Judul: Toksisitas Ekstrak dan Fraksi dari Daun dan Kulit Kayu Surian (Toona sinensis) Terhadap Larva Udang (Artemia salina L).
Abstrak: Surian (Toona sinensis) merupakan salah satu tumbuhan herbal yang banyak mengandung senyawa bioaktif. Bagian dari tanaman surian yang dapat dimanfaatkan sebagai terapi adalah daun dan kulit kayu. Penelitian ini bertujuan menentukan toksisitas ekstrak daun dan kulit kayu surian melalui uji Bhrine Shrimp Lethality Test (BSLT), lalu membandingkan konsentrasi toksik dari ekstrak air, dan etanol 70%, serta fraksi n-heksana, dietil eter dan etil asetat terhadap larva udang (Artemia salina L). Hasil penelitian menunjukkan kadar air simplisia daun sebesar 8.08% dan kulit kayu sebesar 6.26%. Nilai rendemen ekstrak tertinggi oleh pelarut etanol sebesar 23%. Hasil analisis probit uji BSLT menunjukkan ekstrak fraksi etil asetat kulit kayu memiliki toksisitas tertinggi dengan nilai LC50 sebesar 405.641 ppm, sedangkan ekstrak air daun memiliki toksisitas terendah dengan nilai LC50 707.787 ppm.
Keyword: Surian, BSLT. Toksisitas, LC50

Judul: Toksisitas Minyak Atsiri Kayu Surian (Toona Sinensis Roemor) Terhadap Larva Udang Artemia Salina Leach
Abstrak: Indonesia which known as a high biological diversity is a potential country to develop medicinal plants species and explore the active compounds contained in it. Surianwood (Toona sinensis Roemor) is one of the species which potentially developed because it has been proved for containing active compounds that are toxic to certain types of cancer and has antioxidant and antibacterial effect, but it haven’t managed to isolate the active compounds. This research uses the column chromatography method with increased polarity to separate the essential oil into its fractions, then tested to A. salina shrimp larvae. The fractionation generates 9 fractions with fraction 1 is most active fraction which LC50 6.79 μg/mL. This fraction dominated by spathulenol (14.93%), neoallocimene (10.17%), α-curcumene (6.54%), β-elemene (3.40%) and ledene (3.39%).
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Judul: Pengembangan Sistem Rotasi Peta pada Perangkat Mobile tanpa Sensor Magnetometer
Abstrak: Due to the improvement of technology, the function of mobile phone has changed a lot. Nowadays, mobile phone is used not only for communication, but also to support the user’s activity. Many mobile phones now have Operating System (OS) and sensors like GPS and magnetometer. GPS is a sensor that can be used to identify any location, including the location of the user, while magnetometer can be used to identify direction. With data that come from GPS and magnetometer, we can build a navigation application that can rotate its map according to the rotation of the user. Meanwhile, in the Android Compability Definition Document point 1.6 until 2.2, Google have requirements for mobile phones to have GPS and magnetometer sensors if they want to use Android OS. But, since the release of 2.3.3 OS, Google has changed its requirements, allowing any mobile phones to have Android OS without having the magnetometer sensor. The objective of this research is to build an navigation application that can rotate without using magnetometer sensor. The value of the rotation degree is taken from last two position. To stabilize the value, Exponential Smoothing is used in filtering process. This system also use Haversine method to recognize whether the user is walking or driving/riding.
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