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Science and Technology

Invention of SD Card

Invention of SD Card Invention of SD Card-In 1999, SanDisk, Matsushita, and Toshiba agreed to develop and market the Secure Digital (SD) Memory Card. The card was derived from the MultiMediaCard (MMC) and provided digital rights management based on the Secure Digital Music Initiative (SDMI) standard and for the time, a high memory density.  SanDisk Corporation (NASDAQ: SNDK), a global leader …

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How does High Pressure Sodium lamp works?

How does High Pressure Sodium lamp works? How does High Pressure Sodium lamp works? High-pressure sodium lamps are quite efficient—about 100 lm/W—when measured for photopic lighting conditions. The higher power versions of 600 W have an efficiency of 150 lm/W. They have been widely used for outdoor area lighting such as streetlights and security. Understanding …

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