Rajput S.,Jawaharlal Nehru University |
Singh L.P.,Central Building Research Institute |
Pittman C.U.,Mississippi State University |
Mohan D.,Jawaharlal Nehru University
Journal of Colloid and Interface Science | Year: 2017
Superparamagnetic maghemite (γ-Fe2O3) nanoparticles of controllable morphology were successfully synthesized using a flame spray pyrolysis (FSP) technique. Their physico-chemical properties, size, morphology, and surface chemistries were determined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), selected area electron diffraction patterns (SAED), SEM-EDX, scanning electron microscopy (SEM), and pHZPC(6.3). Elemental contents before and after adsorption were identified using energy dispersive X-ray fluorescence (ED-XRF), energy dispersive X-ray analysis (EDX) and elemental mapping. Surface area (SBET 79.35 m2/g) and size distribution analyses were conducted using a surface area analyzer and dynamic light scattering (DLS), respectively. The magnetic moment (44.5 at 300 K and 50.16 at 2 K) was determined using a physical properties measurement system (PPMS). The first adsorption study using γ-Fe2O3 nanoparticles synthesized by FSP to successfully remediate Pb2+ and Cu2+ from water is reported. Batch adsorption studies were carried out. An optimum pH of 5.0 was studied for Pb2+ and Cu2+ removal. Pb2+ and Cu2+ removal mechanisms by these maghemite nanoparticles were presented. The adsorption of Pb2+ and Cu2+ was highly pH-dependent. The metal ion uptake was mainly governed by electrostatic attractions. Sorption kinetic data followed the pseudo-second-order model. The Freundlich, Langmuir, Redlich–Peterson, Radke and Sips adsorption isotherm models were applied to interpret equilibrium data. The Freundlich and Langmuir isotherm equations best fit the respective equilibrium data for Pb2+ and Cu2+. The maximum Langmuir adsorption capacities of these maghemite nanoparticles were 68.9 mg/g at 45 °C for Pb2+ and 34.0 mg/g at 25 °C for Cu2+. Thus, these maghemite nanoparticles made by FSP were readily prepared, characterized and showed promise for remediating heavy metal ions from aqueous solutions. © 2016 Elsevier Inc.
News Article | May 6, 2017
MARICOPA, AZ, May 06, 2017-- Avinash Chandra Singhal is a celebrated Marquis Who's Who biographee. As in all Marquis Who's Who biographical volumes, individuals profiled are selected on the basis of current reference value. Factors such as position, noteworthy accomplishments, visibility, and prominence in a field are all taken into account during the selection process.Marquis Who's Who, the world's premier publisher of biographical profiles, is proud to name Dr. Singhal a Lifetime Achiever. An accomplished listee, Dr. Singhal celebrates many years' experience in his professional network, and has been noted for achievements, leadership qualities, and the credentials and successes he has accrued in his field.An esteemed and lauded figure in his field, Dr. Singhal most recently served as a professor at Arizona State University, a position he held for nearly 30 years. Other roles he held include Director of the Central Building Research Institute, Project Engineer at Weidlinger Associates, Inc., Manager of Technological Services for Engineers India Ltd., Manager of General Electric in Philadelphia, PA Assistant Program Manager of TRW Inc. in Redondo Beach, CA, Professor at Universite Laval, and Research Engineer at Kaman Corporation, Burlington, MA.Dr. Signhal conducted research in computer modeling, research in blast effects on structures, research in lifeline engineering, research in earthquake strengthening of deteriorated dams, and research in steel and concrete buildings, bridges, materials and non-linear finite element dynamics.Sr. Singhal contributed to the following works: "Dynamic Analysis of Dams with Nonlinear Slip Joints" (1998), "Performance of Retrofit Arch Dams" (1998), "Arizona Emergency Center Retrofit" (1998), "Simulation of Blast Pressures on Flexible Panels" (1994), "System Flexibility and Reflected Pressures" (1993) and "Wood Substitute: A National Priority, India."In addition to his status as a Lifetime Achiever, Dr. Singhal has previously received the First Prize in Bridge Building from the Institution of Structural Engineers, the Merit Award from the Institution of Engineers India, and the Henry Adams Research Medal from the Structural Engineers London.Moreover, Dr. Singhal has been recognized as a fellow of the Massachusetts Institute of Technology, American Society of Civil Engineers, Royal Astronomical Society and Kobe University, as well as a Dennison Scholar of The Institution of Civil Engineers. Furthermore, Dr. Singhal has received grants from the Department of Emergency and Military Affairs, the Office of Naval Research, the United States Department of the Interior, the U.S. Army Corps of Engineers, and the National Science Foundation. Dr. Singhal has also been a featured listee in Who's Who in Finance and Business, Who's Who in Finance and Industry, Who's Who in America, Who's Who in Science and Engineering, Who's Who in the West and Who's Who in the World.About Marquis Who's Who :Since 1899, when A. N. Marquis printed the First Edition of Who's Who in America , Marquis Who's Who has chronicled the lives of the most accomplished individuals and innovators from every significant field of endeavor, including politics, business, medicine, law, education, art, religion and entertainment. Today, Who's Who in America remains an essential biographical source for thousands of researchers, journalists, librarians and executive search firms around the world. Marquis publications may be visited at the official Marquis Who's Who website at www.marquiswhoswho.com
Gupta V.K.,Indian Institute of Technology Roorkee |
Sethi B.,P.A. College |
Upadhyay N.,Lovely Professional University |
Kumar S.,P.A. College |
And 2 more authors.
