Judul: Kajian reduksi Cr(VI) pada lumpur kering limbah penyamakan kulit
Abstrak: Lumpur kering lirnbah penyarnakan kulit (LKLPK) rnengandung hara makro dan hara mikro dalam jumlah yang cukup tinggi. tetapi disisi lain juga mengandung bahan cemaran berupa logam berat krom dan garam. Kandungan krom total LKLPK dapat mencapai 3-7% bahan kering, sehingga sangat membatasi penggunaannya sebagai pembenah tanah atau pupuk organik. Cr(VI) dikenal sangat toksik dan karsinogenik bagi ternak dan manusia.
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Judul: Reduksi Cr(VI) oleh fotokatalis TiO2 yang dideposisi pada permukaan logam dan uji ketahanan korosinya
Abstrak: Limbah logam berat Cr(VI) dapat ditanggulangi dengan metode fotokatalisis, yakni memanfaatkan sinar ultraviolet (UV) untuk menghasilkan spesi pengoksidasi dan pereduksi pada permukaan katalis, sebagai contohnya TiO2 anatase. Penelitian ini bertujuan mempelajari perubahan konsentrasi Cr(VI) pada kondisi pH yangberbeda melalui fotokatalisis TiO2 dan ketahaan oksidasi logam yang terdeposisi TiO2. Lempeng logam dicelupkan dalam larutan prekursor Ti(O-i-C3O2)4 hingga TiO2 terdeposisi pada permukaan logam. Fase TiO2 dianalisis dengan difraksi sinar-X (XRD), pengamatan mikrostruktur, uji fotokatalisis, dan uji korosi.
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Judul: Variabilitas Suhu Permukaan Laut dan Interelasinya dengan Muson, Dipole Mode (DM) dan El Nino Southern Oscillation (ENSO) di Perairan Asia Tenggara dan Sekitarnya.
Abstrak: Variability of air-sea interaction in the Southeast Asia and its surrounding waters has an important role for regulating the Asian and Australian climate dynamics and the dynamics of ocean-atmosphere in the Indian and Pacific Oceans. The results of the first five largest variance of Empirical Orthogonal Function (EOF) analysis of monthly mean sea surface temperature between 1979- 2007 from data assimilation of Geophysical Fluid Dynamics Laboratory (GFDL) in the Southeast Asia waters are able to identify occurrence of the Monsoon activity, the period of Dipole Mode (DM) in Indian Ocean and types of El Nino Southern Oscillation (ENSO) in the Pacific Ocean. The heat dynamics of the sea and atmosphere in the Indonesia waters are probably the triggers of DM and ENSO after performing spectral density function of EOF expansion coefficients, wavelet transform and composite analysis based on one times of standard deviation above positive and below negative of expansion coefficient using Earth System Research Laboratory-National Oceanic Atmospheric Administration (ESRL-NOAA) dataset, including wind data, air temperature, air pressure, outgoing long wave radiation (OLR), rainfall, precipitation, evaporation, sensible heat, latent heat and humidity. Schematics of the dynamical processes of oceanatmosphere interaction were constructed based on composite analysis results by discovering unique pattern which are called as phase of Asymmetric Monsoon of Southeast Asia waters (AMSA), Heat Storing/releasing of Southeast Asia waters (SRSA), Dipole Mode of Southeast Asia waters (DMSA), Tripole Mode of Southeast Asia waters (TMSA) and the Mixed Mode of Southeast Asia waters (MMSA) to examine more insightful of the relationships between heat dynamics in the Southeast Asia and the origin processes of Monsoon, DM and ENSO. The rest difference of heat accumulation of AMSA phase in the Southeast Asia are therefore led to a shift of Monsoon and triggering a biennial cycle of the Tropical Biennial Oscillation (TBO) associated with decadal cycle in the SRSA phase is the beginning of DM and ENSO activity. After couple times of biennial cycle, the remaining difference of heat accumulation in the Southeast Asia is getting bigger and needed a new heat balance that generates a trigger of DM period and some types of ENSO. At the DMSA phase was formed DM transition period and conventional ENSO pattern, the TMSA phase as DM transition period and Central Pacific ENSO spread type (CP El Nino/La Nina spread type) and the MMSA phase which coincided peak of DM and Central Pacific ENSO centralized type (CP El Nino/La Nina centralized type).
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