Sedative Effect of White Noise on Prefrontal Cortex Lobe: A Randomized Controlled Study Based on Functional Near-Infrared Spectroscopy.

Background: White noise has attracted widespread attention due to its potential effects on psychological and physiological states, particularly in promoting relaxation. The prefrontal cortex, a critical region of the brain responsible for higher cognitive functions and emotional regulation, may influence an individual's mental and physical health through its responses to external stimuli. Although previous research has investigated the calming effects of white noise, systematic studies on its specific impact on prefrontal cortex activity are still lacking.

[Effect on Ammonia Inhibition Mitigation in the Anaerobic Digestion Process with Zero-Valent Iron].

Ammonia inhibition is an important factor impacting methane production efficiency during the anaerobic digestion of high-solid organic wastes. This study investigated the effect of micro-sized zero-valent iron (m-ZVI) on the anaerobic digestion of excess sewage sludge and thermal hydrolyzed sludge using batch mode experiments. The effect of m-ZVI on ammonia inhibition mitigation was also studied.

[Effect of Sulfate on the Migration and Transformation of Methylmercury in Advanced Anaerobic Digestion of Sludge].

To study the migration and transformation of methylmercury during advanced anaerobic digestion of sludge and the role of sulfate, this study investigated the migration and transformation of methylmercury during different stages of sludge anaerobic digestion (AD) with thermal hydrolysis pretreatment and under different dosages of sulfate addition. The results showed that mercury methylation occurred in the initial stage of AD (Day 1-3), the ratio of methylmercury to total mercury increased from 0.024% (range of 0.