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Identifikasi Keterdapatan Mineral Radioaktif pada Urat-Urat Magnetit di Daerah Ella Ilir, Melawi, Kalimantan Barat Ngadenin; Indrastomo, Frederikus Dian; Widodo; Widana, Kurnia Setiawan
EKSPLORIUM Vol. 40 No. 1 (2019): MEI 2019
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2019.40.1.5350

Abstract

Ella Ilir administratively located in Melawi Regency, West Kalimantan. Regional geology of Ella Ilir area is composed of metamorphic rocks in Triassic–Carboniferous age which are intruded by Jurassic and Cretaceous granitic rocks. Radioactive minerals occurences in the area are indicated by magnetite veins radioactivities on Triassic to Carboniferous metamorphic rocks whose values range from 1,000 c/s to 15,000 c/s. Goal of the study is to determine the type of ore mineral deposits and to identify the presence of radioactive mineral in magnetite veins in Ella Ilir area. The methods used are geological mapping, radioactivity measurements, analysis on uranium grades, and mineragraphy analysis of severe magnetite veins samples. Lithologies of the study area are composed by biotite quartzite, metatuff, metasilt, metapellite, biotite granite, and ryolite. The east-west sinistral fault and the north-south dextral fault are the developed fault structures in this area. Mineral composition of magnetite veins are consists of iron ore, sulfide, and radioactive minerals. Iron ore mineral consists of magnetite, hematit, and goetite. Sulfide minerals consist of pyrite, pirhotite, and molybdenite, while radioactive minerals consist of uraninite and gummite. The occurences of magnetite veins are controlled by lithology and geological structures. The magnetite veins in metasilt are thick (1.5–5 m), filled the fractures in the fault zone. Meanwhile, the magnetite veins in metapellite are thinner (milimetric–centimetric), filled the fractures that are parallel to the schistocity. The ore deposits in the study area are iron ore deposits or magnetite ore deposits formed by magmatic hydrothermal processes.
Karakterisasi Hidrogeologi Daerah Sekitar Tapak PLTN di Bengkayang, Kalimantan Barat Muhammad, Adi Gunawan; Fauzi, Rachman; Karunianto, Adhika Junara; Cakrabuana, Wira; Widodo
EKSPLORIUM Vol. 42 No. 2 (2021): NOVEMBER 2021
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2021.42.2.6479

Abstract

Site evaluation is an important phase of site selection for commercial-scale nuclear power plants (NPP) in Indonesia. Geotechnical and radioactive material dispersion aspects are some of the aspects which are assessed in site evaluation under provisions of laws and regulations. To support those aspect evaluations, it is necessary to conduct hydrogeological characterization in the vicinity of the NPP site. The purpose of this study is to determine the hydrogeological characteristic of the vicinity of the NPP site in Bengkayang Regency, West Kalimantan Province based on geological and geophysical aspects. The methods of this study consist of geomorphological mapping, geological mapping, hydrogeological mapping, geoelectric measurement, and integrated analysis. The study area consists of three morphological units: alluvial plain, isolated hills, and coastal plain. Stratigraphically, the lithology units of the study area, from the oldest to the youngest, consist of andesite, granodiorite, diorite, quartz sand deposits, coastal deposits, and alluvial deposits. The geophysical measurement used is the geoelectric method which is conducted at 12 electrode arrays with 470 m length and spacing of 10 m. In the geoelectrical section, it can be seen that several anomalies can be interpreted as the fractured body of igneous rocks or the diorite intrusion in andesite. These anomaly values are ranged from 300 Wm to >8000 Wm. The relatively low resistivity values (<30 Wm) are interpreted as water saturated-alluvial deposits that could have a thickness of ±100 m. There are three hydrogeological units in the study area: aquifers in which flow is intergranular with high permeability, aquifers in which flow is intergranular with moderate permeability, and aquifug of local importance. Generally, the groundwater in the study area flows from SSW to NNE.
Characterization of Radioactive and Rare Earth Elements in Heavy Minerals from River Sediments in Marau Region, Ketapang, West Kalimantan Pratiwi, Fadiah; Rachael, Yoshi; Widodo; Fauzi, Rachman; Madyaningarum, Nunik; Adimedha, Tyto Baskara; Indrastomo, Frederikus Dian; Sukadana, I Gde
EKSPLORIUM Vol. 45 No. 1 (2024): MAY 2024
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2024.6971

Abstract

Alluvium deposits from the Kendawangan River located in Marau, Ketapang, West Kalimantan have been known for their radioactive and rare earth mineral potential. In this paper, heavy minerals taken from alluvium deposits will be characterized to determine the elemental distribution of uranium, thorium, and rare earth elements in each mineral and their mineralogical composition. The samples are taken by panning and prepared using the flotation method to obtain heavy mineral concentrates. Geochemical analysis was carried out using a Bruker M4 Tornado plus Micro-XRF and continued with mineralogical analysis using AMICS (Advanced Mineral Identification and Characterization System) software. It was found that the distribution of heavy minerals from the sand samples was dominated by manganoan ilmenite, ilmenite, rutile, zircon, magnetite, and monazite, as well as thorite, cassiterite, xenotime, allanite, and other minerals in small quantities. Uranium, thorium, and rare earth elements are found in monazite, thorite, xenotime, zircon, and allanite.
Enhancing Teacher Performance: A Meta Analytic Examination of Organizational Citizenship Behavior and Proactive Personality Ardiansyah, Achmad; Widodo; Prasetyono, Hendro
Jurnal Penelitian Pendidikan IPA Vol 11 No 10 (2025): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i10.12840

Abstract

Teacher performance is crucial for improving the quality of education in schools and the academic performance of students. Past studies have shown that both OCB and positive personality can have a significant impact on teacher performance. However, in order to better understand the strength and consistency of the correlation between these factors and performance, it is necessary to comprehensively integrate and analyze previous empirical findings. This meta-analysis examines the impact of organizational citizenship behavior (OCB) and proactive personality on teacher performance, synthesizing findings from 35 empirical studies published between 2020 and 2025. The results show that both OCB (r = 0.533) and proactive personality (r = 0.444) have significant positive effects on teacher performance, with OCB having a slightly stronger influence. The analysis reveals moderate heterogeneity across studies and no evidence of publication bias. These results strongly demonstrate the need for nuturing and it is OCB and proactive personality in schools to enhance teacher effectiveness. Practical implications include promoting a sense of organizational belonging and informal recognition to improve teacher performance outcomes.
STUDI GETARAN MESIN ROTOR 0,4 KW BELT KONDISI PARALEL MISALIGNMENT MENGGUNAKAN INDUSTRIAL VIBRATION ANALYZER Rachmanu, Fatkur; widodo; Is Subekti, Mokhamad; Wira Manggala, Dimas; Turmudi, Agung
JURNAL RAMATEKNO Vol 5 No 2 (2025): Jurnal_Ramatekno_vol_5_no_2_2025
Publisher : LPPM Politeknik Enjinering Indorama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61713/jrt.v5i2.264

Abstract

Pengujian getaran merupakan kegiatan pemeliharaan pada sebuah mesin berputar. Getaran yang tinggi pada suatu mesin dapat disebabkan oleh kasus Misalignment. Studi vibrasi ini bertujuan untuk mengetahui grafik FFT yang dihasilkan oleh getaran pada kondisi Misalignment. Metode pengukuran getaran dilakukan dengan menggunakan Vibration analyzer yang dapat membaca nilai RMS (Root Means Square) velocity suatu getaran pada posisi aksial pada bearing (pillow block) UCP 202 yang dapat diolah menjadi grafik FFT. Berdasarkan pengujian nilai velocity dan frequensi yang dihasilkan kondisi misalignment dengan kecepatan putara poros 1500 RPM menghasilkan nilai velocity 1x RPM tertinggi yaitu 2,44 mm/s dengan frekuensi 24,6 Hz yang terdapat pada posisi 3A bearing DE, dan nilai velocity terendah dengan kecepatan putaran poros 500 RPM menghasilkan nilai velocity 1x RPM sebesar 1,18 mm/s dengan frekuensi 8,3 Hz yang terdapat pada posisi 4A bearing NDE .
ANALISIS EFEKTIVITAS PLATE HEAT EXCHANGER PADA GAS TURBIN : ANALISIS EFEKTIVITAS PLATE HEAT EXCHANGER PADA GAS TURBIN Hiermy, Ulpen; Affris Freza Frananda, Muhamad; Zoehry, Mochammad; widodo; Syafrizal
JURNAL RAMATEKNO Vol 5 No 2 (2025): Jurnal_Ramatekno_vol_5_no_2_2025
Publisher : LPPM Politeknik Enjinering Indorama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61713/jrt.v5i2.278

