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Displaying 3676 - 3700 of 74638

Critical Size for Shape Transition and Size Evolution of Ge Islands on Si (100)

October 12, 2021
Author(s)
B Liu, C L. Berrie, J Bright, S R. Leone
Atomic force microscopy is used to study the molecular beam epitaxy of Ge on Si(100) at different growth temperatures and coverages. Forgrowth temperatures ranging from 750 K to 900 K, at the early coarsening stage, an island shape transition is observed

Cross Sections for Ionization of Mo and Mo+ by Electron Impact

October 12, 2021
Author(s)
D H. Kwon, Y J. Rhee, Yong Sik Kim
Theoretical cross sections for electron-impact ionization of the neutral Mo Atom and Mo+ ion are reported. Both Mo and Mo+ have many metastable levels near the ground level. We calculated ionization cross sections from the ground and two lowest metastable

Cruising Through Molecular Bound-State-Manifolds With Radio-Frequency

October 12, 2021
Author(s)
F Lang, P Van der Straten, B Brandstatter, G Thalhammer, K Winkler, Paul S. Julienne, R Grimm, J Hecker Denschlag
The emerging field of ultracold molecules with their rich internal structure is currently attracting a lot of interest. Various methods have been developed to produce ultracold molecules in pre-set quantum states. For future experiments it will be

Crystal Structure of Escherichia coli Protein ybgI

October 12, 2021
Author(s)
Jane E. Ladner, G Obmolova, A Teplyakov, P P. Khil, R D. Camerini-Otero, G L. Gilliland
The crystal structure determination of E. coli protein ybgI was undertaken as part of a structural genomics effort (http://s2f.carb.nist.gov) in order to assist with the functional assignment of the protein. The protein encoded by the ybgI gene of

Crystal Structure of the Escherichia Coli CobW Protein Suggests a GTP-Dependent Regulatory Function in the Cobalamin Synthesis Pathway

October 12, 2021
Author(s)
P P. Khil, R D. Camerini-Otero, A Teplyakov, G Obmolova, A J. Howard, G L. Gilliland
The crystal structure determination of E. coli CobW was undertaken as part of a structural genomics effort (http://s2f.carb.nist.gov) in order to assist with the functional assignment of the protein. The CobW protein from E. coli was cloned, expressed, and

Cure Monitoring of Hydrosilation-Curable Silicones by Fluorescence Spectroscopy

October 12, 2021
Author(s)
Y Hotta, K Komatsu, Francis W. Wang
Cure monitoring of hydrosilation is needed to control the fabrication of medical devices from hydrosilation-curable silicones. The fluorescence spectrum of a probe with one or more unsaturated bonds in its chromophore changes when the probe reacts with a

Data Standards in Proteomics: Promises and Challenges

October 12, 2021
Author(s)
Veerasamy Ravichandran, Ram D. Sriram, G L. Gilliland, S Srivastava
Rapid advances in the field of proteomics are yielding abundant data in many formats that, because of the vast quantity and complexity, are becoming increasingly difficult to analyze. A strategic objective of streamlining the transfer of knowledge and

Data-Driven and Peak-Based Feature Selection In Serum Protein Mass Spectrometry

October 12, 2021
Author(s)
Walter S. Liggett Jr, Peter E. Barker, O J. Semmes, L H. Cazares
Consider functional canonical correlation analysis (CCA) applied to disjoint sections of lengthy protein mass spectra for the purpose of finding long-distance correlation structure. The relations between the CCA weight functions, which are derived from the

Descriptive Fractography on All-Ceramic Dental Crown Failures

October 12, 2021
Author(s)
Susanne Scherrer, Janet Quinn, George D. Quinn, HW A. Wiskott
Descriptive fractography has been applied to three dental ceramic crown failures for understanding the fracture process and assessing possible design inadequacies. In two cases, the original broken parts could be recovered for stereo and SEM analysis. In

Design and Evaluation of Large Aperture Gallium Fixed Point Blackbody

October 12, 2021
Author(s)
V B. Khromchenko, Sergey Mekhontsev, Leonard Hanssen
To complement existing water bath blackbodies which are now serving as NIST primary standard sources in the temperature range from 15 C to 75 C, a gallium fixed point blackbody has been recently built. The main objectives of the project included creating

Detection of Smoke From Microgravity Fires

October 12, 2021
Author(s)
D L. Urban, DeVon Griffin, Gary Ruff, Thomas Cleary, Jiann C. Yang, George W. Mulholland, Zeng-guang Yuan
The history and current status of spacecraft smoke detection is discussed including a review of the state of understanding of the effect of gravity on the resultant smoke particle size. The results from a spacecraft experiment (Comparative Soot Diagnostics

Determination of the Complex Modulus of a Supported Ultra-Thin Polymer Film

October 12, 2021
Author(s)
Christopher C. White, Wen-Li Wu
A novel technique to quantitatively measure the complex modulus of ultra-thin polymer films (sub micron) is described. This technique employs a new mechanical impedance expression developed from a two-layer viscoelastic media model. This result is combined

Development and Interpretation of the Security Rating Index

October 12, 2021
Author(s)
Jonathan Sylvie, Stephen R. Thomas, Sang-Hoon Lee, Robert E. Chapman
This article is a follow-on publication to Addressing Security in the Early Stages of the Project Life Cycle. It details the development and interpretation of the Security Rating Index (SRI), which provides a means of quantitatively assessing the level of
Displaying 3676 - 3700 of 74638