1,721,410 research outputs found
ORC cogeneration systems in waste-heat recovery applications
Get PDFThe performance of organic Rankine cycle (ORC) systems operating in combined heat and power (CHP) mode is investigated. The
ORC-CHP systems recover heat from selected industrial waste-heat fluid streams with temperatures in the range 150 °C – 330 °C. An
electrical power output is provided by the expanding working fluid in the ORC turbine, while a thermal output is provided by the cooling
water exiting the ORC condenser and also by a second heat-exchanger that recovers additional thermal energy from the heat-source
stream downstream of the evaporator. The electrical and thermal energy outputs emerge as competing objectives, with the latter favoured
at higher hot-water outlet temperatures and vice versa. Pentane, hexane and R245fa result in ORC-CHP systems with the highest exergy
efficiencies over the range of waste-heat temperatures considered in this work. When maximizing the exergy efficiency, the second heatexchanger
is effective (and advantageous) only in cases with lower heat-source temperatures (< 250 °C) and high heat-delivery/demand
temperatures (> 60 °C) giving a fuel energy savings ratio (FESR) of over 40%. When maximizing the FESR, this heat exchanger is
essential to the system, satisfying 100% of the heat demand in all cases, achieving FESRs between 46% and 86%
COMPARATIVE INVESTIGATIONS ON LOCALLY PROCESSED ETHYL CELLULOSE AND ETHOCEL®
No full text<p><strong>Abstract:</strong> Sawdust is an industrial waste by-product obtained in the process of smoothing wooden planks. It is readily available and at low prices. Alpha cellulose was extracted from saw dust powder using a standard extraction method. Thereafter the alpha cellulose was subjected to the process of ethylation using diethyl sulphate at 80<sup>o</sup>C for 24 hrs. The derived ethylcellulose was evaluated for its physicochemical properties such as particle size, bulk density, flow rate, Carr`s index, etc. Results indicate that particle size, flow rate, etc. were adequate for its use as a pharmaceutical excipient. These physicochemical characteristics were found to be comparable to that of a commercial excipient, Ethocel<sup>®</sup>. This study has established the possibility of obtaining ethylcellulose, a pharmaceutical excipient from sawdust, an industrial waste product.</p>
<p><strong>Keywords:</strong> Cellulose, Ethylcellulose, flow properties.</p>
<p><strong>Title:</strong> COMPARATIVE INVESTIGATIONS ON LOCALLY PROCESSED ETHYL CELLULOSE AND ETHOCEL<sup>®</sup></p>
<p><strong>Author:</strong> Oyeniyi, Y. J., Oyeniyi F.O.</p>
<p><strong>International Journal of Novel Research in Life Sciences </strong></p>
<p><strong>ISSN 2394-966X</strong></p>
<p><strong>Vol. 10, Issue 5, September 2023 - October 2023</strong></p>
<p><strong>Page No: 21-25</strong></p>
<p><strong>Novelty Journals</strong></p>
<p><strong>Website: www.noveltyjournals.com</strong></p>
<p><strong>Published Date: 02-October-2023</strong></p>
<p><strong>DOI: <a href="https://doi.org/10.5281/zenodo.8398443">https://doi.org/10.5281/zenodo.8398443</a></strong></p>
<p><strong>Paper Download Link (Source)</strong></p>
<p><strong><a href="https://www.noveltyjournals.com/upload/paper/COMPARATIVE%20INVESTIGATIONS-02102023-1.pdf">https://www.noveltyjournals.com/upload/paper/COMPARATIVE%20INVESTIGATIONS-02102023-1.pdf</a></strong></p>International Journal of Novel Research in Life Sciences, ISSN 2394-966X, Novelty Journals, Website: www.noveltyjournals.co
Oyeniyi et al_SOFT COPY.pdf
No full textMAGNETIC SURVEYING AS AN AID TO GEOLOGICAL MAPPING: A CASE STUDY FROM OBAFEMI AWOLOWO UNIVERSITY CAMPUS IN ILE-IFE, SOUTHWEST NIGERIA</div
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
Performance of working fluid mixtures in an ORC-CHP system for different heat demand segments
No full textOrganic Rankine cycle (ORC) power systems are being increasingly deployed for waste heat recovery and
conversion to power in several industrial settings. In the present paper, we investigate the deployment of
working-fluid mixtures in ORCs operating in combined heat and power mode (ORC-CHP) with shaft power
provided by the expanding working fluid and heating provided by the cooling-water exiting the ORC
condenser. Using the flue gas from a refinery boiler as the waste-heat source and with working fluids
comprising normal alkanes, refrigerants and their subsequent mixtures, the ORC-CHP system is
demonstrated as being capable of delivering over 20 MW of net shaft power and up to 15 MW of heating,
leading to a fuel energy savings ratio (FESR) in excess of 20%. Single-component working fluids such as
pentane appear to be optimal at low hot-water supply temperatures. Working-fluid mixtures become optimal
at higher temperatures, with the working-fluid mixture combination of octane and pentane giving an ORCCHP
system design with the highest efficiency. However, in most CHP applications, the fluctuation of heat
demand can determinate a discharge of heating, in particular when a waste-heat source makes profitable the
system operation also in only electricity mode, and if thermal storage options are not considered. For this
reason, the influence of heat demand intensity on the global system conversion efficiency and optimal
working fluid selection is also explored
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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