Judul: Analisis Pengaruh Faktor Iklim Terhadap Tingkat Serangan Hama Wereng Cokelat (Studi Kasus: Kabupaten Karawang)
Abstrak: Brown Planthopper (Nilaparvata lugens Stal) is one of the limiting factors that cause decline in rice production. Based on existing data, the highest level of infestation occurred in 1998 in three areas of West Java, namely Karawang, Subang, and Indramayu at a total of 40.000 ha. The purpose of this study was to determine the effect of climatic elements on the level of infestation by brown planthopper on rice plantation in Karawang Regency. Climatic elements are used as the independent variable (x) and area infested by brown planthopper as the dependent variable (Y). A quadratic regression and multiple regression were used for the analysis. Quadratic regression analysis is used to express the relationship between the area infested and the climatic elements. Multiple linear regression analysis was performed to obtain the relationship of five climatic factors, namely the maximum temperature, minimum temperature, average temperature, humidity, and rainfall as a whole against area infested by brown planthopper. Climatic element that had the most influence was the minimum temperature with the value of the coefficient of determination (R2 = 17.6%) and with the regression equation of LS = - 8276 + Tm 797.6 - 18.69 TM2. The equation obtained from multiple regression analysis was LS = 905 - 28.0 Tr - 0:12 RH + CH 0210, with R2 = 7.2 %. These results suggested that there was a weak relationship between the area of infestation and the climatic elements.
Keyword: 

Judul: Analisis Fakor Iklim terhadap Penyebaran Hama Wereng Batang Coklat (Nilaparvata lugens Stal.) pada Tanaman Padi di Kabupaten Cianjur
Abstrak: Penelitian ini bertujuan menganalisis pengaruh faktor iklim terhadap penyebaran hama wereng batang coklat (Nilaparvata lugens Stal) pada tanaman padi di Kabupaten Cianjur menggunakan Climex 4.0. Model Climex 4.0 dapat digunakan untuk menganalisis penyebaran hama wereng batang coklat terhadap pengaruh faktor iklim. Pertumbuhan hama wereng batang coklat dapat dipresentasikan menggunakan Indeks Ekoklimatik (EI). EI dihasilkan dari compare location dan compare years untuk membandingkan tingkat kesesuaian hama wereng batang coklat. Tahun 2008-2017 terjadi periode yang sesuai untuk perkembangan hama wereng batang coklat. Pertumbuhan dan perkembangan hama wereng batang coklat (Nilaparvata lugens Stal) sangat sesuai dengan karakteristik iklim di wilayah Kabupaten Cianjur. Adapun nilai indeks ekoklimatik yang diperoleh di Kabupaten Cianjur sebesar 67, hal tersebut menunujukkan bahwa potensi hama wereng batang coklat dapat hidup dan berkembang dengan baik. Tahun 2011 merupakan nilai indeks ekoklimatik tertinggi sebesar 79 dan tahun 2013 merupakan nilai indeks ekoklimatik paling rendah di Cianjur yaitu sebesar 56. Faktor iklim yang sangat mempengaruhi serangan hama wereng batang coklat adalah curah hujan., This study aims to analyze the effect of climatic factors on the spread of the brown planthopper (Nilaparvata lugens Stal) on rice plants in Cianjur Regency using Climex 4.0. The Climex 4.0 model can be used to analyze the spread of the brown plant hopper against the influence of climatic factors. The growth of the brown planthopper can be represented using the Ecoclimatic Index (EI). EI is generated from compare location and compare years to compare the suitability of brown planthopper pests. The year 2008-2017 was an appropriate period for the development of the brown planthopper. The growth and development of the brown plant hopper (Nilaparvata lugens Stal) is in accordance with the climatic characteristics of the Cianjur Regency. The ecoclimatic index value obtained in Cianjur Regency is 67, it shows that the potential for brown planthopper pests can live and develop well. The year 2011 was the highest ecoclimatic index value of 79 and 2013 was the lowest ecoclimatic index value in Cianjur, which was 56. Climatic factors that greatly affect the attack of brown planthopper pests are rainfall.
Keyword: climex 4.0, hama wereng batang coklat, indeks ekoklimatik, potensi luas serangan

Judul: Membran Komposit Kitosan-Zeolit untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: Direct methanol fuel cell (DMFC) is a fuel cell that utilize methanol as the fuel source. The electrolyte membrane used in the DMFC system in this research was chitosan-zeolite composite membrane. The composite membrane was synthesized with chitosan-zeolite composition variation of 1:1, 1:2, 1:3, and 2:1. The membranes were analyzed by Fourier transform infrared spectrophotometer (FTIR) and scanning electron microscope, and for the specific gravity. Membrane performances were tested with methanol uptake, methanol permeability, conductivity, and potential difference in the DMFC system. The FTIR spectrum showed no formation of new functional groups inducating that the composite membrane was a result of physical mixing. Morphological analysis showed that the membrane was nonporous. Chitosan-zeolite 1:3 composite membrane had the highest specific gravity and methanol uptake, 1.4226 g/mL and 41.44%, respectively. The highest proton conductivity was showed by the 1:2 chitosanzeolite composite membrane, namely 7.2946× 10-7 S/cm. Based on this research results, chitosan-zeolite composite membrane can be applied in DMFC system.
Keyword: