bluuebunny/crossref_metadata_2025 huggingface dataset:
The effect of calcium fluoride on extracting magnesium from magnesite and calcium carbonate by silicothermal reduction in flowing argon
Authors: Guo J.-H. , Fu D.-X. , Han J.-B. , Ji Z.-H. , Wang Y.-S. , Zhang T.-A.
Published: October 2021

At present, the production of magnesium is mainly carried out semi-continuously with ferrosilicon as reducing agent under high temperature and high vacuum. In order to continuously produce magnesium, a new method of extracting magnesium from low-grade magnesite and calcium carbonate by silicothermal method in flowing inert gas was proposed. The effects of calcium fluoride (CaF2) on decomposition rate, decomposition kinetics, reduction rate of magnesia, and crystal type of dicalcium silicate in reduction slag were investigated in the paper. The experimental results showed that calcium fluoride could accelerate the decomposition of carbonate, and had no side effect on the calcined products. In addition, the analysis results of DTA curves showed that calcium fluoride could reduce the decomposition reaction activation energy and the reaction temperature of carbonate in the prefabricated pellets. The results of reduction experiments showed that proper calcium fluoride could promote the reduction rate of magnesia, and in the temperature range of 1250? ~ 1350?, with the same timeframe, the corresponding calcium fluoride contents were 5%, 3%, and 1% respectively when the reduction rate reached the maximum. Excessive calcium fluoride reduced the reduction rate of magnesia, but it promoted the transformation of dicalcium silicate to ? phase in the reduction slag.
Magnetoelectric properties of materials based on barium zirconium titanate and various magnetic compounds
Authors: Dzunuzovic Adis , Vijatovic-Petrovic Mirjana , Bobic Jelena , Ilic Nikola , Stojanovic Biljana
Published: October 2021

Multiferroic composites containing ferroelectric Ba(Ti0.80Zr0.20)O3
(BT80Zr20) phase and magnetic Ni0.7Zn0.3Fe2O4 (NZF), CoFe2O4 (CF) or
Ni0.7Cu0.01Sm0.05Zn0.29Fe1.95O4 (NCuSmZF) phase were investigated in this
study. Three composites, BT80Zr20-NZF, BT80Zr20-CF and BT80Zr20-NCuSmZF were
prepared by mixing chemically synthesized powders in the planetary mill,
uniaxial pressing and sintering at 1300?C. X-ray diffraction data for the
single phase and composites ceramics indicated the formation of crystallized
structure of both ferrites and barium zirconium titanate, without the
presence of undesirable phases. Microstructure analysis has shown the
formation of two types of nanosized grains, polygonal ferromagnetic andd
rounded ferroelectric grains. Non-saturated hysteresis loops were evident in
all composite samples possibly due to the presence of very high conductive
ferrite phases. The BT80Zr20-CF has shown the lowest conductivity values in
comparison with other two compounds and therefore the highest potential for
ferroelectric application. The impedance investigations confirmed the
presence of different relaxation processes that originate from the grain and
grain boundary contributions. Investigation of J-E relation between leakage
and electric field for the BT80Zr20 and composites revealed the presence of
four possible mechanisms of conduction in these materials.
The Principal’s Leadership and Performance Result
Authors: Annisya Annisya , Ramadan Zaka Hadikusuma
Published: October 2021

Teacher performance was currently not optimal; this can be seen from the low learning outcomes of students. one of the factors that influence the success of teacher performance was the Principal's leadership. Therefore, research was conducted that aimed to analyze the Principal's leadership with the teacher's performance.  The type of research conducted was descriptive qualitative. The data was collected by interviewing head master, 3 school staff and selected students from 2 students. The data collection methods used are interviews, observations, and documentation. Analysis of the data used analysis techniques from Miles and Huberman. The results stated that good principal leadership in planning, organizing, deploying, coordinating, and supervising will affect teacher performance in performing designing tasks, carrying out learning, assessing learning, conducting guidance, and performing additional tasks. So, the Principal's leadership was good, then the teacher's performance was good, which directly affected the quality of learning. To improve teacher performance, the headmaster must conduct a supervised program to help teachers carried out their duties.
Digital Student Songbook as Supporting Thematic Teaching Material in Elementary School
Authors: Desyandri Desyandri , Yeni Indra , Mansurdin Mansurdin , Dilfa Alrizka Hairi
Published: October 2021

The industrial revolution 4.0 and 21st-century skills leave fundamental problems in the implementation of 2013 curriculum teaching materials with an integrated thematic approach, including learning the art of music in elementary schools. It is very important for teachers to integrate technology into learning. The purpose of this research is to develop interactive multimedia in the form of a digital songbook as a support for integrated thematic teaching materials. The type of research that has been used is Research & Development which refers to the ADDIE. The subjects of this study were 4 (four) teachers and 100 elementary school students in the city of Padang. Data collection techniques and instruments were in the form of a questionnaire consisting of a validation questionnaire for validators and a practicality questionnaire given to teachers and students. The data analysis technique was obtained by taking the average results of product validation and practicality. The results showed that the average score of content and graphic validation was 84.1% in the appropriate category, while the average practicality score was 86.7%. Thus, the Digital Song Book is feasible and practical to use in learning the art of music as a support for integrated thematic teaching materials in elementary schools that meaningful for elementary students. The findings of this study have significant implications for designers and teachers, as well as multimedia researchers.
Reinforcement of Character Education Based on School Culture to Enhancing Elementary School Students' Citizenship Character
Authors: Retnasari Lisa , Hidayah Yayuk , Prasetyo Danang
Published: October 2021

