2,921 research outputs found
Reading Voices: Critical Perspectives in Contemporary Poetry Reading
No full textThe paper focuses on voice in relation to contemporary poetic language. The voice of a poet who reads aloud his own composition puts back into play multiple relationships and similarities regarding the process of creating that specific text, as well as the very process of poetic creation. The physical voice has always been tied to poetry, where it often acts as a fracture between syntax and prosody, making evident the variations between the published and the vocal version. Through its vocal execution a text is always re-evoked in a different way within a specific time and space, as well as provided with a new relationship with the subject who is listening and understanding it. By working on Claudio Rodríguez and Manuel Vázquez Montalbán’s vocal rendition of some specific poems, I am focusing on the relationship between voice – as a body gesture and the expression of a particular subjectivity – and authorship. Considering new interdisciplinary approaches stimulated by the study of voice in the arts and humanities, it is crucial to rethinking concepts such as “subject” and “author” as well as “authorship” or “authority”
Effects of 2 different infusion rates of medetomidine on sedation score, cardiopulmonary parameters, and serum levels of medetomidine in healthy dogs.
No full textThe effects of 2 different continuous rate infusions (CRIs) of medetomidine over an 8-hour period on sedation score, selected cardiopulmonary parameters, and serum levels of medetomidine were evaluated in 6 healthy, conscious dogs using a crossover study design. The treatment groups were: CONTROL = saline bolus followed by saline CRI; MED1 = 2 μg/kg body weight (BW) medetomidine loading dose followed by 1 μg/kg BW per hour CRI; and MED2 = 4 μg/kg BW medetomidine loading dose followed by 2 μg/kg BW per hour CRI. Sedation score (SS), heart rate (HR), respiratory rate (RR), temperature (TEMP), systolic arterial pressure (SAP), mean arterial pressure (MAP), and diastolic arterial pressure (DAP), arterial and mixed venous blood gas analyses, lactate, and plasma levels of medetomidine were evaluated at baseline, at various intervals during the infusion, and 2 h after terminating the infusion. Statistical analysis involved a repeated measures linear model. Both infusion rates of medetomidine-induced dose-dependent increases in SS and dose-dependent decreases in HR, SAP, MAP, and DAP were measured. Respiratory rate (RR), TEMP, central venous pH, central venous oxygen tension, and oxygen extraction ratio also decreased significantly in the MED2 group at certain time points. Arterial oxygen and carbon dioxide tensions were not significantly affected by either infusion rate. In healthy dogs, both infusion rates of medetomidine-induced clinically relevant sedative effects, accompanied by typical alpha2 agonist-induced hemodynamic effects, which plateaued during the infusion and subsequently returned to baseline. While additional studies in unhealthy animals are required, the results presented here suggest that medetomidine infusions at the doses studied may be useful in canine patients requiring sedation for extended periods
Effects of 2 different medetomidine infusion rates on selected neurohormonal and metabolic parameters in dogs
No full textThe effects of 2 different 8-hour continuous rate infusions (CRIs) of medetomidine on epinephrine, norepinephrine, cortisol, glucose, and insulin levels were investigated in 6 healthy dogs. Each dog received both treatments and a control as follows: MED1 = 2 μg/kg bodyweight (BW) loading dose followed by 1 μg/kg BW per hour CRI; MED2 = 4 μg/kg BW loading dose followed by 2 μg/kg BW per hour CRI; and CONTROL = saline bolus followed by a saline CRI. Both infusion rates of medetomidine decreased norepinephrine levels throughout the infusion compared to CONTROL. While norepinephrine levels tended to be lower with the MED2 treatment compared to the MED1, this difference was not significant. No differences in epinephrine, cortisol, glucose, or insulin were documented among any of the treatments at any time point. At the low doses used in this study, both CRIs of medetomidine decreased norepinephrine levels over the 8-hour infusion period, while no effects were observed on epinephrine, cortisol, glucose, and insulin
A taxonomic study of the haemoproteidae (Apicomplexa: Haemosporina) of the avian families Fringillidae, Emberizidae, Parulidae, Thraupidae and Icteridae
No full textThe haemoproteids (Haemosporina: Haemoprotcidae) of the avian families Fringillidae, Emberizidae, Parulidae, Thraupidae and Icteridaesensu Edwards (1986) were reviewed, and eight species determined to be valid, all of the basic halteridial or microhalteridial form as defined by Bennett and Peirce (1988). Haemoproteus fringillae (Fringillidae), H. mazzai (Emberizidae), H. chloris (Emberizidae) and H. quiscalus (Icteridae) were redescribed from hapantotype or neohapantotype material from a wider range of hosts and/or locations than in the original descriptions. Haemoproteus loxiae, H. acanthis and H. emberiza were declared nomina inula. H. globulosus, H. macropigmentatus, H. serini, and H. tarkakovskyi were declared synonyms of H, chloris, and H. Iiedymelis was declared a synonym of H. mazzai. The new haemoproteid species Haemoproteus coatneyi (Emberizidae), H. paruli (Parulidae), H. coereha (Parulidae), and H. thraupi (Thraupidae) were described. All hapantotype, neohapantotype and parahapantotype material was deposited in the collection of the International Reference Centre for Avian Haematozoa, Department of Biology, Memorial University of Newfoundland.Bibliography: leaves 76-82
