Reducing start and stop time without destroying the pavement surface is important in enhancing productivity of double-drum roller and compact quality of asphalt pavement, but it is difficult in confirming the maximum brake deceleration or start acceleration of double-drum roller. Dynamic analysis is used in studying these questions, and a mathematic model of double-drum roller is established, b...

The grinding process has become widely used to improve the fineness and performance of fly ash. However, most studies focus on particle size distribution ground ash, while morphology is also an important factor affect cement paste. This article aims at three different kinds ash from ball mill vertical mill, observed by scanning electron microscopy (SEM) calculate spherical destruction (the rati...

Aiming at predicting what happens in reality inside mills, the contact parameters of iron ore particles for discrete element method (DEM) simulations should be determined accurately. To allow the irregular shape to be accurately determined, the sphere clump method was employed in modelling the particle shape. The inter-particle contact parameters were systematically altered whilst the contact p...

Multiple visual signals are relevant to perception of heading direction. While the role of optic flow and depth cues has been studied extensively, little is known about the visual effects of gravity on heading perception. We used fMRI to investigate the contribution of gravity-related visual cues on the processing of vertical versus horizontal apparent self-motion. Participants experienced virt...

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...

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...

An antilock braking system (ABS) is one of the most important components in a road vehicle, which provides active protection during braking, to prevent wheels from locking-up and achieve handling stability steerability. The all-electric ABS without any hydraulic potential candidate for electric vehicles. To demonstrate examine algorithms, this article proposes single-wheel test bench, mainly in...

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...