59.000Z

443

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.

Dobrynina, Alexandra A; Raffelt, Georg G

2014-01-01T23:59:59.000Z

444

Incorporation of incompleteness in the k?p perturbation theory  

Science Journals Connector (OSTI)

The k?p perturbation expansion for the energy of a nondegenerate band, familiar from solid-state texts, provides a convenient method for calculating the effective mass of the band in terms of the eigenstates of the system. As such, it would seem particularly useful in fitting the parameters of an empirical tight-binding model. Unfortunately, this expression is incorrect when applied to a model having an incomplete basis. We find that the correct expression may be derived from the usual result if the incompleteness of the basis is properly taken into account. In addition, since degenerate bands are often of interest, we discuss the correct calculation of their curvatures.

Timothy B. Boykin

1995-12-15T23:59:59.000Z

445

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

446

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

447

Dual Models with Global SU(2,2) Symmetry  

Science Journals Connector (OSTI)

The possibility of enlarging the gauge symmetry of the dual resonance models is considered by studying the structure of SU(2,2)- [or SO(4,2)] invariant dual models. n-point functions based on the degenerate representations of SU(2,2) are worked out in detail, and a condition under which these amplitudes are dual is specified. Dual models based on the nondegenerate representations are also discussed. Through a physical interpretation of the characteristics which emerge, a possible connection between the dimension N-1 of the hadronic matter and the gauge-symmetry group SO(N, 2) is pointed out.

Freydoon Mansouri

1973-08-15T23:59:59.000Z

448

p(2×2) versus c(2×2) configurations for one Mn monolayer on Fe(001)  

Science Journals Connector (OSTI)

The spin polarization of a Mn monolayer on Fe(001) and the interfacial magnetic coupling have been investigated using the tight-binding linear muffin-tin orbital method. We have studied five spin configurations for the Mn monolayer and found that the two lowest in energy, namely c(2×2) and p(2×2)? (the up-arrow ? indicates that the magnetization of the Mn layer points in the same direction than the Fe substrate one), are nearly degenerate. These two configurations lead to different interfacial magnetic couplings and mean surface magnetizations. This result sheds some light onto recent contradictory experimental data.

O. Elmouhssine; G. Mora?-umlauttis; C. Demangeat; J. C. Parlebas

1997-03-15T23:59:59.000Z

449

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

450

Energy conditions in f(R, Lm) gravity  

Science Journals Connector (OSTI)

In order to constrain f(R, Lm) gravity from theoretical aspects, its energy conditions are derived in this paper. These energy conditions given by us are quite general and can be degenerated to the well-known energy conditions in general relativity and f(R) theories of gravity with arbitrary coupling, non-minimal coupling and non-coupling between matter and geometry, respectively, as special cases. To exemplify how to use these energy conditions to restrict f(R, Lm) gravity, we consider a special model in the FRW cosmology and give some corresponding results by using astronomical observations.

Jun Wang; Kai Liao

2012-01-01T23:59:59.000Z

451

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

452

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

453

Cryogenic H maser in a strong B field  

Science Journals Connector (OSTI)

We study the spin-exchange frequency shift of the cryogenic hydrogen maser for B?0. A general expression is derived in terms of populations of ground-state hyperfine levels. The coefficients in this expression are calculated in the degenerate-internal-states approximation, as well as to first order in the hyperfine plus Zeeman splitting. Numerical results are compared with rigorous coupled-channel calculations. Some implications are pointed out for the frequency stability of the H maser in a magnetic field.

A. C. Maan; H. T. C. Stoof; B. J. Verhaar

1990-03-01T23:59:59.000Z

454

Flavor S_4 times 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 $S_4 \\times Z_2$. In this model, all the charged leptons and neutrinos are assigned to the $3_\\alpha$ 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. A nearly tri-bimaximal lepton flavor mixing pattern, which is in agreement with the current experimental results, can be accommodated in our model. The neutrino mass spectrum takes the nearly degenerate pattern, and thus can be well tested in the future precise experiments.

