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Online Fun Physics Experiments Untuk Meningkatkan Motivasi Belajar Siswa Sekolah Dasar Yayasan Mutiara Bunda Jember Risse Entikaria Rachmanita; Zeni Ulma
Journal of Community Development Vol. 3 No. 1 (2022): August
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/comdev.v3i1.67

Distance Learning which is currently being implemented as a result of the Covid-19 pandemic which has lasted for almost 1.5 years has caused psychological problems for students. The problems that arise include boredom due to monotonous learning, less interactive, and piling tasks. The level of education that is quite affected due to the implementation of Distance Learning is elementary school education. To overcome these problems, it is necessary to do a learning that is able to restore student motivation in learning. Mutiara Bunda Jember Foundation in collaboration with Renewable Energy Engineering lecturers at the Politeknik Negeri Jember held an interesting and interactive lesson entitled "Fun Physics Experiment". This activity was attended by 30 participants from various grade levels at the elementary school level. The results of the pretest and posttest questionnaires showed that there was an increase in participants' knowledge of light refraction, air pressure, combustion and pressure processes, heat transfer and density. In addition, after the "Fun Physics Experiment" activity, it was found that the level of interest of participants in Physics lessons increased, there were 7 participants who were very interested in Physics lessons and 23 participants were interested in Physics lessons.

Pengaruh Penambahan Serat Kulit Kopi dan Polivinil Alkohol (PVA) terhadap Karakteristik Biodegradable Foam dari Pati Kulit Singkong Febrina Sarlinda; Amrul Hasan; Zeni Ulma
Jurnal Pengendalian Pencemaran Lingkungan (JPPL) Vol. 4 No. 2 (2022): JPPL, September 2022
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/jppl.v4i2.1430

Polystyrene plastic or styrofoam is very popular to be used as a food packaging container even though Styrofoam has a bad impact on health. In addition, Styrofoam also cannot be biodegraded naturally in the environment so the use of syrofoam is also a problem for the environment. One alternative to styrofoam is biodegradable foam (biofoam) made from starch and cellulose. It is safe for health and can be broken down naturally. Cassava peel is rich in starch (carbohydrates) but has low cellulose content. Meanwhile, coffee peel is rich in cellulose and minimal in carbohydrates. Both types of waste have the potential to become biodegradable foam raw materials. The addition of synthetic polyvinyl alcohol (PVA) polymer is expected to improve the mechanical quality of biodegradable foam. This study aims to obtain the best formulation for the manufacture of biodegradable foam from cassava starch with the addition of coffee peel cellulose and PVA. The quality of biofoam evaluated includes tensile strength, water absorption, and biodegradability. The best biofoam characteristics were obtained at the addition of 15% fiber and 15% PVA, resulted in water absorption of 28.87%, the tensile, strength of 2.70 N / mm2, and biodegradability of 93.66% for 30 days.

Pengaruh Katalis NaOH Terhadap Proses Metilasi Senyawa Brazilein Pada Ekstrak Kayu Secang (Caesalpinia sappan linn) Zeni Ulma; Edia Rahayuningsih; Tutik Dwi Wahyuningsih
Jurnal Teknik Terapan Vol. 1 No. 1 (2022): April
Publisher : P3M Politeknik Negeri Jember

Reaksi metilasi adalah reaksi penggantian atom atau molekul dengan gugus metil. Beberapa parameter yang mempengaruhi proses metilasi antara lain rasio bahan dan waktu metilasi, namun hasil metilasi tidak optimal. Pada penelitian ini dilakukan penambahan katalis pada proses metilasi. Penambahan katalis berpengaruh terhadap peningkatan stabilitas warna ekstrak secang terhadap perubahan pH. Variabel yang digunakan dalam penelitian ini adalah konsentrasi katalis 0; 0,002; 0,01; 0,02; dan 0,04 mol/mL. Parameter yang diuji meliputi stabilitas terhadap pH (2, 3, 5, 7, dan 10) dan degradasi warna terhadap oksidator. Konsentrasi katalis penambahan terbaik adalah pada kisaran 0,002 hingga 0,01 mol/mL. Selain itu, adanya katalis NaOH dalam proses metilasi ekstrak secang juga dapat mengurangi degradasi warna yang disebabkan oleh adanya oksidator.

