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Articles de revues sur le sujet « Arch. evolution »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

Du, Xiao Li, Hong Wei Song, and Jie Chen. "Laws of Formation and Evolution of Pressure Arch in Coal Mining Adjoining Rock." Advanced Materials Research 243-249 (May 2011): 2596–600. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.2596.

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Based on numerical simulation of computing Software ANSYS, the curve of arching coefficient variation of pressure arch due to actual mining was analyzed aiming to a special mining face, the law of stress transfer and change in surrounding rock was discussed, and the evolving features and characteristics of pressure arch was obtained. The analysis and discussion show the following facts: Arch body will become thicker and stress in the arch body increases with working face’s driving distance increasing; the morphology of pressure arch transits from ellipsoid with long axis in the vertical direct

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Wang, S. R., X. G. Wu, Y. H. Zhao, P. Hagan, and C. Cao. "Evolution Characteristics of Composite Pressure-Arch in Thin Bedrock of Overlying Strata During Shallow Coal Mining." International Journal of Applied Mechanics 11, no. 03 (2019): 1950030. http://dx.doi.org/10.1142/s1758825119500303.

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Under the shallow coal mining condition and based on the cracking and movement rules of the roof in different mining stages, the mechanical models of symmetrical pressure-arch, stepped pressure-arch, rotating-squeezed pressure-arch in the mining field were established. Then, the instability criterion of each pressure-arch structure was derived. Through the similarity material experiment and numerical simulation, the evolution characteristics of the composite pressure-arches in the near- and far-field were revealed. Results show that the stepped pressure-arch in broken blocks of the basic roof

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3

Rusu, Ligia, Mihnea Ion Marin, Michi Mihail Geambesa, and Mihai Robert Rusu. "Monitoring the Role of Physical Activity in Children with Flat Feet by Assessing Subtalar Flexibility and Plantar Arch Index." Children 9, no. 3 (2022): 427. http://dx.doi.org/10.3390/children9030427.

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Flat foot is a common pediatric foot deformity which involves subtalar flexibility; it can affect the plantar arch. This study analyzes the evolution of two parameters, i.e., plantar index arch and subtalar flexibility, before and after physiotherapy and orthoses interventions, and examines the correlation between these two parameters. Methods: The study included 30 participants (17 boys, 12 girls, average age 9.37 ± 1.42 years) with bilateral flat foot. We made two groups, each with 15 subjects. Assessments of the subtalar flexibility and plantar arch index used RSScan the platform, and were

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Tian, Zhongchu, Yue Cai, Hongtao Shi, et al. "Simulation of Test Arch Based on Concrete Damage Plasticity Model and Damage Evolution Analysis." Applied Sciences 13, no. 20 (2023): 11239. http://dx.doi.org/10.3390/app132011239.

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In light of the limited research on latent damages during the construction of large-span suspension arches, this study introduced a method to simulate structural damage utilizing random porosity. Initially, based on data from real-world engineering projects, the most susceptible areas within the arch structure were pinpointed. Subsequently, multiple test arch simulation models were constructed. Employing Python, commands for random porosity were implemented within ABAQUS and distinct mesh modules were devised to depict structures under varying degrees of damage. The current investigation delve

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Barske, Lindsey, Peter Fabian, Christine Hirschberger, et al. "Evolution of vertebrate gill covers via shifts in an ancient Pou3f3 enhancer." Proceedings of the National Academy of Sciences 117, no. 40 (2020): 24876–84. http://dx.doi.org/10.1073/pnas.2011531117.

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Whereas the gill chambers of jawless vertebrates open directly into the environment, jawed vertebrates evolved skeletal appendages that drive oxygenated water unidirectionally over the gills. A major anatomical difference between the two jawed vertebrate lineages is the presence of a single large gill cover in bony fishes versus separate covers for each gill chamber in cartilaginous fishes. Here, we find that these divergent patterns correlate with the pharyngeal arch expression of Pou3f3 orthologs. We identify a deeply conserved Pou3f3 arch enhancer present in humans through sharks but undete

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González Manrique, S. J., C. Kuckein, M. Collados, et al. "Temporal evolution of arch filaments as seen in He I 10 830 Å." Astronomy & Astrophysics 617 (September 2018): A55. http://dx.doi.org/10.1051/0004-6361/201832684.

