16 research outputs found
A biobibliometric study on Prof. B. N. Koley, an eminent physiologist
No full text74-82This biobibliometric study is based on 251 papers of Prof. B. N. Koley published during 1958-2001. On the basis of collecteddata, this study examines year-wise distribution of papers, research group of the scientist and scattering of papers in differentcommunication channels. In addition, it finds out author productivity, spectrum of research activity through analysis of the titlekeywords, and productivity of Koley's research group. Finally, it shows that the data set does not follow Bradford distribution
On the Span of ℓ Distance Coloring of Infinite Hexagonal Grid
No full textFor a graph G(V, E) and ℓ ∈ N, an ℓ distance coloring is a coloring f : V → {1, 2, . . ., t} of V with t colors such that ∀u, v ∈ V, u ̸= v, f(u) ̸= f(v) when d(u, v) ≤ ℓ. Here d(u, v) is the distance between u and v and is equal to the minimum number of edges that connect u and v in G. The span of ℓ distance coloring of G, χℓ(G), is the minimum t among all ℓ distance coloring of G. A class of channel assignment problem in cellular network can be formulated as a distance graph coloring problem in regular grid graphs. The cellular network is often modelled as an infinite hexagonal grid H, and hence determining χℓ(H) has relevance from practical point of view. Jacko and Jendrol [Discussiones Mathematicae Graph Theory, 2005] determined the exact value of χℓ(H) for any odd ℓ and for even ℓ ≥ 8, it is conjectured that χℓ(H) = - 3 8 (ℓ + 4 3 )2 - where [x] is an integer, x ∈ R and x− 1 2 \u3c [x] ≤ x+ 1 2 . For ℓ = 8, the conjecture has been proved by Ghosh and Koley [22nd Italian Conference on Theoretical Computer Science, 2021]. In this paper, we prove the conjecture for any even ℓ ≥ 10
Non-uniqueness of Hölder continuous solutions for Inhomogeneous Incompressible Euler flows
No full textWe consider the inhomogeneous (or density dependent) incompressible Euler equations in a three-dimensional periodic domain. We construct density and velocity such that, for any , both of them are -Hölder continuous and is a weak solution to the underlying equations. The proof is based on typical convex integration techniques using Mikado flows as building blocks. As a main novelty with respect to the related literature, our result produces a Hölder continuous density.41 pages. arXiv admin note: text overlap with arXiv:2006.06482, arXiv:2101.09278 by other author
Non-uniqueness of Hölder continuous solutions for stochastic Euler and Hypodissipative Navier-Stokes equations
No full textHere we construct infinitely many Hölder continuous global-in-time and stationary solutions to the stochastic Euler and hypodissipative Navier-Stokes equations in the space for , with and respectively. A modified stochastic convex integration scheme, using Beltrami flows as building blocks and propagating inductive estimates both pathwise and in expectation, plays a pivotal role to improve the regularity of Hölder continuous solutions for the underlying equations. As a main novelty with respect to the related literature, our result produces solutions with noteworthy Hölder exponents.38 pages. arXiv admin note: substantial text overlap with arXiv:2401.09894 by other author
INDIAN JOURNAL OF PHYSIOLOGY AND ALLIED SCIENCES: AN ANALYSIS OF CITATION PATTERN
No full text23-26The present study covers 457 citations appended to 26 research articles published in the four issues of the quarterly Indian Journal of Physiology and Allied Sciences,vol. 55(200 1). The articles are contributed by 75 authors (74 - Indian). From the citation count it appears that the solo research in physiology is quite substantial (about 24%). Though about 77% of the work is the result of team research, the team size is found to be small ranging from 2 to 5. Of the citations, 76.81 per cent relate to journal articles, 18.59 to monographs, and the rest to conference papers, theses, etc. The ratio of Indian to foreign citations is found to be almost 1:6. Of the total citations, 4.59 percent are author self citations, and 2.84 percent are journal self citations. Of the citing articles one is single- authored,10 are two-authored, 9 three-authored, 4 four-authored, and one each five- authored and six-authored. No collaboration was noticed in the case of 23 citing articles.The remaining 3 articles were the results of two-institution collaboration
Nobel Laureate Anthony J Leggett: A scientometric portrait
No full textThis paper attempts to analyse the publication productivity of Anthony J. Leggett, the 2003 Nobel Prize winner in physics. His contributions peaked in 1987, 1994, and 1998 with 10 papers each. He had 194 publications during 1964 - 2004 in domains like Superfluid 3He (65), Foundations of Quantum Mechanics (36), Dissipative Quantum Systems (24), Atomic Alkali Gases (18), and Miscellaneous (51)which were analysed for authorship pattern with his 70 collaborators. Most active collaborators with Anthony J Leggett were: A. Garg with six papers and A. O. MCaldeira, D. M. Ginsberg, D. J. Vanharlingen , F. Sols, S.Takagi and D. A. Wollman with five papers each. His productivity coefficient was 0.60 which clearly indicates that his productivity
increased after 50 percentile age. The highest degree of collaboration (1) for Anthony J. Leggett was found during 1964, 1971 and 1983. Journals have been the most preferred channel of communication, where as many as 139 papers out of 194 have been published. The core journals publishing his papers were: Phys. Rev. Leu. (42), Phys. Rev. B (9), J. Low Temp. Phys. (8),Phys. Rev. A (7), Ann. Phys. (6), Foundations of physics (6), J. Phys.(5), Prog. Theor: Phys. (5), and Rev. Mod. Phys. (5).Publication density was 3.02 and publication concentration was 3.59
Lewis acid mediated three-component one-flask regioselective synthesis of densely functionalized 4-amino-1,2-dihydropyridines via cascade Knoevenagel/Michael/cyclization sequence
No full textA highly convergent and regioselective one-pot synthesis of hitherto unreported 4-amino-1,2-dihydropyridines has been achieved via three-component domino coupling (3CDC) of α-oxoketene-N,S-arylaminoacetals, aldehydes, and malononitrile in the presence of InCl3 under solvent-free conditions. The merit of this cascade Knoevenagel condensation/Michael addition/cyclization sequence is highlighted by its atom-economy, efficacy of forming consecutive three new bonds (two C–C and one C–N), and one ring in a single operation. Noteworthy, the presence of nitrile and amino groups at 3- and 4-positions of 1,2-dihydropyridine ring makes these compounds excellent precursors for further synthetic renovations. Remarkably, one of the newly synthesized 4-amino-1,2-dihydropyridine exhibited high selectivity and sensitivity for Fe3+ ion over other metal ions
Switching Selectivity of α‑Enolic Dithioesters: One Pot Access to Functionalized 1,2- and 1,3-Dithioles
No full textAn
operationally simple cascade protocol has been developed for
the construction of 1,2- and 1,3-dithiole derivatives from α-enolic
dithioesters. 1,2-Dithioles are achieved by the reaction of dithioesters
with elemental sulfur in the presence of InCl3 under solvent-free
conditions. 1,3-Dithioles have been constructed via DABCO mediated
self-coupling of dithioesters in open air enabling the formation of
two new C–S bonds and one ring in a single operation in contiguous
fashion. The reactions proceeded smoothly affording the desired sulfur-rich
heterocycles in good to excellent yields, exhibiting gram-scale ability
and broad functional group tolerance utilizing easy to handle cheap
and easily available reagents. The probable mechanisms for the formation
of 1,2- and 1,3-dithioles from α-enolic dithioesters have been
suggested
