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An approach to system safety analysis / S. Chaabane 

Public ISBD Titre : An approach to system safety analysis Type de document : texte imprimé Auteurs : S. Chaabane, Auteur ; H. Raafat, Directeur de thèse Editeur : Birmingham : University of Aston Année de publication : 1979 Importance : 64 f. Présentation : ill. Format : 27 cm. Note générale : Mémoire de Magister : Safety and Hygiene : Bimingham, University of Aston : 1979 Bibliogr. f. 65 - 67 Langues : Anglais (eng) Mots-clés : Human  factors  ;  Criticality  factors  ;  Markham  colliery  brake  system  FMA  FTA  ;  Safety  criteria Index. décimale : M000379 Résumé : Safety and reliability are concepts that do not always lend themselves to rigorous analysis. However, two techniques failure mode analysis and fault tree analysis provide ways to formalize safety studies so that they acquire some of the logic and precision associated with traditional engineering. The main objectives of the present work are covered in two parts: Part one, examines the (FMA and FTA) techniques in terms of the state of the art, looking particularly at the human factors concept. It also explores current ideas on acceptability margins of safety and levels of risk. Part two, develops human factors in both techniques, by proposing a guide to criticality factors and a subjective way of rating these factors. The markham colliery brake system is analysed in order to examine the effectiveness and flexibility of the methods in actual industrial situations. In the conclusion, the usefulness of the subjective methods both in human reliability and assessment of risk is enhanced even more. Finally suggestions are made as to where these techniques can be applied. An approach to system safety analysis [texte imprimé] / S. Chaabane, Auteur ; H. Raafat, Directeur de thèse . - Birmingham (Birmingham) : University of Aston, 1979 . - 64 f. : ill. ; 27 cm. Mémoire de Magister : Safety and Hygiene : Bimingham, University of Aston : 1979 Bibliogr. f. 65 - 67 Langues : Anglais (eng) Mots-clés : Human  factors  ;  Criticality  factors  ;  Markham  colliery  brake  system  FMA  FTA  ;  Safety  criteria Index. décimale : M000379 Résumé : Safety and reliability are concepts that do not always lend themselves to rigorous analysis. However, two techniques failure mode analysis and fault tree analysis provide ways to formalize safety studies so that they acquire some of the logic and precision associated with traditional engineering. The main objectives of the present work are covered in two parts: Part one, examines the (FMA and FTA) techniques in terms of the state of the art, looking particularly at the human factors concept. It also explores current ideas on acceptability margins of safety and levels of risk. Part two, develops human factors in both techniques, by proposing a guide to criticality factors and a subjective way of rating these factors. The markham colliery brake system is analysed in order to examine the effectiveness and flexibility of the methods in actual industrial situations. In the conclusion, the usefulness of the subjective methods both in human reliability and assessment of risk is enhanced even more. Finally suggestions are made as to where these techniques can be applied.

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CHAABANE.S.pdf URL

Evaluation of nitrosobenzoic esters as processing and photo-stabilisers for polypropylene / Boucenna, Ammar 

