Results 251 to 260 of about 1,106,018 (303)

Cooling Rates During Flash Cooling

Journal of Applied Crystallography, 1998
Flash cooling of macromolecular crystals was investigated by measurement of the cooling rates achieved by different cryoprotectant solutions (glycerol, sucrose and polyethylene glycol) with different sample volumes (0.2–0.8 mm3) and by different cooling agents (cold nitrogen or helium gas, liquid nitrogen and liquid propane).
T. Y. Teng, K. Moffat
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Plunge‐cooling of tissue blocks: determinants of cooling rates

Journal of Microscopy, 1985
SUMMARYTissue blocks have been plunged into a liquid coolant and the resultant ice‐crystal damage is discussed. Some blocks have been frozen without apparent ice‐crystal damage; they were not treated with cryo‐protectants but were mounted on streamlined foil supports which separated the specimen from the thermal mass of the support pin.
K P, Ryan, D H, Purse
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COOLING RATES OF FOODS

Journal of Milk and Food Technology, 1973
Rapid cooling is essential to prevent multiplication of microorganisms in potentially hazardous foods. This requirement is frequently not met with viscous foods in large containers. The time required to cool an 8-gal container of white sauce from 105 to 57 F was 25 hr.
R. W. Dickerson, R. B. Read
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Cool! Rates of Heating and Cooling

Journal of Chemical Education, 2007
In this Activity, students measure and graph the rate of warming for a chilled thermometer bulb held in room temperature air, for a chilled bulb held between two fingers, and for a few milliliters of chilled water. Students are familiar with the everyday phenomena of warming, but measurement affords the unexpected result that the process is not linear.
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Cooling rates in splat cooling

Materials Science and Engineering, 1967
Abstract Calculations and experimental observations made on cooling rates during splat quenching are presented. Three possible types of cooling behavior are discussed: ideal cooling, intermediate cooling and Newtonian cooling. The effects of splatting-process variables on the cooling rates are described, the most important of these variables being ...
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On crystal size and cooling rate

Journal of Microscopy, 1986
SUMMARYA theoretical model is proposed which is used to derive a quantitative relationship between the critical cooling rate and average crystal size at any location within a biological specimen of given shape subject to rapid freezing. The model is applicable to the slamming, plunging or spraying methods of cryofixation provided the ice crystal size ...
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Sizes of crystallites as a function of cooling rate

Scripta Metallurgica et Materialia, 1994
The effect function model of phase transitions has been applied to the process of crystallization of the segregating solid solutions Pb[sub 1[minus]x]Sn[sub x]Te and Ge[sub 1[minus]x]Si[sub x] in order to determine the values of the maximum sizes of crystallites and the effective diffusion coefficients for the liquid phase.
Bakin, A.S.*, Romanenko, V.N.**, Schilz, J., Nikitina, G.V.*, Ivanov, D.I.**   +4 more
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Statically controlled cooling rate device

Cryobiology, 1979
Abstract A new statically controlled cooling rate device consists of metal plates and insulators which can be modified so as to control heat flow and achieve a considerable range of specific cooling rates. It can thus be adapted to give the desired cooling rates for the cryopreservation of various biological materials.
J H, Pert, G, Dayian
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Cryocrystallography: effect of cooling medium on sample cooling rate

Journal of Applied Crystallography, 1998
The rates of cooling of small samples with cold N2gas (100 K), liquid N2(77 K) and liquid propane (100 K) have been measured. The samples were one bare Cu-constantan thermocouple and one coated with a 0.25 mm layer of silicone rubber cement. Gas cooling yielded the lowest rate, liquid N2the highest.
Linda J. Walker, Phillip O. Moreno, Håkon Hope   +2 more
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Edge Weld Cooling Rates

Transactions of the Canadian Society for Mechanical Engineering, 1983
Numerical modelling techniques are used to investigate the effect of heat source shape on the cooling rate (at 700 C) of edge welds. Cooling rates are determined for point, line, planar and volume heat sources. These, in turn, are compared to experimental values and to cooling rates calculated by the traditional Adams[1] relationship where the heal ...
A.S. Oddy, M.J. Bibby
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