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Project Based Learning on Casting of Aluminium Tensile Test Specimen for Mechanical Engineering Students, State Polytechnic of Malang on Odd Semester of Academic Year 2016/2017 Hadi, S.; Agustriyana, L.; Subagiyo, Subagiyo
Journal of Education Reseach and Evaluation Vol 1 No 1 (2017): February
Publisher : LPPM Undiksha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (628.98 KB) | DOI: 10.23887/jere.v1i1.9844

Abstract

The problem faced by students is the difficulty of understanding on metal casting topic in the lesson of Materials Technology which is conducted by lectures only. The research objective is to find out the improvement of score on metal casting topic for 1G students from Mechanical Engineering Department, State Polytechnic of Malang (Polinema) in odd Semester, Academic Year 2016/2017. Research method were facilitation of applied metal casting through pretest of metal casting, added a description of the design and modification of metal mould for Aluminium, visit to a home industry of Aluminium casting, students practice of Aluminium casting in a home industry, student groups presentation and discussion in the subtopics of (1) design and mould manufacture, (2) Aluminium casting practice, and (3) tensile testing with cast Aluminium specimen, as well as posttest on metal casting. The research result is an increasing in average score from 46.56 to 53.6 (22%) that means by adding the practice to the theory involved is increase a significant impact on understanding of Aluminium casting for students.
Potensi Bioaktif Peptida Hidrolisat Protein Undur-Undur laut (Emerita spp.) Menggunakan Analisis In Silico Romadhon, Romadhon; Sabdono, Agus; Subagiyo, Subagiyo; Triyanto, Agus; Riyadi, Putut Har
Buletin Oseanografi Marina Vol 14, No 1 (2025): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v14i1.69353

Abstract

Undur-undur laut (Emerita spp.) telah diteliti mempunyai kandungan gizi yang tinggi. Peptida dari hewan laut berpotensi besar dalam bidang kesehatan dan aplikasi biomedis, berkat aktivitas biologisnya yang beragam, seperti antioksidan, anti-hipertensi, antimikroba, dan perlindungan terhadap penuaan kulit. Teknik analisis in silico digunakan untuk mengidentifikasi peptida bioaktif dari protein sekuen dengan metode komputasi, seperti: database, aplikasi online dan software. Penelitian ini dilakukan untuk memprediksi peptida yang berasal dari undur-undur laut (Emerita spp.) dengan analisis in silico. Tahapan analisis in silico dilakukan menggunakan database NCBI dan dilanjutkan dengan analisis melalui software BIOPEP-UWM dan Peptide Ranker. Berdasarkan hasil analisis in silico pada hidrolisat protein undur-undur laut menggunakan BIOPEP, terdapat 16 peptida dengan potensi anti-hipertensi dan 14 peptida dengan potensi anti-diabetes. Berdasarkan hasil Peptide Ranker dapat dilihat urutan nilai probabilitas peptida yaitu kategori tinggi (WL, YF, AF, AW, IF, SF, ML, WT), kategori sedang (PR, AG, IG), dan kategori rendah (DP, HL, VPL, SL, NL, DR, AH, AI, VG, AEL, NT). Sekuen peptida yang tertinggi yaitu WL (Triptofan-Leusin) yang memiliki skor 0,99 dengan fungsi sebagai anti-diabetes. Sementara itu, nilai terkecil yaitu NT (skor 0,05) yang berfungsi anti-diabetes. Berdasarkan analisis sensori menggunakan BIOPEP, sekuen peptida yang dihasilkan tersusun atas asam amino yang memiliki rasa pahit dan manis. Peptida dan asam amino yang memiliki rasa pahit di antaranya : P, F, VF, IF, VY, V, VL, VI, L, IL, dan W, sedangkan yang memilki rasa manis di antaranya : P, G, dan V.
Isolasi Dan Karakterisasi Bakteri Asam Laktat Dari Usus Udang Penghasil Bakteriosin Sebagai Agen Antibakteria Pada Produk-Produk Hasil Perikanan Romadhon, Romadhon; Subagiyo, Subagiyo; Margino, Sebastian
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 8, No 1 (2012): Jurnal Saintek Perikanan
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (117.614 KB) | DOI: 10.14710/ijfst.8.1.59-64

