bluuebunny/crossref_metadata_2025 huggingface dataset:
A história que o filme Radioactive não conta e a percepção de alunos de licenciatura em física
Authors: Santos Carlos Alberto dos , Silva Leandro Londero da
Published: April 2021

Apresentamos os resultados de um estudo que analisa o uso do filme Radioactive como vetor de popularização da ciência e como recurso didático para a discussão de aspectos sociológicos da atividade científica e da natureza da ciência na formação inicial de professores de física. Para tanto, analisamos o filme sob o ponto de vista de sua correspondência com os fatos históricos e discutimos como os alunos o perceberam durante sua exibição em um curso de licenciatura em física. A análise evidencia que a cinebiografia apresenta equívocos históricos que podem gerar uma compreensão errônea do contexto abordado na obra. A presente intervenção didática indica que o enredo de Radioactive pode ser usado para a introdução de discussões sobre um conteúdo da física do século 20 e para o debate de elementos da natureza da ciência, na medida em que envolveu os estudantes em formação inicial na apreciação do conteúdo histórico e científico apresentado, bem como na reflexão e comparação sobre as ideias que possuíam sobre a radioatividade e aquelas apresentadas no filme. Os licenciandos consideraram o filme um recurso potencialmente útil, desde que se leve em consideração a contextualização da obra no cenário dos registros históricos.
Photosynthetic efficiency and production of Annona squamosa L. under salt stress and fertilization with NPK
Authors: Ferreira Fagner N. , Lima Geovani S. de , Gheyi Hans R. , Sá Francisco V. da S. , Dias Adaan S. , Pinheiro Francisco W. A.
Published: April 2021

HIGHLIGHTS Electrical conductivity of water of 3.0 dS m-1 reduces the chlorophyll synthesis and production of custard-apple. NPK recommendation of 100-125-125, 125-125-100 and 125-125-125% cause more damage to the cell membrane. Reduction in the quantum efficiency of custard-apple under salt stress is indicative of photoinhi-bitory damage.
Mulch with sugarcane bagasse and bamboo straw attenuates salt stress in cowpea cultivation
Authors: Barbosa Inácio J. , Sousa Henderson C. , Schneider Fernanda , Sousa Geocleber G. de , Lessa Carla I. N. , Sanó Lamine
Published: April 2021

HIGHLIGHTS Saline stress did not affect the initial growth of the cowpea crop. The use of mulch provides better morphological results in the cowpea crop. Vegetal mulches as soil protection (sugarcane bagasse and bamboo straw) attenuated effect of salts on gas exchange of cowpea.
Clinical characteristics of older patients with COVID-19: a systematic review of case reports
Authors: Córdova Luisser Dainner Saavedra , Vega Alexander Pieter Mayor , Luján-Carpio Elmer , Parodi José Francisco , Moncada-Mapelli Enrique , Armacanqui-Valencia Isai , Salvador-Ruiz Jhonatanael , Pawer-Pucurimay Dalia , Ydrogo-Cruz Erickson , Chevarría-Arriaga Mylenka Jennifer , Ganoza-Farro Macarena , Meza-Romero Araceli , Zegarra-Rodríguez Cynthia Alejandra , Albán-Murguia Pedro Gustavo , Bailón-Valdez Zaira , Palacios-Garcia Naheilli , Quevedo-La-Torre Danae , Alcós-Mamani Angelica Lizeth , Gómez-Martel Luisa Alisson , Roca-Moscoso Max Antonio , Gamboa-Orozco Martin , Salazar-Granara Alberto
Published: April 2021

ABSTRACT. In the context of the current COVID-19 pandemic, higher morbidity and mortality have been reported in older adults. This age group presents physiological changes and its own clinical conditions such as frailty, dementia, among others. Objective: To describe the characteristics of COVID-19 patients, both over and under 80 years old, by conducting a systematic review of the literature describing case reports, and to summarize and critically assess these characteristics. Methods: Systematic review. The study was registered on the Registry of Health Research Projects (PRISA) of the Peruvian National Institute of Health (code EI00000631). Five electronic databases (Scopus, PubMed, PubMed Central, LILACS, and SCIELO) were systematically searched during the period between December 31, 2019 and April 16, 2020. The search focused on case reports, case studies, and case series of older people with COVID-19 infection aged over or under 80 years. When selecting the cases, priority was given to clinical and epidemiological profile, laboratory and imaging patterns, and comprehensive geriatric evaluation. Results: 1,149 articles were identified; after applying the filters, a total of 15 publications of case reports and complete records of 27 older adults were obtained. The most frequent age group was between 60 to 69 years old. There is little literature regarding case reports of older adults aged over 80 years. The most frequent parameters were hypertension, fever, cough, respiratory distress, ground-glass opacification in chest radiography and tomography. Furthermore, decrease in PaO2/FiO2 ratio and lymphocytes, and increase in C-reactive protein and Interleukin 6 were observed. Conclusions: This systematic review found little available information of patients under 80 years old, and far less for those over 80 years old, and an absence of comprehensive geriatric assessment.
Changes in executive function and gait in people with mild cognitive impairment and Alzheimer disease
Authors: Cezar Natália Oiring de Castro , Ansai Juliana Hotta , Oliveira Marcos Paulo Braz de , Silva Danielle Chagas Pereira da , Vale Francisco Assis Carvalho , Takahashi Anielle Cristhine de Medeiros , Andrade Larissa Pires de
Published: April 2021

