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Note: This page contains sample records for the topic "gold antennas metasurface" 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

A discussion on the interpretation and characterization of metafilms/metasurfaces: the two-dimensional equivalent of metamaterials  

Science Conference Proceedings (OSTI)

A metafilm (also referred to as a metasurface) is the surface equivalent of a metamaterial. More precisely, a metafilm is a surface distribution of suitable chosen electrically small scatterers. Metafilms are becoming popular as an alternative to full three-dimensional metamaterials. Unfortunately, many papers in the literature present incorrect interpretations and mischaracterizations of these metafilms. In fact, some of the characterizations presented in the literature result in non-unique parameters for a uniquely defined metafilm. In this paper we discuss an appropriate interpretation and characterization of metafilms and present a correct manner to characterize a metafilm. Additionally, we illustrate the error that results from an incorrect characterization of metafilms. We present various examples to emphasize these points. Finally we present a retrieval approach for determining the uniquely defined quantities (the electric and magnetic susceptibilities of its constituent scatterers) that characterize a metafilm.

O'hara, John F [Los Alamos National Laboratory; Azad, Abul K [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

2

Wideband active antenna cancellation  

E-Print Network (OSTI)

There exists a simultaneous transmit and receive antenna system where the transmitted signal is creating wideband interference of the receiver. To resolve this interference problem, the isolation between the transmit antenna ...

Adaniya, Hana L

2008-01-01T23:59:59.000Z

3

BTRIC - LEED Gold  

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

MAXLAB certified LEED Gold MAXLAB MAXLAB, or Maximum Building Energy Efficiency Research Laboratory, ORNL's newest research facility, attained LEED gold status recently. LEED is a...

4

Antenna structure with distributed strip  

DOE Patents (OSTI)

An antenna comprises electrical conductors arranged to form a radiating element including a folded line configuration and a distributed strip configuration, where the radiating element is in proximity to a ground conductor. The folded line and the distributed strip can be electrically interconnected and substantially coplanar. The ground conductor can be spaced from, and coplanar to, the radiating element, or can alternatively lie in a plane set at an angle to the radiating element. Embodiments of the antenna include conductor patterns formed on a printed wiring board, having a ground plane, spacedly adjacent to and coplanar with the radiating element. Other embodiments of the antenna comprise a ground plane and radiating element on opposed sides of a printed wiring board. Other embodiments of the antenna comprise conductors that can be arranged as free standing "foils". Other embodiments include antennas that are encapsulated into a package containing the antenna.

Rodenbeck, Christopher T. (Albuquerque, NM)

2008-10-21T23:59:59.000Z

5

Antenna structure with distributed strip  

DOE Patents (OSTI)

An antenna comprises electrical conductors arranged to form a radiating element including a folded line configuration and a distributed strip configuration, where the radiating element is in proximity to a ground conductor. The folded line and the distributed strip can be electrically interconnected and substantially coplanar. The ground conductor can be spaced from, and coplanar to, the radiating element, or can alternatively lie in a plane set at an angle to the radiating element. Embodiments of the antenna include conductor patterns formed on a printed wiring board, having a ground plane, spacedly adjacent to and coplanar with the radiating element. Other embodiments of the antenna comprise a ground plane and radiating element on opposed sides of a printed wiring board. Other embodiments of the antenna comprise conductors that can be arranged as free standing "foils". Other embodiments include antennas that are encapsulated into a package containing the antenna.

Rodenbeck, Christopher T. (Albuquerque, NM)

2008-03-18T23:59:59.000Z

6

Efficient Placement of Directional Antennas  

SciTech Connect

Directional antenna is an technology for the proliferation of wireless networks. In centralized wireless network, wireless devices communicate through base stations. Directed antennas are placed on base stations and form a backbone of communication. The communication between base stations and wireless devices can be interfered due to a large number of wireless device. Methodically positioning and orienting directed antennas can help to reduce the interference while saving energy. An integer linear programming is developed for siting and directing antennas on multiple base stations, and this formulation can be extended to model non-overlapping channels. Through the integer programming formulation, optimal antenna positions can be used to analyze the performance of directed antennas with different parameters like the number base stations and the number of non-overlapping channels.

Pan, Feng [Los Alamos National Laboratory; Kasiviswanathan, Shiva [Los Alamos National Laboratory

2010-09-20T23:59:59.000Z

7

Fluidised Bed Technology for Gold Ore and Gold Concentrate  

Science Conference Proceedings (OSTI)

Presentation Title, Fluidised Bed Technology for Gold Ore and Gold Concentrate. Author(s) ... such as the circulating fluidised bed and the bubbling fluidized bed.

8

Going green earns Laboratory gold  

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

Going green earns Laboratory gold Going green earns Laboratory gold The Laboratory's newest facility is its first to achieve both the Leadership in Energy and Environmental Design...

9

Integrated resonant tunneling diode based antenna  

DOE Patents (OSTI)

An antenna comprising a plurality of negative resistance devices and a method for making same comprising employing a removable standoff layer to form the gap between the microstrip antenna metal and the bottom contact layer.

Hietala, Vincent M. (Placitas, NM); Tiggers, Chris P. (Albuquerque, NM); Plut, Thomas A. (Albuquerque, NM)

2000-01-01T23:59:59.000Z

10

Insulated dipole antennas for heating oil shale  

Science Conference Proceedings (OSTI)

Insulated dipole antennas in the HF band are potentially useful in heating shale i n s i t u to extract oil. To help evaluate the efficiency of such antennas

John P. Casey; Rajeev Bansal

1987-01-01T23:59:59.000Z

11

Nested-cone transformer antenna  

DOE Patents (OSTI)

A plurality of conical transmission lines are concentrically nested to form an output antenna for pulsed-power, radio-frequency, and microwave sources. The diverging conical conductors enable a high power input density across a bulk dielectric to be reduced below a breakdown power density at the antenna interface with the transmitting medium. The plurality of cones maintain a spacing between conductors which minimizes the generation of high order modes between the conductors. Further, the power input feeds are isolated at the input while enabling the output electromagnetic waves to add at the transmission interface. Thus, very large power signals from a pulse rf, or microwave source can be radiated. 6 figures.

Ekdahl, C.A.

1991-05-28T23:59:59.000Z

12

Nested-cone transformer antenna  

DOE Patents (OSTI)

A plurality of conical transmission lines are concentrically nested to form n output antenna for pulsed-power, radio-frequency, and microwave sources. The diverging conical conductors enable a high power input density across a bulk dielectric to be reduced below a breakdown power density at the antenna interface with the transmitting medium. The plurality of cones maintain a spacing between conductors which minimizes the generation of high order modes between the conductors. Further, the power input feeds are isolated at the input while enabling the output electromagnetic waves to add at the transmission interface. Thus, very large power signals from a pulse rf, or microwave source can be radiated.

Ekdahl, Carl A. (Santa Fe, NM)

1991-01-01T23:59:59.000Z

13

Nested-cone transformer antenna  

DOE Patents (OSTI)

A plurality of conical transmission lines are concentrically nested to form an output antenna for pulsed-power, radio-frequency, and microwave sources. The diverging conical conductors enable a high power input density across a bulk dielectric to be reduced below a breakdown power density at the antenna interface with the transmitting medium. The plurality of cones maintain a spacing between conductors which minimizes the generation of high order modes between the conductors. Further, the power input feeds are isolated at the input while enabling the output electromagnetic waves to add at the transmission interface. Thus, very large power signals from a pulse rf, or microwave source can be radiated. 6 figs.

Ekdahl, C.A.

1989-10-18T23:59:59.000Z

14

It's Elemental - The Element Gold  

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

Platinum Platinum Previous Element (Platinum) The Periodic Table of Elements Next Element (Mercury) Mercury The Element Gold [Click for Isotope Data] 79 Au Gold 196.966569 Atomic Number: 79 Atomic Weight: 196.966569 Melting Point: 1337.33 K (1064.18°C or 1947.52°F) Boiling Point: 3129 K (2856°C or 5173°F) Density: 19.282 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 6 Group Number: 11 Group Name: none What's in a name? From the Sanskrit word Jval and the Anglo-Saxon word gold. Gold's chemical symbol comes from the the latin word for gold, aurum. Say what? Gold is pronounced as GOLD. History and Uses: An attractive and highly valued metal, gold has been known for at least 5500 years. Gold is sometimes found free in nature but it is usually found

15

Biomolecular Assembly of Gold Nanocrystals  

E-Print Network (OSTI)

water-soluble silica-coated CdSe/ZnS semiconductor quantumEnhanced luminescence of CdSe quantum dots on gold colloids.work with gold and DNA. CdSe/ZnS core-shell nanocrystals

Micheel, Christine Marya

2005-01-01T23:59:59.000Z

16

Adjoint sensitivity analysis of an ultrawideband antenna  

SciTech Connect

The frequency domain finite element method using H(curl)-conforming finite elements is a robust technique for full-wave analysis of antennas. As computers become more powerful, it is becoming feasible to not only predict antenna performance, but also to compute sensitivity of antenna performance with respect to multiple parameters. This sensitivity information can then be used for optimization of the design or specification of manufacturing tolerances. In this paper we review the Adjoint Method for sensitivity calculation, and apply it to the problem of optimizing a Ultrawideband antenna.

Stephanson, M B; White, D A

2011-07-28T23:59:59.000Z

17

The New Gold Standard: Environmental Management Introduces the...  

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

The New Gold Standard: Environmental Management Introduces the First LEED Gold Industrial Facility The New Gold Standard: Environmental Management Introduces the First LEED Gold...

18

Gold Nanoparticles by Alfalfa Plants  

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

Jorge Gardea-Torresdey, University of Texas at El Paso Jorge Gardea-Torresdey, University of Texas at El Paso In the well-known Greek legend the touch of King Midas would convert anything to metallic gold. Recently, a team working at SSRL lead by Professor Jorge Gardea-Torresdey from the University of Texas at El Paso have shown that ordinary alfalfa plants can accumulate very small particles (nanoparticles) of metallic gold (1). The best-known materials that contain nanoparticles of metallic gold are gold colloids. These lack the familiar metallic luster, but show bright colors which range from red, violet or blue, depending upon the size of the nanoparticles (2,3). Colloidal gold has traditionally been used to color materials such as glass (e.g. gold ruby glass and cranberry glass) and enamels (e.g. famille rose enamels) since the 16th century. The earliest report of a colloidal gold preparation may be in the Bible. The book of Exodus reports that Moses destroyed the golden calf in a manner that may have resulted in an aqueous (water-based) gold colloid, which he then forced the Israelites to drink. In modern times gold colloids are imbibed for a variety of ailments (despite little or no evidence of any health-related benefits), but the most important applications may be in the field of nano-technology (see 1, and refs therein).

19

Antenna organization in green photosynthetic bacteria  

DOE Green Energy (OSTI)

This project is concerned with the structure and function of the unique antenna system found in the green photosynthetic bacteria. The antenna system in these organisms is contained within a vesicle known as a chlorosome, which is attached to the cytoplasmic side of the cell membrane. Additional antenna pigments and reaction centers are contained in integral membrane proteins. Energy absorbed by the bacteriochlorophyll c (BChl c) pigments in the chlorosome is transferred via a baseplate'' array of BChl a antenna pigments into the membrane and to the reaction center. A schematic model of chlorosome structure is shown. This project is aimed at increasing our understanding of the organization of the pigments in the chlorosome and how the antenna system functions.

Blankenship, R.E.

1987-01-01T23:59:59.000Z

20

BlackGold Biofuels | Open Energy Information  

Open Energy Info (EERE)

BlackGold Biofuels Jump to: navigation, search Name BlackGold Biofuels Place Philadelphia, Pennsylvania Zip 19107 Product Philadelphia-based developer of a waste...

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Antibody-gold cluster conjugates  

DOE Patents (OSTI)

Antibody- or antibody fragment-gold cluster conjugates are shown wherein the conjugate size can be about 5.0 nm. Methods and reagents are disclosed in which antibodies or Fab' fragments thereof are covalently bound to a stable cluster of gold atoms. 2 figs.

Hainfeld, J.F.

1988-06-28T23:59:59.000Z

22

Narrow focus ultra-wideband antenna for breast cancer detection  

Science Conference Proceedings (OSTI)

A narrow focus ultra-wideband dielectric-filled antenna has been designed for the purpose of near-field breast cancer detection without the use of coupling media. Instead of immersing the antenna in a lossy liquid coupling medium, direct matching of ... Keywords: antenna feeds, antennas, breast cancer detection, directional, radar-based imaging, ultra-wide band

Daniel M. Hailu; Safieddin Safavi-Naeini

2009-01-01T23:59:59.000Z

23

Going green earns Laboratory gold  

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

Going green earns Laboratory gold Going green earns Laboratory gold Going green earns Laboratory gold The Laboratory's newest facility is its first to achieve both the Leadership in Energy and Environmental Design status and Gold certification from the U.S. Green Building Council. June 18, 2012 LANL Green Building Radiological Laboratory Utility Office Building Contact Environmental Communication & Public Involvement P.O. Box 1663 MS M996 Los Alamos, NM 87545 (505) 667-0216 Email "RLUOB's LEED certification demonstrates tremendous leadership in green building...serves as a prime example of just how much we can accomplish." High performance sustainable building attains LEED Gold certification From its robust design to its advanced scientific equipment, the Radiological Laboratory Utility Office Building (RLUOB) is essential to the

24

Detection of electromagnetic waves using MEMS antennas  

SciTech Connect

We describe the design, fabrication and characterization of simple micromechanical structures that are capable of sensing static electric time varying electromagnetic fields. Time varying electric field sensing is usually achieved using an electromagnetic antenna and a receiver. However, these antenna-based approaches do not exhibit high sensitivity over a broad frequency (or wavelength) range. An important aspect of the present work is that, in contrast to traditional antennas, the dimensions of these micromechanical oscillators can be much smaller than the wavelength of the electromagnetic wave. We characterized the fabricated micromechanical oscillators by measuring their responses to time varying electric and electromagnetic fields.

Lavrik, Nickolay V [ORNL; Tobin, [Oak Ridge National Laboratory (ORNL); Bowland, Landon T [ORNL

2011-01-01T23:59:59.000Z

25

High Directive Antenna with Virtual Aperture  

E-Print Network (OSTI)

In this article, we propose a spherical shell-core structure which is able to achieve arbitrarily large directivity. The structure is obtained from coordinate transformation. A small antenna can be projected to free space ...

Zhang, Baile

26

Influence of a Radome on Antenna Performance  

Science Conference Proceedings (OSTI)

The German Meteorological Service [Deutscher Wetterdienst (DWD)] operates the German weather radar network and is currently replacing all radar systems with new dual-polarization radars. One of the key components of a radar system is its antenna. ...

Michael Frech; Bertram Lange; Theo Mammen; Joerg Seltmann; Chris Morehead; Joshua Rowan

2013-02-01T23:59:59.000Z

27

Gold Preg-Robbing by Silicates in Chloride Media  

Science Conference Proceedings (OSTI)

Evolution of Gold Gravity Recovery in Grinding Circuits - A Critical Review ... Selective Separations of Gold and Contaminants from Various Gold and Silver...

28

Comparing Refractory Gold Ore Pre-Oxidation and Crushing ...  

Science Conference Proceedings (OSTI)

Evolution of Gold Gravity Recovery in Grinding Circuits - A Critical Review ... Selective Separations of Gold and Contaminants from Various Gold and Silver...

29

Evolution of Gold Gravity Recovery in Grinding Circuits - A Critical ...  

Science Conference Proceedings (OSTI)

Presentation Title, Evolution of Gold Gravity Recovery in Grinding Circuits - A Critical .... Selective Separations of Gold and Contaminants from Various Gold and...

30

Cyanide Leaching of Gold-Copper Porphyries: Chemistry and ...  

Science Conference Proceedings (OSTI)

Porphyry ores are frequently a source of low-grade gold ore, but gold in these ... Assessment of Acid Rock Drainage and Metal Leaching Risks at Barrick Gold...

31

Radar antenna pointing for optimized signal to noise ratio.  

Science Conference Proceedings (OSTI)

The Signal-to-Noise Ratio (SNR) of a radar echo signal will vary across a range swath, due to spherical wavefront spreading, atmospheric attenuation, and antenna beam illumination. The antenna beam illumination will depend on antenna pointing. Calculations of geometry are complicated by the curved earth, and atmospheric refraction. This report investigates optimizing antenna pointing to maximize the minimum SNR across the range swath.

Doerry, Armin Walter; Marquette, Brandeis [General Atomics Aeronautical Systems, Inc., San Diego, CA

2013-01-01T23:59:59.000Z

32

Rosebel Gold Mine, Suriname, Guiana Shield - Programmaster.org  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, COM 2011. Symposium, WORLD GOLD. Presentation Title, Structural Characterization of Orogenic Gold Deposits. A Case Study:...

33

Control of blood clotting using gold nanorods  

E-Print Network (OSTI)

We have developed a method to externally control blood clotting using gold nanoparticles. Gold nanorods (NRs) have unique size and shape-dependent optical properties that can be used for externally controlled release of ...

De Puig Guix, Helena

2013-01-01T23:59:59.000Z

34

Determining Weather Radar Antenna Pointing Using Signals Detected from the Sun at Low Antenna Elevations  

Science Conference Proceedings (OSTI)

A method to determine the elevation and azimuth biases of the radar antenna using solar signals observed by a scanning radar is presented. Data recorded at low elevation angles where the atmospheric refraction has a significant effect on the ...

Asko Huuskonen; Iwan Holleman

2007-03-01T23:59:59.000Z

35

Surface Characterization of Conjugated Gold Nanoparticles  

Science Conference Proceedings (OSTI)

... planar gold. Relative percentage coverages determined for the dendron modified NP samples are listed in Table 1. This ...

2012-11-16T23:59:59.000Z

36

New Gold Nanoparticle RMs Support Nanotechnology ...  

Science Conference Proceedings (OSTI)

... Various types of nanoparticles (eg, dendrimers, quantum dots, gold nanospheres ... by a lack of comprehensive and accurate physical and chemical ...

2012-10-02T23:59:59.000Z

37

Low cost impulse compatible wideband antenna  

DOE Patents (OSTI)

An antenna apparatus and method for building the antenna is disclosed. Impulse signals travel through a feed point of the antenna with respect to a ground plane. A geometric fin structure is connected to the feed point, and through a termination resistance to the ground plane. A geometric ridge structure connected to the ground is positioned with respect to the fin in order to receive and radiate electromagnetic energy from the impulse signal at a predetermined impedance and over a predetermined set of frequencies. The fin and ridge can be either a wire or a planar surface. The fin and ridge may be disposed within a radiation cavity such as a horn. The radiation cavity is constructed of stamped and etched metal sheets bent and then soldered together. The fin and ridge are also formed from metal sheets or wires. The fin is attached to the feed point and then to the cavity through a termination resistance. The ridge is attached to the cavity and disposed with respect to the fin in order to achieve a particular set of antenna characteristics.

Rosenbury, Erwin T. (Livermore, CA); Burke, Gerald J. (Livermore, CA); Nelson, Scott D. (Tracy, CA); Stever, Robert D. (Lathrop, CA); Governo, George K. (Livermore, CA); Mullenhoff, Donald J. (Livermore, CA)

2002-01-01T23:59:59.000Z

38

Simulating devices with adaptive antenna arrays using OPNET integrated with MATLAB  

Science Conference Proceedings (OSTI)

In this paper we present a way to use adaptive antenna arrays in OPNET (Optimized Network Evaluation Tool) simulations. Adaptive antenna patterns, which are not supported by OPNET directly, can be implemented by interfacing OPNET with MATLAB, which performs ... Keywords: adaptive antennas, antenna array, matlab, opnet, smart antennas

Jaakko M. Seppl; Timo Brysy; Pekka Lilja

2009-10-01T23:59:59.000Z

39

New Concepts For High Power ICRF Antennas  

Science Conference Proceedings (OSTI)

This paper presents new concepts for Ion Cyclotron Heating antennas based on cascaded sequences of tuned radiating structures. It is shown that, in large arrays, such as the ones proposed for fusion reactors applications, these schemes offer, in principle, a number of desirable features, such as operation at power density significantly higher than currently adopted systems, at equal maximum voltage and array geometry, simple mechanical layout, suitable for water cooling, a compact impedance tuning system, passive decoupling of the array elements, single ended or balanced feed from two power sources. The antenna layout also allows the remote, real time measurement of the complex impedance of the radiating elements and the detection, location, and measurement of the complex admittance of arcs occurring anywhere in the structure, as discussed in [1].

Bosia, G. [Department of Physics University of Turin (Italy)

2011-12-23T23:59:59.000Z

40

Construction of artificial pigment-protein antennae  

DOE Green Energy (OSTI)

Photosynthesis is a complex process which results in the conversion of solar radiation into chemical energy. This chemical energy is then used as the free energy source for all living organisms. In its basic form, photosynthesis can be described as the light-activated synthesis of carbohydrates from the simple molecules of water and carbon dioxide: 6H{sub 2}O + 6 CO{sub 2} light C{sub 6}H{sub 12}O{sub 6} + 6 O{sub 2} This basic mechanism actually requires numerous reaction steps. The two primary steps being: the capture of light by pigment molecules in light-harvesting antenna complexes and the transfer of this captured energy to the so-called photochemical reaction center. While the preferred pathway for energy absorbed by the chromophores in the antenna complexes is transfer to the reaction center, energy can be lost to competing processes such as internal conversion or radiative decay. Therefore, the energy transfer must be rapid, typically on the order of picoseconds, to successfully compete. The focus of the present work is on the construction of light-harvesting antenna complexes incorporating modular pigment-proteins.

Sibbald, J.

1997-01-10T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Antenna with distributed strip and integrated electronic components  

DOE Patents (OSTI)

An antenna comprises electrical conductors arranged to form a radiating element including a folded line configuration and a distributed strip configuration, where the radiating element can be in proximity to a ground conductor and/or arranged as a dipole. Embodiments of the antenna include conductor patterns formed on a printed wiring board, having a ground plane, spacedly adjacent to and coplanar with the radiating element. An antenna can comprise a distributed strip patterned on a printed wiring board, integrated with electronic components mounted on top of or below the distributed strip, and substantially within the extents of the distributed strip. Mounting of electronic components on top of or below the distributed strip has little effect on the performance of the antenna, and allows for realizing the combination of the antenna and integrated components in a compact form. An embodiment of the invention comprises an antenna including a distributed strip, integrated with a battery mounted on the distributed strip.

Rodenbeck, Christopher T. (Albuquerque, NM); Payne, Jason A. (Albuquerque, NM); Ottesen, Cory W. (Albuquerque, NM)

2008-08-05T23:59:59.000Z

42

Lithographic antennas for enhancement of solar cell efficiency  

DOE Green Energy (OSTI)

This report documents proof-of-concept demonstration of the use of lithographic antennas for enhancement of solar-cell efficiency. A micro-sized lithographic antenna array was theoretically modeled, designed and fabricated. Experimental research was performed to validate the ability of the antenna array to concentrate infrared and visible energy onto photovoltaic (PV) materials. The research will serve as the basis for the design of a miniature power source for remote sensors.

Kotter, D.K. [Lockheed Martin Idaho Technologies Co., Idaho Falls, ID (United States); Boreman, G. [Univ. of Central Florida, Orlando, FL (United States). Center for Research and Education in Optics and Lasers

1998-04-01T23:59:59.000Z

43

Development of impedance matching technologies for ICRF antenna arrays  

SciTech Connect

All high power ICRF heating systems include devices for matching the input impedance of the antenna array to the generator output impedance. For most types of antennas used, the input impedance is strongly time-dependent on timescales as rapid as 10-4 s, while the rf generators used are capable of producing full power only into a stationary load impedance. Hence, the dynamic response of the matching method is of great practical importance. In this paper, world-wide developments in this field over the past decade are reviewed. These techniques may be divided into several classes. The edge plasma parameters that determine the antenna array`s input impedance may be controlled to maintain a fixed load impedance. The frequency of the rf source can be feedback controlled to compensate for changes in the edge plasma conditions, or fast variable tuning elements in the transmission line between the generator output and the antenna input connections can provide the necessary time-varying impedance transformation. In lossy passive schemes, reflected power due to the time-varying impedance of the antenna array is diverted to a dummy load. Each of these techniques can be applied to a pre-existing antenna system. If a new antenna is to be designed, recent advances allow the antenna array to have the intrinsic property of presenting a constant load to the feeding transmission lines despite the varying load seen by each antenna in the array.

Pinsker, R.I.

1998-03-01T23:59:59.000Z

44

Graphene Antennas: Can Integration and Reconfigurability Compensate for the Loss?  

E-Print Network (OSTI)

In this opening presentation we will first recall the main characteristics of graphene conductivity and electromagnetic wave propagation on graphene-based structures. Based on these observations and different graphene antenna simulations from microwave to Terahertz, we will discuss the issue of antenna efficiency, integration and reconfigurability, as function of the operation frequency range. While the applicability of graphene for antennas at microwave appears limited to particular cases where very low efficiency can be tolerated for integration or transparency purpose, the plasmonic nature of graphene conductivity at terahertz frequency allows unprecedented antenna properties and in particular efficient dynamic reconfiguration.

Perruisseau-Carrier, Julien; Gomez-Diaz, Juan Sebastian; Carrasco, Eduardo

2013-01-01T23:59:59.000Z

45

Functionalized Gold Nanoparticles for Rapid, Ultra- sensitive ...  

and Ocean Optics) Patent Baohua Gu. Functionalized Gold Surface-Enhanced Raman Scattering Substrate for Rapid and Ultra-Sensitive Detection of Anionic Species

46

Gravity Gold Concentration at Newmont Mining  

Science Conference Proceedings (OSTI)

Abstract Scope, The process of gold recovery by gravity concentration is incorporated ... Energy Management Planning, Following the ISO 50001 Draft Standard.

47

Optimising Circuit Design for Gravity Gold Recovery  

Science Conference Proceedings (OSTI)

Abstract Scope, To determine the optimal circuit configuration for gravity gold recovery ... Energy Management Planning, Following the ISO 50001 Draft Standard.

48

BPA Headquarters Now Gold Certified for Sustainability  

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

BPA recently became the first federal agency in Portland, Oregon, to achieve the city's Sustainability at Work Gold Certification for sustainability efforts at its headquarters building.

49

High Strength Gold Wire for Microelectronics Miniaturization ...  

ISU and Ames Laboratory researchers have developed a high strength gold wire for use in microelectronics that can maintain its electrical and mechanical properties ...

50

LLNL Supercomputing Facility Achieves LEED Gold  

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

Alison Terrill, ArchitectLEED AP Jennifer Doman, Pollution PreventionSustainability Program LLNL Supercomputing Facility Achieves LEED Gold This work performed under...

51

Beam spoiling a reflector antenna with conducting shim.  

SciTech Connect

A horn-fed dish reflector antenna has characteristics including beam pattern that are a function of its mechanical form. The beam pattern can be altered by changing the mechanical configuration of the antenna. One way to do this is with a reflecting insert or shim added to the face of the original dish.

Doerry, Armin Walter

2012-12-01T23:59:59.000Z

52

Hydrocyclone Classification Modeling for Gold Ore Grinding Circuit ...  

Science Conference Proceedings (OSTI)

Grinding is achieved in closed circuits where hydrocyclones are used to .... Selective Separations of Gold and Contaminants from Various Gold and Silver...

53

Implementation Update Black and Gold Commission  

E-Print Network (OSTI)

Implementation Update Black and Gold Commission June, 2003 1 Action Item/ Major Initiative Outcomes Policies and Practices of UWM with principles and goals of Black & Gold Commission UWM culture supports Senate; Student Association; Classified Employee Groups; Deans & Division Heads Spirit of the Black

Saldin, Dilano

54

The design of high-power ICRF antennas for TFTR and Tore Supra  

SciTech Connect

The Oak Ridge National Laboratory is designing, fabricating, and testing antennas for TFTR and Tore Supra. The antennas will deliver 4 MW per port to the hot plasma. The antennas' designs are nearly complete; they are backed by the results of extensive modeling, analyses, and tests of the electrical, thermal, and structural characteristics of the antennas that were carried out during the design process.

Hoffman, D.J.; Baity, F.W.; Bryan, W.E.; Chen, G.L.; Luk, K.H.; Owens, T.L.; Ray, J.M.; Ryan, P.M.; Swain, D.W.; Walls, J.C.

1987-01-01T23:59:59.000Z

55

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

DOE Patents (OSTI)

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

56

A Novel CPW Fed Multiband Circular Microstrip Patch Antenna for Wireless Applications  

Science Conference Proceedings (OSTI)

In this paper, a novel design of coplanar micro strip patch antenna is presented for ultra wideband (UWB) and smart grid applications. It is designed on a dielectric substrate and fed by a coplanar wave guide (CPW). Micro strip patch antenna consists ... Keywords: Smart Grid, CPW, planar antenna, ultra wideband (UWB) antenna, HFSS

Kirti Vyas; A. K. Sharma; P. K. Singhal

2012-11-01T23:59:59.000Z

57

Method of making radio frequency ion source antenna and such antenna  

DOE Patents (OSTI)

In the method, the radio frequency (rf) antenna is made by providing a clean coil made of copper tubing or other metal conductor, which is coated with a tacky organic binder, and then with a powdered glass frit, as by sprinkling the frit uniformly over the binder. The coil is then heated internally in an inert gas atmosphere, preferably by passing an electrical heating current along the coil. Initially, the coil is internally heated to about 200/sup 0/C to boil off the water from the binder, and then to about 750 to 850/sup 0/C to melt the glass frit, while also burning off the organic binder. The melted frit forms a molten glass coating on the metal coil, which is then cooled to solidify the glass, so that the metal coil is covered with a thin continuous homogeneous impervious glass coating of substantially uniform thickness. The glass coating affords complete electrical insulation and complete dielectric protection for the metal coil of the rf antenna, to withstand voltage breakdown and to prevent sputtering, while also doubling the plasma generating efficiency of the rf antenna, when energized with RF power in the vacuum chamber of an ion source for a particle accelerator or the like. The glass frit preferably contains approximately 45% lead oxide.

Ehlers, K.W.; Leung, K.N.

1985-05-22T23:59:59.000Z

58

Striking Nano Gold | Advanced Photon Source  

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

2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed Striking Nano Gold FEBRUARY 6, 2008 Bookmark and Share X-ray crystal structure of the Au102(p-MBA)44...

59

FISSION OF GOLD BY CARBON IONS  

E-Print Network (OSTI)

private communication. The fission-barrier calculations arein the systematics of spontaneous-fission half lives, W. J.1955). H. Marshall Blann, Fission of Gold with 112-Mev C

Gordon, Glen E.; Larsh, Almon E.; Sikkeland, Torbjorn; Seaborg, Glenn T.

2008-01-01T23:59:59.000Z

60

ARM - Evaluation Product - Corrected Moments in Antenna Coordinates  

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

ProductsCorrected Moments in Antenna Coordinates ProductsCorrected Moments in Antenna Coordinates Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Evaluation Product : Corrected Moments in Antenna Coordinates Site(s) SGP TWP General Description Raw moments from the scanning ARM precipitation radars (SAPRs) are subject to a number of instrumental and atmospheric phenomena that must be retrieved and corrected for. The Corrected Moments in Antenna Coordinates (CMAC) value-added product contains both raw data and fields that have been processed to: · correct for velocity aliasing · unfold and generate a cross-polarimetric phase difference that is monotonically increasing, removing impulses caused by non-uniform beam filling and phase shift on backscatter · recalculate specific differential phase using a 20-point Sobel filter on

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Intelligent antenna sharing in cooperative diversity wireless networks  

E-Print Network (OSTI)

Cooperative diversity has been recently proposed as a way to form virtual antenna arrays that provide dramatic gains in slow fading wireless environments. However, most of the proposed solutions require simultaneous relay ...

Bletsas, Aggelos Anastasiou, 1975-

2005-01-01T23:59:59.000Z

62

The feasibility of on-chip interconnection using antennas  

Science Conference Proceedings (OSTI)

The feasibility of integrating antennas and required circuits to form wireless interconnects in foundry digital CMOS technologies has been demonstrated. The key challenges including the effects of metal structures associated with integrated circuits, ...

K. K. O; K. Kim; B. Floyd; J. Mehta; H. Yoon; C.-M. Hung; D. Bravo; T. Dickson; X. Guo; R. Li; N. Trichy; J. Caserta; W. Bomstad; J. Branch; D.-J. Yang; J. Bohorquez; J. Chen; E.-Y. Seok; L. Gao; A. Sugavanam; J.-J. Lin; S. Yu; C. Cao; M.-H. Hwang; Y.-R. Ding; S.-H. Hwang; H. Wu; N. Zhang; J. E. Brewer

2005-05-01T23:59:59.000Z

63

Surface plasma source with saddle antenna radio frequency plasma generator  

Science Conference Proceedings (OSTI)

A prototype RF H{sup -} surface plasma source (SPS) with saddle (SA) RF antenna is developed which will provide better power efficiency for high pulsed and average current, higher brightness with longer lifetime and higher reliability. Several versions of new plasma generators with small AlN discharge chambers and different antennas and magnetic field configurations were tested in the plasma source test stand. A prototype SA SPS was installed in the Spallation Neutron Source (SNS) ion source test stand with a larger, normal-sized SNS AlN chamber that achieved unanalyzed peak currents of up to 67 mA with an apparent efficiency up to 1.6 mA/kW. Control experiments with H{sup -} beam produced by SNS SPS with internal and external antennas were conducted. A new version of the RF triggering plasma gun has been designed. A saddle antenna SPS with water cooling is fabricated for high duty factor testing.

Dudnikov, V.; Johnson, R. P. [Muons, Inc., Batavia, Illinios 60510 (United States); Murray, S.; Pennisi, T.; Piller, C.; Santana, M.; Stockli, M.; Welton, R. [ORNL, Oak Ridge, Tennessee 37831 (United States)

2012-02-15T23:59:59.000Z

64

Antenna Pattern Analysis and Measurements for Multiparameter Radars  

Science Conference Proceedings (OSTI)

Measuring the full polarization matrix using a research radar requires knowledge of the complex (i.e., amplitude and phase) antenna pattern to properly correct for bias errors in the measurements. However, generally only power patterns are ...

V. Chandrasekar; R. Jeffrey Keeler

1993-10-01T23:59:59.000Z

65

The Differential Phase Pattern of the CSU CHILL Radar Antenna  

Science Conference Proceedings (OSTI)

The measurement of the differential propagation phase and copolar correlation coefficient are affected by the differential phase pattern of the antenna system when operating in an alternate horizontal and vertical transmitting scheme. Direct ...

A. Mudukutore; V. Chandrasekar; E. A. Mueller

1995-10-01T23:59:59.000Z

66

Analysis and Design of a Multifunctional Spiral Antenna  

E-Print Network (OSTI)

The Archimedean spiral antenna is well-known for its broadband characteristics with circular polarization and has been investigated for several decades. Since their development in the late 1950's, establishing an analytical expression for the characteristics of spiral antenna has remained somewhat elusive. This has been studied qualitatively and evaluated using numerical and experimental techniques with some success, but many of these methods are not convenient in the design process since they do not impart any physical insight into the effect each design parameter has on the overall operation of the spiral antenna. This work examines the operation of spiral antennas and obtains a closed-form analytical solution by conformal mapping and transmission line model with high precision in a wide frequency band. Based on the analysis of spiral antenna, we propose two novel design processes for the stripline-fed Archimedean spiral antenna. This includes a stripline feed network integrated into one of the spiral arms and a broadband tapered impedance transformer that is conformal to the spiral topology for impedance matching the nominally-high input impedance of the spiral. A Dyson-style balun located at the center facilitates the transition between guided stripline and radiating spiral modes. Measured and simulated results for a probe-fed design operating from 2 GHz to over 20 GHz are in excellent agreements to illustrate the synthesis and performance of a demonstration antenna. The research in this work also provides the possibility to achieve conformal integration and planar structural multi-functionality for an Unmanned Air Vehicle (UAV) with band coverage across HF, UHF, and VHF. The proposed conformal mapping analysis can also be applied on periodic coplanar waveguides for integrated circuit applications.

Chen, Teng-Kai

2012-08-01T23:59:59.000Z

67

SILVER AND GOLD BASED AUTOMETALLOGRAPHY OF NANOGOLD.  

SciTech Connect

For many applications, silver salt-based autometallography (often also called silver enhancement or silver development) is required to visualize colloidal gold (1-5 nm in diameter) or the small 1.4 nm Nanogold{reg_sign} particles (Nanoprobes, Yaphank, NY, USA). Although even Nanogold may be seen directly by scanning-transmission electron microscopy (STEM), by transmission EM (TEM; in thin sections without stain or ice-embedded cryo-EM samples), energy filtered TEM, and scanning EM (SEM), silver enhancement makes viewing in the EM more facile since the particles are enlarged to approximately 10 to 20 nm, convenient for most specimens. Autometallographic (AMG) enhancement is required in order to visualize smaller gold particles such as Nanogold for light microscopy (LM) or in blots or gels. This chapter includes the following protocols: Protocol for HQ silver enhancement of Nanogold; Protocols for use of silver-enhanced Nanogold with osmium tetroxide--(A) Procedure using reduced concentration of OsO{sub 4}; (B) Procedures for gold toning; Protocol for HQ silver enhancement of Nanogold in pre-embedding immunocytochemistry for cell cultures; Protocol for gold enhancement of Nanogold for EM; Protocol for gold enhancement of Nanogold for LM; Protocol for staining blots with Nanogold and silver enhancement; and Protocol for staining gels with Nanogold and silver enhancement.

HAINFELD,J.F.POWELL,R.D.

2002-04-17T23:59:59.000Z

68

An Approximation to the Effective Beam Weighting Function for Scanning Meteorological Radars with an Axisymmetric Antenna Pattern  

Science Conference Proceedings (OSTI)

To obtain statistically stable reflectivity measurements by meteorological radars, it is common practice to average over several consecutive pulses during which the antenna rotates at a certain angular velocity. Taking into account the antennas ...

Ulrich Blahak

2008-07-01T23:59:59.000Z

69

Gold Country Energy | Open Energy Information  

Open Energy Info (EERE)

Gold Country Energy Gold Country Energy Place Alaska Utility Id 56739 Utility Location Yes Ownership I NERC WECC Yes Operates Generating Plant Yes Activity Generation Yes Activity Transmission Yes References EIA Form EIA-861 Final Data File for 2010 - File2_2010[1] EIA Form EIA-861 Final Data File for 2010 - File1_a[2] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png No rate schedules available. Average Rates Residential: $0.6670/kWh Commercial: $0.6430/kWh References ↑ "EIA Form EIA-861 Final Data File for 2010 - File2_2010" ↑ "EIA Form EIA-861 Final Data File for 2010 - File1_a" Retrieved from "http://en.openei.org/w/index.php?title=Gold_Country_Energy&oldid=412919"

70

Gold Standard Program Model | Open Energy Information  

Open Energy Info (EERE)

Gold Standard Program Model Gold Standard Program Model Jump to: navigation, search Tool Summary Name: Gold Standard Program Model Agency/Company /Organization: World Wildlife Fund Sector: Climate, Energy User Interface: Other Complexity/Ease of Use: Moderate Website: www.cdmgoldstandard.org/project-certification/rules-and-toolkit Cost: Paid Related Tools Environmental Benefits Mapping and Analysis Program (BenMAP) MIT Emissions Prediction and Policy Analysis (EPPA) Model ProForm ... further results Find Another Tool FIND DEVELOPMENT IMPACTS ASSESSMENT TOOLS A bottom-up method of certifying Kyoto Protocol Clean Development Mechanism projects and voluntary programs that result in verifiable co-benefits. Approach It is a bottom up method of certifying Kyoto Protocol Clean Development Mechanism projects as well as voluntary programs that result in verifiable

71

Do Investors Forecast Fat Firms? Evidence from the Gold Mining Industry  

E-Print Network (OSTI)

Economists Gold Price Forecasts, Australian Journal ofDo Investors Forecast Fat Firms? Evidence from the Gold

Borenstein, Severin; Farrell, Joseph

2006-01-01T23:59:59.000Z

72

BioGold Fuels Corporation | Open Energy Information  

Open Energy Info (EERE)

BioGold Fuels Corporation BioGold Fuels Corporation Jump to: navigation, search Name BioGold Fuels Corporation Place Los Angeles, California Zip CA 90067 Product BioGold Fuels Corporation has licensed and/or developed through joint ventures a lower-cost, higher-output system for the production of diesel fuel derived from Municipal Solid Waste ("MSW"). References BioGold Fuels Corporation[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. BioGold Fuels Corporation is a company located in Los Angeles, California . References ↑ "BioGold Fuels Corporation" Retrieved from "http://en.openei.org/w/index.php?title=BioGold_Fuels_Corporation&oldid=342834" Categories:

73

Radiation Response of Nano-scale Gold Foams  

Science Conference Proceedings (OSTI)

Our recent experiments and computer simulations focus on the radiation and mechanical response of nanoporous gold (NPG). Radiation tolerance was...

74

A Segmented Reconciliation Matrix Approach to Monitor Gold ...  

Science Conference Proceedings (OSTI)

... (TOS), developed to monitor gold operations and reserve estimation. ... Application of Standardized Net Carbonate Value Characterization Methods to GARD...

75

Reduced-volume antennas with integrated high-impedance electromagnetic surfaces.  

Science Conference Proceedings (OSTI)

Several antennas with integrated high-impedance surfaces are presented. The high-impedance surface is implemented as a composite right/left-handed (CRLH) metamaterial fabricated from a periodic structure characterized by a substrate, filled with an array of vertical vias and capped by capacitive patches. Omnidirectional antennas placed in close proximity to the high-impedance surface radiate hemispherically with an increase in boresight far-field pattern gain of up to 10 dB and a front-to-back ratio as high as 13 dB at 2.45 GHz. Several TEM rectangular horn antennas are realized by replacing conductor walls with high-impedance surfaces. The TEM horn antennas are capable of operating below the TE{sub 1,0} cutoff frequency of a standard all-metal horn antenna, enabling a reduction in antenna volume. Above the cutoff frequency the TEM horn antennas function similarly to standard rectangular horn antennas.

Forman, Michael A.

2006-11-01T23:59:59.000Z

76

Multi-dimensional ultra-high frequency passive radio frequency identification tag antenna designs  

E-Print Network (OSTI)

In this thesis, we present the design, simulation, and empirical evaluation of two novel multi-dimensional ultra-high frequency (UHF) passive radio frequency identification (RFID) tag antennas, the Albano-Dipole antenna ...

Delichatsios, Stefanie Alkistis

2006-01-01T23:59:59.000Z

77

1 | P a g e Boiler Gold Rush  

E-Print Network (OSTI)

1 | P a g e Boiler Gold Rush VISION STATEMENT The vision of BGR is twofold: first, help all new by participating in the premiere orientation program in the nation, Boiler Gold Rush. Second, enhance upper leaders for the betterment of the university. PROGRAM GOALS Boiler Gold Rush will provide the following

Ginzel, Matthew

78

On the impact of Gold Open Access journals  

Science Conference Proceedings (OSTI)

Gold Open Access (=Open Access publishing) is for many the preferred route to achieve unrestricted and immediate access to research output. However, true Gold Open Access journals are still outnumbered by traditional journals. Moreover availability of ... Keywords: Directory of Open Access journals (DOAJ), Gold Open Access, Impact analysis, Impact evolution, Journal citation reports (JCR), Journal impact factor, Open Access publishing, SJR, SNIP, Ulrichsweb

Christian Gumpenberger; Mara-Antonia Ovalle-Perandones; Juan Gorraiz

2013-07-01T23:59:59.000Z

79

Gold-coated nanoparticles for use in biotechnology applications  

DOE Patents (OSTI)

A process of preparing gold-coated magnetic nanoparticles is disclosed and includes forming a suspension of magnetic nanoparticles within a suitable liquid, adding an amount of a reducible gold compound and a reducing agent to the suspension, and, maintaining the suspension for time sufficient to form gold-coated magnetic nanoparticles.

Berning, Douglas E. (Los Alamos, NM); Kraus, Jr., Robert H. (Los Alamos, NM); Atcher; Robert W. (Los Alamos, NM); Schmidt, Jurgen G. (Los Alamos, NM)

2009-07-07T23:59:59.000Z

80

Terahertz nano antenna enabled early transition in VO2  

E-Print Network (OSTI)

We study terahertz transmission through nano-patterned vanadium dioxide thin film. It is found that the patterning allows the lowering of the apparent transition temperature. For the case of the smallest width nano antennas, the transition temperature is lower by as many as ten degrees relative to the bare film, so that the nano patterned hysteresis curves completely separate themselves from their bare film counterparts. This early transition comes from the one order of magnitude enhanced effective dielectric constants by nano antennas. This phenomenon opens up the possibility of transition temperature engineering.

Jeong, Young-Gyun; Choi, Jae-Wook; Han, Sang-Hoon; Park, Hyeong-Ryeol; Park, Namkyoo; Kim, Bong-Jun; Kim, Hyun-Tak; Kim, Dai-Sik

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Comparison of the Resonant Frequency in Graphene and Metallic Nano-antennas  

E-Print Network (OSTI)

Comparison of the Resonant Frequency in Graphene and Metallic Nano-antennas Ignacio Llatser Barcelona, Spain Theoretical Nano-Photonics Group, Institute of High-Frequency and Communication Technology-based nano-antennas (graphennas) and metallic nano- antennas as a function of their length is analyzed

Politècnica de Catalunya, Universitat

82

Energy harvesting antennas or when is a monopole half of a dipole?  

Science Conference Proceedings (OSTI)

Miniature electronic devices remotely powered by radio frequency energy have become very popular for applications such as radio frequency identification tags. Power is received using a small antenna. Close proximity of antenna, load and related circuitry ... Keywords: antennas, energy harvesting, impedance matching

M. H. Mickle; M. Mi; C. C. Capelli; H. Swift; J. T. Cain; D. W. Sammel

2007-06-01T23:59:59.000Z

83

A low-complexity multiuser detector for asynchronous CDMA QPSK adaptive antenna array systems  

Science Conference Proceedings (OSTI)

This paper proposes a low complexity joint space-time multiuser detection algorithm for asynchronous DS/CDMA antenna array systems. The proposed multiuser detector is composed of an adaptive antenna array, used as a linear beamformer, and a sliding window ... Keywords: adaptive antenna systems, decorrelating detector, direct sequence code division multiple access (DS-CDMA), multiuser detection (MUD)

E. Del Re; R. Fantacci; S. Morosi; S. Marapodi

2003-07-01T23:59:59.000Z

84

Gold and Black Group Paws Training Plans Gold Group Black Group  

E-Print Network (OSTI)

Gold and Black Group Paws Training Plans Gold Group Black Group Week Day Distance Description Day://www.badgerlandstriders.org/home/Races/TheDeerRun.htm. Black Group The goal of the Black Group is to go from moderate running to 13 miles over a ten week include periodic walking breaks as needed. The Black Group should run four days a week on a Monday

Saldin, Dilano

85

Rate Adaptation in MIMO Antenna Selection System with Imperfect CSIT  

E-Print Network (OSTI)

Bhashyam Department of Electrical Engineering, IIT Madras, Chennai - 600 036, India. Email: {ee04d016 of the following reasons: (1) reduced hardware complexity owing to the usage of only one antenna at any point transmission rate is chosen using a lower bound on the conditional mutual information in order to meet a target

Bhashyam, Srikrishna

86

Low Complexity Power Allocation in Multiple-antenna Relay Networks  

E-Print Network (OSTI)

Dept. of Electrical and Computer Engineering Queen's University, Kingston, Ontario, K7L3N6, Canada of research and enables efficient spectrum usage by resource sharing among multiple nodes in a network. Major antenna cooperative system is studied in [3], where the upper and lower bounds for capacity indicate

Blostein, Steven D.

