Results 51 to 60 of about 128,880 (312)
Imagining the Heavens: Adam Elsheimer’s Flight into Egypt and the Renaissance Night Sky
Journal for the History of Knowledge, 2021 Adam Elsheimer’s The Flight into Egypt (1609) has triggered a longstanding debate among art historians. For the last five decades, Elsheimer’s novel naturalistic representation of the night sky in his painting on copper has been linked to Galileo’s ...
Stefan Zieme
doaj +1 more source
N‐Alkoxysulfurdiimide Reagents for the One‐Step Modular Synthesis of Primary Sulfonimidamides
Angewandte Chemie, EarlyView.N‐Alkoxysulfurdiimide reagents when combined with organometallic reagents lead directly to primary sulfonimidamide products. The reactions are broad in scope, encompassing aryl, heteroaryl, and alkyl carbon substituents. The reactivity of the N‐alkoxysulfurdiimide reagents can be correlated with the electron‐withdrawing ability of the N‐substituent ...
Suzanne E. Davison +6 more
wiley +2 more sources
Versatile Pneumatic Twisted Coiled Actuators Enabled by Fiber‐Polymer Composite Fabrication
Advanced Functional Materials, EarlyView.This work reports composite Pneumatic Twisted Coiled Actuators with embedded Kevlar fibers that convert pneumatic or hydraulic pressure into powerful linear motion. A novel precise manufacturing technique is used to systematically explore how design variables influence actuator mechanics and dynamics.
William J. Townsend +5 more
wiley +1 more source
Sustainable Pd‐Catalyzed Aminations “on Dirty Water”
Angewandte Chemie, EarlyView.Aminations, done safely yet neat, and therefore, quickly, using low levels of Pd, in “dirty water” that must contain 30% KOH; not NaOH, and not at 5%,10%, 20%, 40%, or 50% KOH. Moreover, no base sensitivity of functional groups! Very cool. Thank you, Nature.
Erfan Oftadeh +4 more
wiley +2 more sources
Grinding metre scale mirror segments for the E-ELT ground based telescope [PDF]
, 2011 The next generation of ground based telescopes require many hundreds of metre scale off-axis mirrors. In this paper the grinding of a 1.45m scale Zerodur® mirror segment for the European Extremely Large Telescope (E-ELT) is introduced.
P. Shore +7 more
core +1 more source
Implementation of a laser-truss based telescope metrology system at the Large Binocular Telescope [PDF]
, 2020 Large ground-based telescopes are prone to perturbations caused by environmental factors that affect the mechanical structure of the telescope that can cause collimation loss and image quality degradation.
Kim, Dae Wook +7 more
core +1 more source
Charge Generation and Recombination Pathways in All‐Polymer Bulk Heterojunction Solar Cells
Advanced Functional Materials, EarlyView.Multimodal spectroscopy and device analysis reveal how field‐dependent charge generation, transport limitations, and non‐geminate recombination govern performance losses in all polymer solar cells. The results identify the key processes controlling charge extraction and recombination, providing insights for the design of more efficient all‐polymer ...
Shahidul Alam +17 more
wiley +1 more source
Gazi Üniversitesi Fen Bilimleri DergisiThe study aims experimental investigation of the sigma vectors in Nodal Aberration Theory for a customized non-aplanatic high-precision Cassegrain telescope under coma-free pivot point (CFPP) misalignment conditions.
Meltem Yeşiltepe +1 more
doaj +1 more source
The 50 cm telescope of Hoa Lac observatory: an introduction
Vietnam Journal of Science, Technology and Engineering, 2022 The Vietnam National Space Center has recently established an observatory in Hoa Lac, near Ha Noi. The observatory is equipped with a 50 cm diameter Ritchey-Chrétien optical telescope.
Nguyen Thi Thao +5 more
doaj +1 more source
, 2012 A Liverpool John Moores University resource - Dr Robert Fosbury Discusses the past two decades of the Hubble ...
Liverpool John Moores University +1 more
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