137,185 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
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
B. Couvertures des ruelles Kassabet Radouân et el-Kerabieh
No full textBahgat Ali, Herz Max, Fahmy Mahmoud. B. Couvertures des ruelles Kassabet Radouân et el-Kerabieh. In: Comité de Conservation des Monuments de l'Art Arabe. Fascicule 30, exercice 1913, 1914. p. 87
B. — Déclassement d'édifices
No full textSimaïka Marcus H., Falaky Khalil Mahmoud el-, Omar Ahmad, Sayed Metoualli, Pauty Edmond. B. — Déclassement d'édifices. In: Comité de Conservation des Monuments de l'Art Arabe. Fascicule 36, exercice 1930-1932, 1936. p. 33
Strategies for the development of high-performance electrode materials for sustainable Li-, Na-, and K-ion batteries
No full textBatteries have become essential in tackling global warming and energy security. Rechargeable Li-ion technology, by having the highest energy density of any such device, is considered as the battery of choice for electric vehicles and large-scale smart grids. However, lithium ion batteries cannot stand alone to fulfill future needs; therefore, it is urgent to develop new energy storage devices with high safety, lower cost, high energy density and green sustainable to realize mobiles and large-scale applications. Due to the high abundance of sodium and potassium, Na-ion batteries and K-ion batteries have recently emerged as highly promising candidates. In this seminar, we present one-step preparation of composite materials using spray-drying or hydrothermal synthesis routes, two techniques which offer easy scaling-up of production. The objective of this presentation is to demonstrate that the addition of the carbon sources/allotropes during the material preparation allows to control the particle morphology and ensures intimate mixture of the active material and conductive carbon that enhance the electrochemical performance of the electrode materials for Li-, Na- and K-ion batteries [1-6].
References
1- N. Eshraghi, A. Mahmoud, F. Boschini, R. Cloots, EP Patent EP2 (2020) 019, 081, 384.
2- N. Eshraghi, S. Caes, A. Mahmoud, R. Cloots, B. Vertruyen, F. Boschini, Electrochimica Acta, 228 (2017) 319–324.
3. B. Vertruyen, N.Eshraghi, C. Piffet, J. Bodart, A. Mahmoud, F. Boschini. Materials 11 (2018) 1076.
4- C. Karegeya, A. Mahmoud, R. Cloots, B. Vertruyen, F. Boschini, Electrochimica Acta 250 (2017) 49–58.
5. C. Karegeya, A. Mahmoud, F. Hatert, B. Vertruyen, R. Cloots, P-E. Lippens, F. Boschini. J. Power Sources 388 (2018) 57-64.
6. A. Mahmoud, C. Karegeya, M. T. Sougrati, J. Bodart, B. Vertruyen, R. Cloots, P-E. Lippens, F. Boschini. ACS Applied Materials and interfaces 10 (40) (2018) 34202-34211
Pragmatic Case Studies as a Source of Unity in Applied Psychology
No full textTo unify or not to unify applied psychology: that is the question. In this article we review pendulum swings in the historical efforts to answer this question—from a comprehensive, positivist, “top-down,” deductive yes between the 1930s and the early 60s, to a postmodern no since then. A rationale and proposal for a limited, “bottom-up,” inductive yes in applied psychology is then presented, employing a case-based paradigm that integrates both positivist and postmodern themes and components. This paradigm is labeled “pragmatic psychology” and, its specific use of case studies, the “Pragmatic Case Study Method” (“PCS Method”). We call for the creation of peer-reviewed journal-databases of pragmatic case studies as a foundational source of unifying applied knowledge in our discipline. As one example, the potential of the PCS Method for unifying different angles of theoretical regard is illustrated in an area of applied psychology, psychotherapy, via the case of Mrs. B. The article then turns to the broader historical and epistemological arguments for the unifying nature of the PCS Method in both applied and basic psychology.Peer reviewe
Development of Polyanionic Compounds for Li-, Na-, and K-ion Batteries
No full textEnergy storage and conversion systems are regarded as the most important technologies offering sustainable alternatives to address the immense and continuous increase in electrical energy consumption in world (1-3). Batteries are one of the most determining energy storage devices thanks to their wide range of possible applications such as portable devices, electric vehicles, grid storage, etc. The electrodes are the main and determinant units participating in the electrochemical reactions in a battery upon cycling. The performance of electrode materials in Li-ion, Na-ion and K-ion batteries depend not only on their chemical composition but also on their microstructure.
