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An Analytical Solution for Advection-Diffusion Equation with Advection–Dominated Term using Multiple-Scale Expansion Methods Sulaiman, Albert; Mubarak, Mubarak
Journal of the Physical Society of Indonesia Vol. 1 No. 2 (2025): October 2025
Publisher : The Physical Society of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35895/jpsi.1.2.123-135.2025

Abstract

In this study, we solved the advection-diffusion sediment transport equation by taking into account the settling velocity and employing a multiple-scale expansion to approximate the dominant advection. We obtained an analytical solution in terms of the Green’s function.  The model results showed that, during one tidal cycle, TSS was concentrated at the surface and eventually transported to the sea. The pattern of TSS distribution was consistent with both constant and linear time-dependent river discharge. The simulation revealed that the concentration of TSS offshore was higher than near the estuaries, in agreement with our observations.
Measuring the Impact of External Risk Factors on Costs for Drainage Construction Projects in Aceh-Indonesia Mahmuddin, Mahmuddin; Mubarak, Mubarak; Fachrurrazi, Fachrurrazi; Ziana, Ziana; Agus, Suci Tiara
Elkawnie Vol. 12 No. 1 (2026)
Publisher : Faculty of Science and Technology Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v12i1.21011

Abstract

Abstract: Infrastructure projects are always faced with uncertainty and risks, both from within and outside the project, including drainage projects. An understanding of the sources and impacts of risks is required for construction implementers to minimize the negative effects of these risks. One of the impacts commonly experienced by construction companies is the emergence of cost overruns, which can potentially lead to project failure. This study aimed to analyze the impact of risk on cost for external factors in the implementation of drainage projects in Aceh Province in 2021. Employing a mixed-method approach, primary data were gathered through the distribution of questionnaires to 52 respondents actively engaged in project implementation. The questionnaire was designed to collect information on the impact of risk on costs for 3 external factors, namely social (2 variables), government policy (2 variables), and disaster (4 variables). The impact of risks was assessed using the severity index (SI) analysis. The findings revealed eight external risk variables exerting an influence on the cost of implementing drainage projects in Aceh Province in 2021. The most substantial impact on cost was categorized as "moderate" and manifested in two variables: uncertain weather conditions (SI = 0.400) and flooding (SI = 0.388). Understanding the potential impact of risks on project costs, especially those originating from external factors, will make it easier for contractors to plan risk mitigation and ensure the project is completed on target. Abstrak: Drainase merupakan salah satu proyek infrastruktur yang tidak lepas dari risiko-risiko yang dapat memengaruhi tujuan proyek. Risiko pada proyek dapat berasal dari faktor eksternal yang berasal dari luar dan tidak berhubungan dengan kegiatan proyek, namun dapat berdampak pada pencapaian tujuan proyek. Penerapan manajemen risiko perlu diaplikasikan, utamanya berkenaan dengan pemahaman terhadap potensi risiko yang dihadapi dan dampak yang ditimbulkan. Pembengkakan biaya merupakan bentuk risiko yang sering terjadi dan dapat berakhir pada kondisi terburuk berupa kegagalan proyek. Tujuan penelitian ini adalah menganalisis dampak risiko terhadap biaya pelaksanaan proyek dari faktor-faktor risiko eksternal. Objek penelitian ini difokuskan pada proyek drainase di Provinsi Aceh yang dilaksanakan pada tahun 2021. Data penelitian ini diperoleh melalui penyebaran kuesioner kepada 52 responden yang terlibat dan berperan langsung dalam pelaksanaan proyek. Kuesioner disusun untuk mengumpulkan informasi dampak dari 3 faktor eksternal, yaitu faktor sosial (2 variabel), faktor kebijakan pemerintah (2 variabel) dan faktor bencana (4 variabel). Dampak risiko terhadap biaya diukur dengan analisis severity index (SI). Dari 8 variabel yang dianalisis, dampak risiko tertinggi yang ditemukan muncul pada 2 variabel dengan level dampak "sedang." Variabel-variabel tersebut adalah kondisi cuaca yang tidak menentu (SI = 0,400) dan banjir (SI = 0,388). Dengan mengenali potensi dampak risiko terhadap biaya, khususnya pada faktor-faktor eksternal, kontraktor dapat lebih awal bersiap dan merencanakan mitigasi risiko untuk memastikan proyek dapat diselesaikan sesuai dengan sasaran.
