Ambiente laboral y la fidelización de los clientes en una empresa de metalmecánica, Independencia, 2023

El objetivo de la investigación fue determinar la relación entre las variables ambiente laboral y fidelización de los clientes, en una empresa de metalmecánica, Independencia, 2023. La metodología fue de enfoque cuantitativo, de tipo aplicada, con nivel descriptivo correlacional, de diseño no experimental y corte transversal. Por otra parte, para la recolección de información de las variables de estudio se utilizó un cuestionario compuesto por 12 ítems, el cual se aplicó a la población que estuvo conformada por 50 trabajadores. La prueba de Rho de Spearman arrojó un coeficiente de correlación de 0,593, donde se evidenció que existe una relación positiva considerable entre las variables. Finalmente, se concluyó que existe relación entre el ambiente laboral y la fidelización de los clientes, por lo que se aceptó la hipótesis alterna de la investigación

Propuesta de diseño gimnasio polideportivo y estadio de Catalina Zona 6 Villa Nueva Guatemala.

Planifica un complejo deportivo, que cuente con estadio y gimnasio, para el departamento de Villa Nueva. Las áreas planificadas son las externas con plaza de ingreso, accesos peatonales, parqueos y espacios para estar. Áreas para canchas y áreas de taquilla, vestíbulo, vestidores y otros servicios. En el proyecto se consideró el impacto ambiental para ocasionar el mínimo daño al ambiente

Nitrogen Doped Carbon Nanofibers Derived from Water-Soluble Precursors

Nitrogen doped carbon fibers were synthesized from polyvinyl alcohol (PVA), a water soluble precursor. The PVA fine fibers were first developed by centrifugally spinning an aqueous based solution using Forcespinning® technology. The precursor fibers were then exposed to sulfuric acid vapors to partially carbonize and stabilize the fibers for further heat treatment. For nitrogen doping, the fibers were exposed to two different heat treatment routes. One was under a nitrogen atmosphere at 850°C followed by exposure to ammonia gas at 500°C. The second route consisted of heating the treated fibers in pure ammonia gas only, up to 850°C. Both heating schemes resulted in carbon based fibers that showed evidence of nitrogen content as shown by energy-dispersive X-ray spectroscopy. The second route showed an effective doping of the carbon fiber with nitrogen atoms, measured by X-ray photoelectron spectroscopy, which indicated that the nitrogen atoms were fully incorporated into the carbon framework

Herramienta para la Automatización de la Revisión Sistemática

Resumen: La realización de una revisión sistemática provee a los investigadores las bases para obtener conocimiento científico mediante la identificación de artículos científicos relevantes, los cuales contengan las tendencias en investigación y experimentación acerca de un tema en específico. Existen varios estudios acerca de cómo implementar una revisión sistemática, sin embargo, estas investigaciones solo indican los pasos que conforma el protocolo de la revisión sistemática, sin proporcionar alguna herramienta o aplicación de software que soporte la automatización de este protocolo, dando como resultado que los investigadores dediquen una buena cantidad de tiempo en la detección y búsqueda de artículos científicos relevantes de manera manual. Por lo tanto, en este artículo se presenta la propuesta de una herramienta para la automatización del protocolo de la Revisión sistemática, con la finalidad de reducir el tiempo en el desarrollo del protocolo de la Revisión Sistemática. Palabras clave: Revisión Sistemática, Protocolo, Herramientas

Machine Fault Detection Based on Filter Bank Similarity Features Using Acoustic and Vibration Analysis

Vibration and acoustic analysis actively support the nondestructive and noninvasive fault diagnostics of rotating machines at early stages. Nonetheless, the acoustic signal is less used because of its vulnerability to external interferences, hindering an efficient and robust analysis for condition monitoring (CM). This paper presents a novel methodology to characterize different failure signatures from rotating machines using either acoustic or vibration signals. Firstly, the signal is decomposed into several narrow-band spectral components applying different filter bank methods such as empirical mode decomposition, wavelet packet transform, and Fourier-based filtering. Secondly, a feature set is built using a proposed similarity measure termed cumulative spectral density index and used to estimate the mutual statistical dependence between each bandwidth-limited component and the raw signal. Finally, a classification scheme is carried out to distinguish the different types of faults. The methodology is tested in two laboratory experiments, including turbine blade degradation and rolling element bearing faults. The robustness of our approach is validated contaminating the signal with several levels of additive white Gaussian noise, obtaining high-performance outcomes that make the usage of vibration, acoustic, and vibroacoustic measurements in different applications comparable. As a result, the proposed fault detection based on filter bank similarity features is a promising methodology to implement in CM of rotating machinery, even using measurements with low signal-to-noise ratio

Mycobiome analysis of asymptomatic and symptomatic Norway spruce trees naturally infected by the conifer pathogens Heterobasidion spp.