87

On the performances of IEEE 802.16(d) mesh CDS-mode networks using Single-Switched-Beam Antennas  

Science Conference Proceedings (OSTI)

The IEEE 802.16(d) mesh coordinated distributed scheduling (CDS) mode is a novel technology for future fixed wireless backbone networks and designed for the use of omnidirectional antennas. The use of Single-Switched-Beam Antennas (SSBAs) may have great ... Keywords: Coordinated distributed scheduling mode, Directional antenna, IEEE 802.16, Mesh network, Switched-beam antenna

Chih-Che Lin; Shie-Yuan Wang; Teng-Wei Hsu

2012-03-01T23:59:59.000Z

88

Another Gold for PPPL: Laboratory Wins 2nd Gold GreenBuy Award | Princeton  

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

Another Gold for PPPL: Laboratory Wins 2nd Gold GreenBuy Award Another Gold for PPPL: Laboratory Wins 2nd Gold GreenBuy Award By Jeanne Jackson DeVoe September 23, 2013 Tweet Widget Facebook Like Google Plus One Teodora Todorova cleans a restroom with green products like HydroxiPro, which is 100 percent bio-based. The hand soap in PPPL's rest rooms is made mostly of vegetable-based glycerin and aloe. The paper products are made from 70 to 100 percent recycled products and the hand towels are composted at PPPL. Teodora Todorova cleans a restroom with green products like HydroxiPro, which is 100 percent bio-based. The hand soap in PPPL's rest rooms is made mostly of vegetable-based glycerin and aloe. The paper products are made from 70 to 100 percent recycled products and the hand towels are composted at PPPL. PPPL has received a gold GreenBuy award from the U.S. Department of Energy

89

A luminosity model of RHIC gold runs  

SciTech Connect

In this note, we present a luminosity model for RHIC gold runs. The model is applied to the physics fills in 2007 run without cooling, and with the longitudinal cooling applied to one beam only. Having good comparison, the model is used to project a fill with the longitudinal cooling applied to both beams. Further development and possible applications of the model are discussed. To maximize the integrated luminosity, usually the higher beam intensity, smaller longitudinal and transverse emittance, and smaller {beta} are the directions to work on. In past 10 years, the RHIC gold runs have demonstrated a path toward this goal. Most recently, a successful commissioning of the bunched beam stochastic cooling, both longitudinal and transverse, has offered a chance of further RHIC luminosity improvement. With so many factors involved, a luminosity model would be useful to identify and project gains in the machine development. In this article, a preliminary model is proposed. In Section 2, several secondary factors, which are not yet included in the model, are identified based on the RHIC operation condition and experience in current runs. In Section 3, the RHIC beam store parameters used in the model are listed, and validated. In Section 4, the factors included in the model are discussed, and the luminosity model is presented. In Section 5, typical RHIC gold fills without cooling, and with partial cooling are used for comparison with the model. Then a projection of fills with more coolings is shown. In Section 6, further development of the model is discussed.

Zhang, S.Y.

2011-11-01T23:59:59.000Z

90

Nanoporous Au: an unsupported pure gold catalyst?  

Science Conference Proceedings (OSTI)

The unique properties of gold especially in low temperature CO oxidation have been ascribed to a combination of various effects. In particular, particle sizes below a few nm and specific particle-support interactions have been shown to play important roles. On the contrary, recent reports revealed that monolithic nanoporous gold (npAu) prepared by leaching a less noble metal, such as Ag, out of the corresponding alloy can also exhibit remarkably high catalytic activity for CO oxidation, even though no support is present. Therefore, it was claimed to be a pure and unsupported gold catalyst. We investigated npAu with respect to its morphology, surface composition and catalytic properties. In particular, we studied the reaction kinetics for low temperature CO oxidation in detail taking mass transport limitation due to the porous structure of the material into account. Our results reveal that Ag, even if removed almost completely from the bulk, segregates to the surface resulting in surface concentrations of up to 10 at%. Our data suggest that this Ag plays a significant role in activation of molecular oxygen. Therefore, npAu should be considered as a bimetallic catalyst rather than a pure Au catalyst.

Wittstock, A; Neumann, B; Schaefer, A; Dumbuya, K; Kuebel, C; Biener, M; Zielasek, V; Steinrueck, H; Gottfried, M; Biener, J; Hamza, A; B?umer, M

2008-09-04T23:59:59.000Z

91

Phospholipid-assisted synthesis of size-controlled gold nanoparticles  

SciTech Connect

Morphology and size control of gold nanoparticles (AuNPs) by phospholipids (PLs) has been reported. It was found that gold entities could form nanostructures with different sizes controlled by PLs in an aqueous solution. During the preparation of 1.5 nm gold seeds, AuNPs were obtained from the reduction of gold complex by sodium borohydride and capped by citrate for stabilization. With the different ratios between seed solution and growth solution, which was composed by gold complex and PLs, gold seeds grew into larger nanoparticles step by step until enough large size up to 30 nm. The main discovery of this work is that common biomolecules, such as PLs can be used to control nanoparticle size. This conclusion has been confirmed by transmission electron micrographs, particle size analysis, and UV-vis spectra.

He Peng [Department of Chemistry, North Carolina State University, Raleigh, NC 27695 (United States)]. E-mail: phe@ncsu.edu; Zhu Xinyuan [Instrumental Analysis Center, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030 (China)]. E-mail: xyzhu@sjtu.edu.cn

2007-07-03T23:59:59.000Z

92

Argonne CNM Highlight: Superparamagnetic Gold Nanoshells with Tunable  

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

Superparamagnetic Gold Nanoshells with Tunable Optical Properties Superparamagnetic Gold Nanoshells with Tunable Optical Properties Gold lNanoshells Gold Nanoshells TEM images showing the evolution of Au nanoshells after 12 cycles of seeded growth.; A solution-phase process has been developed by CNM users from the University of California at Riverside, working collaboratively with the Nanophotonics Group, for synthesizing stable multifunctional colloidal particles composed of a superparamagnetic Fe3O4 core, a gold nanoshell, and a mesoporous silica outer layer. The unique porous silica layer is produced by a surface-protected etching process. By tuning the pore structure of the silica networks through etching, the shape and size of the gold nanoparticles can be controlled during the seeded growth, as well as their interparticle plasmon coupling. Controllable interparticle coupling enables

93

NIST Reference Materials Are 'Gold Standard' for Bio ...  

Science Conference Proceedings (OSTI)

NIST Reference Materials Are 'Gold Standard' for Bio-Nanotech Research. ... The National Institute of Standards and Technology (NIST) has issued its ...

2013-03-15T23:59:59.000Z

94

Implementation of New Technology at Barrick Gold - Programmaster ...  

Science Conference Proceedings (OSTI)

Presentation Title, Implementation of New Technology at Barrick Gold. Author(s), Peter Kondos, ... DRI-based Continuous Steelmaking: From Theory to Practice.

95

Gel Electrophoresis of Gold-DNA Nano-Conjugates  

E-Print Network (OSTI)

electrophoresis of Gold-DNA nano-conjugates Abstract SingleEuropean Union (STREP program NANO-SA) and the Center for

Pellegrino, T.; Sperling, R.A.; Alivisatos, A.P.; Parak, W.J.

2008-01-01T23:59:59.000Z

96

The Suspension of the Gold Standard as Sustainable Monetary Policy  

E-Print Network (OSTI)

?s object is to maximize the household?s utility, it is able to stimulate economic activity by creating surprise in?ation in spite of the gold convertibility rule. If the central bank increases the discretionary money growth rate dt unexpectedly, the actual... the household?s willingness to convert gold to paper money. If the money growth rate approaches its upper bound, the household converts its whole gold endowment to paper currency. Simultaneously, At+1 ?gold in utility yielding form ?approaches zero, which...

Newby, E

97

Geology and Hydrothermal Alteration of the Gold Eagle Deposit: A ...  

Science Conference Proceedings (OSTI)

Recently, there have been many discoveries in the district including the Gold Eagle occurrence, located to the southwest of the old Cochenour-Willans mine...

98

COM 2011 (held with the World Gold Conference), POSTER SESSION  

Science Conference Proceedings (OSTI)

Geology and Hydrothermal Alteration of the Gold Eagle Deposit: A New Discovery in the Red Lake Camp, Canada Green State Joining of Silicon Nitride to Itself...

99

Epithermal Gold Mineralization and a Geothermal Resource at Blue...  

Open Energy Info (EERE)

1991 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for Epithermal Gold Mineralization and a Geothermal Resource at Blue Mountain,...

100

NNSA National Security Campus Receives LEED Gold Certification...  

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

Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > Media Room > Press Releases > NNSA National Security Campus Receives LEED Gold...

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Newest Los Alamos facility receives LEED Gold certification  

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

is first to achieve both the Leadership in Energy and Environmental Design status and LEED Gold certification. June 13, 2012 Radiological Laboratory Utility Office Building...

102

Newest LANL Facility Receives LEED Gold Certification | National...  

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

Newest LANL Facility Receives LEED Gold Certification | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear...

103

Effect of Gold Nanorod Surface Chemistry on Cellular Response  

E-Print Network (OSTI)

Gold nanorods (GNRs) stabilized with cetyltrimethylammonium bromide (CTAB) and GNR functionalized via a ligand exchange method with either thiolated polyethylene glycol (PEG5000) or mercaptohexadecanoic acid (MHDA) were ...

Grabinski, Christin

104

Life Cycle Assessment of Different Gold Extraction Process  

Science Conference Proceedings (OSTI)

Material consumption, energy consumption and emissions during each gold production process are analyzed by using Gabi 6 software, and the environmental...

105

Recovery of Gold from Aqueous Solution Using Bio-Adsorbent ...  

Science Conference Proceedings (OSTI)

This is an applied research to extract precious metal (e.g. gold) using cellulosic bio-adsorbents derived from solid biomass wood waste which are abundantly...

106

Antenna-coupled high T.sub.c superconducting microbolometer  

DOE Patents (OSTI)

A device is provided for measuring radiant energy, the device comprising a substrate; a bolometer formed from a high T.sub.c superconducting material disposed on the substrate in an area that is about 1.times.5 .mu.m.sup.2 and about 0.02 .mu.m in depth; and a planar antenna disposed on the substrate and coupled to receive radiation and to impart the received radiation to the bolometer.

Hu, Qing (Boston, MA)

1992-01-01T23:59:59.000Z

107

Interaction Between AM Radio Broadcast Antennas and Overhead Power Lines  

Science Conference Proceedings (OSTI)

Metallic structures, power lines or otherwise, can affect the operation of AM radio broadcast station antennas if the dimensions of those structures are related to the wavelength of the radio signal at the station's operating frequency. For power lines, the dimensions of interest can be either the height of the support structures themselves or the length of a loop formed by adjacent structures, the shield wires connecting them, and the return path in the earth. When resonance occurs between the power lin...

2012-05-10T23:59:59.000Z

108

Measuring Helical FCG Voltage with an Electric Field Antenna  

SciTech Connect

A method of measuring the voltage produced by a helical explosive flux compression generator using a remote electric field antenna is described in detail. The diagnostic has been successfully implemented on several experiments. Measured data from the diagnostic compare favorably with voltages predicted using the code CAGEN, validating our predictive modeling tools. The measured data is important to understanding generator performance, and is measured with a low-risk, minimally intrusive approach.

White, A D; Anderson, R A; Javedani, J B; Reisman, D B; Goerz, D A; Ferriera, A J; Speer, R D

2011-08-01T23:59:59.000Z

109

ELF and VLF radiation from the polar electrojet antenna  

SciTech Connect

An approximate evaluation is made of the ELF/VLF dipole moment of the polar electrojet antenna established by ionospheric heating via the use of powerful HF waves amplitude modulated with frequencies in the ELF/VLF range. The theory of reciprocity is used to determine the magnitude of the ELF/VLF waveguide excitation produced by such a dipole immersed in the ionosphere. Propagation under a series of ionospheres ranging from quiet auroral nighttime to disturbed auroral daytime is considered. 32 references.

Barr, R.; Stubbe, P.

1984-07-01T23:59:59.000Z

110

Antenna-coupled high T[sub c] superconducting microbolometer  

DOE Patents (OSTI)

A device is provided for measuring radiant energy, the device comprising a substrate; a bolometer formed from a high T[sub c] superconducting material disposed on the substrate in an area that is about 1[times]5 [mu]m[sup 2] and about 0.02 [mu]m in depth; and a planar antenna disposed on the substrate and coupled to receive radiation and to impart the received radiation to the bolometer. 5 figs.

Hu, Q.

1992-12-15T23:59:59.000Z

111

Method of making radio frequency ion source antenna  

DOE Patents (OSTI)

In the method, the radio frequency (RF) antenna is made by providing a clean coil made of copper tubing or other metal conductor, which is coated with a tacky organic binder, and then with a powdered glass frit, as by sprinkling the frit uniformly over the binder. The coil is then heated internally in an inert gas atmosphere, preferably by passing an electrical heating current along the coil. Initially, the coil is internally heated to about 200.degree. C. to boil off the water from the binder, and then to about 750.degree. C.-850.degree. C. to melt the glass frit, while also burning off the organic binder. The melted frit forms a molten glass coating on the metal coil, which is then cooled to solidify the glass, so that the metal coil is covered with a thin continuous homogeneous impervious glass coating of substantially uniform thickness. The glass coating affords complete electrical insulation and complete dielectric protection for the metal coil of the RF antenna, to withstand voltage breakdown and to prevent sputtering, while also doubling the plasma generating efficiency of the RF antenna, when energized with RF power in the vacuum chamber of an ion source for a particle accelerator or the like. The glass frit preferably contains apprxoimately 45% lead oxide.

Ehlers, Kenneth W. (Alamo, CA); Leung, Ka-Ngo (Hercules, CA)

1988-01-01T23:59:59.000Z

112

Miniaturized Multi-Band Antenna via Element Collocation  

SciTech Connect

Although much research has been performed on a driven element parasitically loaded by another element shorted to ground for dual frequency operation, the novel concept of two or more coplanar-driven elements in close proximity designed for multiple frequency operation has not been represented in the literature. Since each higher frequency antenna is built into the lower frequency elements, the largest element controls the structures total size. Furthermore, by using the self-resonant frequency inherent in reactive elements due to device packaging, the aperture of each antenna, due to a low insertion loss path at the frequency of the larger element, will include that of all smaller radiators. This configuration provides a large standing wave ratio at the shorter wavelengths via several series capacitive-inductive connections. Therefore, each antenna element provides the required surface area for the frequency of operation while being isolated from the larger radiators. For this study, a dual 2.45/5.8 GHz microstrip patch encompasses a small surface area of 9 square inches and provides circularly polarized electromagnetic radiation in excess of 6 dBi. This concept can be extrapolated to include additional radiators or may be scaled to other frequencies of interest.

Martin, R. P.

2012-04-19T23:59:59.000Z

113

Electronically controllable transmission line design for traveling wave array antenna feed network  

E-Print Network (OSTI)

In this thesis, an electronically controllable transmission line (ECTL) is presented. By modulating the conductivity of a doped Si modulator in the ECTL, the wave propagation constant in the ECTL is controlled. Measured results show a phase change in the ECTL at a single frequency when non-zero bias voltage is applied. This ECTL is implemented in order to feed a traveling wave array antenna, which is composed of 8 aperture-coupled microstrip antenna elements. It is demonstrated that phase change in an ECTL feed line has applications as a traveling wave array antenna with beam steering. S-parameter measurements are presented which demonstrate phase change in an ECTL and main beam steering of an 8-element traveling wave array antenna. The design procedure for an aperture-coupled microstrip antenna with a specific input impedance at the resonant frequency and a matching circuit design for a traveling wave array antenna are discussed in detail.

Shin, Chang-Seok

2002-01-01T23:59:59.000Z

114

Optical Properties of Gold Pyramidal Shells  

Science Conference Proceedings (OSTI)

We present an investigation of the optical properties of gold pyramidal shell nanoparticles. Theory shows a multiresonance spectrum at near-infrared wavelengths that is consistent with the measured extinction spectra of particles that are fabricated using a soft-lithography technique. In addition to electric dipole and electric quadrupole resonances, the calculations identify an unusual plasmon mode, which involves oscillation of the polarization perpendicular to the direction of both the incident polarization and wave vector. We show that this TE-like resonance can be suppressed by truncating the tip of the pyramid or by increasing the shell thickness without adversely affecting the in-plane dipole and quadrupole resonances.

Shuford, Kevin L [ORNL; Lee, Jeunghoon [Northwestern University, Evanston; Odom, Teri [Northwestern University, Evanston; Schatz, George C. [Northwestern University, Evanston

2008-01-01T23:59:59.000Z

115

Miniaturized Multi-Band Antenna Design via Element Collocation and Inductive Feed Loading  

SciTech Connect

In a FY09 SDRD project, four separate antennas were designed to receive signals of interest covering a broad range of frequencies. While the elements exceeded specifications, the array footprint is substantial. Research performed by the CU Microwave Active Antenna Group in collaboration with RSL, showed promise in realizing a reduced structure. This work will expand upon this previous research. This project will result in a prototype quad-band antenna.

Martin, R. P.

2012-09-12T23:59:59.000Z

116

Analysis and design of terahertz antennas based on plasmonic resonant graphene sheets  

SciTech Connect

Resonant graphene antennas used as true interfaces between terahertz (THz) space waves and a source/detector are presented. It is shown that in addition to the high miniaturization related to the plasmonic nature of the resonance, graphene-based THz antenna favorably compare with typical metal implementations in terms of return loss and radiation efficiency. Graphene antennas will contribute to the development of miniature, efficient, and potentially transparent all-graphene THz transceivers for emerging communication and sensing application.

Tamagnone, M. [Adaptive MicroNano Wave Systems, LEMA/Nanolab, Ecole Polytechnique Federale de Lausanne (EPFL), 1015 Lausanne (Switzerland); Laboratory of Electromagnetics and Acoustics (LEMA), Ecole Polytechnique Federale de Lausanne (EPFL), 1015 Lausanne (Switzerland); Gomez-Diaz, J. S.; Perruisseau-Carrier, J. [Adaptive MicroNano Wave Systems, LEMA/Nanolab, Ecole Polytechnique Federale de Lausanne (EPFL), 1015 Lausanne (Switzerland); Mosig, J. R. [Laboratory of Electromagnetics and Acoustics (LEMA), Ecole Polytechnique Federale de Lausanne (EPFL), 1015 Lausanne (Switzerland)

2012-12-01T23:59:59.000Z

117

Method for aqueous gold thiosulfate extraction using copper-cyanide pretreated carbon adsorption  

Science Conference Proceedings (OSTI)

A gold thiosulfate leaching process uses carbon to remove gold from the leach liquor. The activated carbon is pretreated with copper cyanide. A copper (on the carbon) to gold (in solution) ratio of at least 1.5 optimizes gold recovery from solution. To recover the gold from the carbon, conventional elution technology works but is dependent on the copper to gold ratio on the carbon.

Young, Courtney; Melashvili, Mariam; Gow, Nicholas V

2013-08-06T23:59:59.000Z

118

Thin magnetic conductor substrate for placement-immune, electrically-small antennas.  

SciTech Connect

An antenna is considered to be placement-immune when the antenna operates effectively regardless of where it is placed. By building antennas on magnetic conductor materials, the radiated fields will be positively reinforced in the desired radiation direction instead of being negatively affected by the environment. Although this idea has been discussed thoroughly in theoretical research, the difficulty in building thin magnetic conductor materials necessary for in-phase field reflections prevents this technology from becoming more widespread. This project's purpose is to build and measure an electrically-small antenna on a new type of non-metallic, thin magnetic conductor. This problem has not been previously addressed because non-metallic, thin magnetic conductor materials have not yet been discovered. This work proposed the creation of an artificial magnetic conductor (AMC) with in-phase field reflections without using internal electric conductors, the placement of an electrically-small antenna on this magnetic conductor, and the development of a transmit-receive system that utilizes the substrate and electrically-small antenna. By not using internal electric conductors to create the AMC, the substrate thickness can be minimized. The electrically-small antenna will demonstrate the substrate's ability to make an antenna placement immune, and the transmit-receive system combines both the antenna and the substrate while adding a third layer of system complexity to demonstrate the complete idea.

Eubanks, Travis Wayne; McDonald, Jacob J.; Loui, Hung

2011-09-01T23:59:59.000Z

119

Boiler Gold Rush Prof. Johnny Brown (MATH 700)  

E-Print Network (OSTI)

Boiler Gold Rush Prof. Johnny Brown (MATH 700) jeb@math.purdue.edu #12;#12;#12;David McCullough, Jr help Always be prepared #12;Boiler Gold Rush Prof. Johnny Brown (MATH 700) jeb@math.purdue.edu #12;

Brown, Johnny E.

120

Exhaust system having a gold-platinum group metal catalyst  

DOE Patents (OSTI)

A method of providing an exhaust treatment device is disclosed. The method includes applying a catalyst including gold and a platinum group metal to a particulate filter. The concentration of the gold and the platinum group metal is sufficient to enable oxidation of carbon monoxide and nitric oxide.

Ragle, Christie Susan (Havana, IL); Silver, Ronald G. (Peoria, IL); Zemskova, Svetlana Mikhailovna (Edelstein, IL); Eckstein, Colleen J. (Metamora, IL)

2011-12-06T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Hoteliers Strike Gold with Geothermal Alaskan Resort | Department of Energy  

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

Hoteliers Strike Gold with Geothermal Alaskan Resort Hoteliers Strike Gold with Geothermal Alaskan Resort Hoteliers Strike Gold with Geothermal Alaskan Resort November 23, 2009 - 6:31pm Addthis Eric Barendsen Energy Technology Program Specialist, Office of Energy Efficiency and Renewable Energy What are the key facts? Bernie estimates he saves anywhere from $300,000 to $400,000 in electricity costs alone each year using geothermal power generators rather than diesel. Bernie Karl knows a gold mine when he sees one. In the 1970s, Bernie and his wife Connie moved to Alaska and mined gold in the frontier before eventually landing their dream job of running Chena Hot Springs Resort, just outside of Fairbanks. "We always wanted to own a hot springs," Bernie says. In 1998, Bernie bought the Chena Hot Springs Resort, and the 22-building

122

Epithermal Gold Mineralization and a Geothermal Resource at Blue Mountain,  

Open Energy Info (EERE)

Epithermal Gold Mineralization and a Geothermal Resource at Blue Mountain, Epithermal Gold Mineralization and a Geothermal Resource at Blue Mountain, Humboldt County, Nevada Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Epithermal Gold Mineralization and a Geothermal Resource at Blue Mountain, Humboldt County, Nevada Abstract Shallow exploration drilling on the west flank of Blue Mountain discovered sub economic gold mineralization and a spatially associated active geothermal system. The gold mineralization is an unusual example of an acid sulfate type epithermal system developed in pre Tertiary sedimentary host rocks. The geothermal system is largely unexplored but is unusual in that surface manifestation s typically associated with active geothermal system are not present. Authors Andrew J. Parr and Timothy J. Percival

123

Going for the Gold (Computer), Again | Department of Energy  

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

Going for the Gold (Computer), Again Going for the Gold (Computer), Again Going for the Gold (Computer), Again June 1, 2011 - 1:41pm Addthis John Lippert As I mentioned in my March 3, 2009 blog, it wasn't easy to locate and buy an EPEAT Gold desktop computer when I was in the market nearly three years ago. (For those of you new to the scene, the Green Electronics Council Electronic Product Environmental Assessment Tool (EPEAT) rates electronic products based on 51 total environmental criteria: 23 required environmental performance criteria, plus an additional 28 optional criteria. Products are then rated Gold, Silver, or Bronze based on the optional criteria they meet. Meeting the ENERGY STAR® standard currently in effect is a minimum requirement; an additional point is earned if the product meets the more stringent standard that ENERGY STAR has developed

124

Newest Los Alamos facility receives LEED® Gold certification  

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

Newest facility receives LEED® Gold certification Newest facility receives LEED® Gold certification Newest Los Alamos facility receives LEED® Gold certification The Radiological Laboratory Utility Office Building is first to achieve both the Leadership in Energy and Environmental Design status and LEED Gold certification. June 13, 2012 Radiological Laboratory Utility Office Building Radiological Laboratory Utility Office Building Contact Kim Powell Communications Office (505) 695-6159 Email LOS ALAMOS, New Mexico, June 13, 2012-Los Alamos National Laboratory's newest facility, the Radiological Laboratory Utility Office Building (RLUOB), is also its first to achieve both the Leadership in Energy and Environmental Design (LEED) status and LEED Gold certification from the U.S. Green Building Council (USGBC).

125

Hoteliers Strike Gold with Geothermal Alaskan Resort | Department of Energy  

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

Hoteliers Strike Gold with Geothermal Alaskan Resort Hoteliers Strike Gold with Geothermal Alaskan Resort Hoteliers Strike Gold with Geothermal Alaskan Resort November 23, 2009 - 6:31pm Addthis Eric Barendsen Energy Technology Program Specialist, Office of Energy Efficiency and Renewable Energy What are the key facts? Bernie estimates he saves anywhere from $300,000 to $400,000 in electricity costs alone each year using geothermal power generators rather than diesel. Bernie Karl knows a gold mine when he sees one. In the 1970s, Bernie and his wife Connie moved to Alaska and mined gold in the frontier before eventually landing their dream job of running Chena Hot Springs Resort, just outside of Fairbanks. "We always wanted to own a hot springs," Bernie says. In 1998, Bernie bought the Chena Hot Springs Resort, and the 22-building

126

TWO POPULATIONS OF MOLECULAR CLOUDS IN THE ANTENNAE GALAXIES  

SciTech Connect

Super star clusters-extremely massive clusters found predominately in starburst environments-are essential building blocks in the formation of galaxies and thought to dominate star formation in the high-redshift universe. However, the transformation from molecular gas into these ultracompact star clusters is not well understood. To study this process, we used the Submillimeter Array and the Plateau de Bure Interferometer to obtain high angular resolution ({approx}1.''5 or 160 pc) images of the Antennae overlap region in CO(2-1) to search for the molecular progenitors of the super star clusters. We resolve the molecular gas distribution into a large number of clouds, extending the differential cloud mass function down to a 5{sigma} completeness limit of 3.8 Multiplication-Sign 10{sup 5} M{sub Sun }. We identify a distinct break in the mass function around log M{sub mol}/M{sub Sun} Almost-Equal-To 6.5, which separates the molecular clouds into two distinct populations. The smaller, less massive clouds reside in more quiescent areas in the region, while the larger, more massive clouds cluster around regions of intense star formation. A broken power-law fit to the mass function yields slopes of {alpha} = -1.39 {+-} 0.10 and {alpha} = -1.44 {+-} 0.14 for the low- and high-mass cloud population, well matched to the mass function found for super star clusters in the Antennae galaxies. We find large velocity gradients and velocity dispersions at the locations of intense star formation, suggestive of compressive shocks. It is likely that these environmental factors contribute to the formation of the observed massive molecular clouds and super star clusters in the Antennae galaxies.

Wei, Lisa H.; Keto, Eric [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Ho, Luis C. [The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States)

2012-05-10T23:59:59.000Z

127

Proposal of an Arc Detection Technique Based on RF Measurements for the ITER ICRF Antenna  

SciTech Connect

RF arc detection is a key operational and safety issue for the ICRF system on ITER. Indeed the high voltages inside the antenna put it at risk of arcing, which could cause substantial damage. This paper describes the various possibilities explored by circuit simulation and the strategy now considered to protect the ITER ICRF antenna from RF arcs.

Huygen, S.; Dumortier, P.; Durodie, F.; Messiaen, A.; Vervier, M.; Vrancken, M. [LPP/ERM-KMS, Association EURATOM-Belgian State, Brussels (Belgium); Wooldridge, E. [EURATOM/CCFE Fusion Association, Culham Science Centre (United Kingdom)

2011-12-23T23:59:59.000Z

128

Performance evaluation of spatially multiplexed MIMO systems with subset antenna transmission in interference limited environments  

Science Conference Proceedings (OSTI)

Transmit antenna selection in spatially multiplexed multiple-input multiple-output (MIMO) systems is a low complexity low-rate feedback technique, which involves transmission of a reduced number of streams from the maximum possible to improve the error ... Keywords: Co-channel interference, MIMO systems, Orthogonal frequency division multiplexing, Transmit antenna selection

Shreeram Sigdel; Witold A. Krzymie?

2007-10-01T23:59:59.000Z

129

Electronicallyswitched directional antennas for low-power wireless networks: A prototype-driven evaluation  

E-Print Network (OSTI)

AbstractWe study the benefits of electronically-switched directional (ESD) antennas in wireless sensor networks (WSNs). ESD antennas have proved beneficial in cellular and ad-hoc networks, by increasing the communication range and by alleviating contention in directions other than the destination. The advantages in WSNs are, however, still largely to be quantified. Unlike existing works in this field, we start by characterizing a real-world antenna prototype, and apply this to an existing WSN stack, which we adapt with minimal changes. Our results show that: i) the combination of a low-cost ESD antenna and a mainstream WSN stack already brings significant performance improvements, e.g., nearly halving the radio-on time per delivered packet; ii) the margin of improvement available to alternative clean-slate protocol designs is similarly large and concentrated in the control rather than the data plane; iii) by artificially modifying our antennas link-layer model, further potential benefits opened by different antenna designs may be available. To the best of our knowledge, this is the first study providing such quantitative insights based on a real ESD antenna prototype and a complete WSN stack. I.

Luca Mottola; Thiemo Voigt; Gian Pietro Picco

2012-01-01T23:59:59.000Z

130

Scattering of terahertz radiation on a graphene-based nano-antenna  

E-Print Network (OSTI)

Scattering of terahertz radiation on a graphene-based nano-antenna Ignacio Llatser, , Christian, D6-008 08034 Barcelona, Spain Theoretical Nano-Photonics Group, Institute of High. Scattering of the terahertz radiation on a graphene-based nano-antenna is considered. Different

Cabellos-Aparicio, Albert

131

Temporal Reference Algorithms versus Spatial Reference Algorithms forSmart Antennas  

Science Conference Proceedings (OSTI)

This paper compares algorithms from three different classes of adaptation schemes for smart antennas the switched beam approach, a Temporal-Reference (TR) technique based on Direct Matrix Inversion or Least Squares adaptation, and a Spatial-Reference ... Keywords: adaptation algorithms, angular spread, comparison, mutual coupling, smart antennas

Josef Fuhl; Ernst Bonek

1999-05-01T23:59:59.000Z

132

Using antennas separated in flight direction to avoid effect of emitter clock drift in geolocation  

DOE Patents (OSTI)

The location of a land-based radio frequency (RF) emitter is determined from an airborne platform. RF signaling is received from the RF emitter via first and second antennas. In response to the received RF signaling, signal samples for both antennas are produced and processed to determine the location of the RF emitter.

Ormesher, Richard C.; Bickel, Douglas L

2012-10-23T23:59:59.000Z

133

Design and development of stacked patch antenna for breast cancer detection  

Science Conference Proceedings (OSTI)

Breast cancer affects many women, and early detection aids in fast and effective treatment. Mammography, which is currently the most popular method of breast screening, has some limitations, and microwave imaging offers an attractive alternative. The ... Keywords: breast cancer detection, stacked patch antenna, wide slot antenna

N. Mahalakshmi; N. R. Indira; P. Vasikaran

2011-02-01T23:59:59.000Z

134

The Oblique Spaced Antenna Method for Measuring the Atmospheric Wind Field  

Science Conference Proceedings (OSTI)

A novel extension of the spaced antenna method for VHF/UHF radar and wind profiler applications is introduced in this paper. It is proposed that instead of pointing the spaced antenna beams vertically, off-vertical oblique configuration should be ...

C. H. Liu; G. Dester; S. J. Franke; J. Rttger; C-J. Pan

1991-04-01T23:59:59.000Z

135

Energy-efficient multicast with directional antennae and localized tree reconfiguration  

Science Conference Proceedings (OSTI)

Ad hoc nodes are usually battery-powered. Thus, energy-efficiency is of paramount importance in wireless ad hoc and sensor networks. The use of directional antennae helps to reduce energy consumption by aiming the beam only to the intended target using ... Keywords: ad hoc networks, directional antennae, energy efficiency, multicast, routing protocol

Carmen M. Yago; Pedro M. Ruiz

2006-10-01T23:59:59.000Z

136

Design of a wideband multi-standard antenna switch for wireless communication devices  

Science Conference Proceedings (OSTI)

A wideband Low Power Single Pole 6-Throw (SP6T) antenna switch has been designed for GSM/DCS/802.11b mobile standards using a newly improved architecture and fabricated using a pseudomorphic depletion mode 0.18@mm HEMT GaAs process. The switch exhibits ... Keywords: Antenna switch, GaAs, MMIC, Mobile telecommunications, Wideband, pHEMT transistors

Vlad Marian; Jacques Verdier; Bruno Allard; Christian Vollaire

2011-05-01T23:59:59.000Z

137

Detection of partial discharges by a monopole antenna in insulation oil  

Science Conference Proceedings (OSTI)

This paper dealt with the measurement and analysis of electromagnetic waves generated by partial discharge (PD) in insulation oil to develop insulation diagnostic techniques for oil-immersed transformers. Two types of narrow-band monopole antennas with ... Keywords: electromagnetic wave, insulation diagnosis, insulation oil, monopole antenna, partial discharge (PD), resonant frequency

Chang-Hwan Jin; Jung-Yoon Lee; Dae-Won Park; Gyung-Suk Kil

2012-04-01T23:59:59.000Z

138

Optical antenna design for indoor optical wireless communication systems: Research Articles  

Science Conference Proceedings (OSTI)

In the present paper, the design of the non-imaging totally internally reflecting concentrator family denominated optical antennas (OAs) is discussed, and its use for indoor optical wireless communication systems is explained. The lenses presented here ... Keywords: antenna, communications, indoor, infrared, optical, wireless

R. Ramirez-Iniguez; R. J. Green

2005-04-01T23:59:59.000Z

139

Beamforming in Intelligent Randomly Distributed Sensor Networks using Electrically-Small Dual-Sector Antennas for Planetary Exploration  

E-Print Network (OSTI)

-to-noise ratio varies and for different num- bers of nodes (sensors). 2. Electrcally small stacked sector antenna

Singer, Andrew C

140

A Six-Beam-Switched Array Antenna for 5.2 GHz High-Speed Wireless Local Area Networks  

Science Conference Proceedings (OSTI)

A six-beam-switched array antenna with a flat profile was designed for the application of high-speed wireless local-area networks in the range of 56 GHz. This six-beam-switched array antenna is composed of an analog beamformer and a microstrip-slot ... Keywords: beamformer, single-pole double-throw switch, slot antenna, switched-beam antenna

Sheng-Fuh Chang; Jia-Liang Chen; Chin-San Lin; Jing-Jang Luo

2001-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Misers gold dust collection and cloud characterization  

SciTech Connect

MISERS GOLD was a surface detonation of 2445 tons of ammonium nitrate-fuel oil blasting agent conducted by the Defense Nuclear Agency for a variety of research purposes. This report presents the results of an experiment designed to study the dust cloud over the 24-hour period following the detonation. The cloud was sampled by aircraft to obtain material needed to characterize the quantity of dust lofted, the source regions of the cloud, and the size, shape, and mineralogical characteristics of the particles. Elemental tracers and organic dyes were emplaced in the charge and in surrounding areas. Analyses were done by instrumental neutron activation analysis (INAA), fluorimetry, scanning electron microscopy (SEM), and energy-dispersive spectrometry (EDS). Tracer data define the source regions of the dust cloud. Extensive particle size distribution data were obtained. 12 figs.

Mason, A.S.; Finnegan, D.L.; Bayhurst, G.K.; Raymond, R. Jr.; Hagan, R.C.; Luedemann, G.; Wohletz, K.H.

1991-01-01T23:59:59.000Z

142

Surface chemistry driven actuation in nanoporous gold  

SciTech Connect

Although actuation in biological systems is exclusively powered by chemical energy, this concept has not been realized in man-made actuator technologies, as these rely on generating heat or electricity first. Here, we demonstrate that surface-chemistry driven actuation can be realized in high surface area materials such as nanoporous gold. For example, we achieve reversible strain amplitudes in the order of a few tenths of a percent by alternating exposure of nanoporous Au to ozone and carbon monoxide. The effect can be explained by adsorbate-induced changes of the surface stress, and can be used to convert chemical energy directly into a mechanical response thus opening the door to surface-chemistry driven actuator and sensor technologies.

Biener, J; Wittstock, A; Zepeda-Ruiz, L; Biener, M M; Zielasek, V; Kramer, D; Viswanath, R N; Weissmuller, J; Baumer, M; Hamza, A V

2008-04-14T23:59:59.000Z

143

GOLD CLUSTER LABELS AND RELATED TECHNOLOGIES IN MOLECULAR MORPHOLOGY.  

Science Conference Proceedings (OSTI)

Although intensely colored, even the largest colloidal gold particles are not, on their own, sufficiently colored for routine use as a light microscopy stain: only with very abundant antigens or with specialized illumination methods can bound gold be seen. Colloidal gold probes were developed primarily as markers for electron microscopy, for which their very high electron density and selectivity for narrow size distributions when prepared in different ways rendered them highly suited. The widespread use of gold labeling for light microscopy was made possible by the introduction of autometallographic enhancement methods. In these processes, the bound gold particles are exposed to a solution containing metal ions and a reducing agent; they catalyze the reduction of the ions, resulting in the deposition of additional metal selectively onto the particles. On the molecular level, the gold particles are enlarged up to 30-100 nm in diameter; on the macroscale level, this results in the formation of a dark stain in regions containing bound gold particles, greatly increasing visibility and contrast. The applications of colloidal gold have been described elsewhere in this chapter, we will focus on the use of covalently linked cluster complexes of gold and other metals. A gold cluster complex is a discrete molecular coordination compound comprising a central core, or ''cluster'' of electron-dense metal atoms, ligated by a shell of small organic molecules (ligands), which are linked to the metal atoms on the surface of the core. This structure gives clusters several important advantages as labels. The capping of the metal surface by ligands prevents non-specific binding to cell and tissue components, which can occur with colloidal gold. Cluster compounds are more stable and may be used under a wider range of conditions. Unlike colloidal gold, clusters do not require additional macromolecules such as bovine serum albumin or polyethylene glycol for stabilization, and the total size of the label is therefore significantly smaller. Since the clusters considered in this chapter are generally less than 3 nm in diameter, this allows the preparation of probes that are much smaller than conventional immunocolloids, and cluster labeling can take advantage of the higher resolution and penetration available with smaller conjugates. Most importantly, while colloidal gold is adsorbed to its conjugate probe, clusters are conjugated by chemically specific covalent cross-linking. Therefore, the range of possible conjugate targeting agents includes any probe containing an appropriate reactive group. Clusters conjugates have been prepared with a wide variety of molecules that do not form colloidal gold conjugates, including lipids, oligonucleotides, peptides, and other small molecules. In addition to the development of gold cluster labeling technology, this chapter will also review new developments in the related metallographic, or metal deposition, methods. This includes gold enhancement, in which gold rather than silver is selectively deposited onto gold particles. We will also describe some results obtained using another novel metallographic procedure, enzyme metallography, in which metal is directly deposited from solution by an enzymatic reaction. Because the original, and most widespread, use of metal cluster labels is in electron microscopy, many of the light microscopy methods described were developed as extensions of, or complements to electron microscopy methods, and demonstrate their greatest advantages when used with electron microscopy; therefore reference will also be made to the electron microscope methods used in the same studies, and the unique information that may be obtained from the correlation of both methods.

HAINFELD,J.F.; POWELL,R.D.

2004-02-04T23:59:59.000Z

144

Trace element fingerprinting of ancient Chinese gold with femtosecond laser  

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

Trace element fingerprinting of ancient Chinese gold with femtosecond laser Trace element fingerprinting of ancient Chinese gold with femtosecond laser ablation-inductivity coupled mass spectrometry Title Trace element fingerprinting of ancient Chinese gold with femtosecond laser ablation-inductivity coupled mass spectrometry Publication Type Journal Article Year of Publication 2009 Authors Brostoff, Lynn B., Jhanis J. Gonzalez, Paul Jett, and Richard E. Russo Journal Journal of Archeological Science Volume 36 Start Page 461 Issue 2 Pagination 461-466 Date Published 02/2009 Keywords Ancient gold, femtosecond, la-icp-ms, Trace element Abstract In this collaborative investigation, femtosecond laser ablation-inductively coupled mass spectrometry (LA-ICP-MS) was applied to the study of a remarkable group of ancient Chinese gold objects in the Smithsonian's Freer Gallery of Art and Arthur M. Sackler Gallery. Taking advantage of the superior ablation characteristics and high precision of a femtosecond 266 nm Ti:sapphire laser at Lawrence Berkeley National Laboratory, major, minor and trace element concentrations in the gold fragments were quantified. Results validate use of femtosecond LA-ICP-MS for revealing ''fingerprints'' in minute gold samples. These fingerprints allow us to establish patterns based on the association of silver, palladium and platinum that support historical, technical and stylistic relationships, and shed new light on these ancient objects.

145

Coupling characteristics of the ITER relevant lower hybrid antenna in Tore Supra: experiments and modelling  

Science Conference Proceedings (OSTI)

A new concept of lower hybrid antenna for current drive has been proposed for ITER [Bibet et al, Nuclear Fusion 1995]: the Passive Active Multijunction (PAM) antenna that relies on a periodic combination of active and passive waveguides. An actively cooled PAM antenna at 3.7 GHz has been recently installed on the tokamak Tore Supra. The paper summarizes the comprehensive experimental characterization of the linear coupling properties of the PAM antenna to the Tore Supra plasmas. These experimental results are systematically compared with the linear wave coupling theory via the linear ALOHA code. Good agreement between experimental results and ALOHA have been obtained. The detailed validation of the coupling modelling is an important step toward the validation of the PAM concept in view of further optimizing the electromagnetic properties of the future ITER antenna.

Preynas, M.; Ekedahl, A.; Fedorczak, N.; Goniche, M.; Guilhem, D.; Gunn, J. P.; Hillairet, J.; Litaudon, X. [CEA, IRFM, 13108 Saint Paul lez Durance (France); Associacao Euratom-IST, Centro de Fusao Nuclear 1049-001 Lisboa (Portugal)

2011-12-23T23:59:59.000Z

146

Antenna organization in green photosynthetic bacteria. Progress report, July 1, 1985--June 30, 1987  

DOE Green Energy (OSTI)

This project is concerned with the structure and function of the unique antenna system found in the green photosynthetic bacteria. The antenna system in these organisms is contained within a vesicle known as a chlorosome, which is attached to the cytoplasmic side of the cell membrane. Additional antenna pigments and reaction centers are contained in integral membrane proteins. Energy absorbed by the bacteriochlorophyll c (BChl c) pigments in the chlorosome is transferred via a ``baseplate`` array of BChl a antenna pigments into the membrane and to the reaction center. A schematic model of chlorosome structure is shown. This project is aimed at increasing our understanding of the organization of the pigments in the chlorosome and how the antenna system functions.

Blankenship, R.E.

1987-12-31T23:59:59.000Z

147

Commissioning of the ITER-like ICRF antenna for JET  

Science Conference Proceedings (OSTI)

The new JET ion cyclotron resonance frequency (ICRF) ITER-like antenna (ILA), which was assembled during 2006, was commissioned on the JET RF testbed prior to installation on the JET torus. The 4 resonant double loops (RDL) of the ILA were tested at high power at 42 MHz up to 42 kV for 5 s in 10 min intervals. Low power matching studies using a saltwater load placed in front of the ILA have allowed testing and optimizing proposed matching algorithms on single RDLs, paired RDLs and finally on the full array. The upper limit of the frequency range of the ILA appears to be limited to 47 49 MHz due to the effect on the electrical lengths of the connection between the capacitors and the conjugate T point. Capacitor position scans have allowed obtaining the necessary data to confirm the RF model of the RDL which is necessary for the scattering matrix arc detection. The latter is deemed necessary in order to detect arcs at the low impedance conjugate T of the circuit. The antenna was installed onto JET during August 2007 and commissioning on plasma started May 2008. At present the commissioning of the ILA on JET is ongoing in a series of dedicated experimental campaigns.

