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All Journal Jurnal Civics: Media Kajian Kewarganegaraan Rotasi Jurnal Bahan Alam Terbarukan Majalah Ilmiah MOMENTUM Jurnal Rekayasa Mesin Jurnal Ilmiah Pendidikan Pancasila dan Kewarganegaraan Mechanical Engineering for Society and Industry Automotive Experiences INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY Advance Sustainable Science, Engineering and Technology (ASSET)
Cionita, Tezara
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A Study on Characteristics of Brake Pad Composite Materials by Varying the Composition of Epoxy, Rice Husk, Al2O3, and Fe2O3 Khafidh, Muhammad; Putera, Finny Pratama; Yotenka, Rahmadi; Fitriyana, Deni Fajar; Widodo, Rahmat Doni; Ismail, Rifky; Irawan, Agustinus Purna; Cionita, Tezara; Siregar, Januar Parlaungan; Ismail, Nur Hidayah
Automotive Experiences Vol 6 No 2 (2023)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.9121

Abstract

The use of composite materials in brake pads is becoming increasingly popular due to their high-performance characteristics, including good thermal stability, high wear resistance, and low noise generation. However, the development of new composite materials that offer even better performance is still an ongoing research area. In this study, the composite was made by hand layup method using epoxy resin as matrix material, with rice husk, Al2O3, and Fe2O3 as reinforcing materials. The composition of the composites was varied by changing the percentage of the reinforcement materials. The composites were then subjected to several characterization tests, including density, hardness, flexural strength, thermal analysis, Scanning Electron Microscopy (SEM), TGA/DSC, and wear testing. The test results showed that additional reinforcement materials to the epoxy resin matrix improved the mechanical properties of the composites. Overall, the study demonstrates that a hand layup method is a viable approach for preparing brake pad composite materials and that the addition of rice husk, Al2O3, and Fe2O3 can improve the mechanical properties of the composites. The best properties produced in this research were found in one of the specimens which used epoxy, rice husk, Al2O3, and Fe2O3 with a composition of 50 wt.%, 20 wt.%, 15 wt.%, and 15 wt.%. However, the addition of rice husk also provides wear resistance and thermal stability. This study contributes to the Sustainable Development Goals (SDGs) by advancing innovation, promoting sustainability, and reducing emissions in automotive industry applications.
Political engagement of Rehobot Christian High School's first-time voters in the 2024 presidential election Karliani, Eli; Ikbal, Asep; Sangalang, Ronald Hadibowo; Tardimanto, Yuyuk; Indrawati, Lala; Cionita, Tezara
Jurnal Civics: Media Kajian Kewarganegaraan Vol. 21 No. 2 (2024)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jc.v21i2.71717

Abstract

This study aims to analyze how the political engagement of novice voters in the 2024 Presidential Election at Rehobot Christian High School Palangka Raya.  The largest data on voters in the 2024 Presidential Election is Generation Z, which is around 74.93%. This study uses a simple survey method on Rehobot Christian High School Palangka Raya students. The location was chosen because Rehobot Christian High School is a new school, and most of its students live in boarding schools but rarely receive political socialisation from the government or other institutions. The questionnaire consists of three aspects, namely knowledge, attitudes and political behaviour in the 2024 presidential election. The study results show that the average knowledge aspect falls into the medium category with a percentage of 46%, which indicates a potential for improvement in students' political knowledge in the 2024 presidential election. Regarding the average attitude of students regarding Political Engagement, which is included in the medium category with a percentage of 62%, there is also room for improvement in cultivating and strengthening attitudes regarding the responsibility to be involved in the presidential election. Meanwhile, from the behavioural aspect, the average student behaviour is in a very low category with a percentage of 43%, indicating a need for improvement in how novice voters actively participate in organisations or communities engaged in election volunteers.
Formulation and Evaluation of Face Moisturizing Cream from Katuk Leaf Extract (Sauropus Androgynus Merr) Siallagan, Johnson; Kano, Christina Paulina; Yabansabra, Yuliana Ruth; Pramesti, Santinia Andiva; Fitriyana, Deni Fajar; Siregar, Januar Parlaungan; Cionita, Tezara; Guterres, Natalino Fonseca Da Silva
Jurnal Bahan Alam Terbarukan Vol 13, No 1 (2024): June 2024 [Nationally Accredited Sinta 2]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v13i1.50297

