Kumar, Rakesh, Tomy, C. V., Paulose, P. L., Nagarajan, R., Malik, S. K.
Anomalous magnetic and transport properties observed in the La0.8-xEuxSr0.2MnO3 (0.04 l.e x l.e. 0.36) compounds are presented in this paper. The Curie temperature (TC) decreases from 260 K for x =...
Kumar, Rakesh, Tomy, C. V., Nagarajan, R., Paulose, P. L., Malik, S. K.
Here we report the magnetic and heat capacity studies of the double perovskite com-pounds Ba2SmRuO6 and Ba2DyRuO6. Antiferromagnetic transitions are inferred at 54 K and 47 K in Ba2SmRuO6 and...
Wearable Real-Time Stereo Vision for the Visually Impaired (2007)
G. Balakrishnan, G. Sainarayanan, R. Nagarajan, Sazali Yaacob
Mavani, K. R., Rana, D. S., Rayaprol, S., Parmar, R. N., Kuberkar, D. G., Kumar, Ravi, ...
We have deposited c-axis oriented thin films of La1.5Dy0.5CaBa2Cu5Oz (La-2125) tetragonal superconductor on LaAlO3 (001) by Pulsed Laser Deposition. These films were irradiated with 200 MeV Ag+15...
R. Nagarajan, A. Gupta, R. Mehrotra, M. M. Bajaj
Mid-infrared (MIR) spectroscopy in attenuated total reflectance (ATR) mode was used for quantifying ethanol, sucrose, and tartaric acid in alcoholic beverages. One hundred synthetic samples were...
Direct Determination of Moisture in Powder Milk Using Near Infrared Spectroscopy (2006)
R. Nagarajan, Parul Singh, Ranjana Mehrotra
Moisture content in commercially available milk powder was investigated using near infrared (NIR) diffuse reflectance spectroscopy with an Indian low-cost dispersive NIR spectrophotometer. Different...
Gaitonde, D., Sarkar, A., Kaisary, S., DeSilva, C., Dias, C.F.M., ...
The measurement of acetylcholinesterase (AChE) activity is used worldwide as a biomarker of environmental contamination due to neurotoxic substances. In the present study the AChE activities was...
Magnetic Properties of Ternary Gallides of type RNi4Ga (R = Rare earths) (2005)
Joshi, Devang A., Nagarajan, R., Malik, S. K.
The magnetic properties of RNi4Ga (R = La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm and Lu) compounds have been investigated. These compounds form in a hexagonal CaCu5 type structure with a space group...
Bhowmik, R. N., Ranganathan, R., Nagarajan, R.
We report magnetic behaviour of MnCr$_2$O$_4$, which belongs to a special class of spinel, known as chromite. Bulk MnCr$_2$O$_4$ shows a sequence of magnetic states, which follows paramagnetic (PM)...
Magnetic and Transport Properties of Ternary Indides of type R2CoIn8 (R = Ce, Pr and Dy) (2005)
Joshi, Devang A., Tomy, C. V., Paulose, P. L., Nagarajan, R., Nirmala, R., Malik, S. K.
We have synthesized and investigated the magnetic and transport properties of a series of compounds, R2CoIn8 (R = rare earth). Compounds form in single phase with a tetragonal structure (space group...
S.K. Natarajan, M. Ganapathy, R. Nagarajan, S. Somasundaram
A field experiment was conducted in the saline field of Annamalai University, experimental farm, Annamalai Nagar during Kharif season of 2000-2001, to study the screening of rice accessions for...
S. Krishnakumar, R. Nagarajan, S.K. Natarajan, D. Jawahar, B.J. Pandian
To optimize the NPK fertilizers requirements with hybrid rice (CORH 2) and graded levels of NPK during (Pishanam) wet season (September 2000 to January 2001), a field experiment was conducted in...
Fuzzy-Rule-Based Object Identification Methodology for NAVI System (2005)
R. Nagarajan, G. Sainarayanan, Sazali Yaacob, Rosalyn R. Porle
We present an object identification methodology applied in a navigation assistance for visually impaired (NAVI) system. The NAVI has a single board processing system (SBPS), a digital video camera...
Static magnetic response of clusters in Co_{0.2}Zn_{0.8}Fe_{1.95}Ho_{0.05}O_{4} spinel oxide (2003)
Bhowmik, R. N., Ranganathan, R., Nagarajan, R.
Earlier investigation of Co_{0.2}Zn_{0.8}Fe_{1.95}Ho_{0.05}O_{4} spinel has shown the existence of "super-ferromagnetic " clusters containing Fe^{3+} and Ho^{3+} ions along with small size clusters...
