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INDONESIA
KURVATEK
Published by Institut Teknologi Nasional Yogyakarta
ISSN : -     EISSN : 24777870     DOI : https://doi.org/10.33579/krvtk.v4i1
Core Subject : Science, Social, Engineering,
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Social Sciences
Jurnal KURVATEK diterbitkan pertama kali tahun 2016 oleh Pusat Penelitian dan Pengabdian masyarakat pada Sekolah Tinggi Teknologi Nasional Yogyakarta. Jurnal ini mempunyai misi sebagai media pengembangan ilmu pengetahuan dan teknologi dalam bidang geologi, pertambangan, elektro, sipil, material teknik,konversi energi, enegi terbarukan, serta perencanaan wilayah dan kota. Area tulisan dalam jurnal ini cukup luas. Cakupan penulisan mulai dari kajian pustaka maupun ekperimen yang ditulis dengan kaidah-kaidah penulisan ilmiah yang baik dan benar.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 265 Documents
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PENGARUH WAKTU PENGELASAN TERHADAP REAKSI ANTARMUKA PADA SAMBUNGAN ALUMINIUM AL6061 DAN BAJA GALVANIS Sigit Edy Purwanto; Mustakim Mustakim; Triyono Triyono; Nurul Muhayat
KURVATEK Vol 4 No 2 (2019): November 2019
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v4i2.1147

Abstract

AbstrakBahan bakar merupakan kebutuhan yang sangat penting bagi alat transportasi. Saat ini, cadangan bahan bakar fosil semakin berkurang. Untuk menghemat bahan bakar diperlukan alat transportasi yang ringan. Konstruksi yang ringan dapat diperoleh dengan menggabungkan dua atau lebih jenis material. Jenis sambungan yang sesuai untuk mendapatkan konstruksi yang ringan adalah sambungan las. Penelitian ini bertujuan untuk mengetahui sifat mampu las antara baja galvanis dengan aluminium Al6061. Metode pengelasan yang digunakan adalah Resistance Spot Welding (RSW). Sifat mampu las dari kedua material dapat diketahui dari  jenis senyawa intermetalik yang terbentuk pada antarmuka lasan. Hasil penelitian ini menunjukkan bahwa reaksi antarmuka yang terbentuk untuk waktu pengelasan 4 dan 5 siklus adalah senyawa intermetalik FeAl dengan ketebalan masing-masing 19,25 μm dan 10,52 μm, untuk waktu pengelasan 6 siklus adalah senyawa intermetalik FeAl3 dengan ketebalan 8,07 μm. Kekeraran tertinggi 623,1 HV0.1 dan kekerasan terendah 572,2 HV0.1. Kata kunci: Aluminium Al6061, Baja Galvanis, RSW, Senyawa Intermetalik AbstractFuel is a very important in transportation. Unfortunately, the amount of fossil fuel reserve is decreasing. Using lightweight material for vehicle is one way to save fossil fuel. Lightweight construction can be obtained by combining two or more types of material. The right type of connection to get a lightweight construction is a welded joint. This study aimed to determine the properties of weldability between galvanized steel and aluminum Al6061. The welding method used was Resistance Spot Welding (RSW). The weldability of the two materials could be seen from the types of intermetallic compounds formed at the weld interface. The results of this study indicated that the formed interface reaction was FeAl intermetallic compound layer with a thickness of 19,25 μm and 10,52 μm respectively for 4 and  5 cicles of welding time, and FeA3 intermetallic compound layer with a thickness of 8,07 μm for 6 cycles of the welding time The highest hardness was 623.1 HV0.1 and the lowest hardness was 572.2 HV0.1. Keywords: Aluminum, Galvanized Steel, RSW, Intermetallic Compound
KAJIAN PENENTUAN LETAK SARINGAN PADA SUMUR BOR DAN DESAIN KONSTRUKSINYA DI AREA KAMPUS INSTITUT TEKNOLOGI SUMATERA (ITERA) Bilal Al Farishi; Muhamad Ragil Setiawan; Wijayanti Ashuri
KURVATEK Vol 4 No 2 (2019): November 2019
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v4i2.1180

Abstract

Clean water is a fundamental need for every kind of activities. ITERA as a university with various kind of learning activities cannot be separated from the need for clean water. Along with the rapid development of the campus, ITERA also requires a plan in order to provide clean water, one of which is by conducting a study of borehole construction design. This study was conducted because groundwater is one of the largest providers of clean water and must be managed properly. This study examines the shape of the construction and the right location of the filter on the borehole by looking at the geological and hydrogeological conditions and the position of the aquifer. Based on the study conducted, the geological conditions of the study area are in the Lampung Formation with the dominance of Tuff lithology. The position of the aquifer is found at a depth of 6.8 meters. Thus, the location of the filter in making bore wells should be at a depth of 20-25 meters and 40-50 meters. The filter made at these two depths is an anticipatory step if the groundwater drought during the dry season. Keywords: ITERA, clean water, aquifer, bore wells.
REKONSTRUKSI BIDANG GELINCIR LONGSOR DENGAN METODE GEOLISTRIK DI KAWASAN TAMAN NASIONAL TAIPINGSHAN, PROPINSI YILAN, TAIWAN Zamroni, Akhmad
KURVATEK Vol 4 No 2 (2019): November 2019
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v4i2.1184

