Results 101 to 110 of about 22,232 (271)

Effect of Radical Initiators on the Rheological Properties and Toughness of Poly(Lactic Acid)/Poly(3‐Hydroxybutyrate‐Co‐4‐Hydroxybutyrate) Blends

Polymer Engineering &Science, EarlyView.
Effect of mixing protocol on the size distribution of PHA domains in the PLA matrix. ABSTRACT In this study, poly(lactic acid) (PLA) and poly(3‐hydroxybutyrate‐co‐4‐hydroxybutyrate) [P(3HB‐4HB), a type of polyhydroxyalkanoate (PHA)], were melt‐blended at an 80/20 (wt/wt) ratio, and radical initiators were employed as reactive compatibilizers to enhance
Eunseol Kim, Hyungsu Kim
wiley   +1 more source

Green Maintenance Technology for Large Area Damage of Composite Tail Rotor Blade

Engineering Proceedings
Based on the analysis of the damage location, damage size, product layering structure, and internal filling structure of the composite tail rotor blade, the damage maintenance technical scheme was initially determined.
Miao Ren, Qidi Liu, Nan Lv, Lili Li
doaj   +1 more source

Synergistic Effects of Phenolic Resin and Polymer Architecture on Crosslink Density and Damping in Poly(Epichlorohydrin‐Co‐Ethylene Oxide‐Co‐Allyl Glycidyl Ether) (GECO) Elastomers

Journal of Polymer Science, EarlyView.
Phenolic resin reduces crosslink density and alters the viscoelastic response of GECO elastomers. The magnitude of these changes depends strongly on polymer architecture. Damping performance is governed by the combined effects of network density and molecular structure, not resin content alone, providing a framework for designing advanced vibration ...
Yalçın Yalaki, Murat Şen
wiley   +1 more source

Suggestions for unifying the parametrizations of turbulent orographic form drag, mountain wave drag, and flow blocking

Quarterly Journal of the Royal Meteorological Society, EarlyView.
A theory for the interaction between a boundary layer and a low mountain is used to provide estimates of the turbulent orographic form drag, upward‐propagating mountain gravity‐wave drag, and trapped lee‐wave drag (case shown in the figure). After reviewing briefly how these processes are represented in weather and climate models, we propose a ...
Francois Lott, Anton Beljaars, Bruno Deremble   +2 more
wiley   +1 more source

Acoustic wind tunnel tests on helicopter tail rotor noise (HeliNOVI) [PDF]

, 2008
In the framework of the European HeliNOVI project, an acoustic DNW wind tunnel study was conducted with respect to helicopter tail rotor noise. The goal of the tests was to investigate (1) the importance of tail rotor noise for different flight ...
van der Wall, Berend G., Oerlemans, Stefan, Yin, Jianping   +2 more
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Nonlinear Receding‐Horizon Differential Game for Drone Racing Along a Three‐Dimensional Path

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT Drone racing requires high‐speed navigation through three‐dimensional paths, posing significant challenges in control engineering. Existing control methods lack a feedback control framework that simultaneously addresses nonlinear drone dynamics and multi‐agent competitive interactions, such as overtaking or obstructing opponents.
Kijin Sung, Kenta Hoshino, Akihiko Honda, Takeya Shima, Toshiyuki Ohtsuka   +4 more
wiley   +1 more source

A study in the recovery method of the directional controllability of single-rotor helicopters under tail-rotor damage conditions by using main-rotor brakes and the dead zone/disturbance simultaneous estimator

Nihon Kikai Gakkai ronbunshu, 2015
This paper describes considerations of the effectiveness about the recovery control of the yaw rate motion of single-rotor helicopters by using both motors (engines) and main-rotor brakes in autorotation flight under tail-rotor damage conditions.
Daigo FUJIWARA
doaj   +1 more source

REPRESENTATIVE TEST RESULTS FROM HELINOVI AEROACOUSTIC MAIN ROTOR/TAIL ROTOR/FUSELAGE TEST IN DNW [PDF]

, 2005
In the framework of the European HeliNOVI project, an acoustic DNW wind tunnel study was conducted into helicopter tail rotor noise. The goal of the tests was to investigate (1) the importance of tail rotor noise for different flight conditions (2) main ...
van der Wall, Berend G., Oerlemans, Stefan, Yin, Jianping   +2 more
core  

Actuation Strategies for Underwater Jet‐Propelled Soft Robots

Journal of Field Robotics, EarlyView.
ABSTRACT This review article examines jet‐propulsion mechanisms in underwater soft robotic systems, focusing exclusively on physically fabricated and experimentally validated robots. Covering research published from 2013 to 2025, this study classifies and evaluates jet‐propulsion robots based on their actuation mechanisms.
Angel Kitone, Mohammed Anteet, Pawandeep S. Matharu, Yara Almubarak   +3 more
wiley   +1 more source

Development of a rotor model for the numerical simulation of helicopter exterior flow-fields [PDF]

, 2004
Includes bibliographical references (leaves 84-85).A numerical methodology is developed to model the effect of a rotor on the surrounding flow-field. The model calculates the time-averaged aerodynamic forces exerted on the air by the fan blades within ...
Hotchkiss, Paul
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