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Theoretical prediction of wear of disc cutters in tunnel boring machine and its application

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第1期11卷 111-120页

作者： Zhaohuang Zhang muhammad aqeel Cong Li Fei Sun School of Energy Power and Mechanical Engineering North China Electric Power University School of Foreign Languages North China Electric Power University

Predicting the cutter consumption and the exact time to replace the worn-out cutters in tunneling projects constructed with tunnel boring machine(TBM) is always a challenging issue. In this paper, we focus on the analyses of cutter motion in the rock breaking process and trajectory of rock breaking point on the cutter edge in rocks. The analytical expressions of the length of face along which the breaking point moves and the length of spiral trajectory of the maximum penetration point are derived. Through observation of rock breaking process of disc cutters as well as analysis of disc rock interaction, the following concepts are proposed: the arc length theory of predicting wear extent of inner and center cutters, and the spiral theory of predicting wear extent of gage and transition cutters. Data obtained from5621 m-long Qinling tunnel reveal that among 39 disc cutters, the relative errors between cumulatively predicted and measured wear values for nine cutters are larger than 20%, while approximately 76.9% of total cutters have the relative errors less than 20%. The proposed method could offer a new attempt to predict the disc cutter's wear extent and changing time.

关键词： Full-face rock tunnel boring machine(TBM) Disc cutter Wear prediction

提高风电叶片风能利用和转化率的新理论和新方法——风力发电叶片出流角计算公式的建立及应用

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应用基础与工程科学学报 2017年第5期25卷 1040-1047页

作者：张照煌 muhammad aqeel 刘青华北电力大学能源动力与机械工程学院北京102206

提高风力发电机组的风能利用和转化率一直是风电领域专家研究的热点和难题.文中以动量定律为基本理论,通过分析流动空气与风力发电叶片迎风面和背风面的相互作用,发现了流动空气流出叶片的方向对风能利用和转化率有较大影响.因此,提出... 详细信息

提高风力发电机组的风能利用和转化率一直是风电领域专家研究的热点和难题.文中以动量定律为基本理论,通过分析流动空气与风力发电叶片迎风面和背风面的相互作用,发现了流动空气流出叶片的方向对风能利用和转化率有较大影响.因此,提出了提高风力发电叶片风能利用和转化率的流动空气从风力发电叶片迎风面流出角的确定理论和相应公式及流动空气从风力发电叶片背风面后缘流出角的确定理论和相应公式,从而为风力发电机组风能利用和转化率的提高提出了新的研究思路.文中的研究方法和结论将为风力发电叶片风能利用和转化率的提高提供借鉴和有益尝试.

关键词：风力发电叶片风能利用率

Effects of Lateral Variation in Vegetation and Basin ‘Dome' Shape on Tropical Lowland Peat Stabilisation in the Kota Samarahan-Asajaya Area, West Sarawak, Malaysia

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Acta Geologica Sinica(English Edition) 2014年第3期88卷 894-914页

作者： Mohamad Tarmizi Mohamad ZULKIFLEY Tham Fatt NG John Kuna RAJ Roslan HASHIM muhammad aqeel ASHRAF Department of Geology Faculty of Science University of Malaya Department of Civil Engineering Faculty of Science University of Malaya

Field surveys indicate lateral variation in peat humification levels （von Post） in dominantly occurring fibric,fibric to hemic,sapric and hemie to sapric peats across a gradient from the margin towards the centre of tropical lowland peat ***-peat stabilisation can be enhanced by adding mineral soil fillers （silt,clays and fine sands） obtained from Quaternary floodplain deposits and residual soil （weathered schist）.The unconfined compressive strength （UCS） of the stabilised cement-mineral soil fifler-peat mix increases with the increased addition of selected mineral soil *** variation in the stabilised peat strength （UCS） in the top 0 to 0.5 m layer was found from the margin towards the centre of the tropical lowland peat *** variations in the UCS of stabilised tropical lowland peats along a gradient from the periphery towards the centre of the peat dome are most likely caused by a combination of factors due to variations in the mineral soil or ash content of the peat and horizontal zonation or lateral variation in the dominant species of the plant assemblages （due to successive vegetation zonation of the peat swamp forest from the periphery towards the centre of the tropical lowland peat dome）.

