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Mostrando 141 - 160 Resultados de 6,796 Para Buscar 'niobio~', tiempo de consulta: 2.53s Limitar resultados
  1. 141
    “…[Image: see text] The palladium-on-carbon (Pd/C)-catalyzed hydrogenative deprotection of the N-benzyl-protecting group was effectively facilitated by the combined use of niobic acid-on-carbon (Nb(2)O(5)/C). Nb(2)O(5)/C is an acidic heterogeneous catalyst prepared from NbCl(5) and activated carbon. …”
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    Online Artículo Texto
    Facile Hydrogenative Deprotection of N-Benzyl Groups Using a Mixed Catalyst of Palladium and Niobic Acid-on-Carbon
  2. 142
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    Novel Development on Superconducting Niobium Film Deposition for RF Applications
  3. 143
    por Weingarten, W
    Publicado 2009
    “…A quantitative description is presented of the non-linear current-voltage response in superconducting niobium cavities for accelerator application. It is based on a fit for a large sample of data from cavity tests of different kind. …”
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    On the Field Dependent Surface Resistance Observed in Superconducting Niobium Cavities
  4. 144
    por Weingarten, Wolfgang
    Publicado 2011
    “…Superconducting cavities made from niobium allow accelerating gradients of about 50  MV/m close to the theoretical limit. …”
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    Field-dependent surface resistance for superconducting niobium accelerating cavities
  5. 145
    “…Measurements on samples show that the electric field is a dominant loss mechanism for niobium films, acting through interface tunneling between localized states in surface oxides and delocalized states in the superconducting niobium.…”
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    Losses in superconducting Niobium Films caused by Interface Tunnel Exchange
  6. 146
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    A search for fractional electric charge on levitated niobium spheres
  7. 147
    Publicado 1978
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    CERN: Textbook charm/Hypernuclei/Niobium-tin route to 8T
  8. 148
    Publicado 1982
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    Saclay : Prototype de dipôle supraconducteur en niobium-étain
  9. 149
    “…The cavities are made of a copper substrate, with a sputter-coated superconductive niobium (Nb) layer, operated at 4.5 K with an accelerating field of 6 MV/m at 10W Radio-Frequency (RF) losses (Q=4.5· 108). …”
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    Niobium Coatings for the HIE-ISOLDE QWR Superconducting Accelerating Cavities
  10. 150
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    Superconducting niobium sputter-coated copper cavities at 1500 MHz
  11. 151
    por Weingarten, Wolfgang
    Publicado 2019
    “…Long standing data from niobium thin-film accelerating cavities will be revisited and analyzed by a modified London model of radio-frequency (RF) superconductivity. …”
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    Fluxon-induced losses in niobium thin-film cavities revisited
  12. 152
    por Saitô, K, Wake, M
    Publicado 1996
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    A new material evaluation method on niobium by magnetization measurement
  13. 153
    “…A systematic study of the superconducting properties of niobium films deposited on the inner wall of copper radiofrequency cavities is presented. …”
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    Study of the surface resistance of niobium sputter-coated copper cavities
  14. 154
    “…Superconducting cavities made by sputter-deposition of a thin niobium film onto copper have proven over the years to be a viable alternative to bulk niobium, the best example being the very successful operation of LEP at 200 GeV. …”
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    High-Q, high gradient niobium-coated cavities at CERN
  15. 155
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    Researches and Experiments on Niobium-Sputtered Superconducting QWR in Peking University
  16. 156
    por Hakovirta, M
    Publicado 2001
    “…The hydrogen content of bulk niobium has been studied by Thermal Desorption Spectroscopy. …”
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    Measurements of hydrogen content in bulk niobium by Thermal Desorption Spectroscopy
  17. 157
    “…The structural differences between stoichiometric and congruent (lithium deficient) lithium niobate single crystals were studied by RBS- and NRA-channeling as well as perturbed angular correlation (PAC) measurements. …”
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    Study of structural differences between stoichiometric and congruent lithium niobate
  18. 158
    por Isagawa, S, Isagawa, K
    Publicado 1980
    “…Limitations of RF field both in He I and He II baths were estimated and discussed on C-band TE011 mode niobium cavities. Calculations were performed by a simulation program under the different assumptions of Kapitza resistance, thermal conductivity and wall thickness, taking lateral heat flow and curvature of the wall into account. (8 refs).…”
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    Limitations of RF field by thermal breakdown in superconducting niobium cavity
  19. 159
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    Super-conducting Niobium Films Produced By Means Of UHV Arc
  20. 160
    por Bacher, J P, Chiaveri, Enrico, Trincat, B
    Publicado 1987
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    Brazing of niobium to stainless steel for UHV applications in superconducting cavities
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