... of the Transient Electromagnetic ... Descriptors : *COUPLING(INTERACTION), *ELECTROMAGNETIC FIELDS ... PULSES, TRANSIENTS, SCATTERING ...

... Transient Electromagnetic Coupling through Slabs. ... sinusoidal and transient excitations ... STEADY STATE, TRANSIENTS, MATERIALS, TRANSPORT ...

... Descriptors : *AERIAL RECONNAISSANCE, *ELECTROMAGNETIC FIELDS, *GEOPHYSICAL PROSPECTING, TRANSIENTS, MATHEMATICAL ...

The travel time of a nuclear shock wave from its point of origin to a location can be determined accurately by an apparatus for noting and comparably recording both zerotime, as indicated by the electromagnetic transient associated with the nuclear detonation, and shock wave arrival time.

This paper introduces a way of modeling electromagnetic propagation in conductive materials, termed the method of finite sections. It addresses the issues of modeling frequency-dependent impedances and frequency-dependent coupling of conductors. Its use is demonstrated by application to transient modeling of a multi-mode coaxial cable system in the ...

The Electromagnetic Transients Program (EMTP) is a computer program for the simulation of electric power system transient phenomena. The program provides a large set of device models permitting accurate modeling of power system components over a wide frequency range. Traditionally, this program has existed only in ...

... Accession Number : ADA345008. Title : Transient Response of an Electromagnetic Rail Gun: A Pedagogical Model. Corporate ...

... Title : Transient Interaction of Electromagnetic Pulses in Dielectrics and Microwave Biophysics. Descriptive Note : Final rept. ...

... Accession Number : ADA195687. Title : Transient Interaction of Electromagnetic Pulses in Dielectrics and Microwave Biophysics. ...

... Electromagnetic Scattering from Heterogeneous Lossy Spheres. ... HETEROGENEITY, LOSSES, SPHERES, TRANSIENT RADIATION EFFECTS. ...

... of the direct strike. ... Descriptors : *LIGHTNING, *ELECTROMAGNETIC INDUCTION ... ELECTROMAGNETIC FIELDS, DETECTION, ELECTRONIC ...

... Provides detailed search and analysis capabilities across the ... Representation of the Transient Electromagnetic Coupling through a ...

... THESIS PERFORMANCE ENHANCEMENT OF THE NPS TRANSIENT ELECTROMAGNETIC SCATTERING LABORATORY by Aldo E. Bresani ...

... Title : Performance Enhancement of the NPS Transient Electromagnetic Scattering Laboratory. Descriptive Note : Master's thesis. ...

... FLOWMETERS, ACCELERATION, ELECTRONICS, FLOW, TRANSIENTS, FALLING BODIES, WATER, MAGNET COILS, ELECTRODES, SIGNALS ...

Electromagnetic compatibility studies require knowledge of transient voltages that may be developed near earthing systems during lightning discharge, since such voltages may be coupled to sensitive electronic circuits. For such purpose accurate evaluation of transient electric field near to and/or at the surface of ...

... Accession Number : ADA534986. Title : Accurate Modeling of Ionospheric Electromagnetic Fields Generated by a Low Altitude VLF Transmitter. ...

The electromagnetic pulse (EMP) produced by a high-altitude nuclear detonation consists of a transient pulse of high intensity electromagnetic fields. These intense fields induce current and voltage transients in electrical conductors. Although nuclear po...

General properties of the solutions to transient electromagnetic scattering problems are described. Electromagnetic field waveforms produced by the scattering of transient plane waves from finite objects are related to those produced by an impulsive plane...

Little quantitative data exists on radiated electromagnetic interference in substations arising from substation transients. The electromagnetic transient noise produced by normal substation activity such as opening switches and breakers can be significant...

The paper presents a methodology for the closed form calculation of electromagnetic transients in power system networks, resulting from sequential switching operations. The system is viewed from the terminals of the switch poles where a compensating voltage source is applied for closing and a compensating current source is applied for opening of a pole. ...

This dissertation addresses three different problems in power systems. The first problem is related to the fault location in complex topologies such as three terminal circuits with series compensation and mutually coupled line sections and distribution networks with distributed generation. Novel methods are presented by using traveling wave approach and wavelet transformation technique to overcome ...

Mar 1, 2011 ... A technique by which electromagnetic exciters are controlled to produce specific time-history transient waveforms is discussed.

... Title : Electromagnetic Pulse/Transient Threat Testing of Protection Devices for Amateur/Military Affiliate Radio System Equipment. ...

... therapy and imaging. Electromagnetic transients, potential medical applications, and anticipated research avenues relevant to occupational health ...

... Accession Number : AD0295107. Title : STUDY OF ELECTRO-MAGNETIC PROPAGATION OF A TRANSIENT SIGNAL THROUGH SEA WATER. ...

... Accession Number : AD0258631. Title : STUDY OF ELECTRO-MAGNETIC PROPAGATION OF A TRANSIENT SIGNAL THROUGH SEA WATER. ...

... ABSTRACT The basic theory of airborne EM surveying, in the time donrain, i3 considered. ... borne electromagnetic geophysical surveys. ...

