Journal articles: 'Nachbin'

1

Mujica, Jorege. "Leopoldo Nachbin (1922–1993)." Results in Mathematics 25, no. 3-4 (May 1994): 195–97. http://dx.doi.org/10.1007/bf03323405.

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Arhippainen, J., and J. Kauppi. "Nachbin spaces asCQ∗-algebras." Journal of Mathematical Analysis and Applications 400, no. 2 (April 2013): 568–74. http://dx.doi.org/10.1016/j.jmaa.2012.11.049.

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Richmond, Thomas A. "Posets of ordered compactifications." Bulletin of the Australian Mathematical Society 47, no. 1 (February 1993): 59–72. http://dx.doi.org/10.1017/s0004972700012260.

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If (X′, τ′, ≤′) is an ordered compactification of the partially ordered topological space (X, τ, ≤) such that ≤′ is the smallest order that renders (X′, τ′, ≤′) a T2-ordered compactification of X, then X′ is called a Nachbin (or order-strict) compactification of (X, τ, ≤). If (X′, τ′, ≤*) is a finite-point ordered compactification of (X, τ, ≤), the Nachbin order ≤′ for (X′, τ′) is described in terms of (X, τ, ≤) and X′. When given the usual order relation between compactifications (ordered compactifications), posets of finite-point Nachbin compactifications are shown to have the same order structure as the poset of underlying topological compactifications. Though posets of arbitrary finite-point ordered compactifications are shown to be less well behaved, conditions for their good behavior are studied. These results are used to examine the lattice structure of the set of all ordered compactifications of the ordered topological space (X, τ, ≤).

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Bezhanishvili, Guram, and Patrick J. Morandi. "Proximity Biframes and Nachbin Spaces." Applied Categorical Structures 25, no. 6 (December 24, 2016): 1077–95. http://dx.doi.org/10.1007/s10485-016-9476-5.

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Silva, Clovis Pereira da. "The Work of the Mathematician Leopoldo Nachbin (1922-1993) from FNFi." Revista Brasileira de História da Matemática 19, no. 38 (October 8, 2020): 183–03. http://dx.doi.org/10.47976/rbhm2019v19n38183-103.

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In this paper we discuss the professional activity of Leopoldo Nachbin (1922-1993) in the period in which he worked at National Faculty of Philosophy of the University of Brazil (FNFi/UB, in Portuguese) until his retirement by Institute of Mathematics of the Federal University of Rio de Janeiro (IM/UFRJ, in Portuguese). We identify the influence played by some mathematicians such as G. Mammana (1893-1980), L. Schwartz (1915-2002), A. Monteiro (1907-1980), A. Weil (1906-1998), J. Dieudonné (1906-1992), M. Stone (1903-1989), and A. A. Albert (1905-1972) in the professional training of L. Nachbin. We also address the serious difficulties he encountered in the Mathematics Department of FNFi when he was entered in the competition, opened in 1950, for the post of full Professor (Professor Catedrático) of Mathematics and Superior Analysis of FNFi. We emphasize in the paper, that the period from 1947 to the 1960s marks the most creative and productive phase in terms of scientific research in the academic life of L. Nachbin.

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Mehta, Ghanshyam. "Order extension of order monomorphisms on a preordered topological space." International Journal of Mathematics and Mathematical Sciences 16, no. 4 (1993): 663–68. http://dx.doi.org/10.1155/s0161171293000821.

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Gamon, Margaret A., and D. C. Kent. "A note on ordered planes." International Journal of Mathematics and Mathematical Sciences 15, no. 1 (1992): 199–202. http://dx.doi.org/10.1155/s0161171292000231.

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Kent, D. C., Dongmei Liu, and T. A. Richmond. "On the Nachbin compactification of products of totally ordered spaces." International Journal of Mathematics and Mathematical Sciences 18, no. 4 (1995): 665–76. http://dx.doi.org/10.1155/s0161171295000858.

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9

Herden, G. "On a lifting theorem of Nachbin." Mathematical Social Sciences 19, no. 1 (February 1990): 37–44. http://dx.doi.org/10.1016/0165-4896(90)90036-7.

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10

Kent, D. C., and Dongmei Liu. "The Nachbin compactification via convergence ordered spaces." International Journal of Mathematics and Mathematical Sciences 16, no. 4 (1993): 645–52. http://dx.doi.org/10.1155/s0161171293000791.

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We construct the Nachbin compactification for aT3.5-ordered topological ordered space by tailing a quotient of an ordered convergence space compactification. A variation of this quotient construction leads to a compactification functor on the category ofT3.5-ordered convergence ordered spaces.

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11

Boyd, C. "Exponential Laws for the Nachbin Ported Topology." Canadian Mathematical Bulletin 43, no. 2 (June 1, 2000): 138–44. http://dx.doi.org/10.4153/cmb-2000-021-x.

