The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Roman Ya. Kezerashvili - One of the best experts on this subject based on the ideXlab platform.
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Extrasolar space exploration by a solar sail accelerated via Thermal Desorption of coating
Advances in Space Research, 2019Co-Authors: Elena Ancona, Roman Ya. KezerashviliAbstract:Abstract For extrasolar space exploration it might be very convenient to take advantage of space environmental effects such as solar radiation heating to accelerate a solar sail coated by materials that undergo Thermal Desorption at a particular temperature. Thermal Desorption can provide additional thrust as heating liberates atoms, embedded on the surface of the solar sail. We are considering orbital dynamics of a solar sail coated with materials that undergo Thermal Desorption at a specific temperature, as a result of heating by solar radiation at a particular heliocentric distance, and focus on two scenarios that only differ in the way the sail approaches the Sun. For each scenario once the perihelion is reached, the sail coat undergoes Thermal Desorption. When the Desorption process ends, the sail then escapes the Solar System having the conventional acceleration due to solar radiation pressure. We study the dependence of a cruise speed of a solar sail on perihelion of the orbit where the solar sail is deployed. The following scenarios are considered and analyzed: (1) Hohmann transfer plus Thermal Desorption. In this scenario the sail would be carried as a payload to the perihelion with a conventional propulsion system by a Hohmann transfer from Earth’s orbit to an orbit very close to the Sun and then be deployed. Our calculations show that the cruise speed of the solar sail varies from 173 km/s to 325 km/s that corresponds to perihelion 0.3 AU and 0.1 AU, respectively. (2) Elliptical transfer plus Slingshot plus Thermal Desorption. In this scenario the transfer occurs from Earth’s orbit to Jupiter’s orbit; then a Jupiter’s fly-by leads to the orbit close to the Sun, where the sail is deployed and Thermal Desorption comes active. In this case the cruise speed of the solar sail varies from 187 km/s to 331 km/s depending on the perihelion of the orbit. Our study analyses and compares the different scenarios in which Thermal Desorption comes beside traditional propulsion systems for extrasolar space exploration.
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Orbital dynamics of a solar sail accelerated by Thermal Desorption of coatings
arXiv: Space Physics, 2016Co-Authors: Elena Ancona, Roman Ya. KezerashviliAbstract:In this study we considered a solar sail coated with materials that undergo Thermal Desorption at a specific temperature, as a result of heating by solar radiation at a particular heliocentric distance. Three different scenarios, that only differ in the way the sail approaches the Sun, were analyzed and compared. In every case once the perihelion is reached, the sail coat undergoes Thermal Desorption. When the Desorption process ends, the sail then escapes the Solar System having the conventional acceleration due to solar radiation pressure. Thermal Desorption here comes as an additional source of solar sail acceleration beside traditional propulsion systems for extrasolar space exploration. The compared scenarios are the following: i. Hohmann transfer plus Thermal Desorption. In this scenario the sail would be carried as a payload to the perihelion with a conventional propulsion system by an Hohmann transfer from Earth's orbit to an orbit very close to the Sun (almost at 0.1 AU) and then be deployed there. ii. Elliptical transfer plus Slingshot plus Thermal Desorption. In this scenario the transfer occurs from Earth's orbit to Jupiter's orbit. A Jupiter's fly-by leads to the orbit close to the Sun, where the sail is deployed. iii. Two stage acceleration of the solar sail through Thermal Desorption. The proposed sail has two coats of the materials that undergo Thermal Desorption at different temperatures depending on the heliocentric distance. The first Desorption occurs at the Earth orbit and provides the thrust needed to propel the solar sail toward the Sun. The second Desorption is equivalent to that of the other scenarios.
M R Martineztarazona - One of the best experts on this subject based on the ideXlab platform.
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mercury compounds characterization by Thermal Desorption
Talanta, 2013Co-Authors: M. Rumayor, Mercedes Diazsomoano, M A Lopezanton, M R MartineztarazonaAbstract:The ability to accurately determine metal mercury content and identify different mercury species in solid samples is essential for developing remediation and control strategies. The aim of the present study is to characterize mercury compounds based on Thermal Desorption. For this purpose a series of samples was prepared and the operational parameters—heating velocity, carrier gas—were optimized. Fifteen commercial mercury compounds were analyzed for use as fingerprints. The results of the study show that the identification of mercury species by the method of Thermal Desorption is possible. The temperature of Desorption increased according to the following order HgI2
Yanlin Cheng - One of the best experts on this subject based on the ideXlab platform.
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decomposition kinetics study of zirconium hydride by interrupted Thermal Desorption spectroscopy
Journal of Alloys and Compounds, 2015Co-Authors: Li Liang, Binghua Tang, Wei Xiang, Yuan Wang, Yanlin ChengAbstract:Abstract Thermal Desorption kinetics of zirconium hydride powder were studied using thermogravimetry and simultaneous Thermal Desorption spectroscopy. The activation energies for observed Desorption peaks were estimated according to Kissinger relation. The intermediate phase composition was studied using X-ray diffraction by rapid cooling on different stages of heating. The origins of the peaks were described as the equilibrium hydrogen pressure of a number of consecutive phase regions that decomposition reaction passed through. The zirconium monohydride γZrH was observed for extended periods of time at ambient conditions, which has been supposed to be metastable for a long time.
