Results 71 to 80 of about 142,701 (255)

Ecological drivers and phylogenetic patterns of leaf minimum conductance variability in vascular plants

open access: yesNew Phytologist, EarlyView.
Summary Stomatal closure prevents significant water losses during drought events. Yet, leaves are not perfectly hermetic and dehydration ensues through residual water losses, known as minimum conductance (gmin), which is highly relevant since it informs on the water depletion dynamics under stress.
Santiago Trueba   +8 more
wiley   +1 more source

The X-ray spectrum of the Seyfert I galaxy Markarian 766: Dusty warm absorber or relativistic emission lines? [PDF]

open access: yes, 2003
Competing models for broad spectral features in the soft X-ray spectrum of the Seyfert I galaxy Mrk 766 are tested against data from a 130 ks XMM-Newton observation.
Behar, E   +12 more
core  

A Review of the Applications and Challenges of Pulsed Electric Fields in Fish Ecological Protection

open access: yesAquaculture, Fish and Fisheries, Volume 6, Issue 3, June 2026.
ABSTRACT The use of pulsed electric fields (PEF) to regulate fish swimming patterns, especially during migratory channel restoration in dammed rivers, faces significant operational challenges. These challenges can generally be attributed to the multifaceted nature of fish behaviour and limitations in research on physical interception methods.
Ting Li   +8 more
wiley   +1 more source

On prediction errors in regression models with nonstationary regressors

open access: yes, 2006
In this article asymptotic expressions for the final prediction error (FPE) and the accumulated prediction error (APE) of the least squares predictor are obtained in regression models with nonstationary regressors. It is shown that the term of order $1/n$
Ing, Ching-Kang, Sin, Chor-Yiu
core   +1 more source

Patterns of River Flow Regulation Across the World's Climate Regions

open access: yesHydrological Processes, Volume 40, Issue 5, May 2026.
We quantify the Impoundment Ratio (IR) for 16 060 dams worldwide to assess how reservoir capacity relative to natural runoff varies across climate regions. One‐third of dams have IR ≥ 1, with the highest values in arid and semi‐arid zones and clear national contrasts within similar climates.
Xin Yi Chong   +2 more
wiley   +1 more source

Vector Field‐Based Collision‐Free Navigation in Tunnel‐Like Environments

open access: yesJournal of Field Robotics, Volume 43, Issue 3, Page 2521-2547, May 2026.
ABSTRACT Tunnel‐like environments, renowned for their vast scale, confined spaces, and limited visibility, present significant challenges for autonomous robot navigation. This study addresses the critical issue of guiding robots through such environments while ensuring collision‐free navigation and maintaining a specified safety margin from both tunnel
Bao Jianjun   +5 more
wiley   +1 more source

A green nanocomposite suppresses asphaltene precipitation in carbonates via multiscale evaluation

open access: yesScientific Reports
Asphaltene precipitation in carbonate reservoirs presents a significant flow assurance challenge. This study investigates a novel ZnO/SiO₂/xanthan/eucalyptus nanocomposite (NCs) for inhibiting asphaltene deposition.
Yaser Ahmadi, David A. Wood
doaj   +1 more source

Algebra of screening operators for the deformed $W_n$ algebra

open access: yes, 1997
We construct a family of intertwining operators (screening operators) between various Fock space modules over the deformed $W_n$ algebra. They are given as integrals involving a product of screening currents and elliptic theta functions.
Feigin, B.   +4 more
core   +1 more source

A Meta‐Analysis on Environmental Triggers of Spawning Migrations Reveals a New Classification of Thermal Guilds in European Freshwater Fishes

open access: yesFish and Fisheries, Volume 27, Issue 3, Page 478-495, May 2026.
ABSTRACT Fish migration through river networks is essential for completing life cycles and accessing critical habitats, but fragmentation increasingly disrupts spawning movements. In Europe, over one million barriers limit connectivity and create trade‐offs between ecological integrity and human uses, such as hydropower, flood control, fisheries and ...
Christian Schlautmann   +5 more
wiley   +1 more source

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