Determination of the Hydrodynamic Load on an Inundated Bridge Deck by Measurements Performed on a Physical Model

2019 ◽  
Vol 17 (10) ◽  
pp. 1491-1502
Author(s):  
Aleš Dráb ◽  
David Duchan ◽  
Miroslav Špano ◽  
Michal Pavlíček ◽  
Pavel Zubík ◽  
...  
Keyword(s):  
Physical Model ◽  
Bridge Deck ◽  
Hydrodynamic Load

scholarly journals Physical Modelling of Tundish Slag Entrainment under Various Technological Conditions

2017 ◽  
Vol 62 (3) ◽  
pp. 1467-1471 ◽  
Author(s):  
K. Michalek ◽  
K. Gryc ◽  
L. Socha ◽  
M. Tkadlečková ◽  
M. Saternus ◽  
...  
Keyword(s):  
Physical Model ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Physical Modelling ◽  
Critical Periods ◽  
Operational Conditions ◽  
Modelling Methodology ◽  
Slag Entrainment ◽  
The Individual

AbstractThis paper deals with the issue of physical modelling of vortexes creation and tundish slag entrainment over the mouth of the nozzle into the individual casting strands. Proper physical model is equivalent to the operational continuous casting machine No. 2 in TŘINECKÉ ŽELEZÁRNY, a.s. Physical modelling methodology and simulated operational conditions are shortly described. Physical modelling was used for the evaluation of current conditions of steel casting at the application of different impact pads in the tundish. Further, laboratory measurement on the physical model aiming the determination of exact critical periods of vortexes creation and study of the slag entrainment as a consequence of changes in surface level during the tundish refilling to standard level were realised. The obtained results were analysed and discussed.

scholarly journals Phenomena preceding major earthquakes interconnected through a physical model

2019 ◽  
Vol 37 (3) ◽  
pp. 315-324 ◽  
Author(s):  
Panayiotis A. Varotsos ◽  
Nicholas V. Sarlis ◽  
Efthimios S. Skordas
Keyword(s):  
Time Series ◽  
Physical Model ◽  
Order Parameter ◽  
Tohoku Earthquake ◽  
Entropy Change ◽  
Natural Time ◽  
Earth Magnetic Field ◽  
Preceding Period ◽  
Magnetic Field Variations

Abstract. The analysis of earthquake time series in a new time domain termed natural time enables the uncovering of hidden properties in time series of complex systems and has been recently employed as the basis of a method to estimate seismic risk. Natural time also enables the determination of the order parameter of seismicity, which is a quantity by means of which one can identify when the system approaches the critical point (the mainshock occurrence is considered the new phase). Applying this analysis, as an example, to the Japanese seismic data from 1 January 1984 until the super-giant M 9 Tōhoku earthquake on 11 March 2011, we find that almost 3 months before its occurrence the entropy change of seismicity under time reversal is minimized on 22 December 2010, which signals an impending major earthquake. On this date the order parameter fluctuations of seismicity exhibit an abrupt increase. This increase is accompanied by various phenomena; e.g., from this date the horizontal GPS azimuths start to become gradually oriented toward the southern direction, while they had random orientation during the preceding period. Two weeks later, a minimum of the order parameter fluctuations of seismicity appears accompanied by anomalous Earth magnetic field variations and by full alignment of the orientations of GPS azimuths southwards leading to the most intense crust uplift. These phenomena are discussed and found to be in accordance with a physical model which seems to explain on a unified basis anomalous precursory changes observed either in ground-based measurements or in satellite data.

scholarly journals Stability of Rubble Mound Breakwaters—A Study of the Notional Permeability Factor, Based on Physical Model Tests

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 934 ◽  
Author(s):  
Mads Røge Eldrup ◽  
Thomas Lykke Andersen ◽  
Hans Falk Burcharth
Keyword(s):  
Physical Model ◽  
Slope Angle ◽  
Model Tests ◽  
Permeability Factor ◽  
Physical Model Tests ◽  
Stability Model ◽  
The Stability ◽  
Rubble Mound Breakwaters ◽  
Layer Composition

The Van der Meer formulae for quarry rock armor stability are commonly used in breakwater design. The formulae describe the stability as a function of the wave characteristics, number of waves, front slope angle and rock material properties. The latter includes a so-called notional permeability factor characterizing the permeability of the structure. Based on armor stability model tests with three armor layer compositions, Van der Meer determined three values of the notional permeability. Based on numerical model results he added for a typical layer composition one more value. Based on physical model tests, the present paper provides notional permeability factors for seven layer compositions of which two correspond to the compositions tested by Van der Meer. The results of these two layer compositions are within the scatter of the results by Van der Meer. To help determination of the notional permeability for non-tested layer compositions, a simple empirical formula is presented.

Determination of a physical model for double diffused transistors

1968 ◽  
Vol 11 (3) ◽  
pp. 365-375 ◽  
Author(s):  
R.E. Thomas ◽  
A.R. Boothroyd
Keyword(s):  
Physical Model
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