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1
THERMOLUMINESCENCE INDUCED BY AC ELECTRIC ...
1970-05-01

... Title : THERMOLUMINESCENCE INDUCED BY AC ELECTRIC FIELD IN ELECTROLUMINESCENT ZnS(Cu) SINGLE CRYSTALS,. ...

DTIC Science & Technology

2
STUDY OF ELECTRICAL BREAKDOWN CONDITIONS IN ...
1962-01-30

... CONDITIONS IN THE AERODYNAMIC FLOW FIELD OF A HYPERSONIC VEHICLE. ... phenomena in gases subject to ac electric fields are analyzed. ...

DTIC Science & Technology

3
RECONSTRUCTING ELECTRICAL CONDUCTIVITY ...

... SAMPLE AND AN AC MAGNETIC FIELD ... FREQUENCY, WHERE IMPEDANCE HERE IS ... THE RECONSTRUCTION METHOD ARE PRESENTED ...

DTIC Science & Technology

4
Proceedings of the Symposium on EHV AC Power Transmission.
1975-01-01

This conference examined the following aspects of 750 to 1500 kV ac power transmission systems and equipment: trends in systems and equipment development; electric field measurements and the consideration of electric fields in EHV and UHV ac system design...

National Technical Information Service (NTIS)

5
Ice Treeing under DC and AC Electric Fields at Different ...
1983-06-01

... (Author). Descriptors : *Ice, *Ice formation, *Electric conductors, *Cold weather tests, Transmission lines, Electric fields, Test equipment, Aluminum ...

DTIC Science & Technology

6
VEFI Measurement List

High accuracy absolute fields utilize advanced processing techniques. ... scale instabilities. AC Electric Field. ELF Waveforms ...

NASA Website

7
Quantum Theory of AC Magnetoresistance.
1966-01-01

The quantum transport theory of electronic conduction in the presence of a strong magnetic field is extended to the case of an applied alternating transverse electric field. The ac magnetoconductivity is calculated for a long-wavelength electric field, ta...

National Technical Information Service (NTIS)

8
Application of a flow generated by IR laser and AC electric field in micropumping and micromixing
2008-12-01

In this paper, it is described that measurement of fluid flow generated by simultaneous operation of an infrared (IR) laser and AC electric field in a microfabricated channel. When an IR laser (1026 nm) was focused under an intense AC electric field, a circulating flow was ...

NASA Astrophysics Data System (ADS)

9
Effect of AC electric field on the whistler mode instability in the magnetosphere
1993-06-01

This paper is a modeling study of whistler wave propagation in an infinite bi-Maxwellian magnetoplasma in the presence of an ac electric field. The authors derive the dispersion relations for the instability using a method of characteristic solutions. They determine the growth rate of the instability. They find that the ...

Energy Citations Database

10
Critical Currents and AC Losses in Model YBCO Structures
2002-05-01

... Title : Critical Currents and AC Losses in Model YBCO ... HALL EFFECT, ELECTRIC FIELDS, ALTERNATING CURRENT, OXIDES, COPPER ...

DTIC Science & Technology

11
THERMAL DISTRIBUTION AND CONDUCTIVITY OF ...

... Pagination or Media Count : 47. ... in a DC electric field, or ratio of odd harmonics in an AC electric field) of a weakly ionized gas (argon) are computed ...

DTIC Science & Technology

12
AC Electric Fields Captured in VEFI Burst Memory

with lightning sferics enhanced within density depletions. AC Electric Fields. Captured in VEFI. Burst Memory. + 3.5 mV/m. 3.5 mV/m.

NASA Website

13
Observations of intense velocity shear and associated electrostatic waves near an auroral arc
1977-01-01

Simultaneous measurements of energetic particles and ac electric fields made by the javelin sounding

NASA Technical Reports Server (NTRS)

14
Observation of Unidirectional Current Rectification and AC-to ...
2008-12-01

... ELECTRIC CURRENT, *CARBON NANOTUBES, *FIELD EFFECT TRANSISTORS, *ALTERNATING CURRENT, *DIRECT CURRENT, CHEMICAL ...

DTIC Science & Technology

15
Method of Producing a Piezoelectric Material.
1982-10-12

... A piezoelectric material is formed from conductively anisotropic crystals by exposing the crystals to an AC electrical field, cold-pressing the crystals ...

DTIC Science & Technology

16
AC Transport Current Loss in a Coated Superconductor in the ...
2004-04-01

... SUPERCONDUCTORS, *ELECTRIC FIELDS, *ALTERNATING CURRENT ... SURFACE PROPERTIES, THINNESS, SCALAR FUNCTIONS, LOSSES ...

DTIC Science & Technology

17
AC SOLENOID OF FINITE LENGTH IN A CONDUCTING ...
1964-06-01

... From the latter, the coil impedance and the ... FIELDS, HALL EFFECT, ELECTRICAL IMPEDANCE, COILS, VOLTAGE, CONDUCTIVITY ...

DTIC Science & Technology

18
Electric field in a single-substrate AC-PDP cell with barriers
1998-08-01

The electric field situation of three single-substrate AC- PDP cells has been investigated by computer simulation. The electric field distribution has been analyzed before firing and the period of extinguishing when charged particles deposited on the surface of the MgO layer. It is concluded ...

NASA Astrophysics Data System (ADS)

19
Spark Discharge Characteristics of Vehicles Energized by AC Electric Fields.
1980-01-01

This study examined certain characteristics of spark discharges from vehicles energized by an electric field. Vehicles were placed in an electric field produced by a 500-kv transmission line. Spark dischargers were delivered through a resistor to a driven...

