RESUMO
We report on the observation of the Ising quantum Hall ferromagnet with Curie temperature T(C) as high as 2 K in a modulation-doped (Cd,Mn)Te heterostructure. In this system field-induced crossing of Landau levels occurs due to the giant spin-splitting effect. Magnetoresistance data, collected over a wide range of temperatures, magnetic fields, tilt angles, and electron densities, are discussed taking into account both Coulomb electron-electron interactions and s-d coupling to Mn spin fluctuations. The critical behavior of the resistance "spikes" at T-->T(C) corroborates theoretical suggestions that the ferromagnet is destroyed by domain excitations.
RESUMO
Electroexcision of hemorrhoidal nodes was performed in 71 patients with hemorrhoids in the acute phase complicated with anorectal thrombosis, ulceration and hemorrhage. The stages of surgery are described. Data of coagulograms, expediency of the local durant analgesia in the postoperation period are presented. The method is radical, bloodless. It allows shortening the time of stationary treatment and the duration of disability. All the operated patients showed good near and late results.
Assuntos
Eletrocirurgia/métodos , Hemorroidas/cirurgia , Doença Aguda , Adulto , Idoso , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Cuidados Pós-Operatórios , Cuidados Pré-OperatóriosRESUMO
The clinical picture of solid tumors of the intestinal mesentery is varied and depends on the character of growth (benign, malignant), size and anatomical variants of tumor localization in the mesentery. Sometimes, the tumors concerned can induce pseudosyndrome of acute abdomen or inflammation of the adjacent organ secondary involved by tumor. Among complications induced by tumor are as follows: intestinal hemorrhage, peritonitis and acute or partial intestinal obstruction. The roentgenological picture of intestinal mesentery tumors shows some characteristic features. Eight observations of the author are reported.