He Zhang

2006-12-18T23:59:59.000Z

455

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

456

On fusion kernel in Liouville theory  

E-Print Network [OSTI]

We study fusion kernel for non-degenerate conformal blocks in Liouville theory as a solution to the difference equations originating from the pentagon identity. We suggest an approach to these equations based on 'non-perturbative' series expansion which allows to calculate the fusion kernel iteratively. We also find the exact solutions for the cases when the central charge is $c=1+6(b-b^{-1})^2$ and $b~\\in \\mathbb{N}$. For $c = 1$ our result reproduces the formula, obtained earlier from analytical continuation via Painlev\\'e equation. However, in our case it appears in a significantly simplified form.

Nikita Nemkov

2014-09-11T23:59:59.000Z

457

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

2005-05-20T23:59:59.000Z

458

Quantum Phase Extraction in Isospectral Electronic Nanostructures  

SciTech Connect (OSTI)

Quantum phase is not a direct observable and is usually determined by interferometric methods. We present a method to map complete electron wave functions, including internal quantum phase information, from measured single-state probability densities. We harness the mathematical discovery of drum-like manifolds bearing different shapes but identical resonances, and construct quantum isospectral nanostructures possessing matching electronic structure but divergent physical structure. Quantum measurement (scanning tunneling microscopy) of these 'quantum drums' [degenerate two-dimensional electron states on the Cu(111) surface confined by individually positioned CO molecules] reveals that isospectrality provides an extra topological degree of freedom enabling robust quantum state transplantation and phase extraction.

Moon, Christopher

2010-04-28T23:59:59.000Z

459

Seniority in quantum many-body systems  

SciTech Connect (OSTI)

The use of the seniority quantum number in many-body systems is reviewed. A brief summary is given of its introduction by Racah in the context of atomic spectroscopy. Several extensions of Racah's original idea are discussed: seniority for identical nucleons in a single-j shell, its extension to the case of many, non-degenerate j shells and to systems with neutrons and protons. To illustrate its usefulness to this day, a recent application of seniority is presented in Bose-Einstein condensates of atoms with spin.

Van Isacker, P. [Grand Accelerateur National d'Ions Lourds, CEA/DSM-CNRS/IN2P3 BP 55027, F-14076 Caen Cedex 5 (France)

2010-12-23T23:59:59.000Z

460

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

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,
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461

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

462

Scalar Dark Matter and Cold Stars  

E-Print Network [OSTI]

In a medium composed of scalar particles with non-zero mass, the range of Van-der-Waals-type scalar mediated interactions among nucleons becomes infinite when the medium makes a transition to a Bose-Einstein condensed phase. We explore this phenomenon in an astrophysical context. Namely, we study the effect of a scalar dark matter background on the equilibrium of degenerate stars.In particular we focus on white dwarfs and the changes induced in their masses and in their radii.

J. A. Grifols

2005-05-30T23:59:59.000Z

463

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

464

Nucleon electromagnetic form factors in twisted mass lattice QCD  

SciTech Connect (OSTI)

We present results on the nucleon electromagnetic form factors within lattice QCD using two flavors of degenerate twisted mass fermions. Volume effects are examined using simulations at two volumes of spatial length L=2.1 fm and L=2.8 fm. Cutoff effects are investigated using three different values of the lattice spacings, namely a=0.089 fm, a=0.070 fm and a=0.056 fm. The nucleon magnetic moment, Dirac and Pauli radii are obtained in the continuum limit and chirally extrapolated to the physical pion mass allowing for a comparison with experiment.

Alexandrou, C. [Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia (Cyprus); Computation-based Science and Technology Research Center, Cyprus Institute, 20 Kavafi Str., Nicosia 2121 (Cyprus); Brinet, M.; Carbonell, J.; Harraud, P. A.; Papinutto, M. [Laboratoire de Physique Subatomique et Cosmologie, UJF/CNRS/IN2P3, 53 avenue des Martyrs, 38026 Grenoble (France); Guichon, P. [CEA-Saclay, IRFU/Service de Physique Nucleaire, 91191 Gif-sur-Yvette (France); Jansen, K. [NIC, DESY, Platanenallee 6, D-15738 Zeuthen (Germany); Korzec, T. [Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia (Cyprus); Institut fuer Physik Humboldt Universitaet zu Berlin, Newtonstrasse 15, 12489 Berlin (Germany); Constantinou, M.