National Technical Information Service (NTIS)

20
Effects of Electric Fields on Membrane-Bound Na, K-ATPase.
1989-01-01

The Na, K-ATPase of human erythrocytes can transport Na+ and K+ against their respective concentration gradient using the energy supplied by an a.c. electric field. It is a model for studying the interaction of an electric field and a cell at the molecula...

National Technical Information Service (NTIS)

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21
Three dimensional controlled assembly of gold nanoparticles using a micromachined platform

- ent of the electric field is maximum or minimum. Dielectro- phoresis occurs in both ac and dc electric

E-print Network

22
New polishing method using water-based slurry under AC electric field for glass substrate
2011-05-01

We proposed an AC electric field-assisted novel polishing method for borosilicate glass plate with water-based slurry. It has been found that the applied electric field operates effectively in positioning the slurry with abrasives in the polishing area. In-situ observations also confirmed that ...

NASA Astrophysics Data System (ADS)

23
Electrically tunable wettability of liquid crystal/polymer composite films

-LCD using a glass substrate and an anisotropic polymer film," J. Disp. Technol. 2, 21-25 (2006). #101323 composite film Glass Substrate In-plane electric field (AC) x z ITO electrodes LC/polymer composite film Glass Substrate In-plane electric field (AC) x z (a) ...

E-print Network

24
Effect of low-frequency ac fields on the phenomenon of ionic redistribution
1986-01-01

It has been established in a number of investigations that a phenomenon of ionic redistribution occurs when a dc electric field is applied to an ion-exchange system containing two or several counterions. In this work, the authors examine the effect of low-frequency ac electric fields on the ...

Energy Citations Database

25
Conformation and Dielectrophoresis of Single Weak Polyelectrolyte under AC Electric Field
2009-03-01

The application of AC-electric fields, when integrated with current microarray and ``lab-on-chip'' platforms, has emerged as a useful tool to manipulate and assemble supramolecular aggregates, such as AC-field induced protein crystallization and DNA hybridization, yet the detailed mechanism remains unclear. To understand the ...

NASA Astrophysics Data System (ADS)

26
Rotary electrorheological effect.
1995-01-01

The viscous response of electrorheological fluids is usually manipulated through the use of DC or uniaxial AC electric fields. The result is that fibrillated structures parallel to the field form in a quiescent fluid; the distortion of such structures in ...

National Technical Information Service (NTIS)

27
Electric-field-driven Phenomena for Manipulating Particles in Micro-Devices.
2004-01-01

Compared to other available methods, ac dielectrophoresis is particularly well-suited for the manipulation of minute particles in micro- and nano-fluidics. The essential advantage of this technique is that an ac field at a sufficiently high frequency supp...

National Technical Information Service (NTIS)

28
E-7--Influence of the Molecular Interaction on the Ac Kerr Effect Possibility of a Field-Induced Phase Transition.
1968-01-01

The influence of the molecular interaction on the orientation of polarizable molecules in the presence of a strong ac orienting electric field is considered. It is shown that, under certain conditions, a molecular system can be driven into a new ordered p...

National Technical Information Service (NTIS)

29
Electrical and Biological Effects of Transmission Lines: A Review.
1978-01-01

The electrical effects of power transmission lines and the effects that such lines may have on man and his environment are described. The electric effects include corona discharges, electric and magnetic field effects of ac lines, and induced currents and...

National Technical Information Service (NTIS)

30
Electrical and Biological Effects of Transmission Lines: A Review.
1977-01-01

This booklet describes the electrical effects of ac and dc transmission lines and reviews the state-of-the-art knowledge on the possible biologial effects of such lines. Electrical effects are defined as those resulting from electric and magnetic fields a...

National Technical Information Service (NTIS)

31
Electric Machine for Hybrid Motor Vehicle.
2004-01-01

A power system for a motor vehicle having an internal combustion engine and an electric machine is disclosed. The electric machine has a stator having coils for receiving ac electrical power to provide a magnetic field, a permanent magnet rotor spaced fro...

National Technical Information Service (NTIS)

32
Dynamic localization with an impurity under the action of an AC electric field
2000-09-01

We have investigated the motion of a charged particle in a one-dimensional system with an impurity under the action of AC electric field. We find that initially localized electron will remain localized if the ratio of the AC field magnitude and the frequency is a root of the ordinary zero-order ...

NASA Astrophysics Data System (ADS)

33
Manipulation, stability, and controlled release of micelles in AC-electric fields
2010-03-01

In this work, we explore the rich AC-electrokinetic effects to manipulate micelles of varied chemical structures and examine their stability in response to applied AC-electric fields. We investigate the AC-field induced transport and instability of sodium dodecyl sulfate (SDS) micelles and cetyl trimethylammonium ...

NASA Astrophysics Data System (ADS)

34
Fluid flow induced by nonuniform ac electric fields in electrolytes on microelectrodes. III. Observation of streamlines and numerical simulation

surfaces. Termed ac electro-osmosis, the flow has been studied experimentally and theoretically using and permittivity of the electrolyte. Al- though generated by ac fields, the fluid flow, referred to as ac electro-osmosis in the diffuse double layer on the electrode surface 1,4 . Consider two coplanar electrodes ...

E-print Network

35
Theory of the Nuclear Resonance Spectrum of a Polar Liquid in an Alternating Electric Field.
1966-01-01

It is suggested that the small secular effects produced in the NMR spectrum of a polar liquid as a result of molecular alignment in an electric field may be detected most easily through the sidebands produced when the field has an ac component. A general ...

