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Rismatul Hasanah; Syamsul Hadi; Gilang Febriyan Mahendra; Muhammad Ilham Sujatmiko; Ahmad Jibril Muqorrobin +1 more

Mars: Jurnal Teknik Mesin, Industri, Elektro Dan Ilmu Komputer 2026 Asosiasi Riset Teknik Elektro dan Informatika Indonesia

The frequent breakage of saw blades and the use of blades that are not suitable for beginner saw operators present a significant problem in metal sawing activities. This study aims to produce a double-sided sharp steel saw blade with dimensions of 310×30×0.8 mm. The production process consists of several stages, namely designing the double-sided sharp saw blade, cutting high-carbon steel material to size, drilling 4 mm diameter holes at both ends with a 310 mm distance between holes, forming sharp edges on both sides of the blade, hardening only the two cutting edges, followed by labeling, packaging, and quality and dimensional standard inspection. The production output is a double-sided sharp steel saw blade measuring 310×30×0.8 mm made from medium carbon steel. The manufacturing cost is Rp. 3,500 per unit with a processing time of 3 minutes per unit. These results indicate that the saw blade can be mounted on a general saw handle and has improved resistance to breakage, making it more suitable for beginner users whose sawing motion is not consistently aligned on a single flat plane.

Zebua, Anistuti; Sandra, Elitzha; Angrayni, Nuria; Sakinah, Sakinah; Nevaldi, Fiken +3 more

Jurnal Pengabdian kepada Masyarakat Wahana Usada (WUJ) 2026 Sekolah Tinggi Ilmu Kesehatan KESDAM IX/Udayana

Background: Pargarutan Julu Village, East Angkola District, South Tapanuli does not yet have a waste disposal site (TPS), causing residents to habitually dump waste into rivers and burn it around residential areas. In addition, the lack of knowledge about natural disaster mitigation is a problem that needs to be addressed urgently. Objective: This community service activity aims to increase public knowledge and awareness through education on waste management (sorting organic and inorganic waste, impacts of river pollution, and the 3R principle: Reduce, Reuse, Recycle) and natural disaster preparedness (floods and fires). Methods: The activity was conducted outdoors in the village at night using lecture, PowerPoint presentation, and interactive discussion methods, involving 35 participants consisting of children and village residents of Pargarutan Julu. Results: The activity showed high enthusiasm from participants, with many questions raised during the interactive discussion sessions. There was an increase in community understanding of the importance of waste sorting, the dangers of dumping waste into rivers, the application of the 3R principle, and steps for preparedness against flood and fire disasters. Conclusion: The participatory outdoor educational approach effectively improved knowledge and awareness of Pargarutan Julu Village residents regarding proper waste management and natural disaster preparedness, and encouraged sustainable behavioral change in the community.

Dehya Al Fathurizqiyah; Corree Nathalia Tarigan; Trias Meiva Aulia; Deana Amelinda Kriswanto; Shahibah Yuliani

Jurnal Sains dan Teknologi 2026 Fakultas Teknik Universitas Cenderawasih

The rapid population growth in urban areas has caused various complex problems, such as congestion, air pollution, and the high use of private vehicles, so that it becomes a challenge in realizing sustainable cities and settlements. Public transportation is present as one of the solutions in overcoming these problems because it can increase community mobility and reduce negative impacts on the environment. This study aims to analyze the implementation of Mass Rapid Transit (MRT), Light Rail Transit (LRT), TransJakarta, and Electric Rail Trains (KRL) in supporting the achievement of SDGs 11 Sustainable Cities and Settlements. This study uses a descriptive qualitative method with a literature study approach. The results show that the MRT and KRL contribute to efforts to reduce carbon emissions and congestion, TransJakarta excels in the aspect of cost affordability while the LRT plays a role in improving urban connectivity efficiently. Thus, public transportation palas an important role in realizing sustainable cities and settlements with the integration between modes of public transportation which is the main factor in supporting the achievement of SDGs 11 optimally.

