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1

Applications of the VLF Induction Method For Studying Some Volcanic  

Open Energy Info (EERE)

the VLF Induction Method For Studying Some Volcanic the VLF Induction Method For Studying Some Volcanic Processes of Kilauea Volcano, Hawaii Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Applications Of The Vlf Induction Method For Studying Some Volcanic Processes Of Kilauea Volcano, Hawaii Details Activities (1) Areas (1) Regions (0) Abstract: The very low-frequency (VLF) induction method has found exceptional utility in studying various volcanic processes of Kilauea volcano, Hawaii because: (1) significant anomalies result exclusively from ionically conductive magma or still-hot intrusions (> 800°C) and the attendant electrolytically conductive hot groundwater; (2) basalt flows forming the bulk of Kilauea have very high resistivities at shallow depths that result in low geologic noise levels and relatively deep depths of

2

Mapping groundwater contamination using dc resistivity and VLF geophysical methods -- A case study  

SciTech Connect

Geophysical methods can be helpful in mapping areas of contaminated soil and groundwater. Electrical resistivity and very low-frequency electromagnetic induction (VLF) surveys were carried out at a site of shallow hydrocarbon contamination in Utah County, Utah. Previously installed monitoring wells facilitated analysis of water chemistry to enhance interpretation of the geophysical data. The electrical resistivity and VLF data correlate well, and vertical cross-sections and contour maps generated from these data helped map the contaminant plume, which was delineated as an area of high interpreted resistivities.

Benson, A.K.; Payne, K.L.; Stubben, M.A. [Brigham Young Univ., Provo, UT (United States). Dept. of Geology and Geophysics

1997-01-01T23:59:59.000Z

3

Applications of the VLF Induction Method For Studying Some Volcanic...  

Open Energy Info (EERE)

Login | Sign Up Wiki Browse Latinoamrica Buildings Clean Energy Economy Coordinated Low Emissions Assistance Network Geothermal Incentives and Policies International Clean Energy...

4

Exploration of a lignite-bearing basin in Northern Ireland using ground magnetic and VLF-EM methods  

SciTech Connect

In an exploration technique feasibility study, a detailed magnetic and VLF-EM survey was carried out on the poorly exposed, lignite-bearing Crumlin subbasin within the Lough Neagh Basin, Co. Antrim, Northern Ireland. The faulted and onlapped margins of the basin, as well as lithological units and structures within the basin, were delineated by simple processing techniques applied to the data. The combination of the two methods overcomes the limitations of each method when it is used alone. These techniques could be successfully applied to other lignite-bearing basins sited on strongly magnetic basement worldwide.

McCaffrey, R.J.; McElroy, W.J.; Leslie, A.G. [Queen`s Univ. of Belfast (United Kingdom)

1995-03-01T23:59:59.000Z

5

INDUCTION MOTOR FAULT DIAGNOSTIC AND MONITORING METHODS  

E-Print Network (OSTI)

INDUCTION MOTOR FAULT DIAGNOSTIC AND MONITORING METHODS by Aderiano M. da Silva, B.S. A Thesis;i Abstract Induction motors are used worldwide as the "workhorse" in industrial applications material. However, induction motor faults can be detected in an initial stage in order to prevent

Povinelli, Richard J.

6

VLF wave stimulation experiments in the magnetosphere from Siple Station, Antarctica  

SciTech Connect

The experimental methods used in the VLF stimulation experiments at the Siple Station, Antarctica, are described together with the results of observations and their interpretations. Consideration is given to the equipment employed in the experiments, with special attention to the Jupiter VLF transmitter, and to the methodology used to stimulate VLF signals. Data are presented on the following types of experiments: (1) single-frequency growth and triggering, (2) frequency ramp, (3) multifrequency, and (3) noise simulation. The possibilities for new controlled VLF wave injection experiments in the earth's magnetospheric plasma are discussed. 44 references.

Helliwell, R.A.

1988-08-01T23:59:59.000Z

7

Vlf Electromagnetic Investigations Of The Crater And Central Dome Of Mount  

Open Energy Info (EERE)

Vlf Electromagnetic Investigations Of The Crater And Central Dome Of Mount Vlf Electromagnetic Investigations Of The Crater And Central Dome Of Mount St Helens, Washington Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Vlf Electromagnetic Investigations Of The Crater And Central Dome Of Mount St Helens, Washington Details Activities (1) Areas (1) Regions (0) Abstract: A very low frequency (VLF) electromagnetic induction survey in the crater of Mount St. Helens has identified several electrically conductive structures that appear to be associated with thermal anomalies and ground water within the crater. The most interesting of these conductive structures lies beneath the central dome. It is probably a partial melt of dacite similar to that comprising the June 1981 lobe of the central dome. Author(s): James N. Towle

8

Method of processing materials using an inductively coupled plasma  

DOE Patents (OSTI)

A method for making fine power using an inductively coupled plasma. The method provides a gas-free environment, since the plasma is formed without using a gas. The starting material used in the method is in solid form.

Hull, Donald E. (Los Alamos, NM); Bieniewski, Thomas M. (Los Alamos, NM)

1990-01-01T23:59:59.000Z

9

Method of processing materials using an inductively coupled plasma  

SciTech Connect

A method for coating surfaces or implanting ions in an object using an inductively coupled plasma. The method provides a gas-free environment, since the plasma is formed without using a gas. The coating material or implantation material is intitially in solid form.

Hull, Donald E. (Los Alamos, NM); Bieniewski, Thomas M. (Los Alamos, NM)

1989-01-01T23:59:59.000Z

10

VLF remote sensing of the auroral electrojet  

SciTech Connect

The authors present data taken to test the use of phase and amplitude variations in ground based VLF wave propogation measurements as a means of determining the location of the auroral electrojet. High-energy (> 300 keV) precipitating electrons at the edge of the electrojet can induce phase and amplitude variations in VLF waves propogating through that region of the atmosphere. The authors present measurements made in conjunction with conventional magnetometer measurements as a way to validate this technique. Satellite measurements of field-aligned currents were available for one night of observations.

Cummer, S.A.; Bell, T.F.; Inan, U.S. [Stanford Univ., Stanford, CA (United States)] Zanetti, L.J. [Johns Hopkins Univ., Laurel, MD (United States)

1996-03-01T23:59:59.000Z

11

Ionospheric modification with a VLF transmitter  

SciTech Connect

Detectable heating of the nighttime D region by a 28.5 kHz signal is observed in 16 out of 144 cases with events occurring under conditions of moderate to low D region electron densities as represented by the unperturbed VLF signal levels. Three dimensional modeling of the effects of NAU heating on a probe VLF signal predicts values in general agreement with observations and suggests that maximum effects should occur under tenuous D region conditions. 11 refs., 6 figs., 2 tabs.

Inan, U.S.; Rodriguez, J.V.; Lev-Tov, S.; Oh, J. (Stanford Univ., CA (United States))

1992-10-23T23:59:59.000Z

12

Method of processing materials using an inductively coupled plasma  

DOE Patents (OSTI)

A method of processing materials. The invention enables ultrafine, ultrapure powders to be formed from solid ingots in a gas free environment. A plasma is formed directly from an ingot which insures purity. The vaporized material is expanded through a nozzle and the resultant powder settles on a cold surface. An inductively coupled plasma may also be used to process waste chemicals. Noxious chemicals are directed through a series of plasma tubes, breaking molecular bonds and resulting in relatively harmless atomic constituents. 3 figs.

Hull, D.E.; Bieniewski, T.M.

1987-04-13T23:59:59.000Z

13

VLF Technique and Science in India  

Science Conference Proceedings (OSTI)

Since IGY period (1957-58), natural and artificially produced Very Low Frequency (VLF) electromagnetic radiations are being recorded at large number of ground stations and on board satellites to study various wave-plasma interactive phenomena. The terrestrial propagation of these VLF radio waves are primarily enabled through the earth ionosphere wave guide (EIWG) system to long horizontal distances around the globe and ducted along the geomagnetic field lines into the conjugate hemisphere through the ionosphere-plasmasphere-magnetosphere routes. The time frequency spectra indicate presence of dispersion and various cut-off frequencies providing several types of received signals like whistlers, chorus, tweeks, hiss, hisslers etc., which can be heard on an earphone with distinguishing audio structures. While the VLF technique has been a very effective tool for studying middle and high latitude phenomena, the importance of various anomalous characteristics over the Indian low latitude stations provide potentially new challenges for their scientific interpretation and modelling. The ducted and non-ducted propagation, low latitude TRIMPI/TLE effects, D-region ionisation perturbations due to solar and stellar x- and {gamma} ray emissions and detecting precursors of seismic activities are a few problems which will gain from low latitude studies. Since the conjugate points of Indian stations lie over the Indian oceanic region, the VLF propagation effects would be relatively noise free to observe rare and new phenomena requiring better SNR to detect such changes. The VLF signals emanating from the active seismic zones would require high sensitivity of the system and suitable network of transmitting and receiving stations. Results obtained on whistlers and related studies from a number of Indian stations covering geomagnetic latitude range between 13-24 deg. N are mentioned and reviewed in the background of theoretical understanding of the lightning return stroke signal elements, VLF propagation through cold plasma, ionospheric wave guide mode, electron precipitation due to cyclotron resonance and production of ionisation in the D-region due to solar/stellar UV/X/{gamma}-rays. Further use of the VLF technique in terms of improving both observational data for real time monitoring/modelling of geophysical phenomena and exploring space weather conditions are considered as part of a future Indian programme.

Chakravarty, S. C. [Member, Governing Body, Indian Centre for Space Physics, Kolkata (India)

2010-10-20T23:59:59.000Z

14

A Survey of Methods for Scaling Up Inductive Algorithms  

Science Conference Proceedings (OSTI)

One of the defining challenges for the KDD research community is to enable inductive learning algorithms to mine very large databases. This paper summarizes, categorizes, and compares existing work on scaling up inductive algorithms. We concentrate ... Keywords: decision trees, inductive learning, rule learning, scaling up

Foster Provost; Venkateswarlu Kolluri

1999-06-01T23:59:59.000Z

15

ELF and VLF radiation from the polar electrojet antenna  

SciTech Connect

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

Barr, R.; Stubbe, P.

1984-07-01T23:59:59.000Z

16

VLF versus MF heating of the lower ionosphere  

SciTech Connect

The perturbation in the signal strength of a VLF transmitter by another transmitter heating the ionosphere on the great circle path to the receiver is calculated for two cases: The NAA-Palmer path heated by the VLF transmitter, NAU, and the Omega Norway-Skibotn path heated by the MF transmitter, heating, near Tromsoe. Comparison implies either that VLF heating is over 100 times more effective than MF heating in terms of the perturbation produced, per RF heating watt, in VLF propagation in the Earth-ionosphere wave-guide or that the observed effect at Palmer is fortuitous or spurious.

Dowden, R.L.; Adams, C.D.D. (Univ. of Otago, Dunedin (New Zealand))

1991-08-01T23:59:59.000Z

17

Whistler precursors on a VLF transmitter signal  

SciTech Connect

Whistler precursors are discrete emissions which are occasionally seen just before two-hop whistlers. Most theories of precursors assume they are triggered emissions and focus on creating a triggering signal with the proper time delay from the causative sferic. Whistler precursors have now been seen on a signal from the Siple VLF transmitter. Phase analysis shows that these precursors are caused by a rapid increase in growth activity, and not by a triggering signal.

Paschal, E.W. (Stanford Univ., CA (United States))

1990-01-01T23:59:59.000Z

18

Ionospheric VLF waves and optical phenomena over active thunderstorms. [VLF (very low frequency)  

SciTech Connect

In 1987 and 1988, two campaigns, the Wave Induced Particle Precipitation campaign and the Thunderstorm II campaign, were conducted to investigate lightning-generated effects in the upper atmosphere and ionosphere. Two rockets and 6 balloons were launched near thunderstorms in these campaigns. Optical and electrical signals from hundreds of lightning strokes were recorded. The author has been able to study some problems about lightning-generated VLF waves in the ionosphere which have not been well investigated previously. This dissertation reports the following: (1) The downward-looking optical detector on the rocket recorded some anomalous characteristic optical phenomena. (2) The author studied the relation between the amplitude of lightning-generated VLF waves in the ionosphere and the lightning current recorded by the SUNYA lightning network. This study shows that the amplitude of waves at frequencies below 5 kHz has linear response to the lightning current. (3) The author has been able to determine the propagation path of the lightning-generated VLF waves from the source to the rocket. The path is consistent with the leaky waveguide hypothesis. (4) The amplitude of lightning-generated VLF waves has been found to have maxima and minima at different altitudes, instead of being attenuated monotonically with altitude as expected. A theoretical model has been proposed which shows that the wave amplitude profiles are the result of interference between waves from an aperture area below the rocket. (5) The author numerically calculated the absorption of VLF waves at the bottom of the ionosphere. The electron density gradient of the ionosphere was taken into account. The characteristics of the absorption, such as the frequency dependence, were investigated. The author deduced that significant heating of the ionosphere is caused by lightning-generated VLF waves.

Li, Y.Q.

1993-01-01T23:59:59.000Z

19

Method and system for determining induction motor speed ...  

A non-linear, semi-parametric neural network-based adaptive filter is utilized to determine the dynamic speed of a rotating rotor within an induction motor, without ...

20

VLF heating of the lower ionosphere  

SciTech Connect

A controlled wave-injection experiment with a 28.5 kHz transmitter having a radiated power of 100 kW has revealed evidence of ionospheric heating by the VLF waves. Calculations indicate that the observed effect can be attributed to the absorption of wave energy in the lower ionosphere, which is estimated to result in a 30% enhancement in the collision frequency at 85 km. This process also represents a new means of direct coupling of lightning energy to the lower ionosphere.

Inan, U.S. (Stanford Univ., CA (USA))

1990-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "vlf induction method" 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

Different methods for direct torque control of induction motor fed from current source inverter  

Science Conference Proceedings (OSTI)

Two different methods for direct torque control (DTC) of induction motor fed from current source inverter (CSI) is analyzed in the paper. The first one is derived from well-known DTC strategy developed for voltage inverter drives. This type of control ... Keywords: CSI, DTC, constant switching, hysteresis comparator, induction motor

Aleksandar Nikolic; Borislav Jeftenic

2008-07-01T23:59:59.000Z

22

ISEE-1 observations in the magnetosphere of VLF emissions triggered by nonducted coherent VLF waves during VLF wave-injection experiments  

SciTech Connect

It is noted that recent data from the ISEE-1 spacecraft indicate that VLF emissions triggered by nonducted coherent VLF waves often possess spectral characteristics markedly different from those of emissions triggered by ducted waves. Emission triggering by nonducted waves is found to involve a strong path selectiveness. It is also established that emission triggering by nonducted waves can take place over a wide L-range and may involve inner radiation belt particles of energy up to 200 keV. It is concluded that the VLF emission generation process can occur under much more general conditions than previously believed on the basis of the results of ground-to-ground wave-injection experiments.

Bell, T.F.; Inan, U.S.

1981-01-01T23:59:59.000Z

23

Bias Elimination and Scatter in Lightning Location by the VLF Arrival Time Difference Technique  

Science Conference Proceedings (OSTI)

In the very low frequency (VLF) band lightning flashes are detectable at ranges of several thousand kilometers. Studies of experimental data show that if systematic biases were eliminated from the U.K. Meteorological Office's VLF arrival time ...

Anthony C. L. Lee

1990-10-01T23:59:59.000Z

24

High voltage VLF testing of power cables  

SciTech Connect

This publication describes a laboratory test program conducted with the objective to develop a test that would replace the existing dc withstand test. The article describes the methodology used to establish the voltage duration and magnitude of VLF (0.1 Hz) high voltage field tests suitable for crosslinked polyethylene (XLPE) insulated power cable. The results show that the voltage breakdown of laboratory aged XLPE cable at 0.1 Hz is approximately equal to that at 60 Hz, that proof tests at 0.1 Hz is approximately equal to that at 60 Hz, that proof tests at 0.1 Hz cause very little damage to the cable, and that 0.1 Hz testing appears to be a satisfactory alternate to dc testing. Preliminary values are suggested for voltage magnitude and time duration of cable acceptance, maintenance and proof tests at 0.1 Hz for XLPE cable rated up to 35 kV. A program is underway to similarly evaluate samples of service-aged XLPE cable; as well as to demonstrate the use of the preliminary test values at typical utility installations.

Eager, G.S.; Katz, C.; Fryszczyn, B. [Cable Technology Labs., Inc., New Brunswick, NJ (United States); Densley, J. [Ontario Hydro, Toronto, Ontario (Canada); Bernstein, B.S. [EPRI, Washington, DC (United States)

1997-04-01T23:59:59.000Z

25

Effects of energetic particle events on VLF/LF propagation parameters/1989. Interim report. [VLF/LF (very low frequency/low frequency)  

SciTech Connect

This report is a summary of disturbance effects of three major energetic particle events (PCA's) on VLF/LF propagation parameters as observed by the Phillips Laboratory High Resolution Oblique VLF/LF Ionosounder located in northern Greenland. Disturbance effects on ionospheric reflectivity parameters, including deduced reflection heights and plane wave reflection coefficients, are presented along with riometer, magnetometer, and satellite particle detector data. VLF/LF propagation, Ionospheric disturbances, Polar cap absorption events, Oblique ionosounding.

Klemetti, W.I.; Rasmussen, J.E.; Kossey, P.A.

1992-12-04T23:59:59.000Z

26

Deriving ionospheric system parameters from VLF transmitter signal analysis  

Science Conference Proceedings (OSTI)

The lower layers of the earths ionosphere are important for long range data transmission in the very low frequency range (VLF) and of general geophysical interest as X-ray and particle bursts of solar and other origin leave their fingerprints there. ... Keywords: ionosphere, optimization algorithms, signal processing, system parameter identification, wavelet and Fourier transforms

Ernst D. Schmitter

2008-07-01T23:59:59.000Z

27

Observations of the characteristics of propagation of VLF signals during meridian transits by Sco X-1  

SciTech Connect

The authors have conducted a series of studies of the VLF propagation characteristics during coordinated radio, optical, ultraviolet, and X-ray observations of the X-ray star Sco X-1. The observations were taken from 9-12 March 1989, a period when Sco X-1 was particularly active, and during a time of intense day-side solar activity. VLF sites were used to obtain phase and amplitude data from the VLF transmitter and from more remote transmitters. This paper gives preliminary results which compare the time-varying X-ray flux with the VLF phase data taken during the observation.

Beall, J.H.; Wood, K.S.; Kelly, F.J.

1990-05-03T23:59:59.000Z

28

Trapped electron losses by interactions with coherent VLF waves  

SciTech Connect

VLF whistler waves from lightning enter the magnetosphere and cause the precipitation of energetic trapped electrons by pitch angle scattering. These events, known as Lightning-induced Electron Precipitation (LEP) have been detected by satellite and rocket instruments and by perturbations of VLF waves traveling in the earth-ionosphere waveguide. Detailed comparison of precipitating electron energy spectra and time dependence are in general agreement with calculations of trapped electron interactions with ducted whistler waves. In particular the temporal structure of the precipitation and the dynamic energy spectra of the electrons confirm this interpretation of the phenomena. There are discrepancies between observed and measured electron flux intensities and pitch angle distributions, but these quantities are sensitive to unknown wave intensities and trapped particle fluxes near the loss cone angle. The overall effect of lightning generated VLF waves on the lifetime of trapped electrons is still uncertain. The flux of electrons deflected into the bounce loss cone by a discrete whistler wave has been measured in a few cases. However, the area of the precipitation region is not known, and thus the total number of electrons lost in an LEP event can only be estimated. While the LEP events are dramatic, more important effects on trapped electrons may arise from the small but numerous deflections which increase the pitch angle diffusion rate of the electron population. {copyright} {ital 1996 American Institute of Physics.}

Walt, M.; Inan, U.S. [Space, Telecommunications and Radioscience Laboratory, Stanford University, Stanford, California (United States); Voss, H.D. [Lockheed Missiles and Space Co. (United States)

1996-07-01T23:59:59.000Z

29

Outer zone electron precipitation produced by a VLF transmitter  

SciTech Connect

By means of high-resolution pitch angle measurements made by a magnetic-focusing electron spectrometer on the S3-3 satellite while in the drift loss cone region of the magnetosphere, characteristics of fluxes of 108- to 654-keV electron precipitated in the inner zone, in the slot region, and in the outer zone of the magnetosphere are all shown to be consistent with the precipitation's having been produced by the same ground-based VLF transmitter, UMS. Pitch angle measurements are used to locate the longitude of precipitation. The temporal pattern of transmitter operation obtained from synoptic data from a ground-based VLF receiver is used along with drift rate calculations to predict the electron energies as a function of L shell which should be observable by the S3-3 instrument. The predicted energy response is then compared with the in situ observations, getting complete agreement. Finally, wave-particle resonance calculations are made for each of the three regions. The study indicates that ground-based VLF transmitters, which have previously been shown to produce precipitation in the inner zone and slot regions, are almost certainly instrumental in precipitating electrons in the outer zone also. copyright American Geophysical Union 1988

Vampola, A.L.; Adams, C.D.

1988-03-01T23:59:59.000Z

30

VLF heating of the lower ionosphere: Variation with magnetic latitude and electron density profile  

SciTech Connect

The authors report the results of calculations of ionospheric absorption of VLF heating radiation, in comparison with HF heating. This work was motivated by recent observations of the effects of VLF heating, which indicate that it is much more efficient than HF heating, at least for certain ionospheric conditions. The authors assume an ionospheric model which is consistent with that observed during the previous heating experiments. Their results are in basic agreement with the experimental observations. They find that the enhancement in efficiency of VLF heating over HF heating is a feature of low latitudes, where ionospheric density profiles favor this effect. In the polar regions, HF heating is more efficient.

Barr, R. (National Institute of Water and Atmospheric Research Ltd., Lower Hutt (New Zealand)); Stubbe, P. (Max Planck Institut fuer Aeronomie, Katlenburg-Lindau (Germany))

1992-09-04T23:59:59.000Z

31

Method for reducing peak phase current and decreasing staring time for an internal combustion engine having an induction machine  

DOE Patents (OSTI)

A method for reducing the starting time and reducing the peak phase currents for an internal combustion engine that is started using an induction machine starter/alternator. The starting time is reduced by pre-fluxing the induction machine and the peak phase currents are reduced by reducing the flux current command after a predetermined period of time has elapsed and concurrent to the application of the torque current command. The method of the present invention also provides a strategy for anticipating the start command for an internal combustion engine and determines a start strategy based on the start command and the operating state of the internal combustion engine.

Amey, David L. (Birmingham, MI); Degner, Michael W. (Farmington Hills, MI)

2002-01-01T23:59:59.000Z

32

Recovery signatures of lightning-associated VLF perturbations as a measure of the lower ionosphere  

SciTech Connect

A new model of the physical processes associated with subionospheric VLF signal perturbations caused by lightning-induced electron precipitation (LEP) bursts is developed to diagnose the state of the lower ionosphere (e.g., electron number density and rate coefficients for various chemical reactions) on the basis of measurements of VLF recovery signatures. The model accounts for the energy spectrum of the electron bursts precipitated by lightning-generated whistlers, the chemical relaxation of enhanced secondary ionization in the nightime D region due to LEP bursts, and quantitatively treats the resultant effects on propagation of the VLF signal in the Earth-ionosphere waveguide. Application of the model to experimental data obtained for the VLF propagation path from NPM station (Hawaii) to Palmer station (Antarctica) indicates that effective electron detachment rate {gamma}, enhanced secondary ionization profile (e.g., energy content of LEP bursts), as well as the ambient electron density distribution, may be estimated using observed subionospheric VLF recovery signatures. The effective detachment rate was identified as {approximately}10{sup 18} N s{sup {minus}1}, where N is total number density of neutrals. Model indicates in particular that the attachment-detachment processes play the dominant role in recovery of subionospheric VLF signal perturbations on timescales {approximately}100 s, and that the observed perturbations of the NPM-Palmer signal correspond to the LEP bursts consisting of relatively soft (< 250 keV) electrons. 33 refs., 24 figs.

Pasko, V.P.; Inan, U.S. [Stanford Univ., CA (United States)

1994-09-01T23:59:59.000Z

33

Investigating different passive methods for enhancement of low voltage ride through capability of Doubly Fed Induction Generator  

Science Conference Proceedings (OSTI)

In recent years with the increasing use of wind generators in power systems the issue of keeping these generators stable and maintaining their connection to the network in the presence of fault or voltage sag has gained a great importance. In this paper some enhancement methods for the low voltage ride through of Doubly Fed Induction Generator (DFIG)

2013-01-01T23:59:59.000Z

34

DE 1 VLF observations during Activny wave injection  

SciTech Connect

The authors report on coordinated high-altitude satellite observations in support of one of the first space-based VLF wave injection experiments, namely the USSR Aktivny mission. The Activny satellite (A) was designed to carry a VLF transmitter (nominal frequency {approximately}10 kHz, transmitter power {approximately}10 kW) coupled to a 20-m-diameter loop antenna in a nearly polar orbit (83 inclination, apogee {approximately}2500 km, perigee {approximately}500 km). The authors focus their attention on conjunction experiments between the Activny and DE 1 satellites. Because of problems in the deployment of the loop antenna, the radiated power capability of the antenna was significantly reduced. Although this substantially reduced the expectation of receiving detectable signal levels on the satellite, the DE 1/Activny conjunction experiments were nevertheless carried out as a means of possibly placing an upper limit on the radiated power. During the period November 1989 through April 1990, a total of 10 DE 1/Activny wave injection sessions were conducted. During each session the Activny transmitter operated at 10.537 kHz with 1 s On-1 s Off format, for a period of 6 min centered around the conjunction time. Though no Activny signals were detected by the LWR on the DE 1 satellite, the experimental constraints allow the authors to place an upper limit on the total power radiated by the Activny transmitter in the whistler-mode. Using experimental parameters, and the minimum detectable signal level of 0.05 {mu}V/m for LWR, they find the upper limit on the total power radiated by the Activny satellite in the whistler-mode to be {approximately}10 mW. Several recommendations for future space-based wave injection experiments are presented. 25 refs., 12 figs., 3 tabs.

Sonwalkar, V.S.; Inan, U.S.; Bell, T.F. [Stanford Univ., CA (United States)] [and others

1994-04-01T23:59:59.000Z

35

Method and apparatus for pulse width modulation control of an AC induction motor  

SciTech Connect

An inverter is connected between a source of DC power and a three-phase AC induction motor, and a micro-processor-based circuit controls the inverter using pulse width modulation techniques. In the disclosed method of pulse width modulation, both edges of each pulse of a carrier pulse train are equally modulated by a time proportional to sin .THETA., where .THETA. is the angular displacement of the pulse center at the motor stator frequency from a fixed reference point on the carrier waveform. The carrier waveform frequency is a multiple of the motor stator frequency. The modulated pulse train is then applied to each of the motor phase inputs with respective phase shifts of 120.degree. at the stator frequency. Switching control commands of electronic switches in the inverter are stored in a random access memory (RAM) and the locations of the RAM are successively read out in a cyclic manner, each bit of a given RAM location controlling a respective phase input of the motor. The DC power source preferably comprises rechargeable batteries and all but one of the electronic switches in the inverter can be disabled, the remaining electronic switch being part of a "flyback" DC-DC converter circuit for recharging the battery.

Geppert, Steven (Bloomfield Hills, MI); Slicker, James M. (Union Lake, MI)

1984-01-01T23:59:59.000Z

36

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

SciTech Connect

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

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

1991-02-01T23:59:59.000Z

37

Method and apparatus for monitoring the rotating frequency of de-energized induction motors  

DOE Patents (OSTI)

The rotational speed of a coasting induction motor is measured by sensing e residual electrical voltages at the power terminals of the motor, thus eliminating the need for conventional tachometer equipment, additional mechanical components or modifications to the induction motor itself. The power terminal voltage signal is detected and transformed into a DC voltage proportional to the frequency of the signal. This DC voltage can be input to the control system of a variable frequency motor controller to regulate the output characteristics thereof relative to the speed of the coasting motor.

Mikesell, Harvey E. (McMurray, PA); Lucy, Eric (Murrysville, PA)

1998-01-01T23:59:59.000Z

38

Method and apparatus for monitoring the rotating frequency of de-energized induction motors  

DOE Patents (OSTI)

The rotational speed of a coasting induction motor is measured by sensing e residual electrical voltages at the power terminals of the motor, thus eliminating the need for conventional tachometer equipment, additional mechanical components or modifications to the induction motor itself. The power terminal voltage signal is detected and transformed into a DC voltage proportional to the frequency of the signal. This DC voltage can be input to the control system of a variable frequency motor controller to regulate the output characteristics thereof relative to the speed of the coasting motor. 6 figs.

Mikesell, H.E.; Lucy, E.

1998-02-03T23:59:59.000Z

39

Propagation of beam-driven VLF waves from the ionosphere toward the ground  

SciTech Connect

As part of the Cooperative High Altitude Rocket Gun Experiment (CHARGE-2B) rocket mission, an electron beam was injected into the ionosphere with a modulated beam current in an effort to generate very low frequency (VLF) waves. The propagation of the beam-driven VLF waves through the ionosphere is examined here to determine whether it is possible to detect these wave emissions with ground receivers. The paths of the VLF waves from where they were generated near the rocket were followed to the bottom of the ionosphere and the decrease in wave amplitude due to wave-particle resonance and collisional damping was calculated. It was found that due to collisional damping, which for these VLF waves becomes large at altitudes below about 150 km, wave amplitudes were decreased below the background atmospheric noise level. A number of different beam injection events have been examined and in all of the cases studied the waves were sufficiently damped such that detection on the ground would not be possible. This is in agreement with observations on the ground in which no wave emissions were observed during the CHARGE-2B mission. Control parameters that would be more favorable for beam-generated VLF propagation to the ground are discussed for future experiments of this type. 23 refs., 8 figs., 1 tab.

Schriver, D.; Sotnikov, V.I.; Ashour-Abdalla, M. [Univ. of California, Los Angeles, CA (United States)] [and others

1995-03-01T23:59:59.000Z

40

A spectral Galerkin method for the coupled Orr-Sommerfeld and induction equations for free-surface MHD  

Science Conference Proceedings (OSTI)

We develop and test spectral Galerkin schemes to solve the coupled Orr-Sommerfeld and induction equations for parallel, incompressible MHD in free-surface and fixed-boundary geometries. The schemes' discrete bases consist of Legendre internal shape functions, ... Keywords: 65L15, 65L60, 76E05, 76E17, 76E25, Eigenvalue problems, Free-surface MHD, Hydrodynamic stability, Orr-Sommerfeld equations, Spectral Galerkin method

Dimitrios Giannakis; Paul F. Fischer; Robert Rosner

2009-03-01T23:59:59.000Z

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41

Interlaboratory Validation of EPA 1600 Series Methods: Draft EPA Method 1638 for Analysis of Metals in Water by Inductively Coupled Plasma -- Mass Spectrometry (ICP-MS)  

Science Conference Proceedings (OSTI)

Federal and state permits are requiring wastewater dischargers to monitor for ever lower concentrations of trace metals, in some cases at levels that may preclude reliable measurement. In this joint EPA-EPRI interlaboratory data collection effort, eight laboratories evaluated draft EPA Method 1638: Determination of Trace Elements in Ambient Water by Inductively Coupled Plasma-Mass Spectrometry. This method is intended for the analysis of low levels (parts per trillion) of antimony, cadmium, copper, lead,...

2000-11-27T23:59:59.000Z

42

Methods for producing the plasma initiation pulse in ohmic heating circuits in tokamak power reactors: resistive dissipation, transient inductive storage, and transient capacitive storage  

DOE Green Energy (OSTI)

This paper compares the resistive dissipation method with transient storage methods: inductive and capacitive. While the capacitive method is relatively well known through its variant, the ''Inall circuit,'' the inductive transient storage method to produce the plasma initiation pulse is less well known. It consists of two closely coupled coils, one connected with a system of differentially compounded slow discharge homopolar machines. The magnetic energy is suddenly taken from the ohmic heating circuit and temporarily stored in the mutual inductance of the two coils--thus producing the pulse.

Driga, M.D.; Mayhall, D.J.; Weldon, W.F.; Rylander, H.G.; Woodson, H.H.

1977-01-01T23:59:59.000Z

43

Perturbations of ionosphere-magnetosphere coupling by powerful VLF emissions from ground-based transmitters  

Science Conference Proceedings (OSTI)

The characteristics of the plasma-wave disturbances stimulated in the near-Earth plasma by powerful VLF radiation from ground-based transmitters are investigated. Radio communication VLF transmitters of about 1 MW in power are shown to produce artificial plasma-wave channels (density ducts) in the near-Earth space that originate in the lower ionosphere above the disturbing emission source and extend through the entire ionosphere and magnetosphere of the Earth along the magnetic field lines. Measurements with the onboard equipment of the DEMETER satellite have revealed that under the action of emission from the NWC transmitter, which is one of the most powerful VLF radio transmitters, the generation of quasi-electrostatic (plasma) waves is observed on most of the satellite trajectory along the disturbed magnetic flux tube. This may probably be indicative of stimulated emission of a magnetospheric maser.

Belov, A. S., E-mail: alexis-belov@yandex.ru; Markov, G. A.; Ryabov, A. O. [Lobachevsky Nizhni Novgorod State University (Russian Federation); Parrot, M. [Environment Physics and Chemistry Laboratory (France)

2012-12-15T23:59:59.000Z

44

Results of VLF campaigns in Summer, Winter and during Solar Eclipse in Indian Subcontinent and Beyond  

SciTech Connect

VLF propagation effects are generally understood in terms of the earth-ionosphere waveguide. However, details of the theory are still incomplete. Particularly important are the newly emerging fields of VLF Astronomy where the ionosphere is treated as a giant detector for extraterrestrial energetic phenomena and the subject of lithosphere-ionosphere coupling where the the disturbances of this giant detector is influenced by terrestrial events, especially earthquakes and other seismic activities. We review the activities of our group in these fields. In particular, we concentrate on the results of the VLF campaigns we conducted using over a dozen receiving stations in Summer, in Winter and during the Total Solar eclipse in July, 2009. We also discuss briefly the results we obtained in Antarctica and their implications.

Chakrabarti, Sandip K. [S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata (India); Indian Centre for Space Physics, 43 Chalantika, Garia Station Rd., Kolkata 700084 (India); Sasmal, S.; Mondal, S. K. [Indian Centre for Space Physics, 43 Chalantika, Garia Station Rd., Kolkata 700084 (India); Pal, S. [S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata (India)

2010-10-20T23:59:59.000Z

45

VLF and LF signatures of mesospheric/lower ionospheric response to lightning discharges  

SciTech Connect

New evidence is presented of disturbances of the electrical conductivity of the nighttime mesosphere and the lower ionosphere in association with lightning discharges. In addition to extensive documentation of the characteristics of a class of event heretofore referred to as early/fast VLF events [Inan et al.], this data reveal a new feature of these events, consisting of a postonset peak that typically lasts for 1-2 s. The authors also report the observation of short-duration VLF or LF perturbation, in which the amplitude of the subionospheric signal exhibits a sudden change within 20 ms of the causative lightning discharge, and recovers back to its original level in < 3 s. These short-duration events have characteristics similiar to the previously observed rapid onset, rapid decay VLF signatures [Dowden et al.]. Both the typical and rapidly recovering events are observed primarily when the causative lightning discharge is within {+-}50 km of the VLF or LF great circle propagation path, indicating that the scattering from the localized disturbance is highly collimated in the forward direction. The latter in turn implies that for the parameters in hand, the transverse extent of the disturbance must be at least {approximately} 100-150 km. The measured VLF signatures are compared with the predictions of a three-dimensional model of subionospheric VLF propogation and scattering in the presence of localized ionospheric disturbances produced by electromagnetic impulses and quasi-electrostatic (QE) fields produced by lightning discharges. The rapidly recovering or short-duration events are consistent with the heating of the ambient electrons by quasi-static electric fields, in cases when heating is not intense enough to exceed the attachment or ionization thresholds. When no significant electron density changes occur, the conductivity changes due to heating alone last only as long as the QE fields, typically less than a few seconds. 29 refs., 12 figs.

Inan, U.S.; Slingeland, A.; Pasko, V.P. [Stanford Univ., Stanford, CA (United States); Rodriguez, J.V. [Phillips Laboratory, Hanscom Air Force Base, MA (United States)

1996-03-01T23:59:59.000Z

46

Computation of VLF response over half-plane and wedge models  

SciTech Connect

A theoretical solution is presented to the problem where a VLF anomaly is generated by a conducting half-plane or a perfectly conducting wedge below a stratified overburden. The solution is obtained by the use of a scattering matrix for plane-wave eigenfunctions. VLF anomalies have been computed for different values of the conductance and dip of the halfplane. The phase of the VLF anomaly due to a conducting half-plane depends on the conductance and the distance to the half-plane. Close to the half-plane the tilt angle and ellipticity are of opposite sign for a perfect conductor, but the ellipticity will change sign for a poor conductor. The VLF anomaly for a perfectly conducting wedge is essentially determined by the position of the upper surface of the wedge, i.e. the anomaly will closely resemble the anomaly of a perfectly conducting half-plane in the same position as the upper surface of the wedge.

Olsson, O.

1983-02-01T23:59:59.000Z

47

An Operational System for the Remote Location of Lightning Flashes Using a VLF Arrival Time Difference Technique  

Science Conference Proceedings (OSTI)

An operational system for the remote location of lightning flashes at ranges of thousands of kilometers is presented. The vertical electric fields of VLF radio atmospherics (sferics), together with time data, are observed at a network of just ...

Anthony C. L. Lee

1986-12-01T23:59:59.000Z

48

Effective recombination coefficient and solar zenith angle effects on low-latitude D-region ionosphere evaluated from VLF signal amplitude and its time delay during X-ray solar flares  

E-Print Network (OSTI)

Excess solar X-ray radiation during solar flares causes an enhancement of ionization in the ionospheric D-region and hence affects sub-ionospherically propagating VLF signal amplitude and phase. In first part of the work, using the well known LWPC technique, we simulated the flare induced excess lower ionospheric electron density by amplitude perturbation method. Unperturbed D-region electron density is also obtained from simulation and compared with IRI-model results. Using these simulation results and time delay as key parameters, we calculate the effective electron recombination coefficient ($\\alpha_{eff}$) at solar flare peak region. Our results match with the same obtained by other established models. In the second part, we dealt with the solar zenith angle effect on D-region during flares. We relate this VLF data with the solar X-ray data. We find that the peak of the VLF amplitude occurs later than the time of the X-ray peak for each flare. We investigate this so-called time delay ($\\bigtriangleup t$)....

Basak, Tamal

2013-01-01T23:59:59.000Z

49

Impact of SPS heating on VLF, LF, and MF telecommunications systems ascertained by experimental means  

DOE Green Energy (OSTI)

The results of experiments undertaken to assess the potential impact of the operation of the Satellite Power System on the D and E regions of the ionosphere, and on telecommunication systems that are dependent upon the structure of the lower ionosphere are summarized. Using the high-power high-frequency transmitter facility located at Platteville, Colorado, power densities comparable to the Satellite Power System can be delivered to the heights of 70 to 100 km above the surface of the earth. Observations of the performance of telecommunication systems that operate in the VLF, LF, and MF portions of the spectrum have been investigated during times when the ionosphere was modified with SPS comparable power density and when it was not. The results obtained indicte that the SPS, as currently configured with a peak power density of 23 mW/cm/sup 2/, will not adversely impact upon the performance of VLF, LF, and MF telecommunication systems.

Rush, C.M.; Violette, E.J.; Espeland, R.H.; Carroll, J.C.; Allen, K.C.

1980-07-01T23:59:59.000Z

50

kappa. vector measurements of VLF signals by the satellite EXOS-D  

SciTech Connect

On board the EXOS-D (Akebono) satellite is a five channel PFX subsystem of VLF instruments, working to determine the wave normal of {kappa} vector and Poynting vector directions by measuring two components of E and three components of B fields using wire and loop antennas. In order to confirm the characteristics or capability of determining the {kappa} vector and the Poynting vector of a coherent VLF Omega signal transmitted from Australia have been analyzed. The observed Omega signal has been found to be right-handed polarized with Poynting vector is making a small angle with the geomagnetic field and lies nearly on the plane constructed by the geomagnetic field and {kappa} vector. The refractive index deduced from the E and B fields well agrees with that calculated by Appleton Hartree formula.

Yamamoto, Masayuki; Ito, Yoshihiko; Kishi, Yoji; Sawada, Akira; Kimura, Iwane (Kyoto Univ. (Japan)); Nagano, Isamu; Kennai, Eiichi (Kanazawa Univ. (Japan)); Okada, Toshimi (Toyama Prefectural Univ. (Japan)); Hashimoto, Kozo (Tokyo Denki Univ. (Japan))

1991-02-01T23:59:59.000Z

51

Modification of the lower ionosphere in lighting-induced electron precipitation events and through VLF heating  

SciTech Connect

Different mechanisms by which VLF waves from ground-based sources modify the nighttime lower ionosphere (D-region) are discussed. One process by which the ionosphere is regularly disturbed involves the precipitation of short (<2s) bursts of energetic (>40 keV) electrons out of the radiation belts in gyroresonant interactions with whistler waves launched by lightning discharges. A second process involves direct upward coupling of lightning electric fields to the lower ionosphere leading to intense electric fields and ionization enhancements. A third process is the heating of the lower ionosphere by upgoing VLF waves from ground-based transmitters and lightning, leading to up to 100% increase in electron temperature at 80-90 km altitudes 1.

Inan, U.S.

1990-10-01T23:59:59.000Z

52

An investigation into the nonlinear frequency shift in magnetospherically propagated VLF pulses  

SciTech Connect

When ducted narrow-band VLF pulses pass through the Earth's magnetosphere, small frequency shifts of [approximately] 1 Hz may be observed at the receiving site on the ground. Such shifts may be due to Doppler effects, but nonlinear electron cyclotron resonance near the magnetospheric equator may also play a part. This paper is a study of nonlinear frequency shifts induced by wave-particle interaction effects. The development assumes strong nonlinearity and the dominance of particle trapping. The VLF pulses are considered to be much shorter than the scale length of the interaction region; however, for long pulses the results remain valid for the front part of the pulse as seen at the receiving site. Numerical simulations for the NAA and Siple transmitters are performed using a Vlasov code. The results are in general agreement with the theoretical analysis. Experimental observations are reviewed, and future active experiments are suggested.

Shklyar, D.R. (IZMIRAN, Troitsk (Russian Federation)); Nunn, D. (Univ. of Southampton (United Kingdom)); Smith, A.J. (British Antarctic Survey, Cambridge (United Kingdom)); Sazhin, S.S. (Univ. of Sheffield (United Kingdom))

1992-12-01T23:59:59.000Z

53

Ionospheric VLF waves and optical phenomena over active thunderstorms. Ph.D. Thesis  

SciTech Connect

In 1987 and 1988, two campaigns, the Wave Induced Particle Precipitation campaign and the Thunderstorm 2 campaign, were conducted to investigate lightning-generated effects in the upper atmosphere and ionosphere. Two rockets (apogees 420km and 330km) and 6 balloons (float altitudes 30km) were launched near thunderstorms in these campaigns. Optical and electric signals from hundreds of lightning strokes were recorded by both the rockets and balloons. Using the data obtained in these two campaigns, the author has been able to study some problems about lightning-generated VLF waves in the ionosphere which have not been well investigated previously. In this dissertation, the author reports the following: the downward-looking optical detector on the rocket recorded some anomalous characteristic optical phenomena which had not been reported previously. This study shows that they occurred above the balloon altitude (30km), and the results are interpreted in terms of discharges at high altitudes. The author studied the relation between the amplitude of lightning-generated VLF waves in the ionosphere and the lightning current recorded by the SUNYA lightning network. This study shows that the amplitude of waves at frequencies below 5 kHz has linear response to the lightning current. Above 5 kHz, there is not a significant linear correlation between the wave amplitude and the lightning current. The author has been able to determine the propagation path of the lightning-generated VLF waves from the source to the rocket. The path is consistent with the leaky waveguide hypothesis in which waves travel in the waveguide to the vicinity of the rockets, and then propagate vertically through the ionosphere. The author has found that the amplitude of lightning generated VLF waves have maxima and minima at different altitudes instead of being attenuated monotonically with altitude as expected.

Li, Y.Q.

1993-01-01T23:59:59.000Z

54

Studies of VLF radio waves for sudden ionospheric disturbances (SID) in Kashmir region  

SciTech Connect

It is recognized that the ionosphere may be sensitive to seismic effects, and the detection of ionospheric perturbations associated with seismicity would be useful for short term prediction of seismic events. To observe this effect, Indian Centre for Space Physics has installed an antenna and receiver system at Kashmir University to monitor the variation of the VLF signal transmitted from VTX. We present the preliminary results from this station.

Wani, M. R.; Iqbal, Naseer [Department of Physics, University of Kashmir, Srinagar (India); Sasmal, Sudipta [Indian Centre for Space Physics, Kolkata (India)

2010-10-20T23:59:59.000Z

55

Signature of burst particle precipitation on VLF signals propagating in the Antarctic earth-ionosphere waveguide  

SciTech Connect

The burst precipitation of energetic electrons ({ge} 40 keV), induced by interactions with lightning-generated whistler mode waves, has been observed to cause phase and amplitude perturbations on subionospheric VLF signals (Trimpi events). With a knowledge of the propagation characteristics of the subionospheric signal, analysis of the perturbation details can lead to estimates of the energy, extent, and location of the precipitation. Trimpi events have been observed on VLF signals propagating at high latitudes (L {ge} 4) over Antarctica, on 3.79-kHz signals as they propagate from Siple toward VLF receivers at Halley and South Pole stations. To simulate the effects of precipitation, localized depressions in the ionospheric reflection height are introduced over the great circle propagation paths in the model, and it is seen that, while the amplitude (up to 6 dB) Trimpi events at Halley cannot be reproduced. Calculations are presented which show that signals echoing from precipitation patches located away from the great circle path could be the cause of such signatures.

Cotton, P.D. (Univ. of Sheffield (United Kingdom)); Smith, A.J. (Natural Environment Research Council, Cambridge (United Kingdom))

1991-11-01T23:59:59.000Z

56

Outer-zone electron precipitation produced by a vlf transmitter. Technical report  

SciTech Connect

Using high-resolution pitch-angle measurements made by a magnetic-focusing electron spectrometer on the S3-3 satellite while in the drift-loss-cone region of the magnetosphere, characteristics of fluxes of 108 to 654-keV electrons precipitated in the inner zone, in the slot region, and in the outer zone of the magnetosphere are all shown to be consistent with the precipitation having been produced by the same ground-based VLF transmitter, UMS. Pitch angle measurements are used to locate the longitude of precipitation. The temporal pattern of transmitter operation obtained from synoptic data from a ground-based VLF receiver is used along with drift-rate calculations to predict the electron energies as a function of L-shell which should be observable by the S3-3 instrument. The predicted energy response is then compared with the in-situ observations, getting complete agreement. Finally, wave-particle resonance calculations are made for each of the three regions. The study indicates that ground-based VLF transmitters, which have previously been shown to produce precipitation in the inner zone and slot regions, are almost certainly instrumental in precipitating electrons in the outer zone also.