International Journal of Electrochemical Science | Year: 2011
The construction, performance characteristics and application of a novel iron(III) membrane sensor based on a new S-methyl N-(methylcarbamoyloxy) thioacetimidate are reported in this paper. The designed sensor exhibited a wide linear response with a slope of 21.2 mV per decade over the concentration range of 9.1x10-6-1.0x10-1 M. The potentiometric response is independent on the pH of the solution in the range of 3.2-4.8. The electrode shows a response time of 20 s. The proposed electrode can be used for at least two months without any considerable divergence in potentials. It exhibits very good selectivity relative to a wide variety of alkali, alkaline earth, transition and heavy metal ions. The developed sensor was used for the quantitative determination of Fe(III) in tap and mineral water samples. The electrode assembly was also used as an indicator electrode in the potentiometric titration of Fe3+ with EDTA. © 2011 by ESG.
Sethi B.,P.A. College |
Chandra S.,Indian Institute of Technology Bombay |
Kumar S.,P.A. College |
Singh R.,Dbs Degree College |
Singh L.P.,Central Building Research Institute
Journal of Electroanalytical Chemistry | Year: 2011
Poly(vinyl chloride) (PVC)-based membranes of silacrown end grafted carbosilane dendrimer (I) with sodium tetraphenylborate (NaTPB) as an anion inhibitor and dibutylphthalate (DBP), dioctylphthalate (DOP), dibutyl (butyl) phosphonate (DBBP) and 1-chloronaphthalene (CN) as plasticizing solvent mediators were prepared and used as Na+-selective electrodes. Optimum performance was observed with the membrane having I-PVC-NaTPB-DOP in the ratio 1:33:1:65 (w/w). The electrode works well over a wide concentration range 1.5 × 10-6-1.0 × 10-1 M with Nernstian compliance 56.0 mV/decade between pH 5.8 and 9.2 with a fast response time of about 15 s. The selectivity relative to alkali, alkaline earth and transition heavy metal ions is good. The selectivity coefficient values towards potassium ions have been calculated to be 2.3 × 10-4 by utilizing Fixed Interference Method. The proposed electrode could be used for at least 2 months without considerable alteration in its potential. The effect of nonionic surfactants Tween 20, Tween 80, Triton X 100, Span 20 and Span 60 on the potentiometric properties of the sodium selective membrane was also studied. © 2010 Elsevier B.V. All rights reserved.
Gupta R.,Uttarakhand Technical University |
Yadav P.K.,Central Building Research Institute
Advances in Intelligent Systems and Computing | Year: 2016
All practical real-time scheduling algorithm in distributed processing environment present a trade-off between their computational intricacy and performance. In real-time system, tasks have to perform correctly and timely. Finding minimal schedule in distributed processing system with constrains is shown to be NP- Hard. Systematic allocation of task in distributed real-time system is one of the major important parameter to evaluate the performance if this step is not execute properly the throughput of the system may be decrease. In this paper, a fuzzy clustering-based algorithm has been discussed. © Springer Science+Business Media Singapore 2016.
