An ensemble of rubidium atomic fountain clocks has been put into operation at the US Naval Observatory (USNO). These fountains are used as continuous clocks in the manner of commercial caesium beams and hydrogen masers for the purpose of improved timing applications. Four fountains have been in operation for more than two years and are included in the ensemble used to generate the USNO master c...

Atomization and fountain formation is a well-known phenomenon that occurs when a focused ultrasound wave in liquid encounters an air interface. High intensity focused ultrasound (HIFU) has been shown to fractionate a tissue into submicron-sized fragments in a process termed boiling histotripsy, wherein the focused ultrasound wave superheats the tissue at the focus, producing a millimetre-sized ...

A novel approach for the identification and dating of the fountain pen ink entries on paper has been established by ion-pairing high-performance liquid chromatography (IP-HPLC). Twelve black and six red fountain inks have been collected, and their ink entries have been prepared by drawing lines on paper. The chromatographic conditions for separation of their dye components after extraction with...

Abstract: Water quality assessment is a multivariate nonlinear system. Based on statistical learning theory, support vector machine (SVM) can transform the learning process into a convex quadratic planning problem to get a global optimization by using the rule of minimum structure risk, which is appropriate to solve small-sample, nonlinear classification and regression issues. Applying SVM in w...

When a light fluid is continuously released from the top (as fountain) or bottom plume) into box with opening, buoyant layer of constant thickness and density forms under ceiling at steady state. Both configurations have been investigated using theoretical approaches small scale air-helium experiments. As practical application, for fixed flux, fountain plume compared respect to their mixing eff...

we conducted environmental and laboratory investigations to elucidate the cause. Setting.\p=m-\Tourists traveling by bus through Alaska and the Yukon Territory of Canada. Participants.\p=m-\Staff of a restaurant at a business complex implicated as the outbreak source, convenience sample of persons on buses that had stopped there, and bus employees. Main Outcome Measures.\p=m-\Odds ratios (ORs) ...