Apparatus and method for transmitting dc power to a load circuit by applying a dc voltage from a standard waveform synthesizer to duration modulate a bipolar rectangular wave generator. As the amplitude of the dc voltage increases, the widths of the rectangular wave generator output pulses increase, and as the ...

... Accession Number : AD0610717. Title : MODES IN A RECTANGULAR WAVE-GUIDE FILLED WITH AN ANISOTROPIC DIELECTRIC,. ...

The possibility of the application of tensametry for the determination of surfactants was examined. The behavior of several auxiliary materials in the plastics industry using ac polarography (alternating current polarography) was studied. Surface active material tensides were determined by classical polarography (dc polarography) indirectly on the basis of the drop in the ...

... In this paper, the microwave processing of semicrystalline polymers such as ... wave cavity and a rectangular standing wave applicator is described. ...

Page 1. The analysis of transient scattering for rectangular incident waves using the discrete Laguerre transforms Mengtao ...

We re-examined the angular dependence of the radiation from the intrinsic Josephson junctions in rectangular mesas of Bi2Sr2CaCu2O8 + ?, in order to determine if the cavity mode part of the radiation arises from waves across the width w or along the length \\ell of the mesas, associated with 'hot spots' (Wang et al 2010 Phys. Rev. Lett. 105 057002). We ...

We re-examined the angular dependence of the radiation from the intrinsic Josephson junctions in rectangular mesas of Bi(2)Sr(2)CaCu(2)O(8 + ?), in order to determine if the cavity mode part of the radiation arises from waves across the width w or along the length [Formula: see text] of the mesas, associated with 'hot spots' (Wang et al 2010 Phys. Rev. ...

... Accession Number : ADA040148. Title : Wave Motion in Low-Pressure- Ratio Rectangular and Pyramidal Shock Tubes,. ...

... Accession Number : AD0630775. Title : NON-LINEAR STANDING WAVES IN A RECTANGULAR TANK DUE TO FORCED OSCILLATION. ...

... Accession Number : ADA098064. Title : Finite-Amplitude Standing Waves in a Rectangular Cavity with Wedge-Type Boundary Perturbation. ...

such a structure is by combining rectangular patches as in a patchwork quilt. To ac- complish this we have de#12;ned

This paper describes how to generate the vibration of IPMC effectively. First, it was found that IPMC generates large spiky deformation by applying long-term period saw-tooth wave voltage. The deformation quantity is increased with the longer period saw-tooth wave. Vibration with the proportional control was also investigated. IPMC cannot control its ...

... It was found that in a rectangular basin, absorbers reduce the effects of the radiated wave energy and a filter minimizes longitudinal resonant effects ...

... Title : Nonlinear Interaction of Two Noncollinear Sound Waves in a Rectangular Waveguide. Descriptive Note : Technical rept.,. ...

... Abstract : The authors have recently reported the observation of magnetostatic surface waves (MSSW's) in a rectangular YIG (Yttrium Iron Garnet ...

... Accession Number : ADD426014. Title : A Mixture Theory for Longitudinal Waves in Materials Reinforced by Rectangular Fiber Arrays,. ...

New compound CaFe4As3 crystallizes in an orthorhombic structure with Fe2As2 layers aligned along b direction but a rectangular cross-section in ac plane. The needle-shaped CaFe4As3 single crystals were grown and are found to undergo two successive phase transitions occurring at T1� 90 K and T2� 27 K, respectively. At T1 the electrical resistivity ...

... _, real permeability &, electric loss tangent tan 5 and mag- netic loss tangent tan b'. If the slab is centered in a rectangular wave- guide as shown in ...

The basics of wave phenomena in waveguides with rectangular cross section which are filled with dispersive materials are studied in this report. The purpose is to apply the recently introduced method, which is suitable to use in different applications of ...

Rectangular waveguide is commonly used up to high millimeter-wave frequencies. However, conventional

An analysis is presented for the propagation of water waves past a rectangular submarine trench. Two-dimensional, linearized potential flow is assumed. The fluid domain is divided into two regions along the mouth of the trench. Solutions in each region ar...

This paper is a four part dialectic between theory and experimental observations and measurements of two dimensional periodic surface waves in a vessel of rectangular cross section. The first two parts consist of minor contributions to the existing theory...

