A study on Developing the Multifactor Style of Long-distance Education in the Grass Root of Western China; Generating and Delivering Multi-Channel Local Oscillation Signals with High Purity in Radio-over-Fiber System Remotely 开展西部基层远程教育多元化思路及问题研究光载无线系统中多路高纯度本振的远程传送
Generating and Delivering Multi-Channel Local Oscillation Signals with High Purity in Radio-over-Fiber System Remotely 光载无线系统中多路高纯度本振的远程传送
This commercial integrated chip can be used in the local oscillation circuit, high-accuracy clock generator and so on. 这种商用集成芯片可用于本振合成回路,高精度时钟发生器等。
The future local temperature evolution patterns in yunnan were forecasted by the retrieved nonlinear oscillation equations, and its average forecasting accuracy is 78.9%, which indicate that the equations have better forecasting ability and stability. 应用反演获得的描述各测站局地气温变化的有外源强迫非线性振荡方程做出未来云南局地气温演变趋势预报,其平均预报准确率约为78.9%。说明该模型具有良好的预报能力和预报稳定性。
Describes the occurrence of two local electric network oscillation accidents, analyses the causes for the oscillations and suggests corrective actions for the problems identified. 描述两起局部电网振荡事故过程,分析产生振荡的原因及暴露的问题,并提出了改进措施。
Analysis Of Two Local Electric Network Oscillation Accidents In Heilongjiang 黑龙江省两起局部电网振荡事故分析
The methods of local mesh refined, dynamic time step and lumped heat capacity matrix were introduced to resolve the numerical oscillation problem. 为了解决数值振荡问题,采用了局部网格细化、动态时间步长和集中热容矩阵等方法。
Applying convection equation describing local precipitation anomaly system and real-time meteorological observatory data, the nonlinear oscillation equation describing Kunming precipitation anomaly system was derived and retrieved. 从描述局地降水距平率系统的对流方程和实际气象观测资料出发,导出并反演了描述昆明局地降水距平率系统的非线性振荡方程。
Under external forcing condition, the local temperature amplitude of Yunnan oscillates with the oscillation of the external forcing. 考虑外源强迫的作用后,云南局地气温系统在其演变过程中只随外源强迫的振荡而振荡。
In this paper, error of quadrature vector detector used in direct converting receiver is analyzed and performance deterioration caused by gain error, phase error, local oscillation leak or DC offset on receiver's inphase and quadrature channels is discussed. 本文对直接变频接收机中正交矢量检测法进行了误差分析,讨论了由于接收机同相与正交两支路的增益差异、相位误差、本振泄漏及直流偏置导致其性能恶化的结果。
In transmitting mode, through controlling DDS, it produces the amplitude and phase weights needed by transmitting beam, and the local oscillation signal needed by upper frequecy conversion. 在发射模式下,通过控制DDS完成发射波束形成所必需的幅度、相位加权和上变频所必需的本振信号;
Abstract Asymptotic behavior of mathematical ecological models is an important conception with rich connotation, which mainly includes attractivity of the solutions, stability of the so-lutions ( local and global), periodicity and oscillation and so on. 数学生态模型解的渐近性主要包括解的吸引性、局部与全局稳定性、周期性、振动性等内容,这些性质刻划了系统局部或大范围的性态。
In receiving mode, through controlling DDS, it produces the local oscillation signal needed by down frequency conversion of the receiving signal. Then the DBF is used to form the receiving beam. 在接收模式下,则利用DDS技术产生接收信号下变频所必需的本振信号,然后采用DBF技术形成接收波束。
Study into the Method of Measurement of Agile Radar Local Oscillation lock-on precision 捷变频雷达本振跟踪精度测试方法研究
The simulation results show that the transient energy minimization control method for UPFC based on local measurable parameters is effective fordamping power system interarea oscillation. 仿真计算结果表明,这种基于本地可测量参数的UPFC暂态能量最小控制方法对抑制系统区域间振荡是有效的。
In this thesis, by employing Matlab software, numerical simulation for the heterodyne efficiency is carried out when the field distribution of local oscillation and the signal on the active area of detector follows the Airy pattern. 应用Matlab软件,对探测器光敏面上信号光与本振光均为艾里分布情况时,系统的外差效率进行数值仿真研究。
The PLL-based fractional frequency synthesizer possesses wide frequency band and fractional-N capability. Using the Sigma-delta fractional-N frequency control and information center regulation, it can meet the requirement of a digital TV receiver chip for local oscillation signals of each band. 所设计的基于PLL的小数频率合成器具有较宽的频带和小数分频能力,采用Sigma-delta小数分频控制和频率信息中心调节,满足数字电视接收芯片对各个频段的本地振荡信号的要求。
In the experiments, the local weak intensity silt tended to liquefy under wave actions, and the liquefied soil showed oscillation with wave actions. 试验发现粉土底床的局部软弱区域在波浪作用下会发生液化破坏,进而随波浪振荡滑动。
Numerical simulation for the heterodyne efficiency is analyzed when the field distribution of local oscillation is Gauss pattern and the signal is Airy pattern. 对信号光为艾里分布、本振光为高斯分布情况时,系统的外差效率进行数值仿真研究。
Heterodyne efficiency is directly related to the field distribution of the signal and the local oscillation on the active area of detector. 外差效率与信号光和本振光在探测器光敏面上的场分布直接相关。
The monitoring system can help user to monitor several system parameters, including the gain of each channel, frequency of local oscillation and the output of calibrating signal, and can communicate with PC via RS232 interface. 该监控系统能够检测8个通道的增益、本振信号的频率以及校准信号的输出状态等多个系统参数,并通过RS232接口实现与计算机终端的通信。
PSS currently used to suppress low-frequency oscillations of local oscillation mode, still can not effectively suppress the low-frequency oscillation modes between the regional power grid. 目前采用的电力系统稳定器(PSS)能有效抑制局部振荡模式的低频振荡,尚不能有效抑制区域间振荡模式的低频振荡。
Frequency synthesizers supply local oscillation signals for radio frequency transceiver, and realize frequency modulation, which influence performance of the whole wireless system significantly. 频率合成器为无线射频收发机提供本振信号和频率调制,是决定系统性能的关键电路。
Due to the influence of flow distribution, local pressure fluctuation and conjugated heat transfer, different oscillation phenomena appeared in the stages of transition, vigorous boiling and vapor single-phase flow. Local interface competition and diversified bubble dynamics phenomena were also observed. 受到流动分配、局部压力变化和热流耦合分布等因素影响,在过渡、旺盛沸腾和蒸气流阶段普遍出现振荡,局部竞争,以及气泡动力学多样性等现象。
The direct sampling microwave radiometer ( DSMR) is a novel microwave radiometer with simple structure, which substitutes wide-band, high-speed ADC of conventional microwave radiometer for mixer, local oscillation analog circuit and so on, direct samples the radio-frequency signals. 直接采样微波辐射计用高速、宽带ADC代替常规微波辐射计的混频、本振等模拟硬件电路,直接对射频信号采样,是一种结构简单的新型微波辐射计。
Only when the amplitude, phase and polarization of the local oscillation match strictly with that of the signal, can high heterodyne efficiency be obtained. The shape, size and performance of detector are also important factors that affect heterodyne efficiency. 只有当振幅、位相及偏振态等都严格匹配时,才可以获得较高的外差效率探测器形状、尺寸以及性能也是影响外差效率的一个重要因素。