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Sensors (Basel) 2022 May 31;22(11). Epub 2022 May 31.

College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China.

In this study, the circular Gaussian spot emitted by a laser light source is shaped into a rectangular flat-top beam to improve the scanning efficiency of a selective laser sintering scanning system. A CO laser with a power of 200 W, wavelength of 10.6 μm, and spot diameter of 9 mm is shaped into a flat-top spot with a length and width of 0. Read More

Opt Express 2021 Aug;29(16):25697-25708

In this paper, we demonstrate a self-homodyne coherent system with a significantly narrowed effective linewidth using optical carrier recovery based on stimulated Brillouin scattering (SBS), employing only coarse path length matching. The effective linewidth of the SBS-based receiver system is reduced from 75 kHz to less than 2 kHz, which is estimated by Lorentzian fitting of power spectra, and confirmed by simulation results of the tolerance window length for phase noise compensation (PNC) with different linewidth. Both experimental and numerical studies on the tracking requirements on PNC algorithms confirm effective linewidth reduction to this level, and show a 32x relaxation of the phase recovery tracking window length. Read More

Phys Chem Chem Phys 2021 Mar 19;23(12):7088-7100. Epub 2021 Mar 19.

Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium.

Studying the structural environment of the V ions doped in the metal-organic framework (MOF) DUT-5(Al) ((AlOH)BPDC) with electron paramagnetic resonance (EPR) reveals four different vanadium-related spectral components. The spin-Hamiltonian parameters are derived by analysis of X-, Q- and W-band powder EPR spectra. Complementary Q-band Electron Nuclear DOuble Resonance (ENDOR) experiments, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray spectroscopy (EDX), X-Ray Diffraction (XRD) and Fourier Transform InfraRed (FTIR) measurements are performed to investigate the origin of these spectral components. Read More

PLoS One 2020 24;15(11):e0241788. Epub 2020 Nov 24.

Institute of Earth Sciences, University of Lausanne, Lausanne, Switzerland.

Given that all in-situ analytical techniques have a non-zero beam size, all measured profiles, resulting from diffusion or otherwise, will be artefactually elongated to some degree. Profiles where the total length over which the concentration changes approaches the resolution of the analytical technique likely suffer from serious convolution; the measured profiles may be considerably elongated relative to the true profile. Resolving this effect is non-trivial, except for some specific combinations of profile type and beam geometry. Read More

Sci Rep 2020 Oct 7;10(1):16701. Epub 2020 Oct 7.

Department of Physics Education, Chonnam National University, Gwangju, 61186, Republic of Korea.

The effect of inhomogeneous quantum dot (QD) size distribution on the electronic transport of one-dimensional (1D) QD chains (QDCs) is theoretically investigated. The non-equilibrium Green function method is employed to compute the electron transmission probabilities of QDCs. The ensemble averaged transmission probability shows a close agreement with the conductivity equation predicted by Anderson et al. Read More