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All Journal Jurnal Ilmu Lingkungan Jurnal Penelitian dan Pengembangan Sains dan Humaniora (JPPSH) Jurnal Teknik Kimia TEKMAPRO Journal of Industrial Engineering and Management Scan : Jurnal Teknologi Informasi dan Komunikasi JURNAL INTEGRASI PROSES International conference on Information Technology and Business (ICITB) Konversi IJEMS (Indonesian Journal of Environmental Management and Sustainability) Chemistry Indonesian Journal of Chemical Research Journal of Education Action Research Jurnal Inovasi Teknik Kimia G-Tech : Jurnal Teknologi Terapan Nusantara Science and Technology Proceedings Quimica : Jurnal Kimia Sains dan Terapan Jurnal Teknik Kimia Indonesia AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Seminar Nasional Ilmu Terapan Serambi Engineering
Ni Ketut Sari
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology Public Health Social Sciences Other

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Penerapan Model Pembelajaran Tipe Cooperative Integrated Reading and Compotition (CIRC) sebagai Upaya Meningkatkan Prestasi Belajar Bahasa Indonesia Sari, Ni Ketut
Journal of Education Action Reseach Vol 4 No 3 (2020): August 2020
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jear.v4i3.27234

Abstract

Tujuan penulisan penelitian tindakan kelas ini adalah untuk mengetahui apakah penggunaan Model Pembelajaran Tipe Cooperative Integrated Reading and Compotition (CIRC) dapat meningkatkan prestasi belajar siswa.  Penelitian ini dilaksanakan di SMP Negeri 1 Ubud di kelas IX E Semester I Tahun Pelajaran 2018/2019 yang kemampuan siswanya untuk mata pelajaran Bahasa Indonesia masih rendah. Metode pengumpulan datanya adalah tes prestasi belajar. Metode analisis datanya adalah deskriptif. Hasil yang diperoleh dari penelitian ini adalah penggunaan Model Pembelajaran Tipe Cooperative Integrated Reading and Compotition (CIRC) dapat meningkatkan prestasi belajar siswa. Ini terbukti dari hasil yang diperoleh pada pada awalnya 66,94 setelah diberikan tindakan pada siklus I meningkat menjadi 72,77, dan pada siklus II meningkat lagi menjadi 80,13. Kesimpulan yang diperoleh dari penelitian ini adalah penggunaan Model Pembelajaran Tipe Cooperative Integrated Reading and Compotition (CIRC) dapat meningkatkan prestasi belajar Bahasa Indonesia siswa kelas IX E SMP Negeri 1 Ubud.  
Komitmen Kerja, Lingkungan Kerja Nonfisik, dan Work Interference With Family terhadap Kinerja Pegawai pada Badan Kepegawaian dan Pengembangan Sumber Daya Manusia Suwandana, I Made Adi; Pebriyanthi, Ni Ketut Sari
Jurnal Penelitian dan Pengembangan Sains dan Humaniora Vol. 5 No. 2 (2021): Juli
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (480.77 KB) | DOI: 10.23887/jppsh.v5i2.35529

Abstract

Banyak pegawai yang masih menjaga jarak dan membanding-bandingkan satu sama lain, sehingga lingkungan kerja menjadi tidak terjalin dengan harmonis. Terkadang pegawai menjaga jarak dengan atasannya karena merasa takut dengan gaya kepemimpinan atasannya yang keras dan komunikasi bawahan dengan atasan tidak terjalin baik. Tujuan penelitian ini adalah untuk menganalisis pengaruh secara parsial atau simultan komitmen kerja, lingkungan kerja nonfisik dan work nterferece with family terhadap kinerja pegawai pada Badan Kepegawaian dan Pengembangan Sumber Daya Manusia. Model penelitian yang digunakan adalah metode penelitian kuantitatif. Populasi dalam penelitian ini berjumlah 68 orang. Teknik sampling adalah probability sampling  dengan sebanyak 67 orang responden. Data dianalisis dengan menggunakan uji asumsi klasik, analisis regresi linier berganda, analisis determinasi, uji signifikansi simultan (F-test) dan uji signifikansi parsial (t-test). Hasil penelitian menunjukkan nilai f-hitung 5,682 > dari nilai f-tabel 1,518 dan f-hitung dengan nilai signifikansi 0,002 yang menunjukkan bahwa variabelkomitmen kerja, lingkungan kerja nonfisik dan work interference with family berpengaruh positif dan signifikan terhadap kinerja pegawai pada Badan Kepegawaian Dan Pengembangan Sumber Daya Manusia. Implikasi penelitian ini dapat memberikan evaluasi dalam meningkatkan kinerja karyawan.
Estimasi Emisi Gas dari Kegiatan Landfilling di TPA Bengkala dengan Model LandGEM Nurjaya, Luh Asri Ningsih Widhi; Nurhediana, Silvana Dwi; Saputro, Erwan Adi; Jalil, Mohd Jumain; Sari, Ni Ketut
Jurnal Ilmu Lingkungan Vol 23, No 2 (2025): March 2025
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.23.2.295-304

