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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 ?
During the study period, emergency doctors admitted 1,394 episodes of UTI, of which 268 (19.2%) were in compliance with the HaH admission criteria, whereby they were transferred home to complete the stipulated therapeutic plan (Table 1).
"We are delighted to partner with HAH to realize this venture as their entrepreneurial culture and regional ambitions are an ideal match with ours," he added.
"HaH care bundled with a 30-day postacute transitional care episode was associated with better patient outcomes and ratings of care compared with inpatient hospitalization," the authors write.
Abbreviations HaH: Hemocyanin of Helix aspersa maxima DSC: Differential scanning calorimetry Tris-HCl: Tris(hydroxymethyl)aminomethane hydrochloride HEPES: 4-(2-Hydroxyethyl)-1-piperazineethanesulfonic acid.
The notochord length observed in larvae at 26[degrees]C was 2.91 [+ or -] 0.01 mm, which was significantly higher (P < 0.05) than those recorded in the other treatments at 120 HAH (Fig.
A spokeswoman from HAH said: "Over recent months Heathrow Airport Holdings group shareholders and management have been considering their strategic position in relation to our three airports, Aberdeen, Glasgow and Southampton.
The Spanish major has also been disposing of small portions of its interest in HAH. In October, the company sold 8.65% to UK pension fund scheme Universities Superannuation Scheme as part of its investment diversification strategy.
Spanish company Ferrovial has completed the sale of 10.62% of Heathrow Airport Holdings (HAH), formerly B, to Qatar Holding LLC for $779.9m.
The Betsi Cadwaladr NHS Trust is to be applauded for having the courage to implement Hospital at Home (HAH) schemes across North Wales.
This week's winner is Sophia, who writes of Tim Tebow's late-game heroics, "Hah. I was ready to convert if only da Bears could hold on for 56 seconds but nooooooooo.
Yee hah! There's a real festival feel to this gorgeous cowboy hat from New Look for pounds 4.99.
One of Bahrain's prominent trading companies, Haji Ali Haji (HAH), has ventured into manufacturing for the first time.