7 research outputs found
Development and characterization of sugar palm fiber-reinforced polymer composites for photovoltaic backsheet material
No full textNatural fiber composites (NFCs) are reinforcing fibers extracted from
biodegradable, renewable, and natural green resources. NFCs are employed in countless indoor
and outdoor applications. This study introduces a new characterization and development of
short sugar palm fiber (SSPF) reinforced polyvinylidene fluoride (PVDF) polymer, for photovoltaic
(PV) applications. Due to the urgent need for efficient and resilient PV
backsheets, this work characterizes new natural fiber composites to enhance durability,
weatherability, efficiency, and functionality. A decision model was initially introduced to
prioritize and determine the most appropriate polymer matrix type for SSPFs reinforced polymer
composites. This process was accomplished using an integrated multi- criteria evaluation method
based on three different methodologies: the analytic hierarchy process (AHP), technique for order
of preference by similarity to ideal solution (TOPSIS), and the elimination and choice
expressing reality (ELECTRE). A novel tripartite analysis was developed to display the aggregate
evaluation of the three methods. PVDF was introduced as a potential polymer for composite
preparation. Following fabrication, an in-depth investigation was accomplished to examine the
mechanical, nanomechanical, physical, thermal, optical, and technical properties of
PVDF-SSPF composites as potential alternatives for PV backsheets. The obtained results
were verified for each testing process. The composites exhibited good
mechanical and nanomechanical properties with outstanding tensile performance. Excellent
physical and technical properties with extremely minor moisture content, water absorption, and
thickness swelling were confirmed. More importantly, the composites possessed outstanding
prolonged-testing results, displaying high stability when immersed in water and excellent
thermal properties. They are suitable candidates for outdoor and PV applications. To gain
further insight into the composites’ functional capabilities, they were fabricated as backsheets in
the PV module. Other than the low cost of fabrication and its simplicity, the
composites displayed adequate performance for solar cells such as thermal compatibility, good heat dissipation, durability, hardness, and excellent adaptation
to the module. The developed module was simultaneously evaluated, electrical efficiency and I-V
characteristics were evidenced achieving Pmax range of 19.23 W to 21.04 W and Imaxp range of
1.265 A to 1.394 A. The Vopen was between 19.59 V and 20.24 V. In the proportional analysis
between PVDF-SSPF and the conventional backsheet; the PVDF-SSPF found to be less responsive to
temperature and heat absorbance. The thermal start-end points were reported as (31.1°C, 45.7°C) and
(32.0°C, 50.6°C) in both PVDF-SSPF backsheets and conventional backsheets; respectively. The total
average variation between the two temperatures was 10.53°C. The module with PVDF-SSPF proved
8.54% decline in its temperature with excellent thermal shifts. The temperature shifts verified
the improvement in thermal stability and the reduction in heat absorbance in
PVDF-SSPF backsheet composites. Readings on the module’s performance provided further evidence
of the composites’ high potential for being introduced as a unique solution for PV backsheet
enhancements. Overall, characterization and development analyses were effectively accomplished. The
PVDF-SSPF composites exhibited outstanding properties and can be essentially fabricated as
backsheets where high durability, reliability, efficiency, weather- resistance, dielectric
suitability, thermal stability, as well as optimal balance between such properties can be
maintained. The study recommends that further efforts should be made to examine more relevant
composites or other potential green materials to effectively contribute to the functionality of
renewable energy systems. Additional research efforts should be made to investigate new
opportunities for enhancing the bond between composites and PV solar modules with the use of
suitable adhesives and laminating technologies. This will secure the continuous development,
characterization enhancements, and proper
utilization of these composites
Hierarchical Composite Materials: Materials, Manufacturing, Engineering/ Kaushik Kumar, J. Paulo Davim.
