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  • Molecular Diversity Preservation International  (47)
  • American Institute of Physics (AIP)  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Erratum: "Features of nonlinear interactions between a free surface and a shed vortex shear layer'' [Phys. Fluids A 3, 2485 (1991)] (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 636-636 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858526
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Features of nonlinear interactions between a free surface and a shed vortex shear layer (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2485-2488 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear interaction between a free surface, under gravitational acceleration g, and the vortex shear layer shed by a thin surface-piercing plate, initial submergence h, started abruptly from rest to a constant horizontal velocity U, is studied numerically. The problem is governed by a single parameter, the Froude number Fn = U/(square root of)gh. Depending on Fn, three classes of interaction dynamics are identified in the wake of the plate. For subcritical Fn((approximately-less-than)0.7), a plunging breaker forms on the free surface before significant interaction with the vortex sheet occurs. For both transcritical and supercritical Fn, the deformation of the free surface stretches the vortex sheet, and finite-amplitude Kelvin–Helmholtz instabilities arise, which roll up into double-branch spirals. In the transcritical range (Fn∼ 0.7–1.0), the interactions between the free surface and the Kelvin–Helmholtz instabilities remain weak, which allows the latter to roll up continuously into a series of double-branch spirals. For supercritical Fn((approximately-greater-than)1.0), the double-branch spiral becomes entrained into the free surface resulting in large surface deformations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858189
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  • 3
    Electronic Resource
    Electronic Resource
    Numerical calculation of nonlinear axisymmetric standing waves in a circular basin (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 3441-3447 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The solution of fully nonlinear first-mode axisymmetric standing waves in a circular basin is obtained numerically by direct collocation of truncated Fourier and Dini series in time and radial coordinates, respectively. The method produces accurate results which offer substantial improvements, especially in shallow depth, over existing solutions based on perturbation expansions. Numerical results for the frequency, partition of energy, surface profiles, and particle trajectories are presented for both deep and shallow water for a range of steepnesses. It is found that salient features such as the nonmonotonic dependence of frequency on steepness at certain depths, characteristic of two-dimensional standing waves, are also observed for axisymmetric standing waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866476
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  • 4
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    Gigawatt-class radiation generated by a Ka-band overmoded Cherenkov-type high power millimeter wave generator (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-08-29
    Description: Particle simulation and experimental results are presented about a Ka-band overmoded Cherenkov-type high power millimeter wave generator in this paper. The relativistic electron beam with peak current of 8.4 kA was generated by a pulsed power accelerator working at the voltage of 625 kV, which was guided by an axial magnetic field of 1.05 T and transported through the beam-wave interaction structures. After careful calibration, the microwave power radiated in the far field was as high as about 500 MW, with a frequency of 32.1 GHz and a pulse width of 20 ns. The radiation mode was well controlled to be TM 0 n mode.
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    Factors influencing the temporal growth rate of the high order TM0n modes in the Ka-band overmoded Cherenkov oscillator (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-06-03
    Description: When the wavelength of overmoded Cherenkov oscillator goes into Ka-band, power handling capacity becomes an essential issue. Using the TM 02 mode or higher order TM 0 n modes as the operating mode is a potential solution. This paper is aimed to find some proper parameters to make the temporal growth rate of the TM 02 mode higher in our previously studied Gigawatt (GW)-class Ka band oscillator. An accurate and fast calculation method of the “hot” dispersion equation is derived for rectangular corrugated SWSs, which are widely used in the high frequency Cherenkov devices. Then, factors that affect the temporal growth rate of the high order TM 0 n modes are analyzed, including the depth of corrugation, the radius of drift tube, and the diode voltage. Results show that, when parameters are chosen properly, the temporal growth rate of the TM 02 mode can be as high as 0.3 ns −1 .
