Heat disc-shaped

Low heat transfer very low secondary disc-shaped. 

Discoidal stress cracks Disc-shaped cracks caused by stress in a material such as amber, when it is heated and cooled. Sometimes called sun spangles or lily pads . 

In the linear heat-flow method two disc-shaped specimens are placed on either side of an electrically-heated plate and the temperature profiles across the samples are monitored by thermocouples sited on both faces of the specimens. The apparatus is well insulated to minimise heat losses. In some versions of this method, the total heat flux passing through the samples is determined... 

There is an ASTM Standard for this method [55]. If a disc-shaped sample is irradiated on one surface for a short time using a flash tube or a pulsed laser, then the curve of temperature against time for the back face depends on the thermal diffusivity of the sample and the heat losses. If the pulse time r is very much shorter than the time for the pulse to pass through the sample, then the heat losses can be ignored. Cape and Lehmann [56] have given as a criterion for this condition... 

The simultaneous measurement of heat transfer and electrochemical quantities has been described in the literature [16-18]. Tubular and disc-shaped specimens proved to be suitable although difficulties arose in obtaining uniform heat transfer on the surface. For example, it was found that crevice corrosion can occur in the side insulation of disc electrodes. This effect may be attributed in some cases to the decreased heat flux and therefore higher surface temperature on the outer circumference of the specimen. 

One of the attractive features of controlled potential separations Is that the deposit can often be used directly for radioactivity measurements (R3) An example of tailoring the shape and size of the cathode to fit a given counting requirement is shown in Figure 4l which shows the plating cell and cathode configuration employed by Harrison, Lindsey and Phillips (HI5). The disc shaped platinum cathode was pressed into a disc of heat-softened polyethylene to prevent the ThB(Pb ) from depositing onto both sides. 

The core components of the apparatus consist of one cold plate and a guarded hot plate. A sample of the fabric or insulating wadding to be tested, 330 mm in diameter and disc-shaped, is placed over the heated hot metal plate the sample is heated by the hot plate, and the temperature on both sides of the sample is recorded using thermocouples. The apparatus is encased in a fan-assisted cabinet, and the fan ensures enough air movement to prevent heat buildup around the sample and also isolates the test... 

In Fig. 20, electrocatalytic activities at room temperature are compared as function of Ru percentage at the surface, for Ru-modified Pt(lll) and UHV prepared alloy electrodes [75]. Disc-shaped PtRu alloys (Johnson-Matthey) of5 mm diameter and 2 mm thickness were polished to a mirror finish and treated in UHV by Ar sputtering and heating according to Ref. [80]. After... 

The component parts are heated. The blade shape is laid out on the hub disc and tack welded, which ensures that the blade cannot be misaligned. The hub disc with the tack welded blades are placed on the automatic impeller welding machine and heated for welding. After the blades are completely welded to the hub disc, the cover disc is welded on by the same means. The completely welded impeller is then ready for annealing and finish machining. 

The simplest kind of a fixed catalyst bed is a random packing of catalyst particles in a tube. Different particle shapes are in use like spheres, cylinders, rings, flat disc pellets or crushed material of a certain sieve fraction. Mean particle diameters range from 2 to 10 mm, the minimum diameter is limited primarily by pressure drop considerations, the maximum diameter by the specific outer surface area for mass and heat transfer. 

Dow s patented scrapless forming process is identified as the SFP process. An extruder produce a biaxially oriented sheet (Chapter 5). In turn the sheet is slit and cut into square blanks. These blanks are heated and pressed into circular disc with a lip. Immediately or latter after reheating, the disc is thermoformed into a shape such as a cup. 

The liquid in a pear-shaped flask A (Fig. 2.VIII L) is heated by a ring gas-burner B covered by a metal disc. The vapour passes down a central tube into a glass worm-condenser in the calorimeter. The actual evaporation lasts only 2 to 4 mins., the correction for heat radiated from the burner (which is screened from the calorimeter by a sheet of wood covered with wire gauze) being determined by measuring the rise in temperature in the calorimeter before the liquid boils, and after evaporation is completed. The weight of liquid condensed is determined. 

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