Judul: Analisis dinamika populasi penggerek batang padi kuning (Scirpophaga incertulans) di Tegal menggunakan model Dymex 3.0
Abstrak: Penggerek batang padi kuning atau Scirphopaga incertulans termasuk hama dengan serangan tertinggi di wilayah Tegal. Curah hujan, suhu, dan kelembaban udara merupakan faktor iklim yang mempengaruhi populasi hama ini. Penelitian ini bertujuan untuk menganalisis pengaruh iklim terhadap dinamika populasi hama Penggerek batang padi kuning di Kabupaten Tegal. Pendugaan populasi hama dilakukan selama dua tahun yaitu 2012-2013 menggunakan model simulasi Dymex 3.0. Hasil simulasi populasi model menunjukkan populasi larva tertinggi terjadi pada bulan-bulan kering dengan intensitas hujan rendah. Nilai koefisien determinasi (R²) hasil validasi antara populasi hasil luaran model Dymex dengan hasil observasi sebesar 81.66%. Faktor cuaca yang paling berpengaruh terhadap perkembangan populasi Penggerek batang padi kuning yaitu curah hujan dan suhu.
Keyword: Climate, Dymex, Scirpophaga incertulans, Pengaruh curah hujan, Pengaruh suhu, pengaruh kelembaban

Judul: Analisis Iklim dan Dinamika Populasi Hama Penggerek Batang Padi Kuning di Indramayu dengan Menggunakan Model Simulasi Dymex 3.0
Abstrak: Scirpophaga incertulas known as the Yellow rice stem borer (PBK) is one of the most attacking pests of rice plants in Indramayu region. One of the factors that influence the presence of this pest is the climatic factor, that were rainfall, maximum and minimum temperature, maximum and minimum Relative humadity. The purpose of this study was to analyze the influence of climate on the population dynamics of Yellow rice stem borer in the district of Indramayu. Life cycle model and estimation of pest populations using simulation models Dymex 3.0. Simulations were performed for four years from 2009-2012. Results of simulation models have been able to give a fairly good prediction. Model simulations also indicate that the pest population peaks occurred in the dry months with low rainfall intensity and pest population decreases as a result of high rainfall washed away by rain. This is also supported by the value of the coefficient of determination (R2) between the validation results of outcomes population of model Dymex and observations by 64%. Different climatic influences on the development and the presence of pests PBK. Temperature and rainfall are the most important factor in the progression and mortality of pest PBK
Keyword: Climate, Dymex, Scirpophaga incertulas

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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