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AbstractWe show that for U and V balanced open subsets of (Qno) Fréchet spaces E and F that we have the topological identityAnalogous results for the compact open topology have long been established. We also give an example to show that the (Qno) hypothesis on both E and F is necessary.

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Yaremenko, Mykola Ivanovich. "Weil-Nachbin Theory for Locally Compact Groups." PROOF 2 (December 8, 2022): 174–80. http://dx.doi.org/10.37394/232020.2022.2.23.

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13

Oubbi, L. "A theorem of Nachbin-Shirota type for algebras." Archiv der Mathematik 61, no. 3 (September 1993): 229–37. http://dx.doi.org/10.1007/bf01198718.

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Boyd, C., and A. Peris. "A Projective Description of the Nachbin-Ported Topology." Journal of Mathematical Analysis and Applications 197, no. 3 (February 1996): 635–57. http://dx.doi.org/10.1006/jmaa.1996.0044.

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15

Cossich Ramos, Marília. "Análise bibliométrica da produção discente dos cursos de pós-graduação do Instituto de Matemática da UFRJ." Biblionline 16, no. 3/4 (February 16, 2021): 64–68. http://dx.doi.org/10.22478/ufpb.1809-4775.2020v16n3/4.57052.

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Apresenta as teses e dissertações produzidas pelos alunos dos cursos de Pós-graduação do Instituto de Matemática da Universidade Federal do Rio de Janeiro. Tem por objetivo mapear a produção científica dos últimos dez anos dos discentes dos Programas de pós-graduação do Instituto de Matemática da Universidade Federal do Rio de Janeiro. A metodologia utilizada foi uma pesquisa descritiva de caráter quantitativo por amostragem. O universo foram os cursos dos Programas de pós-graduação do Instituto de Matemática da Universidade Federal do Rio de Janeiro. A coleta dos dados foi realizada na base bibliográfica da universidade, a Base Minerva, a fim de se obter o número de teses e dissertações produzidas e somente aquelas que foram depositadas na Biblioteca Leopoldo Nachbin. Os resultados obtidos foram os números de teses e dissertações referentes à produção dos alunos dos cursos da pós-graduação cujos trabalhos foram depositados na Biblioteca Leopoldo Nachbin. Conclui ressaltando a importância da Biblioteca Digital de Teses e Dissertações para a divulgação e popularização da ciência. Palavras-chave: Educação. Programas de pós-graduação. Bibliotecas universitárias.

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16

Kent, D. C., and G. D. Richardson. "Ordered probabilistic metric spaces." Journal of the Australian Mathematical Society. Series A. Pure Mathematics and Statistics 46, no. 1 (February 1989): 88–99. http://dx.doi.org/10.1017/s1446788700030391.

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AbstractProbabilistic quasi-metric spaces are introduced and used to define ordered probabilistic metric spaces. The latter spaces arise naturally in the study of probability and statistics; they closely resemble the uniform ordered spaces of L. Nachbin. A procedure is described for constructing ordered probabilistic metric spaces from quasi-simple spaces, and a completions theory is developed simultaneously for probabilistic quasi-metric spaces and ordered probabilistic metric spaces.

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17

Pereira, Clóvis. "LEOPOLDO NACHBIN, UM EXCELENTE MATEMÁTICO BRASILEIRO DO SÉCULO XX." Revista Brasileira de História da Matemática 17, no. 34 (October 24, 2020): 73–81. http://dx.doi.org/10.47976/rbhm2017v17n3473-81.

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Neste artigo homenageamos o matemático brasileiro, Leopoldo Nachbin, que viveu no século XX. No texto abordamos, de modo sumário, além das mais relevantes pesquisas científicas do homenageado, sua decisiva contribuição para a criação de normas administrativas legais que induzissem a formação de recursos humanos qualificados em matemática. Como ideia subjacente, desejamos contribuir, de modo modesto, para a recuperação de uma parte da memória do saber nacional, isto é, a história da matemática no Brasil. Lamentamos profundamente o fato da não existência no país, de um amplo projeto que aborde, de modo sério, a recuperação e conservação do patrimônio matemático brasileiro.

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18

Kent, D. C., and T. A. Richmond. "A new ordered compactification." International Journal of Mathematics and Mathematical Sciences 16, no. 1 (1993): 117–24. http://dx.doi.org/10.1155/s0161171293000146.

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A new Wallman-type ordered compactificationγ∘Xis constructed using maximalCZ-filters (which have filter bases obtained from increasing and decreasing zero sets) as the underlying set. A necessary and sufficient condition is given forγ∘Xto coincide with the Nachbin compactificationβ∘X; in particularγ∘X=β∘XwheneverXhas the discrete order. The Wallman ordered compactificationω∘Xequalsγ∘XwheneverXis a subspace ofRn. It is shown thatγ∘Xis alwaysT1, but can fail to beT1-ordered orT2.

