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Proceeding of International Conference Health, Science And Technology (ICOHETECH)
Published by Universitas Duta Bangsa Surakarta
ISSN : -     EISSN : 2962634X     DOI : https://doi.org/10.47701/icohetech.v3i1
Core Subject : Health, Science, Engineering,
Computer Science & IT Decision Sciences, Operations Research & Management Health Professions Industrial & Manufacturing Engineering Medicine & Pharmacology
- Health and Medical - Health Information Technology - Science - Engineering - Information Technology
Arjuna Subject : Profesi Kesehatan - Menejmen Informasi Kesehatan
Articles 530 Documents
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Numerical investigation on the combustion performance and emission formation of ammonia spark ignition engine using direct injection and multi coils spark-ignition strategy Windarto, Cahyani; Utami, Indah Wahyu
Proceeding of the International Conference Health, Science And Technology (ICOHETECH) 2025: Proceeding of the 6th International Conference Health, Science And Technology (ICOHETECH)
Publisher : LPPM Universitas Duta Bangsa Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47701/7rxrz521

Abstract

Future internal combustion engines can achieve zero carbon emissions by using ammonia, an efficient hydrogen energy carrier with a greater energy density and a more sophisticated production-storage-transportation lifecycle. Ammonia fuel's laminar flame speed is comparatively sluggish, nevertheless, which leads to less than ideal combustion performance. Investigating the impact of direct injection and the multi-coil method on ammonia spark ignition engine performance was the goal of this study. The simulation's output was then verified using standard diesel fuel and the literature on combustion performance for RCEM engines. At four SOIs between 40o and 0o BTDC, with varying multi-coil spark timing of ignition under high compression ratio of 17, the combustion performance and emission production of ammonia direct injection were examined using the created numerical model. As the timing of the spark increased, there was a tendency for the velocity and turbulence intensity to rise and then decline. Increased spark timing can improve ignition stability, reduce combustion time, reduce cooling loss, and boost output power. Ammonia flame propagation is sensitive to temperature and flow field. Regretfully, when the spark timing increases, the NOx emission progressively increases. By offering a basic ignition method for ammonia engines, this result holds promise for the transition of internal combustion engines to zero carbon ammonia engines.
The Impact of the Greenhouse Education Program on Strengthening Aranding agrocomplex at PT. Natural Nusantara Sari, Devi Linda; Setiyani, Rahmawati; Rahyunanto, Setyo
Proceeding of the International Conference Health, Science And Technology (ICOHETECH) 2025: Proceeding of the 6th International Conference Health, Science And Technology (ICOHETECH)
Publisher : LPPM Universitas Duta Bangsa Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47701/mwwzpg58

Abstract

Study This aims to analyze implementation of educational programs House glass at PT. Natural Nusantara as an effort improvement understanding and skills power Work at a time strengthening product branding strategy agrocomplex . Educational program House glass is one of the innovation company in introduce technology modern, environmentally friendly agriculture environment , and empowered competitive method? the research used is descriptive quantitative with techniques data collection through distribution questionnaire to 20 respondents consisting of from employee House glass , staff , and energy technical company . The data obtained analyzed use percentage to find out the extent to which the program has been implemented in a way effective . Research results show that implementation of educational programs House glass has going well , marked by involvement? active participants , suitability material with needs , and its contribution to improvement knowledge and understanding participant to technology House glass . Thus , the implementation of the education program House glass No only impact on increasing capacity source Power humans , but also an important strategy in product branding strengthening PT. Natural Nusantara agrocomplex .
The Role of Local Wisdom in Driving Innovation and Green Economic Growth through Digital Platforms Oktaviani, Intan; Widyaningsih, Pipin; Triana; Husin, Husna Sarirah
Proceeding of the International Conference Health, Science And Technology (ICOHETECH) 2025: Proceeding of the 6th International Conference Health, Science And Technology (ICOHETECH)
Publisher : LPPM Universitas Duta Bangsa Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47701/99zprq92

