Judul: Vigor Of Lime Seed (Citrus Amblycarpa Hassk. Ohcse) On Saline And Drought Conditions
Abstrak: Lime is cultivated in many countries as food ingredient, food fragrances, flavorings and face cleaner. The crop is propagated by seeds generatively or by grafting vegetatively. There are limited information available on lime’s seed vigor in stress conditions. The research was consist of two experiment, i.e. saline and drought conditions. The experiment was conducted at the Laboratory of Seed Science and Technology IPB from March to July 2015. The objective of this research was to provide information related to vigor of lime seed in saline and drought conditions. First experiment was tested the vigor of lime seeds in different saline conditions by using NaCl, i.e. 0 ppm, 1500 ppm, 3000 ppm and 4500 ppm. Second experiment tested the vigor of lime seeds in different drought conditions using PEG 6000 at 0 bar, -0.75 bar, -1.5 bar and -2.25 bar. The experiment elucidated that saline and drought conditions significantly decreased germination percentage, vigor index and dry weight of normal seedling. The higher the concentration of NaCl (salinity condition) or PEG 6000 (drought condition), the smaller the germination percentage of lime seeds.
Keyword: drought, lime seed, saline, vigor

Judul: Vigor daya simpan dan vigor kekuatan tumbuh benih pada beberapa genotipe cabai (Capsicum annuum L.)
Abstrak: Chili peppers (Capsicum annuum L.) is one of commercial vegetables which has high economic value in Indonesia. The research was aimed to study the storability period and vigor of nine genotypes of chili pepper seeds through salinity stress and drought stress. The experiment of accelarated aging was using chemical method through methanol (20%) soak period i.e 1, 2 and 3 hour. The genotype number 307 (Bhaskara F1) has highest storability (VDS) based on dry weight of normal seedlings (BKKN) 3.99 mg, 2.77 mg and 1.29 mg, germination percentage (DB) 7.45%, 4.67% and 2.08%, speed of germination (KCT) 3.17% etmal-1, 1.93% etmal-1 and 1.14% etmal-1, and seedling growth rate (LPK) 1.32 mg, 1.54 mg and 1.20 mg. The experiment of sub optimum condition through salinity stress was using NaCl concentration treatment that is 2500, 3750 and 5000 ppm. The genotype number 293 (SKB 27) was elucidated as the most tolerant genotypes to salinity stress through dry weight of normal seedlings 5.15 mg, 5.06 mg and 4.67 mg, germination percentage 68.52%, 57.58% and 53.94%, speed of germination 16.60% etmal-1, 14.30% etmal-1 and 14.00% etmal-1, and seedling growth rate 1.48 mg, 1.54 mg and 1.47 mg. Experiments vigor chilli pepper seeds to drought stress was using PEG 6000 at -1.0, -1.5 and -2.0 bar. The genotype number 307 (Bhaskara F1) was elucidated as the most resistance genotypes to drought stress through dry weight of normal seedlings 5.07 mg, 5.02 mg and 4.69 mg, germination percentage 60.84%, 60.81% and 56.59%, speed of germination 16.04% etmal-1, 15.13% etmal-1 and 13.88% etmal-1, seedling growth rate 1.52 mg, 1.51 mg and 1.49 mg and the length of radicle (PR) 2.20 cm, 1.46 cm and 1.81 cm.
Keyword: vigor, salinity, rapid, drought, chili, Bogor Agricultural University (IPB)

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