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ERWAN ADI SAPUTRO
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International Journal of Eco-Innovation in Science and Engineering (IJEISE)
Published by Universitas Pembangunan Nasional Veteran Jawa Timur
ISSN : -     EISSN : 27218775     DOI : https://doi.org/10.33005/ijeise
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering Industrial & Manufacturing Engineering Mechanical Engineering
International Journal of Eco-Innovation in Science and Engineering (IJEISE) covers all topics of Eco-Innovation in Science and technology related research from Chemical Engineering, Environment Engineering, Civil engineering, Industrial Engineering, Food Technology, Agrotechnology and others science and engineering field. IJEISE publish 2x a year (May and November).
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 87 Documents
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Analysis of The Queue System in Self-Service Using The "ABC Supermarket" Queue Method Islami, Mega Cattleya P.A; Winursito, Yekti Condro; Saputro, Erwan Adi; Noviani, Siti Alya
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 5 No. 1 (2024): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v5i1.126

Abstract

A queuing system is a mathematical model used to analyze the phenomenon where entities wait to receive services from one or more service providers. In this system, arriving entities will queue if the service is not immediately available and will be served according to a specific order or priority when the service becomes available. ABC Supermarket is a store that is always busy with customers. Besides having low prices, ABC Supermarket also provides daily necessities. The purpose of this research is to determine whether the cashier queue system implemented at ABC Supermarket is effective or not. This research uses the queue system method. This research concludes that the queue system at ABC Supermarket with 6 cashiers has an average ρ value percentage of 41.67%, which falls into the ineffective category. The most effective number of cashiers is 3, with an average r value percentage of 83.33%, which falls into the effective category. The purpose of queuing system analysis is to optimize the performance of the queuing process by determining the optimal number of service providers required.
Analysis of Sulfur Dioxide (SO2) Exhaust Gas Emission Distribution Patterns from Airport’s Incinerators in East Java Adhi Pamungkas, Kresna Setyawan; Restu Hikmah Ayu Murti; Muhammad Abdus Salam Jawwad
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 5 No. 1 (2024): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v5i1.127

Abstract

The airport in this study is one of the airports in East Java that uses an incinerator to process its waste. Emissions generated by the incinerator will disperse in the area surrounding one of the airports in East Java. With the increasing interest of the public in air travel, activity at the airport also increases. This increase also impacts the amount of waste processed by the incinerator and the emissions produced, including Sulfur Dioxide (SO2). The aim of this study is to analyze the dispersion of air pollutants using Aermod View modeling software with SO2 parameters from environmental document data of the airport from January to June and from July to December generated by the incinerator stack. The model produces isopleths representing the dispersion of SO2 emissions. The results of the SO2 model still meet ambient air quality standards, as indicated in Appendix VII of Government Regulation Number 22 of 2021.
METABOLOMIC TECHNIQUE IN GREEN TEA RESEARCH: A REVIEW Kurnianto, Muhammad Alfid; Rini, Dina Mustika
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 5 No. 1 (2024): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v5i1.128

Abstract

Tea, consumed by two-thirds of the global population, had a production of 5.68 million tons in 2017. The cultivation and processing of tea are crucial variables that have a substantial impact on the final product. As a result, many types of tea, such as black, oolong, and green, are produced, each with its own unique flavors and health advantages. Metabolomic techniques, which employ advanced analytical methods, are employed to characterize chemical composition of tea, thereby enabling the assessment of its quality, origin, and bioactivity. This review focused on the application of these techniques to the green tea research. Analytical methods such as UPLC-MS and 1H NMR, when employed in conjunction with multivariate analysis, have proven effective in correlating green tea quality with its chemical constituents, identifying key metabolites such as EGCG, ECG, and caffeine. These metabolomic techniques permit rapid and accurate assessments, enabling the differentiation between high- and low-quality green tea and enhancing the comprehension of its chemical composition and sensory attributes. In addition, a metabolomic approach was employed, utilizing HPLC-TOF-MS, to differentiate between various types of green tea based on their bioactivities. These methods have the capacity to reveal significant variations in metabolite profiles and bioactivities. The application of multivariate analysis enabled the identification of specific bioactive cultivars, thereby demonstrating the efficacy of the technique in evaluating the health-promoting effects of different tea samples. Thus, metabolomic methods represent an optimal approach for a comprehensive and expeditious investigation of the research related to green tea.
The Effect of Total Quality Management on Service Quality, Price, and Customer Satisfaction at Kita-Kita Tour and Travel Nugraha, Isna; Ramadhan, Gilang
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 5 No. 2 (2024): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v5i2.130

