GISAXS and SAXS studies on the spatial structures of Co nanowire arrays

The spatial structures of magnetic Co nanowire array embedded in anodic aluminium membranes were investigated by grazing incidence small angle X-ray scattering (GISAXS) and conventional small angle X-ray scattering (SAXS) techniques. Compared with SEM observation, the GISAXS and SAXS measurements can get more overall structural information in a large-area scale. In this study, the two-dimensional GISAXS pattern was well reconstructed by using the IsGISAXS program. The results demonstrate that the hexagonal lattice formed by the Co nanowires is distorted (a ≈ 105 nm, b ≈ 95 nm). These Co nanowires are isolated into many structure domains with different orientations with a size of about 2 μm. The SAXS results have also confirmed that the nanopore structures in the AAM can be retained after depositing Co nanowires although the Co nanowires can not completely but only just fill up the nanopores. These results are helpful for understanding the global structure of the Co nanowire array.     

经管类实验教学中心IT基础设施运维管理实践

文章以东北财经大学经济管理实验教学示范中心的IT基础设施运维为例,分析实验技术人员对相关IT基础设施包括实验室PC和数据中心服务器运维管理中存在的难点,通过厂商方案调研、技术融合创新、自主实验、IT成本控制方式提升运维效率和服务质量。文章以核心技术自主可控的方式,为实验教学中心的IT基础设施提供最优解决方案的同时,提升实验技术人员在实验教学中心的核心价值,助力信息技术与实验教学的深度融合,为学校实验教学的信息化建设提供重要的技术支撑。     

Characterization of the nanopore structures of PAN-based carbon fiber precursors by small angle X-ray scattering

The nanopore structures in precursors are crucial to the performance of PAN-based carbon fibers. Four carbon-fiber precursors are prepared. They are bath-fed filaments (A), water-washing filaments (B), hot-stretching filaments (C) and drying-densification filaments (D). Synchrotron radiation small angle X-ray scattering is used to probe and compare the nanopore structures of the four fibers. The nanopore size, discrete volume distribution, nanopore orientation degree along the fiber axis and the porosity are obtained. The results demonstrate that the nanopores are mainly formed in the water-washing stage. During the processes of the subsequent production technologies, the slenderness ratio of nanopores and their orientation degree along the fiber axis increase further and simultaneously, the porosity decreases. These results are helpful for improving the performance of the final carbon fibers.     

Hierarchical structure and biomineralization in cricket teeth

The cricket is a truculent insect with stiff and sharp teeth as a fighting weapon. The structure and possible biomineralization of cricket teeth are always interesting. Synchrotron radiation X-ray fluorescence, X-ray diffraction, and small angle X-ray scattering techniques were used to probe the element distribution, possible crystalline structures and size distribution of scatterers in cricket teeth. A scanning electron microscope was used to observe the nanoscaled structure. The results demonstrate that Zn is the main heavy element in cricket teeth. The surface of a cricket tooth has a crystalline compound like ZnFe2(AsO4)2(OH)2(H2O)4 . The interior of the tooth has a crystalline compound like ZnCl2 , which is from the biomineralization. The ZnCl2-like biomineral forms nanoscaled microfibrils and their axial direction points towards the top of the tooth cusp. The microfibrils aggregate randomly into intermediate filaments, forming a hierarchical structure. A sketch map of the cricket tooth cusp is proposed and a detailed discussion is given in this paper.     

林业基础知识教育游戏的角色分析与设计

随着游戏制作技术的进步,教育游戏成为教育领域的一个发展趋势。作为游戏的灵魂,游戏的角色在很大程度上影响着教育游戏的效果。以林业基础知识教育游戏为例详细介绍了游戏角色分析与设计过程。根据项目需求和虚拟环境中各要素分析,最终将角色分为主要角色、辅助型角色和攻击型角色,并对各类角色进行了详细设计。     

OBE理念下《信息服务》课程中思政元素建设的问题研究

当前我国高校教育要求对本科课程进行思政元素建设,在将价值塑造、知识传授及能力培养融为一体的前提下,帮助学生塑造正确的“三观”。因此,高校课程需进行有针对性的改革,在结合OBE理念的基础上,将专业课程知识与思政元素进行融合,以期将学生培养成为具有道德修养、专业能力、文化素质、实践能力及研究能力的人才。本文从基础概念、课程设计思路等方面进行介绍,并在此基础上,分析了目前存在的问题及其原因,并结合《信息服务》课程的实际情况给出相应的解决方法。     

基于改进Lazy Snapping算法的红外图像分割方法研究

针对红外图像含大量噪声以及对比度低等特点,提出一种结合快速模糊C均值聚类的改进Lazy Snapping分割方法.对红外图像使用快速模糊C均值聚类算法进行预分割,通过形态学骨架提取的方法在图像中标记出目标和背景种子点,将Lazy Snapping算法由全局分割转化为聚类区域分割,并构造能量函数,通过最小割算法求解能量函...     

运动人体检测和二维关键点提取

给出了一种运动人体区域的检测及其对应的二维关键点的提取方法。首先运用帧差法构建一个自适应的背景模型以达到背景初始化和背景更新的目的。接着用减背景法实现二维运动人体区域的检测。最后将检测到的运动人体区域,通过运用APAR（anti-paralle lines）区域法实现对运动人体关键点的提取。