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Aims. We study the evolution of an arch filament system (AFS) and of its individual arch filaments to learn about the processes occurring in them. Methods. We observed the AFS at the GREGOR solar telescope on Tenerife at high cadence with the very fast spectroscopic mode of the GREGOR Infrared Spectrograph (GRIS) in the He I 10 830 Å spectral range. The He I triplet profiles were fitted with analytic functions to infer line-of-sight (LOS) velocities to follow plasma motions within the AFS. Results. We tracked the temporal evolution of an individual arch filament over its entire lifetime, as se

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7

Wang, Shuren, Xiaogang Wu, Yanhai Zhao, and Paul Hagan. "Mechanical Performances of Pressure Arch in Thick Bedrock during Shallow Coal Mining." Geofluids 2018 (October 1, 2018): 1–13. http://dx.doi.org/10.1155/2018/2419659.

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Due to the periodicity of mine pressure, it can easily lead to a wide-range damage of the overburden rock under shallow coal mining conditions, and the falling of the overburden rock is usually a serious threat to the mining safety. Based on the monitoring data of mine pressure in a typical shallow coal mine in northern China, the mechanical model of the surrounding rock in the mining field was built and the identification indicators of the pressure arch after coal mining was defined. Then, the arching mechanism, the stress distribution characteristics in different positions, and the bearing c

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8

Melovitz-Vasan, Cheryl, Susan Huff, and Nagaswami Vasan. "Complex and multiple anomalies of the aortic arch: Atypical origin of the vertebral artery of continuing interest among embryologists, anatomists, and clinicians." Italian Journal of Anatomy and Embryology 128, no. 2 (2024): 23–29. https://doi.org/10.36253/ijae-15440.

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Aortic arch branching anomalies are a relatively rare occurrence, observed in approximately 3-5% of cadavers. These anomalous branching patterns continue to be a topic of ongoing dialogue in embryological evolution and cervical region surgery. During dissection, it was discovered that the donor’s left vertebral artery arose from the aortic arch between the left common carotid and subclavian arteries. In an earlier report that is included here, the right vertebral artery arose directly from the aortic arch (authors and journal expressed permission and attribution: Vasan et al., 2022). This pape

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9

Wang, Feng, Tong Chen, Bo Ma, and Denghong Chen. "Formation mechanism of stress arch during longwall mining based on key strata theory." Energy Exploration & Exploitation 40, no. 2 (2021): 816–33. http://dx.doi.org/10.1177/01445987211042701.

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The traditional stress arch hypothesis during longwall mining fails to elucidate the formation mechanism of stress arch, and the morphological characteristics and evolution of stress arch are indefinite. To solve these problems, a mechanical model was established for elucidating the formation mechanism of stress arch in overlaying strata. The influencing of key strata on the morphological characteristics of the stress arch was studied. Finally, the evolution of the stress arch during longwall mining was studied through numerical simulation. The results show that the bearing structure of the ov

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10

Tian, Zhongchu, Ye Dai, Tao Peng, Zujun Zhang, Yue Cai, and Binlin Xu. "Laminated Steel Fiber-Reinforced Concrete Hingeless Arch: Research on Damage Evolution Laws." Applied Sciences 14, no. 12 (2024): 5015. http://dx.doi.org/10.3390/app14125015.

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In the context of reinforced concrete (RC) arch bridges, while the incorporation of full sections of steel fibers can enhance the bridge’s toughness, cracking resilience, and bearing capacity, achieving an optimal balance between structural performance and economic viability in this manner remains challenging. This article introduces a novel computational approach—the distributed steel fiber concrete (LSFRC) arch—which considers the spatial distribution of damage in RC arches. The static performance of SFRC elements and LSFRC beams was compared and analyzed using the concrete plastic damage mo

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11

Cheng, Lin, Jiamin Chen, Chunhui Ma, Jie Yang, Xiaoyan Xu, and Shuai Yuan. "Multipoint Deformation Safety Monitoring Model for Concrete Arch Dams Based on Bayesian Model Selection and Averaging." Structural Control and Health Monitoring 2023 (March 28, 2023): 1–19. http://dx.doi.org/10.1155/2023/5042882.

