bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Acoustic Performance of Natural Composites in Reducing Stress Levels: Textile Industry
Authors: Widjanarti Maria P. , Probandari Ari , Sumardiyono . , Sunarto . 
Published: July 2023

The porous characteristics of recycled natural fibres make them suitable for use as acoustic materials. Straw and water hyacinth fibres are natural materials that can potentially be used as composites in damping devices. This study evaluated the acoustic performance of two types of reinforced composites containing natural fibers (water hyacinth and rice straw) and gypsum adhesives in reducing stress levels in the textile industry. The evaluation was carried out through laboratory tests using impedance tubes and direct testing in a textile factory to reduce the stress level of production machine workers and operators. Rice straw and water hyacinth fibres were thoroughly mixed in proven mass ratios of 10% and 30% with water and gypsum plaster as a binder. The mixture was pressed into a mould at a pressure of 3 MPa before being heated in an oven at 900ºC for 5 hours. Perforations measuring 4 to 8 mm in diameter were then made at equal distances on the panels. Acoustic panel performance tests were carried out with impedance tubes according to ISO 10534-2 standards at sound frequencies ranging from 0 to 6400 Hz. Field tests were also conducted at a textile factory, with each machine unit generating a sound source of 100 to 110 dB. Heart rate data was collected, and noise measurements were carried out before and after the panels were installed in the area around the operating machines. The results showed that the rice straw-gypsum composite with four perforations performed the best, achieving an α coefficient of 1.0 at a frequency of 1500 Hz and an NRC of 0.50, indicating effective noise reduction. The installation of acoustic panels around the noise source in the textile industry reduced noise levels by up to 9.8 dB and was found to affect workers' heart rates, indicating reduced stress levels. The questionnaire results also showed a significant effect on the stress levels of workers. The use of natural fibers in composite materials has the potential to be an eco-friendly and sustainable solution for soundproofing applications. Doi: 10.28991/CEJ-2023-09-06-02 Full Text: PDF
Prediction of Soil-Water Characteristic Curves of Four Subgrade Materials using a Modified Perera Model
Authors: Gueye Rokhaya , Ba Makhaly , Mbaye Ibrahima , Ki Ida Bibalo Josiane 
Published: July 2023

One of the main hydraulic properties of unsaturated soils is the Soil-Water Characteristic Curve (SWCC). It is essential to understand, predict soil water storage and determine the hydraulic and mechanical behaviour of soils. These curves can be obtained by direct and indirect measurements. The measurements to obtain these curves are expensive, delicate to perform and can be really slow for fine soils, so predictive models become necessary. In order to make a numerical model, a couple of identification tests were carried out to obtain the physical properties of each sample among the four subgrade materials collected in the regions of Dakar and Thies (Senegal). The measurement tests of the matric suction were then conducted depending on the nature of the material (fine-grained soil or coarse-grained soil) and allowed to draw the SWCC of each soil. Among numerous predictive models developed for SWCC in the last decades; this study used the Perera model to fit the SWCC of four (04) subgrade materials, which did not give a satisfactory coefficient of correlation (R2 = 58% and a relatively low sum of the squared residuals (SSR)). This leads to modifying the Perera model to better fit the SWCC on the basis of an understanding of the effect of each parameter on the shape of the SWCC. The proposed modified model was validated by checking the adjusted R2, minimizing the SSR in order to approach at most the experimental air entry value. The modified model works pretty well on coarse-grained and fine-grained soils. This modified model of Perera provided a very good correlation R2equal to 99.98, 98.74, 99.64, and 99.73 for the sandy soils (Sebikotane and Keur Mory) and the Marley and Clayey soils of Diamniadio, with a minimal SSR obtained compared to Perera’s and Hernandez model. Doi: 10.28991/CEJ-2023-09-06-03 Full Text: PDF
Experimental Study on Ultimate Strength of Steel Tube Column Filled with Reactive Powder Concrete
Authors: Al-Abbas Bahaa , Abdul Rasoul Zainab M.R. , Hasan Dhafer , Rasheed Sajjad E. 
Published: July 2023

