objective: the objective of this research is to examine pcb compounds in the persian gulf in the southern pars area. methods: in the research, 6 stations were sampled: asalouyeh port, kangan site, mehr petro kima petrochemical, 4th refinery in southern pasr, taheri port and aria sasol polymer. to sample water in the stations determined, one-liter sampling bottles of dark glass were used. in eac...

The current paper presents a six-port low-loss waveguide coupler based on ridge gap structure with potential application in various mmWave wireless systems. challenges the fabrication faced frequencies can be overcome by using technology. excitation of presented junction is done standard WR-28 flanges at bottom. performance proposed confirmed and measurement. measured results show that operates...

Planar photonic integrated circuits based on four-port couplers offer enhanced sophistication and functionality. Each four-port coupler is characterized by sixteen signal coupling coefficients governed by ten energy constraints. The ability to generate the constrained sixteen coupling coefficients is needed in the analysis of the four-port coupler. However, the energy constraint equations are n...

Properly selected port sites for robot-assisted coronary artery bypass graft (CABG) improve the efficiency and quality of these procedures. In clinical practice, surgeons select port locations using external anatomic landmarks to estimate a patient's internal anatomy. This paper proposes an automated approach to port selection based on a preoperative image of the patient, thus avoiding the need...

Abshc-In a preview publication by the authors it was shown how swhbed-capacitor (SC) networks can bc analyzed by using nodal charge qUatfons. The result was a description of SC networks as time-variant sampled-data networks which led to a four-port e4@valent circuit rep* sent&ion in tbe z-domain. In this paper, the four-port representation is expanded by considering six basic building blocks fo...

OBJECTIVE To test the feasibility of needlescopic cholecystectomy using a two-port technique with 3-mm miniaturised instruments. DESIGN Prospective study. SETTING Regional hospital, Hong Kong. PATIENTS One hundred consecutive patients undergoing elective cholecystectomy from September 2001 to August 2002. INTERVENTION Two-port needlescopic cholecystectomy all performed or supervised by ...

BACKGROUND Thoracoscopic surgery has become very popular in recent years. Conventional thoracoscopic surgery requires three or more port wounds for manipulations of endoscopic instruments. For complicated cancer surgery, more port wounds and a larger thoracotomy wound may be required due to technical reasons. We want to investigate the effectiveness of single-port thoracoscopic approach in elec...

PURPOSE To evaluate the outcome of postoperative radiotherapy (PORT) and salvage RT (SART) using a three-dimensional conformal two-dynamic arc (3D-ART) or 3D six-field technique in 431 prostate cancer patients. METHODS AND MATERIALS Of the 431 patients, 258 underwent PORT (started <6 months after radical prostatectomy) and 173 underwent SART because of biochemical failure after radical prosta...