Process for the hot isostatic compression of silicon nitride bodies
reinforced with carbide fibres and carbide whiskers
    114.
    发明授权
    Process for the hot isostatic compression of silicon nitride bodies reinforced with carbide fibres and carbide whiskers 失效
    用碳化硅纤维和碳化钨加固的硅氮化物体的热稳态压缩方法

    公开(公告)号:US5106793A

    公开(公告)日:1992-04-21

    申请号:US399504

    申请日:1989-09-11

    CPC classification number: C04B35/806 C04B35/6455

    Abstract: Carbide fiber- and carbide whisker-strengthened silicon nitride bodies are hot-isostatic pressed without encapsulation of the pressureless pre-sintered formed body at temperature between 1000.degree. and 3000.degree. C. in a nitrogen-protective gas atmosphere. At a low nitrogen partial pressure but high total gas pressure, a maximum consolidation can be achieved already at relatively low temperatures without destruction of the carbide fibers or carbide whiskers.

    Abstract translation: PCT No.PCT / EP88 / 00205 Sec。 371日期1989年9月11日 102(e)日期1989年9月11日PCT提交1988年3月15日PCT公布。 出版物WO88 / 07029 日期:1988年9月22日。碳氮化硅碳化硅碳化物体在氮保护气体气氛中在1000〜3000℃的温度下不经无压预烧结体体积而进行热等静压 。 在低氮分压但总气体压力高的情况下,可以在相对较低的温度下实现最大的固结,而不会破坏碳化物纤维或碳化物晶须。

    Directly mixing receiving system
    115.
    发明授权
    Directly mixing receiving system 失效
    直接混合接收系统

    公开(公告)号:US4408351A

    公开(公告)日:1983-10-04

    申请号:US115213

    申请日:1980-01-25

    Abstract: In a broadcast signal receiving system, which includes a phase control loop composed of a first mixer having two inputs and an output and arranged to provide at its output a signal proportional to the product of the signals applied to its two inputs, one output being supplied with the received high frequency signal, a voltage controlled oscillator connected for supplying to the other input of the first mixer an alternating voltage of substantially constant amplitude, a first lowpass filter connected to the output of the first mixer for providing a filtered output signal representative of the first mixer output signal with the sum frequency component of that signal suppressed, and means for delivering the output signal of the first low-pass filter to the control input of the oscillator, the received high frequency signal is directly demodulated by multiplication with a local oscillator signal synchronized to a substantially fixed difference to the phase or the carrier phase of the received high frequency signal.

    Abstract translation: 在广播信号接收系统中,其包括由具有两个输入的第一混频器和输出组成的相位控制回路,并且被布置成在其输出处提供与施加到其两个输入端的信号成正比的信号,一个输出被提供 与所接收的高频信号相连接的压控振荡器,连接用于向第一混频器的另一输入提供基本恒定幅度的交流电压;第一低通滤波器,连接到第一混频器的输出,用于提供表示 抑制了该信号的和频分量的第一混频器输出信号,以及用于将第一低通滤波器的输出信号传送到振荡器的控制输入的装置,接收到的高频信号通过与本地 振荡器信号与接收器的相位或载波相位同步到基本上固定的差 ved高频信号。

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