Atomic Weight and Isotopic Composition of Oxygen and Their Variation in NatureOxygenOxygen IsotopesIsotope RatioAirBibliographiesIceMass NumberStandardsWaterThere is a problem with the absolute abundance measurements of oxygen. One of these calibrated measurements is in error, either oxygen in air, or ...
The ionized form of atomic oxygen (O+) is the dominant ion species at the altitude of maximum electron density in only one of the many ionospheres in our Solar System 鈥?Earth鈥檚. This ionospheric composition would not be present if oxygenic photosynthesis was not an ongoing mechanism that ...
combining weight,eq,equivalent weight,equivalent- the atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen meq,milliequivalent- one-thousandth of an equivalent
摘要: Different solvents used as dispersion media in the sample preparation of MXenes provoke changes in the material roughness and dispersibility as well as particle oxidation, resulting in different overpotential values for the catalytic hydrogen evolution reaction....
Experimental/ atmospheric compositionatmospheric spectramesospherenightglowoxygenvisible spectra/ O Iatomic oxygen concentrationsrocket airglow observationsequatorial regionmesosphereA rocket payload designed to measure mesospheric sodium, hydroxyl and oxygen nightglow emissions, in addition to electron density and ...
Applying the Condensation Particle Counter Battery (CPCB) to study the water-affinity of freshly-formed 2-9 nm particles in boreal forest Measurements on the composition of nanometersized atmospheric particles are the key to understand which vapors participate in the secondary aerosol formati... Riip...
atmospheric composition and structuremiddle atmospherecomposition and chemistryThe influence of atomic oxygen concentration on the height distribution of the main positive and negative ions and on electron density in the mesosphere is studied for the conditions prevailing during the solar proton event on ...
chemistry, thesciencethat deals with the properties,composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and theenergythat is released or absorbed during these processes. Every substance, whether naturally occurring or artificially produced, consist...
Although the two scales differed only slightly, the ratio between them could not be fixed exactly, because of the slight variations in the isotopic composition of natural oxygen from different sources. It was also considered undesirable to have two different but closely related scales dealing with ...
(1) the need to develop a reliable predictive model of the effects of long-term exposure of materials to the LEO environment; (2) the ability of ground-based exposure facilities to provide useful data for development of durable materials; and (3) accurate determination of the composition of ...