National Technical Information Service (NTIS)

36
Theory of Paraelectric Resonance.
1966-01-01

The theoretical response of a paraelectric impurity to ac electric field has been derived for the system KCl:OH-. Electric field values for symmetry-allowed paraelectric transitions have been calculated as a function of microwave frequency for fields dire...

National Technical Information Service (NTIS)

37
Model Study of Electric Field Effects in Substations. Final Report.
1978-01-01

Five appendixes related to model studies of electric field effects in power substations are presented. Information is included on design of model components; design of 3-phase source; design of probes; electro-optic instrumentation for ac field strength m...

National Technical Information Service (NTIS)

38
Description of the Vector Electric Field ... - VEFI Home Page - NASA

field detector that gathers DC and AC (or wave) electric fields using the double probe ... Dynamics Explorer-2 (DE-2) satellite [Maynard et al., 1981], ...

NASA Website

39
Control of effect on the nucleation rate for hen egg white lysozyme crystals under application of an external ac electric field.
2011-06-09

The effect of an external ac electric field on the nucleation rate of hen egg white lysozyme crystals increased with an increase in the concentration of the precipitant used, which enabled the design of an electric double layer (EDL) formed at the inner surface of the drop in the oil. This is attributed to the ...

PubMed

40
Numeric description of space charge in polyethylene under ac electric fields
2010-12-01

Space charge in polyethylene-based insulation materials and its effect on the local electric field under a dc environment have been extensively examined over the last few decades while the behavior of space charge under ac stress has received less attention. Space charge phenomenon under ac ...

NASA Astrophysics Data System (ADS)

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41
Nanorod dynamics in ac electric fields.
2010-05-17

Metal and semiconductor nanorods polarized by an external electric field tend to align parallel to this field. We derived the equation of motion for this alignment, taking into account electrostatic forces, thermal fluctuations and viscous resistance of the liquid the nanorods are suspended in. It was solved for a strong ...

PubMed

42
AC Electrokinetic Flows
2010-01-01

Alternating current (AC) electrokinetic motion of colloidal particles suspended in an aqueous medium and subjected to a spatially nonuniform AC electric field are examined using a simple theoretical model that considers the relative magnitudes of dielectrophoresis, electrophoresis, ...

NASA Astrophysics Data System (ADS)

43
Output power enhancement of ac Raman free-electron laser
1987-01-01

The ac free-electron laser (ac FEL) uses an ac (temporally oscillating but spatially uniform) field as the pump source with the hope that electromagnetic radiation will be produced with wavelength shorter than that can be generated by a conventional magnet FEL. The ac field ...

DOE Information Bridge

44
The stability of natural convection in a vertical layer of dielectric fluid in the presence of a horizontal ac electric field
1984-05-01

The effect of a horizontal ac electric field on the stability of natural convection in a dielectric fluid contained between two parallel vertical plates of different temperatures is investigated analytically using linear stability theory. The eigenvalue system is modified and solved by the power-series method, and numerical results are ...

NASA Astrophysics Data System (ADS)

45
Observation of Carrier Behavior in Organic Field-Effect Transistors with Electroluminescence under AC Electric Field
2008-04-01

The carrier behavior in a tetracene thin film under AC electric field was examined by electroluminescence (EL) using the structure of organic field-effect transistors (OFETs). A square wave voltage was applied to the source electrode, whereas the drain and gate electrodes were connected to the ground. Electrons and ...

NASA Astrophysics Data System (ADS)

46
Model study of electric field effects in substations. Final report
1978-01-01

Five appendixes related to model studies of electric field effects in power substations are presented. Information is included on design of model components; design of 3-phase source; design of probes; electro-optic instrumentation for ac field strength measurements; and computer codes used for calculating the ...

Energy Citations Database

47
The AC-behavior of a hydrophilic and hydrophobic post insulator during rain
1994-07-01

The AC-behavior of a hydrophilic and a hydrophobic post insulator is studied during four different rain conditions by measuring the electric field distribution, resistive and capacitive leakage currents and UV-photography of the discharge activity. The results are in agreement with each other and show resistive ...

Energy Citations Database

48
Dielectric Breakdown Characteristics of Oil-pressboard Insulation System against AC/DC Superposed Voltage
2003-01-01

This paper describes breakdown characteristics of an oil-pressboard insulation system to a superposition voltage of AC and DC voltages. Although AC electric field is decided by the ratio of the relative permittivity of a pressboard and insulating oil, DC electric field is ...

NASA Astrophysics Data System (ADS)

49
Manipulation of bio-particles by means of nonuniform AC electric fields
2005-06-01

In this paper we examine the motion and behavior of particles suspended in aqueous solutions subjected to non-uniform ac electric fields. The particles can move due to forces exerted over them, or due to the motion of the surrounding liquid. In the first case, we have dielectrophoresis, due the action of ac ...

NASA Astrophysics Data System (ADS)

50
Reorganization of microfilament structure induced by ac electric fields
1996-11-01

AC electric fields induce redistribution of integral membrane proteins. Cell-surface receptor redistribution does not consistently follow electric field lines and depends critically on the frequency of the applied ac electric ...

Energy Citations Database

51
SCHEME FOR INCORPORATING DC MAGNETIC FIELDS INTO EPIDEMIOLOGICAL STUDIES OF EMF EXPOSURE

Experimental data on calcium-ion release in chicken brain tissue suggest that biological effects of electric and magnetic fields (EMFs) are concentrated at certain combinations of DC magnetic field strength and "critical" AC magnetic field frequencies. e hypothesize that "active"...

