Nonlinear static and dynamic response of a metastructure exhibiting quasi-zero-stiffness characteristics for vibration control: an experimental validation.

This work introduces a novel metastructure designed for quasi-zero-stiffness (QZS) properties based on the High Static and Low Dynamic Stiffness mechanism. The metastructure consists of four-unit cells arranged in parallel, each incorporating inclined beams and semicircular arches. Under vertical compression, the inclined beams exhibit buckling and snap-through behavior, contributing negative stiffness, while the semicircular arches provide positive stiffness through bending-dominated behavior.

Phosphorylated g-CN/sulfur self-doped g-CN homojunction carboxymethyl cellulose beads: An efficient photocatalyst for HO production.

The development of highly reusable, affordable, and durable photocatalysts for the production of hydrogen peroxide (HO) remained a challenge. In this study, a homojunction photocatalyst (SPGCN) is constructed between phosphorylated g-CN (PCN) and sulfur self-doped g-CN (SCN) using a simple wet impregnation method. Later, the obtained SPGCN homojunction is transformed into hydrogel beads using carboxymethyl cellulose via an effective cross-linking strategy (SPGCN/CMC).

Current scenario of CNG vehicular pollution and their possible abatement technologies: an overview.

Compressed natural gas is an alternative green fuel for automobile industry. Recently, the Indian government is targeting to replace all the conventional fuel vehicles by compressed natural gas (CNG) automobiles due to its several merits. Still, the presence of a significant amount of CO, CH, and NO gases in the CNG vehicle exhaust are quiet a matter of concern.

Elucidation of the role of guanidinium incorporation in single-crystalline MAPbI perovskite on ion migration and activation energy.

Ion migration plays a significant role in the overall stability and power conversion efficiency of perovskite solar cells (PSCs). This process was found to be influenced by the compositional engineering of the A-site cation in the perovskite crystal structure. However, the effect of partial A-site cation substitution in a methylammonium lead iodide (MAPbI) perovskite on the ion migration process and its activation energy is not fully understood.

Charge Accumulation, Recombination, and Their Associated Time Scale in Efficient (GUA) (MA) PbI-Based Perovskite Solar Cells.

Here, we study the influence of guanidinium (GUA) ions on the open-circuit voltage ( ) in the (GUA) (MA) PbI based perovskite solar cells. We demonstrate that incorporation of GUA forms electronic and ionic accumulation regions at the interface of the electron transporting layer and perovskite absorber layer. Our electrochemical impedance spectroscopy results prove that the formed accumulation region is associated with the enhanced surface charge capacitance and photovoltage.

Choice of precipitant and calcination temperature of precursor for synthesis of NiCoO for control of CO-CH emissions from CNG vehicles.

Compressed natural gas (CNG) is most appropriate an alternative of conventional fuel for automobiles. However, emissions of carbon-monoxide and methane from such vehicles adversely affect human health and environment. Consequently, to abate emissions from CNG vehicles, development of highly efficient and inexpensive catalysts is necessary.