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All Journal Rotasi Rekayasa Mesin Jurnal Desiminasi Teknologi Arena Hukum Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin Az Zarqa': Jurnal Hukum Bisnis Islam Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil Jurnal Vokasi Mekanika
Ari Siswanto, Ari
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Religion Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Engineering Law, Crime, Criminology & Criminal Justice Mechanical Engineering Physics Social Sciences Transportation

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SKALA PELAYANAN TAMAN-TAMAN DI KOTA PALEMBANG Mafra, Ramadisu; Siswanto, Ari; Iqbal, Maulid M.; Juliantina, Ika
JURNAL DESIMINASI TEKNOLOGI Volume 6 No. 2 Juli 2018
Publisher : UNIVERSITAS TRIDINANTI PALEMBANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (20.193 KB)

Abstract

Abstrak: Taman perkotaan adalah aset infrastruktur hijau kota yang ditujukan untuk memberikan keberlanjutan sosialbagi warga, terus dikunjungi, menjadi venue aktivitas dan interaksi sosial. Fokus penelitian untuk mengukur skalapelayanan taman. Penelitian bersifat deskriptif kualitatif dengan metode penelitian survey, berlokasi di Taman KIB,Kampus, dan JSC. Menggunakan teknik sampel insidental. Metode distribusi frekuensi dan pengukuran horizontaldistance digunakan untuk mengolah data, kemudian disajikan dalam bentuk tabel, gambar dan atau narasi untukmenginterpretasikan data tersebut. Hasil penelitian menunjukkan radius rata-rata pelayanan taman di kota Palembangberada pada rentang ± 4,40 km dari center spot taman. Pengunjung terbanyak berasal dari Kecamatan Ilir Barat – I(24,33%). Ketiga taman preseden telah mencapai skala pelayanan kota (KIB 93%, Kampus 57%, dan JSC 74%). KIBtelah menjadi venue aktivitas sosial (51%), tetapi belum menjadi venue interaksi sosial (0,42%), sedangkan TamanKampus dan JSC belum menjadi venue aktivitas sosial dan atau venue interaksi sosial.Kata kunci: skala pelayanan taman, radius, domisili, venue aktivitas sosial
Perbaikan Kekerasan dan Struktur Mikro Besi Cor Nodular 700 Fasa Ledeburitik dengan Pengaturan Media Pendingin dan Tempering Siswanto, Ari
ROTASI Vol 21, No 4 (2019): VOLUME 21, NOMOR 4, OKTOBER 2019
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (557.483 KB) | DOI: 10.14710/rotasi.21.4.224-230

Abstract

Penelitian ini dilakukan pada material besi cor nodular 700 yang memiliki fasa ledeburitik. Besi cor nodular 700 fasa ledeburitik memiliki kekerasan dan struktur mikro yang tidak sesuai ISO 1083. Untuk memperbaiki nilai kekerasan dan struktur mikro dilakukan proses perlakuan panas. Perlakuan panas yang dilakukan menghilangkan fasa ledeburuit pada temperatur austenisasi, kemudian didinginkan menggunakan media pendinginan yang bervariasi. Hasil variasi media pendingian dilanjutkan dengan proses tempering. Hasil perlakuan panas tersebut dilakukan pengujian kekerasan dan struktur mikro. Hasil pengujian menunjukan proses pendinginan media udara bebas dan dilanjutkan temper 550 0C menghasilkan nilai kekerasan dan struktur mikro sesuai ISO 1083.
Pengaruh Interlamellar Spacing Terhadap Nilai Kekerasan Besi Cor Kelabu Dengan Variasi Tembaga Siswanto, Ari
ROTASI Vol 22, No 1 (2020): VOLUME 22, NOMOR 1, JANUARI 2020
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.22.1.14-21