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19

PALACIOS, LOURDES, Pavel Ramos-Martinez, and Carlos Signoret. "On some properties of CV_{(0)}(X, A)." Acta et Commentationes Universitatis Tartuensis de Mathematica 26, no. 2 (November 23, 2022): 219–31. http://dx.doi.org/10.12697/acutm.2022.26.15.

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Let X be a completely regular Hausdorff space and V a Nachbin familyon X. For a locally convex algebra A, let CV(0)(X, A) be the algebra ofall weighted vector-valued continuous functions with the topology givenby the uniform seminorms induced by V . In this paper we study someproperties of A that are inherited by CV(0)(X, A). These properties arerelated to the unit element, spectral seminorms and uniformly A-convexproperty

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20

Roth, Walter. "A Korovkin type theorem for weighted spaces of continuous functions." Bulletin of the Australian Mathematical Society 55, no. 2 (April 1997): 239–48. http://dx.doi.org/10.1017/s0004972700033906.

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We prove a Korovkin type approximation theorem for positive linear operators on weighted spaces of continuous real-valued functions on a compact Hausdorff space X. These spaces comprise a variety of subspaces of C (X) with suitable locally convex topologies and were introduced by Nachbin 1967 and Prolla 1977. Some early Korovkin type results on the weighted approximation of real-valued functions in one and several variables with a single weight function are due to Gadzhiev 1976 and 1980.

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21

Khan, Liaqat Ali. "On approximation in weighted spaces of continuous vector-valued functions." Glasgow Mathematical Journal 29, no. 1 (January 1987): 65–68. http://dx.doi.org/10.1017/s0017089500006662.

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The fundamental work on approximation in weighted spaces of continuous functions on a completely regular space has been done mainly by Nachbin ([5], [6]). Further investigations have been made by Summers [10], Prolla ([7], [8]), and other authors (see the monograph [8] for more references). These authors considered functions with range contained in the scalar field or a locally convex topological vector space. In the present paper we prove some approximation results without local convexity of the range space.

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22

Ansemil, José M., and Socorro Ponte. "Metrizability of spaces of holomorphic functions with the Nachbin topology." Journal of Mathematical Analysis and Applications 334, no. 2 (October 2007): 1146–51. http://dx.doi.org/10.1016/j.jmaa.2007.01.012.

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23

Mukhamadiev, Farkhod Gafurjanovich. "Hewitt-Nachbin number of the space of thin complete linked systems." Итоги науки и техники Серия «Современная математика и ее приложения Тематические обзоры» 197 (2021): 95–100. http://dx.doi.org/10.36535/0233-6723-2021-197-95-100.

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24

Dias, André Luís Mattedi. "O Instituto de Matemática e Física da Universidade da Bahia: atividades matemáticas (1960-1968)." História, Ciências, Saúde-Manguinhos 15, no. 4 (December 2008): 1049–75. http://dx.doi.org/10.1590/s0104-59702008000400010.

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Analisa o processo de implantação de Instituto de Matemática e Física da Universidade da Bahia entre 1960 e 1968. Enfatiza os diversos interesses, representações, articulações, convencimentos e conflitos que envolveram os participantes do processo. Por um lado, o projeto inicial de Martha Dantas, Arlete Cerqueira Lima e Ramiro Porto Alegre, patrocinado pelo reitor Edgard Santos e encampado por Rubens Lintz, Omar Catunda e Leopoldo Nachbin, foi contestado pelos catedráticos da Escola Politécnica, representados por Bautista Vidal; por outro, os estudantes da Escola Politécnica não seguiram as atividades de iniciação científica desenvolvidas no Instituto, que só despertaram o interesse de estudantes oriundas da Faculdade de Filosofia.

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25

Khan, L. A., and A. B. Thaheem. "Multiplication operators on weighted spaces in the non-locally convex framework." International Journal of Mathematics and Mathematical Sciences 20, no. 1 (1997): 75–79. http://dx.doi.org/10.1155/s0161171297000112.

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LetXbe a completely regular Hausdorff space,Ea topological vector space,Va Nachbin family of weights onX, andCV0(X,E)the weighted space of continuousE-valued functions onX. Letθ:X→Cbe a mapping,f∈CV0(X,E)and defineMθ(f)=θf(pointwise). In caseEis a topological algebra,ψ:X→Eis a mapping then defineMψ(f)=ψf(pointwise). The main purpose of this paper is to give necessary and sufficient conditions forMθandMψto be the multiplication operators onCV0(X,E)whereEis a general topological space (or a suitable topological algebra) which is not necessarily locally convex. These results generalize recent work of Singh and Manhas based on the assumption thatEis locally convex.

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26

Nachbin, A., and R. Ribeiro-Junior. "Capturing the flow beneath water waves." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 376, no. 2111 (December 11, 2017): 20170098. http://dx.doi.org/10.1098/rsta.2017.0098.

