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    • 23. 发明授权
    • Center collapsible transport cart
    • 中心可折叠运输车
    • US4878682A
    • 1989-11-07
    • US222958
    • 1988-07-22
    • David M. Lee
    • David M. Lee
    • B62B3/00B62B3/02B62B11/00
    • B62B3/025B62B3/007B62B5/067
    • A center collapsible transport cart having at least two floor panels pivotally connected along a longitudinal pivot axis. Side panels and end members may be attached to the outer edges of the floor panel to form a desired cargo bed enclosure. When the cart is in its "operative" configuration the floor panels are horizontally disposed in approximate edge-to-edge juxtaposition. When converted to its "stowed" configuration the floor panels are generally vertically disposed in surface-to-surface juxtaposition, thereby forming a relatively flat collapsed structure. A tow bar handle is also pivotally disposable between the vertically juxtapositioned floor panels when the cart is in its stowed configuration.
    • 具有至少两个地板面板的中心可折叠运输车辆沿着纵向枢转轴线枢转地连接。 侧板和端部构件可以附接到地板镶板的外边缘以形成所需的货物舱围。 当推车处于“操作”配置时,地板镶板以大致的边缘到边缘的并列水平设置。 当转换成“收起”的构造时,地板镶板通常垂直地以表面到表面并置设置,从而形成相对扁平的折叠结构。 当推车处于其收起的构型时,牵引杆手柄也可摆放在垂直并置的地板镶板之间。
    • 26. 发明授权
    • Method and apparatus for measuring reactivity of fissile material
    • 用于测量裂变材料的反应性的方法和装置
    • US4493810A
    • 1985-01-15
    • US415616
    • 1982-09-07
    • David M. LeeLloyd O. Lindquist
    • David M. LeeLloyd O. Lindquist
    • G21C17/104G21C17/00
    • G21C17/104
    • Given are a method and apparatus for measuring nondestructively and non-invasively (i.e., using no internal probing) the burnup, reactivity, or fissile content of any material which emits neutrons and which has fissionable components. No external neutron-emitting interrogation source or fissile material is used and no scanning is required, although if a profile is desired scanning can be used. As in active assays, here both reactivity and content of fissionable material can be measured. The assay is accomplished by altering the return flux of neutrons into the fuel assembly. The return flux is altered by changing the reflecting material. The existing passive neutron emissions in the material being assayed are used as the source of interrogating neutrons. Two measurements of either emitted neutron or emitted gamma-ray count rates are made and are then correlated to either reactivity, burnup, or fissionable content of the material being assayed, thus providing a measurement of either reactivity, burnup, or fissionable content of the material being assayed. Spent fuel which has been freshly discharged from a reactor can be assayed using this method and apparatus. Precisions of 1000 MWd/tU appear to be feasible.
    • 给出的是用于非发射和非侵入地(即,不使用内部探测)测量发射中子并且具有可裂变组分的任何材料的燃耗,反应性或易裂变含量的方法和装置。 没有使用外部发射中子的询问源或裂变材料,并且不需要扫描,尽管如果需要扫描,可以使用扫描。 如在活性测定中,可以测量可裂变材料的反应活性和含量。 该测定通过改变中子进入燃料组件的回流通量来实现。 通过改变反射材料来改变回流通量。 被测材料中现有的被动中子发射被用作询问中子的来源。 对发射的中子或发射的伽马射线计数率进行两次测量,然后将其与被测材料的反应性,燃耗或可裂变含量相关联,从而提供材料的反应性,燃耗或可裂变含量的测量 被测定。 已经从反应器中新鲜排出的废燃料可以使用该方法和装置进行测定。 1000 MWd / tU的精度似乎是可行的。