bluuebunny/crossref_metadata_2025 huggingface dataset:
New Protective Stent for Intravenous Fontan Blood Pump
Authors:   , Stenger Emma , Throckmorton Amy
Published: July 2021

Thousands of infants are born every year with cardiac defects leaving them with only one functioning ventricle. As a result of these defects, these infants undergo strenuous palliative procedures to create what is known as a Fontan physiology and still are left facing numerous complications including congestive heart failure, thrombosis, arrhythmias and more. Treatment and management costs for these Fontan patients exceeds $1 billion every year, and the available donor supply is too small to be considered a feasible solution. The available blood pumps and ventricular assist devices, while they have been implemented successfully in some cases, were not specifically designed for these single ventricle patients and thus have several shortcomings. The size of these pumps in addition to rigid design leads to irregular flow dynamics, insufficient performance and blood damage. It is suggested that only 1-5 mmHg would be sufficient to alleviate the many complications associated with single ventricle physiology, making a purposely designed blood pump a viable solution as a bridge therapy to heart transplantation. Using computational means and experimental testing, this study investigated the use of a minimally invasive axial flow blood pump with a cage and impeller to support the Fontan physiology until a donor heart becomes available. Prior research focused on cage filament direction and impeller angle separately, making the focus of this thesis determining an optimal combination of cage and impeller design. Design geometries were rapid prototyped to be experimentally tested and Solidworks models were used in ANSYS CFX to run computational simulations. Geometries varied in the number of filaments, cross-sectional shape of the filament and the impeller blade angle of twist. Pressure generation, capacity range, estimated shear stresses and blood damage levels were examined. Both the simulations and experiments demonstrated that the new cage designs were within the desired pressure rise and hemodynamic ranges, but qualitatively some designs were able to outperform others. A resulting combination of the 5-filament cage design with the 350°impeller angle was determined as optimal, thus furthering the support in the development of an axial flow blood pump for a failing Fontan physiology.
Anion Adsorption and clay-like swelling of Ti₃C₂T_z MXene multilayers
Authors:   , Voigt Cooper Augustus , Barsoum Michel W.
Published: July 2021

MXenes are a relatively new and large family of two-dimensional (2D) early transition metal carbides derived typically by etching the MAX phases in fluoride containing solutions. While numerous studies have investigated the role of cations on the interlayer distance (d_[c/2]) between MXene multilayers (MLs) very little is known about the role of anions. Herein, using mainly X-ray diffraction (XRD), the effect of anions on d_[c/2] of Ti₃C₂T_z MLs, where T represents various terminations, was systematically studied. The MLs were produced by etching Ti₃AlC₂ powders in hydrofluoric (HF) acid alone or in mixtures of HF and mineral acids with anions larger than F, viz. hydrochloric, hydrobromic, hydroiodic, sulfuric or phosphoric acids. The nature of the cations present in the post-etching washing solutions was also varied. The results show that the presence of the larger anions demonstrably facilitates water intercalation and de-intercalation. The fact that, for the most part, d_[c/2] in fully dried MLs are not a function of mineral acid, together with post-etching chemical analysis with energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) showing that the amount of residual anions after etching was quite small - in some cases vanishingly so - leads to the conclusion that the larger anions do not enter the interlayer space, but most probably preferentially adsorb onto the positively charged ML edges, keeping the interlayer space open which, in turn, eases water intercalation and de-intercalation.
Improving Team Behaviors Utilizing Simulation
Authors:   , Halligan Maryanne , Okupniak Carol , Crothers Ruth , Wilson Linda
Published: July 2021

A team of healthcare professionals responds immediately when a call for help occurs during cardiac arrest in a hospital setting. Patients who suffer from a cardiac arrest in the hospital rely on a high level of team performance for improved survival. The inability to have a consistent team available seven days a week, day and night, creates challenges to produce a high functioning team for success. Simulation has been identified as an education methodology that allows teams to practice clinical events in a safe environment. Incorporating team behaviors in this training can improve team functions even when the team changes from shift to shift. The purpose of this Doctor of Nursing Practice project is to demonstrate the effectiveness of a one-hour simulation training exercise on team behaviors of ad hoc resuscitation teams. The structure of the team includes registered nurses (RN), physicians, physician assistants (PA), respiratory therapists (RT) and pharmacists, who respond to rapid response/code alerts. Participants will take part in a simulated cardiac emergency. A team attitudes survey was presented both pre and post simulation. There was no statistical difference in team attitudes, however post survey comments denoted positive learning experience. The Team Emergency Assessment and Measurement (TEAM) tool measured the simulation pre and post debriefing after repeating the same scenario. The overall TEAM score noted a statistical significant change in the team behaviors (p=.000). Results noted an improvement of the score for the TEAM tool.
Investigating Quadruple Perovskites
Authors:   , Huon Amanda , May Steven J. , Pomerantseva Ekaterina
Published: July 2021

