108,844 research outputs found
Friction in a hydraulic motor piston/cam roller contact lined with PTFE impregnated
The aim of this work was to test a new PTFE impregnated cloth material for use as a surface layer on the pistons of a hydraulic motor at the interface with the cam roller. Tests were carried out using a standard Bowden & Leben sliding friction tester which indicated that the cloth material gave similar results to the current material (PTFE impregnated sintered bronze) in both dry and lubricated conditions. Actual component tests run on a modified twin disc test machine showed that the cloth performed better in conditions of reduced lubrication. Wear testing would be required to fully assess the feasibility of using the material in a hydraulic motor. (C) 2008 Elsevier B.V. All rights reserved
Coal pressurization and feeding: Use of a lock hopper system
Operation of a synthane gasifier pilot plant is discussed. The specific problems experienced with the operation of the Petrocarb system at the pilot plant are described along with modifications made to improve its performance
Wheel/Rail Contact Isolation Due to Track Contamination
An experimental study has been carried out to
investigate the effect of sanding on the electrical
isolation of a wheel/rail contact. Sand is applied to the
wheel/rail interface to increase adhesion in both braking
and traction. Train detection, for signalling purposes,
can be by means of track circuits. Signalling block
occupancy is triggered by the wheelset of the train
âshorting outâ the track circuit. Sand in the wheel/rail
interface means that contact between the wheelsets and
the track may be compromised, inhibiting train
identification.
Static tests were performed using sections cut
from wheels and rail and dynamic tests on a twin disc
machine where rail and wheel steel discs are loaded
together and driven under controlled conditions of
rolling and slip. The electrical circuit used was a
simplified simulation of the TI21 track circuit.
The application of sand was carried out under a
range of mild and severe test conditions. The results
indicated that a transition exists in the amount of sand
applied, below which there is a measurable, but not
severe, change in voltage, but above which the contact
conductance decreases by an order of magnitude. A
model of electrical isolation has been developed
assuming either full disc separation by a sand layer or
partial disc contact with some sand present.
Idealisations inherent in both test methods mean
that they represent a severe case. Given these
limitations, it is likely that the test methods, at their
present stage of development, should be used as a
means to qualitatively assess the relative effects on
electrical isolation of different contaminants
Selecting communication media for distributed communities
Within the 'Virtual Mobility and Distributed Laboratories' project three naturalistic case studies of distributed research communities were conducted with a focus on the communication media used. The findings provide insight into relationships between the different media that the communities selected, and the different activities to which these media contributed. It is suggested that these findings are also relevant for distributed groups in which collaborative learning is the primary aim. A framework is presented for understanding and recommending selections of media for particular kinds of tasks, which is derived by integrating Mediaârichness Theory and Activity Theory. This framework indicates how task/media fit may be achieved while taking into account the evolving character of activities in a distributed community. Some implications of the framework for collaborative distance learning are highlighted.\ud
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Strange-quark Current in the Nucleon from Lattice QCD
The contribution of the strange-quark current to the electromagnetic form
factors of the nucleon is studied using lattice QCD. The strange current matrix
elements from our lattice calculation are analyzed in two different ways, the
differential method used in an earlier work by Wilcox and a cumulative method
which sums over all current insertion times. The preliminary results of our
simulation indicate the importance of high statistics, and that consistent
results between the varying analysis methods can be achieved. Although this
simulation does not yet yield a number that can be compared to experiment,
several criteria useful in assessing the robustness of a signal extracted from
a noisy background are presented.Comment: 12 pages, 9 figures, Presented at EMI 200
Mapping rail wear transitions
This paper outlines work carried out to produce maps of
rail material wear coefficients taken from laboratory
tests run on twin disc and pin-on-disc machines as well
as those derived from measurements taken in the field.
Wear transitions are identified using the maps and
defined in terms of slip and contact pressure. Wear
regimes are related to expected wheel/rail contact
conditions and contact points (rail head/wheel tread and
rail gauge/wheel flange). Surface and sub-surface
morphologies are discussed and comparisons are made
between field and laboratory data
Viking and STP P78-2 electrostatic charging designs and testing
The design provisions of the Viking and the P78-2 (SCATHA) vehicles and a mathematical analysis of the effect of arcing on typical interface circuits are given. Results of verification testing of the analysis are presented as well as vehicle testing for tolerance to arcing
Design overview of fiber-reinforced superalloy composites for the Space Shuttle main engine
This preliminary design study evaluated the potential of fiber-reinforced superalloys (FRS) for hot-section components of Space Shuttle Main Engine turbopumps. Emphasis was placed on uncooled turbine blades, with a more limited evaluation of FRS turbine stator vanes. The study included FRS properties evaluation, current structural design capability, and preliminary design and structural analysis. In addition, key technology needs were identified, and a plan was generated to develop operational hardware for advanced versions of the SSME. Based on projections of design properties for FRS composites comprising 50 volume percent of W-4Re-0.38Hf-0.02C wire filaments in a ductile superalloy matrix, it was concluded that FRS turbine blades offer the potential of significant improved operating life and higher temperature capability over the MAR-M-246(Hf) (DS) blades currently used in the SSME
Isospin violation in the vector form factors of the nucleon
A quantitative understanding of isospin violation is an increasingly
important ingredient for the extraction of the nucleon's strange vector form
factors from experimental data. We calculate the isospin violating electric and
magnetic form factors in chiral perturbation theory to leading and
next-to-leading order respectively, and we extract the low-energy constants
from resonance saturation. Uncertainties are dominated largely by limitations
in the current knowledge of some vector meson couplings. The resulting bounds
on isospin violation are sufficiently precise to be of value to on-going
experimental studies of the strange form factors.Comment: 13 pages, 8 figures, uses RevTe
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