First-order derivative values were significantly greater in the short normal group than in the short slowly growing children short normal median 1. Sixty-four short prepubertal children 48 male, 16 female aged between 4. Thirty-three children were growing with a height velocity standard deviation score less than Usage[ edit ] Oil cooling is commonly used to cool high-performance motorcycle engines that are not liquid-cooled. Cooling water can be corrosive to the engine and must contain a rust-inhibitor , whereas oil naturally helps to prevent corrosion. An analysis of parameters of occupancy percentage and rate of change of serum GH concentration was performed as part of a prospective study investigating the relationship between growth and GH in childhood. Oil is an electrical insulator , thus it can be used inside of or in direct contact with electrical equipment such as in transformers.
Occupancy percentage played no part in the relationship. Usage[ edit ] Oil cooling is commonly used to cool high-performance motorcycle engines that are not liquid-cooled. OC5 values were lower in short normal children median 0. First-order derivative values were significantly greater in the short normal group than in the short slowly growing children short normal median 1. Oil is an electrical insulator , thus it can be used inside of or in direct contact with electrical equipment such as in transformers. Oil is already present as a lubricant, so no extra coolant tanks, pumps nor radiators are required although all of these items may need to be larger than otherwise. While descending, the plane's airspeed rises, substantially increasing the rate of air-cooling the engine. Therefore, water may be a better coolant if an engine is permanently producing large amounts of heat, making it better for high-performance or racing engines. Pure water may evaporate or boil, but it cannot degrade, although it may become polluted and acidic. If air-cooling proves sufficient for much of the running time such as for an aero-engine in flight, or a motorcycle in motion , then oil cooling is an ideal way to cope with those times when extra cooling is needed such as an aero-engine taxying before take-off, or a motorcycle in a city traffic jam. Twenty-four hour serum GH concentration profiles were constructed by withdrawing samples at minute intervals. Analysis of occupancy percentage was performed on each data array by determining cumulative distributions and plotting these as linear probits against log serum GH concentration. A first-order derivative of the concentration-time data array was determined for each profile as a measure of rate changes. Sixty-four short prepubertal children 48 male, 16 female aged between 4. These factors may cause the cylinder head to crack; but the adoption of oil-cooled cylinder heads significantly reduces or cancels the problem as the heads are now "oil-warmed". Thus, if through a gasket failure, coolant oil should enter, say, the combustion chamber or the sump, this would be a mere inconvenience; but if coolant water should similarly leak, substantial engine damage might occur. Typically, the cylinder barrel remains air-cooled in the traditional motorcycle fashion, but the cylinder head benefits from additional cooling. Although occupancy percentages at differing serum GH concentrations differ between short slowly growing and short normal children, it is the rate of change of the hormone in the circulation which appears to be the more important 'signal' in terms of modulating growth. As there is already an oil circulation system available for lubrication, this oil is also piped to the cylinder head and used as a liquid coolant. During descent, very little power is needed, so the engine is throttled back and thereby develops much less heat than when maintaining altitude. This spoon would dip into sump oil and would hurl oil about, in the hope of cooling and lubricating the underside of the piston. The most important factor in determining growth rate was the rate of change in serum GH concentration FOD. Water is generally available should coolant need to be added to the system, but oil may not be. Thirty-one children were growing with a height velocity standard deviation score between 0 and There was no difference in OC50 values. Some slow-turning early engines would have a "splashing spoon" beneath the big end of the connecting rod. These data suggest that the pattern of presentation of GH in the circulation is an important factor in determining target organ response.
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