Safety analysis in gas process facilities is necessary to prevent unwanted events that may cause catastrophic accidents. Accident scenario analysis with probability updating is the key to dynamic safety analysis. Although conventional failure assessment techniques such as fault tree (FT) have been used effectively for this purpose, they suffer severe limitations of static structure and uncertai...

STUDY DESIGN Cadaveric single vertebrae were used to evaluate vertebroplasty as a prophylactic treatment and as an intervention for vertebral compression fractures. OBJECTIVE To investigate the biomechanical characteristics of prophylactic reinforcement and postfracture augmentation of cadaveric vertebrae. SUMMARY OF BACKGROUND DATA Percutaneous vertebroplasty is a treatment option for oste...

One of the main challenges faced in design and construction phases of tunneling projects is the determination of maximum allowable advance step to maximize excavation rate and reduce project delivery time. Considering the complexity of determining this factor and unexpected risks associated with inappropriate determination of that, it is necessary to employ a method which is capable of accounti...

CRC cards are unconventional method for identifying and describing classes, behavior and its responsibilities and collaborators of class. Representation of three categories of class, responsibilities and collaborators can give proper image of scenario. These cards are effective method for analyzing scenarios. With all positive features of CRC cards, of weaknesses of these cards are failure to s...

Although the volume of research on carbon nanotubes (CNTs) has increased over a short period, less attention been paid to other types carbon-based nano-objects such as boron carbide (BC3) (BC3NTs). In present article, we modeled BC3NTs using molecular dynamics (MD) simulation investigate effects chirality, wall number, diameter and temperature mechanical failure BC3NTs, BC3 nanobuds with differ...

MAJOR abdominal and thoracic surgeries are frequently associated with postoperative acute respiratory failure (ARF) as a result of atelectasis or pneumonia. In the follow-up to this type of surgery, increasing numbers of reports suggest that noninvasive ventilation (NIV) may help prevent ARF. The Case Scenario presented here illustrates the potential benefit of applying NIV. In addition, it hig...