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Dadang Hermawan
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Analisis Campuran Minyak Plastik (Polypropylene) Dengan Dengan Gasoline Oktan 92 Pada Proses Pembakaran Premixed Luqvian, Alvan Ade; Soebiyakto, Gatot; Farid, Akhmad; Hermawan, Dadang
SINTA Journal (Science, Technology, and Agricultural) Vol. 6 No. 1 (2025)
Publisher : Perkumpulan Dosen Muda (PDM) Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37638/sinta.6.1.%p

Abstract

Penelitian ini bertujuan untuk (1) mengetahui pengaruh komposisi campuran minyak (polypropylene) dengan gasoline oktan 92 terhadap temperatur api selama proses pembakaran premixed (2) mengetahui karateristik perubahan tinggi dan lebar api yang dihasilkan dari pembakaran campuran minyak (polypropylene) dengan gasoline terhadap pembakaran premixed. Metode dalam penelitian ini adalah metode kuantitatif. Hasil penelitian dari campuran minyak polypropylene dengan gasoline diperoleh data temperatur tertinggi adalah gasoline dengan nilai temperatur 93,40 0C, lebar api 1,378 dan tingginya 7,583 yaitu campuran 90:10. Untuk campuran 80:20 mendapat temperatur 89,11 0C, lebar 1,248cm dan tingginya 6,949cm. Untuk campuran yang ketiga 70:30 temperaturnya 80,850C, lebar 1,161cm dan tinginya 6,671cm. Sedangkan untuk gasoline sendiri nilai temperturnya 79,96 0C, lebar api 1,902cm, tingginya 6,448cm dan untuk minyak polypropylene yaitu 73,480C, lebar api 0,982cm, tinngi api 5,798cm.
Analisis Pengaruh Penggunaan CDI Racing terhadap Performa Sepeda Motor Matic 115 cc Aprianto, Wahyu Rizki; Farid, Akhmad; Hermawan, Dadang
PROTON Vol. 13 No. 1 (2023): PROTON: Jurnal Ilmu-ilmu Teknik Mesin
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jp.v13i1.6995

Abstract

Replacing a standard CDI with a racing CDI is one way to improve ignition in a motorcycle engine and is expected to produce more complete combustion in the combustion chamber. The treatment in this study is the different types of CDIs used on motorcycles. The results show that the effect of CDI replacement on the power produced is a significant difference in power on standard CDI at RPM 5000 which is 5.7 HP while on CDI Rextor at RPM 8000 it is 7.3 HP. The significant difference in torque at RPM 1500 is 18.58 Nm while the CDI Rextor at RPM 2000 is 19.6 Nm. The power and torque produced by CDI Rextor are higher than the standard CDI. The amount of ignition produced by CDI Rextor greatly affects the size of the power and torque produced on the bicycle and the combustion pressure force will be maximized.
Pengaruh Pencampuran Minyak Plastik (Low Density Polyetylene) dengan Pertamax Terhadap Profil Nyala Api Premixed Dlofir, Aan Taufik; Hermawan, Dadang; Suwandono, Purbo
PROTON Vol. 13 No. 1 (2023): PROTON: Jurnal Ilmu-ilmu Teknik Mesin
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jp.v13i1.6996

Abstract

Plastic oil has great potential in the utilization of renewable energy both in Indonesia and in the world. Plastic oil (Low Density Polyethylene) is a fuel produced from the pyrolysis process of plastic waste and has an octane value of 81.6, so the quality of the fire is low. This study aims to improve the quality of plastic oil fire, namely by mixing plastic oil with Pertamax fuel. Plastic oil as the main material while Pertamax as an additional material, with variations in the composition of the Pertamax mixture ranging from 20% to 80%. Fire characteristics seen during the research process are flame height, flame temperature and flame color with premixed combustion using a burner. From the results of fire color research, there is an increase in blue color with each addition of Pertamax fuel to plastic oil. The blue color itself means that the fuel has a high calorific value. The increase also occurred in the height of the fire where the height of the fire increased with each addition of Pertamax fuel to plastic oil. Likewise, the fuel temperature increased when Pertamax was added, because Pertamax has a better heating value than plastic oil. From these three things it can be concluded that by providing the addition of Pertamax fuel, it is able to improve the quality of the flame from the processing of plastic waste, namely in the form of plastic oil.
Analisa Zat Additive pada Carbon Black Nerox 600 terhadap Efek Floating dan Flooding dalam PVC Coating Candra, Ferdika Dwi; Fadhillah, Arief Rizki; Hermawan, Dadang
PROTON Vol. 13 No. 2 (2023): PROTON: Jurnal Ilmu-ilmu Teknik Mesin
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jp.v13i2.7001

