Jurnal Universitas 17 Agustus 1945 Surabaya
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ANALISIS DAN PERANCANGAN SISTEM TRANSMISI BERBASIS MOTOR LISTRIK PADA MESIN PEMECAH BIJI JAGUNG SKALA UMKM
Full text linkProduktivitas pascapanen jagung di tingkat petani, peternak, dan usaha mikro kecil dan menengah (UMKM) masih menghadapi kendala efisiensi akibat keterbatasan teknologi mekanisasi, khususnya pada proses pemecahan biji jagung. Kondisi ini menyebabkan tingginya kebutuhan tenaga kerja, waktu proses yang lama, serta rendahnya konsistensi hasil, sehingga pengembangan mesin pemecah biji jagung yang andal dan terjangkau menjadi penting untuk mendukung peningkatan produktivitas sektor agribisnis.
Tujuan ilmiah dari karya ini adalah merancang dan menganalisis sistem transmisi serta motor penggerak pada mesin pemecah biji jagung agar diperoleh konfigurasi mekanis yang mampu mentransmisikan daya secara optimal, aman, dan berumur pakai panjang. Penelitian ini berkontribusi pada bidang rekayasa manufaktur terapan melalui penerapan prinsip perancangan elemen mesin yang sistematis pada mesin pascapanen skala kecil.
Tujuan tersebut dicapai melalui metode perancangan konvensional yang telah teruji, meliputi studi literatur, pengumpulan data teknis, perhitungan daya motor, perancangan poros dan bantalan, pembuatan desain mekanik, serta proses fabrikasi dan perakitan mesin. Analisis elemen mesin dilakukan berdasarkan teori perencanaan poros, transmisi daya, dan umur bantalan untuk memastikan keandalan sistem selama operasi.
Hasil utama penelitian menunjukkan bahwa mesin pemecah biji jagung dirancang menggunakan motor listrik berdaya 1 HP dengan kebutuhan daya aktual sebesar 1,002 kW pada putaran 2800 rpm. Sistem transmisi menggunakan poros berdiameter 19 mm berbahan ASTM 41 dan bantalan tipe ball bearing nomor 6302, dengan hasil perhitungan umur bantalan mencapai 65.785,48 jam, yang menunjukkan tingkat keandalan operasional yang tinggi.
Pemahaman baru yang diperoleh dari penelitian ini adalah bahwa perancangan sistem transmisi dan motor penggerak yang tepat, meskipun menggunakan metode konvensional, mampu menghasilkan mesin pemecah biji jagung yang efisien, ekonomis, dan layak diterapkan pada skala UMKM. Hasil ini memberikan kontribusi praktis sebagai referensi desain mesin pascapanen serta dasar pengembangan lebih lanjut menuju mesin dengan kapasitas dan performa yang lebih tinggi
PERANCANGAN TROLLEY PEMINDAH DRUM BERKAPASITAS 200 LITER DENGAN BERAT MAKSIMUM 225 kg
Full text linkABSTRAK
Perancangan troli pemindah drum manual dengan kapasitas 200 liter dan berat maksimum 225 kg bertujuan untuk menyediakan alat yang sederhana, praktis, dan aman untuk pemindahan barang di industri. Metode konvensional pemindahan drum menggunakan tenaga manusia menimbulkan risiko cedera pada pekerja dan meningkatkan potensi tumpahan. Oleh karena itu, diperlukan solusi inovatif untuk meningkatkan efektivitas pemindahan barang. Troli yang dirancang sederhana, murah, mudah perawatannya, dan mudah digunakan. Alat ini merupakan alat yang tidak mempunyai penggerak yang dioperasikan secara manual dengan cara didorong. Material rangka utama troli adalah pipa besi (pipa ASTM A53) dengan diameter 60 mm, schedule 40, dan tinggi desain troli adalah 125 cm. Total beban yang diterima oleh struktur utama troli adalah 225 kg, yang berasal dari massa drum (45 kg) dan massa oli (180 kg). Analisis perhitungan dilakukan untuk menentukan pusat massa (center of mass), gaya desain (Fdesain), momen maksimum (Mmax), dan modulus profil yang dibutuhkan (Wreq). Berdasarkan perhitungan, Mmax adalah 366100.1 Nmm dan Wreq adalah 2197.48 mm3. Dengan menggunakan pipa berdiameter luar 60.02 mm, modulus aktual (Waktual) yang diperoleh adalah 5298.24 mm3. Karena Waktual>Wreq, material pipa dinyatakan aman untuk digunakan sebagai struktur utama.
