Acoustic Resonance in Cylindrical Tubes with Side Branches

Schill, J.

doi:10.21236/ada577423

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…The voltage source F can be derived by applying a force balance assertion to the film. Applying boundary conditions to the film's acoustics, the pressure P across the surface of the film can be seen as twice the pressure of the incident wave [35]:…”

Section: Voltage Source Fmentioning

confidence: 99%

Broadband, large scale acoustic energy harvesting via synthesized electrical load: I. Harvester design and model

Monroe

Lang

2019

Smart Mater. Struct.

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With the rise of Internet-of-Things and connected devices, the need for self-powered wireless sensor nodes is ever increasing. One promising technology for self-powered sensor nodes in noisy environments is acoustic energy harvesting: deriving energy from ambient sound. Existing acoustic energy harvesters are typically based on resonant structures, yielding narrowband, and therefore low-energy, collection from broadband noise sources. In addition, existing acoustic energy harvesters tend to exhibit MEMS-scale sizes, with consequently low power outputs. This two-part work addresses the size and bandwidth of such harvesters. A large-scale acoustic energy harvester is developed, based on piezoelectric PVDF (polyvinylidene fluoride) film 100 cm 2 in size. The harvester is designed to minimize reactive impedance, allowing for circuit loading for broadband energy harvesting in Part II of this paper. An energy-based dynamic analysis of the harvester driven by an acoustic source yields an equivalent circuit model and subsequently a Thévenin equivalent model of the harvester. The model is validated by experiments including acoustic and electric measurements, laser Doppler vibrometry, and finite element analysis. It is used to develop loadings in Part II.

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Section: Voltage Source Fmentioning

confidence: 99%

Broadband, large scale acoustic energy harvesting via synthesized electrical load: I. Harvester design and model

Monroe

Lang

2019

Smart Mater. Struct.

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“…The program is based on Kempler's gestalt family theory (Kempler, 1974) and Juul's own experiences as a family therapist in Scandinavian countries (Schill, 2013). The program is dominated by dialogs that seek to enhance the relationship between the responsible parent and the competent child, and it includes behavioral changes in the parent.…”

Section: Interventionsmentioning

confidence: 99%

Effects of Parent Training Programs on Parental Stress in a General Swedish Population Sample

Löfgren¹,

Petersen²,

Nilsson³

et al. 2017

PSYCH

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This is a confirmatory study that assessed the effects of parent training programs on parental stress in a general population. There is a need to repeat and confirm earlier findings to acquire solid knowledge for policy stakeholders. In a quasi-experimental design, self-reported data were gathered at three occasions from 83 parents of children between the ages from one to ten years. These parents had responded to advertisements of parent training programs, and were matched to a comparison group of 83 parents chosen from a governmental database. Parent training program based upon behavioral, cognitive-behavioral, Adlerian and family system-theories. Parental stress due to incompetence, role restriction, social isolation, spousal relationship problems, and health problems were measured by the Swedish Parenthood Stress Questionnaire that is based on the Parent Stress Index Scale. The data indicated a reduction of stress in the sub-scale of health problems among parents in the intervention group with an effect size of 0.33, however, no other subscale showed the intervention as a significant variable when controlling for confounding variables. This study adds on the accumulated knowledge of supporting interventions for parents. We conclude that parent training programs have a significant effect on the stress components of parental health when implemented in real-life settings.

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A broadband point source loudspeaker design and its application to anechoic chamber qualification

Ghanavi

Cabrera

2021

Applied Acoustics

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Acoustic Resonance in Cylindrical Tubes with Side Branches

Cited by 5 publications

References 11 publications

Broadband, large scale acoustic energy harvesting via synthesized electrical load: I. Harvester design and model

Broadband, large scale acoustic energy harvesting via synthesized electrical load: I. Harvester design and model

Effects of Parent Training Programs on Parental Stress in a General Swedish Population Sample

A broadband point source loudspeaker design and its application to anechoic chamber qualification

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