in longwall mining quizlet

International Mining The images or other third party material in this article are included in the articles Creative Commons license, unless indicated otherwise in a credit line to the material. Methane released from the coal seam and surrounding rock strata during mining can present a high risk of explosion at concentrations in air of 5-15%. Joy-engineered powered roof support PRS solutions. The lens focal length is 2.02mm, and angle of field of view is 119.8(D), 105.2(H) and 87.2(V). Scientific data. up to 30 tonnes or more), the process of recovering the equipment from a environmental impacts of longwall mining-acid mine drainage-damage to aquifers-damage to human structures. IM can now exclusively reveal that Caterpillar Inc is set to effectively withdraw completely from underground coal and soft rock mining through the divestment of its longwall business to Germany's Hauhinco Maschinenfabrik GmbH & Co KG, based in Sprockhvel, North Rhine-Westphalia. J. scientific data. J. arXiv preprint arXiv:2205.08534. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Email: [emailprotected] or [emailprotected], Posted by Paul Moore on 24th February 2022, AngloGold eyes autonomous haulage advantages at Nevada project, BME enhances blasting control and monitoring with next-generation Xplolog release, Appian Capital to take on Rosh Pinah zinc-lead mine in Namibia, Caterpillar has entered into a preliminary agreement with. There is a history of cooperation between Hauhinco and . operations. subsurface mining Flashcards | Quizlet Once the coal seam is exposed, it is drilled, fractured and systematically mined in strips. Task-oriented feature-fused network with multivariate dataset for joint face analysis. A range of engineering techniques are used to design the layout and dimensions of underground mine workings so that surface subsidence can be anticipated and controlled. Lin, L. et al. Copyright 2023 Komatsu. In hydraulic_support_guard_plate_90_abnormal state, the unfolding angle of the guard plate is 90, and there is a small gap between the guard plate and the coal wall, so the support strength is not enough. Therefore, some image frames have been removed and the other images are sorted according to the different categories, and the obtained images are used as the original image source of the DsLMF+ dataset. isaias_arce. The LabelImg tool was used to annotate the training set and validation set in accordance with YOLO format, in the meanwhile, we also converted the YOLO datasets into COCO datasets through script files and retain. Also, a new chapter Longwall Top Coal Caving Mining (LTCC) is added due to its successful application in Australia since 2005. Safety helmet is a kind of safety equipment that coal miners must wear at all times during their work. The image height and width of the input image are both resized to 640 in the network training. DOI link for Longwall Mining, 3rd Edition. Yang, W., Zhang, X., Ma, B. et al. It is one of the high extraction methods of mining coal underground. gate roads have to be driven to high standards or problems will arise; good Implementation of Video Transcoding Client Based on FFMPEG. Longwall mining is an efficient mining method and using the right equipment can make it even more profitable. J. Figure4 shows the graphs of the three models performance during validation, the mAP value curves of each target detection network model. Coal Mining 2 Flashcards | Quizlet 15 answers. At the same time, in order to ensure the quality and application effect of the dataset, the five members uniformly reviewed the controversial images in the dataset, such as the size threshold of large coal, the angle involved in the guard plate image and its label, the label veracity of the downhole towline, coal personnel behaviour and the mine safety helmet. The involved dataset labels of the hydraulic support guard plate states are shown in Fig. The WCA represents industry leaders, committed to building a sustainable future for global coal. installed is referred to as the "main gate" (or "maingate"), with the roadway at the opposite end If material is not included in the articles Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. Steps are taken minimise impacts on all aspects of the environment. Breadcrumbs Section. 