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Muhammad Afief Ma'ruf
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Fakultas Teknik Universitas Lambung Mangkurat, Jl. Ahmad Yani Km. 35 Banjarbaru Kalimantan Selatan Telp. (0511)-4773868 Fax. (0511)-4773868
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INDONESIA
Info-Teknik
Published by Universitas Lambung Mangkurat
ISSN : 08532508     EISSN : 24599964     DOI : http://dx.doi.org/10.20527
Core Subject : Engineering,
Engineering
Jurnal Info – Teknik menerbitkan artikel – artikel karya orisinil dan signifikan pada Bidang Rekayasa Teknik.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 430 Documents
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MECHANICAL PROPERTIES OF NATURAL FIBER COMPOSITE MADE OF INDONESIAN GROWN SISAL Jauhar Fajrin
INFO-TEKNIK Vol 17, No 1 (2016): INFOTEKNIK Vol. 17 No. 1 2016
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v17i1.1264

Abstract

Sisal fiber is one of the most widely used natural fibers and is very easily to be cultivated. Sisal is considered to be indigenous to central and south America. According to FAO, nearly 4.5 million tons of sisal fiber is produced every year throughout the world. Brazil and Tanzania are the two main producing countries. Indonesia and Thailand are two of the South East Asian countries that also produces sisal. This paper presents a comprehensive experimental work on the fabrication and characterization of epoxy composite reinforced with Indonesian grown sisal. The sisal fiber was specifically grown in Lombok, Indonesia. The composite laminate was fabricated using vacuum bagging process. The characterization processes were conducted to evaluate the the mechanical properties which includes tensile, flexure, shear and compressive properties of such composites. The results showed that the mechanical properties of the examined sisal-epoxy composite in this study has a comparable properties with some of the previous reported studies. The epoxy composite reinforced with unidirectional oriented sisal (UOS) fiber has the tensile, flexural, shear and compressive stress of 40.25 MPa, 62.16 MPa, 23.26 MPa and 60.88 MPa, respectively. While the epoxy composite reinforced with randomly oriented sisal (ROS) fiber has the tensile, flexural, shear and compressive stress of 22.52 MPa, 51.5 MPa, 22.34 MPa and 49.12 MPa, respectively. The results have clearly shown that epoxy composite reinforced with unidirectional oriented sisal fiberhas a better mechanical properties than epoxy composite reinforced with randomly oriented sisal fiber.
Studi Performansi Pada Peta Kendali Variabel Dengan Pendekatan Rantai Markov Mastiadi Tamjidillah
INFO-TEKNIK Vol 6, No 1 (2005): INFOTEKNIK VOL. 6 NO. 1 2005
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v6i1.1671

Abstract

Many products which are non-conforming with specification from company decision require the development and improvement of control chart to investigation and problematic analyzing. One of tool that used to get information of improvement action is control chart variable with Markov Chain analysis to increase of performance plywood product quality.To acquire information about variable of control chart with Markov Chain analysis can be watched on ARL value, data plotted pattern and calculating of loss function because of scatter pattern, and alternative for selling with discount price in domestic market. All the indicator or output above must be compared by indicator or output control chart  Shewhart. From analysis of variable of control chart performance before the improvement action resulted value ARL is 7,4 % and 1,60 %. Then decrease of loss function Rp. 32.000,- and Rp 16.000,- and after the improvement action resulted value ARL is 5,74 % and 1,55 %, and decreasing of loss function is zero. Pattern plots the data can you said in-control. In the relation with selling alternative using by discount price that explained with finance standard, so that benefit can be excepted than scrapped the alternative are selected.
POLA ARUS DI KOLAM PASANG SURUT AKIBAT PENGARUH ANGIN Achmad Rusdiansyah
INFO-TEKNIK Vol 7, No 1 (2006): INFOTEKNIK VOL. 7 NO. 1 2006
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v7i1.1693

Abstract

The Characteristics of water quality in shallow water of the pool of the rise and fall of the tides depend on the movement of stream flow.  Thus, on the first stage is the analysis of stream pattern and velocity.  The stream in pool of the rise and fall of the tides is influenced by the tides movement, besides, it can happened because of the side effect of winds blow.  The influence of the winds blow with a velocity will give forces on the water surface such as shearing force, and for the result, it push the water mass so the stream movement happen, witch is stated in the continuity and momentum equations.The stream pattern flow and velocity result can be examined by making a two dimensional (2-D) hydrodynamic of numerical model. The model is based on the numerical solution of continuity and momentum equations, which are solved with finite different method, the explicit of Mac Cormack method.The validity of model is tested with model experiment, 1-D stream flow and 2-D stream flow simulations with rectangle stream pattern.  The experiment is done in the pool of the rice and fall of the tides.  The results of the study had given satisfactory result.
STUDI PENGUKURAN KECEPATAN ALIRAN PADA SUNGAI PASANG SURUT Indra Setya Putra
INFO-TEKNIK Vol 16, No 1 (2015): INFOTEKNIK VOL. 16 NO. 1 2015
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v16i1.211

