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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 265 Documents
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KINERJA PIRANTI PENDINGIN TERMOAKUSTIK GELOMBANG TEGAK PADA TEBAL SUSUNAN STACK BERBEDA Wahyu Nur Achmadin
KURVATEK Vol 5 No 2 (2020): November 2020
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v5i2.2085

Abstract

Rusaknya lapisan ozon merupakan dampak langsung dari penggunaan refigerant terhadap lingkungan, sehingga untuk mengurangi dampak tersebut diperlukan sebuah teknologi yang ramah lingkungan. Piranti termoakustik merupakan salah satu dari beberapa teknologi ramah lingkungan yang memiliki fungsi yang sama yaitu dengan memanfaatkan perbedaan suhu sebagai sumber dari fenomena termoakustik. Medium yang digunakan adalah gas udara sehingga tidak menyebabkan bahaya pada lingkungan. Komponen utama piranti termoakustik terdiri dari regenerator, pipa resonator dan loudspeaker. Regenerator memiliki peranan yang besar yaitu sebagai tempat konversi energi terjadi. Penelitian ini akan membahas tentang pengaruh ketebalan stack yang terpasang di dalam regenerator pada kinerja piranti pendingin termoakustik gelombang tegak. Bahan yang digunakan adalah mesh ukuran #18 yang disusun rapat dengan ketebalan 4 cm sampai 5,5 cm dengan interval 0,5 cm. Waktu pengoperasian dilakukan selama 30 menit. Pipa resonator terbuat dari pipa PVC. Hasil penelitian ini menunjukkan bahwa ketebalan stack memiliki pengaruh terhadap penurunan suhu. Penurunan suhu terbesar dalam penelitian ini terjadi pada panjang stack 5,5 cm yang mampu menurunkan 4,7 C dari suhu awal penelitian. Kata kunci: termoakustik, gelombang tegak, regenerator
Kontak Formasi Nanggulan dan Andesit Tua di G. Mujil, Kulon Progo-Yogyakarta Winarti Winarti; Emy Sukiyah; Ildrem Syafri; Andi Agus Nur
KURVATEK Vol 6 No 1 (2021): April 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i1.2086

Abstract

Penyebaran Formasi Nanggulan di sisi timur Pegunungan Kulon Progo sangat terbatas. Di sekitar G. Mujil, Formasi Nanggulan dijumpai berada di bawah Formasi Andesit Tua. G. Mujil membentuk morfologi menonjol yang dinamakan sebagai tumor Nanggulan. Formasi Nanggulan dapat tersingkap di permukaan disebabkan oleh 2 (dua) faktor yaitu pertama breksi yang bersifat kaku dan berat menekan batuan sedimen yang plastis, serta kedua adanya sesar naik. Hipotesis dalam penelitian ini adalah kontak antara Formasi Nanggulan dan Andesit Tua dapat sebagai kontak stratigrafi atau sesar. Tujuan penelitian adalah untuk mengidentifikasi pola kontak antara Formasi Nanggulan dengan Andesit Tua, khususnya di G. Mujil dengan pendekatan data permukaan dan bawah permukaan. Metode yang dipergunakan adalah studi geologi dan pengukuran gayaberat. Pengukuran gayaberat menggunakan sistem looping, dengan jumlah titik sebanyak 19. Alat yang dipergunakan terdiri dari Gravitimeter LaCoste & Romberg G-118 MVR serta Global Positioning System (GPS) Trimble Navigations 4600 LS. Data lapangan menunjukkan jika kontak antara Formasi Nanggulan dengan Andesit Tua berupa kontak stratigrafi secara vertikal, dengan batas kontak formasiergelombang. Nilai densitas Formasi Nanggulan sebesar 2,5 gr/cm3, sedangkan Formasi Andesit Tua sebesar 2,7 gr/cm3. Anomali yang muncul di G. Mujil disebabkan karena berbedaan litologi, sehingga kontak antara Formasi Nanggulan dan Andesit Tua merupakan kontak stratigrafi. Kata kunci: Kontak formasi, Gayaberat, G. Mujil, Tumor
ANALISIS VARIABEL PENYEBAB TIDAK TERCAPAINYA RECOVERY BIJIH TIMAH PADA JIG DALAM PROSES PENCUCIAN DI KAPAL KERUK Rande, Aprilia
KURVATEK Vol 6 No 1 (2021): April 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i1.2087

