A low-profile single-layer half-mode substrate integrated waveguide (HMSIW) filtering antenna with compact circuit size is presented in this brief. The antenna features simple structure and consists of a half-mode substrate integrated waveguide cavity (HMSIWC), a shorted parasitic patch, and a folded defected ground structure (DGS) etched into the metallized ground plane. The half-mode technology is employed to reduce the overall dimension in the design. The shorted parasitic patch and the HMSIWC, both operating at half-mode states, are coupled with each other to form a second-order filtering response. And also a radiation null at higher stopband is introduced owing to the effects of the cross coupling. Furtherly, by etching a folded DGS into the metallized ground plane, an additional resonance in the passband and a controllable radiation null at lower stopband are simultaneously generated to broaden the impedance bandwidth and improve the selectivity of lower stopband respectively. For verification, a prototype of the developed HMSIW filtering antenna is designed, fabricated, and measured. The measured and simulated results are in good agreement, showing a wide impedance bandwidth of 9.2% at center frequency of 2.84 GHz, a flat in-band gain response with two controllable radiation nulls at both edges of the operating band, and a maximum boresight realized gain of 5.75 dBi. The proposed HMSIW filtering antenna demonstrates good in-band and out-of-band performance even with a very low profile of $0.015~\mathbf {\mathrm {\lambda }} _{0}$ .

针对厢式压滤机内盐泥浆固液分离过程难以直接观测的问题,使用Fluent软件对滤室内盐泥-卤水两相流进行数值模拟,在过滤压力为0.6 MPa时分析了滤室内部流场、压力场和浓度场的分布规律;通过仿真与实验相结合的方法,分析了不同过滤压力对过滤过程的影响.结果表明:盐泥流速沿中心进料通道逐渐减小,各滤室内流速由入料口向上下两端逐渐减小;盐泥从滤室上下两端向中心入料通道逐渐沉积成饼;过滤压力为0.6 MPa时过滤效率高且能耗低.

The compact, low-profile linearly polarized (LP) and circularly polarized (CP) filtering antennas based on a novel feed scheme are presented. The LP design consists of a patch and an inverted-h-shaped coupling feed probe, which can introduce two radiation nulls at the lower and the upper band edges to realize a quasi-elliptic bandpass filtering response, respectively. This LP design with simple feed structure is also extended to realize the CP function by adding an extra T -shaped feedline operating as a dual-mode resonator, while maintaining the excellent filtering performance and further enhancing the impedance bandwidth. For demonstration, two prototypes of the LP and CP designs were measured. The measured results agree well with the simulated values. In addition, good performance characteristics, i.e., flat passband gain response, excellent roll-off rate, and high out-of-band suppression level, could be well achieved.

对矿井采卤制盐工艺产生的盐泥使用卧螺离心机进行固液分离,应用计算流体力学软件Fluent,基于多相流Eulerian模型、RNG k-ε湍流模型及多重参考系(MRF)方法,对卧螺离心机流体域进行三维数值模拟,采用仿真与实验相结合的方式,研究了转鼓转速与分离特性的关系,结果表明:卧螺离心机在考虑螺旋叶片情况下比忽略螺旋叶片时切向速度滞后系数有明显提升;提出修正离心液压的概念,通过该理论数值证明分离液静压值与理论值的误差源于切向速度的滞后;当转鼓转速达3000r/min以上继续提高时,沉渣固相质量分数不会随之继续增大;分离液中固相微粒的沉降速度随转速增大会小幅均匀增大;实验表明卧螺离心机用于高浓度卤水高速离心时,将在径向产生一定程度的NaCl浓度梯度,溶质浓度在分离液外层较高,内层较低.

A novel Taylor positioning scheme for underground coal mine is presented to improve the positioning accuracy. Considering the Taylor algorithm depends on the initial value highly, the algorithm uses weight and threshold to choose the initial value by excluding coordinates which are of great error and then calculate the rest of coordinates based on weight. UWB wireless positioning system is designed to achieve this algorithm, the results show that the positioning accuracy achieves 0.4 m, which demonstrates it is suitable for coal mine environment.

Image segmentation is a key step in linking up of image processing and image analysis and a big problem in computer vision. Morphological reconstruction is an important method of image edge segmentation. Watershed transformation is a widely used image segmentation tool base on morphological reconstruction. The traditional watershed transformation method was poor in divide objects in different size because single threshold value can't eliminate noises in large object on top and enhance the edges of small object simultaneously. This paper proposed an improved image segmentation method based on morphological reconstruction. Using erosion operation, dilation operation, catchment basins for all size of objects were morphologically marked and re-shaped, which ensure watershed transformation in the final step segmentation the image accurately. The Experiment results showed the proposed method is more accurate in segmentation of complex images than traditional methods.