Abstract

Lactid Acid bacteria are capable of fermenting sugars or carbohydrates to produce lactic acid in large numbers. The characteristics of lactic acid bacteria in general are cells reacted positively to the Gram  stain, catalase react negatively and do not form spores. And fermentation of glucose would result Iaktat acid. Isolation of lactic acid bacteria carried in the intestines of three species of shrimp that Tiger Shrimp (Penaeus monodon), shrimp Seker (Metapenaopsis sp.), Guts White shrimp (Penaeus merguensis). Selection of bacteriocin -producing lactic acid bacteria were in a qualitative and semi-quantitative (pitting) in MRS medium. Selected isolates were identified by morphological characteristics, biochemical, physiological, A number of 209 isolates were isolated from three species of shrimp. The results of the qualitative selection there were 54 isolates produced bacteriocins. The results of the quantitative selection of 54 isolates produced 24 fine isolates.  From the 24 isolates there are 2 isolates seed SFE-7 (33) and P12A (25). Characteristics of seed isolates had morphological characteristics of spherical shape, cell arrangement tetrad, gram positive, negative motility. While the results of the biochemical approach to gram-negative, catalase negative,  homofermentative (no gas in the fermentation of glucose), can ferment D-Galactose, D-Glucose, D-mannose, D-lactose. Physiological approaches to isolate growth SFE-7 (33) and P12A (25) can be generated that both isolates able to live in the range of 4 ° C to 50 ° C, in the range of pH between 4-10, and able to grow at levels of 5-10% NaCl . Based on these characteristics can be inferred featured isolates was Pediococcus acidilactici Key words: Lactid Acid Bacteria, intestine of shrimp, Pediococcus acidilactici
Design and Manufacture of Speedometer Covers using the House of Quality (HOQ) Approach Faizal, Elka; Sari, Nurlia Pramita; Wicaksono, Hangga; Pranoto, Bayu; Supriyanto, Nicky Suwandhy Widhi; Subagiyo, Subagiyo
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7119

Abstract

This study aims to design and fabricate a speedometer cover for Yamaha Aerox and N-Max 155 motorcycles using 3D printing technology, guided by the House of Quality (HOQ) framework. The increasing consumer demand for motorcycle accessories motivated this research. A structured design process was implemented, beginning with a consumer needs analysis conducted through questionnaires and surveys to identify user expectations. These needs were systematically translated into technical requirements using the HOQ method. The design stage utilized 3D CAD modeling and 3D scanning to ensure accurate fitting to the speedometer unit, followed by prototyping using fused deposition modeling (FDM) 3D printing. The final prototype exhibited key consumer-desired attributes such as heat resistance, structural durability, and a secure fit. Results indicate that integrating the HOQ approach with digital fabrication methods effectively aligns product design with user expectations. This study demonstrates the potential for further development of customizable motorcycle accessories using a consumer-driven and technology-supported design process.
Bioekologi Bulu Babi (Echinoidea) pada Ekosistem Padang Lamun Di Kecamatan Kupang Barat Klau, Fransiska Reni; Subagiyo, Subagiyo; Riniatsih, Ita
Jurnal Kelautan Tropis Vol 28, No 2 (2025): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v28i2.25627