A. Artifasari; Mardiana Mardiana; Irawati Irawati

Jurnal Pengabdian Masyarakat Sains dan Teknologi 2026 Fakultas Teknik Universitas Cenderawasih

Stroke is a neurological disorder caused by impaired blood flow to the brain, resulting in brain tissue damage and various functional impairments. One of the common problems experienced by stroke patients is sleep disturbance, which may be influenced by neurological deficits, limited physical mobility, pain, and post-stroke anxiety. Persistent sleep disturbances can delay the recovery process and reduce patients’ quality of life. The long-term use of sleeping medications may lead to adverse effects; therefore, safe and easily applicable complementary therapies are needed. This study aimed to determine the effectiveness of peppermint oil aromatherapy in improving sleep quality among stroke patients in the working area of Barebbo Community Health Center, Bone Regency. The method used was the implementation of complementary therapy through the administration of peppermint oil aromatherapy to stroke patients experiencing sleep disturbances. Sleep quality was assessed using the Pittsburgh Sleep Quality Index (PSQI) before and after the intervention. The assessment results showed that before the intervention, patients experienced poor sleep quality, characterized by difficulty initiating sleep, frequent nighttime awakenings, insufficient sleep duration, and daytime fatigue. After receiving peppermint oil aromatherapy, patients demonstrated increased comfort, reduced anxiety, improved ability to initiate sleep, and better overall sleep quality compared to their condition before the intervention. Therefore, peppermint oil aromatherapy was found to be effective in improving sleep quality among stroke patients and can be used as a complementary non-pharmacological intervention in nursing care.

Panjaitan, Dirga Azhar; Siregar, Zekwin; Syaputra, M. Rizky; Zalindri, Diani; Khalijah, Siti +2 more

Jurnal Pengabdian kepada Masyarakat Wahana Usada (WUJ) 2026 Sekolah Tinggi Ilmu Kesehatan KESDAM IX/Udayana

Background:Flooding is one of the most common environmental problems in residential areas and is closely related to poor community awareness of waste management. Improper waste disposal can clog drainage systems, increase the risk of flooding, and lead to various environmental health problems. Objective: This community service activity aimed to improve community knowledge and awareness regarding waste management and environmental health as an effort to prevent flooding in Panompuan Jae Village. Methods: The activity was conducted on May 22, 2026, at the Panompuan Jae Village Prayer House involving 15 women from a local religious study group. The educational methods included lectures, discussions, and interactive question-and-answer sessions. The materials covered waste classification, household waste management, environmental health, and the relationship between environmental cleanliness and flooding. Results: The activity improved participants’ understanding of proper waste management. Participants were able to distinguish between organic and inorganic waste and understood appropriate waste handling practices. They actively participated in the discussion and showed an initial commitment to disposing of waste properly and maintaining environmental cleanliness. Conclusion: The community education program successfully improved public knowledge and awareness regarding waste management and environmental health, supporting flood prevention efforts in Panompuan Jae Village.

