共查询到19条相似文献，搜索用时 421 毫秒
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本文讨论了亚正定阵的不等式理论,得到了亚正定阵的一些新的性质,丰富了亚正定阵理论,也使得亚正定阵的应用更加广泛. 相似文献
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以HELP—正交投影法解析二维色谱重叠峰，提出了一种新的色谱定性方法，正交投影定性法，并将HELP—正交投影解析应用于实际分析体系中可可碱、茶碱与咖啡碱的定性定量分析．十分成功的对重叠严重的咖啡样中可可碱、茶碱与咖啡碱进行了解析，定性定量结果可靠，为复杂样品的色谱分析展示了一种新的途径． 相似文献
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以HELP-正交投影法解析二维色谱重叠峰，提出了一种新的色谱定性方法，正交投影定性法，并将HELP-正交投影解析应用于实际分析体系中可可碱、芬碱与咖啡碱的定性定量分析，十分成功的对重叠严重的咖啡样中可可碱、茶碱与咖啡碱进行了解析，定性定量结果可靠，为复杂样品的色谱分析展示了一种新的途径。 相似文献
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给出了两个酉体（部分酉阵或准酉阵）A与B之和A＋B是酉阵（部分酉阵或准酉阵）的充要条件,同时给出A与B的关系式。 相似文献
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文[1]引进了子式阵及伴随阵的概念，并且对其若干性质进行了研究；本文对子式阵及伴随阵的行列式进行了讨论，得到了相应的结果。 相似文献
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欧氏空间Rn到其子空间L的投影阵(或投影变换)在解决空间点与子空间的投影和距离以及某些极值问题时起到很重要的作用.将它应用在空间解析几何中往往使得求垂足等问题变得简洁.本文给出了空间直线l和平面π的投影矩阵pl,pπ,还给出了一个利用投影阵求空间中点到圆的最短距离的例子. 相似文献
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In this paper, a unified matrix recovery model was proposed for diverse corrupted matrices. Resulting from the separable structure of the proposed model, the convex optimization problem can be solved efficiently by adopting an inexact augmented Lagrange multiplier (IALM) method. Additionally, a random projection accelerated technique (IALM+RP) was adopted to improve the success rate. From the preliminary numerical comparisons, it was indicated that for the standard robust principal component analysis (PCA) problem, IALM+RP was at least two to six times faster than IALM with an insignificant reduction in accuracy; and for the outlier pursuit (OP) problem, IALM+RP was at least 6.9 times faster, even up to 8.3 times faster when the size of matrix was 2 000×2 000. 相似文献
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举例介绍了Fischer投影式和Newman投影式二者相互转换的简易方法及其在立体化学中判断构象间的相互关系、理解反应机理等方面的应用. 相似文献
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This paper examines alternative techniques for projecting freshman enrollment in specific academic departments. Departmental enrollment projections provided by four different projection models are compared to actual departmental enrollments at a selected institution. Two of the models use only historical data, while the other two models are sensitized to current developments as indicated by the expressed major choices of prospective freshmen. The use of discriminant analysis to establish differential enrollment probabilities is also explored.Although different models do a better job for different curricular departments, the smallest mean squared error across all departments was obtained with the simplest projection technique. The use of the preliminary major choice of prospective freshmen did not improve departmental projections, and the student characteristics explored in this study did not differentiate enrolled from non-enrolled students adequately enough to improve enrollment projection accuracy.Based on the results obtained at this one institution, therefore, it would appear that simple and straightforward projection models can be as useful as complex and sophisticated models.This is an expanded version of an earlier paper read at the 1971 Association of Institutional Research Forum in Denver, Colorado. 相似文献
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(A,SA)和(H,SH)都是数域k上的弱Hopf代数,并且A是右H-余模代数。本文证明了:若存在H到A的代数同态i,i同时还是H-余模同态使得i SH=SA i,则存在A的一个子代数B,可在k空间B H上定义代数和余代数结构、对极使其成为与A同构的弱Hopf代数. 相似文献
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罗莉 《四川教育学院学报》2002,18(6):43-44
本文从教学实践中运用投影的再现性功能可调动学生的学习主动性，运用投影手段能模拟物理实验，揭示物理规律，强化物理教学的实验性，运用投影教学能加强信息反馈及教与学的双向交流和提高教学质量三方面，列出在物理教学中的部分投影设计思路。 相似文献
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Jane Medwell 《Literacy》1998,32(3):36-40
Shared reading and writing have emerged as key teaching techniques in the literacy hour and most teachers are becoming familiar with the use of big books and other kinds of enlarged texts. In this article Jane Medwell suggests some possible ways of using the overhead projector in the literacy hour as a source of shared texts. 相似文献
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光栅投射技术在逆向工程中的应用 总被引：1，自引：0，他引：1
Acquisition of physical data with high precision is a key step in reverse engineering ( RE). It is an important stimulative for the progress of reverse engineering with which various digitizing devices are invented, developed and made applicable. This paper introduces a three dimensional optical measurement method based on digital fringe projection technique in RE to improve the technique through its application. A practical example is presented and the result demonstrates the applicability and feasibility of the measurement system as well as the reliability and validity of relevant methods and algorithms. 相似文献
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汪红 《绵阳师范学院学报》1996,(Z1)
本文介绍了射影几何理论在欧氏几何命题证明中的应用及推广,在射影几何观点下探讨一些欧氏几何命题的内在联系,从而加深对欧氏几何理论和方法的理解,获得在较高观点下处理欧氏几何问题的能力. 相似文献