As instruments grow faster, leaders say clinical impact will depend on trust, standards, data, and assays built for real ...

Quantum properties of light are extremely delicate. When researchers attempt to measure them, even small losses on the way to ...

Perfluoroalkyl and polyfluoroalkyl substances (PFAS) are a class of synthetic chemicals widely used in industrial processes and consumer products because of their resistance to heat, water and oil.

Abstract: In this paper, equivalent electric circuit models of a commercial 1.2-kW proton exchange membrane (PEM) fuel cell stack are proposed based on AC impedance studies. The PEM fuel cell stack ...