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Capacitive DC links provide the only low-impedance current path connected with an input source during the start-up of many voltage source converters. A soft-start circuit is usually implemented to limit the inrush current. A two-terminal active capacitor is recently proposed which can directly replace conventional passive capacitors in DC links, with reduced cost or size for a given application. The...
The movable contact of conventional air circuit breaker (ACB) includes multiple parallel contacts. The arc motion process directly affects the breaker capacity of ACB. Therefore, it is important to study the arc motion process of multiple parallel contacts model. A three-dimensional (3D) magneto-hydro-dynamic (MHD) model of air arc plasma is built to investigate the arc motion process. The anode of...
The erosion of contact material is one of the critical failure mechanisms in switch devices. Thus it is important to study the characteristics of contact erosion. In this paper, a two-dimensional magnetic hydrodynamics (MHD) is established to get physical characteristics of the molten pool in cathode. Gas dynamics and statistical methods are then used for the calculation of the vaporization rates...
This paper presents a developed multi-criteria optimization model aiming to obtain a cost-effective design for a meat supply chain network with respect to minimization of total implementation and operational cost, and maximization of customer satisfaction and product quality. Moreover, the aim of this work intends to solve the facility location-allocation problem along with the quantities of products...
Mineral oil is widely used in the transformers as insulation oil because of its preferable low price, good insulation quality and a relatively low condensation point. However, with the consideration of the fact that it almost does not degrade which can cause the contamination of soil, water and our living environment; While on the other hand that fossil fuel would be a scarce resource for the 21st...
Developments of sustainable manufacturing systems are considered as one of effective solutions to minimize the environmental impact. Design of a sustainable manufacturing system can be partially achieved through the implementation of lean methods to reduce manufacturing wastes and operational costs, and increase the system efficiency and productivity. However, the lean approach does not include environmental...
Future self-driving cars and current ones with advanced driver assistance systems are expected to interact with other traffic participants, which often are multiple other vehicles. To facilitate the motion planning of the autonomously controlled vehicle in collision avoidance, individual object vehicles with closeness in positions and velocities can be grouped as a single extended moving object. However,...
This paper introduces an inductor magnetic lead screw (IMLS) for simplify the structure of magnetic lead screw (MLS). The IMLS is formed on the basis of reluctance MLS with toroidal windings on both sides of the screw. The windings are assigned by dc current of reserved direction to produce magnetic flux through the air gap. The degree of freedom of the nut and screw is limited to avoid the brush...
In the signal phase AC traction power supply system, usually use automatic passing neutral section to maintain load balances of three-phase system, but the automatic passing neutral section is easy to produce overvoltage in power system, it severely imperils the safety of electric system and equipment. Therefore, it is necessity to carry on the analysis to the electromagnetic transient process of...
Cu is commonly used as filling material for TSV in 3D integration [1]. However, there is a problem of thermal mismatch between Cu and Si, and also there is still space for improvement in electrical resistivity. In order to improve the physical properties of TSV electroplating copper, we added high conductivity and low expansion coefficient nanoparticles such as graphene to the copper plating solution...
This paper attempts to represent the mapped data in the radial basis function (RBF) feature space under non-negativity constraints and develops a RBF kernel based non-negative matrix factorization (KNMF-RBF) algorithm. Based on an objective function with Frobenius norm, we obtain the multiplicative update rules of our KNMF-RBF approach using kernel theory and gradient descent method. The proposed...
We present a method for magnetic field measurement by the weak magnetic-sensitive Zeeman splitting and a method for measuring the magnetic field vector by probing the line strength of stimulated Raman transitions. Compared with the traditional measurement, the contrast of the weak magnetic-sensitive resonance signal is improved significantly for gradient field. We also present a dynamical compensation...
We propose an improvement for increasing the performance of locked periodic atomic frequency standards(AFS), based on correcting the noise of the asynchronism of phase-detecting and feedback process. Theoretical analysis and numerical simulation show that the method can optimize the stability AFS which is related with d. And is the duty of phase-discriminating of AFS. If in-loop noise possesses white...
The electric vehicle parameters collected by timesharing lease management platform have been accumulated increasingly, which has laid a firm foundation for large data analysis. Pretreatment technology plays an important role in the process of data acquisition. In particular, there is a risk of intervention in the process of transmitting monitoring data between two platforms. Therefore, this paper...
Simplified Maximum Likelihood (ML) detection and annular-sector (AS) detection for two dimensional constellations is shown to significantly outperform the conventional minimum Euclidean distance (MED) detector in presence of laser phase noise and frequency offset.
Speed control mode of a DC motor without knowing the specific parameters of the motor is discussed. The approximate mathematical model of the control system is obtained by the system identification when the output of the system is measured by loading the specific input signal. The PID control algorithm is adopted and the P, I, and D parameters are obtained by auto tuning. Hardware in the loop (HIL)...
The Internet of Things (IoT) network supports various network applications through billions of heterogeneous connected devices. Efficient processing of enormous amounts of IoT data collected and exchanged by these devices is a key problem. Another issue is addressing information-centric IoT application data aggregation. To achieve these goals, this paper utilizes the novel Information Centric Networking...
Space charge formation within oil and oil-impregnated pressboard can distort electric field distributions within converter transformers. Electric field distortion may lead to materials partially overstressed. Therefore, it is important to analyze influential factors on space charge behavior such as temperature, moisture, aging and electric field. Temperature gradient is existing across insulation...
In a surgery grading management system, surgeries are classified according to their operation difficulty and the complexity, surgeons' qualification is divided based on their experience and educational level, and a surgery of certain difficulty could only be done by a surgeon of certain qualification, therefore the operation risk cost could be reduced. When implementing surgery grading management...
A microassembly system based on electric field manipulation is described. Optical addressing of a photo-transistor array controls the position and orientation of micro-objects using dielectrophoretic and electrophoretic forces. Open-loop control is used to rapidly direct many micro-objects in parallel. Closed-loop control is used to position micro-objects precisely. Demonstrations with beads (10 μm...
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