Durodie, F. [ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium; Dumortier, P. [ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium; Huygen, S. [ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium; Jachmich, S. [ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium; Lerche, E. [ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium; Messiaen, A. [ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium; Ongena, J. [ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium; Van Eester, D. [Laboratory for Plasma Physics-ERM/KMS (LPP-ERM/KMS), Brussels, Belgium; Vervier, M. [ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium; Vrancken, M. [ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium; Nightingale, M. [EURATOM / UKAEA, Abingdon, UK; Blackman, T. [EURATOM / UKAEA, Abingdon, UK; Edwards, P. [EURATOM / UKAEA, Abingdon, UK; Fanthome, J. [EURATOM / UKAEA, Abingdon, UK; Graham, M. [EURATOM / UKAEA, Abingdon, UK; Jacquet, P. [EURATOM / UKAEA, Abingdon, UK; Kaye, A. [EURATOM / UKAEA, Abingdon, UK; Mayoral, M. -L. [EURATOM / UKAEA, Abingdon, UK; Monakhov, I. [EURATOM / UKAEA, Abingdon, UK; Nicholls, K. [EURATOM / UKAEA, Abingdon, UK; Stork, D. [EURATOM / UKAEA, Abingdon, UK; Walden, A. [EURATOM / UKAEA, Abingdon, UK; Whitehurst, A. [EURATOM / UKAEA, Abingdon, UK; Zastrow, K. -D. [EURATOM / UKAEA, Abingdon, UK; Argouarch, A. [CEA-Cadarache, St. Paul lex Durance, France; Berger-By, G. [CEA-Cadarache, St. Paul lex Durance, France; Loarer, T. [CEA-Cadarache, St. Paul lex Durance, France; Rimini, F. [CEA-Cadarache, St. Paul lex Durance, France; Castano-Giraldo, C. [University of Illinois, Urbana-Champaign; Caughman, John B [ORNL; Goulding, Richard Howell [ORNL; Cocilovo, V. [Association Euratom-ENEA sulla Fusione, Italy; Frigione, D. [Association Euratom-ENEA sulla Fusione, Italy; Sozzi, C. [Association Euratom-ENEA sulla Fusione, Italy; Hobrik, J. [Max-Planck-Institut fu?r Plasmaphysik, EURATOM Association, Garching, Germany; Lamalle, Philippe [ITER Joint Work Site, Cadarache; Nave, M. F. F. [Association EURATOM/IST, Lisbon, Portugal; Tsalas, M. [Association EURATOM-Hellas, Attica, Greece

2009-06-01T23:59:59.000Z

148

New chemistry with gold-nitrogen complexes: synthesis and characterization of tetra-, tri-, and dinuclear gold(I) amidinate complexes. Oxidative-addition to the dinuclear gold(I) amidinate  

E-Print Network (OSTI)

Nitrogen ligands have been little studied with gold(I) and almost no chemistry has been described using anionic bridging nitrogen ligands. This dissertation concerns the impact of the bridging ligands amidinate, ArNHC(H)NAr, on the chemistry of gold(I) and, in particular, the effect of substituents on the molecular arrangement. The electronic vs. steric effect of the substituents on the molecular arrangement of gold(I) amidinates complexes is studied in detail. Tetra-, tri-, and dinuclear gold(I) amidinate complexes are synthesized and characterized using X-ray diffraction. Spectroscopic and electrochemical studies of the amidinate complexes are described. Catalytic studies suggest that gold amidinates and related gold nitrogen complexes are the best catalyst precursors for CO oxidation on TiO2 surface reported to date (87% conversion). The dinuclear gold(I) amidinate complex with a Au Au distance of 2.711(3) is rare. To our knowledge, there is only one other example of a symmetrical dinuclear gold(I) nitrogen complex. Oxidative-addition reactions to the dinuclear gold(I) complex, [Au2(2,6-Me2-form)2] are studied in detail and result in the formation of gold(II) complexes. The gold(II) amidinate complexes are the first formed with nitrogen ligands. The complexes are stable at room temperature. Mixed ligand tetranuclear gold(I) clusters and tetranuclear mixed Au-Ag metal clusters of pyrazolate and amidinate ligands are synthesized and characterized using Xray diffraction.

Abdou, Hanan Elsayed

2006-05-01T23:59:59.000Z

149

JGI Sets 'Gold Standard' for Metagenomic Data Analysis  

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

14, 2007 14, 2007 DOE JGI Sets 'Gold Standard' for Metagenomic Data Analysis WALNUT CREEK, CA--With the advent of more powerful and economical DNA sequencing technologies, gene discovery and characterization is transitioning from single-organism studies to revealing the potential biotechnology applications embedded in communities of microbial genomes, or metagenomes. The field of metagenomics is still in its infancy--the equivalent of the early days of the California Gold Rush, with labs vying to stake their claim. Amidst the prospecting, the call has been issued for methods to separate fool's gold from the real nuggets. Such a gold standard has now been provided through work led by the U.S. Department of Energy Joint Genome Institute (DOE JGI) with colleagues from Oak Ridge National Laboratory and

150

Federal Electronics Challenge Gold Award | Department of Energy  

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

Federal Electronics Challenge Gold Award Federal Electronics Challenge Gold Award Federal Electronics Challenge Gold Award June 18, 2009 - 12:24pm Addthis Left to right: EPA Assistant Administrator Jim Jones, Jeff Eagan, Brian Costlow, Kathy Loftin, Tony Castellano, and Kevin Cooke. (photo courtesy of EPA) Left to right: EPA Assistant Administrator Jim Jones, Jeff Eagan, Brian Costlow, Kathy Loftin, Tony Castellano, and Kevin Cooke. (photo courtesy of EPA) On June 18th, DOE Headquarters was presented the Federal Electronics Challenge Gold Award for exemplary performance in Green Computing, including green procurement, energy efficient operations and maintenance, and environmentally safe disposition of surplus equipment. Receiving the award from EPA Assistant Administrator Jim Jones (left) was the

151

Bacterium Helps in the Formation of Gold | Advanced Photon Source  

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

Creating a Precise Atomic-Scale Map of Quantum Dots Creating a Precise Atomic-Scale Map of Quantum Dots Getting to the Roots of Lethal Hairs Stressing Out the Twins in Magnesium Size-Related Behavior of Anatase Nanocrystals under Extreme Pressure Boron-Based Compounds Trick a Biomedical Protein Science Highlights Archives: 2013 | 2012 | 2011 | 2010 2009 | 2008 | 2007 | 2006 2005 | 2004 | 2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed Bacterium Helps in the Formation of Gold OCTOBER 13, 2009 Bookmark and Share Top: An ultra-thin section of C. metallidurans containing a gold nanoparticle. Bottom: This image shows maps of pure gold with other elements. By determining what elements there are, scientists can see where the gold is located in relation to the cells. These maps are quantitative

152

Newest LANL Facility Receives LEED Gold Certification | National Nuclear  

National Nuclear Security Administration (NNSA)

Newest LANL Facility Receives LEED Gold Certification | National Nuclear Newest LANL Facility Receives LEED Gold Certification | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > NNSA Blog > Newest LANL Facility Receives LEED Gold Certification Newest LANL Facility Receives LEED Gold Certification Posted By Office of Public Affairs RULOB LANL's newest facility, the Radiological Laboratory Utility Office

153

DOE - Office of Legacy Management -- Humphreys Gold Co - FL 08  

Office of Legacy Management (LM)

Humphreys Gold Co - FL 08 Humphreys Gold Co - FL 08 FUSRAP Considered Sites Site: Humphreys Gold Co. (FL.08 ) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: None Location: Jacksonville , Florida FL.08-1 Evaluation Year: 1987 FL.08-2 FL.08-3 Site Operations: Processed monazite ore in the 1950s. FL.08-3 Site Disposition: Eliminated - No Authority - No AEC involvement at the site FL.08-2 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Thorium FL.08-1 Radiological Survey(s): No Site Status: Eliminated from consideration under FUSRAP Also see Documents Related to Humphreys Gold Co. FL.08-1 - AEC Memorandum; Edmonds to McCarvill; Subject: Monazite Dredging Operations and Placer Deposits Containing Thorium Minerals; June

154

Hanford Treatment Facility Achieves First Gold Ranking for Sustainable  

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

Treatment Facility Achieves First Gold Ranking for Treatment Facility Achieves First Gold Ranking for Sustainable Design in EM Complex: New groundwater treatment facility will be Hanford's largest, greenest pump-and-treat system Hanford Treatment Facility Achieves First Gold Ranking for Sustainable Design in EM Complex: New groundwater treatment facility will be Hanford's largest, greenest pump-and-treat system May 1, 2012 - 12:00pm Addthis Workers use a lift to access part of the 200 West Groundwater Treatment Facility. Workers use a lift to access part of the 200 West Groundwater Treatment Facility. Pump-and-treat construction managers David Fink (left) and Delise Pargmann (right) review information for the LEED gold certification of the main process building for the 200 West Groundwater Treatment Facility.

155

NETL: News Release - NETL Receives Blue Pencil and Gold Screen...  

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

The honor was awarded at the NAGC Blue Pencil and Gold Screen Awards Reception and Banquet on Monday, May 17,2010, in Bethesda, Md., during the 2010 NAGC Communications School....

156

Guided Self-Assembly of Gold Thin Films  

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

Self-Assembly of Gold Thin Films Print Nanoparticles-man-made atoms with unique optical, electrical, and mechanical properties-have become key components in many fields of...

157

Academic Handbook, Scholarships, Gold Medals Page 1 Issued: 2012 06  

E-Print Network (OSTI)

Administration (S.08-169, S.09-152) Students in the combined JD/MBA prog ram are not eligible for the Gold Medal: 2012 06 Prior to June 2012, the requirements were: Undergraduate reform was introduced effective

Sinnamon, Gordon J.

158

BOOSTER GOLD BEAM INJECTION EFFICIENCY AND BEAM LOSS  

SciTech Connect

The Relativistic Heavy Ion Collider (RHIC) at the BNL requires the AGS to provide Gold beam with the intensity of 10{sup 9} ions per bunch. Over the years, the Tandem Van de Graaff has provided steadily increasing intensity of gold ion beams to the AGS Booster. However, the gold beam injection efficiency at the Booster has been found to decrease with the rising intensity of injected beams. As the result, for Tandem beams of the highest intensity, the Booster late intensity is lower than with slightly lower intensity Tandem beam. In this article, the authors present two experiments associated with the Booster injection efficiency and beam intensity. One experiment looks at the Booster injection efficiency by adjusting the Tandem beam intensity, and another looks at the beam life time while scraping the beam in the Booster. The studies suggest that the gold beam injection efficiency at the AGS Booster is related to the beam loss in the ring, rather than the intensity of injected beam or circulating beam. A close look at the effect of the lost gold ion at the Booster injection leads to the prediction that the lost gold ion creates large number of positive ions, and even larger number of electrons. The lost gold beam is also expected to create large numbers of neutral particles. In 1998 heavy ion run, the production of positive ions and electrons due to the lost gold beam has been observed. Also the high vacuum pressure due to the beam loss, presumably because of the neutral particles it created, has been measured. These results will be reported elsewhere.

ZHANG,S.Y.; AHRENS,L.A.

1998-06-22T23:59:59.000Z

159

UV laser ablation of parylene films from gold substrates  

SciTech Connect

Parylene films, coating gold substrates, were removed by laser ablation using 248 nm light from an excimer laser. Each sample was processed by a different number of pulses in one of three different environments: air at atmospheric pressure, nitrogen at atmospheric pressure, and vacuum. The laser-induced craters were analyzed by optical microscopy and x-ray photoelectron spectroscopy. Multi-pulse ablation thresholds of gold and parylene were estimated.

O. R. Musaev, P. Scott, J. M. Wrobel, and M. B. Kruger

2009-11-19T23:59:59.000Z

160

Determination of far-field antenna patterns from near-field measurements  

E-Print Network (OSTI)

Abstracf-In many cases, it is impractical or impossible to make antenna patfern measurements on a conventional far-field range; the distance to the radiating far field may be too long, it may be impractical to move the antenna from its operating environment to an antenna range, or the desired amount of pattern data may require too much time on a far-field range. For these and other reasons, it is often desirable or necessary to determine far-field antenna patterns from measurements made in the radiating near-field region; three basic techniques for accomplishing this have proven to be successful. In the 6rst technique, the aperture phase and amplitude distributions are sampled by a scanning field probe, and then the measured distributions are transformed to the far field. In the second technique, a plane wave that is approximately uniform in amplitude is created by a feed and large reflector in the immediate vicinity of the test antenna. And in the third technique, the test antenna is focused within the radiating near-field region, patterns are measured at the reduced range, and then the antenna is refocused to infinity. Each of these techniques is discussed, and the various advantages and limitations of each technique are presented.

Richard C. Johnson; H. Allen Ecrer; J. Searcy Hollis

1973-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Characterization of Electrodeposited Technetium on Gold Foil  

Science Conference Proceedings (OSTI)

The reduction and electrodeposition of TcO{sub 4}{sup -} on a smooth gold foil electrode with an exposed area of 0.25 cm{sup 2} was performed in 1 M H{sub 2}SO{sub 4} supporting electrolyte using bulk electrolysis with a constant current density of 1.0 A/cm{sup 2} at a potential of -2.0 V. Significant hydrogen evolution accompanied the formation of Tc deposits. Tc concentrations consisted of 0.01 M and 2 x 10{sup -3} M and were electrodeposited over various times. Deposited fractions of Tc were characterized by powder x-ray diffraction, x-ray absorption fine structure spectroscopy, and scanning electron microscopy with the capability to measure semiquantitative elemental compositions by energy-dispersive x-ray emission spectroscopy. Results indicate the presence of Tc metal on all samples as the primary electrodeposited constituent for all deposition times and Tc concentrations. Thin films of Tc have been observed followed by the formation of beads that are removable by scratching. After 2000, the quantity of Tc removed from solution and deposited was 0.64 mg Tc per cm{sup 2}. The solution, after electrodeposition, showed characteristic absorbances near 500 nm corresponding to hydrolyzed Tc(IV) produced during deposition of Tc metal. No detectable Tc(IV) was deposited to the cathode.

Mausolf, Edward; Poineau, Frederic; Hartmann, Thomas; Droessler, Janelle; Czerwinski, Ken (UNLV)

2011-11-17T23:59:59.000Z

162

High-frequency electric field measurement using a toroidal antenna  

DOE Patents (OSTI)

A simple and compact method and apparatus for detecting high frequency electric fields, particularly in the frequency range of 1 MHz to 100 MHz, uses a compact toroidal antenna. For typical geophysical applications the sensor will be used to detect electric fields for a wide range of spectrum starting from about 1 MHz, in particular in the frequency range between 1 to 100 MHz, to detect small objects in the upper few meters of the ground. Time-varying magnetic fields associated with time-varying electric fields induce an emf (voltage) in a toroidal coil. The electric field at the center of (and perpendicular to the plane of) the toroid is shown to be linearly related to this induced voltage. By measuring the voltage across a toroidal coil one can easily and accurately determine the electric field.

Lee, Ki Ha (Lafayette, CA)

2002-01-01T23:59:59.000Z

163

Porcelain-coated antenna for radio-frequency driven plasma source  

SciTech Connect

A new porcelain-enamel coated antenna creates a clean plasma for volume or surface-conversion ion sources. The porcelain-enamel coating is hard, electrically insulating, long lasting, non fragile, and resistant to puncture by high energy ions in the plasma. Plasma and ion production using the porcelain enamel coated antenna is uncontaminated with filament or extraneous metal ion because the porcelain does not evaporate and is not sputtered into the plasma during operation. Ion beams produced using the new porcelain-enamel coated antenna are useful in ion implantation, high energy accelerators, negative, positive, or neutral beam applications, fusion, and treatment of chemical or radioactive waste for disposal. For ion implantation, the appropriate species ion beam generated with the inventive antenna will penetrate large or small, irregularly shaped conducting objects with a narrow implantation profile.

Leung, Ka-Ngo (Hercules, CA); Wells, Russell P. (Kensington, CA); Craven, Glen E. (Fremont, CA)

1996-01-01T23:59:59.000Z

164

Microsoft Word - CX-AlveyPascoSnoh-HF-Antenna_WEB.docx  

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

1, 2013 1, 2013 REPLY TO ATTN OF: KEPR-4 SUBJECT: Environmental Clearance Memorandum Roger Thomas Project Manager - TECT-CSB-1 Proposed Action: Install high frequency antennas at Bonneville Power Administration (BPA) maintenance headquarters PP&A Project No.: 2,600 Categorical Exclusion Applied (from Subpart D, 10 C.F.R. Part 1021): B1.19 Microwave, meteorological, and radio towers Locations: Multiple; including BPA's Alvey, Pasco, and Snohomish maintenance headquarters Proposed by: BPA Description of the Proposed Action: BPA proposes to install high frequency radio antennas within existing BPA maintenance headquarters sites. Antenna design varies by site, but generally the small antennas will be mounted between 20-35 feet above the ground using one or

165

Mid-Infrared Single-Photon Detection Using Superconducting Nanowires Integrated with Nano-Antennae  

E-Print Network (OSTI)

We present some major challenges of mid-infrared superconducting nanowire single-photon detector technology and our device design with nano-antenna integration to address these challenges.

Berggren, Karl K.

166

Superconducting nanowire single-photon detectors integrated with optical nano-antennae  

E-Print Network (OSTI)

Optical nano-antennae have been integrated with semiconductor lasers to intensify light at the nanoscale and photodiodes to enhance photocurrent. In quantum optics, plasmonic metal structures have been used to enhance ...

Berggren, Karl K.

167

Propagation models for multiple-antenna systems : methodology, measurements and statistics  

E-Print Network (OSTI)

The trend in wireless communications is towards utilization of multiple antenna systems. While techniques such as beam-forming and spatial diversity have been implemented for some time, the emergence of Multiple-Input ...

Herring, Keith, 1981-

2008-01-01T23:59:59.000Z

168

Spaced-Antenna Interferometry to Measure Crossbeam Wind, Shear, and Turbulence: Theory and Formulation  

Science Conference Proceedings (OSTI)

The theory of measuring crossbeam wind, shear, and turbulence within the radars resolution volume V6 is described. Spaced-antenna weather radar interferometry is formulated for such measurements using phased-array weather radar. The formulation ...

Guifu Zhang; Richard J. Doviak

2007-05-01T23:59:59.000Z

169

Power-Bandwidth Tradeoff in Dense Multi-Antenna Relay Networks  

E-Print Network (OSTI)

We consider a dense fading multi-user network with multiple active multi-antenna source-destination pair terminals communicating simultaneously through a large common set of $K$ multi-antenna relay terminals in the full spatial multiplexing mode. We use Shannon-theoretic tools to analyze the tradeoff between energy efficiency and spectral efficiency (known as the power- bandwidth tradeoff) in meaningful asymptotic regimes of signal-to-noise ratio (SNR) and network size. We design linear distributed multi-antenna relay beamforming (LDMRB) schemes that exploit the spatial signature of multi-user interference and characterize their power-bandwidth tradeoff under a system wide power constraint on source and relay transmissions. The impact of multiple users, multiple relays and multiple antennas on the key performance measures of the high and low SNR regimes is investigated in order to shed new light on the possible reduction in power and bandwidth requirements through the usage of such practical relay cooperation...

Oyman, Ozgur

2007-01-01T23:59:59.000Z

170

A 32 m Parabolic Antenna in Peru At 3,370m of Altitude  

E-Print Network (OSTI)

At the altitude of 3,370 m on the Peruvian Andes, a 32m antenna owned by the telecommunications company Telefonica del Peru will be transformed to a Radio Telescope, it would be transferred to the Geophysical Institute of Peru (IGP). The parabolic antenna was constructed in 1984 by Nippon Electric Co. (NEC) and worked as an INTELSAT station until 2000. A team of the National Observatory of Japan (NAOJ) evaluated the antenna in 2003 and reported its availability to be used as a Radio Telescope. In collaboration of the NAOJ a 6.7 GHz receiver is under construction and will be installed within this year. Initially the telescope as a single dish will monitor and survey Methanol Maser of YSO, higher frequencies equipment and VLBI instruments will be considered. The antenna will be managed by the IGP and used by universities in Peru, becoming a VLBI station will be a grate contribution to astronomy and geodetic community.

J. Ishitsuka; M. Ishitsuka; N. Kaifu; S. Miyama; M. Inoue; M. Tsuboi; M. Ohishi; K. Fujisawa; T. Kasuga; K. Miyazawa; S. Horiuchi

2005-01-04T23:59:59.000Z

171

The Influence of Antenna Radome on Weather Radar Calibration and Its Real-Time Assessment  

Science Conference Proceedings (OSTI)

Operational weather radars are usually equipped with a radome to reduce the wind load on the antenna and to allow continuous operation under bad weather conditions. The study is focused on quantifying the impact on radar polarimetric measurements ...

E. Gorgucci; R. Bechini; L. Baldini; R. Cremonini; V. Chandrasekar

2013-04-01T23:59:59.000Z

172

Human equivalent antenna model for HF exposures: analytical versus numerical approach  

Science Conference Proceedings (OSTI)

In this paper, the human exposure to HF radiation is analyzed using the simplified human equivalent antenna model featuring analytical and numerical approach, respectively. Namely, the human body is represented by an equivalent receiving straight thin ...

Dragan Poljak; Silvestar Sesnic; Ivana Zulim

2009-09-01T23:59:59.000Z

173

Multiplexing, scheduling, and multicasting strategies for antenna arrays in wireless networks  

E-Print Network (OSTI)

A transmitter antenna array has the ability to direct data simultaneously to multiple receivers within a wireless network, creating potential for a more integrated view of algorithmic system components. In this thesis, ...

Lopez, Michael J. (Michael John), 1972-

2002-01-01T23:59:59.000Z

174

For Spitzer building, green is gold | Princeton Plasma Physics Lab  

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

For Spitzer building, green is gold For Spitzer building, green is gold By Patti Wieser May 26, 2011 Tweet Widget Facebook Like Google Plus One The Lyman Spitzer Building. (Photo by Elle Starkman, PPPL Office of Communications) The Lyman Spitzer Building. Gallery: Keith Rule (Photo by Elle Starkman, PPPL Office of Communications) Keith Rule Shawn Connolly, Adam Cohen, William Gervasi. (Photo by Elle Starkman, PPPL Office of Communications) Shawn Connolly, Adam Cohen, William Gervasi. The Lyman Spitzer Building, the main administration building at the U.S. Department of Energy's Princeton Plasma Physics Laboratory (PPPL), has been certified LEED gold, one of the highest environmental distinctions for buildings. "We are delighted to receive this designation for the Lyman Spitzer Building - or LSB - from the U.S. Green Building Council," said Adam

175

Going for the Gold (Computer) | Department of Energy  

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

for the Gold (Computer) for the Gold (Computer) Going for the Gold (Computer) March 3, 2009 - 4:00am Addthis John Lippert Last summer I decided to bite the bullet and buy a new computer. My old one was getting sluggish. I had purchased the original one about 10 years earlier and had upgraded various components every several years. But it was still showing its age. I wanted another desktop. It was a no brainer that it had to be an ENERGY STAR® model, both computer and monitor. But selecting one was not that simple. You see, I know that the ENERGY STAR criteria are constantly changing, requiring manufacturers to make their units more and more efficient. The stricter ENERGY STAR Version 5.0 Specification for Computers, for example, will go into effect on July 1, 2009. Though the new

176

Fresh Air That's as Good as Gold | Department of Energy  

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

Fresh Air That's as Good as Gold Fresh Air That's as Good as Gold Fresh Air That's as Good as Gold July 8, 2013 - 5:25pm Addthis Brookhaven Lab physicists Peter Sutter, Eli Sutter,and Xiao Tong (left to right) with one of the Center for Functional Nanomaterials instruments used to characterize the new nanoparticle structures. | Photo courtesy of Brookhaven National Lab. Brookhaven Lab physicists Peter Sutter, Eli Sutter,and Xiao Tong (left to right) with one of the Center for Functional Nanomaterials instruments used to characterize the new nanoparticle structures. | Photo courtesy of Brookhaven National Lab. Charles Rousseaux Charles Rousseaux Senior Writer, Office of Science What are the key facts? Car engines produce traces of carbon monoxide, but they use catalytic converters to reduce that pollutant and others, such as nitrogen

177

Argonne CNM Highlight: Damping of acoustic vibrations in gold nanoparticles  

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

Damping of acoustic vibrations in gold nanoparticles Damping of acoustic vibrations in gold nanoparticles Nanopatterning of STO Vibrations in nanostructures offer applications in molecular-scale biological sensing and ultrasensitive mass detection. To approach single-atom sensing, it is necessary to reduce the dimensions of the structures to the nanometer scale while preserving long-lived vibrations. This requires an understanding of how vibrations in nanoscale objects are damped - or lose their energy to the fluid surroundings and within themselves. Researchers have used fast laser pulses to produce and probe high-frequency vibrations in metal nanoparticles. However, significant variations in particle dimensions complicate measurements. By studying bipyramid-shaped gold nanoparticles with highly uniform sizes

178

Time-dependent Protein-directed Growth of Gold Nanoparticles within a Single Crystal of Lysozyme  

SciTech Connect

Gold nanoparticles are useful in biomedical applications due to their distinct optical properties and high chemical stability. Reports of the biogenic formation of gold colloids from gold complexes has also led to an increased level of interest in the biomineralization of gold. However, the mechanism responsible for biomolecule-directed gold nanoparticle formation remains unclear due to the lack of structural information about biological systems and the fast kinetics of biomimetic chemical systems in solution. Here we show that intact single crystals of lysozyme can be used to study the time-dependent, protein-directed growth of gold nanoparticles. The protein crystals slow down the growth of the gold nanoparticles, allowing detailed kinetic studies to be carried out, and permit a three-dimensional structural characterization that would be difficult to achieve in solution. Furthermore, we show that additional chemical species can be used to fine-tune the growth rate of the gold nanoparticles.

H Wei; Z Wang; J Zhang; S House; Y Gao; L Yang; H Robinson; L Tan; H Xing; C Hou

2011-12-31T23:59:59.000Z

179

Time-dependent, protein-directed growth of gold nanoparticles within a single crystal of lysozyme  

SciTech Connect

Gold nanoparticles are useful in biomedical applications due to their distinct optical properties and high chemical stability. Reports of the biogenic formation of gold colloids from gold complexes has also led to an increased level of interest in the biomineralization of gold. However, the mechanism responsible for biomolecule-directed gold nanoparticle formation remains unclear due to the lack of structural information about biological systems and the fast kinetics of biomimetic chemical systems in solution. Here we show that intact single crystals of lysozyme can be used to study the time-dependent, protein-directed growth of gold nanoparticles. The protein crystals slow down the growth of the gold nanoparticles, allowing detailed kinetic studies to be carried out, and permit a three-dimensional structural characterization that would be difficult to achieve in solution. Furthermore, we show that additional chemical species can be used to fine-tune the growth rate of the gold nanoparticles.

Wei, H.; Robinson, H.; Wang, Z.; Zhang, J.; House, S.; Gao, Y.-G.; Yang, L.; Tan, L. H.; Xing, H.; Hou, C.; Robertson, I. M.; Zuo, J.-M.; Lu, Y.

2011-01-30T23:59:59.000Z

180

Stress and resistivity analysis of electrodeposited gold films for MEMS application  

Science Conference Proceedings (OSTI)

Electroplated gold films have attracted much attention in recent years because of its desirable properties for microsystems applications such as resistance to oxidation, low electrical resistance, overall chemical inertness and low processing temperature. ... Keywords: Gold films, Grain growth, Thin films

Subhadeep Kal; A. Bagolini; B. Margesin; M. Zen

2006-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Interaction of amphiphilic gold nanoparticles with lipid membranes and their application to cancer radiotherapy  

E-Print Network (OSTI)

Striped gold nanoparticles (NPs), inorganic particles protected by an amphiphilic mixed organic ligand shell, are the most recent and potent evolution of gold nanoparticle intracellular delivery vectors. Here we propose ...

Yang, Yu-Sang

2013-01-01T23:59:59.000Z

182

Simple synthesis and enhanced performance of graphene oxide-gold composites  

Science Conference Proceedings (OSTI)

Graphene oxide-gold composites were prepared by one-step reaction in aqueous solution, where the gold nanoparticles were deposited on the graphene oxide during their synthesis process. Transmission electron morphology, X-ray diffraction, Roman spectra, ...

Min Song; Lulu Yu; Yimin Wu

2012-01-01T23:59:59.000Z

183

The Mineralogy and Predictive Metallurgy of Major Types of Gold Ores  

Science Conference Proceedings (OSTI)

Agnico-Eagle Laronde Plant: Metallurgical Challenges Present and Future An Alternative Automated Electron Beam Technology for Gold Characterization.

184

Fabrication of Gold-Platinum Nanoalloy by High-Intensity Laser ...  

Science Conference Proceedings (OSTI)

After irradiation, absorption peak arise from surface plasmon resonance of gold nanoparticles ... Engineering Shapes in Nanotechnology: Helicity on Demand.

185

welcome to university residences Boiler Gold Rush Check-In...........................Saturday, August 13 and  

E-Print Network (OSTI)

welcome to university residences #12;Boiler Gold Rush Check-In...........................Saturday, August 13 and Sunday, August 14, 2011 Boiler Gold Rush residence hall systems in the United States. weLcomE! 1 #12;Boiler GoLD Rush ParticiPants Your regular

Fernández-Juricic, Esteban

186

Study of anion adsorption at the gold--aqueous solution interface by atomic force microscopy  

SciTech Connect

The forces between a gold coated colloidal silica sphere and a pure gold plate have been measured in aqueous solution as a function of electrolyte concentration using an atomic force microscope (AFM). Forces in the presence of gold(III) chloride (HAuCl[sub 4]), sodium chloride, and trisodium citrate were recorded as a function of concentration. Each of these anion species is present during the formation of colloidal gold by the reduction of gold(III) chloride with trisodium citrate. In pure water the force between the gold surfaces was exclusively attractive. In sodium chloride or trisodium citrate solution a repulsive interaction was observed which is attributed to the adsorption of these anions at the gold/water interface. The observed interaction force in gold(III) chloride solution was always attractive, the surface potential never exceeding 20 mV. Data taken in aqueous solutions of citrate and chloride ions together suggested that the citrate ions were preferentially adsorbed to the surface of the gold. Addition of gold(III) chloride to the AFM liquid cell after the pre-adsorption of citrate anions caused the force of interaction to change from a repulsvie force to an attractive one initially as the gold(III) chloride was reduced to gold by the citrate anions. 33 refs., 11 figs.

Biggs, S.; Mulvaney, P.; Grieser, F. (Univ. of Melbourne (Australia)); Zukoski, C.F. (Univ. of Illinois, Urbana, IL (United States))

1994-10-05T23:59:59.000Z

187

PROCESS FOR THE CONCENTRATION OF ORES CONTAINING GOLD AND URANIUM  

DOE Patents (OSTI)

ABS>A process is described for concentrating certain low grade uranium and gold bearing ores, in which the gangue is mainly quartz. The production of the concentrate is accomplished by subjecting the crushed ore to a froth floatation process using a fatty acid as a collector in conjunction with a potassium amyl xanthate collector. Pine oil is used as the frothing agent.

Gaudin, A.M.; Dasher, J.

1958-06-10T23:59:59.000Z

188

Booster gold beam injection efficiency and beam loss  

SciTech Connect

The Relativistic Heavy Ion Collider (RHIC) at the BNL requires the AGS to provide gold beam with the intensity of 10{sup 9} ions per bunch. Over the years, the Tandem Van de Graaff has provided steadily increasing intensity of gold ion beams to the AGS Booster. However, the gold ion beam injection efficiency at the Booster has been found to decrease with the rising intensity of injected beams. As the result, for Tandem beams of the highest intensity, the Booster late intensity is lower than with slightly lower intensity Tandem beam. In this article, the authors present two experiments associated with the Booster injection efficiency and beam intensity. One experiment looks at the Booster injection efficiency by adjusting the Tandem beam intensity, and another looks at the beam life time while scraping the beam in the Booster. The studies suggest that the gold beam injection efficiency at the AGS Booster is related to the beam loss in the ring, rather than the intensity of injected beam or circulating beam.

Zhang, S.Y.; Ahrens, L.A.

1998-08-01T23:59:59.000Z

189

Enhanced radiative heat transfer between nanostructured gold plates  

E-Print Network (OSTI)

We compute the radiative heat transfer between nanostructured gold plates in the framework of the scattering theory. We predict an enhancement of the heat transfer as we increase the depth of the corrugations while keeping the distance of closest approach fixed. We interpret this effect in terms of the evolution of plasmonic and guided modes as a function of the grating's geometry.

R. Gurout; J. Lussange; F. S. S. Rosa; J. -P. Hugonin; D. A. R. Dalvit; J. -J. Greffet; A. Lambrecht; S. Reynaud

2012-03-07T23:59:59.000Z

190

Dendritic functionalization of monolayer-protected gold nanoparticles  

SciTech Connect

This paper describes the facile synthesis of nanoparticle-cored dendrimers (NCDs) and nanoparticle megamers from monolayer-protected gold clusters using either single or multi-step reactions. First, 11-mercaptoundecanoic acid/hexanethiolate-protected gold clusters were synthesized using the Schiffrin reaction followed by the ligand place-exchange reaction. A convergent approach for the synthesis of nanoparticle-cored dendrimers uses a single step reaction that is an ester coupling reaction of hydroxy-functionalized dendrons with carboxylic acid-functionalized gold clusters. A divergent approach, which is based on multi-step reactions, employs the repetition of an amide coupling reaction and a Michael addition reaction to build polyamidoamine dendritic architectures around a nanoparticle core. Nanoparticle megamers, which are large dendrimer-induced nanoparticle aggregates with an average diameter of more than 300 nm, were prepared by the amide coupling reaction between polyamiodoamine [G-2] dendrimers and carboxylic acid-functionalized gold clusters. {sup 1}H NMR spectroscopy, FT-IR spectroscopy, thermogravimetric analysis (TGA), and transmission electron microscopy (TEM) were used for the characterization of these hybrid nanoparticles.

Cutler, Erin C. [Department of Chemistry, Western Kentucky University, Bowling Green, Kentucky 42101 (United States); Lundin, Erik [Department of Chemistry, Western Kentucky University, Bowling Green, Kentucky 42101 (United States); Garabato, B. Davis [Department of Chemistry, Western Kentucky University, Bowling Green, Kentucky 42101 (United States); Choi, Daeock [Department of Chemistry, Sunchon National University, Suncheon 540-742 (Korea, Republic of); Shon, Young-Seok [Department of Chemistry, Western Kentucky University, Bowling Green, Kentucky 42101 (United States)]. E-mail: young.shon@wku.edu

2007-06-05T23:59:59.000Z

191

Ion energy and plasma measurements in the near field of an ICRF antenna  

SciTech Connect

Plasma properties and ion energies have been measured in the near field of an ICRF antenna to determine the effects of rf fields in a magnetized plasma sheath on the energy of ions incident on the surface of the Faraday shield. A resonant loop antenna with a two- tier Faraday shield was used on the RF Test Facility at Oak Ridge National Laboratory (ORNL). The magnetic field near the antenna is /approximately/2 kG, and the plasma density is /approximately/10/sup 11/ cm/sup /minus/3/ with an electron temperature of 6-10 eV. The time-varying floating potential was measured with a capacitively coupled probe, and the time-averaged electron temperature, electron density, and floating potential were measured with a Langmuir probe. Both probes were scanned poloidally in front of the antenna, parallel to the current strap. Diagnostics for measuring ion energies included a gridded energy analyzer located directly below the antenna. Measured ion energies are compared with predictions from a computational model for determining the energy and angular distribution of ions incident on a surface in a magnetized plasma sheath with a time-varying plasma potential. 7 refs., 3 figs.

Caughman, J.B.O. II; Ruzic, D.N.; Hoffman, D.J.

1989-01-01T23:59:59.000Z

192

Graphene-based nano-antennas for electromagnetic nanocommunications in the terahertz band  

E-Print Network (OSTI)

AbstractNanotechnology is enabling the development of devices in a scale ranging from one to a few hundred nanometers. Coordination and information sharing among these nano-devices will lead towards the development of future nanonetworks, boosting the range of applications of nanotechnology in the biomedical, environmental and military fields. Despite the major progress in nano-device design and fabrication, it is still not clear how these atomically precise machines will communicate. Recently, the advancements in graphene-based electronics have opened the door to electromagnetic communications in the nanoscale. In this paper, a new quantum mechanical framework is used to analyze the properties of Carbon Nanotubes (CNTs) as nano-dipole antennas. For this, first the transmission line properties of CNTs are obtained using the tight-binding model as functions of the CNT length, diameter, and edge geometry. Then, relevant antenna parameters such as the fundamental resonant frequency and the input impedance are calculated and compared to those of a nano-patch antenna based on a Graphene Nanoribbon (GNR) with similar dimensions. The results show that for a maximum antenna size in the order of several hundred nanometers (the expected maximum size for a nano-device), both a nano-dipole and a nano-patch antenna will be able to radiate electromagnetic waves in the terahertz band (0.1-10.0 THz). I.

Josep Miquel Jornet; Ian F. Akyildiz

2010-01-01T23:59:59.000Z

193

Bandwidth provisioning in infrastructure-based wireless networks employing directional antennas  

Science Conference Proceedings (OSTI)

Motivated by the widespread proliferation of wireless networks employing directional antennas, we study the problem of provisioning bandwidth in such networks. Given a set of subscribers and one or more access points possessing directional antennas, we formalize the problem of orienting these antennas in two fundamental settings: (1) subscriber-centric, where the objective is to fairly allocate bandwidth among the subscribers and (2) provider-centric, where the objective is to maximize the revenue generated by satisfying the bandwidth requirements of subscribers. For both the problems, we first design algorithms for a network with only one access point working under the assumption that the number of antennas does not exceed the number of noninterfering channels. Using the well-regarded lexicographic max-min fair allocation as the objective for a subscriber-centric network, we present an optimum dynamic programming algorithm. For a provider-centric network, the allocation problem turns out to be NP-hard. We present a greedy heuristic based algorithm that guarantees almost half of the optimum revenue. We later enhance both these algorithms to operate in more general networks with multiple access points and no restrictions on the relative numbers of antennas and channels. A simulation-based evaluation using OPNET demonstrates the efficacy of our approaches and provides us further in insights into these problems.

Hasiviswanthan, Shiva [Los Alamos National Laboratory; Zhao, Bo [PENN STATE UNIV.; Vasudevan, Sudarshan [UNIV OF MASS AMHERST; Yrgaonkar, Bhuvan [PENN STATE UNIV.

2009-01-01T23:59:59.000Z

194

Argonne CNM Highlight: Gold nanoparticles create visible-light catalysis in  

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

Silver chloride-gold nanoparticles Gold-coated silver chloride (AgCl) nanowires at the microscopic level. In the News United Press International | PhysOrg.com | R&D Magazine| Nanotechnology Now | Photonics.com Gold nanoparticles create visible-light catalysis in nanowires A two-step approach has been developed within the Nanophotonics Group to synthesize AgCl nanowires decorated with gold nanoparticles by using silver nanowires as chemical templates. In the first step, the silver nanowires are chemically oxidized and converted to AgCl nanowires. In the second step, ions generated in the first step reduce gold precursors (e.g., NaAuCl4) to deposit gold nanoparticles on the AgCl nanowire surfaces, resulting in the formation of AgCl:gold composite nanowires. Because of the

195

Argonne CNM Highlight: Solvent-Mediated End-to-End Assembly of Gold  

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

Solvent-Mediated End-to-End Assembly of Gold Nanorods Solvent-Mediated End-to-End Assembly of Gold Nanorods gold nanorods Transmission-electron-microscope image of 70-nm-long gold nanorods assembled end to end via solvent-mediated interactions. CNM scientists have developed a new method for the controlled end-to-end assembly of rod-shaped gold nanoparticles. The nanoparticles are synthesized chemically using an established technique, producing high-quality gold nanorods with lengths of approximately 70 nm and diameters of approximately 15 nm, stabilized in water by hydrophilic surfactant molecules. The sides of the rods are better protected by the surfactants than the ends, so that when additional ligand molecules that bind to gold are added to the solution, they preferentially attach to the ends of the rods. If these ligands are hydrophobic, then the rods will

196

BROADBAND ANTENNA MATCHING NETWORK DESIGN AND APPLICATION FOR RF PLASMA ION SOURCE  

SciTech Connect

The RF ion source at Spallation Neutron Source has been upgraded to meet higher beam power requirement. One important subsystem for efficient operation of the ion source is the 2MHz RF impedance matching network. The real part of the antenna impedance is very small and is affected by plasma density for 2MHz operating frequency. Previous impedance matching network for the antenna has limited tuning capability to cover this potential variation of the antenna impedance since it employed a single tuning element and an impedance transformer. A new matching network with two tunable capacitors has been built and tested. This network can allow precision matching and increase the tunable range without using a transformer. A 5-element broadband matching network also has been designed, built and tested. The 5-element network allows wide band matching up to 50 kHz bandwidth from the resonance center of 2 MHz. The design procedure, simulation and test results are presented.

Shin, Ki [ORNL; Kang, Yoon W [ORNL; Piller, Chip [ORNL; Fathy, Aly [University of Tennessee, Knoxville (UTK)

2011-01-01T23:59:59.000Z

197

Design of a mechanically actuated RF grounding system for the ITER ICRH antenna  

E-Print Network (OSTI)

In the ITER equatorial ports containing ICRH antennas, parasitic electrical resonances can be excited in the nominal 20 mm clearance gap between the port walls and the plug contained within it. RF calculations have established that these resonances can be effectively mitigated by a series of suitably located electrically conducting contacts between the port and plug. These contacts must allow installation and removal of the antenna but must also make reliable electrical contact during antenna operation. In addition, the contacts must be compliant enough to survive deflection of the port during seismic and disruption events without transmitting large forces to the vacuum vessel. The distance to be spanned is subject to significant uncertainty, due to the large manufacturing tolerances of the surrounding components, and this also must be considered during the design process. This paper outlines progress made in the design of the grounding system, as well as detailing a number of concepts which have been investi...

Hancock, D; Beaumont, B; Dumortier, P; Durodie, F; Kyrytsya, V; Louche, F; McKinley, R; Nicholls, K

2013-01-01T23:59:59.000Z

198

An Atom-Wide Antennae Created from Difference-Making Defects | Department  

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

An Atom-Wide Antennae Created from Difference-Making Defects An Atom-Wide Antennae Created from Difference-Making Defects An Atom-Wide Antennae Created from Difference-Making Defects March 7, 2012 - 3:35pm Addthis Take advantage of microwave microscopy, researchers were able to locate graphene islands on graphene. “Point defects” locally enhanced the graphene’s ability to transform waves of light into electronic signals. | Photo courtesy of Oak Ridge National Laboratory. Take advantage of microwave microscopy, researchers were able to locate graphene islands on graphene. "Point defects" locally enhanced the graphene's ability to transform waves of light into electronic signals. | Photo courtesy of Oak Ridge National Laboratory. Charles Rousseaux Charles Rousseaux Senior Writer, Office of Science

199

Analysis of the Effect of Ground Plane Size on the Performance of a Probe-fed Cavity Resonator Microstrip Antenna  

Science Conference Proceedings (OSTI)

In this paper, a probe-fed rectangular microstrip patch antenna with partially reflective superstrate at terahertz frequency (600 GHz) has been analyzed and simulated. The analysis of the partially reflective surface shows the highly reflective property ... Keywords: Directivity, Frequency-selective-surface, Probe-fed-microstrip antenna, Terahertz spectrum

Kumud Ranjan Jha; G. Singh

2013-07-01T23:59:59.000Z

200

70 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 59, NO. 1, JANUARY 2011 Analysis and Characterization of a Multipole  

E-Print Network (OSTI)

70 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 59, NO. 1, JANUARY 2011 Analysis that operates at 5.5 GHz and is low-profile, low-cost and easy to fabricate. The design consists of a three-layer structure imple- menting two slot-coupled patch antennas. Varactor diodes are used to load the patches

Hum, Sean Victor

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Guided Self-Assembly of Gold Thin Films  

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

Guided Self-Assembly of Gold Thin Films Print Guided Self-Assembly of Gold Thin Films Print Nanoparticles-man-made atoms with unique optical, electrical, and mechanical properties-have become key components in many fields of science. If nanoparticles could be coaxed into routinely assembling themselves into predictable complex structures and hierarchical patterns, devices could be mass-produced that are one thousand times smaller than today's microtechnologies. Berkeley Lab and UC Berkeley scientists have made progress toward this goal, successfully directing the self--assembly of nanoparticles into device-ready thin films, which have potential applications in fields ranging from computer memory storage to energy harvesting and storage, from catalysis to light management, and into the emerging new field of plasmonics.

202

Gold Camp, Arizona: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Gold Camp, Arizona: Energy Resources Gold Camp, Arizona: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 33.3786732°, -111.4395128° 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":33.3786732,"lon":-111.4395128,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

203

Guided Self-Assembly of Gold Thin Films  

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

Guided Self-Assembly of Gold Thin Films Print Guided Self-Assembly of Gold Thin Films Print Nanoparticles-man-made atoms with unique optical, electrical, and mechanical properties-have become key components in many fields of science. If nanoparticles could be coaxed into routinely assembling themselves into predictable complex structures and hierarchical patterns, devices could be mass-produced that are one thousand times smaller than today's microtechnologies. Berkeley Lab and UC Berkeley scientists have made progress toward this goal, successfully directing the self--assembly of nanoparticles into device-ready thin films, which have potential applications in fields ranging from computer memory storage to energy harvesting and storage, from catalysis to light management, and into the emerging new field of plasmonics.

204

Guided Self-Assembly of Gold Thin Films  

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

Guided Self-Assembly of Gold Thin Films Print Guided Self-Assembly of Gold Thin Films Print Nanoparticles-man-made atoms with unique optical, electrical, and mechanical properties-have become key components in many fields of science. If nanoparticles could be coaxed into routinely assembling themselves into predictable complex structures and hierarchical patterns, devices could be mass-produced that are one thousand times smaller than today's microtechnologies. Berkeley Lab and UC Berkeley scientists have made progress toward this goal, successfully directing the self--assembly of nanoparticles into device-ready thin films, which have potential applications in fields ranging from computer memory storage to energy harvesting and storage, from catalysis to light management, and into the emerging new field of plasmonics.

205

Guided Self-Assembly of Gold Thin Films  

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

Guided Self-Assembly of Gold Thin Films Print Guided Self-Assembly of Gold Thin Films Print Nanoparticles-man-made atoms with unique optical, electrical, and mechanical properties-have become key components in many fields of science. If nanoparticles could be coaxed into routinely assembling themselves into predictable complex structures and hierarchical patterns, devices could be mass-produced that are one thousand times smaller than today's microtechnologies. Berkeley Lab and UC Berkeley scientists have made progress toward this goal, successfully directing the self--assembly of nanoparticles into device-ready thin films, which have potential applications in fields ranging from computer memory storage to energy harvesting and storage, from catalysis to light management, and into the emerging new field of plasmonics.

206

Abraham Presents Secretary's Gold Award to Edward Teller  

Office of Scientific and Technical Information (OSTI)

26, 2002 26, 2002 Abraham Presents Secretary's Gold Award to Edward Teller LIVERMORE, CALIF. - Secretary of Energy Spencer Abraham today presented Dr. Edward Teller, Director Emeritus of the Lawrence Livermore National Laboratory, with the Secretary's Gold Award in recognition of his outstanding contributions to science and the security of the nation. The award is the Energy Department's highest honorary award and includes a plaque with citation, a medallion and a rosette. Secretary Abraham presented Dr. Teller with the award during his visit to the laboratory. "Dr. Teller is one of the giant figures of the 20th century, whose contributions to winning both World War II and the Cold War are immeasurable," Abraham told lab employees. "But I believe that Edward

207

The Formation and Binding of Gold Nanoparticles onto Wool Fibres  

SciTech Connect

This paper presents the novel use of nanosize gold with different plasmon resonance colours, as stable colourfast colourants on wool fibres for use in high quality fabrics and textiles. The gold nanoparticles are synthesised by the controlled reduction of Au{sup 3+} in the AuCl{sub 4}{sup -} complex to Au{sup 0} onto the surface of the wool where they attach to the S in the cystine amino acids in wool keratin proteins. Scanning electronmicroscopy shows the nanoparticles are present on the cuticles of the fibre surface and are concentrated at the edges of these cuticles. EDS analysis shows a strong correlation of Au with S and X-ray photoelectron spectroscopy suggests Au-S bond formation. Hence the nanogold colourants are chemically bound to the wool fibre surface and do not fade as traditional organic dyes do. A range of coloured fibres have been produced.

