1,720,961 research outputs found
Abrasivity of Indian Coals - an Assessment
No full textThe performance of any coal wining machine is influenced by a panoply of variables may it be controllable or uncontrollable in nature. The cutting performance of any tool in particular, is governed by various factors such as strength of rock, RQD, fracture spacing, inclination of the bedding planes, insitu state of stress, abrasivity and design parameters of tool namely, width, cutting angle, clearance angle, rake angle and composition of tool etc.
This paper synthesizes the experience gained while studying the cutting performance of shearer into a workable classification known as RAR (Rock Abrasivity Rating), that can help select a feasible cutting system. Assessment of abrasivity and its effect on the performance of cutting tool are brought out. The results of abrasivity studies at the various longwall sites in India viz., VK7, JK5, GDK9 of Singareni Collieries, Dhemomain of ECL and Moonidiah of BCCL susidaries of Coal India Ltd. using an equipment designed and fabricated at Indian School of Mines, Dhanbad known as ISMAT Index are presented and a comparative study of various rock properties such as Rebound Number, Compressive Strenght and NCB Cone Indentor Index with ISMAT Index is also done with an aim to standardise it
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
Improving roadheader performance in Indian coal mines - a system development approach and field investigations
No full textA systematic analysis of the operational and design requirements of mechanized roadway development system (RDS) employing roadheaders is presented in this paper.
The operational and design relationships developed for mechanized roadway development system (MRDS) provide analytical, numerical and empirical tools for improved planning and performance. The mathematical expressions for roadway development rate (RDR), operating time of a roadheader, waiting time of conveyor extensions and roof bolting time were derived. The expressions derived for RDR are for two sets of conditions: (i) under equipment failure conditions (ii) under roof failure conditions.
The objective of this paper is to present a strategy for enhancing the roadway development rate (RDR) employing roadheaders and its validation through Indian case studies. The RDR should match the production rate of roadheader with belt conveyor and roof bolting advance after a careful analysis of the delays encountered in these subsystems. The improved design methodology in a nutshell includes delineation of critical variables and their influence on RDR and development of a deterministic cum stochastic model to finally choose a right roadheader system configuration
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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