Thin-film magnetic head
    32.
    发明授权
    Thin-film magnetic head 失效
    薄膜磁头

    公开(公告)号:US4942489A

    公开(公告)日:1990-07-17

    申请号:US140786

    申请日:1988-01-05

    CPC classification number: G11B5/3116 G11B5/31 G11B5/3143

    Abstract: A thin-film magnetic head which can simultaneously trace two tracks is disclosed. This head comprises: a pair of magnetic gap portions; and a pair of magnetic thin-film layers each of which includes a magnetic pole portion in contact with the magnetic gap portion. A distance between these layers increases as they go away from the magnetic pole portions. Each of the layers includes an expanded portion having a cross sectional area in the passing direction of the magnetic fluxes which is larger than a cross sectional area in the passing direction of the magnetic fluxes at the magnetic pole portion.

    Abstract translation: 公开了一种可以同时跟踪两个轨道的薄膜磁头。 该头包括:一对磁隙部分; 以及一对磁性薄膜层,每个磁性薄膜层包括与磁隙部分接触的磁极部分。 这些层之间的距离随着离开磁极部分而增加。 每个层包括具有大于磁极部分的磁通量的通过方向上的横截面积的磁通量的通过方向上的横截面积的扩展部分。

    Two-stage hydrogenation of benzene to form cyclohexane using nickel
catalyst
    33.
    发明授权
    Two-stage hydrogenation of benzene to form cyclohexane using nickel catalyst 失效
    使用镍催化剂对苯进行二阶段氢化形成环己烷

    公开(公告)号:US4108912A

    公开(公告)日:1978-08-22

    申请号:US797964

    申请日:1977-05-18

    Abstract: In a process for carrying out a reaction in a plurality of catalyst zones arranged in series which shows remarkable rise of reaction temperature due to its high initial activity, an improvement is provided by starting the reaction with a first reactor in which its catalyst activity is reduced in advance so as to make it easier to control the reaction temperature; with other reactors in which their catalyst activities are maintained at higher values with an increasing gradient and with a last reactor in which its catalyst activity is made sufficiently larger in order to be able to maintain the initial value of total conversion with all the reactors even at a time when the catalyst activity of the first reactor is reduced to unusable extent, interrupting the reaction when the catalyst activity of the first reactor is reduced to unusable extent, transferring the first reactor to the next to the last reactor after charged with a new catalyst, and repeating the operation in the subsequent run as in the first run except that the order of each of the reactors is advanced by one in each time of the transfer of the first reactor to the last.

    Abstract translation: 在串联排列的多个催化剂区域进行反应的过程中,由于其初始活性高,反应温度显着升高,通过与其催化剂活性降低的第一反应器开始反应来提供改进 以便更容易控制反应温度; 与其他反应器一起,其催化剂活性以更高梯度保持在较高值,并且使用最后一个反应器,其中其催化剂活性足够大,以便能够保持所有反应器的总转化率的初始值,即使在 当第一反应器的催化剂活性降低到不可用程度的时候,当第一反应器的催化剂活性降低到不可用程度时中断反应,在加入新催化剂之后将第一反应器转移到最后的反应器 ,并且在第一次运行中重复后续运行中的操作,除了每个反应器的顺序在第一反应器转移到最后的每个时间中前进一个。

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