Abstract

Besi cor kelabu merupakan jenis besi cor yang mempunyai bentuk grafit serpih dan patahan kelabu. Besi cor kelabu banyak dipergunakan karena sifatnya seperti peredam getaran yang baik, mampu cor yang sangat baik, machinability yang sangat baik, murah dan sifat unik lainnya. Pemberian unsur paduan adalah salah satu cara untuk meningkatkan sifat mekanik besi cor kelabu. Pemberian unsur Tembaga mampu meningkatkan pembentukan grafit pada transformasi eutektik akan tetapi menurunkan pembentukan grafit pada transformasi eutectoid, sehingga meningkatkan jumlah pearlit. Peningkatan jumlah pearlit dapat teramati oleh pengujian SEM (Scaning Electron Microscope) yang ditujukan dengan jarak interlamellar spacing pearlit yang semakin rapat. Hasil pengujian kekerasan yang dilakukan dalam penelitian ini juga menunjukan peningkatan persentase jumlah Tembaga mampu menaikan nilai kekerasan. Sehingga dapat disimpulkan peningkatan persentase jumlah unsur Tembaga di besi cor kelabu membuat semakin rapat jarak interlamellar spacing serta terjadi peningkatan nilai kekerasan.
PENGARUH VARIASI TEMPERATUR FURNANCE BRAZING TERHADAP SIFAT MEKANIK DALAM PEMBUATAN GRINDING ROLL MATERIAL FCD 500 DAN NI-HARD1 Siswanto, Ari; Hanaldi , Kus; Purwadi , Wiwik; Nadi, M. Rizki Gorbyandi
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1639

Abstract

This research was conducted on nodular cast iron FCD 500 and white cast iron Ni-Hard1 in the manufacturing of grinding rolls. These rolls were joined together using the furnace brazing method, with CuZn 35 filler metal placed between the two parent metals. The pressure applied in this experiment was 26,000 N using a pressure aid. The assembled parts of the grinding rolls were heated in a muffle furnace with temperature variations of 900, 950, and 1000 °C, with a holding time of 120 minutes. The results of the furnace brazing process revealed that the grinding roll sample achieved the highest shear strength at a temperature of 900 °C, with a shear strength of 6.52 MPa. The observed low shear strength is due to the penetration bonding between the metals. This was confirmed by the line analysis test, which indicated no diffusion process occurring between the metals. As the holding temperature of the brazing furnace increased, the shear strength decreased, primarily due to the melting of the CuZn 35 metal at temperatures above 900 °C, resulting in micro porosity. During the furnace brazing process, changes were observed in the microstructure of the FCD 500 parent metal. There was an increase in the amount of pearlite fraction, which in turn increased the hardness value. Additionally, the microstructure of Ni-Hard1 changed from austenite to martensite, leading to an increase in the hardness value.
Penerapan ACFTA di Indonesia Perspektif Ekonomi Islam Siswanto, Ari
Az-Zarqa': Jurnal Hukum Bisnis Islam Vol. 3 (2011): Az-Zarqa': Jurnal Hukum Bisnis Islam
Publisher : Sharia and Law Faculty of Sunan Kalijaga Islamic State University Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/9kxv4g62

Abstract

Konsep pasar bebas pertama kali dirumuskan oleh Adam Smith yang kemudian terus dikembangkan oleh David Ricardo dan Frederic Bastiat. Sebagai sebuah sistem ekonomi, pasar bebas meniscayakan akan pengurangan peran pemerintah dalam satuan ekonomi, sebab dipercaya ekonomi pasar dengan sendirinya mampu mengatur mekanismenya sendiri (invisible hand). Pasar bebas yang mengidealkan pasar berlangsung secara suka rela bebas dari paksaan dan pencurian; ternyata pada akhirnya akan menimbukan segudang ketimpangan (inequality). Idealisme yang dirasa sangat mulia itu ternyata sebatas utopia belaka, pasar bebas pada kenyataannya tak seindah yang dibayangkan, karena bukan kesejahteraan yang terjadi melainkan ketidakadilan yang akan timbul di sana sini. Di Indonesia, "ruh" pasar bebas yang tertuang dalam penerapan ACFTA. Apakah Indonesia siap masuk dalam arus ACFTA? Sebab, Indonesia sejatinya belum siap untuk masuk dalam arus pasar bebas (ACFTA). Andaikan siap pun Indonesia masih tak sanggup berkelit dari regulasi perdagangan bebas di bawah GATT dan WTO sendiri, yang intinya menghilangkan intervensi pemerintah dalam pasar. Dari pemahaman ini, maka menganalisis sistem ekonomi pasar bebas yang mulai berjalan di Indonesia (ACFTA) dengan kaca mata ekonomi Islam begitu sangat diperlukan mengingat masalah ekonomi terkait erat dengan pemenuhan hajat hidup seluruh umat manusia. Oleh karena itu, dari analisis dampak penerapan sistem pasar bebas didapatkan satu simpulan, bahwa pelaksanaan pasar bebas yang saat ini digelar di Indonesia (ACFTA) tidaklah relevan dengan semangat ekonomi dalam Islam itu sendiri yakni keadilan.
ISU KESEHATAN DALAM SENGKETA IMPOR DAGING AYAM ANTARA INDONESIA-BRAZIL DI WTO Siswanto, Ari
Arena Hukum Vol. 14 No. 1 (2021)
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.arenahukum.2021.01401.2