针对复杂工况时纯电动汽车磷酸铁锂(LiFePO4)电池内部化学反应复杂、纯电路机理模型难以准确地进行荷电状态(SOC)估计的问题,使用动力学电池模型(KiBaM)和二阶RC等效电路模型相结合的混合模型,充分考虑到电池放电过程中存在恢复效应和电流倍率效应,最终使一个模型能同时捕捉到动态的非线性容量效应和电路参数特征,从而获得更加准确的SOC估计和电池运行时间预测,并通过试验进一步证明了其准确性较高.

Recent research has emphasized the successful application of canonical correlation analysis (CCA) to perform fault detection (FD) in both static and dynamic processes with additive faults. However, dealing with multiplicative faults has not been as successful. Thus, this paper considers the application of CCA to deal with the detection of incipient multiplicative faults in industrial processes. The new approaches incorporate the CCA-based FD with the statistical local approach. It is shown that the methods are effective in detecting incipient multiplicative faults. Experiments using a continuous stirred tank heater and simulations on the Tennessee Eastman process are provided to validate the proposed methods. (C) 2016 Elsevier Ltd. All rights reserved.

针对小容量锂电池管理系统不能满足储能市场需求的问题,提出使用并联改进多个电池包的连接方式,提高锂电池管理系统容量,设计了基于并联方式的分布式模块化锂电池管理系统.基于上述结构框架,在每个电池包的主回路串入MOS管,根据每个电池包的SOC来动态分配每个MOS管的导通时间,继而控制每个电池包的充放电,解决了并联电池包之间的环流问题.通过Saber电路仿真软件对等效模型进行仿真,验证了该方案的可行性.

In order to solve the problem that the performance of wireless music router is unstable,we studied and designed a mips architecture-based lightweight wireless music router.Based on DLNA standard,we used the Platinum framework to design and implement the lightweight module for interactive discovery of DLNA control point and device,and designed a state machine management mechanism with priority to manage the order sequence of interactive control module so as to avoid the problem of unordered control signals caused by frequent music controls.We designed a high fidelity and lossless audio player,it realises the automatic download of audio files to local by DLNA devices.Moreover we used the ALSA-based advanced Linux sound architecture to achieve high fidelity music decoding and thus ensured the high quality music output to audio equipment.We used the software Chariot and Iperf in real tests of music router and mobile phone,test results of throughput and user datagram protocol showed that the wireless transmission performance of control signal was efficient and stable, test result of sound quality also showed that it was able to obtain high quality audio signal.

在智能家居网络设备自动发现过程中,网络设备端随机独立地选择延时发送服务响应消息,通常出现严重的消息拥塞现象.为解决智能家居网络中服务响应消息拥塞问题,以智能家居标准协议——通用即插即用(UPnP)进行自动发现设备为例,考虑不同应用场景中对服务发现过程的可靠性和实时性有不同要求,提出一种基于UPnP服务发现的随机服务系统模型.设计了集成系统响应指标和等待指标的通信损益函数,推导得到了最佳缓存队列长度与损益系数之间的关系.通过对比不同缓存队列长度中响应消息的到达时间、离开时间、等待时间和停留时间,验证了设计损益指标的必要性和随机服务系统模型的可行性.

In this paper, canonical correlation analysis (CCA)-based fault detection methods are proposed for both static and dynamic processes. Different from the well-established process monitoring and fault diagnosis systems based on multivariate analysis techniques like principal component analysis and partial least squares, the core of the proposed methods is to build residual signals by means of the CCA technique for the fault detection purpose. The proposed methods are applied to an alumina evaporation process, and the achieved results show that both methods are applicable for fault detection, while the dynamic one delivers better detection performance.

A ZnO multi-layer perforated with six layers of periodic orthohexagonal holes has been fabricated using a CAD/CAM micro-stereolithography method. Each layer of the fabricated ZnO material was aligned by regularly arranged hexagon holes, however layers with different hole sizes and periodicities were stochastically stacked together to finally form a disordered multi-layer. Propagation properties of electromagnetic waves in this composite structure were investigated by terahertz-wavelength transmission spectrum tests combining computer theoretical simulations. Numerical calculations using finite-difference time-domain method (FDTD) have shown that the transmission dips of those ordered ZnO single layers are determined only by two parameters denoted by D-1 and D-2 respectively (hexagonal hole size of D-1 and their periodicity of D-2). After stochastically assembling these ordered layers to form a disordered multi-layer, a wider gap (between 250-1000 mu m) was achieved compared with original un-stacked single-layers. Measurements of the transmission spectra of as-synthesized ZnO samples finally confirm the calculated results and suggest an enhancement of the wave dispersion via adding some types of disorders to photonic crystals. The results also help to clarify the transmission behaviors of the terahertz-wave propagating in these partially disordered honeycomb structures.

