在专业英语教学中利用POGIL模式构建新型英语教学.该模式融合讲授、提问、讨论等多种教学方法,目标旨在突出学生综合应用能力的培养.采取多元化分段式考核方式,结合课堂检测,综合评价学生学习效果.实践表明该模式可以提高学生学习积极性,评价结果更为准确.

新冠疫情爆发后,全国高校开展了大规模的线上教学活动,保障了基本的教学进度,但是线上教学师生之间不能随时进行"面对面交流",既不利于学生掌握知识点,也不利于教师监控学生的学习状态.通过分析"信号与系统"课程特点以及网络学习条件,制定了详细的教学方案,探索新的教学模式,构建有效的师生信息互馈系统,激发学生的学习兴趣,取得了良好的教学效果.

We describe comparatively cryogenically cooled Tm, Ho: GdVO4 lasers with an emission wavelength of 2.05 μm under continuous wave and pulse operating mode. By varying the transmittance of output couplers to be 0.40 for a continuous wave laser, the maximum output power of 7.4 W was generated with a slope efficiency of 43.3% when the absorbed pump power was increased to 18.7 W. For passively Q-switched lasers, the output characteristics were researched through altering pump mode radius. When the pump mode radius focused into the Tm, Ho: GdVO4 center equaled near 600 μm, the peak power was increased to be the maximum value of 9.9 kW at the absorbed pump power of 11.8 W. The pulse energy of 0.39 mJ was achieved at the same absorbed pump power with repetition of 5.7 kHz.

With the development of deep learning and image technology, the deep convolutional neural network has been widely used to deal with image problems. In this paper, the pretrained vgg-19 convolutional network model is adopted to extract and define the loss function according to the image characteristics, and preset model parameters. The model training is completed through reverse propagation gradient descent and optimization iteration, finally, the artistic painting style conversion of photos is realized. At the same time, by adjusting the size of style weight and content weight, the output image is more inclined to the style picture, or more inclined to the content picture. Finally, the objective evaluation of the output image is has been completed by comparing the image style conversion results of the TensorFlow and the PyTorch. The results show that under the same iteration times, the PyTorch framework has relatively small computation, fast processing speed, and better image color retention effect, in contrast the TensorFlow frame retains more features of style images.

本文针对应用型专业人才培养的目标,从课程实验、各种竞赛、课程设计、专业实训、实习和毕业设计等方面,探讨了本校电子信息科学与技术专业的多维实践教学体系的建立.

In order to eliminate downlink interference and improve system performance, we proposed a method to eliminate inter-distract downlink interference based on the non-overlapping nature of the signal in autocorrelation domain. In this method, multi-antenna technology was used and spectrum resource was not additionally occupied, without requiring channel conditions. The simulation result showed that this method is suitable for the removal of strong downlink interference in the mobile station at the edge of the distract.

为培养高素质实用型专业人才,本文对电子信息科学与技术专业的实践教学体系多维递进模式进行了研究.从实习实训、课程实验、课程设计与毕业设计、社会实践及各类学科竞赛等多个维度出发,把基础知识和专业技术知识与实践教学有机融合在一起,最终达到提升学生的工程意识、创新意识、工程实践能力、社会实践能力的目标.

This paper reported a double layer cantilever harvester powered for vibration energy. A space layer between the PZT beam and the support silicon beam is existed, leading to the double layer cantilever structure. Such structure can allow the more strain generated by the piezoelectric layer due to the existing of space layer, and the output voltage is further increased. The formula of output voltage is then derived from the piezoelectric effect equation and vibration model. And the formula verifies the relationship of voltage and structure parameter. And the simulation in micrometer lever is used to discuss the relationship. Finally, the prototype is assembled and measured to verify the feature of the device. Experimentally, the 3.8V output voltage and 16.9uW output power is acquired.

With the increase of applied current density in low voltage cathodoluminescence, the exciting power tends to saturate, causing the saturation of electron-hole generation rate in the phosphor layer. Moreover, ground-state depletion could emerge for the activators owing to the increased exciting power and decreased average penetration depth of incident electrons in the phosphor layer, causing the decrease of the energy transfer probability of e-h pairs exciting ground-state activators. In addition, the radiative transition probability of excited activators could be decreased due to the increase of temperature. In view of these key factors, the efficiency decrease in cathodoluminescence is the inevitable result. To restrain the efficiency decrease so as to improve the performance in low voltage cathodoluminescence, the conductivity of the phosphor material was improved. By introducing a conductive component, which improves the conductivity of the phosphor material, the performance in low voltage cathodoluminescence was effectively improved.

