Formas para cargar eléctricamente un cuerpo

Video educativo interactivo que muestra los diferentes procesos de carga eléctrica de un cuerpo y evalúa los conocimientos del usuari

Latin American perspectives and the IT2017 curricular guidelines

The term information technology has many meanings for various stakeholders and continues to evolve. This discussion presents an overview of the developing curricular guidelines for rigorous, high quality, bachelor\u27s degree programs in information technology (IT), called IT2017. Panel participants will focus on Latin American academic and industry perspectives on IT undergraduate education. Discussion will seek to ascertain commonalities and differences between the current draft IT2017 report and perspectives from Latino/a professional and academic communities. It also addresses ways in which this endeavor contrasts with current practices in Latin America industry and academia

Assessing automatic data processing algorithms for RGB-D cameras to predict fruit size and weight in apples

Data acquired using an RGB-D Azure Kinect DK camera were used to assess different automatic algorithms to estimate the size, and predict the weight of non-occluded and occluded apples. The programming of the algorithms included: (i) the extraction of images of regions of interest (ROI) using manual delimitation of bounding boxes or binary masks; (ii) estimating the lengths of the major and minor geometric axes for the purpose of apple sizing; and (iii) predicting the final weight by allometric modelling. In addition to the use of bounding boxes, the algorithms also allowed other post-mask settings (circles, ellipses and rotated rectangles) to be implemented, and different depth options (distance between the RGB-D camera and the fruits detected) for subsequent sizing through the application of the thin lens theory. Both linear and nonlinear allometric models demonstrated the ability to predict apple weight with a high degree of accuracy (R2 greater than 0.942 and RMSE < 16 g). With respect to non-occluded apples, the best weight predictions were achieved using a linear allometric model including both the major and minor axes of the apples as predictors. The mean absolute percentage error (MAPE) ranged from 5.1% to 5.7% with respective RMSE of 11.09 g and 13.02 g, depending to whether circles, ellipses, or bounding boxes were used to adjust fruit shape. The results were therefore promising and open up the possibility of implementing reliable in-field apple measurements in real time. Importantly, final weight prediction error and intermediate size estimation errors (from sizing algorithms) interact but in a way that is not easily quantifiable when weight allometric models with implicit prediction error are used. In addition, allometric models should be reviewed when applied to other apple cultivars, fruit development stages or even for different fruit growth conditions depending on canopy management.This work was partly funded by the Department of Research and Universities of the Generalitat de Catalunya (grants 2017, SGR 646 and 2021 LLAV 00088), by the Spanish Ministry of Science and Innovation / AEI/10.13039/501100011033 / ERDF (grants RTI2018-094222-B-I00 [PAgFRUIT project], PID2021-126648OB-I00 [PAgPROTECT project]) and by the Spanish Ministry of Science and Innovation / AEI/10.13039/501100011033 / European Union NextGeneration / PRTR (grantTED2021-131871B-I00 [DIGIFRUIT project]). We would also like to thank the Secretariat of Universities and Research of the Department of Business and Knowledge of the Generalitat de Catalunya and the European Social Fund (ESF) for financing Juan Carlos Miranda’s pre-doctoral fellowship (2020 FI_B 00586). The work of Jordi Gené-Mola was supported by the Spanish Ministry of Universities through a Margarita Salas postdoctoral grant funded by the European Union - NextGenerationEU.info:eu-repo/semantics/publishedVersio

LAS “LLAVES” PARA FORMAR UN MEJOR INGENIERO AGRONOMO.

La sociedad valora a aquellos profesionales que hacen aportes para la solución de sus problemas. El saber “hacer cosas” y hacerlas bien dignifica la profesión, eleva la autoestima y la autoconfianza de los profesionales. Este trabajo refleja un estudio retrospectivo de 25 años de docencia en donde he buscado la excelencia en la docencia, tratando de enseñar – haciendo para formar profesionales que la sociedad requiere, con la optimización de recursos, adaptación a los cambios emergentes, y satisfacer las necesidades de los productores de grandes especies y agricultores pequeños y grandes. Por lo que propongo ¨llaves¨ para la reflexión

In vitro Evaluation of Trimethoprim and Sulfamethoxazole from Fixed-Dose Combination Generic Drugs using Spectrophotometry: Comparison of Flow-Through Cell and USP Paddle Methods

Purpose: To develop a first-order derivative spectrophotometric method for the determination of trimethoprim (TMP) and sulfamethoxazole (SMX) from fixed-dose combination generic products using a flow-through cell technique.Methods: Absorbance measurement was achieved at 247.8 and 257.9 nm for trimethoprim and sulfamethoxazole, respectively. USP Apparatus 4 with 22.6 mm cells, laminar flow at 16 ml/min, and 0.1 N HCl at 37 °C as dissolution medium, were used. Dissolution profiles were compared with modeldependent and independent methods.Results: All the products met the pharmacopeial dissolution criterion (Q ≥ 70 %, at 60 min), except SMX in two products (SC 400 mg and SB1 800 mg) using the flow-through cell (53.62 and 49.74 % dissolved, respectively). Using both USP apparatuses, significant differences in mean dissolution time and dissolution efficiency values were found (p &lt; 0.05). All products were in line with Weibull’s kinetics and significant differences in derived parameters (Td) values were found (p &lt; 0.05).Conclusion: Determination of TMP and SMX by derivative spectrophotometry can easily be employed for dissolution studies using the flow-through cell technique. However, it would be necessary to determine correlation with in-vivo test results in order to assure safe interchangeability.Keywords: Trimethoprim, Sulfamethoxazole, Flow-through cell method, First-order derivative spectrophotometry, Fixed-dose combination generic drug

