NAA can also be used to determine the activity of a radioactive sample.

NAA can vary according to a number of experimental parameters.

A relatively simple Farnsworth – Hirsch fusor can be used to generate neutrons for NAA experiments.

NAA can refer to:

Since the NAA is mandatory, and takes up a nibble, this represents a four-bit deficit.

In chemistry, neutron activation analysis ( NAA ) is a nuclear process used for determining the concentrations of elements in a vast amount of materials.

NAA allows discrete sampling of elements as it disregards the chemical form of a sample, and focuses solely on its nucleus.

NAA was discovered in 1936 by Hevesy and Levi, who found that samples containing certain rare earth elements became highly radioactive after exposure to a source of neutrons.

For the NAA procedure to be successful the specimen or sample must be selected carefully.

To carry out an NAA analysis the specimen is placed into a suitable irradiation facility and bombarded with neutrons.

Activation with epithermal neutrons is known as Epithermal NAA ( ENAA ).

Activation with fast neutrons is termed Fast NAA ( FNAA ).

General Motors Corporation took a controlling interest in NAA and merged it with its General Aviation division in 1933, but retaining the name North American Aviation.

NAA merged with Rockwell International in 1967, which was then bought by Boeing in December 1996.

In 1967, NAA and Rocketdyne merged with the Rockwell Corporation to form North American Rockwell, later part of Rockwell International.

The Collier Trophy is an annual aviation award administered by the U. S. National Aeronautic Association ( NAA ), presented to those who have made " the greatest achievement in aeronautics or astronautics in America, with respect to improving the performance, efficiency, and safety of air or space vehicles, the value of which has been thoroughly demonstrated by actual use during the preceding year.

The name became official in 1944, and the award presented once a year by the NAA president, with the trophy on permanent display at the U. S. National Air and Space Museum.

He wrote for an aviation column in " Argosy " magazine and was given a job with the National Aeronautic Association ( NAA ), for whom he produced a weekly radio show called " Scramble!

* " Registered " IEEE formats dispense with padding and place the OUI immediately after the NAA.

This work was not coordinated with the NAA or Smithsonian.

The NAA and the Smithsonian Institution's National Air and Space Museum worked to assemble a complete list to be published in conjunction with the NAA's hundredth anniversary in 2005, however this project was not completed and it appears that the source documents for a period of awards were destroyed.

The NAA has been steeply involved with the growth of aviation in the United States almost since its beginning, to the point of being the sole issuer of pilot licenses in American until the Civil Aeronautics Act of 1926.

In 1905, the NAA joined Germany, Spain, Belgium, the United Kingdom, Italy, Switzerland, and France to create an international aviation organization -- Fédération Aéronautique Internationale -- with the goal of fostering aeronautical activities worldwide.

The NAA has three distinct responsibilities: The recording and certification of Aviation and Aerospace Records, the administration of Aviation Trophies and Awards, and working with Air Sports Organizations in America on the advancement of their individual sports.

The United States portion of the contest is sponsored by the National Aeronautic Association ( NAA ) in partnership with the National Association of State Aviation Officials ( NASAO ) and supported by Embry-Riddle Aeronautical University ( ERAU ), National Coalition for Aviation Education ( NCAE ) and the Federal Aviation Administration ( FAA ).

The NAA encourages and supports the development and growth of the sport of aviation in the United States and does so primarily through its relationship with eight Air Sport Organizations ( ASOs ) based in the country.

The NAA Luncheon Program brings together leaders in the aviation and aerospace industry with professionals from around the Metropolitan Washington, DC region.

NAA is significantly different from other spectroscopic analytical techniques in that it is based not on electronic transitions but on nuclear transitions.

** A weather map is televised for the first time, sent from NAA Arlington to the Weather Bureau Office in Washington, D. C.

On May 5, 1990, the New Armenian Army ( NAA ), a defense force that was to serve as a separate entity from the Soviet Union's military, was created.

These four bits are recouped through the following tricks: First, two bits are stolen from the NAA by allocating NAAs 12, 13, 14, and 15 to all refer to the same format.

On 17 August, MP John Hemming received confirmation from OFCOM that usage of the NAA message would not be termed a persistent misuse, and there is no widespread belief that OFCOM will conclude that the six companies it is currently investigating should stop making silent calls and use the information message instead.

There are a number of detector types and configurations used in NAA.

The most common types of gamma detectors encountered in NAA are the gas ionisation type, scintillation type and the semiconductor type.

In order for a Flight Simulation Training Device ( FSTD ) to be used for flight crew training or checking, it must be evaluated by the local National Aviation Authority ( NAA ), such as the Federal Aviation Administration ( FAA ) in the United States.

three editions of The Age are printed nightly: the NAA edition, for interstate and country Victorian readers, the MEA edition, for metropolitan areas and a final late metropolitan edition, the THA.

NAA did retain ownership of Eastern Air Lines until 1938.

Two years later in 1948, General Motors divested NAA as a public company.

* ACME, NAA history: documents and photographs archive.

Auxins, especially 1-Naphthaleneacetic acid ( NAA ) and Indole-3-butyric acid ( IBA ), are also commonly applied to stimulate root growth when taking cuttings of plants.

The company was related to North American Aviation ( NAA ) for most of its history.

As the missile entered production, NAA spun off Rocketdyne in 1955 as a separate division.