一种适应于高性能嵌入式闪存的低压灵敏放大器

本文提出了一种适应于高性能嵌入式闪存的低压灵敏放大器,通过采用电流比较技术和自动消失调技术,该灵敏放大器在低电源电压下获得了很好的性能,改善了低电流阈值窗口存储器的读取速度。基于上海宏力半导体制造公司130nm的嵌入式闪存工艺,该灵敏放大器的感应时间在1.5V的电源电压下达到了0.43ns,其感应速度比传统的灵敏放大器提高了46%     

基于纠缠源的非线性贝尔不等式研究

相较于线性贝尔(Bell)不等式,非线性Bell不等式作为一种判据提供了一种新的判别量子关联的方法,利用非线性Bell不等式来研究纠缠态的性质具有重要的现实意义。考虑带有噪声参数的纠缠态可以模拟实际的量子通信过程,通过Matlab进行数值优化找到相应态的最优测量算符,研究了噪声参数对非线性Bell不等式违背的影响。研究结果表明带有噪声的纠缠态在特定情况下也可以违背非线性Bell不等式,而且测量数量越多,对纠缠态的要求越苛刻,这对于实际实验中态的选取与制备具有重要的借鉴和参考意义。     

浅谈如何提升局域网安全

随着科技的发展，互联网的普及，企业的网络应用需求越来越频繁，随之产生的安全问题也变得越来越重要。如果单位局域网系统遭遇安全袭击，那么可能会给企业各方面带来严重的损失。ARP攻击、黑客入侵、非法窃取等越来越多的安全问题摆放在我们的面前，怎样有效地保护企业网络运行安全已成为企业管理者或网络管理员迫切需要解决的问题，下面我给大家介绍几种常用的办法，以提高企业局域网的安全性能。     

Research on image segmentation of Miao costume patterns based on the RSKP-UNet model北大核心CSCD

The Miao nationality is the sixth largest ethnic group in China which has a history of thousands of years. It has created a unique material culture and spiritual culture in its development process and the Miao costume is a highly condensed collection of the material and spiritual culture of the Miao nationality. As one of the unique symbols of Miao culture the Miao costume has profound cultural heritage and cultural connotations. The patterns of the Miao costume are particularly eye-catching as they not only symbolize the wisdom of the Miao people in thousands of years of production and life but also symbolize the pursuit of the good spirit of the Miao people. However under the impact of modern pop culture and foreign culture these cultural symbols are gradually disappearing. In order to protect and inherit them the Miao costume pattern segmentation has become the most important work. However the Miao costume pattern segmentation is quite difficult. At present there are few studies on the extraction classification identification and preservation of the features of Miao costume pattern segmentation. With the excellent segmentation performance of the U-Net model and the advantages of easy deployment the paper improves the basic structure of the U-Net model and proposes a Miao costume pattern segmentation algorithm based on the RSKP-UNet Residual Selective-Kernel Parallel U-Net model. The algorithm adds Residual modules in the encoder part of the U-Net model to improve the feature extraction capability of the model and embeds the SKNet modules and ParNet modules in the decoder part to enhance the feature expression capability of the model. The paper uses evaluation metrics to measure the segmentation performance of the model and compares it with four segmentation models based on deep learning. The paper not only combines the current research focus-deep learning and attention mechanism but also introduces the Lovász-hinge loss function to effectively solve the problem of class imbalance in the Miao costume patterns. The RSKP-UNet model is better than other models in various segmentation indicators. Compared with the benchmark model U-Net the Dice coefficient IoU precision recall and accuracy are improved by 6. 98% 11. 07% 2. 89% 6. 75% and 3. 92% . The segmentation algorithm proposed in this paper realizes the extraction of the element content of the Miao costume patterns through image segmentation of Miao costume patterns which can be used to build the Miao costume pattern database in this way thus helping designers relevant researchers and organizations to provide research foundation and completing the protection and inheritance of the Miao costume culture. The paper also provides some reference for the segmentation research of other minority costume patterns. © 2022 Authors. All rights reserved.     

中欧标准在水泥胶砂强度测试中的对比研究

随着中国建筑企业海外业务开拓,中外标准在建筑材料质量、测试方法及性能评价方面的差异给中国建筑施工带来了巨大困扰。本文通过对比中欧标准水泥胶砂强度测试,分析其在仪器设备、实验步骤、结果处理等内容的异同点,为中国建筑企业在水泥性能检测及评价方面提供借鉴依据,规避海外业务风险,并对水泥标准建设的提出几点建议。     

递进式干油集中润滑系统在风电设备中的应用

风电机组的润滑点数量在20～80个不等,使用递进式集中润滑系统是性价比较优的选择。风电机组变桨润滑系统是一种典型的递进式集中润滑系统。风电机组变桨润滑系统采用间隙式定量注脂方式,注脂间隙和单元排量根据风电机组需求订制,间隙时间一般由系统自带PLC进行设置,单元排量由分配器内油腔容积决定。     

电力通信光缆的运行及维护探讨

作为电力系统维护重要组成部分,通信光缆的运行与维护对于提高电力通信光缆的运行质量具有重要作用。文章首先介绍了电力通信光缆故障处理原则,然后具体阐述了电力通信光缆的运行维护措施,以期为相关技术与维护人员提供参考。     

含亚胺结构片段的喹唑啉酮衍生物的合成与抗肿瘤活性研究

设计并合成了一系列含亚胺结构片段的新型喹唑啉酮衍生物,最终的15个化合物结构经¹HNMR、¹³CNMR和HR-MS确证,并评价了它们对野生型表皮生长因子受体酪氨酸激酶(EGFR^wt)和两种人癌细胞株(A549、HepG2)的体外抗肿瘤活性。结果表明,部分化合物具有良好的活性,特别是化合物(E)-2-((4-((3,4-二氟亚苄基)氨基)苯氧基)甲基)-3-甲基喹唑啉-4(3 H)-酮对EGFR^wt激酶的IC₅₀达到0.037μmol/L,对A549和HepG2两种肿瘤细胞的IC₅₀值优于吉非替尼。     

基于机器视觉联合模糊控制的船舶桥区避障研究

针对船舶在桥梁通航时易产生巷道效应,从而酿成事故风险的问题,文中提出船舶机器视觉技术联合模糊控制以保证船舶在自动驾驶状态或无人船舶在经过桥洞时能自动避障、安全通航的方法。基本思路是:将CCD点阵摄取的桥梁平面图像通过加权平均算法灰度化,再对图像进行提升对比度及Guass小模板平滑滤波降噪,使得Canndy算子更容易实现亮度梯度为基础的边缘追踪。最后使用Hough Transform算法有效地标记出桥墩位置,以便计算机能通过垂直投影法确定桥墩间距及航向偏差,为舵机模糊控制提供参考。实验结果表明:在自然环境下,该方法能有效检测桥墩间距及航向偏差,并在巷道效应的作用下予以矫正,具有较低的误识性和较强的鲁棒性。     

UT-2000 Ⅳ型五防系统在220kV毕节变的应用

介绍了微机五防系统UT-2000Ⅳ在毕节变的电网安全运行中的应用及管理;分析了该系统在使用和日常维护中发现的一些问题,并提出一些建议.