Abstract

Instalasi pencucian pada Kapal Keruk berperan penting dalam proses produksi mengingat endapan yang terdapat pada penambangan lepas pantai adalah endapan alluvial berupa pasiran. Tujuan penelitian ini dilakukan untuk mengetahui proses recovery bijih timah pada jig dalam proses pencucian di Kapal Keruk dan menganalisis variabel yang menyebabkan tidak tercapainya recovery bijih timah pada jig dalam proses pencucian di Kapal Keruk. Pengaturan variabel-variabel jig memberikan pengaruh besar terhadap material undersize. Banyaknya material undersize akan berpengaruh terhadap recovery bijih timah yang dihasilkan dalam proses pencucian dengan target recovery 95,50 %, sehingga perlu dilakukan optimalisasi jig dengan melakukan perubahan pada variabel jig untuk meningkatkan recovery bijih timah pada Kapal Keruk. Variabel jig pada Kapal Keruk 19 Bangka 2 dilakukan perubahan pada panjang pukulan menjadi lebih besar dari sebelumnya (1 – 2 mm), dengan tujuan menyesuaikan ukuran fraksi diameter timah yang akan dilakukan pencucian (#50 – #70), sehingga meningkatnya recovery sesuai dengan SOP perusahaan. Pengaruh hasil recovery setelah dilakukannya perubahan ukuran variabel panjang pukulan menjadi 96,98 % dari 95,60 %. Tujuan utama perubahan variabel panjang pukulan adalah mengoptimalkan hasil pencucian menjadi lebih baik dan meningkat dari 0,10 % menjadi 1,48 % di atas target SOP. Kata kunci: Jig, recovery, pencucian, Kapal Keruk.
ANALISIS SEBARAN PENCEMARAN LINDI (LEACHATE) BERDASARKAN SIFAT KELISTRIKAN BATUAN MENGGUNAKAN METODE GEOLISTRIK Ninik Agustin; Siti Fauzatun Wachidah
KURVATEK Vol 6 No 1 (2021): April 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i1.2091

Abstract

Jeruklegi landfill has leachate management system that still potential for leachate infiltration in subsurface. Leachate contamination may occur if landfill activity is continuous and have an impact to local society. Leachate contamination is an environmental pollution man-made minor disaster clasified. This research is an early prevention step by identifying disaster source. Identification is done by analyzing leachate distribution in subsurface using geoelectrical method with Wenner-Schlumberger array. The result of data acquisition is resistivity which is processed to apparent resistivity. Apparent resistivity was modelled by inversion method that shows leachate contamination near surface by resistivity not least at 1 ohm.m. Leachate contamination was not found over 20 meters based on the lack of resistivity difference. This was confirmed by chemical test of bore well water that match to hygiene and sanitation standards. Keywords: leachate, resistivity, geoelectric, Wenner-Schlumberger.
KAJIAN GEOLOGI UNTUK MENENTUKAN AIR TANAH DAERAH SAMBIREJO, KECAMATAN PRAMBANAN, KABUPATEN SLEMAN, YOGYAKARTA Trianda, Obrin; Nur'aini, Siti
KURVATEK Vol 6 No 1 (2021): April 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i1.2092