Nur Adindha Dewi Antasary; Jumriani Jumriani; Gradina Nur Faizah

Jurnal Sains dan Teknologi 2026 Fakultas Teknik Universitas Cenderawasih

This research is motivated by the importance of implementing Standard Operating Procedures (SOP) in speed boat maintenance activities as a supporting facility for ship agency operations at PT. Sinar Pasific. The high intensity of speed boat usage makes the fleet vulnerable to damage if maintenance is not carried out regularly and according to procedures. Based on initial observations, inconsistencies in maintenance implementation, incomplete documentation, and damage to the engine, electrical systems, and hull were still found, which can disrupt company operations. This study aims to determine the implementation of SOPs, the obstacles encountered, and the efforts made to optimize speed boat maintenance at PT. Sinar Pasific. This research was conducted at PT. Sinar Pasific during the author’s Onboard Practical Training (PRADA) from August 2024 to July 2025. The research method used is a descriptive qualitative method. The data sources were obtained through direct field observation, semi-structured interviews with personnel involved in speed boat operations, and documentation studies related to fleet maintenance activities. The results show that the implementation of Standard Operating Procedures (SOP) in speed boat maintenance at PT. Sinar Pasific has been carried out but has not yet run optimally. This is indicated by inconsistent maintenance schedules, lack of supervision, and incomplete maintenance documentation. In addition, several problems were still found, such as damage to the engine, electrical systems, and speed boat hulls, which can hinder company operations. To overcome these obstacles, the company has made efforts by improving discipline in SOP implementation, conducting regular supervision and evaluation, improving maintenance documentation, and increasing technicians’ understanding of the importance of preventive maintenance so that speed boat conditions are maintained and operational activities run smoothly.

Monika Handayani Br Ginting; Diah Ayu Suryani Sitanggang; Ermina Waruwu

JURNAL ILMIAH PENDIDIKAN KEBUDAYAAN DAN AGAMA 2026 CV. ALIM'SPUBLISHING

This study aims to implement the Cooperative Integrated Reading and Composition (CIRC) learning model to improve collaboration skills and learning outcomes among phase E students in class X-3 at SMA Katolik 2 Kabanjahe in Catholic Religious Education. This research employed Classroom Action Research conducted in two cycles, consisting of planning, implementation, observation, and reflection stages. Data were collected through observation sheets, learning outcome tests, and documentation, then analyzed using descriptive qualitative analysis supported by process and learning achievement indicators. The findings showed that the implementation of the CIRC learning model improved across learning stages, including orientation from 87% to 95%, organization from 90% to 97%, concept introduction from 87% to 92%, publication from 93% to 98%, and reflection and reinforcement from 87% to 98%. Students’ collaboration skills also increased in each indicator, namely working productively from 75% to 88%, actively participating in problem solving from 82% to 88%, maintaining a balance between listening and speaking from 76% to 86%, appreciating group members’ contributions from 73% to 87%, and demonstrating responsibility as group members from 77% to 93%. Learning outcomes also improved, as shown by the increase in the proficient category from 27% to 77%, while the basic and developing categories decreased to 0% in cycle II. These results indicate that CIRC effectively enhances students’ active participation, collaboration, responsibility, and learning achievement. Therefore, CIRC is recommended as an alternative collaborative learning model for Catholic Religious Education, particularly in strengthening cooperative interaction and meaningful understanding of religious learning materials in classroom practice.

Laras Eka Nur Hasanah; Fadean Stefany; Dwi Intan Pakuwita AR

Jurnal Sains dan Kesehatan (JUSIKA) 2026 Universitas Muhamadiyah Manado

This study aimed to examine the association between physical activity and nutritional status as risk factors for noncommunicable diseases among women of reproductive age. A descriptive quantitative study with a cross-sectional approach was conducted in Kranggan Village involving 35 respondents selected through purposive sampling. Data on physical activity were collected using questionnaires, while nutritional status was assessed based on Body Mass Index (BMI). The findings showed that most respondents had moderate physical activity levels (51.4%), followed by low physical activity levels (42.8%). Regarding nutritional status, the majority of respondents were classified as overweight (51.4%) and obese (28.6%). Statistical analysis demonstrated a significant relationship between physical activity and nutritional status (p = 0.003). The results indicate that inadequate physical activity is associated with increased nutritional status problems, particularly overweight conditions. Therefore, low physical activity and excessive body weight represent interconnected risk factors contributing to the development of noncommunicable diseases among women of reproductive age. This study highlights the importance of promoting regular physical activity and maintaining balanced nutritional status as preventive strategies to reduce the risk of noncommunicable illnesses.