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Recently, the authors presented two numerical studies for capturing the flow structure beneath water waves (Nachbin and Ribeiro-Junior 2014 Disc. Cont. Dyn. Syst. A 34 , 3135–3153 ( doi:10.3934/dcds.2014.34.3135 ); Ribeiro-Junior et al. 2017 J. Fluid Mech. 812 , 792–814 ( doi:10.1017/jfm.2016.820 )). Closed orbits for irrotational waves with an opposing current and stagnation points for rotational waves were some of the issues addressed. This paper summarizes the numerical strategies adopted for capturing the flow beneath irrotational and rotational water waves. It also presents new preliminary results for particle trajectories, due to irrotational waves, in the presence of a bottom topography. This article is part of the theme issue ‘Nonlinear water waves’.

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Ansemil, J. M., and S. Ponte. "The compact open and the Nachbin ported topologies on spaces of holomorphic functions." Archiv der Mathematik 51, no. 1 (July 1988): 65–70. http://dx.doi.org/10.1007/bf01194156.

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28

Nachbin, André. "The localization length of randomly scattered water waves." Journal of Fluid Mechanics 296 (August 10, 1995): 353–72. http://dx.doi.org/10.1017/s0022112095002151.

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A theory for the reflection-transmission problem of linear water waves in shallow channels with large-amplitude, rapidly varying topographies is given in Nachbin & Papanicolaou (1992b). However, it is very difficult to extract quantitative information from the theory in the large-amplitude regime. In this work, theoretical parameters are evaluated numerically, through the use of a numerical Schwarz–Christoffel transformation and of a Monte Carlo simulation. This enables the theory to be applied to its full extent. As a result we calculate the localization length for any given type of random bottom topography. Additionally, the numerical conformal mapping provides further insight into depth effects arising from potential theory. Statistical results, for numerically generated reflected waves, are in very good agreement with the theory for both piecewise-linear and piecewise-constant topographies of large amplitude.

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29

Nawrocki, Marek. "On weak approximation and convexification in weighted spaces of vector-valued continuous functions." Glasgow Mathematical Journal 31, no. 1 (January 1989): 59–64. http://dx.doi.org/10.1017/s0017089500007540.

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Let X be a completely regular Hausdorff space. A Nachbin family of weights is a set V of upper-semicontinuous positive functions on X such that if u, υ ∈ V then there exists w ∈ V and t > 0 so that u, υ ≤ tw. For any Hausdorff topological vector space E, the weighted space CV0(X, E) is the space of all E-valued continuous functions f on X such that υf vanishes at infinity for all υ ∈ V. CV0(X, E) is equipped with the weighted topologywv = wv(X, E) which has as a base of neighbourhoods of zero the family of all sets of the formwhere υ ∈ Vand W is a neighbourhood of zero in E. If E is the scalar field, then the space CV0(X, E) is denoted by CV0(X). The reader is referred to [4, 6, 8] for information on weighted spaces.

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30

Silva, Circe Mary Silva da. "Formação de professores e pesquisadores de matemática na faculdade nacional de filosofia." Cadernos de Pesquisa, no. 117 (November 2002): 103–26. http://dx.doi.org/10.1590/s0100-15742002000300006.

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O objetivo deste artigo é contribuir para o conhecimento da história da formação de professores e pesquisadores de Matemática na Faculdade Nacional de Filosofia - FNFi. Descreve-se o processo de negociação para a escolha de professores estrangeiros para atuar no curso de Matemática, bem como a proposta curricular; identificam-se os primeiros alunos e discute-se a formação pedagógica do futuro professor. Mostram-se as dificuldades enfrentadas durante a Segunda Guerra Mundial, pelos matemáticos estrangeiros, bem como analisa-se a contribuição de alguns desses matemáticos para o desenvolvimento da pesquisa no país. Identificam-se os primeiros brasileiros, José Abdelhay e Leopoldo Nachbin, que tiveram um papel relevante no ensino e pesquisa matemática, nos anos iniciais do surgimento do cursos de bacharelado e licenciatura em Matemática na FNFi. O período analisado vai da criação da FNFi (1939) e estende-se até meados de 1950, quando começam os embates pela disputa de espaço acadêmico na área de Matemática.

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Mariano Sales, Glaucilene. "Disseminação Seletiva da Informação:." Biblionline 16, no. 2 (October 29, 2020): 65–68. http://dx.doi.org/10.22478/ufpb.1809-4775.2020v16n2.46448.

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Este trabalho apresenta um estudo realizado na Biblioteca Leopoldo Nachbin do Instituto de Matemática da Universidade Federal do Rio de Janeiro, sobre o serviço de disseminação seletiva da informação relacionada ao acervo de História da Matemática. Por meio de uma pesquisa aplicada de abordagem quali-quantitativa, foi realizada uma busca na Base Minerva a fim de selecionar as obras pertinentes à temática. Os objetivos deste estudo foram analisar e divulgar as obras que são importantes para a História da Matemática, a fim de promover seu uso por parte dos professores e pesquisadores da área. O Instituto de Matemática possui algumas disciplinas relacionadas à Evolução da Matemática e este estudo contribuiu não somente para servir de base referencial para esta disciplina, mas também para os pesquisadores no tema. Portanto, este trabalho nos ajudou a ressaltar a importância deste acervo para a biblioteca do Instituto de Matemática e nos trouxe a experiência para realizar outras pesquisas do mesmo cunho.

