Ha

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Ha,

formerly the suggested symbol for the name hahnium, which was applied variously to two elements, now called dubniumdubnium
, artificially produced radioactive chemical element; symbol Db; at. no. 105; mass number of most stable isotope 268; m.p., b.p., and sp. gr. unknown; valence +5.
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 and hassiumhassium
, artificially produced radioactive chemical element; symbol Hs; at. no. 108; mass number of most stable isotope 277; m.p., b.p., sp. gr., and valence unknown. Situated in Group 8 of the periodic table, it is expected to have properties similar to those of osmium.
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HA

Abbrev. for hour angle.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

ha

(mechanics)

Ha

(chemistry)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

high availability

Also called "RAS" (reliability, availability, serviceability) or "fault resilient," it refers to a multiprocessing system that can quickly recover from a failure. There may be a minute or two of downtime while one system switches over to another, but processing will continue. This is not the same as fault tolerant, in which redundant components are designed for continuous processing without skipping a heartbeat.

High availability also refers to being able to service a component in the system without shutting down the entire operation. See clustering and hot fix.
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References in periodicals archive ?
- Get a vaccine for hepatitis A if you travel to places where hepatitis may be endemic
* A review of the Hepatitis A products under development by companies and universities/research institutes based on information derived from company and industry-specific sources
* Receiving a blood transfusion with blood contaminated with hepatitis A (this is rare)
This finding supports the practice of many North American hepatologists, who generally have not given hepatitis A immunization to their patients with chronic hepatitis C, Dr.
People with hepatitis A or E should not prepare or handle food to be eaten by others.
Both hepatitis A and B are sexually transmissible, although through different methods.
(The hepatitis A virus typically isn't transmitted through exposure to infected blood.) They do not yet have a way to screen for hepatitis G and the other newly discovered viruses, points out another Science coauthor, Harvey Alter of the National Institutes of Health in Bethesda, Md.
Travelers are also at risk of contracting a form of "travel-hepatitis." But the good news is there is a vaccination against Hepatitis A.
IDSP supports testing for hepatitis A and E, and during outbreaks, testing for hepatitis B and C also is supported.
He stressed the need for adopting healthy and hygienic lifestyle to avoid hepatitis A and E.
Though hepatitis A tends to crop up in sporadic outbreaks, one community of Hasidic Jews in Brooklyn has been plagued for years with a small, seemingly intractable annual recurrence of infection, especially among families with toddlers.
* Hepatitis E-formerly called enteric or epidemic non-A, non-B hepatitis, resembles hepatitis A, but is caused by a different virus commonly found in the Indian Ocean area.