1. The principle of simplified four-quadrant multiplier was discussed.

2. The four-quadrant convertor experiment which is under the transient direct current control has been finished. The experimental result proves the correctness of the analysis conclusion.

3. Matrix rectifier is a true four-quadrant buck AC-DC converter, and it is can be applied in all kind of DC power supply fields powered by three-phase mains.

4. Four-quadrant detector errors affecting the accuracy of laser-guided system mostly, so algorithm design is the root of improving the accuracy in guidance system.

5. Eight-petaline pattern of maximum shear stress and four-quadrant pattern of the mean stress, centered the weakening segment of fault, may be considered as possible sign of the seismogenic fault.

6. The circuit topologies family include single four-quadrant power switch mode, push-pull mode, half-bridge mode, and full-bridge mode circuits.

7. The system error introduced by the four-quadrant photocell and the error correction method are analyzed emphatically.

8. According to the levitation principle of hybrid-levitation, a four-quadrant convert is designed to adopt hybrid-levitation system.

9. Based on the models of the four-quadrant photodetector, general methods for physical models are also summarized.

10. According to spot in the four-quadrant detector photosensitive surface position to calculate the ship's yaw angle relative to the laser source.

11. Under steady state, the four-quadrant working principle of PWM rectifier has been explained here, the key for which has been found to be ac-side current control.

12. A four-quadrant photocell is used in the system to replace photoelectric cell, and it acts both as centering detector and light intensity detector.

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13. four-quadrant analysis is a method to process investigation data which is very useful for it.

14. Simultaneously, four-quadrant converter capacity problem's simulation and analysis have been done, too.

15. To effectively implement laser jamming, the effects on four-quadrant laser guiding detector of high power laser needs to be determined.

16. In this paper excellences of switched capacitor circuit are summarized. And asr new-type of four-quadrant analog multiplier with switched capacitor technol-logy is given.

17. Analysis the realization of the direct torque control used in asynchronous motor's four-quadrant operation.

18. The experiment came into use single light path critical angle method, output signals were detected by four-quadrant receiver, micro-displacement drive element were piezoelectric ceramics.

19. This article puts forward a plan to control the four-quadrant converter system by using a kind of single-chip microcomputer: 8098, and gives the testing waveform.

20. The purpose is to introduce the signal processing system of position detection based on four-quadrant infrared detector.

21. The world's only manufacturer who complete master the core technology of High-end four-quadrant high voltage variable frequency.

22. The main work of this paper is as follows:1. Design the laser displacement sensor based on the four-quadrant detector, And debugging, calibration and testing of the sensor.

23. The photoelectric conversion characteristic and detecting principle of the four-quadrant photo detector as position sensitive device are discussed in detail in theory applied to laser alignment.

24. The poser controlling system of the fly-wheel needs to be realized by means of four-quadrant torque servo control.

25. The gold standard procedure for detecting Barrett's esophagus is to conduct a standard video endoscopy followed by four-quadrant biopsies.