Abstract

This study investigates the transformative potential of integrating local wisdom encompassing indigenous knowledge, cultural values, and traditional ecological practices into digital platforms to drive innovation and foster green economic growth, aligning with global sustainability agendas. It highlights how local wisdom, often manifested in heritage crafts, regenerative agriculture, and community-based resource management, serves as a foundation for eco-friendly production systems, ethical trade, and inclusive entrepreneurship when amplified through digital technologies such as e-commerce, traceability systems, and financial technology. Employing a mixed-method approach involving case studies from Asia, Africa, and Latin America alongside quantitative analyses of export growth, job creation, and supply chain resilience, the research reveals that embedding cultural identity and sustainable practices into digital commerce enhances product authenticity, attracts premium markets, reduces carbon footprints through localized production, and empowers marginalized groups, including women and indigenous communities. The findings underscore that such integration not only contributes to fair trade and decent work but also strengthens biodiversity conservation, promotes circular economy principles, and mitigates socio-economic inequalities. The study recommends implementing policy incentives, digital literacy programs, and multi-stakeholder collaborations between governments, platform developers, and cultural institutions to scale these initiatives, ultimately positioning local wisdom as a strategic driver for environmentally responsible, socially inclusive, and innovation-driven economic transformation in the digital era.
THEMATIC FIELD SCHOOL OF SHALLOT COMMODITY AS AN AGRICULTUREAL EXTENSION METHODE TO IMPROVE FARMERS, KNOWLEDGE, ATTITUDES, SKILLS AND PRODUCTIVITY Rahyunanto, Setyo; Sepfrian, Bimoseno
Proceeding of the International Conference Health, Science And Technology (ICOHETECH) 2025: Proceeding of the 6th International Conference Health, Science And Technology (ICOHETECH)
Publisher : LPPM Universitas Duta Bangsa Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47701/qfy6vs81

Abstract

Extension agriculture have important role? for development source Power man agriculture in development agriculture that aims For increase knowledge , attitude , skills And product activity results . Various method extension Already implemented in activity the including school roomy thematic based? approach participatory . Study This aim For know school roomy thematic commodities shallot as method counseling agriculture For increase knowledge , attitude , skills And productivity result . Method study is qualitative descriptive . Informant on study This a total of 30 farmers participant school field . Results study show that school roomy thematic commodities shallot cause a number of matter namely , farmers shallot show category very agree that school roomy increase knowledge And previous skills? they Not yet understand or know . In improvement attitude And productivity results , showing category agree . Recommendation results study is implementation extension agriculture based on participatory with method school roomy thematic more developed again with adapt need farmer .
COMPARATIVE EVALUATION OF HOMOGENEOUS AND HETEROGENOUS CATALYSTS IN THE ESTERIFICATION OF WASTE COOKING OIL Ambarwati, Septiana; Hutapea, Henny Parida; Banuwati, Ameilia Wahyu; Fuadah, Fani
Proceeding of the International Conference Health, Science And Technology (ICOHETECH) 2025: Proceeding of the 6th International Conference Health, Science And Technology (ICOHETECH)
Publisher : LPPM Universitas Duta Bangsa Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47701/sdbf9d88

Abstract

Waste cooking oil is a potential raw material for biodiesel production, yet its reuse poses health and environmental risks due to the presence of carcinogenic compounds and high peroxide values. This study aimed to convert waste cooking oil into biodiesel through the transesterification process using different catalysts—acid (HCl), base (NaOH), and heterogeneous (MgO)—combined with pretreatment methods (untreated, bleaching earth, and banana peel adsorption). The reactions were carried out using ethanol as alcohol, followed by homogenization, heating at 60°C for 1 hour, and settling for 24 hours. The results showed that HCl produced the highest biodiesel yield (up to 3.1792 with bleaching earth treatment), followed by MgO and NaOH. Glycerol was obtained as the main by-product, with the highest values also associated with HCl catalysis. Residues were only formed in reactions involving NaOH and MgO due to their heterogeneous and insoluble nature, whereas no residue was found in HCl-based reactions. Pretreatment with bleaching earth significantly improved biodiesel yield compared to banana peel or untreated samples. In conclusion, acid-catalyzed transesterification of pretreated waste cooking oil, particularly with bleaching earth treatment, provides the most effective route for biodiesel production while also generating glycerol as a valuable by-product.
COPRAS METHOD FOR SELECTING OPTIMAL PUBLIC TRANSPORTATION IN SURAKARTA TO SUPPORT SUSTAINABLE URBAN MOBILITY Diansari, Brillian Nur; Agusti, Febrina; Wibowo, Dimas Satria; Ainurrahman, Arifa
Proceeding of the International Conference Health, Science And Technology (ICOHETECH) 2025: Proceeding of the 6th International Conference Health, Science And Technology (ICOHETECH)
Publisher : LPPM Universitas Duta Bangsa Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47701/ath8pv29