Janaki, J., Kumary, T. Geetha, Nagarajan, R., Mary, T. A., Valsakumar, M. C., Sastry, V. S., ...
In order to explore the possibility of tuning superconducting and ferromagnetic transitions by Cu doping (for Ru) in GdSr2RuCu2O8, we have carried out synthesis and characterization of...
Particle size effects in the antiferromagnetic spinel CoRh$_2$O$_4$ (2002)
Bhowmik, R. N., Nagarajan, R., Ranganathan, R.
We report the particle size dependent magnetic behaviour in the antiferromagnetic spinel CoRh2O4. The nanoparticles were obtained by mechanical milling of bulk material, prepared under sintering...
Antiferromagnetic transition in CePd2B2C and possible heavy- fermion behaviour in CePt2B2C (2002)
Hossain,Z., Geibel,C., Gupta,L. C., Nagarajan,R., Godart,C.
Our measurements of the magnetic susceptibility, resistivity and specific heat of CePd2B2C, a quaternary borocarbide, show clearly that Ce is in a stable trivalent state in this compound and orders...
Magnetic enhancement of Co$_{0.2}$Zn$_{0.8}$Fe$_2$O$_4$ spinel oxide by mechanical milling (2002)
Bhowmik, R. N., Ranganathan, R., Sarkar, S., Bansal, C., Nagarajan, R.
We report the magnetic properties of mechanically milled Co$_{0.2}$Zn$_{0.8}$Fe$_2$O$_4$ spinel oxide. After 24 hours milling of the bulk sample, the XRD spectra show nanostructure with average...
Antiferromagnetic transition in CePd2B2C and possible heavy- fermion behaviour in CePt2B2C (2002)
Hossain, Z., Geibel, C., Gupta, L. C., Nagarajan, R., Godart, C.
Our measurements of the magnetic susceptibility, resistivity and specific heat of CePd2B2C, a quaternary borocarbide, show clearly that Ce is in a stable trivalent state in this compound and orders...
TREC-8 Experiments at SUNY at Buffalo (2000)
B. Han, R. Nagarajan, R. Srihari, M. Srikanth
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Magnetoresistance in ordered and disordered double perovskite oxide, $Sr_2FeMoO_6$ (2000)
Sarma, DD, Sampathkumaran, EV, Ray, Sugata, Nagarajan, R, Majumdar, Subham, Kumar, Ashwani, ...
We have prepared crystallographically ordered and disordered specimens of the double perovskite, $Sr_2FeMoO_6$, and investigated their magnetoresistance (MR) behaviour. The extent of ordering between...
Magnetoresistance in ordered and disordered double perovskite oxide, Sr$_2$FeMoO$_6$ (2000)
Sarma, D. D., Sampathkumaran, E. V., Ray, Sugata, Nagarajan, R., Majumdar, Subham, Kumar, Ashwani, ...
We have prepared crystallographically ordered and disorder specimens of the double perovskite, Sr$_2$FeMoO$_6$ and investigated their magnetoresistance behaviour. The extent of ordering between the...
Magnetoresistance in ordered and disordered double perovskite oxide, $Sr_2FeMoO_6$ (2000)
Sarma, DD, Sampathkumaran, EV, Ray, Sugata, Nagarajan, R, Majumdar, Subham, Kumar, Ashwani, ...
We have prepared crystallographically ordered and disordered specimens of the double perovskite, $Sr_2FeMoO_6$, and investigated their magnetoresistance (MR) behaviour. The extent of ordering between...
Optic disc size in ocular hypertension (1999)
Chandra, SG, Nagarajan, R, Naduvilath, TJ, Dandona, L, Rao, VD
A Specification Structure for Deadlock-Freedom of Synchronous Processes (1999)
S. Abramsky, S. J. Gay, R. Nagarajan
Many different notions of "program property", and many different methods of verifying such properties, arise naturally in programming. We present a general framework of Specification Structures for...
Nature of the spin state in TmNi2B2C (1999)
Nagarajan, R, Alleno, E, Blundell, S J, Mazumdar, C, Cooke, D W, Cottrell, S P, ...
Nature of the spin state in TmNi2B2C (1999)
Nagarajan, R, Alleno, E, Blundell, SJ, Mazumdar, C, Cooke, DW, Cottrell, SP, ...
High Temperature Hot Corrosion Control by Fuel Additives (Contaminated Fuels). (1998)
Rathnamma,Dasara V., Nagarajan,R.