Abstract

Carbon black is currently widely used in the office world and is easy to obtain, one of which is widely used as printer ink, copier toner, reinforcing agent in the use of plastic, paper, and as a building material. So that carbon black is very easy to find on the market. Because of this uniqueness, the purpose of this research is to make carbon black as an alternative material in the rubber reinforcement process by using a type of carbon black obtained from photocopier toner with type nerox 600 combined with the addition of a percentage of BYK9067 additives using floating and flooding methods. BYK9067 additive is often used as a mixture in PVC coating with alkylammonium salt content. By using these additives as a variation of PVC paint, the best improvement was obtained in the addition of additives in the 3% variation obtained from observations and data analysis of the effect of floating and flooding in PVC coating
Efisiensi Biaya Distribusi Produk Stone Crusher Plant Pratama, Rizqi Fajar; Wicaksono, Leo Hutri; Hermawan, Dadang
PROTON Vol. 14 No. 1 (2024): PROTON: Jurnal Ilmu-ilmu Teknik Mesin
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jp.v14i1.7007

Abstract

In the utilization of natural products, one of which is stone, has a variety of functions and many industrial sectors require these products with certain sizes and specifications. The high demand must of course be in line with the availability of products of course with a variety of market demand criteria. From the industrial sector, careful planning needs to be done such as the risk when running production. Determining the right tool is needed to be optimal. As well as being able to maintain commitment to customers. The productivity of Stone Crusher plays a full role as the selling point of the stone products produced. Of course, understanding the production capacity of the tool is very necessary to maintain commitment with consumers and minimize the non-achievement of consumer demand. In the stone crusher project in Medan based on the analysis of production of 100 tons / hour or 71.42 m3 / hour for 8 hours of production with a stone density of 1400 kg / m3, the transport capacity is 200 m3 / day.
Pengaruh Temperatur dan Zeolit terhadap Volume dan Nilai Kalor Tar Pada Proses Pirolisis Serbuk Batang Bambu Anggunio, Cornelius; Hermawan, Dadang; Suwandono, Purbo
PROTON Vol. 14 No. 1 (2024): PROTON: Jurnal Ilmu-ilmu Teknik Mesin
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jp.v14i1.7010

Abstract

Waste is a problem in Indonesia, both organic and non-organic waste. Bambo powder is an organic waste that can still be utilized to produce energy using the pyrolysis method. The research aims to utilize bambo waste to produce tar using pyrolysis process with temperature variation and with the addition of zeolite. The research method uses 200 g of bamboo powder with a moisture content of less than 2% and 40 g of zeolite and a heating process with a duration of 3 hours. The pyrolysis gas was condensed to obtain tar. The research produced the most tar products at a temperature of 550 ⁰C as much as 57 milli and 72 milli in the addition of zeolite. In the pure pyrolysis process, the highest calorific value was obtained at a temperature of 450 ⁰C amounting to 149.27 (cal/g) at the addition of zeolite, the highest calorific value was obtained at a temperature of 550 ⁰C amounting to 248.29 (cal/g). This shows that adding zeolite to the pyrolysis process can increase the amount of tar when compared to pure pyrolysis both in quality and quantity.
Pengaruh Berat Weight Roller Terhadap Daya, Torsi, dan Topspeed pada Honda Beat Resdianto , Agus; Hermawan, Dadang; Farid, Akhmad
PROTON Vol. 14 No. 2 (2024): PROTON: Jurnal Ilmu-ilmu Teknik Mesin
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jp.v14i2.7015

Abstract

CVT (Continuous Variable Transmission) components have several components that must be considered, one of which is the roller component that is often used on the 2013 Beat automatic motorbike. The rollers found on automatic motorbikes consist of two types. The rollers have different masses on both parts. Based on the mass of the two types of rollers, a study was conducted using the experimental method, which is a form of study to find cause and effect (causal relationship) between two factors by eliminating or reducing or setting aside other interfering factors. The study was conducted to determine the effect of replacing the roller with a mass of 15 grams on power, torque and top speed on the 2013 Honda Beat motorbike. The testing tool used in this study used a dynamometer that was able to analyze the effect of roller mass on the power generated by the automatic motorbike and also the centrifugal force of the roller. The lighter the roller weight, the smaller the centrifugal force generated. However, at high engine speeds, centrifugal force will decrease faster than rollers that have a heavier weight. The torque obtained in the use of 13 gram and 15 gram rollers respectively is 9.24 Nm, 8.79 Nm obtained at 6000 rpm engine speed. While the top speed obtained from the use of 13 gram roller is 75.06 km / h in 1 second, and the top speed achieved by the 15 gram roller is 78.65 km / h in 1 second.
A Machine Learning-Based Approach for Retail Demand Forecasting: The Impact of Spending Score and Algorithm Optimization Adriani, Ni Putu Erica Puspita; Huizen, Roy Rudolf; Hermawan, Dadang
Jurnal Ilmiah Teknik Elektro Komputer dan Informatika Vol. 11 No. 2 (2025): June
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/jiteki.v11i2.30630

