为了积极实践全员育人、全程育人和全方位育人的要求，在电磁场与电磁波课程中引入思政教育。本文从电磁场与电磁波课程 内容中挖掘思政元素，建立思政内容资料库，根据授课内容、专业理论出现的历史背景和当前发展状况等，设置合适的思政教育目标，以某 个知识点或理论作为思政教育的切入点融入思政元素。课堂上，依据授课内容灵活加入思政教育内容，激发学生的情感体验。在课程考核中 增加思政内容，考核学生在专业知识学习的同时是否培养出正确的三观和职业道德。

针对目前创新创业人才培养中存在教育理念滞后、教育环境不健全、教师双创意识欠缺、培养课程体系不完善等问题,探讨大学生创新创业素养与能力培养所需教学条件,从双创平台、培养体系、指导团队、管理模式等方面着手,以能力导向理论为主要理论基础,遵循教育科学规律,构建"能力导向,项目驱动,三级培训,成果评价"的创新创业能力培养体系;有效整合校内外有效资源,构建多元开放创新创业人才培养平台;产教融合,科教兼顾,培育一支高水平指导团队;创新"学院统筹,主题引导,学生自主,社团参与"的多体协同开放平台管理模式,激发学生开展创新创业活动的自主性和积极性,培养适应经济社会发展的具有创新创业精神与能力的高素质人才.

A novel and high-performance four-element ultra-wideband (UWB) multiple-input multipleoutput (MIMO) antenna is proposed in the paper. The proposed antenna is designed by using a novel integration technology of the symmetric layout, orthogonal structure, four-directional staircase-shaped decoupling, and multi-slit and multi-slot techniques. The mutual couplings among the antenna elements are significantly reduced by introducing the symmetric orthogonal and separated four-directional staircaseshaped structure. Furthermore, the antenna size is effectively miniaturized, and its impedance bandwidth is broadened by using a two-sided symmetric layout, partial and defected ground structure, the decoupling structure, and multi-slot and multi-slit techniques. Therefore, the antenna has the low-profile structure and a small dimension of 39mm×39mm×1.6mm. Moreover, the proposed antenna achieves triple band-notched characteristics by embedding different type slots and slits on the square radiating elements, default ground structure, and the decoupling structure, respectively. As a result, the antenna obtains the wider bandwidth of 2.30-13.75 GHz with the notched bands of 3.25-3.75 GHz, 5.08-5.90 GHz, and 7.06-7.95 GHz. The three notched bands are good in agreement with the existing interference bands of WiMAX (3.3-3.7 GHz), WLAN (5.15-5.875 GHz), and X-band (7.1-7.9 GHz), respectively. In addition, the proposed antenna also has a lower mutual coupling (<;-22dB), lower envelop correlation coefficient (ECC<;0.02, except for the three notched bands), high multiplexing efficiency (ηmux >-3.0dB), stable gain, and quasi-omnidirectional radiation patterns at the entire impedance bandwidth. Therefore, a good tradeoff of the performance is obtained for the proposed antenna. The proposed antenna can be a good candidate for UWB-MIMO wireless communication applications, and especially for portable UWB-MIMO systems.

为提高"通信原理"课程教学效果,针对"通信原理"课程理论性较强、涉及内容抽象的特点,通过引入虚拟仿真实验辅助教学,利用Matlab软件中的Simulink模块搭建通信电子线路,更直观地演示了通信系统各模块功能,加强理论与实践的结合,帮助学生加深对基本原理的理解和基础理论的巩固.实践表明,引入Simulink仿真辅助教学,比利用传统实验箱对基本原理验证更为灵活,虚拟仿真更有利于开展创新性实验,培养学生的创新能力.

The problem of direction-of-arrival (DOA) estimation in partially calibrated arrays composed of multiple uniform linear arrays is studied. We assume that each subarray is calibrated well, so that the steering vectors of all subarrays are exactly known. However, the intersubarray calibration errors are unknown. The proposed method first obtains a set of initial DOA results by employing a rotational invariance property between two sets of received data, and then more accurate DOA estimation and self-calibration are performed by using the MUSIC-based method through a local searching algorithm. We also derive the corresponding stochastic Cramér-Rao bound to which we compare the performance of the proposed estimator.

A series of bifunctional NaYF 4 microcrystals doped with Yb 3+ /Er 3+ have been successfully synthesized through a facile hydrothermal method.They have been characterized by XRD, SEM, photoluminescence spectra and the magnetization.These microcrystals can emit ∼540 nm green light from Er 3+ -4 f n electronic transition 4 S 3/2 -4 I 15/2 , ∼657 nm red light from Er 3+ -4 f n electronic transition 4 F 9/2 -4 I 15/2 , and ∼407 nm violet light from Er 3+ -4 f n electronic transition 2 H 4 9/2 I 15/2 , under the excitation of 980 nm infrared light.It is found that the red emission is more sensitive to the doping of Yb 3+ ion than the green one, leading to the significant increase in the ratio of red emission to green emission with increasing concentration of Yb 3+ ion.In addition, the paramagnetic property was remarkably enhanced with increasing concentration of Yb 3+ ion which is ascribed to the substitution of nonmagnetic ion Y 3+ by the magnetic ion Yb 3+ with large magnetic moment.

