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Note: This page contains sample records for the topic "microscale lens array" 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
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1

LENS  

NLE Websites -- All DOE Office Websites (Extended Search)

Engineered Net Shaping Engineered Net Shaping Manufacturing Technologies Sandia National Laboratories has developed a new technology to fabricate three-dimensional metallic components directly from CAD solid models. This process, called Laser Engineered Net Shaping (LENS ® ), exhibits enormous potential to revolutionize the way in which metal parts, such as complex proto- types, tooling, and small-lot production items, are pro- duced. The process fabricates metal parts directly from the Computer Aided Design (CAD) solid models using a metal powder injected into a molten pool created by a focused, high-powered laser beam. Simultaneously, the substrate on which the deposition is occurring is scanned under the beam/powder inter- action zone to fabricate the desired cross-sectional geometry. Consecutive layers are sequentially deposit-

2

Self-organized Nano-lens Arrays by Intensified Dewetting of Electron Beam Modified Polymer Thin-films  

E-Print Network (OSTI)

Sub-100 nm polymeric spherical plano-convex nano-lens arrays are fabricated using short electron beam exposures to selectively modify the ultrathin (nano-lenses. The intensified self-organized dewetting under a water-organic solvent mixture overcomes the limitations on surface tension and dewetting force and thus facilitates the formation of sub-100 nm diameter polymer nanolenses of tunable curvature. By varying the extent of e-beam exposure, various configurations from isolated to connected nano-lens arrays can be fabricated.

Ankur Verma; Ashutosh Sharma

2011-09-18T23:59:59.000Z

3

Modelling microscale fuel cells.  

E-Print Network (OSTI)

??The focus of this work is to investigate transport phenomena in recently developed microscale fuel cell designs using computational fluid dynamics (CFD). Two microscale fuel… (more)

Bazylak, Aimy Ming Jii

2009-01-01T23:59:59.000Z

4

EMSL - micro-scales  

NLE Websites -- All DOE Office Websites (Extended Search)

micro-scales en Physical Properties of Ambient and Laboratory-Generated Secondary Organic Aerosol. http:www.emsl.pnl.govemslwebpublicationsphysical-properties-ambient-and-labo...

5

Plasmonic nano lens for nano-imaging  

Science Journals Connector (OSTI)

Plamonic nanolens is a suggestion of unconventional imaging lens, which, instead of glass, is made of stacked arrays of silver nanorods. It is capable of producing colored and...

Kawata, Satoshi

6

Nanospherical-lens lithographical Ag nanodisk arrays embedded in p-GaN for localized surface plasmon-enhanced blue light emitting diodes  

SciTech Connect

Large-scale Ag nanodisks (NDs) arrays fabricated using nanospherical-lens lithography (NLL) are embedded in p-GaN layer of an InGaN/GaN light-emitting diode (LED) for generating localized surface plasmon (LSP) coupling with the radiating dipoles in the quantum-well (QWs). Based on the Ag NDs with the controlled surface coverage, LSP leads to the improved crystalline quality of regrowth p-GaN, increased photoluminescence (PL) intensity, reduced PL decay time, and enhanced output power of LED. Compared with the LED without Ag NDs, the optical output power at a current of 350 mA of the LSP-enhanced LEDs with Ag NDs having a distance of 20 and 35 nm to QWs is increased by 26.7% and 31.1%, respectively. The electrical characteristics and optical properties of LEDs with embedded Ag NPs are dependent on the distance of between Ag NPs and QWs region. The LED with Ag NDs array structure is also found to exhibit reduced emission divergence, compared to that without Ag NDs.

Wei, Tongbo, E-mail: tbwei@semi.ac.cn; Wu, Kui; Sun, Bo; Zhang, Yonghui; Chen, Yu; Huo, Ziqiang; Hu, Qiang; Wang, Junxi; Zeng, Yiping; Li, Jinmin [State Key Laboratory of Solid-State Lighting, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083 (China); Lan, Ding [National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100080 (China)

2014-06-15T23:59:59.000Z

7

High-efficiency thin and compact concentrator photovoltaics using micro-solar cells with via-holes sandwiched between thin lens-array and circuit board  

Science Journals Connector (OSTI)

We have developed a compact concentrator photovoltaic (CPV) module that comprises micro-solar cells with an area of ?0.6 ? 0.6 mm2 sandwiched between a 20-mm-thick lens array and a 1-mm-thick circuit board with no air gap. To establish electrical connections between the circuit board and the micro-solar cells, we developed a micro-solar cell with positive and negative electrodes on the lower face of the cell. In this study, we demonstrated the photovoltaic performance of the micro-solar cell closely approaches that of the standard solar cell measuring ?5 ? 5 mm2 commonly used in conventional CPVs under concentrated illumination. Our study showed that the negative effect on PV performance of perimeter carrier recombination in the micro-solar cell was insignificant under concentrated illumination. Finally, we assembled our micro-solar cells into a CPV module and achieved the module energy conversion efficiency of 34.7% under outdoor solar illumination.

Akihiro Itou; Tetsuya Asano; Daijiro Inoue; Hidekazu Arase; Akio Matsushita; Nobuhiko Hayashi; Ryutaro Futakuchi; Kazuo Inoue; Masaki Yamamoto; Eiji Fujii; Tohru Nakagawa; Yoshiharu Anda; Hidetoshi Ishida; Tetsuzo Ueda; Onur Fidaner; Michael Wiemer; Daisuke Ueda

2014-01-01T23:59:59.000Z

8

Microoptical compound lens  

DOE Patents (OSTI)

An apposition microoptical compound lens comprises a plurality of lenslets arrayed around a segment of a hollow, three-dimensional optical shell. The lenslets collect light from an object and focus the light rays onto the concentric, curved front surface of a coherent fiber bundle. The fiber bundle transports the light rays to a planar detector, forming a plurality of sub-images that can be reconstructed as a full image. The microoptical compound lens can have a small size (millimeters), wide field of view (up to 180.degree.), and adequate resolution for object recognition and tracking.

Sweatt, William C. (Albuquerque, NM); Gill, David D. (Albuquerque, NM)

2007-10-23T23:59:59.000Z

9

Comments on "Microscale flow visualization"  

E-Print Network (OSTI)

We make comments on the presentation of Sinton's paper (Microfluidics and Nanofluidics {\\bf 1}: 2, 2004) about the microscale flow visualization since the effects of the roughness along the microfabricated wall upon the current macroflow visualization methods could be significant and cannot be neglected in microdomain and even nanodomain.

A. Kwang-Hua Chu

2005-10-22T23:59:59.000Z

10

Compound lens  

DOE Patents (OSTI)

The disclosure relates to at least one calcium fluoride optical element used in combination with at least two ordinary crown glass lens elements to greatly reduce secondary spectrum in optical systems.

Brixner, B.B.; Klein, M.M.; Winkler, M.A.

1980-05-21T23:59:59.000Z

11

Microscale Electrode Design Using Coupled Kinetic, Thermal and...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Microscale Electrode Design Using Coupled Kinetic, Thermal and Mechanical Modeling Microscale Electrode Design Using Coupled Kinetic, Thermal and Mechanical Modeling 2010 DOE...

12

Microscale Electrode Design Using Coupled Kinetic, Thermal and...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Microscale Electrode Design Using Coupled Kinetic, Thermal and Mechanical Modeling Microscale Electrode Design Using Coupled Kinetic, Thermal and Mechanical Modeling 2009 DOE...

13

Multipoint photonic doppler velocimetry using optical lens elements  

SciTech Connect

A probe including a fisheye lens is disclosed to measure the velocity distribution of a moving surface along many lines of sight. Laser light, directed to the surface and then reflected back from the surface, is Doppler shifted by the moving surface, collected into fisheye lens, and then directed to detection equipment through optic fibers. The received light is mixed with reference laser light and using photonic Doppler velocimetry, a continuous time record of the surface movement is obtained. An array of single-mode optical fibers provides an optic signal to an index-matching lens and eventually to a fisheye lens. The fiber array flat polished and coupled to the index-matching lens using index-matching gel. Numerous fibers in a fiber array project numerous rays through the fisheye lens which in turn project many measurement points at numerous different locations to establish surface coverage over a hemispherical shape with very little crosstalk.

Frogget, Brent Copely; Romero, Vincent Todd

2014-04-29T23:59:59.000Z

14

Nonimaging Fresnel Lens Design  

Science Journals Connector (OSTI)

A Fresnel lens is essentially a chain of prisms. Each prism represents the slope of the lens surface, but without the material of the full body of the conventional singlet. The imaging Fresnel lens refracts li...

Dr. Ralf Leutz; Dr. Akio Suzuki

2001-01-01T23:59:59.000Z

15

Photopolymerization in Microfluidic Gradient Generators: Microscale  

E-Print Network (OSTI)

-compliance profiles that are tunable on the micro- scale. The most straightforward way to create substrates with vari through the development of microfluidic networks,[7,8] with which one can easily generate solution (e microscale gradients with microfluidic networks, and a recent study that demon- strated

16

Microscale Location, Characterization, and Association of  

E-Print Network (OSTI)

and spectroscopic techniques were employed to provide direct information at the microscale on the sequestration microspectroscopy was used for organic carbon measurement, and scanning electron microscopy with wavelengthPAHandotherhydrophobicorganic compound (HOC) sequestration and aging in soils and sediments and the resulting effect on chemical

Zare, Richard N.

17

Microscale autonomous sensor and communications module  

DOE Patents (OSTI)

Various technologies pertaining to a microscale autonomous sensor and communications module are described herein. Such a module includes a sensor that generates a sensor signal that is indicative of an environmental parameter. An integrated circuit receives the sensor signal and generates an output signal based at least in part upon the sensor signal. An optical emitter receives the output signal and generates an optical signal as a function of the output signal. An energy storage device is configured to provide power to at least the integrated circuit and the optical emitter, and wherein the module has a relatively small diameter and thickness.

Okandan, Murat; Nielson, Gregory N

2014-03-25T23:59:59.000Z

18

A Copper Crystal Lens for Ultra-High-Sensitivity Medical Imaging  

NLE Websites -- All DOE Office Websites (Extended Search)

A Copper Crystal Lens for Ultra-High-Sensitivity Medical Imaging A Copper Crystal Lens for Ultra-High-Sensitivity Medical Imaging A copper crystal lens developed at the Advanced Photon Source represents a new and promising approach in nuclear medicine for imaging very small tumors in the human body with higher sensitivity and higher spatial resolution than the cameras now in use. Conceptual view of the 6-lens array system. This system would provide sufficient data to generate a 3-dimensional image of a tumor. Conceptual view of the 6-lens array system. This system would provide sufficient data to generate a 3-dimensional image of a tumor. The lens is designed to focus gamma-ray energies of 100 to 200 keV, which makes it ideal for focusing the 140.6-keV gamma rays from Technetium-99m typically used in radioactive tracers. This new approach to medical imaging

19

Intraocular lens fabrication  

DOE Patents (OSTI)

This invention describes a method for fabricating an intraocular lens made from clear Teflon{trademark}, Mylar{trademark}, or other thermoplastic material having a thickness of about 0.025 millimeters. These plastic materials are thermoformable and biocompatable with the human eye. The two shaped lenses are bonded together with a variety of procedures which may include thermosetting and solvent based adhesives, laser and impulse welding, and ultrasonic bonding. The fill tube, which is used to inject a refractive filling material is formed with the lens so as not to damage the lens shape. A hypodermic tube may be included inside the fill tube. 13 figs.

Salazar, M.A.; Foreman, L.R.

1997-07-08T23:59:59.000Z

20

Intraocular lens fabrication  

DOE Patents (OSTI)

This invention describes a method for fabricating an intraocular lens made rom clear Teflon.TM., Mylar.TM., or other thermoplastic material having a thickness of about 0.025 millimeters. These plastic materials are thermoformable and biocompatable with the human eye. The two shaped lenses are bonded together with a variety of procedures which may include thermosetting and solvent based adhesives, laser and impulse welding, and ultrasonic bonding. The fill tube, which is used to inject a refractive filling material is formed with the lens so as not to damage the lens shape. A hypodermic tube may be included inside the fill tube.

Salazar, Mike A. (Albuquerque, NM); Foreman, Larry R. (Los Alamos, NM)

1997-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

JGI - Len Pennacchio  

NLE Websites -- All DOE Office Websites (Extended Search)

Len Pennacchio Len Pennacchio Len Pennacchio Len Pennacchio, Ph.D Deputy of Genomic Technologies, DOE Joint Genome Institute & Senior Staff Scientist, Genomic Division, Lawrence Berkeley National Laboratory Education BA in Biology, Sonoma State University; PhD in Genetics, Stanford University, Stanford, CA; Postdoctoral training, Lawrence Berkeley National Laboratory, Berkeley, CA. Awards and Honors Co-Organizer, "Advances in Genome Biology & Technology." Marco Island, FL.; Board of Directors, G Corp.; Scientific Advisory Committee Chair for the Genome Canada and the Canadian Institutes of Health Research (CIHR) Initiative for Advancing Technology Innovation through Discovery; Scientific Advisory Boards: 1) Scientific Advisor to the NHGRI Sequencing Program (2011-); 2) Ontario Institute for Cancer Research (OICR); 3) NIH

22

Ethylene Feedstock Characterization by Microscale Pyrolysis/Gas Chromatography  

Science Journals Connector (OSTI)

......January 1978 research-article Articles Ethylene Feedstock Characterization by Microscale...for evaluating naphtha feedstocks for ethylene production and for predicting yields...chromatography and commercial crackers ethylene yields. Ethylene Feedstock Characterization......

M. Greco

1978-01-01T23:59:59.000Z

23

Influence of Microscale Turbulent Droplet Clustering on Radar Cloud Observations  

Science Journals Connector (OSTI)

This study investigates the influence of microscale turbulent clustering of cloud droplets on the radar reflectivity factor and proposes a new parameterization to account for it. A three-dimensional direct numerical simulation of particle-laden ...

Keigo Matsuda; Ryo Onishi; Masaaki Hirahara; Ryoichi Kurose; Keiko Takahashi; Satoru Komori

2014-10-01T23:59:59.000Z

24

Complications of Refractive Lens Exchange  

Science Journals Connector (OSTI)

This chapter approaches retinal complications, in particular retinal detachment after lens surgery in high-myopic patients. ...

José Ma Ruiz-Moreno M.D.; Ph.D.…

2008-01-01T23:59:59.000Z

25

THE OPTIMAL GRAVITATIONAL LENS TELESCOPE  

SciTech Connect

Given an observed gravitational lens mirage produced by a foreground deflector (cf. galaxy, quasar, cluster, ...), it is possible via numerical lens inversion to retrieve the real source image, taking full advantage of the magnifying power of the cosmic lens. This has been achieved in the past for several remarkable gravitational lens systems. Instead, we propose here to invert an observed multiply imaged source directly at the telescope using an ad hoc optical instrument which is described in the present paper. Compared to the previous method, this should allow one to detect fainter source features as well as to use such an optimal gravitational lens telescope to explore even fainter objects located behind and near the lens. Laboratory and numerical experiments illustrate this new approach.

Surdej, J.; Hanot, C.; Sadibekova, T. [Department of Astrophysics, Geophysics and Oceanography (AGO), AEOS Group, Liege University, Allee du 6 Aout 17, 4000 Liege (Belgium); Delacroix, C.; Habraken, S. [Department of Physics (DEPHY), Hololab Group, Liege University, Allee du 6 Aout 17, 4000 Liege (Belgium); Coleman, P. [Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States); Dominik, M. [SUPA, University of St Andrews, School of Physics and Astronomy, North Haugh, St Andrews, KY16 9SS (United Kingdom); Le Coroller, H. [Observatoire de Haute Provence, F-04870 Saint Michel l'Observatoire (France); Mawet, D. [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States); Quintana, H. [Departmento de Astronomia y Astrofisica, Pontificia Universidad Catolica de Chile, Casilla 306, CL 22 Santiago (Chile); Sluse, D., E-mail: surdej@astro.ulg.ac.b [Astronomisches Rechen-Institut am Zentrum fuer Astronomie der Universitaet Heidelberg, Moenchhofstrasse 12-14, 69120 Heidelberg (Germany)

2010-05-15T23:59:59.000Z

26

Generation of Sound Bullets with a Nonlinear Acoustic Lens  

E-Print Network (OSTI)

Acoustic lenses are employed in a variety of applications, from biomedical imaging and surgery, to defense systems, but their performance is limited by their linear operational envelope and complexity. Here we show a dramatic focusing effect and the generation of large amplitude, compact acoustic pulses (sound bullets) in solid and fluid media, enabled by a tunable, highly nonlinear acoustic lens. The lens consists of ordered arrays of granular chains. The amplitude, size and location of the sound bullets can be controlled by varying static pre-compression on the chains. We support our findings with theory, numerical simulations, and corroborate the results experimentally with photoelasticity measurements. Our nonlinear lens makes possible a qualitatively new way of generating high-energy acoustic pulses, enabling, for example, surgical control of acoustic energy.

Alessandro Spadoni; Chiara Daraio

2009-08-31T23:59:59.000Z

27

A Microscale Gas Trapping Investigation Markus Buchgraber, Anthony R. Kovscek  

E-Print Network (OSTI)

A Microscale Gas Trapping Investigation Markus Buchgraber, Anthony R. Kovscek Department of Energy unit Residual Trapping Sgi Sg,max krg krg Sgt(Soi) Sgt,max Gas Saturation Gas relative Land Model * * ** 1 )( gi gi gigt CS S SS + = Sgf Sg Sgt,max kd rg Sg Gas Saturation

Stanford University

28

PARALLEL COMPUTATION OF THE BOLTZMANN TRANSPORT EQUATION FOR MICROSCALE HEAT  

E-Print Network (OSTI)

silicon ðSi� and silicon dioxide ðSiO2�. The equation of phonon radiative transport ðERPT�, in itsPARALLEL COMPUTATION OF THE BOLTZMANN TRANSPORT EQUATION FOR MICROSCALE HEAT TRANSFER fundamental Boltzmann transport equations have been reported [3, 7, 8]. This has consequently instigated a re

Miller, Richard S.

29

International Lens Design Conference, Monterey, CA, June 11-14, 1990, Proceedings  

SciTech Connect

The present conference on lens design encompasses physical and geometrical optics, diffractive optics, the optimization of optical design, software packages, ray tracing, the use of artificial intelligence, the achromatization of materials, zoom optics, microoptics and GRIN lenses, and IR lens design. Specific issues addressed include diffraction-performance calculations in lens design, the optimization of the optical transfer function, a rank-down method for automatic lens design, applications of quadric surfaces, the correction of aberrations by using HOEs in UV and visible imaging systems, and an all-refractive telescope for intersatellite communications. Also addressed are automation techniques for optics manufacturing, all-reflective phased-array imaging telescopes, the thermal aberration analysis of a Nd:YAG laser, the analysis of illumination systems, athermalized FLIR optics, and the design of array systems using shared symmetry.

Lawrence, G.N. (Arizona University, Tucson (United States))

1990-01-01T23:59:59.000Z

30

e Lens Solenoid | Superconducting Magnet Division  

NLE Websites -- All DOE Office Websites (Extended Search)

Electron Lens Solenoid Electron Lens Solenoid To increase the proton beam luminosity in RHIC, an electron lens (e-lens) magnet system with two superconducting solenoids is being built at Brookhaven National Laboratory. Initial Design of 200 mm, 6T Superconducting Solenoid for e-lens (pdf), R. Gupta, 3/30/10 Iterated Design of 200 mm, 6T Superconducting Solenoid for e-lens (pdf), R. Gupta, 4/6/10 Corrector Designs for Superconducting Solenoid for e-lens (pdf), R. Gupta, 4/14/10 eLens Layout (pdf), P. Kovach, 5/25/10 eLens Main Solenoid (pdf), A. Marone, 5/25/10 Optimization in Corrector Design for Superconducting Solenoid for e-Lens (pdf), R. Gupta, 6/15/10 Main Solenoid Axial Force Retention (pdf), A. Marone 8/24/10 Superconducting Solenoid for e-lens with Fringe Field Coil (pdf), R.

31

Lens system for a photo ion spectrometer  

DOE Patents (OSTI)

A lens system in a photo ion spectrometer for manipulating a primary ion beam and ionized atomic component is disclosed. The atomic components are removed from a sample by a primary ion beam using the lens system, and the ions are extracted for analysis. The lens system further includes ionization resistant coatings for protecting the lens system. 8 figs.

Gruen, D.M.; Young, C.E.; Pellin, M.J.

1990-11-27T23:59:59.000Z

32

Lens system for a photo ion spectrometer  

DOE Patents (OSTI)

A lens system in a photo ion spectrometer for manipulating a primary ion beam and ionized atomic component. The atomic components are removed from a sample by a primary ion beam using the lens system, and the ions are extracted for analysis. The lens system further includes ionization resistant coatings for protecting the lens system.

Gruen, Dieter M. (Downers Grove, IL); Young, Charles E. (Westmont, IL); Pellin, Michael J. (Napersville, IL)

1990-01-01T23:59:59.000Z

33

Micro-Scale Catalytic Reactor for Syngas Production  

Science Journals Connector (OSTI)

Micro-Scale Catalytic Reactor for Syngas Production ... The H2 yield (?H2) was evaluated as moles of H2 produced per mole of CH4 converted in the reforming channel. ... In particular, the maximum temperature moves from a location close to the reactor center (for MCH4-sr/MCH4-co = 2) toward the reactor inlet producing in the case of MCH4-sr/MCH4-co =2.75 decreasing temperature profiles without a maximum. ...

S. Vaccaro; L. Malangone; P. Ciambelli

2010-07-01T23:59:59.000Z

34

Gas lens laser produced plasma  

Science Journals Connector (OSTI)

A gas lens is used to focus a megawatt ruby laser beam on to a target to create a plasma. By using focal plane photographs and Faraday cup plasma diagnostics, the focusing ability of a...

Notcutt, Mark; Waltham, J A; Michaelis, M M; Cunningham, P F; Cazalet, R S

1989-01-01T23:59:59.000Z

35

Beyond the Thin Lens Approximation  

E-Print Network (OSTI)

We obtain analytic formulae for the null geodesics of Friedmann-Lema\\^{\\i}tre-Robertson-Walker spacetimes with scalar perturbations in the longitudinal gauge. We use these to provide a rigorous derivation of the cosmological lens equation. We obtain an expression for the magnification of a bundle of light rays in these spacetimes without restriction to static or thin lens scenarios. We show how the usual magnification matrix naturally emerges in the appropriate limits.

Ted Pyne; Mark Birkinshaw

1994-05-10T23:59:59.000Z

36

Beyond the Thin Lens Approximation  

E-Print Network (OSTI)

We obtain analytic formulae for the null geodesics of Friedmann-Lema\\^{\\i}tre-Robertson-Walker spacetimes with scalar perturbations in the longitudinal gauge. From these we provide a rigorous derivation of the cosmological lens equation, and obtain an expression for the magnification of a bundle of light rays without restriction to static or thin lens scenarios. We show how the usual magnification matrix naturally emerges in the appropriate limits.

Ted Pyne; Mark Birkinshaw

1995-04-19T23:59:59.000Z

37

Method and apparatus for actively controlling a micro-scale flexural plate wave device  

DOE Patents (OSTI)

An actively controlled flexural plate wave device provides a micro-scale pump. A method of actively controlling a flexural plate wave device produces traveling waves in the device by coordinating the interaction of a magnetic field with actively controlled currents. An actively-controlled flexural plate wave device can be placed in a fluid channel and adapted for use as a micro-scale fluid pump to cool or drive micro-scale systems, for example, micro-chips, micro-electrical-mechanical devices, micro-fluid circuits, or micro-scale chemical analysis devices.

Dohner, Jeffrey L. (Albuquerque, NM)

2001-01-01T23:59:59.000Z

38

Fabrication and Performance of a Lithium X-Ray Lens  

SciTech Connect

Compound refractive lenses (CRLs) are arrays of concave lenses whose simple design and ease in implementation and alignment make them an attractive optic to focus x-rays. Factors considered in designing CRLs include lens material, fabrication, and assembly. Lithium is a desirable material because it provides the largest index of refraction decrement per unit absorption length of any solid elements. Lithium is a difficult material to handle and fabricate because it is rather malleable and more importantly, it reacts with moisture, and to a lesser extent, with oxygen and nitrogen in air. It also tends to adhere to molds and dies.We report on the fabrication and performance of a parabolic lithium lens consisting of 32 lenslets. Lenslets are fabricated in a precision press using an indenter with a parabolic profile and a 100 {mu}m tip radius. The indenter is made of stainless steel and is figured using a computer numerically controlled (CNC) machine. The lens is designed to have a 1.7 m focal length at 10 keV energy. In an experiment conducted at the Advanced Photon Source (APS), a 0.5 mm x 0.5 mm monochromatic undulator beam strikes the lens. A focal length of 1.71, a focal spot size of 24 {mu}m x 34 {mu}m, and a peak intensity gain of over 18 are obtained.

Young, Kristina; Khounsary, Ali [Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439 (United States); Department of Mechanical, Materials, and Aerospace Engineering, Illinois Institute of Technology, Chicago, IL 60616 (United States); Jansen, Andrew N. [Chemical Engineering Division, Argonne National Laboratory, Argonne, IL 60439 (United States); Dufresne, Eric M. [Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439 (United States); Nash, Philip [Department of Mechanical, Materials, and Aerospace Engineering, Illinois Institute of Technology, Chicago, IL 60616 (United States)

2007-01-19T23:59:59.000Z

39

Flow shaping using three-dimensional microscale gas discharge  

SciTech Connect

We introduce a flow shaping mechanism using surface compliant microscale gas discharge. A three-dimensional finite element-based multiscale ionized gas flow code is utilized to analyze charge separation, potential distribution, and flow inducement mechanism. For the case of quiescent flow, a horseshoe-shaped plasma generator is introduced. Due to its unusual shape, the three-dimensional electric force excites a pinching effect on the fluid inside selectively powered electrode arc. Such effect is capable of tripping the flow-ejecting fluid normal to the plane of the actuator and thus can be very useful for many applications.

Wang, C.-C.; Roy, Subrata [Department of Mechanical and Aerospace Engineering, Computational Plasma Dynamics Laboratory and Test Facility, University of Florida, Gainesville, Florida 32611-6300 (United States)

2009-08-24T23:59:59.000Z

40

Magnetic Patterning of Permanent-Magnet Rotors for Microscale Motor/Generators  

E-Print Network (OSTI)

offers three advantages. First, eliminating the integrated winding permits simpler MH design element modeling 1. INTRODUCTION High power-density, microscale, axial-flux, PM machines [1-3] typically (Thickness = 0.5 mm, OD=9.5 mm) encased in a Ti adaptor used for microscale power generator [1]; (b

Note: This page contains sample records for the topic "microscale lens array" 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

PERSPECTIVES Nano-to-Microscale Mechanical Switches and Fuses Mediate Adhesive Contacts between  

E-Print Network (OSTI)

PERSPECTIVES Nano-to-Microscale Mechanical Switches and Fuses Mediate Adhesive Contacts between to their molecular origins. The present work focuses on nano-to-microscale regulatory aspects that mediate and that they had to be primarily mechanical. Accordingly, our experimental approach was to study in vitro the nano

Heinrich, Volkmar

42

A multiple temperature kinetic model and its application to micro-scale gas flow simulations  

E-Print Network (OSTI)

A multiple temperature kinetic model and its application to micro-scale gas flow simulations model, micro-scale flows. 1. Introduction Gas flows can be classified according to the flow regimes_pku@yahoo.com.cn Abstract This paper presents a numerical approach to solve the multiple temperature kinetic model (MTKM

Xu, Kun

43

Biomechanics of the lens capsule  

E-Print Network (OSTI)

-dimensional and based on linear elastic theory. Therefore, due to the lack of multiaxial data, we seek to quantify the multiaxial pressure-strain behavior in the porcine anterior lens capsule. Specifically, the goal of this research project is to design and construct... capsule is small in comparison to its in-plane dimensions, the lens capsule can be modeled as a membrane. important in membrane theory is the Cauchy stress resultant tensor T, of which the in-plane physical components are given by where h...

Delange, Sherry Leanne

2012-06-07T23:59:59.000Z

44

A New Electron Lens System with a Light Optical Lens  

Science Journals Connector (OSTI)

......118 Letter (50) 13X53 1 3 X 80 13 X 177 1 3 X 270 Fig. 3. Photographs taken with a new lens systen (Specimen : Micro-grid mesh) and a projection lenses, while in case of low magnification, through two electron lenses--the objective......

Hirokazu KIMURA

1960-01-01T23:59:59.000Z

45

Sample extraction and injection with a microscale preconcentrator.  

SciTech Connect

This report details the development of a microfabricated preconcentrator that functions as a fully integrated chemical extractor-injector for a microscale gas chromatograph (GC). The device enables parts-per-billion detection and quantitative analysis of volatile organic compounds (VOCs) in indoor air with size and power advantages over macro-scale systems. The 44 mm{sup 3} preconcentrator extracts VOCs using highly adsorptive, granular forms of graphitized carbon black and carbon molecular sieves. The micron-sized silicon cavities have integrated heating and temperature sensing allowing low power, yet rapid heating to thermally desorb the collected VOCs (GC injection). The keys to device construction are a new adsorbent-solvent filling technique and solvent-tolerant wafer-level silicon-gold eutectic bonding technology. The product is the first granular adsorbent preconcentrator integrated at the wafer level. Other advantages include exhaustive VOC extraction and injection peak widths an order of magnitude narrower than predecessor prototypes. A mass transfer model, the first for any microscale preconcentrator, is developed to describe both adsorption and desorption behaviors. The physically intuitive model uses implicit and explicit finite differences to numerically solve the required partial differential equations. The model is applied to the adsorption and desorption of decane at various concentrations to extract Langmuir adsorption isotherm parameters from effluent curve measurements where properties are unknown a priori.

Robinson, Alex Lockwood (Advanced Sensor Technologies, Albuquerque, NM); Chan, Helena Kai Lun

2007-09-01T23:59:59.000Z

46

Spray-Formed Tooling with Micro-Scale Features  

SciTech Connect

Molds, dies, and related tooling are used to shape many of the plastic and metal components we use every day at home and work. Traditional mold-making practices are labor and capital equipment intensive, involving multiple machining, benching and heat treatment operations. Spray forming is an alternative method to manufacture molds and dies. The general concept is to atomize and deposit droplets of a tooling alloy onto a pattern to form a thick deposit while imaging the pattern’s shape, surface texture and details. Unlike conventional machining, this approach can be used to fabricate tooling with micro-scale surface features. This paper describes a research effort to spray form molds and dies that are used to image micro-scale surface textures into polymers. The goal of the study is to replicate textures that give rise to superhydrophobic behavior by mimicking the surface structure of highly water repellent biological materials such as the lotus leaf. Spray conditions leading to high transfer fidelity of features into the surface of molded polymers will be described. Improvements in water repellency of these materials was quantified by measuring the static contact angle of water droplets on flat and textured surfaces.

Kevin McHugh

2010-06-01T23:59:59.000Z

47

Laser-assisted microscale deformation of stainless steels and ceramics  

E-Print Network (OSTI)

the storage capacity in a hard drive is to reduce the distance between the disk surface and the disk head, diode-pumped Nd:YLF laser beam with a 10-ns pulse width focused to a small spot 20 m diameter through a focusing lens system. As shown in Fig. 1, the focused laser beam pulses scans over the target surface

Xu, Xianfan

48

Lens-array PDV Probe Using a Pyramid Prism  

SciTech Connect

A bug eye probe is shown using a pyramid prism, and its advantages and disadvantages are enumerated. Also shown is abug eye imaging probe, with its advantages and disadvantages enumerated.

Malone, R. M., Kaufman, M. I., Cox, B., Romero, V., Cata B., Sorenson, D. Pazuchanics, P.

2011-11-01T23:59:59.000Z

49

Nanocylinder arrays  

DOE Patents (OSTI)

Pathways to rapid and reliable fabrication of nanocylinder arrays are provided. Simple methods are described for the production of well-ordered arrays of nanopores, nanowires, and other materials. This is accomplished by orienting copolymer films and removing a component from the film to produce nanopores, that in turn, can be filled with materials to produce the arrays. The resulting arrays can be used to produce nanoscale media, devices, and systems.

Tuominen, Mark (Shutesbury, MA); Schotter, Joerg (Bielefeld, DE); Thurn-Albrecht, Thomas (Freiburg, DE); Russell, Thomas P. (Amherst, MA)

2009-08-11T23:59:59.000Z

50

Poster Sessions J. Dudhia Mesoscale and Microscale Meteorology Division  

NLE Websites -- All DOE Office Websites (Extended Search)

J. Dudhia J. Dudhia Mesoscale and Microscale Meteorology Division National Center for Atmospheric Research Boulder, CO 80307-3000 Introduction The concept of an Integrated Data Assimilation and Sounding System (IDASS) ensures that the needs of data collection are partly determined by the requirements of an assimilating mesoscale model. Hence, the sounding strategy is geared towards allowing the model to do the best possible job in representing the atmosphere over CART sites, for example. It is not clear a priori what density of coverage or types of data are required for a good simulation. In this work, we address the problem of determining the impact of varying the density of coverage of an idea! network by purely numerical experimentation. We use one model run to provide data and another independent run to assimilate it.

51

JGI - Len Pennacchio - Select Publications  

NLE Websites -- All DOE Office Websites (Extended Search)

Len Pennacchio - Select Publications Len Pennacchio - Select Publications Graduate Studies Pennacchio, L. A., Lehesjoki, A.-E., Stone, N. E., Willour, V., Virtaneva, K., Miao, J., D'Amato, E., Ramirez, L., Faham, M., Koskiniemi, M., Warrington, J., Norio, R., A., de la Chapelle, A., Cox, D. R. and Myers, R. M. 1996. Mutations in the gene encoding cystatin B in Progressive Myoclonus Epilepsy (EPM1). Science 271(5256): 1731-1734. Virtaneva, K., D'Amato, E., Miao, J., Koskiniemi, M., Norio, R., Avanzini, G., Franceschetti, S., Michelucci, R., Tassinari, C. A., Omer, S., Pennacchio, L. A., Myers, R. M., Dieguez-Lucena, J. L., Krahe, R., de la Chapelle, A., and Lehesjoki, A.-E. 1997. Unstable minisatellite expansion causing recessive myoclonus epilepsy (EPM1). Nature Genetics 15(4): 393-396. Pennacchio, L. A., Bouley, D. M., Higgins, K. M., Scott, M. P., Noebels, J.

52

Embedded avionics with Kalman state estimation for a novel micro-scale unmanned aerial vehicle  

E-Print Network (OSTI)

An inertial navigation system leveraging Kalman estimation techniques and quaternion dynamics is developed for deployment to a micro-scale unmanned aerial vehicle (UAV). The capabilities, limitations, and requirements of ...

Tzanetos, Theodore

2013-01-01T23:59:59.000Z

53

Evaporation of Water from Particles in the Aerodynamic Lens Inlet...  

NLE Websites -- All DOE Office Websites (Extended Search)

of Water from Particles in the Aerodynamic Lens Inlet: An Experimental Study. Evaporation of Water from Particles in the Aerodynamic Lens Inlet: An Experimental Study. Abstract:...

54

A Fisheye Lens for Many Point PDV  

SciTech Connect

The features of the fisheye lens are illustrated, including a design with reflector prisms. The fisheye fiber map and the beam footprint are shown. Fisheye rough-angle metrology was done and results presented. Next steps are given, including a smaller top fisheye lens element, longer reflector prisms with better mounting, and different fiber arrangements.

Frogget, B.

2011-11-01T23:59:59.000Z

55

Lens aberration aware placement for timing yield  

Science Journals Connector (OSTI)

Process variations due to lens aberrations are to a large extent systematic, and can be modeled for purposes of analyses and optimizations in the design phase. Traditionally, variations induced by lens aberrations have been considered random due to their ... Keywords: Layout, design for manufacturing, lithography, timing yield

Andrew B. Kahng; Chul-Hong Park; Puneet Sharma; Qinke Wang

2009-01-01T23:59:59.000Z

56

A coupled mesoscale–microscale framework for wind resource estimation and farm aerodynamics  

Science Journals Connector (OSTI)

Abstract This study discusses the development of a coupled mesoscale–microscale framework for wind resource estimation and farm aerodynamics. WINDWYO is a computational framework for performing coupled mesoscale–microscale simulations. The framework is modular, automated and supports coupling of different mesoscale and microscale solvers using overset or matched grids. The modular nature of the framework and the support for overset grids allows the independent development of mesoscale and microscale solvers and the efficient coupling between the codes. The performance of the framework is evaluated by coupling Weather Research and Forecasting (WRF) model with three microscale computational fluid dynamics (CFD) codes of varying complexity. The solvers used are: (i) UWake: a blade element model with free-vortex wake, (ii) Flowyo: large eddy simulation code with actuator line/disk parametrization of the wind turbine and (iii) HELIOS: detached eddy simulation code with full rotor modeling and adaptive mesh refinement. Power predictions and wake visualization of single turbine and off-shore Lillgrund wind farm in uniform and turbulent inflow are used to demonstrate the capabilities of the framework.

Harish Gopalan; Christopher Gundling; Kevin Brown; Beatrice Roget; Jayanarayanan Sitaraman; Jefferey D. Mirocha; Wayne O. Miller

2014-01-01T23:59:59.000Z

57

Job Arrays  

NLE Websites -- All DOE Office Websites (Extended Search)

job submission, and easier job management. If you find yourself submitting thousands of jobs at a time that are largely identical, you should use job arrays. For example, if you...

58

Using Arrays  

Science Journals Connector (OSTI)

Although we have covered enough material to build up complex systems, there is still quite a bit of important functionality left to cover. In this chapter, we focus on arrays and the control structures ( i.e., if...

Michael Tiller Ph.D.

2001-01-01T23:59:59.000Z

59

Explosive plane-wave lens  

DOE Patents (OSTI)

An explosive plane-wave air lens which enables a spherical wave form to be converted to a planar wave without the need to specially machine or shape explosive materials is described. A disc-shaped impactor having a greater thickness at its center than around its periphery is used to convert the spherical wave into a plane wave. When the wave reaches the impactor, the center of the impactor moves first because the spherical wave reaches the center of the impactor first. The wave strikes the impactor later in time as one moves radially along the impactor. Because the impactor is thinner as one moves radially outward, the velocity of the impactor is greater at the periphery than at the center. An acceptor explosive is positioned so that the impactor strikes the acceptor simultaneously. Consequently, a plane detonation wave is propagated through the acceptor explosive. 4 figs.

Marsh, S.P.

1988-03-08T23:59:59.000Z

60

Explosive plane-wave lens  

DOE Patents (OSTI)

An explosive plane-wave air lens which enables a spherical wave form to be converted to a planar wave without the need to specially machine or shape explosive materials is described. A disc-shaped impactor having a greater thickness at its center than around its periphery is used to convert the spherical wave into a plane wave. When the wave reaches the impactor, the center of the impactor moves first because the spherical wave reaches the center of the impactor first. The wave strikes the impactor later in time as one moves radially along the impactor. Because the impactor is thinner as one moves radially outward, the velocity of the impactor is greater at the periphery than at the center. An acceptor explosive is positioned so that the impactor strikes the acceptor simultaneously. Consequently, a plane detonation wave is propagated through the acceptor explosive. 3 figs., 3 tabs.

Marsh, S.P.

1987-03-12T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

Explosive plane-wave lens  

DOE Patents (OSTI)

An explosive plane-wave air lens which enables a spherical wave form to be converted to a planar wave without the need to specially machine or shape explosive materials is described. A disc-shaped impactor having a greater thickness at its center than around its periphery is used to convert the spherical wave into a plane wave. When the wave reaches the impactor, the center of the impactor moves first because the spherical wave reaches the center of the impactor first. The wave strikes the impactor later in time as one moves radially along the impactor. Because the impactor is thinner as one moves radially outward, the velocity of the impactor is greater at the periphery than at the center. An acceptor explosive is positioned so that the impactor strikes the acceptor simultaneously. Consequently, a plane detonation wave is propagated through the acceptor explosive.

Marsh, Stanley P. (Los Alamos, NM)

1988-01-01T23:59:59.000Z

62

Toward microscale Cu,,In,Ga...Se2 solar cells for efficient conversion and optimized material usage: Theoretical evaluation  

E-Print Network (OSTI)

solar cells are gaining a growing market share in the photovoltaic field. CIGS thin film solar cells. In this paper, the behavior of microscale thin film solar cells under concen- tration will be studied. We focusToward microscale Cu,,In,Ga...Se2 solar cells for efficient conversion and optimized material usage

Boyer, Edmond

63

Development of a silicon-based passive gas-liquid separation system for microscale direct methanol fuel cells  

Science Journals Connector (OSTI)

The design, fabrication and performance characterisation of a passive gas-liquid separation system is presented in this paper. The gas-liquid separation system is silicon-based and its fabrication is compatible with the existing CMU design of the microscale direct methanol fuel cell (DMFC). Both gas and liquid separators consist of staggered arrays of etched-through holes fabricated by deep reactive ion etching (DRIE). The gas separator is coated with a thin layer of hydrophobic polymer to substantiate the gas-liquid separation. To visually characterise the system performance, the gas-liquid separation system is made on a single wafer with a glass plate bonded on the top to form a separation chamber with a narrow gap in between. Benzocyclobutene (BCB) is applied for the low-temperature bonding. The maximum pressure for the liquid leakage of the gas separators is experimentally determined and compared with the values predicted theoretically. Several successful gas-liquid separations are observed at liquid pressures between 14.2 cmH2O and 22.7 cmH2O, liquid flow rates between 0.705 cc/min and 1.786 cc/min, and CO2 flow rates between 0.15160 cc/min to 0.20435 cc/min.

C.C. Hsieh; S.C. Yao; Yousef Alyousef

2009-01-01T23:59:59.000Z

64

Nano- and microscale particles and global electromagnetic resonances in the Earth-ionosphere cavity  

SciTech Connect

The influence of nano-and microscale particles (dust grains) on the global electromagnetic (Schumann) cavity has been studied in the context of two possible mechanisms. First, the presence of charged microscale particles in the ionospheric plasma modifies the dispersion properties of the upper boundary of the Schumann cavity and, thus, affects its eigenfrequencies and quality factor. Second, there is a relation between the dust concentration in the atmosphere and lightning discharges, which excite Schumann resonances. Therefore, dust grains can enhance the energy pumping of the cavity, thereby increasing the amplitude of electromagnetic oscillations in it.

Besedina, Yu. N.; Popel, S. I. [Russian Academy of Sciences, Institute of Geosphere Dynamics (Russian Federation)

2007-02-15T23:59:59.000Z

65

LensMEM: A Gravitational Lens Inversion Algorithm Using the Maximum Entropy Method  

E-Print Network (OSTI)

We present a new algorithm for inverting poorly resolved gravitational lens systems using the maximum entropy method (MEM). We test the method with simulations and then apply it to an 8 GHz VLA map of the radio ring lens MG1654+134. We model the lens as a singular isothermal sphere embedded in an external shear field and find the critical radius of the lens is $b=0\\parcs9820$, the dimensionless shear is $\\gamma=0.0771$, and the position angle of the shear is $\\theta=100\\pdeg8$. These results are consistent with the results obtained by Kochanek (1995) using a complementary inversion algorithm based on Clean.

S. Wallington; C. S. Kochanek; R. Narayan

1995-11-28T23:59:59.000Z

66

A Plasma Lens for Magnetron Sputtering  

SciTech Connect

A plasma lens, consisting of a solenoid and potential-defining ring electrodes, has been placed between a magnetron and substrates to be coated. Photography reveals qualitative information on excitation, ionization, and the transport of plasma to the substrate.

Anders, Andre; Brown, Jeff

2010-11-30T23:59:59.000Z

67

Fresnel lens analysis for solar energy applications  

Science Journals Connector (OSTI)

In this paper we analyze an arbitrarily shaped lineal Fresnel lens acting either as sole concentration stage or as the first stage of a two-stage concentration system in which the...

Lorenzo, E; Luque, A

1981-01-01T23:59:59.000Z

68

Electrostatic Energy Harvester and Li-Ion Charger Circuit for Micro-Scale Applications  

E-Print Network (OSTI)

, low duty-cycle task multiplex- ing, and smart power-aware networks, the energy stored in micro- scaleElectrostatic Energy Harvester and Li-Ion Charger Circuit for Micro-Scale Applications Erick O micro-systems like biomedical implants and ad-hoc wireless transceiver micro-sensors continue

Rincon-Mora, Gabriel A.

69

Adaptable Chip-Level Microfluidic Packaging for a Micro-Scale Gas Chromatograph  

E-Print Network (OSTI)

Adaptable Chip-Level Microfluidic Packaging for a Micro-Scale Gas Chromatograph Nathan Ward1@egr.msu.edu Abstract-- In this paper, we present a robust and adaptable technique to integrate microfluidics with an on the microfluidic package with non-sorbent epoxy. The stability and efficacy of the integrated detector cell

Mason, Andrew

70

Abstract--A low noise optical sensor and biocompatible microscale optical filters for integrated fluorescence sensors  

E-Print Network (OSTI)

Abstract--A low noise optical sensor and biocompatible microscale optical filters for integrated fluorescence sensors were developed and tested. The sensor was fabricated in a 0.5 µm CMOS process. The measured reset noise of the sensor is reduced by a factor of 10 compared to conventional active pixel

Maryland at College Park, University of

71

Self-Assembly of Microscale Objects at a Liquid/Liquid Interface through Lateral Capillary Forces  

E-Print Network (OSTI)

Self-Assembly of Microscale Objects at a Liquid/Liquid Interface through Lateral Capillary Forces allowed to self-assemble at the perfluorodecalin/water interface. These plates were fabricated from, the designs of hydrophobic edges necessary to generate menisci useful in self-assembly were different for 100

Prentiss, Mara

72

Planar Gold Nanoparticle Clusters as Microscale Mirrors Jin Young Kim and Frank E. Osterloh*  

E-Print Network (OSTI)

Planar Gold Nanoparticle Clusters as Microscale Mirrors Jin Young Kim and Frank E. Osterloh,4,5 In extension of our work on nanoparticle-based waveguides,6-9 we report here a scalable chemical synthesis of micrometer-scale mirrors based on Au nanoparticles and Ca2Nb3O10 nanoplates. Similar to their macroscale

Osterloh, Frank

73

Laser vaporization/ionization interface for coupling microscale separation techniques with mass spectrometry  

DOE Patents (OSTI)

The present invention provides a laser-induced vaporization and ionization interface for directly coupling microscale separation processes to a mass spectrometer. Vaporization and ionization of the separated analytes are facilitated by the addition of a light-absorbing component to the separation buffer or solvent. 8 figs.

Yeung, E.S.; Chang, Y.C.

1999-06-29T23:59:59.000Z

74

MICROSCALE THREE-DIMENSIONAL HEMISPHERICAL SHELL RESONATORS FABRICATED FROM METALLIC GLASS  

E-Print Network (OSTI)

MICROSCALE THREE-DIMENSIONAL HEMISPHERICAL SHELL RESONATORS FABRICATED FROM METALLIC GLASS M. Kanik.S. Abstract-- A novel use of bulk metallic glasses in microresonator applications is reported and a method scale glass blowmolding using quartz [2] and Pyrex [3], as well as the isotropic etching of silicon

M'Closkey, Robert T.

75

Microscale Behavior in Amphiphilic Fluid Mixtures Predicted by the SAFT Equation  

Science Journals Connector (OSTI)

Microscale Behavior in Amphiphilic Fluid Mixtures Predicted by the SAFT Equation ... Molecular-Based Equations of State for Associating Fluids: A Review of SAFT and Related Approaches ... Molecular-Based Equations of State for Associating Fluids: A Review of SAFT and Related Approaches ...

Daniel R. Kuespert; Marc D. Donohue

1995-01-01T23:59:59.000Z

76

Evaluation of a heliostat tracker for linear Fresnel lens photovoltaic concentrators  

SciTech Connect

This report presents the results of an evaluation of a heliostat tracking structure used as a two-axis tracking platform for ENTECH's linear focus Fresnel lens photovoltaic collectors. The study included the installation and operation of a heliostat tracker populated with 30 modules (1 operational and 29 non-operational) on a 32-ft x 32-ft platform. Details of the array installation, collector mounting, and array tracking accuracy are provided. Test results demonstrate that the heliostat tracker meets the performance requirements imposed by the collector. The evaluation includes a comparison of the heliostat tracker approach with the current tracker approach (a roll/tilt array). Results of the comparison do not identify a clearly superior option.

Not Available

1986-12-01T23:59:59.000Z

77

Application of a ratiometric laser induced fluorescence (LIF) thermometry for micro-scale temperature measurement for natural convection flows  

E-Print Network (OSTI)

A ratiometric laser induced fluorescence (LIF) thermometry applied to micro-scale temperature measurement for natural convection flows. To eliminate incident light non-uniformity and imperfection of recording device, two fluorescence dyes are used...

Lee, Heon Ju

2004-11-15T23:59:59.000Z

78

Fabrication of microscale medical devices by two-photon polymerization with multiple foci via a spatial light modulator  

Science Journals Connector (OSTI)

Two-photon polymerization is an appealing technique for producing microscale devices due to its flexibility in producing structures with a wide range of geometries as well as its...

Gittard, Shaun D; Nguyen, Alexander; Obata, Kotaro; Koroleva, Anastasia; Narayan, Roger J; Chichkov, Boris N

2011-01-01T23:59:59.000Z

79

Microscale behavior in amphiphilic fluid mixtures predicted by the SAFT equation  

SciTech Connect

The thermodynamic behavior of amphiphilic fluids is investigated by applying the sphere-and-bond formalism to the statistical associating fluid theory (SAFT); general equations are presented for obtaining microscale information from the SAFT equation. Both bulk phase and microphase equilibria for a model of a chain amphiphile dissolved in a simple solvent are determined, and fluid microphase compositions also are calculated. 22 refs., 8 figs.

Kuespert, D.R.; Donohue, M.D. [Johns Hopkins Univ., Baltimore, MD (United States)

1995-03-30T23:59:59.000Z

80

MICROSCALE METABOLIC, REDOX AND ABIOTIC REACTIONS IN HANFORD 300 AREA SUBSURFACE SEDIMENTS  

SciTech Connect

The Hanford 300 Area is a unique site due to periodic hydrologic influence of river water resulting in changes in groundwater elevation and flow direction. This area is also highly subject to uranium remobilization, the source of which is currently believed to be the region at the base of the vadose zone that is subject to period saturation due to the changes in the water levels in the Columbia River. We found that microbial processes and redox and abiotic reactions which operate at the microscale were critical to understanding factors controlling the macroscopic fate and transport of contaminants in the subsurface. The combined laboratory and field research showed how microscale conditions control uranium mobility and how biotic, abiotic and redox reactions relate to each other. Our findings extended the current knowledge to examine U(VI) reduction and immobilization using natural 300 Area communities as well as selected model organisms on redox-sensitive and redox-insensitive minerals. Using innovative techniques developed specifically to probe biogeochemical processes at the microscale, our research expanded our current understanding of the roles played by mineral surfaces, bacterial competition, and local biotic, abiotic and redox reaction rates on the reduction and immobilization of uranium.

Beyenal, Haluk [WSU] [WSU; McLEan, Jeff [JCVI] [JCVI; Majors, Paul [PNNL] [PNNL; Fredrickson, Jim [PNNL] [PNNL

2013-11-14T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

Compound refractive X-ray lens  

DOE Patents (OSTI)

An apparatus and method for focusing X-rays. In one embodiment, his invention is a commercial-grade compound refractive X-ray lens. The commercial-grade compound refractive X-ray lens includes a volume of low-Z material. The volume of low-Z material has a first surface which is adapted to receive X-rays of commercially-applicable power emitted from a commercial-grade X-ray source. The volume of low-Z material also has a second surface from which emerge the X-rays of commercially-applicable power which were received at the first surface. Additionally, the commercial-grade compound refractive X-ray lens includes a plurality of openings which are disposed between the first surface and the second surface. The plurality of openings are oriented such that the X-rays of commercially-applicable power which are received at the first surface, pass through the volume of low-Z material and through the plurality openings. In so doing, the X-rays which emerge from the second surface are refracted to a focal point.

Nygren, David R. (Berkeley, CA); Cahn, Robert (Walnut Creek, CA); Cederstrom, Bjorn (Traellborg, SE); Danielsson, Mats (Stocksund, SE); Vestlund, Jonas (Stockholm, SE)

2000-01-01T23:59:59.000Z

82

Microhole Arrays / FLASH  

Energy.gov (U.S. Department of Energy (DOE))

Microhole Arrays / FLASH presentation at the April 2013 peer review meeting held in Denver, Colorado.

83

DISCOVERY OF A QUADRUPLE LENS IN CANDELS WITH A RECORD LENS REDSHIFT z = 1.53  

SciTech Connect

Using spectroscopy from the Large Binocular Telescope and imaging from the Hubble Space Telescope we discovered the first strong galaxy lens at z {sub lens} > 1. The lens has a secure photometric redshift of z = 1.53 ± 0.09 and the source is spectroscopically confirmed at z = 3.417. The Einstein radius (0.''35; 3.0 kpc) encloses 7.6 × 10{sup 10} M {sub ?}, with an upper limit on the dark matter fraction of 60%. The highly magnified (40×) source galaxy has a very small stellar mass (?10{sup 8} M {sub ?}) and shows an extremely strong [O III]{sub 5007Å} emission line (EW{sub 0} ? 1000 Å) bolstering the evidence that intense starbursts among very low-mass galaxies are common at high redshift.

Van der Wel, A.; Van de Ven, G.; Maseda, M.; Rix, H. W.; Rudnick, G. H. [Max-Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg (Germany)] [Max-Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg (Germany); Grazian, A. [INAF - Osservatorio Astronomico di Roma, via Frascati 33, I-00040 Monteporzio (Italy)] [INAF - Osservatorio Astronomico di Roma, via Frascati 33, I-00040 Monteporzio (Italy); Finkelstein, S. L. [George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A and M University, College Station, TX 77843 (United States)] [George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A and M University, College Station, TX 77843 (United States); Koo, D. C.; Faber, S. M. [UCO/Lick Observatory, Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States)] [UCO/Lick Observatory, Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States); Ferguson, H. C.; Koekemoer, A. M.; Grogin, N. A. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)] [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Kocevski, D. D., E-mail: vdwel@mpia.de [Department of Physics and Astronomy, University of Kentucky, 505 Rose Street, Lexington, KY 40506 (United States)

2013-11-01T23:59:59.000Z

84

THETRIS: A MICRO-SCALE TEMPERATURE AND GAS RELEASE MODEL FOR TRISO FUEL  

SciTech Connect

The dominating mechanism in the passive safety of gas-cooled, graphite-moderated, high-temperature reactors (HTRs) is the Doppler feedback effect. These reactor designs are fueled with sub-millimeter sized kernels formed into TRISO particles that are imbedded in a graphite matrix. The best spatial and temporal representation of the feedback effect is obtained from an accurate approximation of the fuel temperature. Most accident scenarios in HTRs are characterized by large time constants and slow changes in the fuel and moderator temperature fields. In these situations a meso-scale, pebble and compact scale, solution provides a good approximation of the fuel temperature. Micro-scale models are necessary in order to obtain accurate predictions in faster transients or when parameters internal to the TRISO are needed. Since these coated particles constitute one of the fundamental design barriers for the release of fission products, it becomes important to understand the transient behavior inside this containment system. An explicit TRISO fuel temperature model named THETRIS has been developed and incorporated into the CYNOD-THERMIX-KONVEK suite of coupled codes. The code includes gas release models that provide a simple predictive capability of the internal pressure during transients. The new model yields similar results to those obtained with other micro-scale fuel models, but with the added capability to analyze gas release, internal pressure buildup, and effects of a gap in the TRISO. The analyses show the instances when the micro-scale models improve the predictions of the fuel temperature and Doppler feedback. In addition, a sensitivity study of the potential effects on the transient behavior of high-temperature reactors due to the presence of a gap is included. Although the formation of a gap occurs under special conditions, its consequences on the dynamic behavior of the reactor can cause unexpected responses during fast transients. Nevertheless, the strong Doppler feedback forces the reactor to quickly stabilize.

J. Ortensi; A.M. Ougouag

2011-12-01T23:59:59.000Z

85

A Micro-Scale Model for Oxygen Reduction on LSM-YSZ Cathode  

SciTech Connect

In this study, a micro-scale model is developed to simulate the oxygen reduction on LSM-YSZ composite cathode. The model incorporates the effects of cathode microstructural properties on the local transport phenomena and electrochemistry inside the cathode. A detailed reaction mechanism is used in the model which has two parallel routes for oxygen conversion into oxide ions, namely two-phase boundary and three-phase boundary pathways. The model predicts field distributions of local thermodynamic values, over-potential, Faradaic current and other parameters relevant to cathode performance. Electrochemical impedance simulations are performed using the current model to analyze the contribution of various processes to the overall impedance.

Pakalapati, Suryanarayana Raju; Celik, Ismail; Finklea, Harry; Gong, Mingyang; Liu, Xingbo

2011-05-01T23:59:59.000Z

86

Lens transmission measurement for an absolute radiation thermometer  

SciTech Connect

The lens transmission for the National Institute of Metrology of China absolute radiation thermometer is measured by a hybrid method. The results of the lens transmission measurements are 99.002% and 86.792% for filter radiometers with center wavelengths 633 nm and 900 nm, respectively. These results, after correcting for diffraction factors and the size-of-source effect when the lens is incorporated within the radiometer, can be used for measurement of thermodynamic temperature. The expanded uncertainty of the lens transmission measurement system has been evaluated. It is 1.3×10{sup ?3} at 633 nm and 900 nm, respectively.

Hao, X.; Yuan, Z.; Lu, X. [Division of Thermometry and Materials Evaluation, National Institute of Metrology, Beijing (China)] [Division of Thermometry and Materials Evaluation, National Institute of Metrology, Beijing (China)

2013-09-11T23:59:59.000Z

87

Microscale geochemical gradients in Hanford 300 Area sediment biofilms and influence of uranium  

SciTech Connect

The presence and importance of microenvironments in the subsurface at contaminated sites were suggested by previous geochemical studies. However, no direct quantitative characterization of the geochemical microenvironments had been reported. We quantitatively characterized microscale geochemical gradients (dissolved oxygen (DO), H(2), pH, and redox potential) in Hanford 300A subsurface sediment biofilms. Our results revealed significant differences in geochemical parameters across the sediment biofilm/water interface in the presence and absence of U(VI) under oxic and anoxic conditions. While the pH was relatively constant within the sediment biofilm, the redox potential and the DO and H(2) concentrations were heterogeneous at the microscale (<500-1000 ?m). We found microenvironments with high DO levels (DO hotspots) when the sediment biofilm was exposed to U(VI). On the other hand, we found hotspots (high concentrations) of H(2) under anoxic conditions both in the presence and in the absence of U(VI). The presence of anoxic microenvironments inside the sediment biofilms suggests that U(VI) reduction proceeds under bulk oxic conditions. To test this, we operated our biofilm reactor under air-saturated conditions in the presence of U(VI) and characterized U speciation in the sediment biofilm. U L(III)-edge X-ray absorption spectroscopy (XANES and EXAFS) showed that 80-85% of the U was in the U(IV) valence state.

Nguyen, Hung D.; Cao, Bin; Mishra, Bhoopesh; Boyanov, Maxim I.; Kemner, Kenneth M.; Fredrickson, Jim K.; Beyenal, Haluk

2012-01-01T23:59:59.000Z

88

Role of ? in the Cosmological Lens Equation  

Science Journals Connector (OSTI)

The cosmological constant ? affects cosmological gravitational lensing. Effects due to ? can be studied in the framework of the Schwarzschild–de Sitter spacetime. Two novel contributions, which cannot be accounted for by a proper use of angular diameter distances, are derived. First, a term ??^?=2mb?/3 has to be added to the bending angle, where m is the lens mass and b the impact parameter. Second, ? brings about a difference in the redshifts of multiple images. Both effects are quite small for real astrophysical systems, ??^??1?arcsec and ?zs?10-7.

Mauro Sereno

2009-01-14T23:59:59.000Z

89

Microscale Thermoelectric Cooling Elements (TECs) are being proposed to cool down an integrated circuit to maintain its performance. The maximum cooling power of microscale TECs is significantly reduced by the interfacial resistance. For our  

E-Print Network (OSTI)

ICT 2008 1 Abstract Microscale Thermoelectric Cooling Elements (TECs) are being proposed to cool performance characteristics that relate the cooling power density to other control variables and material act as a good guideline for two-dimensional analysis and assembly of TECs. Key Words - Thermoelectric

90

Thermal behavior in the LENS process  

SciTech Connect

Direct laser metal deposition processing is a promising manufacturing technology which could significantly impact the length of time between initial concept and finished part. For adoption of this technology in the manufacturing environment, further understanding is required to ensure robust components with appropriate properties are routinely fabricated. This requires a complete understanding of the thermal history during part fabrication and control of this behavior. This paper will describe research to understand the thermal behavior for the Laser Engineered Net Shaping (LENS) process, where a component is fabricated by focusing a laser beam onto a substrate to create a molten pool in which powder particles are simultaneously injected to build each layer. The substrate is moved beneath the laser beam to deposit a thin cross section, thereby creating the desired geometry for each layer. After deposition of each layer, the powder delivery nozzle and focusing lens assembly is incremented in the positive Z-direction, thereby building a three dimensional component layer additively. It is important to control the thermal behavior to reproducibly fabricate parts. The ultimate intent is to monitor the thermal signatures and to incorporate sensors and feedback algorithms to control part fabrication. With appropriate control, the geometric properties (accuracy, surface finish, low warpage) as well as the materials` properties (e.g., strength, ductility) of a component can be dialed into the part through the fabrication parameters. Thermal monitoring techniques will be described, and their particular benefits highlighted. Preliminary details in correlating thermal behavior with processing results will be discussed.

Griffith, M.L.; Schlienger, M.E.; Harwell, L.D. [and others

1998-08-01T23:59:59.000Z

91

Seismic Array Software System  

E-Print Network (OSTI)

Seismic Array Software System Sam Irvine, Martin Lukac,of a Portable Broadband Seismic Array Long - • Part of theStudy the propagation of seismic waves in Mexico City • Line

2005-01-01T23:59:59.000Z

92

Declining Cotton Cultivation in Maricopa County, Arizona: An Examination of Macro and Micro-Scale Driving Forces*  

E-Print Network (OSTI)

Declining Cotton Cultivation in Maricopa County, Arizona: An Examination of Macro and Micro-Scale Driving Forces* Abstract Once the dominant location of cotton cultivation within the state of Arizona within the regional agricultural economy. The dramatic decline in cotton over the last nine years has

Hall, Sharon J.

93

ECI International Conference on Heat Transfer and Fluid Flow in Microscale Whistler, 21-26 September 2008  

E-Print Network (OSTI)

ECI International Conference on Heat Transfer and Fluid Flow in Microscale Whistler, 21] studied convective heat transfer of slug flows in a macro-sized tube by using viscoelastic fluids-26 September 2008 NUMERICAL STUDY ON CONVECTIVE HEAT TRANSFER OF GAS-LIQUID SLUG FLOW IN A MICRO TUBE Qunwu He

Kasagi, Nobuhide

94

Recognition of micro-scale deformation structures in glacial sediments pattern perception, observer bias and the influence of experience  

E-Print Network (OSTI)

Recognition of micro-scale deformation structures in glacial sediments ­ pattern perception structures in glacial sediments ­ pattern perception, observer bias and the influence of experience. Boreas is the micromor- phology of glacial sediments. In this paper we investigate the role of an analyst's experience

Weidemann, Christoph

95

IEEE TRANSACTIONS ON COMPONENTS AND PACKAGING TECHNOLOGIES, VOL. 32, NO. 2, JUNE 2009 447 Temperature Profile Inside Microscale Thermoelectric  

E-Print Network (OSTI)

Temperature Profile Inside Microscale Thermoelectric Module Acquired Using Near-Infrared Thermoreflectance-scale thermoelectric modules. By determining localized sources of Joule heating, one can identify manufacturing errors and generate design rules that can improve the cooling performance of the thermoelectric device. Index Terms

96

Using Job Arrays on Carver  

NLE Websites -- All DOE Office Websites (Extended Search)

on Carver Using Job Arrays on Carver Job Arrays Job arrays are a way to submit many jobs using only 1 batch submission script. The term task arrays is often used in...

97

Thermophotovoltaic Array Optimization  

SciTech Connect

A systematic approach to thermophotovoltaic (TPV) array design and fabrication was used to optimize the performance of a 192-cell TPV array. The systematic approach began with cell selection criteria that ranked cells and then matched cell characteristics to maximize power output. Following cell selection, optimization continued with an array packaging design and fabrication techniques that introduced negligible electrical interconnect resistance and minimal parasitic losses while maintaining original cell electrical performance. This paper describes the cell selection and packaging aspects of array optimization as applied to fabrication of a 192-cell array.

SBurger; E Brown; K Rahner; L Danielson; J Openlander; J Vell; D Siganporia

2004-07-29T23:59:59.000Z

98

Evaporation-Induced Buckling and Fission of Microscale Droplet Interface Bilayers  

SciTech Connect

Droplet interface bilayers (DIBs) are a robust platform for studying synthetic cellular membranes; however, to date no DIBs have been produced at cellular length scales. Here, we create microscale droplet interface bilayers ( DIBs) at the interface between aqueous femtoliter-volume droplets within an oil-filled microfluidic channel. The uniquely large area-to-volume ratio of the droplets results in strong evaporation effects, causing the system to transition through three distinct regimes. First, the two adjacent droplets shrink into the shape of a single spherical droplet, where an augmented lipid bilayer partitions two hemi-spherical volumes. In the second regime, the combined effects of the shrinking monolayers and growing bilayer force the confined bilayer to buckle to conserve its mass. Finally, at a bending moment corresponding to a critical shear stress, the buckling bilayer fissions a vesicle to regulate its shape and stress. The DIBs produced here enable evaporation-induced bilayer dynamics reminiscent of endo- and exocytosis in cells.

Boreyko, Jonathan B [ORNL; Mruetusatorn, Prachya [ORNL; Sarles, Stephen A [ORNL; Retterer, Scott T [ORNL; Collier, Pat [ORNL

2013-01-01T23:59:59.000Z

99

High gradient lens for charged particle beam  

DOE Patents (OSTI)

Methods and devices enable shaping of a charged particle beam. A dynamically adjustable electric lens includes a series of alternating a series of alternating layers of insulators and conductors with a hollow center. The series of alternating layers when stacked together form a high gradient insulator (HGI) tube to allow propagation of the charged particle beam through the hollow center of the HGI tube. A plurality of transmission lines are connected to a plurality of sections of the HGI tube, and one or more voltage sources are provided to supply an adjustable voltage value to each transmission line of the plurality of transmission lines. By changing the voltage values supplied to each section of the HGI tube, any desired electric field can be established across the HGI tube. This way various functionalities including focusing, defocusing, acceleration, deceleration, intensity modulation and others can be effectuated on a time varying basis.

Chen, Yu-Jiuan

2014-04-29T23:59:59.000Z

100

Design and development of a laminated Fresnel lens for point-focus PV systems. Phase II  

SciTech Connect

A laminated glass-plastic lens parquet using injection molded point focus Fresnel lenses is described. The second phase of a program aimed at investigating the cost effectiveness of a glass-plastic concentrator lens assembly is reported. The first phase dealt with the development of a first generation lens design, the selection of the preferred glass coverplate and glass-to-lens adhesive and initial injection molding lens molding trials. The second phase has dealt with the development of an improved lens design, a full size parquet lamination process, and a second group of injection molding lens molding trials.

Hodge, R.C.

1982-12-01T23:59:59.000Z

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


101

Improving an Accuracy of ANN-Based Mesoscale-Microscale Coupling Model by Data Categorization: With Application to Wind Forecast for Offshore and Complex Terrain Onshore Wind Farms  

Science Journals Connector (OSTI)

The ANN-based mesoscale-microscale coupling model forecasts wind speed and wind direction with high accuracy for wind parks located in complex terrain onshore, yet some weather regimes remains unresolved and f...

Alla Sapronova; Catherine Meissner…

2014-01-01T23:59:59.000Z

102

Carbon nanotube nanoelectrode arrays  

DOE Patents (OSTI)

The present invention relates to microelectode arrays (MEAs), and more particularly to carbon nanotube nanoelectrode arrays (CNT-NEAs) for chemical and biological sensing, and methods of use. A nanoelectrode array includes a carbon nanotube material comprising an array of substantially linear carbon nanotubes each having a proximal end and a distal end, the proximal end of the carbon nanotubes are attached to a catalyst substrate material so as to form the array with a pre-determined site density, wherein the carbon nanotubes are aligned with respect to one another within the array; an electrically insulating layer on the surface of the carbon nanotube material, whereby the distal end of the carbon nanotubes extend beyond the electrically insulating layer; a second adhesive electrically insulating layer on the surface of the electrically insulating layer, whereby the distal end of the carbon nanotubes extend beyond the second adhesive electrically insulating layer; and a metal wire attached to the catalyst substrate material.

Ren, Zhifeng (Newton, MA); Lin, Yuehe (Richland, WA); Yantasee, Wassana (Richland, WA); Liu, Guodong (Fargo, ND); Lu, Fang (Burlingame, CA); Tu, Yi (Camarillo, CA)

2008-11-18T23:59:59.000Z

103

Focal plane array with modular pixel array components for scalability  

DOE Patents (OSTI)

A modular, scalable focal plane array is provided as an array of integrated circuit dice, wherein each die includes a given amount of modular pixel array circuitry. The array of dice effectively multiplies the amount of modular pixel array circuitry to produce a larger pixel array without increasing die size. Desired pixel pitch across the enlarged pixel array is preserved by forming die stacks with each pixel array circuitry die stacked on a separate die that contains the corresponding signal processing circuitry. Techniques for die stack interconnections and die stack placement are implemented to ensure that the desired pixel pitch is preserved across the enlarged pixel array.

Kay, Randolph R; Campbell, David V; Shinde, Subhash L; Rienstra, Jeffrey L; Serkland, Darwin K; Holmes, Michael L

2014-12-09T23:59:59.000Z

104

WorldLens: exploring world events through media  

E-Print Network (OSTI)

The goal of WorldLens is to provide a visual answer to the question: "what is happening in the world?" This thesis entails the design and development of a system that provides an exploratory view into world events across ...

Speiser, Jonathan Eliezer

2014-01-01T23:59:59.000Z

105

FIA-14-0082- In the Matter of Len Latkovski  

Energy.gov (U.S. Department of Energy (DOE))

Len Latkovski (the Appellant) appealed a FOIA determination that the DOE Office of Intelligence and Counterintelligence (IN) issued to him in response to a request for documents that he filed under...

106

LED Lighting Freeform Lens for achieving Octagon Spot  

Science Journals Connector (OSTI)

To decreasing the design error caused by the point source model, a method combining freeform and aspherical surface is presented. A LED spotlight lens for realizing octagon spot is...

Shaoyun, Yin; Sun, Xiuhui; Xia, Liangping; Du, Chunlei

107

The Subthermocline Lens D1. Part II: Kinematics and Dynamics  

Science Journals Connector (OSTI)

The dynamics of a subthermocline lens observed during the POLYMODE Local Dynamics Experiment are examined using density data and measurements of the velocity field obtained by an absolute velocity profiler. It is shown that the momentum balance ...

B. A. Elliott; T. B. Sanford

1986-03-01T23:59:59.000Z

108

Nano-lens diffraction around a single heated nano particle  

Science Journals Connector (OSTI)

The action of a nanoscopic spherically symmetric refractive index profile on a focused Gaussian beam may easily be envisaged as the action of a phase-modifying element, i.e. a lens:...

Selmke, Markus; Braun, Marco; Cichos, Frank

2012-01-01T23:59:59.000Z

109

Potential of a beryllium x-ray lens  

SciTech Connect

The use of refractive lenses for focusing x-ray beams has been the subject of publications since the early 1980s. Detailed calculations have been made for different shapes for the refractive lens: cylindrical, spherical, parabolic, and for a Fresnel-type refractive lens. The main drawback to the use of a single refractive lens to focus x-rays is that the index of refraction (n = 1 {minus} {delta}) is very close to 1, which results in a lens with a very long focal length. Recently Snigerov and others have suggested and experimentally demonstrated, using cylindrical-shaped lenses, that this problem of long focal lengths can be overcome by using many lenses in series. Each lens refracts the photon through a small angle, but the sum of these sequential changes in direction can be moderately larger. This increase in effective refraction angle reduces the focal length of the lens to a few meters or less and makes the multi-element lens a much more useful instrument for focusing x-rays. This paper, annualizes the expected performance of a lens consisting of a series of aligned hollow spheres in a beryllium substrate. The use of hollow spheres rather than hollow cylinders produces focusing of the x rays into a small focal spot in contrast to the single-directional focusing of the hollow cylinders, which produces a line focus. Two multi-element lenses have been constructed: one with 20 1-mm-diameter hollow spheres in an aluminum substrate, and one with 50 hollow spheres, 1 mm in diameter, in a beryllium substrate. Some construction details and calculations of the expected performance, are given for these two multi-element lenses.

Smither, R.K.; Khounsary, A.M.; Xu, S. [Argonne National Lab., IL (United States). Advanced Photon Source

1997-09-01T23:59:59.000Z

110

Design, fabrication, and testing of a variable focusing micromirror array lens  

E-Print Network (OSTI)

(silicon nitride) 0.60 Poly-0 (bottom polysilicon layer) 0.50 1st Oxide (sacrificial layer - phosphosilicate glass) 2.0 Poly-1 (middle polysilicon layer) 2.0 2nd Oxide (sacrificial layer - phosphosilicate glass) 0.75 Poly-2 (top polysilicon layer...-layer polycrystalline silicon (polysilicon) process. It is intended for prototyping MEMS, using surface-micromachined thin films on a silicon wafer. MUMPs? offers three patternable layers of polysilicon and two sacrificial layers of phosphosilicate glass on a base...

Cho, Gyoungil

2005-08-29T23:59:59.000Z

111

Improved resolution three-dimensional integral imaging using optimized irregular lens-array structure  

Science Journals Connector (OSTI)

A rigorous approach is proposed to improve the resolution of integral imaging (InI) by finding the appropriate form of irregularity in the arrangement of the InI lenslets. The...

Kavehvash, Zahra; Mehrany, Khashayar; Bagheri, Saeed

2012-01-01T23:59:59.000Z

112

Array for detecting microbes  

DOE Patents (OSTI)

The present embodiments relate to an array system for detecting and identifying biomolecules and organisms. More specifically, the present embodiments relate to an array system comprising a microarray configured to simultaneously detect a plurality of organisms in a sample at a high confidence level.

Andersen, Gary L.; DeSantis, Todd D.

2014-07-08T23:59:59.000Z

113

Control for Actuator Arrays  

Science Journals Connector (OSTI)

Actuator arrays are planar arrangements of simple actuators that cooperate to translate and orient objects. This paper derives the equations of motion for manipulating an object in stick/slip contact with the actuators. A controller derived from kinematics ... Keywords: actuator arrays, distributed control, distributed manipulation, hybrid systems

Mark Bedillion; William Messner

2009-07-01T23:59:59.000Z

114

Gravitational lens equation for embedded lenses; magnification and ellipticity  

SciTech Connect

We give the lens equation for light deflections caused by point mass condensations in an otherwise spatially homogeneous and flat universe. We assume the signal from a distant source is deflected by a single condensation before it reaches the observer. We call this deflector an embedded lens because the deflecting mass is part of the mean density. The embedded lens equation differs from the conventional lens equation because the deflector mass is not simply an addition to the cosmic mean. We prescribe an iteration scheme to solve this new lens equation and use it to compare our results with standard linear lensing theory. We also compute analytic expressions for the lowest order corrections to image amplifications and distortions caused by incorporating the lensing mass into the mean. We use these results to estimate the effect of embedding on strong lensing magnifications and ellipticities and find only small effects, <1%, contrary to what we have found for time delays and for weak lensing, {approx}5%.

Chen, B. [Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, 440 West Brooks, Norman, Oklahoma 73019 (United States); Mathematics Department, University of Oklahoma, 601 Elm Avenue, Norman, Oklahoma 73019 (United States); Kantowski, R.; Dai, X. [Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, 440 West Brooks, Norman, Oklahoma 73019 (United States)

2011-10-15T23:59:59.000Z

115

The focusing properties of the positron-capture solenoidal lens  

SciTech Connect

This note concerns the focusing properties of the positron-capture solenoid. Such a solenoid will be placed before the entrance of the 450 MeV positron linear-accelerator injector in the APS. The 1.25 A, 40 ns electron beam is accelerated in the 200 MeV electron linac. This beam is then focused onto a 3 mm diameter spot at the 7 mm thick tungsten target. By the process of multiple nuclear-scattering the target generates the positron particles. These positrons, in general, can have a large diverging angle. In order to capture these rapidly diverging positrons, a relatively strong focusing lens is placed close to the converter. In this case a magnetic solenoidal lens has an advantage over the usual quadrupole lens because of its larger phase-space acceptance. In particular, the solenoidal lens is noted for its capability of controlling the spin direction of polarized ions. The authors first wrote down the expression for the magnetic field distribution on the axis for the solenoidal lens. From this expression they derive the expressions for the first- and second-order field distributions at any point in the region. They then calculate and compare the focal powers at various distances off the axis. Further, they calculate and include the third- and fourth-order components of the fields and compare them with the previous results. Finally, they briefly consider the particle trajectories through these fields and present the result in terms of the particle motion in phase space.

Yoon, M.; Mavrogenes, G.

1988-06-01T23:59:59.000Z

116

Intelligent field emission arrays  

E-Print Network (OSTI)

Field emission arrays (FEAs) have been studied extensively as potential electron sources for a number of vacuum microelectronic device applications. For most applications, temporal current stability and spatial current ...

Hong, Ching-yin, 1973-

2003-01-01T23:59:59.000Z

117

#LabChat: Science of the Very Fast and Very Small, June 11 at 2 pm EDT |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

#LabChat: Science of the Very Fast and Very Small, June 11 at 2 pm #LabChat: Science of the Very Fast and Very Small, June 11 at 2 pm EDT #LabChat: Science of the Very Fast and Very Small, June 11 at 2 pm EDT June 8, 2012 - 10:17am Addthis Greg Nielson holds a solar cell test prototype with a microscale lens array fastened to it. Together, the cell and lens help create a concentrated photovoltaic unit that when commercialized will revolutionize the way solar energy is collected. | Photo courtesy of Sandia National Lab Greg Nielson holds a solar cell test prototype with a microscale lens array fastened to it. Together, the cell and lens help create a concentrated photovoltaic unit that when commercialized will revolutionize the way solar energy is collected. | Photo courtesy of Sandia National Lab Michael Hess Michael Hess

118

THETRIS: A micro-scale temperature and gas release model for TRISO fuel  

Science Journals Connector (OSTI)

The dominating mechanism in the passive safety of gas-cooled, graphite-moderated, high-temperature reactors (HTRs) is the Doppler feedback effect. These reactor designs are fueled with submillimeter-sized kernels formed into tristructural-isotropic (TRISO) particles that are imbedded in a graphite matrix. The best spatial and temporal representation of the feedback effect is obtained from an accurate approximation of the fuel temperature. Micro-scale models of TRISO particles are necessary in order to obtain accurate predictions during fast transients or when parameters internal to the TRISO are needed. Most accident scenarios in \\{HTRs\\} are characterized by large time constants and slow changes in the fuel and moderator temperature fields. In these situations, a meso-scale, or pebble- and compact-scale, solution provides a good approximation of the fuel temperature as the fission thermal energy transports out of the kernel and into the surrounding matrix with a much shorter time constant. Therefore, in most cases, the matrix can be assumed to be in quasi-static equilibrium with the kernels. These models, however, fail to provide accurate information on the state of the various components of the TRISO during the early stages of transients. Since the coated particles constitute one of the fundamental design barriers for the release of fission products, it becomes important to understand the transient behavior inside this containment system. An explicit TRISO fuel temperature model named THETRIS has been developed and incorporated into the CYNOD–THERMIX-KONVEK suite of coupled codes. The code includes gas-release models that provide a simple predictive capability of the internal pressure during transients. The new model yields similar results to those obtained with other micro-scale fuel models of TRISO particles, but with the added capability to analyze gas release, internal pressure buildup, and effects of a gap in the TRISO. Analysis of bounding benchmark transients yield good agreement with other codes in which the TRISO particles are modeled explicitly. In addition, a sensitivity study of the potential effects on the transient behavior of high-temperature reactors due to the presence of an inter-layer gap is included. Although the formation of a gap occurs under special conditions, its consequences on the dynamic behavior of the reactor can yield responses during fast transients that depart significantly from those in which no gap is present in the model. The new model was applied to an extreme (beyond design basis) scenario in order to observe the behavior of the fuel during a large prompt critical reactivity insertion. Although a large amount of fission energy was deposited rapidly into the fuel, the kernel temperature is shown to stay well below the melting point and the silicon carbide layer remained well below the temperature above which failure is expected to occur. The explicit treatment of the TRISO particle geometry leads to much lower estimations of power peaking during the transient and a greater degree of negative Doppler feedback.

Javier Ortensi; Brian Boer; Abderrafi M. Ougouag

2011-01-01T23:59:59.000Z

119

Fluidic lens of floating oil using round-pot chamber based on electrowetting  

Science Journals Connector (OSTI)

This study presents a liquid lens using electrowetting that employs an oil phase floating in between the conducting fluids. The lens shape has double-sided surfaces and operates with a...

Choi, Hyunhwan; Won, Yonghyub

2013-01-01T23:59:59.000Z

120

Pseudophakic glaucoma and vision loss after clear lens extraction for high myopia  

Science Journals Connector (OSTI)

A myopic 44-year-old man was treated with bilateral clear lens extraction and posterior chamber intraocular lens implantation. A year later, the patient noted decreased vision in the right eye and was diagnose...

John S. King MD; W. Brad Priester MD; Peter A. Netland MD; PhD

2004-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

Stability, unfolding, and aggregation of the gamma D and gamma S human eye lens crystallins  

E-Print Network (OSTI)

The transparency of the human eye lens depends on the properties of the a- crystallin and py-crystallin families of proteins, which accumulate to very high concentrations in mature lens fiber cells. The 0- and y-crystallins ...

Mills-Henry, Ishara Amenti Rakem

2007-01-01T23:59:59.000Z

122

Extended wearing trial of Trifield lens device for tunnel vision  

E-Print Network (OSTI)

Extended wearing trial of Trifield lens device for �tunnel vision� Russell L. Woods1 , Robert G rehabilitation device for tunnel vision in an extended wearing trial. Twelve patients with tunnel vision (5­22° wide) due to retinitis pigmentosa or choroideremia participated in the 5-visit wearing trial. To expand

Peli, Eli

123

STUDY PROTOCOL Open Access Occupational cataracts and lens opacities in  

E-Print Network (OSTI)

in populations exposed to lower doses. Interventional cardiologists are repeatedly and acutely exposed Registration: NCT01061463 Background Although the sensitivity of the lens of the eye to high doses of ionizing is available at the end of the article Jacob et al. BMC Public Health 2010, 10:537 http

Boyer, Edmond

124

Gravitational lens modelling in a citizen science context  

E-Print Network (OSTI)

We develop a method to enable collaborative modelling of gravitational lenses and lens candidates, that could be used by non-professional lens enthusiasts. It uses an existing free-form modelling program (glass), but enables the input to this code to be provided in a novel way, via a user-generated diagram that is essentially a sketch of an arrival-time surface. We report on an implementation of this method, SpaghettiLens, which has been tested in a modelling challenge using 29 simulated lenses drawn from a larger set created for the Space Warps citizen science strong lens search. We find that volunteers from this online community asserted the image parities and time ordering consistently in some lenses, but made errors in other lenses depending on the image morphology. While errors in image parity and time ordering lead to large errors in the mass distribution, the enclosed mass was found to be more robust: the model-derived Einstein radii found by the volunteers were consistent with those produced by one of...

Küng, Rafael; More, Anupreeta; Baeten, Elisabeth; Coles, Jonathan; Cornen, Claude; Macmillan, Christine; Marshall, Phil; More, Surhud; Odermatt, Jonas; Verma, Aprajita; Wilcox, Julianne K

2015-01-01T23:59:59.000Z

125

Potential of support vector regression for optimization of lens system  

Science Journals Connector (OSTI)

Abstract Lens system design is an important factor in image quality. The main aspect of the lens system design methodology is the optimization procedure. Since optimization is a complex, non-linear task, soft computing optimization algorithms can be used. There are many tools that can be employed to measure optical performance, but the spot diagram is the most useful. The spot diagram gives an indication of the image of a point object. In this paper, the spot size radius is considered an optimization criterion. Intelligent soft computing scheme Support Vector Regression (SVR) is implemented. In this study, the polynomial and radial basis functions (RBF) are applied as the SVR kernel function to estimate the optimal lens system parameters. The performance of the proposed estimators is confirmed with the simulation results. The SVR results are then compared with other soft computing techniques. According to the results, a greater improvement in estimation accuracy can be achieved through the SVR with polynomial basis function compared to other soft computing methodologies. The SVR coefficient of determination R 2 with the polynomial function was 0.9975 and with the radial basis function the R 2 was 0.964. The new optimization methods benefit from the soft computing capabilities of global optimization and multi-objective optimization rather than choosing a starting point by trial and error and combining multiple criteria into a single criterion in conventional lens design techniques.

Torki A. Altameem; Vlastimir Nikoli?; Shahaboddin Shamshirband; Dalibor Petkovi?; Hossein Javidnia; Miss Laiha Mat Kiah; Abdullah Gani

2015-01-01T23:59:59.000Z

126

Making sense of climate change risks and responses at the community level: A cultural-political lens  

Science Journals Connector (OSTI)

Abstract How to better assess, communicate and respond to risks from climate change at the community level have emerged as key questions within climate risk management. Recent research to address these questions centres largely on psychological factors, exploring how cognition and emotion lead to biases in risk assessment. Yet, making sense of climate change and its responses at the community level demands attention to the cultural and political processes that shape how risk is conceived, prioritized and managed. I review the emergent literature on risk perceptions and responses to climate change using a cultural-political lens. This lens highlights how knowledge, meaning and power are produced and negotiated across multiple stakeholders at the community level. It draws attention to the different ways of constructing climate change risks and suggests an array of responses at the community level. It further illustrates how different constructions of risk intersect with agency and power to shape the capacity for response and collective action. What matters are whose constructions of risk, and whose responses, count in decision-making. I argue for greater engagement with the interpretive social sciences in research, practice and policy. The interpretive social sciences offer theories and tools for capturing and problematising the ways of knowing, sense-making and mobilising around risks from climate change. I also highlight the importance of participatory approaches in incorporating the multiplicity of interests at the community level into climate risk management in fair, transparent and culturally appropriate ways.

Ainka A. Granderson

2014-01-01T23:59:59.000Z

127

Microphone array exploratory study  

Science Journals Connector (OSTI)

In the field of acoustic signal processing one of the most popular areas of research is that of microphone arrays. As a small research project in this field a microphone array system with adjustable polar response will be developed. It is worth noting that this submission is more a research proposal than an abstract. This research will take part as a means of combining coursework and research for courses in engineering acoustics and real-time digital signal processing at the University of Miami. Before any arrays are physically constructed or any code written on a DSP simulations will be performed in MATLAB to determine optimum array configurations and to analyze various DSP algorithms for adjusting polar responses. Then using a Texas Instruments TMS320C6713 DSP on a DSK audio target board and writing code in C Assembly and MATLAB physical tests will be conducted to analyze performance of design. A MEMS microphone model will likely be used for its small size and low cost. From there results will be analyzed and further research in the area proposed.

Marc Messier

2013-01-01T23:59:59.000Z

128

The Cosmic Lens All-Sky Survey:II. Gravitational lens candidate selection and follow-up  

E-Print Network (OSTI)

We report the final results of the search for gravitationally lensed flat-spectrum radio sources found in the combination of CLASS (Cosmic Lens All Sky Survey) and JVAS (Jodrell-Bank VLA Astrometric Survey). VLA observations of 16,503 sources have been made, resulting in the largest sample of arcsec-scale lens systems available. Contained within the 16,503 sources is a complete sample of 11,685 sources having two-point spectral indices between 1.4 and 5 GHz flatter than -0.5 and 5 GHz flux densities $\\geq$30 mJy. A subset of 8,958 sources form a well-defined statistical sample suitable for analysis of the lens statistics. We describe the systematic process by which 149 candidate lensed sources were picked from the statistical sample on the basis of possessing multiple compact components in the 0.2 arcsec-resolution VLA maps. Candidates were followed up with 0.05 arcsec resolution MERLIN and 0.003 arcsec VLBA observations at 5 GHz and rejected as lens systems if they failed well-defined surface brightness and/or morphological tests. Maps for all the candidates can be found on the World Wide Web at http://www.jb.man.ac.uk/research/gravlens/index.html We summarize the properties of each of the 22 gravitational lens systems in JVAS/CLASS. Twelve are double-image systems, nine are four-image systems and one is a six-image system. Thirteen constitute a statistically well-defined sample giving a point-source lensing rate of 1:690$\\pm$190. The interpretation of the results in terms of the properties of the lensing galaxy population and cosmological parameters will be published elsewhere. (Abridged)

I. W. A. Browne; P. N. Wilkinson; N. J. F. Jackson; S. T. Myers; C. D. Fassnacht; L. V. E. Koopmans; D. R. Marlow; M. Norbury; D. Rusin; C. M. Sykes; A. D. Biggs; R. D. Blandford; A. G. de Bruyn; K-H. Chae; P. Helbig; L. J. King; J. P. McKean; T. J. Pearson; P. M. Phillips; A. C. S. Readhead; E. Xanthopoulos; T. York

2002-11-04T23:59:59.000Z

129

Abstract-Some insight as to the application of modern electric drive expertise to micro-scale electric machines is given.  

E-Print Network (OSTI)

Abstract- Some insight as to the application of modern electric drive expertise to micro-scale electric machines is given. The discussion is supported by a summary of current micromotor technology) that considerable insight from drives experts can be offered in either case. I. INTRODUCTION Some 100 years

Chapman, Patrick

130

A Nested Micro-Scale Simulation of a Lake Michigan Land-Breeze Front Gijs de Boer,Gregory J.Tripoli,Edwin W.Eloranta  

E-Print Network (OSTI)

A Nested Micro-Scale Simulation of a Lake Michigan Land-Breeze Front Gijs de Boer,Gregory J Positioning of the 6 Nested Grids Acknowledgements Introduction As part of the Lake Induced Convection of a more easily predictable large scale pattern. Compared to mesoscale simulations,which often nest down

Eloranta, Edwin W.

131

Lens spaces in the Regge calculus approach to quantum cosmology  

Science Journals Connector (OSTI)

We study the wave function for a universe which is topologically a lens space within the Regge calculus approach. By restricting the four-dimensional simplicial complex to be a cone over the boundary lens space, described by a single internal edge length, and a single boundary edge length, one can analyze in detail the analytic properties of the action in the space of complex edge lengths. The classical extrema and convergent steepest descent contours of integration yielding the wave function are found. Both the Hartle-Hawking- and Linde-Vilenkin-type proposals are examined and, in all cases, we find wave functions which predict a Lorentzian oscillatory behavior in the late universe. The behavior of the results under subdivision of the boundary universe is also presented.

Danny Birmingham

1995-11-15T23:59:59.000Z

132

A Fisheye Lens as a Photonic Doppler Velocimetry Probe  

SciTech Connect

These presentation visuals report an instrument that, by use of a fish-eye lens, generates a beat signal using fiber mixing of unshifted light with Doppler-shifted light and measures the beat frequency. Ray trace diagrams are shown to illustrate advantages and disadvantages. The authors find their instrument has a long tracking distance, and large angle coverage. Index matching eases assembly, reduces return loss and flattens the field.

Frogget, B. C.

2012-08-16T23:59:59.000Z

133

Solid state neutron detector array  

DOE Patents (OSTI)

A neutron detector array is capable of measuring a wide range of neutron fluxes. The array includes multiple semiconductor neutron detectors. Each detector has a semiconductor active region that is resistant to radiation damage. In one embodiment, the array preferably has a relatively small size, making it possible to place the array in confined locations. The ability of the array to detect a wide range of neutron fluxes is highly advantageous for many applications such as detecting neutron flux during start up, ramp up and full power of nuclear reactors.

Seidel, John G. (Pittsburgh, PA); Ruddy, Frank H. (Monroeville, PA); Brandt, Charles D. (Mount Lebanon, PA); Dulloo, Abdul R. (Pittsburgh, PA); Lott, Randy G. (Pittsburgh, PA); Sirianni, Ernest (Monroeville, PA); Wilson, Randall O. (Greensburg, PA)

1999-01-01T23:59:59.000Z

134

Carbon Nanotubes Based Nanoelectrode Arrays: Fabrication, Evaluation...  

NLE Websites -- All DOE Office Websites (Extended Search)

Arrays: Fabrication, Evaluation and Application in Voltammetric Analysis. Carbon Nanotubes Based Nanoelectrode Arrays: Fabrication, Evaluation and Application in Voltammetric...

135

Testing and selecting dark energy models with lens redshift data  

Science Journals Connector (OSTI)

In this paper, we compare seven popular dark energy models under the assumption of a flat universe by using the latest observational data of gravitationally-lensed image separations observed in the Cosmic Lens All-Sky Survey (CLASS), the PMN-NVSS Extragalactic Lens Survey (PANELS), the Sloan Digital Sky Survey (SDSS) and other surveys, which are (nearly) complete for the image separation range 0??.3????7??. We combine the 29 lens redshift data with the cosmic microwave background (CMB) observation from the Wilkinson Microwave Anisotropy Probe (WMAP7) results, the baryonic acoustic oscillation (BAO) observation from the spectroscopic Sloan Digital Sky Survey (SDSS) Data Release. The model comparison statistic, the Bayesian information criterion is also applied to assess the worth of the models. This statistic favors models that give a good fit with fewer parameters. Based on this analysis, we find that the simplest cosmological constant model that has only one free parameter is still preferred by the current data. For the other dynamical dark energy models, we find that some of them, such as the Ricci dark energy model, the Affine equation-of-state dark energy, and the generalized Chaplygin gas, can provide good fits to the current data. The Dvali-Gabadadze-Porrati model is the only one-parameter model that can give a rather good fit but also nest ? while the three-parameter model, namely, the interactive dark energy, is clearly disfavored by the data, as it is unable to provide a good fit.

Shuo Cao; Zong-Hong Zhu; Ren Zhao

2011-07-07T23:59:59.000Z

136

Constraints on Scalar-Field Dark Energy from the Cosmic Lens All-Sky Survey Gravitational Lens Statistics  

E-Print Network (OSTI)

We use the statistics of strong gravitational lensing based on the Cosmic Lens All-Sky Survey (CLASS) data to constrain cosmological parameters in a spatially-flat, inverse power-law potential energy density, scalar-field dark energy cosmological model. The lensing-based constraints are consistent with, but weaker than, those derived from Type Ia supernova redshift-magnitude data, and mildly favor the Einstein cosmological constant limit of this dark energy model.

Kyu-Hyun Chae; Gang Chen; Bharat Ratra; Dong-Wook Lee

2004-03-10T23:59:59.000Z

137

The Sloan Digital Sky Survey Quasar Lens Search. IV. Statistical Lens Sample from the Fifth Data Release  

SciTech Connect

We present the second report of our systematic search for strongly lensed quasars from the data of the Sloan Digital Sky Survey (SDSS). From extensive follow-up observations of 136 candidate objects, we find 36 lenses in the full sample of 77,429 spectroscopically confirmed quasars in the SDSS Data Release 5. We then define a complete sample of 19 lenses, including 11 from our previous search in the SDSS Data Release 3, from the sample of 36,287 quasars with i < 19.1 in the redshift range 0.6 < z < 2.2, where we require the lenses to have image separations of 1 < {theta} < 20 and i-band magnitude differences between the two images smaller than 1.25 mag. Among the 19 lensed quasars, 3 have quadruple-image configurations, while the remaining 16 show double images. This lens sample constrains the cosmological constant to be {Omega}{sub {Lambda}} = 0.84{sub -0.08}{sup +0.06}(stat.){sub -0.07}{sup + 0.09}(syst.) assuming a flat universe, which is in good agreement with other cosmological observations. We also report the discoveries of 7 binary quasars with separations ranging from 1.1 to 16.6, which are identified in the course of our lens survey. This study concludes the construction of our statistical lens sample in the full SDSS-I data set.

Inada, Naohisa; /Wako, RIKEN /Tokyo U., ICEPP; Oguri, Masamune; /Natl. Astron. Observ. of Japan /Stanford U., Phys. Dept.; Shin, Min-Su; /Michigan U. /Princeton U. Observ.; Kayo, Issha; /Tokyo U., ICRR; Strauss, Michael A.; /Princeton U. Observ.; Hennawi, Joseph F.; /UC, Berkeley /Heidelberg, Max Planck Inst. Astron.; Morokuma, Tomoki; /Natl. Astron. Observ. of Japan; Becker, Robert H.; /LLNL, Livermore /UC, Davis; White, Richard L.; /Baltimore, Space Telescope Sci.; Kochanek, Christopher S.; /Ohio State U.; Gregg, Michael D.; /LLNL, Livermore /UC, Davis /Exeter U.

2010-05-01T23:59:59.000Z

138

Fiber optic coupling of a microlens conditioned, stacked semiconductor laser diode array  

DOE Patents (OSTI)

The output radiation from the two-dimensional aperture of a semiconductor laser diode array is efficiently coupled into an optical fiber. The two-dimensional aperture is formed by stacking individual laser diode bars on top of another in a "rack and stack" configuration. Coupling into the fiber is then accomplished using individual microlenses to condition the output radiation of the laser diode bars. A lens that matches the divergence properties and wavefront characteristics of the laser light to the fiber optic is used to focus this conditioned radiation into the fiber.

Beach, Raymond J. (Livermore, CA); Benett, William J. (Livermore, CA); Mills, Steven T. (Antioch, CA)

1997-01-01T23:59:59.000Z

139

Lensmem a gravitational lens inversion algorithm using the maximum entropy method  

E-Print Network (OSTI)

We present a new algorithm for inverting poorly resolved gravitational lens systems using the maximum entropy method (MEM). We test the method with simulations and then apply it to an 8 GHz VLA map of the radio ring lens MG1654+134. We model the lens as a singular isothermal sphere embedded in an external shear field and find the critical radius of the lens is b=0\\parcs9820, the dimensionless shear is \\gamma=0.0771, and the position angle of the shear is \\theta=100\\pdeg8. These results are consistent with the results obtained by Kochanek (1995) using a complementary inversion algorithm based on Clean.

Wallington, S; Narayan, R

1995-01-01T23:59:59.000Z

140

E-Print Network 3.0 - adult chicken lens Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

shown). Second column: after removal of the lens... reflexes when chickens were refrac- ted through the lenses and it is clear ... Source: Glasser, Adrian - College of Optometry,...

Note: This page contains sample records for the topic "microscale lens array" 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 - acrylic intraocular lens Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

imaging Bachelor of Technology in Engineering Physics, Indian Institute... , Electromagnetism, Nonlinear optics, Quantum mechanics, Microscopy, Nano-optics, Eye design, Lens...

142

E-Print Network 3.0 - accommodating intraocular lens Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

during the process of accommodation. Waveguidance in Photonic Bandgap... , Electromagnetism, Nonlinear optics, Quantum mechanics, Microscopy, Nano-optics, Eye design, Lens...

143

E-Print Network 3.0 - accommodative intraocular lens Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

during the process of accommodation. Waveguidance in Photonic Bandgap... , Electromagnetism, Nonlinear optics, Quantum mechanics, Microscopy, Nano-optics, Eye design, Lens...

144

Zoned near-zero refractive index fishnet lens antenna: Steering millimeter waves  

SciTech Connect

A zoned fishnet metamaterial lens is designed, fabricated, and experimentally demonstrated at millimeter wavelengths to work as a negative near-zero refractive index lens suitable for compact lens antenna configurations. At the design frequency f?=?56.7?GHz (?{sub 0}?=?5.29?mm), the zoned fishnet metamaterial lens, designed to have a focal length FL?=?9?{sub 0}, exhibits a refractive index n?=??0.25. The focusing performance of the diffractive optical element is briefly compared with that of a non-zoned fishnet metamaterial lens and an isotropic homogeneous zoned lens made of a material with the same refractive index. Experimental and numerically-computed radiation diagrams of the fabricated zoned lens are presented and compared in detail with that of a simulated non-zoned lens. Simulation and experimental results are in good agreement, demonstrating an enhancement generated by the zoned lens of 10.7?dB, corresponding to a gain of 12.26?dB. Moreover, beam steering capability of the structure by shifting the feeder on the xz-plane is demonstrated.

Pacheco-Peña, V., E-mail: victor.pacheco@unavarra.es; Orazbayev, B., E-mail: b.orazbayev@unavarra.es; Beaskoetxea, U., E-mail: unai.beaskoetxea@unavarra.es; Beruete, M., E-mail: miguel.beruete@unavarra.es [TERALAB (MmW—THz—IR and Plasmonics Laboratory), Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona (Spain); Navarro-Cía, M., E-mail: m.navarro@imperial.ac.uk [Optical and Semiconductor Devices Group, Department of Electrical and Electronic Engineering, Imperial College London, London SW7 2BT (United Kingdom); Centre for Plasmonics and Metamaterials, Imperial College London, London SW7 2AZ (United Kingdom); Centre for Terahertz Science and Engineering, Imperial College London, London SW7 2AZ (United Kingdom)

2014-03-28T23:59:59.000Z

145

Light harvesting arrays  

DOE Patents (OSTI)

A light harvesting array useful for the manufacture of devices such as solar cells comprises: (a) a first substrate comprising a first electrode; and (b) a layer of light harvesting rods electrically coupled to the first electrode, each of the light harvesting rods comprising a polymer of Formula I: X.sup.1.paren open-st.X.sup.m+1).sub.m (I) wherein m is at least 1, and may be from two, three or four to 20 or more; X.sup.1 is a charge separation group (and preferably a porphyrinic macrocycle, which may be one ligand of a double-decker sandwich compound) having an excited-state of energy equal to or lower than that of X.sup.2, and X.sup.2 through X.sup.m+1 are chromophores (and again are preferably porphyrinic macrocycles).

Lindsey, Jonathan S. (Raleigh, NC)

2002-01-01T23:59:59.000Z

146

Telecentric Zoom Lens Designed for the Cygnus X-Ray Source  

SciTech Connect

Cygnus is a high-energy radiographic x-ray source. Three large zoom lenses have been assembled to collect images from large scintillators. A large elliptical pellicle (394 × 280 mm) deflects the scintillator light out of the x-ray path into an eleven-element zoom lens coupled to a CCD camera. The zoom lens and CCD must be as close as possible to the scintillator to maximize light collection. A telecentric lens design minimizes image blur from a volume source. To maximize the resolution of objects of different sizes, the scintillator and zoom lens are translated along the x-ray axis, and the zoom lens magnification changes. Zoom magnification is also changed when different-sized recording cameras are used (50 or 62 mm square format). The LYSO scintillator measures 200 × 200 mm and is 5 mm thick. The scintillator produces blue light peaking at 435 nm, so special lens materials are required. By swapping out one doublet and allowing all other lenses to be repositioned, the zoom lens can also use a CsI(Tl) scintillator that produces green light centered at 540 nm. All lenses have an anti-reflective coating for both wavelength bands. Two sets of doublets, the stop, the scintillator, and the CCD camera move during zoom operations. One doublet has x?y compensation. Each zoom lens uses 60 lb of glass inside the 425 lb mechanical structure and can be used in either a vertical or horizontal orientation.

Malone, R. M. [NSTec; Baker, S. A. [NSTec; Brown, K. K. [NSTec; Curtis, A. H. [NSTec; Esquibel, D. L. [NSTec; Frayer, D. K. [NSTec; Frogget, B. C. [NSTec; Frogget, K. G. [NSTec; Kaufman, M. I. [NSTec; Smith, A. S. [NSTec; Tibbitts, A. [NSTec; Howe, R. A. [NSTec; Huerta, J. A. [NSTec; McGillivray, K. D. [NSTec; Droemer, D. W. [NSTec; Crain, M. D. [NSTec; Haines, T. J. [LANL; King, S. P. [LANL

2013-07-01T23:59:59.000Z

147

Beating the Bubble: Using Kinematic Triggering in the Bubble Lens for Acquiring Small, Dense Targets  

E-Print Network (OSTI)

Beating the Bubble: Using Kinematic Triggering in the Bubble Lens for Acquiring Small, Dense Seattle, WA 98195 USA {memott, wobbrock}@uw.edu ABSTRACT We present the Bubble Lens, a new target acquisition technique that remedies the limitations of the Bubble Cursor to increase the speed and accuracy

Wobbrock, Jacob O.

148

Electrical Conductivity, Near-Infrared Absorption, and Thermal Lens Spectroscopic Studies of Percolation of Microemulsions  

E-Print Network (OSTI)

Electrical Conductivity, Near-Infrared Absorption, and Thermal Lens Spectroscopic Studies studied below and above the percolation thresholds by electrical conductivity, near-infrared absorption. In this work the structure of microemulsions was investigated by using the near-IR absorption and thermal lens

Reid, Scott A.

149

Developing Supersonic Impactor and Aerodynamic Lens for Separation and Handling of Nano-Sized Particles  

SciTech Connect

A computational model for supersonic flows of compressible gases in an aerodynamic lens with several lenses and in a supersonic/hypersonic impactor was developed. Airflow conditions in the aerodynamic lens were analyzed and contour plots for variation of Mach number, velocity magnitude and pressure field in the lens were evaluated. The nano and micro-particle trajectories in the lens and their focusing and transmission efficiencies were evaluated. The computational model was then applied to design of a aerodynamic lens that could generate focus particle beams while operating under atmospheric conditions. The computational model was also applied to airflow condition in the supersonic/hypersonic impactor. Variations of airflow condition and particle trajectories in the impactor were evaluated. The simulation results could provide understanding of the performance of the supersonic and hypersonic impactors that would be helpful for the design of such systems.

Goodarz Ahmadi

2008-06-30T23:59:59.000Z

150

Three-dimensional isotropic perfect lens based on LC-loaded transmission lines  

E-Print Network (OSTI)

An isotropic three-dimentional perfect lens based on cubic meshes of interconnected transmission lines and bulk loads is proposed. The lens is formed by a slab of a loaded mesh placed in between two similar unloaded meshes. The dispersion equations and the characteristic impedances of the eigenwaves in the meshes are derived analytically, with an emphasis on generality. This allows designing of transmission-line meshes with desired dispersion properties. The required backward-wave mode of operation in the lens is realized with simple inductive and capacitive loads. An analytical expression for the transmission through the lens is derived and the amplification of evanescent waves is demonstrated. Factors that influence enhancement of evanescent waves in the lens are studied and the corresponding design criteria are established. A possible realization of the structure is outlined.

P. Alitalo; S. Maslovski; S. Tretyakov

2005-09-16T23:59:59.000Z

151

Laser Densification of Micro-Optical Arrays  

Science Journals Connector (OSTI)

Optical microlens arrays are important in many optical systems. A new method for producing arrays of negative lenses, geodesic lenses, and planar GRIN lenses is described. The lenses and arrays are produced us...

T. Chia; L. L. Hench

1994-01-01T23:59:59.000Z

152

Self-fabrication of void array in fused silica by femtosecond laser processing  

SciTech Connect

We demonstrate self-fabrication of a submicrometer-sized void array in fused silica using a 100 fs 0.2-3 {mu}J Ti:Sapphire femtosecond laser and a high 0.9 numerical aperture (NA) objective lens. The effect of the focusing conditions of NA, laser energy, and pulse number on the shape of the fabricated void was investigated. The void has a linearly drawn shape in the direction of the laser irradiation when a single pulse is irradiated and an increasing number of incident pulses resulted in the break up of the long void into multiple spherical ones, leading to a periodically aligned void array. The void shape also varied with the depth of the focus point beneath the fused silica surface, because the amount of self-focusing has a significant effect on the generation of the voids. The void shape was narrower and longer when the laser pulse was focused with the higher NA (up to 0.9) objective lens in the deeper position (up to 70 {mu}m) in the fused silica.

Toratani, Eiji; Kamata, Masanao; Obara, Minoru [Department of Electronics and Electrical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522 (Japan)

2005-10-24T23:59:59.000Z

153

The Submillimeter Array Polarimeter  

E-Print Network (OSTI)

We describe the Submillimeter Array (SMA) Polarimeter, a polarization converter and feed multiplexer installed on the SMA. The polarimeter uses narrow-band quarter-wave plates to generate circular polarization sensitivity from the linearly-polarized SMA feeds. The wave plates are mounted in rotation stages under computer control so that the polarization handedness of each antenna is rapidly selectable. Positioning of the wave plates is found to be highly repeatable, better than 0.2 degrees. Although only a single polarization is detected at any time, all four cross correlations of left- and right-circular polarization are efficiently sampled on each baseline through coordinated switching of the antenna polarizations in Walsh function patterns. The initial set of anti-reflection coated quartz and sapphire wave plates allows polarimetry near 345 GHz; these plates have been have been used in observations between 325 and 350 GHz. The frequency-dependent cross-polarization of each antenna, largely due to the variation with frequency of the retardation phase of the single-element wave plates, can be measured precisely through observations of bright point sources. Such measurements indicate that the cross-polarization of each antenna is a few percent or smaller and stable, consistent with the expected frequency dependence and very small alignment errors. The polarimeter is now available for general use as a facility instrument of the SMA.

Daniel P. Marrone; Ramprasad Rao

2008-07-14T23:59:59.000Z

154

The Double Quasar 0957+561: Examination of the Gravitational Lens Hypothesis Using the Very Large Array  

Science Journals Connector (OSTI)

...NATURE 279 : 381 ( 1979 ). WEYMANN, R.J., MULTIPLE-MIRROR TELESCOPE OBSERVATIONS OF THE TWIN QSOS 0957+561-A,B...variations between the images. One of the classic consequences of Schwarzschild radius and b is the dis-general relativity is the bending...

P. E. GREENFIELD; D. H. ROBERTS; B. F. BURKE

1980-05-02T23:59:59.000Z

155

Areal array jetting device for ball grid arrays  

SciTech Connect

Package designs for microelectronics devices have moved from through-hole to surface mount technology in order to increase the printed wiring board real estate available by utilizing both sides of the board. The traditional geometry for surface mount devices is peripheral arrays where the leads are on the edges of the device. As the technology drives towards high input/output (I/O) count (increasing number of leads) and smaller packages with finer pitch (less distance between peripheral leads), limitations on peripheral surface mount devices arise. A solution to the peripheral surface mount issue is to shift the leads to the area under the device. This scheme is called areal array packaging and is exemplified by the ball grid array (BGA) package. In a BGA package, the leads are on the bottom surface of the package in the form of an array of solder balls. The current practice of joining BGA packages to printed wiring boards involves a hierarchy of solder alloy compositions. A high melting temperature ball is typically used for standoff. A promising alternative to current methods is the use of jetting technology to perform monolithic solder ball attachment. This paper describes an areal array jetter that was designed and built to simultaneously jet arrays of solder balls directly onto BGA substrates.

Frear, D.R.; Yost, F.G.; Schmale, D.T.; Essien, M.

1997-08-01T23:59:59.000Z

156

A gradient index sonic lens based on acoustic metamaterials  

Science Journals Connector (OSTI)

We report a method to design and characterize broadband gradient index lenses. The lenses are based on two?dimensional sonic crystals which are periodic arrangements of elastic cylinders embedded in air. It will be shown that gradient index sonic lenses built with rigid cylinders are more powerful than conventionally curved lenses. We also demonstrate that the designing possibilities increased by considering the mixture of two types of cylinders in the sonic crystal. So a gradient index lens with zero reflectance at the surface is proposed by employing a mixture of aerogel and rigid cylinders. Finally a multiple scatteringtheory has been employed to compare the performance of conventionally curved lenses and gradient index lenses. [Work supported by MEC of Spain and GVA of Valencia.

José Sánchez?Dehesa; Daniel Torrent

2007-01-01T23:59:59.000Z

157

Metamaterial lens of specifiable frequency-dependent focus and adjustable aperture for electron cyclotron emission in the DIII-D tokamak  

E-Print Network (OSTI)

Electron Cyclotron Emission (ECE) of different frequencies originates at different locations in non-uniformly magnetized plasmas. For simultaneous observation of multiple ECE frequencies from the outside edge of a toroidal plasma confinement device (e.g. a tokamak), the focal length of the collecting optics should increase with the frequency to maximize the resolution on a line of sight along the magnetic field gradient. Here we present the design and numerical study of a zoned metamaterial lens with such characteristics, for possible deployment with the 83-130 GHz ECE radiometer in the DIII-D tokamak. The lens consists of a concentric array of miniaturized element phase-shifters. These were reverse-engineered starting from the desired Gaussian beam waist locations and further optimized to account for diffraction and finite-aperture effects that tend to displace the waist. At the same time we imposed high and uniform transmittance, averaged over all phase-shifters. The focal length is shown to increase from 1...

Hammond, K C; Massidda, S D; Volpe, F A

2014-01-01T23:59:59.000Z

158

Duality in Josephson Junction Arrays  

E-Print Network (OSTI)

Various properties of mesoscopic two-dimensional Josephson junction arrays are reviewed. Particular attention is paid to structure of the topological excitations, charges and vortices, which are shown to be dual to each other. This duality persists in the presence of external magnetic fields and offset charges, which influence vortices and charges in an equivalent way. A double-layer junction array is also considered, where an even further reaching duality is discovered.

Ya. M. Blanter; Rosario Fazio; Gerd Schoen

1997-01-30T23:59:59.000Z

159

Fast algorithms for triangular Josephson junction arrays  

SciTech Connect

We develop fast algorithms for the numerical study of two-dimensional triangular Josephson junction arrays. The Dirac bra-ket formalism is introduced in the context of such arrays. We note that triangular arrays can have both hexagonal and rectangular periodicity and develop algorithms for each. Boundaries are next introduced and fast algorithms for finite arrays are developed. 40 refs., 4 figs.

Datta, S.; Sahdev, D. [Indian Institute of Technology, Kanpur (India)] [Indian Institute of Technology, Kanpur (India)

1997-04-01T23:59:59.000Z

160

FIA-12-0024 - In the matter of Len Latkovski | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

24 - In the matter of Len Latkovski 24 - In the matter of Len Latkovski FIA-12-0024 - In the matter of Len Latkovski Len Latkovski ("Appellant") filed an Appeal from a determination issued by the Department of Energy (DOE) Office of Information Resources (OIR). In that determination, OIR responded to a request for information that the Appellant filed under the Freedom of Information Act (FOIA), 5 U.S.C. § 552, as implemented by the DOE in 10 C.F.R. Part 1004. This Appeal, if granted, would require OIR to perform an additional search and require other DOE offices to search for responsive documents. FIA-12-0024.pdf More Documents & Publications FIA-12-0073 - In the Matter of Larry W. Long FIA-13-0040 - In the Matter of DeShonne E. Massey Sr. FIA-13-0021 - In the Matter of Caldera Pharmaceuticals, Inc.

Note: This page contains sample records for the topic "microscale lens array" 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

Energy-Saving Bottom-Lit LED Backlight with Angle-Control Freeform Lens  

Science Journals Connector (OSTI)

In this paper, relation of transmittance of prism sheets used in bottom-lit LED backlight on the direction of incident light was studied. Freeform lens was utilized to enhance the...

Qin, Zong; Wang, Kai; Wang, Shang; Liu, Sheng

162

Biomechanics of the Lens Capsule from Native to After Cataract Surgery  

E-Print Network (OSTI)

quasispherical morphology to change focus from distant to near objects. Given its highly mechanical nature, it is prudent to study the native lens capsule from the perspective of biomechanics for such applications as understanding the mechanism of accommodation...

Pedrigi, Ryan M.

2010-01-16T23:59:59.000Z

163

Reply to comment on Perfect drain for the Maxwell fish eye lens  

E-Print Network (OSTI)

We reply to the comments on our paper Perfect Drain for the Maxwell fish eye lens (NJP 13 (2011) 023038) made by Fei Sun. We believe that Sun comments have several mistakes in theoretical concepts and simulation results.

Gonzalez, Juan C; Minnano, Juan C; Grabovickic, Dejan

2013-01-01T23:59:59.000Z

164

Thermal lens effect in solar-pumped high-power solid-state lasers  

Science Journals Connector (OSTI)

The thermal lens effect in the Nd:YAG laser rods pumped with a concentrated solar flux of the Big Solar Furnace of the NPO Fizika-Solntse of...

S. A. Bakhramov; Sh. D. Paiziev; Sh. I. Klychev; A. K. Kasimov…

2007-09-01T23:59:59.000Z

165

The Coronal Plasma “pushing” the focus of the gravity + plasma lens far beyond 550 AU  

Science Journals Connector (OSTI)

The gravitational lens of the Sun still needs more study. In fact, above the surface of the Sun, the Corona extends into space across distances that are comparable with the Sun radius, and the coronal effects ...

2009-01-01T23:59:59.000Z

166

In-situ microscale through-silicon via strain measurements by synchrotron x-ray microdiffraction exploring the physics behind data interpretation  

SciTech Connect

In-situ microscale thermomechanical strain measurements have been performed in combination with synchrotron x-ray microdiffraction to understand the fundamental cause of failures in microelectronics devices with through-silicon vias. The physics behind the raster scan and data analysis of the measured strain distribution maps is explored utilizing the energies of indexed reflections from the measured data and applying them for beam intensity analysis and effective penetration depth determination. Moreover, a statistical analysis is performed for the beam intensity and strain distributions along the beam penetration path to account for the factors affecting peak search and strain refinement procedure.

Liu, Xi [The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States); School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States); Thadesar, Paragkumar A.; Oh, Hanju; Bakir, Muhannad S. [School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States); Taylor, Christine L.; Sitaraman, Suresh K. [The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States); Kunz, Martin; Tamura, Nobumichi [Advanced Light Source, Lawrence Berkeley National Laboratory Berkeley, California 94720 (United States)

2014-09-15T23:59:59.000Z

167

Alignment and Testing of a Telecentric Zoom Lens Used for the Cygnus X-ray Source  

SciTech Connect

Cygnus is a high-energy radiographic x-ray source. Three large zoom lenses have been assembled to collect images from large scintillators. A large elliptical pellicle (394 × 280 mm) deflects the scintillator light out of the x-ray path into an eleven-element zoom lens coupled to a CCD camera. The zoom lens and CCD must be as close as possible to the scintillator to maximize light collection. A telecentric lens design minimizes image blur from a volume source. To maximize the resolution of objects of different sizes, the scintillator and zoom lens are translated along the x-ray axis, and the zoom lens magnification changes. Zoom magnification is also changed when different-sized recording cameras are used (50 or 62 mm square format). The LYSO scintillator measures 200 × 200 mm and is 5 mm thick. The scintillator produces blue light peaking at 435 nm, so special lens materials are required. By swapping out one doublet and allowing all other lenses to be repositioned, the zoom lens can also use a CsI(Tl) scintillator that produces green light centered at 540 nm (for future operations). All lenses have an anti-reflective coating for both wavelength bands. Two sets of doublets, the stop, the scintillator, and the CCD camera move during zoom operations. One doublet has x-y compensation. Alignment of the optical elements was accomplished using counter propagating laser beams and monitoring the retro-reflections and steering collections of laser spots. Each zoom lens uses 60 lb of glass inside the 425 lb mechanical structure, and can be used in either vertical or horizontal orientation.

Malone, R. M. [NSTec; Baker, S. A. [NSTec; Brown, K. K. [NSTec; Castaneda, J. J. [NSTec; Curtis, A. H. [NSTec; Danielson, J. [NSTec; Droemer, D. W. [NSTec; Esquibel, D. L. [NSTec; Haines, T. J. [LANL; Hollabaugh, J. S. [NSTec; Howe, R. A. [NSTec; Huerta, J. A. [NSTec; King, N. S. P. [LANL; Lutz, S. S. [NSTec; Kaufman, M. I. [NSTec; McGillivray, K. D. [NSTec; Smith, A. D. [NSTec; Stokes, B. M. [NSTec; Tibbitts, A. [NSTec

2013-09-01T23:59:59.000Z

168

Design of a lens table for a double toroidal electron spectrometer  

SciTech Connect

We report here on the method we developed to build a lens table for a four-element electrostatic transfer lens operated together with a double toroidal electron energy analyzer designed by one of us, and whose original design and further improvements are described in detail in Miron et al. [Rev. Sci. Instrum. 68, 3728 (1997)] and Le Guen et al. [Rev. Sci. Instrum. 73, 3885 (2002)]. Both computer simulations and laboratory instrument tuning were performed in order to build this lens table. The obtained result was tested for a broad range of electron kinetic energies and analyzer pass energies. Based on this new lens table, allowing to easily computer control the spectrometer working conditions, we could routinely achieve an electron energy resolution ranging between 0.6% and 0.8% of the analyzer pass energy, while the electron count rate was also significantly improved. The establishment of such a lens table is of high importance to relieve experimentalists from the tedious laboring of the lens optimization, which was previously necessary prior to any measurement. The described method can be adapted to any type of electron/ion energy analyzer, and will thus be interesting for all experimentalists who own, or plan to build or improve their charged particle energy analyzers.

Liu Xiaojng; Nicolas, Christophe; Miron, Catalin [Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex (France)

2013-03-15T23:59:59.000Z

169

Computerized method and system for designing an aerodynamic focusing lens stack  

DOE Patents (OSTI)

A computerized method and system for designing an aerodynamic focusing lens stack, using input from a designer related to, for example, particle size range to be considered, characteristics of the gas to be flowed through the system, the upstream temperature and pressure at the top of a first focusing lens, the flow rate through the aerodynamic focusing lens stack equivalent at atmosphere pressure; and a Stokes number range. Based on the design parameters, the method and system determines the total number of focusing lenses and their respective orifice diameters required to focus the particle size range to be considered, by first calculating for the orifice diameter of the first focusing lens in the Stokes formula, and then using that value to determine, in iterative fashion, intermediate flow values which are themselves used to determine the orifice diameters of each succeeding focusing lens in the stack design, with the results being output to a designer. In addition, the Reynolds numbers associated with each focusing lens as well as exit nozzle size may also be determined to enhance the stack design.

Gard, Eric (San Francisco, CA); Riot, Vincent (Oakland, CA); Coffee, Keith (Diablo Grande, CA); Woods, Bruce (Livermore, CA); Tobias, Herbert (Kensington, CA); Birch, Jim (Albany, CA); Weisgraber, Todd (Brentwood, CA)

2011-11-22T23:59:59.000Z

170

E-Print Network 3.0 - arrays electrode array Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

results for: arrays electrode array Page: << < 1 2 3 4 5 > >> 1 IMPROVED PLANAR PDMS PATCH ELECTRODE ARRAY Kathryn Greene Klemic, Xiaohui Li, James F Klemic, Mark A Reed, Fred J...

171

Phenotype MicroArray Profiling  

NLE Websites -- All DOE Office Websites (Extended Search)

MicroArray MicroArray Profiling of Zymomonas mobilis ZM4 Barry Bochner & Vanessa Gomez & Michael Ziman & Shihui Yang & Steven D. Brown Received: 22 May 2009 / Accepted: 26 October 2009 # The Author(s) 2009. This article is published with open access at Springerlink.com Abstract In this study, we developed a Phenotype MicroArray(tm) (PM) protocol to profile cellular phenotypes in Zymomonas mobilis, which included a standard set of nearly 2,000 assays for carbon, nitrogen, phosphorus and sulfur source utilization, nutrient stimulation, pH and osmotic stresses, and chemical sensitivities with 240 inhibitory chemicals. We observed two positive assays for C-source utilization (fructose and glucose) using the PM screen, which uses redox chemistry and cell respiration as a universal reporter to profile growth phenotypes in a high-throughput 96-well plate-based format.

172

micro-scales | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

on the substrate. Because they flatten less upon impaction, particles with higher viscosity and surface tension can be identified by a steeper slope on a plot of TCA vs. size....

173

A Microscale Exsolution Investigation  

E-Print Network (OSTI)

be transported to a shallower depth, where the CO2 would come out of solution (exsolve), forming a mobile CO2 gas large volumes of brine to become saturated with dissolved CO2 at concentrations of 50 g/l or more. As CO-term storage security of the CO2 because the denser brine is less likely to move upwards towards shallower

Stanford University

174

Microscale acceleration history discriminators  

DOE Patents (OSTI)

A new class of micromechanical acceleration history discriminators is claimed. These discriminators allow the precise differentiation of a wide range of acceleration-time histories, thereby allowing adaptive events to be triggered in response to the severity (or lack thereof) of an external environment. Such devices have applications in airbag activation, and other safety and surety applications.

Polosky, Marc A. (Albuquerque, NM); Plummer, David W. (Albuquerque, NM)

2002-01-01T23:59:59.000Z

175

Method to fabricate hollow microneedle arrays  

DOE Patents (OSTI)

An inexpensive and rapid method for fabricating arrays of hollow microneedles uses a photoetchable glass. Furthermore, the glass hollow microneedle array can be used to form a negative mold for replicating microneedles in biocompatible polymers or metals. These microneedle arrays can be used to extract fluids from plants or animals. Glucose transport through these hollow microneedles arrays has been found to be orders of magnitude more rapid than natural diffusion.

Kravitz, Stanley H. (Placitas, NM); Ingersoll, David (Albuquerque, NM); Schmidt, Carrie (Los Lunas, NM); Flemming, Jeb (Albuquerque, NM)

2006-11-07T23:59:59.000Z

176

Proceedings: EPRI Second Phased Array Inspection Seminar  

SciTech Connect

The Second EPRI Phased Array Inspection Seminar focused on industrial applications of phased array technology that have been achieved to date or are planned for the near future. Presentations were made by developers of inspection techniques, inspection services vendors, and utility personnel who have performed inspections using arrays.

None

2001-11-01T23:59:59.000Z

177

High voltage load resistor array  

DOE Patents (OSTI)

A high voltage resistor comprising an array of a plurality of parallel electrically connected resistor elements each containing a resistive solution, attached at each end thereof to an end plate, and about the circumference of each of the end plates, a corona reduction ring. Each of the resistor elements comprises an insulating tube having an electrode inserted into each end thereof and held in position by one or more hose clamps about the outer periphery of the insulating tube. According to a preferred embodiment, the electrode is fabricated from stainless steel and has a mushroom shape at one end, that inserted into the tube, and a flat end for engagement with the end plates that provides connection of the resistor array and with a load.

Lehmann, Monty Ray (Smithfield, VA)

2005-01-18T23:59:59.000Z

178

Microsoft PowerPoint - eLens status Anerella 091112.pptx  

NLE Websites -- All DOE Office Websites (Extended Search)

September 11, 2012 September 11, 2012 1 eLens - Assembly Magnet #1 - Cold Mass Assembly * end plate mods complete (FT/TVW) * End plate, tube closure welding underway * Heat shield installation next * Pressure / leak check testing afterwards Magnet #2 - Cold Test Assembly: Magnet #2 Cold Test Assembly * Testing continues 2 E-Lens Magnet Drawings, Parts M t Magnet * Design work continues - (SP/SS/FC) *insertion assy (38010200) - check print complete *cryostatted assy (38060200) - check print complete cryostatted assy (38060200) check print complete *electro-mechanical assy (38060406) - in checking *e-lens top assy (38060001) - in checking *Insertion fixture additions - complete, parts order in CS (SS) C d * Cryostats inspected? * heat shields sent to CS for final end cutouts, fittings welded ASAP * (some) Cryostat parts in CS, supporting schedule

179

Measurement of Gravitational Lens Time Delays with LSST (SULI Paper)  

SciTech Connect

The proposed Large Synoptic Survey Telescope will be the first to explore multiple dark energy probes simultaneously, including baryon acoustic oscillations, weak lensing, and strong gravitational lensing. The large data sample, covering the entire visible sky every few nights, will allow an unprecedented survey of deep supernova sources and their lensed images. The latter have not yet been observed. Notably, LSST will measure the time delays between different strong-lensed images of the same supernova. This will provide a unique probe of dark matter, dark energy, and the expansion rate of the Universe. By simulating LSST observations under realistic conditions, we determined the time delay precision of multiple images from a representative strong-lensed Type Ia supernova. The output of the simulation was a set of light curves according to field and filter, which were subsequently analyzed to determine the experimental time delays. We find that a time delay precision of better then 10% can be achieved under suitable conditions. Firstly, a minimum observed peak-magnitude of 22 is required for the lensed image, corresponding to an intrinsic source magnitude of about 24. The number of such supernova sources expected for LSST is under investigation, but it could amount to several thousand. Secondly, a minimum of about 50 visits per field is required, and, moreover, these visits must be evenly distributed over the duration of the event. The visit frequency should be approximately once per week, or better. Thirdly, the sky brightness should be below 21 magnitude arcsec{sup -2} to allow sufficient sensitivity to distance sources. Under the nominal LSST visiting schedule and field conditions, 15% of all fields satisfy these criteria, and allow time delay measurements of better than 10% precision. This performance can be further improved by fitting the predicted supernova light curves to the observations, rather than using the simple weighted mean as in the present study. Of the well-measured fields, 85% involve observations taken with the r filter, which has a wavelength acceptance that is well-matched to supernova spectra. This filter therefore represents the best choice for strong gravitational lens observations with LSST. Our primary conclusion is that the visiting schedule is the single most important parameter to optimize for time delay measurements, and, once a lensed supernova has been detected, that frequent, regular observations should be scheduled to search with the highest sensitivity for multiple, delayed lensed images.

Kirkby, Lowry Anna; /Oxford U. /SLAC

2006-01-04T23:59:59.000Z

180

Definition: PV array | Open Energy Information  

Open Energy Info (EERE)

PV array PV array Jump to: navigation, search Dictionary.png PV array An interconnected system of PV modules that function as a single electricity-producing unit. In smaller systems, an array can consist of a single module.[1][2] View on Wikipedia Wikipedia Definition A Photovoltaic system (informally, PV system) is an arrangement of components designed to supply usable electric power for a variety of purposes, using the Sun (or, less commonly, other light sources) as the power source. PV systems may be built in various configurations: Off-grid without battery (Array-direct) Off-grid with battery storage for DC-only appliances Off-grid with battery storage for AC & DC appliances Grid-tie without battery Grid-tie with battery storage A photovoltaic array (also called a solar array) consists of multiple photovoltaic modules, casually

Note: This page contains sample records for the topic "microscale lens array" 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

High-Resolution UV Relay Lens for Particle Size Distribution Measurements Using Holography  

SciTech Connect

Shock waves passing through a metal sample can produce ejecta particulates at a metal-vacuum interface. Holography records particle size distributions by using a high-power, short-pulse laser to freeze particle motion. The sizes of the ejecta particles are recorded using an in-line Fraunhofer holography technique. Because the holographic plate would be destroyed in an energetic environment, a high-resolution lens has been designed to relay the interference fringes to a safe environment. Particle sizes within a 12-mm-diameter, 5-mm-thick volume are recorded onto holographic film. To achieve resolution down to 0.5 ?m, ultraviolet laser (UV) light is needed. The design and assembly of a nine-element lens that achieves >2000 lp/mm resolution and operates at f/0.89 will be described. To set up this lens system, a doublet lens is temporarily attached that enables operation with 532-nm laser light and 1100 lp/mm resolution. Thus, the setup and alignment are performed with green light, but the dynamic recording is done with UV light. During setup, the 532-nm beam provides enough focus shift to accommodate the placement of a resolution target outside the ejecta volume; this resolution target does not interfere with the calibrated wires and pegs surrounding the ejecta volume. A television microscope archives images of resolution patterns that prove that the calibration wires, interference filter, holographic plate, and relay lenses are in their correct positions. Part of this lens is under vacuum, at the point where the laser illumination passes through a focus. Alignment and tolerancing of this high-resolution lens will be presented, and resolution variation through the 5-mm depth of field will be discussed.

Malone, Robert M.; Capelle, Gene A.; Frogget, Brent C.; Grover, Mike; Kaufman, Morris I.; Pazuchanics, Peter; Sorenson, Danny S.; Stevens, Gerald D.; Tibbits, Aric; Turley, William D.

2008-08-29T23:59:59.000Z

182

Coated carbon nanotube array electrodes  

DOE Patents (OSTI)

The present invention provides conductive carbon nanotube (CNT) electrode materials comprising aligned CNT substrates coated with an electrically conducting polymer, and the fabrication of electrodes for use in high performance electrical energy storage devices. In particular, the present invention provides conductive CNTs electrode material whose electrical properties render them especially suitable for use in high efficiency rechargeable batteries. The present invention also provides methods for obtaining surface modified conductive CNT electrode materials comprising an array of individual linear, aligned CNTs having a uniform surface coating of an electrically conductive polymer such as polypyrrole, and their use in electrical energy storage devices.

Ren, Zhifeng (Newton, MA); Wen, Jian (Newton, MA); Chen, Jinghua (Chestnut Hill, MA); Huang, Zhongping (Belmont, MA); Wang, Dezhi (Wellesley, MA)

2008-10-28T23:59:59.000Z

183

?Magnetotransport of magnetite nanoparticle arrays  

Science Journals Connector (OSTI)

We combine a material self-assembly with conventional lithographic processes in order to fabricate magnetoelectronic devices composed of ordered three-dimensional arrays of magnetite (Fe3O4) nanoparticles. The device magnetoresistance reaches 35% at 60 K, corresponding to an electron spin polarization of 73%. Magnetoresistance of 12% remains at room temperature. Magnetoresistance decreases with both increasing temperature and bias voltage, however, the magnetoresistance of nanoparticle-based structures is only weakly dependent on the voltage—a favorable attribute for application to electronics.

Hao Zeng; C. T. Black; R. L. Sandstrom; P. M. Rice; C. B. Murray; Shouheng Sun

2006-01-03T23:59:59.000Z

184

THE SL2S GALAXY-SCALE LENS SAMPLE. III. LENS MODELS, SURFACE PHOTOMETRY, AND STELLAR MASSES FOR THE FINAL SAMPLE  

SciTech Connect

We present Hubble Space Telescope (HST) imaging data and Canada-France-Hawaii Telescope (CFHT) near-infrared ground-based images for the final sample of 56 candidate galaxy-scale lenses uncovered in the CFHT Legacy Survey as part of the Strong Lensing in the Legacy Survey project. The new images are used to perform lens modeling, measure surface photometry, and estimate stellar masses of the deflector early-type galaxies (ETGs). Lens modeling is performed on the HST images (or CFHT when HST is not available) by fitting the spatially extended light distribution of the lensed features assuming a singular isothermal ellipsoid mass profile and by reconstructing the intrinsic source light distribution on a pixelized grid. Based on the analysis of systematic uncertainties and comparison with inference based on different methods, we estimate that our Einstein radii are accurate to ?3%. HST imaging provides a much higher success rate in confirming gravitational lenses and measuring their Einstein radii than CFHT imaging does. Lens modeling with ground-based images, however, when successful, yields Einstein radius measurements that are competitive with space-based images. Information from the lens models is used together with spectroscopic information from companion Paper IV to classify the systems, resulting in a final sample of 39 confirmed (grade A) lenses and 17 promising candidates (grade B,C). This represents an increase of half an order of magnitude in sample size with respect to the sample of confirmed lenses studied in Papers I and II. The Einstein radii of the confirmed lenses in our sample span the range 5-15 kpc and are typically larger than those of other surveys, probing the mass in regions where the dark matter contribution is more important. Stellar masses are in the range 10{sup 11}-10{sup 12} M{sub ?}, covering the range of massive ETGs. The redshifts of the main deflector span a range 0.3 ? z{sub d} ? 0.8, which nicely complements low-redshift samples like the Sloan Lens ACS survey and thus provides an excellent sample for the study of the cosmic evolution of the mass distribution of ETGs over the second half of the history of the universe.

Sonnenfeld, Alessandro; Suyu, Sherry H.; Treu, Tommaso [Physics Department, University of California, Santa Barbara, CA 93106 (United States); Gavazzi, Raphaël [Institut d'Astrophysique de Paris, UMR7095 CNRS-Université Pierre et Marie Curie, 98bis bd Arago, F-75014 Paris (France); Marshall, Philip J., E-mail: sonnen@physics.ucsb.edu [Department of Physics, University of Oxford, Keble Road, Oxford, OX1 3RH (United Kingdom)

2013-11-10T23:59:59.000Z

185

Space and power efficient hybrid counters array  

DOE Patents (OSTI)

A hybrid counter array device for counting events. The hybrid counter array includes a first counter portion comprising N counter devices, each counter device for receiving signals representing occurrences of events from an event source and providing a first count value corresponding to a lower order bits of the hybrid counter array. The hybrid counter array includes a second counter portion comprising a memory array device having N addressable memory locations in correspondence with the N counter devices, each addressable memory location for storing a second count value representing higher order bits of the hybrid counter array. A control device monitors each of the N counter devices of the first counter portion and initiates updating a value of a corresponding second count value stored at the corresponding addressable memory location in the second counter portion. Thus, a combination of the first and second count values provide an instantaneous measure of number of events received.

Gara, Alan G. (Mount Kisco, NY); Salapura, Valentina (Chappaqua, NY)

2010-03-30T23:59:59.000Z

186

Dynamics of Flagellum- and Pilus-Mediated Association of Pseudomonas aeruginosa with Contact Lens Surfaces  

Science Journals Connector (OSTI)

...REFERENCES 1. Arora, S. K. , B. W. Ritchings, E. C. Almira...including high dk continuous wear silicone hydrogels: a new and...lenses surfaces before and after wear using atomic force microscopy...associated with contact lens wear. Invest. Ophthalmol. Vis...

Victoria B. Tran; Suzanne M. J. Fleiszig; David J. Evans; Clayton J. Radke

2011-04-15T23:59:59.000Z

187

Targeted Genomic Deletion of the Lens-Specific Intermediate Filament Protein CP49  

E-Print Network (OSTI)

Targeted Genomic Deletion of the Lens-Specific Intermediate Filament Protein CP49 Azita Alizadeh,1, by blocking expression of the fiber cell­specific beaded filament protein CP49. METHODS. The first exon of the mouse CP49 gene was deleted by using targeted genomic deletion techniques. Gene deletion was assessed

Clark, John

188

A focusing-geometry small-angle neutron scattering instrument with a magnetic neutron lens  

Science Journals Connector (OSTI)

A focusing-geometry small-angle neutron scattering (FSANS) instrument with a magnetic neutron lens based on an extended Halbach-type sextupole magnet has been constructed and tested. A minimum value of the measurable range, , of ?-1 could be achieved by the FSANS instrument using a neutron wavelength ? with for the full width at half maximum.

Oku, T.

2007-02-23T23:59:59.000Z

189

Improving the lens design and performance of a contemporary electromagnetic shock wave lithotripter  

Science Journals Connector (OSTI)

...measurements, uncertainty in numerical model results is 5% at minimum (4). The 3D shape of the acoustic lens was designed using Autodesk Inventor CAD software and then exported to MasterCam (CNC Software), where the material removal machining motions were programmed...

Andreas Neisius; Nathan B. Smith; Georgy Sankin; Nicholas John Kuntz; John Francis Madden; Daniel E. Fovargue; Sorin Mitran; Michael Eric Lipkin; Walter Neal Simmons; Glenn M. Preminger; Pei Zhong

2014-01-01T23:59:59.000Z

190

Dynamics of Flagellum- and Pilus-Mediated Association of Pseudomonas aeruginosa with Contact Lens Surfaces  

Science Journals Connector (OSTI)

...lenses surfaces before and after wear using atomic force microscopy...initial event in sorption of marine bacteria to surfaces. J. Gen...associated with contact lens wear. Invest. Ophthalmol. Vis...Influence of day and night wear on surface properties of silicone...

Victoria B. Tran; Suzanne M. J. Fleiszig; David J. Evans; Clayton J. Radke

2011-04-15T23:59:59.000Z

191

Creating a stereoscopic magic-lens to improve depth perception in handheld augmented reality  

Science Journals Connector (OSTI)

Handheld Augmented Reality (AR) is often presented using the magic-lens paradigm where the handheld device is portrayed as if it was transparent. Such a virtual transparency is usually implemented using video captured by a single camera rendered on the ... Keywords: binocular disparity, depth perception, handheld, mobile, parallax, stereoscopic rendering, user study, virtual transparency

Klen ?opi? Pucihar; Paul Coulton; Jason Alexander

2013-08-01T23:59:59.000Z

192

Folding, stability and aggregation of the long-lived eye lens protein human gamma D crystallin  

E-Print Network (OSTI)

Human [gamma]D crystallin (H[gamma]D-Crys) is a monomeric, two domain, primarily P-sheet protein found in high concentrations in the human eye lens. H[gamma]D-Crys and other crystallins are found in insoluble protein ...

Flaugh, Shannon L

2006-01-01T23:59:59.000Z

193

Optimization of composite tubes for a thermal optical lens housing design  

E-Print Network (OSTI)

and the manufacturing of a carbon fiber reinforced tube in an epoxy resin matrix. This structure intends to serve as the optical lens housing onboard a spacecraft. In addition, some future work needs to be done before this component is certified. The objective...

Garcia Gonzalez, Hector Camerino

2004-09-30T23:59:59.000Z

194

Near-infrared thermal lens spectrometer based on an erbium-doped fiber amplifier and  

E-Print Network (OSTI)

Near-infrared thermal lens spectrometer based on an erbium-doped fiber amplifier and an acousto, guanosine, and thymidine is described. © 1997 Optical Society of America Key words: Near infrared, thermal measurements of absorption in the near-IR region has been developed. In this instrument the near-IR excitation

Reid, Scott A.

195

Aerogel detector with a Fresnel lens focalization: a test of the concept  

SciTech Connect

We present a threshold aerogel detector that uses only the unscattered light in the aerogel, focused on a photomultiplier using a Fresnel lens. The results with n = 1.03 and 3'' photomultiplier are presented. The possibility to use 1.5'' PMT is discussed.

Sokolov, O.; Paic, G. [Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico (Mexico); Alfaro, R. [Instituto de Fisica, Universidad Nacional Autonoma de Mexico (Mexico)

2008-07-02T23:59:59.000Z

196

Microfabricated wire arrays for Z-pinch.  

SciTech Connect

Microfabrication methods have been applied to the fabrication of wire arrays suitable for use in Z. Self-curling GaAs/AlGaAs supports were fabricated as an initial route to make small wire arrays (4mm diameter). A strain relief structure that could be integrated with the wire was designed to allow displacements of the anode/cathode connections in Z. Electroplated gold wire arrays with integrated anode/cathode bus connections were found to be sufficiently robust to allow direct handling. Platinum and copper plating processes were also investigated. A process to fabricate wire arrays on any substrate with wire thickness up to 35 microns was developed. Methods to handle and mount these arrays were developed. Fabrication of wire arrays of 20mm diameter was demonstrated, and the path to 40mm array fabrication is clear. With some final investment to show array mounting into Z hardware, the entire process to produce a microfabricated wire array will have been demonstrated.

Spahn, Olga Blum; Rowen, Adam M.; Cich, Michael Joseph; Peake, Gregory Merwin; Arrington, Christian L.; Nash, Thomas J.; Klem, John Frederick; Romero, Dustin Heinz

2008-10-01T23:59:59.000Z

197

Mesa Top Photovoltaic Array (Fact Sheet)  

SciTech Connect

Fact sheet overview of the Mesa Top Photovoltaic Array project implemented by the Department of Energy Golden Office and National Renewable Energy Laboratory.

Not Available

2009-07-01T23:59:59.000Z

198

Design, Assembly, and Testing of the Neutron Imaging Lens for the National Ignition Facility  

SciTech Connect

The National Ignition Facility will begin testing DT fuel capsules yielding greater than 10^13 neutrons during 2010. Neutron imaging is an important diagnostic for understanding capsule behavior. Neutrons are imaged at a scintillator after passing through a pinhole. The pixelated, 160-mm square scintillator is made up of ¼ mm diameter rods 50 mm long. Shielding and distance (28 m) are used to preserve the recording diagnostic hardware. Neutron imaging is light starved. We designed a large nine-element collecting lens to relay as much scintillator light as reasonable onto a 75 mm gated microchannel plate (MCP) intensifier. The image from the intensifier’s phosphor passes through a fiber taper onto a CCD camera for digital storage. Alignment of the pinhole and tilting of the scintillator is performed before the relay lens and MCP can be aligned. Careful tilting of the scintillator is done so that each neutron only passes through one rod (no crosstalk allowed). The 3.2 ns decay time scintillator emits light in the deep blue, requiring special glass materials. The glass within the lens housing weighs 26 lbs, with the largest element being 7.7 inches in diameter. The distance between the scintillator and the MCP is only 27 inches. The scintillator emits light with 0.56 NA and the lens collects light at 0.15 NA. Thus, the MCP collects only 7% of the available light. Baffling the stray light is a major concern in the design of the optics. Glass cost considerations, tolerancing, and alignment of this lens system will be discussed.

Malone, Robert M; Fatherley, Valerie E; Frogget, Brent C; Grim, Gary P; Kaufman, Morris I; McGillivray, Kevin D; Oertel, John A; Palagi, Martin J; Skarda, William K; Tibbitts, Aric; Wilde, Carl H

2010-09-01T23:59:59.000Z

199

E-Print Network 3.0 - array format 20khz Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

3 Computation Visualization Summary: . . . . . . . . . . . . . . . . . . 6 Version 5 MATLAB Array Data Element Formats . . . .10 Numeric Array and Character Array Data... Element...

200

Array Converter | Open Energy Information  

Open Energy Info (EERE)

Converter Converter Jump to: navigation, search Name Array Converter Place Sunnyvale, California Zip 94086 Product US manufacturer of micro-inverters. Coordinates 32.780338°, -96.547405° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":32.780338,"lon":-96.547405,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

Note: This page contains sample records for the topic "microscale lens array" 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

Miniaturized electron-impact-ionization pumps using double-gated isolated vertically aligned carbon nanotube arrays  

E-Print Network (OSTI)

There is a need for microscale vacuum pumps that can be readily integrated with other MEMS and electronic components at the chip-scale level. Miniaturized ion pumps exhibit favorable scaling down because they are surface-limited ...

Jayanty, Vivi

2012-01-01T23:59:59.000Z

202

Path Delay Test Through Memory Arrays  

E-Print Network (OSTI)

Memory arrays cannot be as easily tested as other storage elements in a chip. Most of the flip-flops (FFs) in a chip can be replaced by scan cells in scan-based design. However, the bits in memory arrays cannot be replaced by scan cells, due...

