Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract： The friction and wear behavior of the natural tooth enamel and dentin in sliding against a highly polished glass ceramic, polymer ceramic, zirconia and pure titanium respectively were investigated through a fretting friction and wear testing in an artificial saliva test environment by UMT-2 friction and wear testing machine. While the worn surface morphology was observed by scanning electron microscopy (SEM), the roughness was measured by roughness instrument and the abrasion loss was weighed by an electronic balance. The results show that after friction and wear testing, the abrasion loss of the enamel and dentin against the four kind of materials all showed a statistically difference within P < 0. 05, which possessed significant positive correlation with the hardness of the four kinds restoration materials, the enamel and the dentin. The mass loss of the dentin against poly ceramic and the enamel against glass ceramic was the closest ones to that of the control group of the dentin.
Subjects: Physics >> Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics Subjects: Information Science and Systems Science >> Basic Disciplines of Information Science and Systems Science Subjects: Mathematics >> Mathematics （General） submitted time 2017-11-26
Abstract： The infrared imaging grayscale variation caused by the influence of atmosphere on infrared radiation transmission is a problem that infrared target tracking application needs to cope with. The object of this paper is to model the law of infrared imaging grayscale variation in Lie group, which is important to design an efficient and robust target tracking algorithm. This paper firstly analyzes the infrared radiation transmission model, and then derives the brightness model of infrared imaging by considering the mechanism of infrared imaging. Furthermore, it is theoretically proved that the infrared imaging grayscale variation caused by the atmosphere obeys to the Lie group structure, and a non-Euclidean mathematical representation of the infrared imaging grayscale variation is proposed. Finally, according to the infrared imaging grayscale variation model, the field experimental data collected under different environments are fitted, and the regression analysis results demonstrate the correctness of the model, which validates the rationality of the Lie group representation of the infrared imaging grayscale variation.
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