An advanced detector based on the dual frequency IP method was designed to solve the speed unmatched problem between the detection and excavation.The detector consists of the transmission module and the receiving module.This paper designed the circuit of the transmission module with the Proteus software and completed the control program with the Keil software.Through the co-simulation of the circuit and the control program,the transmission waveforms designed were obtained and the system proved available,which laid the foundation for the development of the transmission module of the detector.

关键词：先进的检测；传输模块；变形杆菌；协同仿真设计；电子信息

查看摘要 索取原文[5页]

The phased array strapdown radar seeker's detecting information is coupled with missile attitude information.Hence,the measurement information can not be used for proportional navigation directly.The method of reconstructing inertial line of sight (LOS) rate in phased array strapdown seeker is presented using the missile-target relative motion geometric and filtering algorithm.Considering measurement noise and nonlinearity of the phased array strapdown radar guidance systems,the principle of unscented kalman filter (UKF) is introduced to estimate LOS rate.The simulation results show that the reconstruction method is correct and the extraction of LOS rate is effective.

关键词：相控阵捷联导引头；视线角速率重构； UKF；电子信息

查看摘要 索取原文[6页]

In this paper,we present a new approach to improve extracting accuracy of impervious surfaces.One Landsat TM image of Taiyuan city,Shanxi Province of China was used.After doing test work and analyzing using optimum bands analysis,principal component analysis,and normalized difference impervious surface index,we present the method,optimized band combination.Both unsupervised and supervised classification methods were used to classify the original image,principal component analysis image,normalized difference impervious surface index image,and optimized band combination images we present.The accuracies result of these classifications were assessed by using 256 randomly selected sampling points,and it was found that the overall accuracy the accuracy of optimized band combination method can be reach 87.72％,with the Kappa statistic of 0.85 in impervious surface extraction,it was better than other three methods can get.

关键词：不透水表面提取；遥感图像处理；电子信息

查看摘要 索取原文[5页]

Staff line removal is a key step before segmentation and recognition of music image and plays an important role in OMR (Optical Music Recognition) research,the result of staff line removal directly influences the performance and function of the whole OMR system.However,over-removal and under-removal often occurs in the processing and leads to the low efficiency of music recognition rate.So,in order to solve the arduous problem,an approach based on run-length graph slice and topological structure of music is put forward by careful analysis of staff line and music notation structure.Experience results show the validity and practicality of the presented algorithm fast and effectively.

关键词：OMR;游程图片；工作人员线移除；拓扑结构

查看摘要 索取原文[5页]

The Petri Net models that we analyse in the following consider the time as a quantifiable and continuous parameter whereas in an untimed Petri Net model the time is taken into account only via the partial order relation between the transitions that are executed in the plant. As presented in Chapter 16 there are two main time extensions of Petri Nets (PNs) namely Time Petri Nets [21] and Timed Petri Nets [22].

关键词：Petri网模型；连续参数；电网

查看摘要 索取原文[22页]

With different element models and parameters in power system,the transient stability analysis results are also different,especially the model of generator and load.Based on the actual parameters of Hunan power grid,this paper builds the synthesis load rnodel of the distribution network with small hydropower considered,and then the Hunan simulation network can also be got.Using PSASP,analyses the transient stability of Hunan power system with distributed small hydropower under different operation modes systematically and comprehensively.Through an overall check of the stability level in each Hunan area,and then compared with the analysis results of Hunan power grid based on the currently used load model,the influences of the distributed small hydropower on the safe and stable operation of the large power network are summarized.

关键词：分布式发电；暂态稳定;负荷建模; PSASP

查看摘要 索取原文[6页]

Common software synchronous sampling methods have some shortcomings such as sampling synchronization error,sampling interval error accumulation increment and so on,and the impact of this error on the measurement accuracy can not be ignored[1].In this paper,analysis on synchronization error occurrence reasons was performed,and proposed the synchronization implementation method of asynchronous sampling.This method can track the real-time changes of electrical signal by the zero-cross-over triggering circuit,and reduce the synchronization error by the software method.Simulation analysis of the signal cycle (frequency) and RMS measurement shows that proposed method improves accuracy of the electrical signal parameters measurement based on microprocessor technology.

关键词：软件同步采样；同步误差；零交叉触发电路；量化误差

查看摘要 索取原文[5页]

Based on increasing the acceleration of high-gravity field from 500 g to 2500 g,a series of TiC-TiB2 composites are prepared by combustion synthesis in high-gravity field,and microstructure modification,microstructure homogeneity and mechanical properties of TiC-TiB2 composites are discussed in terms of liquid-liquid separation of TiC-TiB2 and Al2O3 in high gravity field.XRD,FESEM and EDS results showed that by increasing the acceleration of high gravity field,Al2O3 inclusions in the ceramic decreased both in volume fraction and size due to the enhanced separation of TiC-TiB2 liquid and Al2O3 liquid,while the enhanced Stokes flow induced by the enhanced liquid-liquid separation also promoted the constitutional homogeneity of TiC-TiB2melt,thereby bringing about the refinement of the solidified microstructures,finally,making Vickers hardness and fracture toughness of the composites increase with the acceleration of high gravity field.

关键词：高重力场;液 - 液分离;组织改造;组织均匀性

查看摘要 索取原文[5页]

Failure and security risks of communication optical cable in electric power system caused by anomalous changing of strain have been investigated,the current situation of the strain monitoring system for optical cable of electric power system has been introduced,and the principle and features of measuring the strain by using fiber grating sensing technology have been presented.The new method that can be used in strain monitoring for communication optical cable of key position in electric power system has been put forward,and fiber grating sensor scheme has been designed.Finally,several key technical problems in its practical application have been analyzed in detail.

关键词：纤光栅；电力；光缆；应变

查看摘要 索取原文[6页]

The world's energy paradigm continues to undergo a rapid shift, fueled by legislative mandates and quotas, towards an increased use of renewable energy sources. To support this shift, an advanced electric power system (EPS) architecture, including increasing amounts of distributed resources, load control, bi-directional power flow, advanced metering, and improved communications is gaining attention and being implemented by many electric utilities. As new distributed energy resources are interconnected with the EPS, it is essential to verify not only that their grid interconnection systems (ICS) conform to the relevant U.S. grid interconnection standards (IEEE Std 1547 and UL 1741), but also that they perform satisfactorily under a variety of variable resource input and grid output conditions. To this end, the National Renewable Energy Laboratory (NREL) has been developing a platform for evaluation of ICSs using hardware-in-the-loop (HIL). This report describes an important addition to that platforma grid interconnection system evaluator (GISE). The GISE is a combined hardware and software solution that leverages HIL simulation techniques to automate portions of the often time-consuming grid interconnection conformance test procedures of IEEE Std 1547.1. Beyond just automating grid interconnection conformance test procedures for standard equipment, the GISE provides a platform to test the capability of an ICS with respect to advanced grid functions such as voltage and/or frequency ride-through, volt/var control, or other ancillary services. This report provides a comprehensive set of test results demonstrating the GISE's accuracy, repeatability, and versatility in executing IEEE Std 1547 over/undervoltage and frequency and unintentional islanding tests. This testing regime employed three different commercial residential photovoltaic inverters to also show the applicability of the GISE to a variety of ICS topologies. 

关键词：互联电力系统；电网；电力；电气事业

查看摘要 索取原文[46页]