bluuebunny/crossref_metadata_2025 huggingface dataset:
A study on fine needle aspiration cytology of thyroid lesions with correlation to histopathological examination with special reference to Bethesda system of reporting at a tertiary care centre
Authors: Lahkar Nandinee , Deka Manoj Kumar , Khakhlari Nitu Mani
Published: December 2019

Background: Annual incidence of thyroid nodules ranges from 40,000 to 70,000 per 1 lac population worldwide. Fine Needle Aspiration (FNA) of the thyroid is widely accepted simple, cost effective and quick to perform outpatient procedure with minimal complication. The National Cancer Institute (NCI) Bethesda, Maryland, United States standardized the reporting system for thyroid FNA by using Bethesda system for reporting thyroid cytopathology.Methods: FNA was performed in total 155 patients presenting with the thyroid swelling with or without Ultrasonography (USG) guidance. All patients were analyzed for age, gender, type of lesions. FNA was done and smears were examined and reported according to Bethesda system of reporting for thyroid cytopathology. Findings were correlated with post-operative histopathological diagnoses in 103 cases who underwent surgery.Results: Out of total 155 patients, 32 were male and 123 were female. Average age of presentation was 38.4 years. On cytology, according to Bethesda system, most cases were in benign category (76.1%) followed by malignant (8.4%). On histopathological study most common diagnosis was colloid goiter followed by papillary thyroid carcinoma. From the study it was found that sensitivity, specificity and accuracy of fine needle aspiration cytology of thyroid lesions were 81.8%, 97.3% and 95.4% respectively.Conclusions: Fine needle aspiration cytology is simple, easy to perform, cost effective procedure with high sensitivity, specificity and diagnostic accuracy in case of thyroid lesions.
Psychopathology in patients with psoriasis: a cross-sectional clinical study
Authors: Padma Kumari , Nanaware Sagar Subhash , Yadihal Aruna , Mathai P. John
Published: December 2019

Background: Psoriasis is associated with a variety of psychological problems including poor self-esteem, sexual dysfunction, anxiety and depressive disorder and suicidal ideation. There are reports that patients with psoriasis may have significant psychiatric morbidity. The objective of the study is to evaluate the frequency of psychiatric disorders, frequency and nature of psychiatric symptoms in patients with psoriasis.Methods: 100 patients with psoriasis were evaluated and included for the study. Comprehensive Psychopathological Rating Scale (CPRS) is used for assessment of psychiatric symptoms and MINI Plus for assessing psychiatric disorders. Chi-square test was used to compare the proportions.Results: Patients with psoriasis had high frequency of psychiatric morbidity and was found to be 42%.Conclusions: Patients with psoriasis have more psychopathology and higher psychiatric morbidity which may further imply justifiable consultation liaison psychiatry in other speciality fields like Dermatology.
Blunt abdominal trauma: the experience in rural India and review of literature
Authors: Ahmed Mohd Hamid Shafique , Tamgadge Lalit Vishwanath , Gurav Prakash D. , Dalavi Santosh B. , Bankar Sanket , Parmar Ritesh
Published: December 2019

Background: Blunt Abdominal trauma is one of the most common injuries caused due to road traffic accidents. The rapid increase in number of motor vehicles and its aftermath has caused rapid increase in number of victims due to blunt abdominal trauma. As the care of patients with blunt abdominal injuries is largely a surgical responsibility and abdominal injuries involving major hemorrhage from solid viscera constitute surgical emergencies. Abdominal blunt traumas represent a real diagnostic and therapeutic challenge to even a most experienced surgeon, thereby representing importance of its study. Early diagnosis and effective management help in decreasing mortality in blunt abdominal trauma.Methods: Prospective study of 50 patients admitted to the institute with history of Blunt Abdominal Trauma. After initial resuscitation of the patients, thorough assessments for injuries were carried out in all the patients. Documentation of patients, which included identification, history, clinical findings, diagnostic test, operative findings, operative procedures and complications during the stay in the hospital were all recorded on a Performa specially prepared. The management was decided depending upon history, clinical examination and investigations.Results: Males were predominantly affected, and most cases were between the age group of 21-40 years (76%). Majority of the patients (90%) presented with the complaint of abdominal pain followed by abdominal distension (56%). 36(60%) patients were managed conservatively while operative interventions were required in 24(40%) patients. The common surgeries performed in the patients included splenectomy, primary closure of perforation and resection and anastomosis of bowel. Majority of the patients (80%) were discharged within 20 days of admission. The mortality in present study was 13.3%.Conclusions: Blunt Abdominal Trauma is one of the important causes of morbidity and mortality in young adults. Immediate resuscitative measures, management of associated injuries and appropriate operative intervention are important parts of management of such cases.
Bilateral idiopathic granulomatous mastitis a rare benign inflammatory disease of breast: case report
Authors: Hussain Talib , Bhardwaj Subash
Published: December 2019

Idiopathic Granulomatous Mastitis (IGM) is an uncommon benign inflammatory disorder of breast. Peri-ductal mastitis is thought to be the initial inflicting factor for its development. IGM usually presents as painful swelling, abscess or sinus/fistula in breast. There are no specific findings on ultrasound or mammographic imaging, and moreover it looks BIRADS-IV on mammography. Histopathology provides the final diagnosis. Here authors report a case of bilateral IGM which was successfully treated with surgery.
The impact of smart phones and mobile devices on human health and life
Authors: Mushroor Sumaiya , Haque Shammin , Amir Riyadh A.
Published: December 2019

