Results 81 to 90 of about 922,402 (315)

VUV absorption spectra of water and nitrous oxide by a double-duty differentially pumped gas filter

Journal of Synchrotron Radiation
The differentially pumped rare-gas filter at the end of the VUV beamline of the Swiss Light Source has been adapted to house a windowless absorption cell for gases. Absorption spectra can be recorded from 7 eV to up to 21 eV photon energies routinely, as
Andras Bodi, Jonas Knurr, Patrick Ascher, Patrick Hemberger, Christoph Bostedt, Andre Al Haddad   +5 more
doaj   +1 more source

Development of a Novel Processing Route for Dispersoid/Precipitation‐Strengthened High Conductive Copper Alloys by Using Metalized Nanoceramics in Additive Manufacturing

Advanced Engineering Materials, EarlyView.
This study explores a process chain to produce dispersoid‐strengthened CuCr1Zr for applications requiring high strength and conductivity. Using gas‐atomized powder and copper‐plated alumina nanoparticles, additive manufacturing is performed via powder bed based additive manufacturing with green and red lasers, followed by heat treatment.
Heinrich von Lintel, Abdelrahman Elsayed, Lukas Mielewczyk, Katja Eichmann, Julia Grothe, Ulrich Krupp, Avinash Hariharan, Katrin Jahns   +7 more
wiley   +1 more source

Relating the optical absorption coefficient of nanosheet dispersions to the intrinsic monolayer absorption [PDF]

arXiv, 2015
The concentration of nanosheet suspensions is an important technological parameter which is commonly measured by optical spectroscopy using the absorption coefficient to transform absorbance into concentration. However for all 2D materials, the absorption coefficient is poorly known, resulting in potentially large errors in measured concentration. Here
arxiv  

An absorption spectrum amplifier for determining gas composition [PDF]

, 1972
Compositions of gas samples are frequently studied by laser absorption spectroscopy. Sensitivity is improved by two orders of magnitude when absorption cell is placed inside an organic-dye laser ...
Bass, A. M., Brown, W., Keller, R. A., Kurylo, M. J., Peterson, N. C., Zalewski, E. F.   +5 more
core   +1 more source

Controlling Vertical Asymmetry of Nanocrystals Through Anisotropic Etching‐Assisted Nanosphere Lithography

Small Structures
Nanosphere lithography, a low‐cost fabrication technique, depends on the self‐assembly of nanoscale features to create nanostructures in a hexagonally close‐packed structure. In this article, the fabrication of 3D nanostructures over a large surface‐area
Arnab Ganguly, Humaira Zafar, Calvyn Travis Howells, Mauro Fernandes Pereira, Gobind Das   +4 more
doaj   +1 more source

Baseline-free scanned-wavelength direct absorption spectroscopy: theoretical analysis and experimental validation [PDF]

arXiv, 2021
Applicability and accuracy of traditional scanned-wavelength direct absorption spectroscopy (SDAS) diagnostic method is largely affected by combustion state such as temperature and pressure. To resolve this problem, an innovative baseline-free scanned-wavelength direct absorption spectroscopy (BF-SDAS) method is proposed in this work.
arxiv  

A Perspective on Powder Metallurgy and Additive Manufacturing of High‐Nitrogen Alloyed Stainless Steels

Advanced Engineering Materials, EarlyView.
This perspective article explores an innovative powder metallurgical approach to producing high‐nitrogen steels by utilizing a mixture of stainless steel and Si3N4. This mixture undergoes hot isostatic pressing followed by direct quenching. The article also examines adapting this method to laser powder bed fusion (PBF‐LB/M) to overcome nitrogen ...
Louis Becker, Felix Radtke, Jonathan Lentz, Simone Herzog, Christoph Broeckmann, Sebastian Weber   +5 more
wiley   +1 more source

The CH₃D Absorption Spectrum Near 1.58 μm: Extended Line Lists and Rovibrational Assignments

Molecules
Monodeuterated methane (CH3D) contributes greatly to absorption in the 1.58 μm methane transparency window. The spectrum is dominated by the 3ν2 band near 6430 cm−1, which is observed in natural methane and used for a number of planetary applications ...
Ons Ben Fathallah, Anastasiya Lembei, Michael Rey, Didier Mondelain, Alain Campargue   +4 more
doaj   +1 more source

A Novel Approach on Rapid Alloy Development of Tool Steels for Laser Powder Bed Fusion by In Situ Alloying

Advanced Engineering Materials, EarlyView.
A novel approach for alloy development in laser powder bed fusion is introduced. Instead of producing massive samples of one composition at a time, prepressed powder bed samples produced from powder mixtures are processed. Guidelines for the selection of precursor powders are developed.
Felix Großwendt, Anna Strauch, Jonathan Lentz, Arne Röttger, Rainer Fechte‐Heinen, Sebastian Weber, Werner Theisen   +6 more
wiley   +1 more source

XANES determination of chromium oxidation states in glasses: comparison with optical absorption spectroscopy [PDF]

arXiv, 2007
The oxidation state of chromium in glasses melted in an air atmosphere with and without refining agents was investigated by Cr K-edge X-ray Absorption Near-Edge Structure (XANES) and optical absorption spectroscopy. A good agreement in the relative proportion of Cr(III) and Cr(VI) is obtained between both methods.
arxiv