The electric conductivity of carbon nanotube (CNT)-introduced ZnO matrix is not only dependent on the CNT content, but is also dependent on the applied electric field when the CNT content approaches the electrical percolation threshold.

In the harmonic oscillator mode of an optical center in charge transfer (CT) excitation, the vibration frequency ω (in ground state) and ω′ (in CT state) would be decreased in nano-sized Y2O3:Eu3+, leading to the shrinkage in energy span Espan of CT excitation spectrum. The decrease of ω′ results in the decrease of vibration energy Evib of an optical center obtained in CT excitation. In addition, the zero-phonon CT energy Ezp is decreased with the decrease of phosphor size in nano-scale. Based on the changing magnitudes in Ezp and Evib, the change in CT energy ECT was obtained, which is basically consistent with that measured in the experiment.

Due to the frequency resource is limited,the bandwidth required by communication data services is continuously increased,it causes resource shortage of frequency.The ultra narrow band modulation technology EBPSK was as a studying target,the mathematical model of EBPSK power spectral density was established in this paper.Simulated PSD curve of the EBPSK signal,the impact of modulation parameters on the performance of PSD signal was analysised,which include modulation phase and phase jump duration,and the percentage of energy of EBPSK signal in specified bandwidth.Meanwhile,the relationship between the EBPSK signal spectrum utilization and the signal correlation,attenuation band and the error rate was researched to choice EBPSK signal bandwidth,it makes the system performance best.The results showed that the energy of EBPSK signal is highly concentrated in the center frequency,it can realize the ultra narrowband communication and high spectrum utilization.

FPGA curriculum system have been researched because of the current problem of FPGA teaching in university.The digital logic circuit,hardware description language and digital system design are included in the curriculum system.Some methods have been used in teaching,for example demonstration,experiment and task.The students study FPGA base on open practice base and tutorial system.A series of learning methods have been founded.There have been positive and good result in curriculum design,graduation design,student employment and construction of study style.

Aimed at improving the accuracy of the analog-digital conversion in dual-slope ADCs,this paper introduces a high-performance switched-capacitor integrator to replace the conventional active RC integrator.The operation amplifier in this switched-capacitor integrator is composed of a folded cascade input stage and a Class AB output stage and CMOS switches are utilized to suppress charge injection and clock feed-through effects.The simulation of all the circuit modules by EDA simulation software,depending on SMIC 0.18 μm CMOS process,shows that the operation amplifier is capable of a DC gain of 110.3 dB,a unity gain bandwidth of 5.64 MHz,a phase margin of 79°,an output swing of 0.013 3-3 299 mV,and a slew rate of 7.56 MV/s.The switched-capacitor integrator proves quite suitable for the practical applications in the dual-slope ADCs.

Aimed at overcoming the limit by the integration constant RC on the output of conventional current detection,this paper proposes a pipelining dual integration current detection method designed for MCU of the Smart Battery systems.The verification of the modules of the circuit is obtained by SMIC 0.18 μm standard CMOS technology and with the EDA tools of Spectre and Spectre Verilog.With the reference voltage of 0.3 V and the sensitive resistor of 30 mΩ,the final detection current is in the range of 40 mA ～10 A.The two-stage pipelining gives twice as much detection speed as the conventional method.Experimental results show that this method,independent of RC and with a higher detection rate and precision,is capable of the real-time detection of current.

In this paper, the processing of ear identification is introduced in brief, and after making an improvement of moment invariants algorithm, six feature vectors are distilled by the method of high-order moment invariants. By using two kinds of algorithm respectively, ear image is processed to identification. In ear identification, we can learn that the high-order moment invariants in the improved algorithm have the feature of invariance in translation, rotation and scale change. Finally, with the application of a BP artificial neutral network to identify 60 ear images, we get a good experiment result of 91.8% accuracy.