bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Mathematical Methods in Solving Practical Problems of Environmental Protection
Authors:   Georgian Technical University, Managadze Rusudan , Abzianidze Vera ,   Institute of Hydrogeology and Engineering Geology, Abzianidze Dimitri ,   Institute of Hydrogeology and Engineering Geology
Published: September 2021

The authors of this article considered the question of the effectiveness of the application of mathematical methods in the analysis of ecological processes in the fourth issue of this journal for 2018. In the proposed article, the authors continue to develop this idea, considering the interaction of a person with the environment this time. The authors’ main attention is focused on showing the important role of mathematics in human interaction with the environment. It is known that anthropogenic objects (settlements, various industrial enterprises, transport, etc.), as a result of their functioning, have different kinds of effects on a person. To study these processes, there is a need for the development of sciences in order to predict the state of the environment and manage the processes of ecological balance in the geological environment, between nature and the technosphere (technogenic activities of people). Mathematicians play a decisive role in the study of these processes. However, the subject of research is invariably difficult, because the study requires the unification of interrelated processes of the most diverse nature. Note that the organization of these studies is very difficult, because the study of the anthropogenic influence of man on the environment requires combining the activities of a number of specialists in various fields. A specialist-interpreter, capable of creating a common language of research in these conditions, turns out to be a mathematician. Thus, mathematical theories arose naturally in the process of studying the surrounding world; mathematical theories are an essential part of our understanding of the world.
Comparative Analysis of Western and Russian Mineral Reserve Classifications
Authors:   Ivane Javakhishvili Tbilisi State University, Tvalchrelidze Alexander , Chomakidze Natia ,   Georgian Technical University
Published: September 2021

Despite that Georgia has signed an Association Agreement with the European Union, by today its geological-mining legislation has not been synchronized with European mining codes. Georgian Law on Earth’s Interior is a calque of the obsolete Soviet law with minimum updates. At the same time, development of the private mining business is hampered by olden standards of exploration reporting and estimation and approval of reserves, which also are vestiges of olden Soviet standards. The article analyses in-depth the Russian and the Western reserve reporting codes and proves that development of mining industry in Georgia calls for immediate legislative approval of the Western standards and foundation of the Competent Persons’ institute. Such actions will not only promote development of private mining businesses but harness the Georgian mineral resource fund to the betterment of the country.
Criteria for Estimating Greenhouse Gas Emissions from Transport
Authors:   Georgian Technical University, Jishkariani Maka
Published: September 2021

At the present stage, economic research on climate change and its main problem requires in-depth scientific study and analysis of various factors. An important source of air pollution is the energy sector, especially solid and liquid fuels used for technological purposes in thermal power plants. In Georgia, 1/5 of the total electricity generated is produced in thermal power plants. The article analyses Greenhouse gas emissions in Georgia by sectors and sub-sectors as well the criteria for estimating fuel combustion, such as net calorific value of fuel and carbon content standard indicators. The formula for calculation of CO2, CH4 and N2O emissions from the transport vehicles is developed in this work.
Alloys with Shape Memory and Their Physical and Mechanical Properties
Authors:   Georgian Technical University, Mchedlishvili Zurab , Tavkhelidze Manana ,   Georgian Technical University
Published: September 2021

The article contains the list of alloys with shape memory and given their structural formulations. As an example, an alloy of nickel and titanium, named Nitinol ({Ni}_3Ti), characterized by the highest shape storage index. Here in the work, the analysis of changes in crystal structure of this alloy is made, at ground temperatures of material heating and cooling.
The Impact of Vibration Operational Reliability of Turning Mechanism of Gantry and Tower Cranes
Authors:   Georgian Technical University, Chkhaidze Тengiz , Merabishvili Gabriel ,   Georgian Technical University, Metreveli Alexander ,   Georgian Technical University
Published: September 2021

Impacts of vibration on operational reliability of turning mechanisms of gantry and rower cranes are considered. Besides that, the structural features of kinematic chain of drive, including gear transmission with internal large module teeth, roller bearing without retaining ring, excitement of torsional, bending low-frequency vibrations at operation in nominal mode of cargo lifting that causes the origination of of increasing friction moment and stop of turning mechanism are researched in this article. Moreover, the technological and structural solutions aimed on decreasing of excited vibrations are proposed, and the supporting-rotating rolling bearings without retaining ring with improved technical-economic indicators are considered.
Frecuencia de cambios morfológicos en biopsias gástricas asociadas a infección por Helicobacter Pylori
Authors: Melo-Peñaloza Mauricio Alberto , Mendoza-Rodríguez Andrea
Published: September 2021

Introducción: se han descrito cambios morfológicos asociados a la infección gástrica por H. como: gastritis crónica superficial, gastritis atrófica, gastritis folicular y metaplasia intestinal. Importancia: La atrofia y la metaplasia gástrica pertenecen a la cascada de cambios histológicos que conducen al cáncer gástrico.

Metodología: estudio retrospectivo de corte transversal en el que se analizaron pacientes con dispepsia; durante su examen se practicó endoscopia y biopsias gástricas. Se documentó infección o no por H. y los cambios morfológicos presentes.

