Hartley

Weld Defects Recognition Using the Digital Hartley Transform. 

An invariant pattern recognition method, based on the Hartley transform, and applied to radiographic images, containing different types of weld defects, is presented. Practical results show that this method is capable to describe weld flaws into a small feature vectors, allowing their recognition automatically by the inspection system we are realizing. 

Table 1 Three Hartley feature vectors of the weld defect of figure 3.b.

G. S. Hartley, Aqueous Solutions of Parajfin-Chain Salts, Hermann et Cie, Paris, 1936. 

The early Hartley model [2, 3] of a spherical micellar stmcture resulted, in later years, in some considerable debate. The self-consistency (inconsistency) of spherical symmetry witli molecular packing constraints was subsequently noted [4, 5 and 6]. There is now no serious question of tlie tenet tliat unswollen micelles may readily deviate from spherical geometry, and ellipsoidal geometries are now commonly reported. Many micelles are essentially spherical, however, as deduced from many light and neutron scattering studies. Even ellipsoidal objects will appear... 

Hartley G S 1935 The applioation of the Debye-Huokel theory to oolloidal eleotrolyte Trans. Faraday Soc. 31 31-50... 

Hartley, F. R. Burgess, C. Alcock, R. M. Solution Equilibria., Ellis Horwood Limited Chichester, 1980 pp 249-274... 

In the case of ozone, for which both the Hartley and Huggins systems are very broad showing no rotational and very little vibrational structure, the two wavelengths must be more widely separated. 

Azobenzene [103-33-3] M 182.2, m 68", pK 2.48. Ordinary azobenzene is nearly all in the transform. It is partly converted into the cw-form on exposure to light [for isolation see Hartley J Chem Soc 633 1938, and for spectra of cis- and /ran5-azobenzenes, see Winkel and Siebert Chem Ber 74B 6707947]. trans-Azobenzene is obtained by chromatography on alumina using 1 4 benzene/heptane or pet ether, and crystd from EtOH (after refluxing for several hours) or hexane. All operations should be carried out in diffuse red light or in the dark. 

F. R. Hartley (ed.) Chemistry of the Platinum Group Metals, Elsevier, Amsterdam, 1991, 642 pp. 

Hartley and Dobbie to conclude that it existed in the oxo form 28. 

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