In Situ Synthesis of Al-Based MMCs Reinforced with AlN by Mechanical Alloying under NH3 Gas.

Aluminum matrix composites (AMCs) reinforced by aluminum nitride were prepared by mechanical alloying followed by a simple press and sintering method. Milling began under vacuum and after a period of between 1 and 4 h, NH3 gas flow (1 cm³/s) was incorporated until the total milling time of 5 h was reached. Results show that in addition to the strain hardening taking place during mechanical alloying, NH3 plays an additional role in powder hardening. Thereby, the properties of the sintered compacts are strongly influenced by the amount of N incorporated into the powders during milling and the subsequent formation of AlN during the consolidation process. The obtained AMC reaches tensile strengths as high as 459 MPa and hardness much higher than that of the as-received aluminum compact.

Hernia perineal tras amputación abdominoperineal laparoscópica en cirugía de cáncer del recto / Perineal hernia after laparoscopic abdominoperineal resection in rectal cáncer surgery

Las hernias perineales son una enfermedad rara. Su incidencia se estima en un 1% después de la amputación abdominoperineal y en 3-10% de las resecciones pélvicas para los tumores malignos. Se puede definir como la protrusión del contenido intestinal a través del suelo pélvico. Las hernias perineales se clasifican como congénitas, primarias debido a defectos del piso pélvico o secundarias a la cirugía en la cavidad pélvica. Las hernias perineales secundarias tras amputación abdominoperineal para el cáncer rectal se describen por primera vez en 1939 por Yeomans. En 2007 Veenhof4 publicó un caso de hernia perineal secundaria a amputación abdominoperineal por laparoscopia. Presentamos el caso de un paciente en el postoperatorio temprano de una amputación laparoscópica abdominoperineal con una obstrucción secundaria a una hernia perineal

Perineal hernias are a rare disease. Its incidence is estimated at 1% after abdominoperineal amputation and in 3-10% of pelvic resections for malignant tumors. It can be defined as the protrusion of the intestinal contents through the pelvic floor. Perineal hernias are classified as congenital, primary due to pelvic floor defects or secondary to surgery in the pelvic cavity. Secondary perineal hernias after abdominoperineal amputation for rectal cancer is first described in 1939 by Yeomans. In 2007 Veenhof4 published a case of perineal hernia secondary to abdominoperineal amputation by laparoscopy. We present a case of a patient in the early postoperative period, of a laparoscopic abdominoperineal amputation, with an obstructive condition secondary to a perineal hernia