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All Journal Jurnal Pendidikan Vokasi Jurnal Penelitian Saintek Inersia : Jurnal Teknik Sipil dan Arsitektur MEDIA KOMUNIKASI TEKNIK SIPIL Teknik Sipil dan Arsitektur Journal of Degraded and Mining Lands Management U Karst Civil Engineering Journal Jurnal Pensil : Pendidikan Teknik Sipil Journal of Engineering and Applied Technology Journal of Multidisciplinary Applied Natural Science Civil Engineering For Community Development Indonesian Journal of Aerospace Jurnal Teknik Sipil
Slamet Widodo
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation Other

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Effect of Steel Fiber on Plastic Hinge Length of Concrete Columns: Buckingham Theory Application . Tavio; Bambang Sabariman; Slamet Widodo
Civil Engineering Journal Vol 10, No 5 (2024): May
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2024-010-05-03

Abstract

The accuracy of designing the performance of concrete structures nowadays not only depends on the use of standard materials (cement, sand, and gravel) for certain concrete strengths but also on the accuracy of using additional materials for concrete, such as steel fiber. The use of steel fiber not only can improve the performance of concrete structures to behave in a ductile manner but can also form plastic hinges according to design purposes. The design of the axial load of Pa=0.121.Ag.f'c is based on the prediction of the column’s axial capacity. The columns were designed to behave in a flexural manner. As predicted, the lengths of the plastic hinges were found not too long. Controlling the length of plastic hinges in the design of structural concrete members is necessary to avoid excessive displacements. The control is mainly related to the prediction of the plastic hinge length. Thus, in this case, a plastic hinge length formula is required. In the study, the length of the plastic hinges of columns, which are confined with square stirrups and reinforced with steel fiber with Vf = 0%, 0.5%, 1%, 1.5%, and 2%, is proposed. This plastic hinge length formula is proposed after all column test specimens have met the displacement ductility requirement of mD>4, meaning that all test specimens are defined as very ductile. Doi: 10.28991/CEJ-2024-010-05-03 Full Text: PDF
Pembangunan Mushola sebagai Sarana Pendukung Tempat Wisata Taman Goa Jetis-Jatinom, Kabupaten Klaten Fajarwati, Yuli; Suwartanti, Suwartanti; Dewata, Hendra; Nugroho, Maris Setyo; Widodo, Slamet; Batuna, Nerizza Cheryl Salma; Nugraheni, Risa
Civil Engineering for Community Development (CECD) Vol 3, No 2 (2024): Edisi Oktober 2024
Publisher : Department of Civil Engineering Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/cecd.v3i2.29312

Abstract

Desa Wisata Jetis terletak di Kelurahan Jatinom yang memiliki upacara adat bernama Yaa Qowiyyu dan diselenggarakan setiap bulan Sapar. Taman Goa Jetis berada di Kawasan Makam Ki Ageng Gribig yang menjadi tempat berkembangnya Islam di Tanah Jawa. Goa yang terletak diantara dua taman tersebut saat ini dibuka untuk umum dan digunakan sebagai tempat berziarah. Dengan dibangunnya tempat wisata ini, dibutuhkan adanya sarana pendukung salah satunya tempat ibadah. Tujuan PKM ini yaitu pembangunan Mushola sebagai sarana pendukung dari Taman Goa Jetis ini. Pembangunan Mushola ini dilakukan dengan empat tahap, yaitu melakukan analisis masalah dengan mengobservasi lokasi pembangunan Mushola, melakukan perencanaan desain berdasarkan data observasi yang didapatkan, melakukan pendataan material dari desain yang dibuat, dan melaksanakan pembangunan. Pembangunan Mushola ini dilaksanakan oleh keterlibatan masyarakat setempat dan tim PKM. Kendala yang dihadapi selama pembangunan Mushola antara lain mobilisasi material, faktor alam, pengerjaan secara manual, dan keterbatasan alat.
ANALISIS THERMAL STRUKTUR SATELIT BENTUK SILINDER Slamet, Widodo
Indonesian Journal of Aerospace Vol. 8 No. 1 Juni (2010): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

The satellite temperature during its orbit has an extreme value. For this reason, we have to predict the temperature of the satellite structure. A satellite designer needs to analyze the structure temperature based on the heat transfers analysis. Two factorsare needed a view factor and a radiation coupling factor. The thermal distribution on a satellite with cylinder structure under extreme illumination of solar radiation will be analyzed upon its three walls: top, mantle, and bottom of the cylinder.
SIMULASI PANEL SATELIT MIKRO ISOGRIDALUMINA MENGGUNAKAN VISUAL NASTRAN 4D 2001 R2 Slamet, Widodo
Indonesian Journal of Aerospace Vol. 7 No. 1 Juni (2009): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

