The need to improve the understanding of properties cement-based materials calls for development tools visualizing and quantifying chemical reactions flows fluids within them. In this paper, we report results an experimental study where a sample fractured cement-paste was subjected injection (krypton, CO2 water) imaged simultaneously by X-ray computed tomography (CT). Initial porosity estimated...

Abstract A high liquid krypton purity level is essential for the NA62 calorimeter at CERN to ensure long lifetimes of ionization electrons in detector. small time projection chamber (TPC) system was developed enable measurement oxygen equivalent ppb level. This paper describes dedicated cryogenic setup and procedures required operate monitor system, while guaranteeing condensation 119 K without...

The optical radiation in a gaseous medium upon the irradiation of lithium layer with fast electron beam 5 ns duration has been studied. chamber was filled argon, krypton, or xenon at pressure 10 kPa up to 60 kPa. lines atoms appear emission spectrum temperature 650–680 K, and intensity these sharply increases increasing layer. arises from both transitions noble gas transition atom time about 20...

IN RECENT years the efforts of many groups have been directed to the development of more refined methods for the precise characterization of cardiac shunts. The application of inhaled foreign gases and the various extensions and improvements in the dye dilution method have already proved of considerable value in the study of patients with congenital heart disease.1 In the course of clinical stu...

The demands placed on a knowledge representation scheme by a knowledge-based system are generally not all met by any of today’s candidates. Representation languages based on frames or semantic networks have intuitive appeal for forming descriptions but tend to have severely limited assertional power, and are often fraught with ambiguous readings. Those based on first-order logic are less limite...