Solids can be cooled by driving impurity ions with lasers, allowing them to transfer heat from the lattice phonons to the electromagnetic surroundings.This exemplifies a quantum thermal machine, which uses a quantum system as a working medium to transfer heat between reservoirs.We review the derivation of the Bloch-Redfield equation for a quantum s

The aim of this work is to evaluate the effect of adding different types of fibers on the fresh properties of the self-compacting concrete, SCC.The used types of fibers were steel (with volume ratios of 0.75, 1.0 and 1.25 %) and polypropylene fibers wilwood .75 master cylinder (0.10 and 0.15 %) and a hybrid system of these fibers (0.65 % steel and

Obesity is characterized by an increase in body weight associated with an exaggerated enlargement of the adipose tissue.Obesity has serious negative effects because it is associated with multiple pathological complications such as type 2 diabetes mellitus, cardiovascular diseases, cancer, and COVID-19.Nowadays, 39% of the world population is obese

Wettability alteration has been a sophisticated issue for scientists and reservoir engineers since early 20th century; thus, many investigations have been carried out to determine wettability and enhance it to ideal conditions, which leads to improvement in oil recovery.Dilute surfactant flooding has been approved oceane eau de toilette as one of t

In 1073spx this article, we provide a brief introduction to the special issue on research ethics in qualitative research.We describe the general context within which our idea emerged to organize a special issue and present its design and, for purposes of transparency, some particulars with respect to the selection and review process.We sketch some