 |
A company called Oledcomm announced that ultra-fast wireless data transmission technology, known as "Li-Fi," will officially enter the market one year later.
The so-called Li-Fi, short for "Light Fidelity," was developed by the German physicist Harald Haas and became a topic in the 2011 TED talk. In simple terms, Li-Fi technology forms a unique binary code by changing the frequency of the lighting of the room lighting. As long as computers equipped with special sensors, smart phones, and other devices are exposed to such light, they can receive network signals.
In the introduction, it is only necessary to add a microchip to any of the obscure LED bulbs to control the blinking of millions of times per second, so that the light can be brought into the network. Because the blinking frequency of the LED light is too high, the human eye is completely undetectable. In this respect, this technology is more secure than traditional Wi-Fi.
Oledcomm claims that they already have Li-Fi technology and have achieved 3Gbps connection speed. With the continuous deepening of Haas research, its transmission speed is expected to reach 10Gbps. Due to its superiority, Li-Fi may eventually replace Wi-Fi.
Roller bearing, one of the two members of the class of rolling, or so-called antifriction, bearings (the other member of the class is the Ball Bearing). Like a ball bearing, a roller bearing has two grooved tracks, or races, but the balls are replaced by rollers. The rollers may be cylinders or truncated cones. Only radial loads (i.e., loads perpendicular to the axis of rotation) can be carried when the rollers are cylindrical, but with conical rollers both radial and thrust, or axial, loads (i.e., ones parallel to the axis of rotation) can be carried. A needle bearing has cylindrical rollers that are relatively slender and completely fill the space between the races; in many cases the inner race is dispensed with. Because there is line contact between a roller and the races, while in a ball bearing there is point contact, in a given space a roller bearing can carry a greater radial load than a ball bearing.
Roller bearings are used in all main shaft and auxiliary drive shaft applications to support pure radial load, and allow for axial shaft elongation due to temperature changes with no additional load effect on the bearing. They are usually located at the ends of the turbine and compressor shafts and are often mounted in a housing, but separated from it by a layer of pressurized oil known as a squeeze film damper.
In many cases, instead of having a separate inner race for roller bearings, the [inner race" is an integral part of the shaft or stub shaft. This reduces complexity, weight, and build-up of concentricity tolerances. Overall, this is cost effective, but the cost of replacement or repair is likely to be higher than for separate inner races.
Roller Bearing,Self-Aligning Roller Bearing,Double Row Roller Bearing,Neddle Roller Bearing
Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.longsbearings.com