Liu Sheng: Comparison of copper wire and gold wire bonding processes in LED packaging
On the afternoon of October 15, 2010, at the 7th China International Semiconductor Lighting Exhibition and Forum, Liu Sheng, director of the Wuhan Institute of Optoelectronics National Laboratory and Microsystems Research Center of Huazhong University of Science and Technology, gave a title entitled "Copper and Gold in LED Packages" . Report of the comparison of wire bonding processes. Wire bonding is a key process in the LED packaging process. In the LED packaging process, the electrical connection between the LED chip and the package holder is mainly achieved by a pressure welding process. LED packaging companies generally use gold wire bonding, but gold wires are expensive, resulting in higher LED costs. Conversely, copper wire is inexpensive and has great potential for cost reduction. In the report, Professor Liu Sheng established a model by finite element method to analyze and compare the gold wire and copper wire bonding process in high-power LED package, and provide theoretical basis for copper wire bonding process parameter optimization. Mining is the process of creating a block of transactions to be added to the Ethereum blockchain in Ethereum's now-deprecated proof-of-work architecture.
Mining is the lifeblood of any proof-of-work blockchain. Ethereum miners - computers running software - used their time and computation power to process transactions and produce blocks prior to the transition to proof-of-stake.
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The word mining originates in the context of the gold analogy for cryptocurrencies. Gold or precious metals are scarce, so are digital tokens, and the only way to increase the total volume in a proof-of-work system is through mining. In proof-of-work Ethereum, the only mode of issuance was via mining. Unlike gold or precious metals however, Ethereum mining was also the way to secure the network by creating, verifying, publishing and propagating blocks in the blockchain.
Mining ether = Securing the Network