... Title : Modeling and Analysis of ... ELECTROMAGNETIC RADIATION, *TRANSIENT RADIATION ... HYBRID SIMULATION, COUPLING(INTERACTION ...

... across the military departments and agencies for Research ... Title : Component Damage from Electromagnetic Pulse (EMP) Induced Transients ...

This paper presents the theory and results of a new real-time digital simulator of transmission lines. The simulator is based on time domain formulation. It obtains the electromagnetic transient performance of balanced three-phase lines in real-time. Sample results of energizing a transmission line from balanced and unbalanced sources are presented. The ...

This paper addresses the problem of computing the ground potential rise of grounding systems during transients. Finite element analysis is employed to model the constituent parts of a grounding system. Short lengths of earth embedded electrodes are characterized as transmission lines with distributed inductance, capacitance and leakage resistance to earth. Leakage resistance ...

... U- ELECTROMAGNETIC PULSE. TESTING ... 11 TITLE fInclude Security Classification) Electromagnetic Pulse Tit Testing of Protection Device; - - ...

Representative data on the electromagnetic environment such as voltage transients and electromagnetic field strengths is provided which can form the basis for immunity specifications. It is presented in terms of the various types of interference sources a...

A numerical method for modeling the high rate deformation and impact that occurs during the electromagnetic forming process is presented with supporting experimental data, used to validate the predictions. The numerical model employs �loose" two-way coupling of the electromagnetic analysis with the elastic-plastic structural analysis. An ...

The three-dimensional (3-D) electromagnetic-scattering problem is first formulated in the frequency domain in terms of an electric-field volume-integral equation. Three-dimensional responses are then Fourier-transformed with wine and cosine digital filters. The digital-filter technique is applied to a sparsely sampled frequency sounding, which is replaced by a cubic-spline ...

... TRANSIENT RADIATION EFFECTS, ELECTROMAGNETIC INTERFERENCE, AURORAE, POLAR REGIONS, SPACE ENVIRONMENTS, HIGH ...

... LINES, *ELECTRIC CABLES, *ELECTROMAGNETIC PULSES, * RADIOFREQUENCY CABLES, *COAXIAL CABLES, POLARIZATION, DAMAGE ...

... the safety risks associated with the operation of the Naval Ordnance Transient Electromagnetic Simulator (NOTES) in Pumpkin Neck, Virginia. ...

... Descriptors : *ANTENNAS, COUPLING(INTERACTION ... CIRCUIT ANALYSIS, ELECTROMAGNETIC ... STRUCTURES, TRANSIENT RADIATION ...

... ELECTRIC CABLES, ELECTRIC CONNECTORS, COAXIAL CABLES, ANTENNAS, ELECTROMAGNETIC WAVE FILTERS, TRANSIENTS ...

... ELECTROMAGNETIC RADIATION, SCALING FACTOR, MAXWELLS EQUATIONS, TIME DOMAIN, WAVE EQUATIONS, TRUNCATION. ...

... TM- 3494 DISTORTION AND REGENERATION OF ELECTROMAGNETIC TRANSIENTS AFTER THEIR PROPAGATION AS GROUND WAVES ...

Jan 22, 2011 ... Title: Accurate electromagnetic modeling of terahertz detectors. Authors: Focardi, Paolo McGrath, William R. Keywords: slot antennas ...

The electromagnetic pulse (EMP) from a high-altitude nuclear detonation consists of a transient pulse of high intensity electromagnetic fields. These intense fields induce current and voltage transients in electrical conductors. Although most nuclear powe...

The study of the EMP phenomenon has promoted the development of techniques to investigate transient electromagnetic response data. Characterization of the EMP transient response information is necessary to evaluate the performance of that system in a host...

... about the extent to which accurate predictions of random transient phenomena could be made and about the measurement interpretation of the ...

Over the last 50 years, digital simulation of electric power systems has become an integral part for planning, design and operation in the power industry. The number of possibilities with respect to the purpose of a study, investigated frequency ranges, etc. with, in the past, limited computer resources has resulted in a spectrum of simulation tools, designed to handle very specific tasks. ...

... spherical elastic shells coupled by an ... calculation of accurate transient solutions of ... Descriptors : *TRANSIENTS, *PULSES, *PRESSURE, *ELASTIC ...

There is concern that high power sources of electromagnetic radiation may cause physical harm to an exposed individual even when the frequencies are below those of x rays. Specifically concerns arise in the use of microwave equipment, radars, lasers, active imaging devices, and transmitters. Early efforts to address this question considered total absorbed power and then local ...

Recent experimental data on iontzation distribution at high altitudes were obtained by means of rockets. These data define more accurately the structure of the ionosphere It is concluded that ionization density is a function of altitude. Discussion is given on the effects of ionization distribution on radio wave propagaton, absorption of radio waves, ...

A computer program for three-dimensional transient analyses of welding processes has been modified for use on massively parallel computers. The model is based on discrete element method that takes into account geometric variations of an object, heat transfer, fluid flow, deformable free surface, solid/liquid interface, buoyancy, electromagnetic and surface ...

Accurate minority carrier recombination rate measurements by new capacitance transient method of Ti,

Abstract: This data set contains time-domain electromagnetic (TEM) soundings ... center of the transmitter loop, layered-earth model best fitting the data. ...

