ON THE DARK SIDE OF LEARNING CALCULUS: EVIDENCE FROM AGRIBUSINESS STUDENTS

This study focused on evaluating the agribusiness students negative experiences in learning Calculus. The study employed 121 agribusiness students in the first semester of school year 2019-2020 in Visayas State University, Baybay City, Leyte, Philippines. A selected secondary data from the study of Casinillo and Casinillo (2020a) was utilized in this study. With the aid of correlational research approach, this study stresses to explain the nature and characteristics of negative effects of learning calculus which is very helpful for improving the level of achievement of students and modifying the strategy of mathematics teachers. Results showed that most of the agribusiness students dont have enough background in pre-calculus topics since there are only 9% of them took a STEM strand during senior high school. Seemingly, it is revealed that students are experiencing extreme stress, natural emotional exhaustion and frustration, and average absenteeism, somatic burden and laziness in learning Calculus. It is found out that the negative experiences of these agribusiness students are significantly related to each other. This suggest that these negative experiences are inter-correlated and dependent to each other which is wearisome to their studies and leads to poor academic performance. However, these students are driven to pursue studying calculus since its part to their requirements in their degree program. Hence, by proper motivation and appropriate teaching strategy in Calculus, these students can progress their level of achievement

JOB BURNOUT AND SATISFACTION AMONG SECONDARY TEACHERS: REGRESSION AND K-MEANS CLUSTERING ANALYSIS

Burnout on a teaching job refers to exhaustion that leads to depression which can affect the teacher’s well-being and satisfaction. This article looks into the level of job burnout and satisfaction of high school teachers during modular distance learning and determines its association at different levels. Cross-sectional primary data were gathered from a random sample of secondary teachers in Ormoc City, Leyte, Philippines. The gathered data were job burnout and satisfaction scores and described using standard statistical metrics. Moreover, correlation and regression analysis were employed to analyze its association, and K-means clustering was used to identify homogeneous categories of job burnout and satisfaction scores with similar characteristics. On average, results showed that the high school teachers were still  “satisfied” despite the “high burnout” they were facing during the modular distance learning amid the pandemic. Using the correlation analysis, it is revealed that teachers’ satisfaction and burnout are significantly and inversely correlated to each other. This implies that the burnout level adversely affects the satisfaction in teaching. Based on regression analysis, there is a decrease of 0.653 units in the satisfaction perception score for every 1 unit increase in the burnout perception score and it is significant at a 1% level. It is depicted in K-means clustering that teachers’ satisfaction and burnout levels are compact and converge to the interpretation that they were highly burnout yet satisfied in modular distance learning. Hence, the study suggests that teachers' tasks during distance education must be lessened to increase their well-being as educators

Clinical, Laboratory and Lung Ultrasound Assessment of Congestion in Patients with Acute Heart Failure