Devita Anugrah Anggraini; Didit Damayanti; Kartika Kartika; Tinuk Ervariawati

Jurnal Pengabdian Masyarakat Indonesia Sejahtera 2026 STAI YPIQ BAUBAU, SULAWESI TENGGARA

Joint pain is one of the most common health problems among older adults and may reduce mobility and quality of life. Community self-survey data in Cepoko Village indicated that 55% of residents, particularly older adults, experienced joint pain complaints. One non-pharmacological intervention that can be applied is warm lemongrass foot soaking therapy known as SEHATI (Serai Hangat untuk Kaki). This community service activity aimed to improve elderly knowledge regarding self-management of joint pain and demonstrate warm lemongrass foot soaking therapy as a complementary treatment. The methods included health education, demonstration of warm lemongrass preparation, direct practice by participants, and evaluation through discussion and question-answer sessions. The participants were elderly individuals experiencing joint pain in Cepoko Village, Panekan District, Magetan Regency. The results showed that participants actively engaged in all activities, were able to explain the preparation steps of SEHATI, and understood the benefits of warm lemongrass foot soaking therapy for reducing joint pain. This program provides an easy, affordable, safe, and home-based complementary therapy alternative for elderly people.

Wahyuni, Adela Rahma; Yumei Santi, Mina; Meilani, Niken

Jurnal Mahasiswa Ilmu Kesehatan 2026 STIKes Ibnu Sina Ajibarang

Anxiety during pregnancy is one of the most common psychological problems experienced by pregnant women, particularly during the third trimester when they face childbirth preparation as well as various physical and emotional changes. If not properly managed, anxiety may adversely affect both maternal and fetal health. This study aimed to describe the level of anxiety among third-trimester pregnant women at Mlati II Public Health Center in 2026. This research employed a descriptive quantitative design with a cross-sectional approach. The study involved 40 third-trimester pregnant women selected using a total sampling technique. Data were collected using the Hamilton Anxiety Rating Scale (HARS) questionnaire and analyzed through univariate analysis in the form of frequency and percentage distributions. The results showed that most respondents were of healthy reproductive age (20–35 years) (92.5%), primigravida (67.5%), had a secondary level of education (70%), and were unemployed (70%). The respondents' anxiety levels were categorized as no anxiety (47.5%), mild anxiety (47.5%), and moderate anxiety (5%), while no cases of severe anxiety or panic were identified. The most dominant anxiety indicators were anxious feelings, tension, respiratory symptoms, and sleep disturbances. These findings indicate that some third-trimester pregnant women still experience anxiety, highlighting the need for early detection, health education, and psychological support through antenatal care services to promote maternal mental well-being during pregnancy.

Farhan Abbas; Riyadhul Jinan; Raia Humaini; Aditia Lahakam; Hikmatullah Hikmatullah

The impact of sighar marriage on the younger generation from the perspective of Islamic law, social, and psychological. The main problem raised is the practice of marriage without dowry which places women as objects of exchange, thus ignoring their rights and causing the invalidity of the contract according to a number of scholars. The purpose of this study is to analyze the social, legal, and religious consequences of sighar marriage and its implications on the formation of children's identity and family resilience. The research method uses a literature study with a normative-comparative approach, referring to classical fiqh literature, hadith, and contemporary academic studies that compare the views of the Shafi'i, Maliki, Hanbali, and Hanafi schools. The results of the study show that nikah syighar has an impact on the neglect of women's rights, the normalization of objectification, household instability, the crisis of children's identity, and the weakening of family institutions. In addition, this practice is contrary to maqasid al-shari'ah, thus undermining the sacred value of marriage as worship and a means of moral development. These findings underscore the need for Islamic family law regulation and education to protect the younger generation from the practice of illegal and harmful marriage.

