Results 101 to 110 of about 922,402 (315)

Gas Accretion Traced in Absorption in Galaxy Spectroscopy

, 2016
The positive velocity shift of absorption transitions tracing diffuse material observed in a galaxy spectrum is an unambiguous signature of gas flow toward the host system.
A. Coil, A. M. Martin, A. M. Quider, A. M. Quider, A. T. Deller, B. D. Oppenheimer, B. J. Weiner, C. C. Steidel, C. C. Steidel, C. L. Martin, C. L. Martin, D. M. Crenshaw, D. Nelson, E. Floc’h Le, F. Walter, G. Barro, G. G. Kacprzak, H. B. Krug, H. Fathivavsari, H.-W. Chen, J. Bergeron, J. H. Gorkom van, J. K. Werk, J. Li, J. T. Allen, J. Tumlinson, J. X. Prochaska, K. A. Kornei, K. Bundy, K. H. R. Rubin, K. H. R. Rubin, K. H. R. Rubin, M. Ajiki, M. Davis, M. Davis, M. Dessauges-Zavadsky, M. Pettini, M. S. Westmoquette, M. Sarzi, M. Vogelsberger, N. Lehner, N. Lehner, P. B. Hall, P. B. Hall, P. L. Shopbell, R. Barvainis, R. Davé, S. L. Ellison, T. A. Davis, T. Goerdt, T. M. Heckman, T. Sato, W. D. Langer, Y.-M. Chen   +53 more
core   +1 more source

Adjustable Plasmonic Core–Shell Nanoparticles for Personalized Color Vision Correction

Advanced Engineering Materials, EarlyView.
This study introduces a personalized solution for correcting color vision deficiency (CVD) by embedding tunable core‐shell metal nanoparticles—a common nanotechnology—into contact lenses. By customizing the nanoparticles’ optical properties to filter specific wavelengths, these lenses address individual visual impairments, enhancing color ...
Hyeonah Lee, Yejin Park, Mijin Kim, Myungsung Sim, Hyeran Noh   +4 more
wiley   +1 more source

Nonlinear absorption study in four and five energy level systems [PDF]

arXiv, 2018
Nonlinear absorption in four and five energy level systems have been studied with the aid of steady-state rate equation approach. We report on the tunability of saturable and reverse saturable absorption as a function of spectroscopic parameters (lifetimes and absorption cross-sections).
arxiv  

Calibration-Free WMS Using a cw-DFB-QCL, a VCSEL, and an Edge-Emitting DFB Laser With In-Situ Real-Time Laser Parameter Characterization

IEEE Photonics Journal, 2017
This paper presents a detailed experimental wavelength modulation spectroscopy approach and demonstrates its applicability to various types of semiconductor lasers in the near infrared and mid-infrared.
Abhishek Upadhyay, David Wilson, Michael Lengden, Arup L. Chakraborty, George Stewart, Walter Johnstone   +5 more
doaj   +1 more source

Large‐Scale Interlaboratory Study Along the Entire Process Chain of Laser Powder Bed Fusion: Bridging Variability, Standards, and Optimization across Metals and Polymers

