bluuebunny/crossref_metadata_2025 huggingface dataset:
FORMAS DE APRENDIZAGENS NA INFÂNCIA
Authors: GUSTAVO PEREIRA VANESSA
Published: July 2021

O cérebro humano é um órgão de extrema potência, sua plasticidade se dá pela capacidade de reorganizar padrões e sistemas de conexões sinápticas com vistas à readequação do crescimento do organismo às novas capacidades intelectuais e comportamentais da criança. a plasticidade cerebral nem sempre deve ser entendida como adaptativa, no sentido de facilitar e/ou melhorar a vida da criança. A plasticidade pode ter aspectos negativos, por exemplo, envolvendo a formação de circuitos neurais reverberantes e com isto levando a uma maior excitabilidade da região envolvida com o processo de reorganização cerebral. Ainda que atenta aos aspectos emocionais, não é função da escola promover o ajustamento afetivo, a saúde mental, ou mesmo a felicidade dos alunos. Isto deve ser buscado através da ação conjunta e integrada dos setores econômicos, políticos e sociais da sociedade. Na verdade cabe à escola esforçar – se por propiciar um ambiente estável e seguro, onde as crianças se sintam bem, porque nestas condições a atividade intelectual fica facilitada. O brincar as crianças pequenas fazem quando não estão comendo, dormindo ou obedecendo à vontade dos adultos. As brincadeiras ocupam a maior parte de suas horas despertas e isso pode, literalmente, ser considerado como equivalente ao trabalho para elas. As brincadeiras são o modo básico pelo qual elas tomam consciência de seus corpos e de suas capacidades motoras. Brincar também serve como importante facilitador do crescimento cognitivo e afetivo da criança pequena, bem como importante meio de desenvolver tanto habilidades motoras refinadas.
Comparative Study of Thyristor vs IGBT Based AC-DC Power Converter
Authors: Islam Md. Saiful , Shovon Md. Rifat-Ul-Karim , Khan Abdul Goffar
Published: July 2021

This paper presents a comparative study of the application of Thyristor versus IGBT in AC-DC controlled power converter. Both simulation and practical experiment have been carried out to test the relationship between the average output voltage (Vdc) with firing angle (α, for Thyristor) and triggering pulse width (, for IGBT). Also the total harmonic distortion (THD) has been observed in both the cases. It is observed that IGBT based power converter introduces more harmonics in the system, in spite of more symmetrical output voltage wave shape.
A Comprehensive Study on the Impact of Various Nano-gratings on MSM-PDs for Enhancement in the Light Absorption
Authors: Islam Alif , Das Narottam , Uzzal Mohammad Mohiuddin
Published: July 2021

In this paper, we have analyzed metal-semiconductor-metal photodetectors (MSM-PDs) with different nano-grating structures or shapes to improve the light absorption capacity into the device in details for high-speed communication systems and networks. The plasmonic-based MSM-PD structure demonstrates a significant improvement in light absorption capacity for the developed device compared to conventional MSM-PDs i.e., devices that have not employed the nano-gratings. The light absorption capacity of the device is varied with the variation of geometrical shapes and parameters of the nano-gratings, such as the nano-grating height, slit width and so on. These nano-grating structures are assisting in light transmission through the central slit (i.e., subwavelength apertures) efficiently, resulting in the excitation of surface plasmon polaritons (SPPs) as the incident photons interact with the nano-gratings/ nano-corrugations. This improved light transmission in the central slit along with excited SPPs results in resonant light absorption in the device. This means the light trapped inside the central slit is triggered by the SPPs to a higher order magnitude. This causes the light absorption enhancement for the device, i.e., more light is transmitted through the device instead of reflecting back to the surface. The simulation results demonstrated that the light absorption enhancement factor (LAEF) for these devices have improved dramatically due to the nano-gratings. For modeling and simulation of these devices, Opti-FDTD tool is used which is based on finite difference time domain (FDTD) method. The application of these simulated devices is in the range of 800-850-nm. The simulation results are suitable for the design of nano-structured MSM-PDs that can be used in high-speed communication systems and sensor network systems.
An Economic and sustainable planning of Bhasan Char as an Exclusive tourism spot with off-grid SMART Green Energy System
Authors: Nasrin Taskina , Uzzal Mohammad Mohiuddin
Published: July 2021

Bhasan char is a coastal island at Hatiya Upzilla of Noakhali District. It is a single char which has been uncovered from the Bay of Bengal a few years back. An emergency humanitarian project implemented by the Bangladesh government at this coastal island “Bhasan Char”, from September 2017, to temporarily rehabilitate a portion of incoming Rohingya refugees before they can repatriate to their homeland, Myanmar. Under this project, Government of Bangladesh (GoB) carried out land development, construction of embankment as well as other infrastructures. Upon repatriation of Rohingya's to Myanmar, we can use the developed land & surroundings as exclusive tourist zone. This paper is an outline to establish Bhasan Char as an exclusive tourist spot and a feasibility analysis of an off-grid hybrid energy generation system for this proposed tourism spot. Here, we had conducted a hypothetical zonal design, energy estimation, off-grid energy distribution, energy generation and a sustainable tariff plan for this exclusive zone in modular basis.
Improvement of Bearing Capacity of Clay Soil Using Fly Ash
Authors: Hasnat Abul , Ahmed Safkat Tajwar , Mustafa Tahmid , Chowdhury Md. Samiullah , Prince S. M.
Published: July 2021

