bluuebunny/crossref_metadata_2025 huggingface dataset:
Assessment of ductility properties of the connections in a prefabricated timber panel
Authors: Pasca Dag Pasquale , Myrvhold Caroline Anita , Høibø Olav Albert , Nyrud Anders Qvale , Tomasi Roberto
Published: July 2020

The results of experimental tests conducted on the joints of a wood-based prefabricated sandwich panel recently developed in Norway are presented. The connections investigated were those involved in constituting the lateral-force-resisting system for a wall assembly, namely the panel-to-sill connections. Several European standards are undergoing a revision process, one of which describes the procedures and methods of assessment of timber joints made with mechanical fasteners, tested under quasi-static cyclic conditions. The objective of this investigation was therefore to compare the current methodologies with those presented in a revision proposal and a third method used in Japan. The revision proposal introduces the concept of strength degradation, which should ensure a large amount of energy dissipation without significant loss of strength when designing structures for earthquake loads. The results of the testing regime are presented and the advantages and disadvantages of the three methods are discussed.
Effects of corrosion on shear behaviour of discontinuous perfobond rib shear connectors
Authors: Liu Duo , Mao Zeliang , Deng Wenqin , Gu Jiancheng , Ji Bohai , Zhang Jiandong
Published: July 2020

To study the effect of steel corrosion on the shear resistance of new shear connectors, push-out tests were carried out on three groups of six discontinuous perfobond rib shear connectors with different corrosion ratios. After testing, the displacement, strain distribution, crack development and relative slip between concrete and steel were assessed. Based on the experimental work, the effects of corrosion of perfobond ribs and transverse rebars on the shear resistance of the connectors were studied using finite-element models. The results showed that when the corrosion ratio was low, the corrosion of the perfobond rib increased the cohesion between the steel and the concrete, thereby improving the initial stiffness and ultimate bearing capacity (UBC) of the structure. With an increase in the corrosion ratio, expansion cracks on the joint surface led to bonding failure between the steel and concrete and the shear resistance of the structure was greatly reduced. When the corrosion ratio of the transverse rebars was 10%, the UBC of the connection decreased by only 5% and the initial stiffness hardly changed.
Performing CUT&RUN on adherent cells in a multi-well cell culture plate v1
Authors: Miura Michi
Published: July 2020

This protocol describes a variant of the standard CUT&RUN procedure (Skene et al. eLife 2017; Skene et al. Nature Protocols 2018; Meers et al. eLife 2019). This streamlined protocol is immediately applicable to adherent cells maintained in a multi-well cell culture plate. Trypsinising cultured cells to harvest and attaching them onto Concanavalin A-beads are not required.
Cold Spring Harbor - Intraductal Injection v1
Authors: Tuveson David
Published: July 2020

from Xiao et al., Nat Prot 2014, modified by KM.
Prescription of statins and contraindicated and risky drug interactions in Colombian patients v1
Authors: Machado Alba Jorge , Valladales Luis , Medina Diego , Giraldo Claudia
Published: July 2020

Abstract Purpose: Statins have extensive hepatic metabolism and can have multiple pharmacological interactions. The aim was to identify the main pharmacological interactions between statins and their comedications in a group of patients from Colombia. Materials and methods: A cross-sectional study of drug interactions in patients treated with statins who were identified from a population database. The interactions were documented using the Lexicomp® database. A descriptive analysis was performed using frequencies and proportions for the qualitative variables and measures of central tendency and dispersion for the quantitative variables. Binary logistic regression models were applied. A level of statistical significance of p < 0.05 was determined. Results: A total of 123026 patients with statin prescriptions were identified, with a mean age of 68.4 ± 11.5 years; 57.1% were women, and 81.6% received atorvastatin. A total of 19.4% of the patients presented pharmacological interactions; 64.9% were category C, 38.1% were category D, and 2.8% were category X. A total of 36.8% of the patients with lovastatin prescriptions had some interaction. Gemfibrozil was drug associated with the most category X interactions among the different statins. Age older than 65 years, male sex, residence in capital cities, comorbidities, endocrine pathologies and HIV were associated with an increase in the probability of having contraindicated or risky interactions. Conclusions: Important interactions between statins and other medications were more common in adults over 65 years of age and those with endocrine comorbidities or HIV infection. This knowledge should help when proposing solutions that reduce the risk of adverse reactions.
Axioms as the Main Points of the Study of Mass Emotions in Social Communications
Authors: Beletska Alevtyna
Published: July 2020

The article continues the scientific study of the mass emotions nature in social communications caused by the means of mass communications (mass media, social networks). The article is based on 27 axioms (the statements that are the starting points for building a system of evidence): each subsequent axiom develops the previous one, as it obviously follows from it. The axioms are divided into 5 groups according to the logic of transition – from the axioms on individual emotions, to the axioms on emotions in mass communications and mass emotions in social communications. It is significant to note that the last axiom of the proposed list states that mass emotions as a phenomenon of social communication should be studied in the theory of social communication.

The article elaborates the part of the topic “Mass emotions as a sphere of functioning of social communications”, which is currently relevant for all participants of social communication process. The proposed series of axioms could be a cornerstone of the theory of mass emotions in social communications.
New Tendencies of the Viewer Involvement in Producing ZIK TV Channel Analytical Product
Authors: Yelisovenko Yurii , Nytchenko Anna
Published: July 2020

The latest trends of viewers` participation in producing an analytical product on the example of ZIK TV channel are considered. The objective of the study is to identify and to describe the latest trends in producing the broadcaster`s analytical programs; to identify which techniques of interaction with the audience are used by ZIK TV channel, to determine their strengths and weaknesses, and to suggest the ways of more effective interactions. The article identifies the viewer’s place in producing the television analytical product with the latest trends in increasing audience interaction. Such research methods as documentation analysis, observation, compara-tive, thematic and content analysis, synthesis and traduction have been applied.