Vampola, A.L.; Adams, C.D.

1988-03-01T23:59:59.000Z

57

Inductively-Charged High-Temperature Superconductors And Methods Of Use  

DOE Patents (OSTI)

The invention provides methods of charging superconducting materials and, in particular, methods of charging high-temperature superconducting materials. The methods generally involve cooling a superconducting material to a temperature below its critical temperature. Then, an external magnetic field is applied to charge the material at a nearly constant temperature. The external magnetic field first drives the superconducting material to a critical state and then penetrates into the material. When in the critical state, the superconducting material loses all the pinning ability and therefore is in the flux-flow regime. In some embodiments, a first magnetic field may be used to drive the superconducting material to the critical state and then a second magnetic field may be used to penetrate the superconducting material. When the external field or combination of external fields are removed, the magnetic field that has penetrated into the material remains trapped. The charged superconducting material may be used as solenoidal magnets, dipole magnets, or other higher order multipole magnets in many applications.

Bromberg, Leslie (Sharon, MA)

2003-09-16T23:59:59.000Z

58

Apparatus and method for reducing inductive coupling between levitation and drive coils within a magnetic propulsion system  

DOE Patents (OSTI)

An apparatus and method is disclosed for reducing inductive coupling between levitation and drive coils within a magnetic levitation system. A pole array has a magnetic field. A levitation coil is positioned so that in response to motion of the magnetic field of the pole array a current is induced in the levitation coil. A first drive coil having a magnetic field coupled to drive the pole array also has a magnetic flux which induces a parasitic current in the levitation coil. A second drive coil having a magnetic field is positioned to attenuate the parasitic current in the levitation coil by canceling the magnetic flux of the first drive coil which induces the parasitic current. Steps in the method include generating a magnetic field with a pole array for levitating an object; inducing current in a levitation coil in response to motion of the magnetic field of the pole array; generating a magnetic field with a first drive coil for propelling the object; and generating a magnetic field with a second drive coil for attenuating effects of the magnetic field of the first drive coil on the current in the levitation coil.

Post, Richard F. (Walnut Creek, CA)

2001-01-01T23:59:59.000Z

59

Apparatus for and method of operating a cylindrical pulsed induction mass launcher  

SciTech Connect

An electromagnetic cylindrical projectile mass launcher and a method of operation is provided which includes a cylindrical projectile having a conducting armature, a cylindrical barrel in which the armature is received, a plurality of electromagnetic drive coil stages, a plurality of pulse energy sources, and a pulsed power arrangement for generating magnetic pulses forming a pulsed magnetic wave along the length of the launcher barrel. The pulsed magnetic wave provides a propelling force on the projectile along the drive coil. The pulsed magnetic wave of the drive coil stages is advanced along the armature faster than the projectile to thereby generate an induced current wave in the armature. The pulsed generation of the magnetic wave minimizes electromagnetic heating of the projectile and provides for smooth acceleration of the projectile through the barrel of the launcher.

Cowan, Jr., Maynard (Albuquerque, NM); Duggin, Billy W. (Albuquerque, NM); Widner, Melvin M. (Albuquerque, NM)

1992-01-01T23:59:59.000Z

60

Induction Melting  

Science Conference Proceedings (OSTI)

...form part of a resonance circuit. In a series inverter, the capacitors are connected in series with the induction

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to obtain the most current and comprehensive results.


61

Method for exciting inductive-resistive loads with high and controllable direct current  

DOE Patents (OSTI)

Apparatus and method for transmitting dc power to a load circuit by applying a dc voltage from a standard waveform synthesizer to duration modulate a bipolar rectangular wave generator. As the amplitude of the dc voltage increases, the widths of the rectangular wave generator output pulses increase, and as the amplitude of the dc voltage decreases, the widths of the rectangular wave generator output pulses decrease. Thus, the waveform synthesizer selectively changes the durations of the rectangular wave generator bipolar output pulses so as to produce a rectangular wave ac carrier that is duration modulated in accordance with and in direct proportion to the voltage amplitude from the synthesizer. Thereupon, by transferring the carrier to the load circuit through an amplifier and a rectifier, the load current also corresponds directly to the voltage amplitude from the synthesizer. To this end, the rectified wave at less than 100% duty factor, amounts to a doubled frequency direct voltage pulse train for applying a direct current to the load, while the current ripple is minimized by a high L/R in the load circuit. In one embodiment, a power transmitting power amplifier means having a dc power supply is matched to the load circuit through a transformer for current magnification without sacrificing load current duration capability, while negative voltage and current feedback are provided in order to insure good output fidelity.

Hill, Jr., Homer M. (Princeton Junction, NJ)

1976-01-01T23:59:59.000Z

62

Excitation of sidebands due to nonlinear coupling between a VLF transmitter signal and a natural ELF emission  

SciTech Connect

Symmetric sidebands are observed in the ionosphere by the AUREOL 3 satellite when it passes at a height of 1,200 km above the VLF transmitter at the Komsomolsk-on-Amur Alpha station (50{degree}5 N, 135{degree} E, frequency 11.90 and 12.65 kHz). The sidebands are about 500 Hz off the carrier frequency of Alpha pulses. They are approximately 20 dB lower than the transmitter signal, and they appear only when ELF natural emission above the local proton gyrofrequency is observed. The data are presented and analyzed. The nonlinear coupling of the VLF transmitter signal to natural ELF emission is invoked to explain the symmetric sidebands. It is shown that the nonlinear current excited by the beats of VLF and ELF waves is strong enough to explain the sideband amplitude.

Sotnikov, V.I.; Fiala, V.; Lefeuvre, F.; Lagoutte, D. (Lab. de Physique et Chimie de l'Environnement, Orleans (France)); Mogilevsky, M. (Space Research Inst., Moscow (USSR))

1991-07-01T23:59:59.000Z

63

Coincident bursts of auroral kilometric radiation and VLF emissions associated with a type III solar radio noise event  

SciTech Connect

This paper examines an isolated magnetospheric VLF/radio noise event that is highly suggestive of the triggering of terrestrial auroral kilometric radiation (AKR) by solar type III radio emission and of a close relation between AKR and broadband hiss. The solar type III burst was measured on polar HF riometers and was coincident with local dayside VLF/LF noise emission bursts at South Pole station. It was also coincident with AKR bursts detected on the AMPTE/IRM satellite, at the same magnetic local time as South Pole. On the basis of the close association of AKR and VLF bursts, and from geometrical considerations relating to wave propagnation, it is likely that the AKR source was on the dayside and on field lines near South Pole station. The general level of geomagnetic activity was very low. However, an isolated magnetic impulse event (MIE) accompanied by a riometer absorption pulse was in progress when all of the VLF/radio noise bursts occurred. The very close association of the type III burst at HF with the AKR is consistent with external stimulation of the AKR, if a different, more immediate, triggering process than that implied by Calvert is invoked. It is suggested here that some of the HF solar radiant energy may decay into waves with frequencies comparable to those of the AKR by parametric excitation or some other process, thus providing the few background photons required for the generation of AKR by the Wu and Lee cyclotron maser instability. The AKR, perhaps by modifying the magnetospheric electron velocity distribution, might have produced the observed VLF emissions. Alternatively, the VLF emissions may have arisen from the same anisotropic and unstable electron distribution function responsible for the AKR. 41 refs., 5 figs.

Rosenberg, T.J.; Singh, S.; Wu, C.S. [Univ. of Maryland, College Park, MD (United States); LaBelle, J.; Treumann, R.A. [Max-Planck-Institut fuer Physik und Astrophysik, Garching bei Muechen (Germany); Inan, U.S. [Stanford Univ., Stanford, CA (United States); Lanzerotti, L.J. [AT& T Bell Laboratories, Murray Hill, NJ (United States)

1995-01-01T23:59:59.000Z

64

The use of subionospheric VLF/LF propagation for the study of lower ionospheric perturbations associated with earthquakes  

SciTech Connect

It is recently recognized that the ionosphere is very sensitive to seismic effects, and the detection of ionospheric perturbations associated with earthquakes (EQs), attracts a lot of attention as a very promising candidate for short-term EQ prediction. In this review we propose a possible use of VLF/LF (very low frequency (3-30 kHz)/low frequency (30-300 kHz)) radio sounding of seismo-ionospheric perturbations. We first present the first convincing evidence on the presence of ionospheric perturbations for the disastrous Kobe EQ in 1995. The significant shift in terminator times in the VLF/LF diurnal variation, is successfully interpreted in terms of lowering of the lower ionosphere prior to the EQ, which is the confirmation of seismo-ionospheric perturbations. In order to avoid the overlapping with my own previous reviews [1, 2], we try to present the latest results including the statistical evidence on the correlation between the VLF/LF propagation anomalies (ionospheric perturbations) and EQs (especially with large magnitude and with shallow depth), a case study on the Indonesia Sumatra EQ (wavelike structures in the VLF/LF data), medium-distance (6{approx}8 Mm) propagation anomalies, the fluctuation spectra of subionospheric VLF/LF data (atmospheric gravity waves effect, the effect of Earth's tides etc.), and the mechanism of lithosphere - atmosphere - ionosphere coupling. Finally, we indicate the present situation of this kind of VLF/LF activities going on in different parts of the globe and we suggest the importance of international collaboration in this seismo-electromagnetics study.

Hayakawa, M. [Advanced Wireless Communications Research Center and Research Station on Seismo Electromagnetics, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu Tokyo 182-8585 (Japan)

2010-10-20T23:59:59.000Z

65

Digital signal processing control of induction machine`s torque and stator flux utilizing the direct stator flux field orientation method  

SciTech Connect

This paper presents a review of the Direct Stator Flux Field Orientation control method. This method can be used to control an induction motor`s torque and flux directly and is the application of interest for this thesis. This control method is implemented without the traditional feedback loops and associated hardware. Predictions are made, by mathematical calculations, of the stator voltage vector. The voltage vector is determined twice a switching period. The switching period is fixed throughout the analysis. The three phase inverter duty cycle necessary to control the torque and flux of the induction machine is determined by the voltage space vector Pulse Width Modulation (PWM) technique. Transient performance of either the flux or torque requires an alternate modulation scheme which is also addressed in this thesis. A block diagram of this closed loop system is provided. 22 figs., 7 tabs.

Seiz, J.B.

1997-04-01T23:59:59.000Z

66

Subionospheric VLF imaging of lightning-induced electron precipitation from the magnetosphere  

SciTech Connect

High-resoluton measurements of subionospheric VLF signals at multiple sites are used as a new tool to assess the spatial distribution and occurrence of ionospheric disturbances associated with lightning-induced electron precipitation. Simultaneous observations in California, Saskatchewan, and Quebec of VLF signals from multiple sources allow the monitoring of event activity over a course grid covering the continental US. Association of the observed VLF signal perturbations with lightning is often made on the basis of time correlation with prominent radio atmospherics. Simultaneous observations of individual events on subionospheric paths that cross one another are used to locate the disturbed ionospheric region(s). Absence of perturbations on nearby paths permits assessment of the spatial exstent of the region with a varying degree of accuracy, depending on the distribution of signal paths. In one case distinctly different onset delays (with respect to causative discharges) consistent with predictions of whistler-particle scattering theory were found, and were interpreted as being due to two separate regions separated in L value by {approximately} 0.4 L being excited in individual events. Occurrence statistics over the course of October 1987 exhibit generally higher levels of activity at the lower-latitude end of the 2 {lt} L {lt} 4 range, although it is difficult to separately assess the role of the source ligntning distribution. Occurrence statistics of simultaneous events on crossing paths are consistent with the spatial extent of the disturbed ionospheric regions being less than a few hundred kilometers. The occurrence statistics also suggest that scattering from disturbances located at distances of {gt} 100 km off the great circle paths is not significant.

Inan, U.S.; Knifsend, F.A.; Oh, J. (Stanford Univ., CA (United States))

1990-10-01T23:59:59.000Z

67

Long-range detection of VLF radiation produced by heating the auroral electrojet  

SciTech Connect

This paper presents the first evidence of long-range detection (greater than 1000 km) of calibrated VLF signals resulting from the HF heating of the auroral electrojet, that is, signal detection at a point of direct 'line of sight' of the heated patch of ionosphere. The 'radial' as well as the'azimuthal' magnetic component of the signals are recorded; from their ratio, the waveguide mode polarization is obtained. Observed absolute magnetic field strengths and waveguide polarizations are found to be in line with the predictions of simple waveguide models. 17 refs.

Barr, R.; Stubbe, P.; Kopka, H. (Max-Planck-Institut fuer Aeronomie, Katlenburg-Lindau (Federal Republic of Germany))

1991-08-01T23:59:59.000Z

68

Numerical simulation of whistler-triggered VLF emissions observed in Antartica  

SciTech Connect

The authors have extracted from VLF databases from British Antarctica Survey data taken at Halley and Faraday stations, examples of whistler-triggered emissions (WTE). The WTE are relatively narrow band emissions triggered by natural background whistlers undergoing nonlinear wave particle interactions generally in the equatorial regions. They occur with either rising or falling frequency relative to the triggering waves. Using a Vlasov type code the authors are able to simulate the types of emissions which are observed. 24 refs., 8 figs., 3 tabs.

Nunn, D. [Southhampton Univ., Southhampton (United Kingdom); Smith, A.J. [British Antarctic Survey, Cambridge (United Kingdom)

1996-03-01T23:59:59.000Z

69

ELF/VLF emissions generated in the ionosphere by heating facilities - a new tool for ionospheric and magnetospheric research  

SciTech Connect

A brief summary of ELF/VLF generation experiments using the SURA heating facility is presented. The possibilities of applications of the measured ionospherically generated low frequency signal parameters for diagnosing the physical phenomena in the ionosphere and the magnetosphere are discussed.

Kotik, D.S. [Radiophysical Research Institute, Nizhny Novgorod (Russian Federation)

1994-12-01T23:59:59.000Z

70

Theoretical investigation of the coupling and propagation of ionospheric elf/vlf radiation into the earth-ionosphere waveguide  

SciTech Connect

This document describes a theoretical investigation of the propagation of extremely low frequency/very low frequency ELF/VLF, 1-5 kHz radiation from a source located in the D and lower E regions (60-85 km) of the ionosphere to a remote receiving site on the surface of the earth. It provides theoretical support for analyzing results of past experiments and planning future experiments to create an ELF/VLF communication system using high frequency heating modification of ionospheric currents. Analysis of the HF antenna array at the Arecibo Observatory determined that there was enough power in the sidelobes to modify the ionosphere, thereby creating an ELF/VLF source array. The ELF/VLF frequency response calculated for the ionospheric source array compared well with experimentally measured data. The coupling of radiation from ionospheric sources into the earth-ionosphere wave guide and the propagation of the radiation to receiving sites are investigated in detail using a model based on reciprocity.

Carroll, K.J.

1986-01-01T23:59:59.000Z

71

A BATSE investigation of radiation belt electrons precipitated by VLF waves. Final report  

SciTech Connect

The Compton Observatory commonly encounters fluxes of energetic electrons which have been scattered from the inner radiation belt to the path of the satellite by resonant interactions with VLF waves from powerful man-made transmitters. The present investigation was motivated by the fact that in the Fall of 1993, the Gamma Ray Observatory was boosted from a 650 km altitude circular orbit to a 750 km altitude circular orbit. This was an opportunity, for the first time, to make observations at two different altitudes using the same instrument. The authors have examined DISCLA data from the Burst & Transient Source Experiment (BATSE) experiment from 1 Sep. 1993 to 29 Jan. 1994. During the period of study they identified 48 instances of the satellite encountering a cloud of energetic electrons which had been scattered by VLF transmitters. They find that boosting the altitude of the circular orbit from 650 km to 750 km increased the intensity of cyclotron resonance scattered electrons by a factor of two. To search for long term changes in the cyclotron resonance precipitation, the authors have compared the approx. 750 km altitude data from 106 days at the end of 1993 with data at the same altitudes and time of year in 1991. The cyclotron resonance events in 1991 were three times more frequent and 25% of those cases were more intense than any seen in the 1993 data. They attribute this difference to increased level of geomagnetic activity in 1991 near the Solar Maximum.

Datlowe, D.W.

1995-04-01T23:59:59.000Z

72

Unmanned airborne vehicle (UAV): Flight testing and evaluation of two-channel E-field very low frequency (VLF) instrument  

SciTech Connect

Using VLF frequencies, transmitted by the Navy`s network, for airborne remote sensing of the earth`s electrical, magnetic characteristics was first considered by the United States Geological Survey (USGS) around the mid 1970s. The first VLF system was designed and developed by the USGS for installation and operation on a single engine, fixed wing aircraft used by the Branch of Geophysics for geophysical surveying. The system consisted of five channels. Two E-field channels with sensors consisting of a fixed vertical loaded dipole antenna with pre-amp mounted on top of the fuselage and a gyro stabilized horizontal loaded dipole antenna with pre-amp mounted on a tail boom. The three channel magnetic sensor consisted of three orthogonal coils mounted on the same gyro stabilized platform as the horizontal E-field antenna. The main features of the VLF receiver were: narrow band-width frequency selection using crystal filters, phase shifters for zeroing out system phase variances, phase-lock loops for generating real and quadrature gates, and synchronous detectors for generating real and quadrature outputs. In the mid 1990s the Branch of Geophysics designed and developed a two-channel E-field ground portable VLF system. The system was built using state-of-the-art circuit components and new concepts in circuit architecture. Small size, light weight, low power, durability, and reliability were key considerations in the design of the instrument. The primary purpose of the instrument was for collecting VLF data during ground surveys over small grid areas. Later the system was modified for installation on a Unmanned Airborne Vehicle (UAV). A series of three field trips were made to Easton, Maryland for testing and evaluating the system performance.

NONE

1998-12-01T23:59:59.000Z

73

Correlelations between the Anomalous Behaviour of the Ionosphere and the Seismic Events for VTX-MALDA VLF Propagation  

SciTech Connect

One of the most important application of the VLF signals is that it contains possible information about the lithosphere-ionosphere coupling. In other words, in near future, it may be possible to predict seismic events by judging signatures of VLF signals. In this paper, we present the result of the monitoring of the VLF signals collected in the Malda branch of ICSP, located in Malda, West Bengal, for four years (2005, 2007-09) and we try to find out the co-relations, if any, between the ionospheric activities and the earthquakes. Here we use that VLF signals which are transmitted from the VTX station (18.2 KHz), located near Vijayanarayanam in Tamilnadu, about 2290 km away from the receiver. To find out the co-relation of the ionospheric activities with the seismic events such as earthquake, first we have to study the average signal throughout the year. For this, we plot the so-called standardized calibration curve using the four years data. Here we use a total of 481 no. of data. To establish the co-relation between the ionospheric activities and the seismic events, we use the data of the year 2008 and we found that the deviations of the anomalous data are co-related with the seismic event. We found that the highest deviation takes place one day prior to the seismic events. We also calculated the 'D-layer preparation time'(DLPT) and the 'D-layer disappearance time'(DLDT) for the data of 2008 and tried to establish the co-relation between the anomalous DLPT and DLDT with the seismic events, if any. We compare our result with the VLF signals received from other places.

Ray, Suman; Sasmal, S. [Indian Centre for Space Physics, 43 Chalantika, Garia Station Road, Kolkata 700084 (India); Chakrabarti, S. K. [Indian Centre for Space Physics, 43 Chalantika, Garia Station Road, Kolkata 700084 (India); S. N. Bose National Centre for Basic Sciences, JD Block, Salt Lake, Kolkata 700098 (India); Choudhury, A. K. [Indian Centre for Space Physics, Malda Branch, Atul Market, Malda 731101 (India)

2010-10-20T23:59:59.000Z

74

Cone structure and focusing of VLF and LF electromagnetic waves at high altitudes in the ionosphere  

SciTech Connect

The frequency and angle dependencies of the electric field radiated by an electric dipole E = E[sub 0] cos [omega]t are studied through numerical calculations of [vert bar]E[vert bar] in the VLF and LF frequency bands 0.02f[sub b] [le] F [le] 0.5f[sub b] in a model ionosphere over an altitude region of 800-6000 km where the wave frequency and electron gyrofrequency varies between F [approximately]4 - 500 kHz and f[sub b] [approx equal] (1.1 to 0.2) MHz respectively. It is found that the amplitudes of the electric field have large maxima in four regions: close to the direction of the Earth magnetic field line B[sub 0] (it is called the axis field E[sub 0]), in the Storey E[sub St], reversed Storey E[sub RevSt], and resonance E[sub Res] cones. The maximal values of E[sub 0], E[sub Res], and E[sub RevSt] are the most pronounced close to the lower hybrid frequency, F [approximately] F[sub L]. The flux of the electric field is concentrated in very narrow regions, with the apex angles of the cones [delta][beta] [approx equal] (0.1-1) deg. The enhancement and focusing of the electric field increases with altitude starting at Z>800 km. At Z [ge] 1000 up to 6000 km, the relative value of [vert bar]E[vert bar], in comparison with its value at Z = 800 km is about (10[sup 2] to 10[sup 4]) times larger. Thus, the flux of VLF and LF electromagnetic waves generated at high altitudes in the Earth's ionosphere are trapped into very narrow conical beams similar to laser beams. 7 refs., 14 figs., 5 tabs.

Alpert, Ya.L. (Harvard Smithsonian Center for Astrophysics, Cambridge, MA (United States)); Green, J.L. (NASA/Goddard Space Flight Center, Greenbelt, MD (United States))

1994-01-01T23:59:59.000Z

75

Induction-based gate-level verification of multipliers  

Science Conference Proceedings (OSTI)

We propose a method based on unrolling the inductive definition of binary number multiplication to verify gate-level implementations of multipliers. The induction steps successively reduce the size of the multiplier under verification. Through induction, ...

Ying Tsai Chang; Kwang Ting Tim Cheng

2001-11-01T23:59:59.000Z

76

Three-dimensional modeling of subionospheric VLF propagation in the presence of localized D region perturbations associated with lightning  

SciTech Connect

A theoretical model of single-mode, subionospheric VLF wave propagation in the presence of localized perturbations of the nighttime D region has been developed. Such perturbations could be produced, for example, by lightning-induced electron precipitation associated with a characteristic type of phase or amplitude perturbation in VLF signals known as Trimpi events. The model assumes that the ionospheric perturbation is slowly varying in the horizontal plane and that mode-coupling is therefore negligible, and accounts for (1) effects of perturbations with finite extent in the dimension transverse to the great circle (GC) path between transmitter and receiver, and (2) effects of perturbations which lie off the GC path as well as on it. The formulation used for the numerical calculations depends significantly on the mode refractive index of the ambient Earth-ionosphere waveguide and the mode refractive index in the region of the perturbation. In the calculations values for the mode refractive index are determined from the electron-density-versus-altitude profiles of both the ambient and perturbed ionospheres. Values for changes in the amplitude and phase of a received signal were obtained from the model and compared with amplitude and phase measurements of a VLF signal received at Palmer Station, Antarctica, from the NPM transmitter (23.4 kHz) in Hawaii during energetic electron precipitation events.

Poulsen, W.L.; Bell, T.F.; Inan, U.S. (Stanford Univ., CA (United States))

1990-03-01T23:59:59.000Z

77

Induction machine  

DOE Patents (OSTI)

A polyphase rotary induction machine for use as a motor or generator utilizing a single rotor assembly having two series connected sets of rotor windings, a first stator winding disposed around the first rotor winding and means for controlling the current induced in one set of the rotor windings compared to the current induced in the other set of the rotor windings. The rotor windings may be wound rotor windings or squirrel cage windings.

Owen, Whitney H. (Ogden, UT)

1980-01-01T23:59:59.000Z

78

Monitoring transients in low inductance circuits  

DOE Patents (OSTI)

The instant invention relates to methods of and apparatus for monitoring transients in low inductance circuits and to a probe utilized to practice said method and apparatus. More particularly, the instant invention relates to methods of and apparatus for monitoring low inductance circuits, wherein the low inductance circuits include a pair of flat cable transmission lines. The instant invention is further directed to a probe for use in monitoring pairs of flat cable transmission lines.

Guilford, R.P.; Rosborough, J.R.

1985-10-21T23:59:59.000Z

79

A BATSE investigation of radiation belt electrons precipitated by VLF waves. Final report, 2 May 1994-24 April 1995  

SciTech Connect

The Compton Observatory commonly encounters fluxes of energetic electrons which have been scattered from the inner radiation belt to the path of the satellite by resonant interactions with VLF waves from powerful man-made transmitters. The present investigation was motivated by the fact that in the Fall of 1993, the Gamma Ray Observatory was boosted from a 650 km altitude circular orbit to a 750 km altitude circular orbit. This was an opportunity, for the first time, to make observations at two different altitudes using the same instrument. The authors have examined DISCLA data from the Burst & Transient Source Experiment (BATSE) experiment from 1 Sep. 1993 to 29 Jan. 1994. During the period of study they identified 48 instances of the satellite encountering a cloud of energetic electrons which had been scattered by VLF transmitters. They find that boosting the altitude of the circular orbit from 650 km to 750 km increased the intensity of cyclotron resonance scattered electrons by a factor of two. To search for long term changes in the cyclotron resonance precipitation, the authors have compared the approx. 750 km altitude data from 106 days at the end of 1993 with data at the same altitudes and time of year in 1991. The cyclotron resonance events in 1991 were three times more frequent and 25% of those cases were more intense than any seen in the 1993 data. The authors attribute this difference to increased level of geomagnetic activity in 1991 near the Solar Maximum.

Datlowe, D.W.

1995-05-01T23:59:59.000Z

80

Generation of ELF and VLF waves by HF-modulated polar electrojet via a thermal instability process  

SciTech Connect

Generation of ELF and VLF waves via a thermal instability process in a HF-modulated polar electrojet has been investigated. It is shown that a positive feedback through the electron-neutral collisional heating process can cause the transient response of the plasma to the modulated HF heater to grow exponentially. The threshold fields of the instability under normal electrojet conditions are found to be about 2.25 V/m and 1.13 V/m for the operation of the o-mode and x-mode heaters with a 50% duty cycle, respectively. For a heater wave field of, e.g., 1.5 V/m, the instability can be excited by the x-mode heater within a few tens of millisecond. The predicted dependence of the ELF/VLF radiation amplitude on the percentage of the duty cycle of the HF modulation is identical to that of the recent observational results of Barr and Stubbe. 28 refs., 2 figs.

Kuo, S.P. (Polytechnic Univ., Farmingdale, NY (United States)); Lee, M.C. (Massachusetts Inst. of Technology, Cambridge (United States))

1993-02-05T23:59:59.000Z

Note: This page contains sample records for the topic "vlf induction method" from the National Library of EnergyBeta (NLEBeta).
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81

Direction finding of half-gyrofrequency VLF emissions in the off-equatorial region of the magnetosphere and their generation and propagation  

SciTech Connect

The spectra of VLF/ELF emissions in the off-equatorial region in the outer magnetosphere are, on occasion, found to consist of upper and lower bands with a frequency gap between them. The wave normal directions of the upper band VLF emissions have been determined by means of wave distribution function analyses based first on the measurement of three magnetic field components only, and then with the additional use of an electric field component. It is found that the wave distribution functions are composed of two peaks whose central wave normal angles {theta} with respect to the magnetic field at a geomagnetic latitude of {approximately} 17{degree} are close to the local oblique resonance cone {theta}{sub res} but whose values of {theta} are always about 15{degree}-20{degree} less than {theta}{sub res} at a higher latitude of {approximately}26{degree}. This observed wave normal behavior is compared with the theoretical prediction from direct ray tracing studies using the hypothesis deduced from a previous investigation that the waves are generated at the equator with wave normals close to {theta}{sub res}. A combination of this comparison and inverse ray tracing in which the initial wave normal directions are those determined from the wave distribution analysis has yielded the results that the {theta} values of the upper band VLF emissions are very close to {theta}{sub res} at the equator and that the normalized frequency there, {Lambda}{sub eq}, is above 0.5. Hence the upper band VLF emissions are identified as being half-gyrofrequency VLF emissions generated in the vicinity of the magnetic equator, with their wave normals close to {theta}{sub res}. The characteristics of propagation between the equatorial source region and the observing positions have been investigated by direct ray tracing. The generation mechanism is also discussed.

Muto, H.; Hayakawa, M. (Nagoya Univ., Aichi (Japan)); Parrot, M.; Lefeuvre, F. (Centre National de la Recherche Scientifique, Orleans (France))

1987-07-01T23:59:59.000Z

82

Inductively coupled plasma spectrometry: Noise characteristics of aerosols, application of generalized standard additions method, and Mach disk as an emission source  

SciTech Connect

This dissertation is focused on three problem areas in the performance of inductively coupled plasma (ICP) source. The noise characteristics of aerosols produced by ICP nebulizers are investigated. A laser beam is scattered by aerosol and detected by a photomultiplier tube and the noise amplitude spectrum of the scattered radiation is measured by a spectrum analyzer. Discrete frequency noise in the aerosol generated by a Meinhard nebulizer or a direct injection nebulizer is primarily caused by pulsation in the liquid flow from the pump. A Scott-type spray chamber suppresses white noise, while a conical, straight-pass spray chamber enhances white noise, relative to the noise seen from the primary aerosol. Simultaneous correction for both spectral interferences and matrix effects in ICP atomic emission spectrometry (AES) can be accomplished by using the generalized standard additions method (GSAM). Results obtained with the application of the GSAM to the Perkin-Elmer Optima 3000 ICP atomic emission spectrometer are presented. The echelle-based polychromator with segmented-array charge-coupled device detectors enables the direct, visual examination of the overlapping lines Cd (1) 228.802 nm and As (1) 228.812 nm. The slit translation capability allows a large number of data points to be sampled, therefore, the advantage of noise averaging is gained. An ICP is extracted into a small quartz vacuum chamber through a sampling orifice in a water-cooled copper plate. Optical emission from the Mach disk region is measured with a new type of echelle spectrometer equipped with two segmented-array charge-coupled-device detectors, with an effort to improve the detection limits for simultaneous multielement analysis by ICP-AES.

Shen, Luan

1995-10-06T23:59:59.000Z

83

Excitation of guided ELF-VLF waves through modification of the F{sub 2} ionospheric layer by high-power radio waves  

SciTech Connect

The possibility of controlled excitation of ELF-VLF electromagnetic waves through modification of the F{sub 2} ionospheric layer by high-power high-frequency emission is demonstrated in a natural experiment by using the Sura midlatitude heating facility. The excited low-frequency waves can be used to explore the near-Earth space and stimulate the excitation of a magnetospheric maser.

Markov, G. A.; Belov, A. S.; Komrakov, G. P. [Lobachevsky State University (Russian Federation); Parrot, M. [Environmental Physics and Chemistry Laboratory (France)

2012-03-15T23:59:59.000Z

84

Frequency variations of quasi-periodic ELF-VLF emissions: A possible new ground-based diagnostic of the outer high-latitude magnetosphere  

SciTech Connect

Magnetic pulsations and quasi-periodic (QP) amplitude modulations of ELF-VLF waves at Pc 3-4 frequencies (15-50 mHz) are commonly observed simultaneously in cusp-latitude data. The naturally occurring ELF-VLF emissions are believed to be modulated within the magnetosphere by the compressional component of geomagnetic pulsations formed external to the magnetosphere. The authors have examined data from South Pole Station (L {approximately} 14) to determine the occurrence and characteristics of QP emissions. On the basis of 14 months of data during 1987 and 1988 they found that QP emissions typically appeared in both the 0.5-1 kHz and 1-2 kHz receiver channels at South Pole Station and ocassionally in the 2-4 kHz channel. The QP emission frequency appeared to depend on solar wind parameters and interplanetary magnetic field (IMF) direction, and the months near fall equinox in both 1987 and 1988 showed a significant increase in the percentage of QP emissions only in the lowest-frequency channel. The authors present a model consistent with these variations in which high-latitude (nonequatorial) magnetic field minima near the magnetopause play a major role, because the field magnitude governs both the frequency of ELF-VLF emissions and the whistler mode propagation cutoffs. Because the field in these regions will be strongly influenced by solar wind and IMF parameters, variations in the frequency of such emissions may be useful in providing ground-based diagnostics of the outer high-latitude magnetosphere. 32 refs., 13 figs.

Alford, J.; Engebretson, M. [Ausburg College, Minneapolis, MN (United States); Arnoldy, R. [Univ. of New Hampshire, Durham, NH (United States); Inan, U. [Stanford Univ., CA (United States)

1996-01-01T23:59:59.000Z

85

Linear induction accelerator  

DOE Patents (OSTI)

A linear induction accelerator includes a plurality of adder cavities arranged in a series and provided in a structure which is evacuated so that a vacuum inductance is provided between each adder cavity and the structure. An energy storage system for the adder cavities includes a pulsed current source and a respective plurality of bipolar converting networks connected thereto. The bipolar high-voltage, high-repetition-rate square pulse train sets and resets the cavities. 4 figs.

Buttram, M.T.; Ginn, J.W.

1988-06-21T23:59:59.000Z

86

A multiple-mode three-dimensional model of VLF propagation in the earth-ionosphere waveguide in the presence of localized D region disturbances  

SciTech Connect

Transient localized D region disturbances, such as those associated with lightning discharges, affect the characteristics of VLF waves propagating in the Earth-ionosphere waveguide. In particular, both phase and amplitude changes in the subionospheric signal can be observed at receiving sites as a result of the wave scattering that takes place in the disturbed region. In the present paper we present a multiple-mode three- dimensional model of VLF propagation in the Earth-ionosphere waveguide in the presence of localized D region disturbances. The model takes into account great circle (GC) propagation paths with realistic ground and ionospheric conductivity changes that result in mode conversion along the path. It is assumed that conductivity changes transverse to the GC paths are negligible except in the vicinity of the D region disturbance and that mode coupling is negligible within the distributed region. This new model is applied to experimental observations and is found to be in general agreement. The diagnostics potential of the model for characterizing energetic particle precipitation events is discussed. 33 refs., 14 figs.

Poulsen, W.L.; Inan, U.S.; Bell, T.F. (Stanford Univ., CA (United States))

1993-02-01T23:59:59.000Z

87

Steady-state inductive spheromak operation  

DOE Patents (OSTI)

The inductively formed spheromak configuration (S-1) can be maintained in a highly stable and controlled fashion. The method described eliminates the restriction to pulsed spheromak plasmas or the use of electrodes for steady-state operation, and, therefore, is a reactor-relevant formation and sustainment method.

Janos, A.C.; Jardin, S.C.; Yamada, M.

1985-02-20T23:59:59.000Z

88

Thunderstorm Electrification—Inductive or Non-Inductive?  

Science Conference Proceedings (OSTI)

Most of the precipitation related theories on charge generation in thunderstorms fall into one of two categories: the inductive or polarization mechanism initiated by the ambient fair-weather field, and the non-inductive mechanism connected with ...

Joachim P. Kuettner; J. Doyne Sartor; Zev Levin

1981-11-01T23:59:59.000Z

89

Standard test method for determination of impurities in plutonium: acid dissolution, ion exchange matrix separation, and inductively coupled plasma-atomic emission spectroscopic (ICP/AES) analysis  

E-Print Network (OSTI)

1.1 This specification covers blended uranium trioxide (UO3), U3O8, or mixtures of the two, powders that are intended for conversion into a sinterable uranium dioxide (UO2) powder by means of a direct reduction process. The UO2 powder product of the reduction process must meet the requirements of Specification C 753 and be suitable for subsequent UO2 pellet fabrication by pressing and sintering methods. This specification applies to uranium oxides with a 235U enrichment less than 5 %. 1.2 This specification includes chemical, physical, and test method requirements for uranium oxide powders as they relate to the suitability of the powder for storage, transportation, and direct reduction to UO2 powder. This specification is applicable to uranium oxide powders for such use from any source. 1.3 The scope of this specification does not comprehensively cover all provisions for preventing criticality accidents, for health and safety, or for shipping. Observance of this specification does not relieve the user of th...

American Society for Testing and Materials. Philadelphia

2003-01-01T23:59:59.000Z

90

Power and Voltage Smooth Control of Doubly Fed Induction Generator  

Science Conference Proceedings (OSTI)

Doubly-fed induction generator (DFIG) is the leading in wind power technology currently. In this paper, decoupling control of DFIG is studied and a new energy storage device is used in the smooth control of DFIG system's power and voltage. This new method ... Keywords: Doubly fed induction generator, Energy storage device, Decoupling control

An-Ren Ma, Cai-Xia Wang, Zhi-Wen Zhou, Tao Wu

2012-07-01T23:59:59.000Z

91

Induction plasma tube  

DOE Patents (OSTI)

An induction plasma tube having a segmented, fluid-cooled internal radiation shield is disclosed. The individual segments are thick in cross-section such that the shield occupies a substantial fraction of the internal volume of the plasma enclosure, resulting in improved performance and higher sustainable plasma temperatures. The individual segments of the shield are preferably cooled by means of a counterflow fluid cooling system wherein each segment includes a central bore and a fluid supply tube extending into the bore. The counterflow cooling system results in improved cooling of the individual segments and also permits use of relatively larger shield segments which permit improved electromagnetic coupling between the induction coil and a plasma located inside the shield. Four embodiments of the invention, each having particular advantages, are disclosed.

Hull, D.E.

1982-07-02T23:59:59.000Z

92

Induction plasma tube  

DOE Patents (OSTI)

An induction plasma tube having a segmented, fluid-cooled internal radiation shield is disclosed. The individual segments are thick in cross-section such that the shield occupies a substantial fraction of the internal volume of the plasma enclosure, resulting in improved performance and higher sustainable plasma temperatures. The individual segments of the shield are preferably cooled by means of a counterflow fluid cooling system wherein each segment includes a central bore and a fluid supply tube extending into the bore. The counterflow cooling system results in improved cooling of the individual segments and also permits use of relatively larger shield segments which permit improved electromagnetic coupling between the induction coil and a plasma located inside the shield. Four embodiments of the invention, each having particular advantages, are disclosed.

Hull, Donald E. (Los Alamos, NM)

1984-01-01T23:59:59.000Z

93

Compton Gamma Ray Observatory/BATSE observations of energetic electrons scattered by cyclotron resonance with waves from powerful VLF transmitters. Final report, 13 October 1992-12 February 1994  

SciTech Connect

To obtain a better understanding of the wave-particle mechanisms responsible for the loss of electrons from the radiation belts, energetic electron data from the Burst and Transient Source Experiment (BATSE) on the NASA's Compton Gamma Ray Observatory (GRO) was studied. Powerful ground-based VLF transmitters resonantly scatter electrons from the inner radiation belt onto trajectories from which they precipitate into the atmosphere as they drift eastward. 563 instances in which the satellite traversed a cloud of energetic electrons which had been scattered into quasi-trapped trajectories were identified. From the longitude distribution, it was concluded that waves from the VLF transmitter NWC at 114 deg E are the origin of 257 of the events, and waves from UMSat 44 deg E related to 45 more. In another 177 cases the electrons had drifted from the longitude of these transmitters to a location in the western hemisphere. The previously reported seasonal variation in the frequency of occurrence of cyclotron resonance interaction is confirmed with the continuous coverage provided by GRO. The frequency of occurrence of the cyclotron resonance interactions is largest before sunrise, which the authors attribute to the diurnal variations in the transmission VLF waves through the ionosphere. For the first time, unique very narrow sheets of electrons occurring in the aftermath of a large geomagnetic storm are reported.

Datlowe, D.W.; Imhof, W.L.

1994-02-01T23:59:59.000Z

94

Induction Linac Pulsers  

DOE Green Energy (OSTI)

The pulsers used in most of the induction linacs evolved from the very large body of work that was done in the U.S. and Great Britain during the development of the pulsed magnetron for radar. The radar modulators started at {approx}100 kW and reached >10 MW by 1945. A typical pulse length was 1 {mu}s at a repetition rate of 1,000 pps. A very comprehensive account of the modulator development is Pulse Generators by Lebacqz and Glasoe, one of the Radiation Laboratory Series. There are many permutations of possible modulators, two of the choices being tube type and line type. In earlier notes I wrote that technically the vacuum tube pulser met all of our induction linac needs, in the sense that a number of tubes, in series and parallel if required, could produce our pulses, regulate their voltage, be useable in feed-forward correctors, and provide a low source impedance. At a lower speed, an FET array is similar, and we have obtained and tested a large array capable of >10 MW switching. A modulator with an electronically controlled output only needs a capacitor for energy storage and in a switched mode can transfer the energy from the capacitor to the load at high efficiency. Driving a full size Astron induction core and a simulated resistive 'beam load' we achieved >50% efficiency. These electronically controlled output pulses can produce the pulses we desire but are not used because of their high cost. The second choice, the line type pulser, visually comprises a closing switch and a distributed or a lumped element transmission line. The typical switch cannot open or stop conducting after the desired pulse has been produced, and consequently all of the initially stored energy is dissipated. This approximately halves the efficiency, and the original cost estimating program LIACEP used this factor of two, even though our circuits are usually worse, and even though our inveterate optimists often omit it. The 'missing' energy is that which is reflected back into the line from mismatches, the energy left in the accelerator module's capacitance, the energy lost in the switch during switching and during the pulse, and the energy lost in the pulse line charging circuit. For example, a simple resistor-limited power supply dissipates as much energy as it delivers to the pulse forming line, giving a factor if two by itself, therefore efficiency requires a more complicated charging system.

Faltens, Andris

2011-01-07T23:59:59.000Z

95

Borehole induction coil transmitter  

DOE Patents (OSTI)

A borehole induction coil transmitter which is a part of a cross-borehole electromagnetic field system that is used for underground imaging applications. The transmitter consists of four major parts: 1) a wound ferrite or mu-metal core, 2) an array of tuning capacitors, 3) a current driver circuit board, and 4) a flux monitor. The core is wound with several hundred turns of wire and connected in series with the capacitor array, to produce a tuned coil. This tuned coil uses internal circuitry to generate sinusoidal signals that are transmitted through the earth to a receiver coil in another borehole. The transmitter can operate at frequencies from 1-200 kHz and supplies sufficient power to permit the field system to operate in boreholes separated by up to 400 meters.

Holladay, Gale (Livermore, CA); Wilt, Michael J. (Walnut Creek, CA)

2002-01-01T23:59:59.000Z

96

Inductive.PDF  

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

EV- EV- -INDUCTIVE Panasonic NiMH Battery ELECTRIC TRANSPORTATION DIVISION Ricardo Solares Juan Argueta October 1999 2 DISCLAIMER OF WARRANTIES AND LIMITATION OF LIABILITIES THIS REPORT WAS PREPARED BY THE ELECTRIC TRANSPORTATION DIVISION OF SOUTHERN CALIFORNIA EDISON, A SUBSIDIARY OF EDISON INTERNATIONAL. NEITHER THE ELECTRIC TRANSPORTATION DIVISION OF SOUTHERN CALIFORNIA EDISON, SOUTHERN CALIFORNIA EDISON, EDISON INTERNATIONAL, NOR ANY PERSON WORKING FOR OR ON BEHALF OF ANY OF THEM MAKES ANY WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, (I) WITH RESPECT TO THE USE OF ANY INFORMATION, PRODUCT, PROCESS OR PROCEDURE DISCUSSED IN THIS REPORT, INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, OR (II) THAT SUCH USE DOES NOT INFRINGE UPON OR INTERFERE WITH RIGHTS OF

97

Induction of robust classifiers for web ontologies through kernel machines  

Science Conference Proceedings (OSTI)

The paper focuses on the task of approximate classification of semantically annotated individual resources in ontological knowledge bases. The method is based on classification models built through kernel methods, a well-known class of effective statistical ... Keywords: Individual classification, Inductive reasoning, Kernel methods, Ontology mining, Similarity, Support vector machines

Nicola Fanizzi; Claudia d'Amato; Floriana Esposito

2012-03-01T23:59:59.000Z

98

Linear induction pump  

DOE Patents (OSTI)

Electromagnetic linear induction pump for liquid metal which includes a unitary pump duct. The duct comprises two substantially flat parallel spaced-apart wall members, one being located above the other and two parallel opposing side members interconnecting the wall members. Located within the duct are a plurality of web members interconnecting the wall members and extending parallel to the side members whereby the wall members, side members and web members define a plurality of fluid passageways, each of the fluid passageways having substantially the same cross-sectional flow area. Attached to an outer surface of each side member is an electrically conductive end bar for the passage of an induced current therethrough. A multi-phase, electrical stator is located adjacent each of the wall members. The duct, stators, and end bars are enclosed in a housing which is provided with an inlet and outlet in fluid communication with opposite ends of the fluid passageways in the pump duct. In accordance with a preferred embodiment, the inlet and outlet includes a transition means which provides for a transition from a round cross-sectional flow path to a substantially rectangular cross-sectional flow path defined by the pump duct.

Meisner, John W. (Newbury Park, CA); Moore, Robert M. (Canoga Park, CA); Bienvenue, Louis L. (Chatsworth, CA)

1985-03-19T23:59:59.000Z

99

Capacitively-coupled inductive sensor  

DOE Patents (OSTI)

It is therefore an object of the present invention to provide a capacitively-coupled inductive shunt current sensor. To achieve the other object, and in accordance with the purpose of the present invention, as embodied and broadly described herein, the apparatus of this invention may comprise a capacitively coupled inductive shunt current sensor comprising: annular inductive channel means formed in a conductor carrying a high voltage pulsed current; an electrode capacitively coupled to said conductor on opposite sides of said annular inductive channel means; voltage dividing capacitor means connected in series with said electrode for reducing the magnitude of the detected output signal; output coupling means connected to said voltage dividing capacitor means for producing an output signal representative of said high voltage pulsed current.

Ekdahl, C.A.

1981-04-13T23:59:59.000Z

100

Modeling Stem Cell Induction Processes  

E-Print Network (OSTI)

Technology for converting human cells to pluripotent stem cell using induction processes has the potential to revolutionize regenerative medicine. However, the production of these so called iPS cells is still quite inefficient ...