The principal aim of the study is to improve the engineering properties of the soil sample using fly ash as a binding material. Bangladeshi fly ash was used in this study. Effects of fly ash on physical and mechanical properties of soil (Atterberg limits, moisture-density relationship, and unconfined compressive strength) are evaluated in the presence of 0%, 2%, 4%, 5%, 8%, 10%, 15%, 20% & 25% fly ash. For understanding the improvement of engineering properties of soil, a parametric analysis is conducted to determine the allowable bearing capacity, settlement and the time required for the consolidation. The allowable bearing capacity is evaluated using several equations for both saturated and unsaturated conditions. It is found that for 5% fly ash content, the maximum allowable bearing capacity is achieved. The maximum value of allowable bearing capacity is 660.12 kN/m2 in the unsaturated condition. The increment of maximum allowable bearing capacity is 77.74% for 5% fly ash content. The lowest value of the settlement was 336 mm (saturated) and 183 mm (unsaturated) for 25% fly ash content. Considering normally consolidated soil, it is found that the least time required for consolidation is 3.19 years for 25% fly ash content.
Design of a cost-effective customized Electronic Health Record system to handle patient management during Covid-19 pandemic
Authors: Ahmed Tasnim , Sharif Saif bin , Joy Tahleel Abbas , Chowdhury Moaz Hossain , Imam Mohammad Hasan
Published: July 2021

Healthcare is one of the basic needs for human beings. Unfortunately, a densely populated country like Bangladesh has always struggled to provide adequate healthcare to all of its people, especially to the rural population. To handle with huge amount of data and coordination between the doctors and patients, electronic health record system (EHR) has become a necessity. During this Covid-19 pandemic, face to face consultation between frontline workers like doctors, and nurse and patients has become difficult. As a result, many patients are having difficulty in getting treatment from doctors. In Bangladesh’s perspective at this moment, a cost effective, energy efficient and portable device system is needed to build up a customized Electronic health record system. The proposed system can reduce medical errors about patient identification and treatment, increase effectiveness and timeliness of doctors and overall improve the health care of people of the rural area. Therefore, an easy to use, affordable, user-friendly E customized EHR system design is proposed in this paper by utilizing recent wireless communication techniques that will give the rural people better health service.
Design and Evaluation of a 32-bit Carry Select Adder using 4-bit Hybrid CLA Adder
Authors: Hossain Muhammad Saddam , Farhadur Arifin
Published: July 2021

Adder circuits play a remarkable role in modern microprocessor. Adders are widely used in critical paths of arithmetic operation such as multiplication and subtraction. A Carry Select Adder (CSA) design methodology using a modified 4-bit Carry Look-Ahead (CLA) Adder has been proposed in this research. The proposed 4-bit CLA used hybrid logic style based logic circuits for Carry Generate (Gi) and Carry Propagate (Pi) functions in order to improve performance and reduce the number of transistor used. The modified 4-bit CLA is used as the basic unit for implementation of 32-bit CSA. The proposed design of hybrid CLA based 32-bit CSA has been compared with conventional static CMOS based 32-bit CSA and 32-bit Ripple Cary Adder (RCA) by conducting simulation using Cadence Virtuoso. Power consumption and delay in the proposed 32-bit CSA found 322.6 (uW) and 0.556 (ns) whereas power and delay in the conventional 32-bit CSA was 455.4 (uW) and 0.667 (ns) respectively. We have done all the simulation using Cadence Virtuoso 90 nm tool.
Identification of Risk of Occurring Skin Cancer (Melanoma) Using Convolutional Neural Network (CNN)
Authors: Shawon Mayinuzzaman , Abedin Kazi Fakhrul , Majumder Anik , Mahmud Abir , Mishu Md Mahbub Chowdhury
Published: July 2021

Skin cancer is one of the most common malignancy in human, has drawn attention from researchers around the world. As skin cancer can turn into fatal if not treated in its earliest stages, the necessity of devising automated skin cancer diagnosis system that can automatically detect skin cancer efficiently in its earliest stage in a faster process than traditional one is of crucial importance. In this paper, a computer aided skin cancer diagnosis system based Convolutional Neural Network method has been shown. Our proposed system consists of five stages namely image acquisition, image preprocessing, image segmentation, feature extraction and classification We remove hair any noise from the images using dull then use median filter to smoothen the images. Next, k-means algorithm was applied for image segmentation on the preprocessed images. Finally, the segmented images were fed into CNN model for feature extraction and classification. The developed system can classify benign and melanoma type skin cancers from Dermoscopic images as accurate as 80.47%. While developing the skin cancer detection system, we compare accuracy score of other models such as Artificial Neural Network (ANN), K-Nearest Neighbor (KNN) and Random Forest with our proposed system. The proposed method has been tested on ‘ISIC Challenge 2016’ test dataset and an accuracy rate of 80.47% was obtained for accurately classifying benign and malignant skin lesions by our proposed model.
Short Vowels and Context Effects: The Case of English Speakers Reading Arabic
Authors: Shehata Asmaa
Published: July 2021

The present study examines the impact of both short vowels and context on adult native English speakers’ reading accuracy of Arabic orthography. To this end, two groups of adult Arabic learners with different proficiency levels were recruited: 30 second-year, and 30 third-year learners. Subjects were instructed to read 50 isolated words, 20 sentences and 10 paragraphs in two different reading conditions: vocalized and unvocalized. Findings demonstrated a significant positive influence of both short vowels and context on second-year learners’ word recognition of the target stimuli. That is, second year Arabic learners had better accuracy when reading vocalized texts compared to unvocalized ones and were significantly more accurate at reading paragraphs and sentences than isolated words. However, third-year students’ reading accuracy was only significantly affected by the reading context.
The Impact of Information Technology (IT) on Assessing the Quality of Notifications Based on Standard No. 2420 in the Public Sector in Kuwait
Authors: Alshammari Bader H. O. , Albeshtawi Sulieman Hussien
Published: July 2021

The researcher aimed to explore impact of information technology (IT) on assessing the quality of notifications based on standard No. 2420 in the public sector in Kuwait. He aimed to explore the impact of several variables - like: computers & software, communication systems, and IT users’ skills – on the quality of notifications based on standard No. 2420 in the public sector in Kuwait. The population consists from all the internal audit departments in ministries and public bodies in Kuwait. The researcher has chosen a conveyance sample consisting from 200 individuals. He distributed questionnaire forms to them. 167 questionnaire forms were retrieved. They are valid for statistical analysis. The researcher found that information technology (IT) has a significant impact on assessing the quality of notifications based on standard No. 2420 in the public sector in Kuwait.
Improvement of Learning Skills in Geometry Incorporating a Metacognitive Learning Model in Boys Compared to Girls
Authors: Nahmias Erez , Teicher Mina
Published: July 2021

“We learn by doing and by thinking about what we are doing.” (John Dewey)

In this article, we shall present findings that describe the degree to which metacognitive orientation contributes to the study of the geometry the plan in boys compared to girls in 9th grade of middle school. The geometry study process does not only involve knowledge but also high thinking abilities. Beyond the knowledge of definitions and sentences, the students are required to write a full, precise, and logically constructed proof, as well as to show the validity and its correctness. In this article, we shall present a model of metacognitive orientation aiming to develop higher-order thinking skills in geometry. We built and applied the model to 9th-grade students. Since students experience difficulties in the study of geometry, the development of a structured study process is required. Numerous studies clearly show that the study process involving metacognitive orientation improves their study ability and deepens their understanding of the topic in question. The question that we addressed was to what extent the metacognitive orientation in geometry impacted boys in comparison to girls?

In this study, we shall present data according to which metacognitive learning explicitly benefits girls more than boys. Nevertheless, as a modular model, it allowed every student of both sexes to strengthen the weak aspect and to overcome blockades inhibiting the learning process.
Fluid Structure Interaction Analysis of Wind Turbine Rotor Blades Considering Different Temperatures and Rotation Velocities
Authors: K. Zezatti Flores Mayra , Castro Gómez Laura , Urquiza Gustavo
Published: July 2021

Wind energy is the clean energy source that has had the highest installation growth worldwide. This energy uses the kinetic energy in the airflow currents to transform it into electrical energy through wind turbines. In this chapter, a rotor of a 2 MW of power wind turbine installed in Mexico is analyzed considering the wind velocity data and temperatures at each season of the year on the zone for the analysis in Computational Fluid Dynamics (CFD); subsequently, a Fluid–Structure Interaction (FSI) analysis was carried out to know the stress of the blades. The results show a relationship between temperature, air density, and power.
Microplastics and Environmental Health: Assessing Environmental Hazards in Haiti
Authors: St. Louis Daphenide , Apply Ammcise , Michel Daphnée , Emmanuel Evens
Published: July 2021

