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All Journal Jurnal Teknologi Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Teras Jurnal Potensi : Jurnal Sipil Politeknik International Journal of Applied Technology Research Indonesian Journal of Forestry Research
Mujiman Mujiman, Mujiman
Program Doktor Bidang Keahlian Rekayasa Struktur, Fakultas Teknik Sipil dan Lingkungan Universitas Gadjah Mada.
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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ANALISIS LENDUTAN STRUKTUR PERKERASAN KAKU AKIBAT PENGARUH KADAR AIR TANAH DASAR Wahyu, Hendra; Sulaiman, Suherman; Mujiman, Mujiman
Potensi : Jurnal Sipil Politeknik Vol 20, No 1 (2018): Potensi: Jurnal Sipil Politeknik
Publisher : Politeknik Negeri Bandung

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Abstract

The research attempts to find the deflection on a concrete slab that functions as a layer on top of a rigid pavement, the strain occurring on the pulling part as an effect of subgrade water, and the effects of static quasi loads in the middle of the concrete slab. The research adopted the experimental method with a testing object of concrete slab with a size of 1.0 x 1.0 x 0,1 m placed on top of lean concrete layer and subgrade with the size of 1.0 x 1.0 x 0,035 m and 1.0 x 1.0 x 0.4 m, respectively. Quasi-static loads were placed upon 3 (three) variations of tested objects. Variation 1 is the placing of loads on top of a concrete slab with 30% water content of the subgrade dry weight; variation 2 is the placing of loads on top of a concrete slab with 40% water content of the subgrade dry weight; and variation 3 the placing of loads on top of a concrete slab with 50% water content of the subgrade dry weight. The findings show that the carrying capacity of the concrete slab decreases. Th maximum carrying capacities of the concrete slab were 82.5 kN, 62.33 kN, and 30.06 kN for variation 1, variation 2, and variation 3, respectively.
UNJUK KERJA LAMPU FLUORESCEN BALAS ELEKTRONIK DIBANDING LAMPU FLUORESCEN BALAS INDUKTOR Mujiman, Mujiman
Jurnal Teknologi Vol 5 No 1 (2012): Jurnal Teknologi
Publisher : Jurnal Teknologi, Fakultas Teknologi Industri, Institut Sains & Teknologi AKPRIND Yogyakarta

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Abstract

Lampu TL atau lampu fluorescen adalah tipe lampu yang memiliki effisiensi penerangan yang cukup tinggi sekitar 60 lm/watt. Namun effisiensi lampu TL terkurangi oleh rendahnya effisiensi pada balas induktor yang digunakan pada lampu TL ,dengan menekan pada pengaruh regulasi tegangan, koreksi faktor daya, kuat penerangan, besarnya arus dan konsumsi daya. Metode yang penulis lakukan penelitian ini, dengan cara merangkai dan melakukan pengujian lampu TL 20 watt, dengan balas induktor tipe BTA 220 V CSC-CE merk philip dan balas elektronik tipe YZ-EB 20 watt, 220 volt. Alat ukur yang diperlukan Wattavi 8647479581, Multi meter Sanwa AX-303 TR, Amper meter dan Lux meter serta Cos-Q meter CELSA-415 V. Pengujian dilakukan dengan mengatur tegangan pada nilai yang terendah pada saat lampu mulai menyala, kemudian dinaikkan disetiap interval 5 volt sampai tegangan mencapai 230 volt. Kata kunci: , , ,
PENGARUH PENAMBAHAN VERMIKULIT TERHADAP KUAT LENTUR BETON MUTU RENDAH DENGAN SIMULASI BANJIR AIR LAUT Syahril, Syahril; Mujiman, Mujiman; Prayogo, R Desutama Rachmat Bugi; Riandi, Muhammad Raihan; Uli, Pita; Artanti, Lintang D.; Shaputra, Muhammad Rio Eka
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol. 28 No. 2 (2023): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v28i2.5240

