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Note: This page contains sample records for the topic "axial electric field" from the National Library of EnergyBeta (NLEBeta).
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We encourage you to perform a real-time search of NLEBeta
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1

Axial Current Generation from Electric Field: Chiral Electric Separation Effect  

E-Print Network [OSTI]

We study a relativistic plasma containing charged chiral fermions in an external electric field. We show that with the presence of both vector and axial charge densities, the electric field can induce an axial current along its direction and thus cause chirality separation. We call it the Chiral Electric Separation Effect (CESE). On very general basis, we argue that the strength of CESE is proportional to $\\mu_V\\mu_A$ with $\\mu_V$ and $\\mu_A$ the chemical potentials for vector charge and axial charge. We then explicitly calculate this CESE conductivity coefficient in thermal QED at leading-log order. The CESE can manifest a new gapless wave mode propagating along the electric field. Potential observable of CESE in heavy-ion collisions is also discussed.

Xu-Guang Huang; Jinfeng Liao

2013-06-07T23:59:59.000Z

2

Effect of an axial electric field on detonation waves.  

E-Print Network [OSTI]

??The present thesis reports an investigation of the effects of an axial electric field (200V/cm – 8000V/cm) on the propagation of detonation waves in mixtures… (more)

Kamenskihs, Vsevolods

2011-01-01T23:59:59.000Z

3

Computation of the Field in an Axial Gap, Trapped-Flux Type Superconducting Electric Machine  

E-Print Network [OSTI]

-type superconducting electric machine. The use of superconducting materials in electric machines can lead to increases in efficiency, as well as power density, which results in reductions in both the size and weight of the machine. In this paper, the authors present a... method to compute the field in such an electric machine generated by an array of fully magnetized bulk superconductors. Analytical expressions are derived for the field that would exist in the coil region of the motor, which will act as a powerful tool...

Shen, Zejun; Ainslie, Mark D.; Campbell, Archie M.; Cardwell, David A.

2014-11-04T23:59:59.000Z

4

E-Print Network 3.0 - axial electric field Sample Search Results  

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

Following up on our previous work on 2nd generation flat tape... technology would be the Holy Grail", J. Schwartz of the National High Field Magnet Laboratory, plenary Source: van...

5

A University of Alabama Axial-Gap Electric Motor Developmenty  

E-Print Network [OSTI]

CAVT A University of Alabama Axial-Gap Electric Motor Developmenty Research Center OBJECTIVE ­ Develop axial gap permanent-magnet electric Axial motor ­ Develop axial gap permanent-magnet electric motor topologies with high torque and power densities MOTIVATION ­ Axial-gap ("pancake") motors have

Carver, Jeffrey C.

6

Axial power loss along open field lines  

SciTech Connect (OSTI)

Studies are underway to evaluate the linear mirror geometry as a candidate for a high-fluence, neutron irradiation facility. This steady-state, low-Q design is currently perceived to comprise a two-component plasma driven by neutral beams with mirror confinement of the hot ions and with no electrostatic axial reduction in the warm ion end losses. Warm-ion fueling and end-wall power density will require substantial cold plasma exterior to the mirror cell and neutral gas near the end wall. In this paper, we evaluate to what extent the loss power parallel to the axial magnetic field along open field lines is a function of the escaping plasma and end-wall parameters. By allowing the source power to depend directly on the plasma density and electron temperature, several new conclusions may be pertinent to closed field-line geometries with open field-line divertors.

Correll, D.L.

1987-08-01T23:59:59.000Z

7

Axial Distributions of Spectral Line Intensities in the Arc Under the Influence of External Rotating Magnetic Field  

Science Journals Connector (OSTI)

The influence of external rotating magnetic field (RMF) on the electric arc plasma, and therefore the axial distributions of the spectral line intensities and the atomic...

Pavlovic, B V; Mihailidi, T A

1981-01-01T23:59:59.000Z

8

Field Examples of Axial Cracked Bearings in Wind Turbine Gearboxes...  

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

Field Examples of Axial Cracked Bearings in Wind Turbine Gearboxes Presented by Paul John Baker of FrontierPro Services at the Wind Turbine Tribology Seminar 2014. 141030 Axial...

9

Determination of Electric-Field, Magnetic-Field, and Electric...  

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

Electric-Field, Magnetic-Field, and Electric-Current Distributions of Infrared Optical Antennas: A Near-Field Determination of Electric-Field, Magnetic-Field, and Electric-Current...

10

LABORATORY II ELECTRIC FIELDS AND ELECTRIC POTENTIALS  

E-Print Network [OSTI]

Lab II - 1 LABORATORY II ELECTRIC FIELDS AND ELECTRIC POTENTIALS In this lab you will continue to investigate the abstract concept of electric field. If you know the electric field at a point in space, you). With this simulation you can construct a complicated charge configuration and read out the resulting electric field

Minnesota, University of

11

Ch 16 Electric Charge &Ch 16. Electric Charge & Electric Field  

E-Print Network [OSTI]

Ch 16 Electric Charge &Ch 16. Electric Charge & Electric Field Liu UCD Phy1B 2012 #12;I Basic ConceptsI. Basic Concepts Static electricity: charges at rest Electric charge Like charges repel Unlike charges attract Liu UCD Phy1B 2012 #12;Electric ChargeElectric Charge Electron charge: -eElectron charge

Yoo, S. J. Ben

12

Bacteriochlorophyll in Electric Field  

Science Journals Connector (OSTI)

We have used time dependent density functional theory (TDDFT) and a multilevel perturbation model to study the transition energies, polarizability, and dipole moments of a bacteriochlorophyll in an electric field. ... coupling strengths yield Car(S1)-to-BChl(Qy) excitation energy transfer times that are in good agreement with recent exptl. ...

Pär Kjellberg; Zhi He; Tõnu Pullerits

2003-11-15T23:59:59.000Z

13

Topology of magnetars external field – I. Axially symmetric fields  

Science Journals Connector (OSTI)

......Actually, their energy output in the 20-200...than their rotational energy losses. This, together...explaining in a simple and economical way most of the observed...analogous to that for the solar magnetic field (e...spectra exhibit a high-energy tail, superimposed to......

L. Pavan; R. Turolla; S. Zane; L. Nobili

2009-05-11T23:59:59.000Z

14

Axisymmetry vs. nonaxisymmetry of hydromagnetic Taylor-Couette flows with axial electric currents  

E-Print Network [OSTI]

The stability of a Taylor-Couette flow with resting outer cylinder under the influence of a homogeneous axial electric current is investigated. In the linear theory the critical Reynolds number for axisymmetric perturbations Re=68 is not influenced by the current-induced magnetic field but all the axisymmetric magnetic perturbations decay. The nonaxisymmetric perturbations with |m|=1 are excited even without rotation for large enough Hartmann numbers ('Tayler Instability') but the growth rate increases with Reynolds number. In the nonlinear regime shear energy is pumped into the neighboring modes m=0 and |m|=2. The ratio q of the energy of the magnetic |m|=1 modes and the toroidal background field is very small for the pure (non-rotating) Tayler instability and grows strongly if differential rotation is present. For super-Alfv\\'enic rotation the energy in the |m|=1 modes of flow and field are in equipartition, with about 1% of the centrifugal energy of the inner cylinder. If the electric current is strong eno...

Gellert, M; Rüdiger, G

2013-01-01T23:59:59.000Z

15

Dispersion relation and growth rate in a Cherenkov free electron laser: Finite axial magnetic field  

SciTech Connect (OSTI)

A theoretical analysis is presented for dispersion relation and growth rate in a Cherenkov free electron laser with finite axial magnetic field. It is shown that the growth rate and the resonance frequency of Cherenkov free electron laser increase with increasing axial magnetic field for low axial magnetic fields, while for high axial magnetic fields, they go to a saturation value. The growth rate and resonance frequency saturation values are exactly the same as those for infinite axial magnetic field approximation. The effects of electron beam self-fields on growth rate are investigated, and it is shown that the growth rate decreases in the presence of self-fields. It is found that there is an optimum value for electron beam density and Lorentz relativistic factor at which the maximum growth rate can take place. Also, the effects of velocity spread of electron beam are studied and it is found that the growth rate decreases due to the electron velocity spread.

Kheiri, Golshad; Esmaeilzadeh, Mahdi [Department of Physics, Iran University of Science and Technology, Tehran 16844 (Iran, Islamic Republic of)] [Department of Physics, Iran University of Science and Technology, Tehran 16844 (Iran, Islamic Republic of)

2013-12-15T23:59:59.000Z

16

Photon statistics in a free-electron laser with an axial-guide magnetic field  

Science Journals Connector (OSTI)

Starting from an initial state with an electron energy p02/2m+??c/2, a vacuum-laser field, and a coherent wiggler field, I discuss photon statistics in a free-electron laser with an axial-guide magnetic field. It is found that the axial field can weaken the squeezing, enhance the positive (for ?>0) and negative (for ?0) and antibunching (for ?<0).

Gou San-kui

1992-07-15T23:59:59.000Z

17

Electric field statistics in MHD turbulence  

E-Print Network [OSTI]

Electric field statistics in MHD turbulence Bernard Knaepen, Nicolas Denewet & Daniele Carati, ULB #12;Electric field statistics in MHD turbulence Outline Electric field in MHD? Particle acceleration Statistics of the electric & magnetic fields #12;Outline Electric field in MHD? Particle acceleration

Low, Robert

18

Capillary Bridges in Electric Fields  

Science Journals Connector (OSTI)

Capillary Bridges in Electric Fields ... The separation d between the electrodes could be varied using a stepping motor with a nominal step width of 0.625 ?m. ... New York: NcGraw-Hill Co. 1950; Smythe, Static and Dynamic Electricity. ...

Anke Klingner; Juergen Buehrle; Frieder Mugele

2004-07-02T23:59:59.000Z

19

Electric Charge and Electric Field Electrostatics: Charge at rest  

E-Print Network [OSTI]

Chapter 16 Electric Charge and Electric Field #12;Electrostatics: Charge at rest Electric Charges of conservation of Electric Charge: The net amount of electric charge produced in any process is zero. Model, neutral). #12;· All protons and electrons have same magnitude of electric charge but their masses

Yu, Jaehoon

20

Apparatuses and methods for generating electric fields  

DOE Patents [OSTI]

Apparatuses and methods relating to generating an electric field are disclosed. An electric field generator may include a semiconductive material configured in a physical shape substantially different from a shape of an electric field to be generated thereby. The electric field is generated when a voltage drop exists across the semiconductive material. A method for generating an electric field may include applying a voltage to a shaped semiconductive material to generate a complex, substantially nonlinear electric field. The shape of the complex, substantially nonlinear electric field may be configured for directing charged particles to a desired location. Other apparatuses and methods are disclosed.

Scott, Jill R; McJunkin, Timothy R; Tremblay, Paul L

2013-08-06T23:59:59.000Z

Note: This page contains sample records for the topic "axial electric field" 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

Electric field divertor plasma pump  

DOE Patents [OSTI]

An electric field plasma pump includes a toroidal ring bias electrode (56) positioned near the divertor strike point of a poloidal divertor of a tokamak (20), or similar plasma-confining apparatus. For optimum plasma pumping, the separatrix (40) of the poloidal divertor contacts the ring electrode (56), which then also acts as a divertor plate. A plenum (54) or other duct near the electrode (56) includes an entrance aperture open to receive electrically-driven plasma. The electrode (56) is insulated laterally with insulators (63,64), one of which (64) is positioned opposite the electrode at the entrance aperture. An electric field E is established between the ring electrode (56) and a vacuum vessel wall (22), with the polarity of the bias applied to the electrode being relative to the vessel wall selected such that the resultant electric field E interacts with the magnetic field B already existing in the tokamak to create an E.times.B/B.sup.2 drift velocity that drives plasma into the entrance aperture. The pumped plasma flow into the entrance aperture is insensitive to variations, intentional or otherwise, of the pump and divertor geometry. Pressure buildups in the plenum or duct connected to the entrance aperture in excess of 10 mtorr are achievable.

Schaffer, Michael J. (San Diego, CA)

1994-01-01T23:59:59.000Z

22

Electric field divertor plasma pump  

DOE Patents [OSTI]

An electric field plasma pump includes a toroidal ring bias electrode positioned near the divertor strike point of a poloidal divertor of a tokamak, or similar plasma-confining apparatus. For optimum plasma pumping, the separatrix of the poloidal divertor contacts the ring electrode, which then also acts as a divertor plate. A plenum or other duct near the electrode includes an entrance aperture open to receive electrically-driven plasma. The electrode is insulated laterally with insulators, one of which is positioned opposite the electrode at the entrance aperture. An electric field E is established between the ring electrode and a vacuum vessel wall, with the polarity of the bias applied to the electrode being relative to the vessel wall selected such that the resultant electric field E interacts with the magnetic field B already existing in the tokamak to create an E [times] B/B[sup 2] drift velocity that drives plasma into the entrance aperture. The pumped plasma flow into the entrance aperture is insensitive to variations, intentional or otherwise, of the pump and divertor geometry. Pressure buildups in the plenum or duct connected to the entrance aperture in excess of 10 mtorr are achievable. 11 figs.

Schaffer, M.J.

1994-10-04T23:59:59.000Z

23

10 Ways to "See" the Electric Field  

Broader source: Energy.gov [DOE]

How can you demonstrate the electric field if it's invisible? This video shows you 10 activities and experiments that help to teach about the electric field using various apparatuses, such as a plasma ball or a Van de Graaff generator.

24

Self-field effects on instability of wave modes in a two-stream free-electron laser with an axial magnetic field  

SciTech Connect (OSTI)

Free electron lasers (FEL) play major roles in the Raman Regime, due to the charge and current densities of the beam self-field. The method of perturbation has been applied to study the influence of self-electric and self-magnetic fields. A dispersion relation for two-stream free electron lasers with a helical wiggler and an axial magnetic field has been found. This dispersion relation is solved numerically to investigate the influence of self-fields on the FEL coupling and the two-stream instability. It was found that self-fields can produce very large effects on the FEL coupling, but they have almost negligible effects on two-stream instability.

Mohsenpour, Taghi, E-mail: mohsenpour@umz.ac.ir; Rezaee Rami, Omme Kolsoum [Department of Physics, Faculty of Basic Sciences, University of Mazandaran, Babolsar (Iran, Islamic Republic of)

2014-07-15T23:59:59.000Z

25

ECE 390 Electric & Magnetic Fields Catalog Description: Static and quasi-static electric and magnetic fields.  

E-Print Network [OSTI]

ECE 390 ­ Electric & Magnetic Fields Catalog Description: Static and quasi-static electric), A. Jander (secondary) Course Content: · Introduction, review of vector analysis · Static electric fields in free space: Coulomb's law, Gauss's law, and electric potential, electric dipole · Static

26

Progress In Electromagnetics Research M, Vol. 35, 173182, 2014 Three-Dimensional Analytical Model for an Axial-Field  

E-Print Network [OSTI]

--In this paper, we propose an analytical method for modeling a permanent magnets axial field magnetic coupling. Shaft Rout Magnets Soft-Iron yoke h h Rin e To load From motor Magnetic coupling Figure 1. Structure equipped with axially magnetized permanent magnets (PMs). The PMs are glued on an iron yoke to form a north

Paris-Sud XI, Université de

27

Entanglement Generation by Electric Field Background  

E-Print Network [OSTI]

The quantum vacuum is unstable under the influence of an external electric field and decays into pairs of charged particles, a process which is known as the Schwinger pair production. We propose and demonstrate that this electric field can generate entanglement. Using the Schwinger pair production for constant and pulsed electric fields, we study entanglement for scalar particles with zero spins and Dirac fermions. One can observe the variation of the entanglement produced for bosonic and fermionic modes with respect to different parameters.

Ebadi, Zahra

2014-01-01T23:59:59.000Z

28

Magnetic Fields Analogous to electric field, a magnet  

E-Print Network [OSTI]

characteristic of elementary particles such as an electron #12;Magnetic Fields Magnetic field lines Direction;Magnetic Fields Magnetic field lines enter one end (south) of magnet and exit the other end (north) Opposite magnetic poles attract like magnetic poles repel #12;Like the electric field lines

Bertulani, Carlos A. - Department of Physics and Astronomy, Texas A&M University

29

Electric and magnetic field exposure associated with electric blankets  

SciTech Connect (OSTI)

electric blankets may be important contributors to the public's overall exposure to 60 Hz electric and magnetic fields (EMFs) since they are common appliances that are used close to the body for long periods of time. This report describes a series of experimental and computer analyses characterizing various aspects of EMF exposure from electric blankets in use prior to Fall 1990. Almost of electric blankets were found to use on/off controllers with cycle periods of minutes. Calculations of magnetic fields within the body show that, when blankets are heating, flux densities averaged over the whole body range from 15--33 mG during the on'' cycle with typical values of 22 mG. Duty cycles are predicted to vary widely from user-to-user, with typical values of perhaps 40%. Given typical blanket usage patterns, the long-term body-averaged magnetic field exposure from blankets is expected to be comparable to that form other EMF sources for a significant fraction of the blanket-using population. No significant differences were found between time-averaged magnetic field exposures from blankets with metal alloy and plastic polymer heating elements. Blankets with alloy and polymer heating elements did differ significantly in electric field exposure. Calculations show that the unperturbed field 5 cm above flat blankets range from 60--150 V/m for alloy heating cables and unperturbed field 5 cm above flat blankets range from 60--150 V/m for alloy heating cables and 10--40 V/m polymer cables. Starting in Fall 1990, electric blanket manufactures introduced new designs that produce much smaller magnetic fields. These are expected to replace the current in-use stock at a rate of 10--15% per year.

Florig, H.K.; Hoburg, J.F. (Carnegie-Mellon Univ., Pittsburgh, PA (United States). Dept. of Engineering and Public Policy)

1991-12-01T23:59:59.000Z

30

The Mechanics of the Electric Field  

Science Journals Connector (OSTI)

... field and would be longer for weak fields than for strong. Now consider an electron oscillating with a definite period Ta. Close to the electrons the electric field may be ... one often used by Lord Kelvin. This is the case of a tightly stretched long string loaded at equal intervals with equal masses. This system has many periods. If P ...

J. J. THOMSON

1926-09-04T23:59:59.000Z

31

Electric Field Control of Ferromagnetism and Magnetic Devices Using Multiferroics  

E-Print Network [OSTI]

4 Electric field control of ferromagnetism: In-plane5 Electric field control of ferromagnetism: out-of-plane6.3.3 Electric field control of spin valve resistance

Heron, John Thomas

2013-01-01T23:59:59.000Z

32

Electric field directed self assembly of nanoparticle structures  

E-Print Network [OSTI]

and Heller, M.J. (2007) Electric-field-directed assembly ofOF THE DISSERTATION Electric Field Directed Self Assembly ofof colloidal particles by electric fields. Soft Matter, 2,

Dehlinger, Dietrich Alexander

2008-01-01T23:59:59.000Z

33

D-branes in overcritical electric fields  

Science Journals Connector (OSTI)

We collect some arguments for treating a D-brane with overcritical electric field as a well-posed initial condition for a D-brane decay. Within the field theoretical toy model of Minahan and Zwiebach we give an estimate for the condensates of the related infinite tower of tachyonic excitations.

Harald Dorn; Mario Salizzoni; Alessandro Torrielli

2006-01-25T23:59:59.000Z

34

Axial interaction free-electron laser  

DOE Patents [OSTI]

Electron orbits from a helical axial wiggler in an axial guide field are absolutely unstable as power is extracted from the particles. For off-axis beams an axial FEL mechanism exists when the axial electric field in a TM mode is wiggled to interact with the axial velocity of the electrons that form the beam. The interaction strength is comparable to that for helical FELs and is insensitive to beam orbit errors. The orbits for this mechanism are extremely stable in the absence of space charge and lead to high extraction efficiencies without particle phasing incoherence or interception. This interaction mechanism is suitable for use with intense annular electron beams for high power generation at microwave frequencies. 5 figs.

Carlsten, B.E.

1997-09-02T23:59:59.000Z

35

Electric field controlled emulsion phase contactor  

DOE Patents [OSTI]

A system is described for contacting liquid phases comprising a column for transporting a liquid phase contacting system, the column having upper and lower regions. The upper region has a nozzle for introducing a dispersed phase and means for applying thereto a vertically oriented high intensity pulsed electric field. This electric field allows improved flow rates while shattering the dispersed phase into many micro-droplets upon exiting the nozzle to form a dispersion within a continuous phase. The lower region employs means for applying to the dispersed phase a horizontally oriented high intensity pulsed electric field so that the dispersed phase undergoes continuous coalescence and redispersion while being urged from side to side as it progresses through the system, increasing greatly the mass transfer opportunity. 5 figs.

Scott, T.C.

1995-01-31T23:59:59.000Z

36

Time-synchronized continuous wave laser-induced fluorescence axial velocity measurements in a diverging cusped field thruster  

Science Journals Connector (OSTI)

Measurements are presented of time-synchronized axial ion velocities at three positions in the discharge channel and plume of a diverging cusped field thruster operating on xenon. Xenon axial ion velocities for the thruster are derived from laser-induced fluorescence measurements of the 5d[4]7/2–6p[3]5/2 xenon ion excited state transition centred at ? = 834.72 nm. The thruster is operated in a high-current mode, where the anode discharge current is shown to oscillate quasi-periodically. A sample-hold scheme is implemented to correlate ion velocities to phases along the current cycle. These time-synchronized measurements show that median axial ion velocities decrease as discharge current increases, and that the widths of ion velocity distributions increase with increases in discharge current for positions at the exit plane and outside the thruster channel.

N A MacDonald; M A Cappelli; W A Hargus Jr

2014-01-01T23:59:59.000Z

37

Density waves in a transverse electric field  

Science Journals Connector (OSTI)

In a quasi-one-dimensional conductor with an open Fermi surface, a charge- or a spin-density-wave phase can be destroyed by an electric field perpendicular to the direction of high conductivity. This mechanism, due to the breakdown of electron-hole symmetry, is very similar to the orbital destruction of superconductivity by a magnetic field, due to time-reversal symmetry.

Gilles Montambaux

1996-12-15T23:59:59.000Z

38

Liquid Crystals in Electric Field Akira ONUKI  

E-Print Network [OSTI]

in an electric field. To treat such problems we need to construct a Ginzburg­Landau free energy including around a neutral colloid particle or emulsion droplet has been extensively studied,5,6) where the surface anchoring of a neutral particle can be achieved for a large radius because the penalty of the Frank free

39

Electric Field Imaging Joshua Reynolds Smith  

E-Print Network [OSTI]

Reynolds Smith Submitted to the Program in Media Arts and Sciences, School of Architecture and PlanningElectric Field Imaging by Joshua Reynolds Smith B.A., Williams College 1991 S.M., Massachusetts Institute of Technology 1995 M.A., University of Cambridge 1997 Submitted to the Program in Media Arts

Herr, Hugh

40

Electric Field and Humidity Trigger Contact Electrification  

E-Print Network [OSTI]

Here, we study the old problem of why identical insulators can charge one another on contact. We perform several experiments showing that, if driven by a preexisting electric field, charge is transferred between contacting insulators. This happens because the insulator surfaces adsorb small amounts of water from a humid atmosphere. We believe the electric field then separates positively from negatively charged ions prevailing within the water, which we believe to be hydronium and hydroxide ions, such that at the point of contact, positive ions of one insulator neutralize negative ions of the other one, charging both of them. This mechanism can explain for the first time the observation made four decades ago that wind-blown sand discharges in sparks if and only if a thunderstorm is nearby.

Zhang, Yanzhen; Liu, Yonghong; Wang, Xiaolong; Zhang, Rui; Shen, Yang; Ji, Renjie; Cai, Baoping

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "axial electric field" 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

Electric Field and Humidity Trigger Contact Electrification  

E-Print Network [OSTI]

Here, we study the old problem of why identical insulators can charge one another on contact. We perform several experiments showing that, if driven by a preexisting electric field, charge is transferred between contacting insulators. This happens because the insulator surfaces adsorb small amounts of water from a humid atmosphere. We believe the electric field then separates positively from negatively charged ions prevailing within the water, which we believe to be hydronium and hydroxide ions, such that at the point of contact, positive ions of one insulator neutralize negative ions of the other one, charging both of them. This mechanism can explain for the first time the observation made four decades ago that wind-blown sand discharges in sparks if and only if a thunderstorm is nearby.

Yanzhen Zhang; Thomas Pähtz; Yonghong Liu; Xiaolong Wang; Rui Zhang; Yang Shen; Renjie Ji; Baoping Cai

2015-01-14T23:59:59.000Z

42

Electric field shielding in dielectric nanosolutions  

E-Print Network [OSTI]

To gain some insight into electrochemical activity of dielectric colloids of technical and biomedical interest we investigate a model of dielectric nanosolution whose micro-constitution is dominated by dipolarions -- positively and negatively charged spherically symmetric nano-structures composed of ionic charge surrounded by cloud of radially polarized dipoles of electrically neutral molecules of solvent. Combing the standard constitutive equations of an isotropic dielectric liquid with Maxwell equation of electrostatics and presuming the Boltzmann shape of the particle density of bound-charge we derive equation for the in-medium electrostatic field. Particular attention is given to numerical analysis of obtained analytic solutions of this equation describing the exterior fields of dipolarions with dipolar atmospheres of solvent molecules endowed with either permanent or field-induced dipole moments radially polarized by central symmetric field of counterions. The presented computations show that the electric field shielding of dipolarions in dielectric nanosolutions is quite different from that of counterionic nano-complexes of Debye-H\\"uckel theory of electrolytes.

Sergey Bastrukov; Pik-Yin Lai; Irina Molodtsova

2014-03-26T23:59:59.000Z

43

Calculation of electric field and audible noise from transmission lines with non-parallel conductors  

SciTech Connect (OSTI)

In order to investigate the feasibility of using new transmission line configurations with non-parallel conductors, for managing magnetic field in critical areas, techniques are needed to assess the effects of different three-dimensional line arrangements on other important design parameters. A new method for calculation of electric field and corona-generated audible noise from non-parallel conductors is described and implemented as a computer tool. This method uses linearly varying line charges to simulate charge distribution along the axial direction of the transmission line. New algorithms are developed for calculating electric field and audible noise due to non-uniform line charges and illustrated by examples of low magnetic field transmission line designs.

Liu, Y. [Virginia Tech, Blacksburg, VA (United States)] [Virginia Tech, Blacksburg, VA (United States); Zaffanella, L.E. [Enertech Consultants, Lee, MA (United States)] [Enertech Consultants, Lee, MA (United States)

1996-07-01T23:59:59.000Z

44

National High Magnetic Field Laboratory: Museum of Electricity...  

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

chemistry. Related Electricity & Magnetism Pages Interactive Java Tutorials: Magnetic Field Lines Around a Wire Interactive Java Tutorials: Magnetic Field Lines Around a Wire, II...

45

National High Magnetic Field Laboratory: Museum of Electricity...  

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

strength of a magnetic field. He also made significant contributions to our understanding of the Earth's magnetic field. Related Electricity & Magnetism Pages Timeline: 1830 - 18...

46

National High Magnetic Field Laboratory: Museum of Electricity...  

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

of the Earths magnetic field to the research community. Related Electricity & Magnetism Pages Interactive Java Tutorials: Compasses in Magnetic Fields Interactive Java...

47

2.6 ELECTRIC AND MAGNETIC FIELDS Introduction  

E-Print Network [OSTI]

325 §2.6 ELECTRIC AND MAGNETIC FIELDS Introduction In electromagnetic theory the mks system MKS units Replacement symbol GAUSSIAN units E (Electric field) volt/m E statvolt/cm B (Magnetic field gauss-cm V (Electric potential) volt V statvolt (Dielectric constant) 4 µ (Magnetic permeability) 4µ c2

California at Santa Cruz, University of

48

Planned waveguide electric field breakdown studies  

SciTech Connect (OSTI)

This paper presents an experimental setup for X-band rf breakdown studies. The setup is composed of a section of WR90 waveguide with a tapered pin located at the middle of the waveguide E-plane. Another pin is used to rf match the waveguide so it operates in a travelling wave mode. By adjusting the penetration depth of the tapered pin, different surface electric field enhancements can be obtained. The setup will be used to study the rf breakdown rate dependence on power flow in the waveguide for a constant maximum surface electric field on the pin. Two groups of pins have been designed. The Q of one group is different and very low. The other has a similar Q. With the test of the two groups of pins, we should be able to discern how the net power flow and Q affect the breakdown. Furthermore, we will apply an electron beam treatment to the pins to study its effect on breakdown. Overall, these experiments should be very helpful in understanding rf breakdown phenomena and could significantly benefit the design of high gradient accelerator structures.

Wang Faya; Li Zenghai [SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025 (United States)

2012-12-21T23:59:59.000Z

49

Two-dimensional simulations of thermonuclear burn in ignition-scale inertial confinement fusion targets under compressed axial magnetic fields  

SciTech Connect (OSTI)

We report for the first time on full 2-D radiation-hydrodynamic implosion simulations that explore the impact of highly compressed imposed magnetic fields on the ignition and burn of perturbed spherical implosions of ignition-scale cryogenic capsules. Using perturbations that highly convolute the cold fuel boundary of the hotspot and prevent ignition without applied fields, we impose initial axial seed fields of 20–100 T (potentially attainable using present experimental methods) that compress to greater than 4 × 10{sup 4} T (400 MG) under implosion, thereby relaxing hotspot areal densities and pressures required for ignition and propagating burn by ?50%. The compressed field is high enough to suppress transverse electron heat conduction, and to allow alphas to couple energy into the hotspot even when highly deformed by large low-mode amplitudes. This might permit the recovery of ignition, or at least significant alpha particle heating, in submarginal capsules that would otherwise fail because of adverse hydrodynamic instabilities.

Perkins, L. J.; Logan, B. G.; Zimmerman, G. B.; Werner, C. J. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)] [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

2013-07-15T23:59:59.000Z

50

2.6 ELECTRIC AND MAGNETIC FIELDS Introduction  

E-Print Network [OSTI]

325 §2.6 ELECTRIC AND MAGNETIC FIELDS Introduction In electromagnetic theory the mks system MKS units Replacement symbol GAUSSIAN units # E (Electric field) volt/m # E statvolt/cm # B (Magnetic potential) weber/m # A c gauss­cm V (Electric potential) volt V statvolt # (Dielectric constant) # 4# µ

California at Santa Cruz, University of

51

DIVERSION OF ADULT SALMON BY AN ELECTRICAL FIELD  

E-Print Network [OSTI]

DIVERSION OF ADULT SALMON BY AN ELECTRICAL FIELD Marine Biological Laboratory : -1958 WOODS HOLE OF ADULT SALMON BY AN ELECTRICAL FIELD By Roger E. Burrows Fishery Research Biologist Entiat, Wash. Bureau 1957 #12;ABSTRACT An electrical weir consisting of a line of hanging electrodes and a submerged ground

52

TWO FREEDERICKSZ TRANSITIONS IN CROSSED ELECTRIC AND MAGNETIC FIELDS  

E-Print Network [OSTI]

965 TWO FREEDERICKSZ TRANSITIONS IN CROSSED ELECTRIC AND MAGNETIC FIELDS H. J. DEULING-p-dibu- tylazoxybenzène. Abstract. 2014 A planar nematic slab shows a Freedericksz transition in a perpendicular electric by external electric or magnetic fields. The resulting distortion is governed by a balance of stabilizing

Boyer, Edmond

53

Electric Field Structures in Thin Films: Formation and Properties  

Science Journals Connector (OSTI)

These yield a variety of tailored electric field structures, with individual layers harboring fields between 107 and 108 V/m. ... Materials which produce and harbor electric (and magnetic) fields, and the layering of such materials to produce composite multiferroic heterostructures, stimulate great interest in the physicochemical and material science communities. ... One may note that the data for toluene in Figure 1b do not form precisely parallel lines and therefore do not represent the same electric field. ...

Andrew Cassidy; Oksana Plekan; Richard Balog; Jack Dunger; David Field; Nykola C. Jones

2014-06-12T23:59:59.000Z

54

National High Magnetic Field Laboratory: Museum of Electricity...  

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

navigate the seas, effectively changing the course of history. Related Electricity & Magnetism Pages Museum: Lodestone Timeline: 600 1599 Tutorial: Compasses in Magnetic Fields...

55

National High Magnetic Field Laboratory: Museum of Electricity...  

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

high-tech field, gradually being replaced by semiconductors. Related Electricity & Magnetism Pages Magnetic Core Memory: Interactive Java Tutorial Magnetic core memory was...

56

Electric field effects in liquid crystals with dielectric dispersion  

SciTech Connect (OSTI)

The project is focused on the experimental and theoretical exploration of the coupling of an externally applied electric field and a nematic liquid crystal.

Lavrentovich, Oleg D. [Kent State University

2014-11-29T23:59:59.000Z

57

Thermal bubble behaviour in liquid nitrogen under electric fields.  

E-Print Network [OSTI]

??This thesis describes thermally induced bubble behaviour changes in liquid nitrogen (LN2) under electric fields. Cryogenic liquids such as LN2 have been used not only… (more)

Wang, Ping

2008-01-01T23:59:59.000Z

58

Axial magnetic field and toroidally streaming fast ions in the dense plasma focus are natural consequences of conservation laws in the curved axisymmetric geometry of the current sheath  

E-Print Network [OSTI]

Direct measurement of axial magnetic field in the PF-1000 dense plasma focus (DPF), and its reported correlation with neutron emission, call for a fresh look at previous reports of existence of axial magnetic field component in the DPF from other laboratories, and associated data suggesting toroidal directionality of fast ions participating in fusion reactions, with a view to understand the underlying physics. In this context, recent work dealing with application of the hyperbolic conservation law formalism to the DPF is extended in this paper to a curvilinear coordinate system, which reflects the shape of the DPF current sheath. Locally-unidirectional shock propagation in this coordinate system enables construction of a system of 7 one-dimensional hyperbolic conservation law equations with geometric source terms, taking into account all the components of magnetic field and flow velocity. Rankine-Hugoniot jump conditions for this system lead to expressions for the axial magnetic field and three components of ...

Auluck, S K H

2014-01-01T23:59:59.000Z

59

Vector optical fields with polarization distributions similar to electric and magnetic field lines  

Science Journals Connector (OSTI)

We present, design and generate a new kind of vector optical fields with linear polarization distributions modeling to electric and magnetic field lines. The geometric configurations...

Pan, Yue; Li, Si-Min; Mao, Lei; Kong, Ling-Jun; Li, Yongnan; Tu, Chenghou; Wang, Pei; Wang, Hui-Tian

2013-01-01T23:59:59.000Z

60

Effect of an electric field on brucite dehydroxylation  

Science Journals Connector (OSTI)

The dehydroxylation of brucite has been investigated in electric fields up...T=623 K. It is revealed that this reaction in the presence and absence of the field is a diffusion-controlled process, and its rate is ...

E. A. Kalinichenko; A. S. Litovchenko

2000-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "axial electric field" 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

Biological Effects of Electrical and Magnetic Fields: Is It Real?  

E-Print Network [OSTI]

The hazardous effect of electric and magnetic fields on biological systems is the subject of considerable debate. Traditional methods have failed to provide a correlation between the fields and biological effects. A model is presented that solves...

Durham, M. O.

62

Transport Analysis of Radial Electric Field in Helical Plasmas  

E-Print Network [OSTI]

condition for the neoclassical particle ux. The generation of the electric #12;eld in helical systems could in generating the radial electric #12;eld [8, 9]. We have used the transport model for anomalous di#11;usivitiesTransport Analysis of Radial Electric Field in Helical Plasmas S. Toda and K. Itoh National

63

Electric field induced spin wave generation for beyond CMOS magnonic logic devices  

E-Print Network [OSTI]

OF CALIFORNIA Los Angeles Electric field induced spin waveNath ABSTRACT OF THE THESIS Electric field induced spin wavestrain mediated magneto electric effect. We have conducted

Nath, Jayshankar

2012-01-01T23:59:59.000Z

64

Decoherence and coherence in gravitational, electric and strong nuclear fields  

E-Print Network [OSTI]

Inspired in the work of Erich Joos which appreciated the role played by matter in making the decoherence of the gravitational field, we developed an alternative way of treating the former problem. Besides this, we used the alternative approach to examine the decoherence of the electric field performed by the conduction electrons in metals. As a counterpoint, we studied the coherence of the electric color field inside nucleons, which renders the strong field a totally quantum character.

P. R. Silva

2010-10-25T23:59:59.000Z

65

Disruption of Cancer Cell Replication by Alternating Electric Fields  

Science Journals Connector (OSTI)

...fields (7 , 8) . A fundamental characteristic of electric...the direction of the force they exert on charges...simulation of the lines of force of the electric field...between the lines of force). In contrast, in...biomedical engineering handbook, p. 1404-16, CRC...

Eilon D. Kirson; Zoya Gurvich; Rosa Schneiderman; Erez Dekel; Aviran Itzhaki; Yoram Wasserman; Rachel Schatzberger; and Yoram Palti

2004-05-01T23:59:59.000Z

66

Radial electric field 3D modeling for wire arrays driving dynamic hohlraums on Z.  

SciTech Connect (OSTI)

The anode-cathode structure of the Z-machine wire array results in a higher negative radial electric field (Er) on the wires near the cathode relative to the anode. The magnitude of this field has been shown to anti-correlate with the axial radiation top/bottom symmetry in the DH (Dynamic Hohlraum). Using 3D modeling, the structure of this field is revealed for different wire-array configurations and for progressive mechanical alterations, providing insight for minimizing the negative Er on the wire array in the anode-to-cathode region of the DH. Also, the 3D model is compared to Sasorov's approximation, which describes Er at the surface of the wire in terms of wire-array parameters.

Mock, Raymond Cecil

2007-06-01T23:59:59.000Z

67

E-Print Network 3.0 - axial crystal fields Sample Search Results  

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

Following up on our previous work on 2nd generation flat tape... technology would be the Holy Grail", J. Schwartz of the National High Field Magnet Laboratory, ... Source: van...

68

Effect of Electric and Magnetic Fields on Spin Dynamics in the Resonant Electric Dipole Moment Experiment  

E-Print Network [OSTI]

A buildup of the vertical polarization in the resonant electric dipole moment (EDM) experiment [Y. F. Orlov, W. M. Morse, and Y. K. Semertzidis, Phys. Rev. Lett. 96, 214802 (2006)] is affected by a horizontal electric field in the particle rest frame oscillating at a resonant frequency. This field is defined by the Lorentz transformation of an oscillating longitudinal electric field and a uniform vertical magnetic one. The effect of a longitudinal electric field is significant, while the contribution from a magnetic field caused by forced coherent longitudinal oscillations of particles is dominant. The effect of electric field on the spin dynamics was not taken into account in previous calculations. This effect is considerable and leads to decreasing the EDM effect for the deuteron and increasing it for the proton. The formula for resonance strengths in the EDM experiment has been derived. The spin dynamics has been calculated.

Alexander J. Silenko

2007-10-02T23:59:59.000Z

69

A Dynamic Model of Thundercloud Electric Fields  

Science Journals Connector (OSTI)

A dynamic interactive computer model of the electrical behavior of a thundercloud surrounded by the distributed atmosphere, earth, ionosphere circuit is described. The electrification mechanisms in the model are represented by current or voltage ...

John S. Nisbet

1983-12-01T23:59:59.000Z

70

Electric field in 3D gravity with torsion  

E-Print Network [OSTI]

It is shown that in static and spherically symmetric configurations of the system of Maxwell field coupled to 3D gravity with torsion, at least one of the Maxwell field components has to vanish. Restricting our attention to the electric sector of the theory, we find an interesting exact solution, corresponding to the azimuthal electric field. Its geometric structure is to a large extent influenced by the values of two different central charges, associated to the asymptotic AdS structure of spacetime.

M. Blagojevi?; B. Cvetkovi?

2008-09-01T23:59:59.000Z

71

Independent Manipulation of Electric and Thermal Fields with Bilayer Structure  

E-Print Network [OSTI]

Recently, increasing attention has been focused on the employment of transformation and metamaterial for manipulation of various physical fields, which requires complicated configuration and usually limits in single field. Here, for the first time, we propose and experimentally demonstrated bilayer structure to achieve simultaneously independent manipulation of multi-physics field (dc electric fields and thermal) by directly solving the dc electric/ thermal field equations. This structure is composed of two layers: the outer layer is made of isotropic and homogeneous material, while the inner layer is fan-shape layer. Since it is not based on TO, it can be readily experimentally fabricated with naturally occurring materials. Experimentally, we has designed, fabricated and characterized two structures simultaneously behaving as dc electric cloak/ thermal concentrator and dc electric concentrator/ thermal cloak, respectively. The simulation results agree well with the experiment ones, thus confirming the feasib...

Lan, Chuwen; Wu, Lingling; Li, Bo; Zhou, Ji

2015-01-01T23:59:59.000Z

72

Edge Radial Electric Field on Alcator C-Mod  

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

Edge Radial Electric Field on Alcator C-Mod Edge Radial Electric Field on Alcator C-Mod R. M. McDermott 1 , B. Lipschultz 1 , K. Marr 1 , I. Bespamyatnov 2 , J. W. Hughes 1 , W. Rowan 2, , D. Whyte 1 1 Plasma Science and Fusion Center, MIT, Cambridge, MA, USA 2 Fusion Research Center, University of Texas, Austin Texas, USA Edge CXRS System on Alcator C-Mod E r in L-Mode Plasmas Calculation of the Radial Electric Field C G D Edge Poloidal System:

73

Spin diffusion at finite electric and magnetic fields  

Science Journals Connector (OSTI)

Spin-transport properties at finite electric and magnetic fields are studied by using the generalized semiclassical Boltzmann equation. It is found that the spin-diffusion equation for nonequilibrium spin density and spin currents involves a number of length scales that explicitly depend on the electric and magnetic fields. The set of macroscopic equations can be used to address a broad range of the spin-transport problems in magnetic multilayers as well as in semiconductor heterostructure. A specific example of spin injection into semiconductors at arbitrary electric and magnetic fields is illustrated.

Y. Qi and S. Zhang

2003-02-27T23:59:59.000Z

74

Electric Field Control of Local Ferromagnetism with a Magnetoelectric  

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

Electric Field Control of Local Ferromagnetism with a Magnetoelectric Multiferroic Print Electric Field Control of Local Ferromagnetism with a Magnetoelectric Multiferroic Print Magnetoelectric multiferroics-materials that simultaneously show some form of magnetic and ferroelectric order-have excited condensed-matter researchers worldwide with the promise of coupling between magnetic and electric order parameters. A Berkeley-Stanford-Swiss group has now used the multiferroic bismuth-iron-oxygen compound BiFeO3 (BFO) to explore electrical control of magnetism through exchange coupling with a ferromagnet. Their experiments reveal the possibility of controlling ferromagnetism with an electric field at room temperature, a capability that could result in new and novel devices for magnetic data storage, spintronics, and high-frequency magnetic devices.

75

Electric Field Control of Local Ferromagnetism with a Magnetoelectric  

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

Electric Field Control of Local Ferromagnetism with a Magnetoelectric Multiferroic Print Electric Field Control of Local Ferromagnetism with a Magnetoelectric Multiferroic Print Magnetoelectric multiferroics-materials that simultaneously show some form of magnetic and ferroelectric order-have excited condensed-matter researchers worldwide with the promise of coupling between magnetic and electric order parameters. A Berkeley-Stanford-Swiss group has now used the multiferroic bismuth-iron-oxygen compound BiFeO3 (BFO) to explore electrical control of magnetism through exchange coupling with a ferromagnet. Their experiments reveal the possibility of controlling ferromagnetism with an electric field at room temperature, a capability that could result in new and novel devices for magnetic data storage, spintronics, and high-frequency magnetic devices.