2011-05-01T23:59:59.000Z

465

Leading-order hadronic contribution to the anomalous magnetic moment of the muon from N_f=2+1+1 twisted mass fermions  

SciTech Connect (OSTI)

We present results for the leading order QCD correction to the anomalous magnetic moment of the muon including the first two generations of quarks as dynamical degrees of freedom. Several light quark masses are examined in order to yield a controlled extrapolation to the physical pion mass. We analyse ensembles for three different lattice spacings and several volumes in order to investigate lattice artefacts and finite-size effects, respectively. We also provide preliminary results for this quantity for two flavours of mass-degenerate quarks at the physical value of the pion mass.

Burger, Florian [Humboldt U. Berlin; Feng, Xu [KEK; Hotzel, Grit [Humboldt U. Berlin; Jansen, Karl [DESY; Petschlies, Marcus [The Cyprus Institute; Renner, Dru B. [JLAB

2013-11-01T23:59:59.000Z

466

Axial nucleon form factors from lattice QCD  

SciTech Connect (OSTI)

We present results on the nucleon axial form factors within lattice QCD using two flavors of degenerate twisted mass fermions. Volume effects are examined using simulations at two volumes of spatial length L=2.1 fm and L=2.8 fm. Cut-off effects are investigated using three different values of the lattice spacings, namely a=0.089 fm, a=0.070 fm and a=0.056 fm. The nucleon axial charge is obtained in the continuum limit and chirally extrapolated to the physical pion mass enabling comparison with experiment.

Alexandrou, C. [Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia (Cyprus); Computation-based Science and Technology Research Center, Cyprus Institute, 20 Kavafi Str., Nicosia 2121 (Cyprus); Brinet, M.; Carbonell, J.; Harraud, P. A.; Papinutto, M. [Laboratoire de Physique Subatomique et Cosmologie, UJF/CNRS/IN2P3, 53 avenue des Martyrs, 38026 Grenoble (France); Constantinou, M. [Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia (Cyprus); Guichon, P. [CEA-Saclay, IRFU/Service de Physique Nucleaire, 91191 Gif-sur-Yvette (France); Jansen, K. [NIC, DESY, Platanenallee 6, D-15738 Zeuthen (Germany); Korzec, T. [Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia (Cyprus); Institut fuer Physik Humboldt Universitaet zu Berlin, Newtonstrasse 15, 12489 Berlin (Germany)

2011-02-15T23:59:59.000Z

467

Topology Change and the Propagation of Massless Fields  

E-Print Network [OSTI]

We analyse the massless wave equation on a class of two dimensional manifolds consisting of an arbitrary number of topological cylinders connected to one or more topological spheres. Such manifolds are endowed with a degenerate (non-globally hyperbolic) metric. Attention is drawn to the topological constraints on solutions describing monochromatic modes on both compact and non-compact manifolds. Energy and momentum currents are constructed and a new global sum rule discussed. The results offer a rigorous background for the formulation of a field theory of topologically induced particle production.

Jonathan Gratus; Robin W Tucker

1995-02-07T23:59:59.000Z

468

Leading-order hadronic contribution to the anomalous magnetic moment of the muon from N_f=2+1+1 twisted mass fermions  

E-Print Network [OSTI]

We present results for the leading order QCD correction to the anomalous magnetic moment of the muon including the first two generations of quarks as dynamical degrees of freedom. Several light quark masses are examined in order to yield a controlled extrapolation to the physical pion mass. We analyse ensembles for three different lattice spacings and several volumes in order to investigate lattice artefacts and finite-size effects, respectively. We also provide preliminary results for this quantity for two flavours of mass-degenerate quarks at the physical value of the pion mass.

