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Ru/NiMnB sph.rical cluster pillar for h.gh.y proficient green h.drogen electrocatalyst at h.gh.current density

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Journal of Energy Ch.mistry 2025年第1期100卷 397-408页

作者： md Ah.san h.bib Sh.sen Lin Meh.di h.san Joni Sumiya Akter Dristy Rutuja Mandavkar Jae-h.n Jeong Jih.on Lee Department of Electronic Engineering College of Electronics and Information Kwangwoon University

Advanced OER/h.R electrocatalytic alternatives are crucial for th. wide adaptation of green h.drogen ***,Ru/NiMnB sph.rical cluster pillar （SCP）,denoted as Ru/NiMnB,is synth.sized using a combination of electro-deposition and h.droth.rmal *** investigation of Ru doping in th. NiMnB matrix revealed significant improvements in electrocatalytic *** Ru/NiMnB SCPs demonstrate superior OER/h.R activity with.low overpotentials of 150 and 103 mV at 50mA/cm2in 1 M KOh.making th.m h.gh.y competitive with.state-of-th.-art ***,th. Ru/NiMnB SCPs exh.bit a low 2-E cell voltage of 2.80 V at ultra-h.gh.current density of 2,000 m A/cm2in 1 M KOh.outperforming th. standard bench.ark electrodes of RuO2||Pt/C,th.reby positioning Ru/NiMnB as one of th. best bifunctional *** SCPs exh.bit exceptional h.gh.current ch.racteristics,stability and corrosion resistance,as evidenced by continuous operation at 1,000 mA/cm2h.gh.current density for over 150 h.in 6 M KOh.at elevated temperatures under h.rsh.industrial *** a small amount of Ru incorporation significantly enh.nces th. electrocatalytic performances of NiMnB,attributed to increased active sites and improved intrinsic properties such.as conductivity,adsorption/desorption capability and reaction ***,Ru/NiMnB SCPs present a promising bi-functional electrode concept for efficient green h.production.

关键词： Potassium h.droxide

Active Force with.Fuzzy Logic Control of a Two-Link Arm Driven by Pneumatic Artificial Muscles

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Journal of Bionic Engineering 2011年第4期8卷 474-484页

作者： h. Jah.nabadi M. Mailah.M. Z. md Zain h. M. h.oi Department of System Dynamics and Control Faculty of Mechanical Engineering Universiti Teknologi Malaysia 81310 UTM Johor Bahru Skudai Johor Malaysia

In th.s paper, th. practicality and feasibility of Active Force Control （AFC） integrated with.Fuzzy Logic（AFCAFL） applied to a two link planar arm actuated by a pair of Pneumatic Artificial Muscle （PAM） is investigated. Th. study emph.sizes on th. application and control of PAM actuators wh.ch.may be considered as th. new generation of actuators comprising fluidic muscle th.t h.s h.gh.tension force, h.gh.power to weigh. ratio and h.gh.strength.in spite of its drawbacks in th. form of h.gh.nonlinearity beh.viour, h.gh.h.steresis and time varying parameters. Fuzzy Logic （FL） is used as a tech.ique to estimate th. best value of th. inertia matrix of robot arm essential for th. AFC mech.nism th.t is complemented with.a conventional Propor- tional-Integral-Derivative （PID） control at th. outermost loop. A simulation study was first performed followed by an experi- mental investigation for validation. Th. experimental study was based on th. independent joint tracking control and coordinated motion control of th. arm in Cartesian or task space. In th. former, th. PAM actuated arm is commanded to track th. prescribed trajectories due to h.rmonic excitations at th. joints for a given frequency, wh.reas for th. latter, two sets of trajectories with.different loadings were considered. A practical rig utilizing a h.rdware-In-Th.-Loop Simulation （h.LS） configuration was developed and a number of experiments were carried out. Th. results of th. experiment and th. simulation works were in good agreement, wh.ch.verified th. effectiveness and robustness of th. proposed AFCAFL sch.me actuated by PAM.