Abstract

Taipingshan landslide occurred by Typhoon Saola in 2012. Rainfall recorded in that event occurred was over 1800 mm during three days. Additionally, geological factors such as weathered and erosion materials are also factors that give risk occur landslide. Geoelectrical resistivity is a geophysical method that uses an electrical current into the rock to get resistivity value. The function of geoelectrical resistivity is to determine materials in subsurface based on the resistivity value, which is done by measuring materials on the ground surface. The kinds of landslide material in this area is only one type of rock, it is slate. Differences of resistivity values (some colors in 2D resistivity image), due to several factors, such as weathered and fresh rock, fracture zones in the rock, and rock contacts with water. According to drilling data, 2D resistivity image, and geological map in Taipingshan, reconstruction of the subsurface profile was made to know the depth of potential mass wasting. The kinds of materials derived are colluvium at a depth of 0-10 m, weathered rock (slate) at a depth of 10-29 m, and bedrock (slate) at a depth of 29-100 m. The position of sliding surface was located between the weathered rock (slate) and bedrock (slate) at a depth of around 29 m. The sliding surface is obtained from two materials adjacent that has different contrast of resistivity value. So it is easily moving and eroded in steep slope and when heavy rainfall occurs. So that the thickness of potential mass wasting was around 29 m.
TEACHING STATISTIC USING MATLAB Yuliani, Oni
KURVATEK Vol 4 No 2 (2019): November 2019
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v4i2.1193

Abstract

This paper is to describe the use of Matlab as a scientific tool for the teaching of statistics in undergraduateschool. Application of this software in the teaching of some difficult topics like probability concepts, probabilitydistribution, statistical significance, and significance tests, were demonstrated using the Matlab. Matlab has proved it self to be a very effective tool in the educational process because it offers a simple and powerful tool for analyzing and visualizing results of numerical simulations and measurements.
OPTIMASI NILAI RESISTANSI PADA RANGKAIAN RESISTANSI KOMBINASI PARALEL-SERI YANG SETARA DENGAN NILAI RESISTANSI RUSAK MENGGUNAKAN ALGORITMA GENETIKA F.X. Wisnu Yudo Untoro
KURVATEK Vol 4 No 2 (2019): November 2019
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v4i2.1562

Abstract

This paper discusses the limited availability of resistance values used to obtain the resistance value of a damaged resistor. The proposal offered is to use a parallel-series combination resistance circuit form. To obtain the resistance values for a series of parallel-series combination resistor in order to produce a resistance value equivalent to the resistance value of the damaged resistor using a genetic algorithm. The simulation results show that by providing input in the form of resistance value of the damaged resistor of 75 ῼ, population number 10, number of generations of 50, as well as by input of genetic algorithm operators, between a 90% crossover probability, and 10% gene mutation probability an equivalent resistance value is obtained with the resistance value of the damaged resistor for the parallel-series combination resistance circuit being R1= 50 ῼ, R2 = 50 ῼ, and R3 = 50 ῼ..
DESAIN SALURAN TERBUKA BERBASIS MICROSOFT EXCEL: Perhitungan dan Pemodelan yang Praktis dan Effisien Faizal Agung Riyadi; Cahyadi, Tedy Agung; Nurkhamim; Supandi
KURVATEK Vol 4 No 2 (2019): November 2019
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v4i2.1563

Abstract

A channel is constructed as a media for water to flow. Phases of plan, design, and construction of a channel require a lot of time, effort, and budget. Design and construction of a channel need to be suited to certain requirements and characteristics of the location. Changes of design parameters often occurred as a result of technical and economical considerations. It leads to changes of channel design to adapt to the new parameters. Hence, the needs of tool to ease the calculation of channel design. Required parameters for channel design calculations are flow (Q), Chezy’s resistance factor (C), Darcy-Weisbach’s coefficient (f), atau Manning’s roughness factor (n), and the channel base gradient (i). The objective of this research are channel design calculations and modelling, in addition profide a tool which is practical and easy to use. The methods are Chezy, Darchy-Weisbach, and Manning formula to calculate the design of varied channel type using Microsoft Excel software. Determinations of Chezy’s resistance factor (C), Darcy-Weisbach’s coefficient (f), can be related to Manning’s roughness factor (n) value. Manning’s roughness factor (n) can be estimated from the size of channel bed’s lining material particles (d) using certain formula or define the value dirrectly from Manning’s roughness factor table.The result of this research including a tool for open channel design calculation and modelling“Kalkulator Desain Saluran – FAR”. The writers propose a new formula to estimate Manning’s roughness factor (n) value from the size of channel bed’s lining material particles (d). In addition, the writers propose formulas to directly calculate water level on the channel geometry section (y). The formula include coefficient of α which is based on relations of channel geometry parameters in to the formula of Chezy, Darchy-Weisbach, and Manning.
PENGARUH PENAMBAHAN GULA PASIR TERHADAP WAKTU IKAT AWAL PASTA SEMEN DAN MORTAR Retno Trimurtiningrum; Sutriono, Bantot; Arrowrichta, Billy; Watu, Hiasintus Bertus
KURVATEK Vol 4 No 2 (2019): November 2019
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v4i2.1564

