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1.
Room temperature transmission Mössbauer spectra of Fe62Ni16B14Si8 ribbons, annealed in vacuum for time periods ranging from 5 to 60 minutes at the crystallization temperatureT
x=720 K, have been used to investigate the crystallization mechanism by isothermal annealing. Reorientation of the magnetic anisotropy almost normal to the ribbon plane was observed and correlated to the annealing time dependence of the mean hyperfine field (HF) of the amorphous component. Crystallization started at the surface before the bulk and was found to occur in two steps: a metastable equilibrium of the amorphous phase with (FeNi), (FeNi)Si and t-(FeNi)3B, followed by the decomposition of t-(FeNi)3B into t-(FeNi)2B and (FeNi). The increase of the mean magnetic moment at the Fe sites as compared to related iron-based alloys was attributed to compositional small Ni additions. 相似文献
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S.?Didaoui-NemouchiEmail author A.?Ait-Kaci M.?Rogalski 《Journal of Thermal Analysis and Calorimetry》2005,79(1):85-88
Enthalpies of mixing H have been measured for liquid binary mixtures of diisopropylether (DIPE)+benzene or cyclohexane and for liquid ternary mixtures diisopropylether+benzene+cyclohexane at 303.15 K and constant pressure using a C80 calorimeter. A Redlich-Kister type equation was used to correlate experimental results. 相似文献
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J. Rutkowski P. Madejczyk A. Piotrowski W. Gawron K. Jóźwikowski A. Rogalski 《Opto-Electronics Review》2008,16(3):321-327
The performance of dual waveband HgCdTe photodiodes fabricated using metaloorganic chemical vapour deposition operated at
high temperatures is presented. The effect of additional separating layer on the quantum efficiency and cross-talk of the
photodiodes is analyzed. The photodiodes with cutoff wavelengths up to 6 μm, good R0A product, and high quantum efficiency at 200 K have been demonstrated. The temperature dependence of the differential resistance
is discussed. It is shown that the multilayer heterojunction P-n-N-n-P structure operating in a simultaneous mode has better
performance than a structure operating in a sequential mode. 相似文献
7.
<正>Two new eudesmane derivatives were isolated from the leaves and flowers of Verbesina virginica,along with the known 6-O-β-E -p-coumaroyl-4α-hydroxyeudesmane(1).Their structures were determined as 6-O-β-Z-p-coumaroyl-4α-hydroxyeudesmane(2) and 6-O-α-E-p-coumaroyl-1β-4α-dihydroxyeudesmane(3) by spectroscopic methods. 相似文献
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Saéda Didaoui Ahmed Ait-Kaci Mareck Rogalski 《The Journal of chemical thermodynamics》2010,42(10):1261-1264
(Solid + liquid) equilibrium (SLE) of thiophene or diethylsulfide with n-heptane, n-octane or n-dodecane mixtures was measured by a static method. All the systems under study are simple eutectic systems. The DISQUAC group contribution model is fairly successful in predicting SLE. 相似文献
9.
E. Nazaruk K. Sadowska J. F. Biernat J. Rogalski G. Ginalska R. Bilewicz 《Analytical and bioanalytical chemistry》2010,398(4):1651-1660
Nanostructured bioelectrodes were designed and assembled into a biofuel cell with no separating membrane. The glassy carbon
electrodes were modified with mediator-functionalized carbon nanotubes. Ferrocene (Fc) and 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonate)
diammonium salt (ABTS) bound chemically to the carbon nanotubes were found useful as mediators of the enzyme catalyzed electrode
processes. Glucose oxidase from Aspergillus niger AM-11 and laccase from Cerrena unicolor C-139 were incorporated in a liquid-crystalline matrix-monoolein cubic phase. The carbon nanotubes–nanostructured electrode
surface was covered with the cubic phase film containing the enzyme and acted as the catalytic surface for the oxidation of
glucose and reduction of oxygen. Thanks to the mediating role of derivatized nanotubes the catalysis was almost ten times
more efficient than on the GCE electrodes: catalytic current of glucose oxidation was 1 mA cm−2 and oxygen reduction current exceeded 0.6 mA cm−2. The open circuit voltage of the biofuel cell was 0.43 V. Application of carbon nanotubes increased the maximum power output
of the constructed biofuel cell to 100 μW cm−2 without stirring of the solution which was ca. 100 times more efficient than using the same bioelectrodes without nanotubes
on the electrode surface. 相似文献
10.
Terahertz detectors and focal plane arrays 总被引:1,自引:0,他引:1
Terahertz (THz) technology is one of emerging technologies that will change our life. A lot of attractive applications in
security, medicine, biology, astronomy, and non-destructive materials testing have been demonstrated already. However, the
realization of THz emitters and receivers is a challenge because the frequencies are too high for conventional electronics
and the photon energies are too small for classical optics. As a result, THz radiation is resistant to the techniques commonly
employed in these well established neighbouring bands. 相似文献