Abstract

Pengelolaan sampah di TPA Bengkala, Kabupaten Buleleng, menjadi tantangan utama pemerintah daerah karena peningkatan jumlah penduduk dan aktivitas ekonomi yang meningkatkan volume sampah dan emisi gas. Penelitian ini bertujuan untuk mengestimasi emisi gas rumah kaca dari Tempat Pembuangan Akhir (TPA) Bengkala di Kabupaten Buleleng menggunakan model LandGEM. Data karakteristik TPA Bengkala, seperti luas lahan, metode landfilling, dan timbulan sampah dikumpulkan untuk digunakan dalam model LandGEM. Pemodelan ini memperkirakan produksi gas berdasarkan data timbulan sampah. Hasil menunjukkan bahwa emisi gas total, metana, CO2 dan NMOC meningkat secara signifikan dari tahun 2016 hingga mencapai puncaknya pada tahun 2034, sebelum akhirnya menurun. Pada tahun 2034, total emisi gas mencapai 14,2433 Gg/Tahun dengan skenario CAA-Konvensional dan 7,2238 Gg/Tahun dengan inventory default. Gas metana pada skenario CAA-Konvensional mencapai puncaknya sebesar 3,8045 Gg/Tahun pada tahun 2034, sementara inventory default mencapai 1,9296 Gg/Tahun, Gas karbondioksida pada skenario CAA-Konvensional mencapai puncaknya sebesar 10,4387 Gg/Tahun pada tahun 2034, sedangkan untuk inventory default adalah 5,2943 Gg/Tahun, Gas NMOC pada skenario CAA-Konvensional mencapai puncaknya sebesar 0,0245 Gg/Tahun pada tahun 2034, dua kali lipat dibandingkan dengan inventory default yang mencapai 0,0124 Gg/Tahun. Penelitian ini menyimpulkan bahwa pemantauan dan pengelolaan emisi gas dari TPA Bengkala sangat penting untuk mengurangi dampak lingkungan dan memanfaatkan potensi gas metana sebagai sumber energi alternatif. Implementasi strategi mitigasi yang efektif berdasarkan hasil model LandGEM dapat membantu dalam pengembangan pengelolaan limbah yang berkelanjutan dan pengurangan emisi gas rumah kaca.
Optimization of Glucose Recovery from Saccharomyces cerevisiae Waste via Hydrolysis Using RSM Esnandhik, Ubaidillah Bramantyo; Azzahra, Fatimah; Sari, Ni Ketut
G-Tech: Jurnal Teknologi Terapan Vol 9 No 2 (2025): G-Tech, Vol. 9 No. 2 April 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i2.6581

