12,511 research outputs found
Solenoid valve performance characteristics studied
Current and voltage waveforms of a solenoid coil are recorded as the valve opens and closes. Analysis of the waveforms with respect to time and the phase of the valve cycle accurately describes valve performance
Estimation of unsteady aerodynamic forces using pointwise velocity data
A novel method to estimate unsteady aerodynamic force coefficients from
pointwise velocity measurements is presented. The methodology is based on a
resolvent-based reduced-order model which requires the mean flow to obtain
physical flow structures and pointwise measurement to calibrate their
amplitudes. A computationally-affordable time-stepping methodology to obtain
resolvent modes in non-trivial flow domains is introduced and compared to
previous existing matrix-free and matrix-forming strategies. The technique is
applied to the unsteady flow around an inclined square cylinder at low Reynolds
number. The potential of the methodology is demonstrated through good agreement
between the fluctuating pressure distribution on the cylinder and the temporal
evolution of the unsteady lift and drag coefficients predicted by the model and
those computed by direct numerical simulation.Comment: In revie
Multi-k magnetic structures in USb_{0.9}Te_{0.1} and UAs_{0.8}Se_{0.2} observed via resonant x-ray scattering at the U M4 edge
Experiments with resonant photons at the U M4 edge have been performed on a
sample of USb_{0.9}Te_{0.1}, which has an incommensurate magnetic structure
with k = 0.596(2) reciprocal lattice units. The reflections of the form ,
as observed previously in a commensurate k = 1/2 system [N. Bernhoeft et al.,
Phys. Rev. B 69 174415 (2004)] are observed, removing any doubt that these
occur because of multiple scattering or high-order contamination of the
incident photon beam. They are clearly connected with the presence of a 3k
configuration. Measurements of the reflections from the sample
UAs_{0.8}Se_{0.2} in a magnetic field show that the transition at T* ~ 50 K is
between a low-temperature 2k and high-temperature 3k state and that this
transition is sensitive to an applied magnetic field. These experiments stress
the need for quantitative theory to explain the intensities of these
reflections.Comment: submitted to Phys. Rev.
Private languages and private theorists
Simon Blackburn objects that Wittgenstein's private language argument overlooks the possibility that a private linguist can equip himself with a criterion of correctness by confirming generalizations about the patterns in which his private sensations occur. Crispin Wright responds that appropriate generalizations would be too few to be interesting. But I show that Wright's calculations are upset by his failure to appreciate both the richness of the data and the range of theories that would be available to the private linguist
De Libero Conscientia: Martin Luther’s Rediscovery of Liberty of Conscience and its Synthesis of the Ancients and the Influence of the Moderns
One fateful day on March 26, 1521, a lowly Augustinian monk was cited to appear before the Diet of Worms.[1] His habit trailed behind him as he braced for the questioning. He was firm, yet troubled. He boldly proclaimed: “If I am not convinced by proofs from Scripture, or clear theological reasons, I remain convinced by the passages which I have quoted from Scripture, and my conscience is held captive by the Word of God. I cannot and will not retract, for it is neither prudent nor right to go against one’s conscience. So help me God, Amen! [italics mine]”[2] That man was Martin Luther.
Indeed, Martin Luther has stood the test of time as one of the most influential figures in Church history. His contributions and reforms remain an integral part of the Western world. Luther\u27s thoughts on the idea of liberty of conscience are a timely musing for the history of philosophy as well as a guide for public policy in matters of religious freedom today. This piece examines several primary sources such as Augustine\u27s On Free Choice of the Will, John Locke\u27s A Letter Concerning Toleration, and Martin Luther\u27s On Christian Liberty, as well as several noteworthy secondary sources like Roland Bainton\u27s Here I Stand - A Life of Martin Luther, Timothy Samuel Shah & Allen D. Hertzke\u27s Christianity and Freedom, Volume 1: Historical Perspectives, and John Jr. Witte\u27s The Reformation of Rights: Law, Religion, and Human Rights in Early Modern Calvinism.
[1] Hartmann Girsar, S.J. Martin Luther: His Life and Work. Adapted from the Second German Edition by Frank J. Eble, M.A. (Westminster, Maryland: The Newman Press, 1954), 181.
[2] Ibid., 185
Virtual EQ – the talent differentiator in 2020?
In an increasingly competitive, globalised world, knowledge-intensive industries/ services are seen as engines for success. Key to this marketplace is a growing army of ‘talent’ i.e. skilled and dedicated knowledge workers. These knowledge workers engage in non-routine problem solving through combining convergent, divergent and creative thinking across organizational and company boundaries - a process often facilitated though the internet and social media, consequently forming networks of expertise. For knowledge workers, sharing their learning with others through communities of practice embedded in new information media becomes an important element of their personal identity and the creation of their individual brand or e-social reputation. Part of the new knowledge/skills needed for this process becomes not only emotional intelligence (being attuned to the emotional needs of others) but being able to do this within and through new media, thus the emergence of virtual emotional intelligence (EQ). Our views of current research found that HRD practitioners in 2020 might need to consider Virtual EQ as part of their talent portfolio. However it seems that new technology has created strategies for capturing and managing knowledge that are readily duplicated and that a talent differentiator in 2020 might simply be the ability and willingness to learn
Techniques for targeted Fermi-GBM follow-up of gravitational-wave events
The Advanced LIGO and Advanced Virgo ground-based gravitational-wave
detectors are projected to come online 2015-2016, reaching a final sensitivity
sufficient to observe dozens of binary neutron star mergers per year by 2018.
We present a fully-automated, targeted search strategy for prompt gamma-ray
counterparts in offline Fermi-GBM data. The multi-detector method makes use of
a detailed model response of the instrument, and benefits from time and sky
location information derived from the gravitational-wave signal.Comment: 2012 Fermi Symposium proceedings - eConf C12102
A First Comparison of SLOPE and Other LIGO Burst Event Trigger Generators
A number of different methods have been proposed to identify unanticipated
burst sources of gravitational waves in data arising from LIGO and other
gravitational wave detectors. When confronted with such a wide variety of
methods one is moved to ask if they are all necessary, i.e. given detector data
that is assumed to have no gravitational wave signals present, do they
generally identify the same events with the same efficiency, or do they each
'see' different things in the detector? Here we consider three different
methods, which have been used within the LIGO Scientific Collaboration as part
of its search for unanticipated gravitational wave bursts. We find that each of
these three different methods developed for identifying candidate gravitational
wave burst sources are, in fact, attuned to significantly different features in
detector data, suggesting that they may provide largely independent lists of
candidate gravitational wave burst events.Comment: 10 Pages, 5 Figures, Presented at the 10th Gravitational Wave Data
Analysis Workshop (GWDAW-10), 14-17 December 2005 at the University of Texas,
Brownsvill
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