Theory of the halftone process. II. The diffraction theory-calculation of the light distribution

An approximate method of calculating the light distribution in the dots formed behind a halftone screen from the Fresnel diffraction theory is described, and in a typical case, the distribution is found to check closely with that determined experimentally, being very different from that calculated from geometrical optics.     

Stress management for school personnel: Stress-inoculation training and exercise

This study evaluated the effectiveness of Stress-Inoculation Training (SIT) with and without an exercise component and a Minimal exercise treatment (MIN) on trait anxiety, teacher stress, and coping strategies among 66 school personnel. The findings indicate that the 8-week SIT with an exercise component was more effective than MIN in reducing anxiety and teacher stress. Both groups significantly decreased emotionfocused coping and increased preventive coping; however, problem-focused coping did not change. SIT without an exercise component did not significantly affect anxiety, stress, or coping strategies; however, there is some evidence that this was due to the cyclical nature of stress in the schools. Changes in teacher stress and coping strategies occurred mainly for those who were below the median of the sample on physical fitness and anxiety prior to beginning the program. Implications of these findings for school-based stress management programs are discussed.