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Machrus Ali
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Nucleus Journal
Published by Universitas Darul Ulum
ISSN : 29644097     EISSN : 29644100     DOI : https://doi.org/10.32492/nucleus.v4i1
Core Subject : Education, Engineering,
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Education Electrical & Electronics Engineering Industrial & Manufacturing Engineering
Nucleus Journal: Jurnal Sains dan Teknologi is a peer-reviewed journal published by Universitas Darul Ulum. Nucleus Journal is published twice a year, in May and November. Nucleus Journal is a publication of research results of Students, Lecturers and Practitioners in the field of Science and Technology. Fields of study include; Electrical Engineering, Industrial Engineering, Informatics Engineering, Civil Engineering, Chemical Engineering, Agricultural Sciences, Architecture, Engineering Education, And Other Engineering Fields. e-ISSN: 2964-4100 p-ISSN: 2964-4097
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 6 Documents
 1 
Search results for , issue "Vol. 4 No. 1 (2025): May" : 6 Documents clear
Analisis Kualitas Air Minum Isi Ulang Di Beberapa Depot Air Minum Di Kecamatan Merjosari Dewi Laras Anggraeni, Megah; Tri Karuniawati, Ardiani; Mulyono, Agus
Nucleus Journal Vol. 4 No. 1 (2025): May
Publisher : Universitas Darul Ulum

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32492/nucleus.v4i1.4101

Abstract

Penelitian ini menguji kualitas air minum isi ulang di beberapa depot air minum di kecamatan merjosari dengan memeriksa beberapa parameter fisikokimia, termasuk TDS (Total Dissolved Solids), pH, suhu, warna. Hasil uji menunjukkan bahwa beberapa parameter, seperti logam berat (Pb dan As), tidak terdeteksi, yang mengindikasikan bahwa air tersebut bebas dari kontaminasi berbahaya. Nilai TDS yang rendah menandakan sedikitnya zat terlarut dalam air, sementara pH air berada dalam kisaran normal, menunjukkan bahwa air tersebut tidak asam atau basa ekstrem. Suhu air juga terukur dalam rentang yang aman, tidak mempengaruhi kelarutan atau reaktivitas zat kimia dalam air. Warna air yang jernih menandakan tidak adanya partikel terlarut yang mencemari. Secara keseluruhan, hasil penelitian ini menunjukkan bahwa kualitas air dalam sampel yang diuji memenuhi standar yang aman untuk digunakan, dengan bebas dari kontaminasi logam berat dan mikroorganisme berbahaya.
Pengaruh Kecepatan Screw dan Feeder pada Mesin Extruder terhadap Karakteristik Hasil Bijih Plastik Muhammad Erwin Cahyo Nugroho; Tutuka, Rachmadi; Ahmad Zulkipli, Rohiman
Nucleus Journal Vol. 4 No. 1 (2025): May
Publisher : Universitas Darul Ulum

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32492/nucleus.v4i1.4102

Abstract

The problem of plastic waste, especially from PET bottles, continues to increase and prompts the need for innovation in processing waste into high-value products. One method used is the extrusion process, which can produce plastic ore from recycled plastic waste. This study aims to examine the effect of variations in screw speed and feeder speed in extruder machines on the characteristics of plastic ore yield. The material used was used PET plastic bottle flakes, while the cutting speed was kept constant throughout the process. Evaluation was conducted based on the ratio between screw and feeder speed to see the impact on the homogeneity, size, and shape stability of the plastic ore produced. The data combination with the range at screw speed (Ns) = 25 rpm; feeder speed (Nf) = 10 rpm appeared repeatedly and showed stable performance based on the observation test. This combination is most likely the optimal operating parameter. At a stable screw/feeder ratio of 2:1 to 2.5:1, the ore yield is more uniform and dimensional consistency is higher. The calculation results show that the ideal cutting speed is 132 rpm. The current extruder machine tool design set at only 140 rpm constant speed is too fast for this condition. Screw speed and feed rate affect the mass flow rate and melting temperature of the material. The cutting speed must be matched with the material output rate from the extruder to produce a consistent size of plastic ore. The results show that a balanced speed ratio provides a uniform size distribution and a more stable ore shape, while speed imbalance can give rise to product defects such as bubbles, rough surface, and non-uniform shape. The results of this research discussion show the importance of proper process parameter settings in extrusion systems to produce high-quality plastic ore from recycled materials.
Rekomendasi Implementasi Layanan Mobile 5G Untuk Institusi Pendidikan Menggunakan Cost Benefit Analysis (CBA) Panjaitan, May Hendra Panjaitan
Nucleus Journal Vol. 4 No. 1 (2025): May
Publisher : Universitas Darul Ulum

