1,721,197 research outputs found
Internal fixation for the treatment of multiple physeal tibial fractures in a dog
No full textThis case report describes a pinning fixation for the treatment of three tibial physeal fractures in a 3 months old mixed-breed dog. The radiographic study revealed the presence of a severely proximal dislocation of the tibial diaphysis along with multiple fractures of the proximal and distal tibial physes, distal femoral physis and fibula as well. An open reduction and internal fixation technique (ORIF) were performed using crossed K-wires for proximal and distal tibialphyseal fixation and a tension band to address the tibial tuberosity avulsion fracture. Postoperative radiographs showed proper fracture reduction, tibia alignment and correct implant positioning. Clinical and radiographic rechecks highlighted a progressive limb weight-bearing gradual resolution of distal limb edema andf racture healing. The described open surgical treatment allowed for a satisfactory clinical outcome as the preservation of limb joint function and tibial anatomy determined an early return to function at 45 days of follow-up
Estimation of multifractal parameters in traffic measurement: An accuracy-based real-time approach
No full textIn this paper, we address the problem of real-time estimation of multifractal features for network traffic. The algorithm accuracy is the major concern in the proposed algorithm. From a statistical point of view, the higher the number of samples used in the estimation, the more accurate the results. However, network traffic in long intervals of time may have a heterogeneous scaling behavior, which would make the estimation results meaningless. We then propose an adaptive strategy that adjusts the length of the estimation interval based on local traffic features, i.e., it is enlarged as long as the traffic shows a homogeneous behavior. The development of this strategy relies on analyzing the variability of multifractality over time in real traffic traces. Simulation results show that the proposed algorithm is characterized by a higher accuracy with respect to a fixed approach. (c) 2005 Elsevier B.V. All rights reserved
CATALYSIS IN APROTIC-SOLVENTS - INTERMOLECULAR AND INTRAMOLECULAR HYDROGEN-BONDING COMPLEXATION
No full textA mechanistic investigation is reported of aminolysis reactions of 2-hydroxy-5-nitro-alpha-toluenesulfonic acid
sultone (1) in aprotic solvents. The n-butylaminolysis of 1 in acetonitrile and in toluene requires two and three
molecules of amine, respectively. In the latter solvent, general bases strongly catalyze the reaction, and their
catalytic constants are well correlated by the hydrogen bonding parameter pKm. These results are interpreted
by a multistep mechanism where each intermediate can be stabilized via hydrogen bonding by general bases.
The mechanistic features depend on the stability of the intermediates and on the solvent characteristics. When
diamines such as polyoxyethylenediamines H 2NCH2(CH2OCH2)nCH2NH2 (2, n=2; 3, n = 4; 4, n = 6) are used as nucleophiles for the reaction with sultone 1 in toluene, much higher reactivities are observed when compared
to reactions of monoamines and alkylenediamines. This represents a novel type of intramolecular catalysis due
to intramolecular hydrogen bonding complexation between oxygen atoms and the ammonium group of the reaction
intermediates (Scheme 111). In toluene 2-4 also display a large basicity
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
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