Institution
Langley Research Center
Facility•Hampton, Virginia, United States•
About: Langley Research Center is a facility organization based out in Hampton, Virginia, United States. It is known for research contribution in the topics: Mach number & Wind tunnel. The organization has 15945 authors who have published 37602 publications receiving 821623 citations. The organization is also known as: NASA Langley & NASA Langley Research Center.
Topics: Mach number, Wind tunnel, Aerodynamics, Boundary layer, Supersonic speed
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, the authors presented a new methodology to measure the crack resistance curves associated with fiberdominated failure modes in polymer-matrix composites, which is based on the identification of the crack tip location using Digital Image Correlation and the calculation of the J-integral directly from the test data using a simple expression derived for cross-ply composite laminates.
175 citations
TL;DR: In this paper, the adsorbed single walled carbon nanotubes (SWNTs) were shown to be mostly in the form of 5−10 nm bundles and that uniform substrate coverage occurred.
Abstract: Polymer/carbon nanotube films have been formed by the alternate adsorption of the polyelectrolyte poly(diallyldimethylammonium chloride) and single walled carbon nanotubes (SWNT) onto substrates. Atomic force and scanning electron microscopies indicated that the adsorbed SWNTs were mostly in the form of 5−10 nm bundles and that uniform substrate coverage occurred. Absorbance spectrophotometry (UV−vis−NIR) confirmed that the adsorption technique resulted in uniform film growth. Characterization of the adsorbed SWNTs by X-ray photoelectron, Raman, and UV−vis−NIR spectroscopies suggested that they have a core of well ordered nanotubes covered by a layer of oxidized carbon nanotubes.
175 citations
TL;DR: An implicit algorithm for solving the discrete adjoint system based on an unstructured-grid discretization of the Navier–Stokes equations is presented, constructed such that an adjoint solution exactly dual to a direct differentiation approach is recovered at each time step, yielding a convergence rate which is asymptotically equivalent to that of the primal system.
174 citations
TL;DR: The results of one Martian year of radio occultation measurements of the atmosphere and topography of Mars obtained using the Viking Orbiters are briefly summarized in this article, where the vertical distribution of tropospheric gas refractivity and ionospheric electron density obtained from atmospheric Doppler frequency perturbations of the S and X band radio tracking frequencies indicate large meteorological variations, with near-surface temperatures ranging from 150 to 250 K, 5-km atmospheric pressure ranging from 3.5 to 4.8 mbar.
Abstract: The results of one Martian year of radio occultation measurements of the atmosphere and topography of Mars obtained using the Viking Orbiters are briefly summarized. Determinations of the vertical distribution of tropospheric gas refractivity and ionospheric electron density obtained from atmospheric Doppler frequency perturbations of the S and X band radio tracking frequencies indicate large meteorological variations, with near-surface temperatures ranging from 150 to 250 K, 5-km atmospheric pressure ranging from 3.5 to 4.8 mbar, inversion layers over the polar caps and dust storms, and seasonal pressure variations. Double- and single-layered upper atmospheric electron density profiles were observed on the sunlit and dark sides of the planet, respectively. A topographic map of the Martian surface, obtained from the limb diffraction effects observed at ingress and egress, is found to agree well with the elevation contours of US Geological survey map M 25M 3 RMC, with the exception of the south polar and Alba Patera regions.
174 citations
TL;DR: In this article, a prototype GPS bistatic radar participated in airborne measurements during the Soil Moisture Experiment 2002 (SMEX02) and was mounted on the NCAR C-130 aircraft to make co-located measurements with other instruments.
174 citations
Authors
Showing all 16015 results
| Name | H-index | Papers | Citations |
|---|---|---|---|
| Daniel J. Jacob | 162 | 656 | 76530 |
| Donald R. Blake | 118 | 727 | 49697 |
| Veerabhadran Ramanathan | 100 | 301 | 47561 |
| Raja Parasuraman | 91 | 402 | 41455 |
| Robert W. Platt | 88 | 638 | 31918 |
| James M. Russell | 87 | 691 | 29383 |
| Daniel J. Inman | 83 | 918 | 37920 |
| Antony Jameson | 79 | 474 | 31518 |
| Ya-Ping Sun | 79 | 277 | 28722 |
| Patrick M. Crill | 79 | 228 | 20850 |
| Richard B. Miles | 78 | 759 | 25239 |
| Patrick Minnis | 77 | 490 | 23403 |
| Robert W. Talbot | 77 | 297 | 19783 |
| Raphael T. Haftka | 76 | 773 | 28111 |
| Jack E. Dibb | 75 | 344 | 18399 |