Broadband metrological-grade frequency comb (FC) synthesizers with a rich number of phase locked modes are the ideal sources for quantum sensing and metrology. At terahertz (THz) frequencies, electrically pumped cascade lasers (QCLs) have shown quantum-limited noise operation, phase/frequency absolute referencing self-starting FC albeit over rather restricted dynamic range, governed by nature g...

The high penetration of inverter-fed renewable energy sources (RESs) in modern systems has led to a reduction the system’s inertial response. This rotational response is associated with synchronous generation and might result deteriorated frequency following power disturbance. paper investigates stability Kingdom Saudi Arabia’s (KSA) grid. It includes description changing landscape KSA’s electr...

objective: to estimate the size of groups at high risk of hiv, network scale up (nsu), an indirect method, was used. methods: 500 kermanian male aged 18 to 45 were recruited. 8 groups at high risk of hiv were defined: users of opium, unknown drug, ecstasy, and alcohol; intra‑venous drug users (idus; males who have extra‑marital sex with females (msf); male who have sex with female sex workers (...

Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including ...

BACKGROUND Studies of ventricular fibrillation (VF) in small mammals have revealed localized sustained stationary reentry. However, studies in large mammals with surface mapping techniques have demonstrated only relatively short-lived rotors. The purpose of this study was to identify whether sustained high-frequency activation with low beat-to-beat variability was present at intramural sites in...