Advanced Engineering Materials, EarlyView.
What happens when 32 labs join forces to study nanoparticle‐modified powders? A data‐driven journey through laser powder bed fusion—now openly accessible for the entire additive manufacturing community—is studied. Laser powder bed fusion is a cornerstone technology for additive manufacturing (AM) of metals and polymers, yet challenges in achieving ...
Ihsan Murat Kuşoğlu, Sunidhi Garg, Arvid Abel, Prasanna V. Balachandran, Stephan Barcikowski, Louis Becker, Jan-Simeon Bernsmann, Jonas Boseila, Christoph Broeckmann, Mert Coskun, Malte Dreyer, Mark East, Mark Easton, Nils Ellendt, Stan Gann, Bilal Gökce, Mareen Goßling, Joachim Greiner, Piotr Gruber, Moritz Grünewald, Kopila Gurung, Nick Hantke, Florian Hengsbach, Hannes Holländer, Brecht Van Hooreweder, Kay-Peter Hoyer, Yajiang Huang, Florian Huber, Olaf Kessler, Burçin Özbay Kısasöz, Stefan Kleszczynski, Ebubekir Koc, Tomasz Kurzynowski, Arno Kwade, Simon Leupold, Dongmei Liu, Felix Lomo, Arne Lüddecke, Gerrit A. Luinstra, David A. Mauchline, Fabian Meyer, Lars Meyer, Peter Middendorf, Stefan Nolte, Michał Olejarczyk, Ludger Overmeyer, Andrij Pich, Sebastian Platt, Felix Radtke, Roland Ramm, Silja-Katharina Rittinghaus, Richard Rothfelder, Johannes Rudloff, Mirko Schaper, Marie Luise Scheck, Johannes Henrich Schleifenbaum, Michael Schmidt, Jan T. Sehrt, Yvonne P. Shabanga, Alexander Sommereyns, Rabea Steuer, Layla Shams Tisha, Anastasiya Toenjes, Christopher Tuck, Adrian Vaghar, Bey Vrancken, Zhengze Wang, Sebastian Weber, Jan Wegner, Bai-Xiang Xu, Yangyiwei Yang, Duyao Zhang, Evgeny Zhuravlev, Anna R. Ziefuss   +73 more
wiley   +1 more source

Ultrafast transient absorption spectroscopy: principles and applications [PDF]

, 2016
The study of photophysical and photochemical processes crosses the interest of many fields of research in physics, chemistry and biology. In particular, the photophysical and photochemical reactions, after light absorption by a photosynthetic pigment ...
López-Navarrete, Juan Teodomiro, Moreno Oliva, María   +1 more
core  

Laser Additive Manufacturing of Oxide‐Dispersion‐Strengthened Steels: A Simulation‐Based Comparison Between Powder Bed Fusion and Direct Energy Deposition

Advanced Engineering Materials, EarlyView.
Controlling the size and distribution of dispersoids is essential for optimizing the performance of oxide‐dispersion‐strengthened steels. This study focuses on nanoparticle dispersion and agglomeration during laser additive manufacturing of Fe20Cr alloy reinforced with ZrO 2 nanoparticles. Utilizing multiphysics phase‐field simulations and nanoparticle
Somnath Bharech, Yangyiwei Yang, Timileyin David Oyedeji, Prasanth Bondi, Mareen Goßling, Bilal Gökce, Bai‐Xiang Xu   +6 more
wiley   +1 more source

Achievement of Sub‐Diffractive Detection Depth in Absorption Spectroscopy Using Excitation from an Upconverting Particle

Advanced Photonics Research
Conventionally, a collimated visible laser beam can only be focused to a transverse region volume with a waist of about 200 nm and an axial waist of about 1200 nm due to the wave nature of light.
Jayesh Goswami, Snigdhadev Chakraborty, Gokul Nalupurackal, Srestha Roy, Basudev Roy   +4 more
doaj   +1 more source

Measurement of the Magnetic Field in a Linear Magnetized Plasma by Tunable Diode Laser Absorption Spectroscopy

Atoms, 2019
Tunable diode laser absorption spectroscopy (TDLAS) is a commonly used technique to measure the temperature and density of atoms or molecules in a gas.
Sven Dickheuer, Oleksandr Marchuk, Tsanko Vaskov Tsankov, Dirk Luggenhölscher, Uwe Czarnetzki, Wojciech Gromelski, Stephan Ertmer, Arkadi Kreter   +7 more
doaj   +1 more source

Tribology of ZrC Coatings and Spherical Tips Acquired with Extraordinarily Stiff, Metal Atomic Force Microscopy Probes

Advanced Engineering Materials, EarlyView.
In this research, ZrC coatings are evaluated against various counterprobes at the microscale using novel super‐stiff atomic force microscopy cantilevers. The chemical composition of the coating is shown to be an important factor influencing coating hardness and Young's modulus, while surface roughness, counterprobe hardness, and surface energy are the ...
Piotr Jenczyk, Marcin Michałowski, Bogdan Warcholiński, Michał Milczarek, Adam Gilewicz   +4 more
wiley   +1 more source