Judul: Kajian Pengeringan Gabah yang Menggunakan Sistem Kendali Udara Lingkungan dan Penjemuran
Abstrak: Penerapan sistem kendali untuk pengeringan jagung pipilan menggunakan udara lingkungan telah dirancang sebelumnya oleh Thaariq (2013). Pada penelitian ini, sistem kendali tersebut diterapkan untuk pengeringan gabah dengan melakukan penyesuaian konstanta persamaan Henderson. Selanjutnya, metode pengeringan tersebut dibandingkan dengan metode penjemuran pada ketebalan 1 cm dan 3 cm. Hasil percobaan menunjukan bahwa sistem pengeringan udara lingkungan dengan suhu rata-rata gabah mencapai 31,10 °C, dapat mengeringkan gabah dari kadar air awal rata-rata 24,62 % b.b hingga kadar air akhir rata-rata 13,99% b.b selama 25,5 jam pada suhu lingkungan rata-rata 34,40 °C dan RH rata-rata 66,28 %. Sedangkan pada metode penjemuran dengan suhu rata-rata gabah mencapai 47,8 °C memerlukan waktu pengeringan selama 5,5 jam pada suhu lingkungan rata-rata 36,40 °C dan RH rata-rata 60,40%. Energi listrik yang digunakan pada pengeringan dengan metode sistem kendali udara lingkungan adalah sebesar 3,28 kWh dan energi panas yang digunakan pada metode penjemuran adalah sebesar 3,68 kWh. Presentase beras kepala yang dihasilkan pada pengeringan udara lingkungan lebih tinggi dibandingkan pada pengeringan penjemuran…
Keyword: Drying, Grain, Ambient Air Control System, Drying metode, Continous drying, Batch drying, Pressure drop, Water content

Judul: Strategi Pengendalian Pengeringan Jagung Pipil dengan Kadar Air Tinggi yang memanfaatkan Udara Lingkungan
Abstrak: A bed dryer model has been designed and constructed to study control stategy of ambient drying for high moisture content shelled corn. The control strategy developed in this research was based on the diference of moisture content and the moisture content equivalent of ambient air. The action of the control system was the rotational speed of fan regularity to control the air flow rate. The result showed that with at initial moisture content of corn 20% w.b to the final moisture content of 13.61% w.b. drying were accomplided in 69.5 hours and fan turn on for 20.5 hours with the condition rated highest temperature recorded during the drying process is 37.5oC, and thelowest temperature was 28.5C. Average temperature was 29.15oC, and also was obtained that the highest environtmental RH recorded was 94.8% and the lowest RH was 52.4% RH environmental so that the average was 82.83%, and consumed electrical energy around 4.25 kWh or 15.3 Megajoules. From that equation, assumed energy consumption per kilograms of water evaporated was 4.37 MJ. From the above result the controller system in this dryer is working properly as per design.
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Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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