Arief, Jamaluddin; Rana, Varinder Singh; Mammadli, Vüqar Ahmad

Societal Serve: Journal of Community Engagement and Services 2026 Pusat Riset dan Inovasi Nasional Mabadi Iqtishad Al Islami

This community engagement program aimed to strengthen community empowerment through human resource development and employability skills training in West Java Indonesia. The program involved youth groups, unemployed individuals, women’s associations, and local community members who experienced limited access to professional training and workforce readiness opportunities. To address these challenges, participatory workshops, leadership training, career mentoring, and collaborative learning activities were implemented over a three-month period involving 65 participants. The findings demonstrated significant improvements in communication skills, teamwork, leadership competencies, career planning awareness, and problem-solving abilities among participants. Qualitative results also revealed increased confidence, stronger motivation for professional development, and greater participation in community and economic activities. Participants showed improved readiness for employment and entrepreneurship opportunities after completing the program. The integration of human resource development and participatory educational approaches proved effective in promoting employability and sustainable community empowerment

Simanungkalit, Fany Amelia Putri; Romadlon, Fauzan; Aliyah, Khikmatul

ISAINTEK: Jurnal Informasi, Sains dan Teknologi 2026 Politeknik Negeri FakFak

Food waste is still a significant problem, affecting food security, the environment, and the global economy. More than 53% of food produced becomes waste. Food waste worldwide totals 1.3 trillion annually. One of the districts with a high food waste rate is Banyumas. The most significant contributor to waste in the Banyumas region in 2021 was food waste, accounting for 39.85%, with much of it generated by restaurants. Restaurants play an essential role in managing food waste, as most food discarded at the preparation stage cannot be reused. This study aims to analyze the relationship between demographics and food waste reduction to support a digital technology approach from a restaurant perspective. This study used quantitative methods. The respondents of this study were 100 restaurants located in Banyumas, including A La Carte, Ramesan, Tegal, and Padang, and the data were analyzed using ANOVA. The results show that demographic factors, including income, age, restaurant opening hours, and the prices of best-selling foods, influence food waste in restaurants. The recommendation is for restaurants to prepare and plan menus. This will affect food prices, opening hours, and revenue. Some restaurants can increase their knowledge of handling food waste.

Perdian Syah; Agus Suwarno; Annisa Syahliantina

JURNAL ILMIAH TEKNIK INDUSTRI DAN INOVASI 2026 CV. ALIM'SPUBLISHING

The physical work environment in the Aerosol Production Department of PT XYZ experienced problems related to excessive room temperatures reaching 37.3°C and chemical odor pollution caused by vapor recirculation from the coating oven process. These conditions potentially reduced operator comfort and concentration. This study aimed to analyze the effectiveness of the Kaizen approach through the Plan-Do-Check-Act (PDCA) cycle in controlling production room temperature and improving air quality. A quantitative descriptive method with an Action Research approach was employed. Problem identification and root cause analysis were conducted using the 7 QC Tools, particularly the Pareto Diagram and Fishbone Diagram. Improvement actions included the installation of turbine ventilators, aluminum foil roof insulation, and a 3-meter vertical exhaust ducting system. The results showed that the average room temperature decreased from 34.6°C to 27.4°C, representing a reduction of 7.2°C, while the peak daytime temperature decreased by 8.7°C and met the established threshold limit value. In addition, chemical odor pollution was completely eliminated. Therefore, the Kaizen-PDCA approach proved effective in improving the physical work environment sustainably.

Muhammad Daffa Yuwan Syauqillah; Muamar Adnan Agassi

The rapid expansion of social media has intensified the phenomenon of Fear of Missing Out (FOMO), a form of anxiety arising from the perception that others are experiencing more rewarding lives. With more than 5.17 billion active social media users worldwide in 2024, including Indonesians who spend over three hours daily on social media, FOMO has become an increasingly prevalent psychological and social issue. This study employs a qualitative approach using a systematic literature review to examine the relationship between social media use, FOMO, and psychological well-being, while exploring its spiritual dimensions from an Islamic perspective. The analysis draws on Social Comparison Theory, Self-Determination Theory, and Islamic psychospiritual concepts, particularly qana'ah (contentment) as articulated by Ibn Qayyim al-Jawziyyah. The findings indicate that FOMO is strongly influenced by social comparison, declining self-esteem, and compulsive engagement with digital platforms, all of which contradict Islamic values such as qana'ah, tawakkul (reliance on God), shukr (gratitude), and zuhd (detachment from excessive worldly attachment). The study argues that FOMO should be understood not only as a psychological problem but also as a spiritual challenge resulting from the erosion of inner contentment. To address this issue, the study proposes integrating evidence-based digital well-being strategies with Islamic spiritual practices, including mindful dhikr, structured digital detox, and gratitude cultivation. This research contributes to the growing field of Islamic digital psychology by offering an integrative framework for promoting psychological resilience and spiritual well-being in Muslim communities.

