Under a hydrogen atmosphere, the chemically active metallic carbon caps are preferentially etched away so that high purity s-SWCNTs with a content of ∼95% without any residue metal impurities are obtained by the chemical vapor deposition of ethanol and can be used to fabricate high-performance thin film transistors.
As a result, whereas in the quiescent gas condition, bituminous and sub-bituminous coal particles experienced homogeneous ignition in both O2/N2 and O2/CO2 atmospheres, in the active gas flow condition heterogeneous ignition was evident in O2/CO2.
A multiphase Ge-based Ge/FeGe/FeGe2/C (Fe-Ge-C) composite is prepared through the reaction between ferrous tartrate and GeO2 at Ar/H2 atmosphere, in which the active Ge, alloying components and amorphous carbon are generated synchronically.
"It has weather, it has hazes in the atmosphere, active geology... Every week I am floored".
Remote sensors include passive systems (instruments that receive information naturally emitted from a region in the atmosphere) and active systems (instruments that emit either acoustic or electromagnetic energy and record the characteristics of this energy after it reflects off an object or surface and returns back to the sensor).
One feature is the gas enrichment cell that will increase the partial pressures of the noble gases in an atmosphere sample by removing all the active gases, carbon dioxide, and nitrogen, to improve the accuracy of their isotopic ratio measurements.
The stabilization of high order spectral elements to solve the transport equations for tracers in the atmosphere remains an active topic of research among atmospheric modelers.
Spicules and the higher macro-spicules (jet-like structures seen at the solar limb) are believed to be the dominant mechanism for mass ejection in the higher solar atmosphere outside active regions.
Lavoisier immediately repeated Priestley's experiments and, between 1775 and 1780, conducted intensive investigations from which he derived the elementary nature of oxygen, recognized it as the "active" principle in the atmosphere, interpreted its role in combustion and respiration, and gave it its name.
Passive braking systems cannot be used due to the lack of an atmosphere, and active braking by rockets significantly adds to the missions costs.
