C. S. Sundar

  • Citations Per Year
Learn More
Oxide dispersion strengthened ferritic steels (ODS) are being considered for structural components of future designs of fission and fusion reactors because of their impressive high-temperature mechanical properties and resistance to radiation damage, both of which arise from the nanoscale oxide particles they contain. Because of the critical importance of(More)
A simple and efficient one pot synthesis of 2-amino-4H-chromen-4-yl phosphonate derivatives has been accomplished by the condensation of salicylaldehyde, malononitrile/ethylcyanoacetate and triethyl phosphite/trimethyl phosphite in the presence of molecular iodine as catalyst in water at room temperature. All the reactions were very clean and the products(More)
We adopt the Ensemble Empirical Mode Decomposition (EEMD) method, with an appropriate thresholding on the Intrinsic Mode Functions (IMFs), to denoise the magnetocardiography (MCG) signal. To this end, we discuss the two associated problems that relate to: (i) the amplitude of noise added to the observed signal in the EEMD method with a view to prevent mode(More)
Time differential perturbed angular correlation measurements using the (181)Ta probe in La(0.7)Sr(0.3)Mn(0.995)Hf(0.005)O(3) reveal the presence of two distinct hyperfine components, identified with probe atoms occupying Mn sites which are rich and deficient in hole concentration. The Mn(4+) rich zones exhibit ferromagnetic ordering at all temperatures(More)
This paper reports the effect of dimensions of microcantilever (MC) on its resonance frequency and bending upon adsorption of water molecules. Study is conducted on three MCs having the dimensions of 450 × 40 × 2.5 μm(3) (MC1), 225 × 30 × 3 μm(3) (MC2) and 125 × 35 × 4.5 μm(3) (MC3). The measured resonant frequency showed the expected negative shift in MC1,(More)
Amorphous to crystalline transition in pressure quenched Zr(0.5)Hf(0.5)W(2)O(8) has been studied with respect to local structures of ZrO(6) using the perturbed angular correlation technique. In an untreated crystalline sample close to 0.7 fraction of the probe atoms occupy Zr sites of regular ZrO(6) while the remaining three fractions are understood to be(More)
We calculate properties like equilibrium lattice parameter, bulk modulus and monovacancy formation energy for nickel (Ni), iron (Fe) and chromium (Cr) using Kohn-Sham density functional theory (DFT). We compare the relative performance of local density approximation (LDA) and generalized gradient approximation (GGA) for predicting such physical properties(More)
Rectification is observed in a single n-ZnO/p++-Si nanoheterojunction using ultra high vacuum compatible scanning tunneling microscope. The nanohetrojunctions have been grown using catalyst free vapor-solid growth of ZnO nanorods on p++-Si substarte. A high rectification ratio approximately 100 at 2 V is observed in the current voltage measurements.(More)