Background: Overuse of smart devices provides comfort and problems both physically and mentally. The aim of this study was to assess the impact of smart phone and mobile devices on human health and life.Methods: This descriptive type of cross sectional study was conducted for three months in Dhaka city among general population aged 18 to 70 years. Four hundred and forty respondents were selected by non-probability convenient sampling technique. Data were collected by face to face interview with a semi-structured pre-tested questionnaire.Results: Among 440 respondents majority (76.6%) were below 25 years where 72.0% were students. A large proportion (90.5%) used smart phones for communication, 53.4% used for less than 5 hours daily. Majority (65.7%) had other electronic devices, most common 197 (68.1%) were laptop users where 118 (40.8%) used for studying. More than half 322 (73.2%) used earphones, 91 (20.7%) had ear problems and 223 (50.7%) lacked concentration. Many 299 (68.0%) had good relationship with family members, 208 (47.3%) stated that increased use of mobile devices hampered family life, 88 (42.3%) thought it reduced quality family time. Majority users 253 (57.5%) experienced physical discomfort after prolonged use and 95 (37.7%) suffered from headache. Association between age of respondents and time spent on smart devices was statistically significant (p<0.05). There was significant (p<0.05) association between ear problem and ear phone usage.Conclusions: Excessive use of smart phones should be avoided and social awareness increased through health programmes. Potential risks of cell phones and smart devices can be avoided by limiting the use.
The effect of alternate nostril breathing exercise in vital signs of congestive heart failure patients
Authors: Simandalahi Tiurmaida , Morika Honesty Diana , Fannya Puteri
Published: December 2019

Background: Changes in vital signs such as tachycardia, dyspnea, tachipnea, decreased oxygenation, caused by the inability of the heart to pump enough blood to meet the needs of oxygen and nutrients needed by the tissue, so that alternative therapies are needed: alternate nostril breathing exercise (ANBE) as a companion to pharmacological therapy for congestive heart failure (CHF) patients. The purpose of this study was to see the effect of ANBE on the vital sign of CHF patients.Methods: This Quasy experimental study was used one group pretest and Posttes design, conducted at one of the Padang City Hospitals from March to August 2019. Study population includes CHF sufferers, with a sample of 16 people, using accidental sampling technique. Univariate data analysis to get the mean of vital sign and bivariate measurements using parametric test i.e. Paired t-test to see the effect of this therapy.Results: Mean vital signs pretest and posttest was given in a row The observations are: respiratory rate (RR): 5.4978; 4.6078, pulse: 10.1804; 8,7770, systolic blood pressure (SBP): 12,5963; 11,1481, and diastolic blood pressure (DBP): 10,3009; 8.8606. Paired t-test obtained p-value of RR, pulse, SBP and DBP: 0.000, and existing t count> from t table (t count> 2.13145), so that there is an effect of ANBE on vital signs.Conclusions: ANBE affects the vital sign of CHF patients and can be continued as an intervention that can be carried out independently by CHF sufferers.
Sleep quality among medical students in Moradabad, Uttar Pradesh, India
Authors: Goyal Neha , Gupta Sudhir Kumar
Published: December 2019

Background: Good quality sleep is necessary for overall health. Especially medical students are more prone to have sleep difficulties and with this context present study was done to assess the sleep quality among medical undergraduate students.Methods: This cross-sectional study was conducted among undergraduate students of a medical college in Moradabad, during April to May 2019. Assessment of sleep quality was done by means of self-administered questionnaire based on sleep quality scale. Data was analysed with help of SPSSv21 and statistical tests used were Welch t-test, Chi square test and logistic regression analysis.Results: Mean age of all 149 students was 20.99±0.91 years and mean sleep quality score of all students was 37.90±9.73. Overall 29.53% students had poor sleep quality scores. 8.7% students always have difficulty in falling asleep and 32.9% students were rarely satisfied with their sleep. Poor sleep quality has not been found to be significantly associated with age, gender, BMI and level of physical activity.Conclusions: Sleep quality vary considerably among medical students and approximately one third of medical students had poor sleep quality. Sleep quality scale used has been found reliable.
Knowledge, attitude and practice study on awareness and preventing cyber threats among the electronic devices used by the doctors of government medical college Vellore, Tamil Nadu, India
Authors: J. Balaji , G. Ganesh
Published: December 2019

Background: Now a days the whole World is submerged with digital electronics devices round the clock for all utilities. Even the doctor community also is not spared by these digital gadgets. Almost every doctor in India is permanently having and operating a smart phone and laptops or desktops plus vide computer applications.Methods: This cross-sectional study was conducted among 45 doctors across 7 departments of Government Medical College, Vellore. Mean, median, mode, standard deviation was used for quantitative data and Pearson chi square test and logistic regression was used for qualitative data using trial version of SPSS 22.Results: The mean score was 11.2±2.8 with mean scoring percentile of 38.8±6.5. There was Pearsons Chi square significance for Variables like exposure to external resources and, Books related to cyber security, age less than 34 years and average spending time with electronic devices >2.5 hours per day, designation MD versus MBBS, gender difference.Conclusions: On running logistic regression the multivariate analysis for study variables with statistical significance was seen for four variables- exposure to external resources, and books related to cyber security, age <34 years, average spending time with electronic devices >2.5 hours per day. Designation and gender variables lost their significance on logistic regression analysis.
Análise comparativa do desempenho elétrico de isoladores tipo pino sob diferentes condições de poluição
Authors: Dias Bruno Albuquerque , Costa Edson Guedes , Diniz Larissa , Leite Neto Antonio Francisco , Rocha João Marcos Leal , Moreno Victor Gomes
Published: December 2019