Abstract

In concrete construction process, it is often happened that the location of batching plan is different from the project location, so it takes time in its material transport. To prevent the concrete material from early setting time before casting, it is necessary to add chemical admixture to slow the setting time, which is retarder. Generally, chemical admixtures including retarder have relatively expensive price. Therefore, this study used alternative material such as sugar, because sugar is one of retarder’s consituent material that has relatively low price and also easy to obtain. The percentage of sugar in this research were 0% (as a control specimen); 0.03%; 0.05% and 0.1%. The setting time test used the Vicat neddle apparatus for cement paste and penetration resistance tools for mortar. The setting time result shows that sugar can delay the initial setting time on cement paste or mortar specimens. The longest initial setting time was obtained by a mixture that has been added 0,1% of sugar which is 157,69 minutes for cement paste test and 250 minutes for mortar specimen.
PERENCANAAN SISTEM PHOTOVOLTAIC BEBAN ARUS SEARAH TERHUBUNG JALA-JALA Winasis; Muhammad Syaiful Haliim; Hari Prasetijo
KURVATEK Vol 5 No 1 (2020): April 2020
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v5i1.1565

Abstract

Photovoltaic (PV) systems utilize solar energy as a renewable energy source. A PV system can be connected to utility networks to ensure reliability. This study proposes a PV system model with direct current load on residential installation connected to utility grid. Optimal analysis of PV systems is done by comparing the architecture, energy production, losses, reliability and economic aspect considering the constraints of renewable energy fraction and capacity shortage. The results show PV system connections with grid reduce the capacity requirements of photovoltaic modules and batteries with a good level of reliability. The grid connected system equipped with batteries has the best level of renewable energy utilization with an excess electricity value of 2.19%. From an economic aspect, the system with the lower renewable energy fraction has less energy costs. This is due to the high price of PV components compared to the price of electricity from utility. Keyword : photovoltaic system, DC load, grid connected, optimal, utilization, reliability
APLIKASI BAND RATIO NDMI CITRA LANDSAT 8 DALAM PENENTUAN ZONA RAWAN LONGSOR DENGAN METODE OVERLAY ANALYSIS Vinansius Jimmy Jati; Sari Bahagiarti Kusumayudha; Tedy Agung Cahyadi
KURVATEK Vol 5 No 1 (2020): April 2020
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v5i1.1566

Abstract

Generally disaster research specifically identifies landslide-prone zones, over large areas with extreme terrain, usually secondary data on soil depth and texture are very rarely available, compared to topographic data, rock types, rock distribution and rainfall data. As an alternative the remote sensing method uses Landsat 8 imagery with the Normalized Difference Moisture Index (NDMI) band ratio method, the NDMI band ratio is able to identify the soil surface moisture index so that it can be interpreted with textures and soil depth related to the level of landslide vulnerability. With the method of overlay analysis using geographic information system (GIS) software, it is considered capable of analyzing the level of landslide vulnerability, especially in research on a regional scale, in remote areas that are difficult to access, based on secondary data availability. Keywords: Landsat, NDMI, Landslides, GIS
KAJI EKSPERIMENTAL PENGARUH KONDENSAT UNTUK MENDINGINKAN LIQUID LINE PADA CHEST TYPE MINI COOLER DENGAN METODE RADIANT COOLING Arda Rahardja Lukitobudi; Wendra Luthfi
KURVATEK Vol 5 No 1 (2020): April 2020
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v5i1.1567

Abstract

Liquid line sub cooler by condensate which is produced from chest type mini cooler wall is one of the methods to increase subcool so that the refrigeration capacity will increase and thus will save energy. Condensate which is produced by chest type mini cooler have lower temperature than the ambient temperature so it will decrease the liquid line temperature, where the condensate is flowed through the tube in tube of 30 cm long with 1 inch diameter to cool the liquid line. Radiant cooling is installed by planted evaporator coils in the cement wall where TXV is used as an expansion device with R22 as the refrigerant and 1 hp compressor capacity. Cabin having dimension of 50cm x 50cm x 50cm is cooled upto 5 0C to chilled 1 kg tomatos. The conclusion is that the chilling time with condensate HX is 35 minutes but without condensate HX is 38 minutes. The mean subcool temperature with condensate HX is 3.32 0C but without condensate HX is 0,03 0C. COPactual with condensate HX is 4.49 but without condensate HX is 4.55. System efficiency with condensate HX is 82.26% but without condensate HX is 80.66%. Energy consumption with condensate HX is 0.635 kWh but without condensate HX is 0.701 kWh. Keywords: radiant cooling, condensate, liquid line sub-cooler.

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