共查询到20条相似文献,搜索用时 46 毫秒
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Based on the flux creep equation, the effect of critical current density and critical temperature on ac susceptibility is
investigated numerically in a superconducting slab immersed in an ac magnetic field. The current density dependence of the
flux creep activation barrier is employed as the logarithmic law. The fundamental ac susceptibilities of the slab as a function
of temperature for the same ac field have been derived in a unified picture. The results show that ac susceptibility in flux
creep regime is affected by critical current density and critical temperature. 相似文献
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A. Aliane F. De Moro C. Pigot P. Agnese X. de la Broïse A. Gasse X.-F. Navick M. Karolak H. Ribot J.-L. Sauvageot V. Szeflinski Y. Gobil D. Renaud P. Rivallin H. Geoffray 《Journal of Low Temperature Physics》2008,151(1-2):381-386
X-ray Astronomy provides a unique window on a wide variety of astrophysical phenomena. The currently operating X-ray space
observatories perform X-ray spectral imaging with the use of CCDs. When available, cryogenic X-ray microcalorimeter arrays
will far outperform CCDs in terms of spectral resolution, energy bandwidth and count rate. Experience has been gained with
Infra-Red bolometer arrays at CEA-LETI (Grenoble) in collaboration with the CEA-SAp (Saclay); taking advantage of this background,
we are now developing an X-ray spectro-imaging camera for the next generation space astronomy missions, using silicon technology
(implanted and high temperature diffused thermistors).
Each pixel of this array detector is made of a tantalum absorber bound, by indium bump hybridization, to a silicon thermistor.
The absorber array is bound to the thermistor array in a single automatic step. The thermo-mechanical link, provided by hybridization,
is being improved in terms of thermal capacitance. Finally, our main effort is in developing arrays of silicon thermistors
with negligible excess 1/f noise. The thermistor has been simulated with the 2D simulator ATHENA (SILVACO International). We studied the effects of
the implants and their thermal treatment on both vertical and lateral dopant distributions at the edges of the thermistor.
Prototypes have been created following the procedure optimized by the ATHENA simulation. We present the status of the development
and results of measurements performed on these four main building blocks required to create a detector array up to 32×32 pixels
in size.
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M. Sugiura A. Shinotake M. Nakashima N. Omoto 《International Journal of Thermophysics》2014,35(6-7):1320-1329
As the initial process in an integrated steel-making plant, molten iron is produced in a blast furnace. The molten iron has a temperature between 1700 K and 1900 K. The outflow stream discharged from a taphole comprises the molten iron and slag (which is a mixture of molten oxides). Monitoring of the stream temperature is important because it has information on the thermal condition inside the blast furnace. A newly developed simultaneous measurement technique for temperature and iron–slag ratio is reported. A monochromatic CCD camera with a short exposure time is used to obtain a thermal image of the rapidly moving stream. The thermal image has a marble-like pattern caused by the physical separation of the iron and slag and their different optical properties. Iron thermometry is realized by automatically detecting the peak of the iron gray-level distribution on a histogram. Meanwhile, the thermal radiance of the semitransparent slag varies as a function of the thickness. The slag temperature is calculated from the maximum gray level, presuming that the emissivity of the slag is constant at a thick slag part. The slag ratio is measured by counting the number of pixels on the histogram. A field test was carried out at an operating blast furnace. The iron temperature, slag temperature, and slag ratio were successfully measured. This multiple image measurement is expected to be the new information source for stable blast furnace operation. 相似文献
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Toshiaki Kobayashi Ayanori Saito Junko Taniguchi Masaru Suzuki Keiya Shirahama 《Journal of Low Temperature Physics》2010,158(1-2):250-255
Recently, torsional oscillator (Yamamoto et al. in Phys. Rev. Lett. 93:075302, 2004) and ultrasound (Kobayashi et al. in AIP Conf. Proc. 128:797, 2007) measurements were carried out for pressurized 4He filled in a nanoporous glass (Gelsil), and the superfluid transition temperature T C shows a different pressure dependence. Thus motivated, we have performed simultaneous measurements with a torsional oscillator and with ultrasound for pressurized 4He in Gelsil. T C is in agreement between the two techniques at all pressures, and the superfluid component above 0.5 K shows most of the same temperature dependence. Furthermore, it was found that the χ-factor (the fraction of superfluid which remains locked to the substrate ) is independent of measuring frequency between the torsional oscillator (kHz-order) and the ultrasound (MHz-order) ranges. 相似文献
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W. T. Wang M. H. Pu W. Wang H. Zhang C. H. Cheng Y. Zhao 《Journal of Superconductivity and Novel Magnetism》2010,23(6):989-993
High performance YBCO epitaxial films were prepared on LaAlO3 (00l) single crystal substrate by the non-fluorine polymer-assisted metal organic deposition (PA-MOD) method. Influence of partial melting temperature on the epitaxial structure and superconducting properties of YBCO films was investigated. Biaxial texture, surface morphology, and superconducting properties of the films have been significantly improved under the optimized preparation conditions. A high J c up to 3.5 MA/cm2 at 77 K, self-field has been achieved with a significantly improved J c(H). 相似文献