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Search Results: 1 - 10 of 34013 matches for " LORETO FERNáNDEZ FERNáNDEZ "
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LA FINANCIACIóN EMPRESARIAL: EXPOSICIóN TEóRICA Y ANáLISIS DE LA OPERATIVA. ESTUDIO DE CASOS REALES DESARROLLADOS EN EXCEL
LORETO FERNáNDEZ FERNáNDEZ
Revista Galega de Economía , 2012,
Abstract:
Rese a de "Guidebook 2007 of Medium & Small Caps in the Spanish Exchange" de Ma. Eugenia Escudero Prado [dir.]
Loreto Fernández Fernández
Revista Galega de Economía , 2008,
Abstract:
Dise o e impacto de una OPV en el mercado de valoresespa ol: los casos de Inditez e Iberia
Loreto Fernández Fernández,Sara Fernández López
Revista Galega de Economía , 2001,
Abstract: El éxito de una empresa cuando inicia su andadura en los mercados bursátiles depende de múltiples factores. Ahora bien, el modo de llevar a cabo su salida a bolsa, esto es, su oferta pública de venta inicial, desempe a un papel importante ya que supone su presentación en sociedad . Aunque el proceso de una OPV es similar en sus etapas principales, las circunstancias que rodean a cada empresa en las diferentes fases pueden explicar en parte la posterior evolución de los títulos en el mercado secundario aunque, sin duda, hay que tener en cuenta en este sentido la evolución del mercado en general. A todos estos aspectos haremos referencia a continuación, utilizando de forma ilustrativa dos casos: las dos únicas OPV que se han producido en el mercado espa ol en lo que va de a o y que han constituido ejemplos antagónicos de desarrollo de este tipo de operaciones: Iberia e Inditex.
Características de las PyMES gallegas innovadoras frente a las PyMES no innovadoras
David Rodeiro Pazos,Loreto Fernández Fernández
Revista Galega de Economía , 2006,
Abstract: La innovación es uno de los aspectos más relevantes en el análisis del nivel competitivo de una empresa y, por extensión, de una región o país. Este trabajo, centrado en el ámbito empresarial gallego, es una primera aproximación al estudio de la innovación en el sector de las peque as y medianas empresas, y su principal objetivo es identificar las principales características de las pymes que han llevado a cabo innovaciones frente a aquéllas que no han realizado ninguna. Las empresas que hemos definido como innovadoras poseen un mayor tama o y una preocupación superior ante los factores competitivos que se han considerado en este estudio que las empresas consideradas no innovadoras. Las innovaciones son introducidas por iniciativa propia, mientras que las principales causas aducidas para no realizarlas son la escasez de recursos financieros y humanos y la complejidad de su introducción.
Riesgo cardiovascular: valoración inicial de la cohorte “CDC de Canarias en Venezuela” Cardiovascular risk: initial estimation in the study cohort “CDC of the Canary Islands in Venezuela”
Miguel Viso,Zulma Rodríguez,Neydys Loreto,Yolima Fernández
Investigación Clínica , 2011,
Abstract: En Venezuela como en Canarias (Espa a), la enfermedad cardiovascular es causa importante de morbilidad y de mortalidad. Para estimar el riesgo cardiovascular en adultos de origen canario residentes en Venezuela, reclutamos la cohorte “CDC de Canarias en Venezuela” entre Junio 2.008 y Agosto 2.009. En 452 individuos (54,9% mujeres), entre 18 y 93 a os se realizó una encuesta de datos y se midió su talla, peso, presión arterial, circunferencias de abdomen y cadera; previo ayuno de 12 horas, se determinó glucemia y perfil lipídico. 