Single-wall fullerene nanotubes were converted from nearly endless, highly tangled ropes into short, open-ended pipes that behave as individual macromolecules. Raw nanotube material was purified in large batches, and the ropes were cut into 100- to 300-nanometer lengths. The resulting pieces formed a stable colloidal suspension in water with the help of surfactants. These suspensions permit a v...

The permanent metal joining processes play a vital role in assembling the complex aluminium structures of aerospace, automotive, marine, and oil industries. invention friction stir welding (FSW) redefined mechanism to produce high-quality welds by eliminating consumption electrodes shielding gases, resulting economical processes. Research works still lack explore application FSW geometries. In ...

Half a century ago Richard Skalak (1923-1997) (Ref 1) published a paper with the title "An extension of the theory of water hammer" (Refs 2, 3, 4), which has been the basis of much subsequent work on hydraulic transients with fluid-structure interaction. The paper considers the propagation of pressure waves in liquid-filled pipes and the coupled radial/axial response of the pipe walls. In a tri...

The coupled-bunch beam breakup (bbu) problem in a periodic linac excited by the resonance wake is well understood [1–3]. However, there are no systematic studies for the corresponding problem excited by the resistive wall impedance. This study of the resistive wall bbu problem is necessitated by the recently proposed PERL project [4]. For PERL, the light source consists of twelve undulators, ea...

A series of experiments were conducted to investigate the flow pattern transitions and water holdup during oil–water–gas three-phase considering both a horizontal section vertical transportation pipe simultaneously. The flowing media white mineral oil, distilled water, air. Dimensionless numbers controlling multiphase deduced understand scaling law process. was simplified as two-phase gas liqui...

The growths of oil and gas exploration and production activities have increased environmental problems, such as oil spillage and the resulting pollution. The study of the methods for cleaning up oil spills is a critical issue to protect the environment. Various techniques are available to contain oil spills, but they are typically time consuming, energy inefficient and create secondary pollutio...

Through the study of a linear problem, this paper introduces some of the ingredients that are needed in order to conduct efficient nonlinear calculations on composite pipes under thermomechanical loading in the presence of defects. Based on the observation that the main degradation scenarios take place at the extremity of a pipe, a refined model is used to describe this end zone while the rest ...

In this demo we present a first implementation of Semantic Web Pipes, a powerful tool to build RDF-based mashups. Semantic Web pipes are defined in XML and when executed they fetch RDF graphs on the Web, operate on them, and produce an RDF output which is itself accessible via a stable URL. Humans can also use pipes directly thanks to HTML wrapping of the pipe parameters and outputs. The implem...

The research presented in this thesis is concerned with the flow behaviour of two-phase, liquid-liquid, oil-water flow through horizontal pipes. The test liquids used were oil (density 828kg/rn 3, viscosity 6x iO 3 Pa s) and water, with experiments carried out in a purpose built test facility with a stainless steel pipe (internal dia. 38mm, length 8m). Visual observation of the flow was possibl...

Piper aduncum L. is used in folk medicine to treat respiratory and inflammatory diseases. The aim of this study was to analyze the essential oil from leaves of P. aduncum collected in the Brazilian Cerrado, North of Minas Gerais, as well as to evaluate the larvicidal activity of this oil and of its major constituent. The essential oil was analyzed by gas chromatography coupled to flame ionizati...