76

Electric Field Control of Local Ferromagnetism with a Magnetoelectric  

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

Electric Field Control of Local Ferromagnetism with a Magnetoelectric Multiferroic Print Electric Field Control of Local Ferromagnetism with a Magnetoelectric Multiferroic Print Magnetoelectric multiferroics-materials that simultaneously show some form of magnetic and ferroelectric order-have excited condensed-matter researchers worldwide with the promise of coupling between magnetic and electric order parameters. A Berkeley-Stanford-Swiss group has now used the multiferroic bismuth-iron-oxygen compound BiFeO3 (BFO) to explore electrical control of magnetism through exchange coupling with a ferromagnet. Their experiments reveal the possibility of controlling ferromagnetism with an electric field at room temperature, a capability that could result in new and novel devices for magnetic data storage, spintronics, and high-frequency magnetic devices.

77

Electric Field Control of Local Ferromagnetism with a Magnetoelectric  

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

Electric Field Control of Local Ferromagnetism with a Magnetoelectric Multiferroic Print Electric Field Control of Local Ferromagnetism with a Magnetoelectric Multiferroic Print Magnetoelectric multiferroics-materials that simultaneously show some form of magnetic and ferroelectric order-have excited condensed-matter researchers worldwide with the promise of coupling between magnetic and electric order parameters. A Berkeley-Stanford-Swiss group has now used the multiferroic bismuth-iron-oxygen compound BiFeO3 (BFO) to explore electrical control of magnetism through exchange coupling with a ferromagnet. Their experiments reveal the possibility of controlling ferromagnetism with an electric field at room temperature, a capability that could result in new and novel devices for magnetic data storage, spintronics, and high-frequency magnetic devices.

78

Strong Axiality and Ising Exchange Interaction Suppress Zero-Field Tunneling of Magnetization of an Asymmetric Dy2 Single-Molecule Magnet  

Science Journals Connector (OSTI)

Strong Axiality and Ising Exchange Interaction Suppress Zero-Field Tunneling of Magnetization of an Asymmetric Dy2 Single-Molecule Magnet ... The high axiality and Ising exchange interaction efficiently suppress quantum tunneling of magnetization of an asymmetric dinuclear DyIII complex, as revealed by combined experimental and theoretical investigations. ... With the obtained parameters J and zJ, the spectrum of the lowest exchange multiplets is found to be two exchange Ising doublets (Table S4), separated by 2.85 cm–1, each showing a tunneling splitting of the order of 10–8 cm–1 (Figure 4c). ...

Yun-Nan Guo; Gong-Feng Xu; Wolfgang Wernsdorfer; Liviu Ungur; Yang Guo; Jinkui Tang; Hong-Jie Zhang; Liviu F. Chibotaru; Annie K. Powell

2011-07-11T23:59:59.000Z

79

Effective critical electric field for runaway electron generation  

E-Print Network [OSTI]

In this letter we investigate factors that influence the effective critical electric field for runaway electron generation in plasmas. We present numerical solutions of the kinetic equation, and discuss the implications for the threshold electric field. We show that the effective electric field necessary for significant runaway formation often is higher than previously calculated due to both (1) extremely strong dependence of primary generation on temperature, and (2) synchrotron radiation losses. We also address the effective critical field in the context of a transition from runaway growth to decay. We find agreement with recent experiments, but show that the observation of an elevated effective critical field can mainly be attributed to changes in the momentum-space distribution of runaways, and only to a lesser extent to a de facto change in the critical field.

Stahl, Adam; Decker, Joan; Embréus, Ola; Fülöp, Tünde

2014-01-01T23:59:59.000Z

80

Linear Electric Field Time-Of-Flight Ion Mass Spectrometers  

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

Linear Electric Field Time-Of-Flight Ion Mass Spectrometers Linear Electric Field Time-Of-Flight Ion Mass Spectrometers Linear Electric Field Time-Of-Flight Ion Mass Spectrometers Time-of-flight mass spectrometer comprising a first drift region and a second drift region enclosed within an evacuation chamber. Available for thumbnail of Feynman Center (505) 665-9090 Email Linear Electric Field Time-Of-Flight Ion Mass Spectrometers Time-of-flight mass spectrometer comprising a first drift region and a second drift region enclosed within an evacuation chamber; a means of introducing an analyte of interest into the first drift region; a pulsed ionization source which produces molecular ions from said analyte of interest; a first foil positioned between the first drift region and the second drift region, which dissociates said molecular ions into constituent

Note: This page contains sample records for the topic "axial electric field" 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

Electric-field-induced spin depolarization in graphene quantum dots  

Science Journals Connector (OSTI)

We study the effect of the in-plane electric field on the magnetic properties of charge-neutral triangular zigzag graphene quantum dot (GQD) by using the mean-field Hubbard Hamiltonian. Our calculated results show that spin depolarization begins to occur when the electric field is beyond some critical value. The spin-density distribution is more concentrated in the region of the GQDs with smaller electrostatic potential. This phenomenon is attributed to the competition between the many-body electron-electron interaction and the external electrostatic potential. Numerical results also show that the total spin of larger GQDs are easier to depolarize than the total spin of smaller GQDs. Moreover, the spin of GQDs with weak edge disorder still respond to an electric field but in a more irregular way. Our findings provide a path to electrically tuning the magnetic properties of GQDs.

Wen-Long Ma and Shu-Shen Li

2012-07-30T23:59:59.000Z

82

Finite Element Studies of Colloidal Mixtures Influenced by Electric Fields  

E-Print Network [OSTI]

A further understanding of colloidal mixture behavior under applied electric fields would greatly benefit the design of smart material systems such as electrorheological fluidic devices and microfluidic reconfigurable antennas. This thesis presents...

Drummond, Franklin Jerrel

2011-10-21T23:59:59.000Z

83

Generation of Dielectrophoretic Force under Uniform Electric Field  

E-Print Network [OSTI]

Effective dipole moment method has been widely accepted as the de facto technique in predicting the dielectrophoretic force due to the non-uniform electric field. In this method, a finite-particle is modeled as an equivalent ...

Kua, C.H.

84

Bubbles in Insulating Liquids: Stability in an Electric Field  

Science Journals Connector (OSTI)

...July 1964 research-article Bubbles in Insulating Liquids: Stability in an Electric Field C. G...Krasucki It is shown that a bubble of gas or liquid, immersed...of incompressible (liquid) bubbles immersed in an insulating liquid...

1964-01-01T23:59:59.000Z

85

Zigzag nanoribbons in external electric and magnetic fields  

Science Journals Connector (OSTI)

We consider the Schrodinger operators on zigzag nanoribbons (tight-binding models) in external magnetic and electric fields. If these fields are absent, then the spectrum of the Schrodinger operator consists of two non-flat bands and one flat band (an eigenvalue with infinite multiplicity) between them. We describe all magnetic and electric fields for which the unperturbed flat band remains the flat band and when one splits into the small band of the continuous spectrum. Also we determine spectral asymptotics for small fields and solve inverse spectral problem.

Evgeny L. Korotyaev; Anton A. Kutsenko

2010-01-01T23:59:59.000Z

86

Report on Non-Contact DC Electric Field Sensors  

SciTech Connect (OSTI)

This document reports on methods used to measure DC electrostatic fields in the range of 100 to 4000 V/m using a non-contact method. The project for which this report is written requires this capability. Non-contact measurements of DC fields is complicated by the effect of the accumulation of random space-charges near the sensors which interfere with the measurement of the field-of-interest and consequently, many forms of field measurements are either limited to AC measurements or use oscillating devices to create pseudo-AC fields. The intent of this document is to report on methods discussed in the literature for non-contact measurement of DC fields. Electric field meters report either the electric field expressed in volts per distance or the voltage measured with respect to a ground reference. Common commercial applications for measuring static (DC) electric fields include measurement of surface charge on materials near electronic equipment to prevent arcing which can destroy sensitive electronic components, measurement of the potential for lightning to strike buildings or other exposed assets, measurement of the electric fields under power lines to investigate potential health risks from exposure to EM fields and measurement of fields emanating from the brain for brain diagnostic purposes. Companies that make electric field sensors include Trek (Medina, NY), MKS Instruments, Boltek, Campbell Systems, Mission Instruments, Monroe Electronics, AlphaLab, Inc. and others. In addition to commercial vendors, there are research activities continuing in the MEMS and optical arenas to make compact devices using the principles applied to the larger commercial sensors.

Miles, R; Bond, T; Meyer, G

2009-06-16T23:59:59.000Z

87

Electrical properties of chain microstructure magnetic emulsions in magnetic field  

E-Print Network [OSTI]

The work deals with the experimental study of the emulsion whose dispersion medium is a magnetic fluid while the disperse phase is formed by a glycerin-water mixture. It is demonstrated that under effect of a magnetic field chain aggregates form from the disperse phase drops. Such emulsion microstructure change affects its macroscopic properties. The emulsion dielectric permeability and specific electrical conductivity have been measured. It is demonstrated that under the effect of relatively weak external magnetic fields (~ 1 kA/m) the emulsion electrical parameters may change several fold. The work theoretically analyzes the discovered regularities of the emulsion electrical properties.

Arthur Zakinyan; Yuri Dikansky; Marita Bedzhanyan

2014-02-05T23:59:59.000Z

88

Ways to calculate electric fields in traction electric motor insulation by equivalent charge method  

Science Journals Connector (OSTI)

A procedure permitting one to calculate the electric fields in multilayer insulation based on the equivalent charge method is presented. Consideration of the new algorithm shows its fast response and proper ac...

A. V. Kireev; A. Yu. Bakhvalov; S. Yu. Knyazev…

2009-03-01T23:59:59.000Z

89

Solitons in photovoltaic photorefractive media with an external electric field  

Science Journals Connector (OSTI)

We use the classical Lie-group method for studying the evolution equation in photovoltaic photorefractive media with an external electric field, reducing it to some similarity equations firstly, and then obtain some exact analytical solutions including the soliton solution, the period solution and the oscillatory solution. We also obtain the bright soliton, dark soliton, gray soliton from these similarity equations with the numerical method. Furthermore, we investigate what factors contribute to the beamwidth of these solitons with the numerical method and know the beamwidth of these solitons are associated with the external electric field, the photovoltaic field and the intensity ratio of the incident soliton.

Hou Wang; Ji Lin

2011-01-01T23:59:59.000Z

90

Polyelectrolytes polarization in non-uniform electric fields  

E-Print Network [OSTI]

Stretching dynamics of polymers in microfluidics is of particular interest for polymer scientists. As a charged polymer, a polyelectrolyte can be deformed from its coiled equilibrium configuration to an extended chain by applying uniform or non-uniform electric fields. By means of hybrid lattice Boltzmann-molecular dynamics simulations, we investigate how the condensed counterions around the polyelectrolyte contribute to the polymer stretching in inhomogeneous fields. As an application, we discuss the translocation phenomena and entropic traps, when the driving force is an applied external electric field.

Farnoush Farahpour; Fathollah Varnik; Mohammad Reza Ejtehadi

2014-11-16T23:59:59.000Z

91

EMDEX (Electric and Magnetic Field Digital EXposure) system manuals  

SciTech Connect (OSTI)

The EPRI Electric and Magnetic Field Digital EXposure (EMDEX) system consists of hardware and software for characterizing electric and magnetic field exposures. The EMDEX meter is a computer-based portable unit that samples, at a user-programmable rate, the three vector components of magnetic flux density, a measure of the average electric field acting on the torso of the wearer (if an optional sensor is worn) and a measure of rotational motion of the meter in the earth's magnetic field. Modules of the DATACALC software package are used to program the EMDEX, retrieve data at the end of a measurement session, analyze EMDEX data, and prepare tabular and graphical data summaries. The User Manual is designed to provide instruction on the use of the exposure system hardware and software. The Technical Reference Manual provides additional, detailed descriptions of the hardware, software and methodologies used in the EMDEX system.

Not Available

1989-10-01T23:59:59.000Z

92

PHYSICAL REVIEW E 88, 022127 (2013) Dynamics of an electric dipole moment in a stochastic electric field  

E-Print Network [OSTI]

PHYSICAL REVIEW E 88, 022127 (2013) Dynamics of an electric dipole moment in a stochastic electric 2013; published 15 August 2013) The mean-field dynamics of an electric dipole moment in a deterministic and a fluctuating electric field is solved to obtain the average over fluctuations of the dipole moment

Band, Yehuda B.

93

High School Students' Understandings and Representations of the Electric Field  

E-Print Network [OSTI]

This study investigates the understandings and representations of the electric field expressed by Chinese high school students ages 15 to 16 who have not yet received high school-level physics instruction. The literature has reported students' ideas of the electric field post-instruction as indicated by their performance on textbook-style questionnaires. However, by relying on measures such as questionnaires, previous research has inadequately captured the thinking process that led students to answer questions in the ways that they did. The present study portrays the beginning of this process by closely examining students' understandings pre-instruction. The participants in this study were asked to engage in a lesson that included informal group tasks that involved playing a Web-based hockey game that replicated an electric field and drawing comic strips that used charges as characters. The lesson was videotaped, students' work was collected, and three students were interviewed afterward to ascertain more det...

Cao, Ying

2014-01-01T23:59:59.000Z

94

Strong electric fields from positive lightning strokes in the stratosphere R. H. Holzworth,1  

E-Print Network [OSTI]

Strong electric fields from positive lightning strokes in the stratosphere R. H. Holzworth,1 M. P] A balloon payload launched in Brazil has measured vector electric fields from lightning at least an order of the electric field transient propagation. These measurements imply that lightning electric fields

Thomas, Jeremy N.

95

Control of the electric-field profile in the Hall thruster A. Fruchtman  

E-Print Network [OSTI]

electric field. This ability to generate a large electric field at a specific location along the channelControl of the electric-field profile in the Hall thruster A. Fruchtman Holon Academic Institute; accepted 27 November 2000 Control of the electric-field profile in the Hall thruster through

96

The Breakdown of Gases in High Frequency Electrical Fields  

Science Journals Connector (OSTI)

A theory is proposed to explain the mechanism of breakdown of gases in high frequency electrical fields. It is assumed that breakdown occurs when the electrical field and the frequency are such that an electron acquires the ionizing energy at the end of one mean free path. The field for breakdown is thus a function of the frequency of the applied potential and the ionization potential and pressure of the gas. The fields for breakdown of argon and xenon are calculated and expressed as functions of the frequency and the gas pressure. The calculated potentials are compared with experimental data, and good agreement is found for frequencies greater than 10×106 c.p.s.

Donald H. Hale

1948-05-01T23:59:59.000Z

97

MICROSECOND-SCALE ELECTRIC FIELD PULSES IN CLOUD LIGHTNING FLASHES  

E-Print Network [OSTI]

-149- 30F3 MICROSECOND-SCALE ELECTRIC FIELD PULSES IN CLOUD LIGHTNING FLASHES Y. Villanueva, V tape-recorded data) for ground flashes by Rakov et al. [5]. Note that the K process in a lightning-scale pulses in different stages of cloud flashes in Florida and New Mexico are analyzed. The pulse occurrence

Florida, University of

98

Dynamic behaviour of electric arc gas discharge  

Science Journals Connector (OSTI)

The time-dependent energy and circuit equations are solved numerically to obtain temperature profiles, current-voltage characteristics and electric field strength vs axial temperature diagrams in the asymptoti...

J. Jeništa

1994-01-01T23:59:59.000Z

99

Adsorbate Electric Fields on a Cryogenic Atom Chip  

E-Print Network [OSTI]

We investigate the behaviour of electric fields originating from adsorbates deposited on a cryogenic atom chip as it is cooled from room temperature to cryogenic temperature. Using Rydberg electromagnetically induced transparency we measure the field strength versus distance from a 1 mm square of YBCO patterned onto a YSZ chip substrate. We find a localized and stable dipole field at room temperature and attribute it to a saturated layer of chemically adsorbed rubidium atoms on the YBCO. As the chip is cooled towards 83 K we observe a change in sign of the electric field as well as a transition from a localized to a delocalized dipole density. We relate these changes to the onset of physisorption on the chip surface when the van der Waals attraction overcomes the thermal desorption mechanisms. Our findings suggest that, through careful selection of substrate materials, it may be possible to reduce the electric fields caused by atomic adsorption on chips, opening up experiments to controlled Rydberg-surface co...

Chan, K S; Hufnagel, C; Dumke, R

2013-01-01T23:59:59.000Z

100

Estimating of pulsed electric fields using optical measurements.  

SciTech Connect (OSTI)

We performed optical electric field measurements ion nanosecond time scales using the electrooptic crystal beta barium borate (BBO). Tests were based on a preliminary bench top design intended to be a proofofprinciple stepping stone towards a modulardesign optical Efield diagnostic that has no metal in the interrogated environment. The long term goal is to field a modular version of the diagnostic in experiments on large scale xray source facilities, or similarly harsh environments.

Flanagan, Timothy McGuire; Chantler, Gary R.

2013-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "axial electric field" 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

Electric-field-driven polymer entry into asymmetric nanoscale channels  

E-Print Network [OSTI]

The electric-field-driven entry process of flexible charged polymers such as single stranded DNA (ssDNA) into asymmetric nanoscale channels such as alpha-hemolysin protein channel is studied theoretically and using molecular dynamics simulations. Dependence of the height of the free-energy barrier on the polymer length, the strength of the applied electric field and the channel entrance geometry is investigated. It is shown that the squeezing effect of the driving field on the polymer and the lateral confinement of the polymer before its entry to the channel crucially affect the barrier height and its dependence on the system parameters. The attempt frequency of the polymer for passing the channel is also discussed. Our theoretical and simulation results support each other and describe related data sets of polymer translocation experiments through the alpha-hemolysin protein channel reasonably well.

Narges Nikoofard; Hossein Fazli

2012-02-25T23:59:59.000Z

102

Electric Field effects on quantum correlations in semiconductor quantum dots  

E-Print Network [OSTI]

We study the effect of external electric bias on the quantum correlations in the array of optically excited coupled semiconductor quantum dots. The correlations are characterized by the quantum discord and concurrence and are observed using excitonic qubits. We employ the lower bound of concurrence for thermal density matrix at different temperatures. The effect of the F\\"orster interaction on correlations will be studied. Our theoretical model detects nonvanishing quantum discord when the electric field is on while concurrence dies, ensuring the existence of nonclassical correlations as measured by the quantum discord.

S. Shojaei; M. Mahdian; R. Yousefjani

2012-05-01T23:59:59.000Z

103

Electric Field How does a charge, q1, exert a force on  

E-Print Network [OSTI]

Electric Field How does a charge, q1, exert a force on another charge, q2, when the charges don't touch? The charge, q1, sets up an electric field in its surrounding space This electric field has both magnitude and direction which determine the magnitude and direction of the force acting on q2 #12;Electric

Bertulani, Carlos A. - Department of Physics and Astronomy, Texas A&M University

104

Influence of the pulsating electric field on the ECR heating in a nonuniform magnetic field  

SciTech Connect (OSTI)

According to a computer simulation, the randomized pulsating electric field can strongly influence the ECR plasma heating in a nonuniform magnetic field. It has been found out that the electron energy spectrum is shifted to the high energy region. The obtained effect is intended to be used in the ECR sources for effective X-ray generation.

Balmashnov, A. A., E-mail: abalmashnov@sci.pfu.edu.ru; Umnov, A. M. [People's Friendship University of Russia (Russian Federation)

2011-12-15T23:59:59.000Z

105

AC field exposure study: human exposure to 60-Hz electric fields  

SciTech Connect (OSTI)

The objective of this study was to develop a method of estimating human exposure to the 60 Hz electric fields created by transmission lines. The Activity Systems Model simulates human activities in a variety of situations where exposure to electric fields is possible. The model combines maps of electric fields, activity maps, and experimentally determined activity factors to provide histograms of time spent in electric fields of various strengths in the course of agricultural, recreational, and domestic activities. For corroboration, the study team measured actual human exposure at locations across the United States near transmission lines ranging in voltage from 115 to 1200 kV. The data were collected with a specially designed vest that measures exposure. These data demonstrate the accuracy of the exposure model presented in this report and revealed that most exposure time is spent in fields of magnitudes similar to many household situations. The report provides annual exposure estimates for human activities near transmission lines and in the home and compares them with exposure data from typical laboratory animal experiments. For one exposure index, the cumulative product of time and electric field, exposure during some of the laboratory animal experiments is two to four orders of magnitude greater than cumulative exposure for a human during one year of outdoor work on a farm crossed by a transmission line.

Silva, J.M.

1985-04-01T23:59:59.000Z

106

Generation of electromagnetic radiation based on nanotubes under a constant electric field and an electromagnetic wave field  

SciTech Connect (OSTI)

The possible generation of radiation in the millimeter range based on nanotubes by an alternating (rapidly oscillating) electric field under a constant (or nonstationary) electric field is studied. Radiation enhancement is based on a periodic dependence of the current in nanotubes in such electric fields. The results of a mathematical simulation are presented.

Sadykov, N. R., E-mail: sadykov@rambler.ru; Scorkin, N. A. [South Ural State University (Russian Federation)

2012-02-15T23:59:59.000Z

107

Piezoelectric & Optical Set-up to measure an Electrical Field. Application to the Longitudinal Near-Field generated by a  

E-Print Network [OSTI]

influences the longitudinal electrical near-field generated by it. For this application, we designed our set extremity on the longitudinal electrical near-field generated by a coaxial cable. Considering1/12 Piezoelectric & Optical Set-up to measure an Electrical Field. Application to the Longitudinal

Paris-Sud XI, Université de

108

Gas storage and separation by electric field swing adsorption  

DOE Patents [OSTI]

Gases are stored, separated, and/or concentrated. An electric field is applied across a porous dielectric adsorbent material. A gas component from a gas mixture may be selectively separated inside the energized dielectric. Gas is stored in the energized dielectric for as long as the dielectric is energized. The energized dielectric selectively separates, or concentrates, a gas component of the gas mixture. When the potential is removed, gas from inside the dielectric is released.

Currier, Robert P; Obrey, Stephen J; Devlin, David J; Sansinena, Jose Maria

2013-05-28T23:59:59.000Z

109

Transverse electric fields' effects in the Dark Energy Camera CCDs  

E-Print Network [OSTI]

Spurious electric fields transverse to the surface of thick, fully-depleted, high-resistivity CCDs displace the photo-generated charges in the bulk of the detector, effectively modifying the pixel area and producing noticeable signals in astrometric and photometric measurements. We use data from the science verification period of the Dark Energy Survey (DES) to characterize these effects in the Dark Energy Camera (DECam) CCDs. The transverse fields mainly manifest as concentric rings (tree rings) and bright stripes near the boundaries of the detectors (edge distortions) with relative amplitudes of about 1 % and 10 % in the flat-field images, respectively. Their nature as pixel size variations is confirmed by comparing their photometric and astrometric signatures. Using flat-field images from DECam, we derive templates in the five DES photometric bands (grizY) for the tree rings and the edge distortions as a function of their position in each DECam detector. The templates are directly incorporated into the der...

Plazas, Andres; Sheldon, Erin

2014-01-01T23:59:59.000Z

110

Conduction of Electricity by Dielectric Liquids at High Field Strengths  

Science Journals Connector (OSTI)

The conductivity of highly purified heptane has been measured between optical flats at field strengths up to 600,000 volts per cm at temperatures ranging from - 190°C to 20°C. Electrode separations down to 0.005 cm were used in order to minimize the effect of space charge and ionic recombination. It is concluded that electronic or collision processes are unlikely as the source of high field conductivity in heptane and probably most other liquid dielectrics as well. It is suggested that the highly nonconducting dielectric liquids should be included as extreme cases in the general class of weak electrolytes. The presence of appreciable conductivity under high electric fields is ascribed to the lowering of the energy of the hydrogen bond by the applied field.

H. J. Plumley

1941-01-15T23:59:59.000Z

111

Missile launch detection electric field perturbation experiment. Final report  

SciTech Connect (OSTI)

The Lawrence Livermore National Laboratory and SARA Inc. participated in the ATMD missile launch activities that occurred at WSMR during January 1993. LLNL and SARA deployed sensors for monitoring of basic phenomena. An attempt was made to measure perturbations of the earth geo-potential during the launch of a Lance missile. The occurrence of the perturbation is expected from the conducting body of the missile and the exhaust plume. A set of voltage-probe antennas were used to monitor the local electric field perturbation from the launch at ranges of approximately 1 km. Examination of the data acquired during the launch period failed to show identifiable correlation of the field variations with the launch event. Three reasons are ascribed to this lack of event data: (1) The electric field potential variations have a limited spatial correlation length - the fields measured in one region have little correlation to measurements made at distances of a kilometer away. The potential variations are related to localized atmospheric disturbances and are generally unpredictable. A value for the spatial correlation length is also not known. (2) The conductivity of the plume and missile body are not adequate to produce a field perturbation of adequate magnitude. Phenomena related to the exhaust plume and missile may exist and be outside of the collection range of the equipment employed for these measurements. (3) The presence of 60 Hz power line noise was of sufficient magnitude to irreversibly contaminate measurements.

Kane, R.J.; Rynne, T.M.

1993-04-28T23:59:59.000Z

112

Parallel electric fields in the upward current region of the aurora: Indirect and direct observations  

E-Print Network [OSTI]

Parallel electric fields in the upward current region of the aurora: Indirect and direct In this article we present electric field, magnetic field, and charged particle observations from the upward current region of the aurora focusing on the structure of electric fields at the boundary between

California at Berkeley, University of

113

Acceleration of electric current-carrying string loop near a Schwarzschild black hole immersed in an asymptotically uniform magnetic field  

E-Print Network [OSTI]

We study the acceleration of an electric current-carrying and axially-symmetric string loop initially oscillating in the vicinity of a Schwarzschild black hole embedded in an external asymptotically uniform magnetic field. The plane of the string loop is orthogonal to the magnetic field lines and the acceleration of the string loop occurs due to the transmutation effect turning in the deep gravitational field the internal energy of the oscillating strings to the energy of their translational motion along the axis given by the symmetry of the black hole spacetime and the magnetic field. We restrict our attention to the motion of string loop with energy high enough, when it can overcome the gravitational attraction and escape to infinity. We demonstrate that for the current-carrying string loop the transmutation effect is enhanced by the contribution of the interaction between the electric current of the string loop and the external magnetic field and we give conditions that have to be fulfilled for an efficient acceleration. The Schwarzschild black hole combined with the strong external magnetic field can accelerate the current-carrying string loop up to the velocities close to the speed of light $v \\sim c$. Therefore, the string loop transmutation effect can potentially well serve as an explanation for acceleration of highly relativistic jets observed in microquasars and active galactic nuclei.

Arman Tursunov; Martin Kološ; Zden?k Stuchlík; Bobomurat Ahmedov

2014-09-16T23:59:59.000Z

114

Geometry of tower-type solar electric station heliostat field  

SciTech Connect (OSTI)

A general method is presented for calculating the angular positions of an arbitrary heliostat at an arbitrary position in a heliostat field surrounding a tower-type solar electric station as a function of solar position. A system of angular coordinates is used which rotates with the solar azimuth direction around the collecting tower, resulting in an expression for the proper orientation of heliostat mirrors that is independent of local latitude, solar declination and time of day. The lines on the horizontal plane of the heliostat field characterized by the same values of the angles governing the horizontal inclination of the corresponding heliostat for a given solar elevation form two families of hyperbolas with vertexes facing the center of the field. Such isoline drawings constructed from the calculations may be used to determine the limiting values of the heliostat angles during the daily and seasonal course of operation of the heliostat facility.

Tepliakov, D.I.; Aparisi, R.R.

1980-01-01T23:59:59.000Z

115

Enhanced Electroporation in Plant Tissues via Low Frequency Pulsed Electric Fields: Influence of Cytoplasmic Streaming  

E-Print Network [OSTI]

Enhanced Electroporation in Plant Tissues via Low Frequency Pulsed Electric Fields: Influence (wileyonlinelibrary.com). Pulsed electric fields (PEF) are known to be effective at permeabilizing plant tissues: cytoplasmic streaming, molecular motor proteins, plant tissue integrity, viability staining, conductivity

Ristenpart, William

116

Electric Power Generation from Co-Produced and Other Oil Field...  

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

Electric Power Generation from Co-Produced and Other Oil Field Fluids Electric Power Generation from Co-Produced and Other Oil Field Fluids Co-produced and low-temperature...

117

On the fracture toughness of ferroelectric ceramics with electric field applied parallel to the crack front  

E-Print Network [OSTI]

On the fracture toughness of ferroelectric ceramics with electric field applied parallel crack growth. The effects of electric field on the fracture toughness of both initially unpoled and poled materials are investigated. Results for the predicted fracture toughness, remanent strain

118

National High Magnetic Field Laboratory: Museum of Electricity...  

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

General Electric, an enduring giant in the electric industry. Related Electricity & Magnetism Pages Interactive Java Tutorials: Alternating Current Interactive Java Tutorials:...

119

Acceleration of electric current-carrying string loop near a Schwarzschild black hole immersed in an asymptotically uniform magnetic field  

E-Print Network [OSTI]

We study the acceleration of an electric current-carrying and axially-symmetric string loop initially oscillating in the vicinity of a Schwarzschild black hole embedded in an external asymptotically uniform magnetic field. The plane of the string loop is orthogonal to the magnetic field lines and the acceleration of the string loop occurs due to the transmutation effect turning in the deep gravitational field the internal energy of the oscillating strings to the energy of their translational motion along the axis given by the symmetry of the black hole spacetime and the magnetic field. We restrict our attention to the motion of string loop with energy high enough, when it can overcome the gravitational attraction and escape to infinity. We demonstrate that for the current-carrying string loop the transmutation effect is enhanced by the contribution of the interaction between the electric current of the string loop and the external magnetic field and we give conditions that have to be fulfilled for an efficien...

Tursunov, Arman; Stuchlík, Zden?k; Ahmedov, Bobomurat

2014-01-01T23:59:59.000Z

120

Physics Qualifier Part I--Spring 2010 7-Minute Questions 1. An electric charge distribution produces an electric field  

E-Print Network [OSTI]

Physics Qualifier Part I--Spring 2010 7-Minute Questions 1. An electric charge distribution produces an electric field where c and are constants. Find the net charge within the radius r = 1/ . 2/liter. Compute the cost of the electrical energy required by the refrigerators that cool the helium gas

Yavuz, Deniz

Note: This page contains sample records for the topic "axial electric field" 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

A Novel Approach to the Design of an In-Wheel Semi-Anhysteretic Axial-Flux Switched-Reluctance Motor Drive System for Electric Vehicles .  

E-Print Network [OSTI]

??This thesis presents the development of an in-wheel drive system consisting of an axial-flux switched-reluctance motor and a hub suspension. The motor is designed using… (more)

Lambert, Tim

2013-01-01T23:59:59.000Z

122

Parallel electric fields in the upward current region of the aurora: Numerical solutions  

E-Print Network [OSTI]

Parallel electric fields in the upward current region of the aurora: Numerical solutions R. E Direct observations of the parallel electric field by the Fast Auroral Snapshot satellite and the Polar of the properties of the observed electric fields, electron distributions, and ion distributions. The solutions

California at Berkeley, University of

123

Electric Field Induced Sphere-to-Cylinder Transition in Diblock Copolymer Thin Films  

E-Print Network [OSTI]

Electric Field Induced Sphere-to-Cylinder Transition in Diblock Copolymer Thin Films Ting Xu, A. V Manuscript Received June 21, 2004 ABSTRACT: An electric field induced sphere-to-cylinder transition in thin. In the absence of an applied electric field, thin films of the asymmetric diblock copolymer consisted of layers

Ocko, Ben

124

Electric Fields and Interference Effects inside Noncentrosymmetric Multilayer Films at Electrode  

E-Print Network [OSTI]

Electric Fields and Interference Effects inside Noncentrosymmetric Multilayer Films at Electrode, Wisconsin 53706 The electric field profile inside a self-assembled noncen- trosymmetric zirconium n to changes in the electric field strength (E) inside the film. The noncentrosymmetric ZP films

125

In situ electric fields causing electro-stimulation from conductor contact of charged human  

Science Journals Connector (OSTI)

......evolution of in situ electric fields in anatomically...the resultant in situ electric fields from a charged...Then, computed in situ electric fields were compared...magnitude of a capacitive discharge is much milder if the...object rather than an arc to the finger tip. Thus......

Toshihiro Nagai; Akimasa Hirata

2010-08-01T23:59:59.000Z

126

Neoclassical Resistivity Modified by the Driven Electric Field in Tokamak Plasmas  

E-Print Network [OSTI]

Neoclassical Resistivity Modified by the Driven Electric Field in Tokamak Plasmas Neoclassical Resistivity Modified by the DrivenNeoclassical Resistivity Modified by the Driven Electric Field in Tokamak on the neoclassical resistivity are investigated in this paper. The toroidal electric field accelerates the parallel

127

Electric Field Manipulation of Charged Copolymer Worm Micelles Kandaswamy Vijayan, Yan Geng, and Dennis Discher*  

E-Print Network [OSTI]

and the effective stiffening of the worms in an oscillating electric field are demonstrated. A brief discussion networks7 and string-of- pearl shapes8 that raise fundamental questions about responses in electric fields into spheres.13,15 Visualization of worm dynamics in oscillating electric fields is used here to quantify

Discher, Dennis

128

Tokamak with liquid metal for inducing toroidal electrical field  

DOE Patents [OSTI]

A tokamak apparatus includes a vessel for defining a reservoir and confining liquid therein. A toroidal liner disposed within said vessel defines a toroidal space within the liner confines gas therein. Liquid metal fills the reservoir outside the liner. A magnetic field is established in the liquid metal to develop magnetic flux linking the toroidal space. The gas is ionized. The liquid metal and the toroidal space are moved relative to one another transversely of the space to generate electric current in the ionized gas in the toroidal space about its major axis and thereby heat plasma developed in the toroidal space.

Ohkawa, Tihiro (La Jolla, CA)

1981-01-01T23:59:59.000Z

129

Exposure to transmission line electric fields during farming operations  

SciTech Connect (OSTI)

This paper describes an analysis of exposure to transmission line electric fields during typical farming operations. This analysis makes use of experimentally determined ''activity factors'' and time budget information for typical farms as compiled by the U.S. Department of Agriculture. A detailed exposure assessment for 18 ''typical farms'' (as defined by USDA) is provided for a base case 345 kV design. Exposure estimates for transmission lines ranging from 115-765 kV are provided for a representative farm.

Silva, M.; Huber, D.

1985-09-01T23:59:59.000Z

130

2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Parametric Modeling of Concentric Fringing Electric Field Sensors  

E-Print Network [OSTI]

of Concentric Fringing Electric Field Sensors X.B. Li, V.V. Inclan, G.I. Rowe, and A. V. Mamishev Sensors electric field (FEF) sensors are widely used for non-invasive measurement of material properties, such as porosity, viscosity, temperature, hardness, and degree of cure. FEF sensors have also been used to detect

Mamishev, Alexander

131

Electron electric dipole moment experiment using electric-field quantized slow cesium atoms  

E-Print Network [OSTI]

LBNL-51xxx Electron electric dipole momentexperiment using electric-?eld quantized slow cesium atomsA proof-of-principle electron electric dipole moment (e-EDM)

Amini, Jason M.; Munger Jr., Charles T.; Gould, Harvey

2007-01-01T23:59:59.000Z

132

Radial Electric Field and its Influence on Poloidal Magnetic Field Oscillations in the IR-T1 Tokamak  

Science Journals Connector (OSTI)

The radial electric field has been investigated in the edge plasma of IR-T1 tokamak by movable sets of single Langmuir probes....

Hamid Bolourian; Pejman Khorshid; Mahmoud Ghoranneviss…

2010-06-01T23:59:59.000Z

133

National High Magnetic Field Laboratory: Museum of Electricity...  

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

William Sturgeon developed the first rotary electric motor, a forerunner of the present-day direct-current motor. Related Electricity & Magnetism Pages Timeline: 1820 182...

134

National High Magnetic Field Laboratory: Museum of Electricity...  

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

of static electrical charges. A French engineer with an interest in electricity and magnetism, Charles-Augustin de Coulomb, developed one of the earliest instruments capable of...

135

National High Magnetic Field Laboratory: Museum of Electricity...  

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

physics courses, the Wimshurst is often the electrostatic device of choice for demonstrations of static electricity. Related Electricity & Magnetism Pages Timeline: 1880 - 188...

136

National High Magnetic Field Laboratory: Museum of Electricity...  

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

armature and numerous overlapped coils, his design remains the basis of many of today's direct-current electric motors. Related Electricity & Magnetism Pages Timeline: 1870 - 187...

137

Large electric field at the nightside plasmapause observed by the Polar spacecraft  

E-Print Network [OSTI]

Click Here for Full Article Large electric field at the nightside plasmapause observed by the Polar; accepted 16 June 2010; published 21 July 2010. [1] We report an example of large electric field with a peak amplitude of 60 mV/m observed at the plasmapause by the Polar spacecraft on April 25, 1998. This electric

California at Berkeley, University of

138

TRI-M]AL ELECTRIC FIELD I'MASIJRN$NTS FOR DETERMII.IINGDEEP OCEANWATERMOTIONS  

E-Print Network [OSTI]

TRI-M]AL ELECTRIC FIELD I'MASIJRN$NTS FOR DETERMII.IINGDEEP OCEANWATERMOTIONS: TECHNIQUESAND A PREL OF THE by G e o r g e H . S u t t o n #12;I \\ t ABSTRACT Deep ocean electric field neasureEents provide information on oceanic water uotions and on the electrical conductivity sEructure of the earthrs crust

Luther, Douglas S.

139

Electric-Field Assisted Growth and Self-Assembly of Intrinsic Silicon  

E-Print Network [OSTI]

Electric-Field Assisted Growth and Self-Assembly of Intrinsic Silicon Nanowires Ongi Englander 94720 Received January 18, 2005; Revised Manuscript Received February 8, 2005 ABSTRACT Electric are seen to respond to the presence of a localized DC electric field set up between adjacent MEMS

Lin, Liwei

140

Electric-Field Control of Magnetism Intrinsic magnetoelectric coupling describes the microscopic interaction between magnetic and  

E-Print Network [OSTI]

Electric-Field Control of Magnetism Intrinsic magnetoelectric coupling describes the microscopic interaction between magnetic and electric polarization in a single-phase material. The control of the magnetic state of a material with an electric field is an enticing prospect for device engineering. MRSEC

Maroncelli, Mark

Note: This page contains sample records for the topic "axial electric field" 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

Calculation methods and detection techniques for electric and magnetic fields from power lines with measurement verification  

E-Print Network [OSTI]

An accurate determination and characterization of electric and magnetic fields produced by power lines is a complex task. Different models must be used for far fields and for near fields. This study is centered on computation and measurement aspects...

Mamishev, Alexander V

2012-06-07T23:59:59.000Z

142

Electric Field Driven Torque in Biological Rotary Motors  

E-Print Network [OSTI]

Ion driven rotary motors, such as Fo-ATP synthase (Fo) and the bacterial flagellar motor, act much like a battery-powered electric motor. They convert energy from ions as they move from high to low potential across a membrane into torque and rotary motion. Here we propose a mechanism whereby electric fields, emanating from channels in one or more stators, act on asymmetric charge distributions due to protonated and deprotonated sites in the rotor and drive it to rotate. The model predicts an ideal scaling law between torque and ion motive force, which can be hindered by mitochondrial mutations. The rotor of Fo drives the gamma-subunit to rotate within the ATP-producing complex (F1), working against an opposing torque that rises and falls periodically with angular position. Drawing an analogy with Brownian motion of a particle in a tilted washboard potential, we compute the highly nonlinear ATP production rate vs. proton motive force (pmf), showing a minimum pmf needed to drive ATP production with important me...

Miller,, John H; Maric, Sladjana; Infante, Hans L; Claycomb, James R

2013-01-01T23:59:59.000Z

143

Nuclear Electric Dipole Moments in Chiral Effective Field Theory  

E-Print Network [OSTI]

We provide the first consistent and complete calculation of the electric dipole moments of the deuteron, helion, and triton in the framework of chiral effective field theory. The CP-conserving and CP-violating interactions are treated on equal footing and we consider CP-violating one-, two-, and three-nucleon operators up to next-to-leading-order in the chiral power counting. In particular, we calculate for the first time EDM contributions induced by the CP-violating three-pion operator. We find that effects of CP-violating nucleon-nucleon contact interactions are larger than those found in previous studies based on phenomenological models for the CP-conserving nucleon-nucleon interactions. Our results are model-independent and can be used to test various scenarios of CP violation. As examples, we study the implications of our results on the QCD $\\theta$-term and the minimal left-right symmetric model.

Bsaisou, J; Hanhart, C; Liebig, S; Meißner, Ulf-G; Minossi, D; Nogga, A; Wirzba, A

2014-01-01T23:59:59.000Z

144

Notes on Gauss law applied for time varying electric field in vacuum  

E-Print Network [OSTI]

Gauss's law in integral form states that closed surface integral of electric field is proportional to net charge present within the volume bounded by this closed surface. Gauss's law in differential form states that divergence of electric field is proportional to charge's volume density. From Gauss's law it is concluded that in vacuum, where no electric charges are present, divergence of electric field and closed surface integral of electric field are zero. In this paper we make an attempt to theoretically prove that for time-varying electric fields Gauss's law is not valid. In other words, for time-varying electric field even in vacuum divergence of electric field and closed surface integral of electric field are non-zero. We do this by considering simple sinusoidal motion of the charge and then by calculating closed surface integral at specific time of time-varying electric field due to charge motion. Results show that for charges at still and at motion with constant velocity Gauss's law is valid. However f...

Zhakatayev, Altay

2015-01-01T23:59:59.000Z

145

Neutron electric dipole moment with external electric field method in lattice QCD  

E-Print Network [OSTI]

We discuss a possibility that the Neutron Electric Dipole Moment (NEDM) can be calculated in lattice QCD simulations in the presence of the CP violating $\\theta$ term. In this paper we measure the energy difference between spin-up and spin-down states of the neutron in the presence of an uniform and static external electric field. We first test this method in quenched QCD with the RG improved gauge action on a $16^3\\times 32$ lattice at $a^{-1}\\simeq$ 2 GeV, employing two different lattice fermion formulations, the domain-wall fermion and the clover fermion for quarks, at relatively heavy quark mass $(m_{PS}/m_V \\simeq 0.85)$. We obtain non-zero values of NEDM from calculations with both fermion formulations. We next consider some systematic uncertainties of our method for NEDM, using $24^3\\times 32$ lattice at the same lattice spacing only with the clover fermion. We finally investigate the quark mass dependence of NEDM and observe a non-vanishing behavior of NEDM toward the chiral limit. We interpret this behavior as a manifestation of the pathology in the quenched approximation.

E. Shintani; S. Aoki; N. Ishizuka; K. Kanaya; Y. Kikukawa; Y. Kuramashi; M. Okawa; A. Ukawa; T. Yoshié

2006-11-27T23:59:59.000Z

146

Combined Effects of Unsteady Electric Field and Uniform Magnetic Field on Magnetoelectroconvection in a Poorly Conducting Plasma  

Science Journals Connector (OSTI)

The magnetoelectroconvective instability of a plane horizontal layer of a poorly conducting plasma subjected to a strong nonuniform electric field and uniform magnetic field is investigated in the combined magnetoelectrohydrodynamic approximations when charge formation is produced by this convection. The spatio?temporal variation of electric field density of charge distribution and temperature are found for the quiescent basic state. The influence of combined uniform magnetic field and a time?dependent electric field modulation on the behaviour of a poorly conducting plasma is studied using energy and moment methods along with Galerkin technique. The criterion for the onset of magnetoelectroconvection involving the effects of both strong electric and magnetic fields is computed and the results are compared with these obtained only in the presence of electric field. We found that the combined effect of electric and magnetic fields is more favourable to suppress convection significantly than in the presence of electric field alone. This result is useful in synthesizing smart and strong materials needed for many aeronautical automobile and biomedical engineering applications to minimize the weight and maximize the strength to achieve the sufficient dynamic advantages.

M. S. Gayathri

2006-01-01T23:59:59.000Z

147

Electric Field Calculations on Dry-Type Medium Voltage Current Transformers.  