Grácio, Filipe

Note: This page contains sample records for the topic "vlf induction method" 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

The Observational?Inductive Framework for Science  

Science Conference Proceedings (OSTI)

A new observational?inductive framework for science is emerging due to recent developments in sensors

Timothy E. Eastman

2006-01-01T23:59:59.000Z

102

Method  

E-Print Network (OSTI)

Abstract: The biodegradabilities of poly(butylene succinate) (PBS) powders in a controlled compost at 58 °C have been studied using a Microbial Oxidative Degradation Analyzer (MODA) based on the ISO 14855-2 method, entitled “Determination of the ultimate aerobic biodegradability of plastic materials under controlled composting conditions—Method by analysis of evolved carbon dioxide—Part 2: Gravimetric measurement of carbon dioxide evolved in a laboratory-scale test”. The evolved CO2 was trapped by an additional aqueous Ba(OH)2 solution. The trapped BaCO3 was transformed into graphite via a serial vaporization and reduction reaction using a gas-tight tube and vacuum manifold system. This graphite was analyzed by accelerated mass spectrometry (AMS) to determine the percent modern carbon [pMC (sample)] based on the 14 C radiocarbon concentration. By using the theory that pMC (sample) was the sum of the pMC (compost) (109.87%) and pMC (PBS) (0%) as the respective ratio in the determined period, the CO2 (respiration) was calculated from only one reaction vessel. It was found that the biodegradabilities determined by the CO2 amount from PBS in the sample vessel were about 30 % lower than those based on the ISO method. These differences between the

Masao Kunioka; Fumi Ninomiya; Masahiro Funabashi

2009-01-01T23:59:59.000Z

103

Capacitively-coupled inductive sensor  

DOE Patents (OSTI)

A capacitively coupled inductive shunt current sensor which utilizes capacitive coupling between flanges having an annular inductive channel formed therein. A voltage dividing capacitor is connected between the coupling capacitor and ground to provide immediate capacitive division of the output signal so as to provide a high frequency response of the current pulse to be detected. The present invention can be used in any desired outer conductor such as the outer conductor of a coaxial transmission line, the outer conductor of an electron beam transmission line, etc.

Ekdahl, Carl A. (Albuquerque, NM)

1984-01-01T23:59:59.000Z

104

Closed inductively coupled plasma cell  

DOE Patents (OSTI)

A closed inductively coupled plasma cell generates a relatively high power, low noise plasma for use in spectroscopic studies is disclosed. A variety of gases can be selected to form the plasma to minimize spectroscopic interference and to provide a electron density and temperature range for the sample to be analyzed. Grounded conductors are placed at the tube ends and axially displaced from the inductive coil, whereby the resulting electromagnetic field acts to elongate the plasma in the tube. Sample materials can be injected in the plasma to be excited for spectroscopy. 1 fig.

Manning, T.J.; Palmer, B.A.; Hof, D.E.

1990-11-06T23:59:59.000Z

105

Simulation-assisted inductive learning  

Science Conference Proceedings (OSTI)

Learning by induction can require a large number of training examples. We show the power of using a simulator to generate training data and test data in learning rules for an expert system. The induction program is RL, a simplified version of Meta-DENDRAL. The expert system is ABLE, a rule-based system that identifies and located errors in particle beam lines used in high energy physics. A simulator of beam lines allowed forming and testing rules on sufficient numbers of cases that ABLE's performance is demonstrably accurate and precise. 13 refs., 2 figs.

Buchanan, B.G.; Sullivan, J.; Cheng, Tze-Pin; Clearwater, S.H.

1988-01-01T23:59:59.000Z

106

Integrating inductive definitions in SAT  

Science Conference Proceedings (OSTI)

We investigate techniques for supporting inductive definitions (IDs) in SAT, and report on an implementation, called MidL, of the resulting solver. This solver was first introduced in [11], as a part of a declarative problem solving framework. We go ...

Maarten Mariën; Johan Wittocx; Marc Denecker

2007-10-01T23:59:59.000Z

107

Induction Heat-Treating Equipment  

Science Conference Proceedings (OSTI)

Table 1   Characteristics of the four major power sources for induction heating...state 180 Hz to 50 kHz 1 kW to 2 MW 75â??95 No standby current; high efficiency; no moving parts;

108

THE INDUCTION PERIOD IN PHOTOSYNTHESIS  

E-Print Network (OSTI)

When a plant is illuminated, its rate of photosynthesis is at first low and gradually increases until it becomes constant. This induction period was first observed by Osterhout and Haas (1918) for UIva and independently confirmed by Warburg (1920) with Chlorella. It has

L. Smith

1937-01-01T23:59:59.000Z

109

Classification of Multivariate Time Series and Structured Data Using Constructive Induction  

Science Conference Proceedings (OSTI)

We present a method of constructive induction aimed at learning tasks involving multivariate time series data. Using metafeatures, the scope of attribute-value learning is expanded to domains with instances that have some kind of recurring substructure, ... Keywords: constructive induction, propositionalisation, substructure, time series

Mohammed Waleed Kadous; Claude Sammut

2005-02-01T23:59:59.000Z

110

METHOD  

E-Print Network (OSTI)

Environmental Management, Inc. It has been subject to the Agency’s peer and administrative review, and it has been approved for publication as an EPA document. The opinions, findings, and conclusions expressed herein are those of the contractor and not necessarily those of the EPA or other cooperating agencies. Mention of company or product names is not to be construed as an endorsement by the agency. Foreword The U.S. Environmental Protection Agency is charged by Congress with protecting the Nation’s land, air, and water resources. Under a mandate of national environmental laws, the Agency strives to formulate and implement actions leading to a compatible balance between human activities and the ability of natural systems to support and nurture life. To meet this mandate, EPA’s research program is providing data and technical support for solving environmental problems today and building a science knowledge base necessary to manage our ecological resources wisely, understand how pollutants affect our health, and prevent or reduce environmental risks in the future. The National Risk Management Research Laboratory is the Agency’s center for investigation of technological and management approaches for reducing risks from threats to human health and the environment. The focus of the Laboratory’s research program is on methods for the prevention and control of pollution to air, land, water and subsurface resources; protection of water quality in public water systems; remediation of contaminated sites and ground water; and prevention and control of indoor air pollution. The goal of this research effort is to catalyze development and implementation of innovative, cost-effective environmental technologies;

unknown authors

1995-01-01T23:59:59.000Z

111

Accelerating improvement of fuzzy rules induction with artificial immune systems  

Science Conference Proceedings (OSTI)

The paper introduces an algorithmic improvement to IFRAIS, an existing Artificial Immune System method for fuzzy rule mining. The improvement presented consists of using rule buffering during the computation of fitness of rules. This is achieved using ... Keywords: artificial immune system, data mining, fuzzy rules induction

Edward Mezyk; Olgierd Unold

2008-10-01T23:59:59.000Z

112

Mapping clay content variation using electromagnetic induction techniques  

Science Conference Proceedings (OSTI)

Effective management of the soil resource requires basic information about the spatial distribution of various attributes. A method widely used for providing spatial information is a combination of sampling strategies and geostatistics. However, geostatistical ... Keywords: EM34, EM38, Electromagnetic induction, Fuzzy k-means and extragrades classification, Spatial response surface sampling

J. Triantafilis; S. M. Lesch

2005-03-01T23:59:59.000Z

113

Positive mood induction and well being  

Science Conference Proceedings (OSTI)

The aim of this study is to test the role of consecutive positive mood induction virtual procedures on satisfaction of life of people with subclinical levels of sadness and/or anxiety. This is a work in progress and positive effects of mood induction ... Keywords: mood induction procedures, positive emotions, positive psychology, virtual reality

R. Baños; G. García-Soriano; C. Botella; E. Oliver; E. Etchemendy; J. Bretón; M. Alcañiz

2009-05-01T23:59:59.000Z

114

Automatic Bias Learning: An Inquiry into the Inductive Basis of Induction  

E-Print Network (OSTI)

This thesis combines an epistemological concern about induction with a computational exploration of inductive mechanisms. It aims to investigate how inductive performance could be improved by using induction to select appropriate generalisation procedures. The thesis revolves around a meta-learning system, called designed to investigate how inductive performances could be improved by using induction to select appropriate generalisation procedures. The performance of is discussed against the background of epistemological issues concerning induction, such as the role of theoretical vocabularies and the value of simplicity.

Hilan Bensusan; Murali Ramach; Fab Retkowsky; Pablito Romero; Margarita Sordo; Chris Thornton; David Weir

1999-01-01T23:59:59.000Z

115

Segmented rail linear induction motor  

DOE Patents (OSTI)

A segmented rail linear induction motor has a segmented rail consisting of a plurality of nonferrous electrically conductive segments aligned along a guideway. The motor further includes a carriage including at least one pair of opposed coils fastened to the carriage for moving the carriage. A power source applies an electric current to the coils to induce currents in the conductive surfaces to repel the coils from adjacent edges of the conductive surfaces.

Cowan, Jr., Maynard (1107 Stagecoach Rd. SE., Albuquerque, NM 87123); Marder, Barry M. (1412 Pinnacle View Dr. NE., Albuquerque, NM 87123)

1996-01-01T23:59:59.000Z

116

Segmented rail linear induction motor  

DOE Patents (OSTI)

A segmented rail linear induction motor has a segmented rail consisting of a plurality of nonferrous electrically conductive segments aligned along a guideway. The motor further includes a carriage including at least one pair of opposed coils fastened to the carriage for moving the carriage. A power source applies an electric current to the coils to induce currents in the conductive surfaces to repel the coils from adjacent edges of the conductive surfaces. 6 figs.

Cowan, M. Jr.; Marder, B.M.

1996-09-03T23:59:59.000Z

117

AOCS Official Method Ca 20-99  

Science Conference Proceedings (OSTI)

Analysis for Phosphorus in Oil by Inductively Coupled Plasma Optical Emission Spectroscopy AOCS Official Method Ca 20-99 Methods Methods and Analyses Analytical Chemistry Methods Downloads Methods Downloads DEFINITION ...

118

VAPOR SHIELD FOR INDUCTION FURNACE  

DOE Patents (OSTI)

This patent relates to a water-cooled vapor shield for an inductlon furnace that will condense metallic vapors arising from the crucible and thus prevent their condensation on or near the induction coils, thereby eliminating possible corrosion or shorting out of the coils. This is accomplished by placing, about the top, of the crucible a disk, apron, and cooling jacket that separates the area of the coils from the interior of the cruclbIe and provides a cooled surface upon whlch the vapors may condense.

Reese, S.L.; Samoriga, S.A.

1958-03-11T23:59:59.000Z

119

Induction slag reduction process for making titanium  

DOE Patents (OSTI)

Continuous process for preparing titanium comprising fluorinating titanium ore, and reducing the formed alkaline earth fluotitanate with an alkaline earth metal in an induction slag reactor.

Traut, Davis E. (Corvallis, OR)

1991-01-01T23:59:59.000Z

120

The time dependent resistance and inductance of the electric discharges in pulsed gas lasers  

SciTech Connect

A method of finding the time dependent resistances and inductances in the discharges in pulsed gas lasers is described in this work. According to this method the waveforms of the laser circuit voltages are digitized and their first and second derivatives are calculated. There are substituted into the differential equations governing the behavior of the system and relationships among the resistances and inductances are formed for every time. Using relationships from a sequence of four very closed adjacent time instants and considering that during this short time interval the resistances and inductances are varied linearly, their values can be found for this particular time interval. Repeating the same procedure for other time intervals and scanning the entire time region of the discharge, the time histories of the resistances and inductances of the discharges are revealed. These show strong variations in the formation phase of the discharge (first 50 nsec). Specifically the resistances drop rapidly (first 10 nsec) from very high values to low values, while the inductances increase to high values and subsequently decrease, forming an abrupt high peak. The steep drop of the resistances is due to the electron avalanche multiplication, while the peak of the inductances is due to the centripetal magnetic forces (Laplace forces), which cause a temporary constriction of the plasma. In the main phase of the discharge the resistances present a damping oscillation with the same frequency as the voltages, while the inductances present light fluctuations around constant values.

Persephonis, P.; Giannetas, V.; Ioannou, A.; Parthenios, J.; Georgiades, C. [Univ. of Patras, Patra (Greece). Dept. of Physics

1995-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "vlf induction method" 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

Mobile inductively coupled plasma system  

DOE Patents (OSTI)

A system is described for sampling and analyzing a material located at a hazardous site. A laser located remotely from the hazardous site is connected to an optical fiber, which directs laser radiation proximate the material at the hazardous site. The laser radiation abates a sample of the material. An inductively coupled plasma is located remotely from the material. An aerosol transport system carries the ablated particles to a plasma, where they are dissociated, atomized and excited to provide characteristic optical reduction of the elemental constituents of the sample. An optical spectrometer is located remotely from the site. A second optical fiber is connected to the optical spectrometer at one end and the plasma source at the other end to carry the optical radiation from the plasma source to the spectrometer. 10 figs.

D`Silva, A.P.; Jaselskis, E.J.

1999-03-30T23:59:59.000Z

122

Parallel algorithms for inductance extraction of VLSI circuits  

Science Conference Proceedings (OSTI)

Inductance extraction involves estimating the mutual inductance in a VLSI circuit. Due to increasing clock speed and diminishing feature sizes of modern VLSI circuits, the effects of inductance are increasingly felt during the testing and verification ...

Hemant Mahawar; Vivek Sarin

2006-04-01T23:59:59.000Z

123

Observing geomagnetic induction in magnetic satellite measurements and associated  

E-Print Network (OSTI)

Observing geomagnetic induction in magnetic satellite measurements and associated implications in the midlatitude satellite passes lower than 50 degrees geomagnetic latitude. At higher latitudes, auroral: Satellite induction. Index Terms: 1515 Geomagnetism and Paleomagnetism: Geomagnetic induction; 3914 Mineral

Constable, Steve

124

Performances of Induction System for Nanosecond Mode Operation  

SciTech Connect

An induction system comprises an array of single turn pulse transformers. Ferromagnetic cores of transformers are toroids that are stacked along the longitudinal core axis. Another name for this array is a fraction transformer or an adder. The primary and secondary windings of such a design have one turn. The step up mode is based on the number of primary pulse sources. The secondary windings are connected in series. Performances of such a system for the nanosecond range mode operation are different in comparison to the performances of traditional multi-turn pulse transformers, which are working on a 100+ nanosecond mode operation. In this paper, the author discusses which aspects are necessary to take into account for the high power nanosecond fractional transformer designs. The engineering method of the nanosecond induction system design is presented.

Krasnykh, Anatoly; /SLAC

2006-05-16T23:59:59.000Z

125

AOCS Official Method Ca 17-01  

Science Conference Proceedings (OSTI)

Determination of Trace Elements (Calcium, Copper, Iron, Magnesium, Nickel, Silicon, Sodium, Lead, and Cadmium) in Oil by Inductively Coupled Plasma Optical Emission Spectroscopy AOCS Official Method Ca 17-01 Methods Methods and Analyses Analytical Chemi

126

Standard guide for mutual inductance bridge applications for wall thickness determinations in boiler tubing  

E-Print Network (OSTI)

1.1 This guide describes a procedure for obtaining relative wall thickness indications in ferromagnetic and non-ferromagnetic steels using the mutual inductance bridge method. The procedure is intended for use with instruments capable of inducing two substantially identical magnetic fields and noting the change in inductance resulting from differing amounts of steel. It is used to distinguish acceptable wall thickness conditions from those which could place tubular vessels or piping at risk of bursting under high temperature and pressure conditions. 1.2 This guide is intended to satisfy two general needs for users of industrial Mutual Inductance Bridge (MIB) equipment: (1) the need for a tutorial guide addressing the general principles of Mutual Inductance Bridges as they apply to industrial piping; and (2) the need for a consistent set of MIB performance parameter definitions, including how these performance parameters relate to MIB system specifications. Potential users and buyers, as well as experienced M...

American Society for Testing and Materials. Philadelphia

2010-01-01T23:59:59.000Z

127

Inductive tuners for microwave driven discharge lamps  

DOE Patents (OSTI)

An RF powered electrodeless lamp utilizing an inductive tuner in the waveguide which couples the RF power to the lamp cavity, for reducing reflected RF power and causing the lamp to operate efficiently.

Simpson, James E. (Gaithersburg, MD)

1999-01-01T23:59:59.000Z

128

Finding counter examples in induction proofs  

Science Conference Proceedings (OSTI)

This paper addresses a problem arising in automated proof of invariants of transition systems, for example transition systems modelling distributed programs. Most of the time, the actual properties we want to prove are too weak to hold inductively, and ...

Koen Claessen; Hans Svensson

2008-04-01T23:59:59.000Z

129

Utilizing the connected power electronic converter for improved condition monitoring of induction motors and claw-pole generators.  

E-Print Network (OSTI)

??This dissertation proposes several simple, robust, and non-intrusive condition monitoring methods for induction motors fed by closed-loop inverters and claw-pole generators with built-in rectifiers. While… (more)

Cheng, Siwei

2012-01-01T23:59:59.000Z

130

Hybrid-secondary uncluttered induction machine  

DOE Patents (OSTI)

An uncluttered secondary induction machine (100) includes an uncluttered rotating transformer (66) which is mounted on the same shaft as the rotor (73) of the induction machine. Current in the rotor (73) is electrically connected to current in the rotor winding (67) of the transformer, which is not electrically connected to, but is magnetically coupled to, a stator secondary winding (40). The stator secondary winding (40) is alternately connected to an effective resistance (41), an AC source inverter (42) or a magnetic switch (43) to provide a cost effective slip-energy-controlled, adjustable speed, induction motor that operates over a wide speed range from below synchronous speed to above synchronous speed based on the AC line frequency fed to the stator.

Hsu, John S. (Oak Ridge, TN)

2001-01-01T23:59:59.000Z

131

Open Problems in Universal Induction & Intelligence  

E-Print Network (OSTI)

Specialized intelligent systems can be found everywhere: finger print, handwriting, speech, and face recognition, spam filtering, chess and other game programs, robots, et al. This decade the first presumably complete mathematical theory of artificial intelligence based on universal induction-prediction-decision-action has been proposed. This information-theoretic approach solidifies the foundations of inductive inference and artificial intelligence. Getting the foundations right usually marks a significant progress and maturing of a field. The theory provides a gold standard and guidance for researchers working on intelligent algorithms. The roots of universal induction have been laid exactly half-a-century ago and the roots of universal intelligence exactly one decade ago. So it is timely to take stock of what has been achieved and what remains to be done. Since there are already good recent surveys, I describe the state-of-the-art only in passing and refer the reader to the literature. This article concent...

Hutter, Marcus

2009-01-01T23:59:59.000Z

132

Inductive gas line for pulsed lasers  

DOE Patents (OSTI)

A gas laser having a metal inlet gas feed line assembly shaped as a coil, to function as an electrical inductance and therefore high impedance to pulses of electric current applied to electrodes at opposite ends of a discharge tube of a laser, for example. This eliminates a discharge path for the laser through the inlet gas feed line. A ferrite core extends through the coil to increase the inductance of the coil and provide better electric isolation. By elimination of any discharge breakdown through the gas supply, efficiency is increased and a significantly longer operating lifetime of the laser is provided.

Benett, W.J.; Alger, T.W.

1982-09-29T23:59:59.000Z

133

Steady-state inductive spheromak operation  

DOE Patents (OSTI)

The inductively formed spheromak plasma can be maintained in a highly stable and controlled fashion. Steady-state operation is obtained by forming the plasma in the linked mode, then oscillating the poloidal and toroidal fields such that they have different phases. Preferably, the poloidal and magnetic fields are 90.degree. out of phase.

Janos, Alan C. (E. Windsor, NJ); Jardin, Stephen C. (Princeton, NJ); Yamada, Masaaki (Lawrenceville, NJ)

1987-01-01T23:59:59.000Z

134

Emotion induction during human-robot interaction  

Science Conference Proceedings (OSTI)

The aim of the presented study was to measure physiological correlates of emotions that are of particular interest in the field of human-robot interaction (HRI). Therefore, we did not focus on self-induced basic emotions but rather evoked states that ... Keywords: emotion recognition, human-robot interaction, joint construction, stress induction

Cornelia Wendt; Michael Popp; Berthold Faerber

2009-03-01T23:59:59.000Z

135

Thyristor stack for pulsed inductive plasma generation  

Science Conference Proceedings (OSTI)

A thyristor stack for pulsed inductive plasma generation has been developed and tested. The stack design includes a free wheeling diode assembly for current reversal. Triggering of the device is achieved by a high side biased, self supplied gate driver unit using gating energy derived from a local snubber network. The structure guarantees a hard firing gate pulse for the required high dI/dt application. A single fiber optic command is needed to achieve a simultaneous turn on of the thyristors. The stack assembly is used for switching a series resonant circuit with a ringing frequency of 30 kHz. In the prototype pulsed power system described here an inductive discharge has been generated with a pulse duration of 120 {mu}s and a pulse energy of 50 J. A maximum power transfer efficiency of 84% and a peak power of 480 kW inside the discharge were achieved. System tests were performed with a purely inductive load and an inductively generated plasma acting as a load through transformer action at a voltage level of 4.1 kV, a peak current of 5 kA, and a current switching rate of 1 kA/{mu}s.

Teske, C.; Jacoby, J.; Schweizer, W.; Wiechula, J. [Plasmaphysics Group, Institute of Applied Physics, Johann-Wolfgang-Goethe University, 60438 Frankfurt am Main (Germany)

2009-03-15T23:59:59.000Z

136

Cylindrical Induction Melter Modicon Control System  

SciTech Connect

In the last several years an extensive R{ampersand}D program has been underway to develop a vitrification system to stabilize Americium (Am) and Curium (Cm) inventories at SRS. This report documents the Modicon control system designed for the 3 inch Cylindrical Induction Melter (CIM).

Weeks, G.E. [Westinghouse Savannah River Company, AIKEN, SC (United States)

1998-04-01T23:59:59.000Z

137

Evolutionary induction of stochastic context free grammars  

Science Conference Proceedings (OSTI)

This paper describes an evolutionary approach to the problem of inferring stochastic context-free grammars from finite language samples. The approach employs a distributed, steady-state genetic algorithm, with a fitness function incorporating a prior ... Keywords: Genetic algorithm, Grammar induction, Grammatical inference, Language modeling, Stochastic context-free grammar

Bill Keller; Rudi Lutz

2005-09-01T23:59:59.000Z

138

Voltage regulation in linear induction accelerators  

DOE Patents (OSTI)

Improvement in voltage regulation in a Linear Induction Accelerator wherein a varistor, such as a metal oxide varistor when it is placed in parallel with the beam accelerating cavity and the magnetic core. The non-linear properties of the varistor result in a more stable voltage across the beam accelerating cavity than with a conventional compensating resistance.

Parsons, W.M.

1991-03-19T23:59:59.000Z

139

Voltage regulation in linear induction accelerators  

DOE Patents (OSTI)

Improvement in voltage regulation in a linear induction accelerator wherein a varistor, such as a metal oxide varistor, is placed in parallel with the beam accelerating cavity and the magnetic core is disclosed. The non-linear properties of the varistor result in a more stable voltage across the beam accelerating cavity than with a conventional compensating resistance. 4 figs.

Parsons, W.M.

1992-12-29T23:59:59.000Z

140

Voltage unbalance effects on induction motor performance  

Science Conference Proceedings (OSTI)

The reliability of electric drives and driven motors depends on the quality of the power supply voltage especially in the critical industrial process. In this work, a theoretical study of the effects of voltage unbalances, sags and swells on induction ... Keywords: efficiency, power losses and derating factor, sags, symmetrical components, voltage unbalance

L. Refoufi; H. Bentarzi; F. Z. Dekhandji

2006-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "vlf induction method" 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

Aeromagnetic Survey At Kilauea Summit Area (Zablocki, 1978) | Open Energy  

Open Energy Info (EERE)

Zablocki, 1978) Zablocki, 1978) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Aeromagnetic Survey At Kilauea Summit Area (Zablocki, 1978) Exploration Activity Details Location Kilauea Summit Area Exploration Technique Aeromagnetic Survey Activity Date Usefulness could be useful with more improvements DOE-funding Unknown Notes These VLF induction methods should have wide application to studies of active volcanic regions in other parts of the world and could provide some insights into the workings of larger-scaled geothermal systems. Uses high-resolution aeromagnetics References Charles J. Zablocki (1978) Applications of the VLF Induction Method For Studying Some Volcanic Processes of Kilauea Volcano, Hawaii Retrieved from "http://en.openei.org/w/index.php?title=Aeromagnetic_Survey_At_Kilauea_Summit_Area_(Zablocki,_1978)&oldid=40223

142

Induction Lighting: An Old Lighting Technology Made New Again | Department  

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

Induction Lighting: An Old Lighting Technology Made New Again Induction Lighting: An Old Lighting Technology Made New Again Induction Lighting: An Old Lighting Technology Made New Again July 27, 2009 - 5:00am Addthis John Lippert Induction lighting is one of the best kept secrets in energy-efficient lighting. Simply stated, induction lighting is essentially a fluorescent light without electrodes or filaments, the items that frequently cause other bulbs to burn out quickly. Thus, many induction lighting units have an extremely long life of up to 100,000 hours. To put this in perspective, an induction lighting system lasting 100,000 hours will last more than 11 years in continuous 24/7 operation, and 25 years if operated 10 hours a day. The technology, however, is far from new. Nikola Tesla demonstrated induction lighting in the late 1890s around the same time that his rival,

143

Magnetic induction systems to harvest energy from mechanical vibrations  

E-Print Network (OSTI)

This thesis documents the design process for magnetic induction systems to harvest energy from mechanical vibrations. Two styles of magnetic induction systems - magnet-through-coil and magnet-across-coils - were analyzed. ...

Jonnalagadda, Aparna S

2007-01-01T23:59:59.000Z

144

Knowledge-directed induction in a DB environment  

Science Conference Proceedings (OSTI)

Integrated with Artificial Intelligence (AI) techniques such as conceptual inductive inference, databases can become important sources of knowledge for people and expert systems in various application domains. This paper describes an inductive model ...

Min Ke; Moonis Ali

1990-06-01T23:59:59.000Z

145

Excitation and control of a high-speed induction generator  

E-Print Network (OSTI)

This project investigates the use of a high speed, squirrel cage induction generator and power converter for producing DC electrical power onboard ships and submarines. Potential advantages of high speed induction generators ...

Englebretson, Steven Carl

2005-01-01T23:59:59.000Z

146

Coating method for graphite  

DOE Patents (OSTI)

A method of limiting carbon contamination from graphite ware used in induction melting of uranium alloys is provided. The graphite surface is coated with a suspension of Y/sub 2/O/sub 3/ particles in water containing about 1.5 to 4 percent by weight sodium carboxymethylcellulose.

Banker, J.G.; Holcombe, C.E. Jr.

1975-11-06T23:59:59.000Z

147

High density growth of T7 expression strains with auto-induction option  

DOE Patents (OSTI)

A method for promoting and suppressing auto-induction of transcription of a cloned gene 1 of bacteriophage T7 in cultures of bacterial cells grown batchwise is disclosed. The transcription is under the control of a promoter whose activity can be induced by an exogenous inducer whose ability to induce said promoter is dependent on the metabolic state of said bacterial cells.

Studier, F. William

2013-03-19T23:59:59.000Z

148

In situ calibration of inductively coupled plasma-atomic emission and mass spectroscopy  

DOE Patents (OSTI)

A method and apparatus for in situ addition calibration of an inductively coupled plasma atomic emission spectrometer or mass spectrometer using a precision gas metering valve to introduce a volatile calibration gas of an element of interest directly into an aerosol particle stream. The present situ calibration technique is suitable for various remote, on-site sampling systems such as laser ablation or nebulization.

Braymen, Steven D. (Ames, IA)

1996-06-11T23:59:59.000Z

149

Analysis of wound rotor self-excited induction generators  

Science Conference Proceedings (OSTI)

Self-excited induction generators are found to be to be most suitable machines for wind energy conversion in remote and windy areas due to several advantages over grid connected machines. Such machine exhibits poor performance in terms of voltage and ... Keywords: induction generator, renewable generation, self-excited induction generator, steady state analysis (SSA), wind energy generation

K. S. Sandhu; S. P. Jain

2008-01-01T23:59:59.000Z

150

DOE - Office of Legacy Management -- Tocco Induction Heating Div of Ohio  

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

Tocco Induction Heating Div of Ohio Tocco Induction Heating Div of Ohio Crankshaft Co - OH 42 FUSRAP Considered Sites Site: TOCCO INDUCTION HEATING, DIV. OF OHIO CRANKSHAFT CO. (OH.42 ) Eliminated from consideration under FUSRAP Designated Name: Not Designated Alternate Name: None Location: Cleveland , Ohio OH.42-1 Evaluation Year: 1994 OH.42-2 OH.42-3 Site Operations: Tested uranium heating methods during the late 1960s; only small amounts of material indicated. OH.42-1 OH.42-3 Site Disposition: Eliminated - Potential for contamination considered remote based on limited quantities of material handled OH.42-2 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Uranium OH.42-1 Radiological Survey(s): Yes - health and safety monitoring during operations only OH.42-1

151

Acceleration Modules in Linear Induction Accelerators  

E-Print Network (OSTI)

Linear Induction Accelerator (LIA) is a unique type of accelerator, which is capable to accelerate kiloAmpere charged particle current to tens of MeV energy. The present development of LIA in MHz busting mode and successful application into synchrotron broaden LIAs usage scope. Although transformer model is widely used to explain the acceleration mechanism of LIAs, it is not appropriate to consider the induction electric field as the field which accelerates charged particles for many modern LIAs. Authors examined the transition of the magnetic cores functions during LIA acceleration modules evolution, distinguished transformer type and transmission line type LIA acceleration modules, and reconsidered several related issues based on transmission line type LIA acceleration module. The clarified understanding should be helpful in the further development and design of the LIA acceleration modules.

Wang, Shaoheng

2013-01-01T23:59:59.000Z

152

On electromagnetic induction in electric conductors  

E-Print Network (OSTI)

Experimental validation of the Faraday's law of electromagnetic induction (EMI) is performed when an electromotive force is generated in thin copper turns, located inside a large magnetic coil. It has been established that the electromotive force (emf) value should be dependent not only on changes of the magnetic induction flux through a turn and on symmetry of its crossing by magnetic power lines also. The law of EMI is applicable in sufficient approximation in case of the changes of the magnetic field near the turn are symmetrical. Experimental study of the induced emf in arcs and a direct section of the conductor placed into the variable field has been carried out. Linear dependence of the induced emf on the length of the arc has been ascertained in case of the magnetic field distribution symmetry about it. Influence of the magnetic field symmetry on the induced emf in the arc has been observed. The curve of the induced emf in the direct section over period of current pulse is similar to this one for the turns and arcs. The general law of EMI for a curvilinear conductor has been deduced. Calculation of the induced emf in the turns wrapped over it and comparison with the experimental data has been made. The proportionality factor has been ascertained for the law. Special conditions have been described, when the induced emf may not exist in the presence of inductive current. Theoretical estimation of the inductive current has been made at a induced low voltage in the turn. It has been noted the necessity to take into account the concentration of current carriers in calculation of the induced emf in semiconductors and ionized conductors.

Alexander I. Korolev

2013-02-22T23:59:59.000Z

153

CHAPTER 7. BERYLLIUM ANALYSIS BY NON-PLASMA BASED METHODS  

SciTech Connect

The most common method of analysis for beryllium is inductively coupled plasma atomic emission spectrometry (ICP-AES). This method, along with inductively coupled plasma mass spectrometry (ICP-MS), is discussed in Chapter 6. However, other methods exist and have been used for different applications. These methods include spectroscopic, chromatographic, colorimetric, and electrochemical. This chapter provides an overview of beryllium analysis methods other than plasma spectrometry (inductively coupled plasma atomic emission spectrometry or mass spectrometry). The basic methods, detection limits and interferences are described. Specific applications from the literature are also presented.

Ekechukwu, A

2009-04-20T23:59:59.000Z

154

Inductively Coupled Plasma Mass Spectrometry Uranium Error Propagation  

SciTech Connect

The Hazards Control Department at Lawrence Livermore National Laboratory (LLNL) uses Inductively Coupled Plasma Mass Spectrometer (ICP/MS) technology to analyze uranium in urine. The ICP/MS used by the Hazards Control Department is a Perkin-Elmer Elan 6000 ICP/MS. The Department of Energy Laboratory Accreditation Program requires that the total error be assessed for bioassay measurements. A previous evaluation of the errors associated with the ICP/MS measurement of uranium demonstrated a {+-} 9.6% error in the range of 0.01 to 0.02 {micro}g/l. However, the propagation of total error for concentrations above and below this level have heretofore been undetermined. This document is an evaluation of the errors associated with the current LLNL ICP/MS method for a more expanded range of uranium concentrations.

Hickman, D P; Maclean, S; Shepley, D; Shaw, R K

2001-07-01T23:59:59.000Z

155

Induction Consolidation of Thermoplastic Composites Using Smart Susceptors  

SciTech Connect

This project has focused on the area of energy efficient consolidation and molding of fiber reinforced thermoplastic composite components as an energy efficient alternative to the conventional processing methods such as autoclave processing. The expanding application of composite materials in wind energy, automotive, and aerospace provides an attractive energy efficiency target for process development. The intent is to have this efficient processing along with the recyclable thermoplastic materials ready for large scale application before these high production volume levels are reached. Therefore, the process can be implemented in a timely manner to realize the maximum economic, energy, and environmental efficiencies. Under this project an increased understanding of the use of induction heating with smart susceptors applied to consolidation of thermoplastic has been achieved. This was done by the establishment of processing equipment and tooling and the subsequent demonstration of this fabrication technology by consolidating/molding of entry level components for each of the participating industrial segments, wind energy, aerospace, and automotive. This understanding adds to the nation's capability to affordably manufacture high quality lightweight high performance components from advanced recyclable composite materials in a lean and energy efficient manner. The use of induction heating with smart susceptors is a precisely controlled low energy method for the consolidation and molding of thermoplastic composites. The smart susceptor provides intrinsic thermal control based on the interaction with the magnetic field from the induction coil thereby producing highly repeatable processing. The low energy usage is enabled by the fact that only the smart susceptor surface of the tool is heated, not the entire tool. Therefore much less mass is heated resulting in significantly less required energy to consolidate/mold the desired composite components. This energy efficiency results in potential energy savings of {approx}75% as compared to autoclave processing in aerospace, {approx}63% as compared to compression molding in automotive, and {approx}42% energy savings as compared to convectively heated tools in wind energy. The ability to make parts in a rapid and controlled manner provides significant economic advantages for each of the industrial segments. These attributes were demonstrated during the processing of the demonstration components on this project.

Matsen, Marc R

2012-06-14T23:59:59.000Z

156

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 34, NO. 1, JANUARY/FEBRUARY 1998 117 Comparison of Induction Motor Field  

E-Print Network (OSTI)

of Induction Motor Field Efficiency Evaluation Methods John S. Hsu, Senior Member, IEEE, John D. Kueck, Senior Abstract-- Unlike testing motor efficiency in a laboratory, certain methods given in IEEE Standard 112 cannot be used for motor efficiency evaluations in the field. For example, it is difficult to load

Tolbert, Leon M.

157

Starter for inductively coupled plasma tube  

DOE Patents (OSTI)

A starter assembly is provided for use with an inductively coupled plasma (ICP) tube to reliably initiate a plasma at internal pressures above about 30 microns. A conductive probe is inserted within the inductor coil about the tube and insulated from the tube shield assembly. A capacitive circuit is arranged for momentarily connecting a high voltage radio-frequency generator to the probe while simultaneously energizing the coil. When the plasma is initiated the probe is disconnected from the generator and electrically connected to the shield assembly for operation. 1 fig.

Hull, D.E.; Bieniewski, T.M.

1988-08-23T23:59:59.000Z

158

Segmented ceramic liner for induction furnaces  

DOE Patents (OSTI)

A non-fibrous ceramic liner for induction furnaces is provided by vertically stackable ring-shaped liner segments made of ceramic material in a light-weight cellular form. The liner segments can each be fabricated as a single unit or from a plurality of arcuate segments joined together by an interlocking mechanism. Also, the liner segments can be formed of a single ceramic material or can be constructed of multiple concentric layers with the layers being of different ceramic materials and/or cellular forms. Thermomechanically damaged liner segments are selectively replaceable in the furnace. 5 figs.

Gorin, A.H.; Holcombe, C.E.

1994-07-26T23:59:59.000Z

159

Starter for inductively coupled plasma tube  

DOE Patents (OSTI)

A starter assembly is provided for use with an inductively coupled plasma (ICP) tube to reliably initate a plasma at internal pressures above about 30 microns. A conductive probe is inserted within the inductor coil about the tube and insulated from the tube shield assembly. A capacitive circuit is arranged for momentarily connecting a high voltage radio-frequency generator to the probe while simultaneously energizing the coil. When the plasma is initiated the probe is disconnected from the generator and electrically connected to the shield assembly for operation.

Hull, Donald E. (969 Nambe Loop, Los Alamos, NM 87544); Bieniewski, Thomas M. (285 Donna Ave., Los Alamos, NM 87544)

1988-01-01T23:59:59.000Z

160

Technology development for high power induction accelerators  

SciTech Connect

The marriage of Induction Linac technology with Nonlinear Magnetic Modulators has produced some unique capabilities. It appears possible to produce electron beams with average currents measured in amperes, at gradients exceeding 1 MeV/meter, and with power efficiencies approaching 50%. A 2 MeV, 5 kA electron accelerator has been constructed at the Lawrence Livermore National Laboratory (LLNL) to demonstrate these concepts and to provide a test facility for high brightness sources. The pulse drive for the accelerator is based on state-of-the-art magnetic pulse compressors with very high peak power capability, repetition rates exceeding a kilohertz and excellent reliability.

Birx, D.L.; Reginato, L.L.

1985-06-11T23:59:59.000Z

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


161

Electronic Radio-Frequency (Electrodeless) Induction Lamps: A Fluorescent Technology  

Science Conference Proceedings (OSTI)

This EPRI Technical Update addresses an expanding energy efficient light source electronic radio-frequency (electrodeless) induction lamps. Business and technical market factors (Chapter 2) use the past and future growth of the CFL market to illustrate the potential for the induction lighting market while emphasizing future technical improvements. Discussion of the importance of utility involvement in helping their customers consider induction lamps for high-efficiency fluorescent applications with long-...

2007-12-20T23:59:59.000Z

162

Segmented rail linear induction motor - Energy Innovation Portal  

A segmented rail linear induction motor has a segmented rail consisting of a plurality of nonferrous electrically conductive segments aligned along a guideway. The ...

163

Motor torque compensation of an induction electric motor by ...  

Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature United States Patent

164

Induction Furnace Quench & Temper of Oil Field Tubular Goods  

Science Conference Proceedings (OSTI)

Because of the unique operating features of an induction furnace, each pipe is individually heat treated, producing more uniform properties than possible with ...

165

Available Technologies: High Efficiency Spiral RF-Induction ...  

The spiral antennas efficient use of source geometry also ... Neutron and high energy gamma ... A typical RF-induction plasma generator with a ...

166

In vitro tetraploid induction via colchicine treatment from diploid ...  

Science Conference Proceedings (OSTI)

Abstract A protocol for in vitro induction of tetraploids via colchicine-treated .... Following the protocol for immature zygotic embryos cultures .... V. rupestris callus.

167

Seismic baseline and induction studies- Roosevelt Hot Springs...  

Open Energy Info (EERE)

Seismic baseline and induction studies- Roosevelt Hot Springs, Utah and Raft River, Idaho Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Seismic baseline and...

168

High resolution inductively coupled plasma etching of 30 nm lines ...  

The electrostatic shield around the ICP tube is used to ensure that the ICP power is purely inductively coupled ~i.e., ‘‘true ICP’’!, hence elimi-

169

Verification and validation for induction heating  

SciTech Connect

Truchas is a software package being developed at LANL within the Telluride project for predicting the complex physical processes in metal alloy casting. The software was designed to be massively parallel, multi-material, multi-physics, and to run on 3D, fully unstructured meshes. This work describes a Verification and Validation assessment of Truchas for simulating the induction heating phase of a casting process. We used existing data from a simple experiment involving the induction heating of a graphite cylinder, as graphite is a common material used for mold assemblies. Because we do not have complete knowledge of all the conditions and properties in this experiment (as is the case in many other experiments), we performed a parameter sensitivity study, modeled the uncertainties of the most sensitive parameters, and quantified how these uncertainties propagate to the Truchas output response. A verification analysis produced estimates of the numerical error of the Truchas solution to our computational model. The outputs from Truchas runs with randomly sampled parameter values were used for the validation study.

Lam, Kin [Los Alamos National Laboratory; Tippetts, Trevor B [Los Alamos National Laboratory; Allen, David W [NON LANL

2008-01-01T23:59:59.000Z

170

Radiation induction of cancer of the skin  

SciTech Connect

The induction of epidermal tumors was studied using exposures to 25 kV x-rays with or without subsequent exposures to 12-0-tetradeconyl phorbol-13 acetate (TPA) or ultraviolet radiation (uvr) 280-400 nm. Fractionation regimens and total exposure up to 4000R produced no squamous cell carcinomas. When these regimes were followed by TPA an incidence of about 80% was obtained, and incidence of 60% when uvr exposures followed the x-irradiation. A dose-dependent increase in fibrosarcomas was found when x-irradiation was followed by 24 weeks of topical treatment with TPA. These results support the contention that uvr can enhance the expression of cells initiated by x-rays. The experimental evidence is compared with the data from the tinea capitis patients treated with x-rays. In C3HF/He male mice exposed to 50, 100, 150 and 200 rads /sup 137/Cs gamma rays the induction rate for fibrosarcomas was 2.9 x 10/sup -4/ per cGy/per mouse. This result compares with 2.5 x 10/sup -6/ transformations per surviving cell per cGy with 10T1/2 cells that are fibroblasts derived from C3H mice. 16 refs., 1 fig., 1 tab.

Fry, R.J.M.; Storer, J.B.; Burns, F.J.

1985-01-01T23:59:59.000Z

171

In situ calibration of inductively coupled plasma-atomic emission and mass spectroscopy  

DOE Patents (OSTI)

A method and apparatus are disclosed for in situ addition calibration of an inductively coupled plasma atomic emission spectrometer or mass spectrometer using a precision gas metering valve to introduce a volatile calibration gas of an element of interest directly into an aerosol particle stream. The present in situ calibration technique is suitable for various remote, on-site sampling systems such as laser ablation or nebulization. 5 figs.

Braymen, S.D.

1996-06-11T23:59:59.000Z

172

Steady State Analysis of an induction generator infinite bus system  

E-Print Network (OSTI)

analysis of grid connected wind energy conver- sion systems employing induction generators, one1 Steady State Analysis of an induction generator infinite bus system Rajesh G Kavasseri Department of Electrical and Computer Engineering North Dakota State University, Fargo, ND 58105 - 5285, USA (email: rajesh

Kavasseri, Rajesh

173

Doubly-fed induction generator torque in wind turbines  

Science Conference Proceedings (OSTI)

The field oriented doubly-fed induction generator (DFIG) is being increasingly used in variable speed wind turbines. It is therefore indispensable to become better acquainted with electrical and mechanical DFIG features in both stationary and dynamic ... Keywords: doubly-fed induction generator (DFIG), torque characteristic of DFIG

Jurica Smajo; Dinko Vukadinovic

2008-02-01T23:59:59.000Z

174

Doubly-fed induction generator used in wind energy  

Science Conference Proceedings (OSTI)

Wound-rotor induction generator has numerous advantages in wind power generation over other generators. One scheme for wound-rotor induction generator is realized when a converter cascade is used between the slip-ring terminals and the utility grid to ...

Hany M. Jabr Soloumah

2008-01-01T23:59:59.000Z

175

Control of Doubly-Fed Induction Generator System Using PIDNNs  

Science Conference Proceedings (OSTI)

An intelligent control stand-alone doubly-fed induction generator (DFIG) system using proportional-integral-derivative neural network (PIDNN) is proposed in this study. This system can be applied as a stand-alone power supply system or as the emergency ... Keywords: Doubly-fed induction generator, field-oriented control, proportional-integral-derivative neural network

Faa-Jeng Lin; Jonq-Chin Hwang; Kuang-Hsiung Tan; Zong-Han Lu; Yung-Ruei Chang

2010-12-01T23:59:59.000Z

176

Inductive Reasoning and Programming Visualization, an Experiment Proposal  

Science Conference Proceedings (OSTI)

We lay down plans to study how Inductive Reasoning Ability (IRA) affects the analyzing and understanding of Program Visualization (PV) systems. Current PV systems do not take into account the abilities of the user but show always the same visualization ... Keywords: Adaptive systems, Inductive reasoning, Program visualization, User modelling

Andrés Moreno; Niko Myller; Erkki Sutinen; Taiyu Lin; Kinshuk

2007-07-01T23:59:59.000Z

177

Pharmacophore Discovery Using the Inductive Logic Programming System PROGOL  

Science Conference Proceedings (OSTI)

This paper presents a case study of a machine-aided knowledge discovery process within the general area of drug design. Within drug design, the particular problem of pharmacophore discovery is isolated, and the Inductive Logic Programming (ILP) system ... Keywords: inductive logic programming, pharmacophore, structure-activity prediction

Paul Finn; Stephen Muggleton; David Page; Ashwin Srinivasan

1998-02-01T23:59:59.000Z

178

Vacuum Induction Melting Unit Induction heating is a process wherein induced eddy currents heat conductive materials. This heating  

E-Print Network (OSTI)

Vacuum Induction Melting Unit Induction heating is a process wherein induced eddy currents heat can be melted at a time. There are three main parts to the system: chiller, power unit and vacuum unit. The vacuum unit with rotary and diffusion pumps can attain a vacuum of 106 m bar. The power can deliver

Subramaniam, Anandh

179

Dynamic average-value modeling of doubly-fed induction generator wind energy conversion systems.  

E-Print Network (OSTI)

??In a Doubly-fed Induction Generator (DFIG) wind energy conversion system, the rotor of a wound rotor induction generator is connected to the grid via a… (more)

Shahab, Azin

2013-01-01T23:59:59.000Z

180

The design evaluation of inductive power-transformer for personal rapid transit by measuring impedance  

SciTech Connect

The contact-less inductive power transformer (IPT) uses the principle of electromagnetic induction. The concept of the IPT for vehicles such as the personal rapid transit (PRT) system is proposed and some suggestions for power collector design of IPT to improve power transfer performance are presented in this paper. The aim of this paper is to recommend the concept of IPT for vehicles such as the PRT system and also to present some propositions for the power collector design of the IPT, which is to improve the power transfer performance. Generally, there are diverse methods to evaluate transfer performance of the traditional transformers. Although the principle of IPT is similar to that of the general transformer, it is impossible to apply the methods directly because of large air gap. The system must be compensated by resonant circuit due to the large air gap. Consequently, it is difficult to apply numerical formulas to the magnetic design of IPT systems. This paper investigates the magnetic design of a PRT system using three-dimensional magnetic modeling and measurements of the pick-up coupling coefficient and its impedances. In addition, how the use of Litz wire and leakage inductance is related will be observed through experiment and simulation.

