278 research outputs found
Photon radiation calorimetry for anomalous heat generation in NiCu multilayer thin film during hydrogen gas desorption
In order to investigate the anomalous heat effect (AHE) in NiCu multilayer
thin film, photon radiation calorimetry has been developed. Three types of
photon detectors are employed to cover a wide range of wavelengths from 0.3 nm
to 5.5 um, i.e., photon energies from 0.2 to 1.8 eV. In the present work, the
usefullness of the calorimetry is demonstrated for excess heat measurements
with samples of Ni pure, NiCu composite layers, and Cu layer deposited on the
Ni substrate. Direct comparisons of photon radiation spectra with and without
H2 easily showed sample-specific differences in excess heat power. The samples
of NiCu composite layer produced larger excess heat. By incorporating the
measured radiant power into a heat flow model, the excess heat was deduced to
be 4 - 6 W. The energy generated in 80 hours reached to 520 +/- 120 kJ: the
generated energy per hydrogen was at least 460 +/- 108 keV/H atom. This is
definitely not a chemical reaction, but producing energy at the level of
nuclear reactions.Comment: 6 pages, 6 figure
Evolution of the streamwise vortices in a coaxial jet controlled with micro flap-actuators
A coaxial jet was actively controlled by a MEMS-fabricated micro flap actuator nozzle. The effect of different control modes on secondary azimuthal instabilities and the evolution of streamwise vortices were investigated by applying stereoscopic PIV to the cross-stream plane of the jet. Forcing with non-symmetric modes, in particular the least-stable helical mode, accelerates the evolution of the streamwise vortices through the enhancement of azimuthal instabilities. Although forcing is applied to the outer shear layer of the outer jet, the control effect is most pronounced in the inner shear layer of the inner jet. Unlike in the natural jet, streamwise vortices appear in the inner shear layer of the controlled jet. For forcing with the fundamental axisymmetric mode, a Strouhal number of the order of unity maximise the azimuthal instabilities and hence the counts of the streamwise vortices. The present result is in accordance with our previous experimental findings in the longitudinal plane, where the evolution of the primary vortices and mixing between the inner and the outer jets were examined through 2D-PIV and PLI
Determination of the Gamow-Teller Quenching Factor from Charge Exchange Reactions on 90Zr
Double differential cross sections between 0-12 degrees were measured for the
90Zr(n,p) reaction at 293 MeV over a wide excitation energy range of 0-70 MeV.
A multipole decomposition technique was applied to the present data as well as
the previously obtained 90Zr(p,n) data to extract the Gamow-Teller (GT)
component from the continuum. The GT quenching factor Q was derived by using
the obtained total GT strengths. The result is Q=0.88+/-0.06 not including an
overall normalization uncertainty in the GT unit cross section of 16%.Comment: 11 papes, 4 figures, submitted to Physics Letters B (accepted),
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High-Energy γ-rays Induced by Charged-Particle Bombardment
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