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1.
The switchable optical properties of Pd-protected RCo2-type Ho0.6Mm0.4Co2 alloy thin films have been investigated in a KOH electrolyte. The reversible optical switching has been carried out simultaneously by measuring transmitted light through the thin film during electrochemical charging–discharging of hydrogen. The dependence of switching speed and cyclic durability of the film on the charging and discharging current density as well as concentration of KOH electrolyte has been studied. In addition, cyclic voltammetric measurements have been performed to examine the hydride formation and decomposition reactions. 相似文献
2.
3.
Lavanya Thirugnanam Manikandan Palanisamy Satheesh Kaveri Sundara Ramaprabhu Vilas G. Pol Mrinal Dutta 《International Journal of Hydrogen Energy》2021,46(2):2464-2478
TiO2 nanoparticles decorated nitrogen (N) doped helical carbon nanofiber (CNF)-carbon nanotube (CNT) hybrid material is prepared by low-cost electrospinning technique followed by hydrothermal method. Morphological investigations establish helical structure of CNFs with hierarchical growth of CNTs around CNFs. The hybrid material shows a high specific surface area of 295.17 m2 g?1 with nanoporous structure. X-ray photoelectron spectroscopic studies establish Ti–O–C/Ti–C bond mediated charge transfer channel between TiO2 nanoparticles and carbon structures with the success of N doping in CNFs. The electrospun hybrid material delivered high reversible charge capacities of 316 mAh g?1 (100th cycle) and 244 mAh g?1 (100th cycle) at a current density of 75 mA g?1 and 186 mA g?1 respectively. The charge capacities obtained for different applied current densities are higher than the conventional graphitic microporous microbeads anode. Results indicate that the hybrid material reported here shows high performance compare to graphite for LIBs. 相似文献
4.
Satendra Kumar T.S.N. Sankara Narayanan S. Ganesh Sundara Raman S.K. Seshadri 《Materials science & engineering. C, Materials for biological applications》2010,30(6):921-927
Fretting corrosion is one of the important reasons for the failure of prosthesis made of titanium and titanium alloys under in vivo condition. The fretting-corrosion behaviour of untreated, anodized and thermally oxidized commercially pure titanium (CP-Ti) in Ringer's solution was evaluated based on the change in free corrosion potential (FCP) measured as a function of time. A comparison of the performance of untreated, anodized and thermally oxidized CP-Ti under fretting-corrosion conditions is reported for the first time in this paper. The study reveals that surface modification of CP-Ti by both anodizing and thermal oxidation improved the fretting-corrosion resistance of CP-Ti and among them the performance of thermally oxidized CP-Ti is superior to that of the anodized one. Adhesive galling is the predominant wear mechanism for untreated CP-Ti, adhesive wear and delamination are found to be operative for anodized CP-Ti whereas an abrasive wear mechanism is operative for thermally oxidized CP-Ti when they are fretted against an alumina ball. 相似文献
5.
The influence of Mm substitution (Mm = mischmetal) on structural, transport and magnetic properties of (Dy1?xMmx)Co2 (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) alloys has been investigated by means of X-ray diffraction (XRD), temperature dependent electrical resistivity (ρ(T)), ac susceptibility (χ(T)) and thermopower (S(T)). XRD patterns show the formation of solid solutions crystallizing with cubic Laves (C15) type structure at room temperature. The pronounced discontinuities in the resistivity and thermopower at Curie temperature (TC) are explained based on the suppression of the spin-fluctuation contribution. The gradual decrease in TC and sharpness of discontinuities in ρ(T) and S(T) with increasing Mm substitution has been discussed. 相似文献
6.
Palladium nanocatalysts supported on surface-oxidized multiwalled carbon nanotubes (MWNT) were prepared by the aqueous solution reduction of PdCl2. MWNT have been synthesized by catalytic chemical vapor deposition (CCVD) technique. Pyrolysis of acetylene using a fixed-bed catalytic reactor over rare earth (RE) based AB2 alloy hydride catalyst, obtained through hydrogen decrepitation technique, has been performed to synthesize MWNT. Structural, morphological and vibrational characterizations have been carried out using XRD, SEM, TEM and Raman spectroscopy, respectively. In situ electrical resistance measurements for thin films of MWNT obtained by spin coating samples were carried out by two-probe technique in a chamber with provision to introduce known concentration of hydrogen in constant air flow. Investigations of hydrogen sensing properties of Pd–MWNT ensembles have been carried out. The stability of Pd–MWNT thin films after several cycles of adsorption and desorption was studied. The change in electrical resistance due to hydrogen adsorption is reversible, with increase to saturation on exposure to hydrogen gas. The results demonstrate that chemically treated MWNT functionalized with nanostructured Pd show good H2 sensing response at room temperature. 相似文献
7.
K.T.Sundara Raja Iyengar B.K.Raghu Prasad T.S. Nagaraj Bharti Patel 《Nuclear Engineering and Design》1996,163(3):397-403
The fictitious crack method (FCM) is applied to determine the load-deflection diagrams of notched plain concrete beams under three-point bending using various forms of strain softening in the stress-deformation relationship. The results indicate that there is a need to determine a more realistic relationship. 相似文献
8.
A generalised closed form expression for the power spectral density (PSD) of M-ary variable index continuous phase FSK (VI CPFSK) has been derived using the Transform technique. Examples are presented for typical cases with input levels 2, 4 and 8. Approximation results are presented for comparison. 相似文献
9.
B. Sundara 《Nutrient Cycling in Agroecosystems》1994,39(2):83-88
Varietal differences in P absorption and utilization by sugarcane were studied with the objective of selecting phosphorus efficient varieties which can perform well under conditions of low soil phosphorus availability and at low P application rates. Sugarcane varieties differed significantly in dry matter, cane and sugar yields, P-concentration and P-uptake. Based on the cane and sugar yield phosphorus efficiency indices, varieties were classified as P efficient and P-non-efficient. Phosphorus efficient varieties had low P-concentrations and produced higher dry matter per unit P absorbed. 相似文献
10.
Lakshmi Muthusubramanian Rajat B. Mitra Suseela Rajkumar V. S. Sundara Rao 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1998,72(2):164-168
Synthesis of some (thiocyanomethyl)-thio heteroaromatic derivatives by reacting metal salts of (mercapto) heteraromatics with chloromethylthiocyanate using methanol or acetone as cosolvent, reported. All the synthesized derivatives were identified by conventional methods, IR-, 1H NMR and mass spectral data. All the prepared compounds were tested for their antifungal activity. © 1998 SCI 相似文献