1,720,976 research outputs found
Nonlinear Photonic Crystals and Metasurfaces in Soft-Nanoimprinted Barium Titanate Nanomaterials
No full textFormacije strukturne boje od lipidnih liotropnih tekućih kristala
No full textNature employs structural color for purposes such as camouflage, attraction, and communication [1]. Despite progress in understanding the photonic structures responsible for structural color, the developmental pathways leading to these formations are not well understood [2]. How does a system transition from vesicles to a network-like structure, and what role does sugar play in this process? Is it simply a glue, or does it actively interact with vesicles to influence their organization and function? This project explores these questions using lipidic lyotropic liquid crystals to generate such structures. We use a dissipative particle dynamics (DPD) simulation model to predict and design biological building blocks for structural colors. DPD’s coarse-graining technique enables accurate simulations over larger particle numbers and longer timescales. Our model was tested for spatial and time convergence, ensuring reliability. Visualized trajectories reveal distinct phases with clarity, providing insight into structural evolution. The model also generated phase diagrams for various lipids, which may play a key role in structural coloration in many arthropods. This work advances our understanding of photonic structures and opens avenues for bio-inspired materials engineering.Priroda koristi strukturalne boje za kamuflažu, privlačenje i komunikaciju [1]. Unatoč napretku u razumijevanju fotoničkih struktura odgovornih za strukturalne boje, razvojni putevi koji vode do ovih formacija nisu dobro shvaćeni [2]. Kako sustav prelazi iz vezikula u mrežastu strukturu i koja je uloga šećera u tom procesu? Djeluje li samo kao ljepilo ili aktivno djeluje na vezikule, utječući na njihovu organizaciju i funkciju? Ovaj projekt istražuje ta pitanja koristeći lipidne liotropne tekuće kristale za stvaranje takvih struktura. Koristimo model simulacije diskipativne dinamičke čestice (DPD) za predviđanje i dizajniranje bioloških građevnih blokova za strukturalne boje. Tehnika grubog zrna DPD-a omogućuje točne simulacije na većem broju čestica i dužim vremenskim razmacima. Naš model testiran je za prostornu i vremensku konvergenciju, osiguravajući pouzdanost. Vizualizirane putanje jasno otkrivaju različite faze, pružajući uvid u strukturnu evoluciju. Model je također generirao fazne dijagrame za različite lipide, koji mogu igrati ključnu ulogu u strukturalnom bojanju mnogih člankonožaca. Ovaj rad unapređuje naše razumijevanje fotoničkih struktura i otvara put za bio-inspirirano inženjerstvo novih materijala
Formacije strukturne boje od lipidnih liotropnih tekućih kristala
No full textNature employs structural color for purposes such as camouflage, attraction, and communication [1]. Despite progress in understanding the photonic structures responsible for structural color, the developmental pathways leading to these formations are not well understood [2]. How does a system transition from vesicles to a network-like structure, and what role does sugar play in this process? Is it simply a glue, or does it actively interact with vesicles to influence their organization and function? This project explores these questions using lipidic lyotropic liquid crystals to generate such structures. We use a dissipative particle dynamics (DPD) simulation model to predict and design biological building blocks for structural colors. DPD’s coarse-graining technique enables accurate simulations over larger particle numbers and longer timescales. Our model was tested for spatial and time convergence, ensuring reliability. Visualized trajectories reveal distinct phases with clarity, providing insight into structural evolution. The model also generated phase diagrams for various lipids, which may play a key role in structural coloration in many arthropods. This work advances our understanding of photonic structures and opens avenues for bio-inspired materials engineering.Priroda koristi strukturalne boje za kamuflažu, privlačenje i komunikaciju [1]. Unatoč napretku u razumijevanju fotoničkih struktura odgovornih za strukturalne boje, razvojni putevi koji vode do ovih formacija nisu dobro shvaćeni [2]. Kako sustav prelazi iz vezikula u mrežastu strukturu i koja je uloga šećera u tom procesu? Djeluje li samo kao ljepilo ili aktivno djeluje na vezikule, utječući na njihovu organizaciju i funkciju? Ovaj projekt istražuje ta pitanja koristeći lipidne liotropne tekuće kristale za stvaranje takvih struktura. Koristimo model simulacije diskipativne dinamičke čestice (DPD) za predviđanje i dizajniranje bioloških građevnih blokova za strukturalne boje. Tehnika grubog zrna DPD-a omogućuje točne simulacije na većem broju čestica i dužim vremenskim razmacima. Naš model testiran je za prostornu i vremensku konvergenciju, osiguravajući pouzdanost. Vizualizirane putanje jasno otkrivaju različite faze, pružajući uvid u strukturnu evoluciju. Model je također generirao fazne dijagrame za različite lipide, koji mogu igrati ključnu ulogu u strukturalnom bojanju mnogih člankonožaca. Ovaj rad unapređuje naše razumijevanje fotoničkih struktura i otvara put za bio-inspirirano inženjerstvo novih materijala
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
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