cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Paska Marto Hasugian
Contact Email
majelis@paspama.org
Phone
+6281264451404
Journal Mail Official
majelis@paspama.org
Editorial Address
Jl Piano N0 156 Selambo, Deliserdang, Sumatera Utara, Indonesia, Sumatera Utara, Indonesia , Kab. Deli Serdang, Provinsi Sumatera Utara, 20229
Location
Unknown,
Unknown
INDONESIA
Journal Majelis Paspama
Published by Paspama Institute
ISSN : -     EISSN : 29871379     DOI : https://doi.org/10.58471
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Journal Majelis Paspama The following journals that receive a multidisciplinary research focus with a Scope of Engineering accept submissions of scientific articles for research in the form of research results, surveys, and literature in the fields of engineering, including: Informatics Engineering, Electrical engineering, Civil engineering, Architecture, Chemical engineering, Industrial engineering, Mechanical engineerin
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 46 Documents
 1   2   3   4   5 
Sustainable Profitability Analysis of Natural Gas-Based Methanol Production Onuoha Fidelis Wopara; Nnadikwe Johnson
Journal Majelis Paspama Vol. 4 No. 02 (2026): Journal Majelis Paspama, 2026, inpres
Publisher : Journal Majelis Paspama

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

Abstract

Methanol production from natural gas is gaining traction as a sustainable alternative to conventional fuels. This paper presents an economic analysis and design of large-scale methanol production, optimizing synthesis gas composition (CO/CO₂ ratio) for enhanced yield. A Maximum Energy Recovery (MER) heat exchanger network reduces operational costs, achieving a break-even point of 2.69 years. Key results include: production capacity meeting ~1% of global demand, total operating cost optimized at 4× raw materials cost, and a fixed-tube sheet heat exchanger (22.54 m²) selected for low-temperature heat exchange. Sensitivity analyses demonstrate robustness against natural gas price fluctuations and methanol market trends, underscoring the process's economic viability and environmental sustainability.
Efficient Propane-Ethane Fractionation within Petrochemical Plant Operations Nnadikwe Johnson; Onuoha Fidelis Wopara
Journal Majelis Paspama Vol. 4 No. 02 (2026): Journal Majelis Paspama, 2026, inpres
Publisher : Journal Majelis Paspama

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

Abstract

Efficient propane-ethane fractionation is crucial in petrochemical complexes, enabling the production of high-purity products. This paper focuses on the treatment of ethane-propane mixtures recovered from natural gas, highlighting the interplay between key units: Gas Sweetening Unit (GSU), C2/C3 Recovery Unit, and Gas Cracker Unit (GCU). In the GSU, acid gases like CO2 are removed via chemical absorption using solvents like DEA, preventing freezing issues in downstream cryogenic processes. The 'sweetened' gas feeds into the C2/C3 Recovery Unit, where cryogenic conditions enable efficient ethane-propane separation. Optimizing fractionation in this unit enhances GCU performance, boosting ethylene and propylene yields. Process integration and energy efficiency are critical considerations. This study explores efficient propane-ethane fractionation strategies, aiming to improve overall petrochemical complex performance. Key aspects of this process include effective CO2 removal in the GSU, ensuring process reliability. Cryogenic separation in the C2/C3 Recovery Unit enables high-purity product recovery. The impact on GCU performance is significant, as efficient fractionation boosts downstream yields. Energy-efficient fractionation strategies are also crucial for reducing operating costs and environmental impact. By optimizing these aspects, petrochemical complexes can improve product yields, reduce energy consumption, and enhance overall efficiency. This research contributes to the development of efficient propane-ethane fractionation technologies, supporting the growth of the petrochemical industry.
Design and Construction of a Biogas Digester for Producing Methane from Cow Dung Nnadikwe Johnson; Khama Rieborue Emmanue; IKputu Woyengikuro Hilary; Amaefule Chibunma Vivian
Journal Majelis Paspama Vol. 4 No. 02 (2026): Journal Majelis Paspama, 2026, inpres
Publisher : Journal Majelis Paspama

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

Abstract

The increasing demand for renewable energy and the need for sustainable waste management necessitated this study on the design and construction of a biogas digester for producing methane from cow dung. The objectives were to design a mini floating-drum biogas digester, construct and operate the system using cow dung as substrate, evaluate its performance based on biogas volume and methane content, and assess the digested slurry as organic fertilizer. The digester was constructed using locally available materials and consisted of a digestion chamber, inlet and outlet pipes, a water-jacket seal, and an inverted floating drum as gas holder. The system was charged with cow dung slurry mixed at a 1:1 ratio with water and operated under ambient conditions for a retention period of 30 days. Results showed that biogas production commenced on day 3 and reached a peak between day 14 and day 18. A total cumulative biogas yield of 1.26 m³ was recorded, with an average daily production of 0.042 m³. Gas analysis revealed a methane content of 61.4%, carbon dioxide 34.8%, and trace amounts of hydrogen sulfide, hydrogen, nitrogen, oxygen, and water vapor. The methane content was sufficient for combustion, confirming the biogas as methane-rich. The digested slurry obtained was odorless and suitable for use as organic fertilizer. The study concluded that the floating-drum biogas digester is effective for converting cow dung to methane and organic fertilizer under local conditions. The design is simple, cost-effective, and can be adopted by small-scale farms and households for waste management and renewable energy generation. It is recommended that further work focus on gas purification and scale-up for community use.
Implementation of the Phase Coding Steganography Method for Embedding Secret Messages in Audio Media Daniel S. Simbolon; Daniel Adrian Sirait; Stephen Gilbert R. Gulo
Journal Majelis Paspama Vol. 2 No. 2 (2024): Journal Majelis Paspama, July 2024
Publisher : Journal Majelis Paspama