40,5% de los sujetos era mayor de 65 a os mientras el grupo joven (18-30 a os) era el 8%. En los varones la edad fue 57,69±18,17 a os y el índice de masa corporal 29,39±5,71 Kg/m2; en las mujeres 56,50±16,91 a os y 28,20±5,57 Kg/m2, respectivamente. La prevalencia de síndrome metabólico fue de 49,1%, la suma de sobrepeso y obesidad 75,2%, obesidad abdominal 85,4%, diabetes 17,4%, glucemia alterada en ayunas (GAA) 12,2%, presión arterial elevada 52,9%, HDL-colesterol bajo 53,8% y trigliceridemia elevada 31%. Un tercio de los participantes sin diabetes ni GAA, mostró un índice triglicéridos/HDL-colesterol alto, lo que indica insulino-resistencia. Se concluye que la comunidad de canarios residentes en Venezuela presenta alta prevalencia de factores de riesgo cardiovascular (malnutrición por exceso, obesidad abdominal, dislipemia y diabetes). Respecto a la actual población de Canarias presentan menor frecuencia de GAA y mayor de HDL Colesterol bajo. Respecto a Venezuela presentan menor frecuencia de GAA, de HDL colesterol bajo y de trigliceridemia elevada que los descritos en el estado Zulia. In Venezuela as in the Canary Islands (Spain), cardiovascular disease is a major cause of morbidity and mortality. The purpose of this research is to estimate the cardiovascular risk in the Canary Islands migrants living in Venezuela and participating in the study cohort “CDC of the Canary Islands in Venezuela”. 452 individuals, aged 18 to 93 years (54.9% women), were enrolled between June 2008 and August 2009. A data survey was performed and their weight, height, abdomen and hip circumferences, and blood pressure were measured. After a 12-hour fasting period, a blood sample was obtained for glucose and lipid profile determinations. 40.5% of the subjects were over 65 years of age and 8% corresponded to the younger group (18-30 years). In men, the average age was 57.69±18.17 years and the body mass index 29.39 ± 5.71 kg/m2, whereas women were 56.50±16.91 years and 28.20±5.57 kg/m2, respectively. The prevalence of metabolic syndrome was 49.1%, ov
Química atmosférica en la Gran Sabana I: Composición y fotoquímica de gases inorgánicos y orgánicos
Sanhueza,Eugenio; Fernández,Enmanuel; Donoso,Loreto; Garaboto,Mayantino A.; Alfonzo,Yarima;
Interciencia , 2005,
Abstract: trace gases and photochemical processes were characterized in the atmosphere of la gran sabana, venezuela. compounds from anthropogenic sources (eg. co, so2, benzene, toluene) are in very low concentrations, indicating that the region is pristine. ozone levels frequently showed a decrease of ~0.75ppbv·h-1 starting mid morning. the estimated o3 consumption of 0.15-0.27ppbv·h-1 suggests an additional photochemical consumption of o3 in the boundary layer, promoted by very low no concentrations, in agreement with the measured low levels of hno3. a linear relationship between [o3] and [co] was observed with a do3/dco slope of 0.12v/v, significantly lower than recorded elsewhere, likely due to lower efficiency of o3 production during the oxidation of reactive hydrocarbons. hno3 and nh3 levels are lower than the ones found in other tropical sites, in agreement with the low concentration of nh4+ and no3- aerosols. hcl levels agree with its production from chlorocarbons oxidation, mainly far away. isoprene (emitted by the vegetation) levels are significantly lower that those observed at other tropical sites, showing a relatively low biogenic activity. the diurnal variations of various voc (eg. methanol, isoprene, isoprene oxidation products) indicate an important transport from the guyana esequiba forests. radical production from hcho photolysis (estimated as ~0.17ppbv·h-1) is higher than the one due to o3 photolysis (£0,1ppbv·h-1), showing the importance of formaldehyde in the atmospheric photochemistry of the region. the changes in o3 levels observed during or after a rain event indicate that it promotes a rapid transport of air masses from the residual boundary layer to the nocturnal mixing layer.
