The influence of pad facing material on hydrodynamic lubrication in tilting-pad thrustbearings is investigated in terms of pad and oil-film temperatures and oil-film thickness. Two tilting-pad thrust bearings are examined: one with babbitt pad facing, the other with a layer of a PTFE based composite material. Frictional torque, pad, collar and oil-film temperatures and oil-film thicknes...

Metal/fluoropolymer composites represent a new category of energetic structural materials that release energy through exothermic chemical reactions initiated under shock loading conditions. This paper describes an experiment designed to study the reaction characteristics of energetic materials with low porosity under explosive loading. Three PTFE (polytetrafluoroethylene)/Ti/W mixtures with dif...

over a seven year period from 1982 to 1989,3337 conduits were created in 3137 patients with end stage renal disease (esrd) as access for chronic dialysis. these included 2690 side-to-side arteriovenous fistulae (a vf), 168 end-to-side a vfs, 10 autogenous vein grafts, 51 homogenous frozen vein grafts, 109 polytetrafluoroethylene (ptfe) grafts, 209 emergency external arteriovenous shunts, three ...

We report the case of a 66-year-old man with a left anterior descending (LAD) coronary artery aneurysm. Cigarette smoking and hepatitis C virus infection were in his clinical history. Coronary angiography performed in 2002 showed a LAD aneurysm, a 50% stenosis of the right coronary artery, and a 30% stenosis of the left main artery (Figure 1, a through c). The ECG in 2002 was normal (Figure 2bi...

Theoretical analysis and Computer simulations have proven to be cost-effective and powerful tools in scientific studies of materials, particularly at nano-scale where synthesis of nano-structures, interpretation of their observed character and exploration of new structures are not always straight forward. We present here fundamental principles of techniques used today for computational simulati...

Abstract In this research, the novel materials based on polyamide (PA), polytetrafluoroethylene (PTFE), and olefinic oil molecules are produced as a solid lubricant in metal‐plastic sliding contacts or sacrificial elements metal–metal contacts. For these applications, high durability of compound material combined with low wear is required for long‐term use under friction mechanical loads. Earli...

Die Entwicklung hocheffizienter und selektiver Elektrokatalysatoren für die CO2-Reduktionsreaktion zur Herstellung von Chemikalien mit hohem Mehrwert wird intensiv untersucht. Wir berichten über eine Reihe CuxOyCz nanostrukturierten Elektrokatalysatoren, einem MOF auf Cu-Basis als poröses selbstopferndes Templat abgeleitet sind. Mischung der Katalysatoren Polytetrafluorethylen (PTFE) Gasdiffusi...

Thin polytetrafluoroethylene (PTFE) films are produced by deposition from a gas phase two methods: electron-enhanced vacuum (EVD) and EVD + low-temperature plasma (LTP). Structure, morphology, composition of the studied IR spectroscopy, atomic force microscopy, X-ray photoelectron spectroscopy. They close to structure bulk PTFE. The roughness films’ surface is changed with pressure LTP power va...