ABSTRACT. Changes in executive function and motor aspects can compromise the prognosis of older adults with mild cognitive impairment (MCI) and favor the evolution to dementia. Objectives: The aim of this study was to investigate the changes in executive function and gait and to determine the association between changes in these variables. Methods: A 32-month longitudinal study was conducted with 40 volunteers: 19 with preserved cognition (PrC), 15 with MCI and 6 with Alzheimer disease (AD). Executive function and gait speed were assessed using the Frontal Assessment Battery, the Clock-Drawing test and the 10-meter walk test. For data analysis, the Pearson product-moment correlation, two-way repeated-measures ANOVA, and chi-square were conducted. Results: After 32 months, an improvement in the executive function was found in all groups (p=0.003). At baseline, gait speed was slower in individuals with MCI and AD compared to those with PrC (p=0.044), that was maintained after the follow-up (p=0.001). There was significant increase in number of steps in all groups (p=0.001). No significant association was found between changes in gait speed and executive function. Conclusions: It should be taken into account that gait deteriorates prior to executive function to plan interventions and health strategies for this population.
Vascular mild cognitive impairment and its relationship to hemoglobin A1c levels and apolipoprotein E genotypes in the Dominican Republic
Authors: Medrano Martin , Castro-Tejada Gelanys , Lantigua Rafael , Silvestre Gretel , Diaz Sergio , Mota Patricia , Diaz-Garelli Franck
Published: April 2021

ABSTRACT. Dementia and vascular mild cognitive impairment (VaMCI) currently impose a tremendous human and economic burden on patients from aging populations and their families worldwide. Understanding the interplay of cardiometabolic risk factors and apolipoprotein E (APOE) may direct us to a more personalized medicine and preventative care in MCI and dementia. Objective: To evaluate the relationship of cardiometabolic risk factors with MCI and assess the APOE genotype’s role in an elderly cohort in the Dominican Republic. Methods: We studied a cohort of 180 participants 65 years of age and older using a combined assessment of cardiometabolic risk factors, neuropsychological battery tests, and APOE genotyping. We used the number of failed tests as a proxy to predict MCI. Results: We found that patients with the ε3-ε4 APOE genotype had 2.91 higher number of failed cognitive tests (p=0.027) compared to patients with the ε3-ε3 genotyped. The rate of test failures increased 10% (p=0.025) per unit increase in HbA1c percentage. Conclusions: Increased Hemoglobin A1c levels and ε3-ε4 APOE genotypes seem to have an association with the development of VaMCI.
Feasibility of action observation effect on gait and mobility in idiopathic normal pressure hydrocephalus patients
Authors: Hnin Htet Htet , Bovonsunthonchai Sunee , Witthiwej Theerapol , Vachalathiti Roongtiwa , Ariyaudomkit Rattapha
Published: April 2021

ABSTRACT. Action observation (AO) has been proved to be of benefit in several neurological conditions, but no study has previously been conducted in idiopathic normal pressure hydrocephalus (iNPH). Objective: This study aimed to investigate the feasibility of AO in iNPH patients. Methods: A single-group pretest-posttest design was conducted in twenty-seven iNPH patients. Gait and mobility parameters were assessed using the 2D gait measurement in the timed up and go (TUG) test for two trials before and after immediate AO training. The outcomes included step length and time, stride length and time, cadence, gait speed, sit-to-stand time, 3-m walking time, turning time and step, and TUG. In addition, early step length and time were measured. AO consisted of 7.5 min of watching gait videos demonstrated by a healthy older person. Parameters were measured twice for the baseline to determine reproducibility using the intraclass correlation coefficient (ICC3,1). Data between before and after immediately applying AO were compared using the paired t-test. Results: All outcomes showed moderate to excellent test-retest reliability (ICC3,1=0.51 0.99, p<0.05), except for the step time (ICC3,1=0.19, p=0.302), which showed poor reliability. There were significant improvements (p<0.05) in step time, early step time, gait speed, sit-to-stand time, and turning time after applying AO. Yet, the rest of the outcomes showed no significant change. Conclusions: A single session of AO is feasible to provide benefits for gait and mobility parameters. Therapists may modify this method in the training program to improve gait and mobility performances for iNPH patients.
Cross-sectional associations between cognition and mobility in Parkinson’s disease
Authors: Sousa Nariana Mattos Figueiredo , Macedo Roberta Correa , Brucki Sonia Maria Dozzi
Published: April 2021