Florian Burger; Xu Feng; Grit Hotzel; Karl Jansen; Marcus Petschlies; Dru B. Renner

2013-11-15T23:59:59.000Z

469

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

470

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

2014-10-29T23:59:59.000Z

471

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

472

Correlation between \\{Y2BaCuO5\\} (211) phase and superconducting magnetic properties in Ag-doped melt textured growth (MTG) YBa2Cu3O7?x superconductors  

Science Journals Connector (OSTI)

Samples of YBa2Cu3O7?x with different amount of Ag addition were prepared by the melt textured growth (MTG) process. The hysteresis and irreversible behaviour have been examined. It is found that the critical current density Jc is reduced and the irreversibility line is degenerated by doping Ag into YBa2Cu3O7?x. The microstructure analyses reveal that the volume fraction of \\{Y2BaCuO5\\} (211 Phase) decreases with increasing Ag concentration. This indicates that Ag doping can not intrinsically improve the Jc of YBa2Cu3O7?x superconductors.

J.A. Xia; H.T. Ren; Y. Zhao; C. Andrikidis; H.K. Liu; S.X. Dou

1994-01-01T23:59:59.000Z

473

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

474

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

475

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

476

Quantum Approach to a Derivation of the Second Law of Thermodynamics  

Science Journals Connector (OSTI)

We reinterpret the microcanonical conditions in the quantum domain as constraints for the interaction of the “gas subsystem” under consideration and its environment (“container”). The time average of a purity measure is found to equal the average over the respective path in Hilbert space. We then show that for typical (degenerate or nondegenerate) thermodynamical systems almost all states within the allowed region of Hilbert space have a local von Neumann entropy S close to the maximum and a purity P close to its minimum, respectively. Typically, thermodynamical systems should obey the second law.

Jochen Gemmer; Alexander Otte; Günter Mahler

2001-03-05T23:59:59.000Z

477

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

478

Supersymmetry and non-Abelian geometric phase for a free particle on a circle with point-like interactions  

E-Print Network [OSTI]

Though not so widely appreciated in the literature, supersymmetric quantum mechanics provides an ideal playground for studying non-Abelian geometric phase, because supersymmetry always guarantees degeneracies in energy levels. In this paper we first present a simple supersymmetric model for a free particle on a circle with point-like interactions that exhibits $\\mathscr{N} = 2$ supersymmetry and doubly degenerate energy levels. We then show that Berry's connection in this model is given by the Wu-Yang-like magnetic monopole in SU(2) Yang-Mills gauge theory. This article is largely based on our recent work [arXiv:1406.4857].

Satoshi Ohya

2014-09-29T23:59:59.000Z

479

Supersymmetry and non-Abelian geometric phase for a free particle on a circle with point-like interactions  

E-Print Network [OSTI]

Though not so widely appreciated in the literature, supersymmetric quantum mechanics provides an ideal playground for studying non-Abelian geometric phase, because supersymmetry always guarantees degeneracies in energy levels. In this paper we first present a simple supersymmetric model for a free particle on a circle with point-like interactions that exhibits $\\mathscr{N} = 2$ supersymmetry and doubly degenerate energy levels. We then show that Berry's connection in this model is given by the Wu-Yang-like magnetic monopole in SU(2) Yang-Mills gauge theory. This article is largely based on our recent work [arXiv:1406.4857].

Ohya, Satoshi

2014-01-01T23:59:59.000Z

480

Photocurrent-induced changes in the excitonic photoluminescence from a single heterojunction quantum well  

Science Journals Connector (OSTI)

Excitons which coexist with a degenerate two-dimensional electron gas (2DEG) in the same quantum well subband have been observed in the photoluminescence (PL) from the recombination of electrons with localized photoexcited holes. Under pulsed photoexcitation at a critical applied voltage, the screening response of the 2DEG/exciton system to the appearance of a remote photocurrent filament in the 2DEG induces an increase in the integrated PL intensity, the formation of long-lifetime excitons in the excitation region, and long-lifetime redshifted PL from the excitation region and the region around the filament.