No full textIn English.Includes bibliographical references and index.Hierarchical Composite Materials provides an in-depth analysis of a class of advanced composites that have properties that are anisotropic due to structural organization at different length scales. Chapters address how ordering occurs from the atomic-scale up to the microstructure and how control of these factors leads to the final materials' properties. Manufacturing procedures, properties, and applications of different functionally graded materials are discussed in detail. This book is ideal for materials scientists, mechanical engineers, chemists and physicists.Zindani, Divya / Kumar, Kaushik / Davim, J. Paulo -- Abdulrahman, Kamardeen O. / Akinlabi, Esther T. / Mahamood, Rasheedat M. -- Mahamood, R. M. / Akinlabi, E. T. / Owolabi, G. M. / Abdulrahman, K. O. -- Alaaeddin, M. H. / Sapuan, S. M. / Yusoff, M. Z. M. / Zainudin, E. S. / Al-Oqla, Faris M. -- Subramaniam, Savita K. / Gaba, Vivek Kumar / Bhowmick, Shubhankar -- Hien, Ta Duy -- Karsh, P. K. / Mukhopadhyay, T. / Dey, S. -- Singh, Akant Kumar / Siddhartha / Singh, Prashant Kumar -- Sondhi, Lakshman / Sanyal, Subhashis / Saha, Kashinath / Bhowmick, Shubhankar -- Frontmatter -- Preface -- Contents -- List of Contributing Authors -- Editors’ Biography -- 1. Fabrication of functionally graded materials: A review / 2. Manufacturing of aluminium composite materials: A review / 3. Advanced manufacturing of compositionally graded composite materials: An overview / 5. Natural fiber composites as functionally graded materials for advanced applications / 6. Temperature distribution in functionally graded longitudinal fins of varying geometry / 7. Analytic approach for transient response of functionally graded rectangular plates including the higher-order shear deformation effects / 8. Fuzzy-based frequency response function analysis of functionally graded plates / 9. Transmission efficiency of glass fiber-filled functionally graded material-based PA66 composite spur gears / 10. Approximate solution of functionally graded thick cylinders / Index1 online resource (188 p.
Development of photovoltaic module with fabricated and evaluated novel backsheet-based biocomposite materials
No full textPhotovoltaic backsheets have considerable impact on the collective performance of solar cells. Material components should withstand certain temperatures and loads while maintaining high thermal stability under various weather conditions. Solar modules must demonstrate increased reliability, adequate performance, safety, and durability throughout the course of their lifetime. This work presents a novel solar module. The module consists of an innovative polyvinylidene fluoride-short sugar palm fiber (PVDF-SSPF) composite backsheet within its structure. It was electrically and thermally evaluated. The current-voltage characteristics (I-V) were obtained using the solar module analyzer, PROVA 210PV. A thermal evaluation was accomplished using a temperature device, SDL200. The thermal test consisted of two different assessments. The first targeted the surface and backsheet of the developed module to correlate their performance from within. The second assessment compared the thermal performance of the fabricated backsheet with the conventional one. Both tests were combined into a heatmap analysis to further understand the thermal performance. Results revealed that the developed module exhibited reasonable electrical efficiency, achieving appropriate and balanced I-V curves. PVDF-SSPF backsheets proved to be thermally stable by displaying less heat absorbance and better temperature shifts. Additional research efforts are highly encouraged to investigate other characteristics. To enhance performance, further analyses are needed such as the damp heat analysis, accelerated aging analysis, and heat dissipation phenomena
Photovoltaic applications: status and manufacturing prospects
No full textOver the last two decades, advancements in photovoltaic (PV) technology have been flourishing due to the continuous flow of valuable findings. Relevant insights on recent improvements, manufacturing approaches, and various applications of PV technology are provided. Both the PV cell structure and conversion efficiency may significantly contribute to the progression of the PV system. Currently, a wide range of advanced materials and smart technologies are employed within the PV cell's architecture, improving its structure; i.e. PERC/PERL, IBC, HIT/HJT, and MWT. The applications of nanoparticles and thin film technology in PV cell structures have successfully opened new research prospects to boost PV efficiency and overcome certain limitations with the use of CdSe, ZnCds, CdTe, a-Si/µc-Si, CIS, and CIGS. Additionally, constant development in the third generation of OSC methods using OE, OM, and COP are conducted. The improvement of PV backsheet structures and their enhanced optical properties yielded promising results in optimizing solar radiation, reflectance, and PV cell competence. The emergence of hybrid technologies (e.g. PVTE and TPV systems) led to effective solutions for reducing excessive heat that cause deficiency to a PV cell's functionality. Overall, modelling and effectively implementing appropriate parameters (such as diode parameters, optical parameters, circuit current, circuit voltage, fill factor (FF), conversion efficiency, IR, and UV spectral parameters) contributed to the total efficiency and performance modelling of the PV system
