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Prasetyo, Yuli; Kumala Mahda H; R. Oktav Yama H; Narava Kansha P

International Journal of Electrical Engineering, Mathematics and Computer Science 2025 Asosiasi Riset Teknik Elektro dan Infomatika Indonesia

The reliability of power distribution systems is a crucial factor in ensuring stable electricity supply for industrial, commercial, and household users. Conventional protection systems often face limitations in terms of real-time monitoring, remote control, and adaptive responses to fault conditions, which can result in longer outage durations and higher operational costs. This research aims to develop a smart protection system for power distribution using Internet of Things (IoT) technology to enhance system reliability. The proposed method integrates IoT-enabled sensors, microcontrollers, and communication modules to monitor critical parameters such as voltage, current, and frequency in real time. Data are transmitted to a cloud-based platform for analysis and decision-making, enabling rapid detection of abnormalities and remote tripping of circuit breakers. The prototype was tested under various fault scenarios, including short circuits and overloads, and demonstrated faster response times compared to conventional systems. Results show that the IoT-based protection system improved fault detection accuracy, reduced downtime, and provided predictive maintenance insights through data analytics. The synthesis of these findings highlights that integrating IoT into protection mechanisms not only increases operational reliability but also supports the transition toward smart grids. In conclusion, the developed system proves effective in addressing the limitations of traditional protection systems by offering real-time monitoring, automation, and enhanced decision-making for modern power distribution networks.

Mohammad Wahyudin; Edy Sumarno; Sunardi Sunardi; Kartika Sekarsari

Jurnal Riset Rumpun Ilmu Teknik 2025 Pusat riset dan Inovasi Nasional

The availability of electrical energy is one of the important factors during learning activities. However, because the electrical system can be said to be very complicated, starting from the generator center all the way to the consumer, there will most likely be a disruption that causes the flow of power to the consumer to be cut off. One of the factors that affect includes environmental factors, maintenance and other factors, so that the learning process is slightly hampered. The purpose of this research is to maintain electricity supply by automatically switching sources and utilizing renewable energy as a reserve for lighting students' practice rooms. Therefore, a system is needed that automatically regulates the switching of primary sources to backup sources. Automatic Transfer Switch or ATS is a device that automatically switches the main power source from PLN to a backup source such as solar panels by setting the time using Time Delay Relay (TDR). TDR functions to regulate the duration of the power source change operation to meet load needs, especially on small loads such as student practice rooms with a voltage of 220 Volts in one language. The advantage of this system is that it is able to automatically switch electricity supply between PLN and Solar Panels with a controlled time lag. The research method involves the installation of electrical panels and Solar Panels using Solar Charger Controller or SCC, Inverter devices. At the time of the study, the adjustment of the TDR setting to set the time lag on the ATS. SCC settings are carried out to obtain Inputs and Outputs in the optimal battery charging process where the measurement results show that When the load of the incandescent lamp is increased from 50Watt to 300Watt, the current increases from 4.47A to 25.2A, while the voltage decreases from 11.7V to 9.8V. In conclusion, the greater the load, the solar panel voltage decreases and the current increases. The results of the study show that the implementation of the automatic transfer switch system is able to automatically switch the electricity supply between PLN and Solar Panels with a controlled time lag.

Dhimas Ardiansyah Surya Atmadja; Alia, Diana; Rizqi Aini Rakhman; Agus Dwi Santoso; Kuntoro Bayu Ajie

Jurnal Riset Rumpun Ilmu Teknik 2025 Pusat riset dan Inovasi Nasional

This study analyzes the potential use of solar cells as a renewable energy source on the MV SARI INDAH. With the increasing demand for energy and the negative environmental impacts of fossil fuels, solar cells provide a promising eco-friendly alternative. The research focuses on developing a prototype system to charge batteries using solar power, converting DC power into AC for ship operations. The methodology includes measuring sunlight intensity, current, and output voltage, while also calculating the battery capacity and the ship’s electrical load. Tests were conducted at various tilt angles, with data recorded hourly over two days to assess performance. The results show that a 75° tilt angle yields the highest voltage, current, and power output when compared to other angles. Based on these findings, the study recommends installing solar panels at a 75° angle on the compass deck. The system design utilizes two panels positioned opposite each other, forming a 150° angle to optimize energy capture. This setup is capable of supplying power to key areas on the ship, such as seven lamps in the E/R 2nd Deck, Control Room, Emergency Generator Room, and CO₂ Room. The system is designed to meet the total daily energy demand of approximately 1,400 Wh, which can be efficiently fulfilled by eight solar cells rated at 50 Wp each, providing a sustainable and efficient energy solution for the vessel.

Muhammad Zahran Fakhri; Rizal Arif Setiawan; Henny Pratiwi Adi

Jupiter: Publikasi Ilmu Keteknikan Industri, Teknik Elektro dan Informatika 2025 Asosiasi Riset Ilmu Teknik Indonesia

The increasing demand for clean water at the Faculty of Engineering, Sultan Agung Islamic University (UNISSULA) Semarang requires an alternative and sustainable water source. One effective solution is the implementation of a rainwater harvesting (RWH) system to meet non-domestic water needs such as toilet flushing, plant irrigation, and campus cleaning. This study aims to analyze the potential utilization of rainwater, design an appropriate RWH system, and evaluate its cost efficiency compared to the use of PDAM (regional water supply company) water. This research employed a quantitative approach by collecting primary data, including roof catchment area measurements and existing rainwater drainage conditions, as well as secondary data such as average rainfall, the number of campus users, and PDAM water tariffs. The analysis consisted of calculating the potential harvested rainwater volume, designing the RWH system, estimating installation costs, and comparing operational costs between RWH and PDAM water usage. The results indicate that the potential harvested rainwater volume from the building’s roof is approximately 7,054.5 liters/day, while the average non-domestic water demand is 3,170 liters/day, allowing water needs to be met during the rainy season. The implementation of the RWH system can also reduce water costs by up to 43,6%, equivalent to IDR 87.615.616 over a 20-year period. Therefore, the application of RWH is an effective and sustainable solution for water management within the campus while supporting operational cost efficiency.

Sapto Supriyanto; Bambang Guritno; Samtono Samtono; Anna Srilestari M; Putria Sri Handayani

An International Journal Tourism and Community Review 2025 Akademi Kesejahteraan Sosial Ibu Kartini Semarang

This study investigates the implementation of a simple supply chain strengthening program to enhance the competitiveness of Indonesian micro, small, and medium enterprises (MSMEs) in the Malaysian market. Indonesian MSMEs face challenges in market entry, including limited knowledge of export procedures, high distribution costs, and low product acceptance due to labeling and packaging issues. The research aims to evaluate whether targeted, low-cost interventions can improve MSME readiness and performance in international trade. A total of 40 MSMEs from the food and beverage, handicraft, and processed product sectors participated, with 55 owners, managers, and employees engaged in training and mentoring activities. Data were collected using pre–post knowledge questionnaires, logistics cost records, product placement monitoring, in-depth interviews, and focus group discussions. The program resulted in a 35% increase in knowledge scores, a 15% reduction in average distribution costs, a rise in product acceptance from 45% to 72%, and successful distribution partnerships for 8 MSMEs, leading to a 180% increase in monthly orders. The findings indicate that practice-based, contextual training combined with logistics optimization and market facilitation significantly enhances MSME competitiveness. Low-cost interventions are shown to be effective and scalable, providing practical guidance for policymakers and support institutions. The study contributes to the literature on MSME export readiness by demonstrating that structured, simple supply chain strategies can deliver measurable outcomes in low-resource settings. Future research should examine larger samples, longer monitoring periods, and additional markets to assess long-term sustainability and sector-specific strategies

Missella Anugrah Widia; Purwatiningsih Purwatiningsih

Riset Ilmu Manajemen Bisnis dan Akuntansi 2025 Asosiasi Riset Ilmu Manajemen Kewirausahaan dan Bisnis Indonesia

PT. CKL Indonesia Raya is a national logistics company established in 2015 in Jakarta, providing services in land, sea, air, and export-import logistics. Recognized for its professionalism and discipline, the company was awarded “Airfreight Forwarder of the Year 2024” by Supply Chain Indonesia. Employee productivity plays a crucial role in determining organizational success, and factors such as work culture and discipline are key in shaping a productive and competitive work environment. This study aimed to analyze the influence of work culture and discipline on employee productivity at PT. CKL Indonesia Raya. The research employed a quantitative method with a survey approach, using questionnaires distributed to 86 employees as respondents. Validity and reliability tests confirmed the appropriateness of the instrument. Data analysis was conducted using t-tests and F-tests. The results showed that both work culture and discipline had significant partial effects on employee productivity (t-count = 4.550 and 5.116 > t-table = 1.663; sig. = 0.001 < 0.05). Furthermore, the simultaneous test indicated a significant combined effect (F-count = 125.092 > F-table = 3.10; sig. = 0.001 < 0.05). These findings demonstrate that strong work culture and high discipline significantly contribute to enhancing employee productivity. Therefore, companies are advised to strengthen these factors through consistent policies, clear communication, and fair implementation to further improve employee performance and organizational competitiveness in the logistics industry.advised to strengthen both through fair and consistent policies to improve performance and competitiveness.

