Results 131 to 140 of about 9,948,551 (358)
Stratospheric cruise emission reduction program [PDF]
, 1977 A recently implemented NASA effort specifically aimed at reducing cruise oxides of nitrogen from high-altitude aircraft is discussed. The desired emission levels and the combustor technology required to achieve them are discussed. A brief overview of the
Diehl, L. A. +3 more
core +1 more source
The Origin of Efficiency in III‐Nitride Micro‐Light‐Emitting Diodes
Advanced Science, EarlyView.The images show panchromatic cathodoluminescence of III‐V materials, which reveal that AlGaInP red wafers, having fewer defects, support longer carrier diffusion lengths. Meanwhile, the density of defects increases with longer emission wavelengths in the InGaN system, illustrating how generated carriers pass through the material and how defects limit ...
Jeong‐Hwan Park +11 more
wiley +1 more source
Investigation of critical burning of fuel droplets [PDF]
The steady combustion characteristics of droplets were considered in combustion chamber environments at various pressures, flow conditions, and ambient oxidizer concentrations for a number of hydrocarbon fuels.
Chanin, S., Faeth, G. M.
core +1 more source
Effect of air-preheating on NOx emissions from a gas turbine combustor [PDF]
, 1994 A 76 mm diameter can combustor equipped with a 45° curved-blade radial swirler was used to study the effect of high inlet temperature gas turbine combustion on NOx emission characteristics.
Mustafa, Azeman
core
Advanced Science, EarlyView.This work demonstrates a phase‐engineered MoS2 photodetector that dynamically switches among photocapacitive (PCC), photovoltaic (PV), and photoconductive (PC) modes. By transforming the traditionally parasitic capacitance into an active signal source, the device achieves self‐powered, high‐sensitivity detection with a fast response of 19.2 ms, and a ...
Xinyu Li +16 more
wiley +1 more source
Further experimental results on the structure and acoustics of turbulent jet flames [PDF]
, 1975 The structure of open turbulent jet flames is experimentally studied in the context of their noise emission characteristics. The differences between premixed and (co-flow) non-premixed flames are explored.
Kumar, R. N.
core
Nickel‐Catalyzed Twofold Conjunctive Coupling via Philicity‐Alternating Radical Relay
Advanced Science, EarlyView.Herein, we disclose a nickel‐catalyzed twofold conjunctive coupling that enables a four‐component assembly involving an activated alkene, a 1,3‐enyne, and both alkyl and aryl halides. Multiple C–C bonds are selectively constructed through a philicity‐alternating radical relay and the selective radical capture by the nickel catalyst.
Ji Hwan Jeon +7 more
wiley +1 more source
Atomic Tuning of Metal‐Support Interactions for Pathway‐Selective CO2 Photoreduction on TiO2
Advanced Science, EarlyView.Single‐atom Fe and Cu catalysts anchored on TiO2 steer photocatalytic CO2 reduction toward distinct pathways. Fe sites favor rapid *CO desorption and selective CO formation, whereas Cu sites stabilize *CHO intermediates, enabling deep reduction and C─C coupling. Combined spectroscopy and DFT calculations reveal how metal–support interactions and oxygen
Dongyun Kim +13 more
wiley +1 more source
Diffusion flame extinction in slow convenctive flow under microgravity environment [PDF]
A theoretical analysis is presented to study the extinction characteristics of a diffusion flame near the leading edge of a thin fuel plate in slow, forced convective flows in a microgravity environment.
Chen, C. H.
core +1 more source
Results of 1/4-Scale Experiments. Vapor Simulant And Liquid Jet A Tests [PDF]
, 2000 A quarter-scale engineering model of the center wing tank (CWT) of a 747-100 was constructed. This engineering model replicated the compartmentalization, passageways, and venting to the atmosphere.
Birky, M. M. +6 more
core