Judul: ANALYSIS OF CLIMATE FACTORS ON GROWTH RATE FRUIT caterpillar (Helicoverpa armigera) ON TOMATO PLANTS IN BANDUNG DISTRICT
Abstrak: Helicoverpa armigera merupakan salah satu hama sayuran yang menjadi perhatian baik di daerah tropis maupun sub tropis. Di Indonesia yang merupakan daerah beriklim tropis, H. armigera ditemukan menyerang tanaman tomat sehingga menurunkan produksi buah tomat, salah satunya di Kabupaten Bandung yang merupakan sentra produksi buah tomat setelah Kabupaten Garut. Faktor iklim dapat berpengaruh terhadap potensi distribusi serangan hama H. armigera. Respon hama terhadap parameter iklim dapat ditunjukkan menggunakan model bioklimatik Climex. Maka dari itu, pada penelitian ini, fungsi compare years dari Climex digunakan untuk menjelaskan pengaruh faktor iklim seperti suhu udara, kelembaban udara, dan curah hujan tahun 2012-2021 terhadap tingkat pertumbuhan H. armigera di Kabupaten Bandung. Hasil dari luaran model menunjukkan nilai Ecoclimatic Index (EI) sebesar 38-42 sehingga pertumbuhan dan perkembangan H. armigera kurang sesuai di Kabupaten Bandung untuk setiap tahunnya. Selain itu, nilai koefisien determinasi (R2 ) dari unsur iklim suhu udara, kelembapan udara, dan curah hujan adalah 0,7%; 1,3%; dan 0,8%. Artinya, kelembaban udara memiliki pengaruh yang lebih besar terhadap luas serangan H. armigera dibandingkan faktor iklim lainnya, Helicoverpa armigera is a vegetable pest that is of concern in both tropical and sub-tropical regions. In Indonesia, which is an area with a tropical climate, H. armigera was found to attack tomato plants thereby reducing tomato production, one of which was in Bandung Regency which is the center of tomato fruit production after Garut Regency. Climatic factors can affect the distribution potential of H. armigera pests. Pest response to climate parameters can be demonstrated using the Climex bioclimatic model. Therefore, in this study, the compare years function from Climex was used to explain the influence of climate factors such as air temperature, air humidity, and rainfall in 2012-2021 on the growth rate of H. armigera in Bandung Regency. The results of the model output show an Ecoclimatic Index (EI) value of 38-42 so that the growth and development of H. armigera is not appropriate in Bandung Regency each year. In addition, the value of the coefficient of determination (R2) of the climatic elements of air temperature, air humidity and rainfall is 0.7%; 1.3%; and 0.8%. This means that air humidity has a greater influence on the area of attack of H. armigera compared to other climatic factors.
Keyword: climex, compare years, EI and climate factor

Judul: Climate Suitability On The Spread Of Brown Planthopper (Nilaparvata lugens Stal.) in Cilacap, Central Java Using Climex Model
Abstrak: Padi merupakan komoditas pangan utama di bidang pertanian yang menjadi salah satu makanan pokok bagi penduduk Indonesia. Salah satu kendala dalam meningkatkan produksi padi adalah serangan hama. Wereng batang cokelat (WBC) merupakan hama utama tanaman padi yang mudah beradaptasi di lingkungan baru. Penelitian ini bertujuan menganalisis kesesuaian iklim terhadap potensi hama WBC di Kabupaten Cilacap. Metode yang digunakan dalam penelitian ini adalah analisis regresi parameter iklim terhadap tingkat serangan hama WBC dan indeks ekoklimatik (EI) dengan menggunakan model Climex 4.0. Analisis regresi digunakan untuk melihat faktor iklim mana yang paling berpengaruh terhadap penyebaran WBC. Faktor iklim yang paling berpengaruh terhadap daerah serangan dan populasi WBC adalah kelembaban udara. Hasil analisis dari tahun 2009 hingga 2018 menunjukkan nilai EI sebesar 81 yang menunjukkan kondisi lingkungan di Kabupaten Cilacap cocok untuk perkembangan hama WBC. Hasil analisis menggunakan skenario perubahan iklim RCP 4.5 dan 8.5 pada tahun 2030 dengan model CSIRO menunjukkan nilai EI sebesar 81 dan 87. Sedangkan berdasarkan model MIROC5 menunjukkan nilai EI sebesar 82 dan 84. Hal ini menunjukkan iklim dimasa mendatang cocok untuk perkembangan hama wereng cokelat., Rice is the main food commodity in agriculture which is one of the staple foods for the Indonesian population. One of the obstacles in increasing rice production is pest attack. Brown stem planthopper (WBC) is a major pest of rice plants that is easy to adapt to new environments. This study aims to analyze the suitability of climate to potential WBC pests in Cilacap Regency. The method used in this study is a regression analysis of climate parameters on the level of WBC pest attack and the ecoclimatic index (EI) using the Climex 4.0 model. Regression analysis was used to see which climatic factors had the most influence on the spread of WBC. The most influential climatic factor on the area of attack and the population of WBC is air humidity. The results of the analysis from 2009 to 2018 show an EI value of 81 which indicates the environmental conditions in Cilacap Regency are suitable for the development of WBC pests. The results of the analysis using scenarios of climate changes in RCP 4.5 and 8.5 in 2030 with the CSIRO model show EI values of 81 and 87. Meanwhile, based on the MIROC5 model, EI values of 82 and 84 show that the future climate is suitable for the development of brown planthoppers.
Keyword: climex, perubahan skenario iklim, serangan hama, wereng batang cokelat

Judul: Pervaporasi Alkohol Menggunakan Membran Polistirena-SDS
Abstrak: Polystyrene (PS) membrane with SDS as porogen can be utilized as a filter in alcohol pervaporation process. The membrane was prepared using inversed phase method with PS:SDS:dichloromethane solvent composition were 17:0:83; 17:0.5:82.5; 17:1:82; 17:1.5:81.5; and 17:2:81. Homogenization of mixtures were carried out for 10 and 20 hours and casted on glass plate surface then submerged it into water with temperature of 60 °C. Pervaporation capability was evaluated from flux value and separation factor. The average of water flux values in 20 hours sonication were higher than the values in 10 hours sonication. The highest separation factor was observed in PS membrane with 0.5% SDS concentration and homogenization in 20 hours is 5.23. Application of PS membrane in pervaporation as showed by purities of alcohol value using gas chromatography method revealed that the purities increase from 91.6 to 93.4%. Therefore, certain SDS addition can increase the performance of PS membrane in alcohol purification.
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