Johnston, James H.; Burridge, Kerstin A.; Kelly, Fern M. [School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140 (New Zealand)

2009-07-23T23:59:59.000Z

208

Joint power allocation and scheduling of multi-antenna OFDM system in broadcast channel  

Science Conference Proceedings (OSTI)

This paper considers the general multiuser down-link scheduling problem and power minimization with multiuser rate constraints. We present joint user selection algorithms for DPC, ZF-DPC, ZFBF and TDMA for multi-antenna OFDM system in broadcast channels, ...

Feng She; Wen Chen; Hanwen Luo; Tingshan Huang; Xinbing Wang

2009-06-01T23:59:59.000Z

209

Enhancing extraordinary transmission of light through a metallic nano slit with a nano cavity antenna  

E-Print Network (OSTI)

The extraordinary transmission of light through a nano slit in a metal film is enhanced by introducing a nano cavity antenna formed by a nearby metallic nano-strip over the slit opening. For a fixed wavelength, the width of the metallic nano-strip should be chosen to make the horizontal metal-insulator-metal waveguide of finite length resonant as a Fabry-Perot cavity. When such a cavity antenna is used to enhance the transmission through a non-resonant nano slit, the slit should be opened at a position with maximal magnetic field in the horizontal resonant cavity. It is shown that an optimized cavity antenna can enhance greatly the transmission of light through a non-resonant nano slit (by about 20 times) or a resonant nano slit (by 124%). The transmission spectrum of the nano slit can also be tuned by adjusting the width of the metallic nano-strip. Such a transmission enhancement with a nano cavity antenna is studied for the first time and the physical mechanism is explained.

Cui, Yanxia

2008-01-01T23:59:59.000Z

210

Analysis and design of terahertz microstrip antenna on photonic bandgap material  

Science Conference Proceedings (OSTI)

In this paper, a dielectric slab with periodic implantation of the air gaps has been analyzed. An effective dielectric permittivity of the 1-D photonic bandgap substrate material (PBG material) with host material as Polytetrafluoroethylene (PTFE) has ... Keywords: Directivity, Electromagnetic band gap, Metamaterial, Microstrip patch antenna, Radiation efficiency, Terahertz spectrum

Kumud Ranjan Jha; G. Singh

2012-12-01T23:59:59.000Z

211

EVLA Memo No. 89 The EVLA Outdoor Antenna Test Range Project  

E-Print Network (OSTI)

Projected Costs if new range equipment were purchased Total Material and Equipment costs (to date) for building test range: Funds required to complete project Total NRAO Costs (estimate) without NMT involvementEVLA Memo No. 89 The EVLA Outdoor Antenna Test Range Project: Fourth Quarter 2004, Progress Report

Groppi, Christopher

212

A Beam-Steerable Antenna Based on the Spatial Filtering Property of Hyperbolically Anisotropic Metamaterials  

E-Print Network (OSTI)

. In this case, the radiation x y z VRF Lshunt Ltune C VR Figure 1: Schematic of the antenna. Not shown. Restrictions apply. #12;x y z 11.5cm 11.5cm (a) perspective-view x z 8mm (b) side-view x y z VRF VR Lshunt (c

Balmain, Keith G.

213

High performance uncooled THz sensing structures based on antenna-coupled air-bridges  

Science Conference Proceedings (OSTI)

Antenna-coupled sensing elements, microbolometers as well as thermocouples, are potential solutions in focal plane arrays (FPA). The applications for these lightweight and low-cost sensors are specified in the field of infrared and millimeter wave imaging ... Keywords: Air-bridge, Low NEP, Room temperature operation, Surface micromachining, Terahertz detection, Thermocouple

A. Ihring; E. Kessler; U. Dillner; F. Haenschke; U. Schinkel; M. Schubert; R. Haehle; H. -G. Meyer

2012-10-01T23:59:59.000Z

214

Structure, Function and Reconstitution of Antenna Complexes of Green Photosynthetic Bacteria  

DOE Green Energy (OSTI)

Most chlorophyll-type pigments in a photosynthetic organism function as an antenna, absorbing light and transferring excitations to a photochemical reaction center where energy storage takes place by a series of chemical reactions. The green photosynthetic bacteria are characterized by large antenna complexes known as chlorosomes, in which pigment-pigment interactions are of dominant importance. The overall objective of this project is to determine the mechanisms of excitation transfer and regulation of this unique antenna system, including how it is integrated into the rest of the photosynthetic energy transduction apparatus. Techniques that are being used in this research include biochemical analysis, spectroscopy, microscopy, X-ray structural studies, and reconstitution from purified components. Our recent results indicate that the chlorosome baseplate structure, which is the membrane attachment site for the chlorosome to the membrane, is a unique pigment-protein that contains large amounts of carotenoids and small amounts of bacteriochlorophyll a. Reconstitution of directed energy transfer in chlorosomes will be carried out using purified baseplates and oligomeric pigments. The integral membrane B808-866 antenna complex from Chloroflexus aurantiacus and the Fenna-Matthews-Olson protein-reaction center complex from green sulfur bacteria will be characterized by spectroscopic and structural techniques.

Blankenship, Robert E.

2005-06-10T23:59:59.000Z

215

Amplitude calibration of a digital radio antenna array for measuring cosmic ray air showers  

E-Print Network (OSTI)

Radio pulses are emitted during the development of air showers, where air showers are generated by ultra-high energy cosmic rays entering the Earth's atmosphere. These nanosecond short pulses are presently investigated by various experiments for the purpose of using them as a new detection technique for cosmic particles. For an array of 30 digital radio antennas (LOPES experiment) an absolute amplitude calibration of the radio antennas including the full electronic chain of the data acquisition system is performed, in order to estimate absolute values of the electric field strength for these short radio pulses. This is mandatory, because the measured radio signals in the MHz frequency range have to be compared with theoretical estimates and with predictions from Monte Carlo simulations to reconstruct features of the primary cosmic particle. A commercial reference radio emitter is used to estimate frequency dependent correction factors for each single antenna of the radio antenna array. The expected received power is related to the power recorded by the full electronic chain. Systematic uncertainties due to different environmental conditions and the described calibration procedure are of order 20%.

S. Nehls; A. Hakenjos; M. J. Arts; J. Bluemer; H. Bozdog; W. A. van Cappellen; H. Falcke; A. Haungs; A. Horneffer; T. Huege; P. G. Isar; O. Kroemer

2008-02-28T23:59:59.000Z

216

ON THE USAGE OF ANTENNAS IN MIMO AND MISO INTERFERENCE CHANNELS Mariam Kaynia  

E-Print Network (OSTI)

ON THE USAGE OF ANTENNAS IN MIMO AND MISO INTERFERENCE CHANNELS Mariam Kaynia , Andrea J. Goldsmith. of Science and Technology Dept. of Electrical Engineering, Stanford University, Stanford Mobile and small), we derive upper and lower bounds to both our per- formance metrics. Moreover, the particular

Gesbert, David

217

Uplink Capacity/Coverage Analysis of WCDMA with Switched Beam Smart Antennae  

Science Conference Proceedings (OSTI)

Capacity and coverage represent, in addition to QoS, the three main requirements for W-CDMA based 3G mobile communication systems. These are conflicting requirements; i.e., optimizing one will be on the account of the other two. All three, however, depend ... Keywords: Capacity, Coverage, Interference, Smart Antenna, WCDMA

Ismat A. Aldmour; Khalid Al-Begain; Aymen I. Zreikat

2007-12-01T23:59:59.000Z

218

Global Observation of Forest and Land Cover Dynamics (GOFC-GOLD) | Open  

Open Energy Info (EERE)

of Forest and Land Cover Dynamics (GOFC-GOLD) of Forest and Land Cover Dynamics (GOFC-GOLD) Jump to: navigation, search Name Global Observation of Forest and Land Cover Dynamics (GOFC-GOLD) Agency/Company /Organization World Meteorological Organization, United Nations Educational Scientific and Cultural Organization, United Nations Environment Programme, International Council for Science, Food and Agriculture Organization of the United Nations Sector Land, Climate Focus Area Biomass, Forestry, Agriculture Topics GHG inventory Resource Type Software/modeling tools Website http://www.fao.org/gtos/gofc-g References Global Observation of Forest and Land Cover Dynamics (GOFC-GOLD)[1] Global Observation of Forest and Land Cover Dynamics (GOFC-GOLD) Screenshot "Global Observation of Forest and Land Cover Dynamics (GOFC-GOLD) is a

219

Inductance and near fields of a loop antenna in a cold magnetoplasma in the whistler frequency band  

SciTech Connect

The influence of a magnetoplasma on the inductance of a circular loop antenna oriented perpendicular to the ambient static magnetic field and operated in the whistler frequency band is studied. Based on a strict electrodynamic approach, the analytical treatment of the antenna reactance is performed for a uniform rf current distribution along the antenna wire. Calculations are made for plasma parameters and operating frequencies typical for active ionospheric experiments and laboratory rf (helicon) sources of dense magnetized plasmas. It is shown that the plasma influence on the inductance of the loop antenna remains relatively weak, even for antennas with dimensions close to half of the longitudinal whistler wavelength, when the rf field distribution in the antenna near zone is strongly different from that in vacuum. The theoretical predictions are confirmed by measurements performed on the large KROT plasma device. The results obtained are of crucial importance for the preparation of active ionospheric experiments and for the matching of loop antennas used in laboratory rf sources of dense magnetized plasmas.

Gushchin, M. E.; Korobkov, S. V.; Kostrov, A. V. [Institute of Applied Physics, 603950 Nizhny Novgorod (Russian Federation); Zaboronkova, T. M. [Department of Applied Physics, Technical University of Nizhny Novgorod, 603950 Nizhny Novgorod (Russian Federation); Krafft, C. [Laboratoire de Physique des Plasmas, Ecole Polytechnique, 91128 Palaiseau Cedex, Univ. Paris Sud, 91405 Orsay Cedex (France)

2012-09-15T23:59:59.000Z

220

A Non-Pyramidal Rectangular-to-Trough Waveguide Transition and Pattern Reconfigurable Trough Waveguide Antenna  

E-Print Network (OSTI)

Trough waveguides (TWG) have been utilized in a variety of radio frequency (RF) and other related applications including radar, the treatment of hypothermia and in the generation of plasmas. Perturbing the guided wave in these structures with blocks, rods, dielectrics, and other structures can create reconfigurable periodic line sources. These trough waveguide antennas (TWA) are then capable of providing both fixedfrequency and frequency-dependent beam steering. This was originally performed using electro-mechanical cam-and-gear mechanisms. Previous work related to the excitation of TWG and the performance of TWA topologies are limited when compared to more common antenna designs, yet they possess many desirable features that can be exploited in a modern system. This thesis will examines an S-band rectangular-to-trough waveguide transition and trough guide antenna that has been designed for broadband reconfigurable antenna applications considering as well the airflow characteristics for sensing applications. The design, fabrication, and electromagnetic performance (mode conversion, impedance matching, and antenna performance) are discussed, including the use of metallic cantilever perturbations placed along the troughguide sidewalls that are designed to provide improved impedance matching when steering the beam from the backward quadrant through broadside, towards the forward quadrant. Impedance matching techniques such as use of circular holes at the edge of each actuated cantilever are used to reduce power reflections and provide a low voltage standing wave ratio (VSWR) along the S-band. Finite element simulations will provide a demonstration of the airflow and turbulence characteristics throughout the entire structure, where the metallic cantilevers are used to manipulate the flow of air, to distribute it across the surfaces of the structure better and improve its potential for sensing operations.

Loizou, Loizos

2010-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Stable Isotopes (O, H, and S) in the Muteh Gold Deposit, Golpaygan Area, Iran  

SciTech Connect

The Muteh gold district with nine gold deposits is located in the Sanandaj-Sirjan metamorphic zone. Gold mineralization occurs in a pre-Permian complex which mainly consists of green schists, meta-volcanics, and gneiss rocks. Shear zones are the host of gold mineralization. Gold paragenesis minerals include pyrite, chalcopyrite, pyrrhotite, and secondary minerals. Pyrites occur as pre-, syn-, and post-metamorphism minerals. To determine the source of the ore-bearing fluids, fifty samples were selected for petrographical and stable isotope studies. The mean values of 12.4 per mille , and -42 per mille for {delta}{sup 18}O and {delta}D isotopes, respectively, and a mean value of 7.75 per mille of calculated fractionation factors for {delta}{sup 18}O H{sub 2}O, from quartz veins indicate that metamorphic host rocks are the most important source for the fluids and gold mineralization. Three generations of pyrite can be distinguished showing a wide range of {delta}{sup 34}S. Gold mineralization is closely associated with intense hydrothermal alteration along the ductile shear zones. The characteristics of the gold mineralization in the study area are similar to those of orogenic gold deposits elsewhere.

Abdollahi, M. J. [Shahid Bahonar University, Department of Geology (Iran, Islamic Republic of)], E-mail: kmgbkh@gmail.com; Karimpour, M. H. [Ferdousi University, Department of Geology (Iran, Islamic Republic of); Kheradmand, A. [Shahid Bahonar University, Department of Geology (Iran, Islamic Republic of); Zarasvandi, A. R. [Shahid Chamran University, Department of Geology (Iran, Islamic Republic of)

2009-06-15T23:59:59.000Z

222

Self-Assembly of Gold Nanoparticles at the Surface of Amine- and ...  

showed that there was negligible assembly of the gold nano-particles at the surface of the BNNTs (Figure 10). Both control experiments demonstrate a significant lack of

223

COMBINED FLUORESCENT AND GOLD PROBES FOR MICROSCOPIC AND MORPHOLOGICAL INVESTIGATIONS.  

SciTech Connect

Nanogold{reg_sign}, a gold cluster with a core of gold atoms 1.4 nm in diameter, has proven to be a superior probe label for electron microscopy (EM), giving both higher labeling density and improved access to previously hindered or restricted antigens. It may be visualized by autometallography (AMG) for use in light microscopy (LM): silver-and gold-amplified Nanogold detection has proven to be one of the most sensitive methods available for the detection of low copy number targets such as viral DNA in cells and tissue specimens. AMG enhancement has also made Nanogold an effective detection label in blots and gels. The following protocols will be described: Labeling of nuclear components in cells. Protocol for in situ hybridization and detection with fluorescein-Nanogold--or Cy3{trademark}-Nanogold-labeled streptavidin. Nanogold is an inert molecule, and generally does not interact with biological molecules unless a specific chemical reactivity is introduced into the molecule. Conjugates are prepared using site-specific chemical conjugation through reactive chemical functionalities introduced during Nanogold preparation, which allows the gold label to be attached to a specific site on the conjugate biomolecule. For example, a maleimido-Nanogold derivative, which is specific for thiol binding, is frequently attached to the hinge region of an antibody at a unique thiol site generated by selective reduction of a hinge disulfide. This site is remote from the antigen combining region, and the Nanogold, therefore, does not compromise target binding. Nanogold may also be prepared with specific reactivity towards amines or other unique chemical groups. This mode of attachment enables the preparation of probes labeled with both Nanogold and fluorescent labels. Different chemical reactivities are used to attach the Nanogold and the fluorescent groups to different sites in the conjugate biomolecule, as shown in Figure 7.1. In this manner, the two labels are spaced sufficiently far apart that fluorescent resonance energy transfer does not quench the fluorescent signal, and the probes may be used to label specimens for fluorescent and EM observation in a single staining procedure. This reduces the complexity of the staining procedure, allowing less specimen perturbation, and also enables a higher degree of correlation between the fluorescence and EM localization of the target, thus increasing the usefulness of the complementary data sets. Since gold and fluorescent-labeled probes are often used at different concentrations under different conditions, optimum procedures for the use of fluorescent and gold probes may entail some degree of compromise between the most appropriate conditions for the two types of probes. However, the chemical stability of the Nanogold label means that it is generally stable to a wide range of use conditions, and the following protocols have been found to be effective for labeling specimens with combined fluorescein and Nanogold-labeled antibody Fab' probes and with combined Cy3 and Nanogold-labeled streptavidin.

POWELL,R.D.HAINFELD,J.F.

2002-04-17T23:59:59.000Z

224

On adaptive transmission, signal detection and channel estimation for multiple antenna systems  

E-Print Network (OSTI)

This research concerns analysis of system capacity, development of adaptive transmission schemes with known channel state information at the transmitter (CSIT) and design of new signal detection and channel estimation schemes with low complexity in some multiple antenna systems. We first analyze the sum-rate capacity of the downlink of a cellular system with multiple transmit antennas and multiple receive antennas assuming perfect CSIT. We evaluate the ergodic sum-rate capacity and show how the sum-rate capacity increases as the number of users and the number of receive antennas increases. We develop upper and lower bounds on the sum-rate capacity and study various adaptive MIMO schemes to achieve, or approach, the sum-rate capacity. Next, we study the minimum outage probability transmission schemes in a multiple-input-single-output (MISO) flat fading channel assuming partial CSIT. Considering two special cases: the mean feedback and the covariance feedback, we derive the optimum spatial transmission directions and show that the associated optimum power allocation scheme, which minimizes the outage probability, is closely related to the target rate and the accuracy of the CSIT. Since CSIT is obtained at the cost of feedback bandwidth, we also consider optimal allocation of bandwidth between the data channel and the feedback channel in order to maximize the average throughput of the data channel in MISO, flat fading, frequency division duplex (FDD) systems. We show that beamforming based on feedback CSI can achieve an average rate larger than the capacity without CSIT under a wide range of mobility conditions. We next study a SAGE-aided List-BLAST detection scheme for MIMO systems which can achieve performance close to that of the maximum-likelihood detector with low complexity. Finally, we apply the EM and SAGE algorithms in channel estimation for OFDM systems with multiple transmit antennas and compare them with a recently proposed least-squares based estimation algorithm. The EM and SAGE algorithms partition the problem of estimating a multi-input channel into independent channel estimation for each transmit-receive antenna pair, therefore avoiding the matrix inversion encountered in the joint least-squares estimation.

Xie, Yongzhe

2004-08-01T23:59:59.000Z

225

High Dielectric Dummy Loads for ITER ICRH Antenna Laboratory Testing: Numerical Simulation of One Triplet Loading by Ferroelectric Ceramics  

SciTech Connect

Up to now, classical 'water' loads have been used for low power testing of ITER ICRH prototype or mock-up antennas . A fair description of the antenna frequency response is obtained excepted for the phasing (0 {pi} 0 {pi}). High dielectric loads are requested to improve the antenna response in the low frequency band. In view of laboratory testing, dummy loads are also required to have efficient wave spatial attenuation to avoid standing waves and to minimize load volume. In this paper, barium titanate ceramic powders mixed with water are shown to exhibit very attractive electromagnetic properties. Coupling performance of one triplet of the ITER ICRH antenna to such kind of loads is numerically investigated. The radiated wave attenuation into the load is also characterized. In spite of its frequency dispersion, 'barium titanate' loads are shown to allow the characterization of the full scale triplet frequency response on a scaled-down mock-up.

Champeaux, S.; Gouard, Ph. [CEA, DAM, DIF, F-91297 Arpajon (France); Bottollier-Curtet, H. [CEA, IRFM, F-13108 Saint-Paul-lez-Durance (France); Dumortier, P.; Koch, R.; Kyrytsya, V.; Messiaen, A. [Laboratory of Plasma Physics, Association EURATOM-Belgian State, Trilateral Euregio Cluster, Royal Military Academy, B-1000 Brussels (Belgium)

2011-12-23T23:59:59.000Z

226

Inertially stabilized platforms for SATCOM on-the-move applications : a hybrid open/closed-loop antenna pointing strategy  

E-Print Network (OSTI)

The increasing need for timely information in any environment has led to the development of mobile SATCOM terminals. SATCOM terminals seeking to achieve high data-rate communications require inertial antenna pointing to ...

Marsh, Eric Allen

2008-01-01T23:59:59.000Z

227

SiGe receiver front ends and flip-chip integrated wideband antennas for millimeter-wave passive imaging  

E-Print Network (OSTI)

SiGe wideband 77-GHz and 94-GHz front end receivers with integrated antennas for passive imaging have been designed and characterized. These front end systems exhibit wideband performance with the highest gain and lowest ...

Powell, Johnna, 1980-

2009-01-01T23:59:59.000Z

228

Study of the reaction rate of gold nanotube synthesis from sacrificial silver nanorods through the galvanic replacement method  

Science Conference Proceedings (OSTI)

An investigation was carried out about the gold nanotube synthesis via a galvanic replacement reaction. The progress of the gold nanotube synthesis was investigated using electron microscopy and UV-Vis spectroscopy. In addition, the reaction rates of ...

Sunil Kwon; Hyunbae Dong; Sang-Yup Lee

2010-01-01T23:59:59.000Z

229

Effect of Size, shape, and surface modification on cytotoxicity of gold nanoparticles to human HEp-2 and canine MDCK cells  

Science Conference Proceedings (OSTI)

There have been increasing interests in applying gold nanoparticles in biological research, drug delivery, and therapy. As the interaction of gold nanoparticles with cells relies on properties of nanoparticles, the cytotoxicity is complex and still under ...

Yinan Zhang; Dan Xu; Wenqin Li; Jun Yu; Yu Chen

2012-01-01T23:59:59.000Z

230

Solving the Unsovlable: The Nanostructure of Gold at 1.1 Å Resolution  

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

Solving the Unsovlable: The Nanostructure of Gold at 1.1 Å Resolution Print Solving the Unsovlable: The Nanostructure of Gold at 1.1 Å Resolution Print For the first time, a team of scientists led by Roger Kornberg has synthesized thiol-covered gold nanoparticles and, using ALS Beamlines 5.0.2 and 8.2.2 and SSRL Beamlines 11-1 and 11-3, conclusively ascertained their atomic structure (at 1.1 Å resolution). The gold-thiol nanoparticle consists of 102 gold atoms surrounded by 44 molecules of a thiol compound (para-mercaptobenzoic acid, or p-MBA). The central gold atoms are grouped in a fivefold symmetric packing arrangement known as a Marks decahedron, which is surrounded by additional layers of gold atoms in unanticipated geometries. The protective p-MBAs interact not only with the gold but with one another, forming a rigid surface layer. This research is a success on several levels.The group developed a technique that solves a previously unsolvable nanostructure. They delivered a very detailed atomic map of this structure, which itself reveals an unusual discovery: the discrete nature of the nanoparticle, which can be explained by the closing of a 58-electron shell.

231

Investigation of silicon oxide (SiOx) nanowires growth with gold/chromium catalysts  

Science Conference Proceedings (OSTI)

We report the growth of high density silicon Oxide (SiOx) nanowires at an elevated temperature. The nanowires density is enhanced by inserting a thin layer of chromium metal in gold/Si catalyst system. The SiOx nanowires were grown ... Keywords: chromium, gold, nanowires, silicon substrate, thermal annealing

Anima Johari; Vikas Rana

2010-02-01T23:59:59.000Z

232

NANO EXPRESS Open Access Resonant frequency of gold/polycarbonate hybrid  

E-Print Network (OSTI)

NANO EXPRESS Open Access Resonant frequency of gold/polycarbonate hybrid nano resonators fabricated on plastics via nano-transfer printing Edward Dechaumphai1 , Zhao Zhang1 , Nathan P Siwak2,3 , Reza Ghodssi2,3 , Teng Li1,4* Abstract We report the fabrication of gold/polycarbonate (Au/PC) hybrid nano resonators

Li, Teng

233

Hydroxyalkyl phosphine gold complexes for use as diagnostic and therapeutic pharmaceuticals and method of making same  

DOE Patents (OSTI)

A complex and method for making a diagnostic or therapeutic pharmaceutical includes a ligand comprising at least one hydroxyalkyl phosphine donor group bound to a gold atom to form a gold-ligand complex that is stable in aqueous solutions containing oxygen, serum and other body fluids. 20 figs.

Katti, K.V.; Berning, D.E.; Volkert, W.A.; Ketring, A.R.

1998-12-01T23:59:59.000Z

234

Solving the Unsovlable: The Nanostructure of Gold at 1.1 Å Resolution  

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

Solving the Unsovlable: The Solving the Unsovlable: The Nanostructure of Gold at 1.1 Å Resolution Solving the Unsovlable: The Nanostructure of Gold at 1.1 Å Resolution Print Wednesday, 28 May 2008 00:00 For the first time, a team of scientists led by Roger Kornberg has synthesized thiol-covered gold nanoparticles and, using ALS Beamlines 5.0.2 and 8.2.2 and SSRL Beamlines 11-1 and 11-3, conclusively ascertained their atomic structure (at 1.1 Å resolution). The gold-thiol nanoparticle consists of 102 gold atoms surrounded by 44 molecules of a thiol compound (para-mercaptobenzoic acid, or p-MBA). The central gold atoms are grouped in a fivefold symmetric packing arrangement known as a Marks decahedron, which is surrounded by additional layers of gold atoms in unanticipated geometries. The protective p-MBAs interact not only with the gold but with one another, forming a rigid surface layer. This research is a success on several levels.The group developed a technique that solves a previously unsolvable nanostructure. They delivered a very detailed atomic map of this structure, which itself reveals an unusual discovery: the discrete nature of the nanoparticle, which can be explained by the closing of a 58-electron shell.

235

The application of taylor weighting, digital phase shifters, and digital attenuators to phased-array antennas.  

SciTech Connect

Application of Taylor weighting (taper) to an antenna aperture can achieve low peak sidelobes, but combining the Taylor weighting with quantized attenuators and phase shifters at each radiating element will impact the performance of a phased-array antenna. An examination of array performance is undertaken from the simple point of view of the characteristics of the array factor. Design rules and guidelines for determining the Taylor-weighting parameters, the number of bits required for the digital phase shifter, and the dynamic range and number of bits required for the digital attenuator are developed. For a radar application, when each element is fed directly from a transmit/receive module, the total power radiated by the array will be reduced as a result of the taper. Consequently, the issue of whether to apply the taper on both transmit and receive configurations, or only on the receive configuration is examined with respect to two-way sidelobe performance.

Brock, Billy C.

2008-03-01T23:59:59.000Z

236

Theoretical characterization of excitation energy transfer in chlorosome light-harvesting antennae from green sulfur bacteria  

E-Print Network (OSTI)

Chlorosomes are the largest and most efficient natural light-harvesting antenna systems. They contain thousands of pigment molecules - bacteriochlorophylls (BChls)- that are organized into supramolecular aggregates and form a very efficient network for excitonic energy migration. Here, we present a theoretical study of excitation energy transfer (EET) in the chlorosome based on experimental evidence of the molecular assembly. Our model for the exciton dynamics throughout the antenna combines a stochastic time propagation of the excitonic wave function with molecular dynamics simulations of supramolecular structure, and electronic structure calculations of the excited states. The simulation results reveal a detailed picture of the EET in the chlorosome. Coherent energy transfer is significant only for the first 50 fs after the initial excitation, and the wavelike motion of the exciton is completely damped at 100 fs. Characteristic time constants of incoherent energy transfer, subsequently, vary from 1 ps to se...

Fujita, Takatoshi; Saikin, Semion K; Brookes, Jennifer C; Aspuru-Guzik, Alan

2013-01-01T23:59:59.000Z

237

Emittance studies of the SNS external-antenna H- ion source  

Science Conference Proceedings (OSTI)

A new Allison-type emittance scanner has been built to characterize the ion sources and low energy beam transport systems at SNS. In this work, the emittance characteristics of the H- beam produced with the external-antenna RF-driven ion source and transported through the 2-lens electrostatic LEBT are studied. The beam emittance dependence on beam intensity, extraction parameters, and the evolution of the emittance and twiss parameters over beam pulse duration are presented.

Han, Baoxi [ORNL; Stockli, Martin P [ORNL; Welton, Robert F [ORNL; Pennisi, Terry R [ORNL; Murray Jr, S N [ORNL; Santana, Manuel [ORNL; Long, Cary D [ORNL

2010-01-01T23:59:59.000Z

238

Active Geothermal Systems And Associated Gold Deposits In The Great Basin |  

Open Energy Info (EERE)

Geothermal Systems And Associated Gold Deposits In The Great Basin Geothermal Systems And Associated Gold Deposits In The Great Basin Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Active Geothermal Systems And Associated Gold Deposits In The Great Basin Details Activities (0) Areas (0) Regions (0) Abstract: In western North America, a number of geothermal systems derive their heat from magmas or cooling intrusions. The interior of the Great Basin however, is characterized by widespread amagmatic geothermal activity that owes its existence to high crustal heat flow and active extensional tectonics. Both the magmatically heated and extensional fluid types in the Great Basin have recently, or are currently, depositing gold. Quaternary to Pliocene-aged gold deposits with adjacent high-temperature (≤ 150°C)

239

Opportunistic Relaying for Space-Time Coded Cooperation with Multiple Antenna Terminals  

E-Print Network (OSTI)

We consider a wireless relay network with multiple antenna terminals over Rayleigh fading channels, and apply distributed space-time coding (DSTC) in amplify-and-forward (A&F) mode. The A&F scheme is used in a way that each relay transmits a scaled version of the linear combination of the received symbols. It turns out that, combined with power allocation in the relays, A&F DSTC results in an opportunistic relaying scheme, in which only the best relay is selected to retransmit the source's space-time coded signal. Furthermore, assuming the knowledge of source-relay CSI at the source node, we design an efficient power allocation which outperforms uniform power allocation across the source antennas. Next, assuming M-PSK or M-QAM modulations, we analyze the performance of the proposed cooperative diversity transmission schemes in a wireless relay networks with the multiple-antenna source and destination. We derive the probability density function (PDF) of the received SNR at the destination. Then, th...

Maham, Behrouz

2011-01-01T23:59:59.000Z

240

Material and electromagnetic properties of Faraday shields for ion cyclotron heating antennas  

Science Conference Proceedings (OSTI)

The Faraday shields for ion cyclotron antennas must transmit magnetic waves and adsorb little rf power. To investigate these properties, we have constructed 27 Faraday shields in many configurations, including chevrons, tubes, straps, concentric rings, various layered shields, conventionally leafed straps, and replicas of the Faraday shields for ASDEX, the Joint European Torus (JET), TEXTOR, and Alcator-C. We have measured the magnetic flux and observed loading at various operating resistances by using dielectric sheets or magnetic-coupled loads. Each Faraday shield effects a net change in the characteristic inductance of the antenna, resulting in a reduction of wave coupling. However, the load experienced by the antenna is not always reduced because the Faraday shield itself acts as a load. We differentiate between these effects experimentally. The net result of the study is that the Faraday shields now in use cost up to a factor of 50% of coupling. This, of course, reduces the power handling capability by 50% as well. However, configurations exist that are easily cooled and result in a reduction of less than 5% in loading.

Hoffman, D.J.; Becraft, W.R.; Baity, F.W.; Caughman, J.B.O.; Tsai, C.C.

1985-01-01T23:59:59.000Z

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


241

Structure, Function and Reconstitution of Antenna Complexes from Green Photosynthetic Bacteria  

DOE Green Energy (OSTI)

This project is concerned with the structure and function of the chlorosome antennas found in green photosynthetic bacteria. Chlorosomes are ellipsoidal structures attached to the cytoplasmic side of the inner cell membrane. These antenna complexes provide a very large absorption cross section for light capture. Evidence is overwhelming that the chlorosome represents a very different type of antenna from that found in any other photosynthetic system yet studied. It is now clear that chlorosomes do not contain traditional pigment-proteins, in which the pigments bind to specific sites on proteins. Instead, the chlorosome pigments are organized in vivo into pigment oligomers in which direct pigment-pigment interactions are of dominant importance. Our group has used a multidisciplinary approach to investigate this unique system, as well as the complexes that they directly interact with. Our work has included using model systems, numerous types of both steady-state and ultrafast spectroscopy, molecular biology, protein chemistry and X-ray crystallography. Details of our recent results using these approaches are given below and in the references. Numbers cited in the sections refer to DOE-sponsored publications that are listed below. Only publications dated 2001-2004 or later are included in this report. In addition to the primary literature reports, a comprehensive review of this area of research has been written as well as a commentary.

Robert E. Blankenship

2005-08-10T23:59:59.000Z

242

Effect of Gold Marker Seeds on Magnetic Resonance Spectroscopy of the Prostate  

SciTech Connect

Purpose: Magnetic resonance stereoscopic imaging (MRSI) of the prostate is an emerging technique that may enhance targeting and assessment in radiotherapy. Current practices in radiotherapy invariably involve image guidance. Gold seed fiducial markers are often used to perform daily prostate localization. If MRSI is to be used in targeting prostate cancer and therapy assessment, the impact of gold seeds on MRSI must be investigated. The purpose of this study was to quantify the effects of gold seeds on the quality of MRSI data acquired in phantom experiments. Methods and Materials: A cylindrical plastic phantom with a spherical cavity 10 centimeters in diameter wss filled with water solution containing choline, creatine, and citrate. A gold seed fiducial marker was put near the center of the phantom mounted on a plastic stem. Spectra were acquired at 1.5 Tesla by use of a clinical MRSI sequence. The ratios of choline + creatine to citrate (CC/Ci) were compared in the presence and absence of gold seeds. Spectra in the vicinity of the gold seed were analyzed. Results: The maximum coefficient of variation of CC/Ci induced by the gold seed was found to be 10% in phantom experiments at 1.5 T. Conclusion: MRSI can be used in prostate radiotherapy in the presence of gold seed markers. Gold seeds cause small effects (in the order of the standard deviation) on the ratio of the metabolite's CC/Ci in the phantom study done on a 1.5-T scanner. It is expected that gold seed markers will have similar negligible effect on spectra from prostate patients. The maximum of 10% of variation in CC/Ci found in the phantom study also sets a limit on the threshold accuracy of CC/Ci values for deciding whether the tissue characterized by a local spectrum is considered malignant and whether it is a candidate for local boost in radiotherapy dose.

Hossain, Murshed, E-mail: Murshed.Hossain@fccc.edu [Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, PA (United States); Schirmer, Timo [Global MR Applied Science Laboratory, GE Healthcare, Munich (Germany); Richardson, Theresa; Chen, Lili; Buyyounouski, Mark K.; Ma Changming [Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, PA (United States)

2012-05-01T23:59:59.000Z

243

Electronic and Geometric Structures of Small Gold Metal Particles: Particles Size Effects and the Relationship to Catalytic Activity  

SciTech Connect

The structure of supported gold nano-particles is affected by the size of the particles. Smaller metal particles have decreased gold - gold bond lengths, a higher d electron count, and have a more reactive d band. The influence of support is negligible compared to that of particle size.

Bokhoven, Jeroen A. van [Institute for chemical and Bioengineering, ETH Zurich (Switzerland); Miller, Jeffrey T. [BP Research Center, Naperville, IL 60565-8406 (United States)

2007-02-02T23:59:59.000Z

244

Prediction of the thermodynamic properties of gold, arsenic, and  

Office of Scientific and Technical Information (OSTI)

The Hydrothermal Chemistry of Gold, Arsenic, Antimony, Mercury and Silver Brad Bessinger Exponent, Inc. 5335 Meadows Road, Suite 365 Lake Oswego, OR 97035 John A. Apps Earth Sciences Division Lawrence Berkeley National Laboratory University of California, Berkeley, California 94720 March 2005 This work was supported by the Director, Office of Science Office of Basic Energy Sciences of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098. Abstract A comprehensive thermodynamic database based on the Helgeson-Kirkham-Flowers (HKF) equation of state was developed for metal complexes in hydrothermal systems. Because this equation of state has been shown to accurately predict standard partial molal thermodynamic properties of

245

Gold Coated Lanthanide Phosphate Nanoparticles for Targeted Alpha Generator Radiotherapy  

Science Conference Proceedings (OSTI)

Targeted radiotherapies maximize cytotoxicty to cancer cells. In vivo generators such as 225Ac, which emits four particles in its decay chain, can significantly amplify the radiation dose delivered to the target site. However, renal dose from unbound 213Bi escaping during the decay process limits the dose of 225Ac that can be administered. Traditional chelating moieties are unable to sequester the radioactive daughters because of the high recoil energy from alpha particle emission. To counter this, we demonstrate that an engineered multilayered nanoparticle-antibody conjugate can both deliver radiation and contain the decay daughters of the in vivo -generator 225Ac while targeting biologically relevant receptors. These multi-shell nanoparticles combine the radiation resistance of crystalline lanthanide phosphate to encapsulate and contain 225Ac and its radioactive decay daughters, the magnetic properties of gadolinium phosphate for easy separation, and established surface chemistry of gold for attachment of nanoparticles to targeting antibodies.

McLaughlin, Mark F [ORNL; Woodward, Jonathan [ORNL; Boll, Rose Ann [ORNL; Wall, Jonathan [University of Tennessee, Knoxville (UTK); Rondinone, Adam Justin [ORNL; Kennel, Steve J [ORNL; Mirzadeh, Saed [ORNL; Robertson, David J. [University of Missouri

2013-01-01T23:59:59.000Z

246

Ultrafast laser ablation of gold thin film targets  

Science Conference Proceedings (OSTI)

Ultrafast laser ablation of a gold thin film is studied and compared with that of a bulk target, with particular emphasis given to the process of nanoparticles generation. The process is carried out in a condition where a single laser shot removes all the irradiated film spot. The experimental results evidence interesting differences and, in particular, a reduction of the nanoparticles size, and a narrowing of a factor two of their size distribution in the case of ablation of a thin film target, a feature which we relate to a more uniform heating of the target material. We thus show that ultrashort laser ablation of thin films provides a promising way of controlling plume features and nanoparticles size.

Amoruso, S.; Ausanio, G.; Bruzzese, R. [Dipartimento di Scienze Fisiche, Universita degli Studi di Napoli Federico II, Complesso Universitario di Monte S. Angelo, Via Cintia, I-80126 Napoli (Italy); CNR-SPIN, Complesso Universitario di Monte S. Angelo, Via Cintia, I-80126 Napoli (Italy); Nedyalkov, N. N.; Atanasov, P. A. [Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsaridradsko shose Boulevard, Sofia 1784 (Bulgaria); Wang, X. [CNR-SPIN, Complesso Universitario di Monte S. Angelo, Via Cintia, I-80126 Napoli (Italy)

2011-12-15T23:59:59.000Z

247

Gold River, California: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

California: Energy Resources California: Energy Resources (Redirected from Gold River, CA) Jump to: navigation, search Equivalent URI DBpedia Coordinates 38.6262937°, -121.2466156° 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":38.6262937,"lon":-121.2466156,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

248

The Hydrothermal Chemistry of Gold, Arsenic, Antimony, Mercury and Silver  

DOE Green Energy (OSTI)

A comprehensive thermodynamic database based on the Helgeson-Kirkham-Flowers (HKF) equation of state was developed for metal complexes in hydrothermal systems. Because this equation of state has been shown to accurately predict standard partial molal thermodynamic properties of aqueous species at elevated temperatures and pressures, this study provides the necessary foundation for future exploration into transport and depositional processes in polymetallic ore deposits. The HKF equation of state parameters for gold, arsenic, antimony, mercury, and silver sulfide and hydroxide complexes were derived from experimental equilibrium constants using nonlinear regression calculations. In order to ensure that the resulting parameters were internally consistent, those experiments utilizing incompatible thermodynamic data were re-speciated prior to regression. Because new experimental studies were used to revise the HKF parameters for H2S0 and HS-1, those metal complexes for which HKF parameters had been previously derived were also updated. It was found that predicted thermodynamic properties of metal complexes are consistent with linear correlations between standard partial molal thermodynamic properties. This result allowed assessment of several complexes for which experimental data necessary to perform regression calculations was limited. Oxygen fugacity-temperature diagrams were calculated to illustrate how thermodynamic data improves our understanding of depositional processes. Predicted thermodynamic properties were used to investigate metal transport in Carlin-type gold deposits. Assuming a linear relationship between temperature and pressure, metals are predicted to predominantly be transported as sulfide complexes at a total aqueous sulfur concentration of 0.05 m. Also, the presence of arsenic and antimony mineral phases in the deposits are shown to restrict mineralization within a limited range of chemical conditions. Finally, at a lesser aqueous sulfur concentration of 0.01 m, host rock sulfidation can explain the origin of arsenic and antimony minerals within the paragenetic sequence.

Bessinger, Brad; Apps, John A.

2003-03-23T23:59:59.000Z

249

Modeling pore corrosion in normally open gold- plated copper connectors.  

SciTech Connect

The goal of this study is to model the electrical response of gold plated copper electrical contacts exposed to a mixed flowing gas stream consisting of air containing 10 ppb H{sub 2}S at 30 C and a relative humidity of 70%. This environment accelerates the attack normally observed in a light industrial environment (essentially a simplified version of the Battelle Class 2 environment). Corrosion rates were quantified by measuring the corrosion site density, size distribution, and the macroscopic electrical resistance of the aged surface as a function of exposure time. A pore corrosion numerical model was used to predict both the growth of copper sulfide corrosion product which blooms through defects in the gold layer and the resulting electrical contact resistance of the aged surface. Assumptions about the distribution of defects in the noble metal plating and the mechanism for how corrosion blooms affect electrical contact resistance were needed to complete the numerical model. Comparisons are made to the experimentally observed number density of corrosion sites, the size distribution of corrosion product blooms, and the cumulative probability distribution of the electrical contact resistance. Experimentally, the bloom site density increases as a function of time, whereas the bloom size distribution remains relatively independent of time. These two effects are included in the numerical model by adding a corrosion initiation probability proportional to the surface area along with a probability for bloom-growth extinction proportional to the corrosion product bloom volume. The cumulative probability distribution of electrical resistance becomes skewed as exposure time increases. While the electrical contact resistance increases as a function of time for a fraction of the bloom population, the median value remains relatively unchanged. In order to model this behavior, the resistance calculated for large blooms has been weighted more heavily.

Battaile, Corbett Chandler; Moffat, Harry K.; Sun, Amy Cha-Tien; Enos, David George; Serna, Lysle M.; Sorensen, Neil Robert

2008-09-01T23:59:59.000Z

250

Theoretical study of the light scattering from two alternating concentric double silica-gold nanoshell  

SciTech Connect

The cross section of two alternating concentric double silica-gold nanoshell (DSGNS) is obtained as a function of wavelength. Numerical calculations show that two alternating concentric DSGNSs display two separated scattering peaks that the intensity and position of the scattering peaks depend on two gold shells thicknesses and silica layer thickness between them. By varying thicknesses of the layers of the gold shells, two alternating concentric DSGNS can be designed with the scattering peak from the visible to infrared regions of the spectrum.

Khosravi, H. [Department of Physics, Kermanshah Azad University, Kermanshah, 67189-97551 (Iran, Islamic Republic of); Daneshfar, N. [Department of Physics, Razi University, Kermanshah, 67149-67346 (Iran, Islamic Republic of); Bahari, A. [Department of Physics, Lorestan University, Lorestan, 68137-17133 (Iran, Islamic Republic of)

2010-05-15T23:59:59.000Z

251

Nonphotochemical Hole-Burning Studies of Energy Transfer Dynamics in Antenna Complexes of Photosynthetic Bacteria  

Science Conference Proceedings (OSTI)

This thesis contains the candidate's original work on excitonic structure and energy transfer dynamics of two bacterial antenna complexes as studied using spectral hole-burning spectroscopy. The general introduction is divided into two chapters (1 and 2). Chapter 1 provides background material on photosynthesis and bacterial antenna complexes with emphasis on the two bacterial antenna systems related to the thesis research. Chapter 2 reviews the underlying principles and mechanism of persistent nonphotochemical hole-burning (NPHB) spectroscopy. Relevant energy transfer theories are also discussed. Chapters 3 and 4 are papers by the candidate that have been published. Chapter 3 describes the application of NPHB spectroscopy to the Fenna-Matthews-Olson (FMO) complex from the green sulfur bacterium Prosthecochloris aestuarii; emphasis is on determination of the low energy vibrational structure that is important for understanding the energy transfer process associated within three lowest energy Q{sub y}-states of the complex. The results are compared with those obtained earlier on the FMO complex from Chlorobium tepidum. In Chapter 4, the energy transfer dynamics of the B800 molecules of intact LH2 and B800-deficient LH2 complexes of the purple bacterium Rhodopseudomonas acidophila are compared. New insights on the additional decay channel of the B800 ring of bacteriochlorophyll{sub a} (BChl{sub a}) molecules are provided. General conclusions are given in Chapter 5. A version of the hole spectrum simulation program written by the candidate for the FMO complex study (Chapter 3) is included as an appendix. The references for each chapter are given at the end of each chapter.

Satoshi Matsuzaki

2002-06-27T23:59:59.000Z

252

Theory and Manufacturing Processes of Solar NanoAntenna Electromagnetic Collectors  

DOE Green Energy (OSTI)

DRAFT For Submittal to Journal of Solar Energy - Rev 10.1 ---SOL-08-1091 SOLAR Nantenna Electromagnetic Collectors Dale K. Kotter Idaho National Laboratory Steven D. Novack Idaho National Laboratory W. Dennis Slafer MicroContinuum, Inc. Patrick Pinhero University of Missouri ABSTRACT The research described in this paper explores a new and efficient approach for producing electricity from the abundant energy of the sun, using nanoantenna (nantenna) electromagnetic collectors (NECs). NEC devices target mid-infrared wavelengths, where conventional photovoltaic (PV) solar cells are inefficient and where there is an abundance of solar energy. The initial concept of designing NECs was based on scaling of radio frequency antenna theory to the infrared and visible regions. This approach initially proved unsuccessful because the optical behavior of materials in the terahertz (THz) region was overlooked and, in addition, economical nanofabrication methods were not previously available to produce the optical antenna elements. This paper demonstrates progress in addressing significant technological barriers, including: 1) development of frequency-dependent modeling of double-feedpoint square spiral nantenna elements; 2) selection of materials with proper THz properties; and 3) development of novel manufacturing methods that could potentially enable economical large-scale manufacturing. We have shown that nantennas can collect infrared energy and induce THz currents, and we have also developed cost-effective proof-of-concept fabrication techniques for the large-scale manufacture of simple square loop nantenna arrays. Future work is planned to embed rectifiers into the double-feedpoint antenna structures. This work represents an important first step toward the ultimate realization of a low-cost device that will collect as well as convert this radiation into electricity. This could lead to a broadband, high conversion efficiency low-cost solution to complement conventional PV devices.

Dale K. Kotter; Steven D. Novack

2010-02-01T23:59:59.000Z

253

Absolute beam flux measurement at NDCX-I using gold-melting calorimetry technique  

E-Print Network (OSTI)

1]. Here c - specific heat capacity, m - mass of heatedis determined by the Au heat capacity. During stage (2) thefor gold density and heat capacity it can be estimated that

Ni, P.A.

2011-01-01T23:59:59.000Z

254

Synthesis and bioconjugation of gold nanoparticles as potential molecular probes for light-based imaging techniques  

Science Conference Proceedings (OSTI)

We have synthesized and characterized gold nanoparticles (spheres and rods) with optical extinction bands within the "optical imaging window." The intense plasmon resonant driven absorption and scattering peaks of these nanoparticles make them suitable ...