Abstract

This study aims to analyze the effect of Total Quality Management (TQM) implementation on service quality and price and its impact on customer satisfaction at Kita-Kita Tour and Travel. This study uses a quantitative method with a casual associative approach to measure service quality variables (X1), price (X2), and customer satisfaction (Y). Data was collected through questionnaires distributed to consumers who have used Kita-Kita Tour and Travel services, and was analyzed using SPSS software. Data that meets the validity, reliability, and classical assumption tests are then processed to produce a linear regression equation. The results of the analysis show that service quality and price partially and simultaneously have a positive and significant effect on customer satisfaction, so the hypothesis is accepted. The reliability test resulted in a Cronbach's Alpha value of 0.864, indicating that the data obtained is reliable. Based on this research, it shows that the implementation of TQM has a positive impact on service quality and price, which in turn increases customer satisfaction.
Implementation of Validity and Reliability Tests on Service Satisfaction Levels of the Spotify Application Using SPSS Software Resmi Hayati, Kinanti; Setiyoningsih, Titi; Izzah, Navisatul; Islamey, Tarisa A; Yuanda, Tiara A
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 5 No. 2 (2024): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v5i2.131

Abstract

Spotify is a legal digital music application widely used for online streaming, especially popular among students. This popularity provides a solid foundation for conducting a case study on user satisfaction levels with Spotify in Indonesia. The research employs a questionnaire to collect data, which is subsequently tested for validity and reliability using SPSS software. The results indicate that several variables, such as improved user experience, user-friendly interface, useful features, and fast performance, have high validity values, with significance levels below 0.05. These variables exceed the r-table, with values ranging from 0.5 to 0.904. In cases where any variable is found invalid, retesting will be conducted to ensure the data is valid. Reliability testing produced a Cronbach's alpha coefficient of 0.772, demonstrating that the data used in this study is reliable, as it exceeds the acceptable threshold of 0.6. Therefore, this research provides valuable insights into user satisfaction levels regarding Spotify's services in Indonesia, making it a trustworthy resource for understanding user experiences and areas for improvement within the application. Overall, the findings contribute to a deeper understanding of user preferences and satisfaction in the digital music streaming landscape.
Effect of Fosroc Cebex-100 and Fly Ash Stabilization on the Microstructural Properties of Soft Soil Farichah, Himatul; Firmansyah, Yerry Kahaditu; Puspitasari, Nia Dwi; Damayanti, Apta Kania
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 5 No. 2 (2024): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v5i2.133

Abstract

This study investigates the microstructural effects of stabilizing soft soil using fly ash and Fosroc Cebex-100. The soft soil used in this study was collected from the construction site of the Northern Ring Road (JLU) Section 1 in Lamongan regency. Firstly, a series of laboratory soil test was performed to obtain the index properties of the soil sample including unit weight, specific gravity, Atterberg’s limits, optimum moisture content, and maximum dry unit weight. The soil was then treated with three variations of fly ash (20%, 25%, and 30%), while the Fosroc Cebex-100 dosage was held constant at 0.45% of the fly ash weight. A CBR test indicated that a 20% fly ash and Fosroc Cebex-100 mixture achieved the highest CBR value. Consequently, this optimal mix was selected for SEM-EDX (Scanning Electron Microscopy - Energy-Dispersive X-ray Spectroscopy) analysis to further examine microstructural characteristics. Additional fly ash and Fosroc Cebex-100 to the soft soil will influence the microstructural properties of the soil. SEM analysis show that addition of fly ash and Fosroc Cebex-100 results in significant changes in the soil matrix, including increased particle bonding, reduced porosity, and a denser overall structure. Moreover, the addition of fly ash and Fosroc Cebex-100 contribute to the presence of iron (Fe) in the treated soil.
Risk Identification and Management Analysis at Company X Using FMEA and EPQ Methods Islami, Mega Cattleya P. A; Rahadian, Yanuar Rafi Rahadian; Bisri, Hasan; Winursito, Yekti Condro
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 5 No. 2 (2024): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v5i2.134