Abstract

Sea urchins (Echinoidea) are one of the marine biota found in seagrass ecosystems in West Kupang District, East Nusa Tenggara. Sea urchins have an important role in the food chain cycle in seagrass ecosystems and are known as healthy food due to their high nutritional content. Sea urchin gonads contain protein, fat, vitamins and essential fatty acids, which are beneficial for human health. In addition to economic value, sea urchins also have ecological value in balancing and controlling macroalgae in coral reef and seagrass ecosystems. The aim of this research is to determine the bioecology of sea urchins in four research locations, namely Bolok, Lalendo, Baliana, and Tablolong beaches. The research method used was direct observation with Megabenthos and Benthos Belt Transect (BBT) techniques. The results showed that there were five types of sea urchins in the study site, namely Diadema setosum, Tripneustes gratilla, Echinometra calamaris, Echinothrix diadema, and Echinometra mathaei.   The results showed that the abundance of Diadema setosum individuals on Tablolong beach (0.46 ind/m²) while Tripneustes gratilla was dominant on Baliana beach (0.22 ind/m²). The highest species diversity index (D) was found in Lalendo (0,7) and the lowest in Tablolong (0,5), indicating moderate diversity. The uniformity index (E) was highest in Baliana (0.8) indicating a more even distribution of species than Tablolong (0.6), the dominance index (C) was highest in Lalendo (1.0), indicating a strong dominance of species at the site.   The highest Index of Gonadal Maturity (IKG) value for Diadema setosum was found in Tablolong (26.9), while Echinometra mathaei in Lalendo (68.6). The food consumption pattern of sea urchins showed that Tripneustes gratilla consumed more seagrass, especially at Baliana beach (82,08%), while Echinothrix diadema predominantly consumed seagrass at Lalendo and Baliana beaches.  Bulu babi (Echinoidea) merupakan salah satu biota laut yang banyak ditemukan pada ekosistem padang lamun di Kecamatan Kupang Barat, Nusa Tenggara Timur. Bulu babi memiliki peran penting dalam siklus rantai makanan di ekosistem lamun dan dikenal sebagai makanan yang menyehatkan karena kandungan nutrisinya yang tinggi. Gonad bulu babi mengandung protein, lemak, vitamin, dan asam lemak esensial, yang bermanfaat bagi kesehatan manusia. Selain nilai ekonomi, bulu babi juga memiliki nilai ekologi dalam menyeimbangkan dan mengendalikan makroalga di ekosistem terumbu karang dan lamun. Tujuan dari penelitian ini adalah untuk mengetahui bioekologi bulu babi di empat lokasi penelitian, yaitu pantai Bolok, Lalendo, Baliana, dan Tablolong. Metode penelitian yang digunakan adalah pengamatan langsung dengan teknik Megabentos dan Benthos Belt Transect (BBT). Hasil penelitian menunjukkan bahwa terdapat lima jenis bulu babi di lokasi penelitian yaitu Diadema setosum, Tripneustes gratilla, Echinometra calamaris, Echinothrix diadema, dan Echinometra mathaei. Hasil menunjukkan bahwa  kelimpahan individu Diadema setosum terrtinggi di pantai Tablolong (0,46 ind/m²) sedangkan Tripneustes gratilla dominan di pantai Baliana (0,22 ind/m²). Indeks keanekaragaman jenis (D) tertinggi ditemukan di Lalendo (0,7) dan terendah di Tablolong (0,2), menunjukkan keanekaragaman sedang. Indeks keseragaman (E) tertinggi di Baliana (0,8) menandakan distribusi spesies lebih merata dibandingkan Tablolong (0,6), Indeks dominansi (C) tertinggi di Lalendo (1,0), menunjukkan dominasi spesies yang kuat di lokasi tersebut.   Nilai Indeks Kematangan Gonad (IKG) tertinggi untuk Diadema setosum ditemukan di Tablolong (26,9), sedangkan jenis Echinometra mathaei tertinggi di Lalendo (68,6). Pola konsumsi jenis makanan bulu babi menunjukkan bahwa Tripneustes gratilla lebih banyak mengonsumsi lamun, terutama di pantai Baliana (82,08%), sementara Echinothrix diadema lebih dominan mengonsumsi lamun di pantai Lalendo dan Baliana. 
PELATIHAN ANALISA STRATEGI MANAJEMEN “BAGI BUMDES DESA WISATA TUGU SELATAN” Hamizar, Hamizar; Purwitasari, Maria Evy; Lutviani, Metya; Subagiyo, Subagiyo; Oktaviani, Featy; Syamsurizal, Syamsurizal
JURNAL ABDIMAS PLJ Vol. 5 No. 1 (2025): JURNAL ABDIMAS PLJ, Juli 2025
Publisher : POLITEKNIK LP3I JAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34127/japlj.v5i1.1631

Abstract

Village-Owned Enterprises, hereinafter referred to as BUMDes, are a village economic institution/entity that is a legal entity formed and owned by the Village Government, managed independently and professionally with capital that is wholly or mostly separated village assets. Ultimately, BUMDes was formed with the aim of increasing business opportunities in order to strengthen village autonomy and reduce unemployment. With Law No. 6 of 2014, the village government is given broader authority in terms of developing and empowering the economy of the village community in accordance with the potential, opportunities and capabilities of the village. However, many economic potentials of villages cannot be optimally utilized by the village to improve the economy and welfare of the community due to limited management strategies in managing BUMDes businesses and limited Human Resource capabilities in managing BUMDes. To achieve this goal, the Lecturers together with Students of the LP3I Jakarta Polytechnic held incidental training for the community and BUMDes Managers of Tugu Selatan Tourism Village in order to provide knowledge and understanding of SWOT analysis and Management Strategy so that it is hoped that the community and BUMDes Managers can further optimize the efforts that are currently being carried out and analyze how to make Tugu Selatan Tourism Village more advanced and developed and known by the wider community.
Geometry Optimization of PET Regrind Plastic Dust Separator Machine hartono, Moh.; Takwim, R.N. Akhsanu; Subagiyo, Subagiyo; Puspitasari, Etik; Alia, Nila; Nurvian Amrullah, Radhi
Evrimata: Journal of Mechanical Engineering Vol. 02 No. 02, 2025
Publisher : PT. ELSHAD TECHNOLOGY INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70822/evrmata.vi.76

