BACKGROUND AND OBJECTIVES Few investigations have addressed the safety of oxygen from concentrators for use in anesthesia in association with nitrous oxide. This study evaluated the percent of oxygen from a concentrator in association with nitrous oxide in a semi-closed rebreathing circuit. METHODS Adult patients undergoing low risk surgery were randomly allocated into two groups, receiving a...

We present a low-loss, compact, polarization insensitive 3-dB optical power-splitter for submicron silicon waveguides. The splitter is optimized over broad wavelength span ranging from 1300 to 1700 nm through finite difference time domain simulations. junction footprint only 1.8 × 1.3 ?m, which smaller than previously reported broadband multimode splitters. Furthermore, the demonstrated device ...

Improved performance has been reported for master runners (i.e. athletes older than 40 years) in both single marathons and single ultra-marathons. This study investigated performance trends of age group ultra-marathoners competing in all 100 km and 100 miles races held worldwide between 1971 and 2013. Changes in running speeds across years were investigated for the annual ten fastest 5-year age...

Two modes are being considered for a 50 on 50-GeV muon collider: one being a high-luminosity ring with broad momentum acceptance (dp/p of ∼ 0.12%, rms) and the other lower luminosity with narrow momentum acceptance (dp/p of ∼ 0.003%, rms), or Higgs Factory. To reach the design luminosities, the value of beta at collision in the two rings must be 4 cm and 14 cm, respectively. In addition, the bu...

Back pain is a common complaint among people. This study aimed to evaluate lower back (LBP) in athletes and non-athletes, identify the associated risk factors, suggest management strategies. A cross-sectional was conducted Saudi Arabia from September 3 October 15, 2020. The sample size 1,446 individuals, random sampling performed. It included individuals between 18 50 years. Participants with c...