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The influences of magnetized water on the mechanical and optic properties of concrete, including mass density tensile strength, tensile strength, compressive strengths, deformation modulus, Poisson's ratio, cohesive force and internal friction angle as well as the infrared spectrum of absorption and fluorescence spectrum, are studied and measured in detail by different methods, involving the synthetic...
Successful performance of power grid needs to deal with the balancing of supply and demand in real time. In order to improve the quality of electric grid, a significant amount of power is necessary to be injected into the grid to solve the power system failures, such as voltage dip, reactive power rush and so on. These electric accidents can be well improved by energy storage systems (ESS), which...
This paper presents simulation and experimental studies of permanent magnet synchronous motor (PMSM) control methods, including vector control (VC) or field oriented control (FOC), direct torque control (DTC) and model predictive control (MPC). The static and dynamic performance of each method are performed and compared in Matlab/Simulink and dSAPCE system.
Permanent magnet linear synchronous motors (PMLSMs) have been widely used as the driving source to satisfy requirements such as the speeding up of transportation systems. PMLSM is expected for the higher thrust and higher speed, thus, the thrust force characteristic is one of investigative hot spots to PMLSM. This paper presents the electromagnetic thrust force characteristics in different conditions...
Measurement and control systems are important to operate an permanent magnet linear synchronous motor (PMLSM). This paper presents the development of a virtual instrument measurement and control platform for special applications in the fields of characteristic study of PMLSM. Using this platform, principal parameters of the motor can be tested and modified conveniently during the operation, and it...
This paper systematically reports our recent study on the magnetic hysteresis property of magnetorheological (MR) fluid material under one dimension alternating and two dimension rotating magnetic field. The measurement was completed by a single sheet tester and a MR fluid sample container. The principle of measurement and the calibrating procedure of sensor coil are presented. The experiment results,...
According to present situation and unsaved problems of home fireproof alarm system, the intelligent fireproof alarm system based on public telephone net is introduced. In the system, flammable gas sensor, temperature sensor and smoke sensor are used as the detection devices; the Single Chip Microprocessor (SCM) is used as the control core unit; and the intelligent alarm function is accomplished by...
Permanent magnet linear synchronous motors (PMLSMs) have important applications in transportation and industrial control systems for their direct thrust and high power density, etc. Normal force is the most important criteria for the PMLSM, this paper analyze the numerical model to evaluate normal force. Through calculating, simulation and measuring, the traits of normal thrust has been found out,...
The paper discusses the design of protection circuits responsible for the reliability of arc welding power supply. The protection circuits include three parts, and they are soft-start circuit for anti-surge, circuit for eliminating transformer DC bias magnetic field and circuit for transient over-voltage suppression, respectively. The detail calculations about component parameters of these circuits...
The increasing cost of fossil fuel and crisis of energy has led the world in a quest for exploiting the free and naturally available energy from the sun to produce electric power. This paper summarizes the development situation of the solar thermal electric technology with description and comparison for three prevalent power generation methods: parabolic trough, parabolic dish-engine, and solar power...
On the basis of the study in Network on Chip (NoC) topologies, routing algorithm, data exchange and virtual channel technology, we design an online detection method of interconnection for 2D torus structure of NoC system in this paper. This method can detect the data errors during transmission, and identify the error results from the routing switch failure or the data transmission interconnection...
From infrared spectra of absorption of pure and magnetized water we discover exceptionally that its infrared absorptions have an irreversible effect during the processes of increasing and decreasing temperature. Then we infer that water is not a fluid conforming to Newtonian laws. Hence we collected the rheology features of pure and magnetized water, and discover that their viscosities decreases with...
The flux-switching permanent-magnet machines (FSPMMs) are emerging structure stator-PM brushless machines, which offer the advantages of high reliability, high power/torque density, high efficiency and so on. In this paper, a new FSPMM with 12 / 14 poles (stator/rotor) is firstly proposed. For its nonlinear electromagnetic distribution, its electromagnetic traits are discussed and then analyzed by...
In this paper, the control strategy for a parallel-inverters-based microgrid is presented. The control strategy includes outer active and reactive power control loop based on frequency and voltage droop method to avoid critical communications among distributed generation units (DGs). The inner inverter control loop is employed to produce the required inverter output voltage provided by the outer power...
To prevent the performance degradation of proton exchange membrane fuel cell (PEMFC), this paper conducts research in intelligent comprehensive control of the operational parameters, such as the operating temperature, pressure, mass flows of hydrogen and air for the PEMFC stack, current density, the exhaust emission quantity of reactant gas, and humidity of the hydrogen and air/oxygen. An analysis...
We present a novel strategy to build a directed stock network by visualizing granger causality existing between node-pairs. Furthermore, we compare the structure characteristics and nodal centrality in this newly-created directed network with those of the correlation network and conclude that directed network reflects the other portray of stock market based on its heterogeneity. In addition, causality...
This paper investigates and measures the near end and far end crosstalk in the multiconductor transmission line (MTL) mounted on the PCB by varying the parameters which are associated with physical dimension, characteristic of the substrate and the nature of input signal. With the variation of these factors, the coupling inductance and capacitance vary causing crosstalk. By using the method of moment...
In the middle of last century, biology researchers found that weakly electric fish could sense weak electric field changes of the environment to navigate and prey, which is commonly known as active electric field location. In this paper, we built an experiment system for active electrolocation by simulating weakly electric fish. The effect on electrolocation of electrodes different in materials was...
With increasing interest and stricter regulation on air quality the perspectives of zero-emission sailing during port approach is explored. As a case study the feasibility of zero - emission port approach with normal or superconductive electric propulsion, battery systems on board and in tugs as well as the possibilities for shore power supply is explored. The emission savings are considerable and...
The objective of this work is to investigate the effect of Al2O3 nanoparticles on structural and superconducting properties of YBa2Cu3O7−x (YBCO) produced using pyrophoric reaction. A series of YBCO samples with small amounts (0 – 1.0 wt %) of nanosized Al2O3 (− 10 nm) were characterized with XRD, and SEM measurements. Critical current Jc and critical temperature Tc measurements were performed using...
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