Public ISBD Titre : Evaluation of nitrosobenzoic esters as processing and photo-stabilisers for polypropylene Type de document : texte imprimé Auteurs : Boucenna, Ammar, Auteur ; Scott, G., Directeur de thèse Editeur : Birmingham : University of Aston Année de publication : 1984 Importance : 114 f. Présentation : ill. Format : 27 cm. Note générale : Mémoire de Magister : Génie Chimique : Birmingham, The University of Aston : 1984 Annexe f. 115 - 122 Bibliogr. f. 123 - 125 Langues : Anglais (eng) Mots-clés : Polypropylene  ;  C-nitroso  --  compounds  --  anti-oxidant  ;  Photostabilisation Index. décimale : M005784 Résumé : In the present work, the effects of C-nitroso compounds on the melt-stabilisation, thermal and photo-oxidation of polypropylene have been studied. Both aliphatic and aromatic nitroso compounds were found to be effective melt stabilisers for PP. The stabilising effects were shown to be due to the ability of these compounds to terminate macro-alkyl radicals producing nitroxyl radicals. Nitroso-tert-butane was found to be a more effective uv stabiliser than nitrosobenzene and the esters of nitrosobenzene. This has been attributed to the fact that aromatic nitroso compounds produce quinonoid structures which might sensitise the photo-oxidation process. The additives may be arranged in the following order of decreased uv stabilisation effectiveness. Nitroso-tert-butane > p-isobutyl ester nitrosobenzene > p-lauryl ester nitrosobenzene > nitrosobenzene. Aromatic nitroso compounds have been shown to be better thermal anti-oxidants than nitroso-tert-butane. This is due to the abitity of the aromatic nitroso compounds to scavenge both alkyl and alkyl peroxy radicals. The aliphatic nitroso compounds can only scavenge alkyl and alkoxy radicals. The order of efficiency of the additives as termal anti-oxidants during oven ageing at 140°C may be arranged as follows. p-lauryl ester nitrosobenzene > p-isobutyl ester nitrosobenzene > nitrosobenzene > nitroso-tert-butane. The present study also attempted to explain the mechanism of anti-oxidant action of nitroso compounds on the basis of model compound studies. Evaluation of nitrosobenzoic esters as processing and photo-stabilisers for polypropylene [texte imprimé] / Boucenna, Ammar, Auteur ; Scott, G., Directeur de thèse . - Birmingham (Birmingham) : University of Aston, 1984 . - 114 f. : ill. ; 27 cm. Mémoire de Magister : Génie Chimique : Birmingham, The University of Aston : 1984 Annexe f. 115 - 122 Bibliogr. f. 123 - 125 Langues : Anglais (eng) Mots-clés : Polypropylene  ;  C-nitroso  --  compounds  --  anti-oxidant  ;  Photostabilisation Index. décimale : M005784 Résumé : In the present work, the effects of C-nitroso compounds on the melt-stabilisation, thermal and photo-oxidation of polypropylene have been studied. Both aliphatic and aromatic nitroso compounds were found to be effective melt stabilisers for PP. The stabilising effects were shown to be due to the ability of these compounds to terminate macro-alkyl radicals producing nitroxyl radicals. Nitroso-tert-butane was found to be a more effective uv stabiliser than nitrosobenzene and the esters of nitrosobenzene. This has been attributed to the fact that aromatic nitroso compounds produce quinonoid structures which might sensitise the photo-oxidation process. The additives may be arranged in the following order of decreased uv stabilisation effectiveness. Nitroso-tert-butane > p-isobutyl ester nitrosobenzene > p-lauryl ester nitrosobenzene > nitrosobenzene. Aromatic nitroso compounds have been shown to be better thermal anti-oxidants than nitroso-tert-butane. This is due to the abitity of the aromatic nitroso compounds to scavenge both alkyl and alkyl peroxy radicals. The aliphatic nitroso compounds can only scavenge alkyl and alkoxy radicals. The order of efficiency of the additives as termal anti-oxidants during oven ageing at 140°C may be arranged as follows. p-lauryl ester nitrosobenzene > p-isobutyl ester nitrosobenzene > nitrosobenzene > nitroso-tert-butane. The present study also attempted to explain the mechanism of anti-oxidant action of nitroso compounds on the basis of model compound studies.

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BOUCENNA.Ammar.pdf URL

Accidents of cranes and their prevention / Y. Massim 

Public ISBD Titre : Accidents of cranes and their prevention Type de document : texte imprimé Auteurs : Y. Massim, Auteur ; R. T. Booth, Directeur de thèse Editeur : Birmingham : University of Aston Année de publication : 1984 Importance : 77 f. Présentation : ill. Format : 27 cm. Note générale : Mémoire de Magister : Environmental and Occupational Health : Birmingham, University of Aston : 1984 Annexe f 78 - 104. Bibliogr. f 105 - 106 Langues : Anglais (eng) Mots-clés : Occupational  ;  Health  ;  Crane  accidents  ;  Fatigue  ;  Accident  prevention Index. décimale : M005984 Résumé : Crane accidents are sufficiently frequent and severe in terms of human suffering and financial costs to merit better safety efforts directed towards their reduction. The causes of crane accidents, although varied, usually fall under one or more of the following categories: 1/ Poor design feature; 2/ Operational errors and omissions (including errors committed during planning of operations); 3/ Inadequate and irregular inspection and maintenance of the machines and their associated equipment. Statistics of accidents indicate that the underlying category, responsible for a large proportion of accidents is that of operational errors and omissions. These errors generally originate from inadequate planning, inadequate system of work, poor training standards of the operator and lack of standardisation of machine controls among different makes and models of cranes. These factors surely, represent an area where urgent remedial action is needed to promote the safe use of cranes. Deficiencies in inspection and maintenance of cranes also account for a large number of accidents. Proper inspection and maintenance of a crane are complicated tasks requiring good knowledge and experience in a number of engineering disciplines. Therefore, expert advice and services in this field remain essential elements to the reduction of crane accidents. The number of accidents caused by poor design features is relatively small - metal fatigue remains one of the commonest causes of failure partially related to machine design. Design contribution towards the reduction of crane accidents would, probably, be best achieved by designing and developing safety systems which would prevent the machine operating under adverse conditions, such as overloading or out-of level positioning. Accidents of cranes and their prevention [texte imprimé] / Y. Massim, Auteur ; R. T. Booth, Directeur de thèse . - Birmingham (Birmingham) : University of Aston, 1984 . - 77 f. : ill. ; 27 cm. Mémoire de Magister : Environmental and Occupational Health : Birmingham, University of Aston : 1984 Annexe f 78 - 104. Bibliogr. f 105 - 106 Langues : Anglais (eng) Mots-clés : Occupational  ;  Health  ;  Crane  accidents  ;  Fatigue  ;  Accident  prevention Index. décimale : M005984 Résumé : Crane accidents are sufficiently frequent and severe in terms of human suffering and financial costs to merit better safety efforts directed towards their reduction. The causes of crane accidents, although varied, usually fall under one or more of the following categories: 1/ Poor design feature; 2/ Operational errors and omissions (including errors committed during planning of operations); 3/ Inadequate and irregular inspection and maintenance of the machines and their associated equipment. Statistics of accidents indicate that the underlying category, responsible for a large proportion of accidents is that of operational errors and omissions. These errors generally originate from inadequate planning, inadequate system of work, poor training standards of the operator and lack of standardisation of machine controls among different makes and models of cranes. These factors surely, represent an area where urgent remedial action is needed to promote the safe use of cranes. Deficiencies in inspection and maintenance of cranes also account for a large number of accidents. Proper inspection and maintenance of a crane are complicated tasks requiring good knowledge and experience in a number of engineering disciplines. Therefore, expert advice and services in this field remain essential elements to the reduction of crane accidents. The number of accidents caused by poor design features is relatively small - metal fatigue remains one of the commonest causes of failure partially related to machine design. Design contribution towards the reduction of crane accidents would, probably, be best achieved by designing and developing safety systems which would prevent the machine operating under adverse conditions, such as overloading or out-of level positioning.

