3,736 research outputs found
Neutrino mixing contribution to the cosmological constant
We show that the non-perturbative vacuum structure associated with neutrino
mixing leads to a non-zero contribution to the value of the cosmological
constant. Such a contribution comes from the specific nature of the mixing
phenomenon. Its origin is completely different from the one of the ordinary
contribution of a massive spinor field. We estimate this neutrino mixing
contribution by using the natural cut--off appearing in the quantum field
theory formalism for neutrino mixing and oscillation.Comment: 7 page
Current-driven excitations in magnetic multilayers: a brief review
In 1996, Berger and Slonczewski independently predicted that a large enough
spin-polarized dc current density sent perpendicularly through a ferromagnetic
layer could produce magnetic excitations (spin-waves) or reversal of
magnetization (switching). In the past few years, both current-driven switching
and current-driven excitation of spin-waves have been observed. The switching
is of potential technological interest for direct 'writing' of magnetic random
access memory (MRAM) or magnetic media. The spin-wave generation could provide
a new source of dc generated microwave radiation. We describe what has been
learned experimentally about these two related phenomena, and some models being
tested to explain these observations.Comment: 5 pages, 7 figures, expected to appear in conf. proceeding
(E)-4-Chloro-2-{[4-(3,5-dichloroÂpyridin-2-ylÂoxy)phenylÂimino]ÂmethÂyl}phenol
In the title molÂecule, C18H11Cl3N2O2, the central benzene ring is oriented at 8.44 (12) and 70.57 (11)° with respect to the terminal chloroÂphenol and dichloroÂpyridine rings, respectively. The molÂecular structure is stabilized by an intraÂmolecular O—H⋯N hydrogen bond, which generates an S(6) ring motif. In the crystal, π–π stacking between parallel pyridine rings is observed [centroid–centroid distance = 3.6561 (14) Å]
HyperNetX: A Python package for modeling complex network data as hypergraphs
HyperNetX (HNX) is an open source Python library for the analysis and
visualization of complex network data modeled as hypergraphs. Initially
released in 2019, HNX facilitates exploratory data analysis of complex networks
using algebraic topology, combinatorics, and generalized hypergraph and graph
theoretical methods on structured data inputs. With its 2023 release, the
library supports attaching metadata, numerical and categorical, to nodes
(vertices) and hyperedges, as well as to node-hyperedge pairings (incidences).
HNX has a customizable Matplotlib-based visualization module as well as
HypernetX-Widget, its JavaScript addon for interactive exploration and
visualization of hypergraphs within Jupyter Notebooks. Both packages are
available on GitHub and PyPI. With a growing community of users and
collaborators, HNX has become a preeminent tool for hypergraph analysis.Comment: 3 pages, 2 figure
Temporary bilateral sensorineural hearing loss following cardiopulmonary bypass -A case report-
Sudden sensorineural hearing loss has been reported to occur following anesthesia and various non-otologic surgeries, mostly after procedures involving cardiopulmonary bypass. Unilateral sensorineural hearing loss resulting from microembolism is an infrequent complication of cardiopulmonary bypass surgery that has long been acknowledged. Moreover, there are few reports on the occurrence of bilateral sensorineural hearing loss without other neurologic deficits and its etiology has also not been determined. We describe here a rare case of bilateral hearing loss without other neurologic deficits in an otherwise healthy 27-year-old woman who underwent cardiopulmonary bypass surgery for repair of severe mitral valve stenosis. The patient suffered from profound sensorineural hearing loss in both ears that was recognized immediately upon extubation, and audiometry tests confirmed the diagnosis. Without any treatment, her hearing recovered almost completely by the time of her discharge one week after surgery
The effects of incremental continuous positive airway pressure on arterial oxygenation and pulmonary shunt during one-lung ventilation
Topological dilaton black holes
In four-dimensional spacetime, when the two-sphere of black hole event
horizons is replaced by a two-dimensional hypersurface with zero or negative
constant curvature, the black hole is referred to as a topological black hole.
In this paper we present some exact topological black hole solutions in the
Einstein-Maxwell-dilaton theory with a Liouville-type dilaton potential.Comment: 8 pages, Revtex, no figure
Treating implicit trauma: a quasi-experimental study comparing the EMDR Therapy Standard Protocol with a ‘Blind 2 Therapist’ version within a trauma capacity building project in Northern Iraq
Psychological trauma is a silent epidemic which presents as a global public health issue, often in the form of post- traumatic stress disorder (PTSD). Eye Movement Desensitisation and Reprocessing (EMDR) Therapy is an empirically supported treatment intervention for PTSD and has been used as part of trauma-capacity building, particularly in low- and middle-income countries (LMIC). For some survivor’s, their trauma experiences cannot be spoken of: they may be alluded to, suggested and though not directly expressed. There are several factors as to why these implicit trauma experiences are ‘unspoken’, for example, when the trauma involves a deep-rooted sense of shame or guilt, a distorted sense of over-responsibility or when to speak of the trauma engenders fear of retribution, reprisal and consequence. This paper will explore the effectiveness of using two protocol variations of EMDR Therapy—standard versus a ‘Blind 2 Therapist’ protocol version as part of a quasi-experimental study which took place in Northern Iraq. The study contains two projects and subsequently tested several hypotheses regarding safety, effectiveness, efficiency and relevance of the ‘Blind 2 Therapist’ protocol within EMDR Therapy. Results indicated support for the B2T protocol intervention with various trauma populations including Yezidi survivors of Islamic State of Iraq and the Levant (ISIL)—also known as Daesh
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