Can you believe it? A fist-sized mesh bag, when placed in a pool of gold salt solution overnight, can absorb dozens or even hundreds of grams of gold, and the secret lies in the specially made mesh bag. Astonishingly, seven workers stole 8 kilograms of gold over a year, netting over 2 million yuan. This … Read more
Metal is applied to exposed pads using an organic coating, known as surface treatment. The surface finish protects copper pads from scratches and oxidation while facilitating soldering in a reflow oven. Although there are various types of surface treatments, ENIG and ENEPIG are two common types. Manufacturers typically use them for ceramicPCBs, flexible boards, and … Read more
This article is an excerpt from a book produced by Zhihu: “Cats, Einstein, and Cryptography: Quantum Communication That I Can Understand” From Julius Caesar to Sherlock Holmes from Nazi leader Hitler to the father of AI, Turing… How did the ultimate code in the field of communication come into being? All of this must start … Read more