Kata kunci: Troli pemindah drum, rancang bangun, beban maksimum 225 kg, kapasitas 200 lite
Loneliness dengan fear of missing out (fomo) pada generasi z perantau
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This study aims to examine the relationship between loneliness and Fear of Missing Out (FOMO) among migrant Generation Z individuals. The study involved 140 Generation Z participants who were born between 2000-2012 and had migrant status in Surabaya. Data were collected using the UCLA Loneliness Scale and a Fear of Missing Out (FOMO) scale developed by the researcher based on relevant indicators. Data analysis using Spearman’s rho correlation yielded a correlation coefficient of r = 0.855 with a significance value of p = 0.000, indicating a positive and significant relationship between loneliness and Fear of Missing Out (FOMO). This finding suggests that higher levels of loneliness are associated with higher levels of Fear of Missing Out (FOMO) among migrant Generation Z individuals in Surabaya. Conversely, lower levels of loneliness are associated with lower levels of Fear of Missing Out (FOMO) among migrant Generation Z individuals in Surabaya.
Abstrak
Penelitian ini bertujuan untuk mengetahui hubungan antara Loneliness dengan Fear Of Missing Out (FOMO) pada generasi Z perantau. . Penelitian ini menggunakan pendekatan kuantitatif korelasional. Subjek penelitian berjumlah generasi Z yang kelahiran tahun 2000-2012 dan berstatus perantau di Surabaya. Instrumen pengumpulan data menggunakan skala UCLA Loneliness Scale dan skala Fear Of Missing Out (FOMO) yang dikembangkan oleh peneliti berdasarkan indikator. Analisis pada penelitian menggunakan korelasi Spearman’s rho menghasilkan nilai koefisien r = 0,855 dengan signifikansi p = 0,000 yang menunjukkan terdapat hubungan positif dan signifikan antara Loneliness dengan Fear Of Missing Out (FOMO). Artinya, semakin tinggi loneliness maka semakin tinggi Fear Of Missing Out (FOMO) pada generasi Z perantau di Surabaya. Sebaliknya, semakin rendah loneliness maka semakin rendah Fear Of Missing Out (FOMO) pada generasi Z perantau di Surabaya.
 
Classification of Volcanic Status Events Using Autocorrelation and Support Vector Machine Methods
Full text linkVolcanic eruption disasters occur frequently in Indonesia due to the high density of active volcanoes, posing persistent risks to surrounding communities and infrastructure. Effective mitigation of these hazards is challenged by limitations in monitoring systems, particularly related to instrumentation coverage and the availability of expert human resources. One critical aspect of volcanic monitoring is the accurate classification of seismic activity, which reflects subsurface volcanic processes and supports timely hazard assessment. This study addresses the challenge of reliably classifying volcanic seismic events by proposing an integrated framework that combines autocorrelation-based signal characterization with Support Vector Machine (SVM)–based multi-class classification, supported by Z-score normalization during data preprocessing. The framework is designed to enhance feature consistency and robustness against noise commonly present in volcanic seismic signals. To evaluate its effectiveness, three SVM kernel functions—linear, polynomial, and radial basis function (RBF)—are systematically assessed under identical experimental conditions. The results demonstrate that the polynomial SVM kernel with a degree of two provides the most reliable classification performance, achieving an accuracy of 0.9605. In addition, the application of Z-score normalization substantially improves model stability and overall performance across all kernel configurations, indicating that feature scaling plays a critical role in SVM-based seismic classification. Performance variations among kernels suggest that non-linear feature representations are better suited to capture the complex characteristics of volcanic seismic signals, while classification errors are primarily influenced by class imbalance in underrepresented event types. These findings indicate that the proposed framework effectively supports automated volcanic seismic signal analysis and has the potential to enhance the reliability of seismic-based volcanic activity monitoring
RPG-Based Educational Game for Personal Data Security Awareness in Elementary School Students: A Design and Usability Study