The objective of this investigation is to study magnetostatic-wave propagation in a rectangular waveguide loaded with a finite YIG slab, to understand the effect of physical parameters on the dispersion and group time-delay characteristics, and to obtain ...

Finite amplitude acoustic standing waves in a rectangular airfilled cavity with various wedge-shape boundary perturbations were studied both experimentally and theoretically. The experimental results showed that geometrical perturbations alter the finite ...

The theory of acoustic plane waves incident on an oblique clamped panel in a rectangular duct was developed from basic theoretical concepts. The coupling theory between the elastic vibrations of the panel (plate) and the oblique incident acoustic plane wa...

In this paper, the scattered far-field pattern of a perfectly conducting rectangular cylinder illuminated by a plane H-wave is obtained by a modified form of GTD approximation and the result is subsequently improved in a straightforward manner by eliminat...

... of complex waves with propagation constants ± y,, and ± yV ... SOME POINTS OF THEORY The rectangular waveguide of a x b cross ...

... DoD) Issuances (current and cancelled ... OF CLASSICAL EDDY CURRENTS IN RECTANGULAR ... IDEALIZED HALF-WAVE MAGNETIC AMPLIFIERS. ...

... the results computed by the model. ... A, and is the incident traveling wave current for elements ... modes that are used to analyze the proximity coupled ...

... This was followed by a review of the literature on rectangular and circular wave guide with two objectives in mind: 1) To find ways of computing the ...

The plane wave propagation, the stability, and the rectangular duct mode problems of a compressible,

The a-c induction MHD generator with a channel of rectangular cross section and a polyphase winding as a source of the traveling wave of magnetic field of any arbitrary but finite length is treated as a boundary value problem. The solutions obtained indicate that the appropriate parameter that could be treated as a figure of ...

A rigorous solution is obtained to the problem of the scattering of H(10) waves by a complex capacitative inhomogeneity in the form of an open cylinder with longitudinal slot situated inside a rectangular waveguide. The solution is obtained by a semi-inversion method originally developed for the analysis of plane wave diffraction on an ...

25 products ... Waksman (1970) (b ? 1)(ac + a + c ? 1)/2 + ac. Previous work. Probert and Fischer (1980): square sizes up to 40. Smith (2002): rectangular sizes up ...

sional wave equation of mathematical physics. As a result ...... The derivation here follows the approach of Prandtl (reference 2). Rectangular plan form. ...

... Accession Number : ADA066356. Title : Theoretical Study of Finite Amplitude Standing Waves in Rectangular Cavities with Perturbed Boundaries. ...

via coaxial cables or rectangular waveguide. ..... Precision Coaxial Cables and Connectors Reach 45 GHZ. Micro- waves RF , vol . 22, no. ...

... Rectangular Wave Guide E2 TEIO mode P =Eab ... Stechniques such as the variable-couplding ring resonator, along with tapered I wave guide. ...

... distribution is reminiscent of that of the TE10 mode in rectangular wave- guide, in which the electric field is vertical, and the variation h 'izon- ...

... Abstract : Finite-amplitude standing waves in air at ambient temperatures contained within a detunable, rigid-walled rectangular cavity were ...

... ADA064864. Title : Experimental Study of Finite-Amplitude Standing Waves in Rectangular Cavities with Perturbed Boundaries. ...

The study investigates the propagation of electromagnetic waves in a rectangular waveguide which contains a periodically varying unidirectionally inhomogeneous medium. Variations of both permittivity and permeability in the direction of propagation are co...

... INTRODUCTION 1.1 The Tube A rectangular wave guide is used in the TE/0 mode. ... up by the cathode. The opposite edge of the wave guide ...

Based on a capacitively coupled electrical discharge scheme, it is demonstrated that an array of plasma torches can be lit up simultaneously to form a dense plasma layer in the open air by a single ac power source. The number of torches is only limited by the power handling capability of the source. The measured v-i characteristic of the discharge indicates that the torch is ...

Apparatus for conditioning power generated by an energy source includes an inverter for converting a DC input voltage from the energy source to a square wave AC output voltage, and a converter for converting the AC output voltage from the inverter to a sine wave AC output voltage.

Alfven has postulated the existence of hydromagnetic waves to explain certain sunspot phenomena. An experiment is described in which an effort was made to generate and detect such waves. (A.C.)

The dependence of the single bubble sonoluminescence (SBSL) on the waveforms of the driving ultrasound has been investigated by both experiment and numerical calculation. Three types of non-simple-harmonic waves, the rectangular, triangular and as well as the sinusoidal wave with a pulse, are used to drive the SBSL in our research. The ...