APLIKASI TEKNIK LOT SIZING PADA PROYEK GEDUNG LABORATORIUM KEBENCANAAN UNIVERSITAS SYIAH KUALA Erwin Lingga; Mubarak Mubarak; Cut Zukhrina Oktaviani
Teras Jurnal : Jurnal Teknik Sipil Vol. 11 No. 2 (2021): Volume 11 Nomor 2, September 2021
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v11i2.563

Abstract

Abstrak Salah satu faktor mempengaruhi kelancaran dalam pelaksanaan suatu proyek konstruksi adalah pengadaan material ke lokasi. Keterlambatan datangnya material konstruksi yang menyebabkan stockout persediaan material saat akan digunakan membuat pekerjaan menjadi tertunda. Hal ini secara tidak langsung dapat mempengaruhi total waktu pelaksanaan serta biaya proyek. Penentuan tingkat persediaan yang tepat dapat diaplikasikan dengan mengunakan metode Material Requirement Planning (MRP). Tujuan dari penelitian adalah untuk mengetahui ukuran pemesanan dan biaya pengadaan material yang paling efisien dari dua teknik lotsizing yaitu teknik Period Order Quantity (POQ) dan teknik Economic Order Quantity (EOQ) pada Gedung Laboratorium Kebencanaan Universitas Syiah Kuala (USK) di Kota Banda Aceh. Proses yang terdapat dalam MRP meliputi netting, lotting, offsetting, dan explosion. Metode MRP diterapkan pada proyek Gedung Laboratorium Kebencanaan USK, dengan menghitung jumlah kebutuhan material berdasarkan data Rencana Anggaran Biaya (RAB), Analisis Harga Satuan (AHS), dan jadwal pelaksanaan terhadap 28 (dua puluh delapan) material di lokasi proyek. Berdasarkan dari teknik yang dianalisa, teknik lotsizing yang menghasilkan biaya total paling ekonomis untuk semua material adalah teknik Periodic Order Quantity (POQ) dengan biaya sebesar Rp. 9.850.848.30, Sedangkan yang mempunyai biaya pengadaan material sangat tinggi ditunjukkan oleh teknik EOQ, Rp. 9.852.102.40, artinya biaya yang dikeluarkan lebih kecil yaitu Rp. 1.234.00 (97%). Kata Kunci: Gedung Universitas Syiah Kuala, Material Requirement Planning, Lotsizing, Period Order Quantity, Economic Order Quantity  Abstract One of the factors influencing the continuity running of a construction project is material procurement to the site. The delay in the arrival of construction materials which causes a stockout of material supplies when they will be used makes the work delayed. This can indirectly affect the total implementation time and project costs. by using the Material Requirement Planning method. The purpose of this study was to determine the order size and the most efficient material procurement costs from the two lotsizing inventory control techniques, namely the Period Order Quantity (POQ) and the Economic Order Quantity (EOQ) at Disaster Laboratory Building University of Syiah Kuala in Banda Aceh city. The processes contained in MRP is netting, lotting, offsetting, and explosion. The MRP method is applied to the