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Article
Publication date: 1 June 1994

Michael M. Grigor’ev

The paper gives the description of boundary element method(BEM) with subdomains for the solution ofconvection—diffusion equations with variable coefficients and Burgers’equations…

Abstract

The paper gives the description of boundary element method (BEM) with subdomains for the solution of convection—diffusion equations with variable coefficients and Burgers’ equations. At first, the whole domain is discretized into K subdomains, in which linearization of equations by representing convective velocity by the sum of constant and variable parts is carried out. Then using fundamental solutions for convection—diffusion linear equations for each subdomain the boundary integral equation (in which the part of the convective term with the constant convective velocity is not included into the pseudo‐body force) is formulated. Only part of the convective term with the variable velocity, which is, as a rule, more than one order less than convective velocity constant part contribution, is left as the pseudo‐source. On the one hand, this does not disturb the numerical BEM—algorithm stability and, on the other hand, this leads to significant improvement in the accuracy of solution. The global matrix, similar to the case of finite element method, has block band structure whereas its width depends only on the numeration order of nodes and subdomains. It is noted, that in comparison with the direct boundary element method the number of global matrix non‐zero elements is not proportional to the square of the number of nodes, but only to the total number of nodal points. This allows us to use the BEM for the solution of problems with very fine space discretization. The proposed BEM with subdomains technique has been used for the numerical solution of one‐dimensional linear steady‐state convective—diffusion problem with variable coefficients and one‐dimensional non‐linear Burgers’ equation for which exact analytical solutions are available. It made it possible to find out the BEM correctness according to both time and space. High precision of the numerical method is noted. The good point of the BEM is the high iteration convergence, which is disturbed neither by high Reynolds numbers nor by the presence of negative velocity zones.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 4 no. 6
Type: Research Article
ISSN: 0961-5539

Keywords

Article
Publication date: 1 January 1993

Gordon E. Hogg

Until very recently an immense USSR comprised fifteen republics. Now the three Baltic states are free of Moscow's direction, and an independent Ukraine has joined Belarus and the…

Abstract

Until very recently an immense USSR comprised fifteen republics. Now the three Baltic states are free of Moscow's direction, and an independent Ukraine has joined Belarus and the former Russian Soviet Federated Republic (RSFSR) as the hub in a commonwealth of former republics that have declared themselves independent or “sovereign,” but federated through agreements based on economics or defense considerations. Whether one concentrates on the story of Baltic freedom following the abortive 1991 coup, the subsequent dissolution of central governmental power, or the lasting enmities among some of the peoples in Central Asia and the Caucasus, the pivot around which this new interest or heightened curiosity turns is the recent great change within the late Union of Soviet Socialist Republics.

Details

Reference Services Review, vol. 21 no. 1
Type: Research Article
ISSN: 0090-7324

Article
Publication date: 21 October 2019

Farzad Zamani and Asma Mehan

The purpose of this paper is to explain how abstract space of the State – universally and specifically within the context of Middle Eastern cities – aims to homogenise the city…

Abstract

Purpose

The purpose of this paper is to explain how abstract space of the State – universally and specifically within the context of Middle Eastern cities – aims to homogenise the city and eliminate any anomaly that threatens its power structure.

Design/methodology/approach

Through a historical and discourse analysis of these policies and processes in the two case studies, this paper presents a contextualised reading of Lefebvre’s concept of abstract space and process of abstraction in relation to the alienation of political public spaces.

Findings

The paper proposes that regardless of these homogenising strategies being applied universally, they fail to respond to contextual particularities and therefore they – in a contradictory manner – may themselves produce a space of resistance and difference.

Originality/value

This paper focusses on Iran, the case of Tehran and Turkey, the case of Taksim Square and Gezi Park in Istanbul. Recent policies and strategies have been proposed and implemented to reduce, alienate and possibly neutralise the impacts of urban and political protests in these cities and socio-political contexts.

Details

Archnet-IJAR: International Journal of Architectural Research, vol. 13 no. 3
Type: Research Article
ISSN: 2631-6862

Keywords

Book part
Publication date: 16 May 2007

Boris N. Filatov, Valentina V. Klauchek, Nikolay G. Britanov and Sergei V. Klauchek

The world community has long striven for the liquidation of chemical weapons of mass destruction. The 1925 Geneva treaty “On the Prohibition of the Use in War of Asphyxiating…

Abstract

The world community has long striven for the liquidation of chemical weapons of mass destruction. The 1925 Geneva treaty “On the Prohibition of the Use in War of Asphyxiating, Poisonous or Other Gases, and of Bacterial Methods of Warfare” was the first international accord on chemical weapons prohibition. Signed by 125 countries, the USSR ratified the treaty in December 1927. The later development of the “Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and their Destruction” (henceforth “the Convention”) followed this early step and was undertaken with Russia's active participation. The Convention was signed by the Russian Federation in January 1993 and ratified by the State Duma in November 1997 with the decision to end chemical weapons stockpiling by 2007. As a signatory, Russia accepted international responsibilities for solving many interrelated problems, paramount among them was the protection of people and the environment (The Convention…, 1994, item 4).

Details

Cultures of Contamination
Type: Book
ISBN: 978-0-7623-1371-6

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