Judul: Pemanfaatan Limbah Tebu sebagai Bahan Briket Arang
Abstrak: The potentially biomass waste of sugarcane as an alternative energy is abundance but has not fully processed. This research propose on the processing of sugarcane waste as an alternative energy such as carbon briquettes. Carbonazation is done by using a modified drum furnace. The obtained carbon was then milled into a powder form, filtered using a 80 mesh sieve and the carbon that passes from the filter is mixed with tapioca adhesive levels of 2.5% and 5%. The raw materials manually compressed using a hydraulic system at a pressure of 20 tons, then dried in an oven at 70 C for 48 hours. Carbon briquettes produced in general result in physical properties are better than the raw one. Water content ranges from 0.475, ash content of 9.164 %, levels of substance evaporates 15.440 %, bonded carbon content 75.395 %, density, firmness press 82.04 kg/ and calorific value 6219 cal / gram. The addition of starch adhesives will affects the quality of carbon briquettes in physical and chemical properties. Carbon briquette with good quality found on the additional adhesive with a concentration of 5%.
Keyword: Bogor Agricultural University (IPB), sugarcane waste., heat value, compressive strength, Carbon briquettes

Judul: Pembuatan Briket Arang Dari Campuran Kulit Kacang, Cabang Dan Ranting Pohon Sengon Serta Sebetan Bambu
Abstrak: Introduction. One of waste utilization or organic garbage is as raw material of charcoal briquette. Charcoal Briquette can support energy need of human. Charcoal Briquette can be made by material which contain lignin and cellulose like waste or organic garbage where can be got in human life like nutshell waste, logging waste of tree of sengon which has branches and sticks, and also waste of bamboo slice. Making charcoal briquette which comes from waste or organic garbage can be alternative solution for solving garbage and can be new alternative sources of energy. Method. Making charcoal briquette is prepared raw material at first. It is continued by processing combustion with kiln drum (temperature at 500oC-1000oC). Next, it uses crashing and buffering charcoal (filter at 35 meshs) to become dust which has charcoal size of 35 meshs or more. Making starch glue (5% derived from charcoal weight) is mixing and cooking tapioca flour with water (1:12). Charcoal Dust is mixed with starch glue and it will be printed by pressure at ± 9 tons to become charcoal briquette. Then, briquette is tested physical in properties (water content, density and pressure stability) and chemical characteristic ( ash content, volatile matter content, content of bounded carbon, calorie value). Result and Discussion. Result of test in physical and chemical properties of charcoal briquette showed water content average of 1,57%-2,18%, ash content of 10,92%- 15,09%, volatile matter content of 19,28%-41,36%, content of bounded carbon of 44,32%-66,48%, density of 0,40 g/cm3-0,53 g/cm3, pressure stability of 9,99 kg/cm2- 15,89 kg/cm2, and calorie value of 5175 cal/g-6299 cal/g. Conclusion. Mixing nutshell charcoal, branch and tree stick of sengon and bamboo slice could be made for briquette and it had high enough value in calorie (5175kal/g -6299 kal/g). Four briquettes which had been produced were only briquette of Nutshell charcoal of Bamboo Sengon (KKSB) which got quality standard of Japan charcoal briquette at calorie value (6299 cal/g). But, Four briquettes didn’t get standard of charcoal briquette of America, Indonesia and UK. Composition of mixture-charcoal influenced charcoal density and calorie value. Composition of mixture-charcoal didn’t effect charcoal water content, ash content, volatile matter content, content of bounded carbon and pressure stability value.
Keyword: 

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model