Flash photographic method

Chandra and Avedisian 411] studied the collision dynamics of a liquid (n-heptane) droplet on a polished, solid, stainless steel surface, and on a liquid film created by deposition of a preceding droplet using a flash photographic method. They presented a comprehensive series of clear images of droplet shape, morphology, and structure during the deformation process. In their experiments, the... 

The pulse radiolysis method has been described in detail in some of the early papers (22, 22), in a brief review of the subject (23), and in a current comprehensive review (14). It is, in brief, a fast reaction method in which the external perturbation applied to the system is a microsecond pulse of electrons. The current is sufficiently high to produce an instantaneous concentration of transient species high enough to be observed by fast measurement of the optical absorption. Spectra may be recorded either photographically or spectrophotometrically. The kinetics are studied by fast spectrophotometry. Since a perturbing pulse as short as 0.4 /xsec. has been used, the time resolution has approached 10-7 sec. The flash photolysis method used in some of the other studies (27, 15) has been reviewed in detail (24). 

The determination of the maximum detonation pressure pi, in equation (2d) has been studied by X ray measurements. While the detonation velocity can be measured directly by electronic recorders or by the - Dautriche Method, there is no direct measurement possibility for the fume velocity W, but it can be estimated by the flow off angle of the fumes behind the wave front this angle can be taken from X ray flash photographs. The relation between Dand M/is... 

More recently, sensitivity quite comparable to that afforded by the line source method has been obtained by timed flash photographic spectroscopy, by which the rate of appearance of OH in the shock-wave decomposition of HgO vapour was reinvestigated. Values of A over the instrumental slit function, averaged for several lines, are included in Fig. 2.3. 

Inhibited grades of 1,1,1-trichloroethane are used in hundreds of different industrial cleaning appHcations. 1,1,1-Trichloroethane is preferred over trichloroethylene or tetrachloroethylene because of its lower toxicity. Additional advantages of 1,1,1-trichloroethane include optimum solvency, good evaporation rate, and no fire or flash point as determined by standard test methods. Common uses include cleaning of electrical equipment, motors, electronic components and instmments, missile hardware, paint masks, photographic film, printed ckcuit boards, and various metal and certain plastic components during manufacture (see Metal surface treatments). 

Optical Method for Testing Caps consists in photographing the flashes produced on explosion. (Compare with Flame Test). Refs l)H.E.Brownsdon, JSCI 24, 381(1905) 2)W.D.Borland, JSCI 25, 241(1906) 3)Reilly (1938),70... 

G) Flash Photography. It is the method of photographing objects with the aid of illumination produced by a flash. The flash may be produced by nonelectric, electric or electronic sources. A "nonelectric flash may be produced by various "flash powders, such as of Mg(Ref 8a) by detonation of a small expl chge, such as of Pentoiite (Ref 18,pp 54—5) by explosively shocked argon gas (Ref 32) or by other methods (Ref 31,PP... 

Highly accurate trajectory information is required in the development of a missile system. One method of obtaining this information for a missile at high altitudes is to photograph the flash produced by a photoflash cartridge ejected a distance sufficient to prevent damage to the missile in flight. A device was developed which produces a series of flashes with a known time interval between them (Ref 3)... 

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