ABSTRACT. Cross-sectional studies show an association of decline in mental flexibility and inhibitory control with reduced gait speed and falls, as well as divided attention deficit and difficulty in initiating gait. Objective: To investigate the relationships between cognitive function and gait performance in patients with Parkinson’s disease (PD) who participated in a hospital neurorehabilitation program. Methods: A total of 107 patients (79 males, 28 females; mean age 61.00±8.2 years; mean schooling 11.7±4.1 years) with idiopathic PD (mean disease duration 5.5±4.1 years) were recruited for this study. Among them, 78.50% were in stages I and II of the Hoehn & Yahr Scale. Cognitive functions were evaluated through the Digit Span test, Trail Making Test, and Addenbrooke’s Cognitive Examination III. Motor function was assessed with the 10-Meter Walk Test, the short version of the Balance Evaluation Systems Test (Mini-BESTest), and the Timed Up and Go Test. Results: Balance skills were significantly correlated with global cognition and specific domains, including divided attention, verbal fluency, and visuospatial function. Functional mobility showed a significant association with all cognitive tests, except for the number of errors on TMT-A. Gait speed presented a significant correlation with global cognition scores, memory, and attention, including divided attention. Conclusions: These findings might help early identification of cognitive deficits or motor dysfunctions in PD patients who may benefit from rehabilitation strategies, as well as facilitate fall risk assessments and strategies to prevent falls. Future prospective studies are needed to investigate the effects of cognitive training on motor performance, since the difficulty in motor rehabilitation may be more related to cognitive loss than to motor damage.
Extramural gerontology management devising an integrating record for a geriatric care service, an experience report
Authors: Lima-Silva Thais Bento , Almeida Evany Bettine de , Borges Felipe Souza Peito Silva , Ordonez Tiago Nascimento , Domingues Marisa Accioly Rodrigues
Published: April 2021

ABSTRACT. The Gerontological Care Plan is idealized through case management that includes in its aspect engaging the elderly, self-care and the acquisition and maintenance of health-promoting behaviors. Objective: To evaluate the importance of a gerontological care plan, in a geriatric service of a referral hospital in the city of São Paulo. Methods: Fifteen older adult patients were interviewed and the Gerontological Care Plan (PAGe) was applied. Results: Most respondents were classified as independent for instrumental activities of daily living, 42% of whom lived alone. Data from 277 yellow sheets were analyzed, that is, referral forms, in which it was found that the most affected areas were: social work and psychology. For the social worker, the most recurring requests were: verification of the social support network, namely lack of companion and caregiver, with 53%; family problems, with 20%; lack of adherence to treatment, 12%, and problems related to medication, 10%. In the area of psychology, 82% of referrals were due to the need for psychological support, psychotherapy, and help with family problems, depression and grief. Conclusions: A gerontological management proposal was developed within the Geriatric Services of Hospital das Clínicas. The management plan was intended to integrate the actions carried out by the interprofessional team, through the creation of an Integrating Form that allowed the gerontologist to propose, execute and implement a plan of care, follow-up, and monitoring of cases, including the extra context-hospital.
Cognitive performance of older adults with a low level of education with and without depression
Authors: Bomfim Ana Julia de Lima , Chagas Natália Mota de Souza , Leal Lívio Rodrigues , Pessoa Rebeca Mendes de Paula , Ferreira Bianca Letícia Cavalmoretti , Chagas Marcos Hortes Nisihara
Published: April 2021

ABSTRACT. Major depression can develop in individuals aged 60 years or older and is commonly associated with cognitive decline in this population, especially the domains of working memory, attention, executive functions, and processing speed. Schooling is a protective factor with regard to cognitive decline. Objective: To compare the cognitive performance of community-dwelling older adults with a low level of schooling with and without major depression. Methods: A descriptive, analytical, cross-sectional study was conducted with 22 community-dwelling older adults with depression and 187 without depression. The following assessment tools were employed: Mini Mental Health Examination, Brief Cognitive Screening Battery, Consortium to Establish a Registry for Alzheimer’s Disease (CERAD), Digit Span Test (forward and backward), and an object similarity test. Results: No statistically significant differences were found between the groups with and without depression on any of the tests. Conclusions: This study demonstrated that there are no differences in the cognitive performance of older people with and without depression on neurocognitive tests commonly used in clinical practice. Future studies with different designs and methods as well as specific tests for older people with a low level of schooling could assist in the understanding of these relations and the mechanisms involved.
Neuropsychiatric symptoms associated with family caregiver burden and depression
Authors: Delfino Lais Lopes , Komatsu Ricardo Shoiti , Komatsu Caroline , Neri Anita Liberalesso , Cachioni Meire
Published: April 2021

