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All Journal Journal of Engineering and Technological Sciences Jurnal Geosaintek JOURNAL ONLINE OF PHYSICS Al-Kimia Journal of Appropriate Technology for Community Services
Yekti Widyaningrum
Jurusan Fisika, Universitas Bangka Belitung
Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Physics

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Deasetilasi Kitin Cangkang Rajungan (Portunus pelagicus) Menjadi Kitosan Menggunakan Iradiasi Microwave Robby Gus Mahardika; Muhammad Jumnahdi; Yekti Widyaningrum
Al-Kimia Vol 8 No 2 (2020): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v8i2.7999

Abstract

The crab shell (Portunus pelagis) is still an untapped waste, especially on Bangka Island. Actually, this shell has a high value because there is chitin and chitosan. Chitosan is a biopolymer which has recently been developed into adsorbents, membranes and edible films. The deacetylation process of chitin will be the key to the quality of chitosan produced. Therefore, the purpose of this study is to see the effect of the chitin deacetylation process into chitosan using a microwave. Microwave deacetylation process is carried out with various time variations at 1200 W and 100oC. Characterization and degree of deacetylation (DD) of chitosan crab were analyzed by Fourier Transform Infrared (FTIR) spectroscopy. The results showed that deacetylation using conventional methods for 120 minutes at a temperature 100oC had DD 76.67% while deacetylation using microwave for 40 minutes at a temperature of 100oC had a DD  77.89%. Microwave deacetylation is three times faster than conventional methods.
Self-Potential Method to Assess Embankment Stability: A Study related to the Sidoarjo Mud Flow Sungkono Sungkono; Masithoh N. Wasilah; Yekti Widyaningrum; Wildan M. Hidayatullah; Fandi A. Fathoni; Alwi Husein
Journal of Engineering and Technological Sciences Vol. 52 No. 5 (2020)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2020.52.5.8

Abstract

The stability of an embankment is generally influenced by a number of factors, such as deformation, fractures, overtopping, seepage, etc. Fractures and seepage are commonly found in the LUSI (Sidoarjo mud flow) embankment. In this study, analysis of self-potential (SP) data was applied to identify fractures and seepage in the LUSI embankment. Noise-Assisted Multivariate Empirical Mode Decomposition (NA-MEMD) and Continuous Wavelet Transform (CWT) were applied to determine the location of seepage and fractures in the subsurface based on SP data. The results were correlated with the 2D direct current resistivity (DCR) method, which showed that both methods worked well and were compatible in detecting and localizing fracture and seepage in the LUSI embankment.
Aplikasi Filter EEMD Untuk Meningkatkan Kualitas Data VLF-EM Studi Kasus: Estimasi Lokasi Gorong-Gorong Di Kampus ITS Surabaya Yekti Widyaningrum; A.M Miftahul Huda; Sungkono Sungkono
Jurnal Geosaintek Vol 4, No 3 (2018)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (593.609 KB) | DOI: 10.12962/j25023659.v4i3.4493

Abstract

Eksplorasi bawah permukaan menggunakan Very Low Frequency Electromagnetics (VLF-EM) telah dilakukan untuk menentukan rongga bawah tanah (gorong-gorong). Untuk mempertajam hasil eksplorasi dan mereduksi gangguan diaplikasikan filter EEMD. Data hasil filter diinterpretasikan secara kualitatif menggunakan filter Karous-Hjelt. Hasil Interpretasi filter Karous-Hjelt menunjukkan bahwa anomali bawah permukaan terdapat pada 25-35 meter dari titik mengukuran awal dan kedalaman 3-6 meter. Anomali tersebut menyatakan lokasi gorong-gorong di lokasi pengukuran
SEBARAN MINERAL IKUTAN TIMAH DI WILAYAH BEKAS PENAMBANGAN MENGGUNAKAN METODE SELF POTENTIAL (SP) SEBAGAI INDIKASI AWAL KETERDAPATAN LOGAM TANAH JARANG (LTJ) Tri Kusmita Kusmita; Anisa Indriawati; Yekti Widyaningrum
JOURNAL ONLINE OF PHYSICS Vol. 7 No. 2 (2022): JOP (Journal Online of Physics) Vol 7 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v7i2.18282