关键词： tropical lowland peat dome/basin mineral soil filler cement-filler-peat stabilisation,topogenic unconfined compressive strength lateral vegetation succession.

Impacts of chicken manure and peat-derived biochars and inorganic P alone or in combination on phosphorus fractionation and maize growth in an acidic ultisol

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Biochar 2019年第3期1卷 283-291页

作者： muhammad aqeel Kamran Ren-Kou Xu Jiu-yu Li Jung Jiang Ren-Yong Shi State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesP.O.Box 821NanjingChina University of Chinese Academy of Sciences Beijing 100049China

The forms of phosphorus(P)in animal manure and peat are different from synthetic P fertilizers and will affect soil P fractions when they are used as P *** of chicken manure(CMB)and peat(PB)derived biochars(CMB and PB)alone or in combination with P fertilizer(KH_(2)PO_(4))and rock phosphate(RP)on plant/soil health and soil P fractions in an acidic ultisol were examined with greenhouse pot *** total P rate was constant at 120 mg kg^(−1) in all *** P fractions,P uptake,and maize growth were determined after 56 *** of CMB combined with P fertilizer or alone significantly increased soil pH,water extractable and relatively labile P,dry matter yield of maize,chlorophyll contents in maize leaves,while decreasing the Fe and Al binding ***,sole application of CMB and PB showed greater effects than application of P fertilizer alone regarding plant growth and P *** of syn-thetic inorganic P sources with CMB or sole application of CMB is more beneficial than application of inorganic P sources to improve plant growth and P availability.

关键词： Acidic soil Manure-derived biochar Peat-derived biochar Inorganic P fertilizer P fractions Plant P uptake

Double‑Layer Nanofibrous Sponge Tube via Electrospun Fiber and Yarn for Promoting Urethral Regeneration

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Advanced Fiber Materials 2023年第2期5卷 662-680页

作者： Kaile Zhang muhammad aqeel Bhutto Liyang Wang Kai Wang Jie Liu Wenyao Li Wenguo Cui Qiang Fu The Department of Urology Shanghai Sixth People’s Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai Jiao Tong UniversityShanghai 200233People’s Republic of China Institute of Biotechnology and Genetic Engineering University of SindhJamshoro 76080Pakistan School of Materials Science and Engineering Shanghai University of Engineering ScienceShanghai 201620People’s Republic of China Clinical Research Center Shanghai Chest HospitalShanghai Jiao Tong UniversityShanghai 200233People’s Republic of China Regenerative Medicine Research Center The First People’s Hospital of Yunnan ProvinceThe Affiliated Hospital of Kunming University of Science and TechnologyKunming 650000People’s Republic of China Shanghai Institute of Traumatology and Orthopaedics Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint DiseasesRuijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025People’s Republic of China

Insufficient bionic performance is a structural obstacle and makes urethral repair *** overcome this challenge,we mimicked the urethral matrix and applied two electrospinning techniques to build a double-layer sponge tube of nanofib-ers and ***,silk fibroin(SF)and vitamin B5(VitB5)could be introduced to increase the elasticity of the outer layer and reduce the hydrophobicity to further improve mesenchymal cell *** experiments validated the bionic structure,biocompatibility,and exosome delivery capacity in this *** achieved scarless urethral repair by delivering the bioactive growth factors from adipose-derived stem cell exosomes by physical *** regeneration of the urethra can be accomplished with continuous epithelium in ***,bioinformatics studies revealed that the expression of cell proliferation and fibrotic genes(e.g.,Wnt7a,cfa-miR-574)was responsible for the bio-logical regeneration of the adipose-derived stem cells exosomes(ADSC-exos)by delivering poly l-lactide-co-caprolactone/SF/VitB5 bilayer sponge(PSVBS)via reduced fibrosis gene expression,as well as improved epithelial formation and blood vessel ***,the PSVBS design appeared to be an instructive approach for urethral and other tubular organ regeneration.