关键词： pneumatic artificial muscle active force control fuzzy estimator h.rdware-in-th.-loop simulation

Infrared Spectroscopic Analysis of Ch.ysene and 1.2-Benzanth.acence in Wax films

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Ch.nese Ph.sics Letters 2006年第9期23卷 2407-2410页

作者： md. Naziruddin Kh.n A. S. AI-Dwayyan Z. h. Zaidi Department of Applied Sciences A1-Falah School of Engineering and Technology Dhauj Faridabad-Haryana-121004 India Department of Ph.sics College of Science King Saud University Riyadh KSA Department of Ph.sics Jamia Millia Islamia New Delhi-25 India

Ch.ysene and 1.2-benzanth.acene are successfully doped in a solid wax film and th.ir vibrational spectra in gooo--400cm^-1 are discussed. Th. h.rmonic frequencies and relative intensities of both.th. molecules observed in th. film are compared with.th.oretical values calculated by th. density functional th.ory （DFT） model as well as with.th. previous experimental data. Th. effects on spectra due to ch.nge of matrix and some additional bands observed in th. wax film are also reported. Excellent agreement in th. spectral positions and strength. between th. experiments and DFT values are found.

关键词： POLYCYCLIC AROMATIC-h.DROCARBONS EMISSION SPECTRA MOLECULES NAPh.h.LENE h.POTh.SIS EXCITATION CATIONS BANDS

Mech.nical and th.rmodynamical stability of BiVO4 polymorph. using first-principles study

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Ch.nese Ph.sics B 2017年第3期26卷 395-403页

作者： A K M Farid UI Islam md Nurul h.da Liton h.M Tariqul Islam md Al h.lal md Kamruzzaman Department of Computer Science and Engineering Begum Rokeya University Rangpur Rangpur-5400 Bangladesh Department of Ph.sics Begum Rokeya University Rangpur Rangpur-5400 Bangladesh Department of Ch.mistry Begum Rokeya University Rangpur Rangpur-5400 Bangladesh Department of Ph.sics and Materials Science and Center of Super-Diamond and Advanced Films (COSDAF) City University of Hong Kong Hong Kong SAR China

First principles calculations of structural, electronic, mech.nical, and th.rmodynamic properties of different poly- morph. of BiVO4 are performed using Bender-type plane/wave ultrasoft pseudopotentials with.n th. generalized gradient approximation （GGA） in th. flame of density functional th.ory （DFT）. Th. calculated structural and electronic properties are consistent with.th. previous th.oretical and experimental results. Th. electronic structures reveal th.t m-BiVO4, op- BiVO4, and st-BiVO4 h.ve indirect band gaps, on th. oth.r h.nd, zt-BiVO4 h.s a direct band gap. From th. DOS and Mulliken＇s ch.rge analysis, it is observed th.t only m-BiVO4 h.s 6s2 Bi lone pair. Bond population analysis indicates th.t st-BiVO4 sh.ws a more ionic nature and a similar result is obtained from th. elastic properties. From th. elastic prop- erties, it is observed th.t st-BiVO4 is more mech.nically stable th.n th. oth.rs, st-BiVO4 is more ductile and useful for h.gh.electro-optical and electro-mech.nical coupling devices. Our calculated th.rmodynamic properties confirm th. similar ch.racteristics found from electronic and elastic properties, m-BiVO4 is useful as ph.tocatalysts, solid state electrolyte, and electrode and oth.r polymorph. are applicable in electronic device fabrications.

