1,370 research outputs found
The Effect of Personal Portable Alarms on Clinical Staff’s Perception of Safety at an Adult Psychiatric Hospital Unit
The aim of this evidence-based project was to introduce portable personal alarms to all clinical staff on an acute adult psychiatric locked unit at the Mesa Vista Behavioral Health Hospital, San Diego. The purpose was to increase staff’s perceived and actual safety. The project resulted in an increase of staff’s perception of safety in areas such patient safety as perceived by staff, improved perception of addressing medical errors, and improved perception of learning culture at the facility. While 80% of responding staff found the concept of portable personal alarms beneficial, most agreed alternative models of alarms should be investigated, due to high sensitivity of introduced alarms. The results demonstrate significance of early detection of high risk situations in relation to safety attitudes and identified additional areas of staff’s safety concerns
Toxic pollutants, health indices and population dynamics of Harbor Seals in San Francisco Bay, 1989-1992
(PDF contains 300 pages
Effective pairing interaction in the two-dimensional Hubbard model within a spin rotationally invariant approach
We implement the rotationally-invariant formulation of the two-dimensional
Hubbard model, with nearest-neighbors hopping , which allows for the
analytical study of the system in the low-energy limit. Both U(1) and SU(2)
gauge transformations are used to factorize the charge and spin contributions
to the original electron operator in terms of the corresponding gauge fields.
The Hubbard Coulomb energy term is then expressed in terms of quantum phase
variables conjugate to the local charge and variable spin-quantization axis,
providing a useful representation of strongly correlated systems. It is shown
that these gauge fields play a similar role as phonons in the BCS theory: they
act as the "glue" for fermion pairing. By tracing out gauge degrees of freedom,
the form of paired states is established and the strength of the pairing
potential is determined. It is found that the attractive pairing potential in
the effective low-energy fermionic action is non-zero in a rather narrow range
of .Comment: 12 pages, 1 figur
Assessing Human Error Against a Benchmark of Perfection
An increasing number of domains are providing us with detailed trace data on
human decisions in settings where we can evaluate the quality of these
decisions via an algorithm. Motivated by this development, an emerging line of
work has begun to consider whether we can characterize and predict the kinds of
decisions where people are likely to make errors.
To investigate what a general framework for human error prediction might look
like, we focus on a model system with a rich history in the behavioral
sciences: the decisions made by chess players as they select moves in a game.
We carry out our analysis at a large scale, employing datasets with several
million recorded games, and using chess tablebases to acquire a form of ground
truth for a subset of chess positions that have been completely solved by
computers but remain challenging even for the best players in the world.
We organize our analysis around three categories of features that we argue
are present in most settings where the analysis of human error is applicable:
the skill of the decision-maker, the time available to make the decision, and
the inherent difficulty of the decision. We identify rich structure in all
three of these categories of features, and find strong evidence that in our
domain, features describing the inherent difficulty of an instance are
significantly more powerful than features based on skill or time.Comment: KDD 2016; 10 page
The conduction pathway of potassium channels is water free under physiological conditions.
Ion conduction through potassium channels is a fundamental process of life. On the basis of crystallographic data, it was originally proposed that potassium ions and water molecules are transported through the selectivity filter in an alternating arrangement, suggesting a "water-mediated" knock-on mechanism. Later on, this view was challenged by results from molecular dynamics simulations that revealed a "direct" knock-on mechanism where ions are in direct contact. Using solid-state nuclear magnetic resonance techniques tailored to characterize the interaction between water molecules and the ion channel, we show here that the selectivity filter of a potassium channel is free of water under physiological conditions. Our results are fully consistent with the direct knock-on mechanism of ion conduction but contradict the previously proposed water-mediated knock-on mechanism
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