Results 101 to 110 of about 847,370 (336)
Engine/airframe interface dynamics experience [PDF]
Problems of engine/drive system torsional stability, engine and output shaft critical speeds, and engine vibration at helicopter rotor order frequencies are discussed, and test data and analyses presented.
Fredrickson, C.
core +1 more source
Steering Digital Transformation: An Iterative Landscape Approach
Information Systems Journal, EarlyView.ABSTRACT Digital transformation (DT) is in the limelight of organisations and society. However, it is challenging to steer a DT endeavour, which is also difficult to assess because of its complex nature. Instead of focusing solely on the typical end result of DT, we propose using a DT landscape approach.
Léon‐Paul de Rouw +3 more
wiley +1 more source
Helicopter far-field acoustic levels as a function of reduced main-rotor advancing blade-tip Mach number [PDF]
During the design of a helicopter, the weight, engine, rotor speed, and rotor geometry are given significant attention when considering the specific operations for which the helicopter will be used. However, the noise radiated from the helicopter and its
Lemasurier, Philip +2 more
core +1 more source
Journal of Agrarian Change, EarlyView.ABSTRACT So‐called surplus populations have repeatedly been the focus of critical analyses in recent years. This refers to a large social group that comprises most of the population in the Global South and is characterised by the fact that it is not integrated into the capitalist mode of production to any relevant extent through wage labour.
Jakob Graf
wiley +1 more source
SIMULATION AND OPTIMIZATION OF ULTRALIGHT HELICOPTER AERODYNAMIC CHARACTERISTICS
Advanced Engineering Research, 2012 The simulation and optimization of the ultralight helicopter aerodynamic characteristics at the design stages and phases which permit to determine optimal values of the engine power and speed are performed.
Viktor P. Zharov, Sergey P. Lisin
doaj
A helicopter handling-qualities study of the effects of engine response characteristics, height-control dynamics, and excess power on nap-of-the-Earth operations [PDF]
The helicopter configuration with an rpm-governed gas-turbine engine was examined. A wide range of engine response time, vehicle damping and sensitivity, and excess power levels was studied.
Corliss, L. D.
core +1 more source
New Phytologist, EarlyView.Summary Chloroplast‐to‐nucleus retrograde signalling enables rapid stress responses in plants, but whether these signals accumulate to affect crop performance across entire growing seasons under field conditions remains unknown. We generated wheat mutants with targeted deletions in specific SAL gene copies from two distinct homeologous groups (TaSAL1 ...
Andrew F. Bowerman +13 more
wiley +1 more source
Compound cycle engine for helicopter application [PDF]
The compound cycle engine (CCE) is a highly turbocharged, power-compounded, ultra-high-power-density, lightweight diesel engine. The turbomachinery is similar to a moderate-pressure-ratio, free-power-turbine gas turbine engine and the diesel core is high
Bradley, Curtiss +2 more
core +1 more source
Risk Analysis, EarlyView.Abstract The transition from one level of operations to a next larger, more complex level while maintaining coherence as a system has stymied organizational theorists for decades. Drawing on systems theory, network analysis, and collaborative governance, we explore how networks adapt during rapidly escalating crises.
Louise Comfort, Saemi Chang
wiley +1 more source
SIMULATION AND OPTIMIZATION OF ULTRALIGHT HELICOPTER AERODYNAMIC CHARACTERISTICS
Вестник Донского государственного технического университета, 2018 The simulation and optimization of the ultralight helicopter aerodynamic characteristics at the design stages and phases which permit to determine optimal values of the engine power and speed are performed.
Viktor P. Zharov, Sergey P. Lisin
doaj