... Characterization of Saltwater Intrusion in South Florida Using Electromagnetic Geophysical Methods, report, 18th Salt Water Intrusion Meeting, ...

This data set contains time-domain electromagnetic (TEM) soundings collected at 63 sites in and near Everglades National Park. The data set includes the ... ...

... VOLUME II1 TEST DATA CD ELECTROMAGNETIC PULSE TESTING OF PROTECTION DEVICES SECTION 6 EQUIPMENT AND DEVICES ...

... TPM), part of the PASP Plus experiment aboard the APEX spacecraft, is designed to detect and characterize electromagnetic transient signals ...

Contents: Transient Processes in Transmission Lines; Transient Processes in Transmission Lines with the Discrete Heterogeneities. Transformation of Pulses; Impulse Shaping in Linear Distributed Circuits; Impulse Shaping from the Shock Electromagnetic Wave...

... that the highest transient voltage transmitted through a residential power distribution breaker box ... U 11 their electric insulation. ... Power connections ...

The cylindrical antenna, driven at its center by some transient voltage input and symmetrically loaded with lumped resistors, has been found to be a useful electromagnetic pulse generator. In a previous study, a procedure was developed for selecting resis...

Induction theorem is used to formulate the problem of transient electromagnetic excitation of a rectangular cavity through an aperture. New variables are introduced to convert the governing second-order differential equation into a set of first-order equa...

The paper is concerned with the generation of transient electromagnetic force and its application to metal working processes as forming force. The main purposes are to get the higher formability and accuracies of deformed parts comparing with conventional...

The receiving and transmitting properties of small linear antennas, conical antennas, and loops for transient electromagnetic fields were investigated experimentally. Short electrical dipoles loaded by a capacitance represented by a cathode follower can b...

Analytical and numerical techniques were developed for modeling transient electromagnetic wave propagation in dispersive dielectrics. Time domain asymptotic techniques were used to understand the decay of pulses in such media and to develop energy estimat...

This report describes the various techniques and algorithms developed to enhance the accuracy of the measurements of very fast transient electromagnetic fields generated during EMP testing. Some fundamentals of digital signal processing are presented and ...

Analysis of Transient Electromagnetic Scattering from Two-Dimensional Open-Ended Structures by Numerical Inversion of Laplace Transform

... Accession Number : ADA308099. Title : Wideband Signal Analysis and Synthesis Applied to Electromagnetic Transient Waveforms. ...

... RADIOBIOLOGY, TRANSIENTS, DIELECTRIC PROPERTIES, NERVE CELLS, MUSCLES, THERMAL STRESSES, FROGS, EAR, RADIATION ...

... transient fields as they propagate over the earth's surface has a long history; Sommerfield considered the propagation of radio waves over an ...

... The production and acceleration of plasma toroids is essentially a transient process ... t A bundle of incoherent fiber optics were stationed at the exit of ...

... of the theoretical models used to predict the inductance gradient, the transient behavior of the currents produced in the rail gun structure, the ...

A consequence of an exoatmospheric nuclear burst is an electromagnetic pulse (EMP) radiated from it.

... PROPERTIES, *SUPERSONIC FLOW, *TRANSIENTS, AIRFRAMES, BEAMS(ELECTROMAGNETIC), BEAMS(STRUCTURAL), BLUNT BODIES ...

... Report Date : 27 MAR 1968. Pagination or Media Count : 228. Abstract : A linear system analysis is applied to electromagnetic scattering problems. ...

... physical insight into the coupling of radiated ... determine how the wire transients will change ... approach involved frequency domain analysis based on ...

... Title : Bandwidth and Signal-to-Noise Ratio Enhancement of the NPS Transient Electromagnetic Scattering Laboratory. ...

... Abstract : Partial Contents: A Finite Element Analysis of Lightning Induced Maxwell Current Densities; Transient Electromagnetic Coupling To A ...

The ZR accelerator is a refurbishment of Sandia National Laboratories Z accelerator [1]. The ZR accelerator components were designed using electrostatic and circuit modeling tools. Transient electromagnetic modeling has played a complementary role in the analysis of ZR components [2]. In this paper we describe a 3D transient ...

of Equation (2) can be thought of as the sensitivity for the measurement of the transient electric field at rOptimizing Electric Dipole Source, Transient Electromagnetic Data Acquisition Configuration Using In the past few years, there has been a growing interest in the electric dipole source electromagnetic (EM

The Electromagnetic Transients Program (EMTP) is a computer program used to simulate electromagnetic, electromechanical, and control system transients on multi-phase electric power systems. Section headings in this volume include the following: Ideal Sour...

The Electromagnetic Transients Program (EMTP) is a computer program used to simulate electromagnetic, electromechanical, and control system transients on multiphase electric power systems. Section headings in this volume include the following: HVDC Model Applications; Frequency Dependent Network Equivalents (FDNE); ...

The wavelet transform is introduced as a method for analyzing electromagnetic transients associated with power system faults and switching. This method, like the fourier transform, provides information related to the frequency composition of a waveform, but it is more appropriate than the familiar Fourier methods for the non-periodic, wide-band signals ...

