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101.
102.
R K Bhowmik 《Pramana》2001,57(1):125-133
The new generation of detector arrays require complex instrumentation and data acquisition system to ensure increased reliability
of operation, high degree of integration, software control and faster data handling capability. The main features of some
of the existing multi-detector arrays like MSU 4π array, Gammasphere and Eurogam are summarized. The instrumentation for the
proposed INGA array in India is discussed. 相似文献
103.
Kuljeet Singh Z. Naik R. Kumar J. Goswamy D. Mehta N. Singh C. R. Praharaj E. S. Paul K. P. Singh R. P. Singh S. Muralithar N. Madhavan J. J. Das S. Nath A. Jhingan P. Sugathan R. K. Bhowmik 《The European Physical Journal A - Hadrons and Nuclei》2005,25(3):345-354
High-spin states in 123Cs, populated via the 100Mo ( 28Si, p4n) fusion-evaporation reaction at E
lab = 130 MeV, have been investigated employing in-beam γ-ray spectroscopic techniques. Rotational bands, built on πg
7/2, πg
9/2 and the unique-parity πh
11/2 orbitals, have been extended and evolve into bands involving rotationally aligned ν(h
11/2)2 and π(h
11/2)2 quasiparticles. A three-quasiparticle band based on the high-K πh
11/2 ⊗ νg
7/2 ⊗ νh
11/2 configuration has also been observed. Total Routhian Surface (TRS) calculations have been used to predict the nuclear shape
parameters ( β2, β4, γ) for the various assigned configurations. The assigned configurations have been discussed in the framework of a microscopic
theory based on the deformed Hartree-Fock (HF) and angular-momentum projection techniques. 相似文献
104.
Debipreeta Bhowmik Franco Buzzetti Gaetano Fiorillo Laura Franchini Tanjia Monir Syeda Paolo Lombardi Gopinatha Suresh Kumar 《Journal of Thermal Analysis and Calorimetry》2014,118(1):461-473
The interaction of 13- monophenylalkyl and diphenylalkyl berberine analogs with tRNAphe has been investigated using various thermochemical techniques like thermal melting, isothermal titration calorimetry, and differential scanning calorimetry experiments. Thermal melting studies revealed that all the analogs stabilized the tRNAphe better than berberine. The binding affinity for the analogs was of the order of 105 M?1. Calorimetry results suggested that the binding of these analogs was predominantly entropy driven with small negative enthalpy contribution to the standard molar Gibbs energy. The temperature dependence of the standard molar enthalpy changes yielded negative values of standard molar heat capacity changes for the complexation revealing substantial hydrophobic contribution in the RNA binding of these analogs. An enthalpy–entropy compensation behavior was also seen in all the systems. The diphenylalkyl analogs were found to be more effective tRNAphe binders compared to the monophenylalkyl analogs. The utility of the present work lies in understanding the structural and energetic aspects of the interaction of these berberine analogs with tRNA, which may be useful in the development of RNA-targeted drugs. 相似文献
105.
Pradip K. Bhowmik Corresponding author Haesook Han James J. Cebe Ronald A. Burchett Bharat Acharya Satyendra Kumar 《Liquid crystals》2013,40(12):1433-1440
Two dicationic salts with bis(triflimide) as counterions exhibited crystal-to-smectic liquid crystalline phase transitions (T m=41 and 37°C) and smectic-to-isotropic liquid phase transitions (T i=112, 136°C). They had a broad liquid crystalline phase range (71–99°C) and an excellent range of thermal stability (360–364°C). Their mixtures of various compositions also displayed liquid crystalline properties from r.t. to an extended range of temperatures. They exhibited fluorescence in 1, 2-dimethoxyethane and methanol. 相似文献
106.
Pradip K. Bhowmik Haesook Han Alexi K. Nedeltchev Hari D. Mandal Jose A. Jimenez-Hernandez Patrick M. McGannon 《Liquid crystals》2013,40(12):1389-1399
A series of azomethine dimers were prepared by condensation reactions of benzaldehyde, biphenylcarboxaldehyde and 9-anthraldehyde with various aromatic diamines of varying flexibility in ethanol in the presence of tosic acid. Their chemical structures were determined by Fourier transform infrared and 1H and 13C nuclear magnetic resonance (NMR) spectroscopies, as well as elemental analysis. Their thermal properties were also examined by using a number of experimental techniques, including differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), polarising optical microscopy (POM) and variable temperature X-ray diffraction (VTXRD). Azomethine dimer, prepared from benzaldehyde and 1,9-bis(4-aminophenoxy)nonane, exhibited a monotropic, nematic liquid-crystalline (LC) phase. The majority of the azomethine dimers containing biphenyl moieties exhibited enantiotropic, nematic LC phase on melting at relatively low temperatures, since they developed typical Schlieren, threaded or marbled textures in their LC phase. They also had accessible isotropisation temperatures well below their decomposition temperatures. Azomethine dimers containing anthracene moieties did not exhibit LC properties, but exhibited polymorphism as determined by POM and VTXRD in two cases. All of these azomethine dimers in the series had excellent thermal stability that was in the broad range of temperatures of 307–400°C depending on their degrees of aromaticity index. 相似文献
107.
Krishichayan A. Chakraborty S. Mukhopadhyay S. Ray N. S. Pattabiraman S. S. Ghugre R. Goswami A. K. Sinha S. Sarkar U. Garg P. V. Madhusudhana Rao S. K. Basu B. K. Yogi L. Chaturvedi A. Dhal R. K. Sinha M. Saha Sarkar S. Saha R. Singh R. K. Bhowmik A. Jhingan N. Madhavan S. Muralithar S. Nath R. P. Singh P. Sugathan 《The European Physical Journal A - Hadrons and Nuclei》2006,29(2):151-159
Yrast and near-yrast energy levels in the neutron-rich N ∼ 20 nuclei 34P, 36S were populated using transfer/deep-inelastic processes following the 34S + 115In reaction at an incident energy of 140MeV. The use of a multi-clover array has facilitated polarization measurements of
the observed γ-rays and necessitated some changes in the previously known level scheme. The observation of the negative-parity
levels in these nuclei on the periphery of the “island of inversion” is indicative of the influence of the intruder orbitals
on the level structure at low spins. Shell-model calculations indicate that the inclusion of the orbitals from the upper pf shell is important even for the low-lying positive-parity states. 相似文献
108.
109.
Pradip K. Bhowmik Haesook Han James J. Cebe Ronald A. Burchett Bharat Acharya Satyendra Kumar 《Liquid crystals》2003,30(12):1433-1440
Two dicationic salts with bis(triflimide) as counterions exhibited crystal-to-smectic liquid crystalline phase transitions (Tm=41 and 37°C) and smectic-to-isotropic liquid phase transitions (Ti=112, 136°C). They had a broad liquid crystalline phase range (71-99°C) and an excellent range of thermal stability (360-364°C). Their mixtures of various compositions also displayed liquid crystalline properties from r.t. to an extended range of temperatures. They exhibited fluorescence in 1, 2-dimethoxyethane and methanol. 相似文献
110.
A. Sharma J. Goswamy D. Mehta Jagbir Singh Harjeet Kaur B. Chand N. Singh R. K. Bhowmik P. N. Trehan 《Zeitschrift für Physik A Hadrons and Nuclei》1993,346(4):321-322
The high spin states in116Te were populated in the Ru(19F,p4n) reaction at Elab=90MeV and the subsequent deexcitation was studied using the γ-ray spectroscopic techniques. Ninteen new transitions have been added to extend the level scheme. A ΔI=2 rotational band is identified for the first time in an even-A Tellurium nucleus. 相似文献