Judul: Optical Properties and Crystal Structure  of Ferrum-doped Barium Titanate (BaTiO3) thin film.
Abstrak: Film tipis Barium Titanat didadah Ferrum telah berhasil disintesis menggunakan metode chemical solution depositioni (CSD) dan teknik spin coating. Film dibuat dengan mendeposisikan laruta kimia 2M pada substrat Si (100) tipe-p, lalu diputar menggunakan piringan spin coater pada kecepatan 3000 rpm dalam waktu 60 detik dan proses pendeposisian ini dilakukan sebanyak 5 kali. Sifat optik berdasarkan karakterisasi UV-Vis menunjukkan bahwa semakin tinggi konsentrasi Ferrum di dalam film Barium Titanat (0%; 0,5%; 1%) nilai reflektansinya akan semakin meningkat dan nilai band gap yang diperoleh menurun dari 2,8 eV – 2,4 eV. Jarak antara fonon optik longitudinal dan optik transversal mengecil seiring bertambahnya konsentrasi Ferrum. Hasil karakterisasi XRD menunjukkan parameter kisi yang menurun seiring dengan meningkatnya konsentrasi Ferrum di dalam film Barium Titanat, karena jari-jarik ionik atom Ferrum (0,77 Å) lebih kecil dibandingkan jari-jari Barium (1,36 Å)., Fe-doped Barium Titanate thin film in has been successfully synthesized using chemical solution deposition (CSD) method and spin coating technique. The film was made by depositing a 2M chemical solution on a p-type Si(100) substrate, then spin it using a spin coater plate at 3000 rpm for 60 seconds and this deposition process was carried out 5 times. The optical properties based on UV-Vis characterization show that the higher the concentration of Ferrum in the Barium Titanate film (0%; 0,5%; 1%) the reflectance value will increase and the band gap value decrease from 2,8 eV – 2,4 eV. The distance between the longitudinal and transverse optical phonons decrease on increasing the concentration of Ferrum. The XRD characterization results show that the lattice parameters decrease on increasing Ferrum concentration in the Barium Titanate film, because the ionic radius of the Ferrum atom (0,77 Å) is smaller than that of Barium atom (1,36 Å).
Keyword: barium titanat, energi bandgap, mode fonon, parameter kisi, bandgap energy, barium titanate, lattice parameters, phonon mode

Judul: Uji Sifat Kristal Dan Optik Film Tipis Barium
Stronsium Titanat (BaSrTiO3) Didadah Ferrum
Abstrak: WIDIA FATUROHMAH. Uji Sifat Kristal Dan Optik Film Tipis Barium Stronsium Titanat (BaSrTiO3) Didadah Ferrum. Dibimbing oleh IRZAMAN dan ARDIAN ARIF SETIAWAN . Film Barium Stronsium Titanat (Ba0,7Sr0,3TiO3) didadah dengan variasi konsentrasi ferrum (II) asetat (0%, 0,5%, 1%,) telah berhasil disintesis di atas substrat Si (100) tipe-p menggunakan metode CSD melalui spin coating dengan kecepatan putar 8000 rpm. Proses annealing dilakukan pada suhu 850 °C dan ditahan selama 8 jam, lalu mengikuti proses pendinginan hingga suhu kamar selama 13 jam. Karakterisasi UV-Vis menunjukkan bahwa semakin tinggi konsentrasi Ferrum di dalam film Barium Stronsium Titanat (0%; 0,5%; 1%) nilai reflektansinya akan semakin meningkat dan nilai band gap yang diperoleh menurun dari 2,34 eV – 2,25 eV. Parameter kisi yang dihasilkan dari hasil karakterisasi XRD menunjukan parameter kisi yang menurun seiring dengan meningkatnya konsentrasi Ferrum di dalam film Barium Titanat, karena jari-jarik ionik atom Ferrum (0,77 Å) lebih kecil dibandingkan jari-jari Barium (1,36 Å).Spektroskopi FTIR mengadopsi relasi Kramers-Kronig diperoleh indeks bias (n), koefisien extinction (k) dan parameter dielektrik bagian real (e1) juga bagian imajiner (e2) pada bilangan gelombang dengan penambahan pendadah Rutenium memperkecil medan listrik dan menyebabkan penurunan nilai moda optik TO dan LO yang memengaruhi konstanta optik sampel. Kata kunci: barium stronsium titanat, CSD, energi bandgap, parameter kisi, WIDIA FATUROHMAH. Test of Crystal and Optical Properties of Ferrum-doped Barium Strontium Titanate (BaSrTiO3) thin film. Supervised by IRZAMAN and ARDIAN ARIF SETIAWAN. Barium Strontium Titanate (Ba0,7Sr0,3TiO3) films capped with varying concentrations of ferrum (II) acetate (0%, 0,5%, 1%,) have been successfully synthesized on a p-type Si(100) substrate using the CSD method via spin coating with a rotating speed of 8000 rpm. The annealing process was carried out at 850 °C and held for 8 hours, then followed by cooling to room temperature for 13 hours. UV-Vis characterization shows that the higher the Ferrum concentration in the Barium Stronsium Titanate film (0%; 0,5%; 1%) the reflectance value will increase and the band gap value obtained decreases from 2,34 eV – 2,25 eV. The resulting lattice parameters from the XRD characterization results show a decreasing lattice parameter as the Ferrum concentration in the Barium Titanate film increases, because the ionic radius of Ferrum atoms (0,77 Å) is smaller than the radius of Barium (1,36 Å). FTIR spectroscopy adopting the Kramers-Kronig relation obtained refractive index (n), extinction coefficient (k) and dielectric parameter of the real part (e1) as well as the imaginary part (e2) at wave numbers with the addition of Ruthenium crucible minimizes the electric field and causes a decrease in the value of TO and LO optical modes which affects the optical constant of the sample. Keywords: bandgap energy, barium strontium titanate, CSD, lattice parameters
Keyword: bandgap energy, barium strontium titanate, CSD, lattice parameters

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