Struktur satelit memerlukan bahan yang ringan namun kuat. Salah satu penyusun struktur adalah lempengan atau plat. Salah satu cara modifikasi plat adalah bentuk isogrid, yaitu plat yang ditipiskan namun diperkuat oleh tulangan yang disebut rib. Makalah ini membahas hasil simulasi isogrid dari bahan aluminium. Simulasi menggunakan software Visual Nastran versi 4D 2001 R2. Hasil simulasi, diharapkan menunjukkan kemampuan isogrid menghadapi beban gaya roket.
Assessing the Magnetic Shielding Effectiveness of Low Carbon Steel, Permalloy, and Mu-metal on Small Satellite Reaction Wheel Assemblies using Finite Element Analysis Susilo, Hogan Eighfansyah; Budiantoro, Poki Agung; Fitrianingsih, Ery; Mayditia, Hasan; Nasser, Eriko Nasemudin; Farmasiantoro, Adi; Fauzi, Ahmad; Slamet, Widodo; Tahir, Andi Mukhtar; Pratiwi, Nindhita
Journal of Multidisciplinary Applied Natural Science Articles in Press
Publisher : Pandawa Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47352/jmans.2774-3047.354

Abstract

Magnetic cleanliness is essential for small satellites carrying sensitive payloads such as magnetometers and particle detectors. Reaction wheel assemblies (RWAs) represent a primary source of stray magnetic fields, requiring effective shielding under strict mass and volume constraints. This study uses three-dimensional finite element analysis (FEM) in ANSYS Maxwell to evaluate the shielding effectiveness (SE) of high-permeability alloys (Mu-metal and Permalloy 80) and low-carbon steels (AISI 1008/1010) at thicknesses of 1–3 mm, with aluminum 6061-T6 as a non-magnetic baseline, within a cylindrical RWA enclosure geometry. Results reveal a critical design trade-off: High-permeability alloys provide superior attenuation (>65 dB at 100 mm; residual field <150 nT) and high mass efficiency (>700 dB/kg) but saturate at low flux density (0.8 T) and are costly. Low-carbon steels offer moderate SE (34–40 dB) with far higher saturation tolerance (2.2 T), structural robustness, and lower cost. Thickness scaling shows diminishing returns beyond 2 mm for high-permeability materials, whereas steels improve more linearly. Rather than proposing a new shielding concept, this study applies an integrated FEM-based evaluation approach for small satellite platforms to consistently assess shielding effectiveness, nonlinear saturation behavior, thickness scaling, and mass efficiency of candidate materials within a reaction-wheel-representative geometry under identical boundary conditions.
Mobile microlearning with repeated short video access: Effects on vocational skill retention Putu Sudira; Rochmad Novian Inderanata; Slamet Widodo; Wagiran Wagiran; Sendi Tiyas Aryani
Jurnal Pendidikan Vokasi Vol. 15 No. 3 (2025)
Publisher : ADGVI & Graduate School of Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jpv.v15i3.95712

Abstract

This study examined whether mobile microlearning that enabled repeated access to short, SOP-anchored instructional videos improved vocational skill retention compared with conventional practice instruction. A quasi-experimental pretest–posttest–delayed posttest design was implemented with 80 undergraduate students in a practice-based course (experimental n = 40; control n = 40). The experimental group learned through segmented microlearning videos (2–6 minutes) aligned with procedural steps, safety checkpoints, and quality criteria, accessible via mobile devices for rewatching before and after workshop practice. The control group received conventional instruction through instructor demonstration and job-sheet guidance without structured video re-access. Data were collected using a validated SOP-aligned practical performance rubric, a procedural knowledge test, and an observation sheet documenting procedural errors and task completion time; perceived cognitive load was measured using a brief rating scale. Content validity was established through expert judgment and instrument refinement, and reliability was supported through inter-rater agreement for performance scoring and internal consistency for test and scale measures. Data were analyzed using descriptive statistics, Shapiro–Wilk normality tests, Levene’s homogeneity tests, and independent-samples t-tests to compare groups at pretest (baseline equivalence), posttest (immediate outcomes), and delayed posttest (retention outcomes). The results indicated that the experimental group achieved significantly higher delayed practical performance and procedural knowledge than the control group, with fewer procedural errors and faster completion time. These findings suggest that rewatchable SOP-based mobile microlearning can strengthen durable procedural competence in vocational practice settings. This study contributes empirical evidence to vocational education literature by demonstrating that structured, rewatchable SOP-based microlearning enhances durable procedural competence.
EFEK PENAMBAHAN SERAT LIMBAH BOTOL PET DAN FLY ASH TERHADAP HASIL UJI ULTRASONIC PULSE VELOCITY PADA SELF COMPACTING CONCRETE Rifki Alfirahman; Slamet Widodo
Teras Jurnal : Jurnal Teknik Sipil Vol. 13 No. 1 (2023): Volume 13 No 1, Maret 2023
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v13i1.795

Abstract

Abstrak Penelitian ini bertujuan untuk mengetahui pengaruh penggantian sebagian semen dengan fly ash dan penambahan serat plastik PET pada Self Compacting Concrete (SCC) terhadap karakteristik beton segar, kuat tekan beton, kecepatan rambat gelombang ultrasonik (UPV), dan modulus elastisitas dinamik. Penelitian ini termasuk dalam penelitian eksperimental yang dilakukan di laboratorium. Penambahan serat PET diberikan sebesar 0%; 0,25%; 0,50%; dan 0,75% berdasarkan volume fraction matriks beton. Sedangkan penggantian parsial semen dengan fly ash dilakukan sebesar 0% dan 15%. Terdapat delapan varian dalam penelitian ini. Masing-masing varian terdiri dari lima benda uji silinder berukuran 150×300 mm. Sehingga total terdapat 40 benda uji. Pengujian kuat tekan dan cepat rambat gelombang dilakukan saat benda uji berumur 56 hari. Pengukuran UPV dilakukan sebanyak lima titik setiap benda uji. Hasil penelitian menunjukkan bahwa kualitas campuran beton segar mengalami penurunan seiring dengan penambahan serat PET secara bertahap. Pada pengujian beton kondisi mengeras, penambahan serat PET cenderung menyebabkan penurunan kuat tekan, kecepatan gelombang ultrasonik, dan modulus elastisitas dinamik. Persentase penambahan serat PET pada campuran beton tanpa fly ash yaitu sebesar 0,50%, sedangkan pada campuran dengan subtitusi semen dengan 15% fly ash yaitu sebesar 0,25%. Kata kunci: Ultrasonic pulse velocity, kuat tekan, self compacting concrete, fly ash, serat plastik PETAbstractThis study aims to determine the effect of partial replacement of cement with fly ash and the addition of PET plastic fibers to Self Compacting Concrete (SCC) on the characteristics of fresh concrete, compressive strength of concrete, Ultrasonic Pulse Velocity (UPV), and dynamic modulus of elasticity. This research classified as experimental research conducted in the laboratory. The addition of PET fiber is given at 0%; 0.25%; 0.50%; and 0.75% based on the volume fraction of the concrete matrix. While the partial replacement of cement with fly ash was carried out at 0% and 15%. There are eight variants in this study. Each variant consists of five cylindrical specimens 150×300 mm. So in total there are 40 specimens. Tests for compressive strength and UPV were carried out when the specimens were 56 days old. UPV measurements were carried out at five points for each specimens. The results showed that the quality of the fresh concrete mix decreased with the gradual addition of PET fiber. In testing the hardened condition of concrete, the addition of PET fibers tends to cause a decrease in compressive strength, ultrasonic wave speed, and dynamic elastic modulus. The percentage of addition of PET fiber to the concrete mixture without fly ash was 0.50%, whereas in the mixture with cement substitution with 15% fly ash, it was 0.25%. Keywords: Ultrasonic pulse velocity, compressive strength, self compacting concrete, fly ash, PET plastic fiber
Co-Authors . Tavio Adi Farmasiantoro Agus Santoso Ahmed Wasiu Akande Alamsyah Prawiranegara Aniswara Dewi Bagas Habibilah Bambang Sabariman Batuna, Nerizza Cheryl Salma Budiantoro, Poki Agung Darmono Doni Prakasa Eka Putra Faqih Ma arif Faqih Ma&#039;arif Faqih Ma'arif Faqih Ma'arif Faqih Ma`arif Faqih Ma’arif Faqih Ma’arif Faqih Ma’arif Fauzi Ahmad Muda Fitrianingsih, Ery Galeh Nur Indriatno Putra Pratama Hendra Dewata Hidayat Mahardika M Fajar Amir Maris Setyo Nugroho Mayditia, Hasan Mohamad Tafrikan Mohamad Tafrikan Nasser, Eriko Nasemudin Nugraheni, Risa Nuryadin Eko Raharjo Pratiwi, Nindhita Putu Sudira Rifki Alfirahma Rifki Alfirahman Rochmad Novian Inderanata Sendi Tiyas Aryani Sri Haryono Suryatama Ageng Pamuji Susilo, Hogan Eighfansyah Suwartanti Tahir, Andi Mukhtar Teuku Faisal Fathani Wagiran Wahyu Wilopo Wisnu Rachmad Prihadi Yuli Fajarwati Zhengguo Gao Zhengguo Gao Zhengguo Gao