Patrick A. Folkes and Yingmei Liu

2008-11-06T23:59:59.000Z

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

Electrical conductivity of warm dense tungsten  

Science Journals Connector (OSTI)

Abstract The electrical conductivity of warm dense tungsten plasma has been investigated successfully by a linear mixture rule considering various interactions of electrons with electrons, atoms, and ions. The plasma composition is calculated by the nonideal Saha equation. The interesting regime for tungsten plasma spans from weakly coupled and nondegenerate regime to strongly coupled and partial degenerate state. The electrical conductivity calculated is in reasonable agreement with the exploding wire experiments and other theoretical models. The present result demonstrates that the theoretical model is valid for the electrical conductivity of tungsten plasma in the warm dense matter regime.

Zhijian Fu; Lijun Jia; Xiaowei Sun; Qifeng Chen

2013-01-01T23:59:59.000Z

482

Role of the Z*'s in a Theory of Clashing Internal Symmetries  

Science Journals Connector (OSTI)

The role of the Z*'s is discussed on the basis that the badly broken nonchiral SU(2)×SU(2) internal symmetry is also relevant for the classification of hadronic states, complementing the well-established broken SU(3) symmetry. If we assume that the Z*'s belong to (½,½) representation of SU(2)×SU(2), we can expect one or more sets of Z0* and Z1*. Each (Z0*,Z1*) set is nearly mass degenerate and has the same spin and parity.

S. F. Tuan

1970-08-01T23:59:59.000Z

483

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

484

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

485

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

486

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

487

ALSNews Vol. 345  

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

5 Print 5 Print A Spintronic Semiconductor with Selectable Charge Carriers 278 thumb Researchers found a semiconductor with two properties crucial for spintronics: a large Rashba effect (splitting of degenerate spin states) and ambipolarity (conduction via electrons and holes). Furthermore, it is possible to control whether the charge carriers are electrons or holes by engineering the surface layer. Read more... Contact: Luca Moreschini From Protein Structure to Function: Ring Cycle for Dilating and Constricting the Nuclear Pore 277thumb Nuclear pore complexes (NPCs) serve as gatekeepers between a cell's cytoplasm and its nucleus. Through crystallographic analyses at the ALS, researchers have elucidated the molecular architecture of the NPC transport channel. Read more...

488

Does a 5/2+-5/2- ground-state parity doublet exist in ?229  

Science Journals Connector (OSTI)

The 1/2[530] decoupled band in Pa229 has been identified up to the 19/2- level in (p,t) and (p,2n?) experiments. It is found that the 3/2- band head has an excitation energy of 19(10) keV, and can thus not be identified with a 123 keV level observed in the U229 electron capture decay. This removes the evidence presented earlier for a spin-parity assignment of 5/2+-5/2- to a proposed nearly degenerate ground-state doublet in Pa229.

V. Grafen; B. Ackermann; H. Baltzer; T. Bihn; C. Günther; J. deBoer; N. Gollwitzer; G. Graw; R. Hertenberger; H. Kader; A. Levon; A. Lösch

1991-11-01T23:59:59.000Z

489

Neutrino Oscillations from String Theory  

E-Print Network [OSTI]

We derive the character of neutrino oscillations that results from a model of equivalence principle violation suggested recently by Damour and Polyakov as a plausible consequence of string theory. In this model neutrino oscillations will take place through interaction with a long range scalar field of gravitational origin even if the neutrinos are degenerate in mass. The energy dependence of the oscillation length is identical to that in the conventional mass mixing mechanism. This possibility further highlghts the independence of and need for more exacting direct neutrino mass measurements together with a next generation of neutrinoless double beta decay experiments.

