Results 1 to 10 of about 6,091,234 (258)

Direct Sampling for Recovering Sound Soft Scatterers from Point Source Measurements

open access: yesComputation, 2021
In this paper, we consider the inverse problem of recovering a sound soft scatterer from the measured scattered field. The scattered field is assumed to be induced by a point source on a curve/surface that is known.
Isaac Harris
doaj   +3 more sources

Analyses of Sampling Disturbance of the Lunar Surface in Direct Push Sampling Method

open access: yesIEEE Access, 2018
The study of direct push sampling characteristics forms the theoretical basis for deep sampling tool design. In this paper, a ground test of the direct push sampling was carried out to analyze three influencing factors: tube diameter; friction ...
Dewei Tang   +4 more
doaj   +3 more sources

Negative result of multi-frequency direct sampling method in microwave imaging

open access: yesResults in Physics, 2019
A negative result of multi-frequency direct sampling method (DSM) for imaging small anomaly from scattering parameters in microwave imaging was exhibited.
Won-Kwang Park
doaj   +3 more sources

Evolution of the magmatic-hydrothermal system at Lastarria volcano (Northern Chile) between 2006 and 2019: Insights from fluid geochemistry

open access: yesFrontiers in Earth Science, 2023
One of the major problems in the volcanic surveillance is how data from several techniques can be correlated and used to discriminate between possible precursors of volcanic eruptions and changes related to non-eruptive processes.
Susana Layana   +14 more
doaj   +1 more source

Direct Sampling for Spatially Variable Extreme Event Generation in Resampling‐Based Stochastic Weather Generators

open access: yesJournal of Advances in Modeling Earth Systems, 2023
Resampling‐based weather generators simulate new time series of weather variables by reordering the observed values such that the statistics of the simulated data are consistent with the observed ones.
Jorge Guevara   +10 more
doaj   +1 more source

Conditioning Multiple‐Point Statistics Simulation to Inequality Data

open access: yesEarth and Space Science, 2021
Stochastic modeling is often employed in environmental sciences for the analysis and understanding of complex systems. For example, random fields are key components in uncertainty analysis or Bayesian inverse modeling.
Julien Straubhaar, Philippe Renard
doaj   +1 more source

Validation of a nutria (Myocastor coypus) environmental DNA assay highlights considerations for sampling methodology

open access: yesEnvironmental DNA, 2023
Nutria (Myocastor coypus) is a semiaquatic rodent species that is invasive across multiple regions within the United States. Here, we evaluated a qPCR assay previously described for use in Japan for application across invasive populations in the United ...
Anna M. Mangan   +4 more
doaj   +1 more source

Registro preliminar de la herpetofauna asociada a bosque de galería y a la subcuenca del río Camoa de la Reserva El Caduceo, San Martín, Meta, Colombia

open access: yesMutis, 2020
Actualmente, en La Reserva Natural El Caduceo, San Martín, Meta, se han registrado cerca de 18 especies de anfibios y 27 de reptiles. Sin embargo, los registros existentes no son suficientes para determinar el estado de sus comunidades, lo que hace cada ...
Valentina Giraldo Gutiérrez   +4 more
doaj   +1 more source

Comparison of reference distributions acquired by direct and indirect sampling techniques: exemplified with the Pediatric Reference Interval in China (PRINCE) study

open access: yesBMC Medical Research Methodology, 2022
Background Our study aimed to compare the reference distributions of serum creatinine and urea obtained by direct sampling technique and two indirect sampling techniques including the Gaussian Mixture Model (GMM) and the Self-Organizing Map (SOM ...
Ruohua Yan   +7 more
doaj   +1 more source

Sampling Methodology of Alphitobius diaperinus (Coleptera: Tenebrionidae) Population in Poultry Houses [PDF]

open access: yesBrazilian Archives of Biology and Technology, 2019
This paper describes a methodology to evaluate Alphitobius diaperinus (Darkling beetle) population in order to estimate the effectiveness of control methods, consisting of direct sample collections from the poultry litter in 18 points, counting of adults
Daian Guilherme Pinto de Oliveira   +3 more
doaj   +1 more source

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