E-Print Network [OSTI]

??This research presents potential and electric field calculations on medium voltage (MV) epoxy insulated outdoor current transformers (CTs) using a numeri-cal calculation approach. Two designs… (more)

Lakshmichand Jain, Sandeep Kumar

2012-01-01T23:59:59.000Z

148

E-Print Network 3.0 - axial symmetry Sample Search Results  

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

components. We also... --Analytical calculation, axial magnetization, magnetic field, permanent-magnet rings, radial magnetization. I... . The case of a magnet ring axially...

149

On parallel electric field generation in transversely inhomogeneous plasmas  

E-Print Network [OSTI]

The generation of parallel electric fields by the propagation of ion cyclotron waves in the plasma with a transverse density inhomogeneity was studied. It was proven that the minimal model required to reproduce the previous kinetic simulation results of E_{||} generation [Tsiklauri et al 2005, Genot et al 2004] is the two-fluid, cold plasma approximation in the linear regime. By considering the numerical solutions it was also shown that the cause of E_{||} generation is the electron and ion flow separation induced by the transverse density inhomogeneity. We also investigate how E_{||} generation is affected by the mass ratio and found that amplitude attained by E_{||} decreases linearly as inverse of the mass ratio m_i/m_e. For realistic mass ratio of m_i/m_e=1836, such empirical scaling law, within a time corresponding to 3 periods of the driving ion cyclotron wave, is producing E_{||}=14 Vm^{-1} for solar coronal parameters. Increase in mass ratio does not have any effect on final parallel (magnetic field aligned) speed attained by electrons. However, parallel ion velocity decreases linearly with inverse of the mass ratio m_i/m_e. These results can be interpreted as following: (i) ion dynamics plays no role in the E_{||} generation; (ii) E_{||} \\propto 1/m_i scaling is caused by the fact that omega_d = 0.3 omega_{ci} \\propto 1/m_i is decreasing with the increase of ion mass, and hence the electron fluid can effectively "short-circuit" (recombine with) the slowly oscillating ions, hence producing smaller E_{||}.

David Tsiklauri

2007-11-28T23:59:59.000Z

150

Radial electric fields from larmor radius effects in the field-reversed theta pinch  

SciTech Connect (OSTI)

The generation of radial electric field from the different Larmor radii between the diffusing ions and electrons in Field-Reversed Theta Pinch (FR theta P) has been evaluated by developing a new computer code, FLR. The code treats the background electrons at point particles, while for large-orbit ions the effects of finite Larmor radius are incorporated into an accurate density formulation. This is necessary since in a small device whose size is comparable to an ion gyroradius (e.g., FR theta P) most ions will contribute to the density over a fairly large region of the plasma. The actual ion density at any point in the plasma represents a time-averaged contribution from all particles whose gyro-orbits pass through that point. The FLR code has predicted the electric field strengths between 10/sup 3/ and 10/sup 4/ volts/cm, which is in good agreement with the experimental values of FRX-A measurements which correspond roughly to the order of 10/sup 3/ volts/cm.

Hu, Y.

1980-01-01T23:59:59.000Z

151

New electric-field scaling law for swarm experiments  

Science Journals Connector (OSTI)

We generalize the familiar result that the drift velocity Vd and the product pD of the pressure and the diffusion coefficient depend on pressure p and electric field E only through the ratio Ep in swarm experiments. Our new scaling law applies to different systems to the extent that their elastic and inelastic cross sections are in the same ratio. We present model calculations of Vd for electrons in gaseous CH4-Ar and CH4-He4 mixtures predicting that the scaling is approximately obeyed if the CH4 concentrations are appropriately related. We also examine Vd and D? data for electrons in CH4 and SiH4 at low E and find that the scaling is approximately obeyed with a factor of 6. This suggests strongly that the low energy (?1 eV) effective elastic and inelastic electron cross sections for these molecules have approximately the same shape and differ by the same factor, which is approximately 6. Thus in particular we predict a Ramsauer minimum for SiH4, which has been suggested previously.

P. Kleban; L. Foreman; H. Ted Davis

1981-03-01T23:59:59.000Z

152

The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP  

Science Journals Connector (OSTI)

The Electric and Magnetic Field Instrument and Integrated Science (EMFISIS) investigation on the NASA Radiation ... mission provides key wave and very low frequency magnetic field measurements to understand radia...

C. A. Kletzing; W. S. Kurth; M. Acuna; R. J. MacDowall…

2014-01-01T23:59:59.000Z

153

The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP  

Science Journals Connector (OSTI)

The Electric and Magnetic Field Instrument and Integrated Science (EMFISIS) investigation on the NASA Radiation ... mission provides key wave and very low frequency magnetic field measurements to understand radia...

C. A. Kletzing; W. S. Kurth; M. Acuna; R. J. MacDowall…

2013-11-01T23:59:59.000Z

154

Resonance scattering formalism for the hydrogen lines in the presence of magnetic and electric fields  

Science Journals Connector (OSTI)

We derive a formalism for the computation of resonance-scattering polarization of hydrogen lines in the presence of simultaneous magnetic and electric fields, within a framework of the quantum theory of polarized line formation in the limit of complete frequency redistribution and of collisionless regime. Quantum interferences between fine-structure levels are included in this formalism. In the presence of a magnetic field, these interferences affect, together with the magnetic Hanle effect, the polarization of the atomic levels. In the presence of an electric field, interferences between distinct orbital configurations are also induced, further affecting the polarization of the hydrogen levels. In turn, the electric field is expected to affect the polarization of the atomic levels (electric Hanle effect), in a way analogous to the magnetic Hanle effect. We find that the simultaneous action of electric and magnetic fields give rise to complicated patterns of polarization and depolarization regimes, for varying geometries and field strengths.

Roberto Casini

2005-06-22T23:59:59.000Z

155

Effect of Joule heating on orientation of spheroidal particle in alternating electric field  

E-Print Network [OSTI]

Effect of Joule heating on orientation of spheroidal particle in alternating electric field Yu electric conductivities. We show that the rate of Joule heating of the particle depends on the orientation electric conductivity in the system. The frequen- cies 1 and 2 are determined by biquadratic equation see

Elperin, Tov

156

Saline tracer visualized with three-dimensional electrical resistivity tomography: Field-scale spatial moment analysis  

E-Print Network [OSTI]

Saline tracer visualized with three-dimensional electrical resistivity tomography: Field; accepted 14 February 2005; published 24 May 2005. [1] Cross-well electrical resistivity tomography (ERT., and S. M. Gorelick (2005), Saline tracer visualized with three-dimensional electrical resistivity

Singha, Kamini

157

Flexible gas insulated transmission line having regions of reduced electric field  

DOE Patents [OSTI]

A gas insulated transmission line having radially flexible field control means for reducing the electric field along the periphery of the inner conductor at predetermined locations wherein the support insulators are located. The radially flexible field control means of the invention includes several structural variations of the inner conductor, wherein careful controlling of the length to depth of surface depressions produces regions of reduced electric field. Several embodiments of the invention dispose a flexible connector at the predetermined location along the inner conductor where the surface depressions that control the reduced electric field are located.

Cookson, Alan H. (Pittsburgh, PA); Fischer, William H. (Wilkins Township, Allegheny County, PA); Yoon, Kue H. (Pittsburgh, PA); Meyer, Jeffry R. (Penn Hills Township, Allegheny County, PA)

1983-01-01T23:59:59.000Z

158

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such as bringing cable television into homes and connecting home video equipment. Related Electricity & Magnetism Pages Museum: Transatlantic Telegraph Cable Timeline: 1910 - 192...

159

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are used in plasma screens and various scientific apparatus in which power must be produced in a microwave frequency. Related Electricity & Magnetism Pages Timeline: 1920 1929...

160

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television, they were benefitting from De Forests discovery. Related Electricity & Magnetism Pages Pioneers: John Ambrose Fleming Pioneers: Lee De Forest Timeline: 1900 190...

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161

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accomplish the same tasks and the choice between them comes down to individual tastes. Related Electricity & Magnetism Pages Interactive Java Tutorials: Electromagnetic Induction...

162

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in 1872), which argued that facial expressions are universal among humans and animals. Related Electricity & Magnetism Pages Pioneers: Luigi Galvani Timeline: 1850 186...

163

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theory that oxygen was an essential part of all acids. Related Electricity & Magnetism Pages Interactive Java Tutorials: Daniell Cell Interactive Java Tutorials: Simple...

164

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Investigators cited human error as the cause of the collision. Related Electricity & Magnetism Pages Maglev Trains: On Track with Superconductivity Magnets from Mini to Mighty If...

165

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was still unrealized. Davenport first became interested in electricity and magnetism when he heard about a magnet-based machine built by Joseph Henry used to separate...

166

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from our spinning CD players to dancing Santa Claus dolls. Related Electricity & Magnetism Pages Interactive Java Tutorials: Daniell Cell Interactive Java Tutorials: Simple...

167

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several Geiger counters at once to observe showers of cosmic rays, a phenomenon which became the focus of his research. Related Electricity & Magnetism Pages Timeline: 1900 190...

168

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features allowing fast and easy on-the-spot measurements. Related Electricity & Magnetism Pages Electromagnetic Deflection in a Cathode Ray Tube, I Discovering how cathode...

169

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example, are often useful in widefield fluorescence microscopy. Related Electricity & Magnetism Pages Interactive Java Tutorials: Arc Lamp Museum: Fluorescent Lamp Pioneers: Sir...

170

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others to observe the wonders of electrostatics first hand. Related Electricity & Magnetism Pages Pioneers: William Gilbert Timeline: 1600 1699 Tutorials: Electrostatic...

171

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method for measuring resistance is still widely used today. Related Electricity & Magnetism Pages Interactive Java Tutorials: Rheostat Interactive Java Tutorials: Wheatstone...

172

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the number one cause of death in the United States today. Related Electricity & Magnetism Pages Interactive Java Tutorials: Electromagnetic Induction Interactive Java...

173

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high-tech advances made it possible for manufacturers to produce fully electronic meters with LCD screens Related Electricity & Magnetism Pages Timeline: 1870 1879...

174

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and businesses as an energy-saving alternative to incandescent. Related Electricity & Magnetism Pages Interactive Java Tutorials: Arc Lamp Museum: Arc Lamp Pioneers: Nikola Tesla...

175

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important components in electronics, such as lights and radio. Related Electricity & Magnetism Pages Interactive Java Tutorial: Capacitor Interactive Java Tutorial: Electrostatic...

176

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century and continues to evolve and influence today's culture. Related Electricity & Magnetism Pages Morse Telegraph The man most commonly associated with the telegraph, Samuel...

177

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title in honor of his contributions to the transatlantic telegraph cable. Related Electricity & Magnetism Pages Museum: Morse Telegraph Pioneers: Lord Kelvin Timeline: 1850 186...

178

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uncharged arrangement is proportional to the radiation intensity. Related Electricity & Magnetism Pages Museum: Torsion Balance Pioneers: William Gilbert Timeline: 1775 1799...

179

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generators capable of generating larger and larger voltages. Related Electricity & Magnetism Pages Timeline: 600 BC - 1599 Timeline: 1600 - 1699 Timeline: 1700 - 1749 Tutorials:...

180

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Car batteries contain from 60 to 80 percent recycled materials. Related Electricity & Magnetism Pages Interactive Java Tutorials: Daniell Cell Interactive Java Tutorials: Simple...

Note: This page contains sample records for the topic "axial electric field" from the National Library of EnergyBeta (NLEBeta).
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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

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which is why it can be used repeatedly after it has been initially charged via friction. Related Electricity & Magnetism Pages Pioneers: Alessandro Volta Timeline: 1750 1774...

182

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(sometimes called an atom smasher) can be miles long, a cyclotron can be small enough to slip inside your pocket. Related Electricity & Magnetism Pages Timeline: 1930 - 193...

183

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became the most profitable product of the great inventor. Related Electricity & Magnetism Pages Interactive Java Tutorials: Daniell Cell Interactive Java Tutorials: Simple...

184

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to the Italian scientist and inventor Alessandro Volta. Related Electricity & Magnetism Pages Interactive Java Tutorials: Daniell Cell Interactive Java Tutorials: Leyden...

185

Electric-field dependence of pairing temperature and tunneling in high-temperature superconductors  

Science Journals Connector (OSTI)

Using the Bethe-Salpeter equation including high electric fields, the dependence of the critical temperature of onsetting superconductivity on the applied field is calculated analytically. The critical temperature of pairing is shown to increase with the applied field strength. This is a new field effect and could contribute to the explanation of recent experiments on field-induced superconductivity. From the field dependence of the Bethe-Salpeter equation, the two-particle bound-state solution is obtained as a resonance with a tunneling probability analogous to the WKB solution of a single particle confined in a potential and coupled to an electrical field.

K. Morawetz

2002-11-27T23:59:59.000Z

186

Influence of High-Frequency Electric Fields on Equilibrium and Stability of Toroidal Plasmas  

Science Journals Connector (OSTI)

The effect of a high-frequency toroidal electric field on equilibrium and stability of a toroidal plasma is considered. It is shown that for some values of the electric field, one can change the particle orbits considerably with important consequences to diffusion and stability.

M. Dobrowolny and O. P. Pogutse

1970-12-07T23:59:59.000Z

187

Electron-deformation mechanism of photoexcitation of hypersound in semiconductors in a dc electric field  

SciTech Connect (OSTI)

The effect of a dc electric field on photoexcitation of a hypersonic pulse in a semiconductor via an electron-deformation mechanism is studied. The profiles of acoustic pulses are simulated for different directions of the electric field. (laser applications and other topics in quantum electronics)

Chigarev, N V [International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)

2002-09-30T23:59:59.000Z

188

Analysis of charge transport during lightning using balloon-borne electric field sensors and Lightning  

E-Print Network [OSTI]

a lightning flash have been obtained by a balloon-borne electric field sonde or Esonde. This paper developsAnalysis of charge transport during lightning using balloon-borne electric field sensors and Lightning Mapping Array William W. Hager,1 Richard G. Sonnenfeld,2 Beyza Caliskan Aslan,1 Gaopeng Lu,2

Hager, William

189

PHYSICAL REVIEW E 86, 036314 (2012) ac electric fields drive steady flows in flames  

E-Print Network [OSTI]

PHYSICAL REVIEW E 86, 036314 (2012) ac electric fields drive steady flows in flames Aaron M. Drews June 2012; published 20 September 2012) We show that time-oscillating electric fields applied-averaged force that drives the steady flows observed experimentally. A quantitative model describes the response

Heller, Eric

190

Determination of the 85 Rb ng-series quantum defect by electric-field-induced resonant energy  

E-Print Network [OSTI]

Determination of the 85 Rb ng-series quantum defect by electric-field-induced resonant energy of an electric field 1 . The resonant energy transfer process between Rydberg atoms is driven by the electric-series of potassium. The range of electric fields or "width" over which signifi- cant resonant energy transfer can

Le Roy, Robert J.

191

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Pages Interactive Java Tutorials: Galvanometer Interactive Java Tutorials: Magnetic Field Lines Around a Wire, I Interactive Java Tutorials: Magnetic Field Lines Around a Wire,...

192

Electric field control of spin-resolved edge states in graphene quantum nanorings  

SciTech Connect (OSTI)

The electric-field effect on the electronic and magnetic properties of triangular and hexagonal graphene quantum rings with zigzag edge termination is investigated by means of the single-band tight-binding Hamiltonian and the mean-field Hubbard model. It is shown how the electron and spin states in the nanoring structures can be manipulated by applying an electric field. We find different spin-depolarization behaviors with variation of electric field strength due to the dependence of spin densities on the shapes and edges of this kind of nanorings. In the case of triangular quantum rings, the magnetization on the inner and outer edges can be selectively tuned and the spin states depolarize gradually as the field strength is increased, while in the case of hexagonal nanorings, the transverse electric field reduces the magnetic moments on both inner and outer edges symmetrically and rapidly.

Farghadan, R., E-mail: rfarghadan@kashanu.ac.ir [Department of Physics, University of Kashan, Kashan (Iran, Islamic Republic of); Saffarzadeh, A. [Department of Physics, Payame Noor University, P.O. Box 19395-3697, Tehran (Iran, Islamic Republic of); Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6 (Canada)

2014-05-07T23:59:59.000Z

193

Graphene nanoribbons in criss-crossed electric and magnetic fields  

Science Journals Connector (OSTI)

...Electronic and photonic properties of graphene layers and carbon nanoribbons' compiled...Gumbs, Danhong Huang and Oleksiy Roslyak Graphene nanoribbons in criss-crossed electric...Kirtland Air Force Base, , NM-87117, USA Graphene nanoribbons (GNRs) in mutually perpendicular...

2010-01-01T23:59:59.000Z

194

National High Magnetic Field Laboratory: Museum of Electricity...  

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lamented in his later years, "I hate what they've done to my child ... I would never let my own children watch it." Related Electricity & Magnetism Pages Timeline: 1910 192...

195

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to wave theory, Weber was very interested in the phenomena of electricity and magnetism. His interest in these areas he held in common with Carl Friedrich Gauss, with whom...

196

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the fact that there is a computer there at all is owed in large part to Apples role in making computers personal. Related Electricity & Magnetism Pages Timeline: 1960 19...

197

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On the big screen, a Tesla coil was used to produce lighting effects for the 1979 film "Star Trek: The Motion Picture." Related Electricity & Magnetism Pages Timeline: 1890 - 18...

198

Emerging issues in extremely-low-frequency electric and magnetic field health research  

SciTech Connect (OSTI)

Concern has increased over potential consequences of exposure to electric and magnetic fields of extremely low frequency (0-100 Hz), particularly from power transmission and distribution. Also at issue are electrical environments in homes and workplaces. Until recently, research focused on the electric, rather than the magnetic, field; now, both are under extensive investigation. A review of research to date indicates the following: Electric and magnetic fields can produce effects in vitro, with the locus of field interaction believed to be at the cell membrane. Chronic in vivo electric field exposure fails to produce effects except in behavior, neurophysiology, endocrinology, and, possibly, fetal development. The extrapolation of these animal data to humans requires further research. The epidemiological literature has, in some cases, reported an association between increased cancer rates and putative field exposure. Exposure assessments indicate that, in all likelihood, human exposures to 60-Hz electric fields of the magnitudes found under transmission lines are very infrequent; assessments are continuing to characterize exposure to 60-Hz magnetic fields and to measure the field frequency spectra found in residential and workplace settings. The public health issues emerging from this research focus on fetal development and on the initiation or promotion of cancer. It is critical to reduce existing uncertainties in order to enable valid risk assessment.

Kavet, R.I.; Banks, R.S.

1986-04-01T23:59:59.000Z

199

Emerging issues in extremely-low-frequency electric and magnetic field health research  

Science Journals Connector (OSTI)

Concern has increased over potential consequences of exposure to electric and magnetic fields of extremely low frequency (0–100 Hz), particularly from power transmission and distribution. Also at issue are electrical environments in homes and workplaces. Until recently, research focused on the electric, rather than the magnetic, field; now, both are under extensive investigation. A review of research to date indicates the following: (1) Electric and magnetic fields can produce effects in vitro, with the locus of field interaction believed to be at the cell membrane. (2) Chronic in vivo electric field exposure fails to produce effects except in behavior, neurophysiology, endocrinology, and, possibly, fetal development. The extrapolation of these animal data to humans requires further research. (3) The epidemiological literature has, in some cases, reported an association between increased cancer rates and putative field exposure. (4) Exposure assessments indicate that, in all likelihood, human exposures to 60-Hz electric fields of the magnitudes found under transmission lines are very infrequent; assessments are continuing to characterize exposure to 60-Hz magnetic fields and to measure the field frequency spectra found in residential and workplace settings. The public health issues emerging from this research focus on fetal development and on the initiation or promotion of cancer. It is critical to reduce existing uncertainties in order to enable valid risk assessment.

Robert I. Kavet; Robert S. Banks

1986-01-01T23:59:59.000Z

200

The covariant description of electric and magnetic field lines of null fields: application to Hopf-Ranada solutions  

E-Print Network [OSTI]

The concept of electric and magnetic field lines is intrinsically non-relativistic. Nonetheless, for certain types of fields satisfying certain geometric properties, field lines can be defined covariantly. More precisely, two Lorentz-invariant 2D surfaces in spacetime can be defined such that magnetic and electric field lines are determined, for any observer, by the intersection of those surfaces with spacelike hyperplanes. An instance of this type of field is constituted by the so-called Hopf-Ranada solutions of the source-free Maxwell equations, which have been studied because of their interesting topological properties, namely, linkage of their field lines. In order to describe both geometric and topological properties in a succinct manner, we employ the tools of Geometric Algebra (aka Clifford Algebra) and use the Clebsch representation for the vector potential as well as the Euler representation for both magnetic and electric fields. This description is easily made covariant, thus allowing us to define electric and magnetic field lines covariantly in a compact geometric language. The definitions of field lines can be phrased in terms of 2D surfaces in space. We display those surfaces in different reference frames, showing how those surfaces change under Lorentz transformations while keeping their topological properties. As a byproduct we also obtain relations between optical helicity, optical chirality and generalizations thereof, and their conservation laws.

S. J. van Enk

2013-02-12T23:59:59.000Z

Note: This page contains sample records for the topic "axial electric field" from the National Library of EnergyBeta (NLEBeta).
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201

Neutron scattering studies of crude oil viscosity reduction with electric field  

Science Journals Connector (OSTI)

Abstract The small angle neutron scattering experiment has confirmed the theoretical prediction that a strong electric field induces the suspended nano-particles inside crude oil to aggregate into short chains along the field direction. This aggregation breaks the symmetry, making the viscosity anisotropic: along the field direction, the viscosity is significantly reduced. The experiment enables us to determine the induced chain size and shape, verifies that the electric field works for all kinds of crude oils, paraffin-based, asphalt-based, and mix-based. The basic physics of such field induced viscosity reduction is applicable to all kinds of suspensions.

R. Tao; E. Du; H. Tang; X. Xu

2014-01-01T23:59:59.000Z

202

Effect of internal electric field on InAs/GaAs quantum dot solar cells  

SciTech Connect (OSTI)

We studied time-resolved carrier recombination in InAs/GaAs quantum dot (QD) solar cells. The electric field in a p-i-n diode structure spatially separates photoexcited carriers in QDs, strongly affecting the conversion efficiency of intermediate-band solar cells. The radiative decay lifetime is dramatically reduced in a strong electric field (193?kV/cm) by efficient recombination due to strong carrier localization in each QD and significant tunneling-assisted electron escape. Conversely, an electric field of the order of 10?kV/cm maintains electronic coupling in the stacked QDs and diminishes tunneling-assisted electron escape.

Kasamatsu, Naofumi; Kada, Tomoyuki; Hasegawa, Aiko; Harada, Yukihiro; Kita, Takashi [Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501 (Japan)

2014-02-28T23:59:59.000Z

203

Electric field detection of coherent synchrotron radiation in a storage ring generated using laser bunch slicing  

SciTech Connect (OSTI)

The electric field of coherent synchrotron radiation (CSR) generated by laser bunch slicing in a storage ring has been detected by an electro-optic sampling method. The gate pulses for sampling are sent through a large-mode-area photonic-crystal fiber. The observed electric field profile of the CSR is in good agreement with the spectrum of the CSR observed using Fourier transform far-infrared spectrometry, indicating good phase stability in the CSR. The longitudinal density profiles of electrons modulated by laser pulses were evaluated from the electric field profile.

Katayama, I. [Interdisciplinary Research Center, Yokohama National University, Yokohama 240-8501 (Japan); Shimosato, H.; Bito, M.; Furusawa, K. [Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531 (Japan); Adachi, M.; Zen, H.; Kimura, S.; Katoh, M. [UVSOR, Institute of Molecular Science, Okazaki 444-8585 (Japan); School of Physical Sciences, Graduate Universities for Advanced Studies (SOKENDAI), Okazaki 444-8585 (Japan); Shimada, M. [High Energy Accelerator Research Organization, KEK, Tsukuba 305-0801 (Japan); Yamamoto, N.; Hosaka, M. [Graduate School of Engineering, Nagoya University, Nagoya 464-8603 (Japan); Ashida, M. [Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531 (Japan); PRESTO, JST (Japan)

2012-03-12T23:59:59.000Z

204

Theoretical Investigation of Bacteria Polarizability under Direct Current Electric Fields  

Science Journals Connector (OSTI)

The characteristic thickness of the electric double layer known as the Debye length is given by ?D* = ((?m*kBT*)/(2z2e2cbulk*))1/2, where kB is the Boltzmann constant, T* is the absolute temperature, cbulk* is the bulk electrolyte concentration, z is the valence of ions in a symmetric z/z electrolyte, and e is the elementary electric charge. ... The fluid experiences a resistance due to the soft layer, which can be modeled within the framework of the Debye–Bueche model. ...

Naga Neehar Dingari; Cullen R. Buie

2014-03-25T23:59:59.000Z

205

On the electric field at the tip of dart leaders in lightning flashes Vernon Cooraya,, Marley Becerra a,1  

E-Print Network [OSTI]

On the electric field at the tip of dart leaders in lightning flashes Vernon Cooraya,�, Marley Becerra a,1 , Vladimir Rakov b a Division for Electricity and Lightning Research, A°ngstro¨m Laboratory Keywords: Lightning Energy Electric field Dart leaders Electrical discharges X-rays a b s t r a c

Florida, University of

206

Comparison Between Two Models for Interactions Between Electric and Magnetic Fields and Proteins in Cell Membranes  

E-Print Network [OSTI]

, Melbourne, Australia. Departments of 2 Medical Radiation Physics and 3 Neurosurgery, Lund University, Lund Lines; Interaction Models; Biological Effects Introduction Static magnetic and electric fields occur naturally; time-varying fields, however, do not. These man-made fields have health consequences remains

Halgamuge, Malka N.

207

Analysis of magnetic fields produced far from electric power lines  

SciTech Connect (OSTI)

In this paper, the authors develop a simple and general method for analyzing the magnetic fields produced by power lines at far distances, that is, at distances large in comparison to the spacing between the line's phase conductors. Magnetic fields produced far from conventional power lines have remarkably simple properties. The authors present formulae for the fields produced by various conventional and unconventional power line configurations; included are line designs characterized by reduced magnetic-field levels. Errors in the formulae are less than [plus minus]10% at the edge of a typical transmission right-of-way.

Kaune, W.T. (Enertech Consultants Campbell, CA (United States)); Zaffanella, L.E. (High Voltage Transmission Research Center, Lenox, MA (United States))

1992-10-01T23:59:59.000Z

208

National High Magnetic Field Laboratory: Museum of Electricity...  

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

diagnostic cardiology and even helped garner a Nobel Prize. Electrocardiograph The field of electrophysiology dates back to Italian physician Luigi Galvani, and scientists...

209

National High Magnetic Field Laboratory: Museum of Electricity...  

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

which at the receiving end flowed through an electromagnet. This created a magnetic field that caused the receivers metal key to be attracted to an underlying plate,...

210

Effect of the electric field on the primary scintillation from CF4  

Science Journals Connector (OSTI)

The effect of an electric field on the primary scintillation from CF4 in the ultraviolet and visible wavelength regions (200–800 nm) is reported. The study was performed in the pressure range from 1 to 5 bar and at electric fields of up to 2 kV/cm. Photon emission spectra, fully corrected for the detection response, and the absolute photon yields in the ultraviolet and visible regions are reported. The CF4 emission spectra and the photon fluxes show no variations with the field at low pressures ( ? 1 bar ) , while at higher pressures the effect of the field on the scintillation is strong: the ultraviolet emission intensity increases and the visible intensity decreases with the field strength. Time spectra of the primary scintillation for several applied electric field strengths are also reported for the two wavelength regions of light emission.

A. Morozov; M.M.F.R. Fraga; L. Pereira; L.M.S. Margato; S.T.G. Fetal; B. Guerard; G. Manzin; F.A.F. Fraga

2011-01-01T23:59:59.000Z

211

Energy Conservation and Efficiency Improvement for the Electric Motors Operating in U.S. Oil Fields  

E-Print Network [OSTI]

energy use in the U.S. is comparable to all auto energy use. Electric motors are the largest users of energy in all mineral extraction activities. In oil fields, electric motors drive the pumping units used for lifting the oil and water to the surface...

Ula, S.; Cain, W.; Nichols, T.

212

Vacuum gaps with small tunnel currents at large electric field and its  

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

Vacuum gaps with small tunnel currents at large electric field and its Vacuum gaps with small tunnel currents at large electric field and its potential applications for energy storage, charge storage and power supplies. Friday, May 27, 2011 - 4:00pm SSRL Conference Room 137-226 Alfred Hubler, Department of Physics, University of Illinois, Urbana-Champaign We study tunnel currents and electric break down in vacuum gaps experimentally and theoretically. We find that electric field at break down in nano vacuum gaps is 3 order of magnitude larger than in macroscopic capacitors. Pointed electrodes increase the limiting field even further. Eigen states in the gap can help to reduce tunnel currents. We discuss applications of this technology for energy storage, charge storage, and power supplies. Speaker Bio: Professor Alfred Hubler is the director of the Center for

213

Performance Enhancement of a Graphene-Zinc Phosphide Solar Cell Using the Electric Field-Effect  

E-Print Network [OSTI]

Performance Enhancement of a Graphene-Zinc Phosphide Solar Cell Using the Electric Field, University of California, Berkeley, California 94720, United States Material Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States § Department of Applied Physics

Javey, Ali

214

Simulation and visualization of fields and energy flows in electric circuits with idealized geometries  

E-Print Network [OSTI]

This thesis develops a method to simulate and visualize the fields and energy flows in electric circuits, using a simplified physical model based on an idealized geometry. The physical models combine and extend previously ...

Ohannessian, Mesrob I., 1981-

2005-01-01T23:59:59.000Z

215

Use of Optical Spectra to Measure Large Electric Fields in a Hot?Ion Plasma  

Science Journals Connector (OSTI)

Intense electric fields found in the beam?plasma interface of Burnout V give rise to satellite spectra of the helium 23 P?43 D 3 F triplet (4471 Å) and the 21 P?41 D 1 F singlet (4922 Å) emission lines. Electric?field strengths increasing from near zero on the magnetic axis to about 7 kV cm?1 at 1 cm and then decreasing to less than 2 kV cm?1 at 2?cm radial distance are found. An Abel inversion giving intensity of the satellite lines as a function of plasma radius together with displacement and intensity of ? and ? components in the Zeeman structure of the satellites gives the electric?field strength and implies that the direction of the electric field is perpendicular to the magnetic axis.

F. R. Scott; R. V. Neidigh; J. R. McNally Jr.; William S. Cooper III

1970-01-01T23:59:59.000Z

216

Generalized charge simulation method for the calculation of the electric field in high voltage substations  

Science Journals Connector (OSTI)

This paper deals with the calculation of the electric field strength in high voltage (HV) substations comprising complex geometrical structures. Generalized charge simulation ... is to examine the influence of to...

Aleksandar Rankovi?; Milan S. Savi?

2010-07-01T23:59:59.000Z

217

Electric Field-Modulated Non-Ohmic Behavior of Carbon Nanotube Fibers in Polar Liquids  

E-Print Network [OSTI]

We report a previously unseen non-Ohmic effect in which the resistivity of carbon nanotube fibers immersed in polar liquids is modulated by the applied electric field. This behavior depends on the surface energy, dielectric constant, and viscosity...

Terrones, Jeronimo; Elliott, James A.; Vilatela, Juan J.; Windle, Alan H.

2014-07-15T23:59:59.000Z

218

Passing particle toroidal precession induced by electric field in a tokamak  

SciTech Connect (OSTI)

Characteristics of a rotation of passing particles in a tokamak with radial electric field are calculated. The expression for time-averaged toroidal velocity of the passing particle induced by the electric field is derived. The electric-field-induced additive to the toroidal velocity of the passing particle appears to be much smaller than the velocity of the electric drift calculated for the poloidal magnetic field typical for the trapped particle. This quantity can even have the different sign depending on the azimuthal position of the particle starting point. The unified approach for the calculation of the bounce period and of the time-averaged toroidal velocity of both trapped and passing particles in the whole volume of plasma column is presented. The results are obtained analytically and are confirmed by 3D numerical calculations of the trajectories of charged particles.

Andreev, V. V. [Peoples' Friendship University of Russia, Ordzhonikidze St. 3, Moscow 117198 (Russian Federation)] [Peoples' Friendship University of Russia, Ordzhonikidze St. 3, Moscow 117198 (Russian Federation); Ilgisonis, V. I.; Sorokina, E. A. [Peoples' Friendship University of Russia, Ordzhonikidze St. 3, Moscow 117198 (Russian Federation) [Peoples' Friendship University of Russia, Ordzhonikidze St. 3, Moscow 117198 (Russian Federation); NRC “Kurchatov Institute”, Kurchatov Sq. 1, Moscow 123182 (Russian Federation)

2013-12-15T23:59:59.000Z

219

The Electric Field and Waves Instruments on the Radiation Belt Storm Probes Mission  

E-Print Network [OSTI]

The Electric Fields and Waves (EFW) Instruments on the two Radiation Belt Storm Probe (RBSP) spacecraft (recently renamed the Van Allen Probes) are designed to measure three dimensional quasi-static and low frequency ...

Wygant, J. R.

220

Strontium Titanate DC Electric Field Switchable and Tunable Bulk Acoustic Wave Solidly Mounted Resonator  

E-Print Network [OSTI]

Strontium Titanate DC Electric Field Switchable and Tunable Bulk Acoustic Wave Solidly Mounted Abstract - A voltage switchable/tunable strontium titanate solidly mounted BAW resonator was implemented films, piezoelectric resonators. I. INTRODUCTION Strontium titanate (STO) and barium strontium titanate

York, Robert A.

Note: This page contains sample records for the topic "axial electric field" 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

Spherical harmonic series solution of fields excited by vertical electric dipole in earth-ionosphere cavity  

Science Journals Connector (OSTI)

The spherical harmonic series expression of electromagnetic fields excited by ELF/SLF vertical electric dipole in the spherical earth- ... the sum of two traveling waves in the SLF band. Moreover, the results are...

Yuanxin Wang; Wensheng Fan; Weiyan Pan…

2008-01-01T23:59:59.000Z

222

Finite-geometry models of electric field noise from patch potentials in ion traps  

E-Print Network [OSTI]

We model electric field noise from fluctuating patch potentials on conducting surfaces by taking into account the finite geometry of the ion trap electrodes to gain insight into the origin of anomalous heating in ion traps. ...

Low, Guang Hao

223

Effect of an external electrical field on ignition and combustion processes  

Science Journals Connector (OSTI)

Published results of experimental studies on the effect of an external sub-breakdown electrical field on and combustion characteristics are reviewed. Analysis of the material presented reveals general princip ...

D. A. Yagodnikov; A. V. Voronetskii

224

Car?Parrinello Molecular Dynamics in a Finite Homogeneous Electric Field  

Science Journals Connector (OSTI)

We introduce a variational total?energy functional to treat finite homogeneous electric fields with periodic boundary conditions and show that this functional can be implemented within a Car?Parrinello molecular dynamics scheme. The coupling to an electric field is achieved through the Berry?phase expression of the polarization. The minimization of this extended functional gives a ground state which describes the polarized state in an electric field. For a crystalline system the ground state of this extended functional preserves the Bloch symmetry. The reliability of the method is demonstrated in the case of bulk MgO for the Born effective charges and the high? and low?frequency dielectric constants. In the latter case we evaluated the static dielectric constant by performing a damped molecular dynamics in the presence of a finite electric field completely avoiding the calculation of the dynamical matrix.

P. Umari; Alfredo Pasquarello

2003-01-01T23:59:59.000Z

225

External Electric Field Catalyzed N2O Decomposition on Mn-Embedded Graphene  

Science Journals Connector (OSTI)

External Electric Field Catalyzed N2O Decomposition on Mn-Embedded Graphene ... Key Laboratory of Automobile Materials, Ministry of Education, and Department of Materials Science and Engineering, Jilin University, Changchun 130022, China ...

E. H. Song; J. M. Yan; J. S. Lian; Q. Jiang

2012-09-05T23:59:59.000Z

226

Effect of electric field on heat transfer performance of automobile radiator at low frontal air velocity  

Science Journals Connector (OSTI)

The effect of electric field on the performance of automobile radiator is investigated in this work. In this experiment, a louvered fin and flat tube automobile radiator was mounted in a wind tunnel and there was heat exchange between a hot water stream circulating inside the tube and a cold air stream flowing through the external surface. The electric field was supplied on the airside of the heat exchanger and its supply voltage was adjusted from 0 kV to 12 kV. From the experiment, it was found that the unit with electric field pronounced better heat transfer rate, especially at low frontal velocity of air. The correlations for predicting the air-side heat transfer coefficient of the automobile radiator, with and without electric field, at low frontal air velocity were also developed and the predicted results agreed very well with the experimental data.

S. Vithayasai; T. Kiatsiriroat; A. Nuntaphan

2006-01-01T23:59:59.000Z

227

Reversible Transition of Graphene from Hydrophobic to Hydrophilic in the Presence of an Electric Field  

Science Journals Connector (OSTI)

Reversible Transition of Graphene from Hydrophobic to Hydrophilic in the Presence of an Electric Field ... † Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, and School of Materials Science and Engineering, Jilin University, Changchun 130022, China ...

Q. G. Jiang; Z. M. Ao; D. W. Chu; Q. Jiang

2012-08-22T23:59:59.000Z

228

Structures and Quantum Conduction of Copper Nanowires under Electric Fields Using First Principles  

Science Journals Connector (OSTI)

Structures and Quantum Conduction of Copper Nanowires under Electric Fields Using First Principles ... Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, and Department of Materials Science and Engineering, Jilin University, Changchun 130022, China ...

C. He; P. Zhang; Y. F. Zhu; Q. Jiang

2008-05-22T23:59:59.000Z

229

External Electric Field Modulated Electronic and Structural Properties of ?111? Si Nanowires  

Science Journals Connector (OSTI)

External Electric Field Modulated Electronic and Structural Properties of ?111? Si Nanowires ... Key Laboratory of Automobile Materials (Jilin University), Ministry of Educations, and Department of Materials Science and Engineering, Jilin University, Changchun 130022, China ...

R. Q. Zhang; W. T. Zheng; Q. Jiang

2009-05-27T23:59:59.000Z

230

Molecular dynamics of a grid-mounted molecular dipolar rotor in a rotating electric field  

Science Journals Connector (OSTI)

...interesting. Analyses (23–25) of a one-dimensional string of rotors interacting by electrostatic forces suggest...consisting of two concentric carbon nanotubes in a linearly oscillating electric field. Our work differs in several respects...

Jaroslav Vacek; Josef Michl

2001-01-01T23:59:59.000Z

231

Electric and Magnetic Fields Induced by Deep Sea Tides  

Science Journals Connector (OSTI)

......field in the range 24 h-3 min on Christmas Island, Imperial College of Science...small compared with c, the speed of light. Therefore displacement currents...field in the range 24 h-3 min on Christmas Island, Imperial College of Scienceand......

J. C. Larsen

1968-09-01T23:59:59.000Z

232

Electric fields in plasmas under pulsed currents K. Tsigutkin,* R. Doron, E. Stambulchik, V. Bernshtam, and Y. Maron  

E-Print Network [OSTI]

Electric fields in plasmas under pulsed currents K. Tsigutkin,* R. Doron, E. Stambulchik, V Received 4 June 2007; published 3 October 2007 Electric fields in a plasma that conducts a high the region between two coaxial electrodes. The electric field is determined using laser spectroscopy and line

Doron, Ramy

233

Large electric field induced strains in ferroelectric islands J. X. Zhang, G. Sheng, and L. Q. Chen  

E-Print Network [OSTI]

Large electric field induced strains in ferroelectric islands J. X. Zhang, G. Sheng, and L. Q. Chen electric field induced strains in ferroelectric islands J. X. Zhang,a G. Sheng, and L. Q. Chen Department mechanism that generates large recoverable electric field induced strains in ferroelectric islands

Chen, Long-Qing

234

Field Labeling to Ensure the Electrical Safety of Production Equipment  

E-Print Network [OSTI]

not including equipment that is designed for use in hazardous locations. This publication provides compressive information on how to apply electrical components, wiring and control systems to both ensure safety of personnel and aid in the delivery..., by delivering safe products at a reasonable price a company will not be eliminated as a potential equipment supplier by being viewed in a negative light as a result of a poor safety evaluation. OSHA posts information on their website detailing the number...

Mills, Todd

2012-05-11T23:59:59.000Z

235

Measuring axial pump thrust  

DOE Patents [OSTI]

An apparatus for measuring the hydraulic axial thrust of a pump under operation conditions is disclosed. The axial thrust is determined by forcing the rotating impeller off of an associated thrust bearing by use of an elongate rod extending coaxially with the pump shaft. The elongate rod contacts an impeller retainer bolt where a bearing is provided. Suitable measuring devices measure when the rod moves to force the impeller off of the associated thrust bearing and the axial force exerted on the rod at that time. The elongate rod is preferably provided in a housing with a heat dissipation mechanism whereby the hot fluid does not affect the measuring devices. 1 fig.

Suchoza, B.P.; Becse, I.

1988-11-08T23:59:59.000Z

236

National High Magnetic Field Laboratory: Museum of Electricity...  

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

of the composition of light. Light, of course, is a form of energy. A magnetic field changes the behavior of light - a phenomenon known as the Zeeman effect. The Zeeman...

237

National High Magnetic Field Laboratory: Museum of Electricity...  

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

it lacked sophistication, he was able to use the model to formulate his own law of magnetism. Magnetometers are used in many different fields; they are used in geophysics,...

238

Electric Field-Induced Skyrmion Crystals via Charged Monopoles in Insulating Helimagets  

E-Print Network [OSTI]

Electrons propagating in a magnetically ordered medium experience an additional gauge field associated with the Berry phase of their spin following the local magnetic texture. In contrast to the usual electromagnetic field, this gauge field admits monopole excitations, corresponding to hedgehog defects of the magnetic order. In an insulator, these hedgehogs carry a well-defined electric charge allowing for them to be controlled by electric fields. One particularly robust mechanism that contributes to the charge is the orbital magnetoelectric effect, captured by a $\\theta$ angle, which leads to a charge of $e\\theta/2\\pi$ on hedgehogs. This is a direct consequence of the Witten effect for magnetic monopoles in a $\\theta$ medium. A physical consequence is that external electric fields can induce skyrmion crystal phases in insulating helimagnets.

Watanabe, Haruki

2014-01-01T23:59:59.000Z

239

Electric Field-Induced Skyrmion Crystals via Charged Monopoles in Insulating Helimagets  

E-Print Network [OSTI]

Electrons propagating in a magnetically ordered medium experience an additional gauge field associated with the Berry phase of their spin following the local magnetic texture. In contrast to the usual electromagnetic field, this gauge field admits monopole excitations, corresponding to hedgehog defects of the magnetic order. In an insulator, these hedgehogs carry a well-defined electric charge allowing for them to be controlled by electric fields. One particularly robust mechanism that contributes to the charge is the orbital magnetoelectric effect, captured by a $\\theta$ angle, which leads to a charge of $e\\theta/2\\pi$ on hedgehogs. This is a direct consequence of the Witten effect for magnetic monopoles in a $\\theta$ medium. A physical consequence is that external electric fields can induce skyrmion crystal phases in insulating helimagnets.

Haruki Watanabe; Ashvin Vishwanath

2014-10-08T23:59:59.000Z

240

Energy Spectrum of the Electrons Accelerated by a Reconnection Electric Field: Exponential or Power Law?  

E-Print Network [OSTI]

The direct current (DC) electric field near the reconnection region has been proposed as an effective mechanism to accelerate protons and electrons in solar flares. A power-law energy spectrum was generally claimed in the simulations of electron acceleration by the reconnection electric field. However in most of the literature, the electric and magnetic fields were chosen independently. In this paper, we perform test-particle simulations of electron acceleration in a reconnecting magnetic field, where both the electric and magnetic fields are adopted from numerical simulations of the MHD equations. It is found that the accelerated electrons present a truncated power-law energy spectrum with an exponential tail at high energies, which is analogous to the case of diffusive shock acceleration. The influences of reconnection parameters on the spectral feature are also investigated, such as the longitudinal and transverse components of the magnetic field and the size of the current sheet. It is suggested that the DC electric field alone might not be able to reproduce the observed single or double power-law distributions.

