A fundamental theory and features about local wave time frequency approach are discussed at first. The advantages of local time frequency are displayed by contrasting with others of time frequency approaches. Meanwhile its feasibility as time frequency approach is proved.
According to the good quality of timefrequency analysis, taking the leakage of fuel injection system of ship diesel engine as an example, this paper puts forward a new method to diagnose the faults of diesel. The new method applies the local wave timefrequency analysis method to analyze the vibration signal on the cylinder head surface of diesel.
Methods A total 30 patients who were performing coronary arteriography were included in this study. During coronary arteriography,the pulse wave time(PWT1) and the distance(L) of two fixed-point of aorta were measured. Then according to PWV1=L/PWT1,PWV1 was got.
In this paper,a new generated method and the specific circuit of modulating waveform for long-wave time service in transmitter.Fi- nally,it is introduced which preliminary test situation in transmitter.
The paper presents an analysis of the short wave time receiving data from 1982 to 1985 in our observatory is presented in this paper. The maxmum standard deviations for the annual and phase fluctuations are 0.16 ms and 0.26 ms respectively. A preliminary analysis for the effect of some factors on the accuracy of short wave synchronization and anomalous phenomena is also given in the paper.
Standazd time,frequency and time code are inserted in T.V signal which is transported by the Satellites in China and USSR. The timming precision is better than short wave time service. We also made Satellte Timming clock for Satellite time service.The price is cheap.