13,335 research outputs found
Clinical judgement, expertise and skilled coping
Medicine involves specific practical expertise as well as more general context-independent medical knowledge. This raises the question, what is the nature of the expertise involved? Is there a model of clinical judgement or understanding that can accommodate both elements? This paper begins with a summary of a published account of the kinds of situation-specific skill found in anaesthesia. It authors claim that such skills are often neglected because of a prejudice in favour of the ‘technical rationality’ exemplified in evidence-based medicine but they do not themselves offer a general account of the relation
of practical expertise and general medical knowledge. The philosopher Hubert Dreyfus provides one model of the relation of general knowledge to situation-specific skilled
coping. He claims that the former logically depends on the latter and provides two arguments, which I articulate in the second section, for this. But he mars those arguments by
building in the further assumption that such situation-specific responses must be understood as concept-free and thus mindless. That assumption is held in place by three arguments all of which I criticize in the next section to give a unified account of clinical judgement as both practical and conceptually structured and thus justified in the face of a prejudice in favour of ‘technical rationality’
A density theorem for parameterized differential Galois theory
We study parameterized linear differential equations with coefficients
depending meromorphically upon the parameters. As a main result, analogously to
the unparameterized density theorem of Ramis, we show that the parameterized
monodromy, the parameterized exponential torus and the parameterized Stokes
operators are topological generators in Kolchin topology, for the parameterized
differential Galois group introduced by Cassidy and Singer. We prove an
analogous result for the global parameterized differential Galois group, which
generalizes a result by Mitschi and Singer. These authors give also a necessary
condition on a group for being a global parameterized differential Galois
group; as a corollary of the density theorem, we prove that their condition is
also sufficient. As an application, we give a characterization of completely
integrable equations, and we give a partial answer to a question of Sibuya
about the transcendence properties of a given Stokes matrix. Moreover, using a
parameterized Hukuhara-Turrittin theorem, we show that the Galois group
descends to a smaller field, whose field of constants is not differentially
closed.Comment: To appear in Pacific Journal of Mathematic
Real difference Galois theory
In this paper, we develop a difference Galois theory in the setting of real
fields. After proving the existence and uniqueness of the real Picard-Vessiot
extension, we define the real difference Galois group and prove a Galois
correspondence.Comment: Final versio
Confluence of meromorphic solutions of q-difference equations
In this paper, we consider a q-analogue of the Borel-Laplace summation where
q>1 is a real parameter. In particular, we show that the Borel-Laplace
summation of a divergent power series solution of a linear differential
equation can be uniformly approximated on a convenient sector, by a meromorphic
solution of a corresponding family of linear q-difference equations. We perform
the computations for the basic hypergeometric series. Following J. Sauloy, we
prove how a fundamental set of solutions of a linear differential equation can
be uniformly approximated on a convenient domain by a fundamental set of
solutions of a corresponding family of linear q-difference equations. This
leads us to the approximations of Stokes matrices and monodromy matrices of the
linear differential equation by matrices with entries that are invariants by
the multiplication by q
Wedge immersed thermistor bolometers
An immersed thermistor bolometer for the detection of ultraviolet, visible, and infrared radiation is described. Two types of immersed bolometers are discussed. The immersion of thermistor flakes in a lens, or half immersed by optical contact on a lens, is examined. Lens materials are evaluated for optimum immersion including fused aluminum oxide, beryllium oxide, and germanium. The application of the bolometer to instruments in which the entrance pupil of the immersion optics has a high aspect ratio is considered
Splendid and perverse equivalences
Inspired by the works of Rickard on splendid equivalences and of Chuang and
Rouquier on perverse equivalences, we are here interested in the combination of
both, a splendid perverse equivalence. This is naturally the right framework to
understand the relations between global and local perverse equivalences between
blocks of finite groups, as a splendid equivalence induces local derived
equivalences via the Brauer functor. We prove that under certain conditions, we
have an equivalence between a perverse equivalence between the homotopy
category of p-permutation modules and local derived perverse equivalences, in
the case of abelian defect group.Comment: 13 pages, 4 figure
Wedge immersed thermistor bolometer measures infrared radiation
Wedge immersed-thermistor bolometer measures infrared radiation in the atmosphere. The thermistor flakes are immersed by optical contact on a wedge-shaped germanium lens whose narrow dimension is clamped between two complementary wedge-shaped germanium blocks bonded with a suitable adhesive
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