Raja Gopal Rayavarapu; Wilma Petersen; Constantin Ungureanu; Janine N. Post; Ton G. van Leeuwen; Srirang Manohar

2007-01-01T23:59:59.000Z

255

Gold nanoparticle sensor for the visual detection of pork adulteration in meatball formulation  

Science Conference Proceedings (OSTI)

We visually identify pork adulteration in beef and chicken meatball preparations using 20nm gold nanoparticles (GNPs) as colorimetric sensors. Meatball is a popular food in certain Asian and European countries. Verification of pork adulteration in meatball ...

M. E. Ali; U. Hashim; S. Mustafa; Y. B. Che Man; Kh. N. Islam

2012-01-01T23:59:59.000Z

256

Effects of varying ethanol and water concentrations as a gold nanoparticle gel solvent  

E-Print Network (OSTI)

Striped gold nanoparticles are unique in several of their characteristics and applications. Recent experiments have determined a new medium with which contain the nanoparticles is that of a chemical gel. The nanoparticles ...

Schaefer, Thomas Gerard

2009-01-01T23:59:59.000Z

257

In Situ XAS Studies on the Structure of the Active Site of Supported Gold Catalysts  

Science Conference Proceedings (OSTI)

Gold clusters supported on Al2O3 and TiO2 have been exposed to different mixtures of CO and O2. Their structure has been probed in situ using X-ray absorption spectroscopy (XAS) at the Au L3-edge. In all materials, the dominant phase during catalysis is Au0. Both samples show variations of the electronic structure of the gold clusters with changing reaction conditions as evidenced by changes in the X-ray absorption near-edge (XANES) region. These variations are caused by interaction between the gold clusters and the carbon monoxide present in the gas phase. The gold atoms remain zerovalent throughout all experiments confirming the importance of Au0 for catalytic activity.

Weiher, Norbert; Beesley, Angela M.; Tsapatsaris, Nikolaos [Molecular Materials Centre, School of Chemical Engineering and Analytical Science, Sackville Street, PO Box 88, Manchester, M60 1QD (United Kingdom); Louis, Catherine; Delannoy, Laurent [Laboratoire de Reactivite de Surface, UMR 7609 CNRS, Universite Pierre et Marie Curie, 4 place Jussieu, 75252, Paris, Cedex 05 (France); Bokhoven, Jeroen A. van [Institute for Chemical and Bioengineering, ETH Zurich, 8093 Zurich (Switzerland); Schroeder, Sven L. M. [Molecular Materials Centre, School of Chemical Engineering and Analytical Science, Sackville Street, PO Box 88, Manchester, M60 1QD (United Kingdom); Molecular Materials Centre, School of Chemistry, Sackville Street, PO Box 88, Manchester, M60 1QD (United Kingdom)

2007-02-02T23:59:59.000Z

258

Noble Metal Catalysts for Mercury Oxidation in Utility Flue Gas: Gold, Palladium and Platinum Formulations  

Science Conference Proceedings (OSTI)

The use of noble metals as catalysts for mercury oxidation in flue gas remains an area of active study. To date, field studies have focused on gold and palladium catalysts installed at pilot scale. In this article, we introduce bench-scale experimental results for gold, palladium and platinum catalysts tested in realistic simulated flue gas. Our initial results reveal some intriguing characteristics of catalytic mercury oxidation and provide insight for future research into this potentially important process.

Presto, A.A.; Granite, E.J

2008-07-01T23:59:59.000Z

259

Enhanced relative biological effectiveness of proton radiotherapy in tumor cells with internalized gold nanoparticles  

Science Conference Proceedings (OSTI)

The development and use of sensitizing agents to improve the effectiveness of radiotherapy have long been sought to improve our ability to treat cancer. In this letter, we have studied the relative biological effectiveness of proton beam radiotherapy on prostate tumor cells with and without internalized gold nanoparticles. The effectiveness of proton radiotherapy for the killing of prostate tumor cells was increased by approximately 15%-20% for those cells containing internalized gold nanoparticles.

Polf, Jerimy C.; Gillin, Michael [Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States); Bronk, Lawrence F. [Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States); David H. Koch Center, University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States); Driessen, Wouter H. P.; Arap, Wadih; Pasqualini, Renata [David H. Koch Center, University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States)

2011-05-09T23:59:59.000Z

260

Compact circularly polarized slot-ring antenna and microstrip bandpass filter using triangular open-loop resonators  

E-Print Network (OSTI)

In this thesis two different research topics are undertaken, both in the area of compact RF/microwave circuits design. The first topic involves the design of a compact circularly polarized (CP) slot-ring antenna. A study of several compact CP microstrip and slotline antennas reported in the past has been carried out. In this research, a method of reducing the size of a printed slot-ring antenna is proposed. The reduction in size is achieved by introducing meandered-slot sections in the ring. Circular polarization is achieved by introducing an asymmetry, also a meandered-slot section, and feeding the antenna at an angle of 45o from the asymmetry using a microstrip feed line. The minimum axial ratio of 0.4 dB is obtained at 2.46 GHz, which is the operating frequency of the antenna. The size of the proposed antenna is reduced by about 50% compared to a conventional CP slot-ring antenna and it displays a CP bandwidth of about 2.5%. The simulated and measured results are presented, and they are in good agreement. The small size of the antenna makes it very suitable for use in modern RF/microwave wireless systems which require compact, low cost, and high performance circuits. Moreover, its CP behavior makes it more attractive for applications such as satellite communications. The second topic in the thesis involves the design of a compact microstrip bandpass filter using triangular open-loop resonators. A new compact three-pole microstrip bandpass filter using four triangular open-loop resonators is presented. A fourth resonator is placed to provide cross-coupling in the structure which gives a better skirt rejection. The measured pass-band center frequency is 2.85 GHz. The filter demonstrates about 7% bandwidth with insertion loss of less than 1 dB in the passband, a return loss of greater than 15 dB and out-of-band rejection of greater than 30 dB. The simulated and measured results are in good agreement. The proposed filter is very attractive for use in modern wireless systems which require bandpass filters having compact size, low insertion loss, high selectivity, and good out-of-band rejection.

Farooqui, Muhammad Fahad

2006-12-01T23:59:59.000Z

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261

Gold-Copper Nanoparticles: Nanostructural Evolution and Bifunctional Catalytic Sites  

Science Conference Proceedings (OSTI)

Understanding of the atomic-scale structure is essential for exploiting the unique catalytic properties of any nanoalloy catalyst. This report describes novel findings of an investigation of the nanoscale alloying of gold-copper (AuCu) nanoparticles and its impact on the surface catalytic functions. Two pathways have been explored for the formation of AuCu nanoparticles of different compositons, including wet chemical synthesis from mixed Au- and Cu-precursor molecules, and nanoscale alloying via an evolution of mixed Au- and Cu-precursor nanoparticles near the nanoscale melting temperatures. For the evolution of mixed precursor nanoparticles, synchrotron x-ray based in-situ real time XRD was used to monitor the structural changes, revealing nanoscale alloying and reshaping towards an fcc-type nanoalloy (particle or cube) via a partial meltingresolidification mechanism. The nanoalloys supported on carbon or silica were characterized by in-situ high-energy XRD/PDFs, revealing an intriguing lattice "expanding-shrinking" phenomenon depending on whether the catalyst is thermochemically processed under oxidative or reductive atmosphere. This type of controllable structural changes is found to play an important role in determining the catalytic activity of the catalysts for carbon monoxide oxidation reaction. The tunable catalytic activities of the nanoalloys under thermochemically oxidative and reductive atmospheres are also discussed in terms of the bifunctional sites and the surface oxygenated metal species for carbon monoxide and oxygen activation.

Yin, Jun; Shan, Shiyao; Yang, Lefu; Mott, Derrick; Malis, Oana; Petkov, Valeri; Cai, Fan; Ng, Mei; Luo, Jin; Chen, Bing H.; Engelhard, Mark H.; Zhong, Chuan-Jian

2012-12-12T23:59:59.000Z

262

Combining Training and Quantized Feedback in Multi-Antenna Reciprocal Channels  

E-Print Network (OSTI)

The communication between a multiple-antenna transmitter and multiple receivers (users) with either a single or multiple-antenna each can be significantly enhanced by providing the channel state information at the transmitter (CSIT) of the users, as this allows for scheduling, beamforming and multiuser multiplexing gains. The traditional view on how to enable CSIT has been as follows so far: In time-division duplexed (TDD) systems, uplink (UL) and downlink (DL) channel reciprocity allows the use of a training sequence in the UL direction, which is exploited to obtain an UL channel estimate. This estimate is in turn recycled in the next downlink slot. In frequency-division duplexed (FDD) systems, which lack the UL and DL reciprocity, the CSIT is provided via the use of a dedicated feedback link of limited capacity between the receivers and the transmitter. In this paper, we focus on TDD systems and put this classical approach in question. In particular, we show that the traditional TDD setup above fails to ful...

Salim, Umer; Slock, Dirk

2009-01-01T23:59:59.000Z

263

Improved Connectivity using Hybrid Uni/Omni-Directional Antennas in Sensor Networks  

E-Print Network (OSTI)

Connectivity in sensor networks is an important metric that describes the capability of networks to be able to report sensed information. The ability of member nodes to communicate with each other and collectively report data largely depends on connectivity. Density of node deployment, the transmission radius of the antenna and the communication paradigm employed has a significant effect on connectivity. A network deployment is said to be connected when every node within the network is capable of communicating, either via multi-hops or direct links to every other node in the network. This is a very strict connectivity requirement called 100% connectivity. This work deals with analyzing connectivity in various randomly deployed sensor network deployments and comparing metrics between omni and hybrid uni/omni-directional sensor networks. Specific results will be presented with varying node deployment densities and transmission radii and the levels of connectivity they guarantee. These results have significant impact on secure routing protocol design for wireless sensor networks and planning network deployments. I also present results on k-connectivity, which is a metric that represents network availability, along with the dependence on transmission radii, node densities and uni-directional antenna beam width.

Kwon, Ji Heon

2008-05-27T23:59:59.000Z

264

Robotic localization of hostile networked radio sources with a directional antenna  

E-Print Network (OSTI)

One of the distinguishing characteristics of hostile networked radio sources (e.g., enemy sensor network nodes), is that only physical layer information and limited medium access control (MAC) layer information of the network is observable. We propose a scheme to localize hostile networked radio sources based on the radio signal strength and communication protocol pattern analysis using a mobile robot with a directional antenna. We integrate a Particle Filter algorithm with a new sensing model which is built on a directional antenna model and Carrier Sense Multiple Access (CSMA)-based MAC protocol model. we model and analyze the channel idle probability and busy collision probability as a function of the number of radio sources in the CSMA protocol modeling. Based on the sensing model, we propose a particle-filter-based scheme to simultaneously estimate the number and the positions of networked radio sources. We provide a localization scheme based on the method of steepest descent for the purpose of performance comparison. Simulation results demonstrate that our proposed localization scheme has a better success rate than the scheme based on the steepest descent at different tolerant distances.

Hu, Qiang

2005-12-01T23:59:59.000Z

265

Theoretical characterization of excitation energy transfer in chlorosome light-harvesting antennae from green sulfur bacteria  

E-Print Network (OSTI)

Chlorosomes are the largest and most efficient natural light-harvesting antenna systems. They contain thousands of pigment molecules - bacteriochlorophylls (BChls)- that are organized into supramolecular aggregates and form a very efficient network for excitonic energy migration. Here, we present a theoretical study of excitation energy transfer (EET) in the chlorosome based on experimental evidence of the molecular assembly. Our model for the exciton dynamics throughout the antenna combines a stochastic time propagation of the excitonic wave function with molecular dynamics simulations of supramolecular structure, and electronic structure calculations of the excited states. The simulation results reveal a detailed picture of the EET in the chlorosome. Coherent energy transfer is significant only for the first 50 fs after the initial excitation, and the wavelike motion of the exciton is completely damped at 100 fs. Characteristic time constants of incoherent energy transfer, subsequently, vary from 1 ps to several tens of ps. We assign the time scales of the EET to specific physical processes by comparing our results with the data obtained from time-resolved spectroscopy experiments.

Takatoshi Fujita; Joonsuk Huh; Semion K. Saikin; Jennifer C. Brookes; Alan Aspuru-Guzik

2013-04-17T23:59:59.000Z

266

PS2007 Satellite Meeting on Photosynthetic Antennas, 19-22 July 2007, Drymen, Scotland  

SciTech Connect

A Satellite Workshop of the 14th International Congress on Photosynthesis on the topic of photosynthetic light-harvesting systems was held on 18-21 July 2007, at the Buchanan Arms Hotel in Drymen, Scotland, near Glasgow. This meeting continued the tradition of satellite light-harvesting conferences occurring prior to the last five international photosynthesis congresses in Japan, France, Hungary, Australia and Canada, dating from 1992. With an attendance of 124 participants, this Workshop represents an intimate gathering of scientists interested in a thorough coverage of the light-harvesting aspects of photosynthesis. A significant amount of time was set aside for discussion and poster sessions. The organizers were: Richard J. Cogdell, UK (Chairperson), Alastair T. Gardiner, UK, Conrad W. Mullineaux, UK, Robert A. Niederman, USA, Robert E. Blankenship, USA, Harry Frank, USA, Bruno Robert, France. Sessions were focused on new concepts relating to the function, regulation, assembly, photoprotection and evolution of a wide variety of antenna systems. Cutting-edge scientific methods used to study these systems that were covered included time-resolved and single-molecule spectroscopy, structure determination by X-ray diffraction, NMR and electron and atomic force microscopy, molecular genetics, protein chemistry, model systems and theory. A central theme was how emerging high-resolution structural information on antenna proteins continues to provide an enhanced understanding of areas ranging from the kinetics of energy transfer processes to the assembly of the photosynthetic apparatus.

Robert E. Blankenship

2009-06-04T23:59:59.000Z

267

Antenna Metrology  

Science Conference Proceedings (OSTI)

... and of satellites and spacecraft vital for communications, weather prediction, and ... and related power sources, such as batteries and solar panels. ...

2011-02-11T23:59:59.000Z

268

Experimental observation of left polarized wave absorption near electron cyclotron resonance frequency in helicon antenna produced plasma  

SciTech Connect

Asymmetry in density peaks on either side of an m = +1 half helical antenna is observed both in terms of peak position and its magnitude with respect to magnetic field variation in a linear helicon plasma device [Barada et al., Rev. Sci. Instrum. 83, 063501 (2012)]. The plasma is produced by powering the m = +1 half helical antenna with a 2.5 kW, 13.56 MHz radio frequency source. During low magnetic field (B < 100 G) operation, plasma density peaks are observed at critical magnetic fields on either side of the antenna. However, the density peaks occurred at different critical magnetic fields on both sides of antenna. Depending upon the direction of the magnetic field, in the m = +1 propagation side, the main density peak has been observed around 30 G of magnetic field. On this side, the density peak around 5 G corresponding to electron cyclotron resonance (ECR) is not very pronounced, whereas in the m = -1 propagation side, very pronounced ECR peak has been observed around 5 G. Another prominent density peak around 12 G has also been observed in m = -1 side. However, no peak has been observed around 30 G on this m = -1 side. This asymmetry in the results on both sides is explained on the basis of polarization reversal of left hand polarized waves to right hand polarized waves and vice versa in a bounded plasma system. The density peaking phenomena are likely to be caused by obliquely propagating helicon waves at the resonance cone boundary.

Barada, Kshitish K.; Chattopadhyay, P. K.; Ghosh, J.; Kumar, Sunil; Saxena, Y. C. [Institute for Plasma Research, Bhat, Gandhinagar 382428 (India)

2013-01-15T23:59:59.000Z

269

Antenna vector impedance measurement by the EXOS-D (AKEBONO) very low frequency plasma waves instrument (VLF)  

SciTech Connect

Antenna impedance has been measured on board the EXOS-D (Akebono) satellite by imposing a constant current at VLF. The impedance is obtained in a complex form, i.e., as a resistance and a capacitance. This is essential to obtain the absolute electric field intensities of the VLF waves. A critical frequency below which the resistive part becomes important is also obtained.

Hashimoto, Kozo (Tokyo Denki Univ. (Japan)); Nagano, Isamu (Kanazawa Univ. (Japan)); Okada, Toshimi (Toyama Prefectural Univ. (Japan)); Yamamoto, Masayuki; Kimura, Iwane (Kyoto Univ. (Japan))

1991-02-01T23:59:59.000Z

270

Physics and engineering results obtained with the ion cyclotron range of frequencies ITER-like antenna on JET  

SciTech Connect

This paper summarizes the operational experience of the ion cyclotron resonant frequency (ICRF) ITER-like antenna on JET aiming at substantially increasing the power density in the range of the requirements for ITER combined with load resiliency. An in-depth description of its commissioning, operational aspects and achieved performances is presented.

Durodie, F. [ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium; Nightingale, M. [EURATOM / UKAEA, Abingdon, UK; Mayoral, M. -L. [EURATOM / UKAEA, Abingdon, UK; Ongena, J. [ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium; Argouarch, A. [CEA Cadarache, St. Paul lex Durance, France; Berger-By, G. [CEA Cadarache, St. Paul lex Durance, France; Goulding, Richard Howell [ORNL

2012-01-01T23:59:59.000Z

271

The Genomes On Line Database (GOLD) in 2009: status of genomic and metagenomic projects and their associated metadata  

SciTech Connect

The Genomes On Line Database (GOLD) is a comprehensive resource for centralized monitoring of genome and metagenome projects worldwide. Both complete and ongoing projects, along with their associated metadata, can be accessed in GOLD through precomputed tables and a search page. As of September 2009, GOLD contains information for more than 5800 sequencing projects, of which 1100 have been completed and their sequence data deposited in a public repository. GOLD continues to expand, moving toward the goal of providing the most comprehensive repository of metadata information related to the projects and their organisms/environments in accordance with the Minimum Information about a (Meta)Genome Sequence (MIGS/MIMS) specification.

Liolios, Konstantinos; Chen, Amy; Mavromatis, Konstantinos; Tavernarakis, Nektarios; Hugenholtz, Phil; Markowitz, Victor; Kyrpides, Nikos C.

2009-09-01T23:59:59.000Z

272

Microwave and millimeter-wave rectifying circuit arrays and ultra-wideband antennas for wireless power transmission and communications  

E-Print Network (OSTI)

In the future, space solar power transmission and wireless power transmission will play an important role in gathering clean and infinite energy from space. The rectenna, i.e., a rectifying circuit combined with an antenna, is one of the most important components in the wireless power transmission system. To obtain high power and high output voltage, the use of a large rectenna array is necessary. Many novel rectennas and rectenna arrays for microwave and millimeter-wave wireless power transmission have been developed. Unlike the traditional rectifying circuit using a single diode, dual diodes are used to double the DC output voltage with the same circuit layout dimensions. The rectenna components are then combined to form rectenna arrays using different interconnections. The rectennas and the arrays are analyzed by using a linear circuit model. Furthermore, to precisely align the mainbeams of the transmitter and the receiver, a retrodirective array is developed to maintain high efficiency. The retrodirective array is able to track the incident wave and resend the signal to where it came from without any prior known information of the source location. The ultra-wideband radio has become one of the most important communication systems because of demand for high data-rate transmission. Hence, ultra-wideband antennas have received much attention in mobile wireless communications. Planar monopole ultra-wideband antennas for UHF, microwave, and millimeter-wave bands are developed, with many advantages such as simple structure, low cost, light weight, and ease of fabrication. Due to the planar structures, the ultra-wideband antennas can be easily integrated with other circuits. On the other hand, with an ultra-wide bandwidth, source power can be transmitted at different frequencies dependent on power availability. Furthermore, the ultra-wideband antenna can potentially handle wireless power transmission and data communications simultaneously. The technologies developed can also be applied to dual-frequency or the multi-frequency antennas. In this dissertation, many new rectenna arrays, retrodirective rectenna arrays, and ultra-wideband antennas are presented for microwave and millimeter-wave applications. The technologies are not only very useful for wireless power transmission and communication systems, but also they could have many applications in future radar, surveillance, and remote sensing systems.

Ren, Yu-Jiun

2007-05-01T23:59:59.000Z

273

ANTENNA RADIATION NEAR THE LOCAL PLASMA FREQUENCY BY LANGMUIR WAVE EIGENMODES  

Science Conference Proceedings (OSTI)

Langmuir waves (LWs) in the solar wind are generated by electron beams associated with solar flares, interplanetary shock fronts, planetary bow shocks, and magnetic holes. In principle, LWs localized as eigenmodes of density fluctuations can emit electromagnetic (EM) radiation by an antenna mechanism near the local plasma frequency f{sub p} and twice the local plasma frequency. In this work, analytic expressions are derived for the radiated electric and magnetic fields and power generated near f{sub p} by LW eigenmodes. The EM wave power emitted near f{sub p} is predicted as a function of the eigenmode length scale L, maximum electric field, driving electron beam speed, and the ambient plasma density and temperature. The escape to a distant observer of f{sub p} radiation from a localized Langmuir eigenmode is also briefly explored as a function of the plasma conditions.

Malaspina, David M. [Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303 (United States); Cairns, Iver H. [School of Physics, University of Sydney, New South Wales 2006 (Australia); Ergun, Robert E., E-mail: David.Malaspina@lasp.colorado.edu, E-mail: cairns@physics.usyd.edu.au, E-mail: ree@lasp.colorado.edu [Laboratory for Atmospheric and Space Physics, Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80303 (United States)

2012-08-10T23:59:59.000Z

274

Transmit Signal and Bandwidth Optimization in Multiple-Antenna Relay Channels  

E-Print Network (OSTI)

Transmit signal and bandwidth optimization is considered in multiple-antenna relay channels. Assuming all terminals have channel state information, the cut-set capacity upper bound and decode-and-forward rate under full-duplex relaying are evaluated by formulating them as convex optimization problems. For half-duplex relays, bandwidth allocation and transmit signals are optimized jointly. Moreover, achievable rates based on the compress-and-forward transmission strategy are presented using rate-distortion and Wyner-Ziv compression schemes. It is observed that when the relay is close to the source, decode-and-forward is almost optimal, whereas compress-and-forward achieves good performance when the relay is close to the destination.

Ng, Chris T K

2010-01-01T23:59:59.000Z

275

Antenna Beam Steering For Wireless Sensors Using Real Time Phase Shifter  

E-Print Network (OSTI)

As part of the increasing demand for accurate, secure and robust short range wireless sensors for Smart Grid systems, we present the design and the simulation of phased array transmitter with variable delay based phase shifters. Multiple antennas are used to achieve beam steering using active beamforming technique. Our design exploits the multiple signal paths. In addition, the transmitter will provide feasible directional point-to-point communication networks via transmitting the signal to the preferred receiver with the desired coverage. The sensitivity and the accuracy of the system are enhanced in terms of object identification and location, respectively. This wireless sensor appears well suited for use in Smart Grid technologies operating at 2.4GHz ISM band with 250kbps data rate capacity where minimum cost and high integration are valued.

Saha, S.; Unnikrishna, U.; Khanna, P.; Al-Attar, T.

2010-01-01T23:59:59.000Z

276

30-60 MHz FWCD system on DIII-D: Power division, phase control and tuning for a four-element antenna array  

SciTech Connect

The 2 MW Fast Wave Current Drive system on DIII-D is intended to provide a near-term demonstration of up to 0.3 MA of current driven by the fast wave. The system used to drive the four element phased antenna array which produces the required directional spectrum is presented. This system must be able to cope with strong coupling between antenna elements and the time-varying plasma load seen by the antennas. Computer modelling shows that this system should be able to maintain a directional spectrum at full power under most anticipated load conditions. 5 refs., 1 fig.

Pinsker, R.I.; Mayberry, M.J.; Petty, C.C.; Cary, W.P.; Pusl, J.; Remsen, D. (General Atomics, San Diego, CA (United States)); Baity, F.W.; Goulding, R.H.; Hofmann, D.J. (Oak Ridge National Lab., TN (United States))

1991-11-01T23:59:59.000Z

277

Observation of EHO in NSTX and Theoretical Study of its Active Control Using HHFW Antenna  

SciTech Connect

Two important topics in the tokamak ELM control, using the non-axisymmetric (3D) magnetic perturbations, are studied in NSTX and combined envisioning ELM control in the future NSTX-U operation: Experimental observations of the edge harmonic oscillation in NSTX (not necessarily the same as EHOs in DIII-D), and theoretical study of its external drive using the high harmonic fast wave (HHFW) antenna as a 3D field coil. Edge harmonic oscillations were observed particularly well in NSTX ELM-free operation with low n core modes, with various diagnostics confirming n = 4 ~#24; 6 edge-localized and coherent oscillations in 2 ~#24; 8kHz frequency range. These oscillations seem to have a favored operational window in rotational shear, similarly to EHOs in DIII-D QH modes . However, in NSTX, they are not observed to provide particle or impurity control, possibly due to their weak amplitudes, of a few mm displacements, as measured by reflectometry. The external drive of these modes has been proposed in NSTX, by utilizing audio-frequency currents in the HHFW antenna straps. Analysis shows that the HHFW straps can be optimized to maximize n = 4 ~#24; 6 while minimizing n = 1 ~#24; 3. Also, IPEC calculations show that the optimized configuration with only 1kAt current can produce comparable or larger displacements than the observed internal modes. If this optimized external drive can be constructively combined, or further resonated with the internal modes, the edge harmonic oscillations in NSTX may be able to produce sufficient particle control to modify ELMs.

J.-K. Park, et. al.

2013-01-14T23:59:59.000Z

278

A New Gold Pan For The West- Discovering Blind Geothermal Systems With  

Open Energy Info (EERE)

Gold Pan For The West- Discovering Blind Geothermal Systems With Gold Pan For The West- Discovering Blind Geothermal Systems With Shallow Temperature Surveys Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: A New Gold Pan For The West- Discovering Blind Geothermal Systems With Shallow Temperature Surveys Details Activities (6) Areas (4) Regions (0) Abstract: The use of rapidly deployable 2-meter-deep shallow temperature surveys has led to the discovery of at least two blind geothermal systems in Nevada, USA and has helped to define the spatial extent of thermal anomalies at two other locations. At Teels Marsh, two shallow temperature anomalies with a combined strike length of almost 4 km were identified adjacent to a Quaternary fault on the west side of the playa. At Rhodes Marsh, a thermal anomaly at least 5 km long was located adjacent to

279

Bulk Gold-Catalyzed Reactions of Isocyanides, Amines, and Amine N-Oxides  

Science Conference Proceedings (OSTI)

Bulk gold powder (550 ?m particles) catalyzes the reactions of isocyanides with amines and amine N-oxides to produce ureas. The reaction of n-butyl isocyanide (nBuN?C) with di-n-propylamine and N-methylmorpholine N-oxide in acetonitrile, which was studied in the greatest detail, produced 3-butyl-1,1-dipropylurea (O?C(NHnBu)(NnPr2)) in 99% yield at 60 C within 2 h. Sterically and electronically different isocyanides, amines, and amine N-oxides react successfully under these conditions. Detailed studies support a two-step mechanism that involves a gold-catalyzed reaction of adsorbed isocyanide with the amine N-oxide to form an isocyanate (RN?C?O), which rapidly reacts with the amine to give the urea product. These investigations show that bulk gold, despite its reputation for poor catalytic activity, is capable of catalyzing these reactions.

Klobukowski, Erik; Angelici, Robert; Woo, Keith L.

2012-01-26T23:59:59.000Z

280

A laser-induced repetitive fast neutron source applied for gold activation analysis  

SciTech Connect

A laser-induced repetitively operated fast neutron source was developed for applications in laser-driven nuclear physics research. The developed neutron source, which has a neutron yield of approximately 4 Multiplication-Sign 10{sup 5} n/pulse and can be operated up to a pulse repetition rate of 10 Hz, was applied for a gold activation analysis. Relatively strong delayed gamma spectra of the activated gold were measured at 333 keV and 355 keV, and proved the possibility of the neutron source for activation analyses. In addition, the nuclear reactions responsible for the measured gamma spectra of gold were elucidated by the 14 MeV fast neutrons resulting from the D(t,n)He{sup 4} nuclear reaction, for which the required tritium originated from the primary fusion reaction, D(d,p)T{sup 3}.

Lee, Sungman; Park, Sangsoon; Lee, Kitae; Cha, Hyungki [Quantum Optics Division, Korea Atomic Energy Research Institute, Daejeon 305-600 (Korea, Republic of)

2012-12-15T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Charge Retention by Gold Clusters on Surfaces Prepared Using Soft Landing of Mass Selected Ions  

Science Conference Proceedings (OSTI)

Monodisperse gold clusters have been prepared on surfaces in different charge states through soft landing of mass-selected ions. Ligand-stabilized gold clusters were prepared in methanol solution by reduction of chloro(triphenylphosphine)gold(I) with borane tert-butylamine complex in the presence of 1,3-bis(diphenylphosphino)propane. Electrospray ionization was used to introduce the clusters into the gas-phase and mass-selection was employed to isolate a single ionic cluster species (Au11L53+, L = 1,3-bis(diphenylphosphino)propane) which was delivered to surfaces at well controlled kinetic energies. Using in-situ time of flight secondary ion mass spectrometry (TOF-SIMS) it is demonstrated that the Au11L53+ cluster retains its 3+ charge state when soft landed onto the surface of a 1H,1H,2H,2H-

Johnson, Grant E.; Priest, Thomas A.; Laskin, Julia

2012-01-24T23:59:59.000Z

282

Mechanical fatigue analysis of gold microbeams for RF-MEMS applications by pull-in voltage monitoring  

Science Conference Proceedings (OSTI)

This work is focused on the reliability of gold microcantilevers under the effect of mechanical fatigue. A dedicated device for testing the material is designed and built; the material degradation is monitored during the tests by means of a novel technique ... Keywords: Failure analysis, Fatigue, Gold, MEMS, Reliability

G. Pasquale; A. Som; A. Ballestra

2009-12-01T23:59:59.000Z

283

ITP Mining: Energy and Environmental Profile of the U.S. Mining Industry: Chapter 7: Gold & Silver  

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

Department of Energy Department of Energy 7 Gold & Silver Gold has played a prominent role in world economic and political events. Most of the gold mined over the past 6000 years exists mainly in the form of refined gold held by governments as monetary reserve assets or by individuals in the form of jewelry, bullion coins, or small bars held as insurance against currency devaluation. In modern usage, gold is also used worldwide in numerous electronic, industrial, and dental applications, but more than three-fourths of the world's total annual demand goes toward the fabrication of jewelry and the minting of coins. Silver has three primary applications: industrial and decorative uses, photography, and jewelry and silverware. Together, these categories represent more than 95 percent of

284

Modeling, Error Analysis, and Evaluation of Dual-Polarization Variables Obtained from Simultaneous Horizontal and Vertical Polarization Transmit Radar. Part I: Modeling and Antenna Errors  

Science Conference Proceedings (OSTI)

In this two-part paper the biases of polarimetric variables from simultaneous horizontally and vertically transmitted (SHV) data are investigated. Here, in Part I, a radar-scattering model is developed and antenna polarization errors are ...

J. C. Hubbert; S. M. Ellis; M. Dixon; G. Meymaris

2010-10-01T23:59:59.000Z

285

Skill Assessment of Resolving Ocean Surface Current Structure Using Compact-Antenna-Style HF Radar and the MUSIC Direction-Finding Algorithm  

Science Conference Proceedings (OSTI)

A skill analysis of the Multiple Signal Characterization (MUSIC) algorithm used in compact-antenna-style HF radar ocean current radial velocity/bearing determination is performed using simulation. The simulation is based upon three collocated ...

Tony de Paolo; Eric Terrill

2007-07-01T23:59:59.000Z

286

Modeling movements in oil, gold, forex and market indices using search volume index and Twitter sentiments  

Science Conference Proceedings (OSTI)

Study of the forecasting models using large scale microblog discussions and the search behavior data can provide a good insight for better understanding the market movements. In this work we collected a dataset of 2 million tweets and search volume index ... Keywords: Twitter, data mining, forex, gold, microblogging, oil, sentiment analysis, social network analysis, stock market

Tushar Rao, Saket Srivastava

2013-05-01T23:59:59.000Z

287

Sensitive Detection of H2S Using Gold Nanoparticle Decorated Single-Walled Carbon  

E-Print Network (OSTI)

in large amounts in coal and natural gas processing, petroleum industries, biogas production, and sewage . The H2S and dry air gas flow rates were regulated by mass flow controllers (Alicat Scientific Incorpo sensitive conducto- metric gas nanosensors for H2S can be synthesized by electrodepositing gold

288

Microstructural characteristics of pure gold processed by equal-channel angular pressing  

E-Print Network (OSTI)

Materials Engineering, Osaka City University, Osaka 558-8585, Japan c Departments of Aerospace (4N) gold processed by equal-channel angu- lar pressing using routes A or Bc. Using atomic force. Published by Elsevier Ltd. All rights reserved. Keywords: Atomic force microscopy (AFM); X-ray diffraction

Gubicza, Jenõ

289

THE HISTORY OF OLIVE OIL1 "The whole Mediterranean, the sculpture, the palm, the gold  

E-Print Network (OSTI)

THE HISTORY OF OLIVE OIL1 "The whole Mediterranean, the sculpture, the palm, the gold beads ANNA LINDH FOUNDATION POLICY ANALYSIS 1:1. THE HISTORY OF OLIVE OIL February 20, 2008 EUROMED Sustainable Connections: 1.1 The History of Olive oil 1 #12;contend that the Mesopotamian Fertile Crescent

Zaferatos, Nicholas C.

290

Gold nanoparticles: promising nanomaterials for the diagnosis of cancer and HIV/AIDS  

Science Conference Proceedings (OSTI)

Gold nanoparticles (AuNPs) are currently playing a significant role for human welfare in the field of clinical diagnosis as well as several biomedical applications. More and more research shows that AuNPs-based technologies are becoming promising approaches ...

Anil Kumar; Bhargavi Mazinder Boruah; Xing-Jie Liang

2011-01-01T23:59:59.000Z

291

EPRI Power Electronics-Based Transmission Controllers Reference Book ("The Gold Book")  

Science Conference Proceedings (OSTI)

EPRI is sponsoring development of a first edition of the EPRI Power Electronics-Based Transmission Controllers Reference Book. This report is the most recent draft of a chapter for the "Gold Book," an authoritative guide for utilities and others who install and maintain power electronics equipment to increase power transfer capability.

2009-12-23T23:59:59.000Z

292

Opacity measurement of a gold plasma at T{sub e} = 85 eV  

SciTech Connect

The opacity of a gold plasma at the temperature of 85 eV and density of 0.02 g/cm{sup 3} was measured over the energy range from 150 eV to 1200 eV. The gold sample was heated by thermal x-ray radiation generated with a foam-baffled gold cavity. The sample transmission was obtained from the backlight, absorption and self-emission spectra measured by a time-gated, spatially resolved grating spectrometer, with the backlight and absorption spectra being measured simultaneously in a single shot and the self-emission in another shot. The temperature and density of the gold absorber were determined by the hydrodynamic simulation with Multi-1D code, which was partially tested by the reemission radiative flux measurements of the heated sample. This work permits the first test of opacity models over the photon energy range that dominates the Rosseland mean opacity at the temperature of interest for the inertial confinement fusion.

Zhang Jiyan; Yang Jiamin; Yang Guohong; Li Hang; Yuan Zheng; Zhao Yang; Xiong Gang; Bao Lihua; Huang Chenwu; Ding Yongkun; Zhang Baohan; Zheng Zhijian [Research Center of Laser Fusion, P. O. Box 919-986, Mianyang 621900 (China); Xu Yan; Wu Zheqing; Yan Jun [Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China)

2011-11-15T23:59:59.000Z

293

A Compact Parallel-plane Perpendicular-current Feed for a Modified Equiangular Spiral Antenna and Related Circuits  

E-Print Network (OSTI)

This work describes the design and measurement of a compact bidirectional ultrawideband (UWB) modified equiangular spiral antenna with an integrated feed internally matched to a 50-Ohm microstrip transmission line. A UWB transition from microstrip to double-sided parallel-strip line (DSPSL) soldered to a short (1.14 mm) twin-line transmission line feeds the spiral. The currents on the feed travel in a direction approximately perpendicular to the direction of the currents on the spiral at the points where the feed passes the spiral in close proximity (0.57 mm). Holes were etched from the metal arms of the spiral to reduce the impedance mismatch caused by coupling between the transmission line feed and the spiral. This work also describes a low-loss back-to-back transition from coaxial line to DSPSL, an in-phase connectorized 3 dB DSPSL power divider made using three of those transitions, a 2:1 in-phase DSPSL power divider, a 3:1 in-phase DSPSL power divider, a radial dipole fed by DSPSL, an array of those dipoles utilizing the various power dividers, and a UWB circular monopole antenna fed by DSPSL. Measured and simulated results show good agreement for the designed antennas and circuits.

Eubanks, Travis Wayne

2010-05-01T23:59:59.000Z

294

X-RAY BINARIES AND STAR CLUSTERS IN THE ANTENNAE: OPTICAL CLUSTER COUNTERPARTS  

SciTech Connect

We compare the locations of 82 X-ray binaries (XRBs) detected in the merging Antennae galaxies by Zezas et al., based on observations taken with the Chandra X-Ray Observatory, with a catalog of optically selected star clusters presented by Whitmore et al., based on observations taken with the Hubble Space Telescope. Within the 2{sigma} positional uncertainty of Almost-Equal-To 0.''8, we find 22 XRBs are coincident with star clusters, where only two to three chance coincidences are expected. The ages of the clusters were estimated by comparing their UBVI, H{alpha} colors with predictions from stellar evolutionary models. We find that 14 of the 22 coincident XRBs (64%) are hosted by star clusters with ages of Almost-Equal-To 6 Myr or less. All of the very young host clusters are fairly massive and have M {approx}> 3 Multiplication-Sign 10{sup 4} M {sub Sun }, with many having masses M Almost-Equal-To 10{sup 5} M {sub Sun }. Five of the XRBs are hosted by young clusters with ages {tau} Almost-Equal-To 10-100 Myr, while three are hosted by intermediate-age clusters with {tau} Almost-Equal-To 100-300 Myr. Based on the results from recent N-body simulations, which suggest that black holes are far more likely to be retained within their parent clusters than neutron stars, we suggest that our sample consists primarily of black hole binaries with different ages.

Rangelov, Blagoy; Chandar, Rupali [Department of Physics and Astronomy, University of Toledo, Toledo, OH 43606 (United States); Prestwich, Andrea [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Whitmore, Bradley C., E-mail: blagoy.rangelov@gmail.com [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)

2012-10-20T23:59:59.000Z

295

Computational modeling study of the radial line slot antenna microwave plasma source with comparisons to experiments  

SciTech Connect

The radial line slot antenna plasma source is a high-density microwave plasma source comprising a high electron temperature source region within the plasma skin depth from a coupling window and low electron temperature diffusion region far from the window. The plasma is typically comprised of inert gases like argon and mixtures of halogen or fluorocarbon gases for etching. Following the experimental study of Tian et al.[J. Vac. Sci. Technol. A 24, 1421 (2006)], a two-dimensional computational model is used to describe the essential features of the source. A high density argon plasma is described using the quasi-neutral approximation and coupled to a frequency-domain electromagnetic wave solver to describe the plasma-microwave interactions in the source. The plasma is described using a multispecies plasma chemistry mechanism developed specifically for microwave excitation conditions. The plasma is nonlocal by nature with locations of peak power deposition and peak plasma density being very different. The spatial distribution of microwave power coupling depends on whether the plasma is under- or over-dense and is described well by the model. The model predicts the experimentally observed low-order diffusion mode radial plasma profiles. The trends of spatial profiles of electron density and electron temperature over a wide range of power and pressure conditions compare well with experimental results.

Raja, Laxminarayan L. [Department of Aerospace Engineering and Engineering Mechanics, University of Texas at Austin, Austin, Texas 78712 (United States); Mahadevan, Shankar [Esgee Technologies Inc., 1301 S. Capital of Texas Hwy. Suite B-122, Austin, Texas 78746 (United States); Ventzek, Peter L. G.; Yoshikawa, Jun [Tokyo Electron Ltd., Akasaka Biz Tower, 3-1 Akasaka 5-chome, Minato-ku, Tokyo 107-6325 (Japan)

2013-05-15T23:59:59.000Z

296

The continued development of the Spallation Neutron Source external antenna H{sup -} ion source  

Science Conference Proceedings (OSTI)

The U.S. Spallation Neutron Source (SNS) is an accelerator-based, pulsed neutron-scattering facility, currently in the process of ramping up neutron production. In order to ensure that the SNS will meet its operational commitments as well as provide for future facility upgrades with high reliability, we are developing a rf-driven, H{sup -} ion source based on a water-cooled, ceramic aluminum nitride (AlN) plasma chamber. To date, early versions of this source have delivered up to 42 mA to the SNS front end and unanalyzed beam currents up to {approx}100 mA (60 Hz, 1 ms) to the ion source test stand. This source was operated on the SNS accelerator from February to April 2009 and produced {approx}35 mA (beam current required by the ramp up plan) with availability of {approx}97%. During this run several ion source failures identified reliability issues, which must be addressed before the source re-enters production: plasma ignition, antenna lifetime, magnet cooling, and cooling jacket integrity. This report discusses these issues, details proposed engineering solutions, and notes progress to date.

Welton, R. F.; Carmichael, J.; Fuga, R.; Goulding, R. H.; Han, B.; Kang, Y.; Lee, S. W.; Murray, S. N.; Pennisi, T.; Potter, K. G.; Santana, M.; Stockli, M. P. [Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37830-6471 (United States); Desai, N. J. [Worcester Polytechnic Institute, Worcester, Massachusetts 01609 (United States)

2010-02-15T23:59:59.000Z

297

A TECHNIQUE FOR PRIMARY BEAM CALIBRATION OF DRIFT-SCANNING, WIDE-FIELD ANTENNA ELEMENTS  

SciTech Connect

We present a new technique for calibrating the primary beam of a wide-field, drift-scanning antenna element. Drift-scan observing is not compatible with standard beam calibration routines, and the situation is further complicated by difficult-to-parameterize beam shapes and, at low frequencies, the sparsity of accurate source spectra to use as calibrators. We overcome these challenges by building up an interrelated network of source 'crossing points'-locations where the primary beam is sampled by multiple sources. Using the single assumption that a beam has 180 Degree-Sign rotational symmetry, we can achieve significant beam coverage with only a few tens of sources. The resulting network of crossing points allows us to solve for both a beam model and source flux densities referenced to a single calibrator source, circumventing the need for a large sample of well-characterized calibrators. We illustrate the method with actual and simulated observations from the Precision Array for Probing the Epoch of Reionization.

Pober, Jonathan C.; Parsons, Aaron R. [Astronomy Department, University of California, Berkeley, CA (United States); Jacobs, Daniel C. [School of Earth and Space Exploration, Arizona State University, Tempe, AZ (United States); Aguirre, James E.; Moore, David F. [Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA (United States); Bradley, Richard F.; Parashare, Chaitali R. [Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, VA (United States); Carilli, Chris L. [National Radio Astronomy Observatory, Socorro, NM (United States); Gugliucci, Nicole E. [Department of Astronomy, University of Virginia, Charlottesville, VA (United States)

2012-02-15T23:59:59.000Z

298

Implications of mining practices in an open-pit gold mine for monitoring of a comprehensive test-ban treaty  

SciTech Connect

This report summarizes the results of an experiment at the Gold Quarry pit, operated by the Newmont Gold Company at Carlin, NV The purpose of the experiment was to obtain local and regional seismic data, together with ``ground truth``, from conventional surface blasting activity and to use these data to help determine the effectiveness with which conventional mining blasts can be discriminated from underground nuclear explosions.

Jarpe, S.P.; Moran, B.; Goldstein, P.; Glenn, L.A.

1996-01-01T23:59:59.000Z

299

LAGRANGE: LAser GRavitational-wave ANtenna at GEo-lunar Lagrange points  

E-Print Network (OSTI)

We describe a new space gravitational wave observatory design called LAGRANGE that maintains all important LISA science at about half the cost and with reduced technical risk. It consists of three drag-free spacecraft in the most stable geocentric formation, the Earth-Moon L3, L4, and L5 Lagrange points. Fixed antennas allow continuous contact with the Earth, solving the problem of communications bandwidth and latency. A 70 mm diameter AuPt sphere with a 35 mm gap to its enclosure serves as a single inertial reference per spacecraft, which is operated in "true" drag-free mode (no test mass forcing). This is the core of the Modular Gravitational Reference Sensor whose other advantages are: a simple caging design based on the DISCOS 1972 drag-free mission, an all optical read-out with pm fine and nm coarse sensors, and the extensive technology heritage from the Honeywell gyroscopes, and the DISCOS and Gravity Probe B drag-free sensors. An Interferometric Measurement System, designed with reflective optics and a highly stabilized frequency standard, performs the inter-test mass ranging and requires a single optical bench with one laser per spacecraft. Two 20 cm diameter telescopes per spacecraft, each with in-field pointing, incorporate novel technology developed for advanced optical systems by Lockheed Martin, who also designed the spacecraft based on a multi-flight proven bus structure. Additional technological advancements include the drag-free propulsion, thermal control, charge management systems, and materials. LAGRANGE sub-systems are designed to be scalable and modular, making them interchangeable with those of LISA or other gravitational science missions. We plan to space qualify critical technologies on small and nano satellite flights, with the first launch (UV-LED Sat) in 2013.

J. W. Conklin; S. Buchman; V. Aguero; A. Alfauwaz; A. Aljadaan; M. Almajed; H. Altwaijry; T. Al-Saud; K. Balakrishnan; R. L. Byer; K. Bower; B. Costello; G. D. Cutler; D. B. DeBra; D. M. Faied; C. Foster; A. L. Genova; J. Hanson; K. Hooper; E. Hultgren; B. Jaroux; A. Klavins; B. Lantz; J. A. Lipa; A. Palmer; B. Plante; H. S. Sanchez; S. Saraf; D. Schaechter; T. Sherrill; K. -L. Shu; E. Smith; D. Tenerelli; R. Vanbezooijen; G. Vasudevan; S. D. Williams; S. P. Worden; J. Zhou; A. Zoellner

2011-11-22T23:59:59.000Z

300

Two-atom system as a nano-antenna for mode switching and light routing  

E-Print Network (OSTI)

We determine how a system composed of two nonidentical two-level atoms with different resonance frequencies and different damping rates could work as a nano-antenna for controlled mode switching and light routing. We calculate the angular distribution of the emitted field detected in a far-field zone of the system including the direct interatomic interactions and arbitrary linear dimensions of the system. The calculation is carried out in terms of the symmetric and antisymmetric modes of the two atom system. We find that as long as the atoms are identical, the emission cannot be switched between the symmetric and antisymmetric modes. The switching may occur when the atoms are non-identical and the emission can then be routed to different modes by changing the relative ratio of the atomic frequencies, or damping rates or by a proper tuning of the laser frequency to the atomic resonance frequencies. It is shown that in the case of atoms of different resonance frequencies but equal damping rates, the light routing is independent of the frequency of the driving laser field. It depends only on the sign of the detuning between the atomic resonance frequencies. In the case of atoms of different damping rates, the emission can be switched between different modes by changing the laser frequency from the blue to red detuned from the atomic resonance. The effect of the interatomic interactions is also considered and it is found that in the case of unequal resonance frequencies of the atoms, the interactions slightly modify the visibility of the intensity pattern. The case of unequal damping rates of the atoms is affected rather more drastically, the light routing becoming asymmetric under the dipole-dipole interaction with the enhanced intensities of the modes turned towards the atom of smaller damping rate.

