bluuebunny/crossref_metadata_2025 huggingface dataset:
Sparse Signature Matrix Optimization for NOMA under Imperfect CSI
Authors: Lu Kun , Yang Hongwen
Published: May 2021

Non-orthogonal multiple access (NOMA) can support the rapid development of the Internet of Things (IoT) with its potential to support high spectral efficiency and massive connectivity. The low-density superposition modulation (LDSM) scheme is one of the NOMA schemes and uses the sparse signature matrix to reduce multiple access interferences (MAI). In order to improve the NOMA system performance in practice, this paper focuses on designing the sparse signature matrix with a large girth for LDSM under imperfect channel state information (CSI). Based on the orthogonal pilot and linear minimum mean square error (LMMSE) estimation, the LDSM optimized by bare-bone particle swarm optimization (BBPSO) algorithm has a larger girth and can gather more accurate information in the process of iterative decoding convergence. An extrinsic information transfer (EXIT) chart analysis is designed for the LDSM-OFDM system as a theoretical analysis tool. The simulation results show that the optimized LDSM outperforms the reference LDSM system, bringing about a 0.5 dB performance gain.
Towards A Sustainable Green Design for Next-Generation Networks
Authors: Alimi Isiaka Ajewale , Patel Romilkumar K. , Mufutau Akeem O. , Muga Nelson J. , Pinto Armando N. , Monteiro Paulo P.
Published: May 2021

The evolution in the Information and Communications Technologies industry results in excessive energy consumption and carbon dioxide emission in the wireless networks. In this context, energy efficiency in mobile networks has been attracting considerable attention as green communications and operational expenditures reduction depend on it. Although the Internet of Things is to be supported by devices that are low-energy consuming, the power consumption of the huge number to be connected for several applications and services demand significant attention. To offer insights into green communications, this paper reviews various energy efficiency improvement techniques. Also, we consider a hybrid model in which the main grid power and dynamically harvested green energy from renewable energy sources can be leveraged to support the energy demand of the radio access network. In this regard, we reformulate the energy consumption model and consider an energy-efficient power allocation algorithm for green energy optimization. Numerical results show that with resource allocation algorithm exploitation, the energy efficiency can be enhanced. Besides, the amount of the grid energy consumption can be considerably minimized, resulting in the greenhouse gas emissions reduction in the wireless networks.
Laser Projector Method for Measuring Postoperative Acetabular Anteversion After Total Hip Replacement
Authors: Chen Wei-Cheng , Wu Tai-Yin , Chi Kuan-Yu , Weng Pei-Wei , Huang Yu-min , Lin Feng-Huei , Liaw Chen-Kun
Published: May 2021

Introduction For patients undergoing total hip replacement (THR), measuring the postoperative acetabular anteversion precisely plays a pivotal role in the prognosis because anteversion of acetabulum cup determines the range of motion and stability after the THR. To date, the documented techniques for the accurate assessment encompass methods of two-dimensional (2D) and three-dimensional (3D). Our team has developed several 2D methods for precisely measuring acetabular anteversion after the THR, namely the trigonometric, the protractor, and the computerized ellipse method. Despite multiple commercially available assessing tools, most mandate computerized equipment with corresponding software that is frequently in shortage in remote areas and developing countries. Therefore, we attempted to invent a laser projector that is able to measure the acetabular anteversion directly on the traditional plain film and to examine its validity and consistency by comparison with the Elliversion software.Methods We invented a portable laser projector incorporating the ellipse method for the measurement of postoperative acetabular anteversion. We retrospectively collected 50 postoperative pelvis radiographs including acetabulum from our institution. One investigator first measured the anteversion of included radiographs through Elliversion software as the control group. Subsequently, two operators independently used the laser projector for measurements in two separate periods with 1-day intervals as the experimental group. Our analysis was comprised of intra- and inter-group comparisons, which investigated the consistency and validity, respectively, by using two-sample student’s t-test. P-value < 0.05 suggests statistical significance. Results There was no significant difference in measuring the anteversion through laser projectors between two operators (MD, -0.12; 95% CI, -0.52 to 0.27; p=0.54). The estimated effect in the anteversion measurement between the Elliversion and laser projector was also comparable (MD, -0.17; 95% CI, -0.38 to 0.04; p=0.12).Conclusions Our study reported the consistency and validity of this laser projector as there is no significant difference in both intra- and inter-observer reliability, demonstrating real-time, intuitive, and convenient product design comparing to Elliversion. Most importantly, we look forward to helping elevate clinical acumen when doctors provide care to patients after THR, especially in remote areas.
Risk factors and mitigation measures in public-private water sector partnerships: lessons from the Asutifi North District, Ghana
Authors: Agbemor Benjamin Dawurah , Smiley Sarah L.
Published: May 2021

Public-private partnerships (PPPs) are promoted as a practical option for developing countries to meet their water sector infrastructure gaps. Despite their appeal, PPP projects have been described as complex and challenging, and the water sector PPPs are particularly associated with high failure rates. Risk analysis and evaluations have been identified as critical to the success of PPPs. In this paper, we examine an on-going PPP arrangement for piped water supply in the Asutifi North District of Ghana under a Build, Operate, and Transfer arrangement. Safe Water Network will provide the supply systems and transfer ownership to the District Authority at the end of the contract. We reviewed key project documents to ascertain the measures that would minimize the likelihood of risk occurring during the project cycle. Of 11 risk factors, 7 were anticipated in the project documents. We recommend that project documents be reviewed and amended to address the unanticipated risks.
Assessing desertification sensitivity map under climate change and agricultural practices scenarios: the island of Crete case study
Authors: Morianou G. , Kourgialas N. N. , Pisinaras V. , Psarras G. , Arambatzis G.
Published: May 2021

