Judul: Baggase as cibacron red reactive dye adsorbent.
Abstrak: Cibacron Red is one of reactive dye types which is widely used by textile industry. But, reactive dye waste from textile industrial process causes many environment problems. Lots of waste treatment efforts are conducted; one of which is to make use of agricultural side products that are potential to be utilized as adsorbent. This research utilizes baggase as Cibacron Red reactive dye adsorbent. Baggase was divided in two categories, unmodified adsorbent and concentrated-sulphuric-acid-modified adsorbent. As a comparison, activated carbon that originated from coconut shell, which is commercially-used adsorbent, was used. Adsorption was carried out by varying adsorption times, adsorbent weights, and initial concentrations of Cibacron Red reactive dye; where then the results were applied to textile industrial waste. The optimum adsorption time, adsorbent weight, and initial concentration for unmodified adsorbent were 45 minutes, 1 g, and 150 ppm, respectively. On the other hand, the optimum conditions for acid-modified adsorbent were 53.5 minutes, 2.5 g, and 150 ppm. The optimum conditions for activated carbon, as comparison, were 60 minutes, 3 gram, and 150 ppm. In single solution tests of Cibacron Red, adsorption capacity for unmodified adsorbent, acid-modified adsorbent, and activated carbon were 788.7, 5669.6, dan 3827.5 μg/g adsorbent; with adsorption efficiency were 6.2, 94.1, dan 75.6% correspondingly. Application of three types of adsorbent toward textile industrial waste showed adsorption efficiency were 1.3, 97.6, and 51.7% in that order. Isotherm type for all types of adsorbent followed Freundlich isotherm.
Keyword: 

Judul: Adsorpsi Cibacron Red Menggunakan Campuran Kaolin Ampas Tebu dan Bentonit-Ampas Tebu
Abstrak: The use of agroindustrial waste and clay mineral have been studied as alternative adsorbents for dyes, such as Cibacron Red. Cibacron Red is one of reactive dyes which is widely used in textile industries In this research, the mixture of sugarcane bagasse and kaolinite or bentonite were used as adsorbents for cibacron red. Acid and base treatments were carried out to activate the adsorbents. Adsorption was carried out by varying adsorption times and adsorbent weights. The result showed that acid activated bagasse had the highest adsorption capacity. The optimum adsorption time and adsorbent weight were 120 minutes and 1 g with decrease of concentration from 50 mg/L to 7.99 mg/L. On the other hand, the optimum conditions for commercially activated carbon were 90 minutes and 1 g with decrease of concentration from 50 mg/L to 16.18 mg/L. The adsorption capacity and efficiency for acid activated bagasse was better than the commercially activated carbon. The adsorption capacity for acid activated bagasse and activated carbon were 2.10 mg/g and 1.69 mg/g adsorbent. The adsorption efficiency were 84.00% and 67.64%. Acid activated bagasse were followed Freundlich and Langmuir isotherm type, it was mean that adsorbent type is fisisorption and chemisorption.
Keyword: 

Judul: Konstruksi aritmetika kurva eliptik F(2m) supersingular dan non-supersingular untuk skema kunci publik ElGamal
Abstrak: Algoritme ElGamal adalah salah satu algoritme kunci publik dengan aritmetik modular p yang mempunyai struktur grip siklik Z(p). Tingkat keanaman algoritme ini terletak pada pemecahan masalah logaritme diskret dari Z(p). Akan tetapi, tingkat keamanan tadi tahun ke tahun semakin menurun yang disebabkan kemampuan pemecahan algoritme diskret semakin meningkat. Untuk memenuhi tingkat keamanan yang memadai dibutuhkan p yang cukup besar yang menyebabkan proses enkripsi dan dekripsi menjadi lambat.
Keyword: