bluuebunny/crossref_metadata_2025 huggingface dataset:
Terapeutas cansadas: da precariedade do trabalho à precariedade da assistência na indústria do autismo
Authors: Ricci Thamy Eduarda , Fernandes Amanda Dourado Souza Akahosi , Cestari Leila Maria Quiles , Marcolino Taís Quevedo , Souza Marina Batista Chaves Azevedo de
Published: August 2023

O modelo de terapias especializadas para aquisição de habilidades para crianças, especialmente autistas, está crescendo sob a lógica neoliberal. Profissionais da saúde vivenciam a precarização do seu trabalho, com repercussões no cuidado de sua saúde e das crianças e famílias. Para aprofundar a compreensão de tais aspectos, esta pesquisa qualitativa, documental e retrospectiva, analisou 131 relatos de terapeutas de uma mídia social, sob as condições, dimensões e precarização do trabalho e dimensões históricas, políticas e desafios contemporâneos da assistência. Os resultados evidenciam cinco temas sobre a precarização do trabalho, e três abordando violência e violação dos direitos das crianças, institucionalização e a precarização das relações. Discute-se como a relação entre trabalho precário e assistência na "indústria do autismo" afeta profissionais, crianças e suas famílias. Para superar condutas históricas institucionalizantes e promover um cuidado efetivo, integrado às vivências e demandas cotidianas das crianças, discute-se a urgência do envolvimento de todos a quem essa questão interessa para encontrar soluções dignas diante da gravidade do problema em pauta.
LA DEMOSTRACIÓN DE IGUALDAD DE TRIÁNGULOS. CONSIDERACIONES PARA LA SECUNDARIA BÁSICA
Authors: Monteagudo Carlos Duardo , Marcelo Liety Díaz , Salvador Joaquín Suárez
Published: August 2023

El tema sobre igualdad de triángulos, base fundamental para el estudio de contenidos geométricos, se imparte y consolida en el octavo grado. La presente investigación expone la factibilidad de aplicación del Programa Heurístico General como alternativa para el tratamiento del contenido de enseñanza en las demostraciones de igualdad de triángulos en el octavo grado de Secundaria Básica. Se utiliza el método dialéctico materialista, con predominio del enfoque cuantitativo y asume una muestra de estudio de 23 estudiantes de un grupo de octavo grado seleccionado intencionalmente, en el que se aplicó la observación, el análisis del producto de la actividad y la entrevista entre otros métodos y técnicas, que permitieron constatar las dificultades en el proceso de enseñanza-aprendizaje de los contenidos relativos a la Unidad 2: Geometría plana y cálculo de cuerpos, específicamente en el tema de igualdad de triángulos. Este resulta complejo para los estudiantes, ya que deben aplicar conceptos, proposiciones y procedimientos. Por todo lo expuesto se precisa la utilización del Programa Heurístico General que es incorporado mediante ejercicios de demostración. La evaluación parcial de este trabajo brindó un resultado positivo, lo que muestra la efectividad de la propuesta.
Ultrasound Intensify the Flavonoid Production of the Willow Bracket Mushroom, Phellinus igniarius (Agaricomycetes), Fermentation Mycelia
Authors: Dong Yating , Ma Haile , Rashid Muhammad Tayyab , Tuly Jamila Akter , Guo Yiting , Ye Xiaofei , Sun Ling , Wu Bengang , Zhou Cunshan , He Ronghai , Gan Bingcheng , Wang Tao , Chen Mengxing , Wu Dan
Published: August 2023

This research aimed to use a novel and effective ultrasound (US) approach for obtaining high bio-compound production, hence proposing strategies for boosting active ingredient biosynthesis. Furthermore, the US promotes several physiological effects on the relevant organelles in the cell, morphological effects on the structure of Phellinus igniarius mycelium, and increases the transfer of nutrients and metabolites. One suitable US condition for flavonoid fermentation was determined as once per day for 7-9 days at a frequency 22 + 40 kHz, power density 120 W/L, treated 10 min, treatment off time 7 s. The flavonoid content and production increased about 47.51% and 101.81%, respectively, compared with the untreated fermentation (P < 0.05). SEM showed that sonication changes the morphology and structure of Ph. igniarius mycelium; TEM reveals the ultrasonic treatment causes organelle aggregation. The ultrasound could affect the metabolism of the biosynthesis of the active ingredients.
Prediction of breast cancer using machine learning algorithms on different datasets
Authors: Çağrı Yavuz Ömer , Calp M. Hanefi , Ceren Erkengel Hazel
Published: August 2023

Breast cancer is a disease that is becoming more and more common day by day, causing emotional and behavioral reactions and having fatal consequences if not detected early. At this point, traditional methods are insufficient, especially in early diagnosis. In this context, this study aimed to predict breast cancer by using machine learning (ML) algorithms on different datasets and to demonstrate the applicability of these algorithms. Algorithm performances were compared on balanced and unbalanced datasets, taking into account the performance metrics obtained in applications on different datasets. In addition, a model based on the Borda Voting method was developed by including the results obtained from four different algorithms (NB, KNN, DT, and RF) in the process. The prediction values obtained from each algorithm were written in different columns on the same excel file and the most repetitive value was accepted as the final result value. The developed model was tested on real data consisting of 60 records and the results were analyzed. When the results were examined, it was seen that higher performance was obtained with the proposed RF model compared to similar studies in the literature. Finally, the prediction results obtained with the developed model revealed the applicability of ML algorithms in the diagnosis of breast cancer.
Interpolation synthesis of thecontrollers for a multi-motorelectric drive system containingan elastically linked element
Authors: Nguyen Phu Dang , Vu Duc Tuan , Kumar Solanki Vijender , Lam Sinh Cong , Tran Duc-Tan
Published: August 2023

Partial differential equations, integral, differential, or other equations describe multi-motor automatic electric drive systems containing elastic conveyor belts. Because of the elastic and distributive nature of the system parameters, the transfer function describing them is often a complex expression, containing not only the arguments as a linear system but also the inertial and transcendental components. This makes the precise control of tension and speed synchronously much more complicated than the centralized parameter system. A promising numerical solution based on the real interpolation method will simplify the procedure for synthesizing control loops while preserving the characteristic properties of objects with distributed parameters. The objective of the study is to propose a feasible solution for synthesizing the regulators based on the real interpolation method; it allows direct operation with the original transfer function containing the inertial and transcendental components. In this paper, we proposed an approach to synthesize the control system for objects with distributed parameters using the real interpolation method to reduce computational capacity and synthesis error while preserving the properties of this object class. Building an experimental model of the two-motor electric drive system containing an elastic conveyor to verify the effectiveness of the proposed algorithm. The simulation and experimental results indicate that the control system with the received regulators operating stably and meets the required quality criteria. It proves the efficiency of the synthesis algorithm based on the real interpolation method.
Piezoelectric system with software management
Authors: Fandiño-Gómez Jayr Antonio , Cortes-López Segundo Leonardo , Valderrama-García Leonardo
Published: August 2023

This article is a product of the project "Piezoelectric system with software management", developed by Jayr Antonio Fandiño Gómez in conjunction with the University of Cundinamarca Ubaté sectional. Objective: To develop a source of clean energy with the help of piezoelectric materials, to take advantage of the passage of people within the University of Cundinamarca, Ubaté sectional, generating savings of "energy" resources. Method: Different phases have been carried out using different sensors in order to create a better product which is capable of generating clean energy that can be used for the lighting supply of this public space. Results: A piezoelectric tablet of large dimensions and optimized has been created, which was implemented for testing within the University of Cundinamarca, Ubaté sectional generating results that led to the creation of a NoSQL database. Conclusion: By implementing a new renewable energy system in an area where there are environmental concerns, awareness of the different problems generated by the advancement of technology will be generated. Limitation of the study: The acquisition of the sensors can be complicated due to the fact that this product is mostly created abroad.
Chocolate Chip Cookies (CCCOOCI) v1
Authors: J Acton Richard
Published: August 2023

A recipe for chocolate cookies By running this protocol and supplying your results you will be particpating in CCCOOCI (chocolate chip cookie optimisation open colaborative initiative) to learn more visit the project page: https://renkulab.io/projects/hdbi/data-management/cccooci
La violencia en Cahiers pour une morale de Jean-Paul Sartre
Authors: Savignano Alan Patricio
Published: August 2023

Este artículo rescata la original teoría de la violencia que Jean-Paul Sartre elabora a finales de los años cuarenta y deja plasmada en Cahiers pour une morale (1983). Los Cahiers son una obra póstuma e inconclusa en la cual el filósofo esbozó la ética prometida en las últimas páginas de El ser y la nada. En esta moral inacabada, la violencia es descripta fenomenológicamente como una empresa humana, libremente escogida en una situación existencial, que posee las siguientes características esenciales: la actitud intransigente, la función destructiva, la disociación de fines y medios, la ruptura de los lazos de solidaridad, la creencia mágica, la autojustificación, la exigencia y la desvalorización de la libertad ajena. El objetivo principal de este artículo es reconstruir esta teoría de modo tal que sea posible juzgar su valor en la actualidad ante el problema filosófico de definir qué es la violencia.
Fen Eğitiminde Yaşam Temelli Öğrenme Üzerine Bir Sistematik Derleme Çalışması
Authors: GENÇ Murat , SÖĞÜT Seda , GÜN ŞAHİN Esra , ZEYNOĞLU Ezgi
Published: August 2023