Quasi-resonant converters are a family of single-switch resonant dc-dc converters featuring zero-current or zero-voltage switching. The topological structure uniting these resonant converters - and the rectangular-wave (PWM) converters on which they are based - leads to general models of their dc and low-frequency ac behavior. An expression is derived that ...

The present work may be considered to be a continuation of an earlier investigation related to forced oscillation tests with a rectangular and triangular cylinder to measure the hydrodynamic coefficients and added resistance for two speeds of advance. For...

Condensation heat transfer in an annular flow regime with and without interfacial waves was experimentally investigated. The study included measurements of heat transfer rate with condensation of vapor flowing inside a horizontal rectangular duct and expe...

During the period of the AASERT the graduate student completed experiments and a Ph. D. dissertation on microwave emission of large and small or it rectangular cross section (RCS) gyrotron devices. Rectangular interaction cavities with both small orbit an...

Aug 6, 2010 ... These devices have primarily been rectangular coaxial transmission lines, although rectangular waveguide and other structures have also been ...

Problems of scattering and radiation of water waves by rectangular or circular bodies are formulated within the framework of linearized potential theory. The objective is to find the far field wave amplitude due to radiation by a body oscillating in a pre...

An analytical description of earthquake generated waves in protected artificial basins is presented. Linearized, inviscid, irrotational surface gravity wave theory is applied to basins of uniform depth with vertical boundaries. Numerical solutions are presented for closed rectangular and circular basins and open ...

We investigate the wave packet dynamics of an electron restricted to a periodic one-dimensional lattice and driven by an external field having both DC and AC components. We show that when the frequency of the AC field is a multiple of the frequency of the usual Bloch oscillations, a directed motion of the wave ...

... However, wave- guide slottet' lines were available which ... ch alternate about the waveguide center-line ... ments is the slotted line technique described ...

... order modes of a rectangular duct," J. Acoust. ... of the University's graduate acoustics program. ... Refraction of Finite Amplitude 0574 Acoustic Waves at ...

Aug 3, 2009 ... Air-filled copper rectangular coaxial transmission lines are fabricated using ... The resulting transmission lines are extremely broadband, ...

Electromagnetic Plane Wave Scattering by Perfectly Conducting. Semi-infinite Parallel Plate and Rectangular Waveguides with. Absorber Coated lnner Walls," ...

With sufficient immersion of the paddles intense jet mixing occurred and large flapping wave motion was observed using a stobed focused Schlieren system. ...

May 31, 2011 ... With sufficient immersion of the paddles intense jet mixing occurred and large flapping wave motion was observed using a stobed focused ...

... The slotted gyro-BWO interaction tube has ... the input fundamental rectangular waveguide is wrapped ... with approximately six holes coupling the two ...

... coefficients of rectangular slots, dumbbell slots, and various slot combinations which couple a coaxial-line to a side waveguide, are determined. ...

The analysis of waves in bends in acoustical ducting of rectangular cross section was extended to the study of motion near discontinuities. This included determination of the characteristics of the tangential and radial components of the nonpropagating mo...

... W_-.a shows that if the fundamental mode in a rectangular wave guide undergoes a phase shift 2Awhen it encounters a sloping shorted end, each ...

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 ac field ...

... DC polarographic maxima on AC wave; Electrochemical reduction of ... electrolytic bubbles:--Bubble departure diameters; Proton NMR and electronic ...

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

... Using the method of singular perturbations I ... Implementation of an Impedance Boundary Condition ... of Engineering Mathematics, ac- cepted, August ...

... DIRECT CURRENT, LOW VOLTAGE, AUTOMOTIVE VEHICLES, SINE WAVES, ELECTRONIC COMMUTATORS, MAGNETIC CIRCUITS. ...

... DETECTION OF CORROSION IN ALUMINUM SUBSTRATE (Preprint) AC Ryley, MT Ghasr, S. Kharkovsky, R. Zoughi, and Gary Steffes ...

A linear theory for a rectangular waveguide cyclotron maser with a sheet electron beam is developed by using the Laplace transformation approach. This theory can be applied to any TEmn rectangular waveguide mode. The corresponding equations for the TMmn mode in the rectangular waveguide are also derived as a useful reference. ...

