14,703 research outputs found
Degradation of road tested automotive connectors
The automotive environment is particularly demanding on connector performance, and is characterized by large temperature changes, high humidity and corrosive atmospheres. This paper presents an initial study of connector performance in terms of temperature profiles taken from road vehicles. The temperature profiles are then simulated using empirical relationships to allow prediction of connector performance. Wire harnesses have been investigated to seek evidence of the connector degradation predicted from the temperature data. Initial indications are that the wire harness shows the type of fretting behavior associated with the temperature changes. Evidence of fretting corrosion was found at the contact interface on tin plated terminals from sealed and unsealed connectors
Phase behaviour of attractive and repulsive ramp fluids: integral equation and computer simulation studies
Using computer simulations and a thermodynamically self consistent integral
equation we investigate the phase behaviour and thermodynamic anomalies of a
fluid composed of spherical particles interacting via a two-scale ramp
potential (a hard core plus a repulsive and an attractive ramp) and the
corresponding purely repulsive model. Both simulation and integral equation
results predict a liquid-liquid de-mixing when attractive forces are present,
in addition to a gas-liquid transition. Furthermore, a fluid-solid transition
emerges in the neighbourhood of the liquid-liquid transition region, leading to
a phase diagram with a somewhat complicated topology. This solidification at
moderate densities is also present in the repulsive ramp fluid, thus preventing
fluid-fluid separation.Comment: 29 pages, 10 figure
Duties of Members, Directors, and Managers of Cooperative Associations
Exact date of bulletin unknown.PDF pages: 1
Fractional transformations of generalised functions
A distributional theory of fractional transformations is developed. A constructive approach, based on the eigenfunction expansion method pioneered by A. H. Zemanian, is used to produce an appropriate space of test functions and corresponding space of generalised functions. The fractional transformations that are defined are shown to form an equicontinuous group of operators on the space of test functions and a weak continuous group on the space of generalised functions. Integral representations for the fractional transformations are also obtained under certain conditions. The fractional Fourier transformation is considered as a particular case of our general theory
Some properties of the dissipative model of strain-gradient plasticity
A theoretical and computational investigation is carried out of a dissipative
model of rate-independent strain-gradient plasticity and its regularization. It
is shown that the flow relation, when expressed in terms of the Cauchy stress,
is necessarily global. The most convenient approach to formulating the flow
relation is through the use of a dissipation function. It is shown, however,
that the task of obtaining the dual version, in the form of a normality
relation, is a complex one. A numerical investigation casts further light on
the response using the dissipative theory in situations of non-proportional
loading. The elastic gap, a feature reported in recent investigations, is
observed in situations in which passivation has been imposed. It is shown
computationally that the gap may be regarded as an efficient path between a
load-deformation response corresponding to micro-free boundary conditions, and
that corresponding to micro-hard boundary conditions, in which plastic strains
are set equal to zero.Comment: 26 pages, 10 figure
The Environment as an Argument
Context-awareness as defined in the setting of Ubiquitous Computing [3] is all about expressing the dependency of a specific computation upon some implicit piece of information. The manipulation and expression of such dependencies may thus be neatly encapsulated in a language where computations are first-class values. Perhaps surprisingly however, context-aware programming has not been explored in a functional setting, where first-class computations and higher-order functions are commonplace. In this paper we present an embedded domain-specific language (EDSL) for constructing context-aware applications in the functional programming language Haskell. © 2012 Springer-Verlag
Social Bonding/Integration and Alcohol Use in the Chinese Union of Seventh-day Adventists
The relationship between alcohol use and social bonding with the Seventh-day Adventist Church in China was examined. There was inverse relationship between alcohol and commitment to, involvement with and belief in the Adventist Church in China. These findings indicate that social bonding theory may be useful in non-western cultures. [email protected]
Parsec-scale magnetic fields in Arp 220
We present the first very-long-baseline interferometry (VLBI) detections of
Zeeman splitting in another galaxy. We used Arecibo Observatory, the Green Bank
Telescope, and the Very Long Baseline Array to perform dual-polarization
observations of OH maser lines in the merging galaxy Arp 220. We measured
magnetic fields of 1-5 mG associated with three roughly parsec-sized
clouds in the nuclear regions of Arp 220. Our measured magnetic fields have
comparable strengths and the same direction as features at the same velocity
identified in previous Zeeman observations with Arecibo alone. The agreement
between single dish and VLBI results provides critical validation of previous
Zeeman splitting observations of OH megamasers that used a single large dish.
The measured magnetic field strengths indicate that magnetic energy densities
are comparable to gravitational energy in OH maser clouds. We also compare our
total intensity results to previously published VLBI observations of OH
megamasers in Arp 220. We find evidence for changes in both structure and
amplitude of the OH maser lines that are most easily explained by variability
intrinsic to the masing region, rather than variability produced by
interstellar scintillation. Our results demonstrate the potential for using
high-sensitivity VLBI to study magnetic fields on small spatial scales in
extragalactic systems.Comment: 9 pages, accepted to MNRA
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