Results 41 to 50 of about 9,272 (117)

Preparation and Protective Performance of High-Reflection and High-Thermal Insulation Laser Protection Coatings [PDF]

Cailiao Baohu
Laser weapons have entered the actual combat application stage， and the research on anti-laser protection for air and space weapons is becoming increasingly urgent.Prolonged high-energy laser irradiation leads to problems such as reduced metal ...
LI Shuwen, WU Lingfeng, YANG Guanjun, CHEN Lin
doaj   +1 more source

Quantitative Angle Measurement of the Inclined Surface Crack Based on Laser Ultrasonics

Sensors
To measure the angles of oblique surface cracks on a specimen, the method of using the time difference between the reflected and scattered waves generated by the interaction of the surface waves and the crack is proposed.
Haiyang Li, Rui Zhang, Qianghua Pan, Pengfei Wang   +3 more
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Effects of Primary Fracture Length on High-Voltage Electrical Pulse Fracturing Coal Rock Mass

Taiyuan Ligong Daxue xuebao
【Purposes】As a new method of fracturing, high-voltage pulse discharge in water has been widely used in coalbed methane fracturing owing to its green, safe, efficient, and controllable characteristics. Since to the abundant primary cracks in coal and rock
YAO Qiangqiang, ZHAO Jinchang, NIU Shaoqing, LIU Zhenghe, LI Ming   +4 more
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Low-frequensy penetration of elastic waves through a periodic array of cracks

Advanced Engineering Research, 2017
Introduction. The investigation of elastic wave penetration through periodic gratings is an important problem in the fields of the ultrasonic quantitative evaluation of materials, sound propagation and electromagnetic waveguides with diaphragms.
Michael. Yu. Remizov
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RESEARCH ON REFLECTION CRACKING CHARACTERISTICS OF WARM-MIX RECYCLED ASPHALT MORTAR UNDER THE EFFECT OF FREEZE-THAW CYCLES

Materiali in Tehnologije
The reflection cracking behavior of warm-mix recycled asphalt mortar (WRAM) under freeze-thaw cycles was investigated using a combination of the overlay test and digital image correlation (DIC) technology.
Jian Gao, Zhiqiang Liu, Chao Li, Lan Wang, Yudong Ma   +4 more
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The distribution characteristics of blasting fractures and their engineering applications under the coupling effect of in-situ stress and energy-releasing end structure

Meikuang Anquan
As an effective technical means to improve the permeability of coal seam, pre-splitting blasting has important application value in the field of coal mine gas drainage.
Jie LI
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Clustering approach for crack detection in GPR data: Influence of infilling material on detectability

Case Studies in Construction Materials
Ground-Penetrating Radar (GPR) is a non-destructive method widely used for detecting cracks and other subsurface defects in concrete pavements. The effectiveness of GPR in detecting cracks can be significantly influenced by the infilling material present
Mercedes Solla, Norberto Fernández, Ahmed Elseicy, Jorge Pais   +3 more
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Microwave resonance detection method for hidden crack depth in rock and cementitious mortar

Scientific Reports
Before the rock in engineering projects such as mining, tunnel excavation, steep road construction, and oil and gas extraction undergoes failure, macroscopic and microscopic cracks will appear. The management or utilization of these cracks is inseparable
Chuanjing Ou, Yu Chen, Xindong Zhou, Bin Ma, Hongcai Chen, Chuanting Ou   +5 more
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Investigation of Stress Wave Propagation and Crack Propagation Characteristics in Intersecting-Joint Mass Under Blasting

Fractal and Fractional
The propagation of stress waves and the evolution of blasting-induced cracks in discontinuous rock mass are strongly influenced by joint characteristics.
Xian Yang, Xiaojun Zhang, Yongbo Wu, Zhuo Li, Wenxue Gao, Feng Wang, Yang Zhang   +6 more
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Effect of Empty-Hole on Blasting-Induced Damage Evolution and Dynamic Response of Rock

Gaoya wuli xuebao
Aiming at the issue that traditional perimeter blasting easily induces random crack damage in surrounding rocks, this study conducts an in-depth analysis of the damage evolution laws and dynamic response characteristics in empty-hole directional blasting
Tao LI, Yu NI, Zhiliang WANG
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