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The deformation properties of concrete arch dams are affected by the synergistic effects of multiple factors, featuring strong, multidimensional spatialtemporal evolution and distribution characteristics. This paper proposes a zoned safety monitoring model for arch dam deformation based on spatialtemporal similarity and model optimization to evaluate the deformation safety state of arch dam structures. First, zoned clustering of the deformation monitoring points at different locations of an arch dam was performed using a panel data multi-index clustering method to determine the deformation law

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12

Ding, Yanchao, Zhongfu Xiang, Yayong Li, Xuesong Zhang, and Yin Zhou. "Mechanical System Evolution and Reasonable Structural Design Parameters of Long-Span Deck-Type Beam-Arch Composite Rigid Frame Bridge." International Journal of Design & Nature and Ecodynamics 15, no. 6 (2020): 885–93. http://dx.doi.org/10.18280/ijdne.150614.

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Long-span deck-type beam-arch composite rigid frame (BACRF) bridge fully integrates the merits of arch bridges and beam bridges, and overcomes the cracking and deflection problems of continuous rigid frame bridges. As a perfect combination of beam bridges and arch bridges, the long-span deck-type BACRF bridge boasts a light structure, a strong bearing capacity, and a powerful spanning capability. From the perspective of mechanical system evolution, this paper theoretically analyzes the structural mechanics of the beam-arch composite system, establishes a half-bridge model for BACRF bridge, and

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Margarint, Irina-Maria, Tammam Youssef, Mircea Robu, et al. "The Management of Aortic Coarctation Associated with Hypoplastic Arches and Particular Arch Anatomies: A Literature Review." Journal of Personalized Medicine 14, no. 7 (2024): 732. http://dx.doi.org/10.3390/jpm14070732.

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The surgical management of aortic coarctation in newborns needs to ensure postoperative evolution and long-term results as much as possible. Patients with a Gothic arch have a higher rate of postoperative hypertension, while newborns with a bovine arch have higher rates of restenosis and, thus, an additional risk of mortality. Late hypertension, even in anatomically successfully repaired patients, confers a high risk for cardiovascular events. This review of the literature focuses on the management of aortic coarctations associated with hypoplastic arch and particular arch anatomies, focusing

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14

Raz, Sagi, Marcel Goodman, Daniel Silverberg, and David Planer. "TCT-440 Further Evolution In Aortic Arch Endografting." Journal of the American College of Cardiology 64, no. 11 (2014): B129. http://dx.doi.org/10.1016/j.jacc.2014.07.491.

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15

Mendes, Adriano Teixeira, André Schima Mathias, Edineide Lino Ferreira, Guilherme Ramos Vieira de Melo, and Italo Costa Silva. "The Evolution of Soybean and Corn Waterway Transport in the Northern Arc and Its Importance for the Development of Pará." EnGeTec em revista 1, no. 6 (2024): 132–40. https://doi.org/10.5281/zenodo.12788863.

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This work has the general objective of demonstrating water transport in the north arch and its importance, emphasizing the evolution of corn and soybean transport in the north arch and its contribution to logistics, leading to cost reduction. Observing the current problems of logistics, such as the high cost of transport that is usually carried out by road, leading to increased costs. Brazil makes little use of its waterways, wasting the low cost of transport on its navigable rivers for the flow of commodities such as soy and corn, which could increase the possibilities of distributing these p

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16

Huang, Shunjie, Xiangqian Wang, Yingming Li, et al. "Analysis on Evolution Law of Small Structure Stress Arch and Composite Bearing Arch in Island Gob-Side Entry Driving." Geofluids 2022 (June 23, 2022): 1–12. http://dx.doi.org/10.1155/2022/4303681.

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At present, the theory of supporting the surrounding rock small structure of gob-side entry driving has been widely used, but there is no specific quantitative analytical formula for the bearing strength and bearing characteristics of the structure. Construct a small structural stress arch mechanical model based on the arch axis equation, and divide the width of coal pillars (fractured zone-plastic softening zone-plastic hardening zone) and small structural stress arch height. According to the relationship between the stress arch height and the size of the roadway, the anchor cable length is d

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17

Yingming, Yang, Li Quansheng, Liu Shiliang, et al. "Evolution Mechanism of Thickly Sticky Loose Layered Arch Structure and Prediction Method of Initial Ground Fissure Caused by Underground Coal Mining." Geofluids 2022 (October 10, 2022): 1–16. http://dx.doi.org/10.1155/2022/4933310.