The miniaturization trend in conventional electronics is approaching the limits beyond which the reduction of the electronic element is becoming more and more difficult. One way to continue the current trends in computer power and data storage increase without further size reduction is to use new functionalities such as charge-ordering or multiferroic behavior in devices. Complex oxide heterostructures are a materials platform that exhibit an unmatched array of collectively ordered states, including magnetism, ferroelectricity, and charge/orbital ordering, and are being researched for potential device applications. As a member of the quadruple perovskite family, CaMn₇O₁₂ exemplifies the rich physics that complex oxides can host. Previous work shows that this material in bulk form exhibits four distinct phase transitions: a charge-ordering transition at 430 K, an orbital ordering transition at 250 K, and two magnetic transitions at 90 K (T_[N1]) and 45 K (T_[N2]). Additionally, the magnetic ordering at T_[N1] induces ferroelectricity, which is the largest magnetically induced polarization yet reported. Despite the scientific interest and the technological potential for this material, there have been no reports of CaMn₇O₁₂ films prior to this thesis work. This dissertation is focused on establishing growth conditions for CaMn₇O₁₂ quadruple perovskite thin films using molecular beam epitaxy and pulsed laser deposition methods. By synthesizing thin films using both methods, I identify the key parameters in establishing the growth conditions for phase-pure CaMn₇O₁₂ films by evaluating cation stoichiometry and structural properties. To develop insight into the role of thin film structure-property relations, I explore how the electronic and magnetic structures of thin films compare to bulk. Then I develop insight into quadruple manganites by elucidating how the electronic and magnetic properties are tuned by chemical pressure effects through A-site substitution in Ca_[1-x]Sr_xMn₇O₁₂ films. I identified the changes in charge-ordering, magnetic ordering, and helical spin structure through Sr-doping up to x ~ 0.6 by transport, magnetometry, and neutron diffraction measurements. These results provide fundamental insights into quadruple perovskite film synthesis and serve as a catalyst for future studies focused on AMn₇O₁₂ thin films. The material understanding of CaMn₇O₁₂ films obtained from this dissertation offers new avenues in the search and control of new functionalities in oxide heterostructures.
The Development of Taiwanese Dance Groups after Attending International Folklore Dance Festivals
Authors:   , Tien Yi-Chieh , Brody Jean
Published: July 2021

This research illustrates the benefits of attending international folklore dance festivals for six Taiwanese dance groups. Following interviews with the six dance groups, the findings revealed that attending international festivals increased the groups' visibility, motivated groups to hire more international and multilingual staff, and contributed to meaningful changes in their programs. The study further revealed additional, unexpected, findings, including that attendance at international dance festivals also contributed to changes in the dancers' artistic training and the establishment of a new festival. To better understand the groups experiences attending the festivals, the author conducted face to face in-depth interviews with members of each dance group to elicit information including the background of each dance group, their motivation for attending the festivals, and the impact these groups have realized.
Best Practices in Operating a Non-profit Marching Arts Organization
Authors:   , Snapp Anthony J. , Brody Jean
Published: July 2021

The marching arts are a niche activity that some people will dedicate their entire life to. Performance marching is a physically demanding and time-consuming activity. The rush experienced during performances, combined with the friendships that are built with your fellow corps members imprints the activity on your soul. In recent years there have been an alarming number of organizations experiencing scandal or ceasing operation. Information on these events are never publicly available, meaning other organizations cannot learn from the mistakes of others. This paper looks at the best practices of governance that ensure a non-profit marching arts organization like a drum and bugle corps or a winterguard should follow in order to remain relevant, financially stable, and free from scandal. Ten interviews were held with leaders of prominent marching arts organizations in order to gather information on four main themes: money, accountability, operations, and leadership. Each of these themes are vital to a marching arts organization functioning and being well-governed, which will result in a successful competitive season.
Problematics of Determining Interest in Peer-to-peer Lending in Indonesia
Authors: Annas Muhammad , Anshori Muhammad Anwar
Published: July 2021

Peer-to-peer lending is considered as the solution for people who require loans with easy terms. However, peer-to-peer lending in Indonesia causes some new problem related to the essential nature of it. Authorization of Indonesian Joint Funding Fintech (AFPI) determines peer-to-peer lending interest-debt possible to violate competition law in Indonesia. The paper aims to describe and analyze the authorization of Indonesian Joint Funding Fintech, which has a big chance to harm competition law in Indonesia. The author uses normative legal research methods and secondary data sources to examine the topic in this study. The result shows that the arrangement of interest-debt in peer-to-peer lending potentially creates a cartel and violates the basic principles of competition law in Indonesia.
The Power of Perception: Limitations of Information in Reducing Air Pollution Exposure
Authors: Hanna Rema , Hoffmann Bridget , Oliva Paulina , Schneider Jake
Published: July 2021

We conduct a randomized controlled trial in Mexico City to determine willingness to pay (WTP) for SMS air quality alerts and to study the effects of air quality alerts, reminders, and a reusable N95 mask on air pollution information and avoidance behavior. At baseline, we elicit WTP for the alerts service after revealing whether the household will receive an N95 mask and participant compensation, but before revealing whether they will receive alert or reminder services. While we observe no significant impact of mask provision on WTP, higher compensation increases WTP, suggesting a possible cash-on-hand constraint. The perception of high pollution days prior to the survey is positively correlated with WTP, but the presence of actual high pollution days is not correlated with WTP. Follow-up survey data demonstrate that the alerts treatment increases reporting of receiving air pollution information via SMS, a high pollution day in the past week, and staying indoors on the most recent perceived high pollution day. However, we observe no significant effect on the ability to correctly identify which specific days had high pollution. Similarly, households that received an N95 mask are more likely to report utilizing a mask with filter in the past two weeks, but we observe no effect on using a filter mask on the specific days with high particulate matter. Although we nd that air quality alerts increased the salience of air quality and avoidance behavior, these results illustrate the difficulty that information treatments face in overcoming perceptions to effectively reduce exposure to air pollution.
Various Image Processing Attacks for Image Watermarking in the Wavelet Domain Using Singular Value Decomposition and Discrete Cosine Transform
Authors: Riyajuddin  , Reddy Arikera Padmanabha
Published: July 2021