关键词： Electrospinning Nanofiber Nanoyarn Urethral stricture Urethral reconstruction

Analogy Theory and Application of Pressure Difference of Wind Turbine Blade Profile

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Journal of Harbin Institute of Technology(New Series) 2020年第6期27卷 72-82页

作者： Zhaohuang Zhang aqeel muhammad Jun Zhang Qing Liu Weiwei Li Yuwang Song School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing 102206China

This paper aims to design an optimized blade for Horizontal Axis Wind Turbine(HWAT).Since airfoil is a basic component of blade design,an optimized airfoil(referred as SJX)was proposed based on the line theory through the weight analogy to pressure distribution of air *** lift,drag,lift⁃to⁃drag ratio were compared with those NACA2409⁃34,NACA2410,and RK40 airfoils by using Profili software at fixed wind velocity and under different angles of *** NACA2409⁃34 airfoil was found to be greatly similar with the SJX *** on the Wilson method,blades using SJX and NACA2490⁃34 airfoils were developed and different performance parameters such as velocity distribution,pressure distribution,and power were compared under variable wind velocities and different angles of attack ranging from-4°to 6°at different radius from the center of rotor using computational fluid dynamics(CFD)in ANSYS *** of the study suggested that the performance of the SJX based airfoil and blade was much more optimized.

关键词： wind turbine blade analogy theory of pressure difference airfoil profile lift to drag ratio airfoil design

AN OVERVIEW OF ADVANCED CONCEPT FOR CIRCULAR RESTRICTED THREE BODY PROBLEM

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AN OVERVIEW OF ADVANCED CONCEPT FOR CIRCULAR RESTRICTED THRE...

Termites Improve the Horizontal Movement of Carbonized Particles:A Step towards Sustainable Utilization of Biochar

第十三届全国非线性振动暨第十届全国非线性动力学和运动稳定性学术会议

作者： muhammad aqeel Department of Mechanics School of Aerospace EngineeringBeijing Institute of Technology

A brief review of advanced concept for circular restricted three body problem(CRTBP)has been presented in this research *** dynamical astronomy CRTBP is one of the most important models to investigate dynamical behavior of the planets or their secondary planets in solar *** three body problem is one of oldest problem in dynamical *** problem was designed to determine the behavior of three interacting *** system models the motion of small body in the field of two much larger bodies whose relative motion is *** scenario is good for modeling the trajectories of spacecraft in the gravitational potential of two massive *** review introduces a reduction of general three body dynamics which is often useful in application and which is an active area of dynamical system research in its own *** focus of this research effort is the identification of some of new trajectory option,and the development of methodologies to aid in the design of mission utililizing these *** trajectory design that is needed most is from a low earth orbit to an orbit about a Lagrange *** best solution to trajectory design would be found in a general solution to the three body *** way to address the three body problem is to look at the manifold within the dynamical *** this research we used manifold and dynamical systems theory to develop trajectories because they are based on the dynamics of the three body problem and will help in better understanding how to develop trajectories using the smallest cost *** Lagrange equilibrium solutions of CRTBP have turned out to be much more important than they seemed at a first *** have many space *** will likely play a much more important role for future space exploration *** approach,using manifold,gives better understanding of trajectories from a Lagrange point toward a primary body in the three body problem.

关键词： Three body problem Manifold Lagrange points.

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Phyton-International Journal of Experimental Botany 2022年第10期91卷 2235-2248页

作者： Mazhar Ali Nasir Masood Hafiz muhammad Rashad Javeed Ibrahim Al-Ashkar Khalid F.Almutairi Liyun Liu muhammad aqeel Sarwar Karthika Rajendran Ayman EL Sabagh Department of Environmental Sciences COMSATS University IslamabadVehari CampusVehari61100Pakistan Department of Plant Production College of Food and AgricultureKing Saud UniversityRiyadh11451Saudi Arabia Graduate School of Integrated Sciences for Life Hiroshima UniversityHiroshima739-8528Japan Crop Sciences Institute National Agricultural Research CentreIslamabad44000Pakistan VIT School of Agricultural Innovations and Advanced Learning(VAIAL) Vellore Institute of Technology(VIT)Vellore632014India Department of Agronomy Faculty of AgricultureKafrelsheikh UniversityKafr El-Shaikh33516Egypt

