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MEKTEK
Published by Universitas Tadulako
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Articles 145 Documents
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OPTIMASI AKTIVATOR DALAM PEMBUATAN KOMPOS ORGANIK DARI LIMBAH KAKAO Yanqoritha, Nyimas
MEKTEK Vol 15, No 2 (2013)
Publisher : MEKTEK

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Abstract

The purpose of the study is to determine the ability of the composting process composting time to examine the relationship to temperature, pH and levels of C, N, Ratio C / N, P using EM4 activator, MOD 71, sheep dungon cocoa waste biomass. The working principle of the study is to observe and analyze the decomposition ofbiomass wastes cocoa to different activators and observe the process of composting process variables for 7,14, 21, 28, 35, 42, 49, and 56 days with the analysis of temperature, pH and analyze levels of nitrogen (N),Carbon (C), Ratio C / N, and phosphorus (P). Results were obtained in accordance with the optimizationpoint of the graph N, C, Ratio C / N, and P. Then connected to the SNI table, suitable compost is compostactivator biomass using EM4, at 28 days with temperatures 54.88 0C and compost maturation is the 56dayof temperature 28 ° C with a pH of 7.46.Keywords: Biomass, activator, EM4, MOD 71
ANALISIS PERUBAHAN NILAI SUCTION AKIBAT HUJAN TERHADAP KESTABILAN LERENG Martini Martini
MEKTEK Vol 11, No 3 (2009)
Publisher : MEKTEK

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Abstract

Infiltration of rainfall into slope will have an effect on to condition of slope hydrology and more specifically to characteristic of slope soils, for example pore water pressure value, level of saturation, weight contents of soil, shear strength of soil. Pore water pressure value at dry soil condition or wet condition called as with pore water pressure value negatife or value suction. This suction value will tend to declines and in the end becomes equal to zero or bigger than 0 ( positive pore water pressure) in the event of change of the water content from condition unsaturated to saturated condition. Speed of value change suction becomes positive pore water pressure most influenced by rain intensity. Value suction which is quickest fastest changed at slope at foot of slope
STUDI KARAKTERISTIK HUJAN PEMICU LONGSORAN PADA RUAS JALAN TAWAELI-TOBOLI SULAWESI TENGAH Martini Martini
MEKTEK Vol 7, No 2 (2005)
Publisher : MEKTEK

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Abstract

Landslide is one of the most types of slope movements of soil\rock often occur in Indonesia and resulting in damages such as in agriculture land, highways, structures and even casualties. From the researches landslides often take place on the rainy season,as well as when the rain is falling or after the rain stopped. This research will be done in two phases. First phase is a numerical modeling to simulate and predict slope hidrological behavior in respon to rainfall. The rainfalls applied for modeling are high and low intensity that are £ 70  mm/hour and 20 mm/day respectively some hours until days. The rainfall modeling results is used  as the data for next phase that is slope stability analysis. Slope stability will be analiyzed at the initial condition, when raining and after the rain stopped. This research results the decreased of slope stability caused by the rain depends on the intensity and duration of the rain. The research obtains that the rain  intensity of 70 mm/hour is the most potential cause to trigg the landslide than goes of 20 mm/day, 30 mm/hour and 50 mm/hour
ABU BATUBARA SEBUAH KONSEP INOVATIF BAGI PRODUKSI BATA ABU ABU UNTUK MEMPEROLEH KEKUATAN TINGGI DAN AMAN TERHADAP LINGKUNGAN (A Literatur Study) Eisenring, Maryo Pitanda
MEKTEK Vol 15, No 1 (2013)
Publisher : MEKTEK

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Abstract

Several experiments have been conducted by using Fly Ash and some similar materials, such as lime, sand, gypsum, quarry dust, Fibre Glass for Bricks-making, which generally aims to get a high-strength brick, and safe for the environment. Fly Ash classified as a B-3 waste is a coal combustion residue generated from burning coal in Steam power plant. Because Fly Ash contains SiO2, Al2O3,P2O5 and Fe2O3, the levels are quite high; the nature of its cement characteristic (pozzolonic) is very good for the use of construction industry. In this paper Fal-G brick production process, uses of rap-trap bond in Fal-G brick masonry prism test study and from the economic point of view it turns out the use of hollow block Fal-G can saveconstruction costs 20 to 30 %. Observations, limitations and suggestions from the various regions have been described.Keywords: Fly ash, rattrap bond, prism test, environment, infrastructure, economy.
PENGARUH SIKLUS PENGERINGAN DAN PEMBASAHAN TERHADAP KUAT GESER DAN VOLUME TANAH Nurdin, Sukiman
MEKTEK Vol 12, No 1 (2010)
Publisher : MEKTEK

