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    • 16. 发明授权
    • Bending of thermoplastic tubes
    • 弯曲热塑性管
    • US06346211B1
    • 2002-02-12
    • US09397223
    • 1999-09-16
    • John RaffertyRobert Davidson
    • John RaffertyRobert Davidson
    • B21D900
    • B29C53/083
    • A method and apparatus for bending thermoplastic tube in which a pre-heated region of the tube is conformed to a required bend configuration while supported internally and externally to prevent the tube wall collapsing. The external support is provided by relatively movable formers which enclose a section of the tube at the point where the bending force is applied and this enclosed section moves progressively along the heated region as the bend is developed by the relative movement of the formers. The internal support is provided by fluid pressure higher than atmospheric pressure within the tube during the forming operation. Multiple bends can be formed sequentially and/or siitultateously.
    • 一种用于弯曲热塑管的方法和装置,其中管的预热区域符合所需的弯曲构造,同时在内部和外部支撑以防止管壁崩溃。 外部支撑由相对移动的成形器提供,该构件在施加弯曲力的点处包围管的一部分,并且当通过成形器的相对运动而形成弯曲时,该封闭部分沿加热区域逐渐移动。 在成形操作期间,内部支撑由在管内高于大气压的流体压力提供。 多个弯曲可以顺序地和/或顺序地形成。
    • 17. 发明授权
    • Data structure partitioning to optimize cache utilization
    • 数据结构分区优化缓存利用率
    • US06330556B1
    • 2001-12-11
    • US09270125
    • 1999-03-15
    • Trishul M. ChilimbiJames R. LarusRobert Davidson
    • Trishul M. ChilimbiJames R. LarusRobert Davidson
    • G06F1730
    • G06F17/30339G06F12/0802Y10S707/99932
    • Fields which are individually addressable data elements in data structures are reordered to improve the efficiency of cache line access. Temporal data regarding the referencing of such fields is obtained, and a tool is used to construct a field affinity graph of temporal access affinities between the fields. Nodes in the graph represent fields, and edges between the nodes are weighted to indicate field affinity. A first pass greedy algorithm attempts to combine high affinity fields in the same cache line or block. Constraints are used to reject invalid combinations of fields. Data structures such as class are partitioned into heavily referenced and less heavily referenced portions. The partitioning is based on profile information about field access counts with indirect addressing used to reference the less heavily referenced partitioned class. A class co-location scheme is used to ensure that temporally correlated classes are placed near each other in cache blocks. A generational garbage collection algorithm is used to ensure that objects that are most heavily referenced are more likely to remain in cache blocks.
    • 数据结构中可单独寻址的数据元素的字段被重新排序以提高高速缓存行访问的效率。 获得关于这些字段的引用的时间数据,并且使用工具来构建字段之间的时间访问亲和度的字段关联图。 图中的节点表示字段,并且节点之间的边被加权以指示字段亲和度。 第一遍贪婪算法尝试将高亲和度字段组合在相同的高速缓存行或块中。 限制用于拒绝字段的无效组合。 诸如类的数据结构被划分为严格引用和较少引用的部分。 分区基于关于使用间接寻址的字段访问计数的配置文件信息,用于引用较不引用的分区类。 类别同位置方案用于确保时间相关的类在缓存块中彼此靠近放置。 代数垃圾收集算法用于确保被最多引用的对象更有可能保留在高速缓存块中。
    • 18. 发明授权
    • Flexible and foldable marine ladder
    • 灵活和可折叠的海洋梯子
    • US5848667A
    • 1998-12-15
    • US799703
    • 1997-02-11
    • Robert Davidson
    • Robert Davidson
    • B63B27/14E06C5/26B63B17/00
    • E06C5/26B63B27/14
    • A folding ladder includes a vertical supporting strap formed from fabric material. The supporting strap has top and bottom ends. The top end of the strap has means, e.g., a fastener, rope or opening, for securing it to a fixed object for holding the ladder upright. At least one loop formed from strap material is provided below the top of the strap and is held in place by the supporting strap. The strap loop depends from the supporting strap and has two upper portions that are connected to each other at the top of the loop. The connected upper portions of the loop lie in lapped face-to-face relationship. Each such loop includes a downwardly depending, generally U-shaped intermediate bend between the connected portions. The U-shaped bend defines a step or hand grip with an opening above it to facilitate the entry of a hand or foot. In a preferred form of the invention, the strap material of each loop is provided with one or more half-twists.
    • 折叠梯包括由织物材料形成的垂直支撑带。 支撑带有顶端和底端。 带的顶端具有例如紧固件,绳索或开口的装置,用于将其固定到用于将梯子竖立的固定物体。 由带材形成的至少一个环设置在带的顶部下方,并通过支撑带保持在适当的位置。 带环由支撑带取向,并且在环的顶部具有彼此连接的两个上部。 连接的上部的环路处于重叠的面对面关系。 每个这样的环包括在连接部分之间的向下悬垂的大体上为U形的中间弯曲部。 U形弯曲部分定义了一个台阶或手柄,其上面有一个开口,以方便手或脚的进入。 在本发明的优选形式中,每个环的带材料被提供有一个或多个半捻。