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All Journal Media Teknik Sipil Teknologi dan Kejuruan: Jurnal teknologi, Kejuruan dan Pengajarannya Jurnal Mahasiswa Jurusan Teknik Sipil Biotropika Rekayasa Sipil Jurnal Penelitian Pendidikan IPA (JPPIPA) INOVTEK POLBENG Jurnal Darussalam: Jurnal Pendidikan, Komunikasi dan Pemikiran Hukum Islam Mechanical Engineering for Society and Industry
Achfas Zacoeb
Jurusan Teknik Sipil Fakultas Teknik Universitas Brawijaya
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation Other

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PENGARUH FREKUENSI MESIN DAN JENIS TANAH PADA BESAR STRUKTUR PONDASI MESIN Ika Wulan Utami; Agoes Soehardjono; Achfas Zacoeb
INOVTEK POLBENG Vol 6, No 1 (2016): INOVTEK VOL.6 NO 1 - 2016
Publisher : POLITEKNIK NEGERI BENGKALIS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35314/ip.v6i1.49

Abstract

Abstrak Mesin dinamik yang pada penelitian ini adalah mesin reciprocating berupa kompresor reciprocating vertikal 4 silinder dengan pondasi yang digunakan adalah pondasi blok. Berat mesin yang digunakan 300 – 1700 kN dengan frekuensi mesin 300 – 1200 rpm. Pondasi mesin blok yang dianalisis dengan panjang 9 m, variasi lebar 4.5 m, 6 m dan 6.75 m dengan variasi berat 3x, 4x, 5x berat mesin dan embedded yang dipakai 50 %, 60%, 70%, 80% tinggi pondasi blok. Metode analisis yang digunakan adalah Elastic Half Space pada tanah kohesif sedang dan non kohesif sedang. Hasil analisis menunjukan untuk tanah kohesif sedang maksimum berat pondasi yang dapat ditanggung bebannya 1772.29 kN secara pembebanan statik dan 2647.80 kN untuk pembebanan dinamik pada frekuensi 300 rpm.  Berdasarkan rasio frekuensi pada tanah kohesif sedang, untuk pada frekuensi 300 rpm adalah sebesar < 149.67 kN , 685.77 – 1077.65 kN, 1869.94 – 1882.05 kN, dan  1900.23 – 2647.80 kN agar tidak terjadi resonansi. Sedangkan berdasarkan faktor magnification pada tanah kohesif sedang, berat pondasi sebesar  > 1049.3 kN pada frekuensi 300 rpm agar  pembesaran gaya dinamik yang berlebihantidak terjadi serta mampu ditanggung oleh jenis tanah kohesif sedang. Kata kunci : elastic half space, frekuensi, kompresor, pondasi blok, reciprocating
Teknologi Portable Inflated Greenhouse Sebagai Fasilitas Pendukung Peningkatan Ketahanan Pangan Dan Pertanian Perkotaan (Urban Farming) Ronny Durrotun Nasihien; Diah Ayu Restuti Wulandari; Achfas Zacoeb; Harimurti .; M. Ikhsan Setiawan
Jurnal Darussalam: Jurnal Pendidikan, Komunikasi dan Pemikiran Hukum Islam Vol 9 No 1 (2017): September 2017
Publisher : IAI Darussalam

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1281.08 KB) | DOI: 10.30739/darussalam.v9i1.123

Abstract

Agricultural Urban (Urban Farming) utilizing land intensification, in order to meet the needs of the fresh fruit and vegetables daily for the public residential/housing in urban areas. Portable Technology Greenhouse inflated as urban agriculture production support facilities, can be built and transferred to a residential location / specific housing is easy, safe, fast and lightweight (PVC 0,55mm Tarpaulin) so that urban agricultural products closer to consumers in urban settlements, the impact price getting cheaper, but quality. The long term goal is to develop protitipe Portable inflated Greenhouse as facilities Urban Farming which fulfills the power, speed, effectiveness, comfort and encourage crops of fruit / vegetable hydroponic hygienic, cheap and profitable, so that the product Portable inflated Greenhouse automatically support an increase in food production of the National, Specific target is the availability protitipe Portable Greenhouse inflated as Urban Farming facility in order to increase productivity of crops of fruit/vegetable hydroponic hygienic, cheap and profitable, so the high prospects for mass production in order to meet national food requirements. Methods using methods Experiments and Action Research, starting with the development of the design, manufacture, testing and repair of prototype Portable inflated Greenhouse includes (1) a test of strength and endurance of materials Portable inflated Greenhouse to weather, (2) test material Portable inflated Greenhouse most effective as a component of the structure, (3) test the speed of manufacture, transport, assembly, installation, dismantling Portable inflated Greenhouse, (4) the test temperature, humidity and air pressure within the Portable inflated Greenhouse, (5) test crops of fruit/vegetables hydroponically are suitable to be developed in inflated portable building a greenhouse in order to obtain yields hygienic, inexpensive andprofitable.The first year developing a prototype design Portable Greenhouse inflated, followed prototyping and ends with prototype testing and field trials at The Lab Narotama, published in the SeminarS/Proceeding International and International Journals indexed, filed a registration PATENT Kemenkumham.The results this research were published in the Appropriate Technology Seminar/Proceeding International and International Journals indexed, processed PATENT Kemenkumham, and is eligible to be mass produced to support the acceleration of National hygienic food production, cheap and profitable
CaCO3-Reformulated Interlocking Bricks: Physical Characterization and Their Antibacterial and Anti-Inflammatory Potential for Healthy Housing Djati, Muhammad Sasmito; Rachmawati, Turniningtyas Ayu; Anggraini, Retno; Zacoeb, Achfas; Rifa`i, Muhaimin; Minang, Bony Zulkarnaen; Kusuma, Kavana Hafil; Prima, Alex; Christina, Yuyun Ika
Biotropika: Journal of Tropical Biology Vol. 13 No. 1 (2025)
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.biotropika.2025.013.01.01

