			Home About us Contact

Original Technique (original + technique)

Distribution by Scientific Domains

Medical Sciences	50%
Engineering	33%

Selected Abstracts

Whole stomach with antro-pyloric nerve preservation as an esophageal substitute: an original technique

DISEASES OF THE ESOPHAGUS, Issue 2 2004
J.-M. Collard
SUMMARY., The paper describes an original technique of gastric tailoring in which the two-thirds of the lesser curvature proximal to the crow's foot are denuded flush with the gastric wall, leaving both nerves of Latarjet and the hepatic branches of the left vagus nerve intact. Maintenance of the vagal supply to the antro-pyloric segment in two patients resulted in the presence of peristaltic contractions sweeping over the antrum on simple observation of the antral wall at the end of the procedure and on both upper G-I series and intragastric manometry tracings 6 weeks postoperatively. Gastric exposure to bile on 24-h gastric bile monitoring was normal 6 weeks after the operation. Neither patient had any gastrointestinal symptoms with the exception of early sensations of postprandial fullness when overeating. [source]

Role of the temperature distribution on the PN junction behaviour in the electro-thermal simulation

INTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS, DEVICES AND FIELDS, Issue 6 2004
Hatem Garrab
Abstract Electro-thermal simulations of a PIN-diode based on the finite-element method, show a non-uniform temperature distribution inside the device during switching transients. Hence, the implicit assumption of a uniform temperature distribution when coupling an analytical electrical model and a thermal model yields inaccurate electro-thermal behaviour of the PIN-diode so far. The idea of including non-uniform temperature distribution into power semiconductor device models is not new, as accurate electro-thermal simulations are required for designing compact power electronic systems (as IC or MCM). Instead of using a one-dimensional finite difference or element method, the bond graphs and the hydrodynamic method are utilized to build an electro-thermal model of the PIN-diode. The results obtained by this original technique are compared with those obtained by a commercial finite-element simulator. The results are similar but the computation effort of the proposed technique is a fraction of that required by finite-element simulators. Moreover, the proposed technique may be applied easily to other power semiconductor devices. Copyright © 2004 John Wiley & Sons, Ltd. [source]

Aqueous Corrosion of the GeSe4 Chalcogenide Glass: Surface Properties and Corrosion Mechanism

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 8 2009
Yi-Fan Niu
The aqueous corrosion behavior of the GeSe4 glass composition has been studied over time under various conditions (temperature and pH). The evolution of the surface topography by atomic force microscopy and properties such as surface hardness and reduced modulus, as well as the optical transmission in the 1,16 ,m window, have been measured as a function of time spent in the corrosive solution. It was found that even if the glass reacts at room temperature, its optical transparency was barely affected. Nevertheless, the durability of GeSe4 was found to be drastically affected by an increase of both temperature and pH. Furthermore, pure selenium nanoparticles were formed during the corrosion process, and the nature of these nanoparticles,amorphous or crystallized (hexagonal phase),depends on temperature. A reaction mechanism was proposed, and the activation energy of the reaction of corrosion in deionized water (47 kJ/mol) was determined from an original technique that relies on the temporal optical loss variation of a GeSe4 optical fiber placed in water at different temperatures. [source]

An interpolated spatial images method for the analysis of multilayered shielded microwave circuits

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2008
J. S. Gómez-Díaz
Abstract In this article, an efficient interpolation method is presented to compute the Green's function associated with electrical sources, when they are placed inside cylindrical cavities. The interpolation scheme is formulated in the frame of the spatial images technique recently developed. The original idea was to calculate, for every location of a point electric source, the complex values of the electric dipole and charge images, placed outside the cavity, to impose the appropriate boundary conditions for the potentials. To considerably reduce the computational cost of the original technique, a simple interpolation method is proposed to obtain the complex values of the images for any source location. To do that, a rectangular spatial subdivision inside the cavity is proposed. Each new subregion is controlled by means of the exact image values obtained when the source is placed at the four corners of the region. The key idea is to use a bilinear interpolation to obtain the image complex values when the source is located anywhere inside this subregion. The interpolated images provide the Green's functions of the new source positions fast, and with high accuracy. This new approach can be directly applied to analyze printed planar filters. Two examples with CPU time comparisons are provided, showing the high accuracy and computational gain achieved with the technique just derived. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2294,2300, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23683 [source]

Prospective study of open preperitoneal mesh repair for recurrent inguinal hernia,

BRITISH JOURNAL OF SURGERY (NOW INCLUDES EUROPEAN JOURNAL OF SURGERY), Issue 1 2002
M. Kurzer
Background: Recurrent inguinal hernia presents a significant clinical problem with high re-recurrence and complication rates, particularly when an anterior approach is used. This study evaluated the open preperitoneal approach for repair of recurrent inguinal hernia. Methods: This was a prospective cohort study of 101 consecutive patients with 114 recurrent inguinal hernias. All were operated on using an open preperitoneal technique and prosthetic mesh by the method of Stoppa or Wantz. Follow-up was at 2,6 weeks, 15 and between 42 and 54 months. Results: There were no major complications. There was one infection and one case of retention of urine. There were no testicular complications. There were five recurrences, all within 6 months of operation, four of which were among the first 20 cases. Modifications to the original technique were made, and one recurrence occurred in the remaining 81 patients (1 per cent) or 106 hernias (1 per cent). Conclusion: Preperitoneal mesh repair gives results far superior to those of the commonly used anterior approach. It is safer and easier to learn than laparoscopic repair and is the procedure of choice for complex multirecurrent inguinal hernia. © 2002 British Journal of Surgery Society Ltd [source]