Abstract

Indonesia mempunyai potensi besar untuk menjadi produsen logam tanah jarang (LTJ) yang semakin dibutuhkan untuk industri dalam negeri ataupun global. Data pusat sumber daya geologi menyebutkan bahwa cadangan mineral LTJ saat ini di Indonesia diperkirakan sekitar 200.000 ton. Endapan LTJ yang berasosiasi dengan batuan granitik dijumpai pada jalur timah Indonesia, salah satunya Bangka Belitung. Mineral tanah jarang (monasit, xenotime dan zircon) diasosiasikan dengan deposit alluvial timah, uranium dan emas. Di kepulauan Bangka Belitung mineral tanah jarang ditemukan sebagai mineral ikutan dari proses penambangan dan ekstraksi mineral timah. Penelitian ini dilakukan untuk melihat sebaran mineral ikutan timah jarang menggunakan metode self potential dan menganalisis indikasi keterdapatan mineral logam tanah jarang menggunakan metode XRF. Metode Self potential dilakukan dengan menerapkan desain akuisisi fixed based. Pengambilan sampel uji XRF dilakukan secara acak yang tersebar di beberapa titik di sepanjang area penelitian. Hasil penelitian menunjukkan bahwa Sebaran mineral di daerah Danau Ampar tidak tersebarsecara merata. Mineral Quartz Vein dan Pegmatite (+10 hingga + 70 mV) sebagai mineral pembawa bijih timah mendominasi bagian Timur ke arah Baratlaut dan Barat hingga Baratlaut. Berdasarkan metode XRF terdapat indikasi keterdapatan elemen unsur tanah jarang Y, Eu dan Nd dengan kemungkinan mineral LTJ berupa Monazite dan Xenotime.
SOSIALISASI TEKNIK PENYIMPANAN PRODUK HASIL TANGKAPAN LAUT DENGAN METODE BEKU DI DESA PENYAK Fitri Afriani; Yekti Widyaningrum; Widodo Budi Kurniawan; Herman Aldila; Yuant Tiandho
Journal of Appropriate Technology for Community Services Vol. 1 No. 2 (2020)
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jattec.vol1.iss2.art8

Abstract

In this paper, the location that is targeted for community service activities is Penyak Village, Koba Sub-District, Central Bangka Regency. The majority of the profession of the Penyak Village community are fishermen because the village is directly adjacent to the South China Sea. Maritime resources in Penyak Village are quite abundant including various types of fish, shellfish and small crab. But most people who market these resources have not used techniques for storing fishery products. Therefore, it is feared that the fishery products will decline in quality. The solution offered to this community service is the socialization of frozen fishery product storage. In addition, in order for the community to directly utilize it, the freezer box equipment was provided to Penyak Village. Through the evaluation process, it is known that the freezer box provided can be utilized by Penyak Village community, especially for storing food products.
Pelatihan Pemanfaatan Limbah Plastik Menjadi Berbagai Kreasi Daur Ulang Bagi Masyarakat Desa Penyak Yuant Tiandho; Herman Aldila; Yekti Widyaningrum; Tri Kusmita; Anisa Indriawati; Widodo Budi Kurniawan; Fitri Afriani
Journal of Appropriate Technology for Community Services Vol. 2 No. 2 (2021)
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jattec.vol2.iss2.art2

Abstract

As an archipelago, handling plastic waste in the Province of Bangka Belitung Islands is an aspect that needs to be taken seriously. Apart from being focused on developing tourist areas, plastic waste will easily be carried to the sea and prone to be degraded into microplastics, often consumed by marine animals. This community service activity focuses on Penyak Village, Kec. Koba, Kab. Central Bangka, Bangka Belitung Islands. To solve the plastic problem in that location, the community service team conducted training for the community, especially for Pendidikan Kesejahteraan Keluarga (PKK) members, related to processing plastic waste into various recycled creations such as bags, pencil cases, and different kinds of souvenirs. The training program is carried out by providing materials and direct training to increase the understanding and skills. To broaden people's insights, the team conducted training with the Ecoplantstic start-up, which focuses on developing waste-based products. Through the evaluation, it is known that the training provided can improve the knowledge and skills of the community in processing plastic waste into various recycled creations, and several participants plan to develop the skills acquired for entrepreneurial purposes.
SUSEPTIBILITAS MAGNETIK SISTEM PANASBUMI NON VULKANIK DESA TERAK MENGGUNAKAN METODE GEOMAGNETIK Tri Kusmita; Yuant Tiandho; Yekti Widyaningrum; Umi Alawiyah
Jurnal Geosaintek Vol 9, No 3 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v9i3.15563

