scholarly journals Centrifugal Disc Spreading Quality as a Function of Feeding Position: Simulations and Experiments

1970 ◽  
Vol 66 (1) ◽  
Author(s):  
Ágnes GINDERT-KELE ◽  
Erzsébet ANCZA ◽  
Zoltán HAGYMÁSI
Keyword(s):  
Analytical Model ◽  
Particle Motion ◽  
In Silico ◽  
Unified Model ◽  
Single Particles ◽  
Air Drag ◽  
Drag Coefficients ◽  
Selection For ◽  
Empirical Corrections ◽  
Spinning Disc

A combination of an improved analytical model for the description of particle motion on the spinning disc and hodographic ballistics in the air was described earlier. The unified model (Gindert-Kele, 2006) is considered nearly exact for single particles leaving a conical disc with pitched straight vanes. ”In-silico” spreading calculations with experimentally characterized particle clusters are sensitive to both spreader and fertilizer properties. However, parameters like loading area and air-drag coefficients may need empirical corrections. In this work experimental and simulated spreading patterns are compared demonstrating the importance of the angle selection for fertilizer feeding.

scholarly journals Particle characterisation and bioaccessibility of manganese in particulate matter in silico- and ferromanganese smelters

2021 ◽  
Author(s):  
Stine Eriksen Hammer ◽  
Torunn Ervik ◽  
Dag G. Ellingsen ◽  
Yngvar Thomassen ◽  
Stephan Weinbruch ◽  
...  
Keyword(s):  
Particulate Matter ◽  
In Silico ◽  
Single Particles ◽  
Physicochemical Characterisation ◽  
Particle Characterisation

(1) Physicochemical characterisation of single particles collected in an FeMn/SiMn furnace hall. (2) Bioaccessibility of manganese in particulate matter tested in terms of dissolution in Gamble solution.

A CONCEPT OF THE AIR DRAG LAW FOR SPHERICAL FRAGMENTS PREPARED ON THE BASIS OF AASTP-1 ALLIED PUBLICATION DATA

2018 ◽  
Vol 146 (2) ◽  
pp. 73-91
Author(s):  
Cezary Kwiecień
Keyword(s):  
Reverse Engineering ◽  
Drag Coefficient ◽  
Air Drag ◽  
Drag Coefficients ◽  
Explosive Materials ◽  
Publication Data ◽  
The Common ◽  
Discrete Values ◽  
Drag Law

A concept of the air drag law for spherical fragments (balls) is presented in the paper on the base of a set of discrete values of the air drag coefficients included in the AASTP-1 [1] document – an allied publication on the principles for storage of ammunition and explosive materials. The proposal is aimed to increase the reliability of calculations for different expert investigations concerning possible impacts of enforced fragmentation ammunition with spherical fragments into the objects. The proposed method may be used at designing stages or at the reverse engineering for assessing potential threats caused by unknown types of the ordnance. It may be also useful at external ballistic calculations for pellet ammunition (hunting and police) and moreover for the tank canister shells. Anyway the common access to computers is an encouragement for leaving apart the methods which assume a constant value of the aerodynamical drag coefficient.

scholarly journals Unified Model of Shot Noise in the Tunneling Current in Sub-10 nm MOSFETs

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2759
Author(s):  
Jonghwan Lee
Keyword(s):  
Analytical Model ◽  
Shot Noise ◽  
Tunneling Current ◽  
Fano Factor ◽  
Unified Model ◽  
Analytical Formulation ◽  
Landauer Formula ◽  
Gate Tunneling ◽  
Tunneling Currents ◽  
Ultrathin Oxide

A single unified analytical model is presented to predict the shot noise for both the source-to-drain (SD) and the gate tunneling current in sub-10 nm MOSFETs with ultrathin oxide. Based on the Landauer formula, the model is constructed from the sequential tunneling flows associated with number fluctuations. This approach provides the analytical formulation of the shot noise as a function of the applied voltages. The model performs well in predicting the Fano factor for shot noise in the SD and gate tunneling currents.

Centrifugal Spreading: an Analytical Model for the Motion of Fertiliser Particles on a Spinning Disc

2005 ◽  
Vol 92 (2) ◽  
pp. 157-164 ◽  
Author(s):  
S. Villette ◽  
F. Cointault ◽  
E. Piron ◽  
B. Chopinet
Keyword(s):  
Analytical Model ◽  
Spinning Disc

scholarly journals Empirical corrections to snow creep pressure equations

1984 ◽  
Vol 21 (1) ◽  
pp. 191-193 ◽  
Author(s):  
D. M. McClung
Keyword(s):  
Finite Element ◽  
Analytical Model ◽  
Two Dimensional ◽  
Snow Pack ◽  
One Dimensional ◽  
Dimensional Finite Element ◽  
Internal Deformation ◽  
Analytical Correction ◽  
Empirical Corrections ◽  
Snow Mechanics

A one-dimensional analytical model has been proposed for the average quasi-static snow creep pressure parallel to a slope at the centre of a long rigid structure. The model includes forces due to interruption of creep (internal deformation) and glide (slip of the snow cover over the ground). In reality, the problem is two-dimensional. By a series of two-dimensional finite element calculations, an empirical analytical correction has been found to improve the model. This yields a simple analytical model that provides results within 6% or less of the more complex two-dimensional problem. Keywords: snow mechanics, creep, glide, snow pressure, snow-pack, finite element.

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