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Showing 1 to 20 of 45 for “"660 Chemical engineering"”.
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The simultaneous electrodeposition of lead and lead dioxide
… proved to be poor. Certain physical and electrochemical properties of foils that exhibited both 'good' and 'bad' adhesion of PbO2 were investigated, in order to ascertain the cause of the adhesion problem. A number of possible reasons for the poor adhesion of PbO2 to certain batches of Ni foil …
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The colour of AuAgCu alloys
The colorimetric properties of the AuAgCu ternary system have been examined with a nulling spectro-ellipsometer. The use of an ellipsometer to derive the colour co-ordinates of a sample is a novel technique. The ellipsometer has the advantages for use as a physical colorimeter in that its …
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Fatigue stiffness loss and life prediction technique development of a real rubber automotive component by means of Finite Element Analysis
The main aim of the study has been to investigate the potential of providing a complete rubber fatigue behaviour predictions. The work explores the nucleation and growth of cracks, but including stiffness loss and damage evolution. It has been performed in two filled rubbers, one natural rubber and …
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The diffusion of water and aviation fuel in polysulphide sealants
The diffusion and permeation of aviation fuel (Avtur) and water in commercial and 'model' polysulphide sealants have been studied using simple gravimetric techniques. For Avtur, the mass uptake behaviour is explicable in terms of normal, Fickian diffusion, and the diffusion coefficient determined …
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Plasticity and impact test studies on thermoplastic materials, finite element analysis and experimental correlation
The primary aim of the study was to evaluate the validity of the elasto-plastic constitutive models implemented in the Finite Element Analysis (FEA) software ANSYS~. This was carried out comparing experimental tensile, bending and puncture or plate penetration test results with the corresponding …
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The effect of hydrogen on the passivation process of iron
A thorough survey of the literature relating to the state of hydrogen in metals, factors influencing solubility and diffusion parameters has been reported. The experimental techniques available for studying these properties have been reviewed and the related theories of passivity compared as a …
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Biofilm formation on metal surfaces
… adhesion assessed. LPS have been analysed chemically by gas-chromatography (GC-FID) and gas chromatography-mass spectrometry (GC-MS) to determine their carbohydrate composition and fatty acid content. On the basis of the results obtained the involvement of glucose and N-acetylglucosamine, …
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Diffusion problems in lead-tin overlay bearings
The corrosion of lead-tin overlay bearings in hot lubricating oils, through the depletion of tin in the overlay, has been recognised as a problem of some severity in the automotive bearing industry. The inter-diffusion of tin in the overlay and the copper in the underlying substrate results in the …
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The synthesis, structure and fungicidal activity of guanidinophosphonic acids and their aminophosphonic precursors
Alkanephosphonic acids of the classes a-amino, a-guanidino, a-(hydroxy)amino, a-thioureido, w-amino, and w-guanidino have been prepared, and also the u-amino and 10-guanidino types having aza substituents In positions 2 and 3 In the alkyl chain. The 1H, 13C, and 31p nmr spectroscopy of these …
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Colours and other optical properties of binary noble metal-noble metal alloys
The method of ellipsometry is applied to the study of the optical properties of Ag-Au, Ag-Cu and Au-Cu alloys and the results are interpreted in terms of alloy colour and electronic properties. Variation of colour with alloy composition is placed on a quantitative basis for the first time and …
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Influence of Polyolefin Contamination on the Thermal Characteristics of Bottle Grade Recycled Polyethylene Terephthalate
During the mechanical recycling, especially during the sorting and separation process of bottle grade PET, cross contamination with polyolefin is inevitable. Very small number of polyolefin bottles, caps and closures pass through the separation process and get recycled with PET bottles and affect …
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