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'Software Science' revisited: rationalizing Halstead's system using dimensionless units

May 9, 2018

Author(s)

David W. Flater

The set of software metrics introduced by Maurice H. Halstead in the 1970's has seen much scrutiny and not infrequent criticism. This article takes a fresh look at these metrics using quantity calculus (the algebra of units) and a new approach to

A Thorough Analysis of Various Geometries for a Dynamic Calibration Target for Through-wall and Through-rubble Radar

May 4, 2018

Author(s)

John R. Jendzurski, Nicholas G. Paulter Jr., Michael Harner, Ram Narayanan

It is common practice to use a metal conducting sphere for radar calibration purposes. The aspect-independence of a sphere allows for a more accurate and repeatable calibration of a radar than using a nonspherical calibration artifact. In addition, the

Recommended practice for calibrating vacuum gauges of the ionization type

April 27, 2018

Author(s)

James A. Fedchak, Patrick J. Abbott, Jay H. Hendricks, Paul C. Arnold, Neil T. Peacock

This document represents a recommended practice for the calibration of ionization gauges using the comparison method. In this method, ionization gauges are compared to a working standard that has an SI traceable calibration. The ionization gauge is either

How measurement science can improve confidence in research results

April 23, 2018

Author(s)

Anne L. Plant, Chandler A. Becker, Robert J. Hanisch, Ronald F. Boisvert, Antonio M. Possolo, John T. Elliott

The concepts and methods of measurement science can help provide clarity in the definition of reproducibility and its role in the scientific process. The qualities of rigorous research include reproducibility as one component, but there are other important

Virtual Metrology White Paper - INTERNATIONAL ROADMAP FOR DEVICES AND SYSTEMS(IRDS)

April 9, 2018

Author(s)

Ndubuisi G. Orji, Yaw S. Obeng, Carlos Beitia, Supika Mashiro, James Moyne

This white paper provides an overview of virtual metrology (VM) and the benefits it can provide, with cost reduction (both capital expenditure and cycle time) being the primary benefit. The white paper also examines some of the issues preventing wider

NIST Lipidomics Workflow Questionnaire: An Assessment of Community-Wide Methodologies and Perspectives

March 20, 2018

Author(s)

John Bowden, Candice Z. Ulmer, Christina M. Jones, Jeremy P. Koelmel, Richard A. Yost

Introduction Efforts to harmonize lipidomic methodologies have been limited within the community. Here, we aimed to capitalize on the recent NIST lipidomics interlaboratory comparison exercise by implementing a questionnaire that assessed current

Improving Automated Insertion Applications by Restoring Rigid-Body Condition in Point-Based Registration

March 19, 2018

Author(s)

Geraldine S. Cheok, Marek Franaszek, Karl Van Wyk, Jeremy A. Marvel

Accurate knowledge of an object's location is essential in automated robotic applications such as machine tending, pick-and-place operations, and part assembly. Perception systems are used to acquire the object's location, and this information is then

Enhancing optical microscopy illumination to enable quantitative imaging

March 18, 2018

Author(s)

Emil Agocs, Ravikiran Attota

There has been an increasing push to derive quantitative measurements using optical microscopes. While several aspects of microscopy have been identified to enhance quantitative imaging, non- uniform angular illumination asymmetry (ANILAS) across the field

Direct DC 10 V comparison between two Programmable Josephson Voltage Standards made of Niobium Nitride (NbN)-based and amorphous niobium silicon (NbxSi1-x)-based Josephson Junctions

March 15, 2018

Author(s)

Alain Rufenacht, Stephane Solve, M Maruyama, Chiharu Urano, Nobu Kaneko

For the first time, the BIPMs new transportable programmable Josephson voltage standard (PJVS) has been used for an on-site comparison at the National Metrology Institute of Japan (NMIJ), the National Institute of Advanced Industrial Science and

Towards Traceable Transient Pressure Metrology

March 13, 2018

Author(s)

Douglas A. Olson, Haijun Liu, Zeeshan Ahmed, Kevin O. Douglass

Here we detail our progress in developing the infrastructure for traceable transient measurements of pressure and temperature. Towards that end, we have built and characterized a dual diaphragm shock tube that allows us to achieve shock amplitude

NIST Standards for Measurement, Instrument Calibration, and Quantification of Gaseous Atmospheric Species

March 2, 2018

Author(s)

George C. Rhoderick, Michael E. Kelley, Walter R. Miller Jr., James E. Norris, Jennifer Carney, Lyn Gameson, Christina Cecelski, Cassie Goodman, Abneesh Srivastava, Joseph Hodges

There are many gas species present in the atmosphere that are associated with the earths climate. These compounds absorb and emit radiation, a process which is the fundamental cause of the greenhouse effect. The major greenhouse gases in the earths

Test Methods for Exoskeletons  Lessons Learned from Industrial and Response Robotics

March 1, 2018

Author(s)

Roger V. Bostelman, Tsai H. Hong

Exoskeletons are devices that can assist the human wearer's limbs to provide functional, normal or amplified human capabilities. Recent research on exoskeletons has dramatically increased. However, measurements of these devices have yet to show long-term

Optical Fiber Fabry-Perot Micro-Displacement Sensor for MEMS In-plane Motion Stage

February 28, 2018

Author(s)

Yong Sik Kim, Nicholas Dagalakis, Young-Man Choi

Fabry-Perot interferometer sensors have been widely used in Micro-Electro-Mechanical-Systems (MEMS) due to high displacement accuracy and immunity to electromagnetic noises, but they are still limited by micro scale measurement range. In this paper, a

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