A. Halprin; C. N. Leung

1997-07-21T23:59:59.000Z

490

Baryon resonances coupled to Pion-Nucleon states in lattice QCD  

E-Print Network [OSTI]

In recent years the study of two particle systems on the lattice has led to excellent results in the meson sector of the QCD spectrum, however baryon resonances mostly remain unexplored. We present a study of pion-nucleon systems as decay product of baryon resonances in different channels, with special focus on the nucleon spectrum. We evaluate the correlation functions of single and multi particle interpolators. All the Wick contributions are explicitly computed and the consequences of reduced symmetries in moving frames are taken into account. We discuss the theoretical setup together with results for $n_f=2$ mass degenerate light quarks.

Verduci, Valentina

2014-01-01T23:59:59.000Z

491

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

492

Dog Teeth and Hearing  

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

Dog Teeth and Hearing Dog Teeth and Hearing Name: Chad Status: other Grade: 9-12 Location: Outside U.S. Country: Canada Date: Spring 2011 Question: Can a bad tooth problem, infection (we've had several teeth pulled) cause a problem with deafness in a dog ? We have a snoodle 14 years old, but still in other wise good health. Replies: Hi Chad, Sorry to hear about Snoodle's hearing and dental problems. Deafness in an older dog is not uncommon and it would not likely be due to any tooth related problems. A severe tooth infection that extends or penetrates through the bone into the ear canal would be very rare and you would see very obvious symptoms in the ear. If your vet has examined Snoodle and there were no obvious problems related to the ear canal, then I would attribute the hearing loss to an age related change. I hope this helps.

493

Weapons testing data determines brain makes new neurons into adulthood  

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

4 4 For immediate release: 06/10/2013 | NR-13-06-04 Weapons testing data determines brain makes new neurons into adulthood Anne M Stark, LLNL, (925) 422-9799, stark8@llnl.gov Image courtesy of National Institutes of Health. LIVERMORE, Calif. -- Using data derived from nuclear weapons testing of the 1950s and '60s, Lawrence Livermore scientists have found that a small portion of the human brain involved in memory makes new neurons well into adulthood. The research may have profound impacts on human behavior and mental health. The study supports the importance of investigating the therapeutic potential of applying adult neurogenesis to the treatment of age-related cognitive disorders. Neurogenesis is the process by which neurons are generated from neural stem

494

Structural Basis of Pre-existing Immunity to the 2009 H1N1 Pandemic  

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

Structural Basis of Pre-existing Immunity to the 2009 Structural Basis of Pre-existing Immunity to the 2009 H1N1 Pandemic Influenza Virus The emergence of the 2009 H1N1 influenza pandemic, also known as the "swine flu", marks the first human flu pandemic in 40 years and has caused significant human infection and mortality globally (1). The emergence of the 2009 H1N1 flu marks the first time that an influenza pandemic was triggered by a virus carrying the same hemagglutinin (HA) subtype as circulating seasonal strains. In contrast, all prior pandemics were caused by the rise of a novel influenza strain with a different hemagglutinin subtype. And unlike seasonal flu that usually affects the elderly most severely, swine flu has been primarily targeting people under the age of 65, implying some age-related pre-existing immunity (2, 3).

495

Photochemical Studies on Xanthurenic Acid  

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

Photochemical Studies on Xanthurenic Acid Photochemical Studies on Xanthurenic Acid J. E. Roberts, J. F. Wishart, L. Martinez, C. F. Chignell Photochem.Photobiol. 72, 467-471 (2000) Abstract: The tryptophan metabolite xanthurenic acid has been isolated from aged human cataractous lenses. The photophysical properties of xanthurenic acid were examined to determine if it is a potential chromophore for age-related cataractogenesis. We found that xanthurenic acid produces singlet oxygen (F*= 0.17; CD3OD) with the same efficiency as the lenticular chromophore N-formyl kynurenine and quenches singlet oxygen at a rate similar to other tryptophan metabolites (2.1 x 107 M-1 s-1; CD3OD) found in the eye. As the mechanisms of induction of cataracts may also involve redox reactions, the interactions of hydrated electrons (e-aq), the azide radical

