1,721,265 research outputs found
Development of copper nanocomposite coatings for all-optical ultrasound bioimaging
Full text linkThis thesis details the development of air-stable and photostable copper nanoparticles and, subsequently, elastomeric nanocomposite coatings by focusing on three key areas: 1. Development of copper nanoparticle synthesis routes in an ambient environment; 2. Developing organic dye nanocomposites with specific optical absorption properties; and 3. Optimizing fabrication conditions of the elastomeric component – Polydimethylsiloxane (Sylgard 184).
By varying synthesis parameters, such as capping agent, copper precursors, synthesis temperature and solvent, a range of particle morphologies was synthesised, including nanocubes (15 ~ 500 nm), nanospikes (average 150 nm in length) and sub 10 nm nanoparticles. These colloidal copper nanoparticles demonstrated good stability, with representative studies indicating stability for at least one month when stored in a dark ambient environment.
These copper nanoparticles were fabricated into elastomeric composites via doctor-blading. The majority of these nanocomposites were of sub-100 microns in thickness and measured at over 98% absorption.
Further work entailed incorporating a range of cationic and anionic organic dyes into polymeric nanocomposites to shift and enhance absorbance at specific wavelengths, including observational studies of the interaction of dyes with gold and copper nanoparticles.
Due to their high optical absorption and the ability to be applied onto a wide range of substrates, these nanocomposites are well suited to an emerging biomedical imaging modality, all-optical ultrasound (OpUS), where they undergo rapid localised heating, which causes a pressure rise that propagates as an ultrasound wave upon pulsed laser excitation.
The OpUS performance of the copper nanocomposite coatings was characterised using pulsed (ns-scale) laser excitation at 532 nm. Ultrasound peak-to-peak pressures higher than 2 MPa were achieved with a laser fluence of ~50 mJ/cm2, a conversion efficiency that favourably compares to literature values. Moreover, these nanocomposites demonstrated good photostability, with stable ultrasound pressures after 30 minutes of continuous exposure to laser (laser fluence: 36 mJ/cm2)
Geometry of Banach spaces and its applications.
Full text linkby Yu Man-hei.Bibliography: leaves 80-81Thesis (M.Phil.)--Chinese University of Hong Kong, 198
A Yield Spread Perspective on the Great Financial Crisis: Break-Point Test Evidence
Full text linkWe use a simple partial adjustment econometric framework to investigate the effects of financial crises on the dynamic properties of yield spreads. We find that crises manifest themselves in the form of substantial disruptions revealed by changes in the persistence of the shocks to spreads as much as by in their unconditional mean levels. Formal breakpoint tests confirm that in the U.S. the Great Financial Crisis has been over approximately since the Spring of 2009 and provide a conservative dating centered around the August 2007–June 2009 dates. However, some yield spread series point to an end of the most serious disruptions as early as in December 2008. Some symptoms of an impending crisis re-appear instead in the second half of 2011. We also uncover evidence that the LSAP program implemented by the Fed in the U.S. residential mortgage market has been effective, in the sense that the risk premia in this market have been uniquely
shielded from the disruptive effects of the crisis
Yu Man-ju(兪晩柱)'s Perception and Study on Confucian Classics
No full textThis paper is focused on Yu Man-ju(兪晩柱)'s perception and study on Confucian classics through the analysis of Heumyeong(欽英). The distinct features of Yu Man-ju's understanding of Confucian classics found out in this paper are as follows. First, Yu Man-ju perceived Five classics as the historiography about ancient China and the ideal types of histmical description. So he thought that the one who want to be a good historian must study Five classics. Meanwhile Yu Man-ju considered Four books as the basic of the study of Confucian classics. Second, Yu Man-ju's perception of Confucian classics was systematized by the compilation of reading books for Confucian classics named Heumyeongdokbon(欽英讀本) . His compilation of Heumyeongdokbon was influenced by the form of the Five classics and Four books(四書五經) and Sipsamkyeongjuso(十三經注疏). Third, Yu Man-ju suggested two principles of the study of Confucian classics. One was studying mainly with the body of Confucian classics and the other was using the method of Dok(讀). Dok(讀) is a kind of reading form having the thorough knowledge of Confucian classics through intensive reading and memorization. And actually Yu Man-ju made an effort for practicing his principles when he studied Confucian classics.兪晩柱(1755-1788)의 은 18세기 조선 지식인들의 일기를 대표하는 자료로서, 자기서사로서의 일기의 특성을 구현하고 공사 영역 가운데서 자아의 위치를 탐구하며 사적 영역에 집중하고 있는 면모를 적극적으로 보여주고 있다는 점에서 주목할 만한 자료로 평가받고 있다. 이에 따라 은 자료가 소개된 이래로 많은 연구자들의 관심의 대상이 되었고 그 결과 상당한 연구 성과가 축적되어 왔다. 에 관한 기존 연구들을 검토해 보면, 많은 연구자들이 을 독서일기의 측면에서 주목해 왔음을 볼 수 있다. 주지하는 바와 같이 에는 유만주가 읽었던 수많은 서적들의 주요 내용이 수록되어 있으며, 이는 유만주의 독서 활동, 학문 경향, 문학·예술적 취향 등을 파악하는데 매우 중요한 자료가 되고 있다. 그런데 지금까지 독서일기의 측면에서 을 고찰한 연구는 대부분 한문학 분야에 집중되어 있으며, 그밖에 명·청을 비롯한 외국 수입 상황이나 서적 해제로서의 의 성격 등을 고찰한 연구가 제출되었다
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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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