The dispersal of digital media due to the fast evolution of networked multimedia systems has created an essential need for copyright prompting technologies that can protect multimedia objects such as text, images, audio and videos from copyright ownership. This paper proposes digital image watermarking algorithm for copyright protection based on discrete wavelet transform, discrete cosine transform and singular value decomposition. In this method a watermark is embedded into the low frequency sub-band of a host image, after subjecting the watermarked image to various attacks like Gaussian noise, rotation sharpening, noise and pepper salt and speckle noise etc., we extract the originally inserted watermark images from LL sub-band by Truncated singular value decomposition and compare them on the basis of their mean square error, peak signal to noise ratio and normalized correlation values. Experimental results are provided to illustrate that the proposed scheme is the robustness of the technique on wide set of attacks.
“Either we defend our polishness or there will be no Polonia”. Practices of negotiating national identity among the Polish diaspora members in Cleveland
Authors: Gońda Marcin
Published: July 2021

The article presents the findings of a pilot study on the ways of negotiating national identity within the Polish community (Polonia) in the American city of Cleveland. The study showed the complex ways of maintaining and building cultural boundaries (and thus constructing collective identity) by the Polish diaspora in the situation of unequal power relations with the host society, but also within Polonia itself. These practices are conducted not only in opposition to the American society but also to members of their ethnic group, as a result of which there are simultaneous processes of strengthening and weakening diasporic ties, including and excluding individual members and groups. These processes are being reinforced by the existence of multifaceted divisions within this community (generational, social class-based, spatial, and political), which shape its condition and the patterns of its members’ participation.
Propiedades psicométricas de la Gender Role Conflict Scale en varones trabajadores del sector de comunicaciones de Lima Metropolitana
Authors:   , Chávarri Cafferata Mariel Alejandra , Lamas Nuñovero Andrea
Published: July 2021

El objetivo de la investigación fue determinar las propiedades psicométricas de la Gender Role Conflict Scale (GRCS) en varones que trabajan en el sector de comunicación en Lima Metropolitana. La muestra estuvo conformada por 337 varones, cuyo rango de edad oscila entre 23 a 58 años (M =34.00, DE = 9.39). Los instrumentos aplicados fueron la GRCS y la Escala de Pensamientos Patriarcales (EPP). En la validez basada en la estructura interna se comprobó el modelo de cuatro factores relacionados, mostrando un buen ajuste (χ²/gl = 2.06, CFI = .86 y, RMSEA = .06).  En la validez basada en relaciones con otras variables, entre los factores de la GRCS se obtuvo correlaciones altas y moderadas (valores de Pearson entre .24 y .78) y con las dimensiones de la EPP arrojó correlaciones bajas y moderadas (valores de Spearman entre .10. y .39). Los resultados del análisis de confiabilidad por consistencia interna indicaron coeficientes Omega (>.70) adecuados por cada dimensión. En general, la GRS posee adecuadas propiedades psicométricas.
Propuesta de concretos permeables para la captación de agua de lluvia en pavimentos de estacionamientos de hospitales en Arequipa
Authors:   , Ravello Bolo Mirella Rosa Linda , Baldeón Condori Andrea Stefany
Published: July 2021

La presente tesis consiste en presentar una propuesta sostenible que ayude en el control y almacenamiento del agua de lluvia para evitar inundaciones y daños producidos en los estacionamientos de los hospitales en la ciudad de Arequipa. Se evaluaron dieciocho diseños de mezclas, nueve realizados con agregado grueso Huso 7 y los otros nueve con Huso 67. Para los diferentes diseños se cambió el porcentaje de agregado fino, la relación agua/cemento y la dosis de los aditivos. Por cada diseño de mezcla se elaboraron nueve probetas destinadas al ensayo de resistencia a la compresión, tres por cada edad, ensayadas a los 7, 14 y 28 días; se utilizaron 2 vigas de 6”x6”x20” para determinar el Módulo de Rotura y 2 probetas de 4”x8” para hallar la tasa de permeabilidad, para lo cual se necesitó realizar una réplica del permeabilímetro expuesto en el ACI 522. Los resultados de todos los ensayos serán presentados y comparados entre sí para determinar el grado de influencia de los mismos. Además, también se realizará un análisis costo beneficio por metro cuadrado para determinar qué tanto varía el costo del concreto permeable en comparación con el concreto convencional. Finalmente, se realizará un análisis cuantitativo entre los dieciocho diseños de mezcla y el concreto convencional. Para así determinar cuál es la mezcla óptima que cumpla con los requisitos necesarios para ser implementado en los estacionamientos de los hospitales en Arequipa y pueda competir en el mercado con el concreto convencional.
Estrategias competitivas empleadas por las empresas exportadoras de jengibre de la región Junín relacionadas con el proceso de internacionalización hacia el mercado de Estados Unidos (Periodo 2014-2018)
Authors:   , Medrano Cristóbal Lizett Esmeralda , Rodríguez Hidalgo Paola Emily
Published: July 2021

