Results 21 to 30 of about 21,323 (161)

The Integrated Preparation of Porous Tungsten Gradient Materials with a Wide Porosity Range

Metals
Porous tungsten gradient materials with ordered gradient variations in pore size have significant application value in the field of vacuum electronic devices. This work combines tape casting and dealloying methods to achieve the integrated preparation of
Ke Zhu, Hao Jia, Jin Huang, Jian Zhang
doaj   +1 more source

Evolution of interfacial structure of the joints between a tungsten-copper composite and austenitic stainless steel

Materials Research Express, 2021
Joining of CuW70 composite and 0Cr18Ni9 stainless steel was successfully achieved at temperatures 1150 °C with durations from 15 to 90 min after adding a pure copper intermediate layer.
Youting Huang, Yuanfei Zha, Xiaolong Zhou, Xiaowei Li, Wei Li, Qiaohang Guo, Wenzhe Chen, Dongliang Peng   +7 more
doaj   +1 more source

RADIATION SYNTHESIS OF BARIUM MAGNESIUM FLUORIDE ACTIVATED BY TUNGSTEN CERAMICS: STRUCTURE AND LUMINESCENCE

Eurasian Physical Technical Journal
In the work on the example of barium magnesium fluoride activated by tungsten system the existence of possibility of introduction of activators, modifiers into the formed ceramics are shown.
V.M. Lisitsyn, V.A. Vaganov, G.K. Alpyssova, E.V. Kaneva, L.A. Lisitsyna, A.V. Strelkova, I.P. Denisov   +6 more
doaj   +1 more source

Recent progress of photocatalysts based on tungsten and related metals for nitrogen reduction to ammonia

Frontiers in Chemistry, 2022
Photocatalytic nitrogen reduction reaction (NRR) to ammonia holds a great promise for substituting the traditional energy-intensive Haber–Bosch process, which entails sunlight as an inexhaustible resource and water as a hydrogen source under mild ...
Xiangchao Hui, Lijun Wang, Zhibo Yao, Leiduan Hao, Zhenyu Sun   +4 more
doaj   +1 more source

Bond Valence Sum Parameters for Analyzing Pyranopterin Tungsten Enzyme Structures

Molecules
The determination of tungsten oxidation states and W–ligand bond lengths for pyranopterin tungsten enzymes can be negatively impacted by Fourier series termination effects and photodamage/photoreduction in the X-ray beam.
Jesse Lepluart, Martin L. Kirk
doaj   +1 more source

Tungstoenzymes: Occurrence, Catalytic Diversity and Cofactor Synthesis

Inorganics, 2020
Tungsten is the heaviest element used in biological systems. It occurs in the active sites of several bacterial or archaeal enzymes and is ligated to an organic cofactor (metallopterin or metal binding pterin; MPT) which is referred to as tungsten ...
Carola S. Seelmann, Max Willistein, Johann Heider, Matthias Boll   +3 more
doaj   +1 more source

Effect of tungsten-coated diamond content on interfacial microstructure and wear resistance of nickel-based induction composite coatings

Hanjie xuebao
To study the interfacial microstructure and wear resistance of the tungsten-coated diamond reinforced nickel-based composite coating, tungsten-coated diamond particles and nickel-based brazing filler were used as coating materials, and a tungsten-coated ...
Mingyang WANG, Tianran DING, Jianxiu LIU, Jiao YANG, Pan LIU, Quanqi ZUO   +5 more
doaj   +1 more source

Sintering with Sodium Carbonate and Leaching of Wolframite Cakes

Applied Sciences
Focuses on the processing of tungsten raw materials through various operations, including sintering, leaching, purification, and the production of technical tungstic acid.
Bolotpay Baimbetov, Yeleussiz Tazhiyev, Akmaral Yeleuliyeva, Gulnara Moldabayeva, Adelya Dauletbakova, Yelena Yakob, Akbota Taimassova   +6 more
doaj   +1 more source

Synthesis and ammonolysis of nickel and cobalt tungstates and their characterisation

Journal of Saudi Chemical Society, 2016
The synthesis and characterization of NiW and CoW compounds are herein reported. The NiWO4 and CoWO4 samples, successfully synthesised by the hydrothermal method, were treated under NH3 to obtain the metal nitride.
J.L. Rico, M. Albiter, J. Espino, J.S.J. Hargreaves, M. Ostroumov, L.I. Salcedo, K. Wilson   +6 more
doaj   +1 more source

Cerium Oxide-Tungsten Oxide Core-Shell Nanowire-Based Microsensors Sensitive to Acetone

Biosensors, 2018
Gas sensitive cerium oxide-tungsten oxide core-shell nanowires are synthesized and integrated directly into micromachined platforms via aerosol assisted chemical vapor deposition. Tests to various volatile organic compounds (acetone, ethanol, and toluene)
Milena Tomić, Milena Šetka, Ondřej Chmela, Isabel Gràcia, Eduard Figueras, Carles Cané, Stella Vallejos   +6 more
doaj   +1 more source