It is determined whether the viewer influences on producing the program at its various stages and in which exactly: from the idea to its broadcast, as well as selection of issues, topics, chro-nology, timekeeping, selection of presenter and experts. The study helps to find out how the viewer influences on producing the analytical television programs, to identify the trends in de-velopment of interactivity in television analytics, and to create a basis for the new researches. Based on the program «Vox Populi» on ZIK, as well as the results of the study and its conclu-sions, we have formulated the recommendations for the audience participation in producing the analytical program as well as transformation of editorial functions determined by increasing the level of viewer’s interactivity.
Emotional Attitude to School and Self-Attitude in High School Students of Different Sex and Age
Authors: Vartanova I.I.
Published: July 2020

The aim of this work was to study (taking into account gender and age) the relationship between emotional attitude to learning activity and self-attitude in high school students. The following parameters were revealed separately for groups of boys and girls: 1) the structure of the emotional attitude to the values of school life (by factor analysis of assessments obtained with the Semantic Differential scale); 2) the indicators of self-attitude (according to the technique by S.R. Pantileev); 3) the correlations between the selected factors and the parameters of self-attitude. The study involved students of 9—11 grades (14—17 years old) from two Moscow schools. A total of 346 people were surveyed; the subjects were divided into 4 groups: younger groups (8—9 grades, 14—15 years old) boys (73) and girls 76), older groups (grades 10—11, 16—17 years old) of boys (98) and girls (99); both techniques were used in 217 students: younger groups of boys (41) and girls (49), older groups boys (63) and girls (66).As it was found, with age there is a tendency to change the semantic content of some motives — for boys in the field of status motivation, and for girls in the field of learning motivation. In girls, various types of emotional and motivational attitudes toward learning are more consistent with the parameters of self-attitude. At the same time, among younger boys motivation of duty and recognition is closely related to self-attitude, whereas in older boys the latter is related only to learning and cognitive motivation.
Self-Perception of Giftedness in Adolescents Selected for Gifted Education Programmes
Authors: Volkova E.N. , Miklyaeva A.V. , Kosheleva A.N. , Khoroshikh V.V.
Published: July 2020

Specialized support for gifted children and adolescents should be based on the specifics of their social situation of development which is largely determined by the fact of identifying a person as gifted. ‘Labeling giftedness’ has a significant impact on the system of interpersonal relationships and self-attitude of children and adolescents. However, there is no holistic construct of the phenomenon of ‘self-perception of giftedness’ in psychology today, therefore, we defined the theoretical and empirical development of this construct as the goal of our study. The paper presents the results of this study which describes the construct of ‘self-perception of giftedness’ basing on the survey of 422 adolescents aged 15—17 years who had been selected for gifted education programmes. Using factor analysis we identify the main dimensions of the construct typical for late adolescence: giftedness resources/risks assessment; environment of risks and resources manifestation (internal/external); localization of conditions for high achievement (internal — external).Basing on the analysis of the significance of differences, we outline the perspectives of using the construct to reveal gender specifics of self-perception of giftedness in older adolescents enrolled in gifted education programmes.
The “Authentic Self” as a Predictor of Emerging Adulthood in Students
Authors: Klementyeva M.V.
Published: July 2020

This article explores the role of “authentic Self” in the developmental processes of students aged 18—33 years. The study involved 320 undergraduate and graduate students of Russian universities. The following aspects were measured: the reflexive assessment of the “authentic Self” and “adult Self” (using the author’s technique), the existential life fulfillment (“Existential Motivation Test”, EMT), the socio-psychological adaptation and maturity (“Social and Psychological Adaptation Questionnaire”, SPA).The outcomes of the study demonstrate that the emotional experience of emerging adulthood is associated with one becoming aware of a combination of characteristics of adulthood (the adoption of responsibility and independence, the achievement of stable employment and stable interpersonal relationships) and the authentic being of personality (relativity and personal involvement in the process of life).We also found that the degree of the students’ reflection of the “authentic Self” acts as a predictor of optimistic assessment of the existential life fulfillment and achievement of socio-psychological maturity.
Psychological Analysis of the Problem of Marginalism, Procrastination and Learned Helplessness as Barriers to Personal and Professional Development
Authors: Mitina L.M. , Mitin G.V.
Published: July 2020

Solving the problem of personal and professional development of modern man requires the formulation of a number of interconnected theoretical, experimental and practical problems. One of the main ones is the need to study psychological barriers — those negative phenomena that affect individual and social consciousness. The article presents a psychological analysis of marginalism and procrastination as barriers to personal and professional development of a person. The main sign of the marginality of professional consciousness and self-consciousness is the inversion of values and meanings, the desire to have benefits not by realizing one’s uniqueness as an individual and professional, but by receiving them undeservedly in the shortest way. The person’s tendency to constantly postpone the planned actions and important matters — procrastination — causes a distortion of self-determination in personal and professional self-determination. The main psychological factor in the manifestation of marginalism and procrastination of a specialist is the emergence in childhood and the consolidation in the educational process of schools and universities of various forms of personal (learned) helplessness. An important resource for the prevention and correction of learned helplessness, marginalism and procrastination is a favorable educational environment in the family, school, university, and other social institutions.
A Link between Machine Learning and Optimization in Ground-Motion Model Development: Weighted Mixed-Effects Regression with Data-Driven Probabilistic Earthquake Classification
Authors: von Specht Sebastian , Cotton Fabrice
Published: July 2020