Vassilis E. Lembessis; Anwar Al Rsheed; Omar M. Aldossary; Zbigniew Ficek

2013-09-16T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" 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.
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301

Department of Energy - Gold Award Press Release 9/10/2003  

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

Francis Collins and Ari Patrinos Receive Energy Secretary's Francis Collins and Ari Patrinos Receive Energy Secretary's Gold Award for Human Genome Project Leadership September 10, 2003 WASHINGTON, DC -- Secretary of Energy Spencer Abraham today presented Francis Collins and Aristides Patrinos with the Secretary's Gold Award for their leadership of the government's Human Genome Project. Francis Collins is the director of the National Human Genome Research Institute at the National Institutes of Health, Department of Health and Human Services. Ari Patrinos heads the Office of Biological and Environmental Research at the Department of Energy's (DOE) Office of Science. The award is the Energy Department's highest honorary award and includes a plaque with citation, a medallion and a rosette. Secretary Abraham presented Drs. Collins and Patrinos with the award in a ceremony at DOE headquarters. Director of the National Institutes of Health Elias Zerhouni represented the Department of Health and Human Services at the ceremony.

302

Microsoft Word - CX-Rogue-GoldBeach-DisconnectSwitch-FY13_WEB.docx  

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

8, 2013 8, 2013 REPLY TO ATTN OF: KEPR-4 SUBJECT: Environmental Clearance Memorandum Gregory L Vassallo Electical Engineer - TPCV-ALVEY Proposed Action: Rogue-Gold Beach No. 2 disconnect switch replacement Pollution Prevention and Abatement Project No.: 2411 Categorical Exclusion Applied (from Subpart D, 10 C.F.R. Part 1021): B4.6 Additions and modifications to transmission facilities Location: Curry County, Oregon Proposed by: Bonneville Power Administration (BPA) Description of the Proposed Action: BPA and Coos-Curry Electric Cooperative, Inc. (Coos- Curry) have developed a joint plan to replace the existing B-1734 115-kilovolt, group-operated disconnect switch located at BPA's Gold Beach Substation with a new horizontally-mounted,

303

Technology demonstration for reducing mercury emissions from small-scale gold refining facilities.  

SciTech Connect

Gold that is brought from artisanal and small-scale gold mining areas to gold shops for processing and sale typically contains 5-40% mercury. The uncontrolled removal of the residual mercury in gold shops by using high-temperature evaporation can be a significant source of mercury emissions in urban areas where the shops are located. Emissions from gold shop hoods during a burn can exceed 1,000 mg/m{sup 3}. Because the saturation concentration of mercury vapor at operating temperatures at the hood exhaust is less than 100 mg/m{sup 3}, the dominant component of the exhaust is in the form of aerosol or liquid particles. The U.S. Environmental Protection Agency (EPA), with technical support from Argonne National Laboratory (Argonne), has completed a project to design and test a technology to remove the dominant aerosol component in the emissions from gold shops. The objective was to demonstrate a technology that could be manufactured at low cost and by using locally available materials and manufacturing capabilities. Six prototypes designed by Argonne were locally manufactured, installed, and tested in gold shops in Itaituba and Creporizao, Brazil. The initial prototype design incorporated a pebble bed as the media for collecting the mercury aerosols, and a mercury collection efficiency of over 90% was demonstrated. Though achieving high efficiencies, the initial prototype was determined to have practical disadvantages such as excessive weight, a somewhat complex construction, and high costs (>US$1,000). To further simplify the construction, operation, and associated costs, a second prototype design was developed in which the pebble bed was replaced with slotted steel baffle plates. The system was designed to have flexibility for installation in various hood configurations. The second prototype with the baffle plate design was installed and tested in several different hood/exhaust systems to determine the optimal installation configuration. The significance of coagulation and collection of the mercury aerosols in exhaust ducts, which is dependent on the hood and collector configuration, was also evaluated. Prototype demonstration tests verified the theoretical basis for mercury aerosol capture that can be used to optimize the baffle plate design, flow rates, and hood exhaust ducts and plenum to achieve 80% or higher removal efficiencies. Results indicated that installation configuration significantly influences a system's capture efficiency. Configurations that retained existing inlet ducts resulted in system efficiencies of more than 80%, whereas installation configurations without inlet ducts significantly reduced capture efficiency. As an alternative to increasing the volume of inlet ducts, the number of baffle plates in the system baffle assembly could be doubled to increase efficiency. Recommended installation and operation procedures were developed on the basis of these results. A water-based mercury capture system developed in Indonesia for installation in smaller shops was also tested and shown to be effective for certain applications. The cost of construction and installation of the baffle plate prototype was approximately US$400. These costs were reported as acceptable by local gold shop owners and government regulators, and were significantly lower than the cost of an alternate charcoal/copper mesh mercury filter available in the region, which costs about US$10,000. A sampling procedure that consists of a particle filter combined with a vapor analyzer was demonstrated as an effective procedure for analyzing both the aerosol and vapor components of the mercury concentrations. Two key findings for enhancing higher mercury collection were identified. First, the aerosol/vapor mercury emissions must be given sufficient time for the mercury particles to coagulate to a size that can be readily captured by the baffle plates. An interval of at least 6 seconds of transit time between the point of evaporation and contact with the slotted baffle plates is recommended. Some particles will also deposit in the exhaust ducts

Habegger, L. J.; Fernandez, L. E.; Engle, M.; Bailey, J. L.; Peterson, D. P.; MacDonell, M. M.; U.S. Environmental Protection Agency

2008-06-30T23:59:59.000Z

304

Technology demonstration for reducing mercury emissions from small-scale gold refining facilities.  

Science Conference Proceedings (OSTI)

Gold that is brought from artisanal and small-scale gold mining areas to gold shops for processing and sale typically contains 5-40% mercury. The uncontrolled removal of the residual mercury in gold shops by using high-temperature evaporation can be a significant source of mercury emissions in urban areas where the shops are located. Emissions from gold shop hoods during a burn can exceed 1,000 mg/m{sup 3}. Because the saturation concentration of mercury vapor at operating temperatures at the hood exhaust is less than 100 mg/m{sup 3}, the dominant component of the exhaust is in the form of aerosol or liquid particles. The U.S. Environmental Protection Agency (EPA), with technical support from Argonne National Laboratory (Argonne), has completed a project to design and test a technology to remove the dominant aerosol component in the emissions from gold shops. The objective was to demonstrate a technology that could be manufactured at low cost and by using locally available materials and manufacturing capabilities. Six prototypes designed by Argonne were locally manufactured, installed, and tested in gold shops in Itaituba and Creporizao, Brazil. The initial prototype design incorporated a pebble bed as the media for collecting the mercury aerosols, and a mercury collection efficiency of over 90% was demonstrated. Though achieving high efficiencies, the initial prototype was determined to have practical disadvantages such as excessive weight, a somewhat complex construction, and high costs (>US$1,000). To further simplify the construction, operation, and associated costs, a second prototype design was developed in which the pebble bed was replaced with slotted steel baffle plates. The system was designed to have flexibility for installation in various hood configurations. The second prototype with the baffle plate design was installed and tested in several different hood/exhaust systems to determine the optimal installation configuration. The significance of coagulation and collection of the mercury aerosols in exhaust ducts, which is dependent on the hood and collector configuration, was also evaluated. Prototype demonstration tests verified the theoretical basis for mercury aerosol capture that can be used to optimize the baffle plate design, flow rates, and hood exhaust ducts and plenum to achieve 80% or higher removal efficiencies. Results indicated that installation configuration significantly influences a system's capture efficiency. Configurations that retained existing inlet ducts resulted in system efficiencies of more than 80%, whereas installation configurations without inlet ducts significantly reduced capture efficiency. As an alternative to increasing the volume of inlet ducts, the number of baffle plates in the system baffle assembly could be doubled to increase efficiency. Recommended installation and operation procedures were developed on the basis of these results. A water-based mercury capture system developed in Indonesia for installation in smaller shops was also tested and shown to be effective for certain applications. The cost of construction and installation of the baffle plate prototype was approximately US$400. These costs were reported as acceptable by local gold shop owners and government regulators, and were significantly lower than the cost of an alternate charcoal/copper mesh mercury filter available in the region, which costs about US$10,000. A sampling procedure that consists of a particle filter combined with a vapor analyzer was demonstrated as an effective procedure for analyzing both the aerosol and vapor components of the mercury concentrations. Two key findings for enhancing higher mercury collection were identified. First, the aerosol/vapor mercury emissions must be given sufficient time for the mercury particles to coagulate to a size that can be readily captured by the baffle plates. An interval of at least 6 seconds of transit time between the point of evaporation and contact with the slotted baffle plates is recommended. Some particles will also deposit in the exhaust ducts

Habegger, L. J.; Fernandez, L. E.; Engle, M.; Bailey, J. L.; Peterson, D. P.; MacDonell, M. M.; U.S. Environmental Protection Agency

2008-06-30T23:59:59.000Z

305

Benchmark Measurements of the Ionization Balance of Non-LTE Gold  

SciTech Connect

The authors present a series of benchmark measurements of the ionization balance of well characterized gold plasmas with and without external radiation fields at electron densities near 10{sup 21} cm{sup -3} and various electron temperatures spanning the range 0.8 to 2.4 keV. They have analyzed time- and space-resolved M-shell gold emission spectra using a sophisticated collisional-radiative model with hybrid level structure, finding average ion changes ranging from 42 to 50. At the lower temperatures, the spectra exhibit significant sensitivity to external radiation fields and include emission features from complex N-shell ions not previously studied at these densities. The measured spectra and inferred provide a stringent test for non-local thermodynamic equilibrium (non-LTE) models of complex high-Z ions.

Heeter, R F; Hansen, S B; Fournier, K B; Foord, M E; Froula, D H; Mackinnon, A J; May, M J; Schneider, M B; Young, B F

2007-04-20T23:59:59.000Z

306

Solar Companies Go for the Gold with SunShot Incubator | Department of  

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

Solar Companies Go for the Gold with SunShot Incubator Solar Companies Go for the Gold with SunShot Incubator Solar Companies Go for the Gold with SunShot Incubator July 26, 2012 - 9:45am Addthis William Parish from Solar Mosaic, one of nine solar startups chosen for the latest round of SunShot Incubator funding, discusses his company’s project with Energy Secretary Steven Chu at the SunShot Grand Challenge Summit in Denver, Colorado. | Photo by John De La Rosa. William Parish from Solar Mosaic, one of nine solar startups chosen for the latest round of SunShot Incubator funding, discusses his company's project with Energy Secretary Steven Chu at the SunShot Grand Challenge Summit in Denver, Colorado. | Photo by John De La Rosa. Minh Le Minh Le Program Manager, Solar Program What does this project do? The sixth iteration of the SunShot Incubator program will support

307

Go for the Gold and Save Energy at Home | Department of Energy  

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

Go for the Gold and Save Energy at Home Go for the Gold and Save Energy at Home Go for the Gold and Save Energy at Home August 15, 2012 - 4:53pm Addthis Amanda McAlpin The Olympic games just drew to a close; it's been an exciting time to be a citizen of the world. Watching them is always inspiring and energizing to me. It's motivation to go to the gym, learn something new, or revisit my own goals. Saving energy has always been an important goal for me, but it can be easy to lose be less mindful of it as I go about my daily life. Why not use this time to set some new energy goals for yourself, or to revisit the some old habits. Remind yourself of the little things you do every day to save energy, the habits that might have gotten a little lax with time. Do you still turn off the lights when you leave a room? Do you unplug appliances and power

308

Enhanced light-matter interaction in graphene-covered gold nanovoid arrays  

E-Print Network (OSTI)

The combination of graphene with noble-metal nanostructures is currently being explored for strong light-graphene interaction enhanced by plasmons. We introduce a novel hybrid graphene-metal system for studying light-matter interactions with gold-void nanostructures exhibiting resonances in the visible range. Strong coupling of graphene layers to the plasmon modes of the nanovoid arrays results in significant frequency shifts of the underlying plasmon resonances, enabling more than 30% absolute light absorption in a single layer of graphene and up to 700-fold enhancement of the Raman response of the graphene. These new perspectives enable us to verify the presence of graphene on gold-void arrays and the enhancement even allows us to accurately quantify the number of layers. Experimental observations are further supported by numerical simulations and perturbation-theory analysis. The graphene gold-void platform is beneficial for sensing of molecules and placing R6G dye molecules on top of the graphene, we obse...

Zhu, Xiaolong; Schmidt, Michael S; Boisen, Anja; Hansen, Ole; Zi, Jian; Xiao, Sanshui; Mortensen, N Asger

2013-01-01T23:59:59.000Z

309

Validation for 2D/3D registration I: A new gold standard data set  

Science Conference Proceedings (OSTI)

Purpose: In this article, the authors propose a new gold standard data set for the validation of two-dimensional/three-dimensional (2D/3D) and 3D/3D image registration algorithms. Methods: A gold standard data set was produced using a fresh cadaver pig head with attached fiducial markers. The authors used several imaging modalities common in diagnostic imaging or radiotherapy, which include 64-slice computed tomography (CT), magnetic resonance imaging using Tl, T2, and proton density sequences, and cone beam CT imaging data. Radiographic data were acquired using kilovoltage and megavoltage imaging techniques. The image information reflects both anatomy and reliable fiducial marker information and improves over existing data sets by the level of anatomical detail, image data quality, and soft-tissue content. The markers on the 3D and 2D image data were segmented using ANALYZE 10.0 (AnalyzeDirect, Inc., Kansas City, KN) and an in-house software. Results: The projection distance errors and the expected target registration errors over all the image data sets were found to be less than 2.71 and 1.88 mm, respectively. Conclusions: The gold standard data set, obtained with state-of-the-art imaging technology, has the potential to improve the validation of 2D/3D and 3D/3D registration algorithms for image guided therapy.

Pawiro, S. A.; Markelj, P.; Pernus, F.; Gendrin, C.; Figl, M.; Weber, C.; Kainberger, F.; Noebauer-Huhmann, I.; Bergmeister, H.; Stock, M.; Georg, D.; Bergmann, H.; Birkfellner, W. [Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, AKH-4L, Waehringer Guertel 18-20, Vienna A-1090 (Austria); Laboratory of Imaging Technologies, Faculty of Electrical Engineering, University of Ljubljana, Trzaska Cesta 25, Ljubljana SI-1000 (Slovenia); Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, AKH-4L, Waehringer Guertel 18-20, Vienna A-1090 (Austria); University Clinic of Radiology, Division of Osteoradiology, Medical University of Vienna, AKH-4L, Waehringer Guertel 18-20, Vienna A-1090 (Austria); Department of Biomedical Research, Medical University Vienna, AKH-4L, Waehringer Guertel 18-20, Vienna A-1090 (Austria); University Clinic of Radiotherapy, Division of Medical Radiation Physics, Medical University of Vienna, Waehringer Guertel 18-20, AKH, Vienna A-1090 (Austria); Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, AKH-4L, Waehringer Guertel 18-20, Vienna A-1090 (Austria)

2011-03-15T23:59:59.000Z

310

Solar Companies Go for the Gold with SunShot Incubator | Department of  

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

Solar Companies Go for the Gold with SunShot Incubator Solar Companies Go for the Gold with SunShot Incubator Solar Companies Go for the Gold with SunShot Incubator July 26, 2012 - 9:45am Addthis William Parish from Solar Mosaic, one of nine solar startups chosen for the latest round of SunShot Incubator funding, discusses his company’s project with Energy Secretary Steven Chu at the SunShot Grand Challenge Summit in Denver, Colorado. | Photo by John De La Rosa. William Parish from Solar Mosaic, one of nine solar startups chosen for the latest round of SunShot Incubator funding, discusses his company's project with Energy Secretary Steven Chu at the SunShot Grand Challenge Summit in Denver, Colorado. | Photo by John De La Rosa. Minh Le Minh Le Program Manager, Solar Program What does this project do? The sixth iteration of the SunShot Incubator program will support

311

Diffraction analysis of a double-shielded antenna in theFraunhofer and Fresnel regimes: Model predictions  

DOE Green Energy (OSTI)

We analytically investigate the use of a wire mesh ground screen (fence) and a halo of extension panels around a helically fed parabolic reflector in order to estimate the ground contribution to the antenna noise temperature in an experiment aimed at surveying the sky at decimeter wavelengths. We use geometric diffraction theory to model the effect of these screening and blocking shields when scanning in azimu that tilt angles from zenith in the range 0 degrees greater than or equal to Z greater than or equal to 45 degrees. We report estimates based on existing formulas for monofilar axial-mode helical antennas with expected low-level sidelobes in the direction of the halo region. As long as there is no significant coupling between the near-field patterns of both the feed and the diffracting halo, estimates using the Fraunhofer approximation agree with those calculated with the Fresnel approach at a tilt angle Z(eq), which increases with the proximity of the diffracting edge from the near-/far-field boundary of the feed pattern. Our estimates show that for a fence of some IO-dB attenuation and high enough to level out the horizon profile at the prime focus of the antenna, the diffracted components dominate the contribution for tilt angles Z less than or similar to 35 degrees. The fence is the main diffractor when Z greater than or similar to 20 degrees, but for Z greater than or similar to 25 degrees its contribution becomes insensitive to the presence of the halo. On the other hand, if the attenuation is low (<1dB), the increase in ground solid angle with tilt angle makes the contribution due to transmission and ground exposure the dominant one.

Tello, C.; Villela, T.; Wuensche, C.A.; Figueiredo, N.; Torres,S.; Bersanelli, M.; Bensadoun, M.; De Amici, G.; Smoot, G.F.

1999-01-01T23:59:59.000Z

312

Investigations on loop antenna excited whistler waves in a cylindrical plasma based on laboratory experiments and simulations  

Science Conference Proceedings (OSTI)

Experimental investigations and simulations of loop antenna excited whistler waves in a cylindrical low temperature plasma are presented. Experiments are performed in the VINETA [Franck et al., Plasma Sources Sci. Technol. 14, 226 (2005)] device and simulations are generated using IPF-FD3D [C. Lechte, IEEE Trans. Plasma Sci. 37, 1099 (2009)], an implementation of the Yee-algorithm. A good agreement of the experiment and the simulation is found. The simulation is used to predict the spatial structure of the wave, the dominant source of the electric field, the relative contribution of electron, and displacement current as well as parallel and perpendicular currents to the magnetic field of the wave.

Pfannmoeller, J. P. [Max-Planck-Institut fuer Plasmaphysik, EURATOM Assoziation, Greifswald (Germany); Lechte, C. [Institut fuer Plasmaforschung, Stuttgart (Germany); Grulke, O.; Klinger, T. [Max-Planck-Institut fuer Plasmaphysik, EURATOM Assoziation, Greifswald (Germany); Ernst-Moritz-Arndt Universitaet, Greifswald (Germany)

2012-10-15T23:59:59.000Z

313

Synthesis of gold nano-particles in a microfluidic platform for water quality monitoring applications  

E-Print Network (OSTI)

A microfluidic lab-on-a-chip (LOC) device for in-situ synthesis of gold nano-particles was developed. The long term goal is to develop a portable hand-held diagnostic platform for monitoring water quality (e.g., detecting metal ion pollutants). The LOC consists of micro-chambers housing different reagents and samples that feed to a common reaction chamber. The reaction products are delivered to several waste chambers in a pre-defined sequence to enable reagents/ samples to flow into and out of the reaction chamber. Passive flow actuation is obtained by capillary driven flow (wicking) and dissolvable microstructures called salt pillars. The LOC does not require any external power source for actuation and the passive microvalves enable flow actuation at predefined intervals. The LOC and the dissolvable microstructures are fabricated using a combination of photolithography and soft lithography techniques. Experiments were conducted to demonstrate the variation in the valve actuation time with respect to valve position and geometric parameters. Subsequently, analytical models were developed using one dimensional linear diffusion theory. The analytical models were in good agreement with the experimental data. The microvalves were developed using various salts: polyethylene glycol, sodium chloride and sodium acetate. Synthesized in-situ in our experiments, gold nano-particles exhibit specific colorimetric and optical properties due to the surface plasmon resonance effect. These stabilized mono-disperse gold nano-particles can be coated with bio-molecular recognition motifs on their surfaces. A colorimetric peptide assay was thus developed using the intrinsic property of noble metal nano-particles. The LOC device was further developed on a paper microfluidics platform. This platform was tested successfully for synthesis of gold nano-particles using a peptide assay and using passive salt-bridge microvalves. This study proves the feasibility of a LOC device that utilizes peptide assay for synthesis of gold nano-particles in-situ. It could be highly significant in a simple portable water quality monitoring platform.

Datta, Sayak

2008-12-01T23:59:59.000Z

314

Environmental Assessment for Leasing Land for the Siting, Construction and Operation of a Commercial AM Radio Antenna at Los Alamos National Laboratory, Los Alamos, NM  

Science Conference Proceedings (OSTI)

The United States (U.S.) Department of Energy (DOE) proposes to lease approximately 3 acres of land at the Los Alamos National Laboratory (LANL) on the southeast tip of Technical Area (TA) 54 for the siting, construction and operation of an AM radio broadcasting antenna. This Environmental Assessment (EA) has been developed in order to assess the environmental effects of the Proposed Action and No Action alternative. The Proposed Action includes the lease of land for the siting, construction and operation of an AM radio broadcasting antenna in TA-54, just north of Pajarito Road and State Highway 4. The No Action Alternative was also considered. Under the No Action Alternative, DOE would not lease land on LANL property for the siting and operation of an AM radio broadcasting antenna; the DOE would not have a local station for emergency response use; and the land would continue to be covered in native vegetation and serve as a health and safety buffer zone for TA-54 waste management activities. Other potential sites on LANL property were evaluated but dismissed for reasons such as interference with sensitive laboratory experiments. Potential visual, health, and environmental effects are anticipated to be minimal for the Proposed Action. The radio broadcasting antenna would be visible against the skyline from some public areas, but would be consistent with other man-made objects in the vicinity that partially obstruct viewsheds (e.g. meteorological tower, power lines). Therefore, the net result would be a modest change of the existing view. Electromagnetic field (EMF) emissions from the antenna would be orders or magnitude less than permissible limits. The proposed antenna construction would not affect known cultural sites, but is located in close proximity to two archaeological sites. Construction would be monitored to ensure that the associated road and utility corridor would avoid cultural sites.

N /A

2000-02-16T23:59:59.000Z

315

Spatial Averaging of Fields from Half-wave Dipole Antennas and Corresponding SAR Calculations in the NORMAN Human Voxel Model Betwee n 65 MHz and 2 GHz  

Science Conference Proceedings (OSTI)

Status: Published Citation: Findlay, RP; and Dimbylow, PJ. 2009. Spatial Averaging of Fields from Half-wave Dipole Antennas and Corresponding SAR Calculations in the NORMAN Human Voxel Model Between 65 MHz and 2 GHz. In Physics in Medicine and Biology, Volume 54, Number 8, 2009, pp. 2437-2447. This RF exposure research is the second part of SAR modelling work by the Health Protection Agency in the UK. The paper addresses SAR modelling for non-uniform RF exposure conditions. When an antenna is located clo...

2009-04-30T23:59:59.000Z

316

Parameter assignment for improved connectivity and security in randomly deployed wireless sensor networks via hybrid omni/uni-directional antennas  

E-Print Network (OSTI)

Conguring a network system to operate at optimal levels of performance re-quires a comprehensive understanding of the eects of a variety of system parameterson crucial metrics like connectivity and resilience to network attacks. Traditionally,omni-directional antennas have been used for communication in wireless sensor net-works. In this thesis, a hybrid communication model is presented where-in, nodes ina network are capable of both omni-directional and uni-directional communication.The eect of such a model on performance in randomly deployed wireless sensor net-works is studied, specically looking at the eect of a variety of network parameterson network performance.The work in this thesis demonstrates that, when the hybrid communication modelis employed, the probability of 100% connectivity improves by almost 90% and thatof k-connectivity improves by almost 80% even at low node densities when comparedto the traditional omni-directional model. In terms of network security, it was foundthat the hybrid approach improves network resilience to the collision attack by almost85% and the cost of launching a successful network partition attack was increased byas high as 600%. The gains in connectivity and resilience were found to improve withincreasing node densities and decreasing antenna beamwidths.

Shankar, Sonu

2008-08-01T23:59:59.000Z

317

Heat capacity of quantum adsorbates: Hydrogen and helium on evaporated gold films  

DOE Green Energy (OSTI)

The author has constructed an apparatus to make specific heat measurements of quantum gases adsorbed on metallic films at temperatures between 0.3 and 4 K. He has used this apparatus to study quench-condensed hydrogen films between 4 and 923 layers thick with J = 1 concentrations between 0.28 and 0.75 deposited on an evaporated gold surface. He has observed that the orientational ordering of the J = 1 molecules depends on the substrate temperature during deposition of the hydrogen film. He has inferred that the density of the films condensed at the lowest temperatures is 25% higher than in bulk H{sub 2} crystals and have observed that the structure of those films is affected by annealing at 3.4 K. The author has measured the J = 1 to J = 0 conversion rate to be comparable to that of the bulk for thick films; however, he found evidence that the gold surface catalyzes conversion in the first two to four layers. He has also used this apparatus to study films of {sup 4}He less than one layer thick adsorbed on an evaporated gold surface. He shows that the phase diagram of the system is similar to that for {sup 4}He/graphite although not as rich in structure, and the phase boundaries occur at different coverages and temperatures. At coverages below about half a layer and at sufficiently high temperatures, the {sup 4}He behaves like a two-dimensional noninteracting Bose gas. At lower temperatures and higher coverages, liquidlike and solidlike behavior is observed. The Appendix shows measurements of the far-infrared absorptivity of the high-{Tc} superconductor La{sub 1.87}Sr{sub 0.13}CuO{sub 4}.

Birmingham, J.T. [Univ. of California, Berkeley, CA (United States). Dept. of Physics]|[Lawrence Berkeley National Lab., CA (United States). Materials Sciences Div.

1996-06-01T23:59:59.000Z

318

Initial acquisition performance of the multiple receive antenna assisted DS-UWB downlink using search space reduction and iterative code phase estimation  

Science Conference Proceedings (OSTI)

In this paper we propose and investigate an iterative code acquisition scheme assisted by both Search Space Reduction (SSR) and iterative Message Passing (MP), which was designed for the multiple receive antenna assisted Direct Sequence-Ultra WideBand ... Keywords: direct sequence-ultra wideBand (DS-UWB), initial acquisition, mean acquisition time (MAT), message passing (MP), search space reduction (SSR)

SeungHwan Won; Lajos Hanzo

2009-01-01T23:59:59.000Z

319

Diffusion and filtration properties of self-assembled gold nanocrystal membranes.  

Science Conference Proceedings (OSTI)

Close-packed nanoparticle monolayers have recently been shown to form mechanically robust, free-standing membranes. We report the first measurements of molecular transport through such ultrathin sheets, self-assembled from dodecanethiol-ligated gold nanocrystals. For aqueous solutions we find filtration coefficients 2 orders of magnitude larger than those observed in polymer-based filters, sieving of large solutes, and for smaller solutes a pronounced dependence of rejection on being charged. These results open up new possibilities for controlled delivery and separation of nano-objects.

He, J.; Lin, X.-M.; Chan, H.; Vukovic, L.; Kral, P.; Jaeger, H. M. (Center for Nanoscale Materials); (Univ. of Chicago); (Univ. of Illinois at Chicago)

2011-06-01T23:59:59.000Z

320

Application of In-Situ High Energy-Resolution Fluorescence Detection and Time-Resolved X-Ray Spectroscopy: Catalytic Activation of Oxygen over Supported Gold Catalysts  

SciTech Connect

Life-time-broadening reduction in high-energy-resolution fluorescence detected XAS produced spectra of unprecedented detail. Au L3 edge spectra of a Au/Al2O3 catalyst under various reaction conditions showed the interaction of oxygen with the gold particles on this catalyst. A reaction path on the gold particle in the oxidation of CO was established.

Bokhoven, Jeroen A. van [Institute for Chemical and Bioengineering, ETH Zurich (Switzerland); Tromp, Moniek [University of Southampton, School of Chemistry, Southampton (United Kingdom); Glatzel, Pieter; Safonova, Olga [European Synchrotron Radiation Facility, Grenoble (France)

2007-02-02T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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321

Influence of the Edge Plasma Profile and Parameters on the Coupling of an ICRH Antenna. Application to ITER  

Science Conference Proceedings (OSTI)

The coupling to the fast wave of an ICRH antenna is principally determined by its distance to an optimum plasma density correlated to the cutoff one and by the density gradient between this optimum density and the bulk plasma. This explains the differences in coupling for the various heating and current drive phasings as predicted for different plasma edge profiles considered for ITER. For a given electron density edge profile the ion mix, the steady magnetic field and the frequency have also a significant effect on the coupling performances. These quantities affect the coupling mainly by influencing the position of the optimum density in the profile. A marked perturbation of the coupling leading to a large edge power deposition can occur when the Alfven resonance lies in the edge profile. The results are applied to different ICRF scenarios considered for ITER at full and half toroidal field.

Messiaen, A.; Koch, R.; Weynants, R. [LPP-ERM/KMS, EURATOM-Belgian State Association, Trilateral Euregio Cluster, Brussels (Belgium)

2011-12-23T23:59:59.000Z

322

Biofabrication of discrete spherical gold nanoparticles using the metal-reducing bacterium, Shewanella oneidensis  

Science Conference Proceedings (OSTI)

Nanocrystallites have garnered substantial interest due to their varying applications including catalysis. Consequently important aspects related to control of shape/size and syntheses through economical and non-hazardous means are desirable. Highly efficient bioreduction based natural fabrication approaches that utilize microbes and or -plant extracts are poised to meet these needs. Here we show that the gamma- proteobacterium, Shewanella oneidensis MR-1, can reduce tetrachloro aurate (III) ions, producing discrete extracellular spherical gold nanocrystallites. The particles were homogeneous with multiple size distributions and produced under ambient conditions at high yield, 88% of theoretical maximum. Further characterization revealed that the particles consist of spheres in the size range of 2-50 nm, with an average of 12 5 nm. The nanoparticles were hydrophilic, biocompatible, and resisted aggregation even after several months. The particles are likely capped by a detachable protein/peptide coat. UV-vis and Fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive X-ray spectra and transmission electron microscopy measurements confirmed the formation as well the crystalline nature of the nanoparticles. The antibacterial activity of these gold nanoparticles was assessed using Gram-negative (E. coli and S. oneidensis) and Gram-positive (B. subtilis) bacteria. Toxicity assessments divulged that the particles were neither toxic nor inhibitory to any of these bacteria.

Suresh, Anil K [ORNL; Pelletier, Dale A [ORNL; Wang, Wei [ORNL; Broich, Michael L [ORNL; Moon, Ji Won [ORNL; Gu, Baohua [ORNL; Allison, David P [ORNL; Joy, David Charles [ORNL; Phelps, Tommy Joe [ORNL; Doktycz, Mitchel John [ORNL

2011-01-01T23:59:59.000Z

323

USING THE SULFUR POLYMER STABILIZATION SOLIDIFICATION PROCESS TO TREAT RESIDUAL MERCURY WASTES FROM GOLD MINING OPERATIONS.  

SciTech Connect

Large quantities of mercury are generated as a by-product during the processing of gold ore following mining operations. Newmont Mining Corporation (NMC), which operates some of the world's largest gold mines, sought a method to permanently ''retire'' its mercury by-products, thereby avoiding potential environmental liability. Sulfur Polymer Stabilization-Solidification (SPSS) is an innovative technology developed at Brookhaven National Laboratory (BNL) for treatment of mercury and mercury contaminated materials, such as soil, sludge and debris. BNL conducted a treatability study to determine the potential applicability of SPSS for treatment of Newmont mercury, and the treated product passed the U.S. Environmental Protection Agency (EPA) test for toxicity. The SPSS process has been shown to be effective on radioactive and nonradioactive mercury and mercury-contaminated materials with a pilot-scale batch system capable of producing 0.03 m{sup 3} (1 ft{sup 3}) per batch. Engineering scale-up issues are discussed and material property tests addressing these issues are described.

BOWERMAN,B.ADAMS,J.KALB,P.WAN,R.Y.LEVIER,M.

2003-02-24T23:59:59.000Z

324

Evidence for Biomagnification of Gold Nanoparticles within a Terrestrial Food Chain  

Science Conference Proceedings (OSTI)

Nanoparticles from the rapidly increasing number of consumer products that contain manufactured nanomaterials are being discharged into waste streams. Increasing evidence suggests that several classes of nanomaterials may accumulate in sludge derived from wastewater treatment and ultimately in soil following land application as biosolids. Little research has been conducted to evaluate the impact of nanoparticles on terrestrial ecosystems, despite the fact that land application of biosolids from wastewater treatment will be a major pathway for the introduction of manufactured nanomaterials to the environment. To begin addressing this knowledge gap, we used the model organisms Nicotiana tabacum L. cv Xanthi and Manduca sexta (tobacco hornworm) to investigate plant uptake and the potential for trophic transfer of 5, 10, and 15 nm diameter gold (Au) nanoparticles (NPs). Samples were analyzed using both bulk analysis by inductively coupled plasma mass spectrometry (ICP-MS) as well as spatially resolved methods such as laser ablation inductively coupled mass spectrometry (LA-ICP-MS) and X-ray fluorescence ({mu}XRF). Our results demonstrate trophic transfer and biomagnification of gold nanoparticles from a primary producer to a primary consumer by mean factors of 6.2, 11.6, and 9.6 for the 5, 10, and 15 nm treatments, respectively. This result has important implications for risks associated with nanotechnology, including the potential for human exposure.

J Judy; J Unrine; P Bertsch

2011-12-31T23:59:59.000Z

325

The effect of flattening filter free delivery on endothelial dose enhancement with gold nanoparticles  

Science Conference Proceedings (OSTI)

Purpose: The aim of this study is to quantify and to compare the dose enhancement factor from gold nanoparticles (AuNP) to tumor endothelial cells for different concentrations of AuNP, and clinical MV beam configurations. Methods: Tumor endothelial cells are modeled as slabs measuring 10 Multiplication-Sign 10 Multiplication-Sign 2 {mu}m. A spherical AuNP is simulated on the surface of the endothelial cell, within the blood vessel. 6 MV photon beams with and without the flattening filter are investigated for different field sizes, depths in material and beam modulation. The incident photon energy spectra for each configuration is generated using EGSnrc. The dose enhancement in the tumor endothelial cell is found using an analytical calculation. The endothelial dose enhancement factor is defined to be the ratio of the dose deposited with and without AuNPs. Results: It is found that clinical beam parameters may be chosen to maximize the effect of gold nanoparticles during radiotherapy. This effect is further amplified {approx}20% by the removal of the flattening filter. Modulation of the clinical beam with the multileaf collimator tends to decrease the proportion of low energy photons, therefore providing less enhancement than the corresponding open field. Conclusions: The results of this work predict a dose enhancement to tumor blood vessel endothelial cells using conventional therapeutic (MV) x-rays and quantify the relative change in enhancement with treatment depth and field size.

Detappe, Alexandre [Dana-Farber Cancer Institute, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115 and Medical Physics Department, Joseph Fourier University, Grenoble 38000 (France); Tsiamas, Panagiotis [Dana-Farber Cancer Institute, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115 and Medical Physics Department, Medical School, University of Thessaly, Larisa 41100 (Greece); Ngwa, Wilfred; Zygmanski, Piotr; Makrigiorgos, Mike; Berbeco, Ross [Dana-Farber Cancer Institute, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115 (United States)

2013-03-15T23:59:59.000Z

326

Study of dithiol monolayer as the interface for controlled deposition of gold nanoparticles  

Science Conference Proceedings (OSTI)

Self-assembled monolayer of dithiol molecules, deposited on polycrystalline Au (111), prepared at room atmosphere, was studied using scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). Dithiols were used as interface, which chemically bonds to the deposited gold nanoparticles through strong covalent bonds. The size and size distribution of the deposited nanoparticles were measured using dynamic light scattering (DLS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The AFM results showed that nanoparticles are immobilized and stable during scanning procedure and do not contaminate the AFM tip. The size of monodisperse nanoparticles obtained from the DLS measurements is slightly higher than that obtained from the AFM and SEM measurements. This is due to the fact that the DLS measures the hydrodynamic radius, dependent on the protective chemical layer on nanoparticles. - Research Highlights: {yields} Dithiols molecules create chemically bounded layers on a Au (111) surface. {yields} Gold nanoparticles can be chemically bounded to a self-assembled monolayer. {yields} Nanoparticles are stable during AFM probe interactions.

Cichomski, M., E-mail: mcichom@uni.lodz.pl [Department of Materials Technology and Chemistry, University of Lodz, Pomorska 163, 90-236 Lodz (Poland); Tomaszewska, E.; Kosla, K. [Department of Materials Technology and Chemistry, University of Lodz, Pomorska 163, 90-236 Lodz (Poland); Kozlowski, W. [Department of Solid State Physics, University of Lodz, Pomorska 149/153, 90-236 Lodz (Poland); Kowalczyk, P.J. [Department of Solid State Physics, University of Lodz, Pomorska 149/153, 90-236 Lodz (Poland); MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8140 (New Zealand); Grobelny, J. [Department of Materials Technology and Chemistry, University of Lodz, Pomorska 163, 90-236 Lodz (Poland)

2011-03-15T23:59:59.000Z

327

ACID EVAPORATION OF ULTIMA GOLD TM AB LIQUID SCINTILLATION COCKTAIL RESIDUE  

SciTech Connect

Prior analyses of samples from the F/H Lab solutions showed the presence of diisopropylnapthalene (DIN), a major component of Ultima Gold{trademark} AB liquid scintillation cocktail (LSC). These solutions are processed through H-Canyon Tank 10.5 and ultimately through the 17.8E evaporator. Similar solutions originated in SRNL streams sent to the same H Canyon tanks. This study examined whether the presence of these organics poses a process-significant hazard for the evaporator. Evaporation and calorimetry testing of surrogate samples containing 2000 ppm of Ultima Gold{trademark} AB LSC in 8 M nitric acid have been completed. These experiments showed that although reactions between nitric acid and the organic components do occur, they do not appear to pose a significant hazard for runaway reactions or generation of energetic compounds in canyon evaporators. The amount of off-gas generated was relatively modest and appeared to be well within the venting capacity of the H-Canyon evaporators. A significant fraction of the organic components likely survives the evaporation process primarily as non-volatile components that are not expected to represent any new process concerns during downstream operations such as neutralization. Laboratory Waste solutions containing minor amounts of DIN can be safely received, stored, transferred, and processed through the canyon waste evaporator.

Kyser, E.; Fondeur, F.; Crump, S.

2011-12-21T23:59:59.000Z

328

What Protects the Core When the Thiolated Gold Cluster is Extremely Small?  

SciTech Connect

The title question is motivated by the fact that extremely small thiolated-gold clusters such as Au{sub 20}(SR){sub 16} have been isolated, but their undetermined structures cannot be fully rationalized by the present knowledge derived from single-crystal structures of larger clusters. One needs to go beyond the linear monomer (RSAuSR) and V-shaped dimer (RSAuSRAuSR) motifs that were found to protect larger clusters. We hypothesize that the U-shaped trimer motif (RSAuSRAuSRAuSR) is required to protect the core of some extremely small thiolated-gold clusters, which have about 20 or fewer Au atoms. We test this hypothesis by proposing structural models for Au{sub 10}(SR){sub 8} based on two trimer motifs protecting a tetrahedral Au{sub 4} core and for Au{sub 20}(SR){sub 16} based on four trimer motifs protecting an Au{sub 8} core.

Jiang, Deen [ORNL; Chen, Wei [University of Puerto Rico; Whetten, Robert L [Georgia Institute of Technology; Chen, Zhongfang [University of Georgia, Athens, GA

2009-01-01T23:59:59.000Z

329

The A.J. Goddard: Reconstruction and Material Culture of a Klondike Gold Rush Sternwheeler  

E-Print Network (OSTI)

The A.J. Goddard, a steamboat built for the Klondike Gold Rush of 1897-1898, wrecked in 1901 on Lake Laberge, Yukon Territory, where it lay undisturbed until its rediscovery in 2008 by the Yukon River Survey Project, directed by John Pollack. The complete and undisturbed nature of the wreck site, which is the only known site from this period to show such remarkable preservation, provides an unparalleled opportunity for studying the construction features of one of the Klondike steamboats and its associated material culture. The wreck of the A.J. Goddard is the only known surviving example of a small, prefabricated sternwheeler from the Yukon River's sternwheeler days. Due to the nature of its construction and building material, the A.J. Goddard represents a period of vast change in shipbuilding techniques, and is part of the fascinating juxtaposition between traditional wooden boats and a new, prefabricated industrial solution to boatbuilding. Work thus far has revealed that the A.J. Goddard possessed a simple design and construction, likely not one developed specifically for the Yukon River. It appears that the need to carry it over a mountain influenced its design more than the qualities of the Yukon River. Modifications were made over the course of its short career to make it more suitable, but its tragic end indicates that it was not a good choice for open-water navigation, though it admirably and successfully fulfilled its mission of serving throughout the gold rush. Though it was not ideally suited for the river and lakes environment where it was built, the quickness and ingenuity with which the vessel was constructed made it one of the few vessels, out of the thousands that set out for the Yukon in the summer of 1898, to actually make it to Dawson in time for the gold rush without being delayed by ice in the north, as so many were. Field seasons were conducted in 2009 and 2010 that focused on recording the boat's construction features and artifacts. Select artifacts were recovered for study and display in Whitehorse, Yukon Territory with the intention of creating an exhibit for the Yukon public.

Thomas, Lindsey Hall

2011-08-01T23:59:59.000Z

330

Arsenic microdistribution and speciation in toenail clippings of children living in a historic gold mining area  

SciTech Connect

Arsenic is naturally associated with gold mineralization and elevated in some soils and mine waste around historical gold mining activity in Victoria, Australia. To explore uptake, arsenic concentrations in children's toenail clippings and household soils were measured, and the microdistribution and speciation of arsenic in situ in toenail clipping thin sections investigated using synchrotron-based X-ray microprobe techniques. The ability to differentiate exogenous arsenic was explored by investigating surface contamination on cleaned clippings using depth profiling, and direct diffusion of arsenic into incubated clippings. Total arsenic concentrations ranged from 0.15 to 2.1 {micro}g/g (n = 29) in clipping samples and from 3.3 to 130 {micro}g/g (n = 22) in household soils, with significant correlation between transformed arsenic concentrations (Pearson's r = 0.42, P = 0.023) when household soil was treated as independent. In clipping thin sections (n = 2), X-ray fluorescence (XRF) mapping showed discrete layering of arsenic consistent with nail structure, and irregular arsenic incorporation along the nail growth axis. Arsenic concentrations were heterogeneous at 10 x 10 {micro}m microprobe spot locations investigated (< 0.1 to 13.3 {micro}g/g). X-ray absorption near-edge structure (XANES) spectra suggested the presence of two distinct arsenic species: a lower oxidation state species, possibly with mixed sulphur and methyl coordination (denoted As{sub (-S, -ch3)}{sup {approx}III}); and a higher oxidation state species (denoted As{sub (-O)}{sup {approx}V}). Depth profiling suggested that surface contamination was unlikely (n = 4), and XRF and XANES analyses of thin sections of clippings incubated in dry or wet mine waste, or untreated, suggested direct diffusion of arsenic occurred under moist conditions. These findings suggest that arsenic in soil contributes to some systemic absorption associated with periodic exposures among children resident in areas of historic gold mining activity in Victoria, Australia. Future studies are required to ascertain if adverse health effects are associated with current levels of arsenic uptake.

Pearce, Dora C.; Dowling, Kim; Gerson, Andrea R.; Sim, Malcolm R.; Sutton, Stephen R.; Newville, Matthew; Russell, Robert; McOrist, Gordon (U. South Australia); (Ballarat); (Monash); (UC); (ANSTO)

2010-05-04T23:59:59.000Z

331

Nonlocal, grating-coupled scattering-type near-field scanning optical microscopy of individual gold nano-particles  

E-Print Network (OSTI)

nano-particles D. Sadiq, J. Shirdel*, and C. Lienau Institut für Physik, Carl von Ossietzky Universität nano-particles. We demonstrate sub-30-nm-resolution imaging of localized SPP fields. By comparison onto a photodetector. When imaging small individual gold nano-particles with

Park, Namkyoo

332

Integration of organic insulator and self-assembled gold nanoparticles on Si MOSFET for novel non-volatile memory cells  

Science Conference Proceedings (OSTI)

We have fabricated a hybrid non-volatile gold nanoparticle floating-gate memory metal insulator semiconductor field effect transistor (MISFET) device combining silicon technology and organic thin film deposition. The nanoparticles are deposited by chemical ... Keywords: hybrid Silicon-organic memory, nanocrystal memory, nanoparticles, non-volatile memory

S. Kolliopoulou; P. Dimitrakis; P. Normand; H.-L. Zhang; N. Cant; S. D. Evans; S. Paul; C. Pearson; A. Molloy; M. C. Petty; D. Tsoukalas

2004-06-01T23:59:59.000Z

333

Gold Nanoparticles Supported on Carbon Nitride: Influence of Surface Hydroxyls on Low Temperature Carbon Monoxide Oxidation  

SciTech Connect

This paper reports the synthesis of 2.5 nm gold clusters on the oxygen free and chemically labile support carbon nitride (C3N4). Despite having small particle sizes and high enough water partial pressure these Au/C3N4 catalysts are inactive for the gas phase and liquid phase oxidation of carbon monoxide. The reason for the lack of activity is attributed to the lack of surface OH groups on the C3N4. These OH groups are argued to be responsible for the activation of CO in the oxidation of CO. The importance of basic OH groups explains the well document dependence of support isoelectric point versus catalytic activity.

Singh, Joseph A [ORNL; Dudney, Nancy J [ORNL; Li, Meijun [ORNL; Overbury, Steven {Steve} H [ORNL; Veith, Gabriel M [ORNL

2012-01-01T23:59:59.000Z

334

Influence of Polarization Setting on Gold Nanorod Signal at Nonplasmonic Wavelengths Under Differential Interference Contrast Microscopy  

SciTech Connect

Researchers rely on a variety of microscopic techniques for observing and tracking anisotropic nanoparticles in real time experiments. This technical note focuses on the optical behavior exhibited by gold nanorods at nonplasmonic wavelengths under differential interference contrast microscopy (DIC). Intense diffraction patterns appear at nonplasmonic wavelengths, and the behavior of these patterns can be altered by adjusting the surrounding medium or the polarizer setting. Such patterns are absent when linear and crossed polarizations are utilized. Making polarization adjustments is important in DIC microscopy, because it affects bias retardation and image contrast. The nonplasmonic diffraction bands that were observed could potentially be exploited for rotational tracking, but more importantly, researchers should exhibit care in selecting a nanorod sample and the polarization setting when working with DIC microscopy.

