Advanced Materials Research Vols. 468-471

Abstract: In order to study on the relationship between transmission parameters and transmission performance of wireless power transmission system based on the basic principles of magnetic resonant coupling, because of magnetic induction coupling with low-efficiency and short-distance, the basic circuit model of wireless power transmission system via Strongly Coupled Magnetic Resonances was analyzed. The expression of the parameters such as relationships between efficiency, frequency and distance was derived. Further more, the experiment of wireless power transmission system was designed based on the results of the analysis. At last, the results of experiment show that the theoretical derivation is correct and all the system is affected by the transmission parameters.

Abstract: Considering that there lacks study on the empirical identification and analysis of key risk factors of inventory financing, this paper uses SPSS to analyze the reliability and the validity of research data, revising the original index variables and sorting out the main risk factors, and finally establishing an ideal risk evaluation index system. The results of this paper provided a new research framework for risk identification of inventory financing.

Abstract: This paper analyzes the versatility of VHDL FSM coding and its presentation of various outputs. The analysis is based on the elevator controller project. The elevator controller was chosen because it serves as a typical digital controller system which boasts of numerous outputs like motor, lights, floor numbers, fire alarm, overweight ,beep ,direction arrows and others .Although not all outputs mentioned here are shown in the project codes but the few shown can illustrate how versatile is the VHDL FSM output representation. Other outputs can easily be added according to requirements.

Abstract: Considered waste glass and scrap aluminum as raw materials, preparation of waste glass and scrap aluminum composite materials by using mechanical mixing method. Composite material properties were studied by experiments. With the increase of the glass particles, the composite tensile strength and hardness are improved, wear resistance is increased much more than the matrix, it provides useful help of the use of waste.

Abstract: According to the difficult support problems of the roadway under the coal face on Dongtan Mine in China, a new reinforcing method using full-length grouted anchor is put forward. The strengthening principles are analyzed firstly, and the designing parameters are determined. At last the field construction is done in the north crosscut. The results show that the deformation is small and the roadway becomes stable. The good technical and economic results are obtained by the actual application.

Abstract: This article describes the SQL Server object model SQL-DMO. Through the object model all information of SQL Server's internal objects can be obtained, including databases, data tables, stored procedures and triggers and so on. Analysis the method of the object’s information extraction. Get the child object by analyzing the parent object’s collection property and get internal information by analyzing the object’s properties. A visual basic procedure is designed to achieve the table’s structure information for all user tables in specified SQL Server database. This method is more complete and simple than the method based on system table.

Abstract: Heavy metal removal by electrocoagulation using iron electrodes material was investigated in this paper. Several working parameters, such as pH, current density and heavy metal ions concentration were studied in an attempt to achieve a higher removal capacity. A simple and efficient treatment process for removal of heavy metals is essentially necessary. The performance of continuous flow electrocoagulation system, with reactor consists of a ladder series of twelve electrolytic cells, each cell containing stainless steel cathode and iron anode. The treatment of synthetic solutions containing Zn 2+,Cu 2+,Ni 2+,Cr 3+,Cd 2+ and Co 2+ ,has been investigated. Results showed that iron is very effective as sacrificial electrode material for heavy metals removal efficiency and cost points. Also it was concluded that the chromium has lower efficient removal as compared to zinc, copper and nickel. At the same time cadmium and cobalt have minimum removal efficiency.

Abstract: For requirements Permanent magnet synchronous motor (PMSM) speeds control, the digital signal processor (DSP) is used for speed control system of PMSM. By using space vector pulse width modulation (SVPWM) algorithm, system performance is improved, and system costs are reduced. In this paper, the principle of SVPWM is analyzed, and its implementation is described. Through the analysis of permanent magnet synchronous motor in a different coordinate system in the mathematical model system solution is presented, software design for system is described. A DSP-based PMSM speed control system is build, the system is analyzed in MATLAB simulation. That proves the feasibility of the system.

Abstract: This paper studies a new mill, which is developed particularly for the laboratory scale, with respect to the problems of low efficiency and bad adaptability of mills commonly used in laboratories. The paper briefly introduces the machinery construction, working principle, performance characteristics and grinding test methods. The main shaft of the mill is driven to rotate by the motor drive variable-speed system (speed control system), it could be equipped with cylinders of different volumes, the working speed and grinding intensity are adjustable; running cycle time is automatically controlled and adjustable, which eliminate the adverse effects caused by manual control errors. The results show that this machine could change the dosage scale of test materials in a large range, facilitate the grinding materials tests of different ores and different scales, and greatly improve the test efficiency and equipment’s adaptability.

Abstract: The hardware and software structure of the open CNC system is researched and constructed based on the open PMAC. Moreover, the communication software of the system is designed to realize the .function of the open CNC system based on PC and PMAC. The open CNC system has strong flexibility and broad application by adopting this technology.