5 research outputs found
Feasibility study and performance evaluation of low capacity water–LiBr absorption cooling systems functioning in different Algerian climate zones
No full textEmotional discourse in the French press: Analysis of expression about the death of Nahel Merzouk and the riots of 2023
No full textPētījuma mērķis ir noskaidrot emocionālās leksikas intensitāti, valenci un biežumu, kā arī polifonijas un modalizācijas izmantojumu subjektivitātes izpauzšanā. Pētījumā tiek analizēti 17 raksti, kuri publicēti 5 mēnešu periodā. Izmantojot 8 emocionālās leksikas datubāzes, pētījuma procesā tiek atlasīta emocionālā leksika un noskaidrots tās biežums, valence un intensitāte. Savukārt modalizācijas un atbildības uzņemšanās gadījumi tiek analizēti atkarībā no to veida un biežuma. Rezultāti norāda, ka vidēji rakstos emocionālā leksika ir 9,27% no visiem vārdiem. 56% ir pozitīvi vārdi, un 42% ir saspringti. 96,2% no izteikumiem ir aprakstoši, 21,05% ir modalizēti un 57,59% ir polifoniski. Šīs proporcijas 5 mēnešu periodā ir kopumā nemainīgas.The study addresses subjective expression by analyzing affective vocabulary, modalisation and enunciative responsibility. The goal is to study the intensity, valence and frequency of affective vocabulary, and the usage of polyphony and modality. The author analyzes 17 articles that were published over 5 months. With the aid of 8 databases affective words are found and their frequency, valance and intensity is measured. Cases of enunciative responsibility and modalisation are studied according to their types and frequencies. Results indicate that 9.27% of the analyzed words are affective, 56% are positive, 42% are tense. 96.2% of utterances are assertive, 21.05% are modalised, 57.59% are polyphonc. These proportions are relatively stable over time
Measurement of intellectual capital
No full textAbstract
The economy has greatly evolved and changed in the past decades and still evolving. Companies that used to prioritize tangible assets as the only source of value creation, are now focusing on intangible assets to gain and maintain a significant competitive advantage. The very thing that has stimulated the need of finding methods and techniques to measure this Intellectual capital. From this matter, the purpose of this paper is to present de different methods of measuring intellectual capital. These methods are categorized in four groups:
Direct Intellectual Capital methods (DIC) that evaluate intangible assets through the identification of each of its components, Market Capitalization methods (MCM) that use total market value to assess the value of intellectual capital, Return On Assets methods (ROA) and Scorecard Methods (SC). Each group is composed of multiple methods.
Keywords
Intellectual capital, Intangible assets, Measurement, Value creation, Total market value
Cirurgia bariátrica: efeitos em longo prazo sobre marcadores de estresse oxidativo
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Programa de Pos-Graduação em Nutrição, Florianópolis, 2014.Introdução: A obesidade é considerada um estado de estresse oxidativo crônico. O Bypass Gástrico em Y de Roux (BGYR) tem sido eficaz para perda de peso e diminuição das comorbidades, no entanto, pode também exercer efeitos nos marcadores de estresse oxidativo, principalmente diminuindo as defesas antioxidantes. Objetivo: avaliar o efeito da cirurgia bariátrica pelo sobre os marcadores sanguíneos de estresse oxidativo em longo prazo, após 72 meses de cirurgia. Método: Estudo clínico, de coorte prospectivo, que avaliou 20 pacientes submetidos ao BGYR no momento (M) pré-cirúrgico (M0), 6 (M6), 12 (M12), 24 (M24) e 72 (M72) meses após a cirurgia, além de um grupo controle composto por 35 adultos normais para o peso pelo índice de massa corporal (IMC) avaliados uma única vez. Resultados: A média de idade dos participantes ao final do estudo foi de 47 ± 8,42 anos, sendo que 20% apresentavam alguma comorbidade. A média de IMC anterior à BGYR foi de 45,71 ± 6,97 kg/m2, sendo que este diminuiu 38% entre o M0 até 24º mês (17,51 ± 5,50kg/m2, pAbstract : Introduction: Obesity is considered a chronic state of oxidative stress. Roux-en-Y gastric bypass (RYGB) appears to be an effective treatment for weight loss and comorbidities reduction; however it can also exert effects on oxidative stress markers, mainly by de creasing antioxidant defenses.Aim: evaluate the effect of bariatric surgery of Roux-en-Y Gastric Bypass (RYGB) on long-term oxidative-stress blood markers, 72 months after surgery. Method: It is a clinical prospective cohort study that evaluated 20 patients undergoing RYGB in their pre-surgical moment (M0) and 6 (M6), 12 (M12), 24 (M24) and 72 (M72) months after surgery, in addition to a control group of 35 adults at the normal range of body mass index (BMI) who were assessed one only time. Results: At the end of the study, the age mean of the participants was 47 ± 8.42 years, and 20 % had some comorbidity. The BMI mean prior to RYGB was 45.71 ± 6.97 kg/m2, whereas it decreased by 38% from M0 to M24 (17.51 ± 5.50 kg/m2, p < 0.001) and increased again approximately 12% if compared to M24 (p < 0.001), 52% significantly regained weight over the 72 months. The serum concentrations of vitamin C increased throughout the study (p < 0.001), as well as concentrations of vitamin E corrected by triglyceride (TG) and total cholesterol (TC) (p < 0.001). ß-carotene decreased progressively until M72 after surgery (p = 0.008). Reduced glutathione (GSH) andcatalase (CAT) decreased until M24, but showed no difference in M72 in relation to M0. Thiobarbituric Acid Reactive Substances (TBARS) concentrations decreased significantly from M12 to M24 in relation to M0 (p < 0.001 and p = 0.004 respectively); however there was an increase in M72 (p = 0.114), similar to that of M0. Conclusion: GSH, CAT and TBARS markers returned to baseline values 72 months after RYGB, indicating oxidative stress, probably due to the regained weight and or diminisched defense, ß-caroten