Resultado: total de casos positivos para infección H. en biopsias gástricas 127/166 (76.5%), casos negativos para infección H. en biopsias gástricas 39/166 (23.4%). Edad promedio 45.38 años, sexo femenino 80/127 (63%), gastritis crónica superficial 61/127 (48%), gastritis nodular 43/127 (33.87%), atrofia gástrica 7/127 (5.5%), metaplasia intestinal 7/127 (5.5%). Biopsias negativas para H. con diagnóstico de atrofia 5/39 (12.8%), con hallazgo de metaplasia fueron: 4/39 (10.2%).

Conclusiones: los cambios morfológicos encontrados en biopsias gástricas son similares a la literatura universal. La atrofia y especialmente la metaplasia intestinal son cambios morfológicos asociados a la infección por H. y son a su vez factores de riesgo para el desarrollo del cáncer gástrico que fueron documentados en la serie que presentamos. Hay casos negativos para la infección H. , con cambios superficiales de atrofia y metaplasia por lo que es recomendable hacer estudios adicionales para descartar completamente la infección por H.pylori
Uso de amitriptilina como coadyuvante en el manejo de la enfermedad por reflujo gastro esofágico.
Authors: Morales Erazo Alexander
Published: September 2021

Artículo relacionado: Impacto de la optimización del tratamiento en pacientes con Enfermedad por Reflujo Gastroesofágico que no responden a Esomeprazol (vol. 46 # 2)
UTILITY OF FNAC AS A FIRST LINE INVESTIGATION IN THE EVALUATION OF PALPABLE BREAST LUMPS WITH HISTOPATHOLOGICAL CORRELATION: A FIVE YEAR STUDY.
Authors: Khare Manisha , J Saraswathi , Sable Yogita , Khatib Yasmeen , Gupte Prajakta
Published: September 2021

Introduction: Fine needle aspiration cytology (FNAC) is a simple cost-effective and rapid diagnostic
modality for the evaluation of breast lumps. The aim of the present study was to correlate the cytological
diagnosis with histopathological ndings and to nd out the accuracy of FNAC in the evaluation of breast lesions. FNAC is very
helpful in distinguishing benign from malignant lesions and deciding the further management of the patient.
Materials And Methods: The study comprised of 250 cases of FNAC of palpable breast lesions with histological correlation. All
the aspirates were examined using PAP and Giemsa stains. The accuracy of FNAC was calculated by determining the
sensitivity, specicity, positive predictive value, negative predictive value and accuracy.
Results: Total 250 cases were studied of which there were 246 female and 4 male patients. A concordant diagnosis was made
on FNAC in 134 out of 136 of benign lesions, one of two cases of suspicious for malignancy and all 112 cases of malignant
lesions. Fibroadenoma(FA) (63.2%) was the commonest benign lesion observed while ductal carcinoma (42%) was the most
frequent malignancy seen. In the diagnosis of breast lesions FNAC had a sensitivity of 99.12%, specicity of 98.54%, positive
predictive value of 98.25%, negative predictive value of 99.26% and accuracy of 98.8%.
Conclusion: FNAC is a reliable tool for diagnosis of breast lesions. It is minimally invasive and is a good alternative to biopsy in
the diagnosis of benign lesions. However for the cases which fall into “suspicious for malignancy” category biopsy is advisable.
PREVALENCE OF PSEUDOMONAS CAUSING SECONDARY INFECTION IN PULMONARY TUBERCULOSIS PATIENTS
Authors: Saini Manoj , Bhandari Chand
Published: September 2021

Background: Secondary bacterial infection is one of the most common complications in pulmonary
tuberculosis (PTB) patients. Gram negative bacteria were commonly isolated from from adults
hospitalized with secondary bacterial infection. So we conducted this study to assess the prevalence of secondary infection
caused by Pseudomonas among active pulmonary tuberculosis patients.
Materials and Method: It is a single centre hospital based observational study. 115 pulmonary tuberculosis patients aged
above 14 years, with suspicion of secondary infection clinically or having complaints of fever, productive cough, chest pain,
shortness of breath, and increased sputum purulence, inspite of taking antitubercular therapy or pulmonary tuberculosis
patients with high total leucocyte counts were included.
Results: Out of 115 samples sent for sputum pyogenic culture, approximately one fth (17.39%) were positive for Pseudomonas.
Mean age was 46.69 ± 16.40 years in our study.
Conclusion: Pseudomonas species are a major cause of secondary bacterial infection in patients with PTB on treatment.
WOMEN AND ENTREPRENEURSHIP: CARVING A NICHE BEYOND GENDER BIAS
Authors: M C Yadunandan
Published: September 2021

Entrepreneurship has been a world dominated by men.To break the shackles of gender discrimination and carving a
niche for oneself is not an easy process.Women across the globe have been successful in overcoming the gender bias
and have treaded this path with confidence.This paper is descriptive in nature. It shall also take a look into the socioeconomic and psychological perspectives of women as entrepreneurs. It shall touch upon the stereotyped values
associated with entrepreneurship and gender.
COMPARATIVE ANALYSIS OF PRESSURE CONTROLLED AND VOLUME CONTROLLED VENTILATION ON RESPIRATORY MECHANICS, HAEMODYNAMICS AND SYSTEMIC STRESS RESPONSE IN PATIENTS UNDERGOING SURGERY IN PRONE POSITION.
Authors: Gupta Divya , Purohit Shobha , Sharma Mamta
Published: September 2021

BACKGROUND: General Anaesthesia in prone position is related with increased airway pressure, decreased
pulmonary and thoracic compliance. AIM: Comparision of pressure controlled and volume controlled ventilation in
patients undergoing lumbar spine surgery in prone position.METHODS: After ethics committee approval & written
informed consent, a comparative randomized interventional study was conducted from July-December 2017.
Randomization was done using random number tables. Patients of either sex, ASA grade I&II, age 25-55 yrs were
included while those with severe pulmonary ,cardiovascular, endocrine disease & BMI> 30kg/m2 were excluded.
Patients were randomly assigned to VCV group (n = 30), or PCV group (n = 30). Haemodynamic (HR,SBP,DBP,MAP),
Respiratory (P-Peak,P-mean,C-dyn) variables,blood glucose,S.cortisol were measured and ABG analysis was done 10
minutes after intubation (T1), 30 minutes after prone positioning(T2) and 60 minuts after extubation(T3). RESULTS:
Demographic parameters , perioperative hemodynamic values were comparable with no significant statistical
difference.The P-Peak levels were lower and dynamic compliance was higher in PCV group during both T1 and T2 with
p value of less than 0.05 Postoperative PaO2 level was significantly higher in Group PCV compared with Group VCV.The
difference between post operative and preoperative serum cortisol and blood glucose levels was significantly less in
patients ventilated with PCV mode.CONCLUSION: According to our study,PCV mode is associated with lower P-peak
levels during prone position, better oxygenation postoperatively and lesser systemic stress response.We concluded
that PCV mode might be more appropriate in prone position surgeries.
THE FITNESS OF LANGUAGE, THE FORMATION OF A SPEECH COMMUNITY: A FLIP THROUGH PERIODICAL MAGAZINES FOR WOMEN
Authors: P Prajitha
Published: September 2021

A language evolves when it acquires the agency to handle any domain of knowledge.This is referred to as the fitness of
language. Ordinary day-to-day language is inadequate to communicate topics related to finance, sports, technology
and so on. The involvement of various speech communities proves to be critical here. This in turn plays a role in the
development of a speech community. By analysing womens periodical magazines based on the topics mentioned
above, this paper attempts to examine the extent of languages fitness in these topics and the manner in which the
market makes use of the speech community that gets created as part of it. A group that shares a particular mindset and
makes use of linguistic diversity may be called as speech community.This thesis elucidates how periodicals like Vanitha
and Grihalakshmi influence the community of women readers through a linguistic diversity that is simple, attractive,
open and
IMPLICATIONS OF WORKFORCE DIVERSITY ON PERFORMANCE AND ORGANISATIONAL
EFFECTIVENESS IN IT INDUSTRY – A CONCEPTUAL STUDY
Authors: R Sukanya , R Manjula
Published: September 2021

Organisation performance and its effectiveness always depend on the workforce incubated by the employers.
Workforce diversity plays a major role in employee's career and professional performance which needs to be focused
properly in order to manage it efficiently and effectively as it directly deals with overall organisational performance.As
per the previous research studies,workforce is inclusive of morale,culture and employee engagement where industries
inculcate the workforce culture wherein due to this the company performance fosters to industry standards. In the
present situation,the diversity is highly recognised and it also serves as a resource for an organization which means in
the global scenario, proving efficiency, increasing competency, attending the standards and benchmarks has become
one of the biggest challenge for the industries for which the major attention has to be paid.Overall management of work
culture is also a very important area to focus. In this regard, the present research focuses on the impact of workforce
diversity on organisational performance and its effectiveness in IT industry which also throw lights on individual
characteristics such as gender, age, education, knowledge and their thought process. This study has considered the
performance and organisational effectiveness as dependent variables and workforce diversity as independent
variable.To analyse the research data secondary source of data collection such as, journals, articles and online source
has been considered from which the findings and conclusions are drawn
AUTOMATIC SANITIZER DISPENSER BASED ON ATMEL ATMEGA 328P ARDUINO MICROCONTROLLER
Authors: Pradhan Suvikram , Sharma G. Avinash , Nayak Anshuman , Kumar D Jayanth
Published: September 2021

In the global outbreak of the covid-19 pandemic the cleaning of hands has become most necessary which helps in
prevention of germs which indirectly helps in reducing the cause of the diseases not only the covid-19 but various
diseases because most of the germs reaches our body through hands while we touch our face of eat something with dirty
hands. Now as prescribed by the WORLD HEALTH ORGANIZATION {WHO} to reduce the spreads we have to wash hands
thoroughly with soap and water regularly as well as we have to sanitize our hands with the help of the sanitization liquids
or gels. The most preferable form of the sanitization of the hands is considered as the use of sanitization liquids as
compared to washing hands with soap because sanitizers are much more effective as compared to soaps and can be
carried anywhere and can be used just by pouring in hands and rubbing thoroughly without the use of any water. And in
another lateral thinking way it is not only helps in reducing the germs but also helps in saving the water. Since squeezing
the sanitization bottle at times after times is considered unnecessary and unhygienic automation of the sanitization
comes into picture.
Design Thinking to Support the Development of a Safe Web-Based Health Information Seeking Platform for Older Adult Populations
Authors: Shaveet Eden , Gallegos Marissa , Castle Jonathan , Bryant Alison , Gualtieri Lisa
Published: September 2021

