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61.
Nikoleta Theodoropoulou Vinith Misra John Philip Patrick LeClair Geetha P. Berera Jagadeesh S. Moodera Biswarup Satpati Tapobrata Som 《Journal of magnetism and magnetic materials》2006,300(2):407-411
Clear evidence of ferromagnetic behavior at temperatures >400 K as well as spin polarization of the charge carriers have been observed in Zn1−xMnxO thin films grown on Al2O3 and MgO substrates. The magnetic properties depended on the exact Mn concentration and the growth parameters. In well-characterized single-phase films, the magnetic moment is 4.8 μB/Mn at 350 K, the highest moment yet reported for any Mn doped magnetic semiconductor. Anomalous Hall effect shows that the charge carriers (electrons) are spin-polarized and participate in the observed ferromagnetic behavior. 相似文献
62.
63.
This paper describes the method of calculation of the eigenvalues, eigenvectors of the Jacobian matrix of the Euler equations augmented by the convective part of k–ω turbulence model. The equations are 3D and values are expressed in terms of cell normals of a finite volume. The expressions for wave strengths are also found, which are also necessary to calculate the inter‐cell fluxes for Roe's scheme. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
64.
Kinetics of oxidation of pantothenic acid (PA) by sodium N‐chloro‐p‐toluenesulfonamide or chloramine‐T (CAT) in the presence of HClO4 and NaOH (catalyzed by OsO4) has been investigated at 313 K. The stoichiometry and oxidation products are same in both media; however, their kinetic patterns were found to be different. In acid medium, the rate shows first‐order dependence on [CAT]o, fractional‐order dependence on [PA]o, and inverse fractional‐order on [H+]. In alkaline medium, the rate shows first‐order dependence each on [CAT]o and [PA]o and fractional‐order dependence on each of [OH?] and [OsO4]. Effects of added p‐toluenesulfonamide and halide ions, varying ionic strength, and dielectric constant of medium as well as solvent isotope on the rate of reaction have been investigated. Activation parameters were evaluated, and the reaction constants involved in the mechanisms have been computed. The proposed mechanisms and the derived rate laws are consistent with the observed kinetics. © 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: 201–210, 2005 相似文献
65.
Aerodynamic force measurement using 3-component accelerometer force balance system in a hypersonic shock tunnel 总被引:1,自引:0,他引:1
A new three-component accelerometer force balance has been designed, calibrated and tested in hypersonic shock tunnel (HST2)
of Indian Institute of Science. The newly designed balance is able to measure aerodynamic forces (within test time of one
millisecond) on test models at angles of attack from 0 to 12°. Two models, a blunt cone with after body and a blunt cone with
after body and frustum are used to establish the accuracy of the force balance. The tests were conducted for the above two
configurations with a constant Mach number of 8 and total enthalpy of 2.0 MJ/kg. The effectiveness of the balance is demonstrated
by comparing the forces and moments of measured data with AGARD models. The flow fields around the test model are simulated
using a 3D axisymmetric Navier–Stokes solver and the simulated results were compared with the measured values. Measured and
computed force data are matched within ±10% for two different models tested here. The accuracy of the force balance is also
estimated with the Newtonian theory and the values are approximately ±10% for the axial component and ±8% for the normal and
pitching moment components.
相似文献
66.
Lower bounds on the scalar dissipation rate in rectilinear flows are found for three sets of constraints. The bounding dissipation rates provide upper bound estimates of the scalar concentration variance. One of the lower bounds on the dissipation rate is close to the dissipation rate assessed from detailed numerical simulation. This proximity enables a simplified model of concentration variance. For a pulse input of solute, the predictions of concentration variance by the simplified model are in agreement with the results of detailed simulation. The large-time bimodality of the concentration variance and its rate of decay observed in the detailed numerical simulations is predicted by the simplified model. 相似文献
67.
Rajenahally V. Jagadeesh Y. Sree Sandhya P. Karthikeyan S. Sudhakar Reddy P. Pradeep Kumar Reddy M. Viniod Kumar 《合成通讯》2013,43(16):2343-2349
α-Chloroalkyl aryl ethers has been obtained in good yields from phenols and aryl α-chloroalkyl sulfides. 相似文献
68.
Umesh B. Kosurkar Tulshiram L. Dadmal K. Appalanaidu Y. Khageswara Rao Jagadeesh B. Nanubolu Ravindra M. Kumbhare 《Tetrahedron letters》2014
A highly, efficient synthetic protocol for the synthesis of 2-aminooxazolo[4,5-b]pyridine derivatives is established via intramolecular C–O bond coupling using copper iodide as a catalyst and water as solvent. A variety of functionalized substrates were found to react under this reaction conditions to provide products in good to excellent yields. 相似文献
69.
An efficient regioselective, catalyst free, and green protocol has been developed for the synthesis of a novel class of 4H-chromene scaffolds at room temperature in ionic liquid. The method is general and applicable for a series of 2H-chromenes as well as indole derivatives. 相似文献
70.
Sridhar Madabhushi Srinivas Kurva Venkata Sairam Vangipuram Vinodkumar Sriramoju Kishore Kumar Reddy Mallu Jagadeesh Babu Nanubolu 《Tetrahedron letters》2014
A simple and efficient method for the synthesis of polyfunctionalized 4H-thiopyrans by highly regioselective cyclocondensation of β-oxodithioesters with 1,1,3-trialkyl or aryl substituted prop-2-yn-1-ols using BF3·Et2O as the catalyst is described. 相似文献