Disaster Laboratory Building University of Syiah Kuala project, by calculating the amount of material needed based on the Budget Plan data, Unit Price Analysis, and the project schedule which includes its 28 materials. Based on the analyzed technique, the lotsizing technique that produces the most economical total cost for all materials is the Periodic Order Quantity (POQ) technique with a cost of Rp. 9,850,848.30, while those who have very high material procurement costs are indicated by the EOQ technique, Rp. 9,852.102.40, meaning that the costs incurred are smaller, namely Rp. 1.234.00 (97%). Keywords: Building University of Syiah Kuala, Material Requirement Planning, Lotsizing, Period Order Quantity, Economic Order Quantity
Co-Authors . Azmeri, . A.A. Ketut Agung Cahyawan W AA Sudharmawan, AA Abdullah Abdullah Abdullah Abdullah Afrianti, Novia Muja Afrini, Ida Mardhiah Afrizal Tanjung Afsar, Muhammad Ali Agus Mandar Agus, Suci Tiara Agusti, Dinda Roanna Ahmad Rifai Ahmad, Alianisa Aidil Fitriansyah Albert Sulaiman Alchamdani Alfa Taras Bulba Alfajri, Alfajri Alfiansyah Yulianur BC Alhuda, Nafisah Alifariki, La Ode Alwi, Ahmad Amaliah, Nur Syafitri Aminuyati Andrikasmi, Sukamarriko Andrina, Hanifaturrahmi Andriyani, Elfi Anni Zahara Putri Ansyar, May Nurmiati Apriliani, Mumut Apriyanto Apriyanto Aras Mulyadi Arifudin arifudin Arimaswti Arimaswati Aris, Pajri Armanda, Armanda Arniati, Dina Arta, Fandi Handika Astawa, Kadek Wiana Badia, Esti Bahrul, Hartina Bambang Bambang Basiluddin, Fadhlan Bintal Amin Butarbutar, Yesenia Nancy Olivia Chasanah, Iimmatul Chatarina Umbul Wahyuni Claudya, Sonia Glory Cut Zukhrina Oktaviani Darwis, Darnita Dessy Yoswaty Dewi , Novia Djaimi Bakce Efriyeldi, Efriyeldi Eldina Fatimah Elizal, Elizal Ella Meilianda Elsa Eka Putri Emilda Firdaus Erwin Azizi Jayadipraja, Erwin Azizi Erwin Lingga Fachrurrazi Fachrurrazi Fachrurrazi Fachrurrazi Fachrurrazi Fachrurrazi Fadhila, Mahdia Fadhliyah Malik Fahira, Adhita Fiky Fahrur Rozi Fandi Handika Arta Fathurrahman, Febri Fildayanti, Nunung Firdayana, Sunita Fitiansyah, Aidil Fitrawan, La Ode Muhammad Fitri, Devi Yulia Gisya, Gina Gunawan Mahara Habibullah, Ridwan Hade Mulyadi Hafizhah, Hafizhah Haiqal, Muhammad Rafi Halid, Nur Hatidjah Awaliyah Halik, Halik Hanies Ambarsari Haofu, La Ode Muhammad Hidayat Harianja, Ronitua Saut Marito Haryati Haryati Hasanah, Nur Uswatun Hilman, Seprian Humayra, Siti Ibdayanti, Dinda Rizka Iin Shabrina Hilal Ilham Ilahi Ilyas Y, Muhammad Ilyas Y., Muhammad - imadduddin, Imadduddin Indalifiany, Astrid Indri Wulandari, Indri Irham, Rais Tamim Irma Irma Irmawati Irmawati Irnawati Irnawati Irvina Nurachmi Jabbar, Asriullah Jahwara, Ibnu Habib Jufri, Dwi Arini Juwita, Diana Kana, Febrina Kasmira, Febriyanti Kesuma, Putra Aulia Khairunnisa, Nisrina Kurniati Kurniati kusnan, adius