Uncertainty of measurement in spectrometric analysis: A case study

The methods of spectrometric analysis belong to a group of measurement methods that are used for their simplicity, speed of analysis, and large selectivity to solve various problems of analytes. Accuracy and reliability of any chemical analysis largely depend on the way the analyzed sample is prepared.     

Gold nanoparticles capped by peptides

Two dipeptides (GK and GC) and two 15-aminoacid peptides (GK15 and GC15) were used as capping agents in the preparation of monolayer-protected gold nanoparticles (MPCs). They were characterized by TEM microscopy, UV–vis, NMR and IR spectroscopy.     

Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability

Clean Technologies and Environmental Policy - Transformation of the heating sector is recognized as being essential for ensuring reliable and affordable energy services provided with reduced...     

Influence of thermal treatment on structure and microhardness of Fe75Ni2Si8B13C2 amorphous alloy

Correlation between hardness of amorphous Fe₇₅Ni₂Si₈B₁₃C₂ alloy and thermally induced structural transformations has been investigated by measuring microhardness in a series of samples heated at different temperatures from 25 to 1000 °C. The alloy has a relatively high hardness in the amorphous state, due to its chemical composition involving silicon, boron and carbon. As the alloy begins to crystallize, microhardness increased and reached a plateau in 500–650 °C temperature region, due to formation composite structure involving the small nanocrystals of α-Fe(Si) and Fe₂B phases dispersed in the amorphous matrix. After treatment at higher temperatures, the nanocomposite structure is replaced by a more granulated structure, leading to decline in microhardness.