Results 11 to 20 of about 2,231,192 (331)

On Special Berwald Metrics [PDF]

open access: yes, 2010
In this paper, we study a class of Finsler metrics which contains the class of Berwald metrics as a special case. We prove that every Finsler metric in this class is a generalized Douglas-Weyl metric.
Peyghan, Esmaeil, Tayebi, Akbar
core   +5 more sources

Quasi-metric and metric spaces [PDF]

open access: yesConformal Geometry and Dynamics of the American Mathematical Society, 2006
We give a short review of a construction of Frink to obtain a metric space from a quasi-metric space. By an example we illustrate the limits of the construction.
openaire   +4 more sources

The prevalence of onchocerciasis in Africa and Yemen, 2000–2018: a geospatial analysis

open access: yesBMC Medicine, 2022
Background Onchocerciasis is a disease caused by infection with Onchocerca volvulus, which is transmitted to humans via the bite of several species of black fly, and is responsible for permanent blindness or vision loss, as well as severe skin disease ...
Chris A. Schmidt   +8 more
doaj   +1 more source

Health system strategies to increase HIV screening among pregnant women in Mesoamerica

open access: yesPopulation Health Metrics, 2018
Background To propose health system strategies to meeting the World Health Organization (WHO) recommendations on HIV screening through antenatal care (ANC) services, we assessed predictors of HIV screening, and simulated the impact of changes in these ...
Charbel El Bcheraoui   +12 more
doaj   +1 more source

Predictive performance of international COVID-19 mortality forecasting models

open access: yesNature Communications, 2021
Forecasts of COVID-19 mortality have been critical inputs into a range of policies, and decision-makers need information about their predictive performance.
Joseph Friedman   +12 more
doaj   +1 more source

MORE ON THE METRIC SPACE OF METRICS [PDF]

open access: yesReal Analysis Exchange, 1995
The paper brings two results (about cardinality and porosity) of the metric space of metrics on a set \(X\).
openaire   +4 more sources

On length spectrum metrics and weak metrics on Teichmüller spaces of surfaces with boundary [PDF]

open access: yes, 2009
We define and study metrics and weak metrics on the Teichmüller space of a surface of topologically finite type with boundary. These metrics and weak metrics are associated to the hyperbolic length spectrum of simple closed curves and of properly ...
Liu, L.   +3 more
core   +2 more sources

Metric topological groups: their metric approximation and metric ultraproducts [PDF]

open access: yesGroups, Geometry, and Dynamics, 2018
We define a metric ultraproduct of topological groups with left-invariant metric, and show that there is a countable sequence of finite groups with left-invariant metric whose metric ultraproduct contains isometrically as a subgroup every separable topological group with left-invariant metric.
openaire   +4 more sources

Percept of the duration of a vibrotactile stimulus is altered by changing its amplitude

open access: yesFrontiers in Systems Neuroscience, 2015
There have been numerous studies conducted on time perception. However, very few of these have involved tactile stimuli to assess a subject’s capacity for duration discrimination. Previous optical imaging studies in non-human primates demonstrated that
Eric M Francisco   +5 more
doaj   +1 more source

Factors associated with the disbursements of development assistance for health in low-income and middle-income countries, 2002–2017

open access: yesBMJ Global Health, 2021
Introduction In 2017, development assistance for health (DAH) comprised 5.3% of total health spending in low-income countries. Despite the key role DAH plays in global health-spending, little is known about the characteristics of assistance that may be ...
Angela E Micah   +7 more
doaj   +1 more source

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