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

Abstract

The development of information technology has driven an increasing need for data security, particularly in the transmission of secret messages through digital media. One technique that can be used to maintain information confidentiality is steganography, which is the method of hiding messages within other media without causing noticeable changes. This study aims to implement the Phase Coding steganography method for embedding secret messages into digital audio media, so that the message is not easily detected by unauthorized parties. The Phase Coding method works by modifying the phase of the audio signal without significantly altering its amplitude, thereby maintaining audio quality and making it difficult to distinguish from the original audio by human hearing. In this study, the process includes preparing the audio file as a cover, converting the secret message into binary form, embedding the message using the Phase Coding technique, and extracting the hidden message. The implementation is carried out using a programming language to test the success of both embedding and retrieving the message. The results show that the Phase Coding method is capable of embedding secret messages into audio media with good performance without significantly degrading audio quality. The secret message can also be accurately extracted and recovered in its original form. Therefore, the Phase Coding steganography method can be considered an effective solution for securing information in audio-based media.
Studies on the Compressive Behaviour of Aluminum–Zircon composites Oluwaseyi Omotayo Taiwo; Abraham Kehinde Aworinde; Kenechukwu ThankGod Onyena; Darlington Chinaza Amadi; Binah Somtochukwu Ojiyi
Journal Majelis Paspama Vol. 4 No. 02 (2026): Journal Majelis Paspama, 2026, inpres
Publisher : Journal Majelis Paspama

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

Abstract

The use of Zircon (ZrSiO4) as reinforcement for aluminum (Al) alloys is generating interest due to its attractive properties. This has therefore made zircon a promising reinforcement for Al composites in automobile, aerospace, packaging and structural applications. While investigations on the mechanical responses of aluminum reinforced with zircon composites (especially hybrid composites) developed via stir casting has been extensively considered, limited works have been done on the compressive behaviour of single reinforced zircon composites. Hence, this work evaluates the compressive strength, compressive modulus, hardness, density, and impact strength of Al–ZrSiO4 composites produced by stir casting process. Compressive strength, hardness density increased with increasing zircon reinforcement while the compressive modulus and impact energy greatly reduced. Microstructural analysis confirms the presence and distribution of zircon particles. 
Microbiological Contamination and Hydrocarbon Pollution of Surface Water and Sediments in the Okulu River, Rivers State, Nigeria Ifiora, Chukwudozie Colman; G. N. Woke; Felicity Uju Onwudinjo; Chimezie Ekeke; T. M. Iringe-Koko; Paul Aforji Osaro
Journal Majelis Paspama Vol. 4 No. 02 (2026): Journal Majelis Paspama, 2026, inpres
Publisher : Journal Majelis Paspama

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

Abstract

Surface water bodies in industrialized regions are increasingly threatened by microbiological contamination and hydrocarbon pollution, raising serious concerns for environmental sustainability and public health The study employed a field-based analytical design to evaluate microbiological and physicochemical contamination of surface water and sediments in the Okulu River. Five sampling stations were established, comprising four industrially impacted sites and one control site. Surface water and sediment samples were systematically collected, preserved, and analyzed for total coliforms, Escherichia coli, petroleum aromatic hydrocarbons, and potassium using standard laboratory techniques. Results were statistically analyzed and compared with World Health Organization standards to assess contamination levels, spatial variation, and associated environmental and public health risks. Results revealed marked spatial variation and widespread contamination of the Okulu River. Total coliforms in surface water exceeded WHO limits at all stations, peaking at SW4 (712 cfu/100 ml) compared to the control (0.01 cfu/100 ml). Sediments showed even higher coliform loads, with SD4 recording 7,765 cfu/100 ml. E. coli counts followed similar trends in surface water (SW4: 84.2 cfu/100 ml) and sediments (SD4: 903.5 cfu/100 ml), indicating fecal pollution. PAH concentrations were extremely elevated in surface water (SW4: 1,723 ppm) and sediments (SD4: 2,606 ppm), far above WHO limits. Potassium exceeded guidelines in impacted sites for water (up to 17.02 mg/L) and sediments (up to 84.08 mg/L). In conclusion, the Okulu River is severely degraded by combined microbiological and hydrocarbon pollution, posing significant ecological and public health risks and necessitating urgent regulatory enforcement, continuous monitoring, and remediation interventions.

Page 5 of 5 | Total Record : 46

 1   2   3   4   5 

Filter by Year

2023 2026


Reset
Filter By Issues
All Issue Vol. 4 No. 02 (2026): Journal Majelis Paspama, 2026, inpres Vol. 4 No. 01 (2026): Journal Majelis Paspama, 2026 Vol. 3 No. 02 (2025): Journal Majelis Paspama, 2025 Vol. 3 No. 01 (2025): Journal Majelis Paspama, January 2025 Vol. 2 No. 01 (2024): Journal Majelis Paspama, January 2024 Vol. 2 No. 2 (2024): Journal Majelis Paspama, July 2024 Vol. 1 No. 02 (2023): Journal Majelis Paspama, July 2023