King Fahd University of Petroleum and Minerals

Design of a Pyrrolidine–QuaternaryAmmoniumCyclocopolymer as a Nonbiocidal Corrosion Inhibitor for Mild Steelin 15 wt % HCl

Abstract 15 wt % HCl used in oil and gas acidizing operations causes severe corrosion to operational pipelines and tubing. In this work, a pyrrolidine- and quaternary ammonium salt-based cyclocopolymer (PCP) has been synthesized as an efficient corrosion inhibitor for mild steel...

M-quad: an anomalous force-routing mechanical metamaterial

Most mechanical metamaterials (MMs) are optimized to absorb or sustain loads along a single path, limiting force-trajectory control. Herein, we introduce a novel multimaterial MM (M-quad) that actively routes a compressive force into the lateral and return pathways. Each unit cel...

Transient recovery voltage for load current switching test of MV load break switch

Switchgear manufacturers and type testing laboratories conduct the active load-current switching test of MV interrupter switches (load break switch or disconnector) following the guidelines of either the IEEE or IEC standards. However, the testing guidelines defined by these two...

Comparative assessment of OPC and portland composite cements on the rheology and strength of nylon fiber-modified self-compacting concrete

Abstract This study investigates the combined effects of Portland composite cement type and nylon fiber dosage on the fresh-property compliance and 28-day mechanical performance of self-compacting concrete (SCC). An empirical SCC proportioning approach was adopted. Four OPC-based...