THE PERFORMANCE OF A SKYSCREEN SYSTEM USING AN ELECTRICAL ANALOGUE COMPUTER

1963 ◽  
Author(s):  
Donald F. Menne
Keyword(s):  
Analogue Computer ◽  
Electrical Analogue

Numerical analysis of variable thickness plates

1966 ◽  
Vol 1 (3) ◽  
pp. 231-238 ◽  
Author(s):  
C. T. Harnden ◽  
K. R. Rushton
Keyword(s):  
Numerical Analysis ◽  
Difference Equation ◽  
Variable Thickness ◽  
Analogue Computer ◽  
Finite Difference Equation ◽  
Step Method ◽  
Electrical Analogue ◽  
Simply Supported ◽  
Laterally Loaded ◽  
Clamped Edges

Exact solutions of the full finite difference equation to the deflection of laterally loaded variable thickness plates are obtained by a step-by-step numerical method. A pure-resistance electrical analogue computer is used to perform the calculations. Certain mixed derivative terms which cannot be included conveniently in the analogue equations are represented as a modification to the load. The resultant step-by-step method converges rapidly to give results which differ from analytical values by less than 0.5 per cent. Plates with both simply supported and clamped edges are considered.

scholarly journals DISCUSSION. THE ANALYSIS OF A FOUR-SPAN SKEW BRIDGE USING AN ELECTRICAL ANALOGUE COMPUTER.

1967 ◽  
Vol 37 (4) ◽  
pp. 819-835
Author(s):  
C T HARNDEN ◽  
I P KING ◽  
J M SIDDAL ◽  
F SAWKO ◽  
K R RUSHTON ◽  
...  
Keyword(s):  
Analogue Computer ◽  
Electrical Analogue ◽  
Skew Bridge

ASYMMETRY OF THE CONCENTRATION FRONT DURING MISCIBLE DISPLACEMENT IN POROUS MEDIA

1958 ◽  
Vol 36 (11) ◽  
pp. 1476-1482
Author(s):  
A. E. Scheidegger ◽  
V. C. Larson
Keyword(s):  
Porous Medium ◽  
Porous Media ◽  
Boundary Conditions ◽  
Miscible Displacement ◽  
Analogue Computer ◽  
Constant Concentration ◽  
Electrical Analogue ◽  
Displacement Experiments ◽  
The Asymmetry ◽  
Diffusivity Equation

During many feasible experiments concerning miscible displacement in porous media, it has been noted that the concentration front is slightly asymmetric. It is possible that this is due to an asymmetry in the boundary conditions which is present in most practicable displacement experiments. The present paper endeavors to investigate the influence of asymmetric boundary conditions upon the shape of the concentration front: The diffusivity equation basic to the theory of miscible displacement has been solved for the case of injection of fluid of constant concentration at one end of a long, linear porous medium. The solution has been effected by an electrical analogue computer. Curves showing the asymmetry are given.

scholarly journals The Electrical Analogue Computer of Microtubule’s Protofilament

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
M. C. Ekosso ◽  
A. J. Fotue ◽  
S. C. Kenfack ◽  
H. Fotsin ◽  
L. C. Fai
Keyword(s):  
Differential Equation ◽  
Partial Differential Equation ◽  
Intracellular Transport ◽  
Dynamic Instability ◽  
Analogue Computer ◽  
Partial Differential ◽  
Analogue Circuit ◽  
Electrical Analogue ◽  
Damping Behavior ◽  
Theoretical Investigations

Microtubules as essential biopolymers implicated into electrical intracellular transport open a lot of questions about their intrinsic character of dynamic instability. Both experimental and theoretical investigations are used to understand their behavior in order to mimic and build powerful and smart biomaterials. So, in this paper, by analytical and computational approaches, we proposed an electrical analogue computer of microtubule’s protofilament drawing from the partial differential equation which describes microtubule’s motion. Using the computing elements, namely, operational amplifiers, capacitors, and resistors, we designed analytically the bioelectronic circuit of the microtubule’s protofilament. To validate our model, Runge–Kutta code was used to solve the partial differential equation of MT’s motion on software Matlab, and then, the results obtained are used as a controller to fit and validate numerical results obtained by running the bioelectronic circuit on software PSpice. It is shown that the analogue circuit displayed spontaneous electrical activity consistent with self-sustained electrical oscillations. We found out that two behaviors were exhibited by the voltage generated from the electrical analogue computer of MT’s protofilament; amplification and damping behaviors are modulated by the values of the resistor of the summing operational amplifier. From our study, it is shown that low values of the resistor promote damping behavior while high values of the resistor promote an amplification behavior. So microtubule’s protofilament exhibits different spontaneous regimes leading to different oscillatory modes. This study put forward the possibility to build microtubule’s protofilament as a biotransistor.

The Effect of Cutoffs on the Uplift Pressure Beneath the Hydraulic Structures Floor

2018 ◽  
Vol 6 (3) ◽  
pp. 20-28
Author(s):  
Faisal Al Tabatabaie ◽  
Dhabia Sabeeh Al Waily
Keyword(s):  
Potential Energy ◽  
Hydraulic Structure ◽  
Hydraulic Structures ◽  
Outer Face ◽  
Analogue Model ◽  
Electrical Analogue ◽  
Uplift Pressure ◽  
Different Depths ◽  
The Stability ◽  
Critical Sections

The use of cutoffs underneath the hydraulic structures is considered a safe solution to ensure the stability of hydraulic structure against uplift pressure and piping phenomenon in addition to the sliding and overturning forces of the water. These cutoffs are used at critical sections underneath the floor of hydraulic structure to substitute with their depths the horizontal lengths of the creep line of the hydraulic structure base. In this paper, the experimental method- by using electrical analogue model- was carried out to plot the flow net and study the efficiency of the front and rear faces of the cutoffs for dissipating the potential energy of the percolating water underneath the floor of hydraulic structure. An electrical analogue model which was used in this study consists of twenty five models with different depths of upstream and downstream cutoffs. After plotting the flow net for all models, it is concluded that the efficiency of the inner sides are less than that of the outer sides which were investigated before in this topic of this work that both faces reduction values in the uplift pressure are considered the same, where the efficiency of the outer face of upstream cutoff is (70.35) % and for the inner face is (29.64)%, while for the downstream cutoff the efficiency for the outer face is (76.21)% and for the inner face is (23.79)% .

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