RESUMEN
Distributed acoustic sensing (DAS) technology based on Rayleigh backscattering is experiencing a rapid development and leading itself into wider applications because of the unique capability of measuring sound and vibrations at all points along the sensing fiber. However, most implementations of DAS provide the position of detected sources as a function of distance within the one-dimensional axial space along the sensing fiber. A DAS system with the capability of two-dimensional (2D) and three-dimensional (3D) acoustic source localization in air is demonstrated that uses array signal processing to deal with the spatial correlation of the information measured by optical fiber. Preliminary work has demonstrated 2D acoustic source localization for multi-targets with a narrowband signal source of the same frequency and 3D position for a moving narrowband acoustic source. The results establish a new method which opens up new areas of applications of DAS such as location and identification for static, dynamic, and multiple targets in air or water.
RESUMEN
objective to find a proper pathway for the regional chemotherapy of pancreatic carcinoma. Method A total of 39 cases of unresectable pancreatic carcinoma was collected and divided into five groups. Ⅰ: celiac artery group, 5 cases; Ⅱ: gastroduo-denal artery group,24 cases;15 cases were directly inserted into this artery (ⅡB)and 9 cases indirectly through gastroepiploric artery (ⅡA). Ⅲ: gastroepiploric right artery group, Scases; Ⅳ: splenic artery group, 5 cases. Result. For these groups, the first group can be detected that the pancreatic head is clearly dyed; in the second group the pancreatic head was apparently dyed. The body and tail of pancreas were clearly dyed in the splenic artery group and failed in the second group. Conclusion For pancreatic head carcinoma, the gastroduodenal artery is the first choice; splenic artery is proper for the carcinoma in the body and tail of pancreas.
RESUMEN
Objective : The patients with inguinal hernia were treated with plug mesh hernia repair. Methods:The hernia sacs were isolated and dissected back to the internal ring. The unoperated sacs were allowed to drop back through the internal ring into the abdominal cavity. A cone-shaped mesh hernia plug is inserted tapered end through ring and placed into position just beneath the crura. All our repairs were reinforced a second piece of flat was placed from the pubic tubercle, overlying the direct space. Results : Com-paired with conventional suture surgical techniques, a plug repair uses less disscection and ensures tenssion free hernioplusty. Conclusion : We believe that the two factors are the most important reseasons for greater patients confort, rapit rehabilitation, decreased recurrence and lessened overall complication rates with the mesh hernia plug techniques.