نتایج جستجو برای: polytetrafluoroethylene
تعداد نتایج: 2980 فیلتر نتایج به سال:
In this work, the plane-on-plane torsional fretting tribological behavior of polytetrafluoroethylene (PTFE) was studied. A model of a rigid, flat-ended punch acting on an elastic half-space was built according to the experimental conditions. The results indicate that the shape of T-θ curves was influenced by both the torsional angle and the normal load. The torsion friction torque and wear rate...
The standard ultraviolet through short-wave infrared (200-2500-nm) diffuse-reflectance material, Halon PTFE, type G-80, is no longer available. Therefore an equivalent diffuse-reflectance standard material must be found. Algoflon F6 is shown here to be an appropriate replacement through the presentation of measurements of various spectral-reflectance properties of Halon and Algoflon F6. The mea...
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Social and spatial heterogeneity in psychosis proneness in a multilevel case-prodrome-control study.
OBJECTIVE To test whether spatial and social neighbourhood patterning of people at ultra-high risk (UHR) of psychosis differs from first-episode psychosis (FEP) participants or controls and to determine whether exposure to different social environments is evident before disorder onset. METHOD We tested differences in the spatial distributions of representative samples of FEP, UHR and control ...
Aetna considers endoscopic injection of dextranomer/hyaluronic acid copolymer (Deflux), polydimethylsiloxane (Macroplastique), polytetrafluoroethylene (Teflon), or other bulking agents approved by the U.S. Food and Drug Administration (FDA) for vesicoureteral reflux (VUR) medically necessary for the treatment of members with primary or secondary VUR who have any of the following conditions when...
The paper deals with the study of processes obtaining polymer composites by chemo-mechanical activation technology (CMA-technology). methods research and testing composite materials based on polytetrafluoroethylene (PTFE) carbon fibers are analyzed generalized. influence CMA structure properties PTFE was determined.
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