EPA Science Inventory

52
Transportable and Hybrid Transportable AC Systems.
2005-01-01

Between 2000 and 2003 Transportable AC Systems (TACS) and Hybrids (HTACS) were developed and demonstrated to support the electrical requirements of Command Centers in the field. Primary power was provided by unbreakable, lightweight, flexible solar module...

National Technical Information Service (NTIS)

53
Biosensor Assay Enhancement Through AC Electrokinetic Microstirring.
2006-01-01

A microstirring tool is developed to improve binding rates in biosensor devices by an order of magnitude. AC electric fields generate fluid motion through the well documented but unexploited phenomenon, Electrothermal Flow, where the circulating flow redi...

National Technical Information Service (NTIS)

54
Optical dc current and voltage measurement by superposing ac magnetic or electric field
1999-05-01

Optical DC current and voltage measurement using Faraday or Pockels effect necessitates the compensation of light intensity variation with some methods, because it is possible the intensity variation may give rise to a measuring error. We have proposed a method which suggests superposing AC magnetic field on linearly polarized light or ...

NASA Astrophysics Data System (ADS)

55
Untitled - NASA Technical Report Server (NTRS)

alternating current electric field meter and a two-axis search coil ac magnetometer to identify electric fields and .... Using a hand-held camera system aboard the orbiter with image ...... Tesla(unit of measurefor magneticflux density) ...

NASA Website

56
Research for electric energy systems. Annual report, December 1985
1986-03-01

Five subtasks are reported on: ac electric and magnetic fields, dc fields and ion measurements, gaseous dielectrics research (SF/sub 6/ mixtures), interfacial phenomena in liquids, and nanosecond breakdown in power system dielectrics. (DLC)

Energy Citations Database

57
Propulsion of nanowire diodes.
2010-02-04

The propulsion of semiconductor diode nanowires under external AC electric field is described. Such fuel-free electric field-induced nanowire propulsion offers considerable promise for diverse technological applications. PMID:20177595

PubMed

58
Injectable Sources of Locally Controlled Electrical Fields to Facilitate Tissue Repair.
2001-01-01

Both pulsatile (AC) and continuous (DC) electrical fields have been reported to increase growth or healing or otherwise modify the structure of various tissues, including nerves, bones and skin. Systematic application of these techniques in both animal re...

National Technical Information Service (NTIS)

59
Ultrasonic Mixing in Microfluidic Channels Using Integrated Transducers

mixer uses ac electric field-induced dielectro- phoretic (DEP) forces.17 DEP forces fold and stretch

E-print Network

60
Physics Letters A 324 (2004) 458�464 www.elsevier.com/locate/pla

of a polarizable particle which is subjected to an applied ac electric field is called dielectro- phoresis [1

E-print Network

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61
NASA Technical Reports Server

Selected Navigations: Subject > A-C [x]; Search Criteria: Search Field: All > Results : All > Search Term: (Accumulators Electric Batteries) [x] ...

NASA Website

62
Missions & Projects - + Sciences & Exploration Directorate - NASA

Results 1 - 25 of 177 ... VEFI also measures the vector AC electric field, which characterizes the ionospheric disturbances associated with spread-F ...

NASA Website

63
Military Handbook. Grounding, Bonding, and Shielding for ...
1987-12-29

... 1-138 1-69 Facility Power and AC Ground Distribution ..... ... 6-15 6-12 Electric Field Patterns in the Vicinity of a Radiating Dipole ..... ...

DTIC Science & Technology

64
Fluid flow induced by nonuniform ac electric fields in electrolytes on microelectrodes. I. Experimental measurements
2000-04-01

Under the influence of an ac electric field, electrolytes on planar microelectrodes exhibit fluid flow. The nonuniform electric field generated by the electrodes interacts with the suspending fluid through a number of mechanisms, giving rise to body forces and fluid flow. This paper presents ...

NASA Astrophysics Data System (ADS)

65
AC STABILIZED THETA-PINCH
1963-11-15

... This field produces electrical breakdown and a large azimuthal ... the 115 kV oscillator was applied to the pinched ... half-cycle of the main pinch current. ...

DTIC Science & Technology

66
Goddard Instruments - + Sciences & Exploration Directorate - NASA

Records 1 - 18 of 18 ... VEFI also measures the vector AC electric field, which characterizes the ionospheric disturbances associated with spread-F ...

NASA Website

67
Capacitor Components for 2 K Detectors - NASA's SBIR & STTR Programs

ALl ceramic samples are in the form of multilayer capacitors or can be made in ... and electric field will be measured at 2 K, as will the ac conductivity. ...

NASA Website

68
Alternating current electrokinetic motion of colloidal particles on interdigitated microelectrodes.
2008-03-05

Alternating current (ac) electrokinetic motion of colloidal particles suspended in an aqueous medium and subjected to a spatially nonuniform ac electric field are examined using a simple theoretical model that considers the relative magnitudes of dielectrophoresis, electrophoresis, ...

PubMed

69
DETERMINING THE ELECTRIC PARAMETERS OF AC ...
1960-03-01

... Accession Number : AD0655046. Title : DETERMINING THE ELECTRIC PARAMETERS OF AC CONDUCTORS FOR AIRCRAFT,. ...

DTIC Science & Technology

70
The rotary electrorheological effect
1995-12-31

The viscous response of electrorheological fluids is usually manipulated through the use of DC or uniaxial AC electric fields. The result is that fibrillated structures parallel to the field form in a quiescent fluid; the distortion of such structures in a flow determines the enhanced viscous response, at least at ...

