Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Amikam Birnboim"'
Publikováno v:
Wood Science and Technology. 40:237-246
A method for calculating the complex dielectric permittivity of an anisotropic wood structure at microwave frequencies is presented. A numerical model for describing the 3D wood structure containing fibers, rays, vessels and cracks with changeable di
Autor:
A. Birman, D. Dadon, Ron Hutcheon, John C. Rodgers, V. E. Semenov, Amikam Birnboim, Jeffery Calame, V. V. Holoptsev, M. Rosen, Yurii Bykov, A. G. Eremeev, Baruch Levush, Yuval Carmel, D. Gershon, Peter L. Martin
Publikováno v:
Journal of the American Ceramic Society. 81:1493-1501
Temperature gradients that develop in ceramic materials during microwave heating are known to be strongly dependent on the applied microwave frequency. To gain a better understanding of this dependence, identical samples of ZnO powder compacts were m
Autor:
Yuval Carmel, Amikam Birnboim
Publikováno v:
Journal of the American Ceramic Society. 82:313-318
A theoretical investigation of previous experiments on the microwave heating of cylindrical samples of powdered ZnO in nitrogen and air environments has been presented. Unlike heating in air, which showed an exponentially saturating temperature behav
Publikováno v:
Journal of the American Ceramic Society. 84:1315-1320
This work is devoted to the theoretical understanding of the microstructure and thermal conductivity relationships of compacted ceramic powders in the initial, nondensifying stage of sintering. A model based on surface diffusion of vacancies for the
Autor:
Jeffrey P. Calame, Amikam Birnboim, Yuval Carmel, D. Gershon, Evan Pert, Otto C. Wilson, Tayo Olorunyolemi, Isabel K. Lloyd
Publikováno v:
Journal of the American Ceramic Society. 84:1981-1986
Reliable and accurate temperature measurement during microwave processing of ceramic bodies is controversial. Although thermocouples are routinely used in conventional thermal furnaces, their presence in microwave furnaces can locally distort the ele
Autor:
Otto C. Wilson, Yuval Carmel, Stephen Smith, Amikam Birnboim, Isabel K. Lloyd, R. J. Campbell, Tayo Olorunyolemi
Publikováno v:
Journal of the American Ceramic Society. 85:1249-1253
The thermal conductivity of ZnO with different particle sizes (micrometer, submicrometer, and nanometer) was measured using the laser flash technique. As the green samples were heated from room temperature to 600°C (and 1000°C) and then cooled down
Publikováno v:
Journal of Applied Physics. 89:8117-8120
The dependence of the permittivity of porous alumina on the microstructure was studied. Three different algebraic mixing laws inaccurately predicted the measured effective permittivity of the three-phase material, which was alumina, air, and water. F
Publikováno v:
Journal of Applied Physics. 89:8110-8116
The effect of microstructure on the complex permittivity of alumina composites was studied. Three different algebraic mixing laws (Maxwell–Garnett, effective medium approximation, and the Landau–Lifshitz–Looyenga formula) inaccurately predicted
Publikováno v:
Journal of Applied Physics. 85:478-482
During microwave sintering of compacted ceramic powders, the electric field distribution within the ceramic body on a macroscale is determined by a combination of the operating frequency, the sample shape, and its permittivity. In contrast, our studi
Autor:
Otto C. Wilson, M. Walter, Tayo Olorunyolemi, Yuval Carmel, E. Pert, A. Jaworski, Jeffrey P. Calame, Geng-fu Xu, D. Gershon, Amikam Birnboim, I. Lloyd
Publikováno v:
IEEE Conference Record - Abstracts. 1999 IEEE International Conference on Plasma Science. 26th IEEE International Conference (Cat. No.99CH36297).
Summary form only given. A novel microwave processing system is being developed to study fundamental issues in the sintering of advanced ceramic materials with enhanced dielectric, thermal, optical, and mechanical properties for applications in micro