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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 6 No 2 (2021): November 2021" : 13 Documents clear
FABRIKASI DAN KARAKTERISASI MEMBRAN STYROFOAM DENGAN METODE ELEKTROSPINNING UNTUK PEMISAHAN MINYAK/AIR Rena Juwita Sari; Maria Ratih Puspita; Fitria Basuki Sukandaru; Akhmad Kusumaatmaja
KURVATEK Vol 6 No 2 (2021): November 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i2.1558

Abstract

Membrane separation technology is a new technology in oily wastewater treatment. High efficiency and relatively smooth operational processes are the main advantages that need to be looked at in membrane separation. Characterization of the styrofoam nanofiber membrane as an oil/water filter has been completed. Styrofoam membrane is made by electrospinning method with solvent concentration of 5 ml, 10 ml, 15 ml and 20 ml. In addition, the membrane filtration process test equipment was also made. The results of the FTIR spectrum of membrane filtration results explained that the new absorption peak of 1442.80 cm-1 caused an increase in membrane hydrophilic, at the absorption peak of 2841 cm-1 and an increase in absorption peak of 2926.13 cm-1 occurred due to the presence of water content in the membrane after testing. Whereas the absorption peak of 2084.49 cm-1 indicates an interaction between compounds in orange peel (phenolic, flavonoid and triterpenoid) with oil. Meanwhile, SEM results of styrofoam membranes after filtration showed that the size of the nanofiber became larger (swelling) and fouling occurred around the pore causing narrowing of the pore. This causes a decrease in permeability but increased selectivity. Keywords: membrane, styrofoam, nanofiber, electrospinning, oil water filtration
PREFERENSI MASYARAKAT DALAM PEMILIHAN MODA TRANSPORTASI PUBLIK DI KOTA YOGYAKARTA Dwi Kunto Nurkukuh; Amithya Irma Kurniawati
KURVATEK Vol 6 No 2 (2021): November 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i2.2093

Abstract

Public interest in public transportation in Yogyakarta City has decreased. This condition is exacerbated by the competition between conventional public transportation and online public transportation. The purpose of this study was to determine people's preferences in choosing the mode of public transportation in Yogyakarta City. The research was conducted using the Analytical Hierarchy Process (AHP). The people of Yogyakarta City pay attention to the mode selection criteria in the following order: 1) Safety, 2) Comfort, 3) Convenience, 4) Time, 5) Cost. The mode of public transportation chosen by the people of Yogyakarta City takes into account these five criteria, namely: 1) Online Car Ojek, 2) Online Motorbike Ojek, 3) Trans Bus, 4) Conventional Taxis, 5) Offline Motorbike Ojek, 6) Pedicab. From the cost criteria, Trans Bus is the most economical. From the time criteria, online motorcycle taxis are the fastest. From the criteria of convenience, online motorcycle taxi is the easiest. From the safety criteria, Online Car Ojek is the safest. From the comfort criteria, Online Car Ojek is the most comfortable.
PENERAPAN KECERDASAN BUATAN PADA PENILAIAN KELAYAKAN EKONOMI TAMBANG BATUBARA hidayatullah sidiq; Nur Widi Astanto Agus Tri Heriyadi
KURVATEK Vol 6 No 2 (2021): November 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i2.2278

Abstract

The economic feasibility valuation method is very important in determining the value of a project. The existence of high uncertainty in the mining industry, both from a technical and non-technical perspective, causes the risk of mining projects to be relatively higher compared to other industries. uncertainty is modeled by an unbroken probability series. This distribution is widely used to model uncertainty from non-technical factors such as commodity prices. To describe the uncertainty of the variable input in the simulation, the monte Carlo simulation technique can be used. In addition, to predict the selling price of coal using the bat algorithm. The results show that the prediction of coal prices is one of the parameters that are difficult to predict. To determine the selling price can use a predictive approach with the help of artificial intelligence. The price prediction using the Monte Carlo simulation results in the selling price of coal with calories 5700 kcal/kg is $ 42.2 per tonne. If using the bat algorithm is $ 42.18 per tonne. The feasibility analysis of a mining project using the DCF method shows the result NPV Maximal on stripping ratio 2.5 with a coal volume is 20 million tonnes.
STUDI ANALISIS DAYA DUKUNG TANAH TERHADAP FONDASI DALAM BERDASARKAN DATA SPT PADA BANGUNAN PELIMPAH DARI BENDUNGAN TUGU Muhammad Iqbal Hamidi; Imam Achmad Sadisun
KURVATEK Vol 6 No 2 (2021): November 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i2.2315