Abstract

The liquid waste resulting from the regeneration of Saccharomyces cerevisiae contains a significant amount of starch, which has the potential to be optimized for glucose production. This study aims to optimize glucose levels from the liquid waste using hydrolysis with the Response Surface Methodology (RSM). The tested variables include the volume of Saccharomyces cerevisiae regeneration liquid waste (mL): 300; 600; 900; 1200; and 1500, as well as water volume (mL): 200; 400; 600; 800; and 1000. RSM with a Central Composite Design (CCD) requires 13 experimental data combinations of variables. The hydrolysis results were analyzed using RSM to determine the effect of variables and their interactions on glucose content. Optimization of glucose levels using RSM resulted in an optimal glucose content of 23.5% at a liquid waste volume of 1378.79 mL and a water volume of 1.5238 mL, based on an analysis using Minitab 19 software. Glucose content testing from 25 data points showed the highest level at 27% for a liquid waste volume of 900 mL and a water volume of 600 mL, while spectrophotometry recorded a peak glucose content of 29.7% under the same variables. The findings of this study can be the basis for developing a more efficient hydrolysis process that produces glucose which can help industry to make waste processing methods more efficient and increase the added value of by-products.
Optimasi Magnesium Silikat Berbahan Bittern dan Sodium Silikat Atha Mardhi Maulana; Syaiba Qurrotul Aini; Ni Ketut Sari
Jurnal Serambi Engineering Vol. 10 No. 3 (2025): Juli 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Magnesium silicate (MgSiO3) is an inorganic compound formed from the reaction between magnesium and silicate. This study is all about making the process of forming magnesium silicate from bittern using the precipitation method as good as it can be. Bittern is a liquid waste from the salt industry that is rich in magnesium ions. In this study, we lovingly crafted magnesium hydroxide (Mg(OH)2) by bringing bittern together with sodium hydroxide (NaOH), and then gently continuing to react with sodium silicate (Na2SiO3) to form magnesium silicate (MgSiO3). There are some differences in the molar ratio between NaOH: MgCl₂ and Mg(OH)₂: We used Na2SiO3 to figure out the best conditions for making the product. I'm so excited to share the results of the analysis with you! We found that the highest yield of 69,969% was obtained at a mole ratio of NaOH: MgCl₂ = 1:2 and Mg(OH)₂: Na2SiO3 = 1:1. We used X-Ray Fluorescence (XRF) to figure out the best mix of magnesium silicate, and it turned out to be a beautiful balance of 17% MgO and 71% SiO₂. This study is great news because it shows that adjusting the amount of reactant you use can make a big difference in how well magnesium silicate is produced. This opens up a lot of opportunities for using it in different industries.
Optimization of Flavonoid Compounds from Avocado Seeds Using Ethanol Solvent through Response Surface Methodology (RSM) Laurentcya, Treyna Dara; Fergilang, Jibraltar; Sari, Ni Ketut; Nurherdiana, Silvana Dwi
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 9 No. 2 (2025)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v9i2.742

Abstract

This research aimed to optimize the extraction of flavonoid compounds from avocado seeds (Persea Americana Mill.) using ethanol as a solvent through Response Surface Methodology (RSM). Avocado seeds are known to contain bioactive compounds, including flavonoids, which exhibit antioxidant properties. Extraction was performed via maceration using 96% ethanol, with varying extraction times (1–5 days) and seed powder-to-solvent ratios (10–50% w/v). The results demonstrated that prolonged extraction time and higher solvent ratios significantly increased flavonoid yield, peaking at 6.5090% (5 days, 50% w/v). RSM optimization (25 data points) identified optimal conditions at 4.99414 days and a 39.6367% w/v ratio, yielding 3.65815% flavonoids. GC-MS analysis detected degraded flavonoid derivatives (e.g., avocadenofuran), attributed to high-temperature processing. The study confirms ethanol-based maceration as an effective method for flavonoid extraction, with time and solvent ratio being critical factors. These findings support potential applications in the food and pharmaceutical industries for the development of antioxidant products. Contribution to Sustainable Development Goals (SDGs):SDG 3: Good Health and Well-beingSDG 9: Industry, Innovation, and InfrastructureSDG 12: Responsible Consumption and ProductionSDG 13: Climate Action
Optimization of Ethanol Purification by Adsorption Process Using Silica Gel with Response Surface Methodology Vinata, Restu Sebrina; Pratiwi, Firdiani Dwi; Sari, Ni Ketut
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7433