Composite concrete Filled Tubular Steel (CFT) members, which have excellent deformability due to the well-known confined and constrained interaction between steel tube and concrete, have largely been utilized as bridge piers or columns in high-rise buildings, resulting in increased strength and decreased column size. This study examined the experimental performance of steel tube columns filled with reactive powder concrete (RPC) under axial compression. Three sets of columns were used in the experiment, each with variations in shape (square, rectangular, and circular), length-to-diameter ratio, and compressive strength of the RPC. The first set consisted of five columns, while the second and third sets each had seven columns with three different lengths (750 mm, 600 mm, and 450 mm) and two different compressive strengths (54 and 92 MPa). A new numerical model was developed to calculate the ultimate failure load of the columns by considering factors such as the yield strength of steel, the compressive strength of concrete, the column shape, and the ratio of concrete to steel. This model was validated by comparing the results obtained from the experiments to those predicted by the model, as well as by designing equations from various codes. The results showed that the proposed numerical model accurately predicted the ultimate failure load for columns filled with different types of concrete, especially for RPC, while maintaining conservatism compared to the ACI, AISC, and EN codes equations. Doi: 10.28991/CEJ-2023-09-06-04 Full Text: PDF
Behavior of Centrifuged GFRP Poles Under Lateral Deflection
Authors: Awad Youssef A. , EL-Fiky Ahmed M. , Elhegazy Hosam M. , Hasan Mahmoud G. , Yousef Ibrahim A. , Ebid Ahmed M. , Khalaf Mohamed A. 
Published: July 2023

Centrifugal-manufactured GFRP pipes are widely used today as lighting and low-power transmission poles due to their lightweight, high electrical insulation, low cost, and corrosion resistance. Despite these advantages, GFRP poles suffer high deflection problems due to their low elastic and shear moduli values. In order to overcome this disadvantage, three techniques were suggested to control the lateral deflection of the GFRP poles: an extended internal steel stub, external steel angles, and internal steel bracing bars. The main objective of this study is to determine the optimum strengthening technique to improve the serviceability of GFRP poles in terms of lateral deflection according to ASTM D4923. An experimental research program containing five full-scale GFRP poles was carried out to determine the optimum strengthening technique and the effect of connectors opening near the base and compare it to previous research. The results indicated that flexural stiffness was increased by 44%, 66%, and 38% for the extended stub, steel angles, and bracing bars, respectively. Besides that, the reduction in flexural stiffness due to connector opening was about 8%. The measured deflections showed good matching with simplified mathematical calculations, and the division was about ±10%. The external steel angle technique showed the best efficiency in Stiffness behavior. Doi: 10.28991/CEJ-2023-09-06-07 Full Text: PDF
Estimation of Soil Moisture for Different Crops Using SAR Polarimetric Data
Authors: Kanmani K. , P. Vasanthi , Pari Packirisamy , Ahamed N. S. Shafeer 
Published: July 2023

Soil moisture is an essential factor that influences agricultural productivity and hydrological processes. Soil moisture estimation using field detection methods takes time and is challenging. However, using Remote Sensing (RS) and Geographic Information System (GIS) technology, soil moisture parameters become easier to detect. In microwave remote sensing, synthetic aperture radar (SAR) data helps to retrieve soil moisture from more considerable depths because of its high penetration capability and the illumination power of its light source. This study aims to process the SAR Sentinel-1A data and estimate soil moisture using the Water Cloud Model (WCM). Many physical and empirical models have been developed to determine soil moisture from microwave remote sensing platforms. However, the Water Cloud Model gives more accurate results. In this study, the WCM model is used for mixed crop types. The experimental soil moisture was determined from in-situ soil samples collected from various agricultural areas. The soil backscattering values corresponding to the different soil sampling locations were derived from Sentinel SAR data. Using linear regression analysis, the laboratory's soil moisture results and soil backscattering values were correlated to arrive at a model. The model was validated using a secondary set of in-situ moisture content values taken during the same period. The R2 and RMSE of the model were observed to be 0.825 and 0.0274, respectively, proving a strong correlation between the experimental soil moisture and satellite-derived soil moisture for mixed crop field types. This paper explains the methodology for arriving at a model for soil moisture estimation. This model helps to recommend suitable crop types in large, complex areas based on predicted moisture content. Doi: 10.28991/CEJ-2023-09-06-08 Full Text: PDF
The Effect of Recycled Material and Buton Granular Asphalt (BGA) on Asphalt Concrete Mixture Performance
Authors: Pradani Novita , Irmawaty Rita , Tjaronge Muhammad W. , Rahim Irwan R. 
Published: July 2023

