近十年常温干法精脱硫专利技术发展动态

收集了近十年来国内的常温干法精脱硫专利，并分类列举出各种脱硫剂的物化性质和几种常温精脱硫工艺，重点阐述了该技术的优缺点及其未来发展方向。     

有色丙纶细旦棉型短纤维生产及纺纱技术研究

定性地分析和讨论有色PP细且棉型短纤维生产及其纺纱过程的主要因素,着重探讨有色母粒对成品纤维性能及纺纱过程的影响,确定最佳纺丝工艺条件,控制 PP 有色细且短纤维物理性能,以满足纺纱工艺要求.     

有色双细全牵伸丝的研制开发

从生产实践出发,探讨了33dtex/24f双细全牵伸丝（FDY）丝的生产工艺。在选择工艺参数时应考虑色母粒对纺丝生产的影响。合理地选择纺丝温度、喷丝板孔径、拉伸速度、牵伸倍数可稳定地生产性能良好的FDY丝。     

Effects of parameters on rotational fine blanking of helical gear简

The application of fine blanking to the manufacturing of helical gears directly from a strip has been restricted due to the traditional linear cutting stroke of the punch and die. In this work, rotational fine blanking which combined the linear and rotational motion of punch and counterpunch was applied for the forming of helical gears. A three-dimensional （3D） rigid-plastic finite element model was developed on the DEFORM-3D platform. By finite element simulation and analysis, the influences of key parameters on the punch load and cut surface were investigated. It is shown that： 1） with increasing the counterforce or helical angle, the punch load and the depth of die roll increase; 2） with increasing blank holder force, the punch load increases while the depth of die roll decreases; 3） V-ring indenter facilitates an improvement in the quality. The results of this research reveal the deformation mechanism of rotational fine blanking of helical gears, and provide valuable guidelines for further experimental studies.     

一种改进编码器角度解算过程的方法与实现

在机械电子一直是一个热门学科,其目的是通过软件控制机械操作来代替机械的哑巴解决方案。DS-25旋转电子编码器能够很好地与机械电子应用相匹配,其输出为两路标准的sine和cosine曲线,通过分析sine和cosine数值来计算编码器所对应的绝对角度位置。通过对DS-25的工作模式分析和实际应用情况提出角度解算的改进方案,该方案利用DS-25工作于粗略模式下测试到的角度值来推算精确模式下的信号周期,结合精确模式下测试到的角度值来计算编码器所对应的绝对角度。摒弃其原有的复杂查表过程进而节省电子表格的存储空间,在降低硬件成本的同时提升了软件灵活性。实验证明,算法的改进能够节省约2KB的存储空间,角度位置误差能控制在1‰以内。     

论中国传统女红文化资源的传承和发展

本文从阐述传统女红文化的内涵入手,对女红文化资源面临的危机与表现进行了深入的分析;通过对中国传统女红文化的发展前景进行理论剖析,指出了保护、传承中国传统女红文化资源的必要性,并对传统女红文化的继承和发展提出合理化建议,使中国传统女红文化资源在现代社会得到传承和发展。     

基于多变量形态学特征的健康老年人认知发展预测算法

由于体积、表面积等常规形态学指标对于皮层下核团而言过于笼统,因此传统的形态特征获取手段难以检测到其表面形态的细微变化。为解决这一问题,本文提出了一种针对皮层下核团的精细特征提取算法,并将其应用到老年人认知状态预测任务上。通过表面共形参数化、表面共形表示和基于互信息的表面流配准,提取了46名被试双侧海马和杏仁核各15 000×2个顶点上的形态学特征;通过斑块选择、稀疏编码与字典学习,和最大池化的降维流程,避免了维度诅咒的同时充分保留了核团的纹理信息;最后,以树为弱学习器,采用GentleBoost算法集成了最终的强分类器做认知预测。结果显示,仅纳入海马和杏仁核两个皮层下结构的新颖特征,即可达到85%的预测准确率,为皮层下结构的精细特征发掘提供了新思路。     

Effect of Initial Annealing Temperature on Microstructural Development and Microhardness in High‐Purity Copper Processed by High‐Pressure Torsion

The effect of the initial annealing temperature on the evolution of microstructure and microhardness in high purity OFHC Cu is investigated after processing by HPT. Disks of Cu are annealed for 1 h at two different annealing temperatures, 400 and 800 °C, and then processed by HPT at room temperature under a pressure of 6.0 GPa for 1/4, 1/2, 1, 5, and 10 turns. Samples are stored for 6 months after HPT processing to examine the self‐annealing effects. Electron backscattered diffraction (EBSD) measurements are recorded for each disk at three positions: center, mid‐radius, and near edge. Microhardness measurements are also recorded along the diameters of each disk. Both alloys show rapid hardening and then strain softening in the very early stages of straining due to self‐annealing with a clear delay in the onset of softening in the alloy initially annealed at 800 °C. This delay is due to the relatively larger initial grain size compared to the alloy initially annealed at 400 °C. The final microstructures consist of homogeneous fine grains having average sizes of ≈0.28 and ≈0.34 µm for the alloys initially annealed at 400 and 800 °C, respectively. A new model is proposed to describe the behavior of the hardness evolution by HPT in high purity OFHC Cu.     

基于GPS软件接收机的C/A码捕获算法

为了尽量减少导航电文数据比特跳变带来的影响,在基于FFT的并行码相位搜索算法的基础上,采用两相邻毫秒数据进行捕获,再利用DFT细化频率估计,得到C/A码相位和较精确的载波频率。利用实际采集的数据进行实验,结果证实了该方法能快速有效地对C/A码进行捕获,为后续跟踪环路提供了良好的初始条件。