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All Journal IJCCS (Indonesian Journal of Computing and Cybernetics Systems) ILMU KELAUTAN: Indonesian Journal of Marine Sciences BULETIN OSEANOGRAFI MARINA METANA Prosiding Seminar Nasional MIPA Management of Aquatic Resources Journal (Maquares) Journal of Marine Research Jurnal Pengajaran MIPA Jurnal Buana Informatika Jurnal Pendidikan IPA Indonesia Jurnal Teknik Kimia Jurnal Pengkajian dan Pengembangan Teknologi Pertanian Jurnal Pengajaran Matematika dan Ilmu Pengetahuan Alam PAWIYATAN Bioedukasi: Jurnal Pendidikan Biologi Jurnal Fisika Unand Jurnal Penelitian dan Pembelajaran IPA Indonesian Journal of Cancer Jurnal Kelautan Tropis Unnes Science Education Journal JIKO (Jurnal Informatika dan Komputer) Journal Of Vocational Health Studies Jurnal Pengabdian Masyarakat AbdiMas Bawal : Widya Riset Perikanan Tangkap Jurnal Pendidikan Ekonomi (JURKAMI) Voice of Wesley: Jurnal Ilmiah Musik dan Agama JPPS (Jurnal Penelitian Pendidikan Sains) Jurnal E-Bis: Ekonomi Bisnis Jurnal Ilmiah Wijaya Babali Nursing Research Caring : Indonesian Journal of Nursing Science Emphaty Cons : Journal of Guidance and Counseling Journal of Tourism Economics and Policy Golden Ratio of Marketing and Applied Psychology of Business AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Pawiyatan Edubiologica Jurnal Penelitian Ilmu dan Pendidikan Biologi Jurnal Kebidanan, Keperawatan dan Kesehatan (J-BIKES) Education Journal: Journal Educational Research and Development Journal Of Artificial Intelligence And Software Engineering MANGGALI Ekobisman : Jurnal Ekonomi Bisnis Manajemen Journal Innovations Computer Science Journal Serambi Engineering (JSE) Advance Sustainable Science, Engineering and Technology (ASSET) INOVTEK Polbeng - Seri Informatika Journal of Midwifery Tiara Bunda Edubiologica: Jurnal Penelitian Ilmu dan Pendidikan Biologi BAABU AL-ILMI: Ekonomi dan Perbankan Syariah Quality
Sri Redjeki
Prodi Farmasi, Poltekkes Bandung
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Preparation of Calcinite Fertilizer from Golden Snail Shells by Calcination and Crystallization Processes Hadi, Nur Halizah; Muhaimin, M. Hadid; Redjeki, Sri
Advance Sustainable Science Engineering and Technology Vol. 6 No. 4 (2024): August-October
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v6i4.788

Abstract

The golden apple snail is a significant pest that damages crops and can lead to crop failure because it has a habit of consuming various soft plants, including young rice plants. Golden snail shells have a high calcium carbonate content of around 60.56%. Large calcium content can be used as a source for the production of calcium nitrate fertilizer. The stages in making calcinit fertilizer are washing the shell of gold snails and drying for 1-2 days. After that, size reduction is carried out to 50 mesh. After that, the calcination process was carried out with a variable temperature of 700,750,800,850,900 ℃ for 4 hours. The calcined shell is dissolved with HNO3 with a variable of 1-5 N for 1 hour. After that the solution is filtered from impurities and neutralized to pH 7. After that the solution is crystallized into white crystals. The largest Ca and N content was obtained at a calcining temperature of 900 and HNO3 5 N concentrations, namely Ca of 21.94% and N of 16.52%. The results showed that the higher the calcining temperature and the higher the HNO3 content, the higher the Ca content and N content
Evaluation of Multi-Algorithm Clustering for Marketplace MSME Segmentation Using a Big Data Analytics Approach Taufan, Anas; Redjeki, Sri
INOVTEK Polbeng - Seri Informatika Vol. 10 No. 3 (2025): November
Publisher : P3M Politeknik Negeri Bengkalis

