Facturación electrónica y el costo de implementación en las empresas electro ferreteras del Cercado de Lima, 2019

El presente trabajo de investigación tendrá como objetivo analizar la relación existente en la Facturación Electrónica y el Costo de Implementación enfocada en las empresas Electro ferreteras ubicadas en el Cercado de Lima, 2019. De acuerdo a lo analizado se recopilo información de estudios realizados a través de referencias bibliográficas que nos describen a cada variable, la presente investigación es de diseño No experimental puesto que no hay manipulación de ninguna variable, así mismo es de nivel Correlacional ya que sus variables se relacionan una de otra, es de tipo básica y se realizó con el fin de evaluar el nivel de estado de las variables utilizadas en el estudio de investigación utilizando el enfoque Cuantitativo porque se analizara la relación entre ambas variables a través de análisis estadísticos y pruebas. , Para obtener resultados verídicos se empleó la técnica de la encuesta al área de facturación de cada empresa electro ferretera encuestada ubicadas en el Cercado de Lima, Además, con respecto al instrumento que se utilizó para la recolección de información es el cuestionario. Lo que se quiere lograr con la siguiente investigación es crear un antecedente de información para que a futuro pueda ser aprovechada de manera positiva y con su implementación se logre consolidar a nivel nacional la masificación de la facturación electrónica en todos los rubros empresariales

Promoción del consumo de frutas en niños en edad escolar

La FAO promueve actividades en pos de lograr los Objetivos de Desarrollo Sostenible, incluyendo “Hambre cero” y “Bienestar y Salud”. La educación nutricional en escolares permite acercar alimentos saludables e implementar hábitos que pueden extenderse durante la vida. En simultáneo, la difusión de las producciones regionales de los alimentos saludables colabora en la inserción de estos sistemas alimentarios en el ámbito escolar. Este estudio reflejó el impacto que tuvieron los atributos de cada variedad sobre la preferencia y la aceptabilidad en la población estudiada. Además, el ensayo permitió difundir variedades de frutas patagónicas en niños en el contexto de una actividad escolar. El objetivo de este trabajo fue dar a conocer dos variedades de manzanas y dos de peras a niños en edad escolar de la zona oeste del Gran Buenos Aires (La Matanza, Merlo, Morón, San Miguel, Tres de Febrero y Lomas de Zamora) durante la Semana Nacional de la Ciencia y la Tecnología en INTA Castelar.Fil: Merayo, Manuela. Instituto Nacional de Tecnología Agropecuaria (INTA). CIA. Instituto Tecnología de Alimentos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Argentina. Pontificia Universidad Católica Argentina (UCA). Facultad de Ciencias Médicas; Argentina.Fil: Merayo, E. Fundación Barrera Zoofitosanitaria Patagónica (FUNBAPA); Argentina.Fil: Hernandez, S. Federación de Productores de Frutas de Río Negro y Neuquén; Argentina.Fil: Soteras, Trinidad. Instituto Nacional de Tecnología Agropecuaria (INTA). CIA. Instituto Tecnología de Alimentos; Argentina

Electrochemical Impedance Spectroscopy (EIS): A Review Study of Basic Aspects of the Corrosion Mechanism Applied to Steels

AC impedance measurements have been applied for over twenty years in electrochemistry and physics to investigate the electrical properties of conductive materials and their interfaces using an external electrical impulse (VOLTAGE, V or CURRENT, I) as driving force. Furthermore, its application has recently appeared to be destined in the Biotechnology field as an effective tool for rapid microbiologic diagnosis of living organism in situ. However, there is no doubt that the electrochemical impedance spectroscopy (EIS) is still one of the most useful techniques around the world for metal corrosion control and its monitoring. Corrosion has long been recognized as one of the most expensive stumbling blocks that concern many industries and government agencies, because it is a steel destructive phenomenon that occurs due to the chemical interaction with aqueous environments and takes place at the interface between metal and electrolyte producing an electrical charge transfer or ion diffusion process. Consequently, it is experimentally possible to determine through the EIS technique the mechanism and control that kinectics of corrosion reactions encounter. First, EIS data is collected through a potentiostat/ galvanostat apparatus. After, it is fitted to a mathematical model (i.e. an equivalent electrical circuit, EEC) for its interpretation and analysis, fundamentally seeking a meaningful physical interpretation. Finally, this review reports some basic aspects of the corrosion mechanism applied to steels through the experimental EIS response using Nyquist or Bode plots. Examples are given for different applied electrochemical impedance cases in which steel is under study intentionally exposed to a corrosive aqueous solution by applying a sinusoidal potential at various test conditions

