نتایج جستجو برای: rectangular openings
تعداد نتایج: 27059 فیلتر نتایج به سال:
Abstract Based on the Rayleigh-Ritz method, transverse vibration characteristics of a rectangular plate with an arbitrarily shaped inner opening are investigated. A modified two-dimensional Fourier series was chosen as trial function and springs different stiffnesses were used to equate arbitrary boundary conditions plate. The Lagrange generalization open is obtained by equating area special fi...
Recently, there has been an increasing number of studies on the distortional buckling analyses cold-formed steel (CFS) channels with web edge-stiffened holes. However, literature about analytical solutions is scarce, and current design rules, e.g., American Iron Steel Institute (AISI 2016) Australian/New Zealand standards (AS/NZ 4600: 2018), provide little advice for CFS This paper presents met...
Many useful morphological filters are built as long concatenations of erosions and dilations: openings, closings, size distributions, sequential filters, etc. This paper proposes a new algorithm implementing morphological dilation and erosion of functions. It supports rectangular structuring element, runs in linear time w.r.t. the image size and constant time w.r.t. the structuring element size...
Following spatial disorientation, animals can reorient themselves by relying on geometric cues (metric and sense) specified both by the macroscopic surface layout of an enclosed space and prominent visual landmarks in arrays. Whether spatial reorientation in arrays of landmarks is based on explicit representation of the geometric cues is a matter of debate. Here we trained homing pigeons (Colum...
The objective of this Letter is to characterise the electromagnetic wave propagation between adjacent rooms in lower deck areas of ships. A wideband MIMO (Multiple-Input Multiple-Output) channel sounder has been used to realize double directional propagation measurements at 2.2 GHz. The antenna configuration was a linear array at the transmission side and a rectangular one at the reception. The...
A novel design for a waveguide band-rejection filter carrying high power in its pass band is presented. The resonant cavities of the filter are mounted in pairs on the narrow walls of the guide and coupled to the guide through rectangular openings the full height of the guide. Thus there are no edges or radii on which electric field concentrations can occur. An X-band model having six cavity pa...
To date, theoretical studies concerning the Carbon Fiber Reinforced Polymer (CFRP) strengthening of RC beams with openings have been rather limited. In addition, various numerical analyses presented so far have effectively simulated the behaviour of solid beam strengthened by FRP material. In this paper, a two dimensional nonlinear finite element analysis is presented to validate against the la...
A positive surge results from a sudden change in flow that increases the depth. It is the unsteady flow analogy of the stationary hydraulic jump and a geophysical application is the tidal bore. Positive surges are commonly studied using the method of characteristics and the Saint-Venant equations. The article presents the results from new experimental investigations conducted in a large rectang...
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