Transporting Lithium Batteries

Transported lithium-based batteries are divided into two types: lithium-ion found in mobile phones and laptops, and non-rechargeable lithium-metal used in medical devices and a number of consumer grade AA, AAA and 9V batteries.

The Internet of Bicycles

China’s homegrown “WeChat” application has nearly 900 million users. Need a car? Pay a check? Send someone some cash? Rate a dining venue? Make a video call? Send an endless series of silly emojis? WeChat is the platform, at least in China. It’s IM, Facebook, Tripadvisor and Skype all in one. And a gateway to to the Internet of Things.
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Absolute Safety

Recently, a colleague remarked to me, “Philosophically, of course, there is no such thing as absolute safety.” Could this be true? Is there a situation where a man could not possibly injure himself?
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Spectra of Digital Clock Signals

Reducing the duty cycle (the pulsewidth) reduces the low-frequency spectral content of the waveform, but does not affect the high-frequency content.