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CFD model simulation of bubble surface area flux in flotation column reactor in presence of minerals

International Journal of Mining Science and Technology 2018年第6期28卷 999-1007页

作者： A.R.Sarhan J.Naser g.brooks Department of Mechanical and Product Design Engineering Swinburne University of TechnologyHawthornVictoria 3122Australia Department of Mechanical Engineering University of Anbar RamadiAnbar 31001Iraq

Bubble surface area flux(S_b) is one of the main design parameter in flotation column that typically employed to describe the gas dispersion properties, and it has a strong correlation with the flotation rate constant. There is a limited information available in the literature regarding the effect of particle type,density, wettability and concentration on Sb. In this paper, computational fluid dynamics(CFD) simulations are performed to study the gas–liquid–solid three-phase flow dynamics in flotation column by employing the Eulerian–Eulerian formulation with k-e turbulence model. The model is developed by writing Fortran subroutine and incorporating then into the commercial CFD code AVL FIRE, *** paper studies the effects of superficial gas velocities and particle type, density, wettability and concentration on Sband bubble concentration in the flotation column. The model has been validated against published experimental data. It was found that the CFD model was able to predict, where the response variable as indicated by R-Square value of 0.98. These results suggest that the developed CFD model is reasonable to describe the flotation column reactor. From the CFD results, it is also found that Sb decreased with increasing solid concentration and hydrophobicity, but increased with increasing superficial gas velocity. For example, approximately 28% reduction in the surface area flux is observed when coal concentration is increased from 0 to 10%, by volume. While for the same solid concentration and gas flow rate, the bubble surface area flux is approximately increased by 7% in the presences of sphalerite.A possible explanation for this might be that increasing solid concentration and hydrophobicity promotes the bubble coalescence rate leading to the increase in bubble size. Also, it was found that the bubble concentration would decrease with addition of hydrophobic particle(i.e., coal). For instance, under the same operating conditions, approximately 23% reduc

关键词： CFD Froth flotation Bubble surface area flux Solid properties Bubble concentration

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Highly Efficient and Stable FAPbI_(3) Perovskite Solar Cells and Modules Based on Exposure of the(011)Facet

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Nano-Micro Letters 2023年第9期15卷 164-174页

作者： Kai Zhang Bin Ding Chenyue Wang Pengju Shi Xianfu Zhang Cheng Liu Yi Yang Xingyu gao Rui Wang Li Tao Keith g.brooks Songyuan Dai Paul J.Dyson Mohammad Khaja Nazeeruddin Yong Ding Beijing Key Laboratory of Novel Thin-Film Solar Cells North China Electric Power UniversityBeijing 102206People’s Republic of China Institut des Sciences et Ingénierie Chimiques Ecole Polytechnique Fédérale de Lausanne(EPFL)Lausanne 1015Switzerland Shanghai Synchrotron Radiation Facility(SSRF) Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204People’s Republic of China School of Engineering Westlake University and Institute of Advanced TechnologyWestlake Institute for Advanced StudyHangzhou 310024People’s Republic of China Hubei Yangtze Memory Laboratories Wuhan 430205People’s Republic of China School of Microelectronics Hubei UniversityWuhan 430062People’s Republic of China

Perovskite crystal facets greatly impact the performance and stability of their corresponding photovoltaic *** to the(001)facet,the(011)facet yields better photoelectric properties,including higher conductivity and enhanced charge carrier ***,achieving(011)facet-exposed films is a promising way to improve device ***,the growth of(011)facets is energetically unfavorable in FAPbI_(3) perovskites due to the influence of methylammonium chloride ***,1-butyl-4-methylpyridinium chloride([4MBP]Cl)was used to expose(011)***[4MBP]^(+)cation selectively decreases the surface energy of the(011)facet enabling the growth of the(011)***[4MBP]^(+)cation causes the perovskite nuclei to rotate by 45°such that(011)crystal facets stack along the out-of-plane ***(011)facet has excellent charge transport properties and can achieve better-matched energy level *** addition,[4MBP]Cl increases the activation energy barrier for ion migration,suppressing decomposition of the *** a result,a small-size device(0.06 cm2)and a module(29.0 cm2)based on exposure of the(011)facet achieved power conversion efficiencies of 25.24%and 21.12%,respectively.

关键词： Renewable energy Perovskite solar cell Perovskite solar module Facet engineering

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A Multi-gait Approach for Humanoid Navigation in Cluttered Environments

A Multi-Gait Approach for Humanoid Navigation in Cluttered E...

