196,441 research outputs found
Data for: Does limiting pre-movement time during practice eliminate the benefit of practicing while expecting to teach?
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Ignition and extinction fronts in counterflowing premixed reactive gases
No full textWe describe two-dimensional steady propagating flame fronts in the stagnation mixing layer between two opposed streams of the same reactive mixture, the propagation taking place in the direction perpendicular to the plane of strain. The front, which is curved by the nonuniform flow field, separates a chemically frozen region from a region with a twin-flame configuration. The front velocity is calculated in terms of the Lewis number, Le(F), and the Damkohler number, Da. Da, equal to the inverse of the Karlovitz number, is defined as the ratio of the strain time to the transit time through the planar unstrained flame. For the cases corresponding to large Da, difficult to tackle numerically, analytical expressions are given, characterizing the flame shape, and the variation of the burning rate along the flame front from the nose up to the planar trailing branches. For moderately large and low values of Da, the study is carried out numerically, yielding, in particular, the propagation velocity in terms of Da, for different values of Le(F). Different combustion regimes are thus described including flames propagating toward the unburnt mixture, or ignition fronts, standing flames and retreating flames, or extinction fronts. We also describe stationary cylindrical flames of finite-extent, or 2D burning spots. In particular, a critical Lewis number is found, below which negative propagation speeds do not exist while the 2D burning spots mentioned may be encountered. Typically, these exist only for sufficiently small Le(F) if the Da is within a range [Da(min), Da(max)], depending on Le(F). For Da < Da(min), the 2D spots are quenched, whereas as Da is increased, they grow in size, tending to give birth to propagating (ignition) fronts; Da(max) is indeed found to be the smallest Da allowing for ignition fronts. We notice that the range of existence of the 2D spots, for a given Le(F), can overlap with that of retreating (extinction) fronts, and possibly with that of 3D spots, or flame balls, in this flow. However, the 3D case is not addressed in this work
Current advances in the regeneration of degenerated articular cartilage: A literature review on tissue engineering and its recent clinical translation
No full textFunctional ability is the basis of healthy aging. Articular cartilage degeneration is amongst the most prevalent degenerative conditions that cause adverse impacts on the quality of life; moreover, it represents a key predisposing factor to osteoarthritis (OA). Both the poor capacity of articular cartilage for self-repair and the unsatisfactory outcomes of available clinical interventions make innovative tissue engineering a promising therapeutic strategy for articular cartilage repair. Significant progress was made in this field; however, a marked heterogeneity in the applied biomaterials, biofabrication, and assessments is nowadays evident by the huge number of research studies published to date. Accordingly, this literature review assimilates the most recent advances in cell-based and cell-free tissue engineering of articular cartilage and also focuses on the assessments performed via various in vitro studies, ex vivo models, preclinical in vivo animal models, and clinical studies in order to provide a broad overview of the latest findings and clinical translation in the context of degenerated articular cartilage and OA
Exponential Integrators for Fractional Differential Equations
No full textExponential integrators are a well-established class of effective methods for the numerical integration of systems of differential equations of large dimension, especially in the presence of stiffness. Problems of this kind are common in several applications and usually come from semi-discretization of partial differential equations. The main idea behind exponential integrators is to solve in an exact way the stiff term of the problem and hence apply a time-step integration to the non-stiff term, thus to allow to use less expensive explicit schemes and obtain, at the same time, good stability properties. Recently, the investigation of exponential integrators has been generalized to differential equations of fractional order (FDEs). In this context exponential integrators turn out to be very effective since they overcome some of the typical weak points of numerical methods for FDEs: indeed, it is possible to derive methods with excellent stability properties and, when working with linear problems, to surmount some limitations in accuracy and order of convergence which represent a severe constriction for common methods for FDEs. In this Chapter we illustrate the main aspects concerning the derivation of some families of exponential integrators for FDEs and we study the convergence properties. Moreover, we address their numerical implementation with special attention to some peculiar aspects as, for example, the evaluation of Mittag-Leffler functions, with scalar and/or matrix arguments; this is a central feature in the implementation of exponential integrators for fractional order problems. The application to some time- fractional partial differential equations is also presented by means of some numerical examples
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Evaluation of faba bean breeding lines under different rainfed conditions
No full textDrought is one of the major factors limiting faba bean (Vicia faba L.) production in Mediterranean region with irregular water distribution and moisture level below than 500 mm. A major objective of any breeding program in this region is to develop drought-tolerant/resistant genotypes of faba bean that are well adapted to a wide range of environments, since environmental variation causes differential genotypic responses. The objective of this study was to evaluate the response of eight faba bean drought tolerant breeding lines - selected in Tel Hadya (Syria) with moisture level below 300 mm - and three cultivars under rainfed conditions in two stations (Terbol and Kfardan) of the International Center for Agricultural Research in the Dry Areas (ICARDA) representing two different agro-climatic zones in Bekaa, Lebanon during 2008/2009 cropping season. The breeding lines were compared in terms of growth vigor, yield, yield components, harvest index and water use efficiency in both locations. The seasonal accumulated rainfall in Kfardan station (289 mm) was 42% less than that recorded in Terbol station (501 mm). Genotypic variations for several yield characters were recorded in both locations. Plant height, number of nods per plant, number of lateral branches and internodes’ length were higher in Terbol by 14%, 50%, 25% and 48%, respectively, than those recorded in Kfardan. Highest grain yields were recorded in Terbol station by the genotypes ILB1814 (Syrian local large) and ILB1266 (Aguadolce), followed by DT/B7 9013, ILB 1270 Reina Blanca and DT/B7 9005. Similarly in Kfardan, the genotype DT/B7 9013 had the highest grain yield, followed by ILB 1814 (Syrian local large), DT/B7 9005, DT/B7 9043 and ILB 1266 (Aguadolce). The biological yield, total biomass, grain yield, harvest index, number of pods per plant and the number of seeds per plant recorded in Terbol were higher by 39%, 16%, 77%, 30%, 54%, and 53%, respectively, than those recorded in Kfardan. This means lines yielding good under low rainfall area may not perform well under high rainfall environments. The biomass water use efficiency (WUEb) ranged from 0.4 to 0.61 kg m-3 in Terbol and from 0.63 to 0.89 kg m-3 in Kfardan, whereas the grain water use efficiency (WUEg) ranged from 0.32 to 0.61 kg m-3 in Terbol and from 0.36 to 0.55 kg m-3 in Kfardan. The WUEb was significantly higher (by 50%) in kfardan than in Terbol whereas the WUEg in Kfardan was significantly lower (by 8%) than that in Terbol. Thus it seems that the remobilization of assimilates is limited in Kfardan due to the severe terminal drought
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
sj-pdf-1-ajs-10.1177_03635465231172196 – Supplemental material for Clinical Relevance and Function of Anterior Talofibular Ligament Superior and Inferior Fascicles: A Robotic Study
No full textSupplemental material, sj-pdf-1-ajs-10.1177_03635465231172196 for Clinical Relevance and Function of Anterior Talofibular Ligament Superior and Inferior Fascicles: A Robotic Study by Miki Dalmau-Pastor, Hadi El-Daou, Joanna M. Stephen, Jordi Vega, Francesc Malagelada and James Calder in The American Journal of Sports Medicine</p
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
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
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