The development of the nation's character has not shown progress in the progress of its citizens to become more characterized. The phenomenon is that many people's behavior is not by the character imbued with the Pancasila philosophy. This study aims to analyze the program for strengthening character education based on school culture as a strengthening of the civic character of elementary school students. The method used in this research is descriptive qualitative with data collection in interviews, observations, and documentation. The data analysis technique uses the Miles and Huberman method triangulation. The results showed that the school culture-based character education program is a civic reinforcement for students by familiarizing the main character values in religion, nationalism, independence, cooperation in various school cultural activities. In addition, there is support in the implementation of character education programs as an enhancer of entrepreneurial character in Ngrukeman Yogyakarta Elementary School students, such as adequate infrastructure and teacher training. This paper concludes that the school culture-based character education program as a strengthening of the civic character of students in elementary schools can be implemented with the cooperation of various parties in the school. The recommendations in this article are to explore further the school culture-based character education program, especially in elementary schools.
The Utility of a Novel Blood Based Biomarker in the Diagnosis of Pancreatic Cancer
Authors:   , Nichols Lucy E.
Published: October 2021

Pancreatic cancer maintains one of the worst prognoses of all malignancies. Fewer than 1% of patients survive 10-years post-diagnosis. It is an aggressive disease with as many as 80% of patients diagnosed in the most advanced stages of disease. This severely limits treatment options, contributing to the dismal prognosis. Diagnosis remains a challenge. Often, imaging alone cannot differentiate between benign or malignant disease. Blood-based biomarker CA19-9 cannot be relied upon since it is a modified Lewis antigen so 5-10% of the population do not express it. Tissue biopsies remain the gold-standard for final confirmed diagnoses, yet collection of pancreatic biopsies is invasive, time and resource intensive and have a range of risks associated. Blood-based biomarkers offer a less invasive, cheaper, and more accessible alternative to more traditional diagnostic techniques. Here, we explored the use of novel DNA mutation assay, the human erythrocyte PIG-A assay, as a blood-based biomarker to determine whether it had any potential in diagnosing pancreatic cancer. An elevated frequency of PIG-A mutant erythrocytes was observed within pancreatic cancer patients in comparison to controls of healthy donors and a benign pancreatic disease cohort. Furthermore, the more well-established human peripheral blood mononuclear cell cytokinesis block micronucleus assay provided a secondary measure of DNA damage. An elevation was also viewed in this assay in malignant donors. Both assays were additionally explored within an in vitro setting, modelling the induction of DNA damage by known risk factors for pancreatic cancer. Given the complexity of pancreatic cancer diagnosis, a panel of biomarkers was explored, combining clinical markers of inflammation with our two DNA-based biomarkers and clinically approved CA19-9. Combination of the novel PIG-A mutation assay and CA19-9 blood-test appeared the most suitable panel of biomarkers for future exploration.
Research of metrological capabilities of digital (DDS- and Trueform-) generators
Authors: Pavlenko Yurii , Kirienko Sergii , Ogar Valeriy , Vаsileva Olena
Published: October 2021

Abstract

One of the fundamental improvements of the measurement standard of frequency deviation of frequency-modulated oscillations was the replacement of analog frequency-modulated generators used in DETU 09-03-95 with digital ones based on the principle of direct digital synthesis (DDS) and its next version of Trueform technology. These generators have wider ranges of frequency deviation and modulation frequencies than analog ones, but nonlinear distortion laws of the frequency modulation are not standardized.

The subject of the article is the development of methods and research of these generators and frequency-modulated signals generated by them for nonlinear distortions, accompanying amplitude modulation, frequency noise. Three methods were used in the study: direct measurement; “combination frequencies” and “frequency shift”. The experiment was performed using several measurement methods, which allowed to estimate very small values of nonlinear distortion. Methods were developed and experimental estimations of concomitant amplitude modulation of DDS-generators (in frequency modulation mode), as well as their frequency noise level, were performed. An experimental evaluation of the capabilities of the analog-digital demodulator of the R&S FSL6 spectrum analyzer with the K7 option was performed, its high linearity was shown, its capabilities with respect to the frequency ranges of carrier oscillations and frequency deviation were evaluated. The research results provide a basis for the method of calibration of DDS-generators and demodulator of spectrum analyzers with the K7 option in those ranges where their parameters are not normalized (at direct current up to 8 MHz and F up to 500 kHz).
Optimal data processing in the ballistic laser gravimeter under the effect of correlated interference
Authors: Omelchenko Anatolii , Vinnichenko Oleksandr , Neyezhmakov Pavel , Fedorov Oleksii , Bolyuh Volodymyr
Published: October 2021

Abstract

In order to develop optimal data processing algorithms in ballistic laser gravimeters under the effect of correlated interference, the method of generalized least squares is applied. In this case, to describe the interference, a mathematical model of the autoregression process is used, for which the inverse correlation matrix has a band type and is expressed through the values of the autoregression coefficients. To convert the “path-time” data from the output of the coincidence circuit of ballistic laser gravimeters to a process uniform in time, their local quadratic interpolation is used.

