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Displaying 54151 - 54175 of 74461

Vitamin A

December 1, 1997
Author(s)
Katherine E. Sharpless, Jeanice M. Brown Thomas, C P. Turley, M A. Brewster

Vitamin E

December 1, 1997
Author(s)
Katherine E. Sharpless, Jeanice M. Brown Thomas, C P. Turley, M A. Brewster

Critically Assessed Tables of Atomic Spectroscopy Data

November 30, 1997
Author(s)
Wolfgang L. Wiese
The major NIST atomic spectroscopy data tables and the new NIST atomic spectra database (ASD) on the Internet are briefly reviewed. The need for critical assessments of atomic transition probabilities data is discussed, and the still unsatisfactory data

Nonlinear Dynamics Model for Chip Segmentation in Machining

November 30, 1997
Author(s)
Timothy J. Burns, Matthew A. Davies
We have developed a new model for chip formation in machining which includes a mechanism for thermomechanical feedback. This leads to an interpretation of metal cutting as a process which is similar in many ways to an open chemical reactor. As the cutting

Internet Electronic Mail

November 25, 1997
Author(s)
Barbara Guttman, Robert H. Bagwill, Elizabeth B. Lennon
This ITL Bulletin summarizes a chapter of the draft Internet Security Policy: A Technical Guide. It describes email protocols, organization email policy, email problems, and solutions.

Accelerometer Calibration at NBS/NIST, The Last Thirty Years.

November 22, 1997
Author(s)
Beverly F. Payne
This paper gives a short history of the development of the accelerometer calibration services at NBS/NIST from the mid-1950s to 1996. Many people were involved in the research and development that has led to the present calibration services. The references

SFRF: Spatial Frequency Response Function Estimation Program

November 10, 1997
Author(s)
Thomas A. Germer, Clara C. Asmail
Measurements of optical scatter are often employed in production line diagnostics for surface roughness of silicon wafers. However, the geometry of the optical scatter instrumentation lacks universal standardization, making it difficult to compare values

Comparing Simple Role Based Access Control Models and Access Control Lists

November 7, 1997
Author(s)
John Barkley
The RBAC metaphor is powerful in its ability to express access control policy in terms of the way in which administrators view organizations. The functionality of simple Role Based Access Control (RBAC) models are compared to access control lists (ACL). A

Specifying and Managing Role-Based Access Control Within a Corporate Intranet

November 7, 1997
Author(s)
David F. Ferraiolo, John Barkley
In order for intranets to reach their full potential, access control and authorization management mechanisms must be in place that can regulate user access to information in a manner that is consistent with the current set of laws, regulations, and

Tool Wear Mechanism in Continuous Cutting of Hardened Tool Steels

November 4, 1997
Author(s)
Y K. Chou, Christopher J. Evans
Precision hard turning provides an alternative to grinding in some finishing applications. Rapid tool wear, however, remains an impediment to the process being economically viable. This experimental study investigates microstructural aspects of cubic boron

Application of Transmission Electron Detection to SCALPEL Mask Metrology

November 1, 1997
Author(s)
R Farrow, Michael T. Postek, William J. Keery, Samuel N. Jones, J R. Lowney, M Blakey, L Fetter, J Griffith, J E. Liddle, L C. Hopkins, H A. Huggins, M Peabody, A Novembre
Linewidth measurements were performed on a 4X scattering with angular limitation in projection electron lithography (SCALPEL) e-beam lithography mask using the transmitted electron signal in a modified scanning electron microscope. Features as small as 0

Application of Trasmission Electron Detection to Scalpel Mask Metrology

November 1, 1997
Author(s)
R Farrow, Michael T. Postek, William J. Keery, Samuel N. Jones, J R. Lowney, M Blakey, L Fetter, A Liddle, L C. Hopkins, H A. Huggins, M Peabody, A Novembre, J Griffith
Linewidth measurements were performed on a 4X scattering with angular limitation in projection electron lithography (SCALPEL) e-beam lithography mask using the transmitted electron signal in a modified scanning electron microscope. Features as small as 0

Applications of the Rapidly Renewable Lap

November 1, 1997
Author(s)
R E. Parks, E Robert, Christopher J. Evans, David J. Roderick, J David, John A. Dagata
The rapidly renewable lap is based on the simple concept of generating the figure needed in a lap substrate and then replicating it into a thin film slumped over the substrate. Based on this concept, we describe how efficient laps can be constructed for
Displaying 54151 - 54175 of 74461
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