Polyanionic compounds based cathode materials appear to constitute first-rank candidates for green and sustainable electrode materials for secondary batteries. Here, one-step synthesis route using spray is used to produce highly homogeneous, crystalline and impurity-free phosphate-carbon composite electrode materials for Li-ion, Na-ion and K-ion batteries. The electrochemical performance of electrode materials has been enhanced by the addition of the carbon sources/allotropes during the material preparation (3-7).
References
1. A. Mahmoud, M. Al Daroukh, M. Lipinska-Chwalek, M. Luysberg, F. Tietz, R.P. Hermann, Solid State Ionics, 312 (2017), pp. 38-43. https://doi.org/10.1016/j.ssi.2017.10.003
2. C.M. Berger, A. Mahmoud, R.P. Hermann, W. Braun, E. Yazhenskikh, Y.J. Sohn, N.H. Menzler, O. Guillon, M. Bram, J. Am. Ceram. Soc. (2016), https://doi.org/10.1111/jace.14439
3. B. Vertruyen, N.Eshraghi, C. Piffet, J. Bodart, A. Mahmoud, F. Boschini. Materials 11 (2018) 1076. https://doi.org/10.3390/ma11071076.
4. N. Eshraghi, S. Caes, A. Mahmoud, R. Cloots, B. Vertruyen, F. Boschini. Electrochimica Acta 228 (2017) 319–324. https://doi.org/10.1016/j.electacta.2017.01.026
5. J. Bodart, N. Eshraghi, T. Carabin, B. Vertruyen, R. Cloots, F. Boschini, A. Mahmoud. J. Power Sources 480 (2020) 22905. https://doi.org/10.1016/j.jpowsour.2020.229057
6. A. Mahmoud, S. Caes, M. Brisbois, R. P. Hermann, L. Berardo, A. Schrijnemakers, C. Malherbe, G. Eppe, R. Cloots, B. Vertruyen, F. Boschin. J. Solid State Electrochemistry 22 (2018) 103-112. https://doi.org/10.1007/s10008-017-3717-x
7. M. Brisbois, S. Caes, M. T. Sougrati, B. Vertruyen, A. Schrijnemakers, R. Cloots, N. Eshraghi, R. P Hermann, A. Mahmoud, F. Boschini. Solar Energy Materials and Solar Cells 148 (2016) 67–72. https://doi.org/10.1016/j.solmat.2015.09.00
Dr. Edwin Wright Collection: Author Unknown
No full textNotes - The author relates several short stories about his neighbours including Alex McDonell, homesteading and life around Meanook and Athabasca (1 page
Electrode Materials for Li/Na-ion Batteries: Improving Electrochemical Performance Through Carbon Addition During Synthesis
No full textLithium-ion batteries (LIBs) have outperformed other rechargeable battery systems since 1980 and advances in LIBs technology have improved living conditions around the globe. However, Li-ion batteries face many challenges and limitations. Na-ion batteries are considered to be an alternative to Li-ion batteries owing to the natural abundance of sodium. New electrode materials are required to increase the energy density of Li/Na-ion batteries. However, their electronic conductivity usually has to be improved through the preparation of composite powders ensuring intimate contact between the active material and conductive carbon. In this presentation, we report on the one-step synthesis of composite materials using spray-drying or hydrothermal synthesis routes, two techniques which are easily up-scalable[1-6].
In order to evidence the effect of the carbon on the microstructural and electrochemical properties of the prepared materials by a spray-drying [1-3] or hydrothermal methods [4-6]. The crystal and local structures were analyzed by combining XRD and 57Fe Mössbauer spectroscopy. The morphological properties were characterized by SEM and TEM (Figure 1). The carbon content was determined by TG/TDA and carbon analyzer. The electrochemical properties were studied by impedance spectroscopy and galvanostatic cycling in lithium and sodium cells. The reaction mechanism during cycling was investigated by combining operando X-ray diffraction and 57Fe Mössbauer spectroscopy.