Bu çalışmanın amacı, 2018-2020 yılları aralığında fen bilimleri eğitiminde Yaşam Temelli Öğrenme, Bağlam Temelli Öğrenme, REACT’in etkililiğini farklı bakış açılarıyla araştıran yurt içi ve yurt dışı kaynaklı çalışmaları çözümlemek ve bir bütün içinde ilgili paydaşlara sunulabilecek bir derleme çalışması yapmaktır. Bu çalışmada sistematik derleme yöntemi kullanılmıştır. Araştırmada 2018-2020 yılları arasında yaşam temelli öğrenme, bağlam temelli öğrenme ve REACT stratejisi ile ilgili yayımlanmış olan DergiPark, ERIC, Web of Science veri tabanlarındaki makale ve Yükseköğretim Kurulu Başkanlığı (YÖK) Tez Merkezi veri tabanındaki tez çalışmaları taranmıştır. Literatür taraması 2018-2020 yılları arasında sınırlandırılmış olup; DergiPark, ERIC, Web of Science veri tabanındaki makaleler ile YÖK Tez Merkezi’ndeki tezler çalışmaya dâhil edilmiştir. Tarama yapmak için hem Türkçesi hem de İngilizcesi olmak üzere 3 anahtar kavram belirlenmiştir. YÖK Tez, DergiPark, ERIC ve Web of Science veri tabanlarında “yaşam temelli”, “bağlam temelli”, “REACT”, “context and problem-based learning”, “context-based”, “context-based approach”, “context-based approaches”, “context-based learning”, “REACT strategies”, “context-based course” anahtar kelimeleri ile literatür taraması yapılarak 22 adet tez çalışmasına, 85 adet makaleye ulaşılmıştır. Bu çalışmada elde edilen veriler içerik analizi yöntemi ile analiz edilmiştir. Araştırmalar; yayım yılı, yöntem/desen, veri toplama aracı, veri analizi, örneklem grubu ve incelenen konu temalarına uygun olarak incelenmiştir. Elde edilen bulgular sonucunda, öğrenme yaklaşımları ile ilgili yapılan araştırmalar içerisinde “Bağlam Temelli “ ve “Context-based” anahtar kavramlı çalışmaların çoğunlukta olduğu, REACT stratejisi kullanılan çalışmaların yıllar içinde giderek arttığı görülmektedir.
Trust and Distrust in Public Service Media: A Case Study from the Czech Republic
Authors: Urbániková Marína , Smejkal Klára
Published: August 2023

Although public service media is a trusted island in the media landscape of many countries, trust in public service media is not absolute and universal. This study adopts a qualitative approach to explore what trust and distrust entail for the public, a perspective rarely applied in trust research. Also, it explores the extent to which the sources of trust and distrust are the same and whether the concepts of trust and distrust are identical (only inverse), or linked but separate. It focuses on the Czech Republic, where the level of trust in the news is among the lowest in the world, yet public service media is the most trusted news source (Newman et al., 2022). Based on four focus group discussions with the general public (N = 24), this study analyzes the reasons for the audience’s trust and distrust in Czech public service media. There are three main categories: trust in the message (i.e., people trust public service media if, in their view, it provides objective, truthful, reliable, relevant, and fast information without sensationalism and anti-system views); trust in the source (i.e., people trust public service media if they perceive the public service media journalists as professional); and trust in the public service media organizations (i.e., people trust public service media if they perceive the regulatory framework as effective in ensuring independence from politics and oversight boards as a guarantee for quality). As the reasons leading to trust were not identical (only inverse) to the reasons leading to distrust, our findings suggest that trust and distrust in public service media are not two sides of the same coin.
The EU as an ATM? Media Perception Analysis of Next Generation Funds in Spain
Authors: Mayo-Cubero Marcos , García-Carretero Lucía , Establés María-José , Pedrero-Esteban Luis-Miguel
Published: August 2023

The Covid-19 pandemic has been a turning point in terms of communication and economics within the borders of the EU. Hence, the economic response to the consequences of the pandemic has been different from previous crises. Both factors influence the media’s representation of the European project, and the construction of this image is particularly relevant to generating a favourable public opinion towards the European project. This research aims to determine how the Spanish media represent the Next Generation recovery funds and to determine the main discourses around this issue. We analysed news items disseminated by a sample of six leading Spanish news media through qualitative and quantitative methods by applying content and critical discourse analysis. The selection collects data via Twitter from July 2021 to March 2022. We found that media discourse reflects a pro-European sentiment, departing from previous Eurosceptic views. Next Generation funds have positively influenced Spanish perception of the EU and shifted the narrative towards Europeanisation. The EU’s support for Spanish funds management advances European integration, but concerns about transparency and control remain. The findings show how the Spanish media present a pro-European view, placing the economic response as a window of opportunity for profound political, societal, and economic structural changes in Spain.
School Practitioners' Perceptions of the Behavioral Multi-tiered Systems of Support
Authors:   , Dennis Meghan , Vorndran Christina M.
Published: August 2023

The use of the Multitiered Systems of Supports framework is a tool used by schools to address the needs of students through assessment, intervention and progress monitoring to improve student outcomes. Over time, this framework has expanded from academic interventions to include interventions addressing student behavior and mental health. This dissertation explored fidelity of intervention through perceptions of school practitioners implementing such interventions. The purpose of this phenomenological study was to explore the essence of school practitioners' experiences with behavioral interventions, with the goal to understand how school practitioner perceptions impact behavior intervention implementation in the school setting. This phenomenological study included one on one interviews with a sample of school counselors, behavior specialists and prevention specialists in a K-8 environment. Additionally, a focus group with representation from all three school practitioner groups was conducted. In vivo coding and a focused coding methodology were employed to identify themes in the research to drive future planning of behavioral interventions. Key words: MTSS, PBIS, behavioral interventions, perceptions of behavioral interventions, student mental health
Speech Act Classification in Computational Linguistics Using Supervised Machine Learning Models
Authors:   , Dini Shadi , Hammrich Penny , Foster Aroutis
Published: August 2023

