The Earth’s N2-dominated atmosphere is a very special feature. Firstly, N2 as main gas unique on terrestrial planets in the inner Solar System and gives hint for tectonic activity. Studying origins of atmospheric nitrogen its stability provides insights into uniqueness habitat. Secondly, coexistence O2 within an unequaled entire System. Such combination strongly linked to existence aerobic life...

It is attempt in pulverized coal injection (PCI) in blast furnace tuyeres to increase the injection rate without increasing the amount of unburned char inside the stack of the blast furnace. The unburned char can cause problems in the blast furnace operation, such as reduced permeability, undesirable gas/temperature distribution, excessive coke erosion and significant char carryover. In the nea...

This paper reports a modelling work on the existing experimental data of single coal particles combustion process [1,2]. Two kinds of coal particles (a high-volatile bituminous coal / a lignite coal) are injected in a drop-tube furnace, ignited and burned in quiescent O2/N2 and O2/CO2 atmospheres with oxygen mole fraction varying from 20% to 100%. Ignition delay time, particle life time and par...

Trichodesmium is the dominant photoautotrophic dinitrogen (N2) fixer (diazotroph) in ocean. Iron an important factor limiting growth of marine diazotrophs including mainly because high iron content its N2-fixing enzyme, nitrogenase. However, it still lacks a quantitative understanding how dynamic allocation among physiological processes acts to regulate and N2 fixation Trichodesmium. Here, we c...

Background and Objectives: Edible parts of pomegranate fruits are a rich source of bioactive compounds. The present research examines the effect of modified atmosphere packaging on the fruit physico-chemical and microbial properties of two commercial pomegranate cultivars grown in Iran. Materials and Methods: The arils were packaged and stored under four different atmospheres. All of the pac...

Prostaglandin release from microvessels isolated from the rabbit cerebral cortex was determined under three different atmospheric conditions: 100% O2 ("O2") room air, and 95% N2=5% CO2 ("N2-COj"). Initial studies with homogenates prepared from rabbit cerebral microvessels (RCMV) indicated two pathways of enzymatic PGH2 transformation, namely PGI2 synthase and GSH-dependent PGHPGE isomerase. We ...

First-principles quantum calculations are potentially of great value for assessing the plausibility of proposed catalytic reaction mechanisms. The present analysis of reaction pathways and energetics for key elementary steps in the catalytic decomposition of NO to N2 + O2 by Cu-exchanged zeolites yields novel insights into this widely studied reaction. We find evidence for a pathway involving t...

This study compares the Isis II satellite measurements of the electron density and temperature, the integral airglow intensity and volume emission rate at 630 nm in the SAR arc region, observed at dusk on 4 August, 1972, in the Southern Hemisphere, during the main phase of the geomagnetic storm. The model results were obtained using the time dependent one-dimensional mathematical model of the E...