NIST Digital Archives
Not a member yet
149436 research outputs found
Sort by
Decorated Ostrich Egg
No full textThis ostrich egg was given to the National Institute of Standards and Technology (NIST) in celebration of NIST's centennial in 2001. The egg has the names of the Southern African Development Community Cooperation in Measurement Traceability (SADCMET) member nations and an image of several African mammals.16 x 12 x 12 cmHappy Centenary NIST from all the members of SADCME
Connie Morella (Maryland State Representative receives award from Karen Brown (Acting NIST Director, 2000-2001) at NIST 2001 Centennial History and Reunion Day
No full textNIST held a number of events to mark its centennial celebration in March 2001. The NIST History and Centennial Symposium-Reunion Day for NIST staff and alumni was held on March 5 AT NIST Boulder and NIST Gaithersburg, pictured here. This image is part of the NIST 2001 Centennial collection. The NIST 2001 Centennial collection consists of images of various celebrations of the 100th anniversary of the National Institute of Standards and Technology (NIST), previously known as the National Bureau of Standards
Karen Brown speaking at at the grand opening of the Lobby and Information Center during the NIST 2001 Centennial
No full textKaren Brown - Acting NIST Director, 2000-2001. NIST celebrated the grand opening of its Lobby and Information Center during its March 2001 Centennial Celebration. Attendees at the opening included Acting NIST Director Karen Brown, NIST staff, alumni, and guests. This image is part of the NIST 2001 Centennial collection. The NIST 2001 Centennial collection includes images of various celebrations of the 100th anniversary of the National Institute of Standards and Technology (NIST), previously known as the National Bureau of Standards
Cake cutting with Karen Brown (Acting NIST Director) and Connie Morella (MD state representative) at NIST 2001 Centennial History and Reunion Day
No full textNIST held a number of events to mark its centennial celebration in March 2001. The NIST History and Centennial Symposium-Reunion Day for NIST staff and alumni was held on March 5 AT NIST Boulder and NIST Gaithersburg, pictured here. This image is part of the NIST 2001 Centennial collection. The NIST 2001 Centennial collection consists of images of various celebrations of the 100th anniversary of the National Institute of Standards and Technology (NIST), previously known as the National Bureau of Standards
Patrick Gallagher, NIST Director, 2008-2014 (2nd from left), Mary Saunders, Associate Director for Management Resources (far left) at NIST 2001 Centennial History and Reunion Day
No full textNIST held a number of events to mark its centennial celebration in March 2001. The NIST History and Centennial Symposium-Reunion Day for NIST staff and alumni was held on March 5 AT NIST Boulder and NIST Gaithersburg, pictured here. This image is part of the NIST 2001 Centennial collection. The NIST 2001 Centennial collection consists of images of various celebrations of the 100th anniversary of the National Institute of Standards and Technology (NIST), previously known as the National Bureau of Standards
Karen Brown addressing attendees at the grand opening of the Lobby and Information Center during the NIST 2001 Centennial
No full textNIST celebrated the grand opening of its Lobby and Information Center during its March 2001 Centennial Celebration. Attendees at the opening included Acting NIST Director Karen Brown, NIST staff, alumni, and guests. This image is part of the NIST 2001 Centennial collection. The NIST 2001 Centennial collection includes images of various celebrations of the 100th anniversary of the National Institute of Standards and Technology (NIST), previously known as the National Bureau of Standards
Global and local optimization algorithms for optimal signal set design
No full textThe problem of choosing an optimal signal set for non-Gaussian detection was reduced to a smooth inequality constrained mini-max nonlinear programming problem by Gockenbach and Kearsley. Here we consider the application of several optimization algorithms, both global and local, to this problem. The most promising results are obtained when special-purpose sequential quadratic programming (SQP) algorithms are embedded into stochastic global algorithms
Powder X-ray reference patterns of Sr2RGaCu2Oy (R = Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, and Y)
No full textX-Ray Rietveld refinements were conducted on a series of eleven lanthanide phases, Sr2RGaCu2Oy (2112 phase, R = Pr, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er, Tm, and Yb) that are structurally related to the high T-c superconductor Ba2YCu3O7 (213). In the 2112 structure, instead of square planar Cu-O chains, tetrahedral GaO4 chains were found to run in a zig-zag fashion along the diagonal of the basal 213 ab-direction. Reference powder patterns for these compounds were prepared by using the Rietveld decomposition technique. The unit cell volume of these compounds follows the expected trend of the lanthanide contraction. The lattice parameters range from a = 22.9694(3) Angstrom, b = 5.5587(2) Angstrom. and c = 5.44743(7) Angstrom for R = Pr, to a = 22.8059(2) Angstrom, b = 5.46031(5) Angstrom, and c = 5.37773(5) Angstrom for R = Yb. An electon diffraction study of the Sm- and Er-analogs showed characteristic diffuse streaks along the b-axis, suggesting some disorder within the GaO4 chains
Environmental radiation monitoring at NBS/NIST from 1960 through 2000
No full textThe program for monitoring the environment in and about the site of the National Bureau of Standards, now the National Institute of Standards and Technology, at its Gaithersburg, Maryland location began in 1960. The program includes measurements of radiation fields at the fence line of the site and of radionuclides in samples of soil, water, and biota taken within and around the site. A variety of instruments and equipment, processes and procedures, and measurement devices has been employed. To date, no measurement from the routine program has exhibited any result that could be attributed to any effluent or other effect of the radiological work conducted at the site; that includes the NIST Research Reactor, the now defunct Linear Electron Accelerator (LINAC) and other accelerators, radiochemistry, and scaled source operations
Towards near perfect crystals with only well-characterized imperfections
No full textThroughout the past century NBS/NIST supported a great variety of research studies in crystallography where the aim was the highest attainable accuracy in measurements. While avoiding overlap with other papers in this volume, this article summarizes results from: 1) early work on crystallization as a method of purification, in contributions to sugar chemistry, and in solution growth of large crystals; 2) the NBS/ARPA Program of research on crystal growth and characterization; 3) the NBS Free-Radical Research Program; 4) the XRCD method as a direct path to relative atomic mass data and the fundamental physical constants; 5) the dynamical theory of x-ray diffraction; and 6) symmetry considerations such as are involved in the influence on crystals of mechanical stress or fields, and of point defect motion