Abstract.The research is explored an efficient methodology in parameter setting for RSW (resistance spot welding). The methodology mainly focusses on weld cycles and weld current, which has included a process for parameter selection, performance evaluation, and failure mode analysis. Effects on welding resistance caused by various technical parameters. Relationship between weld cycles, weld current and the mechanical performance will be established by simplified model. Also, the parameter setting of welding operation, inspection methods, failure modes and control system will be discussed in the … Read more →

Abstract.In order to accurately analyze the geological anomalies encountered in the tunnel of coal mine excavation, this paper uses ground penetrating radar to follow up and detect faults in front of coal excavation. Ground penetrating radar is a wide range of survey methods that can quickly cover large areas and locate gaps, while using other invasive methods to locate gaps is difficult and expensive. And the ground penetrating radar can infer details of the location of the fault and the length of the fault. Therefore, the manageability and non-invasive nature of ground penetrating radar makes it … Read more →

Abstract.With the rapid development of urban economy and the continuous increase of urban population, the discharge and improper disposal of a large number of industrial wastes, urban domestic garbage, sludge and other pollutants have led to the continuous accumulation of heavy metals in the soil, which has increased the pollution load of heavy metals in the soil, leading to the increasingly serious heavy metal pollution of urban topsoil in China. Heavy metal pollution of urban soil is one of the important indicators that can effectively reflect the status of urban environmental pollution. Therefore, … Read more →

Abstract.Surface defects are an inevitable problem in steel production and processing. To solve the problems of error detection, leakage detection and low accuracy of traditional manual methods for steel surface defect detection, this paper proposes a steel surface defect detection algorithm based on Faster RCNN, a classical model in the field of computer vision object detection. The proposed model uses ResNet50 as its backbone and introduces FPN to fuse the multi-layer feature maps of the backbone to improve the detection capability for defects of different scales. The experimental results on NEU-DET … Read more →

Abstract.A field experiment was conducted to analyze the changes of soil nutrients in mining area after different microbial plant combined remediation. The results showed that the application of microbial agents could significantly increase soil total nitrogen content in coal mine area. The contents of GH, GS and GX were the highest, which were 0.54, 0.51 and 0.41 g/kg, respectively. The contents of available phosphorus and available potassium in AX treatment were the highest, reaching 57.1 and 194 mg/kg. Comprehensive analysis showed that microbial agent + mixed seed mode could effectively increase … Read more →

Abstract.Northern Shaanxi coal mine is an important energy base in Shaanxi Province, the ecological environment of this area is fragile, facing the huge opportunity of mining development, in the current "environmental protection priority" reality, it is urgent to find out the environmental background of this area, support the development of national energy strategy. The results showed that the contents of Hg, Cd, Pb and Cr were higher than the background values of soil in Shaanxi province, and the average contents of As, Zn and Cu were lower than the background values of soil in Shaanxi Province, but … Read more →

Abstract.With the rapid development of science and technology, the requirements for absorbing materials in various fields are more and more high. SiC material, as a kind of absorbing materials, has a variety of excellent characteristics, and it is one of the key research absorbing materials. This experiment chose activated carbon powder and silicon powder to grow the SiC nanowires on the graphite paper. In the process, activated carbon atoms on the surface of the graphite paper and coarse porous structure are more likely to contribute to formation of SiC crystal nucleus. In addition, increasing the … Read more →

Abstract.The laboratory analyzed and determined the same type of forest soil samples at three content levels. The relative standard deviations of exchangeable acidity, exchangeable hydrogen and exchangeable aluminum in the soil were 2.26%, 2.31%, 1.72%, 10.06%, and 4.61%, respectively. %, 5.12%, 4.02%, 7.70%, 5.42%, and the actual samples were verified by the experiment, and the relative deviations of the parallel samples of exchangeable acidity, exchangeable hydrogen and exchangeable aluminum of soil samples were 1.30%, 1.03%, and 1.75%, respectively. All of them meet the determination requirements of … Read more →

Abstract.In the Southern Ocean, the biomass of Clione limacina is relatively large in some sea areas, and the largest biological density was found in the survey reached 300 Ind /m3. The acoustic data were obtained from the scientific fish finder (SIMRAD EK60) on Xuelong polar research vessel during China's 32nd Antarctic expedition. The system operated at a frequency of 38 and 120kHz. The acoustic data obtained from the expedition were processed in the specialized software used by the Institute for Underwater Acoustic Survey and Analysis of Biological Resources (ECHOVIEW 6.1.72, MYRIAX, AUSTRILIA). … Read more →

Abstract.Ibuprofen (IBU) was cocrystallized with nicotinamide (NIC), saccharin (SAC) and succinic acid (SUC) using solvent evaporation method and grinding method. Ibuprofen cocrystals were characterized by FTIR, XRD to analyze crystalline structure. Fluorescence spectrometer (FS) was also applied to verify the formation of ibuprofen cocrystals. The formation of IBU-NIC cocrystal, IBU-SAC cocrystal and IBU-SUC cocrystal were demonstrated by IR character peaks shift and new XRD character peaks. Solution method can produce IBU cocrystal with higher purity. The change of maximal fluorescence emission … Read more →

Abstract.Gold nanoparticles (AuNPs) were synthesized by one-step reduction of chloroauric acid using pomelo leaf polyphenol extract as reducing and protective agent. The AuNPs were characterized by UV-Vis absorption spectroscopy. Compared with AuNPs prepared with sodium citrate as reducing agent, AuNPs prepared with pomelo leaf polyphenol extract had better stability. The antioxidant properties of green-synthesized AuNPs were investigated by Bland-Williams method. The antibacterial activity of the green synthesized AuNPs was investigated by the transparent inhibition zone method and the minimum … Read more →