This dissertation utilizes two supervised machine learning models, Random Forest and Support Vector Machine (SVM), to classify speech acts, specifically direct and indirect Requests and Refusals, in a dataset of over 5000 emails. The study focuses on analyzing asynchronous communications, particularly emails, as authentic sources of data. By comparing the performance of Random Forest and SVM, the research demonstrates that SVM outperforms Random Forest in accurately classifying both direct and indirect speech acts. The findings have significant implications for various fields, including linguistics, natural language processing, and education, highlighting the potential of SVM in speech act classification tasks and its contribution to the analysis of conversational data.
A rare and challenging case of pineal gland tumor – A case report
Authors: BD Impana , S Seethalakshmi , R Raghavendran
Published: August 2023

Pineal gland tumors are of rare occurrence and may arise from pineal parenchymal cells, the neighboring glia or residual stem cells. Due to its rarity pineal gland tumors are often misdiagnosed. The World Health Organsation (WHO) classifies and grades pineal parenchymal tumors from grade I to grade IV. We present a case report of a rare pineal parenchymal tumor (PPT) in an adult female which was diagnosed mainly on histopathology and aided by immunohistochemistry. The case report includes review of histopathological features and grading of pineal region tumors of intermediate malignancy which is necessary for further management of such cases.
Application of the MVP (minimum viable product) approach for justifying the effectiveness of HR-analytics implementation
Authors: Belinskaya Marina N. , Pshenichnaya Elizaveta A. , Solovova Natalya V.
Published: August 2023

This article discusses the problem of implementing HR analytics in a company, namely the problem of the evidence base for the effectiveness of tools, methods and the overall system of HR analytics. There are many approaches to justification: peer review, someone else's experience, experiment, empirical way. The authors have developed an approach that allows you to prepare material for a business case for the introduction of HR analytics tools. The material is evidence of the effectiveness of HR analytics tools based on our own experience in implementing the Minimum Viable Product (MVP). This approach was borrowed from innovation management. Using the example of HR-analytics in the recruitment system, the efficiency of the MVP approach is demonstrated. Among the tools of HR-analytics the funnel of recruitment, calculation of recruitment costs and analysis of recruitment sources were considered. Improving the efficiency of recruitment service is substantiated by the authors through two indicators: reducing time costs, minimizing recruitment costs. Having calculated the effect of the proposed tools, it is proposed to calculate the efficiency through costs and results. Important in this work is the presence of practical experience in applying the MVP approach to substantiate the effectiveness of HR analytics in the recruitment system in a company. The example used the experience of a pharmaceutical company, which, after implementing the Minimum Viable Product in the form of several HR analytics tools, saw reserves for improving the efficiency of the recruitment system. HR analytics of the market for products and services for HR managers is an additional key to improving the efficiency of the recruitment system, it can increase the effective efficiency, which is also important to remember. The article reviewed the work of Dirk Jonker, programs, products for personnel managers (Talantiks and Pulse), services of job sites. The authors propose HR metrics and formulas for calculating the main and most important selection indicators, and also describe in detail the key HR analytics tools that anyone who has read the article can use.
Clustering of creative industries in the development of regional economy
Authors: Naumova Olga N.
Published: August 2023

The relevance of the study is related to the definition of the concepts of creative industries, creative economy, cluster of creative industries, which have entered the Russian reality together with national goals and strategic directions for the development of the domestic economy for the period up to 2030, providing new guidelines for the development of entrepreneurship, employment, and requiring state support measures. The purpose of the research is to determine the essence and main characteristics of clusters of creative industries in the regional economy. The objectives of the study are closely related to the hypothesis that the study and definition of economic activities corresponding to creative industries will allow an adequate assessment of the indicators and trends in the development of the creative economy in the Russian Federation as a whole and its individual territories. To conduct research, we used scientific methods that allowed us to quantify and qualitatively assess the essence of creative industries. The use of methods of deduction and induction, statistical analysis allowed us to differentiate the types of economic activities that characterize the directions of development of creative industries, and to identify trends in their economic development. The practical aspect of the research results is an integrated approach and the formation of the content and characteristics of the creative industries as a new sector in the national and regional economy.
Re: Porphyria Cutanea Tarda in a Patient with Myelofibrosis
Authors: Dos Santos Vitorino M , Sugai Taciana AM
Published: August 2023

NONE
Measuring Deformation of Deep Drawing of Various Alloys by Image Processing Using Matlab
Authors: Prabaharan T. , Periyaswamy P. , Mugendiran V. , Bovas Herbert Bejaxhin A.
Published: August 2023

Measuring deformation mostly is based on the contact type of measurements which utilize the gauges and instruments. But this type of contact will lead to error in the precise measurement because of errors by the contact, measuring instruments, and human. So, feel proud to introduce image processing in the field of measurement. Here, in this study deals the measurement of deformation of deep drawing specimen by image processing which is called as contact free method. This is invasive method of measurement in two dimensions.Deep drawing process is an important sheet metal forming in which flat sheet metal had been forced through the die in association with the forward punch force and opposing blank holder force. As the blank passes through the tool set converts 2D bank into 3D cup formation. The process of achieving the required diameter of the cup can be produced in single stage or multistage operation. In this study, experimental study had been conducted on single stage deep drawing process for assessment of deformation and strain in aluminum alloy, copper alloy and brass alloy. Cylindrical cup deep drawing experimental tests were performed with blank of 60 x 60 square plate with 1 mm thickness. Eventually this new approach will help to optimize the geometry parameters deep drawing specimen correlation with the Matlab results.
Biodegradable Nano-Cellulose and its Composite Materials for Food Packaging Applications : A Review
Authors: Halagalimath Rajeshwari , R Jyothilakshmi , Kottom Nagaraju
Published: August 2023

Bagasse is a fibrous material obtained after crushing sugarcane to extract its juice. this sugarcane bagasse can be utilized to produce cellulose nano-crystals for various applications. Researchers have been studying the manufacturing of nano-cellulose-based products and food packaging films. the evolution of environmentally friendly and ecologically balanced food packaging materials has gotten a lot of interest as a potential solution to partially replace the perishable fossil fuel-derived plastic. Nano-cellulose and so its uses have lately received considerable attention across both research and application areas due to their attractive characteristics such as exceptional mechanical properties, larger surface area, rich hydroxyl for alteration, and biological properties with 100 per cent environmental protection. It is widely produced around the world in big quantities. It is a sugar industry waste product. It is most widely employed in the paper industry, although researchers have proposed that various mechanical and chemical treatments can aid in the extraction of cellulosic fibres, pure cellulose, cellulose nano-fibers (CNF), and cellulose nano-crystals (CNC). These extracted components have a wide range of uses in the manufacturing of regenerated cellulosic fibre and composite materials. The extraction processes for these extracted components in food packaging are discussed in this review study, as well as their usual application in composite industries.
Performance and Comparison of Coated and Uncoated Tool Inserts in Machining of C45 Steel
Authors: N Puneeth Kumar , A S Srikantappa , B Manjunatha , . Anilkumar , Y Amruth , Manoj Nelakruthi , . Harshavardhan
Published: August 2023

Using coated and uncoated tool inserts, the machining operation is carried out on C45 steelto analyze and compare the tool performance. A study was done on C45 steel, its carboncontent ranges from 0.40 to 0.50 percent.C45 steel has traces of molybdenum, silicon,silicon dioxide, manganese, and phosphorus. In this work, comparison was made betweencoated and uncoated tool inserts for different samples of C45 steel which is having Sulphurand Phosphorus of varying percentage. As samples were obtained, they were converted tothe desired diameter and examined at various feed rates (0.125, 0.175, and 0.225 mm/min),cutting speeds (11.0, 15.58, and 19.47 m/min), and cut depth (0.5, 1and 1.5mm). Wear andtool tip temperature were looked at and contrasted. Findings indicated that the coated toolinserts used for machining has a good and better properties compared to uncoated toolinserts. Therefore, these traces in a small enough quantity produce superior outcomes.Additionally, the behavior of the material andhow it affected thecharacteristics ofthetooland work sample wereexaminedUsingSEMand EnergyDispersiveX-Ray analysis.
Wear Analysis and Experimentation of Sintered Al-SiCp and Al-B4Cp Composites with Deformation Predictions
Authors: Prabaharan T. , Bovas Herbert Bejaxhin A. , Dhanabalan S. , Ramanan N. , R Dilli Babu
Published: August 2023

Complex geometries and porous components are very difficult to manufacture using traditional methods. Powder metallurgy is a metal forming process that allows complex shapes to be easily formed without loss of material. Metal matrix composites are used for high thermal conductivity and high wear resistance. In Al-B4CP, the composition of boron carbide is changed by 5%, 10%, 15%, and 20%. Al-SiCp composites maintain similar weight fractions. The blended mixture is compacted and sintered to the required standard sample size. After heat treatment, samples are tested for wear rate using a pin-on-disc wear tester, which is analyzed with analysis software.
ZnO Polymer Nano Composites Synthesis, Characterization, and Thermo-Mechanical Property Comparison
Authors: Chrislin Mario J.C. , Christabel Shaji Y. , Brucely Y. , Ajith Sinthuja S. , Bovas Herbert Bejaxhin A. , Ramanan N.
Published: August 2023

Both the polyester resin matrix-based polymer ZnO nano composites and pure polyester sheet were synthesised using the solution casting method. The crystalline structure of the nano-particles was examined inside using X-ray diffraction (XRD). The fundamental polymer composition, additives, organic contaminants, and purity were all assessed by FTIR. A minor alteration in the absorption bands was seen in the polyester system with ZnO added. The thermal properties were examined using differential scanning calorimetry (DSC) and thermo gravimetric analysis (TGA), and the results unmistakably demonstrated the creation of a highly cross-linked polyester molecular structure or improved free volume fractions in polymer nano composites. A mechanical analyzer’s tensile and flexural strength tests revealed the potential for nanoparticle aggregation due to a strong interaction with resin. To calculate the relative permittivity and the loss of tangents (tan), dielectric studies had been used. Analysis of the hydrophobic properties of the pure and ZnO polyester nano composite.
A Numerical Investigation of Natural Convection in a Porous Enclosure with Lower Wall Heating
Authors: V.M Vijaya Kumara , . Aswatha , V Banu Prakash Reddy , D Amit Datta , V Balaji , A V Ashik
Published: August 2023

