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调制器    
相关语句
  modulators
    The resolution of Σ-ΔA/D converters mainly depends on their Σ-Δmodulators.
    Σ-ΔA/D转换器的分辨率主要由它的Σ-Δ面调制器决定。
短句来源
    Quantization noises of three types of Σ-Δmodulators are analyzed based on a linearized model'By using signal flow graphics method,each transfer function,quantization noise and quantization signal-to-noise ratio(SNR) is derived respectively. The results obtained are instructive for using Σ-ΔA/D converters correctly.
    利用线性化模型对常用的3种Σ-Δ面调制器结构的量化噪声进行了分析,采用信号流日力法分别推导了这3种调制器量化噪声的传输函数及其量化信噪比,所得结果对Σ-ΔA/D转换器的正确使用具有重要意义。
短句来源
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  modulator
Design of a piezoelectric transducer cylindrical phase modulator for simulating acoustic emission signals
      
To conveniently carry out the pipeline leak experiment in a laboratory, leak acoustic signals are simulated by using the converse piezoelectric effect of a piezoelectric transducer (PZT) cylindrical phase modulator.
      
On the basis of the piezoelectric equations and electromechanical equivalence principle, the transfer function of a PZT cylindrical phase modulator is delivered.
      
A PZT cylindrical phase modulator is designed, and the numerical simulation is conducted.
      
Results prove that the PZT cylindrical phase modulator can effectively simulate leak acoustic emission signals when the frequency is lower than 25 KHz.
      
更多          
  modulator
Design of a piezoelectric transducer cylindrical phase modulator for simulating acoustic emission signals
      
To conveniently carry out the pipeline leak experiment in a laboratory, leak acoustic signals are simulated by using the converse piezoelectric effect of a piezoelectric transducer (PZT) cylindrical phase modulator.
      
On the basis of the piezoelectric equations and electromechanical equivalence principle, the transfer function of a PZT cylindrical phase modulator is delivered.
      
A PZT cylindrical phase modulator is designed, and the numerical simulation is conducted.
      
Results prove that the PZT cylindrical phase modulator can effectively simulate leak acoustic emission signals when the frequency is lower than 25 KHz.
      
更多          
  modulators
This paper summarizes the results from molecular modeling of various multidrug resistance (MDR) modulators and the MDR protein P-glycoprotein (P-gp).
      
Synthesis and Biological Evaluation of Allosteric A1-Adenosine Receptor Modulators Structurally Related to (2-Amino-4,5,6,7-Tetr
      
Dyes with Properties of Modulators of Redox Processes As Potential Immunotropic Agents
      
The differentiating effect of DMSO on K562 cells was studied against the background of pretreatment of the cells by the modulators of activities of protein kinase C and Ca signaling, phorbol 12-myristate 13-acetate, and ionophore A23187.
      
The Ca2+ uniporter was shown to be specifically activated by low concentrations of physiological modulators such as ADP, NADH, spermine, and Ca2+ itself.
      
更多          
  pulse modulator
Studies are made of a pulse system consisting of a nonstationary continuous linear portion and a pulse modulator connected to a feedback circuit.
      
A problem of synthesis of a signal at the input of the pulse modulator, which stabilizes the system, is solved.
      
Bias pulse modulator for a high power Kα band (26-40 GHz) impact oscillator
      
Main parts of rf source for the rf-gun consists of 10 MW s-band klystron and a small pulse modulator.
      
This pulse modulator can give good stability and flatness of the output RF pulse.
      
更多          


The resolution of Σ-ΔA/D converters mainly depends on their Σ-Δmodulators.Quantization noises of three types of Σ-Δmodulators are analyzed based on a linearized model'By using signal flow graphics method,each transfer function,quantization noise and quantization signal-to-noise ratio(SNR) is derived respectively.The results obtained are instructive for using Σ-ΔA/D converters correctly.

Σ-ΔA/D转换器的分辨率主要由它的Σ-Δ面调制器决定。利用线性化模型对常用的3种Σ-Δ面调制器结构的量化噪声进行了分析,采用信号流日力法分别推导了这3种调制器量化噪声的传输函数及其量化信噪比,所得结果对Σ-ΔA/D转换器的正确使用具有重要意义。

According to Darcy's law, the authors developed a mechanical field permeameter (MFP), which is easy to be carried with anduseful in systematical measurement of rock permeability, not only for the outcrop rocks but also for hand specimens or coresin laboratory. MFP is composed of three parts, which are pressured gas source, modulator and gas probe, respectively. Itmakes the high pressured gas pour into the rocks by the probe closed to the surface of the measured object, records the gasflow rate and pressure when...

According to Darcy's law, the authors developed a mechanical field permeameter (MFP), which is easy to be carried with anduseful in systematical measurement of rock permeability, not only for the outcrop rocks but also for hand specimens or coresin laboratory. MFP is composed of three parts, which are pressured gas source, modulator and gas probe, respectively. Itmakes the high pressured gas pour into the rocks by the probe closed to the surface of the measured object, records the gasflow rate and pressure when penetrating the rock surface and finally gets the permeability value based on the relationshipamong them. MFP has been used to measure 400-500 experimental data each day so as to acquire concentrated distribution da-ta of permeability quickly, hence it is convenient to study the permeability distribution of complicated sand bodies at outcrop.The analysis of data error dernonstrates that permeability error from the MFP is random-dependent. Taking the sand body inQiktim outcrop in Turpan-Hami basin as an example, this paper presents MFP's application in the study of the characteristicsof permeability heterogeneity and pattern.

依据达西定律,研制了机械式野外用微型渗透率仅(MFP)。MFP携带方便,可系统测量岩石的渗透率,对测量对象不具损坏性,既便于野外测量露头岩石,也适于在实验室测量手标本或若心。MFP由承压气源、调制器和注气探头3部分装置组成,通过闭合作用在测量对象表面的探头,将高压气体注入岩石,测得透过岩石作用面的气体流量和相应压力,再据渗透率与它们的关系换算出渗透率数据。根据经验,用MFP每天可测量400~500个点的数据,可快速获得密点集渗透率空间分布数据,非常便于在野外按地层进行复杂砂体的渗透率分布研究。数据误差分析表明,用MFP方法获得的渗透率数据误差属随机性误差。以对吐哈盆地七克台剖面露头砂体的研究为例,介绍了MFP在研究砂体渗透率非均质性特征及模式方面的实际应用效果。

Introduced herein is a portable instrument for testing and maintaining 3506XA pulse coder modulation (PCM) adapter. The transmission mode of 3506 PCM and its hardware structure and software flow chart are analyzed. A single chip microcomputer with data processing program is used to decode and process 3506 PCM signal, with which operator can get visual data from the downhole tool easily. Thus it is convenient for the tool to be compatible with surface instrument, tested and maintained.

介绍了一种用于测试维修 35 0 6 XA脉冲编码调制器井下仪的便携式仪器。对 35 0 6 PCM传输方式进行了分析 ,介绍了仪器的设计思路、硬件结构和软件流程。仪器采用单片微型计算机对 35 0 6 PCM信号解码 ,辅以数据处理程序 ,使操作者能够直观地获取井下仪传输的数据 ,以便对井下仪进行配接、测试、维修。

 
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