Results 71 to 80 of about 9,879 (221)
An analytical method for designing low noise helicopter transmissions [PDF]
The development and experimental validation of a method for analytically modeling the noise mechanism in the helicopter geared power transmission systems is described. This method can be used within the design process to predict interior noise levels and
Bossler, R. B., Jr. +2 more
core +1 more source
Triplet 4‐Nitrenemethyl‐Pyridine‐N‐Oxide: A Model Alkyl Nitrene Isolated in Cryogenic Matrices
Journal of Physical Organic Chemistry, Volume 39, Issue 5, May 2026.The simplest triplet alkyl nitrene bearing a pyridine‐N‐oxide moiety was generated by direct irradiation (λ > 350 nm) of the corresponding azide in an Ar matrix at 15 K. Quantum tunneling 1,2‐H shift to the corresponding imine is thermodynamically favorable but does not occur due to a high‐energy barrier (~36 kcal mol−1).
Cláudio M. Nunes +5 more
wiley +1 more source
Scour‐Conditioned Seismic Fragility Analysis of Monopile‐Supported Offshore Wind Turbines
Earthquake Engineering &Structural Dynamics, Volume 55, Issue 4, Page 947-967, 10 April 2026.ABSTRACT Monopile‐supported offshore wind turbines (MS‐OWTs) are increasingly deployed in seismic coastal regions, where they face compound risks from earthquake loading and seabed scour. While past studies have addressed these hazards separately, seismic fragility under evolving scour conditions remains insufficiently understood. This study introduces
Francisco Pinto +3 more
wiley +1 more source
Precision slew/settle technologies for flexible spacecraft [PDF]
Many spacecraft missions in the next decade will require both a high degree of agility and precision pointing. Agility includes both rotational maneuvering for retargeting and translational motion for orbit adjustment and threat avoidance.
Manning, R. A., Spector, Victor A.
core +1 more source
Vestibular Evoked Myogenic Potentials to Diagnose Vestibular Neuritis: A Scoping Review
The Laryngoscope, Volume 136, Issue 4, Page 1635-1644, April 2026.Standardization of stimulation and recording protocols is essential to improve comparability across VEMP studies. Integrating cervical and ocular VEMPs with other vestibular tests enhances diagnostic accuracy and supports precise localization of vestibular neuritis.
Diego Piatti +5 more
wiley +1 more source
NASA/MSFC ground experiment for large space structure control verification [PDF]
Marshall Space Flight Center has developed a facility in which closed loop control of Large Space Structures (LSS) can be demonstrated and verified.
Seltzer, S. M. +2 more
core +1 more source
International Journal for Numerical and Analytical Methods in Geomechanics, Volume 50, Issue 5, Page 2648-2669, 10 April 2026.ABSTRACT This study presents large deformation computational methods to simulate lateral vehicular impacts on steel piles in granular soil. Soil‐mounted longitudinal barrier systems rely on energy dissipation in both the piles and the surrounding soil to safely redirect errant vehicles, so dynamic pile‐soil interaction is important for design ...
Tewodros Y. Yosef +6 more
wiley +1 more source
Kinetics of Elastic Recoil in the Wings of the cicada, Dundubia rufivena
Natural Sciences, Volume 6, Issue 2, April 2026.We quantify elastic recoil in cicada wings using high‐speed videography, revealing faster bending than torsional recoil. Wing stiffness increases when attached to the thorax, demonstrating a body‐wing spring system and highlighting that elastic recoil must be understood through whole‐organism mechanics rather than isolated wing properties.
Parvez Alam +5 more
wiley +1 more source
Analytical design and evaluation of an active control system for helicopter vibration reduction and gust response alleviation [PDF]
An analytical study was conducted to define the basic configuration of an active control system for helicopter vibration and gust response alleviation. The study culminated in a control system design which has two separate systems: narrow band loop for ...
Gold, P. +3 more
core +1 more source
European Journal of Organic Chemistry, Volume 29, Issue 9, 2 March 2026.The combination of Suzuki and Buchwald–Hartwig coupling in (pseudo‐)four‐component reactions paves an efficient one‐pot route to twisted, redox‐active triarylamine (TAA) emitters. Biaryl substitution patterns and para‐substituents serve as key levers for tuning redox potentials, as well as absorption and emission energies, complemented and, by time ...
Regina Kohlbecher +5 more
wiley +1 more source