98,880 research outputs found
¿Es China capitalista?
No full textInternational audienceEste libro quiere romper el consenso y perturbar algunas certezas. Por ejemplo, sosteniendo que es un error atribuir los logros de la economía china a la supuesta “adhesión” de este país al capitalismo. La conclusión a la que llegan los autores Rémy Herrera y Zhiming Long es que, hoy, el sistema chino no es capitalista –aunque no sin riesgos de desembocar en el capitalismo– sino una forma de socialismo con mercado, en el que la planificación es, todavía, determinante
Spurious OLS Estimators of Detrending Method by Adding a Linear Trend in Difference-Stationary Processes - A Mathematical Proof and its Verification by Simulation
No full textInternational audiencefirst_pagesettingsOrder Article ReprintsOpen AccessArticleSpurious OLS Estimators of Detrending Method by Adding a Linear Trend in Difference-Stationary Processes—A Mathematical Proof and Its Verification by Simulationby Zhiming LONG1,* and Rémy HERRERA21Research Center for College Moral Education, Tsinghua University, 307C Shanzhai Building, Tsinghua University, Beijing 100084, China2CNRS (National Center for Scientific Research)—UMR 8174 Centre d’Économie de la, Maison des Sciences Economiques de l’Université de Paris 1 Panthéon-Sorbonne 106-112 boulevard de l’Hôpital, 75013 Paris, France*Author to whom correspondence should be addressed.Mathematics 2020, 8(11), 1931; https://doi.org/10.3390/math8111931Received: 2 September 2020 / Revised: 23 September 2020 / Accepted: 25 September 2020 / Published: 2 November 2020(This article belongs to the Section Dynamical Systems)Download Browse FiguresVersions NotesAbstractAdding a linear trend in regressions is a frequent detrending method in economic literatures. The traditional literatures pointed out that if the variable considered is a difference-stationary process, then it will artificially create pseudo-periodicity in the residuals. In this paper, we further show that the real problem might be more serious. As the Ordinary Least Squares (OLS) estimators themselves are of such a detrending method is spurious. The first part provides a mathematical proof with Chebyshev’s inequality and Sims–Stock–Watson’s algorithm to show that the OLS estimator of trend converges toward zero in probability, and the other OLS estimator diverges when the sample size tends to infinity. The second part designs Monte Carlo simulations with a sample size of 1,000,000 as an approximation of infinity. The seed values used are the true random numbers generated by a hardware random number generator in order to avoid the pseudo-randomness of random numbers given by software. This paper repeats the experiment 100 times, and gets consistent results with mathematical proof. The last part provides a brief discussion of detrending strategies
Long-term stability of Au nanoparticle-anchored porous boron-doped diamond hybrid electrode for enhanced dopamine detection
No full textA porous boron-doped diamond (pBDD) was made for immobilizing gold nanoparticles on BDD facets by a special process, wherein methods of magnetron sputtering and thermal catalytic treatment were utilized. Au nanoparticles are seated in the pores of pBDD facets and could be more stable during electrochemical tests. This hybrid structure significantly improved the electrochemical properties due to the introduction of Au nanoparticles and pores, which could increase the specific surface area. The cyclic voltammetry oxidation peak current of the Au/pBDD electrode decreased with an average daily loss of 0.02 μA and maintained approximately 90.1% of its initial value after detecting dopamine once per two days for 30 days, showing an excellent long-term electrochemical stability. In addition, the Au/pBDD electrode exhibited excellent sensitivity for the detection of DA, and the limit of detection was 0.06 μM in a linear concentration range of 0.1 μM–1 mM. This work indicates that the Au/pBDD is an appropriate material for detecting DA in a long-term tests.</p
Frankfurt book fair: cancelled prize ceremony for Palestinian author is part of a long history of political zigzagging
No full textFirst paragraph: The Frankfurt Buchmesse, or book fair, is the world’s largest publishing industry gathering, attracting thousands of exhibitors every October. On one level, it’s a business event focused on creating buzz for forthcoming bestsellers, trading rights and discussing industry developments. On another, it’s a public celebration of books and the values associated with them.https://theconversation.com/frankfurt-book-fair-cancelled-prize-ceremony-for-palestinian-author-is-part-of-a-long-history-of-political-zigzagging-21574
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
The construction of Karen Karnak: The multi-author-function
No full textThis thesis is situated within the comparatively recent developments of Web 2.0 and the emergence of interactive WikiMedia, and explores the mode of authorship within a Read/Write culture compared to that of a Read/Only tradition. The hypothesis of this study is that the role of the audience has become merged with the author, and as such, represents new functions and attributes, distinct from a more conventional concept of authorship, in which the roles of audience and author are more separate. Read/Write and participatory culture, as defined by this study, is focused on collaboration, and includes the influences of D.I.Y. culture, Open-Source practices and the production of text by multiple authors. Multi-authorship presents a re-thinking of several concepts which support the notion of the individual author, since the focus of multi-authorship is not on attribution and ownership of a finished text, but on the continued malleability of a text. Modes of multi-authorship, demonstrated in the use of the pseudonyms Alan Smithee and Karen Eliot, represent declarative authors whose names signify multiple origins, whilst concurrently indicating a distinct body of work. The function of these names form an important context to this study, since primary research involves the construction of an experimental mode of multi-authorship utilising WikiMedia technology and the interaction of thirty nine participants, who are invited to create a body of work under the collective pseudonym Karen Karnak. The data generated by this experiment is analysed using aspects of Michel Foucault's author-function to identify and determine power structures inherent in the WikiMedia context. The interplay of power structures, including concepts such as identity, ownership and the body of work, affect the resulting mode of authorship and contribute to the construction of Karen Karnak, suggesting further areas of research into the emerging multi-author
