Rolling bearings are considered to be rigid supports of a pinned nature. In fact, rolling develop displacements that depend on the external load and stiffness shaft which they supported. addition, tapered roller use preloading, has an additional effect in bearings. these affect internal deformations thus actual bearing. This paper presents methodology for determining loads bearings, taking into...

OBJECTIVE To determine the number of fatalities related to roller coasters and examine factors common to multiple incidents. METHODS A case was defined as the death of a person, which was associated with a roller coaster in the United States between 15 May 1994 and 14 May 2004. Cases were identified from four DATA SOURCES (1) Consumer Product Safety Commission, (2) Lexis-Nexis, (3) Medline,...

The polymer solar cells were fabricated by a novel solution coating process, the roller painting. The roller painted film composed of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) has smoother surface than the spin coated film. Since the roller painting is accompanied with shear and normal stresses and is also a s low drying process, the process induces eff...

FOR some years we have been engaged on the problem of extracting enzymes from micro-organisms. It is well known that most bacteria and yeasts carry out oxidations and metabolic processes at a rate incomparably higher than that of animal tissues. The peculiar virtue of micro-organisms as the source of enzymes is therefore self-evident. A certain amount of success has been attained in extracting ...

The first roller pump was patented in 1855 by Porter and Bradley and was hand operated. A modification first named "surgical pump", designed and manufactured by E. E. Allen in 1887, was intended for direct blood transfusion. Truax, who also distributed and promoted the Allen pump with one roller, developed the first double roller pump in 1899. In the following decades, several researchers, incl...

A novel intelligent fault diagnosis method for motor roller bearings which operate under unsteady rotating speed and load is proposed in this paper. The pseudo Wigner-Ville distribution (PWVD) and the relative crossing information (RCI) methods are used for extracting the feature spectra from the non-stationary vibration signal measured for condition diagnosis. The RCI is used to automatically ...

Abstract. Roller bearing failures in wind turbines' gearboxes lead to long downtimes and high repair costs, which could be reduced by the implementation of a predictive maintenance strategy. In this paper within context, an acoustic-emission-based condition monitoring system is applied roller test rigs with aim identifying critical operating conditions before occurs. Furthermore, comparison reg...

In an estuary, a tidal bore may be generated at the leading edge of the flood tidal wave during the early flood tide under spring tide conditions into a narrow funnelled channel. For Froude numbers greater than 1.4–1.6, the leading edge of the bore is characterised by a breaking roller. The roller is characterised by a sudden increase in water depth, a highly turbulent flow with large-scale vor...

The binary ink developer in the HP-Indigo press selectively applies condensed ElectroInk® onto the photoreceptor to form the image. The ink is transported by the elastomeric developer roller, which needs to be sufficiently conductive to allow its surface voltage remains constant as it moves through the various interfaces encountered along its periphery. But it cannot be so conductive as to disc...