In: Journal of the Society for Gynecologic Investigation: official publication of the Society for Gynecologic Investigation, Band 7, Heft 3, S. 153-160
The dynamical behavior of domestic political hostility is modeled in terms of the interaction between hostile (challenger) and ruling (regime) groups. The conditions under which the conflict situation will either settle down in a steady state or evolve in time are derived for various forms of collective action costs. The model presented is a general framework for explaining the various outcomes of the repression/dissent nexus as special cases of the same fundamental process. We also obtain critical parameter values of discontent that bring about discontinuous jumps in the level of hostility.
Passive night vision devices are used for viewing the military targets at low light levels of illuminations during night. In these passive night vision devices, image intensifier tubes areused to amplify scene imagery. The performance of these tubes depends upon electrooptical parameters. The techniques of evaluating these parameters, eg, luminous gain, automatic rightness control and maximum screen luminance, photocathode sensitivity, radiant gain, equivalent background illumination, magnification and distortion, signal-to-noise ratio, veilingglare, screen brightness variation, etc. have been described.