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Positive fixed points of lattices under semigroups of positive linear operators
(University of Hertfordshire, 1993)Let Z be a Banach lattice endowed with positive cone C and an order-continuous norm [...]. Let G be a semigroup of positive linear endomorphisms of Z. We seek conditions on G sufficient to ensure that the positive fixed ... -
Positive fixed points of lattices under semigroups of positive linear operators
(1995)Let Z be a Banach lattice endowed with positive cone C and an order-continuous norm ||.||. Let G be a semigroup of positive linear endomorphisms of Z... -
A Positive Future requires a positive intervention, or at least the intervention of some positivity
(World Journalism Education Council, 2013-07-04)Reading newspapers is an important part of journalism education. Ten years ago a survey revealed that journalism student did read newspapers and consume TV and radio news broadcasts. Since then major development in the ... -
Positive Geometries for Scattering Amplitudes in Momentum Space
(2023-05-25)Positive geometries provide a purely geometric point of departure for studying scattering amplitudes in quantum field theory. A positive geometry is a specific semi-algebraic set equipped with a unique rational top ... -
Positive power: Events as temporary sites of power which “empower” marginalised groups
(2021-05-06)Purpose: The importance of events for marginalised groups has largely been overlooked within tourism, hospitality and event studies. The purpose of this international study is to address this gap, emphasising the positive ... -
Positive power: Events as temporary sites of power which “empower” marginalised groups
(2021-05-06)Purpose: The importance of events for marginalised groups has largely been overlooked within tourism, hospitality and event studies. The purpose of this study is to address this gap, emphasising the positive outcomes of ... -
The positive tropical Grassmannian, the hypersimplex, and the m=2 amplituhedron
(2023-03-07)The study of the moment map from the Grassmannian to the hypersimplex, and the relation between torus orbits and matroid polytopes, dates back to the foundational 1987 work of Gelfand-Goresky-MacPherson-Serganova. On the ... -
Positive, site-specific associations between bone mineral status, fitness, and time spent at high-impact activities in 16- to 18-year-old boys
(2005)The incidence of hip and forearm fracture in elderly men in the United Kingdom is a public health issue, but there is limited knowledge on lifestyle factors affecting male bone health. The aim of this cross-sectional study ... -
Positron Annihilation in the Galaxy
(2019-03-13)The 511 keV line from positron annihilation in the Galaxy was the first γ-ray line detected to originate from outside our solar system. Going into the fifth decade since the discovery, the source of positrons is still ... -
Positron annihilation signatures associated with the outburst of the microquasar V404 Cygni
(2016-03-17)Microquasars1, 2, 3, 4 are stellar-mass black holes accreting matter from a companion star5 and ejecting plasma jets at almost the speed of light. They are analogues of quasars that contain supermassive black holes of 106 ... -
The Possibility of Over the Phone Traumatisation: A Repertory Grid Study Investigating Secondary Traumatic Stress in Samaritan Crisis Line Volunteers
(2011-09-13)Background: The literature suggests a consensus that individuals can become traumatised through listening to another’s trauma. Much of this research, however, has focused on individuals who have had direct, face-to-face ... -
Possible changes to arable crop yields by 2050
(2010-09-27)By 2050, the world population is likely to be 9.1 billion, the CO2 concentration 550 ppm, the ozone concentration 60 ppb and the climate warmer by ca 2 degrees C. In these conditions, what contribution can increased crop ... -
Possible discovery of Calvera's supernova remnant
(2022-11-01)We report the discovery of a ring of low surface brightness radio emission around the Calvera pulsar, a high Galactic latitude, isolated neutron star, in the LOFAR Two-metre Sky Survey (LoTSS). It is centered at α = ... -
The possible mechanism of silver nanoparticle impact on hippocampal synaptic plasticity and spatial cognition in rats
(2012-03-25)Silver nanoparticles (Ag-np) are very promising engineered nanomaterials which play an important role in the world biomedical, healthcare and in general nanotechnology applications. With the most impressive effect in ... -
Possible mechanisms of CO2 reduction by H2 via prebiotic vectorial electrochemistry
(2019-10-18)Methanogens are putatively ancestral autotrophs that reduce CO 2 with H 2 to form biomass using a membrane-bound, proton-motive Fe(Ni)S protein called the energy-converting hydrogenase (Ech). At the origin of life, ... -
The Possible Role of Prescribing Medications, Including Central Nervous System Drugs, in Contributing to Male-Factor Infertility (MFI): Assessment of the Food and Drug Administration (FDA) Pharmacovigilance Database
(2023-12-31)Background: A wide range of medications may have a possible role in the development of male-factor infertility (MFI), including various antineoplastic agents, testosterone/anabolic steroids, immunosuppressive drugs/immun ... -
A possible signature of the influence of tidal perturbations in dwarf galaxy scaling relations
(2023-03-02)Dwarf galaxies are excellent cosmological probes, because their shallow potential wells make them very sensitive to the key processes that drive galaxy evolution, including baryonic feedback, tidal interactions, and ram ... -
Possible solution to the alpha-potential mystery in the gamma-process and the Nd/Sm ratio in meteorites
(SISSA, 2012-08)The 146Sm/144Sm ratio in the early solar system has been constrained by Nd/Sm isotope ratios in meteoritic material. Predictions of 146Sm and 144Sm production in the gamma-process in massive stars are at odds with these ... -
The possible use of precision tinted lenses to improve social cognition in children with Autism Spectrum Disorders
(2020-05)A masked randomised control design compared the effectiveness of precision ophthalmic tints in improving the recognition of emotion in Autism Spectrum Disorders (ASD). Fourteen children aged 10-14 with ASD and 14 control ...