1,721,460 research outputs found
Synthesis and ring opening of methyl 2-alkyl-3-(alkyl/aryl)-1- benzoylaziridine-2-carboxylates: Synthesis of polysubstituted amino acids
No full textA new method for the preparation of 2,2,3-trisubstituted methyl 1- benzoylaziridine-2-carboxylates is reported. These compounds have been obtained starting from α-alkyl β-amino acids by formation of the lithium dianion and reaction with iodine. The aziridines undergo ring expansion or ring opening, depending on the substituents of the aziridine ring and on the reaction conditions. Following these methods, both α-substituted α-hydroxy β-amino acids and α-substituted β-hydroxy α-amino acids have been synthesised
Smart cities and sustainable finance. The Islamic perspective
Full text linkIn the current global context, policymakers are called to face complex and numerous challenges in achieving sustainable development with rapid urbanization and industrialization. The world’s population is growing, and cities will be increasingly condensed in the future. Nowadays, cutting-edge technologies and digitalization are radically changing urban life and how cities are planned, financed, and managed. A new urban model, known as a “smart city”, is being developed throughout Europe and elsewhere worldwide. In a smart city, all the infrastructures are interconnected and integrated in an efficient and functional way through ICT by optimizing resource consumption, enhancing the quality of public services (Government services) through participatory governance, and increasing citizens’ security. Indeed, urban transformation requires multiple stakeholders to come together toward shared and common goals. City leaders face challenges in enacting changes in balancing the needs of citizens, government, businesses, NGOs, and others: smart city development requires a strategic, long-term vision to create inclusive, fully integrated and synergistic systems. Technological progress is a fundamental requirement for the development of smart cities, but it must be supported by sustainable financial instruments. This paper aims to conduct a comparative analysis of the smart cities’ projects and financial instruments used for implementing those models, traditional as well as innovative and sustainable. In particular, the analysis aims to highlight the ethical financial approach -having in mind the European and Islamic models- that characterizes some of these smart city models and the underlying idea of sustainability
Numerical simulation of flowfields in an Axisymmetric Aerospike nozzle with reacting flow
No full textNumerical simulation of flowfields in an Axisymmetric Aerospike nozzle with reacting flow
No full text
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
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