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Study on Coal Seam Roof Gas Drainage from the Strike of Annular Fracture Areas by the Long Drill Method

Liu Zegong,Yuan Liang,Dai Guanglong,Shi Biming,Lu Ping,Tu Min

Strategic Study of CAE 2004, Volume 6, Issue 5, Pages 32-38

Abstract: If gob gas suction is adopted in a large area,the project will prove not only extremely difficult,butaisles of the full development areas and gather in annular fracture areas.numerical simulation and the in-situ study are applied in this work in order to find the location of annularfracture areas in overlying formation.The long-drill mehtod for gas suction along the strike of annular fracture areas is adopted.

Keywords： coal seam similar material experiment numerical simulation gas drainage annular fracture area

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Recent progress in hydrodynamic characteristics research and application of annular centrifugal extractors

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 6, Pages 854-873 doi: 10.1007/s11705-022-2156-0

Abstract: The annular centrifugal extractor (ACE) integrates mixing and separation.

Keywords： annular centrifugal extractor hydrodynamic characteristics structure optimization the latest application

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Flow characteristics of single-phase flow in narrow annular channels

ZENG Heyi, SU Guanghui, JIA Dounan

Frontiers in Energy 2008, Volume 2, Issue 4, Pages 466-470 doi: 10.1007/s11708-008-0101-7

Abstract: The characteristics of single-phase flow in narrow annular channels were analyzed and theoretical modelremarkable the effect of gap size upon friction coefficient during single-phase flowing through narrow annular

Keywords： narrow annuli remarkable mm developed friction

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Selective reduction of NO by photo-SCR with ammonia in an annular fixed-film photoreactor

YiangChen CHOU, Young KU

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 2, Pages 149-155 doi: 10.1007/s11783-010-0296-9

Abstract: Gaseous NO was photocatalytically reduced at room temperature by photo-assisted selective catalytic reduction (photo-SCR) with ammonia over TiO in this study. NO reduction efficiency and N selectivity were determined from gases composition at the outlet stream of photoreactor. Effect of operating conditions, e.g. light intensity and inlet concentrations of ammonia and oxygen, on the NO reduction efficiency and N selectivity were discussed to determine the feasible operating condition for photocatalytic reduction of NO. Experimental results showed that selective catalytic reduction of NO with ammonia over TiO in the presence of oxygen was a spontaneous reaction in dark. The photoirradiation on the TiO surface caused remarkable photocatalytic reduction of NO to form N , NO , and N O under 254 nm UV illuminations, while almost 90% of N selectivity was achieved in this study. The ammonia and oxygen molecules played the roles of reductant and oxidant for NO reduction and active sites regeneration, respectively. The reduction of NO was found to be increased with the increase of inlet ammonia and oxygen concentrations until specific concentrations because of the limited active sites on the surface of TiO . The kinetic model proposed in this study can be used to reasonably describe the reaction mechanism of photo-SCR.

Keywords： photo-SCR photocatalysis NO reduction Eley-Rideal model

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Optimal Design of Aperture Illuminations for Microwave Power Transmission with Annular Collection Areas Article

Xun Li, Baoyan Duan, Yiqun Zhang, Yongxin Guo

Engineering 2023, Volume 30, Issue 11, Pages 63-74 doi: 10.1016/j.eng.2023.07.016

Abstract: an optimal design method of antenna aperture illumination for microwave power transmission with an annularcollection area.The objective is to maximize the ratio of the power radiated on the annular collection area to the totalTo meet security requirements, the peak radiation levels outside the receiving area are considered to

Keywords： Microwave power transmission Beam collection efficiency Ring-shaped beam Annular collection area

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Stability of an annular viscous liquid jet in compressible gases with different properties inside and

Chunji YAN, Maozhao XIE,

Frontiers in Energy 2010, Volume 4, Issue 2, Pages 198-204 doi: 10.1007/s11708-009-0054-5

Abstract: A spatial linear instability analysis is conducted on an annular viscous liquid jet injected into compressible

Keywords： liquid jet dominant wave number compressibility instability

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Numerical investigation on the dryout point of annular flow in the upward narrow annuli with bilateral

SU Guanghui, QIU Suizheng, DUAN Feng, XIAO Zejun, HUANG Yanping

Frontiers in Energy 2007, Volume 1, Issue 3, Pages 264-272 doi: 10.1007/s11708-007-0037-3

Abstract: vapor core, a theoretical three-fluid model has been developed to predict the dryout point of upward annular

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Tests on impact effect of partial fracture at steel frame connections

CHEN Yiyi, BIAN Ruoning

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 4, Pages 295-301 doi: 10.1007/s11709-008-0049-z

Abstract: Impact effect of sudden fracture at steel frame connections under severe earthquake or other extremeThe relation of impulse caused by structural fracture to the release of inner force at the cracked locationIt is also revealed that the instant fracture of structural connection is characterized by progressiveand partial fracture.Numerical evaluation of the impact effect of connection fracture is carried out.