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第26届中国控制与决策会议

作者： g.brooks P.Krishnamurthy F.Khorrami Control/Robotics Research Laboratory (CRRL) Dept.of ECEPolytechnic Institute of NYU

A multi-gait approach is proposed in this paper for autonomous humanoid robot navigation and obstacle avoidance in unknown complex cluttered environments. The proposed approach is based on an environment-dependent adaptive switching between multiple gait strategies including, in particular, a new low-profile crawling gait that enables humanoid motion in tight vertically constrained spaces in addition to forward walking and side-stepping gaits. The path planning and obstacle avoidance system is based on the gODZILA algorithm that provides a computationally lightweight approach for navigation in unknown environments without requiring building of an environment map. The new low-profile crawling gait is laterally symmetric and utilizes a cooperative motion of both the hands and feet. The addition of this gait expands the set of environments that can be handled by the humanoid robot. The efficacy of the proposed approach is demonstrated through simulations and experimental studies on a NAO humanoid robot.

关键词： Humanoid NAO Biped Obstacle Avoidance Path Planning Low-Profile gaits Adaptive gaiting

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Plant Promoters and Terminators for High-Precision Bioengineering

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BioDesign Research 2023年第1期5卷 86-105页

作者： Emily g.brooks Estefania Elorriaga Yang Liu James R.Duduit guoliang Yuan Chung-Jui Tsai gerald A.Tuskan Thomas g.Ranney Xiaohan Yang Wusheng Liu Department of Horticultural Science North Carolina State UniversityRaleighNC 27607USA. Biosciences Division Oak Ridge National LaboratoryOak RidgeTN 37831USA. The Center for Bioenergy Innovation Oak Ridge National LaboratoryOak RidgeTN 37831USA. Warnell School of Forestry and Natural Resource University of GeorgiaAthensGA 30602USA. Department of Plant Biology University of GeorgiaAthensGA 30602USA. Department of genetics University of GeorgiaAthensGA 30602USA. Mountain Crop Improvement Lab Department of Horticultural ScienceMountain Horticultural Crops Research and Extension CenterNorth Carolina State UniversityMills RiverNC 28759USA.

High-precision bioengineering and synthetic biology require fine-tuning gene expression at both transcriptional and posttranscriptional *** transcription is tightly regulated by promoters and *** determine the timing,tissues and cells,and levels of the expression of *** mediate transcription termination of genes and affect mRNA levels posttranscriptionally,e.g.,the 3′-end processing,stability,translation efficiency,and nuclear to cytoplasmic export of *** promoter and terminator combination affects gene *** the present article,we review the function and features of plant core promoters,proximal and distal promoters,and terminators,and their effects on and benchmarking strategies for regulating gene expression.

关键词： expression Promoter proximal

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氧气炼钢法的未来方向

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上海宝钢工程设计 2002年第4期16卷 77-82页

作者： g.brooks

让氧气和铁水紧密接触，同时还要在乳化物中形成一个大界面，这是氧气炼钢目前的局限性所在。

关键词：氧气炼钢法炼钢技术

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2018年视频营销的七个关键词

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新营销 2017年第7期19卷 70-71页

作者： James g.brooks Luke glassView

过去几年．随着网络基础设施的完善，智能设备的普及，互联网逐渐由图文步入视频时代，移动视频尤其成为捕获用户注意力的重要应用。思科（Cisco）公司的统计数据显示，2017年，视频占互联网流量的69％；2019-2020年，随着5g的到来，这... 详细信息

过去几年．随着网络基础设施的完善，智能设备的普及，互联网逐渐由图文步入视频时代，移动视频尤其成为捕获用户注意力的重要应用。思科（Cisco）公司的统计数据显示，2017年，视频占互联网流量的69％；2019-2020年，随着5g的到来，这个数字还会大幅增长。

关键词：移动视频关键词营销网络基础设施数据显示互联网注意力图文

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Challenges and opportunities in the production of magnesium parts by directed energy deposition processes

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Journal of Magnesium and Alloys 2024年第5期12卷 1663-1686页

作者： gürel Cam Ali günen Iskenderun Technical University Faculty of Engineering and Natural SciencesDepartment of Mechanical Engineering31200 Iskenderun-HatayTurkey Iskenderun Technical University Faculty of Engineering and Natural SciencesDepartment of Metallurgy and Materials Engineering31200 Iskenderun-HatayTurkey

Mg-alloys have gained considerable attention in recent years for their outstanding properties such as lightweight,high specific strength,and corrosion resistance,making them attractive for applications in medical,aerospace,automotive,and other transport ***,their widespread application is hindered by their low formability at room temperature due to limited slip *** Mg-alloys have low mechanical properties due to the presence of casting defects such as porosity and anisotropy in addition to the high *** casting methods benefit from established process optimization techniques for these problems,additive manufacturing methods are increasingly replacing casting methods in Mg alloys as they provide more precise control over the microstructure and allow specific grain orientations,potentially enabling easier optimization of anisotropy properties in certain *** metal additive manufacturing(MAM)technology also results in some manufacturing defects such as inhomogeneous microstructural evolution and porosity and additively manufactured Mg alloy parts exhibit lower properties than the wrought parts,they in general exhibit superior properties than the cast ***,MAM is a promising technique to produce Mg alloy *** energy deposition processes,particularly wire arc directed energy deposition(WA-DED),have emerged as an advantageous additive manufacturing(AM)technique for metallic materials including magnesium alloys,offering advantages such as high deposition rates,improved material efficiency,and reduced production costs compared to subtractive ***,the inherent challenges associated with magnesium,such as its high reactivity and susceptibility to oxidation,pose unique hurdles in the application of this *** review paper delves into the progress made in the application of DED technology to Mg-alloys,its challenges,and ***,the predominant imperfections,notably inhomo