Microplastics (MP) refer to all plastic particles that are less than 5 mm in size. Over the past decades, several studies have highlighted the impact of microplastics (MP) on living organisms. In addition to being pollutants themselves, these synthetic polymers also act as vectors for the transport of various types of chemicals in natural ecosystems. MP has been ubiquitously detected in a wide range of shapes, polymers, sizes and concentrations in marine water, freshwater, agroecosystems, atmospheric, food and water environments. Drinking water, biota, and other remote places. According to the World Bank, over 80% of the world’s marine litter is plastic and the concentration of litter on Caribbean beaches is often high, with a high presence of single-use plastics and food containers. In its work, the World Health Organization (WHO) suggests an in-depth assessment of microplastics present in the environment and their potential consequences on human health, following the publication of an analysis of the state of research on microplastics in drinking water. It also calls for reducing plastic pollution to protect the environment and reduce human exposure. In Haiti, the bay of Port-au-Prince is the natural receptacle of all the urban effluents generated by human activities in the Metropolitan Zone. This urban wastewater carries household waste, sludge from pit latrines and sewage, industrial wastewater which largely contributes to the pollution of the bay. Furthermore, 1,673,750 tonnes per year of household waste, including 93,730 tonnes of plastic waste, are not collected. What are the environmental dangers represented by the MP contained in those wastes for living organisms in exposed tropical ecosystems? The purpose of this paper is: (i) to do a bibliographical review of the physical and chemical properties, as well as the toxicological profile of MP, (ii) to identify the environmental hazards associated with MP contained in urban waste in the metropolitan area of Port-au-Prince.
Bacterial Cellulose: Multipurpose Biodegradable Robust Nanomaterial
Authors: Kołodziejczyk Agata
Published: July 2021

One of actual global problem is clothes and packing materials biodegradability leading to tremendous water contamination. In order to develop ecologically friendly, game-changing in global industry fabric production, we propose a concept to implement kombucha. Kombucha is a symbiotic bacteria and yeast multispecies consortium producing the most abundant polymer on Earth - bacterial cellulose. There are many advantages of bacterial cellulose that are widely used in medicine, material science, food industry and waste management. Unfortunately: long time of bacterial cellulose polymerisation process, lack of its control, diversity in biological composition, finally, acidic smell and disturbances of kombucha growth - all this issues limit the interest of kombucha use to replace easy-accessible and widely applied synthetic materials. In this chapter will be described a revolutionary concept to develop practical and sustainable use of bacterial cellulose as natural alternative for synthetic materials, particularly for a synthetic fabrics and plastics replacement. The optimal cultivation conditions and examples of bacterial cellulose in applications for daily life will be explained.
Mycovirus Containing Aspergillus flavus and Acute Lymphoblastic Leukemia: Carcinogenesis beyond Mycotoxin Production
Authors: K. Tebbi Cameron , Kotta-Loizou Ioly , H.A. Coutts Robert
Published: July 2021

Carcinogenic effects of Aspergillus spp. have been well established and generally attributed to a variety of mycotoxin productions, particularly aflatoxins. It is known that most carcinogenic mycotoxins, with the exception of fumonisins, are genotoxic and mutagenic, causing chromosomal aberrations, micronuclei, DNA single-strand breaks, sister chromatid exchange, unscheduled DNA synthesis etc. Some Aspergillus spp. are infected with mycoviruses which can result in loss of aflatoxin production. The effects of mycovirus containing Aspergillus on human health have not been fully evaluated. Recent studies in patients with acute lymphoblastic leukemia, in full remission, have revealed the existence of antibody to the products of a certain Aspergillus flavus isolate which harbored an unknown mycovirus. Exposure of blood mononuclear cells from these patients, but not controls, to the products of this organism had reproduced cell surface phenotypes and genetic markers, characteristic of acute lymphoblastic leukemia. Carcinogenic effects of Aspergillus spp. may not always be mycotoxin related and this requires further investigation.
The Role p53 Protein in DNA Repair
Authors: Mary Bakhanashvili
Published: July 2021

The tumor suppressor p53 protein controls cell cycle and plays a vital role in preserving DNA integrity. p53 is activated by varied stress signals and the distribution of p53 between the different subcellular compartments depends on the cellular stress milieu. DNA repair pathways protect cells from damage that can lead to DNA breaks. The multi-functional p53 protein promotes DNA repair both directly and indirectly through multiple mechanisms; it accomplishes multi-compartmental functions by either numerous p53-controlled proteins or by its inherent biochemical activities. Accumulating evidence supports the contribution of p53 in the maintenance of the genomic integrity and in various steps of the DNA damage response, through its translocation into nucleus and mitochondria. p53 may also be utilized by viral polymerases in cytoplasm to maintain genomic integrity of viruses, thus expanding the role of p53 as a ‘guardian of the genome’. We summarize recent findings highlighting roles of p53 in DNA repair.
Home For The Holidays
Authors: Dubon Alexis ,   After Dinner Conversation
Published: July 2021

How do you find common ground with those that believe in a vast, intricate, media conspiracy to hide the truth? In this work of philosophical short story of fiction, the narrator drives out to his parent’s house to visit them for the holidays. Much to his surprise, when his parents open the door, they are only two feet tall! He is concerned that his parents, like many in the world, have shrunk to half their size. His parents, however, are equally concerned about their son because they believe he, and others in the world, have doubled in size. The son tries to explain to his parents that they have shrunk, that is why their house, and all their belongings, seem so large. However, his parents believe he, like many others, have an altered idea of what reality is, and that they have been lied to by the media and local officials. The son continues to come year after year to visit his tiny parents, who continue to refuse that they have changed, not the world around them.
The Dividual
Authors: Ghosh Mina Ikemoto ,   After Dinner Conversation
Published: July 2021

How do people come to terms with the different aspects of their personality? What happens if we “cut away” the parts of ourselves we don’t like? In this work of philosophical short fiction, the world has two related species, humans as we know them, and “dividuals.” Dividuals are related to humans, but, unlike humans, have a trunk with different people, representing the different aspects of their personalities. Seizo is a medical student who is selected for an exchange program to work with, and learn from Osqaris, a dividual he is to have ongoing interactions with. Over time, they become friends. In the end, Seizo learns that he is part dividual, with mixed parents, but was born primarily human. Osqaris was also born of mixed parents, but born primarily dividual. They both, it seems, have struggled to come to terms with how to show, and cut out, the parts of their personality they wish to hide.
Effect of the addition of egg white on the microbiological, physicochemical and sensory quality of steamed yogurt during fermentation and cold storage
Authors: Bouhadi Djilali , Hariri Ahmed , Benattouche Zouaoui , El Ouissi , Ibri Kada , Belkhodja Hamza , Bachir Raho
Published: July 2021

Yogurt or yoghurt is one of the most popular fermented dairy products worldwide and has gained widespread consumer acceptance as a healthy food. In this study, steamed yogurt, which contained lactic ferments (Lactobacillus bulgaricus and Streptococcus thermophilus), was produced with egg white addition at various levels (1%, 2%, 3%, 4% and 5%). The physicochemical, microbial and sensory analyses were determined to ascertain the quality attributes of the products. The dry matter, protein, viscosity and density values increased during storage. However, the microbiological properties of the five tested yogurt samples were within the international standards, and confirmed the safety and acceptability of the products. Steamed yogurts enriched with egg white were more preferred by panelists than the control yogurt in terms of sensory evaluation (flavor, color, taste and texture).The results indicated that the concentrations (2 and 3%) of egg white could be used to produce an egg white yogurt without significant adverse effects on the physicochemical, microbial, and sensory properties.
The use of commercial mediation as alternative dispute resolution tool in the Czech Republic, Hungary and Slovakia
Authors: Poór József , Lankašová Radka , Engle Allen , Szabó Katalin , Budavári-Takács Ildikó , Šeben Zoltán , Korényi Róbert , Szitás Péter , Juhász Tímea
Published: July 2021

For a long time, various companies and organizations have used traditional courts or other legal tools to resolve different complex disputes or problems. However, numerous influencing factors often interrupted this formalized problem-solving approach. In the countries of the former Eastern bloc, under the former Communist system, the Party often acted as mediator. This, of course, has changed totally since the political system has become democratic. Our study investigates conflict-solving styles, procedures and processes in Central Europe - the Czech Republic, Slovakia and Hungary. The study done in 297 companies in these three countries show that conflicts between individuals, employees and the company are found most often, while problems between the local company and associated parent companies are less frequently found. Regardless of the country, companies have spent at least 10% of their working time dealing with internal conflicts. Some 79% of organizations focus on managing external conflicts for at least 10% of their working time, while around 9% of companies use mediation as a method of resolving conflict. The organizations in the study do not differ from country to country in terms of the use and success of mediation practices.
Analysis of the tourists' motivation for staying in cities: The case study of the City of Belgrade
Authors: Podovac Milena
Published: July 2021

This paper presents the results of research on the tourists' motivation for staying in the City of Belgrade. The purpose of this paper is to identify the motives for which tourists usually stay in Belgrade and to examine the existence of statistically significant differences between the motives of tourists depending on their sociodemographic characteristics (gender, age, education and origin). The research sample included 250 respondents who had stayed in Belgrade. Belgrade is the most visited destination of urban tourism thanks to the quality and diversity of tourist offer, which can satisfy different motives of tourists. In order to collect primary data, a survey method was applied while descriptive statistical analysis, t-test of independent samples and one-factor analysis of variance (ANOVA) were used to process the collected data. The research findings indicate that the largest number of respondents stayed in Belgrade due to: business reasons, scientific conferences, visits to relatives and/or friends, sightseeing of the city and nightlife. Based on the theoretical analysis and results of empirical research, the recommendations for future research were also presented in the paper.
Effectiveness of bail-out mechanisms in the Eurozone: Global vs. pandemic crisis
Authors: Beljić Marina , Glavaški Olgica
Published: July 2021

This paper analyses the effectiveness of bail-out mechanisms after the global crisis in comparison to Covid-19 pandemic crisis in the selected Eurozone economies. It seems that in the circumstances of global instability, laissez-faire rules in economy are not enough, meaning that government interventions are desirable and unavoidable. In the Eurozone, the implementation of bail-out programs is related with the problem of a new "impossible trinity" and no-bail out clause. However, the adopted clause on non-use of the bail-out mechanism has had to be ignored several times in the past, and those implementations of bail-outs are focus of this paper. The research is based on descriptive statistical analysis and fixed panel model specification using available data in relation to the bail-out programs in the period 2011-2020 in selected Eurozone economies. The research shows that governments appear to have learned at least three lessons from the global crisis in relation to the bail-out mechanisms: (a) the need for quick implementation of emergency measures, (b) the bail-out mechanism was effective in reducing the fiscal deficit, however, caused an increase in the public debt, and (c) strengthening the fiscal framework of the Eurozone economies by defining supranational fiscal rules remains the essence of a stronger Eurozone and the European Union.
The analysis of the employee selection process in organizations in Central Serbia
Authors: Savić-Tot Tijana , Runić-Ristić Marija , Adžić Slobodan
Published: July 2021