Abstract

The condition of high tides causing flooding or what is called tidal flooding is a condition that has a negative impact on the surrounding area, especially construction buildings. Construction buildings that are submerged in sea water can experience corrosion in the building structure. The addition or substitution of certain ingredients that can minimize the influence of minerals and salts contained in sea water, such as vermiculite, can be an alternative to this problem. Vermiculite material has the ability to absorb water and can extract heavy metal salts from water. This research was carried out by adding vermiculite to the concrete mixture at 0% (normal concrete), 12%, 24% and 36%, which was then tested on fresh concrete mixture (slump and bulk density testing). The test object used is in the form of a block with dimensions of 100mm × 100mm × 500mm. Concrete flexural strength testing was carried out on test objects that had been soaked using sea water and ordinary water as a comparison. The highest flexural strength value of concrete was in the mixture with a percentage value of 36%, namely 2.91 MPa for concrete submerged in sea water and 2.86 MPa for concrete submerged in plain water. The addition of vermiculite material can increase the flexural strength value of concrete along with the percentage level of the vermiculite mixture.
Design of Hybrid Energy System for Railway Application (Case Study of People Mover System in Doha, Qatar) Nugroho, Sri; Mauludin, Luthfi Muhammad; Sirait, Togar; mujiman, mujiman; Sofyan, Ahmad; Tohir, Toto
Jurnal Internasional Penelitian Teknologi Terapan Vol 4 No 1 (2023): April 2023
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v4i1.112

Abstract

This paper presents the conceptual design of hybrid energy system used in railway application. The hybrid system with batteries and energy storage double-layer capacitor is a new technology that is used under extreme climatic conditions, especially in daytime temperature up to 50°C, high relative humidity, dust and heavy rain. It is a combination of double-layer capacitors and traction batteries. It draws power both externally and from braking energy. In order to reduce CO2 emissions to the environment, energy-saving drives and energy storage are used. Also, in public transportation, Sitras Hybrid Energy System (HES), hybrid energy storage system for trams, has been developed which combines a double-layer capacitor with a nickel-metal hydride battery. The storage not only allows driving without overhead lines, it also enables braking energy to be recovered. A reliable cooling system is required to ensure that the performance of the battery and the capacitor storage is maintained for as long as possible. The results of finite element model showed the robustness for railway application. The computational model refers to proof of static and dynamic strength in accordance with EN12663. A cooling system for a tram using this innovative technology was designed and qualified for the "Qatar Education City People Mover System (PMS)" project.
Evaluasi Perkuatan Eksisting Bronjong Pada Kasus Kelongsoran Jalan Cisasawi, Kecamatan Parongpong, Kabupaten Bandung Barat Amalia, Dewi; Mujiman, Mujiman; Juarti, Ery Radya; Pudin, Apip; Ruchiyat, Iman
Teras Jurnal : Jurnal Teknik Sipil Vol. 12 No. 2 (2022): Volume 12 Nomor 2, September 2022
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v12i2.791

