Judul: Uji Kinerja Pemanfaatan Membran Reverse Osmosis pada Mesin Pendingin Absorpsi LiBr-H20
Abstrak: Absorption refrigeration system LiBr-H2O is an alternative refrigeration system to substitute vapor-compression refrigeration system, which has negative impact to environment and using mechanical energy for its operation. However, the absoption refrigeration system still needs thermal energy to regenerate the refrigerant from its absorber. The purposes of this study is to study the performance of reverse osmosis membrane to regenerate refrigerant H2O from the LiBr-H2O in absorption refrigeration system and to calculate the COP of the system. The experiment was conducted intermittently, where regeneration and refrigeration process occured separately. The study uses 3 level of LiBr-H2O concentration, namely 30%, 25%, and 20% with a variety of pressure treatments. The result of this research shows that COP of the system at concentration of 30% was 0.130 – 0.270, at concentration of 25% was 0.035 – 0.055, and at concentration of 20% was 0.015 – 0.020
Keyword: 

Judul: Studying rate of absorption steam by solutions Lithium Bromide (LiBr) as absorbant in absorption refrigeration
Abstrak: Absorption is the process of absorbing a fluid by another fluid to form a fluid solution. In absorption refrigeration system, LiBr as absorbent filters on components of the absorber will absorb water vapor with lower pressure than the evaporator pressure. The rate of absorption of water vapor is a function of concentration, temperature, humidity and pressure of water vapor. The goal of this research is to see the effect of concentration, temperature and vapor pressure of water at the rate of absorption of water vapor by aqueous absorbent filters (LiBr-H2O) in relation to the cooling system, to determine the equilibrium concentration absorption solution of LiBr-H2O, and to determine the sorption isotherm model. Equilibrium concentration is a function of temperature and humidity. Ce at 40oC and RH 60% was found 37%; at 40oC and RH 70% was 34%; at 40o and RH 80% was 29%; at 45oC and RH 60% was 37.5%; at 45oC and RH 70% was 36%; and at 45oC and RH 80% was 34.5%. The calculation results of Qe using Qe sorption isotherm model on temperature 40oC and 45oC were not too different. The calculation results of the percentage errors between Qe data and model from each of the humidity, obtained the lowest percentage of errors in model Freundlich was 0.4% in RH 60% and 70%; 0.3% in RH 80%.
Keyword: 

Judul: Karakteristik Anatomi Skelet Tubuh Badak Jawa (Rhinoceros Sondaicus).
Abstrak: Badak jawa (Rhinoceros sondaicus) merupakan spesies mamalia besar di dunia yang paling terancam punah dan hanya dapat ditemukan di Taman Nasional Ujung Kulon (TNUK), Provinsi Banten, Indonesia. Tujuan dari penelitian ini adalah mempelajari karakteristik spesifik anatomi skelet tubuh badak jawa. Struktur skelet ini dikaitkan dengan fungsinya untuk menunjang ukuran tubuh yang besar dan perilakunya. Penelitian ini menggunakan satu set preparat skelet tubuh badak jawa. Parameter penelitian yang dilakukan adalah mengamati bentuk bagian skelet yang khas, mengukur panjang dan lebar tulang, serta dibandingkan dengan skelet tubuh badak sumatra dan hewan piara lain. Kemudian, sistem penamaan pada setiap bagian tulang dilakukan berdasarkan Nomina Anatomica Veterinaria (ICVGAN 2012). Karakteristik anatomi skelet tubuh badak jawa relatif mirip pada badak sumatera, tetapi memiliki ukuran yang lebih besar. Terdapat beberapa perbedaan yang ditemukan yaitu, ala atlantis lebih panjang, processus spinosus os axis berbentuk segiempat, processus transversus et spinosus tulang leher lebih subur, processus spinosus os vertebrae thoracicae relatif lebih mengarah ke kaudodorsal terutama pada sembilan ossa vertebrae thoracicae di kranial, daerah flank lebih sempit, dan ossa sacrales yang tersusun lebih kompak dan rigid. Secara umum skelet tubuh badak jawa memiliki hubungan yang sangat erat, kokoh, dan kompak, disertai penjuluran-penjuluran dan aspek kasar sebagai tempat melekatnya otot-otot dan ligamenta dengan kuat. Hal ini berperan dalam mempertahankan rigiditas dan menjaga sikap tubuh badak jawa terkait dengan habitat dan perilakunya.
Keyword: anatomi, badak jawa, skelet tubuh