This paper analyzes the performance of insulators subjected to pollution levels related to two topologies of 15 kV voltage class polymeric distribution isolators. A software was used to simulate the influence of various levels of pollution on the operation of insulators. Pollution layers with the variation of conductivity and permittivity parameters were modeled on the surface of the insulators and the electric potential, the electric field and the current density in the polymeric isolators were obtained by computer simulation. The results showed the increase of the electric potential distribution, the electric field and the current density of the insulators as the pollution intensity increases. The results proved that the topology with four sheds performs better in polluted conditions. Thus, it can be concluded that in long distribution lines different insulator topologies can be used, according to the region and microclimate that the insulators are exposed.
A legalização da dualidade no ensino técnico brasileiro: um estado do conhecimento sobre o Decreto nº 2.208/1997
Authors: Lima Ana Paula Marinho de , Souza Francisco das Chagas Silva , Oliveira Leonor de Araújo Bezerra de
Published: December 2019

The decade of 1990 was the scene ofsignificant transformations in the economic, social and educational realms. Regarding education, especially Vocational and Technological Education, the Decree number 2,208/1997, signed by the former President Fernando Henrique Cardoso took effect in the scope of Vocational and Technological Education Reform. As the main consequence of this Decree, we have mentioned the separation between Technical Education and Secondary Education, a fact that lasted until its revocation by Decree 5,154/2004, signed by President Luiz Inácio Lula da Silva. In this article, we carried out a survey of the academic publications regarding the Decree number 2,208 / 1997 based on the Catalog of Thesis and Dissertations of CAPES. The research was based on 14 projects, being 12 dissertations and 2 theses. The studies analyzed focused on the impacts brought by the Decree number2,208/1997, which were understood by the authors as a setback for vocational and technological education, since it consolidated the duality existing between education and general training.
Análise de revestimento dielétrico de um sensor UHF de microfita aplicado na detecção de descargas parciais em transformadores de potência
Authors: Aquino Marcus Vinícius Dantas de , Serres Alex Jean René , Costa Edson Guedes da , Xavier George Victor Rocha , Nobrega Luiz Augusto Medeiros Martins , Souza Vladimir Cesarino de
Published: December 2019

The use of UHF sensors in high voltage electrical equipment for monitoring its insulation system is widely used. In order to improve these sensors,we present an analysis of different types of dielectric materials that can be used as physical coating and shield, which can enhance the electromagnetic characteristics of UHF microstrip sensors applied to the detection of partial discharges in performance transformers. The materials used as coating were glass, silicone, FR4, Teflon, and acrylic. In order to do so,, HFSS software simulations for the development of analyzes on two UHF microstrip antennas were performed. From the analyzes performed, it was verified the improvement of the reflection coefficient and the gain of the UHF sensor recorded the materials used to demonstrate the practical application. In addition to that, we also had simulations of a typical electromagnetic shield applied in conjunction with the sensor to demonstrate that the shield is still displayed in the design stages and is of great relevance. In order to underpin the data obtained from the simulations, the real models of UHF sensors were applied and tested in the laboratory.
Educação Física e Música: possibilidades de integração
Authors: Carneiro Italan
Published: December 2019

The purpose of this work is to present reflections upon the integration possibilities between Physical Education and Music, both subjects which are part of the school curriculum. Based on bibliographical research, possibilities were identified in the intersectional areas. Among these, here are highlighted those which approach the “rhythmic aspect” of body and musical movement. We started from the notion that the consciousness development of the corporal aspects related to the movement is a fundamental question for the individuals’ integral development. Thus, we highlight the benefits of the integration between the areas, also emphasizing the importance of both disciplines in the school curriculum.
El sujeto de los riesgos en un mundo transhumano y posclínico: reflexiones a partir de Todos los nombres de Saramago y de Matrix de las hermanas Wachowski
Authors: Almeida-Filho Naomar
Published: December 2019

La premisa principal de este texto es que el discurso social común, expresado en las artes y las humanidades, ha sido crucial para el proceso de construcción de lenguajes y cosmologías tecnocientíficas. Se examinaron los fundamentos y las correlaciones de este argumento tomando como referencia disciplinas científicas establecidas de manera reciente, como la epidemiología, con la ayuda de dos obras de arte: la novela Todos los nombres, escrita por Saramago, y la trilogía cinematográfica Matrix, escrita y dirigida por las hermanas Wachowski. Ambas alegorías son ilustrativas del mundo virtual posibilitado por la tecnociencia. La propuesta consiste, entonces, en establecer un paralelo entre los primeros observatorios sociales que encapsularon poblaciones enteras para su observación sistemática (lo que permitió el perfeccionamiento de la metodología epidemiológica) y el “sueño epidemiológico”, casi cumplido con la introducción del procesamiento electrónico de información y potenciado ahora por el avance de estrategias de modelado y simulación y por la organización de megabases de datos de salud, enfermedad, vida y muerte.
Investigation of Gold Electrosorption onto Gold and Carbon Electrodes using an Electrochemical Quartz Crystal Microbalance
Authors: Mansurov Z. , Supiyeva Zh. , Avchukir Kh. , Taurbekov A. , Yeleuov M. , Smagulova G. , Mansurova M. , Biisenbayev M. , Pavlenko V.
Published: December 2019

