Atomic fountain clocks are emerging as an important new technology for the realization of extremely precise passive atomic standards. The U.S. Naval Observatory (USNO) has undertaken a project to develop atomic fountains for eventual incorporation into the USNO Master Clock. We have recently demonstrated short-term stability of ZxIO-” at I second with white frequency behavior into the mid I0,’5...

We report here the discovery of a fancy interaction between cesium iodide (CsI) and methylamine (CH3NH2) due to the presence of the hydrogen bond. The formed CsI$xCH3NH2 is a liquid phase, which facilitates the large scale fabrication of highly uniform cesium-containing perovskite films with strong (110) preferred orientation by the CH3NH2 gas healing process. With this method, at most 10% nonp...

Quantitative ultratrace analysis (10 nmol to 10 mumol/l) of cesium in biological samples such as human body fluids and animal tissues is performed without any prior purification or concentration steps. The normal level of cesium ions in heart cells was determined. After poisoning these cells with high concentrations of the alkali cation much higher levels were found inside the cells then had be...

Accelerating MR scan is of great significance for clinical, research and advanced applications, and one main effort to achieve this is the utilization of compressed sensing (CS) theory. Nevertheless, the existing CSMRI approaches still have limitations such as fine structure loss or high computational complexity. This paper proposes a novel iterative feature refinement (IFR) module for accurate...

After the Fukushima Daiichi nuclear incident in 2011, radiation contamination of the affected area raised public health concerns about internal radiation exposure. Internal radiation exposure screening using a whole body counter (WBC) (Fastscan Model 2251, Canberra Inc, Meriden, CT) has been performed for the affected residents in Soma City, 40 km north of the Fukushima Daiichi nuclear power pl...

An experimental investigation of the Cs 6s S1/2→6p P3/2→10s S1/2 double-resonance two-photon polarization spectrum has been made. In the investigation, a linear polarization degree was measured to extract the alignment depolarization cross section in the cesium 6p P3/2 level due to collisions between ground-level argon and excited 6p P3/2 cesium atoms over the Zeeman coherences. The spectra sho...