Han, Kyung-Hee [Department of Electrical Engineering, Dongguk University, Seoul 100-715 (Korea, Republic of); Department of Electricity and Signaling, Korea Railroad Research Institute, Uiwang, Kyonggi 437-050 (Korea, Republic of); Lee, Byung-Song [Department of Electricity and Signaling, Korea Railroad Research Institute, Uiwang, Kyonggi 437-050 (Korea, Republic of); Baek, Soo-Hyun [Department of Electrical Engineering, Dongguk University, Seoul 100-715 (Korea, Republic of)

2008-04-01T23:59:59.000Z

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


181

Inductive classification of multipartite entanglement under stochastic local operations and classical communication  

SciTech Connect

We propose an inductive procedure to classify N-partite entanglement under stochastic local operations and classical communication provided such a classification is known for N-1 qubits. The method is based upon the analysis of the coefficient matrix of the state in an arbitrary product basis. We illustrate this approach in detail with the well-known bipartite and tripartite systems, obtaining as a by-product a systematic criterion to establish the entanglement class of a given pure state without resourcing to any entanglement measure. The general case is proved by induction, allowing us to find an upper bound for the number of N-partite entanglement classes in terms of the number of entanglement classes for N-1 qubits.

Lamata, L.; Leon, J. [Instituto de Matematicas y Fisica Fundamental, CSIC, c/ Serrano, 113-bis, 28006 Madrid (Spain); Salgado, D. [Dpto. Fisica Teorica, Universidad Autonoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Cantoblanco, Madrid (Spain); Solano, E. [Max-Planck-Institut fuer Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching (Germany); Depto. Ciencias, Seccion Fisica, Pontificia Universidad Catolica del Peru, 1761 Lima (Peru)

2006-11-15T23:59:59.000Z

182

Use of miniature magnetic sensors for real-time control of the induction heating process  

DOE Patents (OSTI)

A method of monitoring the process of induction heating a workpiece. A miniature magnetic sensor located near the outer surface of the workpiece measures changes in the surface magnetic field caused by changes in the magnetic properties of the workpiece as it heats up during induction heating (or cools down during quenching). A passive miniature magnetic sensor detects a distinct magnetic spike that appears when the saturation field, B.sub.sat, of the workpiece has been exceeded. This distinct magnetic spike disappears when the workpiece's surface temperature exceeds its Curie temperature, due to the sudden decrease in its magnetic permeability. Alternatively, an active magnetic sensor can also be used to measure changes in the resonance response of the monitor coil when the excitation coil is linearly swept over 0-10 MHz, due to changes in the magnetic permeability and electrical resistivity of the workpiece as its temperature increases (or decreases).

Bentley, Anthony E. (Tijeras, NM); Kelley, John Bruce (Albuquerque, NM); Zutavern, Fred J. (Albuquerque, NM)

2002-01-01T23:59:59.000Z

183

Control of power to an inductively heated part  

DOE Patents (OSTI)

A process for induction hardening a part to a desired depth with an AC signal applied to the part from a closely coupled induction coil includes measuring the voltage of the AC signal at the coil and the current passing through the coil; and controlling the depth of hardening of the part from the measured voltage and current. The control system determines parameters of the part that are functions of applied voltage and current to the induction coil, and uses a neural network to control the application of the AC signal based on the detected functions for each part.

Adkins, Douglas R. (1620 Adelita Dr. NE., Albuquerque, NM 87112); Frost, Charles A. (1039 Red Oaks Loop NE., Albuquerque, NM 87122); Kahle, Philip M. (528 Longwood Loop NE., Rio Rancho, NM 87124); Kelley, J. Bruce (13200 Blue Corn Maiden Trail NE., Albuquerque, NM 87112); Stanton, Suzanne L. (2805 Palo Alto NE., Albuquerque, NM 87112)

1997-01-01T23:59:59.000Z

184

High frequency inductive lamp and power oscillator  

DOE Patents (OSTI)

A high frequency inductively coupled electrodeless lamp includes an excitation coil with an effective electrical length which is less than one half wavelength of a driving frequency applied thereto, preferably much less. The driving frequency may be greater than 100 MHz and is preferably as high as 915 MHz. Preferably, the excitation coil is configured as a non-helical, semi-cylindrical conductive surface having less than one turn, in the general shape of a wedding ring. At high frequencies, the current in the coil forms two loops which are spaced apart and parallel to each other. Configured appropriately, the coil approximates a Helmholtz configuration. The lamp preferably utilizes an bulb encased in a reflective ceramic cup with a pre-formed aperture defined therethrough. The ceramic cup may include structural features to aid in alignment and I or a flanged face to aid in thermal management. The lamp head is preferably an integrated lamp head comprising a metal matrix composite surrounding an insulating ceramic with the excitation integrally formed on the ceramic. A novel solid-state oscillator preferably provides RF power to the lamp. The oscillator is a single active element device capable of providing over 70 watts of power at over 70% efficiency. Various control circuits may be employed to adjust the driving frequency of the oscillator.

MacLennan, Donald A. (Gaithersburg, MD); Dymond, Jr., Lauren E. (North Potomac, MD); Gitsevich, Aleksandr (Montgomery Village, MD); Grimm, William G. (Silver Spring, MD); Kipling, Kent (Gaithersburg, MD); Kirkpatrick, Douglas A. (Great Falls, VA); Ola, Samuel A. (Silver Spring, MD); Simpson, James E. (Gaithersburg, MD); Trimble, William C. (Columbia, MD); Tsai, Peter (Olney, MD); Turner, Brian P. (Damascus, MD)

2001-01-01T23:59:59.000Z

185

High frequency inductive lamp and power oscillator  

DOE Patents (OSTI)

A high frequency inductively coupled electrodeless lamp includes an excitation coil with an effective electrical length which is less than one half wavelength of a driving frequency applied thereto, preferably much less. The driving frequency may be greater than 100 MHz and is preferably as high as 915 MHz. Preferably, the excitation coil is configured as a non-helical, semi-cylindrical conductive surface having less than one turn, in the general shape of a wedding ring. At high frequencies, the current in the coil forms two loops which are spaced apart and parallel to each other. Configured appropriately, the coil approximates a Helmholtz configuration. The lamp preferably utilizes an bulb encased in a reflective ceramic cup with a pre-formed aperture defined therethrough. The ceramic cup may include structural features to aid in alignment and/or a flanged face to aid in thermal management. The lamp head is preferably an integrated lamp head comprising a metal matrix composite surrounding an insulating ceramic with the excitation integrally formed on the ceramic. A novel solid-state oscillator preferably provides RF power to the lamp. The oscillator is a single active element device capable of providing over 70 watts of power at over 70% efficiency. Various control circuits may be employed to match the driving frequency of the oscillator to a plurality of tuning states of the lamp.

MacLennan, Donald A. (Gaithersburg, MD); Turner, Brian P. (Damascus, MD); Dolan, James T. (Frederick, MD); Kirkpatrick, Douglas A. (Great Falls, VA); Leng, Yongzhang (Damascus, MD)

2000-01-01T23:59:59.000Z

186

Induction coil configurations, bottom drain assemblies, and ...  

Idaho National Laboratory - Visit the Technology Transfer and Commercialization Office Website: Abstract: Apparatus and methods of operation are ...

187

Induction machine stray loss from inter-bar currents  

E-Print Network (OSTI)

Stray load loss refers generally to the sources of induction machine loss not accounted for by typical calculations of primary or secondary copper loss, no load core loss, or friction and windage loss. Harmonic rotor bar ...

Englebretson, Steven Carl

2009-01-01T23:59:59.000Z

188

Towards a More Efficient Evolutionary Induction of Bayesian Networks  

Science Conference Proceedings (OSTI)

Bayesian networks (BNs) constitute a useful tool to model the joint distribution of a set of random variables of interest. This paper is concerned with the network induction problem. We propose a number of hybrid recombination operators for extracting ...

Carlos Cotta; Jorge Muruzábal

2002-09-01T23:59:59.000Z

189

Coupled-magnetic filters with adaptive inductance cancellation  

E-Print Network (OSTI)

Conventional filter circuits suffer from a number of limitations, including performance degradation due to capacitor parasitic inductance and the size and cost of magnetic elements. Coupled-magnetic filters have been ...

Lymar, Daria S

2005-01-01T23:59:59.000Z

190

A microfabricated ElectroQuasiStatic induction turbine-generator  

E-Print Network (OSTI)

An ElectroQuasiStatic (EQS) induction machine has been fabricated and has generated net electric power. A maximum power output of 192 [mu]W at 235 krpm has been measured under driven excitation of the six phases. Self ...

Steyn, J. Lodewyk (Jasper Lodewyk), 1976-

2005-01-01T23:59:59.000Z

191

Development of magnetic induction machines for micro turbo machinery  

E-Print Network (OSTI)

This thesis presents the nonlinear analysis, design, fabrication, and testing of an axial-gap magnetic induction micro machine, which is a two-phase planar motor in which the rotor is suspended above the stator via mechanical ...

KöÅŸ er, Hür, 1976-

2002-01-01T23:59:59.000Z

192

Modelling of transformations during induction hardening and tempering  

E-Print Network (OSTI)

There are many circumstances in industry where steel components are locally heated into the austenite phase field, and then quenched rapidly to produce a hardened region. Induction hardening is one such process used widely in the manufacture...

Gaude-Fugarolas, Daniel

193

Tuning the DARHT Axis-II linear induction accelerator focusing  

SciTech Connect

Flash radiography of large hydrodynamic experiments driven by high explosives is a well-known diagnostic technique in use at many laboratories, and the Dual-Axis Radiography for Hydrodynamic Testing (DARHT) facility at Los Alamos produces flash radiographs of large hydrodynamic experiments. Two linear induction accelerators (LIAs) make the bremsstrahlung radiographic source spots for orthogonal views of each test. The 2-kA, 20-MeV Axis-I LIA creates a single 60-ns radiography pulse. The 1.7-kA, 16.5-MeV Axis-II LIA creates up to four radiography pulses by kicking them out of a longer pulse that has a 1.6-{mu}s flattop. The Axis-II injector, LIA, kicker, and downstream transport (DST) to the bremsstrahlung converter are described. Adjusting the magnetic focusing and steering elements to optimize the electron-beam transport through an LIA is often called 'tuning.' As in all high-current LIAs, the focusing field is designed to be as close to that of the ideal continuous solenoid as physically possible. In ideal continuous solenoidal transport a smoothly varying beam size can easily be found for which radial forces balance, and the beam is said to be 'matched' to the focusing field. A 'mismatched' beam exhibits unwanted oscillations in size, which are a source of free energy that contributes to emittance growth. This is undesirable, because in the absence of beam-target effects, the radiographic spot size is proportional to the emittance. Tuning the Axis-II LIA is done in two steps. First, the solenoidal focusing elements are set to values designed to provide a matched beam with little or no envelope oscillations, and little or no beam-breakup (BBU) instability growth. Then, steering elements are adjusted to minimize the motion of the centroid of a well-centered beam at the LIA exit. This article only describes the design of the tune for the focusing solenoids. The DARHT Axis-II LIA was required to be re-tuned after installing an accelerator cell to replace a failed solenoid in March of 2012. We took advantage of this opportunity to improve the design of the focusing tune with better models of the remaining partially failed solenoids, better estimates of beam initial conditions, and better values for pulsed-power voltages. As with all previous tunes for Axis-II, this one incorporates measures to mitigate beam-breakup (BBU) instability, image displacement instability (IDI), corkscrew (sweep), and emittance growth. Section II covers the general approach to of design of focusing solenoid tunes for the DARHT Axis-2 LIA. Section III explains the specific requirements and simulations needed to design the tune for the injector, which includes the thermionic electron source, diode, and six induction cells. Section IV explains the requirements and simulations for tuning the main accelerator, which consists of 68 induction cells. Finally, Section V explores sensitivity of the tune to deviations of parameters from nominal, random variations, and uncertainties in values. Four appendices list solenoid settings for this new tune, discuss comparisons of different simulation codes, show halo formation in mismatched beams, and present a brief discussion of the beam envelope equation, which is the heart of the method used to design LIA solenoid tunes.

Ekdahl, Carl A. [Los Alamos National Laboratory

2012-04-24T23:59:59.000Z

194

Inductively stabilized, long pulse duration transverse discharge apparatus  

DOE Patents (OSTI)

An inductively stabilized, long pulse duration transverse discharge apparatus. The use of a segmented electrode where each segment is attached to an inductive element permits high-energy, high-efficiency, long pulsed laser outputs to be obtained. The apparatus has been demonstrated with rare gas halide lasing media. Orders of magnitude increase in pulse repetition frequency are obtained in lasing devices that do not utilize gas flow.

Sze, R.C.

1983-09-01T23:59:59.000Z

195

Inductively stabilized, long pulse duration transverse discharge apparatus  

DOE Patents (OSTI)

An inductively stabilized, long pulse duration transverse discharge apparatus. The use of a segmented electrode where each segment is attached to an inductive element permits high energy, high efficiency, long-pulsed laser outputs to be obtained. The present apparatus has been demonstrated with rare-gas halide lasing media. Orders of magnitude increase in pulse repetition frequency are obtained in lasing devices that do not utilize gas flow.

Sze, Robert C. (Santa Fe, NM)

1986-01-01T23:59:59.000Z

196

Linear induction accelerator and pulse forming networks therefor  

DOE Green Energy (OSTI)

A linear induction accelerator includes a plurality of adder cavities arranged in a series and provided in a structure which is evacuated so that a vacuum inductance is provided between each adder cavity and the structure. An energy storage system for the adder cavities includes a pulsed current source and a respective plurality of bipolar converting networks connected thereto. The bipolar high-voltage, high-repetition-rate square pulse train sets and resets the cavities.

Buttram, Malcolm T. (Sandia Park, NM); Ginn, Jerry W. (Albuquerque, NM)

1989-01-01T23:59:59.000Z

197

High-current pulses from inductive energy stores  

SciTech Connect

Superconducting inductive energy stores can be used for high power pulse supplies if a suitable current multiplication scheme is used. The concept of an inductive Marx generator is superior to a transformer. A third scheme, a variable flux linkage device, is suggested; in multiplying current it also compresses energy. Its function is in many ways analogous to that of a horsewhip. Superconductor limits indicate that peak power levels of TW can be reached for stored energies above 1 MJ.

Wipf, S.L.

1981-01-01T23:59:59.000Z

198

Power reduction control for inductive lighting installation  

SciTech Connect

A control system for continuously, selectively reducing power consumption in an inductive lighting installation energized from an A.C. power source, the installation including at least one gas discharge lamp such as a fluorescent lamp energized through any of a plurality of different types of electromagnetic ballast having different harmonic distortion characteristics, the control system is described comprising: load energizing circuit means, including a signal-actuated normally-closed primary switch, for connecting an A.C. power source to the lighting installation; a signal-actuated, normally-open secondary switch connected in parallel with the lighting installation; actuation means for generating actuation signals and applying such actuation signals to the primary and secondary switches to actuate the primary switch open and to actuate the secondary switch closed in approximate time coincidence in each half-cycle of the A.C. power; zero-crossing detector means for generating zero-crossing signals at times TX indicative of zero-voltage transitions in the A.C. power; and program means, connected to the zero-crossing detector means and to the actuation means, programming the actuation means to generate (a) power reduction actuation signals at times T1 and T2 in each half-cycle of the A.C. power, (b) a first filter actuation signal at a time T3 prior to each zero-crossing time TX, and (c) a second filter actuation signal at a time T4 following each zero-crossing time TX; the program means including a plurality of programs each establishing a set of times T1, T2, T3 and T4 for several different power reduction levels for a particular type of ballast; and selection means for selecting a program to match the ballast type of the load.

Falk, K.R.

1993-06-22T23:59:59.000Z

199

Backstepping controller for Doubly Fed Induction Motor with bi-directional  

E-Print Network (OSTI)

studies focused in the study of wind energy conversion systems using doubly fed induction generator (DFIG

Paris-Sud XI, Université de

200

Fixed and variable speed induction generators for real power loss minimization  

Science Conference Proceedings (OSTI)

The application of induction generators in the wind power industry is standard practice. An induction generator draws reactive power from the network depending on its real power output, such that the greater the real power exported to the network, the ... Keywords: doubly- fed induction generator, induction generator, line loss, reactive power

S. Durairaj; D. Flynn; B. Fox

2008-02-01T23:59:59.000Z

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


201

Automatic induction of verb classes using clustering  

E-Print Network (OSTI)

and Shi, 2001) which consistently outperforms other previous methods in our studies. We also introduce a method to automatically de- tect the number of clusters for SPEC (Zelnik-Manor and Perona, 2004). In addition, we introduce HGFC (Yu et al., 2006) as a... and Shi, 2001) which consistently outperforms other previous methods in our studies. We also introduce a method to automatically de- tect the number of clusters for SPEC (Zelnik-Manor and Perona, 2004). In addition, we introduce HGFC (Yu et al., 2006) as a...

Sun, Lin

2013-04-30T23:59:59.000Z

202

Selective inductive powering system for paper computing  

Science Conference Proceedings (OSTI)

We present a method of selective wireless power transferring for paper computing. The novelty of this method lies in the power transmitter can be controlled to selectively activate different receivers in the context of wireless power transferring with ... Keywords: paper computing, selective wireless power

Kening Zhu; Hideaki Nii; Owen Noel Newton Fernando; Adrian David Cheok

2011-11-01T23:59:59.000Z

203

PU IMMOBILIZATION - INDUCTION MELTING ND OFFGAS TESTING  

SciTech Connect

The Cylindrical Induction Melter (CIM) at the Aiken County Technology Laboratory (ACTL) has been operated by the Savannah River National Laboratory (SRNL) to support the Pu Disposition Conceptual Design (CD-0) development effort. The primary purpose of this report is to summarize the offgas sampling tests conducted in the CIM to capture and analyze the particulate and vapors emitted from lanthanide borosilicate (LaBS) Frit X with HfO{sub 2} as a surrogate for PuO{sub 2} and added impurities. In addition, this report describes several initial tests of the CIM for the vitrification of LaBS Frit X with HfO{sub 2}. The activities required to produce Frit X from batch chemical oxides for subsequent milling to yield glass frit of nominally 20 micron particle size are also discussed. The tests with impurities added showed that alkali salts such as NaCl and KCl were substantially emitted into the offgas system as the salt particulate, HCl, or Cl{sub 2}. Retention of Na and K in the glass were about 80 and 55%, respectively. Chloride retention was about 35%; chloride remaining in the glass was 0.29-0.37 wt%. Based on a material balance, approximately 83% of F fed was retained in the glass at about 0.09 wt % (F could not be measured directly at this concentration). Transition metals (Ni, Cu, Fe, Mo, Cr) were also volatilized to varying extents. A very small amount (<0.1 g) of nickel compounds and KCl were found in crystals deposited on the melter offgas line. Overall, about 58-72% of the impurities added were volatilized. Virtually all of the particulate species were collected on the nominal 0.3 {micro}m filter. The particulate evolution rate ranged from 2-8 g/kg glass/h. The particulate was found to be as small as 0.2 {micro}m and have an approximate median size of 0.5 {micro}m. The particulate salt was also found to stick together by forming bridges between particles. Further runs without washable salts are recommended. Measurements of particle size distribution for use in offgas system design and tests of simple impingement devices for particle collection are also recommended for tests in the near future.

Marra, J

2006-11-28T23:59:59.000Z

204

NDCX-II PULSED POWER SYSTEM AND INDUCTION CELLS  

Science Conference Proceedings (OSTI)

The Heavy Ion Fusion Science Virtual National Laboratory (HIFS-VNL) is currently finalizing the design of NDCX-II, the second phase of the Neutralized Drift Compression Experiment, which will use an ion beam to explore Warm Dense Matter (WDM) and Inertial Fusion Energy (IFE) target hydrodynamics. The ion induction accelerator will include induction cells and Blumleins from the decommissioned Advanced Test Accelerator (ATA) at Lawrence Livermore National Laboratory (LLNL). A test stand has been built at Lawrence Berkeley National Laboratory (LBNL) to test refurbished ATA induction cells and pulsed power hardware for voltage holding and ability to produce various compression and acceleration waveforms. The performance requirements, design modifications, and test results will be presented.

Waldron, W.L.; Reginato, L.L.; Leitner, M.

2009-06-01T23:59:59.000Z

205

Soft Computing Application in Fault Detection of Induction Motor  

Science Conference Proceedings (OSTI)

The paper investigates the effectiveness of different patter classifier like Feed Forward Back Propagation (FFBPN), Radial Basis Function (RBF) and Support Vector Machine (SVM) for detection of bearing faults in Induction Motor. The steady state motor current with Park's Transformation has been used for discrimination of inner race and outer race bearing defects. The RBF neural network shows very encouraging results for multi-class classification problems and is hoped to set up a base for incipient fault detection of induction motor. SVM is also found to be a very good fault classifier which is highly competitive with RBF.

Konar, P.; Puhan, P. S.; Chattopadhyay, P. Dr. [Electrical Engineering Department, BESUS, Shibpur (India)

2010-10-26T23:59:59.000Z

206

Induction Linac Systems Experiments for heavy ion fusion  

Science Conference Proceedings (OSTI)

The Lawrence Berkeley Laboratory and the Lawrence Livermore National Laboratory propose to build at LBL the Induction Linac Systems Experiments (ILSE), the next logical step toward the eventual goal of a heavy ion induction accelerator powerful enough to implode or drive inertial confinement fusion targets. Though much smaller than a driver, ILSE will be at full driver scale in several important parameters. Nearly all accelerator components and beam manipulations required for a driver will be tested. It is expected that ILSE will be built in stages as funds and technical progress allow. The first stage, called Elise will include all of the electrostatic quadrupole focused parts of ILSE.

Herrmannsfeldt, W.B. [Stanford Linear Accelerator Center, Menlo Park, CA (United States); Bangerter, R.O. [Lawrence Berkeley Lab., CA (United States). Accelerator and Fusion Research Div.

1994-06-01T23:59:59.000Z

207

Apparatus and method for characterizing conductivity of materials  

DOE Patents (OSTI)

Apparatus and method for noncontact, radio-frequency shielding current characterization of materials. Self- or mutual inductance changes in one or more inductive elements, respectively, occur when materials capable of supporting shielding currents are placed in proximity thereto, or undergo change in resistivity while in place. Such changes can be observed by incorporating the inductor(s) in a resonant circuit and determining the frequency of oscillation or by measuring the voltage induced on a coupled inductive element. The present invention is useful for determining the critical temperature and superconducting transition width for superconducting samples. 8 figs.

Doss, J.D.

1988-04-13T23:59:59.000Z

208

Inductive Double-Contingency Analysis of UO2 Powder Bulk Blending Operations at a Commercial Fuel Plant (U)  

SciTech Connect

An inductive double-contingency analysis (DCA) method developed by the criticality safety function at the Savannah River Site, was applied in Criticality Safety Evaluations (CSEs) of five major plant process systems at the Westinghouse Electric Corporation`s Commercial Nuclear Fuel Manufacturing Plant in Columbia, South Carolina (WEC-Cola.). The method emphasizes a thorough evaluation of the controls intended to provide barriers against criticality for postulated initiating events, and has been demonstrated effective at identifying common mode failure potential and interdependence among multiple controls. A description of the method and an example of its application is provided.

Skiles, S. K. [Westinghouse Savannah River Company, Aiken, SC (United States)

1994-12-22T23:59:59.000Z

209

Atomic hydrogen reaction rates in aqueous solution via free-induction decay attenuation  

DOE Green Energy (OSTI)

This new pulsed EPR method is providing data on H-atom reaction rates in water, which are important in radiation chemistry of aqueous solutions, eg, corrosion in reactor cooling systems, H2 production in high-level radioactive waste, and spread of radioactive iodine following the Chernobyl accident. This AECL-Argonne collaborative effort was undertaken to investigate fundamental aqueous H-atom chemistry for the purpose of developing predictive models of iodine transport that will be used by the nuclear power industry to enhance plant safety. Reactions of (H){sub aq} with many representative organic and inorganicmolecules have already been investigated. Radiolysis of aqueous solns with 3-MeV electrons produces H atoms in high yield; in the free induction decay method, a powerful 30 ns microwave pulse is applied immediately following pulse radiolysis, creating a phase coherence of the H-atom electron spins that is detected in the pulsed EPR spectrometer as a damped cosine free induction decay (FID). Natural decay time of the spin coherence is many microseconds, but if a reaction partner for the H atoms is introduced, the FID becomes shorter, revealing the H reaction rate. Results of H atom reaction with benzene, methanol, periodate and periodic acid are discussed briefly.

Bartels, D.M.

1996-02-01T23:59:59.000Z

210

Annular linear induction pump with an externally supported duct  

DOE Patents (OSTI)

Several embodiments of an annular linear induction pump for pumping liquid metals are disclosed having the features of generally one pass flow of the liquid metal through the pump and an increased efficiency resulting from the use of thin duct walls to enclose the stator. The stator components of this pump are removable for repair and replacement.

Craig, Edwin R. (San Jose, CA); Semken, Robert S. (Idaho Falls, ID)

1979-01-01T23:59:59.000Z

211

Inductively heated particulate matter filter regeneration control system  

Science Conference Proceedings (OSTI)

A system includes a particulate matter (PM) filter with an upstream end for receiving exhaust gas, a downstream end and zones. The system also includes a heating element. A control module selectively activates the heating element to inductively heat one of the zones.

Gonze, Eugene V; Paratore Jr., Michael J; Kirby, Kevin W; Phelps, Amanda; Gregoire, Daniel J

2012-10-23T23:59:59.000Z

212

Integration of induction generator dynamics in multimachine system transient analysis  

Science Conference Proceedings (OSTI)

The impact of electrical transients of asynchronous wind generators on the synchronous generators is often ignored to keep the analysis of multimachine systems simple. A steady drift of slip from the nominal value, while of no consequence from power ... Keywords: dynamic modeling of wind systems, induction generator, power system, wind generation

A. H. M. A. Rahim; E. P. Nowicki

2010-07-01T23:59:59.000Z

213

Fundamentals of Electric Power Conversion: Volume 1: Operating Characteristics and Testing of AC Induction Motors  

Science Conference Proceedings (OSTI)

The prominence of ac motor-driven systems in the energy consumption field has made them the target of numerous efficiency improvements. This report describes how induction motors work, explains their characteristics, and discusses induction motor testing.

1999-11-18T23:59:59.000Z

214

The Study of Electromagnetic Field Response Using Very Low Frequency Methods in Geothermal Area, Sabang  

SciTech Connect

Electromagnetic field measurements have been performed using the method of Very Low Frequency tilt angle pattern in Jaboi, Sabang. A site survey was conducted and carried out to identify the anomalies of location, depth and geometry of hydrothermal based on tilt angle measurement and ellipse. Objective of this study is to see the response of the magnetic and electric field in relation to location, depth and hydrothermal geometry. The devices of T-VLF-R IRIS was used in this study, while the (NWC) station was selected as main station and (JJF4) station was selected as comparison station. The electromagnetic field survey was recorded for a line spanned as long as 900 meters at the interval of 10 meter depth. The results of this study show the greatest anomaly occurred at line interval between 400-600 meters with a depth of 10-140 meters. Anomaly pattern of each depth shows that the propagation pattern of hydrothermal is in the form of vertical pipe flow.

Isa, M. [Departement of Physics Syiah Kuala University Banda Aceh, 23111 (Indonesia); School of Physics, Universiti Sains Malaysia 11800, Penang (Malaysia); Lim, H. S.; Jafri, M. Z. Mat [School of Physics, Universiti Sains Malaysia 11800, Penang (Malaysia)

2011-03-30T23:59:59.000Z

215

Optimization of direct drive induction motors for electric ship propulsion with high speed propellers  

Science Conference Proceedings (OSTI)

Direct drive electric ship propulsion can offer increased flexibility and reduced overall fuel consumption compared to geared mechanical systems [Davis 1987, Doerry 2007]. As a well-established technology, induction motors are a dependable and economical ... Keywords: AC motors, induction motor drives, induction motors, thermal analysis

S. C. Englebretson; J. L. Kirtley, Jr; C. Chryssostomidis

2009-07-01T23:59:59.000Z

216

Application of genetic algorithms for optimal reactive power planning of doubly fed induction generators  

Science Conference Proceedings (OSTI)

This paper describes optimal reactive power control of a doubly fed induction generator (DFIG), which is widely used in a distributed generating plant. Although its structure is similar to that of induction motors, its reactive power control is more ... Keywords: doubly fed induction generator, genetic algorithms, optimal reactive power planning, optimization

P. Sangsarawut; A. Oonsivilai; T. Kulworawanichpong

2010-03-01T23:59:59.000Z

217

Optimal reactive power planning of doubly fed induction generators using genetic algorithms  

Science Conference Proceedings (OSTI)

This paper describes optimal reactive power control of a doubly fed induction generator (DFIG), which is widely used in a distributed generating plant. Although its structure is similar to that of an induction motor, its reactive power control is more ... Keywords: doubly fed induction generator, genetic algorithms, optimal reactive power planning, optimization

P. Sangsarawut; A. Oonsivilai; T. Kulworawanichpong

2010-02-01T23:59:59.000Z

218

Test of the performance and characteristics of a prototype inductive power coupling for electric highway systems  

DOE Green Energy (OSTI)

Development of an inductively coupled power system for highway applications was begun in 1976. The power system was designed to provide energy to vehicles that also carry a supply of stored energy, thus providing a large measure of operational flexibility to the vehicles and reducing the necessary inventory of powered roadways. The highway power system can support the high-speed, long-range portions of driving cycles, while the stored energy can meet the requirements of driving on non-powered streets. The system thus has been referred to as a ''dual-mode'' system because of the use of the two sources of energy. The results of testing a prototype coupling are presented. No physical contact between the vehicle and the power source is required, i.e., the coupling magnetically links the power system of the vehicle to a power source in the roadway (inductive coupling). Tests were performed to determine the magnetic force and flux distribution, electrical characteristics, thermal efforts and acoustic noise. The test equipment and methods are discussed. The tests confirmed the technical feasibility of this type of non-contacting electrical power coupling, and demonstrated that its components are suited to ordinary materials and manufacturing processes. The test results were found to be consistent with expected characteristics in all important respects.

Bolger, J.G.; Ng, L.S.; Green, M.I.; Wallace, R.I.

1978-07-01T23:59:59.000Z

219

Low Dose Radiation Research Program: Induction of Genomic Instability in  

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

Induction of Genomic Instability in vivo by Low Doses of 137Cs y Induction of Genomic Instability in vivo by Low Doses of 137Cs y rays, Authors: K. Rithidech1, E.B. Whorton2, M. Tungjai1, E. Ar-Bab1, S.R. Simon1, M. Tawde3 and C.W. Anderson3. Institutions: 1Pathology Department, Stony Brook University, NY 11794-8691, USA, 2University of Texas Medical Branch at Galveston, TX 77550-1047,3Biology Department, Brookhaven National Laboratory, Upton, NY 11973-5000. Information on potential health hazards of radiation at doses below or equal to the level traditionally requiring human radiation protection (less than or equal to 10 cGy) is currently lacking. It is therefore important to characterize early and subsequent in vivo biological response induced by low doses of ionizing radiation because such data should provide information that can help determine whether radiation at this dose level

220

Seismic baseline and induction studies- Roosevelt Hot Springs, Utah and  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Seismic baseline and induction studies- Roosevelt Hot Springs, Utah and Raft River, Idaho Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Seismic baseline and induction studies- Roosevelt Hot Springs, Utah and Raft River, Idaho Details Activities (2) Areas (2) Regions (0) Abstract: Local seismic networks were established at the Roosevelt Hot Springs geothermal area, utah and at Raft River geothermal area, Idaho to monitor the background seismicity prior to initiation of geothermal power production. The Raft River study area is currently seismically quiet down

Note: This page contains sample records for the topic "vlf induction method" 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

Post-pruning in regression tree induction: An integrated approach  

Science Conference Proceedings (OSTI)

The regression tree (RT) induction process has two major phases: the growth phase and the pruning phase. The pruning phase aims to generalize the RT that was generated in the growth phase by generating a subtree that avoids over-fitting to the training ... Keywords: Analytic hierarchy process, Data mining, Decision tree, Mixed integer programming, Multi-objective programming, Performance measures, Post-pruning, Regression tree

Kweku-Muata Osei-Bryson

2008-02-01T23:59:59.000Z

222

Application of kinetic inductance thermometers to x-ray calorimetry  

SciTech Connect

A kinetic inductance thermometer is applied to x-ray calorimetry, and its operation over a wide range of frequencies and geometries is discussed. Three amplifier configurations are described, one using a superconducting quantum interference device (SQUID) amplifier, another incorporating an FET amplifier in an amplitude modulated system, and the third, using a tunnel diode frequency modulated oscillator circuit. The predicted performance of each configuration is presented. 13 refs., 6 figs., 1 tab.

Wai, Y.C.; Labov, S.E.; Silver, E.H.

1990-08-13T23:59:59.000Z

223

Calculation of Unbalanced Magnetic Pull in Cage Induction Machines  

E-Print Network (OSTI)

. . . . . . . . . . . . . .. 58 4.4 Rotor Resistance and Leakage Inductance ............... 58 4.5 Carter Factor Correction . . . . . . . . . . . . . . . . . . . . . . . .. 59 9 61 5 Experimental Equipment 5.1 Introduction... only the forces normal to the surface which are considered, the tangential component being assumed negligible. There is also the case of unbalanced magnetic push [24][25], where conductors are pushed towards the bottom of a slot. Again...

Dorrell, David George

1993-10-26T23:59:59.000Z

224

Analytical Method of Torque Calculation for Interior Permanent Magnet Synchronous Machines  

E-Print Network (OSTI)

method for performing the output torque calculations of an interior permanent magnet synchronous motor circuit, inductance, permanent magnet machine, synchronous motors, torque. I. NOMENCLATURE BFE brushless field excitation IPMSM interior permanent magnet synchronous motor FEA finite element analysis mmf

Tolbert, Leon M.

225

Non-linear analysis of advanced high-phase number induction machines for adjustable speed drive applications  

E-Print Network (OSTI)

This study focuses on the effect of high order phases on electrical machines' parameters and performance. A general approach has been conducted using the induction motor equivalent circuit, winding function and conventional design methods. This approach was supported with finite element analysis. The study shows that high order phase machines have higher peak torque than the equivalent three phase machines. This is attributed to the lower leakage inductance that decreases as the number of phases increases. However, the peak slip frequency increases causing an increase in the skin effect and losses of the rotor. Some design suggestions are proposed to resolve this issue. The conducted harmonic analysis shows that high order harmonics (3rd, 5th, ..) that generate pulsating torque in the three phase machine can be used in high order phase machines to generate torque. For this purpose, a multiphase coordinate transformation and a revised dq model of the five phase induction motor under the fundamental and third harm,monic currents are established in a newly defined d?q?d?q?n reference frame. An extensive analysis using the finite element package has been conducted to compare the performance of different machines when supplied with quasi-rectangular currents with concentrated windings. From torque per ampere point of view, five-phase machine shows an outstanding performance compared with other machines. Futhermore, additional analysis has been conducted for the five-phase and three-phase machines when supplied with sinusoidal voltage source. Experiments have been performed on a 7.5hp five-phase induction motor using TMS320C32 DSP to systematically test and compare stator tooth flux densities and torques in the presence and absence of third harmonic currents. The results obtained are consistent with theoretical studies and simulation analysis, which further demonstrate the feasibility and practical significance of the high-order phase machines.

Qahtany, Nasser H.

2002-01-01T23:59:59.000Z

226

Metallurgical Evaluation of the Five-Inch Cylindrical Induction Melter  

SciTech Connect

A metallurgical evaluation of the 5-inch cylindrical induction melter (CIM) vessel was performed by the Materials Technology Section to evaluate the metallurgical condition after operating for approximately 375 hours at 1400 to 1500 Degrees Celsius during a 2 year period. Results indicate that wall thinning and significant grain growth occurred in the lower portion of the conical section and the drain tube. No through-wall penetrations were found in the cylindrical and conical sections of the CIM vessel and only one leak site was identified in the drain tube. Failure of the drain tube was associated with a localized over heating and intercrystalline fracture.

Imrich, K.J.

2000-08-15T23:59:59.000Z

227

Surface moisture measurement system electromagnetic induction probe calibration technique  

SciTech Connect

The Surface Moisture Measurement System (SMMS) is designed to measure the moisture concentration near the surfaces of the wastes located in the Hanford Site tank farms. This document describes a calibration methodology to demonstrate that the Electromagnetic Induction (EMI) moisture probe meets relevant requirements in the `Design Requirements Document (DRD) for the Surface Moisture Measurement System.` The primary purpose of the experimental tests described in this methodology is to make possible interpretation of EMI in-tank surface probe data to estimate the surface moisture.

Crowe, R.D., Westinghouse Hanford

1996-07-08T23:59:59.000Z

228

Analysis of Thermal Induction Plasmas between Coaxial Cylinders  

Science Conference Proceedings (OSTI)

A previously derived approximate solution of the one?dimensional energy?balance equation for steady thermal induction plasmas is applied to the case of an annular plasma contained between coaxial cylinders. It is assumed that heat conduction is the only loss mechanism and that both walls are at zero temperature. Charted material is presented to facilitate determination of heat loads to either wall and calculation of temperature distributions across the gap. Results for an atmospheric?pressure argon discharge are compared with both exact numerical calculations and with experimental data. With the former

H. U. Eckert

1972-01-01T23:59:59.000Z

229

Fission Yield Measurements by Inductively Coupled Plasma Mass-Spectrometry  

SciTech Connect

Correct prediction of the fission products inventory in irradiated nuclear fuels is essential for accurate estimation of fuel burnup, establishing proper requirements for spent fuel transportation and storage, materials accountability and nuclear forensics. Such prediction is impossible without accurate knowledge of neutron induced fission yields. Unfortunately, the accuracy of the fission yields reported in the ENDF/B-VII.0 library is not uniform across all of the data and much of the improvement is desired for certain isotopes and fission products. We discuss our measurements of cumulative fission yields in nuclear fuels irradiated in thermal and fast reactor spectra using Inductively Coupled Plasma Mass Spectrometry.

Irina Glagolenko; Bruce Hilton; Jeffrey Giglio; Daniel Cummings; Karl Grimm; Richard McKnight

2009-11-01T23:59:59.000Z

230

Inductively coupled plasma torch with laminar flow cooling  

DOE Patents (OSTI)

An improved inductively coupled gas plasma torch. The torch includes inner and outer quartz sleeves and tubular insert snugly fitted between the sleeves. The insert includes outwardly opening longitudinal channels. Gas flowing through the channels of the insert emerges in a laminar flow along the inside surface of the outer sleeve, in the zone of plasma heating. The laminar flow cools the outer sleeve and enables the torch to operate at lower electrical power and gas consumption levels additionally, the laminar flow reduces noise levels in spectroscopic measurements of the gaseous plasma.

Rayson, Gary D. (Las Cruces, NM); Shen, Yang (Las Cruces, NM)

1991-04-30T23:59:59.000Z

231

Thin film coating process using an inductively coupled plasma  

DOE Patents (OSTI)

Thin coatings of normally solid materials are applied to target substrates using an inductively coupled plasma. Particles of the coating material are vaporized by plasma heating, and pass through an orifice to a first vacuum zone in which the particles are accelerated to a velocity greater than Mach 1. The shock wave generated in the first vacuum zone is intercepted by the tip of a skimmer cone that provides a second orifice. The particles pass through the second orifice into a second zone maintained at a higher vacuum and impinge on the target to form the coating. Ultrapure coatings can be formed.

Kniseley, Richard N. (Ames, IA); Schmidt, Frederick A. (Ames, IA); Merkle, Brian D. (Ames, IA)

1990-01-30T23:59:59.000Z

232

Ind Heat WS Code - Cost Comparison Worksheet for Induction Heating, Version 1.0  

Science Conference Proceedings (OSTI)

The Induction Heating for Melting for Aluminum / Steel Cost Comparison Worksheet is a tool that enables the comparison of induction heating for metals melting with more conventional melting technologies such as gas crucible, electric resistance, and electric arc furnaces. Note that this analysis only considers melting of scrap metal, as this application would appear to be the most practical and cost-effective utilization of the induction heating technology. A cost comparison is provided for the two most ...

2001-05-29T23:59:59.000Z

233

Coupled simulation of an indirect field oriented controlled induction motor drive.  

E-Print Network (OSTI)

??Conventionally, system simulations of induction motor drives use lumped parameters model of the motor. This approach assumes motor parameters to be constant during the entire… (more)

Legesse, Michael.

2008-01-01T23:59:59.000Z

234

Induction Heating Stress Improvement Effectiveness on Crack Growth in Operating Plants (BWRVIP-61)  

Science Conference Proceedings (OSTI)

New reports of intergranular stress corrosion cracking prompted this review of factors that could influence the performance of the pipe cracking remedy known as induction heating stress improvement.

1999-01-27T23:59:59.000Z

235

Fault detection of fault ride through for doubly-fed induction generator based wind energy systems.  

E-Print Network (OSTI)

??Fault detection and mitigation is of high importance for existing DFIG based wind energy conversion systems. Keeping the doubly-fed induction generator (DFIG) online during faults… (more)

Ramroop, Shoba AD

2008-01-01T23:59:59.000Z

236

Vital Alert's C1000 mine and tunnel radios use magnetic induction...  

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

Vital Alert's C1000 mine and tunnel radios use magnetic induction, advanced digital communications techniques and ultra-low frequency transmission to wirelessly provide...

237

Wind turbine power generation emulation via doubly fed induction generator control .  

E-Print Network (OSTI)

??In this thesis, we emulate a Wind Turbine Generator by driving a Doubly Fed Induction Generator (DFIG) via a DC motor with variable input torque… (more)

Edwards, Gregory W.

2009-01-01T23:59:59.000Z

238

Control design and analysis of doubly-fed induction generator in wind power application.  

E-Print Network (OSTI)

??The work presented in this thesis includes control system design, analysis and grid synchronization of a DFIG (doubly-fed induction generator) driven by a wind turbine… (more)

Mazari, Shukul

2009-01-01T23:59:59.000Z

239

Adaptive control and parameter identification of a doubly-fed induction generator for wind power .  

E-Print Network (OSTI)

??The use of Doubly-Fed Induction Generators (DFIG) for wind energy conversion is addressed in this thesis. It is well known that when the stator is… (more)

Orfanos-Pepainas, Stamatios

2011-01-01T23:59:59.000Z

240

Felix Bloch, Nuclear Induction, Bloch Equations, Bloch Theorem, Bloch  

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

Felix Bloch, Nuclear Induction, and Bloch Equations Felix Bloch, Nuclear Induction, and Bloch Equations Resources with Additional Information Stressing "the importance both of demonstrating the neutron's magnetic moment and of determining its magnitude", Felix Bloch began his research on neutron physics at Stanford [University] in early 1936. "Using mostly X-ray and microwave equipment from the physics labs, he and Norris Bradbury ... built [a neutron] source ... . (Bloch later pointed out that this equipment was more important as a source of inspiration than of neutrons.) Eventually, he extended his use of neutron sources to studies of neutron polarisation, a link to his earlier research in ferromagnetism. Felix Bloch Courtesy Stanford University Archives These studies served as a basis for a collaborative effort with Luis Alvarez ... . In the fall of 1938, Alvarez and Bloch began working with Berkeley's 37" cyclotron to determine the magnetic moment of the neutron. ... By the summer of 1939 ... they were able to publish very precise results. This experiment was, in fact, one of the first important uses of Ernest Lawrence's cyclotron. ..

Note: This page contains sample records for the topic "vlf induction method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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241

Induction of DNA Damage by Low Dose PET scans  

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

Induction of DNA Damage by Low Dose PET scans Induction of DNA Damage by Low Dose PET scans Douglas Boreham McMaster University Abstract This research is focused on assessing the radiation risk associated with positron emission tomography (PET) scans. It has been suggested that low dose medical imaging, such as PET scans, carry an added biological risk because they expose the patient to ionizing radiation. PET scanning is an increasingly used nuclear medicine procedure that requires the administration of isotope 18F-fluorodeoxyglucose (18F-FDG, E=250 keV β and 511 keV γ) and results in an effective dose to the patient ranging from 7-22 mSv. The radiation induced DNA damage associated with a PET scan was studied in 7-9 week old female wild type Trp53 +/+ mice. Mice were given a PET scan with 18F-FDG and the biological response was assessed in bone marrow using

242

Low-pressure water-cooled inductively coupled plasma torch  

DOE Patents (OSTI)

An inductively coupled plasma torch is provided which comprises an inner tube, including a sample injection port to which the sample to be tested is supplied and comprising an enlarged central portion in which the plasma flame is confined; an outer tube surrounding the inner tube and containing water therein for cooling the inner tube, the outer tube including a water inlet port to which water is supplied and a water outlet port spaced from the water inlet port and from which water is removed after flowing through the outer tube; and an rf induction coil for inducing the plasma in the gas passing into the tube through the sample injection port. The sample injection port comprises a capillary tube including a reduced diameter orifice, projecting into the lower end of the inner tube. The water inlet is located at the lower end of the outer tube and the rf heating coil is disposed around the outer tube above and adjacent to the water inlet.

Seliskar, C.J.; Warner, D.K.

1984-02-16T23:59:59.000Z

243

Series-counterpulse repetitive-pulse inductive storage circuit  

DOE Patents (OSTI)

A high-power series-counterpulse repetitive-pulse inductive energy storage and transfer circuit includes an opening switch, a main energy storage coil, and a counterpulse capacitor. The load pulse is initiated simultaneously with the initiation of the counterpulse which is used to turn the opening switch off. There is no delay from command to output pulse. During the load pulse, the counterpulse capacitor is first discharged and then recharged in the opposite polarity with sufficient energy to accomplish the load counterpulse which terminates the load pulse and turns the load switch off. When the main opening switch is triggered closed again to terminate the load pulse, the counterpulse capacitor discharges in the reverse direction through the load switch and through the load, causing a rapid, sharp cutoff of the load pulse as well as recovering any energy remaining in the load inductance. The counterpulse capacitor is recharged to its original condition by the main energy storage coil after the load pulse is over, not before it begins.

Honig, Emanuel M. (Los Alamos, NM)

1986-01-01T23:59:59.000Z

244

Low-pressure water-cooled inductively coupled plasma torch  

DOE Patents (OSTI)

An inductively coupled plasma torch is provided which comprises an inner tube, including a sample injection port to which the sample to be tested is supplied and comprising an enlarged central portion in which the plasma flame is confined; an outer tube surrounding the inner tube and containing water therein for cooling the inner tube, the outer tube including a water inlet port to which water is supplied and a water outlet port spaced from the water inlet port and from which water is removed after flowing through the outer tube; and an r.f. induction coil for inducing the plasma in the gas passing into the tube through the sample injection port. The sample injection port comprises a capillary tube including a reduced diameter orifice, projecting into the lower end of the inner tube. The water inlet is located at the lower end of the outer tube and the r.f. heating coil is disposed around the outer tube above and adjacent to the water inlet.