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M005984	M005984	Papier	Bibliothèque centrale	Mémoire de Magister	Disponible

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MASSIM.Y.pdf URL

A general risk Assessment of flammable gas detectors / Mustapha Toutaoui 

Public ISBD Titre : A general risk Assessment of flammable gas detectors Type de document : texte imprimé Auteurs : Mustapha Toutaoui, Auteur ; H. M. N. Raafat, Directeur de thèse Editeur : Birmingham : University of Aston Année de publication : 1984 Importance : 98 f. Présentation : ill. Format : 27 cm. Note générale : Mémoire de Magister : Occupational Health and Safety : Birmingham, University of Aston : 1984 Annexe f. 99 - 115 . Bibliogr. f. 116 - 120 Langues : Anglais (eng) Mots-clés : Occupational  --  health  --  safety  ;  Flammable  --  gas  ;  Gas  detection  system  ANOVA  table Index. décimale : M006084 Résumé : Flammable gas detectors provide the means whereby personnel concerned with health and safety activities can easily determine the presence of and evaluate the concentration of combustible gases or vapours in the workplace. This project attempts to outline the limitations that a user should consider and recognise when using a flammable gas detector. features such as sensitivity, reliability and intrinsic safety were studied. Failure mode analysis and fault tree analysis techniques ware used. The criticality estimates obtained suggested that some corrective measures were needed. Initiators arranged in redundant configurations, use of "de-bugging" or "Burn-in" process, and regular maintenance by competent personnel, was shown to be vital for achieving the high levels of reliability associated with the safety system. A statistical analysis of past data was undertaken and relationships among the different variables were shown. An experimental programme was carried out, using pellister type catalytic detectors. Examination of their susceptibility and behaviour when exposed to different temperature were carried out. Two flammable gases were used. These were acetone and butanol. For both of them a decrease in the amount oxidised was obtained as temperature was increased. Also, a study of the basic requirements for the use of flammable gas detectors was outlined. A general risk Assessment of flammable gas detectors [texte imprimé] / Mustapha Toutaoui, Auteur ; H. M. N. Raafat, Directeur de thèse . - Birmingham (Birmingham) : University of Aston, 1984 . - 98 f. : ill. ; 27 cm. Mémoire de Magister : Occupational Health and Safety : Birmingham, University of Aston : 1984 Annexe f. 99 - 115 . Bibliogr. f. 116 - 120 Langues : Anglais (eng) Mots-clés : Occupational  --  health  --  safety  ;  Flammable  --  gas  ;  Gas  detection  system  ANOVA  table Index. décimale : M006084 Résumé : Flammable gas detectors provide the means whereby personnel concerned with health and safety activities can easily determine the presence of and evaluate the concentration of combustible gases or vapours in the workplace. This project attempts to outline the limitations that a user should consider and recognise when using a flammable gas detector. features such as sensitivity, reliability and intrinsic safety were studied. Failure mode analysis and fault tree analysis techniques ware used. The criticality estimates obtained suggested that some corrective measures were needed. Initiators arranged in redundant configurations, use of "de-bugging" or "Burn-in" process, and regular maintenance by competent personnel, was shown to be vital for achieving the high levels of reliability associated with the safety system. A statistical analysis of past data was undertaken and relationships among the different variables were shown. An experimental programme was carried out, using pellister type catalytic detectors. Examination of their susceptibility and behaviour when exposed to different temperature were carried out. Two flammable gases were used. These were acetone and butanol. For both of them a decrease in the amount oxidised was obtained as temperature was increased. Also, a study of the basic requirements for the use of flammable gas detectors was outlined.