Full text linkAs more and more elementary school-aged children use the internet, they are more likely to be exposed to cybersecurity threats, especially when it comes to keeping their personal information safe. Various educational media have been developed to introduce cybersecurity concepts to children, but most remain passive and do not engage children in simulated real-life digital risk situations. This research addresses this gap by proposing an RPG-based educational game that integrates personal data security concepts into gameplay missions tailored to the cognitive characteristics of children aged 10–12. The goal of this study was to create and assess an educational game that could serve as a substitute learning tool for personal data security. The game was developed using the Game Development Life Cycle framework and implemented using RPG Maker MV. Usability testing involved 20 elementary school students and was carried out through direct observation of 13 game scenes. The success rate indicates the number of students who were able to complete each scene independently. The test results showed that the beginning and end of the game had low success rates, indicating issues with text readability, navigation clarity, and reflective elements. The results showed that iterative improvements in the beta phase improved interface clarity and the gameplay experience. The findings in this study indicate that usability-based improvements have an important role in the design of educational games for children, and RPG-based educational games have the potential to be interactive and contextual personal data security education media
KOMUNIKASI INTERPESONAL KARYAWAN DIVISI OPERASIONAL PT FORMOSA SEJATI LOGISTICS SURABAYA DALAM MENJAGA HUBUNGAN BAIK DENGAN PELANGGAN
No full textThis study aims to analyze the interpersonal communication practices of operational division employees at PT Formosa Sejati Logistics Surabaya in maintaining good relationships with customers. This research is motivated by the high intensity of interaction between operational employees and customers in logistics service processes, including administrative activities, operational coordination, and the handling of field-related issues, which may lead to misunderstandings, conflicts, and customer dissatisfaction if not managed through effective interpersonal communication. This study employs a qualitative approach with a descriptive research design. Data were collected through in-depth interviews, direct observation, and documentation involving operational division employees and customers of PT Formosa Sejati Logistics Surabaya. The analysis is based on the concept of interpersonal communication, which includes openness, empathy, supportiveness, positiveness, and equality, and is further examined through the lens of the Fundamental Interpersonal Relations Orientation (FIRO) theory, which encompasses the needs for inclusion, control, and affection. The findings indicate that the interpersonal communication practices implemented by operational employees are able to create effective and constructive interactions with customers through clear and honest information delivery, the ability to understand customer problems, and professional as well as equal treatment in service provision. These communication practices are proven to fulfill customers’ interpersonal needs in terms of inclusion, control, and affection, resulting in customers feeling accepted, valued, and trusted throughout the service process. The fulfillment of these interpersonal needs contributes to the development of trust, comfort, and customer loyalty, which ultimately strengthens long-term cooperative relationships between the company and its customers. This study emphasizes that interpersonal communication functions not only as a medium for conveying technical information but also as an essential relational strategy for improving service quality and sustaining business relationships within the logistics service sector.Keywords: Interpersonal Communication; Logistics Service; Customer Relations; Interpersonal Needs
ANALISIS ISU GENDER: POTRET PATRIARKI DALAM FILM YUNI (2021)
Full text linkThe film Yuni (2021) directed by Kamila Andini represents the social realities of young Indonesian women living under the pressures of patriarchal culture. It addresses gender issues such as child marriage, limited access to education, control over women's bodies, and the silencing of women's voices in social spaces. This study aims to analyze the representation of gender issues in the film Yuni using the Muted Group Theory perspective. The research method employs a qualitative approach with film text analysis as primary data and literature review as secondary data. The analysis results show that Yuni depicts women as a subordinate group whose voices are often ignored and must conform to the norms and language of the dominant group. The film contributes to building public awarenessregarding gender inequality and the importance of providing space for women to voice their life choices.Beyond mere reflection, Yuni functions as a strategic intervention transforming muted groups into representational counterpublics, compelling audience critical reflection on collective complicity in patriarchy reproduction. This research contributes theoretically to MGT applications in Indonesian feminist cinema and practically to anti-child marriage advocacy and gender education equityKeywords: Gender Issues; Yuni Film; Gender Representation; Muted Group Theor