Plant microbiome plays an important role in maintaining the host fitness. Despite a significant progress in our understanding of the plant microbiome achieved in the recent years, very little is known about the effect of plant pathogens on composition of microbial communities associated with trees. In this study, we analysed the mycobiome of different anatomic parts of asymptomatic and symptomatic Norway spruce trees naturally infected by Heterobasidion spp. We also investigated the primary impact of the disease on the fungal communities, which are associated with Norway spruce trees. Our results demonstrate that the structure of fungal communities residing in the wood differed significantly among symptomatic and asymptomatic Heterobasidion-infected trees. However, no significant differences were found in the other anatomic regions of the trees. The results also show that not only each of individual tree tissues (wood, bark, needles and roots) harbours a unique fungal community, but also that symptomatic trees were more susceptible to co-infection by other wood-degrading fungi compared to the asymptomatic ones.Peer reviewe

Application of the Activities of the Nursing Intervention Bladder Catheterization (0580) in Adults Admitted to a Second-Level Hospital

Introducción: Los eventos adversos relacionados con la instalación de sonda vesical son de los fenómenos asociadas a la atención sanitaria más comunes en México. Objetivo: Identificar que actividades de las contempladas en la intervención de enfermería, “sondaje vesical (0580)” se aplican en mayor y menor medida. Metodología: Estudio de tipo cuantitativo, descriptivo y transversal. La muestra compuesta por 78 enfermeras(os), en un hospital de segundo nivel; se utilizó una lista de cotejo con 23 actividades de la intervención de enfermería sondaje vesical (0580) de la NIC, y un cuestionario para determinar las características sociodemográficas de las enfermeras. Se utilizó una escala Likert con 5 opciones de respuesta, de no realizada hasta muchas veces realizada. Se utilizó estadística descriptiva con frecuencias y porcentajes. Resultados: de 78 profesionales de enfermería el 68% fue conformado por el sexo femenino y el 32% del sexo masculino, en su mayor parte auxiliares de enfermería 37%, Las actividades realizadas con mayor frecuencia fueron las relacionadas con la prevención de infecciones y las menos realizadas con la instalación y retiro. Conclusión: La NIC presenta un numero amplio de actividades para el sondaje vesical, aunque algunas actividades tienen mayor aplicabilidad y otras son menos aplicadas por enfermeras mexicanas.Introduction: Adverse events related to urinary catheter installation are among the most common phenomena associated with health care in Mexico. Objective: To identify which activities of those contemplated in the nursing intervention, "bladder catheterization (0580)" are applied to a greater and lesser extent. Methodology: Quantitative, descriptive, and cross-sectional study. The sample consisted of 78 nurses in a second-level hospital; a checklist was used with 23 activities of the bladder catheterization nursing intervention (0580) of the NIC, and a questionnaire to determine the sociodemographic characteristics of the nurses. A Likert scale was used with 5 answer options, not performed until many times performed. Descriptive statistics with frequencies and percentages were used. Results: of 78 nursing professionals, 68% were female and 32% male, mostly nursing assistants 37%, The activities performed most frequently were those related to infection prevention and the least performed with installation and removal. Conclusion: NIC presents many activities for bladder catheterization, although some activities have greater applicability and others are less applied by Mexican nurses

