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Aiming at the reduction of the effects of single event upsets (SEUs) which must be considered in Space applications of Field Programmable Gate Array (FPGA), a novel dependable dual module redundancy (DMR) system based on dynamic configurable FPGAs is presented in this paper. The system can not only detect faults but also recovery the circuits effectively. Using dynamic reconfigurable methodology,...
The introduction of the superconducting technology to the resonant circuits results in various advantages, e.g., very large resonant current, very low operation energy loss, very low input power demand, thus makes low-frequency contactless power transfer (CPT) available. A novel CPT scheme is proposed, with the transfer power, transfer efficiency and electromagnetic field discussed to identify this...
A new improved SMES chopper circuit is proposed for improving the energy storage and discharge efficiencies. The results obtained verify that the improved SMES circuit has longer energy storage time and lower control demand for the whole SMES system, and further results in longer energy discharge time with higher discharge efficiency.
The superconducting magnetic energy system (SMES) is introduced to form new hybrid energy storage systems (ESSs). The results obtained verify that the SMES-based hybrid ESSs suit to achieve ms-level fast power compensation and MW-level large power compensation in power system. The SMES-based hybrid ESSs can also reduce the total capital cost and improve the operation efficiency, which make the large-scale...
Bias error and linearity error influence the measurement precision of three axis fluxgate magnetometers. So, it is important to obtain and calibrate these errors. Bias error and linearity error of a German made DM-060 digital magnetometer are measured by precise electromagnetic devices. Firstly, bias of each axis is obtained by an alternating weak electromagnetic standard equipment. A method by comparing...
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...
The transition way of microstrip to coaxial line, coaxial line to waveguide and microstrip-coaxial line-waveguide of Ka band is analyzed in this paper, and a compensation structure of microstrip-coaxial line-waveguide transition is mentioned. This probe transition way was simulated by microwave CAD software and the result shows the compensation structure reduce the insertion loss effectively, thus...
A novel broadband quarter-wavelength SIR BPF using LTCC technology is proposed. In this filter, three different coupling schemes are adopted. Edge-coupled structure is used to realize week coupling coefficient while great coefficient is obtained by applying direct magnetic coupling between two resonators or overlapping resonators in different LTCC layers. Based on the proposed strong coupling topology,...
This paper presents a novel Delta Sigma Modulator (DSM) in form of MASH 2-1-2, which can suppress the spurious tones in spectrum for all constant inputs with error feedback as dither. As a finite-state machine (FSM), DSM always outputs a periodic sequence (or cycle) with a constant input. However, the novel DSM was designed to break up the periodic cycles and suppress quantization noise occurred in...
A new digital Automatic gain control (AGC) circuit with two-stage gain adjustment is proposed in this paper. This AGC circuit is designed as part of an intermediate frequency (IF) processing circuit in the spectrum analyzer. The first stage controls the gain in 20 dB Steps and improves the measurement range of the RMS detector, while the second stage controls the gain in 3 dB Steps and gets a precise...
The possibility of wireless networked sensor used to monitor and control robot wireless network by Internet was discussed in this paper, and a novel fault self-diagnosis method and model for wireless networked sensor used in robot network based on the fuzzy theory was developed. The structure of wireless networked sensor, fault self-diagnosis method and model are introduced in detail. The fuzzy reasoning...
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 magnetic flux leakage detection method is one of the important oil casing defects detection methods. It is significant to locate the position of the defects and evaluate the degree of the damages. Based on analyzing the magnetic path of the oil casing, a design of the magnetic core parameters that guarantees the detection results can be hardly affected by the environment is presented in this paper...
The advent of High Temperature Superconductor (HTS) materials has increased interest in research and development of superconducting transformers with major projects being carried out worldwide. Several benefits were accomplished with the introduction such as lower power loss, smaller size and lighter weight transformer. However, recent development on HTS transformer has focused on its ability to also...
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...
Recently the Bessel function approach to calculating the magnetic fields of coils has been used to calculate the mutual inductance and the force between two non coaxial thick cylindrical coils with parallel axes and uniform radial current distributions. This method can also be applied to calculate the force and inductance between an ordinary coil and a Bitter coil, or between two bitter coils, not...
Effect of SiC, as carbon source doping, by diffusion method on the lattice parameter, critical temperature (Tc) and critical current density (Jc) has been studied. The broadening of full width at half maximum (FWHM) values in XRD patterns with increasing of the doping level indicates smaller grains and imperfect MgB2 crystallinity, whereas the carbon substitution into the boron site was confirmed...
Fault section identification in distribution networks is a complicated and important subject. This paper presents a method to distinguish the faulted section with the aid of traveling waves. The proposed algorithm is able to detect the faulty section using voltage signals only and avoid the need for installing current transformers. Fault direction identification method proposed in this paper is based...
A co-precipitation technique has been used to synthesize nanoscale Yttrium Barium Copper Oxide (YBCO) superconducting oxide materials doped with amorphous carbon nanotubes (α-CNTs). Carbon nano-tubes were chosen as doping materials since their nanometer diameter can serve as the effective pinning centers compared to the ordinary carbon. The properties of materials were characterized by X-ray diffraction...
Some kinds of aquatic fishes developed an ability to generate a weak electric field actively and detect its change due to the presence or absence of objects in their surroundings. During its hunting, a rapid and precise strike must be initiated almost immediately upon detection—otherwise, the prey will rapidly pass out of the sensory volume. From the point of view of location mechanism, we investigated...
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