Abstract

Demand forecasting in the retail industry remains a critical challenge, with inaccurate predictions leading to substantial inventory inefficiencies, financial losses, and reduced customer satisfaction. Traditional forecasting methods, primarily reliant on historical sales data, often lack the capacity to effectively model the complexities of dynamic consumer behavior and rapid market fluctuations. To address this, this study proposes a refined demand forecasting approach through the introduction of the Spending Score, a novel synthetic feature that synthesizes customer purchase frequency and total spending to augment predictive accuracy. We implement and optimize machine learning algorithms, specifically Random Forest, Decision Tree, and Support Vector Machine (SVM), using rigorous hyperparameter tuning techniques to determine the most effective model for retail demand prediction. Utilizing detailed customer transaction data, this research aims to identify key purchasing patterns that significantly influence demand variability. By integrating the Spending Score into our predictive models, we provide a data-driven framework enabling retailers to optimize inventory management, enhance targeted marketing strategies, and minimize operational inefficiencies. Empirical results demonstrate that the inclusion of the Spending Score leads to more stable and accurate demand forecasts, facilitating improved alignment between supply and market demand. While acknowledging potential limitations, including data scalability issues and the risk of feature-induced bias, future research will explore the integration of real-time data streams, advanced deep learning methodologies, and expanded datasets to further improve predictive capabilities and model adaptability in the continuously evolving retail landscape.
Strategi Pemasaran untuk Meningkatkan Occupancy Kamar Hotel di Bali melalui Peningkatan Kapasitas SDM yang Bekerja Ada Online Travel Agent Dadang Hermawan; I Made Darsana; I Gusti Made Sukaarnawa; I Putu Arnawa
Jurnal Ekonomi, Manajemen Pariwisata dan Perhotelan Vol. 4 No. 3 (2025): Jurnal Ekonomi, Manajemen Pariwisata Dan Perhotelan
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jempper.v4i3.5087

Abstract

The hotel industry in Bali is facing various challenges that have resulted in low occupancy rates. Some of the main factors contributing to this problem include increasingly fierce competition between hotels, fluctuations in tourist demand due to seasonal and global factors, and the suboptimal utilization of digital marketing channels through Online Travel Agent (OTA) platforms. One of the main causes of this suboptimal utilization of OTAs is the limited capacity of human resources (HR) to effectively manage these platforms. Many HR have not yet mastered digital marketing strategies, are unable to optimally manage hotel listings, and lack the skills to provide superior online customer service. This study aims to formulate an effective marketing strategy by improving HR competency in OTA management. The strategy focuses on digital marketing training, improving customer service quality, and optimizing information and the display of hotel listings on OTA platforms. The method used is a qualitative approach through case studies of several hotels in Bali. Data collection techniques were carried out through in-depth interviews with hotel managers, digital marketing staff, and employees directly involved in OTA management. The results show that improving HR competency through structured training and continuous development has a significant impact on increasing the number of room bookings and occupancy rates. Competent human resources can maximize hotel visibility on OTAs, respond to customer needs more quickly and accurately, and build long-term relationships with them. Integrated marketing strategies with improved human resource quality have proven key to increasing hotel competitiveness, room occupancy, and overall revenue.
STUDI PENGARUH KOMBINASI REINFORCEMENT SERAT KULIT POHON WARU DAN KARBON KEVLAR TERHADAP IMPACT STRENGTH KOMPOSIT LAMINATE Saputra, Akhmad Rizki; Huda, Khisbullah; Fadhillah, Arief Rizki; Hermawan, Dadang
Prosidia Widya Saintek Vol. 4 No. 2 (2025)
Publisher : Universitas Widyagama Malang