ABSTRACT Alzheimer's disease (AD) is a progressive and degenerative condition affecting several cognitive areas, with a decline in functional abilities and behavioral changes. Objective: To investigate the association between neuropsychiatric symptoms in older adults with AD and caregiver burden and depression. Methods: A total of 134 family caregivers of older people diagnosed with AD answered a questionnaire with sociodemographic data and questions concerning the care context, neuropsychiatric symptoms, caregiver burden, and depressive symptoms. Results: Results revealed that 95% of older adults had at least one neuropsychiatric symptom, with the most common being: apathy, anxiety, and depression. Among the 12 neuropsychiatric symptoms investigated, 10 were significantly associated with caregiver burden, while 8 showed significant correlations with depressive symptoms. Conclusions: Neuropsychiatric symptoms were related to caregiver burden and depressive symptoms. In addition to the older adult with AD, the caregiver should receive care and guidance from the health team to continue performing quality work.
Comparison of screening tests in the evaluation of cognitive status of patients with epilepsy
Authors: Souza Mayla Cristine de , Paulo Carolina Oliveira de , Miyashiro Larissa , Twardowschy Carlos Alexandre
Published: April 2021

ABSTRACT. Epilepsy, a chronic neurological condition which is associated with neurobiological and psychosocial changes, affects 0.5 to 1% of the world's population, presenting in most cases a deficit in reasoning, memory and attention. Objective: To contribute to the implementation of screening strategies for cognitive decline and memory deficits in patients with epilepsy. Methods: Two questionnaires, MMSE and MoCA, were used in this cross-sectional and observational study. Fifty-four patients diagnosed with different types of epilepsy (55% refractory) were assessed; they were all over 18 years old, of both genders, with autonomy to answer the questionnaire. They were followed exclusively at an outpatient clinic of the Neurology Service Department, specialized in epilepsy, which is part of the tertiary healthcare level of the Brazilian Unified Health System (SUS). Results: The final sample consisted of 54 patients. There was a significant correlation (p<0.001) between the scores of both tests, indicating that low values in the MMSE score also corresponded to low values in the MoCA score. Sensitivity was 90% (ROC curve adjusted) and 87.5% of the patients with a normal score in the MMSE test obtained alterations in the MoCA scores. None of them showed a low MMSE score with a normal MOCA score. The Spearman correlation coefficient was 0.80. Also, there was a significant relationship between both immediate memory and delayed recall memory and the type of seizure (p<0.03) and level of schooling (p<0.001), respectively. Conclusion: The MoCA is a well-suited test to be performed in epilepsy patients to evaluate their cognition as it seems more extensive and complete compared to MMSE.
Continuous flow process to make fermented cassava starch substitute: I. Physicochemical and functional properties
Authors: Brito Vitor , Santos Renata , Narcisa-Oliveira Jeniffer , Demiate Ivo , Cereda Marney
Published: April 2021

Abstract The Brazilian fermented cassava starch (polvilho azedo) is prized as a raw material for fast food preparation. Its traditional production by natural fermentation and exposure to sunlight favors contamination and impurities, in addition to depending on the climate. The literature explains the characteristic expansion of polvilho azedo as a reaction of the lactic acid produced during fermentation and sun radiation. With the aim to evaluate a commercial continuous flow process, a modular lamp (UV-C) was evaluated to substitute exposure to sunlight. The selected doses were 1,000, 5,000 and 10,000 Joules per liter (J l-1). Native cassava starch suspension in water at 6% (dry basis) was adjusted to 4% lactic acid (dry basis) and exposed to UV-C radiation: (a) without lactic acid, (b) with lactic acid reaction for 1 hour, (c) with ultraviolet radiation, in addition to the combination of (ac) and (bc). The results showed that only the combination of acidification and ultraviolet radiation (bc) allows an expansion (11 cm3 g-1) higher than the commercial polvilho azedo (8.24 cm3 g-1) adopted as standard. It was concluded that is possible to achieve a substitute for fermented cassava starch by acidification of native cassava starch with lactic acid in a continuous flow system starting with a dose around 5,000 J l-1 of UV-C radiation.
Interações midiatizadas: aproximações entre midiatização e regimes de interação e sentido
Authors: Mattos Maria Ângela , Mendes Conrado Moreira , Salgado Tiago Barcelos Pereira
Published: April 2021

Resumo O artigo articula midiatização e interação ao aproximar e tensionar as perspectivas teóricas acerca da midiatização e os regimes de interação e sentido propostos pela sociossemiótica. Assim, considera que a articulação das perspectivas norte-europeias e latino-americanas de midiatização, com os quatro regimes de interação e sentido — programação, manipulação, ajustamento e acidente —, apresenta potencial heurístico para analisar interações midiatizadas. A análise dessas interações se volta para alguns elementos da campanha eleitoral de Jair Bolsonaro à presidência em 2018, destacando as fake news operadas por bots e o episódio da facada ao então candidato. O trabalho conclui, com base nesse caso, que programação, manipulação e acidente tendem a se relacionar com a perspectiva institucionalista da midiatização, centrada na lógica da mídia. Manipulação, ajustamento e acidente tendem a se relacionar com a perspectiva socioconstrutivista, inscrita nas lógicas da midiatização.
A tensão como potência para teorizar a comunicação
Authors: Rosário Nísia Martins do
Published: April 2021

