Claim Missing Document
Check
Articles

Found 5 Documents
Search

PENGARUH FRAKSI VOLUME SERAT KOMPOSIT HYBRID BERPENGUAT SERAT BAMBU ANYAM DAN SERAT E-GLASS ACAK BERMATRIK EPOXY TERHADAP KEKUATAN BENDING SUBEKTI, FAJAR; ARIF IRFAI, MOCHAMAD
Jurnal Teknik Mesin Vol 6, No 2 (2018)
Publisher : Jurnal Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstrak Kerusakan pada pipa air yang terbuat dari logam pada banyak kasus terjadi karena terjadinya korosi dan beban yang terjadi pada pipa karena massa pipa itu sendiri maupun faktor dari luar. Material sebagai bahan pembuat pipa air yang tahan terhadap korosi dan memiliki sifat mekanis yang baik diperlukan sebagai bahan alternatif pembuatan pipa air. Komposit merupakan alternatif material yang dapat digunakan sebagai bahan pembuat pipa air karena memiliki sifat tahan korosi dan sifat mekanik yang baik. Jenis komposit hybrid dapat digunakan sebagai bahan alternatif pembuat pipa karena memiliki ketahanan terhadap korosi dan sifat mekanik yang baik. Penelitian ini bertujuan untuk mengetahui pengaruh fraksi volume serat komposit hybrid berpenguat serat bambu anyam dan serat E-glass acak bermatrik epoxy terhadap kekuatan bending. Dengan perbandingan serat bambu dan serat E-glass sama. Variasi fraksi volume serat komposit hybrid 20%, 30%, 40% ,50%, dan 60%. Kemudian dibuat sampel komposit hybrid. Pengujian yang dilakukan adalah pengujian bending untuk mengetahui kekuatan bending komposit hybrid. Pengujian bending dilakukan pada alat uji Universal Testing Machine (UTM) dengan standar pengujian bending ASTM D 7264. Hasil penelitian menunjukkan bahwa komposit hybrid berpenguat serat bambu anyam dan serat E-glass acak bermatrik epoxy menunjukkan kecenderungan peningkatan kekuatan seiring dengan peningkaran fraksi volume serat dan kekuatan yang optimal pada fraksi volume serat 60% dengan nilai kekuatan bending 62,051 MPa. Pengamatan secara makroskopis menunjukkan fibre pullout yang sedikit dan merata pada bidang patahan serat E-Glass dan serat bambu. Kata kunci: Komposit Hybrid, Serat E-glass, Serat Bambu, Fraksi Volume , Kekuatan Bending. Abstract Damage to water pipes made of metal in many cases occurs due to corrosion and the load that occurs on the pipe due to the mass of the pipe itself and external factors. Material as a material for making water pipes that are resistant to corrosion and has good mechanical properties is needed as an alternative material for making water pipes. Composite is an alternative material that can be used as a water pipe maker because it has corrosion resistance properties and good mechanical properties. Hybrid composite types can be used as alternative pipe makers because they have corrosion resistance and good mechanical properties. This study aims to determine the effect of hybrid composite fiber volume fraction with woven bamboo fiber and random E-glass fiber with epoxy matrix on bending strength. With the comparison of bamboo fiber and E-glass fiber the same. Variation of hybrid composite fiber volume fraction 20%, 30%, 40%, 50%, and 60%. Then a hybrid composite sample is made. The test is bending testing to determine the bending strength. Bending testing is carried out on Universal Testing Machine (UTM) test equipment with standard ASTM D 7264 bending testing. The results showed that hybrid composites with woven bamboo fiber and random E-glass fiber with epoxy matrix showed a tendency to increase strength along with the increase in fiber volume fraction and optimal strength in 60% fiber volume fraction with 62,051 MPa bending strength. Macroscopic observation shows that the pullout fibers are little and evenly distributed in the fracture fields of E-Glass fibers and bamboo fibers. Keywords: Hybrid Composite, E-Glass Fibre, Bamboo Fibre, Volume Fraction, Bending Strength.
Implementasi Kemala-Smart untuk Meningkatkan Kualitas Layanan Posyandu Indrasari, Widyaningrum; Ariyanti, Shallu Fidhah; Hersaputra, Nugraha; Nuvus, Afiva Riyatun; Dewanti, Kunti; Zulmi, Febrian; Ramdhan, Muhammad Rofiid; Subekti, Fajar; Bahagia, Marthin Virgo; Muliyati, Dewi; Firmansyah, Heri
Bahasa Indonesia Vol 21 No 01 (2024): Sarwahita : Jurnal Pengabdian Kepada Masyarakat
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/sarwahita.211.1

