SAND PILE AS A UNIVERSAL COMPUTER

1996 ◽  
Vol 07 (02) ◽  
pp. 113-122 ◽  
Author(s):  
ERIC GOLES ◽  
MAURICE MARGENSTERN
Keyword(s):  
Computer Program ◽  
Logic Gates ◽  
One Dimensional ◽  
Sand Pile ◽  
Pile Model

We show that the sand pile model is able to simulate, by specific configurations, logic gates and registers and, therefore any computer program. Further, we give its interpretation in terms of a set of several one-dimensional interacting avalanches.

Critical Behaviors in a Stochastic One-Dimensional Sand-Pile Model

2005 ◽  
Vol 44 (2) ◽  
pp. 316-320
Author(s):  
Duan-Ming Zhang ◽  
Hong-Zhang Sun ◽  
Zhi-Hua Li ◽  
Gui-Jun Pan ◽  
Bo-Ming Yu ◽  
...  
Keyword(s):  
One Dimensional ◽  
Sand Pile ◽  
Pile Model

NAND/AND/NOT logic gates response in series of mesoscopic quantum rings

2019 ◽  
Vol 33 (34) ◽  
pp. 1950431 ◽  
Author(s):  
E. Dehghan ◽  
D. Sanavi Khoshnoud ◽  
A. S. Naeimi
Keyword(s):  
Current Density ◽  
Spin Current ◽  
Logic Gates ◽  
Nand Gate ◽  
Double Quantum ◽  
Device Performance ◽  
Quantum Rings ◽  
One Dimensional ◽  
Rashba Spin ◽  
In Series

There is a special class of logic gates, called universal gates, any one of which is sufficient to express any desired computation. The NAND gate is truly global, given that it is already known, each Boolean function can be represented in a circuit that contains only NOT and AND gates, it is sufficient to show that these gates can be defined from the NAND gate. The effect of Rashba spin-orbit interaction (SOI) on the gate response and spin current density in a series of non-interacting one-dimensional rings connected to some leads is studied theoretically within the waveguide theory. The gates response and spin current density are computed in geometry of the system containing two terminal double quantum rings. Also, the presence and absence of Rashba SOI are treated as the two inputs of the AND/NAND/NOT gates. Furthermore, simulation of the device performance demonstrates that vital improvement toward spintronic applications can be achieved by optimizing device parameters such as magnetic flux and Rashba coefficient.

A Study of the Behaviour of Joints

1992 ◽  
Vol 7 (3) ◽  
pp. 211-217 ◽  
Author(s):  
H.L. Zhao ◽  
J. Ma ◽  
S.R. Yan
Keyword(s):  
Computer Program ◽  
Nonlinear Analysis ◽  
Close Agreement ◽  
Experimental Results ◽  
One Dimensional ◽  
Loading Tests ◽  
Plastic Theory

The present paper describes the behaviour of three types of joints based on the elasto-plastic theory. A computer program has been developed to perform materially nonlinear analysis of these nodes. One-dimensional loading tests are also described and close agreement between the analytical and experimental results is achieved.

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