W. J. Liu; P. F. Chen; M. D. Ding; C. Fang

2008-09-07T23:59:59.000Z

Note: This page contains sample records for the topic "axial electric field" 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

Axial static mixer  

DOE Patents [OSTI]

Static axial mixing apparatus includes a plurality of channels, forming flow paths of different dimensions. The axial mixer includes a flow adjusting device for adjustable selective control of flow resistance of various flow paths in order to provide substantially identical flows through the various channels, thereby reducing nonuniform coating of interior surfaces of the channels. The flow adjusting device may include diaphragm valves, and may further include a pressure regulating system therefor.

Sandrock, H.E.

1982-05-06T23:59:59.000Z

242

Directional properties of polar paramagnetic molecules subject to congruent electric, magnetic and optical fields  

E-Print Network [OSTI]

We show that congruent electric, magnetic and non-resonant optical fields acting concurrently on a polar paramagnetic (and polarisable) molecule offer possibilities to both amplify and control the directionality of the ensuing molecular states that surpass those available in double-field combinations or in single fields alone. At the core of these triple-field effects is the lifting of the degeneracy of the projection quantum number $M$ by the magnetic field superimposed on the optical field and a subsequent coupling of the members of the "doubled" (for states with $M \

Sharma, Ketan

2015-01-01T23:59:59.000Z

243

-561 -105Pl LIGHTNING ELECTRIC AND MAGNETIC FIELDS  

E-Print Network [OSTI]

-scale pulse structure of naturally-occurring negative ground discharges, as observed at ground, includes in the valida- tion of lightning models. Table 1 summarizes essentially all identifiable lightning radiation field signatures as recorded at ground. Note that apparently there is no characteristic radiation pulse

Florida, University of

244

The conditions for the existence of the electric field opposite to the current along the magnetic field lines in the thin plasma  

Science Journals Connector (OSTI)

The flow of the current along the magnetic field lines in the thin plasma directed opposite to the electric field is considered. The particles moving to the ... current density which are typical for the auroral field

M. V. Samokhin

245

Ionization of many-electron atoms by a quasistatic electric field Dimitri Fisher and Yitzhak Maron  

E-Print Network [OSTI]

Ionization of many-electron atoms by a quasistatic electric field Dimitri Fisher and Yitzhak Maron 1997 We present a general expression for the field ionization probability of atoms and ions under electron in the outer nl subshell, the expression obtained here is applicable to atoms and ions with any

246

The development of the time dependence of the nuclear EMP electric field  

SciTech Connect (OSTI)

The nuclear electromagnetic pulse (EMP) electric field calculated with the legacy code CHAP is compared with the field given by an integral solution of Maxwell's equations, also known as the Jefimenko equation, to aid our current understanding on the factors that affect the time dependence of the EMP. For a fair comparison the CHAP current density is used as a source in the Jefimenko equation. At first, the comparison is simplified by neglecting the conduction current and replacing the standard atmosphere with a constant density air slab. The simplicity of the resultant current density aids in determining the factors that affect the rise, peak and tail of the EMP electric field versus time. The three dimensional nature of the radiating source, i.e. sources off the line-of-sight, and the time dependence of the derivative of the current density with respect to time are found to play significant roles in shaping the EMP electric field time dependence. These results are found to hold even when the conduction current and the standard atmosphere are properly accounted for. Comparison of the CHAP electric field with the Jefimenko electric field offers a direct validation of the high-frequency/outgoing wave approximation.

Eng, C

2009-10-30T23:59:59.000Z

247

Application of an Electric Field to Colloidal Particles Suspended in a Liquid-Crystal Solvent  

Science Journals Connector (OSTI)

We study the behavior of colloidal particles suspended in a thermotropic nematic solvent in the presence of an electric field. For normal boundary conditions of the nematic director at the particles' surface, we show experimentally that an electric field applied along the dipolar axis of an elastic dipole induces a transition to an elastic quadrupolar configuration. Turning the field off makes the system go back to the initial state. We also show that it is possible to directly evidence an elastic quadrupolar repulsion between droplets.

J. C. Loudet and P. Poulin

2001-09-27T23:59:59.000Z

248

Simulation of a small molecule analogue of a lithium ionomer in an external electric field  

SciTech Connect (OSTI)

We have investigated the ion dynamics in lithium-neutralized 2-pentylheptanoic acid, a small molecule analogue of a precise poly(ethylene-co-acrylic acid) lithium ionomer. Atomistic molecular dynamics simulations were performed in an external electric field. The electric field causes alignment of the ionic aggregates along the field direction. The energetic response of the system to an imposed oscillating electric field for a wide range of frequencies was tracked by monitoring the coulombic contribution to the energy. The susceptibility found in this manner is a component of the dielectric susceptibility typically measured experimentally. A dynamic transition is found and the frequency associated with this transition varies with temperature in an Arrhenius manner. The transition is observed to be associated with rearrangements of the ionic aggregates.

Waters, Sara M.; McCoy, John D., E-mail: mccoy@nmt.edu; Brown, Jonathan R. [Department of Materials Engineering, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801 (United States)] [Department of Materials Engineering, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801 (United States); Frischknecht, Amalie L. [Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)] [Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

2014-01-07T23:59:59.000Z

249

Dynamics of the fast component of nano-confined water under electric field  

SciTech Connect (OSTI)

We report the diffusion of water molecules confined in the pores of folded silica materials (FSM-12 with average pore diameter of $\\sim$ 16 \\AA), measured by means of quasielastic neutron scattering using the cold neutron chopper spectrometer (CNCS). The goal is to investigate the effect of electric field on the previously observed fast component of nano-confined water. The measurements were taken at temperatures between 220 K and 245 K, and at two electric field values, 0 kV/mm and 2 kV/mm. Similar to the recently observed electric field induced enhancement of the slow translational motion of confined water, there is a an equally important impact of the field on the faster diffusion.

Omar Diallo, Souleymane [ORNL; Mamontov, Eugene [ORNL; Podlesnyak, Andrey A [ORNL; Ehlers, Georg [ORNL; Wada, Nobuo [Nagoya University, Japan; Inagaki, S [Toyota Central Research and Development Labs. Inc.; Fukushima, Y [Toyota Central Research and Development Labs. Inc.

2013-01-01T23:59:59.000Z

250

Observation of transient electric fields in particle-in-cell simulation of capacitively coupled discharges  

SciTech Connect (OSTI)

The analytical prediction of the presence of transient electric field regions between the bulk plasma and sheath edge in radio frequency capacitively coupled plasma (RF-CCP) discharges has been reported by Kaganovich [Phys. Rev. Lett. 89, 265006 (2002)]. In this paper, we have used the semi-infinite particle-in-cell (PIC) simulation technique to verify the theoretical prediction for the existence of transient electric field in the linear regime; it is shown that the PIC simulation results are in good agreement with the results predicted by analytical model in this regime. It is also demonstrated that the linear theory overestimates the transient electric field as one moves from linear to weakly nonlinear regime. The effect of applied RF current density and electron temperature on evolution of transition field and phase mixing regime has been explored.

Sharma, S., E-mail: sarvsarvesh@gmail.com; Mishra, S. K.; Kaw, Predhiman K. [Institute for Plasma Research (IPR), Bhat, Gandhinagar 382428 (India)

2014-07-15T23:59:59.000Z

251

Accounting for spatially variable resolution in electrical resistivity tomography through field-scale rock-physics relations  

E-Print Network [OSTI]

Accounting for spatially variable resolution in electrical resistivity tomography through field of the voltages measured in an electrical resistivity tomography ERT survey produces maps of electrical resistivity, which can be used to infer changes in electrical properties, such as those caused

Singha, Kamini

252

Electric dipole moment searches: Effect of linear electric field frequency shifts induced in confined gases, II  

E-Print Network [OSTI]

The next generation of particle edm searches will be at such a high sensitivity that it will be possible for the results to be contaminated by a systematic error resulting from the interaction of the motional (E x v/c) magnetic field with stray field gradients. In this paper we extend previous work to present an analytic form for the frequency shift in the case of a rectangular storage vessel and discuss the implications of the result for the neutron edm experiment which will be installed at the SNS (Spallation Neutron Source) by the LANL collaboration

R. Golub; C. M. Swank; S. K. Lamoreaux

2009-06-03T23:59:59.000Z

253

Standstill Electric Charge Generates Magnetostatic Field Under Born-Infeld Electrodynamics  

E-Print Network [OSTI]

The Abelian Born-Infeld classical non-linear electrodynamic has been used to investigate the electric and magnetostatic fields generated by a point-like electrical charge at rest in an inertial frame. The results show a rich internal structure for the charge. Analytical solutions have also been found. Such findings have been interpreted in terms of vacuum polarization and magnetic-like charges produced by the very high strengths of the electric field considered. Apparently non-linearity is to be accounted for the emergence of an anomalous magnetostatic field suggesting a possible connection to that created by a magnetic dipole composed of two mognetic charges with opposite signals. Consistently in situations where the Born-Infeld field strength parameter is free to become infinite, Maxwell`s regime takes over, the magnetic sector vanishes and the electric field assumes a Coulomb behavior with no trace of a magnetic component. The connection to other monopole solutions, like Dirac`s, t' Hooft`s or Poliakov`s types, are also discussed. Finally some speculative remarks are presented in an attempt to explain such fields.

S. O. Vellozo; Jose A. Helayel-Neto; A. W. Smith; L. P. G. De Assis

2008-02-21T23:59:59.000Z

254

Internal Electric Field Behavior of Cadmium Zinc Telluride Radiation Detectors Under High Carrier Injection  

SciTech Connect (OSTI)

The behavior of the internal electric-field of nuclear-radiation detectors substantially affects the detector's performance. We investigated the distribution of the internal field in cadmium zinc telluride (CZT) detectors under high carrier injection. We noted the build-up of a space charge region near the cathode that produces a built-in field opposing the applied field. Its presence entails the collapse of the electric field in the rest of detector, other than the portion near the cathode. Such a space-charge region originates from serious hole-trapping in CZT. The device's operating temperature greatly affects the width of the space-charge region. With increasing temperature from 5 C to 35 C, its width expanded from about 1/6 to 1/2 of the total depth of the detector.

Yang, G.; Bolotnikov, A.E.; Camarda, G.S.; Cui, Y.; Hossain, A.; Kim, K.H.; Gul, R.; and James, R.B.

2010-10-26T23:59:59.000Z

255

Resistance of Thin Metal Films Grown under a Longitudinal Electric Field  

Science Journals Connector (OSTI)

Thin?film samples of platinum silver and gold were prepared in pairs on glass substrates by evaporation in a vacuum of 10?6?10?7 Torr one sample of the pair under an electric field (usually 40 V/cm either dc or 500?Hz square wave) applied along the substrate surface and the other sample under no field. Sample resistances were measured in the vacuum at temperatures ranging from roughly 0 °C to 4 °K. The resistances of the samples deposited under a field were almost invariably lower sometimes by orders of magnitude than those of the corresponding samples grown under no field. Electron micrographs show that the former samples had elongated and interconnected grains while the latter samples had roundish and more islolated grains. The data are discussed in terms of a simple model based on the notion that the film particles polarize stretch and even coalesce under the applied electric field before they solidify.

E. Ahilea; A. A. Hirsch

1971-01-01T23:59:59.000Z

256

Neoclassical Drift of Circulating Orbits Due toToroidal Electric Field in Tokamaks  

SciTech Connect (OSTI)

In tokamaks, Ware pinch is a well known neoclassical effect for trapped particles in response to a toroidal electric field. It is generally believed that there exists no similar neoclassical effect for circulating particles without collisions. However, this belief is erroneous, and misses an important effect. We show both analytically and numerically that under the influence of a toroidal electric field parallel to the current, the circulating orbits drift outward toward the outer wall with a characteristic velocity O ({var_epsilon}{sup -1}) larger than the E x B velocity, where {var_epsilon} is the inverse aspect-ratio of a tokamak. During a RF overdrive, the toroidal electric field is anti-parallel to the current. As a consequence, all charged particles, including backward runaway electrons, will drift inward towards the inner wall.

Hong, Qin, Xiaoyin Guan and Nathaniel J. Fisch

2011-07-19T23:59:59.000Z

257

Electric field induced structuring in clay–oil suspensions: new insights from WAXS, SEM,  

Science Journals Connector (OSTI)

The electric field induced structuring in clay–oil suspensions has been studied by means of wide angle x-ray scattering (WAXS), rheometry, scanning electron microscopy (SEM), as well as leak current density and dielectric constant measurements. The clay particles' orientation distribution was inferred from the azimuthal changes of the clay diffraction peak intensity. The angular width of that distribution was quantified through an orientational order parameter. Chain and column formation processes were distinguished by comparison of the time evolution of the diffraction peak amplitude with that of the current density. Leak current density was measured for different electric field strengths E and clay particle concentrations ?. The following scaling relation was found: . In addition, the dependence of the yield stress on the electric field and on the particle concentration was measured and shown to scale as: .

Z Rozynek; K D Knudsen; J O Fossum; Y Méheust; B Wang; M Zhou

2010-01-01T23:59:59.000Z

258

Diagnosis of Magnetic and Electric Fields of Chromospheric Jets through Spectropolarimetric Observations of HI Paschen Lines  

E-Print Network [OSTI]

Magnetic fields govern the plasma dynamics in the outer layers of the solar atmosphere, and electric fields acting on neutral atoms that move across the magnetic field enable us to study the dynamical coupling between neutrals and ions in the plasma. In order to measure the magnetic and electric fields of chromospheric jets, the full Stokes spectra of the Paschen series of neutral hydrogen in a surge and in some active region jets that took place at the solar limb were observed on May 5, 2012, using the spectropolarimeter of the Domeless Solar Telescope at Hida observatory, Japan. First, we inverted the Stokes spectra taking into account only the effect of magnetic fields on the energy structure and polarization of the hydrogen levels. Having found no definitive evidence of the effects of electric fields in the observed Stokes profiles, we then estimated an upper bound for these fields by calculating the polarization degree under the magnetic field configuration derived in the first step, with the additional ...

Anan, Tetsu; Ichimoto, Kiyoshi

2014-01-01T23:59:59.000Z

259

Comparison of coupling of humans to electric and magnetic fields with frequencies between 100 Hz and 100 kHz  

SciTech Connect (OSTI)

Recent laboratory and epidemiological results have stimulated interest in the hypothesis that human beings may exhibit biological responses to magnetic and/or electric field transients with frequencies in the range between 100 Hz and 100 kHz. Much can be learned about the response of a system to a transient stimulation by understanding its response to sinusoidal disturbances over the entire frequency range of interest. Thus, the main effort of this paper was to compare the strengths of the electric fields induced in homogeneous ellipsoidal models by uniform 100 Hz through 100 kHz electric and magnetic fields. Over this frequency range, external electric fields of about 25--2,000 V/m (depending primarily on the orientation of the body relative to the field) are required to induce electric fields inside models of adults and children that are similar in strength to those induced by an external 1 {mu}T magnetic field. Additional analysis indicates that electric fields induced by uniform external electric and magnetic fields and by the nonuniform electric and magnetic fields produced by idealized point sources will not differ by more than a factor of two until the sources are brought close to the body. Published data on electric and magnetic field transients in residential environments indicate that, for most field orientations, the magnetic component will induce stronger electric fields inside adults and children than the electric component. This conclusion is also true for the currents induced in humans by typical levels of 60 Hz electric and magnetic fields in US residences.

Kaune, W.T. [EM Factors, Richland, WA (United States)] [EM Factors, Richland, WA (United States); Guttman, J.L. [Enertech Consultants, Campbell, CA (United States)] [Enertech Consultants, Campbell, CA (United States); Kavet, R. [Electric Power Research Inst., Palo Alto, CA (United States)] [Electric Power Research Inst., Palo Alto, CA (United States)

1997-03-01T23:59:59.000Z

260

Effect of Radial-Electric-Field Polarity on Wire-Array Z-Pinch Dynamics  

SciTech Connect (OSTI)

The formation of plasma in wire-array Z-pinch experiments was found to depend upon the polarity of the radial-electric field near the wires. Reversing the radial-electric field midway along the length of an array resulted in the ablation rate of one-half of the array being reduced by 50%, significantly delaying the start of its implosion and altering its acceleration towards the axis. The observed phenomena cannot be explained by the standard magnetohydrodynamic models of array behavior, suggesting that effects such as electron emission may be important, especially during wire initiation.

Bland, S.N.; Lebedev, S.V.; Chittenden, J.P.; Ampleford, D.J.; Bott, S.C.; Haines, M.G.; Hall, G.N.; Palmer, J.B.A. [Imperial College, Blackett Laboratory, Prince Consort Road, London SW7 2BZ (United Kingdom); Gomez, J.A.; Mitchell, I.H. [Pontificia Universidad Catolica de Chile, Avenida Vicuna Mackenna 4860, Santiago (Chile); Hammer, D.A. [Laboratory of Plasma Studies, Cornell University, Ithaca, New York (United States)

2005-09-23T23:59:59.000Z

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


261

A tunable metamaterial dependent on electric field at terahertz with barium strontium titanate thin film  

SciTech Connect (OSTI)

A tunable metamaterial with resonance frequency at terahertz (THz) was developed. Electromagnetic response of the metamaterial was characterized with THz time domain spectrometer at various direct current electric fields. The resonance frequency increased monotonously with increasing electric field. The finite difference time domain method was used to simulate the transmission spectra of the metamaterial at THz frequencies. By comparing the simulated resonance frequency with the experimental curve, dielectric property of the Ba{sub 0.6}Sr{sub 0.4}TiO{sub 3} (BST60) thin film at THz, over 0–33?kV/cm, was evaluated.

Bian, Yanlong; Zhai, Jiwei, E-mail: apzhai@tongji.edu.cn [Function Materials Research Laboratory, Tongji University, Shanghai 200092 (China); Wu, Chao; Li, Hongqiang [Department of Physics Science and Engineering, Tongji University, Shanghai 200092 (China)

2014-01-27T23:59:59.000Z

262

Influence of Disorder on Conductance in Bilayer Graphene under Perpendicular Electric Field  

Science Journals Connector (OSTI)

Steep increase of the resistance is observed under high electric field; however, the resistance does not diverge even at low temperatures. ... Here, from the elementary electrostatics, the electric field is given by E = {(Vtg ? Vtg0) ? (Vbg ? Vbg0)}/{(?0/?b)db + dgr + (?0/?t)dt}, where Vtg0 and Vbg0 are the gate voltages that give the minimum resistance on the diagonal ridge line, corresponding to E = 0, and dgr is the thickness of the bilayer graphene, which is negligible in the expression for our device structure. ...

Hisao Miyazaki; Kazuhito Tsukagoshi; Akinobu Kanda; Minoru Otani; Susumu Okada

2010-08-30T23:59:59.000Z

263

Energy loss of ions by electric-field fluctuations in a magnetized plasma  

SciTech Connect (OSTI)

The results of a theoretical investigation of the energy loss of charged particles in a magnetized classical plasma due to the electric-field fluctuations are reported. The energy loss for a test particle is calculated through the linear-response theory. At vanishing magnetic field, the electric-field fluctuations lead to an energy gain of the charged particle for all velocities. It has been shown that in the presence of strong magnetic field, this effect occurs only at low velocities. In the case of high velocities, the test particle systematically loses its energy due to the interaction with a stochastic electric field. The net effect of the fluctuations is the systematic reduction of the total energy loss (i.e., the sum of the polarization and stochastic energy losses) at vanishing magnetic field and reduction or enhancement at strong field, depending on the velocity of the particle. It is found that the energy loss of the slow heavy ion contains an anomalous term that depends logarithmically on the projectile mass. The physical origin of this anomalous term is the coupling between the cyclotron motion of the plasma electrons and the long-wavelength, low-frequency fluctuations produced by the projectile ion. This effect may strongly enhance the stochastic energy gain of the particle.

Nersisyan, Hrachya B. [Institute of Radiophysics and Electronics, 0203 Ashtarak (Armenia); Centre of Strong Fields Physics, Yerevan State University, Alex Manoogian str. 1, 0025 Yerevan (Armenia); Deutsch, Claude [LPGP - UMR-CNRS 8578, Universite Paris XI, F-91405 Orsay (France)

2011-06-15T23:59:59.000Z

264

Electric-field-induced plasmon in AA-stacked bilayer graphene  

SciTech Connect (OSTI)

The collective excitations in AA-stacked bilayer graphene for a perpendicular electric field are investigated analytically within the tight-binding model and the random-phase approximation. Such a field destroys the uniform probability distribution of the four sublattices. This drives a symmetry breaking between the intralayer and interlayer polarization intensities from the intrapair band excitations. A field-induced acoustic plasmon thus emerges in addition to the strongly field-tunable intrinsic acoustic and optical plasmons. At long wavelengths, the three modes show different dispersions and field dependence. The definite physical mechanism of the electrically inducible and tunable mode can be expected to also be present in other AA-stacked few-layer graphenes. -- Highlights: •The analytical derivations are performed by the tight-binding model. •An electric field drives the non-uniformity of the charge distribution. •A symmetry breaking between the intralayer and interlayer polarizations is illustrated. •An extra plasmon emerges besides two intrinsic modes in AA-stacked bilayer graphene. •The mechanism of a field-induced mode is present in AA-stacked few-layer graphenes.

Chuang, Y.C., E-mail: yingchih.chuang@gmail.com; Wu, J.Y., E-mail: yarst5@gmail.com; Lin, M.F., E-mail: mflin@mail.ncku.edu.tw

2013-12-15T23:59:59.000Z

265

Electric field and temperature measurement using ultra wide bandwidth pigtailed electro-optic probes  

E-Print Network [OSTI]

1 Electric field and temperature measurement using ultra wide bandwidth pigtailed electro bandwidth from kHz to tens of GHz with a sensitivity of 0.7 V.m-1 .Hz-1/2 and a temperature accuracy of 40 mK.1364/AO.47.002470 #12;2 Introduction In the field of high power microwave (HPM) measurements, ultra wide

Boyer, Edmond

266

Method of measuring the dc electric field and other tokamak parameters  

DOE Patents [OSTI]

A method including externally imposing an impulsive momentum-space flux to perturb hot tokamak electrons thereby producing a transient synchrotron radiation signal, in frequency-time space, and the inference, using very fast algorithms, of plasma parameters including the effective ion charge state Z.sub.eff, the direction of the magnetic field, and the position and width in velocity space of the impulsive momentum-space flux, and, in particular, the dc toroidal electric field.

Fisch, Nathaniel J. (Princeton, NJ); Kirtz, Arnold H. (Princeton Junction, NJ)

1992-01-01T23:59:59.000Z

267

Field-theory calculation of the electric dipole moment of the neutron and paramagnetic atoms  

E-Print Network [OSTI]

Electric dipole moments (edms) of bound states that arise from the constituents having edms are studied with field-theoretic techniques. The systems treated are the neutron and a set of paramagnetic atoms. In the latter case it is well known that the atomic edm differs greatly from the electron edm when the internal electric fields of the atom are taken into account. In the nonrelativistic limit these fields lead to a complete suppression, but for heavy atoms large enhancement factors are present. A general bound-state field theory approach applicable to both the neutron and paramagnetic atoms is set up. It is applied first to the neutron, treating the quarks as moving freely in a confining spherical well. It is shown that the effect of internal electric fields is small in this case. The atomic problem is then revisited using field-theory techniques in place of the usual Hamiltonian methods, and the atomic enhancement factor is shown to be consistent with previous calculations. Possible application of bound-state techniques to other sources of the neutron edm is discussed.

S. A. Blundell; J. Griffith; J. Sapirstein

2012-05-10T23:59:59.000Z

268

Linear electric field frequency shift (important for next generation electric dipole moment searches) induced in confined gases by a magnetic field gradient  

E-Print Network [OSTI]

The search for particle electric dipole moments (edm) represents a most promising way to search for physics beyond the standard model. A number of groups are planning a new generation of experiments using stored gases of various kinds. In order to achieve the target sensitivities it will be necessary to deal with the systematic error resulting from the interaction of the well-known $\\overrightarrow{v}\\times \\overrightarrow{E}$ field with magnetic field gradients (often referred to as the geometric phase effect (Commins, ED; Am. J. Phys. \\QTR{bf}{59}, 1077 (1991), Pendlebury, JM \\QTR{em}{et al;} Phys. Rev. \\QTR{bf}{A70}, 032102 (2004)). This interaction produces a frequency shift linear in the electric field, mimicking an edm. In this work we introduce an analytic form for the velocity auto-correlation function which determines the velocity-position correlation function which in turn determines the behavior of the frequency shift (Lamoreaux, SK and Golub, R; Phys. Rev \\QTR{bf}{A71}, 032104 (2005)) and show how it depends on the operating conditions of the experiment. We also discuss some additional issues.

Authors A. L. Barabanov; R. Golub; S. K. Lamoreaux

2006-07-17T23:59:59.000Z

269

Single-Molecule Microscopy Studies of Electric-Field Poling in Chromophore-Polymer Composite Materials  

E-Print Network [OSTI]

Single-Molecule Microscopy Studies of Electric-Field Poling in Chromophore-Polymer Composite electrooptic devices based on chromophore-polymer composite materials is to improve chromophore ordering of susceptibility.16 Chromophore-polymer composite materials lack inherent non- centrosymmetry, which is required

Reid, Philip J.

270

Particle acceleration and radiation by direct electric fields in flaring complex solar active regions  

E-Print Network [OSTI]

to connect the energy re- lease process with the acceleration of electrons in solar flares, using a CA modelParticle acceleration and radiation by direct electric fields in flaring complex solar active-Meudon, 92195 Meudon Cedex, FRANCE Abstract The acceleration and radiation of solar energetic particles

Anastasiadis, Anastasios

271

Electric field manipulation of polymer nanocomposites: processing and investigation of their physical characteristics  

E-Print Network [OSTI]

is to achieve a good homogenous dispersion of carbon nanofibers (CNFs) and single wall carbon nanotubes (SWNTs) in the polymer matrix; the second step is to manipulate the well-dispersed CNFs and SWNTs in polymers by using an AC electric field. Different...

Banda, Sumanth

2009-05-15T23:59:59.000Z

272

Electric Field Modulation of the Membrane Potential in Solid-State Ion Channels  

E-Print Network [OSTI]

channel. KEYWORDS: Nanochannel, membrane potential, electrofluidic gating, ion transport, salinityElectric Field Modulation of the Membrane Potential in Solid-State Ion Channels Weihua Guan a rapid flow of ions across the cell membrane. Normal physiological functions, such as generating action

Reed, Mark

273

Electrical Conductivity of Dense Quark Matter with Fluctuations and Magnetic Field Included  

E-Print Network [OSTI]

We investigate the electrical conductivity(EC) of dense quark matter in the vicinity of the phase transition line. We show that: (i) At high density the Drude EC does not depend on the magnetic field up to $eB \\sim 10^{19} \\ G$. (ii) In the precritical region the fluctuation EC (paraconductivity) dominates over the Drude one.

B. O. Kerbikov; M. A. Andreichikov

2014-10-13T23:59:59.000Z

274

Assessing the wind field over the continental shelf as a resource for electric power  

E-Print Network [OSTI]

for the comparison period) that the near-coast phase advantage is obviated. We also find more consistent wind powerAssessing the wind field over the continental shelf as a resource for electric power by Richard W. Garvine1,2 and Willett Kempton1,3,4 ABSTRACT To assess the wind power resources of a large continental

Firestone, Jeremy

275

Ion-trap measurements of electric-field noise near surfaces  

E-Print Network [OSTI]

Electric-field noise near surfaces is a common problem in diverse areas of physics, and a limiting factor for many precision measurements. There are multiple mechanisms by which such noise is generated, many of which are poorly understood. Laser-cooled, trapped ions provide one of the most sensitive systems to probe electric-field noise at MHz frequencies and over a distance range 30 - 3000 $\\mu$m from the surface. Over recent years numerous experiments have reported spectral densities of electric-field noise inferred from ion heating-rate measurements and several different theoretical explanations for the observed noise characteristics have been proposed. This paper provides an extensive summary and critical review of electric-field noise measurements in ion traps, and compares these experimental findings with known and conjectured mechanisms for the origin of this noise. This reveals that the presence of multiple noise sources, as well as the different scalings added by geometrical considerations, complicate the interpretation of these results. It is thus the purpose of this review to assess which conclusions can be reasonably drawn from the existing data, and which important questions are still open. In so doing it provides a framework for future investigations of surface-noise processes.

M. Brownnutt; M. Kumph; P. Rabl; R. Blatt

2014-09-23T23:59:59.000Z

276

Ab initio calculation of the temperature dependence of the electric field gradient in Be  

Science Journals Connector (OSTI)

Using the orthogonalized-plane-wave procedure, the band structure, Fermi surface, and conduction-electron wave functions of Be have been calculated as a function of temperature. The electric field gradients calculated from first principles obey the T32 behavior and are negative throughout the temperature range studied.

P. Jena and J. Rath

1981-04-15T23:59:59.000Z

277

SOLAR WIND ELECTRIC FIELDS IN THE ION CYCLOTRON FREQUENCY RANGE P. J. Kellogg,1  

E-Print Network [OSTI]

SOLAR WIND ELECTRIC FIELDS IN THE ION CYCLOTRON FREQUENCY RANGE P. J. Kellogg,1 S. D. Bale,2 F. S wind in the region near the ion cyclotron frequency of protons, larger than the force due to magnetic fluctuations. They provide sufficient velocity- space diffusion or heating to counteract conservation

California at Berkeley, University of

278

Direct and indirect excitons in semiconductor coupled quantum wells in an applied electric field  

Science Journals Connector (OSTI)

An accurate calculation of the exciton ground and excited states in AlGaAs and InGaAs coupled quantum wells (CQWs) in an external electric field is presented. An efficient and straightforward algorithm of solving the Schrödinger equation in real space has been developed and exciton binding energies, oscillator strengths, lifetimes, and absorption spectra are calculated for applied electric fields up to 100 kV/cm. It is found that in a symmetric 8–4–8-nm GaAs/Al0.33Ga0.67As CQW structure, the ground state of the system switches from direct to indirect exciton at approximately 5 kV/cm with dramatic changes of its binding energy and oscillator strength while the bright excited direct-exciton state remains almost unaffected. It is shown that the excitonic lifetime is dominated either by the radiative recombination or by tunneling processes at small/large values of the electric field, respectively. The calculated lifetime of the exciton ground state as a function of the bias voltage is in a quantitative agreement with low-temperature photoluminescence measurements. We have also made freely available a numerical code for calculation of the optical properties of direct and indirect excitons in CQWs in an electric field.

K. Sivalertporn, L. Mouchliadis, A. L. Ivanov, R. Philp, and E. A. Muljarov

2012-01-17T23:59:59.000Z

279

Real-time formalism for studying the nonlinear response of "smart" materials to an electric field  

E-Print Network [OSTI]

Real-time formalism for studying the nonlinear response of "smart" materials to an electric field J developed for so-called "smart" materials that are tuned to lie close to the metal- insulator transition (RSFQ) ideas [3]. A "smart" material is a mate- rial that can have its properties altered by changing

Freericks, Jim

280

Phase-separation in ion-containing mixtures in electric fields  

E-Print Network [OSTI]

When a liquid mixture is subjected to external electric fields, ionic screening leads to field gradients. We point out that if the mixture is initially in the homogeneous phase, this screening can bring about a robust phase-separation transition with two main features: (i) the phase separation is expected to occur in any electrode geometry, and (ii) the voltage required is typically of the order of 1 V and even less. We discuss several applications of the effect relevant to the field of microfluidics, focusing on the creation of a nanometer-scale lubrication layer in the phase-separation process.

Yoav Tsori; Ludwik Leibler

2007-03-26T23:59:59.000Z

Note: This page contains sample records for the topic "axial electric field" 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

Electric-field-dependent average resistance and the resistance fluctuation in one-dimensional disordered systems  

Science Journals Connector (OSTI)

Following an invariant-imbedding approach, we obtain analytical expressions for the ensemble-averaged resistance (?) and its Sinai’s fluctuations for a one-dimensional disordered conductor in the presence of a finite electric field F. The mean resistance shows a crossover from the exponential to the power-law length dependence with increasing field strength in agreement with known numerical results. More importantly, unlike the zero-field case the resistance distribution saturates to a Poissonian-limiting form proportional to A?F?exp(-A?F??) for large sample lengths, where A is constant.

G. V. Vijayagovindan, A. M. Jayannavar, and N. Kumar

1987-02-01T23:59:59.000Z

282

Terahertz radiation and second-harmonic generation from InAs: Bulk versus surface electric-field-induced contributions  

E-Print Network [OSTI]

Terahertz radiation and second-harmonic generation from InAs: Bulk versus surface electric-harmonic generation and terahertz radiation emission indicates that the observed dominant surface electric-field-induced contributions Matthew Reid, Igor V. Cravetchi, and Robert Fedosejevs Department of Electrical and Computer

Reid, Matthew

283

Electric-Field-Induced Resistive Switching in a Family of Mott Insulators : towards Non-Volatile Mott-RRAM Memories  

E-Print Network [OSTI]

1 Electric-Field-Induced Resistive Switching in a Family of Mott Insulators : towards Non of electrical resistance by electrostatic charging. Flash memories could soon reach their miniaturization limits difficult [1] . The control of electrical resistance at the nanometer scale therefore requires new concepts

Paris-Sud XI, Université de

284

Local CP-violation and electric charge separation by magnetic fields from lattice QCD  

E-Print Network [OSTI]

We study local CP-violation on the lattice by measuring the local correlation between the topological charge density and the electric dipole moment of quarks, induced by a constant external magnetic field. This correlator is found to increase linearly with the external field, with the coefficient of proportionality depending only weakly on temperature. Results are obtained on lattices with various spacings, and are extrapolated to the continuum limit after the renormalization of the observables is carried out. This renormalization utilizes the gradient flow for the quark and gluon fields. Our findings suggest that the strength of local CP-violation in QCD with physical quark masses is about an order of magnitude smaller than a model prediction based on nearly massless quarks in domains of constant gluon backgrounds with topological charge. We also show numerical evidence that the observed local CP-violation correlates with spatially extended electric dipole structures in the QCD vacuum.

G. S. Bali; F. Bruckmann; G. Endrodi; Z. Fodor; S. D. Katz; A. Schafer

2014-01-16T23:59:59.000Z

285

Cavitation nanopore in the dielectric fluid in the inhomogeneous, pulsed electric fields  

E-Print Network [OSTI]

This paper discusses the nanopores emerging and developing in a liquid dielectric under the action of the ponderomotive electrostrictive forces in a nonuniform electric field. It is shown that the gradient of the electric field in the vicinity of the rupture (cavitation nanopore) substantially increases and determines whether the rupture grows or collapses. The cavitation rupture in the liquid (nanopore) tends to stretch along the lines of the original field. The mechanism of the breakdown associated with the generation of secondary ruptures in the vicinity of the poles of the nanopore is proposed. The estimations of the extension time for nanopore in water and oil (polar and nonpolar liquids, respectively) are presented. A new mechanism of nano- and subnanosecond breakdown in the insulating (transformer) oil that can be realized in the vicinity of water microdroplets in modern nanosecond high-voltage devices is considered

M. Pekker; M. N. Shneider

2014-12-19T23:59:59.000Z

286

E-Print Network 3.0 - axial em dente Sample Search Results  

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

Tel Aviv University Collection: Engineering ; Geosciences 5 On the ordering of energy levels in homogeneous magnetic fields Summary: field and in an axially symmetric...

287

Electric and Magnetic Fields (EMF) RAPID Engineering Program, Project 7: Development of Field Exposure Models  

SciTech Connect (OSTI)

The purpose of this project was to develop a conceptual model for estimating magnetic field (EMF) personal exposure (PE) of individuals or groups and construct a working model using existing data.

Bracken, T.D.; Rankin, R.F.; Wiley, J.A.

1999-05-01T23:59:59.000Z

288

The Axially Symmetric One?Monopole  

Science Journals Connector (OSTI)

We present new classical generalized one?monopole solution of the SU(2) Yang?Mills?Higgs theory with the Higgs field in the adjoint representation. We show that this solution with ??winding number m?=?1 and ??winding number n?=?1 is an axially symmetric generalization of the ’t Hooft?Polyakov one?monopole. We construct this axially symmetric one?monopole solution by generalizing the large distance asymptotic solutions of the ’t Hooft?Polyakov one?monopole to the Jacobi elliptic functions and solving the second order equations of motion numerically when the Higgs potential is vanishing. This solution is a non?BPS solution.

Khai?Ming Wong; Rosy Teh

2009-01-01T23:59:59.000Z

289

Sensitivity Reach of the Neutron EDM Experiment: The Electric Field Strength  

SciTech Connect (OSTI)

The search for an electric dipole moment of the neutron tests physics beyond the Standard Model such as new sources of CP-violation and Supersymmetry. The nEDM experiment aims to improve the sensitivity on the current limit of the electric dipole moment of the neutron to <10{sup -27} e{center_dot}cm. The experiment will use a flux of Ultra Cold Neutrons (UCNs) produced and stored in a bath of superfluid He-II. A change in precession frequency is expected for a non-zero EDM when an electric field is applied parallel and antiparallel to a magnetic field across the neutron storage cell. A dominant parameter in terms of reducing the statistical uncertainty of this measurement is the strength of the applied electric field. An experiment to measure if superfluid He-II can sustain up to 50 kV/cm for a volume and electrode spacings comparable to the nEDM experiment has been constructed at Los Alamos National Laboratory. It consists in a large-area parallel plate capacitor immersed in a 200 liter central volume inside a suitable cryostat that in turn is connected to a dilution refrigerator unit. A description of test runs and the status of the experiment is presented.

Hennings-Yeomans, R.; Cooper, M.; Currie, S. A.; Makela, M. F.; Ramsey, J. C.; Tajima, S.; Womack, T. L. [Physics Division, Los Alamos National Laboratory, Los Alamos NM 87545 (United States); Long, J. C. [Department of Physics, Indiana University, 727 E. Third St. Bloomington, IN 47405-7105 (United States); Stanislaus, S. [Department of Physics and Astronomy, Valparaiso University, Valparaiso, IN 46383 (United States)

2010-08-04T23:59:59.000Z

290

Electric field noise above surfaces: a model for heating rate scaling law in ion traps  

E-Print Network [OSTI]

We present a model for the scaling laws of the electric field noise spectral density as a function of the distance, $d$, above a conducting surface. Our analytical approach models the patch potentials by introducing a correlation length, $\\zeta$, of the electric potential on the surface. The predicted scaling laws are in excellent agreement with two different classes of experiments (cold trapped ions and cantilevers), that span at least four orders of magnitude of $d$. According to this model, heating rate in miniature ion traps could be greatly reduced by proper material engineering.

Romain Dubessy; Thomas Coudreau; Luca Guidoni

2008-12-17T23:59:59.000Z

291

The sediment of mixtures of charged colloids: segregation and inhomogeneous electric fields  

E-Print Network [OSTI]

We theoretically study sedimentation-diffusion equilibrium of dilute binary, ternary, and polydisperse mixtures of colloidal particles with different buoyant masses and/or charges. We focus on the low-salt regime, where the entropy of the screening ions drives spontaneous charge separation and the formation of an inhomogeneous macroscopic electric field. The resulting electric force lifts the colloids against gravity, yielding highly nonbarometric and even nonmonotonic colloidal density profiles. The most profound effect is the phenomenon of segregation into layers of colloids with equal mass-per-charge, including the possibility that heavy colloidal species float onto lighter ones.

Jos Zwanikken; rene van Roij

2005-04-18T23:59:59.000Z

292

Capillary origami controlled by an electric field Miguel Pi~neirua,* Jose Bico and Benoi^t Roman  

E-Print Network [OSTI]

Capillary origami controlled by an electric field Miguel Pi~neirua,* Jose Bico and Benoi^t Roman an electric field can control the folding and unfolding of a thin elastic membrane around a liquid droplet, although the structure closes back for a lower critical tension. We propose scaling laws for these critical

Bico,José

293

General Physics II Exam 1 -Chs. 1619 -Electric Fields, Potential, Current Feb. 14, 2011 Name Rec. Instr. Rec. Time  

E-Print Network [OSTI]

styrofoam ball? a. It has a negative net charge b. It has zero net charge. c. It has positive net charge. d at finite x where the electric field is zero. c) (8) Determine the magnitude of the net electric field. Its net charge changes when then rods are placed near it. 2. (6) An excess charge of -88 pC is placed

Wysin, Gary

294

Hydrogen atom in crossed electric and magnetic fields: Phase space topology and torus quantization via periodic orbits  

E-Print Network [OSTI]

Hydrogen atom in crossed electric and magnetic fields: Phase space topology and torus quantization for the periodic orbits in a strongly coupled multidimen- sional Hamiltonian system, namely the hydrogen atom.15.Gy, 05.45.-a, 45.20.Jj I. INTRODUCTION The hydrogen atom in crossed electric and magnetic fields

295

Electric field control of the LaAlO3/SrTiO3 interface ground state  

Science Journals Connector (OSTI)

... identified: a magnetic state and a two-dimensional superconducting condensate. Here we use the electric field effect to explore the phase diagram of the system. The electrostatic tuning of ... insulating state are consistent with weak localization and do not provide evidence for magnetism. The electric field control of superconductivity demonstrated here opens the way to the development of new mesoscopic ...

A. D. Caviglia; S. Gariglio; N. Reyren; D. Jaccard; T. Schneider; M. Gabay; S. Thiel; G. Hammerl; J. Mannhart; J.-M. Triscone

2008-12-04T23:59:59.000Z

296

Meson cloud contributions to baryon axial form factors  

E-Print Network [OSTI]

The axial form factor as well as the axial charge of octet baryons are studied in the perturbative chiral quark model (PCQM) with the quark wave functions predetermined by fitting the theoretical results of the proton charge form factor to experimental data. The theoretical results are found, based on the predetermined quark wave functions, in good agreement with experimental data and lattice values. This may indicate that the electric charge and axial charge distributions of the constituent quarks are the same. The study reveals that the meson cloud plays an important role in the axial charge of octet baryons, contributing 30%-40% to the total values, and strange sea quarks have a considerable contribution to the axial charge of the $\\Sigma$ and $\\Xi$.

X. Y. Liu; K. Khosonthongkee; A. Limphirat; P. Suebka; Y. Yan

2014-08-01T23:59:59.000Z

297

Balloon observations of ultra-low-frequency waves in the electric field above the South Pole  

SciTech Connect (OSTI)

The physics of ultra-low-frequency waves in the magnetosphere, near the cusp and in the polar cap, is important because this region is one where ultra-low-frequency wave energy from the magnetopause can most easily enter the magnetosphere. During the 1985-1986 South Pole balloon campaign, eight stratospheric balloon payloads were launched from Amundsen-Scott Station, South Geographic Pole, Antarctica, to record data on ultra-low-frequency waves. The payloads were instrumented with three-axis double-probe electric field detectors and X-ray scintillation counters. This paper concentrates on the third flight of this series, which was launched at 2205 universal time on 21 December 1985. Good data were received from the payload until the transmitter failed at 0342 universal time on 22 December. During most of the four hours that the balloon was afloat, an intense ultra-low-frequency wave event was in progress. The electric-field data from this period have been examined in detail and compared with magnetic field data, obtained with ground-based fluxgate and induction magnetometers to determine the characteristics of the waves. After float was reached, the electric-field data in figure 1 show large-amplitude, quasi-periodic fluctuations suggesting the presence of intense ultra-low-frequency wave activity. In conclusion, the electric-field signature observed from flight 3 appears to have been essentially an electrostatic event or possibly a short-wavelength hydromagnetic wave with a varying and interesting polarization character. The authors are continuing the analysis of the data to determine the source of the observed ultra-low-frequency waves.

