查询词典 passive system

By using methods of passivity and switching control, the linear subsystem is transformed into a robust strictly passive system and it is asymptotically stable independent of the switching policy.

用同样的方法解决了一类具有结构不确定性的多输入非线性级联系统的鲁棒不变切换控制问题。

The principle and composition of the passive hydrogen maser is introduced briefly,and an application of digital frequency modulation and digital servo to the passive hydrogen maser for improving the performance of the clock is expounded.The final test and analysis of the system are presented and the data indicate that the stability of the present system is much better than that of the original one.

简单介绍了被动型氢原子钟的组成及原理，阐述了基于数字调频和数字伺服的电子电路在被动型氢原子钟上的应用，并给出了设计的最终测试结果及其分析，数据表明该系统的稳定度比原有系统有很大提高。

Passive power filters is adopt widely because it is simple configuration, convenient maintenance, low cost and etc. Otherwise, passive power filters is easy affect by change of system parameters, can' t remove sequential harmonics, and easy arose series and parallel resonance with system.

无源电力滤波器由于其结构简单，维护方便，造价低廉等优点仍然成为目前普遍采用的一种滤波手段，但是无源电力滤波器受到系统结构变化影响较大，不能消除连续谐波，且容易和系统阻抗发生相互作用，引起串联、并联谐振，严重时甚至使系统崩溃。

On the other hand, from the point of view of work manner, thedetecting systems can be classified two kinds: the active and the passive systems. Althoughthe passive detecting system can\'t get so much information as the active one, it has itsspecial characteristic. For instance, the passive system is immune to the radar clutter. It issecreting and has no electromagnetic pollution due to none of radialization. The passivesystem also has excellent capability of detecting the target covered with the stealth material.

从工作方式来看，探测系统还可分为主动和被动两种方式，虽然主动工作方式可以获得关于目标的更多信息，但是被动工作方式也有其不可替代的特性，如不受闪烁效应的影响；由于本身不发射电磁波，因而没有电磁污染及工作比较隐密；对覆盖吸波材料的目标探测能力很强等。

Because thedetecting of the metal object is important in both military and civil applications, wefocused on the aim and do lots of measurement of the radiometric characteristic ofseveral objects correlating to the metal detecting and got the datum. We also completedthe inversion algorithm of retrieving the brightness temperature from the measureddatum.2 The radiometer is the apparatus of incepting the MMW radialization and is the key partof all passive MMW detecting and imaging system. Our emphasis of radiometerresearch was on a kind of AC radiometer, we discussed its principium, composing andthe recovery of its distorted output signal. Finally we gave out the design of the ACradiometer.3 The focal plane system is the main passive MMW detecting and imaging system atpresent.

由于对金属目标的探测在军民应用两方面都很重要，因此文中围绕着对金属目标探测这一中心，对几种相关物体的毫米波辐射特性进行了大量测量实验，获得了相关数据，并进行了亮温反演，给出了计算结果。2毫米波辐射计是接收物体毫米波辐射的高灵敏度接收机，是所有被动毫米波探测成像应用的核心部件，因此文中对毫米波辐射计进行了相关研究，重点研究了用于扫描探测的交流辐射计的原理、构成及其失真信号的补偿问题，并完成了一种交流辐射计的系统设计。3毫米波焦平面系统是当前被动毫米波探测成像的主流系统。

Because thedetecting of the metal object is important in both military and civil applications, wefocused on the aim and do lots of measurement of the radiometric characteristic ofseveral objects correlating to the metal detecting and got the datum. We also completedthe inversion algorithm of retrieving the brightness temperature from the measureddatum.2 The radiometer is the apparatus of incepting the MMW radialization and is the key partof all passive MMW detecting and imaging system. Our emphasis of radiometerresearch was on a kind of AC radiometer, we discussed its principium, composing andthe recovery of its distorted output signal. Finally we gave out the design of the ACradiometer.3 The focal plane system is the main passive MMW detecting and imaging system atpresent.

由于对金(来源：ABc1C论文8f8f网www.abclunwen.com)属目标的探测在军民应用两方面都很重要，因此文中围绕着对金属目标探测这一中心，对几种相关物体的毫米波辐射特性进行了大量测量实验，获得了相关数据，并进行了亮温反演，给出了计算结果。2毫米波辐射计是接收物体毫米波辐射的高灵敏度接收机，是所有被动毫米波探测成像应用的核心部件，因此文中对毫米波辐射计进行了相关研究，重点研究了用于扫描探测的交流辐射计的原理、构成及其失真信号的补偿问题，并完成了一种交流辐射计的系统设计。3毫米波焦平面系统是当前被动毫米波探测成像的主流系统。

RECCO is a passive system, which means that there is no need for batteries or maintenance and nothing to turn on or off.

RECCO是一个中性的系统，意味着不需要电池和维护，也没有开关。

Lastly, in accordance with the actual situations of the prototype structure of mosque pagoda, based on the similar relation of model experiments, a model structure of mosque pagoda with a similar coefficient of 1/10 is designed and fabricated. Earthquake simulating shaking table tests are performed on the model structure of pagoda in the cases the AB type passive control system with SMA dampers is erected or unerected. The leading earthquake responses like the relative drift at the top of the main tower and the small tower, interstory drift ratio, acceleration, and cracking process of the pagodas body etc. are studied. The operational behaviors involving the deformation capacity and energy dissipation capacity is tested for passive control system with SMA dampers under the earthquake excitation, and the corresponding control mechanism and regularity is also analyzed. Furthermore, the performance changes and protection effectiveness is comprehensively evaluated while the model structure of pagoda is seismically protected or not.

最后，根据光塔原型结构的实际情况，以模型试验的相似关系为基础，设计并制作了一个相似系数S，为1/10的光塔模型结构，并先后进行了未安装和安装A、B型SMA阻尼器被动控制系统光塔模型结构的地震模拟振动台试验，研究了模型结构在3种不同工况下，主塔顶部和小塔顶部的相对位移、层间位移角和加速度以及塔体开裂等光塔结构的主要地震反应，测试了SMA阻尼器被动控制系统在地震激励下的变形能力和消能能力等工作性能，分析了相应的控制机理和控制规律，并从总体上评价了光塔模型结构抗震保护前后的性能变化和保护效果。

The taxiing performance of an active control system landing gear and that of a passive system landing gear are compared.

对主动控制起落架和被动起落架的滑行性能进行了比较。

Combined with the Innovative Foundation Project in High Technological Development-Plan of Ministry of National Science and Technology (i.e. a research on passive localizing system based on a non-co-operative transmitter like as Television and FM broadcast), we investigated on signal detection and estimation methods in passive localizing system in detail.

结合科技部高技术发展计划创新基金项目——&基于电视、调频广播等非合作性照射源的无源探测定位系统&，作者对基于电视、调频广播信号的无源探测定位系统中的弱信号检测与参数估计算法进行了深入研究。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。