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32

Grabowski, Adam. "Prime Filters and Ideals in Distributive Lattices." Formalized Mathematics 21, no. 3 (October 1, 2013): 213–21. http://dx.doi.org/10.2478/forma-2013-0023.

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Summary. The article continues the formalization of the lattice theory (as structures with two binary operations, not in terms of ordering relations). In the Mizar Mathematical Library, there are some attempts to formalize prime ideals and filters; one series of articles written as decoding [9] proven some results; we tried however to follow [21], [12], and [13]. All three were devoted to the Stone representation theorem [18] for Boolean or Heyting lattices. The main aim of the present article was to bridge this gap between general distributive lattices and Boolean algebras, having in mind that the more general approach will eventually replace the common proof of aforementioned articles.1 Because in Boolean algebras the notions of ultrafilters, prime filters and maximal filters coincide, we decided to construct some concrete examples of ultrafilters in nontrivial Boolean lattice. We proved also the Prime Ideal Theorem not as BPI (Boolean Prime Ideal), but in the more general setting. In the final section we present Nachbin theorems [15],[1] expressed both in terms of maximal and prime filters and as the unordered spectra of a lattice [11], [10]. This shows that if the notion of maximal and prime filters coincide in the lattice, it is Boolean.

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Barany, Michael J. "Fellow Travelers and Traveling Fellows." Historical Studies in the Natural Sciences 46, no. 5 (November 1, 2016): 669–709. http://dx.doi.org/10.1525/hsns.2016.46.5.669.

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The geographic reach and international integration of modern mathematics expanded dramatically in the wake of the Second World War. I examine the political and logistical achievement of intercontinental mathematics in this period by following the travels of José Luis Massera of Uruguay, Leopoldo Nachbin of Brazil, and Laurent Schwartz of France. The interlocking efforts of mathematicians and bureaucrats in universities, governments, philanthropies, and new postwar formations like the United Nations Educational, Scientific and Cultural Organization to build mathematical institutions in Latin America operated with partial information, competing prerogatives, and costly exchanges of materials and personnel, each of which reflected the shifting economic and political constraints of the global Cold War. Drawing primarily on fellowship files and institutional archives, I situate these undertakings in the mechanics and ideals of twentieth-century scientific colonialism, development, and modernization. I explain how the seemingly nontechnical bases for such exchanges related to the specific mathematics being taught and researched by accounting for the particular success of Schwartz’s theory of distributions in Latin America, which owed both to circumstantial coincidences and to a mixture of several of the theory’s superficial, technical, and conceptual features. My analysis stresses the complex, ambivalent, but nonetheless consequential personal and institutional negotiations underwriting midcentury intercontinental mathematics while pointing to the importance of such phenomena for explaining the form and effects of the period’s broader array of global scientific exchanges.

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Bagchi, Susmit. "Homotopy of Linearly Ordered Split–Join Chains in Covering Spaces of Foliated n-Manifold Charts." Symmetry 15, no. 3 (February 22, 2023): 574. http://dx.doi.org/10.3390/sym15030574.

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Topological spaces can be induced by various algebraic ordering relations such as, linear, partial and the inclusion-ordering of open sets forming chains and chain complexes. In general, the classifications of covering spaces are made by using fundamental groups and lifting. However, the Riesz ordered n-spaces and Urysohn interpretations of real-valued continuous functions as ordered chains provide new perspectives. This paper proposes the formulation of covering spaces of n-space charts of a foliated n-manifold containing linearly ordered chains, where the chains do not form topologically separated components within a covering section. The chained subspaces within covering spaces are subjected to algebraic split–join operations under a bijective function within chain-subspaces to form simply directed chains and twisted chains. The resulting sets of chains form simply directed chain-paths and oriented chain-paths under the homotopy path-products involving the bijective function. It is shown that the resulting embedding of any chain in a leaf of foliated n-manifold is homogeneous and unique. The finite measures of topological subspaces containing homotopies of chain-paths in covering spaces generate multiplicative and cyclic group varieties of different orders depending upon the types of measures. As a distinction, the proposed homotopies of chain-paths in covering spaces and the homogeneous chain embedding in a foliated n-manifold do not consider the formation of circular nerves and the Nachbin topological preordering, thereby avoiding symmetry/asymmetry conditions.

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Ryzhakova, S., and S. Bandyopadhyay. "Nachnis and Rasiks: An Ethnographic Study of an Artistic Community of Purulia District, West Bengal." Вестник антропологии (Herald of Anthropology), no. 2022 № 1 (2022): 117–33. http://dx.doi.org/10.33876/2311-0546/2022-1/117-133.

