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Mohamad Jamil
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INDONESIA
Journal of Science and Engineering
Published by Universitas Khairun
ISSN : 27209350     EISSN : 26213435     DOI : http://dx.doi.org/10.3387/josae
Core Subject : Science, Art, Engineering,
Arts Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation
Merupakan Jurnal Ilmiah Fakultas Teknik Universitas Khairun yang memuat hasil-hasil riset bidang ilmu-ilmu teknik dan Rekayasa
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 136 Documents
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Analisis Kualitas Website Universitas Khairun Menggunakan System Usability Scale (Sus) Muhammad, Miftah; Hizbullah, Imam; Mabud, Zulaihah
Journal of Science and Engineering Vol 7, No 2 (2024): Journal of Science and Engineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v7i2.9391

Abstract

Abstract This study analyzes the quality of the Khairun University website (unkhair.ac.id) using the System Usability Scale (SUS) method. SUS is an evaluation method consisting of 10 statements that assess effectiveness, efficiency, and user satisfaction. Data were collected by distributing questionnaires to 200 respondents who were students from 10 faculties at Khairun University. The results showed an average SUS score of 64.3, which places the quality of the website at grade "D" or based on the Acceptability range is in the "Marginal Low" range with an "OK" assessment in the adjective rating assessment. Analysis of the distribution of respondents' answers indicates that although most users find the website easy to use, there are aspects that require more attention, especially in design and navigation. Recommendations for improvement include increasing design consistency, simplifying the usage process, and adding documentation and user guides. The results of this study are expected to be a reference for improving the user experience and usability of the Khairun University website.
STUDI PENGARUH LAMA WAKTU PENGADUKAN TERHADAP KUAT TEKAN BETON Puspitasari, Ira; Upin, La Ode
Journal of Science and Engineering Vol 7, No 1 (2024): Journal Of Science And ENgineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v7i1.8750

Abstract

In obtaining good concrete quality according to the requirements, sometimes problems arise including urgent and limited time to immediately accelerate the work, the distance traveled to transport concrete mixture from the mixing machine to the place of work, the influence of temperature and weather. This study aims to determine the effect of mixing time on the compressive strength of concrete. The length of stirring time in question is the amount of time used to mix the concrete mixture in minutes, which is calculated after all the ingredients are put into the mixing drum (molen). The mixing time is varied as many as 3 different times, namely 10, 20 and 30 minutes. This test was carried out at a maintenance age of 28 days, with a cylindrical test specimen dimension of 15 cm x 30 cm, each comparison was made with 3 test pieces where the total number was 9 test pieces. The compressive strength of concrete results from the length of mixing time between 10, 20, and 30 minutes. In concrete with a mixing time of 10 minutes, the highest compressive strength value is 13.01 MPa, while in the mixing time of 20 minutes, the highest compressive strength value is 15.48 MPa, and at the mixing time of 30 minutes, the highest compressive strength value is 15.48 MPa. The highest concrete content weight value is in concrete with 30-minute stirring, which is 2.30 gr/cm3, in 10-minute stirring the highest content weight value is 2.29 gr/cm3 and in 20-minute casting the highest content weight value is 2.29 gr/cm3.Keywords: Mixing time, Strong compressive,Content Weight
PENGARUH VARIASI SLAG NIKEL SEBAGAI SUBTITUSI AGREGAT HALUS PADA KARASTERISTIK CAMPURAN ASPAL BETON (HRS BASE) Hadi, Iksan; Umar, Sudirman Hi; Darwis, Muhammad; Taufiq Y.S, Muhammad
Journal of Science and Engineering Vol 8, No 2 (2025): Journal of Science and Engineering (Josae)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v8i2.10939

