G S Vasilév

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This work presents an analytic description of coherent excitation of a two-state quantum system by an external field with a Gaussian temporal shape and a linear frequency sweep. A very accurate analytic approximation to the transition probability in terms of the Lambert function is derived by using the Dykhne-Davis-Pechukas approach. This approximation(More)
In the Clinic of Pediatric Surgery of the Russian State Medical University 310 operations for esophagoplasty were performed using segments of the small and large intestine. The 50-year progress in the creation of an artificial esophagus is characterized by gradual advancement from prethoracic plasty after Roux-Herzen-Yudin to the refined method of(More)
The authors find it necessary to identify a nosological entity of short esophageal strictures, up to 1.5-2.0 cm long, from the specific features of their formation, clinical manifestations and from the possibility of widely using transesophageal methods of treatment. Among them, a procedure for intraesophageal compression of the scarring ring by using two(More)
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