Judul: Implementasi Aplikasi Android untuk Pencarian Lokasi WiFi Terdekat dengan Algoritme Haversine dan Great Circle (Studi Kasus: Jaringan Nirkabel IPB)
Abstrak: Teknologi wireless (WiFi) telah menjadi standar dalam dunia teknologi informasi. Pertukaran data melalui media transmisi udara dapat membantu manusia dalam bertukar informasi secara dinamis, fleksibel, dan cepat. Tujuan dari penelitian ini adalah untuk mengembangkan database dan aplikasi berbasis Android untuk mengelola perangkat WiFi. Tujuan tersebut memfasilitasi pengguna untuk memilih koneksi WiFi terbaik di sekitar Institut Pertanian Bogor (IPB). Jarak dan daya transmisi sinyal adalah parameter yang digunakan dalam memilih koneksi terbaik. Informasi jarak dan sistem navigasi menuju titik akses point WiFi dihitung dengan algoritma haversine dan great Circle. Android API menghitung nilai frekuensi dan kekuatan sinyal WiFi. Persentase rasio dari jarak antara haversine dan great circle adalah 61.84%. Pengguna menggunakan rasio tersebut untuk mempertimbangkan posisi terbaik ketika mencari titik akses WiFi. Semua fungsi dalam pengembangan sistem berjalan dengan baik.
Keyword: Android, API, great circle, haversine, WiFi

Judul: Aplikasi Pencari SPBU Terdekat di Area Bogor dengan Location Based Service Berbasis GPS pada Android
Abstrak: Nowadays mobile phones are not only used as a means of communication, but also by taking advantage of some features such as the global positioning system (GPS), a mobile phone can be used as a navigational tool from user position to object around the user. Gas station is one of the point of interest (POI), because its location is very useful especially for motorists. This study aimed to build an application of location based services (LBS) in the Bogor area, to display the gas station on the map, to determine the nearest gas station that is located around the user and to display the route to the gas station. The application is built for the Android smartphone, with Java programming language, SQLite as the database storage, GPS to obtain the user's position and Google Maps as the map viewer. From the test conducted, this system has been able to work well and produce correct output.
Keyword: Android, location, LBS, GPS, gas station

Judul: Pengaruh Konsentrasi Katalis Methyl Ester Sulfonic Acid Terhadap Sifat Fisikokimia Gliserol Ester Oleat yang Dihasilkan
Abstrak: Glycerol is a by-product from palm olein biodiesel industry which could be value-added to obtain various products. One of the alternatives is to modify glycerol become glycerol ester oleat. Before processing, glycerol was first refined using 5% (v/v) phosphoric acid 85%. The refinery showed that glycerol content was increased from 49% to 80%. Glycerol was then esterified with oleic acid and catalyst methyl ester sulfonic acid (MESA) to obtain glycerol ester. Esterification was conducted at 240°C and nitrogen atmosphere using 200 rpm of mixing for 90 minutes. The best catalyst concentration used in esterification process is at 0,5% and resulting glycerol ester oleat with acid number 48,07 mg KOH/g sample, density of 0,9124 g/cm3, viscosity 68,32 cP (25°C), kinematic viscosity 36 cSt (40°C), flash point 230°C and pour point -15°C.
Keyword: glycerol ester, glycerol