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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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KARAKTERISTIK ENDAPAN DANAU RAWA PENING DI MUARA INLET SUNGAI GALEH, KECAMATAN AMBARAWA, KABUPATEN SEMARANG Setyo Pambudi; Muhammad Fikri Abubakar
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.v5i1.1784

Abstract

The Galeh River inlet estuary on Lake Rawa Pening is located in Ambarawa District, Semarang Regency. Sampling of Rawa Pening sediment at two points using modern coring methods. The coring results were observed and granulometric analysis was done using lazer scanning method with Master Sizer 2000. Core RWP-01 samples in the form of fine clastic sediments (Sand-Silt), reflecting the inlet river estuary environment in the hydrological lake system which is influenced by the fluvio-lacustrin process and showing characterizer of shallow lake facies. RWP-02 core samples in the form of fine-textured sediments (mud) rich in organic material, reflecting a relatively calm and stable depositional environment, formed by the density current mechanism that characterize the deep lake facies. The development of these sedimentary characters shows changes in sedimentary facies, namely shallow lake facies developing into clastical lake lacustrine into deep lake lacustrine facies.
KONTROL GEOLOGI TERHADAP PEMUNCULAN MANIFESTASI PANASBUMI DI KAWASAN GUNUNG LAWU Hurien Helmi; Hengky Kurniawan; Widi Adam
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.v5i1.1790

Abstract

Gunung Lawu exhibit a prominent geothermal manifestation indicate promising geothermal potentials. The occurence of geothermal manifestations around the volcano indicates the occurrence of geothermal system in the area. Further detail investigations are required to confirm the occurrence of a well established geothermal system. Information about the geological factors controlling the geothermal manifestation is crucial to understand the geothermal system in an area. We analyze the previously available geological maps, lineament density, and geochemical analysis of the hotsprings in the area of Mt. Lawu to understand the correlation between the geological condition, especially the structural geology and the geothermal manifestation. Our results indicates that the occurence of the geothermal manifestations in the area is not directly correlated with the mapped major normal faults, but instead with the minor fracture regions. The lineament fractal density analysis also indicate that the high fractal density value does not coincide with the faults. The faults are located in the regions of medium fractal density. It is likely that the high lineament fractal density is mostly controlled by surface processes insetad of representing tectonic significance. The occurrence of the geothermal manifestations are located in the medium lineament density value, which may represented areas with minor fractures. Geochemical analysis supports this interpretation, analysis of the geochemistry of the samples taken from Cumpleng and Ngunut hotsprings shown bicarbonate-type. We also observe the presence of limonite and travertin deposits. This type of geothermal fluids and mineral deposits are commonly associated with the presence of fractures and cracks below or near the surface.
APLIKASI MICROBUBBLE GENERATOR POROUS-VENTURI PADA PENGOLAHAN AIR LIMBAH BUATAN Lathifa Putri Afisna; Wibawa Endra Juwana
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.v5i1.1818

Abstract

Abstract The limitation of clean water due to water pollution from household and industrial waste, it is necessary to develop an environmentally friendly waste water treatment technology and installation easily. Microbubble generator (MBG) is used to produce oxygen needed by bacteria to decompose wastewater. In this study a porous-venturi MBG was designed to be installed in an artificial wastewater pool. The parameters to be measured are mass transfer coefficient (KLa), dissolved oxygen (DO) and chemical oxygen demand (COD). KLa values ​​are measured using DO meters mounted 60 cm and 180 cm from the MBG. Liquid flowrate is set 30-80 lpm and gas flowrate is set 0.1, 0.4 and 1 lpm. Based on the results of the study, the increase in liquid flowrate at all measurement distances causes the KLa value increase too, but the increase in gas flowrate does not significantly affect. The higher DO value will reduce COD value in artificial waste water below to 100 mg /L. Keywords :Microbubble, venturi, DO, COD, KLa
KOMPLEKSITAS PERMASALAHAN MERKURI DALAM PENGOLAHAN BIJIH EMAS BERDASARKAN PERSPEKTIF TEKNIS LINGKUNGAN MANUSIA DAN MASA DEPAN Erry Sumarjono
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.v5i1.1833

