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Extra resources for Bird Food Recipes (Storey's Country Wisdom Bulletin A-137)

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G. H. Bishop and G. A. Bruggeman, (Paper of the "Army Materials and Mechanics Research Center"- Watertown, Massachusetts) . 5. J. Levy and C. Goux, Mem. Sci. Rev. , 64, 663, (1967). 6. J. Levy, Thesis, Paris, 1968. 7. B. Michaut, Thesis, Grenoble, 1971. ON GRAIN BOUNDARY DISLOCATION CONTRAST IN THE ELECTRON MICROSCOPE t R. W. Balluffi * * ** *** G. R. Woolhouse ** ,and Y. Komem*** Department of Materials Science & Engineering, Cornell University, Ithaca, New York 14850. Now at the University of Cambridge, Cambridge, England.

6°. Bubble region at B. * All of the GBD network contrast seen in Fig. 2 (and also in Fig. 3) may not be due to diffraction contrast, since a contribution due to the direct imaging of the network may be present (see previous footnote). DISLOCATION CONTRAST IN THE ELECTRON MICROSCOPE 45 in such a region is therefore a pure Moire pattern due solely to the misorientation of the perfect crystalline regions located above and below the bubble. These bubbles, which were present in all of the boundaries examined, therefore gave us an extremely convenient means of separating out, and observing directly, any Moire effects.

These latter GBD's are clearly observed in the absence of Moire effects in the bright field image, shown in Fig. 3c, which was obtained from the single strong (000) beam seen in Fig. 3a. The diffraction contrast obtained in the case where two (designated now by 1 and 2) enter the objective aperture may obtained by combining our previous solutions for beams 1 and after adding in an appropriate phase factor which takes into account the fact that the beams are slightly divergent. The litude of the total wave field produced by combining the two may be written in the form, beams be 2 ampwaves (1) where ¢i is the amplitude of wave i at z = T as determined from the previous integration of the Howie-Whelan equations, ki is the wave vector, and r is the position vector.

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