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35314/k9gn7n75

Abstract

The rapid development of the digital economy has significantly driven MSME activity on marketplaces like Tokopedia, generating vast heterogeneous datasets. This study conducted a comparative evaluation of six clustering algorithms, including K-Means, Agglomerative Clustering, and GMM, using the Silhouette Score, Davies–Bouldin Index (DBI), and Calinski–Harabasz Index (CHI). Using a standardized Tokopedia MSME dataset from Yogyakarta, empirical results showed Silhouette scores ranging from 0.050 to 0.057, DBI from 0.45 to 0.53, and CHI from 950 to 1310. Although indicating low absolute cluster separation, these values facilitated meaningful relative comparisons. Among the tested algorithms, agglomerative clustering with Ward linkage demonstrated the best relative performance and consistency. Metric variability was examined through multiple runs to ensure stability. The analysis identified three segments: high-performing, medium-performing, and high-potential MSMEs, serving as a foundation for data-driven strategies. These findings underscore the necessity of a consistent multi-metric evaluation approach in MSME big data clustering studies.
Sintesis dan Karakterisasi Nanopartikel Perak Berbasis AgNO3 dan Ekstrak Daun Lamtoro (Leucaena Leucocephala) Untuk Aktivitas Antibakteri Ayu Rosyida Zam Zam; Amin, Nashrul; Redjeki, Sri
Jurnal Serambi Engineering Vol. 11 No. 1 (2026): Januari 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

This study aims to synthesize and characterize silver nanoparticles (AgNPs) based on silver nitrate (AgNO₃) using Leucaena leucocephala leaf extract as a natural bioreducing agent, and to determine the effects of AgNO₃ concentration and stirring time on their morphology, stability, and antibacterial activity. The synthesis was carried out using AgNO₃ concentrations of 1.5, 2.5, 3.5, 4.5, and 5.5 mM, with stirring times of 2, 3, and 4 hours at room temperature. UV-Vis analysis showed that a concentration of 5.5 mM and stirring time of 3 hours produced a maximum absorption peak at approximately 430 nm, indicating the successful formation of stable silver nanoparticles. SEM analysis revealed spherical-shaped AgNPs with particle sizes ranging from 50 to 100 nm. The antibacterial activity test against Staphylococcus aureus ATCC 25923 showed an inhibition zone of 11.67 mm at 100% concentration, categorized as strong antibacterial activity. Therefore, the combination of 5.5 mM AgNO₃ concentration and 3 hours of stirring time was determined to be the optimum condition for producing stable silver nanoparticles with high antibacterial potential.
Sintesis Asam Laktat dari Kulit Nangka dengan Proses Simultanious Saccharification and Fermentation (SSF) Sunil Wahidah, Tiara Anggarani; Handayani, Latifah Fitri; Redjeki, Sri
Jurnal Serambi Engineering Vol. 11 No. 2 (2026): April 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Kulit nangka merupakan limbah biomassa yang berpotensi dimanfaatkan sebagai bahan baku alternatif produksi asam laktat melalui proses biokonversi, karena mengandung lignoselulosa yang berpotensi dikonversi menjadi gula sederhana. Penelitian ini bertujuan untuk mensintesis asam laktat dari kulit nangka serta menganalisis pengaruh massa substrat dan lama waktu Simultaneous Saccharification and Fermentation (SSF) terhadap kadar asam laktat guna menentukan kondisi terbaik proses. Proses SSF dilakukan menggunakan Aspergillus niger sebagai agen sakarifikasi dan Lactobacillus plantarum sebagai agen fermentasi setelah tahap delignifikasi. Variasi massa substrat yang digunakan adalah 3, 5, 7, 9, dan 11 gram dengan lama SSF 12, 24, 36, 48, dan 72 jam. Kadar asam laktat dianalisis menggunakan metode titrasi asam–basa, sedangkan pH diamati selama proses berlangsung. Analisis statistik menggunakan ANOVA dua arah menunjukkan bahwa massa substrat dan lama waktu SSF berpengaruh signifikan terhadap kadar asam laktat dengan nilai p-value < 0,05. Kadar asam laktat tertinggi sebesar 2,10% diperoleh pada massa substrat 5 gram dengan waktu SSF 48 jam, disertai penurunan pH yang mengindikasikan peningkatan aktivitas fermentasi. Hasil penelitian ini menunjukkan bahwa proses SSF efektif dalam menghasilkan asam laktat dari kulit nangka dan berpotensi dikembangkan sebagai metode pemanfaatan limbah biomassa yang bernilai ekonomis dan ramah lingkungan.
Digital Transformation of Islamic Universities for Lecturer Performance Based on Decision Support System Nurohman, Muhamad; Andriyani, Widyastuti; Redjeki, Sri
QUALITY Vol 12, No 2 (2024): QUALITY
Publisher : Pascasarjana IAIN Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21043/quality.v12i2.30037

