Advanced Materials Research Vols. 753-755

Abstract: Designed thermal collector conversion device based on the principle of thermoelectric power generation. This device used the LTC3108 module which was low input voltage boost converter. The device can convert the heat from the screw pump working into electricity. The electricity can be powered microprocessors and sensors.

Abstract: With the expansion of the grid scale, the level of short-circuit current is significantly increased, we propose more stringent requirements to the grid. Limiting the short-circuit current is a problem to be solved.This paper used PSS/E to build the electromechanical transient simulation models of the SCCL device. We tested and checked the models by the system of IEEE 9 nodes 3 machines and concluded: In the current limiter parameters, the larger the inductor is,the better the effect of limiting current is. In the same resistance situation,the larger the inductance is, the better the effect of limiting current is, the smaller the short-circuit current value is.

Abstract: Balanced realization is an attractive candidate to design state-space adaptive filter structure due to its least parameter sensitivity. In this paper, based on the balanced realization, an adaptive finite impulse response (FIR) filtering algorithm is proposed to minimize the output-error using the coefficients of the transfer function as the adaptive filter parameters. This algorithm is an internally balanced realization form and guarantees that the designed adaptive FIR filtering always minimizes the ratio of maximum-to-minimum eigenvalues of the Grammian matrices.

Abstract: In the detection substation microcomputer AC sampling system , monitor the three-phase voltagethree-phase current , power factor ,power online in real-time. This paper describes a FFT designing idea of the synchronous sampling in AC sampling from the substation monitoring system parameters .It provided sampling and calculation methods to apply DSP, MCU measurement of AC signal , details of the mathematical model of AC electrical parameters digital sampling, the introduction of schematic diagram of hardware processing sampling signal of FFT, comparison of the realization of the software and MATLAB simulation, thus obtained the correctness of this algorithm.

Abstract: Ultra-precision machining is used for many engineering applications where the traditional processes fail to work. Focused ion beam (FIB) technology is a very important part of the ultra-precision machining. It can realize the precise positioning, microscopic observation and micro machining. This paper introduces the FIB system and its application. FIB system contains ion source, focusing and scanning equipment and sample station. FIB technique has many unique and important functions. It is widely used in semiconductor device fabrication and circuit failure analysis. It can realize sample etching, imaging, thin film deposited, ion implantation and micromachining.

Abstract: The accuracy of filtering deteriorates in condition that a priori information used in unscented Kalman filter (UKF) does not accord with the actual conditions. To improve the accuracy of filtering when the noise statistical properties are not known exactly in navigational data fusion, an adaptive UKF is proposed. In the filtering process, the statistical parameters of unknown system noises are adjusted online if filtering abnormality exists. Simulation results show that the proposed algorithm increases the accuracy compared with the standard UKF algorithm for integrated navigation.

Abstract: In this paper, we designed an umbrella-shaped antenna for receiving low rate satellite data. The umbrella is suit for receiving satellite data in motor and emergency weather safeguard, with small volume, portable and easy to setting and debugging.

Abstract: According to the needs of the factory testing of PV installations, an adjustable resistive test load is builded. The load is controlled by the PLC system, a resistive load of 16 groups constitute the main circuit, combined with signal detection and acquisition, display and protection features such as aspects of composition. The prototype experiments show that the test load according to the volume of the output voltage of the PV installations automatically adjust the size of the load, to achieve effective accordance between load requirement power and output power of the PV installations , the performance indicators meet the test requirements.

Abstract: The traditional channel estimation method in the communication system is based on the multipath channel intensive assume, lead to the spectrum utilization is low, compressed sensing theory provides a new way to solve this problem. The basic theory of compressed sensing is introduced, the feasibility of compressed sensing applied to channel estimation is explored, a detailed analysis several reconstruction algorithm of the compressed sensing channel estimation technologies: MP algorithm, OMP algorithm, CoSaMP. Studies have shown that fewer pilot signal channel estimation method based on compressed sensing theory to achieve the estimated performance comparable to traditional methods, thus improving spectrum efficiency.

Abstract: This artical designed and produced a half-bridge series resonant induction heating cooker induction cooker whose power is15kHz . The main controller of the cooker is S3F9454, and SG3525 is for adjusting the frequency, the principle of induction heating is the basis of its , by the load current feedback loop and PI we can get the adjustment of the frequency and power of the system. The practical use shows that the output power of the system is stable, and it has the advantages of high thermal efficiency and fast heating.