Abstract

Calcium carbonate (CaCO3) has many benefits for medicine, manufacturing, and nanotechnology due to its antibacterial and anti-inflammatory properties. Interlocking bricks (i-bricks) are widely used in sustainable housing for efficient air circulation and reducing humidity inside the house. If CaCO3 is mixed with interlocking brick, it can inhibit bacterial growth, leading to a healthier indoor environment. Therefore, this study aimed to investigate the physical characterization and antibacterial activity of CaCO3-reformulated i-brick, and its anti-inflammatory potential in mice infected with Salmonella typhimurium. The physical characterization of CaCO3-reformulated i-brick (F1-F10 formulas), including its density, compression, and absorption, was analyzed. The inhibitory activity of CaCO3-reformulated i-brick on S. typhimurium growth was determined using a linear regression equation between culture age and cell density values. BALB/c male mice were randomly divided into four groups (n=4): healthy mice (N), S. typhimurium-infected mice (S), S. typhimurium-infected mice treated with F6 formula (F6) and F7 formula (F7) for 7 days. After 7 days of treatment, lymphocytes were isolated to determine the relative number of TGF-beta, interleukin (IL)-10, and TNF-alpha using flow cytometry analysis. The results showed that formulas 6 and 7 of CaCO3-reformulated i-bricks exhibited optimal physical properties, including density, compression, and water absorption. These formulas also inhibited the growth of S. typhimurium. Furthermore, formulas 6 and 7 possessed anti-inflammatory effects in S. typhimurium-infected mice indicated by the high increase in IL-10 and TGF-beta production and low levels of TNF-alpha. In conclusion, CaCO3 brick formulation can inhibit the growth of S. typhimurium and exert an anti-inflammatory effect. Further investigation is needed to reveal the effect of CaCO3-reformulated i-bricks on another inflammatory marker to further elucidate its anti-inflammatory mechanism.
Advanced computational techniques for predicting 3D printing distortion in selective laser melting processes of Aluminium AlSi10Mg Choiron, Moch. Agus; Purnowidodo, Anindito; Zacoeb, Achfas; Setyawan, Gembong Edhi; Wirawan, Willy Artha; Ariadi, Yudhi; Rennie, Allan E.W.; Kurnianingtyas, Diva
Mechanical Engineering for Society and Industry Vol 5 No 1 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.12581

Abstract

Distortion for 3D printing using Selective Laser Melting (SLM) on AlSi10Mg aluminium is an important issue that affects the final manufactured product. This research aims to develop a finite element method (FEM)-based computational simulation and experimental validation to predict distortion in 3D printed products using SLM. The study results found that the variation of 3D printing position affects the resulting product's distortion and mechanical properties. The 90° part print position results in smaller distortion of 0.303 and 0.335 mm than the 0° part print position of 0.329 and 0.378, respectively, making it more suitable for high-precision applications. This study confirms the importance of scan orientation in controlling distortion in the SLM process, which can be used as a guide for optimal printing parameters. With proper orientation selection, the risk of distortion or defects in SLM products can be minimised, and industrial production efficiency can be improved.
Application of Risk Management Science in Construction Project Learning: Cost Contingency Study in Malang Raya Housing Qonitah, Fairuz Firyal; Zacoeb, Achfas; Anggraini, Retno
Jurnal Penelitian Pendidikan IPA Vol 11 No 7 (2025): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i7.11728