Abstract

Digital Transformation of Islamic Universities for Lecturer Performance Based on Decision Support System. The research offers the utilization of digital transformation along with the development of information and communication technology today needs to be done to improve the quality of education, especially in Islamic universities, one of which is the existence of various systems to support them with the existence of multiple kinds of systems to support decision making or Decision Support System. The system for determining outstanding lecturers is used to support learning and teaching activities on campus to create qualified and competent students in their fields. STAINU Purworejo is an Islamic university located in Central Java Province which has been established since 1974 and has 33 lecturers. The process of determining outstanding lecturers that is still running at STAINU Purworejo campus still has shortcomings, namely requiring a long time to process questionnaire data that has been distributed to the campus community and the decision results obtained are not fully valid and not objective. The determination of outstanding lecturers has five assessment criteria, namely: student assessment, superior assessment, educational qualifications, published journals, and lecturer administration. The method used is the Analytical Hierarchy Process (AHP) method to calculate the weight of each criterion and the Technique for Order by Similarity to Ideal Solution (TOPSIS) to rank alternatives based on each criterion. Based on calculations carried out using a combination of AHP and Topsis and system implementation, the highest preference value is 0.835 and the lowest preference value is 0.27. From the results of these calculations, it can be concluded that the utilization of digital transformation for lecturer performance with a Decision Support System that utilizes a combination of AHP and TOPSIS methods can be used to help provide recommendations in decision-making to determine the best lecturer at the Nahdlatul Ulama Islamic Religious College (STAINU) Purworejo.
Co-Authors ., Iriani Abd. Rasyid Syamsuri Abdul Ghofar Achmad Edi Subiyanto Achmad Munandar Achyani Ade Hari Siswanto Adi Rahmat Afandi, Yusuf Agus Indarjo Agus Sabdono Agus, Elsa Lusia Ahdiansyah, M Hafidz Aini, Firly Nur Alburhana, Lathifatusy Syifa Ali Djunaedi Almagribi, Ahmad Bilal Ambariyanto , Amin, Nashrul Anam, Aufa Anandita, Assifa Yusan Andriyani, Widyastuti Angga Dewi, Widya Novi Anggara, Muhammad Alyfansyah Rizky Anggraheny -, Anggraheny Anisa Nur Halimah Anna Fitri Hindriana Anna Triningsih Annisaul Khasanah Wulandari Khasanah Wulandari, Annisaul Khasanah Wulandari Khasanah Ari Widodo Ariesta Artamevia, Nazwa Aris Ismanto Ayu Puspitasari, Ayu Ayu Rosyida Zam Zam Azizah T.N., Ria Badik, Muhammad Bagus Eko Hardiono Baharudin, Muhammad Teguh Baidhowie, Lutfil Hakim Bambang Yulianto Banun Sri Haksasi Baskoro Rochaddi Bayong Tjasyono Bustomi Cahyono, Arie Eko Chrisna Adhi Suryono Delianis Pringgenies Desyandri Desyandri Devi Nandita Choesin, Devi Nandita Dewi Novitasari Diah Permata Wijayanti Dodon Turianto Nugrahadi Duduh Abdul Bara Dwi Jatmiko, Dwi Edi Wibowo Edi Wibowo