857 research outputs found
Management of a Parturient with Mast Cell Activation Syndrome: An Anesthesiologist\u27s Experience
Mast cell activation syndrome (MCAS) is a disorder in which patients experience symptoms and signs attributable to inappropriate mast cell activation and mediator release. Multiorgan involvement in patients can result in significant morbidity and possible mortality. Limited literature exists regarding anesthetic management of patients with MCAS. We report a case of vaginal delivery with neuraxial labor analgesia in a parturient with this condition and highlight the importance of multidisciplinary planning for uneventful outcomes. Stress can trigger life-threatening symptoms, and counseling is important to allay patients\u27 fears. Optimum medical control, adequate premedication, avoidance of triggers, and preparedness to treat serious mediator effects are key. We review MCAS and discuss anesthetic considerations for patients with this mast cell disorder
The universal cover of an algebra without double bypass
Let A be a basic finite dimensional and connected algebra over an
algebraically closed field k with zero characteristic. If the ordinary quiver
of A has no double bypasses, we show that A admits a Galois covering which
satisfies a universal property with respect to the Galois coverings of A. This
universal property is similar to the one of the universal cover of a connected
topological space.Comment: This text (21 pages) gives detailed proofs of the results announced
in a previous note of the author (The fundamental group of a triangular
algebra without double bypasses) and extends the study of this previous note
to the Galois coverings of an algebr
NUMERICAL MULTIGROUP TRANSIENT ANALYSIS OF SLAB NUCLEAR REACTOR WITH THERMAL FEEDBACK
The paper describes a new numerical code for multigroup transient analyses with thermal feedback. The code is developed at Institute of Nuclear and Physical Engineering. It is necessary to carefully investigate transient states of fast neutron reactors, due to recriticality issues after accident scenarios. The code solves numerical diffusion equation for 1D problem with possible neutron source incorporation. Crank-Nicholson numerical method is used for the transient states. The investigated cases are describing behavior of PWR fuel assembly inside of spent fuel pool and with the incorporated neutron source for better illustration of thermal feedback
Maximal intrinsic randomness of a quantum state
One of the most counterintuitive aspects of quantum theory is its claim that
there is 'intrinsic' randomness in the physical world. Quantum information
science has greatly progressed in the study of intrinsic, or secret, quantum
randomness in the past decade. With much emphasis on device-independent and
semi-device-independent bounds, one of the most basic questions has escaped
attention: how much intrinsic randomness can be extracted from a given state
, and what measurements achieve this bound? We answer this question for
two different randomness quantifiers: the conditional min-entropy and the
conditional von Neumann entropy. For the former, we solve the min-max problem
of finding the measurement that minimises the maximal guessing probability of
an eavesdropper. The result is that one can guarantee an amount of conditional
min-entropy with
by
performing suitable projective measurements. For the latter, we find that its
maximal value is , with the von Neumann
entropy of . Optimal values for and are
achieved by measuring in any basis that is unbiased to the eigenbasis of
, as well as by other less intuitive measurements
An education and training programme for radiological institutes: impact on the reduction of the CT radiation dose
Objectives: To establish an education and training programme for the reduction of CT radiation doses and to assess this programme's efficacy. Methods: Ten radiological institutes were counselled. The optimisation programme included a small group workshop and a lecture on radiation dose reduction strategies. The radiation dose used for five CT protocols (paranasal sinuses, brain, chest, pulmonary angiography and abdomen) was assessed using the dose-length product (DLP) before and after the optimisation programme. The mean DLP values were compared with national diagnostic reference levels (DRLs). Results: The average reduction of the DLP after optimisation was 37% for the sinuses (180 vs. 113mGycm, P < 0.001), 9% for the brain (982 vs. 896mGycm, P < 0.05), 24% for the chest (425 vs. 322mGycm, P < 0.05) and 42% for the pulmonary arteries (352 vs. 203mGycm, P < 0.001). No significant change in DLP was found for abdominal CT. The post-optimisation DLP values of the sinuses, brain, chest, pulmonary arteries and abdomen were 68%, 10%, 20%, 55% and 15% below the DRL, respectively. Conclusions: The education and training programme for radiological institutes is effective in achieving a substantial reduction in CT radiation dos
Criticality Safety Analysis of Spent Fuel Storage Pool for NPP Mochovce using MCNP5 Code
The paper presents results of nuclear criticality safety analysis of spent fuel storage and
handling for the 1st and 2nd unit of NPP Mochovce. Spent fuel storage pool (compact and reserve
grid) and T-12 transport cask were modeled using the Monte Carlo code MCNP5. Conservative
approach was applied and calculation of max
eff k values was performed for normal and various
postulated emergency conditions in order to evaluate the final maximal max
eff k values. The
requirement of current safety regulations to ensure 5% subcriticality was met except some
especially conservative cases
The Intrinsic Fundamental Group of a Linear Category
We provide an intrinsic definition of the fundamental group of a linear
category over a ring as the automorphism group of the fibre functor on Galois
coverings. If the universal covering exists, we prove that this group is
isomorphic to the Galois group of the universal covering. The grading deduced
from a Galois covering enables us to describe the canonical monomorphism from
its automorphism group to the first Hochschild-Mitchell cohomology vector
space.Comment: Final version, to appear in Algebras and Representation Theor
Minerva Cuevas: Disidencia
Bilingual catalogue for the exhibition Minerva Cuevas: Disidencia presented at Baruch College\u27s Mishkin Gallery
A shadowing problem in the detection of overlapping communities: lifting the resolution limit through a cascading procedure
Community detection is the process of assigning nodes and links in
significant communities (e.g. clusters, function modules) and its development
has led to a better understanding of complex networks. When applied to sizable
networks, we argue that most detection algorithms correctly identify prominent
communities, but fail to do so across multiple scales. As a result, a
significant fraction of the network is left uncharted. We show that this
problem stems from larger or denser communities overshadowing smaller or
sparser ones, and that this effect accounts for most of the undetected
communities and unassigned links. We propose a generic cascading approach to
community detection that circumvents the problem. Using real and artificial
network datasets with three widely used community detection algorithms, we show
how a simple cascading procedure allows for the detection of the missing
communities. This work highlights a new detection limit of community structure,
and we hope that our approach can inspire better community detection
algorithms.Comment: 14 pages, 12 figures + supporting information (5 pages, 6 tables, 3
figures
Criticality Safety Analysis of Spent Fuel Storage Pool for NPP Mochovce using MCNP5 Code
The paper presents results of nuclear criticality safety analysis of spent fuel storage and
handling for the 1st and 2nd unit of NPP Mochovce. Spent fuel storage pool (compact and reserve
grid) and T-12 transport cask were modeled using the Monte Carlo code MCNP5. Conservative
approach was applied and calculation of max
eff k values was performed for normal and various
postulated emergency conditions in order to evaluate the final maximal max
eff k values. The
requirement of current safety regulations to ensure 5% subcriticality was met except some
especially conservative cases
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