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Evolution of stellated gold nanoparticles:New conceptual insights into controlling the surface processes

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Nano research 2022年第2期15卷 1260-1268页

作者： Gurvinder singh Hesamodin Jami Pooria Lesani Shubhayan b.hattacharya Yogambha ramaswamy Prem bbisht Hala Zreiqat ArC Centre for Innovative bioEngineering Tissue Engineering and Biomaterials Research UnitSydney Nano Institute and the School oj Biomedical EngineeringThe University of SydneyNSW 2008Australia Department of Physics Indian Institute of Technology MadrasChennaiIndia

Understanding the surface processes(deposition and surface diffusion)that occur at or close to the surface of growing nanoparticles is important for fabricating reproducibly stellated or.branched gold nanoparticles with precise control over arm length and spatial orientation of arms around the *** employing a simple seed-mediated strategy,we investigate the key synthetic variables for precise tuning of in situ surface processes(competition between the deposition and surface diffusion).These variables include the reduction rate of a reaction,the packing density of molecules/ions on the high surface energy facets,and *** a result,the thermodynamically stabilized nanoparticles(cuboctahedron and truncated cube)and kinetic products(cube,concave cube,octapod,stellated octahedron,and rhombic dodecahedron)in different sizes with high quantitative shape yield(>80%)can be obtained depending on the reduction rate of reaction and the packing density of molecules/*** computer simulation,we studied the stability of stellated(branched structure)and non-stellated(non-branched structure)gold nanoparticles at high *** construct a morphology phase diagram by varying different synthetic parameters,illustrating the formation of both stellated and non-stellated gold nanoparticles in a range of reaction *** stellated gold nanoparticles display shape-dependent optical properties and can be self-assembled into highly ordered superstructures to achieve an enhanced plasmonic *** strategy can be applied to other metal systems,allowing for the rational design of advanced new stellated metal nanoparticles with fascinating symmetry dependent plasmonic,catalytic,and electronic properties for technological applications.

关键词： surface diffusion shape control stellated nanoparticles self-assembly nanoplasmonics octapod stellated octahedron

Spatio-temporal evaluation of Zr plasma parameters in a single-beam-splitting double-pulse laser-induced plasma

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Plasma Science and Technology 2021年第2期23卷 47-56页

作者： Arnab SArKAr Manjeet singh Fuel Chemistry Division Bhabha Atomic Research CentreMumbai 400085India Homi bhabha National Institute AnushaktinagarMumbai 400094India

The plasma shielding effect is one of the major weaknesses of laser-induced breakdown spectroscopy(LIbS)as it causes non-linearity in signal *** LIbS is typically carried out in constant laser energy,this non-linearity causes a reduction in *** this work,we systematically examine laser-induced plasma,formed by two different excitation source modes,*** pulse(SP)-excitation and single-beam-splitting double-pulse(SbS-DP)-excitation over Zr-2.5%Nb *** two most important plasma parameters influencing the emission line intensity,plasma temperature(Te)and electron density(Ne)were studied and compared for.both modes of laser *** of the results conclusively demonstrates that due to the splitting of the laser energy in the SbS-DP mode,the plasma shielding effect is significantly *** reduced plasma shielding translates to an increased laser–sample coupling under SbS-DP *** imaging of the total intensity of the laser-induced plasma in both excitation modes was also *** study shows how the plasma shielding effect can be reduced to improve the analytical quality of the LIbS methodology.

关键词： LIbS single-beam-splitting double pulse spatial-temporal evolution plasma temperature electron density

Development of mix design method based on statistical analysis of different factors for geopolymer concrete

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Frontiers of Structural and Civil Engineering 2022年第10期16卷 1315-1335页

作者： Paramveer singh Kanish KAPOOr Department of Civil Engineering Dr B R Ambedkar National Institute of TechnologyJalandhar 144011India

The present study proposes the mix design method of Fly Ash(FA)based geopolymer concrete using response Surface Methodology(rSM).In this method,different factors,including binder content,alkali/binder ratio,NS/NH ratio(sodium silicate/sodium hydroxide),NH molarity,and water/solids ratio were considered for the mix design of geopolymer *** 2D contour plots were used to setup the mix design method to achieve the target compressive *** proposed mix design method of geopolymer concrete is divided into three categories based on curing regime,specifically one ambient curing(25°C)and two heat curing(60 and 90°C).The proposed mix design method of geopolymer concrete was validated through experimentation of M30,M50,and M70 concrete mixes at all curing *** observed experimental compressive strength results validate the mix design method by more than 90%of their target ***,the current study concluded that the required compressive strength can be achieved by varying any factor in the mix *** addition,the factor analysis revealed that the NS/NH ratio significantly affects the compressive strength of geopolymer concrete.

