Documents disponibles chez cet éditeur

The computation of turbulent surface wakes / Bellil, Mohamed 

Public ISBD Titre : The computation of turbulent surface wakes Type de document : texte imprimé Auteurs : Bellil, Mohamed, Auteur ; Launder, B.E., Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1991 Importance : 81 f. Présentation : ill. Format : 30 cm. Note générale : Master of science : Mechanical engineering : University of Manchester : 1991 Bibliogr. f. 82 - 89 Langues : Anglais (eng) Mots-clés : Mechanical  --  model  ;  Mechanical  solution  procedure Index. décimale : M003891 Résumé : The dissertation reports a numerical study of the surface wake using two turbulence models, namely: the standard K-ε model and Rodi's ASM model. The computed data were used to compare the performance of these models to predict the LDA surface wake data measured by Casteleyn (1990). The mean velocity field is reasonably predicted by the two models. On the other hand the normal reynolds stresses in the near field are underpredicted by the two models. In the far field the streamwise stress is quite well predicted by the ASM model. Also the K-ε model is in close agreement with the LDA measurements. However, the cross-stream normal stresses are underpredicted by the two models. The ASM model performs comparatively well in the normal stress field. Finally, the spreading rate parameter is underestimated by both turbulence models. The computation of turbulent surface wakes [texte imprimé] / Bellil, Mohamed, Auteur ; Launder, B.E., Directeur de thèse . - Manchester : [s.n.], 1991 . - 81 f. : ill. ; 30 cm. Master of science : Mechanical engineering : University of Manchester : 1991 Bibliogr. f. 82 - 89 Langues : Anglais (eng) Mots-clés : Mechanical  --  model  ;  Mechanical  solution  procedure Index. décimale : M003891 Résumé : The dissertation reports a numerical study of the surface wake using two turbulence models, namely: the standard K-ε model and Rodi's ASM model. The computed data were used to compare the performance of these models to predict the LDA surface wake data measured by Casteleyn (1990). The mean velocity field is reasonably predicted by the two models. On the other hand the normal reynolds stresses in the near field are underpredicted by the two models. In the far field the streamwise stress is quite well predicted by the ASM model. Also the K-ε model is in close agreement with the LDA measurements. However, the cross-stream normal stresses are underpredicted by the two models. The ASM model performs comparatively well in the normal stress field. Finally, the spreading rate parameter is underestimated by both turbulence models.

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Phase equilibria in very dilute mixtures of water and halogenated hydrocarbons / Brahim Khalfaoui 

Public ISBD Titre : Phase equilibria in very dilute mixtures of water and halogenated hydrocarbons Type de document : texte imprimé Auteurs : Brahim Khalfaoui, Auteur ; D. M. T. Newsham, Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1992 Importance : 151 f. Présentation : ill. Format : 30 cm. Note générale : Phd Thesis : Chemical engineering : University of Manchester: 1992 Annexe f. 152 - 206 . Bibliogr. f. 207 - 216 Langues : Anglais (eng) Mots-clés : Halogenated  hydrocarbon Water  systems Gas-liquid  chromatographic Isopiestic  apparatus UNIFAC  model Infinite  dilution  activity  coefficients Index. décimale : D001592 Résumé : The present work is divided into two parts. Firstly, the experimental determination of the activity coefficients at infinite dilution for a number of halogenated hydrocarbon/water systems in the temperature range 285.15 K to 323.15 K hasneen made. Two different techniques havebeen used for their study, a gas-liquid chromatographic technique for water-rich mixtures and an isopiestic apparatus for organic-rich mixtures. The second part of this work is to estimate new or updated group interaction parameters for the UNIFAC model and two of its modifications, the effective UNIFAC and the effective UNIFAC with modified Staverman-Guggenhem combinatorial, using the experimental data. The updated parameters have been used to predict infinite dilution activity coefficients for a range of halogenated hydrocarbon/water mixtures not measured in this work. A comparison of experimental and calculated activity coefficients has proved encouraging. Phase equilibria in very dilute mixtures of water and halogenated hydrocarbons [texte imprimé] / Brahim Khalfaoui, Auteur ; D. M. T. Newsham, Directeur de thèse . - Manchester : [s.n.], 1992 . - 151 f. : ill. ; 30 cm. Phd Thesis : Chemical engineering : University of Manchester: 1992 Annexe f. 152 - 206 . Bibliogr. f. 207 - 216 Langues : Anglais (eng) Mots-clés : Halogenated  hydrocarbon Water  systems Gas-liquid  chromatographic Isopiestic  apparatus UNIFAC  model Infinite  dilution  activity  coefficients Index. décimale : D001592 Résumé : The present work is divided into two parts. Firstly, the experimental determination of the activity coefficients at infinite dilution for a number of halogenated hydrocarbon/water systems in the temperature range 285.15 K to 323.15 K hasneen made. Two different techniques havebeen used for their study, a gas-liquid chromatographic technique for water-rich mixtures and an isopiestic apparatus for organic-rich mixtures. The second part of this work is to estimate new or updated group interaction parameters for the UNIFAC model and two of its modifications, the effective UNIFAC and the effective UNIFAC with modified Staverman-Guggenhem combinatorial, using the experimental data. The updated parameters have been used to predict infinite dilution activity coefficients for a range of halogenated hydrocarbon/water mixtures not measured in this work. A comparison of experimental and calculated activity coefficients has proved encouraging.