Experiments are described on the excitation of compression waves in plasmas by transient phenomena such as shocks and arcs or by hydromagnetic instabilities. The possibility of powering them from an external source is suggested. (A.C.)

A method is developed and validated for calculating the wave resistance of an overhead line with dropped middle phase; it is of interest in new versions of extra- and ultrahigh-voltage ac lines.

An empirical relation is presented which allows simple computation of volume-averaged winding fields from central fields for coils of small rectangular cross sections. This relation suggests that, in certain applications, ac-loss minimization can be accomplished by use of low winding densities, provided that hysteresis losses are independent of winding ...

A new type of printed rectangular helix slow-wave structure (SWS) is investigated using the field-matching method and the electromagnetic integral equations at the boundaries. The radio-frequency characteristics including the dispersion equation and the coupling impedance for transverse antisymmetric (odd) modes of this structure are analysed. The ...

Magnetization AC losses in striated YBCO conductors in a perpendicular applied AC magnetic field were investigated with special regard to the coupling current AC loss (CCAC). The AC loss of YBCO samples of different length L was measured by using rectangular-shaped pick-up coils. The ...

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 can be provided by a superconducting ...

A software package has been developed to solve the elastic wave equation by the method of finite differences. The elastic wave equation can be solved in two dimensions for point sources in cylindrical coordinates or line sources in rectangular coordinates...

Slow wave cyclotron instability in dielectric loaded waveguides driven by an anisotropic velocity distribution is considered. The spatial growth rate of the radiation field is calculated by deriving a dispersion relation of the waveguide modes in the pres...

This is an analysis of three dimensional surface waves which occur in a vessel of rectangular cross section and finite depth. The linearized problem has double eigenvalues for particular combinations of the parameters. It is shown that eight solution bran...

Discussed is the development of design data and strategies for optimizing the performance of wave energy generators. Rectangular buoys are considered for illustration. The buoy dimensions necessary for maximizing the conversion efficiency while minimizing its size for a particular ocean condition are evaluated. 12 refs.

Two computer programs are presented for closed rectangular buildings and open frame buildings to determine the loading of these buildings caused by the shock wave of a nuclear explosion. The input values are the distance to the explosion center, the explo...

A new type water-surface-wave soliton, nonpropagating hydrodynamic soliton, has been discovered. This is a self-trapped, highly localized and stationary transverse water-surface-wave excitation which appears in a rectangular cross section resonator contin...

A finite difference formulation is presented for sound propagation in a rectangular two-dimensional duct without steady flow for plane wave input. Before the difference equations are formulated, the governing Helmholtz equation is first transformed to a f...

The propagation of linear, dissipative acoustic Bloch waves in a periodic waveguide is investigated theoretically and experimentally. The waveguide under study is a rigid, fluid-filled, rectangular waveguide that is loaded with a periodic array of rigidly...

The primitive hydrostatic equations for a rectangular homogeneous ocean with a free surface on a beta-plane are integrated numerically for 60 days from an initial state of rest and undisturbed depth of 400 m. A series of transient Rossby waves of approxim...

Wave structure of marginal detonations, propagated through nitrogen-diluted stoichiometric hydrogen-oxygen mixtures in a 1-3/4 in. by 3/4 in. rectangular tube, is studied by the soot technique and velocity probes. Both weak shocks and strong detonations a...

So far, we have measured angular dependence of the intensity of the THz emission from mesas of high-Tc superconductor Bi2Sr2CaCu2O8+? with various shapes such as rectangulars, squares, cylinders, triangulars, etc. and various dimensions larger or smaller than the penetration depth ?c. The results have been analized by a model developed by Klemm and Kadowaki ootnotetextRichard ...

Since 1970 at least 12 men have died from underground coal-mine fires which were started due to undetected high-resistance faults on trolley systems. Methods which have been proposed to determine these dc fault currents more accurately involve the assumption that the magnitude of the fundamental-component current on the ac side of the rectifier is equal to the magnitude of the ...

A NLS-type equation with an additional term of variable coefficient governing the modulational evolution of standing gravity waves on a water layer with slowly variable depth is obtained by using the multiple scale method to the potential-flow boundary value problem. In this paper a single solitary wave solution of this equation, that corresponds to the ...

This patent relates to wave-guides and in particular describes wave delaying structure located within a wave-guide. The disclosed wave-guide has an elongated fiat metal sheet arranged in a central plane of the guide and formed with a series of transverse inductive slots such that each face presents an ...

