One way to reduce the value of grounding resistance is to replace the electrodes’ backfill material with other materials such as; gypsum, charcoal powder, and bentonite. In this paper we report the use of zeolite powder as a backfill material to bury the electrodes of the grounding system. The purpose of this research is to compare zeolite and pure soil to be used as a backfill material. The type of electrode used is a single rod electrode. The parameters measured were grounding resistance, rain intensity, moisture and pH of the backfill material. Measurements were taken every day for 30 days. It was found that zeolite as a backfill material is better than pure soil which is often used so far. It is seen that the resistance value of grounding system using rod that buried in zeolite as a backfill material is lower than a half of the resistance value of grounding system when using pure soil as a backfill material. From this research it was also found that the moisture of the backfill material was higher by using zeolite than pure soil.
The background of this study is to reduce and reuse agricultural waste, specifically rice husk and rice straw waste. This research aimed to determine the sound absorption coefficient / noise absorption coefficient (NAC) of a composite material made of rice husk and rice straw so that it can be used as an alternative acoustic material. Rice husk and straw were processed into composite materials using a polyester matrix with a volume fraction of 30:70 and sample thickness variations of 25 mm and 40 mm. In addition to treating variations in sample thickness, samples were made with different cavity holes diameter variations, including flat (without cavity holes), 3 mm, and 4 mm with 10 mm cavity depth. Samples were tested using a type 4206 impedance tube with two microphones according to the ASTM E1050 standard in the 200 – 1600 Hz frequency range. According to the findings of this study, the maximum sound absorption coefficient value of the rice straw composite material is obtained from samples with a thickness variation of 40 mm and a cavity diameter of 3 mm, with α value of 0.87 at a high frequency of 1,600 Hz. Meanwhile, the rice husk composite material's maximum sound absorption coefficient value was obtained from samples with a thickness variation of 40 mm and a cavity diameter of 3 mm with α value of 0.65 at a low frequency of 400 Hz. According to the findings of this study, rice straw composite material and rice husk composite material have different properties as sound absorbing materials and can be used as acoustic materials in a specific frequency range.
Tanaman jagung merupakan salah satu tanaman penting di Lampung. Banyaknya permintaan jagung tidak sesuai dengan ketersediaanjagung saat ini karena jumlah produksi yang rendah. Sistem budidaya yang buruk membuat produksinya rendah yang dipengaruhi oleh proses pengolahan tanah sehingga terjadi kerusakan tanah. Salah satu cara mempertahankan produktivitas tanah yaitu dengan memodifikasi cara olah tanah dan intensitas pengolahan tanah. Penelitian ini bertujuan untuk Mempelajari pengaruh dua sistem pengolahan tanah pada pertanaman jagung (Zea mays L.), pengaruh aplikasi herbisida terhadap respirasi tanah pada pertanaman jagung (Zea mays L.) dan pengaruh interaksi antara sistem olah tanah dan aplikasi herbisida terhadap respirasi tanah pada pertanaman jagung (Zea mays L.) pertanaman ke-5. Penelitian dilakukan di Lab Lap Terpadu Universitas Lampung. Rancangan yang digunakan pada penelitian adalah Rancangan Acak Kelompok faktorial dengan dua faktor yang terdiri dari sistem olah tanah dan aplikasi herbisida. Data dianalisis dengan sidik ragam pada taraf 5% yang diuji homogenitas ragamnya dahulu dengan Uji Bartlett dan adivitasnya diuji dengan Uji Tukey. Rata-rata nilai tengah dari data diuji dengan uji BNT pada taraf 5%. Hubungan antara pH, suhutanah, C-organik, kadar air dengan respirasi tanah diketahui dengan uji korelasi. Hasil penelitian menunjukkan Perlakuan sistem olah tanah tidak berpengaruh nyata terhadap respirasi tanah pada semua fase pengamatan. Perlakuan aplikasi herbisida berpengaruh nyata terhadap respirasi tanah pada pengamatan fase generatif, tetapi tidak pada pengamatan sebelum olah tanah, setelah olah tanah dan fase vegetatif. Tidak terdapat interaksi antara dua sistem olah tanah dan aplikasi herbisida terhadap respirasi tanah pada semua fase pengamatan.
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