122 research outputs found
Transition metal catalysed Grignard-like allylic activation across tetragonal tin(II) oxide
The reaction of allyl halide and a carbonyl compound under the aegis of tetragonal tin(II) oxide and catalytic d8, d10 metal complexes provides the corresponding homoallylic alcohol, via a novel allyl tin intermediate
Exploring the Factors that Determine Flow of Agricultural Credit to Indian States
The issue of agriculture and agricultural credit has always gained importance in the context of India. The present research looks at various important aspects of agricultural credit which include growth trends and determination of factors that influence flow of credit to the different states. The findings are based on analysis of twenty-nine states for the period 2007-08 to 2017-18. The empirical research shows wide disparity across regions with the maximum flow to the southern region and the minimum to the north-east of the country. The study traces the growth in agricultural loans and finds that nature of the curve is in the quadratic form where the rate of decline is much less compared to the rapid rise in the growth of loans in all the regions. With regard to the panel regression model, cropping intensity, lending rate and inflation rate have a significant effect on flow of credit to states (at 1% level). However, though the share of agriculture in the state GDP matches the expected sign, the coefficient is not significant even at 10%. The study is a unique one which is an improvement over the earlier studies. However, non-availability of data for all states and exclusion of non-financial considerations at the state level are limitations of the study
Palaeoseismicity in relation to basin tectonics as revealed from soft-sediment deformation structures of the Lower Triassic Panchet formation, Raniganj basin (Damodar valley), eastern India
The Raniganj basin in the Damodar valley of eastern India is located within the riftogenic Gondwana
Master-Basin. The fluvio-lacustrine deposits of the Lower Triassic Panchet formation of
the Damodar valley in the study area preserve various soft-sediment deformation structures such
as slump folds, convolute laminae, flame structures, dish-and-pillar structures, sandstone dykes,
pseudonodules and syn-sedimentary faults. Although such soft-sediment deformation structures
maybe formed by various processes, in the present area the association of these structures, their
relation to the adjacent sedimentary rocks and the tectonic and depositional setting of the formation
suggest that these structures are seismogenic. Movements along the basin margin and the
intra-basinal faults and resultant seismicity with moderate magnitude (2–5 on Richter scale) are
thought to have been responsible for the soft-sediment deformations.http://www.ias.ac.in/jess/nf201
Evidence of a new shell closed nucleus governing slow quasi-fission
Mass distributions of fission fragments arising from the slow quasi-fission
process have been derived by comparing the measured distributions with the
theoretical distributions based on compound nuclear fission model for several
reactions. The mass-distributions corresponding to quasi-fission events for all
the systems show the following common features: (1) they are double peaked with
fixed peak-centroids and nearly same width at different incident energies, (2)
the yield of quasi-fission events decreases with the increasing projectile
energy, and (3) peak corresponding to lighter fragment is observed at A
96 for all the systems, whereas the peak of heavier fragment increases linearly
with the mass of the di-nuclear system. All the above observations are quite
similar to the ones observed in well known asymmetric fission of actinides,
thus providing clear evidences of shell effect in slow quasi-fission where the
lighter fragment is possibly nuclei around Zr, a new doubly magic
nucleus. This finding has great implications in the study of nuclear reactions,
structure and particularly in super-heavy element synthesis where quasi-fission
is synonymous
Anatomy of a post-starburst minor merger: a multi-wavelength WFC3 study of NGC 4150
(Abridged) We present a spatially-resolved near-UV/optical study of NGC 4150,
using the Wide Field Camera 3 (WFC3) on board the Hubble Space Telescope.
Previous studies of this early-type galaxy (ETG) indicate that it has a large
reservoir of molecular gas, exhibits a kinematically decoupled core (likely
indication of recent merging) and strong, central H_B absorption (indicative of
young stars). The core of NGC 4150 shows ubiquitous near-UV emission and
remarkable dusty substructure. Our analysis shows this galaxy to lie in the
near-UV green valley, and its pixel-by-pixel photometry exhibits a narrow range
of near-UV/optical colours that are similar to those of nearby E+A
(post-starburst) galaxies. We parametrise the properties of the recent star
formation (age, mass fraction, metallicity and internal dust content) in the
NGC 4150 pixels by comparing the observed near-UV/optical photometry to stellar
models. The typical age of the recent star formation (RSF) is around 0.9 Gyrs,
consistent with the similarity of the near-UV colours to post-starburst
systems, while the morphological structure of the young component supports the
proposed merger scenario. The RSF metallicity, representative of the
metallicity of the gas fuelling star formation, is around 0.3 - 0.5 Zsun.
Assuming that this galaxy is a merger and that the gas is sourced mainly from
the infalling companion, these metallicities plausibly indicate the gas-phase
metallicity (GPM) of the accreted satellite. Comparison to the local mass-GPM
relation suggests (crudely) that the mass of the accreted system is around
3x10^8 Msun, making NGC 4150 a 1:20 minor merger. A summation of the pixel RSF
mass fractions indicates that the RSF contributes about 2-3 percent of the
stellar mass. This work reaffirms our hypothesis that minor mergers play a
significant role in the evolution of ETGs at late epochs.Comment: 28 pages, 2 tables, accepted for publication in Ap
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