The adsorption behavior of Au3+ ions on metal electrodes has been studied using an electrochemical quartz crystal microbalance combined with the cyclic voltammetry technique. The experiments were carried out for HAuCl4 using 0.1 mol·L-1 HCl (pH~1) as a background electrolyte solution. The kinetics of electroreduction of Au3+ ions on the rice husk based activated carbon and gold electrodes in chloride electrolytes by the cyclic voltammetry and the electrochemical quartz crystal microbalance with a variation of the scan rate in the range of 5‒50 mV·s-1 has been studied. The diffusion coefficient of Au3+ ions for the tested solution on gold and carbon electrodes was determined by the cyclic voltammetry method on the basis of the Randles-Ševčik equation. It is found that electroreduction of gold goes via the discharge of AuCl4- complexes to the formation of metallic gold with a current efficiency of 97‒99%. The scanning electron microscopic images of the gold adsorbed carbon surface was taken to see gold particles and their morphology. In SEM images, it is clearly seen that the surface of carbon has a relief structure and gold has grown in the form of clusters. The smallest gold nanoparticles that could be examined were 100‒250 nm in diameter on the surface of the c arbon electrode.
Preparation of Carbon Nanotubes with Supported Metal Oxide Nanoparticles: Effect of Metal Precursor on Thermal Decomposition Behavior of the Materials
Authors: Matus E.V. , Khitsova L.M. , Efimova O.S. , Yashnik S.A. , Shikina N.V. , Ismagilov Z.R.
Published: December 2019

To develop new catalysts based on carbon nanomaterials with supported metal oxide nanoparticles for oxidative transformations of sulfur compounds, a series of metal oxide nanoparticle-decorated carbon nanotubes (MOx/CNTs) were prepared by incipient wetness impregnation at a variation of the active metal type (M = Ce, Mo, Cu). The thermal decomposition of bulk and CNT supported metal precursors used in the preparation of MOx/CNTs was analyzed under inert atmosphere employing several thermoanalytical techniques (thermogravimetry, differential thermogravimetry and differential scanning calorimetry) coupled with mass spectrometry. The thermolysis parameters of the bulk and supported metal precursors were compared and the effect of CNT support on the decomposition pattern of compounds was elucidated. It was established that the decomposition of metal precursors supported on CNTs was started and completed at temperatures of 15‒25 and 25‒70 °C lower, respectively, compared with the bulk active metal precursor. The enhancement of CNT support stability against thermal degradation is observed in the following row of metal cations: Ce < Cu < Мо < pristine and metal anions of precursor: nitrate < chloride < sulfate. The optimal mode of thermal treatment of catalyst and appropriate active metal precursors were selected for advanced synthesis of nanosized MOx/CNT catalyst.
Nanostructured Bitumen with Nanocarbon
Authors: Teltayev B.B. , Kalybai A.A. , Izmailova G.G. , Rossi S.R. , Amirbayev E.D. , Sivokhina E.S.
Published: December 2019

Physical and chemical indicators of bitumen quality of grade BND 70/100 with the added carbon nanopowder 2% by weight have been studied by laboratory test methods and analysis. High reaction ability of nanopowder particles and concentration of excess surface and internal energy in them have been determined, which provide the increase of low-temperature resistance, aggregate strength, and improvement of rheological properties of nanostructured bitumen. Essential structure variation has been proved: the increase of asphaltenes and oils content for 9% and 7.2% respectively due to the decrease of resins for 16.2% by weight. Methods have been discussed for preparing a liquid nanocarbon mix, adding of the mix into bitumen and homogenization of the bitumen. Some economic indicators have been represented which influence essentially the reduction for the cost value of the nanostructure bitumen.
Production Technology of Phytopreparations Based on Essential Oils
Authors: Shaimerdenova Zh.R.
Published: December 2019

The article provides an overview of phytopreparations technology based on essential oils, in particular: criteria for the selection of components, qualitative and quantitative compositions analyzes, parameters of the technological cycle of production of drugs, problems of standardization and quality control of stages of the production of original drugs. A number of standard samples based on terpenoids for phased quality control of the production of medicinal products are described, which are included in the European, Kazakhstan and Japanese pharmacopeias. The main countries producing essential oils and their components, as well as manufacturers of phytopreparations based on them are indicated. The modern technologies for the production of essential oils from plant materials are reviewed, namely: microwave and ultrasonic extractions, supercritical carbon dioxide extraction and micro-steam distillation with solid phase microextraction. The dosage forms of preparations based on essential oils (tablets, ointments, gels, oil solutions, suppositories, sprays, aerosols, nanocapsules), their relationship with bioavailability and therapeutic effect are discussed. Promising dosage forms that ensure dosage accuracy for the targeted action of drugs based on essential oils have been identified.
PSYCHOLOGICAL HEALTH OF PRESCHOOLERS IN THE CONTEXT OF PERSONAL SOVEREIGNTY OF PSYCHOLOGICAL HEALTH AND ATTACHMENT TO THE MOTHER
Authors: V. Levkova Tatyana , V. Shklyar Natalia , A. Borisova Elena , V. Karynbaeva Olga , E. Shapovalova Olga
Published: December 2019

Purpose of the study: To explore, both theoretically and empirically, the sovereignty of a preschooler's psychological space in the context of his/her psychological health. This paper reflects the idea that the psychological health of preschool children is a reflection of their qualitative interaction with their mothers and depends on the ability of a mother to respect the psychological space of her child.

