Research progress on infrared and radar compatible stealth materials based on metamaterials. The use of various reconnaissance and detection methods to achieve battlefield transparency is a fundamental characteristic of modern information-based warfare. Infrared detection and radar detection are widely used in the battlefield, which has made infrared and radar compatible stealth technology a research focus in adversarial detection. Compared to traditional infrared and radar compatible stealth materials, new infrared and radar compatible stealth materials based on metamaterials exhibit superior performance.

       Last year, the energy storage industry experienced a rollercoaster like market treatment, from being a darling of capital to facing an awkward situation of "excess at the beginning". Even many players have not received any dividends and have directly entered the game of "blood sea". However, in reality, there is still a shortage of key components in some energy storage systems.

       1.PCB design process: 1. Prepare component library and schematic diagram in the early stage< br> 2. PCB structure design, this step is based on the determined circuit board plane dimensions and various mechanical positioning< br> 3. PCB layout, ensure the correctness of the schematic before layout, and check the power network, ground network, etc. after the schematic is drawn. Simply put, layout means placing components on the board.

       Encapsulation is the basic layout of PCB, including electrical and mechanical connections. Display the electrical and component outlines as well as the component pins connected to the PCB. At the same time, the area on both sides of the PCB should be considered< br> The selection of components and the size of the PCB are interdependent. Therefore, when selecting the correct components for rigid flexible printed circuit boards (PCBs) or other types of PCBs, the footprint of the PCB must be considered.