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Cavity wall

About: Cavity wall is a research topic. Over the lifetime, 3193 publications have been published within this topic receiving 24119 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, a ray-shooting approach is presented for calculating the interior radar cross section (RCS) from a partially open cavity, where a dense grid of rays is launched into the cavity through the opening.
Abstract: A ray-shooting approach is presented for calculating the interior radar cross section (RCS) from a partially open cavity. In the problem considered, a dense grid of rays is launched into the cavity through the opening. The rays bounce from the cavity walls based on the laws of geometrical optics and eventually exit the cavity via the aperture. The ray-bouncing method is based on tracking a large number of rays launched into the cavity through the opening and determining the geometrical optics field associated with each ray by taking into consideration: (1) the geometrical divergence factor, (2) polarization, and (3) material loading of the cavity walls. A physical optics scheme is then applied to compute the backscattered field from the exit rays. This method is so simple in concept that there is virtually no restriction on the shape or material loading of the cavity. Numerical results obtained by this method are compared with those for the modal analysis for a circular cylinder terminated by a PEC plate. RCS results for an S-bend circular cylinder generated on the Cray X-MP supercomputer show significant RCS reduction. Some of the limitations and possible extensions of this technique are discussed. >

831 citations

Patent
17 Aug 1992
TL;DR: A stabilizer member is a layer of malleable, shape-retaining material that is disposed on an external surface of tissue (T) forming the wall of an anatomical cavity to allow one or more medical instruments (I) to be inserted through the layer and into the anatomical cavity with the layer stabilizing the instruments(I) longitudinally and angularly relative to the cavity wall.
Abstract: A stabilizer member (20) includes a layer of malleable, shape-retaining material (22) to be disposed on an external surface of tissue (T) forming the wall of an anatomical cavity to allow one or more medical instruments (I) to be inserted through the layer (22) and into the anatomical cavity with the layer (22) stabilizing the instruments (I) longitudinally and angularly relative to the cavity wall. The malleable, shape-retaining properties of the layer (22) allow it to be shaped by a surgeon to a desired configuration to, in turn, provide the cavity wall with a desired configuration creating or increasing the size of a space within the anatomical cavity.

617 citations

Journal ArticleDOI
TL;DR: In this article, the growth of cavities along grain interfaces was analyzed by the combined processes of grain boundary diffusion and plastic dislocation creep in the adjoining grains, and it was shown that the coupling between the processes can be expressed in terms of a parameter L, which has the dimensions of length and which is a function of material properties, temperature and applied stress.

540 citations

Journal ArticleDOI
TL;DR: In this paper, a perfect fluid perturbation theory for axially symmetric cavities is proposed, which assumes that the pressure inside a cavitation bubble remains constant during the collapse process, and it is shown that the phenomenon of the cavity wall striking the solid boundary does indeed occur.
Abstract: A perfect fluid perturbation theory, which neglects the effect of gravity, and which assumes that the pressure inside a cavitation bubble remains constant during the collapse process, is given for the case of a non-hemispherical, but axially symmetric cavity which collapses in contact with a solid boundary. The theory suggests the possibility that such cavities may deform to the extent that the cavity wall strikes the solid surface before minimum cavity volume is reached. High speed motion pictures of cavities generated by spark methods are used to test the theory experimentally. It is found that the theory describes the change of shape of such cavities fairly well, and that the phenomenon of the cavity wall striking the solid boundary does indeed occur. By studying the damaging effects of various cavities of this type on aluminum samples, it is shown that pressures resulting from the cavity wall striking the surface are much higher than pressures caused by compression of gases inside the cavity. It is furthermore found that the estimated impact velocities of the cavity walls on the solid boundary can account for water hammer pressures sufficiently large to have caused the observed damage.

315 citations

Book
01 May 1993
TL;DR: The world of ancient masonry the world of modern masonry building design masonry materials behaviour of masonry assemblages reinforced beams and lintels flexural walls loadbearing walls under axial load and out-of-plane bending columns and pilasters shear walls infill walls and partitions masonry veneer and cavity walls connectors application of building science for environmental loads construction considerations and details design of loadbearing single storey masonry buildings.
Abstract: The world of ancient masonry the world of modern masonry building design masonry materials behaviour of masonry assemblages reinforced beams and lintels flexural walls loadbearing walls under axial load and out-of-plane bending columns and pilasters shear walls infill walls and partitions masonry veneer and cavity walls connectors application of building science for environmental loads construction considerations and details design of loadbearing single storey masonry buildings.

293 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202338
202262
202176
2020136
2019183
2018163