Judul: Analysis of Sea Level Rise and Inundation Area in the Cirebon Coastal Area
Abstrak: Wilayah Cirebon merupakan daerah yang terletak di wilayah pesisir yang bersentuhan langsung dengan fenomena pasang surut di laut. Tpografi di wilayah pesisir Cirebon tergolong landai yang menjadikan wilayah tersebut rentan terhadap genangan air yang diakibatkan oleh kenaikan muka laut. Penelitian ini bertujuan untuk mengetahui laju kenaikan muka laut berdasarkan analisis data pasang surut di wilayah kajian tahun 2010-2020 dan memprediksi luasan genangan pada tahun 2030 mendatang. Data penelitian yang digunakan adalah data pasang surut wilayah Cirebon yang didapat dari Badan Informasi Geospasial (BIG) yang kemudian diolah untuk mendapatkan nilai Mean Sea Level (MSL) bulanan dan tahunan. Laju kenaikan muka laut dianalisis dengan metode Admiralty. Prediksi luas daerah genangan dilakukan denganmelakukan tumpang susun (overlay) antara data elevasi pantai yang diinterpolasi dengan nilai laju kenaikan muka laut. Laju kenaikan muka laut di wilayah pesisir Cirebon adalah 3,97 mm/tahun. Tipe pasang surut yang terjadi diperairan pantai Cirebon adalah tipe campuran condong harian ganda (Mixed Semidiurnal) dengan bilangan Fromzahl pada bulan Juli 2020 adalah 0,97. Prediksi tinggi genangan air di Cirebon pada tahun 2030 adalah setinggi 50,08 cm dengan luas daerah tergenang 6.334,68 Ha. Kata Kunci : Kenaikan Muka Laut, Admiralty, MSL, daerah genangan
Keyword: ea Level Rise, Admiralty, MSL, inundation area

Judul: Perubahan Paras Muka Laut dan Dampaknya Terhadap Genangan di Daratan Pesisir Kota Semarang, Jawa Tengah
Abstrak: Sea level changing along the time with Mean Sea Level (MSL) shows increasing trend. Semarang City that facing subsidence also impacted by the change of sea level in term of sea level rise and tides. The recorded and reconstructed data (from CSIRO) shows that global sea level rose to 6.83 cm by Dec-2009. Regional sea level change data from University of Colorado also shows the increasing trend of sea level. Three months (Dec-2011 to Feb-2012) realistic tides model that has been generated using FVCOM shows the highest level of the sea surface was 0.473 m while measured sea level in coastal water area of Semarang City by 2010 was 94.669 cm. Measured sea level has to be corrected because the area where it measured experiencing land subsidence. Correction result shows isostatic mean sea level in 2010 was 52.070 cm. Subsidence rate in the location where sea level has measured (Tanjung Mas) can be estimate with the deviation between mean sea level data from tide gauge that experiencing subsidence and isostatic sea level. The result of estimation shows subsidence rate in Tanjung Mas is 7.1 cm/year. The impact of sea level change until 2011 has been formed 1,043.527 Ha of submergence area. Projection in the future shows that in next ten years submergence area will reach ± 3,627 Ha while in next 15 years submergence area will reach ± 4,364 Ha and in next 20 years submergence area will reach ± 4,641 Ha. When spring tides occur, the impact of sea level change will getting worst because area with altitude up to 0.47 from submergence area will be inundated by seawater.
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Judul: Synthesis of Apatite - Chitosan Composite Using Duck Eggshell and Chitosan with Temperature and pH Control
Abstrak: Composite of apatite-chitosan was prepared by using chitosan as polymer matrix. Calcium phosphate was prepared from CaO and (NH4)2HPO4, which the ratio Ca : P had to be 1.67. Chitosan is produced by deacetilase from biopolymer chitin. Duck eggshell (95% CaCO3) as starting material was converted to be calcium oxide (CaO) through calcinations with temperature 1000oC for 5 hours. In-situ and ex-situ methods were prepared from apatite and chitosan (dissolved with acetate acid 2%). Calcium phosphate prepared for bone implantation, but it is too fragile and brittle to be implant into the body. So addition of chitosan can decrease crystalinity and increase mechanic characteristic (tougher). Composite apatite-chitosan was resulted by fast precipitation. Fast precipitation was held in a breaker glass with nitrogen atmosphere, under controlled temperature at 37oC and pH 7, in order to increase amount of hydroxyapatite. Precipitation with CaO which was dropped by (NH4)2HPO4. Hydroxyapatite and chitosan were appearing at samples with in-situ and ex-situ methods which indicating by peak matching of XRD (closed lattice parameter, crystal size), overlapping at FTIR spectra and supporting by SEM picture (homogenous and agglomerated particle). However, it still needs further research to examine biocompatibility osteoconductive degree of sample by in-vivo and in-vitro test.
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