Process Chain Development for the Fabrication of Three-Dimensional Braided Oxide Ceramic Matrix Composites.

Fiber composites with a three-dimensional braided reinforcement architecture have higher fiber volume content and Z-fiber content compared to a two-dimensional braided reinforcement architecture; as a result, the shear strength increases. Porous oxide fiber composites (OFCs) have the inherent weakness of a low interlaminar shear strength, which can be specifically increased by the use of a three-dimensional fiber reinforcement. In this work, the braiding process chain for processing highly brittle oxide ceramic fibers is modified; as a consequence, a bobbin, which protects the filament, is developed and quantitatively evaluated on a test rig with regard to tension and filament breakage.

[The 25-year existence of the Society of Gastroenterology of East Germany.I. 200 years of gastric intubation--its significance in the development of gastroenterology].

In an overview of the history of gastric intubation, the first use of a stomach tube in 1790 is reported, and the importance of the works of Kussmaul and his assistants as well as of Leube, Ewald, Boas, and Einhorn are specially stressed. With the development of new possibilities of investigation by means of the gastric tube gastroenterology began to emerge as a special field.

Combined neuroradiological and neurosurgical treatment of intracerebral arteriovenous malformations.

Four patients with intracerebral vascular malformations underwent preoperative butylcyanoacrylate embolization via a calibrated leak catheter, in order to reduce the risks of surgery alone. In three cases the malformation was removed without causing neurological deficits. One patient died later from recurrent bleeding.