Methodology: The leading method to study this problem was to establish the ties between the sovereignty of the preschooler’s psychological space, attachment to his/her mother and the preservation of his/her psychological health, which provided a comprehensive view of the peculiarities inherent in the qualitative relationship between mother and child. The main research methods we the questionnaire "Sovereignty of psychological space" by S.K.Nartova-Bochaver (2014a), the projective method "Children's attachment to the mothers based on game samples" by E. V. Skulacheva (2012), and the parent’s survey.

Main Findings: Relying on the evidence from the study of the children’s attachment to their mothers, and indicators of sovereignty of the child's psychological space and the survey of parents, we found that the effectiveness of the mother-child interaction is determined by the type of attachment that may lead to deprivation, integrity or hypertrophy of psychological boundaries.

Applications of this study: The presented research revealed the main attributes of the psychological health of preschool children and the importance of qualitative attachment and preservation of the psychological boundaries of a child. The research results make it possible to provide effective psychological assistance to families with children.

Novelty/Originality of this study: This paper is the first to have revealed that the psychological health of preschool children is determined by the type of their attachment to their mothers and the extent to which the boundaries of their psychological space remain integral and preserved.
SEASONAL TOURISM DEMAND IN LEBANESE SKI RESORTS
Authors: Ghadban Socrat , Shames Maya , Abou Arrage Jad , Leroux Erick
Published: December 2019

Purpose of the study: The main objective of this study is to analyze the profile of Lebanese ski resorts’ visitors, their motivations, preferences, and perceptions. Thus, authors seek to analyze the characteristics of seasonal tourism demand in Lebanese ski resorts for the sake of reducing seasonality.

Methodology: Quantitative methods were used and four out of the five ski resorts in Lebanon were analyzed. An online questionnaire was distributed to visitors, using a mix of self-selection and snowball sampling techniques. The questionnaire resulted in 206 respondents. Responses showed high internal validity with a Cronbach’s alpha of 0.83.

Main Findings: The relationship between place attachment and annual visitations was validated and authors were able to point the deteriorated value for money among resorts. Furthermore, the K-mean clustering resulted in segmenting visitors into three groups of interest to be targeted in order to reduce seasonality.

Implications: This study helps the winter and snow tourism stakeholders in Lebanon to reduce tourism seasonality and consequently develop sustainable tourism products. It also enhances previous studies conducted on seasonal tourism demand.

Limitations: The main limitation is that not all stakeholders were examined. Further research is needed to be conducted on visitors’ decision-making processes and their actual behavior. The proposed segments in this study are subject to future tests and investigations.

The novelty of the study: With no previous research attempting to analyze seasonal demand in Lebanese ski resorts; this study has a vital role to play in developing sustainable tourism products and helping winter and snow tourism stakeholders to reduce tourism seasonality. The clusters presented at the end of this paper are considered as a new proposition for ski resorts’ managers who are shifting toward all-season operations.
International Entrepreneurship at a Leading Brazilian Software Services Provider: The Case of CI&T
Authors: De Almeida Moraes Sylvia T. , Da Rocha Angela
Published: December 2019

Objective:  This case aims at discussing to what extent a company from an emerging country, Brazil, can become a major player on the global stage of the software industry.Method: Teaching case, based on personal interviews with top executives and secondary data.Main results: CI&T is one of the most successful Brazilian IT companies in establishing a position in foreign markets. The case offers a detailed description of the internationalization process of the firm and discusses how the firm can develop its internationalization, facing the challenges and opportunities for further expansion.Relevance/originality – This teaching case offers a real situation of an IT company from Brazil that developed a successful international strategy.Theoretical / Methodological Contributions – The case contributes to foster the understanding of the three major liabilities of companies from emerging countries – liabilities of foreignness, liabilities of outsidership and liabilities of smallness.Social / management contributions – The case can be used in International Business courses to improve managerial skills of students and executives.
Influência da Internacionalização e da Inovação na Competitividade Empresarial
Authors: Albuquerque Filho Antonio Rodrigues , Freire Maria Macileya Azevedo , De Luca Marcia Martins Mendes , Vasconcelos Alessandra Carvalho de
Published: December 2019

Objetivo: Investigar a influência da internacionalização e da inovação na competitividade em empresas de países do BRICS listadas na Nyse, sob a perspectiva da VBR.Método: De cunho descritivo e abordagem quantitativa, a pesquisa utiliza o teste de diferenças entre médias, a correlação e a regressão linear múltipla com dados em painel, para análise de dados de 2015 a 2017, de 64 empresas não financeiras sediadas em países do BRICS listadas na Nyse.Principais resultados: Corroborando os achados constatados nos testes de diferenças entre médias e correlação de Pearson, os resultados da regressão indicam que os indicadores de internacionalização e os de inovação não exercem influência sobre a competitividade das empresas. Ressalte-se, porém, que, na presença de estratégias de inovação, a rentabilidade se mostra relevante, denotando que quanto maior for a rentabilidade da organização, menor será o seu poder de competitividade.Relevância/originalidade: Apesar de individualmente a internacionalização e a inovação serem temas amplamente discutidos na literatura, é relevante que sejam explorados na perspectiva da competitividade empresarial, uma vez que são essenciais para o fortalecimento da economia e apontados como de grande valor organizacional. Outrossim, poucas pesquisas analisaram empiricamente a competitividade tendo como proxy o índice de Herfindahl-Hirschman.Contribuições teóricas/metodológicas: Destaca-se a contribuição do estudo para o campo acadêmico ao ponderar a internacionalização e a inovação como métricas multidimensionais para análise do envolvimento internacional das empresas e da adaptação estratégica de recursos como fontes de vantagem competitiva.
Eficiência Financeira, Atores e Interações: Um Estudo do Fluxo de Jogadores entre Clubes e as Equipes Semifinalistas de São Paulo em 2017
Authors: Silva Edimilson Eduardo da , Santos Agnaldo Antonio dos , Silveira Marco Antônio Pinheiro da , Mourão Paulo Jorge Reis
Published: December 2019

