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We have to do this and that? You must be joking: Constructing and responding to paradox through humour
This paper adopts a practice approach to paradox, examining the role of micro-practices in shaping constructions of and responses to paradox. Our approach is inductively motivated. During an ethnographic study of an organization implementing paradoxical goals we noticed a strong incidence of humor, joking and laughter. Examining this practice closely, we realized that humor was used to surface, bring attention to, and make communicable experience of paradox in the moment by drawing out some specific contradiction in their work. Humor thus allowed actors to socially construct paradox, as well as - in interaction with others â construct potential responses to the multiple small incidences of paradox in their everyday work. In doing so, humor cast the interactional dynamics that were integral in constructing two response paths: (i) âentrenching a responseâ, whereby an existing response was affirmed, thereby continuing on a particular response path, and (ii) âshifting a responseâ, whereby actors moved from one response to paradox to another, thereby altering how the team collectively responded to paradoxical issues. Drawing on these findings, we reconceptualize paradox as a characteristic of everyday life, which is constructed and responded to in the moment
The impact of COVID-19 on the practice of Oral and Maxillofacial Pathology in the United States and Canada
Background: The COVID-19 pandemic has significantly disrupted the delivery of healthcare, including oral healthcare services. The restrictions imposed for mitigating spread of the virus forced dental practitioners to adopt significant changes in their workflow pattern. The aim of this study was to investigate the impact of the pandemic on the practice of oral and maxillofacial pathology in two countries in regard to educational activities, and clinical and diagnostic pathology services
Some remarks on the isoperimetric problem for the higher eigenvalues of the Robin and Wentzell Laplacians
We consider the problem of minimising the th eigenvalue, , of
the (-)Laplacian with Robin boundary conditions with respect to all domains
in of given volume . When , we prove that the second
eigenvalue of the -Laplacian is minimised by the domain consisting of the
disjoint union of two balls of equal volume, and that this is the unique domain
with this property. For and , we prove that in many cases a
minimiser cannot be independent of the value of the constant in the
boundary condition, or equivalently of the volume . We obtain similar
results for the Laplacian with generalised Wentzell boundary conditions .Comment: 16 page
The Force Balance of Electrons During Kinetic Anti-parallel Magnetic Reconnection
Fully kinetic simulations are applied to the study of 2D anti-parallel
reconnection, elucidating the dynamics by which the electron fluid maintains
force balance within both the electron diffusion region (EDR) and the ion
diffusion region (IDR). Inside the IDR, magnetic field-aligned electron
pressure anisotropy ( develops upstream of the
EDR. Compared to previous investigations, the use of modern computer facilities
allows for simulations at the natural proton to electron mass ratio
. In this high--limit the electron dynamics changes
qualitatively, as the electron inflow to the EDR is enhanced and mainly driven
by the anisotropic pressure. Using a coordinate system with the -direction
aligned with the reconnecting magnetic field and the -direction aligned with
the central current layer, it is well-known that for the much studied 2D
laminar anti-parallel and symmetric scenario the reconnection electric field at
the -line must be balanced by the and
off-diagonal electron pressure stress
components. We find that the electron anisotropy upstream of the EDR imposes
large values of within the EDR, and along the
direction of the reconnection -line this stress cancels with the stress of a
previously determined theoretical form for . The
electron frozen-in law is instead broken by pressure tensor gradients related
to the direct heating of the electrons by the reconnection electric field. The
reconnection rate is free to adjust to the value imposed externally by the
plasma dynamics at larger scales.Comment: Submitted to Physics of Plasmas, 11 October 202
Exposing errors related to weak memory in GPU applications
© 2016 ACM.We present the systematic design of a testing environment that uses stressing and fuzzing to reveal errors in GPU applications that arise due to weak memory effects. We evaluate our approach on seven GPUS spanning three NVIDIA architectures, across ten CUDA applications that use fine-grained concurrency. Our results show that applications that rarely or never exhibit errors related to weak memory when executed natively can readily exhibit these errors when executed in our testing environment. Our testing environment also provides a means to help identify the root causes of such errors, and automatically suggests how to insert fences that harden an application against weak memory bugs. To understand the cost of GPU fences, we benchmark applications with fences provided by the hardening strategy as well as a more conservative, sound fencing strategy
Singularities and Topology of Meromorphic Functions
We present several aspects of the "topology of meromorphic functions", which
we conceive as a general theory which includes the topology of holomorphic
functions, the topology of pencils on quasi-projective spaces and the topology
of polynomial functions.Comment: 21 pages, 1 figur
Cervical artery dissection: An atypical presentation with Ehlers-Danlos-like collagen pathology?
The authors took skin biopsies of the macroscopically normal skin of seven consecutive patients with spontaneous cervical artery dissection (SCAD). Histologically, alterations of the collagen and elastic fiber networks were found in six patients. In five, the histologic, immunohistochemical, and ultrastructural changes were similar to those usually found in Ehlers-Danlos syndrome (EDS). This suggests that SCAD is frequently associated with the dermal alterations seen in EDS
Polar Cremona Transformations and Monodromy of Polynomials
Consider the gradient map associated to any non-constant homogeneous
polynomial f\in \C[x_0,...,x_n] of degree , defined by \phi_f=grad(f):
D(f)\to \CP^n, (x_0:...:x_n)\to (f_0(x):...:f_n(x)) where D(f)=\{x\in \CP^n;
f(x)\neq 0\} is the principal open set associated to and
. This map corresponds to polar Cremona
transformations. In Proposition \ref{p1} we give a new lower bound for the
degree of under the assumption that the projective hypersurface
has only isolated singularities. When , Theorem \ref{t4}
yields very strong conditions on the singularities of .Comment: 8 page
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