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All Journal JURNAL INTEGRASI Journal of Applied Electrical Engineering Humantech : Jurnal Ilmiah Multidisiplin Indonesia Pharmaceutical Sciences and Research (PSR) Jurnal Pendidikan Teknik Mesin
Nadhrah Wivanius, Nadhrah
Chemistry Universitas Indonesia
Religion Automotive Engineering Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Law, Crime, Criminology & Criminal Justice Mechanical Engineering Public Health Other

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Sintesis dan Karakterisasi Hidrogel Superabsorben Kitosan Poli(N-Vinilkaprolaktam) (Pnvcl) Dengan Metode Full Ipn (Interpenetrating Polymer Network) Wivanius, Nadhrah; Budianto, Emil
Pharmaceutical Sciences and Research Vol. 2, No. 3
Publisher : UI Scholars Hub

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

Abstract

Polymer material used for hydrogel should have capability to swell and to keep water molecules in its structure without solubilised in water. Natural polymers has functional groups which can perform as active sites in modification to produce polymer with better characteristic. Chitosan is a natural polymer which has good swelling ability but lack of structural strength. Synthesis of chitosan hydrogel by interpenetrating polymer network (IPN) will increase its strength through crosslinking. In this research, the first step of modification was the synthesis of chitosan polymer network crosslinked by acetaldehyde. The next step was the synthesis of PNVCL polymer network crosslinked by N,N-methylbisacrylamide (MBA) through free radical polymerization of NVCL monomer with ammonium persulfat (APS) as the initiatior. Optimum reaction time, chitosan/PNVCL ratio (w/w %), concentration of crosslinker agent, and concentration of initiator had been observed. The optimum conditions were obtained as followed: 2 hours reaction, the ratio chitosan/PNVCL of 90:10 (w/w %), %-w MBA concentration of 0,5%, and APS concentration of 3%. The swelling ratio of the hydrogel was 380,66% while the crosslinking degree was 60,85%. Fourier transfor infrared spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), Thermogravimetric analysis (TGA), Scanning Electron Microscope (SEM), and X-Ray diffraction (XRD) were used for the characterization of the hydrogel.
STUDI KERUSAKAN MESIN WHEEL LOADER LIUGONG ZL50CN MENGGUNAKAN FMEA DAN DIAGRAM FISHBONE Kamsyah, Domi; Ramadhani , Hasan Fajriansyah; Leksonowati, Nur Fitria Pujo; Wivanius, Nadhrah
Jurnal Pendidikan Teknik Mesin Vol. 12 No. 1 (2025): Jurnal Pendidikan Teknik Mesin
Publisher : Program Studi Pendidikan Teknik Mesin Fakultas Keguruan dan Ilmu Pendidikan Universitas Sriwiajaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jptm.v12i1.77

Abstract

Power system merupakan sistem yang memberikan tenaga agar wheel loader dapat beroperasi dan merupakan sumber penggerak utama bagi sistem atau komponen lainnya. Kegagalan fungsi pada power system mengganggu kerja sistem lain yang dapat berdampak kepada penurunan produktivitas, downtime, dan biaya perbaikan yang tinggi. Penelitian ini dilakukan untuk mencari tahu penyebab kegagalan power system dari wheel loader Liugong ZL50CN, dengan cara mengidentifikasi kemungkinan kegagalan dengan menggunakan metode FMEA dan dilanjutkan menggunakan diagram fishbone untuk melihat penyebab kegagalan. Hasil analis menunjukkan bahwa penyebab utama penyebab kerusakan pada mesin wheel loader ZL50CN dalam kurun waktu Januari 2021 sampai Desember 2023 adalah kerusakan sistem pendingin mesin. Hasil FMEA membuktikan bahwa modus kegagalan kerusakan sistem pendingin mesin memiliki nilai RPN tertinggi yaitu sebesar 243. Digram fishbone merinci penyebab apa saja yang membuat modus kegagalan kerusakan sistem pendingin mesin yang terdiri dari 4 faktor utama yaitu mechine, material, man, dan metode. Kata kunci: FMEA, Digram fishbone, RPN
Optimization of IC 32-pin QFP Pick Up Parameters Wikanta, Prasaja; Sitompul, Adravia Lisbeth Claudia; Wivanius, Nadhrah; Arifin, Muhammad; Nakul, Fitriyanti
Humantech : Jurnal Ilmiah Multidisiplin Indonesia Vol. 4 No. 4 (2025): Humantech : Jurnal Ilmiah Multidisiplin Indonesia
Publisher : Program Studi Akuntansi IKOPIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32670/ht.v4i4.5466