Nonlinear equation is an important cornerstone of nonlinear science, and many practical problems in scientific and engineering fields can be described by nonlinear equation in mathematics. In this paper, improved zeroing neural network (IZNN) models are presented and investigated for finding the solutions of the time-invariant nonlinear equation (TINE) and time-varying nonlinear equation (TVNE) in predictable and finite time. Compared with the exponential convergence zeroing neural network (ZNN), the convergence time of the IZNN models is finite and able to be estimated; in addition, the IZNN model is more stable and reliable for solving high-order TVNE. Both of the theoretical and numerical simulation results of the ZNN and IZNN for finding the solutions of the TINE and TVNE are presented to demonstrate the superiority and effectiveness of the IZNN model.

A small and simple four‐port ultra‐wideband multiple input multiple output (UWB‐MIMO) antenna is designed in this letter. Each element of the designed antenna is composed of a circular patch, two smaller parasitic U‐shaped patches, a microstrip feed line, and a common square‐ring ground plane. To increase impedance bandwidth and reduce the size, this letter introduces the circular patch, two smaller parasitic U‐shaped patches, and the common square‐ring ground structure with multislits and the truncated corners. On the other hand, all the elements are identical and symmetrical, and neighboring elements are orthogonal to each other for improving the isolation. Furthermore, the double decoupling branches are added on diagonal position of the common square‐ring ground to further enhance the isolation and broaden the bandwidth. Therefore, the proposed UWB‐MIMO antenna is designed by using a novel and effective method of integrating the symmetric layout, orthogonal structure, four‐directional double branches decoupling, parasitic structure, truncated corners, and multislit techniques. Thus, the designed UWB‐MIMO antenna has the small physical size of 40 mm × 40 mm and obtains the ultra‐wider bandwidth of 3.0 to 18.0 GHz, higher isolation (>20 dB), smaller envelope correlation coefficient ( ρe < 0.03), and higher multiplex efficiency ( ηmux > −3.0 dB). Besides, the UWB‐MIMO antenna also achieves the acceptable peak realized gain, and stable radiating characteristics. Consequently, the designed antenna can be used for most UWB‐MIMO applications.

数字图像处理技术在计算机技术推动下得到了迅猛发展,成为了工农业生产及军事等相关应用领域中一项重要的技术手段.Matlab具有强大的矩阵数值计算能力,非常适合二维图像信号的处理仿真.本文从三个方面对matlab仿真对数字图像处理课程辅助教学进行研究,以期促进高校信息类专业数字图像处理课程教学改革发展.

In this paper, we propose and experimentally demonstrate a novel multi-access orthogonal frequency division multiplexing (OFDM) signal transmission system for free space optical communication and photon-assisted W-band millimeter-wave (mm-wave) communication. This new structure can combine the advantages of the free space optical communication and the W-band mm-wave wireless communication. Besides, the OFDM signal with high spectral efficiency and anti-interference capability can improve the data transmission rate and flexibility. Furthermore, it can adapt to the requirements of different communication scenarios. Utilizing the intra-symbol frequency-domain averaging (ISFA) technique and the discrete Fourier transform-spread (DFT-Spread) technique, 1Gbaud 16-ary quadrature amplitude modulation (16QAM) OFDM signal is transmitted successfully with the distance of 100 m for single-mode fiber (SMF), 100 m for FSO link and 4 m for wireless. The BER is under the soft-decision Forward Error Correction (SD-FEC) threshold of 2 x 10(-2). To our knowledge, this is the first time to realize the transmission of OFDM signal in the integration system of free space optical communication and photon-assisted W-band mm-wave communication.

在数字图像处理课程教学中,如何让学生对频率域有直观的认知及理解,是该课程教学过程中面临的一个难题.本文通过两个仿真实例,详细阐述了一维电信号及二维图像信号的频域问题,以加深学生对信号与系统、数字信号处理、数字信号处理等课程中频域知识点的理解.本文同时也对高校数字图像处理课程的教学进行了相关探讨.

在新工科背景下结合电气信息类大学生创新训练中心的实际,从建设总体思路、建设理念、创新指导团队、创新训练体系、指导教师激励机制和运行管理等多个方面着手,探索和实践了大学生创新训练中心的建设问题.实践成效证明,开展创新训练中心建设提高了学生的实践创新能力,对高校创新人才的培训和电气信息类学科的发展以及实践平台的建设具有良好的推动作用.

In order to solve the problem of analog circuit implementation of wavelet transform(WT), a novel method for implementing analog WT was presented using single switched-current (SI) integrator circuit. Firstly, according to the theory of WT implementation using analogue filters, the network function of a bandpass filter was selected as an example and proved that it was a mother wavelet function(WF) based on the admissible condition of the WF. Then the bandpass filter with its impulse response being the mother WF was designed using signal SI integrator. The different scale wavelet functions of the WT were obtained by adjusting the clock frequency of the wavelet filter. The results show that the designed circuits have many characteristics, such as high design precision without the WF approximation process, simple circuit structure and easily adjustment WF scales. Therefore, the proposed circuits are suitable for low voltage low power and real-time engineering applications.