COMPUESTOS ORGáNICOS VOLáTILES EN LA ATMóSFERA DE LA GRAN SABANA.: I: CONCENTRACIONES Y QUíMICA ATMOSFéRICA
Sanhueza,Eugenio; Holzinger,Rupert; Donoso,Loreto; Santana,Magaly; Fernández,Enmanuel; Romero,Johnny;
Interciencia , 2001,
Abstract: volatile organic compounds (voc) were measured using proton transfer reaction mass spectrometry (ptr-ms). measurements were mainly made at the estación científica de parupa, from jan 17 to feb 6, 2000. air collected in canisters was used to determine the transept: kavanayén-parupa-luepa-kamá-yuruaní-jaspe-kukenán. co concentrations and meteorological parameters were also measured. the variations of ch3cn and co concentrations indicate that, with the exception of one day, the measurements were practically unaffected by biomass burning and that, in la gran sabana, there is a relatively homogeneous concentration of these intermediate lifetime compounds (ch3cn 0.15 ppbv; co 50 ppbv). the aromatic hydrocarbons show extremely low concentrations (e.g., benzene 0.038 ppbv, toluene 0.018 ppbv), clearly showing the pristine conditions of the region. in the case of isoprene, increasing concentrations were observed throughout the day, with very low levels at dawn, ~0.49 ppbv at noon, and maximum concentrations (~0.8 ppbv) around 19:00. this is consistent with a poor emission from local vegetation and a significant emission from upwind forests. the isoprene oxidation products (e.g., mvk+macr) follow similar features. the presence of a significant amount of isoprene hydroperoxide (0.08 ppbv) suggests that the isoprene oxidation should occur under very low levels of no. relatively high levels of methanol (1.54 ppbv), acetone (1.49 ppvb), acetaldehyde (0.85 ppbv), formic acid (~2 ppbv) and acetic acid (~1 ppbv) were recorded, which are explained considering their natural production and their corresponding atmospheric lifetime. it is concluded that: i) voc concentration variations are basically due to interactions between the biosphere and the atmosphere. ii) there is a significant transport of voc (e.g., isoprene, methanol) from the guayana esequiba forests. iii) formic and acetic acids should play a significant role in the basic-acid equilibrium of the la gran sabana ecosystems. i
CARACTERIZACIóN DE LESIONES HEPáTICAS SóLIDAS CON TéCNICA DE DIFUSIóN POR RESONANCIA MAGNéTICA: REPORTE PRELIMINAR
Vergara Del Río,María Loreto; Fernández A,Manuel; Pereira B,Rodrigo;
Revista chilena de radiología , 2010, DOI: 10.4067/S0717-93082010000100003
Abstract: the characterization of liver lesions in mri is based on morphology, behavior in the various sequences, and with paramagnetic contrast. objective: to evaluate the diffusion behavior of various solid lesions, measuring adc to determine its usefulness. between 2007 and 2008 we studied 51 solid focal lesions (26 patients) with mri, using conventional sequences and diffusion-weighted imaging obtained with epi mode with different values of "b". lesions corresponded to 20 hemangiomas, 12 focal nodular hyperplasia (fnh), 5 hepatocellular carcinoma (hcc), and 14 metastases. the statistical analysis allowed us to determine optimal cutoff level (adc 1.28 x 1cr3mm2/s) to differentiate benign from malignant lesions. adc values of benign lesions were significantly higher than those of the malignant ones; the hemangioma was the solid lesion with higher adc values, followed by fnh, hcc and metastases, with lower values. registered mean values were 1.68, 1.30, 1.08 and 1.03 (x10-3mrrf/s), respectively. in our view, the diffusion-weighted technique should be used to supplement conventional mri for proper characterization of solid liver lesions.
