Judul: Nitrogen Content (N) of liquid Organic Fertilizer from Urine Addition in Liquid Sludge of Bio Gas Digester with Cow Feces as Influent.
Abstrak: Animal processing plant has resulted mainly product like milk, meat and egg. Beside that, animal processing plant was produced waste which could be demage to environment and human life. Dairy processing plant is one of animal processing plant and milk as a main product and faeces, urine and slurry as animal waste. Use of animal waste as influent in bio gas digester to product source of energy (methane) and sludge which of still fertilizer content and need to be continous processing in order to get a good quality of fertilizer content trough out liquid composting wich added dairy cow urine as nitrogen (N) source. This research was held in October 2002 until November 2002 in Kebon Pedes, Tanah Sareal, Bogor City, in Biotrop and in Laboratorium Animal production, in Sub. Lab. Animal Waste Treatment and Animal By-product, Facuity of Animal Science, Bogor Agriculture. This research was used urine 0, 2, 4, 6 litter as a treatment, in 20 littes sludge from bio gas digester and then composted for ten days. The paramter was measured nitrogen (%) and with commposite of carbon (%), phosphor (%), potasium (%), nitrate (ppm), Cation Exchange Capacity (CEC) meq/100g, C/N ratio dan pH at five first days composting. The design analitycal methode in this research was used Randomized Block Design (RBD) and four digesters as group.
Keyword: 

Judul: Kandungan nitrogen dan fosfor pupuk organik cair dari sludge instalasi gas bio dengan penambahan tepung tulang ayam dan tepung darah sapi
Abstrak: Composting is not a new thing in the public and so many methods in composting which implemented to support composting technology. Composting is defined as biochemical process to transform organic material to manure by microorganism integrated or separated. Motivated by expanded of rumour continuing farming in safe environment, pollution, and reduction land fertility content consequence of chemical fertilizer, also about the higher of artificial fertilizer price, cause the interest of farmer and society increase to use organic fertilizer as soil nutrition in agriculture development system.
Keyword: 

Judul: Aproksimasi Fungsi Sinus dan Kosinus sebagai Kombinasi Linear dari Fungsi Eksponensial
Abstrak: Salah satu gagasan yang menarik dalam matematika adalah aproksimasi suatu fungsi oleh fungsi lain. Sebagai contoh, fungsi polinom dapat diaproksimasi menggunakan deret Taylor atau fungsi persamaan diferensial dapat diaproksimasi menggunakan deret Fourier. Adapun fungsi yang dapat mengaproksimasi fungsi lain salah satunya adalah fungsi eksponensial. Kemungkinan mengaproksimasi fungsi dengan kombinasi linear dari fungsi eksponensial dari bentuk eˣ, e²ˣ, ... dianggap sebagai perkembangan sejajar dengan gagasan Deret Taylor yang mengaproksimasi fungsi dengan kombinasi linear dari segi fungsi kuadrat. Fungsi sin x dan cos x digunakan sebagai target untuk menilai seberapa baik aproksimasi yang dilakukan oleh fungsi yang diberikan. Aproksimasi fungsi sinus dan kosinus menggunakan hampiran Taylor lebih akurat dibandingkan dengan aproksimasi menggunakan fungsi eksponensial.
Keyword: Aprosimaksi eksponensial, aproksimasi fungsi, aprosimaksi Taylor, fungsi eksponensial