Results 71 to 80 of about 63,330 (315)
Cam-Operated Pitch-Change Apparatus [PDF]
, 1978 A pitch-change apparatus for a ducted thrust fan having a plurality of variable pitch blades employs a camming ring mounted coaxially at the hub at an axially fixed station along the hub axis for rotation about the hub axis both with the blades and ...
Barnes, P. E.
core +1 more source
The Anatomical Record, EarlyView.Abstract Despite documented ecomorphological shifts toward an herbivorous diet in several coelurosaurian lineages, the evolutionary tempo and mode of these changes remain poorly understood, hampered by sparse cranial materials for early representatives of major clades. This is particularly true for Therizinosauria, with representative crania best known
William J. Freimuth, Lindsay E. Zanno
wiley +1 more source
Research on the Aerodynamic–Propulsion Coupling Characteristics of a Distributed Propulsion System
Applied SciencesIn recent years, the distributed propulsion system has received extensive attention due to its advantages such as high propulsion efficiency, low noise, high safety redundancy, and good flexibility and maneuverability.
Xiaojun Yang, Tao Liu, Wei Jia
doaj +1 more source
Propulsion airframe integration [PDF]
Wind tunnel simulation tests are reported that utilize a 20 inch powered nacelle for airframe integration studies. Considered are: effects of boattail positioning, nacelle size, aft fuselage drag, over-the-wing half span model installation, and turboprop
Mikkelson, D.
core +1 more source
Ducted Fan Shape Optimization Based CFD Code [PDF]
, 2015 Bakalářská práce identifikuje tvarové parametry sacího kanálu, které ovlivňují průtok sacím kanálem. Pomocí numerické simulace zkoumá a vyhodnocuje charakteristiky a proudové pole řešených sacích kanálů.Bachelor Thesis determines shape parameters of a ...
Devera Jakub
core
The Anatomical Record, EarlyView.Abstract The upper carbonate concretion levels of the Romualdo Formation (Aptian, Brazil) have yielded several theropod dinosaur remains, including spinosaurids and the coelurosaurs Santanaraptor placidus and Mirischia asymmetrica, the phylogenetic affinities of which are controversial.
Rafael Delcourt +4 more
wiley +1 more source
On dynamic characteristics and stability analysis of the ducted fan unmanned aerial vehicles
International Journal of Advanced Robotic Systems, 2019 This article researches the improvement of dynamics stability of the ducted fan unmanned aerial vehicles by optimizing its mechanical–structure parameters.
Cheng Chen +3 more
doaj +1 more source
, 2012 published_or_final_version ; Mechanical Engineering ; Master ; Master of ...
openaire +2 more sources
Comparison of Far-Field Noise for Three Significantly Different Model Turbofans [PDF]
, 2008 Far-field noise sound power level (PWL) spectra and overall sound pressure level (OASPL) directivities were compared for three significantly different model fan stages which were tested in the NASA Glenn 9x15 Low Speed Wind Tunnel. The test fans included
Woodward, Richard P.
core +2 more sources
The Anatomical Record, EarlyView.Abstract The Upper Cretaceous São José do Rio Preto Formation (Bauru Group, southeastern Brazil) has yielded a fragmentary but taxonomically diverse record of titanosaur sauropods, although elements from cervical series remain scarce. Here, we describe a nearly complete sauropod axis from the Vila Ventura Paleontological Area, representing an uncommon ...
Bruno A. Navarro +7 more
wiley +1 more source