Utilization of Cassava Peel (Manihot utilissima) Waste as an Adhesive in the Manufacture of Coconut Shell (Cocos nucifera) Charcoal Briquettes Bayu Rudiyanto; Intan Rida Agustina; Zeni Ulma; Dafit Ari Prasetyo; Miftah Hijriawan; Bambang Piluharto; Totok Prasetyo
International Journal of Renewable Energy Development Vol 12, No 2 (2023): March 2023
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2023.48432

Coconut shells and waste cassava peels could be used as the main raw material for biomass briquettes for alternative energy sources in Indonesia. This study aims to analyze the quality of briquettes based on a coconut shell and cassava peel adhesive through proximate analysis with three treatment ratio variations. The ratio of coconut shell to cassava peel used varied from V1 (75%:25%), V2 (70%:30%), and V3 (65%:35%). Based on the result, the charcoal briquettes produced have a density of 0.61 gram/cm³-0.66 gram/cm³, water content of 5.51%-7.85%, ash content of 1.50%-2.86%, combustion rate of 0.021 gram/s-0.026 gram/s, and the calorific value of 6,161 cal/gram-6,266 cal/gram. However, all the treatment variations appropriate the SNI 01-6235-2000, the national standard of Indonesia for the quality of charcoal briquette, which includes the calorific value (>5,000 cal/gram), moisture content (<8%), and ash content (<8%). Briquettes with the best quality were generated by V1 with a density of 0.66 gram/cm³, water content of 5.51%, ash content of 1.50%, combustion rate of 0.026 gram/s, and calorific value of 6,266 cal/gram. Furthermore, briquette material from the coconut shell waste with natural cassava peel adhesive can be feasible as an alternative fuel.

Peningkatan Kualitas Briket Ampas Kopi Menggunakan Perekat Kulit Jeruk Melalui Metode Torefaksi Terbaik Qanitah Qanitah; Yurdika Dwi Fatholah Akbar; Zeni Ulma; Yuli Hananto
Journal of Engineering Science and Technology Vol. 1 No. 1 (2023): January
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/jesty.v1i1.3

Energy is generally divided into two, the first is non-renewable energy for example oil, coal, and natural gas while the second is renewable energy such as water power, solar power, wind power, and biomass. Briquettes is one of the developments of biomass as an alternative fuel. The purpose of this study was to make and analyze the characteristics of coffee grounds briquettes using an adhesive from orange peel with torrefaction method. Torrefaction is a low temperature (200-300 oC) carbonization process without oxygen. Briquettes are made by percentage of coffee grounds and orange peel adhesive 70% : 30%, 60% : 40%, and 50% : 50%. Torrefaction process with a temperature of 200 oC within 60 minutes without any air or little air in the furnace with the addition of modified elbows. The results showed that the best composition was found in DK1 with a ratio of 70% coffee grounds with 30% orange peel adhesive, which has density 0.49 gr/cm3, water content 5.11%, volatile matter content 78.33%, bound carbon content 17.31%, 0.62% ash content, and 4656 cal/gr calorific value

Penerapan Teknologi Pompa Irigasi Pertanian Bertenaga Surya di Desa Dukuhdempok Kecamatan Wuluhan Kabupaten Jember Yuli Hananto; Zeni Ulma; Alex Taufiqurrohman Zain; Michael Joko Wibowo; Risse Entikaria Rachmanita
Journal of Community Development Vol. 4 No. 1 (2023): August
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/comdev.v4i1.126

