Judul: Studi morfologiperbandingan induksi persembuhan kerusakan tulang oleh bahan implan tulang hidrosiapatit dan beta-trikalsiumfosfat
Abstrak: This study was conducted with aim to investigate the effectiveness implant material of Hidroxyapatite (HA):Beta-tricalcium phosphate (β-TCP) bone implant made from eggshell with ratio of HA:β-TCP 70:30 and 60:40 in inducing bone remodelling process at macroscopic and microscopic levels. Five milimeters thick implant was inserted aseptically in sheep tibia bone using surgical prosedures. Data were collected at days 30, 60 and 90 after implanted. There were no significant difference between HA:β-TCP with ratio 70:30 and 60:40 in bone remodelling process at macroscopic and microscopic observation. Remodelling process in control group was faster than HA:β-TCP implanted bone. There was no sign of rejection against HA:β-TCP implant. HA:β-TCP showed osteoinductive and osteoconductive characteristics although remodelling process was slower than the controls.
Keyword: remodelling., hidroxyapatite, bone implant, Beta-tricalcium phosphate, Beta-tricalcium phosphate, Bogor Agricultural University (IPB)

Judul: Kajian Morfologi Proses Persembuhan Kerusakan Segmental Pada Tulang Domba Yang Diimplan Dengan Komposit Hidroksiapatit-Trikalsium Fosfat (HA-TKF)
Abstrak: This study was aimed to evaluate in vivo osteogenesis potency of bones implanted with graft of hydroxyapatite-tricalcium phosphate (HA-TCP) composite. This study also observed the potential use of HA-TCP as bone substitution material. Three local sheeps were used in this study. The implant was inserted under aseptic surgery on the proximal medial of the left tibia bone and as control the proximal medial of the right tibia bone was drilled without implant. Bones were harvested after 30, 60, and 90 days post-surgery and observed macroscopic and microscopically. The parameters of observation were the condition, shape and degradation degree of the implant, bonding between implant and host bone, new bone growth into the implant and signs of inflammation reaction around the implant. The result showed that the healing process on control bone was faster than those of the implanted bone. The bone implant had been already degradated in treated group of day 30 post-surgery. HA-TCP bone implant shown some signs for its biocompatibility, biodegradability, bioresorbability and osteoconductivity properties. Therefore, it is suggested that HA-TCP implant might be used as bone substitution in the bone lesions with approximately 30 days of recovery.
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Judul: Model Input-output dalam Masalah Network Flow
Abstrak: Production process is a process, which is done by industry, to transform input into output. According to the type of output and its activity, industry can be classified into various sectors, which are connected to each other. Therefore, a model to analyze the connection among sections is needed. The model is known as input-output model (IO model). IO model presents an IO table, which shows informations about the transaction between goods and services in each economic sector. Furthermore, the IO model also shows that the amount of all input is the same as the amount of all output. In this paper, the transaction of each economic sector in IO table is analyzed using network flow theory. The formulated network flow problem implies that each sector represents partly as a producer and also as a consumer. This paper also solves a minimum cost circulation problem.
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