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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 13 Documents
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Search results for , issue "Vol 4 No 2 (2019): November 2019" : 13 Documents clear
PHYSICAL AND CHEMICAL PROPERTIES OF GROUNDWATER IN BANJARARUM AREA AND ITS VICINITY, WEST PROGO Sri Ning Peni; . . T. Listyani R.A.
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.v4i2.1138

Abstract

Groundwater in the Banjararum area is found in various rocks that build the West Progo Hills, including the Nanggulan and the Andesite Breccia Formations. Groundwater can be found in dug wells and springs. Field surveys show that the groundwater is generally clear, tasteless and odorless, except for the well at Ngipikrejo. Chemical test results from four samples showed that groundwater in limestone has Ca, Mg - HCO3 type, whereas in volcanic rocks of type Ca - HCO3 and Ca, Na - HCO3. Groundwater chemistry type is generated from the soil, mineral dissolution in sedimentary rocks and igneous rocks as well as the atmosphere through rainwater. The considerable content of NO3 in the Ngipikrejo area indicates pollution from human activities, plants or animal dung. In general, groundwater in the study area is suitable for use as clean water or drinking water, characterized by a measurable pH in the field of 6.6 - 7.2 and TDS 54 - 155 ppm. Nevertheless, laboratory test results show that groundwater samples are water-filled, with a hardness of 135,866 - 778,048 (moderately hard - very hard), so special treatment is required before drinking.
QUALITY AND GROUNDWATER FLOW AT DEGAN, BANJARARUM, WEST PROGO Dianto Isnawan; . . T. Listyani R.A.
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.v4i2.1141

Abstract

This research is a hydrogeological survey activity with the aim to determine the quality and pattern of groundwater flow in the Degan and surrounding areas, Banjararum Village, Kalibawang, West Progo District. The research method is carried out by hydrogeological surveys to collect groundwater data and groundwater quality in the form of pH, TDS and EC. The research area is included in the Dome of the Kulon Progo physiography, where this area is a non CAT area. The geomorphology of the study area in the north and west is dominated by relatively coarse landscapes forming hills, while in the central, eastern and southern parts it is a weak wavy landscape to the plains. The results showed that shallow groundwater depth of 1.2 - 10.8 m (under surface). The pattern of groundwater flow is to the east / southeast, with boundary conditions H5 and V1. Groundwater aquifers are composed of colluvium deposits and weathered  - medium weathered rock. The pH value of water in the study area ranges from 6.7 -7.1; TDS is 165 - 901 ppm, while EC ranges from 187 - 1240 µS / cm. Thus, groundwater in the Degan area is neutral and tasteless.
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 Akhmad Zamroni
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.
The Teaching Statistic Using Matlab Oni Oni Yuliani
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 undergraduate school. Application of this software in the teaching of some difficult topics like probability concepts, probability distribution, statistical significance, and significance tests, were demonstrated using the Matlab. Matlab has pro­ved it­self 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.. Keywords: genetic algorithm, resistor, combination, series parallel resistance circuit.
Desain Saluran Terbuka Berbasis Microsoft Excel Perhitungan dan Pemodelan yang Praktis dan Effisien Faizal Agung Riyadi; Tedy Agung Cahyadi; 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. Keyword : channel, design, geometry, practical, tool
Pengaruh Penambahan Gula Pasir terhadap Waktu Ikat Awal Pasta Semen dan Mortar Retno Trimurtiningrum; Bantot Sutriono; Billy Arrowrichta; Hiasintus Bertus Watu
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. Keyword : setting time, sugar, cement paste, mortar.
Busur Magmatik Granit Tantan-Nagan Sebagai Potensi REE Di Jambi Yulia Morsa Said; Bagus Adhitya Bagus; Anggi Delliana Siregar; Hari Wiki Utama; Magdalena Ritonga; Eko Kurniantoro
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.v4i2.1569

Abstract

ABSTRACT REE (Rare Earth Element) or Rare Earth Elements are minerals that contain one or more elements which contained in a group of 17 chemical elements, this group consists of the chemical group lanthanide (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium) are added with scandium and yttrium. In the era of Industry 4.0 or modern industry REE (Rare Earth Element) is a very strategic commodity, the use of rare earth elements is needed in various fields ranging from the electronics industry, telecommunications, modern transportation industry and many more. The REE (Rare Earth Element) density in Jambi-Sumatra occurred since the Early Mesozoic period, which was preceded by the formation of the Tantan Granite Formation to the Cenozoic period in the form of the Nagan Granite Formation.. The research location is in the Manau River, Merangin Regency which is part of the Sunda magmatic arc consists of intrusions granodiorite plutonic rock with xenolites in the form of andesites, micro diorites and diorites in the Tantan Formation, and in Nagan Formation consistsof intrusion of granite, granodiorite and Adamelit rocks. It’s happen because the forming process of REE (Rare Earth Element) mineral deposits is strongly associated with the cooling of plutonic igneous rocks. The purpose of this study are to determine the geological condition of the study area and its relationship to the REE (Rare Earth Element) and to find the potential of REE contained in the Tantan Formation and Nagan Formation in Merangin District, Jambi Province.

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