The potential of fuel additives to minimize corrosion of blade-material has been analyzed by the following series of steps: first, a computer program was employed for an equilibrium-thermodynamic...
Hoyle, Charles E., Creed, D., Nagarajan, R., Subramanian, P., Anzures, Edgardo T.
Based on analysis of the photochemistry of a model compound, N-phenylphthalimide, the photolysis of polyimide derived from 4,'-oxydianiline (ODA) and a diarylanhydride with a hexafluorinated...
Ultraviolet Stability of Polymers Containing the Hexafluoroisopropylidene Group. (1998)
Hoyle, C. E., Nagarajan, R., Anzures, E. T., Cassidy, P. E., Kane, K. M.
The photodecomposition of four polymer series containing the hexafluoroisopropylidene (6F moiety was studied. We report herein the photostability of a poly(ether ketone) series when subjected to UV...
Hoyle, C. E., Creed, D., Subramanian, P., Nagarajan, R., Pandey, C.
The photophysics of polyimides and several N-arylphthalimide model compounds has been investigated as part of an effort to understand the factors that control the oxidative photodegradation of these...
Rathnamma, Dasara V., Nagarajan, R.
Molten salts condensing on marine turbine blades can dissolve the protective oxide coating and catastrophically attack the exposed alloy surface beneath-- a process known as hot corrosion. We present...
Nagarajan, R, Manjini, S, Chattopadhyay, K, Aoki, K
The influence of a small amount of silicon (up to 6 at %) on the structure and microstructure of rapidly solidified equiatomic TiNi alloys is reported. It is shown that a small amount of silicon...
Metastable microstructures in rapidly solidified Ni rich TiNi alloys (1997)
Nagarajan, R, Ranganathan, S, Aoki, K, Chattopadhyay, K
The metastable microstructures in two rapidly solidified Ni rich Ti-Ni alloys are studied. A first report of the presence of a cubic phase with three times the lattice parameter of B2-TiNi in melt...
Nagarajan, R, Manjini, S, Chattopadhyay, K, Aoki, K
The influence of a small amount of silicon (up to 6 at %) on the structure and microstructure of rapidly solidified equiatomic TiNi alloys is reported. It is shown that a small amount of silicon...
Metastable microstructures in rapidly solidified Ni rich TiNi alloys (1997)
Nagarajan, R, Ranganathan, S, Aoki, K, Chattopadhyay, K
The metastable microstructures in two rapidly solidified Ni rich Ti-Ni alloys are studied. A first report of the presence of a cubic phase with three times the lattice parameter of B2-TiNi in melt...
Interplay of magnetism and superconductivity in thulium and lutetium nickel-borocarbides (1996)
Blundell, SJ, Brown, SR, Chow, KH, Cooke, DW, Cox, SFJ, Cottrell, SP, ...
Desktop and Network Performance Issues in Multimedia Conferencing and Collaboration (1995)
A. Desimone, R. Nagarajan, Y. T. Wang
This paper explores in detail the workstation and network performance issues for multimedia conferencing and collaboration. For concreteness of exposition, we consider two generic multimedia...
Microwave Properties of Borocarbide Superconductors LnNi2B2C (Ln = Y, Er, Tm, Ho) (1995)
Jacobs, T., Willemsen, Balam A., Sridhar, S., Nagarajan, R., Gupta, L. C., Hossain, Z., ...
We report measurements of the microwave surface impedance of the borocarbide family of superconductors LnNi2B2C (Ln=Y, Er, Tm, Ho). The experiments enable direct measurements of the superfluid...
Superconducting Borate Derivatives of 123 Cuprates (1994)
Mahesh, R, Nagarajan, R, Rao, CNR
Incorboratlon of $BO\frac{3-}{3}$ 1on stabilizes $YSr_2Cu_30_7,$ but the borate derivative Is non superconducting. Superconductivity ls not obtained by the partial substitution of Y by Ca In...
Oxyanion derivatives of cuprate superconductors superconducting 123 phosphates (1994)
Nagarajan, R, Ayyappan, S, Rao, CNR
While $YSr_2Cu_30_7$ cannot be prepared under ambient conditions, partial substitution of the phosphate group for copper, as in $YSr_2Cu_{2.8}$ $(PO_4)_{o.2}0_{y'}$ stabilizes this phase in the...