Resumo Este artigo tem como propósito realizar uma abordagem da comunicação pela perspectiva da Semiótica da Cultura, trazendo reflexões de Iuri Lotman que contribuem para a problematização de paradigmas já assimilados pela área, expandindo o modo de entendê-la e de compor seus princípios. Com Lotman, por meio de conceitos como os de tensão, função criativa do texto, ruído e explosão, pode-se vislumbrar o potencial comunicativo dos processos que geram indeterminação de sentidos e estimulam a formação de novas tramas de tradutibilidade que vão constituir acréscimo de significados e até mesmo alterar a linguagem e os códigos — uma outra ótica para a comunicação.
Mediality: the cultural-symbolic sphere of social practice
Authors: Bauer Thomas A.
Published: April 2021

Abstract At least since the practical complexity of media landscapes is growing, the theoretical complexity of media communication has to be widened (horizon and frame) and deepened (focus) — especially when fulfilling the mission and the quality of science: generating complexity on a level of logical theory towards a subject that is not an object by itself but a culturally programmed metaphor of description: communication, culture, society etc. The complexity of communication, media or society is not a character of those constructs themselves but a complexity of thinking, in practice hopefully reduced, in theory hopefully produced. Facing communication (more) as a cultural performance of humanness and of social practice and facing media (more hermeneutically than technically) demands to conceptualize those constructs as models of knowledge, as culturally programs in search of mindful meaning and meaningful relevance of social /societal life. Therefore, there is need of a shifting paradigm from functional, objectivist concepts to hermeneutically open concepts — not only, but also to generate a wider frame of analysis and interpretation of social and cultural change referred through the mediality character of communication and society. So called social media are not new media but show the possibility as well the challenge and chance of change of media orders. Of course, that demands other (new) competence concepts of social practice.
Donor-derived TB after kidney transplantation: a case report
Authors: Ulisses Luiz Roberto de Sousa , Cardoso Helen Souto Siqueira , Alves Inara Creão Costa , Medeiros Isabela Novais , Oliveira Camilla Garcia de , Almeida Tiago Martins de , Castro Fabíola Fernandes dos Santos , Silva Claudia Neto Gonçalves Neves da , Lima Laura Viana de , Fontoura Renata Pereira , Silva Eduardo Resende Sousa e , Araújo Pollyana Lopes de , Ferreira Gustavo de Sousa Arantes
Published: April 2021

Abstract Introduction: Tuberculosis (TB) is a possible serious complication of solid organ transplantation, associated with high mortality and morbidity. Post-transplant TB has varied pathogenesis with many approaches to its prevention, which is the most important way to reduce its incidence. Treatment of TB in organ recipients is challenging because of drug toxicity and interaction with immunosuppressants. Case report: an 18-year-old woman that underwent kidney transplantation from a deceased donor and was discharged with fair renal function was readmitted at 37th postoperative day with fever. CT showed signs of miliary TB and fluid collection besides graft fistulization through the skin. The patient presented positive BAAR in the drained fluid and Koch's bacillus in the urine. She was treated with a four-drug regimen (rifampicin, isoniazid, pyrazinamide, and etambutol), with great response and preserved graft function. We were informed that the recipient of the contralateral kidney also presented post-transplant TB, implying in a donor-derived origin. Conclusion: TB is an important differential diagnosis for infectious complications in patients after solid-organ transplantation, especially in endemic regions. Its initial clinical presentation can be unspecific and it should be suspected in the presence of fever or formation of fluid collections. The suspicion of TB is the key to early diagnosis and satisfactory outcomes in post-transplant TB.
COVID-19 and chronic kidney disease: a comprehensive review
Authors: Pecly Inah Maria D. , Azevedo Rafael B. , Muxfeldt Elizabeth S. , Botelho Bruna G. , Albuquerque Gabriela G. , Diniz Pedro Henrique P. , Silva Rodrigo , Rodrigues Cibele I. S.
Published: April 2021

Abstract Kidney impairment in hospitalized patients with SARS-CoV-2 infection is associated with increased in-hospital mortality and worse clinical evolution, raising concerns towards patients with chronic kidney disease (CKD). From a pathophysiological perspective, COVID-19 is characterized by an overproduction of inflammatory cytokines (IL-6, TNF-alpha), causing systemic inflammation and hypercoagulability, and multiple organ dysfunction syndrome. Emerging data postulate that CKD under conservative treatment or renal replacement therapy (RRT) is an important risk factor for disease severity and higher in-hospital mortality amongst patients with COVID-19. Regarding RAAS blockers therapy during the pandemic, the initial assumption of a potential increase and deleterious impact in infectivity, disease severity, and mortality was not evidenced in medical literature. Moreover, the challenge of implementing social distancing in patients requiring dialysis during the pandemic prompted national and international societies to publish recommendations regarding the adoption of safety measures to reduce transmission risk and optimize dialysis treatment during the COVID-19 pandemic. Current data convey that kidney transplant recipients are more vulnerable to more severe infection. Thus, we provide a comprehensive review of the clinical outcomes and prognosis of patients with CKD under conservative treatment and dialysis, and kidney transplant recipients and COVID-19 infection.
The intellectual foundation of the elite of Brazilian researchers on knowledge organization domain
Authors: ARAÚJO Paula Carina de , BUFREM Leilah Santiago
Published: April 2021

