https://repository.unisma.ac.id/handle/123456789/110 Publikasi Ilmiah Dosen Program Studi Teknik Mesin 2026-07-14T11:25:47Z https://repository.unisma.ac.id/handle/123456789/2371 The Effect Of Fatty Acid Polarity On The Combustion Characteristics Of Vegetable Oils Droplets Marlina, Ena; Wardana, ING; Yuliati, Lilis; Wijayanti, W. The effect of fatty acid polarity on the combustion characteristics of vegetable oils droplets, CCO and CJO vegetable oil droplets have been studied experimentally with atmospheric pressure and room temperature. The role of intermolecular forces on the combustion characteristics of vegetable oils droplets. CCO and CJO are multicomponent vegetable oils, CCO represents saturated fatty acids while CJO represents monounsaturated fatty acids. The results showed that the burning rate of vegetable oil was influencing by the polarity of the fatty acids that compose it. CCO is dominated by polar fatty acids which shows a stable flame and around a flame shape. CJO which is dominated by non-polar fatty acids the results show an increase in the rate of combustion, the presence of microexplosion and the form of an elongated flame. The large CCO polarity causes the CCO to be more reactive, fast ignition of round and stable flame forms. The small CJO polarity causes the CJO molecules to be less reactive and slow to ignite. the shape of the flame on CJO extends upwards with microexplosion while in the CCO the way of the round flash. This is because of the different fatty acid content and geometry in each vegetable oils. [ARCHIVES] Copyright Article From: IOP Conference Series (Materials Science and Engineering) 2019-03-01T00:00:00Z https://repository.unisma.ac.id/handle/123456789/2339 The Role of Eucalyptus Oil in Crude Palm Oil As Biodiesel Fuel Marlina, Ena; Basjir, Mochammad; Ichiyanagi, Mitsuhisa; Suzuki, Takashi; Gotama, Jeremy Gabriel; Anggono, Willyanto Utilization of crude palm oils (CPO) as biodiesel faces difficulty due to their high level of viscosity. Mixing crude eucalyptus oils (CEO) with CPO may reduce the viscosity due to the presence of aromatic compounds in CEO. The single droplet analysis was performed to determine the characteristics of mixing CPO with the CEO. The results showed that the addition of CEO decreased the viscosity due to the presence of intermolecular attractions, thereby leading to more active molecules in the CPO-CEO mixture. Furthermore, the aromatic compound in the CEO helped in decreasing the CPO flash point, while the aromatic compound in the triglyceride molecule weakens the bonds between molecules. The addition of CEO to CPO tends to reduce the ignition delay due to the presence of cineol content in the CEO, which weakens the van der Waals bond in CPO. [ARCHIVES] Copyright Article from : Automotive Experiences 2020-03-23T00:00:00Z https://repository.unisma.ac.id/handle/123456789/2241 Pemanfaatan Angin di Gedung UNISMA Sebagai Energi Alternatif Pengerak Wind Turbine Type Savonius pada Pengembangan Media Pembelajaran Lesmanah, Unung; Sugiono Pemanfaatan angin sebagai sumber tenaga energi alternatif telah banyak digunakan di berbagai belahan dunia pada saat ini, namun di Indonesia hal ini belum banyak dimanfaatkan, padahal dengan contour geologis di Indonesia yang bergunung dan bukit ini akan banyak menimbulkan angin. Dengan Vertical Axis Wind Turbine, yaitu type Savonius, angin dikonversi menjadi energi listrik. Cara kerja dari Vertical Axis Wind Turbine mengkonversi energi angin menjadi energi listrik adalah ketika angin berhembus turbin angin dipasang pada arah aliran angin sehingga angin menabrak sudu - sudu turbin tersebut sehingga turbin angin berputar, kemudian putaran dari turbin angin diteruskan ke generator untuk diubah menjadi energi listrik. Pada penelitian ini difokuskan angin yang berhembus di lantai 7 Gedung Unisma, dengan harapan penambah wawasan ke mahasiswa bagaimana turbin angin merupakan suatu alat yang mampu mengubah energi angin menjadi energi mekanik dan selanjutnya diubah menjadi energi listrik melalui generator. Hasi penelitian ini, sebuah turbin angin sebagai media pembelajaran dan data yang diperoleh dari hasil pengamatan kecepatan angin 3 m/s, 4,2 m/s dan 5,1 m/s yang menghasilkan daya angin 5,103 Watt, 14,003 Watt, 25,07 Watt. Daya turbin yang dihasilkan 1,79 Watt, 4,901 Watt, 8,775 Watt, sedangkan daya listrik yang diperoleh 1,2888 Watt, 3,5288 Watt dan 6,3184 Watt. [ARCHIVES] Copyright Article from : Jurnal TECNOSCIENZA 2020-05-08T00:00:00Z https://repository.unisma.ac.id/handle/123456789/2215 Optimasi Sifat Mekanis Kekuatan Tarik Baja ST 50 dengan Perlakuan Gas Carburizing Variasi Holding Time untuk Peningkatan Mutu Baja Standar Uji ASTM A370 Lesmanah, Unung; Marsyahyo, Eko; Vitasari, Prima ST 50 steel as a common engineering material, it can be optimized using gas carburizing treatment in Fluidized Bed Furnaces. Gas as carburizing media in the fluidied bed with vaned by holding time variation such as 1 hour, 2 hours, 3 hours, 4 hours, and 5 hours. The holding time variation is to be intern of mechanical properties of the steel. Optimized value of mechanical properties ST 50 was actived in 3 hours of the treatment, it found average of tensile strength 651,7 MPa. The results above were based on A370 ASTM standar. From SEM (Scanning Electron Microscope), fracture model also showed from SEM that the steel has hard and brittle fracture. It can be concluded that optimized steel using gas carburizing treatment shows significant improve of mechanical properties from steels. [ARCHIVES] Copyright Article from : Jurnal Mekanikal-UNTAD 2013-07-01T00:00:00Z