M. Rumayor - One of the best experts on this subject based on the ideXlab platform.
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mercury compounds characterization by Thermal Desorption
Talanta, 2013Co-Authors: M. Rumayor, Mercedes Diazsomoano, M A Lopezanton, M R MartineztarazonaAbstract:The ability to accurately determine metal mercury content and identify different mercury species in solid samples is essential for developing remediation and control strategies. The aim of the present study is to characterize mercury compounds based on Thermal Desorption. For this purpose a series of samples was prepared and the operational parameters—heating velocity, carrier gas—were optimized. Fifteen commercial mercury compounds were analyzed for use as fingerprints. The results of the study show that the identification of mercury species by the method of Thermal Desorption is possible. The temperature of Desorption increased according to the following order HgI2
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Mercury compounds characterization by Thermal Desorption
Talanta, 2013Co-Authors: M. Rumayor, Mercedes Díaz-somoano, M.a. Lopez-anton, M.r. Martínez-tarazonaAbstract:The ability to accurately determine metal mercury content and identify different mercury species in solid samples is essential for developing remediation and control strategies. The aim of the present study is to characterize mercury compounds based on Thermal Desorption. For this purpose a series of samples was prepared and the operational parameters—heating velocity, carrier gas—were optimized. Fifteen commercial mercury compounds were analyzed for use as fingerprints. The results of the study show that the identification of mercury species by the method of Thermal Desorption is possible. The temperature of Desorption increased according to the following order HgI2
Elena Ancona - One of the best experts on this subject based on the ideXlab platform.
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Extrasolar space exploration by a solar sail accelerated via Thermal Desorption of coating
Advances in Space Research, 2019Co-Authors: Elena Ancona, Roman Ya. KezerashviliAbstract:Abstract For extrasolar space exploration it might be very convenient to take advantage of space environmental effects such as solar radiation heating to accelerate a solar sail coated by materials that undergo Thermal Desorption at a particular temperature. Thermal Desorption can provide additional thrust as heating liberates atoms, embedded on the surface of the solar sail. We are considering orbital dynamics of a solar sail coated with materials that undergo Thermal Desorption at a specific temperature, as a result of heating by solar radiation at a particular heliocentric distance, and focus on two scenarios that only differ in the way the sail approaches the Sun. For each scenario once the perihelion is reached, the sail coat undergoes Thermal Desorption. When the Desorption process ends, the sail then escapes the Solar System having the conventional acceleration due to solar radiation pressure. We study the dependence of a cruise speed of a solar sail on perihelion of the orbit where the solar sail is deployed. The following scenarios are considered and analyzed: (1) Hohmann transfer plus Thermal Desorption. In this scenario the sail would be carried as a payload to the perihelion with a conventional propulsion system by a Hohmann transfer from Earth’s orbit to an orbit very close to the Sun and then be deployed. Our calculations show that the cruise speed of the solar sail varies from 173 km/s to 325 km/s that corresponds to perihelion 0.3 AU and 0.1 AU, respectively. (2) Elliptical transfer plus Slingshot plus Thermal Desorption. In this scenario the transfer occurs from Earth’s orbit to Jupiter’s orbit; then a Jupiter’s fly-by leads to the orbit close to the Sun, where the sail is deployed and Thermal Desorption comes active. In this case the cruise speed of the solar sail varies from 187 km/s to 331 km/s depending on the perihelion of the orbit. Our study analyses and compares the different scenarios in which Thermal Desorption comes beside traditional propulsion systems for extrasolar space exploration.
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Orbital dynamics of a solar sail accelerated by Thermal Desorption of coatings
arXiv: Space Physics, 2016Co-Authors: Elena Ancona, Roman Ya. KezerashviliAbstract:In this study we considered a solar sail coated with materials that undergo Thermal Desorption at a specific temperature, as a result of heating by solar radiation at a particular heliocentric distance. Three different scenarios, that only differ in the way the sail approaches the Sun, were analyzed and compared. In every case once the perihelion is reached, the sail coat undergoes Thermal Desorption. When the Desorption process ends, the sail then escapes the Solar System having the conventional acceleration due to solar radiation pressure. Thermal Desorption here comes as an additional source of solar sail acceleration beside traditional propulsion systems for extrasolar space exploration. The compared scenarios are the following: i. Hohmann transfer plus Thermal Desorption. In this scenario the sail would be carried as a payload to the perihelion with a conventional propulsion system by an Hohmann transfer from Earth's orbit to an orbit very close to the Sun (almost at 0.1 AU) and then be deployed there. ii. Elliptical transfer plus Slingshot plus Thermal Desorption. In this scenario the transfer occurs from Earth's orbit to Jupiter's orbit. A Jupiter's fly-by leads to the orbit close to the Sun, where the sail is deployed. iii. Two stage acceleration of the solar sail through Thermal Desorption. The proposed sail has two coats of the materials that undergo Thermal Desorption at different temperatures depending on the heliocentric distance. The first Desorption occurs at the Earth orbit and provides the thrust needed to propel the solar sail toward the Sun. The second Desorption is equivalent to that of the other scenarios.