Abstract

Sambirejo area (Prambanan Sub-District, Sleman District) is known as a water-scarcity area. The morphology shows as a hilly slope with is arranged by three lithology unit such as Semilir Formation (tuff sandstone and pumice breccia), Nglanggeran Formation (pyroclastic breccia) and alluvial unit. By having increasing number of population will be followed by fresh water needs of citizen, it will cause water-scarcity problems. Three aspects that controlling the fresh water availability in one area are morphology, lithology type and the depth of water table.The objective of this study is to investigate fresh-water resources in Sambirejo area. The problem arises is how to identify the good quality of water resource and also could be beneficial to fulfill the citizen’s water needs. Subsurface water management is still need to be conducted to gain the maximum water resources and soon after could be used directly by the citizen. The method of study firstly is geological mapping with the purpose of to identify the lithology distribution. Then the second is geo-electric resistivity to determine the fresh-water resources.Sambirejo area is known as a scare-water area due to the lithology composition such as breccia and tuff which is situated to the slope and ridge morphology. Water table presents at the depth between 20 to 40 meter is known as shallow aquifer whereas at the depth of 98 to 142 meter is categorized as almost deep aquifer. The typical of Sambirejo’s aquifer develops as a leaky unconfined aquifer where the lowest part of pumice breccia lithology is located impermeable tuff rock. Keywords: aquifer, lithology, fresh-water, Sambirejo
KARAKTERISTIK MINERALISASI BIJIH EMAS PADA PROSPEK HARGOSARI, KECAMATAN TIRTOMOYO, KABUPATEN WONOGIRI, PROVINSI JAWA TENGAH Arifudin Idrus; Wahyu Hermansyah
KURVATEK Vol 6 No 1 (2021): April 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i1.2125

Abstract

Tirtomoyo in Wonogiri district is known as an ore mineralization region, in which one of the prospects occurred is Hargosari. No previous studies on the ore characteristucs have been done. A set of study on Hargosari prospect is aimed to characterize gold mineralization covering some aspects such as mineralogy, textures, ore chemistry and ore forming condition. To achieve the objectives, some research methods were performed suh as mapping, sampling and laboratory analyses for selected samples on term of petrography, ore microscopy and ore chemistry. Oligo-Miocene andesitic lava from Panggang Formation is identified as host rock. Opening system of veins is of jogs type to form en-´echelon tension gash veins. Quartz veins are enveloped by argillic and propylitic alteration zones, in association with pyrite, chalcopyrite, sphalerite, galena, gold, silver, chrysocolla, covellite and hematite. The approximately 5 cm thick quartz veins exhibit massive, swarm, low angle veins and stockwork structures, which is characterized by normal banded, crustiform, comb and saccaroidal textures. The quartz veins contain high base metals of up to 5.45% Cu, 9.9% Pb and 12.85% Zn, with significant grade of gold and silver of up to 3.85 g/t Au dan 395 g/t Ag. From mineral assemblages, the veins might be formed at temperatures of about 250-300°C. On the basis of those mentioned characteristics, gold mineralization in Hargosari prospect is categorized into an intermediate sulfidation epithermal. Keywords: characteristics, gold, epithermal, Hargosari, Wonogiri.
FITOREMEDIASI TANAH TERCEMAR Pb DAN Zn DI TEMPAT PEMBUANGAN AKHIR (TPA) SAMPAH PIYUNGAN, YOGYAKARTA Kartika Eka Putri Srisena Siti Fatimah; Wawan Budianta
KURVATEK Vol 6 No 1 (2021): April 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i1.2129

Abstract

Piyungan waste disposal site is the largest waste disposal site in Yogyakarta and has an impact on heavy metals soil contamination, especially for lead (Pb) and zinc (Zn). This study aimed to analyze the effect of characteristics of polluted soil Pb and Zn contaminated soil in Piyungan site. The phytoremediation experiment was done in the polybags containing 2 kg contaminated soil samples and then was conducted in the greenhouse for three months and the plants were harvested each month. Plant samples were divided into roots and shoots part and the metal concentration was measured by ICP-AES after aqua regia digestion. The result of the phytoremediation experiment shows that Jatropha curcas and Amaranthus spinosus L. were detected along with the depth of the soil sampels taken, which indicated that the highest Pb and Zn contents were in the top soil layer. The soil characteristics in Piyungan landfill include pH, organic content, and mineral content of clay, which affect the effectiveness of absorption in the phytoremediation process, especially in montmorillonite content in the soil. This is confirmed and the results of the calculation of absorption efficiency and the calculation of mass balance and removal efficiency show that Jatropha curcas and Amaranthus spinosus L. have relatively low values. Keywords: Phytoremediation, soil, contamination, lead, zinc, waste.
PENCEMARAN LOGAM BERAT PADA TANAH DI SEKITAR TEMPAT PEMBUANGAN AKHIR (TPA) SAMPAH PIYUNGAN, BANTUL, YOGYAKARTA Mufid Muyassar; Wawan Budianta
KURVATEK Vol 6 No 1 (2021): April 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i1.2146