Kushartono Edy Soesanto Edy Supriyadi Elfi Rimayati Endang Sri Susilo Endang Supriyantini Eny Inayati, Eny Erliyanti, Nove Kartika Fajar, Surya FIRDAUSI, Ifrohatul Dini Fitria Olivia franisa, anggi Fuad Ashari Fulgensius Surianto G. Sri Redjeki Gerhani, Febrina Gita, Irma Hadi Endrawati Hadi, Nur Halizah Haksan Darwangsa Handayani, Dwi Asih Kumala Handayani, Latifah Fitri Hapsara, Hudanu Hariadi Hariadi Harry Firman Hartadi, I Gede Haryono, Yoyo Haula Robbi, M. Kautsar Heryoso Setiyono Hutagaol, Inggrid Debora I Nyoman P Aryantha Ika Ayuningtyas Indarwati, YM Iqbal Maulana Iriawati Iriawati Irwani Irwani Irwanto, Eko Ismawati Ismawati Ita Riniatsih Jihadi, Muhammad Shulhan Jusup Suprijanto K. Susilo, David Käll, Sofia Khaerul Umam, Khaerul Khonsa Rezkania, Gita khusnul khotimah Krisiyanto, Krisiyanto Kunarso Kunarso Kusdarjanti, Endang Kusumadiani, Tazkia Aulia Lelono, Satrio Kusumo Lies Mardiyana, Lies Lilik Maslukah Lita Rosa, Mia Laksmi Luky Adrianto Luluk Elyana Maharani, Galung Dhiva Marini . Marselino, Frendy Mayunar Mimin Nurjhani K Mr Kusnadi Mrs Sariwulan Diana Muchamad Fajar Alamsyah Muh Yusuf Muhaimin, M. Hadid Muhajirin, Al Muhammad Reza Faisal, Muhammad Reza Muhammad Zainuri Mujayatun, Siti Musthofa, Danis Nurul Mustofa, Diah Ayu Mutiara Nurul Fajar Utami Mutiari Nurul Syam Utami Naufal, Nabil Neviyani Neviyani, Neviyani Ningrum, Marsella Ivon Citra Novi, Widya Nugroho Agus D Nugroho, Aditya Dwi Nur Khasanah Apriliasari, Nur Khasanah Nur Taurif Syamsudin Putra Jaya Nur, Sofyan Hasanuddin Nurasyah Dewi Napitupulu Nurohman, Muhamad Nuryani Rustaman Nusaputro, Kurnia Adi Oktarini, Rahmi Panatar, Jakfar Shodiq Philipus Uli Basa Hutabarat Pradana, Henrian Rizki Praressha Wizurai Prasetiyorini, Pudhak Prasetyo, Sigit Nian Pratama, Candrika Prayoga Nugraha Taunay Prihandoko, Tri Leksono Purba, Sariaman Purwati K. Suprapto Putri Novianingrum, Milka putri, Ferninda Rahardiyana Putri, Hawa Aritma Sunarko Raden Ario Raden Mohamad Herdian Bhakti Rahayu, Fenny Winda Rakhmawan, Aditya Ramadhani, Aulia Dessy Rasid, Harun Al Raudina, Anggit Sapta Retno Hartati Retno, Yosy Ria Azizah Tri Nuraini Ria, Intan Ade Riandi Riandi Ristanti, Rahmadita Aulya Rizkina, Nurnazmilaila rojanah, rojanah rojanah Rudhi Pribadi S Tapilouw, Fransisca. Sagara, Bangkit Putra sanjaya, deki dwi Satori, Djam'an Satriani, Bayu Satriya Pranata SD Sumbogo Murti Setiyadi, Agus Setyowati, Okti Sheila Puspa Arrum, Sheila Puspa Sianiwati Goenharto Sihite, Mombang Sintha Soraya Santi Siti Munawaroh Sri Mulyani Sri Redjeki Sri Sayekti Sri Turni Hartati Sri Wahjuni Sri Wulandari Sujati Sujayanty, Sri Sunarto, Sandy Ryan Hendrawanto Sunaryo Sunaryo Sunil Wahidah, Tiara Anggarani Syuaibatul Islamiyah Tania, Sara TATI NURHAYATI Taufan, Anas Taufiq-Spj, Nur Tony Hadibarata, Tony Tri Mulyati, Tri Trianna, Nurul Widji Ubay, Jufri Ucu Rahayu Wafi, Azmi Sabilakisbatul Wahyu, Rindika Widhorini, Widhorini Widi Purwianingsih Wilis Ari Setyati Wishnuputri, Parameswari Iccha Nirmalabuddhi Yagus Cahyadi Yenny Anwar Yogaswara, Rachmad Ramadhan Yudhatama, Bayu Khrisna Yuliana Yuliana Yunika Ayu Setya W Ayu Setya W. Yunita Yunita Yustin Ragil Dewanti Yusuf Hilmi Adisendjaja Zihni Ihkamuddin