The behaviour of the capacitances of LDMOS devices as a function of gate and drain bias is analysed using TCAD simulations and S-parameter measurements. Both simulations and measurements revealed that instead of the smooth sigmoïd shape usually seen in MOSTs, the capacitances of LDMOS devices show a distinct ridge at low values of Vds. A full analysis of this phenomena is used to propose a sign...

The hierarchy of models applicable to transient free surface problems of ground water ̄ow to drains is discussed. The model choice is related to drain type and dewatering stage. Flow pattern is illustrated to vary with decrease of the water table. Simulation of drains and corresponding boundary conditions are discussed. # 2000 Elsevier Science B.V. All rights reserved.

introduction: better use of water and soil resources in paddy fields, increase in rice production and farmer's income, installation of subsurface drainage system is necessary. the main goalof these systems, are aeration conditions improvement prevention of water logging, yield increase, land use increase and multiuse of the land. in different countries, installation of subsurface drainage cause...

Background: Thyroidectomy is one of the most difficult surgical procedures. The study aims to compare thyroidectomy procedure with drain placement and without concerning hospital stay, Postoperative complications, pain assessment using a visual analog scale. Methods: A prospective comparative was designed in Department otorhinolaryngology & Head Neck Surgery---removed for blind review----. ...

Aim: To compare the outcome of laparoscopic cholecystectomy with and without drain. Study design: Randomized controlled trial Place and duration of study: Surgical department of CMH lahore medical and dental college Unit I, II, III and IV, Jinnah hospital, Lahore.6 months 15-11-2009 to 14-05-2010. Patient and methods: Five hundred and seventy cases of gallstone disease were registered who fulfi...

Objective] Recently, the effectiveness of closed wound drainage has been evaluated for various types of orthopedic surgery. Some studies showed insufficient evidence to support the routine use of a drain. In the current analysis, the efficacy of closed suction drainage in anterior spinal fusion for lumbar spinal tuberculosis was retrospectively evaluated. [Patients and Methods] Ninety-one conse...

laparoscopy has made a revolution in surgical procedures and treatment of various diseases but its complications are still under investigation. intra-abdominal visceral and vessel injuries, trocar site hernia, and leaving foreign bodies into the peritoneal cavity are among some laparoscopic surgery complications. this is a rare report of penrose drain migration following incomplete laparoscopic...

r a 200 .046 .: +44 19 all@durh Summary Water discolouration is a major management problem for UK water companies as a proportion of the supply relies on runoff from peat-covered catchments. Many peats have been drained using surface ditches but this has been shown to lead to more severe water discolouration. Drain-blocking is now actively encouraged in UK peatlands to promote peatland habitats...