Abstract

Housing projects are classified as complex and therefore require risk management analysis for economic and business sustainability for developers. Objective: To apply the risk management science approach to understand the dynamics of contingency costs in real housing construction projects and relate it to strengthening student competencies in construction project-based learning. Method: This research is descriptive because it aims to provide an overview of the facts in the field and the observed phenomena regarding the analysis of dominant contingency cost factors in housing development projects in Malang Raya. Data analysis: Data was obtained through interviews and questionnaires, then analyzed on several factors that influence cost contingencies in housing projects. Results: The dominant factors influencing contingency costs in housing development projects in Malang Raya consist of four main factors: Design, financial, human resources, and engineering. The contingency costs in housing development projects in Malang Raya generally range from 5% to 7.5% of the total project value. Contingency costs are higher in type 36 and 45 housing projects, especially with DP below 20%. Solutions that can be implemented to address risks that cause contingency costs to arise include preventive and corrective actions tailored to each risk factor.
Impact of Friction Dampers on Seismic Performance: A Case Study of an Under-Designed Building Subjected to an Earthquake Abdurrahman, Yusril; Wibowo, Ari; Zacoeb, Achfas
Rekayasa Sipil Vol. 19 No. 3 (2025): Rekayasa Sipil Vol. 19 No. 3
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2025.019.03.9

Abstract

This study investigates the use of friction dampers to retrofit and enhance the seismic resilience of under-designed reinforced concrete buildings. A finite element model of a five-story reinforced concrete hospital, intentionally designed not to meet standard drift requirements, underwent nonlinear time history analysis. This analysis simulated two earthquake scenarios, with return periods of 225 (BSE-1E) and 975 (BSE-2E) years, considering soft soil conditions. The structure's seismic behavior was evaluated by analyzing key parameters such as base shear and inter-story drift ratio. The results showed that adding friction dampers significantly enhances the hospital's local and global structural performance in both earthquake scenarios. At the regional level, the dampers greatly decreased structural damage, eliminating plastic joints in the >CP category during the BSE-1E scenario and reducing them by up to 86.49% in the BSE-2E scenario. The dampers effectively reduced roof drift ratios at the global level, achieving a 45% reduction in the BSE-1E scenario. In the BSE-2E scenario, roof drift was kept below the Life Safety limit, with a 33.5% reduction. However, the dampers' effectiveness decreased as earthquake intensity increased, indicating limitations in their ability to manage scenarios beyond the initial design assumptions.
Co-Authors ., Fachreza Abdurrahman, Yusril Adam, Ariel Adison Aditya, Arch Adventus Kristian Tambunan Agoes Soehardjono Agoes Soehardjono Agoes Soehardjono M. D. Ahmad Rizqol Mahbub Alwan, Chotib Anindito Purnowidodo Anwari, Oryza Azizul Ari Wibowo Ari Wibowo Ariadi, Yudhi Arifi, Mohamad Fatchul Asenda, Dewa Chelievan, Aditya Christin Remayanti N. Christin Remayanti N. Danang Kurniawan, Danang Desy Setyowulan Diah Ayu Restuti Wulandari Edhi Wahyuni Edhi Wahyuni Setyowati Faradi, Dodi Fatkurotif Fatkurotif Fauzi, Ahmad Gembong Edhi Setyawan H. Santjojo, D. J Djoko Hakam, Fikri Arifuddin Harimurti . Harimurti . Harriani, Novi Dwi Hasyim, M. Hamzah Hasyim I Dewa Nyoman Yoga Prawira Ika Wulan Utami Ikhsan, Dito Muhammad Imran Jamaran Indradi Widjatmiko Kartika Purwitasari Kartika Puspa Negara Krisna Febrian Anugerahputra Kurnianingtyas, Diva Kusuma, Kavana Hafil Laksana, Fandy Setia Lilya Susanti Ludfi Djakfar M. Azharul Fikri M. Hamzah Hasyim M. Hamzah Hasyim M. Ikhsan Setiawan M. Taufik Hidayat MD, Agoes Soehardjono Minang, Bony Zulkarnaen Moch Sasmito Djati Moch. Agus Choiron Mochammad Surya Budi Utomo Muhamad, Gunawan Munir, Muhammad Syahrul Nugraha, Putra Adi Nursyahbani, Hanif O.K.A.N., Paradita Bagus Oktavianita, Yetty Partogian, Rio Hotman Permana Komardi, Riyan Ilmi Permana, George Rasyid Poerwadi, Mahmud Rekarifin Pramana, I Putu Leo Prastumi Prastumi Prayogi, Arie Prima, Alex Qonitah, Fairuz Firyal R. Santoso, Didik R., Nur Fatkhiyatur Rahardjo, Masaji Renhad Raharjo, Jovan Luke Rahman, Fuad Izzatur Rahman, Hilman Aulia Refandi, Ricky Rennie, Allan E.W. Retno Anggraini Retno Anggraini Rifa`i, Muhaimin Ristinah Ristinah Ristinah Ristinah Ristinah Syamsudin Robach, Choerur Roland Martin Roland Martin S Roland Martin S. Ronny Durrotun Nasihien, Ronny Durrotun Sagita, Filliyani Saifoe El Unas Saifoe El Unas Sinaga, William Swendy Siti Nurlina Soehardjono MD, Agoes Sri Murni Dewi Sri Murni Dewi Sugeng P. Budio Turniningtyas Ayu Rachmawati Utomo, Mochammad Surya Budi Wibowo, Satrio Agung Willy Aryansah Pratama P. Wirawan, Willy Artha Wisnumurti . Y L, Fajrina Zata Yuyun Ika Christina