Depot location with rectilinear distances / Lakdere Benkherouf (1985) 

Public ISBD Titre : Depot location with rectilinear distances Type de document : texte imprimé Auteurs : Lakdere Benkherouf, Auteur ; C. D. T. Watson-Gandy, Directeur de thèse Editeur : University of London Année de publication : 1985 Importance : 51 f. Présentation : ill. Format : 27 cm. Note générale : Mémoire de Master : Management Science : Londre, University of London : 1985 Bibliogr. f. 52 - 55 . Annexe f. 56 - 66 Langues : Anglais (eng) Mots-clés : Weber's problem Rectilinear depot location Optimal location Index. décimale : Ms00285 Résumé : In weber's problem, which is concerned with finding the location of a firm with respect to its suppliers and its customers, one mostly uses Euclidean distances. In a continuous space, the assumption of rectilinear distances permits simpler methods of finding the optimum solutions. Sometimes, this assumption fits perfectly with reality. Generally, the approximation is not worse than that of the Euclidean assumption. In this report, methods of solving the rectilinear depot location are described. Also, the implication of rotating the axes on the optimal location is considered. A quadratic programming formulation of the problem was set as a means to solving such problems. The location when dealing with skew axes is also considered. Depot location with rectilinear distances [texte imprimé] / Lakdere Benkherouf, Auteur ; C. D. T. Watson-Gandy, Directeur de thèse . - University of London, 1985 . - 51 f. : ill. ; 27 cm. Mémoire de Master : Management Science : Londre, University of London : 1985 Bibliogr. f. 52 - 55 . Annexe f. 56 - 66 Langues : Anglais (eng) Mots-clés : Weber's problem Rectilinear depot location Optimal location Index. décimale : Ms00285 Résumé : In weber's problem, which is concerned with finding the location of a firm with respect to its suppliers and its customers, one mostly uses Euclidean distances. In a continuous space, the assumption of rectilinear distances permits simpler methods of finding the optimum solutions. Sometimes, this assumption fits perfectly with reality. Generally, the approximation is not worse than that of the Euclidean assumption. In this report, methods of solving the rectilinear depot location are described. Also, the implication of rotating the axes on the optimal location is considered. A quadratic programming formulation of the problem was set as a means to solving such problems. The location when dealing with skew axes is also considered.

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Dynamics of structures including fluid interaction / Abdelkrim Chelghoum (1986) 

Public ISBD Titre : Dynamics of structures including fluid interaction Type de document : texte imprimé Auteurs : Abdelkrim Chelghoum, Auteur ; Patrick Dowling, Directeur de thèse ; John Harding, Directeur de thèse Editeur : University of London Année de publication : 1986 Importance : 268 f. Présentation : ill. Format : 27 cm. Note générale : Thèse de Doctorat : Génie Civil : Londres, Université de Londres : 1986 Bibliogr. f. 270 - 299 . - Annexe f. 301 - 324 Langues : Anglais (eng) Mots-clés : Dynamics of structures Fluid-structure systems Vibration analysis Seismic analysis Finite element method Non-linear dynamic methods Finite Index. décimale : D002686 Résumé : This thesis investigates the non-linear behaviour of fluid-structure systems with particular emphasis on the vibration and seismic analysis of ground-supported cylindrical liquid filled shells. A numerical approach based mainly on the finite element has been formulated. Three main developments are reported: 1/ Formulation and implementation of non-linear dynamic methods. The derived finite element incremental equations of motion have been solved by a combined "time integration-iterative scheme" approach. Both implicit and explicit temporal integration methods have been used. In the former approach, the Newmark's and Wilson's schemes have been reviewed and implemented. In the latter, the central difference operator was selected. Non-linear iterative schemes based on both the full and modified Newton-Raphson approaches have been included. Various structural problems analysed in both linear and non-linear domains have demonstrated the newly developed method. The efficiency and accuracy of the present study have been proved by correlation with available analytical and numerical results. 2/ Two and three dimensional displacement based fluid elements have been formulated including large displacement effects, introduced through the quadratic terms in the Almansi strain tensor. The "Updated Lagrangian" description of motion has been used. The main purpose of these elements is to model a contained inviscid fluid medium with no net flow rate or gross fluid motion. 3/ A four noded interface element linking the fluid and structural nodes has been produced. Various analyses of fluid-structure dynamic interaction systems have been investigated including a complete free vibration analysis of fluid storage tanls. Also, a general 3-D seismic response of cylindrical liquid storage shells has been carried out. Finally the modelling of the free surface sloshing effects has been addressed. The thesis contains illustrative examples to demonstrate the capability and accuracy of the newly developed procedures. Dynamics of structures including fluid interaction [texte imprimé] / Abdelkrim Chelghoum, Auteur ; Patrick Dowling, Directeur de thèse ; John Harding, Directeur de thèse . - University of London, 1986 . - 268 f. : ill. ; 27 cm. Thèse de Doctorat : Génie Civil : Londres, Université de Londres : 1986 Bibliogr. f. 270 - 299 . - Annexe f. 301 - 324 Langues : Anglais (eng) Mots-clés : Dynamics of structures Fluid-structure systems Vibration analysis Seismic analysis Finite element method Non-linear dynamic methods Finite Index. décimale : D002686 Résumé : This thesis investigates the non-linear behaviour of fluid-structure systems with particular emphasis on the vibration and seismic analysis of ground-supported cylindrical liquid filled shells. A numerical approach based mainly on the finite element has been formulated. Three main developments are reported: 1/ Formulation and implementation of non-linear dynamic methods. The derived finite element incremental equations of motion have been solved by a combined "time integration-iterative scheme" approach. Both implicit and explicit temporal integration methods have been used. In the former approach, the Newmark's and Wilson's schemes have been reviewed and implemented. In the latter, the central difference operator was selected. Non-linear iterative schemes based on both the full and modified Newton-Raphson approaches have been included. Various structural problems analysed in both linear and non-linear domains have demonstrated the newly developed method. The efficiency and accuracy of the present study have been proved by correlation with available analytical and numerical results. 2/ Two and three dimensional displacement based fluid elements have been formulated including large displacement effects, introduced through the quadratic terms in the Almansi strain tensor. The "Updated Lagrangian" description of motion has been used. The main purpose of these elements is to model a contained inviscid fluid medium with no net flow rate or gross fluid motion. 3/ A four noded interface element linking the fluid and structural nodes has been produced. Various analyses of fluid-structure dynamic interaction systems have been investigated including a complete free vibration analysis of fluid storage tanls. Also, a general 3-D seismic response of cylindrical liquid storage shells has been carried out. Finally the modelling of the free surface sloshing effects has been addressed. The thesis contains illustrative examples to demonstrate the capability and accuracy of the newly developed procedures.