The employee selection process represents one of the most delicate human resource management functions. Since the main purpose of the selection process is to attract and hire candidates who are going to fulfill the needs of an organization, the paper aims to analyze the characteristics of the selection process in organizations in Central Serbia. The problem of the research is to identify differences in the selection process among organizations that have different activities, legal forms, and the number of employees. The basic hypothesis that states that there are statistically significant differences in the selection process in studied organizations. The research results show, among other things, the deficiencies in the employee selection process, as well as the differences in the employee selection process in organizations that conduct different business activities, have different legal forms and the number of employees. Finally, the results of the study represent the basis for both its improvement and for further research within different industries.
Contact stress in helical bevel gears
Authors: Osakue Edward , Anetor Lucky , Harris Kendall
Published: July 2021

Helical bevel gears have inclined or twisted teeth on a conical surface and the common types are skew, spiral, zerol, and hypoid bevel gears. However, this study does not include hypoid bevel gears. Due to the geometric complexities of bevel gears, commonly used methods in their design are based on the concept of equivalent or virtual spur gear. The approach in this paper is based on the following assumptions, a) the helix angle of helical bevel gears is equal to mean spiral angle, b) the pitch diameter at the backend is defined as that of a helical gear, and c) the Tredgold's approximation is applied to the helical gear. Upon these premises, the contact stress capacity of helical bevel gears is formulated in explicit design parameters. The new contact stress capacity model is used to estimate the contact stress in three gear systems for three application examples and compared with previous solutions. Differences between the new estimated results and the previous solutions vary from -3% and -11%, with the new estimates being consistently but marginally or slightly lower than the previous solution values. Though the differences appear to be small, they are significant because the durability of gears is strongly influenced by the contact stress. For example, a 5% reduction in contact stress may result in almost 50% increase in durability in some steel materials. The equations developed do not apply to bevel crown gears.
Identification of engine damages of vintage vehicles with tribological examination
Authors: Papp Csenge , Kuti R.
Published: July 2021

Nowadays, keeping vintage vehicles in operation is becoming more and more popular, however, the reparation of occurring engine malfunctions, and the supply of particulate engine parts mean severe expenses to the owners. In case of older engines, the failure detection is not performed with the help of computerized diagnostics. In several cases the detection of failure is only possible with the disassembly of the engine. A cost-effective solution may be the application of tribological examinations, with which, the malfunctions may be revealed without the needless disassembly of the engine. The purpose of our research is to represent through the tribological examination of a VAZ-2101 (also known as Lada) engine type the practical application of the method, data analysis, evaluation of results and the steps of failure detection.
Short-term prediction of wind power density using convolutional LSTM network
Authors: Gupta Deepak , Kumar Vikas , Ayus Ishan , Vasudevan M. , Natarajan N.
Published: July 2021

Efficient extraction of renewable energy from wind depends on the reliable estimation of wind characteristics and optimization of wind farm installation and operation conditions. There exists uncertainty in the prediction of wind energy tapping potential based on the variability in wind behavior. Thus the estimation of wind power density based on empirical models demand subsequent data processing to ensure accuracy and reliability in energy computations. Present study analyses the reliability of the ANN-based machine learning approach in predicting wind power density for five stations (Chennai, Coimbatore, Madurai, Salem, and Tirunelveli) in the state of Tamil Nadu, India using five different non-linear models. The selected models such as Convolutional Neural Network (CNN), Dense Neural Network (DNN), Recurrent Neural Network (RNN), Bidirectional Long Short Term Memory (LSTM) Network, and linear regression are employed for comparing the data for a period from Jan 1980 to May 2018. Based on the results, it was found that the performance of (1->Conv1D|2->LSTM|1-dense) is better than the other models in estimating wind power density with minimum error values (based on mean absolute error and root mean squared error).
Complications at usage of the new anticoagulant therapy in elderly patients
Authors: Trailov Dunja , Despotović Nebojša
Published: July 2021