Algorithms for data processing in a ballistic gravimeter, developed on the basis of a method of weighted least squares using orthogonal Hahn polynomials, are considered. To implement a symmetric measurement method, the symmetric Hahn polynomials, characterized by one parameter, are used.

The method of mathematical modelling is used to study the gain in the accuracy of measuring the gravitational acceleration by the synthesized algorithms in comparison with the algorithm based on the method of least squares. It is shown that auto seismic interference in ballistic laser gravimeters with a symmetric measurement method can be significantly reduced by using a mathematical model of the second-order autoregressive process in the method of generalized least squares. A comparative analysis of the characteristics of the algorithms developed using the method of generalized least squares, the method of weighted least squares and the method of ordinary least squares is carried out.
Automated system for identification of data distribution laws by analysis of histogram proximity with sample reduction
Authors: Oliynyk Olha , Taranenko Yurii
Published: October 2021

The error in the identification of the distribution law entails an incorrect assessment of other characteristics (standard deviation, kurtosis, antikurtosis, etc.). The article is devoted to the development of accessible and simple software products for solving problems of identifying distribution laws and determining the optimal size of a data sample.

The paper describes a modified method for identifying the law of data distribution by visual analysis of the proximity of histograms with a reduction in the sample size with software implementation. The method allows choosing the most probable distribution law from a wide base of the set. The essence of the method consists in calculating the entropy coefficient and absolute entropy error for the initial and half data sample, determining the optimal method for processing the histogram using visual analysis of the proximity of histograms, and identifying the data distribution law. The experimental data processing model makes it possible to take into account the statistical properties of real data and can be applied to various arrays, and allows to reduce the sample size required for analysis.

An automated system for identifying the laws of data distribution with a simple and intuitive interface has been developed. The results of the study on real data indicate an increase in the reliability of the identification of the data distribution law.
Повышение энергоэффективности систем электроснабжения транспортных машин
Authors: Швед Андрей
Published: October 2021

Статья содержит обзор технических решений, направленных на повышение энергоэффективности систем электроснабжения транспортных машин. Рассмотрены возможности уменьшения аккумуляторных батарей, создания электромобилей с быстро заменяемыми батареями, снижения экологической нагрузки на окружающую среду.
Formas de governo na retórica
Authors: Leite Priscilla Gontijo
Published: October 2021

Demóstenes é reconhecido como um dos grandes oradores da Antiguidade, sendo também reconhecido por sua atuação política em defesa de Atenas, especialmente de sua democracia e de sua liberdade, avaliando com temeridade o crescimento do poder macedônico. Apesar de a defesa da democracia ser um tema recorrente em sua obra, Demóstenes não é um teórico dela e muito de sua visão sobre esse regime político está ligado a uma idealização da experiência ateniense anterior à Guerra do Peloponeso, período do apogeu da talassocracia. Na construção da defesa da democracia e do êthos do democrata, elementos da oligarquia e do oligarca são utilizados. O objetivo deste artigo é avaliar o uso das formas de governo democracia e oligarquia por Demóstenes e, para tanto, o foco será na construção da antítese entre essas duas formas e a utilização das experiências oligárquicas de 411 e 404 a.C. nesse processo.
Influence du pâturage sur la phytodiversité et la variation de la composition chimique de cinq plantes broutées dans le mont de Tessala (Algérie nord occidentale)
Authors: Cherifi Kouider , Bouker Amar , Benabbou Mohammed , Guemour Djillali , Hasnaoui Okkacha
Published: October 2021

Le but de notre travail est d’évaluer l’impact du pâturage sur la biodiversité végétale des monts de Tessala. Pour cela, six (06) stations situées sur les versants nord et sud de la zone d’étude ont été échantillonnées. Sur chaque station une étude floristique et des analyses pédologiques sont effectuées afin de dégager les principaux facteurs qui interviennent dans la répartition de la végétation. En plus, des enquêtes sur terrain ont été menées afin de réaliser une analyse fourragère et de faire ressortir l’impact du facteur suscité. Dans ce contexte, nous avons comparé l’offre fourragère de cinq espèces appartenant aux familles suivantes: Poaceae, Fabaceae, Plantaginaceae et Papaveraceae, cette comparaison a aboutit à un déficit de 18630,27 UFL, c'est-à-dire un manque de 22975,07 kg de matière sèche pour les six stations. L’analyse factorielle des correspondances (AFC) nous a permis d’identifier deux groupes de stations: le premier groupe (G1) est représenté par les stations S2, S5, et S6 dont l’impact du pâturage est faible parfois moyen. Le deuxième (G2) représente les stations les plus pâturées S1, S3 et S4, reflétant ainsi une banalisation du cortège floristique de ces dernières.
Sobre el nombre Festuca yvesii subsp. graniticola (Kerguélen & Morla) Mart.-Sagarra & Devesa
Authors: Martínez Sagarra Gloria , Devesa Juan Antonio
Published: October 2021