Abstract

Ethanol from the fermentation of sugar, cane, and biomass can be used as a renewable fuel, but it must be purified first with adsorption being an efficient method. This study aims to optimize ethanol purification using silica gel adsorption, investigating the effects of flow rates 0.1; 0.2; 0.3; 0.4; 0.5 ml/s and adsorbent weights 20, 30, 40, 50, 60 grams. Response Surface Methodology (RSM) with Central Composite Design (CCD) was used for optimization. The experimental results were input into Design-Expert 13 for RSM optimization using flow rate and adsorbent weight. The highest ethanol concentration of 99.8% was achieved at a flow rate of 0.1 ml/s and adsorbent weight of 60 grams. RSM optimization resulted in a concentration of 99.804% at a flow rate of 0.103 ml/s and silica gel weight of 59.818 grams. The results indicate that increasing adsorbent weight and decreasing flow rate significantly improve ethanol purity. Achieving 99.8% ethanol confirms the effectiveness of silica gel adsorption and supports the development of biofuels as renewable energy sources to reduce dependence on petroleum.
Glucose Synthesis from Imperata Cylindrica by Acid Hydrolysis Process Muhammad Ashfal Ashfiya; Ahmad Rizky Safrudin; Ni Ketut Sari; Rachmad Ramadhan Yogaswara
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 9 No. 2 (2025)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v9i2.752

Abstract

Imperata cylindrica, commonly known as alang-alang, is a fast-growing, abundant, and underutilised grass often considered a weed. However, its high cellulose content makes it a promising lignocellulosic biomass for renewable glucose production. This study explores the synthesis of glucose from Imperata cylindrica through acid hydrolysis, with the aim of utilizing this low-cost biomass as a sustainable raw material for bio-based products. The hydrolysis process was investigated using two main variables: hydrolysis time (1, 1.5, 2, 2.5, and 3 hours) and acid concentration (1%, 1.5%, 2%, 2.5%, and 3%). The resulting hydrolysates containing glucose were analyzed using a refractometer, UV-Vis spectrophotometer, and further optimized using Response Surface Methodology (RSM). The highest glucose content obtained by refractometer was 6.5%, while RSM predicted a maximum of 6.49%, and UV-Vis analysis showed 6.34%. All optimal results were achieved under the condition of 2.5 hours of hydrolysis time and a 3% acid concentration. These findings highlight the potential of Imperata cylindrica as a viable and sustainable feedstock for glucose production through acid hydrolysis, contributing to the development of alternative bio-resources. Contribution to Sustainable Development Goals (SDGs):SDG 6: Clean Water and SanitationSDG 11: Sustainable Cities and CommunitiesSDG 13: Climate ActionSDG 15: Life on Land
Analisis Lanskap Penelitian Remanufaktur dan Perilaku Konsumen: Studi Literatur Sistematis Sari, Komang Nickita; Anityasari, Maria; Sari, Ni Ketut
Tekmapro Vol. 19 No. 2 (2024): TEKMAPRO
Publisher : Program Studi Teknik Industri Universitas Pembangunan Nasional Veteran Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/tekmapro.v19i2.423

Abstract

Penelitian mengenai remanufaktur telah berkembang pesat dalam beberapa dekade terakhir seiring dengan meningkatnya perhatian terhadap keberlanjutan dan ekonomi sirkular. Remanufaktur adalah proses perbaikan dan peremajaan produk bekas sehingga produk tersebut dapat digunakan kembali dengan kualitas yang setara dengan produk baru. Proses ini membantu mengurangi limbah, penggunaan sumber daya alam, serta menawarkan solusi ekonomis bagi konsumen dan produsen. Namun, adopsi praktik remanufaktur menghadapi berbagai tantangan, terutama di negara berkembang seperti Indonesia, di mana pemahaman konsumen mengenai produk remanufaktur masih rendah dan persepsi terhadap produk murah sebagai produk berkualitas rendah masih dominan. Ketidakjelasan dalam definisi remanufaktur juga menjadi hambatan besar bagi peneliti dan praktisi, menyebabkan kesulitan dalam melakukan penelitian yang efektif dan menyebarkan pengetahuan tentang proses tersebut. Oleh karena itu, penelitian ini dilakukan untuk memberikan pemahaman yang lebih mendalam mengenai lanskap penelitian remanufaktur yang terkadang masih ambigu dan membutuhkan eksplorasi lebih lanjut. Dengan menggunakan metode eksploratif dan systematic literature review, penelitian ini bertujuan untuk mengidentifikasi tren terkini dan isu-isu penting yang mempengaruhi adopsi praktik remanufaktur, serta memberikan wawasan mengenai perbedaan perilaku konsumen di negara maju dan berkembang terhadap produk remanufaktur.
Optimization of Acetone Concentration and Reflux Ratio for Enhanced Oil Extraction from Spent Bleaching Earth: A Response Surface Methodology Approach Monica, Clarissa Putri; Anggraeni, Verendria Putri Caesar; Sumada, Ketut; Sari, Ni Ketut; Pujiastuti, Caecilia
Indonesian Journal of Environmental Management and Sustainability Vol. 9 No. 4 (2025): December
Publisher : Magister Program of Material Science, Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijems.2025.9.4.183-191