Evaluación técnico-económica de un refrigerador solar autónomo usando refrigerantes naturales
No full textEl presente trabajo de investigación de maestría el cual está titulada como “Evaluación Técnico-Económica de un Refrigerador Solar Autónomo Usando Refrigerantes Naturales”, tiene como finalidad comparar el mejor funcionamiento de tres refrigerantes ecológicos como lo son el R600a, R290 y el R717 frente al R134a analizando el COP, el consumo de energía con el uso de un intercambiador de calor como un sistema de recuperación variando su efectividad. La metodología usada fue cualitativa y cuantitativa con enfoque exploratorio, y fue necesario desarrollar un modelo termodinámico para la simulación y dimensionamiento de un sistema de refrigeración que funcione con energía solar fotovoltaica, comparar el redimiendo del sistema de refrigeración solar usando distintos refrigerantes naturales con el refrigerante R134a y analizar la viabilidad económica del sistema de refrigeración solar autónomo. Este estudio se realizó a unas condiciones de trabajo las cuales fueron Tcond de 35°C y 46°C, Tevap de -10°C y -32°C y una efectividad del IXH de 0.0 hasta 0.6; los resultados indicaron que de los tres refrigerantes analizados el R290 es el que mejor funcionamiento tuvo y puede usarse en aplicaciones de refrigeración solar autónoma de pequeña capacidad, el uso de un IXH como sistema de recuperación fue positivo para todos los refrigerantes usados menos para el R 717 donde es preferible no usar el IXH debido a que disminuye su rendimiento, por último se puede decir que es económicamente viable a partir del año 10 el uso de un VCRS con R290 con un solo día de almacenamiento de batería, puesto que si se aumentan los días de almacenamiento se eleva el costo del sistema haciéndose inviable para su aplicación.The present Master's thesis, entitled "Technical-Economic Evaluation of an Autonomous Solar Refrigerator Using Natural Refrigerants", aims to compare the performance of three environmentally friendly refrigerants - R600a, R290, and R717 - with R134a by analyzing the COP, the energy consumption using a heat exchanger as a recovery system and by varying its effectiveness. The methodology used was qualitative and quantitative with an exploratory focus. It was necessary to develop a thermodynamic model for the simulation and sizing of a refrigeration system powered by photovoltaic solar energy, to compare the performance of the solar refrigeration system using different natural refrigerants with R134a and to analyze the economic viability of the autonomous solar refrigeration system. This study was carried out under the following working conditions 35°C and 46°C condenser temperature, -10°C and -32°C evaporator temperature, and heat exchanger efficiency varying from 0.0 to 0.6. The results showed that of the three refrigerants analyzed, R290 gave the best performance. It can be used in small-capacity stand-alone solar cooling applications. Using a heat exchanger as a recovery system benefited all refrigerants except R717, where it is preferable not to use the heat exchanger as it reduces the performance. Finally, it can be concluded that using a vapor compression refrigeration system (VCRS) with R290 becomes economically viable after the 10th year with only one day of battery storage. Increasing the number of days of storage increases the cost of the system and makes it impractical to use.Lista de figuras 9—lista de tablas 10 Capítulo 1: Introducción 12--Planteamiento del problema 14--Justificación 17--Objetivos 19
Diseño metodológico 20--Organización del documento 21--Capítulo 2: Estado del arte 22--Sistema de refrigeración 25--Refrigeración Solar 26--Tendencia en Refrigerantes en los VCRS 29--Avances en refrigeradores domésticos y congeladores 31--Capítulo 3 Metodología 32--Descripción del sistema y consideraciones 32--Balances de energía 35-- Ecuaciones para el dimensionamiento del evaporador y condensador 37--Ecuaciones para el dimensionamiento del sistema solar fotovoltaico autónomo 39--Disponibilidad del recurso solar 39--Demanda energética 40--Dimensionamiento del sistema solar 40-- Dimensionamiento del sistema de acumulación 44--Dimensionamiento del regulador MPPT 47--Ecuaciones para el estudio económico 48--Capítulo 4: Resultados y discusión 51--Validación del modelo 51--Estudio de sensibilidad 56--Efecto de la Temperatura de evaporación, condensación y la efectividad del IHX sobre el COP 56--Efecto de la Temperatura de evaporación, condensación y la efectividad del IHX sobre el consumo de energía del compresor 62--Efecto de la Temperatura de evaporación, condensación y la efectividad del IHX sobre el caudal másico (ṁ) 65--Efecto de la Temperatura de evaporación, condensación y la efectividad del IHX sobre las temperaturas en el compresor y a la salida del IHX. 68--Consumo de energía para el sistema solar fotovoltaico 71--Dimensionamiento del sistema solar fotovoltaico 73--Dimensionamiento del generador fotovoltaico 73--Dimensionamiento del sistema de acumulación 75--Estimación del UA del evaporador y condensador 76--Análisis económico 79--Capítulo 5: Conclusiones y recomendaciones 82--Conclusiones 82--Recomendaciones 84--Publicaciones 84--Referencias 84Magíster en Eficiencia Energética y Energía RenovableMaestrí
