Gestión de compras y calidad de servicio en los colaboradores de una empresa de publicidad de Trujillo, 2022

La presente investigación tuvo por objetivo determinar la relación entre la gestión de compras y la calidad de servicio en los colaboradores de una empresa de publicidad de Trujillo, 2022. La metodología que se utilizó fue aplicada, nivel descriptivo, enfoque cuantitativo, diseño no experimental transversal correlacional, la muestra fue de tipo censal y estuvo conformada por 25 colaboradores de la empresa. Se utilizó como técnica la encuesta y como instrumento el cuestionario uno para cada variable; los resultados revelaron que el 60% de los colaboradores indican que la gestión de compra de la empresa tiene un nivel medio y que el 68% de los colaboradores califican la calidad de servicio de la empresa en un nivel medio; así mismo se determinó una correlación altamente significativa directa moderada entre ambas variables con una significancia da 0,004 y su coeficiente de Pearson es p= 0,560. Se concluye que, con una mayor gestión de compra, se elevará la calidad de servicio que se le brinda a los consumidores de la empresa

A Zugunruhe Data Collection System Using Passive Infrared Sensors

When engineers and biologists work together, there is a lot to learn on both sides. For instance, our work introduced us to zugunruhe, which is a German word that means “unrest”. It is used in the context of migratory birds, as they become restless at night, inside their cages, during their migratory period. When does zugunruhe start? It usually starts when the weather becomes cold and the days shorter, but it varies for different bird species. Moreover, global warming has caused changes in zungunruhe’s timing, which made it even harder to predict. Another question is about genetics: is there a specific gene or a group of genes that cause birds to migrate? To help scientists answer questions related to zugunruhe and the genes underlying migratory behavior, this paper presents the design and implementation of a zugunruhe data collection system to study the Swainson’s thrush, a migratory songbird that breeds in North America. Our goal is to share how custom-off-the-shelf (COTS) devices and existing technologies were used in this project, such as passive infrared motion sensors, telecom cables, custom printed circuit boards (PCB) and a data acquisition system using LabView software. All these were combined to monitor bird movements. We also discuss how the learned lessons from our first winter of data collection, in which we monitored 30 bird cages, led to improvements to scale the system to support the monitoring of 60 birds in the second year. Samples of the collected data are presented to show that the system works, which was validated by comparing our data with the images obtained using an infrared camera. Some of the challenges on maintaining the system are also discussed. Moreover, this paper provides an example of an interdisciplinary, applied research project that is still on-going, and it was created by a group of undergraduate students. We hope it can inspire other researchers and undergraduate students to get involved in interdisciplinary research

Effects of the COVID-19 Pandemic on Physical Activity in Children: A Systematic Rapid Review

Background: Prolonged lockdowns, put in place to mitigate the spread of COVID-19, may have altered physical activity (PA). The goal of this systematic rapid review was to synthesize the global impact of the COVID-19 pandemic on PA of children. Methods: Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) guidelines were used to conduct a database search on 03/29/2021. Included studies were peer- reviewed, in English language, and encompassed both a measure of PA during the COVID-19 pandemic and PA data for children aged 18 and younger. The database search yielded 677 unique citations and, ultimately, 69 articles were included in the review. Results: During the COVID-19 pandemic, frequently reported PA included walking, unstructured play, and virtual PA through online platforms. Of the articles that reported changes in PA of children during the COVID-19 pandemic, 89% reported PA (e.g., frequency, intensity, duration, or the percentage of children who met PA recommendations) of children decreased. Boys, younger children, children who lived with other children, and children with more outdoor play space had higher levels of PA. Conclusions: The COVID-19 pandemic resulted in decreased PA among children around the world. Further work is needed to develop policies to support global PA increases

Generación de Electricidad Microbiana con diferentes matrices orgánicas mediante celdas de combustibles.