El presente trabajo de investigación tiene como objetivo identificar la relación entre las estrategias competitivas empleadas por las empresas exportadoras de jengibre de la región Junín con el proceso de internacionalización hacia el mercado de Estados Unidos en el periodo 2014-2018, tomando como fuente de medición las estrategias de liderazgo en costos, diferenciación y enfoque desarrolladas por Porter (1998). Para el estudio, se aplicó una investigación mixta, con un diseño no probabilístico y análisis descriptivo correlacional. En tal sentido, para recopilar la información se realizaron encuestas a la muestra conformada por 12 empresas exportadoras de jengibre de la región Junín, a las cuales se aplicó un total de 25 encuestas referidas a las 4 dimensiones determinadas usando para el procesamiento de los resultados en el programa software SPSS. Además, se efectuaron 7 entrevistas a expertos de entidades como PROMPERU, MINCETUR, Sierra y Selva Exportadora y brókers334, analizadas a través del programa Atlas Ti. En el desarrollo estadístico para determinar la relación de las estrategias competitivas con la variable exportación de jengibre de la región Junín hacia Estados Unidos en el periodo 2014 -2018, se empleó el análisis de Rho Spearman, con el cual se obtuvo como resultado que la única estrategia que tiene correlación con la variable de exportación es la de liderazgo en costo, con un valor Rho Spearman de 0.613; siendo una correlación positiva considerable.
Factores que impulsaron el proceso de Internacionalización de las cadenas hoteleras extranjeras en Lima Metropolitana y Cusco durante el periodo del 2013 al 2019
Authors:   , Batallanos Fernández Giuliana Isabel
Published: July 2021

El Perú en los últimos años ha tenido un incremento en la oferta hotelera. Las categorías de tres, cuatro y cinco estrellas entre los años 2013 y 2018 elevaron su número de 769 a 1170 establecimientos, respectivamente. La presente investigación tiene como objetivo identificar si los factores específicos del país, los factores estructurales de la firma, y los factores estratégicos y de control impulsaron el proceso de Internacionalización de las cadenas hoteleras extranjeras en Lima Metropolitana y Cusco durante el periodo 2013 al 2019. En el primer capítulo, se planteó el marco teórico donde se detallaron los antecedentes epistemológicos. Para ello, se utilizaron recursos de investigación como: Ebsco, Jstor Kopernio, Proquest y Scopus. También, se consultaron repositorios académicos de universidades nacionales; de los cuales, 17 formaron parte de los antecedentes internacionales y 4 como antecedentes nacionales. En el tercer capítulo, se detalló la metodología de la investigación y se utilizó un enfoque cuantitativo no experimental. Se realizaron 33 encuestas a colaboradores de 20 marcas de hoteles, que pertenecen a 10 cadenas hoteleras extranjeras. Dicha información se procesó mediante el Software SPSS y se analizó mediante el modelo de correlación de Spearman. Finalmente, se presentaron las conclusiones y recomendaciones de la investigación donde se logró validar la hipótesis general. De este modo, se visualizó que en la encuesta un 64% está totalmente de acuerdo que uno de los factores que influye en la expansión de las cadenas hoteleras extranjeras es la estabilidad económica del país. Además, se recomendó para futuros estudios realizar una investigación cualitativa para tener otra perspectiva del sector.
Asignación de costos en el proceso productivo del arroz y su incidencia en la toma de decisiones financieras en las empresas molineras de Tarapoto, San Martin en el 2018
Authors:   , Cortijo Fiestas Diego Ernesto , Pacheco Cortez Gerson André
Published: July 2021

La presente tesis fue elaborada con la finalidad de analizar la asignación de costos en el proceso productivo del arroz y su incidencia en la toma de decisiones financieras. La evaluación se dará en las empresas molineras de la región San Martin en Tarapoto en el año 2018, ya que producen arroz y ofrecen servicios de molino. Bajo este escenario, nuestra tesis se desarrolla en el sector agrícola, especialmente en el del arroz, que es un producto básico para las canastas familiares en todo el país. Por ello, se analizará desde el proceso de cultivo del arroz hasta la cosecha y comercialización, para verificar si están optimizando recursos. En adición a ello, la función de la correcta asignación de los costos y gastos incurridos durante la etapa de producción es que exista un control financiero para determinar cómo viene realizando sus operaciones la empresa. El impacto que trae consigo nuestra tesis, es también de validar el alcance de las políticas contables; como la NIC 2 Inventarios y NIC 41 Agricultura principalmente en el sector agrícola, ya que muchas veces, la norma no es muy clara del todo y no tiene un alcance completo para el sector, por lo mismo que la industria tiene factores ajenos (ambientales principalmente) que hace más complicada el manejo de sus procesos internos. De esta forma, realizamos la presente tesis para que sirva como aporte a las empresas del sector, a que pueden generar ventajas competitivas, a través del control interno y de su correcta aplicación de la norma contable. Esto genera que se puede tomar mejores decisiones financieras y evaluar si los productos que ofrecen a los diversos clientes, generan rentabilidad y valor agregado para la empresa. Ya que, si se logra identificar mejoras en las etapas de producción, la empresa va tener mejor posición en el sector, y en consecuencia, mayores ingresos y recursos para mejorar infraestructura, tecnología, etc.
NIC 23: Costos por préstamos y su impacto en la Rentabilidad de las Universidades privadas con sede en Lima Sur, año 2019
Authors:   , De La Torre Calla Ana Luz , Moscoso Enrriquez Yackeline Eugenia
Published: July 2021

