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209 条记录 (耗时 0.03 秒)

    Heat resistant polymers of oxidized styrylphosphine
    41.
    发明授权
    Heat resistant polymers of oxidized styrylphosphine 失效
    氧化苯乙烯基膦的耐热聚合物

    公开(公告)号：US4200721A

    公开(公告)日：1980-04-29

    申请号：US907479

    申请日：1978-05-19

    申请人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  Kazimiera J. L. Paciorek

    发明人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  Kazimiera J. L. Paciorek

    IPC分类号： C07D251/18 ,  C07D251/20 ,  C07D251/22 ,  C07F9/535 ,  C08F8/06 ,  C08F30/02 ,  C08F26/00 ,  C08C19/22 ,  C08F230/02

    CPC分类号： C08F30/02 ,  C07D251/18 ,  C07D251/20 ,  C07D251/22 ,  C07F9/5355 ,  Y10S260/24

    摘要： Homopolymers, copolymers and terpolymers of a styrene based monomer are prepared by:(1) polymerizing at least one oxidized styrylphosphine monomer selected from the group of:(C.sub.6 H.sub.5).sub.2 P(O)N.dbd.P(C.sub.6 H.sub.5).sub.2 C.sub.6 H.sub.4 CH.dbd.CH.sub.2,(C.sub.6 H.sub.5 O).sub.2 P(O)N.dbd.P(C.sub.6 H.sub.5).sub.2 C.sub.6 H.sub.4 CH.dbd.CH.sub.2,(C.sub.6 H.sub.5).sub.2 C.sub.3 N.sub.3 N.dbd.P(C.sub.6 H.sub.5).sub.2 C.sub.6 H.sub.4 CH.dbd.CH.sub.2 and(C.sub.6 H.sub.5)C.sub.3 N.sub.3 [N.dbd.P(C.sub.6 H.sub.5).sub.2 C.sub.6 H.sub.4 CH.dbd.CH.sub.2 ].sub.2 ; or(2) polymerizing p-diphenylphosphinestyrene and then oxidizing said polymerized p-diphenylphosphinestyrene monomer with an organoazide selected from the group of (C.sub.6 H.sub.5).sub.2 P(O)N.sub.3,(C.sub.6 H.sub.5 O).sub.2 P(O)N.sub.3,(C.sub.6 H.sub.5).sub.2 C.sub.3 N.sub.3 (N.sub.3) and C.sub.6 H.sub.5 C.sub.3 N.sub.3 (N.sub.3).sub.2. Copolymers can also be prepared by copolymerizing styrene with at least one oxidized styrylphosphine monomer selected from the group of:(C.sub.6 H.sub.5).sub.2 P(O)N.dbd.P(C.sub.6 H.sub.5).sub.2 C.sub.6 H.sub.4 CH.dbd.CH.sub.2,(C.sub.6 H.sub.5 O).sub.2 P(O)N.dbd.P(C.sub.6 H.sub.5).sub.2 C.sub.6 H.sub.4 CH.dbd.CH.sub.2,(C.sub.6 H.sub.5).sub.2 C.sub.3 N.sub.3 N.dbd.P(C.sub.6 H.sub.5).sub.2 C.sub.6 H.sub.4 CH.dbd.CH.sub.2 and(C.sub.6 H.sub.5)C.sub.3 N.sub.3 [N.dbd.P(C.sub.6 H.sub.5).sub.2 C.sub.6 H.sub.4 CH.dbd.CH.sub.2 ].sub.2.

    摘要翻译： 通过以下方法制备苯乙烯基单体的均聚物，共聚物和三元共聚物：（1）聚合至少一种选自以下的氧化苯乙烯基膦单体：（C6H5）2P（O）N = P（C6H5）2C6H4CH = CH2，（C6H5O） 2P（O）N = P（C6H5）2C6H4CH = CH2，（C6H5）2C3N3N = P（C6H5）2C6H4CH = CH2和（C6H5）C3N3 [N = P（C6H5）2C6H4CH = CH2] 2; 然后用选自（C 6 H 5）2 P（O）N 3，（C 6 H 5 O）2 P（O）N 3，（C 6 H 5）2 C 3 N 3（N 3））的有机锡化合物氧化所述聚合的对二苯基in yrene啉单体， 和C 6 H 5 C 3 N 3（N 3）2。 共聚物也可以通过使苯乙烯与至少一种选自以下的氧化的苯乙烯基膦单体共聚制备：（C6H5）2P（O）N = P（C6H5）2C6H4CH = CH2，（C6H5O）2P（O）N = P（C6H5 ）2C6H4CH = CH2，（C6H5）2C3N3N = P（C6H5）2C6H4CH = CH2和（C6H5）C3N3 [N = P（C6H5）2C6H4CH = CH2] 2。

    System for synchronizing synthesizers of communication systems
    42.
    发明授权
    System for synchronizing synthesizers of communication systems 失效
    用于同步通信系统的合成器的系统

    公开(公告)号：US4140972A

    公开(公告)日：1979-02-20

    申请号：US786322

    申请日：1977-04-11

    申请人： James C. Administrator of the National Aeronautics and Space Administration with respect to an invention of Fletcher ,  Edward A. Enriquez ,  Ronald E. Gookin

    发明人： James C. Administrator of the National Aeronautics and Space Administration with respect to an invention of Fletcher ,  Edward A. Enriquez ,  Ronald E. Gookin