Se implementó Celdas de Combustible Microbiano (CCMs) para generar energía bioeléctrica. Las celdas fueron alimentadas con suelo de la Comunidad de Pichán Central de la provincia de Chimborazo y residuos orgánicos en proporciones de peso entre verduras y frutas en tres diferentes matrices orgánicas M1; M2; M3, con un peso total de la matriz orgánica de 1000 g. Para la implementación de CCMs se configuró el compartimento anódico compuesto por la matriz orgánica y suelo donde se colocó el electrodo de fibra de carbono conectado a un circuito externo, continuamente se conformó el espacio correspondiente a la Membrana de Intercambio de Protones (MIP) con una nueva proporción de suelo y carbón activado sobre esta y se colocó el electrodo cátodo para formar el circuito de las CCMs. Para monitorear el pH anódico, temperatura interna y voltaje (mV) se instaló sensores para cada CCM durante 60 días de monitoreo. El análisis microbiológico determinó Unidades Formadoras de Colonias (UFC) para cada una de las CCMs, estableciéndose una correlación inversa del número de UFCs con la generación de bioelectricidad. El análisis bromatológico presentó porcentajes similares en M1 y M3 de extracto libre de nitrógeno que asocia a compuestos de carbohidratos; M2 determinó presencia de celulosa ya que contenía mayor cantidad de verduras. La prueba de ANOVA para producción de bioelectricidad indicó un comportamiento similar en las CCM1 y CCM3, mientras que la producción de bioelectricidad de la CCM2 difiere significativamente. Indicando mejor desempeño en la producción de bioelectricidad en CCM1 y CCM3. Sin embargo, para identificar el conglomerado de microorganismos que muestre mejor respuesta bioeléctrica es necesario trabajar con técnicas moleculares.Microbial Fuel Cells (MFCs) were implemented to generate bioelectric energy. The cells were fed with soils from Central Pichán Community in the province of Chimborazo and organic waste in weight ratios between vegetables and fruit in three different organic matrices M1; M2; M3, with a total organic matrix weight of 1000 g. For the implementation of MFCs, the anode compartment was configured, which comprises the organic matrix and the soil where carbon fiber electrode connected to an external circuit was placed. The space corresponding to the Proton Exchange Membrane (PEM) was continually implemented with a new ratio of soil and activated carbon on the top of it, and the cathode electrode was placed to form the MFCs circuit. In order to monitor the anodic pH, internal temperature and voltage (mV) sensors were installed for each MFC during a 60 day period. Microbiological analysis determined Colony Forming Units (CFU) for each of the MFCs, establishing an inverse correlation between the number of CFUs and the bioelectricity generation. The compositional analysis showed similar rates in M1 and M3 for nitrogen-free extract associated to carbohydrate compounds; M2 determined presence of cellulose since it contained a higher amount of vegetables. The ANOVA test for bioelectricity production indicated a similar behavior in the MFC1 and MFC3, while production of bioelectricity MFC2 differs significantly. This indicates a better performance in the production of bioelectricity in MFC1 and MFC3. However, to identify microorganism conglomerate showing better bioelectrical response it is necessary to work with molecular techniques

Plan tributario para disminuir las sanciones tributarias en las mypes de la Avenida Los Alisos del distrito de Los Olivos – 2019

El presente informe de investigación “Plan tributario para disminuir las sanciones tributarias en las Mypes de la Avenida Los Alisos del distrito de Los Olivos - 2019”, tiene como objetivo general, Diseñar un plan tributario para disminuir significativamente las sanciones tributarias en las Mypes. de la Avenida Los Alisos del distrito de Los Olivos – 2019. Este informe se desarrolló con un enfoque cuantitativo, del tipo de investigación aplicada con el diseño no experimental transversal descriptivo, el muestreo utilizado fue censal por lo que se incluyó a 40 Mypes ubicadas en la avenida Los Alisos, de la cuadra 10 a la 20, como instrumento se aplicó el cuestionario conformada por 20 preguntas. Para obtener la validez de instrumentos, se tomó en cuenta el juicio de expertos de la Universidad César Vallejo, para determinar el grado de confiabilidad se utilizó el Coeficiente de Alpha de Cronbach y para la validación, la prueba de Chi Cuadrado de Pearson. Se concluye que el plan tributario, disminuye significativamente las sanciones tributarias de las Mypes de la Avenida Los Alisos del distrito de Los Olivos. Así mismo se diseñó un plan tributario para disminuir las sanciones tributarias en las Mypes del Distrito de Los Olivos – 201