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The development of instrumentation to monitor the flux densities of vapour species during the deposition of zinc sulphoselenide film material / Mohammed Benyezzar 

Public ISBD Titre : The development of instrumentation to monitor the flux densities of vapour species during the deposition of zinc sulphoselenide film material Type de document : texte imprimé Auteurs : Mohammed Benyezzar, Auteur ; D. King, Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1986 Importance : Mult. Présentation : ill. Format : 27 cm. Note générale : Master of science : Chemistry : Victoria University of Manchester : 1986 Annexe [5] f. Bibliogr. [3] f. Langues : Anglais (eng) Mots-clés : Vapour  --  species  ;  Zinc  --  sulphoselenide  --  films  ;  Theory  of  modulated  beam  spectrometry Index. décimale : M006686 Résumé : This thesis contains a description of instrumentation developed for the study of the concentration of vapour species present during the growth of zinc sulphoselenide films on gallium arsenide substrate using molecular beam epitaxy. It is the object of the work to provide a method for controlling the vapourization of the alloy constituents during a film deposition. The introduction in chapter I outlines briefly the aim of the project and reviews the advantages of using mass spectrometers, the logarithmic display of ion currents in mass spectra, modulated molecular beam mass spectrometry and multisource evaporation. The development of a logarithmic display system for the ion currents detected at the output of the electron multiplier of a quadrupole mass spectrometer is described in chapter II. Chapter III gives a literature review of modulated molecular beam mass spectrometry. Calibration of the mass spectrometer, beam modulation techniques and the effects of molecule transit times are outlined. In chapter IV the instruments developed for the application of modulated molecular beam mass spectrometry to the vapourization of zinc selenide and zinc sulphoselenide compounds are described. The influence of an already existing deposition apparatus on the mechanical design of parts for the vapour chopping system are outlined. The development of instrumentation to monitor the flux densities of vapour species during the deposition of zinc sulphoselenide film material [texte imprimé] / Mohammed Benyezzar, Auteur ; D. King, Directeur de thèse . - Manchester : [s.n.], 1986 . - Mult. : ill. ; 27 cm. Master of science : Chemistry : Victoria University of Manchester : 1986 Annexe [5] f. Bibliogr. [3] f. Langues : Anglais (eng) Mots-clés : Vapour  --  species  ;  Zinc  --  sulphoselenide  --  films  ;  Theory  of  modulated  beam  spectrometry Index. décimale : M006686 Résumé : This thesis contains a description of instrumentation developed for the study of the concentration of vapour species present during the growth of zinc sulphoselenide films on gallium arsenide substrate using molecular beam epitaxy. It is the object of the work to provide a method for controlling the vapourization of the alloy constituents during a film deposition. The introduction in chapter I outlines briefly the aim of the project and reviews the advantages of using mass spectrometers, the logarithmic display of ion currents in mass spectra, modulated molecular beam mass spectrometry and multisource evaporation. The development of a logarithmic display system for the ion currents detected at the output of the electron multiplier of a quadrupole mass spectrometer is described in chapter II. Chapter III gives a literature review of modulated molecular beam mass spectrometry. Calibration of the mass spectrometer, beam modulation techniques and the effects of molecule transit times are outlined. In chapter IV the instruments developed for the application of modulated molecular beam mass spectrometry to the vapourization of zinc selenide and zinc sulphoselenide compounds are described. The influence of an already existing deposition apparatus on the mechanical design of parts for the vapour chopping system are outlined.

