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Displaying 26226 - 26250 of 73970

Fatigue Pre-Cracking Curved Wide Plates in Bending

September 27, 2010
Author(s)
Mark D. Richards, Timothy S. Weeks, Joseph D. McColskey, Bo Wang, Yong-Yi Wang
In support of using high strength steels for strain-based design of pipeline, curved wide plate (CWP) tests in tension are being performed on API 5L X100 pipes of 36-inch (916-mm) diameter and 0.75-inch (19-mm) wall thickness. The CWP tests are being used

MEASUREMENT OF CTOA OF PIPE STEELS USING MDCB AND DWTT SPECIMENS

September 27, 2010
Author(s)
Christopher N. McCowan, S. Xu, W. R. Tyson, R. Eagleson, Elizabeth S. Drexler, J. D. McColskey, Philippe P. Darcis
Two types of specimen for crack tip opening angle (CTOA)measurement have been investigated for pipeline applications,i.e., the modified double cantilever beam (MDCB) (at NIST)and the drop-weight tear test (DWTT) specimen (at CANMET). Results of effects of

Revised interpretation of the Na I EUV absorption spectrum

September 27, 2010
Author(s)
Alexander Kramida
Spectral data for neutral sodium were recently compiled by Sansonetti (2008 J. Phys. Chem. Ref. Data 37 1659). In that compilation, some of the energy levels of the 2p53snl configurations were quoted from the studies of the absorption spectrum in the

SE(T) Testing of Pipeline Welds

September 27, 2010
Author(s)
Elizabeth S. Drexler, Yong-Yi Wang, Jeffrey W. Sowards, Marc Dvorak
Single edge-notch tension (referred to as SE(T) or SENT) tests are increasingly being used in the pipeline community, as they are a laboratory-scale fracture toughness test, capable of being performed on linepipe steels and welds. The constraint and

Spatial Coherence in Electron-Beam Patterning

September 27, 2010
Author(s)
Ginusha M. Perera, Gila E. Stein, James Alexander Liddle
We demonstrate a simple method to identify noise sources in electron-beam systems and accurately quantify the resulting errors in feature placement. Line gratings with a 46 nm average pitch were patterned with electron-beam lithography (EBL) and measured

Relativity and Optical Clocks

September 24, 2010
Author(s)
Chin-Wen Chou, David Hume, Till P. Rosenband, David J. Wineland
Albert Einstein's theory of relativity forced us to alter our concepts of reality. One of the more startling outcomes of the theory is that we have to give up our notions of simultaneity. This is manifest in the so-called twin paradox in which a twin

Toward Spin Squeezing with Trapped Ions

September 23, 2010
Author(s)
John J. Bollinger, Hermann Uys, Michael Biercuk, Joseph W. Britton
Building robust instruments capable of making interferometric measurements with precision beyond the standard quantum limit remains an important goal in many metrology laboratories. We describe here the basic concepts underlying spin squeezing experiments

A Framework for Multi-Resolution Modeling of Sustainable Manufacturing

September 22, 2010
Author(s)
Sanjay Jain, Deogratias Kibira
This paper proposes a multi-resolution framework for application of system dynamics modeling to sustainable manufacturing. Sustainable manufacturing involves interaction of four complex systems namely manufacturing, environmental, financial, and social

Peer Review Report 2010

September 22, 2010
Author(s)
Thomas A. Siewert, Robert Smith, Theresa Bell, Joseph D. McColskey, Richard J. Fields
The Pipeline and Hazardous Materials Safety Administration s Pipeline Safety Research and Development (R&D) Program held a structured peer review of active research projects in April 2010. The peer review panel consisted of twelve government and industry
Displaying 26226 - 26250 of 73970
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