The steady increase of ground-motion data not only allows new possibilities but also comes with new challenges in the development of ground-motion models (GMMs). Data classification techniques (e.g., cluster analysis) do not only produce deterministic classifications but also probabilistic classifications (e.g., probabilities for each datum to belong to a given class or cluster). One challenge is the integration of such continuous classification in regressions for GMM development such as the widely used mixed-effects model. We address this issue by introducing an extension of the mixed-effects model to incorporate data weighting. The parameter estimation of the mixed-effects model, that is, fixed-effects coefficients of the GMMs and the random-effects variances, are based on the weighted likelihood function, which also provides analytic uncertainty estimates. The data weighting permits for earthquake classification beyond the classical, expert-driven, binary classification based, for example, on event depth, distance to trench, style of faulting, and fault dip angle. We apply Angular Classification with Expectation–maximization, an algorithm to identify clusters of nodal planes from focal mechanisms to differentiate between, for example, interface- and intraslab-type events. Classification is continuous, that is, no event belongs completely to one class, which is taken into account in the ground-motion modeling. The theoretical framework described in this article allows for a fully automatic calibration of ground-motion models using large databases with automated classification and processing of earthquake and ground-motion data. As an example, we developed a GMM on the basis of the GMM by Montalva et al. (2017) with data from the strong-motion flat file of Bastías and Montalva (2016) with ∼2400 records from 319 events in the Chilean subduction zone. Our GMM with the data-driven classification is comparable to the expert-classification-based model. Furthermore, the model shows temporal variations of the between-event residuals before and after large earthquakes in the region.
Nonlinear Multiple Earthquake Location and Velocity Estimation in the Canadian Rocky Mountain Trench
Authors: Purba Joshua Chris Shadday , Dettmer Jan , Gilbert Hersh
Published: July 2020

The calculation of earthquake hypocenters requires careful treatment, particularly when prior knowledge of the study area is limited. The prior knowledge, such as wave velocity and data noise, is often assumed to be known in earthquake location algorithms. Such assumptions can greatly simplify the inverse problem but are less general than nonlinear approaches. A nonlinear treatment is of particular importance when the uncertainty quantification of locations is of interest. We present a nonlinear multiple-earthquake location method that is applicable when little prior knowledge of the area exists. Efficient Markov chain Monte Carlo (MCMC) sampling is employed in conjunction with a hierarchical Bayesian model that treats earthquake hypocenter parameters, as well as P-wave velocity, ratio in P-/S-wave velocities, and P- and S-data noise standard deviations as unknown. Hypocenters for multiple earthquakes are located concurrently to provide sufficient constraints for the parameter’s P-wave velocity, ratio in P-/S-wave velocity, and P- and S-data noise standard deviations, which are shared among events. The algorithm is applied to simulated and field data. With field data, 47 event hypocenters are located in 1 yr of data from 10 sensors in the Canadian Rocky Mountain trench. To analyze the probabilistic solutions, we compare single-earthquake and multiple-earthquake locations for the 47 events and find that the multiple-earthquake location produces better-constrained solutions when compared with the single-event case. In particular, depth uncertainties are significantly reduced for the multiple-earthquake location. The algorithm is inexpensive, considering that it is based on an MCMC approach and highly objective, requiring little practitioner choice for tuning.
Pemanfaatan Daun Biduri (Calotropis Gigantea) Sebagai Perekat Pada Pembuatan Briket Serbuk Gergaji Kayu Bayur (Pterospermum Javanicum)
Authors: Eko Rahmanto Dedy , Fitroni Esma Hadi , Rudiyanto Bayu
Published: July 2020

Abstrak. Kayu bayur banyak digunakan untuk pembuatan bahan baku furnitur yang menghasilkan limbah serbuk gergaji. Kayu bayur memiliki nilai kalor sebesar 4.452,01 kal/gr, kadar abu 1,04% dan kadar air 19,29%. Serbuk gergaji kayu bayur ini sangat berpotensi digunakan sebagai bahan pembuatan briket dengan penambahan perekat.  Bahan yang bisa digunakan sebagai pengganti perekat tepung tapioka adalah daun tanaman biduri. Tanaman biduri memiliki kandungan kimia seperti selulosa, pentosan sebagai hemiselulosa, lignin, abu, tanin 9,1mg/g dan pektin 55%. Pembuatan briket dengan perekat daun biduri bertujuan untuk mengetahui bagaimana pengaruh berbagai variasi perekat, dan bagaimana karakteristik briket yang dihasilkan. Penelitian yang telah dilakukan mendapatkan hasil bahwa dari variasi kadar perekat 35%, 40%, dan 45% pada briket terbaik yaitu pada variasi ke BB3 diaman 55% (30 g) arang serbuk gergaji kayu bayur dengan 45% (24,5 g) perekat daun biduri dan karakteristiknya mencapai nilai SNI briket No.1/6235/2000. Pada perlakuan ini nilai yang diperoleh yaitu untuk kadar air 1,8%, kadar abu 7,42%, densitas 0,4235 g/cm3, nilai kalor 5.069,589 kal/g, dan uji tekan 4,0538 kg/cm2.The Use of Leaves Biduri (Calotropis Gigantea) as Adhesives to Making Briquettes Sawdust Wood Bayur (Pterospermum Javanicum)Abstract. Bayur wood is widely used for manufacturing furniture raw materials that produce sawdust waste. Bayur wood has a calorific value of 4,452.01 cal/g, ash content of 1.04% and a moisture content of 19.29%. This bayur wood sawdust is very potential to be used as a briquette making material by adding adhesive to the briquetting process. Material that can be used as a substitute for tapioca flour adhesive is the leaves of the biduri plant. Betell plants have chemical properties like cellulose, pentatosan as hemicellulose, lignin, as, tannin 9.1 mg/g and pectin 55%. The making of briquettes with biduri leaf adhesive aims to find out how the influence of various variation of the adhesive, and how the characteristics of the briquettes produced. The research that has been carried out shows that the variation of 35%, 40%, and 45% adhesive content in the best briquettes is in the variation to BB3 where 55% (30 g) chacrcoal of sawdust with 45% (24.5 g) of adhesive biduri leaves and their characteristics reach to SNI briquettes No.1/6235/2000. In this treatment the values obtained are for water content of 1.8%, ash content of 7.42%, density 0.4235 g/cm3, calorific value of 5,069.589 cal/g, and pressure test of 4.0538 kg/cm2.
Efecto del tipo de activador en un mortero de escoria mezclado con caliza activada alcalinamente
Authors: Torres Rubio Nelson Virgilio , Sarmiento-Rojas Jorge Andrés , Gutierrez Junco Oscar Javier
Published: July 2020