Fluid movement and heat transmission study of consistent and non-consistent heated porous material has emerged as a discrete study field in the last thirty years, owing to its relevance in abundant applications, including waste used in nuclear power plant and fibres insulations, solar collectors, and so on. In recent decades, there has been a surge in interest in studying various elements of the porous media. This enormous level of attention has resulted in a slew of research publications addressing a wide variety of issues affecting porous materials, including understanding their structure, deformation, and natural convective heat transport, to name a few. The investigate of the porous material is one of the classical topics in field of science. In this paper, we investigate the free convection in a trapezoidal porous enclosure with different Rayleigh numbers (10 1 ≤ Ra ≤ 103) and aspect ratios (0.25 ≤ H/L ≤ 1). The effect of Ra and AR on temperature contours, local and mean Nusselt numbers has been analyzed and presented. This provided a result in which the mean Nu increased by increasing the H/L ratio and Modified Ra. In addition, convection mode is dominant when Rayleigh number is high. The outcome results are differentiated with those found in the literature and were found to be in good accordance.
Thermal Management for Natural Convection within Porous Enclosures
Authors: V M Vijaya Kumara , . Aswatha , Kumar Vignesh N , Mandal Tejus R , V Shankar
Published: August 2023

Various simulations and numerical studies have been carried out for free convection heat transfer of a square enclosure filled with porous matrix for sinusoidal and uniform heating conditions also varying Rayleigh values from 1 to 500 by using a mathematical finite element simulation. The porous media chosen for this research is saturated water medium (H2O).The enclosure properties have been predefined as follows: The top and base walls of the enclosure are made adiabatic, whereas the right wall is kept at a steady cold temperature. The hot left wall is treated at varying temperatures. The Nusselt values as well as mean Nusselt values have been quantified for the aforementioned values. It has been observed that the mean Nusselt values rise with the surge in Rayleigh values. For the Rayleigh value of 500, we found that uniform heating condition showed larger values of streamline function when compared to Sinusoidal heating conditions. These simulations were performed by considering a Solar Fresnel as a real-world example. We hope that scholars and engineers collectively working on enhancing or aspiring to numerically model the thermal exchange through a square enclosure filled porous matrix will benefit from the information provided in this research article.
Artificial Coalification of Orange Peel for Extraction of Value Added Chemicals
Authors: Patil Mr. Siddanagouda M. , A.P. Pragathi , S. V. Shreya , M. Supritha , N. Abhilash , S. Iyengar Ananth
Published: August 2023

Waste to value added products is the aim of circular economy. Typical waste to value processes such as composting, briquetting, digestion are time consuming and gasification, and pyrolysis only produces energy. In the present research, a thermochemical process called as hydrothermal carbonization process is used to convert the organic wet waste to useful products. The HTC process converts the organic wet waste into coal like high carbon content material called hydrochar and the liquid component called as biocrude. The biocrude is a mixture of chemicals such as 5-HMF, Levulinic acid, Furfural and other chemicals used in pharmaceutical and cosmetic industry. Orange peel waste is processed in a HTC reactor in temperatures ranging between 180 to 220 o C, with the autogenous pressure. The calorific value of hydrochar produced is measured using bomb calorimeter, and is found to have enhancement over the feedstock. The biocrude is analysed using UV spectrometer and gas chromatography and mass spectroscopy to identify the components present. Compounds including anti-fungal, and anti-bacterial molecules are identified and reported.
To Study the Influence of Ethanol and EGR on Engine Performance and Emissions by the Integration of Taguchi and RSM for an Engine Fuelled with CAOME.
Authors: N Varun kumar Reddy , Sangashetty SG , Banapurmath Math NR , H Arun Kumar , R Vinod
Published: August 2023

With the rise in fossil fuel consumption rate, depletion in reserves and stringent pollution norms resulted in search of renewable and carbon neutral fuel. Ethanol is one such fuel that can be obtained from various feedstock’s including grains and green matter with high starch and sugar content such as corn, sugar cane and sugar beets. Even castor oil methyl esters which is non-edible in nature also fulfils the requirement of fuel for internal combustion engine. The traditional experimental scheme requires more time for optimization and extensive experiments need to perform as it is possible to vary only one parameter at a time. This also result in increase in cost and it doesn’t provide interactive effect among the chosen variables. Mathematical models of Taguchi method using design of experiments (DOE) provide good results. By using DOE, Taguchi L27 orthogonal array is considered. Analysis of variance (ANOVA), Regression Equation and signal-to-noise (S/ N) ratio are obtained to predict the optimal parameters and to evaluate the influence of significant conditions on performance, emission and combustion characteristics. It is observed from the experiments that ethanol blend percentage and EGR influences on the output parameters.
Experimental Study of Polymer Matrix Composites using Polyester, HEMP and Calcium Silicate.
Authors: Prabha Sachin , G.B. Dattatray
Published: August 2023

