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All Journal JIPSINDO (Jurnal Pendidikan Ilmu Pengetahuan Sosial Indonesia) Jurnal Riset Pendidikan Matematika FLYWHEEL : Jurnal Teknik Mesin Untirta JURNAL ENGGANO Journals of Ners Community Manutech : Jurnal Teknologi Manufaktur Journal of System and Computer Engineering JTTM: Jurnal Terapan Teknik Mesin Integrated Science Education Journal Fish Scientiae : Jurnal Ilmu-Ilmu Perikanan dan Kelautan Journal of Applied Agricultural Science and Technology Dulang: Jurnal Pengabdian Kepada Masyarakat JATIMAS : Jurnal Pertanian dan Pengabdian Masyarakat Jurnal Inovasi Teknologi Terapan MCSIJ (Marine, Coastal and Small Islands Journal) : Jurnal Tugas Akhir Mahasiswa Ilmu Kelautan
Yuliyanto Yuliyanto
Universitas Lambung Mangkurat
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Nursing Physics Social Sciences Transportation Other

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Analisis Lapisan Serat Kulit Jagung Kering Dengan Pengaruh NaOH 4% Komposit Matriks Polyester Terhadap Pengujian Tarik dan Bending: Bahasa Indonesia Yus Andi, Zulfan; Yuliyanto, Yuliyanto; Razqi, Fadilla Muhamad
Manutech : Jurnal Teknologi Manufaktur Vol. 17 No. 01 (2025): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/manutech.v17i01.534

Abstract

This study aims to analyze the effect of dry corn husk fiber layers with a 50% volume fraction on the mechanical properties of composites made using the hand lay-up method and alkali NaOH treatment. The corn husk fibers were treated with 4% NaOH for 1, 2, and 3 hours at temperatures of 80°C, 90°C, and 100°C to produce composites with polyester resin. Tensile and bending tests were conducted according to ASTM D-638 and ASTM D-790 standards. The results showed that NaOH treatment for 3 hours at 90°C produced the highest tensile strength of 21.1 Mpa, while NaOH treatment for 1 hour at 80°C produced the highest bending strength of 53.0 Mpa. On the other hand, NaOH treatment for 2 hours at 80°C resulted in the lowest tensile strength of 5.84 Mpa, and NaOH treatment for 2 hours at 100°C resulted in the lowest bending strength of 8.53 Mpa. Longer treatment durations and higher temperatures effectively remove lignin and hemicellulose, increasing tensile strength but can damage the fiber structure for bending tests. This study demonstrates the potential of corn husk fibers as an environmentally friendly and sustainable composite material.
Study of Sambiloto Andrographis paniculate Ness. Extract as an Eco-Friendly Biocontrol on Weed Seed Germination and Growth Madusari, Sylvia; Marzuki, Slamet; Yuliyanto, Yuliyanto
Journal of Applied Agricultural Science and Technology Vol. 7 No. 4 (2023): Journal of Applied Agricultural Science and Technology
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jaast.v7i4.93

Abstract

The use of synthetic herbicides causes many problems, including pollution, a decrease in soil organic content, and weed resistance to specific herbicides. Plants provide a source of novel phytotoxic compounds that can be evaluated in the search for efficient and ecologically safe herbicides. This research aimed to examine the allelochemical bioherbicidal activity of sambiloto (Andrographis paniculate Ness) leaf extract (SLE) to suppress weed seed germination and growth. The experiment was designed to investigate the effect of the SLE as a potent weed seed germination inhibitor and retard weed growth. In this experiment, a non-factorial randomized block design was used, with treatments SLE0 (0% Extract), SLE1 (Extract 0.1%), SLE2 (Extract 0.5%), SLE3 (Extract 1.0%), and SLE4 (Extract 1.5%). The result showed that weed height and biomass were significantly reduced after the extract was applied. The plant-based extracts contained 0.1114% flavonoids and 0.1628% tannins. The findings suggest that this sambiloto herbaceous extract has a promising future in modern plant protection as bioherbicide to suppress germination and weed growth. Therefore, the application of these bio-products could be beneficial for sustainable agricultural practices.
STRES MENGHADAPI UJIAN AKHIR SEMESTER DENGAN POLA TIDUR MAHASISWA Umah, Khoiroh; Yuliyanto, Yuliyanto
Journals of Ners Community Vol 5 No 2 (2014)
Publisher : Fakultas Ilmu Kesehatan Universitas Gresik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55129/jnerscommunity.v5i2.96

