ballast


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Related to ballast: Electrical ballast

ballast

1. any dense heavy material, such as lead or iron pigs, used to stabilize a vessel, esp one that is not carrying cargo
2. crushed rock, broken stone, etc., used for the foundation of a road or railway track
3. Electronics a device for maintaining the current in a circuit

Ballast

Power-regulating device that modifies input voltage and controls current to provide the electrical conditions necessary to start and operate gaseous discharge lamps, especially fluorescents and HID (high-intensity discharge) lamps.

ballast

[′bal·əst]
(aerospace engineering)
A relatively dense substance that is placed in the cab of a balloon and can be thrown out to reduce the load or can be shifted to change the center of gravity.
(civil engineering)
Crushed stone used in a railroad bed to support the ties, hold the track in line, and help drainage.
(electricity)
A circuit element that serves to limit an electric current or to provide a starting voltage, as in certain types of lamps, such as in fluorescent ceiling fixtures.
(materials)
Coarse gravel used as an ingredient in concrete.
(naval architecture)
A relatively heavy material such as lead, iron, or water placed in a ship to ensure stability or to maintain the proper draft or trim.
To pump seawater into empty fuel tanks of a ship to ensure its stability or suitable draft and trim for seaworthiness.

ballast

1. Coarse stone, gravel, slag, etc., used as an underlayer for poured concrete.
2. A device used to provide the required starting voltage and operating current for fluorescent, mercury, or other electric-discharge lamps.
3. Class P: A ballast for a fluorescent lamp which meets the requirements of the Underwriters’ Laboratories, Inc.; includes an automatic resetting thermal protector to remove the ballast from the circuit if its temperature exceeds a specified value.

ballast

Weight installed in an airplane to ensure that the center of gravity is always within the permissible limits. In some aircraft, fuel is used as a ballast. This fuel, however, cannot be burned by the aircraft.
References in periodicals archive ?
This show will be yet another opportunity to educate decision makers on the benefits of daylight harvesting and green energy in general; and specifically how the Axis ballasts can help achieve these energy reduction and environmental benefits," stated Jim Erickson, President of Axis Technologies, Inc.
Upon successful completion and settlement of the Offer, Renaissance Construction shall make a capital contribution to Ballast Nedam of EUR 30 million, either in the form of a rights issue of EUR 20 million and a private placement of EUR 10 million at a market customary discount, or in the event that more than 95% is held by Renaissance Construction, in a form to be determined by Renaissance Construction at its sole discretion;
Dumping ballast water into foreign ports could have dire consequences for native marine creatures and for the people whose livelihoods depend upon them, says Carlton.
Beginning this November, transoceanic shippers must exchange freshwater ballast for seawater before entering the Great Lakes - a move aimed at preventing the transport of freshwater exotics from one continent to another.
IR's new ballast control IC utilizes IR's advanced high-voltage IC process which incorporates next-generation high-voltage level-shifting and termination technology to deliver superior electrical over-stress protection and higher field reliability.
Completion of sale of Ballast Nedam Offshore's activities to Van Oord
The documented information was reviewed and approved by a joint panel of experts from the Scientific Aspects of Marine Environment Protection ballast water working group.
Analysts forecast the Global Ballast Water Treatment Systems market to grow at a CAGR of 24.
Ballast Nedam will also transfer the management of the joint-venture in the forthcoming period.
Ballast Nedam has reached agreement on the recently announced sale of Ballast Nedam Offshore's activities.
the developer of the innovative Canting Ballast Twin Foil (CBTF[TM]) Technology, today announced that the Reichel-Pugh-designed Wild Oats XI again took line honors in the 61st running of the Rolex Sydney Hobart Yacht Race.
The claim arose in 2012 following delays and disruption to the project, for which Ballast Nedam is holding the client liable.