Abstract

Mercury is one of the most dangerous heavy metal. It has highest negative effects to human and environment. It has advantage to extract gold from it’s ore, because, naturally, the character of Mercury had high affinity with Gold particle. It is very easy to use Mercury to extract Gold from it’s ore. The name of methode of mineral processing to extract Gold is Amalgamation method. Amalgamation method used tromol that had ball or rod iron inside. The function of them is look like a ball mill to crush and grind the Gold ore.Using Mercury is an easy way to extract the Gold, but, in the other hand, Mercury had been a negative effect that it has been to be continued for along times future. The complexity problems of Mercury could not to be handle by one country or one government, it must to be handled by international and global relationships. Keywords : Environment, Extraction, Heavy Metal, Mercury, Pollutant
EFEKTIVITAS SOFTWARE SPLIT DESKTOP PADA PELEDAKAN Agung Dwi Sutrisno
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.v5i2.754

Abstract

Fragmentasi batuan sangat berpengaruh terhadap produktivitas penambangan yang menggunakan peledakan sebagai salah satu metode pembongkaran batuan. Tujuan penelitian ini adalah mengkaji efektivitas penggunaan Software Split Desktop pada analisis fragmentasi batuan hasil peledakan. Pendekatan penelitian ini menggunakan metode pengamatan di lapangan dan laboratorium. Data primer diambil langsung di lapangan dan data sekunder dari perusahaan. Data primer berupa foto fragmentasi hasil peledakan yang dianalisis ukuran fragmentasinya menggunakan Software Split Desktop. Hasilnya, Software Split Desktop dapat menganalisis dengan cepat fragmentasi batuan dengan media foto hasil peledakan. Analisis yang cepat ini dapat segera digunakan untuk mengubah desain peledakan berikutnya, sehingga menjadi lebih efektif.Kata kunci: batubara, konturing, kriging, trianggulasi.
KEMAMPUAN GEOLOGI TEKNIK UNTUK PENGEMBANGAN KAWASAN WISATA DAERAH EMBUNG JURANG JERO, HARJOBINANGUN, PAKEM, SLEMAN, YOGYAKARTA Wisnu Aji Dwi Kristanto; I Putu Gema Bujangga
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.v5i2.1435

Abstract

Embung is an artificial building with the main function of collecting and distributing surface water. However, embung has a tourist attraction that is starting to become a trend of society. The development of the embung as a function of tourism must be supported by technical aspects, one of which is the engineering geology capability which is a measure of land suitability. Embung Jurang Jero was built in 2009 in Jurang Jero village, Harjobinangun, Pakem, Sleman, Yogyakarta with a capacity to accommodate 32,828.88 m3 of water. Located on the lower slopes of Merapi Volcano with natural attractions that support being developed into a tourist area. Thus, it is interesting to do research on the engineering geology capability of the embung Jurang Jero area for the development of environmentally friendly tourism areas. This research was conducted by mapping and weighting analysis of supporting parameters consisting of rock and soil carrying capacity, slope, geological hazard potential, groundwater depth, ease of excavation, and land use. The results showed three zones of engineering geology capability for the development of tourist areas in the form of high, medium, and low capability zones.Keywords: capability, Engineering Geology, embung, tourism, Jurang Jero.
PEMANFAATAN LIMBAH STYROFOAM SEBAGAI LOSS CIRCULATION MATERIAL PADA LUMPUR PEMBORAN PANAS BUMI lia yu nita
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.v5i2.1605

Abstract

Drilling mud is an important factor in drilling operations. drilling mud can function properly, if the mud is always controlled for its physical properties. This research, utilizing Styrofoam waste which is used as an additive in drilling mud in geothermal drilling to overcome Loss Circulation. The physical properties of sludge used as a controller to overcome loss circulation include specific gravity (density), viscosity, and filtration loss. The purpose of this study is to prove styrofoam waste that can be used as a Loss Circulation Material. The methodology used in this study is in accordance with American Petroleum Institute API 13A Standards. The sample used in the test uses four drill mud samples and three measurements. Sample 1 drilling mud without additives, second sample drilling mud plus additive 1 gram Styrofoam, second sample drilling mud plus additive 2 gram styrofoam second sample drilling mud plus additive 3 gram styrofoam Materials used include aquadest, bentonite and polished Styrofoam waste. The results of the addition of three gram styrofoam obtained a price density of 8.63 ppg, mud cake valued at 1.254 mm, a 13 ml filtrate volume per thirty minutes with a pH of 9 and meeting the API standard. loss of circulation material in geothermal drilling.Keywords: Styrofoam waste, drilling mud, loss circulation material, geothermal
PENYELIDIKAN GEOLISTRIK MENGGUNAKAN KONFIGURASI SCHLUMBERGER TERHADAP POTENSI AMBLESAN DAERAH PONJONG, GUNUNG KIDUL Rizqi, Al Hussein Flowers; Yudhana, Waskita Murti Bambang
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.v5i2.1769