Smooth-i:smart re-calibration using smooth pursuit eye movements

Eye gaze for interaction is dependent on calibration. However, gaze calibration can deteriorate over time affecting the usability of the system. We propose to use motion matching of smooth pursuit eye movements and known motion on the display to determine when there is a drift in accuracy and use it as input for re-calibration. To explore this idea we developed Smooth-i, an algorithm that stores calibration points and updates them incrementally when inaccuracies are identified. To validate the accuracy of Smooth-i, we conducted a study with five participants and a remote eye tracker. A baseline calibration profile was used by all participants to test the accuracy of the Smooth-i re-calibration following interaction with moving targets. Results show that Smooth-i is able to manage re-calibration efficiently, updating the calibration profile only when inaccurate data samples are detected

“Estado nutricional y desarrollo psicomotor en preescolares de 3 años de la institución educativa El Olivar de los Niños. Bellavista- Callao, 2017”

El estudio de investigación "Estado nutricional y Desarrollo psicomotor en preescolares de 3 años de la Institución Educativa “El Olivar de los niños” tiene como Objetivo: Determinar la relación entre estado nutricional y el desarrollo psicomotor en preescolares de 3 años de edad de la Institución Educativa “El Olivar de los niños” Bellavista- Callao 2017. Material y método: tipo de estudio descriptivo, inferencial de corte transversal con un diseño experimental, la población estuvo conformada por 110 niños y la muestra es la misma población. El estado nutricional se evaluó según las tablas de valoración antropométricas de niñas y niños <5 años y el desarrollo psicomotor se evalué con el TPED: (Test Peruano de Evaluación del Desarrollo, del MINSA la cual se evalúa el área de coordinación, motricidad y lenguaje. En estado nutricional predomina el estado normal con 96 preescolares que equivalen a 87.3%, con delgadez se encontró a 1 preescolar que equivale a 0.9%, con sobrepeso se encontró a 7 preescolares que equivalen al 6.4% y con obesidad se encontró a 6 preescolares que equivalen al 5.5%.Trabado de investigacio

Growth Factor Binding Peptides in Poly (Ethylene Glycol) Diacrylate (PEGDA)-Based Hydrogels for an Improved Healing Response of Human Dermal Fibroblasts

Growth factors (GF) are critical cytokines in wound healing. However, the direct delivery of these biochemical cues into a wound site significantly increases the cost of wound dressings and can lead to a strong immunological response due to the introduction of a foreign source of GFs. To overcome this challenge, we designed a poly(ethylene glycol) diacrylate (PEGDA) hydrogel with the potential capacity to sequester autologous GFs directly from the wound site. We demonstrated that synthetic peptide sequences covalently tethered to PEGDA hydrogels physically retained human transforming growth factor beta 1 (hTGFβ1) and human vascular endothelial growth factor (hVEGF) at 3.2 and 0.6 ng/mm2, respectively. In addition, we demonstrated that retained hTGFβ1 and hVEGF enhanced human dermal fibroblasts (HDFa) average cell surface area and proliferation, respectively, and that exposure to both GFs resulted in up to 1.9-fold higher fraction of area covered relative to the control. After five days in culture, relative to the control surface, non-covalently bound hTGFβ1 significantly increased the expression of collagen type I and hTGFβ1 and downregulated vimentin and matrix metalloproteinase 1 expression. Cumulatively, the response of HDFa to hTGFβ1 aligns well with the expected response of fibroblasts during the early stages of wound healing