Judul: Pengaruh Pemberian Blast Furnace Slag, Electric Furnace Slag, Dolomit dan Silica Gel terhadap Sifat Kimia Tanah Gambut Dalam dari Desa Arang-Arang Jambi
Abstrak: Peat soil is soil having layers consisting high of organic materials (C-Organic > 18 %) whitin the thickness 50 cm or more. Organic materials of peat soil is formed by remnamt of decaying plants that have not been smashed perfecly because saturated water environmental conditions and low nutrient. Utilization of peat soil in agriculture is faced to several problems, especially chemical characteristic of the soil that is not supporting the growth of plants well. The characteristics are soil reaction which extremely acid, low base sarutation, very high cation exchange capacity and low nutrient balancing. Consequently, it is required improvements in chemical characteristic of soil such as application like steel slag. This research was purposed to investigate the effect of blast furnace slag (BF slag), electric furnace slag (EF slag), dolomite, and silica gel on chemical soil properties of peat soil and the availability of toxic heavy metal in the soil. This research was conducted by incubation experiment in laboratory using peat soil from Kumpeh, Jambi. Treatments applied were EF slag, BF slag 0 %, 2 %, 4 %, 6 %, and 8 %; dolomite and silica gel equivalent to EF slag 0 %, 2 %, 4 %, 6 %, and 8 %. The experimental design used was completely randomized design (CRD). The result of statistic analysis showed that BF slag, EF slag and dolomite significantly increased soil pH, and available Ca and Mg in the soil. The effect of treatments on available K and total N were not significant. EF and BF slag significantly increased available P in the soil, but dolomite and silica gel did not. EF slag treatment significantly increased available Fe in the soil, but BF slag, silica gel and dolomite did not. Dolomite and silica gel did not increase available Mn in the soil, but EF and BF slags significantly increased. Result of available Cu analysis indicated that among treatments only silica gel 8% increased available Cu in soil. EF slag and silica gel treatments increased Zn in the soil, but BF slag and dolomite treatment did not. EF and BF slags significantly increased available SiO2 in the soil, while dolomite and silica gel did not. The result of the heavy metal analysis showed that all treatments significantly reduced available Pb and Cr in the soil, but did not reduce available Cd and Hg in the soil.
Keyword: heavy metal levels., Nutrient level, Silica gel, Dolomite, Slag, Peat

Judul: Pengaruh Electric Furnace Slag, Silica gel dan Unsur Mikro terhadap Sifat Kimia Tanah Serta Pertumbuhan dan Produksi Tanaman Padi Sawah (Oryza sativa L.) pada Tanah Gambut dari Kumpeh, Jambi
Abstrak: The staple food of Indonesian is rice, concequently paddy is the most important crop in agriculture. Peat soil is one of marginal land which potential to create the availability of land for paddy in Indonesia. Generally, peat soil in Indonesia has low fertility and availability of silicon (Si). Silicon is beneficial element for paddy rice. Recently, general material used as sources of Si in some countries is steel slag of which consist calcium silicate. One kind of steel slag produced in Indonesia is electric furnace slag. However, according to regulation of government (PP No. 18, 1999 and No. 85, 1999), steel slag is categoried at hazardous waste. The objectives of this research were to determine the effect of EF slag, silica gel, and micro elements on chemical properties of soil, growth and yield of paddy rice on peat soil and to evaluate content of heavy metal in rice for worthiness of rice consumption. This research used peat soil from Kumpeh Regency, Jambi. The research consisted of two experiments, they were incubation experiment in laboratory and pot experiment in greenhouse. The dosage applied for treatment of EF slag and silica gel were 0%, 2%, 4%, 6%, and 8%. Application of EF slag significantly increased pH, exchangeable Ca and Mg, available-Fe, Mn, Zn, SiO2, and P. Growth and yield of paddy rice with EF slag was better than with silica gel and micro nutrients. Furthermore, the content of heavy metal in rice was very low, so that the rice produced is not harmful and can be consumed.
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