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MEKTEK
Published by Universitas Tadulako
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Core Subject : Education,
Education
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Articles 145 Documents
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ANALISIS FILTER INDUKTIF DAN KAPASITIF PADA CATU DAYA DC Sollu, Tan Surayani
MEKTEK Vol 12, No 2 (2010)
Publisher : MEKTEK

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Abstract

One of the main component of DC power supply is filter, which consist of inductor and capacitor, that has function to smooth out the ripples voltage so that it can be obtained stable pure DC signals. There are four types of filter with the same input condition analysed in the research, (1) inductive filter, (2) capacitive filter, (3) L-form inductive filter, (4) π-form capacitive filter. The obtained result indicate that capasitive filter output voltage is bigger and more stable than inductive filter. The biggest output voltage (9,21 Volt) and smallest ripples factor (r=0,0003) are resulted by π-form, capasitive filter. In the certain range, the greater of capacitansi value, the smaller of the ripple factor and the output sinyal is more stable.
A STUDY ON PATTERN DAMAGE OF FINGER JOINTS IN BAMBOO LAMINATED BEAMS Rivani, Agus
MEKTEK Vol 8, No 1 (2006)
Publisher : MEKTEK

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Abstract

The aim of this study was to know the pattern damage of finger joints in bamboo laminated beams. The dimension of laminated beams were manufactured in 1200 mm length, 140 mm deep and 50 mm wide, which consisted of horizontally laminate of 5 mm in thickness. The finger joint consisted of two variations that were horizontal and vertical directions. One variation of other beam was manufactured in the form of clear straight beams as comparator parameters. The bending shear test was conducted with a three-point static bending.The result of research indicated that the joint areas, which the parameter of glue spread have to influence on the strength. Consequently, degradation of strength occurs on all of adhesive jointed beam can reach 48%, while the optimum strength of jointed beams can reach 82% of clear straight beams. This research identify that the pattern damage of laminated beams tends on a mixed mode failure between tension and compression. The strength of vertically finger joint more effective than horizontally finger joint
PEMANFAATAN METODE HEURISTIK DALAM PENCARIAN MINIMUM SPANNING TREE DENGAN ALGORITMA SEMUT Alamsyah, Alamsyah
MEKTEK Vol 12, No 3 (2010)
Publisher : MEKTEK

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Abstract

Without a program, computer is just a useless box. In general, the search for the minimum spanning tree canbe divided into two methods: conventional and heuristic methods. Use of heuristic methods that are expectedto complete the minimum spanning tree problem with the search results are more varied and with a shortercalculation time.In the conventional method of logic that is used only by comparing the distance of each node and then findthe shortest distance. However, the weakness of conventional methods on the accuracy of the resultsobtained and the resulting error rate in the calculation. It would not be a problem if the data they need onlya little, by contrast with the number of points that a lot will cause increased levels of calculation errors anddecrease the accuracy.The results showed that the parameters of the number of ants (m) and maximum cycle (NCmax) provided amajor influence on the length of the cable and are consistent with the additional parameters α, β, ρ, ζ, and Qare used for the optimal solution. For the settlement in the case of graph seerhana who has 8 points with thenumber of ants (m = 15) and the maximum cycle (NCmax = 10) obtained an optimal solution to the cablelength by 149 meters with a time computation 0 ms, the optimal cycle 1 and the optimal solution by 60%.
KEGAGALAN DINI PERKERASAN JALAN AKIBAT PELAKSANAAN KONSTRUKSI Yunus, Ruslan M.
MEKTEK Vol 8, No 1 (2006)
Publisher : MEKTEK

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Abstract

Liability for construction failure is main issue in construction industry. Production process that involves many parties with various interests caused liability allocation for the construction failure to be complicated. One of cause premature failure is inappropriate between product and contract stipulation. This article aim to study in construction premature failure the study process through regulation analysis and previous research result related to cause premature failure during construction phase. The study found some problems which still require to be assured, and vital importance to be developed in UU No. 18 / 1999 about Construction Service as failure definition, period of liability, assessment criterion to failure still require to be developed to reduce assessor subjectivity, and level of compensation to the arising out costs and loss in failure case require to estimate.
PEMODELAN DAN PENGENDALIAN MOTOR DC MENGGUNAKAN SIMULASI MATLAB Arifin, Yusnaini; Amir, Ardi
MEKTEK Vol 12, No 2 (2010)
Publisher : MEKTEK

