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Stacked foil activation technique and Ge(Li) gamma ray spectroscopy have been used for the measurement of excitation functions
of197Au(α,xn) (x=1−3),197Au(α,2pn) and197Au(α,αn) reactions up to 50 MeV. The experimental cross-sections were compared with the predictions of pre-equilibrium hybrid model,
as well as with the more recent index model. A general agreement was found in all reactions using initial exciton numbern
0=4(4p0h) except for197Au(α,n) reaction, where index model gives fairly good agreement withn
0=5(5p0h). 相似文献
3.
R. K. Dutta R. N. Acharya V. Chakravortty A. G. C. Nair A. V. R. Reddy S. N. Chintalapudi S. B. Manohar 《Journal of Radioanalytical and Nuclear Chemistry》1998,232(1-2):91-96
Hot electron injection into aqueous electrolyte solution was studied with electrochemiluminescence and electron paramagnetic
resonance (EPR) methods. Both methods provide further indirect support for the previously proposed hot electron emission mechanisms
from thin insulating film-coated electrodes to aqueous electrolyte solution. The results do not rule out the possibility of
hydrated electron being as a cathodic intermediate in the reduction reactions at cathodically pulse-polarized thin insulating
film-coated electrodes. However, no direct evidence for electrochemical generation of hydrated electrons could be obtained
with EPR, only spin-trapping experiments could give information about the primary cathodic steps. 相似文献
4.
Kambhampati Sriramam Brahmandam S. R. Sarma Konidena Kalidas Janapati Sreelakshmi Chintalapudi Ramakrishna 《Transition Metal Chemistry》1993,18(2):231-237
Summary The natural decay of Fe(phen)
f3
p3+
, where no CeIV is employed for scavenging the side reaction product, Fe(phen)
f3
p2+
, is now treated as a complex reaction involving two parallel processes, and the experimental kinetics are consistent with the rate laws derived from a mechanism that simultaneously explains the composition of the products as a function of acidity. In terms of the proposed mechanism the dissociation rate of the complex ion in acid solutions containing CeIV as scavenging agent is to be regarded as a CeIV retarded aquation rate, and OH– is to be assigned a catalytic role in the kinetics of basic reduction. 相似文献
5.
R. K. Dutta D. Das M. Sudarshan S. N. Bhattacharyya S. N. Chintalapudi V. Chakravortty 《Journal of Radioanalytical and Nuclear Chemistry》1997,223(1-2):121-126
The iron bearing phases present in a ferromanganese nodule from the Central Indian Ocean have been determined using57Fe Mössbauer spectroscopy. The Mössbauer results have been corroborated by XRD, IR and TG-DTA studies. The Mössbauer spectrum of a ferromanganese nodule shows a broad line width which indicates the presence of more than one iron bearing paramagnetic oxide or oxyhydroxide phases where iron is present as Fe3+. -FeOOH has been distinctly characterised as one of the iron bearing phases in the nodule. Other oxyhydroxide and oxide phases of iron in the nodule have been ruled out. A typical paramagnetic doublet persists even at very high temperature which has been proposed to be due to iron(III)phosphate. Formation of solid solution of Mn2O3–Fe2O3 has been observed in the heat treated nodule at 1073 K, which has been characterised by the Mössbauer technique. 相似文献
6.
A. Saha V. Chakraborty R. K. Dutta S. N. Chintalapudi 《Radiation Physics and Chemistry》2001,62(5-6):429-431
Polypropylene was irradiated with 12C ions of 3.6 and 5.4 MeV energies in the fluence range of 5×1013–5×1014 ions/cm2 using 3 MV tandem accelerator. Ion penetration was limited to a few microns and surface modifications were investigated by scanning electron microscopy. At the lowest ion fluence only blister formation of various sizes (1–6 μm) were observed, but at higher fluence (1×1014 ions/cm2) a three-dimensional network structure was found to form. A gradual degradation in the network structure was observed with further increase in the ion fluence. The dose dependence of the changes on surface morphology of polypropylene is discussed. 相似文献
7.
M. V. S. Chandrasekhar Rao G. Sree Krishna Murty K. Radha Krishna S. Bhuloka Reddy G. Satyanarayana C. V. Raghavaiah D. L. Sastry S. N. Chintalapudi 《Zeitschrift für Physik A Hadrons and Nuclei》1990,335(1):25-29
TheK-electron capture probabilities for the 1/2? → 3/2? and 1/2? → 1/2+ transitions in the decay of105Ag were measured for the first time using the sum coincidence method. The experimental PK values were estimated to be 0.824 ± 0.042 and 0.851 ±0.046 for the allowed and first-forbidden beta transitions, respectively in agreement with the theory. The PL experimental values to these two levels were also computed using the experimental PL/PK values reported by earlier authors. These results are also found to be consistent with the theoretical PL values. 相似文献
8.
V. Ch. Venkaiah 《Proceedings Mathematical Sciences》1992,102(2):147-153
A new cryptosystem that uses modulo arithmetic operations is proposed. It is based on Rivest-Shamir-Adleman’s public key cryptosystem.
A feature of the proposed system is that the encryption and decryption procedures are computationally less intensive, and
hence the system is amenable for high data bit rate communications. 相似文献
9.
Mujahid Mohammad Venkaiah Chintalapudi Jeffrey M. Carney Steven J. Mansfield Pollyanna Sanderson Kirsten E. Christensen Edward A. Anderson 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(50):18345-18349
A highly convergent strategy for the synthesis of the natural product (?)‐rubriflordilactone B, and the proposed structure of (?)‐pseudo‐rubriflordilactone B, is described. Late stage coupling of diynes containing the respective natural product FG rings with a common AB ring aldehyde precedes rhodium‐catalyzed [2+2+2] alkyne cyclotrimerization to form the natural product skeleton, with the syntheses completed in just one further operation. This work resolves the uncertainty surrounding the identity of pseudo‐rubriflordilactone B and provides a robust platform for further synthetic and biological investigations. 相似文献
10.
V. Ch. Venkaiah 《Proceedings Mathematical Sciences》1996,106(1):69-77
Understanding Karmarkar’s algorithm is both desirable and necessary for its efficient implementation, for further improvement
and for carrying out complexity analysis. In this report an algorithm based on the concept of angular projection matrix, to
solve linear programming problems is derived. Surprisingly, this algorithm coincides with the affine version of Karmarkar’s
algorithm. 相似文献