2011 China's automobile engine problem topped the list

Recently, Carren.com, the only tracker of quality and service for automotive products of the National Users Committee of the China Quality Association, published the 2011 China Automotive Product Quality and Service Complaint Analysis Report (hereinafter refer

Alarm system with stop function in the future is the future development trend

As an indispensable part of the security system, the alarm system always stands at the forefront of the security industry with its unique space and environmental detection and prevention technology and the timeliness of protection. The anti-theft alarm system started in the late 1980s in Chin

Cable cabling knowledge details

Optical fiber has been widely used in various transmission networks as a high-bandwidth and high-security transmission medium. Due to the high cost of cables and equipment, most of the fiber is used only for the network backbone, that is, the system wiring for the vertical backbone subsystem

Re-selection of the basic principles (2)

This shows that the fact that a wide level can be sorted under interference and sedimentation conditions. Although it is one step ahead of the above theory, it is still difficult to make reliable calculations because the values ​​of θ 1 and θ 2

Zhejiang University Task Force found the ultra-fast optical switch

The optical properties of any material can be derived from its dielectric constant. We know that the permittivity of dielectrics is greater than 0, while the permittivity of metal is less than zero. When the dielectric constant of a material approaches 0, there are many wonderful