El presente trabajo de investigación de tesis tiene como objetivo determinar el impacto de la Norma Internacional de Contabilidad N° 23 “Costos préstamos” en la rentabilidad de las universidades privadas con sede en Lima Sur, año 2019. Debido a que, en los últimos años, las entidades de educación superior han obtenido resultados favorables en sus Estados Financieros, en comparación a años anteriores, por ende, han realizado construcciones de nuevas sedes para lograr el licenciamiento otorgado por Sunedu para seguir operando, así como tener un mayor alcance en potenciales alumnos. El trabajo de investigación se encuentra dividido en cinco capítulos que son: Capítulo I Marco teórico, se realiza una investigación, a través de fuentes primarias donde se desarrollan conceptos de las normas internacionales de información financiera (NIIF’s), norma internacional de contabilidad N° 23 “Costos préstamos”, rentabilidad y un análisis del sector educativo. Capítulo II Plan de investigación, se formula la situación problemática de la tesis, el problema principal y específicos, el objetivo general y específicos, hipótesis general y específicos. Capítulo III Metodología de investigación, se definió la población, la muestra para las investigaciones cualitativas y cuantitativas. Capítulo IV Desarrollo de Investigación, donde se realizó la investigación a través de las entrevistas en profundidad, las encuestas y el desarrollo del caso práctico. Capítulo V Análisis de Resultados, en donde el estudio de los instrumentos y el caso práctico son realizados. Se concluye con la validación de la hipótesis general y especificas en base a los resultados obtenidos en las tablas cruzadas y el CHI cuadrado.
Propuesta de aplicación del método de auto-curado adicionando ladrillo triturado al agregado grueso para disminuir las fisuras superficiales y aumentar la resistencia a la compresión del concreto en zonas cálidas (Lima Norte)
Authors:   , Pinchi Morey Sanddy Rocío , Ramirez Mejia Hosvick Jeffer
Published: July 2021

El concreto es uno de los materiales más utilizados en el mundo de la construcción, de las cuales cada material en la mezcla depende de la resistencia que se requiera de acuerdo al análisis estructural. Dentro del proceso de producción de concreto debemos garantizar que el cemento reaccione químicamente y desarrolle la resistencia para la cual fue diseñada, para esto es importante mantenerlo hidratado en ese tiempo mediante el proceso de curado. Una técnica aún no tan conocida es el auto-curado del concreto, por lo cual es una necesidad saber cuál es su influencia en el desarrollo de la resistencia y en la disminución del porcentaje de agrietamiento del concreto en estado plástico. El objetivo de esta tesis es determinar la influencia que tiene el reemplazar un cierto porcentaje de ladrillo triturado como reemplazo del agregado grueso; evaluando la resistencia a la compresión, resistencia a la flexión, y el agrietamiento por contracción plástica del concreto. Se desarrolló con 3 diferentes porcentajes de reemplazo de ladrillo triturado que son: 15%, 21%, 27% del peso del agregado grueso para la resistencia a la compresión (f’c) de 280 kg/cm2. Se concluyó que reemplazo del agregado grueso por ladrillo triturado es efectivo cuando es usado hasta un máximo de 21%. Los resultados obtenidos son óptimos y viables en el tiempo, mostrándonos un aumento en la resistencia a la compresión, resistencia a la flexión y la disminución del porcentaje de fisuras en estado plástico.
Análisis de la adición de cáscara de arroz y bagazo de caña de azúcar en la subrasante de pavimentos para la estabilización de suelos arcillosos en el departamento de San Martín
Authors:   , Hidalgo Ramirez Fernando
Published: July 2021

Esta investigación estudia la adición de la ceniza de cáscara de arroz y bagazo de caña de azúcar en suelos arcillosos para su función como subrasantes en obras de pavimentación. La ceniza de cáscara de arroz y el bagazo de caña de azúcar son residuos orgánicos que se encuentran en mayor cantidad en los departamentos de San Martín y La Libertad respectivamente. De la totalidad de toneladas de cáscara de arroz generadas en el país, alrededor del 20% constituye la ceniza de la cáscara de arroz. Así mismo alrededor del 25% de caña de azúcar producida en el país constituye el bagazo, según el ministerio de agricultura en el 2017. La investigación radica en la búsqueda de métodos alternativos a la estabilización de suelos, para comprobar que estos agregados son viables en su utilización para la estabilización de subrasantes se realizaron en laboratorio ensayos de características químicas, físicas y mecánicas; En diferentes porcentajes para evaluar su respuesta como estabilizadores primarios. Finalmente, la investigación deduce el impacto ambiental ocasionado por nuestra propuesta.
Estudio comparativo de las propiedades técnicas de tres mezclas de concreto empleando materiales reciclados como el POC y caucho en reemplazo parcial de la arena en la ciudad de Pucallpa
Authors:   , Espinoza Trujillo Angela Tatiana , Jimenez Guerrero Benji Boris
Published: July 2021

