منابع مشابه
Pulsed laser noise analysis and pump-probe signal detection with a data acquisition card.
A photodiode and data acquisition card whose sampling clock is synchronized to the repetition rate of a laser are used to measure the energy of each laser pulse. Simple analysis of the data yields the noise spectrum from very low frequencies up to half the repetition rate and quantifies the pulse energy distribution. When two photodiodes for balanced detection are used in combination with an op...
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Protecting against Credit Card Forgery with Existing Magnetic Card Readers
Existing magnetic cards adopt plain text to store confidential information, thus being vulnerable to an untrusted credit card reader or a skimming device. To tackle the problem, researchers have proposed many solutions such as integrated circuit card (IC card) and mobile wallets applications [6, 9, 12, 20, 21]; however, none of them can support existing magnetic card readers thereby facing sign...
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E-commerce customers may have a problem when paying for the purchase of a major item, if its price is larger than the available credit on their credit card. In the brick and mortar world, this problem would be solved by paying part of the bill with cash or with a second credit card. In e-commerce, however, this has not been an option. Furthermore, even when a customer could pay the whole purcha...
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ژورنال
عنوان ژورنال: British Journal of Ophthalmology
سال: 1992
ISSN: 0007-1161
DOI: 10.1136/bjo.76.5.317