Lili Kusniawati; Titi Sri Suyanti

Jurnal Praba : Jurnal Rumpun Kesehatan Umum 2026 STIKES Columbia Asia Medan

Schizophrenia is a mental disorder characterized by deviation in attitudes, thoughts and behaviors, and can cause positive and negative symptoms. One of the most frequently occurring negative symptoms is social withdrawal, which leads to the problem of Social Isolation: Withdrawal. Social isolation is a condition that causes individuals to experience a decline or even inability to interact with others and their environment. The purpose of this case study was to apply nursing care to patients with social isolation: withdrawal due to undifferentiated schizophrenia in Gatotkaca Ward of RSJD dr. Amino Gondohutomo, Central Java Province. This scientific paper was written using a descriptive method in the form of a case study through the nursing process approach. Data collection methods used were interview, observation, documentation study, and literature study. Nursing diagnoses that emerged in the patient with Social Isolation: Withdrawal were Social Isolation as the Core Problem, Low Self-Esteem as the Cause, Risk of Hallucination as the Effect, and Self-Care Deficit as a concurrent problem. Interventions were only carried out on Social Isolation and Self-Care Deficit problems, consisting of SP 1 through SP 3 for Social Isolation and SP 2 for Self-Care Deficit: Grooming. After nursing implementation for 4 days, of the 4 nursing diagnoses that emerged, only 2 nursing diagnoses were intervened, namely Social Isolation and Self-Care Deficit. SP 1 through SP 3 for Social Isolation and SP2 for Self-Care Deficit: Grooming were competently achieved. This indicates that the goals of the Implementation Strategy provided were achieved cognitively, affectively, and psychomotorically.

Lestari Lestari; Nur Asiah; Safrizal Safrizal

Perspektif: Jurnal Pendidikan dan Ilmu Bahasa 2026 STAI YPIQ BAUBAU, SULAWESI TENGGARA

The urgency of this research stems from the knowledge gap regarding contextual factors contributing to the underuse of learning media in rural elementary schools, which has not been adequately addressed in previous research, which has tended to focus on urban contexts. This study aims to examine teachers' perceptions at Sugayang Public Elementary School regarding the underuse of learning media in the learning process, as well as the factors that contribute to it. The method used was a descriptive qualitative method, utilizing in-depth interviews as a data collection technique. The data were then analyzed using data reduction, data display, and conclusion drawing techniques according to Miles and Huberman. The results showed that teachers experienced difficulties in using technology, difficulties in creating learning media, and the perception that using media was time-consuming. This reveals an important pattern that the underuse of learning media is a systematic problem rooted in the TPACK gap that is not supported by practical time management solutions. These findings imply that changes in learning practices will not occur simply through the provision of generic technology tools or training; rather, bottom-up and contextual solutions are needed. The novelty of this research lies in the in-depth qualitative approach applied to the under-researched context of rural elementary schools, which has not been studied before. This research contributes through recommendations for the implementation of a peer-mentoring program and the development of a ready-to-use digital learning media bank, thus offering valuable insights for future research with relevant stakeholders.