The aim of this study is the assessment of desertification risk for a typical Mediterranean island, in the frame of climate change and the application of good agricultural practices. Based on the MEDALUS Environmentally Sensitive Area Index (ESAI) approach, the sensitivity in desertification is estimated by employing 15 quantitative parameters divided in to four main quality indices: climate, vegetation, soil, and management quality. The methodology applied for a baseline scenario (current conditions), two future climate change scenarios (RCP 4.5 and RCP 8.5) and a soil quality improvement scenario. According to the results, more than 13% of the island's area is characterized as critically sensitive to desertification in the current conditions. This percentage will increase in the future under both the RCP 4.5 and the RCP 8.5 climate scenarios, where the critical areas will rise above to 15%. By applying the soil quality improvement scenario simultaneously with the climate change scenarios, a slight mitigation of desertification risk in the future could be achieved. The methodology developed in this study may be used to assess desertification process under various climate, soil, and land use management scenarios in regions of the Mediterranean Sea.
Alkaline and acid solubilisation of waste activated sludge
Authors: de Sousa Tales Abreu Tavares , do Monte Fernanda Patrício , Silva José Vanderley do Nascimento , Lopes Wilton Silva , Leite Valderi Duarte , van Lier Jules B. , de Sousa José Tavares
Published: May 2021

The influence of acidic and alkaline conditions on the solubilisation process of waste activated sludge (WAS) was investigated using HCl and NaOH at pH 2, 10, 11 and 12. The rise in concentration of solubilised compounds, the influence of reaction time, and the influence of the concentration of total solids (TS) during the solubilisation process were determined. Physical and chemical tests demonstrated that pre-treatment provided a release of compounds from the sludge floc matrix into the soluble fraction, characterising the solubilisation process. The highest degree of WAS solubilisation was observed when a pH of 12 was applied. Although largest effects were already attained after 0.25 h, WAS solubilisation continued reaching an increase in total dissolved solids by a factor 10.4 after 720 hrs. Under these conditions, the dissolved organic carbon (DOC), proteins, and carbohydrates resulted in releases up to 15, 40 and 41 times, respectively; phosphorus increased 5.7 times. Results indicate that by applying alkaline pre-treatment, higher TS concentrations can be treated per reactor volume compared to non-pre-treated WAS. Aerobic and anaerobic biodegradability tests showed increased bioconversion potentials in full-scale treatment plants. The respirometry tests ratify the improvement in solubilisation, with O2 consumption rates increasing 1.4 times, concomitant with an additional 261 mg·L−1 of the COD used, which represents 90% bioconversion of waste activated sludge. Biomethanisation test indicated an increase of 3.6 times relative to the blank.
Hubungan Sosialisasi Gender dalam Keluarga dengan Persepsi Gender Siswa SMK
Authors: Ramadhani Amalia Nur
Published: May 2021

Artikel ini menjelaskan hubungan sosialisasi gender dalam keluarga dengan persepsi gender siswa SMK. Penelitian ini dilakukan dengan menggunakan metode survei di salah satu SMK di Purbalingga, Jawa Tengah. Populasi penelitian ini adalah siswa SMK yang berjumlah 498 siswa, dan sampel diambil dengan metode acak sederhana sebesar 30% dari total populasi. Hasil penelitian menunjukkan nilai korelasi tau kendall kedua variabel tersebut sebesar 0,14 dengan nilai signifikansi 0,07. Hal ini berarti terdapat hubungan positif antara sosialisasi gender dalam keluarga persepsi gender responden. Aktivitas yang dilakukan responden bersama orang tua menjadi kesempatan berlangsungnya sosialisasi gender dalam keluarga. Hal tersebut menjadi salah satu sarana pembentukan persepsi gender responden. Ketika orang tua memperlakukan anak laki-laki dan perempuan secara berbeda, maka hal tersebut dapat membentuk persepsi bahwa keduanya adalah berbeda. Nilai korelasi antara variabel sosialisasi gender dalam keluarga dengan persepsi gender responden adalah sangat rendah, sehingga dapat dikatakan bahwa sosialisasi gender dalam keluarga bukanlah faktor dominan yang membentuk persepsi gender responden. Ada faktor lain yang turut menentukan persepsi ini, di antaranya: sosialisasi di sekolah, sosialisasi dengan teman sebaya, lingkungan masyarakat berdasarkan budaya termasuk media massa.
LA INVESTIGACIÓN: REQUISITO PARA EL AVANCE DE LA CALIDAD EN LAS UNIVERSIDADES PERUANAS
Authors: Árias Muñoz Mónica Patricia
Published: May 2021

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RESULTADOS DE UN ESTUDIO SOBRE CONCEPCIONES DEL PROFESORADO EN ACTIVIDAD Y EN FORMACIÓN EN ESPAÑA
Authors: Sanchis Borrás José María , Clément Pierre , Barberá Marco Óscar
Published: May 2021