Abstract

Alat penukar panas atau Heat Exchanger (HE) merupakan suatu alat yang digunakan untuk memindahkan panas dari sistem ke sistem lain tanpa perpindahan massa dan bisa berfungsi sebagai pemanas maupun sebagai pendingin. Plate Heat Exchanger  ( PHE ) merupakan salah satu jenis Heat Exchanger (HE). Plate heat exchanger (PHE) adalah salah satu komponen penting dalam sistem gas turbin yang berfungsi untuk memindahkan panas dari gas turbin ke air pendingin dan merupakan salah satu komponen utama dalam sistem pelumasan turbin gas. Permasalahn yang timbul adalah Mengetahui apakah  nilai efektivitas pada  plate heat exchanger gas turbine   masih dalam keadaan normal atau sudah mengalami penurunan performa? dengan tujuan mengetahui dan menghitung nilai efekivitas  pada plat heat echanger (PHE) pada gas turbin. Metode yang digunakan pada perhitungan ini yaitu METODE-NTU.Pada METODE-NTU ( Number Of Transfer Unit ) ini efektivitas Plate Heat Exchanger (PHE) dapat diperoleh dengan perpindahan kalor nyata ( aktual ) dibagi dengan perpindahan kalor maksimum yang mungkin ( spesifikasi ). Data yang dibutuhkan pada perhitungan ini yaitu temperature inlet dan outlet water, temperature inlet dan outlet oil, flow rate water dan flow rate oil .Dari hasil perhitungan percobaan pertama didapatkan panas ( q ) aktual dengan nilai 57 Kw dan panas ( q ) maksimum dengan nilai 96 Kw sehingga efektivitas Plate Heat Exchanger (PHE) adalah 59 % , pada hasil perhitungan percobaan ketujuh didapatkan panas ( q ) aktual 44 Kw dan panas ( q ) maksimum dengan nilai 96 Kw sehingga efektivitas Plate Heat Exchanger (PHE) adalah 45 %. Dari hasil perhitungan percobaan pertama sampai ketujuh dapat diketahui Plate HeatExchanger mengalami penuruna performa.
Peran Audit Energi dalam Pengembangan Program Manajemen Energi di Bangunan dan Industri: Sebuah Kajian Literatur: Audit Energi Khairul; Suseno, Doni; widodo
JURNAL RAMATEKNO Vol 5 No 2 (2025): Jurnal_Ramatekno_vol_5_no_2_2025
Publisher : LPPM Politeknik Enjinering Indorama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61713/jrt.v5i2.285