Abstract

The massive infrastructure works in Indonesia currently requires good planning and implementation. The research location is included in the spillway construction project of the Tugu Dam. The bearing capacity research is limited by calculated for the deep foundation in the boredpile type with a diameter of 0.8 meters used SPT (Standard Penetration Test) data. SPT testing is carried out based on SNI 4153:2008. Calculated of ultimate end bearing capacity (Qp) on volcanic breccia and andesite has a value of 19.60 Tons. Meanwhile, the value of ultimate frictional resistance (Qs) in this volcanic breccia and andesite has a value of 0.84 Ton, this ultimate frictional resistance value increases according to the planned depth of the foundation and is adjusted to the building loaded. The altered sandy silt layer, the ultimate end resistance (Qp), and the friction blanket resistance (Qs) varies according to the average value of N-SPT. The difference in the value of N-SPT in the same soil layer is due to geological processes such as hydrothermal alteration and rock weathering.
KARAKTERISTIK GEOLOGI TEKNIK DESA KATEKAN, KECAMATAN GANTIWARNO, KABUPATEN KLATEN, PROVINSI JAWA TENGAH Wisnu Aji Dwi Kristanto; Fandika Agustiyar; Ayu Damayanti; Vanya Cesaria Evelina Sari
KURVATEK Vol 6 No 2 (2021): November 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i2.2593

Abstract

Supporting data for sustainable development is increasingly being considered to fulfill good primary development data. One of the data that is often ignored is the engineering geology of the land. These data are needed to describe the response of the land to various aspects imposed on the land from a geological and engineering point of view. Thus, it is necessary to investigate the characteristics of engineering geology before the land is used or as part of the evaluation. Katekan village, with its rapid population growth, requires the construction of various life support facilities. This is evidenced by the construction of many new houses in various village areas and access roads with cast and asphalt materials. The development that occurs, not a few uses agricultural land which has clay-rich soil material. Many problems occur in the construction, including house cracks, cracks in the road, and puddles. It becomes interesting to investigate related to geological engineering conditions. Investigation of the technical geological characteristics of Katekan Village, which was carried out by qualitative and quantitative field mapping, resulted in the distribution of rock units in the form of alluvial deposits of clay, sand, and silt. Slope variation between 3°-8°. The level of ease of excavation of rock mass ranges from easy to excavate to challenging to excavate. Rock bearing capacity is 72.42-154.63 t/m2, and the soil bearing capacity is 13.63-41.51 t/m2.
KAJI EKSPERIMENTAL PENINGKATAN SUB-COOLING KONDESER PADA KULKAS SATU PINTU MENGGUNAKAN AIR KONDENSAT M. Fathan Sugih Bagja; Windy Hermawan Mitrakusuma; Triaji Pangripto Pramudantoro
KURVATEK Vol 6 No 2 (2021): November 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i2.2616

Abstract

Condensate water that collects in storage containers under the freezer cabin is often a problem in household refrigerators because it causes ice formation and puddles. In this final project, an experimental increase in sub-cooling in a single-door refrigerator is carried out by spraying condensate water on the kondenser outside the refrigerator every 2 minutes. It aims to utilize condensate water and improve system performance. After the measurement and data assessment process was carried out, the kondenser condition with spraying obtained chilling time for 38 minutes with the average data being stable from the 30th to the 36th minute resulting in an COPactual value of 3.2, COPcarnot 4.21, and an efficiency value. by 75.8%, while in kondenser conditions without spraying by condensate water, chilling time is obtained for 40 minutes with an average stable time from 32 to 38 minutes resulting in an COPactual value of 2.91, COPcarnot 3.97, and an efficiency value of 73.3 %. Then it can be concluded that the increase in sub-cooling using condensate water effectively utilizes condensate water and improves system performance.
KAJIAN KUALITAS AIR SUNGAI DENGKENG DI KECAMATAN BAYAT, KABUPATEN KLATEN, JAWA TENGAH Wawan Budianta; Sutrisno
KURVATEK Vol 6 No 2 (2021): November 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i2.2624