Liao, B.; Benbrrook, J.R.; Bering E.A. III; Byrne, G.J.; Theall, J.R. (Univ. of Houston, TX (USA))

1988-01-01T23:59:59.000Z

298

A cryogenic axial-centrifugal compressor for superfluid helium refrigeration  

E-Print Network [OSTI]

CERN's new project, the Large Hadron Collider (LHC), will use superfluid helium as coolant for its high-field superconducting magnets and therefore require large capacity refrigeration at 1.8 K. This may only be achieved by subatmospheric compression of gaseous helium at cryogenic temperature. To stimulate development of this technology, CERN has procured from industry prototype Cold Compressor Units (CCU). This unit is based on a cryogenic axial-centrifugal compressor, running on ceramic ball bearings and driven by a variable-frequency electrical motor operating under low-pressure helium at ambient temperature. The machine has been commissioned and is now in operation. After describing basic constructional features of the compressor, we report on measured performance.

Decker, L; Schustr, P; Vins, M; Brunovsky, I; Lebrun, P; Tavian, L

1997-01-01T23:59:59.000Z

299

Semi-flexible gas-insulated transmission line using electric field stress shields  

DOE Patents [OSTI]

A gas-insulated transmission line includes an outer sheath, an inner conductor, an insulating gas electrically insulating the inner conductor from the outer sheath, and insulating supports insulatably supporting the inner conductor within the outer sheath. The inner conductor is provided with flexibility by use of main conductor sections which are joined together through a conductor hub section and flexible flexing elements. Stress shields are provided to control the electric field at the locations of the conductor hub sections where the insulating supports are contacting the inner conductor. The flexing elements and the stress shields may also be utilized in connection with a plug and socket arrangement for providing electrical connection between main conductor sections.

Cookson, Alan H. (Churchill Borough, PA); Dale, Steinar J. (Monroeville, PA); Bolin, Philip C. (Wilkins Township, Allegheny County, PA)

1982-12-28T23:59:59.000Z

300

Charge and Electric Field Fluctuations in Aqueous NaCl Electrolytes  

SciTech Connect (OSTI)

Conventional wisdom concerning crystallization assumes that when NaCl crystallizes from a supersaturated solution, the solvated ions retain their ionic character and simply relocate from their hydration spheres to their most stable positions in the crystal lattice. However, this conventional picture is at odds with observations over 200 years ago reporting the emission of long-lived light resulting from the crystallization of certain salts – appropriately referred to as crystalloluminescence. This suggests that electronic structure plays an essential role in crystallization. Strong electric field fluctuations in the gas or condensed phases can drive changes in electronic structure. We have calculated the fluctuation of charge, scalar electric potentials, and vector electric fields for concentrated aqueous NaCl electrolytes. The H2O molecules in the 1st solvation shell of the ions serve as a sink for electron density originating on Cl-. Our analysis reveals that the electric fields inside aqueous electrolytes are extremely large (up to several V/Å) and thus may alter the ground and excited electronic states in the condensed phase. Furthermore, our analysis shows that the potential and field distributions are largely independent of concentration. We find that the field component distributions to be Gaussian for the ions and non-Gaussian for the O and H sites (computed in the lab frame of reference), however, these non-Gaussian distributions are readily modeled via an orientationally averaged non-zero mean Gaussian plus a zero mean Gaussian. These calculations and analyses provide the first steps toward understanding the magnitude and fluctuations of charge, electric potentials and fields in aqueous electrolytes and what role these fields may play in driving charge redistribution/transfer during crystalloluminescence. We would like to gratefully acknowledge helpful discussions with Gregory K. Schenter. This work was supported by the U.S. Department of Energy’s (DOE) Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences program and used resources of the National Energy Research Scientific Computing Center (NERSC), which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Pacific Northwest National Laboratory (PNNL) is operated by Battelle for the US Department of Energy.

Sellner, Bernhard; Valiev, Marat; Kathmann, Shawn M.

2013-09-19T23:59:59.000Z

Note: This page contains sample records for the topic "axial electric field" from the National Library of EnergyBeta (NLEBeta).
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301

Effect of an AC electric field on the conductance of single-wall semiconductor-type carbon nanotubes  

SciTech Connect (OSTI)

The effect of an ac electric field on the conductance of a system of single-wall semiconductor-type carbon nanotubes placed in a dc electric field is considered. The strength vectors of dc and ac electric fields are directed along the nanotube axis. The electronic system of carbon nanotubes is considered in the context of the Boltzmann kinetic equation in the relaxation-time approximation. The dependence of the current density in the system on the characteristics of applied fields is studied. The effect of absolute negative conductance is detected.

Belonenko, M. B.; Glazov, S. Yu., E-mail: ser-glazov@yandex.ru [Volgograd State Pedagogical University (Russian Federation); Mescheryakova, N. E., E-mail: Dandelion1@yandex.ru [Volgograd Business Institute (Russian Federation)

2010-09-15T23:59:59.000Z

302

Observation, modeling, and temperature dependence of doubly peaked electric fields in irradiated silicon pixel sensors  

E-Print Network [OSTI]

We show that doubly peaked electric fields are necessary to describe grazing-angle charge collection measurements of irradiated silicon pixel sensors. A model of irradiated silicon based upon two defect levels with opposite charge states and the trapping of charge carriers can be tuned to produce a good description of the measured charge collection profiles in the fluence range from 0.5x10^{14} Neq/cm^2 to 5.9x10^{14} Neq/cm^2. The model correctly predicts the variation in the profiles as the temperature is changed from -10C to -25C. The measured charge collection profiles are inconsistent with the linearly-varying electric fields predicted by the usual description based upon a uniform effective doping density. This observation calls into question the practice of using effective doping densities to characterize irradiated silicon.

M. Swartz; V. Chiochia; Y. Allkofer; D. Bortoletto; L. Cremaldi; S. Cucciarelli; A. Dorokhov; C. Hoermann; D. Kim; M. Konecki; D. Kotlinski; K. Prokofiev; C. Regenfus; T. Rohe; D. A. Sanders; S. Son; T. Speer

2006-01-05T23:59:59.000Z

303

Dynamic transport simulation code including plasma rotation and radial electric field  

Science Journals Connector (OSTI)

A new one-dimensional transport code named TASK/TX, which is able to describe dynamic behavior of tokamak plasmas, has been developed. It solves simultaneously a set of flux-surface averaged equations composed of Maxwell's equations, continuity equations, ... Keywords: 52.25.Fi, 52.30.-q, 52.55.Fa, 52.65.-y, Finite element method, Plasma rotation, Radial electric field, SUPG, Transport simulation

M. Honda; A. Fukuyama

2008-02-01T23:59:59.000Z

304

High electric field effects on the thermal generation in hydrogenated amorphous silicon  

SciTech Connect (OSTI)

The authors have studied the electric field dependence of the electron-hole thermal generation process in hydrogenated amorphous silicon. A model was developed which takes into account the Poole-Frenkel effect and the thermally assisted tunneling. In order to explain the experimental results it was necessary to consider a strong electron-lattice interaction describing the carrier tunneling mechanism. Deep defects relaxation is also discussed.

Ilie, A.; Equer, B.

1997-07-01T23:59:59.000Z

305

Transition of the radial electric field by electron cyclotron heating in the CHS heliotron/torsatron  

Science Journals Connector (OSTI)

The transition of a radial electric field from a negative to a positive value is observed in the compact helical system when the electron loss is sufficiently enhanced by the superposition of the off-axis second harmonic electron cyclotron heating on the neutral beam heated plasmas. Existence of the threshold for the enhanced particle flux required to cause the transition is experimentally certified. The observed threshold is compared with a theoretical prediction.

H. Idei; K. Ida; H. Sanuki; H. Yamada; H. Iguchi; S. Kubo; R. Akiyama; H. Arimoto; M. Fujiwara; M. Hosokawa; K. Matsuoka; S. Morita; K. Nishimura; K. Ohkubo; S. Okamura; S. Sakakibara; C. Takahashi; Y. Takita; K. Tsumori; I. Yamada

1993-10-04T23:59:59.000Z

306

Unusually Small Electrical Resistance of Three-Dimensional Nanoporous Gold in External Magnetic Fields  

Science Journals Connector (OSTI)

We report the electric conductivity of three-dimensional (3D) nanoporous gold at low temperatures and in strong magnetic fields. It was found that topologically disordered 3D nanoporosity leads to extremely low magnetoresistance and anomalous temperature dependence as the characteristic length of nanoporous gold is tuned to be ?14??nm. This study underscores the importance of 3D topology of a nanostructure on electronic transport properties and has implications in manipulating electron transport by tailoring 3D nanostructures.

T. Fujita; H. Okada; K. Koyama; K. Watanabe; S. Maekawa; M. W. Chen

2008-10-16T23:59:59.000Z

307

Scaling of the Longitudinal Electric Field and Transformer Ratio in a Nonlinear Plasma Wakefield Accelerator  

SciTech Connect (OSTI)

The scaling of the two important figures of merit, the transformer ratio T and the longitudinal electric field E{sub z}, with the peak drive-bunch current I{sub p}, in a nonlinear plasma wakefield accelerator is presented for the first time. The longitudinal field scales as I{sub P}{sup 0.623{+-}0.007}, in good agreement with nonlinear wakefield theory ({approx}I{sub P}{sup 0.5}), while the unloaded transformer ratio is shown to be greater than unity and scales weakly with the bunch current. The effect of bunch head erosion on both parameters is also discussed.

Blumenfeld, I.; /SLAC; Clayton, C.E.; /UCLA; Decker, F.J.; Hogan, M.J.; /SLAC; Huang, C.; /UCLA; Ischebeck, R.; Iverson, R.H.; /SLAC; Joshi, C.; /UCLA; Katsouleas, T.; /Southern California U.; Kirby, N.; /SLAC; Lu, W.; Marsh, K.A.; Mori, W.B.; /UCLA; Muggli, P.; Oz, E.; /Southern California U.; Siemann, R.H.; Walz, D.R.; /SLAC; Zhou, M.; /UCLA

2012-06-12T23:59:59.000Z

308

Modeling electron transport in the presence of electric and magnetic fields.  

SciTech Connect (OSTI)

This report describes the theoretical background on modeling electron transport in the presence of electric and magnetic fields by incorporating the effects of the Lorentz force on electron motion into the Boltzmann transport equation. Electromagnetic fields alter the electron energy and trajectory continuously, and these effects can be characterized mathematically by differential operators in terms of electron energy and direction. Numerical solution techniques, based on the discrete-ordinates and finite-element methods, are developed and implemented in an existing radiation transport code, SCEPTRE.

Fan, Wesley C.; Drumm, Clifton Russell; Pautz, Shawn D.; Turner, C. David

2013-09-01T23:59:59.000Z

309

Note: Versatile sample stick for neutron scattering experiments in high electric fields  

SciTech Connect (OSTI)

We present a versatile high voltage sample stick that fits into all cryomagnets and standard cryostats at the Swiss Spallation Neutron Source, Paul Scherrer Institut, and which provides a low effort route to neutron scattering experiments that combine electric field with low temperature and magnetic field. The stick allows for voltages up to 5 kV and can be easily adapted for different scattering geometries. We discuss the design consideration and thermal behavior of the stick, and give one example to showcase the abilities of the device.

Bartkowiak, M., E-mail: marek.bartkowiak@psi.ch [Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen (Switzerland); White, J. S. [Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen (Switzerland) [Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen (Switzerland); Laboratory for Quantum Magnetism, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland); Rønnow, H. M.; Prša, K. [Laboratory for Quantum Magnetism, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland)] [Laboratory for Quantum Magnetism, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland)

2014-02-15T23:59:59.000Z

310

Measurements of static electrical conductivity of a dense plasma in a magnetic field  

Science Journals Connector (OSTI)

New experimental setup for generation of a non-ideal plasma, placed in a magnetic field of up to 25 T, is presented. The plasma generation technique is based on gas compression and heating behind the front of a shock wave with the use of an explosively driven linear generator. The magnetic field is produced by a discharge of a capacitor through a solenoid reeled on the generator channel. DC electrical conductivity of the plasma is determined by two and four contact techniques. Possibilities of magnetized dense plasma generation are discussed.

N S Shilkin; D S Yuriev; S V Dudin; V B Mintsev; V E Fortov

2006-01-01T23:59:59.000Z

311

The EMDEX (Electric and Magnetic Field Digital Exposure) Project: Technology transfer and occupational measurements  

SciTech Connect (OSTI)

The Electric and Magnetic Field Measurement Project for Utilities -- the EPRI EMDEX Project -- is a multifaceted project entailing technology transfer, measurement protocol design, data management, and exposure assessment analyses. The specific objectives of the project in order to priority were: (1) to transfer the EMDEX technology to utilities; (2) to develop measurement protocols and data management capabilities for large exposure data sets; and (3) to collect, analyze, and document 60-Hz electric and magnetic field exposures for a diverse population. Transfer of the EPRI Electric and Magnetic Field Digital Exposure system (EMDEX) technology to the participating utilities was accomplished through training and through extensive involvement in the exposure data collection effort. Documentation of the EMDEX Project is contained in three volumes: Volume 1 summarizes the methods and results, and provides an assessment of project objectives; Volume 2 provides detailed descriptions of methods, procedures, protocols, materials and analyses, and Volume 3 contains appendices with a complete set of project protocols, project materials, and extensive data tables. 12 refs., 27 figs., 23 tabs.

Not Available

1990-11-01T23:59:59.000Z

312

Electric field induced needle-pulsed arc discharge carbon nanotube production apparatus: Circuitry and mechanical design  

SciTech Connect (OSTI)

A simple and low cost apparatus is reported to produce multiwall carbon nanotubes and carbon nano-onions by a low power short pulsed arc discharge reactor. The electric circuitry and the mechanical design details and a micro-filtering assembly are described. The pulsed-plasma is generated and applied between two graphite electrodes. The pulse width is 0.3 {mu}s. A strong dc electric field is established along side the electrodes. The repetitive discharges occur in less than 1 mm distance between a sharp tip graphite rod as anode, and a tubular graphite as cathode. A hydrocarbon vapor, as carbon source, is introduced through the graphite nozzle in the cathode assembly. The pressure of the chamber is controlled by a vacuum pump. A magnetic field, perpendicular to the plasma path, is provided. The results show that the synergetic use of a pulsed-current and a dc power supply enables us to synthesize carbon nanoparticles with short pulsed plasma. The simplicity and inexpensiveness of this plan is noticeable. Pulsed nature of plasma provides some extra degrees of freedom that make the production more controllable. Effects of some design parameters such as electric field, pulse frequency, and cathode shape are discussed. The products are examined using scanning probe microscopy techniques.

Kia, Kaveh Kazemi [Department of Electrical and Computer Engineering, Islamic Azad University of Bonab, Bonab (Iran, Islamic Republic of); Bonabi, Fahimeh [Department of Engineering, Islamic Azad University of Bonab, Bonab (Iran, Islamic Republic of)

2012-12-15T23:59:59.000Z

313

Electric fields effect on liftoff and blowoff of nonpremixed laminar jet flames in a coflow  

SciTech Connect (OSTI)

The stabilization characteristics of liftoff and blowoff in nonpremixed laminar jet flames in a coflow have been investigated experimentally for propane fuel by applying AC and DC electric fields to the fuel nozzle with a single-electrode configuration. The liftoff and blowoff velocities have been measured by varying the applied voltage and frequency of AC and the voltage and the polarity of DC. The result showed that the AC electric fields extended the stabilization regime of nozzle-attached flame in terms of jet velocity. As the applied AC voltage increased, the nozzle-attached flame was maintained even over the blowout velocity without having electric fields. In such a case, a blowoff occurred directly without experiencing a lifted flame. While for the DC cases, the influence on liftoff was minimal. There existed three different regimes depending on the applied AC voltage. In the low voltage regime, the nozzle-detachment velocity of either liftoff or blowoff increased linearly with the applied voltage, while nonlinearly with the AC frequency. In the intermediate voltage regime, the detachment velocity decreased with the applied voltage and reasonably independent of the AC frequency. At the high voltage regime, the detachment was significantly influenced by the generation of discharges. (author)

Kim, M.K.; Ryu, S.K.; Won, S.H. [School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742 (Korea); Chung, S.H. [Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal (Saudi Arabia)

2010-01-15T23:59:59.000Z

314

Method of sustaining a radial electric field and poloidal plasma rotation over most of the cross-section of a tokamak  

DOE Patents [OSTI]

A radial electric field of a desired magnitude and configuration is created hroughout a substantial portion of the cross-section of the plasma of a tokamak. The radial electric field is created by injection of a unidirectional electron beam. The magnitude and configuration of the radial electric field may be controlled by the strength of the toroidal magnetic field of the tokamak.

Darrow, Douglass S. (Plainsboro, NJ); Ono, Masayuki (Princeton Jct., NJ)

1990-01-01T23:59:59.000Z

315

ELECTRIC  

Office of Legacy Management (LM)

you nay give us will be greatly uppreckted. VPry truly your23, 9. IX. Sin0j3, Mtinager lclectronics and Nuclear Physics Dept. omh , WESTINGHOUSE-THE NAT KING IN ELECTRICITY...

316

CO2 Capture Using Electric Fields: Low-Cost Electrochromic Film on Plastic for Net-Zero Energy Building  

SciTech Connect (OSTI)

Broad Funding Opportunity Announcement Project: Two faculty members at Lehigh University created a new technique called supercapacitive swing adsorption (SSA) that uses electrical charges to encourage materials to capture and release CO2. Current CO2 capture methods include expensive processes that involve changes in temperature or pressure. Lehigh University’s approach uses electric fields to improve the ability of inexpensive carbon sorbents to trap CO2. Because this process uses electric fields and not electric current, the overall energy consumption is projected to be much lower than conventional methods. Lehigh University is now optimizing the materials to maximize CO2 capture and minimize the energy needed for the process.

None

2010-01-01T23:59:59.000Z

317

Formation of ordered films of axially bridged aluminum phthalocyanine [(tBu){sub 4}PcAl]{sub 2}O via magnetic field-induced reaction  

SciTech Connect (OSTI)

The ?-(oxo)bis[tetra-tert-butylphthalocyaninato] aluminum(III) [(tBu){sub 4}PcAl]{sub 2}O films with the crystallites oriented preferably in one direction were obtained via chemical transformation of tetra-tert-butylsubstituted chloroaluminum(III) phthalocyanine (tBu){sub 4}PcAlCl film upon its annealing in magnetic field. A comparative analysis of the influence of post-deposition annealing process without and under applied magnetic field of 1 T, on the orientation and morphology of (tBu){sub 4}PcAlCl and [(tBu){sub 4}PcAl]{sub 2}O films, has been carried out by the methods of UV-vis, Infrared and Raman spectroscopies, XRD as well as atomic force microscopy. The formation of [(tBu){sub 4}PcAl]{sub 2}O films with elongated crystallites having preferential orientation was observed upon heating of the films in magnetic field while annealing without magnetic field under the same conditions does not demonstrate any effect on the structure and morphology of these films. The reasons of the sensitivity of this reaction to the presence of such magnetic field is discussed and studied by electronic paramagnetic resonance spectroscopy.

Basova, Tamara, E-mail: basova@niic.nsc.ru; Berezin, Aleksei; Nadolinny, Vladimir [Nikolaev Institute of Inorganic Chemistry, Russian Academy of Sciences, Lavrentiev Pr., 3, 630090 Novosibirsk (Russian Federation)] [Nikolaev Institute of Inorganic Chemistry, Russian Academy of Sciences, Lavrentiev Pr., 3, 630090 Novosibirsk (Russian Federation); Peisert, Heiko; Chassé, Thomas [Institute for Physical and Theoretical Chemistry, Auf der Morgenstelle 18, 72076 Tübingen (Germany)] [Institute for Physical and Theoretical Chemistry, Auf der Morgenstelle 18, 72076 Tübingen (Germany); Banimuslem, Hikmat; Hassan, Aseel [Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB (United Kingdom)] [Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield S1 1WB (United Kingdom)

2013-11-28T23:59:59.000Z

318

Neutron electric polarizability from unquenched lattice QCD using the background field approach  

E-Print Network [OSTI]

A calculational scheme for obtaining the electric polarizability of the neutron in lattice QCD with dynamical quarks is developed, using the background field approach. The scheme differs substantially from methods previously used in the quenched approximation, the physical reason being that the QCD ensemble is no longer independent of the external electromagnetic field in the dynamical quark case. One is led to compute (certain integrals over) four-point functions. Particular emphasis is also placed on the physical role of constant external gauge fields on a finite lattice; the presence of these fields complicates the extraction of polarizabilities, since it gives rise to an additional shift of the neutron mass unrelated to polarizability effects. The method is tested on a SU(3) flavor-symmetric ensemble furnished by the MILC Collaboration, corresponding to a pion mass of m_pi = 759 MeV. Disconnected diagrams are evaluated using stochastic estimation. A small negative electric polarizability of alpha =(-2.0 +/- 0.9) 10^(-4) fm^3 is found for the neutron at this rather large pion mass; this result does not seem implausible in view of the qualitative behavior of alpha as a function of m_pi suggested by Chiral Effective Theory.

Michael Engelhardt

2007-12-01T23:59:59.000Z

319

Electric charge in the field of a magnetic event in three-dimensional spacetime  

E-Print Network [OSTI]

We analyze the motion of an electric charge in the field of a magnetically charged event in three-dimensional spacetime. We start by exhibiting a first integral of the equations of motion in terms of the three conserved components of the spacetime angular momentum, and then proceed numerically. After crossing the light cone of the event, an electric charge initially at rest starts rotating and slowing down. There are two lengths appearing in the problem: (i) the characteristic length $\\frac{q g}{2 \\pi m}$, where $q$ and $m$ are the electric charge and mass of the particle, and $g$ is the magnetic charge of the event; and (ii) the spacetime impact parameter $r_0$. For $r_0 \\gg \\frac{q g}{2 \\pi m}$, after a time of order $r_0$, the particle makes sharply a quarter of a turn and comes to rest at the same spatial position at which the event happened in the past. This jump is the main signature of the presence of the magnetic event as felt by an electric charge. A derivation of the expression for the angular momentum that uses Noether's theorem in the magnetic representation is given in the Appendix.

Claudio Bunster; Cristian Martinez

2012-02-09T23:59:59.000Z

320

Wave function for harmonically confined electrons in time-dependent electric and magnetostatic fields  

SciTech Connect (OSTI)

We derive via the interaction “representation” the many-body wave function for harmonically confined electrons in the presence of a magnetostatic field and perturbed by a spatially homogeneous time-dependent electric field—the Generalized Kohn Theorem (GKT) wave function. In the absence of the harmonic confinement – the uniform electron gas – the GKT wave function reduces to the Kohn Theorem wave function. Without the magnetostatic field, the GKT wave function is the Harmonic Potential Theorem wave function. We further prove the validity of the connection between the GKT wave function derived and the system in an accelerated frame of reference. Finally, we provide examples of the application of the GKT wave function.

Zhu, Hong-Ming; Chen, Jin-Wang; Pan, Xiao-Yin, E-mail: panxiaoyin@nbu.edu.cn [Department of Physics, Ningbo University, Ningbo 315211 (China)] [Department of Physics, Ningbo University, Ningbo 315211 (China); Sahni, Viraht [Department of Physics, Brooklyn College and The Graduate School of the City University of New York, New York, New York 10016 (United States)] [Department of Physics, Brooklyn College and The Graduate School of the City University of New York, New York, New York 10016 (United States)

2014-01-14T23:59:59.000Z

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


321

Electromagnetic waves destabilized by runaway electrons in near-critical electric fields  

SciTech Connect (OSTI)

Runaway electron distributions are strongly anisotropic in velocity space. This anisotropy is a source of free energy that may destabilize electromagnetic waves through a resonant interaction between the waves and the energetic electrons. In this work, we investigate the high-frequency electromagnetic waves that are destabilized by runaway electron beams when the electric field is close to the critical field for runaway acceleration. Using a runaway electron distribution appropriate for the near-critical case, we calculate the linear instability growth rate of these waves and conclude that the obliquely propagating whistler waves are most unstable. We show that the frequencies, wave numbers, and propagation angles of the most unstable waves depend strongly on the magnetic field. Taking into account collisional and convective damping of the waves, we determine the number density of runaways that is required to destabilize the waves and show its parametric dependences.

Komar, A.; Pokol, G. I. [Department of Nuclear Techniques, Budapest University of Technology and Economics, Association EURATOM, H-1111 Budapest (Hungary); Fueloep, T. [Department of Applied Physics, Nuclear Engineering, Chalmers University of Technology and Euratom-VR Association, Goeteborg (Sweden)

2013-01-15T23:59:59.000Z

322

Electric and magnetic fields research and public information dissemination program. Progress report  

SciTech Connect (OSTI)

The Electric and Magnetic Fields (EMF) Research and Public Information Dissemination (RAPID) Program was authorized by the Energy Policy Act of 1992 (enacted October 24, 1992) to determine whether or not exposure to EMF produced by the generation, transmission, and use of electric energy affects human health. Two Federal agencies, the Department of Energy (DOE) and the National Institute of Environmental Health Sciences (NIEHS), have primary responsibility for the program, but other Federal agencies are key participants as well. This program requires that Federal appropriations be matched by contributions from non-Federal sources. The authorized level of funding for the program was $65 million over a 5-year period (fiscal years 1993-1997 inclusive). For EMF RAPID to be a fully funded program, $32.5 million over 5 years will have to be appropriated by Congress and matched by non-Federal contributions.

NONE

1995-12-01T23:59:59.000Z

323

Parallel electric fields in a simulation of magnetotail reconnection and plasmoid evolution  

SciTech Connect (OSTI)

We investigate properties of the electric field component parallel to the magnetic field (E/sub /parallel//) in a three-dimensional MHD simulation of plasmoid formation and evolution in the magnetotail in the presence of a net dawn-dusk magnetic field component. We emphasize particularly the spatial location of E/sub /parallel//, the concept of a diffusion zone and the role of E/sub /parallel// in accelerating electrons. We find a localization of the region of enhanced E/sub /parallel// in all space directions with a strong concentration in the z direction. We identify this region as the diffusion zone, which plays a crucial role in reconnection theory through the local break-down of magnetic flux conservation. The presence of B/sub y/ implies a north-south asymmetry of the injection of accelerated particles into the near-earth region, if the net B/sub y/ field is strong enough to force particles to follow field lines through the diffusion region. We estimate that for a typical net B/sub y/ field this should affect the injection of electrons into the near-earth dawn region, so that precipitation into the northern (southern) hemisphere should dominate for duskward (dawnward) net B/sub y/. In addition, we observe a spatial clottiness of the expected injection of adiabatic particles which could be related to the appearance bright spots in auroras. 12 refs., 9 figs.

Hesse, M.; Birn, J.

1989-01-01T23:59:59.000Z

324

Probing the plasma near high power wave launchers in fusion devices for static and dynamic electric fields  

SciTech Connect (OSTI)

An exploratory study was carried out in the long-pulse tokamak Tore Supra, to determine if electric fields in the plasma around high-power, RF wave launchers could be measured with non-intrusive, passive, optical emission spectroscopy. The focus was in particular on the use of the external electric field Stark effect. The feasibility was found to be strongly dependent on the spatial extent of the electric fields and overlap between regions of strong (> 1 kV/cm) electric fields and regions of plasma particle recycling and plasma-induced, spectral line emission. Most amenable to the measurement was the RF electric field in edge plasma, in front of a lower hybrid heating and current drive launcher. Electric field strengths and direction, derived from fitting the acquired spectra to a model including time-dependent Stark effect and the tokamak-range magnetic field Zeeman-effect, were found to be in good agreement with full-wave modeling of the observed launcher.

Klepper, C Christopher [ORNL; Martin, Elijah H [ORNL; Isler, Ralph C [ORNL; Colas, L. [French Atomic Energy Commission (CEA), Cadarache, St. Paul lez Durance; Goniche, M. [French Atomic Energy Commission (CEA), Cadarache, St. Paul lez Durance; Hillairet, J. [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM); Panayotis, Stephanie [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM); Jacquot, Jonathan [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM); Lotte, Ph. [French Atomic Energy Commission (CEA), Cadarache, St. Paul lez Durance; Colledani, G. [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM); Biewer, Theodore M [ORNL; Caughman, J. B. O. [Oak Ridge National Laboratory (ORNL); Ekedahl, A. [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM); Green, David L [ORNL; Harris, Jeffrey H [ORNL; Hillis, Donald Lee [ORNL; Shannon, Prof. Steven [North Carolina State University; Litaudon, X [French Atomic Energy Commission (CEA)

2014-01-01T23:59:59.000Z

325

Reply to comment on "Electrical Tomography of La Soufrire of Guadeloupe Volcano: Field experiments, 1D inversion and  

E-Print Network [OSTI]

Discussion Reply to comment on "Electrical Tomography of La Soufrière of Guadeloupe Volcano: Field.25.Qi; 91.35.Pn; 91.40.-k; 93.30.Vs 1. Introduction We thank Linde and Revil for their comment [1 and discuss our approach for interpreting electrical resistivity data acquired over complex geological

Beauducel, François

326

Edge radial electric field structure and its connections to H-mode confinement in Alcator C-Mod Plasmas  

E-Print Network [OSTI]

High-resolution charge-exchange recombination spectroscopic measurements of B[superscript 5+] ions have enabled the first spatially resolved calculations of the radial electric field (E[subscript r]) in the Alcator C-Mod ...

Hutchinson, Ian H.

327

Oxidation Behavior of CO Catalyzed by Several Decahedral Au Clusters: Role of Cluster Stability and Electric Field  

Science Journals Connector (OSTI)

Oxidation Behavior of CO Catalyzed by Several Decahedral Au Clusters: Role of Cluster Stability and Electric Field ... Key Laboratory of Automobile Materials, Ministry of Education, and School of Materials Science and Engineering, Jilin University, Changchun 130022, China ...

W. Liu; Y. F. Zhu; Q. Jiang

2010-11-15T23:59:59.000Z

328

Thin film deposition by electric and magnetic crossed-field diode sputtering  

DOE Patents [OSTI]

Applying a thin film coating to the surface of a workpiece, in particular, applying a coating of titanium nitride to a klystron window by means of a crossed-field diode sputtering array. The array is comprised of a cohesive group of numerous small hollow electrically conducting cylinders and is mounted so that the open ends of the cylinders on one side of the group are adjacent a titanium cathode plate. The workpiece is mounted so as to face the open ends of the other side of the group. A magnetic field is applied to the array so as to be coaxial with the cylinders and a potential is applied across the cylinders and the cathode plate, the cylinders as an anode being positive with respect to the cathode plate. The cylinders, the cathode plate and the workpiece are situated in an atmosphere of nitrogen which becomes ionized such as by field emission because of the electric field between the cylinders and cathode plate, thereby establishing an anode-cathode discharge that results in sputtering of the titanium plate. The sputtered titanium coats the workpiece and chemically combines with the nitrogen to form a titanium nitride coating on the workpiece. Gas pressure, gas mixtures, cathode material composition, voltages applied to the cathode and anode, the magnetic field, cathode, anode and workpiece spacing, and the aspect ratio (ratio of length to inner diameter) of the anode cylinders, all may be controlled to provide consistent optimum thin film coatings of various compositions and thicknesses. Another facet of the disclosure is the coating of microwave components per se with titanium nitride to reduce multipactoring under operating conditions of the components.

Welch, Kimo M. (Mountain View, CA)

1980-01-01T23:59:59.000Z

329

Electric-field-induced turbulent energy cascade in an oil-in-oil emulsion  

E-Print Network [OSTI]

We observe electro-hydrodynamically driven turbulent flows at low Reynolds numbers in a two-fluid emulsion consisting of micron-scale droplets. In the presence of electric fields, the droplets produce interacting hydrodynamic flows which result in a dynamical organization at a spatial scale much larger than the size of the individual droplets. We characterize the dynamics associated with these structures by both video imaging and a simultaneous, in situ, measurement of the time variation of the bulk Reynolds stress with a rheometer. The results display scale invariance in the energy spectra in both space and time.

Atul Varshney; Mayur Sathe; Shankar Ghosh; Anand Yethiraj; S. Bhattacharya; J. B. Joshi

2014-12-11T23:59:59.000Z

330

Geometric Origin of Pair Production by Electric Field in de Sitter Space  

E-Print Network [OSTI]

The particle production in a de Sitter space provides an interesting model to understand the curvature effect on Schwinger pair production by a constant electric field or Schwinger mechanism on the de Sitter radiation. For that purpose, we employ the recently introduced complex analysis method, in which the quantum evolution in the complex time explains the pair production via the geometric transition amplitude and gives the pair-production rate as the contour integral. We compare the result by the contour integral with that of the phase-integral method.

Sang Pyo Kim

2014-04-15T23:59:59.000Z

331

Electric field induced localization phenomena in a ladder network with superlattice configuration: Effect of backbone environment  

SciTech Connect (OSTI)

Electric field induced localization properties of a tight-binding ladder network in presence of backbone sites are investigated. Based on Green's function formalism we numerically calculate two-terminal transport together with density of states for different arrangements of atomic sites in the ladder and its backbone. Our results lead to a possibility of getting multiple mobility edges which essentially plays a switching action between a completely opaque to fully or partly conducting region upon the variation of system Fermi energy, and thus, support in fabricating mesoscopic or DNA-based switching devices.

Dutta, Paramita; Karmakar, S. N. [Condensed Matter Physics Division, Saha Institute of Nuclear Physics, Sector-I, Block-AF, Bidhannagar, Kolkata-700 064 (India); Maiti, Santanu K., E-mail: santanu.maiti@isical.ac.in [Physics and Applied Mathematics Unit, Indian Statistical Institute, 203 Barrackpore Trunk Road, Kolkata-700 108 (India)

2014-09-15T23:59:59.000Z

332

On the efficiency of electrical submersible pumps equipped with variable frequency drives: A field study  

SciTech Connect (OSTI)

A field study was conducted on 18 electrical-submersible-pump- (ESP-) equipped wells operating in the Williston basin. Fifteen of these wells were run with variable frequency drives (VFD`s). The purpose of the study was to determine the efficiency and operating characteristics of ESP`s operating with VFD`s and compare them to those without. Voltage, current, power, and frequency were measured at the drive input, the drive output, and ESP input. Production data were recorded and power and efficiency were calculated at all measurement locations and compared to published data.

Patterson, M.M. [Patterson (Maurice M.), Hemphill, TX (United States)

1996-02-01T23:59:59.000Z

333

Volatile Profile and Sensory Evaluation of Tomato Juices Treated with Pulsed Electric Fields  

Science Journals Connector (OSTI)

A divinylbenzene/carboxen/polydimethylsiloxane fiber (DVB/CAR/PDMS, 50/30 mm, 2 cm long from Supelco Ltd., Bellefonte, PA, USA) was conditioned for 2 min, exposed to the sample headspace for 30 min, and immediately desorbed for 3 min at 250 °C in an Agilent 6890N Network gas chromatograph (Agilent Technologies, Palo Alto, CA, USA). ... Toepfl, S.; Mathys, A.; Heinz, V.; Knorr, D.Review: Potential of high hydrostatic pressure and pulsed electric fields for energy efficient and environmentally friendly food processing Food Rev. Int. ...

Anna Vallverdú-Queralt; Alessandra Bendini; Sara Barbieri; Giuseppe Di Lecce; Olga Martin-Belloso; Tullia Gallina Toschi

2013-02-02T23:59:59.000Z

334

Electric-field-induced turbulent energy cascade in an oil-in-oil emulsion  

E-Print Network [OSTI]

We observe electro-hydrodynamically driven turbulent flows at low Reynolds numbers in a two-fluid emulsion consisting of micron-scale droplets. In the presence of electric fields, the droplets produce interacting hydrodynamic flows which result in a dynamical organization at a spatial scale much larger than the size of the individual droplets. We characterize the dynamics associated with these structures by both video imaging and a simultaneous, in situ, measurement of the time variation of the bulk Reynolds stress with a rheometer. The results display scale invariance in the energy spectra in both space and time.

Varshney, Atul; Ghosh, Shankar; Yethiraj, Anand; Bhattacharya, S; Joshi, J B

2014-01-01T23:59:59.000Z

335

ELECTRIC  

Office of Legacy Management (LM)

ELECTRIC ELECTRIC cdrtrokArJclaeT 3 I+ &i, y$ \I &OF I*- j< t j,fci..- ir )(yiT !E-li, ( \-,v? Cl -p/4.4 RESEARCH LABORATORIES EAST PITTSBURGH, PA. 8ay 22, 1947 Mr. J. Carrel Vrilson General ?!!mager Atomic Qxzgy Commission 1901 Constitution Avenue Kashington, D. C. Dear Sir: In the course of OUT nuclenr research we are planning to study the enc:ri;y threshold anti cross section for fission. For thib program we require a s<>piAroted sample of metallic Uranium 258 of high purity. A quantity of at lezst 5 grams would probably be sufficient for our purpose, and this was included in our 3@icntion for license to the Atonic Energy Coskqission.. This license has been approved, 2nd rre would Llp!Jreciate informztion as to how to ?r*oceed to obtain thit: m2teria.l.

336

Electric dipole-forbidden nuclear transitions driven by super-intense laser fields  

E-Print Network [OSTI]

Electric dipole-forbidden transitions of nuclei interacting with super-intense laser fields are investigated considering stable isotopes with suitable low-lying first excited states. Different classes of transitions are identified, and all magnetic sublevels corresponding to the near-resonantly driven nuclear transition are included in the description of the nuclear quantum system. We find that large transition matrix elements and convenient resonance energies qualify nuclear M1 transitions as good candidates for the coherent driving of nuclei. We discuss the implications of resonant interaction of intense laser fields with nuclei beyond the dipole approximation for the controlled preparation of excited nuclear states and important aspects of possible experiments aimed at observing these effects.

Adriana Pálffy; Jörg Evers; Christoph H. Keitel

2008-04-14T23:59:59.000Z

337

An Adaptive Fast Multipole Higher Order Boundary Element Method for Power Frequency Electric Field of Substation  

Science Journals Connector (OSTI)

An adaptive fast multipole higher order boundary element method combining fast multipole (FM) with a higher order boundary element method is studied to solve the power frequency electric field (PFEF) of substations. In this new technique, the iterative equation solver GMRES is used in the FM, where matrix-vector multiplications are calculated using fast multipole expansions. The coefficients in the preconditioner for GMRES are stored and are used repeatedly in the direct evaluations of the near-field contributions. Then a 500kV outdoor substation is modeled and the PFEF of the substation is analyzed by the novel algorithm and other conventional methods. The results show that, in computational cost and the storages capability aspects, the algorithm proposed in this study has obvious advantages. It is suitable for the calculation of the large-scale PFEF in complex substations and the design of electromagnetic compatibility.

Zhang Zhan-Long; Deng Jun; Xiao Dong-Ping; He Wei; Tang Ju

2010-01-01T23:59:59.000Z

338

Large-scale electric fields resulting from magnetic reconnection in the corona  

SciTech Connect (OSTI)

The method of Forbes and Priest (2-D model) is applied to the large two-ribbon flare of July 29, 1973, for which both detailed H..cap alpha.. observations and magnetic data are available. For this flare the ribbons were long, nearly straight, and parallel to each other, and the 2-D model for the coronal field geometry may be adequate. The temporal profile E(t) is calculated and indicates that reconnection sets in at the beginning of the decay phase. From this time the electric field grows rapidly to a maximum value of about 2 V/cm within just a few minutes. Thereafter the decreases monotonically with time. 14 refs., 1 figs. (WRF)

Kopp, R.A.; Poletto, G.

1986-01-01T23:59:59.000Z

339

Stochastic Acceleration in Turbulent Electric Fields Generated by 3-D Reconnection  

E-Print Network [OSTI]

Electron and proton acceleration in three-dimensional electric and magnetic fields is studied through test particle simulations. The fields are obtained by a three-dimensional magnetohydrodynamic simulation of magnetic reconnection in slab geometry. The nonlinear evolution of the system is characterized by the growth of many unstable modes and the initial current sheet is fragmented with formation of small scale structures. We inject at random points inside the evolving current sheet a Maxwellian distribution of particles. In relatively short time (less than a millisecond) the particles develop a power law tail. The acceleration is extremely efficient and the electrons absorb a large percentage of the available energy in a small fraction of the characteristic time of the MHD simulation, suggesting that resistive MHD codes, used extensively in the current literature, are unable to represent the full extent of particle acceleration in 3D reconnection.

Marco Onofri; Heinz Isliker; Loukas Vlahos

2006-04-10T23:59:59.000Z

340

Electric-dipole-forbidden nuclear transitions driven by super-intense laser fields  

Science Journals Connector (OSTI)

Electric-dipole-forbidden transitions of nuclei interacting with super-intense laser fields are investigated by considering stable isotopes with suitable low-lying first excited states. Different classes of transitions are identified, and all magnetic sublevels corresponding to the near-resonantly driven nuclear transition are included in the description of the nuclear quantum system. We find that large transition matrix elements and convenient resonance energies qualify nuclear M1 transitions as good candidates for the coherent driving of nuclei. We discuss the implications of resonant interaction of intense laser fields with nuclei beyond the dipole approximation for the controlled preparation of excited nuclear states and important aspects of possible experiments aimed at observing these effects.

Adriana Pálffy, Jörg Evers, and Christoph H. Keitel

2008-04-11T23:59:59.000Z

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


341

Phase-field simulation of electric-field-induced in-plane magnetic domain switching in magnetic/ferroelectric layered heterostructures  

E-Print Network [OSTI]

Phase-field simulation of electric-field-induced in-plane magnetic domain switching in magnetic. Phys. Lett. 99, 182510 (2011) Quantum tunneling of the Bloch point in a magnetic film with strong uniaxial magnetic anisotropy Low Temp. Phys. 37, 690 (2011) Evolution of magnetic bubble domains

Chen, Long-Qing

342

Dependence of carrier mobility on an electric field in gallium selenide crystals  

SciTech Connect (OSTI)

The dependence of the mobility of charge carriers on voltage has been studied in undoped GaSe single crystals and crystals doped with gadolinium; the latter crystals have exhibited various values of dark resistivity ({rho}{sub d.r} Almost-Equal-To 10{sup 4}-10{sup 8} {Omega} cm at 77 K) and of the doping level (N = 10{sup -5}, 10{sup -4}, 10{sup -3}, 10{sup -2}, and 10{sup -1} at %). It is established that the dependence of the charge-carrier mobility on the electric field applied to the sample E {<=} 10{sup 2} V/cm is observed in undoped high-resistivity GaSe crystals ({rho}{sub d.r} {>=} 10{sup 4} {Omega} cm) and in lightly doped GaSe crystals (N {<=} 10{sup -2} at %) in the region of T {<=} 150 K. It is found that this dependence is not related to heating of the charge carriers by an electric field; rather, it is caused by elimination of drift barriers as a result of injection.

Abdinov, A. Sh., E-mail: abdinov_axmed@yahoo.com; Babaeva, R. F., E-mail: Babaeva-Rena@yandex.ru; Rzayev, R. M. [Baku State University (Azerbaijan)

2012-06-15T23:59:59.000Z

343

Ultrathin Palladium Membranes Prepared by a Novel Electric Field Assisted Activation  

SciTech Connect (OSTI)

Ultra-thin Pd composite membranes with a thickness of 1 ?m were prepared by a novel electric-field assisted activation technique followed by electroless deposition of Pd on a hollow-fiber ?-alumina support. The novel activation method places Pd precursors and a reducing agent on opposite sides of a porous substrate and uses an electric field to cause migration of Pd ions to the outer surface where they are reduced to form seeds in high density in a narrow spatial region. The resulting membranes showed a high hydrogen permeance in the range of 4.0–5.0 × 10{sup ?6} mol m{sup ?2} s{sup ?1} Pa{sup ?1} and stable H{sub 2}/N{sub 2} selectivity of 3000–9000 during stability tests for 150 h at 733 K with H{sub 2} flow. The formation of the thin, defect-less and robust Pd layer can be ascribed to the evenly distributed Pd seeds on the support layer and the enhanced bonding between the Pd layer and the support layer resulting from the strong anchoring of the Pd seeds onto the support in the new activation step.

