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Wei, Wang
- Research on Feature Points Extraction Method for Binary Multiscale and Rotation Invariant Local Feature Descriptor
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Authors
Affiliations
1 School of Electron and Information Engineering, Ningbo University of Technology, CN
1 School of Electron and Information Engineering, Ningbo University of Technology, CN
Source
ICTACT Journal on Image and Video Processing, Vol 5, No 1 (2014), Pagination: 873-878Abstract
An extreme point of scale space extraction method for binary multiscale and rotation invariant local feature descriptor is studied in this paper in order to obtain a robust and fast method for local image feature descriptor. Classic local feature description algorithms often select neighborhood information of feature points which are extremes of image scale space, obtained by constructing the image pyramid using certain signal transform method. But build the image pyramid always consumes a large amount of computing and storage resources, is not conducive to the actual applications development. This paper presents a dual multiscale FAST algorithm, it does not need to build the image pyramid, but can extract feature points of scale extreme quickly. Feature points extracted by proposed method have the characteristic of multiscale and rotation Invariant and are fit to construct the local feature descriptor.Keywords
Features Extraction, Multiscale, Feature Descriptor, Corner Detection, Rotation Invariant.
- Ore Technical Characteristics and Ore Dressing Test of Low Grade Cu-Ni Ore in Huangshan Deposit, NW China
Abstract Views :159 |
PDF Views:143
Authors
Affiliations
1 No. 6 Geological Party, Xinjiang Bureau of Geology and Mineral Exploration and Development, Hami-839000, CN
1 No. 6 Geological Party, Xinjiang Bureau of Geology and Mineral Exploration and Development, Hami-839000, CN
Source
International Journal of Earth Sciences and Engineering, Vol 9, No 5 (2016), Pagination: 1972-1978Abstract
The grade of nickel and copper in Cu-Ni ore, which is the primary sulfide ore in Huangshan deposit in Hami, Xinjiang, is 0.39% and 0.26%, respectively. The dominating metal minerals in it are pyrrhotite, chalcopyrite, pentlandite, magnetite, while gangue minerals are steatite, serpentine, and carbonate. Without depriving steatite prior to mixed-selecting copper and nickel to transfer some suspensible steatite and serpentine into rough concentrate, a series of problems will occur, i.e. the productivity of middling will be high, the efficiency of concentration will be low, the amount of beneficiation reagent will be large, badly exacerbating flotation environment. During metal concentrates some suspensible steatite and serpentine can't be easily suppressed, causing the amount of magnesia high in nickel after separation. To reduce the influence of steatite and serpentine on selecting process, these minerals must be selected out first by good floatability.Keywords
Cu-Ni Sulfide Deposit, Magnesia, Low Grade, Ore Dressing Experiment, Xinjiang.Full Text
- Evaluation on Floor Water Inrush Danger of Weibei during Mining over Pressurized Water and Prevention Countermeasures to the Water Disaster
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Authors
Affiliations
1 Key Laboratory of Coal Resource Exploration and Comprehensive Utilization, Ministry of Land and Resources, Xi’an, Shaanxi, 710 006 ., CN
2 College of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi, 710 054., CN
3 Key Laboratory of Coal Resource Exploration and Comprehensive Utilization, Ministry of Land and Resources, Shaanxi Coalfield Geophysical Prospecting and Surveying Group Co. Ltd., CN
1 Key Laboratory of Coal Resource Exploration and Comprehensive Utilization, Ministry of Land and Resources, Xi’an, Shaanxi, 710 006 ., CN
2 College of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi, 710 054., CN
3 Key Laboratory of Coal Resource Exploration and Comprehensive Utilization, Ministry of Land and Resources, Shaanxi Coalfield Geophysical Prospecting and Surveying Group Co. Ltd., CN
Source
Journal of Mines, Metals and Fuels, Vol 66, No 4 (2018), Pagination: 231-244Abstract
With increasingly high comprehensive mining intensity to the coal resources and wider mining width of the mining area, the mines of Chenghe No.2 mineral are getting deeper and deeper and the hazard from the high pressure water of Ordovician limestone of #5 coal bed bottom is getting increasingly intense, which will seriously influence safety production of the mines. Therefore, how to liberate the under draught coal reserves of #5 water body is a difficult problem as well as the key issue to ensure safety production of the mines. As for this, the first author will combine with the hydrogeological condition of Chenghe No.2 mineral in this article, and adopt standardized water bursting coefficient method to evaluate the water insulation capability of Taiyuan formation #5 coal floor upon comprehensive analysis on influencing factors of floor water inrush, to consider whether to divide #5 coal floor under waterdiversion failing zone thickness into different compensated mining areas, having predicted water inrush probability of the mining area in the future, and to release the coal reserves threatened by Ordovician water disaster. The result shows: (1) Among the factors that influence #5 coal floor water inrush of Chenghe No.2 mineral, head pressure of the aquifer is motive power of water inrush, the floor strata lithology and its combination feature are safety barrier for confined water extraction, and geological structure is in most cases the channel of floor water inrush; in accordance with the latest stipulations on mine water prevention and control and design specifications on coal mine waterprevention, the first author takes 0.06MPa/m and 0.1MPa/ m as boundary conditions of critical water inrush coefficient, divides #5 coal floor water-resisting layer into compensated mining extremely dangerous zone, dangerous zone and exploitable zone; (2) As to areas that mining above the pressured water are inapplicable in consideration of the coal floor water-diversion failing zone, latest water bursting coefficient formula can be adopted to realize safe compensated mining, which has reduced danger of floor water inrush, and satisfied the requirements of safe compensated mining of this mining area; (3) Without considering condition of the water-diversion failing zone, it can liberate compressed coal reserves of #5 coal floor that are threatened by Ordovician limestone water disaster and enhance the recovery ratio of coal resources; (4) Based on the evaluation results of floor water inrush danger, the author has proposed major water disasters to the coal floor and prevention countermeasures, which has provided valuable reference for safety compensated coal mining above seam floor pressure-bearing water body of Chenghe minerals and even Weibei coalfield, brought tremendous social and economic benefits, is of practical significance for realization of green coal mining, and will drive local economic development, thus worth being generalized and applied.Keywords
Water inrush; evaluation; prevention; confined aquiferReferences
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