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Abstract

This study aimed to see how the response changes in the speed DC motor and the armature current at the time of starting and stopping. The method used is a simulation using matlab software. By using the data specification n =ωDripproof type DC motors as well as testing the obtained value of ωn =55.44 rad / sec and ξ =0.3518. Because value ξ smaller than one, then the DC motor has a characteristic of less damped (underdamped).
MODEL HUBUNGAN KECEPATAN – VOLUME – KEPADATAN ARUS LALU LINTAS PADA RUAS JALAN ARTERI DI KOTAPALU (Studi kasus: Jl. Trans Sulawesi Kota Palu) Mashuri, Mashuri
MEKTEK Vol 8, No 2 (2006)
Publisher : MEKTEK

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Abstract

There are three main traffic flow characteristics which are used to estimate the level of services of a road link, i.e traffic Speed (S), traffic Volume (V) and traffic Density (D). In Traffic engineering theory, three models are often used for modeling of traffic flow characteristics. They are Greenshield model, Greenberg model and Underwood Model respectively.The aim of this research is to find the relationship model between Speed characteristic (S) – Volume characteristic (V) – Density characteristic (D) on Trans Sulawesi street in Palu city. Collected data is volume and time distance of traffic passing on specific road segment . Time distance data is needed for finding speed of traffic data. For collecting of time distance data, we choice the segment is 50 m long.The result of this research indicates that the Greenshield model is most realistic model in study location
KONSEP PELESTARIAN PUSAKA SAUJANA DI KAWASAN LEMBAH BADA Mashuri, Mashuri
MEKTEK Vol 13, No 1 (2011)
Publisher : MEKTEK

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Abstract

Bada Valley, one of the areas in Central Sulawesi, is rich with its natural dan cultural resources that need tobe developed and conserved. This article presents the concept of concervation that could be adapted in thisarea. The concept is called ecomuseum which implements the balace and the integrity of three elements;heritage, the participation from the community and the activity in the museum. It also gives priority toecologi activity to develop the area as the living museum. Through this concept, ecomuseum is expected togive contribution to increase the quality of live for the local community in Bada Valley
STALLING LIMIT KOMPRESSOR STATOR KASKADE DENGAN BRITISH PROFIL 9C7/32,5 C50 PADA STAGGER 40 Marsan, Kennedy
MEKTEK Vol 9, No 1 (2007)
Publisher : MEKTEK

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Abstract

Stalling condition of stator cascade compressor using British Profile 9C7 / 32,5. C50 at stagger angle 40, has reach at angle of attack 16O, although the value of turning angles (12) and losses tend to stabilize. This matter because of the blockage effect on the blade corner, shares stream to concentration to the middle O, this phenomena causing the cascade cannot rising the pressure more. The stalling condition at stagger 40 dominated by the corner stall phenomenon
RESPON STABILITAS SISTEM YANG MENGGUNAKAN GOVERNOR KONVENSIONAL DAN GOVERNOR FUZZY LOGIC Arifin, Yusnaini
MEKTEK Vol 13, No 1 (2011)
Publisher : MEKTEK

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Abstract

This paper aims to know how the conventional and fuzzy logic governor respons by load/disturbance changeand how the plant can achieve steady state condition after the load/disturbance change. This research usedsimulation methode which analyze respons of plant using conventional and fuzzy logic governor. In thissimulation, load changed 0,05 pu and 0,5 pu respectively.This study showed that by increasing of loads, 0,05 pu and 0,5 pu, system using conventional governor willachieve steady state condition at the instant of 30 and 35th second and have frequency deviation -0,0024 puand -0,024 pu respectively. Whereas system using fuzzy logic governor will achieve steady at the time of 27thand 33rd second, with frequency deviation are -0,0004 pu and -0,0055 pu. Generally, system using fuzzylogic governor has better performance than system using conventional governor
THE CARTESIAN CUT-CELL METHOD IN TWO DIMENSIONAL FLOOD SIMULATION Herman, Rudi
MEKTEK Vol 9, No 1 (2007)
Publisher : MEKTEK

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Abstract

Two dimensional dynamic models have been increasingly used for river flood simulation. This commonly uses satellite remote sensor data, recorded on a rectangular (Raster) grid. There are many important features on a flood plain, such as hedges or buildings, which do not follow the grid lines. Irregular meshes can be used to follow these features, but converting raster data to this format involves a loss of detail. The Cartesian cut-cell (CC) method uses a rectangular mesh. The edges of irregular solid bodies are located precisely with sequences of vertex coordinates. Cut-cells, which lie on the edge, are given special treatment. This allows straightforward integration of grid and vector data, potentially within a GIS based framework. This paper introduces the semi permeable internal (SPIn) boundary cut-cell method. This allows the integration of permeable boundaries, such as hedges, into the model. To explore the impact of these features, a small scale river flood event, over a field featuring a hedgerow, is simulated

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