The Metal Coating course in Unimed's Mechanical Engineering Education Department only uses learning media in the form of printed textbooks and there is no interactive media that can improve student competence in the affective and psychomotor domains. To increase student competency in metal plating courses, learning media in the form of interactive multimedia that has been validated for its quality is needed. This study aims to validate learning media in the form of interactive multimedia using the ADDIE development model. As for the three acquisitions of interactive multimedia validity, namely analysis of metal plating course requirements, determining learning objectives and designing interactive multimedia, as well as developing interactive multimedia involving several material experts, learning design experts, and learning media experts, as activity validators. Data collection techniques for interactive multimedia validation are carried out by distributing questionnaires. The validation assessment criteria used a Likert scale which was analyzed descriptively. The results showed that the validity of the material expert was 89.7% in the very good category, the learning design expert was 91.58% in the very good category and the learning media expert was 88.3% in the very good category. from these data it can be concluded that the use of interactive multimedia in the teaching and learning process in the metal plating course developed is very valid to be implemented in the teaching and learning process

This study focuses on the potential of biomass to be developed becomes charcoal briquette. Based on data from the Central Bureau of Statistics (North Sumatra Province), the planted area and total coconut production of North Sumatra Province in 2019 were 110,345 hectares and 99,132 tons. The objective of this research is to obtain the properties of charcoal briquettes by varying the composition and pressure. The variations of the briquette moulding pressure are 80 and 100 Bar with composition variations of 1:10 and 1:15, respectively. The experimental tests were carried out to obtain Young’s modulus and wt% of briquette. The results showed that the value of tensile strength and wt% of briquette depends on the moulding pressure and duration of drying. The conclusion of this study shows that coconut shell and durian skin waste are very likely to be used as a renewable alternative fuel energy source as briquette.

Indonesia kaya akan sumber bahan pangan. Namun, masih banyak bahan pangan yang belum dimanfaatkan potensinya secara maksimal. Salah satu bahan pangan tersebut adalah Singkong. Tanaman ini merupakan bahan baku yang paling potensial untuk diolah menjadi tepung, salah satunya adalah tepung mocaf. Permasalahan yang terjadi adalah pengolahan tepung mocaf yang diproduksi oleh mitra belum bisa dimanfaatkan secara maksimal. Hal ini disebabkan karena kurangnya pengetahuan dan keterampilan dalam mengolah makanan berbahan dasar tepung mocaf pada ibu-ibu di Desa Sumberejo, Kecamatan Pagar Merbau, Kabupaten Deli Serdang. Berdasarkan permasalahan tersebut, solusi yang dilakukan untuk menyelesaikan masalah adalah dengan memberikan pelatihan tentang ragam olahan makanan dari tepung mocaf serta pendampingan dalam praktek pembuatan produk makanan tersebut. Pelatihan dan pendampingan dilakukan untuk meningkatkan pengetahuan serta keterampilan dalam membuat berbagai olahan dari tepung mocaf. Metode yang digunakan dalam kegiatan pengabdian masyarakat ini adalah diskusi, wawancara, edukasi, pelatihan dan pendampingan melalui tahapan persiapan, pelaksanaan dan evaluasi. Kegiatan dilaksanakan pada bulan November tahun 2021. Hasil kegiatan pengabdian ini adalah meningkatnya pengetahuan masyarakat tentang pemanfaatan tepung mocaf dan kemampuan terkait bagaimana membuat berbagai produk makanan dari tepung mocaf yang memiliki nilai gizi dan nilai jual yang tinggi. Indonesia is rich in food sources. However, many foodstuffs still have not been utilized to their maximum potential. One of the foodstuffs that can be processed into food is sweet potatoes, or what we commonly call cassava. This plant is the most potential raw material to be processed into flour, one of which is mocaf flour. The problem is that the processing of mocaf flour produced by partners has not been utilized optimally. This is due to the lack of knowledge and skills in processing food based on mocaf flour in mothers in Sumberejo Village, Pagar Merbau District, Deli Serdang Regency. Based on these problems, the solution to solve the problem is to provide training on the variety of processed foods from mocaf flour and assistance in the practice of making these food products. Training and mentoring are carried out to improve knowledge and skills in making preparations from mocaf flour. The methods used in this community service activity are discussion, interview, education, training and mentoring through the stages of preparation, implementation and evaluation. The result of this activity is the increasing public knowledge about the utilization of mocaf flour and related abilities to make various food products from mocaf flour that have high nutritional value and selling value.

The production of coconut and durian means that it will produce a lot of waste from its shell. Indonesia is a country that produces a lot of them. The coconut shell (CS) and durian fruit peel (DFP) can be converted to briquette as new fuel from biomass.  The objective of this research is to obtain the calorific briquette properties of CS and DFP using Differential Scanning Calorimetry (DSC).  The material composition consist of 10 % and 15 % of starch for each CS and DFP. Thermal treatment was carried out in the temperature range of 28 °C to 600 °C at 5.4 °C/min. The addition of starch causes the heating temperature since it has thermoplastic properties. Additionally, it is difficult to burn and carries a lot of water so that the heat generated is used to evaporate the water first of all in the briquettes. The recommended material is CS with 10 % mass of starch. The optimum temperature reached was 578.97 °C with an enthalpy value of 0.42 J/g.

Dalam pembuatan material penyerap gelombang mikro diperlukan pengembangan material yang memiliki sifat dielektrik dan sifat magnetik agar material mampu berinteraksi dengan kedua medan gelombang mikro tersebut. Salah satu material yang banyak dikaji adalah paduan polimer konduktif dan ferrit, dimana penggunaan polimer konduktif sebagai komponen dielektrik dapat mengurangi refleksi gelombang mikro dan ferrit sebagai komponen magnetik menghasilkan rugi elektrik dan magnetik yang besar. Paduan dua komponen tersebut mampu menghasilkan material baru yang dapat meningkatkan sifat dielektrik dan sifat magnetik yang diharapkakan ada pada suatu material penyerap gelombang mikro. Pada penelitian ini diwakili oleh BaFe10.8Mn0.6Ti0.6O19–CoFe2O4 (BHFTM/CFO) sebagai material magnetik dan polianilin (PANi) sebagai polimer konduktif. Pada awal penelitian, dilakukan sintesa dan karakterisasi terhadap masing-masing komponen komposit yaitu matrik PANi dan material magnet BHFTM/CFO dengan komposisi 90/10. PANi yang digunakan merupakan hasil sintesa melalui metode polimerisasi oksidatif kimia menggunakan inisaitor Ammonium Peroksidisulfat (APS) dan monomer anilin dengan waktu polimerisasi 10 jam. Sedangkan untuk material magnetik BHFTM dan CFO masing-masing komponen disintesa melalui teknik pemaduan mekanik konvensional kemudian diolah dengan iradiasi ultrasonik untuk mendapatkan partikel nanokristalin. Komposit PANi/BHFTM/CFO disintesa dengan cara menambahkan material magnetik ke dalam matriks PANi kemudian dilakukan pengepresan dengan tekanan sebesar 5 ton selama 10 detik sebanyak 2 kali. Kemudian PANi/BHFTM/CFO diukur sifat absorpsi gelombang mikro menggunakan Vector Network Analyzer (VNA) pada rentang frekuensi Ku-band (10 – 15 GHz). Hasil pengukuran menunjukkan reflection loss (RL) maksimum pada komposit mencapai -19.99 dB pada 12,8 GHz dan – 19.08 dB pada 12.75 GHz. Hasil RL tersebut menunjukkan bahwa komposit dapat digunakan untuk aplikasi penyerap gelombang mikro di atas 8 GHz.