Lasaima, Hasyiatul Rahmi Lingga, Erwin Livi, Aldisa Sipti Lubis, Abdillah M. Farid Akbar Elzam Maatitawaer, Natasya Debora C Made Bayu Anggara, I Mahara, Gunawan Mahmuddin Mahmuddin Mahmuddin Mahmuddin Mahmuddin, Mahmuddin - Manik, Pilipus Fiter Mariatul Kiftiah Mastura, Cut Annisa Widya Sari Maulana, Fariz Maulina, Febriyanti Medyan Riza Mega Fatimah Rosana Mega Yunita Mei Fita Asri Untari Melas, Febi Betania Merian, Rena Dian Metananda, Arya Arismaya Misnah, Siti Muhammad Andika Prakarsa Muhammad Isya Muhammad JAMIL Muhammad Zainal Abidin Mukmin Mukmin musfichin, musfichin Muslifah, Wa Ode Musrifin Galib Musrifin Ghalib Mustaqim Mustaqim, Mustaqim Naari, Asnarwaty Nabilla, Lulu Nabilla, Lulu Mayna Nadeak, Paulinus Nainggolan, Robby Nasrudin Neni Hermita Ningsi, Nadila Puspita Ningsih, Aprilia Surya Nirwati, Andi Noprianda, Renza Novia Dewi Novriadi, Yoga Nur Hikmah Nur Illiyyin Akib Nurhadi Hodijah Nurhikma, Nurhikma Nurman Said Nursyirwani, Nursyirwani Nurul Malahayati Nurul Malahayati Nurul Qomar Okwani, Yustian Pahmiah, Pahmiah Pasaribu, Parlin S Pascayantri, Asniar Pinta Sari Pradana, Hangga Prakarsa, Muhammad Andika Prayitno, Betari Erlinda Puspita, Devi Putra, Agus Kuniawan Qur’ani, Qur’ani R, Nurcahyani Pratiwi Radiyah, Isna Rahayu, Faulia Fajar Rahman Rahman RAHMAT MULIADI, RAHMAT Rahmat, Aan Nur Rahmawati, Rahmawati Rahmawati, Riski Ramadhan, Alif Ridho Ramadhan, Fauzi Rambe, Pahala Roy rangki, la Ranti, Putri Rasak, Adriatman Reja Pahlevie, Ricky Ridwan Manda Putra Rifaldi Rifaldi, Rifaldi Rifardi Rifa’atul Mahmudah Rizky Triananda Rosmeydar, Rosmeydar Rusli, Nirwati S, Gunawan Said Fachreza Saida, dan Saidy, Emily Nur Saiful Husin Saiful Husin Sakti Hutabarat Salem, Sri Rahayu Saltar, Laode Saputri, Desmy Elviyanti Dwi Satyawira, Immanuel Grahan Deyon Sejati, Muhammad Imam Setiawan, Laode Wawan Seven, Diko Alafchan Shanty Komalasari, Shanty Sheptian, Zetvi Shorea Khaswarina Sida, Nurramadhani A. Sinaga, Ogesnain Sinaga, Rugun Sipahutar, Alan Nuari Sitorus, Gideon Dody Tama Situmorang, Ally Wibowo Sofia Anita Sofyan H. Siregar Sofyan Husein Siregar Solo, Dian Munasari Sriwanita, Capra Suhadi Suhadi Sukmadi, Arfiyan Sukurni, Sukurni Sulsiah, Sulsiah Suryani Suryani Susanty, Sry Sutikno, Sigit Syafruddin Nasution Syaiful Hadi Syarif, Wilman Syarifuddin Syarifuddin Tanjung, Doli Juni Setia Tengku Nurhidayah Thamrin Thamrin Tri Yolanda Ariska Tripoli Tripoli Ulfa Ulfa Ulva, Sitti Marya Vikri, Ahmad Vivi Oktaviani wahyuni wahyuni Wardi, Roni Wati, Reza Ambar Wawan Gunawan Widuri, Falsabila Y, Muhammad Ilyas Yasmin, Siti Zalika Yuldiati, Memi Yulia Hairina Yulia Hayati Yunia Shofiasti Yusmini, Yusmini Yusni Ikhwan Siregar Yusria Darma Zahra, Nurul Ziana, Ziana Zulfahnur, Zulfahnur Zulhamid Ridho Zulkarnain Zulkifli Halid Zulkifli Zulkifli Zulkifli, Munirah