29,263 research outputs found
Creating a Healthy Workplace Culture Using an Appreciative Inquiry 4-D Cycle
This study describes the second year of an ongoing partnership between an urban drug court (UDC) and a research university with very high research activity. The purpose of the second year of our study was to engage an appreciative inquiry (AI) Learning Team in all stages of the AI 4-D Cycle to discover the positive core of their work history and work relationships to create a healthy UDC workplace culture. Nine purposively selected participants were engaged in all four stages of the AI 4-D Cycle. There were four findings. Participants (a) developed a strong sense of personal and collective empowerment; (b) created a compelling vision for healthy workplace culture; (c) created a blueprint to achieve their vision of a healthy workplace culture; and (d) generated important action steps to implement a healthy workplace culture. The application to practice of using an AI 4-D Cycle provides managers in both private and public organizations with strategies to create healthy workplace cultures
Evidence for charm-bottom tetraquarks and the mass dependence of heavy-light tetraquark states from lattice QCD
We continue our study of heavy-light four-quark states and find evidence from
lattice QCD for the existence of a strong-interaction-stable
tetraquark with mass in the range of 15 to 61 MeV below
threshold. Since this range includes the electromagnetic
decay threshold, current uncertainties do not allow us to
determine whether such a state would decay electromagnetically, or only weakly.
We also perform a study at fixed pion mass, with NRQCD for the heavy quarks,
simulating and tetraquarks with or
and variable, unphysical in order to investigate the heavy
mass-dependence of such tetraquark states. We find that the dependence of the
binding energy follows a phenomenologically-expected form and that, though
NRQCD breaks down before is reached, the results at higher
clearly identify the channel as the
most likely to support a strong-interaction-stable tetraquark state at
. This observation serves to motivate the direct
simulation. Throughout we use dynamical ensembles
with pion masses 415, 299, and 164 MeV reaching down almost to the
physical point, a relativistic heavy quark prescription for the charm quark,
and NRQCD for the bottom quark(s).Comment: 24 pages, 4 figure
Noiseless nonreciprocity in a parametric active device
Nonreciprocal devices such as circulators and isolators belong to an
important class of microwave components employed in applications like the
measurement of mesoscopic circuits at cryogenic temperatures. The measurement
protocols usually involve an amplification chain which relies on circulators to
separate input and output channels and to suppress backaction from different
stages on the sample under test. In these devices the usual reciprocal symmetry
of circuits is broken by the phenomenon of Faraday rotation based on magnetic
materials and fields. However, magnets are averse to on-chip integration, and
magnetic fields are deleterious to delicate superconducting devices. Here we
present a new proposal combining two stages of parametric modulation emulating
the action of a circulator. It is devoid of magnetic components and suitable
for on-chip integration. As the design is free of any dissipative elements and
based on reversible operation, the device operates noiselessly, giving it an
important advantage over other nonreciprocal active devices for quantum
information processing applications.Comment: 17 pages, 4 figures + 12 pages Supplementary Informatio
More on heavy tetraquarks in lattice QCD at almost physical pion mass
We report on our progress in studying exotic, heavy tetraquark states,
. Using publicly available dynamical
Wilson-Clover gauge configurations, generated by the PACS-CS collaboration,
with pion masses 164, 299 and 415 MeV, we extend our previous analysis
to heavy quark components containing heavier than physical bottom quarks or , charm and bottom quarks and also only charm quarks
. Throughout we employ NRQCD and relativistic heavy quarks for
the heavier than bottom, bottom and charm quarks. Using our previously
established diquark-antidiquark and meson-meson operator basis we comment in
particular on the dependence of the binding energy on the mass of the heavy
quark component , with heavy quarks ranging from . In the heavy flavor non-degenerate case, ,
and especially for the tetraquark channel , we extend our work
to utilize a GEVP to study the ground and threshold states thereby
enabling a clear identification of possible binding. Finally, we present
initial work on the system where a much
larger operator basis is available in comparison to flavor combinations with
NRQCD quarks.Comment: 8 pages, 5 figures, proceedings contribution to "Lattice 2017. 35th
International Symposium on Lattice Field Theory", 18th-24th June 2017,
Granada, Spai
Towards a Generic Trace for Rule Based Constraint Reasoning
CHR is a very versatile programming language that allows programmers to
declaratively specify constraint solvers. An important part of the development
of such solvers is in their testing and debugging phases. Current CHR
implementations support those phases by offering tracing facilities with
limited information. In this report, we propose a new trace for CHR which
contains enough information to analyze any aspects of \CHRv\ execution at some
useful abstract level, common to several implementations. %a large family of
rule based solvers. This approach is based on the idea of generic trace. Such a
trace is formally defined as an extension of the semantics of
CHR. We show that it can be derived form the SWI Prolog CHR trace
Applying Quantum Principles to Psychology
This article starts out with a detailed example illustrating the utility of
applying quantum probability to psychology. Then it describes several
alternative mathematical methods for mapping fundamental quantum concepts (such
as state preparation, measurement, state evolution) to fundamental
psychological concepts (such as stimulus, response, information processing).
For state preparation, we consider both pure states and densities with
mixtures. For measurement, we consider projective measurements and positive
operator valued measurements. The advantages and disadvantages of each method
with respect to applications in psychology are discussed.Comment: one of the aims of this review paper is to attract attention of
experts in quantum information and probability (as well as in quantum
foundations) to a new rapidly growing field of applications of quantum
theory. The paper establishes the correspondence between concepts of quantum
theory and concepts of cognitive science and psychology. Submitted to Physica
Script
Patterns driven by combined AC and DC electric fields in nematic liquid crystals
The effect of superimposed ac and dc electric fields on the formation of
electroconvection and flexoelectric patterns in nematic liquid crystals was
studied. For selected ac frequencies an extended standard model of the
electro-hydrodynamic instabilities was used to characterize the onset of
pattern formation in the two-dimensional parameter space of the magnitudes of
the ac and dc electric field components. Numerical as well as approximate
analytical calculations demonstrate that depending on the type of patterns and
on the ac frequency, the combined action of ac and dc fields may either enhance
or suppress the formation of patterns. The theoretical predictions are
qualitatively confirmed by experiments in most cases. Some discrepancies,
however, seem to indicate the need to extend the theoretical description
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