1,354,479 research outputs found
Anatomy of production functions: a technological menu and a choice of the best technology
Get PDFJones (2005) proposed microfoundations for the Cobb-Douglas production function. We show that Jones' technological menu is a special case of a concept of support set discussed by Matveenko (1997) and Rubinov, Glover (1998) by use of a duality approach. We use this approach to clarify the relation between different production functions and technological menus. Also we construct an "ideas model" generating CES production function.Production function, technological menu, Leontief function, Cobb-Douglas function, CES function, duality, support set
Horizontal differentiation and economic growth under Non-CES aggregate production function
No full textWe present a model of economic growth driven by horizontal innovation in which, unlike the existing literature, the final output sector employs a non-specified, non-CES, additive production function. Our motivation in conducting such analysis is based on the recognition that the use of a CES aggregate production function in the final output sector leads to the unrealistic conclusion that the gross markup of price over marginal costs set in the monopolistically-competitive intermediate sector is constant. We derive necessary and sufficient conditions for an equilibrium with perfect competition in the final output market to exist even in the presence of a non-CES technology. These conditions generalize the usual properties of the CES case. We also analyze the long-run relation between economic growth and variable markups
Monopole passband excitation by field emitters in 9 cell TESLA type cavities
No full textWe present an extension of the calculation of dipole mode driven beam break up instabilities, as calculated in [V. Volkov, Phys. Rev. ST Accel. Beams 12, 011301 2009 ; V. Volkov, J. Knobloch, and A. Matveenko, Phys. Rev. ST Accel. Beams to be published ], to the monopole fundamental mode passband. The excitation of these modes has been observed in 9 cell TESLA cavities on test stands without beam [G. Kreps et al., Proceedings of SRF2009 HZB, Berlin, Germany, 2009 , pp. 289 291] and the same effect has been observed in klystrons with high DC currents. DOI 10.1103 PhysRevSTAB.13.084201 PACS numbers 29.27.Bd, 85.25. j, 41.85.Ja, 29.20.E
Participation quorum when voting is costly
No full textUsing a pivotal costly voting model of elections, we study how participation quorum requirements affect voters’ decisions to cast votes, and how they ultimately impact voter and candidate welfare. We solve the model analytically for the case of three voters and then provide numerical solutions for larger numbers of voters, and obtain several consistent results. First, we find that the effect of quorum requirements on voter turnout is non-monotonic and depends on ex-ante support for the candidates. When support for the status-quo is low, a stricter quorum requirement results in higher turnout, while when it is high, the relationship is reversed. Second, we show that a stricter quorum requirement does not necessarily benefit a status quo candidate and can sometimes decrease her chances of winning an election. Third, we characterize optimal quorum requirements from the perspective of voter welfare, and find that, while optimal requirements vary with support for the candidates, too strict and too lenient requirements can be very harmful to voter welfare. Therefore, setting moderate quorum requirements close to half of the number of voters or setting no quorum requirement at all may be reasonable choices. © 2021 The AuthorsHorizon 2020 Framework Programme, H2020; European Research Council, ERC; Grantová Agentura České Republiky, GA ČR: 19-18741Y; Horizon 2020: 740369This research was supported by the Grant Agency of the Czech Republic ; grant 19-18741Y . Andrei Matveenko acknowledges support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 740369 ).This research was supported by the Grant Agency of the Czech Republic; grant 19-18741Y. Andrei Matveenko acknowledges support from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement No. 740369)
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
Impaired Chaperone Activity of Human Heat Shock Protein Hsp27 Site‐Specifically Modified with Argpyrimidine
No full textNon-enzymatic posttranslational modifications (nPTMs) affect at least ∼30 % of human proteins, but our understanding of their impact on protein structure and function is limited. Studies of nPTMs are difficult because many modifications are not included in common chemical libraries or protein expression systems and should be introduced site-specifically. Herein, we probed the effect of the nPTM argpyrimidine on the structure and function of human protein Hsp27, which acquires argpyrimidine at residue 188 in vivo. We developed a synthetic approach to an argpyrimidine building block, which we then incorporated at position 188 of Hsp27 through protein semisynthesis. This modification did not affect the protein secondary structure, but perturbed the oligomeric assembly and impaired chaperone activity. Our work demonstrates that protein function can be altered by a single nPTM and opens up a new area of investigation only accessible by methods that allow site-selective protein modification
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
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
Get PDFThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
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