Objetivo: apresentar os índices de eficiência financeira dos clubes brasileiros, os atores e as interações que se destacaram nos fluxos de jogadores com os clubes semifinalistas de São Paulo em 2017.Método: na primeira etapa, extraíram-se informações sobre fluxos de jogadores e, na segunda etapa, dados sobre a receita operacional, fornecedores, custo de atletas profissionalizados e atletas não profissionalizados nos clubes do Brasil.Principais resultados – os escores eficiência financeira forneceram evidências do nível máximo de uso de recursos de atletas profissionalizados e não profissinalizados na geração de receita operacional no Palmeiras e Atlético Mineiro. Em relação aos atores tem-se que os clubes Grêmio Osasco Audax e Cruzeiro Esporte Clube disponibilizaram mais jogadores para os clubes semifinalistas. Nos fluxos de jogadores entre clubes do Brasil e de outros países, destacaram-se as equipes da Itália e de Portugal.Relevância/originalidade: demonstrar os scores de eficiência máximo dos clubes no uso de recursos na geração de receita operacional, os atores de destaque e as interações nos fluxos de jogadores.Contribuições metodológicas:uso simultâneo de técnicas paramétricas e não paramétricas como a Regressão Linear Múltipla, a Análise Envoltória de Dados (DEA) e a Análise de Redes sociais (ARS).Contribuições para a gestão: criação de indicadores de eficiência financeira como ferramentas de apoio à tomada de decisões gerenciais em clubes de futebol.
A High-Order Accurate Numerical Algorithm for the Numerical Solution of Burgers’ Equation
Authors: ZORSAHİN GORGULU Melis
Published: December 2019

In this study, a high accurate numerical solution of the Burgers’ equation is obtained. For this, the collocation method based on quintic B-spline functions for space discretization and the fourth-order single step method for time discretization are used. In order to see the efficiency of the algorithm, a test problem with an analytical solution is discussed and compared with the numerical solution obtained.
İki Ucu Ankastre U Çerçeve Yapının Modal Analizi
Authors: HÜSEYİNOĞLU Mesut , ABUT Tayfun
Published: December 2019

Endüstride kullanılan birçok makine elemanının dinamik davranışlarının belirlenmesi, yapının güvenli bir şekilde çalışması ve makinenin performansı açısından oldukça önemli bir konudur. Modal analiz tekniği yapıların dinamik özelliklerinin belirlenmesi amacıyla yaygın bir şekilde kullanılmaktadır. Bu çalışmada iki ucu ankastre bir U çerçeve yapının teorik ve deneysel modal analizleri gerçekleştirilmiştir. Teorik modal analiz ANSYS programı kullanılarak yapılmıştır. Deneysel modal analiz ise OROS Or36 titreşim analizörü ve OROS modal analiz yazılımı ile gerçekleştirilmiştir. Deneysel ve teorik çalışmalardan elde edilen sonuçlar karşılaştırılmış ve ANSYS’te oluşturulan modelin deneysel modeli başarılı bir şekilde temsil ettiği görülmüştür.
ИСПОЛЬЗОВАНИЕ ОСАДКОГЕЛЕОБРАЗУЮЩЕЙ КОМПОЗИЦИИ ДЛЯ СНИЖЕНИЯ ОБВОДНЕННОСТИ СКВАЖИН НА НЕФТЯНОЙ ЗАЛЕЖИ С ВЫСОКОВЯЗКОЙ НЕФТЬЮ
Authors: Поплыгина Ирина Сергеевна , Мордвинов Виктор Антонович
Published: December 2019

