Judul: Sintesis Senyawa Kalsium Fosfat Dengan Teknik Presipitasi Single Drop
Abstrak: The high damage of bone trigger a variety of research about bone biomaterial. So far, compliance for this needed done import materials. The material which used for bone biomaterial is calcium phosphate. In this research used synthesis of calcium phosphate. Synthesis of calcium phosphate performed using precipitation method single drop and wise drop at room temperature with sintering themperature 900oC, themperature 70oC with sintering time variation (110oC, 300oC, 600oC, and 900oC). Results obtained from sintering is fluffy white powder. Result from x-ray diffraction characteristic for all sample with themperature sintering 900oC show the phase formed is calcium pyrophosphate and other phase from calcium phosphate that is hydroxyapatite, tricalcium phosphate, octacalcium phosphate, carbonate apatite type-A and carbonated apatite type-B. The longer stirring time so the phase of calcium pyrophosphate formed the less. Reaction themperature is very effect in formation of phase calcium pyrophosphate, because calcium pyrophosphate which the resulting in room themperature is more than in themperature 70oC. Beside that precursor compound that has not reacted in themperature70oC more less from room themperature, this is because precursor compound is more faster when heated. In sintering variationthemperature 110oC and 300oC the precursor formed is more and the best sintering themperature is 900oC.
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Judul: Sintesis Biphasic Calcium Phosphate dari Cangkang Telur Ayam
Abstrak: Biphasic Calcium Phosphate (BCP) are structured from hydroxiapatite (HA) Ca10(PO4)6(OH)2 and β-Tricalcium Phosphate (β-TCP) β-Ca3(PO4)2. HA are stable in difficlut phases when implanted, that’s why modification are needed with the addition of β-TCP which are soluble. The eggshells which undergoes calcination process at 1000 C for 5 hours contains CaO. The creation process of HA and β-TCP with precipitation method called wise drop, this process of creating BCP with the sonication technique with time variable from 5 to 30 minutes and composition variables of 50%:50%, 60%:40%, and 70%:30%. The size of the HA crystal are 55.28 nm, β-TCP are 51.82 nm, and the BCP are range from 43.85 nm – 50.25 nm. Based on the result of FTIR, can gained supporting information of that the samples gained are pure HA and pure β-TCP which are known from the structure complexity OH- and PO43- without the waste of CO32-. According to the EDS results on of the BCP_2a sample spot which are gained randomly, it’s known that on the sample of the BCP there is β-TCP with a Ca/P ratio of 1.46 or close to 1.5.
Keyword: β-Tricalcium Phosphate, biomaterial, Biphasic Calcium Phosphate, hydroxiapatite, sonication.

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