نتایج جستجو برای: helical port
تعداد نتایج: 51234 فیلتر نتایج به سال:
Inside living cells, many essential processes involve deformations of charged helical molecules and the interactions between them. Actin filaments and DNA molecules are important examples of charged helical molecules. In this paper, we consider an impermeable double stranded charged molecule in the solvent. According to the nature, the dielectric constant of the molecule is considerably differe...
background: in helical tomotherapy (ht), the scaling factor (sf) is the time in seconds that each leaf viewing a target would need to be open to deliver the prescribed dose. the sf is patient-specific and is used to calculate the rotational period of the gantry, and the total treatment time (ttt) of the ht. the sf is generally difficult to estimate. currently, it takes about one hour to fully o...
This paper describes the application of the beam emission spectroscopy (BES) to Heliotron J, having the nonsymmetrical helical-magnetic-axis configuration. The spectral and spatial profile of the beam emission has been estimated by the numerical calculation taking the collisional excitation processes between plasmas (electrons/ions) and beam atoms. Two sets of the sightlines with good spatial r...
background port site complications following elective surgery are rare and port site infections remain the most common short long term complications. objectives the study was conducted to analyze port site complications occurring in patients undergoing laparoscopic cholecystectomy for symptomatic cholelithiasis. patients and methods ninety patients undergoing laparoscopic cholecystectomy were r...
In this paper a mathematical model for the working process of a refriceration helical screw compressor is presented and discussed. The manner in which geometric parameters such as cell volume, sealing line length, blow hole are..,, discharge port area etc. a.re related to rotation angle is established a.nd used in the thermodynamic model which is based on real cas laws. The influence of factors...
In the Large Helical Device (LHD), the installation of a pair of ion cyclotron range of frequencies (ICRF) antennas from upper and lower ports is planned. These antennas are geometrically symmetrical and located side by side. By changing the current phase on the straps, the wave number parallel to the magnetic field line can be controlled. However, antenna impedances will also be changed and re...
This paper describes the measurement of the density fluctuation using beam emission spectroscopy in Heliotron J, having the non-symmetrical helical-magnetic-axis configuration. In order to optimize the sightlines, the numerical calculations are carried out to estimate the spatial resolution and the observation location. When a tangential neutral beam is used as diagnostic one, suitable sightlin...
Neutrons are generated in a fusion plasma and induce various radionuclides via nuclear reaction with reactor materials. Evaluating the kinds of nuclide amount induced radioactivity is important for decommissioning planning regular maintenance. In this study, we verified long-term prediction model large helical device (LHD) by comparing during deuterium experiments LHD results calculated using h...
This paper focuses on the S-parameter method that is a basic method for measuring the input impedance of balanced-fed antennas. The basic concept of the method is summarized using the two-port network, and it is shown that the method can be enhanced to the unbalanced antennas using a formulation based on incident and reflected waves. The compensation method that eliminates the influence of a me...
Application of nanofluid and coiled tubes are two passive methods for increasing the heat transfer. In the present study, the turbulent flows of water and nanofluid in coiled tubes heat exchanger were numerically studied. CuO-water nanofluid containing 1 vol% copper oxide nanoparticles was used and single-phase approach was considered for nanofluid flow. The effect of different geometrical para...
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