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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
Mémoire de Magister :Environnement
Annexe f 78 - 104. Bibliogr. f 105 - 106Langues : 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 : University of Aston, 1984 . - 77 f. : ill. ; 27 cm.
Mémoire de Magister : Environmental and Occupational Health : Birmingham, University of Aston : 1984
Mémoire de Magister :Environnement
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.Réservation
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Code-barres Cote Support Localisation Section Disponibilité Spécialité Etat_Exemplaire M005984 M005984 Papier + ressource électronique Bibliothèque Annexe Mémoire de Magister Disponible Consultation sur place/Téléchargeable Documents numériques
MASSIM.Y.pdfURL
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 - 67Langues : Anglais (eng) Mots-clés : Human factors Criticality 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 : 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 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.Réservation
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CHAABANE.S.pdfURL
Titre : Applications of field-evaporation theory Type de document : texte imprimé Auteurs : Khaled Chibane, Auteur ; R. G. Forbes, Directeur de thèse Editeur : Birmingham : University of Aston Année de publication : 1985 Importance : 240 f. Présentation : ill. Format : 29 cm. Note générale : Thèse de Doctorat : Électronique : Birmingham, University of Aston: 1985
Annexe f. 241 - 264 . - Bibliogr. f. 265 - 273Langues : Anglais (eng) Mots-clés : Field-ion emission
Field-evaporation
Surface atomic parametersIndex. décimale : D006285 Résumé : This thesis is concerned with the application of the theory of the evaporation of metal atoms from a surface under the influence of a strong electric field.
The theory of field evaporation under discussion, put forward by Forbes, assumes that the shape of the atomic bonding-well is parabolic and also that a Gomer-type mechanism operates.
When this theory is combined with a standard Arrhenius-type emission equation, we predict linear relationships between T² and l/F and also between Xcr and Q¹/², where T is the temperature, F the electric field necessary for evaporation, Xcr the crossing point of the atomic and ionic curves and Q the activation energy.
Experimental results obtained by various workers using Tungsten, Molybdenum and Rhodium tips in an electric field, are compared with this theory over a limited temperature range.
The employment of other forms for the atomic bonding-well has also been investigated, in order to improve the performance of the theory at high temperatures.
In the case of Rhodium, values have been derived for some surface atomic parameters, namely, the electrical bonding distance of a surface atom nucleus and the vibrational force-constant and frequency of a typical surface atom.Applications of field-evaporation theory [texte imprimé] / Khaled Chibane, Auteur ; R. G. Forbes, Directeur de thèse . - Birmingham : University of Aston, 1985 . - 240 f. : ill. ; 29 cm.
Thèse de Doctorat : Électronique : Birmingham, University of Aston: 1985
Annexe f. 241 - 264 . - Bibliogr. f. 265 - 273
Langues : Anglais (eng)
Mots-clés : Field-ion emission
Field-evaporation
Surface atomic parametersIndex. décimale : D006285 Résumé : This thesis is concerned with the application of the theory of the evaporation of metal atoms from a surface under the influence of a strong electric field.
The theory of field evaporation under discussion, put forward by Forbes, assumes that the shape of the atomic bonding-well is parabolic and also that a Gomer-type mechanism operates.
When this theory is combined with a standard Arrhenius-type emission equation, we predict linear relationships between T² and l/F and also between Xcr and Q¹/², where T is the temperature, F the electric field necessary for evaporation, Xcr the crossing point of the atomic and ionic curves and Q the activation energy.
Experimental results obtained by various workers using Tungsten, Molybdenum and Rhodium tips in an electric field, are compared with this theory over a limited temperature range.
The employment of other forms for the atomic bonding-well has also been investigated, in order to improve the performance of the theory at high temperatures.
In the case of Rhodium, values have been derived for some surface atomic parameters, namely, the electrical bonding distance of a surface atom nucleus and the vibrational force-constant and frequency of a typical surface atom.Réservation
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CHIBANE.Khaled.pdfURLEvaluation of nitrosobenzoic esters as processing and photo-stabilisers for polypropylene / Boucenna, Ammar (1984)
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 - 125Langues : 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 : 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.Réservation
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Code-barres Cote Support Localisation Section Disponibilité Spécialité Etat_Exemplaire M005784 M005784 Papier + ressource électronique Bibliothèque Annexe Mémoire de Magister Disponible Genie_chimique Consultation sur place/Téléchargeable Documents numériques
BOUCENNA.Ammar.pdfURL
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 - 120Langues : 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 : 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.Réservation
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TOUTAOUI.Mustapha.pdfURL