Pokharel, Punj

2013-07-29T23:59:59.000Z

203

E-Print Network 3.0 - array based system Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

set, it indicates the array is used... . . . . . . . . . . . . . . . . . . 6 Version 5 MATLAB Array Data Element Formats . . . .10 Numeric Array and Character Array Data... Element...

204

Solar Array Ventures Inc | Open Energy Information  

Open Energy Info (EERE)

Inc Inc Jump to: navigation, search Name Solar Array Ventures Inc Place Austin, Texas Product Texas-based start-up thin film PV panel maker, which plans to develop five production plants over the next five years, with four of those facilities located at a site in New Mexico. References Solar Array Ventures Inc[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Solar Array Ventures Inc is a company located in Austin, Texas . References ↑ "Solar Array Ventures Inc" Retrieved from "http://en.openei.org/w/index.php?title=Solar_Array_Ventures_Inc&oldid=351246" Categories: Clean Energy Organizations Companies Organizations Stubs What links here Related changes

205

Diffraction-Limited Constant-Resolution Zoom Lens Across Multi-Wavelengths for the Advanced Technology Solar Telescope  

Science Journals Connector (OSTI)

Constant-resolution is needed over a wide spectral range (388nm to 805 nm) for CCD sampling. The zoom lens, consisting of eleven elements, yields a diffraction limited image at nine...

An, Hyun Kyoung; Pitalo, Stephen K

206

Characterization of an aerodynamic lens for transmitting particles greater than 1 micrometer in diameter into the Aerodyne aerosol mass spectrometer  

E-Print Network (OSTI)

We have designed and characterized a new inlet and aerodynamic lens for the Aerodyne aerosol mass spectrometer (AMS) that transmits particles between 80 nm and more than 3 ?m in vacuum aerodynamic diameter. The design of ...

Williams, L. R.

207

Optical design of a Butterfly lens for a street light based on a double-cluster LED  

Science Journals Connector (OSTI)

We construct a precise optical model of the cluster LED and propose a design of a peanut form lens to achieve an optical utilization factor of 45% and uniformity of 1/2.7. Then we propose a new design of so-called Butterfly lens with unequal tilt design aimed to serve a double-cluster LED but with a tightened size. The optical utilization factor of the Butterfly lens is about 43.8%, the uniformity is around 1/2.7, and an averaged illuminance of 14 lx, which could meet almost all types requested by IESNA. The design of the Butterfly lens is proven workable for a double-cluster LED.

Yi-Chien Lo; Kuan-Teng Huang; Xuan-Hao Lee; Ching-Cherng Sun

2012-01-01T23:59:59.000Z

208

Non-Invasive Early Detection and Molecular Analysis of Low X-ray Dose Effects in the Lens  

SciTech Connect

This is the Final Progress Report for DOE-funded research project DE-PS02-08ER08-01 titled “Non-Invasive Early Detection and Molecular Analysis of Low X-ray Dose Effects in the Lens”. The project focuses on the effects of low-linear energy transfer (LET) radiation on the ocular lens. The lens is an exquisitely radiosensitive tissue with a highly-ordered molecular structure that is amenable to non-invasive optical study from the periphery. These merits point to the lens as an ideal target for laser-based molecular biodosimetry (MBD). Following exposure to different types of ionizing radiations, the lens demonstrates molecular changes (e.g., oxidation, racemization, crosslinkage, truncation, aggregation, etc.) that impact the structure and function of the long-lived proteins in the cytosol of lens fiber cells. The vast majority of proteins in the lens comprise the highly-ordered crystallins. These highly conserved lens proteins are amongst the most concentrated and stable in the body. Once synthesized, the crystallins are retained in the fiber cell cytoplasm for life. Taken together, these properties point to the lens as an ideal system for quantitative in vivo MBD assessment using quasi-elastic light scattering (QLS) analysis. In this project, we deploy a purpose-designed non-invasive infrared laser QLS instrument as a quantitative tool for longitudinal assessment of pre-cataractous molecular changes in the lenses of living mice exposed to low-dose low-LET radiation compared to non-irradiated sham controls. We hypothesize that radiation exposure will induce dose-dependent changes in the molecular structure of matrix proteins in the lens. Mechanistic assays to ascertain radiation-induced molecular changes in the lens focus on protein aggregation and gene/protein expression patterns. We anticipate that this study will contribute to our understanding of early molecular changes associated with radiation-induced tissue pathology. This study also affords potential for translational development of molecular biodosimetry instrumentation to assess human exposure to mixed radiation fields.

Goldstein, Lee [Boston University] [Boston University

2014-07-02T23:59:59.000Z

209

Demonstration of electron beam focusing by a laser-plasma lens  

E-Print Network (OSTI)

Laser-plasma technology promises a drastic reduction of the size of high energy electron accelerators. It could make free electron lasers available to a broad scientific community, and push further the limits of electron accelerators for high energy physics. Furthermore the unique femtosecond nature of the source makes it a promising tool for the study of ultra-fast phenomena. However, applications are hindered by the lack of suitable lens to transport this kind of high-current electron beams, mainly due to their divergence. Here we show that this issue can be solved by using a laser-plasma lens, in which the field gradients are five order of magnitude larger than in conventional optics. We demonstrate a reduction of the divergence by nearly a factor of three, which should allow for an efficient coupling of the beam with a conventional beam transport line.

Thaury, Cédric; Döpp, Andreas; Lehe, Remi; Lifschitz, Agustin; Phuoc, Kim Ta; Gautier, Julien; Goddet, Jean-Philippe; Tafzi, Amar; Flacco, Alessandro; Tissandier, Fabien; Sebban, Stéphane; Rousse, Antoine; Malka, Victor

2014-01-01T23:59:59.000Z

210

Einzel lens chopper and behavior of the chopped beam in the KEK digital accelerator  

Science Journals Connector (OSTI)

The KEK digital accelerator (KEK-DA), which is a small-scale rapid-cycle induction synchrotron (IS), has commenced operation. A permanent magnet x-band electron cyclotron resonance ion source serves as the KEK-DA ion source and delivers various ions. A new Einzel lens beam chopper has been developed to provide the necessary pulse width of a few microseconds. The chopper is implemented by applying a rectangular pulse voltage generated by a solid-state Marx generator to the middle electrode of the Einzel lens. Momentum modulation at the bunch head and tail resulting from chopping in longitudinal direction has been observed. This intrinsic property of the chopped pulse has been clearly observed in a long drift (a free run in the circular ring) in KEK-DA.

K. W. Leo; T. Adachi; T. Arai; K. Takayama

2013-04-17T23:59:59.000Z

211

Light field and crosshair quality assurance test using a simple lens system  

SciTech Connect

We describe here a simple lens system to test the positioning of the field light source and mylar crosshair for radiation therapy linear accelerators. Ideally the light source for the field light and the crosshair should be centered on the axis of rotation of the collimator. The traditional method for testing this coincidence uses the shadow of the crosshair caused by the field light source. The shadow of the crosshair is dependent on the position of both the field light source and mylar crosshair. Geometrically it is possible for the field light source and the mylar crosshair to be off the axis of rotation of the collimator and still cause the shadow of the crosshair to be on the axis of rotation at some distance. Using a lens system the motion of the field light source and crosshair can be observed in sharp focus independently of one another as the collimator is rotated.

Hadley, Scott W.; Lam, Kwok [Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109-0010 (United States)

2006-04-15T23:59:59.000Z

212

ZnO Nanorod Arrays for Organic Solar Cells  

Science Journals Connector (OSTI)

We report on the synthesis and characterization of vapor phase grown zinc oxide nanorod arrays on sputtered aluminum-doped zinc oxide substrates. These arrays can serve as...

Conradt, Jonas; Thiele, Cornelius; Reinhard, Manuel; Lösch, Oliver; Sartor, Janos; Maier-Flaig, Florian; Schneider, Reinhard; Fotouhi, Mohammad; Pfundstein, Peter; Zibat, Volker; Colsmann, Alexander; Gerthsen, Dagmar; Lemmer, Uli; Kalt, Heinz

213

Hydrogen Bonded Arrays: The Power of Multiple Hydrogen Bonds...  

NLE Websites -- All DOE Office Websites (Extended Search)

Bonded Arrays: The Power of Multiple Hydrogen Bonds. Hydrogen Bonded Arrays: The Power of Multiple Hydrogen Bonds. Abstract: Hydrogen bond interactions in small covalent model...

214

Continuous Limit of Multiple Lens Effect and the Optical Scalar Equation  

E-Print Network (OSTI)

We study the continuous limit of the multiple gravitational lensing theory based on the thin lens approximation. Under the approximation, we define a new, light-path dependent angular diameter distance $\\tilde{d}$ and show that it satisfies the optical scalar equation. The distance provides relations between quantities used in the gravitational lensing theory (the convergence-, the shear- and the twist-term) and those used in the scalar optics theory (the rates of expansion, shear and rotation).

Hiroshi Yoshida; Kouji Nakamura; Minoru Omote

2004-07-02T23:59:59.000Z

215

AGATA - Advanced Gamma Tracking Array  

E-Print Network (OSTI)

The Advanced GAmma Tracking Array (AGATA) is a European project to develop and operate the next generation gamma-ray spectrometer. AGATA is based on the technique of gamma-ray energy tracking in electrically segmented high-purity germanium crystals. This technique requires the accurate determination of the energy, time and position of every interaction as a gamma ray deposits its energy within the detector volume. Reconstruction of the full interaction path results in a detector with very high efficiency and excellent spectral response. The realization of gamma-ray tracking and AGATA is a result of many technical advances. These include the development of encapsulated highly-segmented germanium detectors assembled in a triple cluster detector cryostat, an electronics system with fast digital sampling and a data acquisition system to process the data at a high rate. The full characterization of the crystals was measured and compared with detector-response simulations. This enabled pulse-shape analysis algorithms, to extract energy, time and position, to be employed. In addition, tracking algorithms for event reconstruction were developed. The first phase of AGATA is now complete and operational in its first physics campaign. In the future AGATA will be moved between laboratories in Europe and operated in a series of campaigns to take advantage of the different beams and facilities available to maximize its science output. The paper reviews all the achievements made in the AGATA project including all the necessary infrastructure to operate and support the spectrometer.

S. Akkoyun; A. Algora; B. Alikhani; F. Ameil; G. de Angelis; L. Arnold; A. Astier; A. Ataç; Y. Aubert; C. Aufranc; A. Austin; S. Aydin; F. Azaiez; S. Badoer; D. L. Balabanski; D. Barrientos; G. Baulieu; R. Baumann; D. Bazzacco; F. A. Beck; T. Beck; P. Bednarczyk; M. Bellato; M. A. Bentley; G. Benzoni; R. Berthier; L. Berti; R. Beunard; G. Lo Bianco; B. Birkenbach; P. G. Bizzeti; A. M. Bizzeti-Sona; F. Le Blanc; J. M. Blasco; N. Blasi; D. Bloor; C. Boiano; M. Borsato; D. Bortolato; A. J. Boston; H. C. Boston; P. Bourgault; P. Boutachkov; A. Bouty; A. Bracco; S. Brambilla; I. P. Brawn; A. Brondi; S. Broussard; B. Bruyneel; D. Bucurescu; I. Burrows; A. Bürger; S. Cabaret; B. Cahan; E. Calore; F. Camera; A. Capsoni; F. Carrió; G. Casati; M. Castoldi; B. Cederwall; J. -L. Cercus; V. Chambert; M. El Chambit; R. Chapman; L. Charles; J. Chavas; E. Clément; P. Cocconi; S. Coelli; P. J. Coleman-Smith; A. Colombo; S. Colosimo; C. Commeaux; D. Conventi; R. J. Cooper; A. Corsi; A. Cortesi; L. Costa; F. C. L. Crespi; J. R. Cresswell; D. M. Cullen; D. Curien; A. Czermak; D. Delbourg; R. Depalo; T. Descombes; P. Désesquelles; P. Detistov; C. Diarra; F. Didierjean; M. R. Dimmock; Q. T. Doan; C. Domingo-Pardo; M. Doncel; F. Dorangeville; N. Dosme; Y. Drouen; G. Duchêne; B. Dulny; J. Eberth; P. Edelbruck; J. Egea; T. Engert; M. N. Erduran; S. Ertürk; C. Fanin; S. Fantinel; E. Farnea; T. Faul; M. Filliger; F. Filmer; Ch. Finck; G. de France; A. Gadea; W. Gast; A. Geraci; J. Gerl; R. Gernhäuser; A. Giannatiempo; A. Giaz; L. Gibelin; A. Givechev; N. Goel; V. González; A. Gottardo; X. Grave; J. Gr?bosz; R. Griffiths; A. N. Grint; P. Gros; L. Guevara; M. Gulmini; A. Görgen; H. T. M. Ha; T. Habermann; L. J. Harkness; H. Harroch; K. Hauschild; C. He; A. Hernández-Prieto; B. Hervieu; H. Hess; T. Hüyük; E. Ince; R. Isocrate; G. Jaworski; A. Johnson; J. Jolie; P. Jones; B. Jonson; P. Joshi; D. S. Judson; A. Jungclaus; M. Kaci; N. Karkour; M. Karolak; A. Ka?ka?; M. Kebbiri; R. S. Kempley; A. Khaplanov; S. Klupp; M. Kogimtzis; I. Kojouharov; A. Korichi; W. Korten; Th. Kröll; R. Krücken; N. Kurz; B. Y. Ky; M. Labiche; X. Lafay; L. Lavergne; I. H. Lazarus; S. Leboutelier; F. Lefebvre; E. Legay; L. Legeard; F. Lelli; S. M. Lenzi; S. Leoni; A. Lermitage; D. Lersch; J. Leske; S. C. Letts; S. Lhenoret; R. M. Lieder; D. Linget; J. Ljungvall; A. Lopez-Martens; A. Lotodé; S. Lunardi; A. Maj; J. van der Marel; Y. Mariette; N. Marginean; R. Marginean; G. Maron; A. R. Mather; W. M?czy?ski; V. Mendéz; P. Medina; B. Melon; R. Menegazzo; D. Mengoni; E. Merchan; L. Mihailescu; C. Michelagnoli; J. Mierzejewski; L. Milechina; B. Million; K. Mitev; P. Molini; D. Montanari; S. Moon; F. Morbiducci; R. Moro; P. S. Morrall; O. Möller; A. Nannini; D. R. Napoli; L. Nelson; M. Nespolo; V. L. Ngo; M. Nicoletto; R. Nicolini; Y. Le Noa; P. J. Nolan; M. Norman; J. Nyberg; A. Obertelli; A. Olariu; R. Orlandi; D. C. Oxley; C. Özben; M. Ozille; C. Oziol; E. Pachoud; M. Palacz; J. Palin; J. Pancin; C. Parisel; P. Pariset; G. Pascovici; R. Peghin; L. Pellegri; A. Perego; S. Perrier; M. Petcu; P. Petkov; C. Petrache; E. Pierre; N. Pietralla; S. Pietri; M. Pignanelli; I. Piqueras; Z. Podolyak; P. Le Pouhalec; J. Pouthas; D. Pugnére; V. F. E. Pucknell; A. Pullia; B. Quintana; R. Raine; G. Rainovski; L. Ramina; G. Rampazzo; G. La Rana; M. Rebeschini; F. Recchia; N. Redon; M. Reese; P. Reiter; P. H. Regan; S. Riboldi; M. Richer; M. Rigato; S. Rigby; G. Ripamonti; A. P. Robinson; J. Robin; J. Roccaz; J. -A. Ropert; B. Rossé; C. Rossi Alvarez; D. Rosso; B. Rubio; D. Rudolph; F. Saillant; E. ?ahin; F. Salomon; M. -D. Salsac; J. Salt; G. Salvato; J. Sampson; E. Sanchis; C. Santos; H. Schaffner; M. Schlarb; D. P. Scraggs; D. Seddon; M. ?enyi?it; M. -H. Sigward; G. Simpson; J. Simpson; M. Slee; J. F. Smith; P. Sona; B. Sowicki; P. Spolaore; C. Stahl; T. Stanios; E. Stefanova; O. Stézowski; J. Strachan; G. Suliman; P. -A. Söderström; J. L. Tain; S. Tanguy; S. Tashenov; Ch. Theisen; J. Thornhill; F. Tomasi; N. Toniolo; R. Touzery; B. Travers; A. Triossi; M. Tripon; K. M. M. Tun-Lanoë; M. Turcato; C. Unsworth; C. A. Ur; J. J. Valiente-Dobon; V. Vandone; E. Vardaci; R. Venturelli; F. Veronese; Ch. Veyssiere; E. Viscione; R. Wadsworth; P. M. Walker; N. Warr; C. Weber; D. Weisshaar; D. Wells; O. Wieland; A. Wiens; G. Wittwer; H. J. Wollersheim; F. Zocca; N. V. Zamfir; M. Zi?bli?ski; A. Zucchiatti

2011-11-24T23:59:59.000Z

216

High power semiconductor laser diode arrays  

Science Journals Connector (OSTI)

The cw optical power obtainable from semiconductor laser diodes has been extended to unprecedented levels in recent years through the use of multistripe arrays. By spreading out the optical power with more than 100 stripes single?facet cw output in exces of 5 Watts has been demonstrated and 500 mW cw is now commercially available. Recent improvements to array performance include: arrays up to 1 cm wide that generates quasi?cw (150 usec pulse) output in excesss of 11 Watts and a novel device structure which produces up to 215 mW cw in a single diffraction limited lobe.

Peter S. Cross

1986-01-01T23:59:59.000Z

217

High power semiconductor laser diode arrays  

SciTech Connect

The cw optical power obtainable from semiconductor laser diodes has been extended to unprecedented levels in recent years through the use of multistripe arrays. By spreading out the optical power with more than 100 stripes, single-facet, cw output in exces of 5 Watts has been demonstrated, and 500 mW cw is now commercially available. Recent improvements to array performance include: arrays up to 1 cm wide that generates quasi-cw (150 usec pulse) output in excesss of 11 Watts, and a novel device structure which produces up to 215 mW cw in a single diffraction limited lobe.

Cross, P.S.

1986-08-15T23:59:59.000Z

218

Low-cost laser diode array  

DOE Patents (OSTI)

A substrate is used to fabricate a low-cost laser diode array. A substrate is machined from an electrically insulative material that is thermally conductive, or two substrates can be bonded together in which the top substrate is electrically as well as thermally conductive. The substrate thickness is slightly longer than the cavity length, and the width of the groove is wide enough to contain a bar and spring (which secures the laser bar firmly along one face of the groove). The spring also provides electrical continuity from the backside of the bar to the adjacent metalization layer on the laser bar substrate. Arrays containing one or more bars can be formed by creating many grooves at various spacings. Along the groove, many bars can be adjoined at the edges to provide parallel electrical conduction. This architecture allows precise and predictable registration of an array of laser bars to a self-aligned microlens array at low cost.

Freitas, Barry L. (Livermore, CA); Skidmore, Jay A. (Livermore, CA)

1999-01-01T23:59:59.000Z

219

Low-cost laser diode array  

DOE Patents (OSTI)

A substrate is used to fabricate a low-cost laser diode array. A substrate is machined from an electrically insulative material that is thermally conductive, or two substrates can be bonded together in which the top substrate is electrically as well as thermally conductive. The substrate thickness is slightly longer than the cavity length, and the width of the groove is wide enough to contain a bar and spring (which secures the laser bar firmly along one face of the groove). The spring also provides electrical continuity from the backside of the bar to the adjacent metalization layer on the laser bar substrate. Arrays containing one or more bars can be formed by creating many grooves at various spacings. Along the groove, many bars can be adjoined at the edges to provide parallel electrical conduction. This architecture allows precise and predictable registration of an array of laser bars to a self-aligned microlens array at low cost. 19 figs.

Freitas, B.L.; Skidmore, J.A.

1999-06-01T23:59:59.000Z

220

Density controlled carbon nanotube array electrodes  

DOE Patents (OSTI)

CNT materials comprising aligned carbon nanotubes (CNTs) with pre-determined site densities, catalyst substrate materials for obtaining them and methods for forming aligned CNTs with controllable densities on such catalyst substrate materials are described. The fabrication of films comprising site-density controlled vertically aligned CNT arrays of the invention with variable field emission characteristics, whereby the field emission properties of the films are controlled by independently varying the length of CNTs in the aligned array within the film or by independently varying inter-tubule spacing of the CNTs within the array (site density) are disclosed. The fabrication of microelectrode arrays (MEAs) formed utilizing the carbon nanotube material of the invention is also described.

Ren, Zhifeng F. (Newton, MA); Tu, Yi (Belmont, MA)

2008-12-16T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

Science with the Murchison Widefield Array  

E-Print Network (OSTI)

Significant new opportunities for astrophysics and cosmology have been identified at low radio frequencies. The Murchison Widefield Array is the first telescope in the southern hemisphere designed specifically to explore ...

Cappallo, Roger J.

222

Stimuli-responsive polymer nanotube arrays  

E-Print Network (OSTI)

Nanotube arrays, composed of materials such as carbon, titania, and zinc oxide, have shown potential as conductors, energy conversion devices, actuators, and adhesives. Such nanoscale constructs are particularly novel for ...

Chia, Khek-Khiang

2011-01-01T23:59:59.000Z

223

Solid waste drum array fire performance  

SciTech Connect

Fire hazards associated with drum storage of radioactively contaminated waste are a major concern in DOE waste storage facilities. This report is the second of two reports on fire testing designed to provide data relative to the propagation of a fire among storage drum arrays. The first report covers testing of individual drums subjected to an initiating fire and the development of the analytical methodology to predict fire propagation among storage drum arrays. This report is the second report, which documents the results of drum array fire tests. The purpose of the array tests was to confirm the analytical methodology developed by Phase I fire testing. These tests provide conclusive evidence that fire will not propagate from drum to drum unless an continuous fuel source other than drum contents is provided.

Louie, R.L. [Westinghouse Hanford Co., Richland, WA (United States); Haecker, C.F. [Los Alamos Technical Associates, Inc., Kennewick, WA (United States); Beitel, J.J.; Gottuck, D.T.; Rhodes, B.T.; Bayier, C.L. [Hughes Associates, Inc., Baltimore, MD (United States)

1995-09-01T23:59:59.000Z

224

Efficient Versioning for Scientific Array Databases  

E-Print Network (OSTI)

In this paper, we describe a versioned database storage manager we are developing for the SciDB scientific database. The system is designed to efficiently store and retrieve array-oriented data, exposing a "no-overwrite" ...

Seering, Adam

225

Robustness of the magnetoresistance of nanoparticle arrays  

Science Journals Connector (OSTI)

Recent work has found that the interplay between spin accumulation and Coulomb blockade in nanoparticle arrays results in peaky I-V and tunneling magnetoresistance (TMR) curves and in huge values of the TMR. We analyze how these effects are influenced by a polarization asymmetry of the electrodes, the dimensionality of the array, the temperature, resistance, or charge disorder, and long-range interactions. We show that the magnitude and voltage dependence of the TMR do not change with the dimensionality of the array or the presence of junction resistance disorder. A different polarization in the electrodes modifies the peak shape in the I-V and TMR curves but not their order of magnitude. Increasing the temperature or length of the interaction reduces to some extent the size of the peaks, the reduction being due to long-range interactions that are smaller in longer arrays. Charge disorder should be avoided to observe large TMR values.

V. Estévez and E. Bascones

2011-08-09T23:59:59.000Z

226

FEA Analysis of AP-0 Target Hall Collection Lens (Current Design)  

SciTech Connect

The AP-0 Target Hall Collection Lens is a pulsed device which focuses anti-protons just downstream of the Target. Since the angles at which the anti-protons depart the Target can be quite large, a very high focusing strength is required to maximize anti-proton capture into the downstream Debuncher Ring. The current design of the Collection Lens was designed to operate with a focusing gradient of 1,000 T/m. However, multiple failures of early devices resulted in lowering the normal operating gradient to about 750 T/m. At this gradient, the Lens design fares much better, lasting several million pulses, but ultimately still fails. A Finite Element Analysis (FEA) has been performed on this Collection Lens design to help determine the cause and/or nature of the failures. The Collection Lens magnetic field is created by passing high current through a central conductor cylinder. A uniform current distribution through the cylinder will create a tangential or azimuthal magnetic field that varies linearly from zero at the center of the cylinder to a maximum at the outer surface of the cylinder. Anti-proton particles passing through this cylinder (along the longitudinal direction) will see an inward focusing kick back toward the center of the cylinder proportional to the magnetic field strength. For the current Lens design a gradient of 1,000 T/m requires a current of about 580,000 amps. Since the DC power and cooling requirements would be prohibitive, the Lens is operated in a pulsed mode. Each pulse is half sine wave in shape with a pulse duration of about 350 microseconds. Because of the skin effect, the most uniform current density actually occurs about two-thirds of the way through the pulse. This means that the maximum current of the pulse is actually higher than that required in the DC case (about 670,000 amps). Since the beam must pass through the central conductor cylinder it must be made of a conducting material that is also very 'transparent' to the beam. For the Collection Lens, this material is lithium (Li). The central conductor cylinder is a lithium cylinder 1 cm in radius and about 14 cm long. Figure 1 shows this cylinder in a cross-section view of the Collection Lens. Surrounding the central cylinder is a jacket of titanium alloy (6Al-4V ELI) called the septum. The septum's purpose is to contain the lithium against various thermal and magnetic forces while allowing cooling (melting point of Li is 180.5 C) by an annular water passage. The ends of the Li cylinder are bound by end windows made of beryllium (Be) and a thin titanium (ti) foil. The foil protects the Be from the corrosive effects of Li and the Be window provides the structural support. The two end windows sit in pockets in the ends of two larger steel cylinders or body halves. The body halves are separated from each other by ceramic spacers. The body halves, septum and end windows are connected to each other by nickel (Ni) seals which preserve the boundary of the lithium conductor. Force required to make these seals is provided by eight Ti 6Al-4V ELI tie rods which traverse the entire assembly. These tie rods also resist magnetic forces that attempt to separate the body halves during the current pulse. There are several insulating components that are used to isolate one side of the lens from the other and force the current through the central Li conductor. The volumes of Li at each end of the central conductor cylinder outside the septum but inside the body halves are called buffer volumes. These buffer volumes serve two roles. One, they provide a low resistance current path to the end of the central conductor cylinder. Two, they provide a volume for Li to expand into during the current pulse. For the latter it is assumed that magnetic forces and thermal strains will force lithium from the central cylinder and into the buffer volumes during the current pulse. There are several loads on the Lens that are developed during a current pulse. High magnetic loads act radially and longitudinally outward on the steel body halves and radially inward on the central

Hurh, P.G.; Tang, Z.

2001-06-22T23:59:59.000Z

227

E-Print Network 3.0 - avalanche photodiode array Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

array Search Powered by Explorit Topic List Advanced Search Sample search results for: avalanche photodiode array...

228

E-Print Network 3.0 - avalanche photodiode arrays Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

arrays Search Powered by Explorit Topic List Advanced Search Sample search results for: avalanche photodiode arrays...

229

Electrostatic Modeling of CMOS sensor array 1 Computing Security  

E-Print Network (OSTI)

to Hades. #12;Electrostatic Modeling of CMOS sensor array 3 7 Kerberos Tickets Used for authentication

Cukic, Bojan

230

The Very Long Baseline ArrayThe Very Long Baseline Array Brought to you by the National Radio  

E-Print Network (OSTI)

The Very Long Baseline ArrayThe Very Long Baseline Array Brought to you by the National Radio Los Alamos, NM Pie Town, NM Kitt Peak, AZ Owens Valley, CA Brewster, WA Mauna Kea, HI #12;· weighs 240 gravitational lenses #12;www.www.nraonrao..eduedu #12;The Very Long Baseline ArrayThe Very Long Baseline Array

Groppi, Christopher

231

Improving angular acceptance of stationary low-concentration photovoltaic compound parabolic concentrators using acrylic lens-walled structure  

Science Journals Connector (OSTI)

Low-concentration photovoltaic compound parabolic concentrators (PV-CPC) are a significant addition of solar cell application especially in Building Integrated Photovoltaics because it does not need a tracking system and can be installed in a stationary condition. However higher concentrations correspond with the smaller half acceptance angle which is a limitation but can be improved by a lens-walled structure. In this paper to validate the rationale of this structure a low-concentration PV-CPC using an acrylic lens-walled structure module was designed and fabricated with low-cost materials. The corresponding simulation was also performed with different materials to determine whether the factor that the truncation had a significant effect. The observed outcome implied that the low-concentration PV-CPC using an acrylic lens-walled structure has a larger half acceptance angle than the mirror CPC and that a maximum optical efficiency of more than 80% can be achieved using Schott BK glass as the lens wall material. The lens-walled structure improved the angular acceptance of stationary low-concentration PV-CPC providing a basis for further research.

2014-01-01T23:59:59.000Z

232

Experimental constraints on the kinetics of ice lens initiation and growth  

Science Journals Connector (OSTI)

Ice lenses are formed by the migration and solidification of unfrozen water during soil freezing, which can lead to the upwards displacement of the ground surface known as frost heave. The complicated interplay between heat and mass transport that causes ice lens formation has been addressed by several theoretical models, but uncertainties remain that require further experimental constraints. In particular, the initiation of ice lenses has long posed theoretical difficulties. We performed a series of stepwise freezing experiments in fine granular materials to observe the initiation and growth of ice lenses. Our experiments demonstrate clear and systematic relationships between the behavior of ice lenses, and the particle size and cooling temperature. Ice lenses are thicker when formed in sediments with smaller particle sizes and the initial formation position is further from the cooled boundary when it is set to lower temperatures. Our temperature measurements and photographic documentation demonstrate that ice lenses are formed below the nominal melting temperature, at a location that is sufficiently distant for the freezing velocity to have slowed below a threshold. We compared our experimental results to numerical predictions of ice lens formation that were applied to our experimental conditions. Our experimental trends are consistent with predictions of our simple, initial model. However, important quantitative differences motivate a refined treatment that emphasizes the kinetics of liquid supply from the pore space through the thin films that separate ice lenses from particle surfaces. We obtained good quantitative agreement between our experimental measurements and the refined model predictions, emphasizing the importance of kinetic effects as a control in ice lens initiation and growth.

Tomotaka Saruya; Kei Kurita; Alan W. Rempel

2013-03-18T23:59:59.000Z

233

Cavity cooling of an atomic array  

E-Print Network (OSTI)

While cavity cooling of a single trapped emitter was demonstrated, cooling of many particles in an array of harmonic traps needs investigation and poses a question of scalability. This work investigates the cooling of a one dimensional atomic array to the ground state of motion via the interaction with the single mode field of a high-finesse cavity. The key factor ensuring the cooling is found to be the mechanical inhomogeneity of the traps. Furthermore it is shown that the pumped cavity mode does not only mediate the cooling but also provides the necessary inhomogeneity if its periodicity differs from the one of the array. This configuration results in the ground state cooling of several tens of atoms within a few milliseconds, a timescale compatible with current experimental conditions. Moreover, the cooling rate scaling with the atom number reveals a drastic change of the dynamics with the size of the array: atoms are either cooled independently, or via collective modes. In the latter case the cavity mediated atom interaction destructively slows down the cooling as well as increases the mean occupation number, quadratically with the atom number. Finally, an order of magnitude speed up of the cooling is predicted as an outcome the optimization scheme based on the adjustment of the array versus the cavity mode periodicity.

Oxana Mishina

2014-04-16T23:59:59.000Z

234

Continuous Limit of Multiple Gravitational Lens Effect and Average Magnification Factor  

E-Print Network (OSTI)

We show that the gravitational magnification factor averaged over all configurations of lenses in a locally inhomogeneous universe satisfy a second order differential equation with redshift $z$ by taking the continuous limit of multi-plane gravitational lens equation (the number $N$ of lenses $\\to\\infty$) and that the gravitationally magnified Dyer-Roeder distance in a clumpy universe becomes to that of the Friedmann-Lema\\^{\\i}tre universe for arbitrary values of the density parameter $\\Omega_{0}$ and of a mass fraction $\\bar{\\alpha}$ (smoothness parameter).

Hiroshi Yoshida; Kouji Nakamura; Minoru Omote

2003-04-01T23:59:59.000Z

235

Gravitational lens optical scalars in terms of energy-momentum distributions  

SciTech Connect

This is a general work on gravitational lensing. We present new expressions for the optical scalars and the deflection angle in terms of the energy-momentum tensor components of matter distributions. Our work generalizes standard references in the literature where normally stringent assumptions are made on the sources. The new expressions are manifestly gauge invariant, since they are presented in terms of curvature components. We also present a method of approximation for solving the lens equations, that can be applied to any order.

Gallo, Emanuel; Moreschi, Osvaldo M. [Facultad de Matematica, Astronomia, y Fisica, FaMAF, Universidad Nacional de Cordoba, Instituto de Fisica Enrique Gaviola, IFEG, CONICET Ciudad Universitaria, (5000) Cordoba (Argentina)

2011-04-15T23:59:59.000Z

236

Planning for Action Research: Looking at Practice through a Different Lens  

SciTech Connect

It has been my experience that behavioral science practitioners, including myself, often 'back into' action research. That is, we start out doing a process improvement or intervention and discover something along the way - generalizable knowledge - that seems worthwhile to share with our community of practice. What if, instead of looking at these projects from the point of view of practitioners, we looked at them as research from the outset? Would that change the outcome or generate additional knowledge? This paper compares and contrasts process improvement and action research methods, and illustrates how use of a research 'lens' can enhance behavioral science interventions and the knowledge that may result from them.

Hahn, Heidi A. [Los Alamos National Laboratory

2012-08-03T23:59:59.000Z

237

Gravitational lens optical scalars in terms of energy-momentum distributions  

E-Print Network (OSTI)

This is a general work on gravitational lensing. We present new expressions for the optical scalars and the deflection angle in terms of the energy-momentum tensor components of matter distributions. Our work generalizes standard references in the literature where normally stringent assumptions are made on the sources. The new expressions are manifestly gauge invariant, since they are presented in terms of curvature components. We also present a method of approximation for solving the lens equations, that can be applied to any order.

Emanuel Gallo; Osvaldo M. Moreschi

2011-05-09T23:59:59.000Z

238

Demonstration of 12 nm resolution Fresnel zone plate lens based soft x-ray microscopy  

SciTech Connect

To extend soft x-ray microscopy to a resolution of order 10 nm or better, we developed a new nanofabrication process for Fresnel zone plate lenses. The new process, based on the double patterning technique, has enabled us to fabricate high quality gold zone plates with 12 nm outer zones. Testing of the zone plate with the full-field transmission x-ray microscope, XM-1, in Berkeley, showed that the lens clearly resolved 12 nm lines and spaces. This result represents a significant step towards 10 nm resolution and beyond.

Chao, W.; Kim, J.; Rekawa, S.; Fischer, P.; Anderson, E. H.

2009-06-05T23:59:59.000Z

239

Free-free absorption in the gravitational lens JVAS B0218+357  

E-Print Network (OSTI)

We address the issue of anomalous image flux ratios seen in the double-image gravitational lens JVAS B0218+357. From the multi-frequency observations presented in a recent study (Mittal et al. 2006) and several previous observations made by other authors, the anomaly is well-established in that the image flux-density ratio (A/B) decreases from 3.9 to 2.0 over the observed frequency range from 15 GHz to 1.65 GHz. In Mittal et al. (2006), the authors investigated whether an interplay between a frequency-dependent structure of the background radio-source and a gradient in the relative image-magnification can explain away the anomaly. Insufficient shifts in the image centroids with frequency led them to discard the above effect as the cause of the anomaly. In this paper, we first take this analysis further by evaluating the combined effect of the background source extension and magnification gradients in the lens plane in more detail. This is done by making a direct use of the observed VLBI flux-distributions for each image to estimate the image flux-density ratios at different frequencies from a lens-model. As a result of this investigation, this mechanism does not account for the anomaly. Following this, we analyze the effects of mechanisms which are non-gravitational in nature on the image flux ratios in B0218+357. These are free-free absorption and scattering, and are assumed to occur under the hypothesis of a molecular cloud residing in the lens galaxy along the line-of-sight to image A. We show that free-free absorption due to an H II region covering the entire structure of image A at 1.65 GHz can explain the image flux ratio anomaly. We also discuss whether H II regions with physical parameters as derived from our analysis are consistent with those observed in Galactic and extragalactic H II regions.

Rupal Mittal; Richard Porcas; Olaf Wucknitz

2006-07-27T23:59:59.000Z

240

All-dielectric three-dimensional broadband Eaton lens with large refractive index range  

SciTech Connect

We proposed a method to realize three-dimensional (3D) gradient index (GRIN) devices requiring large refractive index (RI) range with broadband performance. By combining non-resonant GRIN woodpile photonic crystals structure in the metamaterial regime with a compound liquid medium, a wide RI range (1–6.32) was fulfilled flexibly. As a proof-of-principle for the low-loss and non-dispersive method, a 3D Eaton lens was designed and fabricated based on 3D printing process. Full-wave simulation and experiment validated its omnidirectional wave bending effects in a broad bandwidth covering Ku band (12?GHz–18?GHz)

Yin, Ming; Yong Tian, Xiao, E-mail: leoxyt@mail.xjtu.edu.cn; Ling Wu, Ling; Chen Li, Di [State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049 (China)

2014-03-03T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" from the National Library of EnergyBeta (NLEBeta).
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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

The Cherenkov Telescope Array Large Size Telescope  

E-Print Network (OSTI)

The two arrays of the Very High Energy gamma-ray observatory Cherenkov Telescope Array (CTA) will include four Large Size Telescopes (LSTs) each with a 23 m diameter dish and 28 m focal distance. These telescopes will enable CTA to achieve a low-energy threshold of 20 GeV, which is critical for important studies in astrophysics, astroparticle physics and cosmology. This work presents the key specifications and performance of the current LST design in the light of the CTA scientific objectives.

Ambrosi, G; Baba, H; Bamba, A; Barceló, M; de Almeida, U Barres; Barrio, J A; Bigas, O Blanch; Boix, J; Brunetti, L; Carmona, E; Chabanne, E; Chikawa, M; Colin, P; Conteras, J L; Cortina, J; Dazzi, F; Deangelis, A; Deleglise, G; Delgado, C; Díaz, C; Dubois, F; Fiasson, A; Fink, D; Fouque, N; Freixas, L; Fruck, C; Gadola, A; García, R; Gascon, D; Geffroy, N; Giglietto, N; Giordano, F; Grañena, F; Gunji, S; Hagiwara, R; Hamer, N; Hanabata, Y; Hassan, T; Hatanaka, K; Haubold, T; Hayashida, M; Hermel, R; Herranz, D; Hirotani, K; Inoue, S; Inoue, Y; Ioka, K; Jablonski, C; Kagaya, M; Katagiri, H; Kishimoto, T; Kodani, K; Kohri, K; Konno, Y; Koyama, S; Kubo, H; Kushida, J; Lamanna, G; Flour, T Le; López-Moya, M; López, R; Lorenz, E; Majumdar, P; Manalaysay, A; Mariotti, M; Martínez, G; Martínez, M; Mazin, D; Miranda, J M; Mirzoyan, R; Monteiro, I; Moralejo, A; Murase, K; Nagataki, S; Nakajima, D; Nakamori, T; Nishijima, K; Noda, K; Nozato, A; Ohira, Y; Ohishi, M; Ohoka, H; Okumura, A; Orito, R; Panazol, J L; Paneque, D; Paoletti, R; Paredes, J M; Pauletta, G; Podkladkin, S; Prast, J; Rando, R; Reimann, O; Ribó, M; Rosier-Lees, S; Saito, K; Saito, T; Saito, Y; Sakaki, N; Sakonaka, R; Sanuy, A; Sasaki, H; Sawada, M; Scalzotto, V; Schultz, S; Schweizer, T; Shibata, T; Shu, S; Sieiro, J; Stamatescu, V; Steiner, S; Straumann, U; Sugawara, R; Tajima, H; Takami, H; Tanaka, S; Tanaka, M; Tejedor, L A; Terada, Y; Teshima, M; Totani, T; Ueno, H; Umehara, K; Vollhardt, A; Wagner, R; Wetteskind, H; Yamamoto, T; Yamazaki, R; Yoshida, A; Yoshida, T; Yoshikoshi, T

2013-01-01T23:59:59.000Z

242

Image enhancement with polymer grid triode arrays  

SciTech Connect

An array of polymer grid triodes connected by a common grid functions as a {open_quotes}plastic retina,{close_quotes} providing local contrast gain control for image enhancement. This simple device, made from layers of conducting polymers, functions as an active resistive network that performs center-surround filtering. The polymer grid triode array with common grid is a continuous analog of the discrete approach of Mead, with a variety of fabrication advantages and significant savings in area within the unit cell of each pixel. 6 refs., 4 figs.

Heeger, A.J.; Heeger, D.J.; Langan, J. [UNIAX Corporation, Santa Barbara, CA (United States)] [and others

1995-12-08T23:59:59.000Z

243

DEFECT ASSESSMENT USING CONFORMABLE ARRAY DATA  

SciTech Connect

This report covers the design and fabrication of a conformable eddy current array useful for the mapping and measurement of external corrosion on a transmission pipeline. The feasibility of the basic measuring approach was demonstrated and the general guidelines for sensor design were disclosed in a previous project. This project was concerned with design of a practical array, development of interface electronics, and design of the operation and analysis software. A prototype system was constructed, checked out, and demonstrated on natural corrosion in a field environment.

Alfred E. Crouch; Todd H. Goyen

2003-12-01T23:59:59.000Z

244

Benchmark Evaluation of Plutonium Nitrate Solution Arrays  

SciTech Connect

In October and November of 1981 thirteen approach-to-critical experiments were performed on a remote split table machine (RSTM) in the Critical Mass Laboratory of Pacific Northwest Laboratory (PNL) in Richland, Washington, using planar arrays of polyethylene bottles filled with plutonium (Pu) nitrate solution. Arrays of up to sixteen bottles were used to measure the critical number of bottles and critical array spacing with a tight fitting Plexiglas{reg_sign} reflector on all sides of the arrays except the top. Some experiments used Plexiglas shells fitted around each bottles to determine the effect of moderation on criticality. Each bottle contained approximately 2.4 L of Pu(NO3)4 solution with a Pu content of 105 g Pu/L and a free acid molarity H+ of 5.1. The plutonium was of low 240Pu (2.9 wt.%) content. These experiments were performed to fill a gap in experimental data regarding criticality limits for storing and handling arrays of Pu solution in reprocessing facilities. Of the thirteen approach-to-critical experiments eleven resulted in extrapolations to critical configurations. Four of the approaches were extrapolated to the critical number of bottles; these were not evaluated further due to the large uncertainty associated with the modeling of a fraction of a bottle. The remaining seven approaches were extrapolated to critical array spacing of 3-4 and 4-4 arrays; these seven critical configurations were evaluation for inclusion as acceptable benchmark experiments in the International Criticality Safety Benchmark Evaluation Project (ICSBEP) Handbook. Detailed and simple models of these configurations were created and the associated bias of these simplifications was determined to range from 0.00116 and 0.00162 {+-} 0.00006 ?keff. Monte Carlo analysis of all models was completed using MCNP5 with ENDF/BVII.0 neutron cross section libraries. A thorough uncertainty analysis of all critical, geometric, and material parameters was performed using parameter perturbation methods. It was found that uncertainty in the impurities in the polyethylene bottles, reflector position, bottle outer diameter, and critical array spacing had the largest effect. The total uncertainty ranged from 0.00651 to 0.00920 ?keff. Evaluation methods and results will be presented and discussed in greater detail in the full paper.

M. A. Marshall; J. D. Bess

2011-09-01T23:59:59.000Z

245

The Cosmic Lens All-Sky Survey: I. Source selection and observations  

E-Print Network (OSTI)

The Cosmic Lens All-Sky Survey (CLASS) is an international collaborative program which has obtained high-resolution radio images of over 10000 flat-spectrum radio sources in order to create the largest and best studied statistical sample of radio-loud gravitationally lensed systems. With this survey, combined with detailed studies of the lenses found therein, constraints can be placed on the expansion rate, matter density, and dark energy (e.g. cosmological constant, quintessence) content of the Universe that are complementary to and independent of those obtained through other methods. CLASS is aimed at identifying lenses where multiple images are formed from compact flat-spectrum radio sources, which should be easily identifiable in the radio maps. Because CLASS is radio-based, dust obscuration in lensing galaxies is not a factor, and the relative insensitivity of the instrument to environmental conditions leads to nearly uniform sensitivity and resolution over the entire survey. In four observing seasons from 1994-1999, CLASS has observed 13783 radio sources with the VLA at 8.4 GHz at 0.2 arcsecond resolution. When combined with the JVAS survey, the CLASS sample contains over 16,000 images. A complete sample of 11685 flat-spectrum sources was observed, selected from GB6 catalogue at 4.85 GHz and the NVSS at 1.4 GHz. So far, CLASS has found 16 new gravitational lens systems, and the JVAS/CLASS survey contains a total of 22 lenses. (Abridged)

S. T. Myers; N. J. Jackson; I. W. A. Browne; A. G. de Bruyn; T. J. Pearson; A. C. S. Readhead; P. N. Wilkinson; A. D. Biggs; R. D. Blandford; C. D. Fassnacht; L. V. E. Koopmans; D. R. Marlow; J. P. McKean; M. A. Norbury; P. M. Phillips; D. Rusin; M. C. Shepherd; C. M. Sykes

2002-11-05T23:59:59.000Z

246

Using Optical and Near-IR Photometry to Test MACHO Lens Candidates  

E-Print Network (OSTI)

We obtained new VLT/ISAAC H-band observations for five MACHO LMC source stars and adjacent LMC field regions. After combining our near-IR photometry with HST/PC BVRI optical photometry, we compared the MACHO objects to the adjacent field stars in a variety of color-magnitude and color-color diagrams. These diagnostic diagrams were chosen to be sensitive to our hypothesis that at least some of the MACHO lenses were foreground Galactic disk or thick disk M dwarfs. For the five lensed objects we studied, our hypothesis could be ruled out for main sequence lens masses >= 0.1 Mo for distances out to 4 kpc. On the other hand, the fact that LMC-MACHO-5, an object not in our study, has been recently found to have just such a foreground lens, highlights that the remainder of the LMC MACHO objects should be searched for the signature of their lenses using our photometric technique, or via near-IR spectroscopy. We also constructed diagnostic color-color diagrams sensitive to determining reddening for the individual MACHO source stars and found that these five objects did not show evidence for significant additional reddening. At least these five MACHO objects are thus also inconsistent with the LMC self-lensing hypothesis.

Ted von Hippel; Ata Sarajedini; Maria Teresa Ruiz

2003-07-24T23:59:59.000Z

247

Lens Evaluation  

Science Journals Connector (OSTI)

Solar collectors suffer from many types of loss. The collector is an energy system consisting of a concentrator, a receiver, some kind of support structure, and the means to connect it to a larger system such ...

Dr. Ralf Leutz; Dr. Akio Suzuki

2001-01-01T23:59:59.000Z

248

Multitaper Array Processing Kathleen E. Wage  

E-Print Network (OSTI)

Multitaper Array Processing Kathleen E. Wage November 2007 Proceedings of the 41st Asilomar has fewer time snapshots to work with, and the result is often substantial degradation in perfor of reasons, including source and/or receiver motion, environmental fluctuations, and transient excitation

Wage, Kathleen

249

Topological Order in Frustrated Josephson Junction Arrays  

E-Print Network (OSTI)

We show that electrically and magnetically frustrated Josephson junction arrays (JJAs) realize topological order with a non-trivial ground state degeneracy on manifolds with non-trivial topology. The low-energy theory has the same gauge dynamics of the unfrustrated JJAs but for different, "fractional" degrees of freedom, a principle reminescent of Jain's composite electrons in the fractional quantum Hall effect.

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

2008-06-02T23:59:59.000Z

250

Superconducting Topological Fluids in Josephson Junction Arrays  

E-Print Network (OSTI)

We argue that the frustrated Josephson junction arrays may support a topologically ordered superconducting ground state, characterized by a non-trivial ground state degeneracy on the torus. This superconducting quantum fluid provides an explicit example of a system in which superconductivity arises from a topological mechanism rather than from the usual Landau-Ginzburg mechanism.

M. Cristina Diamantini; Pasquale Sodano; Carlo A. Trugenberger

2006-04-21T23:59:59.000Z

251

Microphone array with computer vision based directivity  

Science Journals Connector (OSTI)

In the field of acoustic signal processing one of the most popular areas of research is that of microphone arrays. As a small research project in this field a microphone array system with adjustable polar response will be developed. To make research more innovative and multi-disciplinary the polar response of the array will be controlled by a facial tracking system implemented with computer vision techniques. This research will take part as a means of combining coursework and research for courses in engineering acoustics computer vision and real-time digital signal processing at the University of Miami. Before any physical testing simulations will be performed in MATLAB to determine optimum array configurations and to analyze various facial tracking and dsp algorithms. Then using a Texas Instruments TMS320C6713 DSP on a DSK audio target board and writing code in C ASSEMBLY and MATLAB physical tests will be conducted to analyze performance of design. A MEMS microphone model will likely be used for its small size and low cost. A Microsoft Kinect and compatible desktop computer will be used for the computer vision interface. From there results will be analyzed and further research in the area proposed.

