131,912 research outputs found
Ensayo de tracción de estructuras cuadradas 2-D construidas con fusión por haz de electrones
No full textHoy en día, la fabricación aditiva (AM) hace posible la producción de piezas metálicas complejas, y el uso de la aleación de titanio conocida como Ti6Al4V con AM se ha convertido en una aplicación común en la industria. Uno de los diseños más prometedores para AM es el uso de estructuras de celosía que ofrecen piezas livianas con propiedades de alta resistencia y amortiguación. Debido a estas características, su importancia está aumentando día a día en sectores que requieren alta tecnología como el aeroespacial. En este estudio, dos especímenes de estructura de celosía 2D diferentes que tienen la misma densidad de celosía, pero uno con espesor de pared, el otro sin espesor de pared, se han producido con el método de fusión por haz de electrones y se ha experimentado su resistencia a la tracción. Comparando la deformación de ambas muestras, el espesor de la pared afecta en gran medida los valores de deformación. De acuerdo con las pruebas FEM y de tracción, las muestras con espesor de pared demostraron un comportamiento mejorado de la resistencia a la tracción. La producción se llevó a cabo con los mismos valores de los parámetros de producción. Las superficies de las fracturas se escanean con el microscopio electrónico de barrido (SEM)
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Inhibitory effects of arylcoumarin derivatives on Bacteroides fragilis D-lactate dehydrogenase
No full textBacteroides fragilis is an anaerobic bacterium naturally hosted in the human colon flora. B. fragilis D-lactate dehydrogenase (BfD-LDH) is an important enzyme which catalyzes the conversion of D-lactate to pyruvate and regulates anaerobic glycolysis. In this study BfD-LDH has been targeted for structure based drug design. B. fragilis D-lactate dehydrogenase has been expressed, purified and inhibitory activities of 25 coumarin derivatives previously synthetize for their antioxidant activity were evaluated. Among the 25 coumarin derivatives, compound 6a, 51, and 6b exhibited the highest inhibitory activity with IC50 values of 0,47 mu M, 0,57 mu M ye 0,057 mu M, respectively. The results indicate that the mechanism by which 6a, 51 and 6b coumarin derivatives inhibit BfD-LDH by reversible non-competitive inhibition. Docking experiments were carried out to further explain the results and compare the theoretical and experimental affinity of these compounds to the BfD-LDH protein. According to docking results, all coumarins bind to the site occupied by pyruvate and the nicotinamide ring of NADH. (C) 2019 Elsevier B.V. All rights reserved
BROCKETT, GAVİN D. NE MUTLU TÜRK’ÜM! DİYENE “TÜRK-MÜSLÜMAN KİMLİĞİNİN MÜZAKERESİ”. ÇEV. ÖZGÜR BALKILIÇ, FOL YAYINLARI, 2022
No full textBu çalışmanın konusu, Gavin D. Brockett’inTürkçeye çevrilen “Ne Mutlu Türk’üm! Diyene“Türk-Müslüman Kimliğinin Müzakeresi” isimlikitap çalışmasının incelenmesidir. Çalışmada“Türk milleti” kavramının nasıl oluşturulmayaçalışıldığı, halkın bu kavramı ne zaman ve nasılbenimsediği tartışılmıştır. Yazar bu kavramınözellikle çok partili siyasal hayata geçiştensonra daha çok benimsendiğini iddia etmiş vebu iddiasını o dönemin gazete ve dergilerindeyayınlanan haberler ile desteklemiştir. 1945-1954 yılları arasında milli olan ile İslami olanarasındaki ilişki müzakere edilmek istenmişti
Turn-Taking and Coordination in Human-Machine Interaction
No full textAndrist S, Bohus D, Horvitz E, Mutlu B, Schlangen D, eds. Turn-Taking and Coordination in Human-Machine Interaction. AAAI Spring Symposium. 2015
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
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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
Scholarly Communication and Publishing Lunch and Learn Talk #11: The ULS Open Access Author Fee Fund
No full textAt the May 2014 talk, you will learn about the ULS Open Access Author Fee Fund--what it is, why we do it, how it works, and how the program is going so far
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