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306 results

Page 1 of 16

  • Experimental research on detonation initiation and transition in millimeter-scale planar combustion chambers

  • Y. Gao, Y. Yan, Z. Wang, B. Yang, H. Hu
  • Journal:
    The Aeronautical Journal / Volume 129 / Issue 1332 / February 2025
    Published online by Cambridge University Press:
    29 November 2024, pp. 296-311

  • To investigate the flame acceleration to detonation in 2.0 and 0.5 mm planar glass combustion chambers, the experiments have been conducted utilising ethylene/oxygen mixtures at atmospheric pressure and temperature. The high-speed camera has been used to record the revolution of flame front and pressure inside the combustion chamber. Different equivalence ratios and ignition locations have been considered in the experiments. The results show that the detonation pressure in the 2 mm thick chamber is nearly three times of Chapman-Jouguet pressure, while detonation pressure in the 0.5 mm thick chamber is only 45.7% of the Chapman-Jouguet value at the stoichiometric mixture. This phenomenon is attributed to the larger pressure loss in the thinner chamber during the detonation propagation. As the value of equivalence ratio is 2.2, the detonation cannot be produced in the 2 mm thick chamber, while the detonation can be generated successfully in the 0.5 mm thick chamber. This phenomenon indicates that the deflagration is easily to be accelerated and transformed into the detonation, due to a larger wall friction and reflection. Besides, the micro-obstacle has been added into the combustor can shorten the detonation transition time and reduces the distance of the detonation transition.

  • Instrumented insoles for assessment of gait in patients with vestibular schwannoma

  • Part of
  • Stephen Leong, Bing M. Teh, Ton Duong, Diane Hu, Alexander Chui, Jocelyn S. Chen, Michael B. Sisti, Tony J.C. Wang, Damiano Zanotto, Anil K. Lalwani
  • Journal:
    Wearable Technologies / Volume 4 / 2023
    Published online by Cambridge University Press:
    10 May 2023, e14
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  • Background

    Imbalance and gait disturbances are common in patients with vestibular schwannoma (VS) and can result in significant morbidity. Current methods for quantitative gait analysis are cumbersome and difficult to implement. Here, we use custom-engineered instrumented insoles to evaluate the gait of patients diagnosed with VS.

    Methods

    Twenty patients with VS were recruited from otology, neurosurgery, and radiation oncology clinics at a tertiary referral center. Functional gait assessment (FGA), 2-minute walk test (2MWT), and uneven surface walk test (USWT) were performed. Custom-engineered instrumented insoles, equipped with an 8-cell force sensitive resistor (FSR) and a 9-degree-of-freedom inertial measurement unit (IMU), were used to collect stride-by-stride spatiotemporal gait parameters, from which mean values and coefficients of variation (CV) were determined for each patient.

    Results

    FGA scores were significantly correlated with gait metrics obtained from the 2MWT and USWT, including stride length, stride velocity, normalized stride length, normalized stride velocity, stride length CV, and stride velocity CV. Tumor diameter was negatively associated with stride time and swing time on the 2MWT; no such association existed between tumor diameter and FGA or DHI.

    Conclusions

    Instrumented insoles may unveil associations between VS tumor size and gait dysfunction that cannot be captured by standardized clinical assessments and self-reported questionnaires.

  • The natural course of otitis media with effusion in infants who failed universal newborn hearing screening: a retrospective cohort study

  • Y-L Hu, Z-F Xia, W-B Tuo, C-H Yuan, W-N Guo, C Yao
  • Journal:
    The Journal of Laryngology & Otology / Volume 137 / Issue 10 / October 2023
    Published online by Cambridge University Press:
    20 March 2023, pp. 1158-1164
    Print publication:
    October 2023
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  • Objectives

    To analyse the natural course of infants with otitis media with effusion who failed universal newborn hearing screening and to explore the appropriate observation period.

    Methods

    This retrospective cohort analysis included infants with otitis media with effusion who failed universal newborn hearing screening every 3 months for 12 months.

    Results

    The average recovery time of the 155 infants was 7.08 ± 0.32 months after diagnosis. Multivariate Cox regression analysis confirmed that frequent reflux, maxillofacial deformities and initial hearing status were independent factors affecting recovery. Moreover, the cumulative recovery of most infants with mild hearing loss and infants with moderate hearing loss accompanied by frequent reflux was significantly higher at six months after diagnosis than at three months.

    Conclusion

    For most infants with mild hearing loss, as well as those with moderate hearing loss accompanied by frequent reflux, the observation period can be extended to six months after diagnosis.

  • 12 - Hydrodynamics and thermalization

  • from Part IV - Thermal, kinetic and hydrodynamic regimes
  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 345-388
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  • 15 - Nonequilibrium quantum processes in the early universe

  • from Part V - Applications to selected current research
  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 447-489
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  • 11 - Quantum kinetic field theory

  • from Part IV - Thermal, kinetic and hydrodynamic regimes
  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 315-344
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  • 13 - Nonequilibrium Bose–Einstein condensates

  • from Part V - Applications to selected current research
  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 391-428
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  • Part II - Basics of nonequilibrium quantum field theory

  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 91-92
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  • Dedication

  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp vii-viii
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  • Part I - Fundamentals of nonequilibrium statistical mechanics

  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 1-2
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  • Frontmatter

  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp i-vi
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  • 7 - Magneticmonopoles and solitons

  • from Part III - Gauge invariance, dissipation, entropy, noise and decoherence
  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 211-230
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  • 6 - Functional methods in nonequilibrium QFT

  • from Part II - Basics of nonequilibrium quantum field theory
  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 170-208
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  • 14 - Nonequilibrium issues in RHICs and DCCs

  • from Part V - Applications to selected current research
  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 429-446
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  • Index

  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 530-536
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  • 9 - Entropy generation and decoherence of quantum fields

  • from Part III - Gauge invariance, dissipation, entropy, noise and decoherence
  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 251-288
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  • Part III - Gauge invariance, dissipation, entropy, noise and decoherence

  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 209-210
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  • Part V - Applications to selected current research

  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 389-390
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  • Preface to the First Edition

  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp xiii-xvi
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  • 1 - Basic issues in nonequilibrium statistical mechanics

  • from Part I - Fundamentals of nonequilibrium statistical mechanics
  • Esteban A. Calzetta, Universidad de Buenos Aires, Argentina, Bei-Lok B. Hu, University of Maryland, College Park
  • Book:
    Nonequilibrium Quantum Field Theory
    Published online:
    04 November 2022
    Print publication:
    09 February 2023, pp 3-38
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Page 1 of 16