Stender, Anthony S.; Augspurgert, Ashley E.; Wang, Gufeng: Fang, Ning

2012-05-31T23:59:59.000Z

335

Weak dispersive forces between glass-gold macroscopic surfaces in alcohols  

E-Print Network (OSTI)

In this work we concentrate on an experimental validation of the Lifshitz theory for van der Waals and Casimir forces in gold-alcohol-glass systems. From this theory weak dispersive forces are predicted when the dielectric properties of the intervening medium become comparable to one of the interacting surfaces. Using inverse colloid probe atomic force microscopy dispersive forces were measured occasionally and under controlled conditions by addition of salt to screen the electrostatic double layer force if present. The dispersive force was found to be attractive, and an order of magnitude weaker than that in air. Although the theoretical description of the forces becomes less precise for these systems even with full knowledge of the dielectric properties, we find still our results in reasonable agreement with Lifshitz theory.

P. J. van Zwol; G. Palasantzas; J. Th. M. DeHosson

2009-04-03T23:59:59.000Z

336

ALD Functionalized Nanoporous Gold: Thermal Stability, Mechanical Properties, and Catalytic Activity  

DOE Green Energy (OSTI)

Nanoporous metals have many technologically promising applications but their tendency to coarsen limits their long-term stability and excludes high temperature applications. Here, we demonstrate that atomic layer deposition (ALD) can be used to stabilize and functionalize nanoporous metals. Specifically, we studied the effect of nanometer-thick alumina and titania ALD films on thermal stability, mechanical properties, and catalytic activity of nanoporous gold (np-Au). Our results demonstrate that even only one-nm-thick oxide films can stabilize the nanoscale morphology of np-Au up to 1000 C, while simultaneously making the material stronger and stiffer. The catalytic activity of np-Au can be drastically increased by TiO{sub 2} ALD coatings. Our results open the door to high temperature sensor, actuator, and catalysis applications and functionalized electrodes for energy storage and harvesting applications.

Biener, M M; Biener, J; Wichmann, A; Wittstock, A; Baumann, T F; Baeumer, M; Hamza, A V

2011-03-24T23:59:59.000Z

337

Continuous Commissioning of a LEED-EB Gold Certified Office Building  

E-Print Network (OSTI)

A 320,000 square foot Class A high-rise office building in Nashville, TN achieved LEED-EB Gold Certification. LEED-EB version 2.0 was utilized, which requires Retro-Commissioning (RCx) as a prerequisite for certification. SSRCx performed the RCx services during the LEED-EB performance period, and was contracted after building certification to utilize the Continuous Commissioning (CC) process to seek additional energy savings. The building was constructed in 1999 as a Core and Shell project and build-outs were done through 2001. By January 2008, a single company managed and occupied the facility. This paper describes the RCx process for LEED-EB v2.0 and the CC process after LEED Certification. Findings and implementation strategies for energy savings are presented for both processes.

McCown, P.

2009-11-01T23:59:59.000Z

338

Binary Heterogeneous Superlattices Assembled from Quantum Dots and Gold Nanoparticles with DNA  

SciTech Connect

Controllable assembly of three-dimensional (3D) superlattices composed of different types of nanoscale objects opens new opportunities for material fabrication. Herein we show the successful assembly of heterogeneous 3D structures from gold nanoparticles (AuNPs) and quantum dots (QDs) using DNA encoding. By applying synchrotron-based small-angle X-ray scattering, we found that AuNPs and QDs are positioned in a body-centered cubic lattice, while each particle type, AuNP and QD, is arranged in a simple-cubic manner. Our studies demonstrate a route for assembly of integrated heterogeneous 3D structures from different nano-objects by DNA-encoded interactions.

D Sun; O Gang

2011-12-31T23:59:59.000Z

339

Determination of electric field, magnetic field, and electric current distributions of infrared optical antennas: A nano-optical vector network analyzer  

E-Print Network (OSTI)

In addition to the electric field E(r), the associated magnetic field H(r) and current density J(r) characterize any electromagnetic device, providing insight into antenna coupling and mutual impedance. We demonstrate the optical analogue of the radio frequency vector network analyzer implemented in interferometric homodyne scattering-type scanning near-field optical microscopy (s-SNOM) for obtaining E(r), H(r), and J(r). The approach is generally applicable and demonstrated for the case of a linear coupled-dipole antenna in the mid-infrared. The determination of the underlying 3D vector electric near-field distribution E(r) with nanometer spatial resolution and full phase and amplitude information is enabled by the design of probe tips with selectivity with respect to E-parallel and E-perpendicular fabricated by focused ion-beam milling and nano-CVD.

Olmon, Robert L; Krenz, Peter M; Lail, Brian A; Saraf, Laxmikant V; Boreman, Glenn D; Raschke, Markus B

2010-01-01T23:59:59.000Z

340

Fast-wave Power Flow Along SOL Field Lines In NSTX nd The Associated Power Deposition Profile Across The SOL In Front Of The Antenna  

SciTech Connect

Fast-wave heating and current drive efficiencies can be reduced by a number of processes in the vicinity of the antenna and in the scrape off layer (SOL). On NSTX from around 25% to more than 60% of the high-harmonic fast-wave power can be lost to the SOL regions, and a large part of this lost power flows along SOL magnetic field lines and is deposited in bright spirals on the divertor floor and ceiling. We show that field-line mapping matches the location of heat deposition on the lower divertor, albeit with a portion of the heat outside of the predictions. The field-line mapping can then be used to partially reconstruct the profile of lost fast-wave power at the midplane in front of the antenna, and the losses peak close to the last closed flux surface (LCFS) as well as the antenna. This profile suggests a radial standing-wave pattern formed by fast-wave propagation in the SOL, and this hypothesis will be tested on NSTX-U. Advanced RF codes must reproduce these results so that such codes can be used to understand this edge loss and to minimize RF heat deposition and erosion in the divertor region on ITER.

Perkins, Roy

2013-06-21T23:59:59.000Z

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341

DOE/EIS-0285/SA-134: Supplement Analysis for the Transmission System Vegetation Management Program FEIS (Bandon-Rogue-GoldBeach)(3/24/03)  

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

4, 2003 4, 2003 REPLY TO ATTN OF: KEP/4 SUBJECT: Supplement Analysis for the Transmission System Vegetation Management Program FEIS (DOE/EIS-0285/SA-134-Bandon-Rogue-GoldBeach) Ben Tilley Natural Resource Specialist - TFE/Alvey Proposed Action: Vegetation Management for the Bandon-Rogue-Gold Beach transmission line corridor. This corridor includes the Bandon-Rogue #1 115 kV transmission line from Bandon Substation to Rogue Substation and the Rogue-Gold Beach #1 and #2 115kV transmission lines, starting at Rogue Substation and ending at Gold Beach Substation. In addition the project includes adjacent portions of the Fairview-Rogue #1 230 kV Transmission Line. Location: The project is located in the BPA Eugene Region, Coos and Curry Counties, Oregon.

342

Preliminary report on the implications of mining practices in an open-pit gold mine for monitoring of a comprehensive Test Ban Treaty  

SciTech Connect

This report summarizes the preliminary results of an ongoing experiment at the Gold Quarry pit, operated by the Newmont Gold Company at Carlin, NV. The purpose of the experiment is to obtain local and regional seismic data together with ``ground truth``, from conventional surface blasting activity and to use these data to help determine the effectiveness with which conventional mining blasts can be discriminated from underground nuclear explosions.

Jarpe, S.P.; Goldstein, P.; Moran, B.; Glenn, L.A.

1995-07-01T23:59:59.000Z

343

Dynamic investigation of gold nanocrystal assembly using in situ grazing-incidence small angle x-ray scattering.  

SciTech Connect

Here we investigate the dynamic self-assembly pathway of ordered gold nanocrystal arrays during the self-assembly of gold nanocrystal micelles, with and without the presence of colloidal silica precursors, using grazing-incidence X-ray scattering performed at a synchrotron source. With silica precursors present, a lattice with rhombohedral symmetry is formed from the partial collapse of a face-centered cubic structure. In the absence of silica, a transient body-centered orthorhombic phase appears, which rapidly collapses into a glassy nanocrystal film. The appearance of face-centered and body-centered structures is consistent with a phase diagram for charged colloidal particles with assembly modulated via Coulomb screening.

Dunphy, D.; Fan, H.; Li, X.; Wang, J.; Brinker, C. J.; X-Ray Science Division; Univ. of New Mexico; SNL

2008-01-01T23:59:59.000Z

344

Coverage Dependent Charge Reduction of Cationic Gold Clusters on Surfaces Prepared Using Soft Landing of Mass-selected Ions  

Science Conference Proceedings (OSTI)

The ionic charge state of monodisperse cationic gold clusters on surfaces may be controlled by selecting the coverage of mass-selected ions soft landed onto a substrate. Polydisperse diphosphine-capped gold clusters were synthesized in solution by reduction of chloro(triphenylphosphine)gold(I) with borane tert-butylamine in the presence of 1,3-bis(diphenylphosphino)propane. The polydisperse gold clusters were introduced into the gas phase by electrospray ionization and mass selection was employed to select a multiply charged cationic cluster species (Au11L53+, m/z = 1409, L = 1,3-bis(diphenylphosphino)propane) which was delivered to the surfaces of four different self-assembled monolayers on gold (SAMs) at coverages of 1011 and 1012 clusters/mm2. Employing the spatial profiling capabilities of in-situ time-of-flight secondary ion mass spectrometry (TOF-SIMS) it is shown that, in addition to the chemical functionality of the monolayer (as demonstrated previously: ACS Nano, 2012, 6, 573) the coverage of cationic gold clusters on the surface may be used to control the distribution of ionic charge states of the soft-landed multiply charged clusters. In the case of a 1H,1H,2H,2H-perfluorodecanethiol SAM (FSAM) almost complete retention of charge by the deposited Au11L53+ clusters was observed at a lower coverage of 1011 clusters/mm2. In contrast, at a higher coverage of 1012 clusters/mm2, pronounced reduction of charge to Au11L52+ and Au11L5+ was observed on the FSAM. When soft landed onto 16- and 11-mercaptohexadecanoic acid surfaces on gold (16,11-COOH-SAMs), the mass-selected Au11L53+ clusters exhibited partial reduction of charge to Au11L52+ at lower coverage and additional reduction of charge to both Au11L52+ and Au11L5+ at higher coverage. The reduction of charge was found to be more pronounced on the surface of the shorter (thinner) C11 than the longer (thicker) C16-COOH-SAM. On the surface of the 1-dodecanethiol (HSAM) monolayer, the most abundant charge state was found to be Au11L52+ at lower coverage and Au11L5+ at higher coverage, respectively. A coverage-dependent electron tunneling mechanism is proposed to account for the observed reduction of charge of mass-selected multiply charged gold clusters soft landed on SAMs. The results demonstrate that one of the critical parameters that influence the chemical and physical properties of supported metal clusters, ionic charge state, may be controlled by selecting the coverage of charged species soft landed onto surfaces.

Johnson, Grant E.; Priest, Thomas A.; Laskin, Julia

2012-11-29T23:59:59.000Z

345

Electrocatalysts having platium monolayers on palladium, palladium alloy, and gold alloy core-shell nanoparticles, and uses thereof  

DOE Patents (OSTI)

The invention relates to platinum-coated particles useful as fuel cell electrocatalysts. The particles are composed of a noble metal or metal alloy core at least partially encapsulated by an atomically thin surface layer of platinum atoms. The invention particularly relates to such particles having a palladium, palladium alloy, gold alloy, or rhenium alloy core encapsulated by an atomic monolayer of platinum. In other embodiments, the invention relates to fuel cells containing these electrocatalysts and methods for generating electrical energy therefrom.

Adzic, Radoslav (Setauket, NY); Mo, Yibo (Naperville, IL); Vukmirovic, Miomir (Port Jefferson Station, NY); Zhang, Junliang (Rochester, NY)

2010-12-21T23:59:59.000Z

346

Gold nanoparticle-catalyzed reduction in a model system: Quantitative determination of reactive heterogeneity of a supported nanoparticle surface  

Science Conference Proceedings (OSTI)

Kinetic poisoning experiments employing organic ligands were conducted using a gold nanoparticlecatalyzed reaction consisting of the reduction of resazurin to resorufin. The kinetic contributions of three distinct types of sites along with the number density of each of these site types during reaction were determined. The calculated number densities of each of the three types of sites, hypothesized to be corners, edges, and terraces, correlates well with atomic-resolution micrographs of the supported gold nanoparticles, obtained using aberration-corrected transmission electron microscopy and with predictions based on geometric models of idealized gold nanoparticles. The most active sites comprising 1% of the surface atoms exhibit at least 30% of the total activity of the catalyst for resazurin reduction. The selective mechanical blocking of surface sites on nanoparticles, particularly undercoordinated sites, paves the way for novel approaches utilizing organic ligands to quantify the activity of different active sites and control catalysis on metal surfaces. This work was supported in part by the Laboratory Directed Research and Development program at the Pacific Northwest National Laboratory (PNNL). The aberration-corrected electron microscopy was performed in the William R. Wiley Environmental Molecular Sciences Laboratory, a U.S. Department of Energy (DOE) national scientific user facility located at PNNL and funded by BER. PNNL is operated by Battelle for the U.S. DOE under contract DE-AC05-76RL01830.

Nigra, Michael M.; Arslan, Ilke; Katz, Alexander

2012-11-01T23:59:59.000Z

347

Lessons Learned from Continuous Commissioning of a LEED Gold Building in Texas  

E-Print Network (OSTI)

The subject building is a relatively new building with 120,000 square feet located in Texas and was the first LEED Gold building in the area. To earn the title of a green building, the designers of this high performance building included many conservation and energy related design features and construction practices. The energy related design features of the building include a roof mounted photovoltaic system, a green roof design, and connection to a district cooling system which utilizes thermal storage. Many of the operations and mechanical issues identified during the course of commissioning the subject building are items common to many commercial buildings, green or conventional. The potential cost savings from implementing the measures is 21% of the annual energy consumption with a simple payback of less than one year. The findings at the subject building suggest that: High performance buildings have many of the same problems as conventional buildings since none of the issues and opportunities identified would generally be considered unique to high performance buildings The potential for savings from commissioning the systems in high performance buildings is similar to that of conventional buildings and is as economically attractive.

Bynum, J.; Claridge, D. E.

2008-09-22T23:59:59.000Z

348

Laser-assisted scanning probe alloying nanolithography (LASPAN) and its application in gold-silicon system  

E-Print Network (OSTI)

Nanoscale science and technology demand novel approaches and new knowledge to further advance. Nanoscale fabrication has been widely employed in both modern science and engineering. Micro/nano lithography is the most common technique to deposit nanostructures. Fundamental research is also being conducted to investigate structural, physical and chemical properties of the nanostructures. This research contributes fundamental understanding in surface science through development of a new methodology. Doing so, experimental approaches combined with energy analysis were carried out. A delicate hardware system was designed and constructed to realize the nanometer scale lithography. We developed a complete process, namely laser-assisted scanning probe alloying nanolithography (LASPAN), to fabricate well-defined nanostructures in gold-silicon (Au-Si) system. As a result, four aspects of nanostructures were made through different experimental trials. A non-equilibrium phase (AuSi3) was discovered, along with a non-equilibrium phase diagram. Energy dissipation and mechanism of nanocrystalization in the process have been extensively discussed. The mechanical energy input and laser radiation induced thermal energy input were estimated. An energy model was derived to represent the whole process of LASPAN.

Peng, Luohan

2008-08-01T23:59:59.000Z

349

Measurements of Aerosol Charge and Size Distribution for Graphite, Gold, Palladium, and Silver Nanoparticles  

Science Conference Proceedings (OSTI)

The role of charge on aerosol evolution and hence the nuclear source term has been an issue of interest, and there is a need for both experimental techniques and modeling for quantifying this role. Our focus here is on further exploration of a tandem differential mobility analyzer (TDMA) technique to simultaneously measure both the size and charge (positive, negative and neutral) dependent aerosol distributions. We have generated graphite, gold, silver, and palladium nanoparticles (aerosol) using a spark generator. We measure the electrical mobility-size distributions for these aerosols using a TDMA, and from these data we deduce the full charge-size distributions. We observe asymmetry in the particle size distributions for negative and positive charges. This asymmetry could have a bearing on the dynamics of charged aerosols, indicating that the assumption of symmetry for size distributions of negatively and positively charged particles in source term simulations may not be always appropriate. Also, the experimental technique should find applications in measurements of aerosol rate processes that are affected by both particle charge and size (e.g. coagulation, deposition, resuspension), and hence in modeling and simulation of the nuclear source term.

Simones, Matthew P.; Gutti, Veera R.; Meyer, Ryan M.; Loyalka, Sudarshan K.

2011-11-01T23:59:59.000Z

350

Results of deep exploratory drilling between long and Newark Valleys, White Pine County, Nevada - implications for oil migration in the nearby Yankee gold mine paleohydrothermal system  

Science Conference Proceedings (OSTI)

In mid-1992, a consortium headed by Pioneer Oil and Gas (Midvale, Utah) drilled a deep (6700 ft) exploratory well in the southern Ruby Mountains-Buck Mountain are near the Alligator Ridge mining district in White Pine County, Nevada. The test well is located 1.5 mi southwest of USMX, Inc.'s, Yankee gold mine, an open-pit operation centered on a Carlin-type, sediment-hosted gold orebody noteworthy for containing abundant, fracture-controlled live oil. The Pioneer well as dry, but intersected much of the same stratigraphic section hosting gold at Yankee, thereby providing valuable clues to mechanisms of oil migration at this unusual, oil-bearing precious-metal deposit. Most of the gold at Yankee is hosted by the Devonian Pilot Shale, with a basal argillaceous limestone containing the bulk of the deposit's live oil. The equivalent section in the Pioneer wildcat well is a silty calcareous dolomite. Whereas the basal Pilot limestone at Yankee is rich in thick, locally gold- and arsenic-anomalous calcite veins and modules hosting abundant oil-bearing fluid inclusion, the basal Pilot dolomite in the Pioneer well contains only a few thin calcite-pyrite veinlets devoid of fluid inclusions. Moreover, the Yankee calcite veins have the same light-stable-isotope signatures as hydrothermal carbonate veins near or elsewhere in the Alligator Ridge district. These relationships imply that oil at Yankee migrated in the same hydrothermal system responsible for gold mineralization. Such systems elsewhere in the eastern Basin and Range, given favorable source rocks, traps, seals, and migratory pathways, might well have formed not only gold deposits, but also rich, spatially coincident oil reservoirs.

Pinnell, M.L. (Pioneer Oil and Gas, Midvale, UT (United States)); Hulen, J.B. (Univ. of Utah Research Institute, Salt Lake City, UT (United States)); Cox, J.W. (USMX, Reno, NV (United States))

1993-08-01T23:59:59.000Z

351

Dose reduction in LDR brachytherapy by implanted prostate gold fiducial markers  

Science Conference Proceedings (OSTI)

Purpose: The dosimetric impact of gold fiducial markers (FM) implanted prior to external beam radiotherapy of prostate cancer on low dose rate (LDR) brachytherapy seed implants performed in the context of combined therapy was investigated. Methods: A virtual water phantom was designed containing a single FM. Single and multi source scenarios were investigated by performing Monte Carlo dose calculations, along with the influence of varying orientation and distance of the FM with respect to the sources. Three prostate cancer patients treated with LDR brachytherapy for a recurrence following external beam radiotherapy with implanted FM were studied as surrogate cases to combined therapy. FM and brachytherapy seeds were identified on post implant CT scans and Monte Carlo dose calculations were performed with and without FM. The dosimetric impact of the FM was evaluated by quantifying the amplitude of dose shadows and the volume of cold spots. D{sub 90} was reported based on the post implant CT prostate contour. Results: Large shadows are observed in the single source-FM scenarios. As expected from geometric considerations, the shadows are dependent on source-FM distance and orientation. Large dose reductions are observed at the distal side of FM, while at the proximal side a dose enhancement is observed. In multisource scenarios, the importance of shadows appears mitigated, although FM at the periphery of the seed distribution caused underdosage (dose). In clinical cases, the FM reduced the dose to some voxels by up to 50% and generated shadows with extents of the order of 4 mm. Within the prostate contour, cold spots (dose) of the order of 20 mm{sup 3} were observed. D{sub 90} proved insensitive to the presence of FM for the cases selected. Conclusions: There is a major local impact of FM present in LDR brachytherapy seed implant dose distributions. Therefore, reduced tumor control could be expected from FM implanted in tumors, although our results are too limited to draw conclusions regarding clinical significance.

Landry, Guillaume; Reniers, Brigitte; Lutgens, Ludy; Murrer, Lars; Afsharpour, Hossein; Haas-Kock, Danielle de; Visser, Peter; Gils, Francis van; Verhaegen, Frank [Department of Radiation Oncology (MAASTRO), GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht (Netherlands); Departement de Physique, de Genie Physique et d'Optique, Universite Laval, Quebec (Canada) and Departement de Radio-Oncologie et Centre de Recherche en Cancerologie, Universite Laval, CHUQ Pavillon L'Hotel-Dieu de Quebec, Quebec (Canada); Department of Radiation Oncology (MAASTRO), GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht (Netherlands); Department of Radiation Oncology (MAASTRO), GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht (Netherlands) and Department of Oncology, McGill University, Montreal (Canada)

2012-03-15T23:59:59.000Z

352

Unusual mechanism for the short-range electron transfer within gold-alkanethiol-ionic-liquid films of subnanometer thickness  

SciTech Connect

Exploiting nanoscopically tunable composite gold-alkanethiol-ionic-liquid/ferrocene self-assembled systems with tunable electron transfer distance, we discovered in the case of thinner alkanethiol films a thermally activated electron transfer pattern totally controlled by the viscosity-related slow relaxation mode(s) of the ionic liquid acting as the reactant's fluctuating environment. This pattern manifested through the activation enthalpy and volume parameters that are identical to those for viscous flow was explained in terms of the extreme adiabatic mechanism with a vanishing Marcus barrier (via the exponential Franck-Condon-like term approaching unity).

Khoshtariya, Dimitri E. [Department of Physics and Institute for Biophysics and Bionanosciences, I. Javakhishvili Tbilisi State University, I. Chavchavadze Avenue 3, 0128 Tbilisi, Georgia (United States); Department of Chemistry and Pharmacy, University of Erlangen-Nuernberg, Egerlandstrasse 1, 91058 Erlangen (Germany); Institute of Molecular Biology and Biophysics and Institute of Inorganic Chemistry and Electrochemistry, Gotua 12, 0160 Tbilisi, Georgia (United States); Dolidze, Tina D. [Department of Chemistry and Pharmacy, University of Erlangen-Nuernberg, Egerlandstrasse 1, 91058 Erlangen (Germany); Institute of Molecular Biology and Biophysics and Institute of Inorganic Chemistry and Electrochemistry, Gotua 12, 0160 Tbilisi, Georgia (United States); Eldik, Rudi van [Department of Chemistry and Pharmacy, University of Erlangen-Nuernberg, Egerlandstrasse 1, 91058 Erlangen (Germany)

2009-12-15T23:59:59.000Z

353

Study of Inhibition, Reactivation and Aging Processes of Pesticides Using Graphene Nanosheets/Gold Nanoparticles-Based Acetylcholinesterase Biosensor  

SciTech Connect

Organophosphate (OP) and carbamate pesticides exert their toxicity via attacking the hydroxyl moiety of serine in the 'active site' of acetylcholinesterase (AChE). In this paper we developed a stable AChE biosensor based on self-assembling AChE to graphene nanosheet (GN)-gold nanoparticles (AuNPs) nanocomposite electrode for investigation of inhibition, reactivation and aging processes of different pesticides. It is confirmed that pesticides can inhibit AChE in a short time. OPs poisoning is treatable with oximes while carbarmates exposure is insensitive to oximes. The proposed electrochemical approach thus provides a new simple tool for comparison of pesticide sensitivity and guide of therapeutic intervention.

Zhang, Lin; Long, Linjuan; Zhang, Weiying; Du, Dan; Lin, Yuehe

2012-09-10T23:59:59.000Z

354

Increased superconducting transition temperature of a niobium thin-film proximity-coupled to gold nanoparticles using linking organic molecules  

E-Print Network (OSTI)

The superconducting critical temperature, TC, of thin Nb films is significantly modified when gold nanoparticles (NPs) are chemically linked to the Nb film, with a consistent enhancement when using 3 nm long disilane linker molecules. The TC increases by up to 10% for certain linker length and NPs size. No change is observed when the nanoparticles are physisorbed with non-linking molecules. Electron tunneling spectra acquired on the linked NPs below TC typically exhibit zero-bias peaks. We attribute these results to a pairing mechanism coupling electrons in the Nb and the NPs, mediated by the organic linkers.

Katzir, Eran; Zeides, Felix; Katz, Nadav; Kalcheim, Yoav; Millo, Oded; Leitus, Gregory; Myasodeyov, Yuri; Shapiro, Boris Ya; Naaman, Ron; Paltiel, Yossi

2011-01-01T23:59:59.000Z

355

Increased superconducting transition temperature of a niobium thin-film proximity-coupled to gold nanoparticles using linking organic molecules  

E-Print Network (OSTI)

The superconducting critical temperature, TC, of thin Nb films is significantly modified when gold nanoparticles (NPs) are chemically linked to the Nb film, with a consistent enhancement when using 3 nm long disilane linker molecules. The TC increases by up to 10% for certain linker length and NPs size. No change is observed when the nanoparticles are physisorbed with non-linking molecules. Electron tunneling spectra acquired on the linked NPs below TC typically exhibit zero-bias peaks. We attribute these results to a pairing mechanism coupling electrons in the Nb and the NPs, mediated by the organic linkers.

Eran Katzir; Shira Yochelis; Felix Zeides; Nadav Katz; Yoav Kalcheim; Oded Millo; Gregory Leitus; Yuri Myasodeyov; Boris Ya. Shapiro; Ron Naaman; Yossi Paltiel

2011-11-02T23:59:59.000Z

356

Antenna Metrology Project  

Science Conference Proceedings (OSTI)

... on satellites and spacecraft vital for communications, weather prediction, and space ... and related power sources, such as batteries and solar panels. ...

2010-10-05T23:59:59.000Z

357

Colloidal gold nanoparticle probe-based immunochromatographic assay for the rapid detection of chromium ions in water and serum samples  

SciTech Connect

An immunochromatographic assay (ICA) using gold nanoparticles coated with monoclonal antibody (McAb) for the detection of chromium ions (Cr) in water and serum samples was developed, optimized, and validated. Gold nanoparticles coated with affinity- purified monoclonal antibodies against isothiocyanobenzyl-EDTA (iEDTA)-chelated Cr3+ were used as the detecting reagent in this completive immunoassay-based one- step test strip. The ICA was investigated to measure chromium speciation in water samples. Chromium standard samples of 0-80 ng/mL in water were determined by the test strips. The results showed that the visual lowest detection limit (LDL) of the test strip was 50.0 ng/mL. A portable colorimetric lateral flow reader was used for the quantification of Cr. The results indicated that the linear range of the ICA with colorimetric detection was 5-80 ng/mL. The ICA was also validated for the detection of chromium ions in serum samples. The test trips showed high stability in that they could be stored at at 37 C for at least 12 weeks without significant loss of activity. The test strip also showed good selectivity for Cr detection with negligible interference from other heavy metals. Because of its low cost and short testing time (within 5 min), the test strip is especially suitable for on-site large- scale screening of Cr-polluted water samples, biomonitoring of Cr exposure, and many other field applications.

Liu, Xi; Xiang, Jun-Jian; Tang, Yong; Zhang, Xiao-Li; Fu, Qiang-Qiang; Zou, Jun-Hui; Lin, Yuehe

2012-09-01T23:59:59.000Z

358

Unmanned Aerial Vehicle (UAV) Dynamic-Tracking Directional Wireless Antennas for Low Powered Applications that Require Reliable Extended Range Operations in Time Critical Scenarios  

Science Conference Proceedings (OSTI)

The proven value of DOD Unmanned Aerial Vehicles (UAVs) will ultimately transition to National and Homeland Security missions that require real-time aerial surveillance, situation awareness, force protection, and sensor placement. Public services first responders who routinely risk personal safety to assess and report a situation for emergency actions will likely be the first to benefit from these new unmanned technologies. Packable or Portable small class UAVs will be particularly useful to the first responder. They require the least amount of training, no fixed infrastructure, and are capable of being launched and recovered from the point of emergency. All UAVs require wireless communication technologies for real- time applications. Typically on a small UAV, a low bandwidth telemetry link is required for command and control (C2), and systems health monitoring. If the UAV is equipped with a real-time Electro-Optical or Infrared (EO/Ir) video camera payload, a dedicated high bandwidth analog/digital link is usually required for reliable high-resolution imagery. In most cases, both the wireless telemetry and real-time video links will be integrated into the UAV with unity gain omni-directional antennas. With limited on-board power and payload capacity, a small UAV will be limited with the amount of radio-frequency (RF) energy it transmits to the users. Therefore, packable and portable UAVs will have limited useful operational ranges for first responders. This paper will discuss the limitations of small UAV wireless communications. The discussion will present an approach of utilizing a dynamic ground based real-time tracking high gain directional antenna to provide extend range stand-off operation, potential RF channel reuse, and assured telemetry and data communications from low-powered UAV deployed wireless assets.

Scott G. Bauer; Matthew O. Anderson; James R. Hanneman

2005-10-01T23:59:59.000Z

359

Cold Nuclear Matter Effects on J/Psi as Constrained by Deuteron-Gold Measurements at sqrt(s_NN) = 200 GeV  

E-Print Network (OSTI)

We present a new analysis of J/psi production yields in deuteron-gold collisions at sqrt(s_NN) = 200 GeV using data taken by the PHENIX experiment in 2003 and previously published in [S.S. Adler et al., Phys. Rev. Lett 96, 012304 (2006)]. The high statistics proton-proton J/psi data taken in 2005 is used to improve the baseline measurement and thus construct updated cold nuclear matter modification factors R_dAu. A suppression of J/psi in cold nuclear matter is observed as one goes forward in rapidity (in the deuteron-going direction), corresponding to a region more sensitive to initial state low-x gluons in the gold nucleus. The measured nuclear modification factors are compared to theoretical calculations of nuclear shadowing to which a J/psi (or precursor) break-up cross-section is added. Breakup cross sections of sigma_breakup = 2.8^[+1.7_-1.4] (2.2^[+1.6_-1.5]) mb are obtained by fitting these calculations to the data using two different models of nuclear shadowing. These breakup cross section values are consistent within large uncertainties with the 4.2 +/- 0.5 mb determined at lower collision energies. Projecting this range of cold nuclear matter effects to copper-copper and gold-gold collisions reveals that the current constraints are not sufficient to firmly quantify the additional hot nuclear matter effect.

PHENIX Collaboration; A. Adare

2007-11-25T23:59:59.000Z

360

The effects of 800 MeV proton irradiation on the corrosion of tungsten, tantalum, stainless steel, and gold  

Science Conference Proceedings (OSTI)

Real time electrochemical data were acquired for tungsten, tantalum, stainless steel 304L, and gold targets during proton irradiation at the LANSCE Weapons Neutron Research Facility. The goal of this research was to establish a better understanding of the corrosion properties of materials as a function of proton irradiation and gain insight into the mechanism of the observed phenomena. The following electrochemical observations were made during proton irradiation of W, Ta, SS304, and Au: (1) the open circuit potential of all materials increased with increasing proton fluence; (2) the corrosion rate (at the OCP) of W and SS304 increased with increasing proton fluence; (3) the passive dissolution rate for SS304 and Ta decreased with increasing proton fluence; (4) the anodic dissolution rate for W increased with increasing proton fluence; (5) the pitting potential for SS304 increased with proton fluence, which is an indication that the material is less susceptible to pitting attack during irradiation.

Lillard, R.S.; Butt, D.P.; Kanner, G.; Daemen, L.

1997-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" from the National Library of EnergyBeta (NLEBeta).
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361

Effects of interlayers on the scratch adhesion performance of ultra-thin films of copper and gold on silicon substrates  

SciTech Connect

Scratch testing has long been used to assess the adhesion of a film to its substrate. As film thicknesses have decreased, the need for greater precision and sensitivity in the scratch testing apparatus has increased. To this end, a nanoindenter was modified to make finely controlled, low-load scratches. Scratches at various loads and two orientations of a Berkovich scratching diamond were made in films of 100 nm of gold and 200 nm of copper, each on single crystal silicon. For each film type, samples with no interlayer, with an SiO{sub 2} interlayer, and with a TiW on SiO{sub 2} interlayer were tested. The scratch morphology was found to vary in a regular way with load, diamond orientation and interlayer material.

McAdams, S.D.; Tsui, T.Y.; Pharr, G.M. [Rice Univ., Houston, TX (United States); Oliver, W.C. [Nano Instruments, Inc., Knoxville, TN (United States)

1995-02-01T23:59:59.000Z

362

Operation Redwing-Project 6. 4. Airborne antennas and phototubes for determination of nuclear-weapon yield. Report for May-July 1956  

SciTech Connect

Airborne equipment was designed for determining the location and yield of a nuclear detonation. This equipment determines yield from a measurement of the interval between the time of the burst and the time of the second peak in the thermal-radiation intensity curve. Flush-mounted ferrite-core magnetic loop antennas for use in detecting the electromagnetic signal and thus fixing the time of the burst, performed successfully during Operation Redwing. Two kinds of photocubes for detecting the second thermal peak were tested and were found about equally satisfactory. The method selected for yield determination gave results accurate + or - 16% for five shots. Detailed study of the data showed that the electromagnetic signal, consisting of a direct pulse followed by a series of ionosphere-reflected sky waves, could be used in many waves to give information concerning the detonation and the ionsphere. From the time intervals between the ground wave and sky waves, it was foun possible to compute both the distance between and receiver and the height of the reflecting ionosphere layer.

Waters, A.J.; Clapp, R.E.

1985-04-01T23:59:59.000Z

363

An Assessment of Ore Waste and Dilution Resulting From Buffer/Choke Blasting in Surface Gold Mines  

SciTech Connect

A discrete element computer program named DMC{underscore}BLAST (Distinct Motion Code) has been under development since 1987 for modeling rock blasting (Preece {ampersand} Taylor, 1989). This program employs explicit time integration and uses spherical or cylindrical elements that are represented as circles in two dimensions (2-D). DMC{underscore}BLAST calculations compare favorably with data from actual bench blasts (Preece et al, 1993). Buffer Choke blasting is commonly used in surface gold mines to break the rock and dilate it sufficiently for ease of digging, with the assumption of insignificant horizontal movement. The blast designs usually call for relatively shallow holes benches ({lt} 11 m) with small blastholes (approx. 165 mm), small burdens and spacings ({lt}5 m), often with 50% or more of the hole stemmed. Control of blast-induced horizontal movement is desired because the ore is assayed in place from the blasthole drill cuttings and digging polygons of ore and waste are laid out before the blast. Horizontal movement at the ore waste boundary can result in dilution of the ore or loss of ore with the waste. The discrete element computer program DMC{underscore}BLAST has been employed to study spatial variation of horizontal rock motion during buffer choke blasting. Patterns of rock motion can be recognized from the discrete element simulations that would be difficult or impossible to recognize in the field (Preece, Tidman and Chung, 1997). Techniques have been developed to calculate ore waste and dilution from the horizontal movement predicted by DMC{underscore}BLAST. Four DMC{underscore}BLAST simulations of buffer blasting have been performed. The blasts are identical except that the burden and spacing are systematically varied which also changes the powder factor. Predictions of ore waste or dilution are made for each burden in the blast, assuming no horizontal movement, to illustrate the spatial variation observed.

Preece, D.S. [Sandia National Labs., Albuquerque, NM (United States); Chung, S.H.; Tidman, J.P. [ICI Explosives (Canada)

1997-12-31T23:59:59.000Z

364

Benchmark test of neutron transport calculations: Indium, nickel, gold, europium, and cobalt activation with and without energy moderated fission neutrons by iron simulating the Hiroshima atomic bomb casing  

Science Conference Proceedings (OSTI)

A benchmark test of the Monte Carlo neutron and photon transport code system (MCNP) was performed using a bare- and energy-moderated {sup 252}Cf fission neutron source which was obtained by transmission through 10-cm-thick iron. An iron plate was used to simulate the effect of the Hiroshima atomic bomb casing. This test includes the activation of indium and nickel for fast neutrons and gold, europium, and cobalt for thermal and epithermal neutrons, which were inserted in the moderators. The latter two activations are also to validate {sup 152}Eu and {sup 60}Co activity data obtained from the atomic bomb-exposed specimens collected at Hiroshima and Nagasaki, Japan. The neutron moderators used were Lucite and Nylon 6 and the total thickness of each moderator was 60 cm or 65 cm. Measured activity data (reaction yield) of the neutron-irradiated detectors in these moderators decreased to about 1/1,000th or 1/10,000th, which corresponds to about 1,500 m ground distance from the hypocenter in Hiroshima. For all of the indium, nickel, and gold activity data, the measured and calculated values agreed within 25%, and the corresponding values for europium and cobalt were within 40%. From this study, the MCNP code was found to be accurate enough for the bare- and energy-moderated {sup 252}Cf neutron activation calculations of these elements using moderators containing hydrogen, carbon, nitrogen, and oxygen. 18 refs., 10 figs., 4 tabs.

Iwatani, Kazuo; Shizuma, Kiyoshi; Hasai, Hiromi; Hoshi, Masaharu; Hiraoka, Masayuki; Hayakawa, Norihiko [Hiroshima Univ., Higashi-Hiroshima (Japan); Oka, Takamitsu [Kure Women`s College, Hiroshima-ken (Japan)

1994-10-01T23:59:59.000Z

365

Gold Standard Gravity ?  

E-Print Network (OSTI)

This paper provides striking confirmation of the restrictions of the structural gravity model of trade. Structural forces predicted by theory explain 95 % of the variation of the fixed effects used to control for them in the recent gravity literature, fixed effects that in principle could reflect other forces. This validation opens avenues to inferring unobserved sectoral activity and multilateral resistance variables by equating fixed effects with structural gravity counterparts. Our findings also provide important validation of a host of general equilibrium comparative static exercises based on the structural gravity model.

James E. Anderson; Yoto V. Yotov; Dave Donaldson; Keith Head; Michael Waugh; We Arthur Lewbel

2012-01-01T23:59:59.000Z

366

mining gold silver coal  

Science Conference Proceedings (OSTI)

... Description: Operational and safety information associated with nuclear power plants. ... sites give me information about public radio and TV stations? ...

2003-06-19T23:59:59.000Z

367

EPRI Gold Card Project  

Science Conference Proceedings (OSTI)

This report presents recommendations and best practices to mitigate or reduce circuit card failures in nuclear power plants. This guidance presents practices for all aspects of plant operations related to circuit cardsfrom procurement, handling, burn-in, storage, and in-service and operational controls to maintenance, troubleshooting, data capture related to card failures, refurbishment and repairs, reverse engineering, and training for repair personnel. Major bases for this document are the Institute of...

2011-12-21T23:59:59.000Z

368

A Gold Bubble?  

E-Print Network (OSTI)

Financial bubbles make good entertainment. One often reads speculation that a certain stock, commodity, or even housing is in the midst of a price bubble. For stocks, examples often come from initial public offerings (IPOs), the most recent being LinkedIn (see for example [3]), and a large collection of such occurred during the dot com mania around the turn of the century. Part of the problem in deciding whether an asset is experiencing a price bubble is that there is not a widespread understanding of what a bubble actually is, although there is plenty of expressed desire to detect one in real time. Indeed, the President of the Federal Reserve, Ben Bernanke, said during his confirmation hearings in 2009, It is extraordinarily difficult in real time to know if an asset price is appropriate or not[1] Commodities are also great examples of alleged price bubbles. A famous example was the oil price increases of 2007/2008. Nobel prize winning economist Paul Krugman wrote in the New York Times that oil prices were not a bubble, and two days later Ben Stein wrote in the same paper that they were. Without a quantitative procedure, experts often have different opinions about the existence of price bubbles. In this regard William Dudley, the President of the New York Federal Reserve, in an interview with Planet Money stated ...what I am proposing is that we try to identify bubbles in real time, try to develop tools to address those bubbles, try to use those tools when appropriate to limit the size of those bubbles and, therefore, try to limit the damage when those bubbles burst. [5

Robert A. Jarrow; Younes Kchia; Philip Protter

2011-01-01T23:59:59.000Z

369

Three Alkali-Metal-Gold-Gallium Systems. Ternary Tunnel Structures and Some Problems with Poorly Ordered Cations  

SciTech Connect

Six new intermetallic compounds have been characterized in the alkali metal (A = Na, Rb, Cs)goldgallium systems. Three isostructural compounds with the general composition A0.55Au2Ga2, two others of AAu3Ga2 (A = Rb, Cs), and the related Na13Au41.2Ga30.3 were synthesized via typical high-temperature reactions and their crystal structures determined by single-crystal X-ray diffraction analysis: Na0.56(9)Au2Ga2 (I, I4/mcm, a = 8.718(1) , c = 4.857(1) , Z = 4), Rb0.56(1)Au2Ga2 (II, I4/mcm, a = 8.950(1) , c = 4.829(1) , Z = 4), Cs0.54(2)Au2Ga2 (III, I4/mcm, a = 9.077(1) , c = 4.815(1) , Z = 4), RbAu3Ga2 (IV, Pnma, a = 13.384(3) , b = 5.577(1) , c = 7.017(1) , Z = 4), CsAu3Ga2 (V, Pnma, a = 13.511(3) , b = 5.614(2) , c = 7.146(1) , Z = 4), Na13Au41.2(1)Ga30.3(1) (VI, P6 mmm, a = 19.550(3) , c = 8.990(2) , Z = 2). The first three compounds (IIII) are isostructural with tetragonal K0.55Au2Ga2 and likewise contain planar eight-member Au/Ga rings that stack along c to generate tunnels and that contain varying degrees of disordered NaCs cations. The cation dispositions are much more clearly and reasonably defined by electron density mapping than through least-squares refinements with conventional anisotropic ellipsoids. Orthorhombic AAu3Ga2 (IV, V) are ordered ternary Rb and Cs derivatives of the SrZn5 type structure, demonstrating structural variability within the AAu3Ga2 family. All attempts to prepare an isotypic NaAu3Ga2 were not successful, but yielded only a similar composition Na13Au41.2Ga30.3 (NaAu3.17Ga2.33) (VI) in a very different structure with two types of cation sites. Crystal orbital Hamilton population (COHP) analysis obtained from tight-binding electronic structure calculations for idealized IIV via linear muffin-tin-orbital (LMTO) methods emphasized the major contributions of heteroatomic AuGa bonding to the structural stability of these compounds. The relative minima (pseudogaps) in the DOS curves for IV correspond well with the valence electron counts of known representatives of this structure type and, thereby, reveal some magic numbers to guide the search for new isotypic compounds. Theoretical calculation of total energies vs volumes obtained by VASP (Vienna Ab initio Simulation Package) calculations for KAu3Ga2 and RbAu3Ga2 suggest a possible transformation from SrZn5- to BaZn5-types at high pressure.

Smetana, Volodymyr; Miller, Gordon J.; Corbett, John D.

2012-06-27T23:59:59.000Z

370

Bulk gold catalyzed oxidation reactions of amines and isocyanides and iron porphyrin catalyzed N-H and O-H bond insertion/cyclization reactions of diamines and aminoalcohols  

Science Conference Proceedings (OSTI)

This work involves two projects. The first project entails the study of bulk gold as a catalyst in oxidation reactions of isocyanides and amines. The main goal of this project was to study the activation and reactions of molecules at metal surfaces in order to assess how organometallic principles for homogeneous processes apply to heterogeneous catalysis. Since previous work had used oxygen as an oxidant in bulk gold catalyzed reactions, the generality of gold catalysis with other oxidants was examined. Amine N-oxides were chosen for study, due to their properties and use in the oxidation of carbonyl ligands in organometallic complexes. When amine N-oxides were used as an oxidant in the reaction of isocyanides with amines, the system was able to produce ureas from a variety of isocyanides, amines, and amine N-oxides. In addition, the rate was found to generally increase as the amine N-oxide concentration increased, and decrease with increased concentrations of the amine. Mechanistic studies revealed that the reaction likely involves transfer of an oxygen atom from the amine N-oxide to the adsorbed isocyanide to generate an isocyanate intermediate. Subsequent nucleophilic attack by the amine yields the urea. This is in contrast to the bulk gold-catalyzed reaction mechanism of isocyanides with amines and oxygen. Formation of urea in this case was proposed to proceed through a diaminocarbene intermediate. Moreover, formation of the proposed isocyanate intermediate is consistent with the reactions of metal carbonyl ligands, which are isoelectronic to isocyanides. Nucleophilic attack at coordinated CO by amine N-oxides produces CO{sub 2} and is analogous to the production of an isocyanate in this gold system. When the bulk gold-catalyzed oxidative dehydrogenation of amines was examined with amine N-oxides, the same products were afforded as when O{sub 2} was used as the oxidant. When the two types of oxidants were directly compared using the same reaction system and conditions, it was found that the oxidative dehydrogenation of dibenzylamine to Nbenzylidenebenzylamine, with N-methylmorpholine N-oxide (NMMO), was nearly quantitative (96%) within 24 h. However, the reaction with oxygen was much slower, with only a 52% yield of imine product over the same time period. Moreover, the rate of reaction was found to be influenced by the nature of the amine N-oxide. For example, the use of the weakly basic pyridine N-oxide (PyNO) led to an imine yield of only 6% after 24 h. A comparison of amine N-oxide and O2 was also examined in the oxidation of PhCH{sub 2}OH to PhCHO catalyzed by bulk gold. In this reaction, a 52% yield of the aldehyde was achieved when NMMO was used, while only a 7% product yield was afforded when O{sub 2} was the oxidant after 48 h. The bulk gold-catalyzed oxidative dehydrogenation of cyclic amines generates amidines, which upon treatment with Aerosil and water were found to undergo hydrolysis to produce lactams. Moreover, 5-, 6-, and 7-membered lactams could be prepared through a one-pot reaction of cyclic amines by treatment with oxygen, water, bulk gold, and Aerosil. This method is much more atom economical than industrial processes, does not require corrosive acids, and does not generate undesired byproducts. Additionally, the gold and Aerosil catalysts can be readily separated from the reaction mixture. The second project involved studying iron(III) tetraphenylporphyrin chloride, Fe(TPP)Cl, as a homogeneous catalyst for the generation of carbenes from diazo reagents and their reaction with heteroatom compounds. Fe(TPP)Cl, efficiently catalyzed the insertion of carbenes derived from methyl 2-phenyldiazoacetates into O-H bonds of aliphatic and aromatic alcohols. Fe(TPP)Cl was also found to be an effective catalyst for tandem N-H and O-H insertion/cyclization reactions when 1,2-diamines and 1,2-alcoholamines were treated with diazo reagents. This approach provides a one-pot process for synthesizing piperazinones and morpholinones and related analogues such as quinoxalinones and benzoxazin-2-ones.