Seliskar, Carl J. (Cincinnati, OH); Warner, David K. (Centerville, OH)

1988-12-27T23:59:59.000Z

245

DC switching regulated power supply for driving an inductive load  

DOE Patents (OSTI)

A power supply for driving an inductive load current from a dc power supply hrough a regulator circuit including a bridge arrangement of diodes and switching transistors controlled by a servo controller which regulates switching in response to the load current to maintain a selected load current. First and second opposite legs of the bridge are formed by first and second parallel-connected transistor arrays, respectively, while the third and fourth legs of the bridge are formed by appropriately connected first and second parallel connected diode arrays, respectively. The regulator may be operated in three "stages" or modes: (1) For current runup in the load, both first and second transistor switch arrays are turned "on" and current is supplied to the load through both transistor arrays. (2) When load current reaches the desired level, the first switch is turned "off", and load current "flywheels" through the second switch array and the fourth leg diode array connecting the second switch array in series with the load. Current is maintained by alternating between modes 1 and 2 at a suitable duty cycle and switching rate set by the controller. (3) Rapid current rundown is accomplished by turning both switch arrays "off", allowing load current to be dumped back into the source through the third and fourth diode arrays connecting the source in series opposition with the load to recover energy from the inductive load. The three operating states are controlled automatically by the controller.

Dyer, George R. (Norris, TN)

1986-01-01T23:59:59.000Z

246

Methods Disclaimer  

Science Conference Proceedings (OSTI)

The American Oil Chemists' Society makes no warranty as to the safety of the methods contained herein Methods Disclaimer Official Methods and Recommended Practices of the AOCS (Methods) aocs applicants certified chemist chemists fats lab laborator

247

Inductive and Electrostatic Acceleration in Relativistic Jet-Plasma Interactions  

Science Conference Proceedings (OSTI)

We report on the observation of rapid particle acceleration in numerical simulations of relativistic jet-plasma interactions and discuss the underlying mechanisms. The dynamics of a charge-neutral, narrow, electron-positron jet propagating through an unmagnetized electron-ion plasma was investigated using a three-dimensional, electromagnetic, particle-in-cell computer code. The interaction excited magnetic filamentation as well as electrostatic (longitudinal) plasma instabilities. In some cases, the longitudinal electric fields generated inductively and electrostatically reached the cold plasma wave-breaking limit, and the longitudinal momentum of about half the positrons increased by 50% with a maximum gain exceeding a factor of two. The results are relevant to understanding the micro-physics at the interface region of an astrophysical jet with the interstellar plasma, for example, the edge of a wide jet or the jet-termination point.

Ng, Johnny S.T.; Noble, Robert J.; /SLAC

2005-07-13T23:59:59.000Z

248

MAGNETIC EXPLOSIONS: ROLE OF THE INDUCTIVE ELECTRIC FIELD  

Science Conference Proceedings (OSTI)

Inclusion of the inductive electric field, E{sub ind}, due to the temporally changing B, in magnetic explosions is discussed, with emphasis on solar flares. Several roles played by E{sub ind} are identified: on a global scale, E{sub ind} produces the electromotive force that drives the explosion; the associated E{sub ind} Multiplication-Sign B drift is identified with the inflow of magnetic field lines into a reconnection region; the polarization current, associated with {partial_derivative}E{sub ind}/{partial_derivative}t, implies a J Multiplication-Sign B force that accelerates this inflow; and the component of E{sub ind} parallel to B accelerates the energetic electrons that cause hard X-ray emission and type III radio bursts. Some simple models that describe these effects are presented. A resolution of the long-standing 'number problem' in solar flares is suggested.

Melrose, D. B. [Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006 (Australia)

2012-04-10T23:59:59.000Z

249

Gas insulated transmission line having low inductance intercalated sheath  

DOE Patents (OSTI)

A gas insulated transmission line including an outer sheath, an inner conductor disposed within the outer sheath, and an insulating gas between the inner conductor and the outer sheath. The outer sheath comprises an insulating tube having first and second ends, and having interior and exterior surfaces. A first electrically conducting foil is secured to the interior surface of the insulating tube, is spirally wound from one tube end to the second tube end, and has a plurality of overlapping turns. A second electrically conducting foil is secured to the exterior surface of the insulating tube, and is spirally wound in the opposite direction from the first electrically conducting foil. By winding the foils in opposite directions, the inductances within the intercalated sheath will cancel each other out.

Cookson, Alan H. (Southboro, MA)

1978-01-01T23:59:59.000Z

250

Inertial and inductive energy storage for fusion systems  

DOE Green Energy (OSTI)

Energy storage is necessary for all proposed fusion reactor systems. The plasma physics for confinement and primarily the energy transfer time determine the nature of the storage system. Discharge times vary from 0.7 ms for theta-pinch reactors to one to two seconds for tokamak reactors. Three classes of devices are available for energy storage--inductors, capacitors, and rotating machines. The transfer of the energy from the store imposes unusual switching requirements. The broad requirements for reactor energy stores and more specifically those for tokamak experimental power reactors (EPR) and for the Scyllac fusion test reactor (SFTR) will be presented. Assessments and comparisons of alternative energy storage and transfer systems for these devices are to be discussed. The state of the pulsed superconducting inductive energy storage coils and homopolar development programs will be emphasized. Plans for tokamak ohmic-heating systems will be discussed briefly.

Rogers, J.D.

1976-01-01T23:59:59.000Z

251

Element for use in an inductive coupler for downhole components  

DOE Patents (OSTI)

An element for use in an inductive coupler for downhole components comprises an annular housing having a generally circular recess. The element further comprises a plurality of generally linear, magnetically conductive segments. Each segment includes a bottom portion, an inner wall portion, and an outer wall portion. The portions together define a generally linear trough from a first end to a second end of each segment. The segments are arranged adjacent to each other within the housing recess to form a generally circular trough. The ends of at least half of the segments are shaped such that the first end of one of the segments is complementary in form to the second end of an adjacent segment. In one embodiment, all of the ends are angled. Preferably, the first ends are angled with the same angle and the second ends are angled with the complementary angle.

Hall, David R. (Provo, UT); Fox, Joe (Spanish Fork, UT)

2009-03-31T23:59:59.000Z

252

Farm scale biogas-fueled engine/induction generator system  

Science Conference Proceedings (OSTI)

A 3.6 liter spark ignition engine coupled to an induction generator produced 21 kW of electric power at 1260 rpm operating on biogas (55% methane, 45% carbon dioxide). Power output increased by 3.55 kW for a 10 rpm increase in shaft speed. Operating at over 16 kW output, power factor was greater than .8 and generator efficiency was greater than 85%. Engine operation is insensitive to small changes in spark advance. Recommended spark advance for a biogas engine is about 45/sup 0/. Minimum brake specific fuel consumption of 270 g CH/sub 4//kWh occurs at a manifold vacuum of 5 cmHg and an equivalence ratio in the range of .6 to .8.

Stahl, T.; Fischer, J.R.; Harris, F.D.

1982-12-01T23:59:59.000Z

253

Forward and reverse control system for induction motors  

DOE Patents (OSTI)

A control system for controlling the direction of rotation of a rotor of an induction motor includes an array of five triacs with one of the triacs applying a current of fixed phase to the windings of the rotor and four of the triacs being switchable to apply either hot ac current or return ac current to the stator windings so as to reverse the phase of current in the stator relative to that of the rotor and thereby reverse the direction of rotation of the rotor. Switching current phase in the stator is accomplished by operating the gates of pairs of the triacs so as to connect either hot ac current or return ac current to the input winding of the stator. 1 fig.

Wright, J.T.

1987-09-15T23:59:59.000Z

254

An Advanced simulation Code for Modeling Inductive Output Tubes  

Science Conference Proceedings (OSTI)

During the Phase I program, CCR completed several major building blocks for a 3D large signal, inductive output tube (IOT) code using modern computer language and programming techniques. These included a 3D, Helmholtz, time-harmonic, field solver with a fully functional graphical user interface (GUI), automeshing and adaptivity. Other building blocks included the improved electrostatic Poisson solver with temporal boundary conditions to provide temporal fields for the time-stepping particle pusher as well as the self electric field caused by time-varying space charge. The magnetostatic field solver was also updated to solve for the self magnetic field caused by time changing current density in the output cavity gap. The goal function to optimize an IOT cavity was also formulated, and the optimization methodologies were investigated.

Thuc Bui; R. Lawrence Ives

2012-04-27T23:59:59.000Z

255

Advanced test accelerator: a high-current induction linac  

SciTech Connect

The Advanced Test Accelerator (ATA) is a linear induction accelerator being built at Lawrence Livermore National Laboratory. The aim of the ATA, together with its associated physics program is the research and development necessary to resolve whether particle-beam propagation is possible. Since the accelerator is the tool needed to do the basic propagation experiment, many of its design parameters are specified by the physics. The accelerator parameters are: 50 MeV, 10 kA, 70 ns pulse width (FWHM), and a 1 kHz rep-rate during a ten-pulse burst. In addition, beam quality and pulse-to-pulse repeatability must be excellent. The unique features of the accelerator are the 10 kA beam and the 1 kHz burst frequency.

Cook, E.G.; Birx, D.L.; Reginato, L.L.

1982-11-01T23:59:59.000Z

256

Effects of Capcitor Bank on Fault Ride Through Capibility of Induction Generator Hu, Y; Chen, Zhe  

E-Print Network (OSTI)

Effects of Capcitor Bank on Fault Ride Through Capibility of Induction Generator Hu, Y; Chen, Zhe Published in: Proceedings of the Asia-Pacific Power and Energy Engineering Conference, APPEEC 2010 DOI: 10., & Chen, Z. (2010). Effects of Capcitor Bank on Fault Ride Through Capibility of Induction Generator Based

Chen, Zhe

257

Autonomous induction generator/rectifier as regulated DC power supply for hybrid renewable energy systems  

Science Conference Proceedings (OSTI)

The present article deals with the wind power-generating unit of a Hybrid Photovoltaic-Wind Renewable Energy System (HPVWRES). The dynamic flux model of the self-excited induction generator used in the wind power-generating unit is given. This model, ... Keywords: experimental investigation, hybrid, induction generator, modeling, rectifier, regulation, renewable Energy

A. Nesba; R. Ibtiouen; S. Mekhtoub; O. Touhami; N. Takorabet

2005-10-01T23:59:59.000Z

258

Timescales for NonInductive Current Buildup In LowAspectRatio Toroidal Geometry  

E-Print Network (OSTI)

boundary conditions coupled to the changing currents in the poloidal field coils. For definiteness in the magnetic field evolution equation whereas non­inductive current drive takes the form of a source term. An associated and compounding effect is that inductive current drive changes the plasma flux most near

259

Time-scales for Non-Inductive Current Buildup In Low-Aspect-Ratio Toroidal Geometry  

E-Print Network (OSTI)

boundary conditions coupled to the changing currents in the poloidal field coils. For definiteness in the magnetic field evolution equation whereas non-inductive current drive takes the form of a source term. An associated and compounding effect is that inductive current drive changes the plasma flux most near

260

Modelling and Analysis of Variable Speed Wind Turbines with Induction Generator during Grid  

E-Print Network (OSTI)

Modelling and Analysis of Variable Speed Wind Turbines with Induction Generator during Grid Fault Wind Turbines with Induction Generator during Grid Fault by Sigrid M. Bolik Institute of Energy turbine technology has undergone rapid developments. Growth in size and the optimization of wind turbines

Hansen, René Rydhof

Note: This page contains sample records for the topic "vlf induction method" 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

Guided Exploration: an Inductive Minimalist Approach for Teaching Tool-related Concepts and Techniques  

Science Conference Proceedings (OSTI)

In this paper we introduce Guided Exploration as an inductive teaching approach. It is based on Minimalism and makes use of the pattern format. Guided Exploration addresses a couple of problems when teaching tool-related concepts and techniques, like ... Keywords: Educational Patterns, Inductive Teaching, Learning Styles

Christian Köppe, Rick Rodin

2013-04-01T23:59:59.000Z

262

Influence of voltage drop to electric drive with induction motor and voltage sourced inverter  

Science Conference Proceedings (OSTI)

This paper solves problematic of immunity from the voltage drop of the power supply of the electric drive with induction motor with Voltage-Fed inverter. There are reflected opportune control algorithms for the quickly to change of working regime from ... Keywords: electric drive with induction motor, electric drive with voltage sourced inverter, voltage drop

P. Beneš; J. Fo?t; M. Pittermann

2011-09-01T23:59:59.000Z

263

Simulation for Performance Analysis of Grid-Connected Induction Generators with Input Voltage Control  

Science Conference Proceedings (OSTI)

With the increasing application of wind energy, various technologies are developed for analyzing the performance of grid-connected induction generator (GIG) based wind energy conversion systems (WECSs). Input voltage control is one among them. In the ... Keywords: grid-connected induction generators (GIGs), wind energy conversion systems (WECSs), input voltage control, performance analysis, MATLAB

Farhad Ilahi Bakhsh, Shirazul Islam, Sayeed Ahmad

2013-04-01T23:59:59.000Z

264

Transient States of the Multiscalar Controlled Double Fed Induction Generator in the Wind Farm  

Science Conference Proceedings (OSTI)

This article presents a detailed model and analysis of wind turbine based on double fed induction generator (DFIG) including cable line to the point of common coupling (PCC). The vector control system is based on the multiscalar model of the machine. ... Keywords: Double Fed Induction Generator, Multiscalar Control, Reactive Power Compensation, Wind Farm Modelling

Piotr Kolodziejek

2011-12-01T23:59:59.000Z

265

A Comparision of Sensorless Control Strategies of Doubly Fed Induction Generator  

Science Conference Proceedings (OSTI)

Decoupled control has been widely used in the DIFG (doubly fed induction generator) which needs the rotor position as well as the rotor speed for the control system. A lot of research has been done in the sensorless control field for the DFIG because ... Keywords: Doubly Fed Induction Generator(DFIG), Decoupled Control, PI adjustor, Rotor position, Rotor speed, Sensorless control, MRAS

Xin Hao; Chong Wei Zhang; Xing Zhang

2009-10-01T23:59:59.000Z

266

Original articles: Flicker mitigation in a doubly fed induction generator wind turbine system  

Science Conference Proceedings (OSTI)

This paper describes a doubly fed induction generator (DFIG) control for wind energy generation. The DFIG model is established and the adopted control strategies for machine side and grid side converters are described. Flicker phenomenon is defined and ... Keywords: Doubly fed induction generator, Flicker, Machine side converter, Power quality, Wind power generation

Mohamed Machmoum; Ahmad Hatoum; Toufik Bouaouiche

2010-10-01T23:59:59.000Z

267

Modeling and control of a cascaded doubly-fed induction generator based on dynamical equivalent circuits  

Science Conference Proceedings (OSTI)

This paper deals with the control of an autonomous cascaded doubly-fed induction generator operating in a variable speed constant frequency mode. The proposed structure is a full stand-alone generating system dedicated to isolated grids in embedded systems ... Keywords: Aircraft applications, Cascaded doubly-fed induction generator, Isolated grid, Modeling, Control, Topology analysis, Variable speed constant frequency

N. Patin; E. Monmasson; J. -P. Louis

2010-10-01T23:59:59.000Z

268

The Simulation of Doubly Fed Induction Generators Accessing Gansu Jiajiu Power Grid Based on PSASP  

Science Conference Proceedings (OSTI)

Due to the asynchronous generator has many negative factors such as large power fluctuation, poor transient performance, low energy efficiency, etc. The doubly fed induction generator(DFIG) is becoming a popular concept and thus the modeling of DFIG ... Keywords: double fed induction generator, decoupling control, power flow, power system transient stability, PSASP/UD

Wei Wei; Wang Yu-Hong; Li Xing-yuan; Deng Jing

2010-10-01T23:59:59.000Z

269

High Gain Observer for Induction Motor in Presence of Magnetic Hysteresis , L. Dugard3  

E-Print Network (OSTI)

High Gain Observer for Induction Motor in Presence of Magnetic Hysteresis H. Ouadi1 , F. Giri2 , L in induction motors is considered in this paper. In most previous works, motor observers have been designed using standard models, neglecting the saturation and hysteretic effects in the machine magnetic circuit

Paris-Sud XI, Université de

270

Development of a cryogenic induction motor for use with a superconducting magnetic bearing  

E-Print Network (OSTI)

Development of a cryogenic induction motor for use with a superconducting magnetic bearing Tomotake of a superconducting magnetic bearing (SMB). Both the motor and the SMB are operated at liquid He temperatures. We give Keywords: Astrophysical polarimeter; Induction motor; Superconducting magnetic bearings 1. Introduction

Oxley, Paul

271

NDCX-II, an Induction Linac for HEDP and IFE Research  

SciTech Connect

The Heavy Ion Fusion Science Virtual National Laboratory in the USA is constructing a new Neutralized Drift Compression eXperiment (NDCX-II) at LBNL. This facility is being developed for high energy density physics and inertial fusion energy research. The 12 m long induction linac in NDCX-II will produce a Li{sup +} beam pulse, at energies of 1.2-3 MeV, to heat target material to the warm dense matter regime ({approx} 1 eV). By making use of special acceleration voltage waveforms, 2.5T solenoid focusing, and neutralized drift compression, 20 - 50 nC of beam charge from the ion source will be compressed longitudinally and radially to achieve a subnanosecond pulse length and mm-scale target spot size. The original Neutralized Drift Compression Experiment (NDCX-I) has successfully demonstrated simultaneous radial and longitudinal compression by imparting a velocity ramp to the ion beam, which then drifts in a neutralizing plasma to and through the final focussing solenoid and onto the target. At higher kinetic energy and current, NDCX-II will offer more than 100 times the peak energy fluence on target of NDCX-I. NDCX-II makes use of many parts from the decommissioned Advanced Test Accelerator (ATA) at LLNL. It includes 27 lattice periods between the injector and the neutralized drift compression section (Figure 1). There are 12 energized induction cells, 9 inactive cells which provide drift space, and 6 diagnostic cells which provide beam diagnostics and pumping. Custom pulsed power systems generate ramped waveforms for the first 7 induction cells, so as to quickly compress the beam from 600 ns at the injector down to 70 ns. After this compression, the high voltages of the ATA Blumleins are then used to rapidly add energy to the beam. The Blumleins were designed to match the ferrite core volt-seconds with pulses up to 250 kV and a fixed FWHM of 70 ns. The machine is limited to a pulse repetition rate of once every 20 seconds due to cooling requirements. The NDCX-II beam is highly space-charge dominated. The 1-D ASP code was used to synthesize high voltage waveform for acceleration, while the 3-D Warp particle-in-cell code was used for detailed design of the lattice. The Li{sup +} ion was chosen because its Bragg Peak energy (at {approx} 2 MeV) coincides with the NDCX-II beam energy. The 130 keV injector will have a 10.9 cm diameter ion source. Testing of small (0.64 cm diameter) lithium doped alumino-silicate ion sources has demonstrated the current density ({approx} 1 mA/cm{sup 2}) used in the design, with acceptable lifetime. A 7.6 cm diameter source has been successfully produced to verify that the coating method can be applied to such a large emitting area. The ion source will operate at {approx} 1275 C; thus a significant effort was made in the design to manage the 4 kW heating power and the associated cooling requirements. In modifying the ATA induction cells for NDCX-II, the low-field DC solenoids were replaced with 2.5 T pulsed solenoids. The beam pipe diameter was decreased in order to reduce the axial extent of the solenoid fringe fields and to make room for water cooling. In addition, an outer copper cylinder (water-cooled) was used to exclude the solenoid magnetic flux from the ferrite cores. Precise alignment is essential because the beam has a large energy spread due to the rapid pulse compression, such that misalignments lead to corkscrew deformation of the beam and reduced intensity at focus. A novel pulsed-wire measurement method is used to align the pulsed solenoid magnets. Alignment accuracy has been demonstrated to within 100 {micro}m of the induction cell axis. The neutralized drift compression region after the last induction cell is approximately 1.2 m long and includes ferroelectric plasma sources (FEPS) fabricated by PPPL similar to those successfully operating in NDCX-I. The 8-T final focus pulsed solenoid, filtered cathodic arc plasma sources (FCAPS), and target chamber from NDCX-I are to be relocated to NDCX-II. The NDCX-II project started in July 2009 and is expected to complete in fall of 2011.

Kwan, J.W.; Arbelaez, D.; Bieniosek, F.M.; Faltens, A.; Friedman, A.; Galvin, J.; Greenway, W.; Gilson, E. P.; Grote, D. P.; Jung, J.Y.; Lee, E.P.; Leitner, M.; Lidia, S.M.; Logan, B.G.; Lund, S. M.; Reginato, L.L.; Roy, P.K.; Seidl, P.A.; Sharp, W. M.; Takakuwa, J.; Waldron, W.L.

2011-04-20T23:59:59.000Z

272

Discrimination among mechanical fault types in induction motors using electrical measurements  

E-Print Network (OSTI)

Rotating machine failures are a major cause of downtime in a wide variety of industrial processes and are a burden on maintenance personnel and facilities. Some of these failures occur suddenly and are seemingly unpredictable. However, the overwhelming majority develop slowly over time and produce characteristic warning signs. A system capable of detecting and diagnosing these incipient faults before they become critical would significantly reduce downtime and serve to facilitate maintenance and repair of these machines. The ability to accurately distinguish between different types of incipient faults would be a critical aspect of such a system. In this research, a model-based method for diagnosing motor faults is examined and tested using two squirrel-cage AC induction motors with staged fault conditions. The proposed method involves the multi-resolution signal analysis of the current residuals. These residuals are generated by comparing the measured motor current with the current predicted by a recurrent neural network. The frequency content of the distortion of the residuals is used to identify the type of fault present. Although "steady-state" conditions are examined exclusively in this research, the nonstationarities of the current signals are sufficient to warrant the use of multi-resolution analysis. The fault diagnosis system is tested using data taken from an 800 hp motor and a 3 hp motor. The method is successful in identifying residual distortion in the frequency range expected for broken-bar faults. Because the magnitude of the distortion grows with increasing fault severity, the method is also useful for evaluating fault severity for broken-bar faults. However, the current distortions caused by rotor eccentricities and damaged bearings are too small to be identified in a statistically significant manner using this approach. Nevertheless, this research demonstrates the feasibility of a general method by which the characteristic frequencies produced by a particular type of fault can be identified in the output of a system.

McFatter, Justin Robert

2002-01-01T23:59:59.000Z

273

WIPP Employee Inducted Into Mine Rescue Hall of Fame - WIPP Teams  

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

Employee Inducted Into Mine Rescue Hall of Fame - WIPP Teams Employee Inducted Into Mine Rescue Hall of Fame - WIPP Teams Recognized at National Competition WIPP Employee Inducted Into Mine Rescue Hall of Fame - WIPP Teams Recognized at National Competition August 2, 2013 - 12:00pm Addthis Waste Isolation Pilot Plant Blue Mine Rescue Team Captain Gary Kessler (right) receives an award from Neal Merrifield, administrator for the Mine Safety and Health Administration Metal/Non-Metal mines, after Kessler was inducted into the National Mine Rescue Hall of Fame on Aug. 1, 2013. Waste Isolation Pilot Plant Blue Mine Rescue Team Captain Gary Kessler (right) receives an award from Neal Merrifield, administrator for the Mine Safety and Health Administration Metal/Non-Metal mines, after Kessler was inducted into the National Mine Rescue Hall of Fame on Aug. 1, 2013.

274

EA-1087: Proposed Induction Linac System Experiments in Building 51B at  

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

7: Proposed Induction Linac System Experiments in Building 7: Proposed Induction Linac System Experiments in Building 51B at Lawrence Berkeley National Laboratory, Berkeley, California EA-1087: Proposed Induction Linac System Experiments in Building 51B at Lawrence Berkeley National Laboratory, Berkeley, California SUMMARY This EA evaluates the environmental impacts of a proposal to modify existing Building 51B at the U.S. Department of Energy's Lawrence Berkeley National Laboratory to install and conduct experiments on a new Induction Linear Accelerator System. PUBLIC COMMENT OPPORTUNITIES None available at this time. DOCUMENTS AVAILABLE FOR DOWNLOAD September 8, 1995 EA-1087: Finding of No Significant Impact Proposed Induction Linac System Experiments in Building 51B at Lawrence Berkeley National Laboratory, Berkeley, California

275

Rotating electrical machines. Part 2: Methods for determining losses and efficiency of rotating electrical machinery from tests (excluding machines for traction vehicles)  

E-Print Network (OSTI)

Applies to d.c. machines and to a.c. synchronous and induction machines. The principles can be applied to other types of machines such as rotary converters, a.c. commutator motors and single-phase induction motors for which other methods of determining losses are used.

International Electrotechnical Commission. Geneva

1972-01-01T23:59:59.000Z

276

Fundamental and methodological investigations for the improvement of elemental analysis by inductively coupled plasma mass soectrometry  

Science Conference Proceedings (OSTI)

This dissertation describes a variety of studies meant to improve the analytical performance of inductively coupled plasma mass spectrometry (ICP-MS) and laser ablation (LA) ICP-MS. The emission behavior of individual droplets and LA generated particles in an ICP is studied using a high-speed, high frame rate digital camera. Phenomena are observed during the ablation of silicate glass that would cause elemental fractionation during analysis by ICP-MS. Preliminary work for ICP torch developments specifically tailored for the improvement of LA sample introduction are presented. An abnormal scarcity of metal-argon polyatomic ions (MAr{sup +}) is observed during ICP-MS analysis. Evidence shows that MAr{sup +} ions are dissociated by collisions with background gas in a shockwave near the tip of the skimmer cone. Method development towards the improvement of LA-ICP-MS for environmental monitoring is described. A method is developed to trap small particles in a collodion matrix and analyze each particle individually by LA-ICP-MS.

Ebert, Christopher Hysjulien [Ames Laboratory

2012-07-27T23:59:59.000Z

277

A quantum description of radiation damping and the free induction signal in magnetic resonance  

Science Conference Proceedings (OSTI)

We apply the methods of cavity quantum electrodynamics (CQED), to obtain a microscopic and fully quantum-mechanical picture of radiation damping in magnetic resonance, and the nascent formation of the free induction signal. Numerical solution of the Tavis-Cummings model - i.e., multiple spins 1/2 coupled to a lossless single-mode cavity - shows in fine detail the transfer of Zeeman energy, via spin coherence, to excite the cavity - represented here by a quantized LC resonator. The case of a single spin is also solved analytically. Although the motion of the Bloch vector is non-classical, we nonetheless show that the quantum mechanical Rabi nutation frequency (as enhanced by cavity coupling and stimulated emission) gives realistic estimates of macroscopic signal strength and the radiation damping constant in nuclear magnetic resonance. We also show how to introduce dissipation: cavity losses by means of a master equation, and relaxation by the phenomenological method of Bloch. The failure to obtain the full Bloch equations (unless semi-classical conditions are imposed on the cavity) is discussed in light of similar issues arising in CQED (and in earlier work in magnetic resonance as well), as are certain problems relative to quantization of the electromagnetic near-field.

Tropp, James [General Electric Healthcare Technologies, 47697 Westinghouse Drive, Fremont, California 94539 (United States)

2013-07-07T23:59:59.000Z

278

The Cost of Superconducting Magnets as a Function of Stored Energy and Design Magnetic Induction Times the Field Volume  

E-Print Network (OSTI)

costs given magnet stored-energy or average bore induction timecost will go up with stored energy and with field volume timesCost of Superconducting Magnets as a Function of Stored Energy and Design Magnetic Induction times

Green, M.A.

2008-01-01T23:59:59.000Z

279

A New Parameter Identification Method for Hydraulic Fractured Gas Wells  

Science Conference Proceedings (OSTI)

The relaxation search algorithm to identify the parameters of hydraulic fractured gas wells is developed in this paper based on the inductive matrix. According to the optimization theory and parallel computation method, the parameters to be identified ... Keywords: Gas Wells, hydraulic fracturing, formation parameters, parameter identification, historic fitting

Li Tiejun; Guo Dali; Min Chao

2010-12-01T23:59:59.000Z

280

Systems and methods for deactivating a matrix converter  

DOE Patents (OSTI)

Systems and methods are provided for deactivating a matrix conversion module. An electrical system comprises an alternating current (AC) interface, a matrix conversion module coupled to the AC interface, an inductive element coupled between the AC interface and the matrix conversion module, and a control module. The control module is coupled to the matrix conversion module, and in response to a shutdown condition, the control module is configured to operate the matrix conversion module to deactivate the first conversion module when a magnitude of a current through the inductive element is less than a threshold value.

Ransom, Ray M.

2013-04-02T23:59:59.000Z

Note: This page contains sample records for the topic "vlf induction method" 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

Application of genetic algorithm to improve voltage regulation of self-excited induction generator in a wind energy conversion system  

Science Conference Proceedings (OSTI)

Self-excited induction generators have been found to be most suitable for wind energy conversion in remote locations. In this paper, an attempt has been made to improve the voltage regulation of self-excited induction generator (SEIG) using series compensation. ... Keywords: genetic algorithms, intelligent systems, modelling, renewable energy, self-excited induction generators, simulation, voltage regulation, wind energy conversion systems, wind power

Dheeraj Joshi; K. S. Sandhu; M. K. Soni

2007-02-01T23:59:59.000Z

282

UBC Social Ecological Economic Development Studies (SEEDS) Student Report An Introduction into Induction and Natural Gas Stoves  

E-Print Network (OSTI)

into Induction and Natural Gas Stoves: A Triple Bottom Line Analysis for the new Student Union Building Jordan Ho of a project/report". #12;APSC 262 An Introduction Into Induction and Natural Gas Stoves A triple-bottom line, 2011 #12;Page 2 of 21 ABSTRACT This report compares the attributes of induction and natural gas stoves

283

Radiation of VLF/ELF waves from a magnetospheric tether  

E-Print Network (OSTI)

The high energy particles of the Van Allen belts coming from cosmic rays, solar storms, high altitude nuclear explosions (HANEs) and other processes represent a significant danger to humans and spacecraft operating in those ...

De Soria-Santacruz Pich, Maria

2011-01-01T23:59:59.000Z

284

Reversing-counterpulse repetitive-pulse inductive storage circuit  

DOE Patents (OSTI)

A high-power reversing-counterpulse repetitive-pulse inductive storage and transfer circuit includes an opening switch, a main energy storage coil, a counterpulse capacitor and a small inductor. After counterpulsing the opening switch off, the counterpulse capacitor is recharged by the main energy storage coil before the load pulse is initiated. This gives the counterpulse capacitor sufficient energy for the next counterpulse operation, although the polarity of the capacitor's voltage must be reversed before that can occur. By using a current-zero switch as the counterpulse start switch, the capacitor is disconnected from the circuit (with a full charge) when the load pulse is initiated, preventing the capacitor from depleting its energy store by discharging through the load. After the load pulse is terminated by reclosing the main opening switch, the polarity of the counterpulse capacitor voltage is reversed by discharging the capacitor through a small inductor and interrupting the discharge current oscillation at zero current and peak reversed voltage. The circuit enables high-power, high-repetition-rate operation with reusable switches and features total control (pulse-to-pulse) over output pulse initiation, duration, repetition rate, and, to some extent, risetime. 10 figs.

Honig, E.M.

1987-02-10T23:59:59.000Z

285

Reversing-counterpulse repetitive-pulse inductive storage circuit  

DOE Patents (OSTI)

A high-power reversing-counterpulse repetitive-pulse inductive storage and transfer circuit includes an opening switch, a main energy storage coil, a counterpulse capacitor and a small inductor. After counterpulsing the opening switch off, the counterpulse capacitor is recharged by the main energy storage coil before the load pulse is initiated. This gives the counterpulse capacitor sufficient energy for the next counterpulse operation, although the polarity of the capacitor's voltage must be reversed before that can occur. By using a current-zero switch as the counterpulse start switch, the capacitor is disconnected from the circuit (with a full charge) when the load pulse is initiated, preventing the capacitor from depleting its energy store by discharging through the load. After the load pulse is terminated by reclosing the main opening switch, the polarity of the counterpulse capacitor voltage is reversed by discharging the capacitor through a small inductor and interrupting the discharge current oscillation at zero current and peak reversed voltage. The circuit enables high-power, high-repetition-rate operation with reusable switches and features total control (pulse-to-pulse) over output pulse initiation, duration, repetition rate, and, to some extent, risetime.

Honig, Emanuel M. (Los Alamos, NM)

1987-01-01T23:59:59.000Z

286

Numerical Analysis Of Three Component Induction Logging In Geothermal Reservoirs  

DOE Green Energy (OSTI)

This project is supporting the development of the ''Geo-Bilt'', geothermal electromagnetic-induction logging tool that is being built by ElectroManetic Instruments, Inc. The tool consists of three mutually orthogonal magnetic field antennas, and three-component magnetic field receivers located at different distances from the source. In its current configuration, the source that has a moment aligned along the borehole axis consists of a 1m long solenoid, while the two trans-axial sources consist of 1m by 8cm loops of wire. The receivers are located 2m and 5m away from the center of the sources, and five frequencies from 2 kHz to 40 kHz are being employed. This study is numerically investigating (1) the effect of the borehole on the measurements, and (2) the sensitivity of the tool to fracture zone-geometries that might be encountered in a geothermal field. The benefits of the results are that they will lead to a better understanding of the data that the tool produces during its testing phase and an idea of what the limitations of the tool are.

Dr. David L. Alumbaugh

2002-01-09T23:59:59.000Z

287

Microscopy Methods  

Science Conference Proceedings (OSTI)

... NIST has worked extensively with microscope manufacturers such as FEI ... Electron microscopy methods have been used to characterize potential ...

2012-10-05T23:59:59.000Z

288

Diagnosis and Isolation of Air Gap Eccentricities in Closed-loop Controlled Doubly-Fed Induction Generators  

E-Print Network (OSTI)

With the widespread use of doubly-fed induction generators (DFIG) in wind energy conversion systems, condition monitoring is being given importance. Non-intrusive techniques like motor current signature analysis (MCSA), which involves looking for specific frequency components in the current spectrum, are preferred over analysis of magnetic field, temperature, vibrations or acoustic noise which require additional sensors. The major difficulty in MCSA is isolation of the fault, as multiple faults produce similar signatures. Moreover, closed-loop control makes diagnostics more complicated due to inherent compensation by the controller. This thesis presents a method to diagnose static and dynamic air gap eccentricities in doubly-fed induction generators operated for closed-loop stator power control by using a modified control technique to enable detection and isolation of this fault from electrical unbalances in the stator and rotor and load torque oscillations that produce similar effects. The effectiveness of the proposed control is verified using simulations and preliminary experiments performed on a healthy machine.

Meenakshi Sundaram, Vivek

2011-05-01T23:59:59.000Z

289

Correlation methods  

DOE Green Energy (OSTI)

Correlation methods have been developed to provide a quick and relatively simple technique for estimating the performance of passive solar systems. The correlations are done with respect to data generated from simulation models. The techniques and accuracies are described. Both the Solar Load Ratio and Un-Utilizability methods are described. The advantages and limitations of correlation methods as design tools are discussed.

Balcomb, J.D.

1981-01-01T23:59:59.000Z

290

Studies of selenium and xenon in inductively coupled plasma mass spectrometry  

SciTech Connect

Since its development, inductively coupled plasma mass spectrometry (ICP-MS) has been a widely used analytical technique. ICP-MS offers low detection limits, easy determination of isotope ratios, and simple mass spectra from analyte elements. ICP-MS has been successfully employed for many applications including geological, environmental, biological, metallurgical, food, medical, and industrial. One specific application important to many areas of study involves elemental speciation by using ICP-MS as an element specific detector interfaced to liquid chromatography. Elemental speciation information is important and cannot be obtained by atomic spectrometric methods alone which measure only the total concentration of the element present. Part 1 of this study describes the speciation of selenium in human serum by size exclusion chromatography (SEC) and detection by ICP-MS. Although ICP-MS has been widely sued, room for improvement still exists. Difficulties in ICP-MS include noise in the background, matrix effects, clogging of the sampling orifice with deposited solids, and spectral interference caused by polyatomic ions. Previous work has shown that the addition of xenon into the central channel of the ICP decreases polyatomic ion levels. In Part 2 of this work, a fundamental study involving the measurement of the excitation temperature is carried out to further understand xenon`s role in the reduction of polyatomic ions. 155 refs.

Bricker, T.

1994-07-27T23:59:59.000Z

291

Isolation and characterization of five ozone-inductible cDNA clones from Atriplax canescens (saltbush)  

E-Print Network (OSTI)

Prolonged exposure of plants to ozone inhibits growth and development and produces visible signs of damage. Within a few hours of exposure, certain biochemical alterations have been observed with the induction of several stress-related proteins. accumulation of several polya RNAS. CDNA clones derived from five different polya RNAs which accumulate in ozone-stressed shrub leaves were isolated by differential screening methods. Alteration in gene expression which occurs with ozone, sulfur dioxide and water deficit were examined, and those cDNAs were sequenced. Clone 012-1, hybridized with three RNA species, is initially induced in response to both ozone and water deficit stress, but is repressed to prolonged ozone and sulfur dioxide exposure. Clone 012-1 has strong homology with small subunit RRNA. Northern blots suggest that transcripts hybridized to 012-1 are a naked species (about 1.45 kb) and are subfragments (1.0 and 0.45 kb) of 1.4 kb species. 0112A-3 showed an increase in response to two pollutants, but not to water deficit. 0112A-3 encodes a polypeptide which has homology with wound-inducible protein inhibitors. MRNA species corresponding to 018-3 are transiently induced in response to sulfur dioxide and water deficit stress, and are late-induced by ozone stress. The 018-3 protein is Ozone fumigation to Atriplex canescens (saltbush) caused the homologous to thiol proteases. Clone OID2-2 and OIS14-3 show similar patterns in gene expression Transcript levels of the two genes rise rapidly and remain at a high level by seven days after ozone fumigation, and rise steadily in response to water deficit and sulfur dioxide stress. The deduced amino acids of both clones are glycine-rich proteins, and they have repeated motifs, (G-G-G-Y-G-H)n, and putative cell wall-targeting signal peptides. Northern analyses indicate that plant cells respond to ozone stress by increasing transcription of several genes. Furthermore, the expression of ozone-inducible genes varies with respect to the time course of induction and different stresses such as water-deficit and sulfur dioxide stress. The encoded proteins suggest that: first, ozone stress may generate wounding damage to increase the expression of the proteinase inhibitor (0112A-3) and the protease (018-3); second, ozone stress may change the cell wall components by increasing the amount of glycine-rich proteins (OID2-2 and OIS14-3); and third, ozone stress may change the cell wall structure with tyrosine-mediated cross-linking, which may use oxyradical-scavenging effects to relieve cellular stress.

No, Eun-Gyu

1994-01-01T23:59:59.000Z

292

Determination of total chlorine and bromine in solid wastes by sintering and inductively coupled plasma-sector field mass spectrometry  

Science Conference Proceedings (OSTI)

A sample preparation method based on sintering, followed by analysis by inductively coupled plasma-sector field mass spectrometry (ICP-SFMS) for the simultaneous determination of chloride and bromide in diverse and mixed solid wastes, has been evaluated. Samples and reference materials of known composition were mixed with a sintering agent containing Na{sub 2}CO{sub 3} and ZnO and placed in an oven at 560 deg. C for 1 h. After cooling, the residues were leached with water prior to a cation-exchange assisted clean-up. Alternatively, a simple microwave-assisted digestion using only nitric acid was applied for comparison. Thereafter the samples were prepared for quantitative analysis by ICP-SFMS. The sintering method was evaluated by analysis of certified reference materials (CRMs) and by comparison with US EPA Method 5050 and ion chromatography with good agreement. Median RSDs for the sintering method were determined to 10% for both chlorine and bromine, and median recovery to 96% and 97%, respectively. Limits of detection (LODs) were 200 mg/kg for chlorine and 20 mg/kg for bromine. It was concluded that the sintering method is suitable for chlorine and bromine determination in several matrices like sewage sludge, plastics, and edible waste, as well as for waste mixtures. The sintering method was also applied for determination of other elements present in anionic forms, such as sulfur, arsenic, selenium and iodine.

Osterlund, Helene [Division of Applied Geology, Lulea University of Technology, S-971 87 Lulea (Sweden); ALS Scandinavia AB, ALS Laboratory Group, Aurorum 10, S-977 75 Lulea (Sweden)], E-mail: Helene.Osterlund@alsglobal.com; Rodushkin, Ilia [Division of Applied Geology, Lulea University of Technology, S-971 87 Lulea (Sweden); ALS Scandinavia AB, ALS Laboratory Group, Aurorum 10, S-977 75 Lulea (Sweden); Ylinenjaervi, Karin; Baxter, Douglas C. [ALS Scandinavia AB, ALS Laboratory Group, Aurorum 10, S-977 75 Lulea (Sweden)

2009-04-15T23:59:59.000Z

293

Corpus-based semantic lexicon induction with Web-based corroboration  

Science Conference Proceedings (OSTI)

Various techniques have been developed to automatically induce semantic dictionaries from text corpora and from the Web. Our research combines corpus-based semantic lexicon induction with statistics acquired from the Web to improve the accuracy of automatically ...

Sean P. Igo; Ellen Riloff

2009-06-01T23:59:59.000Z

294

Analysis of electromechanical interactions in a flywheel system with a doubly fed induction machine  

E-Print Network (OSTI)

This paper analyzes the electromechanical inter-action in a flywheel system with a doubly fed induction machine, used for wind farm power smoothing or grid frequency response control. The grid-connected electrical machine ...

Ran, Li

295

Performance of Rotors in a Brushless Doubly-Fed Induction Machine (BDFM)  

E-Print Network (OSTI)

and the output frequency of the inverter. In common with the currently used double-fed induction generator (DFIG the construction of a machine with a rating similar to that of existing DFIGs, see Figure 1. The authors' BDFM uses

Cambridge, University of

296

Performance Optimization Criteria for Pulsed Inductive Plasma Acceleration Kurt A. Polzin  

E-Print Network (OSTI)

, which will both be less than one in a real pulsed electromagnetic accelerator. · The inductance ratio, L with decreasing L showing the importance of increasing the ratio LC/L0 in a pulsed electromagnetic accelerator

Choueiri, Edgar

297

Development of laboratory doubly fed induction generator for wind energy research.  

E-Print Network (OSTI)

??This thesis studies the basic concept of doubly-fed induction generators (DFIG) and develops a laboratory model to simulate DFIG wind turbine generators (WTG). “Doubly-fed” refers… (more)

Hu, Zhouxing

2010-01-01T23:59:59.000Z

298

Harmonic control of multiple-stator induction machines for voltage regulation  

E-Print Network (OSTI)

Small, one to a few horsepower, three-phase induction machines with three sets of electrically-isolated, magnetically-coupled stator winding circuits are described. A voltage inverter is developed and used to drive one set ...

Holloway, Jack Wade, 1980-

2004-01-01T23:59:59.000Z

299

WIPP Employee Inducted Into Mine Rescue Hall of Fame - WIPP Teams...  

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

Inducted Into Mine Rescue Hall of Fame - WIPP Teams Recognized at National Competition August 2, 2013 - 12:00pm Addthis Waste Isolation Pilot Plant Blue Mine Rescue Team Captain...

300

A Study on Insulation Problems in Drive Fed Medium Voltage Induction Motors.  

E-Print Network (OSTI)

??The PWM (pulse-width-modulated) type voltage source converters (VSC) allow a precise speed control of induction motors with maximum achievable energy efficiency. However, the rapid growth… (more)

Haq, Saeed UL

2007-01-01T23:59:59.000Z

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


301

Multilevel DC Link Inverter for Brushless Permanent Magnet Motors with Very Low Inductance  

SciTech Connect

Due to their long effective air gaps, permanent magnet motors tend to have low inductance. The use of ironless stator structure in present high power PM motors (several tens of kWs) reduces the inductance even further (< 100 {micro}H). This low inductance imposes stringent current regulation demands for the inverter to obtain acceptable current ripple. An analysis of the current ripple for these low inductance brushless PM motors shows that a standard inverter with the most commonly used IGBT switching devices cannot meet the current regulation demands and will produce unacceptable current ripples due to the IGBT's limited switching frequency. This paper introduces a new multilevel dc link inverter, which can dramatically reduce the current ripple for brushless PM motor drives. The operating principle and design guidelines are included.

Su, G.J.

2001-10-29T23:59:59.000Z

302

Comparison of Control Strategy for Double-fed Induction Generator (DFIG)  

Science Conference Proceedings (OSTI)

Vector Control(VC) and Direct Power Control (DPC) of Doubly Fed Induction Generator(DFIG) is studied in this paper. Grid connection and steady state running for DFIG are discussed based on VC and DPC. Two kinds of control strategies of DFIG both have ... Keywords: double-fed induction generator (DFIG), idle load grid-connection, direct power control, vector control, grid voltage orientation

Liu Qizhong; Yu Lan; Wu Guoxiang

2011-01-01T23:59:59.000Z

303

Indirect vector control of a squirrel cage induction generator wind turbine  

Science Conference Proceedings (OSTI)

The paper deals with a squirrel cage induction generator connected to the grid through a back-to-back converter driven by vector control. The stator-side converter controls the generator torque by means of an indirect vector control scheme. In order ... Keywords: Back-to-back converter, Low voltage ride through, Squirrel cage induction generator (SCIG), Torque regulation, Vector control, Wind power generation

José Luis DomíNguez-GarcíA; Oriol Gomis-Bellmunt; LluíS Trilla-Romero; Adrií Junyent-Ferré

2012-07-01T23:59:59.000Z

304

Cold Crucible Induction Melter Technology: Results of Laboratory Directed Research and Development  

SciTech Connect

This report provides a review of cold crucible induction melter (CCIM) technology and presents summaries of alternatives and design issues associated with major system components. The objective in this report is to provide background systems level information relating to development and application of cold crucible induction-heated melter technology for radiological waste processing. Included is a detailed description of the bench-top melter system at the V. G. Khlopin Radium Institute currently being used for characterization testing

Gombert, Dirk; Richardson, John Grant

2001-09-01T23:59:59.000Z

305

Connection method  

DOE Patents (OSTI)

A method is disclosed of making a region exhibiting a range of compositions, comprising plasma spraying various compositions on top of one another onto a base. 2 figs.

Weyand, J.D.

1986-11-18T23:59:59.000Z

306

Connection method  

SciTech Connect

A method of making a region exhibiting a range of compositions, comprising plasma spraying various compositions on top of one another onto a base.

