Judul: Pendugaan Debit Andalan menggunakan model SWAT di Sungai Kuncir, Kabupaten Nganjuk, Jawa Timur
Abstrak: Sungai Kuncir merupakan saluran drainase primer yang menjadi sumber sarana irigasi di Kabupaten Nganjuk. Potensi Sungai Kuncir dapat dikaji melalui perhitungan debit andalan untuk dijadikan indikator dalam jumlah pemenuhan kebutuhan air pada komunitas wilayah. Penelitian ini bertujuan menerapkan model SWAT dalam pendugaan debit air sungai dan menghitung besar debit andalan pada Sungai Kuncir, Kabupaten Nganjuk. Kegiatan pengambilan data lapang dilakukan di Kabupaten Nganjuk, Jawa Timur khususnya di Sungai Kuncir. Penelitian dilakukan melalui dua tahap, yaitu proses pembangunan model dan proses simulasi dengan SWAT setelah melalui proses kalibrasi dan validasi data. Simulasi model memiliki korelasi yang tinggi dengan nilai NS pada hasil kalibrasi sebesar 0.67 dan debit rata-rata harian hasil simulasi sebesar 7.15 m3 s-1. Skenario perubahan lahan menggambarkan konversi lahan hutan dan semak belukar menjadi lahan pertanian berpotensi meningkatkan nilai debit Sungai Kuncir., Kuncir River is the primary drainage canal that becomes the source of irrigation facilities in Nganjuk district. The potential of Kuncir River can be assessed by measuring the dependable flow to become an indicator of the amount of water supply to the community area. This research aims to apply SWAT model to estimate the river flow and measure the dependable flow in Kuncir River, Nganjuk district. Data was collected from Kuncir River, Nganjuk district, East Java. There are two major steps on this research, model establishment and model simulation using SWAT after data calibration and validation. Model simulation has high correlations with the observed data. It is showed by NS value of 0.67 and mean daily flow of 7.15 m3 s-1. Land use change scenario showed that the conversion of forest and range-grasses into agriculture land potentially increase the flow of Kuncir River.
Keyword: andalan, debit, model, Sungai Kuncir, SWAT

Judul: Pengembangan Model SWAT-Modflow untuk Pendugaan Ketersediaan Airtanah di Kabupaten Nganjuk, Jawa Timur.
Abstrak: Ketersediaan airtanah dipengaruhi oleh interaksi air permukaan dan airtanah dalam siklus hidrologi. Penelitian ini bertujuan untuk menduga ketersediaan airtanah di Kabupaten Nganjuk. Ujicoba modifikasi modul padi pada SWAT juga dilakukan sebagai perbandingan hasil analisis debit harian dengan modul SWAT asli dan SWAT-Modflow. Penelitian dilakukan melalui 3 tahapan besar yaitu pembangunan model SWAT, pembentukan dan simulasi SWAT modul padi, dan integrasi model SWAT MODFLOW. Hasil analisis ketiga model terjadi penurunan debit rerata harian dari 41.152 m3/s pada SWAT, menjadi 41.145 m3/s pada SWAT modul padi dan 38.9 m3/s pada model SWAT-Modflow. Hasil uji statistik NSE dan R2 pada ketiga model juga cukup variatif yaitu untuk SWAT sebesar 0.683 dan 0.693, SWAT modul padi sebesar 0.688 dan 0.693 dan SWAT-Modflow sebesar 0.671 dan 0.690. Analisa elevasi muka airtanah melalui model SWAT-Modflow dilakukan dengan melihat nilai minimum, maksimum dan rata-rata muka airtanah selama 2010 - 2011. Fluktuasi muka airtanah masih belum mampu disimulasikan oleh model SWAT-Modflow dikarenakan keterbatasan model mensimulasikan interaksi groundwater dan surface water.
Keyword: SWAT-Modflow, model, airtanah, elevasi, muka air

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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