Abstract

The Katuk plant (Sauropus androgynus L. Merr) is a natural substance with proven efficacy in treating diabetes, obesity, and inflammation. It also possesses antioxidant, lactation-inducing, and antibacterial properties. This study aimed to investigate the impact of varying concentrations of katuk leaf extract on characteristics of the moisturizer cream produced. The study involved extracting katuk leaves using the maceration method for 24 hours, utilizing ethanol as the solvent. The extraction process resulted in a yield of 1.86%. The final yield contains alkaloid chemicals, flavonoids, terpenoids, saponins, and tannins. The formulations employed in this investigation utilized the codes F0, F1, F2, and F3, representing the content of katuk leaf extract at 0%, 2%, 4%, and 6%, respectively. The cream generated exhibited an identifiable aroma of katuk and had a hue ranging from light green to blackish brown, as determined by organoleptic testing. The pH values of specimens F0, F1, F2, and F3 were 7, 7, 7, and 8, respectively. The spread ability measurements for specimens F0, F1, F2, and F3 were 5.3 cm, 5.5 cm, 6 cm, and 6.1 cm, respectively. According to the findings of this investigation, specimens F0, F1, F2, and F3 adhered for 5 seconds, 4 seconds, 4 seconds, and 5 seconds, respectively. The formulation F2 is the most superior product generated in this investigation. This is because this specimen exhibits the highest level of respondent satisfaction compared to the other specimens. This formulation exhibits antioxidant activity with a per cent inhibition of 30.51% and an IC50 value of 84.63 ppm. The face moisturizing cream derived from katuk leaf extract possesses a high antioxidant potency, placing it in the active/strong category.
Pengaruh Fraksi Volume Sekam Padi, Aluminium Oksida dan Besi Oksida Terhadap Sifat Mekanik Kampas Rem dengan Matriks Epoxy Fitriyana, Deni Fajar; Widodo, Rahmat Doni; Kriswanto, Kriswanto; Athoillah, Ahmad; Prasetyo, Ares Yudi; Alrasyid, Mochamad Dzaki; Aripin, Muhammad Bustanul; Dimyati, Saeful; Irawan, Agustinus Purna; Cionita, Tezara; Siregar, Januar Parlaungan
JURNAL ILMIAH MOMENTUM Vol 19, No 2 (2023)
Publisher : Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36499/jim.v19i2.8752

Abstract

Penelitian tentang material alam sebagai pengganti material asbes dalam komposit material gesek kampas rem motor terus mengalami peningkatan. Material dalam kategori biomassa sebagai reinforcement komposit agar mendapatkan karakteristik material yang sesuai standar material gesek kampas rem motor. Penelitian ini bertujuan untuk mengetahui pengaruh fraksi volume sekam padi, aluminium oksida, dan besi oksida terhadap sifat mekanik dari spesimen komposit material gesek kampas rem. Proses pembuatan spesimen menggunakan metode hand lay-up dengan fraksi volume material epoksi (100 wt% dan 50 wt%), sekam padi (0 wt% dan 20 wt%), aluminium oksida (25 wt% dan 15 wt%), dan besi oksida (25 wt% dan 15 wt%). Pada penelitian ini, didapatkan pengaruh fraksi volume sekam padi, aluminium oksida, dan besi oksida terhadap sifat mekanik dari spesimen komposit material gesek kampas rem motor yaitu dapat meningkatkan nilai dari masing-masing hasil pengujian. Sehingga, dapat disimpulkan bahwa penggunaan material epoksi 50 wt%, sekam padi 20 wt%, aluminium oksida 15 wt%, dan besi oksida 15 wt% membuat ikatan antar partikel spesimen komposit material gesek kampas rem motor semakin baik dikarenakan kandungan silikanya yang tinggi. Oleh karena itu, didapatkan spesimen komposit material gesek kampas rem sepeda motor dengan sifat mekanik yang baik sesuai standar SNI nomor 09-0143-1987 dan SAE J661-1997.
Pengembangan E-Book Keindonesiaan Sebagai Resolusi Konflik Intergroup Relation pada Siswa Sekolah Menengah Pertama Karliani, Eli; Triyani, Triyani; Saefulloh, Ahmad; Cionita, Tezara
Jurnal Ilmiah Pendidikan Pancasila dan Kewarganegaraan Vol 9, No 1 (2024): Maret 2024
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um019v9i1p%p