Abstract

This study aims to analyze the effect of various operational factors on the weight of dust collected by a dust collector machine. Using a multilevel factorial design, this study evaluates the interaction between frequency (Hz), hose length (m), and tube height (m). Analysis of variance shows that all three factors have a significant effect on the dust weight response (P-Value <0.05). The regression model with an R² of 99.15% shows a very high prediction accuracy. Parameter optimization was carried out to maximize the weight of dust collected, resulting in optimal conditions at a frequency of 50 Hz, a hose length of 2 m, and a tube height of 0.3 m with a dust weight of 72.75 g.
Analisis Kesesuaian Wisata Berdasarkan Parameter Fisik di Pantai Pok Tunggal, Gunungkidul Firdaus, Shabriel Auliya; Nuraini, Ria Azizah Tri; Subagiyo, Subagiyo
Indonesian Journal of Oceanography Vol 7, No 3 (2025): Indonesian Journal of Oceanography
Publisher : University of Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijoce.v7i3.28756

Abstract

Pantai Pok Tunggal merupakan salah satu destinasi wisata alam di Kabupaten Gunungkidul yang memiliki potensi berupa hamparan pasir putih, tebing karst, dan ekosistem pantai yang masih alami. Namun, pemanfaatan kawasan ini belum sepenuhnya optimal dan belum didasarkan pada kajian kesesuaian wisata yang mempertimbangkan karakteristik fisik pantai. Penelitian ini bertujuan untuk mengidentifikasi karakteristik fisik kawasan, menganalisis tingkat kesesuaian wisata, dan mengevaluasi pemanfaatan ruang eksisting sebagai dasar pengembangan kawasan. Penelitian dilakukan di tiga stasiun pengamatan dengan menggunakan sepuluh parameter fisik pantai, seperti lebar pantai, kemiringan, kedalaman, arus, dan kecerahan air. Analisis dilakukan menggunakan metode Indeks Kesesuaian Wisata (IKW). Hasil menunjukkan bahwa karakteristik fisik Pantai Pok Tunggal umumnya mendukung aktivitas wisata, ditandai dengan pantai landai dan perairan yang relatif jernih. Nilai IKW berkisar antara 80,56% hingga 97,22%, dengan dua stasiun termasuk kategori sangat sesuai (S1) dan satu stasiun tergolong sesuai (S2). Meskipun potensi fisik kawasan tinggi, pemanfaatan ruang saat ini belum sepenuhnya selaras dengan karakteristik lingkungan. Oleh karena itu, pengembangan kawasan perlu diarahkan secara berkelanjutan dan berbasis daya dukung fisik pantai. 
The Hardness of Aluminum Oxide Surface in Anodized Coloring Under Low Voltage Buwono, Haris Puspito; Hadi, Syamsul; Muzaki, Mochamad; Subagiyo, Subagiyo; Agustriyana, Lisa; Hadi, Samsul; Nurchajat, Nurchajat
INTEK: Jurnal Penelitian Vol 6 No 2 (2019): October 2019
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (367.08 KB) | DOI: 10.31963/intek.v6i2.1522

Abstract

Coloring of aluminum oxide on the Aluminum type AA1100, which is the typical type for household appliances and purposes, through anodizing coloring process by the blue color of commercial printer ink had been successfully performed. The blue color was well adhered and was not easy to be removed by physical treatment such as wiping. The anodize coloring process includes chemical cleaning of aluminum surface, the formation of pores in the sulfuric acid solution at a specific current and a specified duration of time, coloring and closing the pores via sealing. It also shows the anodizing process increases aluminum oxide surface hardness increased by applying higher current density, and longer duration time of the process. The aluminum oxide hardness was in harmony to the duration of time processing, and current density; however, not in line to a concentration of the solution. The maximum hardness of the aluminum oxide layer obtained is 50 kg/mm2. The relation of current density and voltage, the effect of current density and sulfuric acid concentration toward aluminum oxide hardness were analyzed. Moreover, the difference of aluminum oxide hardness of the front side and backside to cathode also discussed.
Kajian Mikroplastik Pada Kerang Hijau (Perna viridis) dari Lokasi Budidaya dan Pasar di Kota Semarang Serta Efektivitas Depurasinya Fauziyah, Gina; Yulianto, Bambang; Subagiyo, Subagiyo
Buletin Oseanografi Marina Vol 14, No 3 (2025): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v14i3.69136