Pavement recycling is an appropriate technology for constructing and restoring road pavement structures due to the limited supply and high cost of pavement materials. This study aims to improve the recycled mix's performance by replacing the fine aggregate in the recycled mix for road pavement with Buton Granular Asphalt (BGA). The percentage of recycled material (Reclaimed Asphalt Pavement/RAP) in the mixture was limited to 20% and 30% by weight of the total mixture. BGA was added by 3%, 6%, and 9% in each mixture with the RAP variation. Mixture performance was obtained through Indirect Tensile Strength (ITS) testing. The ITS test results showed that the ITS value of the mixture with RAP and BGA increased by an average of 4.7–15% compared to the mixture without RAP and BGA. The Toughness Index (TI) value increased by 3.5–19.8% with the addition of RAP. With the addition of 3% BGA, the TI value tends to increase and subsequently decrease up to 9% BGA levels. The result indicated that adding 30% RAP and 3% BGA to the mixtures improved pavement performance and could be a solution to increase the elasticity and fracture resistance of the mixture. Doi: 10.28991/CEJ-2023-09-06-09 Full Text: PDF
Factores que influyen en el incremento del precio de la renta de departamentos en Monterrey, Nuevo León.
Authors: Cruz Lara Carlos , Ramírez Garza Martha María 
Published: July 2023

El objetivo de esta investigación es conocer los factores que influyen en el incremento del precio de renta de departamentos en Monterrey, en el estado de Nuevo León debido, principalmente, al COVID-19. La información recabada para este estudio proviene de un censo del periódico El Norte, debido a que es una fuente muy solicitada por las personas de esta ciudad y, además, tiene un gran impacto en las publicaciones de avisos de ocasión del fenómeno de estudio que nos ocupa. El periodo de estudio corresponde al año 2021. El análisis que se lleva a cabo es descriptivo con la finalidad de conocer las características hedónicas de los departamentos que son más solicitados en la ciudad. Entre los principales resultados se encuentra que el costo de la renta depende de la cantidad de áreas, y rondan desde los siete mil pesos para un departamento con una recámara y un baño, hasta los 11,500 pesos para uno con tres recámaras y dos baños.
Estudio de factibilidad para la implementación una fábrica productora de mermeladas con identidad amazónica
Authors: Ayala Pasquel Sara Nathaly , Arteaga Remache Evelyn Rosalía , Piruch Nantip Jesica Diana 
Published: July 2023

La presente investigación desarrolla un modelo de estudio que establece la factibilidad de implementar una fábrica productora de mermeladas, cuya materia prima se extrae de productos de la Amazonía ecuatoriana, en el cantón Morona, Provincia de Morona Santiago en Ecuador, lugar en donde se pretende ubicar la planta de producción. Para cumplir con el objetivo se desarrolló el estudio de mercado, estudio de técnico, estudio económico y financiero. El diseño de la investigación es cuantitativa y cualitativo, de tipo exploratorio – explicativa, de diseño no experimental, la técnica de investigación para recopilar los datos es bibliográfica y de campo a través de la aplicación de 114 encuestas dirigidas a jefes de hogar que gustan del consumo de este producto suntuario, obteniendo datos referentes a gustos y preferencias de los consumidores proyectando así la demanda esperada; a través de la metodología presupuestal se determinó el monto de inversión, los ingresos estimados, los costos y gastos incurridos, se elaboraron estados financieros proyectados para 5 años. El resultado presenta un modelo guía de la implementación de una idea de negocio, con el fin de que el emprendedor deje atrás procesos empíricos al emprender, permite resaltar la importancia de estudiar al consumidor de manera previa en cuanto a sus gustos y preferencias, cuantifica y proyecta resultados estimados. Finalizado el estudio se determina la factibilidad de implementar la fábrica a la que se denomina “Dulce-Sabor”, a través de la aplicación y análisis de índices financieros como son el VAN y la TIR.
El reto de la Educación Superior, vinculada a las TIC´s, para la sociedad del conocimiento.
Authors: Laines Alamina Cristina Isabel , Silva Almanza Ivonne Janette 
Published: July 2023

