reference-level balloon

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• Balloon modelling — A balloon artist in Vienna, Austria Balloon modelling or balloon twisting is the shaping of special modelling balloons into almost any given shape, often a balloon animal. People who create balloon animals and other twisted balloon sculptures are …   Wikipedia

• Level junction — Not to be confused with Level crossing. Flat junction: trains have to wait to cross the diamond at the center …   Wikipedia

• Barrage balloon — A barrage balloon is a large balloon tethered with metal cables, used to defend against low level attack by aircraft by damaging the aircraft on collision with the cables, or at least making the attacker s approach more difficult. Some versions… …   Wikipedia

• Skyhook balloon — The skyhook balloon launched in 1957 to photograph the sun Skyhook balloons were balloons developed by Otto C. Winzen and General Mills, Inc., and used by the United States Navy Office of Naval Research in the late 1940s and in the 1950s for… …   Wikipedia

• Pilot licensing in Canada — is governed by Transport Canada in accordance with the Aeronautics Act and the Canadian Aviation Regulations (CARs). A person may operate an aircraft or act as a flight crew member only with a licence issued by Transport Canada. Personnel… …   Wikipedia

• 1 myriametre — The Strait of Gibraltar is 13 kilometres wide 10 kilometres redirects here. For the long distance running event, see 10,000 metres. To help compare different orders of magnitude this page lists lengths between 10 and 100 kilometres (104 to 105… …   Wikipedia

• DBZ (meteorology) — dBZ stands for decibels of Z. It is a meteorological measure of equivalent reflectivity (Z) of a radar signal reflected off a remote object. [ [http://www.srh.noaa.gov/jetstream/append/glossary d.htm NWS JetStream Weather Glossary: D s ] ] The… …   Wikipedia

• dBZ (meteorology) — For other uses, see DBZ (disambiguation). The scale of dBZ values can be seen along the bottom of the image. dBZ stands for decibels of Z. It is a meteorological measure of equivalent reflectivity (Z) of a radar signal reflected off a remote… …   Wikipedia

• aerospace industry — Introduction       assemblage of manufacturing concerns that deal with vehicular flight within and beyond the Earth s atmosphere. (The term aerospace is derived from the words aeronautics and spaceflight.) The aerospace industry is engaged in the …   Universalium

• building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …   Universalium

• Health and Disease — ▪ 2009 Introduction Food and Drug Safety.       In 2008 the contamination of infant formula and related dairy products with melamine in China led to widespread health problems in children, including urinary problems and possible renal tube… …   Universalium