Abstract

Lapisan tipis aspal beton (Lataston) merupakan jenis perkerasan yang umum digunakan di Indonesia karena memiliki keunggulan kedap air dan stabilitas yang tinggi sehingga mampu memikul beban besar. Namun, perkerasan ini rentan mengalami deformasi alur (rutting) dan retak akibat kelelahan (fatigue) yang disebabkan oleh faktor cuaca serta kualitas aspal dan agregat yang kurang baik. Penelitian ini dilakukan untuk mengetahui sejauh mana pengaruh variasi kadar slag nikel terhadap karakteristik campuran Lataston HRS-BASE. Slag nikel digunakan sebagai bahan substitusi agregat halus yang lolos saringan No. 8 dan tertahan pada saringan No. 200, tanpa melalui penyetaraan volume. Variasi slag nikel yang digunakan adalah 0%, 25%, 50%, 75%, dan 100%. Pengujian dilakukan menggunakan Marshall Test.Hasil utama pengujian Marshall menunjukkan data stabilitas tertinggi diperoleh pada kadar aspal 6% dengan variasi slag nikel 0%, yaitu sebesar 1107,20 kg, nilai Flow tertinggi adalah pada kadar aspal 5% dengan variasi slag nikel 0%, yaitu 4,37 mm, nilai Void In Mix (VIM) tertinggi juga didapatkan pada kadar aspal 5% dengan variasi slag nikel 0%, yaitu 5.79, nilai Void in the Mineral Agregate (VMA) tertinggi terjadi pada kadar aspal 7% dengan variasi slag nikel 0%, yaitu 18.30, Nilai Void Filled Bitumen (VFB) tertinggi tercapai pada kadar aspal 7% dengan variasi slag nikel 100%, yaitu 85.29, dan nilai marshall quotient tertinggi diperoleh pada kadar aspal 6% dengan variasi slag nikel 0%, yaitu 348.81 kg/mm.
1-BIT FULL ADDER VIRTUAL TRAINER FOR ELECTRICAL ENGINEERING EDUCATION Muhammad, Miftah; Dharmawan, Dharmawan; Suparman, Suparman
Journal of Science and Engineering Vol 8, No 2 (2025): Journal of Science and Engineering (Josae)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v%vi%i.10967

Abstract

The increasing complexity of digital logic design and the rapid evolution of remote learning environments have highlighted the need for innovative educational tools in electrical engineering. Traditional laboratory-based methods, while effective for hands-on learning, often face challenges related to cost, accessibility, and infrastructure limitations, which restrict student engagement and practice opportunities. In response, virtual learning platforms have emerged as cost-effective alternatives that bridge the gap between theoretical knowledge and practical application. This study presents the development of a 1-bit Full Adder Virtual Trainer designed to enhance conceptual understanding and practical skill acquisition in digital logic courses. The system integrates interactive simulation, real-time logic evaluation, and visual feedback to facilitate the comprehension of fundamental circuit behavior. By enabling students to experiment with input variables and observe logical operations dynamically, the trainer supports a more engaging and flexible learning experience. The proposed tool aims to strengthen the link between theory and practice in electrical engineering education, providing an accessible, efficient, and scalable approach to digital electronics learning.
ANALISIS LITOLOGI BAWAH PERMUKAAN MENGGUNAKAN METODE GEOLISTRIK PADA LOKASI LONGSORAN JALAN PAYAHE-WEDA PROVINSI MALUKU UTARA Firman, Firman; Bundang, Syarifullah; Ela, Rifaldi
Journal of Science and Engineering Vol 8, No 2 (2025): Journal of Science and Engineering (Josae)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v8i2.10929

Abstract

AbstrakRuas jalan Payahe-Weda sering terjadi longsoran akibat tingginya intensitas pelapukan, curah hujan yang tinggi, lebatnya vegetasi, serta morfologinya cenderung berbukit dengan lereng curam. Penelitian analisis litologi bawah permukaan menggunakan metode geolistrik pada lokasi longsoran jalan Payahe-Weda dilaksanakan pada 2 titik, yaitu STA 01+200 dan STA 01+450. Kegiatan penanganan longsoran jalan pada kedua lokasi tersebut membutuhkan data litologi untuk kebutuhan desain lereng dan penangananya sehingga penting dilakukan analisis litologi menggunakan geolistrik konfigurasi Wenner-Alpha. Tahapan penelitian dimulai dari persiapan, pengambilan data lapangan berupa singkapan batuan di lokasi, data beda potensial dan kuat arus, spasi elektroda, elevasi, koordinat dan arah lintasan. Penelitian ini terkategori penelitian kuantitatif dalam hal pengukuran nilai resistivitas batuan, tetapi interpretasi litologinya bersifat kualitatif. Hasil penelitian pada lokasi STA 01+200, litologi pada lintasan tersebut adalah lempung pasiran, konglomerat, dan bedrock. Pada lintasan ini mengindikasikan adanya anomali berupa zona rekahan, perubahan kondisi lapisan batuan dampak dari terjadinya subsiden yang dijumpai di permukaan. Lintasan STA 01+450 litologinya juga relatif sama, yaitu lempung pasiran, konglomerat, dan bedrock. Resistivitas lempung pasiran 16,1-123 Ωm kedalaman 0-14 m, konglomerat resistivitasnya 120-1000 Ωm kedalaman 6-25 m sedangkan bagian bedrock resistivitas paling tinggi menunjukan batuannya keras sehingga tahanan jenisnya besar, yaitu 200-4000 Ωm dengan kedalaman 18,5-31,9 m.Kata kunci: bedrock, konglomerat, litologi, Payahe-Weda, Wenner-Alpha
Thermoelectric Generator Performance as a Power Generator in a Portable Stove Jayanegara, Sudarmanto
Journal of Science and Engineering Vol 8, No 2 (2025): Journal of Science and Engineering (Josae)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v8i2.10970

