No abstract

Kebijakan diversifikasi energi yang dikeluarkan Pemerintah Indonesia menuntut masyarakat untuk menemukan bahan bakar selain fosil. Penelitian ini bertujuan untuk menghasilkan briket dari campuran arang limbah baglog jamur tiram (JT) dan arang sekam padi (SK) yang berkualitas sehingga dapat digunakan sebagai bahan bakar alternatif. Penelitian ini secara garis besar dilakukan dalam tiga tahap yaitu pengarangan atau karbonisasi, pembriketan dan pengujian kualitas briket. Variabel yang digunakan dalam penelitian ini adalah komposisi campuran JT dan SK. Komposisi campuran yang digunakan yaitu 100% JT:0% SK untuk sampel A, 75% JT:25% SK untuk sampel B, 50% JT:50% SK untuk sampel C, 25% JT:75% SK untuk sampel D dan 0% JT:100% SK untuk sampel E. Dari hasil penelitian disimpulkan bahwa campuran yang paling optimal untuk mendapatkan briket berkualitas baik yaitu dengan komposisi 50% arang limbah baglog jamur tiram : 50% arang sekam padi dimana diperoleh nilai kalor sebesar 3541 kal/gr, kadar air 1.57% dan kadar abu 36.20%.

<p>It has been done, the research which aims to develop a web-based teaching materials on the subjects of physics subject with subject mater of temperature and heat. This study using a modified model of the 4D development by eliminating the deployment phase. The validation of product development conducted by validator media experts and experts matter of physics, whereas small-scale trials conducted by physics teacher and 10 students. Validator review results stating that the quality of the product development were included in the category very well with the average percentage rating of 83.93%. The percentage value assigned by media expert by 75% in the good category and the percentage of the value provided by a matter expert 92.85% were in the very good category. Experiments by physics teacher to obtain result of equal to 94.44% were in the very good category and the average percentage of the test results by the students of 90.5% were in the very good category. The characteristics of the products developed include material composition using the curriculum in 2013, there was a recording facility and the results of evaluation of students' activities, there were feedback evaluation results were immediately known by the students and there were some links related to the material either youtube or other learning website.</p>

This research aims to determine the types of grasshoppers and the diversity index of maize Zea mays L.) agroecosystems in Karanggayam district. This research was conducted using a field survey method. The parameters observed at each location included vegetation diversity, grasshopper collection and direct observation of orthoptera locusts. Samples were taken from the Zea mays L. agroecosystem and repeated three times. The study was conducted in June -August 2019. The results of this study were found as many as 346 individuals, four species consisting of Valanga nigricornis (Burmeister), Gesunola mundane (Walker), Atractomorpha crenulata, and Oxya hyla intricate (Stal). Three genera consisting of Valanga, Gesunola, and Oxya belong to the Acrididae family, while one genus, namely Atractomorpha, is included in the Pyrgomorphidae family. Shannon-Weiner (H') insect diversity index at station 1 is 1.124 (moderate), station 2 of 0.979 (low), station 3 of 0.449 (low), station 4 of 1.213 (moderate), station 5 of 0.884 (low) and station 6 of 1.035 (moderate).