Judul: Penddugaan nilai radiasi di jenis tutupan lahan hutan dengan aplikasi remote sensing: studi kasus hutan penelitian dan pengembangan kehutanan departemen kehutanan dan Kebun Raya Bogor
Abstrak: Tujuan penelitian ini adalah mengaplikasikan teknik remote sensing untuk menduga nilai radiasi yang meliputi radiasi datang, radiasi pantul, radiasi absorbsi dan transmisi pada hutan. Kisaran nilai albedo yang didapatkan untuk hutan adalah 0.06 – 0.09. Nilai radiasi refleksi yang didapatkan untuk hutan penelitian dan pengembangan kehutanan, Bogor adalah 56.5 W/m2. Nilai radiasi refleksi yang didapatkan untuk kebun raya bogor pada saat pengambilan data adalah 57.16 W/m2. Dengan memanfaatkan informasi pantulan energi yang direkam oleh sensor satelit dan nilai albedo dengan beberapa parameter perhitungan yang digunakan, didapatkan nilai radiasi gelombang pendek yang diterima permukaan saat pengukuran sebesar 613.39W/m2 dan radiasi selama satu hari dengan assumsi pola radiasi sinusoidal sebesar 17.46 MJ/m2. Nilai suhu permukaan dengan rata rata 26.54 oC di Kebun Raya Bogor dan 27.03oC di hutan CIFOR, diturunkan dari informasi yang direkam sensor thermal. Selanjutnya nilai radiasi gelombang panjang yang dipantulkan permukaan didapatkan dari nilai suhu permukaan dengan menerapkan hukum Stefan Bolzman. Dengan menggunakan informasi nilai radiasi datang, nilai radiasi pantul, nilai radiasi gelombang pendek yang dipantulkan selanjutnya dilakukan perhitungan nilai Radiasi netto dan Nilai radiasi yang diserap dan ditransmisi. Nilai radiasi yang diserap dan ditransmisikan untuk hutan penelitian dan pengembangan kehutanan, Bogor adalah 553.18 W/m2. Nilai radiasi yang diserap dan ditransmisikan kebun raya bogor pada 22 Desember 2001 adalah 552.66 W/m2.
Keyword: Remote sensing, Radiation, Albedo, Electromagnetic wave

Judul: Pendugaan nilai komponen neraca energi di kanopi hutan tanaman agathis loranthifolia dengan menggunakan satelit optik (Studi kasus Hutan Gunung Walat Sukabumi)
Abstrak: The process of absorption, reflection and transmission of radiation at the plant area will cause changes in the spectrum of solar radiation at the top, middle and bottom canopy (June, 1993). Next Odum (1970) suggests that many plants that grow in the shade of other plants which will be the quality of different spectral direct solar radiation, which causes a reduction in the amount of radiation received by the leaf surface compared with those leaves receiving direct solar radiation. This situation has important implications for the plants that grow beneath a thick canopy such as: the plants in the forest floor. This study tries to apply satellite remote sensing techniques and combined with the capture of field data have been processed before by using GLA software (Gap Light Analyzer) to estimate the value of the transmitted radiation by the canopy of plants. Value of net radiation received by the canopy of the forest areas of 51 Wm-2, the value of short-wave radiation reflected by the canopy of the forest areas of 48 Wm-2. The value range of the transmitted radiation calculations using GLA software is for 19% of short-wave radiation coming. This value is the direct radiation into the forest canopy with no obstructed by canopy cover. Determining the value of the transmitted radiation is strongly influenced by the quality of the image so that the required use of digital cameras that have lenses with a high acuity.
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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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