Se revisa la nomenclatura de Festuca yvesii subsp. graniticola (Kerguélen & Morla) Mart.-Sagarra & Devesa y se propone una nueva combinación.
A note on the solvability of homogeneous Riemann boundary problem with infinity index
Authors: Bory-Reyes Juan
Published: October 2021

In this note we establish a necessary and sufficient condition for solvability of the homogeneous Riemann boundary problem with infinity index on a rectifiable open curve. The index of the problem we deal with considers the influence of the requirement of the solutions of the problem, the degree of non-smoothness of the curve at the endpoints as well as the behavior of the coefficient at these points.
Gross Morphology of the Brain and Spinal Cord of the African Pygmy Hedgehog (Atelerix albiventris)
Authors: Igado O. O. , Braimah S. F. , Obasa A. A.
Published: October 2021

The African pygmy hedgehog (Atelerix albiventris) is an insectivorous animal, native to Africa. The central nervous system (CNS) consists of the brain and the spinal cord, protected by the cranium and vertebral column respectively. Assessment of the gross appearance and morphometries of the African pygmy hedgehog CNS were carried out using six adults (3 males and 3 females). The gross examination showed the brains to be lissencephalic, with relatively large olfactory bulbs, similar to that observed in some rodents. The rootlets of the first cervical spinal nerves were observed to emerge before the foramen magnum. Linear measurements were obtained from both the brain and spinal cord. The mean weight of the animals was 199.00 ± 16.09 g, with the males having an average body weight of 183.50 ± 12.02 g and the females 206.80 ± 11.95 g. Although not statistically significant, the males had a higher encephalisation quotient (0.40 ± 0.08) relative to the females 0.36 ± 0.04). The values for the brain weight, length of spinal cord and heights of the telencephalon and diencephalon at different points were higher in the males, while the spinal cord weight, length of brain and cerebellar height were higher in the females. The spinal cord showed slight enlargements at the cervical, thoracic, lumbar and sacral segments. This study aimed to provide baseline data for the study of the gross appearance and neuromorpho-metrics of the hedgehog, with possible application in regional anaesthesiology and comparative wildlife neuroanatomy.
Spontaneous alteration of blood pH by a bicarbonate buffer system during experimental hypercalcaemia in cows
Authors: Ro Younghye , Choi Woojae , Hong Leegon , Kim Eunkyung , Choe Eunhui , Kim Danil
Published: October 2021

Introduction

Maintaining mineral homeostasis as well as the secretion and metabolism of mineralotropic hormones is important for healthy of periparturient dairy cows. To increase the activity of mineralotropic hormones, blood pH can be adjusted. The purpose of this study was to investigate changes in blood pH and the mechanism of action of this change in induced hypercalcaemic cows.

Material and Methods

Six non-lactating Holstein cows were used in a 2 × 2 crossover design. To induce hypercalcaemia, calcium borogluconate was administered subcutaneously to experimental cows and normal saline was administered subcutaneously to control cows. Blood and urine samples were collected serially after administration. Whole blood without any anticoagulant was processed with a portable blood gas analyser. Plasma concentration and urinary excretion of calcium were measured.

Results

In hypercalcaemic cows, both blood and urine calcium levels were significantly increased at 8 h compared to those at 0 h (P < 0.05), and a spontaneous increase in blood pH was also observed. The calcium concentration in plasma was highest at 2 h after administration (3.02 ± 0.27 mmol/L). The change in pH correlated with that in bicarbonate (r = 0.781, P < 0.001) rather than that in partial pressure of CO2 (r = 0.085, P = 0.424).

Conclusion

Hypercalcaemia induced a spontaneous change in blood pH through the bicarbonate buffer system and this system may be a maintainer of calcium homeostasis.
Connecting the Dots: Exploring the Knowledge-based Antecedents of SMEs’ Profitability and Development via International Ventures
Authors: Andrei Andreia Gabriela , Dincă Violeta-Mihaela , Mitan Andreea , Vătămănescu Elena-Mădălina
Published: October 2021

