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4581
Experimental Investigation of Dynamic Compression Mechanical Properties of Frozen Fine Sandstone
Published 2020-01-01“…Aiming at the dynamic mechanical properties of weakly cemented fine sandstone in the rich water-bearing strata in western China under dynamic loading, a 50 mm rod diameter separation Hopkinson pressure bar (SHPB) test was used to study the Paleogene fine sandstone in a coal mine in Ningxia. The system carried out the impact compression tests of −15°C, −20°C, and −30°C and the average strain rate of 28 s−1–83 s−1 and obtained the dynamic compressive strength of the frozen fine sandstone specimens under different test conditions. …”
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4582
Goaf Gas Control Improvement by Optimizing the Adjacent Roadway Large-Diameter Boreholes
Published 2021-01-01“…Using the 2-105 working face of the Tenghui Coal Mine, Shanxi Province, China, as a case study, the distribution patterns of gas concentration and flow field in the goaf for various extraction flow parameters and different positions of boreholes were numerically simulated. …”
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4583
The Aphid Fauna (Hemiptera:Aphidoidea) and Host Plants of The Büyükada Island (İstanbul, Turkey)
Published 2021-03-01“…In this study, aphid fauna and host plants of aphids were deter-mined in Büyükada islands of İstanbul was determined in this study. …”
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4584
CDR-Detector: a chronic disease risk prediction model combining pre-training with deep reinforcement learning
Published 2024-12-01“…In order to improve the few-shot learning ability of model, a self-adaptive EHR based pre-training model with two new pre-training tasks is developed to mine valuable dependencies from single-visit EHR data. …”
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4585
Study on Failure Characteristics and Rock Burst Mechanism of Roadway Roof under Cyclic Dynamic Load
Published 2021-01-01“…In order to reveal the essence of rock burst of a hard roof in the process of roadway excavation, the particle discrete element method is used to establish a roadway model and simulate the disturbance of harmonic dynamic load based on the analysis of a rock burst accident in a deep mine. The crack field, stress field, displacement field, and kinetic energy of roadway surrounding rock disturbed by cyclic dynamic load were analyzed, and the disaster mechanism of roadway impacting roof instability was discussed. …”
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4586
Evaluation Model of Highway Reconstruction and Expansion Scheme Based on Multiple Attribute Decision Making
Published 2022-01-01“…The results showed that the subjective intention of decision makers was considered and also fully the objective information of data itself was fully mined. The optimal scheme was scheme 3 through the analysis of five HRE schemes. …”
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4587
Optimization of Mucilage Removal from Cress Seeds (L. sativum)
Published 2023-09-01“…In this study, optimum removal conditions of the cress seed mucilage by a chemical method were deter-mined. Moreover, proximate analysis (moisture, fat, protein, ash and total carbohydrate) of the cress seed was carried out. …”
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4588
Field Monitoring and Numerical Simulation Analysis of Deep Shaft Concrete Wall Support
Published 2022-01-01“…Affected by faults, fractures, and high ground stress, the deep shaft wall is prone to deformation and fracture, which affects the safety of mine construction. To investigate the stress and deformation of the shaft wall at the horsehead gate connection, the force-measuring bolt and vibrating string concrete strain gauges were installed for on-site monitoring prior to the shaft wall pouring. …”
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4589
Pressure-Shear Crack Initiation and Expansion Mechanism of Complex Cracked Rock Mass under the Seepage Stress
Published 2023-01-01“…The dense marble of Daye Iron mine with bulk density of 26.6 kN/m3 and uniaxial compressive strength of 52.4 MPa was selected as the material, and the upper and lower fracture surfaces were polished smoothly. …”
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4590
Analysis of Carbon Contents and Heavy Metals in Coal Samples Using Calibration-free LIBS Technique
Published 2022-01-01“…We report a compositional analysis of four coal samples collected from different mines in Pakistan and one Chinese brand. The coal samples were pelletized in the form of a disc and irradiated with a focused laser beam of fundamental (1064 nm) and second (532 nm) harmonics of Nd:YAG laser, which produced plasma on the sample surface. …”
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4591
Energy Dissipation and Fractal Properties of Coal under Cyclic Impact Loading
Published 2024-01-01“…The study of the failure and fractal characteristics of coal samples under different impact pressures and different numbers of impacts provides important information for the prevention and control of coal mine rock bursts.…”
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4592
L’Empire du Mali d’hier à aujourd’hui
Published 2015-07-01“…De cet empire, on sait pourtant peu de choses, si ce n’est qu’il a été fondé par Soundiata Keita, qu’il exporte des esclaves vers le nord et qu’on y trouve des mines d’or d’une très grande richesse. Lors de son accession à l’indépendance, le Soudan français colonial en reprendra le nom en prétendant le faire renaître de ses cendres. …”
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4593
Ecological monitoring of landscape technogenic neoplasms
Published 2024-12-01“…Mine rock dumps belong to the category of landscape technogenic neoplasms and represent a complex of anthropogenically transformed natural components. …”
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4594
Experimental Study on Spontaneous Imbibition Characteristics of Fracturing Fluid at Cores from Different Layers in Fuling Shale Gas Reservoir
Published 2021-01-01“…With low porosity and low permeability, shale reservoirs cannot be mined economically without large-scale hydraulic fracturing operation. …”
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4595
Characteristics Analysis of Generalized Rock Quality Designation (RQD) Based on Degree of Joint Development
Published 2021-01-01“…Three-dimensional fracture network modelling is employed to simulate the actual rock mass of open-pit iron mine in China. Virtual scanlines are set to obtain RQD values in different directions. …”
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4596
Geotourism study of Ghezelowzan basin based on Fassoulas method
Published 2020-12-01“…The selected geosites were then positioned on topographic maps of 1/50000 and using geological maps of 1/100000 of the region, the lithology of different landforms such as hoodoos, Behestan dom, salt domes Chehrabad, Pari lakes, copper mine Baiche Bagh, dikes Sedimentary, cuesta-like forms, kalut-like shapes, Kcadovan-like shaped forms, glacier circuses, and tectonic valleys-fridges. …”
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4597
Utilization of Foaming Technology in Cemented Paste Backfill of High-Mud Superfine Unclassified Tailings
Published 2017-01-01Get full text
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4598
Influence of Fiber Type on Low-Temperature Fracture Performance of Presawed Asphalt Mixture Beams
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4599
Reduction of Vehicle-Induced Vibration of Railway Bridges due to Distribution of Axle Loads through Track
Published 2018-01-01Get full text
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4600