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Gunawan, Akbar
Jurusan Teknik Industri Universitas Sultan Ageng Tirtayasa
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Green Synthesis of Silver Nanoparticles Using Caulerpa racemosa Extract as Bioreductor: Characterization and Antibacterial Activity Barleany, Dhena Ria; Selviroh, Selviroh; Saleh, Afiatta Ilhan; Pitaloka, Alia Badra; Gunawan, Akbar
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 2 (2025): Jurnal Rekayasa Kimia & Lingkungan (December, 2025) In Press
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i2.45873

Abstract

Silver nanoparticles (AgNPs) have attracted much attention due to their broad antimicrobial properties and have found many applications in various fields. In the current study, AgNPs were synthesized using an environmentally friendly method by utilizing Caulerpa racemosa extract as a bioreduction agent. This study aims to investigate the formation of AgNPs mediated by Caulerpa racemosa extract and to observe their antimicrobial capability. The concentration of silver nitrate (AgNO3) was varied to investigate its influence on the shape, size, and uniformity of the silver particles formed. The Fourier Transform Infra-red (FT-IR) test results revealed that Caulerpa racemosa extract has an (-OH) functional group that reduces Ag+ ions to Ag0, making it effective as a bioreductor for AgNPs synthesis. The shape and size of AgNPs were examined using Scanning Electron Microscope (SEM), and the results confirmed that increasing AgNO concentration from 5 to 20 mM produced larger and agglomerated particles. Additionally, AgNPs inhibitory effect on the growth of pathogenic Escherechia coli (gram-negative bacteria) was evaluated using the well diffusion method. The findings showed that AgNPs improved the antibacterial properties when incorporated into chitosan-based film solution. This indicates that AgNPs exhibit strong antibacterial activity against gram-negative bacteria and hold promises for use in bio-related applications, including food packaging and biomedical uses
Analisis Kepuasan Pelanggan Berdasarkan Dimensi Service Quality pada Toko Alfamidi Muara Ciujung Barat Gunawan, Akbar; Ferro Ferdinant, Putro; Pramesti, Dini; Barleany, Dhena Ria; Setiawan, Hadi; Katili, Putiri Bhuana
Journal of Integrated System Vol. 8 No. 2 (2025): Journal of Integrated System Vol. 8 No. 2 (December 2025)
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jis.v8i2.13482

Abstract

Kepuasan pelanggan merupakan faktor fundamental dalam dunia bisnis karena mutu pelayanan yang tidak optimal dapat secara langsung menurunkan tingkat kepuasan konsumen. Tujuan penelitian untuk menilai tingkat kepuasan pelanggan, mengidentifikasi aspek pelayanan yang menjadi kekuatan maupun kelemahan, menentukan prioritas perbaikan, serta menyusun strategi peningkatan mutu layanan di Toko Alfamidi Muara Ciujung Barat. Berdasarkan hasil karakteristik responden, diperoleh data bahwa 6,1% pelanggan merasa cukup puas, 34,4% puas, dan 59,6% sangat puas. Secara keseluruhan, tingkat kepuasan pelanggan termasuk dalam kategori “sangat puas” dengan nilai 84,02%. Analisis SERVQUAL memperlihatkan bahwa seluruh atribut menunjukkan nilai gap negatif, menandakan bahwa layanan yang diberikan belum sepenuhnya sesuai dengan ekspektasi pelanggan, meskipun tingkat kepuasan tergolong tinggi. Dimensi tangible merupakan keunggulan utama dengan nilai kualitas pelayanan 0,973, sementara dimensi empathy menjadi aspek terlemah dengan skor 0,941. Berdasarkan hasil Importance Performance Analysis (IPA), atribut-atribut dalam kuadran I—yang menjadi prioritas utama perbaikan—meliputi komunikasi antara karyawan dan pelanggan, pemahaman produk, kecepatan antrean kasir, kesesuaian harga antara label dan sistem kasir, serta kemampuan karyawan dalam menanggapi pelanggan dengan jelas. Rekomendasi peningkatan meliputi pelatihan SOP pelayanan, penataan produk yang lebih sistematis, peningkatan komunikasi, pemeriksaan harga secara rutin, serta penambahan kasir pada jam sibuk.
QUALITY MEASUREMENT CUSTOMER SATISFACTION INDEX (CSI) METHOD AND IMPORTANCE-PERFORMANCE ANALYSIS (IPA) DIAGRAM PT. ASDP INDONESIA FERRY (PERSERO) Merak – Banten Gunawan, Akbar; Iqbal, Iqbal
JEMIS (Journal of Engineering & Management in Industrial System) Vol. 6 No. 1 (2018)
Publisher : Industrial Engineering Department, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jemis.2018.006.01.2