Abstract

This study aims to identify the most suitable public transportation mode in Surakarta to support sustainable urban mobility by applying the Complex Proportional Assessment (COPRAS) method. The research considers six evaluation criteria, namely convenient user, user safety, accessibility and inclusivity, fee, time efficiency, and mobility, which reflect both service quality and efficiency aspects of urban transportation. The alternatives assessed include Batik Solo Trans (BST), van, pedicab, taxi and taxibike (online and manual), representing the main public transport modes available in the city. The methodology involves normalizing the decision matrix, applying the assigned weights to the criteria, and calculating the positive and negative significance values for each alternative, followed by determining their relative significance and utility values. The findings indicate that among the alternatives, van with 100,00 achieved the highest utility value, making it the most appropriate choice for enhancing public transportation services in Surakarta. The results demonstrate that the COPRAS methos provides a systematic and balanced approach for integrating benefit and cost criteria, offering practical insights for policymakers in developing to promote efficient, inclusive, and sustainable urban transportation systems
DESIGN MAINTENANCE OF STITCHING MACHINE MAINTENANCE BASED ON THE RELIABILITY CENTERED MAINTENANCE (RCM) METHOD Buwono, Ringgo Ismoyo; Costa, Lourdes Alice Soares; Agusti, Febrina; Ridzuan, Ilyas Syafiq Darul
Proceeding of the International Conference Health, Science And Technology (ICOHETECH) 2025: Proceeding of the 6th International Conference Health, Science And Technology (ICOHETECH)
Publisher : LPPM Universitas Duta Bangsa Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47701/8nd04183

Abstract

Machine maintenance and repair are essential to maintain optimal machine performance. Downtime is a situation where damage occurs to a machine component or when the machine restarts after undergoing a repair or replacement process. CV Madyotomo is a printing company that experienced a total of 20,114 minutes of machine downtime, resulting in a financial loss of Rp 50,285,550. This study aims to design a maintenance system on the Müller Martini 321 stitching machine at CV Madyotomo using the Reliability Centered Maintenance (RCM) approach. The results of the Failure Mode and Effect Analysis (FMEA) analysis show four critical components, namely bearing (RPN 240), v-belt (RPN 189), shaft gear (RPN 175), and support gear (RPN 160). The critical components are bearing, v-belt, shaft gear, and support gear. The application of the RCM method and the integration of the 5R concept has been proven to minimize downtime, extend the life of critical components, and increase the efficiency of the production process
THE EFFECT OF ONE EGG A DAY PROGRAM ON WEIGHT WITH STUNTING IN JETIS VILLAGE Utami, Dyah Rahmawatie Ratna Budi; Haryoto; Husain, Fida; Utomo, Chandra Wisnu; Utomo, Maryatun
Proceeding of the International Conference Health, Science And Technology (ICOHETECH) 2025: Proceeding of the 6th International Conference Health, Science And Technology (ICOHETECH)
Publisher : LPPM Universitas Duta Bangsa Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47701/fnc5x356