Congestion is the main cause of hospitalization in patients with acute heart failure (AHF), however its precise assessment by simple clinical evaluation remains elusive. The recent introduction of the lung ultrasound scan (LUS) allowed to physicians to more precisely quantify pulmonary congestion. The aim of this study was to compare clinical congestion (CC) with LUS and B-type natriuretic peptide (BNP) in order to achieve a more complete evaluation and to evaluate the prognostic power of each measurement. Methods: All patients were submitted to clinical evaluation for blood sample analysis and LUS at admission and before discharge. LUS protocol evaluated the number of B-lines for each chest zone by standardized eight site protocol. CC was measured following ESC criteria. The mean difference between admission and discharge congestion logBNP and B-lines values were calculated. Combined end points of death and rehospitalization was calculated over 180 days. Results: 213 patients were included in the protocol; 133 experienced heart failure with reduced ejection fraction (HFrEF), and 83 presented with heart failure with preserved ejection fraction (HFpEF). Patients with HFrEF had a more increased level of BNP (1150 (812-1790) vs. 851 (694-1196); p = 0.002) and B lines total number (32 (27-38) vs. 30 (25-36); p = 0.05). A positive correlation was found between log BNP and Blines number in both HFrEF (r = 0.57; p < 0.001) and HFpEF (r = 0.36; p = 0.001). Similarly, dividing B-lines among tertiles the upper group (B-lines >= 36) had an increased clinical congestion score. Among three variables at admission only B-lines were predictive for outcome (AUC 0.68 p < 0.001) but not LogBNP and CC score. During 180 days of follow-up, univariate analysis showed that persistent Delta B-lines <-32.3% (HR 6.54 (4.19-10.20); p < 0.001), persistent Delta BNP < -43.8% (HR 2.48 (1.69-3.63); p < 0.001) and persistent Delta CC < 50% (HR 4.25 (2.90-6.21); p < 0.001) were all significantly related to adverse outcome. Multivariable analysis confirmed that persistent Delta B-lines (HR 4.38 (2.64-7.29); p < 0.001), Delta BNP (HR 1.74 (1.11-2.74); p = 0.016) and Delta CC (HR 3.38 (2.10-5.44); p < 0.001 were associated with the combined end point. Conclusions: a complete clinical laboratory and LUS assessment better recognized different congestion occurrence in AHF. The difference between admission and discharge B-lines provides useful prognostic information compared to traditional clinical evaluation. © 2022 by the authors. Licensee MDPI, Basel, Switzerland

Disrupción auriculoventricular posterior a reoperación de reemplazo valvular mitral: reparación y evaluación ecocardiográfica

ResumenLa disrupción auriculoventricular después del reemplazo valvular mitral es una rara pero letal complicación. Este caso es el de una mujer de 72 años de edad, con antecedentes de: reemplazo valvular aórtico, mitral, plastia tricúspide y Maze. Se llevó al reemplazo valvular mitral con prótesis Hancock 29 mitral. Se trasladó a la UCI y el curso postoperatorio fue normal hasta las 24 horas después de la cirugía, cuando presentó disnea y requirió soporte inotrópico. Se le realizó un angiotac y un ecocardiograma transtorácico que evidenció pseudoaneurisma ventricular. Fue llevada a cirugía, se inició circulación extracorpórea. Se evidenció disrupción auriculoventricular en el anillo posterior de la válvula mitral (tipo I perforación). La ruptura fue cerrada con un parche mixto de pericardio bovino y dacron con sutura continua. Actualmente, la paciente está en buenas condiciones sin recurrencia. Investigamos: el caso, la etiología, el reparo quirúrgico y la prevención de esta rara complicación y se discute.AbstractAtrioventricular disruption after a mitral valve replacement is a rare but fatal complication. A case of 72 year-old woman is presented. She had a medical history of aortic and mitral valve replacement and Maze and tricuspid valve surgery. Mitral valve replacement was performed with Hancock 29 mitral prosthesis. She was taken to ICU and postoperative progress was normal until 24hours after the surgery, when she developed dyspnea and required inotropic support. A CT angiography and transthoracic echocardiogram were performed, which evidence a ventricular pseudoaneurysm. She was taken to the operating room to start extracorporeal circulation. Atrioventricular disruption was evidenced in the posterior mitral annulus (type I perforation). Rupture was closed with a using a mixed Dacron and bovine pericardial patch with continuous suture. Patient is currently in good condition with no recurrence. Case, etiology, surgical repair and prevention of this rare complication were investigated and discussed

Lealtad a la práctica deportiva: Una aplicación de la TPB a los servicios públicos para la práctica deportiva

