Judul: Metode Kendali Mutu Etilena Vinil Asetat dengan Teknik Spektroskopi dan Kemometrik
Abstrak: In this study, principal component analysis was used to separate standard and non-standard ethylene vinyl acetate (EVA) based on the infrared spectra, whereas partial least square was used to create sample group’s prediction models. Preprocessing step was performed on the IR spectrum to ensure the best prediction for measurement. The best grouping for water-based EVA was obtained by using the before-manipulation model, which showed the variation value of 96% (PC1 = 84%, PC2 = 12%), whereas for hotmelt EVA, the best grouping was obtained by using the normalization before-manipulation model, showing the variation value of 96% (PC1 = 90%, PC2 = 6%). The best prediction model for both water-based and hotmelt EVA was obtained by using the beforemanipulation model with the r calibration of 0.9801 and 0.9402, r validation of 0.9431 and 0.8414, RMSEC of 0.0694 and 0.0992, RMSEP of 0.1223 and 0.1627, SEC of 0.0702 and 0.0997, SEP of 0.1236 and 0.1634, calibration bias of -3.663 × 10-8 and 2.577 × 10-8, and validation bias of -0.0011 and -0.0067, respectively. Based on these results, this alternative spectroscopic and chemometric-based quality control method can be applied for both water-based and hotmelt materials and can improve the simplicity and practicality of quality control process.
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Judul: Pervaporasi Metanol Menggunakan Membran Selulosa Asetat/Polivinil Pirolidon dan Natrium Dosesil Sulfat
Abstrak: Pervaporation membrane is one of alternative methods to purify methanol. Performance of the pervaporation is affected by its characteristics. Phase inversion technique was used for preparing the membrane. The membrane was prepared by mixing polymeric solution of cellulose acetate (CA) and sodium dodecyl sulfate (SDS) as template in acetone solution. Composition of CA was 17% w/v and composition of SDS were varied 0; 0.5; 1; 1.5; dan 2% w/v. The solution was stirred by ultrasonic for 10 and 20 hours and it was casted on the glass plate surface and then submerged it into water of 60 oC. The membrane was coated by polyvinyl pyrrolidon. The performance of pervaporation was evaluated through permeation flux and separation factor and then was calculated for its pervaporation separation index (PSI) value. In this research, permeation flux and separation factor were contradicted results, but PSI was proportional to the separation factor. High permeation flux and separation factor are desired in the performance of pervaporation. The results showed that methanol concentration from pervaporation product by CA membrane with SDS 2% b/v in 20 hours stirring by ultrasonic was 79% from feed solution of 60%. Therefore, this membrane is applicable for methanol pervaporation, but it still needs some improvements.
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Judul: Ornithonyssus Bursa (Berlese, 1888) Famili Macronyssidae yang Menyerang Unggas Dan Penaggulangannnya
Abstrak: Ornithonyssus bursa adalah tungau penghisap darah pada unggas di daerah tropis dan subtropis. Tungau ini relatif kecil, dengan panjang tubuh antara 700-1000 mikron dan lebarnya 250-490 mikron. Tubuhnya bulat berwarna coklat kekuningan sebelum menghisap darh dan berwarna merah setelah menghisap darah dari induk semangnya.
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