Salma Ashila Firdaus; Eka Nuryanto Budisusila

Switch : Jurnal Sains dan Teknologi Informasi 2025 Asosiasi Profesi Telekomunikasi Dan Informatika Indonesia

This study aims to analyze the operational condition of the distribution transformer at substation PY094, PLN ULP Pringgabaya, with a primary focus on identifying and calculating the level of load imbalance on the consumer side. Data were collected through direct measurements of electrical parameters, including voltage and current in each phase, followed by a detailed analysis of energy losses. The measurement results indicated a significant load imbalance. In Feeder B, the average phase currents were recorded at 103.8 A for phase R, 130.2 A for phase S, and 90.4 A for phase T. Meanwhile, in Feeder D, the average phase currents were 47.4 A for phase R, 18 A for phase S, and 20.4 A for phase T. This imbalance caused notable power losses in the distribution system, with an estimated daily energy loss of 28.94 kWh, assuming the system operates 12 hours per day. To address this issue, load balancing simulations were carried out using ETAP software. The simulation involved redistributing load values across each phase in the two main feeders. Feeder B was simulated at 46.82% of the transformer’s full capacity, while Feeder D was simulated at 12.38% of the total 160 kVA capacity. The simulation results demonstrated that redistributing the load significantly reduced the current imbalance, thereby minimizing power losses and improving the operational efficiency of the distribution substation. Therefore, load balancing strategies are essential for enhancing energy efficiency and ensuring the reliability of electricity supply in distribution networks.

Rafi Wicaksono; Dita Riyani; Rofik Widdayanto; Eka Nuryanto Budisusila

Uranus: Jurnal Ilmiah Teknik Elektro, Sains dan Informatika 2025 Asosiasi Riset Teknik Elektro dan Informatika Indonesia

Clean water distribution in the Community-Based Drinking Water Supply and Sanitation Program (PAMSIMAS) in Kuwasen Lama Village, Gunungpati District, Semarang City, faces the challenge of unequal supply between highland and lowland areas. The main factors that affect these conditions include differences in topography, suboptimal piping network design, and unbalanced water pressure, especially during peak hours. This research proposes a solution based on Internet of Things (IoT) technology using the ESP32 module as a control center, which is integrated with the Blynk application for real-time monitoring and control of the system. The system is equipped with a water flow sensor, water level sensor, motorized valve, and booster pump to increase water pressure in high elevation areas. Two design schemes were tested, namely flow regulation using a motorized valve, and a combination of a motorized valve with a booster pump. The results of the simulation and implementation showed an increase in water pressure stability, equitable distribution, and a decrease in the frequency of supply disruptions. The system also allows for live monitoring of network conditions, facilitates technical decision-making, and improves operational efficiency. With an adaptive and community participation-based approach, this solution has the potential to become a model for PAMSIMAS clean water distribution management that is efficient, sustainable, and responsive to geographical challenges, while strengthening the resilience of clean water services in rural areas.

Putri, Imelda Adelia; Putri, Imelda Adelia; Amsar, Amsar

Digital Business Intelligence Journal 2025 Fakultas Ekonomika dan Bisnis Universitas 17 Agustus 1945 Semarang

his study aims to explore the implementation of Internet of Things (IoT) technologies within the e-commerce supply chain using a systematic and comprehensive Systematic Literature Review (SLR) approach. By critically analysing a broad range of recent studies, it systematically identifies implementation patterns, integration barriers, and strategic opportunities that support efficiency and adaptability in digital supply chains. Findings reveal that IoT plays a pivotal role in enhancing logistics operations, inventory management accuracy, and responsiveness to dynamic market demands through real-time data monitoring. Key challenges include data security vulnerabilities, high initial investment costs, and the complexity of system interoperability. Nevertheless, the long-term benefits underscore the strategic potential of IoT as a transformative component in sustainable e-commerce supply chain development. This review contributes both theoretically and practically to policy development, technological investment strategies, and the design of adaptive IoT-based supply chain models.