Actualmente, el sector construcción es uno de los sectores más contaminantes a nivel mundial, es considerado uno de los máximos aportantes de emisiones de carbono. En esta industria se utilizan materiales como el cemento y acero, cuyos elementos son considerados como materiales con alta energía incorporada. La fabricación de estos materiales tiene un impacto considerable de CO2; el cemento por sí solo, representa el 5% de emisiones de CO2 a nivel mundial. También, la industria concretera es responsable de la extracción indiscriminada de recursos no renovables como el agua y agregados, arena y piedra, provenientes de las canteras, graveras, pedregales, etc. La presente tesis tiene como propósito los análisis comparativos de las propiedades técnicas de mezclas de concreto elaboradas con agregados reciclados y/o sub productos de las industrias como el Clinker de aceite de palma (POC) y caucho; con el fin de disminuir la extracción indiscriminada de agregados de las canteras que son utilizados por la industria concretera. Asimismo, reducir la cantidad de CO2 que es producido por la extracción de estos agregados ya que son altamente contaminantes para el medio ambiente. El trabajo de nuestra investigación se basa en realizar 156 probetas de ensayo con agregados reciclados en la mezcla de concreto dando diferentes beneficios estructurales como el incremento de la flexión, compresión y tracción. Se presenta como un proyecto factible que propone una alternativa eco amigable para contrarrestar el impacto ambiental negativo causado por la industria concretera mediante un estudio comparativo de tres mezclas de concreto empleando materiales reciclados como el POC y caucho en reemplazo parcial de la arena.
Análisis de los factores críticos que influyeron en las exportaciones de arándanos de Perú y Chile a Estados Unidos en el periodo 2012-2018
Authors:   , Canales Mendoza Lalesca Patricia , De la Vega García Maricielo Isabel
Published: July 2021

La presente investigación busca determinar y comparar cuales han sido los factores críticos que influenciaron en las exportaciones de arándanos frescos de Perú y Chile a los Estados Unidos, en el periodo 2012 - 2018. En el primer capítulo, se abordarán los antecedentes de la investigación, las bases teóricas de las estrategias de internacionalización, del comercio internacional, del producto elegido y los factores críticos identificados. Además, de la justificación teórica y práctica de la investigación. En el segundo capítulo, se desarrollará el plan de investigación se muestra la situación problemática, las hipótesis y los objetivos generales y específicos en ambos. Adicional a ello, se indicará la relevancia que tiene este estudio. En el tercer capítulo, se explicará la metodología utilizada, diseño aplicado, definición de las variables, tamaño de población y muestra, mediante los instrumentos metodológico escogidos para el recojo de la investigación. También, se hace un recuento de los aspectos éticos que involucran la información. En el cuarto capítulo, se muestra la información relacionada a cómo se desarrollan los cuatro factores críticos en estudio para Perú y Chile; así como, la aplicación de las herramientas escogidas para nuestra investigación, como las entrevistas a profundidad y las encuestas realizadas. En el quinto capítulo, se presenta los hallazgos y resultados de la investigación en relación con la información recopilada cualitativa (entrevistas) y cuantitativa (encuestas) realizadas a los especialistas. Se analiza y evalúa la información obtenida para probar que los factores críticos que se han identificado en el presente trabajo, influyeron en las exportaciones en el período analizado, tanto para el mercado chileno como para el peruano. Finalmente, se muestran las conclusiones y recomendaciones de la investigación realizada, respecto a los factores críticos que influyeron en las exportaciones de arándanos a los Estados Unidos, para luego determinar si se cumplieron los objetivos de la investigación y la hipótesis planteadas.
Analisis Kesalahan Berbahasa Bidang Morfologi dalam Laporan Isu Hoaks Corona Virus oleh KOMINFO
Authors: Agus Tika Dwi Savira  , Sarifah Firda Arindita Nafarin  , Siti Nur Fa’izah
Published: July 2021

This research aims to describe the language errors in the field of morphology, especially in the affixation process and its justification in the Issue Hoax Corona Virus Report by KOMINFO.   The benefit of research is to provide insight and knowledge for readers on the use of good and correct Indonesian in the context of writing. Affixation errors cannot be ignored, because at first glance the error is not visible, but it is very important considering that many readers are interested in explaining the reasons why the corona virus or covid-19 hoax issues. This approach uses descriptive qualitative research methods with data collection techniques refer to, record and take samples. The method used to analyze the data is the aggregate method. The results of this study indicate that there are still many language errors even repeatedly in the report on the issue of corona virus hoaks by KOMINFO. Errors in this study include 8 prefix errors, 0 infix errors, 18 suffix errors and 12 confix errors.This research aims to describe the language errors in the field of morphology, especially in the affixation process and its justification in the Issue Hoax Corona Virus Report by KOMINFO. This approach uses descriptive qualitative research methods with data collection techniques refer to, record and take samples. The method used to analyze the data is the aggregate method. The results of this study indicate that there are still many language errors even repeatedly in the report on the issue of corona virus hoaks by KOMINFO. Errors in this study include 8 prefix errors, 0 infix errors, 18 suffix errors and 12 confix errors.
Association of Quality of Sleep and Decreased Short Term Memory Function in Medical Students of Pelita Harapan University
Authors: Budianto Stevanie , Siahaan Yusak M.T
Published: July 2021