Abstract

AbstractThis paper discusses the issue of human health protection as one of the exceptions of GATT obligations, considering the elements in Article XX (b) of GATT are still general in nature and thus have the potential to bring different interpretation. Focusing on the elements of "necessary to protect human life or health" and "arbitrary or unjustifiable discrimination", this paper seeks to explore the various meanings of Article XX (b) GATT, including its implementation in an in concreto dispute, namely Indonesia's dispute with Brazil over chicken meat import policy. The result shows that the element of "necessary to protect human life or health" will be deemed if the state can demonstrate the existence of health risks, adopt necessary policies that mitigate such risks, and there is no other policy alternative more friendly to international trade available. In relation to the more subjective element of "arbitrary or unjustifiable discrimination", the principle of good faith has not yet given a place in the consideration of this element.AbstrakTulisan ini membahas isu perlindungan kesehatan manusia sebagai salah satu pengecualian dari kewajiban-kewajiban GATT, mengingat bahwa unsur-unsur dalam Artikel XX(b) GATT masih bersifat umum dan berpeluang memunculkan perbedaan penafsiran. Berfokus pada unsur “necessary to protect human life or health” dan “arbitrary or unjustifiable discrimination”, tulisan ini menelusuri berbagai pemaknaan terhadap Artikel XX(b) GATT, termasuk implementasinya dalam sengketa in concreto, yakni sengketa Indonesia melawan Brazil terkait kebijakan impor daging ayam. Hasilnya, unsur “necessary to protect human life or health” dianggap terpenuhi kalau negara itu bisa menunjukkan keberadaan risiko kesehatan, mengambil kebijakan yang mampu mengurangi risiko tersebut dan memang harus diambil, serta tidak tersedia alternatif kebijakan lain yang lebih ramah terhadap perdagangan internasional. Terkait unsur “arbitrary or unjustifiable discrimination” yang lebih subjektif, terungkap prinsip itikad baik belum mendapat tempat di dalam pertimbangan atas unsur ini.
Analisis Pengaruh Arus Listrik Pada Proses Pengelasan TIG Terhadap Kekuatan Sambungan Las Material Logam Aluminium 6061 Khalilulah, Ilham; Gunawan, Iwan; Siswanto, Ari
Jurnal Vokasi Mekanika (VoMek) Vol 6 No 4 (2024): Jurnal Vokasi Mekanika
Publisher : Departemen Teknik Mesin Fakultas Teknik Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v6i4.831

Abstract

The The selection of current in aluminum welding significantly affects weld joint quality. Excessively high current can lead to increased penetration, distortion, and overmelting. Conversely, low current may result in weak joints, insufficient penetration, and increased porosity risk. This study focuses on understanding the effect of current variations in the Tungsten Inert Gas (TIG) welding process on the strength of 6 mm thick aluminum 6061 welds using ER4043 filler. Tensile strength and flexibility are critical in construction, ensuring strong, stable, and durable welds to withstand static loads. The study found that a welding current of 160A achieved the highest tensile strength, averaging 207.49 MPa. In contrast, 100A yielded the lowest tensile strength at an average of 132.854 MPa, while 130A produced an intermediate average of 154.128 MPa. Bending test results showed that only the 160A weld met standard criteria, whereas welds with 100A and 130A currents exhibited cracks and fractures beyond acceptable limits. Microstructural analysis revealed that the Heat Affected Zone (HAZ) and weld metal at 160A were dominated by the Mg2Si phase, which significantly enhances the mechanical strength of the material. These findings highlight the importance of selecting the appropriate welding current for aluminum 6061. A current of 160A is recommended as the optimal choice to produce strong and reliable weld joints.
Pengaruh temperatur terhadap struktur mikro dan sifat mekanik dalam proses fussion brazing Ni-Hard 4 dengan S45C menggunakan CuZn 35 sebagai logam pengisi. Siswanto, Ari; Purwadi, W.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 10, No 1 (2020): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1040.799 KB) | DOI: 10.29303/dtm.v10i1.309

