AbstractAluminium alloys have been the predominant choice of material used in the construction of civil and military aircraft since World War II. They are, however, subject to competition from other materials, particularly titanium and carbon fibre reinforced composite. Some of the developments that have occurred with conventional alloys are considered and the limitations to further exploitation are defined in terms of availability, cost, structural efficiency, and compatibility with existing manufacturing technology. Some new prospects for aluminium-base materials are considered, including conventional alloys, metal matrix composites, and powder alloys.MST/568

Airframe

10.1179/mst.1986.2.12.1169

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Prediction of Crude Protein and Amino Acid Passage to the Duodenum of Lactating Cows by Models Compared with In Vivo Data

Journal of Dairy Science (2001)

H.G. Bateman J.H. Clarkand R. A. Patton C. J. Peel C.G. Schwab

Animal model

10.3168/jds.s0022-0302(01)74521-3

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Citations (16)

Advances in Aerospace Materials and Structures

C. J. Peel

This paper reviews the status of selected aerospace materials currently under development or moving to application and assesses the difficulties inherent in their transition from research to commercial use, in particular those factors affecting affordability.

10.1002/3527606025.ch30

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Citations (14)

The effects of long-term administration of bovine growth hormone on the lactational performance of identical-twin dairy cows

Animal Science (1985)

C. J. Peel L. D. Sandles Kaylene J. Quelch Adrian C. Herington

ABSTRACT The effect of chronic administration of bovine growth hormone (GH) on milk production, food intake and live-weight change was evaluated in five sets of monozygotic twin cows on pasture. Purified bovine pituitary GH (specific activity, 0·78 IU/mg) was administered by daily subcutaneous injections (39 IU/day) for a period of 22 weeks (weeks 5 to 26 of lactation). GH treatment resulted in significantly higher yields of milk (23·3 kg/day), fat (0·97 kg/day), protein (0·74 kg/day) and lactose (115 kg/day) compared with the control group (19·8 kg/day, 0·79 kg/day, 0·63 kg/day, 0·99 kg/day). Milk composition did not differ between treatment groups. There was no difference in the intake of cut grass in week 8 but the voluntary intake of the GH group had increased by week 22 (controls, 15·4 kg dry matter (DM) per day and GH group, 17·5 kg DM per day). There were no differences in the rate of live-weight change for the two groups. Serum somatomedin concentrations were significantly elevated in the GH group on weeks 20 to 22 of treatment (0·043 v . 0·135 U/ml). This experiment indicates that cows chronically treated with GH were able to adjust their food intake upwards to sustain a substantial increase in milk production on a diet composed solely of grass.

Bovine somatotropin

10.1017/s0003356100027781

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Citations (107)

Effect of Bovine Somatotropin on Metabolism of Lactating Dairy Cows: Energy and Nitrogen Utilization as Determined by Respiration Calorimetry

Journal of Nutrition (1988)

H.F. Tyrrell A.C.G. Brown Paul J. Reynolds G. L. Haaland Dale E. Bauman

Bovine somatotropin

Nitrogen balance

10.1093/jn/118.8.1024

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Citations (94)