Hendro Lisa; Risviyaldi Risviyaldi

Jurnal Bisnis, Ekonomi Syariah, dan Pajak 2025 Asosiasi Riset Ekonomi dan Akuntansi Indonesia

The agricultural sector plays a crucial role in the Indonesian economy, contributing significantly to Gross Domestic Product (GDP), employment, and national food security. Conventional financing is often poorly suited to the unique characteristics of the agricultural sector, prompting the exploration of more adaptive alternatives. Islamic banking, with its principles of fairness and risk-sharing, offers innovative financing solutions. One such contract with significant potential but underutilized is the Salam contract, a purchase-and-sell contract where payment is made upfront and goods are delivered at a later date. This study aims to analyze the characteristics of the Salam contract in depth, identify challenges and opportunities in its implementation in the Islamic agricultural sector, and formulate strategies for optimizing its application. Using a qualitative descriptive research method based on literature review and comparative analysis, this article finds that the Salam contract offers an effective financing solution for farmers' working capital needs, price risk mitigation for farmers, and supply security for buyers. Key challenges include the risk of crop failure, quality risk, moral hazard risk, and limited supporting infrastructure and market understanding. Optimizing the Salam contract can be achieved through the development of innovative contract models, strengthening risk management through takaful instrumentation, utilizing digital technology, improving Islamic financial literacy, and collaboration between stakeholders. The implications of this research are expected to provide practical guidance for Islamic financial institutions, farmers, and policymakers to create a more inclusive and sustainable Islamic agricultural financing ecosystem. With the right approach, the Salam contract has the potential to become a key instrument in Islamic agricultural financing. Its widespread implementation can drive the transformation of the agricultural sector toward a more productive and equitable direction. Sustainable efforts are needed to ensure its effective implementation in the field.

Anggun Sarttika Erinza; Ardi Mustakim

Polygon : Jurnal Ilmu Komputer dan Ilmu Pengetahuan Alam 2025 Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Well water is still one of the main sources of daily water supply for the residents of the Candi Muaro Jambi area. The dependence on well water makes it vital for consumption, cooking, and other domestic activities. However, with the increasing human activity, the development of tourist areas, and environmental changes in the surrounding area, the quality of the well water is at risk of being affected. This study aims to evaluate the feasibility of well water from an environmental and health perspective based on physical, chemical, and biological parameters, referring to the clean water quality standards set by the Ministry of Health of the Republic of Indonesia. The research employs a descriptive quantitative method, with well water samples taken from several points around the residential areas in the Candi Muaro Jambi region. The analyzed parameters include temperature, color, odor, turbidity, pH, nitrate content, metal content (Fe and Mn), and the presence of coliform bacteria. Laboratory test results show that most of the well water samples still meet the established physical and chemical standards, but some wells were found to have coliform levels exceeding the recommended threshold. This condition indicates contamination, most likely from domestic waste, particularly from household sanitation systems that are not ideally located relative to the wells. While the well water in the study area is generally still suitable for daily use, it is recommended that the community performs simple water treatment, such as boiling or filtration, before direct consumption. These measures are crucial to reduce contamination risks and ensure the water's quality for safe consumption and health.

Mgs. Chaikal Dzaki; Emidiana Emidiana; Yudi Irwansi

Uranus: Jurnal Ilmiah Teknik Elektro, Sains dan Informatika 2025 Asosiasi Riset Teknik Elektro dan Informatika Indonesia

The hospital operating room is one of the most crucial facilities in health services, so it requires a stable, reliable, and uninterrupted electricity supply to ensure patient safety and smooth medical procedures. The slightest electrical outage can pose a major risk, given that almost all vital medical equipment in the operating room relies on an electrical power supply. Therefore, the Uninterruptible Power Supply (UPS) system has an important role as a backup solution to ensure the continuity of electrical energy. This study aims to analyze the performance, capacity, and burden of UPS at Siti Fatimah Palembang Hospital using quantitative methods. Data was obtained through direct observation, interviews with technicians, technical documentation, and measurement of current and load power with standard-compliant measuring equipment. The focus of the analysis was directed at the Online Double Conversion type UPS with a capacity of 20 kVA which functions as the main supplier of backup electricity in the three operating rooms. The measurement results show that the total load reaches 8,855.5 VA or equivalent to 44.2% of the total capacity of the UPS. This load comes from 24 units of vital medical equipment, including operating lights, patient monitors, ventilators, anesthesia machines, and electrosurgical devices spread evenly across three operating rooms. With a power factor of 0.92 and a measurement current of 39.8 A, the performance of the UPS is quite efficient and safe to use. This shows that UPS capacity still has spare space to bear additional loads in the event of an increase in the number of medical equipment in the future. The conclusion of this study is that UPS at Siti Fatimah Palembang Hospital is able to work optimally in maintaining the stability of power supply, so that it can ensure the continuity of critical medical services in the operating room.

