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  • Acoustics  (11)
  • MATERIALS, METALLIC  (7)
  • Fluid Mechanics and Thermodynamics  (5)
  • Nonlinear Dynamics, Fluid Dynamics, Classical Optics, etc.  (5)
  • 1
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    Improved Intrapulse Raman Scattering Control via Asymmetric Airy Pulses (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-02-21
    Description: Author(s): Yi Hu, Amirhossein Tehranchi, Stefan Wabnitz, Raman Kashyap, Zhigang Chen, and Roberto Morandotti We experimentally demonstrate the possibility of tuning the frequency of a laser pulse via the use of an Airy pulse-seeded soliton self-frequency shift. The intrinsically asymmetric nature of Airy pulses, typically featured by either leading or trailing oscillatory tails (relatively to the main lobe... [Phys. Rev. Lett. 114, 073901] Published Fri Feb 20, 2015
    Keywords: Nonlinear Dynamics, Fluid Dynamics, Classical Optics, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Exceptional Contours and Band Structure Design in Parity-Time Symmetric Photonic Crystals (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-05-21
    Description: Author(s): Alexander Cerjan, Aaswath Raman, and Shanhui Fan We investigate the properties of two-dimensional parity-time symmetric periodic systems whose non-Hermitian periodicity is an integer multiple of the underlying Hermitian system’s periodicity. This creates a natural set of degeneracies that can undergo thresholdless P T transitions. We derive a k · p p… [Phys. Rev. Lett. 116, 203902] Published Fri May 20, 2016
    Keywords: Nonlinear Dynamics, Fluid Dynamics, Classical Optics, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Upper Bound on the Modal Material Loss Rate in Plasmonic and Metamaterial Systems (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-04-30
    Description: Author(s): Aaswath Raman, Wonseok Shin, and Shanhui Fan A better understanding of optical loss in plasmonic and metamaterial systems is of increasing importance for both basic and applied research in a broad range of topics including sensors, antennas, optical interconnects, and photovoltaics. In this Letter, we use a photonic band formalism for plasmoni... [Phys. Rev. Lett. 110, 183901] Published Mon Apr 29, 2013
    Keywords: Nonlinear Dynamics, Fluid Dynamics, Classical Optics, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Microscopic Marangoni Flows Cannot Be Predicted on the Basis of Pressure Gradients (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-11-30
    Description: Author(s): Yawei Liu, Raman Ganti, Hugh G. A. Burton, Xianren Zhang, Wenchuan Wang, and Daan Frenkel A concentration gradient along a fluid-fluid interface can cause flow. On a microscopic level, this so-called Marangoni effect can be viewed as being caused by a gradient in the pressures acting on the fluid elements or as the chemical-potential gradients acting on the excess densities of different ... [Phys. Rev. Lett. 119, 224502] Published Wed Nov 29, 2017
    Keywords: Nonlinear Dynamics, Fluid Dynamics, Classical Optics, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Thermodynamic Upper Bound on Broadband Light Coupling with Photonic Structures (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-10-24
    Description: Author(s): Zongfu Yu, Aaswath Raman, and Shanhui Fan The coupling between free space radiation and optical media critically influences the performance of optical devices. We show that, for any given photonic structure, the sum of the external coupling rates for all its optical modes are subject to an upper bound dictated by the second law of thermodyn... [Phys. Rev. Lett. 109, 173901] Published Tue Oct 23, 2012
    Keywords: Nonlinear Dynamics, Fluid Dynamics, Classical Optics, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Reversal in Spreading of a Tabbed Circular Jet Under Controlled Excitation (1997)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Detailed flow field measurements have been carried out for a turbulent circular jet perturbed by tabs and artificial excitation. Two "delta tabs" were placed at the nozzle exit at diametricall opposite y locations. The excitation condition involved subharmonic resonance that manifested in a periodic vortex pairing in the near flow field. While the excitation and the tabs independently increased jet spreading, a combination of the two diminished the effect. The jet spreading was most pronounced with the tabs but was reduced when excitation was applied to the tabbed jet. The tabs generated streamwise vortex pairs that caused a lateral spreading of the jet in a direction perpendicular to the plane containing the tabs. ne excitation, on the other hand, organized the azimuthal vorticity into coherent ring structures whose evolution and pairing also increased entrainment by the jet. In the tabbed case, the excitation produced coherent azimuthal structures that were distorted and asymmetric in shape. The self-induction of these structures produced an effect that opposed the tendency for the lateral spreading of the streamwise vortex pairs. The passage of the distorted vortices, and their pairing, also had a cancellation effect on the time-averaged streamwise vorticity field. These led to the reduction in jet spreading.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: Physics of Fluids; Volume 9; No. 12; 3733-3741