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In view of the problem of taking the loose layer as the uniform cloth load while ignoring thickly sticky loose layered arch (TSLLA) of the traditional mining rock overburden structure analysis, combined with the geological conditions of shallow buried thickly sticky loose layer in Shendong mining area, the mechanical model of the mining TSLLA bearing structure is established, the variation law of arch height under different loose layers is analyzed, and the formation conditions of TSLLA are given. The first theory deduced the dynamic evolution mechanism of TSLLA structure advancing. The dynami

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18

Tang, Jian Quan, Yu Ting Hou, Chao Zhang, and Jian Hao. "Numerical Simulation of Breaking Arch Evolution Rule of Coal Seams Mining." Advanced Materials Research 734-737 (August 2013): 777–80. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.777.

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Numerical simulation analysis were done on breaking arch developing and evolving process of both single stope and coal seams mining field by FLAC3D. Results show that in single strope's advancing process, breaking arch's height would be different as strope's length changes, and breaking arch's height was decided by strope's length; in composite strope, as the coal pillar increasing, composite strope's breaking arch gradually develops from superposition state to independent state; as the strope's length changing composite strope's superposition state tend to balance

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19

Zhang, Changan, Jianlei Gao, Zhengzhong Wang, and Chang Liu. "Model Test on the Collapse Evolution Law of Tunnel Excavation in Composite Strata with a Cavity." Buildings 14, no. 4 (2024): 932. http://dx.doi.org/10.3390/buildings14040932.

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More complex geological conditions could be encountered with the construction of urban subway projects. At present, many subway tunnels have been built in composite strata with upper soft and lower hard layers, but the presence of a cavity in the strata increases the risk of collapse during construction. In this paper, a series of model experiments and discrete element methods were conducted to investigate the failure behavior of composite strata with a cavity caused by tunnel excavation disturbance. The influence of the distance between the cavity and vault (hd) and the distance between the s

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20

Li, C. L., S. R. Wang, Z. S. Zou, X. L. Liu, and D. Q. Li. "Evolution Characteristic Analysis of Pressure - arch of a Double - arch Tunnel in Water - rich Strata." Journal of Engineering Science and Technology Review 9, no. 1 (2016): 44–51. http://dx.doi.org/10.25103/jestr.091.07.

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21

Le Pabic, Pierre, Jean-Luc Scemama, and Edmund J. Stellwag. "Role ofHoxPG2 genes in Nile tilapia pharyngeal arch specification: implications for gnathostome pharyngeal arch evolution." Evolution & Development 12, no. 1 (2010): 45–60. http://dx.doi.org/10.1111/j.1525-142x.2009.00390.x.

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22

Fan, Yonghui, Chao Luo, Yin Zhou, Ligui Yang, Xinglin Li, and Jinlong Liao. "Evolution Law of Concrete Interface Stress of Rigid-Frame Arch under Construction and Its Impact on Ultimate Load-Bearing Capacity." Sensors 23, no. 15 (2023): 6868. http://dx.doi.org/10.3390/s23156868.

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To study the evolution of stress on the ring and segment interfaces during the construction process of the concrete encapsulation of the main arch ring in a rigid-frame arch bridge, alongside its impact on the ultimate load-bearing capacity of the main arch ring, a 1:10 scale model experiment was conducted by taking the 600 m Tian’e Longtan Bridge as the prototype. The key cross-section concrete strain data were collected during the entire construction process of the main arch ring via fiber-optic strain sensors, which were used to investigate the stress evolution at ring and segment interface

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Lin, Qindong, Chun Feng, Yulei Zhang, Yundan Gan, and Jianfei Yuan. "The failure evolution characteristic of the arched structure under blast loading." Journal of Physics: Conference Series 2535, no. 1 (2023): 012020. http://dx.doi.org/10.1088/1742-6596/2535/1/012020.

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Abstract Aiming at the arched structure in the field of defense engineering, it is of significant military value and theoretical innovation to investigate the failure mode and evolution characteristic of the arched structure under blast loading. First, a full-time simulation of the underground arched structure under blast loading is carried ou. Then, the displacement evolution characteristic of the arched structure is studied. Finally, the crack evolution characteristic of the arched structure is studied. The numerical simulation indicates that the dispalcement of concrete near the midpoint of

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24

Muster, Alexander J., Rachid F. Idriss, and Carl L. Backer. "The left-sided aortic arch in humans, viewed as the end-result of natural selection during vertebrate evolution." Cardiology in the Young 11, no. 1 (2001): 111–22. http://dx.doi.org/10.1017/s104795110001252x.