Abstract

Kajian ini bertujuan untuk mengembangkan, menguji kelayakan, serta mengimplementasikan sekaligus merefleksi buku elektronik sebagai resolusi konflik intergroup relation antar siswa. Metode yang digunakan yaitu penelitian pengembangan yang dikemukakan oleh Dick dan Carry dengan tahapan analysis, design, development, implementation, dan evaluation. Produk yang dikembangkan yaitu media pembelajaran berupa buku elektronik keindonesiaan yang layak dijadikan sebagai resolusi konflik intergroup relation antar siswa sekolah menengah pertama. Uji kelayakan produk didasarkan pada hasil validasi ahli materi, ahli media, dan ahli evaluasi yang masing-masing menghasilkan skor sebesar 4,2 dengan kriteria baik. Implementasi buku elektronik keindonesiaan kepada siswa dan guru terlaksana dengan baik karena fitur-fitur yang disajikan sangat mudah untuk dipahami. Hasil refleksi menunjukkan bahwa buku elektronik keindonesiaan dapat memberikan dampak positif bagi siswa khususnya untuk meningkatkan kemampuan berpikir secara kontekstual dalam proses pemecahan masalah.
Analisis Parameter Fisik Filamen Biokomposit PLA PCL HA Hasil Proses Ekstrusi Hidayat, Wahyu; Bayuseno, Athanasius Priharyoto; Ismail, Rifky; Fitriyana, Deni Fajar; Cionita, Tezara; Prawibowo, Hartanto
ROTASI Vol 26, No 4 (2024): VOLUME 26, NOMOR 4, OKTOBER 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.4.27-32

Abstract

Penelitian ini berfokus pada tantangan implan logam yang memerlukan operasi kedua, serta risiko infeksi, peradangan, dan korosi yang mungkin terjadi di dalam tubuh. Untuk mengatasi masalah tersebut, penelitian ini mengembangkan material biokomposit yang terdiri dari PCL (Polycaprolactone), PLA (Polylactic Acid), dan Hidroksiapatit (HA), yang dapat terbiodegradasi secara alami di dalam tubuh. Sistem yang diusulkan mampu meningkatkan kontrol pengguna secara signifikan, serta menjadi fondasi untuk sistem kontrol lengkap dalam pembuatan filamen biodegradable. Hal ini dilakukan dengan mengatur parameter motor untuk mencapai diameter filamen yang konsisten dengan deviasi minimal serta mengontrol laju ekstrusi pada printer guna memperbaiki ketidakstabilan filamen.Penelitian ini juga akan membandingkan filamen yang dihasilkan dengan filamen komersial PLA merek SUNLU. Perbandingan tersebut meliputi evaluasi parameter fisik seperti ukuran diameter hasil ekstrusi, densitas filamen setelah penambahan PCL dan HA, serta apakah penampang filamen membentuk lingkaran sempurna. Hasil dari penelitian ini akan memberikan wawasan lebih dalam tentang kualitas fisik filamen yang dihasilkan.
Effect of sandblasting on the characterization of 95MXC coating layer on 304 stainless steel prepared by the twin wire arc spray (TWAS) coating method Fitriyana, Deni Fajar; Puspitasari, Windy Desti; Irawan, Agustinus Purna; Siregar, Januar Parlaungan; Cionita, Tezara; Guteres, Natalino Fonseca Da Silva; Silva, Mateus De Sousa Da; Jaafar, Jamiluddin
Mechanical Engineering for Society and Industry Vol 4 No 2 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.10898