References
1- A. Mahmoud, S. Caes, M. Brisbois, R.P. Hermann, L. Berardo, A. Schrijnemakers, C. Malherbe, G. Eppe, R. Cloots, B. Vertruyen, F. Boschini. J. Solid State Electrochemistry 22 (1) (2018) 103-112.
2- N. Eshraghi, S. Caes, A. Mahmoud, R. Cloots, B. Vertruyen, F. Boschini. Electrochimica Acta 228 (2017) 319-324.
3. B. Vertruyen, N.Eshraghi, C. Piffet, J. Bodart, A. Mahmoud, F. Boschini. Materials 11 (2018) 1076.
4- C. Karegeya, A. Mahmoud, R. Cloots, B. Vertruyen, F. Boschini. Electrochimica Acta 250 (2017) 49-58.
5. C. Karegeya, A. Mahmoud, F. Hatert, B. Vertruyen, R. Cloots, P-E. Lippens, F. Boschini. J. Power Sources 88 (2018) 57-64.
6. A. Mahmoud, C. Karegeya, M. T. Sougrati, J. Bodart, B. Vertruyen, R. Cloots, P-E. Lippens, F. Boschini. ACS Applied Materials and interfaces 10 (2018) 34202-34211
Development the iron- and vanadium-based electrode materials for rechargeable Li/Na-ion batteries
No full textLithium-ion batteries have been widely applied as a power source for portable and stationary energy storage systems. Na-ion batteries are considered to be an alternative to Li-ion batteries owing to the natural abundance of sodium. New electrode materials are required to increase the energy density of Li/Na-ion batteries. In this study, we report on the one-step synthesis of composite materials using spray-drying or hydrothermal synthesis routes, two techniques which offer easy scaling-up of production. The objective of this presentation is to show that the addition of the carbon sources during the synthesis leads to control the particles size and ensures intimate contact between the active material and conductive carbon that enhance the electrochemical performance [1-6].
In order to study the effect of the carbon on the structural, morphological and electrochemical properties of the prepared materials by a spray-drying [1-3] or hydrothermal methods [4-6]. The crystal and local structure were analyzed by XRD and 57Fe Mössbauer spectroscopy. The morphological properties were characterized by SEM and TEM. The carbon content was determined by TG/TDA and carbon analyzer. The electrochemical properties were studied by impedance spectroscopy and galvanostatic cycling in lithium cells. The mechanism of the first discharge-charge cycle was investigated by combining operando X-ray diffraction and 57Fe Mössbauer spectroscopy
References
1- A. Mahmoud, S. Caes, M. Brisbois, R.P. Hermann, L. Berardo, A. Schrijnemakers, C. Malherbe, G. Eppe, R. Cloots, B. Vertruyen, F. Boschini, J. Solid State Electrochemistry (2017) 1–10.
2- N. Eshraghi, S. Caes, A. Mahmoud, R. Cloots, B. Vertruyen, F. Boschini, Electrochimica Acta, 228 (2017) 319–324.
3. B. Vertruyen, N.Eshraghi, C. Piffet, J. Bodart, A. Mahmoud, F. Boschini. Materials 11 (2018) 1076.
4- C. Karegeya, A. Mahmoud, R. Cloots, B. Vertruyen, F. Boschini, , Electrochimica Acta 250 (2017) 49–58.
5. C. Karegeya, A. Mahmoud, F. Hatert, B. Vertruyen, R. Cloots, P-E. Lippens, F. Boschini. J. Power Sources. 388 (2018) 57-64.
6. A. Mahmoud, C. Karegeya, M. T. Sougrati, J. Bodart, B. Vertruyen, R. Cloots, P-E. Lippens, F. Boschini. ACS Applied Materials and interfaces, (2018) 10.1021/acsami.8b10663
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