Abstract

ABSTRAKStres merupakan suatu keadaan yang disebabkan oleh ketidakmampuan individuterhadap tuntutan internal maupun eksternal stimulus yang dapat membahayakanpenyesuaian diri terhadap situasi. Adanya stres dalam menghadapi ujian mengakibatkanperubahan istirahat dan tidur yang berbeda pada setiap mahasiswa. Masih banyakditemukan mahasiswa yang mengalami gangguan pola tidur saat menghadapi ujian seperti:sulit memulai tidur, lingkungan ramai, dan jumlah jam tidur (kurang dari kebutuhan).Namun hubungan stres dalam menghadapi ujian akhir semester dengan pola tidur belumdapat dijelaskan.Desain penelitian ini menggunakan Cross sectional, dengan teknik purposivesampling. Sampel diambil sebanyak 52 responden. Variabel independen adalah stres danvariabel dependen adalah perubahan pola tidur. Data diambil dengan menggunakankuesioner.Hasil uji statistik korelasi spearmans rank didapatkan hasil ρ=0,02 yang berarti adahubungan stres dalam menghadapi ujian akhir semester dengan pola tidur mahasiswa ProdiS1 Keperawatan Universitas Muhammadiyah Surabaya, dengan r= 0,418 yang berartitingkat hubungan cukup.Hasil penelitian ini diharapkan dapat menambah pengetahuan dan penanggulangancara menghadapi stres dengan membuat suatu kebiasaan positif dengan menghindari suatuperubahan yang berlebihan.Kata kunci: Stres Ujian Akhir, Pola tidur, Mahasiswa Program Studi KeperawatanABSTRACTStress was a condition caused by the inability of the individual to the demands ofinternal and external stimulus that can harm the adaptation to the situation. The stress offinal exam caused change sleep pattern and different on each student. There are still manystudents who experience disruption in sleep patterns when facing exams such as: hardstart sleeping, crowded environment, and the number of hours of sleep (less thanrequirement). However, the relationship of stress in dealing with final exams with sleeppatterns can not be explained.This study design used cross sectional, with purposive sampling technique. Sampleswere taken as many as 52 respondents. The independent variable was stress and thedependent variable was the change in sleep patterns. Data colleted using a questionnaire.The results of statistical test spearmans rank correlation result obtained ρ= 0.02,which means that there was a relationship of stress dealing in final exams with sleeppatterns student of Nursing Program Study Muhammadiyah Surabaya, and r= 0.418,which means the level of relationship is Enough.This study is expected to increase the knowledge and control of stress by creating apositive habit to avoid an excessive change.Keywords: Stress of final exam, Sleep patterns, Student of Nursing Program Study
Analysis of simulation-based (FEA) strength and durability test modeling of natural fiber reinforced composite materials Rangga Pratama, Rangga Pratama; Boy Rollastin, Boy Rollastin; Yuliyanto, Yuliyanto
JTTM : Jurnal Terapan Teknik Mesin Vol 7 No 1 (2026): JTTM: Jurnal Terapan Teknik Mesin
Publisher : Teknik Mesin - Universitas Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/jttm.v7i1.1956