Introduction: New anticoagulant therapy (DOAC) was introduced few years ago. It is an alternative therapy for antagonists of vitamin K (VKA) in prevention and therapy of diseases with different etiology. Despite their advantages, bleeding stays a major complication. The fact is that there are no significant researches on this topic. Aim: To analyze the incidence of bleeding as a complication in patients treated with dabigatran. Material and methods: A retrospective study was conducted including 60 patients older than 65 years with nonvalvular atrial fibrillation treated with anticoagulant therapy. Half of this number was taking dabigatran (examined group) and half was taking warfarin (control group). Apart from demographical and clinical parameters, incidence, type and localization of bleeding was also followed. Results: In the group of patients who were taking dabigatran, in 13.3% of cases bleeding occurred as a complication of therapy. Among them, gastrointestinal bleeding was the most common (75%), but also hematomas on the body occurred (25%) and the therapy was immediately discontinued. In 45% of patients taking warfarin, bleeding was verified as a complication. From that number, 33.5% had gastrointestinal bleeding and epistaxis, 8.6% hematomas and 24.4% hematuria. By comparing these two groups, it can be concluded that incidence of bleeding in the group taking dabigatran was significantly lower than in the group taking warfarin (p = 0.038). Conclusion: In the examined group of patients older than 65, who were taking dabigatran, a significantly lower percentage of bleeding as a complication was noticed, compared to the control group taking VKA.
Assessment of the Cultural Project during the Unidad Popular: La Quinta Rueda and Cuadernos de la Realidad Nacional
Authors: Zamorano Díaz César
Published: July 2021

The Unidad Popular is a period where there was a deep reflection on culture and its interdependence with the political-social changes. After a first moment, during the period of the electoral campaign and a year after starting the implementation of a national project on the road to socialism, the discussions on the role of culture in this process intensified and whose resonances went through positive balances to strong criticism, especially the danger of recognizing culture only as a means of disseminating something that is done elsewhere, of an instrumentalization of its practices. This paper aims to analyze this discussion in two political-cultural journals that opened their pages to their understanding. In effect, both La quinta rueda and Cuadernos de la Realidad Nacional (also known as Cuadernos del CEREN) constitute critical frameworks from which we can better observe the diverse and heterogeneous discourses that not only manifest the heterogeneity of voices that circulated, but also the theoretical and reflexive intensity of this era.
COVID-19 and climate change: Challenges or opportunities for economic recovery
Authors: Markandya Anil , Mueller Alexander , Salcone Jacob , Thambi Simi , Hussain Salman
Published: July 2021

The paper reviews the impact that COVID-19 has had on the ambitions of countries to meet the Paris Accord of reducing emissions to keep global temperature increases to below 2 ºC in this century. It notes that as nations recover from the crises, if no additional measures are taken, emissions of greenhouse gases will rise again and return to their old pathway as they did after previous crises. The paper proposes actions in the short and medium terms to build back differently this time and help meet the global climate challenge.
Introduction: Climate crisis. The crevice of the planet
Authors: Faria Sérgio Henrique , Sanz María José
Published: July 2021

This monograph presents a collection of essays and perspectives on the multiple dimensions of the current climate crisis, characterised by the threat to the global environment and our social fabric posed by anthropogenic (human-induced) climate change.
RNase H-dependent amplification improves the accuracy of rolling circle amplification combined with loop-mediated isothermal amplification (RCA-LAMP)
Authors: Hasegawa Takema , Hapsari Diana , Iwahashi Hitoshi
Published: July 2021

The hybrid method upon combining rolling circle amplification and loop-mediated isothermal amplification (RCA-LAMP) was developed to quantify very small amount of different type of RNAs, such as miRNAs. RCA-LAMP can help detect short sequences through padlock probe (PLP) circularization and exhibit powerful DNA amplification. However, one of the factors that determines the detection limit of RCA-LAMP is non-specific amplification. In this study, we improved the accuracy of RCA-LAMP through applying RNase H-dependent PCR (rhPCR) technology. In this method, the non-specific amplification was suppressed by using the rh primer, which is designed through blocking the modification at the 3′end to stop DNA polymerase reaction and replacing the 6th DNA molecule from the end with RNA using RNase H2 enzyme. Traditional RCA-LAMP amplified the non-specific amplicons from linear PLP without a targeting reaction, while RCA-LAMP with rh primer and RNase H2 suppressed the non-specific amplification. Conversely, we identified the risk posed upon conducting PLP cyclization reaction using Splint R ligase in the RNA-targeting step that occurred even in the RNA-negative condition, which is another factor determining the detection limit of RCA-LAMP. Therefore, this study contributes in improving the accuracy of RNA quantification using RCA-LAMP.
Energy Security and Nigeria’s Sustainable Development: SDG 2030 (7)
Authors: Ajao Kajogbola Rasaq , Adeogun Adeniyi Ganiyu , Ajimotokan Habeeb Adewale , Shuaib Mohammed Ajibola
Published: July 2021