Abstract

Penelitian ini bertujuan untuk menganalisis kelimpahan dan karakteristik mikroplastik (MP) yang terakumulasi pada kerang hijau (Perna viridis) dari empat lokasi di Kota Semarang, serta mengevaluasi efektivitas depurasi dalam mengurangi kandungan MP. Penelitian dilakukan menggunakan metode deskriptif-analitik dan eksperimental. Sampel kerang dibedakan berdasarkan ukuran (kecil 2–5 cm dan besar >5 cm), masing-masing sebanyak 15 ekor dari setiap lokasi. Mikroplastik dianalisis menggunakan mikroskop stereo melalui teknik pencacahan visual, berdasarkan bentuk, warna, dan ukuran partikel. Depurasi dilakukan terhadap 15 ekor kerang dari lokasi budidaya Tambak Lorok selama 96 jam menggunakan sistem sirkulasi air laut yang telah didesinfeksi, dengan pengamatan setiap 24 jam. Hasil penelitian menunjukkan bahwa kelimpahan MP tertinggi pada kerang kecil ditemukan di BTL ST.3 (13.892,97 ± 6700,45 partikel/kg) dan pada kerang besar di PTL (14.469,49 ± 746,38 partikel/kg). Bentuk MP yang teridentifikasi meliputi fiber, film, fragmen, dan pelet, dengan warna dominan merah, cokelat, biru, dan hitam. Proses depurasi menunjukkan penurunan jumlah partikel MP dari 44 menjadi 6,8 partikel/kerang, dengan efektivitas sebesar 88,28% pada jam ke-96. Hasil ini menunjukkan bahwa kerang hijau di seluruh lokasi telah terkontaminasi MP, namun kandungannya dapat dikurangi secara signifikan melalui proses depurasi
Co-Authors Agus Sabdono Agus Triyanto Agus, Elsa Lusia Agustriyana, L. Agustriyana, L. Ahmad Fadli Aini, Fica Aida Nadhifatul Ali Djunaedi Ali Ridlo Amalia, Zakiyah Aninditia Sabdaningsih Bambang Yulianto Charisnalia, Charisnalia Damanik, Sonny Rieldo Dhaniswara, Erwin Eko Sasmaya Ervia Yudiati Etik Puspitasari, Etik Faizal, Elka Farida, Kania Faridha, Nike Fauziyah, Gina Firdaus, Shabriel Auliya Fitriadi, Ren Hamizar, Hamizar Hanan Setia Abadi Hanifah, Husna Haris Puspito Buwono HARIYANTO HARIYANTO Haromain, Achmad Herida, Azalia Puspa Hermin Pancasakti Kusumaningrum hidayat, dwi taufik Ibnu Pratikto Indah, Zuraedah Ita Riniatsih Jusup Suprijanto Kharisma Firdaus Linggarjati Klau, Fransiska Reni Kuswandi Kuswandi Langit, Novita Thea Puspita Larasati, Stefanie Jessica Henny Lisa Agustriyana Lutviani, Metya Mayestino, Alexander Machicky Moh. Hartono Muhammad Zainuri Muzaki, Mochamad Nasril, Nasril Nicky Suwandhy Widhi Supriyanto Nila Alia Nurchajat, Nurchajat Nurvian Amrullah, Radhi Oktaviani, Featy Pranoto, Bayu Purwitasari, Maria Evy Putra, Muhammad Juli Hendra Putut Har Riyadi R.N. Akhsanu Takwim, R.N. Akhsanu Rachman, Rhima Rismiyati Raden Ario Retno Hartati Ria Azizah Tri Nuraini Rini Pramesti Riskitasari, Septyana Romadhon Romadhon S. Hadi Samsul Hadi Sari Prabandari, Sari Sari, Nurlia Pramita Sarjito - Sebastian Margino Setiawan Setiawan Simanjuntak, Sri Devi Siti Duratun Nasiqiati Rosady, Siti Duratun Nasiqiati Rosady slamet budi prayitno Soedibya, Petrus Hary Tjahja Sri Wiwoho Mudjanarko, Sri Wiwoho Sudirman Sudirman Sunar, Sunar Surya Kencana, Dadang Suwandi, Nicky Syamsul Hadi Syamsurizal - - Talakua, Eddy Lybrech Talifatim Machfuroh, Talifatim Tardan, Herawati Wahyuningsih, Candra Wicaksono, Hangga Widodo, Radhian Wikanarto Witono Witono Ziah, Ainun