CARACTERIZACIóN DE LESIONES HEPáTICAS SóLIDAS CON TéCNICA DE DIFUSIóN POR RESONANCIA MAGNéTICA: REPORTE PRELIMINAR CHARACTERIZATION OF SOLID LIVER LESIONS WITH DIFFUSION-WEIGHTED MRI TECHNIQUE
María Loreto Vergara Del Río,Manuel Fernández A,Rodrigo Pereira B
Revista Chilena de Radiología , 2010,
Abstract: La caracterización de las lesiones hepáticas en resonancia magnética se basa en: morfología, comportamiento en las diversas secuencias y con el contraste paramagnético. Objetivo: evaluar el comportamiento en difusión de diversas lesiones sólidas, midiendo ADC para determinar su utilidad. En los a os 2007-2008, se estudiaron 51 lesiones focales sólidas (26 pacientes) con resonancia magnética, utilizando secuencias convencionales y difusión, que fue adquirida con modalidad EPI con diferentes valores de "b". Las lesiones correspondieron a: 20 hemangiomas, 12 hiperplasias nodulares focales (HNF), 5 hepatocarcinomas (HCC) y 14 metástasis. El análisis estadístico permitió determinar nivel de corte óptimo (ADC 1.28x10'3mrrf/s) para diferenciar lesiones benignas de malignas. Los valores ADC de lesiones benignas fueron significativamente mayores que los de las malignas; el hemangioma fue la lesión sólida con mayor ADC, seguido por HNF, HCC y metástasis, con valores menores. Los valores medios encontrados fueron de 1.68, 1.30, 1.08 y 1.03 (x103mm2/s) respectivamente. En nuestra opinión, la técnica de difusión debe utilizarse como complemento de resonancia magnética convencional, para una adecuada caracterización de lesiones sólidas hepáticas. The characterization of liver lesions in MRI is based on morphology, behavior in the various sequences, and with paramagnetic contrast. Objective: To evaluate the diffusion behavior of various solid lesions, measuring ADC to determine its usefulness. Between 2007 and 2008 we studied 51 solid focal lesions (26 patients) with MRI, using conventional sequences and diffusion-weighted imaging obtained with EPI mode with different values of "b". Lesions corresponded to 20 hemangiomas, 12 focal nodular hyperplasia (FNH), 5 hepatocellular carcinoma (HCC), and 14 metastases. The statistical analysis allowed us to determine optimal cutoff level (ADC 1.28 x 1Cr3mm2/s) to differentiate benign from malignant lesions. ADC values of benign lesions were significantly higher than those of the malignant ones; the hemangioma was the solid lesion with higher ADC values, followed by FNH, HCC and metastases, with lower values. Registered mean values were 1.68, 1.30, 1.08 and 1.03 (x10-3mrrf/s), respectively. In our view, the diffusion-weighted technique should be used to supplement conventional MRI for proper characterization of solid liver lesions.
Patient State Index Detects Changes in Cerebral Blood Flow and May Predict New Ischemic Lesions during Carotid Stenting—Case Report  [PDF]
Ana B. Fernández
Open Journal of Anesthesiology (OJAnes) , 2015, DOI: 10.4236/ojanes.2015.51004
Abstract: Carotid angioplasty and stenting (CAS) was developed to be a less invasive and complex procedure compared to carotid endarterectomy (CEA). It has emerged as an alternative for patients who are considered to have high surgical risks due to medical comorbidities or anatomical high-risk features [1]. The procedure is usually done under local anesthesia with light sedation, with the subsequent expectation of less neurologic injury, venous thromboembolisms, and myocardial infarctions—all well-known clinical risks of undergoing surgical procedures under general anesthesia. CAS, however, carries some increased risks of arterial dissection, dislocation of atherothrombotic debris and embolization to the brain or eye, late embolization due to thrombus formation on the damaged plaque, and bradycardia and hypotension as a result of carotid sinus stimulation. Electroencephalography can detect cerebral ischemia and hypoxia along with measuring hypnotic effects, but has not been reported to be used during CAS to signal impending neurological deficit and allow for intervention to prevent stroke. We report on the use of patient state index (PSI), an electroencephalographic (EEG) derived variable used by SEDLine monitor (Masimo Inc., San Diego, CA) to monitor changes in cerebral blood flow during carotid angioplasty and stenting in an awake patient under local anesthesia. PSI was developed to measure the level of hypnosis and sedation during anesthesia and in the ICU. The PSI is based on quantitative electroencephalogram features, recorded from anterior and posterior scalp sites, as input to a multivariate algorithm that quantifies the most probable level of anesthesia or sedation. The PSI is reported as a range from 0 to 100, with decreasing values indicating increasing levels of anesthesia or sedation. Adequate depth of anesthesia is reflected by PSI value of 25 - 50, and a fully awake state by a PSI of 100 [2]. Other EEG analysis techniques have been explored to detect changes in cerebral blood flow during carotid surgery [3], such as entropy described by Khan and Ozcan in his recent work entitled Disagreement in Bilateral State Entropy Values in Carotid Artery Disease [4], but there are no previous reports of the use of PSI during procedural sedation in carotid angioplasty and stenting in an awake patient.
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