Abstract

A thermoelectric generator (TEG) is a device that can convert heat energy into electrical energy through the Seebeck effect. This study aims to analyze the performance of a TEG as a power generator in a portable stove by utilizing the waste heat generated during the combustion process. Tests were conducted with varying temperature differences between the hot and cold sides of the TEG, as well as measuring the output power and energy conversion efficiency. The results show that the performance of a TEG is greatly influenced by the given temperature difference, where increasing the temperature on the hot side and optimal cooling on the cold side can increase the electrical power generated. Although the conversion efficiency is still relatively low, this system has potential as an alternative power source for small devices in off-grid environments. This study is expected to be a reference in the development of thermoelectric technology for portable and renewable energy applications. 
Degradation of Phenolic Compounds Using Pseudomonas aeruginosa and Enterobacter cloacae Bacteria in Groundwater (Case Study: Gempolsari Village) Aulia Nur Febrianti; Dwi Ramadya Risqiana Putri; Rhenny Ratnawati
Journal of Science and Engineering Vol 9 No 1 (2026): Journal of Science and Engineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v9i1.11802

Abstract

The Lapindo mudflow disaster in Porong, Sidoarjo, has caused long-term environmental contamination, particularly affecting groundwater quality in surrounding residential areas such as Gempolsari Village. One of the major pollutants identified in contaminated groundwater is phenol, an aromatic hydrocarbon compound that poses significant risks to both human health and aquatic ecosystems. This study aimed to evaluate the effectiveness of Pseudomonas aeruginosa and Enterobacter cloacae in degrading phenol compounds in groundwater contaminated by Lapindo mudflow under aerobic conditions. The biodegradation experiment was conducted using three treatment variations, namely variation A (Pseudomonas aeruginosa : Enterobacter cloacae = 10:0), variation B (5:5), and variation C (0:10). Prior to treatment, groundwater quality parameters including pH, temperature, dissolved oxygen, and phenol concentration were analyzed. Observations of bacterial growth, pH changes, and phenol degradation were carried out at 6, 12, and 18 hours. The results showed that all treatment variations were capable of degrading phenol effectively, achieving complete phenol removal at the 18th hour. However, variation C demonstrated the best performance during the intermediate observation period, reducing phenol concentration from 0.0089 ppm to 0.0046 ppm at the 12th hour with a degradation efficiency of approximately 72.6%. The pH values remained stable within the range of 6–7, indicating favorable environmental conditions for bacterial activity. In addition, bacterial population growth observed throughout the experiment confirmed the ability of both bacterial species to adapt and utilize phenol as a carbon and energy source. These findings indicate that Pseudomonas aeruginosa and Enterobacter cloacae have strong potential for application in the bioremediation of phenol-contaminated groundwater affected by Lapindo mudflow.
Pentahelix Synergy in Coral Conservation: Restoring Ecological Health and Enhancing Social Trust through CBPR in Prigi Bay Dwi Ramadya Risqiana Putri; Aulia Nur Febrianti
Journal of Science and Engineering Vol 9 No 1 (2026): Journal of Science and Engineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v9i1.11806

