Results 21 to 30 of about 1,662,855 (280)

The VIMOS Public Extragalactic Redshift Survey (VIPERS). Never mind the gaps: comparing techniques to restore homogeneous sky coverage [PDF]

open access: yes, 2014
[Abridged] Non-uniform sampling and gaps in sky coverage are common in galaxy redshift surveys, but these effects can degrade galaxy counts-in-cells and density estimates.
Adami, C.   +30 more
core   +4 more sources

Airborne Lidar Sampling Strategies to Enhance Forest Aboveground Biomass Estimation from Landsat Imagery

open access: yesRemote Sensing, 2019
Accurately estimating aboveground biomass (AGB) is important in many applications, including monitoring carbon stocks, investigating deforestation and forest degradation, and designing sustainable forest management strategies.
Siqi Li   +2 more
doaj   +1 more source

Nexus Between Equity Pricing Models and Equity Price Fragility: Empirical Insights From Pakistan

open access: yesFrontiers in Energy Research, 2022
Purpose: The study tests conventional and behavioral pricing multifactor impact on price fragility from the equity market of Pakistan.Methodology: The positivist approach is used to deduct study rationale via probability sampling.
Muhammad Khalid Anser   +7 more
doaj   +1 more source

Systematic errors in Gaussian Quantum Monte Carlo and a systematic study of the symmetry projection method [PDF]

open access: yes, 2008
Gaussian Quantum Monte Carlo (GQMC) is a stochastic phase space method for fermions with positive weights. In the example of the Hubbard model close to half filling it fails to reproduce all the symmetries of the ground state leading to systematic errors
Assaad, F. F.   +5 more
core   +4 more sources

Placental Sampling for Understanding Viral Infections - A Simplified Protocol for the COVID-19 Pandemic

open access: yesRevista Brasileira de Ginecologia e Obstetrícia, 2021
Objective The coronavirus disease 2019 (COVID-19) is a pandemic viral disease, caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).
Guilherme de Moraes Nobrega   +5 more
doaj   +1 more source

Obtaining self-samples to diagnose curable sexually transmitted infections: a systematic review of patients' experiences [PDF]

open access: yes, 2015
BACKGROUND: Routine screening is key to sexually transmitted infection (STI) prevention and control. Previous studies suggest that clinic-based screening programmes capture only a small proportion of people with STIs.
Lau, Jason   +4 more
core   +4 more sources

Continuous measurement of nitrate concentration in a highly event-responsive agricultural catchment in south-west of France: is the gain of information useful? [PDF]

open access: yes, 2012
A nitrate sensor has been set up to measure every 10 min the nitrate signal in a stream draining a small agricultural catchment dominated by fertilized crops during a 2-year study period (2006–2008) in the south-west of France.
Dugast, Philippe   +7 more
core   +4 more sources

About the benefits of poststratification in forest inventories

open access: yesJournal of Forest Science, 2007
A large virtual population is created based on the GIS data base of a forest district and inventory data. It serves as a population where large scale inventories with systematic and simple random poststratified estimators can be simulated and the gains ...
J. Saborowski, J. Cancino
doaj   +1 more source

Assessment of Sample Size Calculations Used in Aquaculture by Simulation Techniques

open access: yesFrontiers in Veterinary Science, 2020
An adequate sampling methodology is the key to knowing the health status of aquatic populations. Usually, the aims of epidemiological surveys in aquaculture are to detect an infection and estimate the disease prevalence, and different formulas are used ...
Ignacio de Blas   +3 more
doaj   +1 more source

Efficiency of adaptive cluster sampling and traditional sampling for coastal mangrove in Hainan of China

open access: yesJournal of Forest Science, 2012
Based on two species of Coastal Mangrove in Hainan of China, Sonneratia Apetala Buch-Ham and Sonneratia caseoli, we estimated the density of the two species to evaluate the efficiency of adaptive cluster sampling (ACS), simple random sampling (SRS) and ...
Y. Lei, J. Shi, T. Zhao
doaj   +1 more source

Home - About - Disclaimer - Privacy