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Your search keyword '"Xu, Qing"' showing total 91 results
Start Over Author "Xu, Qing" Journal applied mechanics and materials
91 results on '"Xu, Qing"'

1. Risk Analysis of Environmental Pollution by Secondary Hydrogen Chloride from Leakage of Phosphorus Trichloride

Author

Li Zhang, Xu Qing Liu, Hao Yuan, and Ya Yun Li

Subjects
Smoke, Pollution, media_common.quotation_subject, Emission standard, Environmental engineering, Hydrochloric acid, Environmental pollution, General Medicine, chemistry.chemical_compound, chemistry, Environmental science, Phosphorus trichloride, Hydrogen chloride, Leakage (electronics), media_common
Abstract

This study aims to analyse the influence of the pollution of hydrogen chloride which is the side effect of the leakage accident of a 50m3 phosphorus trichloride tank. When the leakage source intensity is 1.06kg/s with the leakage time of 30 minutes, and the distance is about 2700m away from the highest allowable concentration (0.05mg/m3) in air of residential areas, which goes beyond about the distance of 700m over the "Comprehensive emission standard of air pollutants" (GB16297-1996) table 2 (100mg/m3, new sources of pollution emission limits), however, the mean value of hydrogen chloride concentration beyond 400m is less than the that of IDLH (immediately dangerous to life or health concentration), and no half lethal concentration (LC50) appears. The scope and extent of pollution can be significantly reduced by timely using fire water to eliminate smoke to change hydrogen chloride into hydrochloric acid fog and make them drop in a lower position.

Published
2014

2. The Law of the Residual COD in Distilled Spirit Wastewater after Two Stages of Biochemical Treatment

Author

Chao Liu, Ya Yun Li, Li Zhang, Hao Yuan, and Xu Qing Liu

Subjects
High concentration, Wastewater, Chemistry, Environmental engineering, General Medicine, Raw water, Residual, Pulp and paper industry, Anaerobic exercise, Effluent, Two stages, Flavor
Abstract

Based on the tests of the high concentration organic wastewater from the sampling of Maotai flavor liquor enterprises in Chishui River Basin after two stages of biochemical treatment, this study found out the residue COD concentration range and investigated the rules of its formation. Under anaerobic conditions,the inert COD (SI) were measured.The experimental results showed that: the anaerobic retention time was 48 hours and the COD concentration of the effluent after aerobic biological treatment was about 300~350mg/L, the residual BOD5accounted for 1~2%, the difficult to degrade in raw water COD accounted for 28~33% and SMP accounted for 65~73%. In conclusion, the research findings can provide a scientific justification for the depth treatment process of liquor wastewater to reach the standard.

Published
2014

3. Research on Racing Loss of a High-Power Hydraulic Retarder

Author

Hai Ji, Yun Hu Wang, Hui Yuan Li, Chao Wu, and Xu Qing Qin

Subjects
Mechanism (engineering), Engineering, Cfd simulation, Power loss, business.industry, General Medicine, Computational fluid dynamics, Retarder, business, Automotive engineering, Power (physics)
Abstract

This paper aims at the requirement of tracklayer gearing controlling racing power loss (for short racing loss), analyzed mechanism of generating racing loss of a high-power hydraulic retarder. By adding different number of baffle-plate equipment, racing loss was reduced. Using CFD technology, this paper studied contrastively the racing loss of hydraulic retarder in different condition, and compared with experiment result. The result indicated that the racing loss reduced obviously after fixing baffle-plate equipment, and the CFD simulation results agree well with the experimental results.

Published
2014

4. Information Extraction of High-Resolution Remotely Sensed Imagery Based on Object-Oriented Method

Author

Xu Qing Zhang, Fu Lei Zhan, Tian Qi Tang, Xue Feng Niu, Peng Shao, and Guo Dong Yang

Subjects
Object-oriented programming, Pixel, Basis (linear algebra), business.industry, Computer science, High resolution, General Medicine, computer.software_genre, Information extraction, Thematic map, Segmentation, Computer vision, Satellite imagery, Artificial intelligence, business, computer
Abstract

In this study, on the basis of pixel-based classification, object-oriented classification method was used to extract information from high resolution satellite imagery. Select the Binhai New Area as the study area,World View-2 data was selected as data sources, the rule sets of information extraction developing were established firstly, then the parameters of imagery segmentation and classification were tested repeatedly to achieve building hierarchies and map elements. The results showed that object-oriented information extraction method was feasible, and the extracted information was used to produce thematic map on the ArcGIS platform.

Published
2014

5. Dynamic Testing at High Strain Rates of AZ31 Magnesium Alloys on SHPB Equipment

Author

Xu Qing Chang and Tie Hua Ma

Subjects
Stress (mechanics), Yield (engineering), Materials science, Strain (chemistry), Metallurgy, General Medicine, Split-Hopkinson pressure bar, Slow strain rate testing, Strain rate, Strain hardening exponent, Deformation (engineering)
Abstract

The mechanical behaviour of as-cast AZ31 Mg alloy has been investigated at strain rates up to 2.0×103s-1. Dynamic tests were carried out at room temperature using a Split Hopkinson Pressure Bar (SHPB) apparatus. Microstructural characteristic were analysed by Image MAT A1 optical microscopy. The results demonstrated that AZ31 Mg alloy exhibited obvious yield phenomena and strain hardening behaviour at high strain rates. The basically same curvature of stress-strain curves exhibited an similar strain hardening rate. The dynamic yield strength changes little and the peak stress increases with the strain rates. An examination by optical microscopy after high strain rate deformation reveals the occurrence of twinning and twin area percentage increases with the strain rate increasing.

Published
2013

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