Electromagnetic forming (EMF) is a forming process that relies on the inductive electromagnetic force to deform metallic workpiece at high speed. Calculation of the electromagnetic force is essential to understand the EMF process. However, accurate calculation requires complex numerical solution, in which the ...

Electromagnetic forming (EMF) is a forming process that relies on the inductive electromagnetic force to deform metallic workpiece at high speed. Calculation of the electromagnetic force is essential to understand the EMF process. However, accurate calculation requires complex numerical solution, in which the ...

In modeling electromagnetic responses, Maxwell's equations in the frequency domain are popular and have been widely used (Nabighian, 1994; Newman and Alumbaugh, 1995; Smith, 1996, to list a few). Recently, electromagnetic modeling in the time domain using...

A single, high-altitude nuclear detonation over the continental United States can expose large geographic areas to transient, electromagnetic pulse (EMP). The initial electromagnetic fields produced by this event have been defined as high-altitude electro...

The response of an object subjected to high energy, transient electromagnetic (EM) fields sometimes called electromagnetic pulses (EMP), is an important issue in the survivability of electronic systems (e.g., aircraft), especially when the field has been ...

This technical report discusses the vulnerability of equipment used by amateur/MARS radio operators in the United States to disruption or damage by transient electromagnetic effects such as lightning, voltage surges, and electromagnetic pulse (EMP) waves....

The operation and hardware of the Lawrence Livermore Laboratory's transient-electromagnetics (EM)-measurement facility are described. The transient-EM range is useful for determining the time-domain transient responses of structures to incident EM pulses. To illustrate the accuracy and utility of the EM-measurement ...

The paper presents experimental observations from which the characteristics of disconnect switch-generated transients are deduced. The measurements show that the very fast rise times associated with these transients give rise to abnormally low volt-time c...

The broadband electromagnetic pulse (EMP) transient measurement preemphasis filter ( Filter ) was developed to improve the signal-to-noise ratio in the high-frequency portion of single-pass EMP transient response measurements. Improvements of 12 dB and mo...

The electromagnetic environment near lightning and thunderstorms and the induced effects of this environment on aircraft wiring was measured as part of Project Thunderstorm (TRIP-76). Instrumentation consisted of an externally mounted transient electric f...

We develop and present high order mixed finite element discretizations of the time dependent electromagnetic diffusion equations for solving eddy current problems on 3D unstructured grids. The discretizations are based on high order H(grad), H(curl) and H(div) conforming finite element spaces combined with an implicit and unconditionally stable generalized Crank-Nicholson time ...

A new procedure, based on a combined frequency- and time-domain approach, is presented for the transient analysis of dissipative power networks with nonlinear loads described by monotone characteristics. Special care is paid to the solution of the network transient equations in case the line-sections are closed on protective devices such as varistors. ...

In modern dynamics system, the radiant temperature of the flame, which caused by the transient plasma stimulated by high-energy-level electromagnetism field, takes an important role in the description of the flying object's status as well as cauterization of the trajectory. Due to its extremely high temperature and transient process, ...

One of the most serious problems of the KEPCO system is a higher fault current than the CB(Circuit breaker's SCC (Short Circuit Capacity). There are so many alternatives to reduce the higher fault current, such as the isolation of bus ties, enhancement of the CB's SCC, and the application of HVDC-BTB (Back to Back) or FCL (fault current limiter). However, these alternatives have drawbacks from the ...

In January 2003 Transient Luminous Events (TLEs) also known as sprites and ELVES were observed by the astronauts on board of the Columbia space shuttle, during the Mediterranean Israeli Dust Experiment (MEIDEX). Throughout the 16-day mission, electromagnetic data at four ground-based Extremely Low Frequency (ELF) stations (Israel, Hungary, Japan and ...

A measuring system is described for surveying and very accurately positioning objects with respect to a reference line. A principle use of this surveying system is for accurately aligning the electromagnets which direct a particle beam emitted from a part...

Valves are commonly used in fluid power systems to control pressure and flow. The emerging field of digital hydraulics demands high-speed, low cost, on/off valves with improved performance. Electromagnets, or solenoids, are commonly used to actuate valves due to their low cost, high reliability, and moderate performance. This work develops a dynamic model for a solid steel ...

The goal of this project is to accurately predict the high altitude wave energy generated by low altitude VLF sources. We applied full-wave finite difference numerical models of the electromagnetic fields in both time and frequency domain to compute the V...

IZM Series Electromagnetic Flowmeter Software Version 2.2 Accurate Metering Systems, Schaumburg, IL. ... IZM Series Electromagnetic Flowmeter Software Version 2.2. ...

Electromagnetic finite element analysis was used to model the 2D instantaneous heating effects under a Bath University MEGA electromagnetic FE program. A full 3D coupled electromagnetic heating model based on the MEGA electromagnetic finite element code is described.

A complete, three phase transformer model for the calculation of electromagnetic transients is presented. The model consists of a set of state equations solved with the trapezoidal rule of integration in order to obtain an equivalent Norton circuit at the transformer terminals. Thus the transformer model can be easily interfaced with an ...