Abstract

The need for lightweight, strong, and environmentally friendly materials in the maritime industry has driven research into natural fiber-based composites as an alternative to metal. Composite materials reinforced with coconut fiber, banana stem, and palm fiber were chosen because of their abundant availability and potential mechanical characteristics for structural applications such as boat bodies. This study aims to model and analyze the flexural strength and impact resistance of composites reinforced with three types of natural fibers using a Finite Element Analysis (FEA) simulation method in ANSYS software. The test standards used include ASTM D790 for three-point flexural tests and ASTM D256 for Izod impact tests. Simulations were carried out with variations in fiber volume fractions of 3%, 5%, and 7% to obtain maximum stress, strain, and deformation responses. The results showed that the banana stem fiber composite had the highest flexural strength of 148.09 MPa, while the palm fiber fiber showed the highest impact resistance of 145.26 MPa. Validation against literature data shows a difference in simulation results of only around ±5%, confirming the accuracy of the numerical model in predicting the mechanical behavior of the composite. The conclusions of this study indicate that the FEA-based simulation approach is effective in assessing the performance of natural fiber composites and confirms their potential use as an alternative material to metals for lightweight structural applications in the maritime sector.
Analisa Volatile Matter dan Ash Content Briket Batubara Terhadap Penambahan Biomassa Sekam Padi Lioe, Kon Phin; Wahyudie, Illham Ary; Yuliyanto, Yuliyanto
Manutech : Jurnal Teknologi Manufaktur Vol. 17 No. 02 (2025): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/manutech.v17i02.457

Abstract

One of the leading exports in Indonesia is coal and contributes significantly to the country's economy. However, there is coal that cannot be exported because it has a size dimension that is too small, therefore research is carried out to make briquettes. The purpose of this research is to get the best results from testing volatile matter and ash content with different temperatures, times, water:molasses fractions. The highest volatile matter test results were obtained from 100 ? temperature, 90 minutes time and water:molasses fraction (3:1) with a value of 31.73% and the lowest value was obtained from 120 ? temperature, 60 minutes time and water:molasses fraction (3:1) with a value of 23%. While the highest ash content test results were obtained from a drying temperature of 120 ?, time 90 minutes and water:molasses fraction (3:2) with a value of 48.6% and the lowest value was obtained from a drying temperature of 100 ?, time 60 minutes and water:molasses fraction (3:2) with a value of 41.83%. From the test results of volatile matter and ash content, it still does not meet SNI standards.
Pengaruh Penggunaan Kapur Sirih Sebagai Perekat Terhadap Kekuatan Tekan Briket Batubara Yuliyanto, Yuliyanto; Wahyudie, Illham Ary; Kon Phin, Lioe
Manutech : Jurnal Teknologi Manufaktur Vol. 17 No. 02 (2025): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/manutech.v17i02.492

Abstract

The increasing dependence on fossil fuels drives the need for alternative energy solutions to reduce environmental impacts and reliance on petroleum. Coal, particularly anthracite, has emerged as one of the best options due to its abundant availability in Indonesia. However, coal combustion often results in the emission of harmful gases, requiring special handling. This study aims to develop coal briquettes using lime water as a binder. In addition to improving the mechanical characteristics of the briquettes, lime water is also intended to reduce sulfur gas emissions during the briquette combustion process. The briquettes were produced using a binder-to-water ratio (5:6, 5:7, 5:8, 5:9), pressing pressure (8, 9, 10 tons), and drying time (2, 4, 6 days). Compression testing was conducted following the ISO 844 standard using a Universal Testing Machine. The highest result in this study was 502 kPa (5.11 kg/cm²), achieved with a binder-to-water ratio of 5:9, a pressing pressure of 8 tons, and a drying time of 4 days. However, this result remains far below the SNI standard (50 kg/cm²).
The Effect of Fiber Length on the Strength of Composites as Boat Body Materials Pratika, Anggun; Yuliyanto, Yuliyanto; Juanda, Juanda
Integrated Science Education Journal Vol 7 No 1 (2026): January
Publisher : Cahaya Ilmu Cendekia Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37251/isej.v7i1.2456