Yun, Samhun; Ko, Joon Ho; Oyama, S. Ted

2011-03-01T23:59:59.000Z

344

Geochemistry of hydrothermal fluids from Axial Seamount Hydrothermal Emissions Study vent field, Juan de Fuca Ridge: Subseafloor boiling and subsequent fluid-rock interaction  

SciTech Connect (OSTI)

Hydrothermal fluids collected from the ASHES vent field in 1986, 1987, and 1988 exhibit a very wide range of chemical composition over a small area ({approximately} 60 m in diameter). Compositions range from a 300C, gas-enriched (285 mmol/kg CO{sub 2}), low-chlorinity ({approximately} 33% of seawater) fluid to a 328C, relatively gas-depleted (50 mmol/kg CO{sub 2}), high-chlorinity ({approximately} 116% of seawater) fluid. The entire range of measured compositions at ASHES is best explained by a single hydrothermal fluid undergoing phase separation while rising through the ocean crust, followed by partial segregation of the vapor and brine phases. Other mechanisms proposed to produce chlorinity variations in hydrothermal fluids (precipitation/dissolution of a chloride-bearing mineral or crustal hydration) cannot produce the covariation of chlorinity and gas content observed at ASHES. There is good argument of the measured fluid compositions generated by a simple model of phase separation, in which gases are partitioned according to Henry's law and all salt remains in the liquid phase. Significant enrichments in silica, lithium and boron in the low-chlorinity fluids over levels predicted by the model are attributed to fluid-rock interaction in the upflow zone. Depletions in iron and calcium suggest that these elements have been removed by iron-sulfide and anhydrite precipitation at some time in the history of the low-chlorinity fluids. The distribution of low- and high-chlorinity venting is consistent with mechanisms of phase segregation based on differential buoyancy or relative permeability. The relatively shallow depth of the seafloor (1,540 m) and the observed chemistry of ASHES fluids are consistent with phase separation in the sub-critical or near-critical region.

Butterfield, D.A.; McDuff, R.E.; Lilley, M.D. (Univ. of Washington, Seattle (United States)); Massoth, G.J. (NOAA, Seattle, WA (United States)); Lupton, J.E. (Univ. of California, Santa Barbara (United States))

1990-08-10T23:59:59.000Z

345

Occupational and residential 60-Hz electromagnetic fields and high-frequency electric transients: exposure assessment using a new dosimeter  

SciTech Connect (OSTI)

One problem that has limited past epidemiologic studies of cancer and exposure to extremely low-frequency (0-100 Hz) electric and magnetic fields has been the lack of adequate methods for assessing personal exposure to these fields. A new 60-Hz electromagnetic field dosimeter was tested to assess occupational and residential exposures of a group of electrical utility workers and a comparison background group over a 7-day period. Comparing work periods only, utility workers' exposures were significantly higher than background levels by a factor of about 10 for electric (E) and magnetic (B) fields and by a factor of 171 for high-frequency transient electric (HFTE) fields. When overall weekly time-weighted averages combining work and nonwork exposures were compared, ratios of the exposed to background groups were lower. B and HFTE exposure ratios remained statistically significant, with values of 3.5 and 58, respectively, whereas the electric field exposure ratio was no longer significant, with a value of 1.7. E-field exposures of the background group were the highest during the nonwork period, probably reflecting the use of electrical appliances at home. Residential E- and B-field exposures were in the same range as published results from other surveys, whereas occupational E-field exposures tended to be lower than exposures reported in other studies. The high variability associated with occupational exposures probably accounts for the latter discrepancy. Worker acceptance of wearing the dosimeter was good: 95% of participants found it to be of little or no inconvenience while at work. At home, 37% found the device to be inconvenient in its present form but would not object to wearing a slightly smaller and lighter dosimeter.

Deadman, J.E.; Camus, M.; Armstrong, B.G.; Heroux, P.; Cyr, D.; Plante, M.; Theriault, G.

1988-08-01T23:59:59.000Z

346

Charged massive particle at rest in the field of a Reissner-Nordström black hole. II. Analysis of the field lines and the electric Meissner effect  

Science Journals Connector (OSTI)

The properties of the electric field of a two-body system consisting of a Reissner-Nordström black hole and a charged massive particle at rest have recently been analyzed in the framework of first order perturbation theory following the standard approach of Regge, Wheeler, and Zerilli. In the present paper we complete this analysis by numerically constructing and discussing the lines of force of the “effective” electric field of the sole particle with the subtraction of the dominant contribution of the black hole. We also give the total field due to the black hole and the particle. As the black hole becomes extreme an effect analogous to the Meissner effect arises for the electric field, with the “effective field” lines of the point charge being expelled by the outer horizon of the black hole. This effect existing at the level of test field approximation, i.e. by neglecting the backreaction on the background metric and electromagnetic field due to the particle’s mass and charge, is here found also at the complete perturbative level. We point out analogies with similar considerations for magnetic fields by Bi?ák and Dvo?ák. We also explicitly show that the linearization of the recently obtained Belinski-Alekseev exact solution coincides with our solution in the Regge-Wheeler gauge. Our solution thus represents a bridge between the test field solution, which neglects all the feedback terms, and the exact two-body solution, which takes into account all the nonlinearity of the interaction.

D. Bini; A. Geralico; R. Ruffini

2008-03-17T23:59:59.000Z

347

Calcite precipitation dominates the electrical signatures of zero valent iron columns under simulated field conditions  

E-Print Network [OSTI]

of the electrical signatures from magnetite/fougerite vs.electrical properties of the different mineralogies: i.e. conductive and polarizable magnetite/fougerite vs.

Wu, Yuxin

2009-01-01T23:59:59.000Z

348

Short-term electricity dispatch optimization of Ertan hydropower plant based on data by field tests  

Science Journals Connector (OSTI)

A short-term electricity dispatch optimization program required by the Ertan hydropower plant is developed to maximize hydropower production. Three field tests in various operating heads were carried out in the period of May 2009 to March 2010. Based on data of five test conditions three operating zones for units in various operating heads were proposed. A short-term electricity dispatch optimization model was developed with physical and operational constraints. Unit commitment strategy was put forward for model solution in which unit statuses and output statuses were classified. The strategy aimed at formulating better unit commitment plan according to forecasted load demand ancillary service requirements and initial operating status. The model and the strategy were verified by real cases. The results show that the optimal load distribution among units at every interval can be easily solved by the genetic algorithm based on a fixed unit commitment plan. Schedules are developed with higher average generation efficiency. Units can also be scheduled to operate for a less time within the rough zone and the second feasible zone. The proposed method is already operational for dispatch engineers of the Ertan hydropower plant to determine half-hourly schedules in one day.

Chao Ma; Haijun Wang; Jijian Lian

2011-01-01T23:59:59.000Z

349

Toward scalable information processing with ultracold polar molecules in an electric field: A numerical investigation  

SciTech Connect (OSTI)

We numerically investigate the possibilities of driving quantum algorithms with laser pulses in a register of ultracold NaCs polar molecules in a static electric field. We focus on the possibilities of performing scalable logical operations by considering circuits that involve intermolecular gates (implemented on adjacent interacting molecules) to enable the transfer of information from one molecule to another during conditional laser-driven population inversions. We study the implementation of an arithmetic operation (the addition of 0 or 1 on a binary digit and a carry in) which requires population inversions only and the Deutsch-Jozsa algorithm which requires a control of the phases. Under typical experimental conditions, our simulations show that high-fidelity logical operations involving several qubits can be performed in a time scale of a few hundreds of microseconds, opening promising perspectives for the manipulation of a large number of qubits in these systems.

Bomble, Laeetitia; Pellegrini, Philippe; Ghesquiere, Pierre [Laboratoire de Chimie Physique, Universite Paris-Sud, UMR 8000, Orsay F-91405 (France); Desouter-Lecomte, Michele [Laboratoire de Chimie Physique, Universite Paris-Sud, UMR 8000, Orsay F-91405 (France); Departement de Chimie, Universite de Liege, Bat B6c Sart Tilman, B-4000 Liege Belgium (Belgium)

2010-12-15T23:59:59.000Z

350

Finite-geometry models of electric field noise from patch potentials in ion traps  

SciTech Connect (OSTI)

We model electric field noise from fluctuating patch potentials on conducting surfaces by taking into account the finite geometry of the ion trap electrodes to gain insight into the origin of anomalous heating in ion traps. The scaling of anomalous heating rates with surface distance d is obtained for several generic geometries of relevance to current ion trap designs, ranging from planar to spheroidal electrodes. The influence of patch size is studied both by solving Laplace's equation in terms of the appropriate Green's function as well as through an eigenfunction expansion. Scaling with surface distance is found to be highly dependent on the choice of geometry and the relative scale between the spatial extent of the electrode, the ion-electrode distance, and the patch size. Our model generally supports the d{sup -4} dependence currently found by most experiments and models, but also predicts geometry-driven deviations from this trend.

Low, Guang Hao [MIT-Harvard Center for Ultracold Atoms, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Department of Physics, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge, CB3 0HE (United Kingdom); Herskind, Peter F.; Chuang, Isaac L. [MIT-Harvard Center for Ultracold Atoms, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2011-11-15T23:59:59.000Z

351

Very-low-frequency and low-frequency electric and magnetic fields associated with electric shuttle bus wireless charging  

Science Journals Connector (OSTI)

......the charging process brings the batteries up to 90 per cent of the full...the test track to reduce the battery's SOC to between 60 and 70...2012) EVS26 International Battery, Hybrid and Fuel Cell Electric Vehicle Symposium......

R.A. Tell; Robert Kavet; J.R. Bailey; John Halliwell

2014-01-01T23:59:59.000Z

352

Ubiquity of chaotic magnetic-field lines generated by three-dimensionally crossed wires in modern electric circuits  

Science Journals Connector (OSTI)

We investigate simple three-dimensionally crossed wires carrying electric currents which generate chaotic magnetic-field lines (CMFLs). As such wire systems, cross-ring and perturbed parallel-ring wires are studied, since topologically equivalent configurations to these systems can often be found in contemporary electric and integrated circuits. For realistic fundamental wire configurations, the conditions for wire dimensions (size) and current values to generate CMFLs are numerically explored under the presence of the weak but inevitable geomagnetic field. As a result, it is concluded that CMFLs can exist everywhere; i.e., they are ubiquitous in the modern technological world.

M. Hosoda; T. Miyaguchi; K. Imagawa; K. Nakamura

2009-12-21T23:59:59.000Z

353

The relation between reconnected flux, the parallel electric field, and the reconnection rate in a three-dimensional kinetic simulation of magnetic reconnection  

SciTech Connect (OSTI)

We investigate the distribution of parallel electric fields and their relationship to the location and rate of magnetic reconnection in a large particle-in-cell simulation of 3D turbulent magnetic reconnection with open boundary conditions. The simulation's guide field geometry inhibits the formation of simple topological features such as null points. Therefore, we derive the location of potential changes in magnetic connectivity by finding the field lines that experience a large relative change between their endpoints, i.e., the quasi-separatrix layer. We find a good correspondence between the locus of changes in magnetic connectivity or the quasi-separatrix layer and the map of large gradients in the integrated parallel electric field (or quasi-potential). Furthermore, we investigate the distribution of the parallel electric field along the reconnecting field lines. We find the reconnection rate is controlled by only the low-amplitude, zeroth and first–order trends in the parallel electric field while the contribution from fluctuations of the parallel electric field, such as electron holes, is negligible. The results impact the determination of reconnection sites and reconnection rates in models and in situ spacecraft observations of 3D turbulent reconnection. It is difficult through direct observation to isolate the loci of the reconnection parallel electric field amidst the large amplitude fluctuations. However, we demonstrate that a positive slope of the running sum of the parallel electric field along the field line as a function of field line length indicates where reconnection is occurring along the field line.

Wendel, D. E.; Olson, D. K.; Hesse, M.; Kuznetsova, M.; Adrian, M. L. [NASA Goddard Space Flight Center, Greenbelt, Maryland 20771 (United States)] [NASA Goddard Space Flight Center, Greenbelt, Maryland 20771 (United States); Aunai, N. [Institute for Research in Astrophysics and Planetology, University Paul Sabatier, Toulouse (France)] [Institute for Research in Astrophysics and Planetology, University Paul Sabatier, Toulouse (France); Karimabadi, H. [SciberQuest, Inc., Del Mar, California 92014 (United States) [SciberQuest, Inc., Del Mar, California 92014 (United States); Department of Computer and Electrical Engineering, University of California, San Diego, La Jolla, California 92093 (United States); Daughton, W. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

2013-12-15T23:59:59.000Z

354

Charged massive particle at rest in the field of a Reissner-Nordström black hole. II. Analysis of the field lines and the electric Meissner effect  

E-Print Network [OSTI]

The properties of the electric field of a two-body system consisting of a Reissner-Nordstr\\"om black hole and a charged massive particle at rest have recently been analyzed in the framework of first order perturbation theory following the standard approach of Regge, Wheeler and Zerilli. In the present paper we complete this analysis by numerically constructing and discussing the lines of force of the "effective" electric field of the sole particle with the subtraction of the dominant contribution of the black hole. We also give the total field due to the black hole and the particle. As the black hole becomes extreme an effect analogous to the Meissner effect arises for the electric field, with the "effective field" lines of the point charge being expelled by the outer horizon of the black hole. This effect existing at the level of test field approximation, i.e. by neglecting the backreaction on the background metric and electromagnetic field due to the particle's mass and charge, is here found also at the complete perturbative level. We point out analogies with similar considerations for magnetic fields by Bi{\\v c}\\'ak and Dvo{\\v r}\\'ak. We also explicitly show that the linearization of the recently obtained Belinski-Alekseev exact solution coincides with our solution in the Regge-Wheeler gauge. Our solution thus represents a "bridge" between the test field solution, which neglects all the feedback terms, and the exact two-body solution, which takes into account all the non-linearity of the interaction.

Donato Bini; Andrea Geralico; Remo Ruffini

2014-08-20T23:59:59.000Z

355

MHK Technologies/Current Electric Generator | Open Energy Information  

Open Energy Info (EERE)

Generator Generator < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Current Electric Generator.jpg Technology Profile Primary Organization Current Electric Technology Resource Click here Current Technology Type Click here Axial Flow Turbine Technology Readiness Level Click here TRL 1 3 Discovery Concept Def Early Stage Dev Design Engineering Technology Description The Current Electric Generator will create electricity in three different processes simultaniously by harnessing the motion of water current to rotate the generator Two forms of magnetic induction and solar cells on the outer housing will produce electricity very efficiently The generators will be wired up together in large fields on open waterways sumerged from harm The electricity will be sent back to mainland via an underwater wire for consumption The Current Electric Generator is designed with the environment in mind and will primarilly be constructed from recycled materials cutting emmisions cost

356

Asymptotically locally AdS and flat black holes in the presence of an electric field in the Horndeski scenario  

E-Print Network [OSTI]

Asymptotically locally AdS and asymptotically flat black hole solutions are found for a particular case of the Horndeski action. The action contains the Einstein-Hilbert term with a cosmological constant, a real scalar field with a non minimal kinetic coupling given by the Einstein tensor, the minimal kinetic coupling and the Maxwell term. There is no scalar potential. The solution has two integration constants related with the mass and the electric charge. The solution is given for all dimensions. A new class of asymptotically locally flat spherically symmetric black holes is found when the minimal kinetic coupling vanishes and the cosmological constant is present. In this case we get a solution which represents an electric Universe. The electric field at infinity is only supported by $\\Lambda$. When the cosmological constant vanishes the black hole is asymptotically flat.

Adolfo Cisterna; Cristián Erices

2014-03-03T23:59:59.000Z

357

Robotics Minor Robotics is a truly interdisciplinary minor, involving expertise in the fields of computer science, electrical  

E-Print Network [OSTI]

Robotics Minor Robotics is a truly interdisciplinary minor, involving expertise in the fields-requisites to the minor courses: Calculus I, Calculus II, Physics I, and Physics II or electricity. Robotics Minor.265 Logic Design 16.317 Microprocessors Systems Design I 22.211 Statics 22.213 Dynamics 22.579 Robotics

Massachusetts at Lowell, University of

358

ASA conference on radiation and health: Health effects of electric and magnetic fields: Statistical support for research strategies. Final report  

SciTech Connect (OSTI)

This report is a collection of papers documenting presentations made at the VIII ASA (American Statistical Association) Conference on Radiation and Health entitled Health Effects of Electric and Magnetic Fields: Statistical Support for Research Strategies. Individual papers are abstracted and indexed for the database.

Not Available

1990-05-01T23:59:59.000Z

359

Measured electric and magnetic fields from an unusual cloud-to-ground lightning flash containing two positive  

E-Print Network [OSTI]

Measured electric and magnetic fields from an unusual cloud-to-ground lightning flash containing at multiple stations between about 300 and 800 m of a cloud-to-ground ``bipolar'' lightning flash containing an unusual cloud-to-ground lightning flash containing two positive strokes followed by four negative strokes

Florida, University of

360

Electric field as pretreatment to enhance the activity of a whole-cell biocatalyst for hydrocarbon degradation in contaminated water  

Science Journals Connector (OSTI)

Abstract In this paper, a method using two successive cultures, solid then liquid, for the production and use of a hydrocarbon degrading biocatalyst (BC) is proposed. Hexadecane (HXD) was used as a model hydrocarbon. An electric field was applied during the solid state culture (SSC) as a novel approach, denoted the electric field pretreatment, to enhance the HXD degrading activity. Afterward, the catalytic activity (CA) was determined in liquid culture. The CA of the biocatalyst pretreated and untreated was evaluated, discriminating between sorption capacity and HXD degradation rate; biomass production on the electric field pretreated biocatalyst was only 20% of that on the untreated biocatalyst, but the maximum biocatalyst sorption capacity was enhanced from 119 ± 41 mg (g BC)?1 to 207 ± 23 mg (g BC)?1 by the effect of the electric field pretreatment. The activity of the biocatalyst was mainly associated with the pretreated fungal biomass; its activity was 9-fold higher than that of the untreated biomass. Linear model was used to obtain the affinity constant and Langmuir to adjust maximum sorption capacity. This enhancement in sorption capacity was associated with the high HXD degradation rate observed here; 86% of the initial HXD was eliminated in 42 h by the pretreated biocatalyst, whilst 53% was eliminated in 48 h by the untreated biocatalyst.

V. Sánchez-Vázquez; I. González; M. Gutiérrez-Rojas

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "axial electric field" from the National Library of EnergyBeta (NLEBeta).
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361

Coaction of electric field induced strain and polarization effects in La0.7Ca0.3MnO3/PMN-PT structures  

Science Journals Connector (OSTI)

The coaction of the electric field induced strain and polarization effect on magnetic and electrical properties in field-effect structures, composing of La0.7Ca0.3MnO3 (LCMO) films and Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) crystal, have been studied. The strain state of the films can continuously be tuned by application of bias electric field. The resistance variation in LCMO film is about ?4.34% and +3.48% when a negative (?8?kV/cm) and positive (+8?kV/cm) bias field is applied, respectively, at 50 K. With increasing temperature, the field-dependent shuttlelike loop of relative resistance changes to butterflylike hysteresis loop under the coaction of field induced strain and polarization effect. Moreover, a sharp, stable, and reversal magnetization controlling effect caused by electric field has also been found in the structure. The magnetization decreases as much as ?8.64% when a positive field 9.6 kV/cm is applied at 10 K. The data clearly show that the electric field induced strain effect is dominant for the magnetization, while the polarization is dominant for the effect on electrical transport properties when the LCMO is in ferromagnetic metal state. These results reveal that the electric field can tune the lattice distortion and carry distribution artificially as well as magnetic and electrical properties by using manganite/PMN-PT structure.

Z. G. Sheng; J. Gao; Y. P. Sun

2009-05-29T23:59:59.000Z

362

Electric and Magnetic Fields Research and Public Information Dissemination Program annual report for fiscal year 1996  

SciTech Connect (OSTI)

The Electric and Magnetic Fields (EMF) Research and Public Information Dissemination (RAPID) Program was authorized by the Energy Policy Act of 1992 as a near-term effort to expand and accelerate the research needed to address the EMF issue. As required by this legislation, the EMF Interagency Committee, the National EMF Advisory Committee (NEMFAC), and the National Academy of Sciences (NAS) are providing valued input and advice for the direction of this program. With this input and advice, the Department of Energy (DOE) and the National Institute of Environmental Health Sciences (NIEHS) have developed and are implementing five-year program plans. Multi-year health effects research projects and related EMF measurement and exposure assessment projects are underway using funds appropriated in fiscal years 1994, 1995, and 1996 together with voluntary non-Federal contributions. The results of these research projects, along with the results of other EMF research, will be used as input to the hazard evaluation effort, which is the focus of the EMF RAPID Program. A coordinated interagency program is underway to communicate needed information on the EMF issue in a clear manner to the public and other decision makers.

NONE

1997-06-01T23:59:59.000Z

363

Electric dipole and quadrupole properties of In$^{+}$ and Sr using finite field calculation  

E-Print Network [OSTI]

The electric dipole and quadrupole properties of two frequency-standard candidates In$^{+}$ and Sr are calculated by using the finite-field approach. We reproduce the dipole polarizability of the 5s$^2$ $^1S^e_0$ and 5s5p $^3P^o_0$ of In$^+$ and Sr with an excellent agreement with the previously recommended data. Besides, the scalar and tensor dipole polarizabilities for $5s5p$ $^3P^o_{1,2}$ of In$^+$ and Sr and the second dipole hyperpolarizability for In$^+$ 5s$^2$ $^1S^e_0$ and 5s5p $^3P^o_{0,1,2}$ are given. The uncertainty is controlled down to around 1-4\\% for In$^+$ and 2-6\\% for Sr by increasing the basis-set and electronic-correlation levels hierarchically. The importance of the spin-orbit coupling effect is analyzed by comparing the spin-dependent and spin-free results. The dipole polarizability of In$^{+}$ demonstrates stronger dependency on the spin-orbit coupling effect than Sr. The quadrupole moment and quadrupole polarizabilities of 5s$^2$ $^1S^e_0$ and 5s5p $^3P^o_{0,1,2}$ are also given. Fina...

Yu, Yan-mei; Feng, Hui-hui; Fan, Heng; Liu, Wu-Ming

2015-01-01T23:59:59.000Z

364

Direct, spectroscopic measurement of electric fields in a plasma-RF antenna interaction region in Tore Supra  

SciTech Connect (OSTI)

Balmer-series spectral line profiles of deuterium emission near a lower-hybrid (3.7 GHz) wave, high power (1-4 MW) launcher were measured with high-spectral resolution in the Tore Supra tokamak and fitted to an atomic physics model which includes both Zeeman and dynamic Stark effects. The magnetic field is static and the electric field is assumed to be monochromatic at 3.7 GHz. The determined strength and direction of the high-frequency electric field is found to be in good agreement with the results of a simulation that computes the propagation of these lower hybrid waves into the plasma in the region around the launch antenna and specifically in the region of estimated peak emission contributing to the measurement. This agreement indicates feasibility for the use of dynamic Stark effect spectroscopy to study interaction at the plasma antenna interactions in a fusion plasma environment. (C) 2013 Elsevier B. V. All rights reserved.

Klepper, C Christopher [ORNL] [ORNL; Hillis, Donald Lee [ORNL] [ORNL; Isler, Ralph C [ORNL] [ORNL; Hillairet, J. [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM)] [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM); Martin, E. H. [North Carolina State University] [North Carolina State University; Colas, L. [French Atomic Energy Commission (CEA), Cadarache, St. Paul lez Durance] [French Atomic Energy Commission (CEA), Cadarache, St. Paul lez Durance; Ekedahl, A. [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM)] [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM); Goniche, M. [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM)] [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM); Lotte, Ph. [French Atomic Energy Commission (CEA), Cadarache, St. Paul lez Durance] [French Atomic Energy Commission (CEA), Cadarache, St. Paul lez Durance; Colledani, G. [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM)] [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM); Martin, V. [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM)] [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM); Panayotis, Stephanie [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM)] [French Atomic Energy Commission (CEA), Institute for Magnetic Fusion Research (IRFM); Pegourie, B. [French Atomic Energy Commission (CEA), Cadarache, St. Paul lez Durance] [French Atomic Energy Commission (CEA), Cadarache, St. Paul lez Durance; Harris, Jeffrey H [ORNL] [ORNL

2013-01-01T23:59:59.000Z

365

Technical Digest of International Electron Devices Meeting 2001 pp. 363-366 Generation of Large-area Tunable Uniform Electric Fields in Microfluidic Arrays for  

E-Print Network [OSTI]

-area Tunable Uniform Electric Fields in Microfluidic Arrays for Rapid DNA Separation L. Richard Huang*, Jonas O molecules in microfluidic systems. In this paper we present a novel method for generating tunable uniform electric fields over large microfluidic arrays in two dimensions, and its application to a microfabricated

366

Intense 2.3-Hz electric field pulsations in the stratosphere at high auroral latitude  

SciTech Connect (OSTI)

A survey has been performed of the power spectra of the electric field measured by stratospheric balloon-borne instruments during the 1985-1986 South Pole Balloon Campaign. The survey reviewed all 468 hours of available data and covered the frequency range from 0 to 4 Hz. Three episodes of narrow-band emissions were detected in this frequency range. These narrow-band emissions had frequencies in the horizontal component between 2 and 2.5 Hz. The frequencies observed in the vertical component were different, with several bands present. The fundamental frequency in the vertical component was around 0.8 to 1.4 Hz depending on event. The spectra of the events in the vertical component showed multiple emission bands, not all harmonically spaced. The vertical component showed much more pronounced time variations of the frequencies of the emission bands than the horizontal component showed. The ratio E{sub V}/E{sub H} was typically {approximately}2-3. The amplitude of the horizontal components of the emissions was quite large in one of the three events, with individual bursts having amplitudes of 60 mV/m. The polarization was complicated. An extensive list of possible explanations for these emissions was considered. Distant sources associated with tropospheric storms were considered in detail. During the most intense of the 2-Hz emission events, the nearest bad weather was more than 1000 km away. It proved impossible to account for the amplitude and polarization of the horizontal component with any reasonable tropospheric source. Explaining the narrow-band tuning was also a problem for any weather source model. An ionospheric model based on the concept of the ionospheric Alfven resonator is capable of accounting for the tuning, amplitude, and polarization of the horizontal components. However, this model has moderate difficulty in accounting for the observed vertical component of the emissions. 36 refs., 15 figs., 6 tabs.

Bering, E.A.; Benbrook, J.R. [Univ. of Houston, TX (United States)] [Univ. of Houston, TX (United States)

1995-05-01T23:59:59.000Z

367

PILOT-SCALE FIELD VALIDATION OF THE LONG ELECTRODE ELECTRICAL RESISTIVITY TOMOGRAPHY METHOD  

SciTech Connect (OSTI)

Field validation for the long electrode electrical resistivity tomography (LE-ERT) method was attempted in order to demonstrate the performance of the technique in imaging a simple buried target. The experiment was an approximately 1/17 scale mock-up of a region encompassing a buried nuclear waste tank on the Hanford site. The target of focus was constructed by manually forming a simulated plume within the vadose zone using a tank waste simulant. The LE-ERT results were compared to ERT using conventional point electrodes on the surface and buried within the survey domain. Using a pole-pole array, both point and long electrode imaging techniques identified the lateral extents of the pre-formed plume with reasonable fidelity, but the LE-ERT was handicapped in reconstructing the vertical boundaries. The pole-dipole and dipole-dipole arrays were also tested with the LE-ERT method and were shown to have the least favorable target properties, including the position of the reconstructed plume relative to the known plume and the intensity of false positive targets. The poor performance of the pole-dipole and dipole-dipole arrays was attributed to an inexhaustive and non-optimal coverage of data at key electrodes, as well as an increased noise for electrode combinations with high geometric factors. However, when comparing the model resolution matrix among the different acquisition strategies, the pole-dipole and dipole-dipole arrays using long electrodes were shown to have significantly higher average and maximum values than any pole-pole array. The model resolution describes how well the inversion model resolves the subsurface. Given the model resolution performance of the pole-dipole and dipole-dipole arrays, it may be worth investing in tools to understand the optimum subset of randomly distributed electrode pairs to produce maximum performance from the inversion model.

GLASER DR; RUCKER DF; CROOK N; LOKE MH

2011-07-14T23:59:59.000Z

368

New Solutions of the $2+1$ Dimensional Einstein Gravity Coupled to Maxwell Power type Non Linear Electric field with Dilaton field  

E-Print Network [OSTI]

New solutions are derived in the $2+1$ gravity which is coupled to $|{\\cal F}|^k$ type non-linear electric field in Maxwell Power theory with dilaton field. We obtain consistent solutions in general $k$ case. We also investigate the behavior of the metric function with the space-time singularity. Then, we found some black hole solutions when the space-time has a singular point at $r=0$. Addition, we derive the Brown-York mass when the space-time represents black hole.

Masashi Kuniyasu

2015-01-27T23:59:59.000Z

369

The effect of applied electric field on pulsed radio frequency and pulsed direct current plasma jet array  

SciTech Connect (OSTI)

Here we compare the plasma plume propagation characteristics of a 3-channel pulsed RF plasma jet array and those of the same device operated by a pulsed dc source. For the pulsed-RF jet array, numerous long life time ions and metastables accumulated in the plasma channel make the plasma plume respond quickly to applied electric field. Its structure similar as 'plasma bullet' is an anode glow indeed. For the pulsed dc plasma jet array, the strong electric field in the vicinity of the tube is the reason for the growing plasma bullet in the launching period. The repulsive forces between the growing plasma bullets result in the divergence of the pulsed dc plasma jet array. Finally, the comparison of 309 nm and 777 nm emissions between these two jet arrays suggests the high chemical activity of pulsed RF plasma jet array.

Hu, J. T.; Liu, X. Y.; Liu, J. H.; Xiong, Z. L.; Liu, D. W.; Lu, X. P. [National State Key Lab of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, WuHan, Hubei 430074 (China); Iza, F.; Kong, M. G. [Department of Electronic and Electrical Engineering, Loughborough University, Leicestershire LE11 3TU (United Kingdom)

2012-06-15T23:59:59.000Z

370

Determination of deuteron quadrupole moment from calculations of the electric field gradient in D{sub 2} and HD  

SciTech Connect (OSTI)

We have carried out an accurate determination of the quadrupole moment of the deuteron nucleus. The evaluation of the constant is achieved by combining high accuracy Born-Oppenheimer calculations of the electric field gradient at the nucleus in the H{sub 2} molecule with spectroscopic measurements of the quadrupolar splitting in D{sub 2} and HD. The derived value is Q=0.285783(30) fm{sup 2}.

Pavanello, Michele; Tung Weicheng; Adamowicz, Ludwik [Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721 (United States)

2010-04-15T23:59:59.000Z

371

Coupled plasma waves in a system of two two-dimensional superlattices in the presence of a quantizing electric field  

SciTech Connect (OSTI)

The effect of a dc electric field on coupled plasma waves in a system of two two-dimensional super-lattices is studied. In the case of high temperatures, a dispersion relation is obtained and the fundamental and resonant modes of the plasma waves are numerically studied. The calculations are performed based on the quantum theory of plasma waves in the random phase approximation taking into account umklapp processes.

Glazov, S. Yu., E-mail: ser-glazov@yandex.ru; Kubrakova, E. S. [Volgograd State Social Pedagogical University (Russian Federation)] [Volgograd State Social Pedagogical University (Russian Federation); Mescheryakova, N. E. [Volgograd Institute of Business (Russian Federation)] [Volgograd Institute of Business (Russian Federation)

2013-10-15T23:59:59.000Z

372

Hydrogen atom in crossed electric and magnetic fields: Phase space topology and torus quantization via periodic orbits  

E-Print Network [OSTI]

A hierarchical ordering is demonstrated for the periodic orbits in a strongly coupled multidimensional Hamiltonian system, namely the hydrogen atom in crossed electric and magnetic fields. It mirrors the hierarchy of broken resonant tori and thereby allows one to characterize the periodic orbits by a set of winding numbers. With this knowledge, we construct the action variables as functions of the frequency ratios and carry out a semiclassical torus quantization. The semiclassical energy levels thus obtained agree well with exact quantum calculations.

Stephan Gekle; Jörg Main; Thomas Bartsch; T. Uzer

2006-10-02T23:59:59.000Z

373

Heat Production of Free Fermions Subjected to Electric Fields in Disordered Media  

E-Print Network [OSTI]

Siqueira Pedra C. Kurig March 21, 2013 Abstract Electric resistance in conducting media is related to heat two species is modeled by perfectly elastic random collisions. This quite elementary model explains

374

Quark mass dependence of the vacuum electric conductivity induced by the magnetic field in SU(2) lattice gluodynamics  

SciTech Connect (OSTI)

We study the electric conductivity induced by the magnetic field B in quenched SU(2) lattice gauge theory at a finite temperature below the deconfinement phase transition as a function of the bare quark mass m{sub q} in the range m{sub q}=55 MeV...540 MeV. At fixed quark mass, the conductivity grows linearly with the magnetic field strength |B|. The proportionality coefficient in this dependence increases towards smaller quark masses and seems to saturate at some finite value in the zero-mass limit. The nonanalytic dependence on the field strength might result from the mixing between vector mesons and pions in an external magnetic field. We discuss the implications of our results for dilepton angular distributions in heavy-ion collisions.

Buividovich, P. V. [ITEP, 117218 Russia, Moscow, B. Cheremushkinskaya str. 25 (Russian Federation); JINR, 141980 Russia, Moscow Region, Dubna, Joliot-Curie str. 6 (Russian Federation); Polikarpov, M. I. [ITEP, 117218 Russia, Moscow, B. Cheremushkinskaya str. 25 (Russian Federation)

2011-05-01T23:59:59.000Z

375

Conductivity of Hg{sub 3}In{sub 2}Te{sub 6} crystals in high electric fields  

SciTech Connect (OSTI)

The effect of electric field and temperature on the conductivity of bulk Hg{sub 3}In{sub 2}Te{sub 6} crystals is investigated. It is shown that the I-V characteristics in high electric fields are of the S type with the effect of switching into a low-resistance state. The critical voltage of transition from the Ohm law to the exponential dependence of the current (I) on the voltage (U) and the threshold voltage of transition into the region of negative differential resistance dU/dI = s< 0 linearly depend on the sample thickness. The activation energies of conductivity in low and high electric fields are determined. It is established that the superlinear portion of the I-V characteristic with dU/dI > 0 is described by the dependence of the type I = I{sub 0} exp(U/U{sub 0}) and caused by the electron transitions from the local centers with the energy level E{sub t} = 0.19 eV.

Grushka, O. G., E-mail: semicon-dpt@chnu.edu.ua; Chupyra, S. M.; Myslyuk, O. M.; Bilichuk, S. V.; Zabolotsky, I. I. [Fedkovich Chernovtsy National University (Ukraine)

2011-01-15T23:59:59.000Z

376

Comparison of 60-Hz electric fields and incandescent light as aversive stimuli controlling the behavior of rats  

SciTech Connect (OSTI)

Rats were exposed to two procedures which enabled them to press a lever to turn off a 90 or 100 kV/m 60-Hz electric field or, later in the study, illumination from an incandescent lamp. Under one procedure, a response turned off the stimulus for a fixed duration, after which the stimulus was turned on again. A response during the off-period restarted the fixed duration. None of the rats turned the field off reliably. Next, under an alternative procedure, pressing one lever turned the field off; pressing the other lever turned it back on; responding under those conditions differed little from that seen at 0 kV/m. Under both procedures, when illumination from an incandescent lamp served as the stimulus, each rat did turn the stimulus off, and performances varied with stimulus intensity. The results show that a 100 kV/m 60-Hz electric field is not sufficient to function as an aversive stimulus under two procedures where illumination from a lamp does function as an aversive stimulus.

Stern, S.; Laties, V.G.

1989-01-01T23:59:59.000Z

377

PWR AXIAL BURNUP PROFILE ANALYSIS  

SciTech Connect (OSTI)

The purpose of this activity is to develop a representative ''limiting'' axial burnup profile for pressurized water reactors (PWRs), which would encompass the isotopic axial variations caused by different assembly irradiation histories, and produce conservative isotopics with respect to criticality. The effect that the low burnup regions near the ends of spent fuel have on system reactivity is termed the ''end-effect''. This calculation will quantify the end-effects associated with Pressurized Water Reactor (PWR) fuel assemblies emplaced in a hypothetical 21 PWR waste package. The scope of this calculation covers an initial enrichment range of 3.0 through 5.0 wt% U-235 and a burnup range of 10 through 50 GWd/MTU. This activity supports the validation of the process for ensuring conservative generation of spent fuel isotopics with respect to criticality safety applications, and the use of burnup credit for commercial spent nuclear fuel. The intended use of these results will be in the development of PWR waste package loading curves, and applications involving burnup credit. Limitations of this evaluation are that the limiting profiles are only confirmed for use with the B&W 15 x 15 fuel assembly design. However, this assembly design is considered bounding of all other typical commercial PWR fuel assembly designs. This calculation is subject to the Quality Assurance Requirements and Description (QARD) because this activity supports investigations of items or barriers on the Q-list (YMP 2001).

J.M. Acaglione

2003-09-17T23:59:59.000Z

378

Hydrodynamic Model with Binary Particle Diameters to Predict Axial Voidage Profile in a CFB Combustor  

Science Journals Connector (OSTI)

A hydrodynamic model with binary particle diameters was developed to better predict axial voidage profile in a CFB combustor. In the model, the CFB is regarded as a superposition of two ... field data of voidage ...

J. J. Li; H. Zhang; H. R. Yang; Y. X. Wu…

2010-01-01T23:59:59.000Z

379

Deformation of metallic liquid drop by electric field for contacts in molecular–organic electronics  

Science Journals Connector (OSTI)

...alternative controlled method applicable for a...Forrest 2004) and photovoltaic cells have attracted...EF-assisted alloy printing method, which enables...alternative controlled method applicable for a...Baret2005Electrowetting: from basics to applications...film floatation: principles and electrical effects...

2009-01-01T23:59:59.000Z

380

Electrical insulation system for the shell-vacuum vessel and poloidal field gap in the ZTH machine  

SciTech Connect (OSTI)

The electrical insulation systems for the ZTH machine have many unusual design problems. The poloidal field gap insulation must be capable of conforming to poloidal and toroidal contours, provide a 25 kV hold off, and sufficiently adhere to the epoxy back fill between the overlapping conductors. The shell-vacuum vessel system will use stretchable and flexible insulation along with protective hats, boots and sleeves. The shell-vacuum vessel system must be able to withstand a 12.5 kV pulse with provision for thermal insulation to limit the effects of the 300{degrees}C vacuum vessel during operation and bakeout. Methodology required to provide the electrical protection along with testing data and material characteristics will be presented. 7 figs.

Reass, W.A.; Ballard, E.O.

1989-01-01T23:59:59.000Z

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


381

Tunneling magnetoresistance tuned by a vertical electric field in an AA-stacked graphene bilayer with double magnetic barriers  

SciTech Connect (OSTI)

We investigate the effect of a vertical electric field on the electron tunneling and magnetoresistance in an AA-stacked graphene bilayer modulated by the double magnetic barriers with parallel or antiparallel configuration. The results show that the electronic transmission properties in the system are sensitive to the magnetic-barrier configuration and the bias voltage between the graphene layers. In particular, it is found that for the antiparallel configuration, within the low energy region, the blocking effect is more obvious compared with the case for the parallel configuration, and even there may exist a transmission spectrum gap which can be arbitrarily tuned by the field-induced interlayer bias voltage. We also demonstrate that the significant discrepancy between the conductance for both parallel and antiparallel configurations would result in a giant tunneling magnetoresistance ratio, and further the maximal magnetoresistance ratio can be strongly modified by the interlayer bias voltage. This leads to the possible realization of high-quality magnetic sensors controlled by a vertical electric field in the AA-stacked graphene bilayer.

Wang, Dali, E-mail: wangdali@mail.ahnu.edu.cn [Department of Physics and Center for Nano Science and Technology, Anhui Normal University, Wuhu 241000 (China); National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 (China); Jin, Guojun, E-mail: gjin@nju.edu.cn [National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 (China)

2013-12-21T23:59:59.000Z

382

Investigation of Pulsed Electric Field (PEF) as an Intensification Pretreatment for Solvent Lipid Extraction from Microalgae, utilizing Ethyl Acetate as a Greener Substitute to Chloroform-based Extraction  

E-Print Network [OSTI]

. Moreover, the novel utilization of Pulsed Electric Field (PEF) as a membrane permeating technique for intensification of the lipid extraction is analyzed. When compared to inherently toxic chloroform-based solvent (Bligh & Dyer method), this work...

Antezana Zbinden, Mauricio Daniel R.

2011-02-16T23:59:59.000Z

383

Testing of T-odd, P-even interactions by nonpolarized neutron transmission through a nonpolarized nuclear target placed into electric field  

E-Print Network [OSTI]

A new possibility for the study of time-reversal violation is described. It consists in measurement of nonpolarized neutron transmission through nonpolarized nuclear target placed into electric field

V. G. Baryshevsky

2003-12-01T23:59:59.000Z

384

Study of the electric field generated by the high voltage substations  

Science Journals Connector (OSTI)

The paper outlines the results of a study regarding the electromagnetic field generated by a 400 kV high voltage (HV) substation belonging to the Romanian national Power Grid Company Transelectrica SA. In the first part of the paper, a semi-analytical ... Keywords: HV substations, computation, electromagnetic field, human exposure, limits

Calin Munteanu; Vasile Topa; Marius Purcar; Laura Grindei; Adina Racasan

2010-10-01T23:59:59.000Z

385

Cold-hollow-cathode arc discharge in crossed electric and magnetic fields  

Science Journals Connector (OSTI)

A crossed-field cold-hollow-cathode arc is stable at low working gas pressures...?2–10?1 Pa, magnetic-field-and gas-dependent arcing voltages of 20–50 V, and discharge currents of 20–200 A. This is ... produced o...

P. M. Schanin; N. N. Koval; Yu. Kh. Akhmadeev; S. V. Grigoriev

2004-05-01T23:59:59.000Z

386

Effects on chickens of continuous exposure to low level electromagnetic, electric, and magnetic fields  

E-Print Network [OSTI]

for the degree of MASTER OF SCIENCE December 1972 Major Subjects Nuclear Engineering (Health Physics) EFFECTS ON CHI CKENS OF CONT INUOUS EXPOSURE TO LOW LEVEL ELECTRONAGNETIC, ELECTRIC, AND MAGNETIC 1 IELDS A Thesis by ROBERT SHERWOOD HOWELL Approved... exposure to ionizing radiation. The treated groups appear to have a significantly reduced growth rate and a slightly increased feed conversion ratio. The spleen weight in the 260 MHz {calculated average input power density of 0. 029 mW/cm ) group...

Howell, Robert Sherwood

1972-01-01T23:59:59.000Z

387

Spectral-phase interferometry for direct electric-field reconstruction applied to seeded extreme-ultraviolet free-electron lasers  

E-Print Network [OSTI]

We present a setup for complete characterization of femtosecond pulses generated by seeded free-electron lasers (FEL's) in the extreme-ultraviolet spectral region. Two delayed and spectrally shifted replicas are produced and used for spectral phase interferometry for direct electric field reconstruction (SPIDER). We show that it can be achieved by a simple arrangement of the seed laser. Temporal shape and phase obtained in FEL simulations are well retrieved by the SPIDER reconstruction, allowing to foresee the implementation of this diagnostic on existing and future sources. This will be a significant step towards an experimental investigation and control of FEL spectral phase.

Mahieu, Benoît; De Ninno, Giovanni; Dacasa, Hugo; Lozano, Magali; Rousseau, Jean-Philippe; Zeitoun, Philippe; Garzella, David; Merdji, Hamed

2015-01-01T23:59:59.000Z

388

De-bundling of single-wall carbon nanotubes induced by an electric field during arc discharge synthesis  

Science Journals Connector (OSTI)

Abstract As-prepared single-wall carbon nanotubes (SWCNTs) usually aggregate into bundles that have diameters of tens of nanometers, and these bundles are very difficult to separate by post-synthesis treatment for characterization and applications. In this study, we applied a constant electric field during the synthesis of \\{SWCNTs\\} by arc discharge method. As a result, ?98% of the SWCNT bundles obtained have diameters less than 10 nm, and more than 50% of the bundles are less than 3 nm in diameter, indicating a large population of isolated single or pairs of SWCNTs.

