Results 181 to 190 of about 5,027 (287)

STS-6 sixth Space Shuttle mission. First flight of the Challenger [PDF]

open access: yes
A prelaunch summary of the sixth Space Shuttle mission is provided. The Challenger orbiter; launching; uprated engines; lighter weight boosters; lightweight tank; external tank reduction; landing; the tracking and data relay satellite system (TDRSS ...

core   +1 more source

Recent Advances in Nickel Catalysts for Sonogashira Coupling

open access: yesChemistryOpen, Volume 15, Issue 5, May 2026.
The Sonogashira coupling, catalyzed by transition metals, has become a valuable method for forming carbon‐carbon bonds. Nickel has gained considerable interest due to its lower cost and more environmentally friendly profile compared to palladium.
Sara Payamifar   +2 more
wiley   +1 more source

Analysis and verification of key technologies for the electrical system of power-concentrated EMUs

open access: yes机车电传动
This paper introduced the research progress and typical applications of power-concentrated EMUs abroad and provided a preliminary comparative analysis of system configurations among various EMU models.
LI Peng, ZOU Zhichao
doaj  

Wheel/rail load distribution characteristics of high speed EMU [PDF]

open access: yesChinese Science Bulletin, 2019
Dandan Song   +4 more
openaire   +1 more source

Different Routes for Camellia Sinensis–Mediated Synthesis of Iron Oxide Nanoparticles: Structural, Thermal, and Magnetic Properties

open access: yesChemistrySelect, Volume 11, Issue 19, 20 May 2026.
Different green‐assisted routes (After Synthesis—ASR; Green Subsequent—SSR; Green in situ—ISSR) using Camellia sinensis to produce functionalized iron‐based oxide nanoparticles with controlled and distinct structural and magnetic properties. ABSTRACT Green‐assisted iron oxide nanoparticles (NPs) were synthesized using Camellia sinensis extract (green ...
Jeferson Marques Santos   +3 more
wiley   +1 more source

Morphological Evaluation of the Hip Joint and Pelvic Limb Bones of the Lowland Tapir (Tapirus terrestris Linnaeus, 1758) Using Radiography and Computed Tomography

open access: yesAnatomia, Histologia, Embryologia, Volume 55, Issue 3, May 2026.
ABSTRACT The study aimed to characterize, through imaging examinations—including radiographs and computed tomography—the hip joint and the bones of the thigh, leg and feet in Lowland tapirs (Tapirus terrestris). Ten pelvic limbs were collected, two from juveniles and the remaining from adults. The femoral head exhibited a rounded morphology with a well‐
Heloísa Coppini de Lima   +6 more
wiley   +1 more source

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