As shifts occur on the global market and business models adapt to a dynamic environment, the process of business internationalization, as performed by small and medium-sized enterprises (SMEs), maintains its relevance for academics, professionals, international organizations, and authorities. Studies in the field have emphasized the strategic component of internationalization, linking it to cultivating (sustainable) competitive advantages, to stimulating strategic innovation, to the pursuit of profitability, and to an overall improved performance, taking into account the activities conducted on foreign markets. Based on a survey carried out with over 100 European SMEs in the steel field, this study examines the influences of strategic collaborators (from international business networks), intermediaries (as organizational links to the target stakeholders), and strategic innovation on SMEs’ profitability resulted from international operations, and on the level of business development on foreign markets. The results have shown positive influences among most of the considered factors (i.e., direct collaborators, strategic innovation, international profitability and development), whereas intermediaries have a significant influence only on international profitability and not on SMEs’ development on foreign markets.
Perception of car brands with an emphasis on expected benefits and features as prerequisites for customer satisfaction
Authors: Janoskova Katarina , Kral Pavol , Popescu Gheorghe H. , Rowland Zuzana , Kramarova Katarina
Published: October 2021

Brand management plays a crucial role in increasing the loyalty of current customers as well as in gaining new customers. The product brand significantly influences shopping behaviour of customers. Many customers prefer branded products to non-branded ones. Some of them prefer branded products in general; some of them prefer branded products only for selected products. This paper is focused on the analysis of the perception of ten favourite car brands by Slovak consumers with an emphasis on the quality, prestige, image and expected benefits and features. The aims of the paper are divided into three main parts: i) find out the selected car brand rank based on the influence on the purchasing behaviour of Slovak consumers; ii) assess the impact of selected socio-demographic characteristics on the expected benefits as well as on the features that the respondent´s chosen car brand should have; iii) identify the main reason why respondents focus on preferred car brands. The correlation of these factors was tested on a sample of 2002 respondents from the Slovak republic. The analysed data represent a partial result of an extensive survey. The chosen mathematical-statistical methods such as correlation analysis and testing of statistical hypotheses were applied to fulfil the purpose of the research. Based on a survey, the most influential car brands include Skoda and Volkswagen. Especially the Skoda brand has a significant position in Slovakia, given by tradition, history and place of production of these cars.
Peter Ackroyd’s Distorted Psychogeography
Authors: Garayeva Khanim
Published: October 2021

This paper focuses on Peter Ackroyd’s unique type of psychogeographical writing. Therefore, apart from an overall elaboration on his works about London, it addresses his historiographic metafictional novels Hawksmoor (1985) and The House of Doctor Dee (1993). These esoteric novels provide insight into Ackroyd’s writing about the city in different time periods and make it possible to delve deeper into what this paper argues is his distinctive manner of implementing the notions of psychogeography. At the same time, it draws parallels from classical and contemporary psychogeography where appropriate and highlight his utilisation of it. The main aim of this paper is to reveal the ways in which Peter Ackroyd uses walking in the city to reflect its manipulative power over his characters which results in the transformation of their identities.
Cardiac biomarkers alterations in patients with SARS-CoV-2 infection
Authors: Oikonomou Eleousa , Paraskevas Themistoklis , Velissaris Dimitrios
Published: October 2021

Reliable biomarkers are necessary for the risk stratification of patients infected with SARS-CoV-2. This novel coronavirus is now established to affect several organs in addition to the lungs, most prominently the heart. This is achieved through direct damage to the myocardium and indirect immune-associated effects during the cytokine storm. We performed a literature review aiming to identify the prognostic value of alterations of cardiac biomarkers in SARS-CoV-2 infection. Cardiac biomarkers are significantly elevated in patients with severe COVID-19 and are independent predictors of mortality. High-sensitivity troponin I and T are correlated with multiple inflammatory indexes and poor outcomes. Although cut-off values have been established for most of cardiac biomarkers, lower limits for troponins may have better prognostic values and longitudinal monitoring of cardiac biomarkers can help the clinician assess the patient’s course. Additional measurements of NT-proBNP, can detect the subgroup of patients with poor prognosis.
Les traces des traces de la Première Guerre mondiale : la représentation photographique des lieux de conflit et ses enjeux mémoriels
Authors: Béhague Emmanuel
Published: October 2021

Consacrée à la photographie des lieux dans lesquels se sont déroulés les combats de la Première Guerre mondiale, cette contribution se penche sur la signification mémorielle des choix esthétiques. Traces photographiques des traces physiques laissées par les conflits dans l’espace, la représentation photographique doit être interrogée, dans la mesure où elle revêt une signification collective : aspirant à investir l’espace public d’une part, les images disposent d’autre part d’une performativité qui leur est propre et influent de ce fait sur le réel. Après nous être arrêtés sur la notion de trace comme point de rencontre entre la photographie et son objet, puis sur la signification collective de la représentation photographique, nous nous intéresserons à titre d’exemple au travail de Michael St Maur Sheil, Guillaume Amat et Paola de Pietri, trois photographes cherchant à exprimer à travers la photographie des lieux du conflit la nécessité d’une résistance à l’oubli.
COVID Vaccine Transport, Storage, and Distribution: Cold Chain Management to Ensure Efficacy
Authors: Rusnack Michael
Published: October 2021

