Results 41 to 50 of about 15,180 (210)

Validation of the Reliability of the Porous Structure Parameters for Activated Carbons as Evaluated on the Basis of Adsorption Isotherms from the Gaseous Phase

open access: yesAdsorption Science & Technology, 1999
Adsorption/desorption isotherms from the gaseous phase (benzene vapour, nitrogen) have been determined consecutively a number of times on the same activated carbon sample.
Bogdan J. Trznadel   +2 more
doaj   +1 more source

International Intercomparison of Primary Photovoltaic Reference Cell Calibrations With Excellent Agreement

open access: yesSolar RRL, Volume 10, Issue 17, 15 September 2026.
Three leading metrology institutes—PTB, NLR, and AIST—compare their primary calibration methods for photovoltaic reference devices following IEC 60904‐4. Four WPVS solar cells with distinct optical characteristics circulate between laboratories. Despite differing measurement principles, all results agree within stated uncertainties, with maximum ...
Ingo Kröger   +3 more
wiley   +1 more source

Landcover degradation analysis of Mediterranean forest by means of hyperplanes obtained from mixture linear algorithms (MLA) [PDF]

open access: yes, 2009
The percentage alteration of the Mediterranean forest landscape is one of the primary indicators for its degradation. In this sense, the land cover abundances change analysis by using mixture linear algorithms (MLA), is presented like a good alternative ...
Vázquez Sierra, José Manuel   +2 more
core  

Experimental assessment of large mammal population estimates from airborne thermal videography

open access: yesWildlife Biology, Volume 2026, Issue 5, September 2026.
Wildlife resource management requires reliable, fast, and affordable methods of surveying wildlife populations to develop and adaptively adjust policies. Thermal video from drones can yield high rates of detection over large areas with relative speed and safety.
Julia S. McElhinny   +7 more
wiley   +1 more source

Advances in Radiometry Research [PDF]

open access: yes, 2019
Radiometry is a fascinating, fast growing research area, and there are many interesting real life applications. This book is intended to provide readers the theoretical background of radiometry, a resource of the latest radiometry technology, as well as ...
Xiao, P.
core  

The Reevaluation of MIBI as the Ligand of 99mTc-MIBI Radiopharmaceutical for Myocardial Imaging

open access: yesAtom Indonesia, 2008
Methoxy isobutyl isonitrile labelled with technetium-99m (99mTc) radionuclide can be used for the evaluation of acute myocardial infarction. The 99mTc-MIBI radiopharmaceutical is available in the lyophilized-kit, which is separately packed with its ...
Z. Nurlaila, I. Daruwati
doaj   +1 more source

Ferric Chloride: The Venusian Unknown UV Absorber?

open access: yesJournal of Geophysical Research: Planets, Volume 131, Issue 9, September 2026.
Abstract Near‐ultraviolet imaging of the planet Venus reveals inhomogeneous absorption features in the otherwise bright clouds. This absorption has been studied for nearly 100 years, but identification of the near‐UV absorber remains one of the largest open questions in Venusian research.
Joanna V. Egan   +8 more
wiley   +1 more source

CbPM Estimates of Net Primary Production in the North Atlantic From Profiling Floats and Satellites Diverge Seasonally Due To Fluorescence and Vertical Extrapolation Effects

open access: yesGlobal Biogeochemical Cycles, Volume 40, Issue 8, August 2026.
Abstract Marine net primary production (NPP), defined as the difference between gross production and phytoplankton respiration, is often estimated using algorithms applied to remote sensing data. While assumptions are needed to extend surface satellite observations through depth, some NPP algorithms, like the Carbon‐based Productivity Model (CbPM ...
Nina Buzby   +5 more
wiley   +1 more source

Peculiar Magnetosphere‐Atmosphere Coupling and Its Impacts Over the South American Magnetic Anomaly Region

open access: yesJournal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract The auroral‐like sporadic E‐layer is typically observed at altitudes between 100 and 150 km within the South American Magnetic Anomaly region. However, the occurrence of an unusual layer event detected above this altitude range on 18 July 2017 has raised intriguing questions regarding the physical processes responsible for the substantial ...
Lígia A. Da Silva   +21 more
wiley   +1 more source

Blackbody radiometry

open access: yes, 2020
This book, the first of a two-volume set, focuses on the basic physical principles of blackbody radiometry and describes artificial sources of blackbody radiation, widely used as sources of optical radiation, whose energy characteristics can be ...
Sapritsky, Victor, Prokhorov, Alexander
core   +1 more source

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