Yan-Li Zhang; Peng-Xiang Hou; Chang Liu; Hui-Ming Cheng

2014-01-01T23:59:59.000Z

389

Axial cylinder internal combustion engine  

SciTech Connect (OSTI)

This patent describes improvement in a barrel type internal combustion engine including an engine block having axial-positioned cylinders with reciprocating pistons arranged in a circular pattern: a drive shaft concentrically positioned within the cylinder block having an offset portion extending outside the cylinder block; a wobble spider rotatably journaled to the offset portion; connecting rods for each cylinder connecting each piston to the wobble spider. The improvement comprising: a first sleeve bearing means supporting the drive shaft in the engine block in a cantilevered manner for radial loads; a second sleeve bearing means rotatably supporting the wobble spider on the offset portion of the drive shaft for radial loads; a first roller bearing means positioned between the offset portion of the drive shaft and the wobble spider carrying thrust loadings only; a second roller bearing means carrying thrust loads only reacting to the first roller bearing located on the opposite end of the driveshaft between the shaft and the engine block.

Gonzalez, C.

1992-03-10T23:59:59.000Z

390

Magnetic field characterization of electrical appliances as point sources through in situ measurements  

SciTech Connect (OSTI)

It is shown that magnetic field exposure from a point source can be studied by characterizing the source with a magnetic dipole. A technique based on in situ measurements of amplitude and phase angle of three orthogonal components of the magnetic field at three points at different distances from the source was developed. The method to determine the center and the real and imaginary components of the dipole moment along the three aces is described. The characterization of the source allows the prediction of the field at any distance and along any direction from the source. The effects of background fields and of the source dimensions and complexity on the accuracy of the results are discussed.

Zaffanella, L.E.; Sullivan, T.P. [Enertech Consultants, Lee, MA (United States)] [Enertech Consultants, Lee, MA (United States); Visintainer, I. [CESI, Milan (Italy)] [CESI, Milan (Italy)

1997-01-01T23:59:59.000Z

391

Implantable cardioverter defibrillator and 50-Hz electric and magnetic fields exposure in the workplace  

Science Journals Connector (OSTI)

The measurements are then taken again in the worker’s presence, in the order of increasing exposure. For this second stage, the implant wearer is also equipped with a magnetic field recorder (EMDEX II, Enertech-U...

M. Souques; I. Magne; J. Lambrozo

2011-01-01T23:59:59.000Z

392

Combination of pulsed electric field processing and antimicrobial bottle for extending microbiological shelf-life of pomegranate juice  

Science Journals Connector (OSTI)

Abstract Pomegranate juice was processed using bench top (7.2 L/h flow rate, 35 kV/cm field strength, 72 µs total treatment time) and pilot scale (100 L/h flow rate, 35 kV/cm field strength, 281 µs total treatment time) continuous pulsed electric field (PEF) processing systems. The treated juice was packaged in PET bottles or PET bottles coated with potassium sorbate and sodium benzoate, and stored at 4 °C for 84 days. Samples were assessed every 7 days for total aerobic bacteria and yeast and mold. Untreated juice had less than one week of shelf-life, while untreated juices in antimicrobial bottles had 56 days. Juices treated with PEF alone had a shelf-life of 21 days (bench scale) and over 84 days (pilot scale). Juices treated with PEF and stored in antimicrobial bottles had a shelf-life over 84 days for both scale tests, which significantly extended the microbiological shelf-life of pomegranate juice. Industrial relevance Pulsed electric field (PEF), one of novel non-thermal processing technologies, has been studied intensively worldwide for the last decades. However, most of them were done at laboratory scale and few were at pilot or commercial scale. In addition, PEF processing alone may not provide enough shelf-life of juice as juice industry expects. The work in this paper shows the side-by-side comparison of PEF processing at lab and pilot scales and demonstrates that the combination of PEF with antimicrobial battle packaging significantly extended the shelf-life of juice. The use of a large scale PEF processing system and the combination of antimicrobial packaging provide juice manufacturers an innovate approach for enhancing the safety and extending the shelf-life of juice products.

Tony Z. Jin; Mingming Guo; Ruijin Yang

2014-01-01T23:59:59.000Z

393

Room-temperature optical absorption in the InAs/GaAs quantum-dot superlattice under an electric field  

SciTech Connect (OSTI)

Electroluminescence and absorption spectra of a ten-layer InAs/GaAs quantum dot (QD) superlattice built in a two-section laser with sections of equal length is experimentally studied at room temperature. The thickness of the GaAs spacer layer between InAs QD layers, determined by transmission electron microscopy, is {approx}6 nm. In contrast to tunnel-coupled QDs, QD superlattices amplify the optical polarization intensity and waveguide absorption of the TM mode in comparison with the TE mode. It is found that variations in the multimodal periodic spectrum of differential absorption of the QD superlattice structure are strongly linearly dependent on the applied electric field. Differential absorption spectra exhibit the Wannier-Stark effect in the InAs/GaAs QD superlattice, in which, in the presence of an external electric field, coupling of wave functions of miniband electron states is suppressed and a series of discrete levels called the Wannier-Stark ladder states are formed.

Sobolev, M. M., E-mail: m.sobolev@mail.ioffe.ru; Gadzhiev, I. M.; Bakshaev, I. O.; Nevedomskii, V. N.; Buyalo, M. S.; Zadiranov, Yu. M.; Portnoi, E. L. [Russian Academy of Sciences, Ioffe Physical Technical Institute (Russian Federation)

2011-08-15T23:59:59.000Z

394

Field Measurements of Heating System Efficiency in Nine Electrically-Heated Manufactured Homes.  

SciTech Connect (OSTI)

This report presents the results of field measurements of heating efficiency performed on nine manufactured homes sited in the Pacific Northwest. The testing procedure collects real-time data on heating system energy use and heating zone temperatures, allowing direct calculation of heating system efficiency.

Davis, Bob; Siegel, J.; Palmiter, L.; Baylon, D.

1996-07-01T23:59:59.000Z

395

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 99, NO. D7, PAGES 14,353-14,360, JULY 20, 1994 Microsecond-scale electric field pulses in cloud lightning  

E-Print Network [OSTI]

the microsecond-scale structure of the cloud-flash field. Recently, the University of Florida lightning research-scale electric field pulses in cloud lightning discharges Y. Villanueva, V. A. Rakov, and M. A. Uman Department with a 500-ns sampling interval, microsecond-scale pulses in different stages of cloud flashes in Florida

Florida, University of

396

PHYSICAL REVIEW A 86, 053401 (2012) Electric-field sensing near the surface microstructure of an atom chip using cold Rydberg atoms  

E-Print Network [OSTI]

of an atom chip using cold Rydberg atoms J. D. Carter, O. Cherry, and J. D. D. Martin Department of Physics fields near the heterogeneous metal-dielectric surface of an atom chip were measured using cold atoms. The atomic sensitivity to electric fields was enhanced by exciting the atoms to Rydberg states that are 108

Le Roy, Robert J.

397

Abstract This paper investigates the steady-state and the transient performances of an axial magnetic coupling by using  

E-Print Network [OSTI]

and measurements. Index Terms-- Analytical model, magnetic field, axial coupling, permanent magnets, pull-pitch ratio p Pole-pair number Torque angle Br Remanence of the permanent magnets K Torsional stiffness II tolerate shaft misalignment. As shown in Fig. 1, the studied axial magnetic coupling consists of two discs

Paris-Sud XI, Université de

398

Oil Field Electrical Energy Savings Through Energy-Efficient Motor Retrofits  

E-Print Network [OSTI]

. ____ Lobod. Mhd. 40.l... N N "' .. Motor Load % As shown in Figure I, the slip method is very inaccurate, while both Lobodovsky's method and the WEMTTC method are reasonably accurate. However, testing using the WEMTTC method is much easier than... and calculations. Figure 3 shows a block diagram of the system developed at WEMTTC to accomplish this task. To use the motor efficiency meter in the field, the clamps used to facilitate measuring the three-phase power input to the motor must be connected...

Ula, S.; Bershinsky, V.; Cain, W.

399

Axial Ge/Si nanowire heterostructure tunnel FETs  

SciTech Connect (OSTI)

The vapor-liquid-solid (VLS) growth of semiconductor nanowires allows doping and composition modulation along their axis and the realization of axial 1 D heterostructures. This provides additional flexibility in energy band-edge engineering along the transport direction which is difficult to attain by planar materials growth and processing techniques. We report here on the design, growth, fabrication, and characterization of asymmetric heterostructure tunnel field-effect transistors (HTFETs) based on 100% compositionally modulated Si/Ge axial NWs for high on-current operation and low ambipolar transport behavior. We discuss the optimization of band-offsets and Schottky barrier heights for high performance HTFETs and issues surrounding their experimental realization. Our HTFET devices with 10 nm PECVD SiN{sub x} gate dielectric resulted in a measured current drive exceeding 100 {mu}A/{mu}m (I/{pi}D) and 10{sup 5} I{sub on}/I{sub off} ratios.

Picraux, Sanuel T [Los Alamos National Laboratory; Daych, Shadi A [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

400

RPSEA 08123-10 Final Report Signature RPSEA Final Report Electrical Power Generation from Produced Water: Field  

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

RPSEA 08123-10 Final Report Signature RPSEA 08123-10 Final Report Signature RPSEA Final Report Electrical Power Generation from Produced Water: Field Demonstration for Ways to Reduce Operating Costs for Small Producers Project: 08123-10 April 30, 2012 Loy Sneary, President Robin Dahlheim, Sales Gulf Coast Green Energy 1801 7th St, Ste 230 Bay City, TX 77414 RPSEA 08123-10 Final Report Signature LEGAL NOTICE This report was prepared by Gulf Coast Green Energy as an account of work sponsored by the Research Partnership to Secure Energy for America, RPSEA. Neither RPSEA members of RPSEA, the National Energy Technology Laboratory, the U.S. Department of Energy, nor any person acting on behalf of any of the entities: MAKES ANY WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED WITH RESPECT TO

Note: This page contains sample records for the topic "axial electric field" 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

Low-spatial coherence electrically-pumped semiconductor laser for speckle-free full-field imaging  

E-Print Network [OSTI]

The spatial coherence of laser sources has limited their application to parallel imaging and projection due to coherent artifacts, such as speckle. In contrast, traditional incoherent light sources, such as thermal sources or light emitting diodes (LEDs), provide relatively low power per independent spatial mode. Here, we present a chip-scale, electrically-pumped semiconductor laser based on a novel design, demonstrating high power per mode with much lower spatial coherence than conventional laser sources. The laser resonator was fabricated with a chaotic, D-shaped cavity optimized to achieve highly multimode lasing. Lasing occurs simultaneously and independently in ~1000 modes, and hence the total emission exhibits very low spatial coherence. Speckle-free full-field imaging is demonstrated using the chaotic cavity laser as the illumination source. The power per mode of the sample illumination is several orders of magnitude higher than that of a LED or thermal light source. Such a compact, low-cost source, wh...

Redding, B; Huang, X; Lee, M L; Stone, A D; Choma, M A; Cao, H

2014-01-01T23:59:59.000Z

402

An investigation into the cumulative breakdown process of polymethylmethacrylate in quasi-uniform electric field under nanosecond pulses  

SciTech Connect (OSTI)

A group of complete images on the discharge channel developed in PMMA in quasi-uniform electric field under nanosecond pulses are observed with an on-line transmission microscope. The characteristics of the cumulative breakdown process are also generalized, which include initiating from the vicinity of the cathode, developing to the anode with a branch-like shape, and taking on a wormhole appearance when final breakdown occurs. The concluded characteristics are explained by referring to the conceptions of “low density domain” and “free radical” and considering the initial discharge channel as a virtual needle. The characteristics are helpful for designers to enhance the lifetime of insulators employed on a nanosecond time scale.

Zhao, Liang; Cang Su, Jian; Bo Zhang, Xi; Feng Pan, Ya; Min Wang, Li; Peng Fang, Jin; Sun, Xu; Lui, Rui [Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, P.O. Box 69 Branch 13, Xi'an 710024 (China)] [Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, P.O. Box 69 Branch 13, Xi'an 710024 (China)

2013-08-15T23:59:59.000Z

403

Mean-field analysis of ground state and low-lying electric dipole strength in $^{22}$C  

E-Print Network [OSTI]

Properties of neutron-rich $^{22}$C are studied using the mean-field approach with Skyrme energy density functionals. Its weak binding and large total reaction cross section, which are suggested by recent experiments, are simulated by modifying the central part of Skyrme potential. Calculating $E1$ strength distribution by using the random-phase approximation, we investigate developments of low-lying electric dipole ($E1$) strength and a contribution of core excitations of $^{20}$C. As the neutron Fermi level approaches the zero energy threshold ($\\varepsilon_F >\\sim -1$ MeV), we find that the low-lying $E1$ strength exceeds the energy-weighted cluster sum rule, which indicates an importance of the core excitations with the $1d_{5/2}$ orbit.

Tsunenori Inakura; W. Horiuchi; Y. Suzuki; T. Nakatsukasa

2014-05-30T23:59:59.000Z

404

An original method to evaluate the transport parameters and reconstruct the electric field in solid-state photodetectors  

SciTech Connect (OSTI)

A method for reconstructing the spatial profile of the electric field along the thickness of a generic bulk solid-state photodetector is proposed. Furthermore, the mobility and lifetime of both electrons and holes can be evaluated contextually. The method is based on a procedure of minimization built up from current transient profiles induced by laser pulses in a planar detector at different applied voltages. The procedure was tested in CdTe planar detectors for X- and Gamma rays. The devices were measured in a single-carrier transport configuration by impinging laser light on the sample cathode. This method could be suitable for many other devices provided that they are made of materials with sufficiently high resistivity, i.e., with a sufficiently low density of intrinsic carriers.

Santi, A.; Piacentini, G. [DiFeST, Department of Physics and Earth Sciences, University of Parma, Parco Area delle Scienze 7/A, 43124 Parma (Italy); Zanichelli, M.; Pavesi, M., E-mail: maura.pavesi@unipr.it [DiFeST, Department of Physics and Earth Sciences, University of Parma, Parco Area delle Scienze 7/A, 43124 Parma (Italy); IMEM-CNR, Institute of Materials for Electronics and Magnetism, Parco Area delle Scienze 37/A, 43124 Parma (Italy); Cola, A.; Farella, I. [IMM-CNR, Institute for Microelectronics and Microsystems, Via Monteroni, 73100 Lecce (Italy)

2014-05-12T23:59:59.000Z

405

Controlling Axial p-n Heterojunction Abruptness Through Catalyst...  

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

Axial p-n Heterojunction Abruptness Through Catalyst Alloying in Vapor-Liquid-Solid Grown Semiconductor Nanowires. Controlling Axial p-n Heterojunction Abruptness Through Catalyst...

406

Electric field assisted sputtering of Fe{sub 3}O{sub 4} thin films and reduction in anti-phase boundaries  

SciTech Connect (OSTI)

Fe{sub 3}O{sub 4} thin films have been prepared by a new approach of in-situ electric field assisted sputtering. Raman shift, {rho}(T), and M(T) measurements reveal a reduction in anti-phase boundaries (APBs), which is explained by the electric field induced surface diffusion favouring [111] oriented growth with lesser defects. Early magnetization saturation (4 kOe) and its higher value (441 emu/cm{sup 3}), low electron phonon coupling constant (0.48), sharp Verwey transition {Delta}T{sub V} = 12 K, Arrhenius law of conduction via delocalized states above T{sub V} and lower value of localization radius (1.5 nm) below T{sub V} compared to that observed in un-assisted films confirmed that the electric field assisted grown films are nearly free from anti-phase boundaries.

Kumar, Ankit; Pandya, Dinesh K.; Chaudhary, Sujeet [Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016 (India)

2012-10-01T23:59:59.000Z

407

Electric propulsion motor for marine vehicles  

SciTech Connect (OSTI)

An electric propulsion motor for marine vehicles is described comprising: a disk-shaped rotor and two coaxial disk-shaped stators, the rotor being separated from each of the stators in an axial direction by an air gap; the rotor including a plurality of permanent magnets that produce a first magnetic field; each stator comprising an armature winding that is connected to a source of electrical current to produce a second magnetic field, the first and second magnetic fields being capable of interacting to create an electromagnetic torque; means for coupling the rotor to a propeller shaft for transferring the torque from the rotor to the shaft, and means for detecting the angle of the shaft; a current control means for receiving a current control signal and for employing pulse width modulation to control the source of electrical current; the current control means including means for storing compensation information related to torque variations that are a function of shaft angle; the current control means further including means connected and responsive to the shaft angle detecting means for selecting the compensation information as a function of shaft angle and means for combining the compensation information with the current control signal to control the source of electrical current such that the torque variations that are a function of shaft angle are minimized; and wherein the means for coupling the rotor to the propeller shaft includes means within the motor for isolating the shaft from sound produced by the motor.

Dade, T.B.; Leiding, K.W.; Mongeau, P.P.; Piercey, M.S.

1993-07-20T23:59:59.000Z

408

Physiological observations validate finite element models for estimating subject-specific electric field distributions induced by transcranial magnetic stimulation of the human motor cortex  

Science Journals Connector (OSTI)

Abstract Recent evidence indicates subject-specific gyral folding patterns and white matter anisotropy uniquely shape electric fields generated by TMS. Current methods for predicting the brain regions influenced by TMS involve projecting the TMS coil position or center of gravity onto realistic head models derived from structural and functional imaging data. Similarly, spherical models have been used to estimate electric field distributions generated by TMS pulses delivered from a particular coil location and position. In the present paper we inspect differences between electric field computations estimated using the finite element method (FEM) and projection-based approaches described above. We then more specifically examined an approach for estimating cortical excitation volumes based on individualistic FEM simulations of electric fields. We evaluated this approach by performing neurophysiological recordings during MR-navigated motormapping experiments. We recorded motor evoked potentials (MEPs) in response to single pulse TMS using two different coil orientations (45° and 90° to midline) at 25 different locations (5 × 5 grid, 1 cm spacing) centered on the hotspot of the right first dorsal interosseous (FDI) muscle in left motor cortex. We observed that motor excitability maps varied within and between subjects as a function of TMS coil position and orientation. For each coil position and orientation tested, simulations of the TMS-induced electric field were computed using individualistic FEM models and compared to MEP amplitudes obtained during our motormapping experiments. We found FEM simulations of electric field strength, which take into account subject-specific gyral geometry and tissue conductivity anisotropy, significantly correlated with physiologically observed MEP amplitudes (rmax = 0.91, p = 1.8 × 10-5 rmean = 0.81, p = 0.01). These observations validate the implementation of individualistic FEM models to account for variations in gyral folding patterns and tissue conductivity anisotropy, which should help improve the targeting accuracy of TMS in the mapping or modulation of human brain circuits.

Alexander Opitz; Wynn Legon; Abby Rowlands; Warren K. Bickel; Walter Paulus; William J. Tyler

2013-01-01T23:59:59.000Z

409

Polyelectrolytes in electric fields: Measuring the dynamical effective charge and effective friction  

E-Print Network [OSTI]

We use a coarse-grained molecular dynamics model to study the electrophoretic behaviour of flexible polyelectrolyte chains. We first characterize the static properties of the model with respect to the chain length, the polyelectrolyte concentration, additional salt and the influence of an applied external field. Next we investigate the dynamic behaviour in the oligomer range and compare to data obtained by two different experimental methods, namely capillary electrophoresis and PFG-NMR. We find excellent agreement of experiments and simulations when hydrodynamic interactions are accounted for in the simulations. We then present novel estimators for the dynamical effective charge during free solution electrophoresis and compare them to static estimators. We find complete agreement between the static and the dynamic estimators. We further evaluate the scaling behaviour of the effective friction of the polyelectrolyte-counterion complex with the surrounding fluid. We identify a hydrodynamic screening length beyond which the friction during electrophoresis is linear depending on the chain length resulting in a constant mobility for long polyelectrolyte chains. Our results show a convincing agreement with experimental data and demonstrate that it is possible to model dynamic behaviour of polyelectrolytes using coarse grained models, provided they include the effects of hydrodynamical interactions.

Kai Grass; Christian Holm

2008-12-13T23:59:59.000Z

410

Experiments and analysis for an axially heterogeneous liquid-metal reactor assembly at the zero-power physics reactor  

SciTech Connect (OSTI)

Experiments in zero-power physics reactor 17 provided physics data for a full-scale axially heterogeneous 650-MW(electric) liquid-metal reactor. Measurements and analysis are reported for control rod worths, reaction rate distributions, gamma dose distributions, sodium void worths, and criticality. Agreement between measurement and calculation is generally satisfactory, but the axial heterogeneity did introduce analytical complications. Design-level calculation methods gave somewhat worse agreement with measurement than in previous homogeneous or radially heterogeneous assemblies.

Brumbach, S.B.; Collins, P.J. (Argonne National Lab., Idaho Falls, ID (USA))

1989-11-01T23:59:59.000Z

411

Calculation of direct and indirect excitons in GaAs?Ga1?xAlxAs coupled double quantum wells: The effects of in-plane magnetic fields and growth-direction electric fields  

Science Journals Connector (OSTI)

The variational procedure, in the effective-mass and parabolic-band approximations, is used in order to investigate the effects of crossed electric and magnetic fields on the exciton states in GaAs?Ga1?xAlxAs coupled double quantum wells. Calculations are performed for double quantum wells under applied magnetic fields parallel to the layers and electric fields in the growth direction. The exciton envelope wave function is obtained through a variational procedure using a hydrogenic 1s-like wave function and an expansion in a complete set of trigonometric functions for the electron and hole wave functions. We take into account intersubband mixing brought about by the Coulomb interaction of electron-hole pairs in double quantum wells and present a detailed analysis of the properties of direct and indirect exciton states in these systems. The present study clearly reveals anticrossing effects on the dispersion with applied voltage (or growth-direction electric field) of the photoluminescence peaks associated with direct and indirect excitons. Calculated results are found in good agreement with available experimental measurements on the photoluminescence peak position associated with direct and indirect excitons in GaAs-Ga1?xAlxAs double quantum wells under growth-direction applied electric fields or under applied in-plane magnetic fields.

M. de Dios-Leyva, C. A. Duque, and L. E. Oliveira

2007-08-02T23:59:59.000Z

412

Axial gap permanent-magnet machine with reluctance poles and PM element covers  

SciTech Connect (OSTI)

An electric machine (10) has a disk-shaped rotor (24) disposed in an operating space between two opposing stator assemblies (11, 12) to provide two axial air gaps (15, 16). The rotor (24) has a hub (28) and an outer ring (26) of non-magnetic material and is further provided with a plurality of permanent magnetic elements (25) for coupling flux that is induced by the magnetic field of the stator assemblies (11, 12). The permanent magnetic elements (25) are spaced apart and reluctance poles (27) are positioned in spaces between the magnetic elements (25) to couple additional flux induced by the magnetic field of the stator assemblies (11, 12). Various constructions and shapes (40-45) for the PM magnetic elements (25) are disclosed, and including PM covers (60) of ferromagnetic material for enhancing q-axis flux in the air gaps (15, 16) and for reducing harmonics where toothed stators are used. Methods of providing increased torque using the the various rotor constructions are also disclosed.

Hsu, John S [Oak Ridge, TN; McKeever, John W [Oak Ridge, TN

2009-04-07T23:59:59.000Z

413

Development of the temperature fields in an electric arc struck on a point electrode in a homogeneous gas stream  

Science Journals Connector (OSTI)

A study is made of the problem of a point electric source in a homogeneous gas stream and operating in the arc discharge regime. The development of an electric arc struck on a point cathode in a ... . The station...

A. B. Vatazhin

414

Electric field and humidity effects on adsorbed water behavior on BaTiO3 ferroelectric domains studied by scanning probe microscopy  

E-Print Network [OSTI]

Electric field and humidity effects on adsorbed water behavior on BaTiO3 ferroelectric domains 2014; published online 28 August 2014) Distribution of the adsorbed water on BaTiO3 ferroelectric, which adsorb on the material surface, cause delayed cracking and fracture of ferroelectric ceramics.15

Volinsky, Alex A.

415

Direct and indirect exciton states in GaAs-(Ga, Al)As double quantum wells under crossed electric and magnetic fields  

Science Journals Connector (OSTI)

A theoretical study of the direct and indirect exciton states in GaAs/Ga1-xAlxAs coupled double quantum wells under crossed electric and magnetic fields is presented. The setup of the system under consideration consists of an ... Keywords: 71.55.Eq, 73.20.Mf, 73.21.Fg, Diamagnetic shifts, Double quantum-wells, Magnetoexcitons

L. E. Oliveira; M. de Dios-Leyva; C. A. Duque

2008-03-01T23:59:59.000Z

416

Deconfined fractional electric charges in graphene at high magnetic fields Chang-Yu Hou,1 Claudio Chamon,1 and Christopher Mudry2  

E-Print Network [OSTI]

Deconfined fractional electric charges in graphene at high magnetic fields Chang-Yu Hou,1 Claudio The resistance at the charge neutral Dirac point was shown by Checkelsky et al. Phys. Rev. B 79, 115434 2009.43. f I. INTRODUCTION The elementary excitations in the fractional quantum Hall FQH effect carry

417

Electric field engineering using quantum-size-effect-tuned heterojunctions V. Adinolfi, Z. Ning, J. Xu, S. Masala, D. Zhitomirsky, S. M. Thon, and E. H. Sargent  

E-Print Network [OSTI]

, Ontario M5S 3G4, Canada 2 Division of Physical Sciences and Engineering, Solar and Photovoltaics junction solar cell architecture was recently reported that employs colloidal quantum dots (CQDs) on each the electric field profile within the solar cell through bandgap engineering, thereby improving carrier

418

field  

National Nuclear Security Administration (NNSA)

9%2A en Ten-Year Site Plans (TYSP) http:nnsa.energy.govaboutusouroperationsinfopsinfopstysp

field field-type-text field-field-page-name">

419

All Sky Camera, LIDAR and Electric Field Meter: auxiliary instruments for the ASTRI SST-2M prototype  

E-Print Network [OSTI]

ASTRI SST-2M is the end-to-end prototype telescope of the Italian National Institute of Astro- physics, INAF, designed to investigate the 10-100 TeV band in the framework of the Cherenkov Telescope Array, CTA. The ASTRI SST-2M telescope has been installed in Italy in September 2014, at the INAF ob- serving station located at Serra La Nave on Mount Etna. The telescope is foreseen to be completed and fully operative in spring 2015 including auxiliary instrumentation needed to support both operations and data anal- ysis. In this contribution we present the current status of a sub-set of the auxiliary instruments that are being used at the Serra La Nave site, namely an All Sky Camera, an Electric Field Meter and a Raman Lidar devoted, together with further instrumentation, to the monitoring of the atmospheric and environmental conditions. The data analysis techniques under development for these instruments could be applied at the CTA sites, where similar auxiliary instrumentation will be installed.

Leto, Giuseppe; Bellassai, Giancarlo; Bruno, Pietro; Maccarone, Maria Concetta; Martinetti, Eugenio

2015-01-01T23:59:59.000Z

420

Influence of a Weak Field of Pulsed DC Electricity on the Behavior and Incidence of Injury in Adult Steelhead and Pacific Lamprey, Final Report.  

SciTech Connect (OSTI)

Predation by pinnipeds, such as California sea lions Zalophus californianus, Pacific harbor seals Phoca vitulina, and Stellar sea lions Eumetopias jubatus on adult Pacific salmon Oncorhynchus spp in the lower Columbia River has become a serious concern for fishery managers trying to conserve and restore runs of threatened and endangered fish. As a result, Smith-Root, Incorporated (SRI; Vancouver, Washington), manufacturers of electrofishing and closely-related equipment, proposed a project to evaluate the potential of an electrical barrier to deter marine mammals and reduce the amount of predation on adult salmonids (SRI 2007). The objectives of their work were to develop, deploy, and evaluate a passive, integrated sonar and electric barrier that would selectively inhibit the upstream movements of marine mammals and reduce predation, but would not injure pinnipeds or impact anadromous fish migrations. However, before such a device could be deployed in the field, concerns by regional fishery managers about the potential effects of such a device on the migratory behavior of Pacific salmon, steelhead O. mykiss, Pacific lampreys Entoshpenus tridentata, and white sturgeon Acipenser transmontanus, needed to be addressed. In this report, we describe the results of laboratory research designed to evaluate the effects of prototype electric barriers on adult steelhead and Pacific lampreys. The effects of electricity on fish have been widely studied and include injury or death (e.g., Sharber and Carothers 1988; Dwyer et al. 2001; Snyder 2003), physiological dysfunction (e.g., Schreck et al. 1976; Mesa and Schreck 1989), and altered behavior (Mesa and Schreck 1989). Much of this work was done to investigate the effects of electrofishing on fish in the wild. Because electrofishing operations would always use more severe electrical settings than those proposed for the pinniped barrier, results from these studies are probably not relevant to the work proposed by SRI. Field electrofishing operations typically use high voltage and amperage settings and a variety of waveforms, pulse widths (PW), and pulse frequencies (PF), depending on conditions and target species. For example, when backpack electrofishing for trout in a small stream, one might use settings such as 500 V pulsed DC, a PW of 1 ms, and a PF of 60 Hz. In contrast, the electrical barrier proposed by SRI will produce electrical conditions significantly lower than those used in electrofishing, particularly for PW and PF (e.g., PW ranging from 300-1,000 {micro}s and PF from 2-3 Hz). Further, voltage gradients (in V/cm) are predicted to be lower in the electric barrier than those produced during typical electrofishing. Although the relatively weak, pulsed DC electric fields to be produced by the barrier may be effective at deterring pinnipeds, little, if anything, is known about the effects of such low intensity electrical fields on fish behavior. For this research, we evaluated the effects of weak, pulsed DC electric currents on the behavior of adult steelhead and Pacific lamprey and the incidence of injury in steelhead only. In a series of laboratory experiments, we: (1) documented the rate of passage of fish over miniature, prototype electric barriers when they were on and off; (2) determined some electric thresholds beyond which fish would not pass over the barrier; and (3) assessed the incidence and severity of injury in steelhead exposed to relatively severe electrical conditions. The results of this study should be useful for making decisions about whether to install electrical barriers in the lower Columbia River, or elsewhere, to reduce predation on upstream migrating salmonids and other fishes by marine pinnipeds.

Mesa, Matthew

2009-02-13T23:59:59.000Z

Note: This page contains sample records for the topic "axial electric field" 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

Axial nucleon form factors from lattice QCD  

SciTech Connect (OSTI)

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

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

2011-02-15T23:59:59.000Z

422

Study on reduction in electric field, charged voltage, ion current and ion density under HVDC transmission lines by parallel shield wires  

SciTech Connect (OSTI)

An important problem in the design and operation of HVDC transmission lines is to reduce electrical field effects such as ion flow electrification of objects, electric field, ion current and ion density at ground level in the vicinity of HVDC lines. Several models of shield wire were tested with the Shiobara HVDC test line. The models contain typical stranded wires that are generally used to reduce field effects at ground level, neutral conductors placed at lower parts of the DC line, and an ''earth corona model'' to cancel positive or negative ions intentionally by generating ions having opposite polarity to ions flowing into the wire. This report describes the experimental results of the effects of these shield wires and a method to predict shielding effects.

Amano, Y.; Sunaga, Y.

1989-04-01T23:59:59.000Z

423

Operational Experience with a Cryogenic Axial-Centrifugal Compressor  

E-Print Network [OSTI]

The Large Hadron Collider (LHC), presently under construction at CERN, requires large refrigeration capacity at 1.8 K. Compression of gaseous helium at cryogenic temperatures is therefore inevitable. Together with subcontractors, Linde Kryotechnik has developed a prototype machine. This unit is based on a cryogenic axial-centrifugal compressor, running on ceramic ball bearings and driven by a variable-frequency electrical motor operating at ambient temperature. Integrated in a test facility for superconducting magnets the machine has been commissioned without major problems and successfully gone through the acceptance test in autumn 1995. Subsequent steps were initiated to improve efficiency of this prototype. This paper describes operating experience gained so far and reports on measured performance prior to and after constructional modifications.

Decker, L; Löhlein, K; Purtschert, W; Ziegler, B L; Lebrun, P; Tavian, L; Brunovsky, I; Tucek, L

1998-01-01T23:59:59.000Z

424

TIP DESENSITIZATION OF AN AXIAL TURBINE ROTOR  

E-Print Network [OSTI]

flow causes total pressure loss and significantly reduces turbine stage efficiency. Tip leakage relatedCC-63 TIP DESENSITIZATION OF AN AXIAL TURBINE ROTOR USING PARTIAL SQUEALER RIMS Debashis Dey1 of full and partial-length squealer rims in a turbine stage. Full and partial-length squealer rims

Camci, Cengiz

425

Co-axial, high energy gamma generator  

DOE Patents [OSTI]

A gamma ray generator includes an ion source in a first chamber. A second chamber is configured co-axially around the first chamber at a lower second pressure. Co-axially arranged plasma apertures separate the two chambers and provide for restricted passage of ions and gas from the first to the second chamber. The second chamber is formed by a puller electrode having at least one long channel aperture to draw ions from the first chamber when the puller electrode is subject to an appropriate applied potential. A plurality of electrodes rings in the third chamber in third pressure co-axially surround the puller electrode and have at least one channel corresponding to the at least one puller electrode aperture and plasma aperture. The electrode rings increase the energy of the ions to a selected energy in stages in passing between successive pairs of the electrodes by application of an accelerating voltage to the successive pairs of accelerator electrodes. A target disposed co-axially around the plurality of electrodes receives the beam of accelerated ions, producing gamma rays.

Reijonen, Jani Petteri (Princeton, NJ); Gicquel, Frederic (Pennington, NJ)

2011-08-16T23:59:59.000Z

426

Electrical safety guidelines  

SciTech Connect (OSTI)

The Electrical Safety Guidelines prescribes the DOE safety standards for DOE field offices or facilities involved in the use of electrical energy. It has been prepared to provide a uniform set of electrical safety standards and guidance for DOE installations in order to affect a reduction or elimination of risks associated with the use of electrical energy. The objectives of these guidelines are to enhance electrical safety awareness and mitigate electrical hazards to employees, the public, and the environment.

Not Available

1993-09-01T23:59:59.000Z

427

Electric dipole two equal magnitude,  

E-Print Network [OSTI]

Electric dipole ­ two equal magnitude, opposite charged particles separated by distance d What's the electric field at point P due to the dipole? Electric Dipole #12;Approximate E field for a dipole is Define electric dipole moment, p as, The direction of p and d is from the negative to positive E field along

Bertulani, Carlos A. - Department of Physics and Astronomy, Texas A&M University

428

Mid-infrared pump-related electric-field domains in GaAs/(Al,Ga)As quantum-cascade structures for terahertz lasing without population inversion  

SciTech Connect (OSTI)

We investigate the effect of mid-infrared (MIR) pumping on the transport properties of GaAs/(Al,Ga)As terahertz (THz) quantum lasers (TQLs), which rely on quantum coherence effects of intersubband transitions. Aiming at THz lasing at elevated temperatures, we extend the concept of THz gain with and without population inversion of a single, MIR-pumped, electrically driven THz stage proposed by Waldmueller et al.[Phys. Rev. Lett. 99, 117401 (2007)] to an entire TQL. However, experiments using a CO{sub 2} as well as a free-electron laser and numerical simulations show that this resonant MIR pumping causes a negative differential conductivity (NDC) in addition to the NDC caused by sequential tunneling. Lasing of these TQLs is prevented by the formation of electric-field domains below the resonance field strength for gain of each single THz stage.

Giehler, M.; Wienold, M.; Schrottke, L.; Hey, R.; Grahn, H. T. [Paul-Drude-Institut fuer Festkoerperelektronik, Hausvogteiplatz 5-7, 10117 Berlin (Germany); Pavlov, S. G. [Deutsches Zentrum fuer Luft- und Raumfahrt, Rutherfordstr. 2, 12489 Berlin (Germany); Huebers, H.-W. [Deutsches Zentrum fuer Luft- und Raumfahrt, Rutherfordstr. 2, 12489 Berlin (Germany); Institut fuer Optik und Atomare Physik, Technische Universitaet Berlin, Hardenbergstr. 36, 10623 Berlin (Germany); Winnerl, S.; Schneider, H. [Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden (Germany)

2011-11-15T23:59:59.000Z

429

Electrical Contact Properties between the Accumulation Layer and Metal Electrodes in Ultrathin Poly(3-hexylthiophene)(P3HT) Field Effect Transistors  

Science Journals Connector (OSTI)

(13, 18) Further, effects of the charge injection barrier, gate electric field, and charge carrier mobility near the contact region on the contact resistance have been investigated. ... To gain further insight into the origin of the large contact resistance in the ultrathin film FET device, we compared how the contact and channel resistances change with P3HT film thickness under the same carrier concentration of 3.2 × 1012 cm–2, corresponding to VG – VT = 30 V. ... Emtage and O’Dwyer(35) proposed that the net injection current density, J, is proportional to mobility, ?, according to the equation, J = N exp(?e?B/kT)e?F where N is a constant, e is the elementary charge, ?B is the injection energy barrier, k is Boltzmann constant, T is temperature, and F is the electric field applied. ...

Byoungnam Park; Avishek Aiyar; Jung-il Hong; Elsa Reichmanis

2011-04-25T23:59:59.000Z

430

Current collapse imaging of Schottky gate AlGaN/GaN high electron mobility transistors by electric field-induced optical second-harmonic generation measurement  

SciTech Connect (OSTI)

Two-dimensional current collapse imaging of a Schottky gate AlGaN/GaN high electron mobility transistor device was achieved by optical electric field-induced second-harmonic generation (EFISHG) measurements. EFISHG measurements can detect the electric field produced by carriers trapped in the on-state of the device, which leads to current collapse. Immediately after (e.g., 1, 100, or 800??s) the completion of drain-stress voltage (200?V) in the off-state, the second-harmonic (SH) signals appeared within 2??m from the gate edge on the drain electrode. The SH signal intensity became weak with time, which suggests that the trapped carriers are emitted from the trap sites. The SH signal location supports the well-known virtual gate model for current collapse.

Katsuno, Takashi, E-mail: e1417@mosk.tytlabs.co.jp; Ishikawa, Tsuyoshi; Ueda, Hiroyuki; Uesugi, Tsutomu [Toyota Central R and D Laboratories Inc., Nagakute, Aichi 480-1192 (Japan); Manaka, Takaaki; Iwamoto, Mitsumasa [Department of Physical Electronics, Tokyo Institute of Technology, Meguro, Tokyo 152-8552 (Japan)

2014-06-23T23:59:59.000Z

431

Observation of a Magnetic Modulation of the Lattice Electric-Field Gradient of Fe2+ Substituted in 1T-TaS2  

Science Journals Connector (OSTI)

An unusual temperature dependence of the quadrupole splitting of Fe2+ in 1T-Fe0.1Ta0.9S2 can be understood in terms of a magnetic modulation of the lattice electric-field gradient. This modulation is produced by a strictive interaction between the local lattice environment and the continuous low-spin-high-spin transition of Fe2+. The onset of the charge-density-wave instability can also be observed.

M. Eibschütz and M. E. Lines

1977-09-12T23:59:59.000Z

432

Investigation of the Electric Field in TiO2/FTO Junctions Used in Dye-Sensitized Solar Cells by Photocurrent Transients  

Science Journals Connector (OSTI)

Investigation of the Electric Field in TiO2/FTO Junctions Used in Dye-Sensitized Solar Cells by Photocurrent Transients ... The input resistance of the scope was 50 ? (dc mode), and each transient was averaged 10 times (repetition rate, 1 Hz) to get a stabilized signal. ... The elementary charge is denoted as q, n, and p are the electron and hole densities, while the respective mobilities are given by ?n and ?p. ...

Sven Rühle; Thomas Dittrich

2005-04-22T23:59:59.000Z

433

Effect of an Electric Field on the Growth and Optoelectronic Properties of Quasi-One-Dimensional Organic Single Crystals of 1-(Phenylazo)-2-naphthol  

Science Journals Connector (OSTI)

Effect of an Electric Field on the Growth and Optoelectronic Properties of Quasi-One-Dimensional Organic Single Crystals of 1-(Phenylazo)-2-naphthol ... The elementary component of the crystal needle is believed to be the individual molecular column as indicted by the X-ray diffraction results. ... Because ?? was measured between two Pt electrodes and ?? between two ITO electrodes, the contact resistance may play a role. ...

Chong-yang Liu; Vincent Lynch; Allen J. Bard

1997-04-16T23:59:59.000Z

434

A Hypothesis for the Speed of Propagation of Light in electric and magnetic fields and the Planning of an Experiment for its Verification  

E-Print Network [OSTI]

As generally known, the speed of propagation of light in solid state bodies can be different from the speed of light in vacuum. That the mere presence of electric or magnetic fields in the vacuum can suffice to influence the speed of light, is a hypothesis under discussion, which is based on considerations of Quantumelectrodynamics. For a verification of this hypothesis, an interference-experiment might be performed, of which the planning is given in this article.

Claus W. Turtur

2007-03-29T23:59:59.000Z

435

LABORATORY V ELECTRIC CIRCUITS  

E-Print Network [OSTI]

Lab V -1 LABORATORY V ELECTRIC CIRCUITS Electrical devices are the cornerstones of our modern world understanding of them. In the previous laboratory, you studied the behavior of electric fields and their effect on the motion of electrons using a cathode ray tube (CRT). This beam of electrons is one example of an electric

Minnesota, University of

436

High-aperture binary axicons for the formation of the longitudinal electric field component on the optical axis for linear and circular polarizations of the illuminating beam  

SciTech Connect (OSTI)

Diffraction of uniformly polarized laser beams with vortex phase singularity is theoretically analyzed using the plane wave expansion. It is shown that for a high numerical aperture, an intense longitudinal electric field component is formed on the optical axis in this case. It is numerically demonstrated that an analogous effect is ensured for diffraction of a conventional Gaussian beam from asymmetric binary axicons. The field intensity on the optical axis can be varied either by rotating the optical element or by changing the direction of polarization of radiation.

Khonina, S. N., E-mail: khonina@smr.ru; Savelyev, D. A., E-mail: dmitrey.savelyev@yandex.ru [Russian Academy of Sciences, Institute for Image Processing Systems (Russian Federation)

2013-10-15T23:59:59.000Z

437

Promoting a level playing field for energy options: electricity alternatives and the case of the Indian Point Energy Center  

Science Journals Connector (OSTI)

The Indian Point Energy Center, with two operational nuclear reactors ... the 2,000 MW of power provided by Indian Point. This paper assesses the potential for electricity alternatives in the Indian Point service...

Marilyn A. Brown; Benjamin K. Sovacool

2008-02-01T23:59:59.000Z

438

Close electric fields and lightning-induced voltages predicted by a return-stroke model including corona and nonlinear channel resistance  

Science Journals Connector (OSTI)

Abstract In this paper, a return-stroke model based on nonuniform transmission line theory that includes nonlinear losses and corona is used for calculating close electric fields and lightning-induced voltages on an overhead line. A study is performed to identify the influence of return-stroke corona on close electric fields and line overvoltages considering different model assumptions. It is shown that the consideration of corona affects the attenuation and distortion of the return-stroke current. Close vertical electric fields predicted by the model present waveforms, peak values, and decay with distance that are in agreement with measured data. A simpler case in which the return-stroke speed is artificially set to a prescribed value by controlling the inductance and capacitance of the channel is shown to lead to results that are in agreement with the complete return-stroke model considering nonlinear losses and corona. Similar conclusions apply to popular engineering return-stroke models typically used in lightning-induced voltage calculations provided the return-stroke speed is suitably adjusted. It is also shown that lightning-induced voltages calculated with the considered model are in good agreement with experimental data.