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TOUTAOUI.Mustapha.pdf URL

The prevention and control of marine pollution / Tewfik Larbi Brahimi 

Public ISBD Titre : The prevention and control of marine pollution Type de document : texte imprimé Auteurs : Tewfik Larbi Brahimi, Auteur ; R. Barratt, Directeur de thèse Editeur : Birmingham : University of Aston Année de publication : 1984 Importance : 78 f. Présentation : ill. Format : 30 cm. Note générale : Mémoire de Master : Environmental and Occupational Health : Birmingham, University of Aston : 1984 Bibliogr. f. 79 - 83 . Annexe f. 84 - 118 Langues : Anglais (eng) Mots-clés : Marine  pollution Polluants Waste  treatment  techniques Sea  disposal Index. décimale : Ms00584 Résumé : In this present work, the various parameters related to the marine environment i.e. aquatic ecosystem, biodegradation, the biological oxygen demand and the effects of classes of pollutants on the marine environment are described. The main prevention and control measures in the field of marine pollution are reviewed and their limitations considered. These measures fall into three categories: a/ Legislation: International conventions. b/ The assessment of the behaviour of pollutants in the marine environment, using mathematical models. c/ Use of waste treatment techniques and disposal methods other than sea disposal. It is recognised that the prevention of marine pollution, from ship-based sources, is best dealt with at the global level whereas land-based sources and dumping operations in shallow seas are best dealt with at the Regional and ultimately the National level. However, the implementation and enforcement of the provisions and regulations laid down in various international conventions, are still problems that need to be overcome. The accuracy of the mathematical models used for the assessment of the transportation and distribution of pollutants once discharged at sea could be questioned since various factors, such as currents, salinity, temperature and tides vary in scale and with time. Thus, the need for monitoring the marine environment is necessary where discharges occur i.e. estuarine and coastal waters. The industry should be encouraged to have on-site waste treatment facilities in order to reduce the pollution load of their discharges. Ideally industry should consider the control of the content of effluents at the design of the process that would be used. Finally, a better understanding of the marine environment and the effects of pollutants on marine organisms would allow for the setting of standards that could be met in qualitative and quantitive terms. The prevention and control of marine pollution [texte imprimé] / Tewfik Larbi Brahimi, Auteur ; R. Barratt, Directeur de thèse . - Birmingham (Birmingham) : University of Aston, 1984 . - 78 f. : ill. ; 30 cm. Mémoire de Master : Environmental and Occupational Health : Birmingham, University of Aston : 1984 Bibliogr. f. 79 - 83 . Annexe f. 84 - 118 Langues : Anglais (eng) Mots-clés : Marine  pollution Polluants Waste  treatment  techniques Sea  disposal Index. décimale : Ms00584 Résumé : In this present work, the various parameters related to the marine environment i.e. aquatic ecosystem, biodegradation, the biological oxygen demand and the effects of classes of pollutants on the marine environment are described. The main prevention and control measures in the field of marine pollution are reviewed and their limitations considered. These measures fall into three categories: a/ Legislation: International conventions. b/ The assessment of the behaviour of pollutants in the marine environment, using mathematical models. c/ Use of waste treatment techniques and disposal methods other than sea disposal. It is recognised that the prevention of marine pollution, from ship-based sources, is best dealt with at the global level whereas land-based sources and dumping operations in shallow seas are best dealt with at the Regional and ultimately the National level. However, the implementation and enforcement of the provisions and regulations laid down in various international conventions, are still problems that need to be overcome. The accuracy of the mathematical models used for the assessment of the transportation and distribution of pollutants once discharged at sea could be questioned since various factors, such as currents, salinity, temperature and tides vary in scale and with time. Thus, the need for monitoring the marine environment is necessary where discharges occur i.e. estuarine and coastal waters. The industry should be encouraged to have on-site waste treatment facilities in order to reduce the pollution load of their discharges. Ideally industry should consider the control of the content of effluents at the design of the process that would be used. Finally, a better understanding of the marine environment and the effects of pollutants on marine organisms would allow for the setting of standards that could be met in qualitative and quantitive terms.

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BRAHIMI.Tewfik-Larbi.pdf URL

Applications of field-evaporation theory / Khaled Chibane 

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The transient behaviour of plain concrete at elevated temperatures / Bali, Abderrahim 

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