AMDS&ADS在手机天线初期设计仿真中的应用

本文简要介绍了一款实物手机天线的初期设计(mockup),同时用AMDS和ADS软件进行协同仿真,得到的仿真和模拟测试结果基本一致,并进一步对该天线在整机中的性能作出评估,极大地缩短了的设计周期,降低了风险。这说明AMDS对天线复杂的电磁仿真可以得到非常接近实际的结果,是一种理想的3D天线分析仿真工具,对天线设计具有很好的指导意义。     

对交流电动机电容器耐久性试验中损耗变化的初步研究

介绍了交流电动机电容器损耗角正切值的主要决定因素,初步探讨了交流电动机电容器损耗角正切值在耐久性试验过程中的变化机理,并建议耐久性试验前后对损耗的变化进行适当规定。     

A Multi-scale Attention-based Facial Emotion Recognition Method Based on Deep Learning

Recently, people have been paying more and more attention to mental health, such as depression, autism, and other common mental diseases. In order to achieve a mental disease diagnosis, intelligent methods have been actively studied. However, the existing models suffer the accuracy degradation caused by the clarity and oc-clusion of human faces in practical applications. This paper, thus, proposes a multi-scale feature fusion network that obtains feature information at three scales by locating the sentiment region in the image, and integrates global feature information and local feature information. In addition, a focal cross-entropy loss function is designed to improve the network''s focus on difficult samples during training, enhance the training effect, and increase the model recognition accuracy. Experimental results on the challenging RAF_DB dataset show that the proposed model exhibits better facial expression recognition accuracy than existing techniques.     

方波电压法测量液体介质低tanδ值的原理和技术关键（续）

介绍了方波电压法测量液体介质tanδ的原理。分析了实现这一测量方法的技术关键。在测量系统的超稳时间、测量时间的控制、测量系统各参数的设置和电流测量仪器选用等方面，提出了通过实践验证的计算方法和解决方案，并证实该方法是测量液体介质低tanδ值，提高测量的分辨率和准确度一个有效途径。     

变压器负载系数与损耗曲线的关系

对两台并运行变压器在自动投切中负载系数与损耗曲线的关系进行了探讨，找出了最佳的运行方案。     

An analytical approach for sizing and siting of DGs in balanced radial distribution networks for loss minimization

This paper presents a novel analytical approach to determine the optimal siting and sizing of distributed generation (DG) units in balanced radial distribution network to minimize the power loss of the system. The proposed analytical expressions are based on a minimizing the loss associated with the active and reactive component of branch currents by placing the DG at various locations. This method first identifies a sequence of nodes where DG units are to be placed. The optimal sizes of DG units at the identified nodes are then evaluated by optimizing the loss saving equations and need only the results of base case load flow. To find out the best location for DG placement, a computational method is also developed. The proposed method has been tested and validated on two IEEE test distribution systems (DSs) consisting of 15 and 33-buses and it has been found that a significant loss saving can be obtained by placing DG units in the system using proposed analytical method.     

高速电主轴电气设计及优化

介绍高速电主轴电气特性和其设计的流程,阐述了对各电主轴关键参数的设计原则。为电主轴优化设计提供重要依据。     

醇类示踪剂技术在江汉油田应用研究

示踪剂的物理化学特性及其与油层岩石和流体的相互作用程度,直接影响示踪剂的流动特性,并对最终解释结果产生影响。室内开展异丙醇和正丁醇的稳定性、流体配伍性、地层吸附损耗等实验。研究表明:醇类示踪剂异丙醇、正丁醇与地层流体具有较好的配伍性、稳定性,且吸附损失相对较小,彼此之间无干扰,适合于井间监测。     

Tympanic temperature and heart rate changes in firefighters during treadmill runs performed with different fireproof jackets

Six well-trained firefighters performed six treadmill runs at 70% of the velocity at VO_2max (Maximal aerobic velocity MAV = 13.26±0.3 km h^-1). A recovery time of 1 week was allowed between trials. The first session was performed by subjects wearing only shorts (i.e. no fire jacket, J0). A similar protocol was applied subsequently to test the physiological eOEects associated with the wearing of one of five different fire jackets: one leather (J1) and four textile-type jackets: VTN^TM with membrane (J2), VTN^TM without membrane (J3), Vidal^TM with Kermel^® HTA (Haute Teneur en Aramide i.e. high density in Aramide) (J4); and Rolland^TM with Kermel^® HTA (J5). All sessions were performed in a randomized order and in laboratory conditions. Exercise with the fireproof jackets resulted in higher tympanic temperature (Tty), heart rate (HR) and body mass loss (BML) changes compared to J0 (p <0.001). The magnitudes of these changes depended on the type of the jacket. Exercise in the leather jacket (J1) resulted in the highest Tty and HR, which diOEered significantly from values in all other conditions (p<0.001). The exercise-induced increases in Tty wearing jackets J3 and J5 were also significantly (p<0.05) higher than those observed with jackets J2 and J4. In conclusion, textile jackets induced less HR and Tty stresses than the leather one. The magnitude of the physiological responses induced by textile jackets were correlated to jacket weight. J2 and J4 jackets were more effective in limiting hyperthermia and any potential detrimental effect on the exercise capacity.     

基于改进YOLO v4光线模糊场景下交通标志检测

近些年,自动驾驶开始进入人们的视线。对于自动驾驶而言,模糊光线场景下的交通标志检测是其中极其重要的一部分。目前YOLO v4算法广泛用于目标检测,虽然它的检测精度相比于其他YOLO版本有着较大的提高,但是还没有达到预期的精度。为了进一步提高检测交通标志的精度,本文在原有YOLO v4的基础上作一定的改进并与MSRCR图像增强处理相结合。首先将作为训练的图片通过MSRCR算法达到图像增强的目的,并将其作为目标检测的训练集图像。使用Darknet-53的YOLO v4网络,通过labelImg标注BelgiumTS交通信号数据集,使用改进的K-means++聚类算法确定先验框和具体参数并且改进路径聚合网络（PANet）结构和损失函数,将数据集进行训练。实验结果表明,改进后的算法与原本的YOLO v4算法相比较,平均精度提高了1.86个百分点。