Results 241 to 250 of about 3,299,372 (293)

Age Period Cohort Characteristic Models

Social Science Research, 2000
Abstract Age Period Cohort Characteristic (APCC) models provide a powerful method for testing theories that involve age, period, and cohort effects, but much of that power remains unrecognized. Studies that use this method almost always focus on a single explanatory cohort characteristic and control for only age groups and periods.
Robert M O'brien
openaire   +3 more sources

Periodic characteristics of composite membrane permeability

Journal of Microencapsulation, 1989
The permeability of the microcapsule membrane is one of the important characteristics in evaluating the function of microcapsule. In order to specify the mechanism of the oscillatory permeation of electrolytes through composite membranes, we derived a solution to the equation for the transport phenomena through the membrane composed of different ...
K B, Lee, Y H, Lee
openaire   +2 more sources

Linear propagation characteristics of periodically segmented waveguides

Optics Letters, 1992
Periodically segmented planar waveguides are modeled by using the rigorous modal method of diffraction gratings. The radiation loss, effective index, and electric-field strength distribution are analyzed for different segment duty cycles. It is shown that except for the low radiation loss and possible presence of stop bands, a segmented waveguide ...
L, Li, J J, Burke
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Sensitivity characteristics in nanosized coated long period gratings

Applied Physics Letters, 2006
This work presents an experimental analysis of the sensitivity characteristics to the surrounding refractive index (SRI) in long period gratings coated with polymeric overlay with high refractive index and thickness values ranging in hundreds of nanometers.
Cusano A, Pilla P, IADICICCO, Agostino, CAMPOPIANO, Stefania, Giordano M, Cutolo A.   +5 more
openaire   +7 more sources

Periodic method of characteristics

Journal of Computational Physics, 1973
Abstract A modification to the method of characteristics (MOC) is described for solving a system of two first order hyperbolic partial differential equations possessing periodic solutions. The condition of the physical system is specified by two boundary conditions at a single spatial location.
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Modulation characteristics of periodic moving objects

Proceedings of the 1999 IEEE Radar Conference. Radar into the Next Millennium (Cat. No.99CH36249), 2003
Radar illumination of a rotating object normally yields a modulation of the backscattered signal. Here we analyze this modulation phenomenon of the periodic moving objects in general, and present the modulation feature extraction methods to identify the number of modulation sources in detail.
null Yu Wenxian, null Hu Weidong, null Du Pan, null Yuan Naichang   +3 more
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Characteristics of periodically loaded CPW structures

IEEE Microwave and Guided Wave Letters, 1998
A capacitively loaded coplanar waveguide (CPW) resonator has been studied. It has been shown that the proposed resonator can be used to achieve a slow-wave effect without occupying extra surface area and it has a good performance as compared with the conventional half-wavelength CPW resonator.
Gorur, A, Karpuz, C, Alkan, M
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Guiding characteristics of periodic impedance surface

ICMMT 2000. 2000 2nd International Conference on Microwave and Millimeter Wave Technology Proceedings (Cat. No.00EX364), 2002
In this paper, we present a systematic analysis of the dispersion characteristics of two-dimensionally periodic impedance surfaces. The method of mode matching is employed analyze the boundary-value problem rigorously in terms of the complete set of both TE- and TM-polarized plane waves in the uniform medium above the impedance surface.
R.B. Hwang, S.T. Peng
openaire   +1 more source

Characteristics of resonant periodic orbits

Astrophysics and Space Science, 1982
We study the families of periodic orbits in a time-independent two-dimensional potential field symmetric with respect to both axes. By numerical calculations we find characteristic curves of several families of periodic orbits when the ratio of the unperturbed frequencies isA1/2/B1/2=2/1.
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Characteristics of periodically domain-inverted LiTaO3

Journal of Applied Physics, 1992
A periodically domain-inverted structure in LiTaO3 has been fabricated for quasiphase-matched (QPM) second-harmonic generation (SHG). Uniform proton exchange is achieved with pyrophosphoric acid. Using this technique with a Ta mask followed by heat treatment, the periodically domain-inverted structure for quasiphase matching is realized over large ...
Kiminori Mizuuchi, Kazuhisa Yamamoto
openaire   +1 more source