Judul: Studi Karakteristik Hidroksiapatit dari Cangkang Telur Ayam Ras dan Ayam Kampung.
Abstrak: Hydroxyapatite is a calcium phosphate compound that has a chemical structure similar to bone mineral . This research aims to synthesize hydroxyapatite using wise drop precipitation method. Sources of calcium were taken from the broiler chicken eggshells and domestic chicken eggshells; and (NH4)2HPO4 as a source of phosphate. Hydroxyapatite synthesis was done using 2 variations of drying process, the first drying process was not retained and the second drying process was retained for 5 hours. The result from XRD characterization showed that samples overall resulted in hydroxyapatite phase despite there were still phases of AKA and TCP. The crystal size of HA from domestic chicken eggshells is smaller than HA from broiler chicken eggshells. The characterization of SEM showed that of hydxyapatite samples morphology has oval shape that are dense and uniform, the particle size of HA from domestic chicken eggshells is smaller than the HA from broiler chicken eggshells. The smaller crystal and the particle size of HA means the better HA for reaction and solution in body tissues. Characterization of EDXA showed the calsium element from broiller eggshells is larger than that of domestic chicken eggshells
Keyword: hydroxyapatite, eggshells, broiler chicken, Domestic chicken

Judul: Observasi Morfologi dan Komposisi Hidroksiapatit yang Terbuat dari Cangkang Telur Ayam Kampung dan Ayam Ras
Abstrak: This research showed synthesis of hydroxyapatite by wise drop precipitation method. Hydroxyapatite precipitation results was made of calcium precursors derived from domestic and broiler chicken eggshell and a source of phosphate using (NH4)2HPO4. Hydroxyapatite was synthesized at 110 °C for 5 hours and without holding time. Powder of chicken eggshells were characterized using Fourier Transform Infrared spectrometer and SEM-EDX. Chicken eggshell after calcination showed powders of CaO, and elements C of about 1.54% and 0.92%, element Mg about 0.42% and 0.62% and element P about 0.26% and 0.49%. Morphological structure after calcination showed uniform matrix. Content of calcium in the powder of domestic chicken eggshell is 64.72% while broiler chicken eggshell is 71.11%. The content of functional groups in hydroxyapatite characterization by Fourier Transform Infrared have OH-, PO43- bending which shows the characteristics of hydroxyapatite. Morphological structure of hydroxyapatite samples showed visible adjacent structures and small particles with uniform particle size vary with particle length and width of the particle around 0.34 to 0.39 and 0.13 to 0.16. While composition ratio Ca/P of hydroxyapatite sample obtained in range of 1.5 to 1.62.
Keyword: SEM-EDX., hydroxyapatite, FTIR, Chickens Eggshell

Judul: Variabilitas Transpor Arlindo Laut Flores dan Kaitannya dengan ENSO
Abstrak: Air Arlindo yang masuk ke Indonesia sebagian besarnya dilewatkan Laut Flores. Variasi volume transport Arlindo dipengaruhi oleh fenomena anomali iklim interannual seperti El Nino Southern Oscillation (ENSO). Hasil studi terdahulu menyimpulkan terjadinya La Nina meningkatan jumlah transport Arlindo, sedangkan El Nino melemahkan transport Arlindo. Untuk memahami lebih lanjut keterkaitan ENSO dengan variabilitas transport Arlindo dilakukanlah penelitian menggunakan data hasil model INDESO dan hasil observasi satelit dengan rentang waktu 2008 hingga 2015. Penelitian dilakukan di Laut Flores dengan mengkaji bagian barat (119.5oBT) dan bagian timur (123oBT) untuk melihat volume Arlindo yang masuk ke dan keluar dari Laut Flores. Analisis sirkulasi dilakukan dengan menghitung rataan komponen arus dan suhu permukaan laut secara tahunan dan pada rentang tahun ENSO untuk melihat pola sirkulasi perairan. Estimasi volume transpor dihitung dari transek di pintu barat dan pintu timur. Deret waktu volume transpor Arlindo Flores kemudian dianalisis variabilitasnya dengan analisis penapisan lolos-pita(band-pass filter) dan transformasi wavelet sinambung (Continous Wavelet Transform). Hasil penting studi ini menunjukkan bahwa sumber utama Arlindo Flores berasal dari pembelokan Arlindo Makassar dan Arlindo pintu timur Indonesia yang masuk melalui terusan Lifamatola. Kecepatan Arlindo Flores di lapisan tercampur menguat pada musim barat sebaliknya di lapisan termoklin Arlindo Flores menguat pada musim timur. Sumbu utama Arlindo Flores didominasi oleh komponen arus zonal serta mengalami intensifikasi dan bergerak menyusur bagian utara Kepulauan Nusa Tenggara. Fluktuasi Arlindo Flores pada skala-waktu interannual menunjukkan volume transport maksimum terjadi pada tahun La Nina (November 2008-Maret 2009), sedangkan volume transpor minimum terjadi pada tahun El Nino (November 2014-Desember 2015). Struktur menegak Arlindo lebih kuat di kedalaman antara permukaan sampai 400 m. Variabilitas Arlindo Flores menandakan adanya fluktuasi pada periode intraseasonal, semi-annual, dan annual. Fluktuasi Arlindo skala interannual muncul jelas dari hasil penapisan lolos-pita, dimana fluktuasinya terlihat signifikan di kedalaman termoklin.
Keyword: Arus Lintas Indonesia, Laut Flores, ENSO, INDESO model, variabilitas volume transpor