電気製鋼
Online ISSN : 1883-4558
Print ISSN : 0011-8389
ISSN-L : 0011-8389
72 巻, 4 号
一般号
選択された号の論文の9件中1~9を表示しています
論説
  • 原稿種別: 総説
    専門分野: その他
    2001 年 72 巻 4 号 p. 215-222
    発行日: 2001年
    公開日: 2001/11/29
    ジャーナル フリー
    The Relative sensitivity factors (RSFs) of many elements in Fe, Ni, Cu, Al and Ti-based metals or alloys were determined with reference to the respective matrices using pin-shaped and disk-shaped samples. The RSFs of the elements that were obtained for both the Fe-matrix and another matrix were compared. There was a strong correlation between the RSFs for the Fe-matrix and each of the other matrices and the proportional coefficients were determined for the Ni,Cu,Al and Ti matrices using the method of least squares. Then, all the RSFs for these matrices were multiplied by the respective proportional coefficients. These RSFs can be regarded to have been determined with reference to Fe. Matrix dependence of the RSFs was not recognized. However, the RSF of Al matrix is larger than the RSF in the case of element in the relevant matrices. The RSFs of Al in the respective matrices have been determined at different concentrations. The RSFs of Al depend on the concentration. These are larger for larger concentrations. On the other hand, the RSFs of Fe, Ni, Cu and Ti do not show such a clear dependence on the concentration as Al. The results show that there is a possibility that a non-linear process affect the ionization of elements in glow discharge mass spectrometry.
  • 原稿種別: 総説
    専門分野: 電子材料
    2001 年 72 巻 4 号 p. 223-229
    発行日: 2001年
    公開日: 2001/11/29
    ジャーナル フリー
    As the operating frequency becomes much higher, the electromagnetic interference turns to the critical issue in the metal cases of electronic devices. The electromagnetic wave absorber has been mounted on the cases in order to suppress the interference. Authors measured the attenuation of the electromagnetic wave in the waveguides simulating the metal case, lined with the synthetic rubber absorber, 0.5 to 3mm in thickness, bearing Fe-7Cr-9Al soft-magnetic powder, 15 micrometer in diameter and 8 to 40% in volume. The reflection losses of the rubber absorbers were also measured and compared with the attenuation. In 10GHz, the both losses reach maximum at the 25vol% and 1.5 /1.7mm thick sheet. However, the attenuation and reflection losses show different characteristics in 22GHz and 28GHz. In 22GHz, although the reflection loss reach maximum at the 12 vol.% and 1.1mm thick sheet, the maximum attenuation is at the 20 vol.% and 1.1mm thick sheet. In 28GHz, although the reflection loss reach maximum at the 23 vol.% and 0.7mm thick sheet, but the maximum attenuation is at the 35 vol.% and 0.7mm thick sheet. The results imply the design of the absorber should be based on the fine and delicate analysis of the suppression of the interference in the metal cases.
  • 原稿種別: 総説
    専門分野: 電子材料
    2001 年 72 巻 4 号 p. 231-238
    発行日: 2001年
    公開日: 2001/11/29
    ジャーナル フリー
    The concentrator solar cell system significantly reduces the number or area of expensive cells and then contributes to the curtailment of the total investment. It is acknowledged in US and European countries that the well-designed concentrator PV (PhotoVoltaics) cost reaches down to the 6 - 8 cents/kWh range. In this research, the yearly photon number was calculated for a tracking concentrator PV in 26 principle sunshine sites in Japan on a new model. This model was also applied to the quantitative analysis of the spectrum mismatching loss inherent in III-V multi-junction solar cells. Authors expect that the generation cost will be 20 yen/kWh even in Japan if the PV costs modestly.
  • 原稿種別: 総説
    専門分野: 新素材
    2001 年 72 巻 4 号 p. 239-245
    発行日: 2001年
    公開日: 2001/11/29
    ジャーナル フリー
    As Ag-Pd dispersoids in the conductive paste the prealloyed powder is superior to the mixed elemental, which is prone to the migration with Ag dissolution and to the expansion due to Pd oxidation. Among the prealloyed powders the highly dispersed one developed by authors has the following features which the conventional agglomerated ones lack. The paste bearing the highly dispersed prealloyed powders possesses higher thixotropy and fluidity sufficient to form the thick and flat electrode more conductive and solder leach resistant. Because of its higher conductivity and adhesion, the Pd content will be able to be reduced to 10% or less if the paste is co-fired at 950°C for 1hr on the glass-ceramic substrate. The Bi2O3 is only one metallic oxide additive to secure the thickness and adhesion of the Ag-Pd electrode.
解説
技術資料
  • 原稿種別: 研究論文
    専門分野: 新素材
    2001 年 72 巻 4 号 p. 261-264
    発行日: 2001年
    公開日: 2001/11/29
    ジャーナル フリー
    HIKARI GIN-Tech is a photocatalyst of anatase TiO2 powders, 7nm in diameter, covered with satellites of extremely fine particles of silver. The synergistic reaction of TiO2 and Ag gives it an unrivaled powerful antibacterial function effective against a wide variety of pathogenic and resistant bacteria spreading in clinics. The laboratory test proved it is also effectual against tuberculosis bacteria. The spray with HIKARI GIN-Tech suspending in alcohol demonstrated the same function as powders themselves. The HIKARI GIN-Tech application products are under field tests in clinics with promising results.
  • 原稿種別: 研究論文
    専門分野: その他
    2001 年 72 巻 4 号 p. 265-269
    発行日: 2001年
    公開日: 2001/11/29
    ジャーナル フリー
    The extremely tight control of constituent elements is essential to the advanced shape memory alloys. In order to judge the molten metal acceptable or unacceptable, the standard deviation in Ni analysis should be 0.005wt% or less. The handy and prompt X-ray fluorescence spectroscopy is tailored to secure such accuracy through following procedures. 1) Sampling into an iron case to obtain the fully columnar cast structure through the cross section 2) Masking samples with the identical mask for every measurement 3) Calculation of Ni from the intensity ratio Ni/Ti, where Ti is treated as an internal standard 4) Calibration with at least 7 Ni-Ti alloys prepared in-house.
  • 原稿種別: 研究論文
    専門分野: その他
    2001 年 72 巻 4 号 p. 271-276
    発行日: 2001年
    公開日: 2001/11/29
    ジャーナル フリー
    In Japan the municipal solid waste (MSW) incinerator dust has been assigned to one of the strictly regulated categories which should be treated in accordance with the law. In order to reduce its volume and decompose hazardous dioxin, "melting" the dust is the most practical method among the authorized ones. Daido Steel had installed the DAP system where the arc is the heat source to melt the dust as the mixture with the ash from the MSW incinerator, because the dust itself possesses the chemical composition and physical properties not fit for its arc melting. The new system with an oxygen burner was designed to melt down the dust only at extremely high temperatures. The pilot plant in-house with the capacity of 1.2ton/day passed successfully the 100 day endurance test imposed by the authorities.
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