Results 51 to 60 of about 526 (247)

Progress on the optical lattice clock

Comptes Rendus. Physique, 2015
Optical lattice clocks have made significant leaps forward in recent years, demonstrating the ability to measure time/frequency at unprecedented levels. Here we highlight this progress, with a particular focus on research efforts at NIST and JILA. We discuss advances in frequency instability and the characterization of key systematic effects, with a ...
Andrew D. Ludlow, Jun Ye
openaire   +1 more source

The PRIMA Thesaurus for Materials Science and Engineering

Advanced Engineering Materials, EarlyView.
The PRIMA Thesaurus is a structured vocabulary designed to improve how materials science data is described and shared. Developed with input from multiple experts, it enables clear documentation of research workflows, data exchange, and reuse across platforms.
Rossella Aversa, Alexey Boubnov, Dario De Angelis, Catriona Eschke, Maximilian Kabbe, Felix Kraus, Mirco Panighel, Richard Thelen, Davide Valentinis   +8 more
wiley   +1 more source

In Situ Micromechanical Study of Bimodal γ′–γ″ Precipitate Assemblies in Ni–Cr–Al–Nb Superalloy

Advanced Engineering Materials, EarlyView.
A Ni–Cr–Al–Nb superalloy with a bimodal γ′–γ″ precipitate distribution is developed. Composite precipitate assemblies form through heterogeneous nucleation, effectively impeding dislocation motion. Micropillar compression reveals high strength at room and elevated temperatures, governed by precipitate shearing, with coupled faulting mechanisms ...
Ujjval Bansal, Tae‐Hyeok Kang, Pyuck‐Pa Choi, Subin Lee, Christoph Kirchlechner   +4 more
wiley   +1 more source

Accuracy evaluation of an optical lattice clock with bosonic atoms [PDF]

Optics Letters, 2007
We report the first accuracy evaluation of an optical lattice clock based on the 1S0 - 3P0 transition of an alkaline earth boson, namely 88Sr atoms. This transition has been enabled using a static coupling magnetic field. The clock frequency is determined to be 429 228 066 418 009(32) Hz.
Baillard, Xavier, Fouché, Mathilde, Targat, Rodolphe Le, Westergaard, Philip G., Lecallier, Arnaud, Coq, Yann Le, Rovera, Giovanni D., Bize, Sebastien, Lemonde, Pierre   +8 more
openaire   +3 more sources

Inverse Identification of Energy‐Dependent Laser Absorptivity in NiTi Laser Powder‐Bed Fusion via Calibrated Melt Pool Simulation

Advanced Engineering Materials, EarlyView.
A combined experimental–computational framework identifies energy‐dependent laser absorptivity for NiTi in laser powder‐bed fusion, applicable to conduction and transition modes. Single‐track experiments and thermofluid smoothed particle hydrodynamics simulations are coupled through inverse analysis of melt pool geometry.
Mohamadreza Afrasiabi, Hadi Moutablaleh, Ignatius A. Setiawan, Mehrshad Mehrpouya   +3 more
wiley   +1 more source

A battery-powered floating current source of 100 A for precise and fast control of magnetic field

AIP Advances, 2020
In various leading-edge ultracold atom experiments in fields such as quantum simulation, quantum computing, and quantum precision measurement, precise and fast control of the magnetic field is important and a current source with a low noise level and ...
Yu-Meng Yang, Bo Xiao, Wen-Chao Ji, Xuan-Kai Wang, Han-Ning Dai, Yu-Ao Chen, Zhen-Sheng Yuan, Xiao Jiang   +7 more
doaj   +1 more source

Deployment of a transportable Yb optical lattice clock

Optics Letters
We report on the first deployment of a ytterbium (Yb) transportable optical lattice clock (TOLC), commercially shipping the clock 3000 km from Boulder, Colorado, to Washington DC. The system, composed of a rigidly mounted optical reference cavity, an atomic physics package, and an optical frequency comb, fully realizes an ...
Tobias Bothwell, Wesley Brand, Robert Fasano, Thomas Akin, Joseph Whalen, Tanner Grogan, Yun-Jhih Chen, Marco Pomponio, Takuma Nakamura, Benjamin Rauf, Ignacio Baldoni, Michele Giunta, Ronald Holzwarth, Craig Nelson, Archita Hati, Franklyn Quinlan, Richard Fox, Steven Peil, Andrew Ludlow   +18 more
openaire   +4 more sources

Comparison of Triply Periodic Minimal Surface Energy Absorbers Under Uniaxial Compressive Loading

Advanced Engineering Materials, EarlyView.
This study investigates LCD 3D printed Triply Periodic Minimal Surface (TPMS) structures as mechanical energy absorbers. By comparing various base designs and layered combinations under uniaxial compression, it identifies that a Diamond‐Gyroid sandwich structure offers superior performance.
Sergej Grednev, Noah‐Lean Roschlaub, Anne Jung   +2 more
wiley   +1 more source

Experimental realization of an optical second with strontium lattice clocks [PDF]

Nature Communications, 2013
Progress in realizing the SI second had multiple technological impacts and enabled further constraint of theoretical models in fundamental physics. Caesium microwave fountains, realizing best the second according to its current definition with a relative uncertainty of 2-4 × 10(-16), have already been overtaken by atomic clocks referenced to an optical
Le Targat, R., Lorini, L., Le Coq, Y., Zawada, M., Guena, J., Abgrall, M., Gurov, M., Rosenbusch, P., Rovera, D., Nagórny, B., Gartman, R., Westergaard, P., Tobar, M., Lours, M., Santarelli, G., Clairon, A., Bize, S., Laurent, P., Lemonde, P., Lodewyck, J.   +19 more
openaire   +5 more sources

Microstructure, Thermal Transport, and Dry‐Sliding Tribology of Powder‐Metallurgy Al7075 Composites Reinforced With Sol–Gel‐Derived ZnO–rGO Hybrid Nanoparticles

Advanced Engineering Materials, EarlyView.
Sol–gel‐derived ZnO–rGO hybrid nanoparticles enable Al7075 powder‐metallurgy composites to achieve concurrent gains in hardness and thermal conductivity while markedly lowering friction and wear. The hybrid architecture couples ZnO‐based load support with rGO‐assisted lamellar sliding and heat spreading, revealing a promising route toward lightweight ...
Bunyamin Aksakal, Cevher Kursat Macit, Merve Ayık, Hakan Tutumlu   +3 more
wiley   +1 more source