The Vaccines for Children Program (VFC) is a federally funded program in the United States, providing vaccines to children who lack health insurance or who otherwise cannot afford the vaccination cost. The VFC program was created in 1993 and is required to be a new entitlement of each State's Medicaid plan. The program was officially implemented in October 1994 and served eligible children in all United States (US). Other countries, the United Nations (UN), and the World Health Organization (WHO), have similar programs.
 A critical aspect of these programs is the guidance surrounding the environmental monitoring of the materials. To best maintain the integrity of these products, specific storage parameters are required. It is necessary to store most vaccines at refrigeration or freezing temperatures. To best assure the efficacy of the vaccines, monitoring standards and equipment are specified. The technology and methodologies may be adequate for these programs' materials; these same methods are not for the COVID vaccine.[1]
 When reviewing the guidance recommendations worldwide, one may observe commonalities in the program. Each guidance calls for the use of digital data loggers (DDL), sampling rates of 15 to 30 minutes, daily check-in (during business hours), and the use of a temperature buffer, each without specificity.[2]
The inadequacies of the VFC program monitoring methodologies fall far short when monitoring COVID vaccines. Herein considerations for the transport, storage, and distribution of the COVID vaccine cold chain will be discussed.
Perfil epidemiológico da sífilis congênita no estado de Minas Gerais
Authors: Nagai Michelly Martins , Andrade Andressa Ferreira , Bispo Débora Braga Soares , Cassimiro João Carlos , Andrino Leilany Marins , Queiroz Marcele Soares Côrtes , Matos Samara Elisy Miranda , Peixoto Marisa Costa e
Published: October 2021

Objetivo: Descrever o perfil epidemiológico da sífilis congênita no estado de Minas de Gerais, com base nos dados do DATASUS no período de 2014 a 2018, a fim de suscitar a busca, prevenção e controle dessa IST. Métodos: Trata-se de um estudo quantitativo, descritivo, transversal. Foram levantados os casos confirmados de Sífilis Congênita dos últimos cinco anos disponíveis no Sistema de Informação de Agravos e Notificação (SINAN – DATASUS), no estado de Minas Gerais. Os dados foram estruturados em tabelas, apresentando distribuição absoluta e relativa das variáveis associadas ao agravo. Resultados: Foi revelado aumento no número absoluto de diagnósticos de sífilis congênita no período em todas as categorias. No entanto, notou-se que os números de diagnósticos realizados durante o parto/curetagem e após o parto diminuíram, com uma redução de 1,3% e 4,2% respectivamente, enquanto o número de diagnósticos feitos durante o pré-natal aumentou 5,7%. Esses dados reforçam o aumento da cobertura e da efetividade do pré-natal nos últimos anos. Conclusão: Observa-se aumento expressivo na incidência da sífilis congênita, que é diagnosticada predominantemente durante o pré-natal. A análise do perfil epidemiológico da sífilis congênita é primordial para o manejo adequado, com intuito de realizar detecção e tratamento precoces evitando complicações.
Application of the vertical model of the seasonally thawed layer for the Tulik Lake area (Alaska)
Authors: Белолипецкий Виктор Михайлович , Генова Светлана Николаевна
Published: October 2021

Практический интерес в районах вечной мерзлоты представляет глубина сезонного оттаивания. Построена одномерная (в вертикальном направлении) упрощенная полуэмпирическая модель динамики вечной мерзлоты в “приближении медленных движений границ фазового перехода”, основанная на задаче Стефана и эмпирических соотношениях. Калибровочные параметры модели выбираются для исследуемого района с использованием натурных измерений глубины оттаивания и температуры воздуха. Проверка работоспособности численной модели проведена для района оз. Тулик (Аляска). Получено согласие рассчитанных значений глубины талого слоя и температуры поверхности почвы с результатами измерений

Due to the change in global air temperature, the assessment of permafrost reactions to climate change is of interest. As the climate warms, both the thickness of the thawed soil layer and the period for existence of the talik are increased. The present paper proposes a small-size numerical model of vertical temperature distributions in the thawed and frozen layers when a frozen layer on the soil surface is absent. In the vertical direction, thawed and frozen soils are separated. The theoretical description of the temperature field in soils when they freeze or melt is carried out using the solution of the Stefan problem. The mathematical model is based on thermal conductivity equations for the frozen and melted zones. At the interfacial boundary, the Dirichlet condition for temperature and the Stefan condition are set. The numerical methods for solving of Stefan problems are divided into two classes, namely, methods with explicit division of fronts and methods of end-to-end counting. In the present work, the method with the selection of fronts is implemented. In the one-dimensional Stefan problem, when transformed to new variables, the computational domain in the spatial variable is mapped onto the interval [0 , 1]. In the presented equations, the convective terms characterize the rate of temperature transfer (model 1). A simplified version of the Stefan problem solution is considered without taking into account this rate (“approximation of slow movements of the boundaries of the phase transition”, model 2). The model is tuned to a specific object of research. Model parameter values can vary significantly in different geographic regions. This paper simulates the dynamics of permafrost in the area of Lake Tulik (Alaska) in summer. Test calculations based on the proposed simplified model show its adequacy and consistency with field measurements. The developed model can be used for qualitative studies of the long-term dynamics of permafrost using data of the air temperature, relative air humidity and precipitation
Knowledge management in the mirror of the Russian Scientific Citation Index
Authors: Бобров Леонид Куприянович
Published: October 2021

