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21.
The equations determining the localization of interference fringes produced by rotation of the photographic plate in ‘focused-image holography’ are derived for an arbitrary cylindrical surface. The important properties of fringe localization are discussed and are experimentally verified. 相似文献
22.
S. S. Chawla P. K. Srivastva 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》2006,59(4):793-814
Fluid motion induced by the torsional oscillations (of angular velocity bΩcosω T) of an infinite disk in contact with an incompressible viscous rotating (with angular velocity aΩ) fluid of semi-infinite extent is analysed when the amplitude parameter α( = b/a) varies from zero to infinity. Composite solutions valid over the whole of the flow regime and specific expressions for the
shearing stress components at the disk and for the axial flow in the far region are obtained for low and high frequencies
of torsional oscillations. Using the method of matched asymptotic expansions, we find that the region of the mean flow increases
with α and reaches a maximum before settling down to the Rosenblat profile. Series expressions (for α < 1) are deduced for
physical quantities of interest when the fluid in the far field and the disk are rotating with different angular velocities
(in the same or in the opposite sense), which agree well with the known numerical results. 相似文献
23.
A convenient single step synthesis of p-thiomethylmethylcalixarenes and metal ion extraction studies
A facile synthesis of p-thiomethylmethylcalixarenes through a [2,5] sigmatropic rearrangement and extraction of soft heavy metal ions using the prepared calix[4]arene derivative is reported here. 相似文献
24.
Lanthanide induced shifts have been shown to provide reliable information on the steric disposition of protons in the vicinity of the sulfoxide group in penicillin derivatives and analogs. Because of its dipolar nature the sulfoxide bond serves as a favored site for complex formation with the lanthanide. The configuration of several penam sulfoxides and the conformation of the thiazolidine ring of one of them have been deduced. 相似文献
25.
N. C. Jayadevan K. L. Chawla K. D. Singh Mudher N. D. Dahale D. M. Chackraburtty 《Journal of Radioanalytical and Nuclear Chemistry》1984,82(1):125-134
An X-ray fluorescence binary ratio method to measure non-destructively the relative percentage of PuO2 in (U, Pu)O2 samples is described. Calibration lines for pellet and microsphere samples are established and evaluated. Independent X-ray measurement of the major component after dissolution leads to the determination of individual concentrations within ±0.5% rel. of the chemical values. 相似文献
26.
27.
Functionalization of 4-methyl group in cycloartane-type triterpenoids has been accomplished utilizing, in the key step, photolytic decomposition of an hypoiodite derived from a 3β-hydroxymethyl-4,4-dimethyl precursor. The synthesis of cycloeucalanone from cyclolaudanone is reported. 相似文献
28.
29.
M. M. Chawla 《BIT Numerical Mathematics》1970,10(2):145-155
For estimating the error of a Gaussian quadrature by Davis' method, we investigate here the possibility of using a Hilbert space resulting from the weighted line integral inner product with the weight used in the quadrature formula itself. 相似文献
30.