    IPC分类号： H04B17/00 ,  H04B7/00

    CPC分类号： H04B17/345

    摘要： Frequency synthesizers at first and second stations that communicate with each other via a transmission link having a constant propagation delay time are started and synchronized by transmitting a tone from the first station to the second station via the link. The output frequencies of the two synthesizers correspond with each other and occur for the same length of time. At the second station, the tone is detected to cause the derivation of a tone burst having a predetermined frequency and duration. At the second station, a predetermined time interval after the derivation of the trailing edge of the tone burst, activation of the synthesizer at that station is initiated. The tone burst and frequencies derived from the synthesizer at the second station are transmitted in sequence from the second station to the first station via the link. At the first station, the tone burst is detected; detection of the trailing edge of the tone burst initiates operation of the synthesizer at the first station. The frequencies derived from the synthesizer at the second station are received at the first station and are combined with the frequencies derived from the synthesizer at the first station to derive a constant beat frequency as the two synthesizers are stepped.

    摘要翻译： 经由具有恒定传播延迟时间的传输链路相互通信的第一站和第二站的频率合成器通过经由链路从第一站向第二站发送音频来启动和同步。 两个合成器的输出频率彼此相对并发生相同的时间长度。 在第二站处，检测出音调以导致具有预定频率和持续时间的音调脉冲串。 在第二站，在音调脉冲串的后沿导出之后的预定时间间隔，启动该站处的合成器的激活。 从第二站的合成器得到的音调突发和频率经由链路从第二站发送到第一站。 在第一站，检测到音调突发; 音调突发的后沿的检测在第一个站处启动合成器的操作。 从第二站处的合成器得到的频率在第一站被接收，并且与从第一站处的合成器导出的频率相组合，以在两个合成器被阶梯化时导出恒定的拍频。

    Contour detector and data acquisition system for the left ventricular outline
    44.
    发明授权
    Contour detector and data acquisition system for the left ventricular outline 失效
    轮廓检测器和数据采集系统

    公开(公告)号：US4101961A

    公开(公告)日：1978-07-18

    申请号：US769148

    申请日：1977-02-16

    申请人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  Johan H. C. Reiber

    发明人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  Johan H. C. Reiber

    IPC分类号： A61B6/00 ,  G06T5/00 ,  A61B1/04 ,  G06F15/42 ,  H04N7/02

    CPC分类号： G06T7/0083 ,  A61B6/503 ,  G06T2207/10016 ,  G06T2207/10116 ,  G06T2207/30048

    摘要： A real-time contour detector and data acquisition system for an angiographic apparatus having a video scanner for converting an X-ray image of a structure characterized by a change in brightness level compared with its surrounding into video format and displaying the X-ray image in recurring video fields.The real-time contour detector and data acquisition system includes track and hold circuits adapted to be coupled to the video scanner for sampling the brightness level of predetermined sample points of the current video field in the region of the last detected border point; a reference level analog computer circuit connected to the track and hold circuits and responsive to the sampling of the brightness level of the predetermined sample points for generating a reference brightness level at which the next border point can be detected; and analog compartor connected to the reference level circuit for comparing the brightness level along a video scan line in the current video field with that of the reference brightness level to detect the next border point; a digital processor connected to the comparator and the track and hold circuits and responsive to the detection of a border point for enabling the comparator only within an area of the current video field covered by a narrow expectation window centered about the expected next border position and for determining the sample points to be sampled by the track and hold circuits; a field memory connected to and accessible by the processor for storing the coordinates of the detected border points in the preceding two video fields to partially define the center of the expectation window; and a computer interface connected to the comparators for storing the detected border points in the computer.

    Differential optoacoustic absorption detector
    48.
    发明授权
    Differential optoacoustic absorption detector 失效
    差分光声吸收检测器

    公开(公告)号：US4067653A

    公开(公告)日：1978-01-10

    申请号：US718266

    申请日：1976-08-27

    申请人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  Michael S. Shumate

    发明人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  Michael S. Shumate

    IPC分类号： G01N21/00 ,  G01N21/17 ,  G01N29/00 ,  G01J3/42

    CPC分类号： G01N21/1702

    摘要： A differential optoacoustic absorption detector employs two tapered cells in tandem or in parallel. When operating in tandem, two mirrors are used at one end remote from the source of the beam of light directed into one cell back through the other, and a lens to focus the light beam into the one cell at a principal focus half way between the reflecting mirror. Each cell is tapered to conform to the shape of the beam so that the volume of one is the same as for the other, and the volume of each receives maximum illumination. The axes of the cells are placed as close to each other as possible in order to connect a differential pressure detector to the cells with connecting passages of minimum length. An alternative arrangement employs a beam splitter and two lenses to operate the cells in parallel.

    摘要翻译： 差分光声吸收检测器采用串联或并联的两个锥形单元。 当串联操作时，在远离光束的光源的一端使用两个反射镜，该反射镜通过另一个反射回到一个单元中，并且将透镜以主焦点在主焦点之间聚焦到一个单元中 反射镜。 每个单元是锥形的以符合梁的形状，使得一个单元的体积与另一个相同，并且每个单元的体积接收最大照度。 电池的轴线尽可能靠近地放置，以便将差压检测器与具有最小长度的连接通道连接。 一种替代方案是使用分束器和两个透镜来平行地操作电池。