协同发展论视域下云南跨境民族教育路径探究

伴随着区域经济一体化的深入发展和"中国——东盟自由贸易区"的推进,在全面推进教育国际化进程中,云南的跨境民族教育代表国门教育.从协同发展论的视角出发,分析云南与周边国家在跨境民族教育合作中存在的问题,并提出云南与周边国家跨境民族教育合作的有效路径.     

线接触副球墨铸铁表面激光织构对摩擦学特性的影响

为研究线接触情况下激光表面织构对球墨铸铁摩擦学特性的影响,采用调Q半导体泵浦YAG激光器,利用单脉冲同点间隔多次激光加工工艺,对球墨铸铁试样端面进行表面织构化处理.制备出4种不同深度、不同面积占有率的环形阵列分布微凹腔,并在滚滑复合运动的圆柱销与圆盘端面线接触式摩擦磨损试验机上,进行摩擦学试验.结果表明:在相同试验条件下,与光滑试样进行对比,微凹腔试样表面具有较好的减摩效果;对不同深度及面积占有率的微凹腔试样进行摩擦性能试验,结果显示:均存在优化设计值使得织构化表面的摩擦因数最小,并表现出良好的抗擦伤性能.     

激光毛化及该区域材料的力学性能试验

为揭示激光参数及辅助工艺参数对毛化形貌的影响规律,研究毛化点区域材料的力学性能,对激光脉冲参数进行系统匹配试验.在Cr12试样上获得了火山口状、球冠状和W状毛化形貌;采用单因素轮换法,研究了辅助气体的类型、压力、角度及脉冲频率对球冠状形貌区域尺寸的影响;同时对火山口形貌区域材料的金相组织和显微硬度进行了观测和测量.结果表明:通过对激光参数和辅助工艺参数进行优化匹配,可以比较精确地控制毛化形貌的形状及其尺寸;氧气不利于球冠状形貌的形成,氮气不利于火山口状形貌的形成;毛化点材料组织为致密的针状马氏体,与基材相比,硬度提高了近3倍.     

基质对周丛生物的影响研究进展

基质被认为是周丛生物变异的主要来源之一.基质在自然水体中多样性造成周丛微生境的多样性.不同天然基质上的周丛群落对水体营养变化的反应存在基质依赖现象,造成生产力贡献的差异.人工基质可统一放置时间、基质材料、结构以及尺寸,从而简化影响因子,用在分析营养、光和其他因子效应的周丛生物受控实验中.利用30篇文献综述了天然基质的多样性及其对周丛生物的影响,比较了不同人工基质在周丛生物研究中的作用,展望了人工基质的应用前景.     

Tuning the magnetic anisotropy in LSMO manganite films through non-magnetic nanoparticles

We report the observation of anomalous magnetic anisotropy driven by nonmagnetic ZrO2 nanoparticles in epitaxial La2/3Sr1/3MnO (LSMO) films grown on LaAlO3 (LAO) substrates. The compressive epitaxial strain imposed by the lattice mismatch of substrate and film is tuned by the density of ZrO2 nanoparticles embedded in the film matrix and affects the magnetic anisotropy as well as the magnetotransport properties. Epitaxial 54 nm thick LSMO thin films with different concentrations of ZrO2 nanoparticles demonstrate anisotropic hysteresis loops concomitant with anisotropic magnetotresistance behavior. The biaxial epitaxial strain, induced by the substrate/film lattice parameter mismatch is partially relaxed by increasing the density of precipitates and they serve as a tuning parameter for the strain state. We interpret our results by a strain-induced interplay of impurity scattering, weak localization and magnetic domain structure.     

Effects of inoculating fungi on agilawood formation in Aquilaria sinensis

Agilawood is a costly heartwood medicine obtained from Aquilaria sinensis with active ingredients mainly composed of volatile and semi-volatile substances. However, the formation time of agilawood is quite long and little is known about its formation mechanism. Two highly active fungi obtained from natural agilawood were inoculated on A. sinensis trees to understand their interaction processes and elucidate the transformation rules of induced chemical compositions within different test periods. The results demonstrated that the fungi could successfully colonize living tissues and cells and activate the host defense system, resulting in agilawood accumulation. With increasing time, the main components of A. sinensis converted into constituents or analogs of agilawood and the host exhibited "self-injury" to prevent fungal intrusion and protect other tissues. The data presented here could provide scientific basis for producing agilawood with the two new fungi in a safe, feasible, and sustainable manner without destroying rare Aquilaria plants.     

Range anomaly suppression based on neighborhood pixels detection in ladar range images

Research on the range anomaly suppression algorithm in laser radar (ladar) range images is significant in the application and development of ladar. But most of existing algorithms cannot protect the edge and linear target well while suppressing the range anomaly. Aiming at this problem, the differences among the edge, linear target, and range anomaly are analyzed and a novel algorithm based on neighborhood pixels detection is proposed. Firstly, the range differences between current pixel and its neighborhood pixels are calculated. Then, the number of neighborhood pixels is detected by the range difference threshold. Finally, whether the current pixel is a range anomaly is distinguished by the neighborhood pixel number threshold. Experimental results show that the new algorithm not only has a better range anomaly suppression performance and higher efficiency, but also protects the edge and linear target preferably compared with other algorithms.     

采购管理系统的需求分析与构想

以有线电视网络公司为例,对系统结构以及功能等方面做了初步的构想,并对业务流程进行了分析,按照优化采购管理流程,改善管理机制,从而达到信息共享和提高效率的目的.     

PVA/SiO2/HMDS薄膜的制备及性能研究

采用静电纺丝技术在玻璃基片表面构筑聚乙烯醇(PVA)纳米纤维网膜,以正硅酸丁酯(TEOS)为硅源,通过气相沉积法向PVA纳米纤维网膜间隙中引入SiO2纳米粒子。然后以六甲基二硅氮烷(HMDS)为修饰剂,对玻璃基片表面PVA/SiO2膜进行疏水改性,从而降低其表面能。利用扫描电镜(SEM),静态水接触角(WCA)等测试手段对在玻璃表面制备的PVA/SiO2/HMDS薄膜进行了表征。结果显示,处理过的玻璃基片具有较高的粗糙度,表面水接触角(WCA)达135.7°,表明其具有很好的疏水性能。而且制备的薄膜疏水性能稳定,耐磨性能好,能够保持较好的透明性。因此在高档室外墙体、汽车挡风玻璃、眼镜片等领域具有潜在的应用前景。     

城市事故灾难交通应急等级模糊综合评判模型及应用

为了及时判断城市事故灾难的紧急程度,采取有针对性的应急措施,需要对城市事故灾难交通应急进行分级,并给出判别标准和量化模型．鉴于事故灾难紧急程度的判断因素众多且难以量化,选取影响人数、范围以及路网和交通管理情况等主要的影响因素作为评判指标,根据规范和咨询专家将评判指标划分为4个层次;根据国家的相关规定,将城市事故灾难的交通应急等级划分为4级;运用专家法确定评判指标的评语集和等级评判的权重集,运用最大隶属度法作为等级评判标准,建立城市事故灾难交通应急等级模糊综合评判模型．最后,以武汉市汉正街火灾为例,对模型的适用性进行了校验．