Abstract

Twin wire arc spraying (TWAS) is a thermal spray process that is widely used in various industries. Nevertheless, the impact of repeated sandblasting on the coating characteristics of FeCrBSiMn coating created using the TWAS technique has not been extensively researched. Therefore, this study aims to investigate the influence of repeated sandblasting on the properties of the FeCrBSiMn coating layer created using the TWAS process. The study used stainless steel 304, 75B, and FeCrBSiMn as the substrate, bond coat, and top coat materials. The substrate materials underwent sandblasting with a repetition of 1, 2, and 3 cycles before the coating procedure. The coating's quality in this study was assessed using surface roughness, thickness, hardness, corrosion rate, bond strength, and SEM (Scanning Electron Microscope) examination. The findings of this investigation indicate that the sandblasting treatment substantially elevates the surface roughness of 304 stainless steel substrates. As the substrate surface becomes rougher, there is an increase in the percentage of porosity and unmelted material, as well as an increase in the thickness of the coating layer. Furthermore, the hardness of the resulting coating layer diminishes. Specimen A exhibited superior qualities in comparison to the other specimens. The coating layer on this specimen has a percentage of unmelted material and porosity, thickness, hardness, and adhesion of 7.122%, 0.125 mm, 1081.6 HV, and 14.5 MPa respectively. This investigation's results indicate that the substrate material's corrosion rate (x 10−6 mmpy) is 3648.6, which is lower than the corrosion rate of specimen A, which is 37.802.
Opportunities and challenges in the sustainable integration of natural fibers and particles in friction materials for eco-friendly brake pads Imran, Al Ichlas; Siregar, Januar Parlaungan; Mat Rejab, Mohd Ruzaimi; Cionita, Tezara; Hadi, Agung Efriyo; Jaafar, Jamiluddin; Fitriyana, Deni Fajar; Dewi, Rozanna
Mechanical Engineering for Society and Industry Vol 4 No 3 (2024): Special Issue on Technology Update 2024
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.12271

Abstract

The high concentration of metallic components in the pad composite improves breaking ability at elevated temperatures and frequencies, bolstering the automobile's braking system. The brake pad operates through friction mechanisms, generating PM 10 and PM 2.5 particulate matter that is emitted into the atmosphere, adversely affecting the well-being of humans and animals. Therefore, eco-friendly materials like natural fiber and organic particles are being used as substitutes for the metal in brake pads. However, natural fibers and particles exhibit unique characteristics when interacting with other materials, presenting significant challenges in brake pad composites such as variations in physical properties, limited thermal resistance, and potential degradation at high temperatures and humid environments. These aspects play a crucial role and can affect the structural strength, wear resistance, and overall performance of composite brake pads, especially when operating under extreme braking conditions. This paper review critically discusses automotive braking systems, the benefits of non-natural fiber brake pads, the process of particle emission formation, the components and manufacturing factors of composite brake pads, and the environmentally friendly qualities of brake pads. This study provides an exciting opportunity to advance our knowledge of the presence of natural fibers and organic particles in composite brake pads, which greatly improves the performance of automotive brake systems because they have super physical and mechanical properties, as well as great tribological and thermal endurance. Moreover, eco-friendly brake pads are typically biodegradable, which helps reduce ecological damage, minimize health concerns for humans and animals, and promote a sustainable automobile sector. Furthermore, eco-friendly brake pads show great potential for further advancement in reducing pollutant emissions and enhancing performance.
Advancements in sustainable material development: A Comprehensive review of coir fiber and its composites Imran, Al Ichlas; Siregar, Januar Parlaungan; Cionita, Tezara; Hadi, Agung Efriyo; Setiyo, Muji; Mat Rejab, Mohd. Ruzaimi; Jaafar, Jamiluddin; Fitriyana, Deni Fajar; Dewi, Rozanna
Mechanical Engineering for Society and Industry Vol 4 No 3 (2024): Special Issue on Technology Update 2024
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.12556