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

Abstract

Perkembangan teknologi industri material telah mendorong pencarian material alternatif yang ringan, kuat, murah, dan ramah lingkungan. Salah satu solusi adalah penggunaan serat alam, seperti serat kulit pohon waru (Hibiscus tiliaceus), yang memiliki karakteristik mirip logam. Selain itu, serat karbon Kevlar juga digunakan sebagai material penguat dalam komposit. Penelitian ini bertujuan untuk menguji pengaruh serat kulit pohon waru dan serat karbon Kevlar terhadap harga impact dan energi yang diserap pada komposit laminate. Hasil penelitian menunjukkan bahwa komposit dengan serat karbon Kevlar memiliki harga impact rata-rata tertinggi, yaitu 213,85 Joule/mm², karena kekuatan serat karbon Kevlar yang lebih tinggi serta sifat sintetiknya yang lebih rapat dibandingkan serat alam. Sebaliknya, komposit dengan serat kulit pohon waru memiliki harga impact rata-rata terendah, yaitu 32,23 Joule/mm². Namun, kombinasi antara serat kulit pohon waru dan serat karbon Kevlar menghasilkan harga impact yang lebih tinggi dibandingkan hanya menggunakan serat kulit pohon waru, dengan nilai 134,90 Joule/mm². Foto patahan menunjukkan bahwa titik patahan pada berbagai variasi tidak dapat diprediksi, karena patahan dapat terjadi pada posisi yang tidak dapat ditentukan. Penelitian ini membuktikan bahwa kombinasi serat kulit pohon waru dan karbon Kevlar memberikan kekuatan yang lebih baik dibandingkan serat kulit pohon waru.
Co-Authors ., silviana AA Sudharmawan, AA Adriani, Ni Putu Erica Puspita Agung Suprapto, Agung Andi Nugroho Andy Hardianto Anggunio, Cornelius Aprianto, Wahyu Rizki Arie Restu Wardhani Arief Rizki Fadhillah Arifah Bunga Fathimah As, Dikri Ilham Asmah Amir Assery, Wardah Aswan Aswan Awan Uji Krismanto Ayu, Dewi Baihaqi, Rosiawan Bambang Hendiswara Budi Tjahjono Cahyo, Agung Dwi Candra Ahmadi, Candra Candra, Ferdika Dwi Dendi Riswandi Dewi, Ni Putu Dilia Dian Pramana Dian Rahmani Putri, Dian Rahmani Diana, Ai Dilia, Dilia Dewi Djuwarsa, Tjetjep Dlofir, Aan Taufik Eko Yohanes Setyawan Elvina Zahrah Ramadhina Evans, Richard Fachrudin Fachrudin Faqih Rofii Fathonah, Annisa Siti Febi Rahmadianto Gatot Soebiyakto Gatot Soebiyakto Gede Angga Pradipta Hardianto, Andi Hartanto, Albertus Niko Kristian Harun Alrosyid, Harun Hasanah, Afifah Nur Heni Pujiastuti Huda, Khisbullah Hutri Wicaksono, Leo I Gusti Made Sukaarnawa I Gusti Putu Arlina Ayuningsih, I Gusti Putu I Made Darsana I Putu Arnawa Ida Bagus Suradarma, Ida Bagus Iriananda, Syahroni Ismail*, Nova Risdiyanto Joko Santoso Juniwati, Endang Hatma Kadafu, Abidin Kadek Eka Sapta Wijaya Kautzar, Galuh Zuhriah Khoirul Lisyaniah Kusuma, Tubagus Mahendra Lenang, Elvin Bimbu Ngunju Leo Hutri Wicaksono Limbong , Benny Leonardo Luqvian, Alvan Ade Ma'sumah, Mufidatul Maharani, Ida Ayu Mayasari, Ine Mega Nur Sasongko Millah, Shofiyul Moch. Munawir Amin Mochamad Umar Mai Mochammad Nurcholis Majid Moehaditoyo, Sri Hartutie Muhammad Ilman Nur Sasongko Muhlis Muhlis Mumu Zainal Mutaqin Ngudi Tjahjono Noorsyah Adi Noer Ridha Nova R. Ismail Nova Risdiyanto Ismail Nurdin, Ade Ali Nurida Finahari Nurkholis Hamidi Pakpahan, Rosma Pinandito, Prasetyo Pratama, Rizqi Fajar Purbo Suwandono rahmad Kurniawan Rahmad Kurniawan Rahmani Putri, Dian Redita Dicky Setiawan Resdianto , Agus Rivandir Ukar, Yakobus Rizki Fadhillah, Arief Roring, Anjalita Geraldine Roy Rudolf Huizen Ruhana, Nafisah Sanjaya, Wahyu Saputra, Akhmad Rizki Saroso, Budi Sasongko, M. Ilman Nur Sa’bana, Rifqi Fauzan Siti Zubaidah Stefan Enus, Handry Sumardjo Sunjana, Dhanie Freida Aji Suriansyah Suriansyah Sabarudin Susilo, Tarsisius Syafitri, Rully Dyah Syamsiar, Syamsiar Toto Cimurti Ujang Jenal Wedashwara, I Gede Putu Wirarama Wicaksono, Leo Hutri Wirananda, Wira Zaenuri