Applied electric fields (EFs) have previously been presented as a potential method of inducing functional recovery after neural trauma. To date, most of this research has focused on the application of a direct current (DC) stimulus to produce the desired EF and induce neuronal growth. We propose that high duty-cycle alternating current (AC) stimulation is capable of inducing ...

The intensity distribution of wave field in a perfect crystal of rectangular form is calculated for a very narrow incident wave by numerically solving Takagi�s equations. The result is displayed by the graphics and interpreted in comparison with the analytic solutions of the partial differential equations. Most part of the incident ...

This paper addresses a theoretical study of guided normal waves in elastic isotropic bars of rectangular cross-section by an analytical superposition method. Dispersion properties of propagating and evanescent modes for four families are analyzed in detail at various geometric and physical parameters of the bar. A comparison of the obtained results with ...

The principle of surface wave plasma discharge in a rectangular cavity is introduced and the distribution of the electromagnetic field within a rectangular waveguide is analysed. A novel structure of a slot antenna array is presented. In comparison with the traditional slotantenna, it is shown that the designed slot antenna array can ...

Splitting and RecombiningSplitting and Recombining Atom WavesAtom Waves The Science this empiricalderive this empirical formulaformula Photo from http://www-groups.dcs.st-and.ac.uk/~history/PictDisplay/Planck.html #12;Max PlanckMax Planck Photo from http://www-groups.dcs.st-and.ac.uk/~history

AC Power and Power Factor Correction ECE 2100 Circuit Analysis updated 8 January 2008 Pre. Express your result in rectangular and polar coordinates. 3. Calculate the complex power S of the load (consisting of R1 and L1), the power dissipated by the resistor, and the inductor reactive power. As always

We report an unexpected observation of a transition to traveling waves from standing waves. The waves are two dimensional and generated in a rectangular container excited by a horizontal sinusoidal motion along its length. The transition to traveling waves clearly indicates coupling between ...

A metallic-nanoshelled rectangular dielectric rod is proposed to flexibly enhance and tune the structural absorption. Due to the ultra-small thickness of the metallic-nanoshells, electromagnetic (EM) waves can penetrate into the rods and rectangular cavity resonances can be formed. At the cavity resonances, the strong EM ...

Novel formulations for numerical modelling of elastic waves in block media are developed in this paper. A single differential-difference equation, which can be discretized to give explicit finite difference models of wave propagation in elastic block media, is obtained after incorporating continuity conditions of stresses into the equation of motion. ...

The drift of magnetized particles in a single-mode, low-frequency, electrostatic wave with slowly varying amplitude is analyzed. The distribution of the trapped and untrapped particles is found in a rectangular geometry from the adiabatic invariants of the motion of these particles. The plasma is assumed to be collisionless and to support the single ...

We investigate the water surface waves in a vertically vibrated long rectangular trough with several identical Plexiglas rectangles lined periodically on the bottom. The band structure is computed theoretically by the method of transfer matrix. Some interesting phenomena, such as the localized wave, especially the solitary-like ...

The scattering of Lamb waves by a two-dimensional rectangular notch is investigated for rapid inspection of defects in a structure. To derive the reflection and transmission coefficients of the scattered waves in a simple way, the scattering caused by the notch is analyzed through the composition of individual scattering processes. ...

The problems of application of pulse wave signals in electrical bioimpedance analyzers foreseen for using in implantable medical devices as diagnostical means are discussed in this paper. The main problem arises at measurement of phasor parameters by the aid of rectangular pulse wave signals. The specific measurement errors appear due ...

Shows the elements of an ac series circuit. Demonstrates, by sine waves and circuits, the effects upon and phase relationships between current and voltage. Using a lcr circuit, examines the effects of voltage and shows what the generator sees when xl exce...

Propagating between the contacts of a field-effect transistor (FET), plasma waves in its channel can become unstable and lead to generation of terahertz radiation. While previous studies of this instability concentrated on rectangular FETs, alternative geometries present fresh opportunities. We studied theoretically plasma oscillations in a gated FET with ...

A mathematical model of the propagation of acoustic shear waves in muscle tissue is considered. The muscle is modelled by an incompressible transversely isotropic viscoelastic continuum with quasi-one-dimensional active tension. Two types of shear waves in an infinite medium have been established. The waves of the second type ...