1,721,074 research outputs found
Lega fra i "consules et capitanei partis extrinsece Placentie" e i marchesi Malaspina di Val Trebbia: 10 ottobre 1266
No full textFilosofía de la Liberación Latinoamericana.
No full textEn agosto de 2018, en la Universidad Mariana de Pasto-Colombia, dentro de las jornadas del Seminario Internacional “Reflexionando las Disciplinas” de la Facultad de Humanidades y Ciencias sociales, se tuvo la oportunidad de compartir y hacer una conversatorio con el filósofo argentino, naturalizado mexicano Dr. Horacio Cerutti G
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
Outdoor People Detection in Low Resolution Thermal Images
No full textPresence detection is a main functionality to make our living spaces smarter and is implemented through several kinds of sensors and smart devices. Recent advancements in embedded systems market and technology enable the design of sophisticated solutions in a low-cost and scalable fashion. However, applications of presence detection, such as surveillance or occupancy detection, home automation or smart lighting are built for indoor scenarios. Therefore, many systems weaken their performance when applied outdoor, where ambient conditions have higher variability. In this work, we describe our exploratory study on people detection in outdoor scenarios by use of an 8×8 pixels resolution thermal sensor. We tested different techniques to extract the presence of a person crossing the detection area. We observed that signal to noise ratio depends on the difference between background and human body temperature. To address this, we collected a dataset spanning a wide range of background conditions and different user clothing and we used it to tune and evaluate the proposed detection techniques. As a possible solution, we propose to adapt the threshold with temperature, providing a regression curve to select it and demonstrate benefits against the use of a fixed threshold with all explored techniques
Short-term hemodynamic effects of intravenous propionyl-l-carnitine in anaesthetized dogs
No full textThe effects of intravenous administration of propionyl-L-carnitine (PLC) were investigated in anesthetized dogs instrumented for the analysis of general hemodynamic and electrocardiographic data, peripheral blood flows, coronary blood flow and oxygen consumption, urine flow, and renal function. PLC was administered in bolus (20, 60, and 200 mg/kg) or by infusion (20 mg/kg/min * 15 min or 30 mg/kg/min * 10 min). In some cases also L-carnitine (LC) and L-carnitine+propionate (LC + P) were administered in doses equimolar to those of PLC. PLC elicited dose-dependent, short-lasting enhancements of cardiac output, both in open- and closed-chest conditions. Arterial blood pressure, heart rate, and contractility varied slightly and unpredictably; the substance did not elicit electrocardiographic effects. These responses were not changed by alpha- or beta-adrenergic blockade, nor by the administration of a calcium antagonist, but they were abolished or reversed by the combination of such blocking interventions. Mesenteric and iliac blood flows were increased by both PLC and LC; LC + P increased these, and in addition increased renal blood flow. A strong diuresis obtained with PLC, LC, and LC + P was due to osmotic clearance following the administration of hyperosmotic solutions. PLC elicited coronary vasodilation with reduced oxygen extraction; this effect lasted longer than the general hemodynamic effects and was not seen with LC. All the cardiovascular actions of PLC can be attributed to its pharmacologic properties, rather than to its role as a metabolic intermediate
"Non chronotropic" mechanisms on withdrawal of efferent vagal stimulation in anesthetized dogs
No full textWithdrawal of the efferent vagal tone to the heart is an important factor of the increase of cardiac output (CO) and arterial blood pressure (ABP) in several conditions, such as exercise, emotion, postural changes. Vagal withdrawal enhances cardiovascular performance both by increasing heart rate (HR) and by other mechanisms, which were globally named 'non-chronotropic mechanisms'. The nature of these non-chronotropic mechanisms was studied in open-chest dogs under morphine-chloralose anesthesia. After cutting the cervical vagi and all the branches of the stellate ganglia except for the ansae subclaviae, the animals were prepared for recording HR, ABP, CO and left ventricular pressure (LVP). The experiments started during control vagal stimulations and consisted either in turning the vagal stimulators off (STOP), or in raising HR by atrial pacing without withdrawing vagal stimulation (PACE), or in turning the vagal stimulators off while keeping HR constant by atrial pacing since the control vagal stimulation (STPA). Thus, STOP, PACE and STPA produced withdrawal of all vagal effects, of the chronotropic effects and of the non-chronotropic effects, respectively. Non-chronotropic mechanisms were evaluated both as the effects of STPA and as the difference between the effects of STOP and PACE. Experiments were repeated during stellate ganglion stimulation and during simultaneous atrio-ventricular pacing, to evaluate the role of vagosympathetic interactions and of atrial contractility. CO increased by 25% after STOP, by 20% after PACE and by 5% after STPA in the absence of sympathetic stimulation and by 30% after STOP, by 20% after PACE and by 10% after STPA during sympathetic stimulation. Stellate ganglion stimulation doubled non-chronotropic effects probably by potentiating vagal effects on myocardial contractility: after STPA the maximum LVdP/dt increased by 2% without sympathetic stimulation and by 7% with sympathetic stimulation. In all conditions, the increases in ABP after STOP, PACE and STPA were small and not statistically different between STOP and PACE. Simultaneous atrio-ventricular pacing in the absence of sympathetic stimulation nearly abolished non-chronotropic mechanisms, since CO increased to about the same extent both with STOP and with PACE. It is concluded that non-chronotropic mechanisms on vagal withdrawal consist mainly in the enhancement of atrial contractility and in the release of vagal restraint on the sympathetic effects upon the ventricles. © 1989
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