В работе предпринята попытка наукометрического анализа развития области управления знаниями на материалах Российского индекса научного цитирования (РИНЦ). Динамика числа публикаций по управлению знаниями, содержащихся в РИНЦ, рассматривалась в сопоставлении с динамикой аналогичных публикаций в базах данных Web of Science, Scopus и ScienceDirect. Показано, что наблюдаемая положительная динамика мировой публикационной активности по проблемам управления знаниями и онтологическому проектированию коррелирует с динамикой развития мирового рынка управления знаниями. Статистика публикаций РИНЦ свидетельствует о том, что наиболее обсуждаемыми в научной печати являются решения с использованием онтологических моделей. Тенденция к снижению частоты встречаемости терминов управление знаниями и онтология в заглавиях публикаций и ключевых словах предположительно объясняется тем, что публикации по управлению знаниями и онтологиям становятся все более сфокусированными на решении технологических проблем, что влияет на терминологический состав заглавий и ключевых слов. На основе анализа данных РИНЦ построены топ-списки наиболее продуктивных организаций и авторов публикаций по управлению знаниями и онтологиям

The aim of the paper is to analyze the publication activity of the Russian writing authors and research organizations published in the field of knowledge management. The study was analysed bibliometric methods, statistical analysis, and analytical tools provided by the Russian Science Citation Index (RSCI), SCOPUS, Web of Science, and Science Direct. Overall, the study accounts for 363695 SCOPUS documents, 111015 Web of Science documents, 41546 Science Direct documents, and 27072 RSCI documents. The dynamics of the number of publications in the RSCI was compared with the dynamics for Scopus, Web of Science, and Science Direct publications. It was found out that the positive dynamics of the world publication activity on knowledge management problems correlates with the dynamics of the world knowledge management market. It has been shown that the RSCI publications that use solutions based on the ontological models were among the most discussed. The greatest publication activity in the field of knowledge management and ontological design is demonstrated by Universities and research institutes located in Moscow and St. Petersburg, but also in Ulyanovsk, Samara, Yekaterinburg, Novosibirsk and Tomsk. The most cited authors are working in the A.P. Ershov Institute of Informatics Systems (Novosibirsk), the Samara National Research University, and the Ulyanovsk State Technical University. An analysis of the RSCI citation indexes have showed that the fundamental works of Russian scientists devoted to the scientific and methodological foundations of knowledge management and published in the period from 1992 to 2008 are still in demand today.
A Survey of Students’ Attitudes to Big Data Analysis in Iranian Universities
Authors:   Department of Medical Informatics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran, E Nazari , S Norouzi ,   Department of Medical Informatics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran, T Aldaghi ,   Department of Industrial Engineering, Eqbal Lahouri Institute of Higher Education, Mashhad, Iran, M Rasoulian ,   Department of Medical Informatics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran, MH Shahriari ,   Department of Electrical Engineering, Faculty of Computer Engineering, University of Isfahan, Isfahan, Iran, A Kheirdoust ,   Department of Medical Informatics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran, H Tabesh ,   Department of Medical Informatics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
Published: October 2021

Introduction: Today, with the emergence of new technologies and massive data, big data analysis has attracted the attention of researchers, industries and universities on a global scale. The present research aims to explore students’ attitude to big data analysis in different fields of study. Methodology: The present cross-sectional study was conducted with students at different universities and fields of study in Iran. A questionnaire was developed. This questionnaire explored students’ attitude toward big data analysis. To this aim, 359 university students participated in the research. The data were analyzed using descriptive and inferential statistics. Results: The age of the students ranged between 25 and 34 years. 55.2% were female and 54% were economically active. 40.9% had a work experience of less than a year. The academic degree of the majority of participants was master’s degree. 93.9% of the participants believed that big data analysis was essential for the country. 43.2% maintained that big data mostly belonged to the communication industry. 28.1% perceived MATLAB useful software for analysis. 40.9% were familiar with the benefits of analysis. Engage in economic activities, less than 1 year of experience and studies for a Master’s degree showed to be significantly correlated with familiarity with the benefits of big data (p=0.01). Such issues as high costs, managers’ unfamiliarity and lack of expertise and complexity were raised by the respondents.
Comparative study of hemodynamic effects, quality of extubation and emergence - agitation response of the patients with dexmedetomidine versus lignocaine during and following the endotracheal extubation
Authors:   Associate Professor, Department of Anaesthesia, JMF'S ACPM Medical College, Dhule, Maharashtra, INDIA., Panat Manasi
Published: October 2021