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AbstractAt some point during vertebrate evolution from species dwelling in water to living on land, the ancestral double or right aortic arches became single and left-sided in mammals, including humans, as the result of synchronous developments in cardiovascular and respiratory embryogenesis. Since left-sided aortic arches are unique to mammals, hemodynamics related to the placenta, specifically the requirement for a large arterial duct connecting to the descending aorta, may have led to switching from the right-sided to the left-sided arch. Additionally, development of a trilobar right lung a

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25

He, Yifeng, Jie Zhang, Tao Yang, Jianjun Wu, Shoushi Gao, and Jianping Sun. "Study on the Bearing Structure of Key Strata and the Linkage Evolution Mechanism of Surface Subsidence in Shallow Coal Seam Mining." Applied Sciences 14, no. 20 (2024): 9608. http://dx.doi.org/10.3390/app14209608.

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Shallow coal seam mining results in the formation of various bearing structures in key strata, leading to varying degrees of surface subsidence and severe disruption to the surface ecological environment. To investigate the coupled evolution characteristics of key strata fracture-bearing structures and surface subsidence in shallow coal seam mining, with a focus on the 1–2 coal seam mining at Longhua Coal Mine in northern Shaanxi as the research background, this study employed physical similarity simulation to establish the correlation between key strata fracture-bearing structures and surface

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Braginsky, V. I. "Evolution of the Verse Structure of the Malay Syair." Archipel 42, no. 1 (1991): 133–54. http://dx.doi.org/10.3406/arch.1991.2754.

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27

Aguilar-Jiménez, Jesús, Juan Manuel García-Guerrero, and Juan José Jorquera-Lucerga. "The Diagonal Arch Bridge, a Particular Case of Spatial Arch Bridges." Applied Sciences 11, no. 4 (2021): 1869. http://dx.doi.org/10.3390/app11041869.

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A diagonal arch bridge (DAB) is a particular case of arch bridge where the arch is rotated about a vertical axis passing through its crown so that each springing lies on a different side of the deck. A perpendicular arch bridge (PAB) is a particular case of DAB where the arch is rotated so that the arch plan is perpendicular to the deck axis. This paper includes a table of built bridges since 1989 and outlines the historical evolution of this type of bridge. Two main trends can be distinguished—one approach is focused on structural efficiency and the other is based on making aesthetics prevail

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Yang, Wangxing, Mingkai Xu, Wenxiang Peng, and Taoying Liu. "Optimization Study on Key Technology of Improved Arch Cover Method Construction for Underground Metro Stations Based on Similar Model Test." Applied Sciences 14, no. 10 (2024): 3982. http://dx.doi.org/10.3390/app14103982.

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To enhance comprehension of the improved arch cover construction method for underground metro stations and provide guidance for future construction techniques and programs, the paper examines the indoor improved arch cover method of construction in the underground concealed excavation station of Tianhe Road Station of Guangzhou Metro Line 10, China. It includes a similar model test of the key technology and an analysis of the evolution law of the surrounding rock stress, the law of the ground settlement, and the law of the arch top deformation after the tunnel excavation. The study found that

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Li, Junwei, Fei Xu, Xinyu Zheng, Bo Liu, Tao Bai, and Qingjingyi Tang. "Study on the Fracture Evolution Characteristics of Existing Defect Lining under Unsymmetrical Load." Sustainability 15, no. 12 (2023): 9531. http://dx.doi.org/10.3390/su15129531.

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In order to explore the fracture evolution characteristics of existing defect lining structures under unsymmetrical loads, unsymmetrical failure model tests of three working conditions, namely, intact lining, vault defect, and arch waist defect, were carried out. Acoustic emission (AE) technology was used to detect the lining cracks from microscopic to macroscopic. The relationship between the accumulated energy of AE and the relative load was established, and a fracture evolution model of lining based on the cumulative energy of AE was proposed. The results show that the failure process of th

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Guo, Yanhui, Shunyin Li, Shilin Mao, et al. "Study on Catastrophic Evolution Law of Water and Mud Inrush in Water-Rich Fault Fracture Zone of Deep Buried Tunnel." Buildings 14, no. 7 (2024): 2220. http://dx.doi.org/10.3390/buildings14072220.

