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: Pencarian Jarak Titik Akses Sinyal Wireless Fidelity (WiFi) dengan Location Based Service (LBS) pada Android di Area IPB Darmaga
Abstrak: The WiFi signal access point in IPB Darmaga area is unevenly spread and overlap. Users have difficulties to access it. This research aims to develop a system, namely imWiFi, which can help users accessing WiFi signal in IPB Darmaga. One of the feautures provided by the system is provide the information of the WiFi signal access point distance. The distance information can be yielded by Location Based Services (LBS). LBS used in this research is the LBS services from Google Maps and application of Haversine formula. Comparison between Google Maps and Haversine formula is used to determine percentage of the distance comparison between two different algorithms. The percentage comparison distance between Google Maps and formula Haversine is 64.61% with the error value of 0.8204. The development of the system has successfully implemented three of four principal functions. Thus, 75% of overall systems was successfully developed.
Keyword: WiFi, location based service (LBS), GPS, distance

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