Klobukowski, Erik

2011-12-29T23:59:59.000Z

371

Scrap tires: Black gold or fool`s gold?  

Science Conference Proceedings (OSTI)

Three years ago, a US EPA report estimated there were between 2 and 3 billion tires stockpiled in the US. Currently, according to the Scrap Tire Management Council (STMC, Washington, DC), the number of stockpiled tires totals 850 million. However, this reduction is not due to federal or state legislation; simply, the number was overestimated. Whatever the actual number, scrap tire mounds have been large enough to prompt 34 states to developed scrap tire funding programs aimed at eliminating the stockpiling of the some 250 million tires generated per year, while gradually eliminating the tires already stockpiled. However, of the 34 states, only Illinois, Oregon, Florida, Wisconsin, and Minnesota, are aggressively tackling the problem. In each of these five cases, state officials claim, the only viable way to reduce large quantities of tires quickly is through energy reuse, and, like any other disposal method, it costs money. To compensate for the costs of elimination, states are developing funding for scrap tire reduction programs by placing fees on tire disposal, tire purchase, or vehicle title transfer and registration.

Glaz, S.

1995-10-01T23:59:59.000Z

372

Localized Dose Enhancement to Tumor Blood Vessel Endothelial Cells via Megavoltage X-rays and Targeted Gold Nanoparticles: New Potential for External Beam Radiotherapy  

Science Conference Proceedings (OSTI)

Purpose: Tumor endothelial cell damage during radiation therapy may contribute significantly to tumor eradication and treatment efficacy. Gold nanoparticles (AuNPs) delivered preferentially to the walls of tumor blood vessels produce low-energy, short-range photoelectrons during external beam radiotherapy, boosting dose to the tumor microvasculature. In this study dosimetry at the single-cell level is used to estimate the anticipated AuNP-mediated dose enhancement to tumor endothelial cells during 6-MV X-ray irradiation. Methods and Materials: Endothelial cells are modeled as thin slabs with 100-nm-diameter AuNPs attached within the blood vessel. The number of photoelectrons emitted per AuNP per gray of X-rays is computed at multiple points along the external beam central axis by use of a Monte Carlo-generated energy fluence spectrum. The energy deposited from AuNP emissions to the endothelium is calculated based on an analytic method incorporating the energy-loss formula of Cole. The endothelial dose enhancement factor (EDEF) is the ratio of the overall (externally plus internally generated) dose to endothelial cells in the presence of AuNPs to the dose without AuNPs (from the external beam only). Results: At 20-cm depth, the EDEF is 1.7 (70% dose increase) for an intravascular AuNP concentration of 30 mg/g. Most of this dose enhancement arises from the low-energy (approximately 100 keV) portion of the linear accelerator X-ray spectrum. Furthermore, for AuNP concentrations ranging from 7 to 140 mg/g, EDEF values of 1.2 to 4.4 (20-340% dose increase) are calculated. Conclusions: In contrast to calculations assuming that AuNPs distributed homogeneously throughout the target volume (macrodosimetry), our cellular microdosimetry calculations predict a major dose enhancement to tumor microvasculature from conventional linear accelerator X-rays. This effect may enable the delivery of ablative therapeutic doses to these sensitive microstructures while maintaining established dose constraints for the organs at risk.

Berbeco, Ross I., E-mail: rberbeco@partners.org [Department of Radiation Oncology, Brigham and Women's Hospital, Dana-Farber Cancer Institute and Harvard Medical School, Boston, MA (United States); Ngwa, Wilfred; Makrigiorgos, G. Mike [Department of Radiation Oncology, Brigham and Women's Hospital, Dana-Farber Cancer Institute and Harvard Medical School, Boston, MA (United States)

2011-09-01T23:59:59.000Z

373

Mercury Detection with Gold Nanoparticles  

E-Print Network (OSTI)

R. J. Warmack, Detection of mercury vapor using resonatingA surface acoustic wave mercury vapor sensor, Ieee Trans.N. E. Selin, Integrating mercury science and policy in the

Crosby, Jeffrey

2013-01-01T23:59:59.000Z

374

Fritz Morgan: LEDs into gold  

Science Conference Proceedings (OSTI)

Fritz Morgen researches and designs LED-based lighting systems for theatrical, architectural, retail, and other clients for Color Kinetics Inc. in Boston. He works with top theatrical designers and architects all over the world to create novel lighting ...

S. Cherry

2005-02-01T23:59:59.000Z

375

Acta Materialia Gold Medal Award  

Science Conference Proceedings (OSTI)

... Inc. in 1973 as an international award to recognize leadership in materials ... through TMS, please contact the TMS Professional Affairs Administrator at:.

376

Au-Nb (Gold - Niobium)  

Science Conference Proceedings (OSTI)

Au-Nb crystallographic data...Au-Nb crystallographic data Phase Composition, wt% Nb Pearson symbol Space group (Au) 0 to ~38 cF 4 Fm m Au 2 Nb 19.1 hP 3 P 6/ mmm Au 2 Nb 3 41 tI 10 I 4/ mmm AuNb 3 56 to 70 cP 8 Pm n (Nb) ~46 to 100 cI 2 Im m...

377

Radiation Effects in Nanoporous Gold  

Science Conference Proceedings (OSTI)

Foams with filament and porous sizes in the range of nanometers could be unusually resistant to radiation because radiation induced point defects cannot...

378

Resonant-cavity antenna for plasma heating  

DOE Patents (OSTI)

This invention relates generally to a method and apparatus for transferring energy to a plasma immersed in a magnetic field, and relates particularly to an apparatus for heating a plasma of low atomic number ions to high temperatures by transfer of energy to plasma resonances, particularly the fundamental and harmonics of the ion cyclotron frequency of the plasma ions. This invention transfers energy from an oscillating radio-frequency field to a plasma resonance of a plasma immersed in a magnetic field.

Perkins, F.W. Jr.; Chiu, S.C.; Parks, P.; Rawls, J.M.

1984-01-10T23:59:59.000Z

379

Resonant-cavity antenna for plasma heating  

SciTech Connect

Disclosed is a resonant coil cavity wave launcher for energizing a plasma immersed in a magnetic field. Energization includes launching fast Alfven waves to excite ion cyclotron frequency resonances in the plasma. The cavity includes inductive and capacitive reactive members spaced no further than one-quarter wavelength from a first wall confinement chamber of the plasma. The cavity wave launcher is energized by connection to a waveguide or transmission line carrying forward power from a remote radio frequency energy source.

Perkins, Jr., Francis W. (Princeton, NJ); Chiu, Shiu-Chu (San Diego, CA); Parks, Paul (San Diego, CA); Rawls, John M. (Del Mar, CA)

1987-01-01T23:59:59.000Z

380

MARVEL: multiple antenna based relative vehicle localizer  

Science Conference Proceedings (OSTI)

Access to relative location of nearby vehicles on the local roads or on the freeways is useful for providing critical alerts to the drivers, thereby enhancing their driving experience as well as reducing the chances of accidents. The problem of determining ... Keywords: location classification, smartphone, wireless ranging

Dong Li; Tarun Bansal; Zhixue Lu; Prasun Sinha

2012-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" 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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381

Random Antenna Arrays Boost Emergency Communications  

Science Conference Proceedings (OSTI)

... in the many emergency communications difficulties during the response to the ... More importantly, since disaster sites rarely allow for niceties of ...

2011-04-07T23:59:59.000Z

382

Antenna Optimization By Using Finite Element Programs  

Science Conference Proceedings (OSTI)

Ion Cyclotron Frequency Heating and Current Drive play an important role in fusion experiments. The recent availability of powerful commercial finite element programs for PCs

F. Braun; ICRF Group

2005-01-01T23:59:59.000Z

383

A Dendrimer-Based Electron Antenna  

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

J. K. Whitesell, and M. A. Fox J. Am. Chem. Soc. 124, 8285-8289 (2002) Find paper at ACS Publications Abstract: Paired electron transfers (ET) induced by the absorption of two...

384

Quartz Antenna with Hollow Conductor - Lawrence Berkeley ...  

E.O. Lawrence Berkeley National Laboratory. APPLICATION OF TECHNOLOGY: High current ion sources ; Ion implanters ; Lithography

385

Structure of the polar electrojet antenna  

E-Print Network (OSTI)

Field experiments were performed in Gakona, Alaska in August and November 2002. The ionospheric conductivity was periodically perturbed using amplitude-modulated radiation from the HAARP HF transmitter (1 MW power, 14 dB ...

Riddolls, Ryan James, 1974-

2003-01-01T23:59:59.000Z

386

Antennas and Metamaterials for Electromagnetic Energy Harvesting.  

E-Print Network (OSTI)

??The emergence of microwave energy harvesting systems, commonly referred to as rectenna or Wireless Power Transfer (WPT) systems, has enabled numerous applications in many areas (more)

Almoneef, Thamer

2012-01-01T23:59:59.000Z

387

Antenna-enhanced Optoelectronics of Carbon Nanotubes  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, Materials Science & Technology 2013. Symposium, Scanning Probe Techniques for Functional Materials. Presentation Title...

388

Carbon Nanotube and Thin Film RF Antenna  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, 2011 TMS Annual Meeting & Exhibition. Symposium , 2011 Functional and Structural Nanomaterials: Fabrication, Properties,...

389

Highly Directional Antenna for Improved Communications ...  

Solar Photovoltaic; Solar Thermal; Startup America; Vehicles and Fuels; Wind Energy; Partners (27) Visual Patent Search; Success Stories; ... and weat ...

390

Lessons Learned from the 200 West Pump and Treatment Facility Construction Project at the US DOE Hanford Site - A Leadership for Energy and Environmental Design (LEED) Gold-Certified Facility  

SciTech Connect

CH2M Hill Plateau Remediation Company (CHPRC) designed, constructed, commissioned, and began operation of the largest groundwater pump and treatment facility in the U.S. Department of Energys (DOE) nationwide complex. This one-of-a-kind groundwater pump and treatment facility, located at the Hanford Nuclear Reservation Site (Hanford Site) in Washington State, was built to an accelerated schedule with American Recovery and Reinvestment Act (ARRA) funds. There were many contractual, technical, configuration management, quality, safety, and Leadership in Energy and Environmental Design (LEED) challenges associated with the design, procurement, construction, and commissioning of this $95 million, 52,000 ft groundwater pump and treatment facility to meet DOEs mission objective of treating contaminated groundwater at the Hanford Site with a new facility by June 28, 2012. The project teams successful integration of the projects core values and green energy technology throughout design, procurement, construction, and start-up of this complex, first-of-its-kind Bio Process facility resulted in successful achievement of DOEs mission objective, as well as attainment of LEED GOLD certification, which makes this Bio Process facility the first non-administrative building in the DOE Office of Environmental Management complex to earn such an award.

Dorr, Kent A.; Ostrom, Michael J.; Freeman-Pollard, Jhivaun R.

2013-01-11T23:59:59.000Z

391

Lessons Learned From The 200 West Pump And Treatment Facility Construction Project At The US DOE Hanford Site - A Leadership For Energy And Environmental Design (LEED) Gold-Certified Facility  

SciTech Connect

CH2M Hill Plateau Remediation Company (CHPRC) designed, constructed, commissioned, and began operation of the largest groundwater pump and treatment facility in the U.S. Department of Energy's (DOE) nationwide complex. This one-of-a-kind groundwater pump and treatment facility, located at the Hanford Nuclear Reservation Site (Hanford Site) in Washington State, was built in an accelerated manner with American Recovery and Reinvestment Act (ARRA) funds and has attained Leadership in Energy and Environmental Design (LEED) GOLD certification, which makes it the first non-administrative building in the DOE Office of Environmental Management complex to earn such an award. There were many contractual, technical, configuration management, quality, safety, and LEED challenges associated with the design, procurement, construction, and commissioning of this $95 million, 52,000 ft groundwater pump and treatment facility. This paper will present the Project and LEED accomplishments, as well as Lessons Learned by CHPRC when additional ARRA funds were used to accelerate design, procurement, construction, and commissioning of the 200 West Groundwater Pump and Treatment (2W P&T) Facility to meet DOE's mission of treating contaminated groundwater at the Hanford Site with a new facility by June 28, 2012.

Dorr, Kent A. [CH2M HILL Plateau Remediation Company, Richland, WA (United States); Ostrom, Michael J. [CH2M HILL Plateau Remediation Company, Richland, WA (United States); Freeman-Pollard, Jhivaun R. [CH2M HILL Plateau Remediation Company, Richland, WA (United States)

2012-11-14T23:59:59.000Z

392

Mercury Sensing with Optically Responsive Gold Nanoparticles  

E-Print Network (OSTI)

We assume that the mass of mercury adsorbed at saturation istactics, nanoparticle based mercury sensing should advancemost sensitive method for mercury sensing. References "1!

James, Jay Zachary

2012-01-01T23:59:59.000Z

393

FISSION OF GOLD BY CARBON IONS  

E-Print Network (OSTI)

and J. R. Huizenga, Nuclear Fission (to be published inHeavy-lon-Induced Nuclear Fission, (to be published in Proc.

Gordon, Glen E.; Larsh, Almon E.; Sikkeland, Torbjorn; Seaborg, Glenn T.

2008-01-01T23:59:59.000Z

394

Mercury Sensing with Optically Responsive Gold Nanoparticles  

E-Print Network (OSTI)

coal-fire utility burners in the source category list, butomission of utility boilers from the source category list in

James, Jay Zachary

2012-01-01T23:59:59.000Z

395

Gold nanostructures and methods of use  

DOE Patents (OSTI)

The invention is drawn to novel nanostructures comprising hollow nanospheres and nanotubes for use as chemical sensors, conduits for fluids, and electronic conductors. The nanostructures can be used in microfluidic devices, for transporting fluids between devices and structures in analytical devices, for conducting electrical currents between devices and structure in analytical devices, and for conducting electrical currents between biological molecules and electronic devices, such as bio-microchips.

Zhang, Jin Z. (Santa Cruz, CA); Schwartzberg, Adam (Santa Cruz, CA); Olson, Tammy Y. (Santa Cruz, CA)

2012-03-20T23:59:59.000Z

396

Gold(I)-Catalyzed Nucleophilic Additions  

E-Print Network (OSTI)

enyloxycarbamate 3.36. The crude oil was purified by columnenyloxycarbamate 3.26. The crude oil was purified by columndienyloxycarbamate 3.38. The crude oil was purified by flash

LaLonde, Rebecca Lyn K. C.

2010-01-01T23:59:59.000Z

397

Fresh Air That's as Good as Gold  

Office of Science (SC) Website

for Teachers and Scientists Small Business Innovation Research and Small Business Technology Transfer Project Assessment Laboratories Ames Laboratory Argonne National...

398

Electrocatalyst Having Gold Monolayers on Platinum ...  

Platinum is the most efficient electrocatalyst for accelerating chemical reactions in fuel cells for electric vehicles. During stop-and-go driving, ...

399

GLOBAL EXPLOITATION OF HEAP LEACHABLE GOLD DEPOSITS ...  

Science Conference Proceedings (OSTI)

Session Chairpersons: Donald M. Hausen, Consultant, Salt Lake City, UT; Leonard Harris, Consultant and Former General Manager, Minera Yanacocha, Peru...

400

Going for the Gold in Materials Technology  

Science Conference Proceedings (OSTI)

Feb 14, 2010 ... The Alternative Energy. Resources for Metals and. Materials Production. Symposium is of utmost importance to highly trained engineers and...

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Virtual Hydropower Prospecting Searching for Hydropower Gold  

DOE Green Energy (OSTI)

The availability of geographic information system (GIS) tools and analytical modeling of natural streams has made it possible to perform virtual river inventories that were formerly done using topographic maps, stream flow estimates, and physical reconnaissance. The Idaho National Laboratory (INL) in collaboration with the U.S. Geological Survey (USGS) virtually assessed the gross power potential of all natural streams in the United States of America and identified feasible potential project sites and estimated their developable power potential. The results of this virtual prospecting have been incorporated into a GIS application called the Virtual Hydropower Prospector that is available for public use on the Internet.

Douglas G. Hall

2007-12-01T23:59:59.000Z

402

GLOBAL EXPLOITATION OF HEAP LEACHABLE GOLD DEPOSITS ...  

Science Conference Proceedings (OSTI)

OXYGEN DIFFUSION INTO WET ORE HEAPS IMPEDED BY WATER VAPOR UPFLOW: R.W. Bartlett, K.A. Prisbrey, Univ. of Idaho, College of Mines and Earth

403

GLOBAL EXPLOITATION OF HEAP LEACHABLE GOLD DEPOSITS ...  

Science Conference Proceedings (OSTI)

Mineable reserves are 15.2 million tonnes of ore grading 1.45 grams/tonne, ... sites where winter temperatures routinely reach -45(C for extended periods.

404

Functionalized gold surface-enhanced raman scattering ...  

... for rapid and ultra-sensitive detection and identification of perchlorate (ClO.sub.4.sup.-) and other anions such as technetium (TcO.sub.4.sup.-), ...

405

2011 Acta Materialia Gold Medal and Prize  

Science Conference Proceedings (OSTI)

May 20, 2010... said Narayan, the North Carolina State University John C.C. Fan Family Distinguished Chair Professor, Materials Science and Engineering.

406

Black gold: return of the king  

SciTech Connect

The coal industry has woken from its slumber and finds itself ill-prepared for the demands being made upon it. Exporters are proving slow to expand their capacities and overcome infrastructural bottlenecks. The financial crisis may cause a hiatus in demand growth, but it will also limit finance for investment. 3 figs.

O'Connell, J.

2008-12-15T23:59:59.000Z

407

GLOBAL EXPLOITATION OF HEAP LEACHABLE GOLD DEPOSITS ...  

Science Conference Proceedings (OSTI)

... special tools and procedures for burying drip emitter lines, and managing the heap ... There are areas, however, where cold weather or excessive precipitation ...

408

40 Surface Design Journal Mining for Gold  

E-Print Network (OSTI)

Mendoza, chair), Fall 2000 Sarah F. Fletcher, Department of History "Wool-Work and Women in Roman History1 MARTA VALENTIN VICENTE Curriculum Vitae 1/292011 History Department/Women, Gender and Sexuality.A. with honors in History, University of Barcelona, Spain, June 1989 M.A. in History, Johns Hopkins University

Peterson, Blake R.

409

Functionalized Gold Nanoparticles for Rapid, Ultra- sensitive ...  

A rapid, highly sensitive, inexpensive method to detect and identify specific hazardous environmental pollutants has been invented by ORNL ...

410

Graphene Encapsulated Gold Nanoparticles and Their Chemical ...  

Science Conference Proceedings (OSTI)

We have developed a robust batch-production method to synthesize graphene encapsulated AuNPs. Patterned AuNPs on a silicon substrate were utilized as...

411

Giving Gold Alloys Room to Breathe  

Science Conference Proceedings (OSTI)

Jun 12, 2013 ... For this study, they examined alloys of a noble metal and a non-noble metal and found that, once ... COMMUNITY SEARCH TOOL:...

412

Black Gold & Fools Gold: Speculation in the Oil Futures Market  

E-Print Network (OSTI)

This paper addresses the question of whether the oil price spike of 2003-2008 was a bubble. We document and discuss what is known about the level of speculation in the paper oil market. We then analyze the dynamics of the ...

Parsons, John E.

413

Experience with low-energy gold-gold operations in RHIC during FY 2010  

SciTech Connect

During Run-10, RHIC operated at several different Au-Au collision energies, as requested mainly by the STAR collaboration in a quest to search for the critical point in the QGP phase diagram. The center-of-mass energies {radical}s{sub NN} are listed in Table 1, together with the respective start and end dates and the duration of the respective run at each energy. While STAR defines 'low energy' as anything below {radical}s{sub NN} = 39 GeV, we focus in the scope of this paper on energies below the regular RHIC injection energy of {radical}s{sub NN} {approx} 20 GeV, since this energy regime is particularly challenging for stable RHIC operations. Figures 1 and 2 show the evolution of beam intensity and luminosity during the course of the {radical}s{sub NN} = 7.7 GeV and 11.5 GeV run. In the following sections we will recapitulate the modifications during the run that led to significant performance improvements, and summarize what was learned at the various energies for possible application in future runs.

Montag, C.; Satogata, T.; Ahrens, L.A.; Bai, M.; Beebe-Wang, J.; Blacker, I.; et al

2011-10-07T23:59:59.000Z

414

The New Gold Standard: Environmental Management Introduces the First LEED Gold Industrial Facility  

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

The buildings efficient design is expected to result in an energy cost savings of more than 70 percent over the life of the facility.

415

The Nature of Gold: An Environmental History of the Klondike Gold Rush  

E-Print Network (OSTI)

>, Reference Librarian, University of Idaho Library,Moscow, Idaho 83844-2350 USA. TEL: 1 208-885-6066.Robert D. Hook University of Idaho, USA Kathryn Morse. The

Hook, Robert D.

2005-01-01T23:59:59.000Z

416

Transmit beamforming for multiple antenna systems with imperfect feedback  

E-Print Network (OSTI)

2.3.1 FDD System . . . . . . . . . . . . . . . . . . . . . .2.3.2 FDD with Finite Rate Feedback (FDDQ) System . 2.3.3loop transmit diversity in FDD WCDMA, in IEEE Symp. on

Isukapalli, Yogananda R.

2009-01-01T23:59:59.000Z

417

Interference management in multiple-antenna wireless networks  

E-Print Network (OSTI)

frequency-division duplexing (FDD) since it enables flexibleHence, in addition to the FDD mode, the third-generationCSI CSMA/CA CTS dB DCA DL FCA FDD FIFO GPS IADCA IEEE i.i.d.

Spyropoulos, Ioannis

2009-01-01T23:59:59.000Z

418

Power Distribution Options for LWA Active-Antennas  

E-Print Network (OSTI)

We examine a variety of power distribution methods for use in LWA-1 with an emphasis on determining whether a bias-T should be incorporated into future designs. We recommend that serious consideration be given to supplying power to the active baluns via bias-T units. If low level 60 Hz artifacts passing through the bias-T networks do not present an insurmountable receiver design problem, we would specifically recommend their use in distributing low voltage AC (e.g. 12.6 VAC) from a central transformer. I.

Brian Hicks; Nagini Paravastu; Paul Ray

2007-01-01T23:59:59.000Z

419

Porcelain-Coated RF Antenna - Lawrence Berkeley National ...  

... cyclotrinos, medical proton therapy, neutral, positive or negative beam applications, fusion. Neutron Tubes ...

420

The Antenna Placement Problem for Mobile Radio Networks  

E-Print Network (OSTI)

on a grid, e.g. service test points, tra?c test points and can- didate sites. Radio transmission is modelled that T #26; S #26; R. Usually the RTPs form a rectangular grid. The position of a candidate site does not have to coincide with a RTP. Figure 1 shows an example of a data map. Candidate sites a

Behnke, Sven

Note: This page contains sample records for the topic "gold antennas metasurface" 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

SPIRAL RF-INDUCTION ANTENNA BASED ION SOURCE FOR NEUTRON ...  

Solar Photovoltaic; Solar Thermal; Startup America; Vehicles and Fuels; ... The Regents of the University of California (Oakland CA) Application Number: 12/ 425,951:

422

The Spaced Antenna Technique for Radar Wind Profiling  

Science Conference Proceedings (OSTI)

The Doppler method for radar wind profiling of the troposphere and stratosphere has been the standard technique used for operational and most research applications of the instrumentation. An alternative approach for measuring winds, by making use ...

M. F. Larsen; J. Rttger

1989-12-01T23:59:59.000Z

423

Microsoft Word - Tacoma-Raver-Substation-Antenna-CX.doc  

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

Government Department of Energy Bonneville Power Administration DATE: 'HFHPEHU &25;&15; &21;&19;&20;&19; REPLY TO ATTN OF: .(&&16;&23; SUBJECT: (QYLURQPHQWDO &OHDUDQFH 0HPRUDQGXP 'DYLG 7ULSS 3URMHFW...

424

Thunderstorm Observations by Air-Shower Radio Antenna Arrays  

E-Print Network (OSTI)

Relativistic, charged particles present in extensive air showers lead to a coherent emission of radio pulses which are measured to identify the shower initiating high-energy cosmic rays. Especially during thunderstorms, there are additional strong electric fields in the atmosphere, which can lead to further multiplication and acceleration of the charged particles and thus have influence on the form and strength of the radio emission. For a reliable energy reconstruction of the primary cosmic ray by means of the measured radio signal it is very important to understand how electric fields affect the radio emission. In addition, lightning strikes are a prominent source of broadband radio emissions that are visible over very long distances. This, on the one hand, causes difficulties in the detection of the much lower signal of the air shower. On the other hand the recorded signals can be used to study features of the lightning development. The detection of cosmic rays via the radio emission and the influence of s...

Apel, W D; Bhren, L; Bekk, K; Bertaina, M; Biermann, P L; Blmer, J; Bozdog, H; Brancus, I M; Buchholz, P; Buitink, S; Cantoni, E; Chiavassa, A; Daumiller, K; de Souza, V; Doll, P; Ender, M; Engel, R; Falcke, H; Finger, M; Fuhrmann, D; Gemmeke, H; Grupen, C; Haungs, A; Heck, D; Hrandel, J R; Horneffer, A; Huber, D; Huege, T; Isar, P G; Kampert, K -H; Kang, D; Krmer, O; Kuijpers, J; Link, K; Luczak, P; Ludwig, M; Mathes, H J; Melissas, M; Morello, C; Nehls, S; Oehlschlger, J; Palmieri, N; Pierog, T; Rautenberg, J; Rebel, H; Roth, M; Rhle, C; Saftoiu, A; Schieler, H; Schmidt, A; Schrder, F G; Sima, O; Toma, G; Trinchero, G C; Weindl, A; Wochele, J; Wommer, M; Zabierowski, J; Zensus, J A; 10.1016/j.asr.2011.06.003

2013-01-01T23:59:59.000Z

425

Antenna-coupled bolometer arrays using transition-edge sensors  

E-Print Network (OSTI)

Wave Microstrip Transmission Line, J. of Phys. D: Appl.on-chip as part of the transmission line used to feed themicrostrip transmission line. Superconducting transmission

2004-01-01T23:59:59.000Z

426

The Compact RCS / Antenna Range at MIT Lincoln Laboratory  

E-Print Network (OSTI)

A new compact range with a state-of-the-art instrumentation system was installed at Lincoln Laboratory and is currently in use. This paper describes the chamber with varied-height absorber, the rolled-edge reflector and ...

Shields, Michael W.

427

Antenna Beam Patterns and Dual-Wavelength Processing  

Science Conference Proceedings (OSTI)

The detection of hail with a dual-wavelength radar system can succeed only when the two essentially independent radars used are correctly calibrated, when attenuation is correctly handled, and when the radars sample the same volume in space. The ...

Ronald E. Rinehart; John D. Tuttle

1982-12-01T23:59:59.000Z

428

Interference management in multiple-antenna wireless networks  

E-Print Network (OSTI)

truncated root-raised-cosine (RRC) chip pulse with roll-offCell radius R c = 500 m RRC roll-off factor Target averagedynamic channel allocation RLS RRC RTS SINR SNR TDD TORB UL

Spyropoulos, Ioannis

2009-01-01T23:59:59.000Z

429

Circuit modeling methodology for UWB omnidirectional small antennas  

E-Print Network (OSTI)

of Electrical Engineering and Computer Science, Universitythe Electrical Engineering and Computer Science Faculty,in the Electrical Engi- neering and Computer Science

Wang, Stanley B; Niknejad, Ali M; Brodersen, Robert W

2006-01-01T23:59:59.000Z

430

Cross-Layer Design for Wireless Networks Using Antenna Arrays  

E-Print Network (OSTI)

value as the weak interference budget of link (u, v). At thebound the number of weak interferers for a link. Controllingof V' Feasible Weak Interferers for the links in F' Figure

Gelal, Ece

2009-01-01T23:59:59.000Z

431

High-Tech Measurements for High-Frequency Antennas  

Science Conference Proceedings (OSTI)

... to compare and validate measurements at different facilities. ... ongoing research at the new facility. ... atmosphere can provide essential information on ...

2013-11-19T23:59:59.000Z

432

Antenna Parameter Measurement by Near-Field Techniques  

Science Conference Proceedings (OSTI)

... Lab Tour. Thursday, September 20th. ... Lab Tour. September 20th. Ron Wittmann (Spherical Near-Field Theory); Michael Francis (Uncertainty Analysis ...

2012-04-25T23:59:59.000Z

433

Coherent detection method of gravitational wave bursts for spherical antennas  

E-Print Network (OSTI)

We provide a comprehensive theoretical framework and a quantitative test of the method we recently proposed for processing data from a spherical detector with five or six transducers. Our algorithm is a trigger event generator performing a coherent analysis of the sphere channels. In order to test our pipeline we first built a detailed numerical model of the detector, including deviations from the ideal case such as quadrupole modes splitting, and non-identical transducer readout chains. This model, coupled with a Gaussian noise generator, has then been used to produce six time series, corresponding to the outputs of the six transducers attached to the sphere. We finally injected gravitational wave burst signals into the data stream, as well as bursts of non-gravitational origin in order to mimic the presence of non-Gaussian noise, and then processed the mock data. We report quantitative results for the detection efficiency versus false alarm rate and for the affordability of the reconstruction of the direction of arrival. In particular, the combination of the two direction reconstruction methods can reduce by a factor of 10 the number false alarms due to the non-Gaussian noise.

S. Foffa; R. Sturani

2008-12-22T23:59:59.000Z

434

Channel estimation and feedback for multiple antenna communication  

E-Print Network (OSTI)

Finite Rate Feedback, in Proc. MILCOM, Atlantic City, NJ,nite rate feedback, in Proc. MILCOM, (Atlantic City, NJ),

Murthy, Chandra Ramabhadra

2006-01-01T23:59:59.000Z

435

I am the antenna: accurate outdoor AP location using smartphones  

Science Conference Proceedings (OSTI)

Today's WiFi access points (APs) are ubiquitous, and provide critical connectivity for a wide range of mobile networking devices. Many management tasks, e.g. optimizing AP placement and detecting rogue APs, require a user to efficiently determine the ... Keywords: access point location, smartphones, wifi

Zengbin Zhang; Xia Zhou; Weile Zhang; Yuanyang Zhang; Gang Wang; Ben Y. Zhao; Haitao Zheng

2011-09-01T23:59:59.000Z

436

The electrochemical characteristics of blue copper protein monolayers on gold  

E-Print Network (OSTI)

and Photonics Applications Systems Technologies (PhAST), 2008, San Jose, California, USA, Technical Digest

Tuscia, Università Degli Studi Della

437

Technology Commercialization and Partnerships | BSA 12-43: Gold ...  

Intellectual Property Legal Group (Legal Dept.) Dorene Price, Chief Intellectual Property Counsel Lars Husebo, Attorney Maria Pacella, Sr. Staff Specialist

438

Recovery of Gold (Au) from Discarded Printed Circuit Boards (PCBs)  

Science Conference Proceedings (OSTI)

... gentle heat and maintaining high pH to prevent the formation of toxic HCN gas. ... Molybdenum and Nickel from Mo-Ni Ore of Black Shale without Reagent.

439

Gold Hill, Colorado: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

2645°, -106.0483521° 2645°, -106.0483521° 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":39.5452645,"lon":-106.0483521,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

440

Gold River, California: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

2937°, -121.2466156° 2937°, -121.2466156° 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":38.6262937,"lon":-121.2466156,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Gold Hill, Oregon: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Hill, Oregon: Energy Resources Hill, Oregon: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 42.4317894°, -123.0506035° 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":42.4317894,"lon":-123.0506035,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

442

Liquid Gold: Breast Milk Banking in the United States  

E-Print Network (OSTI)

Boston Directory, even though both organizations recruitedat the Directory in Boston, the San Francisco organizationDirectory was firmly embedded in the social welfare organizations

Pineau, Marisa

2012-01-01T23:59:59.000Z

443

Giving Gold Alloys Room to Breathe - Materials Technology @ TMS  

Science Conference Proceedings (OSTI)

Jun 12, 2013 ... Scientists at the U.S. Department of Energy's Brookhaven National Laboratory have discovered a streamlined process of creating uniquely...

444

Novel gold cantilever for nano-Raman spectroscopy of graphene  

Science Conference Proceedings (OSTI)

This paper presents the simultaneous topographical and tip-enhanced Raman imaging of single layer and multilayer graphene flakes. The probe tips suitable for tapping mode atomic force microscopy (AFM) and tip-enhanced Raman spectroscopy have been fabricated ... Keywords: Atomic force microscopy, Graphene, Nano-Raman, Tip-enhanced

Valentinas Snitka; Raul D. Rodrigues; Vitas Lendraitis

2011-08-01T23:59:59.000Z

445

Oxidation Kinetics of Gold Nanoparticles for Growth of Graphene ...  

Science Conference Proceedings (OSTI)

Finally, in regard to the plasmonic applications of such hybrid nanoparticles, a series of ... A New Method for the Synthesis of Aluminum Oxide Nanofibers: Features and ... A Novel Electrochemical Process for Assembling Hierarchically Aligned ... Chemical Functionalization of Hydrogen-terminated Silicon Surfaces for...

446

Voltage Controlled Creep of a Nanoporous Gold/Electrolyte Hybrid ...  

Science Conference Proceedings (OSTI)

And the creep rate can also be controlled by the voltage (electrochemical ... CNT Reinforced Copper Composite for High Contact Pressure Electrodes by...

447

Formation of gold and silver nanostructures within polyvinylpyrollidone (PVP) gel  

SciTech Connect

Study on reduction of Au(III) and Ag(I) and the formation of Au and Ag nanostructures was performed on the gels of metal precursor and PVP polymer mixture. Some comparing samples were prepared for better understanding the role of reactants on the reduction of metal ions and further growth of nanocrystals. The results suggest that, in addition to its function of generating stable colloids, PVP not only has a reducing effect on metal ions, but also acts as a crystal growth modifier. At low temperatures, the reducing effect of PVP is strong on Ag(I) ions in AgNO{sub 3}, while the reduction of complex Au(III) ions in HAuCl{sub 4} is slow, involving two steps of Au(III)->Au(I)->Au. In the study of temperature disturbance on crystal growth, Au nanoplates of new and well-defined star shape were observed. The differences in the size and shape of nanoparticles are discussed from the colloid chemistry. - Graphical abstract: If a temperature difference was introduced to the gel of Au{sup 3+}(H{sub 2}O)-PVP, large sized Au nanoplates with new and well-defined star shape were observed.

Kan Caixia, E-mail: cxkan@nuaa.edu.c [College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211100 (China); Wang Changshun [College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211100 (China); Zhu Jiejun [National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 (China); Li Hongchen [College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211100 (China)

2010-04-15T23:59:59.000Z

448

Australasian Fluid Mechanics Conference Crown Plaza, Gold Coast, Australia  

E-Print Network (OSTI)

-directional pump is reasonably feasible. Introduction Underground coal mining is one of the major operations to extract coal from underground mines. The underground mining industry is a very specialized industry where mining system is commonly used for hauling coal and rock from the longwall face. Figure 1 shows

Marusic, Ivan

449

Table of Contents Extension Calendar Wins Gold 1  

E-Print Network (OSTI)

late season pressure; however due to the multiple freezes in the winter of 2010, combined with a cool 500,000 acres of mangroves were removed in the state of Florida and the Miami-Dade County coastline is Restoring Mangroves in Miami- Dade There are three ways to raise money for three yearly youth scholarships

Watson, Craig A.

450

Thermal and Electrical Conductivities of Electroplated Gold (A25695)  

E-Print Network (OSTI)

Proc. Of The 17th Target Fabrication Specialists Meeting, San Diego, California, 2006; To Be Published In Fusion Science And Technology17th Target Fabrication Specialists Meeting San Diego California, US, 2006999613445

Bernat, T.P.

2006-12-08T23:59:59.000Z

451

The 2011 Acta Materialia Gold Medal Symposium: Nanoceramics II ...  

Science Conference Proceedings (OSTI)

Oct 19, 2011 ... Since Ag Nnao Plate(ANP) which is synthesized by a thermal growth method is completely flat(thickness <100nm) and narrow size distribution,...

452

Gold Nano Anchors Put Nanowires in Their Place  

Science Conference Proceedings (OSTI)

... surface as starting points for growing horizontal semiconductor "wires" only 3 ... not only link nanoelectronic devices like conventional wire but also ...

2012-06-05T23:59:59.000Z

453

The 2011 Acta Materialia Gold Medal Symposium: Nanoceramics I ...  

Science Conference Proceedings (OSTI)

Oct 18, 2011... James Scott2; 1University of Puerto Rico; 2University of Cambridge ... and revolutionary prospect in the field of materials for solar energy...

454

Mineral Separation Techniques in Gold Recovery from Refractory Ores  

Science Conference Proceedings (OSTI)

Au-Rich Volcanogenic Massive Sulphide Deposits of the Flin Flon Belt, Manitoba and Saskatchewan Banro Corporation: Investing in Long-Term Community...

455

Achieving Stakeholder Support for New Gold Developments that ...  

Science Conference Proceedings (OSTI)

Au-Rich Volcanogenic Massive Sulphide Deposits of the Flin Flon Belt, Manitoba and Saskatchewan Banro Corporation: Investing in Long-Term Community...

456

Ultra-stable Gold Nanocatalysts - Energy Innovation Portal  

Reducing nitric oxide by hydrogen, propane, or carbon monoxide; Propylene epoxidation, PROX reaction, fuel cell applications, and hydrogenation of unsaturated ...

457

Guided Self-Assembly of Gold Thin Films  

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

Print Wednesday, 21 November 2012 12:18 Nanoparticles-man-made atoms with unique optical, electrical, and mechanical properties-have become key components in many fields of...

458

Not-So-Precious: Stripping Gold From AFM Probes Allows ...  

Science Conference Proceedings (OSTI)

... AB Churnside, RMA Sullan, DM Nguyen, SO Case, MS Bull, GM King and TT Perkins. Routine and timely sub-piconewton ...

2013-07-08T23:59:59.000Z

459

Gold Nano-Engineered Mercury Sensor for Alumina Refineries  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, 2010 TMS Annual Meeting & Exhibition. Symposium , 2010 Functional and Structural Nanomaterials: Fabrication, Properties,...

460

Fool's Gold in the Nation's Data-Mining Programs  

Science Conference Proceedings (OSTI)

Under the USA PATRIOT Act, the government has a wide range of options to use in what has been labeled as the "War Against Terror." Among those options is the use of data-mining programs. More than 50 federal departments and agencies are now using about ... Keywords: "no-fly" lists, Aetna Insurance, Amazon.com, American Civil Liberties Union, Blue Cross and Blue Shield, Calyx, ChoicePoint, Computer-Assisted Passenger Profiling System (CAPPS II), Department of Homeland Security, Electronic Privacy Information Center, Federal Bureau of Investigation, First Amendment, George W. Bush, John Ashcroft, MATRIX, Republican National Convention, Seisint, Terrorist Information Awareness Program (TIAP), Terrorist Information and Prevention System (Operation TIPS), Terrorist Threat Integration Center, Torch Concepts, Total Information Awareness Program (TIAP), Transportation Security Administration, USA PATRIOT Act, civil liberties, civil rights, data mining, jetBlue Airways, privacy

Walter M. Brasch

2005-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" 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

B6: Gold Nanoparticles Modified Porous Titania Mats for ...  

Science Conference Proceedings (OSTI)

Interaction of Tourmaline Mineral Powders with Sea Water and its Anti-microbial ... Novel Self-foaming Cellular Composites Produced from Recycled Water...

462

Nonstick and Laser-safe Gold Aids Laser Trapping of ...  

Science Conference Proceedings (OSTI)

... (A one-kilogram mass on the Earth's surface exerts a force of roughly 10 newtons. A piconewton is 0.000 000 000 001 newtons. ...

2011-03-24T23:59:59.000Z

463

Recovery of Gold by Using Biomass Wastes Containing ... - TMS  

Science Conference Proceedings (OSTI)

May 1, 2007 ... TMS Member price: 10.00. Non-member price: 25.00. TMS Student Member price : 10.00. Product In Stock. Description New recovery method of...

464

In-situ Observation of Morphological Changes of Gold Nanorods ...  

Science Conference Proceedings (OSTI)

What Can we Learn from Atomic Scale Calculations of Grain Boundary Properties? What Can We Learn from Measurements of Li-ion Battery Single Particles?

465

SLAC National Accelerator Laboratory - X-ray Laser Brings Gold...  

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

a variety of chemical reactions, and nanocrystals of barium titanate, which multiply energy storage capacity in electronics. "Little bits of optimization of catalysts can go...

466

Syngenetic Gold: Lode Vein Geology and Exploration Implications  

Science Conference Proceedings (OSTI)

LV grades reflect geothermal fluid composition, P-T and sedimentation rates. Structural upgrading is not required. Syngenesis clarifies and simplifies genetic...

467

Development and Mechanistic Investigations of Gold-Catalyzed Reactions  

E-Print Network (OSTI)

nshapiro DRX?500 5 mm BBO BB?1H zg30 CDCl3 Hz Hz sec usecusec K sec ======== CHANNEL f1======== NUC1 1H P1 12.20 usec PL1 ?5.00 dB SFO1 500.0530878

Shapiro, Nathan David

2010-01-01T23:59:59.000Z

468

NIST Reference Materials Are 'Gold Standard' for Bio ...  

Science Conference Proceedings (OSTI)

... atomic force microscopy (AFM), transmission electron microscopy (TEM), scanning electron microscopy (SEM), differential mobility analysis (DMA ...

2012-03-19T23:59:59.000Z

469

Green and Gold: NIST Boulder's New Laboratory Achieves ...  

Science Conference Proceedings (OSTI)

... Water savings through low-flow fixtures achieve an estimated 42 percent ... Efficient lighting fixtures reduce energy use by an estimated 47 percent. ...

2013-02-27T23:59:59.000Z

470

Improvements in Leaching of Gold and Silver from Sulphide Ore ...  

Science Conference Proceedings (OSTI)

A laboratory study was conducted to increase silver extraction and to reduce the ... Massive Sulfide Deposits of the Bathurst Mining Camp, New Brunswick.

471

NNSA National Security Campus Receives LEED Gold Certification...  

National Nuclear Security Administration (NNSA)

Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering...

472

A Simple Gradient Sign Algorithm for Transmit Antenna Weight Adaptation with Feedback  

E-Print Network (OSTI)

frequency division duplexing (FDD), such that the downlinkmust be used, which in FDD systems requires feedback from

Banister, B C; Zeidler, J R

2003-01-01T23:59:59.000Z

473

Wireless channel characterization at 2.4 GHz for multiple antenna systems  

E-Print Network (OSTI)

dependent urban MIMO channel in FDD communicationsystems,frequency-division-duplex (FDD) transmission systems using

Wood, Leslie Caroline

2008-01-01T23:59:59.000Z

474

Performance analysis of multi-antenna OFDM systems with phase noise and imperfect channel estimation  

E-Print Network (OSTI)

of frequency division duplex FDD transmission systems usingStandards Institute FDMA FDD FEC FFT FLASH-OFDM Frequencyfrequency division duplex (FDD) and time division duplex (

Jalloh, Mohamed

2009-01-01T23:59:59.000Z

475

UWB Transmission and MIMO Antenna Systems for Nomadic Users and Mobile PANs  

Science Conference Proceedings (OSTI)

Personal Area Networks (PANs) are expected to play an important role in future mobile communications and information systems. A proliferation of low data rate sensor and control devices is envisioned. These devices must be able to communicate across ... Keywords: MIMO, PAN, QoS, UWB, WLAN, wireless

J. Farserotu; A. Hutter; F. Platbrood; J. Ayadi; J. Gerrits; A. Pollini

2002-08-01T23:59:59.000Z

476

A Scalable and Cost Effective Architecture for High Gain Beamforming Antennas  

E-Print Network (OSTI)

circuit transmission- line transformer power combiner forcircuit techniques for power combining use transformers andtransmission lines: 1) Transformer-based power combiners: a

BAKR, Omar Mohammed

2010-01-01T23:59:59.000Z

477

Multiple Exciton Coherence Sizes in Photosynthetic Antenna Complexes viewed by Pump-Probe Spectroscopy  

E-Print Network (OSTI)

at the red wing.21 A total line width of ) 430 cm-1 and a homogeneous width 188 cm-1 was found in ref 17

Mukamel, Shaul

478

Fixed-Antenna Pointing-Angle Calibration of Airborne Doppler Cloud Radar  

Science Conference Proceedings (OSTI)

Doppler velocity measurements from airborne meteorological Doppler radars require removal of the aircraft motion contribution in order to provide radial velocity of hydrometeor targets. This is a critical step for hydrometeor motion and wind ...

Samuel Haimov; Alfred Rodi

2013-10-01T23:59:59.000Z

479

Joint Routing and Scheduling in Multi-hop Wireless Networks with Directional Antennas  

E-Print Network (OSTI)

Long-distance multi-hop wireless networks have been used in recent years to provide connectivity to rural areas. The salient features of such networks include TDMA channel access, nodes with multiple radios, and point-to-point ...

Dutta, Partha

480

Antenna-coupled Superconducting Bolometers for Observations of the Cosmic Microwave Background Polarization  

E-Print Network (OSTI)

of matter and blackbody radiation expanded and cooledthe already tiny 3 K blackbody radiation. While COBE showed

Myers, Michael James

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gold antennas metasurface" 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

Voltage Node Arcing in the ICRH Antenna Vacuum Transmission Lines at JET  

Science Conference Proceedings (OSTI)

The observation of parasitic low-VSWR activity during operations of JET RF plant and the damage caused by arcing at the voltage-node in the vacuum transmission line (VTL) in 2004 highlight the importance of the problem of low-voltage breakdown in the ICRH systems. Simulations demonstrate little response of the RF circuit to the voltage-node arcing which explains why it remains largely unnoticed and complicates the design of protection systems. Analysis of the damage pattern produced by the voltage-node arcing suggests that multipactor-related phenomena occurring at elevated voltage thresholds in conditions of unfavorable VTL geometry are most plausible arc-provoking factors.

Monakhov, I.; Graham, M.; Mayoral, M.-L.; Nicholls, K.; Walden, A. [Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); Bobkov, V. [Max-Planck Institut fuer Plasmaphysik, EURATOM Association, D-85748 Garching (Germany)

2007-09-28T23:59:59.000Z