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To study the evolution law of water and mud inrush disasters in the fractured zones of water-rich faults in deep buried tunnels, a self-developed 3D physical model test system was used to conduct experimental research about the evolution process. Additionally, MIDAS GTS NX 2022 version was used to analyze the evolution laws of displacement, stress, pore water pressure, and seepage flow velocity during the excavation process. The findings indicate that in the model testing, tunnel excavation caused different changes in the stress magnitude of the surrounding rock at different positions. The por

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Hou, Chunyao, Dong Chai, Heng Cheng, Shaoqing Ning, Bo Yang, and Yi Zhou. "Simulation Feedback of Temperature Field of Super-High Arch Dam during Operation and Its Difference with Design Temperature." Water 14, no. 24 (2022): 4028. http://dx.doi.org/10.3390/w14244028.

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Temperature is one of the main loads of super-high arch dams. (1) Background: a super-high arch dam in southwest China was taken as an example in this paper and the temporal-spatial evolution law of dam temperature was analyzed based on the monitoring data. (2) Methods: the finite element simulation analysis method was adopted to invert the boundary conditions of temperature on the upstream surface and the thermal parameters of the concrete, and the temperature evolution process of the arch dam in long-term operation was simulated and analyzed. After the distribution characteristics of the des

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Yang, Ke, Qiang Fu, Qinjie Liu, Xiang He, and Xin Lyu. "Evolution of Mining-Induced Stress in Downward Mining of Short-Distance Multiseam." Geofluids 2022 (March 4, 2022): 1–14. http://dx.doi.org/10.1155/2022/3305734.

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The strong disturbance of upward mining of the short-distance multiseam results in frequent fractures in the coal seam to be mined, jeopardizing the operation safety due to the instability of the surrounding rock of the overlying stope and risks of coal and gas outburst. A lucrative alternative is the downward mining of multiseam, which wide implementation is limited by the lack of reliable data on stress evolution characteristics. In this paper, the evolution, nonlinear interaction, and superposition characteristics of mining-induced stress after multiple pressure relief in the short-distance

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Hu, Yu, Genzhong Wang, Min Zhou, Wangjing Hu, Jin Ye, and Wenxue Gao. "Study on the Convergence of Surrounding Rock in Shallow Buried Unsymmetrical Pressure Tunnel Construction." Journal of Physics: Conference Series 2519, no. 1 (2023): 012059. http://dx.doi.org/10.1088/1742-6596/2519/1/012059.

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Abstract In order to study the evolution law of tunnel convergence deformation during the construction of shallow buried unsymmetrical pressure tunnel, the deformation characteristics and evolution law of shallow buried unsymmetrical pressure tunnel during the three-step construction method are studied based on the background of Qingshui No. 2 tunnel project and numerical simulation. The results show that: with the tunneling, when the tunneling depth is less than 40m, the settlement deformation gradually decreases, and the maximum settlement is at the entrance; When the tunnel footage is great

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Ding, Xiao, Hui He, Yonglong Qu, and Yixuan Yang. "Analysis of the Pile-Soil Combined Effect of Micropiles in Strengthening Expansive Soil Landslide in Southern Shaanxi Based on the Dynamic Soil Arch Model." Advances in Materials Science and Engineering 2022 (November 14, 2022): 1–6. http://dx.doi.org/10.1155/2022/8114708.

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Southern Shaanxi region is mountainous and landslide disasters are frequent. Micropile reinforcement technology is widely used in landslide management, especially in landslide emergency rescue projects, due to easy construction, small soil disturbance, and strong site adaptability. Soil arch effect is an important prerequisite for safe and economic performance of the support function of micropile. For the swelling soil landslide of the accumulation layer in southern Shaanxi, firstly, a numerical model is established by means of thermal-mechanical coupling of FLAC3D to explore the variation of

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Lin, Hai, Renshu Yang, Yongliang Li, and Shizheng Fang. "Stability of Coal Pillar and Roof Movement Characteristics in Roadway Backfill Mining." Advances in Civil Engineering 2021 (March 22, 2021): 1–13. http://dx.doi.org/10.1155/2021/5588923.

