查询词典 modulation

Modulation transfer function is an essential parameter which characterizes imaging quality of satellite optical camera.

1引言调制传递函数是对卫星光学相机成像性能进行评估的一个重要参数，该函数反映了相机的两个重要特性，即所成图像的分辨率和对比度，它是目前评价光学相机空间特性最好的参数[1]。

According to the system specification of DRM given by ETSI, the channel coding scheme applied to the system is a set of combination schemes of the multilevel coding and modulation.

根据欧洲电信标准化委员会提供的数字调幅广播系统说明书可知，该系统采用的信道编码方案是一套基于删除卷积码的多级编码和调制的组合方案，它机制灵活，可以针对不同的数据通道和不同的信道条件选择不同码率的分量码和星座图。

Simulation results are presented to prove the exactness and effectiveness of the modulation approach.

仿真结果证明了这种调制策略的正确性与有效性。

Methods:(1) Fura-2 based calcium imaging technique was used to examinate the effects of leptin on the basal [Ca2+]i, and the modulation effects of leptin on KCl-evoked [Ca2+]i increase in long-term cultured hypothalamic neurons.

对四个培养时间段的下丘脑神经元分别进行以下实验：(1)采用荧光钙离子成像技术，研究瘦素对细胞内静息钙离子浓度的影响，及其对25 mM KCl引起的细胞内钙升高的调节作用。

With optical feedback,the modulation frequency of output intensity is proportional to the ratio of external cavity length to internal cavity length.

有光回馈时，同时改变激光频率和外腔相位，激光器输出功率波动频率正比于内、外腔长度之比。

It is revealed that the maximum refractive index modulation coincides with the widest band gaps and the optimum volume fraction of the atoms is structure independent. The photonic bands of the face centered cubic ...

文中还计算了由各向异性介电小球构成的面心立方结构的光子能带并看到了禁带，这与各向同性介电小球构成的面心立方结构很不相同。

At the same time, the simplified calculation method, all round dead state configuration, universal over-modulation principle and fast output block technology of fault PWM signals have been put forward.

提出了简化的开关时间计算方法、完善的死区设置、通用的超调制原则以及故障信号高速闭锁的实现方法。

Is deeply studied in this paper,which involves FH pattern and the modulation and demodulation etc.

本文深入研究了美国推出的短波高速跳频CHESS电台的G函数算法，涉及到跳频图案、信息调制与解调等。

This thesis introduces the design and the realization of numerical frequency modulation high fidelity radio.

本文介绍了数字调频立体声收音机的设计与实现。

The CPM signal can be expressed as a sum of finite number of time limited amplitude modulation pulses by Laurent Decomposition. The optimum receiver of CPM is simplified by Laurent Decomposition.

引入了Laurent分解技术将非线性的CPM分解为一系列的PAM波形叠加的形式，利用Laurent分解的特性在保持性能的条件下给出了CPM的最佳接收机的简化模型。

"The operators will suffer a temporary decrease in the number of consumers and short message services as people may not like having to provide their ID cards for a phone number," Xu Junqi, vice-dean with the Policy-Making Institute of the Telecommunications Research Centre under MII, said yesterday.

信息产业部下属的通信决策研究院副主任徐俊其昨天说：&实行手机实名制后，人们可能不太情愿用身份证注册手机号，所以通信运营商会暂时面临用户减少和短信用户减少的问题。&

I don't believe in make-believe!

我不相信这些虚构的故事。