Heat teat

Hitze-probe, /. heat teat, -strahlung, /. heat radiation, -wirkung, /. action of heat, heat effect, thermal effect, -wirkungsgrad, m. thermal efficiency. 

Heat Teats (Thermal Stability Tests) include among others the following l)Abels or KI Test (qv) 2) American Test at 65.5° or 80° (See Ref 2 p 80 and under Surveillance Tests in this section) 3)Angeli s Test (See Ref 2, p 90 and p A 3 of this volume) 4)Bergmann-Junk Test (qv) 5)Brome s Test (Ref 2, p 88)... 

Dissolve 0-5 g. of the substance in 10 ml. of 50 per cent, alcohol, add 0-5 g. of solid ammonium chloride and about 0 -5 g. of zinc powder. Heat the mixture to boiling, and allow the ensuing chemical reaction to proceed for 5 minutes. Filter from the excess of zinc powder, and teat the filtrate with Tollen s reagent Section 111,70, (i). An immediate black or grey precipitate or a silver mirror indicates the presence of a hydroxyl-amine formed by reduction of the nitro compound. Alternatively, the filtrate may be warmed with Fehling s solution, when cuprous oxide will be precipitated if a hydroxylamine is present. Make certain that the original compound does not aflfect the reagent used. 

An alternative method of removing the aniline is to add 30 ml. of concentrated sulphuric acid carefully to the steam distillate, cool the solution to 0-5°, and add a concentrated solution of sodium nitrite until a drop of the reaction mixture colours potassium iodide - starch paper a deep blue instantly. As the diazotisation approaches completion, the reaction becomes slow it will therefore be necessary to teat for excess of nitrous acid after an interval of 5 minutes, stirring all the whUe. About 12 g. of sodium nitrite are usually required. The diazotised solution is then heated on a boiling water bath for an hour (or until active evolution of nitrogen ceases), treated with a solution of 60 g. of sodium hydroxide in 200 ml. of water, the mixture steam-distilled, and the quinoline isolated from the distillate by extrsM-tion with ether as above. 

Reibungs>messer, m. friction meter, tribometer. -messung,/. measurement of friction, -probe, / friction teat, rubbing teat, -wfirme, /. frictional heat, -wert, m. coefficient of friction. -widerstand, m. frictional reaiatance. -zahl, -ziffer,/. coefficient of friction. Reibzund-hblzchen, n. friction match. 

Inflammability Test. See Index of Inflammability Teat and under Sensitivity to Flame, Heat, Spuka, Electrostatic Discharges, etc... 

Hortham Statas Powar frtnch Island, Ul Teat in 1902 Unsuccessful electrified filter bed for PM Inadequate because awtal In tires aborted out device alao heat level In boiler too high. Yes 150,000 Ib/hr stean capacity bubbling fluidized bed retrofitted iron spreader/stoker design prlnary fuel la wood waste. References 8 and 9... 

In order to measure the velocity of a stream of air, a flat plate of length 2 cm in the flow direction is placed in the flow. This plate is electrically heated, the heat dissipation rate being uniform over the plate surface. The plate is wide so a two-dimensional laminar boundary layer flow can be assumed to exist The velocity is to be deduced by measuring the temperature of the plate at its trailing edge. If this temperature is to be at least 40°C when the air temperature is 20 C and the air velocity is 3 m/s, find the required rate of teat dissipation in the plate per unit surface area. 

Tested in, heated flask of complex with lead and carbon steel teat strips. Comparison was made with the steel corrosion. 

In this teat 4 5 g. of nitrocellulose is heated in a tube 30 cm. long and 1 4 cm. in diameter at 135 . A thermometer u fixed with Its bulb embedded in the nitrocellulose, and the heating is continued until a rise of temperature is indicated. This usually requires forty-five to sixty minutes. 

The /3-galactosidase study is an excellent example of the power of site-directed mutagenesis. Huber, Miller, and colleagues prepared and examined five Glu-461-/8-galactosidase substitutions (Asp, Gly, Gin, His, and Lys) (136, 139). All substitutions had /teat values less than 0.3% of the wild-type enzyme except the His-461 mutation, which was approximately 6%. For most of the substitutions it was possible to quantify K, /teat. s. and rates of galactosylation and degalac-tosylation for three substrates, and K values for three inhibitors. Different enzyme kinetic properties resulting from different amino acid substitutions confirm that Glu-461 is directly involved in catalysis and contributes to active site structure stability. Heat inactivation at 55°C occurred more rapidly with each amino acid substitution compared to the wild-type enzyme, except for the structurally conservative Gin substitution, which was only moderately affected. 

HEAT FLUX, Heat-transfer calculations are based on the area of the heating surface and are expressed in watts per square meter or Btu per hour per square foot of surface through which the heat flows. The rate of heat transfer per unit area is called the /teat flux. In many types of heat-transfer equipment the transfer surfaces are constructed from tubes or pipe. Heat fluxes may then be based on either the inside area or the outside area of the tubes. Although the choice is arbitrary, it must be dearly stated, because the numerical magnitude of the heat fluxes will not be the same for both, i... 

Evidence of the organic nature of the substance may, be provided by the behaviour of the compound when heated on porcelain or platinum or other comparatively inert metal (e.gr., nickel) the substance is inflammable, burns with a more or less smoky flame, chars and leaves a black residue consisting largely of carbon (compare Ignition Teat above). 

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