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Highly efficient electrocatalysts composed of earth‐abundant elements are desired for water‐splitting to produce clean and renewable chemical fuel. Herein, a heteroatomic‐doped multi‐phase Mo‐doped nickel phosphide/nickel sulfide (Mo‐NiPx/NiSy) nanowire electrocatalyst is designed by a successive phosphorization and sulfuration method for boosting overall water splitting (both oxygen and hydrogen...
The designing process of a ZigBee-Communication PCB (Printed Circuit Board) is presented. The layer-stack structure and through-hole structure for PCB via hole and pad are modelled firstly in HFSS simulation environment, and then the key designing parameters which affect the RF performance are identified and determined by simulation. The simulation result shows the PCB achieves 𢀒20dB return loss...
This paper presents a method to calculate phased array antenna diffraction field which based on superposition principle and UTD. By calculating the diffraction field of each array element, the total diffracted field of the phased array antenna can be obtained. The method of this paper tries to avoid a full-wave split, so it can be quick and effective.
It often brings electromagnetic compatibility problems when dense and complex cables lay in modern ship cabin. This paper tries to analyze the electromagnetic interference between power cable and shielded twisted-pair bundle with the transmission line theory and shielding theory. We take an experiment in the shielded room on the electromagnetic interference between the power cable and shielded twisted-pair...
A surface current automatic measurement technology has been introduced, and based on the automatic measurement software we realized the automatic measurement of the direction and the magnitude for the surface current. A VC== program is used to show the surface current distribution that is more convenient to research the characteristic of the surface current. And this is also used in the area of ground...
The fast solving method of radiation field density of the phased array antenna based on the pattern multification is constructed. The pattern multification is extended to the solving of field density of array antenna. The power coefficient is introduced to transplate the pattern to the field density. And the producing mechanism of the power coefficient are analysed.
The common ground impedance interference is an electromagnetic compatibility problem for the centralized layout of electronic equipment to consider. This paper processes from transfer impedance and transfer admittance of the mesh shield cable, and builds up the coupling model of signal transmission cable common ground impedance. The coupling of cable common ground impedance interference to the cable...
The ray trace method for solving reflection field based on the binary trees is presented. And the program realization is presented as well. The results prove that the new method is high efficient.
The novel design method of match network of printed antenna is presented. The microstrip single-stub match and 1/4 wavelength lines are used in the match network design. The results of the simulation and the experiment validate the design method.
This paper presents a novel radiation near-field computational model of phased array antenna based on mutual impedance. The steps are included: antenna element port current evaluation based on mutual impedance of array antenna element, resolving of radiation lobe of element, superimposition of fields. The novel method is fast and practical.
A three-dimensional model for Francis turbine's whole flow passage is established in this paper. Simulated calculations of fixed guide vanes, guide vanes, runner and internal flow field of a draft tube are conducted. Velocity vector distribution and static pressure distribution of volute, guide vanes, runner and in the draft tube of the Francis turbine under three operating conditions (design operating...
This paper investigates the pulsed fields waveform dependent characteristics of NEMP simulation. The termination impedance, the absorbing impedance of NEMP (nuclear electromagnetic pulse) simulator and the structures of simulator's influence on waveform of test region of NEMP simulator have investigate intensively. The conclusions of this paper can provide guidance to the design of NEMP simulator.
Based on the structure and characteristics of the frequency-scan antenna, the near-field computational model is constructed. The array element's phases are presented firstly and the radiation power of each array element is speculated according to the antenna aperture distribution. On the basis of the phase and power, the equation of radiation fields of each array element is obtained. According to...
Based on the characteristics of cosite coupling interference between transmitting and receiving antennas in a same battleship, a novel approach using the normalized least mean square (NLMS) algorithm to suppress the interference is proposed. Firstly, this paper analyses the principle of adaptive interference cancellation (AIC), then a simulation example is offered to show the implementing effect of...
Cosite coupling interference between transmitting and receiving antennas is one of the main electromagnetic interferences in modern warships, and it seriously affects the warship's EMC and battling performance. This paper analyses the principle of interference suppression using adaptive interference cancellation (AIC) technique, and describes an implementing scheme. At last, an experiment programme...
Shielding effectiveness (SE) and coupling characteristic of metallic enclosures with apertures excited by EMP are investigated. The coupling results of different configurations and number of apertures are discussed. The coupled electric field strength is the highest in the small area adjacent to the aperture. The electric field evolvement exhibit resonant behaviour evidently and the resonant peak...
Based on the characteristics of cosite coupling interference between transmitting and receiving antennas in a same battleship, this paper analyses the principle of interference suppression using adaptive interference cancellation (AIC) method, and describes an implementing scheme. At last, an experiment programme and some results are provided to demonstrate the effectiveness of the AIC system. Experiment...
Based on the structure and characteristics of the frequency-scan antenna, the near-field computational model is constructed. The array elementpsilas phases are presented firstly and the radiation power of each array element is speculated according to the antenna aperture distribution. On the basis of the phase and power, the equation of radiation fields of each array element is obtained. According...
Choosing 8031 minimal systems, a familiar MCS-51 series SCM (single chip microcontroller), as experimental object, this-paper studies irradiation field effects & effecting mechanism of ESD EMP (electrostatic discharge electromagnetic pulse) via effecting experiment and theory research respectively. The interference & damage threshold of SCM in different, failure modes are ascertained. By analyzing...
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