Weyand, John D. (Greensburg, PA)

1986-01-01T23:59:59.000Z

307

Test Methods  

Science Conference Proceedings (OSTI)

... of the robot, operator control unit (OCU), payload, and batteries • Tools needed ... this test method is to quantitatively evaluate the battery capacity per ...

2010-10-05T23:59:59.000Z

308

RAPID DETERMINATION OF 237 NP AND PU ISOTOPES IN WATER BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY AND ALPHA SPECTROMETRY  

Science Conference Proceedings (OSTI)

A new method that allows rapid preconcentration and separation of plutonium and neptunium in water samples was developed for the measurement of {sup 237}Np and Pu isotopes by inductively-coupled plasma mass spectrometry (ICP-MS) and alpha spectrometry; a hybrid approach. {sup 238}U can interfere with {sup 239}Pu measurement by ICP-MS as {sup 238}UH{sup +} mass overlap and {sup 237}Np via peak tailing. The method provide enhanced removal of uranium by separating Pu and Np initially on TEVA Resin, then moving Pu to DGA resin for additional removal of uranium. The decontamination factor for uranium from Pu is almost 100,000 and the decontamination factor for U from Np is greater than 10,000. This method uses stacked extraction chromatography cartridges and vacuum box technology to facilitate rapid separations. Preconcentration is performed using a streamlined calcium phosphate precipitation method. Purified solutions are split between ICP-MS and alpha spectrometry so that long and short-lived Pu isotopes can be measured successfully. The method allows for simultaneous extraction of 20 samples (including QC samples) in 4 to 6 hours, and can also be used for emergency response. {sup 239}Pu, {sup 242}Pu and {sup 237}Np were measured by ICP-MS, while {sup 236}Pu, {sup 238}Pu, and {sup 239}Pu were measured by alpha spectrometry.

Maxwell, S.; Jones, V.; Culligan, B.; Nichols, S.; Noyes, G.

2010-06-23T23:59:59.000Z

309

{sup 99}Tc bioassay by inductively coupled plasma mass spectrometry (ICP-MS)  

Science Conference Proceedings (OSTI)

A means of analyzing {sup 99}Tc in urine by inductively coupled plasma mass spectrometry (ICP-MS) has been developed. Historically, {sup 99}Tc analysis was based on the radiometric detection of the 293 keV E{sub Max} beta decay product by liquid scintillation or gas flow proportional counting. In a urine matrix, the analysis of{sup 99}Tc is plagued with many difficulties using conventional radiometric methods. Difficulties originate during chemical separation due to the volatile nature of Tc{sub 2}O{sub 7} or during radiation detection due to color or chemical quenching. A separation scheme for {sup 99}Tc detection by ICP-MS is given and is proven to be a sensitive and robust analytical alternative. A comparison of methods using radiometric and mass quantitation of {sup 99}Tc has been conducted in water, artificial urine, and real urine matrices at activity levels between 700 and 2,200 dpm/L. Liquid scintillation results based on an external standard quench correction and a quench curve correction method are compared to results obtained by ICP-MS. Each method produced accurate results, however the precision of the ICP-MS results is superior to that of liquid scintillation results. Limits of detection (LOD) for ICP-MS and liquid scintillation detection are 14.67 and 203.4 dpm/L, respectively, in a real urine matrix. In order to determine the basis for the increased precision of the ICP-MS results, the detection sensitivity for each method is derived and measured. The detection sensitivity for the {sup 99}Tc isotope by ICP-MS is 2.175 x 10{sup {minus}7} {+-} 8.990 x 10{sup {minus}9} and by liquid scintillation is 7.434 x 10{sup {minus}14} {+-} 7.461 x 10{sup {minus}15}. A difference by seven orders of magnitude between the two detection systems allows ICP-MS samples to be analyzed for a period of 15 s compared to 3,600 s by liquid scintillation counting with a lower LOD.

Lewis, L.A.

1998-05-01T23:59:59.000Z

310

Improved efficiency and precise temperature control of low-frequency induction-heating pure iron vapor source on ECR ion source  

SciTech Connect

Multiply charged ions to be used prospectively are produced from solid pure material in an electron cyclotron resonance ion source (ECRIS). Recently a pure iron source is also required for the production of caged iron ions in the fullerene in order to control cells in vivo in bio-nano science and technology. We adopt directly heating iron rod by induction heating (IH) because it has non-contact with insulated materials which are impurity gas sources. We choose molybdenum wire for the IH coils because it doesn't need water cooling. To improve power efficiency and temperature control, we propose to the new circuit without previously using the serial and parallel dummy coils (SPD) for matching and safety. We made the circuit consisted of inductively coupled coils which are thin-flat and helix shape, and which insulates the IH power source from the evaporator. This coupling coils circuit, i.e. insulated induction heating coil transformer (IHCT), can be move mechanically. The secondary current can be adjusted precisely and continuously. Heating efficiency by using the IHCT is much higher than those of previous experiments by using the SPD, because leakage flux is decreased and matching is improved simultaneously. We are able to adjust the temperature in heating the vapor source around melting point. And then the vapor pressure can be controlled precisely by using the IHCT. We can control {+-}10K around 1500 Degree-Sign C by this method, and also recognize to controlling iron vapor flux experimentally in the extreme low pressures. Now we come into next stage of developing induction heating vapor source for materials with furthermore high temperature melting points above 2000K with the IHCT, and then apply it in our ECRIS.

Kato, Y.; Takenaka, T.; Yano, K.; Kiriyama, R.; Kurisu, Y.; Nozaki, D.; Muramatsu, M.; Kitagawa, A.; Uchida, T.; Yoshida, Y.; Sato, F.; Iida, T. [Osaka Univ., 2-1 Yamadaoka, Suita, Osaka, 565-0871 (Japan); National Institute of Radiological Science (NIRS), 4-9-1 Anagawa, Inage, Chiba, 263-8555 (Japan); Bio-Nano Electronics Research Centre, Toyo Univ., 2100 Kuzirai, Kawagoe, Saitama, 350-8585 (Japan); Osaka Univ., 2-1 Yamadaoka, Suita, Osaka, 565-0871 (Japan)

2012-11-06T23:59:59.000Z

311

Production of NANO powder of aluminum nitride by pulsed power method  

Science Conference Proceedings (OSTI)

After revision of applications, physical and chemical properties and various methods for production of nano powder of AlN, Pulsed Electrical Exploded Wire Discharge (EEW) method for production of various kinds of these nano powders has been studied in ... Keywords: AlN, EEW, low inductance pulse capacitor, nano powder, pulsed power, spark gap

M. M. Daemi Attaran; A. Erfanian; P. Ghassemi Kian

2008-04-01T23:59:59.000Z

312

Methods Development  

Science Conference Proceedings (OSTI)

ISO committee and more information on standardization effects pertaining to AOCS. Methods Development Analytical Chemistry acid analysis Analytical Chemistry aocs applicants april articles atomic)FluorometryDifferential scanning calorimetry chemist chemi

313

DETERMINATION OF 237NP AND PU ISOTOPES IN LARGE SOIL SAMPLES BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY  

Science Conference Proceedings (OSTI)

A new method for the determination of {sup 237}Np and Pu isotopes in large soil samples has been developed that provides enhanced uranium removal to facilitate assay by inductively coupled plasma mass spectrometry (ICP-MS). This method allows rapid preconcentration and separation of plutonium and neptunium in large soil samples for the measurement of {sup 237}Np and Pu isotopes by ICP-MS. {sup 238}U can interfere with {sup 239}Pu measurement by ICP-MS as {sup 238}UH{sup +} mass overlap and {sup 237}Np via {sup 238}U peak tailing. The method provides enhanced removal of uranium by separating Pu and Np initially on TEVA Resin, then transferring Pu to DGA resin for additional purification. The decontamination factor for removal of uranium from plutonium for this method is greater than 1 x 10{sup 6}. Alpha spectrometry can also be applied so that the shorter-lived {sup 238}Pu isotope can be measured successfully. {sup 239}Pu, {sup 242}Pu and {sup 237}Np were measured by ICP-MS, while {sup 236}Pu and {sup 238}Pu were measured by alpha spectrometry.

Maxwell, S.

2010-07-26T23:59:59.000Z

314

Induction, helicity, and alpha effect in a toroidal screw flow of liquid gallium  

SciTech Connect

We investigate experimentally induction mechanisms in a screw flow of gallium in a toroidal channel. The flow is nonstationary and operated in a spin-down regime: the channel (and fluid) are initially set into solid body rotation; as the channel is stopped the fluid is set into strong helical motion by diverters located inside the channel. In this study, we put a particular emphasis on the induction generated by these helical motions, which are expected to develop over the entire range of turbulent scales. We apply an external magnetic field either perpendicular to the channel axis parallel to it. At large scales the nonlinear induction mechanisms are associated with the Parker stretch and twist effect and with the expulsion due to overall rotation. Induction mechanisms can also originate in the small scale helicity as in the alpha induction effect of mean-field magnetohydrodynamics. Our measurements yield an upper bound for the alpha coefficient, significantly lower than estimates based on dimensional analysis. We discuss the consequences of our observations for the engineering of homogeneous dynamos in the laboratory.

Stepanov, R.; Denisov, S.; Noskov, V. [Institute of Continuous Media MechanicsKorolyov 1, 614061 Perm (Russian Federation); Volk, R.; Frick, P.; Pinton, J.-F. [Laboratoire de Physique de l'Ecole Normale Superieur de Lyon, CNRS UMR5672, 46 allee d'Italie, 69007 Lyon (France)

2006-04-15T23:59:59.000Z

315

LASER ABLATION-INDUCTIVELY COUPLED PLASMA-ATOMIC EMISSION SPECTROSCOPY STUDY AT THE 222-S LABORATORY USING HOT-CELL GLOVE BOX PROTOTYPE SYSTEM  

SciTech Connect

This report describes the installation, testing, and acceptance of the Waste Treatment and Immobilization Plant (WTP) procured laser ablation-inductively coupled plasma-atomic emission spectroscopy (LA-ICP-AES) system for remotely analyzing high-level waste (HLW) samples in a hot cell environment. The work was completed by the Analytical Process Development (APD) group in accordance with Task Order 2005-003; ATS MP 1027, Management Plan for Waste Treatment Plant Project Work Performed by Analytical Technical Services. The APD group at the 222-S Laboratory demonstrated acceptable turnaround time (TAT) and provide sufficient data to assess sensitivity, accuracy, and precision of the LA-ICP-AES method.

SEIDEL CM; JAIN J; OWENS JW

2009-02-23T23:59:59.000Z

316

LASER ABLATION-INDUCTIVELY COUPLED PLASMA-ATOMIC EMISSION SPECTROSCOPY STUDY AT THE 222-S LABORATORY USING HOT-CELL GLOVE BOX PROTOTYPE SYSTEM  

SciTech Connect

This report describes the installation, testing and acceptance of the Waste Treatment and Immobilization Plant procured laser ablation-inductively coupled plasma-atomic emission spectroscopy (LA-ICP-AES) system for remotely analyzing high-level waste samples in a hot cell environment. The 2005-003; ATS MP 1027, Management Plan for Waste Treatment Plant Project Work Performed by Analytical Technical Services. The APD group at the 222-S laboratory demonstrated acceptable turnaround time (TAT) and provide sufficient data to assess sensitivity, accuracy, and precision of the LA-ICP-AES method.

LOCKREM LL; OWENS JW; SEIDEL CM

2009-03-26T23:59:59.000Z

317

An Induction Linac Approach to Phase Rotation of a Muon Bunch in the Production Region of a mu+ - mu- Collider  

E-Print Network (OSTI)

geometry and voltage waveshape requirements. We now turn tocell and voltage insulation requirements. An induction cellgap region. The requirements of voltage insulation and

Turner, W.C.

2011-01-01T23:59:59.000Z

318

Control strategies of doubly fed induction generator-based wind turbine system with new rotor current protection topology  

Science Conference Proceedings (OSTI)

A protection scheme of a doubly fed induction generator (DFIG) based wind turbine system during faults is crowbar activation. With this protection

Jackson John Justo; Kyoung-Soo Ro

2012-01-01T23:59:59.000Z

319

Modeling, analysis, control and design application guidelines of doubly fed induction generator (DFIG) for wind power applications.  

E-Print Network (OSTI)

??Double Fed Induction Generators (DFIG) has been widely used for the past two decades in large wind farms. However, there are many open-ended problems yet… (more)

Masaud, Tarek

2013-01-01T23:59:59.000Z

320

Performance Improvement of Doubly Fed Induction Generator-based Wind Energy Conversion System during Various Internal Converter Faults.  

E-Print Network (OSTI)

??The doubly fed induction generator (DFIG)-based wind energy conversion system (WECS) currently dominates the wind energy market due to its advantages over other WECSs. In… (more)

Abdou, Ahmed

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "vlf induction method" 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

Combination induction plasma tube and current concentrator for introducing a sample into a plasma  

SciTech Connect

An induction plasma tube in combination with a current concentrator. The rent concentrator has a substantially cylindrical body having an open end and a partially closed end which defines an aperture. A first slot extends the longitudinal length of the cylindrical body and a second slot extends radially outward from the aperture. Together the first and second slots form a single L-shaped slot. The current concentrator is disposed within a volume bounded by an induction coil substantially along the axis thereof, and when power is applied to the induction coil a concentrated current is induced within the current concentrator aperture. The concentrator is moveable relative to the coil along the longitudinal axis of the coil to control the amount of current which is concentrated at the aperture.

Hull, Donald E. (Los Alamos, NM); Bieniewski, Thomas M. (Los Alamos, NM)

1988-01-01T23:59:59.000Z

322

Collisionless electron heating by radio frequency bias in low gas pressure inductive discharge  

SciTech Connect

We show experimental observations of collisionless electron heating by the combinations of the capacitive radio frequency (RF) bias power and the inductive power in low argon gas pressure RF biased inductively coupled plasma (ICP). With small RF bias powers in the ICP, the electron energy distribution (EED) evolved from bi-Maxwellian distribution to Maxwellian distribution by enhanced plasma bulk heating and the collisionless sheath heating was weak. In the capacitive RF bias dominant regime, however, high energy electrons by the RF bias were heated on the EEDs in the presence of the ICP. The collisionless heating mechanism of the high energy electrons transited from collisionless inductive heating to capacitive coupled collisionless heating by the electron bounce resonance in the RF biased ICP.

Lee, Hyo-Chang; Chung, Chin-Wook [Department of Electrical Engineering, Hanyang University, Seoul 133-791 (Korea, Republic of)

2012-12-10T23:59:59.000Z

323

Magnetic Method to Characterize the Current Densities in Breaker Arc  

Science Conference Proceedings (OSTI)

The purpose of this research was to use magnetic induction measurements from a low voltage breaker arc, to reconstruct the arc's current density. The measurements were made using Hall effect sensors, which were placed close to, but outside the breaking device. The arc was modelled as a rectangular current sheet, composed of a mix of threadlike current segments and with a current density varying across the propagation direction. We found the magnetic induction of the arc is a convolution product of the current density, and a function depending on the breaker geometry and arc model. Using deconvolution methods, the current density in the electric arc was determined.The method is used to study the arc behavior into the breaker device. Notably, position, arc size, and electric conductivity could all be determined, and then used to characterize the arc mode, diffuse or concentrated, and study the condition of its mode changing.

Machkour, Nadia [National Institute of Standards and Technology (United States)

2005-04-15T23:59:59.000Z

324

Tracking Vector Magnetograms with the Magnetic Induction Equation  

E-Print Network (OSTI)

The differential affine velocity estimator (DAVE) developed in Schuck (2006) for estimating velocities from line-of-sight magnetograms is modified to directly incorporate horizontal magnetic fields to produce a differential affine velocity estimator for vector magnetograms (DAVE4VM). The DAVE4VM's performance is demonstrated on the synthetic data from the anelastic pseudospectral ANMHD simulations that were used in the recent comparison of velocity inversion techniques by Welsch (2007). The DAVE4VM predicts roughly 95% of the helicity rate and 75% of the power transmitted through the simulation slice. Inter-comparison between DAVE4VM and DAVE and further analysis of the DAVE method demonstrates that line-of-sight tracking methods capture the shearing motion of magnetic footpoints but are insensitive to flux emergence -- the velocities determined from line-of-sight methods are more consistent with horizontal plasma velocities than with flux transport velocities. These results suggest that previous studies that rely on velocities determined from line-of-sight methods such as the DAVE or local correlation tracking may substantially misrepresent the total helicity rates and power through the photosphere.

P. W. Schuck

2008-03-25T23:59:59.000Z

325

SINTERING METHOD  

DOE Patents (OSTI)

Methods of making articles by powder metallurgy techniques are presented. An article is made by packing a metal powder into a desired shape, raising the temperature of the powder compact to a sintering temperature in the presence of a reducing gas, and alternately increasing and decreasing the pressure of the gas while the temperatume is being raised. The product has a greater density than can be achieved by sintering for the same length of time at a constant gas pressure. (AEC)

Googin, J.M.

1963-11-01T23:59:59.000Z

326

Fabrication of Si nano-pillar array through Ni nano-dot mask using inductively coupled plasma  

E-Print Network (OSTI)

Fabrication of Si nano-pillar array through Ni nano-dot mask using inductively coupled plasma Mun-Dong, Jangan-Gu, Suwon, 440-746, South Korea Available online 9 September 2004 Abstract We formed Si nano-pillar array using inductively coupled plasma (ICP) etching of Si with Ni nano-dot mask. For the formation

Yeom, Geun Young

327

GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS, VOL. ???, XXXX, DOI:10.1029/, Effect of a metallic core on transient geomagnetic induction  

E-Print Network (OSTI)

on transient geomagnetic induction J. Vel´imsk´y,1 , C. C. Finlay2 1 Department of Geophysics, Faculty, 2:01pm D R A F T #12;X - 2 VEL´IMSK ´Y AND FINLAY: EFFECT OF CORE ON GEOMAGNETIC INDUCTION Abstract be correctly taken into account when mod- elling the geomagnetic field using modern observatory and satellite

Velímsky, Jakub

328

An optimal leakage detection strategy for underground pipelines using magnetic induction-based sensor networks  

Science Conference Proceedings (OSTI)

It is difficult to detect small leakages in underground pipelines with high accuracy and low-energy cost due to the inaccessible underground environments. To this end, the Magnetic Induction (MI)-based wireless sensor network for underground pipeline ... Keywords: deployment and activation of sensors, energy consumption, estimation accuracy, leakage detection and localization, underground pipelines

Xin Tan, Zhi Sun

2013-08-01T23:59:59.000Z

329

Detuning Detection in Induction Motors Hugo Rodriguez-Cortes, Christoforos N. Hadjicostis and Aleksandar M. Stankovic  

E-Print Network (OSTI)

such that the armature current distribution is fixed in space no matter what rotor speed exists. Thus, the field flux of this orthogonality is that the field flux is unaffected by the armature current so that, when the field flux is kept controlling the armature current. In induction motors field flux and armature MMF distributions

Stankoviæ, Aleksandar

330

Adjustable Speed Drive: Harmonic Effects on Induction Motors: Volumes 1 and 2  

Science Conference Proceedings (OSTI)

The use of adjustable speed drives (ASDs) for induction motors in electric power plants has several advantages, but ASDs produce harmonic current and voltage that can result in problems. The Standstill Frequency Response (RFR) program for the personal PC can be used to study these harmonic effects in a wide range of motors.

1995-11-08T23:59:59.000Z

331

Derivation of Induction Motor Equivalent Circuit Using Space-Phasor Concepts  

Science Conference Proceedings (OSTI)

The elements of space-phasor theory are discussed with application to the induction machine. The familiar derivation of resultant MMF for a three-phase winding is extended to give a definition of the current space-phasor. The ideas of space-phasor theory ...

Nicholas Zorbas; Bruce A. Neyland

1987-05-01T23:59:59.000Z

332

Adjustable Speed Drive: Harmonic Effects on Induction Motors: Volumes 1 and 2  

Science Conference Proceedings (OSTI)

The use of adjustable speed drives (ASDs) for induction motors in electric power plants has several advantages, but ASDs produce harmonic current and voltage that can result in problems. The Standstill Frequency Response (RFR) program for the personal PC can be used to study these harmonic effects in a wide range of motors.

1995-11-09T23:59:59.000Z

333

Determination of Mercury in Coal by Isotope Dilution Cold-Vapor Generation Inductively  

E-Print Network (OSTI)

Articles Determination of Mercury in Coal by Isotope Dilution Cold-Vapor Generation Inductively developed for high-accuracy determinations of mer- cury in bituminous and sub-bituminous coals. A closed- system digestion process employing a Carius tube is used to completely oxidize the coal matrix

334

SAT(ID): satisfiability of propositional logic extended with inductive definitions  

Science Conference Proceedings (OSTI)

We investigate the satisfiability problem, SAT(ID), of an extension of propositional logic with inductive definitions. We demonstrate how to extend existing SAT solvers to become SAT(ID) solvers, and provide an implementation on top of MiniSat. We also ...

Maarten Mariën; Johan Wittocx; Marc Denecker; Maurice Bruynooghe

2008-05-01T23:59:59.000Z

335

Control of Chlorine inductively coupled plasma using optical-emission spectroscopy  

Science Conference Proceedings (OSTI)

Magneto-resistive random access memory (MRAM) technology is recognized as one of the next key advances in computer memory. To create MRAM, various metals are successively laid down by sputtering to create stacks, which are then etched into suitable patterns. ... Keywords: ICP, MRAM, OES, chlorine, dry etching, inductively coupled plasma, online control, optical-emission spectroscopy, plasma-induced damage

R. B. Young; T. L. Scott; K. A. Prisbrey

2002-10-01T23:59:59.000Z

336

Rotor power feedback control of wind turbine system doubly-fed induction generator  

Science Conference Proceedings (OSTI)

The paper deals with a new system of wind turbine active power vector control. The already familiar cascade regulation with internal vector component feedback of rotor current and external active and reactive power feedbacks control of wind turbine has ... Keywords: DFIG rotor power regulator, doubly-fed induction generator, simulation, vector control

J. Smajo

2006-09-01T23:59:59.000Z

337

Searching for meaningful feature interactions with backward-chaining rule induction  

Science Conference Proceedings (OSTI)

Exploring the vast number of possible feature interactions in domains such as gene expression microarray data is an onerous task. We propose Backward-Chaining Rule Induction (BCRI) as a semi-supervised mechanism for biasing the search for plausible feature ...

Doug Fisher; Mary Edgerton; Lianhong Tang; Lewis Frey; Zhihua Chen

2005-09-01T23:59:59.000Z

338

Using virtual reality and mood-induction procedures to test products with consumers of ceramic tiles  

Science Conference Proceedings (OSTI)

This work describes a Virtual Reality Environment (VRE), through which users are able to view and test ceramic tile products. Users' virtual interfacing with the products generated emotional experiences that allowed them to feel ''engaged'' with the ... Keywords: Consumers, Mood-induction procedures, Product testing, Relaxation, Sense of presence, Virtual reality

Berenice Serrano; Cristina Botella; Rosa M. BañOs; Mariano AlcañIz

2013-05-01T23:59:59.000Z

339

Performance of Double-Output Induction Generator for Wind Energy Conversion Systems  

Science Conference Proceedings (OSTI)

With growing concerns about environmental pollution and a possible energy shortage, great efforts have been taken by the governments around the world to implement renewable energy programs, based mainly on wind power, solar energy, small hydro-electric ... Keywords: Double-output induction generator (DOIG), steady state model, field-oriented control, dynamic model, PWM converters

B. Chitti Babu; K. B. Mohanty; C. Poongothai

2008-07-01T23:59:59.000Z

340

Predictive Power Control of Doubly-Fed Induction Generator for Wave Energy Converters  

E-Print Network (OSTI)

the Doubly- fed induction generator (DFIG). This paper deals then with a model-based predictive power control of a DFIG-based Wave Energy Converter (WEC). In the proposed control approach, the predicted output power was calculated using a DFIG linearized state-space model. The DFIG-based WEC power tracking performances further

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "vlf induction method" 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

RTDS Based Maximal Power Point Tracking Simulation for Doubly-Fed Induction Generator  

Science Conference Proceedings (OSTI)

In the control of the wind generation, the maximal power point tracking (MPPT) control plays important role in the efficiency. This paper presents the simulation results of the MPPT control with RTDS-based DFIG model. At first, it analyzes the vector-control ... Keywords: Wind energy, DFIG((doubly-fed induction generator), Stator flux-oriented, Maximal power point tracking

Jiamin Zhang; Ancheng Xue; Tianshu Bi

2009-10-01T23:59:59.000Z

342

Simulation and Experimental Analysis of Grid-Connected Doubly-Fed Induction Generators  

Science Conference Proceedings (OSTI)

With the increase of wind generation penetration in power systems, it becomes more and more important to study its impact on power systems characteristics. The accurate dynamic modeling of wind plants is critical for the grid planning and operating studies. ... Keywords: doubly fed induction generator (DFIG), short-circuit test, model validation, transient stability

Guo Jiayang; Yu Xiao; Wu Tao; Chang Xianrong; Li Shanying; Liu Hui; Sun Yu

2010-06-01T23:59:59.000Z

343

Fault identification in doubly fed induction generator using FFT and neural networks  

Science Conference Proceedings (OSTI)

This paper presents a fault identification system for doubly fed induction generator (DFIG). It considers cases of single phase short-circuits and load switching. The system uses the fast fourier transform (FFT) to preprocessor data, which consist by ... Keywords: fast fourier transform, fault identification, neural network

Marcelo Patrício de Santana; José Roberto Boffino de Almeida Monteiro; Geyverson Teixeira de Paula; Thales Eugenio Portes de Almeida; Gustavo Bueno Romero; Júlio César Faracco

2012-08-01T23:59:59.000Z

344

The Influence of Electrical Parameters of Double Fed Induction Generator on the Transient Voltage Stability  

Science Conference Proceedings (OSTI)

This paper describes the effect of electrical parameters of the double fed induction generator on the transient voltage stability of a DFIG to a simple grid; the DFIG model has been developed in the Matlab/simulink tool. The dynamic behavior of a wind ... Keywords: DFIG model, electrical parameter, voltage stability, small signal analysis

Hongmei Li; Qiulan Wan; Zhaoxing Ma

2010-06-01T23:59:59.000Z

345

Reference value choice of the wind turbine active power with doubly-fed induction generator  

Science Conference Proceedings (OSTI)

The variable speed wind turbine with doubly-fed induction generator (DFIG) is today widely used concept. This paper presents a control system of the DFIG wind turbine with focus on the control strategies and on active power reference value choice. The ... Keywords: DFIG, dynamic simulation, reference value of active power, wind turbine

J. Smajo; M. Smajo; D. Vukadinovic

2005-11-01T23:59:59.000Z

346

Reliability analysis of fault tolerant wind energy conversion system with doubly fed induction generator  

Science Conference Proceedings (OSTI)

This paper deals with the design of a reliable fault tolerant converter topology for grid connected Wind Energy Conversion System (WECS) with Double Fed Induction Generator (DFIG) based on functional redundancy. The main contribution of the developed ... Keywords: Markov chain model, fault tolerant system, reliability analysis, wind energy conversion system

Philippe Weber; Florent Becker; Antoine Mathias; Didier Theilliol; Youmin M. Zhang

2012-10-01T23:59:59.000Z

347

Impact of Permanent Magnet Field on Inductance Variation of a PMLSM Julien Gomand1  

E-Print Network (OSTI)

of Surface Mounted Permanent Magnet Linear Synchronous Motors are generally presented with constantImpact of Permanent Magnet Field on Inductance Variation of a PMLSM Julien Gomand1 , Ghislain Remy1 Linear drive, Modelling, Estimation technique, Synchronous motor, Harmonics. Abstract Analytical models

Paris-Sud XI, Université de

348

Harmonic filters influences regarding the power quality on high frequency electrothermal installation with electromagnetic induction  

Science Conference Proceedings (OSTI)

This paper presents a study regarding the functioning of a melting/hardening electrothermal installation with electromagnetic induction from the point of view of generated harmonics in the power distribution. The authors made simulations in scope of ... Keywords: electrothermal installation, harmonic, passive filters, static converter

Raluca Rob; Ioan Sora; Caius Panoiu; Manuela Panoiu

2010-01-01T23:59:59.000Z

349

Magneto-inductive networked rescue system (MINERS): taking sensor networks underground  

Science Conference Proceedings (OSTI)

Wireless underground networks are an emerging technology which have application in a number of scenarios. For example, in a mining disaster, flooding or a collapse can isolate portions of underground tunnels, severing wired communication links and preventing ... Keywords: magnetic, magneto-inductive, mining, network, search and rescue, triaxial, underground

Andrew Markham; Niki Trigoni

2012-04-01T23:59:59.000Z

350

New Empirical Relationship between Thrust Coefficient and Induction Factor for the Turbulent Windmill State  

DOE Green Energy (OSTI)

Wind turbines sometimes experience the turbulent windmill state during startup or shutdown. This rarely happens during normal operation, so it has little effect on power curves or energy production. However, for completeness we need to be able to model situations where the axial induction factor exceeds 0.5. Classical momentum theory, which shows a relationship between the thrust coefficient and the axial induction factor, is not valid in this region. Glauert plotted some experimental data taken by Lock in the 1920s against this parabolic relationship and found very poor agreement for operation in this high-induction state. He proposed a new empirical relationship to fit the experimental data. Unfortunately, the new empirical curve does not account for tip or hub losses. Others have proposed multiplying the axial induction factor by the loss factor to correct the curve, but this still leaves a mathematical no-man's-land between the classical curve and the modified version of Glauert's empirical curve. The purpose of this paper is to document the derivation of a new curve that accounts for tip and hub losses and eliminates the numerical problems of the previous approaches.

Buhl, M.L., Jr.

2005-08-01T23:59:59.000Z

351

Voltage control of emerging distribution systems with induction motor loads using robust LQG approach  

E-Print Network (OSTI)

mode" in emerging distribution systems. The small-signal stability analysis indicates that load voltageVoltage control of emerging distribution systems with induction motor loads using robust LQG has significant performance to improve the voltage profile of the distributed generation system

Pota, Himanshu Roy

352

1999 Toyota RAV 4 EV Performance Characterization: Panasonic NiMH Battery -- Inductive Charging  

Science Conference Proceedings (OSTI)

This report characterizes the performance of a 1999 Toyota RAV 4 inductively-charged electric vehicle equipped with Panasonic Nickel Metal Hydride (NiMH) batteries. The tests performed were weight certification, range, vehicle performance, sound level tests, power quality evaluation, state of charge meter evaluation, and charger performance.

1999-12-15T23:59:59.000Z

353

Integration of Xantrex HY-100 Hybrid Inverter with an AC Induction Wind Turbine  

SciTech Connect

Several issues must be addressed before solid-state inverters can be used in wind-diesel systems with larger wind turbines. This project addresses those issues by using a commercial hybrid inverter designed for PV-diesel systems and modifying the inverter for use with an AC induction wind turbine. Another approach would have entailed building an inverter specifically for use with an AC induction wind turbine, but that was beyond the scope of this project. The inverter chosen for this project was a Xantrex HY-100, an inverter designed for PV systems. The unit consists of an inverter/rectifier bridge, a generator interface contactor, a battery charge controller, a hybrid controller, and the associated control electronics. Details of the inverter may be found in Appendix A. A twofold approach was taken to integrating the existing inverter for use with an AC induction wind turbine: 1) development of a detailed model to model both steady-state and transient behavior of the system, and 2) modification and testing of the inverter with an induction wind turbine based on the modeling results. This report describes these two tasks.

Corbus, D.; Newcomb, C.; Friedly, S.

2003-05-01T23:59:59.000Z

354

FPGA Implementation of Space Vector PWM Technique for Voltage Source Inverter Fed Induction Motor Drive  

Science Conference Proceedings (OSTI)

This paper presents implementation of Space Vector Pulse Width Modulation (SVPWM) technique for three phase Voltage Source Inverter (VSI) using Field Programmable Gate Array (FPGA). Variable voltage and frequency supply to ac drives is invariably obtained ... Keywords: VSI, SVPWM, FPGA, Induction Motor

R. Rajendran; N. Devarajan

2009-12-01T23:59:59.000Z

355

WELDING METHOD  

DOE Patents (OSTI)

A semi-automatic method is described for the weld joining of pipes and fittings which utilizes the inert gasshielded consumable electrode electric arc welding technique, comprising laying down the root pass at a first peripheral velocity and thereafter laying down the filler passes over the root pass necessary to complete the weld by revolving the pipes and fittings at a second peripheral velocity different from the first peripheral velocity, maintaining the welding head in a fixed position as to the specific direction of revolution, while the longitudinal axis of the welding head is disposed angularly in the direction of revolution at amounts between twenty minutas and about four degrees from the first position.

Cornell, A.A.; Dunbar, J.V.; Ruffner, J.H.

1959-09-29T23:59:59.000Z

356

Casting methods  

DOE Patents (OSTI)

A casting device includes a covered crucible having a top opening and a bottom orifice, a lid covering the top opening, a stopper rod sealing the bottom orifice, and a reusable mold having at least one chamber, a top end of the chamber being open to and positioned below the bottom orifice and a vacuum tap into the chamber being below the top end of the chamber. A casting method includes charging a crucible with a solid material and covering the crucible, heating the crucible, melting the material, evacuating a chamber of a mold to less than 1 atm absolute through a vacuum tap into the chamber, draining the melted material into the evacuated chamber, solidifying the material in the chamber, and removing the solidified material from the chamber without damaging the chamber.

Marsden, Kenneth C.; Meyer, Mitchell K.; Grover, Blair K.; Fielding, Randall S.; Wolfensberger, Billy W.

2012-12-18T23:59:59.000Z

357

Effect of capacitive coupling in a miniature inductively coupled plasma source  

SciTech Connect

Two-dimensional axisymmetric particle-in-cell simulations with a Monte Carlo collision algorithm (PIC-MCC) have been conducted to investigate the effect of capacitive coupling in a miniature inductively coupled plasma source (mICP) by using two models: an inductive model and a hybrid model. The mICP is 3 mm in radius and 6 mm in height with a three-turn planar coil, where argon plasma is sustained. In the inductive model, the coil is assumed to be electrostatically shielded, and thus the discharge is purely inductive coupling. In the hybrid model, we assume that the different turns of the coil act like electrodes in capacitive discharge to include the effect of capacitive coupling. The voltage applied to these electrodes decreases linearly from the powered end of the coil towards the grounded end. The numerical analysis has been performed for rf frequencies in the range of 100-1000 MHz, and the power absorbed by the plasma in the range of 5-50 mW at a fixed pressure of 500 mTorr. The PIC-MCC results show that potential oscillations at the plasma-dielectric interface are not negligible, and thus the major component of the absorbed power is caused by the axial motion of electrons in the hybrid model, although almost all of the power absorption is due to the azimuthal motion of electrons in the inductive model. The effect of capacitive coupling is more significant at lower rf frequencies and at higher absorbed powers under the calculation conditions examined. Moreover, much less coil currents are required in the hybrid model.

Takao, Yoshinori; Eriguchi, Koji; Ono, Kouichi [Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501 (Japan)

2012-11-01T23:59:59.000Z

358

Acetaminophen hepatotoxicity and HIF-1{alpha} induction in acetaminophen toxicity in mice occurs without hypoxia  

Science Conference Proceedings (OSTI)

HIF-1{alpha} is a nuclear factor important in the transcription of genes controlling angiogenesis including vascular endothelial growth factor (VEGF). Both hypoxia and oxidative stress are known mechanisms for the induction of HIF-1{alpha}. Oxidative stress and mitochondrial permeability transition (MPT) are mechanistically important in acetaminophen (APAP) toxicity in the mouse. MPT may occur as a result of oxidative stress and leads to a large increase in oxidative stress. We previously reported the induction of HIF-1{alpha} in mice with APAP toxicity and have shown that VEGF is important in hepatocyte regeneration following APAP toxicity. The following study was performed to examine the relative contribution of hypoxia versus oxidative stress to the induction of HIF-1{alpha} in APAP toxicity in the mouse. Time course studies using the hypoxia marker pimonidazole showed no staining for pimonidazole at 1 or 2 h in B6C3F1 mice treated with APAP. Staining for pimonidazole was present in the midzonal to periportal regions at 4, 8, 24 and 48 h and no staining was observed in centrilobular hepatocytes, the sites of the toxicity. Subsequent studies with the MPT inhibitor cyclosporine A showed that cyclosporine A (CYC; 10 mg/kg) reduced HIF-1{alpha} induction in APAP treated mice at 1 and 4 h and did not inhibit the metabolism of APAP (depletion of hepatic non-protein sulfhydryls and hepatic protein adduct levels). The data suggest that HIF-1{alpha} induction in the early stages of APAP toxicity is secondary to oxidative stress via a mechanism involving MPT. In addition, APAP toxicity is not mediated by a hypoxia mechanism.

Chaudhuri, Shubhra, E-mail: schaudhuri@uams.edu [Department of Pediatrics, University of Arkansas for Medical Sciences (United States); Arkansas Children's Hospital Research Institute, Little Rock, AR (United States); McCullough, Sandra S., E-mail: mcculloughsandras@uams.edu [Department of Pediatrics, University of Arkansas for Medical Sciences (United States); Arkansas Children's Hospital Research Institute, Little Rock, AR (United States); Hennings, Leah, E-mail: henningsleah@uams.edu [Department of Pathology, University of Arkansas for Medical Sciences (United States); Letzig, Lynda [Department of Pediatrics, University of Arkansas for Medical Sciences (United States); Arkansas Children's Hospital Research Institute, Little Rock, AR (United States); Simpson, Pippa M., E-mail: psimpson@mcw.edu [Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI (United States); Hinson, Jack A., E-mail: hinsonjacka@uams.edu [Department of Pharmacology and Toxicology, University of Arkansas for Medical Sciences (United States); James, Laura P., E-mail: lameslaurap@uams.edu [Department of Pediatrics, University of Arkansas for Medical Sciences (United States); Department of Pharmacology and Toxicology, University of Arkansas for Medical Sciences (United States); Arkansas Children's Hospital Research Institute, Little Rock, AR (United States)

2011-05-01T23:59:59.000Z

359

A comparison of three voting methods for bagging with the MLEM2 algorithm  

Science Conference Proceedings (OSTI)

This paper presents results of experiments on some data sets using bagging on the MLEM2 rule induction algorithm. Three different methods of ensemble voting, based on support (a non-democratic voting in which ensembles vote with their strengths), strength ...

Clinton Cohagan; Jerzy W. Grzymala-Busse; Zdzislaw S. Hippe

2010-09-01T23:59:59.000Z

360

Extended Development Work to Validate a HLW Calcine Waste Form via INL's Cold Crucible Induction Melter  

Science Conference Proceedings (OSTI)

To accomplish calcine treatment objectives, the Idaho Clean-up Project contractor, CWI, has chosen to immobilize the calcine in a glass-ceramic via the use of a Hot-Isostatic-Press (HIP); a treatment selection formally documented in a 2010 Record of Decision (ROD). Even though the HIP process may prove suitable for the calcine as specified in the ROD and validated in a number of past value engineering sessions, DOE is evaluating back-up treatment methods for the calcine as a result of the technical, schedule, and cost risk associated with the HIPing process. Consequently DOE HQ has requested DOE ID to make INL's bench-scale cold-crucible induction melter (CCIM) available for investigating its viability as a process alternate to calcine treatment. The waste form is the key component of immobilization of radioactive waste. Providing a solid, stable, and durable material that can be easily be stored is the rationale for immobilization of radioactive waste material in glass, ceramic, or glass-ceramics. Ceramic waste forms offer an alternative to traditional borosilicate glass waste forms. Ceramics can usually accommodate higher waste loadings than borosilicate glass, leading to smaller intermediate and long-term storage facilities. Many ceramic phases are known to possess superior chemical durability as compared to borosilicate glass. However, ceramics are generally multiphase systems containing many minor phase that make characterization and prediction of performance within a repository challenging. Additionally, the technologies employed in ceramic manufacture are typically more complex and expensive. Thus, many have proposed using glass-ceramics as compromise between in the more inexpensive, easier to characterize glass waste forms and the more durable ceramic waste forms. Glass-ceramics have several advantages over traditional borosilicate glasses as a waste form. Borosilicate glasses can inadvertently devitrify, leading to a less durable product that could crack during cooling and crystals may be prone to dissolution. By designing a glass-ceramics, the risks of deleterious effects from devitrification are removed. Furthermore, glass-ceramics have higher mechanical strength and impact strengths and possess greater chemical durability as noted above. Glass-ceramics should provide a waste form with the advantages of glass - ease of manufacture - with improved mechanical properties, thermal stability, and chemical durability. This report will cover aspects relevant for the validation of the CCIM use in the production of glass-ceramic waste forms.

James A. King; Vince Maio

2011-09-01T23:59:59.000Z

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


361

Systems and methods for commutating inductor current using a matrix converter  

DOE Patents (OSTI)

Systems and methods are provided for delivering current using a matrix converter in a vehicle. An electrical system comprises an AC interface, a first conversion module coupled to the AC interface, an inductive element coupled between the AC interface and the first conversion module, and a control module coupled to the first conversion module. The control module is configured to operate the first conversion module in a bidirectional operating mode to commutate current bidirectionally. When a magnitude of the current through the inductive element is greater than a first threshold value, the control module operates the conversion module in a unidirectional operating mode, wherein current is commutated unidirectionally.

Ransom, Ray M; Kajouke, Lateef A; Perisic, Milun

2012-10-16T23:59:59.000Z

362

Internal zone growth method for producing metal oxide metal eutectic composites  

DOE Patents (OSTI)

An improved method for preparing a cermet comprises preparing a compact having about 85 to 95 percent theoretical density from a mixture of metal and metal oxide powders from a system containing a eutectic composition, and inductively heating the compact in a radiofrequency field to cause the formation of an internal molten zone. The metal oxide particles in the powder mixture are effectively sized relative to the metal particles to permit direct inductive heating of the compact by radiofrequency from room temperature. Surface melting is prevented by external cooling or by effectively sizing the particles in the powder mixture.

Clark, Grady W. (Oak Ridge, TN); Holder, John D. (Knoxville, TN); Pasto, Arvid E. (Oak Ridge, TN)

1980-01-01T23:59:59.000Z

363

Proceedings of the North American Power Symposium NAPS, MIT, November 1996, pp.559-565. Bifurcation Analysis of Induction Motor Loads  

E-Print Network (OSTI)

Analysis of Induction Motor Loads for Voltage Collapse Studies Claudio A. Ca~nizares William Rosehart, aggregated loads, induction motor models, voltage collapse. I. Introduction Voltage stability problems- lapse of combined induction motor and impedance loads by means of lab measurements and computer

Cañizares, Claudio A.

364

Magnetic Alignment of Pulsed Solenoids Using the Pulsed Wire Method  

SciTech Connect

A unique application of the pulsed-wire measurement method has been implemented for alignment of 2.5 T pulsed solenoid magnets. The magnetic axis measurement has been shown to have a resolution of better than 25 {micro}m. The accuracy of the technique allows for the identification of inherent field errors due to, for example, the winding layer transitions and the current leads. The alignment system is developed for the induction accelerator NDCX-II under construction at LBNL, an upgraded Neutralized Drift Compression experiment for research on warm dense matter and heavy ion fusion. Precise alignment is essential for NDCX-II, since the ion beam has a large energy spread associated with the rapid pulse compression such that misalignments lead to corkscrew deformation of the beam and reduced intensity at focus. The ability to align the magnetic axis of the pulsed solenoids to within 100 pm of the induction cell axis has been demonstrated.

Arbelaez, D.; Madur, A.; Lipton, T.M.; Waldron, W.L.; Kwan, J.W.

2011-04-01T23:59:59.000Z

365

Inductive learning as a fusion engine for mine detection  

SciTech Connect

Semiotics is defined by some researchers as {open_quotes}the study of the appearance (visual or otherwise) meaning, and use of symbols and symbol systems.{close_quotes} Semiotic fusion of data from multiple sensory sources is a potential solution to the problem of landmine detection. This turns out to be significant, because notwithstanding the diversity of sensor technologies being used to attack the problem, there is no single effective landmine sensor technology. The only practical, general-purpose mine detector presently available is the trained dog. Most research into mine-detection technology seeds to emulate the dog`s seemingly uncanny abilities. An ideal data-fusion system would mimic animal reaction, with the brain`s perceptive power melding multiple sensory cues into an awareness of the size and location of a mine. Furthermore, the fusion process should be adaptive, with the skill at combining cues into awareness improving with experience. Electronic data-fusion systems reported in the countermine literature use conventional vector-based pattern recognition methods. Although neural nets are popular, they have never satisfactorily met the challenge. Despite years of investigation, nobody has ever found a vector space representation that reliably characterizes mine identity. This strongly suggests that the features have not been found because researchers have been looking for the wrong characteristics. It is worth considering that dogs probably do not represent data as mathematical number lists, but they almost certainly represent data via semiotic structures.

Kercel, S.W.; Dress, W.B.

1997-08-01T23:59:59.000Z

366

Investigation of Small Wind-Turbine Induction Generators : Final Technical Report, September 16, 1980-December 31, 1982.  

SciTech Connect

A new and accurate experimental set-up was developed to test induction machines in the 1-5 kW range. Two single-phase induction generators were tested - the Enertech 1500 and Enertech 1800. A detailed mathematical model to evaluate the performance of single-phase induction generators was developed and documented in the form of a FORTRAN computer simulation program. Then the program was used to analyze the Enertech 1800 and the results were compared with the test results. (LEW)

Venkata, Subrahmanyam S.; Boardman, Ethan C.

1982-01-01T23:59:59.000Z

367

Mouse Strain-Dependent Variations in Sensitivity to Induction of Gamma-H2AX  

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

Mouse Strain-Dependent Variations in Sensitivity to Induction of Gamma-H2AX Mouse Strain-Dependent Variations in Sensitivity to Induction of Gamma-H2AX Foci after Continuous Low Dose-Rate Irradiation: The Atm-/- vs Atm +/+ genotypes on Balb/c, 129S6, C57BL/6J, and A/J inbred strains J.R. Brogan Colorado State University Abstract We have recently developed a ‘low dose rate’ gamma-H2AX assay that is sufficiently sensitive to distinguish differences in response for cells from normal Atm +/+ (mouse) or ATM+/+ (human) and the phenotypes associated with the corresponding heterozygous genotypes(1, 2). The assay is also capable of distinguishing mild hypersensitivities for cells from an appreciable proportion of apparently normal individuals(3). We used this assay to determine whether the genetic background of four commonly used

368

High density growth of T7 expression strains with auto-induction option  

DOE Patents (OSTI)

A bacterial growth medium for promoting auto-induction of transcription of cloned DNA in cultures of bacterial cells grown batchwise is disclosed. The transcription is under the control of a lac repressor. Also disclosed is a bacterial growth medium for improving the production of a selenomethionine-containing protein or polypeptide in a bacterial cell, the protein or polypeptide being produced by recombinant DNA techniques from a lac or T7lac promoter, the bacterial cell encoding a vitamin B12-dependent homocysteine methylase. Finally, disclosed is a bacterial growth medium for suppressing auto-induction of expression in cultures of bacterial cells grown batchwise, said transcription being under the control of lac repressor.

