Abstract Surface defects pose a significant threat to the quality of hot rolled seamless steel pipes. While efficacy contemporary vision-based deep learning methodologies is undeniable, they encounter challenges in accurately identifying substantial depth that compromise quality. Furthermore, these techniques often erroneously report numerous superficial defects. To overcome this obstacle, we have designed novel visual detection system specifically for surface on This inspired by laser...

Due to modern mining methods deployed in recent years, production of coal mines has been expanded significantly compared thirty years ago. As a consequence, the depth is becoming ever deeper. A common world-wide problem that underground are currently experiencing hazard caused by hot environment, which also promotes great need reliable mitigation measures assist mine operators controlling heat stress for miners as well maintaining normal operation mine. In this paper, model air-route...

The development characteristics, scale and control factors of fractures are the core subjects reservoir sweet spot prediction. sandstone TX2 gas in Zhongjiang Gas Field is a typical low porosity permeability tight with strong heterogeneity, but relatively high-quality reservoirs can be found different well areas segments. In this paper, taking second Member Xujiahe Formation (TX2) as an example, were systemically investigated via observation, thin section, logging data, fracture...

Obtaining the digital characterization and representative elementary volume (REV) of broken rock masses is an important foundation for simulating their mechanical properties behavior. In this study, utilizing surrounding main powerhouse at Liyang pumped storage power station as engineering background, a three-dimensional fracture network generation program first developed based on theories discrete (DFN) element method (DEM). The then integrated with distinct modelling platform to generate...

In this article, we comprehensively reviewed Argentina’s Vaca Muerta formation, which encompasses a geological overview, advances in extraction technologies, the potential environmental impact, and economic analysis. Detailed analysis is discussed, emphasizing stratigraphy, lithology, depositional environments of crucial for understanding distribution quality hydrocarbon resources. The latest advancements hydraulic fracturing horizontal drilling are explored, have significantly improved...

The problem of ground control stability due to large underground mining operations is often associated with movements and deformations strata. It a complicated problem, can induce severe safety or environmental hazards either at the surface in Hence, knowing subsurface strata movement characteristics, making any subsidence predictions advance, are desirable for engineers estimate damage likely affect Based on previous research findings, this paper broadly applies prediction model based...

The ground control stability problem due to underground large mine openings often associates with movements and deformations of strata. situation becomes more complicated when relative subsidence research involves zones above the coal pillar. Continues fractures in strata created by such progress may become pathway fresh air delivery or water migration aquifer which would cause problems combustion resource losing. Hence, knowing subsurface movement characteristics over gob pillar make any...

The main structure of a fiber-reinforced composite is determined by preform. manufacturing preforms associated with the generation fiber hairiness or even breakage due to friction, which can compromise properties final component. This study simulated frictional behavior carbon fibers during flexible oriented three-dimensional weaving determine processing parameters that affect yarn damage. normal load and rubbing angle affected hairiness, while tension was factor for However, sliding...

Abstract In underground mining operations, the overlying strata move, deform, and crack as working face advances due to breakage, failure, subsidence, forming a “vertical three zone” over mined out area. The permeability of under changes differently in different zones. Therefore, studying distribution is very important obtain knowledge gas migration pattern order increase extraction efficiency. this study, series numerical models are developed describe movement for detail, calculating...

Three-dimensional composite preform is the main structure of fiber-reinforced composites. During weaving process large-sized three-dimensional preform, relative rotation or translation between fiber feeder and guided array occurs before feeding. Besides, needles can be at different heights after moving out from array. These problems are mostly detected adjusted manually. To make more precise efficient, we propose machine vision-based methods which could realize accurate estimation adjustment...

Transfer learning can greatly speed up reinforcement for a new task by leveraging policies of relevant tasks. Existing works policy reuse either focus on only selecting single best source transfer without considering contexts, or cannot guarantee to learn an optimal target task. To improve efficiency and optimality, we develop novel method, called Context-Aware Policy reuSe (CAPS), that enables multi-policy transfer. Our method learns when which is reuse, as well terminate its reuse. CAPS...

Abstract Orthotropic steel bridge decks (OSBDs) are characterized by overall structural asymmetries and severe local stress concentrations; meanwhile, complicated service loadings always cause relevant rib‐to‐3deck (RD) welded joints in multiaxial states. Under such circumstances, a full‐scale OSBD model was established. Six loading cases were applied, the fatigue deviation calculated to represent state of deck. Based on effective traction method, most unfavorable case for failure mode RD...

As the main structure of fiber-reinforced composite, preform affected mechanical properties composite. The forming preforms is associated with damage fiber due to tow-metal friction, which can compromise composite component. This study simulated frictional behavior carbon fibers during flexible-oriented three-dimensional woven process reveal mechanism and determine window, effects processing-related parameters on friction were discussed. normal load pre-tension played a dominant role in...

With the rapid development of automatic driving, point cloud recognition is becoming an important problem for 3D understanding. Among existing works, they don't take full advantage local structural information and relationship between points difficult to be represented. In this paper, we propose graph attention neural network (GANN) enhance representation clouds by relational degree points. We construct structure on use mechanism compute different nodes in a neighborhood, then embedding them...

To address the problem that bonding can lead to a reduction in surface shape precision of space-bound mirror, relationships between mirror deformation, thermal stress, and curing shrinkage stress were studied, microstress design route was proposed. The deformation introduced by expansion mismatch eliminated through an athermal adhesive layer thickness design. relationship derived completely, structural optimization measures for releasing are given. Bonding analysis conducted based on...

Ballistic impact damage of three-dimensional woven composites have not been sufficiently studied. Numerical and experimental methods were used to evaluate the ballistic penetration behavior three dimensional carbon fiber reinforced in this paper. A one-stage light gas gun apparatus was employed conduct tests. Based on nonhomogeneous elements method, a finite element model considering strain rate effect matrix established analyze mechanisms 3D subjected loading. The speed history acceleration...