Abstract

Dengkeng River was one of the tributary rivers of Bengawan Solo river that flow in Kebon Village, Bayat Sub-district, Klaten District, Central Java Province. In the area of Bayat Sub-district, there are several batik industries near the Dengkeng River. This industry generated wastewater which influenced Dengkeng River water quality in the study area. This study aimed to investigate and analyze the water quality of the Dengkeng River in the study area. Ten river water samples were obtained in the long river water stream from upstream to downstream. The sampling was conducted in August 2021, and the river water sampling was sampled referred to the SNI procedure. Several water quality parameters were measured, including pH, TDS, EC, BOD, COD, and phenol. The water pollution index and river pollution loading was calculated to analyze the river pollution level. The result of the study shows that all parameter measured was below the threshold of water quality standard for class I, II, III and IV, except for COD parameter, which exceeds the threshold for water quality standard class I. Generally, the water quality in the river in the study area shows that the level of pollution was increased from upstream to downstream due to the presence of batik wastewater generated in the middle of the river stream up to downstream. The presence of batik wastewater has a significant contribution to the increasing water quality parameter level. The pollution index calculation results show that the status of river water quality standard in the study area includes the good category in the upstream, however in the middle to the downstream including for low polluted level category. The pollution load index calculation shows that generally, the pollution loading increase from upstream to downstream due to the batik wastewater. The study recommends better river water quality monitoring, maintenance of wastewater treatment facility and community participation for river management.
PERILAKU PALEOVOLKANO SEMADUM BERDASARKAN KARAKTER GEOKIMIA DAN PETROLOGI, KECAMATAN TUJUH BELAS, KABUPATEN BENGKAYANG, PROVINSI KALIMANTAN BARAT Fuad Nur Hussein; Hill Gendoet Hartono; Oky Sugarbo; I Gde Sukadana
KURVATEK Vol 6 No 2 (2021): November 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i2.2642

Abstract

The phenomenon of the existence of the Semadum volcano fossil located in Pisak Village, Tujuhbelas District, Bengkayang Regency, West Kalimantan has a Pliocene-Plistocene age with a clear cone-shaped morphology. The purpose of this study was to determine the behavior of the Semadum volcano in relation to the character of the magma, the pattern and typical eruptions and distribution of its products. The methodology used is field activity and geochemical analysis using X-Ray Fluorescence (XRF), Micro X-ray fluorescence (µXRF) and petrography. The Semadum volcano is geochemically composed of basaltic products, basaltic trachy andesite and dacite with basal to dacitic magma character which has a calc-alkaline affinity related to the subduction process, making Semadum volcano has 5 periods of effusive and explosive eruption activity with the Strombolian- Vulcanian type eruption with an eruption strength ranging from VEI < 2 makes the distribution of its product not too wide, it only centers on the body of the volcano which is the construction phase. Keywords: Volcano, Geochemistry, Petrology, Bengkayang, West Kalimantan
STUDI KELAYAKAN THERMOELECTRIC GENERATOR DARI ALUMUNIUM (Al) DAN KARBON (C) SEBAGAI SOLUSI LAIN ENERGI TERBARUKAN Asniar Aliyu
KURVATEK Vol 6 No 2 (2021): November 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i2.2713

Abstract

This study aims to create a prototype of a Thermoelectric Generator which is composed of a set of Aluminum (Al) and Carbon (C) series thermocouples as an alternative energy source. The initial stage in this research is to make a thermoelectric generator that is composed of 120 series thermocouple pairs or consists of 6 thermopiles (20 thermocouple pairs) arranged in series. Then the hot side is given a heat source using an electric iron and the cold side is equipped with a cooling fan and measures the output voltage generated based on changes in the heat generated by the electric iron. The test results show that temperatures up to 50°C produce a DC output voltage with a low increase in voltage change, while above that temperature the output voltage increases significantly. This shows that based on this initial experiment, Al and C thermoelectric generators are feasible to be used as an alternative energy source.
PEMODELAN GEOSTATISTIKA DATA VERTICAL ELECTRICAL SOUNDING UNTUK MENENTUKAN DISTRIBUSI AKUIFER AIR TANAH (STUDI KASUS: INSTITUT TEKNOLOGI SUMATERA) Aviv Alansyah
KURVATEK Vol 6 No 2 (2021): November 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i2.2741

Abstract

Geostatistical modeling is carried out to determine the spatial correlation of aquifer distribution with Vertical Electrical Sounding data. Geostatistical modeling is done using variogram analysis. Data Vertical Electrical Sounding used 24 point soundings using the Schlumberger configuration. The length of the VES measurement range is varied, with a minimum AB/2 of 2 m and a maximum AB/2 of 150 m and MN/2 changes made three times (0.5, 2, 10 m). VES data processing results are correlated with binding data in the form of Well Logging (resistivity log and SP logs). Based on the results of VES data processing and Well Logging, it was found that the ITERA campus has 2 aquifer layers, namely unconfined aquifers with resistivity values>80 μm which are suspected as tuff and confined aquifers with resistivity values of 20-80 80m which is thought to be the tuffaceous sandstone. In the geostatistical modeling, a model that is suitable for the distribution of VES data is obtained, which is a spherical variogram model with a 500 m lag. The results are used for gridding the iso resistivity map with kriging variogram correlated with the 3D model, it is obtained that the aquifer distribution in the western part is close to the surface (shallow) with a fairly thick layer that is around ± 48,865 m and increasingly towards the east the aquifer layer gets deeper and tend to thin out. Keyword : Aquifer, VES, Geostatistics, Well Logging, ITERA

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