This study proposes the surface-perforated mortar (SPM) to mitigate railway noise. As one of most emerging noise problems, deteriorates quality human lives. paper investigates sound absorption performance SPM and it is compared that porous concrete which has been adopted as a potential solution for The effects hole size depth, surface porosity on examined using an in-situ test results explain m...

The concept of the surface impedance is applicable to the case, when obstacles on the surface of a vacuum chamber are small compared to characteristic dimensions of the problem. We apply this concept to the calculation of a synchronous mode that can propagate in a tube with slightly corrugated walls. We also show that such a mode can propagate in a pipe with a rough surface, or a perforated pip...

We show that a graphene sheet perforated with microor nano-size antidots have prominent absorption resonances in the microwave and terahertz regions. These resonances correspond to surface plasmons of a continuous sheet “perturbed” by a lattice. They are excited in different diffraction orders, in contrast to cavity surface plasmon modes existing in disconnected graphene structures. The resonan...

This article was accepted: 19 August 2011 Corresponding Author: Faizah Mohd Zaki, Department of Radiology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Center, Jalan Yaaacob Latiff, Cheras, Kuala Lumpur, 56100, Malaysia Email: [email protected] INTRODUCTION Bochadalek hernia is due to improper fusion of the posterolateral foramina of the diaphragm, which was first described...

OBJECTIVE To compare postoperative vaginal incision separation and healing in patients undergoing posterior repair with perforated porcine dermal grafts with those that received grafts without perforations. Secondarily, the tensile properties of the perforated and non-perforated grafts were measured and compared. MATERIALS AND METHODS This was a non-randomized retrospective cohort analysis of...

Watercress is a leafy vegetable of the family Brassicaceae that grows in and around water, it has a short shelf life (approximately seven days) and it is consumed raw or steamed. The objective of this work was to study the effect of packaging film and different storage temperature on the postharvest quality of watercress minimally processed. Treatments were: packed with plain film (PD961EZ, 31m...

We review a series of experiments on the optical properties of metal films perforated with arrays of sub-wavelength holes. A key experiment is the transfer of polarization entanglement under plane-wave/focused illumination, where we observed a conservation/degradation of the quantum entanglement. Surface plasmons play a prominent role in the observed extra-ordinary large transmission. This is d...

Abstract The paper is devoted to the close investigation of flow over perforated suction section in presence three-dimensional roughness element. Measurements were conducted surface straight wing with and without suction. It was shown that distributed allows diminishing intensity longitudinal structure. Also boundaries effective usage found.

The objective of the paper is a numerical study of heat transfer between perforated metal plates and the surrounding air flows. Different perforation structures can nowadays be found in various industrial products. Besides improving the mechanical properties, the perforations can intensify the heat transfer as well. The heat transfer coefficient depends on a wide range of parameters such as typ...