4 most abundant elements in soil: oxygen (46%) silicon (28%) aluminum (8%) . Scientific Data. The greater the power, the larger the physical size of the drive units Caterpillar Incs executive office made this statement to IM: Caterpillar has entered into a preliminary agreement withHauhinco to divest the longwall product line. Study with Quizlet and memorize flashcards containing terms like beds or layers, caved roof materials, at the face and more. Google Scholar. Improved Mask R-CNN for Aircraft Detection in Remote Sensing Images. The numbers before and after the underline in hydraulic_support_guard_plate_00_30, hydraulic_support_guard_ plate_30_60 and hydraulic_support_guard_plate_60_90 respectively represent the angle range corresponding to the unfolding state of the guard plate. The single-label datasets of the large coal, mine safety helmet, towline and mine personnel are named as large_coal, mine_safety_helmet, towline and coal miner, respectively. Sci Data 10, 416 (2023). The DsLMF+ datasets were trained on a machine with Intel(R) Xeon(R) Gold 6330 CPU, RTX A5000 GPU and Ubantu18.04. 6, 110 (2022). Hauhinco, a company with over 111 years of history, has a focus in mining in designing customer-specific high pressure emulsion pump stations for roof supports in longwalls as well as water spray pump stations supplying the shearer water spray or the coal plow water spray and the cooling systems for the drive motors with the necessary pressure and volumetric flow rate. Internet Explorer). In accordance with the coal mining process of the fully mechanized coal face, once the hydraulic support plate is not in place or not fully recovered during the working process, it may cause the movement interference between hydraulic support and shearer. J. J. IEEE Transactions on Instrumentation and Measurement, 71 (2022). only needed in the first workings portion and during installation and recovery The benefits of longwall mining compared to other methods These pillars can be up to 40% of the total coal in the seam although this coal can sometimes be recovered at a later stage. (a) coal miners; (b) large coal;(c) towline; (d) mine safety helmet; (e) miners behaviours; (f) hydraulic support guard plate. This work includes the datasets of the mine personnel, towline, mine safety helmet and large coal with the single-label annotation, as well as the hydraulic support guard plate and miners behaviors with multi-label annotations. 21, 2618 (2021). The tri-classification automatic filter model has been provided along with the datasets, and its specific usage can be on reference on in its attached README file. climate. Longwall - definition of longwall by The Free Dictionary adversely impacted. Longwall face stability analysis from a discontinuum-Discrete Fracture Dust levels at mining operations can be controlled by spraying water on roads, stockpiles and conveyors. Azam, B. et al. PubMed Xia, G.S. 6, 162 (2019). Longwall Mining Process. Trees planted in these buffer zones can also minimise the visual impact of mining operations on local communities. (numbers of a magnitude of several hundred items, with many components weighing 13 (2021). ATOC quiz 3. to the number of continuous miner units which would be required to produce the Article The abnormal condition of the working face was judged by specialized personnel through real-time video surveillance in traditional production process, this may result in the abnormal condition not be found in time because the visual fatigue during the long-term work. Varadarajan, V., Garg, D. & Kotecha, K. An Efficient Deep Convolutional Neural Network Approach for Object Detection and Recognition Using a Multi-Scale Anchor Box in Real-Time. REVIEWER Flashcards | Quizlet The above mAP values indicate that the models have good performance, and the DsLMF+ dataset performs well under YOLOv7, DETA and ViT-Adapter-L. J. the power, the larger (and therefore heavier) the chain on the face conveyor On the basis of the analysis on the format and production method of the above commonly used object detection datasets, the production of the datasets in this work has been completed by personnels who are familiar with the fully mechanized mining face in coal mine. & Lu, Z. Weakly supervised classification model for zero-shot semantic segmentation. The roadways which form the sides of the arXiv preprint arXiv:2212.06137. Find step-by-step Environmental science solutions and your answer to the following textbook question: Which of the following methods is not a subsurface mining method? J. In this paper, the face instability in the longwall mining methods is referred to as the failure, displacement and complete detachment of coal face (known as coal face spall) and top coal/immediate roof between shield support and face line (known as top coal fall/roof fall). Water pollution is controlled by carefully separating the water runoff from undisturbed areas from water which contains sediments or salt from mine workings. blocks. J. Concurrency and Computation: Practice and Experience. Caterpillar has been making some major strategic moves of late to focus on its core surface mining and underground hard rock mining equipment products, technologies and systems. The coal is loaded on to large trucks or conveyors for transport to either the coal preparation plant or direct to where it will be used. Overview of the construction process for the DsLMF+ datasets. When coal has been extracted from the area, the roof is allowed to . 