To explore the effect of nano-attapulgite clay (NAC) on durability concrete, two kinds NAC (calcined raw ore and calcined high viscosity ore: calcination at 650 °C for 2 h) were used to study their effects mainly discussing changes chloride ion permeability resistivity concrete with NAC. The strength was analyzed by testing compressive concrete. two-electrode method, four-electrode tester analy...

A meta-analysis to mathematically summarize the effect of hot and cold temperature exposure on performance was completed. The results from 515 effect sizes calculated from 22 original studies suggest that hot and cold temperatures negatively impact performance on a wide range of cognitive-related tasks. More specifically, hot temperatures of 90 degrees F (32.22 degrees C) Web Bulb Globe Tempera...

background: labor pain is one of the severest pains that cause many women request cesarean section for fear of pain. thus, controlling labor pain is a major concern of maternity care. nowadays, interest in non-pharmacological pain relief methods has been increased because of their lower side effects. the effects of discrete heat and cold on decreasing labor pain have been reported but there was...

Adding mineral admixture is one of the leading technical ways to improve durability cement-based materials. Nano attapulgite clay (NAC) a unique fiber rod crystal structure that can change physical and mechanical properties materials, opens up new idea for exploring high-performance This paper studied effects NAC on hydration process, pore structure, cement substrate under different activation ...

Petroleum coke is processed into calcined coke in a rotary kiln, where the temperature profiles of flue gas and coke bed are highly nonuniform due to different flow and combustion mechanisms. Motivated by saving energy costs, the effect of refractory brick's thermal properties on potential energy savings is investigated. This study focuses on investigating potential energy savings by replacing ...