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Displaying records 31 to 40 of 86 records.
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31. Fiber orientation angle effects in machining of unidirectional CFRP laminated composites
Topic: Metrology
Published: 6/13/2014
Authors: Viswanathan Madhavan, Gary Lipczynski, Brandon M Lane, Eric Paul Whitenton
Abstract: Experiments were carried out at the National Institute of Standards and Technology, in collaboration with The Boeing Company, to obtain force and temperature data as a function of feed, speed and fiber orientation angle (FOA), for validation of finit ...

32. Gas Flowmeter Calibrations with the 34 L and 677 L PVTt Standards
Series: Special Publication (NIST SP)
Topic: Metrology
Published: 6/23/2004
Authors: John D Wright, Aaron N Johnson, Michael R Moldover, Gina M Kline
Abstract: This document provides a description of the 34 L and 677 L pressure, volume, temperature, and time (PVTt) primary gas flow standards operated by the National Institute of Standards and Technology (NIST) Fluid Flow Group. These facilities are used to ...

33. Ground Truth Systems for Object Recognition and Tracking
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7923
Topic: Metrology
Published: 3/29/2013
Authors: Afzal A Godil, Roger D. Eastman, Tsai Hong Hong
Abstract: In this report we discuss different types of ground-truth systems used for evaluation of object recognition and tracking systems in industrial manufacturing environments. We discuss three main ways for acquiring ground truth for object recognitio ...

34. Ground Truth for Evaluating 6 Degrees of Freedom Pose Estimation Systems
Topic: Metrology
Published: 3/28/2012
Authors: Jeremy A Marvel, Joseph A Falco, Tsai Hong Hong
Abstract: Systems developed to estimate poses of objects in 6 degrees of freedom (6DOF) Cartesian space (X, Y, and Z coordinates plus roll, pitch, and yaw) are reliant on the vendors' own processes to determine performance and measurement accuracy. These pract ...

35. Improved Nozzle Manifold for Gas Flow Calibrations
Topic: Metrology
Published: 6/20/2012
Authors: Aaron N Johnson, Chunhui Li, John D Wright, Gina M Kline, Christopher J. Crowley
Abstract: We developed a new nozzle manifold that reduced the uncertainty of flow calibrations from 0.09 % to as low as 0.074 % for flows of air up to 0.84 kg/s (43 000 L/min at reference conditions of 101.325 kPa and 293.15 K). The nozzle manifold also reduc ...

36. Inexpensive Ground Truth and Performance Evaluation for Human Tracking using multiple Laser Measurement Sensors
Topic: Metrology
Published: 10/27/2010
Authors: William P Shackleford, Tsai Hong Hong, Tommy Chang
Abstract: This paper will describe a flexible and inexpensive method of obtaining ground truth for the evaluation of Human Tracking systems. It is expected to be appropriate for evaluating systems used to allow robots and/or autonomous vehicles to operate safe ...

37. Influence of room temperature control system on AFM imaging
Topic: Metrology
Published: 10/1/2009
Authors: Joseph Fu, Wei Chu, Theodore Vincent Vorburger
Abstract: As technology progresses, the control of environment for experiments is also getting more sophisticated; such as the control of lab temperature and vibration. Temperature controlled within ± 0.25° C for a general purpose lab is common place. We illus ...

38. Information Required for Dimensional Measurement
Topic: Metrology
Published: 7/27/2012
Authors: John A Horst, Curtis Brown, Robert Brown, Larry Maggiano, K Summerhays, Thomas Rollin Kramer
Abstract: Much work has been done by standards organizations to model dimensional measurement information in digital formats, but the work done has revealed that standard digital formats from upstream processes are currently insufficient to enable the automati ...

39. Interoperability and the DMIS experience
Topic: Metrology
Published: 10/30/2009
Author: John A Horst
Abstract: Because they enable true interoperability, information exchange standards can help manufacturers reduce cost and improve product quality, but only if the standards are developed and implemented correctly. We will answer questions manufacturers and su ...

40. Kinematic Modeling and Calibration of a Flexure Based Hexapod Nanopositioner
Topic: Metrology
Published: 8/21/2012
Authors: Hongliang Shi, Hai-Jun Su, Nicholas G Dagalakis, John A Kramar
Abstract: This paper covers the kinematic modeling of a flexure-based, hexapod nanopositioner and a new method of calibration for this type of nanopositioner. This six degrees of freedom tri-stage nanopositioner can generate small displacement, high-resolution ...

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