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31.
BRAJESH NARAYAN 《Pramana》2016,87(2):25
In this article, an extended and modulated version of the classic Su–Schrieffer–Heeger model is analysed. The nature of the end modes and the effect of cyclic modulation of the hopping parameters are studied in detail. The analysis is extended to the case of an array of linear chains described by the Su–Schrieffer–Heeger model, where the robustness of the end states for a large range of coupling strengths between the chains is found. 相似文献
32.
Pramana - In this review we have outlined a very brief history of the Higgs boson search and the development of the strategies for searching for the Higgs boson in its diphoton decay channel. We... 相似文献
33.
S BHATTACHARYA T K RANA C BHATTACHARYA S KUNDU K BANERJEE T K GHOSH G MUKHERJEE R PANDEY P ROY 《Pramana》2014,83(5):673-682
The prediction of Hoyle state was necessitated to explain the abundance of carbon, which is crucial for the existence of life on Earth and is the stepping stone for understanding the abundance of other heavier elements. After the experimental confirmation of its existence, soon it was realized that the Hoyle state was ‘different’ from other excited states of carbon, led to intense theoretical and experimental activities over the past few decades to understand its structure. In recent times, precision, high statistics experiments on the decay of Hoyle state have been performed at the Variable Energy Cyclotron Centre, to determine the quantitative contributions of various direct 3 α decay mechanisms of the Hoyle state. The present results have been critically compared with those obtained in other recent experiments and their implications have been discussed. 相似文献
34.
PARK ChongYeon GHOSH Trisha MENG ZeDa KEFAYAT Ullah VIKRAM Nikam OH WonChun 《催化学报》2013,34(4):711-717
CuS-graphene oxide/TiO2 composites were prepared using a sol-gel method to improve the photocatalytic performance of the photocatalyst. The composites were characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis, and transmission electron microscopy. The photocatalytic activities were examined by the degradation of methylene blue (MB) under visible-light irradiation. The photodegradation of MB under visible-light irradiation reached 90.1% after 120 min. The kinetics of MB degradation was plotted alongside the values calculated from the Langmuir-Hinshelwood equation. The CuS-graphene oxide/TiO2 sample prepared using 0.2 mol of TiO2 showed the best photocatalytic activity. This was attributed to a cooperative reaction as a result of increased photoabsorption by graphene oxide and an increased photocatalytic effect by CuS. 相似文献
35.
SUBALA MONDAL SUMON RAY ANIMESH CHATTOPADHYAY DEBABRATA NANDI ROSHNI SARKAR ALAK KUMAR GHOSH 《国际化学动力学杂志》2014,46(10):587-596
The kinetics of the interactions between three sulfur‐containing ligands, thioglycolic acid, 2‐thiouracil, glutathione, and the title complex, have been studied spectrophotometrically in aqueous medium as a function of the concentrations of the ligands, temperature, and pH at constant ionic strength. The reactions follow a two‐step process in which the first step is ligand‐dependent and the second step is ligand‐independent chelation. Rate constants (k1 ~10?3 s?1 and k2 ~10?5 s?1) and activation parameters (for thioglycolic acid: ΔH1≠ = 22.4 ± 3.0 kJ mol?1, ΔS1≠ = ?220 ± 11 J K?1 mol?1, ΔH2≠ = 38.5 ± 1.3 kJ mol?1, ΔS2≠ = ?204 ± 4 J K?1 mol?1; for 2‐thiouracil: ΔH1≠ = 42.2 ± 2.0 kJ mol?1, ΔS1≠ = ?169 ± 6 J K?1 mol?1, ΔH2≠ = 66.1 ± 0.5 kJ mol?1, ΔS2≠ = ?124 ± 2 J K?1 mol?1; for glutathione: ΔH1≠ = 47.2 ± 1.7 kJ mol?1, ΔS1≠ = ?155 ± 5 J K?1mol?1, ΔH2≠ = 73.5 ± 1.1 kJ mol?1, ΔS2≠ = ?105 ± 3 J K?1 mol?1) were calculated. Based on the kinetic and activation parameters, an associative interchange mechanism is proposed for the interaction processes. The products of the reactions have been characterized from IR and ESI mass spectroscopic analysis. A rate law involving the outer sphere association complex formation has been established as 相似文献