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Excess volumes and enthalpies as chiral discriminants in liquids / Zadjia Atik (1982) 

Public ISBD Titre : Excess volumes and enthalpies as chiral discriminants in liquids Type de document : texte imprimé Auteurs : Zadjia Atik, Auteur ; M. L. McGlashan, Directeur de thèse Editeur : University of London Année de publication : 1982 Importance : 160 f. Présentation : ill. Format : 30 cm Note générale : Thèse de Doctorat : Génie Chimique : Angleterre, University of London : 1982 Bibliogr. f. 161 - 167 . - Annexe [15] f Langues : Anglais (eng) Mots-clés : Chiral discrimination Method dilatometric Method calorimetric Smoothing equation Index. décimale : D004182 Résumé : Chiral discrimination in liquids has been studied using dilatometric and calorimetric methods. Continuous dilution dilatometry has been used to determine chiral discrimination by measuring the excess molar volumes Vᴱm of mixtures of the (+) and (-) enantiomers of limonene, fenchone, and α-methylbenzylamine at temperatures close to 3000 K and pressures close to 100 kPa. The experimental results have been fitted to a smoothing equation, where x is the mole fraction of (-) enantiomer. The smoothing equation contains only even powers of (1 - 2x), aquivalent to assuming that the effect of optical impurities on Vᴱm is negligible. Small but definite chiral discrimination has been revealed in Vᴱm, where the corresponding values of Vᴱm are all very small and negative. Continuous dilution calorimetry has been used to determine chiral discrimination by measuring the excess molar enthalpies Hᴱm of mixtures of the (+) and (-) enantiomers of fenchone and α-methylbenzylamine at temperatures close to 313 K and pressures close to 100 kPa. The experimental results have been fitted to a smoothing equation. The smoothing equation has been allowed to contain odd powers of (1 - 2x), when these are statistically significant, so as to take account of a possible effect of optical impurities on Hᴱm. Chiral discrimination has also been revealed in Hᴱm. For mixtures of fenchones Hᴱm is very small and negative, whereas for mixtures of α-methylbenzylamines Hᴱm though very small is positive. The magnitudes and signs of such chiral discriminations form a stimulating challenge to theoreticians. Excess volumes and enthalpies as chiral discriminants in liquids [texte imprimé] / Zadjia Atik, Auteur ; M. L. McGlashan, Directeur de thèse . - University of London, 1982 . - 160 f. : ill. ; 30 cm. Thèse de Doctorat : Génie Chimique : Angleterre, University of London : 1982 Bibliogr. f. 161 - 167 . - Annexe [15] f Langues : Anglais (eng) Mots-clés : Chiral discrimination Method dilatometric Method calorimetric Smoothing equation Index. décimale : D004182 Résumé : Chiral discrimination in liquids has been studied using dilatometric and calorimetric methods. Continuous dilution dilatometry has been used to determine chiral discrimination by measuring the excess molar volumes Vᴱm of mixtures of the (+) and (-) enantiomers of limonene, fenchone, and α-methylbenzylamine at temperatures close to 3000 K and pressures close to 100 kPa. The experimental results have been fitted to a smoothing equation, where x is the mole fraction of (-) enantiomer. The smoothing equation contains only even powers of (1 - 2x), aquivalent to assuming that the effect of optical impurities on Vᴱm is negligible. Small but definite chiral discrimination has been revealed in Vᴱm, where the corresponding values of Vᴱm are all very small and negative. Continuous dilution calorimetry has been used to determine chiral discrimination by measuring the excess molar enthalpies Hᴱm of mixtures of the (+) and (-) enantiomers of fenchone and α-methylbenzylamine at temperatures close to 313 K and pressures close to 100 kPa. The experimental results have been fitted to a smoothing equation. The smoothing equation has been allowed to contain odd powers of (1 - 2x), when these are statistically significant, so as to take account of a possible effect of optical impurities on Hᴱm. Chiral discrimination has also been revealed in Hᴱm. For mixtures of fenchones Hᴱm is very small and negative, whereas for mixtures of α-methylbenzylamines Hᴱm though very small is positive. The magnitudes and signs of such chiral discriminations form a stimulating challenge to theoreticians.

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