Polymer matrix materials selection for short sugar palm composites using integrated multi criteria evaluation method
No full textThis work introduces a novel model for prioritizing and evaluating polymer matrix materials using integrated multi-criteria evaluation method. The selection process determines the most suitable polymer for incorporating into short sugar palm fiber composites. The prioritization procedure is accomplished using three different selection methods: AHP, TOPSIS, and ELECTRE. AHP is used for prioritizing alternatives. TOPSIS and ELECTRE attain the ranking analysis of alternatives on different scales. A novel tripartite analysis is developed as a new integrative approach for ranking the three selection methods. The analysis supports relevant comparisons and determines the correlations between prioritized alternatives and main criteria
Lightweight and durable PVDF–SSPF composites for photovoltaics backsheet applications: thermal, optical and technical properties
No full textPhotovoltaic module backsheets are characterized according to their thermal, optical, mechanical, and technical properties. This work introduces new fabricated backsheets for PV modules using polyvinylidene fluoride (PVDF) reinforced with short sugar palm fiber (SSPF) composites. The preparation of composites undergoes multiple phases of fabrication. Thermal, optical, and technical investigations of their properties were conducted. Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, in-situ scanning probe microscopy (SPM), dynamic mechanical analysis (DMA), thermal mechanical analysis (TMA), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and prolonged technical testing were accomplished to expansively understand the complex behavior of composites under various conditions. The optical properties of PV backsheets are critical components in determining the reflectance, absorbance, and transmittance of light. The PVDF–SSPF composites exhibited exceptional compatibility and thermal stability, further revealing a homogenous composite structure with enhanced interfacial bonding between the short fiber and polymer matrix
Implementation of the Lisamalex Mobile Application as a Strategy for Strengthening the Lexical Competence in English of Sixth Grade Students
No full textDigitalEl presente proyecto de investigación fue desarrollado con el objetivo de fortalecer la
competencia léxica del idioma inglés en los estudiantes del grado sexto de la Institución
Educativa Liceo Samario. La razón que conllevó a desarrollar este trabajo investigativo surge de
la escasez de vocabulario que presentan los estudiantes al llegar al grado sexto, lo que hace
que su competencia léxica sea pobre al momento de organizar una idea tanto oral como escrita,
es por ello que se hace imprescindible para el docente de idiomas generar nuevos entornos de
aprendizaje donde el estudiante descubra la necesidad y los beneficios de usar un lenguaje
internacional como el inglés.
La metodología aplicada se abordó desde un enfoque mixto de tipo descriptivo, donde
los instrumentos que se diseñaron para la recolección de los datos fueron; prueba diagnóstica
pretest, prueba postest, encuesta de satisfacción, diario de campo y rubricas los cuales
permitieron valorar la efectividad de la variable dependiente de la competencia del área de
inglés mientras que la variable independiente se fundamentó en evaluar el progreso de la
estrategia pedagógica de la implementación de una aplicación móvil. En efecto, la app
LiSamaLEX fue bien acogida por parte de los estudiantes dejando resultados positivos que
permitieron mejorar su competencia léxica y desempeño académico; por lo tanto, crear
aplicaciones móviles para la enseñanza del idioma inglés son en una herramienta útil porque el
educando se convierte proactivo y autodidacta en su propio aprendizaje.The present research project was developed with the objective of strengthening the lexical
competence of the English language in sixth grade students of the Educational Institution Liceo
Samario. The reason that led the development of this investigative work arises from the lack of
vocabulary that students have when they reach sixth grade, which means that their lexical
competence is poor when organizing an idea, both oral and written; which is why it is essential
for the English language teacher to generate new learning environments where the student
discovers the need and benefits of using an international language like English.
