BMW's blue and white logo symbolises the spinning propeller, which is a reflection of the company's early history. But said the current BMW chief is correct, people always think that blue and white logo is a propeller, it should be, BMW's headquarters in Munich, Bavaria, Germany and the Bavarian state flag is blue and white, BMW's name and the Bavarian engine company, BMW will represent the Bavaria, represents the most exquisite German engine technology.
Access control is often a system enabling authorities to manage access to areas and resources in a given physical facility or computer-based information system. Access control is, the truth is, a standard, everyday phenomenon. For example, a lock on a car door is essentially a type of access control. The PIN over a bank's ATM system is another kind of access control. Even nightclub bouncers, waiting in front of the door, are another instance of (perhaps) a far more primitive mode of access control. Using an access control mechanism is vital when persons look to secure confidential, important, or sensitive information and equipment.
The underground metal detector is made of advanced technology. It has the characteristics of wide detection, accurate positioning, strong resolution and easy operation. Metal detectors are mainly used to detect and identify metal objects buried underground. In addition to military applications, it is widely used in security inspection, archaeology and prospecting, and the search for scrap metal, which is also known as "iron probe", which is a good helper for waste recycling.
Gate management principles: 3.5 to 4.95 M by crystals of sinusoidal oscillation, dividing by the frequency divider is about 7.8 K sine wave, the triode power amplifier input after door plank with coil (7) large coil electromagnetic launch, by the gate 1-6 area to receive coil respectively. After receiving, the received signal are compared with those of the reference signal, found that after the change, change the acquisition card output level, the CPU in 300 milliseconds for 6 location data acquisition card scanned, determine the metal's location and output display
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