Panda K.C.,ITER |
Bhattacharyya S.K.,Central Building Research Institute |
Barai S.V.,Indian Institute of Technology Kharagpur
Construction and Building Materials | Year: 2013
The focus of the present paper is on the study of the effect of transverse steel on the performance against shear and modes of failure of simply supported reinforced concrete (RC) T-beams strengthened in shear zone with glass fiber reinforced polymer (GFRP) sheet. Eighteen RC T-beams of 2.5 m span with and without transverse steel reinforcement are cast at the structural laboratory of IIT Kharagpur. Nine beams are used as control beam specimens in three different stirrups spacing such as without stirrups and with stirrups at 200 mm and 300 mm spacing and rest nine beams are strengthened in shear zone with GFRP sheet in U-jacket, side bonded and U-jacket with anchorage in each type of stirrups spacing. All the beams are tested in 300 Ton Universal Testing Machine (UTM). The test result clearly demonstrates the GFRP sheet in U-jacket with anchorage is much more effective than the U-jacket scheme. © 2012 Published by Elsevier Ltd. All rights reserved.
Ghosh S.,National Institute of Technology Agartala |
Saran S.K.,Central Building Research Institute
Electronic Journal of Geotechnical Engineering | Year: 2010
In this paper an attempt is being made to get the dynamic active earth pressure considering cohesion, adhesion, surcharge and weight components together. For this, Culmann's graphical construction has been modified. © 2010 ejge.
Bhatnagar A.,Central Building Research Institute |
Bhatnagar A.,Mikkeli University of Applied Sciences |
Minocha A.K.,Central Building Research Institute |
Sillanpaa M.,Mikkeli University of Applied Sciences
Biochemical Engineering Journal | Year: 2010
The present study was undertaken to evaluate the feasibility of lemon peel waste for the removal of cobalt ions from aqueous solutions. Batch experiments were performed to study the adsorption of cobalt on lemon peel adsorbent. The maximum adsorption capacity of lemon peel adsorbent for cobalt removal was ca. 22 mg g-1. Three simplified kinetic models viz. pseudo-first-order, pseudo-second-order, and Weber and Morris intraparticle diffusion models were tested to describe the adsorption process. Kinetic parameters, rate constants, equilibrium sorption capacities, and related correlation coefficients for kinetic models were determined. It was found that the present system of cobalt adsorption on lemon peel adsorbent could be described more favorably by the pseudo-second-order kinetic model. The adsorption process has been found to be exothermic. The results of the present study suggest that lemon peel waste can be used beneficially in treating industrial effluents containing heavy metal ions. © 2009 Elsevier B.V. All rights reserved.
Singh M.,Central Building Research Institute
Indian Concrete Journal | Year: 2013
The characterization of ground granulated blast furnace slag, fluorogypsum anhydrite and cement clinker used for formulating the super-sulphated cement (SSC) is discussed. It shows that about 65 to 75 % of granulated slag can be blended with 20% of anhydrite and 10 to 15% cement clinker to form super-sulphated cement. The strength development in the super-sulphated cement is attributed to the formation of ettringite, CSH and dicalcium hydrate. The initial strength development in SSC is due to the formation of tricalcium sulphoaluminate and C-S-H whereas the later age strength is attributed to the formation of calcium silicate hydrate (C-S-H ). The power consumption for grinding slag is considerably higher than that for cement clinker. Additional power is also required in various operations such as winning, crushing, grinding of raw materials and running of rotary kiln in the manufacture of cement clinker. The heat of hydration determined at 7 and 28 days of SSC comply with the requirements specified by the Indian standard specification IS 6909.
Thapliyal P.C.,Central Building Research Institute
Composite Interfaces | Year: 2010
Interpenetrating polymer networks (IPNs) are a new class of polymer blends in network form in which at least one component is polymerized and/or cross-linked in the immediate presence of the other. IPNs possess several interesting characteristics in comparison to normal polyblends, because the varied synthetic techniques yield IPNs of such diverse properties that their engineering potential spans a broad gamut of modern technology. Interpenetrating polymer networks have shown excellent chemical resistance, hardness, elongation, tensile strength properties and higher compatibility. Hence, it can be concluded that using the IPN concept, it is possible to design the most desirable material for a specific end use requirement. © 2010 Koninklijke Brill NV, Leiden.