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144 results on '"Campbell, M. D."'

3. The distribution of weathering and erosion on an inselberg-pediment system in semi-arid central Sudan

Author

Campbell, M. D.

Subjects
551.4
Abstract

A number of geomorphic studies were conducted on Jebel Arashkil, an inselberg and pediment complex in central Sudan. The various explanations of inselbergs are summarised and some testable hypotheses formulated. The environment of central Sudan is described and its variability emphasised. The morphology of the inselberg is described and the slopes analysed using Rock Mass Strength criteria. The inselberg slopes are not simply controlled by bedrock strength characteristics and clearly have a developmental history. Data are also presented concerning drainage density, infiltration capacities and the nature of surface material for the inselberg and pediment. Field and laboratory techniques are used to assess spatial patterns in the nature and intensity of weathering. The techniques employed include descriptive analysis, x-ray diffraction of clay minerals, abrasion pH, quartz:felspar ratios, SEM analysis of quartz grains and gypsum weathering tablets. Weathering indices are produced which show that the most intense weathering is taking place on the inselberg slopes. This is due to both concentration of water and rate of throughput. The concentration of runoff and solution in regolith pockets on the slopes enhances slope microrelief. Schmidt hammer 'R' values were similar for all exposed bare rock surfaces regardless of location. Erosion measurements using simple repeat survey techniques show that significant erosion occured near the break of slope, mainly through headward growth of and lateral erosion by ephemeral gullies. Vertical incision and planar wash are insignificant in comparison. The form of the inselerg is due to the local balances between erosion and weathering and does not require novel explanations. Inselbergs have long evolutionary histories, and may be subject to equifinality.

Published
1991

5. Global Ground-Based Electro-Optical and Radar Observations of the 1999 Leonid Shower: First Results

Author

Brown, P., Campbell, M. D., Ellis, K. J., Hawkes, R. L., Jones, J., Gural, P., Babcock, D., Barnbaum, C., Bartlett, R. K., Bedard, M., Bedient, J., Beech, M., Brosch, N., Clifton, S., Connors, M., Cooke, B., Goetz, P., Gaines, J. K., Gramer, L., Gray, J., Hildebrand, A. R., Jewell, D., Jones, A., Leake, M., Leblanc, A. G., Looper, J. K., Mcintosh, B. A., Montague, T., Morrow, M. J., Murray, I. S., Nikolova, S., Robichaud, J., Spondor, R., Talarico, J., Theijsmeijer, C., Tilton, B., Treu, M., Vachon, C., Webster, A. R., Weryk, R., Worden, S. P., Jenniskens, Peter, editor, Rietmeijer, Frans, editor, Brosch, Noah, editor, and Fonda, Mark, editor

Published
2000
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20. Global Ground-Based Electro-Optical and Radar Observations of the 1999 Leonid Shower: First Results

Author

Brown, P., Campbell, M. D., Ellis, K. J., Hawkes, R. L., Jones, J., Gural, P., Babcock, D., Barnbaum, C., Bartlett, R. K., Bedard, M., Bedient, J., Beech, M., Brosch, N., Clifton, S., Connors, M., Cooke, B., Goetz, P., Gaines, J. K., Gramer, L., Gray, J., Hildebrand, A. R., Jewell, D., Jones, A., Leake, M., Leblanc, A. G., Looper, J. K., Mcintosh, B. A., Montague, T., Morrow, M. J., Murray, I. S., Nikolova, S., Robichaud, J., Spondor, R., Talarico, J., Theijsmeijer, C., Tilton, B., Treu, M., Vachon, C., Webster, A. R., Weryk, R., and Worden, S. P.

Published
1998

29. Algorithm that delivers an individualized rapid-acting insulin dose after morning resistance exercise counters post-exercise hyperglycaemia in people with Type 1 diabetes

Author

Turner, D., primary, Luzio, S., additional, Gray, B. J., additional, Bain, S. C., additional, Hanley, S., additional, Richards, A., additional, Rhydderch, D. C., additional, Martin, R., additional, Campbell, M. D., additional, Kilduff, L. P., additional, West, D. J., additional, and Bracken, R. M., additional

Published
2015
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30. Similar magnitude of post‐exercise hyperglycemia despite manipulating resistance exercise intensity in type 1 diabetes individuals

Author

Turner, D., primary, Gray, B. J., additional, Luzio, S., additional, Dunseath, G., additional, Bain, S. C., additional, Hanley, S., additional, Richards, A., additional, Rhydderch, D. C., additional, Ayles, M., additional, Kilduff, L. P., additional, Campbell, M. D., additional, West, D. J., additional, and Bracken, R. M., additional

Published
2015
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35. Red snapper management in the Gulf of Mexico: science- or faith-based?