Over the years, affordable and sustainable energy has been regarded as the backbone of any country needed for the development of her social and economic sectors. Sustainable energy is vital to the production of goods and services, transport, agriculture, health as well as an instrument for politics, security, and diplomacy.  Nigeria is regarded as one of the most populous countries in Africa and is blessed with rich and diverse energy resources. However, poor access to affordable and sustainable energy by a larger percentage of the population has become a norm in the past decades and this has constituted greatly to the poor economic and social development of the country. This paper provides a minireview of the different potentials of energy resources in the country, prospects, and challenges of achieving energy security in Nigeria by the year 2030 as detailed in the United Nations sustainable development goal (SDG: 2030). The paper also discussed recent efforts by the government of Nigeria in tackling the energy crisis bedeviling the country. Findings from the review showed that Nigeria is blessed with abundant energy resources. However, the government needs to be proactive in the implementation of some of the proposed actions such as having a clear policy direction on energy and inclusion of renewable energy sources into the energy mix and reduction in energy wastage in its stride towards meeting sustainable development goal (SDG: 7) by the year 2030.
Impact of Parental Involvement in Homework on Children’s learning
Authors: Chophel Tshering , Choeda Ugyen
Published: July 2021

Our service as the principal in a very remote school under Mongar District evoked our conscience in realizing the impact of parental involvement in homework on children’s learning. Being in the farm with many daily chores and activities, the parents’ concern for children’s learning was left as a secondary option.

The parents have vital roles to play in the life of a child. The involvement of parents determines the future of the child, and the parental involvement was seen as a means to bridge the gap between the school and home. Family is the primary cell of society where the child's upbringing must begin since his birth.

The researcher used the qualitative approach and phenomenology as a research design. The study involved twelve interview participants, comprising of 3 principals, 3 teachers, 3 students and 3 parents from the participating schools in Yadi Cluster under Mongar District. The data were collected through the use of semi-structured interviews. The interviews were audio-taped, transcribed, and then analyzed using a thematic analysis approach, and compared to previous research gleaned from the extensive literature review.

The findings of the study reveal that there are contextual factors that contribute to less parental involvement in their children’s homework. There is a lack of parental care, especially in terms of academic support from parents in their children's learning in the remote setting of Bhutan. Basic education for parents is felt highly required to enable them to realize their support for their children in writing homework to perform better in the school. Non-formal Education (NFE) centers are recommended to be the platform to address the issues.
Design and Evaluation of Natamycin Nanocrystals Loaded In Situ Gel for Ophthalmic Administration
Authors: Das Roshni , Koland Marina , Sindhoor S. M.
Published: July 2021

Background: Natamycin belongs to a large group of naturally occurring polyene antifungal antibiotics derived from Streptomyces natalensis. Natamycin has a restrictive pharmaceutical role because of its extremely low aqueous solubility, which severely reduces the bioavailability of the drug. To improve the absorption of the drug, nanocrystals of natamycin were prepared and incorporated into in situ gel.
Aim: To improve the solubility and absorption of natamycin nanocrystals by preparing nanocrystal in situ gel of natamycin for ophthalmic delivery
Methodology: Natamycin nanocrystal was prepared using Sono-Precipitation method. Box-Behnken approach was employed to assess the influence of independent variables, namely concentration of stabilizer, sonication time and amplitude on particle size and zeta potential of the prepared nanocrystal.
Optimized natamycin nanocrystal in situ gel formulations was characterized for various parameters like pH, viscosity, drug content, in vitro drug release and ex vivo permeation studies.
Results: The optimized formulation of natamycin nanocrystal with a particle size of  293.9nm and zeta potential -14.6mV was incorporated into in situ gels. The pH triggered in situ gel was prepared using Carbopol and Hydroxypropyl methylcellulose (HPMC)., which showed clear preparation, pH of the formulation was closed to the pH of tear fluid, i.e., 7.4, viscosity showed pseudoplastic behaviour with immediate gelation remained for an extended period, and the drug content was around 99.70%. From the characterizations given above, PF-4 was optimized and evaluated for In vitro drug release showing slow and sustained release when compared to the marketed formulation and followed first-order kinetics with the diffusion-controlled mechanism. Ex vivo permeation through goat's cornea of PF-4 showed better permeation than marketed formulation. The stability studies of PF-4 showed that formulation was stable at the appropriate condition.
Conclusion: Nanocrystals formulations of natamycin was successfully formulated and incorporated into in situ gels. Further in vivo studies need to be carried out for confirmation of pharmacological activity
Case Report on Management of Pregnancy in a Patient with Small Muscular Ventricular Septal Defect
Authors: Fating Lina
Published: July 2021

Introduction: Maternal morbidity and mortality during pregnancy is significantly associated with hypertensive disorders.

Patient history: A 33 years old female was admitted in AVBRH with chief complaint of breathing difficulty with G2P1A1L1 having 30 weeks of gestational age with previous LSCS and conception with small muscular ventricular septal defect, normal function and rhythm for the period of gestation.

Obstetric history: Patient had bad obstetric history of 1 induced abortion.

Clinical findings: The patient had undergone various investigations like blood tests, USG, Physical examination and antenatal per abdominal examination.

Medical Management: Patient was treated with calcium supplement and iron supplement. Nursing management: Administered fluid replacement i.e. DNS and RL, Foetal monitoring, hourly vital sign monitoring.

Conclusion: Timely treatment of Ventricular Small Muscular Septal Defect and Management in pregnancy improved the outcome of pregnancy.