The present study deals with the preparation of polymer matrix composites with polyester resin as matrix and hemp as reinforced material and calcium silicate as filler particles’. The calcium silicate is available in powder form and it is known that, filler particle increases the mechanical properties of polymer matrix composites. In this project work the different percentage of calcium silicate is added in polyester resin to improve its hardness, strength and also mechanical properties of polyester resin. The objective of this project is to prepare PMCs using calcium silicate, hemp fibre and polyester resin using hand lay-up technique as per ASTM standards. In this project work, PMCs are prepared by varying three composition i.e. 2% CaSiO 3 + 5% hemp, and 93% polyester resin, 4% CaSiO3, 10% hemp and 86% polyester resin and 6% CaSiO 3, 15% hemp and 79% polyester resin. The experimental test will be carried on prepared PMCs and find out the different mechanical characteristics such as tensile strength, compression strength, flexural strength and also to study the dynamic behaviour of PMCs by using damping test with experimental set up.
Fractal Contact Mechanic Behaviour of Base Structural Steels in Abrasion
Authors: Chethan S. , Srinivasa K. , Hemanth B. R. , Hemaraju
Published: August 2023

Inelastic behaviour and fracture in the metals act as a major failure leading to permanent breakage of the machine elements. Such a type of failures may cause from variety of loading and forces and tribological behaviour is also one of the phenomena. Tribological failures may cause when two rubbing surfaces are abraded depending on the loading. In the present study abrasion studies were done on the three base structural steels namely mild steel, cast iron, high carbon high chromium steel and heat resistant steel. Materials are subjected varied normal loading, time and different velocities of abrader. Volume loss was found out and inelastic and damage behaviour were studied in scanning electron microscope. It was found that volume loss was depending on hardness and volume loss increases with increasing in normal load and abrader. Various wear modes were found along with little fracture in the subsurface.
Microstructure Characteristics and Properties of NiCrMoFeCoAl-30%SiO2 Composite Coating on T22 Boiler Tube Steel
Authors: Patil Viresh G , Somasundaram B. , Kandaiah Sakthivel
Published: August 2023

In the present investigation, the NiCrMoFeCoAl-30%SiO2 composite coating was sprayed on T22 bare steel with the HVOF technique. HVOFtechniqueallows the production of dense, excellently structured coatings with smoother surfaces and enhanced mechanical properties of the boiler materials. The produced coatings are characterized for their microstructure, and corrosion resistance by high-temperature corrosion.The specimen microstructure has been characterized by SEM/EDS and XRD methods. The coating thickness, porosity, microhardness, and coating density have been assessed.
Design and Analysis of Bipolar Plate of Polymer Electrolyte Membrane Fuel Cell Assembly used for Automotive Applications
Authors: T M Rakshith , S Kataraki Pramodkumar , Ahmed Janvekar Ayub , Zubair A F , Qasem Isam , A. Hussien Ahmed , Ishak Aulia , Mazlan M. , Hamid M. F.
Published: August 2023

A polymer electrolyte membrane fuel cell (PEMFC) is defined as a type of fuel cell used to generate voltage and current. A fuel cell produces very small amount of electrical energy about 0.7 volts. So, it is essential to stack the fuel cells in bipolar plate series connection for the production of the large amount of electrical energy to fulfil the requirement. However, it is required to stack them with uniform pressure distribution in order to minimize the chance of BPP, MEA and GDL damage, fuel leakage and contact resistance. The mechanical properties and geometrical attributes of PEMFC stack components were collected with the help of many journal papers and books for the sake of their design and simulation work. In this study, the finite element analysis (FEA) were employed to simulate the bipolar plates meant for the assessment of the uniform stress dissemination.
Microstructure and Tribological Property Correlations of Die Cast and Spray Formed Al-30 wt.% Si Alloy
Authors: Mohan H. K Chandra , S Devaraj , Swamy K. S Narayana , B K Venkatesh
Published: August 2023

Al-30 wt.% Si hypereutectic alloy was produced by die casting and spray forming technique. The microstructures, mechanical and tribological properties of the alloy were studied. The density of die cast and spray formed samples are measured using water displacement method by applying the Archimedes principle. The scanning electron micrographs of die cast and spray formed alloys revealed the morphological changes of silicon phase from coarse silicon needles to fine silicon needles due to high undercooling encountered in spray forming. The size of the hard silicon platelets are decreased from 22 µm to less than 10 µm as the processing method is changed from die casing to spray forming. The average Vickers micro hardness of die cast and spray formed alloy are 70.06±2.65 HV and 78.05±2.01 HV respectively. The respective yield strengths of die cast and spray formed alloy are 130±9MPa and 150 ±7 MPa and the compression strengths are 251±11.6 MPa and 283±6.32 MPa. The precipitation strengthening mechanism is found to be involved in spray formed alloy.
Modelling and Optimization of Orientated Beam with Tip Mass for Vibration Energy Harvesting using Piezoelectric Patches
Authors: Wali Laxmi. B. , Chandrasekhara C V
Published: August 2023