El proyecto de investigación europeo Biohead-Citizen (2004-2008), desarrolló un estudio sobre concepciones del profesorado atendiendo a aspectos de biología, salud y educación ambiental para promover una mejor ciudadanía, incluyendo las dimensiones social y afectiva. Para ello, aplicó un cuestionario a profesorado de los diversos países objeto de estudio. Nuestro trabajo intenta sumar datos de profesorado español a los ya obtenidos en dicho proyecto que hasta este momento reúne información de más de 30 países de todos los continentes. Para ello, mediante la aplicación del mismo cuestionario, se han analizado las concepciones de 318 profesores y futuros profesores españoles a partir de sus respuestas a las preguntas de dicho cuestionario relativas, en este caso, a la evolución biológica. Diversos análisis estadísticos multivariantes muestran el grado de aceptación de la evolución biológica de nuestros docentes, así como las correlaciones existentes entre el rechazo y determinados factores de tipo ideológico y/o religioso. Además, los datos obtenidos en España han venido a sumarse a los correspondientes a otros países, integrándose en un estudio comparado entre países. Que muestra que los docentes españoles son, al igual que sus colegas franceses, daneses, suecos y estonios, los más evolucionistas entre los 30 países estudiados.
EL APORTE DEL EMPRENDIMIENTO SOCIAL A LA EDUCACIÓN MEDIA TÉCNICA
Authors: Cadena Luisa Fernanda
Published: May 2021

El presente artículo recoge algunos de los principales resultados generados de la investigación ejecutada en el periodo 2014-2017 en 4 instituciones de educación media técnica del sector oficial en la ciudad de Bogotá, en la que se pretendió comprender el impacto de las políticas de articulación de la media t y la formación en emprendimiento que desde el Ministerio de Educación Nacional hacen parte del Proyecto Educativo Institucional (PEI) de las instituciones que tienen en su modelo educativo la formación media técnica. Esta indagación se conduce bajo la mirada del desarrollo del pensamiento complejo en la escuela y con ella se quiso conocer como impactaba en el desempeño de los egresados de la formación media en articulación y la implementación de  las dos políticas públicas que se plantean para mejorar la formación del futuro egresado como bachiller técnico para el ingreso al sector productivo o bien para su paso a la formación superior.   En cuanto a la metodología desarrollada en el estudio, la investigación fue  de carácter cualitativo, con enfoque descriptivo.Para organizar y analizar la información obtenida se realizó el proceso metodológico de triangulación, con el objetivo de darle la rigurosidad científica a los resultados de la investigación recogidos desde los diferentes actores, mediante el análisis de los resultados arrojados.En conclusión, la investigación entregó entre otros aportes una serie de componentes  para generar un proyecto de aula a partir del desarrollo de competencias en emprendimiento social.Palabras Clave: Educación media, política  de articulación, sector productivo, pensamiento complejo, competencias.
COMPROMISO ORGANIZACIONAL DESDE LA PERSPECTIVA DEL PERSONAL DOCENTE
Authors: Atencio Bravo Eduardo Alfonzo
Published: May 2021

La presente investigación se realizó con el objetivo fundamental de describir el nivel de compromiso organizacional desde la perspectiva del personal docente de la Institución Educativa Mata de Plátano del Municipio Canalete, Colombia. Teóricamente el estudio se apoyó en los planteamientos de Meyer y Allen (1997), Rivera (2010), De la Puente (2017), entre otros. Con respecto a la naturaleza de investigación, se asumió desde el paradigma positivista de enfoque cuantitativo, mediante un tipo de investigación descriptiva con diseño no experimental y de campo. Para la recolección de datos se aplicó un cuestionario de opciones múltiple a una población censal conformada por 18 sujetos. La validez del instrumento en mención se realizó a través de la técnica juicio de experto, y el cálculo de la confiabilidad mediante el coeficiente Alpha de Cronbach, el cual arrojó 0,90. Los resultados obtenidos evidenciaron que los docentes de la institución educativa objeto de estudio tienen un nivel medio de compromiso organizacional en su dimensión afectiva y un nivel alto en las dimensiones de continuidad y normativo. De igual forma, los hallazgos demostraron que existe un nivel bajo en los indicadores de satisfacción laboral y reputación de la institución.
La matrícula ante la política educativa: el caso de la Universidad Autónoma de Guerrero, México
Authors: Garduño Teliz Elvia , Reyes Carreto Ramón
Published: May 2021

El objetivo del estudio es analizar la matrícula de Educación Media Superior (EMS) y Educación Superior (ES) en los últimos seis ciclos escolares para establecer propuestas que contribuyan a ampliar la cobertura  de la oferta educativa en la Universidad Autónoma de Guerrero (UAGro).  A partir de aplicar una metodología cuantitativa se realizó un análisis entre los datos establecidos en el Anuario Estadístico institucional y los presentados por el Instituto Nacional de Estadística y Geografía (INEGI) relativos a la población objetivo del derecho a la educación EMS y ES en  las siete regiones del estado de Guerrero.Los resultados demuestran que la actual y  nueva oferta educativa  de la UAGro no ha tenido un impacto significativo en el crecimiento de su matrícula.  Ante esto, se genera una serie de propuestas orientadas a modificar las políticas institucionales con miras a ampliar  la  matrícula y la cobertura.
EDUCACIÓN VIRTUAL INTERACTIVA COMO METODOLOGÍA PARA LA EDUCACIÓN: REVISIÓN DE LITERATURA
Authors: Bullón Solís Omar
Published: May 2021

