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Erratum: Possible advantages of a robust evaluation of comparisons (vol 105, pg 551, 2000)
No full textConference Report: INFORMATION TECHNOLOGY FOR ENGINEERING AND MANUFACTURING, Gaithersburg, MD, June 12-13, 2000
No full textErratum: Comparison of the NIST and NPL air Kerma standards used for X-ray measurements between 10 kV and 80 kV (vol 105, pg 701, 2000)
No full textRound robin for optical fiber Bragg grating metrology
No full textNIST has administered the first round robin of measurements for optical fiber Bragg gratings. We compared the measurement of center wavelength, bandwidth, isolation, minimum relative transmittance, and relative group delay among several grating types in two industry groups, telecommunications and sensors. We found that the state of fiber Bragg grating metrology needs improvement in most areas. Specifically, when tunable losers ave used a filter is needed to remove broadband emissions from the laser. The linear slope of relative group delay measurements is sensitive to drift and systematic bias in the rf-modulation technique. The center wavelength measurement had a range of about 27 pm in the sensors group and is not adequate to support long-term structural monitoring applications
Martin Greenspan
No full textMARTIN GREENSPAN
Inducted: 2000
Citation:
For his leadership of the NBS acoustical physics program, and his editorial service to the Journal of the Acoustical Society of America and to the NBS Journal of Research.
Tenure: 1935 ‑ 1974
Birth: 1912, New York, New York
Death: 1987, Silver Spring, Maryland
Education:
Cooper Union Institute of Technology, BS (Electrical Engineering), 1934
Positions held:
Chief, Sound Section, Mechanics Division, Institute for Basic Standards
Instructor in NBS Graduate School
Post‑retirement: Consultant in Engineering Physics
Honors:
U.S. Department of Commerce Silver Medal, 1949, 1961
Acoustical Society of America: Silver Medal, 1977; Gold Medal, 1983
Institute of Electrical and Electronics Engineers Harry Diamond Award, 1980
Memberships:
Acoustical Society of America (Fellow; President; Chairman, Technical Council)
American Physical Society (Fellow)
American Association for the Advancement of Science (Fellow)
International Union of Pure and Applied Physics (U.S. National Committee)
National Research Council
Publications:
Author of technical papers on physical acoustics; associate editor of Journal of the Acoustical Society of America and editor of Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation
President Bill Clinton and Commerce Secretary William Daley applaud during the National Quality Awards Ceremony
No full textThis image is part of the Malcolm Baldrige Portrait File collection. The Malcolm Baldrige File collection contains photographs of the annual national award given by the President of the United States for industrial excellence. The award was named for Secretary of Commerce Malcolm Baldrige who died in 1987. The collection also includes photographs of the Malcolm 'Mac' Baldrige National Oceanic and Atmospheric Administration (NOAA) Ship
Magnetic rotation in the A=80 region: M1 bands in heavy Rb isotopes
No full textWe have studied the isotopes Rb-82(45), Rb-83(46), and Rb-84(47) to search for magnetic rotation which is predicted in the tilted-axis cranking model for a certain mass region around A = 80. Excited states in these nuclei were populated via the reaction B-11 + Ge-76 with E = 50 MeV at the XTU tandem accelerator of the LNL Legnaro. Based on a gamma-coincidence experiment using the spectrometer GASP we have found magnetic dipole bands in each studied nuclide. The regular M1 bands observed in the odd-odd nuclei Rb-82 and Rb-84 include B(M1)/B(E2) ratios decreasing smoothly with increasing spin in a range of 13(-) less than or equal to J(pi) less than or equal to 16(-). These bands are interpreted in the tilted-axis cranking model on the basis of four-quasiparticle configurations of the type pi(fp) pi g(9/2)(2) nu g(9/2). This is the first evidence of magnetic rotation in the A approximate to 80 region. In contrast, the M1 sequences in the odd-even nucleus Rb-83 are not regular, and the B(M1)/B(E2) ratios show a pronounced staggering
How far from stability can we go using Gammasphere and the FMA?
No full textThis paper presents new results obtained using the U.S. national gamma-ray facility Gammasphere, which has been operating at the ATLAS accelerator at Argonne National Laboratory since January 1998. Gammasphere was built at Lawrence Berkeley Laboratory and used primarily as a powerful spectrometer for studying nuclei at the highest spins [1]
Precision lifetime measurements using the recoil distance method
No full textThe recoil distance method (RDM) for the measurements of lifetimes of excited nuclear levels in the range from about 1 ps to 1000 ps is reviewed. The New Yale Plunger Device for RDM experiments is introduced and the Differential Decay curve Method for their analysis is reviewed. Results from recent RDM experiments on SD bands in the mass-190 region, shears bands in the neutron deficient lead isotopes, and ground state bands in the mass-130 region are presented. Perspectives for the use of RDM measurements in the study of neutron-rich nuclei are discussed