Energy Citations Database

71
Fundamentals of electrical propulsion plant design
1982-04-01

Contents: electrical propulsion plant equipment requirements; dc electrical propulsion plant main current circuits; dc electrical propulsion plant field and regulation circuits; dc electrical propulsion plant protection, indication, and blocking circuits; calculation of the static ...

NASA Astrophysics Data System (ADS)

72
Electric fields effect on liftoff and blowoff of nonpremixed laminar jet flames in a coflow
2010-01-15

The stabilization characteristics of liftoff and blowoff in nonpremixed laminar jet flames in a coflow have been investigated experimentally for propane fuel by applying AC and DC electric fields to the fuel nozzle with a single-electrode configuration. The liftoff and blowoff velocities have been measured by varying the applied ...

Energy Citations Database

73
ac powered, thyristor-switched electric motors having superconducting fields
1975-09-30

An electric motor using thyristor switches to allow connection to an ac supply voltage is described. The thyristor switching is accomplished in part, by the use of a sensor which notes and uses relative positions of the magnetic fields of the armature and of the field to change the gate voltage applied to the ...

Energy Citations Database

74
THERMONUCLEAR REACTOR
1962-03-21

A pyrotron-type machine is designed for carrying out thermonuclear reactions. Loss of charged particles is minimized by reflecting them in an axially symmetrical magnetic field with an a-c electric field applied transversely to the magnetic field. (D.L.C.)

Energy Citations Database

75
DC electric field distribution in planar dielectric in the presence of space charge Z. Xu *

sample. The parameters used in the conductivity expression may have significant influence on the electricDC electric field distribution in planar dielectric in the presence of space charge Z. Xu * , W17 1BJ, United Kingdom * E-mail : zx04r@ecs.soton.ac.uk Abstract: Electric ...

E-print Network

76
Controlled deposition of drops on edible film using an AC-electric field
2008-11-01

We present a drop-based technique for the deposition of drug dosages onto an edible film. Unlike the common approach to utilize DC electric fields and metal nozzles, we use a nozzle made of an electrically insulating material and apply an AC electric field to form drops. ...

NASA Astrophysics Data System (ADS)

77
Microfluidic pumps based on Induced Charge Electroosmosis and flow Field Effect Transistor phenomena
2006-03-01

We are developing AC electrokinetic micropumps to drive electrically conductive biological fluids in microchannels. These pumps work on the principles of Induced Charge Electroosmosis (ICEO) and flow Field Effect Transistor (flowFET) phenomena. AC (as well as DC) electric ...

NASA Astrophysics Data System (ADS)

78
AC electric field driven microfluidic control and mixing
2005-03-01

The AC electrokinetic movement of fluids has its origin in two different physical mechanisms: AC electroosmosis, the interaction of the Electrical Double Layer induced on microelectrodes by an applied potential and the generated electric field; and electrothermal Electro-hydrodynamics, the ...

NASA Astrophysics Data System (ADS)

79
Frequency dependence of electrorheological fluids in an ac electric field
1995-12-01

The frequency dependence of the shear stress of electrorheological (ER) fluid has been studied. We find that the shear stresses of some water-free ER fluids increase monotonically with the frequency and tend to reach saturated values at high frequency. The measurements on KNbO3-silicone-oil ER fluid show that the shear stresses under a 103 Hz frequency ac ...

NASA Astrophysics Data System (ADS)

80
Investigation of microflow reversal by ac electrokinetics in orthogonal electrodes for micropump design
2008-04-04

Orthogonal electrodes have been reported to produce high velocity microflows when excited by ac signals, showing potential for micropumping applications. This paper investigates the microflow reversal phenomena in such orthogonal electrode micropumps. Three types of microflow fields were observed by changing the applied electric ...

PubMed Central

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81
Interactive Demonstration: Inductive Reactance
2009-08-01

Like resistance, reactance slows an electrical current down. Explained by Lenz's Law, this phenomenon occurs only in AC circuits. When an electric current flows through a circuit, it is opposed by two things: resistance and reactance. Resistance, found in both alternating current (AC) and direct current (DC), comes ...

NSDL National Science Digital Library

82
Collapse of DNA in ac Electric Fields.
2011-06-16

We report that double-stranded DNA collapses in the presence of ac electric fields at frequencies of a few hundred Hertz, and does not stretch as commonly assumed. In particular, we show that confinement-stretched DNA can collapse to about one quarter of its equilibrium length. We propose that this effect is based on finite relaxation ...

PubMed

83
Collapse of DNA in ac Electric Fields
2011-06-01

We report that double-stranded DNA collapses in the presence of ac electric fields at frequencies of a few hundred Hertz, and does not stretch as commonly assumed. In particular, we show that confinement-stretched DNA can collapse to about one quarter of its equilibrium length. We propose that this effect is based on finite relaxation ...

NASA Astrophysics Data System (ADS)

84
Leakage detection system for radioactive waste storage tanks
1979-08-28

The patent describes a combination of elements for detecting leakage of electrically conductive fluids from tanks, including a reference electrode, an AC generator connected between the tank and the reference electrode, and one or more sensing electrodes positioned between the tank and the reference electrode. The storage tank and reference electrode are ...

Energy Citations Database

85
Elf electromagnetic field effects on life forms: bibliography. Technical report
1976-04-01

During the course of a study, supported by an IITRI project with the Electric Power Research Institute, some 2300 references were identified which were then reduced to some 800 citations. With that as a starting point, this bibliography has been prepared to aid in the assessment of extremely low frequency biological research. This bibliography emphasizes the following areas: ...