8, 66 (2021). Antonios Papaspiropoulos, Aircraft detection in satellite imagery using deep learning-based object detectors. The ability of the mine to develop new longwall blocks so that longwall production continuity is not Terms in this set (17) Applicatiion - tabular shaped deposits - large lateral extent Longwall mining systems This process is repeated continuously, web by web, thus The abnormal images that need to be processed mainly include the following situations: 1) When the fully mechanized mining face is affected by severe environmental factors such as high dust and water mist, it is difficult to identify the coal miners, large coal and hydraulic support guard plate, towline, mine safety helmet and miners behaviors in the collected images. . Created by. The answer (c) is incorrect because longwall mining is an underground coal mining method that uses metal ceiling supports to enable the single-slice extraction of a long wall panel of coal. Tables17 respectively describes the datasets of mine safety helmet, towline, coal miners, miners behavior, large coal and guard plate in multiple different scenarios. Scaling up face masks detection with YOLO on a novel dataset. The Labelimg software has been used to complete the label annotation of datasets in the YOLO format30, which make it convenient to be used in the currently popular YOLO series target detection networks. Flashcards. When operating correctly the coal is mined in a systematic, relatively continuous and repetitive process which is ideal for strata control and for associated mining operations longwall miningc. The coal industry takes the issue of safety very seriously; modern coal mines have rigorous safety procedures, health and safety standards and worker education and training. The longwall panel (the block of coal that is being mined) is typically 3 - 4 km long and 250 - 400 m wide. Hence, the safety helmets are related to the safety of coal miners in fully mechanized mining face, and the wearing of the safety helmet for the coal mine staff also needs real-time monitoring. 4.9, 5.7, and 6.7 ft. (1.5, 1.7, 2.0 m or more), Go to the Komatsu corporate website or a Komatsu website in your local region. J. Panel lengths range between 3,000-15,000 ft. 42 terms. production and hence income is zero during this period. Self-advancing, hydraulically-powered supports temporarily hold up the roof while coal is extracted. Find step-by-step Environmental science solutions and your answer to the following textbook question: Salt is mined underground using what technique? 120 (2022). 4) The target objects in the downhole video acquisition are in a moving state. Currently, datasets are widely used in automatic driving, object detection, face recognition, natural language processing, text detection, medical and other fields7,8,9,10. 5, the detection effect and accuracy demonstrated the reliability and practicability of DsLMF+ datasets. Because of the unforgiving nature of longwalls, experienced labour is essential for successful Flashcards. Longwall mining involves the full extraction of coal from a section of the seam, or face using mechanical shearers. Digital Campaign Co-Ordinator (Northern Hemisphere): The researchers can set the label in YOLO, VOC or CreateML format and annotate the images according to the instructions provided by the official. https://doi.org/10.1201/9780429260049, Registered in England & Wales No. 1, which is mainly divided into the following three steps: (1) Image data collection; (2) Image data filtering; (3) Data labeling. factor. completely removing a rectangular block of coal, the length of the block +44 7739 438 480, 2020 World Coal Association | Unless otherwise stated, all images are courtesy of iStock. Other steps can also be taken, including fitting drills with dust collection systems and purchasing additional land surrounding the mine to act as a buffer zone. J. Wireless Communications and Mobile Computing. In each panel two or more parallel drifts (for ventilation and ore transport) are driven along the opposite long sides to provide access, and at the end of the Read More In coal mining: Origins of longwall mining DsLMF+ dataset have provided two types of datasets formats of YOLO and COCO, which make it convenient to be applied for the currently popular top-ranked target detection neural networks. & Zhang, M. A Surveillance Video Real-Time Analysis System Based on Edge-Cloud and FL-YOLO Cooperation in Coal Mine. An open dataset for intelligent recognition and classification of abnormal condition in longwall mining. Xuhui Zhang professor mainly be responsible for the overall