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Your search keyword '"Griffiths, J. R."' showing total 551 results
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551 results on '"Griffiths, J. R."'

27. Flow system studies of the reactions of free radicals

Author

Griffiths, J. R.

Subjects
541.39
Abstract

The technique of discharge-flow is employed for a mechanistic study of the reactions of hydrogen atoms with propylene and with propane. On-line analysis is by gas chromatography, and reaction product distributions are obtained for varying conditions of hydrogenatom flow and temperature. The complete mechanism for either reaction is input into a computer program using "known" rate constant values; product distributions thus obtained by numerical integration are compared with experimental values. Evaluation of such data and manipulation of certain rate constant values provide an iterative procedure whereby a "best fit" to experiment is obtained. Rate constant values for each step of both mechanisms are tabulated. The validity of the mechanisms themselves, which are established in the literature, is substantiated in this study.

Published
1979

31. MRS studies of cancer

Author

Griffiths, J. R., Maxwell, R. J., Howells, S. L., Howe, F. A., Robinson, S. P., Stubbs, M., McCoy, C. L., Rodrigues, L. M., Parkins, C. L., and Chaplin, D. J.

Published
1994
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37. Magnetic resonance neurography

Author

Filler, A. G., Howe, F. A., Hayes, C. E., Kliot, M., Winn, H. R., Bell, B. A., Griffiths, J. R., and Tsuruda, J. S.

Published
1993

39. Food webs under changing biodiversity - Top-down control

Author

Winder, Monika, Asterhag, E., Bernreuther, M., Blenckner, T., Bonaglia, S., Bonsdorff, E., Brüchert, V., Burian, A., Dierking, Jan, Downing, A., Dutz, J., Grinienė, E., Fey, D. P., Griffiths, J. R., Gardmark, A., Hajdu, S., Hammer, C., Herrmann, J. P., Hjerne, O., Hoikkala, L., Hänselmann, K., Järnström, M., Karlsson, O., Kadin, M., Kortelainen, P., Kotterba, P., Kuosa, H., Kotta, J., Larsson, U., Lindegren, M., Lundström, K., Margonski, P., Moll, D., Möllmann, C., Nascimento, F., Neuenfeldt, S., Niiranen, S., Nordström, M. C., Norkko, A., Olsson, D. J., Peck, M. A., Peters, J., Renz, J., Polte, P., Sulcius, S., Soinne, H., Oesterwind, Daniel, Szkudlarek-Pawelczyk, A., Tamelander, T., Temming, A., Törnroos, A., Vaniala, A., Weigel, B., and Zydelis, R.

Subjects
fungi, 14. Life underwater, sense organs, 15. Life on land, skin and connective tissue diseases, geographic locations
Abstract

Report on effects of changing predation pressure on benthic and pelagic species

Published
2016

40. Fatigue properties of a semi-solid cast Al-7Si-0.3Mg-T6 alloy

Author

Badiali, M., Davidson, C. J., Griffiths, J. R., and Zanada, A.

Subjects
equipment and supplies
Abstract

The room temperature fatigue properties of a semisolid cast A356 alloy have been defined by determining a Wšhler curve for lives between 104 and 107 cycles. The fatigue tests were carried out in axial tension/compression cycling at zero mean stress (stress ratio, R, of -1). The initiation sites of the fatigue cracks were studied in detail and it was observed that cracks generally initiated from shrinkage pores or oxide films at the surfaces of the machined fatigue specimens. Measurements of the sizes of these defects are reported, and evidence is presented to suggest that oxide defects have less effect on the fatigue life than shrinkage pores of the same size, presumably reflecting differences in the ease of fatigue crack initiation at the two types of defects. The fatigue properties of our particular semisolid castings are compared with those of casting made by other processes. It is shown that the semisolid castings performed slightly better than squeeze castings made in our laboratory using the same machine and the same die. The properties of both the semisolid and squeeze castings are significantly better than those of gravity diecastings.

Published
2013

48. Sensitivity of quantitative ¹H magnetic resonance spectroscopy of the brain in detecting early neuronal damage in systemic lupus erythematosus

Author

Axford, J S., Howe, F A., Heron, C, and Griffiths, J R.

Subjects
Diagnosis, Complications and side effects, Systemic lupus erythematosus -- Complications and side effects -- Diagnosis, Brain diseases -- Diagnosis -- Complications and side effects, Magnetic resonance imaging
Abstract

Objective--To quantify N-acetylaspartate (NAA), total creatines (tCr), total cholines (tGho), and myo-inositol (mI) levels in normal and abnormal appearing white matter of patients with neuropsychiatric systemic lupus erythematosus (NPSLE) in [...]

Published
2001

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