Abstract

Derived from Coir coconut waste, coir fiber offers an environmentally friendly response to ecological challenges in various industries. Its application aligns with achieving Sustainable Development Goals (SDGs), such as eliminating extreme poverty, ensuring food security, and promoting decent employment and economic expansion. It also fosters environmentally friendly consumption and production, mitigates global warming, and conserves biodiversity. The study involves a comprehensive review of current literature, examining the methodologies including extraction techniques, surface modifications, and manufacturing processes like hand layup, casting, compression molding, hot pressing, and injection molding. The analysis identifies key improvements in mechanical, thermal, and physical properties of coir fiber composites, particularly enhanced tensile strength, thermal stability, and reduced water absorption due to chemical treatments. This confirms previous findings and contributes toward enhancing our understanding that coir fiber is extensively utilized in multiple industries, including housing, construction, transportation, biomedical, wrapping, electrical power, communication technology, biofuel, and bioenergy due to their natural abundance, affordability, ease of shaping, superior durability, and eco-friendly characteristics. Another crucial practical implication is that coir fiber and its composites offer numerous advantages that have significant consequences for the development of coir fiber in various fields.
COMPOSITION OF EMPTY FRUIT BUNCH, BIOGAS, AND MESOCARP AS RENEWABLE ENERGY TO REPLACE PALM KERNEL SHELL WITH THE OPTIMUM GAS EMISSION (SO2, NO2 AND CO2) IN INDUSTRY Setiawan, Sandi Apriandi; Bhikuning, Annisa; Potto, Hezron Elyakim; Setiawan, Budi; Cionita, Tezara
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 8, NUMBER 1, APRIL 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v8i1.21702

Abstract

Indonesia is the largest palm oil-producing country in the world, with a share of 59%. In 2013 to 2023, palm oil production in Indonesia increased by an average of 4.7%. The emergence of waste also increases along with the increase in production. Palm oil mill waste consists of palm oil mill liquid waste (POME), mesocarp fiber, palm kernel shells, and empty oil palm bunches. In this study, waste from palm oil, such as mesocarp fiber and empty fruit bunches, can be used to replace the palm kernel shells. Moreover, the addition of biogas to mesocarp fiber and empty fruit bunches will be used as an addition to replace fuel in boiler. Gas emission (SO2, NO2 and CO2) is key parameter for process combustion in boiler Boiler gas emission is regulated by Ministry of Environment regulation. Aim: This study was aimed to analyze and determine the optimum composition that can be used in boiler fuel where gas emissions are the main parameters, especially N02, SO2 & CO2.  Methodology and results: The method in this study are a literature review, analyzing materials for proximate and ultimate, then analyzing the results. The results of this study are the optimum composition of 85% mesocarp fiber, 10% biogas, and 5% empty bunch fiber where composition  SO2 and NO2  do not exceed the threshold and the lowest CO2 gas production. Conclusion, significance and impact study: This study can be impacted to decrease waste from palm oil industry and used the waste palm as new alternative energy that can replace fuel in boiler.
Co-Authors Agustinus Purna Irawan Ahmad Athoillah Ahmad Saefulloh Aldias Bahatmaka Alrasyid, Mochamad Dzaki Annisa Bhikuning Aripin, Muhammad Bustanul Atanasius Priharyoto Bayuseno Bagastomo, Riondityo Soni Budi Setiawan Dimyati, Saeful Eli Karliani Fitriyana, Deni Fajar Guteres, Natalino Fonseca Da Silva Guterres, Natalino Fonseca Da Silva Hadi, Agung Efriyo Ikbal, Asep Imran, Al Ichlas Indrawati, Lala Ismail, Nur Hidayah Ismoyo Haryanto Jamiluddin, Jamiluddin JOHNSON SIALLAGAN Junaedi, Thomas Kalatharan, Sujentheran Nair Kano, Christina Paulina Kriswanto Kriswanto, Kriswanto Manalu, Janviter Mat Rejab, Mohd Ruzaimi Mat Rejab, Mohd. Ruzaimi Muhammad Khafidh Muji Setiyo Nanang Endriatno Potto, Hezron Elyakim Pramesti, Santinia Andiva Prasetyo, Ares Yudi Prawibowo, Hartanto Prayogo, Wisnu Puspitasari, Windy Desti Putera, Finny Pratama Rejab, Mohd Ruzaimi Mat Rifky Ismail Rozanna Dewi Sambodo Arif Wibowo Samsudin Anis Sangalang, Ronald Hadibowo Setiawan, Sandi Apriandi Silva, Mateus De Sousa Da Siregar, Januar Parlaungan Tardimanto, Yuyuk Triyani Triyani Wahyu Hidayat Wijayanto, Etanto Heiliano Wisnu Prayogo Yabansabra, Yuliana Ruth Yotenka, Rahmadi Yuris Setyoadi