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    • 2. 发明授权
    • Protective relaying system
    • 保护继电系统
    • US3984737A
    • 1976-10-05
    • US530286
    • 1974-12-06
    • Masami OkamuraYoshihumi OuraYoshihiro SanoJunichi MakinoYoshiteru Miki
    • Masami OkamuraYoshihumi OuraYoshihiro SanoJunichi MakinoYoshiteru Miki
    • H02H3/00H02H1/00H02H3/26H02H3/38H02H3/42H02H3/46
    • H02H1/0053H02H3/26H02H3/382H02H3/42H02H3/46
    • Protection of an electric power system is attained under control of a digital computer. Voltage and current of the electric power system to be protected are subjected to sampling at a predetermined sampling frequency and are applied to the computer after being converted into digital signals. The computer computes the product of these two digital signal inputs. The signal thus obtained is added to a preceding signal representing the product of voltage and current taken at time before a predetermined period of time so that unnecessary frequency components included in these signals can be removed. Then, the level of the resultant signal (which is free from the unnecessary frequency components) is compared with the level of a reference signal. When the former is greater than the latter, there is a fault in the electric power system, and necessary protective measures are taken to protect the electric power system.
    • 在数字计算机的控制下实现电力系统的保护。 要保护的电力系统的电压和电流以预定的采样频率进行采样,并且在被转换成数字信号之后被施加到计算机。 计算机计算这两个数字信号输入的乘积。 由此获得的信号被加到表示在预定时间段之前的时间所获得的电压和电流的乘积的先前信号,从而可以去除包括在这些信号中的不必要的频率分量。 然后,将结果信号(没有不必要的频率分量)的电平与参考信号的电平进行比较。 当前者大于后者时,电力系统存在故障,采取必要的保护措施保护电力系统。
    • 7. 发明授权
    • Cold-accumulating material and cold-accumulating refrigerator using the same
    • 蓄冷材料和使用其的冷堆冰箱
    • US06334909B1
    • 2002-01-01
    • US09331157
    • 1999-06-17
    • Masami OkamuraTomohisa AraiKeisuke Hashimoto
    • Masami OkamuraTomohisa AraiKeisuke Hashimoto
    • H01F1053
    • F25B9/14C09K5/14F25B2309/003H01F1/0009H01F1/015
    • A cold accumulating material comprising magnetic substance expressed by the general formula: RCu1−xM1+x  (1) wherein R denotes at least one of rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Er, Ho, Tm and Yb, M denotes at least one element selected from the group consisting of Ag, Au, Al, Ga, In, Ge, Sn, Sb, Si, Bi, Ni, Pd, Pt, Zn, Co, Rh, Ir, Mn, Fe, Ru, Cr, Mo, W, V, Nb, Ta, Ti, Zr and Hf, and wherein Ni and Ge are not simultaneously selected, and x in atomic ratio satisfies a relation: −0.95≧x≧0.90. According to the above structure, there can be provided a cold accumulating material and a refrigerator using the cold accumulating material capable of exhibiting a remarkable and stable refrigerating performance at an extremely low temperature for a long time.
    • 一种由以下通式表示的磁性物质的蓄冷材料:其中R表示选自Y,La,Ce,Pr,Nd,Pm,Sm,Eu,Gd,Tb,Dy中的至少一种稀土元素 ,Er,Ho,Tm和Yb,M表示选自Ag,Au,Al,Ga,In,Ge,Sn,Sb,Si,Bi,Ni,Pd,Pt,Zn,Co中的至少一种元素 ,Rh,Ir,Mn,Fe,Ru,Cr,Mo,W,V,Nb,Ta,Ti,Zr和Hf,并且其中不同时选择Ni和Ge,原子比为x满足关系:-0.95 > = x> = 0.90。 根据上述结构,可以提供一种使用能够在极低温度下长期显现出显着且稳定的制冷性能的蓄冷材料的蓄冷材料和冷藏库。
    • 8. 发明授权
    • Regenerator material for extremely low temperatures and regenerator for
extremely low temperatures using the same
    • 用于极低温度的再生器材料和使用其的极低温度的再生器
    • US6042657A
    • 2000-03-28
    • US793261
    • 1997-02-21
    • Masami OkamuraNaoyuki Sori
    • Masami OkamuraNaoyuki Sori
    • F25B9/14H01F1/055
    • F25B9/14F25B2309/003
    • A cold heat accumulating material for extremely low temperatures which comprises cold heat accumulating granular bodies in which a rate of particles, which are destroyed when a compressive force of 5 MPa is applied thereto by a mechanical strength evaluation die, out of the magnetic cold heat accumulating particles constituting the magnetic cold heat accumulating granular bodies is not than 1 wt. %. In this magnetic cold heat accumulating granular bodies, a rate of magnetic cold heat accumulating particles having more than 1.5 form factor R expressed by L2/4.pi.A, wherein L represents a circumferential length of a projected image of each magnetic cold heat accumulating particle, and A a real of the projected image, is not more than 5%. Such a cold heat accumulating material for extremely low temperatures is capable of providing excellent mechanical properties with respect to mechanical vibration with a high reproducibility. A cold heat accumulator for extremely low temperatures is formed by filling a cold heat accumulating container with a cold heat accumulating material for extremely low temperatures comprising the above-mentioned magnetic cold heat accumulating granular bodies. Such a cold heat accumulator for extremely low temperatures can display excellent performance for a long period of time.
    • PCT No.PCT / JP95 / 01653 Sec。 371日期1997年2月21日 102(e)日期1997年2月21日PCT提交1995年8月22日PCT公布。 出版物WO96 / 06315 日本特开1996年2月29日是用于极低温度的冷热蓄热材料,其特征在于,具有冷堆积粒状体,其中,当通过机械强度评价模具施加压力为5MPa时被破坏的颗粒的速度从 构成磁性冷蓄热颗粒体的磁性冷累积粒子不大于1重量%。 %。 在这种磁性冷积热颗粒体中,具有由L + E,fra 2/4 + EE pi A表示的具有大于1.5形状因子R的磁性冷累积颗粒的速率,其中L表示投影图像的周长 每个磁性冷积聚粒子,A是投影图像的实数,不大于5%。 这种用于极低温度的冷累积材料能够以高再现性提供相对于机械振动的优异的机械性能。 通过用包含上述磁性冷蓄热颗粒体的极低温度的冷蓄热材料填充冷蓄热容器来形成极低温度的冷热蓄热器。 这种用于极低温度的冷热蓄热器可以长时间显示出优异的性能。