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  • 1
    Electronic Resource
    Electronic Resource
    Internal Friction of Hydrogenated Ti (Ni,Cu) Shape Memory Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 319 (Sept. 2006), p. 39-44 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Effects of hydrogen doping on the internal friction (IF) of ternary Ti50Ni50-xCux (x=15, 20,25)[removed info] shape memory alloys, prepared by rolling and annealing laminating Ti and Ni-Cu alloy sheets,have been measured with a damping mechanical analyzer in a forced bending oscillation mode attemperatures from 173K to 423K at three frequencies, 0.1, 1 and 5Hz. The effects of hydrogendoping on IF are common to the three alloys: a hydrogen IF peak appears at around 260K; the IFpeak value (tanφ) increases rapidly with increasing hydrogen concentration up to tanφ=0.03 at0.5at% and then decreases; the peak temperature also increases rapidly and then gradually decreases.From the frequency dependence of the peak temperature, the activation energy E and thepre-exponential factor ω0 have been analyzed to be E=0.6-0.7eV and ω0=1013-14s-1. The origin of thehydrogen IF is interpreted to be the Snoek-Koester effect due to interaction of twin boundarydislocations and segregated hydrogen atoms. Effects of hydrogen on mechanical properties of thealloys have also been studied
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.319.39.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Susceptibility of Damping Behavior to the Solidification Condition in the As-Cast M2052 High-Damping Alloy (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 319 (Sept. 2006), p. 67-72 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: M2052 alloy is a MnCu based high damping alloy that shows high damping capacity andthe superior workability. In the present work, the microstructure and damping behavior of the alloy indifferent solidification cooling rates are investigated with directionally cast alloy plate. For thevariation of solidification cooling rate in the range of 250~10K/s, the secondary dendrite arm spacingof the cast alloy changes from 4 to 18mm and grain size varies in the range of 100~200mm except thesurface regions and center regions in the cast plate. As compared to the worked and heat treated alloy,the as-cast alloy shows a high temperature damping above the average phase transformationtemperature of the alloy irrespective to the solidification cooling rate. On the other hand, a higherdamping peak is observed in the cast alloy which is attributed much to the twin boundary damping,however, the magnitudes of the damping peak are found to be varied corresponding to the respectivesolidification conditions
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.319.67.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Inhibition of Muscarinic-Coupled Phosphoinositide Hydrolysis by N-Methyl-d-Aspartate Is Dependent on Depolarization via Channel Activation (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 54 (1990), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The intent of this work was to elucidate the mechanism by which N-methyl-d-aspartate (NMDA) receptor agonists inhibit a second messenger system, namely, the stimulation of phosphoinositide (PI) hydrolysis activated by muscarinic cholinergic receptor agonists. NMDA inhibited cholinergic stimulation of PI hydrolysis in a dose- and time-dependent manner. NMDA exerts this effect indirectly through channel activation, because both MK-801 and N-[1-(2-thienyl)cyclohexyl]piperidine (TCP) prevented this action. Prevention of the NMDA effect by removal of sodium, but not calcium, from the incubation buffer suggested that depolarization may be the responsible mechanism. Depolarization alone proved sufficient to inhibit cholinergic activation of PI hydrolysis, because both veratridine and an elevated extracellular potassium level inhibited cholinergic stimulation of PI hydrolysis. The effect of NMDA appeared to require sodium flux through NMDA channels rather than through voltage-dependent sodium channels, because tetrodotoxin failed to inhibit the effect of NMDA. In correlative electrophysiologic experiments, NMDA profoundly inhibited evoked excitatory postsynaptic potentials and population action potentials of CA1 neurons, an effect almost certainly due to depolarization. The dose and time course of the electrophysiologic effects correlated well with the biochemical effects. Taken together, the data support the assertion that NMDA receptor activation inhibits PI hydrolysis by depolarization mediated by sodium flux through NMDA channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1990.tb01199.x
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic Properties of Fe-Pt Nanoparticle Protected by PVP Polymer (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 2131-2134 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Annealing effect on the magnetic properties of Fe-Pt nanoparticle was investigated. Fe-Pt nanoparticles were synthesized by the chemical reduction of H2PtCl6 and the decomposition of Fe(CO)5 in the presence of PVP polymers. The samples were annealed at several temperatures from 350℃ to 600℃ and the structural and magnetic properties were studied by TEM, XRD and magnetization measurements. FePt nanoparticles as-synthesized showed super-paramagnetism and annealed samples at temperatures more than 400℃, ferromagnetism. The crystal structure ofas-synthesized sample was disordered fcc, but chemically ordered fct, when it was annealed at more than 400℃. The annealing effects are the concatenation or agglomeration of nanoparticles accompanied with the increase in particle diameter and with the ordering of the FePt superlattice. The critical diameter for emergence of ferromagnetism of FePt particle has been considered to be 3.6 to 5.6 nm in mean diameter, under the existence of the ordered L10 phase The blocking temperature as a function of the annealing temperature was investigated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.2131.pdf
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