1,721,470 research outputs found
Biomass-based Porous Functional Materials for Photothermal Decontamination of Water
No full textWater is extremely important for all living things. But global economic development, climate change, and population growth have put water resources under stress. Particularly, freshwater production is decreasing continuously. In the coming years, billions of people will be under water stress conditions. So, serious actions need to be taken. Interfacial solar steam generation is a promising and sustainable approach, which uses solar light as a renewable energy source with low environmental impact, to tackle freshwater scarcity. However, low solar absorbance and high heat losses cause poor solar-to-vapour conversion efficiency. In recent years, several photothermal materials have been developed to be used in solar evaporator devices, yet many problems need to be resolved. For instance, photothermal materials should be low-priced, eco-friendly, stable in harsh conditions, and easy to fabricate. Considering these factors, we have developed different sustainable photothermal functional materials using bone and vegetable waste, with highly porous structure, low weight, enhanced wettability, prolonged stability in water, high optical absorbance, low thermal conductivity necessary for that localization, and adequate solar-to-vapour conversion efficiency. The solar evaporation rate achieved is >1.1 kg m-2 h-1 with a solar-to-vapour conversion efficiency of >80% under 1 Sun irradiation. The prepared biomass-based materials can successfully desalinate artificial seawater, and decontaminate synthetic wastewater, (e.g. water containing dye molecules and hazard metal ions) with an efficiency of >98%. Most importantly the developed materials present salt anti-fouling ability and anti-bio-fouling properties. Thus, the multifunctional highly porous biocomposite photothermal materials prepared in this thesis are a cost-effective promising solution for prolonged wastewater decontamination processes. Last but not least, in this thesis, we also propose effective solutions to valorize food waste offering solutions to two major issues of modern society: water shortage and waste management
FIGURE 10 in Systematic significance of pollen morphology in rare endemic taxa of Astragalus L. (Fabaceae)
No full textFIGURE 10. Variation in exine thickness from all investigated taxa.Published as part of Khan, Amjad, Ahmad, Mushtaq, Zafar, Muhammad & Shah, Sayed Afzal, 2022, Systematic significance of pollen morphology in rare endemic taxa of Astragalus L. (Fabaceae), pp. 267-290 in Phytotaxa 561 (3) on page 277, DOI: 10.11646/phytotaxa.561.3.4, http://zenodo.org/record/706993
Multiple input describing function analysis of non-classical aileron buzz
Full text linkThis paper focuses on the computational study of nonlinear effects of unsteady aerodynamics for non-classical aileron buzz. It aims at a comprehensive investigation of the aileron buzz phenomenon under varying flow parameters using the describing function technique with multiple inputs. The limit cycle oscillatory behavior of an asymmetrical airfoil is studied initially using a CFD-based numerical model and direct time marching. Sharp increases in limit cycle amplitude for varying Mach numbers and angles of attack are investigated. An aerodynamic describing function is developed in order to estimate the variation of limit cycle amplitude and frequency with Mach number and angle of attack directly, without time marching. The describing function results are compared to the amplitudes and frequencies predicted by the CFD calculations for validation purposes. Furthermore, a limited sensitivity analysis is presented to demonstrate the potential of the approach for aeroelastic design
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
Astragalus Linnaeus 1753
No full textPollen key to investigated species 1 Sub-prolate.........................................................................................................................................................................................7 + Prolate................................................................................................................................................................................................ 2 2 Perforate to reticulate, polar diameter 28.75 µm........................................................................................................ A. amherstianus + Trizonocolporate, P/E ratio1.36..........................................................................................................................................................3 3 Reticulate to microreticulate, equatorial diameter 21.66 µm............................................................................................. A. auganus + Reticulate............................................................................................................................................................................................4 4 Scabrate, P/E ratio1.47………………………………………….……… A. brahuicus + Tricolporate, length of pore 6.54 µm..................................................................................................................................................5 5 Perforate, length of colpi 25.00 µm............................................................................................................................. A. chorizanthus + Perforate to granulate.........................................................................................................................................................................6 6 Granulate, mesocolpium 22.91 µm................................................................................................................................ A. commixtus 7 Microreticulate to perforate, P/E ratio1.29........................................................................................................................... A. hostilis + Perforate to reticulate, polar diameter 32.58 µm................................................................................................................................8 8 Isopolar, mesocolpium 23.33 µm.................................................................................................................................. A. kuramensis + Trizonocolporate, width of colpi 3.75 µm..........................................................................................................................................9 9 + Reticulate to microreticulate, equatorial diameter 22.91 µm..................................................................................... A. psilacanthus + Perforate, width of pore 10.41 µm..................................................................................................................................................10 10 Scabrate, polar diameter 29.16 µm............................................................................................................................ A. purpurascens + Trizonocolporate, mesocolpium 22.50 µm.......................................................................................................................................11 11 Granulate, equatorial diameter 25.41 µm............................................................................................................................ A. stocksiiPublished as part of Khan, Amjad, Ahmad, Mushtaq, Zafar, Muhammad & Shah, Sayed Afzal, 2022, Systematic significance of pollen morphology in rare endemic taxa of Astragalus L. (Fabaceae), pp. 267-290 in Phytotaxa 561 (3) on page 281, DOI: 10.11646/phytotaxa.561.3.4, http://zenodo.org/record/706993
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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