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117 results on '"Baker, L.-J."'

1. Bake hardening in ultra-low and super ultra-low carbon steels

Author

Baker, L. J.

Subjects
669
Abstract

Review of the current literature identified key aspects of bake hardening steels that required further investigation. The test procedures used to characterise bake hardening steels are not standardised across the steel industry and have been investigated in this project, to ensure results obtained accurately reflect the in-service performance of the steel. The emphasis of research world-wide is on the development of super ultra-low carbon (SULC) bake hardening steel chemistries and a Nb-Ti stabilised steel of this type has been investigated in this programme. The influence of steel metallurgy and processing conditions on the properties of this steel have been studied, with an aim to optimising the bake hardening response obtained. The solute carbon content of a range of strip steels could be accurately measured using internal friction apparatus, allowing this equipment to be used as both a scientific and quality control tool. The bake hardening test procedure was investigated and it was found that variation in test parameters resulted in a 5N/mm2 variation in bake hardening response. Based on this, recommendations have been made for standardisation of the bake hardening test. The developmental Nb-Ti SULC bake hardening grade was studied to determine the metallurgical and processing areas that most influenced the bake hardening response. A two stage ageing process was identified and it was shown that this could be exploited to produce a higher bake hardening response, whilst maintaining room temperature ageing resistance. Grain size did not influence the bake hardening properties of this steel, although fine grain size did offer an improvement in room temperature ageing resistance. Continuous annealing at temperatures above 800°C improves the bake hardening response of under-stabilised Nb-Ti SULC bake hardening steel, reducing yield losses. Temper rolling of at least 1% offers adequate control of properties in this steel, ensuring it meets all of the customer specifications.

Published
2001

7. An amino acid change near the carboxy terminus of the Streptococcus gordonii regulatory protein Rgg affects its abilities to bind DNA and influence expression of the glucosyltransferase gene gtfG

Author

Vickerman, M. M., Wang, M., and Baker, L. J.

Subjects
Microbiology -- Research, Amino acids -- Physiological aspects, Carbon compounds -- Physiological aspects, Streptococcus -- Physiological aspects, Streptococcus -- Genetic aspects, Bacterial proteins -- Physiological aspects, Bacterial proteins -- Genetic aspects, DNA -- Genetic aspects, Gene expression -- Physiological aspects, Biological sciences
Abstract

Research has been conducted on regulatory protein Rgg from Streptococcus gordonii. Results suggest that S. gorgonii Rgg functional domains affecting glucosyltransferase expression may have implications for Rgg-like regulatory proteins in related bacteria.

Published
2003

37. Book Reviews

Author

Baker, L. J. V., primary, Cairns, Ed, additional, Gash, Hugh, additional, Forrest, Derek, additional, Gallagher, Anthony G., additional, and McGee, Hanna, additional

Published
1991
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43. The Differential Reinforcement of Incompatible Responses in the Reduction of Self-Injurious Behaviour: A Pilot Study.

Author

Jones, Robert S. P. and Baker, L. J. V.

Abstract

The latency of the self-injurious behaviour of a severely handicapped, Down's-syndrome boy, aged 9 years, was increased by a factor greater than three. Vibration was presented as the reinforcer in a discrete-trial, DRI-schedule procedure in which the incompatible response was physically prompted. A single-subject, ABAB design was used. It is suggested that the DRI schedule used in this way is a valuable initial procedure for decreasing self-injurious behaviour to a level where other procedures may then be applied. [ABSTRACT FROM PUBLISHER]

Published
1988
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44. Sensory Reinforcement with Autistic Children.

Author

Baker, L. J. V. and Milner, Yvonne

Abstract

Three non-verbal, autistic boys of 9, 12 and 16 years served as subjects in two experiments and a nurse play-therapist acted as the agent. The first experiment compared the effects upon a motor coordination task of each subject's preferred sensory reinforcer with those of the sensory reinforcer preferred by the other two subjects. On-task performances were maintained by prompting and by contingent presentation of each reinforcer in a multiple-baseline design across subjects. All subjects showed higher levels of on-task performance for their preferred sensory activity. In the second experiment a multielement-baseline design compared the effects of the preferred sensory reinforcer with those of a preferred edible reinforcer. All subjects showed higher levels of on-task performance for their preferred sensory activity. Inter-observer reliability remained above 90%. A role for sensory reinforcement in training autistic children is suggested. [ABSTRACT FROM PUBLISHER]

Published
1985
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47. Adducts of GaI3and InI3with Ph3P and Ph3As

Author

Baker, L.-J., Kloo, Lars A., Rickard, Clifton E.F., and Taylor, Michael J.

Abstract

Adducts Ph3PGaI3and Ph3AsGaI3obtained by adding the ligands to Et2OGaI3have been investigated by 71Ga NMR, IR/Raman spectroscopy and X-ray diffraction. Et2OInI3with Ph3P gives (Ph3P)3(InI3)2. Ph3As yields (Ph3As)3(InI3)2· H2O as rhombohedral crystals whose structure was solved by X-ray diffraction. Both these indium complexes contain Ph3EInI3molecules alongside five-coordinate adducts (Ph3E)2InI3with the Ph3E ligands attached in axial sites by long and unequal bonds to a planar InI3unit. Vibrational assignments are made for Ph3PGaI3, Ph3AsGaI3, Ph3EInI3and (Ph3E)2InI3(E = P or As).

Published
1997
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48. Effect of nitrogen on interactions between ryegrass mosaic virus (RMV) and Loliumspecies in mixed swards

Author

BAIN, R A, RAYNOR, E L, BAKER, L J, and BAGNALL, A.

Abstract

The effect of rate of nitrogen applied to three Lolium perenne-basedfield swards on the development of RMV symptoms and on the impact of the virus on the growth and composition of the swards was examined over two growing seasons. Glasshouse experiments investigated the competition between Loliumspp. in relation to RMV infection and rate of nitrogen. In general, there was a higher incidence of RMV symptoms at the higher rates of nitrogen but the relationship was not consistent in all experiments. RMV infection only significantly reduced the cumulative total yield of the sward that contained the very susceptible Lolium multiflorumcv. Barverdi and was treated with the higher rate of nitrogen. However, yield losses were consistently greater at the higher rates of nitrogen. RMV altered the relative yields of sward components and the effect was greatest after an extended period of severe frost at the end of 1995. There is evidence that the frost severely restricted the yield of RMV-infected L. multiflorumtillers in 1996. Where RMV reduced the yield of susceptible species, there was significant compensatory growth by less susceptible companion species, i.e. L. perenneand Phleum pratense, but the compensation was generally incomplete, resulting in reduced yields for virus-infected swards. RMV had no significant effect on the overall quality of the three field swards but for cv. Barverdi grown in the glasshouse it significantly reduced the percentage organic matter and water soluble carbohydrate, and D value. The reductions were greater at the higher rates of nitrogen.

Published
1998
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49. Book reviews

Author

Baker, L. J. V. and Kentridge, R. W.

Abstract

Blackman, D.E., & Lejeune, H. (Eds.) (1990). Behaviour analysis in theory and practice: Contributions and controversies. Hove: Lawrence Erlbaum Associates Ltd, pp. x + 317. ISBN 0-86377-144-0. £29.95.Davis, J.L., & eichenbaum, H. (Eds.). (1991). Olfaction: A model system for computational neuroscience. Cambridge, MA: MIT Press. Pp. 319. ISBN 0-262-04124-3. £49.50 (hardback).

Published
1992
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