Abstract

Abstrak Audit energi memiliki peran penting dalam upaya meningkatkan efisiensi penggunaan energi, terutama pada bangunan dan sektor industri. Melalui audit energi, dapat diidentifikasi potensi pemborosan, peluang penghematan, serta strategi manajemen energi yang tepat guna. Penelitian ini dilakukan melalui kajian literatur terhadap berbagai sumber ilmiah, standar internasional (ISO 50001, ASHRAE Level I–III), serta laporan implementasi audit energi di Indonesia dan kawasan Asia Tenggara. Hasil kajian menunjukkan bahwa penerapan audit energi secara sistematis dan berkelanjutan dapat menghasilkan efisiensi energi hingga 10–30% tergantung pada karakteristik sistem dan penerapan rekomendasi. Kajian juga menyoroti peran digitalisasi audit energi berbasis IoT dan AI, serta pentingnya kompetensi auditor energi bersertifikat BNSP. Keberhasilan audit energi sangat dipengaruhi oleh dukungan manajemen, ketersediaan data konsumsi energi, serta kebijakan pemerintah dalam mendorong penerapan manajemen energi nasional menuju target Net Zero Emission 2060.
Co-Authors ABDUL MUNIF Achmad Irchamni Adam Punca Putra Pinaria Ade Irvan Tauvana Adhi, Bambang Prasetya Adhika Junara Karunianto Adi Gunawan Muhammad Adimedha, Tyto Baskara Affris Freza Frananda, Muhamad Agung Riansa, Dimas Agus Muji Santoso Agus PURWANTARA Agustin Sukarsono, Agustin Agustina Putri Reistanti Ajie, Hamidillah Alamsyah, Wan Ali nur Fatoni ALI NURMANSYAH Ali Yusuf Alisha Prameswari Ganandi Alnopri Alzami, Farrikh Amara, Khansa Anang Efendi Andika Rifki Aprilian Andoy, Aldis S Andriansyah, Rian Ardath Prahara Setyan ARDIANSYAH, ACHMAD Ari Surya Sukarno Arief Raharjo, Hafiez Aris, Tomi Asmoro, Purwandito Tulus Atmaja Johny Artha, I Ketut Auriga Putri Faradilla Aziz Syahputro, Razi Azizah Khoiro Nisah balqis Bambang Gonggo Murcitro Bambang Priadi Bayu Dwi Welasasih Betty Lukiati Bhayu Aji Seno Budi Santosa, Achadi Budi, Ferri Stya Bulandari, Desty Cakrabuana, Wira Cherish Okcavia, Salsabila Deki Riana Devi Ratnasari Dwi Cahyo, Muhamad Prasetio Dwi Suchisty Dwi Wibowo Edi Susanto Efendi, Edi Eki Nugraha Eko Suprijono Elvi Amir Endang Wahyuni Erny Roesminingsih Fahira kiyyun Nur Misbah Fahrurrozi Fakhriyani Fathiah Fatika La Viola Ifanka Fauzi, Rachman Febrianto Widyoutomo Fiky Ariestia Filsa, Nisfal Frederikus Dian Indrastomo, Frederikus Dian Giyanto Guntur Gusmara, Herry Hamidillah Ajie Hana Agita Mardiana Hanifa Dian Permatasari Hariyoto, Hariyoto Hartanto, Ageng Hasanah, Enung Hendro Prasetyono Henry Sudianto Heryanto Susilo HESTI PUJIwATI Hidayah, Dian Hiermy, Ulpen I Gde Sukadana I Made Sudiana Indah Prabawati, Nurul Is Subekti, Mokhamad Jarwo Jeni Joni Hidayat, Joni Ketut Atmaja Johny Artha Khairul Khairul Hudha Nasution Kikin H Mutaqin Krisnawati, Dyah Ika Kurnia Setiawan Widana Kurnia, Deva Arya Leni Lina Rosmayanti Lisdawati, Ariani Listyaningrum, Trisna Avi Lukman Nulhakim M. Ficky Duskarnaen M. Safrodin M. Syafiq Roikhan Maulana Mar'atus Solihah, Rizka Ayu Masdar Masyhar MEITY SURADJI SINAGA Melkisedek Melvien Zainul Asyiqien Mohamad Fajar Farid Amrulloh Mohammad Amin Mohammad Saeful Amin Mokhamad Is Subekti Monica Monita Nur Shabrina Muh. Tajab muhammad alfi syahrin Muhammad Ilham Aziz MUHAMMAD IQBAL TAWAQAL Muhammad Jamal Muhammad Nur Afandy Muhammad Oktoda Noorrohman Muhammad Zulkifli Mulyani, Yayu Mundir, Ahmad Murien Nugraheni Muslich Muslich, Muslich Mustakim Mu’awanah, Frida Rosidatul Napiudin Negara, Akbar Kusuma Neng Ayu Herawati Ngadenin Ningtias, Dieta Wahyu Asry Novida, Irma Nugraha, Andronicus Christian Nulhakim, Lukman Nunik Madyaningarum, Nunik Nur Fadlilah, Reina Iranti Nuraini Nurhidayatuloh, Farhan Nurhikmah Mutmainna Sari Nurliyani Nurliyani NURUL AZIZAH Nurul Mawaddah Nurul Nisa Habibah Nurul Setiani Prasetya Adhi, Bambang Pratama, Aziz Yulianto Pratiwi, Ambar Pratiwi, Fadiah Purnama Sari, Citra Purwandito, Meilandy Putri, Elsa Lolita Rachael, Yoshi Rachmanu, Fatkur Ratna Wirawati Rosyida Ratna Wirawati Rosyida Reni Resa Yolanda Resa Yolanda Retnaningsih, Endang Rianto Ridho, Akhmad Rizky Novridoni Rohayani, Mei Roza Yuniza Putri rudiyanto Saepurohman, Ferdi Saifullah Azhar Saifulloh Azhar Samidi Sanyoto Saputri, K. W. Satria Pradana Rizki Yulianto Satria Pradana Rizky Yulianto Satyaguna Rakhmatulloh Septiana Anggraini, Septiana Shafa Sya’airillah Shinta Fadhilahsari Sigit Sudjatmiko, Sigit Sili Sabon, Simon Sirateman, Selamat Sistiani, Catur Rahma Siti Rohmah Siti Rosyidatul Ulwiyah SJAFIATUL MARDLIYAH Soeleman, Arief SRI HENDRASTUTI HIDAYAT Suhadi Suharjo, Usman Kris Joko Sukarjo, Entang Inoriah Sulton Ibrahim Sumaryoto Supanjani Supatman Supriadi Supriadi, Iyus Suryo Wiyono Susanto, Hendi Suseno, Doni Suwarno, Panji Swardiantara Silalahi syafrizal Syafrizal Fuady Tauvana, Ade Tayane, Rosalin T Thoriq Nurchaidir Tunjung Pamekas, Tunjung Turmudi, Agung Untari Untari Utami, Kartika Warsito Wibowo Yunanto, Prasetyo Wibowo, Nanang Roni Widi Amaria Wijaya, Aji Wira Manggala, Dimas Wira, Dimas Wiwin Yulianingsih wiyanto, Agung Wuri Prameswari Yudhistira, Arga YULIATI Zahra, Atiqah Luthfi Anawati Zakariyah, M Fahmi Zikri, Ahmad Zoehry, Mochammad Zulkurnia, Ari zumaroh, siti