Abstract

Spent bleaching earth with an oil content exceeding 3% is classified as hazardous and toxic waste, requiring appropriate processing prior to environmental disposal. Extraction is one effective method for processing spent bleaching earth. This study focuses on the optimization of oil extraction from spent bleaching earth using acetone as a solvent, specifically analyzing the effects of solvent concentration and reflux ratio on oil recovery efficiency and evaluating the quality of recovered bleaching earth for potential reuse in vegetable oil refining processes. The extraction method employed was soxhlet extraction using acetone as the solvent. Five different acetone concentrations (50%, 60%, 70%, 80%, and 90%) were tested in combination with five reflux ratios (2, 3, 4, 5, and 6), creating a total of 25 experimental conditions. Response surface methodology (RSM) was utilized to optimize these parameters and identify the ideal conditions for maximum oil recovery. The experimental design and statistical analysis were conducted using Design Expert 13.0.5.0 software. The quality of recovered bleaching earth was assessed against Indonesian National Standards (SNI) for potential reuse applications. The optimization results indicated optimal conditions of 69.15% acetone concentration and a reflux ratio of 4, yielding a maximum oil recovery rate of 17.52%. Analysis of the recovered bleaching earth showed that while it met most SNI standards for bleaching earth quality parameters, the pH remained acidic (below neutral), indicating that alkaline pretreatment would be necessary before the material could be effectively reused in vegetable oil bleaching processes. The study demonstrates that acetone-based soxhlet extraction can effectively recover oil from spent bleaching earth while producing a secondary product suitable for reuse after appropriate pH adjustment.
Co-Authors Ahmad Rizky Safrudin Anggraeni, Verendria Putri Caesar Asif Faroqi Atha Mardhi Maulana Athobarani, Akmal Bachtiar, Sofi Baihaqi, Muhammad Nizammudin Dimas Hafidz Maulana Dira Ernawati Erwan Adi Saputro Esnandhik, Ubaidillah Bramantyo Fadhilah, Said Ahmad Fathoni, Muhamad Uman Fatimah Azzahra Fatkhurin, Elma Fergilang, Jibraltar Fernanda Andika Arya Revandana Gemilang, Surya Jalil, Mohd Jumain Jariyah Jariyah Jonathan Fayol Sinaga Ketut Sumada Caecillia Pujiastuti Khurniawati, Khurniawati Kusuma Wardhani Mas’udah Laurentcya, Treyna Dara Lestari, Rowina Maria Anityasari Monica, Clarissa Putri Muhammad Ashfal Ashfiya Nurhediana, Silvana Dwi Nurjaya, Luh Asri Ningsih Widhi P, Eva Yulia Pratiwi, Firdiani Dwi Pujiastuti, Caecilia Rachma Putri Salsya Dilla Rachmad Ramadhan Yogaswara Saputra, Wahyu S J Sari, Komang Nickita Shafira Suci Utami Silvana Dwi Nurherdiana Suryanto, Tri Lahtif Mardi Suwandana, I Made Adi Syaiba Qurrotul Aini Vinata, Restu Sebrina Wahyuningtiyas, Retno Wijaya, Miftachul Yustica Chandra Kania