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A Captcha—a completely automatic public Turing test to tell computers and humans apart—is a test that humans can pass but computer programs cannot ; such tests are becoming key to defending e-commerce systems.Without them, spammers can, for example, write simple automated scripts to create hundreds of free e-mail accounts with a single command. The e-mail(More)
Efficient wireless energy transfer between two inductor-capacitor circuits has been demonstrated by applying the principles of Coupled Mode Theory to create a system of strongly-coupled, resonating magnetic fields. This paper makes a detailed analyzes how Coupled Mode Theory is used to increase energy transfer between two simple inductor-capacitor circuits.
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