Judul: Konsistensi Respons pada Skala Kontinu
Abstrak: Dalam menilai suatu objek, umumnya seseorang menggunakan pengetahuan, pemahaman, dan pola pikir yang berbeda sesuai subjektivitas masingmasing individu. Hal ini menyebabkan respons setiap individu dapat berbeda-beda dalam menilai objek yang sama. Perbedaan respon juga disebabkan adanya perbedaan kemampuan individu dalam mentransformasi ide kualitatif ke kuantitatif. Disamping itu, dalam waktu yang berbeda, setiap individu umumnya memiliki basis yang berbeda-beda dalam menilai sesuatu objek, sehingga penilaian menjadi tidak konsisten. Penelitian ini bertujuan mengetahui tingkat konsistensi respons kontinu. Metode yang digunakan adalah perancangan percobaan yang melibatkan 200 responden, dimana setiap individu diberi tiga perlakuan yaitu objek A (kualitas tinggi), B (kualitas sedang), dan C (kualitas rendah). Pengukuran dilakukan berupa respon secara spontan dan struktural. Hasil penelitian menunjukkan bahwa respons struktural lebih konsisten dibandingkan respons spontan untuk semua kategori objek yang dinilai. Fakta ini membuktikan bahwa, seseorang akan relatif lebih konsisten dalam menilai suatu objek dengan menggunakan skala yang lebih terstruktur (skala rendah).
Keyword: konsistensi, respons spontan, respons struktural

Judul: Perbandingan Skala Kontinu dan Skala Diskret
Abstrak: In social studies, researchers often measure the characteristics of coutinuously measured objects by using discrete scales. So far the discrete scale are considered among the most popular methods used in the study because it is easy and simple. For this purpose, we need scale which can put respondents answers into a particular option, but has a relatively small bias. This study focused on the measurement of the magnitude of the bias arising from the multiple scale number associated with the number of samples, the distribution of the data and the correlation between variables. We than simulated using a continuous scale and then transformed into a discrete scale with six categories, namely scale 2 - 7. For each category, the magnitude of the sample size did not significantly affect the bias. The magnitude of the bias due to the categorization of the scale in this study indicates that the more categories used the smaller the bias. Category scale that has the smallest of bias was 7 with the average value of the bias 3.32%.
Keyword: bias., correlation, categories, Scale

Judul: Rancang Bangun Elemen Pemanas Bahan Bakar Minyak Nyamplung Untuk Motor Bakar Diesel dengan Memanfaatkan Panas Gas Buang
Abstrak: Tamanu oil is one of biosolar substituter as diesel engine fuel. High viscosity of tamanu oil becomes main obstacle in direct using of tamanu oil as diesel engine fuel. Heater element is made to decrease tamanu oil viscosity. Heater element is benefitted high temperature of diesel engine exhaust gas as reheating source. Optimum temperature which is needed to reduce tamanu oil viscosity of 3-5 cSt is 110 Celcius degree (biosolar viscosity of 30oC is 5-7 cSt). IV design of element heater has optimum tamanu oil reheating. There are four kind of tamanu oil that has different treatment. degumming neutralization (N4) tamanu oil has best quality with the lowest viscosity of 30cSt in 30oC. Tamanu oil (N4) usage as fuel occur reduction power of 12.26 %, torsion of 9.59 %, power maximum of diesel engine is 5.39 kW and maximum torsion of 123.74 Nm. Maximum power of diesel engine using biosolar is 5.99 kW and maximum torsion of 144.53 Nm. But then, tamanu oil can replace biosolar (fossil energy), without made as biodiesel first and mixed with biosolar.
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