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This paper is based on the study of nachnis, a dancing community in Purulia district of West Bengal, India. The community is still performing albeit in a different form than that has so far been projected in the popular perception and is very different from its past composition and practices. Preserving to some extent the traditional features of jajmani system, danseuses are mostly involved in the local entertainment sphere. In spite of the profound changes in the attitude to dance and music in India in general, nachnis' social status is still very low. A nachni is always involved in a dynamic relationship with her rasik – a man who fulfills functions of her teacher, manager, patron, lover, and often her children's father. There is a tendency towards forming stable family-like connections between a nachni and a rasik today. Although there is certain activity to unite all nachnis and promote their rights, this initiative is still unsuccessful due to strong professional rivalry and a lack of community feeling. The content of nachnis' dance repertoire demonstrates a blend of various styles, traditions, arranged in local ways and fitted for the popular taste of the audience. Статья посвящена этнографическому исследованию начни – небольшому артистическому сообществу района Пурулиа штата Западная Бенгалия, Индия. Это женщины, выступающие в сопровождении музыкантов-аккомпаниаторов на публике: на сельских праздниках, по индивидуальным и коллективным приглашениям. Они были ранее включены в систему традиционного кастового обмена услугами, джаджмани, исполняли песни и танцы направления джумур, а в настоящее время в основном вовлечены в местную развлекательную сферу. Их социальный статус очень низок. Начни всегда находится в постоянных и динамических отношениях со своим расиком – человеком, выполняющим целый ряд функций: учителя, менеджера, покровителя, любовника, нередко и отца ее детей. Сегодня наблюдается тенденция к формированию устойчивых семейных связей между начни и расиком. Хотя с 2005 г. начала проводиться некоторая деятельность по объединению всех начни и продвижению их прав, эта инициатива не получила успеха из-за сильного профессионального соперничества и отсутствия между танцовщицами чувства общности. Содержание танцевального репертуара начни демонстрирует эклектичное смешение различных стилей, отвечающих популярным вкусам публики, но в редких случаях отдельные талантливые артистки добиваются определенного признания и образованной аудитории.

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Sengupta, Saloka, and Haripriya Narasimhan. "Ki sambandha hoibe takhon he?: Locating Nachnis in the Societal Margins of Kinship in Rural Bengal." Indian Journal of Gender Studies 27, no. 2 (June 2020): 282–301. http://dx.doi.org/10.1177/0971521520910970.

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Na_chni na_ch, a dance form of West Bengal, is going through a difficult time in its 500-year history. The woman dancer, who is known as a nachni, performs, often at night, along with her male partner, or rasik. Her life is intricately tied with that of her rasik, which includes her status as a woman performer at public events and the observance of proper rituals upon her death. Caught in a web of exploitation, the nachni essentially has no ‘kin’. Following the work by Inden and Nicholas on Bengali kinship and its categories and meanings within Bengali culture, this article looks at the amorphous pattern of kinship for the marginalized, with a special focus on the daily lives of nachnis. It explores the networks on the margins of kinship in which women performers of this crisis-ridden folk-art form survive.

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Defant, Andreas, and Manuel Maestre. "Property (BB) and holomorphic functions on Fréchet-Montel spaces." Mathematical Proceedings of the Cambridge Philosophical Society 115, no. 2 (March 1994): 305–13. http://dx.doi.org/10.1017/s0305004100072108.

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Two of the most important topologies on the space ℋ(E) of all holomorphic functions f:E → ℂ on a complex locally convex space E are the compact-open topology τ0 and the Nachbin-ported topology τε. We recall that a seminorm p on ℋ(E) is said to be τω-continuous if there is a compact K such that for every open set V with K contained in V there is a constant c > 0 satisfyingClearly, the following natural question arises: when do the topologies τ0 and τω coincide? In the setting of Fréchet spaces equality of τ0 and τω forces E to be a Montel space; Mujica [21] proved τ0 = τω for Fréchet-Schwartz spaces and Ansemil-Ponte [1] showed that for Fréchet-Montel spaces this happens if and only if the space of all continuous n-homogeneous polynomials with the compact-open topology, (Pn(E), τ0), is barrelled. By duality, it turns out that the question τ0 = τω is intimately related to ‘Grothendieck's problème des topologies’ which asks whether or not for two Fréchet spaces E1 and E2 each bounded set B of the (completed) projective tensor product is contained in the closed absolutely convex hull of the set B1 ⊗ B2, where Bk is a bounded subset of Ek for k = 1, 2. If this is the case, then the pair (E1, E2) is said to have property (BB). Observe that every compact set B in can always be lifted by compact subsets Bk of Ek (see e.g. [20], 15·6·3). Hence, for Fréchet-Montel spaces E1 and E2, property (BB) of (El,E2) means that is Fréchet-Montel and vice versa. Taskinen[24] found the first counterexample to Grothendieck's problem. In [25] he constructed a Fréchet-Montel space E0 for which (E0,E0) does not have property (BB), and Ansemil-Taskinen [2] showed that τ0 ≠ τω on ℋ(E0).

