Judul: Sintesis dan Pencirian Natrium Titanat (Na2Ti2O4(OH)2) Berbahan Dasar Titanium Dioksida
Abstrak: TiO2 can be utilized as basic material for synthesis of sodium titanate (Na2Ti2O4(OH)2). This research was purposed to synthesize and characterize sodium titanate from TiO2 rutile powder as a basic material. Sodium titanate was synthesized by hydrothermal process at temperature 130 °C by mixing TiO2 rutile powder with 5 M and 10 M NaOH solution, then each was calcinated at temperature 700 °C. The energy dispersive X-ray analysis showed that sodium titanate has been successfully synthesized. This result was also supported by functional group analysis with Fourier transform infrared (FTIR) spectrofotometer showing the existence of Ti-O-Na vibration band at 989.42 cm-1. The formation of sodium titanate was depend on the reaction condition such as temperature, reaction time, and NaOH concentration. Scanning electron microscope image indicated that sodium titanate synthesized at 130 °C in 20 hours reaction time with 10 M NaOH had crystal size of 99.37 nm.
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Judul: Sintesis Hidrotermal dan Karakterisasi Kristal Titanium Dioksida (TiO2)
Abstrak: The aim of this research is studied about methode and temperature effect to phase and size of titanium dioxide (TiO2) crystal. Titanium dioxide (TiO2) crystal was synthesized by hydrothermal method with mixed of TiO2 powder (Rutile, Merck) and strong of natrium hidroxide (NaOH) in hydrothermal container at 180 °C for 48 h. After synthesized, one sample made without calcination (a) and two samples other were calcinated at 500 °C (b) and 800 °C for 2 h (c). The morphologies of crystals were analyzed using X-ray diffraction and Scanning Electron Microscopy (SEM). Crystal without calcination (a) was obtained with avarage size crystal about 0,147 nm and cristalinity was resulted about 37,84 %, this crystal was amorphous thus hadn’t formed into anatase or rutil phase yet. In second treatment (b), crystal was obtained with average size about 34,507 nm, crystal was formed into anatase phase and it had crystalinity about 70,38 %. In third treatment (c), crystal was more homogen with average size about 45,168 nm and crystalinity was resulted about 90,47 %. Crystal (c) was becomes unstable and transformed from anatase into rutile phase
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Judul: Ekologi merak hijau jawa (Pavo muticus muticus) Linnaeus 1758 pada beberapa tipe habitat di Ujung Timur Penyebarannya Jawa Timur, Indonesia
Abstrak: Merak hijau jawa merupakan salah satu jenis burung yang dilindungi.di Indonesia berdasarkan SK Mentan No 66/Kpts/Um/2/1973 dan Peraturan Pemerintah Republik Indonesia No 7 tahun 1999. Menurut ICBP (The International Council for Bird Preservation) merak hijau sebagai jenis burung yang tergolong terancam secara keseluruhan (globally threatened) baik populasi maupun habitatnya, sedangkan CITES mencantumkan merak hijau ke dalam Appendix II, merak hijau dari alam tidak bisa langsung diperdagangkan dan BirdLife International (2007) memasukkan golongan burung yang endangered. Tekanan terhadap populasi dan habitat merak hijau jawa sangat besar, sehingga kondisi populasinya menurun pada setiap penyebaran lokalnya, habitatnya terfragmentasi bahkan terisolasi. Tekanan terhadap populasi terutama karena perburuan liar. Namun demikian fakta menunjukan bahwa merak hijau jawa masih ada (exist), hal ini memberikan gambaran bahwa burung ini tentunya memiliki strategi ekologi tertentu untuk tetap bertahan hidup di alam pada berbagai tipe habitat.
Keyword: Pavo muticus muticus, Call count transect method, Pavo cristatus, Pavo muticus, Pavo muticus spicifer, Pavo muticus imperator, Pavo muticus muticus, Javan Green Peafowl, East Java