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The efficiency of nutrient utilization of tomato using the nutrient film technique / Rachid Sahraoui 

Public ISBD Titre : The efficiency of nutrient utilization of tomato using the nutrient film technique Type de document : texte imprimé Auteurs : Rachid Sahraoui, Auteur ; P. Newton, Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1991 Importance : 268 f. Présentation : ill. Format : 30 cm. Note générale : Phd Thesis : Environmental engineering : Victoria University of Manchester : 1991 Bibliogr. f. 270 - 277 . Annexe f. 279 - 306 Langues : Anglais (eng) Mots-clés : Tomato  cultivar  counter Nutrient  film  technique Nutrient  use  efficiency Index. décimale : D001591 Résumé : The tomato cultivar counter has been grown using Nutrient Film Technique at different time of the year with different nutrient solution stregths in order to investigate the reasons for variability in Nutrient Use Efficiency (N.U.E.) i.e. the relationship between production of fruit per unit uptake of N, P, K and ca. The technique of growth analysis was used to determine primary and derived growth data of plants grown at high density (11.9 plants/M²) up to anthesis and at low density (3.5 plants/m²) from just before anthesis to 119 days from sowing. Solution strength from CF to 30 and from 20 to 173 were used for the high and low density plants respectively. During sample intervals mean air temperature ranged from just over 18°C to 25.7°C per day, and PAR from 30 J/cm²/day to 544 J/cm²/day. Data for flower and fruit dry weights plotted against the total tissue N, P, K and Ca content gave irrespective of plant age, sowing date and nutrient solution conditions, r² of 0.94, 0.90, 0.94 and 0.85 for N, P, K and Ca respectively. There was no consistent effect of growing conditions or plant age that could be related to the deviations from the regression lines, except some of the results for N and P were for plants that only had flowers and few green fruit. When amounts of light were relatively low (i.e on average less than 100 J/cm²/day PAR), growth rates were relatively low, some inflorescences aborted and flowering and fruiting were delayed. Insufficient data was obtained, however, to be able to assess the effect of inflorescences abortion on N.U.E.with the group of plants that had some aborted first inflorescences, the percentages ranged from 30 to 60%, with the high figure coming from the lowest nutrient solution strength (CF20). Increase in solutionstrength from 20 to 50 did not, however, give a systematic reduction in percentage abortion. The amount of PAR associated with the abortion was 48 J/cm²/day. No inflorescences aborted on another group of plants grown with 41 J/cm²/day, during the period when abortion might have been expected to occur; possible reasons for this difference were discussed. With this group of plants, there was a decrease in ratio of leaf plus stem plus root dry weight to flower dry weight with increase in solution nutrient strength from CF10 to 30. The efficiency of nutrient utilization of tomato using the nutrient film technique [texte imprimé] / Rachid Sahraoui, Auteur ; P. Newton, Directeur de thèse . - Manchester : [s.n.], 1991 . - 268 f. : ill. ; 30 cm. Phd Thesis : Environmental engineering : Victoria University of Manchester : 1991 Bibliogr. f. 270 - 277 . Annexe f. 279 - 306 Langues : Anglais (eng) Mots-clés : Tomato  cultivar  counter Nutrient  film  technique Nutrient  use  efficiency Index. décimale : D001591 Résumé : The tomato cultivar counter has been grown using Nutrient Film Technique at different time of the year with different nutrient solution stregths in order to investigate the reasons for variability in Nutrient Use Efficiency (N.U.E.) i.e. the relationship between production of fruit per unit uptake of N, P, K and ca. The technique of growth analysis was used to determine primary and derived growth data of plants grown at high density (11.9 plants/M²) up to anthesis and at low density (3.5 plants/m²) from just before anthesis to 119 days from sowing. Solution strength from CF to 30 and from 20 to 173 were used for the high and low density plants respectively. During sample intervals mean air temperature ranged from just over 18°C to 25.7°C per day, and PAR from 30 J/cm²/day to 544 J/cm²/day. Data for flower and fruit dry weights plotted against the total tissue N, P, K and Ca content gave irrespective of plant age, sowing date and nutrient solution conditions, r² of 0.94, 0.90, 0.94 and 0.85 for N, P, K and Ca respectively. There was no consistent effect of growing conditions or plant age that could be related to the deviations from the regression lines, except some of the results for N and P were for plants that only had flowers and few green fruit. When amounts of light were relatively low (i.e on average less than 100 J/cm²/day PAR), growth rates were relatively low, some inflorescences aborted and flowering and fruiting were delayed. Insufficient data was obtained, however, to be able to assess the effect of inflorescences abortion on N.U.E.with the group of plants that had some aborted first inflorescences, the percentages ranged from 30 to 60%, with the high figure coming from the lowest nutrient solution strength (CF20). Increase in solutionstrength from 20 to 50 did not, however, give a systematic reduction in percentage abortion. The amount of PAR associated with the abortion was 48 J/cm²/day. No inflorescences aborted on another group of plants grown with 41 J/cm²/day, during the period when abortion might have been expected to occur; possible reasons for this difference were discussed. With this group of plants, there was a decrease in ratio of leaf plus stem plus root dry weight to flower dry weight with increase in solution nutrient strength from CF10 to 30.