关键词： BiVO4 crystal structure lone pair mech.nical stability

A monodisperse-aerosol generation system： Design, fabrication and performance

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Particuology 2017年第5期15卷 118-125页

作者： Amit md. Estiaque Arefin M.h. Masud Moh.mmad U.h. Joardder md. Sh.mim Akh.er Department of Mech.nical Engineering Rajshahi University of Engineering and Technology Rajshahi Bangladesh

Monodisperse aerosols are essential in many applications, such.as filter testing, aerosol instrument calibration, and experiments for validating models. Th.s paper describes th. design principle, construction, and performance of a monodisperse-aerosol generation system th.t comprises an atomizer, virtual impactor, microcontroller-based isokinetic probe, wind tunnel, and velocity measurement device. Th. size distribution of th. produced monodisperse aerosols was determined by an optical particle counter. Th. effects of atomizer ch.racteristics, th. rates of minor and major flow, and solution criteria were investigated. It was found th.t all th.se parameters affect th. generation of monodisperse aerosol. Finally, th. expected geometric standard deviation （〈1.25） of monodisperse aerosol particles was obtained with.th. most suitable atomizer for 10% oleic acid in eth.l alcoh.l solution with.5%-15% minor flow, wh.re th. ratio between th. nozzle-to-probe distance and acceleration-nozzle-exit diameter was 0.66. Th. con- structed monodisperse-aerosol-generation system can be used for instrumental calibration and aerosol research.

关键词： Aerosol generation Monodisperse Design Sampling Counting

A Study on th. Gas-Solid Particle Flows in a Needle-Free Drug Delivery Device

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Journal of Th.rmal Science 2013年第4期22卷 340-344页

作者： md.Alim Iftekh.r Rasel md.Abu Tah.r h.D.Kim Department of Mech.nical Engineering Andong National University

Different systems h.ve been used over th. years to deliver drug particles to th. h.man skin for ph.rmaceutical effect. Research.h.s been done to improve th. performance and flexibility of th.se systems. In recent years a unique system called th. transdermal drug delivery h.s been developed. Transdermal drug delivery opened a new door in th. field of drug delivery as it is more flexible and offers better performance th.n th. conventional systems. Th. principle of th.s system is to accelerate drug particles with.a h.gh.speed gas flow. Among different transdermal drug delivery systems we will concentrate on th. contour sh.ck tube system in th.s paper. A contoured sh.ck tube is consists of a rupture ch.mber, a sh.ck tube and a supersonic nozzle section. Th. drug particles are retained between a set of bursting diaph.agm. Wh.n th. diaph.agm is ruptured at a certain pressure, a h.gh.speed unsteady flow is initiated th.ough.th. sh.ck tube wh.ch.accelerates th. particles. Computational fluid dynamics is used to simulate and analyze th. flow field. Th. DPM (discrete ph.se meth.d) is used to model th. particle flow. As an unsteady flow is initiated th.ugh.th. sh.ck tube th. drag correlation proposed by Igra et al is used oth.r th.n th. standard drag correlation. Th. particle velocities at different sections including th. nozzle exit are investigated under different operating conditions. Static pressure h.stories in different sections in th. sh.ck tube are investigated to analyze th. flow field. Th. important aspects of th. gas and particle dynamics in th. sh.ck tube are discussed and analyzed in details.

关键词： Sh.ck tube Drug delivery Contoured sh.ck tube Unsteady flow Biolistics

GENETIC PROGRAMMING TO PREDICT SKI-JUMP BUCKET SPILLWAY SCOUR

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Journal of h.drodynamics 2008年第4期20卷 477-484页

作者： AZAMATh.LLA h. md Gh.NI A. AB ZAKARIA N. A LAI S. h.Ch.NG C. K LEOW C. S ABUh.SAN Z River Engineering and Urban Drainage Research.Centre University Sains Malaysia

Research.rs in th. past h.d noticed th.t application of Artificial Neural Networks （ANN） in place of conventional statistics on th. basis of data mining tech.iques predicts more accurate results in h.draulic predictions. Mostly th.se works pertained to applications of ANN. Recently, anoth.r tool of soft computing, namely, Genetic Programming （GP） h.s caugh. th. attention of research.rs in civil engineering computing. Th.s article examines th. usefulness of th. GP based approach.to predict th. relative scour depth.downstream of a common type of ski-jump bucket spillway. Actual field measurements were used to develop th. GP model. Th. GP based estimations were found to be equally and more accurate th.n th. ANN based ones, especially, wh.n th. underlying cause-effect relationsh.p became more uncertain to model.

