In this research, heat transfer enhancement and simultaneous effect of that on pressure drop inside condensers with twisted tape inserts are investigated. A refrigeration system is designed for attaining to maximum level of heat transfer with minimum pressure drop. The test condenser is a double pipe heat transformer with inner and outer diameter of 10.7mm and 12.7mm for internal pipe, respecti...

We have developed radiofrequency coils for high-field head and whole-body imaging which achieve near optimal rf field (Br) homogeneity and signal-to-noise ratio (SNR). The design, based on a lumped element delay line, has a number of advantages. The rf field uniformity is significantly better than that of a saddle coil or slotted tube resonator. The improved Br homogeneity is needed to generate...

We report on studies of the n-type doping dependence of the Raman response of double-wall carbon nanotubes (DWCNT). The G-line is found to be shifting upon doping. The direction of the shift depends on if the exciting laser light is in resonance with mainly inner or outer tubes. The RBM response upon doping shows that a charge transfer from the dopant happens predominantly to the outer tubes at...

To the Editor:-I read with interest the report by Iseki et aZ.,' who attached a string to the tip of a lighted wand (Trachlight; Laerdal Medical, Armonk, NY) and inserted this modified wand into an endotracheal tube to maneuver the tip of the tube during blind nasotracheal intubation. I suggest that an alternative method is to use the Trachlight and Endotrol tube (Mallinckrodt, Athlone, Ireland...

This paper summarizes a principle for measurement of inner diameter or profile of pipes and tubes using optical method. Based on this principle, compact probes have been developed for industrial applications such as car industry, heavy industry and civil engineering. In addition to large probes for pipes, tubes and tank-like objects with diameter larger than 1meter, such small size probes as 5m...

To minimize the flow-dependent effects caused by an endotracheal tube during impedance measurements, we recorded pressure inside the tube at its distal end. We used a commercial endotracheal tube with a lumen built into its wall with the opening located near the outlet of the tube. We characterized the effect of the tube by means of an effective transfer function (H). We measured H from 0.25-32...