Comparison of Isoflurane and Propofol Maintenance Anesthesia and Evaluation of Cerebrospinal Fluid Lactate and Plasma Lactate Concentrations for Dogs with Intracranial Disease Undergoing Magnetic Resonance Imaging
No full textThis thesis contains two studies. The first study consisted of a prospective, randomized, clinical trial involving twenty-five client-owned dogs with intracranial disease. Each dog was randomly assigned to receive propofol or isoflurane for maintenance of anesthesia, without premedication. All dogs received propofol IV to effect, were intubated and mechanically ventilated (end-tidal carbon dioxide [ETCO2] 30-35 mmHg). Temperature and cardiac output were measured pre- and post-magnetic resonance imaging (MRI). Scores for mentation, neurological status, maintenance, and recovery were obtained. Pulse oximetry, end tidal gases, arterial blood pressure (AP), heart rate (HR) and requirements for dopamine administration to maintain mean AP > 60 mmHg were recorded throughout anesthesia. Cardiac index was higher, while HR was lower, with propofol in dogs younger than 5 years. Dogs receiving isoflurane were 14.7 times more likely to require dopamine. Sedation and maintenance scores and temperature were not different. Mean and diastolic AP were higher in the propofol group. Recovery scores were better with propofol. Change in neurological score from pre- to post-anesthesia was not different between treatments. In the second study, blood and CSF were collected from 11 dogs with intracranial disease after MRI (Group ID-MRI), in 10 healthy dogs post-MRI (Group H-MRI), and in 39 healthy dogs after induction of anesthesia (Group H-Anesth). Groups ID-MRI and H-MRI were induced to anesthesia with propofol, IV to effect, and maintained on isoflurane or propofol. Dogs in H-Anesth were premedicated with acepromazine and hydromorphone, induced with propofol or thiopental, IV to effect, and maintained on isoflurane. Neurologic scores (NS) and sedation scores (SS) were assessed pre-anesthesia in ID-MRI dogs. There was a tendency for higher cerebrospinal fluid lactate (CSFL) in ID-MRI than H-MRI or H-Anesth (p = 0.12). There was agreement between CSFL and plasma lactate (PL) in ID-MRI dogs (p = 0.007), but not in H-MRI (p = 0.45) or H-Anesth (p = 0.15). Of the ID-MRI dogs, those with worse NS had higher CSFL (r2 = 0.44). Propofol showed some advantages to isoflurane in this patient population for maintenance of blood pressure and recovery. The results of the second study warrant further investigation.Ontario Veterinary College Pet Trus
Optimization of highly uncertain feedback in H [infinity]
No full textThis dissertation presents a new mathematical framework to optimize performance of multi-input multi-output feedback systems subject to large dynamical uncertainty. Optimal performance is represented by two-disc type optimization problems defined in appropriate function spaces. These optimizations are interpreted as shortest distance minimizations in special vector valued Hinfinity spaces. Characterization of various predual and dual maximizations shows existence of optimal solutions. Alignment conditions are exploited to show that the optimal solution is flat or "allpass", therefore generalizing a result obtained previously for single-input single-output systems. Detailed analysis gave further quantitative results, in particular absolute continuity of extremal measures is proven. This lead to extremal identities which provide a test of optimality.A novel operator theoretic framework is next developed. Key multiplication operators acting on particular vector-valued Hardy spaces are introduced. Subsequently, the optimizations are shown to be equal to the induced norms of specific operators. The latter are Banach space projections of multiplication operators, therefore analogous to the Sarason operator well known in the standard Hinfinity theory. Further computations show that these operators are in fact combinations of multiplication and Toepltiz operators. Explicit formulas for the optimal controllers are provided through existence of maximal vectors. Then "infinite matrix" representation with respect to a canonical basis is given, and the norms of the relevant operators are approximated by special matrix norms.These results are further generalized to unstable systems using coprime factorization techniques with similar conclusions. Relation to the standard two-block Hinfinity problem is investigated in the context of duality and operator theory. The optimal solution is then shown to be flat, implying that a well known Hankel-Toeplitz operator achieves its norm on its discrete spectrum for (possibly) infinite dimensional systems.Finally, the optimal robust disturbance attenuation problem for continuous time-varying plants subject to continuous time-varying uncertainty, is shown to reduce to finding the smallest fixed point of a two-disc type optimization problem under continuous time-varying control laws. Duality is then applied in the context of nest algebra of causal stable systems, and shows existence of optimal continuous time-varying controllers. It is also shown that for time-invariant nominal plants under time-varying uncertainty, continuous time-varying control laws offer no advantage over time-invariant ones
Community tracking in a cMOOC and nomadic learner behavior identification on a connectivist rhizomatic learning network
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