Results 91 to 100 of about 1,137,089 (312)

Helicopter simulation validation using flight data [PDF]

A joint NASA/Army effort to perform a systematic ground-based piloted simulation validation assessment is described. The best available mathematical model for the subject helicopter (UH-60A Black Hawk) was programmed for real-time operation.
Abbott, W. Y., Cleveland, W. B., Hansen, R. S., Key, D. L.   +3 more
core   +1 more source

Shape‐Controlled Guanine Self‐Assemblies for Stable and Fast‐Ion Solid–Electrolyte Interphases in Sustainable Li Metal Batteries

Advanced Functional Materials, EarlyView.
The shape of guanine self‐assemblies is tuned by introducing alkyl (G8), fluoroalkyl (G8f), and oligoether (G8g) side chains into the G moiety. The scanning tunneling microscopy results and calculations show that the presence and type of the side chain strongly affect the G self‐assembly network.
So‐Huei Kang, So‐Dam Sohn, Kyung Min Lee, Seok‐Kyu Cho, Byongkyu Lee, Ji Eun Lee, Sang‐Young Lee, Sang Kyu Kwak, Hyung‐Joon Shin, Changduk Yang   +9 more
wiley   +1 more source

UH-60A Airloads Flight Test Program: Data Counter 8513 [PDF]

The data collection portion of the UH-60A Airloads Flight Test Program was conducted between July 1993 and February 1994. At the time, the UH-60A Airloads Program was the most comprehensive and data-rich rotorcraft flight test program that NASA and the U.
Dominguez, Michelle, Dromiack, Hannah, Kufeld, Robert M., Romander, Ethan A.   +3 more
core   +1 more source

Structure Formation in Butterfly Scales: Interplay of Genetic Control, Mechanical Instabilities, and Dynamic Material Properties

Advanced Functional Materials, EarlyView.
Butterfly wing scales are intricate cuticular functional nanosctructures. This perspective suggests that spatially varying material properties, cytoskeletal constraints, and growth‐driven mechanical instabilities shape the resulting nanoscale architectures created from single cells.
Anupama Prakash, Victoria Lloyd, Yi Yang, Anna‐Lee Jessop, Anthony McDougal, Primož Pirih, Guillaume Duclos, Andrew Parnell, Mathias Kolle, Nicola J. Nadeau, Bodo D. Wilts   +10 more
wiley   +1 more source

The future intensification of hydrological extremes and whiplashes in the contiguous United States increase community vulnerability

Communications Earth & Environment
Hydroclimatic whiplash rapid shifts between drought and flood poses growing risks to U.S. communities. Here, we assess historical extremes and future projections using a normalized streamflow metric: the annual mean flow’s deviation from the 1981–2020 ...
Surendra Maharjan, Wenzhao Li, John D. Bolten, Hesham El-Askary   +3 more
doaj   +1 more source

D-Vine-Based Correction of Physics-Based Model Output for the Identification of Risky Flights With Respect to Runway Overruns

IEEE Access
Flight dynamic-based physical models are employed to assess the risk of runway overruns, predicting risk based on the metric given by the distance to a controllable speed of 80 knots after landing.
Hassan Alnasser, Marco Pfahler, Ariane Hanebeck, Lukas Beller, Claudia Czado   +4 more
doaj   +1 more source

Omega flight-test data reduction sequence [PDF]

Computer programs for Omega data conversion, summary, and preparation for distribution are presented. Program logic and sample data formats are included, along with operational instructions for each program.
Lilley, R. W.
core   +1 more source

Furan‐Substituted Phosphine‐Oxide as an Efficient Interfacial Modifier for Wide‐Bandgap Perovskite Solar Cells

Advanced Functional Materials, EarlyView.
We report phosphine‐oxide interlayers for wide‐bandgap perovskite solar cells, in which tuned P = O Lewis basicity enables selective passivation of buried NiOx/perovskite interfaces and introduces interfacial dipoles that strengthen the built‐in field.
JeeHee Hong, Juan Anthony Prayogo, Soobin Heo, Jae Sung Yun, Dong Ryeol Whang, Dong Wook Chang, Hui Joon Park   +6 more
wiley   +1 more source

Data-Efficient Reinforcement Learning Framework for Autonomous Flight Based on Real-World Flight Data

Drones
Recently, autonomous flight has emerged as a key technology in the aerospace and defense sectors; however, traditional code-based autonomous flight systems face limitations in complex environments.
Uicheon Lee, Seonah Lee, Kyonghoon Kim
doaj   +1 more source

Post Flight Dynamic Analysis Simulation [PDF]

, 1970
Digital six-degrees-of-freedom, open loop Saturn 5 first stage flight evaluation simulation program obtains post flight simulation of the launch vehicle using actual flight data as input. Results are compared with measured data.
Gregory, B. R.
core   +1 more source