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  • 1
    Electronic Resource
    Electronic Resource
    Liebenau, J.: The Challenge of New Technology: Innovation in British Business since 1850 : Aldershot, Gower, 1988 (1989)
    Cambridge : Cambridge University Press
    The @British journal for the history of science 22 (1989), S. 248-249 
    Details
    ISSN: 0007-0874
    Source: Cambridge Journals Digital Archives
    Topics: History , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0007087400026066
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Edwards, C. T.: Public Finances in Malaya and Singapore : Canberra, Australian University Press, 1970 (1975)
    Cambridge : Cambridge University Press
    Modern Asian studies 9 (1975), S. 278-279 
    Details
    ISSN: 0026-749X
    Source: Cambridge Journals Digital Archives
    Topics: Ethnic Sciences , History , Political Science , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0026749X00005059
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  • 3
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    Inertial impaction of heavy molecules (1984)
    Cambridge University Press
    Details
    Publication Date: 1984-12-01
    Description: The transition from diffusion-dominated to inertia-dominated behaviour in the transport of condensable heavy molecules carried in a continuum subsonic He jet that impinges on a solid surface is studied experimentally. The Stokes number S, or ratio between the heavy-molecule relaxation time and the fluid-dynamic time, is varied in the interval 0 ≲S ≲ 1 by changing the jet Mach number at a constant value of the Reynolds number. Although the heavy species departs considerably from equilibrium at all but the smallest values of S, the helium jet is always near equilibrium conditions. At values of S of order unity the observed rate of deposition at the stagnation point asymptotes to a value some six times greater than in the diffusion region (where S →0), implying that the process is governed by the large inertia of the heavy species, very much like in aerosol impactors. As a result, it is argued that the concept of pressure diffusion is unsuitable to explain the observed behaviour. An approximate theoretical description of the transport process is given for the region S ≪ 1 where the kinetic problem is amenable to a hydrodynamic treatment. Finally, the analogy with the inertia-dominated behaviour of aerosols is used to assess the relative merits of various aerodynamics schemes aiming at separating isotopes. © 1984, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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  • 4
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    Exercise Musk-ox, 1946 (1947)
    Cambridge University Press
    Details
    Publication Date: 1947-12-01
    Description: Exercise Musk-ox was no isolated adventure, but the culminating test of several years of wartime work. In it, vehicles, equipment, and techniques of training and of air-supply, secretly developed during the war, were given an open test to ascertain their usefulness in northern Canada. Because the public had not been aware of this secret work by the services, Exercise Musk-ox was hailed by them as a new idea, but it would not have been possible had not the equipment and methods all been ready and proven before tbe close of the war.So great had been these wartime improvements that none of those men best acquainted with the north country and with older methods of transportation believed that the ground party had any chance of driving 2600 miles without roads across the Arctic and sub-Arctic in less than 2½ months. Neither was it generally realised that the military purposes had already been served and that this was no tactical exercise but a demonstration of the soundness of military development and an experiment in applying it to peaceful pursuits in the Canadian Arctic.
    Print ISSN: 0032-2474
    Electronic ISSN: 1475-3057
    Topics: Ethnic Sciences , Geography
    Published by Cambridge University Press
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  • 5
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    An experiment to measure the recombination rate of oxygen (1963)
    Cambridge University Press
    Details
    Publication Date: 1963-04-01
    Description: The feasibility of an experiment to measure the recombination rate of oxygen is examined using the ideal-dissociating-gas model. The experiment is to be performed in a shock tube, the shock-heated (and dissociated) gas being cooled by passing it through a Prandtl-Meyer expansion, and then allowed to recombine in a constant-area channel. At appropriate densities and shock Mach numbers it is found that recombination takes place in a distance suitable for a laboratory experiment. Using this technique, the recombination rate of oxygen has been measured at 2700°K. To determine the recombination rate, the absorption of ultraviolet light at a wavelength of 2283 Å measured 11 cm downstream of the expansion was compared with absorptions calculated for various values of the recombination rate constant. The measured value of the recombination rate constant of oxygen is in agreement with values calculated from dissociation rate measurements. © 1963, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 6
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    On the structure of a class of aerothermodynamic shocks (1969)
    Cambridge University Press
    Details
    Publication Date: 1969-06-23
    Description: Some recent work on the existence of vibrational de-excitation shocks (δ-shocks) in expanding non-equilibrium nozzle flows is extended to include situations in which an adiabatic shock (δ-shocks) may be embedded within the de-excitation shock. A discussion of some further properties of the shock solution is given and some examples are worked out. Numerical solutions of the full equations are also presented. These solutions confirm the existence of the δ-shocks but bring to light certain anomalies in the simple approximate solution. The modifications necessary to remove these discrepancies are outlined, and the implications of the numerical results are briefly discussed. Finally, some comments on the nature of the asymptotic solution for an arbitrary rate process are made.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 7
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    Some statistical properties of small scale turbulence in an atmospheric boundary layer (1970)
    Cambridge University Press
    Details
    Publication Date: 1970-03-26