Studier, F. William (Stony Brook, NY)

2010-07-20T23:59:59.000Z

369

Recent work on normal and superconducting inductive energy storage switching at the Efremov Institute, Leningrad, USSR  

DOE Green Energy (OSTI)

Various forms of switches for both normal and superconducting inductive energy storage have been devised and developed at NIIEFA. At the present time, however, a major portion of the efforts of the Institute in these fields is being applied to the design and construction of coils for tokamak ''T-10M.'' The superconducting toroidal field coils (the design of which is still uncertain) will be switched by simple switches made of Nb-Ti ribbon. The normal coils for the poloidal field will be switched by a simple metal contactor breaker. As the ''T-10M'' project proceeds, perhaps some of the innovative inductive storage and switching work can continue and when ''T-10M'' is complete, the basic research can resume at full level.

Machalek, M.D.

1977-01-01T23:59:59.000Z

370

Fuzzy Inductive Reasoning for Variable Selection Analysis and Modeling of Biological Systems  

E-Print Network (OSTI)

Fuzzy Inductive Reasoning (FIR) is a qualitative inductive modeling and simulation methodology for dealing with dynamical systems. It has proven to be a powerful tool for qualitative model identification and prediction of future behavior of various kinds of dynamical systems, especially from the soft sciences, such as biology, biomedicine, and ecology. This paper focuses on modeling aspects of the FIR methodology. It is shown that the FIR variable selection analysis is a useful tool not only for FIR but also for other classical quantitative methodologies such as NARMAX (Nonlinear AutoRegressive Moving Average modeling with eXternal inputs). The tool allows to obtain models that interpret a system under study in optimal ways, in the sense that these models are well suited for predicting the future behavior of the system they represent. The FIR variable selection analysis turns out to work well even in those applications where standard statistical variable selection analysis does not pro...

Angela Nebot; Francois E. Cellier; Ra' ul Carvajal V

1997-01-01T23:59:59.000Z

371

Design and code validation of the Jupiter inductive voltage adder (IVA) PRS driver  

SciTech Connect

The proposed Jupiter accelerator is a {approximately} 10-MV, 500-TW system capable of delivering 15-MJ kinetic energy to an imploding plasma radiation source (PRS). The accelerator is based on Hermes-III technology and contains 30 identical inductive voltage adder modules connected in parallel. The modules drive a common circular convolute electrode system in the center of which is located an imploding foil. The relatively high voltage of 8--10 MV is required to compensate for the voltage differential generated across the load due primarily to the fast increase in current (L di/dt) and to lesser extent to the increasing inductance(I dL/dt) and resistive component of the imploding foil. Here we examine the power flow through the device and, in particular, through the voltage adder and long MITL. Analytical models, such as pressure balance and parapotential flow, as well as circuit and PIC codes, were utilized. A new version of the TWOQUICK PIC code, which includes an imploding, cylindrical foil as load, was utilized to compare the power flow calculations done with SCREAMER and TRIFL. The agreement is very satisfactory and adds confidence to the Jupiter design. In addition, an experimental validation of the design is under way this year (FY95) with Hermes III. Long extension MITLs are connected at the end of the voltage adder with inductive and diode loads to benchmark the above design codes. In this paper we outline the accelerator`s conceptual design with emphasis on the power flow and coupling to the inductive load and include preliminary results of Hermes-III experimental design validation.

Mazarakis, M.G.; Poukey, J.W.; Mendel, C.W. [and others

1995-07-01T23:59:59.000Z

372

The Wanlass Polyphase Rotating Magnetic Device in Electric Motor and Induction Generator Applications  

E-Print Network (OSTI)

The electric motor in its present technological configuration has remained virtually unchanged since its original conception nearly 100 years ago. It would be logical to assume that a device, which has undergone such insignificant evolution, would have small impact with reference to industry. This paper will provide an introduction to the Wanlass technology and its application to induction motors and generators. This will be accomplished through analysis of motor and generator tests.

Asp, D. E.

1984-01-01T23:59:59.000Z

373

Induction of murine CYP1A2 gene expression by acenaphthylene  

E-Print Network (OSTI)

Acenaphthylene and related polynuclear aromatic hydrocarbons (PAH) are industrial combustion by-products which are also found in cooked foods. Recent studies in this laboratory have shown that acenaphthylene induces Cypla2 gene expression in mice and this study further investigates this induction response. Studies with six genetically-inbred strains of mice have shown that the activity of acenaphthylene (300 mg/kg) as an inducer of CYPlA2-dependent methoxyresorufin 0-demethylase (MROD) was age-and strain-dependent. The results showed that DBA mice, compared to the C57BL/6, C3H, CBA, A/j and SJL strains were most responsive to induction after a single dose of acenaphthylene (300 mg/kg). Hepatic MROD activity in acenaphthylene-treated DBA mice was induced 22-and 4-fold in males and females respectively. In contrast, a <2 to 4-fold induction of ethoxyresorufin 0-deethylase (EROD) activity was observed in both sexes. The other inbred strains had higher basal rates of hepatic MROD activity than the DBA strain, (i.e. C3H, C57BL/6, CBA, A/j and SJL). Differences in induction of MROD activity by acenaphthylene among the strains was primarily due to allelic variation (responsive or non responsive) at the aryl hydrocarbon (Ah) locus. Current studies are focused on further characterizing the strain-specific effects of acenaphthylene and related compounds and the molecular regulation of hepatic CYPlA2 gene expression in male and female DBA mice and other rodent species.

Miggins, John Wesley

1996-01-01T23:59:59.000Z

374

Etching characteristics of ZnO thin films in chlorine-containing inductively coupled plasmas  

Science Conference Proceedings (OSTI)

This study examined the plasma etching characteristics of ZnO thin films etched in BCl"3/Ar, BCl"3/Cl"2/Ar and Cl"2/Ar plasmas with a positive photoresist mask. The ZnO etch rates were increased in a limited way by increasing the gas flow ratio of the ... Keywords: BCl3, Chlorine, Inductively coupled plasma, Plasma etching, Zinc oxychloride, ZnO

S. W. Na; M. H. Shin; Y. M. Chung; J. G. Han; S. H. Jeung; J. H. Boo; N. -E. Lee

2006-02-01T23:59:59.000Z

375

Oil well diagnosis by sensing terminal characteristics of the induction motor  

E-Print Network (OSTI)

Abstract—Oil well diagnosis usually requires dedicated sensors placed on the surface and the bottom of the well. There is significant interest in identifying the characteristics of an oil well by using data from these sensors and neural networks for data processing. The purpose of this paper is to identify oil well parameters by measuring the terminal characteristics of the induction motor driving the pumpjack. Information about oil well properties is hidden in instantaneous power waveforms. The extraction of this information was done using neural networks. For the purpose of training neural networks, a complex model of the system, which included 25 differential equations, was developed. Successful application of neural networks was possible due to the proposed signal preprocessing which reduces thousands of measured data points into 20 scalar variables. The special input pattern transformation was used to enhance the power of the neural networks. Two training algorithms, originally developed by authors, were used in the learning process. The presented approach does not require special instrumentation and can be used on any oil well with a pump driven by an induction motor. The quality of the oil well could be monitored continuously and proper adjustments could be made. The approach may lead to significant savings in electrical energy, which is required to pump the oil. Index Terms—Induction motor, neural networks, oil well.

Bogdan M. Wilamowski; Okyay Kaynak; Senior Member

2000-01-01T23:59:59.000Z

376

Compilation of information on modeling of inductively heated cold crucible melters  

SciTech Connect

The objective of this communication, Phase B of a two-part report, is to present information on modeling capabilities for inductively heated cold crucible melters, a concept applicable to waste immobilization. Inductively heated melters are those in which heat is generated using coils around, rather than electrodes within, the material to be heated. Cold crucible or skull melters are those in which the melted material is confined within unmelted material of the same composition. This phase of the report complements and supplements Phase A by Loren Eyler, specifically by giving additional information on modeling capabilities for the inductively heated melter concept. Eyler discussed electrically heated melter modeling capabilities, emphasizing heating by electrodes within the melt or on crucible walls. Eyler also discussed requirements and resources for the computational fluid dynamics, heat flow, radiation effects, and boundary conditions in melter modeling; the reader is referred to Eyler`s discussion of these. This report is intended for use in the High Level Waste (HLW) melter program at Hanford. We sought any modeling capabilities useful to the HLW program, whether through contracted research, code license for operation by Department of Energy laboratories, or existing codes and modeling expertise within DOE.

Lessor, D.L.

1996-03-01T23:59:59.000Z

377

Voltage sag ride through using Improved Adaptive Internal Model Controller for doubly fed induction generator wind farms  

Science Conference Proceedings (OSTI)

This paper presents the effect of a single pulse dither signal injection in adaptive internal model controller for a doubly fed induction generator (DFIG)-based wind farm. Rotor current controller using adaptive internal model controller is designed ...

N. Amuthan, P. Subburaj, P. Melba Mary

2013-02-01T23:59:59.000Z

378

A test platform for measuring the energy efficiency of AC induction motors under various loading conditions and control schemes/  

E-Print Network (OSTI)

A test platform was developed to measure and compare the energy efficiency of an AC induction motor under steady-state and cyclical loading conditions while operating in both a constant speed mode and while performing speed ...

Granata, John A. (John Anthony)

2012-01-01T23:59:59.000Z

379

Laboratory Characterization of Advanced SO2 Control By-Products: Dry Sodium and Calcium In-Duct Injection Wastes  

Science Conference Proceedings (OSTI)

Extensive laboratory investigation indicates that the physical and chemical characterization and engineering properties of dry sodium and calcium in-duct injection wastes differ, as do the refuse and by-product management options associated with them. Utilities can use this report on the chemical, physical, engineering, and leachate properties of dry sodium and calcium in-duct injection wastes to better plan for and manage future waste disposal and/or use.

1990-01-08T23:59:59.000Z

380

FIRST VERY LOW FREQUENCY DETECTION OF SHORT REPEATED BURSTS FROM MAGNETAR SGR J1550-5418  

Science Conference Proceedings (OSTI)

We report on the first detection of ionospheric disturbances caused by short repeated gamma-ray bursts from the magnetar SGR J1550-5418. Very low frequency (VLF) radio wave data obtained in South America clearly show sudden amplitude and phase changes at the corresponding times of eight soft gamma-ray repeater bursts. Maximum amplitude and phase changes of the VLF signals appear to be correlated with the gamma-ray fluence. On the other hand, VLF recovery timescales do not show any significant correlation with the fluence, possibly suggesting that the bursts' spectra are not similar to each other. In summary, Earth's ionosphere can be used as a very large gamma-ray detector and the VLF observations provide us with a new method to monitor high-energy astrophysical phenomena without interruption such as Earth occultation.

Tanaka, Y. T.; Takahashi, T. [Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan); Raulin, Jean-Pierre; Bertoni, Fernando C. P. [CRAAM, Presbyterian Mackenzie University, Sao Paulo (Brazil); Fagundes, P. R. [University of Vale do Paraiba, Sao Jose dos Campos (Brazil); Chau, J. [Radio Observatorio de Jicamarca, Instituto GeofIsico del Peru, Lima, Peru (Peru); Schuch, N. J. [INPE's Southern Regional Space Research Center, Santa Maria (Brazil); Hayakawa, M.; Hobara, Y. [University of Electro-Communications (Japan); Terasawa, T., E-mail: tanaka@astro.isas.jaxa.j [Institute for Cosmic Ray Research, University of Tokyo (Japan)

2010-09-20T23:59:59.000Z

Note: This page contains sample records for the topic "vlf induction method" 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

Stress-induced VO{sub 2} films with M2 monoclinic phase stable at room temperature grown by inductively coupled plasma-assisted reactive sputtering  

SciTech Connect

We report on growth of VO{sub 2} films with M2 monoclinic phase stable at room temperature under atmospheric pressure. The films were grown on quartz glass and Si substrates by using an inductively coupled plasma-assisted reactive sputtering method. XRD-sin{sup 2}{Psi} measurements revealed that the films with M2 phase are under compressive stress in contrast to tensile stress of films with M1 phase. Scanning electron microscopy observations revealed characteristic crystal grain aspects with formation of periodical twin structure of M2 phase. Structural phase transition from M2 to tetragonal phases, accompanied by a resistance change, was confirmed to occur as the temperature rises. Growth of VO{sub 2} films composed of M2 phase crystalline is of strong interest for clarifying nature of Mott transition of strongly correlated materials.

Okimura, Kunio; Watanabe, Tomo [School of Engineering, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292 (Japan); Sakai, Joe [GREMAN, UMR 7347 CNRS, Universite Francois Rabelais de Tours, Parc de Grandmont 37200 Tours (France)

2012-04-01T23:59:59.000Z

382

2274 IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS, VOL. 9, NO. 4, NOVEMBER 2013 Rotor Bar Fault Monitoring Method Based on  

E-Print Network (OSTI)

utilizes the data analysis of the air-gap torque profile in conjunction with a Bayesian classifier, and abrupt load changes, which can produce bearing faults and rotor bar breakages. Meanwhile, electrical Monitoring Method Based on Analysis of Air-Gap Torques of Induction Motors Aderiano M. da Silva, Member, IEEE

Povinelli, Richard J.

383

Time-resolved studies of particle effects in laser ablation inductively coupled plasma-mass spectrometry  

Science Conference Proceedings (OSTI)

Time resolved signals in laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) are studied to determine the influence of experimental parameters on ICP-induced fractionation effects. Differences in sample composition and morphology, i.e., ablating brass, glass, or dust pellets, have a profound effect on the time resolved signal. Helium transport gas significantly decreases large positive signal spikes arising from large particles in the ICP. A binder for pellets also reduces the abundance and amplitude of spikes in the signal. MO{sup +} ions also yield signal spikes, but these MO{sup +} spikes generally occur at different times from their atomic ion counterparts.

Perdian, D.; Bajic, S.; Baldwin, D.; Houk, R.

2007-11-13T23:59:59.000Z

384

Inductive entanglement classification of four qubits under stochastic local operations and classical communication  

Science Conference Proceedings (OSTI)

Using an inductive approach to classify multipartite entangled states under stochastic local operations and classical communication introduced recently by the authors [Phys. Rev. A 74, 052336 (2006)], we give the complete classification of four-qubit entangled pure states. Apart from the expected degenerate classes, we show that there exist eight inequivalent ways to entangle four qubits. In this respect, permutation symmetry is taken into account and states with a structure differing only by parameters inside a continuous set are considered to belong to the same class.

Lamata, L.; Leon, J. [Instituto de Matematicas y Fisica Fundamental, CSIC, Serrano 113-bis, 28006 Madrid (Spain); Salgado, D. [Dpto. Fisica Teorica, Universidad Autonoma de Madrid, 28049 Cantoblanco, Madrid (Spain); Solano, E. [Physics Department, ASC, and CeNS, Ludwig-Maximilians-Universitaet, Theresienstrasse 37, 80333 Munich (Germany); Seccion Fisica, Departamento de Ciencias, Pontificia Universidad Catolica del Peru, Apartado Postal 1761, Lima (Peru)

2007-02-15T23:59:59.000Z

385

Magnetic induction technique for mapping vertical conductive fractures: theory of operation  

DOE Green Energy (OSTI)

Utilization of a hot dry rock geothermal resource requires circulation of a fluid (water) through fractures in the rock. The Los Alamos Scientific Laboratory is presently investigating the feasibility and economics of tapping this energy resource. Presently, the fractures in the rock are created by conventional hydraulic fracturing techniques. Accurate determination of the geometry of the fracture system is required so that boreholes may be drilled to complete the circulation system. The theory of a technique designed to map vertical conductive fractures located in resistive rock is presented. The technique is based on magnetic induction. Fracture thickness and strike can be determined from measurements made in a single borehole.

Not Available

1978-07-01T23:59:59.000Z

386

A Real-Time Simulator for Doubly Fed Induction Generator based Wind Turbine Applications  

E-Print Network (OSTI)

Abstract- This paper describes a real-time simulator of wind turbine generator system suitable for controller design and tests. The simulated generator is a grid-connected doubly fed induction machine with back-to-back PWM voltage source vector control of the rotor. The simulator is based on RT-LAB real-time simulation platform that allows for easy model-to-real-time-target design from Simulink models. The paper puts special emphasis on the fixed-step simulation problematic of kHz-range PWM inverter drives and the techniques used in the real-time simulator to accurately simulate those drives.

Christian Dufour; Jean Bélanger

2004-01-01T23:59:59.000Z

387

The pulsed linear induction motor concept for high-speed trains  

Science Conference Proceedings (OSTI)

The SERAPBIM (SEgmented RAil PHased Induction Motor) concept is a linear induction motor concept which uses rapidly-pulsed magnetic fields and a segmented reaction rail, as opposed to low-frequency fields and continuous reaction rails found in conventional linear induction motors. These improvements give a high-traction, compact, and efficient linear motor that has potential for advanced high speed rail propulsion. In the SERAPBIM concept, coils on the vehicle push against a segmented aluminum rail, which is mounted on the road bed. Current is pulsed as the coils cross an edge of the segmented rail, inducing surface currents which repel the coil. The coils must be pulsed in synchronization with the movement by reaction rail segments. This is provided by a sense-and-fire circuit that controls the pulsing of the power modulators. Experiments were conducted to demonstrate the feasibility of the pulsed induction motor and to collect data that could be used for scaling calculations. A 14.4 kg aluminum plate was accelerated down a 4 m track to speeds of over 15 m/sec with peak thrust up to 18 kN per coilset. For a trainset capable of 200 mph speed, the SERAPHIM concept design is based on coils which are each capable of producing up to 3.5 kN thrust, and 30 coil pairs are mounted on each power car. Two power cars, one at each end of the train, provide 6 MW from two gas turbine prime power units. The thrust is about 210.000 N and is essentially constant up to 200 km/hr since wheel slippage does not limit thrust as with conventional wheeled propulsion. A key component of the SERAPHIM concept is the use of passive wheel-on-rah support for the high speed vehicle. Standard steel wheels are capable of handling over 200 mph. The SERAPHIM cost is comparable to that for steel-wheel high-speed rail, and about 10% to 25% of the projected costs for a comparable Maglev system.

Turman, B.N.; Marder, B.M.; Rohwein, G.J.; Aeschliman, D.P.; Kelley, J.B.; Cowan, M.; Zimmerman, R.M.

1995-06-01T23:59:59.000Z

388

Optical diagnostics for a high power, rf-inductively coupled plasma  

SciTech Connect

Emission spectroscopy and laser-induced fluorescence have been used to monitor the field and tail-flame regions of a Hull-design inductively coupled plasma. This plasma is used for a variety of syntheses including SiC, TiC, BN, A1N and diamond. Temporally- and spatially-resolved spectra of both pure Ar and Ar/gas mixtures have been studied as a function of RF power, pressure and flow rate. Preliminary data suggest that the system is far from local thermodynamic equilibrium.

Nogar, N.S.; Keaton, G.L.; Anderson, J.E.; Trkula, M.

1988-01-01T23:59:59.000Z

389

A novel self-excited self-regulated single phase induction generator  

Science Conference Proceedings (OSTI)

This paper describes a newly developed single-phase capacitor self-excited induction generator with self-regulating features, suitable for engine-driven portable gen-sets for autonomous/standby power generation. The system is also suitable for microhydro and wind energy systems. The generator has two specially designed stator windings in quadrature, connected externally to a shunt and a series capacitor respectively. It employs a standard die-cast squirrel cage rotor. Special features, advantages and theoretical concepts of the system are highlighted in this part of the paper, detailed experimental results being presented in Part 2.

Murthy, S.S. (Indian Inst. of Tech., Delhi, New Delhi (India). Dept. of Electrical Engineering)

1993-09-01T23:59:59.000Z

390

The time evolution of the resistances and inductances of the discharges in a pulsed gas laser through its current waveforms  

SciTech Connect

In the present work, the time-dependent resistances and inductances of the electric discharges in a pulsed gas laser are revealed through the current waveforms of the circuit. This can be achieved combining step-by-step the experimental current waveforms with the current differential equations of the system. Thus, digitizing the signal, the derivative is calculated through a computer. For a certain time instant, substituting the values of the current and its derivative into the integrodifferential equations describing the performance of the circuit loops, the authors form relationships which connect the values of the resistance and inductance for this particular time instant. Combining relationships originating from very close adjacent time instants, the values of the resistances and inductances of the discharges are revealed. Their behavior shows an abrupt drop for the resistances and a sharp peak for the inductances, both during the formation phase. After that, the above characteristic quantities fluctuate slowly around constant values. The sharp drop of the resistances was expected, bearing in mind that the number of the charges increases dramatically through the electron avalanche multiplication during the first few nanoseconds, causing the abrupt reduction of the resistances. On the other hand, the sharp peak of the inductances was unexpected. A plausible explanation for this phenomenon is that the plasma undergoes a temporary constriction which is due to the predominant attractive magnetic forces during the formation phase of the discharge.

Persephonis, P.; Giannetas, V.; Ioannou, A.; Parthenios, J.; Georgiades, C. [Univ. of Patras (Greece). Dept. of Physics

1996-08-01T23:59:59.000Z

391

A comparative integrated transcript analysis and functional characterization of differential mechanisms for induction of liver hypertrophy in the rat  

SciTech Connect

The main goal of the present work was to better understand the molecular mechanisms underlying liver hypertrophy (LH), a recurrent finding observed following acute or repeated drug administration to animals, using transcriptomic technologies together with the results from conventional toxicology methods. Administration of 5 terminated proprietary drug candidates from participating companies involved in the EU Innomed PredTox Project or the reference hepatotoxicant troglitazone to rats for up to a 14-day duration induced LH as the main liver phenotypic toxicity outcome. The integrated analysis of transcriptomic liver expression data across studies turned out to be the most informative approach for the generation of mechanistic models of LH. In response to a xenobiotic stimulus, a marked increase in the expression of xenobiotic metabolizing enzymes (XME) was observed in a subset of 4 studies. Accumulation of these newly-synthesized proteins within the smooth endoplasmic reticulum (SER) would suggest proliferation of this organelle, which most likely is the main molecular process underlying the LH observed in XME studies. In another subset of 2 studies (including troglitazone), a marked up-regulation of genes involved in peroxisomal fatty acid {beta}-oxidation was noted, associated with induction of genes involved in peroxisome proliferation. Therefore, an increase in peroxisome abundance would be the main mechanism underlying LH noted in this second study subset. Together, the use of transcript profiling provides a means to generate putative mechanistic models underlying the pathogenesis of liver hypertrophy, to distinguish between subtle variations in subcellular organelle proliferation and creates opportunities for improved mechanism-based risk assessment.

Boitier, Eric, E-mail: eric.boitier@sanofi-aventis.com [sanofi aventis R and D, Disposition, Safety and Animal Research, Vitry sur Seine (France); Amberg, Alexander [sanofi aventis R and D, Disposition, Safety and Animal Research, Frankfurt (Germany); Barbie, Valerie [Merck Serono S.A., Stratified Medicine, Geneva (Switzerland); Blichenberg, Arne [Nycomed GmbH, Institute for Pharmacology and Preclinical Drug Safety, Barsbuettel (Germany); Brandenburg, Arnd; Gmuender, Hans [Genedata AG, Basel (Switzerland); Gruhler, Albrecht [Novo Nordisk A/S, Protein Science, Malov (Denmark); McCarthy, Diane [Bio-Rad Laboratories, Hercules, CA (United States); Meyer, Kirstin; Riefke, Bjoern; Raschke, Marian [Bayer Schering Pharma AG, Investigational Toxicology, Berlin (Germany); Schoonen, Willem [MSD, Toxicology and Drug Disposition, Oss (Netherlands); Sieber, Maximilian [Universitaet Wuerzburg, Institut fuer Toxikologie, Wuerzburg (Germany); Suter, Laura [Hoffmann-La Roche Ltd., Investigative Toxicology, Basel (Switzerland); Thomas, Craig E. [Eli Lilly and Company, Investigative Toxicology, Indianapolis, IN (United States); Sajot, Nicolas [Servier, Drug Safety Assessment, Orleans-Gidy (France)

2011-04-15T23:59:59.000Z

392

A novel self-excited self-regulated single phase induction generator; Part II: Experimental investigation  

Science Conference Proceedings (OSTI)

Part 1 of this paper presents the basic system, theoretical modeling and typical test results of a novel Self-Excited Regulated Induction Generator. In this part the results of a detailed experimental investigation are presented to assess its suitability for practical applications. The steady state performance of the self-excited single phase induction generator (SEIG), maintaining the terminal voltage within a close range is investigated under realistic loading conditions in the laboratory. Detailed experimental results are presented and discussed. Necessary tests to obtain machine parameters for theoretical modeling are also developed and relevant results of the prototype presented. The effects of series and shunt capacitors, prime mover speed, load and load power factor are investigated. It has been shown to exhibit better voltage waveform as compared to commercially available sets. The experimental results confirm that this new generating system can be favorably employed for use as a small portable generator driven by nearly constant speed prime movers such as oil engines or Hydro Turbines.

Murthy, S.S.; Tandon, A.K. (Indian Inst. of Tech., Delhi, New Delhi (India). Dept. of Electrical Engineering); Rai, H.C. (Jamia Millia Islania, New Delhi (India). Dept. of Electrical Engineering)

1993-09-01T23:59:59.000Z

393

Evaluation of half wave induction motor drive for use in passenger vehicles. Final report  

SciTech Connect

This report describes research performed to devise and design a lower cost inverter-induction motor drive for electrical propulsion of passenger vehicles. A two-phase inverter-motor system is recommended. It is predicted to provide comparable vehicle performance, improved reliability and nearly a 10% cost advantage for a high production vehicle because of the reduction in total parts count, decreased total rating of the power semiconductor switches and somewhat simpler control hardware compared to the conventional three-phase bridge inverter-motor drive system. The major disadvantages of the two-phase inverter-motor drive are that the tow-phase motor is larger and more expensive than a three-phase machine, the design of snubbers for the power switches is difficult because motor lead and bifilar winding leakage inductances produce higher transient voltages, and the torque pulsations are relatively large because of the necessity to limit the inverter switching frequency to achieve high efficiency. An actuall model of the two-phase system must be constructed and evaluated. The most challenging engineering design task will be to design the inverter, motor and snubber circuits to minimize transient voltages with high system efficiency.

Hoft, R.G.; Kawamura, A.; Goodarzi, A.; Yang, G.Q.; Erickson, C.L.

1985-05-01T23:59:59.000Z

394

Announcing Amended Methods  

Science Conference Proceedings (OSTI)

Amended records are those methods with changes published after the official printing date of September 1st, 2011 Announcing Amended Methods Official Methods and Recommended Practices of the AOCS (Methods) aocs applicants certified chemist chemists

395

Energetic electron avalanches and mode transitions in planar inductively coupled radio-frequency driven plasmas operated in oxygen  

Science Conference Proceedings (OSTI)

Space and phase resolved optical emission spectroscopic measurements reveal that in certain parameter regimes, inductively coupled radio-frequency driven plasmas exhibit three distinct operation modes. At low powers, the plasma operates as an alpha-mode capacitively coupled plasma driven through the dynamics of the plasma boundary sheath potential in front of the antenna. At high powers, the plasma operates in inductive mode sustained through induced electric fields due to the time varying currents and associated magnetic fields from the antenna. At intermediate powers, close to the often observed capacitive to inductive (E-H) transition regime, energetic electron avalanches are identified to play a significant role in plasma sustainment, similar to gamma-mode capacitively coupled plasmas. These energetic electrons traverse the whole plasma gap, potentially influencing plasma surface interactions as exploited in technological applications.

Zaka-ul-Islam, M.; Niemi, K. [Centre for Plasma Physics, School of Mathematics and Physics, Queen's University Belfast, University Road, Belfast BT7 1NN, Northern Ireland (United Kingdom); Gans, T.; O'Connell, D. [Centre for Plasma Physics, School of Mathematics and Physics, Queen's University Belfast, University Road, Belfast BT7 1NN, Northern Ireland (United Kingdom); York Plasma Institute, Department of Physics, University of York, Innovation Way, Heslington York YO10 5DQ (United Kingdom)

2011-07-25T23:59:59.000Z

396

Nuclear Analytical Methods  

Science Conference Proceedings (OSTI)

... Nuclear Analytical Methods. Research activities in the Nuclear Analytical Methods Group are focused on the science that ...

397

Method for leveling the power output of an electromechanical battery as a function of speed  

SciTech Connect

The invention is a method of leveling the power output of an electromechanical battery during its discharge, while at the same time maximizing its power output into a given load. The method employs the concept of series resonance, employing a capacitor the parameters of which are chosen optimally to achieve the desired near-flatness of power output over any chosen charged-discharged speed ratio. Capacitors are inserted in series with each phase of the windings to introduce capacitative reactances that act to compensate the inductive reactance of these windings. This compensating effect both increases the power that can be drawn from the generator before inductive voltage drops in the windings become dominant and acts to flatten the power output over a chosen speed range. The values of the capacitors are chosen so as to optimally flatten the output of the generator over the chosen speed range.

Post, Richard F. (Walnut Creek, CA)

1999-01-01T23:59:59.000Z

398

Sampling and analysis methods for geothermal fluids and gases  

DOE Green Energy (OSTI)

The sampling procedures for geothermal fluids and gases include: sampling hot springs, fumaroles, etc.; sampling condensed brine and entrained gases; sampling steam-lines; low pressure separator systems; high pressure separator systems; two-phase sampling; downhole samplers; and miscellaneous methods. The recommended analytical methods compiled here cover physical properties, dissolved solids, and dissolved and entrained gases. The sequences of methods listed for each parameter are: wet chemical, gravimetric, colorimetric, electrode, atomic absorption, flame emission, x-ray fluorescence, inductively coupled plasma-atomic emission spectroscopy, ion exchange chromatography, spark source mass spectrometry, neutron activation analysis, and emission spectrometry. Material on correction of brine component concentrations for steam loss during flashing is presented. (MHR)

Watson, J.C.

1978-07-01T23:59:59.000Z

399

Electrohydrodynamic induction and conduction pumping of dielectric liquid film: theoretical and numerical studies  

E-Print Network (OSTI)

Electrohydrodynamic (EHD) pumping of single and two-phase media is attractive for terrestrial and outer space applications since it is non-mechanical, lightweight, and involves no moving parts. In addition to pure pumping purposes, EHD pumps are also used for the enhancement of heat transfer, as an increase in mass transport often translates to an augmentation of the heat transfer. Applications, for example, include two-phase heat exchangers, heat pipes, and capillary pumping loops. In this research, EHD induction pumping of liquid film in annular horizontal and vertical configurations is investigated. A non-dimensional analytical model accounting for electric shear stress existing only at the liquid/vapor interface is developed for attraction and repulsion pumping modes. The effects of all involved parameters including the external load (i.e. pressure gradient) and gravitational force on the nondimensional interfacial velocity are presented. A non-dimensional stability analysis of EHD induction pumping of liquid film in a vertical annular configuration in the presence of external load for repulsion mode is carried out. A general non-dimensional stability criterion is presented. Stability maps are introduced allowing classification of pump operation as stable or unstable based on the input operating parameters. An advanced numerical model accounting for the charges induced throughout the bulk of the fluid due to the temperature gradient for EHD induction pumping of liquid film in a vertical annular configuration is derived. A non-dimensional parametric study including the effects of external load is carried out for different entrance temperature profiles and in the presence of Joule heating. Finally, a non-dimensional theoretical model is developed to investigate and to understand the EHD conduction phenomenon in electrode geometries capable of generating a net flow. It is shown that with minimal drag electrode design, the EHD conduction phenomenon is capable of providing a net flow. The theoretical model is further extended to study the effect of EHD conduction phenomenon for a two-phase flow (i.e. a stratified liquid/ vapor medium). The numerical results presented confirm the concept of liquid film net flow generation with the EHD conduction mechanism.

Al Dini, Salem A. S.

2005-12-01T23:59:59.000Z

400

Low Dose Radiation Research Program: The Risk of Cancer Induction Due to  

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

November 10-12, 1999, Washington, D.C. November 10-12, 1999, Washington, D.C. The Risk of Cancer Induction Due to Routine Mammographic Screening Featured Project Description David J. Brenner, Steve Marino, and Charles Geard, Center for Radiological Research, Columbia University, 630 West 168th Street, New York Summary: To obtain realistic and credible risk estimates for breast-cancer mortality due to clinical mammographic imaging examinations. Abstract: The aim of this work is to obtain realistic and credible risk estimates for breast-cancer mortality due to clinical mammographic imaging examinations. Given the increasing emphasis on clinical mammographic screening for breast cancer, it is of societal importance to provide realistic risk estimates with realistic confidence bounds for breast cancer

Note: This page contains sample records for the topic "vlf induction method" from the National Library of EnergyBeta (NLEBeta).
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401

Donald J. Cram, Host-Guest Chemistry, Cram's Rule of Asymmetric Induction  

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

Donald J. Cram, Host-Guest Chemistry, Cram's Rule of Asymmetric Induction and Carceplexes Resources with Additional Information · Research Highlights · Cram Honored Donald J. Cram Courtesy of UCLA Photography Donald J. Cram ... taught and conducted research at UCLA for more than 50 years ... . A chemist at UCLA since 1947, Cram opened broad new avenues for exploration across organic chemistry, with applications in both basic research as well as specific fields, such as pharmaceutical production and the medical testing industry. Don's brilliant creativity, integrity, and enthusiasm for life and science have forever changed "teaching in organic chemistry, and altered the shape and substance of the chemical research frontier," said M. Frederick Hawthorne, university professor of chemistry at UCLA and one of Cram's earliest graduate students. "Don was a giant in organic chemistry; his research affects the many ways organic chemistry now appears in our daily lives."

402

Apparatus having inductively coupled coaxial coils for measuring buildup of slay or ash in a furnace  

DOE Patents (OSTI)

The buildup of slag or ash on the interior surface of a furnace wall is monitored by disposing two coils to form a transformer which is secured adjacent to the inside surface of the furnace wall. The inductive coupling between the two coils of the transformer is affected by the presence of oxides of iron in the slag or ash which is adjacent to the transformer, and the application of a voltage to one winding produces a voltage at the other winding that is related to the thickness of the slag or ash buildup on the inside surface of the furnace wall. The output of the other winding is an electrical signal which can be used to control an alarm or the like or provide an indication of the thickness of the slag or ash buildup at a remote location.

Mathur, Mahendra P. (Pittsburgh, PA); Ekmann, James M. (Bethel Park, PA)

1989-01-01T23:59:59.000Z

403

Development of a 402.5 MHz 140 kW Inductive Output Tube  

SciTech Connect

This report contains the results of Phase I of an SBIR to develop a Pulsed Inductive Output Tube (IOT) with 140 kW at 400 MHz for powering H-proton beams. A number of sources, including single beam and multiple beam klystrons, can provide this power, but the IOT provides higher efficiency. Efficiencies exceeding 70% are routinely achieved. The gain is typically limited to approximately 24 dB; however, the availability of highly efficient, solid state drivers reduces the significance of this limitation, particularly at lower frequencies. This program initially focused on developing a 402 MHz IOT; however, the DOE requirement for this device was terminated during the program. The SBIR effort was refocused on improving the IOT design codes to more accurately simulate the time dependent behavior of the input cavity, electron gun, output cavity, and collector. Significant improvement was achieved in modeling capability and simulation accuracy.

R. Lawrence Ives; Michael Read, Robert Jackson

2012-05-09T23:59:59.000Z

404

Flow and temperature fields in a free discharge inductively coupled plasma  

SciTech Connect

Computations were made of the flow and temperature fields in an inductively coupled argon plasma at atmospheric pressure under confined and free discharge conditions. The model takes into account gravity effects and swirl in the sheath gas. Natural convection was found to have a negligible effect on the flow and temperature fields under confined discharge conditions but a significant effect for the free discharge. The back flow in the discharge was substantially reduced in the presence of swirl for swirl velocities over the range 0-50 m/s. Also with a mode-rate increase in swirl, the conduction heat flux to the wall decreased but increased with the further increase in swirl. From an overall energy balance point of view, conductive heat flux to the wall of the plasma confinement tube was substantially lower for a free plasma discharge compared to that for a confined plasma.

Gagne, R.; Boulos, M.I.; Barnes, R.M.

1979-01-01T23:59:59.000Z

405

Two-dimensional modeling of high plasma density inductively coupled sources for materials processing  

SciTech Connect

Inductively coupled plasma sources are being developed to address the need for high plasma density (10[sup 11]--10[sup 12] cm[sup [minus]3]), low pressure (a few to 10--20 mTorr) etching of semiconductor materials. One such device uses a flat spiral coil of rectangular cross section to generate radio-frequency (rf) electric fields in a cylindrical plasma chamber, and capacitive rf biasing on the substrate to independently control ion energies incident on the wafer. To investigate these devices we have developed a two-dimensional hybrid model consisting of electromagnetic, electron Monte Carlo, and hydrodynamic modules; and an off line plasma chemistry Monte Carlo simulation. The results from the model for plasma densities, plasma potentials, and ion fluxes for Ar, O[sub 2], Ar/CF[sub 4]/O[sub 2] gas mixtures will be presented.

Ventzek, P.L.G.; Hoekstra, R.J.; Kushner, M.J. (Department of Electrical and Computer Engineering, University of Illinois, Urbana, Illinois 61801 (United States))

1994-01-01T23:59:59.000Z

406

Nonlinear Dual-Mode Control of Variable-Speed Wind Turbines with Doubly Fed Induction Generators  

E-Print Network (OSTI)

This paper presents a feedback/feedforward nonlinear controller for variable-speed wind turbines with doubly fed induction generators. By appropriately adjusting the rotor voltages and the blade pitch angle, the controller simultaneously enables: (a) control of the active power in both the maximum power tracking and power regulation modes, (b) seamless switching between the two modes, and (c) control of the reactive power so that a desirable power factor is maintained. Unlike many existing designs, the controller is developed based on original, nonlinear, electromechanically-coupled models of wind turbines, without attempting approximate linearization. Its development consists of three steps: (i) employ feedback linearization to exactly cancel some of the nonlinearities and perform arbitrary pole placement, (ii) design a speed controller that makes the rotor angular velocity track a desired reference whenever possible, and (iii) introduce a Lyapunov-like function and present a gradient-based approach for mini...

Tang, Choon Yik; Jiang, John N

2010-01-01T23:59:59.000Z

407

Multielement analysis of geologic materials by inductively coupled plasma-atomic emission spectroscopy  

DOE Green Energy (OSTI)

Atomic emission spectroscopy using an inductively coupled plasma (ICP) source permits the rapid acquisition of multielement geochemical data from a wide variety of geologic materials. Rocks or other solid samples are taken into solution with a four acid digestion procedure and introduced directly into the plasma; fluid samples are acidified or analyzed directly. The entire process is computer-controlled, fully-automated, and requires less than five minutes per sample for quantitative determination of 37 elements. The procedures and instrumentation employed at the ESL for multielement ICP analysis of geologic materials are described and these are intended as a guide for evaluating analytic results reported from this laboratory. The quality of geochemical data can be characterized by precision, limits of quantitative determination, and accuracy. Precision values are a measure of the repeatability of analyses. In general, major element and analyses have precision of better than 5% and trace elements of better than 10% of the amount present. (MHR)

Christensen, O.D.; Kroneman, R.L.; Capuano, R.M.

1980-03-01T23:59:59.000Z

408

A 350 MHz, 200 kW CW, Multiple Beam Inductive Output Tube - Final Report  

SciTech Connect

This program developed a 200 kW CW, 350 MHz, multiple beam inductive output tube (MBIOT) for driving accelerator cavities. The MBIOT operates at 30 kV with a gain of 23 dB. The estimated efficiency is 70%. The device uses seven electron beams, each transmitting 1.4 A of current. The tube is approximately six feet long and weighs approximately 400 lbs. The prototype device will be evaluated as a potential RF source for the Advanced Photon Source at Argonne National Laboratory (ANL). Because of issues related to delivery of the electron guns, it was not possible to complete assembly and test of the MBIOT during the Phase II program. The device is being completed with support from Calabazas Creek Research, Inc., Communications & Power Industries, LLC. and the Naval Surface Weapons Center (NSWC) in Dahlgren, VA. The MBIOT will be initially tested at NSWC before delivery to ANL. The testing at NSWC is scheduled for February 2013.

R.Lawrece Ives; George Collins; David Marsden Michael Read; Edward Eisen; Takuchi Kamura, Philipp Borchard

2012-11-28T23:59:59.000Z

409

Field-Reversed Configuration Formation Scheme Utilizing a Spheromak and Solenoid Induction  

Science Conference Proceedings (OSTI)

A new field-reversed configuration (FRC) formation technique is described, where a spheromak transitions to a FRC with inductive current drive. The transition is accomplished only in argon and krypton plasmas, where low-n kink modes are suppressed; spheromaks with a lighter majority species, such as neon and helium, either display a terminal tilt-mode, or an n=2 kink instability, both resulting in discharge termination. The stability of argon and krypton plasmas through the transition is attributed to the rapid magnetic diffusion of the currents that drive the kink-instability. The decay of helicity during the transition is consistent with that expected from resistivity. This observation indicates a new scheme to form a FRC plasma, provided stability to low-n modes is maintained, as well as a unique situation where the FRC is a preferred state.

S.P. Gerhardt, E.V. Belova, M. Yamada, H. Ji, Y. Ren, B. McGeehan, and M. Inomoto

2008-06-12T23:59:59.000Z

410

Two-dimensional fluid model simulation of bell jar top inductively coupled plasma  

SciTech Connect

In the present paper, argon (Ar) plasmas in a bell jar inductively coupled plasma (ICP) source are systematically studied over pressures from 5 to 20 mtorr and power inputs from 0.2 to 0.5 kW. In this study, both a two-dimensional (2-D) fluid model simulation and global model calculation are compared. The 2-D fluid model simulation with a self-consistent power deposition is developed to describe the Ar plasma behavior as well as predict the plasma parameter distributions. Finally, a quantitative comparison between the global model and the fluid model is made to test their validity. Low-pressure ICP has been employed for etching processing for the last few years.

Wu, H.M.; Yu, B.W. [CFD Research Corp., Huntsville, AL (United States); Li, M. [Univ. of California, Berkeley, CA (United States). Dept. of Chemical Engineering; Yang, Y. [Chinese Academy of Sciences, Beijing (China). Inst. of Mechanics

1997-02-01T23:59:59.000Z

411

A comprehensive study of different gases in inductively coupled plasma torch operating at one atmosphere  

SciTech Connect

A numerical study is done to understand the possible operating regimes of RF-ICP torch (3 MHz, 50 kW) using different gases for plasma formation at atmospheric pressure. A two dimensional numerical simulation of RF-ICP torch using argon, nitrogen, oxygen, and air as plasma gas has been investigated using computational fluid dynamic (CFD) software fluent{sup (c)}. The operating parameters varied here are central gas flow, sheath gas flow, RF-power dissipated in plasma, and plasma gas. The temperature contours, flow field, axial, and radial velocity profiles were investigated under different operating conditions. The plasma resistance, inductance of the torch, and the heat distribution for various plasma gases have also been investigated. The plasma impedance of ICP torch varies with different operating parameters and plays an important role for RF oscillator design and power coupling. These studies will be useful to decide the design criteria for ICP torches required for different material processing applications.

Punjabi, Sangeeta B. [Electrical Engineering Department, V. J.T.I, Matunga, Mumbai 400019 (India); Department of Physics, University of Mumbai, Kalina, Santacruz(E) 400098 (India); Joshi, N. K. [Faculty of Engineering and technology, MITS, lakshmangarh, (Sikar), Rajasthan 332311 (India); Mangalvedekar, H. A.; Lande, B. K. [Electrical Engineering Department, V. J.T.I, Matunga, Mumbai 400019 (India); Das, A. K. [Laser and Plasma Technology Division, BARC, Mumbai 400085 (India); Kothari, D. C. [Department of Physics, University of Mumbai, Kalina, Santacruz(E) 400098 (India)

2012-01-15T23:59:59.000Z

412

Cold crucible induction melter studies for making glass ceramic waste forms: A feasibility assessment  

Science Conference Proceedings (OSTI)

Glass ceramics are being developed to immobilize fission products, separated from used nuclear fuel by aqueous reprocessing, into a stable waste form suitable for disposal in a geological repository. This work documents the glass ceramic formulation at bench scale and for a scaled melter test performed in a pilot-scale (approximately 1/4 scale) cold crucible induction melter (CCIM). Melt viscosity, electrical conductivity, and crystallization behavior upon cooling were measured on a small set of compositions to select a formulation for melter testing. Property measurements also identified a temperature range for melter operation and cooling profiles necessary to crystallize the targeted phases in the waste form. Bench scale and melter run results successfully demonstrate the processability of the glass ceramic using the CCIM melter technology.

Jarrod Crum; Vince Maio; John McCloy; Clark Scott; Brian Riley; Brad Benefiel; John Vienna; Kip Archibald; Carmen Rodriguez; Veronica Rutledge; Zihua Zhu; Joe Ryan; Matthew Olszta

2014-01-01T23:59:59.000Z

413

Prototyping Energy Efficient Thermo-Magnetic & Induction Hardening for Heat Treat & Net Shape Forming Applications  

SciTech Connect

Within this project, Eaton undertook the task of bringing about significant impact with respect to sustainability. One of the major goals for the Department of Energy is to achieve energy savings with a corresponding reduction in carbon foot print. The use of a coupled induction heat treatment with high magnetic field heat treatment makes possible not only improved performance alloys, but with faster processing times and lower processing energy, as well. With this technology, substitution of lower cost alloys for more exotic alloys became a possibility; microstructure could be tailored for improved magnetic properties or wear resistance or mechanical performance, as needed. A prototype commercial unit has been developed to conduct processing of materials. Testing of this equipment has been conducted and results demonstrate the feasibility for industrial commercialization.

