Results 11 to 20 of about 4,426,812 (303)

Estimating the Bot Population on Twitter via Random Walk Based Sampling

IEEE Access, 2022
The rise of social bots, which contribute to marketing, political intervention, and the spread of fake news, has been noted. Analysis methods for the characteristics of Twitter bots have been developed for third-party researchers who have access ...
Mei Fukuda, Kazuki Nakajima, Kazuyuki Shudo   +2 more
doaj   +1 more source

Prototype-based sampling

, 2022
A prototype-based sampling method for spatial data sampling and its application in landslide susceptibility mapping 
Prototype-based sampling (14190421)
core   +1 more source

Merging Unmanned Aerial Systems (UAS) Imagery and Echo Soundings with an Adaptive Sampling Technique for Bathymetric Surveys

Remote Sensing, 2018
Bathymetric surveying to gather information about depths and underwater terrain is increasingly important to the sciences of hydrology and geomorphology.
Laura V. Alvarez, Hernan A. Moreno, Antonio R. Segales, Tri G. Pham, Elizabeth A. Pillar-Little, Phillip B. Chilson   +5 more
doaj   +1 more source

Quantitative estimation of sampling uncertainties for mycotoxins in cereal shipments [PDF]

, 2012
Many countries receive shipments of bulk cereals from primary producers. There is a volume of work that is ongoing that seeks to arrive at appropriate standards for the quality of the shipments and the means to assess the shipments as they are out-loaded.
Bourgeois, Florent, Lyman, Geoffrey, Lyman, Geoffrey J.   +2 more
core   +1 more source

TEXT CLUSTERING ONLINE LEARNING OPINION DURING COVID-19 PANDEMIC IN INDONESIA USING TWEETS

Barekeng, 2022
To prevent the spread of corona virus, restriction of social activities are implemented including school activities which reaps the pros and cons in community. Opinions about online learning are widely conveyed mainly on Twitter.
Maulida Fajrining Tyas, Anang Kurnia, Agus Mohamad Soleh   +2 more
doaj   +1 more source

A New All-Season Passive Sampling System for Monitoring H2S in Air

The Scientific World Journal, 2002
A new Maxxam All-Season Passive Sampling system for monitoring H2S in air has been developed. This passive sampling system employs the same approaches as the Maxxam All-Season Passive Sampling Systems for monitoring SO2, NO2, and O3 reported previously ...
Hongmao Tang, James Sandeluk, Linda Lin, J. WIlliam Lown   +3 more
doaj   +1 more source

Evaluation of respondent-driven sampling [PDF]

, 2012
Respondent-driven sampling produced a generally representative sample of this well-connected nonhidden population. However, current respondent-driven sampling inference methods failed to reduce bias when it occurred.
Joseph Katongole, Hayes, Richard J., Janet Seeley, Natasha L. Lunel, Tarsh, Matilda N., Richard J. Hayes, Maher, Dermot, Sonnenberg, Pam, Tarsh, Matilda N, Johnston, Lisa G., Hayes, Richard J, White, Richard G, White, Richard G., Lunel, Natasha L, Richard Ndunguse, Copas, Andrew J, Matilda N. Tarsh, Frost, Simon DW, Richard G. White, Andrew J. Copas, Seeley, Janet, Fatima Jichi, McCreesh, Nicky, Nicky McCreesh, Simon D. W. Frost, Lunel, Natasha L., Copas, Andrew J., Jichi, Fatima, Pam Sonnenberg, Frost, Simon D. W., Ndunguse, Richard, Lisa G. Johnston, Johnston, Lisa G, Katongole, Joseph, Dermot Maher   +34 more
core   +1 more source

Introduction to Maxxam All-Season Passive Sampling System and Principles of Proper Use of Passive Samplers in the Field Study

The Scientific World Journal, 2001
Maxxam all-season passive sampling system (PASS) is introduced in this paper. The PASS can be used to quantitatively and accurately monitor SO2 , NO2, O 3, and H2 S in air in all weather conditions with flexible exposure times from several hours to ...
Hongmao Tang
doaj   +1 more source

Spatially correlated Poisson sampling [PDF]

, 2012
A new method for sampling from a finite population that is spread in one, two or more dimensions is presented. Weights are used to create strong negative correlations between the inclusion indicators of nearby units.
Grafström, Anton, Anton Grafström, Grafström, Anton,, Sveriges lantbruksuniversitet.   +3 more
core   +1 more source

Moving towards a Network of Autonomous UAS Atmospheric Profiling Stations for Observations in the Earth’s Lower Atmosphere: The 3D Mesonet Concept

Sensors, 2019
The deployment of small unmanned aircraft systems (UAS) to collect routine in situ vertical profiles of the thermodynamic and kinematic state of the atmosphere in conjunction with other weather observations could significantly improve weather forecasting
Phillip B. Chilson, Tyler M. Bell, Keith A. Brewster, Gustavo Britto Hupsel de Azevedo, Frederick H. Carr, Kenneth Carson, William Doyle, Christopher A. Fiebrich, Brian R. Greene, James L. Grimsley, Sai Teja Kanneganti, Joshua Martin, Andrew Moore, Robert D. Palmer, Elizabeth A. Pillar-Little, Jorge L. Salazar-Cerreno, Antonio R. Segales, Mark E. Weber, Mark Yeary, Kelvin K. Droegemeier   +19 more
doaj   +1 more source