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Abstract

Dry and wetting cycle in tropical area are usual cycle with high intensity. Those usually affect soils to beshrinkage at drying condition. It can be determine by the decrease of soil moisture content. In other hand,swelling process will occur in wetting side that actually cause the increase of volume of soils due to watercontent. This phenomena should be can caused by several factors such as soils mineral, climate (intensity ofrain), humidity and gravitation. This study aims to explore the change of volume and shear strength of soilsdue to dry and wetting cycle.Shrinkage limits test shows that shrinkage limit of soils more than 12%, it can be conclude that the typesoils at Kalukubula regency have slightly swelling potential. At 2 days until 10 days in drying process, theshrinkage limit was 21.37% to 47.87% with soil’s volume change from 18.06% decrease to 6.06%. while inwetting process, the shrinkage limit of soils was 46.70% to 26.06% with soil’s volume change from 0.18%increase to 10.17%. Swelling test shows that the swelling potential of soils was lower that 0.5% to average(0.5%- 1.5%). Shear test results in drying condition had the value of cohesion (c) and soil friction angle (ø)higher than in wetting condition
ANALISIS PERBEDAAN PENAMPANG SEISMIK ANTARA HASIL PENGOLAHAN STANDAR DENGAN PENGOLAHAN PRESERVED AMPLITUDE Mukaddas, Abdul
MEKTEK Vol 7, No 3 (2005)
Publisher : MEKTEK

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Abstract

Landslide is one of the most types of slope movements of soil\rock often occur in Indonesia and resulting in damages such as in agriculture land, highways, structures and even casualties. From the researches landslides often take place on the rainy season,as well as when the rain is falling or after the rain stopped. This research will be done in two phases. First phase is a numerical modeling to simulate and predict slope hidrological behavior in respon to rainfall. The rainfalls applied for modeling are high and low intensity that are ï‚£ 70 mm/hour and 20 mm/day respectively some hours until days. The rainfall modeling results is used as the data for next phase that is slope stability analysis. Slope stability will be analiyzed at the initial condition, when raining and after the rain stopped. This research results the decreased of slope stability caused by the rain depends on the intensity and duration of the rain. The research obtains that the rain intensity of 70 mm/hour is the most potential cause to trigg the landslide than goes of 20 mm/day, 30 mm/hour and 50 mm/hour
ANALISIS RELASI PARAMETER PEMOTONGAN BAJA St 43 PADA MESIN BUBUT GDW LZ 350 Selleng, Kristian
MEKTEK Vol 12, No 1 (2010)
Publisher : MEKTEK

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Abstract

The aim of this research is to find out the correlations among cutting parameters, namely depth of cutting t(mm), cutting speed v (mm/min) and feeding s (mm/rev) of a steel St 43 on. Type of the lathe is GDW LZ 350.This research used experiment method.Data analysis results the below equation: t = (2,483 − 0,3936 ln V + 5,44 V − 0,863 V ln V ) e S
PERENCANAAN PELAT BANGUNAN GEDUNG DENGAN METODE MARCUS Maricar, Shyama
MEKTEK Vol 7, No 3 (2005)
Publisher : MEKTEK

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Abstract

This paper explained more circumstantial of planning lisp at a building by using Method of Marcus, load and bone volume of the lisp were calculated by using method Marcus. In this method, the flatten load is calculated using tables and the point load is calculated with formula and table.The result shows that by using formula 1,2 MD + 1,6 ML of combination load, the maximum encumbering values were obtained for Mlx, Mly,Mtx, Mty.From the reinforcement calculation, the reinforcement of field in x direction use Ø 12 – 150 mm and for the fulcrum use Ø 12 – 150 mm. In y direction, reinforcement of the field and the fulcrum use Ø 14 – 150 mm. For the convenience, The reinforcement with Ø 14 – 150 mm is used for x and y direction.
PENGENDALIAN SISA MATERIAL KONSTRUKSI PADA PEMBANGUNAN RUMAH TINGGAL Asnuddin, Andi
MEKTEK Vol 12, No 3 (2010)
Publisher : MEKTEK

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Abstract

Waste material controlling in home building is very advantage involving, (1) tightening of contruction fee,(2) finishing process and job easily, (3) supporting of building environmental friendly.Factors which become consideration to control waste material on home building are (1) planning of designof site and ground plan, (2) material allocation, (3) using kinds of material, (4) keeping place and (5) abilityof employers.In general, kinds of waste material which are taken in home building are (1) ceramics pieces, (2) waste woodfrom scaffolding and mould of concrete (sloof, column, beam), (3) iron pieces, and (4) bricks pieces.Waste material can not be controlled if it uses kind of materials which can not be ordered in few contentsuitable with need because it is related to container and low limitation order
ANALISIS PRESTASI TURBIN GT-1510 BORSIG PADA UNIT UTILITY KALTIM I Basri, Muhammad Hasan; Sam, Alimuddin
MEKTEK Vol 8, No 1 (2006)
Publisher : MEKTEK

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Abstract

This research aim to analyses how far labour capacity or performance from GT-1510 Borsig turbine in Kaltim-1 utility unit. From the analysis can such component to prediction from turbine of degradation of performance so that requaire to conducted action by turbine component replacement or treatment and also is when done by overhaul.

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