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Ahmadābād, India

Jasinski J.P.,Keene State College | Baldaniya B.B.,Mg Science Institute | Butcher R.J.,Howard University
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

In the title compound. C 10H 9Cl 2NO 2, the acetamide residue is twisted out of the phenyl ring plane by 25.40 (9)°. An intra-molecular C-H⋯O close contact is observed. The N atom of the butanamide unit forms an inter-molecular N-H⋯O hydrogen bond with the symmetry-related carbonyl O atom, inter-linking mol-ecules into a C(4) chain along [100]. Additional C-H⋯O inter-molecular inter-actions and Cl⋯Cl contacts [3.4364 (8) Å] contribute to the stability of the crystal packing. Source

Baldaniya B.B.,Mg Science Institute | Jasinski J.P.,Keene State College
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

In the title compound, C24H22N2O 4S, the central pyrimidine ring is significantly puckered, assuming a conformation inter-mediate between a boat and a screw boat. The nearly planar thia-zole ring (r.m.s. deviation = 0.0258 Å) is fused with the pyriamidine ring, making a dihedral angle of 9.83 (7)°. The carboxyl group is in an extended conformation with an anti-periplanar orientation with respect to the dihydropyrimidine ring. The benzene ring linked at the chiral C atom is perpendicular to the pyrimidine ring [dihedral angle = 85.21 (8)°] whereas the phenyl ring is nearly coplanar, making a dihedral angle of 13.20 (8)°. An intra-molecular C - H⋯S hydrogen bond is observed. The crystal packing is influenced by weak inter-molecular C - H⋯π inter-actions and π-π stacking between the thia-zole and phenyl rings [centroid-centroid distance = 3.9656 (10) Å], which stack the mol-ecules along the c axis. Source

Pandya C.V.,Mg Science Institute | Patel P.M.,P.A. College | Baluja K.L.,University of Delhi
Chinese Journal of Physics | Year: 2010

Theoretical studies of elastic electron scattering by a calcium atom have been made by employing a model complex optical potential (composed of static, exchange, polarization and absorption terms). The complex optical potential, free from any adjustable parameter, is treated exactly in a variable phase approach to yield scattering complex phase shifts and the differential scattering cross section in the intermediate energy region. The calculations were performed at electron impact energies 10, 60, and 100 eV. We report on the elastic, inelastic, and momentum transfer cross sections up to 500 eV and compare them with other results. The present method is quite simple in nature and is able to reproduce fairly well the experimental differential cross sections (DCS) and other cross sections in the present energy regions. © 2010 The Physical Society of the Republic of China. Source

Patel S.J.,M. S. University of Baroda | Joseph J.K.,M. S. University of Baroda | Bhatt N.Y.,Mg Science Institute
Journal of the Geological Society of India | Year: 2013

Synaeresis cracks are observed at different stratigraphic levels in shallow marine mixed siliciclastic-carbonate sediments of the Middle Jurassic rocks of the Patcham Island, Kachchh, Western India. Cracks are preserved as cast or grooves in micritic sandstone of the Kuar bet member of Kaladongar Formation and sandy allochem limestone of the Raimalro Limestone member of Goradongar Formation. It bear distinct morphology of simple, straight to gently curved, spindle-shaped, irregular, unbranched to branched at acute angle; interconnected curlicue forms of non-orthogonal pattern. The X-radiography shows sharp margin and tapering twigs which support to nullify the possible biogenic origin. These cracks are developed at sediment-water interface and sediment-sediment interface in aqueous conditions, where partial dewatering of sediments causes reduction of sediment volume and loss of plasticity. Formation of cracks are also post-depositional phenomenon operated during initial phase of diagenesis where induced stress is generated due to compaction of sediments and neomorphism/recrystallisation of the susceptible carbonate grains. © 2013 Geological Society of India. Source

Patel S.J.,M. S. University of Baroda | Joseph J.K.,M. S. University of Baroda | Bhatt N.Y.,Mg Science Institute
Journal of the Geological Society of India | Year: 2014

The middle Jurassic Goradongar Formation exposed in Goradongar hill represents a mixed siliciclasticcarbonate succession with shales and limestones. They contain a large number of well preserved trace fossils. Total 44 ichnospecies of 31 ichnogenera; representing diverse ethology, were grouped in five ichnoassemblages (Planolites, Palaeophycus, Gyrochorte, Rhizocorallium and Arenicolites assemblage). These recurring ichnoassemblages represent the Cruziana ichnofacies and occasionally a mixed Skolithos-Cruziana ichnofacies. Patterns of diversity and density of the trace fossils reveal changes in bathymetry, oxygen level, trophic level and the sub-strate conditions at the time of deposition. These paleoenvironment and palaeo-oceanography changes are co-relatable to world-wide Bathonian-Callovian (middle Jurassic) deposits. © 2014 Geological Society of India. Source

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