Annie Purwani; Ichsanul Fikri Umar Irawan; Iqbal Ramadhan

Venus: Jurnal Publikasi Rumpun Ilmu Teknik 2025 Asosiasi Riset Ilmu Teknik Indonesia

Batteries are the primary component in electric motorcycle propulsion systems, playing a crucial role in storing and supplying energy. However, batteries have a limited lifespan, potentially becoming waste after their useful life. Battery waste is categorized as hazardous and toxic waste (B3) because it contains heavy metals and chemical compounds that can negatively impact human health and the environment if not managed properly. As the adoption of electric motorcycles increases in Indonesia, particularly in the Special Region of Yogyakarta (DIY), the issue of battery waste management is becoming increasingly important. Currently, there are no electric motorcycle manufacturers openly willing to manage post-life battery waste, particularly through recycling activities. This situation creates a gap that informal actors could potentially exploit. Informal actors often possess flexibility and basic technical skills, but their capacity to manage battery waste safely and sustainably still needs to be mapped and strengthened. This study focused on mapping the potential capabilities of informal actors in the Special Region of Yogyakarta by 2025. The results indicate that the potential for informal actors capable of providing battery repair services is only around 1%. This figure is very small and therefore insufficient to support future battery waste management needs. Therefore, multi-stakeholder support is needed, from the government and manufacturers to the community, to encourage capacity building among informal actors. This effort is crucial to anticipate the success of the government's 2030 target for electric vehicle conversion, while also ensuring environmental sustainability.

Muhammad Ikhsan Fifaldyovan; Shinta Mardiana Dewi; Ririn Dwi Astuti Kartikasari

Jurnal Pengabdian Masyarakat Terapan 2025 Lembaga Pengembangan Kinerja Dosen

The global maritime sector is currently facing complex multidimensional challenges, triggered by global economic dynamics, climate change, supply chain disruptions, and rising cybersecurity threats. In response to these conditions, the National Shipping Academy in collaboration with the Indonesian Maritime Researchers and Lecturers (IMERAL) held a National Seminar with the theme of Technology and Regulation Transformation in Logistics Risk Management. This activity aims to increase the literacy and capacity of academics, students, practitioners, and regulators in facing maritime logistics challenges through the use of digital technology and strengthening regulations. The seminar was held online via the Zoom platform, presenting speakers from a variety of backgrounds, including academics, industry practitioners, and policymakers. The discussion focused on digital transformation strategies in maritime logistics, harmonization of national and international regulations, and strengthening technology-based risk management systems. The results showed a significant increase in participants' understanding of strategic issues in the maritime sector, especially related to the integration of technology and policies in logistics risk management. In addition, this seminar succeeded in forming a collaborative network between stakeholders, opening up opportunities for cross-sector synergy in the development of sustainable maritime solutions. The policy recommendations compiled from the results of the discussion include the need to accelerate port digitalization, increase the capacity of maritime human resources, and the preparation of regulations adaptive to global dynamics. This activity emphasizes that cross-sector collaboration is an effective strategy in strengthening Indonesia's maritime competitiveness, as well as building national logistics resilience amid global uncertainty.

