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: 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: Sudoku Tereduksi dan Grup Simetri Sudoku
Abstrak: Sudoku is a logic game in form of square games consisting rows, columns and mini grids. In this game, the square is filled by numbers from 1 to . At this game, the player plays the game precisely because each cell in a row or column should have a unique number. The mini grid should have no repeated numbers. This research proves that to determine the number of the isomorphic Sudoku solutions from given Sudoku solutions can be calculated using reduced Sudoku. Sudoku symmetry group is a collection of Sudoku solutions that is experienced symmetry group operations. Symmetry group operation is an operation permutation consisting permutation values, stack permutations, permutations band, column permutations on the stack, or row permutations of the band. The isomorphic Sudoku solutions from reduced Sudoku can be obtained from symmetry group operation imposed on Sudoku reduced. The total possible Sudoku solutions calculated from the number of given reduced Sudoku.
Keyword: sudoku symmetry group, reduced sudoku, isomorphic