Abstract

This research was conducted on white cast iron (Ni-Hard 4) and medium carbon steel (S45C) cast iron materials using a thin brass plate (CuZn 35) 0.3 mm as filler metal by heating at temperatures of 850 to 1050 0C for 120 minutes with a pressure of 2 Mpa in the muffle furnace. The effect of temperature on the microstructure was observed using an optical microscope and scanning electron microscopy equipped with energy dispersive X-ray system (EDS) to determine the chemical composition that occurred between the three meterial layers. The thickness of the interface layer increases with increasing holding temperature. The highest shear strength (79.86 Mpa) was obtained at a temperature of 950 0C.
Analisis Tingkat Resapan Tanah Berdasarkan Pengukuran Permeabilitas Tanah pada Sub DAS Bendung Palembang Putri, Amalia Dwi; Saleh, Edward; Siswanto, Ari
Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil Vol. 14 No. 1 (2025): Cantilever
Publisher : Department of Civil Engineering and Planning, Faculty of Engineering, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35139/cantilever.v14i1.420

Abstract

The varying characteristics of soil in the Bendung watershed influence water infiltration processes, and soil permeability is an important indicator for assessing the soil's effectiveness in absorbing water. The relationship between permeability and water absorption capacity can help determine the risk level of waterlogging and flooding in the Bendung watershed. The study aims to analyze soil permeability variations in the Bendung watershed and their impact on flooding events. The method used is the Falling Head Test to accurately measure soil permeability at 14 locations, by measuring water height in a pipe inserted into the soil. Permeability values vary, with the highest value of 12.129 cm/hour in locations with sandy soil, while locations with clay content have lower permeability values, at 0.756 cm/hour. There is a connection between soil permeability and waterlogging. Soils with low permeability tend to cause water accumulation, increasing flood risk due to saturated soil. Conversely, high permeability indicates good water absorption capacity, as sandy soils have pores that effectively allow water to pass through. Soils with high sand content have higher permeability values, aiding water absorption in waterlogged areas. Clay soils have lower permeability and tend to cause waterlogging, increasing flood risk due to their saturated properties.
Identifikasi Sebaran Akuifer di Desa Geneng, Kabupaten Ngawi, Provinsi Jawa Timur Novianti, Yuniar; Saleh, Edward; Siswanto, Ari
Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil Vol. 14 No. 1 (2025): Cantilever
Publisher : Department of Civil Engineering and Planning, Faculty of Engineering, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35139/cantilever.v14i1.421

Abstract

Ngawi Regency is one of the largest rice-producing regions in East Java. However, this area faces challenges related to water availability due to relatively low rainfall, making adequate groundwater sources essential to support agricultural irrigation systems. Therefore, analyzing subsurface geological characteristics is crucial for mapping the presence and distribution of aquifers as one of the primary sources of irrigation water. This research uses the Vertical Electrical Sounding (VES) method using the Schlumberger configuration to identify water-bearing rock layers. Data acquisition was conducted at six measurement points located in dry areas to minimize potential bias caused by soil moisture or surface water. These six points form a rectangular area, allowing the development of one-dimensional and three-dimensional subsurface models using IP2WIN and RockWorks software, with adjustments based on regional geological conditions. The interpretation results show that the research area consists of clay layers, silt layers, and sand layers which are included in alluvium deposits (Qa), where the sand layer is indicated as an aquifer. The aquifer depth ranges from 5.3 to 75 meters, with thicknesses varying between 7 to 33 meters at each measurement point. This aquifer layer is confined between low-porosity clay and silt layers, indicating that the aquifer is likely to be classified as a confined aquifer.
Co-Authors Edward Saleh Hanaldi , Kus Ika Juliantina Iwan Gunawan Khalilulah, Ilham Maulid M. Iqbal, Maulid M. Nadi, M. Rizki Gorbyandi Novianti, Yuniar Purwadi , Wiwik Purwadi, W. Putri, Amalia Dwi Ramadisu Mafra, Ramadisu