El servicio educativo, en todos sus niveles, migró a la modalidad virtual como medio para continuar operando durante el estado de emergencia sanitaria, producto de la pandemia del COVID 19. Sin embargo, su implementación fue acelerada y en múltiples casos quedó pendiente la formulación y evaluación de las metodologías didácticas adaptadas al nuevo entorno virtualizado. Este trabajo presenta el análisis y la revisión bibliográfica de la implementación de herramientas tecnológicas en el proceso de virtualización de la educación y la respuesta metodológica del docente; para lo cual se empleó el enfoque cualitativo y el método de estudio fenomenológico. El objetivo fue indagar sobre la implementación de las plataformas educativas digitales en las instituciones educativas y la respuesta adaptativa de la comunidad estudiantil. Se encontró que las plataformas educativas son la principal herramienta tecnológica de las instituciones educativas, sin embargo no se realizó la adecuación pedagógica para emplear correctamente estas tecnologías digitales. Se identificó que los docentes requieren dominar el uso de las TIC como herramientas educativas para brindar una enseñanza adecuada a los requerimientos de la sociedad moderna. Se evidenció que la metodología interactiva permite aprovechar las ventajas de las plataformas educativas, por lo que se sugiere como metodología adecuada para la educación virtual.
DESARROLLO DE LAS COMPETENCIAS DIGITALES EN LOS DOCENTES UNIVERSITARIOS EN TIEMPO PANDEMIA: UNA REVISIÓN SISTEMÁTICA
Authors: Rambay Tobar Monica Graciela , De la Cruz Lozado Juan
Published: May 2021

El presente artículo tiene como objetivo analizar en las evidencias científicas el desarrollo de las Competencias Digitales en los Docente Universitario, quienes se vieron obligados a replantear sus programas de estudios en un entorno virtual debido a la pandemia mundial de la COVID-19. La búsqueda se realizó utilizando las bases de datos científicas Scopus, ProQuest, Ebsco, así como la aplicación web Mendeley. Se incluyeron artículos que identificaban las competencias digitales en  docentes universitarios en el presente año. Se excluyeron estudios realizados en instituciones de educación primaria y secundaria. Como conclusiones se establecen que será necesario elaborar un plan de fortalecimiento para las competencias docentes que no se han desarrollado satisfactoriamente, especialmente las relacionadas con el rol del docente (planificación, desarrollo, conducción de experiencias de aprendizaje presenciales con TIC), la creación del contenido digital, y la seguridad.
Comparing Two Commercially Available Diabetes Apps to Explore Challenges in User Engagement: Randomized Controlled Feasibility Study
Authors: Maharaj Alita , Lim David , Murphy Rinki , Serlachius Anna
Published: May 2021

Background

Diabetes apps represent a promising addition to face-to-face self-management interventions, which can be time and resource intensive. However, few randomized controlled trials have evaluated the efficacy of diabetes apps, in particular as a stand-alone intervention without additional clinical support.

Objective

We used a feasibility randomized trial design to investigate differences in user engagement between 2 commercially available apps (free versions of Glucose Buddy and mySugr) over 2 weeks in adults with type 2 diabetes. Feasibility was assessed based on recruitment uptake, adherence to the diabetes apps, and follow-up rates. We also hypothesized that the diabetes app mySugr would demonstrate higher user engagement at follow-up due to its use of gamification. We also predicted higher user engagement would be associated with improved self-care behaviors and illness beliefs.

Methods

Adults with type 2 diabetes attending outpatient diabetes clinics in Auckland were recruited and randomized (1:1 without blinding) to use either the Glucose Buddy or mySugr diabetes apps. User engagement, self-care behaviors, and illness beliefs were measured 2 weeks after baseline. Spearman rank correlations, Mann-Whitney tests, and Wilcoxon signed-rank tests were used to explore associations between the outcome measures and to investigate possible changes between and within groups. Six participants were interviewed to further explore acceptability and usability.

Results

In total, 58 participants (29 per group) completed the 2-week follow-up, of whom only 38 reported using the apps (Glucose Buddy: n=20; mySugr: n=18). Both groups reported low engagement (Glucose Buddy: median 4 days; mySugr: median 6.5 days; P=.06; use for both groups: median 10 minutes). No changes were observed in self-care or illness beliefs in either group. Out of the self-care behaviors, only blood glucose testing was significantly associated with minutes of app use (P=.02). The interviews suggested that although both apps were deemed acceptable, they were generally viewed as time-consuming and too complicated to use.

Conclusions

Low engagement with both Glucose Buddy and mySugr reflect the challenges associated with engaging users with diabetes apps. Due to low engagement and loss to follow-up, the changes in outcome measures should be interpreted with caution. The results highlight the need for more clinical support as well as involvement from end users and behavior change specialists in order to incorporate evidence-based behavior change techniques to motivate and provide value to users.

Trial Registration

Australia New Zealand Clinical Trials Registry ACTRN12618000424202; https://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?id=374671
СТАРЫЕ И НОВЫЕ ИДЕИ В СПУТНИКОВОЙ СВЯЗИ
Authors: Урличич Ю.
Published: May 2021

В области космических телекоммуникационных технологий иногда проблематично отделить рекламные наслоения от реальности. Статья посвящена анализу развития традиционных и новых направлений спутниковой связи и попытке их объективного осмысления в среднесрочной перспективе.
МЫ ОРИЕНТИРУЕМСЯ НА АБОНЕНТОВ, ПРЕДПОЧИТАЮЩИХ ВЗВЕШЕННЫЙ ПОДХОД К ТРАТАМ
Authors: Мельников А.
Published: May 2021