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Techniques of estimation and testing for the limited dependent variable models / Hamoudi Hadj Sahraoui 

Public ISBD Titre : Techniques of estimation and testing for the limited dependent variable models Type de document : texte imprimé Auteurs : Hamoudi Hadj Sahraoui, Auteur ; R. W. Blundell, Directeur de thèse ; L. Gill, Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1984 Importance : 67 f. Présentation : ill. Format : 30 cm. Note générale : Master Degree : Econometrics and Social Statistics : University of Manchester : 1984 Annexe f. 68 - 69 . Bibliogr. f. 70 - 72 Langues : Anglais (eng) Mots-clés : Econometrics Logit  model Probit  model Methods  likelihood Index. décimale : Ms00484 Résumé : One of the main objectives of econometrics is the use of statistical and mathematical techniques for the measurement of economic relations and prediction of the economic behaviour of the agents. Often the phénomenon observed is a continuous one and the econometric theory provides us with a wide range of techniques for estimating this kind of model. Sometimes, however, one is faced with the problem of the dependent variable being either qualitative or limited in its range. When the observations on the dependent variable are either "O" or "1" we say that we have a qualitative response data and the model consists of finding the probability that an economic agent with a given set of characteristics will make one choice rather than another. Two models are used for this kind of qualitative choice model. The Logit model and the Probit model. The first section of this dissertation consists mainly of surveying the most used techniques of estimations which I classified in 2 categories: the maximum likelihood procedures and the bias selection methods; I also included the least absolute deviation estimator for censored models for testing purposes. The remaining section, however will be entirely devoted to surveying the kind of tests which are used to test the validity of the limited dependent variable model. Techniques of estimation and testing for the limited dependent variable models [texte imprimé] / Hamoudi Hadj Sahraoui, Auteur ; R. W. Blundell, Directeur de thèse ; L. Gill, Directeur de thèse . - Manchester : [s.n.], 1984 . - 67 f. : ill. ; 30 cm. Master Degree : Econometrics and Social Statistics : University of Manchester : 1984 Annexe f. 68 - 69 . Bibliogr. f. 70 - 72 Langues : Anglais (eng) Mots-clés : Econometrics Logit  model Probit  model Methods  likelihood Index. décimale : Ms00484 Résumé : One of the main objectives of econometrics is the use of statistical and mathematical techniques for the measurement of economic relations and prediction of the economic behaviour of the agents. Often the phénomenon observed is a continuous one and the econometric theory provides us with a wide range of techniques for estimating this kind of model. Sometimes, however, one is faced with the problem of the dependent variable being either qualitative or limited in its range. When the observations on the dependent variable are either "O" or "1" we say that we have a qualitative response data and the model consists of finding the probability that an economic agent with a given set of characteristics will make one choice rather than another. Two models are used for this kind of qualitative choice model. The Logit model and the Probit model. The first section of this dissertation consists mainly of surveying the most used techniques of estimations which I classified in 2 categories: the maximum likelihood procedures and the bias selection methods; I also included the least absolute deviation estimator for censored models for testing purposes. The remaining section, however will be entirely devoted to surveying the kind of tests which are used to test the validity of the limited dependent variable model.

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Industrial policy in France, 1973-85 / Abdennacer Moussi 

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Failure identification methods for detecting leaks in pipelines and sensor faults / Benkherouf, Abdelkrim 

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Charge injection into insulators / B. Bouattou 

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Some aspects of NMR spectroscopy / Laidoudi Bouakkar 

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Application of surge diverters to the protection of gas-insulated substations / Tedjeddine Missoum 

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Toriconical pressure vessels with thickness which varies piecewise linearly and stepwise / Ahmed Berras

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Strain distribution through the thickness of glass reinforced laminates under bending loads / Mohamed Tahraoui

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Design and construction of a magnetoresistive microphone / Addad, Malik

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Sequencing of the packing activity in large detergent plant / K. Belarbi

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Energy losses in centrifugal fans / A. Khaldi

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