A promoter DNA demethylation landscape of human hematopoietic differentiation

Global mechanisms defining the gene expression programs specific for hematopoiesis are still not fully understood. Here, we show that promoter DNA demethylation is associated with the activation of hematopoietic-specific genes. Using genome-wide promoter methylation arrays, we identified 694 hematopoietic-specific genes repressed by promoter DNA methylation in human embryonic stem cells and whose loss of methylation in hematopoietic can be associated with gene expression. The association between promoter methylation and gene expression was studied for many hematopoietic-specific genes including CD45, CD34, CD28, CD19, the T cell receptor (TCR), the MHC class II gene HLA-DR, perforin 1 and the phosphoinositide 3-kinase (PI3K) and results indicated that DNA demethylation was not always sufficient for gene activation. Promoter demethylation occurred either early during embryonic development or later on during hematopoietic differentiation. Analysis of the genome-wide promoter methylation status of induced pluripotent stem cells (iPSCs) generated from somatic CD34+ HSPCs and differentiated derivatives from CD34+ HSPCs confirmed the role of DNA methylation in regulating the expression of genes of the hemato-immune system, and indicated that promoter methylation of these genes may be associated to stemness. Together, these data suggest that promoter DNA demethylation might play a role in the tissue/cell-specific genome-wide gene regulation within the hematopoietic compartment

Antimicrobial resistance among migrants in Europe: a systematic review and meta-analysis

BACKGROUND: Rates of antimicrobial resistance (AMR) are rising globally and there is concern that increased migration is contributing to the burden of antibiotic resistance in Europe. However, the effect of migration on the burden of AMR in Europe has not yet been comprehensively examined. Therefore, we did a systematic review and meta-analysis to identify and synthesise data for AMR carriage or infection in migrants to Europe to examine differences in patterns of AMR across migrant groups and in different settings. METHODS: For this systematic review and meta-analysis, we searched MEDLINE, Embase, PubMed, and Scopus with no language restrictions from Jan 1, 2000, to Jan 18, 2017, for primary data from observational studies reporting antibacterial resistance in common bacterial pathogens among migrants to 21 European Union-15 and European Economic Area countries. To be eligible for inclusion, studies had to report data on carriage or infection with laboratory-confirmed antibiotic-resistant organisms in migrant populations. We extracted data from eligible studies and assessed quality using piloted, standardised forms. We did not examine drug resistance in tuberculosis and excluded articles solely reporting on this parameter. We also excluded articles in which migrant status was determined by ethnicity, country of birth of participants' parents, or was not defined, and articles in which data were not disaggregated by migrant status. Outcomes were carriage of or infection with antibiotic-resistant organisms. We used random-effects models to calculate the pooled prevalence of each outcome. The study protocol is registered with PROSPERO, number CRD42016043681. FINDINGS: We identified 2274 articles, of which 23 observational studies reporting on antibiotic resistance in 2319 migrants were included. The pooled prevalence of any AMR carriage or AMR infection in migrants was 25·4% (95% CI 19·1-31·8; I2 =98%), including meticillin-resistant Staphylococcus aureus (7·8%, 4·8-10·7; I2 =92%) and antibiotic-resistant Gram-negative bacteria (27·2%, 17·6-36·8; I2 =94%). The pooled prevalence of any AMR carriage or infection was higher in refugees and asylum seekers (33·0%, 18·3-47·6; I2 =98%) than in other migrant groups (6·6%, 1·8-11·3; I2 =92%). The pooled prevalence of antibiotic-resistant organisms was slightly higher in high-migrant community settings (33·1%, 11·1-55·1; I2 =96%) than in migrants in hospitals (24·3%, 16·1-32·6; I2 =98%). We did not find evidence of high rates of transmission of AMR from migrant to host populations. INTERPRETATION: Migrants are exposed to conditions favouring the emergence of drug resistance during transit and in host countries in Europe. Increased antibiotic resistance among refugees and asylum seekers and in high-migrant community settings (such as refugee camps and detention facilities) highlights the need for improved living conditions, access to health care, and initiatives to facilitate detection of and appropriate high-quality treatment for antibiotic-resistant infections during transit and in host countries. Protocols for the prevention and control of infection and for antibiotic surveillance need to be integrated in all aspects of health care, which should be accessible for all migrant groups, and should target determinants of AMR before, during, and after migration. FUNDING: UK National Institute for Health Research Imperial Biomedical Research Centre, Imperial College Healthcare Charity, the Wellcome Trust, and UK National Institute for Health Research Health Protection Research Unit in Healthcare-associated Infections and Antimictobial Resistance at Imperial College London