Papers by Keyword: Summary

Abstract: Research on reliability of distribution network has very important meaning and function to ensure the quality of power supply. This paper introduces some basic concepts of reliability in distribution network, including distribution network reliability definition, task and index. The classical reliability evaluation method was reviewed, and focused on specific distribution network, an example analysis was given, and specific reliability evaluation indexes were calculated. Finally, the future development of distribution network reliability evaluation was made a simple prospect.

Abstract: The basic mathematical method for power system reliability evaluation was indicated, the simple and complex system was respectively introduced, several methods of reliability analysis of simple was given in this paper, and the reliability evaluation indexes system and methods of composite generation and transmission system was analyzed, then focused on state enumeration method applied in the reliability assessment of system, the detailed example analysis was given and the adequacy reliability indexes were computed in detail. Finally, the current reliability evaluation and status of composite generation and transmission system was summarized simply and its reliability evaluation algorithm steps applied in current actual engineering projects was given.

Abstract: The stability analysis and evaluation is the base of the landslide prevention, at the same time have improvement guidance to the landslide prediction. Divided the Chinese landslide stability analysis of research history into three stages:①experience analysis and evaluation stage;②half experience and semi theoretical analysis and evaluation stage;③theoretical development and the deeping stage. Described the research situation,trend and existing problems of the slide stability analysis and evaluation,get a clear conclusion,put forward my own understanding.

Abstract: The paper summarizes the research progress of analytical method of sulfur element in iron-base alloys as of 2012. Major analytical methods for sulfur element in iron-base alloys include infrared absorption, photoelectric direct reading spectrometry, inductively coupled plasma atomic emission spectrometry, ion chromatography method, mass-spectrography, and electrochemical method. The paper also predicts the future trend of the analytical methods for sulfur element in iron-base alloys.

Abstract: The formation of burr is a common phenomenon in metal cutting, its formation and variation directly affects processing quality and production efficiency of the workpiece. It is one of the key technologies which were applied in precision or super-precision manufacture and automatic processing. Burr expert system is not only a communication platform between burr formation mechanism and burr removal technology, but also an important channel that promote the development of burr-free cutting technology. It was highly concerned by mechanical engineering experts and scholars at home and abroad. This study develops neural network (NN) metal cutting burr expert system with network function, facing the application of burr removal technology, making use of neural network technology and expert knowledge system technology, and closely integrating experimental study of metal-cutting burr. Combined with milling, the study on prediction burr sizes using the system is carried out. The results show that the predicted results and the experimental results are in good agreement, which demonstrates the system is feasible and effective.

Abstract: t was well known to the world that the dams were critical construction measures to regulate and control water resources, optimize the water distribution, and the important component of flood-prevention system. For the sake of providing beneficial basis for the study on monitoring of dam security, we summarized the research status of dam security monitoring from 3 aspects: the connotation, impact factors and development tendency. Combining with our practical experiences, the recommendations on dam security monitoring were suggested in this paper: (1) Automation, digitization and integration were the final development tendency of dam security monitoring; (2) Basic study should be combined with apply study, and the basic study need to serve apply study; (3) Basic studies need to pay much emphasis on the Reference from multi-fields, applying excellent study achievements from other fields to the monitoring of dam security, such as mathematics and computer fields; (4) New devices such as 3-d laser scanner should be popularized, and the costs of related elements should be decreased. Moreover, related equipments which could improve the monitoring precision need to be input more human and material resources in the R&D process, in order to increase the reliability of monitoring results.

Abstract: At present years, the photovoltaic industry has a rapid development. The research of related technologies also has made tremendous progress. The photovoltaic power generation system includes the solar array, controller, batteries, inverter, electricity load, etc. In this paper, combining with domestic and foreign research status quo, respectively summarizes four aspects of photovoltaic system technology, the maximum power point tracking, DC converter, inverter and islanding detection.

Abstract: Seedling auto-picking device is one of the most important working parts of a vegetable automatic transplanter. Its performance determines the transplanting quality, reliability and operation efficiency. The current developments of the seedling auto-picking device were discussed, and several typical devices were introduced in this paper. The existing problems of seedling auto-picking devices of different picking methods were pointed out. With the advantages of accurate location, high efficiency and easy picking, the mandril-type seedling picking was thought as the better transplanting mode of vegetable plug seedling. At the same time, the development direction of auto-picking devices of vegetable automatic transplanter was provided.

Abstract: The solar energy is the most promising energy to solve energy crisis and environmental problem. Quantum dot can be applied to solar cells in two structures of QDSC to improve the energy conversion efficiency. The two structures are p-i-n type QDSC and quantum dots sensitized solar cells. The energy conversion efficiency of p-i-n type QDSC may increase up to 45%. Both CdSe and CdS quantum dot can be used as the sensitizer of the QDSSC and each of them has its demerits and merits, but the conversion efficiency of QDSSC is low if they were used respectively. Thus, in order to overcome their demerits respectively, we could try to combine their merits. QDSC is the most promising technique to solve the problems of solar cell. But before large-scale application their efficiency and stability should be improved.

Abstract: This paper summarizes the robot moving platform mobile mode, elaborated with emphasis the hybrid mobile platform some research results, analyzes its characteristics and shortcomings, and the hybrid robot moving platform is the future development direction .