Large Area Avalanche Photodiodes (LAAPDs) were used for a series of systematic measurements of the scintillation light in Ar, Kr, and Xe gas. Absolute quantum efficiencies are derived. Values for Xe and Kr are consistent with those given by the manufacturer. For the first time we show that argon scintillation (128 nm) can be detected at a quantum efficiency above 40%. Low-pressure argon gas is ...

We investigate the role of carrier gases in the production of metastable argon atoms in a rf-driven discharge. The effects of different carrier gases (krypton, xenon, neon, and helium), carrier gas pressures, and rf discharge powers are examined. A xenon carrier gas provides the greatest metastable population of argon, yielding an optimal fractional metastable population of argon (Ar(*)/Ar) of ...

A modified indicator gas washout method was developed to measure functional residual capacity (FRC) during high-frequency oscillatory ventilation (HFOV) without interruption of HFOV. A hot-wire flowmeter and medical gas analyzer measured the flow rate and argon concentration, respectively, at the expiratory end of the respiratory circuit. Upstream of the hot-wire flowmeter, two heat-and-moistur...

Two detection systems for gas-liquid chromatography were compared for the identification of metabolic end products (short-chain organic acids) from anaerobic bacteria. Argon and flame ionization detectors were connected in series with inert argon as the carrier gas for analysis of 35 stock strains and 148 clinical isolates. There was an excellent correlation between the argon and flame ionizati...

In modern industrial applications like automobile manufacturing, shipbuilding, and aircraft construction. Aluminum alloy is employed to obtain a cost favorable, corrosion-resistant, weight optimized body which provides high stiffness. This paper aims find the influence of Process parameters welding current, Filler rod diameter, Gas flow rate on tensile strength TIG welded AA6082 using ER 4047 f...

UNLABELLED Hypothermia is ineffective in 45% of neonates with hypoxic-ischemic encephalopathy. Xenon has additive neuroprotective properties, but is expensive, and its application complicated. Argon gas is cheaper, easier to apply, and also has neuroprotective properties in experimental settings. The aim was to explore the safety of argon ventilation in newborn piglets. METHODS Eight newborn ...

The argon beam coagulator (ABC) is often used for hemostasis during and after surgery on parenchymatous organs. In experienced hands, ABC is considered to be a relatively safe tool. However, “the possibility that the flow of argon gas onto bleeding tissue may cause venous gas embolism” is an important safety consideration (1). It is known that when ABC systems are used in closed cavities, such ...

Abstract Engineering in vacuum or under a protective atmosphere permits the production of materials, wherever absence oxygen is an essential demand for successful processing. However, very few studies have provided quantitative evidence effect oxidized surfaces to tribological properties. In current study on 99.99% pure copper, it revealed that tribo-oxidation and resulting increased abrasive w...

While developing a liquid argon detector for dark matter searches we investigate the influence of air contamination on the VUV scintillation yield in gaseous argon at atmospheric pressure. We determine with a radioactive αsource the photon yield for various partial air pressures and different reflectors and wavelength shifters. We find for the fast scintillation component a time constant τ1 = 1...