Abstract

Tidal river is one of the water resources which require proper management to be used as human needs such as irrigation and raw water. It required data such as discharge or velocity and water level. Until this period standard for measuring the velocity is just arranged in non-tidal rivers with SNI 03-2414-1991. This research aims to examine ways to measure water velocity in tidal rivers and provide recommendations for the design of new SNI for measuring the velocity of the tidal rivers.Methods used is by conducting velocity measurements performed in two rivers namely the Kapuas and Katingan by dividing the cross section into 3 sections and the time interval is 1 hour. Measurements were made using a 5 point in depth (d), are 20 cm, 0,2d, 0,4d, 0,6d, 0,8d which further results are elaborated and analyzed. It also carried out measurements of water level for 15 days with intervals of 1 hour.The results of this study are 8 requirements for the selection of the measurement location, 2 requirements for a long time and period measurement, 4 hydraulic conditions that must be considered at the time of measurement and 3 recommendations.Keywords : rivers, tidal, velocity measurement.
Penentuan Koefisien Transfer Massa Ekstraksi Pektin dari Buah Pepaya dalam Larutan HCl Hesti Wijayanti
INFO-TEKNIK Vol 8, No 1 (2007): INFOTEKNIK VOL. 8 NO. 1 2007
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v8i1.1723

Abstract

Indonesia has a great potency of papaya. As long as technology growth and demand in daily needs, its potency can be developed to get more value. One of the best ways is to extract pectin from papaya.This research conducted in order to obtain mass transfer coefficient in pectin extraction from papaya with HCl solution in stirred tank. Variables observed are extraction temperature, stirrer velocity and diameter of papaya powder.Extraction started by heating solution in batch reactor until wanted temperature achieved. Afterward turned on the stirrer motor with certain velocity. During the reaction, the temperature and the velocity of stirrer motor were kept constant. Sample was taken when certain time is reached.From this research, we got relation between mass transfer coefficient in pectin extraction from papaya with HCl solution in stirred tank and its influence variables, that could be written on this equation : = 1.033Or :Sh      = 1.033 ( Re)0.716 (Sc )0.291 ( db/dp )-0.066with average relative error 3.2702 %.
STUDY KINETIKA PERURAIAN PARTIKEL PADA PEMANFAATAN LIMBAH AMPAS TAHU DAN KOTORAN SAPI SEBAGAI MATERIAL PEMBUATAN BIOGAS Ni'mah, Lailan
INFO-TEKNIK Vol 15, No 1 (2014): INFOTEKNIK VOL. 15 NO. 1 2014
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v15i1.231

Abstract

The increasing energy demand and the depletion of fossil fuel reserves caused the waterwheel crisis, it is necessary for innovation to generate alternative energy sources. One of the alternative energy is biogas which can be produced from solid waste of tofu production (SWTP). Utilization of solid waste of tofu production (SWTP) to produce biogas can reduce energy consumption from fossil fuels while reducing the accumulation of garbage because so far most of the solid waste of tofu production (SWTP) directly discharged into the environment. Biogas is produced through a process that involves the breakdown of organic material activity of anaerobic microorganisms are bacteria methanogens in a anaerobic reactor (biodigester). Tofu production waste has high acidity so that it needs a buffer in biogas production. One of the buffer which can be utilized is cow manure.The experiment as many as 800 ml of sample was  entered to the reactor with the capacity of 1 L, then incubated in an anaerobic condition in the room at the temperature of 25-30oC within 30 days. There are 8 variation apply in this research, they are KS:KT=100:0,75:25, 50:50,25:75 and 0:100 at VS of 3%, and KS:AT 50:50 at VS of 2%,4% and 5%. The measured parameter is the biogas volume, methane concentration, carbon dioxide concentration, the ratio of C vs N, total solid (TS) and volatile solid content (VS), volatile fatty acid (VFA),pH and temperature. The gas volume measurement was done every day using gasholder while methane concentration was measured by gas chromatography (GC).The experiment result shows that the composition of cow manure and SWTP at VS of 3% KS:AT = 50:50 shows the highest methane concentration compared to the other compositions. The mathematic model as first order of reaction rate equation can approach the experiment result. Keywords:solid waste of tofu production, cow manure, biogas, and biogas's production model.
KAJIAN MASTERPLAN DRAINASE PASANG SURUT KOTA BANJARMASIN Novitasari, Novitasari
INFO-TEKNIK Vol 9, No 2 (2008): INFOTEKNIK VOL. 9 NO. 2 2008
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v9i2.1750

