PURPOSE The purpose of the study was to investigate the optimal scanning protocol of 64-slice CT angiography for assessment of coronary artery stents based on a phantom study. MATERIALS AND METHODS Coronary stents with a diameter of 2.5mm was implanted in thin plastic tubes with an inner diameter of 3.0mm to simulate a coronary artery. The tubes were filled with iodinated contrast medium dilu...

From the *National Institute for Cancer Research, Section of Biotechnology, University of Rome "La Sapienza," Rome, Italy 00161; the ~Laboratory of Cellular and Molecular Biology, National Cancer Institute; and the w of Immunology, National Eye Institute, Bethesda, Maryland 20892; ][Department of Plastic Surgery and Reconstruction; ~[ Department of Experimental Medicine and Pathology, Universit...

From the *National Institute for Cancer Research, Section of Biotechnology, University of Rome "La Sapienza," Rome, Italy 00161; the ~Laboratory of Cellular and Molecular Biology, National Cancer Institute; and the w of Immunology, National Eye Institute, Bethesda, Maryland 20892; ][Department of Plastic Surgery and Reconstruction; ~[ Department of Experimental Medicine and Pathology, Universit...

A method is described for examination of the larynx in the histopathology laboratory. Using a slicing machine, transverse slices of the whole larynx are obtained from which representative histological samples may be prepared. This method offers the advantages of a complete gross examination of the normal and pathological structures of the larynx supplemented by histological studies using any of...

Among the disadvantages of catheter mounts in common use is that, as generally manufactured, they have sharp interior angles militating against laminar flow. The diagram illustrates the longitudinal section of a plastic variant in which the narrowing has been chamfered off. It has been found satisfactory in practice, and seems to be standing up robustly to use. It has the additional advantage o...

An inverse coefficient problem related to identification of the plasticity function g(η) from a given torque τ is studied for a circular section bar. Within the deformation theory of plasticity the mathematical model of torsion leads to the nonlinear Dirichlet problem −∇ · (g(|∇u|2)∇u) = 2φ, x ∈ Ω ⊂ R2; u(s) = 0, s ∈ ∂Ω . For determination of the unknown coefficient g(η) ∈ G, an integral of the...

For the design of steel and concrete structures, most modern international design codes allow the use of plastic stressstrain-diagrams for the analysis of the bending resistance of the cross-section in the ultimate limit state. Curiously, in Europe and most other parts of the world, timber structures are still designed for the ultimate limit state with the old, conservative concept of full elas...

This work is aimed to present an innovative technology for the reinforcement of beams for urban furniture, produced by in-mold extrusion of plastics from solid urban waste. This material, which is usually referred to as "recycled plastic lumber", is characterized by very poor mechanical properties, which results in high deflections under flexural loads, particularly under creep conditions. The ...

Abstract The paper provides a detailed analysis of innovative technologies for maintaining mine workings at great depths. possibility using composite materials (in particular, carbonfiber-reinforced plastic) as fastening elements is special attention. It has been conducted comparative the physical-mechanical properties carbon fiber-reinforced plastic and low-alloy steel, traditionally used manu...

The application of the finite element method to the inelastic analysis of structures and continua has received considerable attention over the last fifteen years [ 1-21 ]. To a large extent, this effort has been motivated by the need to safety and economically predict material response under conditions of extreme mechanical and thermal loading. Some examples are the design and analysis of press...