Marc Messier; Jordan Reimers

2013-01-01T23:59:59.000Z

252

The Long Wavelength Array (LWA) URSI --Ottawa  

E-Print Network (OSTI)

Inst. & State U. N. Kassim, U.S. Naval Research Laboratory G. Taylor, University of New Mexico Lee J Rickard, University of New Mexico #12;The Long Wavelength Array (LWA) An LWA Station State of New Mexico cosmic rays Supernova remnants & Galactic evolution Pulsars Solar Science & Space Weather Radio

Ellingson, Steven W.

253

DEFECT ASSESSMENT USING CONFORMABLE ARRAY DATA  

SciTech Connect

This first quarterly report of the project presents the activity and conclusions reached to date. Specifically, several of the design parameters of the field eddy current array have been determined and the overall approach to data collection and analysis selected. A kick-off meeting was held at the Clock Spring Company offices, where the project status was presented to the NETL Project Officer.

Alfred E. Crouch

2003-01-01T23:59:59.000Z

254

A Connecticut jury array challenge David Pollard  

E-Print Network (OSTI)

A Connecticut jury array challenge by David Pollard Yale University david.pollard@yale.edu http a detailed statistical study of the system used for summon- sing jurors to serve in the State of Connecticut's Superior Courts. The study was made at the request of the Connecticut Public Defender's Office, to provide

Pollard, David

255

HASKELL ARRAYS, ACCELERATED Manuel M. T. Chakravarty  

E-Print Network (OSTI)

HASKELL ARRAYS, ACCELERATED USING GPUS Manuel M. T. Chakravarty University of New South Wales JOINT, memory-access patterns, etc. Portability... Monday, 7 September 2009 #12;OTHER COMPUTE ACCELERATOR ACCELERATOR ARCHITECTURES Goal: portable data parallelism Tesla T10 GPU Monday, 7 September 2009 #12;OTHER

Chakravarty, Manuel

256

E-Print Network 3.0 - array shows potential Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

COVERAGE Summary: , and then shows how to apply these concepts to the testing of software. Orthogonal arrays and covering arrays... the requirements of a covering array,...

257

The Sloan Digital Sky Survey Quasar Lens Search. III Constraints on Dark Energy From The Third Data Release Quasar Lens Catalog  

SciTech Connect

We present cosmological results from the statistics of lensed quasars in the Sloan Digital Sky Survey (SDSS) Quasar Lens Search. By taking proper account of the selection function, we compute the expected number of quasars lensed by early-type galaxies and their image separation distribution assuming a flat universe, which is then compared with 7 lenses found in the SDSS Data Release 3 to derive constraints on dark energy under strictly controlled criteria. For a cosmological constant model (w = -1) we obtain {Omega}{sub {Lambda}} = 0.74{sub -0.15}{sup +0.11}(stat.){sub -0.06}{sup +0.13}(syst.). Allowing w to be a free parameter we find {Omega}{sub M} = 0.26{sub -0.06}{sup +0.07}(stat.){sub -0.05}{sup +0.03}(syst.) and w = -1.1 {+-} 0.6(stat.){sub -0.5}{sup +0.3}(syst.) when combined with the constraint from the measurement of baryon acoustic oscillations in the SDSS luminous red galaxy sample. Our results are in good agreement with earlier lensing constraints obtained using radio lenses, and provide additional confirmation of the presence of dark energy consistent with a cosmological constant, derived independently of type Ia supernovae.

Oguri, M; Inada, N; Strauss, M A; Kochanek, C S; Richards, G T; Schneider, D P; Becker, R H; Fukugita, M; Gregg, M D; Hall, P B; Hennawi, J F; Johnston, D E; Kayo, I; Keeton, C R; Pindor, B; Shin, M; Turner, E; White, R L; York, D G; Anderson, S F; Bahcall, N A; Brunner, R J; Burles, S; Castander, F J; Chiu, K; Clocchiatti, A; Einsenstein, D; Frieman, J; Kawano, Y; Lupton, R; Morokuma, T; Rix, H; Scranton, R; Sheldon, E S

2007-09-12T23:59:59.000Z

258

The Sloan Digital Sky Survey Quasar Lens Search. III. Constraints on Dark Energy from the Third Data Release Quasar Lens Catalog  

Science Journals Connector (OSTI)

We present cosmological results from the statistics of lensed quasars in the Sloan Digital Sky Survey (SDSS) Quasar Lens Search. By taking proper account of the selection function, we compute the expected number of quasars lensed by early-type galaxies and their image separation distribution assuming a flat universe, which is then compared with seven lenses found in the SDSS Data Release 3 to derive constraints on dark energy under strictly controlled criteria. For a cosmological constant model (w = ?1) we obtain ?? = 0.74+0.11 ?0.15(stat.)+0.13 ?0.06(syst.). Allowing w to be a free parameter we find ?M = 0.26+0.07 ?0.06(stat.)+0.03 ?0.05(syst.) and w = ?1.1 ± 0.6(stat.)+0.3 ?0.5(syst.) when combined with the constraint from the measurement of baryon acoustic oscillations in the SDSS luminous red galaxy sample. Our results are in good agreement with earlier lensing constraints obtained using radio lenses, and provide additional confirmation of the presence of dark energy consistent with a cosmological constant, derived independently of type Ia supernovae.

Masamune Oguri; Naohisa Inada; Michael A. Strauss; Christopher S. Kochanek; Gordon T. Richards; Donald P. Schneider; Robert H. Becker; Masataka Fukugita; Michael D. Gregg; Patrick B. Hall; Joseph F. Hennawi; David E. Johnston; Issha Kayo; Charles R. Keeton; Bartosz Pindor; Min-Su Shin; Edwin L. Turner; Richard L. White; Donald G. York; Scott F. Anderson; Neta A. Bahcall; Robert J. Brunner; Scott Burles; Francisco J. Castander; Kuenley Chiu; Alejandro Clocchiatti; Daniel Eisenstein; Joshua A. Frieman; Yozo Kawano; Robert Lupton; Tomoki Morokuma; Hans-Walter Rix; Ryan Scranton; Erin Scott Sheldon

2008-01-01T23:59:59.000Z

259

Design of a high index contrast arrayed waveguide grating  

E-Print Network (OSTI)

Arrayed waveguide gratings (AWGs) are useful structures for the implementation of wavelength division multiplexing. The AWG consists of an input splitter, a dispersive waveguide array which creates the wavelength demultiplexing ...

Lang, Ryan N. (Ryan Nathan)

2003-01-01T23:59:59.000Z

260

HEXAGONAL ARRAY STRUCTURE FOR 2D NDE APPLICATIONS  

SciTech Connect

This paper describes a combination of simulation and experimentation to evaluate the advantages offered by utilizing a hexagonal shaped array element in a 2D NDE array structure. The active material is a 1-3 connectivity piezoelectric composite structure incorporating triangular shaped pillars--each hexagonal array element comprising six triangular pillars. A combination of PZFlex, COMSOL and Matlab has been used to simulate the behavior of this device microstructure, for operation around 2.25 MHz, with unimodal behavior and low levels of mechanical cross-coupling predicted. Furthermore, the application of hexagonal array elements enables the array aperture to increase by approximately 30%, compared to a conventional orthogonal array matrix and hence will provide enhanced volumetric coverage and SNR. Prototype array configurations demonstrate good corroboration of the theoretically predicted mechanical cross-coupling between adjacent array elements (approx23 dB).

Dziewierz, J.; Ramadas, S. N.; Gachagan, A.; O'Leary, R. L. [Centre for Ultrasonic Engineering, Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow, G1 1XW (United Kingdom)

2010-02-22T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

AAO nanopore arrays: A practical entrée to nanostructures  

Science Journals Connector (OSTI)

We discuss the fabrication of anodized aluminumnanopore arrays by electrochemical means using inexpensive and readily available equipment. The arrays of pores exhibit short-range hexagonal order with diameters ranging from ?7 nm to hundreds of nanometers. The pore diameter and spacing are varied by changing the anodization conditions. We have used nanopore arrays to fabricate arrays of bismuthnanowires and as masks for x-ray lithography.

S. A. Knaack; M. Redden; M. Onellion

2004-01-01T23:59:59.000Z

262

BP: Beyond Petroleum? Published by GlobaLens, a division of the William Davidson Institute at the University of Michigan.  

E-Print Network (OSTI)

BP: Beyond Petroleum? Published by GlobaLens, a division of the William Davidson Institute of British Petroleum (BP). Prior to assuming the position of CEO, Dudley had been in charge of BP's oil spill and production of crude petroleum and the mining and Source: National Oceanic and Atmospheric Administration

Edwards, Paul N.

263

Design and fabrication of PMMA-micromachined fluid lens based on electromagnetic actuation on PMMA–PDMS bonded membrane  

Science Journals Connector (OSTI)

The fabrication of a poly(methyl methacrylate) (PMMA)-micromachined fluid lens with an optimally designed built-in electromagnetic actuator was demonstrated in this study. Through a finite element method, the number of winding turns and the distance between magnetic moments were estimated to design an effective and miniaturized electromagnetic actuator. The lens body composed of PMMA structures was simply and rapidly micromachined using computer numerical control micro-milling. The poly(dimethylsiloxane) (PDMS) membranes for electromagnetic actuation were bonded to the PMMA structures by using the proposed PMMA–PDMS bonding technique, which uses an SiO2 intermediate layer. A physical repulsive force produced by the electromagnetic actuator applies a controllable fluidic pressure to a fluidic chamber that is sealed with the PDMS membrane, thus allowing dynamic focusing. The focus tunability of the fabricated lens was 67 diopters with a focus hysteresis of less than 1 mm and a response time of 2 ms. The solenoid of the built-in actuator showed negligible thermal crosstalk to the lens.

June Kyoo Lee; Kyung-Woo Park; Ju Chan Choi; Hak-Rin Kim; Seong Ho Kong

2012-01-01T23:59:59.000Z

264

PHYSICAL REVIEW E 84, 041402 (2011) Ice-lens formation and geometrical supercooling in soils and other colloidal materials  

E-Print Network (OSTI)

in the prediction of macroscopic frost-heave rates. DOI: 10.1103/PhysRevE.84.041402 PACS number(s): 82.70.Dd, 46PHYSICAL REVIEW E 84, 041402 (2011) Ice-lens formation and geometrical supercooling in soils, Department of Physics and Program in Applied Mathematics, Yale University, New Haven, Connecticut, USA

Wettlaufer, John S.

265

Figure 1: Artificially colored image of the plasma produced with a cylindrical lens. The laser travels in the Z-  

E-Print Network (OSTI)

-dimension to form a long focus. Progress on Plasma Lens Experiments at the Final Focus Test Beam* P. Kwok2, P. Chen of the supersonic gas jet as the plasma source, and study on focused beam size measurement techniques. Most demonstrate plasma focusing in a setting close to the true high energy collider with negligible induced

McDonald, Kirk

266

Firmographic analysis in the previous coal mining area of Lens in the French NordPasdeCalais Region  

E-Print Network (OSTI)

Firmographic analysis in the previous coal mining area of Lens in the French Nord: Department of Transport Economics and Sociology 20 rue Elisée Reclus BP 317 59666 Villeneuve d'Ascq Cedex and Technology for Transport, Development and Networks Address: Department of Transport Economics

Boyer, Edmond

267

Triangular Lattices for Mutual Coupling Reduction in Patch Antenna Arrays  

E-Print Network (OSTI)

Triangular Lattices for Mutual Coupling Reduction in Patch Antenna Arrays Nurul H. Noordin, Ahmed O a triangular lattice configuration as a technique to reduce the mutual coupling in patch antenna arrays. A 4-element circular patch array with a triangular lattice is simulated and compared against a 4-element

Arslan, Tughrul

268

Symposium on the Nature of Science—Janet Conrad and Len Bugel  

NLE Websites -- All DOE Office Websites (Extended Search)

HOW DO WE KNOW? HOW DO WE KNOW? Janet Conrad and Len Bugel Watch the talk (Running time 55:41) Video in Frame Detached Video Some users have reported problems with the "Video in Frame" option. If you have problems, please try the "Detached Video" option. Requires RealPlayer 7.0 or higher. Get RealPlayer If you can't see it, how do we know it is there? Neutrinos are fundamental particles with masses too small to measure. Because they are neutral they are not "visible" in detectors, which rely on response to electric charge. The neutrino studies at Fermilab demonstrate how science is a process of fitting the pieces together, not just a collection of facts. How can we communicate this to high school students? We will use the theme of cosmic

269

Microsoft PowerPoint - eLens status Anerella 083011.pptx  

NLE Websites -- All DOE Office Websites (Extended Search)

August 30 2011 August 30 2011 August 30, 2011 1 E-Lens - General * G 10 wiring board delivered; to be assembled by RM * G-10 wiring board delivered; to be assembled by RM (after jury duty) (SP) * All parts for vertical cold test assembly submitted to CS (SP) to CS (SP) * Cold mass, cryostat drawing work continues (LR/SP/PK!) Yoke material due 8/29 * Yoke material - due 8/29 * Coil support installation fixture - base plate by tomorrow C t tti fi t M d b itt d PK * Cryostatting fixture Mods submitted - PK * Coil status - following slides 2 Corrector coils * 1 st Corrector: * Final cure complete * Final cure complete * Electrical tests underway (hypot complete) * 2 nd Corrector: * (8) 0.5 m coils complete (DM) 3 Main Solenoid Coils * 1 st main solenoid * Machining complete * Electrical tests complete * Waiting for stainless steel support W

270

Microsoft PowerPoint - eLens status Anerella 101111.pptx  

NLE Websites -- All DOE Office Websites (Extended Search)

October 11 2011 October 11 2011 October 11, 2011 1 E-Lens - General * All parts for vertical cold test assembly in process in CS, expected delivery 10/28 (SP) C ld t t d i k ti * Cold mass, cryostat drawing work continues (LR/SP/PK/SS) * Yoke material - received, in CS for machining f d P * Cryostatting fixture Mods in CS - PK * Vertical cold test top hat, hanging support design complete, released to CS * Magnetic Needle Tooling - all parts in CS, some parts complete, expected delivery ~ 10/30 (PK) * Coil status - following slides g 2 Corrector coils * 1 st Corrector: * Electrical tests complete * Electrical tests complete * Needs helium holes in FG * 2 nd Corrector: * (20) 0.5 m coil electrical tests complete (JE) * (4) 2.5 m coils wound (DM) 3 Main Solenoid Coils 1 st main solenoid * All stainless steel support sleeve

271

Echelle grating multi-order imaging spectrometer utilizing a catadioptric lens  

DOE Patents (OSTI)

A cryogenically cooled imaging spectrometer that includes a spectrometer housing having a first side and a second side opposite the first side. An entrance slit is on the first side of the spectrometer housing and directs light to a cross-disperser grating. An echelle immersions grating and a catadioptric lens are positioned in the housing to receive the light. A cryogenically cooled detector is located in the housing on the second side of the spectrometer housing. Light from the entrance slit is directed to the cross-disperser grating. The light is directed from the cross-disperser grating to the echelle immersions grating. The light is directed from the echelle immersions grating to the cryogenically cooled detector on the second side of the spectrometer housing.

Chrisp, Michael P; Bowers, Joel M

2014-05-27T23:59:59.000Z

272

z-pinch plasma lens focusing of a heavy-ion beam  

Science Journals Connector (OSTI)

For the first time a heavy-ion beam was focused using a z-pinch plasma lens. The diameter of an incident, parallel, 460-MeV argon-ion beam was reduced from ?8 mm (FWHM) to ?2 mm within 230 mm downstream of the plasma. Inside a cylindrically symmetric plasma column a high-gradient, azimuthal magnetic field is produced during a z-pinch discharge. For axially moving, high-energy charged particles this field configuration provides strong, first-order focusing simultaneously in both transversal planes. The measured spot size agrees with numerical calculations taking into account the finite beam emittance, and charge exchange as well as energy-loss processes contributing to aberrations.

E. Boggasch; J. Jacoby; H. Wahl; K.-G. Dietrich; D. H. H. Hoffmann; W. Laux; M. Elfers; C. R. Haas; V. P. Dubenkov; A. A. Golubev

1991-04-01T23:59:59.000Z

273

Plasma-wall interaction in Hall thrusters with magnetic lens configuration  

SciTech Connect

Some recently developed Hall thrusters utilize a magnetic field configuration in which the field lines penetrate the thruster walls at a high incidence angle. This so-called magnetic lens leads to an electric field pointing away from the walls, which is expected to reduce ion losses and improve thruster efficiency. This configuration also introduces an interesting behavior in the sheath formation. At sufficiently large angles, ions are repelled from the wall, and sheath collapse is expected. We use a plasma simulation code to investigate this phenomenon in detail. We consider the role of the magnetic field incidence angle, secondary electron emission, and a magnetic mirror. Numerical study confirms the theoretical predictions, and at large angles, ions are seen to turn away from the wall. We also consider the role of the magnetic field geometry on ion wall flux and channel erosion, and observe reduction in both quantities as the magnetic field incidence angle is increased.

Brieda, Lubos; Keidar, Michael [Department of Mechanical and Aerospace Engineering, George Washington University, 801 22nd St., Washington, DC 20052 (United States)

2012-06-15T23:59:59.000Z

274

Parity Dependence in Strong Lens Systems as a Probe of Dark Matter Substructure  

E-Print Network (OSTI)

The amount of mass in small, dark matter clumps within galaxies (substructure) is an important test of cold dark matter. One approach to measuring the substructure mass fraction is to analyze the fluxes of images that have been strongly lensed by a galaxy. Flux ratios between images that are anomalous with respect to smooth (no substructure) models have previously suggested that there is a greater amount of substructure than found in dark matter simulations. One measure of anomalous flux ratios is parity dependence -- that the fluxes of different images of a source are perturbed differently. In this paper, we discuss parity dependence as a probe of dark matter substructure. We find that reproducing the observed parity dependence requires a significant alignment between concentrated dark matter clumps and images. The results may imply a larger fraction of mass in substructures than suggested by some dark matter simulations and that the observed parity dependence is unlikely to be reproduced by luminous satellites of lens galaxies.

Jacqueline Chen

2008-10-11T23:59:59.000Z

275

Posterior chamber phakic intraocular lens to correct myopia: Long-term follow-up  

Science Journals Connector (OSTI)

Purpose To evaluate the long-term safety and efficacy of a refractive phakic intraocular lens (pIOL) (PRL) to correct moderate to high myopia. Setting Department of Ophthalmology, University Medicine Charité Berlin, Berlin, Germany. Design Retrospective cohort study. Methods Uncorrected (UDVA) and corrected (CDVA) distance visual acuities, refraction, intraocular pressure, endothelial cell loss, and adverse events were evaluated. Results The study enrolled 53 eyes (mean spherical equivalent [SE] ?12.17 diopters [D] ± 4.12 [SD]) of 29 patients. The mean age was 34.6 ± 9.2 years and the mean follow-up, 86 ± 21.2 months. The mean UDVA improved from 1.37 ± 0.28 logMAR preoperatively to 0.14 ± 0.19 logMAR at the last postoperative visit (P<.05). The mean CDVA improved from 0.10 ± 0.18 logMAR to ?0.01 ± 0.09 logMAR (P<.05). The overall mean efficacy index and mean safety index were 0.9 and 1.21, respectively, at the last follow-up visit. The mean endothelial cell loss at the last follow-up was 6.4%. The complications were slight posterior chamber (PC) pIOL decentration (5 eyes, 9.4%), severe PC pIOL decentration resulting in pIOL removal (1 eye, 1.8%), glaucoma (4 eyes, 7.5%), clinically significant cortical lens opacification resulting in cataract surgery (4 eyes, 7.5%), clinically asymptomatic anterior subcapsular cataract formation (6 eyes, 11.3%), and retinal detachment (2 eyes, 3.8%). Conclusions Posterior chamber phakic pIOL implantation to correct moderate to high myopia provided predictable and stable refractive results but with a high rate of serious complications over the long term. Financial Disclosure No author has a financial or proprietary interest in any material or method mentioned.

Necip Torun; Eckart Bertelmann; Matthias K.J. Klamann; Anna-Karina Maier; Anja Liekfeld; Johannes Gonnermann

2013-01-01T23:59:59.000Z

276

DEVELOPMENT OF A COMPACT PHOTO-INJECTOR WITH RFFOCUSING LENS FOR SHORT PULSE ELECTRON SOURCE APPLICATION  

SciTech Connect

For development of compact ultrafast electron source system, we are currently designing a short-pulse RF-gun with RF focusing structure by means of a series of comprehensive modeling analysis processes. EM design of a 2.5 cell resonant cavity with input coupler, acceleration dynamics of photo-emitted electron bunch, EM design of RF-lens with input coupler, and phasespace analysis of focused electron bunch are systematically examined with multi-physics simulators. All the features of the 2.856 GHz cavity geometry were precisely engineered for acceleration energies ranging from 100 keV to 500 keV (safety limited) to be powered by our 5 MW S-band klystron. The klystron (Thales TH2163) and modulator system (ScandiNova K1 turnkey system) were successfully installed and tested. Performance tests of the klystron system show peak output power > 5 MW, as per operation specifications. At the quasi-relativistic energies, the electron source is capable of generating 100fC – 1 pC electron bunch with pulse duration close to 30 fs – 1 ps and transverse size of a few hundred microns. PIC simulations have shown that the electron bunch undergoes fast RF acceleration, rapidly reaching the desired energies, which can be controlled by tuning RF injection phase and input driving power. It has been shown that it is possible to also focus/compress the bunch longitudinally using a RF-lens, which would allow us to control the temporal resolution of the system as well. While our primary analysis has been performed on a 2.5 cell design, we are also looking into half-cell (single cavity) design that is expected to provide the same range of beam energy with a simple configuration.

Grabenhofer, Alexander [Northern Illinois University; Eaton, Douglas W. [ScandiNova systems AB, Uppsala, Sweden

2013-09-01T23:59:59.000Z

277

Mesa Top Photovoltaic Array, NREL (Fact Sheet)  

NLE Websites -- All DOE Office Websites (Extended Search)

Mesa Top Photovoltaic Array Mesa Top Photovoltaic Array System Specifications System size: 720 kilowatts (kW) DC Characteristics: Single axis tracker photovoltaic, ground mounted Annual output: 1.2 gigawatt hours (GWh) Location: Top of South Table Mountain, Golden, Colorado Start of operation: December 2008 Financial Terms System ownership: SunEdison financed, built, owns, operates and maintains the system Solar Power and Services Agreement (SPSA): SunEdison and the Western Area Power Administration (WAPA) entered into a 20-year SPSA to provide Solar Energy Services to the Department of Energy (DOE) for use at the National Renewable Energy Laboratory (NREL) Cost to DOE/NREL: There are no up-front costs to DOE or NREL * The price per kilowatt hour (kWh) for the power purchased from the

278

Mesa Top Photovoltaic Array, NREL (Fact Sheet)  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Mesa Top Photovoltaic Array Mesa Top Photovoltaic Array System Specifications System size: 720 kilowatts (kW) DC Characteristics: Single axis tracker photovoltaic, ground mounted Annual output: 1.2 gigawatt hours (GWh) Location: Top of South Table Mountain, Golden, Colorado Start of operation: December 2008 Financial Terms System ownership: SunEdison financed, built, owns, operates and maintains the system Solar Power and Services Agreement (SPSA): SunEdison and the Western Area Power Administration (WAPA) entered into a 20-year SPSA to provide Solar Energy Services to the Department of Energy (DOE) for use at the National Renewable Energy Laboratory (NREL) Cost to DOE/NREL: There are no up-front costs to DOE or NREL * The price per kilowatt hour (kWh) for the power purchased from the

279

Integrated field emission array for ion desorption  

DOE Patents (OSTI)

An integrated field emission array for ion desorption includes an electrically conductive substrate; a dielectric layer lying over the electrically conductive substrate comprising a plurality of laterally separated cavities extending through the dielectric layer; a like plurality of conically-shaped emitter tips on posts, each emitter tip/post disposed concentrically within a laterally separated cavity and electrically contacting the substrate; and a gate electrode structure lying over the dielectric layer, including a like plurality of circular gate apertures, each gate aperture disposed concentrically above an emitter tip/post to provide a like plurality of annular gate electrodes and wherein the lower edge of each annular gate electrode proximate the like emitter tip/post is rounded. Also disclosed herein are methods for fabricating an integrated field emission array.

Resnick, Paul J; Hertz, Kristin L; Holland, Christopher; Chichester, David; Schwoebel, Paul

2013-09-17T23:59:59.000Z

280

Economic analysis of the unified heliostat array  

SciTech Connect

The Unified Heliostat Array (UHA) is comprised of conventional two-axis heliostats mounted on a terraced south-facing wall of a single structure. The arrangement of heliostats on the array is chosen to eliminate or control the degree of inter-heliostat shading and blocking. The UHA was investifated as to cost and optical performance. Two heliostats, the Veda Industrial Heliostat (VIH) and the Repowering Heliostat were investigated in conjunction with the UHA. The UHA was found to be a viable candidate for solar thermal central receiver applications. The UHA-VIH combination was shown to provide very high flux densities and to be suitable for high temperature applications in the 1000/sup 0/K to 2000/sup 0/K range. These temperatures were shown to be achievable even with very small (1 MWt) collector fields.

Not Available

1980-11-07T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

Screening current effects in Josephson junction arrays  

E-Print Network (OSTI)

The purpose of this work is to compare the dynamics of arrays of Josephson junctions in presence of magnetic field in two different frameworks: the so called XY frustrated model with no self inductance and an approach that takes into account the screening currents (considering self inductances only). We show that while for a range of parameters the simpler model is sufficiently accurate, in a region of the parameter space solutions arise that are not contained in the XY model equations.

A. Petraglia; G. Filatrella; G. Rotoli

1995-07-28T23:59:59.000Z

282

Response shaping using a subordinate oscillator array  

Science Journals Connector (OSTI)

Recent research has shown that arrays of small dynamic elements attached to a master structure can be tuned to significantly alter the time or frequency response of the system. Colloquially known as “fuzzy structures ” subordinate oscillators have led to applications including damping radio frequency filtering energy harvesting and micro electro-mechanical system (MEMS) chemical vapor sensing. A passive machinery damping system will be designed and tested for silencing properties. The current subordinate oscillator array (SOA) design consists of a plate of sheet metal with arrays of cantilevers machined of similar but different lengths. These cantilevers will have a range of natural frequencies which correspond to a desired frequency suppression range. When the SOA is mounted to a vibration source it functions as an acoustic meta-material which traps and dissipates energy. This is accomplished by synchronizing the phase and frequency of the cantilevers with machinery peak amplitude frequencies. By designing cantilevers properly the SOA acts as a mechanical broadband filter as opposed to a notch filter. The SOA will be tested primarily for vibration suppression performance but also for sensitivity to tolerance and energy storage density.

John A. Sterling

2014-01-01T23:59:59.000Z

283

Preferential instability in arrays of coupled lasers  

Science Journals Connector (OSTI)

We consider an array of N coupled class-B lasers in a ring geometry. We analyze the stability of the steady-state solutions for small values of the coupling strength and small damping. The problem is motivated by recent studies of laser-diode arrays, but analytical results on the possible instabilities remain limited to the case N=2. We consider N arbitrary and use the coupling strength as the bifurcation parameter. As this parameter increases from zero, we show that the first instability leads to a preferential mode of oscillations. For N even, we study this bifurcation to a time-periodic standing-wave solution and determine the direction of bifurcation. We discuss the bifurcation possibilities in terms of the parameter ?, known as the linewidth-enhancement factor, in semiconductor lasers. Increasing ? destabilizes phase locking between adjacent lasers but leads to a smooth bifurcation to periodic solutions. Inversely, decreasing ? stabilizes the laser array, but the first bifurcation leads to a hard transition to time-dependent solutions. The predictions of our analysis are in agreement with the results of a numerical study of the laser equations.

Ruo-ding Li and Thomas Erneux

1992-10-01T23:59:59.000Z

284

AGN Physics with the Cherenkov Telescope Array  

E-Print Network (OSTI)

The Cherenkov Telescope Array (CTA), currently in its Preparatory Phase, will be the first open observatory for very high energy gamma-rays from galactic and extragalactic sources. The international consortium behind CTA is preparing the construction of two large arrays of Cherenkov telescopes in the Northern and Southern Hemispheres with a performance that will be significantly improved compared to the current generation of arrays. Its increased sensitivity and energy range will give CTA access to a large population of Active Galactic Nuclei (AGN) not yet detected at very high energies and provide much more details on known TeV sources. While the low end of the CTA energy coverage will close the current gap with the Fermi-LAT band, its high energy coverage will open a new window on the sky and help us understand the intrinsic shape of the hardest blazar spectra. We outline the current status of CTA and discuss the science case for AGN physics with the observatory. Predictions for source detections based on e...

Zech, A

2012-01-01T23:59:59.000Z

285

Array of aligned and dispersed carbon nanotubes and method of producing the array  

DOE Patents (OSTI)

An array of aligned and dispersed carbon nanotubes includes an elongate drawn body including a plurality of channels extending therethrough from a first end to a second end of the body, where the channels have a number density of at least about 100,000 channels/mm.sup.2 over a transverse cross-section of the body. A plurality of carbon nanotubes are disposed in each channel, and the carbon nanotubes are sufficiently dispersed and aligned along a length of the channels for the array to comprise an average resistivity per channel of about 9700 .OMEGA.m or less.

Ivanov, Ilia N; Simpson, John T; Hendricks, Troy R

2013-06-11T23:59:59.000Z

286

Array of aligned and dispersed carbon nanotubes and method of producing the array  

DOE Patents (OSTI)

An array of aligned and dispersed carbon nanotubes includes an elongate drawn body including a plurality of channels extending therethrough from a first end to a second end of the body, where the channels have a number density of at least about 100,000 channels/mm.sup.2 over a transverse cross-section of the body. A plurality of carbon nanotubes are disposed in each channel, and the carbon nanotubes are sufficiently dispersed and aligned along a length of the channels for the array to comprise an average resistivity per channel of about 9700 .OMEGA.m or less.

Ivanov, Ilia N. (Knoxville, TN); Simpson, John T. (Clinton, TN); Hendricks, Troy R. (Knoxville, TN)

2012-06-19T23:59:59.000Z

287

PV array simulator development and validation.  

SciTech Connect

The ability to harvest all available energy from a photovoltaic (PV) array is essential if new system developments are to meet levelized cost of energy targets and achieve grid parity with conventional centralized utility power. Therefore, exercising maximum power point tracking (MPPT) algorithms, dynamic irradiance condition operation and startup and shutdown routines and evaluating inverter performance with various PV module fill-factor characteristics must be performed with a repeatable, reliable PV source. Sandia National Laboratories is collaborating with Ametek Programmable Power to develop and demonstrate a multi-port TerraSAS PV array simulator. The simulator will replicate challenging PV module profiles, enabling the evaluation of inverter performance through analyses of the parameters listed above. Energy harvest algorithms have traditionally implemented methods that successfully utilize available energy. However, the quantification of energy capture has always been difficult to conduct, specifically when characterizing the inverter performance under non-reproducible dynamic irradiance conditions. Theoretical models of the MPPT algorithms can simulate capture effectiveness, but full validation requires a DC source with representative field effects. The DC source being developed by Ametek and validated by Sandia is a fully integrated system that can simulate an IV curve from the Solar Advisor Model (SAM) module data base. The PV simulator allows the user to change the fill factor by programming the maximum power point voltage and current parameters and the open circuit voltage and short circuit current. The integrated PV simulator can incorporate captured irradiance and module temperature data files for playback, and scripted profiles can be generated to validate new emerging hardware embedded with existing and evolving MPPT algorithms. Since the simulator has multiple independent outputs, it also has the flexibility to evaluate an inverter with multiple MPPT DC inputs. The flexibility of the PV simulator enables the validation of the inverter's capability to handle vastly different array configurations.

Kuszmaul, Scott S.; Gonzalez, Sigifredo; Lucca, Roberto (Ametek Programmable Power, San Diego, CA); Deuel, Don (Ametek Programmable Power, San Diego, CA)

2010-06-01T23:59:59.000Z

288

Plasmon resonant cavities in vertical nanowire arrays  

DOE Patents (OSTI)

Tunable plasmon resonant cavity arrays in paired parallel nanowire waveguides are presented. Resonances can be observed when the waveguide length is an odd multiple of quarter plasmon wavelengths, consistent with boundary conditions of node and antinode at the ends. Two nanowire waveguides can satisfy the dispersion relation of a planar metal-dielectric-metal waveguide of equivalent width equal to the square field average weighted gap. Confinement factors of over 10.sup.3 are possible due to plasmon focusing in the inter-wire space.

Bora, Mihail; Bond, Tiziana C.; Fasenfest, Benjamin J.; Behymer, Elaine M.

2014-07-15T23:59:59.000Z

289

Collective Resonances in Gold Nanoparticle Arrays  

Science Journals Connector (OSTI)

We present experimental evidence of sharp spectral features in the optical response of 2D arrays of gold nanorods. A simple coupled dipole model is used to describe the main features of the observed spectral line shape. The resonance involves an interplay between the excitation of plasmons localized on the particles and diffraction resulting from the scattering by the periodic arrangement of these particles. We investigate this interplay by varying the particle size, aspect ratio, and interparticle spacing, and observe the effect on the position, width, and intensity of the sharp spectral feature.

Baptiste Auguié and William L. Barnes

2008-09-30T23:59:59.000Z

290

Synchronized Andreev transmission in SNS junction arrays.  

SciTech Connect

We construct a nonequilibrium theory for the charge transfer through a diffusive array of alternating normal (N) and superconducting (S) islands comprising an SNSNS junction, with the size of the central S island being smaller than the energy relaxation length. We demonstrate that in the nonequilibrium regime the central island acts as Andreev retransmitter with the Andreev conversions at both NS interfaces of the central island correlated via above-the-gap transmission and Andreev reflection. This results in a synchronized transmission at certain resonant voltages which in experiments is seen as a sequence of spikes in the differential conductivity.

Chtchelkatchev, N. M.; Baturina, T. I.; Glatz, A.; Vinokur, V. M.; Materials Science Division; Russian Academy of Sciences; Moscow Inst. of Physics and Technology; Inst. Semiconductor Physics

2010-07-29T23:59:59.000Z

291

Dissipative plasmon solitons in graphene nanodisk arrays  

E-Print Network (OSTI)

We study nonlinear modes in one-dimensional arrays of doped graphene nanodisks with Kerr-type nonlinear response in the presence of an external electric field. We present the theoretical model describing the evolution of the disks' polarizations, taking into account intrinsic graphene losses and dipole-dipole coupling between the graphene nanodisks. We reveal that this nonlinear system can support discrete dissipative scalar solitons of both longitudinal and transverse polarizations, as well as vector solitons composed of two mutually coupled polarization components. We demonstrate the formation of stable resting and moving localized modes under controlling guidance of the external driving field.

Smirnova, Daria A; Smirnov, Lev A; Kivshar, Yuri S

2014-01-01T23:59:59.000Z

292

Working Group Reports A Short-Wave Radiometer Array Across  

NLE Websites -- All DOE Office Websites (Extended Search)

9 9 Working Group Reports A Short-Wave Radiometer Array Across the Tropical Pacific Ocean as a Component of the TOGA-TAO Buoy Array R. M. Reynolds Brookhaven National Laboratory Upton, New York Introduction The purpose of this document is to bring together pertinent information concerning the NOAA TOGA-TAO buoy array so that a decision can be made for the following questions: 1. Are the scientific gains from an array of short-wave radiation sensors in the equatorial Pacific Ocean sufficiently impelling that DOE/ARM should provide financial and material support to NOAA/PMEL to install and operate this array? 2. What scientists and/or scientific studies would directly benefit from such a data set? 3. What should that array look like? That is, what sub-set of buoys should be so implemented given the per-buoy

293

Acoustic Array Development for Wind Turbine Noise Characterization  

SciTech Connect

This report discusses the design and use of a multi-arm, logarithmic spiral acoustic array by the National Renewable Energy Laboratory (NREL) for measurement and characterization of wind turbine-generated noise. The array was developed in collaboration with a team from the University of Colorado Boulder. This design process is a continuation of the elliptical array design work done by Simley. A description of the array system design process is presented, including array shape design, mechanical design, design of electronics and the data acquisition system, and development of post-processing software. System testing and calibration methods are detailed. Results from the initial data acquisition campaign are offered and discussed. Issues faced during this initial deployment of the array are presented and potential remedies discussed.

Buck, S.; Roadman, J.; Moriarty, P.; Palo, S.

2013-11-01T23:59:59.000Z

294

Definition: DC Resistivity Survey (Dipole-Dipole Array) | Open Energy  

Open Energy Info (EERE)

DC Resistivity Survey (Dipole-Dipole Array) DC Resistivity Survey (Dipole-Dipole Array) Jump to: navigation, search Dictionary.png DC Resistivity Survey (Dipole-Dipole Array) The Dipole-Dipole array is a type of electrode configuration for a Direct-Current Resistivity Survey and is defined by its electrode array geometry.[1] View on Wikipedia Wikipedia Definition References ↑ http://appliedgeophysics.berkeley.edu/dc/EM46.pdf Ret LikeLike UnlikeLike You like this.Sign Up to see what your friends like. rieved from "http://en.openei.org/w/index.php?title=Definition:DC_Resistivity_Survey_(Dipole-Dipole_Array)&oldid=596974" Category: Definitions What links here Related changes Special pages Printable version Permanent link Browse properties 429 Throttled (bot load) Error 429 Throttled (bot load) Throttled (bot load)

295

Coordinated garbage collection for raid array of solid state disks  

SciTech Connect

An optimized redundant array of solid state devices may include an array of one or more optimized solid-state devices and a controller coupled to the solid-state devices for managing the solid-state devices. The controller may be configured to globally coordinate the garbage collection activities of each of said optimized solid-state devices, for instance, to minimize the degraded performance time and increase the optimal performance time of the entire array of devices.

Dillow, David A; Ki, Youngjae; Oral, Hakki S; Shipman, Galen M; Wang, Feiyi

2014-04-29T23:59:59.000Z

296

Design of series-parallel connected thermionic converter arrays  

SciTech Connect

Applications of thermionic converters require that a large number of converters be connected together in a series-parallel array in order to provide a useful output voltage. Such an array also serves to insure a very high overall system reliability, despite possible failures of individual converters. This paper predicts the effects of a nonuniform distribution of input power on the performance of such an array. 9 refs.

Mcvey, J.B.; Britt, E.J.; Fitzpatrick, G.O.; Dick, R.S.

1981-01-01T23:59:59.000Z

297

Halbach array DC motor/generator  

DOE Patents (OSTI)

A new configuration of DC motor/generator is based on a Halbach array of permanent magnets. This motor does not use ferrous materials so that the only losses are winding losses and losses due to bearings and windage. An "inside-out" design is used as compared to a conventional motor/generator design. The rotating portion, i.e., the rotor, is on the outside of the machine. The stationary portion, i.e., the stator, is formed by the inside of the machine. The rotor contains an array of permanent magnets that provide a uniform field. The windings of the motor are placed in or on the stator. The stator windings are then "switched" or "commutated" to provide a DC motor/generator much the same as in a conventional DC motor. The commutation can be performed by mechanical means using brushes or by electronic means using switching circuits. The invention is useful in electric vehicles and adjustable speed DC drives.

Merritt, Bernard T. (Livermore, CA); Dreifuerst, Gary R. (Livermore, CA); Post, Richard F. (Walnut Creek, CA)

1998-01-01T23:59:59.000Z

298

Improved selection in totally monotone arrays  

SciTech Connect

This paper's main result is an O(({radical}{bar m}lgm)(n lg n) + mlg n)-time algorithm for computing the kth smallest entry in each row of an m {times} n totally monotone array. (A two-dimensional A = a(i,j) is totally monotone if for all i{sub 1} < i{sub 2} and j{sub 1} < j{sup 2}, < a(i{sub 1},j{sub 2}) implies a(i{sub 2},j{sub 1})). For large values of k (in particular, for k=(n/2)), this algorithm is significantly faster than the O(k(m+n))-time algorithm for the same problem due to Kravets and Park. An immediate consequence of this result is an O(n{sup 3/2} lg{sup 2}n)-time algorithm for computing the kth nearest neighbor of each vertex of a convex n-gon. In addition to the main result, we also give an O(n lg m)-time algorithm for computing an approximate median in each row of an m {times} n totally monotone array; this approximate median is an entry whose rank in its row lies between (n/4) and (3n/4) {minus} 1. 20 refs., 3 figs.

Mansour, Y. (Harvard Univ., Cambridge, MA (United States). Aiken Computation Lab.); Park, J.K. (Sandia National Labs., Albuquerque, NM (United States)); Schieber, B. (International Business Machines Corp., Yorktown Heights, NY (United States). Thomas J. Watson Research Center); Sen, S. (AT and T Bell Labs., Murray Hill, NJ (United States))

1991-01-01T23:59:59.000Z

299

Quantum manipulation and simulation using Josephson junction arrays  

E-Print Network (OSTI)

We discuss the prospect of using quantum properties of large scale Josephson junction arrays for quantum manipulation and simulation. We study the collective vibrational quantum modes of a Josephson junction array and show that they provide a natural and practical method for realizing a high quality cavity for superconducting qubit based QED. We further demonstrate that by using Josephson junction arrays we can simulate a family of problems concerning spinless electron-phonon and electron-electron interactions. These protocols require no or few controls over the Josephson junction array and are thus relatively easy to realize given currently available technology.

Xingxiang Zhou; Ari Mizel

2006-05-01T23:59:59.000Z

300

Intense and Highly Energetic Atmospheric Pressure Plasma Jet Arrays.  

E-Print Network (OSTI)

??This thesis documents the efforts taken to produce highly ionized and concentrated atmospheric pressure plasma using an arrayed atmospheric pressure plasma jet (APPJ) system. The… (more)

Furmanski, John

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

High-Temperature Thermal Array for Next Generation Solar Thermal...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Thermal Array for Next Generation Solar Thermal Power Production Award Number: DE-EE00025828 Report Date: March 15, 2013 PI: Stephen Obrey * Technical approach is focused on...

302

An optical time-delay estimate for the double gravitational lens system B1600+434  

E-Print Network (OSTI)

We present optical I-band light curves of the gravitationally lensed double QSO B1600+434 from observations obtained at the Nordic Optical Telescope (NOT) between April 1998 and November 1999. The photometry has been performed by simultaneous deconvolution of all the data frames, involving a numerical lens galaxy model. Four methods have been applied to determine the time delay between the two QSO components, giving a mean estimate of \\Delta_t = 51+/-4 days (95% confidence level). This is the fourth optical time delay ever measured. Adopting a Omega=0.3, Lambda=0 Universe and using the mass model of Maller et al. (2000), this time-delay estimate yields a Hubble parameter of H_0=52 (+14, -8) km s^-1 Mpc^-1 (95% confidence level) where the errors include time-delay as well as model uncertainties. There are time-dependent offsets between the two (appropriately shifted) light curves that indicate the presence of external variations due to microlensing.

I. Burud; J. Hjorth; A. O. Jaunsen; M. I. Andersen; H. Korhonen; J. W. Clasen; J. Pelt; F. P. Pijpers; P. Magain; R. OEstensen

2000-07-11T23:59:59.000Z

303

The Deep Lens Survey Transient Search. I. Short Timescale and Astrometric Variability  

Science Journals Connector (OSTI)

We report on the methodology and first results from the Deep Lens Survey (DLS) transient search. We utilize image subtraction on survey data to yield all sources of optical variability down to 24th magnitude. Images are analyzed immediately after acquisition, at the telescope, and in near-real time, to allow for follow-up in the case of time-critical events. All classes of transients are posted to the World Wide Web upon detection. Our observing strategy allows sensitivity to variability over several decades in timescale. The DLS is the first survey to classify and report all types of photometric and astrometric variability detected, including solar system objects, variable stars, supernovae, and short timescale phenomena. Three unusual optical transient (OT) events were detected, flaring on 1000 s timescales. All three events were seen in the B passband, suggesting blue color indices for the phenomena. One event (OT 20020115) is determined to be from a flaring Galactic dwarf star of spectral type dM4. From the remaining two events, we find an overall rate of ? = 1.4 events deg-2 day-1 on 1000 s timescales, with a 95% confidence limit of ? R passband yields an upper 95% confidence limit on short-timescale astronomical variability in the range 19.5 R R -2 day-1. We report also on our ensemble of astrometrically variable objects, as well as an example of photometric variability with an undetected precursor.

A. C. Becker; D. M. Wittman; P. C. Boeshaar; A. Clocchiatti; I. P. Dell'Antonio; D. A. Frail; J. Halpern; V. E. Margoniner; D. Norman; J. A. Tyson; R. A. Schommer

2004-01-01T23:59:59.000Z

304

The Deep Lens Survey Transient Search I Short Timescale and Astrometric Variability  

E-Print Network (OSTI)

We report on the methodology and first results from the Deep Lens Survey transient search. We utilize image subtraction on survey data to yield all sources of optical variability down to 24th magnitude. Images are analyzed immediately after acquisition, at the telescope and in near-real time, to allow for followup in the case of time-critical events. All classes of transients are posted to the web upon detection. Our observing strategy allows sensitivity to variability over several decades in timescale. The DLS is the first survey to classify and report all types of photometric and astrometric variability detected, including solar system objects, variable stars, supernovae, and short timescale phenomena. Three unusual optical transient events were detected, flaring on thousand-second timescales. All three events were seen in the B passband, suggesting blue color indices for the phenomena. One event (OT 20020115) is determined to be from a flaring Galactic dwarf star of spectral type dM4. From the remaining tw...

Becker, A C; Boeshaar, P C; Clocchiatti, A; Dell'Antonio, I P; Frail, D A; Halpern, J; Margoniner, V E; Norman, D; Tyson, J A; Schommer, R A

2004-01-01T23:59:59.000Z

305

NORTHWEST RUSSIA AS A LENS FOR CHANGE IN THE RUSSIAN FEDERATION  

SciTech Connect

The region of Northwest Russia – encompassing the Kola Peninsula and the Arctic seas to its north – offers a lens through which to view the political, economic, ecological and cultural change occurring in the Russian Federation (RF) today. Amidst the upheaval that followed the collapse of the Soviet Union, this region was left to address the legacy of a Cold War history in which it was home to the Soviet (and now Russian) Navy’s Northern Fleet. This paper addresses the naval nuclear legacy from an ecological and environmental and perspective, first addressing the situation of radioactive contamination of the region. The focus then turns to one of the largest problems facing the RF today: the management and disposal of SNF and RW, much of which was produced by the Northern Fleet. Through the international programs to address these issues, and Russia's development of a national infrastructure to support spent nuclear fuel and waste management, the author discusses political, economic, environmental and cultural change in Russia.

Seward, Amy M.

2009-04-18T23:59:59.000Z

306

GALAXY-MASS CORRELATIONS ON 10 Mpc SCALES IN THE DEEP LENS SURVEY  

SciTech Connect

We examine the projected correlation of galaxies with mass from small scales (Lens Survey, we use photometric redshifts and stacked weak gravitational lensing shear tomography out to radial scales of 1 Degree-Sign from the centers of foreground galaxies. We detect correlated mass density from multiple halos and large-scale structure at radii larger than the virial radius and find the first observational evidence for growth in the galaxy-mass correlation on 10 Mpc scales with decreasing redshift and fixed range of luminosity. For a fixed range of redshift, we find a scaling of projected halo mass with rest-frame luminosity similar to previous studies at lower redshift. We control systematic errors in shape measurement and photometric redshift, enforce volume completeness through absolute magnitude cuts, and explore residual sample selection effects via simulations.

Choi, A.; Tyson, J. A.; Morrison, C. B.; Jee, M. J.; Schmidt, S. J.; Wittman, D. M. [Physics Department, University of California, One Shields Avenue, Davis, CA 95616 (United States); Margoniner, V. E., E-mail: choi@roe.ac.uk [Physics and Astronomy Department, California State University, Sacramento, CA 95819 (United States)

2012-11-10T23:59:59.000Z

307

Quantum computing with atomic Josephson junction arrays  

SciTech Connect

We present a quantum computing scheme with atomic Josephson junction arrays. The system consists of a small number of atoms with three internal states and trapped in a far-off-resonant optical lattice. Raman lasers provide the 'Josephson' tunneling, and the collision interaction between atoms represent the 'capacitive' couplings between the modes. The qubit states are collective states of the atoms with opposite persistent currents. This system is closely analogous to the superconducting flux qubit. Single-qubit quantum logic gates are performed by modulating the Raman couplings, while two-qubit gates result from a tunnel coupling between neighboring wells. Readout is achieved by tuning the Raman coupling adiabatically between the Josephson regime to the Rabi regime, followed by a detection of atoms in internal electronic states. Decoherence mechanisms are studied in detail promising a high ratio between the decoherence time and the gate operation time.