Validación de una escala para evaluar la adicción a Internet

La definición del uso prolongado de Internet como una adicción no es clara. Se han utilizado diversas estrategias en un intento de recuperar datos empíricos que permitan suponer este uso como una adicción. Destaca el diseño de instrumentos de evaluación para la adicción a Internet. Sin embargo, existen pocos instrumentos confiables y válidos que permitan su evaluación. El propósito del presente estudio fue desarrollar un instrumento que permita medir la adicción a Internet, el cual integra los parámetros de la adicción a sustancias junto con los parámetros de adicción conductual. Se utilizó una escala Likert con 29 ítems y se aplicó a 128 estudiantes universitarios que cum-plieron con los criterios establecidos. Los resultados indicaron la presencia de 6 factores que contienen un total de 26 ítems y que lograron explicar el 69.47% de la varianza total. Además, el instrumento en general obtuvo una con-sistencia interna aceptable con un alfa de Cronbach de 0.917. De las variables cuyos pesos factoriales cargaron de forma importante, se obtuvieron alfas que van desde 0.86 para el primer factor a 0.64 para el sexto factor. Se sugiere que el instrumento es una opción válida y confiable que permitirá evaluar el uso adictivo de InternetThe definition of prolonged Internet use as an addiction is unclear. Various strategies have been used to recover empirical data that allow us to consider this use as an addiction. The design of assessment instruments for Internet addiction stands out. However, there are few reliable and valid instruments that allow its evaluation. The purpose of this study was to develop an instrument to measure Internet addiction, which integrates the parameters of subs-tance addiction together with the parameters of behavioral addiction. A Likert scale with 29 items was used and it was applied to 128 university students who met the established criteria. The results indicated the presence of 6 factors that contain a total of 26 items and that managed to explain 69.47% of the total variance. In addition, the instrument in general obtained an acceptable internal consistency with a Cronbach’s alpha of 0.917. Of the variables whose factorial weights loaded significantly, alphas ranging from 0.86 for the first factor to 0.64 for the sixth factor were obtained. It is suggested that the instrument is a valid and reliable option that will allow evaluating addictive use of the Internet

The intracellular accumulation of polymeric neuroserpin explains the severity of the dementia FENIB

Familial encephalopathy with neuroserpin inclusion bodies (FENIB) is an autosomal dominant dementia that is characterized by the retention of polymers of neuroserpin as inclusions within the endoplasmic reticulum (ER) of neurons. We have developed monoclonal antibodies that detect polymerized neuroserpin and have used COS-7 cells, stably transfected PC12 cell lines and transgenic Drosophila melanogaster to characterize the cellular handling of all four mutant forms of neuroserpin that cause FENIB. We show a direct correlation between the severity of the disease-causing mutation and the accumulation of neuroserpin polymers in cell and fly models of the disease. Moreover, mutant neuroserpin causes locomotor deficits in the fly allowing us to demonstrate a direct link between polymer accumulation and neuronal toxicity

Fluid therapy in neurotrauma: basic and clinical concepts

The patient with head trauma is a challenge for the emergency physician and for the neurosurgeon. Currently traumatic brain injury constitutes a public health problem. Knowledge of the various therapeutic strategies to provide support in the prehospital and perioperative are essential for optimal care. Rapid infusion of large volumes of crystalloids to restore blood volume and blood pressure quickly is now the standard treatment for patients with combined TBI and HS The fluid in patients with brain and especially in the carrier of brain injury is a critical topic; we present a review of the literature about the history, physiology of current fluid preparations, and a discussion regard the use of fluid therapy in traumatic brain injury and decompressive craniectomy

A stacking-fault based microscopic model for platelets in diamond

We propose a new microscopic model for the $\{001\}$ planar defects in diamond commonly called platelets. This model is based on the formation of a metastable stacking fault, which can occur because of the ability of carbon to stabilize in different bonding configurations. In our model the core of the planar defect is basically a double layer of three-fold coordinated $sp^2$ carbon atoms embedded in the common $sp^3$ diamond structure. The properties of the model were determined using {\it ab initio} total energy calculations. All significant experimental signatures attributed to the platelets, namely, the lattice displacement along the $[001]$ direction, the asymmetry between the $[110]$ and the $[1\bar{1}0]$ directions, the infrared absorption peak $B^\prime$, and broad luminescence lines that indicate the introduction of levels in the band gap, are naturally accounted for in our model. The model is also very appealing from the point of view of kinetics, since naturally occurring shearing processes will lead to the formation of the metastable fault.Comment: 5 pages, 4 figures. Submitted for publication on August 2nd, 200