Abstract

Geothermal in Bangka Belitung islands are classified as radiogenic type of non-volcanic geothermal. Geothermal in this area was formed due to granite rocks that have been fractured, folded or faulted. Geothemal Terak has a surface temperature of 550C - 61.80C with a water discharge of 0.2 liters/second. This research aims to identify the forming rocks of geothermal system at Terak village based on magnetic field anomalies. Data acquisition was measured using a Proton Precession Magnetometer (PPM) along 2.5 km with 100 m spacing and 500 m spacing between lines. Data processing was analyzed using diurnal correction, IGRF correction, RTE (Reduce to the Equator) correction, anomaly separation using Upward Continuation. Modeling performed by applying 2D Inverse Modeling. The results indicated that the reservoir rock in Terak area with non-volcanic geothermal system was granite with susceptibility 42 x 103 - 49 x 103. The depth of the reservoir rock was partially at a depth of 30 - 125 meters above sea level and some were exposed on the surface (0 - 80 meters above sea level). Reservoir rocks are scattered in the northwest area of the study.
IDENTIFIKASI KETIDAKSTABILAN TANGGUL WADUK DESA KEMUJA KABUPATEN BANGKA MENGGUNAKAN METODE SELF-POTENTIAL (SP) Dea Amelia; Tina Asisah; Indah Santya; Tri Kusmita; yekti widyaningrum
JOURNAL ONLINE OF PHYSICS Vol. 9 No. 2 (2024): JOP (Journal Online of Physics) Vol 9 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v9i2.8266

Abstract

Waduk merupakan suatu bangunan buatan yang berfungsi untuk menampung air. Penyebab utama yang dapat menyebabkan kerusakan pada badan tanggul biasanya adalah keruntuhan tanggul yang disebabkan oleh ketidakstabilan tanggul tersebut. Ketidakstabilan tanggul dapat terjadi karena adanya rembesan air yang menyebabkan tanah menjadi jenuh air. Tanggul Waduk Desa Kemuja hingga saat ini terdapat beberapa retakan pada badan tanggul yang kemungkinan dapat menyebabkan keruntuhan tanggul apabila tidak ditangani lebih lanjut. Penelitian ini mengidentifikasi kondisi lapisan tanah pada tanggul agar dapat mengetahui ketidakstabilan tanggul Waduk di Desa Kemuja menggunakan metode geolistrik self-potential (SP). Penelitian ini dilakukan dengan mengukur 3 lintasan penelitian. Berdasarkan hasil penelitian, pada lintasan 1 terdapat ketidakstabilan tanggul pada jarak 110 m dengan nilai potensial sebesar -11,1 mV dan pada jarak 125 m sebesar -10,8 mV, pada lintasan 2 terdapat pada jarak 155 m sebesar -1,3 mV, dan pada lintasan 3 terdapat pada jarak 55 m sebesar -4,1 mV. Ketidakstabilan tanggul menunjukan anomali negatif ketika rembesan air masuk ke tanggul. Zona ini dapat menyebabkan keruntuhan sehingga dapat mengganggu kestabilan tanggul. Berdasarkan hasil yang diperoleh, dapat disimpulkan bahwa metode self-potential (SP) dapat digunakan sebagai solusi tercepat untuk mencegah kerusakan tanggul berdasarkan identifikasi ketidakstabilan tanggul.
Co-Authors A.M Miftahul Huda Ali Djamhuri Alwi Husein Anisa Indriawati Dea Amelia Fandi A. Fathoni Fitri Afriani Herman Aldila Indah Santya Jumnahdi, Muhammad Masithoh N. Wasilah Sungkono, B.J. Santosa Tina Asisah Tri Kusmita Umi Alawiyah Widodo Budi Kurniawan Wildan M. Hidayatullah Yuant Tiandho