Handayanu Handayanu
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The ability of Avicennia marina (Api-api putih) to Uptake Heavy Metal of Chromium at Wonorejo Coastal in Surabaya Herman Pratikno; Harmin Sulistyaning Titah; Handayanu Handayanu; Bintang Respati Dwi Harnani
International Conference on Coastal and Delta Areas Vol 3 (2017): The 3rd International Conference on Coastal and Delta Areas
Publisher : International Conference on Coastal and Delta Areas

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The increasing of industries and population growth are the main sources of contamination in the river. Wonorejo river is one of rivers in Surabaya that flow to east coast Surabaya. Concentration of Chromium (Cr) at estuary of Wonorejo River was 0.0325 mg/L and it was 2.7761 mg/L in sediment in 2007. Meanwhile, Cr at east coast of Wonorejo was 0.418 μg/L, it was indicating that upper than standart for biota in sea, 0.005 μg/L (KepMenLH No. 51 tahun 2004). In this research will be measured concentration of Cr from sediment and roots of Avicennia marina at Wonorejo River estuary. And then, it was calculated Bio-consentration Factor (BCF) value of A. marina. Transect method was used to determine the sampling point of mangrove root A. marina and sediment at estuary of Wonorejo River. Mangrove and sediment roots were analyzed using the Atomic Absorption Spectrophotometer (AAS) method, previously samples of roots and sediments were extracted using the wet destruction method. Parameters supporting in this research were measured include temperature using thermometer, salinity using salinometer and pH using pH meter for sediment. Based on the results, the average concentration of Cr in the sediment in transect 1 were 47 mg/kg until to 66.5 mg/kg. The concentration of Cr in roots of A. marina were 28 mg/kg until to 92.25 mg/kg. The BCF value in A. marina were 0.89 to 1.35. Based on the BCF value, it indicated that A. marina was a hyperacumulator species for heavy metals of Cr. Keywords: Avicennia marina, BCF, coast, chromium, root, sediment
Analysis of Configuration of Stinger Angle with Depth Variation During Installation On Pipe Diamater 20" in Banyu Urip, Bojonegoro Imam Rochani; Juniavi Dini Kumala Putri; Handayanu Handayanu
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 1, No 2 (2017)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (575.404 KB) | DOI: 10.12962/j2580-0914.v1i2.7052

Abstract

The selection of subsea pipeline construction methods used depends on the environmental conditions and behavior of the pipe installation system which acquires a variety of loads during installation and may the result in failure. In this case the required angle stinger configuration is in accordance with the criteria to avoid overstress and local buckling on the pipe during installation, the variation of the depth of 15 meters, 18 meters, 20.65 meters, 21.25 meters and 22.25 meters can help analysis the stress on the pipe in each case. The pipeline is 23.4 km north of Bojonegoro. From the results of the analysis, it is known that the configuration of stinger angles used during installation for each water depth is 15 m with stinger angle 8.88 degree, 18.65 m stinger angle 8.88 degree, 20.65 m stinger angle 8.88 degree, 21.25 m stinger angle 8.88 degree and 22.25 m stinger angle 8.88 degree. The result of pipe stress on the overbend area has a value of 85.13% SMYS or 352.42 Mpa when the direction of wave comes 90 degrees, while the sagbend area of the pipe has a maximum stress of 51.01% SMYS or 211.2 Mpa when the direction of wave comes 180 degrees. Local buckling check results in all conditions show safe results during the installation process.
Analysis of the Effect of Welding Sequence Variations on Residual Stresses and Distortions for Welding Pressure Vessels Structures at PT. Petrokimia Gresik using the Finite Element Method Nur Syahroni; Bayu Iman Fatkurokhim; Handayanu Handayanu
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 1, No 2 (2017)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (534.184 KB) | DOI: 10.12962/j2580-0914.v1i2.7053

Abstract

The development of oil and gas industry technology has been very advanced, one of the implementation is to connect material materials to support oil and gas industry facilities. Residual stress may occur due to high temperature differences due to welding and also uneven heat distribution. This causes the material to become hard but brittle so that it may cause structural failure in the connection area. In this final project will be simulated welding pressure vessels to determine the structure of residual stresses that occur as well as the influence of Post Weld Heat Treatment on residual stress itself. The material used is aluminum and WPS data coming from the fabrication company. The simulation is divided into 2 steps: thermal and structural analysis. The value of the residual voltage of 1 to pathline pathline 3 is 189 MPa, 124.8 MPa, 100.76 MPa with distortion value of 40.43 mm. Then analyzed Post Weld Heat Treatment referring to AWS D1.1: 2000 to reduce residual stresses that occur. From the results of the Post Weld Heat Treatment value of the residual stress can be reduced significantly. After being treated Post Weld Heat Treatment with variations of temperatures of 200 C, 300 C The maximum residual voltage reduction occurs in pathline 1 to pathline 3 at 125 MPa, 93 MPa, 100 MPa.
Peningkatan Budaya Belajar-Mengajar Dan Reputasi Sekolah Melalui Penerapan Sistem Monitoring Pembelajaran Online Rudi Walujo Prastianto; Mahmud Mustain; Herman Pratikno; Handayanu Handayanu; Dwi Purnomo H, Zuhud Ubaidillah & Miftakh D.S
Adi Widya : Jurnal Pengabdian Masyarakat Vol 3 No 2 (2019): ADIWIDYA
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33061/awpm.v3i2.3350

Abstract

Inovasi teknologi untuk pendidikan mutlak dibutuhkan di era Revolusi Industri 4.0, karena teknologi digital dapat memberikan solusi terhadap permasalahan masyarakat di sektor pendidikan. Fleksibilitas, efektifitas dan efisiensi penggunaan teknologi yang tepat dapat menembus ruang dan waktu dalam menjembatani komunikasi antar para pemangku kepentingan dalam proses pendidikan. Penerapan sistem monitoring pembelajaran online sebagai kegiatan pengabdian kepada masyarakat oleh Departemen Teknik Kelautan FTK-ITS dengan mitra sekolah Al Uswah Surabaya, menjadi solusi terhadap sistem yang masih konvensional yang kurang efektif dan efisien serta rentan terhadap ketidakakuratan akibat kesalahan manusia. Pada akhirnya, dengan sistem ini dapat memperbaiki pelayanan dan kinerja, sehingga efektivitas dan efisiensi proses tersebut meningkat. Parameter penting yang direkam menjadi database oleh sistem monitoring pembelajaran terkait kehadiran siswa, kehadiran guru dan durasi waktu proses belajar mengajar dapat dianalisis secara statistik deskriptif. Fitur sistem yang mampu diakses orang tua siswa, bahkan dapat menjadi media promosi untuk meningkatkan reputasi sekolah serta peran serta orang tua/wali siswa dalam mendukung kesuksesan kegiatan pendidikan. Sistem elektronik ini tidak akan memberikan hasil optimum jika tidak diiringi dengan perubahan pemahaman dan perbaikan budaya belajar mengajar guru, siswa, serta manajemen sekolah. Atau sebaliknya, dengan kehadiran sistem ini secara tidak langsung dapat memaksa untuk terjadinya perubahan budaya belajar-mengajar ke arah yang lebih baik secara bertahap. Dalam penelitian ini parameter penting terkait kegiatan proses belajar mengajar selanjutnya dianalisis untuk menemukan hubungan yang mendukung hipotesis terkait peningkatan budaya belajar mengajar dan reputasi sekolah melalui penggunaan sistem berbasis teknologi komunikasi dan informasi ini.