ballast


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ballast

(bal'ăst),
1. Material of doubtful value itself used to stabilize something (for example, maritime practice). 2. Something largely without intrinsic value.

ballast 

Additional weight of material incorporated in a part of a contact lens to maintain it in a given orientation (Fig. B1). This is often provided by giving prismatic power to the lens (prism ballast lens).
Fig. B1 Truncated and prism-ballasted toric contact lensenlarge picture
Fig. B1 Truncated and prism-ballasted toric contact lens
References in periodicals archive ?
Network Rail initially barred this type of ballast distributor from being used on its infrastructure following the accident.
Today, MRAIL said Seoul Metro is migrating all its ballasted tracks to the slab track configuration.
Ballast-Check 2 can be used by a ship's crew before pulling into port providing necessary paperwork to show port state control that the ballast water is managed.
The existing research findings mainly focus on vertical or transversal stability and do not cover all the aspects involved in the ballast response.
Under the BWM Convention all ships must carry a ballast water record book and an International Ballast Water Management Certificate.
Redevelopment work is taking place on the former Swan Hunter site, while a housing estate sits where the Hebburn ballast hill once was.
Constellation Brands plans to purchase Ballast Point for approximately $1 billion.
"We believe in the proven strengths of Ballast Nedam in engineering and specialized construction methods and Ballast Nedam's potential to competitively leverage these in the international markets," Renaissance President Erman Illcak said in a statement.
developed a polyurethane spray for ballast consisting of polyisocyanates with alkyl groups, polyether polyols or amines, and a blowing agent.
Ballast Nedam had earlier forecast an operating loss for the full year of 2014 of between EUR35m and EUR45m, with a strong improvement in solvency from approximately 10% (first half 4%).
Ballast Nedam expects negative operating results of between EUR35m and EUR45m (USD43.5m/USD55.9m) for the entire 2014 and improved solvency of about 10%.
Osaka, Jan 29, 2014 - (JCN Newswire) - Panasonic Environmental Systems & Engineering Co., Ltd., a Panasonic group company, today announced that it has developed an on-board ballast water management system using an in-line electrolysis method to disinfect ballast water.