Abstract

Posyandu is one of the social institutions that plays a role in the community participation approach in the health sector. The quality and effectiveness of Posyandu depend on the role of Posyandu cadres. Posyandu cadres of Kemala Bhayangkari still use a manual approach in collecting data on toddler development. Using manual methods creates the potential for data errors, loss of information, and difficulties in accessing data. Through the Community Service Program of 2023, the smart sensing device has been developed using sensors system that is integrated with the Internet of Things (IoT). Furthermore, there is a Posyandu service website containing information about available services and data on the growth and development of toddlers. The success of implementing activities is assessed by participants through a questionnaire. The results achieved from this program show that the quality of the device, website and database system is very good (96%); the system is able to improve the quality of posyandu services, especially in the context of recording and reporting growth and development data at Posyandu Kemala Bhayangkari Ciracas (93%); and the need for posyandu cadres assistance and continuity of activities (93%). Abstrak Posyandu merupakan salah satu pranata sosial yang berperan dalam pendekatan partisipasi masyarakat di bidang kesehatan. Kualitas dan efektivitas Posyandu bergantung pada peran kader Posyandu. Kader Posyandu Kemala Bhayangkari masih menggunakan pendekatan manual dalam pendataan perkembangan balita. Penggunaan metode manual menimbulkan potensi kesalahan data, kehilangan informasi, dan kesulitan dalam mengakses data. Pada Program Pengabdian Kepada Masyarakat Terintegrasi Kuliah Kerja Nyata (PKM-KKN) tahun 2023, telah dikembangkan alat sensor cerdas menggunakan sistem sensor yang terintegrasi dengan Internet of Things (IoT). Selain itu, terdapat situs web layanan Posyandu berisi informasi seputar layanan yang tersedia dan data tumbuh kembang balita. Keberhasilan pelaksanaan kegiatan dinilai oleh peserta melalui kuisioner. Hasil yang dicapai dari program ini menunjukan bahwa kualitas alat, situs web, dan sistem database yang dikembangkan sangat baik (96 %); sistem yang dikembangkan mampu meningkatkan mutu layanan posyandu khususnya dalam rangka pencatatan dan pelaporan data tumbuh kembang di Posyandu Kemala Bhayangkari Ciracas (93 %); dan perlu adanya keberlanjutan kegiatan (93%).
PENGARUH GEOMETRI DAN PENAMBAHAN JUMLAH SIRIP TERHADAP DISTRIBUSI TEMPERATUR HEAT SINK SEBAGAI ALTERNATIF PENDINGINAN PADA PIRANTI ELEKTRONIK Subekti, Fajar; Wahyudi, Slamet; Gapsari, Femiana
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1465

Abstract

This study aims to determine the effect of the geometry shape of the copper material heat sink fins on the surface temperature distribution of the heat sink. The material used in this research is pure copper, the shape of the heat sink fins is made rippled with the addition of the number of fins 5, 6, and 7 and the input temperature is varied from 40 C to 80 C with airflow variations from 0.2 m/s to 1 m/s. The first step is to create a heat sink design with Autodesk Inventor. Then the plan is simulated with Autodesk CFD to solve the continuity, momentum, turbulence, and energy equations. Based on the method that has been carried out, it is found that the addition of variations in the number of fins affects the decrease in surface temperature. The highest temperature drop on fin 5 ripples is 24.1 C. The heat energy transfer rate increased by 0.4657 W. The convection heat transfer coefficient  increased by 3.47 W/m²C. Nusselt number shows an increase of 271. Fin performance has increased efficiency by  63.4 %, and effectiveness by 1.61. The results of this study are expected to provide practical alternatives that can be widely adopted on a heatsink plate that is very promising for future thermal developments.
Analyzing the Impact of Company Location, Size, and Remote Work on Entry-Level Salaries a Linear Regression Study Using Global Salary Data Khosa, Joe; Mashao, Daniel; Subekti, Fajar
International Journal of Informatics and Information Systems Vol 7, No 3: September 2024
Publisher : International Journal of Informatics and Information Systems

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47738/ijiis.v7i3.215

Abstract

This research explores the key factors influencing entry-level salaries in the global labor market of 2024, emphasizing the roles of company location, organizational size, and the extent of remote work in shaping compensation levels. Drawing on the Global Salary 2024 dataset from Kaggle, which comprises over 5,600 observations across multiple industries and geographic regions, the study applies a multiple linear regression model executed in Python via Google Colab to quantitatively examine salary disparities. The results indicate that company location and size significantly affect entry-level earnings, underscoring how regional economic contexts, cost-of-living variations, and organizational capacity continue to drive wage formation. Conversely, the remote work ratio exhibits a negligible and statistically insignificant effect, implying that flexibility in work arrangements has yet to translate into measurable financial value for early-career professionals. Furthermore, introducing job title as a control variable enhances the model’s explanatory power, reaffirming the influence of individual skill specialization and job function in determining compensation outcomes. These findings reinforce human capital theory while extending it by incorporating contextual and organizational dimensions relevant to the digital labor economy. For job seekers, the study offers data-driven insights to guide career decisions and salary expectations across regions, while employers may utilize the results to formulate fair and competitive pay strategies in an increasingly interconnected workforce. Ultimately, this study provides a comprehensive understanding of how structural and individual factors interact to shape entry-level salary dynamics in the modern digital era.
PENGARUH GEOMETRI DAN PENAMBAHAN JUMLAH SIRIP TERHADAP DISTRIBUSI TEMPERATUR HEAT SINK SEBAGAI ALTERNATIF PENDINGINAN PADA PIRANTI ELEKTRONIK Subekti, Fajar; Wahyudi, Slamet; Gapsari, Femiana
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1465

Abstract

This study aims to determine the effect of the geometry shape of the copper material heat sink fins on the surface temperature distribution of the heat sink. The material used in this research is pure copper, the shape of the heat sink fins is made rippled with the addition of the number of fins 5, 6, and 7 and the input temperature is varied from 40 C to 80 C with airflow variations from 0.2 m/s to 1 m/s. The first step is to create a heat sink design with Autodesk Inventor. Then the plan is simulated with Autodesk CFD to solve the continuity, momentum, turbulence, and energy equations. Based on the method that has been carried out, it is found that the addition of variations in the number of fins affects the decrease in surface temperature. The highest temperature drop on fin 5 ripples is 24.1 C. The heat energy transfer rate increased by 0.4657 W. The convection heat transfer coefficient  increased by 3.47 W/m²C. Nusselt number shows an increase of 271. Fin performance has increased efficiency by  63.4 %, and effectiveness by 1.61. The results of this study are expected to provide practical alternatives that can be widely adopted on a heatsink plate that is very promising for future thermal developments.