Results 51 to 60 of about 219,678 (296)
Factors Impacting Chinese and European Vertical Fight Efficiency
Aerospace, 2022 Increasing complexity due to a constantly growing number of target functions turns air traffic trajectory optimization into a multidimensional and nonlinear task that in turn necessitates a focus on the case-sensitive most important criteria.
Judith Rosenow +3 more
doaj +1 more source
Control jet placement on spacecraft [PDF]
, 1969 For efficient operation and configuration design of multijet spacecraft control systems methods of linear programming are used to select combinations of individual jet-burn times which produce the desired impulses.
Crawford, B. S.
core +1 more source
Tuning Pore Size in Porous Graphene Membrane for O2/N2 Separation
Advanced Materials, EarlyView.Single‐layer graphene membranes featuring N‐functionalized, 0D pores offer a promising platform for O2/N2 separation. The heterogeneity of functional groups at the pore edge is dynamically tunable, enabling precise tuning of the pore limiting diameter and gas transport.
Kuang‐Jung Hsu +5 more
wiley +1 more source
Direct Ink Writing 3D Printing of Recyclable and Thermally Stable Vitrimers
Advanced Materials Technologies, EarlyView.Vitrimers hold great promise in additive manufacturing as defect‐insensitive, repairable, and recyclable feedstocks. A thin‐film additively manufactured process is developed for a high‐performance vitrimer that is difficult to process traditionally.
Louis O. Vaught +2 more
wiley +1 more source
Trajectory Optimization of Extended Formation Flights for Commercial Aviation
Aerospace, 2019 This paper presents a trajectory optimization study that has been conducted using a recently developed tool for the synthesis and analysis of extended flight formations of long-haul commercial aircraft, with the aim to minimize overall fuel consumption ...
Sander Hartjes +2 more
doaj +1 more source
Strategies for Choosing Descent Flight-Path Angles for Small Jets [PDF]
, 2012 Three candidate strategies for choosing the descent flight path angle (FPA) for small jets are proposed, analyzed, and compared for fuel efficiency under arrival metering conditions.
Green, Steven M., Wu, Minghong Gilbert
core +1 more source
Advanced Materials Technologies, EarlyView.Recent research on laser‐processed cermets and cemented carbides highlights significant advancements, yet a notable paucity of studies and persistent challenges remain. Efforts are increasingly focused on developing low‐cost, environmentally friendly cermets as alternatives to conventional materials.
Himanshu Singh Maurya +2 more
wiley +1 more source
Simulation studies of combustion in a constant-mass variable-volume combustion chamber [PDF]
FME Transactions, 2018 A numerical simulation code was used to conduct a systematic study of the effects of fuel-air equivalence ratios in the range 0.7 ≤ φ ≤ 1.4 and compression ratio, rc = 8.0 on key operating parameters, such as pressure, rate of change of pressure, '/dt ...
Anetor Lucky, Osakue Edward E.
doaj
A Commercial Aircraft Fuel Burn and Emissions Inventory for 2005–2011
Atmosphere, 2016 The commercial aircraft fuel burn and emission estimates of CO2, CO, H2O, hydrocarbons, NOx and SOx for 2005–2011 are given as the 4-D Aircraft Fuel Burn and Emissions Inventory.
Donata K. Wasiuk +3 more
doaj +1 more source
Advanced Photonics Research, EarlyView.This study investigates high‐efficiency double perovskite active layer (DPAL) structures using MAPbI3 and MASnI3 to surpass the Shockley‐Queisser limit in single‐junction perovskite solar cells. SCAPS‐1D simulations show that the V2O5‐assisted DPAL device achieves 34.14% power conversion efficiency with improved JSC, VOC, and FF.
Afifa Lubaba +7 more
wiley +1 more source