Interception of radionuclides by planophile crops: A simple semi-empirical modelling approach in case of nuclear accident fallout

2020 ◽  
Vol 266 ◽  
pp. 115308
Author(s):  
A. Cristina ◽  
R. Samson ◽  
N. Horemans ◽  
M. Van Hees ◽  
J. Wannijn ◽  
...  
Keyword(s):  
Nuclear Accident ◽  
Empirical Modelling ◽  
Semi Empirical ◽  
Modelling Approach

Augmenting Molecular Junctions with Different Transition Metal Contacts

2013 ◽  
Vol 05 (02) ◽  
pp. 1350009 ◽  
Author(s):  
Rupan Preet Kaur ◽  
Ravinder Singh Sawhney ◽  
Derick Engles
Keyword(s):  
Electron Transport ◽  
Nanometer Scale ◽  
Metal Contacts ◽  
Transport Parameters ◽  
Empirical Modelling ◽  
Copper Electrodes ◽  
Electron Transport Properties ◽  
Semi Empirical ◽  
Maximum Conductance ◽  
Modelling Approach

In this research paper, the effect of the material of electrodes at the nanometer scale was elucidated towards measuring the electron transport properties of a single molecular junction comprising of anthracenedithiol molecule (ADT) stringed to two semi-infinite metallic electrodes using Extended Huckle Theory (EHT)-based semi-empirical modelling approach. The electron transport parameters i.e., I–V curves, Conductance-Voltage curves and transmission spectrum were investigated through ADT molecule by buffering it between different electrodes composed of rhodium, palladium, nickel and copper, all from transition metals series, under finite bias voltages within Keldysh's non equilibrium green function formulism (NEGF). The simulated results revealed that the copper electrodes showed maximum conduction whereas palladium showed least. The maximum conductance of 0.82 G0 and 43 μA current was exhibited by copper and thus affirmed to be the most effective electrode at nanometre scale when compared with other electrodes viz. nickel, rhodium and palladium.

scholarly journals Review of a Semi-Empirical Modelling Approach for Cohesive Sediment Transport in River Systems

Water ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 256
Author(s):  
Bommanna G. Krishnappan
Keyword(s):  
Shear Stress ◽  
Sediment Transport ◽  
Critical Shear Stress ◽  
Cohesive Sediment ◽  
River Systems ◽  
Empirical Modelling ◽  
Cohesive Sediment Transport ◽  
Definition Of ◽  
Semi Empirical ◽  
Modelling Approach

In this paper, a review of a semi-empirical modelling approach for cohesive sediment transport in river systems is presented. The mathematical modelling of cohesive sediment transport is a challenge because of the number of governing parameters controlling the various transport processes involved in cohesive sediment, and hence a semi-empirical approach is a viable option. A semi-empirical model of cohesive sediment called the RIVFLOC model developed by Krishnappan is reviewed and the model parameters that need to be determined using a rotating circular flume are highlighted. The parameters that were determined using a rotating circular flume during the application of the RIVFLOC model to different river systems include the critical shear stress for erosion of the cohesive sediment, critical shear stress for deposition according to the definition of Partheniades, critical shear stress for deposition according to the definition of Krone, the cohesion parameter governing the flocculation of cohesive sediment and a set of empirical parameters that define the density of the floc in terms of the size of the flocs. An examination of the variability of these parameters shows the need for testing site-specific sediments using a rotating circular flume to achieve a reliable prediction of the RIVFLOC model. Application of the model to various river systems has highlighted the need for including the entrapment process in a cohesive sediment transport model.

Pressure-induced pH changes in aqueous solutions – On-line measurement and semi-empirical modelling approach

2011 ◽  
Vol 56 (1) ◽  
pp. 6-13 ◽  
Author(s):  
Daniele Bortoluzzi ◽  
Claudio Cinquemani ◽  
Elisa Torresani ◽  
Sara Spilimbergo
Keyword(s):  
Aqueous Solutions ◽  
Empirical Modelling ◽  
Ph Changes ◽  
Line Measurement ◽  
On Line ◽  
Semi Empirical ◽  
Modelling Approach

scholarly journals Progress in semi-empirical modelling of main-sequence stellar chromospheres

1996 ◽  
Vol 176 ◽  
pp. 547-555
Author(s):  
E.R. Houdebine
Keyword(s):  
Main Sequence ◽  
Radiation Transfer ◽  
Research Programme ◽  
Significant Progress ◽  
Wave Dissipation ◽  
Empirical Modelling ◽  
Spectral Signatures ◽  
Outer Atmosphere ◽  
Semi Empirical

We present the results of a long term research programme on the outer atmospheres of main-sequence dwarfs. Combining NLTE-radiation transfer calculations with high resolution spectroscopic observations have led to significant progress in understanding chromospheric physical properties and spectral signatures. We emphasize that in order to unravel the extremely complex physics of the outer atmosphere and its energy source, magnetic field and acoustic wave dissipation, one must isolate the influence of all stellar parameters.

Recruitment of burbot (Lota lota L.) in Lake Erie: an empirical modelling approach

2010 ◽  
Vol 19 (3) ◽  
pp. 326-337 ◽  
Author(s):  
M. A. Stapanian ◽  
L. D. Witzel ◽  
A. Cook
Keyword(s):  
Lake Erie ◽  
Lota Lota ◽  
Empirical Modelling ◽  
Modelling Approach

scholarly journals Semi-empirical modelling of stellar magnetic activity

2011 ◽  
Vol 7 (S286) ◽  
pp. 307-316
Author(s):  
Adriana Valio
Keyword(s):  
Activity Cycle ◽  
Solar Activity Cycle ◽  
Magnetic Activity ◽  
Maunder Minimum ◽  
The Sun ◽  
Cyclic Activity ◽  
Empirical Modelling ◽  
Level Of Activity ◽  
Total Luminosity ◽  
Semi Empirical

AbstractSince Galileo, for four hundred years, dark spots have been observed systematically on the surface of the Sun. The monitoring of the sunspot number has shown that their number varies periodically every 11 years. This is the well-known solar activity cycle that is caused by the periodic changes of the magnetic field of the Sun. Not only do spots vary in number on a timescale of a decade, but the total luminosity and other signatures of activity such as flares and coronal mass ejections also increase and decrease with the 11-year cycle. Still unexplained to the present date are periods of decades with almost an absence of activity, where the best known example is the Maunder Minimum. Other stars also exhibit signs of cyclic activity, however the level of activity is usually thousand times higher than the solar one. Obviously, this is due to the difficulty of observing activity at the solar level on most stars. Presently, a method has been developed to detect and study individual solar like spots on the surface of planet-harbouring stars. As the planet eclipses dark patches on the surface of the star, a detectable signature can be observed in the light curve of the star during the transit. The study of a different variety of stars allows for a better understanding of magnetic cycles and the evolution of stars.

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