The conversion of agricultural land is an issue that needs attention because of the community's dependence on the agricultural sector and a serious threat to national food security with permanent impacts. Difficulty in irrigating agricultural land is one of the triggering factors for increasing land conversion, then a technology is needed to overcome this problem. The purpose of the implementation of this community service is to make irrigation system support equipment by utilizing renewable energy, namely solar panels. Solar panels are used as an energy source to drive the pump. To find out the effectiveness of the manufacture of solar-powered irrigation pumps, a performance test of the tool is carried out, namely testing of energy gain and water discharge. The solar-powered irrigation pump with a capacity of 800 Wp can operate properly which results in an average energy gain of 940.4 Wh with an average discharge gain of 1.84 liters/second.

Utilization of Cassava Peel (Manihot utilissima) Waste as an Adhesive in the Manufacture of Coconut Shell (Cocos nucifera) Charcoal Briquettes Bayu Rudiyanto; Intan Rida Agustina; Zeni Ulma; Dafit Ari Prasetyo; Miftah Hijriawan; Bambang Piluharto; Totok Prasetyo
International Journal of Renewable Energy Development Vol 12, No 2 (2023): March 2023
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2023.48432

Coconut shells and waste cassava peels could be used as the main raw material for biomass briquettes for alternative energy sources in Indonesia. This study aims to analyze the quality of briquettes based on a coconut shell and cassava peel adhesive through proximate analysis with three treatment ratio variations. The ratio of coconut shell to cassava peel used varied from V1 (75%:25%), V2 (70%:30%), and V3 (65%:35%). Based on the result, the charcoal briquettes produced have a density of 0.61 gram/cm³-0.66 gram/cm³, water content of 5.51%-7.85%, ash content of 1.50%-2.86%, combustion rate of 0.021 gram/s-0.026 gram/s, and the calorific value of 6,161 cal/gram-6,266 cal/gram. However, all the treatment variations appropriate the SNI 01-6235-2000, the national standard of Indonesia for the quality of charcoal briquette, which includes the calorific value (>5,000 cal/gram), moisture content (<8%), and ash content (<8%). Briquettes with the best quality were generated by V1 with a density of 0.66 gram/cm³, water content of 5.51%, ash content of 1.50%, combustion rate of 0.026 gram/s, and calorific value of 6,266 cal/gram. Furthermore, briquette material from the coconut shell waste with natural cassava peel adhesive can be feasible as an alternative fuel.

Arang Kulit Biji Kakao (Theobroma cacao L) sebagai Adsorben untuk Menurunkan Kadar Asam Lemak Bebas pada Pembuatan Biodiesel dari Minyak Jelantah Dafit Ari Prasetyo; Muhammad Rio Aditya Saputro; Zeni Ulma
Jurnal Teknik Terapan Vol. 2 No. 1 (2023): April
Publisher : P3M Politeknik Negeri Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25047/jteta.v2i1.22

Indonesia as one of the largest producing and exporting countries of crude palm oil (CPO). However, Indonesia still has not utilized the potential of the waste that generated by using CPO as cooking oil, namely used cooking oil. The high content of free fatty acids (FFA) in used cooking oil will cause the saponification reaction and interfere the processing into biodiesel. Cocoa bean shell charcoal (Theobroma cacao L) has a K2CO3 content similar to its commercial product, and contains some traces of silicates and sulfates so that it can increase the efficiency of reducing free fatty acids. In this study, tests were carried out to reduce FFA levels in used cooking oil using charcoal from cocoa bean husks activated with HCl, varying the concentrations of 6, 8 and 10 Molar, as well as the temperature treatment during the process of mixing used cooking oil with activated charcoal adsorbent, which was 75 , 100, and 150°C. The best FFA reduction results were found in the A3T2 reactor which reached 80%, where the best HCl concentration was 10 Molar and the temperature of the mixing process with the adsorbent was 100°C and produced a biodiesel yield of 75%. The quality of the biodiesel produced complies with SNI 7182-2015 standards, 867 kg/m3 of density, 0.5 mg KOH/g of acid number, 1.52 cSt of kinematic viscosity, 48.081 MJ/kg of calorivic value and 143.99%- mass of methyl ester content.