Introducción: Las escorias activadas alcalinamente han sido una base fundamental en el desarrollo de nuevos cementos con propiedades mecánicas y fisicoquímicas las cuales en algunos casos han sido mejores que las del cemento tradicional, este tipo de productos industriales conlleva al estudio de materiales de construcción alternativos.
Objetivo: Estudiar el efecto de diferentes tipos de activadores alcalinos, adición de caliza y cambios de temperatura sobre las propiedades físico-mecánicas de los morteros a base de escoria activados alcalinamente.
Metodología: Se realiza un análisis fisicoquímico de las características de las materias primas mediante pruebas de MEB, FRX, DRX. Se desarrollaron pruebas preliminares para determinar la dosificación óptima de los activadores utilizados, para luego elaborar los morteros objeto del estudio y evaluar su propiedad mecánica. El estudio se desarrolla para tres soluciones alcalinas Na2SiO3/NaOH (SH), Na2SiO3/Na2CO3 (SC) y Na2SiO3 (SS), así como para dos temperaturas de curado a temperatura ambiente (23ºC) y 60ºC.
Resultados: Como resultado se obtuvo el activador con mejor comportamiento, el cual fue el Na2SiO3/NaOH (SH) alcanzando una resistencia de 35,3 MPa.
Conclusiones: De acuerdo con los resultados, los morteros que presentaron mejor comportamiento fueron aquellos sometidos a temperaturas de 60°C y a mayor tiempo de curado aumentando sus propiedades de resistencia.
Ingeniería de Software: el aseguramiento de la calidad de los requisitos en la industria del software en el eje cafetero colombiano
Authors: Peláez Valencia Luis Eduardo , Toro Lazo Alonso , Arias Vargas Juan Luis , Rodríguez Franco Daniel Eduardo
Published: July 2020

Introducción: La ingeniería de software, como disciplina, se representa en una serie de subdisciplinas y de buenas prácticas, Una de ellas, el aseguramiento de la calidad del software y, dentro de esta, la calidad de los requisitos. Esta investigación explora y describe la situación en el Eje Cafetero (Colombia), la contrasta con la literatura internacional y propone líneas de acción para mejorar el proceso de desarrollo del software desde el aseguramiento de la calidad de los requisitos.
Objetivo: Caracterizar las prácticas de la Industria del software local y su relación con el aseguramiento de la calidad, particularmente en la fase de requisitos.
Metodología: La metodología usada en la investigación fue principalmente de tipo descriptiva y exploratorio, en la cual se usó un muestreo no probabilístico por conveniencia en la que participaron 23 empresas y se recolecto la información a través de encuesta.
Resultados: Datos de entrada para la formulación de un modelo para el aseguramiento de la calidad de los requisitos en la industria local del software.
Conclusiones: La mayoría de los proyectos que se emprenden en la industria local están en manos de organizaciones unipersonales o MiPYMES; organizaciones estas que en su mayoría evitan seguir estándares o metodologías aceptadas y reconocidas mundialmente, llevando entonces la definición de requisitos, para el caso que ocupa este artículo, a una mínima expresión y aumentando así las estadísticas de proyectos fracasados.
Desarrollo de nueva metodología de diseño, análisis y aplicaciones de micro y nanoinstrumentación inteligente soportadas en Ingeniería en Nanobiotecnología para la Automatización Industrial.
Authors: Muñoz Moner Antonio Faustino , Pardo García Aldo , Caicedo Torres Pedro Miguel
Published: July 2020