Abstract This study aims to analyze the intellectual foundation of the literature on knowledge organization published from 1972 to 2018 by authors enrolled in the Research Productivity Fellowship from Conselho Nacional de Desenvolvimento Científico e Tecnológico, in Brazil. The corpus of analysis is composed of 166 papers indexed in Base de Dados Referencial de Artigos de Periódicos em Ciência da Informação, which is a database that gathers the scientific literature published in Information Science journals in Brazil. It is an exploratory study that uses citation analysis as the methodological procedure, through author co-citation analysis and author bibliographic coupling. Fujita is identified as the most productive author, with 18 articles. Dahlberg is the most cited author, with 53 citations. The highest frequency of author co-citation is between Hjørland and Dahlberg; Tálamo and Kobashi. They are the seminal authors to the Brazilian scientists studied in this paper. The strongest relationships in the author bibliographic coupling network are between Lara and Bufrem, Lara and Guimarães, and Bufrem and Fujita. They cited 9 authors in common in the papers analyzed in this research. The conclusion is that there is an influence of European literature among the scientists addressed in this study. The results indicate the possibility of developing diachronic studies on the continuing influences of cited authors, especially from seminal authors, to analyze their permanence or transience over time.
Technological parameters determining the sintering process intensity
Authors: Savel’ev S. G. , Kondratenko M. N.
Published: April 2021

The sintering intensity is an important factor determining techno-economic efficiency of sinter production which provides the blast-furnace process with the main type of agglomerated iron ore raw materials. The charge sintering rate depends on technological parameters of the sintering process. Therefore, a systematic study of sintering technological parameters, which determine its intensity, is of practical and scientific interest. Indicators of the sintering process intensity are considered that assess it from both the mechanical and heat engineering positions. It is shown that in its purest form the sintering process intensity is characterized by the vertical agglomeration rate and combustion intensity of the sintering charge carbon. Two other indexes − the specific productivity for suitable sinter and intensity of heat output in the combustion zone – are less representative for the comparative estimation of sintering intensity, since their values depend on sintered mass strength and thermal effect of carbon combustion respectively. These factors go beyond the essence of the sintering intensity concept. Since content of fines of 5 – 0 mm at different sinter plants is not equal, representative performance comparison of sintering process is possible only taking into account the total amount of fines generated throughout the agglomerate transport path from sinter machine to blast furnace or the results of testing the agglomerate strength in a drum. A comprehensive systematic classification of techniques has been developed to intensify the sintering process based on the material-component principle using four levels of separation – objects, directions, paths and methods in which each subsequent level concretizes and develops the previous one. Its value is universality, which makes it possible to apply a systematization and separation system for almost all already known and future methods of sintering process intensification.
EBSD analysis of graphitized steel microstructure after compression deformation at room temperature
Authors: Zhang Y.
Published: April 2021

The graphitized steel has attracted considerable attention due to its excellent cutability and good properties at cold forming. Compression deformation at room temperature of graphitized steel (0.43 % C) with a ferrite-graphite microstructure was performed on a universal testing machine. Microstructures of deformed samples were studied using the analysis technique of Electron Back-Scattered Diffraction (EBSD). The evolution of microstructure morphology, texture, distribution of Kernel Average Misorintations (KAM) and the Taylor factor in the zone of large deformations of deformed samples with different degrees of deformation is discussed. The results show that the studied steel has a good ability to compression deformation. During compression deformation, with an increase in deformation degree the deformation morphology of the ferrite grain and graphite inclusions gradually stretch in the direction perpendicular to the compression axis and they are represented as fibrous forms. The orientation of ferrite grains in the matrix is gradually obvious, and the orientation of ferrite grains around graphite inclusions is not obvious, that is, the number of grains oriented to <100>, <111> in the matrix is much greater than around graphite inclusion. In addition, KAM and the Taylor factor in the large deformations region of compression samples show that the deformation degree of ferrite grains around graphite inclusions is less than that of ferrite grains in the matrix. The reason for this is that the soft graphite inclusions can reduce the degree of dislocation pile-up.
Diversifi cation model of a holding company’s activity (in case of the Rosatom State Corporation)
Authors: Faikov D. Yu. , Baidarov D. Yu.
Published: April 2021