Energy Citations Database

86
PIV Measurements of Particle and Fluid Motion Induced by AC Electric Fields
2003-11-01

The techniques to induce particle and fluid motion inside microsystems using ac electric fields have important applications in sensing and manipulating bioparticles. Micron-Resolution Particle Image Velocimetry (m-PIV) is a powerful tool to measure the spatially resolved motion with resolution approaching 1mm. In the presence of ...

NASA Astrophysics Data System (ADS)

87
Nonlinear response of the electric birefringence of polyelectrolyte solutions.
2010-11-23

A theoretical approach for the nonlinear ac electro-optical response in polyelectrolytes is developed in the case where a weak ac electric field superimposed on a strong dc bias electric field is applied to these electrically charged systems. By ...

PubMed

88
Nonlinear response of the electric birefringence of polyelectrolyte solutions
2010-12-01

A theoretical approach for the nonlinear ac electro-optical response in polyelectrolytes is developed in the case where a weak ac electric field superimposed on a strong dc bias electric field is applied to these electrically charged systems. By ...

NASA Astrophysics Data System (ADS)

89
Electrical Stimulation of Microbial Waste Treatment.
1973-01-01

This project has been directed towards the evaluation of the effect of electrical fields, AC and DC, on the metabolism and growth of microorganisms. Test systems used were batch culture, (Aerobic and anaerobic), continuous culture, and the use of genetic ...

National Technical Information Service (NTIS)

90
Electroporation of cells using EM induction of ac fields by a magnetic stimulator.
2010-02-02

This paper describes a method of effectively electroporating mammalian cell membranes with pulsed alternating-current (ac) electric fields at field strengths of 30-160 kV m(-1). Although many in vivo electroporation protocols entail applying square wave or monotonically decreasing pulses via needles or electrode ...

PubMed

91
Electroporation of cells using EM induction of ac fields by a magnetic stimulator
2010-02-01

This paper describes a method of effectively electroporating mammalian cell membranes with pulsed alternating-current (ac) electric fields at field strengths of 30-160 kV m?1. Although many in vivo electroporation protocols entail applying square wave or monotonically decreasing pulses via needles or electrode ...

NASA Astrophysics Data System (ADS)

92
Effect of a change in the optical density of a magnetic emulsion in electric and magnetic fields
2008-02-01

The change in the optical density of an emulsion of magnetic fluid drops suspended in a mineral oil under the action of electric and magnetic fields has been investigated. It is found that the sign of the change in transparency in an ac electric field depends on the field ...

NASA Astrophysics Data System (ADS)

93
Removal of Impurity Ions from Helical Devices by a Trapping/Detrapping Process
2004-09-15

Heavy impurity ions can be removed from the toroidal magnetic trap in the helical magnetic field of a conventional torsatron or heliotron with the use of an alternating current (ac) electric field. The passing particles can be transformed into helically trapped ones and escape from the magnetic confinement volume ...

Energy Citations Database

94
Induced voltages on fence wires and pipelines by AC power transmission lines

A method is developed for calculating the induced voltages on fence wires/pipelines underneath AC power transmission lines. The method is based on the charge simulation technique and takes into account the disturbances of the electric field and potential due to the presence of the fence wire/pipeline underneath the line. The calculated ...

Energy Citations Database

95
Nonlinear Electron Transport Effects in a Chiral Carbon Nanotube
1997-08-01

We present a novel, general, semiclassical theory of electron transport in a carbon nanotube exposed to an external electric field. The charge carriers are treated in the framework of the simplified tight-binding model. Simultaneous exposure to rapidly oscillating (ac) and constant (dc) electric ...

Energy Citations Database

96
Bloch electron spontaneous emission from a single energy band in a classical ac field
2009-10-01

A theory for the spontaneous emission of radiation for a Bloch electron in a single superlattice (SL) energy band under the influence of an external, spatially homogeneous, classical ac electric field is presented. The classical external ac electric field is described in ...

NASA Astrophysics Data System (ADS)

97
Static and dynamic responses of polyelectrolyte brushes under external electric field
2009-05-01

The static and dynamic behaviors of partially charged and end-grafted polyelectrolyte brushes in response to electric fields were investigated by means of molecular dynamics simulation. The results show that the polymer brushes can be partially or fully stretched by applying an external electric field. Moreover, ...

NASA Astrophysics Data System (ADS)

98
Electrical and Biological Effects of Transmission Lines: A Review.
1989-06-01

This review describes the electrical properties of a-c and d-c transmission lines and the resulting effects on plants, animals, and people. Methods used by BPA to mitigate undesirable effects are also discussed. Although much of the information in this review pertains to high-voltage transmission lines, information on distribution lines and ...

DOE Information Bridge

99
AC-Electrokinetic Characterization and Induced Encapsulation Release of Micelles in Aqueous Suspensions
2011-03-01

Micelles and polymers vesicles have been of increasing interest as drug delivery systems for controlled release, specific cell targeting, and medical diagnostics. In addition, AC-electrokinetic techniques have emerged as a viable option for colloidal and biocolloidal manipulation. In this work, we examine the dielectrophoresis (DEP) characteristics of complex micellar ...

NASA Astrophysics Data System (ADS)

100
A Satellite Survey of Vector Electric Fields in the Ionosphere at Frequencies from 10 to 500 Hertz. 3. Low Frequency Equatorial Emissions and Their Relationship to Ionospheric Turbulence.
1971-01-01

Occasional observations of intense low frequency electric field fluctuations have been detected near the magnetic equator by the vector ac electric field experiment performed on the OV1-17 satellite which was in a circular polar orbit at an altitude of ab...