Irfan Fauji; Bachtiar Efendi

International Journal of Economics and Management Sciences 2025 Asosiasi Riset Ekonomi dan Akuntansi Indonesia

The digital economy has significantly transformed economic growth by introducing innovations in payment systems and financial services. The modernization of payment instruments through monetary policy has enhanced the ability to control inflation and ensure financial system stability. This study aims to analyze the effectiveness of monetary policy and the utilization of the digital economy in maintaining financial stability in Indonesia. Using time series data from 2010 to 2024 obtained from the World Bank, this research applies the Vector Autoregression (VAR) method to examine both short-term and long-term relationships among variables, including e-money, money supply, inflation, exchange rate, interest rate, and credit card usage. The results show that e-money has a significant reciprocal influence on the money supply, while inflation is also affected by e-money and interest rates. The impulse response function demonstrates that the interactions among these variables tend to converge towards equilibrium over time. Variance decomposition analysis indicates that in the short term, e-money primarily drives financial stability, whereas in the medium and long term, the money supply plays a dominant role. Overall, the findings suggest that monetary policy, supported by digital economic systems, effectively enhances financial system stability in Indonesia. This research contributes to understanding the dual effect of digital payment innovations and provides recommendations for policymakers to strengthen financial inclusion, economic resilience, and macro-financial stability in the digital era.

Dielasy Budiarti; Dede Mahdiyah

Jurnal Riset Rumpun Ilmu Sosial, Politik dan Humaniora 2025 Pusat Riset dan Inovasi Nasional

The COVID-19 pandemic has accelerated the vaccination program in Indonesia as an effort to mitigate the health crisis. However, this emergency has also opened up opportunities for the widespread circulation of illegal and counterfeit vaccines, threatening public safety. This article aims to analyze the legal implications of this phenomenon through a normative-empirical approach using case studies. Three main cases are analyzed: the 2016 national counterfeit vaccine case, the 2021 illegal COVID-19 vaccine sales case in North Sumatra, and the falsification of COVID-19 vaccine certificates that occurred between 2021 and 2022. The analysis focuses on identifying legal loopholes, weaknesses in the oversight system, and their consequences for human rights protection and the integrity of public health programs. The results show fragmented oversight of vaccine distribution, weak transparency in the vaccine supply chain, and legal sanctions that have not provided a significant deterrent effect on perpetrators of health crimes. These conditions not only threaten individual safety but also undermine public trust in the national vaccination program. Inconsistent law enforcement and weak inter-agency coordination have exacerbated the situation. Therefore, efforts are needed to strengthen stricter regulations, increase synergy between supervisory and law enforcement agencies, and secure an integrated and transparent health information system. These measures are expected to ensure the security of vaccine distribution and enhance the accountability of the vaccination program in Indonesia, thus optimally protecting the public's right to health.

Ghea Safa Ramadhani; Muhammad Hartana Iswandi Putra

Jurnal Ekonomi dan Keuangan 2025 Asosiasi Riset Ekonomi dan Akuntansi Indonesia

This study aims to analyze the influence of the money supply (M2), the BI Rate, and the COVID-19 pandemic on the demand for bank credit in Indonesia. Credit demand is an important indicator in describing economic activity and financial system stability. This study uses monthly secondary data from January 2017 to December 2023. The analysis method used is Ordinary Least Squares (OLS), which allows for quantitative estimation of the linear relationship between the independent and dependent variables. The results show that the money supply (M2) has a positive and significant effect on credit demand. This suggests that increased liquidity in the economy encourages increased lending activity by the household and corporate sectors. Conversely, the BI Rate shows a negative and significant effect on credit demand, indicating that an increase in the benchmark interest rate has reduced public interest in accessing financing through banks. This finding is in line with conventional monetary theory, which states that interest rates play a crucial role in controlling aggregate demand, including credit demand. The dummy variable for the COVID-19 pandemic shows a negative but insignificant effect on credit demand. This implies that although the pandemic has had a broad social and economic impact, its impact on credit demand is relatively small when monetary variables such as M2 and the BI Rate are taken into account. Overall, the research findings confirm that monetary policy instruments, particularly controlling the money supply and interest rates, play a significant role in influencing the dynamics of credit demand in Indonesia. Meanwhile, external shocks such as the pandemic tend to be more effectively responded to through medium- and long-term fiscal and structural policies.