Introducción− El presente artículo muestra los resultados de la investigación realizada en el proyecto sobre diseño y desarrollo de nuevas metodologías para el diseño, análisis y aplicación de micro y nanoinstrumentación inteligente soportada en Ingeniería en Nanobiotecnología por tecnología de monitoreo en tiempo real del contenido de fenoles en las aguas residuales industriales, flujos de vertimiento en línea de ductos, tanques de tratamiento, piscinas de estabilización a cielo abierto y en la descarga del vertimiento del agua como parte del desafío presentado por Ecopetrol sobre la necesidad de descontaminación de las aguas residuales en la Refinería de Petróleo de Barrancabermeja.
Objetivo− Lo propuesto anteriormente se traduce en una red de sensores que garantiza la redundancia necesaria para la confiabilidad técnica, que incluye un Sistema Instrumentado de Seguridad (SIS) dotado de un Sistema de Control Redundante (RCS), lo que asegura el funcionamiento óptimo de la instrumentación implementada y además permite reducir el tiempo de medición en cada secuencia de muestreo.
Metodología− A través de la detección de contaminantes en tiempo real se utiliza una red de sensores basados en micro y_nanobioinstrumetación con nariz electrónica, lengua artificial y ojo espectrofotométrico, soportada en tecnología móvil para el monitoreo de los parámetros de calidad del agua (contenido de fenoles) en líneas de tubería en vertimiento y afluentes.
Resultados− En el articulo se exponen los resultados desarrollados de un sistema de monitoreo en tiempo real y control on-line por tecnología móvil de parámetros de calidad del agua (fenoles) en línea de tuberías para vertimientos y afluentes emulados por la replicación funcional del funcionamiento de los sentidos del olfato, sabor y de la visión espectrofotométrica por clonación artificial aplicados en el diseño de una red de sensores y sistemas de control.
Conclusiones− En síntesis, el proyecto presenta una solución alternativa viable soportada en indicadores de alto impacto, técnico-tecnológico, económico y confiable, donde la información se presenta en tiempo real con un registro cada dos minutos, y acceso omnipresente (desde cualquier lugar) por tecnología móvil, con una disminución de los costos de fabricación e implementación en más de cien veces por utilización de MEMS y NEMS.
Spatio-temporal variability monitoring of the floods in the center-west of the Buenos Aires Province (Argentina) using remote sensing techniques
Authors: Contreras F.I. , Mavo Manstretta G.M. , Piccolo M.C. , Perillo G.M.E.
Published: July 2020

Floods are recurring events in Buenos Aires Province, mainly caused by high-intensity precipitation, and in some cases, they persist for long periods. The objective of this study is to analyze how the topography of the central-western portion of Buenos Aires Province determines the occurrence and the extent of floods. The presence of shallow lakes characterizes the area which is controlled by the topography. LANDSAT 5 and 8 images corresponding to periods of drought and flooding in the area were compared with topographic profiles and digital elevation models generated from SRTM 3 arc/sec data. The results showed that in those areas where there are aligned dunes, and after significant storm drain engineering works, during the wet periods, the lakes, their overflows, and the subsequent runoff to the east of Buenos Aires Province flow freely, limiting the flood areas. Due to this topography, the lakes became a more permanent feature of the landscape, even during extreme drought events. In contrast, in those areas where parabolic dunes predominate, the landscape is more affected by droughts and floods. During drought events, we observed a small number of shallow lakes, and during strong storms with high-intensity rainfall, the number of lakes increases and large flooded areas generate damage to agricultural fields and neighboring cities, either due to natural causes or improvised and illegal storm drains. Early warning of flood risks and a systematic territorial ordaining would be the key to the management of the area.
Habit tic nail dystrophy: a case report affecting single thumb nail
Authors: Oommen Boby John , Kadori Waad Ibrahim Majed
Published: July 2020

Habit-tic deformity is a classic example of overlap between the domains of dermatology and psychiatry.  Mostly seen in adults, it results from the habit of picking or pushing the cuticle backward. A case of habit-tic deformity of a single thumb nail is reported and the simple treatment measure adopted discussed.
Review for the management of vitamin B12 deficiency in diabetic patients on metformin
Authors: Sedeeq Saad Thamer , Mohamed Zohor Ahmed Kamaleldin , Al Fehaidi Al Anoud Saleh , Al Tamimi Mohammad Jamil Mohammad , Elhamid Mohamed Abd , Muktar Amina Ali Mohamed , Hamed Ehab
Published: July 2020

Long-term usage of Metformin is associated with lower serum vitamin B12 levels. The lower than normal levels could worsen neurological complications of diabetes, including diabetic neuropathy and poor cognition. Guidelines advise periodic monitoring of vitamin B12 but do not specify frequency, treatment targets or treatment modality. This commentary aims to review the prevalence and the severity of the presentation and to provide evidence-based answers to those clinical questions not answered by current guidelines.
A study of renal dysfunction among HIV-infected patients on tenofovir based ART regimen in the Northeast part of India
Authors: Gayatri Lourembam , Manpang Nang N. , Nobing Duyu , Chongtham Dhanaraj S. , Singh M. Bijoy , Mazumdar Sudhangshu
Published: July 2020

Background: Tenofovir is an integral part of the currently used antiretroviral therapy (ART) regime. However, nephrotoxicity has been a concern. This study has been undertaken to evaluate the prevalence and risk factors of renal dysfunction among HIV-patients on tenofovir containing ART regime.Methods: This cohort study was conducted at Regional Institute of Medical Sciences. HIV-patients newly started on tenofovir containing ART regime were subjected to detailed history, thorough physical examination, and routine investigations. Serum creatinine levels and creatinine clearance were measured at regular intervals.Results: Mean age of the patients was 42.37±10.8 years. Most of the patients had normal BMI (66%) and 22% were obese while 12% of the cases were underweight. Majority of the patients had CD4 count less than 350 cells/cumm. Renal dysfunction, defined as creatinine clearance <50 ml/min, developed in 9% of the patients at 3 months and in 33% of the patients at 6 months. Old age, low CD4 cell count, HCV co-infection, and advanced HIV infection were found to be important risk factors.Conclusions: Development of renal dysfunction is common among HIV patients receiving tenofovir-based ART regimen. Old age, low CD4 cell count, HCV co-infection, and advanced HIV infection were found to be important risk factors.
An application of multiple logistic regression for identifying lipid profile changes towards assessing maternal and fetal outcomes
Authors: Rosaiah K. , Kolli Naga Saritha , Sanjeeva Rao N. S.
Published: July 2020