Penerapan Energi Surya Sebagai Sumber Energi Penggerak Pompa Air Tanaman Hidroponik NFT (Nutrient Film Technique) Maliya Syabriyana; Fazri Amir; Zeni Ulma; Muhammad Khorul Huda
Jurnal Teknik Terapan Vol. 2 No. 2 (2023): Oktober
Publisher : P3M Politeknik Negeri Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25047/jteta.v2i2.32

Energi merupakan kebutuhan vital untuk menunjang kebutuhan hidup yang meliputi sektor industri, transportasi, pertanian dan kebutuhan rumah tangga. Kebutuhan energi yang paling krusial adalah kebutuhan energi listrik dimana setiap kegiatan sehari hari menggunakan energi listrik Pemanfaatan energi terbarukan (renewable energy) dirasa sangat tepat untuk menggantikan penggunaan listrik konvensional, disamping untuk mengurangi pengeluaran biaya listrik, energi terbarukan juga dapat mendukung terciptanya green energy dan mengurangi penggunaan listrik energi fosil yang semakin menipis. Penggunaan energi matahari (solar panel) merupakan pilihan yang tepat dikarenakan penyinaran matahari yang berlangsung antara 7 sampai 8 jam sehari merupakan potensi yang baik. Tujuan dari penelitian ini adalah untuk merancang dan membuat PLTS sebagai sumber energi penggerak pompa pada tanaman hidroponik NFT (Nutrient Film Technique) dan menganalisis energi rata- rata yang dihasilkan dari sistem konversi energi cahaya matahari menjadi listrik pada panel surya untuk sistem hidroponik NFT. Dari hasil perancangan yang telah dilakukan menunjukkan bahwa energi yang dihasilkan panel surya belum mencukupi kebutuhan beban harian. Total energi tertinggi yang dihasilkan panel surya adalah 330,1 W/ hari.

Analisis Mutu Briket Berbahan Baku Campuran Ampas Teh dan Sekam Padi Menggunakan Perekat Molase Menggunakan Metode Pirolisis Zeni Ulma; Nur Faizin; Reynadi Febri Afiandi
Journal of Sustainable Energy Development Vol. 1 No. 1 (2023)
Publisher : Petroleum Engineering, Faculty of Engineering, University of Jember

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

This study aims to anayze the effect of molasses adhesive composition on the quaity of briquettes made from tea dregs and rice husks and to determine the characteristics of tea dregs and rice husk briquettes using molasses adhesive. The research was carried out through severa stages, namely the preparation of raw materias, drying of raw materias, pyrolysis of rice husks and tea dregs, raw materias mashed with a 40 mesh sieve, mixing of molasses adhesive, printing, drying and testing the characteristics of briquettes. The pyrolysis process takes 1 hour for the preparation of rice husks and 1.5 hours for the preparation of tea dregs with no or little air. The results showed that the best composition was TSM2 with a ratio of 30% tea dregs and 70% rice husks. The results of the study with the best composition, namely TSM2, caorific vaue 3771 ca/g, moisture content 9.28%, ash content 6.92%, density 1.16 g/cm3, kamba density 0.49 g/cm3, combustion rate 0.031 g/ s. TSM1 10% tea dregs charcoa and 90% rice husk charcoa caorific vaue 3399 ca/g, moisture content 8.94%, ash content 8.02%, density 1.51 g/cm3, kamba density 0.53 g/cm3, burning rate of 0.049 g/s and TSM3 50% tea dregs charcoa and 50% rice husk charcoa caorific vaue 4192 ca/g, moisture content 9.98%, ash content 6.85%, density 0.86 g/cm3, kamba density 0.43 g/cm3, the combustion rate is 0.025 g/s.

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