Infrared absorption spectroscopy was used to investigate the chlorination of hydrogen-terminated Si 111 surfaces by three different methods: a exposure to a saturated solution of phosphorus pentachloride PCl5 in chlorobenzene; b exposure to chlorine gas, Cl2 g , and c exposure to Cl2 g under UV illumination. X-ray photoelectron spectroscopy and first principles model clusters calculations were ...

The paper presents ways to reduce the vibrations of special cantilever boring bars mounted on spindle heads finishing and machines. Special are designed for machining holes in non-standard conditions, example, when deep with l/d>3 (l–hole length, d-hole diameter) or a discontinuous surface. results experiments theoretical developments, as well schemes experimental stands, presented. investig...

This paper presents the design of a computer-controlled pin-on-disk tribometer for friction characterization of various friction sliding pairs. The tribometer setup comprises two high-bandwidth servomotors for the control of the rotating disk and the normal load-related spindle drive, as well as a high-precision tri-axial piezoelectric force sensor for normal and tangential forces measurement. ...

Two techniques have been used to analyse the densification of a silica sand by horizontal sinusoidal vibrations of frequency f=50Hz for relative accelerations between 0 and 6: the quantitative analysis of motion observed through the transparent wall, and the altitude map of the free top surface of the sample. The first technique was used to analyse the transient regime: during the first 10 seco...

Human body surface vibrations induced by high-level low-frequency pure tones were measured at the chest and the abdomen. At the same time, the subject rated the unpleasantness that he had just perceived during the exposure to low-frequency noise stimulus. Examining the relationship between the measured vibration and the rating score of the unpleasantness revealed that the unpleasantness was in ...

This paper presents the use of three-dimensional finite elements coupled with infinite elements to investigate the ground vibrations at the surface in terms of the peak particle velocity (PPV) due to construction of the first bore of the Dublin Port Tunnel. This situation is analysed using a commercially available general-purpose finite element package ABAQUS. A series of parametric studies is ...

A combined He-atom scattering and theoretical study of the low energy vibrations of physisorbed monolayers of Xe on Cu(111) and Cu(001) Abstract The surface phonon dispersion curves of commensurate Xe monolayers on Cu(111) and incommensurate Xe monolayers on Cu(001) surfaces have been measured using He atom scattering (HAS) time of flight (TOF) spectroscopy. The TOF spectra are interpreted by c...