This gave a different set of relative masses for the elements. The inadequacy of oxygen as an arbitary standard led to the selection of the carbon-12 isotope of carbon as the arbitary standard. The relative atomic mass of an element is defined as the weight in grams of the number of ...
The theory for the determination of relative mass from darkfield electron micrographs is derived, and its limitations are indicated. For our geometry of darkfield apertures and at a beam voltage of 80 kV, a linear relationship between the scattering mass density and the density on the photographic...
1. The act of responding. 2. A reply or an answer. 3. A reaction, as that of an organism or a mechanism, to a specific stimulus: a microphone's response to certain frequencies; response by the immune system to a pathogen. 4. a. Ecclesiastical Something that is spoken or sung by ...
This is a preview of subscription content, log in via an institution to check access. Rights and permissions Reprints and permissions About this article Cite this article Das, A.K. On the quantum of cosmic radiation and the relative mass of proton and electron. Naturwissenschaften 17, 841 (...
An earlier electron-beam ion-trap (EBIT) lifetime measurement of the Ne[sup 8+] 1s2s hthinsp;[sup 3]S[sub 1] level has been improved upon, reducing the unc... E. Trbert,P Beiersdorfer,G. Brown,... - 《Physical Review A》 被引量: 48发表: 1999年 On the Properties of the Gre...
the feelings felt and the judgements reached when an individual or members of a group compare themselves – and especially their social situation -adversely with some other individual within their group or with another group, e.g. the less well-off members of an occupational group with the more...
underlying the of archaeal genes putatively encoding the ammonia species or operational taxonomic unit (OTU) level, monooxygenase subunit A (amoA) strongly supports which is usually considered to be at X97–98% the interpretation that at least a large fraction of the nucleotide identity at this ...
This design allowed a direct comparison of the strength of the different factors on food web properties and ecosystem functioning (i.e., system-level fluxes of energy or matter), and an evaluation of how the factors may interact. Systems with higher snail species richness had greater secondary ...
The abundance mass spectra show that all clusters with an electron shell closing are magic, which demonstrates that the enhanced stabilities are correlated with the electronic shell structure. No enhanced abundance is observed at N = 55, where an icosahedral geometric shell closing is expected, ...
The Coulomb force and the finite mass of the electrons combine to give an ideal plasma a dispersion in the relative permittivity, ε˜(ω), given by [7]ε˜(ω)=1−ωp2ω2 where the plasma frequency is defined by ωp2=ρe2/ε0me,ρ is the number density of electrons, e is ...