Andhika Novan Ramadhani; Bambang Irawan; Septyana Riskytasari; Nurhadi Nurhadi

Mars: Jurnal Teknik Mesin, Industri, Elektro Dan Ilmu Komputer 2025 Asosiasi Riset Teknik Elektro dan Informatika Indonesia

Camshaft lift is an important parameter that determines the height of the valve lift, calculated from the valve position when it is completely closed to the fully open position. This component plays a crucial role in regulating the flow of the air and fuel mixture into the combustion chamber. This study aims to improve the performance of a 200cc 4-stroke motorcycle engine through camshaft lift modification, which is expected to affect the characteristics of engine torque and power. Modifications were carried out by designing two types of modified camshafts, namely series A and series B, as a comparison to the standard camshaft. The research method used is experimental testing using a dynamometer to measure engine torque and power at various speeds, ranging from 4,000 to 10,000 RPM. The data obtained were analyzed to determine the effect of each type of camshaft on engine performance. The test results show that the B series camshaft provides the most significant performance improvement compared to the standard and A series camshafts. At 7,500 RPM, the standard camshaft produces an average torque of 19.2 Nm, the A series camshaft 19.6 Nm, while the B series camshaft reaches 21.2 Nm. Meanwhile, at 10,000 RPM, the average power of the standard camshaft is recorded at 22.2 HP, the A series camshaft 24.1 HP, and the B series camshaft reaches 26.3 HP. This increase indicates that the camshaft lift modification is able to optimize the duration and height of the valve opening, so that the supply of the fuel and air mixture to the combustion chamber becomes more efficient. Thus, camshaft modification, especially the B series, is an effective and applicable solution in increasing the performance output of a 200cc motorcycle engine without having to make major changes to the overall engine structure.

A. Junaedi Karso

Discourse on Law and Society 2025 International Forum of Researchers and Lecturers

The war between India and Pakistan has had a devastating impact on the economies of both the countries directly involved and those indirectly affected. The economic impacts of this armed conflict include significant infrastructure damage, reduced production capacity, soaring inflation, rising unemployment, and reduced investment flows. This geopolitical instability has also fueled uncertainty in global financial markets, triggering a "flight to safety" phenomenon, a shift in capital and investment to countries or instruments perceived as safer, such as US government bonds or gold. For Indonesia, this situation has the potential to significantly disrupt national economic stability. One impact is a reduction in foreign direct investment (FDI) inflows, as investors tend to hold back or relocate their investments to more geopolitically stable countries. Furthermore, pressure on the rupiah exchange rate could increase due to global financial market volatility and a decline in international investor confidence. The conflict could also hamper Indonesia's export traffic, particularly to countries with close trade ties with India and Pakistan. Furthermore, these tensions could disrupt global supply chains, particularly for energy and food commodities, many of which pass through strategic trade routes. If the conflict drags on, the price of crude oil and other raw materials could potentially rise sharply, which in turn would increase domestic production costs. This would have a direct impact on inflation and public purchasing power. This situation further complicates the management of Indonesia's monetary and fiscal policies, which currently face significant challenges, such as the imminent maturities of large government debt and a still-widening state budget deficit. The government must take strategic steps to maintain domestic economic stability, strengthen foreign exchange reserves, and encourage export market diversification to reduce over-reliance on conflict-prone countries.

ahmad isfarhanuddin; roisul adib

Jurnal Inovasi Ekonomi Syariah dan Akuntansi 2025 Asosiasi Riset Ekonomi dan Akuntansi Indonesia

This study analyzes the application of the principles of gharar (uncertainty) and ‘adl (justice) in the subsidized LPG supply chain at Pangkalan Fawaid, Gondanglegi District, using the Maqashid Syariah approach. The primary focus of this research is to identify issues related to the distribution of subsidized LPG that involve Islamic economic principles, particularly concerning uncertainty and injustice that may disadvantage the public, especially low-income households. The main issues identified include the uncertainty of distribution schedules, price fluctuations, limited supply, and a lack of transparency in information, leading to unequal access for low-income households. The research employs a qualitative-empirical method with data collection techniques such as in-depth interviews, participatory observation, and document analysis. Five key informants were selected through purposive sampling to provide comprehensive insights into the issues surrounding subsidized LPG distribution. The data analysis used the interactive model by Miles & Huberman, with triangulation validation to ensure the accuracy and consistency of the findings. The results indicate the presence of gharar in several aspects, such as price uncertainty, quotas, and distribution schedules. Price uncertainty causes subsidized LPG prices to often exceed the Highest Retail Price (HET), while uneven distribution leads to injustice in access for households in need. Violations of the ‘adl principle are evident from the unequal and uneven distribution, which leads to access disparities among low-income households. Based on these findings, it is crucial to digitalize the LPG distribution system to make it more transparent, enhance supervision of distribution practices, and strengthen consumer literacy so they better understand their rights and obligations in accordance with Islamic economic principles. With these measures, uncertainty and injustice in subsidized LPG distribution can be minimized, leading to a more equitable and transparent distribution system.