Abstract

Background: The nutritional status of toddlers is an important indicator of public health. Malnutrition during infancy can impact growth, cognitive development, and the risk of chronic disease in the future. Eggs are a source of high-quality animal protein and have the potential to be a simple intervention to improve the nutritional status of toddlers. Objective: To determine the effect of the 1-egg-a-day program for 1 month on the weight of stunted toddlers. Methods: A quasi-experimental study with a pre-test, post-test, and control group design was conducted on 18 toddlers aged 6–59 months in Jetis Village. The intervention group was given 1 boiled egg daily for 30 days, while the control group received no intervention. Weight was measured using a calibrated scale. Data analysis used a paired t-test due to the normally distributed data. Results: The average weight gain of toddlers was 0.3 kg with a p-value of 0.0001. The highest increase was 0.8 kg. Conclusion: The 1-egg-a-day program for 1 month had a significant effect on weight gain of toddlers in Jetis Village.
THE FUNCTIONS OF EXPRESSIVE SPEECH ACTS AND THEIR EMOTIONAL DEPICTION IN THE FILM OF DISNEY’S MALEFICENT Maskuri, Sri Kuncoro Dibyo Sarjono; Syafrianto; Carreon, Jonathan Rante; Istiqomah, Fitria Naimatul
Proceeding of the International Conference Health, Science And Technology (ICOHETECH) 2025: Proceeding of the 6th International Conference Health, Science And Technology (ICOHETECH)
Publisher : LPPM Universitas Duta Bangsa Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47701/s4cmpw44

Abstract

This investigation aspires to identify the functions of expressive speech acts performed by the characters in the film of Disney’s Maleficent. Using pragmatic approach the investigation analyzed how these expressive utterance relate to basic emotions. The qualitative descriptive method was used in the recent investigation; dialogues from the film script were collected, grouped into twelve categories of expressive acts, and examined based on six core emotions. The results indicated that eleven functions of expressive speech acts were identified, they were complaint, lamentation, greeting, compliment, apologies, protest, deplore, boast, praise, thanking, and congratulating. The expressive functions were used to highlight the themes of betrayal and conflict in the film. In addition, the expressive functions reflected the basic emotional states of the characters in the film. The basic emotions emerged in the utterances of expressive functions were anger, happiness, sadness, disgusting, fear, and surprise. These findings suggested that expressive actions not only facilitated communication but also reflected emotional states and narrative conflicts. This research enhances the understanding of how films utilize language to depict complex emotions and enrich character development.
THE POTENTIAL OF CNT-PVA MEMBRANE AS A GREEN TECHNOLOGY ALTERNATIVE Hutapea, Henny Parida; Ambarwati, Septiana; Putri, Rafika Aulia; Aulia, Michell
Proceeding of the International Conference Health, Science And Technology (ICOHETECH) 2025: Proceeding of the 6th International Conference Health, Science And Technology (ICOHETECH)
Publisher : LPPM Universitas Duta Bangsa Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47701/0g320j79

Abstract

The development of advanced membrane technologies is essential for addressing environmental challenges, particularly in wastewater treatment and oil-water separation. Polyvinyl alcohol (PVA) is a hydrophilic, environmentally friendly polymer commonly used for membrane fabrication; however, it suffers from high swelling and low mechanical strength, which limits its long-term performance. To overcome these drawbacks, carbon nanotubes (CNTs) were incorporated into the PVA matrix to form PVA-CNT composite membranes. CNTs serve as structural reinforcements, enhancing mechanical strength, thermal stability, and inter-chain bonding within the PVA network. The interconnected pore structure and high conductivity of CNTs also improve membrane selectivity and reduce swelling by stabilizing the polymer structure when exposed to water or aqueous solutions. Additionally, the modified surface properties provided by CNTs result in superior fouling resistance, minimizing pore blockage and maintaining water flux over extended operation periods. This study demonstrates that PVA-CNT composite membranes offer a sustainable and energy-efficient solution for separation processes, making them highly suitable for oil-water separation, industrial wastewater treatment, and other filtration applications such as water purification and organic compound removal. The findings highlight the potential of PVA-CNT membranes as a green technology that combines high performance with environmental sustainability. PVA-CNT membranes offer a promising approach for developing next-generation membranes with optimized structural and functional properties for environmental applications.

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