This article mainly describes the chemical and crystal structure of attapulgite as its unique crystal structure possess special physicochemical properties such as large specific surface area, adsorption performance, and cation exchangeability. By modification of attapulgite, such as
purification, high temperature roasting and other physical modification or acid–base salt modification, organic modification, surfactant modification and other chemical modification can further improve its physicochemical properties. In this article, the modification methods of two aspects
of physical modification and chemical modification are summarized, at the same time, the research progress and achievements of many scholars in attapulgite modification are reviewed. Through modified attapulgite the number of pores increased, channel become loose, pore diameter increases,
pore volume increases, interlayer spacing increases, specific surface area increases, chargeability and adsorption activity change, and the adsorption performance of attapulgite is greatly improved. Many scholars have applied modified attapulgite to the treatment of radionuclides, and achieved
remarkable results. It has been found that modified attapulgite has U(VI), Eu(III), Cs(III), Th(IV), both Eu(III) and Sr(II) have good adsorption properties, and the adsorption rate and adsorption capacity are greatly improved compared with the original soil. Based on the Summary of the attapulgite
modification method and its application in the treatment of radionuclide, some suggestions on the research and application of attapulgite modification and the possible key research directions in the future are further proposed.
With the development of economy, there are an increasing number of cars as well as traffic accidents, thus intensifying the need to take measures to reduce traffic accidents and protect the safety of life and property. Vehicle distance is one of the most important indexes of traffic safety. The measurement of safety vehicle distance has become an increasingly hot research area of intelligent transportation. Through analyzing the basic principle of stereo vision and calibrating the parameters of the CCD sensors both inside and outside, this paper comes up with a method to measure the former vehicle distance based on stereo vision and DSP. Once the vehicle speed and distance form a non-security association, it will give a warning, and upload data or force speed-limiting. According to the different coordinates of the obtained images of the target vehicle from the left and the right sensor, this method can identify feature points, calculate distance to the target vehicle, and analyze the security of vehicle distance. The experimental results show that this method has wide measurement range, high measurement accuracy, and fast operation rate, thus it can meet the actual needs of the measurement of safe vehicle distance in intelligent transportation.
When car is in the process of high-speed, the faults caused by tire pressure anomalies are the most worried and difficult to prevent for all drivers. It is one of the important reasons for the sudden traffic accidents. Tire pressure related to ride comfort, fuel consumption, tire wear and vehicle safety, so tire pressure’s monitoring has been one of the important research directions in the safe driving of vehicle. The anomalies of tire pressure made the vehicles appear to tilt and shorten the distance between rim centres and the ground. Using image technology can detect intuitively and fast. This paper measures the dynamic tire pressure based on image processing technology. The vehicles tires goal was extracted by three image differences. After morphological processing, it used three methods to make comprehensive analysis and judgement of whether the tire pressure is normal, to realize the automation and intelligence. This method had realized real-time non-contact detection for dynamic tire pressure, which has extended significance to popularize.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.