Abstract

Heavy metal leaching from waste disposal sites severely impacts the environment, especially on soil distributed vertically or laterally by water flow. The study investigates soil contamination by heavy metals, namely Pb, Cu, Zn, and Cd, around the Piyungan waste disposal site in Bantul, Yogyakarta. Seventy-five (75) soil sample was obtained systematically form the 15 boreholes in the study area. The location of the borehole is located in three-zone, namely the upper slope (PU), interface (PI), and downslope (PD) zone. The upper slope and downslope were not located in the near waste disposal site, where the interface zone was located around waste disposal. The soil sample analysis result shows that the heavy metals concentration in the soil found in the PI zone was higher than PU and PD zone. The study results show that the Pb, Cu, and Zn concentration in the soil sample was in average value or natural condition. The work also indicates that heavy metals concentration was higher and accumulated in the surface soil in 0-25 cm depth and later decreased to 100 cm depth. The field situation shows that the infiltration of leachate due to waste decomposition was the primary source of heavy metals contaminant. In general, soil's physical and chemical properties in the study area have a sufficient ability to retain heavy metals migration down to the soil profile. However, the change of infiltration caused by high rainfall will affect the heavy metals' mobility, which has a potential for groundwater contamination in the extended period. Keywords: soil, contamination, heavy, metal, waste
GUNUNG API PURBA CANDISARI : IDENTIFIKASI AWAL, KARAKTERISASI PEMBENTUKAN, POSISI STRATIGRAFI DAN POTENSI PEMANFAATANNYA Oky Sugarbo
KURVATEK Vol 6 No 1 (2021): April 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i1.2254

Abstract

Abstract In the Southern Mountain Zone, many volcanic rocks that products of the Tertiary Volcanic Arc are exposed. In this zone, a lot of research has been carried out, but research about ancient volcanoes and the center of the ancient eruption has not been carried out thoroughly, so it is necessary to carry out further research related to the ancient volcanism of the Southern Mountains. The purpose of this research is to identify the preliminary study about existence of ancient volcanoes based on field and laboratory data with the aim of knowing the character, genesis, stratigraphic position and the potential of ancient volcanoes that produce many volcanic rocks. The research method used is a surface mapping method that supported by laboratory data such as petrographic and rock geochemistry using X-Ray Flourecence. In the study area, there were indications of ancient volcanoes based on image data, lithology, stratigraphy, petrography and geochemistry with facies association in the upper proximal facies. Stratigraphically, the Ancient Volcanic Rocks of Canndisari are under the Semilir Formation but not part of the Kebo-Butak Formation. The abundance of volcanic rocks can be used as class C mining materials. In addition, it is necessary to carry out further studies on the existence of hydrothermal alteration in the research area which may be used by local communities because altered rocks have economic value. Keywords: lava, genesis, volcanism, ancient, Candisari.
SISTEM PENCAHAYAAN DENGAN FUZZY LOGIC CONTROLLER Arif Basuki; Sugiarto Kadiman; Rizki Ismail
KURVATEK Vol 6 No 1 (2021): April 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i1.2262

Abstract

A “newest” room lighting system always links with environmental issues for reducing the consumption of primary energy such as coal and oil. The process carry out by adding natural lighting as solar lighting into artificial lighting. But the problem in combining these systems depends significantly on the condition of natural lighting, such as on weather conditions and light interference based on building construction (isolated or not isolated). Smart systems such as fuzzy logic can be used solution the problem. From the results of this study is artificial lighting can be reduced by half from its maximum condition but with different error margins depending on amount of light interference obtained. The values of these results can be monitored in real-time with IoT (Internet of Thing) media. Keywords: “The newest” lighting systems, Artificial and natural hybrid system, Fuzzy logic controller, monitoring error margin, IoT monitoring

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