Increased mRNA expression of cytochrome oxidase in dorsal raphe nucleus of depressive suicide victims

Suicidal behavior is a problem with important social repercussions. Some groups of the population show a higher risk of suicide; for example, depression, alcoholism, psychosis or drug abuse frequently precedes suicidal behavior. However, the relationship between metabolic alterations in the brain and premorbid clinical symptoms of suicide remains uncertain. The serotonergic and noradrenergic systems have frequently been, implicated in suicidal behavior and the amount of serotonin in the brain and CSF of suicide victims has been found to be low compared with normal subjects. However, there are contradictory results regarding the role of noradrenergic neurons in the mediation of suicide attempts, possibly reflecting the heterogeneity of conditions that lead to a common outcome. In the present work we focus on the subgroup of suicide victims that share a common diagnosis of major depression. Based on post-mortem studies analyzing mRNA expression by in situ hybridization, serotonergic neurons from the dorsal raphe nucleus (DRN) from depressive suicide victims are seen to over-express cytochrome oxidase mRNA. However, no corresponding changes were found in the expression of tyrosine hydroxylase (TH) mRNA in the noradrenergic neurons of the Locus Coeruleus (LC). These results suggest that, despite of the low levels of serotonin described in suicide victims, the activity of DRN neurons could increase in the suicidally depressed, probably due to the over activation of serotonin re-uptake. No alteration was found in noradrenergic neurons, suggesting that they play no crucial role in the suicidal behavior of depressive patients

Synthesis and Characterization of Polyaniline/Magnetite Nanocomposite

trabajo de investigación de Red TemáticaA conducting-electroactive polyaniline/magnetite (PAni/Fe304) nanocomposite was synthesized using anilinium dodecylbenzene sulfonate (S1) as a reactive surfactant. First, S1 allowed magnetite dispersion in the aqueous phase and second, S1 performed as the monomer of polyaniline emeraldine base salt. Electron microscopy suggested core-shell morphology based on S1 amphiphilic character; that is, S1 adsorbed onto the magnetite nanoparticles surface and then was polymerized via an oxidative polymerization forming the shell. The PAni/Fe304 composite exhibited improved thermal stability regarding pure PAni, which was related to the strong interaction between PAni and magnetite. Electrical conductivity, determined by the four-probe method, was in the order of 10-1 and 10-3 S cm-1, respectively, for the pure PAni and the composite. Concerning composite magnetic properties, the decrement in magnetization (σr) and hysteresis (Hc) was attributed to the increment in dipolar magnetic interaction due to the increased separation among magnetite nanoparticles because of the PAni shell.PROMEP-SEP, Programa: Redes Temáticas de Colaboración Académica, "Red de Compuestos Poliméricos, Propiedades y Aplicacione

Effect of Boriding on the Mechanical Properties of AISI 1045 Steel

Efecto en las propiedades mecánicas de un acero borurado 1045.Some mechanical properties of AISI 1045 borided steels were estimated in the present work. The boriding process was carried out by the powder pack method at 950°C with 8 h of treatment. The fatigue strength on borided notched specimens was evaluated with rotating bending tests (R=1) considering a stress concentration factor (Kt) of 2.53. Likewise, the presence of residual stresses in boride layers was established by the XRD technique. The Daimler-Benz Rockwell C test was used, also, to estimate the strength adhesion of the coated system. The results show a decrease in the fatigue strength of AISI borided steels due to the presence of high porosity in the layers. Finally, the Rockwell-C adhesion test showed no coating failure for the boride layer

A systemic model of analysis of organizational culture in health care services

Introduction: The aim of this paper is to present the results of a case study carried out in the state of Hidalgo under a systemic model of analysis. This focused the organizational culture of health care services with the main purpose of studying these organizations and to understand their inner and outer dynamics. Method: A case study carried out under qualitative approach with the application of focus groups and interviews in communitarian health centers, physicians offices, sanatoriums and hospitals of the state of Hidalgo, Mexico. Results: The organizational culture in health care services was classified into 4 subsystems: human, technical-technological, functionalstructural and environmental macrosystem. Conclusion: An interrelation among the four subsystems was identified defining the dynamics of organizational culture of health care services in three transactions: interdynamics, intradynamics and outerdynamics