关键词： geopolymer concrete mix design fly ash response surface methodology compressive strength stress—strain

Tr.bological behavior as lubricant additive and physiochemical characterization of Jatropha oil blends

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Friction 2015年第4期3卷 320-332页

作者： Yashvir singh Department of Mechanical Engineering College of Engineering StudiesUniversity of Petroleum and Energy StudiesDehradun 248007India

This investigation reports on the effect of Jatropha oil doped with lube oil on tr.bological characteristics of Al-7%Si *** factors involved were Jatropha oil percentages,sliding velocities and load which was optimized for weight loss,friction coefficient and specific wear rate *** conventional lubricant was SAE *** is observed that the Jatropha oil percentage factor had significant influence on the weight loss,friction coefficient and wear rate of the *** optimum result was A_(2) b_(3) C_(1) for pin weight loss,friction coefficient and wear *** the experimental result,it is found that the wear scar diameter increases with the increase of load for lube oil and reduced by addition of percentage of Jatropha *** temperature parameter was also studied in this experiment and results show that 15%addition of Jatropha oil would result in less possibility to film *** overall results of this experiment reveal that the addition of 15%Jatropha oil with base lubricant produces better performance and anti-wear *** blend can be used as lubricant oil which is environment friendly in nature and would help to reduce petroleum based lubricant substantially.

关键词： Taguchi ANOVA pin weight loss friction coefficient wear rate

Effect of using borax decahydrate as nanoparticles additive in blends of spirulina biodiesel/diesel on combustion characteristics and knock intensity

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Clean Energy 2024年第3期8卷 62-78页

作者： Ajay Partap singh Puneet singh Gautam Mechanical Engineering Department IIMT University Meerut250001 Uttar PradeshIndia

In this extensive investigation,the impact of borax decahydrate as a fuel additive in a diesel single-cylinder engine was rigorously *** decahydrate was introduced at concentrations of 5,15,25 and 35 g in 500 ml of biodiesel,forming five unique fuel mixtures with conventional diesel:90%diesel+10%spirulina biodiesel(Sb10),Sb10+1 g borax decahydrate(Sb10b1),Sb10+3 g borax decahydrate(Sb10b3),Sb10+5 g borax decahydrate(Sb10b5)and Sb10+7 g borax decahydrate(Sb10b7).The investigation encompassed four diverse loading conditions and yielded insightful ***,at full load,Sb10b3 exhibited a higher cylinder peak pressure than diesel,reaching 69.25 *** release rate profiles demonstrated superior efficiency for Sb10 at 50%load,with a cumulative heat release rate of 950 J/°CA,which is lower than the 1050 J/°CA of *** intensity(KI)evaluations revealed that,although Sb10 and Sb10b1 exhibited higher KI than diesel at full load due to elevated peak pressure,Sb10b7 showed no knocking across all loads,indicative of reduced in-cylinder *** meticulous numerical analysis emphasizes the potential of borax decahydrate as a catalyst and enhancer,providing valuable insights into the combustion dynamics of these alternative fuel blends and their viability for sustainable and efficient engine *** summary,out of all the blends,Sb10b3 could be a potential diesel fuel replacement fuel for compression-ignition engines.

关键词： spirulina biodiesel borax decahydrate diesel engine combustion knock intensity Hrr in-cylinder pressure

DECISION TOOLS FOr MULbErrY THrIPS PSEUDODENDrOTHrIPS MOrI （NIWA, 1908） MANAGEMENT IN SErICULTUrAL rEGIONS; AN OVErVIEW

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Entomologia Sinica 2004年第4期11卷 243-255页

作者： KayvanEtebari L.Matindoost r.N.singh DepartmentofSericulture CollegeofNaturalResourcesUniversityofGuilanSomeheSara1144Iran DepartmentofEntomology CollegeofAgricultureUniversityofGuilanRashtIran CentralSilkboard B.T.M.LayoutMadiwalaBangalore560068India

Mulberry thrips Pseudodendrothrips mori (Niwa, 1908) is a major pest of mulberry trees recorded from different sericultural regions of the world. The thrips infestation affects the qualitative and quantitative characters of mulberry leaf, by direct feeding damage to leaves and the ingestion of sap, which in turn affects the silkworm cocoon crop. This is most harmful in dry climates and seasons when heavily attacked plants lose moisture heavily. Under these conditions infestation can seriously deplete yields. The seasonal population fluctuation and the degree of damage caused to the host plant are influenced by various environmental factors including climate, host-plant variety, topography, soil type, and management *** article attempts to review all available documents on mulberry thrips and to discuss the practical approaches for.best control of this pest.