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Gao, Shuai, William C. Valinsky, Nguyen Cam On, Patrick R. Houlihan, Qian Qu, Lei Liu, Xiaojing Pan, David E. Clapham, and Nieng Yan. "Employing NaChBac for cryo-EM analysis of toxin action on voltage-gated Na+channels in nanodisc." Proceedings of the National Academy of Sciences 117, no. 25 (June 8, 2020): 14187–93. http://dx.doi.org/10.1073/pnas.1922903117.

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NaChBac, the first bacterial voltage-gated Na+(Nav) channel to be characterized, has been the prokaryotic prototype for studying the structure–function relationship of Navchannels. Discovered nearly two decades ago, the structure of NaChBac has not been determined. Here we present the single particle electron cryomicroscopy (cryo-EM) analysis of NaChBac in both detergent micelles and nanodiscs. Under both conditions, the conformation of NaChBac is nearly identical to that of the potentially inactivated NavAb. Determining the structure of NaChBac in nanodiscs enabled us to examine gating modifier toxins (GMTs) of Navchannels in lipid bilayers. To study GMTs in mammalian Navchannels, we generated a chimera in which the extracellular fragment of the S3 and S4 segments in the second voltage-sensing domain from Nav1.7 replaced the corresponding sequence in NaChBac. Cryo-EM structures of the nanodisc-embedded chimera alone and in complex with HuwenToxin IV (HWTX-IV) were determined to 3.5 and 3.2 Å resolutions, respectively. Compared to the structure of HWTX-IV–bound human Nav1.7, which was obtained at an overall resolution of 3.2 Å, the local resolution of the toxin has been improved from ∼6 to ∼4 Å. This resolution enabled visualization of toxin docking. NaChBac can thus serve as a convenient surrogate for structural studies of the interactions between GMTs and Navchannels in a membrane environment.

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de Graaf, Nathalie, and Martijn Gijsbertsen. "Slapeloze nachten." Advocatenblad 102, no. 1 (February 2022): 48–53. http://dx.doi.org/10.5553/ab/0165-13312022102001018.

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Himmelsbach, Antonia. "Reformfreudige Nachbarn." physiopraxis 4, no. 07/08 (July 2006): 54–57. http://dx.doi.org/10.1055/s-0032-1308021.

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Seit dem 1. Janurar 2006 bestimmt eine neue Reform die Arbeit von Physiotherapeuten in den Niederlanden. Was sich durch die Umstrukturierung im Gesundheitssystem für Physiotherapeuten ändert und was die Niederlande außer Tulpen, Käse und berühmten Malern zu bieten haben, lesen Sie hier.

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de Vos, Rien. "Slapeloze nachten." Nederlands Tijdschrift voor Evidence Based Practice 12, no. 3 (July 2014): 24. http://dx.doi.org/10.1007/s12468-014-0030-x.

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Lee, Sora, Samuel J. Goodchild, and Christopher A. Ahern. "Local anesthetic inhibition of a bacterial sodium channel." Journal of General Physiology 139, no. 6 (May 28, 2012): 507–16. http://dx.doi.org/10.1085/jgp.201210779.

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Recent structural breakthroughs with the voltage-gated sodium channel from Arcobacter butzleri suggest that such bacterial channels may provide a structural platform to advance the understanding of eukaryotic sodium channel gating and pharmacology. We therefore set out to determine whether compounds known to interact with eukaryotic NaVs could also inhibit the bacterial channel from Bacillus halodurans and NaChBac and whether they did so through similar mechanisms as in their eukaryotic homologues. The data show that the archetypal local anesthetic (LA) lidocaine inhibits resting NaChBac channels with a dissociation constant (Kd) of 260 µM, and channels displayed a left-shifted steady-state inactivation gating relationship in the presence of the drug. Extracellular application of QX-314 to expressed NaChBac channels had no effect on sodium current, whereas internal exposure via injection of a bolus of the quaternary derivative rapidly reduced sodium conductance, consistent with a hydrophilic cytoplasmic access pathway to an internal binding site. However, the neutral derivative benzocaine applied externally inhibited NaChBac channels, suggesting that hydrophobic pathways can also provide drug access to inhibit channels. Alternatively, ranolazine, a putative preopen state blocker of eukaryotic NaVs, displayed a Kd of 60 µM and left-shifted the NaChBac activation-voltage relationship. In each case, block enhanced entry into the inactivated state of the channel, an effect that is well described by a simple kinetic scheme. The data suggest that although significant differences exist, LA block of eukaryotic NaVs also occurs in bacterial sodium channels and that NaChBac shares pharmacological homology to the resting state of vertebrate NaV homologues.