Abstract

Administratively, the research area is included in Ponjong Subdistrict, Gunung Kidul Regency, Special Region of Yogyakarta. Geographically, it’s located in 07°56’30" - 08°1’0" East Longitude and 110°42’30" - 110°46’0" South Latitude. Several subsidences were occurred in Ponjong, Gunung Kidul in 2018. This study is aimed to determine the subsurface stratigraphy and analyze the depth of rocks layer which has the potential of subsidence (sinkhole) based on the value of rocks resistivity in Ponjong area. Resistivity was measured by geoelectrical method by appllying Schlumberger configuration. As a result, the study areas indicates that the most potential area having sinkhole are composed of lithology of carbonate rocks from Wonosari Formation (crystaline limestone and chalky limestone). Those are in the Asem Lulang village in showed small value of rock resistivity, about 0.1 to <1 (Ωm) at the depth of 15 to 63 meter and more than 123 meter. If it comparated to the village of Sawahombo and Kenteng village, the result showed that relative potential area of subsidence (sinkhole) only at shallow depth and nearly to the surface which is only 10 to 15 meter from surface.Keywords: geoelectric, ponjong, Schlumberger, Sinkhole, Wonosari
PENGARUH SISTEM PENTANAHAN GARDU DISTRIBUSI TERHADAP TEGANGAN SENTUH Dulhadi; Diah Suwarti Widyastuti; Indra Budhi Frebrianto
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.v6i1.1797

Abstract

Sistem pentanahan pada gardu distribusi diperlukan untuk mengatasi terjadinya tegangan sentuh baik pada transformator maupun benda konduktor lain yang melekat padanya. Batas maksimal tegangan sentuh yang masih dianggap belum membahayakan manusia sebesar 50 volt (PUIL 2000). Salah satu terjadinya tegangan sentuh karena faktor sistem pentanahan yang tidak memenuhi syarat dan adanya aliran arus gangguan hubung singkat pada rangkaian tertutup. Kondisi ini berbahaya bagi manusia yang menyentuhnya dan dapat menyebabkan kematian. Penelitian ini bertujuan membandingkan sistem pentanahan eksisting (Solid Grounding) dan Grid Grounding (baru) pada gardu distribusi untuk mengetahui sistem pentanahan tersebut aman bagi manusia. Metode yang digunakan adalah pengukuran pentanahan eksisting (Sistem Solid Grounding ) dan pengukuran pentanahan pada sistem baru (Grid System Grounding) sejumlah 20 titik sistem terintegrasi. Data hasil pengukuran digunakan untuk menghitung besaran tegangan sentuh pada masing-masing sistem tersebut. Hasil penelitian kondisi pentanahan eksisting sebesar 5,056 ohm dapat menyebabkan tegangan sentuh sebesar 1013,906 Volt serta sistem grid dari hasil uji coba 20 titik didapat 0,16 Ohm dan tegangan sentuh sebesar 42,14 Volt. Kesimpulan yang didapatkan bahwa kondisi sistem pentanahan eksisting belum dapat memperkecil tingkat bahaya tegangan sentuh bagi manusia sedangkan sistem grid dapat mengamankan manusia dari bahaya tegangan sentuh. Kata kunci: Sistem Pentanahan, Tegangan Sentuh, Trafo Distribusi.
KAJIAN STABILITAS SISTEM KELISTRIKAN INDUSTRI Dulhadi Dulhadi; Dewi Indriati Hadi Putri
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.v5i2.1814

Abstract

This research discusses the dynamic behavior of the operation of several synchronous generators in industrial electrical systems and to find out various factors that affect the stability of the electric power system. This research aims to develop an analysis method of stability that is practical, informative, and quite accurate. The analysis was performed by step by step numerical integration method. Observations were made on the oscillations between rotors, the simultaneity of the generator, the ability and speed of the system to reach a new steady state.The results of this research indicate that electrical system disturbance can cause oscillations between generators which reduce the ability and speed of the system in achieving steady-state conditions. This oscillation creates voltage and frequency fluctuations for a long time. Stability margins can be increased by regulating the burden for each generating unit corresponding with the characteristics and capabilities of each generator, network configuration, and operating load. Simulations of several cases indicate that the generator response to electrical noise very influenced by operating conditions, clearing time, location of disturbance, and changes in network configuration.Keywords: Transient stability, multi-machine system, step by step integration

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