There is a "bad news" for the driver. Beijing's "electronic police" is being upgraded. The new "electronic police" not only has keen "vision" but also the "mind" of analysis and judgment. The integrated multi-functional "electronic police" developed by Zhongguancun high-tech enterprise Beijing Wen'an Technology Co., Ltd., a camera can take into account three lanes, and can simultaneously identify more than five illegal acts such as illegal lane changing, rolling of vehicles, and retrograde. At present, the new type of "electronic police" has been "put on the job" in Fengti Road, Liujiayao Bridge South, and Dongzhimen Outer Street.
Wu Xinle, a technical staff member of the Beijing Wen'an Product Testing Department, is testing "electronic police" in front of his computer. On the screen, a real-time video of an intersection in Beijing is being played. There are three lanes on the screen. Traffic lights flash across and the traffic is bustling. Wu Xinle used a teacup-sized camera to "shoot" against the screen. "This simulation is the actual work of the 'electronic police' at the intersection," said Tao Hai, chairman of Beijing Wen'an.
Connected to the camera is a computer. The computer screen shows real-time road conditions. However, there is a yellow line between the lanes. Above each motorized vehicle, there is a red box to follow until the vehicle disappears. Outside the screen. This computer is actually the background of the "electronic police." "These yellow lines and red boxes are actually positioning the vehicles. Once illegal driving, they will be 'locked'," said Tao Hai.
In the video played by Wu Xinle, there was just a blue car that accelerated through the intersection at the red light and saw the computer screen on his desk. The car's license plate number, illegal time, and live photos were automatically one by one. Record archive.
In practice, the camera is connected to the back office with a 3G network. “The camera can be remotely controlled in the background. In addition to a camera chip and a central processing chip, the camera can process the shooting content, automatically perform traffic statistics and identify various illegal activities.†Tao Hai said that this is called "the electronic police system of the dual-core smart integrated machine" and the camera has 5 million pixels (the third version).
(Continued from the first edition) It is possible to identify more than five illegal acts such as illegal lane change at intersections, rolling of vehicles, retrograde, abnormal parking, and occupation of emergency lanes. This "one-many-more capable" "electronic police" is the first product created by Wen An Technology.
Tao Hai said that the installation of old traffic violation cameras usually requires digging pits, poles, and wires. To capture the red light, a traffic light detector needs to be installed, and then a coil called a “trigger line†is buried in front of the intersection. Once the vehicle rolls over the trigger coil, the camera shoots. At the same time, traffic junctions are usually equipped with equipment boxes to control "electronic police" equipment. Photographs taken need manual judgment, confirmation, and the number of the license plate.
“Simply speaking, traditional cameras can only shoot and look, which is equivalent to the eyes. Our scientific research results are equivalent to installing a 'mind' to the camera, allowing the camera to read the images on its own and automatically identify the video images. "People, cars or other target objects of the problem." Tao Hai said that with the "brain", the camera has the functions of license plate recognition, personnel and vehicle statistics, trajectory tracking, and abnormal behavior monitoring alarms.
The core of this "mind" is computer identification technology.
In order to allow computer identification technology to get out of the laboratory, Tao Hai gave up his position as a tenured professor at an American university and returned to Beijing to establish Beijing Wen'an. The employees initially had only 10 people but the results were one by one:
In 2005, the company was established and developed a license plate recognition system with the highest recognition rate in China.
In 2006, the industry’s first company launched a standard-definition red light electronic police system that relied on video triggering, and was used in Beijing on a large scale.
In 2008, the first domestic video streaming system based on the human body modeling was used to count the number of people through the camera. It was applied to 11 public parks in Beijing, Xidan Commercial Street, Dongzhimen Transport Hub, and Metro Line 9.
In 2010, the world’s first fixed 2 million-pixel high-definition smart one-in-one “E-police†with solar-powered, 3G wireless transmission captured many illegal activities such as emergency lanes; the same year, the world’s first company launched a bus installation. The mobile "electronic police" on the road has been used on a large scale in buses such as Ping An Avenue, Chang An Street, and Jing Tong Expressway.
After Wen'an’s scientific and technological achievements were successfully applied in Beijing, they were rapidly promoted to the whole country. "Electronic Police" has already been employed in one-third of provinces and cities in Tianjin, Shanghai, Shandong, Liaoning, etc., and the passenger flow statistics system has been applied in Shanghai Hongqiao Hub, Shanghai World Expo, Shenzhen Metro and other places.