Author

Cowan, J. H., primary, Grimes, C. B., additional, Patterson, W. F., additional, Walters, C. J., additional, Jones, A. C., additional, Lindberg, W. J., additional, Sheehy, D. J., additional, Pine, W. E., additional, Powers, J. E., additional, Campbell, M. D., additional, Lindeman, K. C., additional, Diamond, S. L., additional, Hilborn, R., additional, Gibson, H. T., additional, and Rose, K. A., additional

Published
2010
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36. Thermophysical properties data on graphite/polyimide composite materials

Author

Campbell, M. D and Burleigh, D. D

Subjects
Composite Materials
Abstract

Experimental data for the thermal conductivity, thermal expansion, specific heat, and emittance of laminates of HTS/NR 150B2 and HTS/PMR 15 are presented. Measurements were made over the temperature range 116 K to 588 K. Results for the two materials were similar with some differences attributable to laminate quality. Higher expansion coefficients for the HTS/PMR 15 specimens in the resin-dominated directions indicate a higher coefficient for PMR 15 than NR 150B2. Previously announced in STAR as N80-14197

Published
1982

37. Thermophysical properties data on graphite/polyimide composite materials

Author

Campbell, M. D and Burleigh, D. D

Subjects
Composite Materials
Abstract

Experimental data for the thermal conductivity, thermal expansion, specific heat, and emittance of laminates of HTS/NR 150B2 and HTS/PMR 15 are presented. Measurements were made over the temperature range 116 K to 588 K. Results for the two materials were similar with some differences attributable to laminate quality. Higher expansion coefficients for the HTS/PMR 15 specimens in the resin-dominated directions indicate a higher coefficient for PMR 15 than NR 150B2.

Published
1979

42. Evidence for transverse spread in Leonid meteors

Author

LeBlanc, A. G., primary, Murray, I. S., additional, Hawkes, R. L., additional, Worden, P., additional, Campbell, M. D., additional, Brown, P., additional, Jenniskens, P., additional, Correll, R. R., additional, Montague, T., additional, and Babcock, D. D., additional

Published
2000
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47. Cyclic AMP inhibits inositol polyphosphate production and calcium mobilization in neuroblastoma X glioma NG108-15 cells.

Author

Campbell, M D, Subramaniam, S, Kotlikoff, M I, Williamson, J R, and Fluharty, S J

Abstract

In the neuroblastoma X glioma hybrid cell line NG108-15, bradykinin (BK) receptor stimulation induced a rapid and concentration-dependent rise in cytosolic free Ca2+ levels, as measured with the Ca2(+)-sensitive fluorescent dye fura-2. The Ca2+ transient was present in the absence of extracellular Ca2+ and was associated with a concentration-dependent production of inositol phosphates, particularly inositol trisphosphate (InsP3). Pretreatment of intact NG108-15 cells with forskolin or dibutyryl-cAMP plus isobutylmethylxanthine reduced BK-stimulated InsP3 production and the increase in cytosolic free Ca2+. Membranes prepared from forskolin- and [3H]inositol-pretreated NG108-15 cells also showed a diminished production of InsP3 elicited by guanosine 5'-[gamma-thio]triphosphate, NaF, or BK plus GTP. On the other hand, the Ca2+ sensitivity of membrane-associated phosphoinositide-specific phospholipase C (PI-PLC) was unaffected by forskolin pretreatment of intact NG108-15 cells. Collectively, these results suggest that A-kinase may inhibit receptor-mediated and postreceptor stimulation of PI-PLC in neuron-like cells, perhaps by impairing the coupling between a guanine nucleotide-binding protein and PI-PLC.

Published
1990

48. A Prediction Equation for Vegetation Effects on Water Yield from Watersheds in Arid Areas

Author

Grover, B. L., Campbell, C. B., and Campbell, M. D.

Abstract

A water yield prediction equation based on plant type, water use profiles, and historic precipitation records is presented. The equation can be set at any desired probability value. Yields predicted for sites occupied by deep‐rooted brush species average 14 cm less per year than those for sites occupied by a grass‐forb complex. This pattern holds for central Utah watersheds higher than 2,330 m above mean sea level in 4 out of 5 years.

Published
1970
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49. Mutual Funds.

Author

CAMPBELL, M. D., E. D., GROSS, EUGENE, ALTOBELLI, ANTHONY, and GROSS, SHERMAN W.

Subjects
BALANCED funds, MUTUAL funds, SECURITIES
Abstract

A letter to the editor in response to an article in the August 15, 1959 issue is presented.

Published
1959

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