    Description: Derivatives of velocity signals obtained in a turbulent boundary layer are examined for correspondence to the lognormal distribution. It is found that there is rough agreement but that unlikely events at high values are much less common in the observed fields than would be inferred from the lognormal distribution. The actual distributions correspond more to those obtained from a random walk with a limited number of steps, so the difference between these distributions and the lognormal may be related to the fact that the Reynolds number is finite. The third-order structure function is examined, and found to be roughly consistent with the existence of an inertial subrange of a Kolmogoroff equilibrium reacute;gime over a range of scale which is a priori reasonable but which is far less extensive than the [formula omitted] region of the spectrum. © 1970, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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  • 8
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    Voluntary feed intake by sheep and digestibility of shaded Stenotaphrum secundatum and Pennisetum clandestinum herbage (1990)
    Cambridge University Press
    Details
    Publication Date: 1990-04-01
    Description: SUMMARYThe effects of shade (50% of ambient light transmission) on the quality of established swards of buffalo grass (Stenotaphrum secundatum) and kikuyu grass (Pennisetum clandestinum) were examined at Wollongbar Research Station, northern New South Wales. Sarlon cloth was used to shade plots of the two species, after cutting to 8 cm, from November 1985 to March 1986. Herbage was harvested from shaded and adjacent unshaded plots for chemical analyses and for feeding as dry chaff to penned sheep at the University of Queensland research farm at Mt Cotton.Shade markedly decreased the voluntary feed intake (VI) of P. dandestinum by 30·7% over the two harvests while VI of S. secundatum was not significantly affected. Shade had no effect on the in vitro and in vivo digestibility of P. clandestinum herbage but marginally increased that of S. secundatum. These shade effects resulted in a 14·2% increase for S. secundatum and a 34% decrease for P. clandestinum in the intake of digestible dry matter of shaded compared with unshaded herbage.The reduced VI of the shade-grown herbage of P. clandestinum was associated with a higher proportion of stem (21 v. 8% for unshaded herbage), a lower proportion of leaf (48 v. 54%), and a lower concentration of total nonstructural carbohydrates (TNC) (0.9 v. 2.1%). In S. secundatum, there were similar, but smaller, changes in proportion of stem and TNC percentage in shade-grown herbage but, in contrast to P. clandestinum, these potential detriments to VI were offset by an increase in proportion of leaf and a decrease in the proportion of dead material. Average moisture content of shaded herbage (76%) was higher than that of unshaded herbage (70%). Nitrogen and potassium concentrations in plant tissue were higher in the shaded herbage.The higher yielding capacity and maintenance of nutritive quality of shaded S. secundatum compared with shaded P. clandestinum indicates the potential usefulness of S. secundatum for plantation agriculture.
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Cambridge University Press
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  • 9
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    Effect of castration and dietary protein level on growth and carcass composition in beef cattle (1970)
    Cambridge University Press
    Details
    Publication Date: 1970-04-01
    Description: SUMMARYThirty-six Hereford cross Friesian calves weighing on average 82.4 kg at an average age of 90 days were allotted in randomized blocks to a 2 x 3 factorial design. Castration by the open method was performed on half the number of calves and three dietary crude protein levels, 20, 14 and 11 % in dry matter were used in a mainly cereal concentrate diet fed ad libitum individually to the animals in stalls. Slaughter was at a fixed weight of approximately 420 kg.Steers compared with bulls gained weight at a significantly slower rate and with less efficiency. Castration's greatest effect in reducing rate of gain occurred during the later stages of rearing when puberty in the bulls, as measured by a steep rise in seminal fructose, was associated with their relatively well maintained live-weight gain. The influence of testicular hormones was also apparent in the bull's carcass with its heavier head, horn and hide and significantly higher proportion of lean and lower proportion of fat in the side.Dietary protein level affected rate of gain in both bulls and steers but at each level bulls performed better than steers. With circumstances similar to those in this experiment, a 14 % crude protein level in concentrate dry matter appears adequate for both categories up to a live weight of circa 270 kg and a reduction to 11 % thereafter. The effect of protein level on tissue proportions of the side and carcass composition generally was minimal.
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Cambridge University Press
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  • 10
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    The in vitro digested cell wall and fermentation characteristics of grasses as affected by temperature and humidity during their growth (1977)
    Cambridge University Press
    Details
    Publication Date: 1977-02-01
    Description: SUMMARYTotal cell wall, in vitro digested cell wall and fermentation-gas production were determined in the separated tops and stubble of five tropical and two temperate grass species grown under controlled temperatures and humidities. As the day/night temperatures increased from 18/10 to 25/17 °C the total cell wall and in vitro digested cell wall increased. With a further increase to 32/24 °C the total cell wall increased, but not the in vitro digested cell wall. In vitro digested cell-wall values were also calculated from a previously derived relationship between in vitro digested cell wall and total cell wall. The differences between observed and calculated values increased (negatively) with increasing growth temperature suggesting that the in vitro digested cell wall was depressed with increasing growth temperatures, but the extent of this depression was small.In vitro gas production from the fermentation of plant tops or stubble in buffered rumen fluid for 24 h was significantly affected by growth temperature and humidity, apparently because of changes in chemical composition induced by the treatments. The volume of gas produced between 24 and 48 h fermentation times was appreciably lower from stubble than from plant tops and this was thought to be due to a higher resistance of part of the cell wall of stubble to digestion by rumen bacteria. Gas production in this period was slightly lower in the tops of grasses grown at the lower temperatures, but this could have been an indirect effect from an associated decrease in the total cell wall.
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Cambridge University Press
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