Judul: Penentuan Lokasi Ideal Berdasarkan Total Jarak Tempuh Terpendek dari Berbagai Lokasi Menggunakan Algoritme Dijkstra
Abstrak: Finding shortest path is a method to maximize time efficiency to travel from one place to another. A good location is a place with minimum path from locations where it is accessed. A good location is considered to be potential for public facility, housing complex, etc. In this research, graph theory is used to solve the problem of deciding location with minimum path from accessing locations. Mapping of a region is represented as a graph with location points and accessing locations as nodes and variation paths as arcs. The next step is finding the shortest path for every location candidate nodes from accessing nodes using Dijkstra algorithm. This research resulted in a web based aplication that presents a territory map and a user can choose where the location candidates and accessing locations are. The user will be shown the best location out of location candidates.
Keyword: Bogor Agricultural University (IPB), shortest path, region mapping, graph, Dijkstra algorithm

Judul: Aplikasi Mobile Penentuan Rute Terpendek di Kebun Raya Bogor Menggunakan Algoritme Dijkstra
Abstrak: Bogor Botanical Gardens (BBG) has many trees, plant collections, and points of interest which located in a wide area around 87 hectares. In addition, BBG also has a museum building, laboratory, and many important places which give difficulty for a person to reach those location. Because of the distance of each location, navigation or guide becomes essential for travelers who want to looking around BBG with optimum time. These problems can be solved by graph modelling to determine the shortest route from each location using Dijkstra algorithm. Based on the results of comparative testing in applications with spacing distance pedometer difference obtained an average error distance is 65.3 meters, this is because the location coordinate data obtained from different Google Maps with location coordinates of the received GPS signal while in KRB on pedometer application.
Keyword: Bogor Agricultural University (IPB), Dijkstra algorithm, shortest path, graphs, navigation

Judul: Mercury Toxicity and It’s Effect on Histopathology Change of Nile Tilapia (Oreochromis niloticus).
Abstrak: Nile tilapia (Oreochromis niloticus) is one of fish species that oportunity to contaminated with mercury. The effects of pollutants can damage living organisms organs and can cause death. The effects caused mercury had acute or chronic character. The aims of this study are to determine threshold and acute toxicity of mercury chloride (HgCl2) of Nile tilapia (Oreochromis niloticus), to assess the effect of mercury chloride (HgCl2) on several biometric parameters (survival, growth rate of average daily weighted, liver condition, bile and reproductive variability of Nile tilapia (Oreochromis niloticus), assess the level of damage to the histological structure of the gills, liver and kidney of Nile tilapia (Oreochromis niloticus) caused mercury chloride (HgCl2) exposure. This study was conducted from February to June 2013. Nile Tilapia (Oreochromis niloticus) were used in this study were female with average weight 20 grams or 11-13 cm length range. Toxicant materials used in this study was mercury chloride (HgCl2). Fish were reared in each aquarium 60x40x30 containing 48 liters of water. This study consists of three stages: a preliminary test, acute test, and sub-chronic test. To determine the changes in biometric condition of tilapia approximated by measuring the survival rate (SR), the growth rate of average daily weight , the content of mercury in the fish organs, hepatosomatic index (HSI), the relative bile volume (VER), gonadal soamtic index (IKG), fecundity and oocit diameter, tissue damage caused by mercury in fish organs by making histological preparations stained with hematoxylin and eosin. The median lethal concentration (96 hr, LC50) of Mercury Chloride was calculated as 1,64 mgL--1.The survival rate was highest in the control treatment (46,67 %) . Mercury chloride with concentration 0.196 mgL--1 show significant effect to changes HSI and relative bile volume, and oocyte diameter of Nile tilapia (p < 0,05). Mercury chloride with a concentration of 0,164 mgL-1 and 0,196 mgL-1 have not a significant effect on the growth rate of weight, gonadal somatic index and fecundity of Nile tilapia (p > 0,05). Mercury chloride cause damage to gills (hyperplasia, hypertrophy, proliferation and neukrosis), liver (hyperplasia, hemorhage, shrinkage of hepatocytes, proliferation and neukrosis) and kidney (hyperplasia, hemorrhage, shrinkage of the glomerulus, proliferation and neukrosis).
Keyword: Nile tilapia, Hepatosomatic indexs (HSI), histopathology