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All Journal Media Mesin: Majalah Teknik Mesin Journal of Mechanical Engineering Science and Technology JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN Jurnal ABM Mengabdi Automotive Experiences Pekodimas : Jurnal Pengabdian Kepada Masyarakat Jurnal Integrasi dan Harmoni Inovatif Ilmu-ilmu Sosial JIPkM Jurnal Pengabdian Masyarakat Biologi dan Sains AMMA : Jurnal Pengabdian Masyarakat IRA Jurnal Pengabdian Kepada Masyarakat Prosiding Seminar Nasional Pengabdian kepada Masyarakat (SINAPMAS)

Retno Wulandari

Universitas Negeri Malang

Author-ID : 3018166

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing Physics Public Health Social Sciences Other

Published : 21 Documents Claim Missing Document

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The Effect of Chemical Pretreatment Process on Mechanical Properties and Porosity of Cellulose Bacterial Film Tito Arif Sutrisno; Heru Suryanto; Retno Wulandari; M. Muhajir; S.M.Shahrul N.S. Zahari
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 3, No 1 (2019)
Publisher : Universitas Negeri Malang

Bacterial cellulose (BC) is a natural polymer which have superior properties, like high porosity, high purity, and high permeability. The study objective is to determine the influence of chemical pretreatment on tensile strength and the porosity of BC. The method was to make BC films from pineapple peel extract through fermentation process for 14 days. The pretreatment was conducted by immersion of BC in BmimCl, H2O2, and NaOH solution with a concentration of 2.5%; 5%; and 7.5 %, heated at 80 °C then dried in the oven, and the samples were then tested by a tensile test using ASTM-D636-V standard, morphology analysis using Scanning Electron Microscope, and porosity analysis. The results indicate that the tensile strength of control sample was 123 MPa, whereas after chemical pretreatment, the tensile strength was decreased with the greater reduction occurred using NaOH pretreatment compared than the other solutions that having a lower tensile strength of 8.54 MPa at 7.5 % of NaOH. The results of porosity show that the value increased after being treated chemically. The BC film porosity was 87.13% after NaOH treatment of 7.5% while BC film untreated had porosity of 19.15%. This phenomenon was occurred due to the increasing pore, so the absorption of water increased.

The Strength of Moulding Sand Consisting of a Mixture of Bentonite, Tapioca Flour, and Sago Flour as a New Binder Formula to Improve the Quality of Al-Si Cast Alloy Andoko Andoko; Riana Nurmalasari; M. Alfian Mizar; Retno Wulandari; Poppy Puspitasari; Avita Ayu Permanasari
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 1, No 1 (2017)
Publisher : Universitas Negeri Malang

The major factors determining the quality of sand casting products are the base sand and the composition of the sand mould and the binding material. In the foundry industry, the most commonly used binder for creating sand moulds is bentonite. However, the price of bentonite is likely to keep rising. This study aimed at discovering a new binder formula associated with the effect of binder composition i.e. bentonite, tapioca flour, and sago flour on the basis of its mechanical and physical properties. The new formula was expected to be a better binder in the production of sand moulds, resulting in high-quality casting products with minimal defects. Moreover, it is probable to be much more economical than bentonite. This research focused on testing the moulding sand composition with a number of different binders, i.e. bentonite, tapioca flour, and sago flour, each in a different proportion. The mixture of the moulding sand with each of the three binders will be tested in terms of its mechanical properties including compressive, shear, and tensile strength. Based on the test results, sago flour has the highest dry compressive strength of 28.6 N/cm2, whereas bentonite has the highest wet compressive strength, i.e. 11.83 N/cm2 and the highest wet shear strength i.e. 3.16 N/cm2. The binder with the highest dry shear strength is tapioca flour with 18.16 N/cm2. Regarding the tensile strength value, bentonite has the highest wet tensile strength of 0.85 N/cm2, while sago flour has the highest dry tensile strength of 1.73 N/cm2.

Effect of Magnetic Field on Diesel Engine Power Fuelled with Jatropha-Diesel Oil Sukarni Sukarni; Partono Partono; Deni Krisdianto; Retno Wulandari
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 1, No 1 (2017)
Publisher : Universitas Negeri Malang

Jatropha oil has characteristics very close to the diesel fuel, so it has good prospects as a substitute or as a mixture of diesel fuel. Previous research showed that jatropha oil usage in diesel engines caused power to decrease. It was probably owing to the higher viscosity of the Jatropha oil compared to that of diesel oil. Installing the magnetic field in the fuel line of a diesel engine fueled with jatropha-diesel oil is expected to reduce the viscosity of jatropha-diesel oil mixture, hence improve the combustion reaction process. This research aims to know the influence of the magnetic field strength in the fuel lines to the power of diesel engines fueled with a mixture of jatropha-diesel oil. The composition of Jatropha oil-diesel was 20% jatropha oil and 80% diesel oil. Magnetic field variations were 0.122, 0.245 and 0.368 Tesla. The results showed that the higher the strength of the magnetic field was, the higher the average diesel engine’s power would be.

Co-Authors Abyan Farras Putra Achmad Chilmi Dzulfikar Aditya Qobli Ramadhan Afif Rizqi Nizar Romadhon Agung Winarno Andi Nugraha Andoko Andoko, Andoko Andri Wisnu Wardana Arien Anjar Puspitosari Suharso Ariyanto, Sudirman Rizki Ata Syifa’ Nugraha Avita Ayu Permanasari Ayu Warestu Baihaqie Danuputra Sudrajat Baihaqie Danuputra Sudrajat Bayu Setiawan Citali Cikargesa Dani Irawan Dani Prasetiyo Deni Krisdianto Dieno Indo Rochmanul Fanani Edwin Rachmanando Eko Susilo Eli Hendrik Sanjaya Endang Sri Andayani Erwin Komara Mindarta Evi Susanti Fahrizal Akbar Rachman Fikri Munif Nashrullah Gilang Putra Pratama Arifiansyah Heru Suryanto I Dewa Putu Eskasasnanda, I Dewa Putu I Nyoman Ruja Ilham Lestadi Putra Jovan Hilmansyah Rantepadang Komarudin Komarudin Kusubakti Andajani M. Alfian Mizar M. Muhajir Mahbub Romdlon Muhammad Melisa Surya Andini Melisa Surya Andini Melisa Surya Andini Melisa Surya Andini Mely Kurnia Monika Dwi Laily Muh Ade Artasasta Muhammad Ali Murtadho Muhammad Idris Effendi Muhammad Reza Pahlevi Muhammad Syiva Thoriq Muhammad Yandi Pratama Partono Partono Pingkan Sihassaleh Pramuko Ilmu Purboputro Rama Adi Setiawan Rangga Ega Riana Nurmalasari Rr. Poppy Puspitasari S.M.Shahrul N.S. Zahari Sarif Hidayat Shinta Yuliana Sinta Yuliana Siti Malikhah Towaf Sudirman Rizki Ariyanto Sukarni Sukarni Suprayitno Suprayitno Taupik Yuhana Tito Arif Sutrisno Yanuar Rohmat A.P Yohana Greace Yudha Rian Pratama Zarin Nafasari

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