يعرض 61 - 80 نتائج من 16,735 نتيجة بحث عن '(( 50 ppm decrease ) OR ( 50 ((ng decrease) OR (((a decrease) OR (mean decrease)))) ))', وقت الاستعلام: 0.95s تنقيح النتائج
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    Pulse Ultrasound-Based Response Enhancement of a MOX Gas Sensor حسب Yumin Yang (5737235)

    منشور في 2024
    "…For 2 ppm methanol, the RE by the pulse ultrasound is 50%, relative to the continuous ultrasound, when the pulse width, duty ratio, and working frequency are 0.4 ms, 50%, and 110.1 kHz, respectively. …"
  18. 78

    Pulse Ultrasound-Based Response Enhancement of a MOX Gas Sensor حسب Yumin Yang (5737235)

    منشور في 2024
    "…For 2 ppm methanol, the RE by the pulse ultrasound is 50%, relative to the continuous ultrasound, when the pulse width, duty ratio, and working frequency are 0.4 ms, 50%, and 110.1 kHz, respectively. …"
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    Means for STEM competence for pre- and post-test. حسب Esther Kim (2996622)

    منشور في 2024
    "…After the Challenge, participants increased in awareness of global issues, and engagement with others, but also showed a small but significant decrease in respect for people from other cultural backgrounds. …"