Alberto De Conti; Fernando H. Silveira; Silvério Visacro

2014-01-01T23:59:59.000Z

439

Piping inspection carriage having axially displaceable sensor  

DOE Patents [OSTI]

A pipe inspection instrument carriage for use with a pipe crawler for performing internal inspections of piping surfaces. The carriage has a front leg assembly, a rear leg assembly and a central support connecting the two assemblies and for mounting an instrument arm having inspection instruments. The instrument arm has a y-arm mounted distally thereon for axially aligning the inspection instrumentation and a mounting block, a linear actuator and axial movement arm for extending the inspection instruments radially outward to operably position the inspection instruments on the piping interior. Also, the carriage has a rotation motor and gear assembly for rotating the central support and the front leg assembly with respect to the rear leg assembly so that the inspection instruments azimuthally scan the piping interior. The instrument carriage allows performance of all piping inspection operations with a minimum of moving parts, thus decreasing the likelihood of performance failure.

Zollinger, William T. (Martinez, GA); Treanor, Richard C. (Augusta, GA)

1994-01-01T23:59:59.000Z

440

Numerical investigation of flow structure and mixed convection heat transfer of impinging radial and axial jets  

SciTech Connect (OSTI)

Mixed convection flow fields and heat transfer of partially enclosed axial and radial laminar jets impinging on a heated flat plate have been investigated from the numerical solution of incompressible unsteady Navier-Stokes and energy equations with a Boussinesq approximation. For mixed convection flow at Re = 200, steady flow has not been observed for either the radial or the axial jet. For the smallest Grashof number (Gr = 10,000), periodic solutions have been obtained. With Gr = 40,000 nonsteady nonperiodic (chaotic) flow appears. Free convection may increase that heat transfer by more than 200%.

Potthast, F.; Laschefski, H.; Mitra, N.K. (Ruhr-Univ. Bochum (Germany). Inst. fuer Thermo- und Fluiddynamik); Biswas, G. (Indian Inst. of Tech., Kanpur (India). Dept. of Mechanical Engineering)

1994-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "axial electric field" 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

Competition between modes with different axial structures in gyrotrons  

SciTech Connect (OSTI)

This study was motivated by some experiments in which it was found that during the voltage rise, instead of expected excitation of a high-frequency parasitic mode, the excitation of a lower-frequency parasitic mode takes place in a certain range of voltages. For explaining this fact, the dependence of start currents of possible competing modes on the beam voltage was carried out in the cold-cavity approximation and by using the self-consistent approach. It was found that in the case of cavities, which consist of the combination of a section of constant radius waveguide and a slightly uptapered waveguide, these two approaches yield completely different results. Thus, experimentally observed excitation of the low-frequency parasitic mode can be explained by the self-consistent modification of the axial profile of the excited field, which has strong influence on the diffractive quality factor of competing modes. This modification is especially pronounced in the case of excitation of modes with many axial variations which can be excited in the region of beam interaction with the backward-wave component of such modes.

Khutoryan, Eduard M. [O. Ya. Usikov Institute for Radiophysics and Electronics, 12, Proskura str., Kharkiv 61085 (Ukraine); Nusinovich, Gregory S.; Sinitsyn, Oleksandr V. [Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742-3511 (United States)

2014-09-15T23:59:59.000Z

442

On geometry influence on the behavior of a quantum mechanical scalar particle with intrinsic structure in external magnetic and electric fields  

E-Print Network [OSTI]

Relativistic theory of the Cox's scalar not point-like particle with intrinsic structure is developed on the background of arbitrary curved space-time. It is shown that in the most general form, the extended Proca-like tensor first order system of equations contains non minimal interaction terms through electromagnetic tensor F_{\\alpha \\beta} and Ricci tensor R_{\\alpha \\beta}. In relativistic Cox's theory, the limiting procedure to non-relativistic approximation is performed in a special class of curved space-time models. This theory is specified in simple geometrical backgrounds: Euclid's, Lobachevsky's, and Rie\\-mann's. Wave equation for the Cox's particle is solved exactly in presence of external uniform magnetic and electric fields in the case of Minkowski space. Non-trivial additional structure of the particle modifies the frequency of a quantum oscillator arising effectively in presence if external magnetic field. Extension of these problems to the case of the hyperbolic Lobachevsky space is examined. In presence of the magnetic field, the quantum problem in radial variable has been solved exactly; the quantum motion in z-direction is described by 1-dimensional Schr\\"{o}dinger-like equation in an effective potential which turns out to be too difficult for analytical treatment. In the presence of electric field, the situation is similar. The same analysis has been performed for spherical Riemann space model.

O. V. Veko; K. V. Kazmerchuk; E. M. Ovsiyuk; V. V. Kisel; V. M. Red'kov

2014-11-07T23:59:59.000Z

443

Self-consistent particle modeling of radio frequency discharge in Ar/O{sub 2} mixtures: Effects of crossed electric and magnetic fields and partial pressure  

SciTech Connect (OSTI)

A particle-in-cell/Monte Carlo model is developed to study and analyze the electrical characteristics of the nonequilibrium plasma created by radio frequency (RF) discharge in Ar/O{sub 2} mixtures in the presence of crossed electric and magnetic fields. The method of collision treatment is based on an optimized estimation of the free time flight. The needed basic data--more specifically, the ion-neutral cross sections--are determined first. The simulation conditions are 50 mTorr for the total gas pressure and 200 V for the peak of the RF voltage at a frequency of 13.56 MHz. The magnetic field is varied from 0 to 50 G. The effect of the partial pressure ratio of O{sub 2} in the mixture and the effect of the magnitude of the magnetic field are discussed. In particular, the results show an increase of the plasma density that is ten times higher in the presence of a magnetic field.

Benyoucef, Djilali [University of Toulouse, UMR CNRS 5213, Laplace, Toulouse (France); Laboratoire Genie Electrique et Energie Renouvelables, Chlef University (Algeria); Yousfi, Mohammed [University of Toulouse, UMR CNRS 5213, Laplace, Toulouse (France); Belmadani, Bachir [Laboratoire Genie Electrique et Energie Renouvelables, Chlef University (Algeria)

2011-04-15T23:59:59.000Z

444

Electric-field-tunable defect mode in one-dimensional photonic crystal operating in the terahertz range  

E-Print Network [OSTI]

a relative tunability of 6.5% at 105K under an electric bias of 60 kV/cm. VC 2013 AIP Publishing LLC. [http usually results in a narrow transmission spectral line in the forbidden band, which is called a defect

KuÂ?el, Petr

445

Hamilton's equations for a fluid membrane: axial symmetry  

E-Print Network [OSTI]

Consider a homogenous fluid membrane, or vesicle, described by the Helfrich-Canham energy, quadratic in the mean curvature. When the membrane is axially symmetric, this energy can be viewed as an `action' describing the motion of a particle; the contours of equilibrium geometries are identified with particle trajectories. A novel Hamiltonian formulation of the problem is presented which exhibits the following two features: {\\it (i)} the second derivatives appearing in the action through the mean curvature are accommodated in a natural phase space; {\\it (ii)} the intrinsic freedom associated with the choice of evolution parameter along the contour is preserved. As a result, the phase space involves momenta conjugate not only to the particle position but also to its velocity, and there are constraints on the phase space variables. This formulation provides the groundwork for a field theoretical generalization to arbitrary configurations, with the particle replaced by a loop in space.

Riccardo Capovilla; Jemal Guven; Efrain Rojas

2005-05-25T23:59:59.000Z

446

Room-Temperature Operation of DC Axially Discharged Fast Axial-Flow CO Laser  

Science Journals Connector (OSTI)

A compact CO laser with a DC axially discharged fast-axial flow has been operated at room temperature (270 – 300 K), achieving ~ 165 W per unit discharge length in CW mode under xenon (Xe) gas addition. A maximum power of 385 W per unit gain length (1 m) has been similarly achieved with Xe gas at 235 – 275 K. Dependence of output power on gas-flow velocity v , discharge current I dis, and gas composition is examined experimentally and theoretically explained, and dependence of oscillation lines on v is also investigated. Moreover, the effect of gas-flow velocity on gas temperature is also examined.

Yutaka Kodama; Heihachi Sato

1996-01-01T23:59:59.000Z

447

Electric Currents Electric Current  

E-Print Network [OSTI]

coefficient of resistivity Electric Power: = = = Also, = . So, = = 2 = 2 Unit of Power(P): Watt (WChapter 18 Electric Currents #12;Electric Current: Flow of electric charge Current is flow of positive charge. In reality it's the electron moves in solids- Electron current. #12;Ohm's Law : Resistance

Yu, Jaehoon

448

Baroclinic tides in an axially symmetric basin  

E-Print Network [OSTI]

Energetics Returning to the governing equations (66) through (6&7) and multiplving (66) by phu?, (66) by phv?, and (67) by php?gives the result; phu?? f v?~ ? ~ ~ p S? m=O 0(, = phu?g h?o, c3 T f&hv?g o'j r SH (96) (96) aud ap? 1 a I au? I ~ ah.... Rowe (Head of Department) December 1989 ABSTRACT Baroclinic Tides in an Axially Symmetric Basin. (December 1989) Edward Paul Dever. B. S. , Texas Ag-XI University Chair ol' Advisory Committee: Prof. Robert 0. Reid A. coupled normal mode model...

Dever, Edward Paul

2012-06-07T23:59:59.000Z

449

Axial Tomography from Digitized Real Time Radiography  

DOE R&D Accomplishments [OSTI]

Axial tomography from digitized real time radiographs provides a useful tool for industrial radiography and tomography. The components of this system are: x-ray source, image intensifier, video camera, video line extractor and digitizer, data storage and reconstruction computers. With this system it is possible to view a two dimensional x-ray image in real time at each angle of rotation and select the tomography plane of interest by choosing which video line to digitize. The digitization of a video line requires less than a second making data acquisition relatively short. Further improvements on this system are planned and initial results are reported.

Zolnay, A. S.; McDonald, W. M.; Doupont, P. A.; McKinney, R. L.; Lee, M. M.

1985-01-18T23:59:59.000Z

450

Effects of growth-direction electric and magnetic fields on excitons in GaAs-Ga1?xAlxAs coupled double quantum wells  

Science Journals Connector (OSTI)

Direct and indirect excitons in GaAs-Ga1?xAlxAs coupled double quantum wells, under growth-direction applied electric and magnetic fields, have been theoretically investigated within a variational procedure in the effective-mass and parabolic-band approximations. The exciton hydrogenic 1s-like envelope wave function is obtained through a variational procedure and an appropriate expansion in trigonometric functions of the electron and hole wave functions. The applied electric field produces a polarization of the exciton by pushing the electron and hole away from each other, whereas the magnetic field contracts the exciton by pushing the electron and hole closer to each other. Intersubband mixing produced by the Coulomb interaction of electron-hole pairs is taken into account and a detailed analysis of the properties of direct- and indirect-exciton states in GaAs-Ga1?xAlxAs coupled double quantum wells is presented, with theoretical results in good agreement with available experimental measurements.

A. L. Morales, N. Raigoza, C. A. Duque, and L. E. Oliveira

2008-03-17T23:59:59.000Z

451

Resistance of a perovskite manganite junction limited by series resistance after an electric-field-induced insulator-to-metal transition  

Science Journals Connector (OSTI)

We observed the electric-field-induced insulator-to-metal (IM) transition in YBa2Cu3O7???Pr1?xCaxMnO3 (PCMO,x=0.5)?SrRuO3 ramp-type junctions with a small area of ?6?m2 using an external series resistor from 150?to2M?. As a result, it was revealed that the resistance of the junctions immediately after the transition was on a comparable order to the external series resistance. Therefore, the smaller the external series resistance is, the smaller the resistance of the PCMO film immediately after the IM transition will be. The parasitic resistance in the junction works as a series resistance to the PCMO film. We achieved the minimum resistivity of ?10?1?cm by reducing the parasitic resistance in the junctions without an external series resistor. The present results indicate that the intrinsic resistivity, as realized in the magnetic-field- and x-ray- and photon-irradiation-induced IM transitions, can also be achieved in the electric-field-induced IM transition if we succeed in sufficiently diminishing the parasitic resistance.

Tatsuya Murakami, Joe Sakai, and Syozo Imai

2007-02-27T23:59:59.000Z

452

Electric field induced alignment-orientation conversion in diatomic molecules: analysis and observation for NaK  

E-Print Network [OSTI]

rules may be broken, thus leading to align- ment-orientation conversion (AOC) see [1] and refer- ences field strength takes place. The appearance of magnetic field induced AOC in diatomic molecules was observed earlier [2], while Stark effect induced AOC was considered only theo- retically [1,3]. In present

Auzinsh, Marcis

453

VOLUME 78, NUMBER 5 P H Y S I C A L R E V I E W L E T T E R S 3 FEBRUARY 1997 Steady-State Confinement of Non-neutral Plasmas by Rotating Electric Fields  

E-Print Network [OSTI]

]. This process is analogous to an in- duction motor, since the applied electric field both creates and couples-State Confinement of Non-neutral Plasmas by Rotating Electric Fields X.-P. Huang,* F. Anderegg, E. M. Hollmann, C. F "rotating wall" electric fields to spin up a non-neutral plasma in a Penning-Malmberg trap, resulting

California at San Diego, University of

454

Supporting Information Electric Field Reversal of Na2SO4, (NH4)2SO4, and Na2CO3 relative to CaCl2  

E-Print Network [OSTI]

water 1 M Na2 CO3 1 M Na2 SO4 1 M (NH4 )2 SO4 2 M CaCl2 2 M NaCl Re (2) (a.u.) Incident Infrared (cm -1.8 M CaCl2, 1.8 M NaCl, 1.1 M Na2CO3, 1.1 M Na2SO4, and 1.1 M (NH4)2SO4 salt solutions. ExperimentalS1 Supporting Information Electric Field Reversal of Na2SO4, (NH4)2SO4, and Na2CO3 relative to CaCl

455

Electric field Induced Patterns in Soft Visco-elastic films: From Long Waves of Viscous Liquids to Short Waves of Elastic Solids  

E-Print Network [OSTI]

We show that the electric field driven surface instability of visco-elastic films has two distinct regimes: (1) The visco-elastic films behaving like a liquid display long wavelengths governed by applied voltage and surface tension, independent of its elastic storage and viscous loss moduli, and (2) the films behaving like a solid require a threshold voltage for the instability whose wavelength always scales as ~ 4 x film thickness, independent of its surface tension, applied voltage, loss and storage moduli. Wavelength in a narrow transition zone between these regimes depends on the storage modulus.

N. Arun; Ashutosh Sharma; Partho S. G. Pattader; Indrani Banerjee; Hemant M. Dixit; K. S. Narayan

2009-06-02T23:59:59.000Z

456

Physics II Exam 2 -Chs. 18A,19,20 -Electric Current, Magnetic Field Feb. 23, 2009 Name Rec. Instr. Rec. Time  

E-Print Network [OSTI]

Physics II Exam 2 - Chs. 18A,19,20 - Electric Current, Magnetic Field Feb. 23, 2009 Name Rec. Instr·m/A, elementary charge e = 1.602�10-19 C, electron mass me = 9.11�10-31 kg, 1 electron-volt = 1.0 eV = 1. (aluminum resistivity is = 2.65�10-8 ·m). a) (4) What resistance should a 1.00 meter length of the wire

Wysin, Gary

457

Reduction of Ion Thermal Diffusivity Associated with the Transition of the Radial Electric Field in Neutral-Beam-Heated Plasmas in the Large Helical Device  

Science Journals Connector (OSTI)

Recent large helical device experiments revealed that the transition from ion root to electron root occurred for the first time in neutral-beam-heated discharges, where no nonthermal electrons exist. The measured values of the radial electric field were found to be in qualitative agreement with those estimated by neoclassical theory. A clear reduction of ion thermal diffusivity was observed after the mode transition from ion root to electron root as predicted by neoclassical theory when the neoclassical ion loss is more dominant than the anomalous ion loss.

K. Ida et al.

2001-06-04T23:59:59.000Z

458

OpenEI - Electricity Consumption  

Open Energy Info (EERE)

Annual Electricity Annual Electricity Consumption (1980 - 2009) http://en.openei.org/datasets/node/877 Total annual electricity consumption by country, 1980 to 2009 (billion kilowatthours). Compiled by Energy Information Administration (EIA). License

field field-type-text field-field-license-type">
field-label">Type of License:  Other (please specify below)
Source of data
field

459

Electric-Magnetic Duality in Massless QED?  

E-Print Network [OSTI]

The possibility that QED and recently developed non-Hermitian, or magnetic, versions of QED are equivalent is considered. Under this duality the Hamiltonians and anomalous axial currents of the two theories are identified. A consequence of such a duality is that particles described by QED carry magnetic as well as electric charges. The proposal requires a vanishing zero bare fermion mass in both theories; Dirac mass terms are incompatible with the conservation of magnetic charge much as Majorana masses spoil the conservation of electric charge. The physical spectrum comprises photons and massless spin-1/2 particles carrying equal or opposite electric and magnetic charges. The four particle states described by the Dirac fermion correspond to the four possible charge assignments of elementary dyons. This scale invariant spectrum indicates that the quantum field theory is finite. The Johnson Baker Willey eigenvalue equation for the fine structure constant in finite spinor QED is interpreted as a Dirac-like charge quantisation condition for dyons.

Chris Ford

2009-09-09T23:59:59.000Z

460

Xenon-induced axial power oscillations in the 400 MW PBMR  

Science Journals Connector (OSTI)

The redistribution of the spatial xenon concentration in the 400 MW Pebble Bed Modular Reactor (PBMR) core has a non-linear, time-dependent feedback effect on the spatial power density during several types of operational transient events. Due to the inherent weak coupling that exists between the iodine and xenon formation and destruction rates, as well as the complicating effect of spatial variance in the thermal flux field, reactor cores have been analyzed for a number of decades for the occurrence and severity of xenon-induced axial power oscillations. Of specific importance is the degree of oscillation damping exhibited by the core during transients, which involves axial variations in the local power density. In this paper the TINTE reactor dynamics code is used to assess the stability of the current 400 MW PBMR core design with regard to axial xenon oscillations. The focus is mainly on the determination of the inherent xenon and power oscillation damping properties by utilizing a set of hypothetical control rod insertion transients at various power levels. The oscillation damping properties of two 100%–50%–100% load-follow transients, one of which includes the de-stabilizing axial effects of moving control rods, are also discussed in some detail. The study shows that, although first axial mode oscillations do occur in the 400 MW PBMR core, the inherent damping of these oscillations is high, and that none of the investigated load-follow transients resulted in diverging oscillations. It is also shown that the PBMR core exhibits no radial oscillation components for these xenon-induced axial power oscillations.

Gerhard Strydom

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "axial electric field" 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

Interaction of carbon dioxide laser radiation with a nanotube array in the presence of a constant electric field  

SciTech Connect (OSTI)

The dependence of the current density on the leading edge width of the alternating (high-frequency) field amplitude is studied at various constant (or unsteady) fields. The dependence of amplified microwaves in the two-millimeter range on a longitudinal coordinate is determined. The problem of submillimeter radiation generation in a system of parallel carbon nanotubes exposed to two-frequency carbon dioxide (CO{sub 2} laser) laser radiation in the presence of a constant (or unsteady) field is studied. The possibility of using freely oriented carbon nanotubes parallel to each other is shown.

Sadykov, N. R., E-mail: n.r.sadykov@rambler.ru [Branch of South Ural State University (Russian Federation); Scorkin, N. A. [Snezhinsk Physics and Technology Institute of the National Research Nuclear University 'MEPhI' (Russian Federation)

2012-06-15T23:59:59.000Z

462

Edge radial electric field studies via charge exchange recombination spectroscopy on the Alcator C-Mod Tokamak  

E-Print Network [OSTI]

It is commonly accepted that ExB velocity shear is responsible for the suppression of edge turbulence, which reduces the losses of both energy and particles across magnetic field lines and results in the formation of edge ...

McDermott, Rachael Marie

2009-01-01T23:59:59.000Z

463

A new method of measuring the poloidal magnetic and radial electric fields in a tokamak using a laser-accelerated ion-beam trace probe  

SciTech Connect (OSTI)

Both the poloidal magnetic field (B{sub p}) and radial electric field (E{sub r}) are significant in magnetic confinement devices. In this paper, a new method was proposed to diagnose both B{sub p} and E{sub r} at the same time, which was named Laser-accelerated Ion-beam Trace Probe (LITP). This method based on the laser-accelerated ion beam, which has three properties: large energy spread, short pulse lengths, and multiple charge states. LITP can provide the 1D profiles, or 2D images of both B{sub p} and E{sub r}. In this paper, we present the basic principle and some preliminary theoretical results.

Yang, X. Y.; Chen, Y. H.; Lin, C.; Wang, X. G.; Xiao, C. J., E-mail: cjxiao@pku.edu.cn [State Key Labaratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871 (China); Wang, L. [Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190 (China); Xu, M. [Center for Fusion Science of Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041 (China)

2014-11-15T23:59:59.000Z

464

Analysis of carrier behavior in C60/P(VDF-TrFE) double-layer capacitor by using electric-field-induced optical second-harmonic generation measurement  

SciTech Connect (OSTI)

By using displacement current measurement (DCM) and electric-field-induced optical second-harmonic generation (EFISHG) measurement, we studied the carrier behavior in the indium-tin oxide (ITO)/Poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE))/C60/Au(or Al) capacitors. Two DCM peaks appeared asymmetrically at around ?35.5?V and +30.0?V in the dark. Correspondingly, the EFISHG response from the C60 layer was observed, but the peak positions were different with respect to DCM ones. The results show that the spontaneous polarization of the ferroelectric P(VDF-TrFE) polymeric layer directly affects the electric field in the C60 layer, and thus governs the carrier motion in this layer. As a result, the C60 layer serves like an insulator in the dark, while electrons and holes are captured and released at the interface in response to the turn-over of spontaneous polarization of ferroelectric layer. On the other hand, under white light illumination, C60 layer serves like a conductor due to the increase of photogenerated mobile carriers, and these carriers dominate the carrier motions therein. Our findings here will be helpful for analyzing carrier behaviors in organic electronic devices using ferroelectric polymers.

Cui, Xiaojin [Department of Physical Electronics, Tokyo Institute of Technology 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552 (Japan); State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China); Taguchi, Dai; Manaka, Takaaki; Iwamoto, Mitsumasa, E-mail: iwamoto@pe.titech.ac.jp [Department of Physical Electronics, Tokyo Institute of Technology 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552 (Japan)

2013-12-21T23:59:59.000Z

465

Multistage axial-flux PM machine for wheel direct drive  

SciTech Connect (OSTI)

The design of direct-drive wheel motors must comply with diameter restriction due to housing the motor in a wheel rim and allow the achievement of very high torque density and overload capability. Slotless axial-flux permanent magnet machines (AFPMs) prove to be the best candidate for application in electric vehicles as direct-drive wheel motors, as in comparison with conventional machines they allow designs with higher compactness, lightness and efficiency. The paper presents a newly conceived AFPM which has a multistage structure and a water-cooled ironless stator. In the proposed new topology of the machine the space formerly occupied by the toroidal core becomes a water duct, which removes heat directly from the interior surface of the stator winding. The high efficiency of the machine cooling arrangement allows long-term 100% overload operation and great reduction of the machine weight. The multistage structure of the machine is suited to overcome the restriction on the machine diameter and meet the torque required at the wheel shaft. The paper gives guidelines for the design of a multistage AFPM with water-cooled ironless stator, and describes characteristics of a two-stage prototype machine rated 215 N{center_dot}m, 1,100 r/min.

Caricchi, F.; Crescimbini, F.; Mezzetti, F.; Santini, E. [Univ. of Rome La Sapienza (Italy). Dept. of Electrical Engineering] [Univ. of Rome La Sapienza (Italy). Dept. of Electrical Engineering

1996-07-01T23:59:59.000Z

466

Chapter 20: Electric Potential and Electric Potential Energy  

E-Print Network [OSTI]

1 Chapter 20: Electric Potential and Electric Potential Energy 2. A 4.5 µC charge moves in a uniform electric field ( )5 ^4.1 10 N/C= �E x . The change in electric potential energy of a charge that moves against an electric field is given by equation 20-1, 0U q Ed = . If the charge moves in the same

Kioussis, Nicholas

467

Radial electric field generated by resonant trapped electron pinch with radio frequency injection in a tokamak plasma  

E-Print Network [OSTI]

electrons in the direction parallel to the toroidal field. It was found that, for typical tokamak parameters required in ITER or future reactors. Therefore, it is of great interest to investigate methods of flow and transport was provided in sequential time scales. In addition, an inter-machine comparison of intrinsic

468

Motor cortex activation by H-coil and figure-8 coil at different depths. Combined motor threshold and electric field distribution study  

Science Journals Connector (OSTI)

AbstractObjective To compare the ability of an H-coil and figure-8 coil to stimulate different motor cortex regions. Methods The resting (rMT) and active (aMT) motor thresholds were measured for the right hand APB and leg AHB muscles in 10 subjects, using an H-coil and a figure-8 coil. The electric field distribution induced by the coils was measured in a head model. The combination of the hand and leg \\{MTs\\} with the field measurements was used to determine the depth of hand and leg motor areas via the intersection points. Results The rMT and aMT of both APB and AHB were significantly lower for the H-coil. The ratio and difference between the leg and hand rMT and aMT were significantly lower for the H-Coil. Electric field measurements revealed significantly more favorable depth profile and larger volume of stimulation for the H-coil. The averaged intersection for the APB was at a distance from coil of 1.83 ± 0.54 cm and at an intensity of 97.8 ± 21.4 V/m, while for the AHB it was at a distance of 2.73 ± 0.44 cm and at an intensity of 118.6 ± 21.3 V/m. Conclusion The results suggest a more efficient activation of deeper motor cortical regions using the H-coil. Significance The combined evaluation of \\{MTs\\} by H- and figure-8 coils allows measurement of the individual depth of different motor cortex regions. This could be helpful for optimizing stimulation parameters for TMS treatment.

Yiftach Roth; Gaby S. Pell; Andrei V. Chistyakov; Alon Sinai; Abraham Zangen; Menashe Zaaroor

2014-01-01T23:59:59.000Z

469

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

E-Print Network [OSTI]

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

Minoru Eto; Koji Hashimoto; Tetsuo Hatsuda

2012-09-21T23:59:59.000Z

470

Fixing Two-Nucleon Weak-Axial Coupling L_{1,A} From mu-d Capture  

E-Print Network [OSTI]

We calculate the muon capture rate on the deuteron to next-to-next-to-leading order in the pionless effective field theory. The result can be used to constrain the two-nucleon isovector axial coupling L_{1,A} to +/- 2 fm^3 if the muon capture rate is measured to 2% level. From this, one can determine the neutrino-deuteron break up reactions and the pp-fusion cross section in the sun to a same level of accuracy.

Jiunn-Wei Chen; Takashi Inoue; Xiangdong Ji; Yingchuan Li

2006-01-11T23:59:59.000Z

471

Effective Parameters in Axial Injection Suspension Plasma Spray Process  

E-Print Network [OSTI]

Effective Parameters in Axial Injection Suspension Plasma Spray Process of Alumina-structured coatings with metastable phases using significantly smaller particles as compared to conventional thermal, an alumina/ 8 wt.% yttria-stabilized zirconia was deposited by axial injection SPS process. The effects

Medraj, Mamoun

472

The Shaft Torque of a Tandem Axial-Piston Pump  

E-Print Network [OSTI]

The Shaft Torque of a Tandem Axial- Piston Pump Noah D. Manring Viral S. Mehta Mechanical of this study is to identify the best indexed position of two rotating groups within a tandem axial-piston pump characteristics of the pump, other vibration aspects of the machine are also expected to be reduced. In particular

Manring, Noah D.

473

DEPLOYMENT MECHANISMS ON THE FAST SATELLITE: MAGNETOMETER, RADIAL WIRE, AND AXIAL BOOMS  

E-Print Network [OSTI]

booms. Table of Contents 1. Introduction 1.1. Mission Background 1.2. Electric Field Sensor Description Electric Fields Mechanisms 3.1. The Sensors 3.2. Radial Wire Boom Deployment and Configuration 3. Introduction 1.1. MISSION BACKGROUND The scientific objective of this magnetospheric physics mission

California at Berkeley, University of

474

Mechanical constraints enhance electrical energy densities of soft dielectrics  

E-Print Network [OSTI]

Mechanical constraints enhance electrical energy densities of soft dielectrics Lin Zhang, Qiming, the dielectric will breakdown electrically. The breakdown limits the electrical energy density of the dielectric electric fields and thus increase their electrical energy densities. The mechanical constraints suppress

Ferrari, Silvia

475

Partially Conserved Axial-Vector Current Restrictions on Pion Photoproduction and Electroproduction Amplitudes  

Science Journals Connector (OSTI)

We discuss numerically the restrictions imposed by the partially conserved axial-vector current (PCAC) on the pion photoproduction amplitude V1(+)(0) and on the pion electroproduction amplitude V6(-)(0). We find that the magnetic-dipole dominance and the narrow-resonance approximations are unreliable. The nonresonant s waves make an important contribution to V1(+)(0), and we find that the PCAC prediction for this amplitude is reasonably well satisfied. The electric and longitudinal multipoles appear to make a much bigger contribution to V6(-)(0) than does the magnetic dipole M1+, which is strongly suppressed by the kinematics.

Stephen L. Adler and Frederick J. Gilman

1966-12-23T23:59:59.000Z

476

Effect of ion orbit loss on the structure in the H-mode tokamak edge pedestal profiles of rotation velocity, radial electric field, density, and temperature  

SciTech Connect (OSTI)

An investigation of the effect of ion orbit loss of thermal ions and the compensating return ion current directly on the radial ion flux flowing in the plasma, and thereby indirectly on the toroidal and poloidal rotation velocity profiles, the radial electric field, density, and temperature profiles, and the interpretation of diffusive and non-diffusive transport coefficients in the plasma edge, is described. Illustrative calculations for a high-confinement H-mode DIII-D [J. Luxon, Nucl. Fusion 42, 614 (2002)] plasma are presented and compared with experimental results. Taking into account, ion orbit loss of thermal ions and the compensating return ion current is found to have a significant effect on the structure of the radial profiles of these quantities in the edge plasma, indicating the necessity of taking ion orbit loss effects into account in interpreting or predicting these quantities.

Stacey, Weston M. [Fusion Research Center, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)] [Fusion Research Center, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)

2013-09-15T23:59:59.000Z

477

Effects of reduced voltage on the operation and efficiency of electric systems. Volume 3. Field tests in a northern utility service area. Final report  

SciTech Connect (OSTI)

Volume 3 of this three-volume report for RP1419-1 describes the tests on selected residential, commercial, and small industry areas of the Detroit Edison Company system and the statistical analysis performed on the test data gathered. The purpose of the field testing was to provide data to analyze changes in energy consumption due to changes in feeder voltage levels. Detroit Edison was chosen to represent a winter peaking load area. Original intent was to present these results simultaneously with results from a summer peaking load area, Texas Electric Service Company (TESCO). Unavoidable delays retarded the Detroit study results to this Volume 3. TESCO results were reported in Volume 1, and the Distribution System Analysis and Simulation (DSAS) program for these studies was presented in Volume 2 in the form of a User's Manual.

Chen, M.S.; Shoults, R.R.

1985-07-01T23:59:59.000Z

478

Supporting Information Surface Electric Fields of Aqueous Solutions of NH4NO3, Mg(NO3)2, NaNO3,  

E-Print Network [OSTI]

S1 Supporting Information Surface Electric Fields of Aqueous Solutions of NH4NO3, Mg(NO3)2, NaNO3 interfaces of (a) 1.0 M and 2.0 M LiNO3, (b) 1.0 M and 1.7 M NaNO3, (c) 1.0 M and 1.6 M NH4NO3, and (d) 1.0 M water 1.0 M NaNO3 1.7 M NaNO3 c water 1.0 M NH4 NO3 1.6 M NH4 NO3 | (2) | 2 (10 3 arb.units) Wavenumber

479

Definition: Electricity | Open Energy Information  

Open Energy Info (EERE)

Electricity Electricity Jump to: navigation, search Dictionary.png Electricity Energy resulting from the flow of charge particles[1][2] View on Wikipedia Wikipedia Definition Electricity is the set of physical phenomena associated with the presence and flow of electric charge. Electricity gives a wide variety of well-known effects, such as lightning, static electricity, electromagnetic induction and the flow of electrical current. In addition, electricity permits the creation and reception of electromagnetic radiation such as radio waves. In electricity, charges produce electromagnetic fields which act on other charges. Electricity occurs due to several types of physics: electric charge: a property of some subatomic particles, which determines their electromagnetic interactions. Electrically charged matter is

480

LABORATORY VI ELECTRICITY FROM MAGNETISM  

E-Print Network [OSTI]

LABORATORY VI ELECTRICITY FROM MAGNETISM Lab VI - 1 In the previous problems you explored the magnetic field and its effect on moving charges. You also saw how electric currents could create magnetic can give rise to electric currents. This is the effect that allows the generation of electricity

Minnesota, University of

Note: This page contains sample records for the topic "axial electric field" 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

OpenEI - Electricity Generation  

Open Energy Info (EERE)

Annual Electricity Annual Electricity Generation (1980 - 2009) http://en.openei.org/datasets/node/878 Total annual electricity generation by country, 1980 to 2009 (available in billion kilowatthours ). Compiled by Energy Information Administration (EIA).

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482

Effect of a high electric field on the conductivity of MnGa{sub 2}S{sub 4}, MnIn{sub 2}S{sub 4}, and MnGaInS{sub 4} single crystals  

SciTech Connect (OSTI)

The results of studying the effect of a high electric field on the conductivity of MnGa{sub 2}S{sub 4}, MnIn{sub 2}S{sub 4}, and MnGaInS{sub 4} single crystals are reported. The activation energy is determined in high and low electric fields. It is established that the decrease in the activation energy with increasing the external voltage is associated with decreasing the depth of the potential well, in which the electron is located.

Niftiev, N. N. [Azerbaijan State Pedagogical University (Azerbaijan); Tagiev, O. B. [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2009-09-15T23:59:59.000Z

483

The self-consistent parallel electric field due to electrostatic ion-cyclotron turbulence in downward auroral-current regions of the Earth's magnetosphere. IV  

SciTech Connect (OSTI)

The physical processes that determine the self-consistent electric field (E{sub ||}) parallel to the magnetic field have been an unresolved problem in magnetospheric physics for over 40 years. Recently, a new multimoment fluid theory was developed for inhomogeneous, nonuniformly magnetized plasma in the guiding-center and gyrotropic approximation that includes the effect of electrostatic, turbulent, wave-particle interactions (see Jasperse et al. [Phys. Plasmas 13, 072903 (2006); ibid.13, 112902 (2006)]). In the present paper and its companion paper [Jasperse et al., Phys. Plasmas 17, 062903 (2010)], which are intended as sequels to the earlier work, a fundamental model for downward, magnetic field-aligned (Birkeland) currents for quasisteady conditions is presented. The model includes the production of electrostatic ion-cyclotron turbulence in the long-range potential region by an electron, bump-on-tail-driven ion-cyclotron instability. Anomalous momentum transfer (anomalous resistivity) by itself is found to produce a very small contribution to E{sub ||}; however, the presence of electrostatic, ion-cyclotron turbulence has a very large effect on the altitude dependence of the entire quasisteady solution. Anomalous energy transfer (anomalous heating and cooling) modifies the density, drift, and temperature altitude profiles and hence the generalized parallel-pressure gradients and mirror forces in the electron and ion momentum-balance equations. As a result, |E{sub ||}| is enhanced by nearly a factor of 40 compared to its value when turbulence is absent. The space-averaged potential increase associated with the strong double layer at the bottom of the downward-current sheet is estimated using the FAST satellite data and the multimoment fluid theory.

Jasperse, John R.; Basu, Bamandas [Air Force Research Laboratory, Space Vehicles Directorate, Hanscom AFB, Massachusetts 01731 (United States); Lund, Eric J. [Space Science Center, University of New Hampshire, Durham, New Hampshire 03824 (United States); Grossbard, Neil [Institute for Scientific Research, Boston College, Chestnut Hill, Massachusetts 02467 (United States)

2010-06-15T23:59:59.000Z

484

E-Print Network 3.0 - axially symmetric solutions Sample Search...  

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

and Rayleigh numbers close to onset of convection. Axial dipole solutions are subcritical in all... - ble the Rayleigh number the solution switches to an axial dipole...

485

E-Print Network 3.0 - axial kinetic energy Sample Search Results  

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

axial flow fan systems. Despite... -vortex-driven flow structures to increase the energy efficiency of axial flow fan systems to provide high quality... the mean kinetic...

486

Applications of axial and radial compressor dynamic system modeling  

E-Print Network [OSTI]

The presented work is a compilation of four different projects related to axial and centrifugal compression systems. The projects are related by the underlying dynamic system modeling approach that is common in all of them. ...

Spakovszky, Zoltán S. (Zoltán Sándor), 1972-

2001-01-01T23:59:59.000Z

487

Investigation of valve plate in water hydraulic axial piston motor  

Science Journals Connector (OSTI)

This paper has introduced the developments of water hydraulic axial piston equipments. According to the effects of physico-chemical properties of water on water hydraulic components, a novel valve plate for water

Song-Lin Nie Ph.D; Zhuang-Yun Li…

2002-03-01T23:59:59.000Z

488

Lateral and Axial Capacity of Monopiles for Offshore Wind Turbines  

Science Journals Connector (OSTI)

Offshore wind has enormous worldwide potential to generate increasing ... are considered to be viable in supporting larger offshore wind turbines in shallow to medium depth waters. In ... of axial and lateral loa...

Aliasger Haiderali; Ulas Cilingir; Gopal Madabhushi

2013-09-01T23:59:59.000Z

489

Thermoacoustic magnetohydrodynamic electrical generator  

DOE Patents [OSTI]

A thermoacoustic magnetohydrodynamic electrical generator includes an intrinsically irreversible thermoacoustic heat engine coupled to a magnetohydrodynamic electrical generator. The heat engine includes an electrically conductive liquid metal as the working fluid and includes two heat exchange and thermoacoustic structure assemblies which drive the liquid in a push-pull arrangement to cause the liquid metal to oscillate at a resonant acoustic frequency on the order of 1,000 Hz. The engine is positioned in the field of a magnet and is oriented such that the liquid metal oscillates in a direction orthogonal to the field of the magnet, whereby an alternating electrical potential is generated in the liquid metal. Low-loss, low-inductance electrical conductors electrically connected to opposite sides of the liquid metal conduct an output signal to a transformer adapted to convert the low-voltage, high-current output signal to a more usable higher voltage, lower current signal.

Wheatley, John C. (Los Alamos, NM); Swift, Gregory W. (Los Alamos, NM); Migliori, Albert (Santa Fe, NM)

1986-01-01T23:59:59.000Z

490

Design and testing of an electron cyclotron resonance heating ion source for use in high field compact superconducting cyclotrons  

E-Print Network [OSTI]

The main goal of this project is to evaluate the feasibility of axial injection of a high brightness beam from an Electron Cyclotron Resonance ion source into a high magnetic field cyclotron. Axial injection from an ion ...

Artz, Mark E

2012-01-01T23:59:59.000Z

491

Electricity and Magnetism Review Notes by L. Qian1  

E-Print Network [OSTI]

) --------------------------------------------------- ------------------------------------------------- Electric Field Lines: Magnetic Field Lines: - Start from positive charges or - External field lines start) --------------------------------------------------- ------------------------------------------------- Electric Field: Magnetic Field: Symbol: E r Symbol: B r Unit: V/m = N/C Unit: T = Ns /(Cm) [T: Tesla] - Electric field due to a static charge q - Magnetic field due to a current element sdi r r r q E ^ 4 1 2 0 r

Qian, Li

492

Torsional Alfven Waves in Solar Magnetic Flux Tubes of Axial Symmetry  

E-Print Network [OSTI]

Aims: Propagation and energy transfer of torsional Alfv\\'en waves in solar magnetic flux tubes of axial symmetry is studied. Methods: An analytical model of a solar magnetic flux tube of axial symmetry is developed by specifying a magnetic flux and deriving general analytical formulae for the equilibrium mass density and a gas pressure. The main advantage of this model is that it can be easily adopted to any axisymmetric magnetic structure. The model is used to simulate numerically the propagation of nonlinear Alfv\\'en waves in such 2D flux tubes of axial symmetry embedded in the solar atmosphere. The waves are excited by a localized pulse in the azimuthal component of velocity and launched at the top of the solar photosphere, and they propagate through the solar chromosphere, transition region, and into the solar corona. Results: The results of our numerical simulations reveal a complex scenario of twisted magnetic field lines and flows associated with torsional Alfv\\'en waves as well as energy transfer to t...

Murawski, K; Musielak, Z E; Srivastava, A K; Kraskiewicz, J

2015-01-01T23:59:59.000Z

493

SEEING AND COMMUNICATING THROUGH WEAK ELECTRIC  

E-Print Network [OSTI]

Inside JEB i SEEING AND COMMUNICATING THROUGH WEAK ELECTRIC FIELDS Weakly electric fish spend their lives bathed in their own internally generated mild electric field, interpreting perturbations frequency electric `chirps'. Rüdiger Krahe, from McGill University, Canada, says, `These fish are very

494

E-Print Network 3.0 - axial flow turbines Sample Search Results  

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

turbines Search Powered by Explorit Topic List Advanced Search Sample search results for: axial flow turbines...

495

E-Print Network 3.0 - axial flow turbine Sample Search Results  

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

turbine Search Powered by Explorit Topic List Advanced Search Sample search results for: axial flow turbine...

496

E-Print Network 3.0 - axial piston pumps Sample Search Results  

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

pumps Search Powered by Explorit Topic List Advanced Search Sample search results for: axial piston pumps...

497

Effects of crossed electric and magnetic fields on the electronic and excitonic states in bulk GaAs and GaAs?Ga1?xAlxAs quantum wells  

Science Journals Connector (OSTI)

The variational procedure in the effective-mass and parabolic-band approximations is used in order to investigate the effects of crossed electric and in-plane magnetic fields on the electronic and exciton properties in semiconductor heterostructures. Calculations are performed for bulk GaAs and GaAs?Ga1?xAlxAs quantum wells, for applied magnetic fields parallel to the layers and electric fields in the growth direction, and it is shown that the combined effects on the heterostructure properties of the applied crossed electric and magnetic fields and the direct coupling between the center-of-mass and internal exciton motions may be dealt with via a simple parameter representing the spatial distance between the centers of the electron and hole magnetic parabolas. Exciton properties are analyzed by using a simple hydrogenlike envelope excitonic wave function and present theoretical results are found in fair agreement with available experimental measurements on the diamagnetic shift of the photoluminescence peak position of GaAs?Ga1?xAlxAs quantum wells under in-plane magnetic fields.

M. de Dios-Leyva, C. A. Duque, and L. E. Oliveira

2007-01-02T23:59:59.000Z

498

INTRODUCTION The Electrical Charge and Relativity  

E-Print Network [OSTI]

INTRODUCTION The Electrical Charge and Relativity This course starts with the introduction of concepts related to just electricity: charge, electric field, electric potential energy, conservation of electric energy, etc. Notice that latter terms sound already very familiar to what you have learned in PH

499

Electricity Reliability  

E-Print Network [OSTI]

Electricity Delivery and Energy Reliability High Temperature Superconductivity (HTS) Visualization in the future because they have virtually no resistance to electric current, offering the possibility of new electric power equipment with more energy efficiency and higher capacity than today's systems

500

Thermionic electric converter  

SciTech Connect (OSTI)

A thermionic electric converter is disclosed wherein an externally located heat source causes electrons to be boiled off an electron emissive surface interiorly positioned on one end wall of an evacuated cylindrical chamber. The electrons are electrically focused and accelerated through the interior of an air core induction coil located within a transverse magnetic field, and subsequently are collected on the other end wall of the chamber functioning as a collecting plate. The emf generated in the induction coil by action of the transiting electron stream interacting with the transverse magnetic field is applied to an external circuit to perform work, thereby implementing a direct heat energy to electrical energy conversion.

Davis, E.D.

1981-12-01T23:59:59.000Z