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  • Comparative Studies. Non-European Languages/Literatures  (8)
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  • Comparative Studies. Non-European Languages/Literatures  (8)
RVK
  • 1
    Online Resource
    Online Resource
    Numerical simulation of superoscillations of a BSA-bearing drop in microgravity
    Acoustical Society of America (ASA) ; 1997
    In:  The Journal of the Acoustical Society of America Vol. 102, No. 5_Supplement ( 1997-11-01), p. 3185-3185
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 102, No. 5_Supplement ( 1997-11-01), p. 3185-3185
    Abstract: Large-amplitude nonlinear oscillations of a water drop, radius 2.53 cm and aspect ratio 2.10, with surfactant BSA (bovine serum albumin) 1.0×10−5 g/ml(1CMC), is numerically simulated based on the boundary integral method. BSA is a globular, large molecular-weight protein. Two surface viscosities, surface dilatational viscosity and surface shear viscosity, as well as the Marangoni effect, are considered. The high-surface viscosities make the rotational velocity the same order as the irrotational velocity in the boundary layer. A boundary-layer method is used to calculate the rotational velocity. When the surface dilatational viscosity is 0.5 sp and the surface shear viscosity is 0.15 sp, the numerical simulation results are in good agreement with the experiment results observed in the space shuttle during the second United States Microgravity Laboratory, USML-2, in October, 1995. The evolution of the drop oscillation for both experiment and simulation is given. The change of the BSA distribution along the surface, and the relative importance of the rotational and irrotational velocities, as the drop oscillates is also shown. [Work supported by NASA through JPL, Contract No. 958722.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.420854
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1997
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    Surfactant-bearing drop dynamics in microgravity
    Acoustical Society of America (ASA) ; 1998
    In:  The Journal of the Acoustical Society of America Vol. 103, No. 5_Supplement ( 1998-05-01), p. 2764-2764
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 103, No. 5_Supplement ( 1998-05-01), p. 2764-2764
    Abstract: Experiments of large amplitude nonlinear oscillations of axially symmetric surfactant-bearing (triton or bovine serum albumin) water drops with different initial aspect ratios and drop volumes were performed during the second United States Microgravity Laboratory, USML-2 in November 1995. Through the numerical simulation of the oscillations of these surfactant-bearing water drops using the boundary integral method, the surface dilatational viscosity and the surface shear viscosity are found to play a major role in these oscillations. How they influence the damping coefficient and the drop oscillation frequency will be presented. The numerical and analytical results and a physical picture of the relation between the surface viscosities and the damping coefficient will be described. In addition, the relation between the initial drop aspect ratio, the surface viscosities, and the surface rotational velocity will also be presented. [Work supported by NASA through JPL, Contract No. 958722.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.421428
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1998
    detail.hit.zdb_id: 1461063-2
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Nonlinear dynamics of bubbles with surfactants
    Acoustical Society of America (ASA) ; 1998
    In:  The Journal of the Acoustical Society of America Vol. 103, No. 5_Supplement ( 1998-05-01), p. 3012-3013
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 103, No. 5_Supplement ( 1998-05-01), p. 3012-3013
    Abstract: Hugh Flynn pioneered many aspects of cavitational phenomena. He even got a patent on the idea that large bubble collapse could be used for inertially induced thermonuclear fusion. Some researchers currently working in the area of sonoluminescence are asking the same questions. One of the key requirements for confining the energy in the collapse of a bubble is maintaining spherical symmetry. Instabilities, such as Rayleigh–Taylor and Kelvin–Helmholtz, can compromise this requirement. Therefore it is useful to examine the role of surfactants in conferring stability on the collapse of bubbles. Codes that have recently permitted the description of superoscillations of liquid drops with surfactants in air [e.g., Apfel et al., Phys. Rev. Lett. 78, 1912–1915 (1997)] can be applied to the case of a bubble in a liquid. Of particular interest are insoluble surfactants, such as bovine serum albumin, which do not reduce the surface tension that much, but which greatly increase the surface damping. The role of damping in discouraging or delaying instability of collapsing bubbles in an acoustic field will be presented. [Work supported in part by NASA through Contract No. 958722 managed by the Jet Propulsion Laboratory.]  
