Results 71 to 80 of about 79,389 (194)

Proximity effect in Nb-Mo layered films: Transition temperature and critical current dependence on period

, 2011
The behavior of the transition temperature and critical current density for a Mo/Nb repeated bilayer system as a function of the number of periods was explored. The measured values of the transition temperature are compared to the theoretical predictions
A. E. Walker, D. M. Myers, Gallagher W. J., J. B. Lewis, J. Veldhorst, P. R. Broussard, van der Pauw L. J., Z. McElrath   +7 more
core   +1 more source

Evaluation of niobium as candidate electrode material for dc high voltage photoelectron guns

Physical Review Special Topics. Accelerators and Beams, 2012
The field emission characteristics of niobium electrodes were compared to those of stainless steel electrodes using a DC high voltage field emission test apparatus.
M. BastaniNejad, Md. Abdullah Mohamed, A. A. Elmustafa, P. Adderley, J. Clark, S. Covert, J. Hansknecht, C. Hernandez-Garcia, M. Poelker, R. Mammei, K. Surles-Law, P. Williams   +11 more
doaj   +1 more source

Superconducting switch permits measurement of small voltages at cryogenic temperatures [PDF]

, 1968
Dual-coil, superconducting, on-off switch measures small, thermoelectrically generated voltages produced by thermocouples in a liquid helium bath. Placed in a shunt configuration between the thermocouple and the measuring device, the measuring device ...
Govednik, R. E., Huebener, R. P.
core   +1 more source

Systematic improvements in transmon qubit coherence enabled by niobium surface encapsulation

npj Quantum Information
We present a transmon qubit fabrication technique that yields systematic improvements in T 1 relaxation times. We encapsulate the surface of niobium and prevent the formation of its lossy surface oxide.
Mustafa Bal, Akshay A. Murthy, Shaojiang Zhu, Francesco Crisa, Xinyuan You, Ziwen Huang, Tanay Roy, Jaeyel Lee, David van Zanten, Roman Pilipenko, Ivan Nekrashevich, Andrei Lunin, Daniel Bafia, Yulia Krasnikova, Cameron J. Kopas, Ella O. Lachman, Duncan Miller, Josh Y. Mutus, Matthew J. Reagor, Hilal Cansizoglu, Jayss Marshall, David P. Pappas, Kim Vu, Kameshwar Yadavalli, Jin-Su Oh, Lin Zhou, Matthew J. Kramer, Florent Lecocq, Dominic P. Goronzy, Carlos G. Torres-Castanedo, P. Graham Pritchard, Vinayak P. Dravid, James M. Rondinelli, Michael J. Bedzyk, Mark C. Hersam, John Zasadzinski, Jens Koch, James A. Sauls, Alexander Romanenko, Anna Grassellino   +39 more
doaj   +1 more source

Engineering physics of superconducting hot-electron bolometer mixers

, 2017
Superconducting hot-electron bolometers are presently the best performing mixing devices for the frequency range beyond 1.2 THz, where good quality superconductor-insulator-superconductor (SIS) devices do not exist.
Klapwijk, T. M., Semenov, A. V.
core   +2 more sources

Experimental study on the extraction of niobium from crude niobium ore by KOH hydrothermal

矿业科学学报, 2017
Because the crude niobium ore is difficult to be used, according to the composition analysis and phase analysis of crude niobium ore, the KOH hydrothermal method was used to research the dissolution of crude niobium ore and the dissolution of crude ...
Wang Weidong, Li Zhao, Wang Xiaohui, Zheng Shili   +3 more
doaj  

Kapitza resistance cooling of single crystal (111) niobium for superconducting rf cavities

Physical Review Special Topics. Accelerators and Beams, 2010
The use of large grains or single crystal niobium to improve the Q factor of superconducting rf cavities for particle accelerators, is presently under study.
Jay Amrit, Claire Z. Antoine
doaj   +1 more source

Method of forming shrink-fit compression seal [PDF]

, 1977
A method for making a glass-to-metal seal is described. A domed metal enclosure having a machined seal ring is fitted to a glass post machined to a slight taper and to a desired surface finish. The metal part is then heated by induction in a vacuum.
Podgorski, T. J.
core   +1 more source

Effect of Heat Treatment on the Microstructure, Impact Toughness and Hardness of High-Chromium White Cast Iron with Added Niobium and Manganese Minerals

Al-Khawarizmi Engineering Journal
In this work, manganese and niobium were added to high-chromium white cast iron, from which drilling and grinding tools were made. Two melts with different proportions of manganese and niobium (manganese 2.75% and niobium 0.49%, manganese 3.5% and ...
Ali Hatra, Ahmad Salamah, Nassim Aldaher
doaj   +1 more source

Niobium hyperfine structure in crystal calcium tungstate [PDF]

A study of the niobium hyperfine structure in single crystal calcium tungstate was made by the combination of the technique of electron paramagnetic resonance and electron nuclear double resonance (EPR/ENDOR).
Kikuchi, C., Tseng, D. L.
core   +1 more source