Abstract

The growth ofBanjarmasinCitycause increase of water burden which must be dried and land used increase caused by city growth, it’s caused that incoming rainfall concentration into surface runoff and groundwater decrease. Garbage which change the water quality in river cause the river unable to again run its role as natural drainage system. The aim of this research is give an instruction of Matrix Program of Drainage System of Banjarmasin city by root causes program. It’s consisted of identify the problem, analysis, solution and planning program.Evaluate of drainage system of BanjarmasinCity, by comparing and analysis result of technical calculation with the condition existing, obtained result that channel of exiting drainage still be adequate. So drainage system in BanjarmasinCitydoesn’t have to see as diffraction (macro) and general, but have to handing as micro solution. Existing channel need the handling O&M, also require public participate in lowest-level of drainage system management. And also need the existence of integrated system from all stakeholder that is involved in drainage system management.
PENGARUH ARUS TERHADAP KEKERASAN HASIL PENGELASAN BAJA ST 60 MENGGUNAKAN PENGELASAN SMAW Ma'ruf Ma’ruf
INFO-TEKNIK Vol 14, No 2 (2013): INFOTEKNIK VOL. 14 NO. 2 2013
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v14i2.305

Abstract

The purpose of this study was to determine the effect of the current violence SMAW welds on weld metal, HAZ and base metal regions ST 60 steel using E6013 electrodes. This study uses eksprimental, hardness testing was conducted using the Rockwell B (HRB). Hardness testing with penetrator ball Ø 1/16 "with a 981 N load suppression (100 Kgf). Conclusion is that large currents affect the hardness of steel ST 60 welds using SMAW welding. Hardness of weld metal at the highest current 90 A, the area the highest hardness in the HAZ 90 A current and highest hardness of the parent metal in the current 70 A.
KEBERLAKUAN MODEL HB-GFT SISTEM n-HEKSANA – MEK – AIR PADA EKSTRAKSI CAIR-CAIR KOLOM ISIAN Agus Mirwan
INFO-TEKNIK Vol 11, No 1 (2010): INFOTEKNIK VOL. 11 NO. 1 2010
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v11i1.1767

Abstract

Liquid-liquid extraction in packed column is a process of liquid phase separation in which a liquid solution (the feed) is contacted with an immiscible or nearly immiscible liquid (solvent). This type of extraction is a kind of vertical column extraction type without agitator (unagitated column) besides spray column and plate column. Good operation of liquid-liquid extraction hardly influenced by solute transfer characteristic. This characteristic can be quantification with a value so-called with mass transfer coefficient. Mass transfer coefficient is importance in order to be known in scheme of liquid-liquid extraction column and the values can be searched by using estimation models of mass transfer coefficient either in dispersion phase and also continue phase.The aim of this research is to prove model applying Handloss-Baros - Garner-Foord-Tayeban (HB-GFT) at liquid-liquid extraction process using transparent column prototype and packing type of small sphere with various of flow rate continue phase and dispersion phase at circulation drop spread (Re = 10 - 200). From this research got that packing type, droplet size, and flow rate phase (dispersion and continue) gives influence that is enough significant to mass transfer process that expressed with overall mass transfer coefficient (KOD). Flow rate and composition each phase in inlet and outlet column data are analyzed by using gas chromatography equipment (GC) that showed more and more big dispersion phase (Qd) flow rate, mass transfer coefficient (KOD) more and more small. This caused that drop diameter measure along the length of packing column assumed to be same. And model applying HB-GFT for internal circulation drop dynamics (170<Re<200) is best combination in determination of KOD with deviation standard equal to 3,2%.
Pengaruh Kadar Air dan Enerji Pemadatan terhadap Hydraulic Conductivity Lempung yang Dipadatkan Arifin, Yulian Firmana
INFO-TEKNIK Vol 2, No 1 (2001): INFOTEKNIK VOL. 2 NO. 1 2001
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v2i1.449

Abstract

This research will observe the effect of water content and compaction effort to the hydraulic conductivity of Karang Pilang Surabaya Clay used for clay liner of municipal waste disposal area.In this research, clay was taken from Karang Pilang, Surabaya.  Clay was compacted with Standard Proctor and Modified Proctor Tests.  From each of them,five sample were prepared at different water content (wc apt),2 (two) at wc<wc apt (wet side).  In order to obtain the hydraulic conductivity (k) of the clay liner, falling head test using 0.005 N CaSO4 was carried out.The result showed that hydraulic conductivity of compacted clays with the increasw of water content until ± 4 % over wopt.  The hydraulic conductivity of compacted at wit side is lower than the clay compacted at dry side.  The increase of compaction effort increasing density of clay results in the increase of hydraulic condctivity significantly.  For different clays, higher density does not assurance lower hydraulic conductivity, the hydraulic conductivity is also influenced by plasticity of clays. 

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