1,720,955 research outputs found
Data for Chiral Optical Properties of Metasurfaces Comprised of Chiral Media: Effects of Geometric and Material Chirality
No full textData includes the processed COMSOL simulation results in .csv format for each manuscript figure.Chiral nanomaterials and metamaterials are the subject of intense recent interest, but the principles that govern their design can be challenging to identify. With the emergence of a host of new chiral molecules and nanocrystals, metamaterials can be created from materials that are intrinsically chiral, potentially enhancing chiroptical properties by combining geometrical and material factors. To take advantage of this, we first need to deconvolute the distinct and sometimes competing effects of geometric and material chirality on chiroptical properties. Here, we investigate the role of the meta-atom geometry, optical resonances, and chirality of the constituent medium on the optical chirality enhancement, circular dichroism (CD), g-factor, and relative transmission of LCP versus RCP light (∆T) in metasurfaces comprised of chiral material. We find that overlapping Mie-like resonances in nanodisk arrays lead to 6-fold CD enhancement compared to a uniform film. Our analysis also suggests that making the medium chiral does not necessarily increase CD or g-factor; enhancement in the CD and optical chirality depend on the magnitude of the Pasteur parameter as well as its real and imaginary components. As a demonstration of how geometric and material chirality can be combined to enhance chiroptical properties, we design a geometrically chiral meta-atom out of chiral media and observe over 9-fold enhancement in both CD and g-factor compared to a metasurface comprised of achiral material. This work systematically investigates different approaches to tailoring a chiral response from nanostructured arrays and provides design rules that can be broadly applied to metastructures comprised of chiral media.This work was supported by the National Science Foundation under Award 2102835. The authors acknowledge the Minnesota Supercomputing Institute (MSI) at the University of Minnesota for providing resources that contributed to the research results reported within this paper.Ramamurthy, Maya; Cote, Bryan M; Ferry, Vivian E. (2024). Data for Chiral Optical Properties of Metasurfaces Comprised of Chiral Media: Effects of Geometric and Material Chirality. Retrieved from the Data Repository for the University of Minnesota (DRUM), https://doi.org/10.13020/8FZW-EJ78
Supporting data for Surface Structure Dependent Circular Dichroism in Single and Double Gyroid Metamaterials
No full textFolders are divided by the gyroid's crystallographic orientation. All of the post-processed simulation results are saved as MATLAB .mat files. Files ending in _RTA contain the gyroid's simulated reflection, transmission, and absorption spectra. Files that end in _Fields contain electric field intensity enhancement information. Additional information can be found in Cote_et_al_2022_ReadMe.txt.Data includes the processed FDTD simulation results needed to recreate the figures in "Surface Structure Dependent Circular Dichroism in Single and Double Gyroid Metamaterials". The data files include single and double gyroids' reflection, transmission, and absorption spectra, near-field electric field intensity enhancements, and the gyroid 3D models used in the FDTD simulations.Sponsorship: University of Minnesota Materials Science Research and Engineering Center Award No. DMR-1420013William, Lenart R; Ellison, Christopher J; Ferry, Vivian E; Cote, Bryan M. (2022). Supporting data for Surface Structure Dependent Circular Dichroism in Single and Double Gyroid Metamaterials. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/fp2j-xr45
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
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