Background: Endotracheal extubation is the translaryngeal removal of a tube from the trachea via the nose or mouth. It is associated with hemodynamic changes because of reflex sympathetic discharge caused by epipharyngeal and laryngopharyngeal stimulation. Various drugs and techniques have been tried to attenuate the airway and stress responses during tracheal extubation. In present study, we have compared the effects of dexmedetomidine and intravenous lignocaine on the hemodynamic and recovery profiles during endotracheal extubation. Material and Methods: Present study was prospective randomised comparative study, conducted in patients from age group of 18-45 years, ASA grade I/II, scheduled for elective abdominal surgeries. The patients were categorised into two different groups using the sealed envelope method as Group D and group L. Results: In present study, patients were divided in following 2 groups with 50 patients in each group as group D (Dexmedetomidine) and group L (Lignocaine). Age, gender, mean BMI were comparable in both groups and difference was not significant statistically. The difference between mean heart rate, systolic BP, diastolic BP and mean arterial BP during extubation, after extubation at 1, 3, 5, 10, 15, 20, 25, 30 minutes in dexmedetomidine group and lignocaine group was statistically significant. In Dexmedetomidine group, 12% of the patients had no cough during extubation, 72% of the patients had smooth extubation with minimal cough while in Lignocaine group, 22% of the patients had smooth extubation with minimal cough, 74 % of the patients had moderate cough during extubation. Statistical analysis of the Emergence agitation score shows better results in group D. Conclusion: Administration of Dexmedetomidine before tracheal extubation was more effective in maintaining the hemodynamic stability, facilitated smooth tracheal extubation and had a better quality of recovery as compared to Lignocaine.
Study the prevalence of Pulmonary Tuberculosis and HIV co-infection in all Pulmonary Tuberculosis patients at tertiary health care centre
Authors:   Assistant Professor, 3Professor And Head, Department of Respiratory Medicine, Shri Vasantrao Naik Govt Medical College Yavatmal, INDIA., Mutyepod Sanjay Girmaji
Published: October 2021

Background: Co-infection of Human Immunodeficiency Virus (HIV) and tuberculosis(TB) is considered to be one of the emerging medical conditions responsible for huge social and economic burden globally. Tuberculosis is leading cause of mortality among people living with HIV/AIDS. Methodology: The present cross-sectional study was carried out in a tertiary care centre of a city in Maharashtra between the periods of 1st August 2019 to July 2020. Study population were IPD patients from department of pulmonary medicine of tertiary health care centre. Sampling technique: Every fifth PTB diagnosed patient admitted in ward of pulmonary medicine department was included in the study till the sample size was achieved. The data was entered to excel sheet and analyzed by Windows 10 excel software. Result: study subjects were from age group 16-30 years of age, in this age group 2 (0.75%) patient was co-infected with PTB and HIV. 86(32.33%) study subjects were from age group 31 – 45 years of age from this age group 8 (3.00%) patients were HIV PTB co-infected. 2(0.75%) patient was there in age group 13-15 years of age. Symptoms of study subjects in PTB with HIV patients most common symptoms were weight loss(100%), Loss of appetite(100%) and evening rise of fever (85.71%).While in PTB without HIV patients loss of appetite evening rise of fever and weight loss was most common symptoms. In patients of PTB and HIV co-infection, sputum smear positive rate was lower, 6 out of 14 patients (42.86%) as compared to patients without PTB and HIV co-infection, 148 out of 252(i.e., 58.73%). Conclusion: It can be concluded from our study that there is difference n demography of HIV co-infection with Tuberculosis also it differed in clinical and radiological features also we have noted that the mortality of HIV –TB co-infection was having higher mortality i.e. 14.28% as compared to without co-infection i.e. 3.96%, hence prompt treatment by antiviral drugs and timely screening for TB and timely treatment is mandatory.
СОВРЕМЕННАЯ ИНВЕСТИЦИОННАЯ ПОЛИТИКА РЕГИОНА: проблемы и перспективы (на примере РД)
Authors: Арсланов Шамиль Джавадович
Published: October 2021

Целью настоящего исследования является попытка определить состояние и пути развития инвестиционной сферы региона, а также выявить факторы и проблемы, снижающие эффективность проводимой инвестиционной политики. В работе исследована инвестиционная сфера Республики Дагестан, с учетом анализа ее рейтинга среди регионов РФ по основным инвестиционным и социально-экономическим показателям. Выявлены основные проблемы и тенденции региональной инвестиционной политики, на основе исследования деятельности органа государственной власти, формирующего и реализующего инвестиционную политику региона, а также на основе анализа закономерностей формирования и развития инвестиционного законодательства региона. Результаты исследования могут быть применены в ходе формирования и реализации как региональной инвестиционной политики в целом, так и ее структурных элементов в отдельности. По итогам исследования выявлены негативные тенденции формирования и реализации инвестиционной политики РД, отрицательно сказывающиеся на региональном инвестиционном климате и привлекательности. Установлено, что РД необходимо преодолеть негативные тенденции своего инвестиционного развития, оптимизировав деятельность органов государственной власти, повысив качество принятых и принимаемых региональных инвестиционных законов, а также стимулируя развитие цифровизации инвестиционной деятельности.