基于虚拟仪器的肌电信号处理方法研究     

杨广映 《台州学院学报》2006,28(3):38-40,46

根据肌肉收缩力量的大小取决于运动神经纤维传出动作电位频率的特征,采用功率谱比值法对表面肌电信号(SMES)进行特征提取,并通过Labview编程实现算法,计算功率谱中最大值附近一定范围内的能量占整个功率谱能量的比值K。经过多次实验,可以实现根据K值来有效地识别肌肉动作模式。采用虚拟仪器技术可提高测量精度,降低成本,减少计算工作量。  相似文献   

表面张力在生活现象中的应用分析     

冯喜忠 《三门峡职业技术学院学报》2004,3(4):57-58

表面张力是液体的重要性质之一。毛细现象是浸润液体在细管中升高或不浸润液体在细管中降低的现象。它在日常生活和生产中都有着广泛的应用。植物的根茎把地下水输送到茎、叶,人类和动物在呼吸过程中,氧气和二氧化碳在肺泡处的交换,人或动物的血管中混合气泡的危害等,均可用液体的表面张力给以准确的解释。  相似文献   

Surface cleaning? Yes,freshly grated Agar gel,please     

Paolo Cremonesi 《文物保护研究》2016,61(6):362-367

Polysaccharide-based rigid hydrogels are by now well-established means for delivering water or, more generally an aqueous solution, to a surface in a controllable way so as to minimize diffusion and possible side-effects on water-sensitive materials during cleaning treatments. These gels can be applied as pre-formed solid bricks on planar surfaces or brushed onto objects in a semi-solid state. In this note, a different application procedure is presented, suitable for surface cleaning treatments of sensitive painted surfaces: pre-formed rigid gels grated to tiny particles that can be brushed onto the surface. A general discussion on the strategies that can be adopted when water is required to clean a water-sensitive soiled surface is presented, then the new procedure is discussed and a representative case study is shown, supporting the procedure described.  相似文献   

Altered surfaces,taking the long view: Applications of ethnographic conservation practices to the conservation of contemporary art     

Stephanie E. Hornbeck  Dana L. Moffett 《文物保护研究》2016,61(3):84-90

While working together on tradition-based and contemporary works at the Smithsonian's National Museum of African Art (NMAfA) and in private practice, the authors found that their expertise in ethnographic conservation can be applied to the conservation of contemporary works. The treatment approach to ethnographic works has evolved over decades, shifting from alteration of original surfaces and heavy restoration to an emphasis on preserving the original integrity of the artwork through minimal intervention. This paper describes the evolution of ethnographic object conservation regarding surface alteration, while specifically focusing on African objects, and discusses applications of this approach to the conservation of contemporary art. The historical change in treatment attitudes is presented using examples from NMAfA's collections to underscore why the profession developed a minimal intervention approach and to argue for the relevance of this approach to related contemporary media.  相似文献   

Surface reconstruction by offset surface filtering     

DONG Chen-shi  WANG Guo-zhao 《浙江大学学报(A卷英文版)》2005,6(Z1)

The problem of computing a piecewise linear approximation to a surface from its sample has been a focus of research in geometry modeling and graphics due to its widespread applications in computer aided design. In this paper, we give a new algorithm, to be called offset surface filtering (OSF) algorithm, which computes a piecewise-linear approximation of a smooth surface from a finite set of cloud points. The algorithm has two main stages. First, the surface normal on every point is estimated by the least squares best fitting plane method. Second, we construct a restricted Delaunay triangulation, which is a tubular neighborhood of the surface defined by two offset surfaces. The algorithm is simple and robust. We describe an implementation of it and show example outputs.  相似文献   

凤仙花属种子形态及其在分类学上的意义     

鲁迎青  陈艺林 《中国科学院研究生院学报》1991,29(3):252-257

本文首次记载了对分布于峨眉山的凤仙花属Impatiens 12种植物的种子表面显微结构的观察， 并分析了种子表面形态在该属种水平上的分类价值及可能的系统学意义。种皮表层细胞特化、排列方 式、隆起状态、种脊上近合点端的突起、种子末端附属物的有无及其形态等性状被视为凤仙花属种子表 面的主要特征。依据这些性状12种凤仙花种子形态分为两种类型：1．种子表面光滑，无明显大、小细胞 分化。如白花凤仙I．wilsoni可能具3沟花粉凤仙花的种子形态的特点。2．表面粗糙，有明显大、小细 胞的分化及不同程度的细胞隆起，并呈现出多种特异形态．这代表了以一年生草本，4沟花粉为特点的 凤仙花种子形态特征。种子特征与植物体习性、花形态及花粉形态相关，在一定程度上反映了属内类群的分化，因而在凤仙花科、属的分类和系统研究中是不可忽视的性状。  相似文献   

一种新型双通带频率选择表面设计     

李文兴  祁玉 《黑龙江科技信息》2015,(7):73-74

本文提出了一种可以在S/C双波段形成具有高选择性通带的新型FSS,通带中心分别为2GHz和4GHz。讨论了该双通FSS的传输带宽及稳定性问题,仿真结果表明其性能良好。该FSS能用作多频馈源反射天线的副反射器和S/C双频段集成雷达的透波罩,为实现频率复用和提高天线利用率提供了可能性。  相似文献   

建筑表皮系统与建筑节能     

张剑  徐野 《辽宁科技学院学报》2006,8(2):25-26

本文对建筑表皮系统和建筑节能的关系进行了讨论,并通过国内外的一些建筑实例,从工程的角度展示了表皮系统设计对建筑节能的影响,希望通过对表皮系统的合理设计以进一步降低建筑能耗,达到节约能源的目的.  相似文献   

纳米金胶体对吖啶橙水溶液的荧光增强效应     

徐良敏  张焕勤 《宁夏师范学院学报》2010,31(6):31-35,42

以纳米金胶体颗粒为增强衬底,观测了两种不同浓度的吖啶橙水溶液荧光信号的表面增强效应,并用激发光波长与金胶表面等离子体共振的匹配理论,以及近场增强理论解释了所观测到的现象.  相似文献   

基于直接邻域保护嵌入的人脸识别     

孙庆娟 《宁夏师范学院学报》2010,31(6):40-42

直接邻域保护嵌入算法（DNPE）是一种以克服小样本问题而提出的NPE扩展算法,该算法通过同时对角化的方法求解邻域保护嵌入问题,避免矩阵的奇异性.在人脸数据库ORL上的测试结果表明,该算法的识别率比PCA,PCA＋LDA,NPE等算法高.  相似文献