Abstract— The pervasiveness of online mis/disinformation escalated during the COVID-19
pandemic. To address the proliferation of online mis/disinformation, it is critical to build safety
into the tools older adults use to seek health information. On average, older adult populations
demonstrate disproportionate susceptibility to false messages under the guise of informative
authority and were the most engaged with false information about COVID-19 across online
platforms when compared to other age-groups. In a design-thinking challenge posed by AARP
to graduate students in a Digital Health course at Tufts University School of Medicine, students
leveraged existing solutions to develop a health information platform that is responsive to both
passive and active health information-seeking methods utilized by older adults in the United
States. This paper details the design-thinking process employed, results of primary research, an
overview of the prototyped platform, and insights relating to the design of effective health
information-seeking platforms for older adults.
Problems of containing the growth of unemployment in Russia as a factor of ensuring economic security
Authors: Strokov A , Ionov Vladimir
Published: September 2021

The article examines the problems of the development of market relations in Russia in the context of a high level of unemployment and measures to contain it, and possible ways to improve the effectiveness of measures to curb the growth of unemployment. Among the main threats to economic security associated with the factor of unemployment, the sanctions policy of Western countries and the impact of the coronavirus infection Covid-19 are considered.
Avaliação de doses de enxofre em cultivares de feijão-caupi (Vigna unguiculata (L.) Walp)
Authors: Pereira Cassiano Spaziani , Fiorini Ivan Vilela Andrade , Delmonstes Bruna de Lima , Lange Anderson , Silva Adriano Alves da
Published: September 2021

RESUMO – O feijão-caupi é uma leguminosa que vem ganhando grande importância econômica no estado de Mato Grosso, pela adaptação a diversas regiões e por apresentar baixo custo de produção. Este trabalho foi realizado com o objetivo de avaliar o desenvolvimento vegetativo das cultivares BRS Tumucumaque e BRS Guariba sob influência de diferentes doses de enxofre elementar. O experimento foi conduzido na área experimental da Universidade Federal de Mato Grosso (UFMT) em Sinop-MT, no período de outubro/2014 a janeiro/2015. Foi utilizado o delineamento experimental de blocos casualizados (DBC) com quatro repetições, em esquema fatorial 2x5 (duas cultivares: BRS Tumucumaque e BRS Guariba e cinco doses de enxofre elementar: 0, 8, 16, 32, 64 Kg ha-1). As doses de enxofre elementar (S0) foram aplicadas aos 16 dias após a semeadura (DAS). A área foliar foi avaliada aos 54 dias após a semeadura, o teor de clorofila total, a altura de planta e o diâmetro de caule foram avaliados aos 61 DAS, a massa seca de raízes e o número de vagens por planta foram avaliados aos 65 DAS. As médias das características analisadas não apresentaram diferenças significativas, indicando que a aplicação de enxofre elementar não influenciou no desenvolvimento vegetativo das cultivares BRS Guariba e BRS Tumucumaque e que a disponibilidade de enxofre no solo (32 mg.dm-3) foi suficiente para desenvolvimento normal das plantas.
The importance of working memory in children with Dyscalculia and Ageometria
Authors: Galitskaya Viktoriya , Drigas Athanasios
Published: September 2021

This article is a literature review about Dyscalculia and Ageometria which are part of specific learning disabilities (LD) in Mathematics. Initially, some possible causes of LD are presented. Types of dyscalculia are then listed and the article goes on focusing on Working Memory (WM) and Mathematical Anxiety which play an important role in students’ performance in Mathematics.
IMPLEMENTATION OF AQUAPONICS IN ARTIFICIAL POOLS FOR GROWING CARP AND STURGEON FISH
Authors: Степанова Татьяна Викторовна , Бочаров Павел Олегович , Погорелова Алёна Витальевна
Published: September 2021

Показана актуальность проблемы, связанной с особенностями ведения рыболовного хозяйства и растениеводства в условиях неблагоприятного климата, ограниченных территорий. Приведено описание опыта по внедрению аквапоники в схему выращивания осетровых и карповых рыб в искусственных бассейнах с использованием оборотной воды, включающую узлы очистки. В ходе исследования была разработана установка, принцип работы которой может быть использован, как решение проблематики выращивания рыб и растений в искусственно созданных условиях. Определены и описаны узлы фильтрации и очистки воды. Приведены показатели воды, показывающие работоспособность и эффективность установки. Проведено сравнение показателей оборотной воды при проведении опытов по выращиванию карповых и осетровых рыб. Приведены результаты экспериментального исследования скорости роста растений в аквапонной установке с использованием различных субстратов и воды. Выявлены преимущества проращивания семян растений при использовании оборотной воды из рыбоводного бассейна в сравнении с использованием водопроводной воды.