Risma Septiani; Esti Nur Janah

Jurnal Praba : Jurnal Rumpun Kesehatan Umum 2026 STIKES Columbia Asia Medan

Vomitus is the forceful expulsion of gastric contents through the mouth, commonly occurring in children as a clinical manifestation of gastrointestinal diseases. Based on medical records of RSUD dr. Soeselo, Tegal Regency, vomitus cases increased to 355 cases in 2025. Therefore, comprehensive nursing care is needed to address problems arising from vomiting in children. This study used a descriptive method in the form of a case study through a nursing process approach, aimed at describing nursing care for a pediatric patient with vomitus. Three nursing diagnoses were identified in An. A with vomitus: Nausea related to gastric irritation/stimulation of the vomiting center, Risk of Fluid Imbalance related to repeated vomiting, and Knowledge Deficit related to lack of information exposure. Nursing interventions provided included Vomiting Management, Fluid Management, and Health Education. After three days of nursing implementation, all three nursing diagnoses were resolved, marked by the disappearance of nausea, improved appetite, normal hydration status (moist mucosa, good skin turgor, pulse 88x/minute), and the patient's mother and patient being able to understand and re-explain health education material about vomitus.

Dwi Anggun Lestari

Jurnal Sains dan Kesehatan (JUSIKA) 2026 Universitas Muhamadiyah Manado

Cognitive development is an important aspect of early childhood growth because it forms the foundation for children’s abilities to think, remember, understand concepts, solve problems, and make decisions. Early childhood is often referred to as the golden age since development occurs very rapidly during this period, requiring appropriate stimulation from the surrounding environment, particularly the family. In this context, parents play a crucial role through the parenting styles they apply in daily life. This study aims to examine the relationship between parenting styles and early childhood cognitive development based on findings from previous research. The method used is a narrative review by analyzing relevant scholarly articles published between 2020 and 2026. Articles that met the inclusion criteria were then analyzed descriptively to identify the relationship between parenting styles and children’s cognitive development. The results of the review of 15 selected articles indicate that there is a significant relationship between parenting styles and early childhood cognitive development. Authoritative parenting emerged as the most consistently positive style, characterized by effective communication, emotional support, balanced supervision, and opportunities for children to develop independent thinking skills. Other factors, such as parents’ educational level, involvement in children’s learning activities, and a supportive learning environment, also contribute to cognitive development. In conclusion, authoritative parenting is considered the most effective approach in supporting optimal cognitive development in early childhood.

Aditya Kris Samudera; Alfat Sulistiya Nugraha; Ninik Martini

Jurnal Riset Rumpun Ilmu Teknik 2026 Pusat riset dan Inovasi Nasional

Diesel engines are widely used in the transportation and industrial sectors due to their high thermal efficiency and good operational durability. However, increased fuel consumption due to inefficiency of the injection system remains a common problem. Injector characteristics, particularly nozzle diameter and injection pressure, are important factors that affect the quality of fuel atomization, air-fuel mixing, and combustion efficiency. An inappropriate combination of parameters can cause suboptimal combustion and increase fuel consumption. This study aims to analyze the effect of variations in nozzle diameter and injection pressure on fuel consumption efficiency in diesel engines. The method used is an experiment with variations in nozzle diameter of 0.150 mm, 0.152 mm, and 0.154 mm and injection pressures of 400 bar, 420 bar, and 440 bar. Tests were conducted at engine speeds of 500 rpm, 1000 rpm, and 1500 rpm with a fuel consumption measurement time of one minute for each parameter combination. Fuel consumption was measured using the volumetric method and analyzed through the fuel volumetric flow rate, fuel mass flow rate, Brake Power (BP), and Brake Specific Fuel Consumption (BSFC). The results showed that the combination of a nozzle diameter of 0.150 mm and an injection pressure of 400 bar produced the lowest BSFC value, thus providing the best fuel consumption efficiency. Meanwhile, the combination of a nozzle diameter of 0.152 mm and an injection pressure of 420 bar showed the closest condition to optimal because it was able to provide a balance between atomization quality and the amount of fuel injected, resulting in efficient and stable combustion. Thus, the efficiency of a diesel engine is influenced by the balance of nozzle size and injection pressure, not solely by the lowest fuel consumption.