The applied methodology was a mixed descriptive approach where the instruments
designed for data collection were; pretest or diagnostic test, postest and satisfaction survey,
another one was the field diary and rubrics which allowed assessing the effectiveness of the
dependent variable of the competence of the English area while the independent variable was
based on evaluating the progress of the pedagogical strategy of the implementation of a mobile
application. Indeed, the LiSamaLEX app was well received by the students, leaving positive
results that allowed them to improve their lexical competence and academic performance;
therefore, creating mobile applications for teaching English language are a useful tool because
the learner becomes proactive and self-taught in their own learning.Introducción ................................................................................................................................ 27
Capítulo 1. Presentación del Trabajo de Grado.......................................................................... 30
Planteamiento del Problema........................................................................................................30
Descripción de la Situación Problema .........................................................................................36
Identificación del Problema..........................................................................................................37
Pregunta Problema......................................................................................................................38
Justificación ................................................................................................................................39
Objetivos….. ............................................................................................................................... 42
Objetivo General..........................................................................................................................42
Objetivos Específicos...................................................................................................................43
Capítulo 2. Bases Teóricas......................................................................................................... 44
Aportes al Estado del Arte ...........................................................................................................44
Marco Teórico..............................................................................................................................63
Marco Conceptual........................................................................................................................67
Aplicación móvil ...........................................................................................................................71
Capítulo 3. Diseño Metodológico................................................................................................ 74
Tipo de Investigación...................................................................................................................74
Alcance…… ................................................................................................................................74
Hipótesis….. ................................................................................................................................76
Variables o Categorías ................................................................................................................76
Población y Muestra ....................................................................................................................78
Procedimiento..............................................................................................................................79
Fase 1. Diagnóstico .....................................................................................................................79
Fase 2. Diseño.............................................................................................................................79
Fase 3. Implementación...............................................................................................................80
Fase 4. Evaluación. .....................................................................................................................80
Instrumentos de Recolección de Información..............................................................................81
Pretest o evaluación diagnóstica de la competencia léxica en inglés .........................................81
Postest.........……………………………………………………………………………………………. 82
Diario de campo...........................................................................................................................83
Encuesta de satisfacción .............................................................................................................83
Técnicas de Análisis de Datos.....................................................................................................84
Capítulo 4. Consideraciones Éticas............................................................................................ 85
Capítulo 5. Diagnóstico............................................................................................................... 87
Aplicación evaluación diagnóstica pretest. ..................................................................................87
Capítulo 6. Estructura de la Propuesta de Intervención ........................................................... 104
Propuesta Pedagógica...............................................................................................................104
Componente Tecnológico..........................................................................................................136
Aplicación móvil .........................................................................................................................136
App inventor. .............................................................................................................................136
Estructura de LiSamaLEX App. .................................................................................................138
Manual de usuario .....................................................................................................................143
Implementación..........................................................................................................................149
Capítulo 7. Análisis e Interpretación de Datos.......................................................................... 155
Análisis de contraste..................................................................................................................155
Análisis Cualitativo de los Resultados de Diarios de Campo ....................................................179
Análisis diario de campo 1.........................................................................................................179
Análisis diario de Campo 2 ........................................................................................................180
Análisis diario de Campo 3 ........................................................................................................181
Análisis diario de Campo 4 ........................................................................................................182
Encuesta de satisfacción ...........................................................................................................183
Capítulo 8. Conclusiones.......................................................................................................... 192
Capítulo 9. Limitaciones............................................................................................................ 195
Capítulo 10. Impacto, Recomendaciones y Trabajos Futuros.................................................. 197
Impacto…… ..............................................................................................................................197
Recomendaciones y Trabajos Futuros ......................................................................................197
Referencias Bibliográficas ........................................................................................................ 199
Apéndices ................................................................................................................................. 209MaestríaMagíster en Tecnologías Digitales Aplicadas a la Educació