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    NASA TECHNICAL REPORTS
  • 7
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    Investigations of High Pressure Acoustic Waves in Resonators with Seal-Like Features (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: 1) Standing waves with maximum pressures of 188 kPa have been produced in resonators containing ambient pressure air; 2) Addition of structures inside the resonator shifts the fundamental frequency and decreases the amplitude of the generated pressure waves; 3) Addition of holes to the resonator does reduce the magnitude of the acoustic waves produced, but their addition does not prohibit the generation of large magnitude non-linear standing waves; 4) The feasibility of reducing leakage using non-linear acoustics has been confirmed.
    Keywords: Acoustics
    Type: 2003 NASA Seal/Secondary Air System Workshop, Volume 1; 239-271; NASA/CP-2004-212963/VOL1
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  • 8
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    Effect of Forcing Function on Nonlinear Acoustic Standing Waves (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Nonlinear acoustic standing waves of high amplitude have been demonstrated by utilizing the effects of resonator shape to prevent the pressure waves from entering saturation. Experimentally, nonlinear acoustic standing waves have been generated by shaking an entire resonating cavity. While this promotes more efficient energy transfer than a piston-driven resonator, it also introduces complicated structural dynamics into the system. Experiments have shown that these dynamics result in resonator forcing functions comprised of a sum of several Fourier modes. However, previous numerical studies of the acoustics generated within the resonator assumed simple sinusoidal waves as the driving force. Using a previously developed numerical code, this paper demonstrates the effects of using a forcing function constructed with a series of harmonic sinusoidal waves on resonating cavities. From these results, a method will be demonstrated which allows the direct numerical analysis of experimentally generated nonlinear acoustic waves in resonators driven by harmonic forcing functions.
    Keywords: Acoustics
    Type: Paper 4aPAa2 , 145th Acoustic Society of America Conference; Apr 28, 2003 - May 02, 2003; Nashville, TN; United States
    Format: text
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  • 9
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    Screech Tones of Supersonic Jets from Bevelled Rectangular Nozzles (1997)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: It is known experimentally that an imperfectly expanded rectangular jet from a thin-lip convergent nozzle emits only a single dominant screech tone. The frequency of the screech tone decreases continuously with increase in jet Mach number. However, for a supersonic jet issued from a bevelled nozzle or a convergent-divergent nozzle with straight side walls, the shock cell structure and the screech frequency pattern are fairly complicated and have not been predicted before. In this paper, it is shown that the shock cell structures of these jets can be decomposed into waveguide modes of the jet flow. The screech frequencies are related to the higher-order waveguide modes following the weakest-link screech tone theory. The measured screech frequencies are found to compare well with the predicted screech frequency curves.
    Keywords: Acoustics
    Type: NASA-CR-205131 , AIAA Paper 95-0143 , NAS 1.26:205131 , Aerospace Sciences Meeting & Exhibit; Jan 06, 1997 - Jan 10, 1997; Reno, NV; United States
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  • 10
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    Crystal structures of AB sub 3 and A sub 2 B sub 7 rare earth-nickel phases. (1969)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Crystal structures of Ni-rich rare earth/Ni phases, including high temperature forms
    Keywords: MATERIALS, METALLIC
    Type: ; ADEMIE DES SCIENCES
    Format: text
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