Background: The millennium development goals encourage governments to address and reduce various developmental issues, two of the important ones being maternal and child health. The one of the important causes of maternal mortality in India is pregnancy induced hypertension (PIH) and present study is to identify the relationship between disturbed lipid profile and preeclampsia its effect on fetal and maternal outcome.Methods: This was a descriptive cross-sectional study done on data of maternal care and outcomes from the NRI General Hospital, Guntur district in the year 2013. Multiple logistic regression analysis is applied and results are adjusted to covariates maternal age and gravida.Results: Systolic blood pressure, diastolic blood pressure of normal group (n=50) and PIH group (n=60) are 116.08±7.77, 76.08±4.93, and 165.66±16.8 105.5±14.07 respectively. Birth weights of infants in normotensives and PIH group are 2.85±0.33 and 1.93±0.659 respectively. Percentages of fetal and maternal complications in PIH group are 88.33% and 25%. Still births are present in 31.66% of PIH cases. Mean and SD of gestational age in weeks in normal and PIH groups are 37.92±1.94 and 34.36±3.44 respectively.Conclusions: The model showed significant association between the selected independent variable, covariates and outcomes. The study demonstrates that multiple logistic regression may be applied to medical data in developing predictor models which are useful in clinical settings.
A study on otorhinolaryngology related emergency surgical procedures performed under general anaesthesia in a teaching hospital
Authors: Koirala Krishna P. , Karki Bikram B. , Maharjan Manita
Published: July 2020

Background: Most of the ear, nose and throat related disorders that present in emergency can be managed without anaesthesia. Some of them are potentially life threatening and critical requiring surgical interventions under general anaesthesia, too. Ear, nose, and throat related emergency conditions are in rise due to increased incidence of road traffic accidents, social violence and physical assault. This study was performed to find out common ear, nose, throat and head and neck related emergency conditions that required emergency surgical procedures under general anaesthesia for their treatment.

Methods: One hundred and seventy-seven patients were enrolled in this prospective cross-sectional study. Patients who underwent emergency operative procedures under general anaesthesia were assessed to find out the common reasons of admission and the common procedures performed for their treatment.  

Results: Out of 177 patients enrolled in the study, 26.6% were children below the age of 10 years. About three fourths (74.6%) had presented with foreign body in the ear, nose, or throat, and about 77% of them requiring anaesthesia were foreign bodies of the esophagus. Next most common surgical procedures were performed for different traumatic injuries (23.7%). Rest 1.7% of patients required other procedures like tracheostomy, sphenopalatine artery cauterization and traumatic split lobule repair under general anaesthesia.

Conclusions: Foreign bodies in the ear, nose and throat are the most common emergency conditions requiring emergency surgery under general anaesthesia followed by traumatic cut injuries in our institution. Prompt treatment of the emergency condition is required for the better patient outcome.
Stapedotomy post-operative results and complications
Authors: S. Giri Hanumant , C. Bishnoi Ram , Nayak Pooja D. , Gaikwad Ninad S.
Published: July 2020

Background: Otosclerosis is a hereditary localized disease of the bone derived from the otic capsule. It is characterized by alternating phases of bone formation and resorption and patient presents with conductive hearing loss. Treatment of otosclerosis can be of two kinds: hearing aids and surgery. Stapedectomy and stapedotomy are the two surgical procedures done for treatment of otosclerosis. Present study was conducted on 30 patients with otosclerosis who underwent stapedotomy to assess the hearing results post-surgery by serial Audiometric studies and to study the complications of stapedotomy surgery.

Methods: This prospective observational study conducted on 30 patients of otosclerosis who fulfilled the inclusion and exclusion criteria.  

Results: In this study of thirty cases of otosclerosis which were operated for small fenestra stapedotomy, we conclude that Hearing gain post-surgery was remarkable especially for patients with a pure conductive hearing loss. There was no deterioration in hearing after two years of follow-up. In our study on 30 patients we encountered minor complication in 4 patients (13.33%) and 1 major complication of profound sensorineural hearing loss 3.33%.

Conclusions: We conclude that stapedotomy is a relatively safe procedure with significant post-surgery hearing benefit.
Estresse em docentes do ensino fundamental no município de Boa Ventura - PB
Authors: Correia Deyse Morgana das Neves , Diniz Manuela Laurentino , Leite Marcos Islânio Carvalho
Published: July 2020

O presente texto apresenta reflexões resultantes de pesquisa fomentada pelo PIBICT/IFPB sobre o estresse na rotina diária do professor. Por ser um fator prejudicial à sua saúde, pode acarretar problemas de ordem física, psíquica e/ou social. Levando em consideração tais questões, o estudo sobre o estresse se faz necessário, uma vez que estes problemas interferem na prática de ensino e, consequentemente, na qualidade da educação. Portanto, o objetivo deste artigo é analisar as causas e consequências do estresse em docentes de uma escola pública de Ensino Fundamental localizada no município de Boa Ventura - PB. Para o desenvolvimento deste trabalho foram realizados estudos teóricos para subsidiar as análises dos dados produzidos na pesquisa de campo, que aplicou questionários e realizou entrevistas semiestruturadas com dez professores da instituição. Como resultado da análise dos dados, verificou-se dentre outras questões, que as condições de trabalho mais estressantes são: ritmo de trabalho intenso e acúmulo de trabalho em horário extra (100%) e trabalho monótono e repetitivo (70%). Dentre os principais sinais e sintomas sentidos pelos professores constatou-se: nervosismo (90%), dificuldade de tomar decisões (60%), dores de cabeça frequentes, sensibilidade e insônia (50%) e até ideia de suicídio (10%). Diante dos fatos apresentados, conclui-se que as condições inadequadas de trabalho contribuem diretamente para o desencadeamento de sintomas de estresse e por isso, merecem atenção e intervenção.
ESTATÍSTICAS DE INCÊNDIOS ESTRUTURAIS NO BRASIL: DO ‘ANUÁRIO’ AOS DIAS ATUAIS
Authors: Corrêa Cristiano , Duarte Dayse , Braga George Cajaty
Published: July 2020