496

NRC Research Program on Plant Aging: Listing and summaries of reports issued through September 1993. Revision 4  

SciTech Connect (OSTI)

The US Nuclear Regulatory Commission is conducting the Nuclear Plant Aging Research (NPAR) Program. This is a comprehensive hardware-oriented engineering research program focused on understanding the aging mechanisms of components and systems in nuclear power plants. The NPAR program also focuses on methods for simulating and monitoring the aging-related degradation of these components and systems. In addition, it provides recommendations for effective maintenance to manage aging and for implementation of the research results in the regulatory process. This document contains a listing and index of reports generated in the NPAR Program that were issued through September 1993 and summaries of those reports. Each summary describes the elements of the research covered in the report and outlines the significant results. For the convenience of the user, the reports are indexed by personal author, corporate author, and subject.

Vora, J.P.

1993-12-01T23:59:59.000Z

497

Aging Management Guideline for commercial nuclear power plants: Power and distribution transformers  

SciTech Connect (OSTI)

This Aging Management Guideline (AMG) provides recommended methods for effective detection and mitigation of age-related degradation mechanisms in power and distribution transformers important to license renewal in commercial nuclear power plants. The intent of this AMG 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 Part 54. This AMG is presented in a manner which 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.

Toman, G.; Gazdzinski, R. [Sandia National Labs., Albuquerque, NM (United States)

1994-05-01T23:59:59.000Z

498

Research and Development Roadmaps for Nondestructive Evaluation of Cables, Concrete, Reactor Pressure Vessels, and Piping Fatigue  

SciTech Connect (OSTI)

The purpose of the Materials Aging and Degradation Pathway is to develop the scientific basis for understanding and predicting long-term environmental degradation behavior of materials in nuclear power plants and to provide data and methods to assess the performance of systems, structures, and components essential to safe and sustained nuclear power plant operations. The understanding of aging-related phenomena and their impacts on systems, structures, and components is expected to be a significant issue for any nuclear power plant planning for long-term operations (i.e., service beyond the initial license renewal period). Management of those phenomena and their impacts during long-term operations can be better enabled by improved methods and techniques for detection, monitoring, and prediction of systems, structures, and components degradation.

Clayton, Dwight A.; Bakhtiari, Sasan; Smith, Cyrus M.; Simmons, Kevin L.; Ramuhalli, Pradeep; Coble, Jamie B.; Brenchley, David L.; Meyer, Ryan M.

2013-04-16T23:59:59.000Z

499

Elevated gray matter volume of the emotional cerebellum in women with premenstrual dysphoric disorder  

Science Journals Connector (OSTI)

Objective Premenstrual dysphoric disorder (PMDD) is characterized by severe, negative mood symptoms during the luteal phase of each menstrual cycle. We recently reported that women with PMDD show a greater increase in relative glucose metabolism in the posterior cerebellum from the follicular to the luteal phase, as compared with healthy women, and that the phase-related increase is proportional to PMDD symptom severity. We extended this work with a study of brain structure in PMDD. Methods High-resolution magnetic resonance imaging (MRI) scans were obtained from 12 women with PMDD and 13 healthy control subjects (whole-brain volume-corrected p.1). Conclusions PMDD appears to be associated with reduced age-related loss in posterior cerebellar GMV. Although the mechanism underlying this finding is unclear, cumulative effects of symptom-related cerebellar activity may be involved.

Steven M. Berman; Edythe D. London; Melinda Morgan; Andrea J. Rapkin

2013-01-01T23:59:59.000Z

500

Aging management guideline for commercial nuclear power plants-pumps  

SciTech Connect (OSTI)

This Aging Management Guideline (AMG) describes recommended methods for effective detection and mitigation of age-related degradation mechanisms in BWR and PWR commercial nuclear power plant pumps 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 Part 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.; Katz, D.; Daavettila, N.; Lehnert, D. [MDC-Ogden Environmental and Energy Services, Southfield, MI (United States)

1994-03-01T23:59:59.000Z