Актуальность. Обводнение добывающих скважин – естественный процесс при разработке нефтяных месторождений. На процесс обводнения скважин в первую очередь влияет неоднородность коллектора по фильтрационным свойствам – послойная (по разрезу) и зональная (по простиранию), наличие подошвенной воды, водонефтяных зон, повышенная вязкость пластовой нефти. Скорость перемещения фронта вытеснения увеличивается в высокопроницаемых слоях, что ускоряет процесс преждевременного обводнения скважин. Цель: выделить наиболее эффективные технологии водоизоляции в Пермском крае и исследовать возможность их использования на конкретном месторождении. Объект: карбонатные залежи с высоковязкой нефтью Ножовской группы месторождений в Пермском крае. Средняя вязкость пластовой нефти для 8 объектов разработки в отложениях турнейского яруса (Т) составляет 72,1 мПа*с при высоком значении коэффициента расчлененности (6,23). Средние значения соотношения обводненности и выработки запасов нефти доходят до 1,8. В таких условиях необходимо проведение работ по ограничению притока воды в добывающие скважины. Методы: анализ результатов выполненных работ по снижению обводненности скважин, гидродинамическое моделирование водоизоляционных и потоковыравнивающих работ в скважинах на нефтяном месторождении. Результаты. В Пермском крае более высокая эффективность при ограничении притока воды в добывающие скважины по промытым слоям для пластов с карбонатным коллектором отмечена для геле- и осадкообразующих технологий. В нагнетательных скважинах работы по выравниванию профилей приемистости осуществлялись в основном с применением цементов, смол и полиакриламида. Высокую эффективность показала технология с использованием осадко- и гелеобразующих компонентов на основе лигносульфонатов. Выполнено моделирование работы элемента залежи с использованием осадко- и гелеобразующих веществ для участка Березовского нефтяного месторождения. Приемистость верхнего интервала снизится на 82 % при проведении водоизоляционных работ. По добывающим скважинам в течение года обводненность снижается на 3…15 %, а суммарный дебит по нефти увеличивается на 0,9 т/сут.
ДИАГНОСТИРОВАНИЕ ВЕРТИКАЛЬНЫХ СТАЛЬНЫХ РЕЗЕРВУАРОВ КАК ИНСТРУМЕНТ ПОВЫШЕНИЯ БЕЗОПАСНОСТИ ЭКСПЛУАТАЦИИ ОБЪЕКТОВ НЕФТЕГАЗОВОЙ ОТРАСЛИ
Authors: Федосов Артем Васильевич , Абдрахманов Наиль Хадитович , Вадулина Надежда Вячеславовна , Хафизова Дильбар Фанилевна , Абдрахманова Карина Наилевна
Published: December 2019

Актуальность исследования обусловлена постоянным ростом числа резервуарных парков, выработавших установленный срок эксплуатации и являющихся морально и технически устаревшими, что неизбежно приводит к отказам оборудования и авариям на нефтегазовых объектах, в том числе наносит непоправимый вред экологии и жизни работников. В условиях ограниченных экономических рамок и трудностей ремонтно-восстановительных работ без вывода оборудования из эксплуатации предотвратить аварийные ситуации возможно лишь при проведении технического диагностирования и постоянного анализа состояния резервуаров с помощью дистанционного мониторинга. Цель: разработка и предложение метода неразрушающего контроля резервуара, позволяющего определять возможность его дальнейшей эксплуатации без остановки плановой работы, планировать дальнейший порядок ремонтных работ и оставшийся срок безопасной службы. Объекты: резервуар вертикальный стальной, акустико-эмиссионный метод контроля, инфраструктура резервуарного парка предприятия, дистанционные методы контроля оборудования. Методы: анализ нормативно-технических документов, прогнозные построения на предмет выявления опасных участков на резервуарах вертикальных стальных, моделирование беспроводной системы передачи данных. Результаты. Установлено, что с применением низкотемпературного режима нагружения резервуара при акустико-эмиссионном методе контроля с добавлением беспроводной GSM системы мониторинга можно существенно повысить безопасность эксплуатации резервуарных парков и оценить остаточный ресурс резервуаров. Выводы. С помощью акустико-эмиссионного контроля с низкотемпературным нагружением локальных участков резервуара, а также постоянного дистанционного мониторинга резервуаров нефтебазы, применяя беспроводную передачу информации по технологии GSM в режиме реального времени можно существенно уменьшить вероятность возникновения аварийных ситуаций.
ПРОГНОЗИРОВАНИЕ БИОДЕГРАДАЦИИ ТЯЖЕЛОЙ НЕФТИ АССОЦИАЦИЕЙ АБОРИГЕННЫХ НЕФТЕДЕСТРУКТИРУЮЩИХ МИКРООРГАНИЗМОВ
Authors: Сафаров Альберт Хамитович , Водопьянов Владимир Васильевич , Ягафарова Гузель Габдулловна , Дусаева Яна Маратовна , Акчурина Лилия Рамилевна
Published: December 2019

Актуальность исследования обусловлена необходимостью мониторинга и прогнозирования изменений, происходящих в нефтезагрязненном грунте, в частности, интенсивности процесса биотрансформации нефти и нефтепродуктов, а также изменения количества органотрофных микроорганизмов во времени. Данные, полученные в результате моделирования процессов в системе почва–нефть–микроорганизмы позволят повысить эффективность очистки нефтезагрязненного грунта и тем самым оздоровить окружающую природную среду. Целью исследования являлось создание математической модели, воспроизводящей процесс деструкции компонентов тяжелой нефти ассоциацией аборигенных нефтедеструктирующих микроорганизмов. Объектом исследования выступал грунт, загрязненный тяжелой нефтью Нижне-Кармальского месторождения (Республика Татарстан), а также ассоциация аборигенных нефтедеструктирующих микроорганизмов. Методы. В качестве базы для моделирования была рассмотрена модифицированная модель Келлера–Сигала, которая учитывала также процессы диффузии нефтепродуктов и хемотаксис микроорганизмов. Система уравнений решалась численно, для чего была написана программа на языке Python. Численное решение осуществлялось методом предиктор–корректор. Результаты. Проведенная работа состояла из двух этапов – экспериментального и расчетного. В ходе первого этапа работы было произведено исследование процесса биодеструкции нефти и нефтепродуктов консорциумом аборигенных нефтедеструктирующих микроорганизмов. На основании полученных результатов была сформирована база экспериментальных данных. На втором этапе по ранее полученным данным было осуществлено построение математической модели, описывающей процесс биодеградации тяжелой нефти и изменение численности нефтедеструктирующих микрорганизмов в нефтезагрязненном грунте. Проведенные вычисления показали достаточно высокую согласованность расчетных данных c экспериментальными. Полученная модель позволит уже на ранних этапах очистки спрогнозировать мероприятия по экологически безопасным способам очистки нефтезагрязненных грунтов.
ЭЛЕКТРОМАГНИТНАЯ СУШКА ВЛАЖНЫХ МАТЕРИАЛОВ С МАЛОЙ ГЛУБИНОЙ ПРОНИКНОВЕНИЯ СВЧ-ИЗЛУЧЕНИЯ В УСЛОВИЯХ ТЕПЛОСБРОСА РАДИАЦИЕЙ И КОНВЕКЦИЕЙ. II. СТАДИЯ ПОСТОЯННОЙ СКОРОСТИ СУШКИ
Authors: Саломатов Владимир Васильевич , Карелин Вадим Александрович , Саломатов Василий Владимирович
Published: December 2019

