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  • 1
    Keywords: India ; Archean granitoids ; Indian cratons ; Archean supercontinents ; Archean tectonics ; early earth
    Description / Table of Contents: 8 January 2019 --- Deformation-driven emplacement-differentiation in the Closepet Pluton, Dharwar Craton, South India: an alternative view / Abhijit Bhattacharya / Geological Society, London, Special Publications, 489, --- Mineral-fluid interactions in the late Archean Closepet granite batholith, Dharwar craton, southern India / Ewa Slaby, Katarzyna Gros, Hans-Jürgen Förster, Alicja Wudarska, Łukasz Birski, Morihisa Hamada, Jens Götze, Hervé Martin, Mudlappa Jayananda, Jean-François Moyen and Izabela Moszumańska / Geological Society, London, Special Publications, 489, --- Dissecting through the metallogenic potentials of older granitoids - case studies from Bastar and Eastern Dharwar cratons India / Dinesh Pandit, Sourabh Bhattacharya and Mruganka Kumar Panigrahi / Geological Society, London, Special Publications, 489, --- Archaean granitoids of Bastar craton, Central India / M. E. A. Mondal, M. Faruque Hussain and Talat Ahmad / Geological Society, London, Special Publications, 489,
    Edition: online first
    Language: English
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  • 2
    Publication Date: 2015-10-10
    Description: Scanning electron microscopy has been identified as an important approach in studying scale microstructures in fish with reference to taxonomy. In this article, a detailed microstructural analysis of the scales of Channa barca , a poorly known snakehead fish was carried out the location of focus, inter-radial distance, average width and inter-circular space of anterior circulii; inter-circular distance and dentition in lateral circulii; the shape, spacing, length of lepidonts in anterior circulii and the number and width of radii were compared with those of a related species, Channa aurantimaculata . The location of the focus was found to be similar to those of the gachua group of the genus Channa but was different from those of the marulius group. There were major similarities—though with a few notable differences—in scale microstructures between C. barca and the aforementioned closely related species C. aurantimaculata , indicating that scale microstructure analysis has the potential to distinguish even closely related fish species . While several of the microstructural features of the scale were found to be similar to those of the gachua group, others were closer in nature to those of the marulius group. Some microstructural characteristics, however, were found to be totally different from those of both gachua and marulius groups. All of these characteristic features of scale microstructure in C. barca are discussed with reference to taxonomic significance.
    Print ISSN: 0022-0744
    Electronic ISSN: 1477-9986
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2015-02-13
    Description: Nickel aluminate is a transition metal oxide with spinel structure with potential applications as catalysts and sensors. Both applications benefit from high specific surface areas as well as chemical stoichiometry control. However, a systematic approach to understand synthetic parameters affecting stoichiometry and agglomeration of nickel aluminate nanoparticles is still lacking. In this work, co-precipitation using direct and reverse strikes and polymeric precursor techniques were comparatively studied to address this problem. While the polymeric method could deliver stoichiometric spinel, the samples were highly agglomerated exhibiting low surface area. Both co-precipitation procedures produced smaller sizes and less agglomerated nanoparticles as compared to the polymeric precursor, but for the reverse-strike, Ni 2+ preferentially formed a soluble complex with ammonia and led to nickel deficient nanoparticles. Stoichiometric (1 mol NiO:1 mol Al 2 O 3 ) nanocrystalline nickel aluminate was only achieved when using controlled excess Ni 2+ . The normal-strike lead to more stoichiometric compositions without need for excess cations, but the obtained nanoparticles were less homogeneous and showed smaller surface areas as compared to the reverse-strike method.
    Print ISSN: 0003-004X
    Electronic ISSN: 1945-3027
    Topics: Geosciences
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  • 4
    Publication Date: 2015-09-12
    Description: The study on structural, microstructural, magnetic, and hyperfine properties of nanosized Co 0.2 Zn 0.8 Fe 2 O 4 having particle size ∼18 nm (CZM) synthesized by high energy ball milling of Co 0.2 Zn 0.8 Fe 2 O 4 nanoparticles of size ∼20 nm (CZ) produced by flow rate controlled coprecipitation method has revealed that the inclusion of strain induced anisotropy produced by mechanical treatment and escalation of oxygen mediated intersublattice exchange interaction of spinel ferrites by tuning cation distribution properly, can improve the magnetic quality of nanosized ferrites significantly. This upshot will be of immense help in promoting the technological application of nanostructured ferrites. The Rietveld refinement of powder x-ray diffraction pattern and the analysis of transmission electron micrographs, energy dispersive x-ray spectrum, and FTIR spectrum of the sample have confirmed that CZM is single phase cubic nanometric spinel ferrite of Fd 3 ¯ m symmetry and it possesses large microstrain within its crystal lattice. The dc magnetic and Mössbauer spectroscopic studies together with indicate that the particles in the sample are composed of ferrimagnetically aligned core and spin-glass like shell and the system behaves superparamagnetically at 300 K. The saturation magnetization (44 and 87 emu g −1 at 300 and 10 K) and hyperfine field of the sample are substantially higher than its counterparts reported earlier. In spite of its lower size compared to CZ, the blocking temperature (∼220 K) of CZM is higher than that of CZ (70 K) and also that of its counterparts synthesized by chemical methods. The strengthening of the intersublattice A-O-B superexchange interaction because of migration of Fe 3+ ions from octahedral [B] to tetrahedral (A) sites in lieu of the relocation of Zn 2+ among (A) and [B] sites helps in enhancement of magnetization and hyperfine field of CZM. The giant coercivity (H C  ∼ 5600 Oe at 10 K) of CZM is accounted by the presence of spin glass like surface layer in the sample. Moreover, the system exhibits striking memory effect which can be suitably utilized in storing binary bits (0, 1) through magnetic field change in the cooling cycle of magnetization versus temperature profile, and the stored binary coded number can be faithfully retrieved in the heating cycle.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