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.422484
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1998
    detail.hit.zdb_id: 1461063-2
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Non-reciprocal sound propagation using acoustic resonators via space-time modulation
    Acoustical Society of America (ASA) ; 2019
    In:  The Journal of the Acoustical Society of America Vol. 145, No. 3_Supplement ( 2019-03-01), p. 1687-1687
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 145, No. 3_Supplement ( 2019-03-01), p. 1687-1687
    Abstract: Breaking reciprocity is of fundamental importance in communication and signal processing and is less explored in the field of acoustics. Here, we show that non-reciprocal acoustic transmission can be realized in cascaded resonators that are periodically modulated. In the continuum limit, we also study the sound propagation in a continuously modulated effective medium. Functionalities such as mode conversion, parametric amplification, and phase conjugation are demonstrated. Finite-difference time-domain (FDTD) simulations are carried out to verify the results. An experimental platform is constructed which is composed of a waveguide system with side-loaded resonators. The back walls of the resonators are driven dynamically using speakers so that time modulation can be achieved.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.5101183
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2019
    detail.hit.zdb_id: 1461063-2
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  • 5
    Online Resource
    Online Resource
    Oscillations of a water drop with surfactant Triton X-100 in zero gravity
    Acoustical Society of America (ASA) ; 1997
    In:  The Journal of the Acoustical Society of America Vol. 101, No. 5_Supplement ( 1997-05-01), p. 3058-3059
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 101, No. 5_Supplement ( 1997-05-01), p. 3058-3059
    Abstract: Large amplitude nonlinear oscillations of an axially symmetric water drop of 2.51-cm diameter, initial aspect ratio 3.4, with surfactant Triton X-100 of 0.5 mM, in zero gravity are studied by a boundary element method. Included in the analysis are surface-shear and dilatational viscos- ity, under the assumption that the shear viscosity of the bulk phase is small. Numerical simulations of the drop oscillations are in good agreement with the experimental results of drop oscillations measured in space during the second United States Microgravity Laboratory, USML-2. The evolution of the drop oscillations for both experiment and simulation is given. The simulation provides predictions for the values of both surface dilatational viscosity and shear viscosity of 0.20 sp and 0.10 sp, respectively. In addition, with the simulated data, the damping constants, frequencies, and decomposed oscillation modes are computed. [Work supported by NASA through JPL, Contract No. 958722.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.418715
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1997
    detail.hit.zdb_id: 1461063-2
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  • 6
    Online Resource
    Online Resource
    Transitioning From Master's Studies to the Classroom: From Theory to Practice
    Wiley ; 2019
    In:  TESOL Quarterly Vol. 53, No. 3 ( 2019-09), p. 685-711
    Details
    In: TESOL Quarterly, Wiley, Vol. 53, No. 3 ( 2019-09), p. 685-711
    Abstract: The importance of social interaction in a community of practice for promoting effective teacher learning is well established (Johnson & Golombek, 2011; Lave & Wenger, 1991). Research outlines the challenges language teachers experience in transitioning between teacher education programmes and the classroom, particularly regarding the theory–practice nexus, and emphasizes the professional community's key role in providing mentoring and support. In this regard, language teachers’ experiences in transitioning from theoretically oriented language education master's programmes to the language classroom are underresearched. This study reports data gathered from 21 mainland Chinese participants transitioning from master's programmes in three locations (Hong Kong, Scotland, and China) to language classrooms in China. In line with other research on teacher education programmes, this study's findings suggest interesting common experiences among these new teachers regardless of the context where their studies took place, including a sense of isolation, a “sink‐or‐swim” phenomenon leading to the abandonment of theoretically grounded pedagogical beliefs in exchange for adherence to “safe” practice, confusion regarding the relationship between learning on university programmes and the practice of teaching, and weak self‐efficacy as transitioning teachers face internal and external pressures. Implications and consequences are discussed in the context of the theory–practice nexus.
    Type of Medium: Online Resource
    ISSN: 0039-8322 , 1545-7249
    URL: Issue
    URL: Article
    DOI: 10.1002/tesq.v53.3
    DOI: 10.1002/tesq.505
    RVK:
    EQ 1000
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2115547-1
    SSG: 5,3
    SSG: 7,24
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Feasibility of low-frequency single-bubble sonolumin- escence
    Acoustical Society of America (ASA) ; 1995
    In:  The Journal of the Acoustical Society of America Vol. 97, No. 5_Supplement ( 1995-05-01), p. 3411-3411
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 97, No. 5_Supplement ( 1995-05-01), p. 3411-3411
    Abstract: The potential to perform single-bubble sonoluminescence (SBSL) at low frequencies is motivated by the payoff of greatly enhanced energy concentration during collapse. Yet it is also known that bubbles undergoing such catastrophic collapse tend to be unstable. Experimental apparatus has been designed and computer simulations have been performed to test the feasibility of low-frequency, single-bubble sonoluminescence. The experimental apparatus consists of a cylindrical cell that is driven by an aluminum, half-wavelength resonator with fundamental resonance of less than 15 kHz. The cell is designed to be pressurized up to 5 atmospheres to allow levitation without significant spurious cavitation in the liquid. To complement this experimental work, our computer simulations of this phenomena are continuing [T. Shi and R. Apfel, 3253 (1994)] in order to follow the shape distortion of collapsing bubbles for varying parameters, including acoustic frequency. The basic characteristics of our low-frequency resonator and the results of experimental work and computer simulations will be reported.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.412491
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1995
    detail.hit.zdb_id: 1461063-2
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  • 8
    Online Resource
    Online Resource
    Theoretical analysis of free-shape oscillations of surfactant-bearing drops
    Acoustical Society of America (ASA) ; 1999
    In:  The Journal of the Acoustical Society of America Vol. 106, No. 4_Supplement ( 1999-10-01), p. 2291-2291
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 106, No. 4_Supplement ( 1999-10-01), p. 2291-2291
    Abstract: A theoretical analysis is presented for the free-shape oscillations of surfactant-bearing drops suspended in air using the method of spherical harmonic expansions. Two extreme types of surfactant mass transfer between the bulk and the surface of drops are considered: (1) no surfactant transport as the drop oscillates; and (2) the surfactant transport is so fast that the surface surfactant concentration remains constant and homogeneous. It is found that the shear viscosity of bulk phase, surface elasticity, surface shear viscosity and surface dilatational viscosity have the same order of influence on the free-damping constant when the surface shear viscosity is smaller than a certain value. Otherwise, the free-damping constant is determined by the surface shear viscosity, and the influence of the surface dilatational viscosity, the surface elasticity, and the shear viscosity of the bulk phase on the drop oscillation is negligible.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.427839
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1999
    detail.hit.zdb_id: 1461063-2
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