The empirical research conducted by the authors revealed a number of models for diversifying defense enterprises in Russia. The model characteristic for Rosatom State Corporation has been examined in a precise detail. The main parts of the model include strategy, product, technologies, technology transfer, structural organization, marketing, financing, state regulation. The parts consist of a number of elements configured in various ways depending on the tasks to be done, external conditions, resources, etc. The model takes into consideration three basic targets: raising sustainability of a large holding company’s activity; diversifying activities of the defense enterprises that are part of the state company; performing government functions such as developing high-technology industries, exploring areas of presence, shaping public policy in these directions. The model involves exploiting technologies developed by the enterprises of the state corporation, by traditional defense partners, by external non-defense partners including foreign ones. These technologies provide the basis for creating new civil products with market novelty, high technology, perspective, profitability, and also there must be a possibility to manufacture these products at the enterprises of the state corporation. The peculiar features of the model include arranging diversification at three levels – the corporation level, the division level and the enterprise level; using an integrator – a company which unites and coordinates activities of different enterprises in a certain direction, provides marketing, attracts external partners, deal with customers, etc. Development of the model involves development of innovative facilities in the areas of presence, more active cooperation with non-defense organizations, developing forms of transfer of technologies.
Methodological approach to maintaining executive offi cers’ competitiveness at the coal mining enterprises
Authors: Zakharov S. I.
Published: April 2021

The topic of the article is of great current interest due to increasing inconsistency between the real results of executive offi cers’ activity and the results required for maintaining the path of sustainable economic development of coal mining enterprises in Russia. The author suggests methodological approach to maintaining executive offi cers’ competitiveness at the coal mining enterprises; defi ne such notions as an executive offi cer and executive offi cers’ competitiveness, and revealed some major characteristics of social and economic results of executive offi cers’ work. The article presents the approach to estimating competitiveness which makes it possible to determine the competitive positions of executive offi cers and take urgent action to improve them. The authors introduce an enlarged scheme of maintaining competitive position of an executive officer based on the development of his managerial potential and competitive environment at the coal mining enterprises. They present methodological tools for estimating managerial potential and competitive environment of a company. In conclusion the author points out the priority of transformation of labour relations and institutes to improve competitive positions of the executive officers of coal mining enterprises.
Development and methods of mining management and metallurgical industry in the Republic of Tajikistan
Authors: Kamalitdinov T. S.
Published: April 2021

The author analyzes the foundation of mining and metallurgical industry of Tajikistan using the available historical publications and predictive research of scientists of the Republic of Tajikistan and Russia, as well as mass media sources. The main purpose is to show the availability of mineral resources, historical and contemporary demand, condition and prospects for their development. It is noted that Tajikistan mining and geological surveys conducted by world scientific researchers revealed numerous remains of the Bronze Age settlements in the North and South of Tajikistan. The remains prove that alongside cattle breeding and farming the Persian and the Tajik people of that time were also engaged in mining, metal mining and pottery. The author adduces arguments for organizing international expedition to discover historical areas of formation of metallurgical production. The findings of the expedition include extremely interesting millennia-old achievements in development of job safety system and metal production in different territories. The results of the research were used to distinguish the characteristic features of the areas, their potential opportunities for further development of metallurgical industry in Middle Asia and especially in the Republic of Tajikistan. The development of mining and metallurgical industry in Tajikistan is of high expediency due to availability of mineral resources and cheap labour force. The measures taken on its sustainable supply of electric power and fuel resources are of special interest. The author points out that functioning of mining and metallurgical enterprises with the Tajik Aluminum Company (TALCO) being the most significant of them resulted in creating a number of highly skilled jobs and building industrial facilities in the central region of the Republic. Analysis of the state of placement of hydropower resources in Middle Asia allows setting the priorities for development of this process in the Republic of Tajikistan. The author outlines major managerial problems of metallurgical industry in the Republic of Tajikistan and highlights the important peculiar features of management of mining enterprises under market conditions. For example, the transition to new institutional management methods due to implementing the tolling method of management provided the TALCO with the opportunity to escape bankruptcy and preserve the company.
Evaluating effi ciency of exploiting business capital of corporate enterprises of coal and mineral industry in Vietnam
Authors: Duyen Vu Thi , Larionova I. A.
Published: April 2021

Evaluation of effi ciency of exploiting capital is an important part of a company’s economic activity. A reasonably formed system for monitoring effi ciency of exploiting the capital will provide the company with appropriate basis for managerial decision-making such as adjustment of scale and structure of investment and choice of sources of capital. When considering measures aimed at eliminating negative phenomena influencing the efficiency of exploiting business capital it is essential to use a complex of various analysis patterns to make perfect managerial decisions. The authors examine a complex of individual indicators which to their mind are essential to be used in analyzing efficiency of exploiting business capital in coal and mineral industry of Vietnam. The calculations revealed that a number of individual indicators which characterize efficiency of exploiting business capital for particular enterprises within the corporation of coal and mineral industry of Vietnam were significantly different from the average and showed considerable fluctuation. Therefore, development of measures to eliminate negative phenomena influencing the efficiency of exploiting business capital should include calculating both individual indicators and a generalized indicator (the evaluation vector) which could be used to study the character of their fluctuation as well as the values of the parameters under consideration.
Prospects for using data from pending orders for forecasting oil prices in Russia
Authors: Paleev D. V. , Chernyaev M. V. , Solovyova Yu. V.
Published: April 2021