We demonstrated the relevance of the problem associated with the difficulty of fishing and plant growing in an unfavorable climate, limited territories. We described the experience of introducing aquaponics into the scheme of growing sturgeon and carp fish in artificial pools using circulating water, including purification units. In the course of the study we developed an installation, the principle of operation of which can be used as a solution to the problem of growing fish and plants in artificially created conditions. As well we identified and described the nodes of water filtration and its purification. We demonstrated indicators of water that show the operability and efficiency of the installation. We also carried out comparison of indicators of circulating water during experiments with growing carp and sturgeon fish. As well we made a comparison of the efficiency and growth rate of plants in an aquaponic installation using various substrates and water. The advantages of germination of plant seeds with the use of circulating water from the fish-breeding basin in comparison with the use of tap water have been revealed.
A REVIEW ON MECHANICAL PROPERTIES OF NATURAL FIBRE REINFORCED CONCRETE FOR RIGID PAVEMENTS
Authors: M.Venkata Naga Prasad  , Dr.J.Sridhar
Published: September 2021

This study focuses on fiber reinforcement, specifically the use of jute and coir as a fiber reinforcing material in concrete. Natural fibers have been used to provide substantial toughness and strength in a very fragile cement matrix composite. It is necessary to make effective changes in this regard. Uses a very alkaline cement matrix to achieve durability. It is preferable to have a chemical composition that is clear. Reinforce the cement and change the surface of the fibers composite. The usage of jute fiber in this article is discussed. Concrete and the impact it has on the characteristics of the concrete it produces, for example this is an attempt to review the work that has just been completed. In the discipline, as well as to establish a foundation for future study in that case. It is critical to create low-cost building and reinforcing techniques that are suited for developing countries. If agricultural by-products like coconut coir can be used to replace steel bars as reinforcement, building costs can be reduced. Down significantly the purpose of this study is to evaluate the characteristics of coconut fibers. Species produced in India and their uses in many fields of engineering, notably civil engineering enhancing the long-term durability of concrete and mortar using engineering as a building material with the addition of coconut fibers the overall objective is to look into the possibility of utilizing domestic resources. Wastes for construction on a tiny scale a review of several researchers’ experiences utilizing is presented in this publication. The performance of coconut coir as a reinforcing component is explored in depth.
minería sonorense, pieza clave en el cumplimiento de los 17 Objetivos del Desarrollo Sostenible (ODS), en la agenda 2030
Authors: Alegría Murrieta Maria Ananí , León Balderrama Jorge Ines , Cabanillas López Rafael
Published: September 2021

En los últimos años, el concepto de desarrollo sostenible (DS), se ha fortalecido, desde su primera descripción adoptada por la Comisión Bruntland en el año 1987; recientemente los 195 Miembros de la Organización de las Naciones Unidas (ONU), aprobaron un documento titulado “Transformar Nuestro Mundo: La Agenda 2030, para el Desarrollo Sostenible (ODS)”, los cuales estarán vigentes durante los años del 2015 al 2030.

El crecimiento económico y el impacto de la minería sobre el desarrollo económico, social y ambiental, no solo son carácter local, este trasciende fronteras y puede aprovecharse para crear nuevas infraestructuras, nuevas tecnologías y oportunidades en relación con la fuerza de trabajo, destacando que esta industrial tiene la oportunidad y el potencial necesario para contribuir positivamente en el logro de la nueva agenda 2030; para fines descriptivos en este artículo se analizarán las características del ODS, de la agenda 2030, desde el apartado o sección “ desarrollo económico ” o “económico” en la minería de oro del estado de Sonora, con énfasis en la región de Caborca, Sonora, México.
Comparative study of Different Topologies of Solar Photovoltaic fed Impedance-Source Inverter based Dynamic Voltage Restorer
Authors:   Department of Electrical & Electronics Engineering, ACE Engineering College, Secunderabad., Prasad Miska , Abdelaziz Almoataz Youssef ,   Faculty of Engineering & Technology, Future University in Egypt, Cairo, Egypt., Akella Ashok Kumar ,   Department of Electrical & Electronics Engineering, NIT Jamshedpur, India.
Published: September 2021

All customers require quality voltage, quality current and quality power from the utility, but usage of nonlinear loads generates voltage sag, swell and harmonics. This work examines the solar energy based various topologies like 3-Leg, 4-Leg, and 6-Leg Dynamic Voltage Restorer (DVR) for minimizing the voltage swell. To get most prominent power from the solar system Perturb & Observe (P&O) scheme is also used. The most famous topologies are approved utilizing MATLAB/SIMULINK programming to limiting voltage swell. The gained results are comparable nonetheless even possibly better in 6-leg PV-ZSI-DVR diverged from 3-leg and 4-leg PV-ZSI based DVRs.
TORQUE RIPPLE REDUCTION OF A BRUSHLESS DC MOTOR USING Y-SOURCE CONVERTER
Authors:   Department of EEE, K.L. University, Viziawada, India, Rao T.Venkateswara , D.V.N. Ananth ,   Department of EEE, Raghu Institute of Technology, Visakhapatnam, India
Published: September 2021