Background: Memory is a place where information is stored from the learning process or experience. There are several types of memory , one of them is short term memory. Declining sleep quality is directly proportional to the decrease in short-term memory. Poor sleep quality is often associated with medical student due to exams or vast amount of tasks. Therefore, researcher wants to see whether there is significant correlation between sleep quality and short-term memory function in students.

Aim: To assess the association of the quality of sleep towards short term memory function of medical student of Pelita Harapan University.

Methods: This study was conducted with a cross-sectional method, with taking sample using the method of a simple random sample. A total of 90 respondents at University of Pelita Harapan were taken. Data collected sorted out according to the inclusion and exclusion criteria. Quality of sleep assessed with PSQI questionnaire while short-term memory assessed by Digit span backward test. Results processed with SPSS version 24 and tested with Chi Square.

Results: Data analyzed by Chi square test showed there are 33 students (58.9%) have poor sleep quality and short term memory function. There are also significant association between the quality of sleep and short term memory function (p value = 0.026)

Conclusion: There is significant association between the quality of sleep and short term memory function of medical students of Pelita Harapan University.
‘Abd al-Karīm al-Jīlī and The Praxis of Ḥadīth
Authors: Lohlker Rüdiger
Published: July 2021

The article provides a study of the use of ḥadīth in the works of al-Jīlī, the author of, e.g., al-Insān al-Kāmil. The article offers a fresh look on the use of ḥadīth in pre-modern Sufi writings. Esp., al-Kahf al-Raqīm a less studied work of al-Jīlī is analyzed. The study will help to precise analysis of ḥadīth in pre-modern times among Sufis. The study is not focused on the criticism of the way Sufis use ḥadīth by ḥadīth scholars. It is a reconstruction of one aspect of the thought and works of al-Jīlī as an exponent of the later school of waḥdat al-wujūd. Thus, it widens the field of ḥadīth studies to other approaches than those shared by ḥadīth scholars. It is the praxis of ḥadīth in Sufi writings that can be studied this way and not claims for authority.
Electoral volatility of the 2019 presidential election: A study in Jakarta and Depok, Indonesia
Authors: Wasisto Aryo
Published: July 2021

In democratic countries around the world, electoral volatility is a challenge for political actors. Because one vote is significant, political parties and candidates are increasingly difficult to predict the preferences of citizens. This study aimed to analyze motivational factors that make voters change their choice of votes. This study employed a quantitative method and proposed three variables, including political sophistication, candidate evaluation, and exposure to media campaigns. The results of the logistic regression show that voters who positively evaluate candidates become loyal voters (p-value £ 0.001). Meanwhile, voters who consume political information from social media and the internet intensively, as well as those who are interested in politics are non-volatile voters (p-value £ 0.001 and p-value £ 0.01, respectively). These findings contrast with studies in parliamentary countries where interest in politics motivates voters to change their votes. In these analyzes, this study focuses on examining the inter-election volatility of 2014-2019 in the context of the presidential election in Indonesia. The data were obtained from a post-2019 election survey (non-probability sampling), for respondents in South Jakarta, East Jakarta, and Depok City, who had elected the president in the 2014 and 2019 elections.
Battery Charger with Bidirectional Power Transmission
Authors: Harnytskyi Andrii V. , Verbytskii Evgenii Volodymyrovych
Published: July 2021

The gradual reduction in price of electric batteries contributes to their wider use in autonomous and centralized power supply systems as a backup source of electricity and increase the share of electric vehicles. In the paper the conditions for increasing the efficiency of electric vehicle batteries, in particular in the framework of the concept of V2G (Vehicle to Grid) as a drive for the organization of autonomous power supply systems are analyzed. It is shown that this is possible only with the simple integration of batteries into the system, flexibility, and a wide range of modes that have to be provided by unified charge-discharge devices. Such charging devices have to have such features: a wide range of input and output voltage parameters; correction of the input power factor; the ability to take the maximum power from renewable energy sources; high energy efficiency. A review of possible topologies for a charger with bidirectional power transmission and a bridge converter with soft switching of transistors at zero voltage, which has a high efficiency, galvanic isolation and the ability to correct the shape of the current. The modes of operation of the converter are analyzed and conditions of soft switching is obtained. It is shown that soft switching is valid for current that is not less than minimal one. Efficiency of the converter with soft commutation is compared with a similar converter with rigid commutation of transistors. It is shown that static losses in converter with soft commutation it higher than in the rigid one. So, the proposed converter should be used if the increase in static losses is compensated by the lack of dynamic losses. Additional feature of the converter is that the regulation of the output voltage of the converter with soft switching is carried out according to the law of frequency-pulse modulation with a constant pause duration, where the pause duration is determined by the period of resonant processes of the converter. The model of the converter in Matlab Simulink is built and it is shown that the efficiency of the proposed converter topology is 10-15% higher, which together with the possibility of sinusoidal current with THD ≈ 20% and two-way transmission energy indicates the feasibility of its use as a charger for electric vehicles under the concept of V2G. However, it should be noted that the use of LCL filter creates a phase shift between voltage and current and degrades the THD value. To improve the shape, it is possible to use specialized laws of modulation [or to use modular converters, which allow to obtain a continuous current shape and reduce the volume of the filter.
Application of the corporate cataloguing technology for the retroconversion of card catalogues
Authors: Stukalova A. A.
Published: July 2021

