The feeling of life in the modern small partners, ah, nothing can be, that is, no net no electricity, electricity, a good solution to the problem, it is sufficient to buy a card to buy, and the problem of the network can really be a headache. Like many of the friends who built Wi-Fi in their homes/bedrooms, they often encounter network problems but they are unable to get online. No, these days, our editorial department has also appeared on a large scale... To put it simply, computers in the LAN cannot access the Internet. Most of them are caused by the computer's inability to obtain the correct IP address or the router/switch cannot allocate addresses. When this type of problem is encountered, the first step is to restart the router/switch. , and then restart the computer. OK, the first step is done. If it still doesn't work, we must enter the next stage. We can use the command prompt to enter ipconfig /release to release the IP address used by the computer's network card. Then refresh with ipconfig /renew, basically OK. You can't say it, that is, the system does not have the ability to automatically obtain the address of the router. Simpler, first check the information such as the IP address segment of the LAN and the DNS server through other devices that can access the Internet. The simplest method is to use a mobile phone to connect. Wi-Fi or other computer using the command prompt IPconfig command to view, After that, under the "Internet Protocol Version 4 (TCP/IPv4) Properties" under the network interface setting of the network, manually fill in the relevant information such as the IP address, DNS server, and so on. The most final and most reinstalled system or reset the router's big move, I hope you will not use it.
Polymethyl methacrylate (polymethyl methacrylate, also known as acrylic or plexiglass), is also known as Agali glue in Hong Kong. It has the advantages of high transparency, low price, and easy processing. It is a commonly used glass substitute material . The polymethyl methacrylate monomer is methyl methacrylate (MMA, acrylic monomer). Excellent transparency and excellent aging resistance; its ratio is less than half of ordinary glass, but its resistance to fragmentation is several times higher. It has good insulation and mechanical strength, and has strong resistance to acids, alkalis, and salts. It is corrosive and easy to process. It can be glued, sawed, plane, drilled, engraved, polished, screen printed, sandblasted and other manual mechanical processing. After heating, the pressure mold can be bent into various acrylic products.
Fresnel Lens is equivalent to infrared and visible light convex lens in many cases, the effect is better, but the cost is much lower than ordinary convex lens. It is mostly used in occasions where accuracy is not very high, such as slide projectors, film magnifiers, infrared detectors, etc.
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The Fresnel lens has two functions: one is focusing, that is, the pyro-infrared signal is refracted (reflected) on the PIR, and the second is to divide the detection area into several bright and dark areas, so that it can enter the detection area A moving object can produce a changing pyro-infrared signal on the PIR in the form of a temperature change.
