配电变压器空载损耗的电压校正

本文中作者基于积累的试验数据,对电压偏差造成的配变空载损耗偏差、空载损耗电压校正参数的选择、电压校正对普通硅钢配变和非晶合金配变试验结果的影响进行了分析。     

改进SRGAN的图像超分辨率算法

SRGAN算法虽然具有许多优点,但也存在图像重建效果不够好、参数数量庞大、激活函数表现较差等问题。为此,本文提出一种基于SRGAN的图像超分辨率算法SRGAN-E。该算法首先删除BN层,提高图形的重建效果;再在原生成器模型中加入一维卷积注意力机制,使得图像在重建过程中更加关注上下文信息并减少网络模型中生成器的参数;将SRGAN算法鉴别器模型中的LeakyReLU函数改为Mish函数,以提升鉴别器的性能。实验结果表明:对比SRGAN算法,改进后的SRGAN-E算法在4个测试集上PSNR的平均值增加了0.345,SSIM的平均值增加了0.009;SRGAN-E算法的生成器参数数量与SRGAN算法相比,减少了1 388个。SRGAN-E算法不但提高了图像的重建效果而且还减少了模型参数。     

混合注入式电力滤波器系统硬件研究及工程应用

有源滤波是电力系统谐波治理的主要趋势，根据工程实际应用的需要，研究一种基于TMS320LF2407DSP控制的混合注入式的有源电力滤波器（Hybrid Active Power Filter，HAPF）的系统结构，重点阐述DSP控制系统构成，智能型的IPM模块的应用。该装置在某冶炼厂成功应用，起到了改善电能质量的作用。     

基于Java Servlet的网络流量采集与监控技术

介绍了利用Java开发网络流量检测与监控系统的设计思想和实现方法。系统支持利用基于路由器MIB的SNMP模式、PROBE及NETFLOW等常用的网络流量采集技术；通过后台的Java程序对所得数据进行分析、处理；通过Servlet提供用户交互功能。可有效地监控流量及各种网络异常情况。     

利用Java Swing轻量级组件开发的网络流量账务系统

利用Java语言所提供的轻量级图形用户界面开发工具包Swing，设计开发一个用于处理网络流量及费用的工具软件，通过构建一个结构化的操作界面，可以使得网络流量费用的统计、账单的递送和账务的查询真正实现自动化。     

The influence of chemical treatment and suture on the elastic behavior of calf pericardium utilized in the construction of cardiac bioprostheses

Poor mechanical properties of biological tissue are known to cause wear, leading to the failure of cardiac bioprostheses made of calf pericardium. Different chemical agents such as sodium dodecyl sulfate (SDS) are presently being tested as possible inhibitors of the calcification process. The objective of this report was to determine the mechanical behavior of calf pericardium treated with SDS for 24 h and the influence of the suture on the mechanical properties of the tissue. Forty-eight samples were tested: 24 subjected to a standard treatment with glutaraldehyde (12 sewn with 4/0 silk suture thread) and 24 incubated with SDS for 24 h (12 sewn with the same suture thread). Each sutured and non-sutured sample was cut into two strips to yield paired samples. All were subjected to tensile stress to breaking point. The mean stress at breaking point in the non-sutured series treated with glutaraldehyde alone was 16.42 and 13.85 MPa depending on the region of the pericardium, while in the sutured samples subjected to glutaraldehyde the mean stress was 7.50 and 7.63 MPa, respectively, differences which were statistically significant (p = 0.03 and p = 0.003, respectively) when the means for non-sutured samples from equivalent regions treated with glutaraldehyde were compared. The stress at breaking point was lower in the SDS-treated series, ranging between 2.60 and 3.56 MPa. The mathematical functions that govern the stress/strain or deformation were obtained. In the series of pericardium treated with SDS, deformations of 10% were produced with stresses of under 0.4 MPa, an outcome that is intolerable from the constructive point of view. We established a regression model that enabled us to determine the mechanical behavior of a sutured sample by testing a contiguous piece of tissue, with a high correlation coefficient (r > 0.99). We consider this finding to be of interest in the selection of pericardium for use in the construction of leaflets for cardiac bioprostheses.