Judul: Analysis of Climate and Population Dynamics of White Stem Borer Scirpopagha innotata (Walker) in Sumbawa Regency
Abstrak: Preliminary selection is conducted in order to choose which pest that will be presented in this research. Four consecutive years from 2009 to 2012 is selected as time range to measure rice harvest losses due to infectious pest outbreak. The white stem borer (Scirpophaga innotata) has been one of major pests that cause farmer worries over years in Sumbawa Regency. The climate dynamics as hypothesized one of important factors to drive pest development is the underlying to be concerned. Australia CSIRO’s DYMEX agroclimatic software is employed in constructing a pest dynamics model provided with biological cycle (egg, larva, pupa and adult) with approach using quantitative climate parameter. Therefore, the output will be subject for analysis of white stem borer dynamic population in the regency from 2009 to September 2012. The result shows that fluctuating involved climate parameters give influence on white stem borer development at every stage. Meanwhile heat and cold stress, humid stress, and washing, simultaneously act as limiting factor for each life stage development. Larva stage as deemed the most perilous stage causing rice plant damage, lives within considerably suitable range of temperature (23.8ºC – 31.6ºC), relative humidity (65% - 77%), rainfall (0 mm – 30 mm), thus Sumbawa climate circumstance comforts the pest development. Meanwhile, most intensifying larva infestation occurs on February 2010, September 2011, and September 2012 respectively.
Keyword: Bogor Agricultural University (IPB), Sumbawa Regency, climate dynamics, DYMEX, Scirpophaga innonata

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: Penentuan energi aktivasi ion untuk melewati membran teflon pada berbagai larutan elektrolit
Abstrak: Kaseno (1999) menyatakan bahwa dalam teknologi pemisahan, membran adalah bahan yang dapat memisahkan dua komponen dengan cara yang spesifik yaitu menahan atau melewatkan salah satu komponen lebih cepat dari komponen lainnya. Kemampuan pemisahan yang dimiliki oleh membran untuk melewatkan suatu senyawa kimia atau molekul diakibatkan oleh adanya perbedaan sifat fisika atau kimia antara membran dengan senyawa kimia.
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