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  • 5
    Publication Date: 2012-01-25
    Description: A blastocyst will implant only when the uterus becomes receptive. Following attachment, luminal epithelial cells undergo degeneration at the site of the blastocyst. Although many genes critical for uterine receptivity are primarily regulated by ovarian hormones, Kruppel-like factor 5 (KLF5), a zinc finger-containing transcription factor, is persistently expressed in epithelial cells independently of ovarian hormones. Loss of uterine Klf5 causes female infertility due to defective implantation. Cox2 is normally expressed in the luminal epithelium and stroma at the site of blastocyst attachment, but luminal epithelial COX2 expression is absent with loss of Klf5. This is associated with the retention of the epithelium around the implantation chamber with arrested embryonic growth. These results suggest that Klf5 is indispensable for normal implantation.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 6
    Publication Date: 2015-09-02
    Description: We examine the sensitivity of dust radiative feedback to the dust absorption property during the Indian summer monsoon (June-September) season from 2005-2010 using the Regional Climate Model (RegCM4.1). The dust direct radiative forcing at top of atmosphere (TOA) switches from cooling to warming for absorbing dust over the Indian subcontinent. The dust induced low pressure anomaly plays a crucial role in building up large scale convergence particularly over the Arabian Peninsula, which strengthens the monsoon circulation leading to enhanced precipitation over India. The intensity of precipitation and wind field at 850 hPa increases over India by considering more absorbing dust. Air temperature and cloud fraction change by 20-50% in the lower to mid-troposphere as a result of dynamic response due to modification in dust absorptive characteristics. Our results demonstrate that the response of monsoon circulation to dust radiative feedback is highly sensitive to dust absorption and hence it should be accurately represented in the models for improved simulation of monsoon precipitation. The results have important implications in case of break-to-active transition within the Indian summer monsoon season.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
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  • 7
    Publication Date: 2014-08-13
    Description: The authors find that for mechanically milled Ni 0.5 Zn 0.5 Fe 2 O 4 (∼10 nm), the mechanical strain induced enhancement of anisotropy energy helps to retain stable magnetic order. The reduction of magnetization can be prevented by keeping the cation distribution of nanometric ferrites at its equilibrium ratio. Moreover, the sample can be used in coding, storing, and retrieving of binary bit (“0” and “1”) through magnetic field change.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
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  • 8
    Publication Date: 2017-03-01
    Description: Stability and quench behavior against transient perturbation expected during operation of a fast cycling energy storage magnet is an important issue for its design and safe operation. Understanding of thermal stability in terms of minimum quench energy (MQE) of a superconducting cable under specific operating scenario is of primary importance for its magnet application. Process of current redistribution from quench strand to adjacent strands depends on inductive coupling and has influence on quench development in the cable. The electrodynamic and thermal behavior of a ten-strand Rutherford-type cable for SMES program in the centre is studied numerically in the framework of discrete network modeling. Influence of several parameters such as uncertainties of inter-strand transverse and adjacent resistance, cooling conditions with liquid helium, etc. on MQE and quench behavior of Rutherford cable is discussed in this paper.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 9
    Publication Date: 2017-03-07
    Description: Author(s): A. Indra, K. Dey, S. Majumdar, I. Sarkar, S. Francoual, R. P. Giri, N. Khan, P. Mandal, and S. Giri We report intrinsic memory effect in magnetization and dielectricity for the spin-chain compound Sm 2 BaNiO 5 , pointing the cooperative glassy response below ∼ 8 K . Signature of anomaly around 8 K is verified by the magnetization, heat capacity, dielectric permittivity, magnetostriction, and structural p… [Phys. Rev. B 95, 094402] Published Fri Mar 03, 2017
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 10
    Publication Date: 2016-08-26
    Description: Author(s): A. Chaudhuri, A. Sen, T. K. Ghosh, K. Banerjee, Jhilam Sadhukhan, S. Bhattacharya, P. Roy, T. Roy, C. Bhattacharya, Md. A. Asgar, A. Dey, S. Kundu, S. Manna, J. K. Meena, G. Mukherjee, R. Pandey, T. K. Rana, V. Srivastava, R. Dubey, Gurpreet Kaur, N. Saneesh, P. Sugathan, and P. Bhattacharya The fission fragment mass distributions have been measured in the reactions O 16 + W 184 and F 19 + Ta 181 populating the same compound nucleus Pb 200 * at similar excitation energies. It is found that the widths of the mass distributions increase monotonically with excitation energy, indicating the absence o… [Phys. Rev. C 94, 024617] Published Wed Aug 24, 2016
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
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