Results 291 to 300 of about 47,305 (354)

Strategic placement of alternative fueling stations in the UAE. [PDF]

open access: yesSci Rep
Alshehhi H   +4 more
europepmc   +1 more source

In Situ Tailoring of FCC Ductile Phases for High‐Strength Wear‐Resistant Crack‐Free W‐Based Metallic Coatings

open access: yesRare Metals, EarlyView.
ABSTRACT Tungsten is inherently brittle and particularly prone to thermal stress concentration and crack formation during additive manufacturing processes such as laser cladding, which severely limits its engineering applications as a coating material. To address this issue, this study proposes an in situ toughening strategy involving the introduction ...
Guo‐Xing Chen   +12 more
wiley   +1 more source

Friction Shock Absorbers and Reverse Thrust for Fast Multirotor Landing on High‐Speed Vehicles

open access: yesJournal of Field Robotics, EarlyView.
ABSTRACT Typical landing gears of small uninhabited aerial vehicles (UAV) limit their capability to land on vehicles moving at more than 20–50 km/h due to high drag forces, high pitch angles and potentially high relative horizontal velocities. To enable landing at higher speeds, a combination of lightweight friction shock absorbers and reverse thrust ...
Isaac Tunney   +2 more
wiley   +1 more source

Quantifying aboveground herbaceous biomass in grassy ecosystems: a comparison of field and high‐resolution UAV‐LiDAR approaches

open access: yesRemote Sensing in Ecology and Conservation, EarlyView.
The abundance of herbaceous vegetation in grassy ecosystems—which cover >25% of the world's land surface—is highly variable and impacts key ecological processes including carbon sequestration and support for grazing wildlife and livestock. Here, we present a method for using high‐resolution, UAV‐borne Light Detection and Ranging (LiDAR) to estimate ...
Tyler C. Coverdale   +3 more
wiley   +1 more source

Assessing the Accuracy of Global HFC-134a Satellite Observations from Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) via Aircraft, Balloon, and Model Comparisons. [PDF]

open access: yesEnviron Sci Technol
Li Y   +21 more
europepmc   +1 more source

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