通过对D-S证据理论冲突系数和组合规则进行研究,发现导致证据组合结果与事实相悖的另一个因素,为此,提出一种新的冲突系数表示方法和证据理论组合规则.新的方法针对证据冲突系数处理和组合规则不合理的情况,用自冲突系数和互冲突系数这2种方式的加权表示新的全局冲突系数.新的组合规则根据基本概率分配原则建立,并推导得出多点集焦元证据理论的组合情况.研究结果表明:本文所提方法与传统算法相比,规则更简便,更精确,在处理证据冲突和正常证据方面更具优势.

Bifunctional NaYF4 microcrystals doped with Yb3+/Er3+/La3+ have been successfully synthesized through a facile hydrothermal method, which have been characterized by XRD, SEM, photoluminescence spectra, and the photothermal effect measurement. Under the excitation of 980 nm infrared light, NaYF4: Yb3+/Er3+/La3+ microcrystals can emit green light of 520 nm and 540 nm, red light of 655 nm and violet light of 407 nm. It is observed that the photothermal efficiencies of NaYF4: Yb3+/Er3+ without La3+ ion doping are much lower than the one doped with La3+ ion. With increasing the concentration of the doped La3+ ions, the photothermal efficiencies of NaYF4: Yb3+/Er3+ are monotonously enhanced. Importantly, the time-resolved temperature curves indicated that the temperature rising rate of NaYF4: Yb3+/Er3+ microcrystals is remarkably enhanced by doping La3+ ion. The enhanced temperature rising rate with increasing the content of La3+ doping ion is beneficial to the photothermal effect applications, such as photothermal therapy since the therapy can be completed in the shorter time.

随着城市的发展和不断扩大,城市日常用水问题成了影响城市发展的一个重要因素,合理地对水资源进行利用是解决当前城市日常用水问题的关键所在.城市水资源的合理利用离不开水资源的科学管理和高效率的用水调度.文章根据城市日用水量预测数据融合理论进行研究,从而实现提高水资源调度过程的功效性,并对水资源数据融合中应用时间序列模型、支持向量机模型和证据理论模型进行综述研究.

A novel miniaturization planar ultra-wideband antenna with triple-notched bands is proposed. The antenna mainly consists of an elliptical patch, a rectangular split-ring patch with a -shaped slit and a T-shaped slit, and two small additional patches. Two different type slits are adopted to realize multiple-notched bands and reduce the antenna size. The designed antenna has a small dimension of 17x16x1.6mm(3). The simulated and measured results show the antenna has a very wide impedance bandwidth of 2.96-19.0GHz with Return Loss less than -10dB, except triple notched bands of 3.30-3.72, 5.13-5.82 and 7.04-7.92GHz, respectively, covering the WiMAX, WLAN and X-band systems. Furthermore, surface current distributions, gain, efficiency, radiation patterns and group delay characteristics of the antenna are also discussed. The results show that the antenna has high radiation efficiency, stable radiation pattern and lower group delay time.

The impact of outdated Channel State Information (CSI)on the performance of fixed-gain Amplify-and-forward (AF)cooperative communication systems considering the partial relay selection schemes is studied.The closed-form expressions for the distribution of received Signal-to-Noise Ratio (SNR)in a relay-selection-assisted cooperative communications system are first derived,in which in-dependent and identically distributed (i.i.d.)Rayleigh fading channels are assumed in each wireless link.After that,the theoretical closed-form expressions for outage probability,symbol error ratio, and average channel capacity are derived.Numerical analysis shows that the performance of fix-gain AF relay-selection scheme can be substantially influenced by parameters such as the number of relays,the channel correlation coefficient,and the end-to-end SNR.Furthermore,compared with the tradi-tional opportunistic-selection scheme,the feedback burden of the proposed scheme will be reduced by 50%,which provides an excellent compromise between complexity and performances of the system.

空间光调制技术是利用各种手段对光波在空间上的传输状态进行加工处理和控制的一项技术,被广泛应用于光通信、光学印刷,以及神经网络计算等领域.文章对激光信号的空间光调制技术目前的国内外研究现状进行了详细的分析,对空间光调制技术目前存在的技术挑战进行了详细阐述,并展望了今后该技术的发展方向.

在光纤通信课程教学中,如何让学生对用于光纤通信的光源的特征有直观的认知,是该课程教学过程中首先面临的难题.本文以光纤通信中光源特征为例,详细的阐述了虚拟辅助教学对加深学生对光纤通信课程知识点理解的作用.采用Mathematica软件对高斯光束信号进行仿真,输出它们的一维、二维、三维空间强度轮廓图,详细展示此种光信号的光源特征;并对利用Mathematica仿真可能出现的几点常见问题进行了详细阐述.