Judul: Pendekatan Model Fuzzy untuk Pendugaan Bobot Badan Kerbau Lumpur Berdasarkan Lingkar Dada dan Panjang Badan
Abstrak: Body weight of a swamp buffalo can be determined by measuring the buffalo weight directly or indirectly. Measuring the buffalo weight directly is relatively difficult. Measuring the weight indirectly can be performed using a conventional formula or fuzzy model. In this paper, a fuzzy model is used to estimate the body weight of a swamp buffalo, then the result is compared with the result of calculation using four conventional formulas. There are some steps being taken on deriving the fuzzy model, namely fuzzification, application of implication function, composition of rules, and defuzzification. Inputs used in this fuzzy model are the chest circumference and the body length. The output of this model is the body weight. The accuracy of estimation based on conventional formula and fuzzy model is compared by using mean absolute percentage error (MAPE). Based on the value of MAPE, it can be concluded that the fuzzy model is relatively better than the first three of conventional formulas, but it is not better than the fourth formula.
Keyword: MAPE, fuzzy model, swamp buffalo

Judul: Aplikasi Ukuran Linier Tubuh Sebagai Penduga Bobot Badan pada Kerbau Rawa.
Abstrak: Penelitian ini bertujuan untuk memprediksi bobot badan kerbau rawa melalui ukuran linier tubuh. Tinggi badan (TB), tinggi pinggul (TP), lingkar dada (LiD), lebar dada (LD), dalam dada (DD), lebar pinggul (LP), panjang kelangkang (PK), lebar kelangka (LK), panjang badan (PB) diukur dalam satuan cm menggunakan pita ukur, penggaris 1 m dan tongkat ukur, sedangkan bobot badan ditentukan dalam kg dengan menggunakan timbangan 2 ton. Perbandingan rataan ukuran tubuh antara kerbau jantan dan betina dianalisis melalui analisis uji-t. Hubungan antar variabel ukuran linier kerbau dianalisis melalui analisis korelasi. Pendugaan bobot badan diestimasi melalui analisis regresi best subset, linier dan linier ganda. Hasil analisis uji-t menunjukan kerbau jantan dan betina memiliki perbedaan yang nyata pada lingkar dada, tinggi pinggul, dan panjang badan. Pendugaan bobot badan pada kerbau rawa dapat diestimasi melalui regresi linier ganda dengan variabel penduga lingkar dada dan tinggi pinggul. Hal tersebut dapat disimpulkan bahwa bobot badan kerbau dapat diduga menggunakan rumus regressi linier ganda, BB = 3.6435LiD + 0.1208TP - 265.43 untuk kerbau rawa jantan dan BB = 4.1783LiD – 0.3086TP – 305.19 untuk kerbau rawa betina.
Keyword: koefisien korelasi, ukuran linier tubuh, kerbau rawa

Judul: Pembuatan Sel Fotoelektrokimia Padat dengan Struktur ITO/CdS/Elektrolit/ITO
Abstrak: photoelectrochemical solid cell in ITO/CdS/Electrolyte/ITO structure has been succesfully composed through this research. The photoelectrochemical cell material is a layer of cadmium sulfide deposited onto an ITO-covering glass substrate. The CdS layer is used as a working electrode of the cell. The solid electrolyte used is a combination of chitosan-PEG-KI/I2. The concentration of KI/I2 was varied from 0.1/0.01 M to 0.5/0.05 M. The current-voltage output of the cell was measured under a light illumination of a tungsten lamp and the sun. The output voltage found increases around 50% when the KI/I2 consentration was raised from 0.1/0.01 M to 0.5/0.05 M. When the radiation intensity increased from 1.074 mW/m2 to 4.147 mW/m2, Voc voltage increased around threefold, Isc current increased around twice, and power efficiency increased around twice at a fixed concentration. The highest efficiency of the solar cells (on singlecell measurements) obtained at the concentrations of 0.5/0.05 M KI/I2. In a circuit consist of 4 solar cells, the highest power eficiency and FF produced by the serial circuit.
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