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    • 2. 发明专利
    • Method of nondestructively measuring deterioration of ferromagnetic structural material due to passage of time
    • JP2004184392A
    • 2004-07-02
    • JP2003110407
    • 2003-04-15
    • Iwate Univ岩手大学長
    • TAKAHASHI MASAKI
    • G01N3/00G01N3/02G01N17/00G01N27/72
    • G01N17/006G01N27/72G01N2203/0017G01N2203/0236
    • PROBLEM TO BE SOLVED: To provide a method, by which the deterioration due to aging of a ferromagnetic structural material can be evaluated accurately and systematically, by more measuring in detail the types and the amounts of lattice defects through nondestructive measurement at weak magnetic field intensity. SOLUTION: In this method, the correlation between physical quantities (for example, Hc* and 1/x H *) is obtained from a reference hysteresis minor loop, obtained by giving a load stress σ to the same type of material as that of the ferromagnetic structural material to be measured, according to the results of tensile tests performed on the material in an evaluation information acquiring step. In measuring step, the measured values of the physical quantities (for example, Hc* and 1/x H *) are found from a measured hysteresis minor loop, obtained from the structural material to be measured. In evaluating step, in addition, the deterioration due to aging of the structural material is evaluated from the correlation between the measured values and physical quantities. Each minor loop is obtained for every maximum magnetic field, from the relation between magnetic field intensities and magnetic flux densities obtained by measuring the magnetic flux, density of the structural material, by changing the maximum magnetic field impressed upon the material of the same type in steps within the range of the magnetic field intensity that is lower than that of the saturation magnetic field. COPYRIGHT: (C)2004,JPO&NCIPI
    • 4. 发明专利
    • Non-destructive measuring method of secular deterioration associated with change in brittleness of ferromagnetic structure material
    • 非破坏性测量方法与纤维结构材料的脆性相关的变化相关
    • JP2002372519A
    • 2002-12-26
    • JP2001181135
    • 2001-06-15
    • Iwate Univ岩手大学長
    • TAKAHASHI MASAKI
    • G01N27/72G01N27/80
    • G01N27/80G01N27/72
    • PROBLEM TO BE SOLVED: To provide a method for measuring the degree of secular deterioration of a ferromagnetic structure such as a pressure vessel of a nuclear reactor as the brittleness is changed in a pre-stage of cracking in a non-destructive manner by using a small magnetic yoke and an excitation power source. SOLUTION: In the non-destructive measuring method of the secular deterioration of a ferromagnetic structural material as the brittleness of a material thereof is changed, the magnetic susceptibility χb of the ferromagnetic material is measured by a predetermined magnetic field intensity H with at least the coercive force Hc, and the embrittlement coefficient b is obtained from the expression b=χb H by using the magnetic susceptibility χb and the magnetic field intensity H. The correlation Hv=f(b) between the embrittlement coefficient b and the reference embrittlement factor (Vickers hardness Hv) changing corresponding to the change in brittleness of the ferromagnetic material similar to that of the ferromagnetic structural material to be measured is obtained in advance. The Vickers hardness Hv corresponding to each embrittlement coefficient b in the initial state and after the secular deterioration of the ferromagnetic structural material to be measured is obtained from the correlation Hv=f(b), and the Vickers hardness Hv is compared to quantitatively obtain the change in brittleness due to the secular deterioration of the ferromagnetic structure to be measured.
    • 要解决的问题:提供一种用于测量核反应堆等铁磁结构的长期劣化的方法,因为脆性在破坏的前期以非破坏性方式改变,通过使用 小磁轭和励磁电源。 解决方案:随着材料的脆性改变,铁磁结构材料的长期劣化的非破坏性测量方法,铁磁材料的磁化率χb通过至少具有矫顽力的预定磁场强度H来测量 力Hc,并且通过使用磁化率χb和磁场强度H从表达式b =χbH 2获得脆化系数b。脆化系数b和参考脆化之间的相关性Hv = f(b) 预先获得与铁磁材料脆性变化相对应的因素(维氏硬度Hv)变化与被测铁磁结构材料相似的变化。 从相关性Hv = f(b)获得在初始状态下和在待测铁磁结构材料的长期劣化后的初始状态下和每个脆化系数b之间的维氏硬度Hv,并将维氏硬度Hv进行比较, 由于要测量的铁磁结构的长期劣化而导致的脆性变化。
    • 7. 发明专利
    • Nondestructive measuring method for aged deterioration of strength of austenitic stainless steel
    • JP2004245815A
    • 2004-09-02
    • JP2003176884
    • 2003-06-20
    • Iwate Univ岩手大学長
    • TAKAHASHI MASAKI
    • G01N27/72G01N33/20
    • G01N27/72G01N33/20
    • PROBLEM TO BE SOLVED: To provide a quantitative and nondestructive measuring method of a lattice defect such as dislocation a causing of aged deterioration of strength of an austenitic stainless steel. SOLUTION: In this nondestructive measuring method for the aged deterioration of the strength of the austenitic stainless steel, a relation between a load stress σ and the first ratio Ms/χ H * between a saturation magnetism Ms and a pseudo-magnetic susceptibility χ H * is acquired beforehand from a standard hysteresis/minor loop acquired by applying the load stress σ corresponding to the result of a tensile test relative to the same kind of material as a measuring object in an evaluation information acquisition process. In a measuring process, the value of the first ratio Ms/χ H * is determined as a measured value from the measured hysteresis/minor loop acquired by measuring the measuring object. In an evaluation process, the aged deterioration of the measuring object is evaluated by comparing the relation between a deformation stress σ and the first ratio Ms/χ H * with the measured value. Each minor loop is acquired by measuring a magnetic flux density by changing stepwise the maximum magnetic field H MAX in a range of less magnetic field intensity than the saturation magnetic field intensity. COPYRIGHT: (C)2004,JPO&NCIPI
    • 8. 发明专利
    • Apparatus and method for analyzing biological time-series signal
    • 用于分析生物时间序列信号的装置和方法
    • JP2004174036A
    • 2004-06-24
    • JP2002345307
    • 2002-11-28
    • Iwate Univ岩手大学長
    • ITO KIKUICHIITO TAKANORI
    • A61B5/00G06F17/15G06N7/08
    • PROBLEM TO BE SOLVED: To provide an apparatus for identifying unknown factors contained in a biological vibration phenomenon from time-series data of the vibration phenomenon, and a method.
      SOLUTION: The apparatus for analyzing biological time-series signals is characterized in that it comprises a chaos analysis means for performing a chaos analysis of the time-series data of a biological vibration phenomenon of a correlation coefficient calculating means for calculating a correlation coefficient between predicted time-series data acquired by the chaos analysis and the data of the biological vibration phenomenon, and an identifying means for identifying the number of factors relating to the biological vibration phenomenon on the basis of the correlation coefficient calculated by the correlation coefficient calculating means.
      COPYRIGHT: (C)2004,JPO
    • 要解决的问题:提供一种用于根据振动现象的时间序列数据识别生物振动现象中包含的未知因素的装置和方法。 解决方案:用于分析生物时间序列信号的装置的特征在于,其包括用于对相关系数计算装置的生物振动现象的时间序列数据进行混沌分析的混沌分析装置,用于计算相关性 通过混沌分析获得的预测时间序列数据与生物振动现象的数据之间的系数;以及识别装置,用于根据通过相关系数计算计算的相关系数来识别与生物振动现象有关的因素的数量 手段。 版权所有(C)2004,JPO