Study on the immobile water of saturated compacted clay-rich materials by oil seepage.

Immobile water is defined as a firmly bound thin film of water surrounding clay particles that somehow resembles solid features. The characteristics and amount of immobile water depend on pore water chemistry, the type of clay, and the contact area of water with particles. Seepage can occur only when the hydraulic gradient increases sufficiently.

Effects of pH and EC on the strength and permeability of plastic concrete cutoff walls.

At present, plastic concrete is widely used in anti-seepage engineering, and its strength and hydraulic conductivity are important indexes of plastic concrete cutoff walls. The pondus hydrogenii (pH) and electrical conductivity (EC) have an important effect on the strength and hydraulic conductivity of plastic concrete cutoff walls. However, it is not clear why the pH and EC are related to the strength and permeability of these walls.

Medical students mental health, professional pride, and intention to work in the frontline during coronavirus disease 2019 pandemic.

Objectives: To understand medical students' mental health, professional pride, and intention to work in the front-line during coronavirus disease 2019 (COVID-19) pandemic, and provide a reference for psychological intervention.

Methods: We used the depression-anxiety-stress scale and self-designed questionnaire on professional pride, intention to work in the front-line and the extent of family support. Medical students from 4 medical schools in Fujian and Hunan were investigated.