Modern oil-pricing is more dependent on the stock market conditions than on the cost price or demand and supply laws. The price is infl uenced by a great number of objective and subjective factors. The ability to analyze these factors is the basis of the modern stock market trade. Thus, stock quotes are the key to analyzing oil market in the short-term perspective. The authors study current trends informing pricing factors of the oil market and their influence. They point out the peculiarities of using orders as pricing tools, adduce Russian experience on pending orders at the oil market, analyze the specificity and prospects of using pending orders for analyzing oil market. So, changes of the conditions can be predicted much faster than by using traditional statistic methods of analyzing transactions. The authors conclude that using such a tool as a pending order will lead to better understanding of the market conditions for the main Russian oil brand (Urals). It will make the market more predictable and controllable by the government which will mitigate the consequences of drastic changes in oil prices and the changes of the cost of energy and fuel arising from that making the economy more resistant to crises. More accurate forecasts will increase the Russian traders’ income from the transactions. The authors use international researches devoted to stock market trade and data analysis, and information from software developers who design programs for analyzing stock market data.
Strategic management of competitiveness in regional spatial and sectoral structures under modern conditions
Authors: Misharin Yu. V.
Published: April 2021

The article summarizes the results of the research conducted and theoretical and methodological approaches in strategizing and strategic management with considering the development principles. The author introduces the model of strategic management of spatial development based on the chaos theory of infl ation in the economic environment. The article also defi nes the notion of “structurizing” as a sort of strategic management. The design of economic structures is considered as the implementation mechanism for the strategy developed according to the balanced scorecard (BSC) methodology. The article reveals the specific features of maintaining the competitiveness of a regional spatial and sectoral structure from the viewpoint of sustainable development concept. The author suggests the SEEIT-method of analysis and synthesis to evaluate the competitiveness level from the spatial and sectoral perspective (analysis) and create competitive advantages of regional spatial and sectoral structure (synthesis). The author’s definition of sustainable development provides the basis for formulating a concept of transient competitive advantage which meets the modern conditions of competition.
Development scenarios of new world order and transition to carbon-neutral waste-free economics-2050
Authors: Shipkova O. T. , Vdovenko Z. V.
Published: April 2021

The authors analyze the patterns of strategic transformations in developed and developing countries by 2050. They paid special attention to basic global present-day trends and forecasting the changes in chemical industry. The article examines the predictive model of strategic solutions of the European Union based on strategic long-term vision of the modern competitive economy’s prosperity. The authors present the analysis of scenarios of transition to waste-free and effective technologies suggested by Europe. They take into consideration scientifi c and technological development and determine major reference points for development of chemical industry in Russia by means of examination of the developed models, scenarios, strategies, programs of transformation in different countries of the world and transition to carbon-neutral waste-free economics. The authors consider predictive scenarios of development of Russia’s chemical industry.
Overview of NCBI's submission process and the metadata required v2
Authors: Timme Ruth , Griffiths Emma , Katz Lee
Published: April 2021

PURPOSE: This protocol explains the metadata requirements for the following two protocols: Complete in order (1 then 2): 1. SARS-CoV-2 NCBI submission protocol: SRA, BioSample, and BioProject Step-by-step instructions for establishing a new NCBI laboratory submission account and for creating and linking a new BioProject to an existing umbrella effort. SARS-CoV-2 raw data submission to SRA (Sequence Read Archive) and metadata to BioSample. 2. SARS-CoV-2 NCBI consensus submission protocol: GenBank Required: established BioProject and BioSamples Submit SARS-CoV-2 assemblies to NCBI GenBank, linking to existing BioProject, BioSamples, and raw data.
[RETRACTED] Introduction to Thai Ha clinic v1
Authors: Ha Clinic Thai
Published: April 2021

[RETRACTED]

Thai Ha Clinic
Adjustment of parameters of precision stamping of gear wheels on results of modeling of physical processes at their chemical and thermal processing
Authors: Shibakov V. G. , Pankratov D. L. , Shibakov R. V. , Nizamov R. S.
Published: April 2021

The surface layer after chemical-thermal treatment in structure and physico-mechanical properties differs sharply from the inner layers of the product, which leads to significant internal stresses that cause deformation and warping, i.e. resizing and shape. Prediction of the phase composition, depth of carbon saturation of the layer, microhardness and deformation of the surface of the product elements after chemical-thermal treatment based on modeling in the application package allows even at the stage of technological preparation for the production of precision hot die forging to make adjustments to the geometry of the die tool to increase dimensional accuracy, and accordingly, the durability of the gear ring gears. The input data for modeling the processes of chemical-thermal treatment is a 3D model of the product with a finite element grid and the fixation scheme of the product, temperature and time modes (heating temperature, heating and cooling rate, holding time, number of cycles), type of carburizing cooling medium and its temperature, material details.