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hf    
n. high frequency（高频）的简写

high frequency（高频）的简写

Hf
n 1: a grey tetravalent metallic element that resembles
zirconium chemically and is found in zirconium minerals;
used in filaments for its ready emission of electrons [synonym:
{hafnium}, {Hf}, {atomic number 72}]
2: 3 to 30 megahertz [synonym: {high frequency}, {HF}]

Hydrofluoric \Hy`dro*flu*or"ic\, a. [Hydro-, 2 fluoric.]
(Chem.)
Pertaining to, or containing, hydrogen and fluorine;
fluohydric; as, hydrofluoric acid.
[1913 Webster]

{Hydrofluoric acid} (Chem.), a colorless, mobile, volatile
liquid, {HF}, very corrosive in its action, and having a
strong, pungent, suffocating odor. It is produced by the
action of sulphuric acid on fluorite, and is usually
collected as a solution in water. It attacks all
silicates, as glass or porcelain, is the agent employed in
etching glass, and is preserved only in vessels of
platinum, lead, caoutchouc, or gutta-percha.
[1913 Webster]


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  • Hydrogen fluoride - Wikipedia
    HF is diatomic in the gas phase As a liquid, HF forms relatively strong hydrogen bonds, hence its relatively high boiling point Solid HF consists of zigzag chains of HF molecules
  • Hydrogen Fluoride | Chemical Emergencies | CDC
    Background Hydrogen fluoride is a chemical compound (made up of two or more elements) that has the element fluorine It can be a colorless gas or a fuming liquid, which means it creates gas vapors It can also be dissolved in water When hydrogen fluoride is dissolved in water, it may be called hydrofluoric acid Hydrogen fluoride can be made when other compounds with fluoride, such as
  • Classes and Stages of Heart Failure - American Heart Association
    The American Heart Association explains the classes of heart failure Doctors usually classify patients' heart failure according to the severity of their symptoms
  • What Is Heart Failure? - NHLBI, NIH
    Heart failure is a condition that occurs when your heart can't pump enough blood for your body's needs Learn about the symptoms, causes, risk factors, and treatments for heart failure
  • What is HF? - American Association of Heart Failure Nurses - AAHFN
    Heart Failure (HF) is a very common problem in the United States 1 in 5 Americans will develop heart failure in their lifetime 1 About 915,000 new patients are diagnosed with heart failure each year 1 It is the leading cause for adults over the age of 65 to be admitted to the hospital
  • Hellman Friedman Private Equity San Francisco-New York-London
    Hellman Friedman is a leading private equity firm focused on market-leading firms with growth potential San Francisco, New York and London 415 788-5111
  • SPIRIT-HF: Does Spironolactone Benefit Patients With HFpEF, HFmrEF?
    Spironolactone, an aldosterone blocker, compared with placebo, did not show any significant improvement in terms of heart failure (HF) hospitalizations and cardiovascular death at 24 months in patients with HF with preserved or mildly reduced ejection fraction (HFpEF, HFmrEF), according to results
  • HF Sinclair Corporation | Investor Relations
    HF Sinclair Corporation (HF Sinclair), headquartered in Dallas, Texas, is an independent energy company Produces and markets high-value light products, such as gasoline, diesel fuel, jet fuel, renewable diesel and other specialty products





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