A cesium-free negative hydrogen ion source driven with a LaB6 filament is being operated for J-PARC. The beam commissioning of J-PARC accelerators started in November 2006. As of June 2010, there have been 34 beam commissioning or supply runs. In these runs, the ion source has been successfully operated in two different modes such as low current mode of 5 mA and high current mode of 30 mA. Acco...

In this review, we discuss the use of time-of-flight secondary-ion mass spectrometry (TOF-SIMS) technology for analyzing viscous glue (is called aggregate droplets) spider orb webs and examine results obtained. Element distribution images droplets were observed by TOF-SIMS. A uniform element is seen suspended pristine droplets, a differential spreading components attached droplets. We also TOF-...

In this review, we discuss the use of time–of–flight secondary–ion mass spectrometry (TOF–SIMS) technology for analyzing viscous glue (is called aggregate droplets) spider orb webs and examine results obtained. Element distribution images droplets were observed by TOF–SIMS. A uniform element is seen suspended pristine droplets, a differential spreading components attached droplets. We also TOF–...

In recognition of the 0ct)ober 1964 declaration of the International Committee of Weights and Measures that the physical measurement of time be based on a particular transition between two hyperfine levels in the ground state of cesium 133, a review of the characteristics of cesium beam atomic frequency standards is presented. This article discusses the general requirements for frequency and ti...

Analysis of experimental microwave Xamsey patterns, obtained with a laser pumped cesium beam frequency standard, shows the cesium atoms velocities to follow a broad 14axwellian distribution. As a consequence, the estimate of the second-order D6ppler-shift and cavity 2hase-shift could be more accurately obtained with this device than with the classical cesium beam frequency standard .

We describe the fabrication of chip-sized alkali atom vapor cells using silicon micromachining and anodic bonding technology. Such cells may find use in highly miniaturized atomic frequency references or magnetometers. The cells consist of cavities etched in silicon, with internal volumes as small as 1 mm. Two techniques for introducing cesium and a buffer gas into the cells are described: one ...

The specific membrane resistivity of motoneurons at or near the soma (Rms) is much lower than the specific membrane resistivity of the dendritic tree (Rmd). The goal of the present experiments was to investigate the contribution of tonically active voltage-dependent potassium channels at or near the soma to the low Rms. These channels were blocked with the use of intracellular injections of ces...