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arXiv 1204.5345nlin.PScs.CL
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可激发介质中信息处理的时变波选择

Time-dependent wave selection for information processing in excitable media

University of the West of England(西英格兰大学)

William M. Stevens, Andrew Adamatzky, Ishrat Jahan, Ben de Lacy Costello

摘要:

我们展示了一种改进的技术,用于实现光敏感的化学可激发介质中的逻辑电路。该技术利用波在基于Belousov-Zhabotinsky反应的可激发介质中沿着限定通道的恒定速度传播,以及碰撞波的相互湮灭。这项工作与以前在这一领域的工作的区别在于,通道在交界处相遇的区域可以周期性地在允许波传播和阻止波传播之间交替。这些瓣膜状区域用于基于波从一个瓣膜传播到另一个瓣膜所花费的时间长度来选择波。在一个实验性的实现中,组成电路布局的通道由连接到计算机的数字投影仪投影。可兴奋通道被投影为暗区,不可兴奋区域被投影为亮区。阀在黑暗和光明之间交替:每个阀具有相同的周期和相位,占空比为50%。该方案可用于基于OR和AND-NOT操作的组合来制造逻辑门,具有很少的几何约束。因为几乎没有几何约束,所以可以实现紧凑的电路。给出了一个4位输入、2位输出整数平方根电路的实验结果。这是迄今为止在BZ可激发介质中实现的最复杂的逻辑电路。

英文摘要:

We demonstrate an improved technique for implementing logic circuits in light-sensitive chemical excitable media. The technique makes use of the constant-speed propagation of waves along defined channels in an excitable medium based on the Belousov-Zhabotinsky reaction, along with the mutual annihilation of colliding waves. What distinguishes this work from previous work in this area is that regions where channels meet at a junction can periodically alternate between permitting the propagation of waves and blocking them. These valve-like areas are used to select waves based on the length of time that it takes waves to propagate from one valve to another. In an experimental implementation, the channels which make up the circuit layout are projected by a digital projector connected to a computer. Excitable channels are projected as dark areas, unexcitable regions as light areas. Valves alternate between dark and light: every valve has the same period and phase, with a 50% duty cycle. This scheme can be used to make logic gates based on combinations of OR and AND-NOT operations, with few geometrical constraints. Because there are few geometrical constraints, compact circuits can be implemented. Experimental results from an implementation of a 4-bit input, 2-bit output integer square root circuit are given. This is the most complex logic circuit that has been implemented in BZ excitable media to date.

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