Energy harvesting is extracting energy from ambient sources. Vibration energy harvesting area have received attention of many researchers to power wireless sensors and low-power electronic devices from smart materials. In literature, authors have focused on analytical and finite element models of cantilever beam with tip mass. The paper focuses on the novel numerical technique for orientated cantilever beam bounded with piezoelectric patches and mounted with tip mass using the direct method with non-orthonormalisation to derive the frequency response function (FRF) for voltage, current and power output. MatLab programme is developed considering the Euler Bernoulli beam assumptions, constitutive equations of piezoelectric material and Hamilton’s principle. The MatLab programme is validated with the previous work on orthonormalisation electro-mechanical finite element for unimorph beam and good agreement is obtained. The dynamic characteristics of considered model is presented and optimized parameters are obtained.
Experimental Investigation of the Effect of Integrated Fins on Heat Transfer Rate of Double Pipe Heat Exchanger
Authors: B M Praveenkumara , Sadashive Gowda B , H V Naveen
Published: August 2023

In this paper, the effects of integrated fins on the thermal performance of the concentric tube heat exchanger with a variable flow rate of hot and cold water are discussed. The inner pipe is made of copper pipe of length = 800 mm, OD=30 mm, ID=26 mm, t=2 mm. the integrated fines of the geometry 1.25 mm and 1.5 mm pitch length, 1 mm of the depth of cut are considered in the study. The thermal performance of the heat exchanger with a flow rate of hot and cold fluids ranges from 0.014 kg s- 1 to 0.07 kg s-1 and the effects of parallel and counter flow direction are also discussed in detail. The experimental result confirms that the thermal performance of the concentric tube heat exchanger is more in the case of the tube with integrated fins and counter flow direction with the highest flow rate of water in the pipe and annulus of the heat exchanger.
Review Paper on Development of Nano Inserts for Machining HRSA Materials for Aerospace Applications
Authors: Kotian Shashidhar M , Narayanaswamy K. S. , S. M Dasharath
Published: August 2023

In the current scenario, cutting tool industries use the powder material tungsten carbide of 60-80 microns grain size to produce cutting inserts. There are a lot of scopes to improve the properties of cutting tool materials to enhance their ability to machine challenging materials like heat resistant super alloys (HRSA). Reducing the grain size of cutting tool material powder to nano level may help to increase the strength, substrate hardness, Fracture toughness, and thermal conductivity of the cutting insert. This review studies different strategies used to develop nano powders for the cutting tool application. We observed that most of the studies focused on the latest powders used in cutting tool industries like tungsten carbide, boron carbide powders which are reduced as nano powders, pressed, and sintered with different techniques like hot isostatic pressing (HIP), Spark plasma sintering. Finally, the current research gaps and the future challenges in understanding the development of nano powders for cutting tool applications are critically discussed, providing an interpretation of the possible directions for scientific development in this field.
Photovoltaic Energy Harvesting with Static and Dynamic Solar Modules Employing IoT-Enabled Performance Monitoring
Authors: Krismadinata Krismadinata , Asnil Asnil , Husnaini Irma , Lapisa Remon , Maulana Ricky , Yuhendri Muldi , Astrid Erita , Logamani Premalatha
Published: August 2023

This study examines the effectiveness of static and dynamic PV module models for solar energy gathering. The static design of the first solar panel is used, while the dynamic design of the second solar panel with a single-axis tracker is used. Finding the best model for capturing solar energy and turning it into electrical energy is the aim. Monitoring systems use IoT technologies. To detect variables including current, voltage, radiation, temperature, and humidity, the system has a number of sensors. The Thinger i.o program, coupled to the Arduino Uno used to control these sensors uses the Internet of Things (IoT) concept to evaluate and keep track of the outcomes of parameter measurements. As a result, the acquired measurement results can be viewed on the Thinger i.o application and checked remotely from any location. The three tests show that systems using dynamic ideas are better able to capture solar energy than static systems. The performance discrepancy is at its widest in the third test, when the dynamic system generates 14.4% more electrical energy than the static system.
Content Analysis of the Subject of Technology at Basic Schools in Slovakia within the Context of the Upcoming Education Reform
Authors: Hašková Alena , Lukáčová Danka
Published: August 2023

Since 1989, various initiatives aimed at supporting humanity, linguistic, information, technical or polytechnical education in basic schools in Slovakia (i.e. at primary and lower secondary schools according to ISCED) were announced and implemented. At the end of 2020 the Ministry of Education, Science, Research and Sport of the Slovak Republic announced its intention to carry out a curricular reform on the level of ISCED 1 and ISCED 2. The article presents starting points and conceptions of both the previous as well as the announced curricular reforms, and subsequently the authors focus on the impact of these reforms on the content of the subject of technology, in frame of which technical education of students at lower level of secondary education is carried out. From the authors' point of view, the curricular reform of the subject of technology should increase students' interest in technically oriented fields of study. In this context, they present results of a research study, the purpose of which was to determine how students evaluate the current content (before the announced reform) of the technology subject.