La disrupción del entorno global, post pandemia por COVID-19, ha llevado a las instituciones de Educación Superior a afrontar nuevos retos, donde la digitalización y el uso de nuevas tecnologías jugaron un papel fundamental para su permanencia y adaptación a esos nuevos escenarios. Se evidencio la constante necesidad de la colaboración en todos los niveles, instituciones, gobierno, docentes y estudiantes, de desarrollar y adquirir habilidades para sobrellevar, estos nuevos retos. De ahí se realizó una recopilación teórica de diversos autores, que convergen entorno, a este estudio.
Elementos que influyen en el posicionamiento de mercado de las microempresas comerciales
Authors: Pinzón Prado Leidy Tatiana , Morquecho Salto Julio César 
Published: July 2023

Las microempresas han alcanzado a ofrecer los productos a sus clientes, sin embargo, en la actualidad, no han logrado sostenerse en el mercado, por la falta de estrategias que permitan fortalecer sus actividades, y, por ende, fracasan. Tomando en cuenta que la mente y el comportamiento del consumidor suele ser cambiante ya que cada día nacen nuevos productos, nuevas opciones y otras salen del mercado. La presente investigación busca dotar de elementos estratégicos como servicio al cliente, precios competitivos, calidad del producto y una eficiente distribución a las microempresas para que su posicionamiento sea efectivo; en cuanto a la técnica utilizada, se realizó una investigación descriptiva documental partiendo de lo que varios autores ya han revisado, distintos textos, artículos, y fuentes electrónicas, cabe indicar que la revisión documental se realizó en publicaciones indexadas en diferentes repositorios con publicaciones Q2, entre otros, dando como resultado un total de 32 publicaciones de investigación revisados que cumplen con los criterios de búsqueda señalados en el diseño metodológico planteado en la presente investigación. Los resultados del presente tema de investigación demuestran que, los microempresarios al aplicar factores relevantes, lograrán posesionarse en el mercado y mejorar estratégicamente su negocio frente a la competencia, donde sus productos sean reconocidos por los consumidores. Se concluyó que el posicionamiento y el uso de elementos estratégicos están muy relacionados, por lo tanto, la aplicación de elementos, influyen en el posicionamiento de mercado, logrando un impacto favorable en los sentidos perceptivos del comprador en relación a los competidores.
Perspectiva teórica de la satisfacción de estudiantes de escuelas de negocios de universidades privadas
Authors: Mauricio Salas Mariela del Pilar , Galindo Mora Patricio , Blanco Jiménez Mónica 
Published: July 2023

En base a la revisión sistemática y profunda de la literatura, el objetivo del presente estudio es determinar los factores que promueven la satisfacción de los estudiantes de escuelas de negocio, evidenciando la importancia de atender esta problemática por las serias consecuencias que genera la insatisfacción del alumnado. Como metodología se aplicó un diseño exploratorio (cualitativo) mediante el cual se desarrolló una sistemática revisión bibliográfica documental. Asimismo, se llevó a cabo un diseño explicativo porque se describe cada una de las variables del estudio desde una perspectiva teórica, presentado evidencias empíricas encontradas en estudios indizados en Scopus, Web of Science disponibles en Google Académico, EbscoHost y Proquest. La hipótesis declara que la calidad de la enseñanza, el plan de estudios, los servicios académicos, la infraestructura y la autoeficacia del estudiante tienen una influencia positiva en la satisfacción del estudiante. Los resultados confirman las variables en estudio tienen una influencia positiva en la satisfacción del estudiante.
Palabras clave: satisfacción del estudiante, plan de estudios, servicios administrativos, infraestructura, autoeficacia del estudiante.
PELATIHAN PERENCANAAN DAN PEMASANGAN INSTALASI LISTRIK YANG AMAN BERDASARKAN PUIL 2011 (SNI 0225:2011) UNTUK BANGUNAN BAGI MASYARAKAT DESA JELANTIK, KECAMATAN JONGGAT, KABUPATEN LOMBOK TENGAH
Authors: Sultan Sultan , Sasongko Sudi Mariyanto Al , Ari Nrartha I Made , Kanata Bulkis , Ginarsa I Made , Mulyono Agung Budi 
Published: July 2023