Nickel-encapsulated carbon nanotubes modified boron doped diamond hybrid electrode for non-enzymatic glucose sensing
No full textA hybrid non-enzymatic glucose sensor made by incorporating boron doped diamond (BDD) film electrode with nickel (Ni)encapsulated carbon nanotubes (CNTs) were facilely fabricated. The CNTs were grown directly on BDD films in the presence of pre-sputtered Ni layer as a catalyst by hot-filament chemical vapor deposition. The morphology and composition of the hybrid structure were assessed by scanning electron microscopy and Raman spectroscopy. As Ni layer thickness increased, the CNTs were less covered on the surface and the length of CNTs increased. The Ni particles were encapsulated into a large number of CNTs. Electrochemical results indicated that this hybrid structure significantly improved the electrochemical performance of BDD due to the increased specific surface area and synergistic effect of Ni and CNTs. The optimized glucose sensor revealed two broad linear range of 1.25 μM - 0.49 mM and 0.49 mM- 6.79 mM, with a high sensitivity of 1642.20 μA mM−1 cm−2 (R2 = 0.9988) and 1374.4 μA mM−1 cm−2 (R2 = 0.9969) respectively. In addition, the hybrid electrode exhibited a low limit of detection which was 1.0 μM (S/N = 3), and good selectivity and stability.</p
L’autografia d'autore: Cambiamenti nella realizzazione e nella concezione del libro dal XII secolo all’invenzione della stampa
No full textIt is generally believed that the invention of printing triggered a cultural change, marking the passage between the medieval idea of the book and the modern one. It should be noted, though, that there was an important evolution through the Late Middle Ages, and that the printing revolution, however crucial, must be placed inside the wider process that from the XIIth century onwards transformed the use and function of writing, of reading and, consequently, the book itself, both theoretically and physically. The aim of this study is to track the cultural roots of the changes in the practices of intellectual work and, viceversa, to determine whether and how such changes may have influenced, through the literary production, late medieval culture. I have focused on the phenomenon of literary autography which, very unusual in the Early Middle Ages, is attested by a new and uninterrupted series of examples from the XIth-XIIth centuries onwards. The cultural landscape of the end of the Middle Ages appears therefore marked by the tension between a recurring drive towards an individualisation of the relation between an author and his work and a strict control by the author over the final product (both philologically and graphically) and an opposite trend leading to the loosening of the author's control over his work, as a natural result of the circulation of the texts but also of a different idea of the authorial role
Author Co-Citation Analysis (ACA): a powerful tool for representing implicit knowledge of scholar knowledge workers
No full textIn the last decade, knowledge has emerged as one of the most important and valuable organizational assets. Gradually this importance caused to emergence of new discipline entitled ―knowledge management‖. However one of the major challenges of knowledge management is conversion implicit or tacit knowledge to explicit knowledge. Thus Making knowledge visible so that it can be better accessed, discussed, valued or generally managed is a long-standing objective in knowledge management. Accordingly in this paper author co- citation analysis (ACA) will be proposed as an efficient technique of knowledge visualization in academia (Scholar knowledge workers)
Synergistic tailoring of band structure and charge carrier extraction in "green" core/shell quantum dots for highly efficient solar energy conversion
No full textEnvironment-friendly colloidal core/shell quantum dots (QDs) with controllable optoelectronic characteristics are promising building blocks for future commercial solar technologies. Herein, we synergistically tailor the electronic band structure and charge carrier extraction of eco-friendly AgInS2 (AIS)/ZnS core/shell QDs via Mn-alloying and Cu-doping in the core and shell, respectively. It is demonstrated that the Mn-alloying in AIS core can broaden the band gap to facilitate delocalization of photogenerated electrons into the shell and further incor-poration of Cu in the ZnS shell enables the creation of Cu-related states that capture the photogenerated holes from core, thus leading to charge carrier recombination and accelerated transfer of photogenerated electrons in the core/shell QDs. As-prepared Mn-AIS/ZnS@Cu QDs were assembled as light harvesters in a photo-electrochemical (PEC) device for light-driven hydrogen evolution, delivering a maximum photocurrent density of ~ 6.4 mA cm-2 with superior device stability under standard one sun irradiation (AM 1.5G, 100 mW cm(-2)). Our findings highlight that simultaneously engineering the band alignment and charge carrier dynamics of "green " core/shell QDs endow the feasibility to design future high-efficiency and durable solar hydrogen pro-duction systems
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