APPLIED PHYSICS: Squeeze Play

Applied Physics

A portable modular gas sensor for measuring the 13 C/ 12 C isotopic ratio in CO 2 with a precision of 0.8%o(±1σ) was developed for volcanic gas emission studies. This sensor employed a difference frequency generation (DFG)-based spectroscopic source operating at 4.35 µm (∼ 2300 cm −1) in combination with a dual-chamber gas absorption cell. Direct absorption spectroscopy using this specially des...

Acetylcholine and coronary artery spasm: important insight or squeeze play?

For over 100 years, ergot alkaloids have been known to be powerful vasoconstrictor agents, even capable of causing gangrene (1). In the late 1940s, intravenous administration of ergotamine to patients with "organic heart disease" s found to cause electrocardiographic (ECG) changes and chest pain, believed to represent a direct vasoconstrictor effect of ergotamine on the coronary arteries, Stein...

Applied Physics Letters

A simple technique is explored to determine the temporal photo-response, s, of individual semiconducting SiC and Si nanowires (NWs), with a high time resolution. Laser-assisted field emission (LAFE) from the NWs is first shown to be highly sensitive to continuous laser illumination. Pulsed illumination is then combined with measurements of the total energy distributions to determine s which wer...

Physics Applied to Anaesthesia

Applied Physics A