176,046 research outputs found
Scientometric portrait of Ram Gopal Rastogi
No full textPublication productivity of Indian scientist (R.G. Rastogi) has been documented.
Scientometric analysis of 312 papers by Ram Gopal Rastogi published during 1954 to 1992 in various domains: (a) Luni -solar activity and quiet -time E & F- region (57); (b) Equatorial electric field and low and mid latitude iof:osphere (78); (c) Ionospheric E- region irregularities (19); (dj Ionospheric F- region irregularities (32); and (e) Magnetic disturbance effects on the equatorial low and mid latitude ionosphere (23) were analysed. Interdomainery contents and of the number of papers: a+b were 36; b+c and b+d were 20 each; b+e were 16;. c+e were 5; a+e were 3; d+e were 2; and a+d had only one publication. Highest collaborations were with H. Chandra (61), M.R. Deshpande (42), and G. Sethia (19) out of his total 97 collaborators. His highest productivity was during 1978 with 28 papers followed by 19 papers during 1977. The core journals preferred by him for publishing papers were: Indian Journal of Radio & Space Physics, India, and Journal of Atomic & Terrestrial Physics, UK (59 each), followed by Proceedings of the Indian Academy of Sciences, India (34). Most prolific title keywords with their frequencies were: Ionosphere (92); Equatorial (61); F-region (53); Equatorial electrojet region (40), and Magnetic equator (30)
C. T. Kurien, E. R. Prabhakar, Gopal S. (éd.), Economy, Society and Development
No full textÉtienne Gilbert. C. T. Kurien, E. R. Prabhakar, Gopal S. (éd.), Economy, Society and Development. In: Tiers-Monde, tome 34, n°134, 1993. Agriculture, écologie et développement, sous la direction de Marc Dufumier. p. 478
C. T. Kurien, E. R. Prabhakar, Gopal S. (éd.), Economy, Society and Development
No full textÉtienne Gilbert. C. T. Kurien, E. R. Prabhakar, Gopal S. (éd.), Economy, Society and Development. In: Tiers-Monde, tome 34, n°134, 1993. Agriculture, écologie et développement, sous la direction de Marc Dufumier. p. 478
C. T. Kurien, E. R. Prabhakar, S. Gopal (ed.), Economy, Society and Development
No full textÉtienne Gilbert. C. T. Kurien, E. R. Prabhakar, S. Gopal (ed.), Economy, Society and Development. In: Tiers-Monde, tome 33, n°132, 1992. Le fait alimentaire : débats et perspectives, sous la direction de Emmanuel Calvo et Georges Courade. p. 938
Studies of medium infrared materials for nonlinear optical devices
No full textThe thesis describes the characterisation of ternary II-IV-V2 and I-III-VI2 semiconductors with a view to their application in medium infrared nonlinear optical devices. An extensive state-of-the-art of the properties of ternaries is presented. Detailed studies on linear optical and some other properties have been made of silver thiogallate (AgGaS2). Phasematched second harmonics were generated in AgGaS2 near a noncritical matching region. Transmission ranges of thirteen ternary compounds have been studied experimentally and basic physical phenomena identified. Two theoretical models have been developed; a semi-empirical force-constant model for predicting the infrared cut-offs, and a modified Sellmeier formula for the representation of refractive index dispersion.Methods for interpolating refractive indices have been studied in detail and the Sellmeier parameters for ternaries and some other medium infrared nonlinear materials are presented. Phase-matching conditions for second harmonic generation, parametric oscillation, up-conversion and down-conversion have been analysed for the following compounds; AgGaS Z' AgGaSe Z' ZnGeP2 ZnSiAs2 CdGeAs2 Ag3AsS3, Ag3SbS3, a-HgS, Te and CdSe. Particular emphasis is placed on techniques involved in the generation of tunable infrared radiation.Finally described is an entirely new method of generating infrared radiation tunable over a wide wavelength. range by the down-conversion of the outputs of a parametric oscillator with limited tuning
Biodiversity in wetlands: assessment, function and conservation. Vol. 2
No full textVol. 2 Preface Biodiversity of the French river Rhône and its floodplain: current state, historical changes and restoration potential Jean-François Fruget and Jean-Louis Michelot Biodiversity changes in the lower Danube river system A. Vadineanu, S. Cristofor and V. Iordache Plant diversity of fen landscapes in the Netherlands Jos T.A. Verhoeven and Roland Bobbink Factors influencing biodiversity in coastal plain wetlands of Southwestern Australia Jenny A. Davis, Stuart A. Halse and Ray H. Froend Wetlands of East Africa: biodiversity, exploitation and policy perspectives Lauren J. Chapman, J. Balirwa, F.W.B. Bugenyi, C. Chapman and T.L. Crisman Biodiversity and conservation of afrotropical wetland invertebrates Nic. Pacini and David M. Harper Diversity in some tropical wetland systems of South America Juan José Neiff Biodiversity in the pantanal wetland, Brazil Carolina Joana da Siva, Karl Matthias Wantzen, Cátia Nunes da Cunha and Francisco de Arruda Machado Biodiversity and management of Keoladeo National Park (India) - a wetland of International importance Malavika Chauhan and Brij Gopal South Asian wetlands and their biodiversity: the role of monsoons Brij Gopal and Malavika Chauhan Assessment, determinants, function and conservation of biodiversity in wetlands: present staus and future needs Brij Gopal and W.J. Jun
Some new fixed point theorems in fuzzy metric spaces
No full textMotivated by Samet et al. [Nonlinear Anal., 75(4) (2012), 2154-2165], we introduce the notions of alpha-phi -fuzzy contractive mapping and beta-psi-fuzzy contractive mapping and prove two theorems which ensure the existence and uniqueness of a fixed point for these two types of mappings. The presented theorems extend, generalize and improve the corresponding results given in the literature
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Scientometric analysis of synchronous references in the Physics Nobel lectures, 1981-1985 : a pilot study
No full textScientometric analysis of synchronous references in the nine Physics Nobel lectures by Nicolaas Bloembergen (1981), Arthur L. Schawlow (1981), Kai M. Siegbahn (1981), Kenneth G. Wilson (1982), Subrahmanyan Chandrasekhar (1983), William A. Fowler (1983), Carlo Rubbia (1984), Simon van der Meer (1984), and Klaus von Klitzing (1985) indicated high variations: No. of Synchronous References ranged from 24 (Meer) to 283 (Siegbahn); Synchronous Self-References ranged from 5 (Rubbia) to 88 (Siegbahn); synchronous references to others ranged from 10 (Chandrasekhar) to 255 (Wilson); Synchronous Self-Reference Rates ranged from 6.66 % (Rubbia) to 65.51 % (Chandrasekhar); Single-Authored References ranged from 15 (Klitzing) to 160 (Wilson); Multi-Authored References ranged from 4 (Chandrasekhar) to 194 (Siegbahn); Collaboration Coefficient in the synchronous references ranged from 0.14 (Chandrasekhar) to 0.75 (Klitzing); and Recency (age of 50 % of the latest references) ranged from 2 (Klitzing) to 18 (Chandrasekhar) years. Seventy five per cent of the references belonged to journal articles. Highly referred journals were Astrophysical Journal, Physical Review B, Physical Review Letters, Arkiv Fuer Fysik, Surface Science, Physics Letters, and IEEE Transactions on Nuclear Science.
See: Scientometrics Vol. 61 No.1, pp.55-68
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