Aquil Ahmad

2012-08-03T23:59:59.000Z

414

THE RESULTS OF TESTING TO EVALUATE CRYSTAL FORMATION AND SETTLING IN THE COLD CRUCIBLE INDUCTION MELTER  

SciTech Connect

The Cold Crucible Induction Melter (CCIM) technology offers the potential to increase waste loading for High Level Waste (HLW) glasses leading to significant improvements in waste throughput rates compared to the reference Joule Heated Melter (JHM). Prior to implementation of a CCIM in a production facility it is necessary to better understand processing constraints associated with the CCIM. The glass liquidus temperature requirement for processing in the CCIM is an open issue. Testing was conducted to evaluate crystal formation and crystal settling during processing in the CCIM to gain insight into the effects on processing. A high aluminum/high iron content glass composition with known crystal formation tendencies was selected for testing. A continuous melter test was conducted for approximately 51 hours. To evaluate crystal formation, glass samples were obtained from pours and from glass receipt canisters where the glass melt had varying residence time in the melter. Additionally, upon conclusion of the testing, glass samples from the bottom of the melter were obtained to assess the degree of crystal settling. Glass samples were characterized in an attempt to determine quantitative fractions of crystals in the glass matrix. Crystal identity and relative composition were determined using a combination of x-ray diffraction (XRD) and scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS). Select samples were also analyzed by digesting the glass and determining the composition using inductively coupled atomic emission spectroscopy (ICP-AES). There was evidence of crystal formation (primarily spinels) in the melt and during cooling of the collected glass. There was evidence of crystal settling in the melt over the duration of the melter campaign.

Marra, J.

2009-06-30T23:59:59.000Z

415

Induction and selection of the most interesting Gene Ontology based multiattribute rules for descriptions of gene groups  

Science Conference Proceedings (OSTI)

A rules induction algorithm dedicated to describe groups of genes with similar expression profiles by means of Gene Ontology terms is discussed in the paper. The presented algorithm takes into consideration information contained in the Gene Ontology ... Keywords: Decision rules, Gene Ontology, Gene groups descriptions, Rough sets, Rule interestingness measures

Marek Sikora; Aleksandra Gruca

2011-01-01T23:59:59.000Z

416

Supply chain trust diagnosis (SCTD) using inductive case-based reasoning ensemble (ICBRE): The case of general competence trust diagnosis  

Science Conference Proceedings (OSTI)

General competence trust among supply chain partners, referring to the trust that a partner holds the general ability of fulfilling contracts, is a critical factor to ensure effective cooperation in a supply chain, especially in the current financial ... Keywords: General competence trust, Inductive case-based reasoning ensemble (ICBRE), Supply chain trust diagnosis (SCTD) service

Hui Li; Jie Sun; Jian Wu; Xian-Jun Wu

2012-08-01T23:59:59.000Z

417

Abstract--The use of doubly fed induction generators (DFIGs) in large wind energy conversion systems (WECS) has  

E-Print Network (OSTI)

1 Abstract--The use of doubly fed induction generators (DFIGs) in large wind energy conversion systems (WECS) has significantly increased during the last few years. The DFIG is interfaced to the AC to the AC grid during disturbances. The sensitivity of DFIGs to external faults has motivated researchers

Pota, Himanshu Roy

418

Analysis of Temporal and Spatial Characteristics on Output of Wind Farms with Doubly Fed Induction Generator Wind Turbines  

Science Conference Proceedings (OSTI)

Due to the large number of wind turbines and covering too large area in a large wind farm, wake effects among wind turbines and wind speed time delays will have a greater impact of wind farms models. Taking wind farms with doubly fed induction generator(DFIG) ... Keywords: wind farm, modeling, temporal and spatial characteristics, DFIG, output characteristics

Shupo Bu, Xunwen Su

2012-12-01T23:59:59.000Z

419

Abstract--In doubly fed induction generator (DFIG) based wind energy conversion systems (WECS), the DFIG is interfaced to the  

E-Print Network (OSTI)

Abstract--In doubly fed induction generator (DFIG) based wind energy conversion systems (WECS), the DFIG is interfaced to the AC network through grid side voltage source converter (GSC) and rotor side-link within permissible limits. The sensitivity of DFIG to external faults has motivated researchers

Pota, Himanshu Roy

420

Improving the low voltage ride through of doubly fed induction generator during intermittent voltage source converter faults  

E-Print Network (OSTI)

on the low voltage ride through (LVRT) capability of the doubly fed induction generator (DFIG) is also) controller to mitigate the effects of these faults is proposed. The DFIG compliance with numerous and compared. Simulation results indicate that these types of faults have a severe impact on the DFIG voltage

Pota, Himanshu Roy

Note: This page contains sample records for the topic "vlf induction method" from the National Library of EnergyBeta (NLEBeta).
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421

Two Families of Sliding Mode Controllers for a Doubly-Fed Induction Generator in an Isolated Generation System  

Science Conference Proceedings (OSTI)

In this paper the authors consider the Sliding Mode Control (SMC) of a Doubly Fed Induction Generator (DFIG), supplying an isolated RL load in a Variable Speed-Constant Frequency (VSCF) generation system. It must be reminded that in electric machines ...

R. Galindo; M. Cotorogea; D. Biel

2006-09-01T23:59:59.000Z

422

Analytical and Experimental Studies on the Hybrid Fault Current Limiter Employing Asymmetric Non-Inductive Coil and Fast Switch  

E-Print Network (OSTI)

This paper deals with design and operating test of a novel hybrid FCL. The FCL system consists of a coil, a fast switch and a resistor for bypassing the fault current. The switch is driven by novel non-inductive coil ...

Yang, Seong Eun

423

ECT-Test-Methods  

Science Conference Proceedings (OSTI)

ECT-Test-Methods. A, B, C, D. 1, NVLAP ECT Test Method Selection List (updated 2013-12-02). 2, 3, Standard Category, Test ...

2013-12-02T23:59:59.000Z

424

Methods to Manufacture Cermets  

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

Manufacture Cermets Methods to Manufacture Cermets There are many methods to manufacture cermets. One option is shown here. DU dioxide and steel powder are mixed, the mixture is...

425

Synchrotron Methods Staff  

Science Conference Proceedings (OSTI)

... Determination Staff; Materials Measurement Science Division Staff Directory; MML Organization. Contact. Synchrotron Methods ...

2012-10-07T23:59:59.000Z

426

Method for measuring recovery of catalytic elements from fuel cells  

Science Conference Proceedings (OSTI)

A method is provided for measuring the concentration of a catalytic clement in a fuel cell powder. The method includes depositing on a porous substrate at least one layer of a powder mixture comprising the fuel cell powder and an internal standard material, ablating a sample of the powder mixture using a laser, and vaporizing the sample using an inductively coupled plasma. A normalized concentration of catalytic element in the sample is determined by quantifying the intensity of a first signal correlated to the amount of catalytic element in the sample, quantifying the intensity of a second signal correlated to the amount of internal standard material in the sample, and using a ratio of the first signal intensity to the second signal intensity to cancel out the effects of sample size.

Shore, Lawrence (Edison, NJ); Matlin, Ramail (Berkeley, NJ)

2011-03-08T23:59:59.000Z

427

Method of correcting eddy current magnetic fields in particle accelerator vacuum chambers  

DOE Patents (OSTI)

A method for correcting magnetic field aberrations produced by eddy currents induced in a particle accelerator vacuum chamber housing is provided wherein correction windings are attached to selected positions on the housing and the windings are energized by transformer action from secondary coils, which coils are inductively coupled to the poles of electro-magnets that are powered to confine the charged particle beam within a desired orbit as the charged particles are accelerated through the vacuum chamber by a particle-driving rf field. The power inductively coupled to the secondary coils varies as a function of variations in the power supplied by the particle-accelerating rf field to a beam of particles accelerated through the vacuum chamber, so the current in the energized correction coils is effective to cancel eddy current flux fields that would otherwise be induced in the vacuum chamber by power variations in the particle beam.

Danby, Gordon T. (Wading River, NY); Jackson, John W. (Shoreham, NY)

1991-01-01T23:59:59.000Z

428

Method of correcting eddy current magnetic fields in particle accelerator vacuum chambers  

DOE Patents (OSTI)

A method for correcting magnetic field aberrations produced by eddy currents induced in a particle accelerator vacuum chamber housing is provided wherein correction windings are attached to selected positions on the housing and the windings are energized by transformer action from secondary coils, which coils are inductively coupled to the poles of electro-magnets that are powered to confine the charged particle beam within a desired orbit as the charged particles are accelerated through the vacuum chamber by a particle-driving rf field. The power inductively coupled to the secondary coils varies as a function of variations in the power supplied by the particle-accelerating rf field to a beam of particles accelerated through the vacuum chamber, so the current in the energized correction coils is effective to cancel eddy current flux fields that would otherwise be induced in the vacuum chamber by power variations (dB/dt) in the particle beam.

Danby, G.T.; Jackson, J.W.

1990-03-19T23:59:59.000Z

429

In situ determination of the static inductance and resistance of a plasma focus capacitor bank  

SciTech Connect

The static (unloaded) electrical parameters of a capacitor bank are of utmost importance for the purpose of modeling the system as a whole when the capacitor bank is discharged into its dynamic electromagnetic load. Using a physical short circuit across the electromagnetic load is usually technically difficult and is unnecessary. The discharge can be operated at the highest pressure permissible in order to minimize current sheet motion, thus simulating zero dynamic load, to enable bank parameters, static inductance L{sub 0}, and resistance r{sub 0} to be obtained using lightly damped sinusoid equations given the bank capacitance C{sub 0}. However, for a plasma focus, even at the highest permissible pressure it is found that there is significant residual motion, so that the assumption of a zero dynamic load introduces unacceptable errors into the determination of the circuit parameters. To overcome this problem, the Lee model code is used to fit the computed current trace to the measured current waveform. Hence the dynamics is incorporated into the solution and the capacitor bank parameters are computed using the Lee model code, and more accurate static bank parameters are obtained.

Saw, S. H. [INTI University College, Nilai 71800 (Malaysia); Institute for Plasma Focus Studies, 32 Oakpark Drive, Chadstone, Victoria 3148 (Australia); Lee, S. [INTI University College, Nilai 71800 (Malaysia); Institute for Plasma Focus Studies, 32 Oakpark Drive, Chadstone, Victoria 3148 (Australia); National Institute of Education, Nanyang Technological University, Singapore 637616 (Singapore); Roy, F.; Chong, P. L.; Vengadeswaran, V.; Sidik, A. S. M.; Leong, Y. W.; Singh, A. [INTI University College, Nilai 71800 (Malaysia)

2010-05-15T23:59:59.000Z

430

Mathematical model of a double-coil inductive transducer for measuring electrical conductivity  

Science Conference Proceedings (OSTI)

A technique for the contactless measurement of the electrical conductivity of conducting materials using a double-coil inductive transducer is presented. A mathematical model of the transducer has been created and it consists of two cylindrical coils and a tested sample in the form of a cylinder coaxial with the coils. A processing function of the transducer is defined as the ratio of voltages between terminals of the measurement coil with and without the test sample. This processing function depends on the conductivity of the test sample, the dimensions of the sample and of both coils of the transducer (the measurement coil and the excitation coil), and the frequency of the current supplied to the excitation coil. An analytical formula for the processing function is derived; analysis of graphs of this function in different formats enables us to evaluate the influence of all the essential parameters of the transducer. This is a necessary step for both transducer optimization and carrying out of the conductivity measurement of the investigated materials. In order to verify the theoretical predictions, experimental investigations have been performed using a computerized data acquisition system. First, an experimental validation of the obtained analytical formula has been completed using an aluminum sample of known conductivity. Then, the conductivity measurements of a sample made of brass have been carried out. The obtained experimental results confirm the high accuracy of the theoretical analysis.

Kusmierz, Jozef [Department of Electrical and Computer Engineering, Kielce University of Technology, Al. 1000-lecia P. P. 7, PL-25-314 Kielce (Poland)

2007-08-15T23:59:59.000Z

431

Position and energy-resolved particle detection using phonon-mediated microwave kinetic inductance detectors  

Science Conference Proceedings (OSTI)

We demonstrate position and energy-resolved phonon-mediated detection of particle interactions in a silicon substrate instrumented with an array of microwave kinetic inductance detectors (MKIDs). The relative magnitude and delay of the signal received in each sensor allow the location of the interaction to be determined with < or approx. 1mm resolution at 30 keV. Using this position information, variations in the detector response with position can be removed, and an energy resolution of {sigma}{sub E} = 0.55 keV at 30 keV was measured. Since MKIDs can be fabricated from a single deposited film and are naturally multiplexed in the frequency domain, this technology can be extended to provide highly pixelized athermal phonon sensors for {approx}1 kg scale detector elements. Such high-resolution, massive particle detectors would be applicable to rare-event searches such as the direct detection of dark matter, neutrinoless double-beta decay, or coherent neutrino-nucleus scattering.

Moore, D. C.; Golwala, S. R.; Cornell, B. [Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, California 91125 (United States); Bumble, B.; Day, P. K.; LeDuc, H. G. [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 (United States); Zmuidzinas, J. [Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, California 91125 (United States); Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 (United States)

2012-06-04T23:59:59.000Z

432

Separation Of Uranium And Plutonium Isotopes For Measurement By Multi Collector Inductively Coupled Plasma Mass Spectroscopy  

Science Conference Proceedings (OSTI)

Uranium (U) and plutonium (Pu) isotopes in coral soils, contaminated by nuclear weapons testing in the northern Marshall Islands, were isolated by ion-exchange chromatography and analyzed by mass spectrometry. The soil samples were spiked with {sup 233}U and {sup 242}Pu tracers, dissolved in minerals acids, and U and Pu isotopes isolated and purified on commercially available ion-exchange columns. The ion-exchange technique employed a TEVA{reg_sign} column coupled to a UTEVA{reg_sign} column. U and Pu isotope fractions were then further isolated using separate elution schemes, and the purified fractions containing U and Pu isotopes analyzed sequentially using multi-collector inductively coupled plasma mass spectrometer (MCICP-MS). High precision measurements of {sup 234}U/{sup 235}U, {sup 238}U/{sup 235}U, {sup 236}U/{sup 235}U, and {sup 240}Pu/{sup 239}Pu in soil samples were attained using the described methodology and instrumentation, and provide a basis for conducting more detailed assessments of the behavior and transfer of uranium and plutonium in the environment.

Martinelli, R E; Hamilton, T F; Williams, R W; Kehl, S R

2009-03-29T23:59:59.000Z

433

The Production of Advanced Glass Ceramic HLW Forms using Cold Crucible Induction Melter  

SciTech Connect

Cold Crucible Induction Melters (CCIMs) will favorably change how High-Level radioactive Waste (from nuclear fuel recovery) is treated in the 21st century. Unlike the existing Joule-Heated Melters (JHMs) currently in operation for the glass-based immobilization of High-Level Waste (HLW), CCIMs offer unique material features that will increase melt temperatures, increase throughput, increase mixing, increase loading in the waste form, lower melter foot prints, eliminate melter corrosion and lower costs. These features not only enhance the technology for producing HLW forms, but also provide advantageous attributes to the waste form by allowing more durable alternatives to glass. This paper discusses advantageous features of the CCIM, with emphasis on features that overcome the historical issues with the JHMs presently utilized, as well as the benefits of glass ceramic waste forms over borosilicate glass waste forms. These advantages are then validated based on recent INL testing to demonstrate a first-of-a-kind formulation of a non-radioactive ceramic-based waste form utilizing a CCIM.

Veronica J Rutledge; Vince Maio

2013-10-01T23:59:59.000Z

434

An update on the Array Induction Imager Tool (AIT) in the Gulf of Thailand  

SciTech Connect

The Array Induction Imager Tool (AIT) arrived in the Gulf of Thailand in June 1992, and has since performed almost 10 jobs in a large variety of conditions. The equipment has proved very reliable, and the quality of the data has been excellent. The primary purpose of running the AIT in the Gulf of Thailand wells has been to provide accurate resistivity data to minimize the error when establishing hydrocarbon reserves. Indeed, the tool is bringing about a revolution of information evaluation in thinly bedded or deeply invaded zones, where oil companies are seeing significant increases in reserves based purely on the changeover to AIT data. Important though this is, the benefits of the service are not just limited to improving the Rt value. Images of the radial resistivity profile are also giving a unique insight into the three dimensional geology surrounding the well bore, and the dynamics of filtrate movement through the more permeable sections. In every case where it has been run, the AIT provided the user with a clearer (and often more profitable) understanding of the reservoir than that obtained with conventional resistivity measurements.

Berger, P. (Schlumberger O.S.A., Bangkok (Thailand)); Ferment, D. (Total Thailand Exploration and Production, Bangkok (Thailand))

1994-07-01T23:59:59.000Z

435

MODIFIED ZONE METHOD CALCULATOR  

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

Zone Method is recommended for R-value calculations in steel stud walls by the 1997 ASHRAE Handbook of Fundamentals ASHRAE 1997. The Modified Zone Method is similar to the...

436

A Comparison of Three Voting Methods for Bagging with the MLEM2 Algorithm  

Science Conference Proceedings (OSTI)

This paper presents results of experiments on some data sets using bagging on the MLEM2 rule induction algorithm. Three different methods of ensemble voting, based on support (a non-democratic voting in which ensembles vote with their strengths), strength only (an ensemble with the largest strength decides to which concept a case belongs) and democratic voting (each ensemble has at most one vote) were used. Our conclusions are that though in most cases democratic voting was the best, it is not significantly better than voting based on support. The strength voting was the worst voting method.

Clinton Cohagan; Jerzy W. Grzymala-Busse; Zdzislaw S. Hippe

2010-03-17T23:59:59.000Z

437

Doubly Fed Induction Generator in an Offshore Wind Power Plant Operated at Rated V/Hz: Preprint  

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

Doubly Fed Induction Generator Doubly Fed Induction Generator in an Offshore Wind Power Plant Operated at Rated V/Hz Preprint Eduard Muljadi, Mohit Singh, and Vahan Gevorgian To be presented at the IEEE Energy Conversion Congress and Exhibition Raleigh, North Carolina September 15-20, 2012 Conference Paper NREL/CP-5500-55573 June 2012 NOTICE The submitted manuscript has been offered by an employee of the Alliance for Sustainable Energy, LLC (Alliance), a contractor of the US Government under Contract No. DE-AC36-08GO28308. Accordingly, the US Government and Alliance retain a nonexclusive royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for US Government purposes. This report was prepared as an account of work sponsored by an agency of the United States government.

438

Frequency-dependent hydrodynamic inductance and the determination of the thermal and quantum noise of a superfluid gyroscope  

SciTech Connect

We reexamine mass flow in a superfluid gyroscope containing a superfluid Josephson weak link. We introduce a frequency-dependent hydrodynamic inductance to account for an oscillatory flow of the normal fluid component in the sensing loop. With this hydrodynamic inductance, we derive the thermal phase noise, and hence the thermal rotational noise of the gyroscope. We examine the thermodynamic stability of the system based on an analysis of the free energy. We derive a quantum phase noise, which is analogous to the zero-point motion of a simple harmonic oscillator. The configuration of the studied gyroscope is analogous to a conventional superconducting RF SQUID. We show that the gyroscope has very low intrinsic noise (1.9x10{sup -13} rad s{sup -1}/{radical}(Hz)), and it can potentially be applied to study general relativity, Earth science, and to improve global positioning systems (GPS)

Chui, Talso; Penanen, Konstantin [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 (United States)

2005-04-01T23:59:59.000Z

439

Cooperative method development  

Science Conference Proceedings (OSTI)

The development of methods tools and process improvements is best to be based on the understanding of the development practice to be supported. Qualitative research has been proposed as a method for understanding the social and cooperative aspects of ... Keywords: Cooperative method development, D.2.9 [Software]: Software Engineering --- Management, Empirical research, Human factors, Research methodology, Software engineering

Yvonne Dittrich; Kari Rönkkö; Jeanette Eriksson; Christina Hansson; Olle Lindeberg

2008-06-01T23:59:59.000Z

440

Innovative Carbon Dioxide Sequestration from Flue Gas Using an In-Duct Scrubber Coupled with Alkaline Clay Mineralization  

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

Innovative Carbon Dioxide Sequestration Innovative Carbon Dioxide Sequestration from Flue Gas Using an In-Duct Scrubber Coupled with Alkaline Clay Mineralization Background The United States Department of Energy (DOE) is leading an effort to find novel approaches to reduce carbon dioxide (CO 2 ) emissions from industrial sources. The Industrial Carbon Capture and Sequestration (ICCS) program is funded by the American Recovery and Reinvestment Act (ARRA) to encourage development of processes that

Note: This page contains sample records for the topic "vlf induction method" 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

Improving the low voltage ride through of doubly fed induction generator during intermittent voltage source converter faults  

Science Conference Proceedings (OSTI)

The impact of different voltage source converter (VSC) faults on the low voltage ride through (LVRT) capability of the doubly fed induction generator (DFIG) is also investigated. Faults such as fire-through of the VSC switches and short circuit across the DC-link capacitor are considered in this paper. The impact of internal VSC faults when they occur within the grid side converter (GSC)

2013-01-01T23:59:59.000Z

442

Vitrification of high level nuclear waste inside ambient temperature disposal containers using inductive heating: The SMILE system  

Science Conference Proceedings (OSTI)

A new approach, termed SMILE (Small Module Inductively Loaded Energy), for the vitrification of high level nuclear wastes (HLW) is described. Present vitrification systems liquefy the HLW solids and associated frit material in large high temperature melters. The molten mix is then poured into small ({approximately}1 m{sup 3}) disposal canisters, where it solidifies and cools. SMILE eliminates the separate, large high temperature melter. Instead, the BLW solids and frit melt inside the final disposal containers, using inductive heating. The contents then solidify and cool in place. The SMILE modules and the inductive heating process are designed so that the outer stainless can of the module remains at near ambient temperature during the process cycle. Module dimensions are similar to those of present disposal containers. The can is thermally insulated from the high temperature inner container by a thin layer of refractory alumina firebricks. The inner container is a graphite crucible lined with a dense alumina refractory that holds the HLW and fiit materials. After the SMILE module is loaded with a slurry of HLW and frit solids, an external multi-turn coil is energized with 30-cycle AC current. The enclosing external coil is the primary of a power transformer, with the graphite crucible acting as a single turn ``secondary.`` The induced current in the ``secondary`` heats the graphite, which in turn heats the HLW and frit materials. The first stage of the heating process is carried out at an intermediate temperature to drive off remnant liquid water and water of hydration, which takes about 1 day. The small fill/vent tube to the module is then sealed off and the interior temperature raised to the vitrification range, i.e., {approximately}1200C. Liquefaction is complete after approximately 1 day. The inductive heating then ceases and the module slowly loses heat to the environment, allowing the molten material to solidify and cool down to ambient temperature.

Powell, J.; Reich, M.; Barletta, R.

1996-03-01T23:59:59.000Z

443

Iris Project: Information Skills Provision: Mapping the information skills of Cambridge undergraduates and induction / training provision across the University  

E-Print Network (OSTI)

with information seeking, and provides a distinctly different profile to that registered by postgraduate students. High Participation in Introduction Sessions The take-up of basic library inductions and tours by undergraduate students was high. This may... -week terms create an intensive study load for undergraduate students, with essays, questions or other assignments often due in on a weekly basis and many students did not feel they had sufficient time to do an independent literature search. As long as we...

Edwards-Waller, E

444

Autogenous regulation and kinetics of induction of Pseudomonas aeruginosa recA transcription as analyzed with operon fusions  

SciTech Connect

A promoterless chloramphenicol acetyltransferase gene (cat) was used to construct recA-cat operon fusions to quantitatively examine the transcriptional regulation of the Pseudomonas aeruginosa recA gene in P. aeruginosa PAO. Wild-type P. aeruginosa containing the recA8-cat fusion was treated with methyl methanesulfonate (MMS) and showed immediate induction of chloramphenicol acetyltransferase (CAT) specific activity, whereas a recA::Tn501 mutant of P. aeruginosa containing recA8-cat showed no induction with MMS. This indicated that a functional copy of recA was required for derepression of recA transcription and that P. aeruginosa recA protein was a positive regulatory factor promoting its own expression. Compared with that in the wild type, the uninduced level of CAT in recA8-cat-containing cells was reduced by approximately one-half in the recA::Tn501 mutant, indicating that recA+-dependent spontaneous induction contributes to the uninduced levels of recA expression in P. aeruginosa. MMS (0.012%) caused recA-directed CAT synthesis to increase almost immediately, with maximum CAT activity, fourfold higher than uninduced levels, attained at 60 min postinduction. The kinetics of recA8-cat fusion activity were shown to be directly related to the MMS doses used. Another fusion called recAa1-cat, where cat was located between the two transcriptional terminators of the P. aeruginosa recA gene, also showed dose-dependent induction by MMS, but the CAT activity from recAa1-cat was only one-half of that obtained with recA8-cat under the same conditions. Treatment of recA+ P. aeruginosa containing recA8-cat with UV irradiation produced an immediate effect on recA8-cat transcription and showed little UV dose dependency at doses of 5 J/m2 or greater.

Horn, J.M.; Ohman, D.E.

1988-10-01T23:59:59.000Z

445

Etching characteristics and mechanisms of SiC thin films in inductively-coupled HBr-Ar, N{sub 2}, O{sub 2} plasmas  

Science Conference Proceedings (OSTI)

Etch characteristics and mechanisms of SiC thin films in HBr-Ar, HBr-N{sub 2}, and HBr-O{sub 2} inductively-coupled plasmas were studied using a combination of experimental and modeling methods. The etch rates of SiC thin films were measured as functions of the additive gas fraction in the range of 0-100% for Ar, N{sub 2}, and O{sub 2} at a fixed gas pressure (6 mTorr), input power (700 W), bias power (200 W), and total gas flow rate (40 sccm). The plasma chemistry was analyzed using Langmuir probe diagnostics and a global (zero-dimensional) plasma model. The good agreement between the behaviors of the SiC etch rate and the H atom flux could suggest that a chemical etch pathway is rather controlled by the gasification of carbon through the CH{sub x} or CH{sub x}Br{sub y} compounds.

Efremov, Alexander; Kang, Sungchil; Kwon, Kwang-Ho; Seok Choi, Won [Department of Electronic Devices and Materials Technology, State University of Chemistry and Technology, 7 F. Engels St., 153000 Ivanovo (Russian Federation); Department of Control and Instrumentation Engineering, Korea University, Chungnam 339-700 (Korea, Republic of); Department of Electrical Engineering, Hanbat National University, Daejeon 305-719 (Korea, Republic of)

2011-11-15T23:59:59.000Z

446

A three-phase multi-legged transformer model in ATP using the directly-formed inverse inductance matrix  

Science Conference Proceedings (OSTI)

A new transformer model based on core topology is developed. The model simulates the transformer as a set of coupled inductances. Winding flux linkages are chosen as state variables and currents are computed from the flux linkages using the directly-formed inverse inductance matrix, the {Gamma}-matrix. Due to the strong magnetic coupling among the windings, the inductance matrix of a transformer is ill-conditioned. Directly forming the {Gamma}-matrix will not only speed up the computation but also make it more stable. Transformer core saturation is represented by its anhysteretic magnetization curve. Eddy current and hysteresis losses of the core, and stray losses of the transformer are accounted for by a resistive load on the secondary. Winding capacitances are lumped to the terminals, the model is thus accurate up to 5 kHz. A supporting routine is written to generate {lambda}-i curve data for each segment of the core and the other input data for EMTP. The model has been incorporated into the Alternative Transients Program (ATP), the BPA EMTP, for evaluation, and has passed the benchmark test of the GPU line energization test of 1973.

Chen, X. [Seattle Univ., WA (United States). Dept. of Electrical Engineering

1996-07-01T23:59:59.000Z

447

Design and Test of DC Voltage Link Conversion System and Brushless Doubly-Fed Induction Generator for Variable-Speed Wind Energy Applications: August 1999--May 2003  

SciTech Connect

This report describes four low-cost alternative power converters for processing the power developed by a doubly fed wound-rotor induction generator for wind energy conversion systems.

Lipo, T.A.; Panda, D.; Zarko, D.

2005-11-01T23:59:59.000Z

448

Unbalanced-grid-fault ride-through control for a doubly fed induction generator wind turbine with series grid-side converter  

Science Conference Proceedings (OSTI)

The grid codes now require doubly fed induction generator (DFIG) wind turbines having the "low voltage ride-through (LVRT)" capability. However, a traditional DFIG with a partially rated back-to-back converter has inherent difficulties to ride through ... Keywords: doubly fed induction generator (DFIG), low voltage ride-through (LVRT), series grid-side converter (SGSC), unbalanced grid fault, voltage dips, voltage sags, wind power generation, wind turbine

Yong Liao; Hui Li; Jun Yao

2011-02-01T23:59:59.000Z

449

Investigation of magnetic-pole-enhanced inductively coupled nitrogen-argon plasmas  

SciTech Connect

This article presented the features of the mixed mode and H mode in magnetic pole enhanced, inductively coupled Ar-N{sub 2} plasmas using RF-compensated Langmuir probe measurements. To fully characterize plasma parameters and electron energy probability functions (EEPFs), the gas pressure and argon content were varied. It was observed that with increasing the nitrogen content and gas pressure, the critical RF power to sustain H mode increases; this increase was more prominent for pure nitrogen discharge at higher pressure. The electron number density (n{sub e}) shows increasing trend with increasing RF power, while at higher gas pressures, the electron number density decreases at fixed RF power. Mostly, the EEPFs show a Maxwellian distribution even at low RF power (for higher argon content in the discharge) and at moderate RF power (for higher or pure nitrogen content in the discharge) for pressures of 15-60 mTorr. With increasing the nitrogen content in the mixture, the low energy part of the EEPF is more Druyvesteyn with a distorted high energy tail at low RF power. At fixed RF power, the slope of EEPF changes sharply with increasing pressure. It was observed that in hybrid mode, the EEPF at higher gas pressure (75 mTorr) in a pure nitrogen discharge shows a flat hole near the average electron energy of 3 eV and changes to Maxwellian distribution in H mode. The skin depth versus RF power shows that the skin depth is smaller than the critical dimension of the chamber, regardless of the gas type and the gas pressure.

Jan, F.; Zakaullah, M. [Department of Physics, Quaid-i-Azam University Islamabad, Islamabad 45320 (Pakistan); Khan, A. W.; Saeed, A. [National Centre for Physics, Quaid-i-Azam University Campus Islamabad, Islamabad 45320 (Pakistan)

2012-09-15T23:59:59.000Z

450

Citrus limonoids: seasonal changes and their potential in glutathione S-transferase induction  

E-Print Network (OSTI)

Seasonal changes of citrus limonids in 'Rio Red' grapefruit were investigated using reverse phase high performance liquid chromatography (HPLC). Several citrus limonoids, limonoid mixtures and a flavonone were evaluated for their ability to induce glutathione (GSH) and glutathione S-transferase (GST) in laboratory animals. In the flesh, segment membrane and albedo part of 'Rio Red' grapefruit, limonoate A-ring lactone (LARL) decreased, while limonin 17-b-D-glucopyranoside (LG) increased during late stages of fruit growth and maturation, suggesting that LARL was converted to LG as fruit maturation continued. Since the sudden decrease of LARL and the first appearance of LG did not take place simultaneously, there might be translocations of limonoids in forms other than nomilin among different tissues of 'Rio Red' grapefruit. In the seeds, both LARL and LG increased steadily throughout the experiment. Studies conducted on the effect of citrus limonoids on GSH level and GST activity showed that certain citrus limonoids had potential to induce both GSH level and GST activity. Limonoid aglycones were more effective than their glucosides as enzyme inducers. Nomilin and aglycone mixtures were the most potent inducers. The GST inducing activity of citrus limonoids appears to be structure-related. The opened D ring and/or the addition of a glucose molecule of the limonoid glucosides may be responsible for reduced GST-inducing acivity. An intact A ring of citrus limonoids seemed to be necessary for the enzyme induction. Further research is needed to explore the absorption, distribution and metabolism of citrus limonoids in animal systems.

Li, Jiaxing

2002-01-01T23:59:59.000Z

451

Method of degrading trinitrotoluene  

DOE Patents (OSTI)

A method of eluting trinitrotoluene (TNT) from soil using a dispersant from bacterial intra-amoebic isolate 1s, ATCC 75229.

Tyndall, Richard L. (Clinton, TN); Vass, Arpad (Oak Ridge, TN)

1996-01-01T23:59:59.000Z

452

Very Low Frequency (VLF) Hipot Testing of Rotating Machine Stator Winding Insulation  

Science Conference Proceedings (OSTI)

High-potential (hipot) tests are performed to determine whether winding insulation in rotating electrical machinery has a minimum level of electrical strength to successfully survive electrical stresses in normal service for the expected life of the machine. In recent years, the Electric Power Research Institute (EPRI) has been engaged in helping to clarify industry practices and investigate questions about specific aspects of hipot testing. One topic of interest to the industry is the use of very-low-fr...

2011-12-23T23:59:59.000Z

453

Induction of CYP 1A enzyme activity and genotoxicity from ternary mixtures of produced water relvant compounds, evaluated by in vitro methods.  

E-Print Network (OSTI)

??Produced water is a complex mixture discharged to sea in high volumes containing compounds at low concentrations. Compounds in mixtures can modify each other?s expected… (more)

Størdal, Ingvild Fladvad

2011-01-01T23:59:59.000Z

454

Journal of Crystal Growth 250 (2003) 499515 Induction time in crystallization of gas hydrates  

E-Print Network (OSTI)

-mail addresses: pawel@ices.utexas.edu, pjm@agh.edu.pl (P.J. Matuszyk). Comput. Methods Appl. Mech. Engrg. 213

Firoozabadi, Abbas

455

Purification of solar-grade silicon by induction melting in cold crucible  

Science Conference Proceedings (OSTI)

Abstract Scope, New method for purification of SoG-Si (solar-grade silicon) is ... suitable for using in directional solidification process (DS) for PV application.

456

Online monitoring of turn insulation deterioration in mains-fed induction machines using online surge testing .  

E-Print Network (OSTI)

??The development of an online method for the early detection of a stator turn insulation deterioration is the objective of the research at hand. A… (more)

Grubic, Stefan

2011-01-01T23:59:59.000Z

457

Methods for data classification  

DOE Patents (OSTI)

The present invention provides methods for classifying data and uncovering and correcting annotation errors. In particular, the present invention provides a self-organizing, self-correcting algorithm for use in classifying data. Additionally, the present invention provides a method for classifying biological taxa.

Garrity, George (Okemos, MI); Lilburn, Timothy G. (Front Royal, VA)

2011-10-11T23:59:59.000Z

458

Water treatment method  

DOE Patents (OSTI)

A method for reducing the concentration of any undesirable metals dissolved in contaminated water, such as waste water. The method involves uniformly reacting the contaminated water with an excess amount of solid particulate calcium sulfite to insolubilize the undesirable metal ions, followed by removal thereof and of the unreacted calcium sulfite.

Martin, Frank S. (Farmersville, OH); Silver, Gary L. (Centerville, OH)

1991-04-30T23:59:59.000Z

459

Water treatment method  

DOE Patents (OSTI)

A method for reducing the concentration of many undesirable metals dissolved in contaminated water, such as waste water. The method involves uniformly reacting the contaminated water with an excess amount of solid particulate calcium sulfite to insolubilize the undesirable metal ions, followed by removal thereof and of the unreacted calcium sulfite. 1 tab.

Martin, F.S.; Silver, G.L.

1990-02-02T23:59:59.000Z

460

Water treatment method  

DOE Patents (OSTI)

A method is described for reducing the concentration of any undesirable metals dissolved in contaminated water, such as waste water. The method involves uniformly reacting the contaminated water with an excess amount of solid particulate calcium sulfite to insolubilize the undesirable metal ions, followed by removal thereof and of the unreacted calcium sulfite.

Martin, F.S.; Silver, G.L.

1991-04-30T23:59:59.000Z

Note: This page contains sample records for the topic "vlf induction method" from the National Library of EnergyBeta (NLEBeta).
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to obtain the most current and comprehensive results.


461

Final report for the Pennsylvania State University Communications and Space Sciences Laboratory. Final report, 15 June 1987-8 August 1989  

SciTech Connect

The broad research objective of this program has been to investigate unique concepts for generating ULF, ELF, and VLF using the ionosphere as the wireless antenna. The wireless Antenna or HF demodulation experiment was demonstrated in 1980 using the Arecibo observatory's heating facility. Modulation of the dynamo current system at that latitude was the major source for the wireless antenna. Some of the major experimental accomplishments are: Excellent quality of generated ELF and VLF signals. Determination of D-region electron density profiles at high latitudes for large sunspot numbers. Slow beam steering to examine the structure of the electrojet current system mapped down into the D-region. Determination of electrojet activity from ELF/VLF polarization characteristics. Created multiple VLF ionospheric sources (two-element VLF arrays). Fast beam steering - the painting technique; a potential method of increasing ELF power. Short range field measurements in Alaska with the Penn State Mobile Van. Demonstrated the stability of the current system to support bi-phase PSK and Quad-phase PSK to increase data rates.

Ferraro, A.J.; Wong, A.W.

1989-01-01T23:59:59.000Z

462

Effective temporal data classification by integrating sequential pattern mining and probabilistic induction  

Science Conference Proceedings (OSTI)

Data classification is an important topic in the field of data mining due to its wide applications. A number of related methods have been proposed based on the well-known learning models such as decision tree or neural network. Although data classification ... Keywords: Classification, Data mining, Scoring method, Sequential pattern, Temporal data

Vincent S. Tseng; Chao-Hui Lee

2009-07-01T23:59:59.000Z

463

Catalytic reforming methods  

DOE Patents (OSTI)

A catalytic reforming method is disclosed herein. The method includes sequentially supplying a plurality of feedstocks of variable compositions to a reformer. The method further includes adding a respective predetermined co-reactant to each of the plurality of feedstocks to obtain a substantially constant output from the reformer for the plurality of feedstocks. The respective predetermined co-reactant is based on a C/H/O atomic composition for a respective one of the plurality of feedstocks and a predetermined C/H/O atomic composition for the substantially constant output.

Tadd, Andrew R; Schwank, Johannes

2013-05-14T23:59:59.000Z

464

Method for inducing hypothermia  

DOE Patents (OSTI)

Systems for phase-change particulate slurry cooling equipment and methods to induce hypothermia in a patient through internal and external cooling are provided. Subcutaneous, intravascular, intraperitoneal, gastrointestinal, and lung methods of cooling are carried out using saline ice slurries or other phase-change slurries compatible with human tissue. Perfluorocarbon slurries or other slurry types compatible with human tissue are used for pulmonary cooling. And traditional external cooling methods are improved by utilizing phase-change slurry materials in cooling caps and torso blankets.

Becker, Lance B. (Chicago, IL); Hoek, Terry Vanden (Chicago, IL); Kasza, Kenneth E. (Palos Park, IL)

2003-04-15T23:59:59.000Z

465

Method for inducing hypothermia  

DOE Patents (OSTI)

Systems for phase-change particulate slurry cooling equipment and methods to induce hypothermia in a patient through internal and external cooling are provided. Subcutaneous, intravascular, intraperitoneal, gastrointestinal, and lung methods of cooling are carried out using saline ice slurries or other phase-change slurries compatible with human tissue. Perfluorocarbon slurries or other slurry types compatible with human tissue are used for pulmonary cooling. And traditional external cooling methods are improved by utilizing phase-change slurry materials in cooling caps and torso blankets.

Becker, Lance B. (Chicago, IL); Hoek, Terry Vanden (Chicago, IL); Kasza, Kenneth E. (Palos Park, IL)

2008-09-09T23:59:59.000Z

466

Fire PRA Methods Enhancements  

Science Conference Proceedings (OSTI)

This report describes research on fire probabilistic risk assessment PRA methods. The fire PRA methods presented in this report provide additions, clarifications, and refinements to the methods proposed in 2005 by the Electric Power Research Institute EPRI and the U.S. Nuclear Regulatory Commission NRC in EPRI/NRC-RES Fire PRA Methodology for Nuclear Power Facilities EPRI 1011989/NUREG/CR-6850. The purpose of the current report is to provide the most current, state-of-the-art information in order to supp...

2008-12-23T23:59:59.000Z

467

Method for making organyltriorganooxysilanes  

DOE Patents (OSTI)

A method for the preparation of organyltriorganooxysilanes containing at least one silicon-carbon bond is provided comprising reacting at least one tetraorganooxysilane with an activated carbon and at least one base.

Schattenmann, Florian Johannes (Ballston Lake, NY)

2002-01-01T23:59:59.000Z

468

PARTICLE SEPARATION METHOD  

DOE Patents (OSTI)

An improved method of sedimentation is described. A series of spaced surfaces of powdered material positioned normal to the centrifugal field concentrates the larger, slower moving molecules of a liquid and hastens sedimentation. (AEC)

Anderson, N.G.

1963-01-29T23:59:59.000Z

469

Formal computations and methods  

Science Conference Proceedings (OSTI)

We present formal verification methods and procedures for finding bounds of linear programs and proving nonlinear inequalities. An efficient implementation of formal arithmetic computations is also described. Our work is an integral part of the Flyspeck ...

Alexey Solovyev / Thomas C. Hales

2012-01-01T23:59:59.000Z

470

Method for synthesizing boracities  

DOE Patents (OSTI)

A method for producing boracites is disclosed in which a solution of divalent metal acetate, boric acid, and halogen acid is evaporated to dryness and the resulting solid is heated in an inert atmosphere under pressure.

Wolf, Gary A. (Kennewick, WA)

1982-01-01T23:59:59.000Z

471

Subcell Remapping Method  

National Nuclear Security Administration (NNSA)

Subcell Subcell Remapping Method on Staggered Polygonal Grids for Arbitrary Lagrangian-Eulerian Methods Mikhail Shashkov T-7, LANL, shashkov@lanl.gov webpage: cnls.lanl.gov/∼ shashkov Raphael Loubere, T-7, LANL This work was performed under the auspices of the US Department of Energy at Los Alamos National Laboratory, under contract W-7405-ENG-36. The authors acknowledge the partial support of the ASC-ASCI Program at LANL and MICS DOE/ASCR Program in the Applied Mathematical Sciences 1 Outline * Arbitrary Lagrangian-Eulerian (ALE) Methods * Lagrangian Stage - Discretization, Subcell forces, Artificial Viscosity * Rezone Stage - Reference Jacobian Strategy, Untangling * Staggered Remap - Statement, Requirements and Main Stages - Gathering Stage - Subcell Remapping Stage - Scattering Stage - Numerical Examples * References 2 Arbitrary Lagrangian-Eulerian (ALE) Methods

472

Method of treating depression  

DOE Patents (OSTI)

Methods for treatment of depression-related mood disorders in mammals, particularly humans are disclosed. The methods of the invention include administration of compounds capable of enhancing glutamate transporter activity in the brain of mammals suffering from depression. ATP-sensitive K.sup.+ channel openers and .beta.-lactam antibiotics are used to enhance glutamate transport and to treat depression-related mood disorders and depressive symptoms.

Henn, Fritz (East Patchogue, NY)

2012-01-24T23:59:59.000Z

473

Method of treating depression  

DOE Patents (OSTI)

Methods for treatment of depression-related mood disorders in mammals, particularly humans are disclosed. The methods of the invention include administration of compounds capable of enhancing glutamate transporter activity in the brain of mammals suffering from depression. ATP-sensitive K.sup.+ channel openers and .beta.-lactam antibiotics are used to enhance glutamate transport and to treat depression-related mood disorders and depressive symptoms.

Henn, Fritz

2013-04-09T23:59:59.000Z

474

IRRADIATION METHOD AND APPARATUS  

DOE Patents (OSTI)

A method and apparatus are described for changing fuel bodies into a process tube of a reactor. According to this method fresh fuel elements are introduced into one end of the tube forcing used fuel elements out the other end. When sufficient fuel has been discharged, a reel and tape arrangement is employed to pull the column of bodies back into the center of the tube. Due provision is made for providing shielding in the tube. (AEC)

Cabell, C.P.

1962-12-18T23:59:59.000Z

475

Method of saccharifying cellulose  

DOE Patents (OSTI)

A method is disclosed of saccharifying cellulose by incubation with the cellulase of Clostridium thermocellum in a broth containing an efficacious amount of thiol reducing agent. Other incubation parameters which may be advantageously controlled to stimulate saccharification include the concentration of alkaline earth salts, pH, temperature, and duration. By the method of the invention, even native crystalline cellulose such as that found in cotton may be completely saccharified.

Johnson, E.A.; Demain, A.L.; Madia, A.

1983-05-13T23:59:59.000Z

476

Development and anlysis of fast, approximate 3D Algorithms for interpretation of multi-component induction logging data  

DOE Green Energy (OSTI)

This report addresses the effects of electrical anisotropy on the 3D inversion of single-well induction logging data when anisotropy is not considered. Of concern are possible artifacts that may lead to an incorrect interpretation of the formation about the borehole. Comparison is made of 3D isotropic inversion on a suite of model data, with and without anisotropy, consisting of an infinite layer and layer terminated at the borehole. In both cases, the layer dip (or well deviation) is varied. Inversion of the anisotropic data result in an overestimate of the layer conductivity, and the lateral extent of the layer about the borehole.

David L. Alumbaugh

2006-07-03T23:59:59.000Z

477

The analysis of an ungrounded Wye-Delta transformer bank serving an induction motor and single-phase lighting loads  

SciTech Connect

This paper documents the detailed analysis of the three-phase ungrounded wye-delta transformer bank serving a combination three-phase induction motor and single-phase lighting load. A 3 x 3 transfer function matrix is developed that makes it possible to determine the load line-to-line voltages with a knowledge of the primary voltages of the transformer bank. Included in the transfer function matrix are the transformer impedances, unsymmetrical secondary impedance matrix, and the impedances of the motor and single-phase lighting load.

Kersting, W.H.; Rathbun, J.S.

2000-02-01T23:59:59.000Z

478

Design and demonstration of heat pipe cooling for NASP and evaluation of heating methods at high heating rates  

SciTech Connect

An evaluation of two heating methods for demonstration of NASP leading edge heat pipe technology was conducted. The heating methods were and rf induction heated plasma jet and direct rf induction. Tests were conducted to determine coupling from the argon plasma jet on a surface physically similar to a heat pipe. A molybdenum tipped calorimeter was fabricated and installed in an rf induction heated plasma jet for the test. The calorimetric measurements indicated a maximum power coupling of approximately 500 W/cm{sup 2} with the rf plasma jet. The effect of change in gas composition on the heating rate was investigated using helium. An alternative to the plasma heating of a heat pipe tip, an rf concentrator was evaluated for coupling to the hemispherical tip of a heat pipe. A refractory metal heat pipe was designed, fabricated, and tested for the evaluation. The heat pipe was designed for operation at 1400 to 1900 K with power input to 1000 W/cm{sup 2} over a hemispherical nose tip. Power input of 800 W/cm{sup 2} was demonstrated using the rf concentrator. 2 refs., 13 figs.

Merrigan, M.A.; Sena, J.T.

1989-01-01T23:59:59.000Z

479