Integrating Digital Tools in Project-Based Learning To Enhance Nursing Students’ Critical Thinking Skills
Full text linkCritical thinking is essential for nursing students to ensure evidence-based decision-making and safe clinical practice. However, many students struggle with English academic reading, which limits their ability to develop these skills. This mixed-methods study explored nursing students’ perceptions of technology-assisted Project-Based Learning (PjBL) in enhancing critical thinking and collaboration. Thirty-five final-year nursing students engaged in group-based critical reading tasks using digital tools such as Google Translate and ChatGPT. Quantitative results showed significant improvement in critical thinking scores, rising from low (10) to medium-high levels (18–24), though progress was inconsistent. Qualitative findings revealed challenges related to limited vocabulary, grammar, and confidence, alongside benefits of collaborative learning and digital support. These findings align with Paul and Elder’s intellectual standards and the community of inquiry framework, emphasizing the need for structured strategies that integrate technology, academic literacy, and affective support. Practical implications include incorporating guided critical reading, digital literacy training, and differentiated scaffolding into nursing curricula to prepare students for global healthcare contexts
ANALISA PENGARUH VARIASI TEMPERATUR DAN WAKTU TAHAN PADA PROSES POST WELDING HEAT TREATMENT BAJA AISI 1020 TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO
Full text linkABSTRAK
Penelitian ini bertujuan untuk menganalisis pengaruh fluktuasi temperatur dan waktu penahanan proses post-welding heat treatment (PWHT) terhadap sifat mekanik dan struktur mikro baja AISI 1020. Variabel parameter PWHT meliputi suhu (825°C, 875°C, 925°C) dan waktu tinggal (1, 2, 3 jam). Pengujian ini dilakukan terhadap sifat kekerasan dan analisis mikrostruktur menggunakan mikroskop optik. Hasil penelitian menunjukkan bahwa peningkatan suhu dan waktu tinggal PWHT secara umum dapat menurunkan nilai kekerasan khususnya pada daerah logam las dan HAZ. Nilai kekerasan tertinggi pada area logam las diatur pada perubahan suhu 925 °C dan ditahan selama 3 jam, sehingga menghasilkan nilai kekerasan rata-rata sebesar 246,26 HVN, sedangkan nilai terendah pada area logam las diatur pada perubahan suhu 825 °C dan ditahan selama 2 jam, yang setara dengan nilai kekerasan rata-rata 146,02 HVN, yang merupakan nilai tertinggi pada area HAZ. Nilai terendah pada rentang HAZ ditujukan pada variasi temperatur 825 °C dan ditahan selama satu jam sehingga menghasilkan nilai kekerasan sebesar 88,05 HVN. Hal ini terjadi akibat adanya proses transformasi mikrostruktur menuju fasa ferit dan perlit yang lebih stabil. PWHT juga menghasilkan struktur mikro yang lebih homogen dibandingkan kondisi tanpa perlakuan panas. Fluktuasi suhu dan waktu penahanan PWHT terbukti mempengaruhi distribusi kekerasan dan sifat mikrostruktur baja AISI 1020. Oleh karena itu, pemilihan parameter PWHT yang tepat diperlukan untuk mencapai sifat mekanik yang optimal dan meningkatkan kualitas sambungan las.
Kata kunci: PWHT, baja AISI 1020, kekerasan vickers, struktur mikro, SMAW
PENGARUH PERSENTASE LARUTAN DAN WAKTU PERENDAMAN TERHADAP LAJU KOROSI DAN LIFETIME BAJA S45C
Full text linkABSTRAK
Korosi merupakan proses degradasi logam yang terjadi secara alami akibat interaksi elektrokimia antara material dan lingkungannya. Penelitian ini bertujuan untuk mengevaluasi pengaruh variasi konsentrasi larutan NaCl (70%, 80%, dan 90%) serta durasi perendaman (10, 20, dan 30 hari) terhadap laju korosi dan umur sisa (lifetime) baja S45C. Pengujian laju korosi dilakukan menggunakan metode kehilangan massa berdasarkan ASTM G31-72, sedangkan perhitungan lifetime mengacu pada standar API 570. Hasil penelitian menunjukkan bahwa laju korosi terkecil sebesar 0,048739 mpy diperoleh pada konsentrasi 70% dengan durasi 10 hari, sedangkan laju korosi terbesar sebesar 0,121847 mpy terjadi pada konsentrasi 90% pada durasi 10 dan 30 hari. Sebaliknya, lifetime tertinggi mencapai 14.943 tahun dan terjadi pada variasi dengan laju korosi terendah, sementara lifetime terendah sebesar 5.977 tahun dijumpai pada variasi dengan korosi tertinggi. Temuan ini menunjukkan bahwa peningkatan konsentrasi NaCl dan durasi perendaman cenderung mempercepat korosi dan memperpendek umur pakai material. Hasil penelitian ini diharapkan dapat menjadi acuan dalam pengendalian korosi pada penggunaan material baja di lingkungan yang bersifat korosif.
Kata kunci: Baja S45C, Immersion, Laju korosi, Lifetime, NaCl, ASTM G31-72, API 57