The brushless DC motor (BLDC) is a low cost, reliable and efficient motor for low power applications. In general, the speed, torque and current of the BLDC motor are controlled using a well tuned PI controller in the inner and outer control loops. This controller will be effective in reducing the dynamic speed error, but will produce large current ripples. This reference current when given to the inner control loop and controlled using hall-effect position sensing technique, leads to comparatively large ripples in the torque. Because of large dynamic behavior of dc link voltage when nominal rating capacitor is used, there will be torque ripples and reduction in rotor speed from the reference current value. Hence, to mitigate this torque ripples in BLDC motor a fast acting adjustable dc link voltage like chopper is generally used. The effective dc link voltage control with voltage boosting and controlling action is observed with Y-source converter and is compared with a Z-source converter in this paper. The Y-source converter is designed in such a way that, it will effectively control the speed and also produces lesser current ripples reference. Further, the inverter topology uses a six switch basic configuration but with a new switching strategy. The results are compared with a Z-source converter with the proposed Y-source converter under variable load torque and variable speed cases in MATLAB/ SIMULINK environment. It is found that, the torque ripples are reduced effectively without much change in the reference speed. Also, even at higher rotor speeds, the torque ripples and surges are also lesser.
Engineering and economic analysis of the production of sieve shaker for teaching particle size to students with visual impairment
Authors:   Departemen Pendidikan Khusus, Universitas Pendidikan Indonesia, Bandung, Indonesia, Maryanti Rina , Nandiyanto Asep Bayu Dani ,   Departemen Kimia, Universitas Pendidikan Indonesia, Bandung, Indonesia, Hufad Achmad ,   Departemen Pendidikan Khusus, Universitas Pendidikan Indonesia, Bandung, Indonesia, S Sunardi ,   Departemen Pendidikan Khusus, Universitas Pendidikan Indonesia, Bandung, Indonesia, Ragadhita Risti ,   Departemen Kimia, Universitas Pendidikan Indonesia, Bandung, Indonesia, Fiandini Meli ,   Departemen Kimia, Universitas Pendidikan Indonesia, Bandung, Indonesia, Bilad Muhammad Roil ,   Faculty of Applied Science and Enginering, Universitas Pendidikan Mandalika, Mataram,  Indonesia
Published: September 2021

The purpose of this study was to evaluate the feasibility study from the engineering and economic perspectives in the production of sieve shaker for teaching particle size to students with visual impairment. The sieve shaker is important as a tool for improving students' understanding of the definition of particles and their sizes. Different from other sieve shakers for industrial purposes, the present sieve shaker is inexpensive, simple, user-friendly, and portable. Since it is made for educational goals only and can be used for developing countries, the total cost is inexpensive. Engineering analysis was performed based on a mass balance analysis, whereas the economic evaluation was carried out using several economic parameters under the ideal and non-ideal conditions in 20 years of the project. The engineering evaluation confirmed the potentiality of the project even it is in small-scale industries because all processing steps could be carried out using commercially available equipment. Economic evaluation results showed positive values for all economic parameters with a few exceptions. This research was complemented by theories to support the definition and the importance of sieve shaker for supporting the education of students with special needs.
A model for minimizing feedback-length between activities of a project
Authors:   M.Sc. Faculty of Management and Industrial Engineering, Amirkabir University of  Technology, Tehran,Iran., Shahabadi Sheida , Gheidar-Kheljani Jafar ,   Assitant Professor, Management and Industrial Engineering Department, Malek Ashtar  University of Technology, Tehran, Iran, Ghodsypour Seyyed Hasan ,   Professor, Management and Industrial Engineering Department, Amirkabir University of  Technology, Tehran, Iran
Published: September 2021

Proper sequencing between activities has always been one of the major issues in project management. Sometimes it is needed to redo some activities especially in product development projects. It is assumed that one of the reasons for reworking some activities and backward can be due to the incompleteness of the information needed when doing them, and also assumed that having complete information requires cost. In this article, a network of activities is considered, which may require a duplication of the process due to the interdependence of information between them. In this paper, using the design structure matrix concept and interdependence between activities, a two-purpose model for determining the proper sequence of activities have been provided to minimize the length of feedback and reduce the cost of completing the information using matrix concept. To accurately solve this model, the combination Lexicographic and Augmented Epsilon Constraint is used to obtain the Pareto National Front, which shows an increase in the cost of reducing the degree of dependence between activities for reducing the feedback length between activities. From the Pareto front, the best answer was chosen in a way that, based on the economic justification of the project, the percentage of reduction in the feedback length would be higher than the percentage increase.
Real-time evaluation of compaction quality based on RF- ACGWO with high robustness and generalization ability
Authors:   State Key Laboratory of Hydraulic Engineering Simulation and safety, Tianjin University,  92Weijin Road, Nankai District, Tianjin 300072, China., Lin Weiwei , Cui Bo ,   State Key Laboratory of Hydraulic Engineering Simulation and safety, Tianjin University,  92Weijin Road, Nankai District, Tianjin 300072, China., Wang Jiajun ,   State Key Laboratory of Hydraulic Engineering Simulation and safety, Tianjin University,  92Weijin Road, Nankai District, Tianjin 300072, China., Kang Dong ,   State Key Laboratory of Hydraulic Engineering Simulation and safety, Tianjin University,  92Weijin Road, Nankai District, Tianjin 300072, China.
Published: September 2021