The Theory of Planned Behavior (TPB) has been used in multiple industries and markets to explain the behavior of individuals. In the Colombian sports sector has never been used as a tool to model the behavior of individuals loyal to the sports offered by public institutions.In this study, the TPB model is proposed as a hypothesis to explain the history of loyalty to the sport, an empirical sample of 411 users of the programs of sport and physical activity INDERE (La Estrella, Antioquia) is collected, run a confirmatory factor analysis to ensure the reliability and validity of the measurement model and the hypotheses are tested by structural equation modeling.The study showed that TPB provides a good fit to model the behavior of loyalty to the sport and concluded that Perceived Control is the main antecedent of loyalty to sports such programs.La Teoría del Comportamiento Planificado (TPB) ha sido utilizada en múltiples sectores y mercados para explicar el comportamiento de los individuos. En el sector deportivo colombiano nunca se ha utilizado como herramienta para modelar el comportamiento de lealtad de los individuos hacia la práctica deportiva ofertada por las instituciones públicas.En el presente estudio se propone la TPB como modelo de hipótesis para explicar los antecedentes de la lealtad hacia la práctica deportica, se recoge una muestra empírica de 411 usuarios de los programas de deporte y actividad física del INDERE (La Estrella, Antioquia), se ejecuta un Análisis Factorial Confirmatorio para garantizar la fiabilidad y validez del modelo de medida y se contrastan las hipótesis mediante ecuaciones estructurales.El estudio evidencia que la TPB provee un buen ajuste para modelar el comportamiento de lealtad a la práctica deportiva y concluye que el Control Percibido es el principal antecedente de la lealtad a la práctica deportiva de dichos programas

Source model of the 2007 M_w 8.0 Pisco, Peru earthquake: Implications for seismogenic behavior of subduction megathrusts

We use Interferometric Synthetic Aperture Radar, teleseismic body waves, tsunami waveforms recorded by tsunameters, field observations of coastal uplift, subsidence, and runup to develop and test a refined model of the spatiotemporal history of slip during the M_w 8.0 Pisco earthquake of 15 August 2007. Our preferred solution shows two distinct patches of high slip. One patch is located near the epicenter while another larger patch ruptured 60 km further south, at the latitude of the Paracas peninsula. Slip on the second patch started 60 s after slip initiated on the first patch. We observed a remarkable anticorrelation between the coseismic slip distribution and the aftershock distribution determined from the Peruvian seismic network. The proposed source model is compatible with regional runup measurements and open ocean tsunami records. From the latter data set, we identified the 12 min timing error of the tsunami forecast system as being due to a mislocation of the source, caused by the use of only one tsunameter located in a nonoptimal azimuth. The comparison of our source model with the tsunami observations validate that the rupture did not extend to the trench and confirms that the Pisco event is not a tsunami earthquake despite its low apparent rupture velocity (<1.5 km/s). We favor the interpretation that the earthquake consists of two subevents, each with a conventional rupture velocity (2–4 km/s). The delay between the two subevents might reflect the time for the second shock to nucleate or, alternatively, the time it took for afterslip to increase the stress level on the second asperity to a level necessary for static triggering. The source model predicts uplift offshore and subsidence on land with the pivot line following closely the coastline. This pattern is consistent with our observation of very small vertical displacement along the shoreline when we visited the epicentral area in the days following the event. This earthquake represents, to our knowledge, one of the best examples of a link between the geomorphology of the coastline and the pattern of surface deformation induced by large interplate ruptures

