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Displaying 4976 - 5000 of 73461

Control of the Frequency Comb From a Mode-Locked Erbium Doped Fiber Laser

October 12, 2021
Author(s)
J Rauschenberger, T M. Fortier, D J. Jones, Jun Ye, Steven T. Cundiff
We show that a stretched-pulse mode-locked fiber laser produces a well-defined frequency comb, providing a compact source of frequency combs and allowing comb-based optical frequency metrology to be extended into the 1.55 m region. This is achieved by

Controllable Catastrophe X-Ray Focusing

October 12, 2021
Author(s)
S M. Durbin, Terrence J. Jach, S. Kim, J. A. Aust
The interaction of waves with inhomogeneous media leads to the natural focusing of light, the channelling of waves into stable caustics such as the pattern of sunlight seen at the bottom of a rippled swimming pool. These effects are also found in surface

Coupling Grain Boundary Motion to Shear Deformation

October 12, 2021
Author(s)
Yuri Mishin, A Suzuki, John W. Cahn
Molecular dynamics (MD) simulations confirm that normal grain boundary (GB) motion must often be coupled to tangential translation of grains and will then produce shear deformation of the lattice traversed by the GB. Conversely, shear stresses applied to a

Creation of Macroscopic Superposition States from Arrays of Bose-Einstein Condensates

October 12, 2021
Author(s)
J A. Dunningham, Karen G. Burnett, R Roth, William D. Phillips
We consider how macroscopic quantum superpositions may be created from arrays of Bose-Einstein condensates. We study a system of three condensates in Fock states, all with the same number of atoms and show that this has the form of a highly entangled

Critical Behavior of a Strain Percolatin Model for Metals with Unstable Locks

October 12, 2021
Author(s)
Y Shim, Lyle E. Levine, R M. Thomson, M Savage
Using a strain percolatin model proposed for the transport of mobile dislocations through a dislocation cell structure in a deforming metal, we have further explored the critical behavior of the model when there are some unstable locks present in the

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
Displaying 4976 - 5000 of 73461
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