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 nilai F/M (Food to Microorganism ratio) kolam lumpur aktif pada efesiensi penyisihan polutan organik dalam instalasi pengolahan air limbah industri tepung agar-agar
Abstrak: Seaweed is one of the commodities that are potential to develop, and from the data in the last 5 years, seaweed production in Indonesia reached 2.6 million tons per year valued Rp. 18 billions. One way to add value to seaweed is to process it to become agar powder. Despite of the positive impact to economy, agar powder industries also give negative impact emerges form those activities which is the waste water. The objectives of this research were to study the effects of F/M (Food to Microorganism) ratio of waste water treatment in agar powder industry, and to determine the optimum F/M ratio of activated sludge process to waste water treatment plant (WWTP) of agar powder industry. The initial research was done to characterize the waste, including COD and TKN analysis (Total Kjeldahl Nitrogen). In order to determine the parameter of F/M ratio, the sampling were done in five level of resistance time treatments, which were HRT 2.5 days, HRT 2 days, HRT 1.5 days, HRT 1 day, HRT 0.5 day in F/M ratio of 0.5; 0.4; 0.3; 0.2; and 0.1. The treatment of hydraulic resistance time led to the difference in COD removal values. The F/M ratio used in waste water treatment plant (WWTP) was the best ratio, which were 0.2 and 0.3. The efficiency of COD removal of F/M ratio 0.2 in resistance time HRT 2.5 days was 77.91 % while F/M ratio 0.3 in resistance time HRT 2.5 gave the efficiency of COD removal as much as 69.17 %. It showed the most efficient removal in agar powder’s waste water treatment was in F/M ratio of 0.2 with HRT of 2.5 days which was 77.91%. According to COD quality standard, the removal value in 0.2 F/M ratio and 2.5 days HRT met the existing standard.
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