Tian Lin; Zoller, P. [Institute for Theoretical Physics, University of Innsbruck, A-6020 Innsbruck (Austria)

2003-10-01T23:59:59.000Z

308

Quantum Computing with Atomic Josephson Junction Arrays  

E-Print Network (OSTI)

We present a quantum computing scheme with atomic Josephson junction arrays. The system consists of a small number of atoms with three internal states and trapped in a far-off resonant optical lattice. Raman lasers provide the "Josephson" tunneling, and the collision interaction between atoms represent the "capacitive" couplings between the modes. The qubit states are collective states of the atoms with opposite persistent currents. This system is closely analogous to the superconducting flux qubit. Single qubit quantum logic gates are performed by modulating the Raman couplings, while two-qubit gates result from a tunnel coupling between neighboring wells. Readout is achieved by tuning the Raman coupling adiabatically between the Josephson regime to the Rabi regime, followed by a detection of atoms in internal electronic states. Decoherence mechanisms are studied in detail promising a high ratio between the decoherence time and the gate operation time.

Lin Tian; P. Zoller

2003-06-12T23:59:59.000Z

309

Gauge Theories of Josephson Junction Arrays  

E-Print Network (OSTI)

We show that the zero-temperature physics of planar Josephson junction arrays in the self-dual approximation is governed by an Abelian gauge theory with periodic mixed Chern-Simons term describing the charge-vortex coupling. The periodicity requires the existence of (Euclidean) topological excitations which determine the quantum phase structure of the model. The electric-magnetic duality leads to a quantum phase transition between a superconductor and a superinsulator at the self-dual point. We also discuss in this framework the recently proposed quantum Hall phases for charges and vortices in presence of external offset charges and magnetic fluxes: we show how the periodicity of the charge-vortex coupling can lead to transitions to anyon superconductivity phases. We finally generalize our results to three dimensions, where the relevant gauge theory is the so-called BF system, with an antisymmetric Kalb-Ramond gauge field.

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

1995-11-23T23:59:59.000Z

310

Pin stack array for thermoacoustic energy conversion  

DOE Patents (OSTI)

A thermoacoustic stack for connecting two heat exchangers in a thermoacoustic energy converter provides a convex fluid-solid interface in a plane perpendicular to an axis for acoustic oscillation of fluid between the two heat exchangers. The convex surfaces increase the ratio of the fluid volume in the effective thermoacoustic volume that is displaced from the convex surface to the fluid volume that is adjacent the surface within which viscous energy losses occur. Increasing the volume ratio results in an increase in the ratio of transferred thermal energy to viscous energy losses, with a concomitant increase in operating efficiency of the thermoacoustic converter. The convex surfaces may be easily provided by a pin array having elements arranged parallel to the direction of acoustic oscillations and with effective radial dimensions much smaller than the thicknesses of the viscous energy loss and thermoacoustic energy transfer volumes.

Keolian, Robert M. (Monterey, CA); Swift, Gregory W. (Santa Fe, NM)

1995-01-01T23:59:59.000Z

311

Alignment method for solar collector arrays  

DOE Patents (OSTI)

The present invention is directed to an improved method for establishing camera fixture location for aligning mirrors on a solar collector array (SCA) comprising multiple mirror modules. The method aligns the mirrors on a module by comparing the location of the receiver image in photographs with the predicted theoretical receiver image location. To accurately align an entire SCA, a common reference is used for all of the individual module images within the SCA. The improved method can use relative pixel location information in digital photographs along with alignment fixture inclinometer data to calculate relative locations of the fixture between modules. The absolute locations are determined by minimizing alignment asymmetry for the SCA. The method inherently aligns all of the mirrors in an SCA to the receiver, even with receiver position and module-to-module alignment errors.

Driver, Jr., Richard B

2012-10-23T23:59:59.000Z

312

A Phased Array Approach to Rock Blasting  

SciTech Connect

A series of laboratory-scale simultaneous two-hole shots was performed in a rock simulant (mortar) to record the shock wave interference patterns produced in the material. The purpose of the project as a whole was to evaluate the usefulness of phased array techniques of blast design, using new high-precision delay technology. Despite high-speed photography, however, we were unable to detect the passage of the shock waves through the samples to determine how well they matched the expected interaction geometry. The follow-up mine-scale tests were therefore not conducted. Nevertheless, pattern analysis of the vectors that would be formed by positive interference of the shockwaves from multiple charges in an ideal continuous, homogeneous, isotropic medium indicate the potential for powerful control of blast design, given precise characterization of the target rock mass.

Leslie Gertsch; Jason Baird

2006-07-01T23:59:59.000Z

313

Solar cells incorporating light harvesting arrays  

DOE Patents (OSTI)

A solar cell incorporates a light harvesting array that comprises: (a) a first substrate comprising a first electrode; and (b) a layer of light harvesting rods electrically coupled to the first electrode, each of the light harvesting rods comprising a polymer of Formula I: X.sup.1.paren open-st.X.sup.m+1).sub.m (I) wherein m is at least 1, and may be from two, three or four to 20 or more; X.sup.1 is a charge separation group (and preferably a porphyrinic macrocycle, which may be one ligand of a double-decker sandwich compound) having an excited-state of energy equal to or lower than that of X.sup.2 ; and X.sup.2 through X.sup.m+1 are chromophores (and again are preferably porphyrinic macrocycles).

Lindsey, Jonathan S. (Raleigh, NC); Meyer, Gerald J. (Baltimore, MD)

2002-01-01T23:59:59.000Z

314

Smart trigger logic for focal plane arrays  

DOE Patents (OSTI)

An electronic device includes a memory configured to receive data representing light intensity values from pixels in a focal plane array and a processor that analyzes the received data to determine which light values correspond to triggered pixels, where the triggered pixels are those pixels that meet a predefined set of criteria, and determines, for each triggered pixel, a set of neighbor pixels for which light intensity values are to be stored. The electronic device also includes a buffer that temporarily stores light intensity values for at least one previously processed row of pixels, so that when a triggered pixel is identified in a current row, light intensity values for the neighbor pixels in the previously processed row and for the triggered pixel are persistently stored, as well as a data transmitter that transmits the persistently stored light intensity values for the triggered and neighbor pixels to a data receiver.

Levy, James E; Campbell, David V; Holmes, Michael L; Lovejoy, Robert; Wojciechowski, Kenneth; Kay, Randolph R; Cavanaugh, William S; Gurrieri, Thomas M

2014-03-25T23:59:59.000Z

315

Analog circuit for controlling acoustic transducer arrays  

DOE Patents (OSTI)

A simplified ananlog circuit is presented for controlling electromechanical transducer pairs in an acoustic telemetry system. The analog circuit of this invention comprises a single electrical resistor which replaces all of the digital components in a known digital circuit. In accordance with this invention, a first transducer in a transducer pair of array is driven in series with the resistor. The voltage drop across this resistor is then amplified and used to drive the second transducer. The voltage drop across the resistor is proportional and in phase with the current to the transducer. This current is approximately 90 degrees out of phase with the driving voltage to the transducer. This phase shift replaces the digital delay required by the digital control circuit of the prior art.

Drumheller, Douglas S. (Cedar Crest, NM)

1991-01-01T23:59:59.000Z

316

Tunneling Qubit Operation on a Protected Josephson Junction Array  

E-Print Network (OSTI)

We discuss a protected quantum computation process based on a hexagon Josephson junction array. Qubits are encoded in the punctured array, which is topologically protected. The degeneracy is related to the number of holes. The topological degeneracy is lightly shifted by tuning the flux through specific hexagons. We also show how to perform single qubit operation and basic quantum gate operations in this system.

Zhi Yin; Sheng-Wen Li; Yi-Xin Chen

2010-01-29T23:59:59.000Z

317

Optical links for cryogenic focal plane array Alan R. Johnston  

E-Print Network (OSTI)

Optical links for cryogenic focal plane array readout Alan R. Johnston Duncan T. H. Liu, MEMBER@jplopto.jpl.nasa.gov 1 Introduction Optical instruments employing cryogenic focal plane arrays must minimize power dissipation on the focal plane. Because cooler power efficiency is low at cryogenic temperatures, reduction

Fossum, Eric R.

318

Automatic Digital Surface Model (DSM) Generation from Linear Array Images  

E-Print Network (OSTI)

Automatic Digital Surface Model (DSM) Generation from Linear Array Images A dissertation submitted-examiner Presented by Li Zhang Zurich 2005 #12;IGP Mitteilungen Nr. 88 Automatic Digital Surface Model (DSM-906467-55-4 #12;DISS. ETH NO. 16078 Automatic Digital Surface Model (DSM) Generation from Linear Array Images

Giger, Christine

319

Current isolating epitaxial buffer layers for high voltage photodiode array  

DOE Patents (OSTI)

An array of photodiodes in series on a common semi-insulating substrate has a non-conductive buffer layer between the photodiodes and the semi-insulating substrate. The buffer layer reduces current injection leakage between the photodiodes of the array and allows optical energy to be converted to high voltage electrical energy.

Morse, Jeffrey D. (Martinez, CA); Cooper, Gregory A. (Pleasant Hill, CA)

2002-01-01T23:59:59.000Z

320

Impulse testing of corporate-fed patch array antennas  

Science Journals Connector (OSTI)

This paper discusses a novel method for detecting faults in antenna arrays. The method, termed Impulse Testing, was developed for corporate-fed patch arrays where the element is fed by a probe and is shorted at its center. Impulse Testing was devised ...

Neil F. Chamberlain

2011-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

GlycoPattern: a web platform for glycan array mining  

Science Journals Connector (OSTI)

......frequent subtree mining algorithm for...mentioned in the review is the only resource...a platform for mining glycan array data...the HTML Canvas standard (Cabanier, 2014...available for mining Glycan Array data...the CFG, but we plan to expand its...on developing standards to represent glycan......

Sanjay B. Agravat; Joel H. Saltz; Richard D. Cummings; David F. Smith

2014-09-01T23:59:59.000Z

322

Timing-driven routing for symmetrical array-based FPGAs  

Science Journals Connector (OSTI)

In this paper we present a timing-driven router for symmetrical array-based FPGAs. The routing resources in the FPGAs consist of segments of various lengths. Researchers have shown that the number of segments, instead of wirelength, used by a net is ... Keywords: computer-aided design of VLSI, field-programmable gate array, layout, synthesis

Yao-Wen Chang; Kai Zhu; D. F. Wong

2000-07-01T23:59:59.000Z

323

Silicon Microwire Arrays for Solar Energy-Conversion Applications  

Science Journals Connector (OSTI)

Silicon Microwire Arrays for Solar Energy-Conversion Applications ... The Si MW array geometry allows for efficient collection of photogenerated carriers from impure materials that have short minority-carrier diffusion lengths while simultaneously allowing for high optical absorption and high external quantum yields for charge-carrier collection. ...

Emily L. Warren; Harry A. Atwater; Nathan S. Lewis

2013-12-09T23:59:59.000Z

324

A Low Noise Readout Circuit for Integrated Electrochemical Biosensor Arrays  

E-Print Network (OSTI)

A Low Noise Readout Circuit for Integrated Electrochemical Biosensor Arrays Jichun Zhang, Nicholas 48823, USA {zhangjic, tromblyn, mason}@egr.msu.edu Abstract This paper presents a low noise electrochemical interface circuit that is tuned to the needs of protein-based biosensor arrays and compatible

Mason, Andrew

325

MICROFLUIDIC DEVICE WITH INTEGRATED ANTIBODY ARRAYS FOR CELL SIGNALLING  

E-Print Network (OSTI)

MICROFLUIDIC DEVICE WITH INTEGRATED ANTIBODY ARRAYS FOR CELL SIGNALLING ANALYSIS J. El-Ali1 , S we present the integration of protein arrays with a microfluidic device for analysis of cell a microfluidic segmented flow device that could achieve rapid stimulus and lysis of cells [1][2]. The device had

326

National Lab 'Flips Switch' on East Coast's Largest Solar Array |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

National Lab 'Flips Switch' on East Coast's Largest Solar Array National Lab 'Flips Switch' on East Coast's Largest Solar Array National Lab 'Flips Switch' on East Coast's Largest Solar Array November 21, 2011 - 12:16pm Addthis An aerial view of the 32-megawatt photovoltaic array of the Long Island Solar Farm, which will produce enough energy to power up to 4,500 local homes. The central Brookhaven National Laboratory campus is seen at left. An aerial view of the 32-megawatt photovoltaic array of the Long Island Solar Farm, which will produce enough energy to power up to 4,500 local homes. The central Brookhaven National Laboratory campus is seen at left. Liisa O'Neill Liisa O'Neill Former New Media Specialist, Office of Public Affairs What are the key facts? The 32-megawatt Long Island Solar Farm Project will produce enough

327

National Lab 'Flips Switch' on East Coast's Largest Solar Array |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Lab 'Flips Switch' on East Coast's Largest Solar Array Lab 'Flips Switch' on East Coast's Largest Solar Array National Lab 'Flips Switch' on East Coast's Largest Solar Array November 21, 2011 - 12:16pm Addthis An aerial view of the 32-megawatt photovoltaic array of the Long Island Solar Farm, which will produce enough energy to power up to 4,500 local homes. The central Brookhaven National Laboratory campus is seen at left. An aerial view of the 32-megawatt photovoltaic array of the Long Island Solar Farm, which will produce enough energy to power up to 4,500 local homes. The central Brookhaven National Laboratory campus is seen at left. Liisa O'Neill Liisa O'Neill Former New Media Specialist, Office of Public Affairs What are the key facts? The 32-megawatt Long Island Solar Farm Project will produce enough

328

III-V Nanowire Array Growth by Selective Area Epitaxy  

SciTech Connect

III-V semiconductor nanowires are unique material phase due to their high aspect ratio, large surface area, and strong quantum confinement. This affords the opportunity to control charge transport and optical properties for electrical and photonic applications. Nanoscale selective area metalorganic chemical vapor deposition growth (NS-SAG) is a promising technique to maximize control of nanowire diameter and position, which are essential for device application. In this work, InP and GaAs nanowire arrays are grown by NS-SAG. We observe enhanced sidewall growth and array uniformity disorder in high growth rate condition. Disorder in surface morphology and array uniformity of InP nanowire array is explained by enhanced growth on the sidewall and stacking faults. We also find that AsH{sub 3} decomposition on the sidewall affects the growth behavior of GaAs nanowire arrays.

Chu, Hyung-Joon; Stewart, Lawrence [Ming Hsieh Department of Electrical Engineering, University of Southern California (United States); Yeh, Tingwei [Mork Family Department of Chemical Engineering and Material Science, University of Southern California 3651 Watt Way, VHE-314, Los Angeles, CA90089 (United States); Dapkus, P. Daniel [Ming Hsieh Department of Electrical Engineering, University of Southern California (United States); Mork Family Department of Chemical Engineering and Material Science, University of Southern California 3651 Watt Way, VHE-314, Los Angeles, CA90089 (United States)

2011-12-23T23:59:59.000Z

329

PNP - a new class of coded aperture arrays  

SciTech Connect

The authors report on a new class of coded aperture arrays which has all the desirable imaging characteristics of the Uniformly Redundant Array (URA), yet is constructible in dimensions which are forbidden to that design. In addition, the new arrays (called PNP arrays, for Pseudo-Noise Product) are of self-supporting geometry, simplifying fabrication and making them ideal candidates for situations where active collimators are employed, as for example in high-energy ..gamma..-ray imaging. A unique and important feature of all PNP arrays is the ability to produce reconstructed images whose noise is uniform regardless of the original source structure. A comparison of the predicted performance of the PNP, URA, GEOMETRIC, and PINHOLE designs is presented. Coded aperture imaging, which utilizes position-sensitive detectors, was first proposed as a means for detecting x-ray and gamma sources.

Gottesman, S.R.; Schneid, E.J.

1986-02-01T23:59:59.000Z

330

Calculation of the transverse kicks generated by the bends of a hollow electron lens  

SciTech Connect

Electron lenses are pulsed, magnetically confined electron beams whose current-density profile is shaped to obtain the desired effect on the circulating beam in high-energy accelerators. They were used in the Fermilab Tevatron collider for abort-gap clearing, beam-beam compensation, and halo scraping. A beam-beam compensation scheme based upon electron lenses is currently being implemented in the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. This work is in support of a conceptual design of hollow electron beam scraper for the Large Hadron Collider. It also applies to the implementation of nonlinear integrable optics with electron lenses in the Integrable Optics Test Accelerator at Fermilab. We consider the axial asymmetries of the electron beam caused by the bends that are used to inject electrons into the interaction region and to extract them. A distribution of electron macroparticles is deposited on a discrete grid enclosed in a conducting pipe. The electrostatic potential and electric fields are calculated using numerical Poisson solvers. The kicks experienced by the circulating beam are estimated by integrating the electric fields over straight trajectories. These kicks are also provided in the form of interpolated analytical symplectic maps for numerical tracking simulations, which are needed to estimate the effects of the electron lens imperfections on proton lifetimes, emittance growth, and dynamic aperture. We outline a general procedure to calculate the magnitude of the transverse proton kicks, which can then be generalized, if needed, to include further refinements such as the space-charge evolution of the electron beam, magnetic fields generated by the electron current, and longitudinal proton dynamics.

Stancari, Giulio

2014-03-25T23:59:59.000Z

331

The Deep Lens Survey Transient Search I : Short Timescale and Astrometric Variability  

E-Print Network (OSTI)

We report on the methodology and first results from the Deep Lens Survey transient search. We utilize image subtraction on survey data to yield all sources of optical variability down to 24th magnitude. Images are analyzed immediately after acquisition, at the telescope and in near-real time, to allow for followup in the case of time-critical events. All classes of transients are posted to the web upon detection. Our observing strategy allows sensitivity to variability over several decades in timescale. The DLS is the first survey to classify and report all types of photometric and astrometric variability detected, including solar system objects, variable stars, supernovae, and short timescale phenomena. Three unusual optical transient events were detected, flaring on thousand-second timescales. All three events were seen in the B passband, suggesting blue color indices for the phenomena. One event (OT 20020115) is determined to be from a flaring Galactic dwarf star of spectral type dM4. From the remaining two events, we find an overall rate of \\eta = 1.4 events deg-2 day-1 on thousand-second timescales, with a 95% confidence limit of \\eta < 4.3. One of these events (OT 20010326) originated from a compact precursor in the field of galaxy cluster Abell 1836, and its nature is uncertain. For the second (OT 20030305) we find strong evidence for an extended extragalactic host. A dearth of such events in the R passband yields an upper 95% confidence limit on short timescale astronomical variability between 19.5 < R < 23.4 of \\eta_R < 5.2. We report also on our ensemble of astrometrically variable objects, as well as an example of photometric variability with an undetected precursor.

A. C. Becker; D. M. Wittman; P. C. Boeshaar; A. Clocchiatti; I. P. Dell'Antonio; D. A. Frail; J. Halpern; V. E. Margoniner; D. Norman; J. A. Tyson; R. A. Schommer

2004-04-21T23:59:59.000Z

332

The Long Wavelength Array (LWA): A Large HF/VHF Array for Solar Physics, Ionospheric Science, and Solar Radar  

E-Print Network (OSTI)

The Long Wavelength Array (LWA): A Large HF/VHF Array for Solar Physics, Ionospheric Science, and Solar Radar Namir E. Kassim Naval Research Laboratory, Washington, DC 20375 Stephen M. White AFRL will be a powerful tool for solar physics and space weather investigations, through its ability to characterize

Ellingson, Steven W.

333

E-Print Network 3.0 - array integrated read Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

and Information Sciences 8 Computation Visualization Summary: of mxArray to get from MATLAB. Description engGetArray reads the named mxArray from the MATLAB engine... Delete...

334

Arrays of 128x32 InP-based Geiger-mode avalanche photodiodes  

E-Print Network (OSTI)

Arrays of InP-based avalanche photodiodes operating at 1.06-µm wavelength in the Geiger mode have been fabricated in the 128x32 format. The arrays have been hermetically packaged with precision-aligned lenslet arrays, ...

Brattain, Michael A.

335

SiC APDs and arrays for UV and solar blind detection  

E-Print Network (OSTI)

We report advancements in APDs and arrays using 4H SiC. Novel structures, array designs and specialized read out integrated circuits have been developed towards the realization of UV and solar-blind detector arrays exhibiting ...

Shaw, Gary A.

336

Nanoscale array structures suitable for surface enhanced raman scattering and methods related thereto  

DOE Patents (OSTI)

Methods for fabricating nanoscale array structures suitable for surface enhanced Raman scattering, structures thus obtained, and methods to characterize the nanoscale array structures suitable for surface enhanced Raman scattering. Nanoscale array structures may comprise nanotrees, nanorecesses and tapered nanopillars.

Bond, Tiziana C.; Miles, Robin; Davidson, James C.; Liu, Gang Logan

2014-07-22T23:59:59.000Z

337

ATV SEMAPP AKADEMIET FOR DE TEKNISKE VIDENSKABER Nanoaktiviteter i Danmark  

E-Print Network (OSTI)

kvadraturkomposant .....og vi ønske også retningen bestemt! #12;Lens array, f1 f1 Lens, f2 f1+f2 f2 Detectors Input eye lens system: #12;@f1+f2 f2 Input plane x f1 Lens, f2 Detectors Output plane Input ray p Lens array, f1 Detectors Single lens in lens array, f1 x p Input ray Input ray #12;++ ++ -- -- In-phase signal

338

Continental seismic events observed by the MPL vertical DIFAR array  

SciTech Connect

The vertical DIFAR array, an underwater acoustic sensor system, deployed by the Marine Physical Laboratory (MPL) was in place over the continental shelf off of Southern California and recorded the HUNTERS TROPHY nuclear test and nearly a score of after-shocks of the Landers/Big Bear earthquakes. Data from this array raise the possibility that detection thresholds for continental events may be significantly lower for arrays over the continental shelf than for arrays in the deep ocean basins. Offshore stations could be used to fill gaps in land-based seismic networks for monitoring the NPT and a CTBT, especially for monitoring non-cooperating nations with large coastlines. This preliminary report provides an analysis of the HUNTERS TROPHY observation as well as one of the Landers aftershocks. The analysis suggests detection thresholds for vertical hydrophone arrays below mb 3.0 at ranges between 3 and 4 degrees, and below mb 4.4 out to 6 degrees. This report also describes two signal processing techniques that enhance the detection potential of short vertical arrays. These methods are deterministic null steering to suppress horizontally propagating ambient ocean noise, and matched field processing for vertically-incident acoustic fields. The latter technique is ideally suited for acoustic fields derived from incident seismic waves, and may be viewed as a {open_quotes}synthetic aperture{close_quotes} approach to increase the effective aperture of the array.

Harris, D.B. [Lawrence Livermore National Lab., CA (United States); D`Spain, G. [Scripps Institution of Oceanography, San Diego, CA (United States). Marine Physical Lab.

1993-11-01T23:59:59.000Z

339

Compensated individually addressable array technology for human breast imaging  

DOE Patents (OSTI)

A method of forming broad bandwidth acoustic or microwave beams which encompass array design, array excitation, source signal preprocessing, and received signal postprocessing. This technique uses several different methods to achieve improvement over conventional array systems. These methods are: 1) individually addressable array elements; 2) digital-to-analog converters for the source signals; 3) inverse filtering from source precompensation; and 4) spectral extrapolation to expand the bandwidth of the received signals. The components of the system will be used as follows: 1) The individually addressable array allows scanning around and over an object, such as a human breast, without any moving parts. The elements of the array are broad bandwidth elements and efficient radiators, as well as detectors. 2) Digital-to-analog converters as the source signal generators allow virtually any radiated field to be created in the half-space in front of the array. 3) Preprocessing allows for corrections in the system, most notably in the response of the individual elements and in the ability to increase contrast and resolution of signal propagating through the medium under investigation. 4) Postprocessing allows the received broad bandwidth signals to be expanded in a process similar to analytic continuation. Used together, the system allows for compensation to create beams of any desired shape, control the wave fields generated to correct for medium differences, and improve contract and resolution in and through the medium.

Lewis, D. Kent (San Francisco, CA)

2003-01-01T23:59:59.000Z

340

GAiN: Distributed Array Computation with Python  

SciTech Connect

Scientific computing makes use of very large, multidimensional numerical arrays - typically, gigabytes to terabytes in size - much larger than can fit on even the largest single compute node. Such arrays must be distributed across a "cluster" of nodes. Global Arrays is a cluster-based software system from Battelle Pacific Northwest National Laboratory that enables an efficient, portable, and parallel shared-memory programming interface to manipulate these arrays. Written in and for the C and FORTRAN programming languages, it takes advantage of high-performance cluster interconnections to allow any node in the cluster to access data on any other node very rapidly. The "numpy" module is the de facto standard for numerical calculation in the Python programming language, a language whose use is growing rapidly in the scientific and engineering communities. numpy provides a powerful N-dimensional array class as well as other scientific computing capabilities. However, like the majority of the core Python modules, numpy is inherently serial. Our system, GAiN (Global Arrays in NumPy), is a parallel extension to Python that accesses Global Arrays through numpy. This allows parallel processing and/or larger problem sizes to be harnessed almost transparently within new or existing numpy programs.

Daily, Jeffrey A.

2009-04-24T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

E-Print Network 3.0 - array structures utilizing Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

based on phased array technology. It can interrogate large structural areas... a mini phased array ... Source: Giurgiutiu, Victor - Department of Mechanical Engineering,...

342

E-Print Network 3.0 - array performance model Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

ON APPLIED SUPERCONDUCTIVITY, VOL. 16, NO. 4, DECEMBER 2006 2005 Arrays of SNS Josephson Junctions Summary: array and to optimize their performance for Josephson voltage...

343

Thermodynamic Signatures of Half-Quantum Vortices in p+ip Josephson Junction Arrays  

E-Print Network (OSTI)

bind a Majorana Fermion . . 3 Josephson Junction Arrays 3.14 p + ip Josephson Junction Arrays 4.1Bind a Majorana Fermion . . . . . . . . . Josephson Junction

Krahn, Graham Joel

2012-01-01T23:59:59.000Z

344

E-Print Network 3.0 - array growth kinetics Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

large-scale micropatterned arrays of ultralong ZnO nanowires and nanobelts... -optoelectronic devices and nanosensor arrays.5 For the controlled ... Source: Qi, Limin - College of...

345

Project Profile: High-Temperature Thermal Array for Next-Generation...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Thermal Array for Next-Generation Solar Thermal Power Production Project Profile: High-Temperature Thermal Array for Next-Generation Solar Thermal Power Production Los Alamos...

346

E-Print Network 3.0 - array beam controllers Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

for: array beam controllers Page: << < 1 2 3 4 5 > >> 1 Limited Diffraction Array Beams Ultrasound Research Laboratory, Department of Physiology and Biophysics, Mayo Clinic...

347

E-Print Network 3.0 - array fabrication method Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

analyte concentrations. We fabricated a non-close- packed sensing array... -containing hydro- gel-film-embedded 2-D array was ... Source: Asher, Sanford A. - Department of...

348

E-Print Network 3.0 - array project final Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

for sorting BASIC arrays. Any type of array (integer, singledouble precision... or string) may be sorted. Sorts can be performed on one and two dimensional ... Source: Mann,...

349

Interactions of solitary waves with cylinder arrays  

SciTech Connect

This paper addresses a numerical investigation of solitary waves interactions with an array of multiple surface-piercing vertical cylinders and the corresponding nonlinear hydrodynamic loads on each individual cylinder. The theoretical model adopted for simulation is the generalized Boussinesq two-equation model. The boundary-fitted coordinate transformation and multiple-grid technique are utilized here to simplify the computational domain and to facilitate the applications of the boundary conditions on the cylinder surfaces. The scattered wave field and the hydrodynamic forces on each cylinder during wave impact are numerically evaluated. Study of sheltering effect by the neighboring structures on wave loads is conducted. It is found that the presence of the neighboring cylinders has shown significantly influence on the wave loads and the scattering of the primary incident waves. For a tandem two cylinders, the shielding effect plays an important role to reduce the force acting on the rear cylinder. For transversely arranged two cylinders, the in-line force distribution is mostly independent of the gap distance between cylinders. However, the transverse force coefficient increases as the separation distance decreases.

Wang, K.H.; Jiang, L. [Univ. of Houston, TX (United States). Dept. of Civil and Environmental Engineering

1994-12-31T23:59:59.000Z

350

Parametric acoustic arrays: A Bergen view.  

Science Journals Connector (OSTI)

At the University of Bergen (UoB) Norway research activity in physical acoustics started in the mid?1960s with investigations on the parametric acoustic array (PAA). The newly appointed professor in applied mathematics Sigve Tjo/tta had some years earlier been at Brown University and was inspired by the concept at a fundamental level but also wanted experimental confirmation. No previous acoustical activity existed at UoB. The PAA project was started as a master project at Department of Physics where the main activity was in nuclear high?energy and ionospheric physics. Bellin and Beyer’s experiment served as a model. The results provided new information on the axial and directional properties of the difference frequency wave field. Inspired by this theoretical modeling continued along with further measurements. Other nonlinear effects like acoustic streaming (boundary layer density gradient) were also investigated. In 1975 a project together with SIMRAD and Norwegian Technical University resulted in a bottom penetrating PAA later commercialized as “TOPAS.” Numerical modeling based on the KZK equation resulted in the “Bergen Code ” still in use for computing nonlinear acoustic propagation problems. In later years activity at UoB has expanded to encompass linear physical acoustics of various sorts occasionally using PAA as a tool.

2009-01-01T23:59:59.000Z

351

DC Resistivity Survey (Dipole-Dipole Array) | Open Energy Information  

Open Energy Info (EERE)

DC Resistivity Survey (Dipole-Dipole Array) DC Resistivity Survey (Dipole-Dipole Array) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: DC Resistivity Survey (Dipole-Dipole Array) Details Activities (1) Areas (1) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Electrical Techniques Parent Exploration Technique: Electrical Profiling Configurations Information Provided by Technique Lithology: Rock composition, mineral and clay content Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water Thermal: Resistivity influenced by temperature

352

DC Resistivity Survey (Wenner Array) | Open Energy Information  

Open Energy Info (EERE)

Wenner Array) Wenner Array) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: DC Resistivity Survey (Wenner Array) Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Electrical Techniques Parent Exploration Technique: Vertical Electrical Sounding Configurations Information Provided by Technique Lithology: Rock composition, mineral and clay content Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water Thermal: Resistivity influenced by temperature Dictionary.png

353

DC Resistivity Survey (Pole-Dipole Array) | Open Energy Information  

Open Energy Info (EERE)

Pole-Dipole Array) Pole-Dipole Array) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: DC Resistivity Survey (Pole-Dipole Array) Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Electrical Techniques Parent Exploration Technique: Electrical Profiling Configurations Information Provided by Technique Lithology: Rock composition, mineral and clay content Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water Thermal: Resistivity influenced by temperature Dictionary.png

354

DC Resistivity Survey (Schlumberger Array) | Open Energy Information  

Open Energy Info (EERE)

Schlumberger Array) Schlumberger Array) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: DC Resistivity Survey (Schlumberger Array) Details Activities (2) Areas (2) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Electrical Techniques Parent Exploration Technique: Vertical Electrical Sounding Configurations Information Provided by Technique Lithology: Rock composition, mineral and clay content Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water Thermal: Resistivity influenced by temperature

355

Flow and heat transfer around a linear array of spheres  

SciTech Connect

Laminar fluid flow and forced convection heat transfer over equally space linear arrays of spheres are analyzed using the finite element package FIDAP. For the arrays, sphere spacings of 1.5, 2, and 3 diameters are examined at Reynolds numbers of 40, 80, and 120 and Prandtl numbers ranging from 0.73 to 7.3. Average Nusselt numbers and drag coefficient data for a linear array of eight spheres (as an approximation to the developing region) and a single sphere with periodic boundary conditions (as an approximation to fully developed flow) are presented and correlated.

Lloyd, B. (Marathon Oil Co., Shreveport, LA (United States)); Boehn, R. (Univ. of Nevada, Las Vegas, NV (United States). Mechanical Engineering Dept.)

1994-08-01T23:59:59.000Z

356

Theory of Optical Bloch Oscillations in the Zigzag Waveguide Array  

E-Print Network (OSTI)

The Bloch oscillations in the zigzag array of the optical waveguides are considered. The multiple scattering formalism (MSF) is used for the numerical simulation of the optical beam which propagates within the array. The effect of the second-order coupling which depends on the geometrical parameters of the array is investigated. The results obtained within the MSF are compared with the calculation based on the phenomenological coupling modes model. The calculations are performed for the waveguides fabricated in alkaline earth boro-aluminosilicate glass sample, which are the most promising for the C-band (1530-1565 nm).

Babichenko, V S; Kagan, Yu M; Polishchuk, I Ya; Tsyvkunova, E A

2015-01-01T23:59:59.000Z

357

Nanowire array photovoltaics: Radial disorder versus design for optimal efficiency  

E-Print Network (OSTI)

Solar cell designs based on disordered nanostructures tend to have higher efficiencies than structures with uniform absorbers, though the reason is poorly understood. To resolve this, we use a semi-analytic approach to determine the physical mechanism leading to enhanced efficiency in arrays containing nanowires with a variety of radii. We use our findings to systematically design arrays that outperform randomly composed structures. An ultimate efficiency of 23.75% is achieved with an array containing 30% silicon, an increase of almost 10% over a homogeneous film of equal thickness.

Sturmberg, Björn C P; Botten, Lindsay C; Asatryan, Ara A; Poulton, Christopher G; McPhedran, Ross C; de Sterke, C Martijn

2014-01-01T23:59:59.000Z

358

On the relationship between whole body, extremity and eye lens doses for medical staff in the preparation and application of radiopharmaceuticals in nuclear medicine  

Science Journals Connector (OSTI)

We performed individual dose measurements, in terms of Hp(10) for the whole body, Hp(0,07) for the extremities (hands) and Hp(3) for the eyes, for medical personnel (technical staff, nurses and medical doctors) in three nuclear medicine departments. One conventional diagnostic scintigraphy department, where Tc-99m, I-131 and Sm-153 were applied, and two PET-CT departments where F-18 was applied in preparation and application procedures, were studied. A novel eye lens dosemeter was used, designed to evaluate Hp(3) directly. From our measurements we obtained ratios of Hp(3)/Hp(10) ranging between 0.7 and 1.1 indicating that in nuclear medicine procedures eye lens doses could probably be estimated from Hp(10) values and that exceeding the present annual dose limit to eye lens (150 mSv) is very unlikely. The relationship between different individual doses can indicate the quality of radiation protection in a nuclear medicine department.

R. Kopec; M. Budzanowski; A. Budzy?ska; R. Czepczynski; M. Dziuk; J. Sowinski; A. Wyszomirska

2011-01-01T23:59:59.000Z

359

Design, assembly, and testing of a high-resolution relay lens used for holography with operation at both doubled and tripled Nd:YAG laser wavelengths  

SciTech Connect

The design and assembly of a nine-element lens that achieves >2000 1p/mm resolution at a 355-nm wavelength (ultraviolet) has been completed. By adding a doublet to this lens system, operation at a 532-nm wavelength (green) with > 1100 1p/mm resolution is achieved. This lens is used with high-power laser light to record holograms of fast-moving ejecta particles from a shocked metal surface located inside a test package. Part of the lens and the entire test package are under vacuum with a 1-cm air gap separation. Holograms have been recorded with both doubled and tripled Nd:YAG laser light. The UV operation is very sensitive to the package window's tilt. If this window is tilted by more than 0.1 degrees, the green operation performs with better resolution than that of the UV operation. The setup and alignment are performed with green light, but the dynamic recording can be done with either UV light or green light. A resolution plate can be temporarily placed inside the test package so that a television microscope located beyond the hologram position can archive images of resolution patterns that prove that the calibration wires., interference filter, holographic plate, and relay lenses are in their correct positions. Part of this lens is under vacuum, at the point where the laser illumination passes through a focus. Alignment and tolerancing of this high-resolution lens are presented. Resolution variation across the 12-mm field of view and throughout the 5-mm depth of field is discussed for both wavelengths.

Sorenson, Danny S [Los Alamos National Laboratory; Pazuchanics, Peter D [Los Alamos National Laboratory; Malone, Robert M [NSTEC; Cox, Brian C [NSTEC; Frogget, Brent C [NSTEC; Kaufman, Morris I [NSTEC; Capelle, Gene A [NSTEC/SB; Grover, M [NSTEC/SB; Stevens, Gerald D [NSTEC/SB; Turley, William D [NSTEC/SB

2009-01-01T23:59:59.000Z

360

A Non-linear Reaction-Diffusion System in Propagating Diffusive Wave in Nitroguanidine (NQ) Lens Using Ising-Bloch Bifurcation  

E-Print Network (OSTI)

A wave front propagating through a medium is described using the Ising--Bloch method The reaction-diffusion behaviour of an autocatalysis model of incoming waves from energetic material in a nitroguanidine lens and its interactions with Dirichlet boundaries system are examined. Wave splitting is found to occur for some relative diffusivities through introducing defects into the lens. The system is introduced using a nonlinear method with a Boltzmann--Gibbs distribution of diffusion parameters and forced into a right-hand-side divergence for final analysis. Considering the nonlinearity, the model is expanded by introducing the decomposition kinetics into the set of equations developed.

Mirfayzi, S R

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

The Neutron Energy Spectrum Study from the Phase II Solid Methane Moderator at the LENS Neutron Source  

E-Print Network (OSTI)

Neutron energy spectrum measurements from a solid methane moderator were performed at the Low Energy Neutron Source (LENS) at Indiana University Cyclotron Facility (IUCF) to verify our neutron scattering model of solid methane. The time-of-flight method was used to measure the energy spectrum of the moderator in the energy range of 0.1$meV\\sim$ 1$eV$. Neutrons were counted with a high efficiency $^{3}{He}$ detector. The solid methane moderator was operated in phase II temperature and the energy spectra were measured at the temperatures of 20K and 4K. We have also tested our newly-developed scattering kernels for phase II solid methane by calculating the neutron spectral intensity expected from the methane moderator at the LENS neutron source using MCNP (Monte Carlo N-particle Transport Code). Within the expected accuracy of our approximate approach, our model predicts both the neutron spectral intensity and the optimal thickness of the moderator at both temperatures. The predictions are compared to the measured energy spectra. The simulations agree with the measurement data at both temperatures.

Yunchang Shin; W. Mike Snow; Christopher M. Lavelle; David V. Baxter; Xin Tong; Haiyang Yan; Mark Leuschner

2007-11-19T23:59:59.000Z

362

Surface aspects of discolouration in Bisphenol A Polycarbonate (BPA-PC), used as lens in LED-based products  

Science Journals Connector (OSTI)

Abstract The surface-related reactions during discolouration of Bisphenol A Polycarbonate (BPA-PC), used as LED lens plates, under thermal stress are studied. X-ray photoelectron spectroscopy (XPS) has been used to monitor the changes in the surface chemistry of BPA-PC plates over a temperature range of 100–140 °C for a period up to 3000 h. Increasing time under thermal stress is associated with the discolouration, and increase in the yellowing index (YI) of PC plastic lens. The XPS results show that discolouration is associated with oxidation at the surface, finding a significant increase in the signal ratio O1s/C1s in the XPS spectra of degraded specimens. During thermal ageing, the CH concentration decreases and new oxide features CO and OCO form, with the latter being a support for oxidation at the surface being a major reaction during discolouration. Results also show that irradiation with blue light during thermal ageing accelerates the kinetics of discolouration and the increased O1s/C1s ratio in XPS spectra.

M. Yazdan Mehr; W.D. van Driel; H. Udono; G.Q. Zhang

2014-01-01T23:59:59.000Z

363

Initial Results of Magnetotelluric Array Surveying at the Dixie Valley  

Open Energy Info (EERE)

Initial Results of Magnetotelluric Array Surveying at the Dixie Valley Initial Results of Magnetotelluric Array Surveying at the Dixie Valley Geothermal Area, with Implications for Structural Controls and Hydrothermal Alteration Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Initial Results of Magnetotelluric Array Surveying at the Dixie Valley Geothermal Area, with Implications for Structural Controls and Hydrothermal Alteration Abstract A new generation MT array measurement system was applied in a contiguous bipole deployment at the Dixie Valley thermal area. Basic goals of the survey area are 1), resolve a fundamental structural ambiguity at the Dixie Valley thermal area (single range front fault versus shallower, stepped pediment; 2) delineate fault zones which have experienced fluid flux as

364

Tornado Warning Decisions Using Phased Array Radar Data  

Science Journals Connector (OSTI)

The 2012 Phased Array Radar Innovative Sensing Experiment identified how rapidly scanned full-volumetric data captured known mesoscale processes and impacted tornado-warning lead time. Twelve forecasters from nine National Weather Service forecast ...

Pamela Heinselman; Daphne LaDue; Darrel M. Kingfield; Robert Hoffman

365

On the configuration of arrays of floating wave energy converters   

E-Print Network (OSTI)

In this thesis, certain issues relating to a number of wave energy absorbers operating in the same vicinity are investigated. Specifically, arrangements of the devices within such an array are sought, such that beneficial ...

Child, Benjamin Frederick Martin

2011-11-22T23:59:59.000Z

366

Circular sensor array and nonlinear analysis of homopolar magnetic bearings  

E-Print Network (OSTI)

an adjustment factor for single failures. A prototype 8-sensor array shows substantial runout reduction and bandwidth and sensitivity comparable to commercial systems. Nonlinear behavior in homopolar magnetic bearings is caused primarily by the quadratic...

Wiesenborn, Robert Kyle

2007-04-25T23:59:59.000Z

367

Differential-ground-motion array at Hollister Municipal Airport, California  

SciTech Connect

This report describes the differential array of seismometers recently installed at the Hollister, California, Municipal Airport. Such an array of relatively closely spaced seismometers has already been installed in El Centro and provided useful information for both engineering and seismological applications from the 1979 Imperial Valley earthquake. Differential ground motions, principally due to horizontally propagating surface waves, are important in determining the stresses in such extended structures as large mat foundations for nuclear power stations, dams, bridges and pipelines. Further, analyses of the records of the 1979 Imperial Valley earthquake from the differential array have demonstrated the utility of short-baseline array data in tracking the progress of the rupture wave front of an earthquake. 5 refs., 4 figs.

Bycroft, G.N.

1983-01-01T23:59:59.000Z

368

Cell-based array for deep sub-micron technologies  

E-Print Network (OSTI)

In this thesis I explore transistor topologies for high density cell-based arrays that allows for dense computation blocks, small memory cells, and strong signal drivers. This involves simulating different circuit types ...

Oey, James Boe-Kian, 1980-

2003-01-01T23:59:59.000Z

369

Modeling Disk Arrays Using Genetic Programming Evan Kirshenbaum  

E-Print Network (OSTI)

Page Mill Road Palo Alto, CA 94304 kirshenbaum@hpl.hp.com Abstract This paper describes the results to population size but not run length. 1 BACKGROUND In the past decade, enterprises have turned to disk arrays

Fernandez, Thomas

370

MATLAB array manipulation tips and tricks Peter J. Acklam  

E-Print Network (OSTI)

MATLAB array manipulation tips and tricks Peter J. Acklam E-mail: pjacklam@online.no URL: http in this document may be reproduced or duplicated for personal or educational use. MATLAB is a trademark of The Math

371

Potential technologies based on stamped periodic nanoparticle array  

E-Print Network (OSTI)

A stamped nanoparticle array patterning technology integrating interference lithography, self assembly and soft lithography is assessed. This technology is capable of parallel patterning of nanoparticles at a large scale. ...

Wang, Zongbin

2009-01-01T23:59:59.000Z

372

The EoR sensitivity of the Murchison Widefield Array  

E-Print Network (OSTI)

Using the final 128 antenna locations of the Murchison Widefield Array (MWA), we calculate its sensitivity to the epoch of reionization (EoR) power spectrum of redshifted 21 cm emission for a fiducial model and provide the ...

Cappallo, Roger J.

373

Doped graphene nanohole arrays for flexible transparent conductors  

E-Print Network (OSTI)

Graphene nanohole arrays (GNAs) were fabricated using nanoimprint lithography. The improved optical transmittance of GNAs is primarily due to the reduced surface coverage of graphene from the nanohole fabrication. Importantly, the exposed edges...

Liu, Jianwei; Xu, Guowei; Rochford, Caitlin; Lu, Rongtao; Wu, Judy; Edwards, Christina M.; Berrie, Cindy L.; Chen, Zhijun; Maroni, Victor A.

2011-07-15T23:59:59.000Z

374

High-Temperature Thermal Array for Next Generation Solar Thermal...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

3 Q1 High-Temperature Thermal Array for Next Generation Solar Thermal Power Production - FY13 Q1 This document summarizes the progress of this Los Alamos National Laboratory...

375

Design and optimization of a defect tolerant processor array  

E-Print Network (OSTI)

In this thesis we design and optimization of a defect tolerant MIMD processor array, for maximum performance per wafer area, targeted at applications that have a large number of operations per memory word, is described. The optimization includes...

Lakkapragada, Bhavani S

2012-06-07T23:59:59.000Z

376

DC Resistivity Survey (Schlumberger Array) At Coso Geothermal Area (1977) |  

Open Energy Info (EERE)

DC Resistivity Survey (Schlumberger Array) At Coso DC Resistivity Survey (Schlumberger Array) At Coso Geothermal Area (1977) Exploration Activity Details Location Coso Geothermal Area Exploration Technique DC Resistivity Survey (Schlumberger Array) Activity Date 1977 Usefulness not indicated DOE-funding Unknown Exploration Basis To investigate electrical properties of rocks associated with thermal phenomena of the Devil's Kitchen-Coso Hot Springs area Notes 18 USGS Schlumberger soundings and 6 Schlumberger soundings by Furgerson (1973) were plotted and automatically processed and interpreted References Jackson, D.B. ODonnell, J.E.; Gregory, D. I. (1 January 1977) Schlumberger soundings, audio-magnetotelluric soundings and telluric mapping in and around the Coso Range, California Retrieved from "http://en.openei.org/w/index.php?title=DC_Resistivity_Survey_(Schlumberger_Array)_At_Coso_Geothermal_Area_(1977)&oldid=591389

377

Electret Acoustic Transducer Array For Computerized Ultrasound Risk Evaluation System  

DOE Patents (OSTI)

An electret-based acoustic transducer array is provided and may be used in a system for examining tissue. The acoustic transducer array is formed with a substrate that has a multiple distinct cells formed therein. Within each of the distinct cells is positioned an acoustic transducing element formed of an electret material. A conductive membrane is formed over the distinct cells and may be flexible.

Moore, Thomas L. (Livermore, CA); Fisher, Karl A. (Brentwood, CA)

2005-08-09T23:59:59.000Z

378

DETECTION OF FAST TRANSIENTS WITH RADIO INTERFEROMETRIC ARRAYS  

SciTech Connect

Next-generation radio arrays, including the Square Kilometre Array (SKA) and its pathfinders, will open up new avenues for exciting transient science at radio wavelengths. Their innovative designs, comprising a large number of small elements, pose several challenges in digital processing and optimal observing strategies. The Giant Metre-wave Radio Telescope (GMRT) presents an excellent test-bed for developing and validating suitable observing modes and strategies for transient experiments with future arrays. Here we describe the first phase of the ongoing development of a transient detection system for GMRT that is planned to eventually function in a commensal mode with other observing programs. It capitalizes on the GMRT's interferometric and sub-array capabilities, and the versatility of a new software backend. We outline considerations in the plan and design of transient exploration programs with interferometric arrays, and describe a pilot survey that was undertaken to aid in the development of algorithms and associated analysis software. This survey was conducted at 325 and 610 MHz, and covered 360 deg{sup 2} of the sky with short dwell times. It provides large volumes of real data that can be used to test the efficacies of various algorithms and observing strategies applicable for transient detection. We present examples that illustrate the methodologies of detecting short-duration transients, including the use of sub-arrays for higher resilience to spurious events of terrestrial origin, localization of candidate events via imaging, and the use of a phased array for improved signal detection and confirmation. In addition to demonstrating applications of interferometric arrays for fast transient exploration, our efforts mark important steps in the roadmap toward SKA-era science.

Bhat, N. D. R. [International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102 (Australia)] [International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102 (Australia); Chengalur, J. N.; Gupta, Y.; Prasad, J.; Roy, J.; Kudale, S. S. [National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune 411007 (India)] [National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune 411007 (India); Cox, P. J.; Bailes, M.; Burke-Spolaor, S.; Van Straten, W. [Centre for Astrophysics and Supercomputing, Swinburne University, Hawthorn, Victoria 3122 (Australia)] [Centre for Astrophysics and Supercomputing, Swinburne University, Hawthorn, Victoria 3122 (Australia)

2013-05-01T23:59:59.000Z

379

Dielectrophoresis device and method having nonuniform arrays for manipulating particles  

DOE Patents (OSTI)

Microfluidic devices according to embodiments of the present invention include an inlet port, an outlet port, and a channel or chamber having a non-uniform array of insulating features on one or more surfaces. Electrodes are provided for generation of a spatially non-uniform electric field across the array. A voltage source, which may be an A.C. and/or a D.C. voltage source may be coupled to the electrodes for the generation of the electric field.

