Results 221 to 230 of about 286,146 (264)

Conversion of voltage-mode biquads to current-mode

38th Midwest Symposium on Circuits and Systems. Proceedings, 2002
A new procedure for obtaining cascadable, opamp based current-mode biquads from voltage-mode biquads without the use of voltage-mode to current-mode transformations is presented. Two new multi opamp biquads circuits are derived and used to construct lowpass, highpass, bandpass, notch, and allpass filters. A single opamp bandpass circuit is also derived.
P.B. Aronhime, Z.J. Lata
openaire   +1 more source

TROLLOPE'S CONVERSATIONAL MODE

English Studies in Africa, 1972
(1972). TROLLOPE'S CONVERSATIONAL MODE. English Studies in Africa: Vol. 15, No. 1, pp. 33-37.
openaire   +1 more source

Mode conversion in the Gulf of Guinea

Journal of Fluid Mechanics, 1999
Linear mode conversion is the partial transfer of wave energy from one wave type (a) to another (b) in a weakly non-uniform background state. For propagation in one dimension (x), the local wavenumber kjx of each wave (j = a, b) varies with x; if these are equal at some xR, the waves are locally in phase, and resonant energy transfer can occur. We
Kaufman, A. N., Morehead, J. J., Brizard, A. J., Tracy, E. R.   +3 more
openaire   +1 more source

Observation of mode conversion in gyrotrons

International Journal of Infrared and Millimeter Waves, 1985
The observed output power levels in the University of Sydney's gyrotron can be accounted for only by including the effects of mode conversion at waveguidetaper transitions in the vicinity of the resonant cavity. A series of measurements taken from liquid-crystal images of the microwave fields beyond the output window confirms this.
G. F. Brand, M. Gross
openaire   +2 more sources

Mode conversion in an imperfect waveguide

Journal of Physics A: Mathematical, Nuclear and General, 1973
A formalism is described for calculating the mode conversion induced in a straight waveguide by imperfections which break its translational symmetry, and in one whose direction changes along its length. The method employs 'quasimodes' which are adapted to the local nature of the guide. The method is particularly useful when the spatial frequency of the
R A Abram, G J Rees
openaire   +1 more source

Mode Conversion in an Inhomogeneous Plasma

The Physics of Fluids, 1972
An expression for the mode conversion efficiency is derived for waves propagating in an inhomogeneous plasma. Special consideration is given to the effects of finite wave vector parallel to a static magnetic field. It is shown that damping results in a reduction of the efficiency in the immediate neighborhood of the conversion layer.
B. N. Moore, M. E. Oakes
openaire   +1 more source

Mode Conversion in Circular Waveguides

Bell System Technical Journal, 1965
Mode conversion from TE 11 to TM 11 modes in circular waveguides is investigated. It is found that an iris placed across the waveguide or an abrupt change in guide radius (step) will produce a wide range of mode conversion coefficients which can be used in most dual-mode feedhorn applications.
E. R. Nagelberg, J. Shefer
openaire   +1 more source

Generation of cylindrical vector modes via astigmatic mode conversion

Optics Letters
In this work, we propose and demonstrate experimentally a compact technique for generating cylindrical vector beams based on a Michelson interferometer and a π-astigmatic mode converter. The latter is required to invert the topological charge of higher-order Laguerre–Gauss (LG) beams.
Tatiana Román-Valenzuela, Valeria Rodríguez-Fajardo, Xiao Bo-hu, Carmelo Rosales-Guzmán   +3 more
openaire   +2 more sources

Normal Modes and Mode Conversion in Helix Waveguide

Bell System Technical Journal, 1961
Helix waveguide, composed of closely wound insulated copper wire covered with an absorptive or reactive jacket, transmits circular electric waves with low loss. Mechanical imperfections, such as curvature and deformation, cause coupling between the circular electric waves and unwanted modes and degrade the transmission.
openaire   +1 more source

Multidimensional autoresonant mode conversion

Physics of Plasmas, 1995
It is shown that the autoresonance effect is characteristic of wave interactions in slowly varying weakly nonlinear multidimensional media. The theory of the phenomenon is presented for the mode conversion case and illustrated in two dimensions. It is demonstrated that multidimensional autoresonance is stable with respect to weak damping and transverse
openaire   +1 more source