The main objective of this research is to manufacture expanded perlite (EP) foam-filled stainless steel tubes for energy absorption application and investigate their physical compressive behavior. Foam-filled (FFT) were manufactured by consolidating perlite/sodium silicate composite foam inside the tube. EP particles size 5-6 mm taken manufacturing FFTs. Two different sodium solution water (S/W...

This study presents a novel shock absorber with an inward-inverting composite foam-filled tube. Under the compression of pressing cap and action internal inversion cap, tube inverted inward. During crushing, fronds compacted foam, thereby enhancing energy absorption. Three types foams were applied to absorber, drop-weight impact test was performed obtain assessment parameters. The foam increase...

Superior vena cava (SVC) syndrome caused by malignant tumors in the upper mediastinum is not uncommon. Radiation therapy or endovascular treatment with stenting is the first choice of treatment to relieve symptoms. However, surgical treatment may be considered when the less invasive treatment modalities failed. In this report, we present two cases of severe symptomatic SVC syndrome as a result ...

Partially coating perpendicularly aligned carbon nanotube arrays with an appropriate polymer thin film along their tube length provides a novel concept for developing new sensors of high sensitivity, good selectivity, and excellent environmental stability for the detection of a broad class of chemical vapors with low power consumption. The absorption and desorption of chemical vapors by the pol...

Manufacturing and Testing techniques were investigated for the development of efficient joining of composite tubes. The stepped lap joining arrangements were studied. Finite element models were developed using ANSYS finite element code for predicting the stress distribution of the joint under the applied loads. Tubes made of graphite/epoxy were considered. The tubes were tested under both tensi...

A novel method is proposed to study the behavior and phase formation of a Si+C compacted pellet under centrifugal acceleration in a hybrid reaction. Si+C as elemental mixture in the form of a pellet is embedded in a centrifugal tube. The pellet assembly and tube are exposed to the sudden thermal energy of a thermite reaction resulted in a hybrid reaction. The hybrid reaction of thermite and Si+...

Building on our previous results (Ref. [4]), we study D-brane/string prototypes in weakly coupled (3+1)-dimensional supersymmetric field theory engineered to support (2+1)-dimensional domain walls, " non-Abelian " strings and various junctions. Our main but not exclusive task is the study of localization of non-Abelian gauge fields on the walls. The model we work with is N = 2 QCD, with the gau...

OBJECTIVE Biological aortic valve conduits are rarely used because of the concern that possible structural valve deterioration would require complete conduit replacement in a technically demanding operation. The aim of the study was to evaluate the 10-year experience with complete aortic-root replacement using a modified composite graft in which biological valve prosthesis was located inside th...

We report on theoretical and experimental results concerning the low-temperature specific heat of the frustrated spin-tube material [(CuCl(2)tachH(3)Cl]Cl(2) (tach denotes 1,3,5-triaminocyclohexane). This substance turns out to be an unusually perfect spin-tube system which allows to study the physics of quasi-one-dimensional antiferromagnetic structures in rather general terms. An analysis of ...

Because of the great demand for bacteriological examination of faecal specimens for Salmonella and Shigella organisms, there is need for a simplified biochemical method of preliminary differentiation of the Enterobacteriaceae to replace the widely used differential set of sugars involving inoculation of six or more tubes of separate media. The basic requirements of such a method are that it sho...