Abstract

Purpose of the study: This study investigates the effect of coconut fiber length on the mechanical performance of polyester-based composite materials intended as an alternative body material for small boats, addressing the growing demand for sustainable and locally sourced marine materials. Methodology: An experimental research design was employed using coconut fiber reinforcements with lengths of 10 mm, 30 mm, and 50 mm at a fixed fiber–resin ratio of 5%:95%. Composite specimens were fabricated using the hand lay-up method, reflecting practical production conditions commonly used in small-boat construction. Mechanical characterization was conducted using flexural strength testing in accordance with ASTM D790-02 and impact strength testing in accordance with ASTM E-23, using a Zwick Roell Z020 universal testing machine. Main Findings: The results demonstrate a clear positive correlation between fiber length and mechanical strength, with longer fibers providing more effective stress transfer and energy absorption within the composite matrix. The composite reinforced with 50 mm of coconut fiber exhibited the highest performance, achieving a flexural strength of 63.4 MPa and an impact strength of 45.42 kJ/m², both of which meet the mechanical requirements for small-boat materials set by the Indonesian Classification Bureau. Novelty/Originality of this study: Optimization of coconut fiber length for marine-grade polyester composites, offering empirical evidence that locally available natural fibers can meet regulatory standards for small vessel applications. This research advances eco-friendly composite technology and presents coconut fiber–reinforced polyester as a viable, sustainable alternative to conventional wood-based boat materials.
Co-Authors Abda Abda Adha, Adha Adi Pratama, Adi Afriadi, Achmad Afriadi, Muhammad Ahmad Gunadi, Ahmad Aiwa, Toto Akbar Rafsanjani, Alfarobbi Al Aziz, Putra Habib Ambarwati, Indah Widya Amriyeny, Ulya Fajri Anjani, Arrum Puspita Aprilia, Zahra Dhiva Arisha, Andriansyah Oktafiandi Arliansyah, Arul Armin, Andre Hasnuryadi Baharuddin Baharuddin Baharuddin Baharuddin Chamro', Wardatul Dafiuddin Salim Dafri, Nastiar Dharta, Yuli Edy Kustiani Eko Noer Kristiyanto, Eko Noer Eko Yudo Eko Yuliarsha Sidhi Ergiantoro, Anugerah Fadhian, Muhammad Filo Fathur Rohman, Fathur Feriadi, Indra Habib Al Aziz, Putra Hakim, Zikrul Harwadi, Harwadi Hasdiansah, Hasdiansah Husman Husman Ilham Ary Wahyudie Imran, Taufik Jailani Jailani Josi, Ahmad Juanda Juanda Junaidi Junaidi Kon Phin, Lioe Kurniawan, Ade Dwi Kusuma, Rian Laily Muharani Lioe, Kon Phin Marzuki, Slamet Masdani, Masdani Muhaimin Muhaimin Muhammad Faisal Amin Muhammad Subhan Muhammad Syahdan muharram, Muhammad Munawirah, Munawirah Mustopa Mustopa Novizal Novizal, Novizal Nugraheni Hadiyanti Nurcahya, Dian Nurcahya Nursalam Nursalam Oktoviandi, Oktoviandi Oktriadi, Yudi Parulian Silalahi Permana Liu, Marcell Candra Pranata, Yogi Pratika, Anggun Pristiansyah, Pristiansyah Ramli Ramli Rangga Pratama, Rangga Pratama Razqi, Fadilla Muhamad Robert Napitupulu Rollastin, Boy Sahibu, Supriadi Saputra, Aprianor Teguh Setiawan, Iwan Dwi Simangunsong, Kristian Jubatner Somawardi Somawardi Subarkah, Imam SUBHAN, MUHAMAD Sugianto Sugianto Sujatmiko Sujatmiko Sukanto Sukanto Suzen, Zaldy Sirwansyah Sylvia Madusari Tony, Frans umah, khoiroh Ventani, Embun Wahyudie, Illham Ary Wibowo, Willy Zaldy Kurniawan Zulfan Yus Andi Zulfitriyanto, Zulfitriyanto