For the purposes of a research upon the effects on the respiratory exchanges and metabolism of varying the percentage of oxygen in the air breathed, a specially constructed apparatus was devised in which animals under experiment (usually cats) could be kept for as long a period as was desired in an atmosphere containing a constant percentage of oxygen, the carbon-dioxide produced by the animal ...

Life cycle assessment (LCA) involves many temporal issues. It is necessary to make a clear distinction between long-term impacts and short-term impacts, especially for those structures with long service life, such as buildings. With their long service life of 50 years, a great deal of maintenance and repairs could be conducted, causing a respective environmental impact. In this paper we explore...

The objective of this study is to predict the percentage dilution in AISI 1020 low carbon steel welds produced from tungsten inert gas welding using Artificial Neural Networking (ANN) approach. regression plot showed R = 0.9992 as progress training, 0.99865 validation and 0.85285 training test. This led overall correlation coefficient (R) 0.90007 which signified that ANN a robust tool for predi...

1. The oxygen content of venous and of arterial blood from fifteen essentially normal individuals at rest in bed has been determined. 2. The percentage saturation of the arterial blood has varied between 100 and 94.3. The average is 95.5 per cent. 3. The oxygen consumption has varied between 2.6 and 8.3 volumes per cent. 4. The oxygen content and the percentage saturation of arterial blood take...

the field study was conducted in one district of educational-experimental forest at tehran university (kheirood-kenar forest) in the north of iran. eighty-five soil profiles were dug in the site of study and several chemical and physical soil properties were considered. these factors included: soil ph, soil texture, bulk density, organic carbon, total nitrogen, extractable phosphorus and depth ...

Background: Multiple beams are generally used with an increased possibility that the beam axis intersects the treatment table. Treatment tabletops are commonly made of carbon fiber due to its high mechanical strength and rigidity, low specific density, extremely light and low radiation beam attenuation properties. Purpose of this paper is investigated the dose changes in the buildup region and ...