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Cuiping Li,Jiuqiang Han,Qibin Huang,Xiaoqiang Dong,Xuequan Ding,Yaming Ding,Dianguo Zhang,Ning Mu 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
It is very difficult to apply non-dispersive infrared sensor to detect the indoor air quality and maintain very low zero and temperature drift over long periods. Frequently manual zero setting and calibration are required. To solve the issues of zero and temperature drift of non-dispersive infrared sensor, a software model based on zero gas intensity, reference channels intensity, standard temperature, environmental temperature, temperature drift coefficient, etc. has been established to automatically modify and compensate the zero and temperature drift existing in the long-term continuous operation of the infrared sensor. The test result and long-term application indicate the detection precision of the instrument is less than 5%F.S in various changing environmental conditions. The average detection precision of carbon dioxide has been improved from 9.26% before comprehensive processing to 1.23% after processing, while the average detection precision of methane has been improved from 10.61% before comprehensive processing to 0.70% after processing. As a result, the disadvantages existing in many gas detectors including poor stability and short calibration cycle have been overcome, thus effectively improving the detection precision and stability of the instrument and reducing the maintenance cost.
Mechanical Properties and Microstructure of PVA Fiber Reinforced Cemented Soil
Xin Yao,Geng Huang,Mingming Wang,Xiaoqiang Dong 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.2
In this work, the experimental study of unconfined compressive strength tests, direct tensile strength tests and three point bending tests were carried out to evaluate the effect of PVA fiber reinforcement on the mechanical behaviour of cemented silty soil. In general, the addition of polyvinyl alcohol (PVA) fiber lead to an increase in compressive strength, and it was observed more significant improvement in tensile strength and flexural strength, moreover, the inclusion of fibers effectively altered the brittle failure pattern of unreinforced cemented soil and improve the toughness and ductility. In addition, the microstructural of interaction between fibers and cemented soil was investigated. The proposal of regression model was utilized for predicting compressive strength, tensile strength and flexural strength.
Li Juanfei,Wu Lei,Ma Mingyu,Song Ruifeng,Dong Chunhui,Wei Junfang,Li Jinsheng,Wang Xiaoqiang,Li Mingya 한국물리학회 2023 Current Applied Physics Vol.46 No.-
La0.7Sr0.3MnO3 (LSMO)/LaNiO3 (LNO) thin films were deposited successively on Si single crystal by the sol-gel method. The bipolar resistive switching (RS) behavior was studied in Al/LSMO/LNO devices. Obvious current hysteresis was observed, the set (reset) voltage and resistance ratio were modulated by the annealing temperature of LSMO thin films. At the annealing temperature of 750 ◦C, good endurance and retention performance were obtained in the memory device. According to the fitting results of I–V curves, based on Schottky emission model, the conduction mechanisms of Al/LSMO/LNO devices were discussed. Our results may give a valuable insight on developing perovskite-type rare earth manganese oxide.
Performance of a Composite Soil Prepared with Red Mud and Desulfurized Gypsum
Chongxian Suo,Hao Wen,Jiawei Cao,Hongyu Cao,Xiaoqiang Dong 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.1
Given the great environmental pressure brought by the massive stacking of solid waste, red mud and desulfurized gypsum were used to prepare cementitious materials. In this paper, three different material ratios with a 60% content at different curing ages (7 d, 14 d, and 28 d) were utilized to prepare the composite soil. To explore the performance of the composite soil, the resistivity, strain-stress, unconfined compressive strength, and pH of the composite soil were tested and analyzed, as well as the microscopic properties. The results show that the addition of solid waste can enhance the strength, while the optimal ratio of desulfurized gypsum to red mud is 2:2. The enforcement of strength comes from the hydration products. The main products of composite soil are hydrated calcium silicate gel or hydrated calcium aluminate gel and ettringite. In addition, the composite soils behave like a brittle material with peak stress and softening performance. In addition, the current frequency presents an obvious effect on the resistivity of composite soil, and the data at 50 kHz were recommended as the analytical data. Moreover, a positive connection exists between the strength and resistivity; therefore, the strength can be conveniently and expeditiously observed and predicted through the resistivity method in engineering.