Since 2008, the performance of Beijing Wen'an has grown rapidly, and its operating income has increased by 137% annually over the past three years.
The recently released “Transport Development and Construction Plan for Beijing during the Twelfth Five-Year Plan†proposes that by 2015, the city will build 3,000 new sets of fixed “electronic police†and 1,000 sets of mobile “electronic policeâ€. Tao Hai said that with the development of intelligent transportation, the future market potential of “electronic police†is even greater.
A ball check valve is a check valve in which the closing member, the movable part to block the flow, is a spherical ball. In some ball check Valves, the ball is spring-loaded to help keep it shut. For those designs without a spring, reverse flow is required to move the ball toward the seat and create a seal. The interior surface of the main seats of ball check valves are more or less conically-tapered to guide the ball into the seat and form a positive seal when stopping reverse flow.
Ball check valves are often very small, simple, and cheap. They are commonly used in liquid or gel minipump dispenser spigots, spray devices, some rubber bulbs for pumping air, etc., manual air pumps and some other pumps, and refillable dispensing syringes. Although the balls are most often made of metal, they can be made of other materials, or in some specialized cases out of artificial ruby. High pressure HPLC pumps and similar applications commonly use small inlet and outlet ball check valves with both balls and seats made of artificial ruby, for both hardness and chemical resistance. After prolonged use, such check valves can eventually wear out or the seat can develop a crack, requiring replacement. Therefore, such valves are made to be replaceable, sometimes placed in a small plastic body tightly-fitted inside a metal fitting which can withstand high pressure and which is screwed into the pump head.
There are similar check valves where the disc is not a ball, but some other shape, such as a poppet energized by a spring. Ball check valves should not be confused with Ball Valves, which is a different type of valve in which a ball acts as a controllable rotor to stop or direct flow.
A diaphragm check valve uses a flexing rubber diaphragm positioned to create a normally-closed valve. Pressure on the upstream side must be greater than the pressure on the downstream side by a certain amount, known as the pressure differential, for the check valve to open allowing flow. Once positive pressure stops, the diaphragm automatically flexes back to its original closed position.
A swing check valve or tilting disc check valve is check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. The seat opening cross-section may be perpendicular to the centerline between the two ports or at an angle. Although swing check valves can come in various sizes, large check valves are often swing check valves. The flapper valve in a flush-toilet mechanism is an example of this type of valve. Tank pressure holding it closed is overcome by manual lift of the flapper. It then remains open until the tank Drains and the flapper falls due to gravity. Another variation of this mechanism is the clapper valve, used in applications such firefighting and fire life safety systems. A hinged gate only remains open in the inflowing direction. The clapper valve often also has a spring that keeps the gate shut when there is no forward pressure. Another example is the backwater valve (for sanitary drainage system) that protects against flooding caused by return flow of sewage waters. Such risk occurs most often in sanitary drainage systems connected to combined sewerage systems and in rainwater drainage systems. It may be caused by intense rainfall, thaw or flood.
A stop-check valve is a check valve with override control to stop flow regardless of flow direction or pressure. In addition to closing in response to backflow or insufficient forward pressure (normal check-valve behavior), it can also be deliberately shut by an external mechanism, thereby preventing any flow regardless of forward pressure.
A lift-check valve is a check valve in which the disc, sometimes called a lift, can be lifted up off its seat by higher pressure of inlet or upstream fluid to allow flow to the outlet or downstream side. A guide keeps motion of the disc on a vertical line, so the valve can later reseat properly. When the pressure is no longer higher, gravity or higher downstream pressure will cause the disc to lower onto its seat, shutting the valve to stop reverse flow.
An in-line check valve is a check valve similar to the lift check valve. However, this valve generally has a spring that will 'lift' when there is pressure on the upstream side of the valve. The pressure needed on the upstream side of the valve to overcome the spring tension is called the 'cracking pressure'. When the pressure going through the valve goes below the cracking pressure, the spring will close the valve to prevent back-flow in the process.
A duckbill valve is a check valve in which flow proceeds through a soft tube that protrudes into the downstream side. Back-pressure collapses this tube, cutting off flow.
A pneumatic non-return valve.
Multiple check valves can be connected in series. For example, a double check valve is often used as a backflow prevention device to keep potentially contaminated water from siphoning back into municipal water supply lines. There are also double ball check valves in which there are two ball/seat combinations sequentially in the same body to ensure positive leak-tight shutoff when blocking reverse flow; and piston check valves, wafer check valves, and ball-and-cone check valves.
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