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1. The new thing's appearance must have the running-in period.

2. The emphasis of this paper is running-in quality optimization question in the process of engine test.

3. Therefore the quantitative analysis of running-in process can be carried out by fractal dimension and multifractal spectrum of the sequence signals of the friction force.

4. Especially in engine running-in period before use, correct checking methods should be adopted to avoid the damage caused by incorrect ways.

5. The result of running-in indicates that the refitting project is feasible.

6. If the running-in stage to advance aware of abnormal temperature rise, leakage, vibration and noise, they should check stands.

7. While new hotels need a long running-in period, most of our employees have worked here for over 10 years, they are good enough to impress our guests.

8. The running-in wear mechanisms are very complicated, simultaneously accompanied by plough, adhesive, fatigue, oxidative and lubricated wear, etc.

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9. The fractal theory is introduced and variations of running-in surface topography are characterized by fractal parameters in this paper.

10. The new running-in specifications of transmission, having the strengthening effect, was estimated by the results of strengthening under low amplitude load of single tooth bending of cylindrical gear.

11. A high running-in quality is based on optimized running procedure and accurate evaluating method.

12. Black oxidizing or phosphatizing processes for improving the running-in behaviour or the capability to run without lubrication have been in use for quite a long time.

13. This article studied the effect of CA6110Z-07Y diesel running-in process on bench in different running-in oil with oil monitoring technology.

14. This paper presents the application of multiwire technology in the microcomputer control system of automobile running-in test.

15. The wear process of the composite was composed of running-in and steady state wear.

16. It also expounds influences of hardness and roughness of teeth surface, lubrication, running-in before use on touch strength of gear.

17. It is shown that the fractal parameters are simple and effective to characterize the variations of surface topography during running-in process.

18. The studying means, studying method and studying achievement are universal applicable to running-in study of marine engine, automotive engine and locomotive engine.

19. Based on the L-M rule of BP neural network, a running-in model was established with fractal parameters.

20. As a key link of last process in production, the importance of diesel engine running-in on test bed has been approved owing to vital effect on the safety, reliability and lifetime.