Recent studies on increasing the thermal-hydrodynamic efficiency of solar air collectors have been carried out installation barriers various shapes surface absorber, and this method ensures a significant increase in energy collector. The transfer flow washing absorber from laminar state to an accelerated lumped is by installing obstacles. Installation main factor heat prolongs time barrier coll...

By combining the 3D printing, electroplating and chemical vapor deposition processes we fabricated “bubble wrap” polymer nanomembrane covered with multilayered graphene. Such a metasurface composed of array graphene hemispheres shows extremely broadband almost perfect absorption in terahertz (THz)2 frequency range being robust against macroscopic structural defects including holes volcanic-like...

Due to the increasing demand for eco-friendly, inexpensive sound absorbers, this study investigated composites made from recycled paper pulp and urea-formaldehyde adhesive. By varying contents, five samples used copy corrugated board were fabricated. For same type of porous absorber, one with a lower bulk density has higher total porosity, resulting in absorption coefficient (SAC) spectrum. Sou...

Flat plate collectors (FPCs) are the leading solar thermal technology for low-medium range temperature applications. However, their expansion in developing countries is still lacking because of poor performance. Improving performance flat a crucial concern addressed this review This study comprehensively discussed improvement methods FPCs, such as design modification, reflectors, working fluid,...

The purpose of this study is to investigate the possibility improving electrical (cell) efficiency, thermal and overall performance by adding w-rib roughness bottom absorber plate. plate being given roughness. Based on a mathematical simulation PV/T system as function pertinent geometrical parameters, such relative pitch, height, angle attack, well design temperature rise insolation, parameters...

Lately, Corrugated Steel Plate Shear Walls (CSPSWs) have gained significance and reputation for being effective lateral force-resisting systems. plates are characterized by greater out-of-plane stiffness buckling stability than flat plates, ensuring their enhanced hysteretic behavior. In ordinary (SPSWs), infill fixed to beams columns. But, detaching the plate from columns connecting it only is...

The use of the phase change material (PCM) as a storage medium represents an important advance to store energy for absorption cooling systems when solar is not available; however, temperature tank key parameter adequate operation system. This paper presents parametric analysis flat and commercial plate heat exchangers with MgCl2·6H2O PCM at conditions. exchanger (PHE) chevron type angle 45° are...

Generation of powerful ultrashort microwave pulses (USP) is of interest for a large number of practical applications, including radars with high resolution, plasma diagnostics, spectroscopy etc. In order to achieve this purpose many methods well-known in laser physics can be implemented in microwave electronics. In the last decade significant progress was achieved in generation of microwave USP...

An integral reactor design methodology was developed to address the optimal design of photocatalytic wall reactors to be used in air pollution control. For a target pollutant to be eliminated from an air stream, the proposed methodology is initiated with a mechanistic derived reaction rate. The determination of intrinsic kinetic parameters is associated with the use of a simple geometry laborat...

In order to study the anti-penetration performance of corrugated plate/aluminum foam composite sandwich structure, LS-DYNA software was used simulate. The penetration model 7.62 mm rifle bullet into structure established, and residual velocities bullets at five positions were compared analyzed. influence different initial velocity forward 900m/s angle on B is focused. results show that position...