The corporate cataloguing technology has been widely used in Russian libraries to make bibliographic records (BR) of the electronic catalogue (EC). When selecting the proper sources of BR borrowings, many libraries have managed to reduce time and labor expenditures involved in making EC records. The paper provides examples of the most successful Russian corporate library information systems of the federal and regional level.

At the same time, most libraries have not solved the problem of reflecting information about the entire library stock in EC, which negatively affects the quality of EC services for users. The experience of federal libraries in solving it is considered. The main described methods of retrospective conversion of card catalogues are: manual keyboard entry, scanning of catalogue cards, recognition of scanned cards, BR making, and records borrowing from authoritative sources.

The purpose of this article is to study the effectiveness of using corporate cataloguing technology to perform retrospective conversion of card catalogues. To achieve this goal, the search for bibliographic records of documents published before 1991, and reflected in ECs of the Russian State Library (RSL) and the Russian National Library (RNL), in the LIBNET Corporate Cataloguing System (CCS), in the ARBICON resources and in the IRBIS-corporation was conducted in SPSTL SB RAS EC.

Based on the search result, it has been determined that the most acceptable sources of records borrowing are the electronic catalogues of RSL, RSL and the LIBNET CCS. The advantages and disadvantages of using ready-to-use BRs from the aforementioned sources have been defined. It has been fixed that when choosing the source for borrowing while conducting catalogues retro-conversion, it is necessary to take into account the collection specifics, records compliance with the requirements of a concrete library, compatibility of automated library-information systems, readiness to pay for borrowing services, EC availability, and convenience of search.
Working with readers under quarantine conditions
Authors: Krivec N. V.
Published: July 2021

The main purpose of the article is to present the experience in organizing users’ services at the Universal Literature Circulation Department of the Central Scientific Library (CSL) of the Federal Research Center “Krasnoyarsk Science Center” of the Siberian Branch of the Russian Academy of Sciences (FRC KSC SB RAS) in the period of spring - summer of 2020. Ways of solving the problems that arose in the libraries’ work due to restrictions caused by the COVID-19 pandemic are considered.

During the quarantine period, it became necessary to ensure the return and extension of literature in the conditions of limited contacts between the librarian and the reader. The following mechanisms for solving the problems were proposed: the possibility of remote extension of the period of documents usage with the help of a mobile communication device as well as of books return through the “book-box” at the checkpoint of the FRC KSC. When informing users in a remote mode, telephone calls, SMS and e-mail messages were used.

The preferences of readers when using various communication systems were analyzed: among the subscribers who used the remote method of extending books usage period, about half of the readers used Viber, one third used WhatsApp and about a fifth – e-mail. The efficiency of the work performed was determined: almost all users settled the matters with the library before August 31. At the same time, most of the books were returned or the period of usage was extended. Several reasons for effective work were highlighted: convenience of online renewal; no time limits for returning books; prompt notification of readers about new opportunities. The advantages of the proposed technology (the fulfillment of quarantine requirements, convenience of remote work for readers, and, as a result, promptness of performing actions on their part) and disadvantages (additional work to preserve information when using the employee’s personal smartphone, lack of personal contact between the librarian and the reader are emphasized.

The activity of the Circulation Department is assessed as satisfactory according to the selected set of criteria. The considered method of the Department work, taking into account the quarantine requirements, is recognized as promising.
Timoshenko Beam Theory: Exact Solution for First-Order Analysis, Second-Order Analysis, and Stability
Authors: Fogang Valentin
Published: July 2021

This paper presents an exact solution to the Timoshenko beam theory (TBT) for first-order analysis, second-order analysis, and stability. The TBT covers cases associated with small deflections based on shear deformation considerations, whereas the Euler–Bernoulli beam theory (EBBT) neglects shear deformations. Thus, the Euler–Bernoulli beam is a special case of the Timoshenko beam. The moment-curvature relationship is one of the governing equations of the EBBT, and closed-form expressions of efforts and deformations are available in the literature. However, neither an equivalent to the moment-curvature relationship of EBBT nor closed-form expressions of efforts and deformations can be found in the TBT. In this paper, a moment-shear force-curvature relationship, the equivalent in TBT of the moment-curvature relationship of EBBT, was presented. Based on this relationship, first-order and second-order analyses were conducted, and closed-form expressions of efforts and deformations were derived for various load cases. Furthermore, beam stability was analyzed and buckling loads were calculated. Finally, first-order and second-order element stiffness matrices were determined.
Editorial: A Revista História Hoje e os 60 anos da ANPUH-Brasil
Authors: Ribeiro Renilson Rosa , Da Silva Mônica Martins
Published: July 2021

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