В 2020 году группа MCN Telecom, федеральный оператор местной, МгМн-связи, виртуальный мобильный оператор (MVNO), разработчик программных телеком-продуктов, отметила 20-летний юбилей. Осенью того же года компания, которая с момента создания концентрировалась на рынке B2B, впервые начала предоставлять услуги своей мобильной сети и частным пользователям. Сегодня MCN Telecom, по данным аналитиков, активнее всех в стране расширяет территориальный охват сети MVNO. О сегодняшнем дне и планах развития компании, работающей на телеком-платформе собственной разработки, мы попросили рассказать генерального директора Группы компаний MCN Telecom Александра Мельникова.
Jóvenes universitarios y la Covid-19: una mirada desde la categoría de acontecimiento
Authors: Tavera-Fenollosa Ligia , Martínez Carmona Carlos Arturo
Published: May 2021

El objetivo de este trabajo es dar cuenta de cómo han vivido la pandemia los estudiantes que iniciaron su vida universitaria en tiempos de pandemia por la Covid-19, en particular de aquellos inscritos a la Facultad de Ciencias Políticas y Sociales (FCPyS) de la UNAM, a nueve meses de que se declarara la emergencia sanitaria. Para ello recurrimos a la categoría de acontecimiento entendido como una ruptura instauradora a nivel de la temporalidad, la inteligibilidad y la experiencia. Seguimos una metodología mixta que consistió en la aplicación de un cuestionario a una muestra representativa de universitarios y en la realización de un grupo focal. Encontramos que los quiebres más radicales y profundos se han dado a nivel de la experiencia y muy particularmente en la dimensión emocional, con importantes huellas en el ámbito de la socialidad y la sociabilidad. Pero también identificamos una serie de aprendizajes y habilidades desarrolladas por los jóvenes a partir de la pandemia. Finalmente, a diferencia de las visiones que culpabilizan a las juventudes de la expansión de los contagios, encontramos que, en términos generales, los jóvenes universitarios no sólo acatan las disposiciones oficiales —incluso más que sus familiares—, sino que, además, vinculan el seguimiento de las normas a su condición universitaria, a pesar de no haber pisado el campus todavía.
¿Crisis epocal? Apuntes para una reflexión
Authors: Waldman Gilda
Published: May 2021

Vivimos hoy tiempos convulsos y vertiginosos, en el que también se van desplomando los cimientos, coordenadas, ejes y paradigmas, así como los marcos organizativos, valóricos y normativos, que construyeron y organizaron la vida política, social y cultural a lo largo de los últimos siglos, al tiempo que nos adentramos en un nuevo e inesperado escenario, cuyo horizonte de futuro es aún nebuloso. La desconfianza ante el futuro ha reactivado la añoranza por un tiempo, un lugar o un hogar perdidos que han dejado de existir, o que quizá no existieron nunca (Boym, 2015) y que se idealizan como un paraíso perdido o inalcanzable (Boym, 2015; Bauman, 2017).
Elemento traza: contaminación y valores de fondo en aguas subterráneas de San Luis Potosí, SLP, México
Authors: Cardona B. Antonio , Carrillo R. J. Joel , Armienta H. M. Aurora
Published: May 2021

Es una práctica relativamente común en nuestro país, el definir como agua contaminada aquella cuya concentración de una o varias especies químicas es mayor que el límite máximo recomendado por los estándares nacionales e internacionales. Esta consideración es errónea pues no distingue entre dos conceptos fundamentales: i) agua de mala calidad (natural) y ii) agua contaminada (efectos antropogénicos). Se propone el concepto VALOR de FONDO para una especie disuelta en agua subterránea, como la concentración en un determinado punto del sistema de flujo, debida única y exclusivamente a procesos y reacciones químicas naturales entre el agua subterránea y los minerales del acuífero; es función de la mineralogía de la roca, conductividad hidráulica, porosidad efectiva y patrón de flujo subterráneo. En el caso de ciertos elementos traza como Zn, Li, F, B y Fe,
Análisis geoquímico-isotópico de las especies carbónicas del fluido geotérmico de los Humeros, Puebla, México
Authors: González-Partida E. , Barragan-R R. M. , Nieva-G. D.
Published: May 2021

Evidencias geoquímicas muestran que los fluidos del yacimiento de Los Humeros presentan un exceso de vapor con mezcla de un fluido agresivo proveniente de un segundo yacimiento y sólo los pozos someros como el H-1 no son afectados por tal fenómeno. Datos de composición química de salmuera del pozo H-1 fueron utilizados para estudiar el fenómeno de ebullición a condiciones de yacimiento y repercusión en la formación de calcita. Los resultados muestran que aún a pequeños porcentajes de ebullición (5 a 100 0/00) el ácido carbónico disminuye su actividad en el fluido residual propiciando la precipitación de calcita y desprendiendo dióxido de carbono hacia niveles más someros. La distribución espacial de calcita está caracterizada por un progresivo incremento de isotópos ligeros hacia los niveles más someros del yacimiento, mientras aquellos que se formaron a mayores profundidades son valores promedio de Î´13C 0/00 = -0.36 se confunden con los valores isotópicos que muestran las calizas del basamento sedimentario cuyo valor es de Î´13C =0.3 lo que permite su relación genética.
Pliocene to Holocene volcanic geology at the junction of Las Cruces, Chichinautzin and Ajusto ranges, southwest of Mexico City
Authors: Delgado Granados Hugo , Martin del Pozzo Lillian
Published: May 2021