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Wang, Yali, Elaine Yang, Marta M. Wells, Vasyl Bondarenko, Kellie Woll, Vincenzo Carnevale, Daniele Granata, et al. "Propofol inhibits the voltage-gated sodium channel NaChBac at multiple sites." Journal of General Physiology 150, no. 9 (July 17, 2018): 1317–31. http://dx.doi.org/10.1085/jgp.201811993.

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Voltage-gated sodium (NaV) channels are important targets of general anesthetics, including the intravenous anesthetic propofol. Electrophysiology studies on the prokaryotic NaV channel NaChBac have demonstrated that propofol promotes channel activation and accelerates activation-coupled inactivation, but the molecular mechanisms of these effects are unclear. Here, guided by computational docking and molecular dynamics simulations, we predict several propofol-binding sites in NaChBac. We then strategically place small fluorinated probes at these putative binding sites and experimentally quantify the interaction strengths with a fluorinated propofol analogue, 4-fluoropropofol. In vitro and in vivo measurements show that 4-fluoropropofol and propofol have similar effects on NaChBac function and nearly identical anesthetizing effects on tadpole mobility. Using quantitative analysis by 19F-NMR saturation transfer difference spectroscopy, we reveal strong intermolecular cross-relaxation rate constants between 4-fluoropropofol and four different regions of NaChBac, including the activation gate and selectivity filter in the pore, the voltage sensing domain, and the S4–S5 linker. Unlike volatile anesthetics, 4-fluoropropofol does not bind to the extracellular interface of the pore domain. Collectively, our results show that propofol inhibits NaChBac at multiple sites, likely with distinct modes of action. This study provides a molecular basis for understanding the net inhibitory action of propofol on NaV channels.

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Kuzmenkin, Alexey, Francisco Bezanilla, and Ana M. Correa. "Gating of the Bacterial Sodium Channel, NaChBac." Journal of General Physiology 124, no. 4 (September 13, 2004): 349–56. http://dx.doi.org/10.1085/jgp.200409139.

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The bacterial sodium channel, NaChBac, from Bacillus halodurans provides an excellent model to study structure–function relationships of voltage-gated ion channels. It can be expressed in mammalian cells for functional studies as well as in bacterial cultures as starting material for protein purification for fine biochemical and biophysical studies. Macroscopic functional properties of NaChBac have been described previously (Ren, D., B. Navarro, H. Xu, L. Yue, Q. Shi, and D.E. Clapham. 2001. Science. 294:2372–2375). In this study, we report gating current properties of NaChBac expressed in COS-1 cells. Upon depolarization of the membrane, gating currents appeared as upward inflections preceding the ionic currents. Gating currents were detectable at −90 mV while holding at −150 mV. Charge–voltage (Q–V) curves showed sigmoidal dependence on voltage with gating charge saturating at −10 mV. Charge movement was shifted by −22 mV relative to the conductance–voltage curve, indicating the presence of more than one closed state. Consistent with this was the Cole-Moore shift of 533 μs observed for a change in preconditioning voltage from −160 to −80 mV. The total gating charge was estimated to be 16 elementary charges per channel. Charge immobilization caused by prolonged depolarization was also observed; Q–V curves were shifted by approximately −60 mV to hyperpolarized potentials when cells were held at 0 mV. The kinetic properties of NaChBac were simulated by simultaneous fit of sodium currents at various voltages to a sequential kinetic model. Gating current kinetics predicted from ionic current experiments resembled the experimental data, indicating that gating currents are coupled to activation of NaChBac and confirming the assertion that this channel undergoes several transitions between closed states before channel opening. The results indicate that NaChBac has several closed states with voltage-dependent transitions between them realized by translocation of gating charge that causes activation of the channel.

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Lang, Kai-Olaf. "Nachbarn in Alarm." osteuropa 70, no. 10-11 (2020): 305. http://dx.doi.org/10.35998/oe-2020-0082.

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Burger, Claudia. "Ingenieurabschluss beim Nachbarn." VDI nachrichten 75, no. 50-51-52 (2021): 29. http://dx.doi.org/10.51202/0042-1758-2021-50-51-52-29.

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Marzinzik, Frank, and Arnim Quante. "Vom Nachbarn bestrahlt." NeuroTransmitter 22, no. 6 (June 2011): 38–43. http://dx.doi.org/10.1007/bf03363539.

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Breuer, Edward, and Jay M. Harris. "Harris, "Nachman Krochmal"." Jewish Quarterly Review 85, no. 3/4 (January 1995): 419. http://dx.doi.org/10.2307/1454727.

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Hatscher, Deike. "Rätselhaftes vom Nachbarn." Chemie in unserer Zeit 46, no. 3 (June 2012): 194. http://dx.doi.org/10.1002/ciuz.201290037.

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Vaičiūnaitė-Guesdon, Jolanta. "Unbekannte bekannte Nachbarn." Zeitschrift für Literaturwissenschaft und Linguistik 33, no. 1 (March 2003): 5–7. http://dx.doi.org/10.1007/bf03379335.

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Journal articles on the topic 'Nachbin'

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