1.4.1 Unstable nuclei Figure 1.2 gives the combinations of protons and neutrons that are found to be stable nuclei. This information may also be presented as an area of stability, Fig 1.4. Nuclei lying outside this area may be regarded as having the wrong combination of protons and neutrons...
The high abundance of the relatively thermally unstable C20 tetracyclic diterpanes (Fig. 4) also indicate that the maturity is below the level for thermal cracking (Dzou and Hughes, 1993; Powell and Snowdon, 1983). This indicates that maturity is not the cause of the variations in bulk and...
Ferry and Dipple1992; Todd and Evans1993; and above). Infiltration of water-rich fluids into limestones was often found to be limited, whereas interbedded quartz-rich layers and calcareous argillites acted as aquifers (e.g., Nabelek et al.1984). In particular, transport...
The applications of stable isotopes in metabolomics have facilitated the study of cell metabolisms. Stable isotope-assisted metabolomics requires: (1) properly designed tracer experiments; (2) stringent sampling and quenching protocols to minimize isotop
Keywords: stable isotopes;δ13C;δ18O;mortars;mineralogy;degradation Graphical Abstract
However, the multiyear average contribution of groundwater to the lake was very small (only 3.96%); that is, there was no strong interaction between groundwater and the lake. Furthermore, the annual variation in the contribution of groundwater appeared very unstable, which may be closely ...
[10] believed that soil erosion breaks the surface soil aggregates and other structures, and unstable carbon is deposited at a lower place with soil particles subjected to runoff, soil midflow, gravity, and other factors. However, the change trend of each index from A1 to A2 showed an ...