1,722,357 research outputs found
Tegolophus oblatus Xue, Cheng & Hong 2011
No full textTegolophus oblatus Xue, Cheng & Hong, 2011 Tegolophus oblatus Xue, Cheng & Hong, 2011b: 330–332. Material examined. 4 females and 1 male (slide number NJAUAcariEriH8), from Syringa oblata Lindl. (Oleaceae), Jiagedaqi, Heilongjiang Province, P. R. China, 50°24'27''N, 124°06'43''E, elevation 365m, 17 July 2008, coll. Xiao-Feng Xue, Zhen Wang & Zi-Wei Song. Host. Syringa oblata Lindl. (Oleaceae). Relation to host. Vagrant. Distribution. China (Heilongjiang).Published as part of XUE, XIAO-FENG, GUO, JING-FENG & HONG, XIAO-YUE, 2013, Eriophyoid mites from Northeast China (Acari: Eriophyoidea) , pp. 1-123 in Zootaxa 3689 (1) on page 89, DOI: 10.11646/zootaxa.3689.1.1, http://zenodo.org/record/603121
Near wall flow over urban-like roughness
No full textIn this study, comprehensive measurements over a number of urban-type surfaces with the same area density of 25% have been performed in a wind tunnel. The experiments were conducted at a free stream velocity of 10 m s-1 and the main instrumentation was 120 ° x-wire anemometry, but measurement accuracy was checked using laser Doppler anemometry. The results have confirmed the strong three-dimensionality of the turbulent flow in the roughness sublayer and the depths of the inertial sublayer (log-law region) and roughness sublayer for each surface have been determined. Spatial averaging has been used to remove the variability of the flow in the roughness sublayer due to individual obstacles and it is shown that the spatially averaged mean velocity in the inertial sublayer and roughness sublayer can, together, be described by a single log-law with a mean zero-plane displacement and roughness length for the surface, provided that the proper surface stress is known. The spatially averaged shear stresses in the inertial sublayer and roughness sublayer are compared with the surface stress deduced from form drag measurements on the roughness elements themselves. The dispersive stress arising from the spatial inhomogeneity in the mean flow profiles was deduced from the data and is shown to be negligible compared with the usual Reynolds stresses in the roughness sublayer. Comparisons have been made between a homogeneous (regular element array) surface and one consisting of random height elements of the same total volume. Although the upper limits of the inertial sublayer for both surfaces were almost identical at equivalent fetch, the roughness sublayer was much thicker for the random surface than for the uniform surface, the friction velocity and the roughness length were significantly larger and the 'roughness efficiency' was greater. It is argued that the inertial sublayer may not exist at all in some of the more extreme rough urban areas. These results will provide fundamental information for modelling urban air quality and forecasting urban wind climates
Sheng zhi fa guang qi pao de liu ti li xue mo xing
No full textby Cheng Hong Yung.Thesis (M.Phil.)--Chinese University of Hong Kong, 1998.Includes bibliographical references (leaves 89-93).Text in English; abstract also in Chinese.by Cheng Hong Yung.Chapter 1 --- Introduction to sonoluminescence --- p.1Chapter 2 --- Motion of a bubble in liquid --- p.6Chapter 2.1 --- Trapping the bubble --- p.6Chapter 2.2 --- Motion of the bubble wall --- p.8Chapter 2.3 --- Calculation and discussion --- p.13Chapter 2.3.1 --- Factors affecting the bubble's motion --- p.13Chapter 2.3.2 --- More on Bjerknes force --- p.18Chapter 2.4 --- Chapter summary --- p.18Chapter 3 --- Effect of mass diffusion on the bubble --- p.19Chapter 3.1 --- Mass diffusion across the bubble wall --- p.19Chapter 3.2 --- Results and discussion --- p.22Chapter 3.3 --- The role of noble gases in SL --- p.28Chapter 3.4 --- Chapter summary --- p.29Chapter 4 --- Hydro dynamics of an SL bubble --- p.30Chapter 4.1 --- Hydrodynamic model --- p.33Chapter 4.2 --- Navier-Stoke and Euler equations --- p.35Chapter 4.3 --- "Equation, of state of the gas in the bubble" --- p.37Chapter 4.3.1 --- Equation of state of air --- p.37Chapter 4.3.2 --- Equation of state of argon --- p.39Chapter 4.4 --- Energy equation of the liquid --- p.40Chapter 4.5 --- Boundary conditions for the problem --- p.41Chapter 4.6 --- Motion of the bubble wall --- p.42Chapter 4.7 --- Equation for the power radiated by the bubble --- p.43Chapter 4.8 --- Numerical methods --- p.44Chapter 4.9 --- Chapter summary --- p.45Chapter 5 --- Physical parameters affecting SL --- p.46Chapter 5.1 --- Effect of liquid compressibility --- p.47Chapter 5.2 --- Effect of thermal conduction across the bubble wall --- p.58Chapter 5.3 --- Effect of surface tension --- p.61Chapter 5.4 --- Effects of the EOS's --- p.65Chapter 5.4.1 --- Effect on air --- p.55Chapter 5.4.2 --- Effect on argon --- p.53Chapter 5.5 --- Effects of the bubble gas content --- p.72Chapter 5.6 --- Existence of shock-free picosecond pulse --- p.73Chapter 5.7 --- Chapter summary --- p.78Chapter 6 --- Summary --- p.80Chapter A --- Numerical schemes for the energy equation in the liquid --- p.82Chapter B --- Numerical schemes for the gas dynamics --- p.84Chapter B.l --- The predictor-corrector method --- p.84Chapter B.2 --- The TVD scheme --- p.8
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
Molecular Weight Dependence of Chain Conformation and Counterion Dissociation of Poly(xylylene tetrahydrothiophenium chloride) in the Salt-Free Semidilute Aqueous Solutions
No full textVariations 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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