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In order to explore the stability of coal pillar and the characteristics of roof movement during the process of roadway backfill mining (RBM), the 301 backfilling test working face of Ordos Chahasu coal mine is taken as the background. Based on the expansive pressure arch theory, the evolution process of the stope expansive pressure arch in RBM is studied; by establishing a mechanical model for the stability of coal pillars, the interactions between the height, width, and the maximum number of branches are obtained. When the width and height of the branch are both 5 m, the optimal number of th

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Al-Kindi, Mohammed H. N. "Timing, Mechanics and Controls of the Evolution of the Southernmost Part of the Oman Mountains: The Salakh Arch." Geosciences 10, no. 3 (2020): 95. http://dx.doi.org/10.3390/geosciences10030095.

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Regional surface and subsurface mapping of the front range of the Oman Mountains, Salakh Arch’s fold-and-thrust belt, is conducted to understand the timing and nature of its deformation and to analyze the main controls on its position, geometry and evolution. The results from this study can be applied to other fold-and-thrust belts, as the area offers surface and subsurface datasets that allow good understanding of its evolution history. The deformation of the outcropping Middle Miocene to Pliocene deposits and the displacement of the Cenozoic seismic reflections imply that folding and thrusti

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Wigston, Pat. "The decorative evolution of the John Adam Dining Room at Arniston House." Architectural Heritage 15, no. 1 (2004): 20–33. http://dx.doi.org/10.3366/arch.2004.15.1.20.

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Widjil Pangarsa, Galih. "Architectural Evolution in a Changing Hindu Tenggerese Community: The case of Wonokitri." Archipel 49, no. 1 (1995): 161–84. http://dx.doi.org/10.3406/arch.1995.3042.

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Shi, Gui-Qin, Quan-You Yu, and Ze Zhang. "ANNOTATION AND EVOLUTION OF THE ANTIOXIDANT GENES IN THE SILKWORM, Bombyx mori." Archives of Insect Biochemistry and Physiology 79, no. 2 (2012): 87–103. http://dx.doi.org/10.1002/arch.21014.

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Brattsten, Lena B. "Bioengineering of crop plants and resistant biotype evolution in insects: Counteracting coevolution." Archives of Insect Biochemistry and Physiology 17, no. 4 (1991): 253–67. http://dx.doi.org/10.1002/arch.940170408.

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Mao, Liang Yan, Chang Qing Wang, and Li Yong Zhang. "Analysis to Evolution of Numerical Simulation to the Whole Process of Destroy for Main Arch of Stone Arch Bridge." Applied Mechanics and Materials 361-363 (August 2013): 1150–54. http://dx.doi.org/10.4028/www.scientific.net/amm.361-363.1150.

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6m arch board used as test object, this paper introduces the arch in different level of load board cracks, development and production of plastic hinge until the whole process for all the damage simulation numerical simulation analysis then compared with experimental results and analysis of increased with load crack distribution, which can be used to understand the similar in service work condition of the stone bridge.

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Hovorakova, Maria, Oldrich Zahradnicek, Martin Bartos, et al. "Reawakening of Ancestral Dental Potential as a Mechanism to Explain Dental Pathologies." Integrative and Comparative Biology 60, no. 3 (2020): 619–29. http://dx.doi.org/10.1093/icb/icaa053.

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Synopsis During evolution, there has been a trend to reduce both the number of teeth and the location where they are found within the oral cavity. In mammals, the formation of teeth is restricted to a horseshoe band of odontogenic tissue, creating a single dental arch on the top and bottom of the jaw. Additional teeth and structures containing dental tissue, such as odontogenic tumors or cysts, can appear as pathologies. These tooth-like structures can be associated with the normal dentition, appearing within the dental arch, or in nondental areas. The etiology of these pathologies is not well

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Edwards, Camilla, and David Edwards. "The Evolution of the Shouldered Arch in Medieval Islamic Architecture." Architectural History 42 (1999): 68. http://dx.doi.org/10.2307/1568705.

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Shon, Sudeok, and Junhong Ha. "Parameter Estimation of Shallow Arch Using Quantum-Inspired Evolution Algorithm." Journal of The korean Association For Spatial Structures 20, no. 1 (2020): 95–102. http://dx.doi.org/10.9712/kass.2020.20.1.95.

