The properties of bird feathers as converse piezoelectric transducers and as receptors of microwave radiation. I. Bird feathers as converse piezoelectric transducers.

PAPER pubmed Biotelemetry 1975 Other Effect: unclear Evidence: Insufficient

Read original paper → PMID: 1235241 Evidence Lab

Abstract

An investigation was made of the properties of bird feathers as piezoelectric transducers in the audiofrequency range and as dielectric receptors of electromagnetic radiation in the microwave region. In the first case, cartridges of the ceramic and magnetic type and an electromagnetic transducer probe were used as detecting devices. Results show piezoelectric resonances in the 1 to 20-kHz region for the calami of feathers.

AI evidence extraction

At a glance

Study type

Other

Effect direction

unclear

Population

—

Sample size

—

Exposure

microwave

Evidence strength

Insufficient

Confidence: 66% · Peer-reviewed: yes

Main findings

The study investigated bird feathers as piezoelectric transducers in the audiofrequency range and as dielectric receptors of electromagnetic radiation in the microwave region. It reports piezoelectric resonances in the 1–20 kHz region for the calami of feathers.

Outcomes measured

Piezoelectric resonances of feather calami (1–20 kHz)
Feathers as dielectric receptors of electromagnetic radiation in the microwave region (property investigated)

Limitations

No microwave exposure parameters (frequency, power, duration) reported in the abstract
No sample size or species details reported in the abstract
Abstract reports resonance findings but does not report biological/health outcomes

View raw extracted JSON

{
    "study_type": "other",
    "exposure": {
        "band": "microwave",
        "source": null,
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "Piezoelectric resonances of feather calami (1–20 kHz)",
        "Feathers as dielectric receptors of electromagnetic radiation in the microwave region (property investigated)"
    ],
    "main_findings": "The study investigated bird feathers as piezoelectric transducers in the audiofrequency range and as dielectric receptors of electromagnetic radiation in the microwave region. It reports piezoelectric resonances in the 1–20 kHz region for the calami of feathers.",
    "effect_direction": "unclear",
    "limitations": [
        "No microwave exposure parameters (frequency, power, duration) reported in the abstract",
        "No sample size or species details reported in the abstract",
        "Abstract reports resonance findings but does not report biological/health outcomes"
    ],
    "evidence_strength": "insufficient",
    "confidence": 0.66000000000000003108624468950438313186168670654296875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "bird feathers",
        "calami",
        "piezoelectric",
        "converse piezoelectric transducers",
        "audiofrequency",
        "1–20 kHz",
        "microwave radiation",
        "dielectric receptors",
        "electromagnetic radiation"
    ],
    "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract/metadata and may be incomplete or incorrect. This content is for informational purposes only and is not medical advice.

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