Aiming at the serious chattering problem to sliding mode control,a sliding mode control method with disturbance observer was presented to control currents of inner ring of three-phase voltage source PWM converter. First,the PWM converter mathematical model with disturbances under two-phase synchronous rotating coordinate system was deduced with consider of the modeling error and the coupling relationship between the two phase currents,and a whole second order decoupling system model was obtained with uncertainty. Second,a sliding mode controller was designed with ratio constant switching,and a disturbance observer was proposed based on error tracking to observe the uncertainties of the model. Then,Lyapunov function was constructed to get design conditions parameters of the controller and observer. At last,the results of simulation tests,in which four different kinds of uncertain factors were considered,show that the proposed method has obvious advantages in terms of control precision,robustness and stability,with the comparison of PI control and single sliding mode control.

Canonical correlation analysis(CCA) could be utilized for analyzing a linear static process when the input-output relationship is explicitly existing. Based on the canonical variates obtained by the CCA method, a novel fault detection approach can be designed by resembling the principal component analysis (PCA) and the partial least squares (PLS) approaches. However, in this paper, the traditional CCA approach will be shown insensitive to one kind of fault, i.e., multiplicative fault (change). Based on this motivation, a modified statistic based on the local approach is introduced to help CCA approach further improve its acceptance for detecting multiplicative changes in the static processes. The new method will be verified through its application to a continuous stirred tank heater (CSTH).

TLD algorithm is a long-term tracking algorithm for single target.And it has drawn wide attention recently.It can recognize target even the target that has been lost.However,its real-time performance is not good because of a large number of scanning boxes.We proposed a method which can generate scanning boxes dynamically.This method can reduce the calculation time efficiently and thus make TLD suit real-time situation.Experiment were conducted to compare the performance of the improved algorithm,original algorithm,Camshift and CT(Compress Tracking)algorithms.The experiment results show that when they are applied to real-time camera,the improved algorithm has faster tracking speed and higher accuracy.When they are applied on picture sequences,the speed and accuracy of the improved algorithm are better than other algorithms.

This paper proposed an active insulation detection method into which low-frequency AC signal was injected. And the method was partitioned into two detection stages:fault detection and insulation resistance calculation.In the fault detection stage,by measuring the “measurement resistance”voltage and then calculating the positive-negative parallel resist-ance value,the insulation resistance fault status of the insulation resistance can be determined.In the insulation resistance calculation stage,by disconnecting the load circuit and the AC signal source and then respectively connecting two resistors in parallel with positive and negative insulation resistance,two resistors terminal voltage can be measured and the positive and negative insulation resistance values can be calculated.Simulation results show that the failure rate of false positives is less than 2.1 5% of fault detection,and it can basically achieve a function of real-time detection in the insulation resistance detec-tion by injecting the low-frequency AC signal.

设计了一款以单片机C8051F020为主控芯片,采用端口扩展技术和Zigbee无线组网技术的开关电源老化监控系统.通过8组16选1的芯片用来分别实现128路电压和温度的采集以及继电器的关断控制,能够实现较低代价的大规模扩展;通过Zigbee模块将上位机、主控板和通信子板联系起来,并以Modbus协议为格式来传输数据和命令,并通过上位机软件实现数据显示和老化命令设置.现场调试表明:系统可检测到0～50 V的电压和0～125℃的温度,检测精度分别为0.01 V和0.1℃,且功耗低、效率高、成本低,可以满足工业生产的要求.

针对氧化铝蒸发系统结构复杂、物理模型难以搭建、大量数据得不到合理利用的问题,提出了基于主成分分析(PCA)的故障检测方法和直观的故障分离方法.通过对氧化铝蒸发系统进行深入分析,对系统故障进行分类,并在仿真模型中建立了不同的故障类型模型.最后,基于对氧化铝蒸发故障进行模拟得到的故障数据,给出了在氧化铝蒸发过程故障检测中的实例,验证了PCA方法的可行性.

研究氧化铝蒸发过程故障检测问题.氧化铝蒸发过程是一个非线性,时变的过程,结构错综复杂,样本数据少和难以建立精确模型进行实时检测问题.为此,提出了一种采用贝叶斯网络的小数据集蒸发过程故障检测方法.首先,在贝叶斯理论基础上,提出了一种结合领域知识的贪婪结构学习算法,由领域知识引导加边、减边和转边算子搜索,加速找到评分最高的网络结构.然后,小数据集通过Bootstrap抽样法获得大样本数据,经由改进的结构学习算法得到贝叶斯故障检测网络,检测网络包含变量的拓扑结构图及其条件概率表.用已知数据对检测网络进行验证,结果表明上述网络是有效的,同时亦能锁定故障所在位置,为蒸发过程实时优化控制开拓了一种新思路.