Desa Jelantik merupakan salah satu desa dari 13 desa yang ada dikecamatan Jonggat, Kabupaten Lombok Tengah berpenduduk 10.393 Jiwa. Masyarakat desa Jelantik berpendidikan masih rendah yaitu sebagian besar hanya tamat SD, SMP dan SMA, dan mereka tidak memiliki keterampilan untuk mendapatkan pebekerjaan, sehingga desa Jelantik dijadikan mitra untuk dilaksanakan pelatihan. Perekonomian masyarakat Desa Jelantik masih tergolong rendah, dengan mata pencaharian mereka adalah sebagai petani dan buruh tani.
Melalui kegiatan pengabdian kepada masyarakat, Akademisi dari Univesitas Mataram memberikan pelatihan bidang kelistrikan kepada masyarakat Desa Jelantik khususnya pemuda putus sekolah, sehingga dengan bekal keterampilan yang diperoleh dari pelatihan tersebut mereka memperoleh kesempatan atau peluang untuk mendapatkan pekerjaan dan penghasilan terutama untuk diri sendiri.
Kegiatan pelatihan perencanaan dan pemasangan instalasi listrik untuk bangunan yang telah dilaksanakan di Desa Jelantik, Kecamatan Jonggat, Kabupaten Lombok Tengah, hampir 100% peserta merasakan manfaat dan menginginkan pelatihan kembali yang dilaksanakan secara periodik. Demikian pula setelah mengikuti pelatihan, sebanyak 77% peserta menyatakan instalasi rumah mereka tidak aman (tidak memenuhi standar menurut SNI-PUIL 2011).
Pengembangan Media Powtoon Berbasis Model Problem Based Learning Untuk Meningkatkan Penguasaan Konsep Fisika Peserta Didik
Authors: Hidayah Nurmala , Zuhdi Muhammad , Taufik Muhammad , Harjono Ahmad 
Published: July 2023

The purpose of this study is to determine the validity of developing powtoon media based on problem based learning model to increase understanding of student physics concept. The research design used research and development (R&D) by Thiagarajan with 4d model (define, design, develop, and disseminate). This study is limited only to validity tests by taking the result of expertand practitioner validators and the results of questionnaire responses from students are not conducted limited trials. Limited trials are not conducted due to limitations of time and civility. The validity of powtoon media based on problem based learning model is analyzed using SBi (Ideal Standard Deviation).
Rancang Bangun Alat Pengukur Kecepatan Suara Pada Zat Padat Menggunakan Sensor Piezoelectric Untuk Praktikum Fisika Dasar Topik Cepat Rambat Bunyi
Authors: Habiburrohman Agus Wahid , Fauzi Fauzi 
Published: July 2023

Penelitian kali ini bertujuan untuk membuat alat ukur kecepatan bunyi dan menentukan cepat rambat bunyi melalui medium zat padat menggunakan sensor piezoelctric. Adapun medium uji zat padat yang digunakanadalah batang logam tipis dari tiga jenis bahan yang berbeda. Batang uji sepanjang 6 m terbuat dari aluminium, besi dan tembaga. Proses pengujian dilakukan dengan membentuk batang uji menjadi kumparan yang digulung di atas gabus yang berfungsi untuk meredam getaran dan gelombang bunyi. Hal ini dilakukan dengan asumsi bahwa gelombang bunyi hanya akan meambat melalui medium batang logam. Kumparan dihubungkan dengan plat besi pada salah satu ujungnya, kemudian dipukul dengan palu sebagai sumber bunyi. Ketika palu dipukul ke plat besi secara otomatis perhitungan waktu penjalaran gelombang dimulai kemudian waktu akan berhenti ketika sudah mencapai ujung yang lain yang telah terhubung dengan sensor piezoelctric, sehingga didapat waktu waktu penjalaran gelombang pada zat padat. Kemudian dihitung nilai cepat rambat gelombang bunyi pada medium zat padat tersebut. Hasil perhitungan kecepatan yang didapat akan dibandingkan dengan dengan nilai kecepatan refrensi dan dihitung persentase errornya.
The Effectiveness of Android-Based Physics Learning Media Assisted by Smart Apps Creator to Improve Learning Outcomes
Authors: Watin Wisnu , Wayan Gunada I , Fauzia Husrin , Ayub Syahrial 
Published: July 2023

The aim of the research is to develop physics-based learning media based on Android with the help of smart app creators on mechanical wave material. Tests were conducted to determine the effectiveness of the media to improve student learning outcomes. This study uses the Research and Development (R&D) development research method. The research subjects were 22 students of SMAN 1 Gunungsari class XI IPA1. The results obtained were an average pre-test score of 43.33 and a post-test score of 72.50, with an average N-gain of 0.52 which qualified in the medium category. This shows that the Android-based physics learning media assisted by smart app creators is effective in improving student learning outcomes in mechanical wave material.

Keywords: physics learning media, smart apps creator, learning outcomes.