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A proton-exchange membrane, or polymer-electrolyte membrane (PEM), is a semipermeable membrane generally made from ionomers and designed to conduct protons while acting as an electronic insulator and reactant barrier, e.g. to oxygen and hydrogen gas.
Over the last year, the CPI rose 3.5 percent, up from 3.2 percent for the 12 months ended in February. Shoppers are feeling the pinch. A 2023 Bankrate survey found that 52 percent of U.S. adults ...
With Diffie-Hellman key exchange, two parties arrive at a common secret key, without passing the common secret key across the public channel. Diffie–Hellman (DH) key exchange is a mathematical method of securely exchanging cryptographic keys over a public channel and was one of the first public-key protocols as conceived by Ralph Merkle and named after Whitfield Diffie and Martin Hellman.
A hot, less-dense lower boundary layer sends plumes of hot material upwards, and cold material from the top moves downwards. Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy ( heat) between physical systems. Heat transfer is classified into various mechanisms ...
Heat exchanger. A heat exchanger is a system used to transfer heat between a source and a working fluid. Heat exchangers are used in both cooling and heating processes. [1] The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. [2]
The company's market cap stood at $2.15 trillion in early afternoon trading on Friday. Alphabet stock was up roughly 10% during the session. Revenue, excluding traffic acquisition costs, rose 16% ...
Đổi Mới ( IPA: [ɗo᷉i mə̌ːi]; transl. "renovation" or "innovation") is the name given to the economic reforms initiated in Vietnam in 1986 with the goal of creating a "socialist-oriented market economy". The term đổi mới itself is a general term with wide use in the Vietnamese language meaning "innovate" or "renovate".
Ion exchange is a reversible interchange of one species of ion present in an insoluble solid with another of like charge present in a solution surrounding the solid. Ion exchange is used in softening or demineralizing of water, purification of chemicals, and separation of substances. Ion exchange usually describes a process of purification of ...