The effective evaluation of compaction quality is a key issue for the safety of earth-rock dams. However, existing prediction models of compaction quality are designed to improve prediction accuracy but generally ignore generalizability and robustness, resulting in deviations from practical evaluation results, making these models inapplicable to complex construction environments. To address these problems, a novel real-time evaluation model for construction unit compaction quality based on random forest optimized by adaptive chaos grey wolf algorithm (RF-ACGWO) is proposed in this article. In RF-ACGWO, RF predicts compaction quality, while ACGWO increases efficiency and accuracy for traditional RF parameter selection and improves the generalizability and robustness of the model. Also, meteorological factors at a project site are also considered to affect the model, thereby improving model accuracy. After embedding the proposed method in a Three-Dimensions (3D) rolling monitoring system, real-time evaluation, guidance and feedback on a project site can be obtained. Compared to the conventional evaluation methods, RF-ACGWO achieves the highest accuracy of 0.838, the best generalizability of 0.793 and the most stable robustness when applied to a large-scale, real-life hydraulic engineering project.
Degassing and layers variation effect on composite processing by vacuum assisted resin transfer moulding
Authors:   Associate Professor, Mechanical Engineering Department, Faculty of Technology &  Engineering, The M.S. University of Baroda, Vadodara, Gujarat, India., Bhatt Alpa Tapan , Gohil Piyush P ,   Associate Professor, Mechanical Engineering Department, Faculty of Technology &  Engineering, The M.S. University of Baroda, Vadodara, Gujarat, India., Chaudhary Vijaykumar ,   Associate Professor, Mechanical Engineering Department, Faculty of Technology &  Engineering, The M.S. University of Baroda, Vadodara, Gujarat, India.
Published: September 2021

Vacuum assisted resin transfer molding (VARTM) is a fiber reinforced composite (FRC) making process in which resin is impregnated to fabric by application of vacuum. This process is also known as vacuum infusion process. The critical issue in VARTM process is void generation. Voids form due to variety of reasons, most of which can be avoided. Vacuum degassing is one of the solutions which will reduce air entrapped inside resin during impregnation. In this work six laminates from jute and polyester resin were prepared, three with degassing and three without degassing with variation in number of jute layers 5, 10 and 15 respectively. Microscopic examination and mechanical properties have been observed before and after degassing. It was observed that degassing improves mechanical properties of composite laminates and reduce void content. It was observed that the thickness variation in laminate increased as number of layer increased.
Numerical study of heat flow characteristics of turbulent Taylor-Couette flow in slit wall mode
Authors:   School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China, Liu Dong , Mohammedsalih Mohammed ,   School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China, Kofi Amponsah-Gyenin Nana ,   School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China, Ding Shi-cheng ,   School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China, Sun Si-liang ,   School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China
Published: September 2021

Heat transfer enhancement is by far an important component in the design of numerous industrial applications of Taylor-Couette flow including electric motors and particularly rotating machinery. To optimize the performances of these machines, superior knowledge of the fluid flow is vital to better estimate the heat transfer distribution. This study will specifically consider the effect the slit number and width possess on the distribution of turbulent Taylor-Couette flow and the resulting heat transfer correlation in the annulus of two concentric cylinders under varying conditions. A numerical simulation method is intended for the study using varying slit structure parameters of widths (2.5 ≤ w ≤ 7.5) mm and fitted with 6, 9 and 12 number of slits. The slit effect is then investigated under both isotherm and non-isotherm conditions considering the interactions between fluid flow regions in the mainstream area and the annulus. The small-scale vortex that appears in the annulus region improves the heat transferability between the fluid in the annulus and the main region as well as the heat transfer performance of the model with a gradual increase in Reynolds number.
Inhibitory Effect of Poria cocos Polysaccharides on Proliferation, Migration, and Invasion of Lung Cancer Cells, A549
Authors: Jiang Hongyan , Duanmu Zhong
Published: September 2021

We have investigated the inhibitory effect of polysaccharides of Poria cocos on the proliferation, migration, and invasion of A549 lung cancer cells. The results showed that compared to the control group, the proliferation, migration, and invasion ability of all the treatment groups were inhibited, and the expression levels of ki-67 protein, matrix metalloproteinase-2, and matrix metalloproteinase-9 were also inhibited (P < 0.05). Moreover, polysaccharides of P. cocos significantly inhibited the expression of nuclear factor-kappa B (NF-κB) signaling pathway related genes p-p65 and p-IκB (P < 0.05). In conclusion, the mechanism of the inhibition of proliferation, migration, and invasion of lung cancer A549 cells by the polysaccharides of P. cocos may involve the inhibition of the NF-κB signaling pathway.
Investigation of the Antibiotic-Resistant ESKAPE Pathogens in Ramadi Hospitals, Iraq
Authors: Hamid M. Sharqi  , Omar M. Hassan  , A.S. Obaid
Published: September 2021

Bacterial species of the ESKAPE group (Enterococcus faecalis, Staphylococcus aureus, Klebsiellapneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Escherichia coli) are oftenresistant to antibiotics. The purpose of this study was to find out the antibiotics resistance formedby ESKAPE pathogens in hospitals in the city of Ramadi, in Iraq. All bacteria within this clinicallyrelevant ESKAPE group were isolated from September 2020 to April 2021. Identification of isolateswas performed by Vitek 2 system and the Sensitivity Test was carried out using a disk diffusionmethod. The majority of pathogens isolated from patients at Ramadi Hospitals belong to the ESKAPEgroup. The percentage of bacterial isolates was K. pneumoniae (33.96%), E. coli (20.75%), S. aureus(20.13%), P. aeruginosa (11.32 %), E. faecalis (9.43%), and A. baumannii (4.41%). Some isolates ofE. coli were Resistance to all antibiotics, while P. aeruginosa and K. pneumoniae were 100% resistantto Vancomycin and Tetracycline. The presence of the ESKAPE group of pathogens is a major problemin Ramadi city hospitals. The results of this study support the implementation of special antimicrobialstrategies to specifically target these microorganisms.
MỘT SỐ ĐẶC ĐIỂM CỦA QUÁ TRÌNH HỢP TÁC VIỆT NAM - LIÊN BANG NGA TRÊN LĨNH VỰC KINH TẾ GIAI ĐOẠN 2001 - 2018
Authors: Huyền Bùi Thị
Published: September 2021