Abstract

This study aims to identify and manage risks in Company X’s instant noodle production process using Failure Mode and Effects Analysis (FMEA) and Economic Production Quantity (EPQ) methods. FMEA is used to analyze potential failure modes, while EPQ optimizes production quantities to minimize storage and overproduction costs. The research identifies key risks such as overproduction, machinery failures, and packaging defects. Data collected includes production volumes, raw material usage, and defect rates. FMEA reveals that overproduction is the primary risk, leading to high storage costs. EPQ calculations are performed to determine the optimal monthly production for three instant noodle variants, resulting in significant cost savings. The study concludes that implementing EPQ alongside FMEA minimizes risks and reduces inventory management costs, highlighting the importance of systematic risk management in production optimization. This approach helps Company X enhance efficiency while cutting purchasing and costs expenses by Rp. 3,900,000.00 per month.
Mini-Review on Renewable Production of Green p-Xylene Muchammad, Raka Selaksa Charisma; Saputro, Erwan Adi; Rohmah, Aisyah Alifatul Zahidah
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 5 No. 2 (2024): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v5i2.135

Abstract

The sustainable and renewable production of p-xylene (PX), a crucial component for polyethylene terephthalate (PET), is increasingly important as an alternative to fossil-based processes. This review examines biomass-derived routes for PX synthesis, emphasizing the use of bio-px production pathways to feasible for commercialization. While bio-PX production offers reduced greenhouse gas emissions, challenges remain in cost, catalyst stability, and energy requirements. Recent innovations in catalyst regeneration and hierarchical structures enhance stability and minimize coke formation. Life-cycle assessments confirm bio-PX’s environmental advantages, suggesting that further research into biomass sources and catalyst efficiency will advance bio-based PX production toward commercial viability in a sustainable bioeconomy.
Review Paper on the Level of Road Surface Damage in Mataram City Fatikasari, Aulia Dewi; Aryaseta, Bagas; Alfiansyah, Achmad Dzulfiqar
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 5 No. 2 (2024): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v5i2.136

Abstract

In Mataram City, the capital of West Nusa Tenggara Province, many road sections have deteriorated, reducing road comfort, safety, and mobility efficiency. Typical forms of road damage, such as cracks, potholes, deformation, and surface wear, demand regular maintenance and repairs to extend road service life. This situation underscores the need for a thorough mapping of road pavement damage to provide a comprehensive overview of the road network’s condition and to support effective maintenance planning. The mapping of pavement damage in Mataram City is also expected to inform more effective decision-making in road management. This study aims to review previous research on pavement damage mapping and apply the findings to road sections in Mataram City. This empirical, data-driven approach is anticipated to provide a thorough perspective on pavement conditions and serve as a foundation for the local government’s efforts to create more effective and efficient road maintenance policies. This study employs a systematic literature review approach to analyze and synthesize existing research regarding pavement damage in road sections using the PCI and Binamarga Methods on Mataram City roads. This study is classified as qualitative research, focused on extracting and synthesizing information from academic papers. Based on the research results from several journal reviews, in the city of Mataram,, several roads still experience visual damage to the pavement surface, including cracking, depression, patching and utility cut patching, and potholes. In addition, the results show that several roads experience fair-level damage based on the PCI method, and some have less than 50% damage to the road surface based on the Binamarga method
Optimization of Nano-Hydroxyapatite Production from Limestone with Effect of Gelatin Concentration and pH in Sol-Gel Synthesis S, Sutiyono; Edahwati, Luluk; Wahyudi, Mohammad Rafli Alif; Rahmah, Nazila Alfi
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 5 No. 2 (2024): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v5i2.137

Abstract

Nano hydroxyapatite is one of the biomaterials that has proven to be a very potential material due to its ability to bind directly with bone tissue. Limestone with a calcium carbonate content of 99.87% was used as a calcium source for the economical and sustainable synthesis of hydroxyapatite. The sol-gel method was chosen for the in situ gelatin synthesis process due to its ability to produce nanoparticles with high homogeneity. The particle size of nanohydroxyapatite can increase the surface area to volume ratio thus affecting the interaction with surrounding cells and tissues. Gelatin was added in various concentrations of 10%, 20%, and 30% as an innovative cell growth support modifier. The synthesis was also carried out at pH 9, 10, and 11 to evaluate its effect on hydroxyapatite formation. Optimal synthesis conditions were obtained at 30% gelatin concentration and pH 10, which resulted in the highest yield of 93.95%. Product characterization included Fourier Transform Infra-Red analysis, which showed the presence of typical hydroxyapatite functional groups (PO₄³-, OH-) and carbonate groups (CO₃²-). Scanning Electron Microscopy characterization showed nano-sized particles in the range of 443-578 nm with a granular structure. Porosity was found to be 72.52% making it ideal for cancellous bone tissue engineering applications.

Page 8 of 9 | Total Record : 87

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