Judul: Pengaruh Penambahan Zat Higroskopis terhadap Kualitas dan Daya Simpan Ampas Rumput Laut sebagai Bahan Pakan.
Abstrak: This research aimed to observed the effect of hygroscopic substances’s addition such as Zeolite, Dolomite and Bentoniteintoseaweed waste which was a waste from the production of agar-agar PT Agar Swallow that were assessed contaminate the surrounding environment and expected to be materialfeed which is always available. This research was carried out for 3 months to see the physical properties, chemical propertiesandlength storage of seaweed waste with the addition of 5% hygroscopic substances. The experimental design was CRD (4x3) with factor A were P0: seaweed waste without the provision of hygroscopic substances, P1: seaweed waste with 5% Zeolite, P2: seaweed waste with 5% Dolomite and P3: seaweed waste with 5% Bentonite, factor B was storage times (0, 1, 2 weeks) with three repetitions. The results showed that the addition of 5% zeolite significantly affect (p<0.05) on decreasing of moisture contentcomparedto the control. The addition of hygroscopic could increase the quality of seaweed waste however did not significantly affect on decreasing the water content during storage.
Keyword: bentonite, dolomite, seaweed waste, zeolite

Judul: Pengaruh Konsentrasi Natrium Tripolifosfat (STP) Terhadap Rendemen dan Mutu Tepung Agar-agar dari Rumput Laut Gracilaria verrucosa
Abstrak: Seaweed is one of the plants, including Thallopyta Division is containing polysaccharides that are not found in other plants, and it is available in large quantities. The purpose of this study was to use seaweed as a compactor on plant tissue culture media using sodium tripolyposphat as raw material on extraction agar powder. The study was conducted in two stages. A preliminary research was conducted to determine the chemical composition of raw materials, as well as to find the apropriate tripolyposphat sodium concentration that will be used in the main research. Primary research was conducted to look for extraction time and apropiate water added to the extraction process. Parameters that observed in the agar powder production is yield and gel strength. The results showed that Sodium Tripoliphosphate has significant effect on the extraction process toward gell strength, and extraction time. Water added has influence on yield significant toward agar powder.
Keyword: 

Judul: Invers dari Matriks Tridiagonal Jacobi
Abstrak: Suatu matriks berukuran n×n dinamakan matriks tridiagonal jika untuk . Karya ilmiah ini memberikan algoritma yang mudah untuk menemukan invers ( dari matriks tridiagonal Jacobi yang simetrik dan nonsimetrik. Setiap elemen pada matriks tridiagonal ini adalah bilangan real. Terdapat 3 lema dan 2 teorema untuk menentukan . Lema pertama menunjukkan persamaan utama dalam membuktikan lema-lema dan teorema-teorema selanjutnya. Invers dari matriks yang simetrik dibuktikan oleh lema kedua yang menunjukkan elemen-elemen baris ke- dari . Selanjutnya, lema kedua dilengkapi dengan teorema pertama yang menunjukkan elemen-elemen dengan . Invers dari matriks yang nonsimetrik dibuktikan oleh lema ketiga yang menunjukkan elemen-elemen dengan dan elemen-elemen dengan dibuktikankan oleh teorema kedua.
Keyword: symmetric, nonsymmetric, matrix