El trabajo está enfocado al estudio de la estratigrafía de una pequeña área volcánica al sur de la ciudad de México, apotando información volcanológica y tratando de respetar la formalidad estratigráfica. Entre el Plioceno Tardío y el Holoceno ocurrieron tres diferentes periodos de colvanismo en la región donde se unen las sierras de Las Cruces, el Ajusco y Chichinautzin. El período más antiguo, denominado Período Aruptivo Las Cruces, está representado por la actividad del volcán poligenético Los Picachos consistente de flujos piroclásicos dacíticos, lahares y lavas de la Formación de Las Cruces (constituído de los dos miembros: Brecha Piroclásica Cantimplora y Lava Dacítica Apilulco), formada principalmente durante el Plioceno Tardío-Pleistoceno Temprano. Durante el Período Eruptivo Ajusto (Pleistoceno Medio), el volcán Ajusco se formó por el emplazamiento de varios domos de lava andesítica. La última etapa eruptiva en la región fue el Periódo Eruptivo Chichinautzin (volcanismo monogenético desarrolladao durante el Pleistoceno Tardío y el Holoceno), de naturaleza estromboliana. Los conos de escoria y de lava que fueron formados en este período, constituyen a las diferentes unidades del Grupo Chichinautzin. Los volcanes Los Picachos, Ajusco, Panza y conos asociados están alineados sobre un sistema de fractura N65° W (activo desde el Plioceno Tardío). Varias fallas normales son paralelas a este alineamiento. Glaciares correspondientes a las glaciaciones Santo Tomás y Albergue dejaron "cuernos", valles en forma de "U", circos y morrenas en los volcanes Los Picachos y Ajusco. El volcanismo del período Eruptivo Chichinautzin fue contemporáneo con un período interglacial durante el Pleistoceno Tardío (entre las glaciaciones Santo Tomás y Albergue).
Antibody response after one and two doses of the BNT162b2 vaccine in nursing home residents: The CONsort-19 study
Authors: Bousquet Jean , Blain Hubert , Tuaillon Edouard , Gamon Lucie , Pisoni Amandine , Miot Stephanie , Rolland Yves , Picot Marie-Christine
Published: May 2021

Methods: Twenty-two French nursing homes were included. COVID-19 had
been diagnosed with real-time reverse-transcriptase polymerase chain
reaction (RT-PCR) for SARS-CoV-2. Blood S-protein IgG and nucleocapsid
(N) IgG protein (N-protein IgG) were measured 21-24 days after the first
jab (1,004 residents) and 6 weeks after the second (820 residents).
Results: Among the 735 residents without prior COVID-19, 41.7% remained
seronegative for S-protein IgG after the first jab vs 2.1% of the 270
residents with a previous positive RT-PCR (p<0.001). After the
second jab, only 3% of the 586 residents without prior COVID-19
remained seronegative. However, 26.5% of them had low S-protein IgG
levels (50-1050 UA/mL) vs 6.4% of the 222 residents with prior
COVID-19. Residents with old infection (first wave), or seropositive for
N-protein IgG at the time of vaccination, had the highest S-protein IgG
levels. Residents with a prior COVID-19 infection had higher S-protein
IgG levels after one dose than those without two jabs. Interpretation: A
single vaccine jab is sufficient to reach immunity in residents with
prior COVID-19. Most residents without prior COVID-19 are seropositive
for S-protein IgG after the second jab, but around 30% have low levels
of S-protein IgG. Whether residents with no or low post-vaccine immunity
are at higher risk of symptomatic COVID-19 requires further analysis.
Statin Withdrawal and Treating COVID-19 Patients
Authors: Fedson David
Published: May 2021

Most but not all observational studies of statin treatment of COVID-19
patients suggest that treatment improves outcomes. However, almost all
observational studies fail to consider what cardiovascular investigators
have known for 15-20 years: withdrawing statins after hospital admission
has detrimental effects on patient outcomes. Continuing (or starting)
statin treatment after hospital admission consistently improves COVID-19
patient outcomes, whereas discontinuing treatment does not. Thus,
observational studies of the effectiveness of statin treatment of
COVID-19 patients must consider the consequences of statin withdrawal.
Prognostic value of geriatric nutritional risk index for aspiration pneumonia: a retrospective study
Authors: Araki Taisuke , Yamazaki Yoshitaka , Goto Norihiko , Takahashi Yuko , Ikuyama Yuichi , Kosaka Makoto
Published: May 2021

Background/Objectives: The clinical characteristics and prognostic
factors of aspiration pneumonia remain poorly defined. Geriatric
nutrition risk index (GNRI) has recently been reported to exhibit a
prognostic value for several diseases in older adults. Thus, we aimed to
investigate the clinical characteristics and prognostic significance of
GNRI for aspiration pneumonia in a sample of older adult patients.
Design: Retrospective observational cohort study. Setting:
Single-institute acute-phase community hospital. Participants: Patients
with aspiration pneumonia diagnosed at our institute between April 2014
and March 2016. Measurements: Data on patient characteristics,
microbiological findings, and clinical course were extracted from
electronic medical records. The primary outcome was in-hospital
mortality. Receiver operating characteristic curve (ROC) analysis was
conducted to compare the predictive value of each parameter. Logistic
regression analysis was performed to identify independent prognostic
factors. Results: Overall, 587 patients with aspiration pneumonia aged ≥
65 years were enrolled. The mean age was 86 years. Among the patients,
97 patients (16.5%) died. ROC analysis for in-hospital mortality
revealed that GNRI had a greater area under the curve value than
albumin, body mass index, and A-DROP score, with a significant
difference between GNRI and albumin (p=0.0058). Male gender sex (odds
ratio [OR]: 1.88, p = 0.028,), chronic heart failure (OR: 2.14, p =
0.023), history of malignancy (OR: 2.66, p = 0.0025), lower GNRI (OR:
0.94, p < 0.001), and initial antibiotic change (OR: 4.22, p
< 0.001) were identified as independent adverse prognostic
factors in the multivariate analysis. Conclusion: Our findings indicate
that GNRI is a potential prognostic marker for older adults with
aspiration pneumonia and may act as a proxy for disease severity. Our
results support the use of GNRI in the clinical management of aspiration
pneumonia.
Transversal Skills in Mathematics Curriculums of Latvian Secondary Education: 1940-2020
Authors:   University of Latvia, Lama Gatis , Andersone Rudite ,   University of Latvia
Published: May 2021

