The appearance of urea is white, spherical particles, and it is easily soluble in water and liquid ammonia. When pure urea is heated to close to the melting point under normal pressure, it begins to show instability. If you put a clean iron sheet on the stove and put urea particles on it, you can see that the urea melts quickly and volatilizes, and at the same time a small amount of white smoke is emitted, and the smell of ammonia can be smelled. Ammonium chloride is white crystals with a slight yellowish color, strong water absorption, and easy to agglomerate. Put a small amount of ammonium chloride on the fire and heat it, you can smell a strong pungent odor, accompanied by white smoke, ammonium chloride will quickly melt and all disappear, in the process of melting, you can see the unmelted part is yellow. The appearance of ammonium bicarbonate is white or grayish crystals with an ammonia smell. It has strong hygroscopicity and is easily soluble in water, and the aqueous solution is weakly acidic. To easily identify ammonium bicarbonate, rub a small amount of sample with your fingers to smell the strong ammonia odor. The appearance of superphosphate is dark gray, off-white, and light yellow. It is an acidic chemical fertilizer. It is sensitive to the action of alkali and easily loses its fertilizer effect. One part is soluble in water, and the aqueous solution is acidic. Under normal circumstances, the hygroscopicity is small, such as when the air humidity reaches 80% or more, it will absorb moisture and form a hard block. The appearance of calcium-magnesium phosphate fertilizer is gray-white, gray-green or gray-black powder, which looks extremely fine. Under sunlight, shattered, glass-like objects are generally seen, shimmering, and no change is seen when heated on a fire. . The appearance of the compound fertilizer is a gray-brown or off-white granular product. When the compound fertilizer is heated on the flame, white smoke can be seen, and the smell of ammonia can be smelled, and it cannot be completely melted. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone
What is 4G PTZ WiFi Camera
Camera, also known as computer camera, computer eye and electronic eye, is a video input device, which is widely used in video conference, telemedicine and real-time monitoring. Ordinary people can also talk and communicate with each other through the camera on the network with video and voice. In addition, people can also use it for various popular digital images, video and audio processing.
The 4G intelligent camera, also known as 4G camera and IPC, is mainly used for security video surveillance. Its feature is that the 4G communication module is built into the universal surveillance camera, allowing the camera to be directly connected to the network through the base stations of the three operators, breaking the limitations of the original deployment of network cables or WIFI connection, so as to achieve the purpose of remote monitoring.
Professional 4G PTZ WiFi Camera manufacturer is located in China, including Full Color Night Vision Two Camera,Smart Wifi Zoom Cctv ,360 Degree Ip Wireless Camera, etc. 4G PTZ WiFi Camera,Full Color Night Vision Two Camera,Smart Wifi Zoom Cctv ,360 Degree Ip Wireless Camera,PTZ Outdoor Camera Shenzhen Fuvision Electronics Co., Ltd. , https://www.outdoorsolarcamera.com
At present, the functions of smart cameras mainly include video monitoring, voice dialogue, security alarm and video review.
Video surveillance
Video surveillance is the core and basic function. The current intelligence is that the mainstream resolution of cameras is 1080P HD, which requires a high level of network. Most home cameras transmit data through WiFi, which is convenient to move. Some stores also install such cameras, which are mainly used to monitor the main points such as the cash register. This kind of camera that does not need to move can use the network cable, and the signal will be more stable.
Voice conversation
Most cameras on the market are equipped with the function of voice conversation. Users can directly have voice conversations with their families through the APP. Of course, although many devices on the market support this function, noise elimination, uneven echo and other situations still occur frequently and need to be improved continuously.
Security alarm
The security alarm function is mainly used to record vibration, special noise and other vibrations, and alarm through APP.
Video review
At present, smart cameras on the market all provide the function of video review, but most of them only provide the function of alarm review, that is, the video recorded after the alarm occurs can be reviewed, and the rest of the time can not be viewed, and it is a paid function. Few manufacturers can provide uninterrupted video retrieval function. The reason is simple: the cost of video storage server is too high. Video belongs to large flow files. If you want to achieve uninterrupted recording, storage and review, the cost will be many times or even dozens of times higher.
4G intelligent camera
The deployment of wired network is troublesome or the coverage of WIFI is limited. For example, security monitoring of mature commercial offices or new indoor and outdoor blank areas in residential areas, video monitoring is required for outdoor construction sites, and 4G intelligent cameras are required for the deployment of wired network is troublesome and scattered.
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