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 6
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    Landau level crossing in a spin-orbit coupled two-dimensional electron gas (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-01-07
    Description: We have studied experimentally the Landau level (LL) spectrum of a two-dimensional electron gas (2DEG) in an In 0.53 Ga 0.47 As/InP quantum well structure by means of low-temperature magneto-transport coincidence measurement in vector magnetic fields. It is well known that LL crossing occurs in tilted magnetic fields due to a competition between cyclotron energy and Zeeman effect. Remarkably, here we observe an additional type of level-crossing resulting from a competition between Rashba and Zeeman splitting in a small magnetic field, consistent with the theoretical prediction for strongly spin-orbit coupled 2DEG.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 7
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    Mode composition analysis on experimental results of a Gigawatt-class Ka-band overmoded Cerenkov oscillator (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-07-23
    Description: In this paper, a modified numerical method is used to investigate the mode composition of a Gigawatt-class Ka-band overmoded Cerenkov oscillator, which has been proposed and studied in our previous experiment. In the experiment, the measured angular distribution of radiation did not fit a single TM 01 mode. So the particle in cell code calculations and the antenna radiation calculations are carried out, which show a consistent picture: the dominant modes are the TM 01 mode and the TM 03 mode, and their phase relationship is constant with time; therefore, a steady radiation pattern is produced, which matches the experimental data. As a conclusion, the comprehensive analysis shows that the existing modes of the output microwave in our experiment are the first five TM 0 n modes ( n  = 1–5), with corresponding power ratios of 36.64%, 0.78%, 56.26%, 5.70%, and 0.52%, and relative phase differences of 0°, 146°, 54°, 169°, and 133°.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 8
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    New (1 − x)K0.45Na0.55Nb0.96Sb0.04O3-xBi0.5Na0.5HfO3 lead-free ceramics: Phase boundary and their electrical properties (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-07-23
    Description: Here, we reported a high unipolar strain and large piezoelectricity in new (1 −  x )K 0.45 Na 0.55 Nb 0.96 Sb 0.04 O 3 - x Bi 0.5 Na 0.5 HfO 3 ceramics. The rhombohedral-tetragonal (R-T) phase boundary was constructed in the ceramics with 0.03 
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 9
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    Learning Programming Language in Higher Education for Sustainable Development: Point-Earning Bidding Method (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-06-01
    Description: Promoting learning passion for students in higher education is a vital and challenging issue. Due to the swift changes in society and technology development, many convenient and interesting technologies increasingly interfere with students’ learning performances and reduce students’ motivation for attending classes. For example, mobile games and social networking have led students to lose their passion for learning. MAPS (Mind Mapping, Asking Questions, Presentation, Scaffolding Instruction) is a flipped teaching model which has been proved as an effective approach to increasing students’ reflective learning, allowing students to devote to self-learning and recovering their passion for learning. Thus, this study employed a MAPS teaching strategy that adopts a point-earning approach to encourage students to learn from peer feedback while the teacher can understand students’ learning from the process. When the class is over, students can exchange the points for other rewards through a bidding mechanism which encourages students to regain passion for learning. The concept of Scaffolding Instruction points out that allowing students to sense positive peer pressure, which is caused by their peers’ improvements, and the atmosphere where their peers are studying hard can enhance their learning motivation and reflection. The empirical results of this study found that peer assessment and feedback can improve the learning effectiveness of students with poor performance.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Molecular Diversity Preservation International
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  • 10
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    Roles of Silk Fibroin on Characteristics of Hyaluronic Acid/Silk Fibroin Hydrogels for Tissue Engineering of Nucleus Pulposus (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-06-17
    Description: Silk fibroin (SF) and hyaluronic acid (HA) were crosslinked by horseradish peroxidase (HRP)/H2O2, and 1,4-Butanediol di-glycidyl ether (BDDE), respectively, to produce HA/SF-IPN (interpenetration network) (HS-IPN) hydrogels. HS-IPN hydrogels consisted of a SF strain with a high content of tyrosine (e.g., strain A) increased viscoelastic modules compared with those with low contents (e.g., strain B and C). Increasing the quantities of SF in HS-IPN hydrogels (e.g., HS7-IPN hydrogels with weight ratio of HA/SF, 5:7) increased viscoelastic modules of the hydrogels. In addition, the mean pores size of scaffolds of the model hydrogels were around 38.96 ± 5.05 μm which was between those of scaffolds H and S hydrogels. Since the viscoelastic modulus of the HS7-IPN hydrogel were similar to those of human nucleus pulposus (NP), it was chosen as the model hydrogel for examining the differentiation of human bone marrow-derived mesenchymal stem cell (hBMSC) to NP. The differentiation of hBMSC induced by transforming growth factor β3 (TGF-β3) in the model hydrogels to NP cells for 7 d significantly enhanced the expressions of glycosaminoglycan (GAG) and collagen type II, and gene expressions of aggrecan and collagen type II while decreased collagen type I compared with those in cultural wells. In summary, the model hydrogels consisted of SF of strain A, and high concentrations of SF showed the highest viscoelastic modulus than those of others produced in this study, and the model hydrogels promoted the differentiation of hBMSC to NP cells.
    Electronic ISSN: 1996-1944
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Molecular Diversity Preservation International
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