关键词： Additive manufacturing DED processes Arc-DED Wire arc additive manufacturing(WAAM) 3-D printing High deposition rate

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Recent research in mechanical properties of geopolymer-based ultrahigh-performance concrete:A review

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Defence Technology（防务技术） 2024年第2期32卷 67-88页

作者： g.Murali Division of Research&Innovation Uttaranchal UniversityDehradun 248007India

Due to the growing need for sustainable and ultra-high-strength construction materials,scientists have created an innovative ultra-high-performance concrete called geopolymer based ultra-highperformance concrete(gUHPC).Besides,in the last few decades,there have been a lot of explosions and ballistic attacks around the world,which have killed many civilians and fighters in border *** this context,this article reviews the fresh state and mechanical properties of ***,the ingredients of gUHPC and fresh properties such as setting time and flowability are briefly ***,the review of compressive strength,flexure strength,tensile strength and modulus of elasticity of fibrous ***,the blast and projectile impact resistance performance was ***,the microstructural characteristics were reviewed using the scanning electron microscope and X-ray Powder *** review outcome reveals that the mechanical properties were increased when 30%silica fume was added to a higher dose of steel fibre to improve the microstructure of *** is hypothesized that the brittleness of gUHPC was mitigated by adding 1.5%steel fibre reinforcement,which played a role in the decrease of contact explosion cratering and *** the need for cement in gUHPC was a key factor in the review,indicating a promising potential for lowering carbon ***,gUHPC research is still in its early stages,so more study is required before its full potential can be utilized.

关键词： Mechanical properties Blast Projectile impact Fibre geopolymer Silica fume Alkaline activators

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Shell-model representations of the microscopic version of the Bohr-Mottelson collective model

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Communications in Theoretical Physics 2024年第8期76卷 79-90页

作者： H g ganev Joint Institute for Nuclear Research DubnaRussia Institute of Mechanics Bulgarian Academy of SciencesSofiaBulgaria

The structure of the irreducible collective spaces of the group Sp(12,R),which many-particle nuclear states are classified according to the chain Sp(12,R)⊃U(6)⊃SO(6)⊃SU_(pn)(3)⊗SO(2)⊃SO(3)of the proton-neutron symplectic model(PNSM),is considered in *** chain of the PNSM was recently shown to correspond to a microscopic shell-model version of the Bohr-Mottelson collective *** construction of the relevant shell-model representations of the Sp(12,R)group along this chain is considered for three nuclei with varying collective properties and from different mass *** is shown that the SU_(pn)(3)basis states of the Sp(12,R)representations belonging to the SO(6)irreps with seniorityυ≥υ0,withυ0 denoting the maximal seniority SO(6)irrep contained in the Sp(12,R)bandhead,are always Pauli allowed,but organized in a different way into different SO(6)*** is in contrast to the case of filling the levels of the standard three-dimensional harmonic oscillator and using the plethysm *** the SU_(pn)(3)multiplets withinυ<υ0 are not all Pauli forbidden,it is safe to discard *** results obtained in the present work are important for the practical application of the microscopic version of the Bohr-Mottelson collective model.

关键词： microscopic shell-model version of the Bohr-Mottelson model proton-neutron symplectic model Sp(12,R)dynamical algebra shell-model representations

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Harmonics in the Squirrel Cage Induction Motor Analytic Calculation Part III: Influence on the Torque-speed Characteristic

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CES Transactions on Electrical Machines and Systems 2024年第1期8卷 86-102页

作者： g.Kovács the ganz Electric Works BudapestHungary

The harmonics that appear in the squirrel cage asynchronous machine have been discussed in great detail in the literature for a long time. However, the systematization of the phenomenon is still pending, so we made an attempt to fill this gap in the previous parts of our study by elaborating formulas for calculation of parasitic torques. It was a general demand among those who work in this field towards the author to verify his formulas with measurements. In the literature, it seems,only one detailed, purposeful series of measurements has been published so far, the purpose of which was to investigate the effect of the number of rotor slots on the torque-speed characteristic curve of the machine. The main goal of this study is to verify the correctness of the formulas by comparing them with the referred series of measurements. Relying on this, the expected synchronous parasitic torques were developed for the frequently used rotor slot numbers-as a design guide for the ***, together with our complete table for radial magnetic pull published in our previous work, the designer has all the principles, data and formulas available for the right number of rotor slots for his given machine and for the drive system. This brings this series of papers to an end.

关键词： Asynchronous parasitic torques Induction motor Squirrel cage rotor Space harmonics Synchronous parasitic torques

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