Special Issue Introduction: Thinking Through “Being in the COVID‐19 World” and Bright Spots for our Food Futures

In this special issue, we encouraged project scholars to be bold and construct their voices. We now reflect on the results, which include the bright spots in four areas: project organizing (organizing and collaborating in and between projects), project value (organizing value in and through projects), project citizenship (living in and through projects), and project scholarship (reflecting on project theorizing and scholarship). We then dared to voice our views on three dark spots: a lack of diversity in the project scholars’ ethnicities, geographies, and genders; in disciplines that extend beyond management and organization studies; and in modes of reflexivity.

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Analysis of Dark-Field Images of Disordered Materials

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100096059 ◽

1972 ◽

Vol 30 ◽

pp. 560-561

Author(s):

J. M. Cowley

Keyword(s):

Amorphous Materials ◽

Careful Analysis ◽

Dark Field ◽

Minimum Diameter ◽

Statistical Fluctuations ◽

Bright Spots ◽

Sufficient Detail ◽

Random Arrangement ◽

Diffraction Patterns ◽

Imaging Conditions

Recently a number of authors have reported detail in dark-field images obtained from diffuse-scattering regions of electron diffraction patterns. Bright spots in images from short-range order diffuse peaks of disordered binary alloys have been interpreted as evidence for the existence of microdomains of ordered lattice or of segragated clusters of one component. Spotty contrast in dark field images of near-amorphous materials has been interpreted as evidence for the existense of microcrystals. Without a careful analysis of the imaging conditions such conclusions may be invalid. Usually the conditions of the experiment have not been specified in sufficient detail to allow evaluation of the conclusions.Elementary considerations show that even for a completely random arrangement of atoms the statistical fluctuations of density will give a spotty contrast with spots of minimum diameter determined by the dark field aperture size and other factors influencing the minimum resolvable distance under darkfield imaging conditions, including fluctuations and drift over long exposure times (resolution usually 10Å or more).

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