To facilitate the research in highly compact capacitive energy storage devices for fieldable electromagnetic launchers and other pulsed power systems, the author developed and implemented a numerical formulation to analyze the transient electromagnetic fields for the general class of electro -quasi-static (EQS) systems in an unbounded ...

Induction motors form a considerable portion of industrial loads; hence, the analysis of their performance is often required in system studies. The analysis is either concerned with steady-state performance, or with transient performance during start-up and during system disturbances. The Electromagnetic Transients Program (EMTP) is ...

The techniques developed for the numerical simulation of plasmas have numerous applications relevant to accelerators. The operation of many accelerator components involves transients, interactions between beams and rf fields, and internal plasma oscillations. These effects produce non-linear behavior which can be represented accurately by particle in cell ...

... material is fired through a hot plasma at high ... the plasma allows accurate determination of the magnetic ... In hotter plasmas the probe can be encased ...

Magnetic Forming Studies. The use of transient high magnetic-field devices has made possible the generation of very large accurately ...

Results 211 - 220 ... Operating alongside with PITEX monitors, BEAM can assist with accurately identifying the boundaries and anomalies of transient periods. ...

Results 201 - 210 ... Operating alongside with PITEX monitors, BEAM can assist with accurately identifying the boundaries and anomalies of transient periods. ...

Results 151 - 160 ... Operating alongside with PITEX monitors, BEAM can assist with accurately identifying the boundaries and anomalies of transient periods. ...

In modern high-energy physics, a powerful electromagnetic field must be supplied for some elementary particles to be accelerated by passing through the region of high-energy physics fields. The electric current and high voltage producing the powerful electromagnetic field are very important to high-energy accelerators, but the insulation of ...

We have used the 2-D PIC code, GYMNOS, to study the transient behaviors in the Heavy Ion Fusion (HIF) injectors. GYMNOS simulations accurately provide the steady state Child-Langmuir current and the beam transient behavior within a planar diode. The simul...

Systems transient-analysis codes can be expected to yield reasonably accurate results (order +-20% or so on system pressure) if carefully utilized and if the two-phase and transient-flow conditions are not severe. As the severity of the transient increase...

Power system simulations are roughly classified into the two categories, effective-value-based simulations and electromagnetic transient simulations. The former are usually long-term simulations of a large power system considering the electro-mechanical dynamics and include for instance transient stability simulations. On the other ...

Transient electromagnetic method (TEM) has been widely used in the ground source exploration (Gunderson et al, 1986), ground target mapping (Cheesann et al, 1987; Xue et al, 2004 and 2010), and tunnel prediction (Xue et al, 2007). However, with the rapid development of engineering construction of mainland China, the precision involved in TEM prospecting is ...

A rigorous solution for transient propagation of electromagnetic waves through a medium has been found. Because of this rigorousness, the solution exhibits apparent consistency with Einsteinian causality. Thus, it is confirmed that faster-than-light or superluminal propagation of electromagnetic waves is not possible. Evanescent ...

The authors construct a mathematical model, using the terminology of quantum mechanics and magnetic resonance, of the transient effects in the parametric excitation of system of particles with spin in a constant electromagnetic field in the laboratory-coordinate system. Their Hamiltonian describes the interaction of particles with a sequence of pulsed ...

Results are reported of a project designed to reduce the magnitude of transient high-frequency electromagnetic field disturbances near 230-kV line disconnect switches by structural shielding. A reduction in peak transient electric fields from 600 volts per meter to an equipment specification value of 1 volt per meter at the site of a ...

Response of a Tall Object to Lightning Vladimir A. Rakov Abstract--Experimental data showing the transient behavior of tall objects struck by lightning are reviewed. The influence of this transient behavior, illustrated by simple calculations, on measured lightning current and measured remote electromagnetic fields

The transient electromagnetic method (TEM) is widely used in mineral and oil exploration as well as water exploration, engineering and environment geophysics exploration. Numerical modeling for transient electromagnetic responses of a 3-D source over 2-D geoelectric model is so-called 2.5-D problem, in which the ...

The motion or, generally, the deformation of an electromagnetic medium makes it numerically difficult to implement the electromagnetic field boundary conditions and hence solve the conventional set of Maxwell's equations. The difficulty lies in the fact that the domain of solution and its boundary can be significantly distorted. A Lagrangian ...

Existing second order accurate finite difference methods have been evaluated for application to finite deformation transient dynamic response problems in solids. A new second order accurate finite difference technique has been developed. This is a two-ste...

With the emergence of advanced propulsion systems such as liquid propellant (LP), electrothermal-chemical (ETC), electromagnetic (EM), conventional hypervelocity, and in-bore ramjet, the measurement of combustion phenomena has become more complex. The data associated with these systems can be rich in high-frequency components, and share similar transient ...

The properties of electric and magnetic probes for the measurement of transient electromagnetic fields in air and in dissipative media are discussed briefly, It is shown that the effective height of an electrically small loop is independent of the ambient medium. This is also virtually true for a thin electrically short dipole (or monopole). If ...

A prototype active electromagnetic system has been developed for detecting and characterizing UXO. The system employs two orthogonal vertical loop transmitters and a pair of horizontal loop transmitters spaced apart vertically by 0.7 m. Eight vertical field detectors are deployed in the plane of each of the horizontal loops and are arranged to measure offset vertical gradients ...

