Near-infrared spectroscopy (λrest ∼ 3700–6800 Å) of eight high redshift powerful radio galaxies (HzPRGs) at z = 2.2 − 2.6 is presented. Strong forbidden lines and Hα emission were detected in all sources; the data show evidence that the emission lines of the HzPRGs may contribute a substantial fraction (∼ 25–98 %) of their total observed Hand/or K-band light. Diagnostic emission-line ratios – [...

BACKGROUND The 2 × 2 factorial design is widely used for assessing the existence of interaction and the extent of generalizability of two factors where each factor had only two levels. Accordingly, research problems associated with the main effects and interaction effects can be analyzed with the selected linear contrasts. METHODS To correct for the potential heterogeneity of variance structu...

The ongoing COVID-19 pandemic has pushed scientists and technologists to find novel strategies develop new materials prevent the transmission, spread, entry of pathogens into human body. In this report, fabrication polyvinyl chloride (PVC)-SiO2-Ag composite is presented, in which percentage Ag 0.84% wt. Our findings render that eliminates (> 99.8%) bacteria fungus (Staphylococcus aureus, Escher...