Modelling the growth of popliteal artery aneurysms

Background: Popliteal artery aneurysms (PAAs) comprise up to 85 per cent of all peripheral aneurysms. Few longitudinal studies track their progression. This study aimed to track the growth of asymptomatic PAAs in a hospital‐based ultrasound service, and compare models of aneurysm growth. Methods: This retrospective single‐centre cohort study included patients who had a PAA on arterial duplex ultrasound imaging of the lower limbs between 1 January 2011 and 1 January 2016. Progression of PAA size and progression to event or intervention were the primary outcome measures. Results: Some 282 images were analysed: 47 limbs with PAA were included in a cohort of 32 patients (15 had bilateral PAAs). Twenty patients also had an abdominal aortic aneurysm (AAA). Linear multilevel modelling estimated that PAA growth was 2·4 (95 per cent c.i. 1·6 to 3·7) mm a year. Growth was estimated at 0·8 (0·1 to 1·5) mm per year in patients without an AAA and 3·5 (2·9 to 4·2) mm per year in those with a known AAA (previous open repair, previous endovascular aneurysm repair or AAA under surveillance) (P < 0·001). Conclusion: Growth rates of PAA were heterogeneous but were optimally predicted by multilevel modelling. Patients with an existing AAA may have faster PAA progression than those without

Association of the microsatellite in the 3' untranslated region of the CD154 gene with rheumatoid arthritis in females from a Spanish cohort: a case-control study

CD40–CD154 interaction is an important mediator of inflammation and has been implicated in T helper type 1-mediated autoimmune diseases including rheumatoid arthritis (RA). Linkage studies have shown association of markers in the proximity of the CD154 gene. In the present work we investigated whether specific allele variants of the microsatellite in the 3' UTR of the CD154 gene might modulate the risk of RA. The study, in a case-control setting, included 189 patients and 150 healthy controls from the Canary Islands, Spain. The 24CAs allele was less represented in female patients than in controls (0.444 in controls versus 0.307 in patients, P = 0.006, odds ratio (OR) 0.556, 95% confidence interval (CI) 0.372 to 0.831) but not in males (0.414 versus 0.408), and only when homozygous (P = 0.012; OR 0.35, 95% CI 0.16 to 0.77). We also verified that CD154 association with RA was independent of human leukocyte antigen (HLA) phenotype. A further functional study showed that after stimulation anti-CD3, CD154 mRNA was more stable in CD4+ T lymphocytes from patients with RA bearing the 24CAs allele (mRNA half-life 208 minutes) than in patients without the 24CAs allele (109 minutes, P = 0.009). However, a lower percentage of CD154+CD4+ T lymphocytes was seen in freshly isolated peripheral blood mononuclear cells from patients carrying 24CAs alleles (mean 4.28 versus 8.12; P = 0.033), and also in CD4+ T lymphocytes stimulated with anti-CD3 (median 29.40 versus 47.60; P = 0.025). These results were concordant with the smaller amounts of CD154 mRNA isolated from stimulated T lymphocytes with 24CAs alleles. The CD154 microsatellite therefore seems to affect the expression of the gene in a complex manner that implies not only mRNA stability. These data suggest that the CD154 microsatellite contributes to the regulation of mRNA and protein expression, although further studies will be necessary to elucidate its role in disease predisposition

Frequency of gastronintestinal parasite of dogs in public parks in two neighboring municipalities of state of Mexico

Artículo científicoLa contaminación de suelos por parásitos gastrointestinales representa un problema mundial y un riesgo a la salud. Objetivo. Determinar la presencia de parásitos en heces de perros en los parques públicos del área. Materiales y métodos. Se recolectaron muestras de heces en 27 parques públicos de Metepec y Toluca Estado de México, mismos que se procesaron con 3 técnicas parasitológicas; 81.4% de los parques públicos resultaron positivos a parásitos gastrointestinales, con una frecuencia global de muestras del 16.5%. El porcentaje de parasitosis con potencial zoonótico fue de 81.3%; Toxocara spp, Ancylostoma spp y Giardia spp fueron las especies zoonóticas identificadas. Conclusiones. Los resultados indican que los parques de la zona conurbada de Toluca representan un problema de salud pública importante al ser una fuente de parásitos gastrointestinales zoonóticos de perro