Zavitsanos, P. D.
Most widely held works by P. D Zavitsanos
Coal desulfurization using microwave energy by N.C.) Industrial Environmental Research Laboratory (Research Triangle Park ( Book )
3 editions published between 1978 and 1979 in English and held by 80 libraries worldwide
The Second European Symposium on the Time-of-Flight Mass Spectrometer : University of Salford, England, July 1969 ( Book )
1 edition published in 1970 in English and held by 7 libraries worldwide
Coal desulfurization by a microwave process ( Book )
1 edition published in 1981 in English and held by 2 libraries worldwide
Investigation of Group IV-A Metal Vapor Generation and Flux Behavior ( Book )
2 editions published between 1977 and 1978 in English and held by 1 library worldwide
The gas phase reactions of certain Group IV-A metals with N2O can give rise to electronically excited metal oxide species which have been considered candidates as active molecules for electronic transition chemical lasers. The objectives of this program were to obtain experimental data on selected Group IV-A metals as they pertain to the properties of the gas phase generation and transfer and also to devise practical schemes for developing a metal vapor generator which may permit an evaluation of their potential as laser pumping sources.
THE VAPOR PRESSURE OF BARIUM ( Book )
1 edition published in 1968 in English and held by 1 library worldwide
The vapor pressure and the heat of vaporization of barium were measured using the Knudsen target technique. A recording microbalance was used to measure both the effusion rate and the recoil force exerted by the beam onto the target. The measured vapor pressure may be presented by log P(atm) = 5.145 - 9597/T. Mass spectrometric investigation was conducted with the time-of-flight mass spectrometer which produced a second-law heat of vaporization.
THE VAPORIZATION OF PYROLYTIC GRAPHITE ( Book )
1 edition published in 1966 in English and held by 1 library worldwide
The vaporization of pyrolytic graphite was studied by the Knudsen effusion and Langmuir free vaporization techniques using a microbalance and a time-of-flight mass spectrometer. Vapor pressures were obtained in the temperature range 2417K - 2700K for C, C sub 2, and C sub 3; respective heats of vaporization were calculated by the third-law method. Langmuir vaporization measurements were carried out in the temperature range 2250K - 2760K. The ratios of vaporization coefficients obtained from mass spectroscopic measurements are: alpha sub 2/alpha sub 1 = 2.1, alpha sub 1/alpha sub 3 = 10.6. Use of vapor pressure data and vaporization rates was made to arrive at an overall vaporization coefficient equal to 0.095 and individual values of alpha sub 1 = 0.24, alpha sub 2 = 0.50 and alpha sub 3 = 0.023. (Author).
Study of Laser Effects on Heat Shield Materials ( Book )
1 edition published in 1979 in English and held by 1 library worldwide
Materials of the type used for heat shields on re-entry vehicles undergo varying degrees of property and characteristic changes as a result of exposure to laser radiation in a space type environment at flux levels ranging from about 1 watt/sq cm up to flux levels in excess of 10,000 watts/sq cm. These changes are, in general: (a) outgassing and depolymerization of the resin binder at low heat fluxes with potential loss in strength and/or delamination of the shield; (b) surface charring and high rates of outgassing and material decomposition/vaporization at intermediate heat fluxes and; (c) excessive rates of outgassing and material vaporization and shield thickness reduction at high heat fluxes. Thus a re-entry vehicle heat shield exposed to laser radiation in a space environment may provide inadequate protection during entry for reasons of reduced structural capability or inadequate remaining shield thickness. Also the heat soak into the shield and structure resulting from exposure times of several minutes may result in unacceptably high levels of temperature for the vehicle substructure or payload prior to or during entry.
Experimental study of the sublimation of graphite at high temperatures ( Book )
1 edition published in 1969 in English and held by 1 library worldwide
COAL DESULFURIZATION USING MICROWAVE ENERGY by U.S ( Book )
1 edition published in 1978 in English and held by 1 library worldwide
Redefinition and improvement of metal vapor release technology by P. D Zavitsanos ( Book )
1 edition published in 1977 in English and held by 1 library worldwide
Nuclear effects simulation : thermal effects by P. D Zavitsanos ( Book )
1 edition published in 1986 in English and held by 1 library worldwide
High temperature vaporization studies using a recording microbalance and electron bombardment heating by P. D Zavitsanos ( Book )
1 edition published in 1963 in English and held by 0 libraries worldwide