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  2. Heart failure with preserved ejection fraction - Wikipedia

    en.wikipedia.org/wiki/Heart_failure_with...

    Heart failure with preserved ejection fraction (HFpEF) is a form of heart failure in which the ejection fraction – the percentage of the volume of blood ejected from the left ventricle with each heartbeat divided by the volume of blood when the left ventricle is maximally filled – is normal, defined as greater than 50%; [1] this may be measured by echocardiography or cardiac catheterization.

  3. Pulverized coal-fired boiler - Wikipedia

    en.wikipedia.org/wiki/Pulverized_coal-fired_boiler

    Subcritical plants operate at about 37% efficiency, supercritical plants at about 40%, and ultra-supercritical plants in the 42-45% range. There are many type of pulverized coal, having different calorific values (CV), such as Indonesian coal or steel grade coal (Indian coal).

  4. Pfizer–BioNTech COVID-19 vaccine - Wikipedia

    en.wikipedia.org/wiki/Pfizer–BioNTech_COVID-19...

    The vaccine is delivered in vials that, once diluted, contain 2.25 mL of vaccine, comprising 0.45 mL frozen and 1.8 mL diluent. [153] According to the vial labels, each vial contains five 0.3 mL doses, however excess vaccine may be used for one, or possibly two, additional doses.