The low frequency exhaust noise of a diesel(4 85), its generation, frequency characteristics and influencing factors have been studied through theoretic calculation, analysis and experiment.
针对柴油机（4 85 ）低频排气噪声，对其产生机理、规律及其影响因素等作了理论计算、分析及实验。
A design method for low phase noise agile X-band frequency synthesizer is presented, the theoretic analysis and calculation is performed and the test results are given.
介绍一种低相噪、捷变频x波段频率综合器设计方法，并进行理论分析、计算，最后给出测试结果。
Theoretic analysis showed that the minimum jamming power could enter ST-FSK demodulator if frequency space were optimal.
理论分析证明，当频率间隔满足一定条件时注入ST-FSK解调器的干扰功率达到最小。
So, it has very wide applied fields and very important theoretic meaning to study, design and develop audio-frequency measurement technique to measure audio-frequency electric parameters.
因此，研究中频电参量的测量方法，设计和开发中频范围的电参量测量仪器，不但具有广泛的应用领域，而且还具有十分重要的理论意义。
The curves of its amplitude frequency response have some nonlinear features, such as inclination and jump phenomena of the curves , which coincide with the theoretic analysis.
参激横摇幅频响应曲线具有某些非线性特征，如曲线的倾斜和跳跃现象，这与理论分析是一致的。
The working frequency and crystal Angle for optimal sensitivity were obtained by theoretic analysis and experiments. Its practical application was satisfactory.
由理论分析和试验，给出了最佳灵敏度时换能器的工作频率和晶片倾斜角，实际应用效果良好。
A set of automatic control instrument of frequency and load with high reliability and convenient regulation has been produced, test of which shows theoretic analysis's correctness.
研制了一套可靠性高、调节方便的舰船电站自动频载控制装置。试验证明了理论分析的正确性。
About theoretic calculation for lightning electromagnetic field, two analytical methods are raised, which are dipole method in time domain and time-varying field method in frequency domain.
在雷电电磁场的理论计算方面，提出了两种方法，即时域中的偶极子方法和频域中的时变场方法。
Then we detect and estimate the carrier frequency of negative SNR DS-SS Signal have done. Theoretic analysis and simulation prove the validity of the arithmetic.
理论分析和仿真实验证明，在负信噪比条件下该方法可有效提高对DS-SS信号载波的检测能力。
Theoretic basis and application effect of using variable frequency regulation technique in power demand side were analyzed.
对电力需求侧采用变频技术的理论依据及实际应用中取得的效果进行了分析。
It can provide theoretic base ground for the mechanism using high frequency.
为该连铸机结晶器振动机构采用高频率振动提供依据。
The inevitability and feasibility of application of the grouping technique to production bf hi-frequency welded tubes are discussed from both theoretic and practical point of views.
从理论和实践方面论证了成组技术在高频直缝焊管生产中应用的必然性、可行性。
The associated key technology of electron apparatus's front analog input circuit is deeply researched, including high frequency circuit theoretic and high speed amplifier.
本文还对仪器前端模拟输入通道所涉及的一些关键技术进行了深入研究，研究内容主要包括高频电路设计理论和高速放大器技术。
The G-R relation between the earthquake magnitude and frequency has been an important premise in seismological study, but its actual distribution often deviates from its theoretic result.
地震震级频度的古登堡·里克特关系式(简称g - R关系式)一直是许多地震学问题研究的重要前提之一，然而实际分布常常与这一关系式有一定的偏离。
The G-R relation between the earthquake magnitude and frequency has been an important premise in seismological study, but its actual distribution often deviates from its theoretic result.
地震震级频度的古登堡·里克特关系式(简称g - R关系式)一直是许多地震学问题研究的重要前提之一，然而实际分布常常与这一关系式有一定的偏离。
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