Compton electrons generated in air by gamma rays produced by nuclear explosions are known to cause transient electromagnetic fields called the electromagnetic pulse (EMP) or radioflash. The average forward range of the Compton electrons in air is a princi...

We present a highly simplified model of an electromagnetic rail gun. The energy source for the gun consists of a rotating magnetic dipole moment positioned at the center of a stator coil. The dipole moment is free to rotate about an axis normal to the sta...

Analysis of source-excited time-harmonic and transient electromagnetic wave propagation in complicated environments, wave scattering by complicated targets, or wave penetration into complex structures generally requires decomposition of the incident field...

A nuclear detonation in or above the earth's atmosphere produces an intense electromagnetic pulse (EMP). A large portion of the EMP electromagnetic energy is within the RF spectrum. A detonation at high altitudes above 40 km produces an EMP called high-al...

An assessment of the susceptibility of protective relays to the transients produced by high-altitude electromagnetic pulse (HEMP) events is presented in this paper. Several mechanisms responsible for coupling of HEMP to relay terminals are examined. The p...

We survey the phenomenon of pair production by the transient electromagnetic fields produced in relativistic heavy-ion collisions, as it impinges upon atomic, nuclear, and particle physics, and the design of accelerators and detectors. The subject is natu...

The electromagnetic pulse (EMP), one of the effects of the detonation of a nuclear weapon, consists of a transient wave of intense electric and magnetic fields. These intense fields can cause malfunction or damage to electrical and electronic equipment ex...

The application of filters for the protection of electrical equipment from electrical transient signals induced by high-altitude electromagnetic pulse (HEMP) is discussed, and the application of filters to ac and dc power supplies and analog and digital s...

To survive the intense electromagnetic fields associated with a lightning strike, proper design of aircraft electrical control systems requires knowledge of the transient current pulse associated with a lightning strike. This report summarizes in-house te...

This research investigates the possibility of applying exponentially curved conducting plates to single-element Transverse Electromagnetic (TEM) horns and their transient arrays to enhance the UWB characteristics already experienced by these radiators. Th...

The objective of this study was to determine the effects of lightning on solar photovoltaic systems in the 100 kilowatt to 1 Megawatt power range, and to determine methods for protecting these systems from lightning. The photovoltaic systems and their lig...

The Long Arc Lightning Simulator is part of the Electromagnetic Transient TE Facility (EMTEF), located at Patuxent River, Md. The Long Arc Simulator is operated by the EM Transient's Branch of the E3 division and is part of the DOD Major Range Test Facili...

We present consistent transient theory of lasing without inversion and show by numerical analysis that pulse-mode lasing is feasible in a two-level system with split upper levels coupled by an external high-frequency electromagnetic field.

Lower-bound estimates are obtained for the error of measurement of the parameters induced in a vibratory system with electromagnetic energy conversion in the transient regime. These estimates can be used to determine the possible reserves for increasing the accuracy (or resolving power) of devices for the nondestructive monitoring of materials and ...

The effect of the components of a transient suppressor on the protective function, of the device were studied. Measurements show that the operation of the gas tubes requires low inductive connectors. An injected pulse with a rate of rise of 20 A/nsec ligh...

This brief is a tutorial introduction to transient electromagnetics, focusing on direct time-domain techniques. Physical, mathematical, and numerical aspects of time-domain methods are examined, with emphasis on wire objects excited as antennas or scatter...

It is well known that one of the main advantages of the high speed forming (HSF) processes is the improvement in the forming limits of the used materials. Using the Electromagnetic Forming (EMF) technology two materials have been tested with different mechanical and physical properties: the AA5754 aluminium and the AZ31B magnesium alloys. The EMF process principle can be ...

It is well known that one of the main advantages of the high speed forming (HSF) processes is the improvement in the forming limits of the used materials.Using the Electromagnetic Forming (EMF) technology two materials have been tested with different mechanical and physical properties: the AA5754 aluminium and the AZ31B magnesium alloys.The EMF process principle can be ...

An interpretation based on the Continuous Time Random Walk theory (CTRW) to the diffusion of electromagnetic fields generated by a transient straight current source over a porous geological media is presented here. The CTRW theory is demonstrated to be a powerful tool to concisely and more accurately model a transport process in a ...

Transient Waveform Control of Electromagnetic Test Equipment .... is only the identity of the pair of regions characterized by the smallest measure of dissimilarity. ... sensitivity of magnetism have been under development for hide ...

Electromagnetic pulses from nuclear weapons, lightning, and electrostatic discharge are three examples of electrical overstress. Such overstress can cause failure, permanent degradation, or temporary malfunction (upset) of electronic devices and systems. ...

... sources of electromagnetic energy to model the VLSI chip. ... Because the effects of diffraction during proximity-print x-ray lithography are of ',' MIC ...

... US Government Printing Office, Washington, DC, 1076. Morrison, HF, RJ Phillips, and DP O'Brien, Quantitative interpretation of transient ...

