纤维材料动态热机械性能分析方法的研究

目前,由于夹具的限制,动态热机械分析仪难以对纤维样品进行测试。本文利用DMA 8000动态热机械分析仪对纤维材料进行分析,从夹持方式、预加张力、夹持距离、升温速率等方面对测试结果的影响因素进行了研究。试验结果表明,为了保证纤维样品夹持的稳定性、控制测试精度在2℃以内,需使用铝箔对纤维进行前处理,预加张力控制在0.25～0.45 cN/dtex,样品的夹持距离为10 mm,升温速率设置为2℃/min。     

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.     

晨光机床掌控国际炭素装备话语权

中国历来是高精密制造设备进口国,晨光公司高档数控炭素装备生产线的高调出口,堪称我国企业界创新发展的典范。近日,地处苏中大平原扬子江畔的泰兴市晨光高新技术开发有限公司门前披红挂绿,彩旗飘扬,鞭炮齐鸣,戒     

论舞蹈的情感表现

随着社会的进步,舞蹈也有了欧足的发展,舞蹈编创的各个环节都要为舞蹈形象服务,传达出情感!只有这样,作品才能具有艺术性,才能具有艺术的感染力。     

电动势法确定水-丙酮-氯化钠-氯化镁体系热力学性质

采用自行设计的无液体接界电池测定了多组分电解质在水溶液和混合溶剂中不同组成时电池的电动势.利用Pitzer模型拟合实验数据,获得电池的标准电动势E(○)及电解质的活度系数.此外,计算了电解质从纯水到混合溶剂中的迁移吉布斯函数,求得了Pitzer模型的计算参数.获得了NaCl和MgCl2混合电解质的混合参数θ(NaCl)...     

溶液中碳酸氢根在线分析仪的研制

针对CO_2+O_2原地浸出采铀方法中碳酸氢根质量浓度的测定需求,研制了一种溶液中碳酸氢根在线分析仪。介绍了在线分析仪的测定原理、硬件和试剂配制,并对测试流程进行了详细说明。研制的在线分析仪实现了对0~2 000mg/L碳酸氢根质量浓度的测定,对在线分析仪进行的连续测试表明,仪表运行稳定,重复性好,精密度高,与现场手工分析基本一致,加标回收率在97.3%~103%,可满足现场碳酸氢根质量浓度连续、实时监测的需求。在线分析仪不仅可用于地浸采铀中碳酸氢根质量浓度的测定,还可应用于其他领域的相关测定,具有良好的实用性。     

环氧豆油丙稀酸酯齐聚物的合成研究

介绍了环境豆油丙烯酸酯齐聚物的合成步骤，讨论了反应温度、反应时间、催化剂的种类和含量、阻聚剂的含量对齐聚物合成反应的影响。通过试验确定了最佳合成条件，并用红外光谱对齐聚物的结构进行了表征。     

常州轻工职业技术学院周丽华设计作品选 新中式家具设计

正设计说明:当浑厚的木质与青花邂逅,它们原本各自绽放的美丽被紧紧缠绕,散发出无尽的飘逸与韵味。本组新中式家具设计以青花为切入点,结合多元化的材质,将明式家具的一些设计元素提炼成符号,融入现代设计理念,诠释对新中式家具的理解。     

氯化钠从水到乙二醇水混合中的迁移性质

在乙二醇和水为混合溶剂中加入NaCl组成三元系,在20~40℃时,改变混合溶剂中乙二醇的质量分数,在w=0%,10%,20%和30%的条件下,测定下列电池电动势AgCl-Ag|NaCl(mA),C2H6O2(w),H2O(1-w)|Na-ISE,(A)确定混合溶剂中AgCl-Ag和Na-ISE电极对在不同温度时的标准电动势,计算了NaCl的迁移性质。结果表明,低温时NaCl在纯水中有较高的吉布斯自由能状态,而在高温时,NaCl在乙二醇和水的混合溶液中处于较高的吉布斯自由能状态。     

一种数控玻璃切割机运动控制系统的设计

介绍了国内外运动控制系统的研究现状,以及数控玻璃切割机的机械结构和工作原理,针对数控玻璃切割机结构特点和控制功能需求,设计了一套以4轴运动控制器为核心,配合伺服电机组成数控玻璃切割机运动控制系统,并详细介绍了该运动控制系统的各部分组成。同时还设计了相应的人机交互界面,配合硬件系统使用,可以同时实现Y、Z两轴同步运动,Y、Z两轴和X轴平面插补,C轴跟随切割轨迹自动旋转,从而完成玻璃轮廓轨迹的切割加工,并提高生产加工效率。