Results 91 to 100 of about 5,652 (312)

Patterns of understorey bird diversity across Amazonian forests: survey effort and range maps predict local species richness

open access: yesEcography, EarlyView.
Species diversity typically increases from higher to lower latitudes, but the regional‐scale variation along this geographic gradient remains unclear. It has been suggested that species diversity throughout Amazonia generally increases westward toward the Andes, but this pattern and its environmental determinants require further investigation for most ...
Pilar L. Maia‐ Braga   +14 more
wiley   +1 more source

Virtual element method for the Laplacian eigenvalue problem with Neumann boundary conditions

open access: yesAIMS Mathematics
The Laplacian eigenvalue problem is fundamental to the free vibration problem. The finite element method (FEM) is a classical numerical method for solving eigenvalue problems.
Junchi Ma, Lin Chen, Xinbo Cheng
doaj   +1 more source

Polygon Mesh Generation of Branching Structures [PDF]

open access: yes, 2005
We present a new method for producing locally non intersecting polygon meshes of naturally branching structures. The generated polygon mesh follows the object's underlying structure as close as possible, while still producing polygon meshes that can be visualized efficiently on commonly available graphic acceleration hardware.
Jo Skjermo, Ole Christian Eidheim
openaire   +1 more source

From shadows to data: first robust population assessment of snow leopards in Pakistan

open access: yesEcography, EarlyView.
The snow leopard Panthera uncia is a flagship species of the greater Himalayan region and symbolizes the integrity of this ecological system. Within the greater Himalayas, Pakistan holds special significance as the north of the country represents a confluence of three major mountain ranges (Hindu Kush, Pamir–Karakoram, and Himalaya).
Muhammad Ali Nawaz   +9 more
wiley   +1 more source

Meshing or Clashing Gears? Design (In)Coherences Between the EU Regulation on Deforestation‐Free Products and Third Country Environmental Regulations

open access: yesEnvironmental Policy and Governance, EarlyView.
ABSTRACT As new regulations emerge to address deforestation and unsustainable land use, their interaction with existing national frameworks remains uncertain. This study examines the (in)coherence between the European Union Regulation on deforestation‐free products (EUDR) and domestic deforestation and land use regulations in Brazil, Cameroon and Gabon.
R. F. Ziegert   +5 more
wiley   +1 more source

Space‐Time FEM Solution of Dynamic Contact Problem With Discontinuous Velocity for Multiple Impact of Deformed Bar Using PDAS Method

open access: yesMathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT A class of one‐dimensional impact and dynamic contact problems taking into account non‐smooth velocities is studied. The new space‐time finite element approximation of dynamic variational inequalities is suggested. The non‐smooth solution for the impact of an obstacle by an elastic bar and its energy conservation under persistency conditions ...
Victor A. Kovtunenko   +2 more
wiley   +1 more source

An Effective Method for Slicing Triangle Meshes Using a Freeform Curve

open access: yesMathematics
Slicing 3D polygonal meshes is a fundamental operation in various applications such as virtual surgery, garment simulation, and game development. Existing methods primarily slice meshes using either a single line or a set of line segments approximating a
Seung-Yong Lee   +2 more
doaj   +1 more source

Dose‐Dependent Effects of Biochar on Soil Revealed by Fast Field‐Cycling (FFC) NMR: From Molecular Water Dynamics to Soil Functionality

open access: yesMagnetic Resonance in Chemistry, EarlyView.
Dose–response of biochar in a clay soil: fifteen mixtures (fBC 0–1) reveal nonlinear thresholds (pH/EC) and sharp WHC gains near fBC ≈ 0.3–0.5. Coupled FT‐IR and FFC‐NMR (0.01–10 MHz; ModelFree τc distributions) link water dynamics to soil functionality.
Calogero Librici   +6 more
wiley   +1 more source

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