O presente artigo discute as estatísticas de incêndios em edificações no Brasil nas últimas décadas, passando pelo ‘anuário’ emitido pelo Instituto Brasileiro de Geografia e Estatística – IBGE, até o primeiro ano da década de 1990, quando por restrições orçamentárias e imprecisões dos números deixou de ser emitidas informações sobre incêndios. Passando pelos debates sobre a implantação de um ‘Sistema Nacional de Informações de Bombeiros’ não efetivado até dias atuais. Chegando a criação de Norma Técnica Brasileira – NBR para aferições de atividades de bombeiros, transcrita em recomendações do Conselho Nacional dos Corpos de Bombeiros do Brasil - LIGABOM. Todavia a possibilidade de cada Corpo de Bombeiros Militar Estadual aferir os eventos atendidos, sem uma padronização exigida em lei, mesmo existindo norma e recomendação específicas aliada a inexistência de uma política nacional consistente sobre o tema, promove um hiato de décadas de informações consolidadas nacionalmente, como consequência não sabemos o quanto grave é o problema dos incêndios e explosões no Brasil.

 
Analysis on the Feasibility of China's "Vendor Economy" under the New Economic Condition
Authors: Sun Qing
Published: July 2020

Vendor economy, also called street economy, which is often considered as the main income sources for street vendors and was regarded as marginal economy, has grown into a type of economic form. From the perspective of total social wealth, it jump-starts the economy, stimulates people's consumption desire and provides more employment opportunities, which drives a sharp increase in social total consumption, according to a research report analyzed from 2007 to 2017 by the Northeast Securities. During the ten years, China's economic policy is to encourage and support street vendors, and because of this, consumption plates are shown in a more obvious rise in profits, but it also has brought about some negative effects. On the basis of the characteristics and roles of the vendor economy, this paper analyzes its feasibility under the new economic condition through the comparison of its advantages and disadvantages. In addition, some suggestions are put forward to Chinese government and the street vendors.
Using Qi Culture to Promote Regional Economic Development
Authors: Cai Xiaoying
Published: July 2020

Qi culture is the main source of Chinese national culture, with profound cultural connotation and rich cultural atmosphere. With the continuous deepening of economic development, the development of regional cultural values has also become the main content of regional economic and social construction. This article discusses the causes of regional culture and summarizes the strategies for using Qi culture to promote regional economic development.
ВЫЧИСЛЕНИЕ ПОСЛЕДОВАТЕЛЬНОСТИ ГЛАВНЫХ МИНОРОВ ТЕПЛИЦЕВОЙ ЛЕНТОЧНОЙ МАТРИЦЫ
Authors: Апанович М. С. , Ляпин А. П. , Шадрин К. В.
Published: July 2020

В работе рассматривается алгоритм, который позволяет вычислить последовательность главных миноров тип лицевой ленточной матрицы, ассоциированный с задачей Коши для двумерного полиномиального разностного оператора с постоянными коэффициентами, с верхней (нижней) шириной ленты равной единице, что позволит определить невырожденность такой матрицы и, следовательно, сделать вывод о разрешимости задачи Коши.
КРАЕВЫЕ ЗАДАЧИ ДЛЯ ОБОБЩЕННОГО МОДИФИЦИРОВАННОГО УРАВНЕНИЯ ВЛАГОПЕРЕНОСА И РАЗНОСТНЫЕ МЕТОДЫ ИХ ЧИСЛЕННОЙ РЕАЛИЗАЦИИ
Authors: Бештоков М. X.
Published: July 2020

Рассмотрены начально-краевые задачи с условиями первого и третьего рода для обобщенного модифицированного уравпепия влагоперепоса с дробной по времепи производной. На равномерной сетке построены разностные схемы, аппроксимирующие эти задачи. Для решения этих задач в предположение существования регулярного решепия получены априорные оценки в дифференциальной и разностной формах. Из этих оценок следуют единственность и непрерывная зависимость решепия от входных данных задачи, а также сходимость со скоростью O(h2 + т2).
О ВЛИЯНИИ АСИММЕТРИИ ОТРАЖЕНИЯ НА КОГЕРЕНТНОЕ ИЗЛУЧЕНИЕ РЕЛЯТИВИСТСКИХ ЭЛЕКТРОНОВ В КРИСТАЛЛАХ
Authors: Внуков И. Е. , Волков И. С. , Гопонов Ю. А. , Сиднин М. А. , Шатохин Р. А.
Published: July 2020