National Technical Information Service (NTIS)

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101
Stark effect on FIR waveguide laser action
1977-06-01

Some experimental results of the application of small electric fields on an optically pumped metal-dielectric far infrared (FIR) waveguide laser are shown. It is demonstrated that sizable modulation of the FIR output power can be obtained with ac fields.

Energy Citations Database

102
Optical Fiber Interferometer to Study Surface Charges Produced by Triboelectric Forces.
1986-01-01

The purpose of the study is to establish the feasibility of using an optical fiber interferometer to measure the electric field generated by surface charges. A Fourier transform method was devised to measure AC fields even under changing environmental con...

National Technical Information Service (NTIS)

103
Method of Producing a Piezoelectric Material.
1982-01-01

A piezoelectric material is formed from conductively anisotropic crystals by exposing the crystals to an AC electrical field, cold-pressing the crystals while still under the influence of the field, then processing the crystals to a dense piezoelectric ma...

National Technical Information Service (NTIS)

104
Finding turn-to-turn shorts in rotating fields
1996-06-01

This article describes methods for finding turn-to-turn shorts in rotors of electrical generators. Locating such shorts can be accomplished by comparing the DC resistance or AC impedance of field coils. The experiences of two utilities with the latter method are discussed.

Energy Citations Database

105
Development of a Dual-Field Heteropoplar Power Converter.
1981-01-01

The design and testing of a 400 watt, dual phase, dual rotor, field modulated inductor alternator is described. The system is designed for use as a flywheel to ac utility line or flywheel to dc bus (electric vehicle) power converter. The machine is unique...

National Technical Information Service (NTIS)

106
Alternating current loss calculation in a high-TC superconducting transmission cable considering the magnetic field distribution
2003-01-01

We have calculated the alternating current (ac) losses of a 114 MVA high-TC superconducting (HTS) transmission cable using an electric-circuit (EC) model. The HTS cable is fabricated by Tokyo Electric Power Company and Sumitomo Electric Industries, Ltd. The EC model is comprised of a resistive part and an inductive ...

NASA Astrophysics Data System (ADS)

107
The Frequency Dependence of Phospholipid Vesicle Shapes in an External Electric Field
1999-01-01

Experiments show that phospholipid vesicles exposed to AC electric field undergo a shape transition from prolate to oblate ellipsoidal shape when the frequency of the field is increased. In a theoretical model that has been devised to explain this phenomenon for nearly spherical vesicles, the vesicle shape is ...

E-print Network

108
Negative, positive, and infinite mass properties of a rotating electron beam
2010-09-01

An electron rotating under a uniform axial magnetic field and a radial electric field exhibits an effective mass that may be negative, positive, or infinite, in response to an azimuthal electric field. This paper reports simulation results that show instability and stability when the effective ...

NASA Astrophysics Data System (ADS)

109
Liquid-air interface instability due to an in-plane electric field
2011-03-01

We report observations of an instability at the free surface of a liquid due to an in-plane electric field. The horizontal air-liquid interface in a partially filled sample cell between vertical electrodes exhibited first oscillations, then increasingly turbulent fluctuations as the strength of the horizontal electric ...

NASA Astrophysics Data System (ADS)

110
AC MAGNETIC FIELDS IN THE VICINITY OF A CRACK ...
1979-07-01

... Title : AC MAGNETIC FIELDS IN THE ... CALCULATIONS OF THE IMPEDANCE OF A ... IS ACCOMPLISHED BY TWO INDEPENDENT METHODS. ...

DTIC Science & Technology

111
Effects of magnetic fields from underwater electrical cutting on in vitro corrosion of dental amalgam
1988-11-01

Metallic taste has been reported from divers working with underwater electric welding and cutting. An in vitro model was designed to simulate the intraoral situation of the divers with respect to the magnetic field. Potentiostatic analyses were performed on amalgam samples exposed to AC and DC magnetic fields. ...

Energy Citations Database

112
Band Formation in Mixtures of Oppositely Charged Colloids Driven by an ac Electric Field
2011-06-01

We present experiments on pattern formation in a Brownian system of oppositely charged colloids driven by an ac electric field. Using confocal laser scanning microscopy we observe complete segregation of the two particle species into bands perpendicular to a field of sufficient strength when the frequency is in a ...

NASA Astrophysics Data System (ADS)

113
An examination of the effect of an AC pulsed electric field on cell mortality in SWLA-2 hybridomas.
2004-01-01

This work describes the initial experimental setup and results involving the percentage cell lysis in SWLA-2 murine hybridomas produced by AC electric field pulses of varying amplitudes and pulse widths. Cells were cultured and separate samples examined at 24 hours. The frequency, pulse width and peak-to-peak voltage were varied. ...

PubMed

114
Observation of Electron Injection into Organic Field-Effect Transistor with Au Electrodes using Electroluminescence under AC Electric Field
2008-02-01

The electroluminescence (EL) from a tetracene field-effect transistor was examined by applying an AC voltage to elucidate electron injection from the source and drain Au electrodes. The EL intensity was proportional to the AC frequency up to 500 kHz, but it decayed rapidly with elapsed time when applying the AC ...

NASA Astrophysics Data System (ADS)

115
Role of electric field on surface wetting of polystyrene surface.
2011-06-30

The role of surface charge in fluid flow in micro/nanofluidics systems as well as the role of electric field to create switchable hydrophobic surfaces is of interest. In this work, the contact angle (CA) and contact angle hysteresis (CAH) of a droplet of deionized (DI) water were measured with applied direct current (DC) and alternating current ...