Digital technologies are rapidly changing our daily lives and work environment, encouraging the review of current curriculums in schools. The implementation of the new curriculum in Latvian schools begins on September 1st, 2020. As transversal skills as a term are included for the first time, teachers feel confused regarding the inclusion of such skills in the learning process and the implementation of experience in practice in the new context, simultaneously raising doubts about their professional capacity in practice, teachers are guided by the requirements of the curriculum. The study focuses on the analysis of 11 secondary school mathematics curriculums, using document analysis. The aim of the research is to analyse transversal skills and their development in secondary school mathematics curriculums, by analysing various mathematics curriculums in Latvia from 1940 to 2020. It is essential to accentuate the importance of transversal skills and content that has assisted in the development of transversal skills in earlier teaching practice, to aid teachers in choosing methods and activities that are applicable, as well as necessary changes to achieve new education goals. The research results indicate that transversal skills have been essential in previous mathematics curriculums. The most important transversal skills that have been highlighted in all analysed curriculums are thinking skills, skills that are necessary for individual work and career skills. The new challenges are related to transversal skills that are required for civic activity, the use of different learning methods and lifelong learning.
Efficiency of calcium hydroxide removal techniques from simulated internal resorptions - in vitro study
Authors: Opacic-Galic Vanja , Veljovic Djordje , Neskovic Jelena , Milosevic Vesna , Ilic Veljko
Published: May 2021

Introduction/Objective. Calcium hydroxide (CH) is the medicament of choice in endodontic treatment of internal root resorptions. The aim of the study was to compare the effectiveness of three different techniques for CH removal from simulated internal root resorptions. Methods. Twenty-nine extracted single-root teeth were prepared using NiTi rotary files of BioRaCe system (40/.04) following irrigation. A round diamond drill was used in the making of a symmetrical standardized internal resorptions 6 mm from the apex. Three techniques for CH removal from internal resorptions were tested: modified conventional syringe irrigation (CSI), passive ultrasonic irrigation (PUI), XP-endo Finisher (XP). Resorptive cavities and apical thirds were observed under a stereomicroscope (?45) and scored (from 1 to 5), while representative samples were analysed by a scanning electron microscope. Obtained results were statistically processed by Kruskal?Wallis and Mann?Whitney U-test (p < 0.05). Results. The most efficient system was PUI, with 66.7% of samples rated 1 and 33.3% rated 2. The next one was XP, and the least efficient was CSI, with 33.3% of samples rated 1 (resorptive defect without medicament). There was a statistically significant difference between the PUI and CSI systems (p < 0.05), while there was no difference between the PUI and XP systems. Conclusion. No system completely removed the CH from the simulated internal root resorption cavities. PUI was the most effective system for removing CH. The combination of techniques provides better performance in removing CH paste residues from the canal walls
Peramalan Beban pada Gardu Induk Mantingan dalam Penentuan Kapasitas Transformator dengan Metode Regresi Linear
Authors: Jimmy Trio Putra  , Fadhilah Nisaun , Arrofiq Muhammad
Published: May 2021

Intisari — Pertumbuhan beban kelistrikan di wilayah Ngawi dan Magetan meningkat seiring rencana pemerintah dalam membangun beberapa infrastruktur dan kawasan industri.  Penyedia kelistrikan harus mampu memprediksi kemampuan sistem dalam melayani konsumen. Perencanan pembangunan Gardu Induk (GI) memiliki tujuan dalam memastikan persebaran semua beban listrik yang dilayani dapat diakomodasi dengan baik. Penelitian ini menggunakan data historis dalam memprediksi besarnya permintaan kelistrikan di area GI Mantingan tahun 2019 hingga tahun 2026. Metode yang digunakan adalah metode regresi linear dengan perencanaan satu tahap, yaitu periode 8 tahun (jangka panjang). Hasil penelitian merekomendasikan bahwa sistem yang beroperasi saat ini membutuhkan persebaran beban listrik dengan memindahkan tiga penyulang di GI Magetan dan GI Ngawi ke GI Mantingan. Tiga penyulang tersebut yaitu penyulang Walikukun dan Trinil yang mendapatkan sumber dari GI Ngawi dan penyulang Sine yang mendapat sumber dari GI Magetan. Area calon pembangunan GI Mantingan yaitu didaerah Widodaren, Mantingan, Karanganyar, Ngrambe dan Sine. Penelitian menunjukan bahwa GI baru dibangun dengan kapasitas 60 MVA dan besar nilai pembebanan trafo Gardu Induk Mantingan selama 8 tahun memiliki rata-rata sebesar 41,41% serta biaya pokok penyediaan listik (BPP) rata-rata sebesar Rp. 2.101.

Kata kunci — kapasitas trafo, konsumsi energi listrik, regresi linear.