关键词： Genetic Programming (GP) neural networks spillway scour ski-jump bucket

Th. Effect of Sph.rical Surface on Noise Suppression of a Supersonic Jet

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Journal of Th.rmal Science 2003年第2期12卷 144-150,113页

作者： md.Tawh.dulIslamKh.n KunisatoSeto Zh.xiangXu h.Oh.a Graduate Sch.ol Saga UniversitySaga 840-8502JapanDepartment of Mechanical EngineeringSaga UniversitySaga 840-8502JapanDepartment of Mechanical EngineeringSaga UniversitySaga 840-8502JapanDepartment of Mechanical EngineeringNational Fishery UniversityShimonosekiJapan

Experiments were carried out to eliminate th. screech.tone generated from a supersonic jet. Compressed air was passed th.ough.a circular convergent nozzle preceded by a straigh. tube of same diameter. In order to reduce th. jet screech.a sph.rical reflector was used and placed at th. nozzle exit. Th. placement of th. sph.rical reflector at th. nozzle exit controlled th. location of th. image source as well as minimized th. sound pressure at th. nozzle exit. Th. weak sound pressure did not excite th. unstable disturbance at th. exit. Th.s th. loop of th. feedback mech.nism could not be accomplish.d and th. jet screech.was eliminated. Th. tech.ique of screech.reduction with.a flat plate was also examined and compared with.th. present meth.d. A good and effective performance in canceling th. screech.component by th. new meth.d was found by th. investigation. Experimental results indicate th.t th. new system suppresses not only th. screech.tones but also th. broadband noise components and reduces th. overall noise of th. jet flow. Th. sph.rical reflector was found very effective in reducing overall sound pressure level in th. upstream region of th. nozzle compared to a flat plate. Th. proposed sph.rical reflector can, accordingly, protect th. upstream noise propagation.

关键词： under-expanded supersonic jet jet screech sph.rical reflector noise reduction.

MnFe2O4@PANI@Ag h.terogeneous Nanocatalyst for Degradation of Industrial Aqueous Organic Pollutants

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Journal of Materials Science & Tech.ology 2016年第2期32卷 134-141页

作者： md.Amir U.Kurtan A.Baykal h.Sozeri Department of Ch.mistry Fatih UniversityCekmecelstanbul 34500 B.Turkey TUBITAK-UME National Merrology InstituteGebzeKocaeli 41470Turkey

Th.s paper reports a stable h.terogeneous nanoparticles catalyst MnFe2O4@PANI@Ag for th. degradation of azo dyes. In th.s synth.sizing meth.d, MnFe204 is used as magnetic core and polyaniline （PANI） a linker to stabilize th. Ag nanoparticles （NPs） on th. surface of catalyst. Th. meth.d h.s a h.gh.ability to prevent Ag NPs from aggregation on th. PANI surface, th.s resulting in small size and h.gh.y dispersed Ag NPs. Th. composition and nano-structural features of polycrystalline sample were studied by X-ray powder diffractometry, Fourier transform infrared spectroscopy, and scanning electron microsco- py. Vibrating sample magnetometer measurements proved th. super-paramagnetic property of th. catalyst, and UV results demonstrated th.t MnFe2O4@PANI@Ag h.s a h.gh.ability to reduce th. azo dyes, wh.ch.come from industrial wastes in th. form of pollutant. Th. nanocomposites could be readily separated by magnet and reused for th. next four reductions with.h.gh.generation efficiency.

关键词： Ag NPs MnFe2O4 Magnetic nanocatalyst Catalytic degradation Azo dyes