PubMed

116
Organic photovoltaic power conversion efficiency improved by AC electric field alignment during fabrication
2011-08-01

Ultra-low frequency AC field was employed to align p/n polymers during organic photovoltaic device fabrication. The resulting devices show 15% increase in power conversion efficiency and four-fold increase in parallel resistance. Supported by the transmission electron microscopy and atomic force microscopy images, the performance enhancement is attributed ...

NASA Astrophysics Data System (ADS)

117
THE USE OF AC FOR STRUCTURAL ANALYSIS OF ...
1965-02-01

... Title : THE USE OF AC FOR STRUCTURAL ANALYSIS OF FERROMAGNETIC MATERIAL BY THE ELECTRIC RESISTANCE METHOD. ...

DTIC Science & Technology

118
NONDESTRUCTIVE ELECTRICAL METHOD OF ...
1980-11-01

... IS BASED ON AN AC METHOD KNOWN IN ... WHEN AC CURRENT FLOWS THROUGH THE SYSTEM, IT ... LAYER AND AN IMPEDANCE OF THE ...

DTIC Science & Technology

119
Influence of electrical fields (AC and DC) on phytoremediation of metal polluted soils with rapeseed (Brassica napus) and tobacco (Nicotiana tabacum).
2011-01-14

The combined use of electrokinetic remediation and phytoremediation to decontaminate soil polluted with heavy metals has been demonstrated in a laboratory-scale experiment. The plants species selected were rapeseed and tobacco. Three kinds of soil were used: un-contaminated soil from forest area (S1), artificially contaminated soil with 15mgkg(-1) Cd (S2) and multi-contaminated soil with Cd, Zn ...

PubMed

120
Self-Assembled Gold Nanowires from Nanoparticles
2005-03-01

We present a new technique for fabricating gold nanowires using carbon nanotubes as the template. By applying an ac voltage to an electrically contacted single walled carbon nanotube, we generate highly non-uniform ac electric fields in the vicinity of the nanotubes. These ...

NASA Astrophysics Data System (ADS)

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121
Microtubule alignment and manipulation using AC electrokinetics.
2008-09-01

The kinesin-microtubule system plays an important role in intracellular transport and is a model system for integrating biomotor-driven transport into microengineered devices. AC electrokinetics provides a novel tool for manipulating and organizing microtubules in solution, enabling new experimental geometries for investigating and controlling the interactions of microtubules ...

PubMed

122
Stability of Spherical Vesicles in Electric Fields
2010-06-24

The stability of spherical vesicles in alternating (ac) electric fields is studied theoretically for asymmetric conductivity conditions across their membranes. The vesicle deformation is obtained from a balance between the curvature elastic energies and the work done by the Maxwell stresses. The present theory describes and clarifies ...

PubMed Central

123
Biological effects of electric fields: EPRI's role
1982-07-01

Since 1973 the Electric Power Research Institute (EPRI) has supported research to evaluate the biological effects which may result from exposure to electric fields produced by AC overhead transmission lines; more recently, EPRI has also begun DC research. Through 1981 EPRI will have expended $8.7M on these efforts. ...

Energy Citations Database

124
Rotary electrical machines comprising a superconductive winding
1977-01-04

A rotary motor has a superconducting freely spinning field winding, ac armature windings and electrically conductive screen means connected to an output shaft. The field winding consists of a flat winding delivering a magnetic field whose lines of flux are parallel to the axis. The armature ...

Energy Citations Database

125
Radiation pattern from a cold magnetoplasma antenna
2009-07-15

In this paper a theoretical study of the radiation pattern of an antenna build up from a confined magnetoplasma is made. Assuming that the electron gas is in the linear regime, we derived expressions for the conductivity tensor of the plasma and the radiated electromagnetic field under the influence of both dc magnetic and ac electric ...

Energy Citations Database

126
ac electrokinetic phenomena over semiconductive surfaces: Effective electric boundary conditions and their applications.
2011-06-01

Electrokinetic boundary conditions are derived for ac electrokinetic phenomena over leaky dielectric (i.e., semiconducting) surfaces. Such boundary conditions correlate the electric potentials across a semiconductor-electrolyte interface (consisting of an electric double layer inside the electrolyte solution and a space charge layer ...

PubMed

127
ac electrokinetic phenomena over semiconductive surfaces: Effective electric boundary conditions and their applications
2011-06-01

Electrokinetic boundary conditions are derived for ac electrokinetic phenomena over leaky dielectric (i.e., semiconducting) surfaces. Such boundary conditions correlate the electric potentials across a semiconductor-electrolyte interface (consisting of an electric double layer inside the electrolyte solution and a space charge layer ...

NASA Astrophysics Data System (ADS)

128
Nonlinear ac responses of electro-magnetorheological fluids.
2004-10-15

We apply a Langevin model to investigate the nonlinear ac responses of electro-magnetorheological (ERMR) fluids under the application of two crossed dc magnetic (z axis) and electric (x axis) fields and a probing ac sinusoidal magnetic field. We focus on the influence of the magnetic ...

PubMed

129
Electrohydrodynamics and dielectrophoresis in microsystems: scaling laws
2003-10-01

The movement and behaviour of particles suspended in aqueous solutions subjected to non-uniform ac electric fields is examined. The ac electric fields induce movement of polarizable particles, a phenomenon known as dielectrophoresis. The high strength ...

NASA Astrophysics Data System (ADS)

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