Recent cetacean mass strandings in close temporal and spatial association with sonar activity has raised the concern that anthropogenic sound may harm breath-hold diving marine mammals. Necropsy results of the stranded whales have shown evidence of bubbles in the tissues, similar to those in human divers suffering from decompression sickness (DCS). It has been proposed that changes in behavior ...

Human sperm samples were prepared on a 30% Percoll gradient and reactive oxygen species (ROS) production was measured. In samples that generated ROS incubation under 95%O2:5%CO2 for 30 min decreased the proportion of spermatozoa capable of the stimulated acrosome reaction by 40% in comparison to samples incubated under 95%N2:5%CO2 (P< 0.001, repeated measures analysis of variance), but the degr...

Abstract The effect of CO on the gasification a Polish coal-derived char was investigated in fluidised bed from 1123 to 1248?K. Rate expressions developed Ergun's mechanism or modified three-step reaction mechanism, coupled with Cylindrical Pore Interpolation Model (CPIM) account for intra-particle mass transfer, were predict and CO. Compared rate expression, expression has an extra term pco, m...

The distribution of organic species is explored using data acquired from a new dual quadrupole system that routinely measures eighteen gaseous species. The process of condensation and its affect on gas distribution is modeled, and a new discrimination diagram based on total gaseous species and the CO2/N2 ratio is introduced. We conclude that organic species concentrations indicate source; that ...

Large amounts of CH4 in the form of solid hydrates are stored on continental margins and in permafrost regions. If these CH4 hydrates could be converted into CO2 hydrates, they would serve double duty as CH4 sources and CO2 storage sites. We explore here the swapping phenomenon occurring in structure I (sI) and structure II (sII) CH4 hydrate deposits through spectroscopic analyses and its poten...

Nitrogen-doped porous carbons with BET surface area of 1068.2–3314.5 m2/g and nitrogen contents 3.2–6.5% were prepared solid waste grape-seed as raw material, NaNH2 activator source at low activation temperature. Super The mechanism on hydrothermal carbon precursors was first explored by thermodynamic analysis TG-IR, which provided theoretical support for pore forming materials. Maximum CO2 CH4...

In an axisymmetric CO2-N2-H2O gas dynamic laser, let ? denote the intersection of the vertical plane of symmetry with the upper part of the (supersonic) nozzle. To obtain a maximal small signal gain, some authors have tested several families of curves for ?. To find the most general solution for ?, an application of Pontryagin’s principle led to the conjuncture that the optimal ? must consist o...

Abstract Low oil recovery which is very predominant in shale reservoirs has stimulated petroleum engineers to investigate the applications of enhanced methods these formations. One such application injection gases into formation stimulate increased recovery. In many gas flooding projects performed field, miscibility injected usually most desired displacement mechanism, and carbon dioxide (CO 2 ...

The purpose of this study was to evaluate a new method to measure closing volume (CV). This new method does not require oxygen or inert gases to be inhaled to obtain the onset of phase 4. Because there are regional differences in the concentrations of the resident alveolar gases (O2, CO2, and N2), there should be an abrupt change in the concentration of these gases at the terminal portion of a ...