1,720,955 research outputs found
Wave Scattering of Sierpinski Gasket
No full text這篇論文探討的是一個頂角α的N階希爾賓斯基船帆的波散射。討論方法是藉由在一個基元形狀上作用了連續的平移和放大算符來生成所要的碎形,在適當的近似下去討論散射的性質,進而導出了散射光譜以及相關於出入射角的散射強度。分析散射光譜的性質,可以得到光譜具有兩倍的自相似性,以及對頻帶進行平均後的散射光譜具有乘冪函數的衰減形式,當頂角不是很接近0的時候,他的乘冪指數為-d (d 為希爾賓斯基船帆的碎形維度),而當頂角趨近於0時,他的乘冪指數為ln(5/9)/ln2The scattering of an N-stage Sierpinski gasket with vertical angle1. Introduction...........................................1
1.1 Fractals............................................1
1.2 fractal scattering..................................2
2.The Method of Generation of fractals and Scattering
properties .............................................5
2.1 Fractal generation-iteration model..................5
2.2 The Scattering Spectrum.............................6
3. Wave scattering of Sierpinski gasket...................9
3.1 An N-stage Sierpinski gasket generation.............9
3.2 Scattering spectrum of Sierpinski gasket...........12
3.3 Some representation and approximation of the
Scattering spectrum................................13
3.4 Iteration relation for scattering spectrum.........16
3.5 Characteristics of scattering spectrum.............17
3.5.1 self affinity of scattering spectrum.........18
3.5.2 power law decay of scattering spectrum.......19
3.6 The scattering amplitude depends on scattering angle
...................................................22
4. Conclusion
Two-state growth with transition model and its application to cancer growth system and therapy development
No full text具有異質性的族群是自然界中常見的一種複雜系統，而其中一種讓人感興趣的簡單模型就是僅有兩個子群但彼此會互相競爭且可互相轉換的系統。在本篇的工作中，我們發展了一套描述這樣子的二態成長且具有互相轉換性質系統的數學模型，並且應用這個模型對應到了前列腺癌症腫瘤球在治療之下的真實成長數據。Heterogeneous population is common among complex systems in nature. A simple heterogeneous growth model of interest is one with two states which not only compete with each other but exhibit transition phenomenon. In this work, we develop a mathematical model to describe such a system and apply it to fit the real growth data of the prostate cancer spheroid under treatments
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
