Ashby was an engineer interested in nonlinear control circuits and the virtues of positive feedback loops.

阿什比是一位工程师，他对非线性控制电路和主动反馈回路的优点感兴趣。

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The artificial leaf — a silicon solar cell with different catalytic materials bonded onto its two sides — needs no external wires or control circuits to operate.

人造叶子实际上是两边分别胶合了不同材料的催化剂的硅太阳能电池，因此不需要外部导线或者控制电路来操控。

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They integrated miniature antennas, control circuits, an LED and radio chips into the lens using optoelectronic components they built from scratch.

他们使用自己从零开始制造的光电子元器件，将微型天线、控制电路、一块LED和无线芯片集成到隐形眼镜中。

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Ephrins are believed to control the growth of nerve cells necessary to help form proper circuits within the spinal cord.

BBC: Discovery prompts spinal cord hope

Adding cape plug-in boards to the popular and expandable BeagleBone computer that is used as a development kit allows hobbyists and developers to quickly and easily augment BeagleBone's capabilities with LCD screens, motor control and battery power as well as the ability to create their own circuits.

ENGADGET: BeagleBone gets plenty of expansion options with new 'cape' add-ons

Dr Lin is already testing a waveguide designed to steer light with a wavelength of 1.5 microns, and he is also working on three-dimensional waveguides made of silicon, which will provide almost total control over the path the light takes, and make really complex optical circuits possible.

ECONOMIST: New-age crystals