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Monochromatic electrostatic waves of large amplitude were excited by the interaction of an electron beam with a bounded plasma. These waves were identified as resonant beam modes, which are amplified by multiple reflexion in a cavity. Nonlinear effects, such as the generation of harmonies and sidebands, were observed.
Sixty agoraphobics were treated by behavioural therapy (self-exposure in vivo) either with their partner involved in all aspects of treatment or without their partner. The two treatment formats were about equally effective. Behavioural treatment directed at the agoraphobia resulted in improvement irrespective of marital quality and partner involvement in the therapy. The effects of treatment led neither to a deterioration of the marriage nor to adjustment problems in the partner. Avoidance behaviour, intropunitivity and overprotection were found to predict treatment response. The partners of agoraphobics were not found to have psychological problems themselves.
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