Perforated wooden panels are typically utilized as a resonant sound absorbing material in indoor noise control. In this paper, the absorption properties of wooden panels perforated with tiny holes of 1-3 mm diameter were studied both experimentally and theoretically. The Maa-MPP (micro perforated panels) model and the Maa-Flex model were applied to predict the absorption regularities of finely ...

In this paper, the effect of elliptical shape openings was numerically compared to the case when circular openings were used in the steel panel shear walls. At first, the finite element model in ABAQUS was calibrated by experimental results, obtained from previous studies. Then, three steel shear panels with different sizes of elliptical openings were analyzed under cyclic loads, and the result...

Non-human animals and human children can make use of the geometric shape of an environment for spatial reorientation and in some circumstances reliance on purely geometric information (metric properties of surfaces and sense) can overcome the use of local featural cues. Little is known as to whether the use of geometric information is in some way reliant on past experience or, as would likely b...

In this study, thermodynamic and economic analysis of a photovoltaic electricity generation system (PVEGS) with and without self-cleaning panels is reported. In the first part, thermodynamic analyses are used to characterize the performance of the system. In the second part, the economic comparison of photovoltaic electricity generation with and without self-cleaning panels is carried out for a...

This study aims to investigate the thermo-acoustic and hygrothermal properties of innovative panels made leather waste produced by a bag factory from circular economy perspective. Their performance was compared with other residual-based insulation panels. The scraps were chipped three boards fabricated means mold different compositions, adding adhesive glue. In order improve sustainability aspe...

The study aims to show effect of adding the circular perforated plates in sedimentation basin horizontal position on efficiency as was use panels with holes and placed inside took two levels turbidity water 125 150 NTU respectively Tigris river during preparation variable hydraulic load calculated at each case where variables that were adopted is number so ratio area holes/total panel 20% , als...

Abstract Building prefabrication is facing the challenge to reduce life-cycle impact of construction, enhance material circularity, and increase quality building products processes. The paper presents first phase research CARES - CArdboard RElocatable School developed with Italian brand Archicart by Area S.r.l aim prototype a temporary school unit. work presented focused on industrialization pr...

automobile body plays crucial role in preventing the collision energy transfer in severe accidents to the passengers. if the collision energy is dissipated or saved in bumper or chassis, the amount of damage to the occupants would be minimized. using novel laminated panel (fiber metal laminate) in auto body, and considering the characteristics such as high energy absorption, strength, high dent...