Cummings, Eric B.; Fintschenko, Yolanda; Simmons, Blake A.

2012-09-04T23:59:59.000Z

380

Optical manipulation of intrinsic localized vibrational energy in cantilever arrays  

E-Print Network (OSTI)

Optically-induced real-time impurity modes are used to shepherd intrinsic localized vibrational modes (discrete breathers) along micromechanical arrays via either attractive or replulsive interactions. Adding an electrode to the cantilever array provides control of the sign of lattice anharmonicity, hence allowing both hard and soft nonlinearities to be studied. A number of dynamical effects are demonstrated and explained, including the optical tweezing of localized vibrational energy in a nonlinear lattice.

M. Sato; B. E. Hubbard; A. J. Sievers; B. Ilic; H. G. Craighead

2004-03-16T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

CMOS ROM arrays programmable by laser beam scanning  

E-Print Network (OSTI)

CMOS ROM ARRAYS PROGRAMMABLE BY LASER BEAM SCANNING A Thesis bY JONG JUNE LEE Submitted to the Graduate College of Texas ASM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE May 1984 Major Subject... : Electrical Engineering CMOS ROM ARRAYS PROGRAMMABLE BY LASER BEAM SCANNING A Thesis by JONGJUNE LEE Approved as to style and content by: Noel R. Strader II (Chairman of Committee) Philli E. Allen (Member) Philip S. Noe (Member) Daniel Colunga...

Lee, Jongjune

2012-06-07T23:59:59.000Z

382

Experimental investigation of the ribbon-array ablation process  

SciTech Connect

Ablation processes of ribbon-array loads, as well as wire-array loads for comparison, were investigated on Qiangguang-1 accelerator. The ultraviolet framing images indicate that the ribbon-array loads have stable passages of currents, which produce axially uniform ablated plasma. The end-on x-ray framing camera observed the azimuthally modulated distribution of the early ablated ribbon-array plasma and the shrink process of the x-ray radiation region. Magnetic probes measured the total and precursor currents of ribbon-array and wire-array loads, and there exists no evident difference between the precursor currents of the two types of loads. The proportion of the precursor current to the total current is 15% to 20%, and the start time of the precursor current is about 25 ns later than that of the total current. The melting time of the load material is about 16 ns, when the inward drift velocity of the ablated plasma is taken to be 1.5 Multiplication-Sign 10{sup 7} cm/s.

Li Zhenghong; Xu Rongkun; Chu Yanyun; Yang Jianlun; Xu Zeping; Ye Fan; Chen Faxin; Xue Feibiao; Ning Jiamin; Qin Yi; Meng Shijian; Hu Qingyuan; Si Fenni; Feng Jinghua; Zhang Faqiang; Chen Jinchuan; Li Linbo; Chen Dingyang [Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900 (China); Ding Ning [Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China); Zhou Xiuwen [Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900 (China)

2013-03-15T23:59:59.000Z

383

High-frequency wave sources using Josephson-junction arrays  

SciTech Connect

Results from Josephson-junction arrays used as high-frequency wave sources are presented. Phase-locked Josephson-junction arrays having a large number of junctions were developed to meet the need for compact submillimeter-wave sources for use in such applications as satellite communications are receivers for radioastronomical observations. The design, fabrication processes, and measurement are discussed. Distributed arrays of 40 junctions in which all Josephson junctions are placed at wavelength intervals were fabricated and tested. Such arrays can deliver about 1 [mu]W of power into a 20-60 [Omega] load resistor in the frequency ranger from 100 to 500 GHz, the upper limit being set by the large loss of the superconducting microstrip. Compact arrays were designed and fabricated to eliminate the loss of the superconducting microstrip. Those arrays have also demonstrated an output power level about 1 [mu]W into a 15 [Omega] load from 100 GHz up to 620 GHz. Characteristics of the Josephson junction source, including the power level, impedance matching, the tunability, the radiation linewidth, and tuning rate (or frequency-modulation) are discussed.

Wan, Kelin.

1991-01-01T23:59:59.000Z

384

Interference effects in isolated Josephson junction arrays with geometric symmetries  

E-Print Network (OSTI)

As the size of a Josephson junction is reduced, charging effects become important and the superconducting phase across the link turns into a periodic quantum variable. Isolated Josephson junction arrays are described in terms of such periodic quantum variables and thus exhibit pronounced quantum interference effects arising from paths with different winding numbers (Aharonov-Casher effects). These interference effects have strong implications for the excitation spectrum of the array which are relevant in applications of superconducting junction arrays for quantum computing. The interference effects are most pronounced in arrays composed of identical junctions and possessing geometric symmetries; they may be controlled by either external gate potentials or by adding/removing charge to/from the array. Here we consider a loop of N identical junctions encircling one half superconducting quantum of magnetic flux. In this system, the ground state is found to be non-degenerate if the total number of Cooper pairs on the array is divisible by N, and doubly degenerate otherwise (after the stray charges are compensated by the gate voltages).

D. A. Ivanov; L. B. Ioffe; V. B. Geshkenbein; G. Blatter

2001-02-13T23:59:59.000Z

385

Arrayed resonant subwavelength gratings : LDRD 38618 final report.  

SciTech Connect

This report describes a passive, optical component called resonant subwavelength gratings (RSGs), which can be employed as one element in an RSG array. An RSG functions as an extremely narrow wavelength and angular band reflector, or mode selector. Theoretical studies predict that the infinite, laterally-extended RSG can reflect 100% of the resonant light while transmitting the balance of the other wavelengths. Experimental realization of these remarkable predictions has been impacted primarily by fabrication challenges. Even so, we will present large area (1.0mm) RSG reflectivity as high as 100.2%, normalized to deposited gold. Broad use of the RSG will only truly occur in an accessible micro-optical system. This program at Sandia is a normal incidence array configuration of RSGs where each array element resonates with a distinct wavelength to act as a dense array of wavelength- and mode-selective reflectors. Because of the array configuration, RSGs can be matched to an array of pixels, detectors, or chemical/biological cells for integrated optical sensing. Micro-optical system considerations impact the ideal, large area RSG performance by requiring finite extent devices and robust materials for the appropriate wavelength. Theoretical predictions and experimental measurements are presented that demonstrate the component response as a function of decreasing RSG aperture dimension and off-normal input angular incidence.

Grotbeck, Carter L.; Kemme, Shanalyn A.; Wendt, Joel Robert; Warren, Mial E.; Samora, Sally; Carter, Tony Ray; Hadley, G. Ronald; Peters, David William

2003-11-01T23:59:59.000Z

386

A functional gene array for detection of bacterial virulence elements  

SciTech Connect

We report our development of the first of a series of microarrays designed to detect pathogens with known mechanisms of virulence and antibiotic resistance. By targeting virulence gene families as well as genes unique to specific biothreat agents, these arrays will provide important data about the pathogenic potential and drug resistance profiles of unknown organisms in environmental samples. To validate our approach, we developed a first generation array targeting genes from Escherichia coli strains K12 and CFT073, Enterococcus faecalis and Staphylococcus aureus. We determined optimal probe design parameters for microorganism detection and discrimination, measured the required target concentration, and assessed tolerance for mismatches between probe and target sequences. Mismatch tolerance is a priority for this application, due to DNA sequence variability among members of gene families. Arrays were created using the NimbleGen Maskless Array Synthesizer at Lawrence Livermore National Laboratory. Purified genomic DNA from combinations of one or more of the four target organisms, pure cultures of four related organisms, and environmental aerosol samples with spiked-in genomic DNA were hybridized to the arrays. Based on the success of this prototype, we plan to design further arrays in this series, with the goal of detecting all known virulence and antibiotic resistance gene families in a greatly expanded set of organisms.

Jaing, C

2007-11-01T23:59:59.000Z

387

Combining rails and anchors with laser forcing for selective manipulation within 2D droplet arrays  

E-Print Network (OSTI)

-dimensional (2D)array format is a standard approachfor implementing a large number of parallel assays arrays of droplets in microchannels has proved more challenging, in part due to the standard methods and operating protocols, leading to different methods to array drops: quasi-2D arrays were formed by winding

Boyer, Edmond

388

Reproducible, high performance patch antenna array apparatus and method of fabrication  

SciTech Connect

A reproducible, high-performance patch antenna array apparatus includes a patch antenna array provided on a unitary dielectric substrate, and a feed network provided on the same unitary substrate and proximity coupled to the patch antenna array. The reproducibility is enhanced by using photolithographic patterning and etching to produce both the patch antenna array and the feed network.

Strassner, II, Bernd H. (Albuquerque, NM)

2007-01-23T23:59:59.000Z

389

Single-element optical injection locking of diode-laser arrays  

DOE Patents (OSTI)

By optically injecting a single end-element of a semiconductor laser array, both the spatial and spectral emission characteristics of the entire laser array is controlled. With the output of the array locked, the far-field emission angle of the array is continuously scanned over several degrees by varying the injection frequency.

Hadley, G. Ronald (Albuquerque, NM); Hohimer, John P. (Albuquerque, NM); Owyoung, Adelbert (Albuquerque, NM)

1988-01-01T23:59:59.000Z

390

Efficient Algorithms for Parallel Excitation and Parallel Imaging with Large Arrays  

E-Print Network (OSTI)

1.3 32 channel lattice transmission line array [1] . . . . . . . . . . . . . . 3 1.4 The 64 channel tranceive array built in MRSL, TAMU . . . . . . . . 3 2.1 Larmor frequency and signal formation . . . . . . . . . . . . . . . . . 7 2.2 Constant... array also increase the degree of freedom of parallel excita- tion pulse design and provides improved performance. Transmit array examples are shown in Fig. 1.3 and Fig. 1.4. Figure 1.3: 32 channel lattice transmission line array [1] Figure 1...

Feng, Shuo

2013-08-12T23:59:59.000Z

391

Optimized Volumetric Scanning for X-Ray Array Sources  

SciTech Connect

Non-destructive evaluation (NDE) is the science and technology of determining non-invasively the internal structure of manufactured parts, objects, and materials. NDE application areas include medicine, industrial manufacturing, military, homeland security, and airport luggage screening. X-ray measurement systems are most widely used because of their ability to image through a wide range of material densities (from human tissue in medical applications to the dense materials of weapon components). Traditional x-ray systems involve a single source and detector system that rotate and/or translate about the object under evaluation. At each angular location, the source projects x-rays through the object. The rays undergo attenuation proportional to the density of the object's constitutive material. The detector records a measure of the attenuation. Mathematical algorithms are used to invert the forward attenuated ray projection process to form images of the object. This is known as computed tomography (CT). In recent years, the single-source x-ray NDE systems have been generalized to arrays of x-ray sources. Array sources permit multiple views of the object with fewer rotations and translations of the source/detector system. The spatially diverse nature of x-ray array sources has the potential of reducing data collection time, reducing imaging artifacts, and increasing the resolution of the resultant images. Most of the existing CT algorithms were not derived from array source models with a spatially diverse set of viewing perspectives. Single-source x-ray CT data collection, processing, and imaging methods and algorithms are not applicable when the source location is expanded from one dimension (a rotating and/or translating point source) to two (a rotating and/or translating array). They must be reformulated. The goal of this project is to determine the applicability of x-ray array sources to problems of interest to LLNL and its customers. It is believed array source data collection will be faster while yielding higher resolution reconstructions with fewer artifacts. There are three tasks in the research: (1) Develop forward array source analytic and computational models; (2) Research and develop array source reconstruction algorithms; and (3) Perform experiments.

Lehman, S K; Foudray, A M; Wang, A; Kallman, J S; Martz, H

2009-09-29T23:59:59.000Z

392

Thermal lens study of thermo-optical properties and concentration quenching of Er3+-doped lead pyrophosphate based glasses  

SciTech Connect

In this work, we have used the thermal lens technique combined with conventional spectroscopy to characterize the thermo-optical properties of Er3+-doped lead pyrophosphate-based glasses. More precisely, we have investigated and quantified experimentally the fluorescence quantum efficiencies of the Er3+ levels, and we describe the role of concentration quenching effects. The fluorescence quantum efficiency of the 4I13/2 level is very high when compared to other phosphate glasses, while that of the green-coupled levels is very small. Other important photonic materials parameters, such as the thermal diffusivity and temperature coefficient of the optical path length change, were obtained and compared with those of other glass systems. The cumulative results obtained here for the Er-doped lead pyrophosphate glass show that this material is a good candidate for photonic applications with a characteristic Er3+ infrared emission around 1550 nm.

Santos, C. C. [Universidade Federal do Ceara, Ceara, Brazil; Rocha, U. [Grupo de Fotônica e Fluidos Complexos, Instituto de Física, Brazil; Guedes, Ilde [Universidade Federal do Ceara, Ceara, Brazil; Vermelho, M. V. D. [Instituto de Fisica, Universidade Federal de Alagoas, Brazil; Boatner, Lynn A [ORNL; Jacinto, C. [Instituto de Fisica, Universidade Federal de Alagoas, Brazil

2012-01-01T23:59:59.000Z

393

Phosphor-free nanopyramid white light-emitting diodes grown on (101{sup ¯}1) planes using nanospherical-lens photolithography  

SciTech Connect

We reported a high-efficiency and low-cost nano-pattern method, the nanospherical-lens photolithography technique, to fabricate a SiO{sub 2} mask for selective area growth. By controlling the selective growth, we got a highly ordered hexagonal nanopyramid light emitting diodes with InGaN/GaN quantum wells grown on nanofacets, demonstrating an electrically driven phosphor-free white light emission. We found that both the quantum well width and indium incorporation increased linearly along the (101{sup ¯}1) planes towards the substrate and the perpendicular direction to the (101{sup ¯}1) planes as well. Such spatial distribution was responsible for the broadband emission. Moreover, using cathodoluminescence techniques, it was found that the blue emission originated from nanopyramid top, resembling the quantum dots, green emission from the InGaN quantum wells layer at the middle of sidewalls, and yellow emission mainly from the bottom of nanopyramid ridges, similar to the quantum wires.

Wu, Kui [State Key Laboratory of Solid-State Lighting, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 (China) [State Key Laboratory of Solid-State Lighting, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 (China); Department of Electronic Engineering, Tsinghua National Laboratory for Information Science and Technology/State Key Lab on Integrated Optoelectronics, Tsinghua University, Beijing 100084 (China); Wei, Tongbo, E-mail: tbwei@semi.ac.cn; Wei, Xuecheng; Zheng, Haiyang; Chen, Yu; Lu, Hongxi; Wang, Junxi; Li, Jinmin [State Key Laboratory of Solid-State Lighting, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 (China)] [State Key Laboratory of Solid-State Lighting, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 (China); Lan, Ding [National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080 (China)] [National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080 (China); Huang, Kai [Platform of Characterization and Test, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215000 (China)] [Platform of Characterization and Test, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215000 (China); Luo, Yi [Department of Electronic Engineering, Tsinghua National Laboratory for Information Science and Technology/State Key Lab on Integrated Optoelectronics, Tsinghua University, Beijing 100084 (China)] [Department of Electronic Engineering, Tsinghua National Laboratory for Information Science and Technology/State Key Lab on Integrated Optoelectronics, Tsinghua University, Beijing 100084 (China)

2013-12-09T23:59:59.000Z

394

The Sloan Digital Sky Survey Quasar Lens Search. VI. Constraints on Dark Energy and the Evolution of Massive Galaxies  

Science Journals Connector (OSTI)

We present a statistical analysis of the final lens sample from the Sloan Digital Sky Survey Quasar Lens Search (SQLS). The number distribution of a complete subsample of 19 lensed quasars selected from 50,836 source quasars is compared with theoretical expectations, with particular attention given to the selection function. Assuming that the velocity function of galaxies does not evolve with redshift, the SQLS sample constrains the cosmological constant to ?? = 0.79+0.06 –0.07(stat.)+0.06 –0.06(syst.) for a flat universe. The dark energy equation of state is found to be consistent with w = –1 when the SQLS is combined with constraints from baryon acoustic oscillation (BAO) measurements or results from the Wilkinson Microwave Anisotropy Probe (WMAP). We also obtain simultaneous constraints on cosmological parameters and redshift evolution of the galaxy velocity function, finding no evidence for redshift evolution at z 1 in any combinations of constraints. For instance, number density evolution quantified as ? n ? dln */dln (1 + z) and the velocity dispersion evolution ?? ? dln ?*/dln (1 + z) are constrained to ? n = 1.06+1.36 –1.39(stat.)+0.33 –0.64(syst.) and ?? = –0.05+0.19 –0.16(stat.)+0.03 –0.03(syst.), respectively, when the SQLS result is combined with BAO and WMAP for flat models with a cosmological constant. We find that a significant amount of dark energy is preferred even after fully marginalizing over the galaxy evolution parameters. Thus, the statistics of lensed quasars robustly confirm the accelerated cosmic expansion.

Masamune Oguri; Naohisa Inada; Michael A. Strauss; Christopher S. Kochanek; Issha Kayo; Min-Su Shin; Tomoki Morokuma; Gordon T. Richards; Cristian E. Rusu; Joshua A. Frieman; Masataka Fukugita; Donald P. Schneider; Donald G. York; Neta A. Bahcall; Richard L. White

2012-01-01T23:59:59.000Z

395

Polarimetric performance of a Laue lens gamma-ray CdZnTe focal plane prototype  

SciTech Connect

A gamma-ray telescope mission concept [gamma ray imager (GRI)] based on Laue focusing techniques has been proposed in reply to the European Space Agency call for mission ideas within the framework of the next decade planning (Cosmic Vision 2015-2025). In order to optimize the design of a focal plane for this satellite mission, a CdZnTe detector prototype has been tested at the European Synchrotron Radiation Facility under an {approx}100% polarized gamma-ray beam. The spectroscopic, imaging, and timing performances were studied and in particular its potential as a polarimeter was evaluated. Polarization has been recognized as being a very important observational parameter in high energy astrophysics (>100 keV) and therefore this capability has been specifically included as part of the GRI mission proposal. The prototype detector tested was a 5 mm thick CdZnTe array with an 11x11 active pixel matrix (pixel area of 2.5x2.5 mm{sup 2}). The detector was irradiated by a monochromatic linearly polarized beam with a spot diameter of about 0.5 mm over the energy range between 150 and 750 keV. Polarimetric Q factors of 0.35 and double event relative detection efficiency of 20% were obtained. Further measurements were performed with a copper Laue monochromator crystal placed between the beam and the detector prototype. In this configuration we have demonstrated that a polarized beam does not change its polarization level and direction after undergoing a small angle (<1 deg.) Laue diffraction inside a crystal.

Curado da Silva, R. M. [Departmento de Fisica, Universidade de Coimbra, P-3000 Coimbra (Portugal); Center for Space Radiations, Univesite Catholique de Louvain (Belgium); Caroli, E.; Stephen, J. B.; Schiavone, F.; Donati, A.; Ventura, G. [Istituto di Astrofisica Spaziale e Fisica Cosmica-Bologna, Via Gobetti 101, I-40129 Bologna (Italy); Pisa, A.; Auricchio, N.; Frontera, F. [Dipartimento di Fisica, Universita di Ferrara, Ferrara (Italy); Del Sordo, S. [Istituto di Astrofisica Spaziale e Fisica Cosmica-Palermo, Via Ugo La Malfa 153, 90146 Palermo (Italy); Honkimaeki, V. [European Synchrotron Radiation Facility, Grenoble (France); Trindade, A. M. F. [Departmento de Fisica, Universidade de Coimbra, P-3000 Coimbra (Portugal)

2008-10-15T23:59:59.000Z

396

Performance parameters of a liquid filled ionization chamber array  

SciTech Connect

Purpose: In this work, the properties of the two-dimensional liquid filled ionization chamber array Octavius 1000SRS (PTW-Freiburg, Germany) for use in clinical photon-beam dosimetry are investigated.Methods: Measurements were carried out at an Elekta Synergy and Siemens Primus accelerator. For measurements of stability, linearity, and saturation effects of the 1000SRS array a Semiflex 31013 ionization chamber (PTW-Freiburg, Germany) was used as a reference. The effective point of measurement was determined by TPR measurements of the array in comparison with a Roos chamber (type 31004, PTW-Freiburg, Germany). The response of the array with varying field size and depth of measurement was evaluated using a Semiflex 31010 ionization chamber as a reference. Output factor measurements were carried out with a Semiflex 31010 ionization chamber, a diode (type 60012, PTW-Freiburg, Germany), and the detector array under investigation. The dose response function for a single detector of the array was determined by measuring 1 cm wide slit-beam dose profiles and comparing them against diode-measured profiles. Theoretical aspects of the low pass properties and of the sampling frequency of the detector array were evaluated. Dose profiles measured with the array and the diode detector were compared, and an intensity modulated radiation therapy (IMRT) field was verified using the Gamma-Index method and the visualization of line dose profiles.Results: The array showed a short and long term stability better than 0.1% and 0.2%, respectively. Fluctuations in linearity were found to be within ±0.2% for the vendor specified dose range. Saturation effects were found to be similar to those reported in other studies for liquid-filled ionization chambers. The detector's relative response varied with field size and depth of measurement, showing a small energy dependence accounting for maximum signal deviations of ±2.6% from the reference condition for the setup used. The ?-values of the Gaussian dose response function for a single detector of the array were found to be (0.72 ± 0.25) mm at 6 MV and (0.74 ± 0.25) mm at 15 MV and the corresponding low pass cutoff frequencies are 0.22 and 0.21 mm{sup ?1}, respectively. For the inner 5 × 5 cm{sup 2} region and the outer 11 × 11 cm{sup 2} region of the array the Nyquist theorem is fulfilled for maximum sampling frequencies of 0.2 and 0.1 mm{sup ?1}, respectively. An IMRT field verification with a Gamma-Index analysis yielded a passing rate of 95.2% for a 3 mm/3% criterion with a TPS calculation as reference.Conclusions: This study shows the applicability of the Octavius 1000SRS in modern dosimetry. Output factor and dose profile measurements illustrated the applicability of the array in small field and stereotactic dosimetry. The high spatial resolution ensures adequate measurements of dose profiles in regular and intensity modulated photon-beam fields.

Poppe, B.; Stelljes, T. S.; Looe, H. K.; Chofor, N. [Clinic for Radiation Therapy, Pius-Hospital, Oldenburg 26121, Germany and WG Medical Radiation Physics, Carl von Ossietzky University, Oldenburg 26121 (Germany)] [Clinic for Radiation Therapy, Pius-Hospital, Oldenburg 26121, Germany and WG Medical Radiation Physics, Carl von Ossietzky University, Oldenburg 26121 (Germany); Harder, D. [Prof. em., Medical Physics and Biophysics, Georg August University, Göttingen 37073 (Germany)] [Prof. em., Medical Physics and Biophysics, Georg August University, Göttingen 37073 (Germany); Willborn, K. [Clinic for Radiation Therapy, Pius-Hospital, Oldenburg 26121 (Germany)] [Clinic for Radiation Therapy, Pius-Hospital, Oldenburg 26121 (Germany)

2013-08-15T23:59:59.000Z

397

Josephson Junction Arrays with Bose-Einstein Condensates  

E-Print Network (OSTI)

We report on the direct observation of an oscillating atomic current in a one-dimensional array of Josephson junctions realized with an atomic Bose-Einstein condensate. The array is created by a laser standing-wave, with the condensates trapped in the valleys of the periodic potential and weakly coupled by the inter-well barriers. The coherence of multiple tunneling between adjacent wells is continuously probed by atomic interference. The square of the small-amplitude oscillation frequency is proportional to the microscopic tunneling rate of each condensate through the barriers, and provides a direct measurement of the Josephson critical current as a function of the intermediate barrier heights. Our superfluid array may allow investigation of phenomena so far inaccessible to superconducting Josephson junctions and lays a bridge between the condensate dynamics and the physics of discrete nonlinear media.

F. S. Cataliotti; S. Burger; C. Fort; P. Maddaloni; F. Minardi; A. Trombettoni; A. Smerzi; M. Inguscio

2001-08-07T23:59:59.000Z

398

Analysis of Enriched Uranyl Nitrate in Nested Annular Tank Array  

SciTech Connect

Two series of experiments were performed at the Rocky Flats Critical Mass Laboratory during the 1980s using highly enriched (93%) uranyl nitrate solution in annular tanks. [1, 2] Tanks were of typical sizes found in nuclear production plants. Experiments looked at tanks of varying radii in a co-located set of nested tanks, a 1 by 2 array, and a 1 by 3 array. The co-located set of tanks had been analyzed previously [3] as a benchmark for inclusion within the International Handbook of Evaluated Criticality Safety Benchmark Experiments. [4] The current study represents the benchmark analysis of the 1 by 3 array of a series of nested annular tanks. Of the seventeen configurations performed in this set of experiments, twelve were evaluated and nine were judged as acceptable benchmarks.

John D. Bess; James D. Cleaver

2009-06-01T23:59:59.000Z

399

Micromagnetic simulations of small arrays of submicron ferromagnetic particles  

Science Journals Connector (OSTI)

We report the results of a set of simulations of small arrays of submicron ferromagnetic particles. The actions of dipolar and exchange interactions were qualitatively investigated by analyzing the ferromagnetic resonance spectra at 9.37 GHz resulting from the magnetization response of connected and unconnected particles in the array as a function of the applied dc magnetic field. We find that the magnetization precession movement (at resonance) observed in individual particles in the array presents a distinctive behavior (an “amplitude mismatch”) in comparison to isolated one-particle reference simulations, a result that we attribute to the action of interparticle dipolar couplings. Exchange interactions appear to have an important role in modifying the spectra of connected particles even through a small contact surface.

Christine C. Dantas and Luiz A. de Andrade

2008-07-31T23:59:59.000Z

400

Signal Attenuation Curve for Different Surface Detector Arrays  

E-Print Network (OSTI)

Modern cosmic ray experiments consisting of large array of particle detectors measure the signals of electromagnetic or muon components or their combination. The correction for an amount of atmosphere passed is applied to the surface detector signal before its conversion to the shower energy. Either Monte Carlo based approach assuming certain composition of primaries or indirect estimation using real data and assuming isotropy of arrival directions can be used. Toy surface arrays of different sensitivities to electromagnetic and muon components are assumed in MC simulations to study effects imposed on attenuation curves for varying composition or possible high energy anisotropy. The possible sensitivity of the attenuation curve to the mass composition is also tested for different array types focusing on a future apparatus that can separate muon and electromagnetic component signals.

Vicha, J; Nosek, D; Ebr, J

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

Triaxial thermopile array geo-heat-flow sensor  

DOE Patents (OSTI)

A triaxial thermopile array geothermal heat flow sensor is designed to measure heat flow in three dimensions in a reconstituted or unperturbed subsurface regime. Heat flow can be measured in conductive or permeable convective media. The sensor may be encased in protective pvc tubing and includes a plurality of thermistors and an array of heat flow transducers produce voltage proportional to heat flux along the subsurface regime and permit direct measurement of heat flow in the subsurface regime. The presence of the thermistor array permits a comparison to be made between the heat flow estimates obtained from the transducers and heat flow calculated using temperature differences and Fourier's Law. The device is extremely sensitive with an accuracy of less than 0.1 Heat Flow Units (HFU) and may be used for long term readings. 6 figs.

Carrigan, C.R.; Hardee, H.C.; Reynolds, G.D.; Steinfort, T.D.

1990-01-01T23:59:59.000Z

402

Micro-array collimators for X-rays and neutrons  

SciTech Connect

The authors describe the fabrication techniques of novel, compact optical elements for collimating and/or focusing beams of X-rays or thermal neutrons. These optical elements are solid composite arrays consisting of regular stacks of alternating micro-foils, analogous in action to Soller slit collimators, but up to three orders of magnitude smaller. The arrays are made of alternating metals with suitable refractive indices for reflection and/or absorption of the specific radiation. In one implementation, the arrays are made of stacked micro-foils of transmissive elements (Al, Cu) coated and/or electroplated with absorbing elements (Gd, Cd), which are repeatedly rolled or drawn and restacked to achieve the required collimation parameters. The authors present results of these collimators using both X-rays and neutrons. The performance of the collimating element is limited only by the choice of micro-foil materials and the uniformity of their interfaces.

Cimmino, A.; Allman, B.E.; Klein, A.G. [Univ. of Melbourne, Parkville (Australia). School of Physics; Hamilton, W.A. [Oak Ridge National Lab., TN (United States). Solid State Div.; Anderson, I.S.; Hamelin, B.; Joeghoej, P. [Inst. Laue-Langevin, Grenoble (France); Bastie, P. [Univ. Joseph Fourier-Grenoble, Saint-Martin-d`Heres (France). Lab. de Spectrometrie Physique

1998-08-01T23:59:59.000Z

403

Triaxial thermopile array geo-heat-flow sensor  

DOE Patents (OSTI)

A triaxial thermopile array geothermal heat flow sensor is designed to measure heat flow in three dimensions in a reconstituted or unperturbed subsurface regime. Heat flow can be measured in conductive or permeable convective media. The sensor may be encased in protective pvc tubing and includes a plurality of thermistors and an array of heat flow transducers arranged in a vertical string. The transducers produce voltage proportional to heat flux along the subsurface regime and permit direct measurement of heat flow in the subsurface regime. The presence of the thermistor array permits a comparison to be made between the heat flow estimates obtained from the transducers and heat flow calculated using temperature differences and Fourier's Law. The device is extremely sensitive with an accuracy of less than 0.1 Heat Flow Units (HFU) and may be used for long term readings.

Carrigan, Charles R. (Tracy, CA); Hardee, Harry C. (Albuquerque, NM); Reynolds, Gerald D. (Tijeras, NM); Steinfort, Terry D. (Tijeras, NM)

1992-01-01T23:59:59.000Z

404

Photovoltaic properties of GaAs:Be nanowire arrays  

SciTech Connect

Arrays of GaAs:Be nanowires are synthesized by molecular beam epitaxy on GaAs(111)B substrates. Prototypes of photovoltaic converters in which the grown nanowire arrays are used as active layers are produced by means of successive photolithography, etching, and metallization processes. Studying the photovoltaic properties of the fabricated structures using a solar radiation simulator demonstrates that the solarenergy conversion efficiency is about 0.1%. The value of the efficiency recalculated with the area occupied by the p-type nanowires on the surface of the n-type GaAs substrate taken into account amounts to 1.1%.

Bouravleuv, A. D.; Beznasyuk, D. V.; Gilstein, E. P. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation); Tchernycheva, M.; Luna Bugallo, A. De; Rigutti, L. [University Paris Sud 11, Institut d'Electronique Fondamentale UMR CNRS 8622 (France); Yu, L. [CNRS, Laboratoire de Physique des Interfaces et des Couches Minces (LPICM), Ecole Polytechnique (France); Proskuryakov, Yu. [University of Liverpool, Stephenson Institute for Renewable Energy (United Kingdom); Shtrom, I. V.; Timofeeva, M. A. [Russian Academy of Sciences, St. Petersburg Academic University-Nanotechnology Research and Education Center (Russian Federation); Samsonenko, Yu. B.; Khrebtov, A. I.; Cirlin, G. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)

2013-06-15T23:59:59.000Z

405

Anomalous Finite-Size Effect in Superconducting Josephson Junction Arrays  

SciTech Connect

We show that a previously reported discrepancy between simulations of superconducting Josephson junction arrays and the theoretical analysis of Ambegaokar, Halperin, Nelson, and Siggia (AHNS) [Phys. Rev. Lett. 40, 783 (1978)] is rooted in a peculiar finite-size effect under periodic boundary conditions. Our simulation results for the largest array support the power-law I-V curves predicted by AHNS. Analysis of the vortex dynamics reveals two intrinsic length scales set by the applied current, which define three size regimes with distinctive I-V characteristics.

Chen, Qing-Hu; Tang, Lei-Han; Tong, Peiqing

2001-08-06T23:59:59.000Z

406

Tunneling qubit operation on a protected Josephson junction array  

SciTech Connect

We propose a complete quantum computation process on a topologically protected Josephson junction array system, originally proposed by Ioffe and Feigel'man [Phys. Rev. B 66, 224503 (2002)]. Logical qubits for computation are encoded in the punctured array. The number of qubits is determined by the number of holes. The topological degeneracy is lightly shifted by tuning the flux along specific paths. We show how to perform both single-qubit and basic quantum-gate operations in this system, especially the controlled-NOT (CNOT) gate.

Yin Zhi; Li Shengwen; Chen Yixin [Zhejiang Insitute of Modern Physics, Zhejiang University, Hangzhou 310027 (China)

2010-01-15T23:59:59.000Z

407

Diagnostics for studying the dynamics of wire array Z pinches  

SciTech Connect

The evolution of a wire array Z pinch encompasses a huge range of conditions--with spatial dimensions varying from micrometers to centimeters, densities from solid metal through plasmas of 10{sup 15}-10{sup 22} e{sup -} cm{sup -3}, and temperatures from sub-eV to many 100 eV. We present a summary of the diagnostics developed and used at the Imperial College MAGPIE facility to study the formation and dynamics of plasma in wire array Z pinches, describing the plasma conditions for which they are useful, their various limitations, and some of the novel diagnostic techniques applied.

Bland, S. N.; Bott, S. C.; Hall, G. N.; Lebedev, S. V.; Suzuki, F.; Ampleford, D. J.; Palmer, J. B. A.; Pikuz, S. A.; Shelkovenko, T. A. [Blackett Laboratory, Imperial College, London SW7 2BZ (United Kingdom); Sandia National Laboratories, Albuquerque, New Mexico 87123 (United States); AWE Plc., Aldermaston, Reading RG7 4PR (United Kingdom); Laboratory of Plasma Studies, Cornell University, Ithaca, New York 14853 (United States)

2006-10-15T23:59:59.000Z

408

Opto-Electronics in Large Array Gas Detector Systems  

E-Print Network (OSTI)

Large array gas detector systems are used in particle and nuclear physics experiments involving high-energy nucleon-nucleon and heavy-ion collisions. We have observed that in large array gas detector systems the momentary discharges inside the detector cells result in slowdown of High Voltage conditioning and possible hindrances in signal processing. We have explored the opto-electronic devices like the opto-coupler, optical fibre and signal processing circuit, which provide successful monitoring procedures and preventive measures to overcome the challenges produced in such complex detector systems.

Majumdar, M R D; Nayak, T K; Das, Debasish; Nayak, Tapan K.

2005-01-01T23:59:59.000Z

409

Multi-tower line focus Fresnel array project  

SciTech Connect

As an alternative to conventional tracking solar thermal trough systems, one may use line focus Fresnel reflector systems. In a conventional Fresnel reflector design, each field of reflectors is directed to a single tower. However efficient systems of very high ground utilisation can be setup if a field of reflectors uses multiple receivers on different towers. This paper describes a line focus system, called the compact linear fresnel reflector system and a project to produce an initial 95 MWth solar array. The array will be used as a retrofit preheater for a coal fired generating plant.

Mills, D.R.; Morrison, G.; Pye, J.; Le Lievre, P. [Solar Heat & Power SHP Pty. Ltd., Sydney, NSW (Australia)

2006-02-15T23:59:59.000Z

410

Dissecting the Gravitational Lens B1608 656. II. Precision Measurements of the Hubble Constant, Spatial Curvature, and the Dark Energy Equation of State  

SciTech Connect

Strong gravitational lens systems with measured time delays between the multiple images provide a method for measuring the 'time-delay distance' to the lens, and thus the Hubble constant. We present a Bayesian analysis of the strong gravitational lens system B1608+656, incorporating (1) new, deep Hubble Space Telescope (HST) observations, (2) a new velocity dispersion measurement of 260 {+-} 15 km s{sup -1} for the primary lens galaxy, and (3) an updated study of the lens environment. Our analysis of the HST images takes into account the extended source surface brightness, and the dust extinction and optical emission by the interacting lens galaxies. When modeling the stellar dynamics of the primary lens galaxy, the lensing effect, and the environment of the lens, we explicitly include the total mass distribution profile logarithmic slope {gamma}{prime} and the external convergence {kappa}{sub ext}; we marginalize over these parameters, assigning well-motivated priors for them, and so turn the major systematic errors into statistical ones. The HST images provide one such prior, constraining the lens mass density profile logarithmic slope to be {gamma}{prime} = 2.08 {+-} 0.03; a combination of numerical simulations and photometric observations of the B1608+656 field provides an estimate of the prior for {kappa}{sub ext}: 0.10{sub -0.05}{sup +0.08}. This latter distribution dominates the final uncertainty on H{sub 0}. Fixing the cosmological parameters at {Omega}{sub m} = 0.3, {Omega}{sub {Lambda}} = 0.7, and w = -1 in order to compare with previous work on this system, we find H{sub 0} = 70.6{sub -3.1}{sup +3.1} km s{sup -1} Mpc{sup -1}. The new data provide an increase in precision of more than a factor of two, even including the marginalization over {kappa}{sub ext}. Relaxing the prior probability density function for the cosmological parameters to that derived from the WMAP 5-year data set, we find that the B1608+656 data set breaks the degeneracy between {Omega}{sub m} and {Omega}{sub {Lambda}} at w = -1 and constrains the curvature parameter to be -0.031 < {Omega}{sub k} < 0.009 (95% CL), a level of precision comparable to that afforded by the current Type Ia SNe sample. Asserting a flat spatial geometry, we find that, in combination with WMAP, H{sub 0} = 69.7{sub 5.0}{sup +4.9} km s{sup -1} Mpc{sup -1} and w = -0.94{sub -0.19}{sup +0.17} (68% CL), suggesting that the observations of B1608+656 constrain w as tightly as do the current Baryon Acoustic Oscillation data.

Suyu, S.H.; /Argelander Inst. Astron.; Marshall, P.J.; /KIPAC, Menlo Park /UC, Santa Barbara; Auger, M.W.; /UC, Santa Barbara /UC, Davis; Hilbert, S.; /Argelander Inst. Astron. /Garching, Max Planck Inst.; Blandford, R.D.; /KIPAC, Menlo Park; Koopmans, L.V.E.; /Kapteyn Astron. Inst., Groningen; Fassnacht, C.D.; /UC, Davis; Treu, T.; /UC, Santa Barbara

2009-12-11T23:59:59.000Z

411

Sacramento Municipal Utility District Solar Array | Open Energy Information  

Open Energy Info (EERE)

Utility District Solar Array Utility District Solar Array Jump to: navigation, search Name Sacramento Municipal Utility District Solar Array Facility Sacramento Municipal Utility District Solar Array Sector Solar Facility Type Ground-mounted fixed tilt Owner EnXco Developer EnXco Energy Purchaser Sacramento Municipal Utility District Location Sacramento County, California Coordinates 38.47467°, -121.3541631° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":38.47467,"lon":-121.3541631,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

412

Water wave transmission by an array of floating discs  

Science Journals Connector (OSTI)

...high-concentration arrays are attributed to wave overwash of the discs and collisions...wave-scattering theories. They are used to predict attenuation rates of ocean-surface...ice-covered ocean, noting alternative theories to model waves in the ice-covered ocean also...

2015-01-01T23:59:59.000Z

413

Phased laser array with tailored spectral and coherence properties  

DOE Patents (OSTI)

Architectures for coherently combining an array of fiber-based lasers are provided. By matching their lengths to within a few integer multiples of a wavelength, the spatial and temporal properties of a single large laser are replicated, while extending the average or peak pulsed power limit.

Messerly, Michael J; Dawson, Jay W; Beach, Raymond J

2014-05-20T23:59:59.000Z

414

Array of titanium dioxide nanostructures for solar energy utilization  

DOE Patents (OSTI)

An array of titanium dioxide nanostructures for solar energy utilization includes a plurality of nanotubes, each nanotube including an outer layer coaxial with an inner layer, where the inner layer comprises p-type titanium dioxide and the outer layer comprises n-type titanium dioxide. An interface between the inner layer and the outer layer defines a p-n junction.

Qiu, Xiaofeng; Parans Paranthaman, Mariappan; Chi, Miaofang; Ivanov, Ilia N; Zhang, Zhenyu

2014-12-30T23:59:59.000Z

415

Microwave coupling of frequency-locked Josephson junction arrays  

SciTech Connect

A high temperature superconducting YBa{sub 2}Cu{sub 3}O{sub y} array of five Josephson junctions designed with additional coupling lines has been developed to demonstrate the effects of frequency locking and impedance matching for applications such as oscillators, mixers, and detectors. The Josephson self-radiation power was directly detected by a superheterodyne receiver, and Shapiro steps were also measured. The Josephson self-radiation properties reveal good quality of phase locking and microwave coupling with external circuits. The maximum self-radiation power of our array is about 50 pW which is several ten times higher than that of a single Josephson junction, and its peak point exactly satisfies the Josephson current-voltage relation. The Shapiro-step measurements show that the behavior of current-voltage curve depends on the effective inductance of coupling lines which affects the total impedance of Josephson junction array and microwave coupling. The Josephson oscillation frequency was obtained up to about 880 GHz which is 73{percent} of the maximum available frequency calculated from the characteristic voltage of the Josephson junctions. Experimental results show that this type of Josephson junction array can improve the Josephson self-radiation power and increase the maximum detectable frequency. {copyright} {ital 1997 American Institute of Physics.}

Song, I.; Eom, Y.; Park, G. [Department of Physics, Sogang University, Seoul 100-611 (Korea)] [Department of Physics, Sogang University, Seoul 100-611 (Korea); Lee, E.; Park, S. [Electronic Materials Laboratory, Samsung Advanced Institute of Technology, Suwon (Korea)] [Electronic Materials Laboratory, Samsung Advanced Institute of Technology, Suwon (Korea)

1997-06-01T23:59:59.000Z

416

Conditions for synchronization in Josephson-junction arrays  

SciTech Connect

An effective perturbation theoretical method has been developed to study the dynamics of Josephson Junction series arrays. It is shown that the inclusion of Junction capacitances, often ignored, has a significant impact on synchronization. Comparison of analytic with computational results over a wide range of parameters shows excellent agreement.

Chernikov, A.A.; Schmidt, G. [Stevens Institute of Technology, Hoboken, NJ (United States)

1995-12-31T23:59:59.000Z

417

Taming Hurricanes With Arrays of Offshore Wind Turbines  

E-Print Network (OSTI)

Taming Hurricanes With Arrays of Offshore Wind Turbines Mark Z. Jacobson Cristina Archer, Willet #12;Representation of a vertically-resolved wind turbine in model Lines are model layers) or 50 m/s (destruction) speed. Can Walls of Offshore Wind Turbines Dissipate Hurricanes? #12;Katrina

Firestone, Jeremy

418

Small Area Array-Based LED Luminaire Design  

SciTech Connect

This report contains a summary of technical achievements during a three-year project to demonstrate high efficiency LED luminaire designs based on small area array-based gallium nitride diodes. Novel GaN-based LED array designs are described, specifically addressing the thermal, optical, electrical and mechanical requirements for the incorporation of such arrays into viable solid-state LED luminaires. This work resulted in the demonstration of an integrated luminaire prototype of 1000 lumens cool white light output with reflector shaped beams and efficacy of 89.4 lm/W at CCT of 6000oK and CRI of 73; and performance of 903 lumens warm white light output with reflector shaped beams and efficacy of 63.0 lm/W at CCT of 2800oK and CRI of 82. In addition, up to 1275 lumens cool white light output at 114.2 lm/W and 1156 lumens warm white light output at 76.5 lm/W were achieved if the reflector was not used. The success to integrate small area array-based LED designs and address thermal, optical, electrical and mechanical requirements was clearly achieved in these luminaire prototypes with outstanding performance and high efficiency.

Thomas Yuan

2008-01-09T23:59:59.000Z

419

Halbach array motor/generators: A novel generalized electric machine  

SciTech Connect

In August 1979, Halbach submitted a paper entitled ``Design of Permanent Multipole Magnets with Oriented Rare Earth Cobalt Material.`` In this paper, he presented a novel method of generating multipole magnetic fields using non-intuitive geometrical arrangements of permanent magnets. In subsequent publications, he further defined these concepts. Of particular interest to one of the authors (RFP) was the special magnet array that generated a uniform dipole field. In 1990 Post proposed the construction of an electric machine (a motor/generator) using a dipole field based on Klaus Halbach`s array of permanent magnets. He further proposed that such a system should be employed as an integral part of ``an electromechanical battery`` (EMB), i.e., a modular flywheel system to be used as a device for storing electrical energy, as an alternative to the electrochemical storage battery. This paper reviews Halbach`s theory for the generation of a dipole field using an array of permanent magnet bars, presents a simple analysis of a family of novel ``ironless`` electric machines designed using the dipole Halbach array, and describes the results obtained when they were tested in the laboratory.

Merritt, B.T.; Post, R.F.; Dreifuerst, G.R.; Bender, D.A.

1994-10-28T23:59:59.000Z

420

Conditions for synchronization in Josephson-junction arrays  

SciTech Connect

An effective perturbation theoretical method has been developed to study the dynamics of Josephson-junction series arrays. It is shown that the inclusion of junction capacitances, which is often ignored, has a significant impact on synchronization. Comparison of analytic with computational results over a wide range of parameters shows excellent agreement.

Chernikov, A.A.; Schmidt, G. [Stevens Institute of Technology, Hoboken, New Jersey 07030 (United States)] [Stevens Institute of Technology, Hoboken, New Jersey 07030 (United States)

1995-10-01T23:59:59.000Z

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


421

Multi-modal transmission of microwaves through hole arrays  

E-Print Network (OSTI)

. R. Evans, and J. R. Sambles, "Experimental verification of designer surface plasmons," Science 308Multi-modal transmission of microwaves through hole arrays James D. Edmunds,1,* Euan Hendry,1(5722), 670­672 (2005). 8. S. A. Maier, S. R. Andrews, L. Martín-Moreno, and F. J. García-Vidal, "Terahertz

Exeter, University of

422

Passive Detection of Narrowband Sources Using a Sensor Array  

SciTech Connect

In this report we derive a model for a highly scattering medium, implemented as a set of MATLAB functions. This model is used to analyze an approach for using time-reversal to enhance the detection of a single frequency source in a highly scattering medium. The basic approach is to apply the singular value decomposition to the multistatic response matrix for a time-reversal array system. We then use the array in a purely passive mode, measuring the response to the presence of a source. The measured response is projected onto the singular vectors, creating a time-reversal pseudo-spectrum. We can then apply standard detection techniques to the pseudo-spectrum to determine the presence of a source. If the source is close to a particular scatterer in the medium, then we would expect an enhancement of the inner product between the array response to the source with the singular vector associated with that scatterer. In this note we begin by deriving the Foldy-Lax model of a highly scattering medium, calculate both the field emitted by the source and the multistatic response matrix of a time-reversal array system in the medium, then describe the initial analysis approach.

Chambers, D H; Candy, J V; Guidry, B L

2007-10-24T23:59:59.000Z

423

ALGORITHMICPARTIALANALOG-TO-DIGITALCONVERSION IN MIXED-SIGNAL ARRAY PROCESSORS  

E-Print Network (OSTI)

ALGORITHMICPARTIALANALOG-TO-DIGITALCONVERSION IN MIXED-SIGNAL ARRAY PROCESSORS Roman Genov',2and,Baltimore, MD 21218-2686 E-mail: roman@eecg.toronto.edu,gert@jhu.edu ABSTRACT We present an algorithmic analog with digital post-accumulation, and row-cumulative ADC with analog pre-accumulation. Simulation results

Genov, Roman

424

Modeling the Performance and Energy of Storage Arrays  

E-Print Network (OSTI)

, it is desirable that techniques provide their energy savings while minimizing their impact on performance. DespiteModeling the Performance and Energy of Storage Arrays Sankaran Sivathanu Georgia Institute techniques for power optimization in storage. Given an ar- bitrary trace of disk requests, we split

Liu, Ling

425

Government, Industry Efforts Yield Array Of Tools To Combat Terrorism  

Science Journals Connector (OSTI)

Government, Industry Efforts Yield Array Of Tools To Combat Terrorism ... The blast, the deadliest terrorist attack ever on U.S. soil, has riveted the nation in a way quite different from other acts of terrorism, such as the destruction of Pan Am flight 103 over Scotland in 1988 and the bombing of New York City's World Trade Center in 1993. ...

A. MAUREEN ROUHI

1995-07-24T23:59:59.000Z

426

Microprocessor-controlled photovoltaic-array loading unit  

SciTech Connect

Described is a microprocessor-controlled test system in operation at the Photovoltaics Advanced Systems Test Facility located at Sandia National Laboratories. The test system is designed to measure the total energy output of photovoltaic arrays. The theory, installation, operation, and calibration of the test system are described.

Russell, D.F.

1982-08-01T23:59:59.000Z

427

Failure Modes and Effects Analysis 300 Array -LRRR  

E-Print Network (OSTI)

of the Failure Modes and Effects Analysis (FMEA) is to discover critical failure areas in a system and to remove failure areas. 1. 2 This memo contains the results of the final FMEA for the 300 Array LRRR experiment was successfully deployed on the moon as a part of the Apollo 11 mission, this FMEA will not dwell in the aspects

Rathbun, Julie A.