Aceitacào do e-commerce na Colombia: um estudo para a cidade de Medellín

E-Commerce is an increasing phenomenon in Latin America and Colombia, that is why, its technological acceptance is very important academically and for business. The objective of this article is to identify the e-commerce use background in Colombia. Technological Acceptance Model (TAM) is complemented in this study with constructs of confidence and perceived security to propose an adjusted model for Colombian case. This model is empirically contrasted with a consumers sample from Medellín. It is evident the importance of confidence and perceived benefit as direct background of the intention of using e-Commerce, and the ease of use and perceived security as indirect background. Results fill gaps in literature on e-commerce in Colombia and allow identifying relevant business implications for commercial activities development through the internet.El e-Commerce es un fenómeno creciente en Latinoamérica y Colombia por lo que el estudio de su aceptación tecnológica es de alta importancia académica y empresarial. El objetivo de este artículo es identificar los antecedentes de la intención de uso de e-Commerce en Colombia. El Modelo de Aceptación Tecnológica (TAM), es complementado en este estudio con los constructos de Confianza y Seguridad Percibida para proponer un modelo ajustado al caso colombiano. Dicho modelo es contrastado empíricamente con una muestra de consumidores de la ciudad de Medellín. Se evidencia la importancia de la confianza y la utilidad percibida como antecedentes directos de la intención de uso del e-Commerce. Los resultados llenan vacíos existentes en la literatura sobre el e-Commerce en Colombia y permiten identificar implicaciones empresariales relevantes para el desarrollo de actividades comerciales a través de la InternetO e-Commerce é um fenómeno crescente na América Latina e na Colombia. Por isto o estudo da sua aceitagáo tecnológica é de alta importancia académica e empresarial. O objetivo deste artigo é identificar os antecedentes da intengáo de uso de e-Commerce na Colombia. O Modelo de Aceitagáo Tecnológica (TAM) é complementado neste estudo pelos constructos de Confianga e Seguranga Percebida com o fim de propor um modelo adequado ao caso colombiano. Referido modelo é contrastado empiricamente com uma mostra de consumidores da cidade de Medellín. Com isto se evidencia a importancia da confianga e da utilidade percebida como antecedentes diretos da intengáo do uso do e-Commerce, e a facilidade do uso e da seguranga percebida como antecedentes indiretos. Os resultados preenchem vazios existentes na literatura sobre o e-Commerce na Colombia e permitem identificar envolvimentos empresariais relevantes para o desenvolvimento de atividades comerciais através da Internet

MEDIDAS DE BIOSEGURIDAD DURANTE LA CONFECCION DE MODELOS DENTALES Y PERCEPCIÓN DE RIESGO EN ESTUDIANTES DE ODONTOLOGÍA

Objetivo: Relacionar las medidas de bioseguridad durante la confección de modelos dentales y la percepción de riesgo en estudiantes de odontología de la “Universidad Andina Néstor Cáceres Velásquez”. Materiales y métodos: Investigación analítica, transversal, prospectivo y observacional se aplicó a 60 estudiantes clínicos, seleccionados según criterios de selección muestreo no probabilístico, se aplicó las técnicas de observación y entrevista, mediante una ficha de observación y cuestionario con la escala de Likert, ambas validadas por juicio de expertos. Se contrasto la hipótesis con la prueba de chi cuadrado fue obtenida mediante el uso del programa estadístico SPSS versión 23, con significancia 0.05. Resultados: de 60 clínicos: el 46.60% percibió riesgo alto y ninguno aplico de forma aplicaron en forma regular, y el 23.30% clínicos aplicaron de forma adecuada las conductas esenciales de bioseguridad. Conclusión: la percepción de riesgo se relaciona altamente significativa con las conductas esenciales de bioseguridad durante la confección de los modelos dentales (p=0.0

Lower Aptian ammonite and carbon isotope stratigraphy in the eastern Prebetic Domain (Betic Cordillera, southeastern Spain)

Major global palaeobiologic and palaeoenvironmental changes occurred during the Early Aptian. Precise dating and timing of the different events is crucial to determine possible cause-effect relationships between them. In this regard, the combination of biostratigraphic and chemostratigraphic data can provide a very useful tool for time control. So far attempts to correlate the Lower Aptian carbon isotope record and the ammonite zonation yielded contradictory conclusions. In this paper, we present the results of an integrated analysis of the ammonite stratigraphic distribution and highresolution carbon isotope profiles from Lower Aptian sections of the eastern Prebetic Domain (Betic Cordillera, southeastern Spain). We recognized, in ascending order, the Deshayesites oglanlensis, Deshayesites forbesi, Deshayesites deshayesi, and Dufrenoyia furcata Zones. This succession is the same as that recently identified in the eastern Iberian Chain, and it closely correlates with both standard Mediterranean and Boreal zonations. The carbon isotope record displays the trends globally recognized for the Early Aptian, with two long positive shifts separated by a pronounced negative excursion. Calibration of this isotopic record with the ammonite zonation shows that the age of OAE 1a, which corresponds to the negative excursion and subsequent positive shift, is constrained to the middle/upper part of the Deshayesites forbesi Zone