... models of the transient 3D, fully coupled ... SAPIV-A Structural Analysis Program for ... Response of Linear Systems." Earthquake Engineering Research ...

outside the borehole. The borehole must be cased with non-conducting material such as PVC. Induction logs provide very detailed resistivity-depth information within the vicinity...

The purpose of this study is to systematically identify and analyze the safety risks associated with the operation of the Naval Ordnance Transient Electromagnetic Simulator (NOTES) in Pumpkin Neck, Virginia. NOTES initiates an extremely short duration ele...

The study of the EMP phenomenon has promoted the development of techniques to investigate transient electromagnetic response data. Characterization of the EMP transient response information is necessary to evaluate the performance of that system in a hostile environment. An efficient technique to characterize this performance is to fit ...

. Pozar, Microwave Engineering, Wiley #12;14 February 2003 30 Basic System Architecture � System architecture

Subject Terms: CONFERENCES; DIGITAL COMPUTERS; ELECTROMAGNETISM; ELECTRONIC EQUIPMENT; FOURIER TRANSFORMATION; REAL TIME OPERATION; WAVEFORMS ...

TO 1 .O AMPERE WITH INTERNAL DIODE FOR COIL TRANSIENT .... semiconductors shall be in accordance with MIL-STD-750, method 2073 or 2074. ...

... from Noisy Transient Electromagnetic Measurement," Lawrence Livermore Laboratory, Submitted for Nuclear E Meeting, Anaheim, California, 5-7 ...

... surfaces residing in an unbounded homogenous medium. ... of the three- dimensional (3D) transient fields in terms of propagating plane waves. ...

... Volume III (1298 pages) contains the raw test data in the form of oscilloscope photographs attached dto the test data sheets for both test programs ...

The radiated fields of an electromagnetic pulse (EMP) simulator are of interest for various reasons, the most obvious being that of surveillance. The thesis represents the first in a group of proposed studies that will estimate the radiated fields of vari...

... 9 NFPA document #77, "Static Electricity 1977," states in ... Electromagnetic Pulse (EMP) Induced Transients." Harry Diamond Laboratories Report No ...

T. Kashiwa,. N. Yoshida, and I. Fukai,. "Transient analysis of a magnetized plasma in three-dimensional space,". IEEE. Trans. Antennas. Propag. ...

As the information society progresses, a variety of electronic appliances have come into wide use in common houses. If a lightning stroke causes faults or incorrect operations of these electronic appliances, a social economic loss is considered to be large. For this reason, the focus of lightning protection measures for distribution lines in Japan has expanded to include the low-voltage side of ...

An accurate analytical approximation to the capacitance transient amplitude measured by deep level transient spectroscopy as a function of the filling pulse duration is derived. The equation includes the influence of a defect concentration profile and the nonexponential trapping in the Debye tail of the depletion region. Because this ...

This paper describes the characteristics of synchronous machines� damper circuit on transient condition. The authors analyze load rejection case and starting condition in point of the transient reactance saturation by finite element method (FEM) and simulation using the electromagnetic transients program ...

This paper reports on a simulation of a MHO distance relay developed to study the effect of its operation under various system conditions. Simulation is accomplished using a state space approach and a modeling technique using ElectroMagnetic Transient Program (Transient Analysis of Control Systems). Furthermore, simulation results are ...

A state-of-the art review of literature pertinent to fluid transients (water hammer) was undertaken for the Nuclear Regulatory Commission. This review is part of the ongoing water hammer studies being performed by EG and G Idaho, Inc., to further the understanding of the water hammer phenomenon, to more accurately identify its causes and to more ...

Engineering transient analysis codes, which are in general more accurate than the present generation of simulator software, can be expected to yield reasonably accurate results (+-20% or so on system pressure) if carefully utilized and if the two-phase and transient flow conditions are not severe. As the severity ...

It is shown that the standard reduced order model of the induction machine, as it is incorporated into transient stability programs, cannot be used to predict accurately the terminal voltage of large horsepower induction machines during isolated operation. It is further shown that by proper application of the theory of neglecting electric ...

We analyze the scattering of a planar monochromatic electromagnetic wave incident upon a Schwarzschild black hole. We obtain accurate numerical results from the partial wave method for the electromagnetic scattering cross section and show that they are in excellent agreement with analytical approximations. The scattering of ...

The article discusses electromagnetic processes occurring in ac/dc power converters. The study is based on a general equation which describes both transient and steady-state processes. In terms of symmetric transient processes, (1) calculations are made for the current at the beginning of the n-th repetition period, (2) an equivalent ...

It is vitally important to accurately measure the field components of a simulated electromagnetic pulse (EMP), to determine both the waveshape and the amplitude of the electromagnetic test environment. A parallel plate transmission line is used to calibra...

An accurate determination of the electromagnetic scattering cross section of many realistic targets must account for their being multi-dimensional and penetrable by the incident EM wave. An existing volume integral equation formulation of EM fields within...

We calculate explicitely the electromagnetic mass splittings induced within the ground state baryons by the mass difference between the u and d quarks. This is performed in the framework of the non-relativistic potential model with an accurate treatment o...

An efficient method for evaluating the effects of stressful electromagnetic (EM) environments on complex systems has been developed. Using failure information about the system components, the new method accurately and reliably computes the overall respons...

