A Buried Water Molecule Influences Reactivity in α-Amylase on a Subnanosecond Time Scale

ACS Catalysis ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 4055-4063 ◽  
Author(s):  
Diogo Santos-Martins ◽  
Ana R. Calixto ◽  
Pedro A. Fernandes ◽  
Maria J. Ramos
Keyword(s):  
Water Molecule ◽  
Time Scale ◽  
Subnanosecond Time

Study of A-Si:H drift mobility in subnanosecond time scale

1989 ◽  
Vol 114 ◽  
pp. 354-356 ◽  
Author(s):  
G. Juška ◽  
G. Jukonis ◽  
J. Kočka
Keyword(s):  
Time Scale ◽  
Drift Mobility ◽  
Subnanosecond Time

scholarly journals Isoscape of amount-weighted annual mean precipitation tritium (<sup>3</sup>H) activity from 1976 to 2017 for the Adriatic–Pannonian region – AP<sup>3</sup>H_v1 database

2020 ◽  
Vol 12 (3) ◽  
pp. 2061-2073 ◽  
Author(s):  
Zoltán Kern ◽  
Dániel Erdélyi ◽  
Polona Vreča ◽  
Ines Krajcar Bronić ◽  
István Fórizs ◽  
...  
Keyword(s):  
Water Molecule ◽  
Time Scale ◽  
Model Performance ◽  
Special Focus ◽  
Global Models ◽  
Tritium Activity ◽  
Out Of Sample ◽  
Natural Tracer

Abstract. Tritium (3H) as a constituent of the water molecule is an important natural tracer in hydrological sciences. The anthropogenic tritium introduced into the atmosphere unintentionally became an excellent tracer of processes on a time scale of up to 100 years. A prerequisite for tritium applications is to know the distribution of tritium activity in precipitation. Here we present a database of isoscapes derived from 41 stations for amount-weighted annual mean tritium activity in precipitation for the period 1976 to 2017 on spatially continuous interpolated 1 km×1 km grids for the Adriatic–Pannonian region (called the AP3H_v1 database), with a special focus on post-2010 years, which are not represented by existing global models. Five stations were used for out-of-sample evaluation of the model performance, independently confirming its capability of reproducing the spatiotemporal tritium variability in the region. The AP3H database is capable of providing reliable spatiotemporal input for hydrogeological application at any place within Slovenia, Hungary, and their surroundings. Results also show a decrease in the average spatial representativity of the stations regarding tritium activity in precipitation from ∼440 km in 1970s, when bomb tritium still prevailed in precipitation, to ∼235 km in the 2010s. The post-2010 isoscapes can serve as benchmarks for background tritium activity for the region, helping to determine potential future local increases in technogenic tritium from these backgrounds. The gridded tritium isoscape is available in NetCDF-4 at https://doi.org/10.1594/PANGAEA.896938 (Kern et al., 2019).

scholarly journals Isoscape of precipitation amount-weighted annual mean tritium (<sup>3</sup>H) activity from 1976 to 2017 for the Adriatic-Pannonian region

2020 ◽  
Author(s):  
Zoltán Kern ◽  
István Gábor Hatvani ◽  
Dániel Erdélyi ◽  
Polona Vreča ◽  
Ines Krajcar Bronić ◽  
...  
Keyword(s):  
Water Molecule ◽  
Time Scale ◽  
Input Data ◽  
Precipitation Amount ◽  
Model Performance ◽  
Regional Model ◽  
Special Focus ◽  
Global Models ◽  
Tritium Activity ◽  
Natural Tracer

Abstract. Tritium (3H) as a constituent of the water molecule is an important natural tracer in hydrological sciences. The anthropogenic tritium introduced into the atmosphere became unintentionally an excellent tracer of processes on the time scale of up to a 100 years. A prerequisite for tritium applications is to know the distribution of tritium activity in precipitation. Here we present the spatially continuous gridded database (isoscapes) for amount-weighted annual mean tritium activity in precipitation for the period 1976 to 2017 on 1 × 1 km grids for the Adriatic-Pannonian Region (using 39 stations), with a special focus on post-2010 years which are not represented by existing global models. Three stations were used to check the model performance independently confirming its capability to reproducing the spatiotemporal tritium variability in the region. This Regional model is capable of providing reliable spatiotemporal input data for hydrogeological application at any place within Slovenia, Hungary and its surroundings. Results also show a decrease in the average spatial representativity of the stations regarding tritium activity in precipitation from ~ 600 km in 1970s when bomb-tritium was still prevailing in precipitation, to ~ 300 km in the 2010s. The post-2010 isoscapes can serve as benchmarks for background tritium activity for the region, helping to determine local increases of technogenic tritium from these backgrounds. The gridded tritium isoscape is available in NetCDF-4 at doi:10.1594/PANGAEA.896938 (Kern et al., 2019).

Large-scale Motion of Solar Filaments

2000 ◽  
Vol 179 ◽  
pp. 205-208
Author(s):  
Pavel Ambrož ◽  
Alfred Schroll
Keyword(s):  
Magnetic Flux ◽  
Proper Motion ◽  
Time Scale ◽  
Large Scale ◽  
Accuracy Of Measurements ◽  
Solar Filaments ◽  
General Movement ◽  
Scale Motion ◽  
Velocity Scatter

AbstractPrecise measurements of heliographic position of solar filaments were used for determination of the proper motion of solar filaments on the time-scale of days. The filaments have a tendency to make a shaking or waving of the external structure and to make a general movement of whole filament body, coinciding with the transport of the magnetic flux in the photosphere. The velocity scatter of individual measured points is about one order higher than the accuracy of measurements.

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