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Georgakilas, A. A., Th G. Zachariadis, and C. E. Alissandrakis. "Evolution of an active region and associated H? arch structures." Solar Physics 146, no. 2 (1993): 241–58. http://dx.doi.org/10.1007/bf00662012.

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Huang, R. F., C. Y. Ho, and J. K. Chen. "Pulsatile Flow Patterns and Wall Shear Stresses in Arch of a Turn-Around Tube With/Without Stenosis." Journal of Mechanics 27, no. 1 (2011): 79–94. http://dx.doi.org/10.1017/jmech.2011.10.

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ABSTRACTThe temporal/spatial evolution processes of the flow pattern, velocity distribution, and wall shear stress of pulsatile water flows in the arch of 180o turn-around tubes with/without stenosis were experimentally studied by using the particle image velocimetry (PIV). Three transparent tubes made of glass were used: A tube without stenosis in the arch, a tube with a 25% stenosis at the inner wall of arch, and a tube with a 50% stenosis at the inner wall of arch. Here the percentage of stensis denoted the ratio between the stenosis height to inner diameter of arch in the diametral cross s

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Zhao, Linshuang, Daming Yang, Lihui Sun, Jiabo Xu, and Yun Sun. "Research on the Evolutionary Law of Fracture Formation in Loose Seams Under High-Intensity Mining with Shallow Depth." Applied Sciences 14, no. 20 (2024): 9615. http://dx.doi.org/10.3390/app14209615.

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The western mining regions of China, known for shallow-buried and high-intensity mining activities, face significant ecological threats due to damage to loose strata and the surface. The evolution of fissures within the loose layer is a critical issue for surface ecological environment protection in coal mining areas. The study employed field measurements, mechanical experiments, numerical simulations, and theoretical analysis, using the ‘triaxial consolidation without drainage’ experiment to assess the physical and mechanical properties of various strata in the loose layer. Additionally, the

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Leucci, Giovanni, Raffaele Persico, Lara De Giorgi, et al. "Stability Assessment and Geomorphological Evolution of Sea Natural Arches by Geophysical Measurement: The Case Study of Wied Il-Mielah Window (Gozo, Malta)." Sustainability 13, no. 22 (2021): 12538. http://dx.doi.org/10.3390/su132212538.

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The Wied il-Mielaħ Window (Gozo–Malta) is a limestone natural arch on the north-western coast of the island of Gozo in Malta. It is located at the end of the Wied il-Mielaħ valley north of the village of Għarb. This natural arch is less well known than the Azure Window, which collapsed in March 2017 following a heavy storm, but notwithstanding, it is an imposing and important natural monument too. In the past, the Wied il-Mielah valley was responsible for discharging wastewater from the surrounding localities to the Mediterranean directly at the Wied il-Mielah Window. The sewage flag was often

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Li, Peng, Yonglu Suo, Peilin Gong, et al. "Evolution Mechanism and Control of Floor Heave in the Deep Roadway with Retained Bottom Coal." Geofluids 2023 (March 22, 2023): 1–16. http://dx.doi.org/10.1155/2023/3658141.

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Roadways with retained bottom coal are common in thick coal seam mining, and floor heaving is a prominent problem. In this study, based on the interaction between the floor and two sides of the roadway-surrounding rock, a Winkler elastic foundation beam model is established to analyze the floor heave problem. A 3DEC model was used to analyze the failure range, failure mode, and migration law of the floor-surrounding rock with different bottom coal thicknesses and coal body strengths. The results show that (1) an increase in the thickness of the bottom coal results in a decrease in the stiffnes

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Cheng, Guo Qiang, and Yan Jin Song. "The Evolution Rules of Overlying Strata Porosity Influenced by Mining Activation." Advanced Materials Research 282-283 (July 2011): 21–25. http://dx.doi.org/10.4028/www.scientific.net/amr.282-283.21.

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Rock is a type of natural material containing microcracks. The evolution of mining-induced fracture field is one of the main problems of gas comprehensive control and rock mass seepage. The distribution of fissures and porosity in overlying strata under the mining influence were studied in this paper. The stratum subsidence was represented quantitatively using elastic thin plate theory and key strata theory. Based on the stratum subsidence, a program calculating porosity in overlying strata was developed based on VB. The results demonstrate that the porosity increase with face advances. The po

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