The unreasonable setting of thermal insulation layer in high cold tunnels not only increases the maintenance cost tunnels, but also weakens anti-freezing and resistance tunnels. In order to optimize an Alpine tunnel, relying on Dabanshan tunnel Qinghai Province, three schemes radial longitudinal region were adopted, temperature field surrounding rock was numerically analyzed. results show that ...

abstract background: in vivo measurements of applied dose during radiotherapy treatment, is important to ensure accurate dose delivery to patients. uncertainty in dose delivery should fall within ±5% of the prescribed dose as recommended by icru. assessment of dose for radiotherapy applications performed with various types of detectors. in this study, semiconductor diodes were used which have s...

introduction: controversy remains as to the advantages and disadvantages of pharyngeal packing during septorhinoplasty. our study investigated the effect of pharyngeal packing on postoperative nausea and vomiting and sore throat following this type of surgery or septorhinoplasty.   materials and methods: this clinical trial was performed on 90 american society of anesthesiologists (asa) i or ii...

introduction: today, temporary or permanent venous catheters are being increasingly used in patients with renal failure. it seems a necessity to be familiar with their clinical applications and complications as well as their efficacy. the aim of this study was to compare the efficacy of two catheters of 16 cm and 20 cm lengths. methods: this research project was a descriptive, analytic study co...