Abstract

Abstrak Jalan Cisasawi mengalami kelongsoran pada tahun 2020. Usaha penanganan kelongsoran telah dilakukan oleh warga, menggunakan Bronjong. Hanya saja, perencanaan perkuatan tersebut tidak memperhitungkan persyaratan yang berlaku. Agar tidak terjadi kejadian serupa, perlu dilakukan evaluasi terhadap perkuatan tersebut. Evaluasi dimulai dengan pengumpulkan data dengan cara pengukuran geometri lereng dan pengujian tanah. Analisis stabilitas dilakukan menggunakan software Geostudio. Evaluasi dilakukan di akhir untuk mengetahui apakah konstruksi perkuatan lereng eksisting tersebut cukup aman atau tidak. Dari hasil analisis didapatkan bahwa nilai SF dari lereng eksisting (sebelum adanya bronjong) sebesar 0,504. Kondisi ini sesuai dengan lapangan yaitu lereng mengalami kelongsoran. Hasil analisis stabilitas lereng setelah diperkuat dengan Bronjong adalah SF sebesar 1,014. Nilai SF ini tidak memenuhi yang disyaratkan SNI 8460-2017 faktor keamanan dalam kondisi gempa SF lebih besar dari 1,1 sehingga diperlukan alternatif perkuatan tambahan lereng. Alternatif perkuatan tambahan lereng dilakukan memperbesar dimensi bronjong. Dari hasil analisis perkuatan tambahan didapatkan SF sebesar 1,277. Kata kunci: Perkuatan lereng, longsor, bronjong, angka keamanan  Abstract Cisasawi Road experienced a landslide in 2020. Landslide handling efforts have been carried out by residents, in the form of strengthening gabions. However, the retrofitting plan does not take into account requirements. In order to avoid similar incidents, it is necessary to evaluate the reinforcement. This evaluation begins with collecting data by measuring slope geometry and soil testing. Stability analysis was performed using GeoStudio software. Evaluation is carried out at the end of the analysis to determine whether the existing slope reinforcement construction is safe enough or not. From the results of the analysis, it was found that the SF value of the existing slope (before the gabions) was 0.504. This condition is in accordance with the field, namely the slope is sliding. The result of slope stability analysis after reinforced with Gabions is SF  1.014. This SF value does not meet the required SNI 8460-2017 safety factor in earthquake conditions SF > 1.1 so that additional slope reinforcement alternatives are needed. An alternative to additional slope reinforcement is to increase the gabion dimensions. From the results of the additional reinforcement analysis, it was found that SF 1,277. Keywords: Slope reinforcement, landslide, gabion, safety factor
EFFECTS OF DRAINAGE DITCHES ON WATER TABLE LEVEL, SOIL CONDITIONS AND TREE GROWTH OF DEGRADED PEATLAND FORESTS IN WEST KALIMANTAN Astiani, Dwi; Burhanuddin, Burhanuddin; Curran, Lisa M.; Mujiman, Mujiman; Salim, Ruspita
Indonesian Journal of Forestry Research Vol. 4 No. 1 (2017): Indonesian Journal of Forestry Research
Publisher : Association of Indonesian Forestry and Environment Researchers and Technicians

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59465/ijfr.2017.4.1.15-25

Abstract

Currently, tropical peatland forests are under considerable pressure because of increasing deforestation and degradation of forests. In Kalimantan, degradation and deforestation of peatland forests are driven primarily by industrial logging, expansion of agricultural activities through primarily conversion of forests to agricultural land and oil palm plantations. By the establishment of intensive drainage, it can induce wildfires in peatland. Unmanaged drainage ditches will alter water table levels within the site adjacent to the drainage including to surrounding peatland forest. Water table assessments were conducted before and after peatland drainage on 2007/2009 and 2012/2015 in Kubu Raya, West Kalimantan. This paper studies the effect of drainage ditches into the peatland water table. Results show the establishment of drainage ditches on this peatland landscape lowered the water table by more than 3 times from ~11.7 cm (SE = 1.5, n = 5) to ~37.3 cm (SE = 2.1 cm, n = 26). The effect on the water table was in drier months of July-August. Lowering the water table level altered worst the soil micro climate, peat temperature and peat water content. The results indicate the land use changes in peatland with the establishment of drainage affects peatland water table currently. In the area of less than 500 m from the drainage, the water level tends to lower toward the drainage feature. Therefore, recovery of peatland forests should be initiated by managing the landscape hydrology (i.e. water table) to restore the ecosystem and to protect the remaining peat swamp forest.
Co-Authors Ahmad Sofyan Artanti, Lintang D. Burhanuddin Burhanuddin Curran, Lisa M. Dewi Amalia Dwi Astiani Ery Radya Juarti, Ery Radya Mauludin, Luthfi Muhammad Prayogo, R Desutama Rachmat Bugi PUDIN, APIP Riandi, Muhammad Raihan Ruchiyat, Iman S Syahril Salim, Ruspita Shaputra, Muhammad Rio Eka Sirait, Togar Sri Nugroho Sulaiman, Suherman Toto Tohir Uli, Pita Wahyu, Hendra