Judul: Rancang Bangun Alat Pengukur Percepatan Gravitasi pada Bidang Miring Berbasis Microcontroller Arduino Uno
Abstrak: Pada penelitian ini telah dilakukan pembuatan alat pengukur percepatan gravitasi pada bidang miring yang terbuat dari acrylic. Pengukuran waktu dilakukan menggunakan RTC DS1307 sebagai pengganti stopwatch. Photodioda dan LED Infra Red diletakkan di posisi awal dan akhir dari bidang miring. Sensor ultrasonik digunakan untuk mengukur ketinggian bidang miring serta sudut elevasinya. Proses pengambilan data dilakukan untuk 5 kali variasi ketinggian, masing-masing dengan 30 kali pengulangan. Hasil pengukuran menunjukkan semakin besar sudut elevasi, semakin singkat waktu yang dibutuhkan benda, sehingga percepatan semakin besar. Percepatan gravitasi rata-rata dihasilkan adalah 9.86 m/s2 dan ralat relatif percepatan gravitasi sebesar 0.5%.
Keyword: Led Infra Red, photodiode, ultrasonik

Judul: Rancang Bangun Alat Ukur Kemurnian Air Berbasis Arduino Nano.
Abstrak: Kemurnian air merupakan salah satu indikator mengukur kualitas air minum. Dalam penelitian ini kami membangun sebuah sistem yang dapat mengukur kemurnian air. Tingkat kekeruhan air dapat diukur menggunakan sensor TCS3200, sedangkan sensor konduktivitas untuk memeriksa keberadaan ion dalam air. Sensor TCS3200 diatur pada rentang 0 – 85 NTU (Nephelometric Turbidity Units), sedangkan sensor konduktivitas diatur tidak ada ion pada air aquades. Nilai keluaran dari sensor TCS3200 berupa nilai RGB (Red Green Blue) dan sensor konduktivitas berupa nilai ADC (Analog to Digital Converter). Hasilnya menunjukan bahwa sistem yang dibuat dapat menentukan tingkat kekeruhan air dan dapat menentukan keberadaan ion dalam air. Hasil pengukuran ditampilkan pada OLED berupa kesimpulan dalam pembacaan.
Keyword: aquades, kekeruhan air, sensor konduktivitas, sensor TCS3200.

Judul: Phylogeography and Species Limits in the Papuan White Snake (Micropechis ikaheka) (Reptilia: Serpentes: Elapidae)
Abstrak: Papua white snake, Micropechis ikaheka, has been distingushed into two subspecies M.i. ikaheka and M.i. fasciatus. However, due to lack of data on their morphology, distribution and ecology, both subspecies often ignored in scintific discussions and refers only byas , Micropechis ikaheka. This study was designed to document the differences between M.i. ikaheka and M.i fasciatus by using scales characteristics and reproductive organ or hemipenes. The study also examine, zoogeography, habitat, diet and cannibalism of both subspecies to better understanding the the ecology of one of the most venomous snakes in the world. This study consists of three topics with method and also different in the size samples, respectively. The first study is the histology and microtopography of the skin were studied using paraffin method and Scanning Electron Microscope (SEM). The second is the hemipenis were examined by following Myers and Cadle (2003), and Zaher and Prudente (2003). The third is the abdominal surgery was carried out to document diet type and the investigate phenomenon of cannibalism in the snake. Specimens for this study came from the collection from Museum Zoologicum Bogoriense (MZB) and Universitas Negeri Papua’s Laboratory (LZU). The research result also indicated that the markers of skin and hemipenis described the same structure and microornamentation in all M. ikaheka groups being compared. Based specimens examined morphological descriptions do not s support the further differentiation in Micropechis. In short, two markers that used in this study could not sufficiently indicate the differences in the level of species and subspecies of M. ikaheka. The study, however, were able to delineate zoogeography and skin color patterns, which fall into four groups: M. i. ikaheka; M. i. fasciatus. M. i. ssp. “intermediate”; and M. i. ssp “black”. This study also revealed that color variations did not overlap in their geographic distribution. It is therefore, it suggested that environmental factors may contribute to the skin color variations. It also assumed that habitat discontinuous and biogeography factors may also cause the loss of the connection between the original populations (vicarians) or follow colonization events (dispersal). The examined of 22 stomach contents of M. ikaheka shows this species is carnivorous, and prey on vertebrates such as amphibians, fish, reptiles, and Mammals. These snakes are opportunistic predators since they prey on all that can be captured, but mainly reptiles (61.5%), followed by mammals and fish (both 15.4%), and amphibians (7.7%). Although categorized as terrestrial animal, the diet study showed that M. ikaheka snakes often go into the water to hunt for fish (the sample from Yapen island), including eel (the sample from Aru island). Based on prey items indentified, there is evidence that M. ikaheka is cannibal. At this time, there still no record on reason for cannibalism, but it is assumed that cannibalism was due to competition between populations and means to control population.
Keyword: geographic variation, white snake, papua