WEBFeb 19, 2021 · In practice, the aircoupled antenna configuration in the target depth estimation needs to determine the airgap distance between the antenna module and the surface. In this study, the authors present an improved approach of estimating the antenna height for measuring thin to thick top coal layer using the highresolution algorithms.
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WEBSep 17, 2017 · To analyze the influence of movement in shallowburied working faces with large mining heights on mine pressure manifestation, the key stratum at a working face was egorised using the 1313 topcoal caving face with super great mining height under cover as a case study. The research combined theoretical analysis, field measurement, .
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WEBApr 1, 2024 · 2. Material and methods. The coal flow volume detection method based on TOF vision consists of three parts: image acquisition module, image processing module, and coal flow calculation module. In the image acquisition module, a TOF camera is used to capture depth images and grayscale images of the coal flow.
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WEBApr 1, 2000 · The pulsed radar has been developed and being used commercially extensively for the past two decades in many appliions in determination of the ice thickness (Walford,1985;Evans et al.,1988 ...
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WEBNov 3, 2023 · From the statistics of coal and coalbed methane exploration data, it can be seen that the average buried depth of the coal seam is m, the average buried depth of the coal seam is ...
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WEBNov 1, 2010 · Aldrich used machine vision systems to measure particle size distributions of coal on a conveyor belt (Aldrich et al. 2010). Zhang et al. proposed an efficacious method to estimate the density ...
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WEBSep 1, 2023 · A steel ruler is the simplest length measuring tool available, and it comes in four sizes: 150mm, 300mm, 500mm, and 1000mm. The following image shows a commonly used 150mm steel ruler. Steel rulers are used to measure the length dimensions of parts, but their measurement results are not very accurate. This is because the spacing .
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WEBMar 28, 2022 · The average thickness of the coal seam is m and the inclination angle is 2°–3°. The inclination length and strike length of the working face are 193 and 1406 m. The fullmechanized caving mining method is adopted, the mining height is m, and the coal caving height is m.
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WEBMar 1, 2024 · The landform is a hilly denuded plain with an altitude of 537–616 m and a relative height difference of about 30–50 m. ... and greater measurement depth. Consequently, the Wenner device was ...
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WEBMar 15, 2023 · Download Citation | Measurement of coalcarrying rate in gangue based on threedimensional image features and gray wolf optimizationsupport vector machine | To detect the coalcarrying rate in ...
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WEBMar 3, 2022 · Introduction. Underground coal mining often induces largescale damage to overburden and surface movement, further accelerating the occurrence of mine geological disasters such as water and sand burst under the condition of shallowseam mining (Kratzsch, 1983; Gray, 1990).The key to preventing water and sand burst is to reveal the .
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WEBDec 1, 2023 · The complex layered sample for simulating coal measure strata was prepared to perform the true triaxial fracturing experiment. • Multiple influences such as insitu stress, welltype, and injection rate were investigated to reveal fracture propagation and penetration behavior.. A new insight for understanding the fracture geometry and .
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WEBMay 16, 2022 · The gallery's width is usually kept between and m, for which a permit is required from DGMS. With the development of the continuous miner, the CMs are available for height to 6m height. The deployment of CM in any coal seam is possible for a height ranging between and 6 m, provided the permission is obtained .
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WEBJan 17, 2019 · The distance from the roof of the coal seam to the floor of the aquifer is m. The coal thickness is 21 m, but the design mining height is only 2 m, and many coal pillars were set up to prevent water inrush so that the recovery rate is only %, while the maximum water inflow of the panel is still as high as 245 m 3 /h. The cemented ...
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WEBApr 1, 2022 · The rebound height was H i (i = 1,2,3.), and the restitution coefficient can be obtained by H x / H i. To measure the rebound height accurately, the first rebound height is generally adopted for calculation, namely H x /H 1. In the calibration of the RC, H x equals 350 mm, and the rebound height with different RCs is shown in Figure 4.
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WEBMar 1, 2017 · The similarities between coal seams and shale gas reservoirs, including existence of a dual porosity system, diffusion in matrix and Darcy flow in cleats/fractures, sorption/desorption of gas, and ultralow permeability in matrix make the developed method applicable to coal. We report measurements of the 1D bulk diffusion coefficient of a .
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WEBA standard front load washer is 27 inches wide, 33 to 39 inches in height and 29 to 33 inches in depth. A standard front load dryer is 27 to 29 inches wide, 36 inches in height and 30 to 35 inches in depth. Allow an opendoor clearance of at least another 20 inches. Make sure to include the height of any washer and dryer pedestals.
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WEBUnderstanding how washing machine capacity relates to its size is essential. The capacity, measured in cubic feet, commonly ranges from: Compact: to cubic feet. Medium: to cubic feet. Large: to cubic feet. Extralarge: + cubic feet. Dimensions grow proportionately with capacity.
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WEBJun 17, 2020 · The mining depth becomes increasingly deeper. The mining depth in the early 1980s was around 300 m, which reaches 1000 m presently. With the increasing mining depth, the height of WFFZ will increase, according to the above analysis in the "Mining depth of coal seam" section. 3. The mining thickness becomes increasingly .
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WEBMay 14, 2016 · Sample photograph of a central part of the coal sample (a) and the corresponding depth map (b) (cali ... measure the coal volume using machine vision. ... constructing a coal layer surface height ...
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WEBMar 8, 2024 · Understanding. Gauges for depth, as their name suggests, are precision measuring instruments used to ascertain the depth of a hole, slot, or other recessed feature. Their appliions are diverse and farreaching, spanning across industries from manufacturing to quality control, to mechanical engineering.
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WEBJun 30, 2019 · The underground method is suitable for. extraction of deeper coal seams, whereas opencast method is suitable for shallow coal seams. However, due to less production cost, mechanisation, and less ...
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WEBOct 1, 2021 · A multipoint LIBS experiment setup was used to measure sodium concentration in the gas phase (shown in Fig. 2).The focusing and collection system were fixed on a platform, and the measurement point can be moved at a given height [30].The results show that the sodium release influenced by the particle burning stages, and .
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WEBPDF | On Jan 1, 2021, Sundas Matloob and others published Safety Measurements and Risk Assessment of Coal Mining Industry Using Artificial Intelligence and Machine Learning | Find, read and cite ...
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WEBFeb 21, 2024 · The dimensions of a washing machine typically include its width, height, and depth. By accurately measuring these dimensions, you can avoid potential installation challenges and ensure a seamless fit within your laundry area. Width. The width of a washing machine refers to the horizontal measurement from one side of the appliance .
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WEBNov 1, 2019 · Tensile strength of the coal measures was varied and chosen in between 1/20th to 1/15th of the value as determined in laboratory. The values of the exponent b were taken as for coal measure rocks, and for coal, which are the most probable estimates obtained from the triaxial data compiled by Sheorey. Rock mass rating of the .
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