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Marola Silvia Fiore Gianluca Battezzati Livio 《Metallurgical and Materials Transactions A》2023,54(2):624-633
Metallurgical and Materials Transactions A - In this work, melt-spun ribbons of AlSi10Mg added with modifiers (Er, Sr, or nano-TiB2) were produced to investigate the combined effect of modification... 相似文献
979.
J Briscoe NC Rogers BA Witthuhn D Watling AG Harpur AF Wilks GR Stark JN Ihle IM Kerr 《Canadian Metallurgical Quarterly》1996,15(4):799-809
The receptor-associated protein tyrosine kinases JAK1 and JAK2 are both required for the interferon (IFN)-gamma response. The effects of expressing kinase-negative JAK mutant proteins on signal transduction in response to IFN-gamma in wild-type cells and in mutant cells lacking either JAK1 or JAK2 have been analysed. In cells lacking endogenous JAK1 the expression of a transfected kinase-negative JAK1 can sustain substantial IFN-gamma-inducible gene expression, consistent with a structural as well as an enzymic role for JAK1. Kinase-negative JAK2, expressed in cells lacking endogenous JAK2, cannot sustain IFN-gamma-inducible gene expression, despite low level activation of STAT1 DNA binding activity. When expressed in wild-type cells, kinase-negative JAK2 acts as a dominant-negative inhibitor of the IFN-gamma response. Further analysis of the JAK/STAT pathway suggests a model for the IFN-gamma response in which the initial phosphorylation of JAK1 and JAK2 is mediated by JAK2, whereas phosphorylation of the IFN-gamma receptor is normally carried out by JAK1. The efficient phosphorylation of STAT 1 in the receptor-JAK complex may again depend on JAK2. Interestingly, a JAK1-dependent signal, in addition to STAT1 activation, appears to be required for the expression of the antiviral state. 相似文献
980.
R. Leoni A. Gaggero F. Mattioli M. G. Castellano P. Carelli F. Marsili D. Bitauld M. Benkahoul F. Lévy A. Fiore 《Journal of Low Temperature Physics》2008,151(1-2):580-584
Electrical and optical characterization has been performed on several superconducting single photon detectors (SSPDs) consisting
of meanders made of ultrathin NbN films. The NbN films, with thickness ranging from 150 nm to 3 nm, were deposited by dc magnetron
sputtering on MgO substrates kept at temperature T=400°C. This deposition process carried out at low temperature opens the way of monolithic integration with other photonic
devices. The superconducting properties of NbN films and the critical design parameters that affect the quantum efficiency
(QE) have been optimized. In particular, by measuring the switching current distribution of each stripe of the meander the
process uniformity has been studied. Optical measurements on the fabricated SSPDs showed a QE ≈20% at 4.2 K for photons with
a wavelength of 1300 nm.
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