Judul: Model Turunan Terbatas untuk Pendugaan Laju Pembekuan Daging Sapi
Abstrak: Skripsi ini disusun berdasarkan penelitian yang dilakukan di PT Abattoir Surya Jaya, Surabaya. Penelitian dilaksanakan pada tanggal 15 September sanpai 1 Oktober 1987. Tujuan penelitian ini adalah: 1) nenyusun program komputer model turunan terbatas untuk menduga laju penbekuan daging sapi dengan menggunakan "air-blast freezern dan 2) menguji ketepata-n model pendugaan terhadap hasil pengukuran.
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Judul: Pendugaan Model untuk Bobot Badan Sapi Bali Jantan
Abstrak: Pengukuran bobot badan ternak sapi sangat penting dan perlu untuk diketahui, karena bobot badan merupakan salah satu faktor penentu nilai dari ternak sapi tersebut. Cara yang paling akurat untuk meng$tahui bobot badan ternak dapat dilakukan dengan menimbang ternak secara langsung. Oleh karena sulitnya mendapatkan timbangan ternak terutama di daerah pedesaan, perlu cara lain untuk mengetahui bobot badan yaitu dengan cara pendugaan bobot badan ternak sapi melalui pendekatan hubungan antara satu atau lebih ukuran-ukuran tubuh ternak dengan bobot badannya. Data yang diainati adalah data dari Rumah Potong Hewan (RPH) Cakung DKI Jakarta. Data yang digunakan adalah data sekunder 133 ekor sapi bali jantan dari daerah peternakan Nusa Tenggara Timur dan Bali, yang terdiri dari 45 ekor kelompok umur 1,s - 2 tahun, 37 ekor kelompok umur 2 - 2,5 tahun, daii 51 ekor kelompok ulnur 2,s - 3 tahun. Model penduga bobot badan sapi bali jantan untuk kelompok umur 1,5 - 2 tahun adalah ? = 0,304 X,I.OZ1, keloinpok umur 2 - 2.5 tahun adalah ? = 0,720 XYm, sedangkan model penduga bobot badan sapi bali jantan untuk kelompok umur 2,5 - 3 tahun adalah ? = 1,440 X,0.999.
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Judul: Bioelectricity Production from Citrobacter freundii GBH253 and Chlorella pyrenoidosa on Microbial Fuel Cell Anode with Different Carbon Sources
Abstrak: Microbial Fuel Cell (MFC) development has significantly increased from various aspects to get higher and more stable electricity. Developing MFC on microorganism aspect is very important because it plays a crucial role in the MFC system. C. freundii GBH253 is one of the potential exoelectrogen bacterium that could be developed for the MFC system. Integrating C. freundii GBH253 and electricity-producing microalgae, such as C. pyrenoidosa, in the anode of MFC could get more stable and higher electricity. In this study, C. freundii GBH253 and C. pyrenoidosa were coupled to produce electricity from different substrates. C. freundii GBH253 and C. pyrenoidosa were tested on three different media types before being tested on MFC. They were also examined for the co-cultivation test to determine the symbiotic relationship between the two microorganisms. The MFC test was conducted using the Randomized Block Design Factorial and the Tukey test to see significant differences from each treatment. The parameters observed in this study were voltage, power density, Chemical Oxygen Demand (COD), Coulombic Efficiency (CE), pH, and volatile fatty acid (VFA). C. freundii GBH253 cannot grow on microalgae medium, while C. pyrenoidosa could grow on bacterial medium and a mixture of bacterium and microalgae media. The bacterium gained benefit from co-culture with microalgae. In the MFC test, electricity was generated in all treatments, which bacterium + microalgae with acetate treatment could generate power density up to 211,97 mW/m2 and the most stable compared to others. Production of electricity in bacterium-microalgae combination dominated by the bacterium; hence, microalgae still help bacterium by producing electricity and raised the COD value. The pH value of all treatments was higher than the initial pH. Acetate and phenol were VFA produced in all treatments, whereas butyric acid and propionic acid were found in some treatments. Pearson correlation showed that some VFA highly correlated with power density.
Keyword: Chlorella pyrenoidosa, Substrate, Microbial Fuel Cell, Electricity Producing Microalgae, Volatile Fatty Acid, Citrobacter freundii