428

Imaging single atoms in a three-dimensional array  

E-Print Network (OSTI)

LETTERS Imaging single atoms in a three-dimensional array KARL D. NELSON, XIAO LI AND DAVID S atom trapped by light is a promising qubit. It has weak, well-understood interactions with the environment, its internal state can be precisely manipulated1 , interactions that entangle atoms can be varied

Loss, Daniel

429

Review of the Solar Array Telescopes David A. Smith  

E-Print Network (OSTI)

to believe that at lower energy, wavefront sampling could have advantages [34]. After the 1973 oil crisisReview of the Solar Array Telescopes David A. Smith Centre d'Etudes Nucl´eaires de Bordeaux sensitive to astrophysical gamma rays with energies beyond the reach of EGRET but below

Paris-Sud XI, Université de

430

Fiber optic hydrophone sensor arrays using low reflectance internal mirrors  

E-Print Network (OSTI)

A new design of fiber optic hydrophone sensor arrays phics. using low reflectance internal mirrors in optical fibers is investigated. The mirrors are produced by fusion arc splicing of two fibers, one of which has a thin film of TiO2 on the end. A...

Lee, Jong-Seo

2012-06-07T23:59:59.000Z

431

THE CHERENKOV TELESCOPE ARRAY for the CTA Consortium  

E-Print Network (OSTI)

The Cherenkov Telescope Array (CTA) is a next-generation observatory proposed for very high-energy gamma rays imaging air Cherenkov telescopes (IACTs), cover an energy range of about four decades (from a few tens of GeV to above 100 TeV), and to enhance angular and energy resolutions. CTA will have a large discovery

Boyer, Edmond

432

Using a CSP Based Programming Model for Reconfigurable Processor Arrays  

Science Journals Connector (OSTI)

The growing trend towards adoption of flexible and heterogeneous, parallel computing architectures has increased the challenges faced by the programming community. We propose a method to program an emerging class of reconfigurable processor arrays by ... Keywords: CSP, Programming Models, Coarse-grained Reconfigurable Architectures

Zain-ul-Abdin; Bertil Svensson

2008-12-01T23:59:59.000Z

433

Position sensor for linear synchronous motors employing halbach arrays  

DOE Patents (OSTI)

A position sensor suitable for use in linear synchronous motor (LSM) drive systems employing Halbach arrays to create their magnetic fields is described. The system has several advantages over previously employed ones, especially in its simplicity and its freedom from being affected by weather conditions, accumulated dirt, or electrical interference from the LSM system itself.

Post, Richard Freeman

2014-12-23T23:59:59.000Z

434

Long, Highly-Ordered High-Temperature Superconductor Nanowire Arrays  

Science Journals Connector (OSTI)

Long, Highly-Ordered High-Temperature Superconductor Nanowire Arrays ... For bulk superconductors, the electrical resistance drops precipitously to zero below the superconducting transition temperature (Tc). ... Even these temperatures are considerably higher than those found in conventional superconductor NWs of similar widths, which are typically below liquid helium temperature (4.2 K). ...

Ke Xu; James R. Heath

2008-10-28T23:59:59.000Z

435

VLSI POTENTIOSTAT ARRAY FOR DISTRIBUTED ELECTROCHEMICAL NEURAL Abhishek Bandyopadhyay1  

E-Print Network (OSTI)

VLSI POTENTIOSTAT ARRAY FOR DISTRIBUTED ELECTROCHEMICAL NEURAL RECORDING Abhishek Bandyopadhyay1, and digitized by a bank of current-mode delta-sigma analog-to-digital (A/D) converters. First-order noise shaping and 4,096-fold over- sampling provide high signal-to-noise ratio for the low- frequency

Cauwenberghs, Gert

436

Unification of arrays in spreadsheets with logic programming  

Science Journals Connector (OSTI)

Unification, one of the key processes underlying logic programming (LP), provides a powerful mechanism for assembling and disassembling structures, lists in particular, by matching patterns. In recent work, we showed how spreadsheets can be enhanced ... Keywords: array, logic programming, spreadsheet, unification

Philip T. Cox; Patrick Nicholson

2008-01-01T23:59:59.000Z

437

Ocean Observatories Initiative: Pacific Northwest The Endurance Array  

E-Print Network (OSTI)

Ocean Observatories Initiative: Pacific Northwest The Endurance Array The processes that shape. The Ocean Observatories Initiative (OOI) will build a 25­30 year laboratory on the seafloor, in the water column, and at the ocean surface. It will make available novel platforms for oceanographic discovery

Kurapov, Alexander

438

GlycoPattern: a web platform for glycan array mining  

Science Journals Connector (OSTI)

......STRUCTURAL BIOINFORMATICS GlycoPattern: a web platform for glycan array mining Sanjay...Anna Tramontano Summary: GlycoPattern is Web-based bioinformatics resource to support...GlycoPattern is freely available on the Web at http://glycopattern.emory.edu......

Sanjay B. Agravat; Joel H. Saltz; Richard D. Cummings; David F. Smith

2014-12-01T23:59:59.000Z

439

Analysis of solar collector array systems using thermography  

SciTech Connect

The use of thermography to analyze large solar collector array systems under dynamic operating conditions is discussed. The research has focused on thermographic techniques and equipment to determine temperature distributions, flow patterns, and air blockages in solar collectors. The results of this extensive study, covering many sites and types of collectors, illustrate the capabilities of infrared analysis as an analysis tool and operation and maintenance procedure when applied to large arrays. Thermographic analysis of most collector systems showed temperature distributions that indicated balanced flow patterns with both the thermographs and the hand-held unit. In three significant cases, blocked or broken collector arrays, which previously had gone undetected, were discovered. Using this analysis, validation studies of large computer codes could examine collector arrays for flow patterns or blockages that could cause disagreement between actual and predicted performance. Initial operation and balancing of large systems could be accomplished without complicated sensor systems not needed for normal operations. Maintenance personnel could quickly check their systems without climbing onto the roof and without complicated sensor systems.

Eden, A.

1980-01-01T23:59:59.000Z

440

Array E PCU Failure Modes, Effects and Criticality Analysis ,...  

E-Print Network (OSTI)

, this circuit would automatically switch power to the redundant unit. 2. 2 INVERTER MODULE ,· The Inverter the Failure Modes, Effect and Criticality Analysis on the Bendix designed Power Con- ditioning Unit resulted in IOOo/o success on all previ- ous arrays plus the following new features: I. Complete Redundancy

Rathbun, Julie A.

Note: This page contains sample records for the topic "microscale lens array" 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

Antenna Array Mutual Coupling Effects on Cellular CDMA Communication Systems  

E-Print Network (OSTI)

demands. One such technique is to increase capacity via digital beamforming and base station antenna and/or receiving, some of the energy that is primarily intended for one antenna ends up at the other and mutual impedances of a collection of two­port networks, such as antenna arrays. Using the mutual

Blostein, Steven D.

442

d-array beamforming during ship's P.Felisberto  

E-Print Network (OSTI)

vessel motion, ocean swells and currents the array adopts a nonlinear shape and the beamformer output output performance is degraded with bear- ing estimation errors, loss of beam power and increased first received 29th September 1995 and in revised form 21st March 1996 The authors are with UCEH

Jesus, Sérgio M.

443

E-Print Network 3.0 - active fail-safe micro-array Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

substrate yield a label- free sensing platform for protein binding in a high-throughput micro-array... of protein binding in a high- throughput micro-array format. II. SPECTRAL...

444

E-Print Network 3.0 - air-shower array combined Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Air Shower Arrays A.I. Mincer 1 New York University, New York, NY 10003... such as gamma ray bursts or to study the time variation of steady'' sources, air shower arrays are...

445

E-Print Network 3.0 - array project experimental Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

sensors (AVSs... conditioner DAQ Array of AVS Data flow in our experimental setup LabView Matlab direction of particle velocity... the directions, estimated by the array of AVSs,...

446

Characterization of novel Hamamatsu Multi Pixel Photon Counter (MPPC) arrays for the GlueX experiment  

SciTech Connect

The novel Hamamatsu Multi Pixel Photon Counter Array S12045(X) is an array of 16 individual MPPCs (3x3 mm{sup 2}) (further in the paper MPPC array channel) each with 3600 G-APD (Geiger-mode Avalanche Photodiodes) pixels (50x50 [{micro}m{sup 2}]). Each MPPC in the array works with its individual reverse bias voltage mode (around 70 V). The paper summarizes the characterization process of MPPC arrays used in GlueX experiment (Hall D, Jefferson Lab). We studied the main features of each MPPC array channel for 2800 MPPC arrays at different temperatures. Two measurement stations were built to extract gain, breakdown voltage, photo detection efficiency (PDE), optical crosstalk and dark rate for each MPPC array channel. The hardware and the data analysis are described, which includes new analytical expressions to obtain the mean number of photo-electrons and optical crosstalk. The dynamical behavior of characterization parameters is presented as well.

Soto, Orlando [Universidad T?cnica Federico Santa Mar?a; Rojas, Rimsky [Universidad T?cnica Federico Santa Mar?a; Kuleshov, Sergey V. [Universidad T?cnica Federico Santa Mar?a; Hakobyan, Hayk [Universidad T?cnica Federico Santa Mar?a; Toro, Alam [Universidad T?cnica Federico Santa Mar?a; Brooks, William K. [Universidad T?cnica Federico Santa Mar?a

2013-12-01T23:59:59.000Z

447

Reliable InP-based Geiger-mode Avalanche Photodiode Arrays  

E-Print Network (OSTI)

Arrays as large as 256 x 64 of single-photon counting avalanche photodiodes have been developed for defense applications in free-space communication and laser radar. Focal plane arrays (FPAs) sensitive to both 1.06 and ...

Smith, Gary M.

448

Capacity Enhancement Based on Using AdaptiveAntenna Arrays OptimizedforTrunking Efficiency  

E-Print Network (OSTI)

will achieve the greatest performance benefit. One approach for utilizing smart antenna arrays has been-cell network where each BS is equipped with an adaptive array. The hexagonal grid is used to illustrate

Howitt, Ivan

449

Effect of nanofiber proximity on the mechanical behavior of high volume fraction aligned carbon nanotube arrays  

E-Print Network (OSTI)

The effect of nanofiber proximity on the mechanical behavior of nanofiber arrays with volume fractions (V f) from 1% to 20% was quantified via nanoindentation of an aligned carbon nanotube (A-CNT) array. The experimental ...

Cebeci, Hülya

450

E-Print Network 3.0 - active phased-array antennas Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

RECTANGULAR SLOT ANTENNAS Summary: composed of rectan- gular slot antennas tuned with patch stubs. The 2D array of 32 32 ele- ments for phased-array... .interscience.wiley. com)....

451

Ultra-efficient, Robust and Well-defined Nano-Array based Monolithic...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Ultra-efficient, Robust and Well-defined Nano-Array based Monolithic Catalysts Ultra-efficient, Robust and Well-defined Nano-Array based Monolithic Catalysts This presentation...

452

U-243: libvirt virTypedParameterArrayClear() Memory Access Error...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

3: libvirt virTypedParameterArrayClear() Memory Access Error Lets Remote Users Deny Service U-243: libvirt virTypedParameterArrayClear() Memory Access Error Lets Remote Users Deny...

453

Dynamic Positional Change and Defocus Curve of a Phakic Foldable Anterior-Chamber Angle-Supported Intraocular Lens during Accommodation  

Science Journals Connector (OSTI)

Objective To evaluate movements of an anterior-chamber angle-supported phakic intraocular lens (PIOL) Cachet (Alcon, Fort Worth, Texas) and their influence on visual acuity during accommodation. Design Prospective case series. Participants We included 54 eyes of 27 patients (15 female, 12 male; age, 38±7.61 years; preoperative manifest spherical equivalent ?8.7±2.5 diopters [D]). Methods Evaluation of the PIOL's positional stability (distance to the corneal endothelium [M1] and the natural lens [M2]) as well as the pre- and postoperative anterior chamber depth (ACD) and pupil diameter (PD). Measurements were performed for accommodation stimuli ranging from ?7 to +1 D in 1-D increments using optical coherence tomography (Visante OCT, Carl Zeiss Meditec, Jena, Germany). The respective defocus curve was evaluated using Early Treatment Diabetic Retinopathy Study charts. Statistical analysis included a Kolmogoroff-Smirnov test for parametric distribution, a Friedman- and consecutive Conover-Iman-Bonferroni test for detection of PD, ACD, and defocus curve differences from before to after the operation, a 1-sided t test for analysis of positional changes (?PD, ?ACD, and ?M values compared with a zero stimulus position), and a regression analysis for the evaluation of influence of age, IOL diameter, and power on ?-values. Significance was set at P = 0.05. Main Outcome Measures Postoperative ?M values. Results The PD, ?PD, ACD, and ?ACD did not differ significantly between pre- and postoperative values. The ?M1 and ?M2 differed significantly from the zero-stimulus position for defocus stimuli of ??3 D and ??2D, respectively; mean ?M1max was ?0.09±0.06 mm for ?7-D stimulus; mean ?M2max was ?0.09±0.10 mm for ?5-/?6-D stimulus. Apart from ?PD, all ?-values decreased with age. Visual acuity was significantly better postoperatively for defocus stimuli between 0 and ?3 D. Conclusions The anterior-chamber angle-supported PIOL changes its position during accommodation only marginally. The PIOL does not affect postoperative accommodation. Financial Disclosure(s) Proprietary or commercial disclosure may be found after the references.

Oliver K. Klaproth; Jörg Rehrmann; Thomas Kohnen

2013-01-01T23:59:59.000Z

454

E-Print Network 3.0 - array intracardiac echocardiography Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

arrays operating... are conventionally performed using 2-D transesophageal ... Source: Smith, Stephen - Department of Biomedical Engineering, Duke University Collection: Biology...

455

Collapse of superconductivity in a hybrid tin-graphene Josephson junction array  

E-Print Network (OSTI)

1 Collapse of superconductivity in a hybrid tin-graphene Josephson junction array Zheng Han1 of the Josephson junction array into a zero-temperature metallic state. The suppression of proximity, models involving specific types of Josephson junction arrays in which superconducting disks are coupled

Boyer, Edmond

456

Simulation of Photovoltaic Array-driven Electric Machines with Power Electronic Interfaces  

Science Journals Connector (OSTI)

Power electronic interfaces between photovoltaic (PV) arrays and electric machines are necessary in order to match the drive characteristics with the characteristics of the array for efficient utilization of the resource. This paper proposes a model ... Keywords: MATLAB/SIMULINK modeling, electric machines, photovoltaic array, power electronics, simulation

S. Arul Daniel; N. Ammasai Gounden

2010-11-01T23:59:59.000Z

457

Josephson-junction arrays with long-range interactions J. Kent Harbaugh and D. Stroud  

E-Print Network (OSTI)

Josephson-junction arrays with long-range interactions J. Kent Harbaugh and D. Stroud Department-voltage (IV) characteristics of a Josephson-junction array with long-range inter- actions. The array consists of two sets of equally spaced parallel superconducting wires placed at right angles. A Josephson junction

Stroud, David

458

Experimental observation of narrow surface plasmon resonances in gold nanoparticle arrays  

E-Print Network (OSTI)

Experimental observation of narrow surface plasmon resonances in gold nanoparticle arrays Yizhuo surface plasmons in two-dimensional gold nanoparticle arrays in water leads to narrow near that the gold nanoparticle arrays exhibit near-field electric field intensity E2 enhancements approximately one

459

Simultaneous Determination of Melamine and 5-Hydroxymethylfurfural in Milk by Capillary Electrophoresis with Diode Array Detection  

Science Journals Connector (OSTI)

Simultaneous Determination of Melamine and 5-Hydroxymethylfurfural in Milk by Capillary Electrophoresis with Diode Array Detection ... This article describes the development of a simple analytical approach for the simultaneous determination of melamine and 5-hydroxymethylfurfural (HMF) in milk samples using capillary electrophoresis (CE) with diode array detection (DAD) for the first time. ... Melamine; 5-hydroxymethylfurfural; milk; capillary electrophoresis; diode array detection ...

Zhijun Chen; Xiaomei Yan

2009-09-17T23:59:59.000Z

460

Design of a Series Fed Circularly Polarized Microstrip Patch Array Lale Alatan  

E-Print Network (OSTI)

Design of a Series Fed Circularly Polarized Microstrip Patch Array Lale Alatan Electrical polarized microstrip patch array operating in S-band (2210 ± 5 MHz) is designed to be used as a sub-array for a ground based antenna receiving signals from a LEO satellite. Slot-coupled square patch antenna is chosen

Alatan, Lale Hayýrlýoðlu

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


461

Permanent Bubble Arrays from a Cross-Linked Poly(para-phenyleneethynylene): Picoliter Holes without Microfabrication  

E-Print Network (OSTI)

Permanent Bubble Arrays from a Cross-Linked Poly(para-phenyleneethynylene): Picoliter Holes without). The holes are formed by heating self-assembled bubble arrays (from 4) to 300 °C. They will be useful evaporating solvents generate hexagonally ordered bubble arrays when moist air is used to evaporate

Srinivasarao, Mohan

462

Modeling and Simulation of Solar PV Arrays under Changing Illumination Conditions  

E-Print Network (OSTI)

the amount of electric power that may be generated from the solar panel at time of use. To be specificModeling and Simulation of Solar PV Arrays under Changing Illumination Conditions Dzung D Nguyen shadows (a passing cloud) on the output power of solar PV arrays. Each solar array is composed of a matrix

Lehman, Brad

463

Rigid Deployable Solar Array A.M. Watt and S. Pellegrino  

E-Print Network (OSTI)

with the design of low-cost rigid-panel deployable solar arrays with self- locking tape-spring hinges. The reportRigid Deployable Solar Array A.M. Watt and S. Pellegrino CUED/D-STRUCT/TR214 Department on the deployment of a solar array wing are evaluated experimentally. #12;#12;Contents 1 Introduction 1 1.1 Layout

Pellegrino, Sergio

464

Novel Designs for Photovoltaic Arrays to Reduce Partial Shading Losses and to Ease Series Arc Fault Detection.  

E-Print Network (OSTI)

??A mismatch in a photovoltaic array implies differences in the I-V characteristics of the modules forming the array which can lead to significant energy losses… (more)

Shams El-Dein, Mohamed

2012-01-01T23:59:59.000Z

465

Fabrication of arrays of nano-superconducting quantum interfernce devices using a double-angle processing approach  

E-Print Network (OSTI)

in a Two-Dimensional Array” Nano Lett. 9, 2009, pp. 3581- S.Fabrication of arrays of nano-superconducting quantum

Roediger, Peter

2014-01-01T23:59:59.000Z

466

Dispenser printing for prototyping microscale devices  

E-Print Network (OSTI)

thin film rechargeable batteries. ” Materials Science andenergy conversion in batteries or electrostatic phenomena ininterface. Zinc-metal oxide batteries with gel electrolytes

Wright, Paul K.; Dornfeld, David A.; Chen, Alic; Ho, Christine C.; Evans, James W.

2010-01-01T23:59:59.000Z

467

Hydraulically-actuated microscale traveling energy recovery  

E-Print Network (OSTI)

As the demand for portable electrical power grows, alternatives to chemical stored energy may enable users with additional system capabilities. This thesis presents a miniature hydroelectric turbine system for use in ...

Robbins, Michael F. (Michael Frank)

2009-01-01T23:59:59.000Z

468

Analysis of micro-scale EDM .  

E-Print Network (OSTI)

??Micro electromechanical systems (MEMS) are presented and the application of electro discharge machining (EDM) to this scale of manufacture is discussed. A model relating input… (more)

Tibbles, Christopher Jeremy

2014-01-01T23:59:59.000Z

469

Fabrication of microscale carbon nanotube fibers  

Science Journals Connector (OSTI)

Carbon nanotubes (CNTs) have excellent mechanical, chemical, and electronic properties, but realizing these excellences in practical applications needs to assemble individual CNTs into larger-scale products. Recently, CNT fibers demonstrate the potential ...

Gengzhi Sun; Yani Zhang; Lianxi Zheng

2012-01-01T23:59:59.000Z

470

Polymeric Mold For Providing A Microscale Part  

DOE Patents (OSTI)

The invention is a developer system for developing a PMMA photoresist having exposed patterns comprising features having both very small sizes, and very high aspect ratios. The developer system of the present invention comprises a developer tank, an intermediate rinse tank and a final rinse tank, each tank having a source of high frequency sonic agitation, temperature control, and continuous filtration. It has been found that by moving a patterned wafer, through a specific sequence of developer/rinse solutions, where an intermediate rinse solution completes development of those portions of the exposed resist left undeveloped after the development solution, by agitating the solutions with a source of high frequency sonic vibration, and by adjusting and closely controlling the temperatures and continuously filtering and recirculating these solutions, it is possible to maintain the kinetic dissolution of the exposed PMMA polymer as the rate limiting step.

Boehme, Dale R. (Pleasanton, CA); Bankert, Michelle A. (San Francisco, CA); Christenson, Todd R. (Albuquerque, NM)

2005-01-11T23:59:59.000Z

471

First Results On Shear-Selected Clusters From the Deep Lens Survey: Optical Imaging, Spectroscopy, and X-ray Followup  

E-Print Network (OSTI)

We present the first sample of galaxy clusters selected on the basis of their weak gravitational lensing shear. The shear induced by a cluster is a function of its mass profile and its redshift relative to the background galaxies being sheared; in contrast to more traditional methods of selecting clusters, shear selection does not depend on the cluster's star formation history, baryon content, or dynamical state. Because mass is the property of clusters which provides constraints on cosmological parameters, the dependence on these other parameters could induce potentially important biases in traditionally-selected samples. Comparison of a shear-selected sample with optically and X-ray selected samples is therefore of great importance. Here we present the first step toward a new shear-selected sample: the selection of cluster candidates from the first 8.6 deg$^2$ of the 20 deg$^2$ Deep Lens Survey (DLS), and tabulation of their basic properties such as redshifts and optical and X-ray counterparts.

Wittman, D; Hughes, J P; Margoniner, V E; Tyson, J A; Cohen, J G; Norman, D

2006-01-01T23:59:59.000Z

472

First Results On Shear-Selected Clusters From the Deep Lens Survey: Optical Imaging, Spectroscopy, and X-ray Followup  

E-Print Network (OSTI)

We present the first sample of galaxy clusters selected on the basis of their weak gravitational lensing shear. The shear induced by a cluster is a function of its mass profile and its redshift relative to the background galaxies being sheared; in contrast to more traditional methods of selecting clusters, shear selection does not depend on the cluster's star formation history, baryon content, or dynamical state. Because mass is the property of clusters which provides constraints on cosmological parameters, the dependence on these other parameters could induce potentially important biases in traditionally-selected samples. Comparison of a shear-selected sample with optically and X-ray selected samples is therefore of great importance. Here we present the first step toward a new shear-selected sample: the selection of cluster candidates from the first 8.6 deg$^2$ of the 20 deg$^2$ Deep Lens Survey (DLS), and tabulation of their basic properties such as redshifts and optical and X-ray counterparts.

D. Wittman; I. P. Dell'Antonio; J. P. Hughes; V. E. Margoniner; J. A. Tyson; J. G. Cohen; D. Norman

2005-07-26T23:59:59.000Z

473

A Rigorous Free-form Lens Model of Abell 2744 to Meet the Hubble Frontier Fields Challenge  

E-Print Network (OSTI)

Deep Hubble Frontier Fields (HFF) imaging of the most powerful lensing clusters provides access to the most magnified distant galaxies. It is a challenge to construct lens models capable of describing these complex massive, merging clusters so that the intrinsic source properties can be meaningfully derived. Here we apply our general free-form lensing method (WSLAP+) to A2744, providing a model independent map of the cluster magnification and geometric distance estimates to multiply-lensed sources. We solve simultaneously for a smooth cluster component on a pixel grid, together with local deflections by the observed member galaxies. Our solution is sufficiently accurate to securely identify 18 multiply-lensed systems behind A2744 totaling 56 images, spanning 1.0

Lam, Daniel; Diego, Jose M; Lim, Jeremy; Coe, Dan; Ford, Holland C; Zheng, Wei

2014-01-01T23:59:59.000Z

474

Resistance of Josephson Junction Arrays at Low Temperatures  

E-Print Network (OSTI)

We study motion of vortices in arrays of Josephson junctions at zero temperature where it is controlled by quantum tunneling from one plaquette to another. The tunneling process is characterized by a finite time and can be slow compared to the superconducting gap (so that $\\tau \\Delta >> 1$). The dissipation which accompanies this process arises from rare processes when a vortex excites a quasiparticle above the gap while tunneling through a single junction. We find that the dissipation is significant even in the case $\\tau \\Delta >> 1$, in particular it is not exponentially small in this parameter. We use the calculated energy dissipation for the single vortex jump to estimate the physical resistance of the whole array.

L. B. Ioffe; B. N. Narozhny

1998-07-25T23:59:59.000Z

475

Superradiant control of ?-ray propagation by vibrating nuclear arrays  

Science Journals Connector (OSTI)

The collective nature of light interactions with atomic and nuclear ensembles yields the fascinating phenomena of superradiance and radiation trapping. We study the interaction of ? rays with a coherently vibrating periodic array of two-level nuclei. Such nuclear motion can be generated, e.g., in ionic crystals illuminated by a strong driving optical laser field. We find that deflection of the incident ? beam into the Bragg angle can be switched on and off by nuclear vibrations on a superradiant time scale determined by the collective nuclear frequency ?a, which is of the order of terahertz. Namely, if the incident ? wave is detuned from the nuclear transition by frequency ???a it passes through the static nuclear array. However, if the nuclei vibrate with frequency ? then parametric resonance can yield energy transfer into the Bragg deflected beam on the superradiant time scale, which can be used for fast control of ? rays.

Xiwen Zhang and Anatoly A. Svidzinsky

2013-09-30T23:59:59.000Z

476

Versatile, high-sensitivity faraday cup array for ion implanters  

DOE Patents (OSTI)

An improved Faraday cup array for determining the dose of ions delivered to a substrate during ion implantation and for monitoring the uniformity of the dose delivered to the substrate. The improved Faraday cup array incorporates a variable size ion beam aperture by changing only an insertable plate that defines the aperture without changing the position of the Faraday cups which are positioned for the operation of the largest ion beam aperture. The design enables the dose sensitivity range, typically 10.sup.11 -10.sup.18 ions/cm.sup.2 to be extended to below 10.sup.6 ions/cm.sup.2. The insertable plate/aperture arrangement is structurally simple and enables scaling to aperture areas between <1 cm.sup.2 and >750 cm.sup.2, and enables ultra-high vacuum (UHV) applications by incorporation of UHV-compatible materials.

Musket, Ronald G. (Danville, CA); Patterson, Robert G. (Dublin, CA)

2003-01-01T23:59:59.000Z

477

Preliminary results of the partial array LCT coil tests  

SciTech Connect

The Large Coil Task (LCT) is a collaboration between the US, Euratom, Japan, and Switzerland for the production and testing of 2.5 x 3.5-m bore, superconducting 8-T magnets. The definitive tests in the design configuration, the six coils arrayed in a compact torus, will begin in 1985. Partial-array tests are being done in 1984. In January the initial cooldown of two coils was aborted because of helium-to-vacuum leaks that developed in certain seal welds when the coil temperatures were 170 to 180 K. In July three adjacent coils (designated JA, GD, CH) were cooled and in August two were energized to the limits of the test facility. An overview of the results are presented, including facility, cooldown (warmup has not yet begun), energization, dump, recovery from intentional normal zones, strain, and displacement, for operation up to 100% of design current but below full field and stress. These initial results are highly encouraging.

Luton, J.N.; Cogswell, F.D.; Dresner, L.; Friesinger, G.M.; Gray, W.H.; Iwasa, Y.; Koizumi, K.; Lubell, M.S.; Lue, J.W.; Nishi, M.F.

1984-09-10T23:59:59.000Z

478

Preliminary results of the partial-array LCT coil tests  

SciTech Connect

The Large Coil Task (LCT) is a collaboration between the US, Euratom, Japan, and Switzerland for the production and testing of 2.5 x 3.5 m bore, superconducting 8-T magnets. The definitive tests in the design configuration, the six coils arrayed in a compact torus, will begin in 1985. Partial-array tests are being done in 1984. In January the initial cooldown of two coils was aborted because of heliumto-vacuum leaks that developed in certain seal welds when the coil temperatures were 170 to 180 K. In July three adjacent coils (designated JA, GD, CH) were cooled, and in August two were energized to the limits of the test facility. An overview of the results is presented, including facility, cooldown, energization, dump, recovery from intentional normal zones, strain, and displacement, for operation up to 100% of design current but below full field and stress. These initial results are highly encouraging.

Luton, J.N.; Cogswell, F.D.; Dresner, L.; Ellis, J.F.; Fietz, W.A.; Friesinger, G.M.; Gray, W.H.; Iwasa, Y.; Koizumi, K.; Lubell, M.

1985-03-01T23:59:59.000Z

479

Proposal of a Bulk HTSC Staggered Array Undulator  

SciTech Connect

We proposed a new type of undulator based on bulk high-T{sub c} superconductors (HTSC) which consists of a single solenoid and a stacked array of bulk HTSC. The main advantage of this configuration is that a mechanical structure is not required to produce and control the undulator field. In order to perform a proof of principle experiment, we have developed a prototype of bulk HTSC staggered array undulator using 11 pairs of DyBaCuO bulk superconductors and a normal conducting solenoid. Experimental results obtained by using the prototype undulator and numerical results obtained by a loop current model based on the Bean mode for a type-II superconductor were compared.

Kii, Toshiteru; Kinjo, Ryota; Bakr, Mahmoud A.; Sonobe, Taro; Higashimura, Keisuke; Masuda, Kai; Ohgaki, Hideaki; Yoshida, Kyohei [Institute of Advanced Energy, Kyoto University, Kyoto, 611-0011 (Japan); Zen, Heisyun [Institute for Molecular Science, National Institute of Natural Sciences, Aichi 444-8585 (Japan)

2010-06-23T23:59:59.000Z

480

Matrix-assisted energy conversion in nanostructured piezoelectric arrays  

DOE Patents (OSTI)

A nanoconverter is capable of directly generating electricity through a nanostructure embedded in a polymer layer experiencing differential thermal expansion in a stress transfer zone. High surface-to-volume ratio semiconductor nanowires or nanotubes (such as ZnO, silicon, carbon, etc.) are grown either aligned or substantially vertically aligned on a substrate. The resulting nanoforest is then embedded with the polymer layer, which transfers stress to the nanostructures in the stress transfer zone, thereby creating a nanostructure voltage output due to the piezoelectric effect acting on the nanostructure. Electrodes attached at both ends of the nanostructures generate output power at densities of .about.20 nW/cm.sup.2 with heating temperatures of .about.65.degree. C. Nanoconverters arrayed in a series parallel arrangement may be constructed in planar, stacked, or rolled arrays to supply power to nano- and micro-devices without use of external batteries.

Sirbuly, Donald J.; Wang, Xianying; Wang, Yinmin

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "microscale lens array" 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

High power density fuel cell comprising an array of microchannels  

DOE Patents (OSTI)

A phosphoric acid fuel cell according to one embodiment includes an array of microchannels defined by a porous electrolyte support structure extending between bottom and upper support layers, the microchannels including fuel and oxidant microchannels; fuel electrodes formed along some of the microchannels; and air electrodes formed along other of the microchannels. A method of making a phosphoric acid fuel cell according to one embodiment includes etching an array of microchannels in a substrate, thereby forming walls between the microchannels; processing the walls to make the walls porous, thereby forming a porous electrolyte support structure; forming anode electrodes along some of the walls; forming cathode electrodes along other of the walls; and filling the porous electrolyte support structure with a phosphoric acid electrolyte. Additional embodiments are also disclosed.

Sopchak, David A; Morse, Jeffrey D; Upadhye, Ravindra S; Kotovsky, Jack; Graff, Robert T

2014-05-06T23:59:59.000Z

482

The Atmospheric Monitoring Strategy for the Cherenkov Telescope Array  

E-Print Network (OSTI)

The Imaging Atmospheric Cherenkov Technique (IACT) is unusual in astronomy as the atmosphere actually forms an intrinsic part of the detector system, with telescopes indirectly detecting very high energy particles by the generation and transport of Cherenkov photons deep within the atmosphere. This means that accurate measurement, characterisation and monitoring of the atmosphere is at the very heart of successfully operating an IACT system. The Cherenkov Telescope Array (CTA) will be the next generation IACT observatory with an ambitious aim to improve the sensitivity of an order of magnitude over current facilities, along with corresponding improvements in angular and energy resolution and extended energy coverage, through an array of Large (23m), Medium (12m) and Small (4m) sized telescopes spread over an area of order ~km$^2$. Whole sky coverage will be achieved by operating at two sites: one in the northern hemisphere and one in the southern hemisphere. This proceedings will cover the characterisation of...

Daniel, M K

2015-01-01T23:59:59.000Z

483

A sensor array system for monitoring moisture dynamics inunsaturated soil  

SciTech Connect

To facilitate investigations of moisture dynamics inunsaturated soil, we have developed a technique to qualitatively monitorpatterns of saturation changes. Field results suggest that this device,the sensor array system (SAS), is suitable for determining changes inrelative wetness along vertical soil profiles. The performance of theseprobes was compared with that of the time domain reflectometry (TDR)technique under controlled and field conditions. Measurements from bothtechniques suggest that by obtaining data at high spatial and temporalresolution, the SAS technique was effective in determining patterns ofsaturation changes along a soil profile. In addition, hardware used inthe SAS technique was significantly cheaper than the TDR system, and thesensor arrays were much easier to install along a soilprofile.

Salve, R.; Cook, P.J.

2007-05-15T23:59:59.000Z

484

DC Resistivity Survey (Schlumberger Array) At Raft River Geothermal Area  

Open Energy Info (EERE)

Area Area (1974-1975) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: DC Resistivity Survey (Schlumberger Array) At Raft River Geothermal Area (1974-1975) Exploration Activity Details Location Raft River Geothermal Area Exploration Technique DC Resistivity Survey (Schlumberger Array) Activity Date 1974 - 1975 Usefulness not indicated DOE-funding Unknown Exploration Basis Hydrogeologic study of the area Notes In 1975, the U.S. Geological Survey made 70 Schlumberger resistivity soundings in the Upper Raft River Valley and in parts of the Raft River Valley. These soundings complement the 79 soundings made previously in the Raft River Valley and bring the total number of soundings to 149. This work was done as part of a hydrogeologic study of the area. The location,

485

Motorist interpretation of potential transition symbols in a freeway lane control signal array  

E-Print Network (OSTI)

. APPENDIX 8 . 59 VITA 66 LIST OF TABLES TABLE 1. Comparison of Houston Auto Show Results and Previous Research Page Subject Response to Yellow Symbols in a Freeway LCS Array: TTI Summer 1992 14 Lane Control Signal Arrays 21 Lane Control Signal... Arrays Shown to Subjects in the TTI 1992 Houston Auto Show Survey . 3. LCS Arrays Shown to Subjects in the TTI Summer 1992 Survey 4. Freeway Scenes Shown to Subjects Participating in Survey: Arrays 1 and 2 . . . . . 22 5. Freeway Scenes Shown...

Wohlschlaeger, Steven D

2012-06-07T23:59:59.000Z

486

Fabrication of high thermal conductivity arrays of carbon nanotubes and their composites  

DOE Patents (OSTI)

Methods and apparatus are described for fabrication of high thermal conductivity arrays of carbon nanotubes and their composites. A composition includes a vertically aligned nanotube array including a plurality of nanotubes characterized by a property across substantially all of the vertically aligned nanotube array. A method includes depositing a vertically aligned nanotube array that includes a plurality of nanotubes; and controlling a deposition rate of the vertically aligned nanotubes array as a function of an in situ monitored property of the plurality of nanotubes.

Geohegan, David B. (Knoxville, TN) [Knoxville, TN; Ivanov, Ilya N. (Knoxville, TN) [Knoxville, TN; Puretzky, Alexander A [Knoxville, TN

2010-07-27T23:59:59.000Z

487

Technical evaluation of Solar Cells, Inc., CdTe modules and array at NREL  

SciTech Connect

The Engineering and Technology Validation Team at the National Renewable Energy Laboratory (NREL) conducts in-situ technical evaluations of polycrystalline thin-film photovoltaic (PV) modules and arrays. This paper focuses on the technical evaluation of Solar Cells, Inc., (SCI) cadmium telluride (CdTe) module and array performance by attempting to correlate individual module and array performance. This is done by examining the performance and stability of the modules and array over a period of more than one year. Temperature coefficients for module and array parameters (P{sub max}V{sub oc}, V{sub max}, I{sub sc}, I{sub max}) are also calculated.

Kroposki, B.; Strand, T.; Hansen, R. [and others] [and others

1996-05-01T23:59:59.000Z

488

The Houston Lightning Mapping Array: Network Installation and Preliminary Analysis  

E-Print Network (OSTI)

in August of the same year. Two additional sensors were added to the network in January 2007, bringing the Houston LDAR-II network to a full set of twelve stations. These sensors were purchased from Vaisala, Inc. who developed a commercial version... functionally similar to the Lightning Mapping Array sensors developed at New Mexico Institute of Mining and Technology. The Houston LDAR-II network remained operational until March 2012 when the network was decommissioned and subsequently replaced...

Cullen, Matthew Ryan

2013-06-25T23:59:59.000Z

489

Physics-based signal processing algorithms for micromachined cantilever arrays  

DOE Patents (OSTI)

A method of using physics-based signal processing algorithms for micromachined cantilever arrays. The methods utilize deflection of a micromachined cantilever that represents the chemical, biological, or physical element being detected. One embodiment of the method comprises the steps of modeling the deflection of the micromachined cantilever producing a deflection model, sensing the deflection of the micromachined cantilever and producing a signal representing the deflection, and comparing the signal representing the deflection with the deflection model.

Candy, James V; Clague, David S; Lee, Christopher L; Rudd, Robert E; Burnham, Alan K; Tringe, Joseph W

2013-11-19T23:59:59.000Z

490

Advanced array techniques for unattended ground sensor applications  

SciTech Connect

Sensor arrays offer opportunities to beam form, and time-frequency analyses offer additional insights to the wavefield data. Data collected while monitoring three different sources with unattended ground sensors in a 16-element, small-aperture (approximately 5 meters) geophone array are used as examples of model-based seismic signal processing on actual geophone array data. The three sources monitored were: (Source 01). A frequency-modulated chirp of an electromechanical shaker mounted on the floor of an underground bunker. Three 60-second time-windows corresponding to (a) 50 Hz to 55 Hz sweep, (b) 60 Hz to 70 Hz sweep, and (c) 80 Hz to 90 Hz sweep. (Source 02). A single transient impact of a hammer striking the floor of the bunker. Twenty seconds of data (with the transient event approximately mid-point in the time window.(Source 11)). The transient event of a diesel generator turning on, including a few seconds before the turn-on time and a few seconds after the generator reaches steady-state conditions. The high-frequency seismic array was positioned at the surface of the ground at a distance of 150 meters (North) of the underground bunker. Four Y-shaped subarrays (each with 2-meter apertures) in a Y-shaped pattern (with a 6-meter aperture) using a total of 16 3-component, high-frequency geophones were deployed. These 48 channels of seismic data were recorded at 6000 and 12000 samples per second on 16-bit data loggers. Representative examples of the data and analyses illustrate the results of this experiment.

Followill, F.E.; Wolford, J.K.; Candy, J.V.

1997-05-06T23:59:59.000Z

491

Parallel recording with optical waveguide array Haifeng Wang*a  

E-Print Network (OSTI)

a linear array of laser diodes onto different tracks operated in the far-field1-5 , and using a linear-mode rectangular waveguide. The material of the guide layer is SiN (n=2.05) and of the cladding layer is SiO2 (n=1.47). The thickness of the cladding (guide) layers are 1100 (800) nm for the multi-mode waveguide and 1120 (160) nm

492

Anharmonic Bloch Oscillations in the Optical Waveguide Array  

E-Print Network (OSTI)

The anharmonic Bloch oscillations of a light beam in the array of optical waveguides are considered. The coupling modes model (CMM) with the second order interaction is used to describe the effect analytically. The formula obtained predicts explicitly the path of the optical beam, in particular, the positions of the turning points are found. A total agreement of this formula with the numerical simulation is confirmed.

Gozman, M I; Kagan, Yu M; Pavlov, A I; Polishchuk, I Ya

2015-01-01T23:59:59.000Z

493

Yield enhancement of VLSI/WSI array systems  

E-Print Network (OSTI)

single wafer, tllils avoiding lugli manufacturing costs. In this research, vield enhancement of two typical VLSI/IVSI array systems, PLAs aud Pipeline 4rrays, is considered Yield enhancement of PLAs tluough reconfiguration is an important issue... is fault-toleriuice for multi-pipelnie structures in the presence cf t'aulty cells A reconfiguration approach, which offers a siniple algonthm and in- terconnection network, small average intercell pipeline clelay and 100~i harvesting. is presented...

Koo, Peter Yunemo

2012-06-07T23:59:59.000Z

494

Microhole Arrays Drilled With Advanced Abrasive Slurry Jet Technology To  

Open Energy Info (EERE)

Microhole Arrays Drilled With Advanced Abrasive Slurry Jet Technology To Microhole Arrays Drilled With Advanced Abrasive Slurry Jet Technology To Efficiently Exploit Enhanced Geothermal Systems Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Microhole Arrays Drilled With Advanced Abrasive Slurry Jet Technology To Efficiently Exploit Enhanced Geothermal Systems Project Type / Topic 1 Recovery Act: Enhanced Geothermal Systems Component Research and Development/Analysis Project Type / Topic 2 Drilling Systems Project Description This project proposes to develop a cost-effective microhole drilling and completion technology with the Flash Abrasive Slurry Jet (ASJ) system and optimize it to maximize the efficiency of fluid circulation and heat removal for Enhanced Geothermal Systems (EGS). The proposed approach is expected to address the key obstacles that currently prevent EGS from becoming a technically feasible, commercially viable major contributor for electricity generation, namely: (1) reduce costs for drilling and well completion and (2) increase the volume of hot rock from which heat can be extracted.

495

Design and Performance of the ARIANNA Hexagonal Radio Array Systems  

E-Print Network (OSTI)

We report on the development, installation and operation of the first three of seven stations deployed at the ARIANNA site's pilot Hexagonal Radio Array in Antarctica. The primary goal of the ARIANNA project is to observe ultra-high energy (>100 PeV) cosmogenic neutrino signatures using a large array of autonomous stations each dispersed 1 km apart on the surface of the Ross Ice Shelf. Sensing radio emissions of 100 MHz to 1 GHz, each station in the array contains RF antennas, amplifiers, 1.92 G-sample/s, 850 MHz bandwidth signal acquisition circuitry, pattern-matching trigger capabilities, an embedded CPU, 32 GB of solid-state data storage, and long-distance wireless and satellite communications. Power is provided by the sun and LiFePO4 storage batteries, and the stations consume an average of 7W of power. Operation on solar power has resulted in >=58% per calendar-year live-time. The station's pattern-trigger capabilities reduce the trigger rates to a few milli-Hertz with 4-sigma thresholds while retaining ...

Barwick, S W; Besson, D Z; Cheim, E; Duffin, T; Hanson, J C; Klein, S R; Kleinfelder, S A; Prakash, T; Piasecki, M; Ratzlaff, K; Reed, C; Roumi, M; Samanta, A; Stezelberger, T; Tatar, J; Walker, J; Young, R; Zou, L

2014-01-01T23:59:59.000Z

496

Method and system for homogenizing diode laser pump arrays  

DOE Patents (OSTI)

An optical amplifier system includes a diode pump array including a plurality of semiconductor diode laser bars disposed in an array configuration and characterized by a periodic distance between adjacent semiconductor diode laser bars. The periodic distance is measured in a first direction perpendicular to each of the plurality of semiconductor diode laser bars. The diode pump array provides a pump output propagating along an optical path and characterized by a first intensity profile measured as a function of the first direction and having a variation greater than 10%. The optical amplifier system also includes a diffractive optic disposed along the optical path. The diffractive optic includes a photo-thermo-refractive glass member. The optical amplifier system further includes an amplifier slab having an input face and position along the optical path and separated from the diffractive optic by a predetermined distance. A second intensity profile measured at the input face of the amplifier slab as a function of the first direction has a variation less than 10%.

Bayramian, Andy J

2013-10-01T23:59:59.000Z

497

Square Kilometre Array key science: a progressive retrospective  

E-Print Network (OSTI)

I summarize the science drivers presented at the workshop for Phase I of the Square Kilometre Array: 'Advancing Astrophysics with the Square Kilometre Array'. I build from the historical perspective of the original Key Science programs: 'Science with a Square Kilometre Array', and consider progress in astrophysics since 2004. I then present my 'score card' of the primary science drivers proposed by the Science Working Groups, and further developed in the white papers and presentations at the meeting, assuming a conservative high frequency of 3GHz. The science case for the SKA phase I is compelling, with the right mix of killer applications (eg. pulsars and gravity, 21cm cosmology), foundational radio astronomy (eg. cosmic magnetism, baryon cycle, high energy phenomena), and high risk-high return 'game-changing' programs (eg. fast radio bursts, BAO intensity mapping, SETI). A strong case was made at the conference for band 5 (4 to 15GHz), in particular in the area of planet formation and exobiology. Such a cap...

Carilli, Christopher L

2014-01-01T23:59:59.000Z

498

The next generation Cherenkov Telescope Array observatory: CTA  

E-Print Network (OSTI)

The Cherenkov Telescope Array (CTA) is a large collaborative effort aimed at the design and operation of an observatory dedicated to the VHE gamma-ray astrophysics in the energy range 30 GeV-100 TeV, which will improve by about one order of magnitude the sensitivity with respect to the current major arrays (H.E.S.S., MAGIC, and VERITAS). In order to achieve such improved performance, for both the northern and southern CTA sites, four units of 23m diameter Large Size Telescopes (LSTs) will be deployed close to the centre of the array with telescopes separated by about 100m. A larger number (about 25 units) of 12m Medium Size Telescopes (MSTs, separated by about 150m), will cover a larger area. The southern site will also include up to 24 Schwarzschild-Couder dual-mirror medium-size Telescopes (SCTs) with the primary mirror diameter of 9.5m. Above a few TeV, the Cherenkov light intensity is such that showers can be detected even well outside the light pool by telescopes significantly smaller than the MSTs. To a...

Vercellone, Stefano

2014-01-01T23:59:59.000Z

499

Automated inspection of surface breaking cracks using GMR sensor arrays  

SciTech Connect

We present a prototype for automated magnetic stray field testing of ferromagnetic roller bearings. For this purpose NDE-adapted GMR sensor arrays (giant magneto resistance) are used for the detection of surface breaking cracks. The sensors are miniaturized down to the lower ?m-regime to achieve adequate spatial resolution. In doing so, sensor arrays with up to 48 elements are used to inspect the bearing surface within a few seconds only. In contrast to magnetic particle inspection (MPI), where the global magnetization requires a further inspection step and succeeding demagnetization, the presented prototype only locally magnetize the surface area in the vicinity of the GMR Sensors. For the local magnetization, the applied sub-surface magnetic field was simulated and proofed for detecting flaws with a depth of a few 10 ?m. By multiplexing the sensor array with an adapted read out electronics we quasi simultaneously detect the normal field component of about 100?m above the surface. The detection of artificial notches with a depth of 40 ?m and more could be resolved with a SNR better than 20 dB. The presented testing facility is fast and provides a step towards automated testing of safety relevant steel components.

Pelkner, Matthias; Reimund, Verena; Erthner, Thomas; Panke, Nicolai; Kreutzbruck, Marc [BAM Federal Institute for Material Research and Testing, Unter den Eichen 87, 12205 Berlin (Germany)

2014-02-18T23:59:59.000Z

500

A knife-edge array field emission cathode  

SciTech Connect

many cathode applications require a new type of cathode that is able to produce short pulsed electron beams at high emission current. Gated field emitter arrays of micrometer size are recognized as candidates to meet this need and have become the research focus of vacuum microelectronics. Existing fabrication methods produce emitters that are limited either in frequency response or in current emission. One reason is that the structure of these emitters are not sufficiently optimized. In this study, the author investigated the factors that affect the performance of field emitters. An optimum emitter structure, the knife-edge field emitter array, was developed from the analysis. Large field enhancement factor, large effective emission area, and small emitter capacitance are the advantages of the structure. The author next explored various options of fabricating the knife-edge emitter structure. He proposed a unique thin film process procedure and developed the fabrication techniques to build the emitters on (110) silicon wafers. Data from the initial cathode tests showed very low onset voltages and Fowler-Nordheim type emission. Emission simulation based on the fabricated emitter structure indicated that the knife-edge emitter arrays have the potential to produce high performance in modulation frequency and current emission. Several fabrication issues that await further development are discussed and possible solutions are suggested.

Lee, B.

1994-08-01T23:59:59.000Z