Abstract — The growth of electricity load in Ngawi and Magetan areas has increased due to the government's plan to build several infrastructure and industrial areas. The electricity provider must be able to predict the system's ability to serve consumers. The planning for the construction of substations (GI) is carried out to ensure that all electricity loads served can be properly accommodated. This research uses historical data in predicting the amount of electricity demand in the Mantingan substation area from 2019 to 2026. The method used is a linear regression with one-stage planning, which is for 8 years (long term). The results recommend that the current operating system requires an electric load by moving three feeders in Magetan substation and Ngawi substation to Mantingan substation. The three feeders, namely the Walikukun and Trinil feeders, were sourced from the Ngawi substation and the Sine feeders which were sourced from the Magetan substation. The prospective areas for the construction of the Mantingan Substation are Widodaren, Mantingan, Karanganyar, Ngrambe, and Sine areas. Research shows that a newly built substation with a capacity of 60 MVA and the load value of the Mantingan substation transformer for 8 years has an average of 41.41% and an average of biaya pokok penyedia listrik (BPP) of Rp. 2,101.

Keywords— transformer capacity, electrical energy consumption, linear regression.
Using the Technology-Organization-Environment Framework Approach in the Acceptance of Telemedicine in the Health Care Industry
Authors: Sukardi . , Hasyim . , Supriyantoro .
Published: May 2021

Telemedicine is an innovation in providing health services to patients, perceptions of technology vary from one individual to another. The level of technology acceptance is something that needs to be researched because it will affect the use of a technology in the company, this is because the received technology will continue to be used in the company and the rejected technology will be a neglected part. There are the important considered criteria for the acceptance of a technology of this research: the adoption of innovation, organizational measurement, business environment, and communication channels.

The purpose of this study was to analyze the effect of technology acceptance, organizational size, business environment on the adoption of telemedicine with the influence of the communication channel. The research method is an explanatory research using a quantitative approach. The population in this study was 156 people. The used data analysis method in this research is a Moderated Regression Analysis (MRA). The results from the MRA analysis show that technology acceptance is positively and significantly influenced by communication channels on the adoption of telemedicine. In contrast, the measurement of the organization and the business environment did not have a significant effect on the adoption of telemedicine in the health service industry. The implication of hospital management to increase technology acceptance must pay attention to the advantages of using telemedicine, the suitability of existing technology in hospitals to develop telemedicine, the ease of used technology, the results that seen from the use of telemedicine and it can be tested before being applied. Communication needs to be improved by paying attention to the credibility of the communicator, the content and context of telemedicine, the clarity and continuity of information, the used language is easy to understand and the right communication channel is interpersonal.
The Problem of Russia Historical Age in the Concept of O. Spengler
Authors: Tyapin Igor N.
Published: May 2021

The methodological basis for the reconstruction of O. Spengler’s ideas about the historical age of Russia is the comparative analysis of his concept with the heritage of Russian conservative thought. German philosopher, in fact, carried out due to his Eurocentrism and somewhat biased attitude to Russia, a certain synthesis of the ideas N.Ja. Danilevsky and K.N. Leontiev, such as: the views on the youthfulness of Russian cultural and historical type, its Eastern Byzantine foundations, the negative nature of Western cultural influence, the lack of effectiveness of cultural and state life. In general, Spengler perceived contemporary Russia as a relatively young socio-historical organism, containing only the embryo of cultural originality, distorted by two historical pseudo-morphoses, but still capable of finding itself as a gradually expanding, hierarchically organized Asian country through the achievement of appropriate spiritual and geopolitical goals.
Oswald Spengler and the End of History
Authors: Yuriev Dmitry A.
Published: May 2021

After the decline of the West mankind is viable and necessary. The decline of the West is even now succeeded by the rise of the East, - whether it is the Rise of Russia predicted by Spengler, or the realization of the prosymbol of the nascent new world. The Rise that constitutes the only option of saving the West from wrathful oblivion, or perhaps, from self-destruction together with planet itself. The Rise that would mean preservation of incomparable achievements of the West and the whole mankind, that was successfully lead by the West in the 16th -20th centuries. But will this necessary option be realized?
Oswald Spengler’s “Pseudomorphosis” Concept and the Problem of Russian Religious Radicalism
Authors: Utkin Abbot Vitaly
Published: May 2021

On the basis of Oswald Spengler’s concept of “pseudomorphosis” the author of the article examines the problem of Russian religious radicalism as people’s response to the propagation in Russia of foreign Western civilization. He shows the unity of the ideological field of Russian religious radicalism that included both part of the Old Belief follows and the disciples of the inter-church movements of Khlysts and Skoptsy. The author reveals the similar character f the people’s spiritual reaction to the Westernizing reforms of Peter I and the reforms of the Bolsheviks.
Russophobic Stereotypes of Oswald Spengler
Authors: Bliznekov Vladimir L.
Published: May 2021

The article examines Oswald Spengler’s perception of Russia and Russians from the point of view of his concept of cultural morphology. As the result, the author concludes that there is a large amount of Russophobic stereotypes in the philosophical concepts of Spengler and raises the question of the reasons for their existence.
Unknown Article On Oswald Spengler’s Book
Authors: Fetisenko Olga
Published: May 2021

The article is devoted to the manuscript, discovered in one of Moscow archives, that that is dated the late 1920-ies and constitutes a review of O. Spengler’s “Der Untergang des Abendlandes”by an unknown author. On reviewing certain possibilities the author of the article comes to the conclusion that the authorship could be established only approximately (G. Postnikov or N. Luzin).