Bhat, SV, Rastogi, A, Kumar, N, Nagarajan, R, Rao, CNR
The low-field dependence of non resonant microwave absorption (MWA) in polycrystalline samples of $YBa_2Cu_3O_{7-\delta}$ with $0.1\leq \delta \leq0.5$ has been measured at $T< T_c$ along with...
Superconducting Borate Derivatives of 123 Cuprates (1994)
Mahesh, R, Nagarajan, R, Rao, CNR
Incorboratlon of $BO\frac{3-}{3}$ 1on stabilizes $YSr_2Cu_30_7,$ but the borate derivative Is non superconducting. Superconductivity ls not obtained by the partial substitution of Y by Ca In...
Bhat, SV, Rastogi, A, Kumar, N, Nagarajan, R, Rao, CNR
The low-field dependence of non resonant microwave absorption (MWA) in polycrystalline samples of $YBa_2Cu_3O_{7-\delta}$ with $0.1\leq \delta \leq0.5$ has been measured at $T< T_c$ along with...
Oxyanion derivatives of cuprate superconductors superconducting 123 phosphates (1994)
Nagarajan, R, Ayyappan, S, Rao, CNR
While $YSr_2Cu_30_7$ cannot be prepared under ambient conditions, partial substitution of the phosphate group for copper, as in $YSr_2Cu_{2.8}$ $(PO_4)_{o.2}0_{y'}$ stabilizes this phase in the...
A study of the glass-forming range in the ternary Ti-Ni-Al system by mechanical alloying (1994)
The glass-forming range (GFR) in ternary Ti-Ni-Al alloys was determined via mechanical alloying using a high energy Spex mill. The GFR was also calculated using Miedema's model. Although the...
Microstructural development in rapidly solidified Ti-Ni alloys (1994)
Nagarajan, R, Aoki, K, Chattopadhyay, K
The Ti-Ni binary system under non-equilibrium conditions offers an exciting range of metastable microstructures including nanodispersions in glassy and crystalline matrices. We report a systematic...
Rao, CNR, Nagarajan, R, Mahesh, R, Kulkarni, GV, Ayyappan, S, Subbanna, GN
When the Cu(1) site In orthorhombic $YBaSrCu_30_{7-\delta}$ $(T_c$ = 80 K), is partly substituted by the carbonate Ion (upto 50%), the crystal structure becomes tetragonal and the electron...
Superconducting $YBa_2Cu_3O_{7-\delta} (0.3 \leq \delta \leq 0.4)$ compositions seem to transform to a metastable $YBa_2Cu_4O_8$ (124)-like phase with a c parameter of 27.2 Å on annealing at 473 K...
Synthesis of cuprate superconductors (1993)
Rao, CNR, Nagarajan, R, Vijayaraghavan, R
There has been unprecedented activity pertaining to the synthesis and characterization of superconducting cuprates in the last few years. A variety of synthetic strategies has been employed to...
Synthesis of cuprate superconductors (1993)
Rao, CNR, Nagarajan, R, Vijayaraghavan, R
There has been unprecedented activity pertaining to t h e synthesis and characterization of superconducting cuprates in the last few years. A variety of synthetic strategies has been employed to...
Synthesis of cuprate superconductors (1993)
Rao, CNR, Nagarajan, R, Vijayaraghavan, R
There has been unprecedented activity pertaining to t h e synthesis and characterization of superconducting cuprates in the last few years. A variety of synthetic strategies has been employed to...
Superconducting $YBa_2Cu_3O_{7-\delta} (0.3 \leq \delta \leq 0.4)$ compositions seem to transform to a metastable $YBa_2Cu_4O_8$ (124)-like phase with a c parameter of 27.2 Å on annealing at 473 K...
Microstructural development in rapidly solidified Ti-Ni alloys (1993)
Nagarajan, R, Aoki, K, Chattopadhyay, K
The Ti-Ni binary system under non-equilibrium conditions offers an exciting range of metastable microstructures including nanodispersions in glassy and crystalline matrices. We report a systematic...
A study of the glass-forming range in the ternary Ti-Ni-Al system by mechanical alloying (1993)
The glass-forming range (GFR) in ternary Ti-Ni-Al alloys was determined via mechanical alloying using a high energy Spex mill. The GFR was also calculated using Miedema's model. Although the...
Rao, CNR, Nagarajan, R, Mahesh, R, Kulkarni, GV, Ayyappan, S, Subbanna, GN
When the Cu(1) site In orthorhombic $YBaSrCu_30_{7-\delta}$ $(T_c$ = 80 K), is partly substituted by the carbonate Ion (upto 50%), the crystal structure becomes tetragonal and the electron...