Abstract

This study aims to optimize the picking parameters of 32-pin Quad Flat Package (QFP) IC components on the SM421 pick-and-place machine operating at the Teaching Factory for Electronics Manufac-turing (TFME) of Batam State Polytechnic. Currently, the machine has not been optimized, so users must manually adjust the compo-nent dimensions and parameter settings before operation. This re-sults in significant setup time and reduces process efficiency. The method used in this study is Design of Experiments (DOE) to sys-tematically evaluate various parameter settings. The experimental results show that certain configurations can reduce setup time and improve component placement accuracy. These findings contribute significantly to improving machine performance and operational ef-ficiency in the Surface Mount Technology (SMT) assembly process. In conclusion, optimizing the 32-pin IC picking parameters on the SM421 machine can improve the productivity and effectiveness of the assembly process.
Pengukuran Kemampuan Manufaktur PCB Empat Layer di TFME Octowinandi, Vivin; Risandriya, Sumantri K.; Asaad, Nur Sakinah; Diputra, Muhammad Naufal Airlangga; Ria, Riki; Pratama, Adjie Sukma; Wivanius, Nadhrah
Journal of Applied Electrical Engineering Vol. 8 No. 1 (2024): JAEE, June 2024
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jaee.v8i1.6991

Abstract

Saat ini PCB multi-layer banyak digunakan pada rangkaian elektronik karena mampu menyediakan PCB dengan kepadatan komponen yang lebih tinggi, kecepatan tinggi dan ukuran PCB yang relatif lebih kecil dibandingkan dengan PCB single layer. Untuk menjawab kebutuhan pasar, TFME (Teaching Factory Manucacturing of Electronics) yang merupakan salah satu laboratorium di lembaga Politeknik Batam, dirasa perlu melakukan penelitian untuk mengukur kemampuan produksi di bidang manufaktur PCB multi-layer, khususnya empat layer. Total PCB empat layer yang dibuat adalah sejumlah sembilan belas unit. Adapun metoda yang digunakan untuk mengukur kemampuan TFME dalam membuat PCB empat layer adalah dengan cara mengukur kesesuaian koneksi jalur tembaga terhadap desain dan pengecekan visual kesejajaran antar layer menggunakan mesin x-ray. Dari hasil pengujian dapat diketahui bahwa untuk PCB yang menggunakan via ukuran 0.7mm tidak memiliki cacat jalur putus.
Comparative Analysis between SA-516 Gr 70 Material with SA-537 Class 2 Material in Shell Pressure Vessel Fabrication Process Puspita, Widya Rika; Putri, Sarah Athaullah Wenna; Jefiza, Adlian; Arifin, Muhammad; Maulidah, Hana Mutialif; Nakul, Fitriyanti; Suciningtyas, Ika Karlina Laila Nur; Putra, Irwanto Zarma; Budiana, Budiana; Futra, Asrizal Deri; Wivanius, Nadhrah
JURNAL INTEGRASI Vol. 16 No. 2 (2024): Jurnal Integrasi - Oktober 2024
Publisher : Pusat Penelitian dan Pengabdian Masyarakat Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/ji.v16i2.8563

Abstract

A pressure vessel is a container designed to hold fluids under pressure, including liquids and gases with varying pressures and temperatures. The pressure exerted on the vessel's walls and body is a critical factor that must be carefully considered to ensure compliance with applicable international design standards and prioritize worker safety and security. This research focused on a pressure vessel to investigate the impact of temperature on shell thickness to meet ASME standards. The study utilized shell components made from SA-516 Gr 70 and SA-537 materials. Experiments were conducted with each material at temperatures of 250°C, 235°C, and 343°C, revealing that thickness varies based on material and temperature. The research findings demonstrate compliance with ASME standards, as the shell thickness in all trials exceeded the minimum specified in the drawings.
Co-Authors Asaad, Nur Sakinah BUDIANA, BUDIANA Diputra, Muhammad Naufal Airlangga Emil Budianto Futra, Asrizal Deri Ika Karlina Laila Nur Suciningtyas Jefiza, Adlian Kamsyah, Domi Leksonowati, Nur Fitria Pujo Maulidah, Hana Mutialif Muhammad Arifin Nakul, Fitriyanti Octowinandi, Vivin Pratama, Adjie Sukma Puspita, Widya Rika Putra, Irwanto Zarma Putri, Sarah Athaullah Wenna Ramadhani , Hasan Fajriansyah Ria, Riki Risandriya, Sumantri K. Sitompul, Adravia Lisbeth Claudia Wikanta, Prasaja