The whole system of multi-point soil temperature and humidity recorder consists of two parts, the soil temperature and humidity data acquisition subsystem and the remote monitoring and receiving subsystem, as shown in Figure 1. The system has the functions of querying, storing, regularly reporting and warning (fire or flood) of soil temperature and humidity. The on-site data acquisition subsystem consists of a data acquisition module, a CDMA module, and a power module. The monitoring and receiving subsystem consists of a server, a display control computer, and a monitoring server.
Data acquisition subsystem software mainly includes operating system migration module, main program design module and A/D conversion program design module. Because the soil monitoring requires real-time, this design will transplant the embedded operating system with better real-time to the S3C44B0X. The system is required to complete the hardware initialization of the S3C44B0X in the main function, and then initialize the various operating system modules. The operating system has a total of three task modules, namely the main task (sensor data acquisition), CDMA communications, GPS positioning and data acquisition. Among them, the main task has the highest priority level, and data collection, processing, and transmission are performed every 4 hours.
The multi-point soil temperature and humidity recorder uses the embedded processor as the core of the data acquisition subsystem to develop the monitoring program for the acquisition subsystem. Using CDMA1X network and Internet as the carrier to send data to the remote monitoring center, remote monitoring of forest soil parameters was realized. According to actual needs, the relevant modules in the system can be cut or the sensor of the acquisition subsystem can be changed. It can also be used in other fields of environmental monitoring and has a wide range of application prospects.
Curing agents, also known as hardeners, are essential components of many polymer systems, including Epoxy Resins. Curing agents react with the epoxy resin to form a three-dimensional crosslinked network, resulting in a cured polymer with improved mechanical properties, chemical resistance, and thermal stability.
There are several types of curing agents, each with its own unique properties and applications. The most common type is amine-based curing agents, which react with the epoxy functional group to form a secondary amine and an alcohol. This reaction is exothermic and can be accelerated by heat, making it ideal for high-temperature applications.
Another type of curing agent is anhydride-based, which react with the epoxy group to form a cyclic acid anhydride and a hydroxyl group. These curing agents are typically used in applications where water resistance is critical, such as marine coatings and adhesives.
Other types of curing agents include phenolic, acid, and catalytic curing agents. Phenolic curing agents are used in high-temperature applications, while acid curing agents are used in low-temperature applications. Catalytic curing agents are used to accelerate the curing process and are typically used in combination with other curing agents.
The choice of curing agent depends on the specific application requirements, such as cure time, cure temperature, and final properties of the cured polymer. It is important to choose the correct curing agent to ensure that the final product meets the desired specifications.
In summary, curing agents are essential components of many polymer systems, including epoxy resins, and play a critical role in improving the mechanical, chemical, and thermal properties of the cured polymer. The choice of curing agent depends on the specific application requirements and must be carefully considered to ensure the final product meets the desired specifications.
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