Модифицирована предложенная ранее методика расчета выхода дифрагированных реальных фотонов в совершенных кристаллах с использованием подхода Дарвипа и Припса о многократных переот- ражепиях фотонов па отражающих плоскостях кристалла с помощью метода Монте-Карло. Обсуждается влияпие асимметрии отражающей плоскости относительно выходной поверхности па выход дифрагированного излучепия. Анализируются результаты измерений угловых распределений излучения параметрического рентгеновского излучепия (ПРИ) релятивистских электронов в кристаллах, в которых отражающая плоскость была не перпендикулярна выходной поверхности. Показано, что форма угловых распределений излучепия быстрых электронов в топких кристаллах может быть с достаточной точностью описана в рамках кинематической теории ПРИ с учетом вклада дифракции реальных фотонов как для симметричной, так и для асимметричной геометрии рассеяния. Информации для вывода о соотношении абсолютных значений измереппых выходов излучепия с расчетными не достаточно. Необходимы измерения выходов излучепия или угловых распределений для двух идентичных отражающих плоскостей с разным значением асимметрии в одинаковых экспериментальных условиях.
УРАВНЕНИЯ КИРКВУДА - ЗАЛЬЦБУРГА ДЛЯ РЕШЕТЧАТЫХ КЛАССИЧЕСКИХ МОДЕЛЕЙ СТАТИСТИЧЕСКОЙ МЕХАНИКИ
Authors: Вирченко Ю.П. , Московченко Е. Ю.
Published: July 2020

Изучается класс решетчатых моделей статистической механики классических систем с суммируемым парным потенциалом взаимодействия, которые с физической точки зрепия описывают т.п. разбавленные системы многих частиц. Получена система уравпепий для частных распределений вероятностей, аналогичная системе уравпепий Кирквуда - Зальцбурга, которая применяется для исследования непрерывных систем.
МЕТОД ПОДОБНЫХ ОПЕРАТОРОВ В СПЕКТРАЛЬНОМ АНАЛИЗЕ ОПЕРАТОРНЫХ БЕСКОНЕЧНЫХ МАТРИЦ
Authors: Баскаков А. Г. , Криштал И. А. , Ускова Н. Б.
Published: July 2020

В работе предложена и обосновывается модификация метода подобных операторов в случае, если па собственные значения певозмущеппого оператора не накладывается условие роста лакун между ними. Эта модификация отлична от традиционной схемы, используемой, например, при исследовании оператора Хилла. Все выкладки приводятся па языке матриц операторов. В рассматриваемую схему укладываются, например, дифференциальные операторы первого порядка с ипволюцией, операторы Дирака.
AVALIAÇÃO DA EFICIÊNCIA DE COAGULANTES COMERCIAIS PARA APLICAÇÃO EM SISTEMAS DE TRATAMENTO DE ÁGUA
Authors: Rôla Anoar Kayali Koubeissi , Castro Guilherme Mendes de , Santana Henrique Freitas , Souza José João Lelis Leal de , Silva Deusanilde de Jesus
Published: July 2020

A grande variedade de coagulantes permite que as Estações de Tratamento de Água busquem pelo reagente com melhor custo benefício para remover a turbidez da água bruta. Os principais objetivos deste trabalho foram avaliar a eficiência de remoção de turbidez em águas captadas em período de estiagem usando dois coagulantes comerciais, policloreto de alumínio (PAC) e o Tanfloc-SL, e realizar um estudo de viabilidade econômica levando em conta os gastos com coagulação e desinfecção. Diagramas de coagulação foram utilizados para avaliar a eficiência dos coagulantes em questão. Após a coagulação, algumas amostras foram filtradas e receberam uma carga de solução desinfectante. A eficiência máxima do PAC foi 94%, em pH 7 e dosagem de 28 ppm. Para o Tanfloc-SL, a eficiência foi 92%, em pH 6,95 e dosagem de 17 ppm. Quando comparadas as dosagens para remoção de 90% da turbidez inicial da água bruta, o consumo de Tanfloc-SL em relação ao PAC foi 54% menor. Por outro lado, o consumo de cloro foi 23,58% maior quando o Tanfloc-SLem relação ao PAC. Com os resultados alcançados neste trabalho, pode-se concluir que a subtituição do PAC pelo Tanfloc-SL gerará uma economia de 49,61% considerando os custos com coagulantes e desifetantes.
SINTONIA DO CONTROLADOR PELO MÉTODO DE ZIEGLER E NICHOLS, PARA ESPECIFICAÇÃO DO PRODUTO DE TOPO DE UMA COLUNA DE DESTILAÇÃO
Authors: Braga Eduardo Ramos
Published: July 2020

O presente artigo busca encontrar a sintonização para um controlador para a especificação do produto de topo de uma coluna de destilação, com o intuito de manter o produto sempre na faixa de especificação desejada, podendo gerar grande economia para o processo. Realizou-se a aproximação do sistema em uma função de transferência de primeira ordem, com o auxílio do simulador ControlStation 3.5 e do Excel. Após, encontrou-se os parâmetros de malha aberta como Kp (ganho do processo), t (constante de tempo) minutos e Θ (constante de atraso). Posteriormente, selecionou-se o controlador do tipo PID já que ele é indicado para processos lentos e/ou que não desejam erros residuais e muitas oscilações. Analisou-se três casos: A variação da variável distúrbio, a variação do valor definido (SP) e a partida do processo. Para todos eles os parâmetros do controlador foram determinados pelo método de sintonia de Ziegler e Nichols em malha aberta, obtendo um Kc (ganho do controlador) com valor de 3,957, um Ti (tempo de integração) de 16 minutos e um Td (tempo de derivação) de 4 minutos. Notou-se então que para ambos os casos, os valores encontrados por esta sintonia satisfez todos os critérios pré-estabelecidos. Por fim, comparou-se os resultados obtidos pela sintonia de Ziegler e Nichols com os de outros métodos de sintonia, o que evidenciou ainda mais a sua eficiência.