Soil amendments containing carbonized materials increase the soil carbon reservoir,influence plant productivity,and,ultimately,help to clean the *** is data on the effect of such additions on soil physicochemical properties or plant growth,but few studies have focused on how these carbonized materials are distributed by termite species in the soil *** is the first comprehensive study of the transportation of biochar(BC)by termite species under tropical environmental conditions in *** present study was carried out to test the hypothesis that if termite species I)were involved in the distribution of biochar particles II)if yes,then how far these particles were transported during the study period(10 days)and III)check their preference between the enriched BC(EBC)and non-enriched *** was enriched with the cattle slurry after its pyrolysis in the *** results showed that EBC particles were significantly more widely distributed than non-enriched BC particles,but both types of BC were transported more than 4 cm(ring 4)within 10 days(at the end of the experiment).The current study also revealed that EBC was easily attached to the setae,cuticle,and legs of termites,implying that it could potentially be transported over a greater ***,transportation of EBC over larger distances indicated a potential preference of termite species between the EBC and BC *** the study,however,the preference among the termite species was also *** the prevailing study conditions,the Coptotermes heimi and Heteroterme indicola species transported the EBC further than Microtermes obesi and Odontotermes *** findings revealed that transportation preferences were observed among the four termite *** conclusion,the current study found that termites were involved in the distribution of BC particles,with a preference for EBC and that these have the potential to transport BC particles more than 4 cm within 10 da

关键词： Enriched biochar termite species distribution micro-particles feeding stations soil productivity

Fabrication and characterization of Antheraea pernyi silk fibroin-blended P（LLA-CL） nanofibrous scaffolds for peripheral nerve tissue engineering

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Frontiers of Materials Science 2017年第1期11卷 22-32页

作者： Juan WANG Binbin SUN muhammad aqeel BHUTTO Tonghe ZHU Kui YU Jiayu BAO Yosry MORSI Hany EL-HAMSHARY Mohamed EL-NEWEHY Xiumei MO State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Chemistry Chemical Engineering and Biotechnology Donghua University Shanghai 201620 China Shandong International Biotechnology Park Development Co. Ltd. Yantai 264670 China College of Materials Science and Engineering Donghua University Shanghai 201620 China Faculty of Engineering and Industrial Sciences Swinburne University of Technology Hawthorn Vic 3122 Australia Department of Chemistry College of Science King Saud University Riyadh 11451 Saudi Arabia Department of Chemistry Faculty of Science Tanta University Tanta 31527 Egypt

Electrospun nanofibers have gained widespreading interest for tissue engineering application. In the present study, ApF/P（LLA-CL） nanofibrous scaffolds were fabricated via electrospinning. The feasibility of the material as tissue engineering nerve scaffold was investigated in vitro. The average diameter increased with decreasing the blend ratio of ApF to P（LLA-CL）. Characterization of 13C NMR and FTIR clarified that there is no obvious chemical bond reaction between ApF and P（LLA-CL）. The tensile strength and elongation at break increased with the content increase of P（LLA-CL）. The surface hydrophilic property of nanofibrous scaffolds enhanced with the increased content of ApF. Cell viability studies with Schwann cells demonstrated that ApFIP（LLA-CL） blended nanofibrous scaffolds significantly promoted cell growth as compare to P（LLA-CL）, especially when the weight ratio of ApF to P（LLA-CL） was 25：75. The present work provides a basis for further studies of this novel nanofibrous material （ApF/P（LLA-CL）） in peripheral nerve tissue repair or regeneration.

关键词： KEYWORDS: ApFIP(LLA-CL) electrospinning nanofibers scaffolds Schwann cells peripheral nerve tissue engineering