关键词：桑蓟马有害生物治理发生规律桑树害虫

refractive Index and Electronic Polarizability of Ternary Chalcopyrite Semiconductors

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Chinese Physics Letters 2015年第12期32卷 147-151页

作者： KUMAr V. SINHA Anita singh b.P. SINHA A.P. JHA V. Department of Electronics Engineering Indian School of Mines

Simple models are proposed for the calculation of refractive index n and electronic polarizability α of AⅠbⅢC2Ⅵ and AⅡbⅣC2Ⅴ compounds of groups of chalcopyrite semiconductors from their energy gap data. The values family and 12 compounds of AⅡbⅣC2Ⅴ family are calculated for the work. The proposed models are applicable for the whole range of energy gap materials. The calculated values are compared with the available experimental and reported values. A fairly good agreement between them is obtained.

关键词： Te In refractive Index and Electronic Polarizability of Ternary Chalcopyrite Semiconductors

A new four-dimensional hyperjerk system with stable equilibrium point, circuit implementation, and its synchronization by using an adaptive integrator.backstepping control

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Chinese Physics b 2018年第10期27卷 231-239页

作者： J P singh V T Pham T Hayat S Jafari F E Alsaadi b K roy Department of Electrical Engineering National Institute of Technology Silchar 788010 India School of Electronics and Telecommunications Hanoi University of Science and Technology 01 Dai Co Viet Hanoi Viet Nam Department of Mathematics Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia Department of Mathematics Quaid-I-Azam University Islamabad 44000 Pakistan Ambikar University of Technology Tehran 15875-4413Iran Department of Information Technology Faculty of Computing and IT King Abdulaziz University Jeddah Saudi Arabia

This paper reports a new simple four-dimensional（4 D） hyperjerk chaotic system. The proposed system has only one stable equilibrium point. Hence, its strange attractor.belongs to the category of hidden attractors. The proposed system exhibits various dynamical behaviors including chaotic, periodic, stable nature, and coexistence of various attractors. Numerous theoretical and numerical methods are used for the analyses of this system. The chaotic behavior of the new system is validated using circuit implementation. Further, the synchronization of the proposed systems is shown by designing an adaptive integrator.backstepping controller. Numerical simulation validates the synchronization strategy.

关键词： new hyperjerk chaotic system stable equilibrium hidden attractors adaptive backstepping control synchronization

The role and significance of Magnesium in modern day research-A review

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Journal of Magnesium and Alloys 2022年第1期10卷 1-65页

作者： S V Satya Prasad S b Prasad Kartikey Verma raghvendra Kumar Mishra Vikas Kumar Subhash singh Department of Production and Industrial Engineering National Institute of Technology JamshedpurJharkhand831014India Department of Chemical Engineering Indian Institute of TechnologyKanpur208016India Enhanced Composites and Structures Center School of AerospaceTransport and ManufacturingCranfield UniversityBedfordshire MK43 OALUK Department of Automotive Technology Mechanical Department DivisionFederal TVET instituteAddis AbabaEthiopia

Magnesium is one of the largely available elements in the earth’s crust. It has a low structural density with high specific strength. This unique material property has forced an increase in the use of magnesium and its alloys in various applications pertaining to industrial sector,automobiles, aerospace and biomedical. Since magnesium is a highly reactive metal, it is prone to higher rate of corrosion as compared to its counterparts. Thus, it is essential to analyze the corrosion behavior of magnesium and its alloys in its applications. An appropriate process is to be followed in the design and development of magnesium alloys which overcome the limitations of magnesium and enhance the desired material properties in accordance to their applications. This review paper summarizes the importance of magnesium and its material properties. The influence of various alloying elements on the mechanical properties of magnesium is reviewed. The broad classification of Mg alloys and their.behavioral trends are detailed. The corrosion behavior of magnesium and the influence of corrosion products on the material characteristics of magnesium, in aqueous medium, are discussed. The manufacturing techniques of magnesium alloys along with the secondary techniques are also covered. The various applications and the limitations of magnesium in these applications are covered. A complete section is dedicated towards detailing the recent trends of magnesium(Mg) alloys, i.e., the biodegradable nature and applications of Mg alloys. The influence of biocorrosion on Mg alloys and techniques to overcome it have been deliberated. This paper provides a thorough review on recent developments of magnesium with respect to engineering applications.

关键词： Magnesium alloys biodegradable alloys Magnesium corrosion biocorrosion