Nagarajan, R, Pavate, Vikram, Rao, CNR
Prompted by a literature report that thin films of $Pr_{0.5}Ca_{0.5}Ba_2Cu_3O_{7-\delta}$ are superconducting, the structure and bulk properties orthorhombic $Pr_{1-x}Ca_xBa_2 Cu_3O_{7-\delta}$ and...
Gopalakrishnan, J, Vijayaraghavan, R, Nagarajan, R, Shivakumara, C
There are two sources for a hole concentration in thallium cuprates, one arising from the chemistry and the other from the overlap of Tl (6s) with the conduction band of $CuO_2$ sheets. Our method...
Synthesis of Pb-Based Cuprate Superconductors by the Sol-Gel Method (1992)
Mahesh, R, Nagarajan, R, Rao, CNR
The sol-gel method provides a convenient means for preparing lead cuprates of the types $Pb_2Sr_{2-y}Ba_yLn{1-x}Ca_xCu_30_8$ (2213 type) with Ln = Y or rare earth and...
Synthesis of Pb-Based Cuprate Superconductors by the Sol-Gel Method (1992)
Mahesh, R, Nagarajan, R, Rao, CNR
The sol-gel method provides a convenient means for preparing lead cuprates of the types $Pb_2Sr_{2-y}Ba_yLn{1-x}Ca_xCu_30_8$ (2213 type) with Ln = Y or rare earth and...
Nagarajan, R, Pavate, Vikram, Rao, CNR
Prompted by a literature report that thin films of $Pr_{0.5}Ca_{0.5}Ba_2Cu_3O_{7-\delta}$ are superconducting, the structure and bulk properties orthorhombic $Pr_{1-x}Ca_xBa_2 Cu_3O_{7-\delta}$ and...
Gopalakrishnan, J, Vijayaraghavan, R, Nagarajan, R, Shivakumara, C
There are two sources for a hole concentration in thallium cuprates, one arising from the chemistry and the other from the overlap of Tl (6s) with the conduction band of $CuO_2$ sheets. Our method...
Determination of Hole Concentration in Superconducting Thallium Cuprates (1991)
Gopalakrishnan, J, Vijayaraghavan, R, Nagarajan, R, Shivakumara, C
A chemical method for the determination of hole concentration in superconducting thallium cuprates is described. The method is based on selective oxidation of bromide ion by holes on $CuO_2$ sheets....
Determination of Hole Concentration in Superconducting Thallium Cuprates (1991)
Gopalakrishnan, J, Vijayaraghavan, R, Nagarajan, R, Shivakumara, C
A chemical method for the determination of hole concentration in superconducting thallium cuprates is described. The method is based on selective oxidation of bromide ion by holes on $CuO_2$ sheets....
Solar desalination, brine and fine chemicals - a preliminary report (1991)
Shirodkar, P.V., Nagarajan, R.
Solar stills put into operation by taking known quantities of sea water of different salinities varying from 27. 75 - 36.27 x 103 during April-May 1990, indicated fresh water yield of 55-68% (av. 64)...
Rao, CNR, Nagarajan, R, Ganguli, AK, Subbanna, GN, Bhat, SV
Based on electron microscopy, nonresonant microwave absorption, electron paramagnetic resonance, and other studies, it is shown that in the $Yba_2Cu_3O_{7-\delta}$ system, compositions...
Nature and stability of the "60-K superconducting phase" in the $YBa_2Cu_3O_7-\delta$ system (1990)
Rao, CNR, Nagarajan, R, Ganguli, AK, Subbanna, GN, Bhat, SV
Based on electron microscopy, nonresonant microwave absorption, electron paramagnetic resonance, and other studies, it is shown that in the $YBa_2Cu_3O_7-\delta$ system, compositions with $\delta =...
Rao, CNR, Subbanna, GN, Nagarajan, R, Ganguli, AK, Ganapathi, L, Vijayaraghavan, R, ...
Careful investigations employing nonresonant microwave or rf absorption, $Cu^{2+}$ EPR spectra, X-ray diffraction, and electron microscopy show that orthorhombic $Yba_2Cu_3O_{7-\delta}$ is...
Rao, CNR, Nagarajan, R, Vijayaraghavan, R, Vasanthacharya, NY, Kulkarni, GV, Umarji, AM, ...
A systematic investigation of the properties of the series $Bi_2Ca_{1-x}Ln_xSr_2Cu_2O_{8+\delta}$ (Ln-rare earth or Y) of superconducting cuprates has been carried out by employing a variety of...