Arid grassland ecosystems have significant interannual variation in carbon exchange; however, it is unclear how environmental factors influence carbon exchange in different hydrological years. In this study, the eddy covariance technique was used to investigate the seasonal and interannual variability of CO₂ flux over a temperate desert steppe in Inner Mongolia, China from 2008 to 2010. The amo...

In this research, we investigate and discuss the characteristics of HoFeO3 nanoparticles synthesized by co-precipitation method at low temperature (t° ? 4 °C). The single-phase samples with orthorhombic structure formed after annealing precipitates different temperatures up to 950 °C. annealed have an average crystal size 10–20 nm (SEM, TEM). UV-Vis spectrum sample 750 °C showed strong UV Vis a...

the special application of iron-manganese oxide nanocatalysts has been investigated in decomposition of hydrogen peroxide. in this research, iron-manganese oxide nanocomposites were synthesized by co-precipitation, sol-gel and mechanochemical methods using iron (iii) nitrate, iron (ii) sulfate and manganese (ii) nitrate as starting materials. these nanocomposites were prepared on the various ca...

The objective of this work has been the co-precipitation of the coating material Ethyl Cellulose (EC) and two natural extracts (IDOKI SCF Technologies), R1 and P1, using the Supercritical Antisolvent (SAS) precipitation technique with supercritical carbon dioxide (SC-CO2), in order to obtain active microparticles. EC is a hydrophobic material widely used for controlled delivery systems, sustain...

High resolution multi-monochromatic measurements of auroral emissions have revealed the first optical evidence of co-existing small-scale auroral features resulting from separate high and low energy populations of precipitating electrons on the same field line. The features exhibit completely separate motion and morphology. From emission ratios and ion chemistry modeling, the average energy and...

This study examines the adsorption isotherms, kinetics and mechanisms of Pb²(+) sorption onto waste cow bone powder (WCBP) surfaces. The concentrations of Pb²(+) in the study range from 10 to 90 mg/L. Although the sorption data follow the Langmuir and Freundlich isotherm, a detailed examination reveals that surface sorption or complexation and co-precipitation are the most important mechanisms,...

Catalysts for methanol synthesis from CO2 and H2 have been produced by two main methods: co-precipitation and supercritical anti-solvent (SAS) precipitation. These two methods are compared, along with the behaviour of copper supported on Zn, Mg, Mn, and Ce oxides. Although the SAS method produces initially active material with high Cu specific surface area, they appear to be unstable during rea...