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On the theory of photoemission

This paper is concerned with the a priori theory of the photoemission process in solids. Scattering-theoretical and response-theoretical approaches are discussed and a new demonstration of their equivalence is given. The elastic photoemission spectrum is analyzed in detail and an expression exact to all orders in interparticle interaction is obtained. This expression is similar to the renormalized

Ultrasound examination of lymph nodes in the hepato-duodenal ligament with special emphasis on patients with chronic liver diseases

The significance of finding lymph nodes in the hepato-duodenal ligament on ultrasound, with special emphasis on patients with inflammatory liver disease, has been evaluated. In one study a comparison was made with magnetic resonance imaging (MRI), which is another non-invasive imaging modality without the hazards of ionizing radiation. Lymph nodes in the hepato-duodenal ligament were found in beni