Abstract

Coral reef ecosystems at Mutiara Beach, Trenggalek, face degradation due to sedimentation and non-environmentally friendly tourism. This study documents a community service initiative using a Community-Based Participatory Research (CBPR) approach to rehabilitate the reef and empower local stakeholders. Through a Pentahelix synergy involving academics, government, security forces (TNI), the private sector, and the community, 3800 coral fragments were successfully transplanted onto 12 iron rack units. Results indicate a significant increase in coral cover and fish populations, alongside a rise in tourism visits, evidenced by high ticket sales. Furthermore, the project established a sustainable “field laboratory” and strengthened social trust combining technical restoration with multi-stakeholder collaboration is vital for long-term marine conservation.
Analisis Waktu Pelaksanaan Kerja Pada Proyek Pembangunan Menara Lonceng Gereja Santo Martinus Bola Dengan Menggunakan Metode CPM (Critical Path Method) Claudia Ekarista Sika Keytimu; Firnimus Konstantinus Bhara; Mariela Anjelica Natasya
Journal of Science and Engineering Vol 9 No 1 (2026): Journal of Science and Engineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v8i2.10798

Abstract

This studi aims to analyze the scheduling of the Ball Tower Construction Project of Santo. Martinus Bola Church using the Critical Path Method (CPM) to determine the critical path method. and estimate the optimal project completion time. The research data were obtained fro the project’s activity breakdown and analyzed using forward pass and backward pass calculations to determine the earliest start(ES), earliest finish (EF), latest start(LS), latest finish (LF), and slack time for each activity. This analysis results show that there are 16 activities included in the critical path, such as hard soil excavation for footplate foundations, sand backfill under the footplate, and reinforced concrete structural works from sloof, columns, beams, to floor slabs and roof slabs. Meanwhile, 4 other activities are non-critical as they shortened from the initial plan of 215 days, resulting in an acceleration of 35 days. These findings indicate that the CPM is effective for planning and controlling project time in building construction projects.
Analisis Pencemaran Udara Akibat Aktivitas Industri Pertambangan Terhadap Kualitas Lingkungan Masyarakat di Desa Lelilef Kabupaten Halmahera Tengah Provinsi Maluku Utara Nur Rofiah; Hilda Alkatiri; Arbi Haya
Journal of Science and Engineering Vol 9 No 1 (2026): Journal of Science and Engineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v9i1.10959

Abstract

Aktivitas pertambangan di Desa lelilef, yang didominasi oleh penambangan nikel, telah membawa dampak signifikan salah satunya terkait dengan pencemaran udara. Pencemaran udara ditimbulkan oleh aktivitas industri pertambangan, seperti pembakaran bahan bakar, pengangkutan material, dan proses peleburan logam, berpotensi menurunkan kualitas lingkungan di sekitar lingkar tambang. Penelitian ini bertujuan untuk mengetahui tingkat kualitas udara didaerah lingkar tambang khususnya Desa Lelilef, kecamatan Weda Tengah, Kabupaten Halmahera Tengah. Analisis digunakan berdasarkan 6 parameter, yaitu PM10, PM2.5, NO2, SO2, CO, dan O3. Penelitian ini menggunakan pendekatan deskriptif kuantitatif dengan dua metode pengumpulan data yaitu pengambilan data kualitas udara hasil laboratorium dan penyebaran kuesioner kepada masyarakat. Hasil analisis dari data laboratorium menunjukan bahwa pada tahap I parameter O3 mencapai angka 58 dan PM2.5 mencapai 68, yang terdapat pada kategori sedang sesuai Peraturan Menteri Lingkungan Hidup dan Kehutanan nomor 14 tahun 2020 tentang Indeks Standar Pencemaran Udara. Sementara parameter lainnya seperti SO2, NO2, CO dan PM10 masih dalam kategori baik. Persepsi masyarakat 65% menyatakan bahwa mayoritas responden mengakui dan merasakan langsung permasalahan yang dimaksud dalam pernyataan tersebut yaitu adanya dampak pada kesehatan dan lingkungan yang diakibatkan dari pencemaran udara akibat aktivitas industri pertambangan. Selain itu, 69% mengindentifikasikan bahwa masalah yang dikemukakan benar-benar dirasakan oleh sebagian besar responden yaitu tidak adanya upaya dari pihak perusahaan dan pemerintah terkait pencemaran udara di Desa Lelilef tersebut. Oleh karena itu, penelitianini hal ini mencerminkan adanya indikasi permasalahan yang perlu ditindaklanjuti lebih lanjut, baik melalui evaluasi maupun upaya perbaikan dari pihak terkait.

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