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32492/nucleus.v4i1.4103

Abstract

Salah satu kendala utama dalam implementasi jaringan 5G adalah biaya yang tinggi. Infrastruktur yang diperlukan untuk mendukung jaringan 5G jauh lebih kompleks dan mahal dibandingkan dengan 4G. Misalnya, untuk membangun satu menara 5G, penyedia layanan harus mengeluarkan biaya yang signifikan untuk perangkat keras dan perangkat lunak yang diperlukan, serta untuk lisensi frekuensi. Hal ini menjadi tantangan tersendiri bagi operator seluler, terutama di negara berkembang seperti Indonesia, di mana anggaran untuk pengembangan infrastruktur sering kali terbatas. Dalam konteks ini, penting untuk mempertimbangkan bagaimana biaya tersebut dapat diimbangi dengan manfaat yang diperoleh dari penerapan teknologi ini.Layanan 5G adalah layanan seluler yang mulai banyak diimplementasikan di Indonesia. Berdasarkan Kementerian Kominfo, penetrasi 5G di Indonesia sebesar 2,9 % pada 2023. Salah satu kendala dari implementasi jaringan 5G adalah besarnya biaya yang dibutuhkan dibandingkan teknologi 4G dan kecendrungan masyarakat Indonesia yang memakai layanan broadband hanya untuk keperluan hiburan dan mencari berita. Institusi pendidikan berpotensi menjadi sumber pendapatan lain dalam penggunaan jaringan 5G. Berdasarkan metode cost and benefit analysis, implementasi jaringan 5G di Politeknik Industri Petrokimia Banten layak dilakukan. Hal ini tercermin dari nilai Net Present Value (NPV) sebesar $727.028,2.
Implementasi Material Requirement Planning (MRP) untuk Pengelolaan Laboratorium Politeknik Industri Petrokimia Banten Alfarizi, Tito; Aulya Fitri, Triani
Nucleus Journal Vol. 4 No. 1 (2025): May
Publisher : Universitas Darul Ulum

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32492/nucleus.v4i1.4104

Abstract

The availability of materials and equipment plays a crucial role in ensuring the continuity and smoothness of the learning process, especially in practical activities. However, in its implementation, there are still obstacles in the form of the unavailability of systematic instruments to support the decision-making process in purchasing practical materials. As a result, there is often a shortage or out-of-stock of practical materials during the activity, which ultimately hinders the learning process. To overcome this problem, this study applies the Material Requirement Planning (MRP) method as a tool in the process of planning practical material needs. MRP is used to analyze material needs based on the practical activity schedule and the availability of existing stock, so that it can be known more accurately when the right time is to reorder. By implementing the Material Requirement Planning (MRP) method, the decision-making process becomes more structured and efficient. This allows laboratory managers or responsible parties to order practical materials in a timely manner, so that supplies are maintained and practical activities can take place without obstacles
Bioplastik Berbasis Pati Sagu dengan Penambahan Filler Microfibrillated Cellulose dan Refuse-Derived Fuel Betariani, Khairunisa; Rahayu, Puji; Jaman, Winda Sri; Wirandi, Mohammad
Nucleus Journal Vol. 4 No. 1 (2025): May
Publisher : Universitas Darul Ulum

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32492/nucleus.v4i1.4105

Abstract

This study aims to develop starch-based bioplastics using sago starch with the addition of Microfibrillated Cellulose (MFC) and Refuse-Derived Fuel (RDF) fillers to enhance mechanical properties and material sustainability. Sago starch was selected as the base material due to its biodegradability, while MFC derived from empty palm oil fruit bunches served as a structural reinforcement, and RDF was introduced as an additional filler sourced from processed organic and inorganic waste. The bioplastic production process involved starch gelatinization, mixing with MFC and RDF solutions, addition of sorbitol as a plasticizer, casting, and natural drying. Characterization included morphological analysis and mechanical testing. Results showed that the sago starch+MFC bioplastic exhibited a more homogeneous surface morphology and superior mechanical properties, with a maximum tensile strength of 10.6 MPa and elongation at break of 5.7%. The addition of RDF increased material density but reduced homogeneity and toughness, with fracture energy per volume drastically decreasing from 488.28 kJ/m³ to 41.15 kJ/m³. Overall, the combination of sago starch and MFC offered better mechanical performance, while RDF addition requires optimization to maintain structural integrity. This innovation supports waste utilization and promotes circular economy principles in the development of environmentally friendly materials.
Evaluasi Performa Furnace EDC (Ethyl Dichloride) Cracker di VCM (Vinyl Chloride Monomer)-1 Plant Ahmad Zulkipli, Rohiman; Rachmadi, Rachmadi; Muhammad , Yafi Fadhlurohman
Nucleus Journal Vol. 4 No. 1 (2025): May
Publisher : Universitas Darul Ulum

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32492/nucleus.v4i1.4106

Abstract

Furnaces in the production of VCM (Vinyl Chloride Monomer) must be operated with optimal efficiency to maximize production and minimize the formation of impurities (coke). Furnace efficiency is evaluated based on the ratio of heat generated from fuel combustion to heat absorbed by the EDC (Ethyl Dichloride) fluid, and is a key indicator of operational feasibility. In addition, the pressure difference of the inlet convection and outlet radiant sections is used as an additional parameter, where an increase in this value reflects the accumulation of deposits in the tubes. If the efficiency drops below the minimum operating conditions or the pressure difference between the convection inlet and outlet radiant section exceeds 4 kg/cm2G, the furnace is considered unfit for operation and decoking must be performed, which will increase operating costs. During the 12 days of monitoring (measurement every 8 hours), the average efficiency was 85.370%, the highest value was 87.348%, and the lowest value was 83.764%. The efficiency values tended to fluctuate and were below the minimum operating condition (88.898%). This is due to changes in operating conditions and manual control. Therefore, although the pressure difference is still below the threshold of 4 kg/cm2G, the furnace is considered unfit for operation.

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