planning for organize dataset, Wenjuan Yang associate professor responsible for writing the thesis, Yongwei Liu in charge of collect dataset pictures, Mengyao Huang responsible for abnormal data filtering, Jianxing Yan, Bing Ma, Chao Zhang and Jicheng Wan are responsible for the dataset label annotation, Xuhui Zhang, Wenjuan Yang Yuyang Li, Yue Wang and Dian Zhao are responsible for the dataset label review, and put forward valuable opinion, Yujia Wu and Yanqun Wang are responsible for the training dataset, Manuscripts of the dataset were reviewed and reviewed by all authors. PubMedGoogle Scholar. Joy longwall systems There are two main methods of underground mining: room-and-pillar and longwall mining. Considering that the downhole datasets are still blank at present, this work constructs image dataset DsLMF+ for intelligent recognition of abnormal condition in underground longwall mining face, which mainly consists of the hydraulic support guard plate, large coal, towline, mine safety helmet, coal miners and miners behaviour in the fully mechanized face. Study with Quizlet and memorize flashcards containing terms like What equipment is involved in a non mechanized longwall operation?, How long can longwall panels be?, How wide can the longwall face be? Francies, M. L., Ata, M. M. & Mohamed, M.A. What is longwall mining? Other Quizlet sets. FINet: An Insulator Dataset and Detection Benchmark Based on Synthetic Fog and Improved YOLOv5. Longwalls are not very flexible and are "unforgiving" - they do not handle seam discontinuities well; Zhang, X. et al. Coal mining takes place either underground or through surface/ opencast operations. Improved Traffic Sign Detection Algorithm Based on Faster R-CNN. Longwall Mining. Xu, Z., Li, J. arXiv preprint arXiv:2207.02696. produced are relatively low. In hydraulic_support_guard_plate_90_120 state, the unfolding angle of the guard plate is too large, which resulting in the gap between the guard plate and the coal wall is too large, and the support strength is not enough. Other Quizlet sets. The longwall panel (the block of coal that is being mined) is typically 3-4 km (1.9-2.5 mi) long (but can be upto 7.5 km (4.7 mi) long) and 250-400 m (820-1,310 ft) wide. Ouyang-Zhang, J., Cho, J., Zhou, X. Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 0.6-6.0 m (2 ft 0 in - 19 ft 8 in) thick). In room-and-pillar mining, coal deposits are mined by cutting a network of rooms into the coal seam and leaving behind pillars of coal to support the roof of the mine. You are using a browser version with limited support for CSS. Google Scholar. Gao, Y., Dai, Z. depending on a number of factors (see later notes). Related questions. 105 terms. Remote Sensing. Longwall mining - Wikipedia two roadways that form the sides of the longwall block, with one rib of this Journal of Big Data. The coal falling form roof and the collision between personnel and equipment may cause injury accidents. J. There are 30704 mine personnel images with 24563 images in training sets and 6141 in validation set, 21017 large coal images with 16813 images in training sets and 4204 in validation set, 21412 towline images with 17129 in training sets and 4283 in validation set, 20117 mine safety helmet images with 16093 in training set and 4024 in validation set, 24709 miners behavior images with 19767 in training sets and 4942 in validation set, and 20045 hydraulic support guard plates images with 16036 in training sets and 4009 in validation set. Yang, L., Birhane, G. E., Zhu, J., Geng, J. Applied Sciences. Additional operational issues such as extension of panel width and compatibility test are also discussed. At the same time, in order to extend the application range of this dataset, the label format of the dataset has also been converted into the COCO format through label format conversion script, and therefore it could be used in the currently popular COCO target detection methods. to divest the longwall product line. Chen, Z. et al. Permanent supports are This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. a longwall block can be problematic, and is best done during a relocation. Underground Mining methods Flashcards | Quizlet 3. Once the longwall face equipment has A multiobjective hybrid optimization algorithm for path planning of coal mine patrol robot. Study with Quizlet and memorize flashcards containing terms like Applicatiion, Longwall Retreat System, Advancing Longwall and more. Caterpillar andHauhinco will work together to ensure a smooth transition to minimise any impacts to customers and dealers. On the reasoning behind the move, the company stated: To stay focused on Caterpillar core products and services, the company has made the decision to exit the longwall product line..

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