135 research outputs found
Brief communication: Identification of tundra topsoil frozen/thawed state from SMAP and GCOM-W1 radiometer measurements using the spectral gradient method
From 2015 to 2020, using the spectral gradient
radiometric method, the possibility of the frozen/thawed (FT) state
identification of tundra soil was investigated based on Soil Moisture Active Passive (SMAP) and Global Change Observation Mission – Water Satellite 1 (GCOM-W1) satellite observations of 10 test sites located in the Arctic regions of
Canada, Finland, Russia, and the USA. It is shown that the spectral
gradients of brightness temperature and reflectivity (measured in the
frequency range from 1.4 to 36.5 GHz with horizontal polarization, a
determination coefficient from 0.775 to 0.834, a root-mean-square error from
6.6 to 10.7 d and a bias from −3.4 to +6.5 d) make it
possible to identify the FT state of the tundra topsoil. The spectral gradient
method has a higher accuracy with respect to the identification of the FT state of
tundra soils than single-frequency methods based on the
calculation of polarization index.</p
Stereoselective amination of racemic sec-alcohols through sequential application of laccases and transaminases
ChemInform Abstract: Application of 1-(3-Bromo-3,3-difluoroprop-1-ynyl)benzenes in Diels-Alder Reactions: Synthesis of ortho-CF 2
ChemInform Abstract: Multichannel Reaction of α-Bromoenones with 1,2-Diamines: Synthesis of 1,4-Diazabicyclo[4.1.0]hept-4-enes by Reaction with N-Unsubstituted 1,2-Diamines.
ChemInform Abstract: Synthesis of α-Trifluoromethyl-phenethylamines from α-Trifluoromethyl β-Aryl Enamines and β-Chloro-β-(trifluoromethyl)styrenes.
ChemInform Abstract: Selective Synthesis of α-Trifluoromethyl-β-aryl Enamines or Vinylogous Guanidinium Salts by Treatment of β-Halo-β-trifluoromethylstyrenes with Secondary Amines under Different Conditions.
- …