Keywords： structural fracture natural fracture progressive high-frequency

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Effect of fly ash replacement level on the fracture behavior of concrete

Mahdi AREZOUMANDI, Jeffery S. VOLZ

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4, Pages 411-418 doi: 10.1007/s11709-013-0228-4

Abstract: results of an experimental investigation that evaluates effect of fly ash replacement level on the fractureThis experimental program consisted of 32 fracture beams to study the fracture behavior of concrete.The experimental fracture energies were compared with the fracture energy provisions of different designevaluate whether or not there is any statistically significant difference between the experimental fracturethese statistical tests show that the mix with higher level of fly ash replacement level has higher fracture

Keywords： concrete fracture energy fly ash

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Computational modeling of fracture in concrete: A review

Luthﬁ Muhammad Mauludin, Chahmi Oucif

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3, Pages 586-598 doi: 10.1007/s11709-020-0573-z

Abstract: This paper presents a review of fracture modeling of concrete.Based on comprehensive literature review, there are two main approaches considered to-date of concrete fractureThe purpose of this review is to provide insight comparison from different techniques in modeling of fractureIn the first section, an overview of fracture modeling in general is highlighted.

Keywords： concrete fracture macroscopic micromechanical heterogeneity

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Computational modeling of fracture in capsule-based self-healing concrete: A 3D study

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6, Pages 1337-1346 doi: 10.1007/s11709-021-0781-1

Abstract: We present a three-dimensional (3D) numerical model to investigate complex fracture behavior using cohesivepre-inserted cohesive elements are also applied into the initial meshes of solid elements to account for fractureThe proposed model provides an effective tool for predicting the complex fracture response of capsule-based

Keywords： 3D fracture self-healing concrete spherical cohesive elements heterogeneous

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Evaluating the material strength from fracture angle under uniaxial loading

Jitang FAN

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2, Pages 288-293 doi: 10.1007/s11709-018-0480-8

Abstract: Generally, shearing fracture model occurs in both the tests.Shearing fracture angle is smaller than 45° under uniaxial compression and greater than 45° under uniaxialof material strength under uniaxial compression and tension is developed by correlating the shearing fracturerelation is quantitatively illustrated by a function for analyzing the material strength from shear fracture

Keywords： strength fracture mechanics

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A dimensional analysis on asphalt binder fracture and fatigue cracking

Qian ZHAO, Zhoujing YE

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 2, Pages 201-206 doi: 10.1007/s11709-017-0402-1

Abstract: Fracture and fatigue cracking in asphalt binder are two of most serious problems for pavement engineersconsists both of dimensional analysis using Buckingham Theorem and -integral analysis based on classic fracturemechanics, to evaluate the fracture and fatigue on asphalt binder.is discovered that the dimensional analysis could provide a new perspective to analyze the asphalt fracture

Keywords： Dimensional analysis asphalt fracture fatigue cracking

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Experimental research on ductile fracture criterion in metal forming

Song YU, Weiming FENG

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3, Pages 308-311 doi: 10.1007/s11465-011-0233-z

Abstract:

Ductile fracture criterion is key limitation parameter in material forming.shearing test on 45# steel are utilized for providing the experimental values of the critical values at fracture, and 11 widely used ductile fracture criterion are selected to simulate the physical experiments andtheir relative accuracy for predicting and quantifying fracture initiation sites are investigated.triaxiality can be estimated successively using both Normalized Cockcroft-latham and the Brozzo ductile fracture

Keywords： ductile fracture criteria metal forming process material experiment stress triaxiality

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Hybrid deep learning model for risk prediction of fracture in patients with diabetes and osteoporosis

Frontiers of Medicine 2022, Volume 16, Issue 3, Pages 496-506 doi: 10.1007/s11684-021-0828-7

Abstract: The fracture risk of patients with diabetes is higher than those of patients without diabetes due toIn addition, the fracture risk of patients with diabetes and osteoporosis has not been further studiedIn this paper, a hybrid model combining XGBoost with deep neural network is used to predict the fracturepatients with diabetes and osteoporosis, and investigate the effect of patients’ physiological factors on fractureMoreover, the top 18 influencing factors of fracture risks of patients with diabetes are determined.

Keywords： XGBoost deep neural network healthcare risk prediction