Abstract

Service quality is a very important aspect to be considered to retain consumers. PT. ASDP INDONESIA FERRY (PERSERO) Merak Banten its duties as providers and services in the field of crossings. Measurement of customer satisfaction by using the method of the Customer Satisfaction Index (CSI) and Importance-Performance Analysis (IPA) diagram, Customer Satisfaction Index (CSI) value is 80,68%. which is the priority of improvement to improve customer satisfaction of PT ASDP INDONESIA that is in dimension of attributes intangible dimension is about toilet facility, this attribute need to be repaired because in its implementation there are still complaints from passengers and attributes that are contained in the dimensions responsiveness is regarding the speed and responsiveness in serving the passengers, responsiveness of the officer in providing information in providing the arrival and departure time , and the attributes contained in the assurance dimension is about the security level of the port area
Co-Authors Ade Irman Ade Irman Mutakin Ade Irman Saeful Mutaqin Ade Irman SM Ade Irman, Ade Alia Badra Pitaloka, Alia Badra Alifia Puspa Septianingrum Amelia Rachmawati Ananta, Surya Atmadilaga Ani Umyati Ani Umyati Arini Syafira Utami Asep Ridwan Asih Machfuzhoh Atia Sonda Bobby Kurniawan Budi Darma Maulana Cindy Christine Miranda Damasa G Desmiani Denni Kartika Sari Dewayana, Triwulandari Satitidjati Dhena R. Barleany Dhena Ria Barleany Dina Estining Tyas Lufianawati Dyah Lintang Trenggonowati Ekana Kusumaningrum Enny Fitriyanti Erien Amelia Erlin Filiandini Evi Febianti Evi Febianti Fajri Humaedi Fani Rahma Damayanti Fellek Getu Tadesse Ferro Ferdinant, Putro Galih, Restu Azi Hadi Setiawan Hadi Setiawan Hadi Setiawank Hafair Mubarak Ibrahim Nur Farabi Intan Nauroh Iqbal Iqbal Iqbal Iqbal Iveline Anne Marie Kadarsah Suryadi Kee Evelyne Khairiyyah Rusydi khatili, putiri buana kulsum kulsum Kulsum M.T. M.Naufal Muadz Mentari Indria Cahya Merdiana Dewantari, Nustin Muhamad Ridwan Muharni, Yusraini Mukti Lestari Mutakin, ade irman Nuraida Wahyuni Nurul Ummi Nustin Merdiana Dewantari Pramesti, Dini Purbasari, Intan Puti Nur Hardiyanti Putiri B. Katili Putiri Bhuana Katili Putiri Bhuana Katili Putiri Buana Khatili Putro Ferro Ferdinant Putro Ferro Ferdinant Ratna Ekawati Restu Wigati, Restu Retno Sulistyo Dhamar Lestari Rettrikar Kiswindyatmoko Ria Barleany, Dhena Rifan Maulana Rizki Akbari Robi Setiawan Saeful Mutaqin S., Ade Irman Saleh, Afiatta Ilhan Selviroh, Selviroh Shera Dwi Andini Sirajuddin Sirajuddin Syahputra, Galang ulfah, Maria Ummi, Nurul Utami Damayanti Vidya Nursekha Wahyu Susihono Yanuar Sutanto Zainal Abidin