Bài viết nghiên cứu về quan hệ kinh tế Việt-Nga giai đoạn 2001-2018 trên các lĩnh vực: Thương mại, đầu tư, hợp tác năng lượng dầu khí và rút ra những đặc điểm như sau: (i) Quan hệ kinh tế Việt-Nga được kết nối từ quá khứ đến hiện tại, được thúc đẩy bởi quan hệ chính trị - ngoại giao tốt đẹp; (ii) Quan hệ kinh tế Việt-Nga diễn ra giữa hai nền kinh tế thị trường chuyển đổi nhưng có sự chênh lệch rất lớn về quy mô, trình độ phát triển và sự khác biệt các giá trị, chiến lược; (iii) Đặc điểm nổi bật của quan hệ kinh tế song phương Việt-Nga đã có sự thay đổi tổng thể, chuyển từ nguyên tắc ý thức hệ sang nguyên tắc tin cậy lẫn nhau và bình đẳng cùng có lợi; (iv) Quan hệ kinh tế Việt-Nga mặc dù đã đạt được kết quả tích cực, xong chưa tương xứng với tiềm năng, lợi thế của mỗi nước, với quan hệ hữu nghị truyền thống và đối tác chiến lược toàn diện, hiệu quả hợp tác kinh tế chưa đạt tầm với mục tiêu chính trị đề ra.
Criteria ruling particle agglomeration
Authors: Vollath Dieter
Published: September 2021

Most of the technically important properties of nanomaterials, such as superparamagnetism or luminescence, depend on the particle size. During synthesis and handling of nanoparticles, agglomeration may occur. Agglomeration of nanoparticles may be controlled by different mechanisms. During synthesis one observes agglomeration controlled by the geometry and electrical charges of the particles. Additionally, one may find agglomeration controlled by thermodynamic interaction of the particles in the direction of a minimum of the free enthalpy. In this context, one may observe mechanisms leading to a reduction of the surface energy or controlled by the van der Waals interaction. Additionally, the ensemble may arrange in the direction of a maximum of the entropy. Simulations based on Monte Carlo methods teach that, in case of any energetic interaction of the particles, the influence of the entropy is minor or even negligible. Complementary to the simulations, the extremum of the entropy was determined using the Lagrange method. Both approaches yielded identical result for the particle size distribution of an agglomerated ensemble, that is, an exponential function characterized by two parameters. In this context, it is important to realize that one has to take care of fluctuations of the entropy.
Yapay Zekâ ve Stratejik Yönetim
Authors: İYİGÜN Necla Öykü
Published: September 2021

TRT Akademi Dergisinin Eylül 2021'de yayınlanan "Yapay Zekâ" temalı 13. sayısı için kaleme alınmış editör yazısıdır.
The Common bean (Phaselous vulgaris L.) Response to Different Levels of Organic and Inorganic Fertilizers
Authors: AHMADİ Ahmad Yar , ARAİN Mohammad Jan
Published: September 2021

The high cost and excess use of inorganic fertilizers are the important concerns for high and beneficial yield of common beans and at the same time the integrated crop management practices are the universal demands for agriculture and environment. Therefore, the research was carried out from June to Sept of 2018 in the botanical garden of Agriculture Faculty, Kabul University, Afghanistan to evaluate the influence of isolate and combine application of diammonium phosphate (DAP) and PM (PM) with different concentrations on the growth, yield and yield attributes of common bean. According to the results achieved, it was found that combination of 80 kg DAP ha-1 + 5ton PM ha-1 improved the performance of common bean, with respect to 2272.33 kg grain yield( GY) ha-1 over the isolate used of DAP and PM (10 ton PM ha-1, 130 kg DAP ha-1 and control, respectively). In addition, the application of 5 ton PM + 80 kg DAP ha-1 showed positive effects on growth and yield attributes while no significant effects were observed on control (without any fertilizer application) for any trait of common bean. There were also strong positive correlations within the growth and yield attributes which indicate the importance for common bean GY. The present research showed that integrated application of DAP + PM is a good source of P and other primary elements for the growth and yield performance of common beans.
Unusual winter activity of Bufo bufo (Anura: Bufonidae)
Authors: ALTUNIŞIK Abdullah , KARA Yılmaz
Published: September 2021

As ectotherms, amphibians in the northern hemisphere are forced into hibernation due to seasonal periods of low temperatures, shorter days or reduced food supplies. Although it has been reported in recent years that some ectothermic animals may be active even in winter due to the effect of global climate change, winter activity records for toads are uncommon. Therefore, we  would like to report a winter activity case from north Anatolia, Turkey via the common toad, Bufo bufo. Documenting these unusual winter events not only adds to the biological knowledge of the species, but also provides valuable preliminary evidence for analyzing climate change patterns.