It is shown experimentally that the for of the electromagnetic cascade in Pb ionization calorimeters is changed with the angle of incidence. Af a collinear bean of particles passes through the chamber, its behavior is accurate up to an angle of 60 deg . (tr-auth)

Being able to accurately determine the response of an electrical system which is excited by a high altitude nuclear electromagnetic pulse (EMP) requires a knowledge of the time history of the incident EMP field strength, as well as its angle of incidence ...

One of the primary goals is to develop an approximate but sufficiently accurate analysis for the problem of electromagnetic (EM) plane wave scattering by an open ended, perfectly-conducting, semi-infinite hollow circular waveguide (or duct) with a thin, u...

The recent advances in computer technology and associated software have introduced new concepts and techniques into the traditional classroom environment of engineering education. WEMAP, an electromagnetic analysis computer code, is a part of a new breed of computer aided engineering tools for teaching electromagnetics to power engineering students. WEMAP ...

This paper deals with the rare high intensity electromagnetic pulses associated with earthquakes, whose spectrum signature differs from that of atmospherics produced by lightning discharges. On the basis of actual data records, cases of the generation of anomalous seismo-electromagnetic emissions are described. These natural sub-millisecond ...

Lately, there has been a mounting concern about the electromagnetic compatibility of nuclear-power-plant systems mainly because of the effects due to the nuclear electromagnetic pulse, and also because of the introduction of more-sophisticated and, therefore, more-susceptible solid-state devices into the plants. Questions have been raised about the ...

Random impulse voltage transients that occur on electrical power distribution systems can cause physical damage to critical loads, resulting in operational failure. There are numerous transient detection devices, but until recently no device could determine the direction of propagation of transients on a powerline. This report is an ...

We study the possible mechanism of the separatrix destruction during the transient in the linear accelerator. This effect is due to the parametric resonance of the beam in the longitudinal plane caused by the perturbations of electromagnetic field. The magnitude of time-space perturbations of the electromagnetic field depends on the ...

A method of evaluating test effects upon electromagnetic relays through the analysis of their transient response by means of generalized operate and release curves is presented. The curves are developed and units of measure discussed. Effects of circuit parameters, manufacturing tolerances, and stability of adjustment are examined in terms of the ...

The high-altitude detonation of a nuclear device over the continental United States can expose electric utility power systems to intense, transient electromagnetic pulses (EMP). In addition to the initial transient fields designated as early-time, high-al...

This report describes a Fast-Turnoff Transient Electromagnetic (TEM) study at the Pe�a de Hierro ("Berg of Iron") field area of the Mars Analog Research and Technology Experiment (MARTE), near the towns Rio Tinto and Nerva, Andalucia region, Spain.

A ground transient electromagnetic sounding method was evaluated for the detection of salt water-fresh water interfaces along the Gulf Coast of Florida. Seventy-nine soundings were completed utilizing either 80 x 80 meter or 160 x 160 meter horizontal tra...

This document is an outgrowth of a survey and analysis of Electromagnetic Transients Program (EMTP) user needs, in which improved user's documentation was determined to be the single most important enhancement to the EMTP. The Application Guide covers EMTP models and studies, with many examples and typical data. The Application Guide is part of a ...

This document is an outgrowth of a survey and analysis of Electromagnetic Transients Program (EMTP) user needs, in which improved user's documentation was determined to by the single most important enhancement to the EMTP. The Primer is an EMTP training manual for new users. It includes introductory material and eleven sample studies so that the ...

The practical use of the TEM sensing method in China and India is described. In this electromagnetic process, the electrical resistance and the thickness of geological structures can be measured with high accuracy down to great depths. As geophysical stan...

An analytical study and EMTP (ElectroMagnetic Transient Program) implementation for calculation of overvoltages in three-phase inductive circuits are compared. Capacitive and/or inductive couplings between phases are included in schemes with grounded and ...

. Power system models are mainly developed using electromagnetic transients program (EMTP) while relay, October 2005. [5] T. S. Sidhu, "Relay software models for use with electromagnetic transient analysis for automated analysis of protective relay operations. For each environment, the test requirements, test

The investigation of the stationary condition of a laser is approached by considering the state of the electromagnetic field as a collection of accurate normal oscillations. Solutions of Maxwell equations with approximate boundary conditions correspond to...

The paper presents a survey of improved measurement techniques, instrumentation, and data presentation for accurate, meaningful evaluation of electromagnetic compatibility (EMC) of electronic systems and sub-systems. These techniques and instrumentation w...

... of the formulation are general and can be used with any computational kernel. ... 31) have been computed, we have available at every point in space ...

Accurate and rapid evaluation of radar signature for alternative aircraft/store configurations would

... gyro, a Microstrain 3DM electromagnetic compass, and ... to be a comprehensive guide to Kalman Filtering. ... unfamiliar with the Kalman Filter and it's ...

... Figure 8. Comparisons of LWPC and FDTD predictions of low altitude 25.2 kHz vertical electric fields as a function of range from the transmitter. ...

... altitudes are resolved coarsely and only the highest altitudes are resolved finely, is the key to achieving efficient simulations of high-altitude fields. ...