Актуальность исследования продиктована необходимостью разработки математических моделей СВЧ-нагрева и МВ-сушки влажных материалов для получения технологически оптимальных и экономически выгодных режимов. Настоящая публикация является продолжением статьи тех же авторов в «Известия Томского политехнического университета. Инжиниринг георесурсов», в которой с помощью математического моделирования подробно была изучена первая стадия сушки – стадия прогрева, когда теплообмен между поверхностью влажного тела и окружающей средой осуществляется за счет радиации и конвекции, а СВЧ-энергия поглощается поверхностным слоем из-за малой её глубины проникновения. Построены асимптотические решения этой нелинейной задачи для малых и больших значений безразмерного времени, востребованные инженерной практикой, как для параметрического анализа, так и для проведения оперативных расчетов. Подход, связанный с рассмотрением второй стадии – стадии постоянной скорости сушки – основан на более детальном изучении теплопереноса, а расчет скорости сушки ведется с использованием аппроксимационной зависимости А.В. Лыкова. Также предложено условие сшивки тепловых режимов I и II стадий процесса сушки. Цель: постановка задачи второго этапа СВЧ-сушки влажного материала – этапа постоянной скорости сушки – и реализация теоретического решения по определению распределения температурного поля по толщине слоя и величины скорости сушки. Объектом исследования является плоский слой влажного материала – уголь, песок, древесина и др. капиллярно-пористые массивы, на которые воздействует СВЧ-излучение. Такие материалы обладают высокой диэлектрической проницаемостью и как следствие весьма эффективно поглощают СВЧ-излучение, которое почти на 100 % преобразуется в тепловую энергию. Методы исследования связаны с математическим моделированием, в основе которого лежат уравнения электродинамики Максвелла и тепловлагопереноса А.В. Лыкова. В данной статье задача Максвелла решена независимо от задачи тепломассопереноса, поэтому плотность потока СВЧ-излучения считается известной. Также одной из особенностей данной задачи является рассмотрение материалов с малой глубиной поглощения, в силу чего в системе уравнений для нагрева источниковый член находится в граничном условии. В результате исследования с привлечением условий стационарного температурного поля и постоянства во времени плотности потока влагосодержания сформулирована и решена задача распределения температурного поля по толщине влажной пластины, которое строго следует закону квадратной параболы. Скорость сушки II стадии и критическое влагосодержание в конце II стадии определены из корреляционных зависимостей А.В. Лыкова. Дана сшивка решений для I и II стадии. Выполнен анализ построенных решений.
СОЛИТОННОЕ РЕШЕНИЕ ЭЛЕКТРОМЕХАНИЧЕСКИХ ПЕРЕХОДНЫХ ПРОЦЕССОВ В ЭНЕРГОСИСТЕМАХ, СНАБЖАЮЩИХ НЕФТЯНЫЕ И ГАЗОВЫЕ МЕСТОРОЖДЕНИЯ
Authors: Исаев Юсуп Ниязбекович , Колчанова Вероника Андреевна , Кулешова Елена Олеговна , Филипас Александр Александрович
Published: December 2019

Бесперебойное электроснабжение нефтяных и газовых месторождений остается важнейшей задачей мировой экономики. Одним из важнейших факторов, влияющих на отключение электроснабжения месторождений, является нарушение устойчивой работы генераторов. Устойчивая работа генераторов может быть нарушена при возникновении переходных процессов, вызванных короткими замыканиями или импульсными воздействиями на линии электропередач. При этом в электроэнергетической системе могут возникнуть уединенные волны – солитоны, характеризующиеся большой амплитудой и высокой скоростью распространения волны. В данной работе описываются причины возникновения таких волн. Приводится решение волнового уравнения электромеханической системы электроэнергетики, описывающего распространение уединенных волн. Решение рассматривается в фазовой плоскости, приводится численный пример расчета солитонного решения. Цель: найти солитонные решения в переходных процессах электромеханических систем и объяснить причины их возникновения, дать объяснения этого физического явления, определить, какую роль это явление играет в оценке устойчивости работы генераторов и предложить мероприятия по устранению нарушения устойчивости при наличии солитонной волны. Методы: метод фазовой плоскости, численное решение дифференциального уравнения методом Рунге– Кутта, метод пространства состояния. Результаты. Обнаружено, что при приближении решения уравнения турбина–генератор к границе динамической устойчивости возникают солитоны – одиночные всплески величины угла генератора. Выводы. При распространении эти волны ведут себя как частицы, что позволяет производить анализ обмена энергиями (потоками мощности) так же как анализ обмена энергиями механических частиц. При нарушении устойчивости возникают гармонические колебания, которые преобразуются в группу солитонов, распространение которых можно рассматривать как распространение частиц.