U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 4926 - 4950 of 7112

Virtual Environment for Manipulating Microscopic Particles with Optical Tweezer

July 1, 2003
Author(s)
Thomas W. LeBrun, Kevin W. Lyons, Yong-Gu Lee
In this paper, we use virtual reality techniques to define an intuitive interface to a nanoscale manipulation device. This device utilizes optical methods to focus laser light to trap and reposition nano-to-microscopic particles. The underlying physics are

Virtual Environment for Manipulating Microscopic Particles with Optical Tweezer

June 1, 2003
Author(s)
Yong-Gu Lee, Kevin W. Lyons, Thomas W. LeBrun
In this paper, we use virtual reality techniques to define an intuitive interface to a nanoscale manipulation device. This device utilizes optical methods to focus laser light to trap and reposition nano-to-microscopic particles. The underlying physics are

Technical Aspects of the Digital Library of Mathematical Functions

May 1, 2003
Author(s)
Bruce R. Miller, Abdou S. Youssef
The NIST Digital Library of Mathematical Functions (DLMF) Project, begun in 1997, is preparing a handbook and Web site intended for wide communities of users. The contents are primarily mathematical formulas, graphs, methods of computation, references, and

Moving Object Prediction for Off-road Autonomous Navigation

April 25, 2003
Author(s)
Rajmohan Madhavan, Craig I. Schlenoff
The realization of on- and off-road autonomous navigation of Unmanned Ground Vehicles (UGVs) requires real-time motion planning in the presence of dynamic objects with unknown trajectories. To successfully plan paths and to navigate in an unstructured

Electron-Impact Total Ionization Cross-Sections of the Chlorofluoromethanes

January 1, 2003
Author(s)
Karl K. Irikura, M A. Ali, Yong Sik Kim
Electron-impact total ionization cross sections for CCl 3F (Freon 11), CCl 2F 2 (Freon 12), CClF 3 (Freon 13), CHCl 2F (Freon 21), CHClF 2 (Freon 22), and CH 2ClF (Freon 31) are calculated using the Binary-Encounter-Bethe (BEB) theoretical model. The BEB

Probe-Force Calibration Experiments Using the NIST Electrostatic Force Balance

January 1, 2003
Author(s)
Jon R. Pratt, David B. Newell, John A. Kramar, J Mulholland, Eric P. Whitenton
The sensitivity of a piezoresistive cantilever force sensor has been determined by probing the weighing pan of the NIST prototype electrostatic force balance. In this experiment, micronewton contact forces between a force probe and the balance''s weighing

Noise-Parameter Uncertainties: A Monte Carlo Simulation

October 1, 2002
Author(s)
James P. Randa
This paper reports the formulation and results of a Monte Carlo study of uncertainties in noise-parameter measurements. The simulator permits the computation of the dependence of the uncertainty in the noise parameters on uncertainties in the underlying

Highly Charged Ions

January 1, 2001
Author(s)
John D. Gillaspy
… nuclear fusion diagnostics, nanotechnology, quantum computing, and biology. …

The Effect of Anisotropy on the Second Virial Coefficient of H 2

August 1, 2000
Author(s)
Allan H. Harvey, M P. Hodges
Recently, Diep and Johnson 1 developed a pair potential for H 2-H 2 fitted to ab initio calculations at the coupled-cluster (CCSD(T)) level extrapolated to the complete basis set limit. They compared second viral coefficients B(T) from their potential to

Networking of Welding Applications: A Tutorial - Knowing the Basics Behind Network Technology Will Help Users of Welding Equipment Identify Where Networks May Be Most Beneficial

January 1, 2000
Author(s)
William G. Rippey, James D. Gilsinn, L Flitter
This article describes the basics of network technology and how networks are being applied to commercial welding applications. The goal is to help non-computer-expert weld technology users to decide where products that use networks may be beneficial, and

Internet Commerce for Manufacturing Product Data

April 1, 1999
Author(s)
Curtis H. Parks
Printed circuit assemblies (PCA) typically are designed on computer aided design (CAD) systems, checked, then released for manufacture. The released design description typically consists of a top assembly drawing and a series of data files which are used

Gapped Arresters Revisited: A Solution to Cascade Coordination

October 1, 1998
Author(s)
A. Mansoor, Francois D. Martzloff, K. O. Phipps
This paper provides a brief perspective on how the coordination of cascaded surge-protective devices (SPDs) has become an issue. We propose an approach where the 'ancient' technology of gapped arresters may well be the answer to the dilemma of the

Accurate Ab Initio Calculation of Molecular Constants

March 1, 1998
Author(s)
Svetlana A. Kotochigova, I Tupitsyn
The valence bond method and advanced computational technique are used to perform all-electron ab initio calculations of the electronic structure of diatomic molecules. The basic idea behind the method is to expand the molecular wavefunction in terms of

Development of a Message Model to Support Integrated Design and Manufacturing

November 1, 1997
Author(s)
Venkat Allada, Shaw C. Feng, Steven R. Ray
Mere data sharing between engineering design systems and manufacturing systems does not represent an ideal integrated system. While data sharing represents an important aspect of an integrated design and manufacturing environment, an equally critical

Systems Integration for Manufacturing Applications Program 1995 Annual Report

April 1, 1996
Author(s)
James E. Fowler, Mark E. Luce
Computer representations for machine tools, cutting tools, and associated hardware are used within a variety of manufacturing software applications. Currently there is no agreed-upon mechanism for representing such manufacturing resource data and as a

Control of Flexible Robot Arm

December 31, 1987
Author(s)
Jonathan W. Lee, L Haynes, B Wang, T M. Tsai
This work is a computer simulation of the control of flexible robot arm. The dynamic equations for a single-link flexible robot arm have been derived rigorously. This arm has two degrees of freedom in rotation and one in translation so that the workspace

Software for an Automated Machining Workstation

September 1, 1986
Author(s)
Thomas R. Kramer, Jay S. Jun
The National Bureau of Standards' Automated Manufacturing Research Facility (AMRF) includes three machining workstations. In the vertical workstation (VWS) metal parts are machined automatically from a design. A simple part may be designed and machined

Hierarchical Control for Robots in an Automated Factory

May 1, 1983
Author(s)
James S. Albus, Tony Barbera, Howard Bloom, M L. Fitzgerald, Ernest Kent, Charles R. McLean
The basic structure of a hierarchical control system is a tree, wherein each computational module has a single superior, and one or more subordinate modules. The top module is where the highest level decisions are made and the longest planning horizon
Displaying 4926 - 4950 of 7112
Was this page helpful?