are switch board , rotor board and braces made of epoxy board , vulcanized fiber paper board , etc

1、

polymeric materials - industrial laminates, filament wound tubing, vulcanized fiber, and materials used in printing wiring boards

聚合材料。印制线路板用工业层压板、丝绕管件、硫化纤维和材料

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2、

this paper mainly introduces a project of pd radar velocity tracking. the working status of certain pd radar when it encountered the jamming of velocity deception is analyzed and studied by computer simulation technology based on matlab/ simulink.

主要介绍了一种机载PD雷达的速度跟踪方案，利用MATLAB/Simulink计算机仿真技术分析和研究了某机载PD（脉冲多普勒）雷达在受到速度欺骗干扰时的工作情况。

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3、

materials and methods: sixty-two patients with persisting bleeding after drug induced abortion were observed with two-dimensional ultrasound and color doppler flow imaging ( cdfi).

材料和方法：对62例药物流产后阴道流血患者进行二维超声和彩色多普勒（CDFI）观察，用脉冲多普勒（PWD）测量子宫肌壁及宫腔残留物内血流参数；

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4、

these are the important indices for diagnosis of the malignant gestational trophoblastic tumors and have important value in supervising the effect of chemotherapy and in choosing the treatment plan.

结论彩色多普勒超声显示病灶异常血流图像和脉冲多普勒检测RI低值是诊断恶性滋养细胞肿瘤的重要指标，对监测化疗效果、选择治疗方案均有十分重要的价值。

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5、

a method of phase code named sz code to mitigate range ambiguity applied on a pulse doppler weather radar is introduced.

描述一种被称为SZ相位编码的解距离模糊方法在脉冲多普勒气象雷达中的应用。

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6、

changes of color flow signals in carotid arteries were recorded by color flow imaging ( cfi) and by pulsed doppler ( pd).

彩色血流显像（CFI）及脉冲多普勒（PD）分析颈动脉血流变化。

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7、

the diagnostic values of the combination technique of the two-dimensional ultrasound ( 2d), color and pulse doppler ( cd and pd) on the different kinds of thyroid diseases were evaluated.

探讨二维图像（2D）、彩色及脉冲多普勒超声（CD及PD）联合应用对各类甲状腺疾病的诊断价值。

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8、

methods: various parameters of the pv flow and mitral flow spectrum in 132 cases of lv dysfunction and 90 healthy cases were determined by pulse doppler echocardiography.

方法：应用脉冲多普勒技术对132例左心功能Ⅰ～Ⅳ级的CHD患者及90例健康人（正常对照组）进行了肺静脉血流频谱各项参数的测定并进行对照研究。

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9、

pulse doppler ( pd) processing method, which is widely applied in airborne radar systems, is mainly used in radar systems that detect moving targets under strong clutter background.

脉冲多普勒（PD）处理方法主要应用于那些需要在强杂波背景下检测运动目标的雷达系统，在机载雷达系统中广泛应用。

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10、

objective to evaluate nut-cracker syndrome ( ncs) with two-dimensional ultrasound ( 2d), color doppler flow imaging ( cdfi) and pulse doppler ( pd).

目的探讨二维超声（2D）、彩色多普勒血流显像（CDFI）和脉冲多普勒（PD）诊断左肾静脉受压综合症（Nut-CrackerSyn-drome，简称NCS）的价值。

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11、

the glc-12 type x-band fully coherent pulsed doppler weather radar technology with dual-linear polarization capability

GLC-12型X波段全相参双线偏振脉冲多普勒天气雷达技术

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12、

pulse signals in advanced pulse doppler ( pd) radar have features of coherence and correlation, thus can greatly improve the anti interference ability of the radar.

先进的脉冲多普勒（PD）雷达采用的信号脉冲具有相参性，又能进行相关处理，极大地提高了其抗干扰性能。

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13、

modulation of pulse doppler frequency based on software drfm

基于软件DRFM的脉冲多普勒调制

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14、

conclusion: doppler and ivc contrast ultrasonography were helpful for the diagnosis of ivc syndrome.

结论：脉冲多普勒及IVC声学造影可进一步帮助明确诊断。

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15、

the spectrum characteristics of synchronous jamming on range and velocity are analyzed. a method for a pd radar to counter the jamming is also discussed.

分析了存在距离-速度同步拖引干扰时的信号频谱特征，研究了一种脉冲多普勒（PD）雷达抗距离-速度同步拖引干扰的方法。

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16、

the pulse doppler ( pd) radar technique in ground-based radar is mainly applied to detecting motive targets in strong clutter jamming circumstance.

地面雷达中的脉冲多普勒（PD）技术主要用于在强杂波背景下对动目标的检测。

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17、

the characteristics of the ground and sea clutter have some important effects on the airborne pd radars with look down mode.

地海面杂波特性对主要采用下视工作方式的机载脉冲多普勒（PD）雷达具有十分重要的影响。

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18、

experimental research of dbs imaging based on airborne pulse doppler radar

机载脉冲多普勒雷达DBS成像实验研究

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19、

design of image simulation of airborne pd radar based on vega

基于Vega的机载脉冲多普勒雷达图像仿真设计

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20、

mitral inflow velocity e, a and e/ a ratio were detected.

在二尖瓣口用血流脉冲多普勒法（PWD）测舒张期血流E峰、A峰、E/A比值。

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